From 40a39381063fdd83c4cbf5eacebfc50a2201308b Mon Sep 17 00:00:00 2001 From: Martin Liska Date: Sun, 13 Nov 2022 21:59:20 +0100 Subject: [PATCH] Revert "sphinx: jit: port libgccjit to shared Sphinx" This reverts commit 94246daa3efba88d4ae6619f24d737c01ba3dc89. --- gcc/jit/Make-lang.in | 50 +- gcc/jit/doc/conf.py | 30 - gcc/jit/docs/Makefile | 153 + gcc/jit/docs/_build/texinfo/Makefile | 57 + .../texinfo/libgccjit-figures}/factorial.png | Bin .../texinfo/libgccjit-figures/factorial1.png | Bin 0 -> 183838 bytes .../libgccjit-figures}/sum-of-squares.png | Bin .../libgccjit-figures/sum-of-squares1.png | Bin 0 -> 22839 bytes gcc/jit/docs/_build/texinfo/libgccjit.texi | 16569 ++++++++++++++++ gcc/jit/docs/conf.py | 261 + gcc/jit/{doc => docs}/cp/index.rst | 0 gcc/jit/{doc => docs}/cp/intro/index.rst | 0 gcc/jit/{doc => docs}/cp/intro/tutorial01.rst | 0 gcc/jit/{doc => docs}/cp/intro/tutorial02.rst | 0 gcc/jit/{doc => docs}/cp/intro/tutorial03.rst | 2 +- gcc/jit/{doc => docs}/cp/intro/tutorial04.rst | 0 gcc/jit/{doc => docs}/cp/topics/asm.rst | 0 .../{doc => docs}/cp/topics/compilation.rst | 0 gcc/jit/{doc => docs}/cp/topics/contexts.rst | 0 .../{doc => docs}/cp/topics/expressions.rst | 0 gcc/jit/{doc => docs}/cp/topics/functions.rst | 0 gcc/jit/{doc => docs}/cp/topics/index.rst | 0 gcc/jit/{doc => docs}/cp/topics/locations.rst | 0 gcc/jit/{doc => docs}/cp/topics/objects.rst | 0 gcc/jit/{doc => docs}/cp/topics/types.rst | 0 .../{doc => docs}/examples/emit-alphabet.bf | 0 .../examples/tut01-hello-world.c | 0 .../examples/tut01-hello-world.cc | 0 gcc/jit/{doc => docs}/examples/tut02-square.c | 0 .../{doc => docs}/examples/tut02-square.cc | 0 .../examples/tut03-sum-of-squares.c | 0 .../examples/tut03-sum-of-squares.cc | 0 .../examples/tut04-toyvm/Makefile | 0 .../examples/tut04-toyvm/factorial.toy | 0 .../examples/tut04-toyvm/fibonacci.toy | 0 .../examples/tut04-toyvm/toyvm.c | 0 .../examples/tut04-toyvm/toyvm.cc | 0 gcc/jit/{doc => docs}/examples/tut05-bf.c | 0 gcc/jit/{doc => docs}/index.rst | 0 gcc/jit/{doc => docs}/internals/index.rst | 0 .../internals/test-hello-world.exe.log.txt | 0 gcc/jit/docs/intro/factorial.png | Bin 0 -> 183838 bytes gcc/jit/{doc => docs}/intro/index.rst | 0 gcc/jit/docs/intro/sum-of-squares.png | Bin 0 -> 22839 bytes gcc/jit/{doc => docs}/intro/tutorial01.rst | 0 gcc/jit/{doc => docs}/intro/tutorial02.rst | 0 gcc/jit/{doc => docs}/intro/tutorial03.rst | 2 +- gcc/jit/{doc => docs}/intro/tutorial04.rst | 0 gcc/jit/{doc => docs}/intro/tutorial05.rst | 0 gcc/jit/{doc => docs}/topics/asm.rst | 0 .../{doc => docs}/topics/compatibility.rst | 0 gcc/jit/{doc => docs}/topics/compilation.rst | 0 gcc/jit/{doc => docs}/topics/contexts.rst | 0 gcc/jit/{doc => docs}/topics/expressions.rst | 0 .../topics/function-pointers.rst | 0 gcc/jit/{doc => docs}/topics/functions.rst | 0 gcc/jit/{doc => docs}/topics/index.rst | 0 gcc/jit/{doc => docs}/topics/locations.rst | 0 gcc/jit/{doc => docs}/topics/objects.rst | 0 gcc/jit/{doc => docs}/topics/performance.rst | 0 gcc/jit/{doc => docs}/topics/types.rst | 0 61 files changed, 17067 insertions(+), 57 deletions(-) delete mode 100644 gcc/jit/doc/conf.py create mode 100644 gcc/jit/docs/Makefile create mode 100644 gcc/jit/docs/_build/texinfo/Makefile rename gcc/jit/{doc/intro => docs/_build/texinfo/libgccjit-figures}/factorial.png (100%) create mode 100644 gcc/jit/docs/_build/texinfo/libgccjit-figures/factorial1.png rename gcc/jit/{doc/intro => docs/_build/texinfo/libgccjit-figures}/sum-of-squares.png (100%) create mode 100644 gcc/jit/docs/_build/texinfo/libgccjit-figures/sum-of-squares1.png create mode 100644 gcc/jit/docs/_build/texinfo/libgccjit.texi create mode 100644 gcc/jit/docs/conf.py rename gcc/jit/{doc => docs}/cp/index.rst (100%) rename gcc/jit/{doc => docs}/cp/intro/index.rst (100%) rename gcc/jit/{doc => docs}/cp/intro/tutorial01.rst (100%) rename gcc/jit/{doc => docs}/cp/intro/tutorial02.rst (100%) rename gcc/jit/{doc => docs}/cp/intro/tutorial03.rst (99%) rename gcc/jit/{doc => docs}/cp/intro/tutorial04.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/asm.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/compilation.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/contexts.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/expressions.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/functions.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/index.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/locations.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/objects.rst (100%) rename gcc/jit/{doc => docs}/cp/topics/types.rst (100%) rename gcc/jit/{doc => docs}/examples/emit-alphabet.bf (100%) rename gcc/jit/{doc => docs}/examples/tut01-hello-world.c (100%) rename gcc/jit/{doc => docs}/examples/tut01-hello-world.cc (100%) rename gcc/jit/{doc => docs}/examples/tut02-square.c (100%) rename gcc/jit/{doc => docs}/examples/tut02-square.cc (100%) rename gcc/jit/{doc => docs}/examples/tut03-sum-of-squares.c (100%) rename gcc/jit/{doc => docs}/examples/tut03-sum-of-squares.cc (100%) rename gcc/jit/{doc => docs}/examples/tut04-toyvm/Makefile (100%) rename gcc/jit/{doc => docs}/examples/tut04-toyvm/factorial.toy (100%) rename gcc/jit/{doc => docs}/examples/tut04-toyvm/fibonacci.toy (100%) rename gcc/jit/{doc => docs}/examples/tut04-toyvm/toyvm.c (100%) rename gcc/jit/{doc => docs}/examples/tut04-toyvm/toyvm.cc (100%) rename gcc/jit/{doc => docs}/examples/tut05-bf.c (100%) rename gcc/jit/{doc => docs}/index.rst (100%) rename gcc/jit/{doc => docs}/internals/index.rst (100%) rename gcc/jit/{doc => docs}/internals/test-hello-world.exe.log.txt (100%) create mode 100644 gcc/jit/docs/intro/factorial.png rename gcc/jit/{doc => docs}/intro/index.rst (100%) create mode 100644 gcc/jit/docs/intro/sum-of-squares.png rename gcc/jit/{doc => docs}/intro/tutorial01.rst (100%) rename gcc/jit/{doc => docs}/intro/tutorial02.rst (100%) rename gcc/jit/{doc => docs}/intro/tutorial03.rst (99%) rename gcc/jit/{doc => docs}/intro/tutorial04.rst (100%) rename gcc/jit/{doc => docs}/intro/tutorial05.rst (100%) rename gcc/jit/{doc => docs}/topics/asm.rst (100%) rename gcc/jit/{doc => docs}/topics/compatibility.rst (100%) rename gcc/jit/{doc => docs}/topics/compilation.rst (100%) rename gcc/jit/{doc => docs}/topics/contexts.rst (100%) rename gcc/jit/{doc => docs}/topics/expressions.rst (100%) rename gcc/jit/{doc => docs}/topics/function-pointers.rst (100%) rename gcc/jit/{doc => docs}/topics/functions.rst (100%) rename gcc/jit/{doc => docs}/topics/index.rst (100%) rename gcc/jit/{doc => docs}/topics/locations.rst (100%) rename gcc/jit/{doc => docs}/topics/objects.rst (100%) rename gcc/jit/{doc => docs}/topics/performance.rst (100%) rename gcc/jit/{doc => docs}/topics/types.rst (100%) diff --git a/gcc/jit/Make-lang.in b/gcc/jit/Make-lang.in index a9aee905f2c9..248ec45b7295 100644 --- a/gcc/jit/Make-lang.in +++ b/gcc/jit/Make-lang.in @@ -233,31 +233,39 @@ jit.rest.encap: # These targets redirect HTML creation and installation to either # jit.sphinx.(install-)html or jit.texinfo.(install-)html. -jit.html: doc/libgccjit/html/html/index.html +jit.html: jit.$(doc_build_sys).html jit.install-html: jit.$(doc_build_sys).install-html # For now, use texinfo for pdf, since the sphinx latex toolchain currently # fails for me deep inside pdflatex (see notes below) -jit.pdf: doc/libgccjit/pdf/latex/libgccjit.pdf +jit.pdf: jit.texinfo.pdf jit.install-pdf: jit.texinfo.install-pdf -jit.info: doc/libgccjit/info/texinfo/libgccjit.info +# Hooks for building docs using texinfo +JIT_TEXI_FILES = $(srcdir)/jit/docs/_build/texinfo/libgccjit.texi -doc/libgccjit/info/texinfo/libgccjit.info: $(SPHINX_FILES) - + if [ x$(SPHINX_BUILD) = xsphinx-build ]; then \ - make -C $(srcdir)/../doc info SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/info; \ +jit.info: doc/libgccjit.info +doc/libgccjit.info: $(JIT_TEXI_FILES) + if test "x$(BUILD_INFO)" = xinfo; then \ + rm -f doc/libgccjit.info*; \ + $(MAKEINFO) $(MAKEINFOFLAGS) -I $(gcc_docdir) \ + -I $(gcc_docdir)/include -o $@ $<; \ else true; fi jit.install-info: $(DESTDIR)$(infodir)/libgccjit.info -$(DESTDIR)$(infodir)/libgccjit.info: doc/libgccjit/info/texinfo/libgccjit.info installdirs - -rm -f $@ - -$(INSTALL_DATA) $< $@ +jit.dvi: doc/libgccjit.dvi +doc/libgccjit.dvi: $(JIT_TEXI_FILES) + $(TEXI2DVI) -I $(abs_docdir) -I $(abs_docdir)/include -o $@ $< -doc/libgccjit/html/html/index.html: $(SPHINX_FILES) - + make -C $(srcdir)/../doc html SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/html +jit.texinfo.html: $(build_htmldir)/jit/index.html -jit.texinfo.install-html: doc/libgccjit/html/html/index.html +$(build_htmldir)/jit/index.html: $(srcdir)/jit/docs/_build/texinfo/libgccjit.texi + $(mkinstalldirs) $(@D) + rm -f $(@D)/* + $(TEXI2HTML) -I $(gcc_docdir)/include -I $(srcdir)/jit -o $(@D) $< + +jit.texinfo.install-html: jit.texinfo.html @$(NORMAL_INSTALL) test -z "$(htmldir)" || $(mkinstalldirs) "$(DESTDIR)$(htmldir)" @for p in $(build_htmldir)/jit; do \ @@ -274,9 +282,10 @@ jit.texinfo.install-html: doc/libgccjit/html/html/index.html fi; \ done +jit.texinfo.pdf: doc/libgccjit.pdf -doc/libgccjit/pdf/latex/libgccjit.pdf: $(SPHINX_FILES) - + make -C $(srcdir)/../doc latexpdf SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/pdf +doc/libgccjit.pdf: $(JIT_TEXI_FILES) + $(TEXI2PDF) -I $(abs_docdir) -I $(abs_docdir)/include -o $@ $< jit.texinfo.install-pdf: doc/libgccjit.pdf @$(NORMAL_INSTALL) @@ -333,10 +342,7 @@ jit.srcextra: jit.tags: -jit.man: doc/libgccjit/man/man/libgccjit.1 - -doc/libgccjit/man/man/libgccjit.1: $(SPHINX_FILES) - + make -C $(srcdir)/../doc man SOURCEDIR=$(abs_srcdir)/jit/doc/ BUILDDIR=$(objdir)/doc/libgccjit/man +jit.man: jit.srcman: @@ -391,13 +397,7 @@ jit.install-common: installdirs jit.install-headers endif endif -jit.install-man: $(DESTDIR)$(man1dir)/libgccjit$(man1ext) - -$(DESTDIR)$(man1dir)/libgccjit$(man1ext): doc/libgccjit/man/man/libgccjit.1 \ - installdirs - -rm -f $@ - -$(INSTALL_DATA) $< $@ - -chmod a-x $@ +jit.install-man: jit.install-plugin: diff --git a/gcc/jit/doc/conf.py b/gcc/jit/doc/conf.py deleted file mode 100644 index 580fa2805702..000000000000 --- a/gcc/jit/doc/conf.py +++ /dev/null @@ -1,30 +0,0 @@ -# Configuration file for the Sphinx documentation builder. - -import sys -sys.path.append('../../..//doc') - -from baseconf import * - -name = 'libgccjit' -project = 'libgccjit' -copyright = '1987-%s Free Software Foundation, Inc.' % YEAR -authors = 'David Malcolm' - -# Grouping the document tree into Texinfo files. List of tuples -# (source start file, target name, title, author, -# dir menu entry, description, category) -latex_documents = [ - ('index', f'{name}.tex', project, authors, 'manual'), -] - -# One entry per manual page. List of tuples -# (source start file, name, description, authors, manual section). -man_pages = [ - ('index', name, project, [authors], 1), -] - -texinfo_documents = [ - ('index', name, project, authors, None, None, None, True) -] - -set_common(name, globals()) diff --git a/gcc/jit/docs/Makefile b/gcc/jit/docs/Makefile new file mode 100644 index 000000000000..7d20702455a2 --- /dev/null +++ b/gcc/jit/docs/Makefile @@ -0,0 +1,153 @@ +# Makefile for Sphinx documentation +# + +# You can set these variables from the command line. +SPHINXOPTS = +SPHINXBUILD = sphinx-build +PAPER = +BUILDDIR = _build + +# Internal variables. +PAPEROPT_a4 = -D latex_paper_size=a4 +PAPEROPT_letter = -D latex_paper_size=letter +ALLSPHINXOPTS = -d $(BUILDDIR)/doctrees $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) . +# the i18n builder cannot share the environment and doctrees with the others +I18NSPHINXOPTS = $(PAPEROPT_$(PAPER)) $(SPHINXOPTS) . + +.PHONY: help clean html dirhtml singlehtml pickle json htmlhelp qthelp devhelp epub latex latexpdf text man changes linkcheck doctest gettext + +help: + @echo "Please use \`make ' where is one of" + @echo " html to make standalone HTML files" + @echo " dirhtml to make HTML files named index.html in directories" + @echo " singlehtml to make a single large HTML file" + @echo " pickle to make pickle files" + @echo " json to make JSON files" + @echo " htmlhelp to make HTML files and a HTML help project" + @echo " qthelp to make HTML files and a qthelp project" + @echo " devhelp to make HTML files and a Devhelp project" + @echo " epub to make an epub" + @echo " latex to make LaTeX files, you can set PAPER=a4 or PAPER=letter" + @echo " latexpdf to make LaTeX files and run them through pdflatex" + @echo " text to make text files" + @echo " man to make manual pages" + @echo " texinfo to make Texinfo files" + @echo " info to make Texinfo files and run them through makeinfo" + @echo " gettext to make PO message catalogs" + @echo " changes to make an overview of all changed/added/deprecated items" + @echo " linkcheck to check all external links for integrity" + @echo " doctest to run all doctests embedded in the documentation (if enabled)" + +clean: + -rm -rf $(BUILDDIR)/* + +html: + $(SPHINXBUILD) -b html $(ALLSPHINXOPTS) $(BUILDDIR)/html + @echo + @echo "Build finished. The HTML pages are in $(BUILDDIR)/html." + +dirhtml: + $(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml + @echo + @echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml." + +singlehtml: + $(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml + @echo + @echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml." + +pickle: + $(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle + @echo + @echo "Build finished; now you can process the pickle files." + +json: + $(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json + @echo + @echo "Build finished; now you can process the JSON files." + +htmlhelp: + $(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp + @echo + @echo "Build finished; now you can run HTML Help Workshop with the" \ + ".hhp project file in $(BUILDDIR)/htmlhelp." + +qthelp: + $(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp + @echo + @echo "Build finished; now you can run "qcollectiongenerator" with the" \ + ".qhcp project file in $(BUILDDIR)/qthelp, like this:" + @echo "# qcollectiongenerator $(BUILDDIR)/qthelp/libgccjit.qhcp" + @echo "To view the help file:" + @echo "# assistant -collectionFile $(BUILDDIR)/qthelp/libgccjit.qhc" + +devhelp: + $(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp + @echo + @echo "Build finished." + @echo "To view the help file:" + @echo "# mkdir -p $$HOME/.local/share/devhelp/libgccjit" + @echo "# ln -s $(BUILDDIR)/devhelp $$HOME/.local/share/devhelp/libgccjit" + @echo "# devhelp" + +epub: + $(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub + @echo + @echo "Build finished. The epub file is in $(BUILDDIR)/epub." + +latex: + $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex + @echo + @echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex." + @echo "Run \`make' in that directory to run these through (pdf)latex" \ + "(use \`make latexpdf' here to do that automatically)." + +latexpdf: + $(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex + @echo "Running LaTeX files through pdflatex..." + $(MAKE) -C $(BUILDDIR)/latex all-pdf + @echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex." + +text: + $(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text + @echo + @echo "Build finished. The text files are in $(BUILDDIR)/text." + +man: + $(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man + @echo + @echo "Build finished. The manual pages are in $(BUILDDIR)/man." + +texinfo: + $(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo + @echo + @echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo." + @echo "Run \`make' in that directory to run these through makeinfo" \ + "(use \`make info' here to do that automatically)." + +info: + $(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo + @echo "Running Texinfo files through makeinfo..." + make -C $(BUILDDIR)/texinfo info + @echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo." + +gettext: + $(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale + @echo + @echo "Build finished. The message catalogs are in $(BUILDDIR)/locale." + +changes: + $(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes + @echo + @echo "The overview file is in $(BUILDDIR)/changes." + +linkcheck: + $(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck + @echo + @echo "Link check complete; look for any errors in the above output " \ + "or in $(BUILDDIR)/linkcheck/output.txt." + +doctest: + $(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest + @echo "Testing of doctests in the sources finished, look at the " \ + "results in $(BUILDDIR)/doctest/output.txt." diff --git a/gcc/jit/docs/_build/texinfo/Makefile b/gcc/jit/docs/_build/texinfo/Makefile new file mode 100644 index 000000000000..e3b732cda78a --- /dev/null +++ b/gcc/jit/docs/_build/texinfo/Makefile @@ -0,0 +1,57 @@ +# Makefile for Sphinx Texinfo output + +infodir ?= /usr/share/info + +MAKEINFO = makeinfo --no-split +MAKEINFO_html = makeinfo --no-split --html +MAKEINFO_plaintext = makeinfo --no-split --plaintext +TEXI2PDF = texi2pdf --batch --expand +INSTALL_INFO = install-info + +ALLDOCS = $(basename $(wildcard *.texi)) + +all: info +info: $(addsuffix .info,$(ALLDOCS)) +plaintext: $(addsuffix .txt,$(ALLDOCS)) +html: $(addsuffix .html,$(ALLDOCS)) +pdf: $(addsuffix .pdf,$(ALLDOCS)) + +install-info: info + for f in *.info; do \ + mkdir -p $(infodir) && \ + cp "$$f" $(infodir) && \ + $(INSTALL_INFO) --info-dir=$(infodir) "$$f" && \ + \ + FIGURE_DIR="`basename \"$$f\" .info`-figures" && \ + if [ -e "$$FIGURE_DIR" ]; then \ + cp -r "$$FIGURE_DIR" $(infodir) ; \ + fi; \ + done + +uninstall-info: info + for f in *.info; do \ + rm -f "$(infodir)/$$f" ; \ + rm -rf "$(infodir)/`basename '$$f' .info`-figures" && \ + $(INSTALL_INFO) --delete --info-dir=$(infodir) "$$f" ; \ + done + +%.info: %.texi + $(MAKEINFO) -o '$@' '$<' + +%.txt: %.texi + $(MAKEINFO_plaintext) -o '$@' '$<' + +%.html: %.texi + $(MAKEINFO_html) -o '$@' '$<' + +%.pdf: %.texi + -$(TEXI2PDF) '$<' + -$(TEXI2PDF) '$<' + 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+@settitle libgccjit Documentation +@defindex ge +@paragraphindent 0 +@exampleindent 4 +@finalout +@dircategory Miscellaneous +@direntry +* libgccjit: (libgccjit.info). GCC-based Just In Time compiler library. +@end direntry + +@definfoenclose strong,`,' +@definfoenclose emph,`,' +@c %**end of header + +@copying +@quotation +libgccjit 12.0.1 (experimental 20220411), Apr 12, 2022 + +David Malcolm + +Copyright @copyright{} 2014-2022 Free Software Foundation, Inc. +@end quotation + +@end copying + +@titlepage +@title libgccjit Documentation +@insertcopying +@end titlepage +@contents + +@c %** start of user preamble + +@c %** end of user preamble + +@ifnottex +@node Top +@top libgccjit Documentation +@insertcopying +@end ifnottex + +@c %**start of body +@anchor{index doc}@anchor{0} +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +This document describes libgccjit@footnote{https://gcc.gnu.org/wiki/JIT}, an API +for embedding GCC inside programs and libraries. + +There are actually two APIs for the library: + + +@itemize * + +@item +a pure C API: @code{libgccjit.h} + +@item +a C++ wrapper API: @code{libgccjit++.h}. This is a collection of “thin” +wrapper classes around the C API, to save typing. +@end itemize + +Contents: + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Tutorial:: +* Topic Reference:: +* C++ bindings for libgccjit:: +* Internals:: +* Indices and tables:: +* Index:: + +@detailmenu + --- The Detailed Node Listing --- + +Tutorial + +* Tutorial part 1; “Hello world”: Tutorial part 1 “Hello world”. +* Tutorial part 2; Creating a trivial machine code function: Tutorial part 2 Creating a trivial machine code function. +* Tutorial part 3; Loops and variables: Tutorial part 3 Loops and variables. +* Tutorial part 4; Adding JIT-compilation to a toy interpreter: Tutorial part 4 Adding JIT-compilation to a toy interpreter. +* Tutorial part 5; Implementing an Ahead-of-Time compiler: Tutorial part 5 Implementing an Ahead-of-Time compiler. + +Tutorial part 2: Creating a trivial machine code function + +* Error-handling:: +* Options:: +* Full example:: + +Tutorial part 3: Loops and variables + +* Expressions; lvalues and rvalues: Expressions lvalues and rvalues. +* Control flow:: +* Visualizing the control flow graph:: +* Full example: Full example<2>. + +Tutorial part 4: Adding JIT-compilation to a toy interpreter + +* Our toy interpreter:: +* Compiling to machine code:: +* Setting things up:: +* Populating the function:: +* Verifying the control flow graph:: +* Compiling the context:: +* Single-stepping through the generated code:: +* Examining the generated code:: +* Putting it all together:: +* Behind the curtain; How does our code get optimized?: Behind the curtain How does our code get optimized?. + +Behind the curtain: How does our code get optimized? + +* Optimizing away stack manipulation:: +* Elimination of tail recursion:: + +Tutorial part 5: Implementing an Ahead-of-Time compiler + +* The “brainf” language:: +* Converting a brainf script to libgccjit IR:: +* Compiling a context to a file:: +* Other forms of ahead-of-time-compilation:: + +Topic Reference + +* Compilation contexts:: +* Objects:: +* Types:: +* Expressions:: +* Creating and using functions:: +* Function pointers: Function pointers<2>. +* Source Locations:: +* Compiling a context:: +* ABI and API compatibility:: +* Performance:: +* Using Assembly Language with libgccjit:: + +Compilation contexts + +* Lifetime-management:: +* Thread-safety:: +* Error-handling: Error-handling<2>. +* Debugging:: +* Options: Options<2>. + +Options + +* String Options:: +* Boolean options:: +* Integer options:: +* Additional command-line options:: + +Types + +* Standard types:: +* Pointers@comma{} const@comma{} and volatile: Pointers const and volatile. +* Vector types:: +* Structures and unions:: +* Function pointer types:: +* Reflection API:: + +Expressions + +* Rvalues:: +* Lvalues:: +* Working with pointers@comma{} structs and unions: Working with pointers structs and unions. + +Rvalues + +* Simple expressions:: +* Constructor expressions:: +* Vector expressions:: +* Unary Operations:: +* Binary Operations:: +* Comparisons:: +* Function calls:: +* Function pointers:: +* Type-coercion:: + +Lvalues + +* Global variables:: + +Creating and using functions + +* Params:: +* Functions:: +* Blocks:: +* Statements:: + +Source Locations + +* Faking it:: + +Compiling a context + +* In-memory compilation:: +* Ahead-of-time compilation:: + +ABI and API compatibility + +* Programmatically checking version:: +* ABI symbol tags:: + +ABI symbol tags + +* LIBGCCJIT_ABI_0:: +* LIBGCCJIT_ABI_1:: +* LIBGCCJIT_ABI_2:: +* LIBGCCJIT_ABI_3:: +* LIBGCCJIT_ABI_4:: +* LIBGCCJIT_ABI_5:: +* LIBGCCJIT_ABI_6:: +* LIBGCCJIT_ABI_7:: +* LIBGCCJIT_ABI_8:: +* LIBGCCJIT_ABI_9:: +* LIBGCCJIT_ABI_10:: +* LIBGCCJIT_ABI_11:: +* LIBGCCJIT_ABI_12:: +* LIBGCCJIT_ABI_13:: +* LIBGCCJIT_ABI_14:: +* LIBGCCJIT_ABI_15:: +* LIBGCCJIT_ABI_16:: +* LIBGCCJIT_ABI_17:: +* LIBGCCJIT_ABI_18:: +* LIBGCCJIT_ABI_19:: +* LIBGCCJIT_ABI_20:: +* LIBGCCJIT_ABI_21:: +* LIBGCCJIT_ABI_22:: +* LIBGCCJIT_ABI_23:: +* LIBGCCJIT_ABI_24:: + +Performance + +* The timing API:: + +Using Assembly Language with libgccjit + +* Adding assembler instructions within a function:: +* Adding top-level assembler statements:: + +C++ bindings for libgccjit + +* Tutorial: Tutorial<2>. +* Topic Reference: Topic Reference<2>. + +Tutorial + +* Tutorial part 1; “Hello world”: Tutorial part 1 “Hello world”<2>. +* Tutorial part 2; Creating a trivial machine code function: Tutorial part 2 Creating a trivial machine code function<2>. +* Tutorial part 3; Loops and variables: Tutorial part 3 Loops and variables<2>. +* Tutorial part 4; Adding JIT-compilation to a toy interpreter: Tutorial part 4 Adding JIT-compilation to a toy interpreter<2>. + +Tutorial part 2: Creating a trivial machine code function + +* Options: Options<3>. +* Full example: Full example<3>. + +Tutorial part 3: Loops and variables + +* Expressions; lvalues and rvalues: Expressions lvalues and rvalues<2>. +* Control flow: Control flow<2>. +* Visualizing the control flow graph: Visualizing the control flow graph<2>. +* Full example: Full example<4>. + +Tutorial part 4: Adding JIT-compilation to a toy interpreter + +* Our toy interpreter: Our toy interpreter<2>. +* Compiling to machine code: Compiling to machine code<2>. +* Setting things up: Setting things up<2>. +* Populating the function: Populating the function<2>. +* Verifying the control flow graph: Verifying the control flow graph<2>. +* Compiling the context: Compiling the context<2>. +* Single-stepping through the generated code: Single-stepping through the generated code<2>. +* Examining the generated code: Examining the generated code<2>. +* Putting it all together: Putting it all together<2>. +* Behind the curtain; How does our code get optimized?: Behind the curtain How does our code get optimized?<2>. + +Behind the curtain: How does our code get optimized? + +* Optimizing away stack manipulation: Optimizing away stack manipulation<2>. +* Elimination of tail recursion: Elimination of tail recursion<2>. + +Topic Reference + +* Compilation contexts: Compilation contexts<2>. +* Objects: Objects<2>. +* Types: Types<2>. +* Expressions: Expressions<2>. +* Creating and using functions: Creating and using functions<2>. +* Source Locations: Source Locations<2>. +* Compiling a context: Compiling a context<2>. +* Using Assembly Language with libgccjit++:: + +Compilation contexts + +* Lifetime-management: Lifetime-management<2>. +* Thread-safety: Thread-safety<2>. +* Error-handling: Error-handling<3>. +* Debugging: Debugging<2>. +* Options: Options<4>. + +Options + +* String Options: String Options<2>. +* Boolean options: Boolean options<2>. +* Integer options: Integer options<2>. +* Additional command-line options: Additional command-line options<2>. + +Types + +* Standard types: Standard types<2>. +* Pointers@comma{} const@comma{} and volatile: Pointers const and volatile<2>. +* Vector types: Vector types<2>. +* Structures and unions: Structures and unions<2>. + +Expressions + +* Rvalues: Rvalues<2>. +* Lvalues: Lvalues<2>. +* Working with pointers@comma{} structs and unions: Working with pointers structs and unions<2>. + +Rvalues + +* Simple expressions: Simple expressions<2>. +* Vector expressions: Vector expressions<2>. +* Unary Operations: Unary Operations<2>. +* Binary Operations: Binary Operations<2>. +* Comparisons: Comparisons<2>. +* Function calls: Function calls<2>. +* Function pointers: Function pointers<3>. +* Type-coercion: Type-coercion<2>. + +Lvalues + +* Global variables: Global variables<2>. + +Creating and using functions + +* Params: Params<2>. +* Functions: Functions<2>. +* Blocks: Blocks<2>. +* Statements: Statements<2>. + +Source Locations + +* Faking it: Faking it<2>. + +Compiling a context + +* In-memory compilation: In-memory compilation<2>. +* Ahead-of-time compilation: Ahead-of-time compilation<2>. + +Using Assembly Language with libgccjit++ + +* Adding assembler instructions within a function: Adding assembler instructions within a function<2>. +* Adding top-level assembler statements: Adding top-level assembler statements<2>. + +Internals + +* Working on the JIT library:: +* Running the test suite:: +* Environment variables:: +* Packaging notes:: +* Overview of code structure:: +* Design notes:: +* Submitting patches:: + +Running the test suite + +* Running under valgrind:: + +@end detailmenu +@end menu + +@node Tutorial,Topic Reference,Top,Top +@anchor{intro/index doc}@anchor{1}@anchor{intro/index libgccjit}@anchor{2}@anchor{intro/index tutorial}@anchor{3} +@chapter Tutorial + + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Tutorial part 1; “Hello world”: Tutorial part 1 “Hello world”. +* Tutorial part 2; Creating a trivial machine code function: Tutorial part 2 Creating a trivial machine code function. +* Tutorial part 3; Loops and variables: Tutorial part 3 Loops and variables. +* Tutorial part 4; Adding JIT-compilation to a toy interpreter: Tutorial part 4 Adding JIT-compilation to a toy interpreter. +* Tutorial part 5; Implementing an Ahead-of-Time compiler: Tutorial part 5 Implementing an Ahead-of-Time compiler. + +@end menu + +@node Tutorial part 1 “Hello world”,Tutorial part 2 Creating a trivial machine code function,,Tutorial +@anchor{intro/tutorial01 doc}@anchor{4}@anchor{intro/tutorial01 tutorial-part-1-hello-world}@anchor{5} +@section Tutorial part 1: “Hello world” + + +Before we look at the details of the API, let’s look at building and +running programs that use the library. + +Here’s a toy “hello world” program that uses the library to synthesize +a call to @cite{printf} and uses it to write a message to stdout. + +Don’t worry about the content of the program for now; we’ll cover +the details in later parts of this tutorial. + +@quotation + +@example +/* Smoketest example for libgccjit.so + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +static void +create_code (gcc_jit_context *ctxt) +@{ + /* Let's try to inject the equivalent of: + void + greet (const char *name) + @{ + printf ("hello %s\n", name); + @} + */ + gcc_jit_type *void_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID); + gcc_jit_type *const_char_ptr_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_CONST_CHAR_PTR); + gcc_jit_param *param_name = + gcc_jit_context_new_param (ctxt, NULL, const_char_ptr_type, "name"); + gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + void_type, + "greet", + 1, ¶m_name, + 0); + + gcc_jit_param *param_format = + gcc_jit_context_new_param (ctxt, NULL, const_char_ptr_type, "format"); + gcc_jit_function *printf_func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_IMPORTED, + gcc_jit_context_get_type ( + ctxt, GCC_JIT_TYPE_INT), + "printf", + 1, ¶m_format, + 1); + gcc_jit_rvalue *args[2]; + args[0] = gcc_jit_context_new_string_literal (ctxt, "hello %s\n"); + args[1] = gcc_jit_param_as_rvalue (param_name); + + gcc_jit_block *block = gcc_jit_function_new_block (func, NULL); + + gcc_jit_block_add_eval ( + block, NULL, + gcc_jit_context_new_call (ctxt, + NULL, + printf_func, + 2, args)); + gcc_jit_block_end_with_void_return (block, NULL); +@} + +int +main (int argc, char **argv) +@{ + gcc_jit_context *ctxt; + gcc_jit_result *result; + + /* Get a "context" object for working with the library. */ + ctxt = gcc_jit_context_acquire (); + if (!ctxt) + @{ + fprintf (stderr, "NULL ctxt"); + exit (1); + @} + + /* Set some options on the context. + Let's see the code being generated, in assembler form. */ + gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + result = gcc_jit_context_compile (ctxt); + if (!result) + @{ + fprintf (stderr, "NULL result"); + exit (1); + @} + + /* Extract the generated code from "result". */ + typedef void (*fn_type) (const char *); + fn_type greet = + (fn_type)gcc_jit_result_get_code (result, "greet"); + if (!greet) + @{ + fprintf (stderr, "NULL greet"); + exit (1); + @} + + /* Now call the generated function: */ + greet ("world"); + fflush (stdout); + + gcc_jit_context_release (ctxt); + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Copy the above to @cite{tut01-hello-world.c}. + +Assuming you have the jit library installed, build the test program +using: + +@example +$ gcc \ + tut01-hello-world.c \ + -o tut01-hello-world \ + -lgccjit +@end example + +You should then be able to run the built program: + +@example +$ ./tut01-hello-world +hello world +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 2 Creating a trivial machine code function,Tutorial part 3 Loops and variables,Tutorial part 1 “Hello world”,Tutorial +@anchor{intro/tutorial02 doc}@anchor{6}@anchor{intro/tutorial02 tutorial-part-2-creating-a-trivial-machine-code-function}@anchor{7} +@section Tutorial part 2: Creating a trivial machine code function + + +Consider this C function: + +@example +int square (int i) +@{ + return i * i; +@} +@end example + +How can we construct this at run-time using libgccjit? + +First we need to include the relevant header: + +@example +#include +@end example + +All state associated with compilation is associated with a +@ref{8,,gcc_jit_context *}. + +Create one using @ref{9,,gcc_jit_context_acquire()}: + +@example +gcc_jit_context *ctxt; +ctxt = gcc_jit_context_acquire (); +@end example + +The JIT library has a system of types. It is statically-typed: every +expression is of a specific type, fixed at compile-time. In our example, +all of the expressions are of the C @cite{int} type, so let’s obtain this from +the context, as a @ref{a,,gcc_jit_type *}, using +@ref{b,,gcc_jit_context_get_type()}: + +@example +gcc_jit_type *int_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); +@end example + +@ref{a,,gcc_jit_type *} is an example of a “contextual” object: every +entity in the API is associated with a @ref{8,,gcc_jit_context *}. + +Memory management is easy: all such “contextual” objects are automatically +cleaned up for you when the context is released, using +@ref{c,,gcc_jit_context_release()}: + +@example +gcc_jit_context_release (ctxt); +@end example + +so you don’t need to manually track and cleanup all objects, just the +contexts. + +Although the API is C-based, there is a form of class hierarchy, which +looks like this: + +@example ++- gcc_jit_object + +- gcc_jit_location + +- gcc_jit_type + +- gcc_jit_struct + +- gcc_jit_field + +- gcc_jit_function + +- gcc_jit_block + +- gcc_jit_rvalue + +- gcc_jit_lvalue + +- gcc_jit_param +@end example + +There are casting methods for upcasting from subclasses to parent classes. +For example, @ref{d,,gcc_jit_type_as_object()}: + +@example +gcc_jit_object *obj = gcc_jit_type_as_object (int_type); +@end example + +One thing you can do with a @ref{e,,gcc_jit_object *} is +to ask it for a human-readable description, using +@ref{f,,gcc_jit_object_get_debug_string()}: + +@example +printf ("obj: %s\n", gcc_jit_object_get_debug_string (obj)); +@end example + +giving this text on stdout: + +@example +obj: int +@end example + +This is invaluable when debugging. + +Let’s create the function. To do so, we first need to construct +its single parameter, specifying its type and giving it a name, +using @ref{10,,gcc_jit_context_new_param()}: + +@example +gcc_jit_param *param_i = + gcc_jit_context_new_param (ctxt, NULL, int_type, "i"); +@end example + +Now we can create the function, using +@ref{11,,gcc_jit_context_new_function()}: + +@example +gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + int_type, + "square", + 1, ¶m_i, + 0); +@end example + +To define the code within the function, we must create basic blocks +containing statements. + +Every basic block contains a list of statements, eventually terminated +by a statement that either returns, or jumps to another basic block. + +Our function has no control-flow, so we just need one basic block: + +@example +gcc_jit_block *block = gcc_jit_function_new_block (func, NULL); +@end example + +Our basic block is relatively simple: it immediately terminates by +returning the value of an expression. + +We can build the expression using @ref{12,,gcc_jit_context_new_binary_op()}: + +@example +gcc_jit_rvalue *expr = + gcc_jit_context_new_binary_op ( + ctxt, NULL, + GCC_JIT_BINARY_OP_MULT, int_type, + gcc_jit_param_as_rvalue (param_i), + gcc_jit_param_as_rvalue (param_i)); +@end example + +A @ref{13,,gcc_jit_rvalue *} is another example of a +@ref{e,,gcc_jit_object *} subclass. We can upcast it using +@ref{14,,gcc_jit_rvalue_as_object()} and as before print it with +@ref{f,,gcc_jit_object_get_debug_string()}. + +@example +printf ("expr: %s\n", + gcc_jit_object_get_debug_string ( + gcc_jit_rvalue_as_object (expr))); +@end example + +giving this output: + +@example +expr: i * i +@end example + +Creating the expression in itself doesn’t do anything; we have to add +this expression to a statement within the block. In this case, we use it +to build a return statement, which terminates the basic block: + +@example +gcc_jit_block_end_with_return (block, NULL, expr); +@end example + +OK, we’ve populated the context. We can now compile it using +@ref{15,,gcc_jit_context_compile()}: + +@example +gcc_jit_result *result; +result = gcc_jit_context_compile (ctxt); +@end example + +and get a @ref{16,,gcc_jit_result *}. + +At this point we’re done with the context; we can release it: + +@example +gcc_jit_context_release (ctxt); +@end example + +We can now use @ref{17,,gcc_jit_result_get_code()} to look up a specific +machine code routine within the result, in this case, the function we +created above. + +@example +void *fn_ptr = gcc_jit_result_get_code (result, "square"); +if (!fn_ptr) + @{ + fprintf (stderr, "NULL fn_ptr"); + goto error; + @} +@end example + +We can now cast the pointer to an appropriate function pointer type, and +then call it: + +@example +typedef int (*fn_type) (int); +fn_type square = (fn_type)fn_ptr; +printf ("result: %d", square (5)); +@end example + +@example +result: 25 +@end example + +Once we’re done with the code, we can release the result: + +@example +gcc_jit_result_release (result); +@end example + +We can’t call @code{square} anymore once we’ve released @code{result}. + +@menu +* Error-handling:: +* Options:: +* Full example:: + +@end menu + +@node Error-handling,Options,,Tutorial part 2 Creating a trivial machine code function +@anchor{intro/tutorial02 error-handling}@anchor{18} +@subsection Error-handling + + +Various kinds of errors are possible when using the API, such as +mismatched types in an assignment. You can only compile and get code +from a context if no errors occur. + +Errors are printed on stderr; they typically contain the name of the API +entrypoint where the error occurred, and pertinent information on the +problem: + +@example +./buggy-program: error: gcc_jit_block_add_assignment: mismatching types: assignment to i (type: int) from "hello world" (type: const char *) +@end example + +The API is designed to cope with errors without crashing, so you can get +away with having a single error-handling check in your code: + +@example +void *fn_ptr = gcc_jit_result_get_code (result, "square"); +if (!fn_ptr) + @{ + fprintf (stderr, "NULL fn_ptr"); + goto error; + @} +@end example + +For more information, see the @ref{19,,error-handling guide} +within the Topic eference. + +@node Options,Full example,Error-handling,Tutorial part 2 Creating a trivial machine code function +@anchor{intro/tutorial02 options}@anchor{1a} +@subsection Options + + +To get more information on what’s going on, you can set debugging flags +on the context using @ref{1b,,gcc_jit_context_set_bool_option()}. + +@c (I'm deliberately not mentioning +@c :c:macro:`GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE` here since I think +@c it's probably more of use to implementors than to users) + +Setting @ref{1c,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE} will dump a +C-like representation to stderr when you compile (GCC’s “GIMPLE” +representation): + +@example +gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, + 1); +result = gcc_jit_context_compile (ctxt); +@end example + +@example +square (signed int i) +@{ + signed int D.260; + + entry: + D.260 = i * i; + return D.260; +@} +@end example + +We can see the generated machine code in assembler form (on stderr) by +setting @ref{1d,,GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE} on the context +before compiling: + +@example +gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 1); +result = gcc_jit_context_compile (ctxt); +@end example + +@example + .file "fake.c" + .text + .globl square + .type square, @@function +square: +.LFB6: + .cfi_startproc + pushq %rbp + .cfi_def_cfa_offset 16 + .cfi_offset 6, -16 + movq %rsp, %rbp + .cfi_def_cfa_register 6 + movl %edi, -4(%rbp) +.L14: + movl -4(%rbp), %eax + imull -4(%rbp), %eax + popq %rbp + .cfi_def_cfa 7, 8 + ret + .cfi_endproc +.LFE6: + .size square, .-square + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-0.5.1920c315ff984892399893b380305ab36e07b455.fc20)" + .section .note.GNU-stack,"",@@progbits +@end example + +By default, no optimizations are performed, the equivalent of GCC’s +@cite{-O0} option. We can turn things up to e.g. @cite{-O3} by calling +@ref{1e,,gcc_jit_context_set_int_option()} with +@ref{1f,,GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL}: + +@example +gcc_jit_context_set_int_option ( + ctxt, + GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, + 3); +@end example + +@example + .file "fake.c" + .text + .p2align 4,,15 + .globl square + .type square, @@function +square: +.LFB7: + .cfi_startproc +.L16: + movl %edi, %eax + imull %edi, %eax + ret + .cfi_endproc +.LFE7: + .size square, .-square + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-0.5.1920c315ff984892399893b380305ab36e07b455.fc20)" + .section .note.GNU-stack,"",@@progbits +@end example + +Naturally this has only a small effect on such a trivial function. + +@node Full example,,Options,Tutorial part 2 Creating a trivial machine code function +@anchor{intro/tutorial02 full-example}@anchor{20} +@subsection Full example + + +Here’s what the above looks like as a complete program: + +@quotation + +@example +/* Usage example for libgccjit.so + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +void +create_code (gcc_jit_context *ctxt) +@{ + /* Let's try to inject the equivalent of: + + int square (int i) + @{ + return i * i; + @} + */ + gcc_jit_type *int_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + gcc_jit_param *param_i = + gcc_jit_context_new_param (ctxt, NULL, int_type, "i"); + gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + int_type, + "square", + 1, ¶m_i, + 0); + + gcc_jit_block *block = gcc_jit_function_new_block (func, NULL); + + gcc_jit_rvalue *expr = + gcc_jit_context_new_binary_op ( + ctxt, NULL, + GCC_JIT_BINARY_OP_MULT, int_type, + gcc_jit_param_as_rvalue (param_i), + gcc_jit_param_as_rvalue (param_i)); + + gcc_jit_block_end_with_return (block, NULL, expr); +@} + +int +main (int argc, char **argv) +@{ + gcc_jit_context *ctxt = NULL; + gcc_jit_result *result = NULL; + + /* Get a "context" object for working with the library. */ + ctxt = gcc_jit_context_acquire (); + if (!ctxt) + @{ + fprintf (stderr, "NULL ctxt"); + goto error; + @} + + /* Set some options on the context. + Let's see the code being generated, in assembler form. */ + gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + result = gcc_jit_context_compile (ctxt); + if (!result) + @{ + fprintf (stderr, "NULL result"); + goto error; + @} + + /* We're done with the context; we can release it: */ + gcc_jit_context_release (ctxt); + ctxt = NULL; + + /* Extract the generated code from "result". */ + void *fn_ptr = gcc_jit_result_get_code (result, "square"); + if (!fn_ptr) + @{ + fprintf (stderr, "NULL fn_ptr"); + goto error; + @} + + typedef int (*fn_type) (int); + fn_type square = (fn_type)fn_ptr; + printf ("result: %d\n", square (5)); + + error: + if (ctxt) + gcc_jit_context_release (ctxt); + if (result) + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Building and running it: + +@example +$ gcc \ + tut02-square.c \ + -o tut02-square \ + -lgccjit + +# Run the built program: +$ ./tut02-square +result: 25 +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 3 Loops and variables,Tutorial part 4 Adding JIT-compilation to a toy interpreter,Tutorial part 2 Creating a trivial machine code function,Tutorial +@anchor{intro/tutorial03 doc}@anchor{21}@anchor{intro/tutorial03 tutorial-part-3-loops-and-variables}@anchor{22} +@section Tutorial part 3: Loops and variables + + +Consider this C function: + +@quotation + +@example +int loop_test (int n) +@{ + int sum = 0; + for (int i = 0; i < n; i++) + sum += i * i; + return sum; +@} +@end example +@end quotation + +This example demonstrates some more features of libgccjit, with local +variables and a loop. + +To break this down into libgccjit terms, it’s usually easier to reword +the @cite{for} loop as a @cite{while} loop, giving: + +@quotation + +@example +int loop_test (int n) +@{ + int sum = 0; + int i = 0; + while (i < n) + @{ + sum += i * i; + i++; + @} + return sum; +@} +@end example +@end quotation + +Here’s what the final control flow graph will look like: + +@quotation + + +@float Figure + +@image{libgccjit-figures/sum-of-squares1,,,image of a control flow graph,png} + +@end float + +@end quotation + +As before, we include the libgccjit header and make a +@ref{8,,gcc_jit_context *}. + +@example +#include + +void test (void) +@{ + gcc_jit_context *ctxt; + ctxt = gcc_jit_context_acquire (); +@end example + +The function works with the C @cite{int} type: + +@example +gcc_jit_type *the_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); +gcc_jit_type *return_type = the_type; +@end example + +though we could equally well make it work on, say, @cite{double}: + +@example +gcc_jit_type *the_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_DOUBLE); +@end example + +Let’s build the function: + +@example +gcc_jit_param *n = + gcc_jit_context_new_param (ctxt, NULL, the_type, "n"); +gcc_jit_param *params[1] = @{n@}; +gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + return_type, + "loop_test", + 1, params, 0); +@end example + +@menu +* Expressions; lvalues and rvalues: Expressions lvalues and rvalues. +* Control flow:: +* Visualizing the control flow graph:: +* Full example: Full example<2>. + +@end menu + +@node Expressions lvalues and rvalues,Control flow,,Tutorial part 3 Loops and variables +@anchor{intro/tutorial03 expressions-lvalues-and-rvalues}@anchor{23} +@subsection Expressions: lvalues and rvalues + + +The base class of expression is the @ref{13,,gcc_jit_rvalue *}, +representing an expression that can be on the @emph{right}-hand side of +an assignment: a value that can be computed somehow, and assigned +@emph{to} a storage area (such as a variable). It has a specific +@ref{a,,gcc_jit_type *}. + +Anothe important class is @ref{24,,gcc_jit_lvalue *}. +A @ref{24,,gcc_jit_lvalue *}. is something that can of the @emph{left}-hand +side of an assignment: a storage area (such as a variable). + +In other words, every assignment can be thought of as: + +@example +LVALUE = RVALUE; +@end example + +Note that @ref{24,,gcc_jit_lvalue *} is a subclass of +@ref{13,,gcc_jit_rvalue *}, where in an assignment of the form: + +@example +LVALUE_A = LVALUE_B; +@end example + +the @cite{LVALUE_B} implies reading the current value of that storage +area, assigning it into the @cite{LVALUE_A}. + +So far the only expressions we’ve seen are @cite{i * i}: + +@example +gcc_jit_rvalue *expr = + gcc_jit_context_new_binary_op ( + ctxt, NULL, + GCC_JIT_BINARY_OP_MULT, int_type, + gcc_jit_param_as_rvalue (param_i), + gcc_jit_param_as_rvalue (param_i)); +@end example + +which is a @ref{13,,gcc_jit_rvalue *}, and the various function +parameters: @cite{param_i} and @cite{param_n}, instances of +@ref{25,,gcc_jit_param *}, which is a subclass of +@ref{24,,gcc_jit_lvalue *} (and, in turn, of @ref{13,,gcc_jit_rvalue *}): +we can both read from and write to function parameters within the +body of a function. + +Our new example has a couple of local variables. We create them by +calling @ref{26,,gcc_jit_function_new_local()}, supplying a type and a +name: + +@example +/* Build locals: */ +gcc_jit_lvalue *i = + gcc_jit_function_new_local (func, NULL, the_type, "i"); +gcc_jit_lvalue *sum = + gcc_jit_function_new_local (func, NULL, the_type, "sum"); +@end example + +These are instances of @ref{24,,gcc_jit_lvalue *} - they can be read from +and written to. + +Note that there is no precanned way to create @emph{and} initialize a variable +like in C: + +@example +int i = 0; +@end example + +Instead, having added the local to the function, we have to separately add +an assignment of @cite{0} to @cite{local_i} at the beginning of the function. + +@node Control flow,Visualizing the control flow graph,Expressions lvalues and rvalues,Tutorial part 3 Loops and variables +@anchor{intro/tutorial03 control-flow}@anchor{27} +@subsection Control flow + + +This function has a loop, so we need to build some basic blocks to +handle the control flow. In this case, we need 4 blocks: + + +@enumerate + +@item +before the loop (initializing the locals) + +@item +the conditional at the top of the loop (comparing @cite{i < n}) + +@item +the body of the loop + +@item +after the loop terminates (@cite{return sum}) +@end enumerate + +so we create these as @ref{28,,gcc_jit_block *} instances within the +@ref{29,,gcc_jit_function *}: + +@example +gcc_jit_block *b_initial = + gcc_jit_function_new_block (func, "initial"); +gcc_jit_block *b_loop_cond = + gcc_jit_function_new_block (func, "loop_cond"); +gcc_jit_block *b_loop_body = + gcc_jit_function_new_block (func, "loop_body"); +gcc_jit_block *b_after_loop = + gcc_jit_function_new_block (func, "after_loop"); +@end example + +We now populate each block with statements. + +The entry block @cite{b_initial} consists of initializations followed by a jump +to the conditional. We assign @cite{0} to @cite{i} and to @cite{sum}, using +@ref{2a,,gcc_jit_block_add_assignment()} to add +an assignment statement, and using @ref{2b,,gcc_jit_context_zero()} to get +the constant value @cite{0} for the relevant type for the right-hand side of +the assignment: + +@example +/* sum = 0; */ +gcc_jit_block_add_assignment ( + b_initial, NULL, + sum, + gcc_jit_context_zero (ctxt, the_type)); + +/* i = 0; */ +gcc_jit_block_add_assignment ( + b_initial, NULL, + i, + gcc_jit_context_zero (ctxt, the_type)); +@end example + +We can then terminate the entry block by jumping to the conditional: + +@example +gcc_jit_block_end_with_jump (b_initial, NULL, b_loop_cond); +@end example + +The conditional block is equivalent to the line @cite{while (i < n)} from our +C example. It contains a single statement: a conditional, which jumps to +one of two destination blocks depending on a boolean +@ref{13,,gcc_jit_rvalue *}, in this case the comparison of @cite{i} and @cite{n}. +We build the comparison using @ref{2c,,gcc_jit_context_new_comparison()}: + +@example +/* (i >= n) */ + gcc_jit_rvalue *guard = + gcc_jit_context_new_comparison ( + ctxt, NULL, + GCC_JIT_COMPARISON_GE, + gcc_jit_lvalue_as_rvalue (i), + gcc_jit_param_as_rvalue (n)); +@end example + +and can then use this to add @cite{b_loop_cond}’s sole statement, via +@ref{2d,,gcc_jit_block_end_with_conditional()}: + +@example +/* Equivalent to: + if (guard) + goto after_loop; + else + goto loop_body; */ +gcc_jit_block_end_with_conditional ( + b_loop_cond, NULL, + guard, + b_after_loop, /* on_true */ + b_loop_body); /* on_false */ +@end example + +Next, we populate the body of the loop. + +The C statement @cite{sum += i * i;} is an assignment operation, where an +lvalue is modified “in-place”. We use +@ref{2e,,gcc_jit_block_add_assignment_op()} to handle these operations: + +@example +/* sum += i * i */ +gcc_jit_block_add_assignment_op ( + b_loop_body, NULL, + sum, + GCC_JIT_BINARY_OP_PLUS, + gcc_jit_context_new_binary_op ( + ctxt, NULL, + GCC_JIT_BINARY_OP_MULT, the_type, + gcc_jit_lvalue_as_rvalue (i), + gcc_jit_lvalue_as_rvalue (i))); +@end example + +The @cite{i++} can be thought of as @cite{i += 1}, and can thus be handled in +a similar way. We use @ref{2f,,gcc_jit_context_one()} to get the constant +value @cite{1} (for the relevant type) for the right-hand side +of the assignment. + +@example +/* i++ */ +gcc_jit_block_add_assignment_op ( + b_loop_body, NULL, + i, + GCC_JIT_BINARY_OP_PLUS, + gcc_jit_context_one (ctxt, the_type)); +@end example + +@cartouche +@quotation Note +For numeric constants other than 0 or 1, we could use +@ref{30,,gcc_jit_context_new_rvalue_from_int()} and +@ref{31,,gcc_jit_context_new_rvalue_from_double()}. +@end quotation +@end cartouche + +The loop body completes by jumping back to the conditional: + +@example +gcc_jit_block_end_with_jump (b_loop_body, NULL, b_loop_cond); +@end example + +Finally, we populate the @cite{b_after_loop} block, reached when the loop +conditional is false. We want to generate the equivalent of: + +@example +return sum; +@end example + +so the block is just one statement: + +@example +/* return sum */ +gcc_jit_block_end_with_return ( + b_after_loop, + NULL, + gcc_jit_lvalue_as_rvalue (sum)); +@end example + +@cartouche +@quotation Note +You can intermingle block creation with statement creation, +but given that the terminator statements generally include references +to other blocks, I find it’s clearer to create all the blocks, +@emph{then} all the statements. +@end quotation +@end cartouche + +We’ve finished populating the function. As before, we can now compile it +to machine code: + +@example +gcc_jit_result *result; +result = gcc_jit_context_compile (ctxt); + +typedef int (*loop_test_fn_type) (int); +loop_test_fn_type loop_test = + (loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test"); +if (!loop_test) + goto error; +printf ("result: %d", loop_test (10)); +@end example + +@example +result: 285 +@end example + +@node Visualizing the control flow graph,Full example<2>,Control flow,Tutorial part 3 Loops and variables +@anchor{intro/tutorial03 visualizing-the-control-flow-graph}@anchor{32} +@subsection Visualizing the control flow graph + + +You can see the control flow graph of a function using +@ref{33,,gcc_jit_function_dump_to_dot()}: + +@example +gcc_jit_function_dump_to_dot (func, "/tmp/sum-of-squares.dot"); +@end example + +giving a .dot file in GraphViz format. + +You can convert this to an image using @cite{dot}: + +@example +$ dot -Tpng /tmp/sum-of-squares.dot -o /tmp/sum-of-squares.png +@end example + +or use a viewer (my preferred one is xdot.py; see +@indicateurl{https://github.com/jrfonseca/xdot.py}; on Fedora you can +install it with @cite{yum install python-xdot}): + +@quotation + + +@float Figure + +@image{libgccjit-figures/sum-of-squares1,,,image of a control flow graph,png} + +@end float + +@end quotation + +@node Full example<2>,,Visualizing the control flow graph,Tutorial part 3 Loops and variables +@anchor{intro/tutorial03 full-example}@anchor{34} +@subsection Full example + + +@quotation + +@example +/* Usage example for libgccjit.so + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +void +create_code (gcc_jit_context *ctxt) +@{ + /* + Simple sum-of-squares, to test conditionals and looping + + int loop_test (int n) + @{ + int i; + int sum = 0; + for (i = 0; i < n ; i ++) + @{ + sum += i * i; + @} + return sum; + */ + gcc_jit_type *the_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + gcc_jit_type *return_type = the_type; + + gcc_jit_param *n = + gcc_jit_context_new_param (ctxt, NULL, the_type, "n"); + gcc_jit_param *params[1] = @{n@}; + gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + return_type, + "loop_test", + 1, params, 0); + + /* Build locals: */ + gcc_jit_lvalue *i = + gcc_jit_function_new_local (func, NULL, the_type, "i"); + gcc_jit_lvalue *sum = + gcc_jit_function_new_local (func, NULL, the_type, "sum"); + + gcc_jit_block *b_initial = + gcc_jit_function_new_block (func, "initial"); + gcc_jit_block *b_loop_cond = + gcc_jit_function_new_block (func, "loop_cond"); + gcc_jit_block *b_loop_body = + gcc_jit_function_new_block (func, "loop_body"); + gcc_jit_block *b_after_loop = + gcc_jit_function_new_block (func, "after_loop"); + + /* sum = 0; */ + gcc_jit_block_add_assignment ( + b_initial, NULL, + sum, + gcc_jit_context_zero (ctxt, the_type)); + + /* i = 0; */ + gcc_jit_block_add_assignment ( + b_initial, NULL, + i, + gcc_jit_context_zero (ctxt, the_type)); + + gcc_jit_block_end_with_jump (b_initial, NULL, b_loop_cond); + + /* if (i >= n) */ + gcc_jit_block_end_with_conditional ( + b_loop_cond, NULL, + gcc_jit_context_new_comparison ( + ctxt, NULL, + GCC_JIT_COMPARISON_GE, + gcc_jit_lvalue_as_rvalue (i), + gcc_jit_param_as_rvalue (n)), + b_after_loop, + b_loop_body); + + /* sum += i * i */ + gcc_jit_block_add_assignment_op ( + b_loop_body, NULL, + sum, + GCC_JIT_BINARY_OP_PLUS, + gcc_jit_context_new_binary_op ( + ctxt, NULL, + GCC_JIT_BINARY_OP_MULT, the_type, + gcc_jit_lvalue_as_rvalue (i), + gcc_jit_lvalue_as_rvalue (i))); + + /* i++ */ + gcc_jit_block_add_assignment_op ( + b_loop_body, NULL, + i, + GCC_JIT_BINARY_OP_PLUS, + gcc_jit_context_one (ctxt, the_type)); + + gcc_jit_block_end_with_jump (b_loop_body, NULL, b_loop_cond); + + /* return sum */ + gcc_jit_block_end_with_return ( + b_after_loop, + NULL, + gcc_jit_lvalue_as_rvalue (sum)); +@} + +int +main (int argc, char **argv) +@{ + gcc_jit_context *ctxt = NULL; + gcc_jit_result *result = NULL; + + /* Get a "context" object for working with the library. */ + ctxt = gcc_jit_context_acquire (); + if (!ctxt) + @{ + fprintf (stderr, "NULL ctxt"); + goto error; + @} + + /* Set some options on the context. + Let's see the code being generated, in assembler form. */ + gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + result = gcc_jit_context_compile (ctxt); + if (!result) + @{ + fprintf (stderr, "NULL result"); + goto error; + @} + + /* Extract the generated code from "result". */ + typedef int (*loop_test_fn_type) (int); + loop_test_fn_type loop_test = + (loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test"); + if (!loop_test) + @{ + fprintf (stderr, "NULL loop_test"); + goto error; + @} + + /* Run the generated code. */ + int val = loop_test (10); + printf("loop_test returned: %d\n", val); + + error: + gcc_jit_context_release (ctxt); + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Building and running it: + +@example +$ gcc \ + tut03-sum-of-squares.c \ + -o tut03-sum-of-squares \ + -lgccjit + +# Run the built program: +$ ./tut03-sum-of-squares +loop_test returned: 285 +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 4 Adding JIT-compilation to a toy interpreter,Tutorial part 5 Implementing an Ahead-of-Time compiler,Tutorial part 3 Loops and variables,Tutorial +@anchor{intro/tutorial04 doc}@anchor{35}@anchor{intro/tutorial04 tutorial-part-4-adding-jit-compilation-to-a-toy-interpreter}@anchor{36} +@section Tutorial part 4: Adding JIT-compilation to a toy interpreter + + +In this example we construct a “toy” interpreter, and add JIT-compilation +to it. + +@menu +* Our toy interpreter:: +* Compiling to machine code:: +* Setting things up:: +* Populating the function:: +* Verifying the control flow graph:: +* Compiling the context:: +* Single-stepping through the generated code:: +* Examining the generated code:: +* Putting it all together:: +* Behind the curtain; How does our code get optimized?: Behind the curtain How does our code get optimized?. + +@end menu + +@node Our toy interpreter,Compiling to machine code,,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 our-toy-interpreter}@anchor{37} +@subsection Our toy interpreter + + +It’s a stack-based interpreter, and is intended as a (very simple) example +of the kind of bytecode interpreter seen in dynamic languages such as +Python, Ruby etc. + +For the sake of simplicity, our toy virtual machine is very limited: + +@quotation + + +@itemize * + +@item +The only data type is @cite{int} + +@item +It can only work on one function at a time (so that the only +function call that can be made is to recurse). + +@item +Functions can only take one parameter. + +@item +Functions have a stack of @cite{int} values. + +@item +We’ll implement function call within the interpreter by calling a +function in our implementation, rather than implementing our own +frame stack. + +@item +The parser is only good enough to get the examples to work. +@end itemize +@end quotation + +Naturally, a real interpreter would be much more complicated that this. + +The following operations are supported: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxx} +@headitem + +Operation + +@tab + +Meaning + +@tab + +Old Stack + +@tab + +New Stack + +@item + +DUP + +@tab + +Duplicate top of stack. + +@tab + +@code{[..., x]} + +@tab + +@code{[..., x, x]} + +@item + +ROT + +@tab + +Swap top two elements +of stack. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., y, x]} + +@item + +BINARY_ADD + +@tab + +Add the top two elements +on the stack. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x+y)]} + +@item + +BINARY_SUBTRACT + +@tab + +Likewise, but subtract. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x-y)]} + +@item + +BINARY_MULT + +@tab + +Likewise, but multiply. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x*y)]} + +@item + +BINARY_COMPARE_LT + +@tab + +Compare the top two +elements on the stack +and push a nonzero/zero +if (xfn_num_ops); + op = &fn->fn_ops[frame.frm_pc++]; + + if (trace) + @{ + toyvm_frame_dump_stack (&frame, trace); + toyvm_function_disassemble_op (fn, op, frame.frm_pc, trace); + @} + + switch (op->op_opcode) + @{ + /* Ops taking no operand. */ + case DUP: + x = POP (); + PUSH (x); + PUSH (x); + break; + + case ROT: + y = POP (); + x = POP (); + PUSH (y); + PUSH (x); + break; + + case BINARY_ADD: + y = POP (); + x = POP (); + PUSH (x + y); + break; + + case BINARY_SUBTRACT: + y = POP (); + x = POP (); + PUSH (x - y); + break; + + case BINARY_MULT: + y = POP (); + x = POP (); + PUSH (x * y); + break; + + case BINARY_COMPARE_LT: + y = POP (); + x = POP (); + PUSH (x < y); + break; + + case RECURSE: + x = POP (); + x = toyvm_function_interpret (fn, x, trace); + PUSH (x); + break; + + case RETURN: + return POP (); + + /* Ops taking an operand. */ + case PUSH_CONST: + PUSH (op->op_operand); + break; + + case JUMP_ABS_IF_TRUE: + x = POP (); + if (x) + frame.frm_pc = op->op_operand; + break; + + default: + assert (0); /* unknown opcode */ + + @} /* end of switch on opcode */ + @} /* end of while loop */ + +#undef PUSH +#undef POP +@} + +@end example +@end quotation + +@node Compiling to machine code,Setting things up,Our toy interpreter,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 compiling-to-machine-code}@anchor{38} +@subsection Compiling to machine code + + +We want to generate machine code that can be cast to this type and +then directly executed in-process: + +@quotation + +@example +typedef int (*toyvm_compiled_code) (int); + +@end example +@end quotation + +The lifetime of the code is tied to that of a @ref{16,,gcc_jit_result *}. +We’ll handle this by bundling them up in a structure, so that we can +clean them up together by calling @ref{39,,gcc_jit_result_release()}: + +@quotation + +@example + +struct toyvm_compiled_function +@{ + gcc_jit_result *cf_jit_result; + toyvm_compiled_code cf_code; +@}; + +@end example +@end quotation + +Our compiler isn’t very sophisticated; it takes the implementation of +each opcode above, and maps it directly to the operations supported by +the libgccjit API. + +How should we handle the stack? In theory we could calculate what the +stack depth will be at each opcode, and optimize away the stack +manipulation “by hand”. We’ll see below that libgccjit is able to do +this for us, so we’ll implement stack manipulation +in a direct way, by creating a @code{stack} array and @code{stack_depth} +variables, local within the generated function, equivalent to this C code: + +@example +int stack_depth; +int stack[MAX_STACK_DEPTH]; +@end example + +We’ll also have local variables @code{x} and @code{y} for use when implementing +the opcodes, equivalent to this: + +@example +int x; +int y; +@end example + +This means our compiler has the following state: + +@quotation + +@example + +struct compilation_state +@{ + gcc_jit_context *ctxt; + + gcc_jit_type *int_type; + gcc_jit_type *bool_type; + gcc_jit_type *stack_type; /* int[MAX_STACK_DEPTH] */ + + gcc_jit_rvalue *const_one; + + gcc_jit_function *fn; + gcc_jit_param *param_arg; + gcc_jit_lvalue *stack; + gcc_jit_lvalue *stack_depth; + gcc_jit_lvalue *x; + gcc_jit_lvalue *y; + + gcc_jit_location *op_locs[MAX_OPS]; + gcc_jit_block *initial_block; + gcc_jit_block *op_blocks[MAX_OPS]; + +@}; + +@end example +@end quotation + +@node Setting things up,Populating the function,Compiling to machine code,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 setting-things-up}@anchor{3a} +@subsection Setting things up + + +First we create our types: + +@quotation + +@example + state.int_type = + gcc_jit_context_get_type (state.ctxt, GCC_JIT_TYPE_INT); + state.bool_type = + gcc_jit_context_get_type (state.ctxt, GCC_JIT_TYPE_BOOL); + state.stack_type = + gcc_jit_context_new_array_type (state.ctxt, NULL, + state.int_type, MAX_STACK_DEPTH); + +@end example +@end quotation + +along with extracting a useful @cite{int} constant: + +@quotation + +@example + state.const_one = gcc_jit_context_one (state.ctxt, state.int_type); + +@end example +@end quotation + +We’ll implement push and pop in terms of the @code{stack} array and +@code{stack_depth}. Here are helper functions for adding statements to +a block, implementing pushing and popping values: + +@quotation + +@example + +static void +add_push (compilation_state *state, + gcc_jit_block *block, + gcc_jit_rvalue *rvalue, + gcc_jit_location *loc) +@{ + /* stack[stack_depth] = RVALUE */ + gcc_jit_block_add_assignment ( + block, + loc, + /* stack[stack_depth] */ + gcc_jit_context_new_array_access ( + state->ctxt, + loc, + gcc_jit_lvalue_as_rvalue (state->stack), + gcc_jit_lvalue_as_rvalue (state->stack_depth)), + rvalue); + + /* "stack_depth++;". */ + gcc_jit_block_add_assignment_op ( + block, + loc, + state->stack_depth, + GCC_JIT_BINARY_OP_PLUS, + state->const_one); +@} + +static void +add_pop (compilation_state *state, + gcc_jit_block *block, + gcc_jit_lvalue *lvalue, + gcc_jit_location *loc) +@{ + /* "--stack_depth;". */ + gcc_jit_block_add_assignment_op ( + block, + loc, + state->stack_depth, + GCC_JIT_BINARY_OP_MINUS, + state->const_one); + + /* "LVALUE = stack[stack_depth];". */ + gcc_jit_block_add_assignment ( + block, + loc, + lvalue, + /* stack[stack_depth] */ + gcc_jit_lvalue_as_rvalue ( + gcc_jit_context_new_array_access ( + state->ctxt, + loc, + gcc_jit_lvalue_as_rvalue (state->stack), + gcc_jit_lvalue_as_rvalue (state->stack_depth)))); +@} + +@end example +@end quotation + +We will support single-stepping through the generated code in the +debugger, so we need to create @ref{3b,,gcc_jit_location} instances, one +per operation in the source code. These will reference the lines of +e.g. @code{factorial.toy}. + +@quotation + +@example + for (pc = 0; pc < fn->fn_num_ops; pc++) + @{ + toyvm_op *op = &fn->fn_ops[pc]; + + state.op_locs[pc] = gcc_jit_context_new_location (state.ctxt, + fn->fn_filename, + op->op_linenum, + 0); /* column */ + @} + +@end example +@end quotation + +Let’s create the function itself. As usual, we create its parameter +first, then use the parameter to create the function: + +@quotation + +@example + state.param_arg = + gcc_jit_context_new_param (state.ctxt, state.op_locs[0], + state.int_type, "arg"); + state.fn = + gcc_jit_context_new_function (state.ctxt, + state.op_locs[0], + GCC_JIT_FUNCTION_EXPORTED, + state.int_type, + funcname, + 1, &state.param_arg, 0); + +@end example +@end quotation + +We create the locals within the function. + +@quotation + +@example + state.stack = + gcc_jit_function_new_local (state.fn, NULL, + state.stack_type, "stack"); + state.stack_depth = + gcc_jit_function_new_local (state.fn, NULL, + state.int_type, "stack_depth"); + state.x = + gcc_jit_function_new_local (state.fn, NULL, + state.int_type, "x"); + state.y = + gcc_jit_function_new_local (state.fn, NULL, + state.int_type, "y"); + +@end example +@end quotation + +@node Populating the function,Verifying the control flow graph,Setting things up,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 populating-the-function}@anchor{3c} +@subsection Populating the function + + +There’s some one-time initialization, and the API treats the first block +you create as the entrypoint of the function, so we need to create that +block first: + +@quotation + +@example + state.initial_block = gcc_jit_function_new_block (state.fn, "initial"); + +@end example +@end quotation + +We can now create blocks for each of the operations. Most of these will +be consolidated into larger blocks when the optimizer runs. + +@quotation + +@example + for (pc = 0; pc < fn->fn_num_ops; pc++) + @{ + char buf[100]; + sprintf (buf, "instr%i", pc); + state.op_blocks[pc] = gcc_jit_function_new_block (state.fn, buf); + @} + +@end example +@end quotation + +Now that we have a block it can jump to when it’s done, we can populate +the initial block: + +@quotation + +@example + + /* "stack_depth = 0;". */ + gcc_jit_block_add_assignment ( + state.initial_block, + state.op_locs[0], + state.stack_depth, + gcc_jit_context_zero (state.ctxt, state.int_type)); + + /* "PUSH (arg);". */ + add_push (&state, + state.initial_block, + gcc_jit_param_as_rvalue (state.param_arg), + state.op_locs[0]); + + /* ...and jump to insn 0. */ + gcc_jit_block_end_with_jump (state.initial_block, + state.op_locs[0], + state.op_blocks[0]); + +@end example +@end quotation + +We can now populate the blocks for the individual operations. We loop +through them, adding instructions to their blocks: + +@quotation + +@example + for (pc = 0; pc < fn->fn_num_ops; pc++) + @{ + gcc_jit_location *loc = state.op_locs[pc]; + + gcc_jit_block *block = state.op_blocks[pc]; + gcc_jit_block *next_block = (pc < fn->fn_num_ops + ? state.op_blocks[pc + 1] + : NULL); + + toyvm_op *op; + op = &fn->fn_ops[pc]; + +@end example +@end quotation + +We’re going to have another big @code{switch} statement for implementing +the opcodes, this time for compiling them, rather than interpreting +them. It’s helpful to have macros for implementing push and pop, so that +we can make the @code{switch} statement that’s coming up look as much as +possible like the one above within the interpreter: + +@example + +#define X_EQUALS_POP()\ + add_pop (&state, block, state.x, loc) +#define Y_EQUALS_POP()\ + add_pop (&state, block, state.y, loc) +#define PUSH_RVALUE(RVALUE)\ + add_push (&state, block, (RVALUE), loc) +#define PUSH_X()\ + PUSH_RVALUE (gcc_jit_lvalue_as_rvalue (state.x)) +#define PUSH_Y() \ + PUSH_RVALUE (gcc_jit_lvalue_as_rvalue (state.y)) + +@end example + +@cartouche +@quotation Note +A particularly clever implementation would have an @emph{identical} +@code{switch} statement shared by the interpreter and the compiler, with +some preprocessor “magic”. We’re not doing that here, for the sake +of simplicity. +@end quotation +@end cartouche + +When I first implemented this compiler, I accidentally missed an edit +when copying and pasting the @code{Y_EQUALS_POP} macro, so that popping the +stack into @code{y} instead erroneously assigned it to @code{x}, leaving @code{y} +uninitialized. + +To track this kind of thing down, we can use +@ref{3d,,gcc_jit_block_add_comment()} to add descriptive comments +to the internal representation. This is invaluable when looking through +the generated IR for, say @code{factorial}: + +@quotation + +@example + + gcc_jit_block_add_comment (block, loc, opcode_names[op->op_opcode]); + +@end example +@end quotation + +We can now write the big @code{switch} statement that implements the +individual opcodes, populating the relevant block with statements: + +@quotation + +@example + + switch (op->op_opcode) + @{ + case DUP: + X_EQUALS_POP (); + PUSH_X (); + PUSH_X (); + break; + + case ROT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_Y (); + PUSH_X (); + break; + + case BINARY_ADD: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + gcc_jit_context_new_binary_op ( + state.ctxt, + loc, + GCC_JIT_BINARY_OP_PLUS, + state.int_type, + gcc_jit_lvalue_as_rvalue (state.x), + gcc_jit_lvalue_as_rvalue (state.y))); + break; + + case BINARY_SUBTRACT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + gcc_jit_context_new_binary_op ( + state.ctxt, + loc, + GCC_JIT_BINARY_OP_MINUS, + state.int_type, + gcc_jit_lvalue_as_rvalue (state.x), + gcc_jit_lvalue_as_rvalue (state.y))); + break; + + case BINARY_MULT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + gcc_jit_context_new_binary_op ( + state.ctxt, + loc, + GCC_JIT_BINARY_OP_MULT, + state.int_type, + gcc_jit_lvalue_as_rvalue (state.x), + gcc_jit_lvalue_as_rvalue (state.y))); + break; + + case BINARY_COMPARE_LT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + /* cast of bool to int */ + gcc_jit_context_new_cast ( + state.ctxt, + loc, + /* (x < y) as a bool */ + gcc_jit_context_new_comparison ( + state.ctxt, + loc, + GCC_JIT_COMPARISON_LT, + gcc_jit_lvalue_as_rvalue (state.x), + gcc_jit_lvalue_as_rvalue (state.y)), + state.int_type)); + break; + + case RECURSE: + @{ + X_EQUALS_POP (); + gcc_jit_rvalue *arg = gcc_jit_lvalue_as_rvalue (state.x); + PUSH_RVALUE ( + gcc_jit_context_new_call ( + state.ctxt, + loc, + state.fn, + 1, &arg)); + break; + @} + + case RETURN: + X_EQUALS_POP (); + gcc_jit_block_end_with_return ( + block, + loc, + gcc_jit_lvalue_as_rvalue (state.x)); + break; + + /* Ops taking an operand. */ + case PUSH_CONST: + PUSH_RVALUE ( + gcc_jit_context_new_rvalue_from_int ( + state.ctxt, + state.int_type, + op->op_operand)); + break; + + case JUMP_ABS_IF_TRUE: + X_EQUALS_POP (); + gcc_jit_block_end_with_conditional ( + block, + loc, + /* "(bool)x". */ + gcc_jit_context_new_cast ( + state.ctxt, + loc, + gcc_jit_lvalue_as_rvalue (state.x), + state.bool_type), + state.op_blocks[op->op_operand], /* on_true */ + next_block); /* on_false */ + break; + + default: + assert(0); + @} /* end of switch on opcode */ + +@end example +@end quotation + +Every block must be terminated, via a call to one of the +@code{gcc_jit_block_end_with_} entrypoints. This has been done for two +of the opcodes, but we need to do it for the other ones, by jumping +to the next block. + +@quotation + +@example + if (op->op_opcode != JUMP_ABS_IF_TRUE + && op->op_opcode != RETURN) + gcc_jit_block_end_with_jump ( + block, + loc, + next_block); + +@end example +@end quotation + +This is analogous to simply incrementing the program counter. + +@node Verifying the control flow graph,Compiling the context,Populating the function,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 verifying-the-control-flow-graph}@anchor{3e} +@subsection Verifying the control flow graph + + +Having finished looping over the blocks, the context is complete. + +As before, we can verify that the control flow and statements are sane by +using @ref{33,,gcc_jit_function_dump_to_dot()}: + +@example +gcc_jit_function_dump_to_dot (state.fn, "/tmp/factorial.dot"); +@end example + +and viewing the result. Note how the label names, comments, and +variable names show up in the dump, to make it easier to spot +errors in our compiler. + +@quotation + + +@float Figure + +@image{libgccjit-figures/factorial1,,,image of a control flow graph,png} + +@end float + +@end quotation + +@node Compiling the context,Single-stepping through the generated code,Verifying the control flow graph,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 compiling-the-context}@anchor{3f} +@subsection Compiling the context + + +Having finished looping over the blocks and populating them with +statements, the context is complete. + +We can now compile it, and extract machine code from the result: + +@quotation +@end quotation + +We can now run the result: + +@quotation + +@example + toyvm_compiled_function *compiled_fn + = toyvm_function_compile (fn); + + toyvm_compiled_code code = compiled_fn->cf_code; + printf ("compiler result: %d\n", + code (atoi (argv[2]))); + + gcc_jit_result_release (compiled_fn->cf_jit_result); + free (compiled_fn); + +@end example +@end quotation + +@node Single-stepping through the generated code,Examining the generated code,Compiling the context,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 single-stepping-through-the-generated-code}@anchor{40} +@subsection Single-stepping through the generated code + + +It’s possible to debug the generated code. To do this we need to both: + +@quotation + + +@itemize * + +@item +Set up source code locations for our statements, so that we can +meaningfully step through the code. We did this above by +calling @ref{41,,gcc_jit_context_new_location()} and using the +results. + +@item +Enable the generation of debugging information, by setting +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} on the +@ref{8,,gcc_jit_context} via +@ref{1b,,gcc_jit_context_set_bool_option()}: + +@example +gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DEBUGINFO, + 1); +@end example +@end itemize +@end quotation + +Having done this, we can put a breakpoint on the generated function: + +@example +$ gdb --args ./toyvm factorial.toy 10 +(gdb) break factorial +Function "factorial" not defined. +Make breakpoint pending on future shared library load? (y or [n]) y +Breakpoint 1 (factorial) pending. +(gdb) run +Breakpoint 1, factorial (arg=10) at factorial.toy:14 +14 DUP +@end example + +We’ve set up location information, which references @code{factorial.toy}. +This allows us to use e.g. @code{list} to see where we are in the script: + +@example +(gdb) list +9 +10 # Initial state: +11 # stack: [arg] +12 +13 # 0: +14 DUP +15 # stack: [arg, arg] +16 +17 # 1: +18 PUSH_CONST 2 +@end example + +and to step through the function, examining the data: + +@example +(gdb) n +18 PUSH_CONST 2 +(gdb) n +22 BINARY_COMPARE_LT +(gdb) print stack +$5 = @{10, 10, 2, 0, -7152, 32767, 0, 0@} +(gdb) print stack_depth +$6 = 3 +@end example + +You’ll see that the parts of the @code{stack} array that haven’t been +touched yet are uninitialized. + +@cartouche +@quotation Note +Turning on optimizations may lead to unpredictable results when +stepping through the generated code: the execution may appear to +“jump around” the source code. This is analogous to turning up the +optimization level in a regular compiler. +@end quotation +@end cartouche + +@node Examining the generated code,Putting it all together,Single-stepping through the generated code,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 examining-the-generated-code}@anchor{43} +@subsection Examining the generated code + + +How good is the optimized code? + +We can turn up optimizations, by calling +@ref{1e,,gcc_jit_context_set_int_option()} with +@ref{1f,,GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL}: + +@example +gcc_jit_context_set_int_option ( + ctxt, + GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, + 3); +@end example + +One of GCC’s internal representations is called “gimple”. A dump of the +initial gimple representation of the code can be seen by setting: + +@example +gcc_jit_context_set_bool_option (ctxt, + GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, + 1); +@end example + +With optimization on and source locations displayed, this gives: + +@c We'll use "c" for gimple dumps + +@example +factorial (signed int arg) +@{ + D.80; + signed int D.81; + signed int D.82; + signed int D.83; + signed int D.84; + signed int D.85; + signed int y; + signed int x; + signed int stack_depth; + signed int stack[8]; + + try + @{ + initial: + stack_depth = 0; + stack[stack_depth] = arg; + stack_depth = stack_depth + 1; + goto instr0; + instr0: + /* DUP */: + stack_depth = stack_depth + -1; + x = stack[stack_depth]; + stack[stack_depth] = x; + stack_depth = stack_depth + 1; + stack[stack_depth] = x; + stack_depth = stack_depth + 1; + goto instr1; + instr1: + /* PUSH_CONST */: + stack[stack_depth] = 2; + stack_depth = stack_depth + 1; + goto instr2; + + /* etc */ +@end example + +You can see the generated machine code in assembly form via: + +@example +gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 1); +result = gcc_jit_context_compile (ctxt); +@end example + +which shows that (on this x86_64 box) the compiler has unrolled the loop +and is using MMX instructions to perform several multiplications +simultaneously: + +@example + .file "fake.c" + .text +.Ltext0: + .p2align 4,,15 + .globl factorial + .type factorial, @@function +factorial: +.LFB0: + .file 1 "factorial.toy" + .loc 1 14 0 + .cfi_startproc +.LVL0: +.L2: + .loc 1 26 0 + cmpl $1, %edi + jle .L13 + leal -1(%rdi), %edx + movl %edx, %ecx + shrl $2, %ecx + leal 0(,%rcx,4), %esi + testl %esi, %esi + je .L14 + cmpl $9, %edx + jbe .L14 + leal -2(%rdi), %eax + movl %eax, -16(%rsp) + leal -3(%rdi), %eax + movd -16(%rsp), %xmm0 + movl %edi, -16(%rsp) + movl %eax, -12(%rsp) + movd -16(%rsp), %xmm1 + xorl %eax, %eax + movl %edx, -16(%rsp) + movd -12(%rsp), %xmm4 + movd -16(%rsp), %xmm6 + punpckldq %xmm4, %xmm0 + movdqa .LC1(%rip), %xmm4 + punpckldq %xmm6, %xmm1 + punpcklqdq %xmm0, %xmm1 + movdqa .LC0(%rip), %xmm0 + jmp .L5 + # etc - edited for brevity +@end example + +This is clearly overkill for a function that will likely overflow the +@code{int} type before the vectorization is worthwhile - but then again, this +is a toy example. + +Turning down the optimization level to 2: + +@example +gcc_jit_context_set_int_option ( + ctxt, + GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, + 3); +@end example + +yields this code, which is simple enough to quote in its entirety: + +@example + .file "fake.c" + .text + .p2align 4,,15 + .globl factorial + .type factorial, @@function +factorial: +.LFB0: + .cfi_startproc +.L2: + cmpl $1, %edi + jle .L8 + movl $1, %edx + jmp .L4 + .p2align 4,,10 + .p2align 3 +.L6: + movl %eax, %edi +.L4: +.L5: + leal -1(%rdi), %eax + imull %edi, %edx + cmpl $1, %eax + jne .L6 +.L3: +.L7: + imull %edx, %eax + ret +.L8: + movl %edi, %eax + movl $1, %edx + jmp .L7 + .cfi_endproc +.LFE0: + .size factorial, .-factorial + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-%@{gcc_release@})" + .section .note.GNU-stack,"",@@progbits +@end example + +Note that the stack pushing and popping have been eliminated, as has the +recursive call (in favor of an iteration). + +@node Putting it all together,Behind the curtain How does our code get optimized?,Examining the generated code,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 putting-it-all-together}@anchor{44} +@subsection Putting it all together + + +The complete example can be seen in the source tree at +@code{gcc/jit/docs/examples/tut04-toyvm/toyvm.c} + +along with a Makefile and a couple of sample .toy scripts: + +@example +$ ls -al +drwxrwxr-x. 2 david david 4096 Sep 19 17:46 . +drwxrwxr-x. 3 david david 4096 Sep 19 15:26 .. +-rw-rw-r--. 1 david david 615 Sep 19 12:43 factorial.toy +-rw-rw-r--. 1 david david 834 Sep 19 13:08 fibonacci.toy +-rw-rw-r--. 1 david david 238 Sep 19 14:22 Makefile +-rw-rw-r--. 1 david david 16457 Sep 19 17:07 toyvm.c + +$ make toyvm +g++ -Wall -g -o toyvm toyvm.c -lgccjit + +$ ./toyvm factorial.toy 10 +interpreter result: 3628800 +compiler result: 3628800 + +$ ./toyvm fibonacci.toy 10 +interpreter result: 55 +compiler result: 55 +@end example + +@node Behind the curtain How does our code get optimized?,,Putting it all together,Tutorial part 4 Adding JIT-compilation to a toy interpreter +@anchor{intro/tutorial04 behind-the-curtain-how-does-our-code-get-optimized}@anchor{45} +@subsection Behind the curtain: How does our code get optimized? + + +Our example is done, but you may be wondering about exactly how the +compiler turned what we gave it into the machine code seen above. + +We can examine what the compiler is doing in detail by setting: + +@example +gcc_jit_context_set_bool_option (state.ctxt, + GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING, + 1); +gcc_jit_context_set_bool_option (state.ctxt, + GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES, + 1); +@end example + +This will dump detailed information about the compiler’s state to a +directory under @code{/tmp}, and keep it from being cleaned up. + +The precise names and their formats of these files is subject to change. +Higher optimization levels lead to more files. +Here’s what I saw (edited for brevity; there were almost 200 files): + +@example +intermediate files written to /tmp/libgccjit-KPQbGw +$ ls /tmp/libgccjit-KPQbGw/ +fake.c.000i.cgraph +fake.c.000i.type-inheritance +fake.c.004t.gimple +fake.c.007t.omplower +fake.c.008t.lower +fake.c.011t.eh +fake.c.012t.cfg +fake.c.014i.visibility +fake.c.015i.early_local_cleanups +fake.c.016t.ssa +# etc +@end example + +The gimple code is converted into Static Single Assignment form, +with annotations for use when generating the debuginfo: + +@example +$ less /tmp/libgccjit-KPQbGw/fake.c.016t.ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + signed int _56; + +initial: + stack_depth_3 = 0; + # DEBUG stack_depth => stack_depth_3 + stack[stack_depth_3] = arg_5(D); + stack_depth_7 = stack_depth_3 + 1; + # DEBUG stack_depth => stack_depth_7 + # DEBUG instr0 => NULL + # DEBUG /* DUP */ => NULL + stack_depth_8 = stack_depth_7 + -1; + # DEBUG stack_depth => stack_depth_8 + x_9 = stack[stack_depth_8]; + # DEBUG x => x_9 + stack[stack_depth_8] = x_9; + stack_depth_11 = stack_depth_8 + 1; + # DEBUG stack_depth => stack_depth_11 + stack[stack_depth_11] = x_9; + stack_depth_13 = stack_depth_11 + 1; + # DEBUG stack_depth => stack_depth_13 + # DEBUG instr1 => NULL + # DEBUG /* PUSH_CONST */ => NULL + stack[stack_depth_13] = 2; + + /* etc; edited for brevity */ +@end example + +We can perhaps better see the code by turning off +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} to suppress all those @code{DEBUG} +statements, giving: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.016t.ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + signed int _56; + +initial: + stack_depth_3 = 0; + stack[stack_depth_3] = arg_5(D); + stack_depth_7 = stack_depth_3 + 1; + stack_depth_8 = stack_depth_7 + -1; + x_9 = stack[stack_depth_8]; + stack[stack_depth_8] = x_9; + stack_depth_11 = stack_depth_8 + 1; + stack[stack_depth_11] = x_9; + stack_depth_13 = stack_depth_11 + 1; + stack[stack_depth_13] = 2; + stack_depth_15 = stack_depth_13 + 1; + stack_depth_16 = stack_depth_15 + -1; + y_17 = stack[stack_depth_16]; + stack_depth_18 = stack_depth_16 + -1; + x_19 = stack[stack_depth_18]; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack[stack_depth_18] = _21; + stack_depth_23 = stack_depth_18 + 1; + stack_depth_24 = stack_depth_23 + -1; + x_25 = stack[stack_depth_24]; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + stack_depth_26 = stack_depth_24 + -1; + x_27 = stack[stack_depth_26]; + stack[stack_depth_26] = x_27; + stack_depth_29 = stack_depth_26 + 1; + stack[stack_depth_29] = x_27; + stack_depth_31 = stack_depth_29 + 1; + stack[stack_depth_31] = 1; + stack_depth_33 = stack_depth_31 + 1; + stack_depth_34 = stack_depth_33 + -1; + y_35 = stack[stack_depth_34]; + stack_depth_36 = stack_depth_34 + -1; + x_37 = stack[stack_depth_36]; + _38 = x_37 - y_35; + stack[stack_depth_36] = _38; + stack_depth_40 = stack_depth_36 + 1; + stack_depth_41 = stack_depth_40 + -1; + x_42 = stack[stack_depth_41]; + _44 = factorial (x_42); + stack[stack_depth_41] = _44; + stack_depth_46 = stack_depth_41 + 1; + stack_depth_47 = stack_depth_46 + -1; + y_48 = stack[stack_depth_47]; + stack_depth_49 = stack_depth_47 + -1; + x_50 = stack[stack_depth_49]; + _51 = x_50 * y_48; + stack[stack_depth_49] = _51; + stack_depth_53 = stack_depth_49 + 1; + + # stack_depth_1 = PHI +instr9: +/* RETURN */: + stack_depth_54 = stack_depth_1 + -1; + x_55 = stack[stack_depth_54]; + _56 = x_55; + stack =@{v@} @{CLOBBER@}; + return _56; + +@} +@end example + +Note in the above how all the @ref{28,,gcc_jit_block} instances we +created have been consolidated into just 3 blocks in GCC’s internal +representation: @code{initial}, @code{instr4} and @code{instr9}. + +@menu +* Optimizing away stack manipulation:: +* Elimination of tail recursion:: + +@end menu + +@node Optimizing away stack manipulation,Elimination of tail recursion,,Behind the curtain How does our code get optimized? +@anchor{intro/tutorial04 optimizing-away-stack-manipulation}@anchor{46} +@subsubsection Optimizing away stack manipulation + + +Recall our simple implementation of stack operations. Let’s examine +how the stack operations are optimized away. + +After a pass of constant-propagation, the depth of the stack at each +opcode can be determined at compile-time: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.021t.ccp1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack[0] = arg_5(D); + x_9 = stack[0]; + stack[0] = x_9; + stack[1] = x_9; + stack[2] = 2; + y_17 = stack[2]; + x_19 = stack[1]; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack[1] = _21; + x_25 = stack[1]; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + x_27 = stack[0]; + stack[0] = x_27; + stack[1] = x_27; + stack[2] = 1; + y_35 = stack[2]; + x_37 = stack[1]; + _38 = x_37 - y_35; + stack[1] = _38; + x_42 = stack[1]; + _44 = factorial (x_42); + stack[1] = _44; + y_48 = stack[1]; + x_50 = stack[0]; + _51 = x_50 * y_48; + stack[0] = _51; + +instr9: +/* RETURN */: + x_55 = stack[0]; + x_56 = x_55; + stack =@{v@} @{CLOBBER@}; + return x_56; + +@} +@end example + +Note how, in the above, all those @code{stack_depth} values are now just +constants: we’re accessing specific stack locations at each opcode. + +The “esra” pass (“Early Scalar Replacement of Aggregates”) breaks +out our “stack” array into individual elements: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.024t.esra +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +Created a replacement for stack offset: 0, size: 32: stack$0 +Created a replacement for stack offset: 32, size: 32: stack$1 +Created a replacement for stack offset: 64, size: 32: stack$2 + +Symbols to be put in SSA form +@{ D.89 D.90 D.91 @} +Incremental SSA update started at block: 0 +Number of blocks in CFG: 5 +Number of blocks to update: 4 ( 80%) + + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack$0_45 = arg_5(D); + x_9 = stack$0_45; + stack$0_39 = x_9; + stack$1_32 = x_9; + stack$2_30 = 2; + y_17 = stack$2_30; + x_19 = stack$1_32; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack$1_28 = _21; + x_25 = stack$1_28; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + x_27 = stack$0_39; + stack$0_22 = x_27; + stack$1_14 = x_27; + stack$2_12 = 1; + y_35 = stack$2_12; + x_37 = stack$1_14; + _38 = x_37 - y_35; + stack$1_10 = _38; + x_42 = stack$1_10; + _44 = factorial (x_42); + stack$1_6 = _44; + y_48 = stack$1_6; + x_50 = stack$0_22; + _51 = x_50 * y_48; + stack$0_1 = _51; + + # stack$0_52 = PHI +instr9: +/* RETURN */: + x_55 = stack$0_52; + x_56 = x_55; + stack =@{v@} @{CLOBBER@}; + return x_56; + +@} +@end example + +Hence at this point, all those pushes and pops of the stack are now +simply assignments to specific temporary variables. + +After some copy propagation, the stack manipulation has been completely +optimized away: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.026t.copyprop1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack$0_39 = arg_5(D); + _20 = arg_5(D) <= 1; + _21 = (signed int) _20; + if (_21 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _38 = arg_5(D) + -1; + _44 = factorial (_38); + _51 = arg_5(D) * _44; + stack$0_1 = _51; + + # stack$0_52 = PHI +instr9: +/* RETURN */: + stack =@{v@} @{CLOBBER@}; + return stack$0_52; + +@} +@end example + +Later on, another pass finally eliminated @code{stack_depth} local and the +unused parts of the @cite{stack`} array altogether: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.036t.release_ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +Released 44 names, 314.29%, removed 44 holes +factorial (signed int arg) +@{ + signed int stack$0; + signed int mult_acc_1; + _5; + signed int _6; + signed int _7; + signed int mul_tmp_10; + signed int mult_acc_11; + signed int mult_acc_13; + + # arg_9 = PHI + # mult_acc_13 = PHI <1(0)> +initial: + + : + # arg_4 = PHI + # mult_acc_1 = PHI + _5 = arg_4 <= 1; + _6 = (signed int) _5; + if (_6 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _7 = arg_4 + -1; + mult_acc_11 = mult_acc_1 * arg_4; + goto ; + + # stack$0_12 = PHI +instr9: +/* RETURN */: + mul_tmp_10 = mult_acc_1 * stack$0_12; + return mul_tmp_10; + +@} +@end example + +@node Elimination of tail recursion,,Optimizing away stack manipulation,Behind the curtain How does our code get optimized? +@anchor{intro/tutorial04 elimination-of-tail-recursion}@anchor{47} +@subsubsection Elimination of tail recursion + + +Another significant optimization is the detection that the call to +@code{factorial} is tail recursion, which can be eliminated in favor of +an iteration: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.030t.tailr1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + + +Symbols to be put in SSA form +@{ D.88 @} +Incremental SSA update started at block: 0 +Number of blocks in CFG: 5 +Number of blocks to update: 4 ( 80%) + + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + signed int mult_acc_1; + _20; + signed int _21; + signed int _38; + signed int mul_tmp_44; + signed int mult_acc_51; + + # arg_5 = PHI + # mult_acc_1 = PHI <1(0), mult_acc_51(3)> +initial: + _20 = arg_5 <= 1; + _21 = (signed int) _20; + if (_21 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _38 = arg_5 + -1; + mult_acc_51 = mult_acc_1 * arg_5; + goto (initial); + + # stack$0_52 = PHI +instr9: +/* RETURN */: + stack =@{v@} @{CLOBBER@}; + mul_tmp_44 = mult_acc_1 * stack$0_52; + return mul_tmp_44; + +@} +@end example + +@c Copyright (C) 2015-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 5 Implementing an Ahead-of-Time compiler,,Tutorial part 4 Adding JIT-compilation to a toy interpreter,Tutorial +@anchor{intro/tutorial05 doc}@anchor{48}@anchor{intro/tutorial05 tutorial-part-5-implementing-an-ahead-of-time-compiler}@anchor{49} +@section Tutorial part 5: Implementing an Ahead-of-Time compiler + + +If you have a pre-existing language frontend that’s compatible with +libgccjit’s license, it’s possible to hook it up to libgccjit as a +backend. In the previous example we showed +how to do that for in-memory JIT-compilation, but libgccjit can also +compile code directly to a file, allowing you to implement a more +traditional ahead-of-time compiler (“JIT” is something of a misnomer +for this use-case). + +The essential difference is to compile the context using +@ref{4a,,gcc_jit_context_compile_to_file()} rather than +@ref{15,,gcc_jit_context_compile()}. + +@menu +* The “brainf” language:: +* Converting a brainf script to libgccjit IR:: +* Compiling a context to a file:: +* Other forms of ahead-of-time-compilation:: + +@end menu + +@node The “brainf” language,Converting a brainf script to libgccjit IR,,Tutorial part 5 Implementing an Ahead-of-Time compiler +@anchor{intro/tutorial05 the-brainf-language}@anchor{4b} +@subsection The “brainf” language + + +In this example we use libgccjit to construct an ahead-of-time compiler +for an esoteric programming language that we shall refer to as “brainf”. + +brainf scripts operate on an array of bytes, with a notional data pointer +within the array. + +brainf is hard for humans to read, but it’s trivial to write a parser for +it, as there is no lexing; just a stream of bytes. The operations are: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} +@headitem + +Character + +@tab + +Meaning + +@item + +@code{>} + +@tab + +@code{idx += 1} + +@item + +@code{<} + +@tab + +@code{idx -= 1} + +@item + +@code{+} + +@tab + +@code{data[idx] += 1} + +@item + +@code{-} + +@tab + +@code{data[idx] -= 1} + +@item + +@code{.} + +@tab + +@code{output (data[idx])} + +@item + +@code{,} + +@tab + +@code{data[idx] = input ()} + +@item + +@code{[} + +@tab + +loop until @code{data[idx] == 0} + +@item + +@code{]} + +@tab + +end of loop + +@item + +Anything else + +@tab + +ignored + +@end multitable + + +Unlike the previous example, we’ll implement an ahead-of-time compiler, +which reads @code{.bf} scripts and outputs executables (though it would +be trivial to have it run them JIT-compiled in-process). + +Here’s what a simple @code{.bf} script looks like: + +@quotation + +@example +[ + Emit the uppercase alphabet +] + +cell 0 = 26 +++++++++++++++++++++++++++ + +cell 1 = 65 +>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< + +while cell#0 != 0 +[ + > + . emit cell#1 + + increment cell@@1 + <- decrement cell@@0 +] +@end example +@end quotation + +@cartouche +@quotation Note +This example makes use of whitespace and comments for legibility, but +could have been written as: + +@example +++++++++++++++++++++++++++ +>+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< +[>.+<-] +@end example + +It’s not a particularly useful language, except for providing +compiler-writers with a test case that’s easy to parse. The point +is that you can use @ref{4a,,gcc_jit_context_compile_to_file()} +to use libgccjit as a backend for a pre-existing language frontend +(provided that the pre-existing frontend is compatible with libgccjit’s +license). +@end quotation +@end cartouche + +@node Converting a brainf script to libgccjit IR,Compiling a context to a file,The “brainf” language,Tutorial part 5 Implementing an Ahead-of-Time compiler +@anchor{intro/tutorial05 converting-a-brainf-script-to-libgccjit-ir}@anchor{4c} +@subsection Converting a brainf script to libgccjit IR + + +As before we write simple code to populate a @ref{8,,gcc_jit_context *}. + +@quotation + +@example + +typedef struct bf_compiler +@{ + const char *filename; + int line; + int column; + + gcc_jit_context *ctxt; + + gcc_jit_type *void_type; + gcc_jit_type *int_type; + gcc_jit_type *byte_type; + gcc_jit_type *array_type; + + gcc_jit_function *func_getchar; + gcc_jit_function *func_putchar; + + gcc_jit_function *func; + gcc_jit_block *curblock; + + gcc_jit_rvalue *int_zero; + gcc_jit_rvalue *int_one; + gcc_jit_rvalue *byte_zero; + gcc_jit_rvalue *byte_one; + gcc_jit_lvalue *data_cells; + gcc_jit_lvalue *idx; + + int num_open_parens; + gcc_jit_block *paren_test[MAX_OPEN_PARENS]; + gcc_jit_block *paren_body[MAX_OPEN_PARENS]; + gcc_jit_block *paren_after[MAX_OPEN_PARENS]; + +@} bf_compiler; + +/* Bail out, with a message on stderr. */ + +static void +fatal_error (bf_compiler *bfc, const char *msg) +@{ + fprintf (stderr, + "%s:%i:%i: %s", + bfc->filename, bfc->line, bfc->column, msg); + abort (); +@} + +/* Get "data_cells[idx]" as an lvalue. */ + +static gcc_jit_lvalue * +bf_get_current_data (bf_compiler *bfc, gcc_jit_location *loc) +@{ + return gcc_jit_context_new_array_access ( + bfc->ctxt, + loc, + gcc_jit_lvalue_as_rvalue (bfc->data_cells), + gcc_jit_lvalue_as_rvalue (bfc->idx)); +@} + +/* Get "data_cells[idx] == 0" as a boolean rvalue. */ + +static gcc_jit_rvalue * +bf_current_data_is_zero (bf_compiler *bfc, gcc_jit_location *loc) +@{ + return gcc_jit_context_new_comparison ( + bfc->ctxt, + loc, + GCC_JIT_COMPARISON_EQ, + gcc_jit_lvalue_as_rvalue (bf_get_current_data (bfc, loc)), + bfc->byte_zero); +@} + +/* Compile one bf character. */ + +static void +bf_compile_char (bf_compiler *bfc, + unsigned char ch) +@{ + gcc_jit_location *loc = + gcc_jit_context_new_location (bfc->ctxt, + bfc->filename, + bfc->line, + bfc->column); + + /* Turn this on to trace execution, by injecting putchar () + of each source char. */ + if (0) + @{ + gcc_jit_rvalue *arg = + gcc_jit_context_new_rvalue_from_int ( + bfc->ctxt, + bfc->int_type, + ch); + gcc_jit_rvalue *call = + gcc_jit_context_new_call (bfc->ctxt, + loc, + bfc->func_putchar, + 1, &arg); + gcc_jit_block_add_eval (bfc->curblock, + loc, + call); + @} + + switch (ch) + @{ + case '>': + gcc_jit_block_add_comment (bfc->curblock, + loc, + "'>': idx += 1;"); + gcc_jit_block_add_assignment_op (bfc->curblock, + loc, + bfc->idx, + GCC_JIT_BINARY_OP_PLUS, + bfc->int_one); + break; + + case '<': + gcc_jit_block_add_comment (bfc->curblock, + loc, + "'<': idx -= 1;"); + gcc_jit_block_add_assignment_op (bfc->curblock, + loc, + bfc->idx, + GCC_JIT_BINARY_OP_MINUS, + bfc->int_one); + break; + + case '+': + gcc_jit_block_add_comment (bfc->curblock, + loc, + "'+': data[idx] += 1;"); + gcc_jit_block_add_assignment_op (bfc->curblock, + loc, + bf_get_current_data (bfc, loc), + GCC_JIT_BINARY_OP_PLUS, + bfc->byte_one); + break; + + case '-': + gcc_jit_block_add_comment (bfc->curblock, + loc, + "'-': data[idx] -= 1;"); + gcc_jit_block_add_assignment_op (bfc->curblock, + loc, + bf_get_current_data (bfc, loc), + GCC_JIT_BINARY_OP_MINUS, + bfc->byte_one); + break; + + case '.': + @{ + gcc_jit_rvalue *arg = + gcc_jit_context_new_cast ( + bfc->ctxt, + loc, + gcc_jit_lvalue_as_rvalue (bf_get_current_data (bfc, loc)), + bfc->int_type); + gcc_jit_rvalue *call = + gcc_jit_context_new_call (bfc->ctxt, + loc, + bfc->func_putchar, + 1, &arg); + gcc_jit_block_add_comment (bfc->curblock, + loc, + "'.': putchar ((int)data[idx]);"); + gcc_jit_block_add_eval (bfc->curblock, + loc, + call); + @} + break; + + case ',': + @{ + gcc_jit_rvalue *call = + gcc_jit_context_new_call (bfc->ctxt, + loc, + bfc->func_getchar, + 0, NULL); + gcc_jit_block_add_comment ( + bfc->curblock, + loc, + "',': data[idx] = (unsigned char)getchar ();"); + gcc_jit_block_add_assignment (bfc->curblock, + loc, + bf_get_current_data (bfc, loc), + gcc_jit_context_new_cast ( + bfc->ctxt, + loc, + call, + bfc->byte_type)); + @} + break; + + case '[': + @{ + gcc_jit_block *loop_test = + gcc_jit_function_new_block (bfc->func, NULL); + gcc_jit_block *on_zero = + gcc_jit_function_new_block (bfc->func, NULL); + gcc_jit_block *on_non_zero = + gcc_jit_function_new_block (bfc->func, NULL); + + if (bfc->num_open_parens == MAX_OPEN_PARENS) + fatal_error (bfc, "too many open parens"); + + gcc_jit_block_end_with_jump ( + bfc->curblock, + loc, + loop_test); + + gcc_jit_block_add_comment ( + loop_test, + loc, + "'['"); + gcc_jit_block_end_with_conditional ( + loop_test, + loc, + bf_current_data_is_zero (bfc, loc), + on_zero, + on_non_zero); + bfc->paren_test[bfc->num_open_parens] = loop_test; + bfc->paren_body[bfc->num_open_parens] = on_non_zero; + bfc->paren_after[bfc->num_open_parens] = on_zero; + bfc->num_open_parens += 1; + bfc->curblock = on_non_zero; + @} + break; + + case ']': + @{ + gcc_jit_block_add_comment ( + bfc->curblock, + loc, + "']'"); + + if (bfc->num_open_parens == 0) + fatal_error (bfc, "mismatching parens"); + bfc->num_open_parens -= 1; + gcc_jit_block_end_with_jump ( + bfc->curblock, + loc, + bfc->paren_test[bfc->num_open_parens]); + bfc->curblock = bfc->paren_after[bfc->num_open_parens]; + @} + break; + + case '\n': + bfc->line +=1; + bfc->column = 0; + break; + @} + + if (ch != '\n') + bfc->column += 1; +@} + +/* Compile the given .bf file into a gcc_jit_context, containing a + single "main" function suitable for compiling into an executable. */ + +gcc_jit_context * +bf_compile (const char *filename) +@{ + bf_compiler bfc; + FILE *f_in; + int ch; + + memset (&bfc, 0, sizeof (bfc)); + + bfc.filename = filename; + f_in = fopen (filename, "r"); + if (!f_in) + fatal_error (&bfc, "unable to open file"); + bfc.line = 1; + + bfc.ctxt = gcc_jit_context_acquire (); + + gcc_jit_context_set_int_option ( + bfc.ctxt, + GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, + 3); + gcc_jit_context_set_bool_option ( + bfc.ctxt, + GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, + 0); + gcc_jit_context_set_bool_option ( + bfc.ctxt, + GCC_JIT_BOOL_OPTION_DEBUGINFO, + 1); + gcc_jit_context_set_bool_option ( + bfc.ctxt, + GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING, + 0); + gcc_jit_context_set_bool_option ( + bfc.ctxt, + GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES, + 0); + + bfc.void_type = + gcc_jit_context_get_type (bfc.ctxt, GCC_JIT_TYPE_VOID); + bfc.int_type = + gcc_jit_context_get_type (bfc.ctxt, GCC_JIT_TYPE_INT); + bfc.byte_type = + gcc_jit_context_get_type (bfc.ctxt, GCC_JIT_TYPE_UNSIGNED_CHAR); + bfc.array_type = + gcc_jit_context_new_array_type (bfc.ctxt, + NULL, + bfc.byte_type, + 30000); + + bfc.func_getchar = + gcc_jit_context_new_function (bfc.ctxt, NULL, + GCC_JIT_FUNCTION_IMPORTED, + bfc.int_type, + "getchar", + 0, NULL, + 0); + + gcc_jit_param *param_c = + gcc_jit_context_new_param (bfc.ctxt, NULL, bfc.int_type, "c"); + bfc.func_putchar = + gcc_jit_context_new_function (bfc.ctxt, NULL, + GCC_JIT_FUNCTION_IMPORTED, + bfc.void_type, + "putchar", + 1, ¶m_c, + 0); + + bfc.func = make_main (bfc.ctxt); + bfc.curblock = + gcc_jit_function_new_block (bfc.func, "initial"); + bfc.int_zero = gcc_jit_context_zero (bfc.ctxt, bfc.int_type); + bfc.int_one = gcc_jit_context_one (bfc.ctxt, bfc.int_type); + bfc.byte_zero = gcc_jit_context_zero (bfc.ctxt, bfc.byte_type); + bfc.byte_one = gcc_jit_context_one (bfc.ctxt, bfc.byte_type); + + bfc.data_cells = + gcc_jit_context_new_global (bfc.ctxt, NULL, + GCC_JIT_GLOBAL_INTERNAL, + bfc.array_type, + "data_cells"); + bfc.idx = + gcc_jit_function_new_local (bfc.func, NULL, + bfc.int_type, + "idx"); + + gcc_jit_block_add_comment (bfc.curblock, + NULL, + "idx = 0;"); + gcc_jit_block_add_assignment (bfc.curblock, + NULL, + bfc.idx, + bfc.int_zero); + + bfc.num_open_parens = 0; + + while ( EOF != (ch = fgetc (f_in))) + bf_compile_char (&bfc, (unsigned char)ch); + + gcc_jit_block_end_with_return (bfc.curblock, NULL, bfc.int_zero); + + fclose (f_in); + + return bfc.ctxt; +@} + +@end example +@end quotation + +@node Compiling a context to a file,Other forms of ahead-of-time-compilation,Converting a brainf script to libgccjit IR,Tutorial part 5 Implementing an Ahead-of-Time compiler +@anchor{intro/tutorial05 compiling-a-context-to-a-file}@anchor{4d} +@subsection Compiling a context to a file + + +Unlike the previous tutorial, this time we’ll compile the context +directly to an executable, using @ref{4a,,gcc_jit_context_compile_to_file()}: + +@example +gcc_jit_context_compile_to_file (ctxt, + GCC_JIT_OUTPUT_KIND_EXECUTABLE, + output_file); +@end example + +Here’s the top-level of the compiler, which is what actually calls into +@ref{4a,,gcc_jit_context_compile_to_file()}: + +@quotation + +@example + +int +main (int argc, char **argv) +@{ + const char *input_file; + const char *output_file; + gcc_jit_context *ctxt; + const char *err; + + if (argc != 3) + @{ + fprintf (stderr, "%s: INPUT_FILE OUTPUT_FILE\n", argv[0]); + return 1; + @} + + input_file = argv[1]; + output_file = argv[2]; + ctxt = bf_compile (input_file); + + gcc_jit_context_compile_to_file (ctxt, + GCC_JIT_OUTPUT_KIND_EXECUTABLE, + output_file); + + err = gcc_jit_context_get_first_error (ctxt); + + if (err) + @{ + gcc_jit_context_release (ctxt); + return 1; + @} + + gcc_jit_context_release (ctxt); + return 0; +@} + +@end example +@end quotation + +Note how once the context is populated you could trivially instead compile +it to memory using @ref{15,,gcc_jit_context_compile()} and run it in-process +as in the previous tutorial. + +To create an executable, we need to export a @code{main} function. Here’s +how to create one from the JIT API: + +@quotation + +@example + +/* Make "main" function: + int + main (int argc, char **argv) + @{ + ... + @} +*/ +static gcc_jit_function * +make_main (gcc_jit_context *ctxt) +@{ + gcc_jit_type *int_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + gcc_jit_param *param_argc = + gcc_jit_context_new_param (ctxt, NULL, int_type, "argc"); + gcc_jit_type *char_ptr_ptr_type = + gcc_jit_type_get_pointer ( + gcc_jit_type_get_pointer ( + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_CHAR))); + gcc_jit_param *param_argv = + gcc_jit_context_new_param (ctxt, NULL, char_ptr_ptr_type, "argv"); + gcc_jit_param *params[2] = @{param_argc, param_argv@}; + gcc_jit_function *func_main = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + int_type, + "main", + 2, params, + 0); + return func_main; +@} + +@end example +@end quotation + +@cartouche +@quotation Note +The above implementation ignores @code{argc} and @code{argv}, but you could +make use of them by exposing @code{param_argc} and @code{param_argv} to the +caller. +@end quotation +@end cartouche + +Upon compiling this C code, we obtain a bf-to-machine-code compiler; +let’s call it @code{bfc}: + +@example +$ gcc \ + tut05-bf.c \ + -o bfc \ + -lgccjit +@end example + +We can now use @code{bfc} to compile .bf files into machine code executables: + +@example +$ ./bfc \ + emit-alphabet.bf \ + a.out +@end example + +which we can run directly: + +@example +$ ./a.out +ABCDEFGHIJKLMNOPQRSTUVWXYZ +@end example + +Success! + +We can also inspect the generated executable using standard tools: + +@example +$ objdump -d a.out |less +@end example + +which shows that libgccjit has managed to optimize the function +somewhat (for example, the runs of 26 and 65 increment operations +have become integer constants 0x1a and 0x41): + +@example +0000000000400620
: + 400620: 80 3d 39 0a 20 00 00 cmpb $0x0,0x200a39(%rip) # 601060 + 40062b: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) + 400630: 48 83 ec 08 sub $0x8,%rsp + 400634: 0f b6 05 26 0a 20 00 movzbl 0x200a26(%rip),%eax # 601061 + 40063b: c6 05 1e 0a 20 00 1a movb $0x1a,0x200a1e(%rip) # 601060 + 400642: 8d 78 41 lea 0x41(%rax),%edi + 400645: 40 88 3d 15 0a 20 00 mov %dil,0x200a15(%rip) # 601061 + 40064c: 0f 1f 40 00 nopl 0x0(%rax) + 400650: 40 0f b6 ff movzbl %dil,%edi + 400654: e8 87 fe ff ff callq 4004e0 + 400659: 0f b6 05 01 0a 20 00 movzbl 0x200a01(%rip),%eax # 601061 + 400660: 80 2d f9 09 20 00 01 subb $0x1,0x2009f9(%rip) # 601060 + 400667: 8d 78 01 lea 0x1(%rax),%edi + 40066a: 40 88 3d f0 09 20 00 mov %dil,0x2009f0(%rip) # 601061 + 400671: 75 dd jne 400650 + 400673: 31 c0 xor %eax,%eax + 400675: 48 83 c4 08 add $0x8,%rsp + 400679: c3 retq + 40067a: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) +@end example + +We also set up debugging information (via +@ref{41,,gcc_jit_context_new_location()} and +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO}), so it’s possible to use @code{gdb} +to singlestep through the generated binary and inspect the internal +state @code{idx} and @code{data_cells}: + +@example +(gdb) break main +Breakpoint 1 at 0x400790 +(gdb) run +Starting program: a.out + +Breakpoint 1, 0x0000000000400790 in main (argc=1, argv=0x7fffffffe448) +(gdb) stepi +0x0000000000400797 in main (argc=1, argv=0x7fffffffe448) +(gdb) stepi +0x00000000004007a0 in main (argc=1, argv=0x7fffffffe448) +(gdb) stepi +9 >+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< +(gdb) list +4 +5 cell 0 = 26 +6 ++++++++++++++++++++++++++ +7 +8 cell 1 = 65 +9 >+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< +10 +11 while cell#0 != 0 +12 [ +13 > +(gdb) n +6 ++++++++++++++++++++++++++ +(gdb) n +9 >+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< +(gdb) p idx +$1 = 1 +(gdb) p data_cells +$2 = "\032", '\000' +(gdb) p data_cells[0] +$3 = 26 '\032' +(gdb) p data_cells[1] +$4 = 0 '\000' +(gdb) list +4 +5 cell 0 = 26 +6 ++++++++++++++++++++++++++ +7 +8 cell 1 = 65 +9 >+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++< +10 +11 while cell#0 != 0 +12 [ +13 > +@end example + +@node Other forms of ahead-of-time-compilation,,Compiling a context to a file,Tutorial part 5 Implementing an Ahead-of-Time compiler +@anchor{intro/tutorial05 other-forms-of-ahead-of-time-compilation}@anchor{4e} +@subsection Other forms of ahead-of-time-compilation + + +The above demonstrates compiling a @ref{8,,gcc_jit_context *} directly +to an executable. It’s also possible to compile it to an object file, +and to a dynamic library. See the documentation of +@ref{4a,,gcc_jit_context_compile_to_file()} for more information. + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Topic Reference,C++ bindings for libgccjit,Tutorial,Top +@anchor{topics/index doc}@anchor{4f}@anchor{topics/index topic-reference}@anchor{50} +@chapter Topic Reference + + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Compilation contexts:: +* Objects:: +* Types:: +* Expressions:: +* Creating and using functions:: +* Function pointers: Function pointers<2>. +* Source Locations:: +* Compiling a context:: +* ABI and API compatibility:: +* Performance:: +* Using Assembly Language with libgccjit:: + +@end menu + +@node Compilation contexts,Objects,,Topic Reference +@anchor{topics/contexts doc}@anchor{51}@anchor{topics/contexts compilation-contexts}@anchor{52} +@section Compilation contexts + + +@geindex gcc_jit_context (C type) +@anchor{topics/contexts c gcc_jit_context}@anchor{8} +@deffn {C Type} gcc_jit_context +@end deffn + +The top-level of the API is the @ref{8,,gcc_jit_context} type. + +A @ref{8,,gcc_jit_context} instance encapsulates the state of a +compilation. + +You can set up options on it, and add types, functions and code. +Invoking @ref{15,,gcc_jit_context_compile()} on it gives you a +@ref{16,,gcc_jit_result}. + +@menu +* Lifetime-management:: +* Thread-safety:: +* Error-handling: Error-handling<2>. +* Debugging:: +* Options: Options<2>. + +@end menu + +@node Lifetime-management,Thread-safety,,Compilation contexts +@anchor{topics/contexts lifetime-management}@anchor{53} +@subsection Lifetime-management + + +Contexts are the unit of lifetime-management within the API: objects +have their lifetime bounded by the context they are created within, and +cleanup of such objects is done for you when the context is released. + +@geindex gcc_jit_context_acquire (C function) +@anchor{topics/contexts c gcc_jit_context_acquire}@anchor{9} +@deffn {C Function} gcc_jit_context *gcc_jit_context_acquire (void) + +This function acquires a new @ref{8,,gcc_jit_context *} instance, +which is independent of any others that may be present within this +process. +@end deffn + +@geindex gcc_jit_context_release (C function) +@anchor{topics/contexts c gcc_jit_context_release}@anchor{c} +@deffn {C Function} void gcc_jit_context_release (gcc_jit_context@w{ }*ctxt) + +This function releases all resources associated with the given context. +Both the context itself and all of its @ref{e,,gcc_jit_object *} +instances are cleaned up. It should be called exactly once on a given +context. + +It is invalid to use the context or any of its “contextual” objects +after calling this. + +@example +gcc_jit_context_release (ctxt); +@end example +@end deffn + +@geindex gcc_jit_context_new_child_context (C function) +@anchor{topics/contexts c gcc_jit_context_new_child_context}@anchor{54} +@deffn {C Function} gcc_jit_context * gcc_jit_context_new_child_context (gcc_jit_context@w{ }*parent_ctxt) + +Given an existing JIT context, create a child context. + +The child inherits a copy of all option-settings from the parent. + +The child can reference objects created within the parent, but not +vice-versa. + +The lifetime of the child context must be bounded by that of the +parent: you should release a child context before releasing the parent +context. + +If you use a function from a parent context within a child context, +you have to compile the parent context before you can compile the +child context, and the gcc_jit_result of the parent context must +outlive the gcc_jit_result of the child context. + +This allows caching of shared initializations. For example, you could +create types and declarations of global functions in a parent context +once within a process, and then create child contexts whenever a +function or loop becomes hot. Each such child context can be used for +JIT-compiling just one function or loop, but can reference types +and helper functions created within the parent context. + +Contexts can be arbitrarily nested, provided the above rules are +followed, but it’s probably not worth going above 2 or 3 levels, and +there will likely be a performance hit for such nesting. +@end deffn + +@node Thread-safety,Error-handling<2>,Lifetime-management,Compilation contexts +@anchor{topics/contexts thread-safety}@anchor{55} +@subsection Thread-safety + + +Instances of @ref{8,,gcc_jit_context *} created via +@ref{9,,gcc_jit_context_acquire()} are independent from each other: +only one thread may use a given context at once, but multiple threads +could each have their own contexts without needing locks. + +Contexts created via @ref{54,,gcc_jit_context_new_child_context()} are +related to their parent context. They can be partitioned by their +ultimate ancestor into independent “family trees”. Only one thread +within a process may use a given “family tree” of such contexts at once, +and if you’re using multiple threads you should provide your own locking +around entire such context partitions. + +@node Error-handling<2>,Debugging,Thread-safety,Compilation contexts +@anchor{topics/contexts error-handling}@anchor{19}@anchor{topics/contexts id1}@anchor{56} +@subsection Error-handling + + +Various kinds of errors are possible when using the API, such as +mismatched types in an assignment. You can only compile and get code from +a context if no errors occur. + +Errors are printed on stderr and can be queried using +@ref{57,,gcc_jit_context_get_first_error()}. + +They typically contain the name of the API entrypoint where the error +occurred, and pertinent information on the problem: + +@example +./buggy-program: error: gcc_jit_block_add_assignment: mismatching types: assignment to i (type: int) from "hello world" (type: const char *) +@end example + +In general, if an error occurs when using an API entrypoint, the +entrypoint returns NULL. You don’t have to check everywhere for NULL +results, since the API handles a NULL being passed in for any +argument by issuing another error. This typically leads to a cascade of +followup error messages, but is safe (albeit verbose). The first error +message is usually the one to pay attention to, since it is likely to +be responsible for all of the rest: + +@geindex gcc_jit_context_get_first_error (C function) +@anchor{topics/contexts c gcc_jit_context_get_first_error}@anchor{57} +@deffn {C Function} const char * gcc_jit_context_get_first_error (gcc_jit_context@w{ }*ctxt) + +Returns the first error message that occurred on the context. + +The returned string is valid for the rest of the lifetime of the +context. + +If no errors occurred, this will be NULL. +@end deffn + +If you are wrapping the C API for a higher-level language that supports +exception-handling, you may instead be interested in the last error that +occurred on the context, so that you can embed this in an exception: + +@geindex gcc_jit_context_get_last_error (C function) +@anchor{topics/contexts c gcc_jit_context_get_last_error}@anchor{58} +@deffn {C Function} const char * gcc_jit_context_get_last_error (gcc_jit_context@w{ }*ctxt) + +Returns the last error message that occurred on the context. + +If no errors occurred, this will be NULL. + +If non-NULL, the returned string is only guaranteed to be valid until +the next call to libgccjit relating to this context. +@end deffn + +@node Debugging,Options<2>,Error-handling<2>,Compilation contexts +@anchor{topics/contexts debugging}@anchor{59} +@subsection Debugging + + +@geindex gcc_jit_context_dump_to_file (C function) +@anchor{topics/contexts c gcc_jit_context_dump_to_file}@anchor{5a} +@deffn {C Function} void gcc_jit_context_dump_to_file (gcc_jit_context@w{ }*ctxt, const char@w{ }*path, int@w{ }update_locations) + +To help with debugging: dump a C-like representation to the given path, +describing what’s been set up on the context. + +If “update_locations” is true, then also set up @ref{3b,,gcc_jit_location} +information throughout the context, pointing at the dump file as if it +were a source file. This may be of use in conjunction with +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} to allow stepping through the +code in a debugger. +@end deffn + +@geindex gcc_jit_context_set_logfile (C function) +@anchor{topics/contexts c gcc_jit_context_set_logfile}@anchor{5b} +@deffn {C Function} void gcc_jit_context_set_logfile (gcc_jit_context@w{ }*ctxt, FILE@w{ }*logfile, int@w{ }flags, int@w{ }verbosity) + +To help with debugging; enable ongoing logging of the context’s +activity to the given file. + +For example, the following will enable logging to stderr. + +@example +gcc_jit_context_set_logfile (ctxt, stderr, 0, 0); +@end example + +Examples of information logged include: + + +@itemize * + +@item +API calls + +@item +the various steps involved within compilation + +@item +activity on any @ref{16,,gcc_jit_result} instances created by +the context + +@item +activity within any child contexts +@end itemize + +An example of a log can be seen @ref{5c,,here}, +though the precise format and kinds of information logged is subject +to change. + +The caller remains responsible for closing @cite{logfile}, and it must not +be closed until all users are released. In particular, note that +child contexts and @ref{16,,gcc_jit_result} instances created by +the context will use the logfile. + +There may a performance cost for logging. + +You can turn off logging on @cite{ctxt} by passing @cite{NULL} for @cite{logfile}. +Doing so only affects the context; it does not affect child contexts +or @ref{16,,gcc_jit_result} instances already created by +the context. + +The parameters “flags” and “verbosity” are reserved for future +expansion, and must be zero for now. +@end deffn + +To contrast the above: @ref{5a,,gcc_jit_context_dump_to_file()} dumps the +current state of a context to the given path, whereas +@ref{5b,,gcc_jit_context_set_logfile()} enables on-going logging of +future activies on a context to the given @cite{FILE *}. + +@geindex gcc_jit_context_dump_reproducer_to_file (C function) +@anchor{topics/contexts c gcc_jit_context_dump_reproducer_to_file}@anchor{5d} +@deffn {C Function} void gcc_jit_context_dump_reproducer_to_file (gcc_jit_context@w{ }*ctxt, const char@w{ }*path) + +Write C source code into @cite{path} that can be compiled into a +self-contained executable (i.e. with libgccjit as the only dependency). +The generated code will attempt to replay the API calls that have been +made into the given context. + +This may be useful when debugging the library or client code, for +reducing a complicated recipe for reproducing a bug into a simpler +form. For example, consider client code that parses some source file +into some internal representation, and then walks this IR, calling into +libgccjit. If this encounters a bug, a call to +@cite{gcc_jit_context_dump_reproducer_to_file} will write out C code for +a much simpler executable that performs the equivalent calls into +libgccjit, without needing the client code and its data. + +Typically you need to supply @code{-Wno-unused-variable} when +compiling the generated file (since the result of each API call is +assigned to a unique variable within the generated C source, and not +all are necessarily then used). +@end deffn + +@geindex gcc_jit_context_enable_dump (C function) +@anchor{topics/contexts c gcc_jit_context_enable_dump}@anchor{5e} +@deffn {C Function} void gcc_jit_context_enable_dump (gcc_jit_context@w{ }*ctxt, const char@w{ }*dumpname, char@w{ }**out_ptr) + +Enable the dumping of a specific set of internal state from the +compilation, capturing the result in-memory as a buffer. + +Parameter “dumpname” corresponds to the equivalent gcc command-line +option, without the “-fdump-” prefix. +For example, to get the equivalent of @code{-fdump-tree-vrp1}, +supply @code{"tree-vrp1"}: + +@example +static char *dump_vrp1; + +void +create_code (gcc_jit_context *ctxt) +@{ + gcc_jit_context_enable_dump (ctxt, "tree-vrp1", &dump_vrp1); + /* (other API calls omitted for brevity) */ +@} +@end example + +The context directly stores the dumpname as a @code{(const char *)}, so +the passed string must outlive the context. + +@ref{15,,gcc_jit_context_compile()} will capture the dump as a +dynamically-allocated buffer, writing it to @code{*out_ptr}. + +The caller becomes responsible for calling: + +@example +free (*out_ptr) +@end example + +each time that @ref{15,,gcc_jit_context_compile()} is called. +@code{*out_ptr} will be written to, either with the address of a buffer, +or with @code{NULL} if an error occurred. + +@cartouche +@quotation Warning +This API entrypoint is likely to be less stable than the others. +In particular, both the precise dumpnames, and the format and content +of the dumps are subject to change. + +It exists primarily for writing the library’s own test suite. +@end quotation +@end cartouche +@end deffn + +@node Options<2>,,Debugging,Compilation contexts +@anchor{topics/contexts options}@anchor{5f} +@subsection Options + + +Options present in the initial release of libgccjit were handled using +enums, whereas those added subsequently have their own per-option API +entrypoints. + +Adding entrypoints for each new option means that client code that use +the new options can be identified directly from binary metadata, which +would not be possible if we instead extended the various +@code{enum gcc_jit_*_option}. + +@menu +* String Options:: +* Boolean options:: +* Integer options:: +* Additional command-line options:: + +@end menu + +@node String Options,Boolean options,,Options<2> +@anchor{topics/contexts string-options}@anchor{60} +@subsubsection String Options + + +@geindex gcc_jit_context_set_str_option (C function) +@anchor{topics/contexts c gcc_jit_context_set_str_option}@anchor{61} +@deffn {C Function} void gcc_jit_context_set_str_option (gcc_jit_context@w{ }*ctxt, enum gcc_jit_str_option@w{ }opt, const char@w{ }*value) + +Set a string option of the context. + +@geindex gcc_jit_str_option (C type) +@anchor{topics/contexts c gcc_jit_str_option}@anchor{62} +@deffn {C Type} enum gcc_jit_str_option +@end deffn + +The parameter @code{value} can be NULL. If non-NULL, the call takes a +copy of the underlying string, so it is valid to pass in a pointer to +an on-stack buffer. + +There is just one string option specified this way: + +@geindex GCC_JIT_STR_OPTION_PROGNAME (C macro) +@anchor{topics/contexts c GCC_JIT_STR_OPTION_PROGNAME}@anchor{63} +@deffn {C Macro} GCC_JIT_STR_OPTION_PROGNAME + +The name of the program, for use as a prefix when printing error +messages to stderr. If @cite{NULL}, or default, “libgccjit.so” is used. +@end deffn +@end deffn + +@node Boolean options,Integer options,String Options,Options<2> +@anchor{topics/contexts boolean-options}@anchor{64} +@subsubsection Boolean options + + +@geindex gcc_jit_context_set_bool_option (C function) +@anchor{topics/contexts c gcc_jit_context_set_bool_option}@anchor{1b} +@deffn {C Function} void gcc_jit_context_set_bool_option (gcc_jit_context@w{ }*ctxt, enum gcc_jit_bool_option@w{ }opt, int@w{ }value) + +Set a boolean option of the context. +Zero is “false” (the default), non-zero is “true”. + +@geindex gcc_jit_bool_option (C type) +@anchor{topics/contexts c gcc_jit_bool_option}@anchor{65} +@deffn {C Type} enum gcc_jit_bool_option +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DEBUGINFO (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DEBUGINFO}@anchor{42} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DEBUGINFO + +If true, @ref{15,,gcc_jit_context_compile()} will attempt to do the right +thing so that if you attach a debugger to the process, it will +be able to inspect variables and step through your code. + +Note that you can’t step through code unless you set up source +location information for the code (by creating and passing in +@ref{3b,,gcc_jit_location} instances). +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE}@anchor{66} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE + +If true, @ref{15,,gcc_jit_context_compile()} will dump its initial +“tree” representation of your code to stderr (before any +optimizations). + +Here’s some sample output (from the @cite{square} example): + +@example +> + side-effects head 0x7f4875a761e0 tail 0x7f4875a761f8 stmts 0x7f4875a62d20 0x7f4875a62d00 + + stmt + side-effects + arg 0 + VOID file (null) line 0 col 0 + align 1 context >> + stmt + unit size + align 32 symtab 0 alias set -1 canonical type 0x7f4875a645e8 precision 32 min max + pointer_to_this > + side-effects + arg 0 + side-effects arg 0 + arg 1 + arg 0 arg 1 >>>> +@end example +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE}@anchor{1c} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE + +If true, @ref{15,,gcc_jit_context_compile()} will dump the “gimple” +representation of your code to stderr, before any optimizations +are performed. The dump resembles C code: + +@example +square (signed int i) +@{ + signed int D.56; + + entry: + D.56 = i * i; + return D.56; +@} +@end example +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE}@anchor{1d} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE + +If true, @ref{15,,gcc_jit_context_compile()} will dump the final +generated code to stderr, in the form of assembly language: + +@example + .file "fake.c" + .text + .globl square + .type square, @@function +square: +.LFB0: + .cfi_startproc + pushq %rbp + .cfi_def_cfa_offset 16 + .cfi_offset 6, -16 + movq %rsp, %rbp + .cfi_def_cfa_register 6 + movl %edi, -4(%rbp) +.L2: + movl -4(%rbp), %eax + imull -4(%rbp), %eax + popq %rbp + .cfi_def_cfa 7, 8 + ret + .cfi_endproc +.LFE0: + .size square, .-square + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.1-%@{gcc_release@})" + .section .note.GNU-stack,"",@@progbits +@end example +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DUMP_SUMMARY (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DUMP_SUMMARY}@anchor{67} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DUMP_SUMMARY + +If true, @ref{15,,gcc_jit_context_compile()} will print information to stderr +on the actions it is performing. +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING}@anchor{68} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING + +If true, @ref{15,,gcc_jit_context_compile()} will dump copious +amount of information on what it’s doing to various +files within a temporary directory. Use +@ref{69,,GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES} (see below) to +see the results. The files are intended to be human-readable, +but the exact files and their formats are subject to change. +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_SELFCHECK_GC (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_SELFCHECK_GC}@anchor{6a} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_SELFCHECK_GC + +If true, libgccjit will aggressively run its garbage collector, to +shake out bugs (greatly slowing down the compile). This is likely +to only be of interest to developers @emph{of} the library. It is +used when running the selftest suite. +@end deffn + +@geindex GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES (C macro) +@anchor{topics/contexts c GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES}@anchor{69} +@deffn {C Macro} GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES + +If true, the @ref{8,,gcc_jit_context} will not clean up intermediate files +written to the filesystem, and will display their location on stderr. +@end deffn +@end deffn + +@geindex gcc_jit_context_set_bool_allow_unreachable_blocks (C function) +@anchor{topics/contexts c gcc_jit_context_set_bool_allow_unreachable_blocks}@anchor{6b} +@deffn {C Function} void gcc_jit_context_set_bool_allow_unreachable_blocks (gcc_jit_context@w{ }*ctxt, int@w{ }bool_value) + +By default, libgccjit will issue an error about unreachable blocks +within a function. + +This entrypoint can be used to disable that error. + +This entrypoint was added in @ref{6c,,LIBGCCJIT_ABI_2}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_set_bool_allow_unreachable_blocks +@end example +@end deffn + +@geindex gcc_jit_context_set_bool_use_external_driver (C function) +@anchor{topics/contexts c gcc_jit_context_set_bool_use_external_driver}@anchor{6d} +@deffn {C Function} void gcc_jit_context_set_bool_use_external_driver (gcc_jit_context@w{ }*ctxt, int@w{ }bool_value) + +libgccjit internally generates assembler, and uses “driver” code +for converting it to other formats (e.g. shared libraries). + +By default, libgccjit will use an embedded copy of the driver +code. + +This option can be used to instead invoke an external driver executable +as a subprocess. + +This entrypoint was added in @ref{6e,,LIBGCCJIT_ABI_5}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_set_bool_use_external_driver +@end example +@end deffn + +@geindex gcc_jit_context_set_bool_print_errors_to_stderr (C function) +@anchor{topics/contexts c gcc_jit_context_set_bool_print_errors_to_stderr}@anchor{6f} +@deffn {C Function} void gcc_jit_context_set_bool_print_errors_to_stderr (gcc_jit_context@w{ }*ctxt, int@w{ }enabled) + +By default, libgccjit will print errors to stderr. + +This entrypoint can be used to disable the printing. + +This entrypoint was added in @ref{70,,LIBGCCJIT_ABI_23}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_set_bool_print_errors_to_stderr +@end example +@end deffn + +@node Integer options,Additional command-line options,Boolean options,Options<2> +@anchor{topics/contexts integer-options}@anchor{71} +@subsubsection Integer options + + +@geindex gcc_jit_context_set_int_option (C function) +@anchor{topics/contexts c gcc_jit_context_set_int_option}@anchor{1e} +@deffn {C Function} void gcc_jit_context_set_int_option (gcc_jit_context@w{ }*ctxt, enum gcc_jit_int_option@w{ }opt, int@w{ }value) + +Set an integer option of the context. + +@geindex gcc_jit_int_option (C type) +@anchor{topics/contexts c gcc_jit_int_option}@anchor{72} +@deffn {C Type} enum gcc_jit_int_option +@end deffn + +There is just one integer option specified this way: + +@geindex GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL (C macro) +@anchor{topics/contexts c GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL}@anchor{1f} +@deffn {C Macro} GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL + +How much to optimize the code. + +Valid values are 0-3, corresponding to GCC’s command-line options +-O0 through -O3. + +The default value is 0 (unoptimized). +@end deffn +@end deffn + +@node Additional command-line options,,Integer options,Options<2> +@anchor{topics/contexts additional-command-line-options}@anchor{73} +@subsubsection Additional command-line options + + +@geindex gcc_jit_context_add_command_line_option (C function) +@anchor{topics/contexts c gcc_jit_context_add_command_line_option}@anchor{74} +@deffn {C Function} void gcc_jit_context_add_command_line_option (gcc_jit_context@w{ }*ctxt, const char@w{ }*optname) + +Add an arbitrary gcc command-line option to the context, for use +by @ref{15,,gcc_jit_context_compile()} and +@ref{4a,,gcc_jit_context_compile_to_file()}. + +The parameter @code{optname} must be non-NULL. The underlying buffer is +copied, so that it does not need to outlive the call. + +Extra options added by @cite{gcc_jit_context_add_command_line_option} are +applied @emph{after} the regular options above, potentially overriding them. +Options from parent contexts are inherited by child contexts; options +from the parent are applied @emph{before} those from the child. + +For example: + +@example +gcc_jit_context_add_command_line_option (ctxt, "-ffast-math"); +gcc_jit_context_add_command_line_option (ctxt, "-fverbose-asm"); +@end example + +Note that only some options are likely to be meaningful; there is no +“frontend” within libgccjit, so typically only those affecting +optimization and code-generation are likely to be useful. + +This entrypoint was added in @ref{75,,LIBGCCJIT_ABI_1}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_add_command_line_option +@end example +@end deffn + +@geindex gcc_jit_context_add_driver_option (C function) +@anchor{topics/contexts c gcc_jit_context_add_driver_option}@anchor{76} +@deffn {C Function} void gcc_jit_context_add_driver_option (gcc_jit_context@w{ }*ctxt, const char@w{ }*optname) + +Add an arbitrary gcc driver option to the context, for use by +@ref{15,,gcc_jit_context_compile()} and +@ref{4a,,gcc_jit_context_compile_to_file()}. + +The parameter @code{optname} must be non-NULL. The underlying buffer is +copied, so that it does not need to outlive the call. + +Extra options added by @cite{gcc_jit_context_add_driver_option} are +applied @emph{after} all other options potentially overriding them. +Options from parent contexts are inherited by child contexts; options +from the parent are applied @emph{before} those from the child. + +For example: + +@example +gcc_jit_context_add_driver_option (ctxt, "-lm"); +gcc_jit_context_add_driver_option (ctxt, "-fuse-linker-plugin"); + +gcc_jit_context_add_driver_option (ctxt, "obj.o"); + +gcc_jit_context_add_driver_option (ctxt, "-L."); +gcc_jit_context_add_driver_option (ctxt, "-lwhatever"); +@end example + +Note that only some options are likely to be meaningful; there is no +“frontend” within libgccjit, so typically only those affecting +assembler and linker are likely to be useful. + +This entrypoint was added in @ref{77,,LIBGCCJIT_ABI_11}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_add_driver_option +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Objects,Types,Compilation contexts,Topic Reference +@anchor{topics/objects doc}@anchor{78}@anchor{topics/objects objects}@anchor{79} +@section Objects + + +@geindex gcc_jit_object (C type) +@anchor{topics/objects c gcc_jit_object}@anchor{e} +@deffn {C Type} gcc_jit_object +@end deffn + +Almost every entity in the API (with the exception of +@ref{8,,gcc_jit_context *} and @ref{16,,gcc_jit_result *}) is a +“contextual” object, a @ref{e,,gcc_jit_object *} + +A JIT object: + +@quotation + + +@itemize * + +@item +is associated with a @ref{8,,gcc_jit_context *}. + +@item +is automatically cleaned up for you when its context is released so +you don’t need to manually track and cleanup all objects, just the +contexts. +@end itemize +@end quotation + +Although the API is C-based, there is a form of class hierarchy, which +looks like this: + +@example ++- gcc_jit_object + +- gcc_jit_location + +- gcc_jit_type + +- gcc_jit_struct + +- gcc_jit_field + +- gcc_jit_function + +- gcc_jit_block + +- gcc_jit_rvalue + +- gcc_jit_lvalue + +- gcc_jit_param + +- gcc_jit_case + +- gcc_jit_extended_asm +@end example + +There are casting methods for upcasting from subclasses to parent classes. +For example, @ref{d,,gcc_jit_type_as_object()}: + +@example +gcc_jit_object *obj = gcc_jit_type_as_object (int_type); +@end example + +The object “base class” has the following operations: + +@geindex gcc_jit_object_get_context (C function) +@anchor{topics/objects c gcc_jit_object_get_context}@anchor{7a} +@deffn {C Function} gcc_jit_context *gcc_jit_object_get_context (gcc_jit_object@w{ }*obj) + +Which context is “obj” within? +@end deffn + +@geindex gcc_jit_object_get_debug_string (C function) +@anchor{topics/objects c gcc_jit_object_get_debug_string}@anchor{f} +@deffn {C Function} const char *gcc_jit_object_get_debug_string (gcc_jit_object@w{ }*obj) + +Generate a human-readable description for the given object. + +For example, + +@example +printf ("obj: %s\n", gcc_jit_object_get_debug_string (obj)); +@end example + +might give this text on stdout: + +@example +obj: 4.0 * (float)i +@end example + +@cartouche +@quotation Note +If you call this on an object, the @cite{const char *} buffer is allocated +and generated on the first call for that object, and the buffer will +have the same lifetime as the object i.e. it will exist until the +object’s context is released. +@end quotation +@end cartouche +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Types,Expressions,Objects,Topic Reference +@anchor{topics/types doc}@anchor{7b}@anchor{topics/types types}@anchor{7c} +@section Types + + +@geindex gcc_jit_type (C type) +@anchor{topics/types c gcc_jit_type}@anchor{a} +@deffn {C Type} gcc_jit_type + +gcc_jit_type represents a type within the library. +@end deffn + +@geindex gcc_jit_type_as_object (C function) +@anchor{topics/types c gcc_jit_type_as_object}@anchor{d} +@deffn {C Function} gcc_jit_object *gcc_jit_type_as_object (gcc_jit_type@w{ }*type) + +Upcast a type to an object. +@end deffn + +Types can be created in several ways: + + +@itemize * + +@item +fundamental types can be accessed using +@ref{b,,gcc_jit_context_get_type()}: + +@example +gcc_jit_type *int_type = gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); +@end example + +See @ref{b,,gcc_jit_context_get_type()} for the available types. + +@item +derived types can be accessed by using functions such as +@ref{7d,,gcc_jit_type_get_pointer()} and @ref{7e,,gcc_jit_type_get_const()}: + +@example +gcc_jit_type *const_int_star = gcc_jit_type_get_pointer (gcc_jit_type_get_const (int_type)); +gcc_jit_type *int_const_star = gcc_jit_type_get_const (gcc_jit_type_get_pointer (int_type)); +@end example + +@item +by creating structures (see below). +@end itemize + +@menu +* Standard types:: +* Pointers@comma{} const@comma{} and volatile: Pointers const and volatile. +* Vector types:: +* Structures and unions:: +* Function pointer types:: +* Reflection API:: + +@end menu + +@node Standard types,Pointers const and volatile,,Types +@anchor{topics/types standard-types}@anchor{7f} +@subsection Standard types + + +@geindex gcc_jit_context_get_type (C function) +@anchor{topics/types c gcc_jit_context_get_type}@anchor{b} +@deffn {C Function} gcc_jit_type *gcc_jit_context_get_type (gcc_jit_context@w{ }*ctxt, enum gcc_jit_types@w{ }type_) + +Access a specific type. The available types are: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} +@headitem + +@cite{enum gcc_jit_types} value + +@tab + +Meaning + +@item + +@code{GCC_JIT_TYPE_VOID} + +@tab + +C’s @code{void} type. + +@item + +@code{GCC_JIT_TYPE_VOID_PTR} + +@tab + +C’s @code{void *}. + +@item + +@code{GCC_JIT_TYPE_BOOL} + +@tab + +C++’s @code{bool} type; also C99’s +@code{_Bool} type, aka @code{bool} if +using stdbool.h. + +@item + +@code{GCC_JIT_TYPE_CHAR} + +@tab + +C’s @code{char} (of some signedness) + +@item + +@code{GCC_JIT_TYPE_SIGNED_CHAR} + +@tab + +C’s @code{signed char} + +@item + +@code{GCC_JIT_TYPE_UNSIGNED_CHAR} + +@tab + +C’s @code{unsigned char} + +@item + +@code{GCC_JIT_TYPE_SHORT} + +@tab + +C’s @code{short} (signed) + +@item + +@code{GCC_JIT_TYPE_UNSIGNED_SHORT} + +@tab + +C’s @code{unsigned short} + +@item + +@code{GCC_JIT_TYPE_INT} + +@tab + +C’s @code{int} (signed) + +@item + +@code{GCC_JIT_TYPE_UNSIGNED_INT} + +@tab + +C’s @code{unsigned int} + +@item + +@code{GCC_JIT_TYPE_LONG} + +@tab + +C’s @code{long} (signed) + +@item + +@code{GCC_JIT_TYPE_UNSIGNED_LONG} + +@tab + +C’s @code{unsigned long} + +@item + +@code{GCC_JIT_TYPE_LONG_LONG} + +@tab + +C99’s @code{long long} (signed) + +@item + +@code{GCC_JIT_TYPE_UNSIGNED_LONG_LONG} + +@tab + +C99’s @code{unsigned long long} + +@item + +@code{GCC_JIT_TYPE_UINT8_T} + +@tab + +C99’s @code{uint8_t} + +@item + +@code{GCC_JIT_TYPE_UINT16_T} + +@tab + +C99’s @code{uint16_t} + +@item + +@code{GCC_JIT_TYPE_UINT32_T} + +@tab + +C99’s @code{uint32_t} + +@item + +@code{GCC_JIT_TYPE_UINT64_T} + +@tab + +C99’s @code{uint64_t} + +@item + +@code{GCC_JIT_TYPE_UINT128_T} + +@tab + +C99’s @code{__uint128_t} + +@item + +@code{GCC_JIT_TYPE_INT8_T} + +@tab + +C99’s @code{int8_t} + +@item + +@code{GCC_JIT_TYPE_INT16_T} + +@tab + +C99’s @code{int16_t} + +@item + +@code{GCC_JIT_TYPE_INT32_T} + +@tab + +C99’s @code{int32_t} + +@item + +@code{GCC_JIT_TYPE_INT64_T} + +@tab + +C99’s @code{int64_t} + +@item + +@code{GCC_JIT_TYPE_INT128_T} + +@tab + +C99’s @code{__int128_t} + +@item + +@code{GCC_JIT_TYPE_FLOAT} + +@tab + +@item + +@code{GCC_JIT_TYPE_DOUBLE} + +@tab + +@item + +@code{GCC_JIT_TYPE_LONG_DOUBLE} + +@tab + +@item + +@code{GCC_JIT_TYPE_CONST_CHAR_PTR} + +@tab + +C type: @code{(const char *)} + +@item + +@code{GCC_JIT_TYPE_SIZE_T} + +@tab + +C’s @code{size_t} type + +@item + +@code{GCC_JIT_TYPE_FILE_PTR} + +@tab + +C type: @code{(FILE *)} + +@item + +@code{GCC_JIT_TYPE_COMPLEX_FLOAT} + +@tab + +C99’s @code{_Complex float} + +@item + +@code{GCC_JIT_TYPE_COMPLEX_DOUBLE} + +@tab + +C99’s @code{_Complex double} + +@item + +@code{GCC_JIT_TYPE_COMPLEX_LONG_DOUBLE} + +@tab + +C99’s @code{_Complex long double} + +@end multitable + +@end deffn + +@geindex gcc_jit_context_get_int_type (C function) +@anchor{topics/types c gcc_jit_context_get_int_type}@anchor{80} +@deffn {C Function} gcc_jit_type * gcc_jit_context_get_int_type (gcc_jit_context@w{ }*ctxt, int@w{ }num_bytes, int@w{ }is_signed) + +Access the integer type of the given size. +@end deffn + +@node Pointers const and volatile,Vector types,Standard types,Types +@anchor{topics/types pointers-const-and-volatile}@anchor{81} +@subsection Pointers, @cite{const}, and @cite{volatile} + + +@geindex gcc_jit_type_get_pointer (C function) +@anchor{topics/types c gcc_jit_type_get_pointer}@anchor{7d} +@deffn {C Function} gcc_jit_type *gcc_jit_type_get_pointer (gcc_jit_type@w{ }*type) + +Given type “T”, get type “T*”. +@end deffn + +@geindex gcc_jit_type_get_const (C function) +@anchor{topics/types c gcc_jit_type_get_const}@anchor{7e} +@deffn {C Function} gcc_jit_type *gcc_jit_type_get_const (gcc_jit_type@w{ }*type) + +Given type “T”, get type “const T”. +@end deffn + +@geindex gcc_jit_type_get_volatile (C function) +@anchor{topics/types c gcc_jit_type_get_volatile}@anchor{82} +@deffn {C Function} gcc_jit_type *gcc_jit_type_get_volatile (gcc_jit_type@w{ }*type) + +Given type “T”, get type “volatile T”. +@end deffn + +@geindex gcc_jit_context_new_array_type (C function) +@anchor{topics/types c gcc_jit_context_new_array_type}@anchor{83} +@deffn {C Function} gcc_jit_type * gcc_jit_context_new_array_type (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*element_type, int@w{ }num_elements) + +Given non-@cite{void} type “T”, get type “T[N]” (for a constant N). +@end deffn + +@geindex gcc_jit_type_get_aligned (C function) +@anchor{topics/types c gcc_jit_type_get_aligned}@anchor{84} +@deffn {C Function} gcc_jit_type * gcc_jit_type_get_aligned (gcc_jit_type@w{ }*type, size_t@w{ }alignment_in_bytes) + +Given non-@cite{void} type “T”, get type: + +@example +T __attribute__ ((aligned (ALIGNMENT_IN_BYTES))) +@end example + +The alignment must be a power of two. + +This entrypoint was added in @ref{85,,LIBGCCJIT_ABI_7}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_type_get_aligned +@end example +@end deffn + +@node Vector types,Structures and unions,Pointers const and volatile,Types +@anchor{topics/types vector-types}@anchor{86} +@subsection Vector types + + +@geindex gcc_jit_type_get_vector (C function) +@anchor{topics/types c gcc_jit_type_get_vector}@anchor{87} +@deffn {C Function} gcc_jit_type * gcc_jit_type_get_vector (gcc_jit_type@w{ }*type, size_t@w{ }num_units) + +Given type “T”, get type: + +@example +T __attribute__ ((vector_size (sizeof(T) * num_units)) +@end example + +T must be integral or floating point; num_units must be a power of two. + +This can be used to construct a vector type in which operations +are applied element-wise. The compiler will automatically +use SIMD instructions where possible. See: +@indicateurl{https://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html} + +For example, assuming 4-byte @code{ints}, then: + +@example +typedef int v4si __attribute__ ((vector_size (16))); +@end example + +can be obtained using: + +@example +gcc_jit_type *int_type = gcc_jit_context_get_type (ctxt, + GCC_JIT_TYPE_INT); +gcc_jit_type *v4si_type = gcc_jit_type_get_vector (int_type, 4); +@end example + +This API entrypoint was added in @ref{88,,LIBGCCJIT_ABI_8}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_type_get_vector +@end example + +Vector rvalues can be generated using +@ref{89,,gcc_jit_context_new_rvalue_from_vector()}. +@end deffn + +@node Structures and unions,Function pointer types,Vector types,Types +@anchor{topics/types structures-and-unions}@anchor{8a} +@subsection Structures and unions + + +@geindex gcc_jit_struct (C type) +@anchor{topics/types c gcc_jit_struct}@anchor{8b} +@deffn {C Type} gcc_jit_struct +@end deffn + +A compound type analagous to a C @cite{struct}. + +@geindex gcc_jit_field (C type) +@anchor{topics/types c gcc_jit_field}@anchor{8c} +@deffn {C Type} gcc_jit_field +@end deffn + +A field within a @ref{8b,,gcc_jit_struct}. + +You can model C @cite{struct} types by creating @ref{8b,,gcc_jit_struct} and +@ref{8c,,gcc_jit_field} instances, in either order: + + +@itemize * + +@item +by creating the fields, then the structure. For example, to model: + +@example +struct coord @{double x; double y; @}; +@end example + +you could call: + +@example +gcc_jit_field *field_x = + gcc_jit_context_new_field (ctxt, NULL, double_type, "x"); +gcc_jit_field *field_y = + gcc_jit_context_new_field (ctxt, NULL, double_type, "y"); +gcc_jit_field *fields[2] = @{field_x, field_y@}; +gcc_jit_struct *coord = + gcc_jit_context_new_struct_type (ctxt, NULL, "coord", 2, fields); +@end example + +@item +by creating the structure, then populating it with fields, typically +to allow modelling self-referential structs such as: + +@example +struct node @{ int m_hash; struct node *m_next; @}; +@end example + +like this: + +@example +gcc_jit_type *node = + gcc_jit_context_new_opaque_struct (ctxt, NULL, "node"); +gcc_jit_type *node_ptr = + gcc_jit_type_get_pointer (node); +gcc_jit_field *field_hash = + gcc_jit_context_new_field (ctxt, NULL, int_type, "m_hash"); +gcc_jit_field *field_next = + gcc_jit_context_new_field (ctxt, NULL, node_ptr, "m_next"); +gcc_jit_field *fields[2] = @{field_hash, field_next@}; +gcc_jit_struct_set_fields (node, NULL, 2, fields); +@end example +@end itemize + +@geindex gcc_jit_context_new_field (C function) +@anchor{topics/types c gcc_jit_context_new_field}@anchor{8d} +@deffn {C Function} gcc_jit_field * gcc_jit_context_new_field (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, const char@w{ }*name) + +Construct a new field, with the given type and name. + +The parameter @code{type} must be non-@cite{void}. + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. +@end deffn + +@geindex gcc_jit_context_new_bitfield (C function) +@anchor{topics/types c gcc_jit_context_new_bitfield}@anchor{8e} +@deffn {C Function} gcc_jit_field * gcc_jit_context_new_bitfield (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, int@w{ }width, const char@w{ }*name) + +Construct a new bit field, with the given type width and name. + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. + +The parameter @code{type} must be an integer type. + +The parameter @code{width} must be a positive integer that does not exceed the +size of @code{type}. + +This API entrypoint was added in @ref{8f,,LIBGCCJIT_ABI_12}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_new_bitfield +@end example +@end deffn + +@geindex gcc_jit_field_as_object (C function) +@anchor{topics/types c gcc_jit_field_as_object}@anchor{90} +@deffn {C Function} gcc_jit_object * gcc_jit_field_as_object (gcc_jit_field@w{ }*field) + +Upcast from field to object. +@end deffn + +@geindex gcc_jit_context_new_struct_type (C function) +@anchor{topics/types c gcc_jit_context_new_struct_type}@anchor{91} +@deffn {C Function} gcc_jit_struct *gcc_jit_context_new_struct_type (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, const char@w{ }*name, int@w{ }num_fields, gcc_jit_field@w{ }**fields) + +@quotation + +Construct a new struct type, with the given name and fields. + +The parameter @code{name} must be non-NULL. The call takes a copy of +the underlying string, so it is valid to pass in a pointer to an +on-stack buffer. +@end quotation +@end deffn + +@geindex gcc_jit_context_new_opaque_struct (C function) +@anchor{topics/types c gcc_jit_context_new_opaque_struct}@anchor{92} +@deffn {C Function} gcc_jit_struct * gcc_jit_context_new_opaque_struct (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, const char@w{ }*name) + +Construct a new struct type, with the given name, but without +specifying the fields. The fields can be omitted (in which case the +size of the struct is not known), or later specified using +@ref{93,,gcc_jit_struct_set_fields()}. + +The parameter @code{name} must be non-NULL. The call takes a copy of +the underlying string, so it is valid to pass in a pointer to an +on-stack buffer. +@end deffn + +@geindex gcc_jit_struct_as_type (C function) +@anchor{topics/types c gcc_jit_struct_as_type}@anchor{94} +@deffn {C Function} gcc_jit_type * gcc_jit_struct_as_type (gcc_jit_struct@w{ }*struct_type) + +Upcast from struct to type. +@end deffn + +@geindex gcc_jit_struct_set_fields (C function) +@anchor{topics/types c gcc_jit_struct_set_fields}@anchor{93} +@deffn {C Function} void gcc_jit_struct_set_fields (gcc_jit_struct@w{ }*struct_type, gcc_jit_location@w{ }*loc, int@w{ }num_fields, gcc_jit_field@w{ }**fields) + +Populate the fields of a formerly-opaque struct type. + +This can only be called once on a given struct type. +@end deffn + +@geindex gcc_jit_context_new_union_type (C function) +@anchor{topics/types c gcc_jit_context_new_union_type}@anchor{95} +@deffn {C Function} gcc_jit_type * gcc_jit_context_new_union_type (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, const char@w{ }*name, int@w{ }num_fields, gcc_jit_field@w{ }**fields) + +Construct a new union type, with the given name and fields. + +The parameter @code{name} must be non-NULL. It is copied, so the input +buffer does not need to outlive the call. + +Example of use: + +@example + +union int_or_float +@{ + int as_int; + float as_float; +@}; + +void +create_code (gcc_jit_context *ctxt, void *user_data) +@{ + /* Let's try to inject the equivalent of: + float + test_union (int i) + @{ + union int_or_float u; + u.as_int = i; + return u.as_float; + @} + */ + gcc_jit_type *int_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + gcc_jit_type *float_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_FLOAT); + gcc_jit_field *as_int = + gcc_jit_context_new_field (ctxt, + NULL, + int_type, + "as_int"); + gcc_jit_field *as_float = + gcc_jit_context_new_field (ctxt, + NULL, + float_type, + "as_float"); + gcc_jit_field *fields[] = @{as_int, as_float@}; + gcc_jit_type *union_type = + gcc_jit_context_new_union_type (ctxt, NULL, + "int_or_float", 2, fields); + + /* Build the test function. */ + gcc_jit_param *param_i = + gcc_jit_context_new_param (ctxt, NULL, int_type, "i"); + gcc_jit_function *test_fn = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + float_type, + "test_union", + 1, ¶m_i, + 0); + + gcc_jit_lvalue *u = + gcc_jit_function_new_local (test_fn, NULL, + union_type, "u"); + + gcc_jit_block *block = gcc_jit_function_new_block (test_fn, NULL); + + /* u.as_int = i; */ + gcc_jit_block_add_assignment ( + block, + NULL, + /* "u.as_int = ..." */ + gcc_jit_lvalue_access_field (u, + NULL, + as_int), + gcc_jit_param_as_rvalue (param_i)); + + /* return u.as_float; */ + gcc_jit_block_end_with_return ( + block, NULL, + gcc_jit_rvalue_access_field (gcc_jit_lvalue_as_rvalue (u), + NULL, + as_float)); +@} + +@end example +@end deffn + +@node Function pointer types,Reflection API,Structures and unions,Types +@anchor{topics/types function-pointer-types}@anchor{96} +@subsection Function pointer types + + +Function pointer types can be created using +@ref{97,,gcc_jit_context_new_function_ptr_type()}. + +@node Reflection API,,Function pointer types,Types +@anchor{topics/types reflection-api}@anchor{98} +@subsection Reflection API + + +@geindex gcc_jit_type_dyncast_array (C function) +@anchor{topics/types c gcc_jit_type_dyncast_array}@anchor{99} +@deffn {C Function} gcc_jit_type * gcc_jit_type_dyncast_array (gcc_jit_type@w{ }*type) + +Get the element type of an array type or NULL if it’s not an array. +@end deffn + +@geindex gcc_jit_type_is_bool (C function) +@anchor{topics/types c gcc_jit_type_is_bool}@anchor{9a} +@deffn {C Function} int gcc_jit_type_is_bool (gcc_jit_type@w{ }*type) + +Return non-zero if the type is a bool. +@end deffn + +@geindex gcc_jit_type_dyncast_function_ptr_type (C function) +@anchor{topics/types c gcc_jit_type_dyncast_function_ptr_type}@anchor{9b} +@deffn {C Function} gcc_jit_function_type * gcc_jit_type_dyncast_function_ptr_type (gcc_jit_type@w{ }*type) + +Return the function type if it is one or NULL. +@end deffn + +@geindex gcc_jit_function_type_get_return_type (C function) +@anchor{topics/types c gcc_jit_function_type_get_return_type}@anchor{9c} +@deffn {C Function} gcc_jit_type * gcc_jit_function_type_get_return_type (gcc_jit_function_type@w{ }*function_type) + +Given a function type, return its return type. +@end deffn + +@geindex gcc_jit_function_type_get_param_count (C function) +@anchor{topics/types c gcc_jit_function_type_get_param_count}@anchor{9d} +@deffn {C Function} size_t gcc_jit_function_type_get_param_count (gcc_jit_function_type@w{ }*function_type) + +Given a function type, return its number of parameters. +@end deffn + +@geindex gcc_jit_function_type_get_param_type (C function) +@anchor{topics/types c gcc_jit_function_type_get_param_type}@anchor{9e} +@deffn {C Function} gcc_jit_type * gcc_jit_function_type_get_param_type (gcc_jit_function_type@w{ }*function_type, size_t@w{ }index) + +Given a function type, return the type of the specified parameter. +@end deffn + +@geindex gcc_jit_type_is_integral (C function) +@anchor{topics/types c gcc_jit_type_is_integral}@anchor{9f} +@deffn {C Function} int gcc_jit_type_is_integral (gcc_jit_type@w{ }*type) + +Return non-zero if the type is an integral. +@end deffn + +@geindex gcc_jit_type_is_pointer (C function) +@anchor{topics/types c gcc_jit_type_is_pointer}@anchor{a0} +@deffn {C Function} gcc_jit_type * gcc_jit_type_is_pointer (gcc_jit_type@w{ }*type) + +Return the type pointed by the pointer type or NULL if it’s not a pointer. +@end deffn + +@geindex gcc_jit_type_dyncast_vector (C function) +@anchor{topics/types c gcc_jit_type_dyncast_vector}@anchor{a1} +@deffn {C Function} gcc_jit_vector_type * gcc_jit_type_dyncast_vector (gcc_jit_type@w{ }*type) + +Given a type, return a dynamic cast to a vector type or NULL. +@end deffn + +@geindex gcc_jit_type_is_struct (C function) +@anchor{topics/types c gcc_jit_type_is_struct}@anchor{a2} +@deffn {C Function} gcc_jit_struct * gcc_jit_type_is_struct (gcc_jit_type@w{ }*type) + +Given a type, return a dynamic cast to a struct type or NULL. +@end deffn + +@geindex gcc_jit_vector_type_get_num_units (C function) +@anchor{topics/types c gcc_jit_vector_type_get_num_units}@anchor{a3} +@deffn {C Function} size_t gcc_jit_vector_type_get_num_units (gcc_jit_vector_type@w{ }*vector_type) + +Given a vector type, return the number of units it contains. +@end deffn + +@geindex gcc_jit_vector_type_get_element_type (C function) +@anchor{topics/types c gcc_jit_vector_type_get_element_type}@anchor{a4} +@deffn {C Function} gcc_jit_type * gcc_jit_vector_type_get_element_type (gcc_jit_vector_type *@w{ }vector_type) + +Given a vector type, return the type of its elements. +@end deffn + +@geindex gcc_jit_type_unqualified (C function) +@anchor{topics/types c gcc_jit_type_unqualified}@anchor{a5} +@deffn {C Function} gcc_jit_type * gcc_jit_type_unqualified (gcc_jit_type@w{ }*type) + +Given a type, return the unqualified type, removing “const”, “volatile” and +alignment qualifiers. +@end deffn + +@geindex gcc_jit_struct_get_field (C function) +@anchor{topics/types c gcc_jit_struct_get_field}@anchor{a6} +@deffn {C Function} gcc_jit_field * gcc_jit_struct_get_field (gcc_jit_struct@w{ }*struct_type, size_t@w{ }index) + +Get a struct field by index. +@end deffn + +@geindex gcc_jit_struct_get_field_count (C function) +@anchor{topics/types c gcc_jit_struct_get_field_count}@anchor{a7} +@deffn {C Function} size_t gcc_jit_struct_get_field_count (gcc_jit_struct@w{ }*struct_type) + +@quotation + +Get the number of fields in the struct. +@end quotation + +The API entrypoints related to the reflection API: + +@quotation + + +@itemize * + +@item +@ref{9c,,gcc_jit_function_type_get_return_type()} + +@item +@ref{9d,,gcc_jit_function_type_get_param_count()} + +@item +@ref{9e,,gcc_jit_function_type_get_param_type()} + +@item +@ref{a5,,gcc_jit_type_unqualified()} + +@item +@ref{99,,gcc_jit_type_dyncast_array()} + +@item +@ref{9a,,gcc_jit_type_is_bool()} + +@item +@ref{9b,,gcc_jit_type_dyncast_function_ptr_type()} + +@item +@ref{9f,,gcc_jit_type_is_integral()} + +@item +@ref{a0,,gcc_jit_type_is_pointer()} + +@item +@ref{a1,,gcc_jit_type_dyncast_vector()} + +@item +@ref{a4,,gcc_jit_vector_type_get_element_type()} + +@item +@ref{a3,,gcc_jit_vector_type_get_num_units()} + +@item +@ref{a6,,gcc_jit_struct_get_field()} + +@item +@ref{a2,,gcc_jit_type_is_struct()} + +@item +@ref{a7,,gcc_jit_struct_get_field_count()} +@end itemize +@end quotation + +were added in @ref{a8,,LIBGCCJIT_ABI_16}; you can test for their presence +using + +@example +#ifdef LIBGCCJIT_HAVE_REFLECTION +@end example + +@geindex gcc_jit_case (C type) +@anchor{topics/types c gcc_jit_case}@anchor{a9} +@deffn {C Type} gcc_jit_case +@end deffn +@end deffn + +@geindex gcc_jit_compatible_types (C function) +@anchor{topics/types c gcc_jit_compatible_types}@anchor{aa} +@deffn {C Function} int gcc_jit_compatible_types (gcc_jit_type@w{ }*ltype, gcc_jit_type@w{ }*rtype) + +@quotation + +Return non-zero if the two types are compatible. For instance, +if @code{GCC_JIT_TYPE_UINT64_T} and @code{GCC_JIT_TYPE_UNSIGNED_LONG} +are the same size on the target, this will return non-zero. +The parameters @code{ltype} and @code{rtype} must be non-NULL. +Return 0 on errors. +@end quotation + +This entrypoint was added in @ref{ab,,LIBGCCJIT_ABI_20}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_SIZED_INTEGERS +@end example +@end deffn + +@geindex gcc_jit_type_get_size (C function) +@anchor{topics/types c gcc_jit_type_get_size}@anchor{ac} +@deffn {C Function} ssize_t gcc_jit_type_get_size (gcc_jit_type@w{ }*type) + +@quotation + +Return the size of a type, in bytes. It only works on integer types for now. +The parameter @code{type} must be non-NULL. +Return -1 on errors. +@end quotation + +This entrypoint was added in @ref{ab,,LIBGCCJIT_ABI_20}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_SIZED_INTEGERS +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Expressions,Creating and using functions,Types,Topic Reference +@anchor{topics/expressions doc}@anchor{ad}@anchor{topics/expressions expressions}@anchor{ae} +@section Expressions + + +@menu +* Rvalues:: +* Lvalues:: +* Working with pointers@comma{} structs and unions: Working with pointers structs and unions. + +@end menu + +@node Rvalues,Lvalues,,Expressions +@anchor{topics/expressions rvalues}@anchor{af} +@subsection Rvalues + + +@geindex gcc_jit_rvalue (C type) +@anchor{topics/expressions c gcc_jit_rvalue}@anchor{13} +@deffn {C Type} gcc_jit_rvalue +@end deffn + +A @ref{13,,gcc_jit_rvalue} is an expression that can be computed. + +It can be simple, e.g.: + +@quotation + + +@itemize * + +@item +an integer value e.g. @cite{0} or @cite{42} + +@item +a string literal e.g. @cite{“Hello world”} + +@item +a variable e.g. @cite{i}. These are also lvalues (see below). +@end itemize +@end quotation + +or compound e.g.: + +@quotation + + +@itemize * + +@item +a unary expression e.g. @cite{!cond} + +@item +a binary expression e.g. @cite{(a + b)} + +@item +a function call e.g. @cite{get_distance (&player_ship@comma{} &target)} + +@item +etc. +@end itemize +@end quotation + +Every rvalue has an associated type, and the API will check to ensure +that types match up correctly (otherwise the context will emit an error). + +@geindex gcc_jit_rvalue_get_type (C function) +@anchor{topics/expressions c gcc_jit_rvalue_get_type}@anchor{b0} +@deffn {C Function} gcc_jit_type *gcc_jit_rvalue_get_type (gcc_jit_rvalue@w{ }*rvalue) + +Get the type of this rvalue. +@end deffn + +@geindex gcc_jit_rvalue_as_object (C function) +@anchor{topics/expressions c gcc_jit_rvalue_as_object}@anchor{14} +@deffn {C Function} gcc_jit_object *gcc_jit_rvalue_as_object (gcc_jit_rvalue@w{ }*rvalue) + +Upcast the given rvalue to be an object. +@end deffn + +@menu +* Simple expressions:: +* Constructor expressions:: +* Vector expressions:: +* Unary Operations:: +* Binary Operations:: +* Comparisons:: +* Function calls:: +* Function pointers:: +* Type-coercion:: + +@end menu + +@node Simple expressions,Constructor expressions,,Rvalues +@anchor{topics/expressions simple-expressions}@anchor{b1} +@subsubsection Simple expressions + + +@geindex gcc_jit_context_new_rvalue_from_int (C function) +@anchor{topics/expressions c gcc_jit_context_new_rvalue_from_int}@anchor{30} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_rvalue_from_int (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*numeric_type, int@w{ }value) + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{int} value. +@end deffn + +@geindex gcc_jit_context_new_rvalue_from_long (C function) +@anchor{topics/expressions c gcc_jit_context_new_rvalue_from_long}@anchor{b2} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_rvalue_from_long (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*numeric_type, long@w{ }value) + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{long} value. +@end deffn + +@geindex gcc_jit_context_zero (C function) +@anchor{topics/expressions c gcc_jit_context_zero}@anchor{2b} +@deffn {C Function} gcc_jit_rvalue *gcc_jit_context_zero (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*numeric_type) + +Given a numeric type (integer or floating point), get the rvalue for +zero. Essentially this is just a shortcut for: + +@example +gcc_jit_context_new_rvalue_from_int (ctxt, numeric_type, 0) +@end example +@end deffn + +@geindex gcc_jit_context_one (C function) +@anchor{topics/expressions c gcc_jit_context_one}@anchor{2f} +@deffn {C Function} gcc_jit_rvalue *gcc_jit_context_one (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*numeric_type) + +Given a numeric type (integer or floating point), get the rvalue for +one. Essentially this is just a shortcut for: + +@example +gcc_jit_context_new_rvalue_from_int (ctxt, numeric_type, 1) +@end example +@end deffn + +@geindex gcc_jit_context_new_rvalue_from_double (C function) +@anchor{topics/expressions c gcc_jit_context_new_rvalue_from_double}@anchor{31} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_rvalue_from_double (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*numeric_type, double@w{ }value) + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{double} value. +@end deffn + +@geindex gcc_jit_context_new_rvalue_from_ptr (C function) +@anchor{topics/expressions c gcc_jit_context_new_rvalue_from_ptr}@anchor{b3} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_rvalue_from_ptr (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*pointer_type, void@w{ }*value) + +Given a pointer type, build an rvalue for the given address. +@end deffn + +@geindex gcc_jit_context_null (C function) +@anchor{topics/expressions c gcc_jit_context_null}@anchor{b4} +@deffn {C Function} gcc_jit_rvalue *gcc_jit_context_null (gcc_jit_context@w{ }*ctxt, gcc_jit_type@w{ }*pointer_type) + +Given a pointer type, build an rvalue for @code{NULL}. Essentially this +is just a shortcut for: + +@example +gcc_jit_context_new_rvalue_from_ptr (ctxt, pointer_type, NULL) +@end example +@end deffn + +@geindex gcc_jit_context_new_string_literal (C function) +@anchor{topics/expressions c gcc_jit_context_new_string_literal}@anchor{b5} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_string_literal (gcc_jit_context@w{ }*ctxt, const char@w{ }*value) + +Generate an rvalue for the given NIL-terminated string, of type +@code{GCC_JIT_TYPE_CONST_CHAR_PTR}. + +The parameter @code{value} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. +@end deffn + +@node Constructor expressions,Vector expressions,Simple expressions,Rvalues +@anchor{topics/expressions constructor-expressions}@anchor{b6} +@subsubsection Constructor expressions + + +@quotation + +The following functions make constructors for array, struct and union +types. + +The constructor rvalue can be used for assignment to locals. +It can be used to initialize global variables with +@ref{b7,,gcc_jit_global_set_initializer_rvalue()}. It can also be used as a +temporary value for function calls and return values, but its address +can’t be taken. + +Note that arrays in libgccjit do not collapse to pointers like in +C. I.e. if an array constructor is used as e.g. a return value, the whole +array would be returned by value - array constructors can be assigned to +array variables. + +The constructor can contain nested constructors. + +Note that a string literal rvalue can’t be used to construct a char array; +the latter needs one rvalue for each char. + +These entrypoints were added in @ref{b8,,LIBGCCJIT_ABI_19}; you can test for +their presence using: + +@example +#ifdef LIBGCCJIT_HAVE_CTORS +@end example +@end quotation + +@geindex gcc_jit_context_new_array_constructor (C function) +@anchor{topics/expressions c gcc_jit_context_new_array_constructor}@anchor{b9} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_array_constructor (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, size_t@w{ }num_values, gcc_jit_rvalue@w{ }**values) + +Create a constructor for an array as an rvalue. + +Returns NULL on error. @code{values} are copied and +do not have to outlive the context. + +@code{type} specifies what the constructor will build and has to be +an array. + +@code{num_values} specifies the number of elements in @code{values} and +it can’t have more elements than the array type. + +Each value in @code{values} sets the corresponding value in the array. +If the array type itself has more elements than @code{values}, the +left-over elements will be zeroed. + +Each value in @code{values} need to be the same unqualified type as the +array type’s element type. + +If @code{num_values} is 0, the @code{values} parameter will be +ignored and zero initialization will be used. + +This entrypoint was added in @ref{b8,,LIBGCCJIT_ABI_19}; you can test for its +presence using: + +@example +#ifdef LIBGCCJIT_HAVE_CTORS +@end example +@end deffn + +@geindex gcc_jit_context_new_struct_constructor (C function) +@anchor{topics/expressions c gcc_jit_context_new_struct_constructor}@anchor{ba} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_struct_constructor (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, size_t@w{ }num_values, gcc_jit_field@w{ }**fields, gcc_jit_rvalue@w{ }**values) + +Create a constructor for a struct as an rvalue. + +Returns NULL on error. The two parameter arrays are copied and +do not have to outlive the context. + +@code{type} specifies what the constructor will build and has to be +a struct. + +@code{num_values} specifies the number of elements in @code{values}. + +@code{fields} need to have the same length as @code{values}, or be NULL. + +If @code{fields} is null, the values are applied in definition order. + +Otherwise, each field in @code{fields} specifies which field in the struct to +set to the corresponding value in @code{values}. @code{fields} and @code{values} +are paired by index. + +The fields in @code{fields} have to be in definition order, but there +can be gaps. Any field in the struct that is not specified in +@code{fields} will be zeroed. + +The fields in @code{fields} need to be the same objects that were used +to create the struct. + +Each value has to have have the same unqualified type as the field +it is applied to. + +A NULL value element in @code{values} is a shorthand for zero initialization +of the corresponding field. + +If @code{num_values} is 0, the array parameters will be +ignored and zero initialization will be used. + +This entrypoint was added in @ref{b8,,LIBGCCJIT_ABI_19}; you can test for its +presence using: + +@example +#ifdef LIBGCCJIT_HAVE_CTORS +@end example +@end deffn + +@geindex gcc_jit_context_new_union_constructor (C function) +@anchor{topics/expressions c gcc_jit_context_new_union_constructor}@anchor{bb} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_union_constructor (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, gcc_jit_field@w{ }*field, gcc_jit_rvalue@w{ }*value) + +Create a constructor for a union as an rvalue. + +Returns NULL on error. + +@code{type} specifies what the constructor will build and has to be +an union. + +@code{field} specifies which field to set. If it is NULL, the first +field in the union will be set.`@w{`}field`@w{`} need to be the same object +that were used to create the union. + +@code{value} specifies what value to set the corresponding field to. +If @code{value} is NULL, zero initialization will be used. + +Each value has to have have the same unqualified type as the field +it is applied to. + +This entrypoint was added in @ref{b8,,LIBGCCJIT_ABI_19}; you can test for its +presence using: + +@example +#ifdef LIBGCCJIT_HAVE_CTORS +@end example +@end deffn + +@node Vector expressions,Unary Operations,Constructor expressions,Rvalues +@anchor{topics/expressions vector-expressions}@anchor{bc} +@subsubsection Vector expressions + + +@geindex gcc_jit_context_new_rvalue_from_vector (C function) +@anchor{topics/expressions c gcc_jit_context_new_rvalue_from_vector}@anchor{89} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_rvalue_from_vector (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*vec_type, size_t@w{ }num_elements, gcc_jit_rvalue@w{ }**elements) + +Build a vector rvalue from an array of elements. + +“vec_type” should be a vector type, created using +@ref{87,,gcc_jit_type_get_vector()}. + +“num_elements” should match that of the vector type. + +This entrypoint was added in @ref{bd,,LIBGCCJIT_ABI_10}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_new_rvalue_from_vector +@end example +@end deffn + +@node Unary Operations,Binary Operations,Vector expressions,Rvalues +@anchor{topics/expressions unary-operations}@anchor{be} +@subsubsection Unary Operations + + +@geindex gcc_jit_context_new_unary_op (C function) +@anchor{topics/expressions c gcc_jit_context_new_unary_op}@anchor{bf} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_unary_op (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, enum gcc_jit_unary_op@w{ }op, gcc_jit_type@w{ }*result_type, gcc_jit_rvalue@w{ }*rvalue) + +Build a unary operation out of an input rvalue. + +The parameter @code{result_type} must be a numeric type. +@end deffn + +@geindex gcc_jit_unary_op (C type) +@anchor{topics/expressions c gcc_jit_unary_op}@anchor{c0} +@deffn {C Type} enum gcc_jit_unary_op +@end deffn + +The available unary operations are: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxx} +@headitem + +Unary Operation + +@tab + +C equivalent + +@item + +@ref{c1,,GCC_JIT_UNARY_OP_MINUS} + +@tab + +@cite{-(EXPR)} + +@item + +@ref{c2,,GCC_JIT_UNARY_OP_BITWISE_NEGATE} + +@tab + +@cite{~(EXPR)} + +@item + +@ref{c3,,GCC_JIT_UNARY_OP_LOGICAL_NEGATE} + +@tab + +@cite{!(EXPR)} + +@item + +@ref{c4,,GCC_JIT_UNARY_OP_ABS} + +@tab + +@cite{abs (EXPR)} + +@end multitable + + +@geindex GCC_JIT_UNARY_OP_MINUS (C macro) +@anchor{topics/expressions c GCC_JIT_UNARY_OP_MINUS}@anchor{c1} +@deffn {C Macro} GCC_JIT_UNARY_OP_MINUS + +Negate an arithmetic value; analogous to: + +@example +-(EXPR) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_UNARY_OP_BITWISE_NEGATE (C macro) +@anchor{topics/expressions c GCC_JIT_UNARY_OP_BITWISE_NEGATE}@anchor{c2} +@deffn {C Macro} GCC_JIT_UNARY_OP_BITWISE_NEGATE + +Bitwise negation of an integer value (one’s complement); analogous +to: + +@example +~(EXPR) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_UNARY_OP_LOGICAL_NEGATE (C macro) +@anchor{topics/expressions c GCC_JIT_UNARY_OP_LOGICAL_NEGATE}@anchor{c3} +@deffn {C Macro} GCC_JIT_UNARY_OP_LOGICAL_NEGATE + +Logical negation of an arithmetic or pointer value; analogous to: + +@example +!(EXPR) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_UNARY_OP_ABS (C macro) +@anchor{topics/expressions c GCC_JIT_UNARY_OP_ABS}@anchor{c4} +@deffn {C Macro} GCC_JIT_UNARY_OP_ABS + +Absolute value of an arithmetic expression; analogous to: + +@example +abs (EXPR) +@end example + +in C. +@end deffn + +@node Binary Operations,Comparisons,Unary Operations,Rvalues +@anchor{topics/expressions binary-operations}@anchor{c5} +@subsubsection Binary Operations + + +@geindex gcc_jit_context_new_binary_op (C function) +@anchor{topics/expressions c gcc_jit_context_new_binary_op}@anchor{12} +@deffn {C Function} gcc_jit_rvalue *gcc_jit_context_new_binary_op (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, enum gcc_jit_binary_op@w{ }op, gcc_jit_type@w{ }*result_type, gcc_jit_rvalue@w{ }*a, gcc_jit_rvalue@w{ }*b) + +Build a binary operation out of two constituent rvalues. + +The parameter @code{result_type} must be a numeric type. +@end deffn + +@geindex gcc_jit_binary_op (C type) +@anchor{topics/expressions c gcc_jit_binary_op}@anchor{c6} +@deffn {C Type} enum gcc_jit_binary_op +@end deffn + +The available binary operations are: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxx} +@headitem + +Binary Operation + +@tab + +C equivalent + +@item + +@ref{c7,,GCC_JIT_BINARY_OP_PLUS} + +@tab + +@cite{x + y} + +@item + +@ref{c8,,GCC_JIT_BINARY_OP_MINUS} + +@tab + +@cite{x - y} + +@item + +@ref{c9,,GCC_JIT_BINARY_OP_MULT} + +@tab + +@cite{x * y} + +@item + +@ref{ca,,GCC_JIT_BINARY_OP_DIVIDE} + +@tab + +@cite{x / y} + +@item + +@ref{cb,,GCC_JIT_BINARY_OP_MODULO} + +@tab + +@cite{x % y} + +@item + +@ref{cc,,GCC_JIT_BINARY_OP_BITWISE_AND} + +@tab + +@cite{x & y} + +@item + +@ref{cd,,GCC_JIT_BINARY_OP_BITWISE_XOR} + +@tab + +@cite{x ^ y} + +@item + +@ref{ce,,GCC_JIT_BINARY_OP_BITWISE_OR} + +@tab + +@cite{x | y} + +@item + +@ref{cf,,GCC_JIT_BINARY_OP_LOGICAL_AND} + +@tab + +@cite{x && y} + +@item + +@ref{d0,,GCC_JIT_BINARY_OP_LOGICAL_OR} + +@tab + +@cite{x || y} + +@item + +@ref{d1,,GCC_JIT_BINARY_OP_LSHIFT} + +@tab + +@cite{x << y} + +@item + +@ref{d2,,GCC_JIT_BINARY_OP_RSHIFT} + +@tab + +@cite{x >> y} + +@end multitable + + +@geindex GCC_JIT_BINARY_OP_PLUS (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_PLUS}@anchor{c7} +@deffn {C Macro} GCC_JIT_BINARY_OP_PLUS + +Addition of arithmetic values; analogous to: + +@example +(EXPR_A) + (EXPR_B) +@end example + +in C. + +For pointer addition, use @ref{d3,,gcc_jit_context_new_array_access()}. +@end deffn + +@geindex GCC_JIT_BINARY_OP_MINUS (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_MINUS}@anchor{c8} +@deffn {C Macro} GCC_JIT_BINARY_OP_MINUS + +Subtraction of arithmetic values; analogous to: + +@example +(EXPR_A) - (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_MULT (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_MULT}@anchor{c9} +@deffn {C Macro} GCC_JIT_BINARY_OP_MULT + +Multiplication of a pair of arithmetic values; analogous to: + +@example +(EXPR_A) * (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_DIVIDE (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_DIVIDE}@anchor{ca} +@deffn {C Macro} GCC_JIT_BINARY_OP_DIVIDE + +Quotient of division of arithmetic values; analogous to: + +@example +(EXPR_A) / (EXPR_B) +@end example + +in C. + +The result type affects the kind of division: if the result type is +integer-based, then the result is truncated towards zero, whereas +a floating-point result type indicates floating-point division. +@end deffn + +@geindex GCC_JIT_BINARY_OP_MODULO (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_MODULO}@anchor{cb} +@deffn {C Macro} GCC_JIT_BINARY_OP_MODULO + +Remainder of division of arithmetic values; analogous to: + +@example +(EXPR_A) % (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_BITWISE_AND (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_BITWISE_AND}@anchor{cc} +@deffn {C Macro} GCC_JIT_BINARY_OP_BITWISE_AND + +Bitwise AND; analogous to: + +@example +(EXPR_A) & (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_BITWISE_XOR (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_BITWISE_XOR}@anchor{cd} +@deffn {C Macro} GCC_JIT_BINARY_OP_BITWISE_XOR + +Bitwise exclusive OR; analogous to: + +@example +(EXPR_A) ^ (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_BITWISE_OR (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_BITWISE_OR}@anchor{ce} +@deffn {C Macro} GCC_JIT_BINARY_OP_BITWISE_OR + +Bitwise inclusive OR; analogous to: + +@example +(EXPR_A) | (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_LOGICAL_AND (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_LOGICAL_AND}@anchor{cf} +@deffn {C Macro} GCC_JIT_BINARY_OP_LOGICAL_AND + +Logical AND; analogous to: + +@example +(EXPR_A) && (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_LOGICAL_OR (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_LOGICAL_OR}@anchor{d0} +@deffn {C Macro} GCC_JIT_BINARY_OP_LOGICAL_OR + +Logical OR; analogous to: + +@example +(EXPR_A) || (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_LSHIFT (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_LSHIFT}@anchor{d1} +@deffn {C Macro} GCC_JIT_BINARY_OP_LSHIFT + +Left shift; analogous to: + +@example +(EXPR_A) << (EXPR_B) +@end example + +in C. +@end deffn + +@geindex GCC_JIT_BINARY_OP_RSHIFT (C macro) +@anchor{topics/expressions c GCC_JIT_BINARY_OP_RSHIFT}@anchor{d2} +@deffn {C Macro} GCC_JIT_BINARY_OP_RSHIFT + +Right shift; analogous to: + +@example +(EXPR_A) >> (EXPR_B) +@end example + +in C. +@end deffn + +@node Comparisons,Function calls,Binary Operations,Rvalues +@anchor{topics/expressions comparisons}@anchor{d4} +@subsubsection Comparisons + + +@geindex gcc_jit_context_new_comparison (C function) +@anchor{topics/expressions c gcc_jit_context_new_comparison}@anchor{2c} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_comparison (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, enum gcc_jit_comparison@w{ }op, gcc_jit_rvalue@w{ }*a, gcc_jit_rvalue@w{ }*b) + +Build a boolean rvalue out of the comparison of two other rvalues. +@end deffn + +@geindex gcc_jit_comparison (C type) +@anchor{topics/expressions c gcc_jit_comparison}@anchor{d5} +@deffn {C Type} enum gcc_jit_comparison +@end deffn + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxx} +@headitem + +Comparison + +@tab + +C equivalent + +@item + +@code{GCC_JIT_COMPARISON_EQ} + +@tab + +@cite{x == y} + +@item + +@code{GCC_JIT_COMPARISON_NE} + +@tab + +@cite{x != y} + +@item + +@code{GCC_JIT_COMPARISON_LT} + +@tab + +@cite{x < y} + +@item + +@code{GCC_JIT_COMPARISON_LE} + +@tab + +@cite{x <= y} + +@item + +@code{GCC_JIT_COMPARISON_GT} + +@tab + +@cite{x > y} + +@item + +@code{GCC_JIT_COMPARISON_GE} + +@tab + +@cite{x >= y} + +@end multitable + + +@node Function calls,Function pointers,Comparisons,Rvalues +@anchor{topics/expressions function-calls}@anchor{d6} +@subsubsection Function calls + + +@geindex gcc_jit_context_new_call (C function) +@anchor{topics/expressions c gcc_jit_context_new_call}@anchor{d7} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_call (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_function@w{ }*func, int@w{ }numargs, gcc_jit_rvalue@w{ }**args) + +Given a function and the given table of argument rvalues, construct a +call to the function, with the result as an rvalue. + +@cartouche +@quotation Note +@ref{d7,,gcc_jit_context_new_call()} merely builds a +@ref{13,,gcc_jit_rvalue} i.e. an expression that can be evaluated, +perhaps as part of a more complicated expression. +The call @emph{won’t} happen unless you add a statement to a function +that evaluates the expression. + +For example, if you want to call a function and discard the result +(or to call a function with @code{void} return type), use +@ref{d8,,gcc_jit_block_add_eval()}: + +@example +/* Add "(void)printf (arg0, arg1);". */ +gcc_jit_block_add_eval ( + block, NULL, + gcc_jit_context_new_call ( + ctxt, + NULL, + printf_func, + 2, args)); +@end example +@end quotation +@end cartouche +@end deffn + +@geindex gcc_jit_context_new_call_through_ptr (C function) +@anchor{topics/expressions c gcc_jit_context_new_call_through_ptr}@anchor{d9} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_call_through_ptr (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*fn_ptr, int@w{ }numargs, gcc_jit_rvalue@w{ }**args) + +Given an rvalue of function pointer type (e.g. from +@ref{97,,gcc_jit_context_new_function_ptr_type()}), and the given table of +argument rvalues, construct a call to the function pointer, with the +result as an rvalue. + +@cartouche +@quotation Note +The same caveat as for @ref{d7,,gcc_jit_context_new_call()} applies. +@end quotation +@end cartouche +@end deffn + +@geindex gcc_jit_rvalue_set_bool_require_tail_call (C function) +@anchor{topics/expressions c gcc_jit_rvalue_set_bool_require_tail_call}@anchor{da} +@deffn {C Function} void gcc_jit_rvalue_set_bool_require_tail_call (gcc_jit_rvalue@w{ }*call, int@w{ }require_tail_call) + +Given an @ref{13,,gcc_jit_rvalue} for a call created through +@ref{d7,,gcc_jit_context_new_call()} or +@ref{d9,,gcc_jit_context_new_call_through_ptr()}, mark/clear the +call as needing tail-call optimization. The optimizer will +attempt to optimize the call into a jump instruction; if it is +unable to do do, an error will be emitted. + +This may be useful when implementing functions that use the +continuation-passing style (e.g. for functional programming +languages), in which every function “returns” by calling a +“continuation” function pointer. This call must be +guaranteed to be implemented as a jump, otherwise the program +could consume an arbitrary amount of stack space as it executed. + +This entrypoint was added in @ref{db,,LIBGCCJIT_ABI_6}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_rvalue_set_bool_require_tail_call +@end example +@end deffn + +@node Function pointers,Type-coercion,Function calls,Rvalues +@anchor{topics/expressions function-pointers}@anchor{dc} +@subsubsection Function pointers + + +Function pointers can be obtained: + +@quotation + + +@itemize * + +@item +from a @ref{29,,gcc_jit_function} using +@ref{dd,,gcc_jit_function_get_address()}, or + +@item +from an existing function using +@ref{b3,,gcc_jit_context_new_rvalue_from_ptr()}, +using a function pointer type obtained using +@ref{97,,gcc_jit_context_new_function_ptr_type()}. +@end itemize +@end quotation + +@node Type-coercion,,Function pointers,Rvalues +@anchor{topics/expressions type-coercion}@anchor{de} +@subsubsection Type-coercion + + +@geindex gcc_jit_context_new_cast (C function) +@anchor{topics/expressions c gcc_jit_context_new_cast}@anchor{df} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_cast (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*rvalue, gcc_jit_type@w{ }*type) + +Given an rvalue of T, construct another rvalue of another type. + +Currently only a limited set of conversions are possible: + +@quotation + + +@itemize * + +@item +int <-> float + +@item +int <-> bool + +@item +P* <-> Q*, for pointer types P and Q +@end itemize +@end quotation +@end deffn + +@geindex gcc_jit_context_new_bitcast (C function) +@anchor{topics/expressions c gcc_jit_context_new_bitcast}@anchor{e0} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_context_new_bitcast (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*rvalue, gcc_jit_type@w{ }*type) + +Given an rvalue of T, bitcast it to another type, meaning that this will +generate a new rvalue by interpreting the bits of @code{rvalue} to the layout +of @code{type}. + +The type of rvalue must be the same size as the size of @code{type}. + +This entrypoint was added in @ref{e1,,LIBGCCJIT_ABI_21}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_new_bitcast +@end example +@end deffn + +@node Lvalues,Working with pointers structs and unions,Rvalues,Expressions +@anchor{topics/expressions lvalues}@anchor{e2} +@subsection Lvalues + + +@geindex gcc_jit_lvalue (C type) +@anchor{topics/expressions c gcc_jit_lvalue}@anchor{24} +@deffn {C Type} gcc_jit_lvalue +@end deffn + +An lvalue is something that can of the @emph{left}-hand side of an assignment: +a storage area (such as a variable). It is also usable as an rvalue, +where the rvalue is computed by reading from the storage area. + +@geindex gcc_jit_lvalue_as_object (C function) +@anchor{topics/expressions c gcc_jit_lvalue_as_object}@anchor{e3} +@deffn {C Function} gcc_jit_object * gcc_jit_lvalue_as_object (gcc_jit_lvalue@w{ }*lvalue) + +Upcast an lvalue to be an object. +@end deffn + +@geindex gcc_jit_lvalue_as_rvalue (C function) +@anchor{topics/expressions c gcc_jit_lvalue_as_rvalue}@anchor{e4} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_lvalue_as_rvalue (gcc_jit_lvalue@w{ }*lvalue) + +Upcast an lvalue to be an rvalue. +@end deffn + +@geindex gcc_jit_lvalue_get_address (C function) +@anchor{topics/expressions c gcc_jit_lvalue_get_address}@anchor{e5} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_lvalue_get_address (gcc_jit_lvalue@w{ }*lvalue, gcc_jit_location@w{ }*loc) + +Take the address of an lvalue; analogous to: + +@example +&(EXPR) +@end example + +in C. +@end deffn + +@geindex gcc_jit_lvalue_set_tls_model (C function) +@anchor{topics/expressions c gcc_jit_lvalue_set_tls_model}@anchor{e6} +@deffn {C Function} void gcc_jit_lvalue_set_tls_model (gcc_jit_lvalue@w{ }*lvalue, enum gcc_jit_tls_model@w{ }model) + +Make a variable a thread-local variable. + +The “model” parameter determines the thread-local storage model of the “lvalue”: + +@geindex gcc_jit_tls_model (C type) +@anchor{topics/expressions c gcc_jit_tls_model}@anchor{e7} +@deffn {C Type} enum gcc_jit_tls_model +@end deffn + +@geindex GCC_JIT_TLS_MODEL_NONE (C macro) +@anchor{topics/expressions c GCC_JIT_TLS_MODEL_NONE}@anchor{e8} +@deffn {C Macro} GCC_JIT_TLS_MODEL_NONE + +Don’t set the TLS model. +@end deffn + +@geindex GCC_JIT_TLS_MODEL_GLOBAL_DYNAMIC (C macro) +@anchor{topics/expressions c GCC_JIT_TLS_MODEL_GLOBAL_DYNAMIC}@anchor{e9} +@deffn {C Macro} GCC_JIT_TLS_MODEL_GLOBAL_DYNAMIC +@end deffn + +@geindex GCC_JIT_TLS_MODEL_LOCAL_DYNAMIC (C macro) +@anchor{topics/expressions c GCC_JIT_TLS_MODEL_LOCAL_DYNAMIC}@anchor{ea} +@deffn {C Macro} GCC_JIT_TLS_MODEL_LOCAL_DYNAMIC +@end deffn + +@geindex GCC_JIT_TLS_MODEL_INITIAL_EXEC (C macro) +@anchor{topics/expressions c GCC_JIT_TLS_MODEL_INITIAL_EXEC}@anchor{eb} +@deffn {C Macro} GCC_JIT_TLS_MODEL_INITIAL_EXEC +@end deffn + +@geindex GCC_JIT_TLS_MODEL_LOCAL_EXEC (C macro) +@anchor{topics/expressions c GCC_JIT_TLS_MODEL_LOCAL_EXEC}@anchor{ec} +@deffn {C Macro} GCC_JIT_TLS_MODEL_LOCAL_EXEC +@end deffn + +This is analogous to: + +@example +_Thread_local int foo __attribute__ ((tls_model("MODEL"))); +@end example + +in C. + +This entrypoint was added in @ref{ed,,LIBGCCJIT_ABI_17}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_lvalue_set_tls_model +@end example +@end deffn + +@geindex gcc_jit_lvalue_set_link_section (C function) +@anchor{topics/expressions c gcc_jit_lvalue_set_link_section}@anchor{ee} +@deffn {C Function} void gcc_jit_lvalue_set_link_section (gcc_jit_lvalue@w{ }*lvalue, const char@w{ }*section_name) + +Set the link section of a variable. +The parameter @code{section_name} must be non-NULL and must contain the +leading dot. Analogous to: + +@example +int variable __attribute__((section(".section"))); +@end example + +in C. + +This entrypoint was added in @ref{ef,,LIBGCCJIT_ABI_18}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_lvalue_set_link_section +@end example +@end deffn + + +@deffn {C Function} void gcc_jit_lvalue_set_register_name (gcc_jit_lvalue *lvalue, const char *reg_name); + +Set the register name of a variable. +The parameter @code{reg_name} must be non-NULL. Analogous to: + +@example +register int variable asm ("r12"); +@end example + +in C. + +This entrypoint was added in @ref{f0,,LIBGCCJIT_ABI_22}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_lvalue_set_register_name +@end example +@end deffn + +@geindex gcc_jit_lvalue_set_alignment (C function) +@anchor{topics/expressions c gcc_jit_lvalue_set_alignment}@anchor{f1} +@deffn {C Function} void gcc_jit_lvalue_set_alignment (gcc_jit_lvalue@w{ }*lvalue, unsigned@w{ }bytes) + +Set the alignment of a variable, in bytes. +Analogous to: + +@example +int variable __attribute__((aligned (16))); +@end example + +in C. + +This entrypoint was added in @ref{f2,,LIBGCCJIT_ABI_24}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_ALIGNMENT +@end example +@end deffn + +@geindex gcc_jit_lvalue_get_alignment (C function) +@anchor{topics/expressions c gcc_jit_lvalue_get_alignment}@anchor{f3} +@deffn {C Function} unsigned gcc_jit_lvalue_get_alignment (gcc_jit_lvalue@w{ }*lvalue) + +Return the alignment of a variable set by @code{gcc_jit_lvalue_set_alignment}. +Return 0 if the alignment was not set. Analogous to: + +@example +_Alignof (variable) +@end example + +in C. + +This entrypoint was added in @ref{f2,,LIBGCCJIT_ABI_24}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_ALIGNMENT +@end example +@end deffn + +@menu +* Global variables:: + +@end menu + +@node Global variables,,,Lvalues +@anchor{topics/expressions global-variables}@anchor{f4} +@subsubsection Global variables + + +@geindex gcc_jit_context_new_global (C function) +@anchor{topics/expressions c gcc_jit_context_new_global}@anchor{f5} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_context_new_global (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, enum gcc_jit_global_kind@w{ }kind, gcc_jit_type@w{ }*type, const char@w{ }*name) + +Add a new global variable of the given type and name to the context. + +The parameter @code{type} must be non-@cite{void}. + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. + +The “kind” parameter determines the visibility of the “global” outside +of the @ref{16,,gcc_jit_result}: + +@geindex gcc_jit_global_kind (C type) +@anchor{topics/expressions c gcc_jit_global_kind}@anchor{f6} +@deffn {C Type} enum gcc_jit_global_kind +@end deffn + +@geindex GCC_JIT_GLOBAL_EXPORTED (C macro) +@anchor{topics/expressions c GCC_JIT_GLOBAL_EXPORTED}@anchor{f7} +@deffn {C Macro} GCC_JIT_GLOBAL_EXPORTED + +Global is defined by the client code and is visible +by name outside of this JIT context via +@ref{f8,,gcc_jit_result_get_global()} (and this value is required for +the global to be accessible via that entrypoint). +@end deffn + +@geindex GCC_JIT_GLOBAL_INTERNAL (C macro) +@anchor{topics/expressions c GCC_JIT_GLOBAL_INTERNAL}@anchor{f9} +@deffn {C Macro} GCC_JIT_GLOBAL_INTERNAL + +Global is defined by the client code, but is invisible +outside of it. Analogous to a “static” global within a .c file. +Specifically, the variable will only be visible within this +context and within child contexts. +@end deffn + +@geindex GCC_JIT_GLOBAL_IMPORTED (C macro) +@anchor{topics/expressions c GCC_JIT_GLOBAL_IMPORTED}@anchor{fa} +@deffn {C Macro} GCC_JIT_GLOBAL_IMPORTED + +Global is not defined by the client code; we’re merely +referring to it. Analogous to using an “extern” global from a +header file. +@end deffn +@end deffn + +@geindex gcc_jit_global_set_initializer (C function) +@anchor{topics/expressions c gcc_jit_global_set_initializer}@anchor{fb} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_global_set_initializer (gcc_jit_lvalue@w{ }*global, const void@w{ }*blob, size_t@w{ }num_bytes) + +Set an initializer for @code{global} using the memory content pointed +by @code{blob} for @code{num_bytes}. @code{global} must be an array of an +integral type. Return the global itself. + +The parameter @code{blob} must be non-NULL. The call copies the memory +pointed by @code{blob} for @code{num_bytes} bytes, so it is valid to pass +in a pointer to an on-stack buffer. The content will be stored in +the compilation unit and used as initialization value of the array. + +This entrypoint was added in @ref{fc,,LIBGCCJIT_ABI_14}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_global_set_initializer +@end example +@end deffn + +@geindex gcc_jit_global_set_initializer_rvalue (C function) +@anchor{topics/expressions c gcc_jit_global_set_initializer_rvalue}@anchor{b7} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_global_set_initializer_rvalue (gcc_jit_lvalue@w{ }*global, gcc_jit_rvalue@w{ }*init_value) + +Set the initial value of a global with an rvalue. + +The rvalue needs to be a constant expression, e.g. no function calls. + +The global can’t have the @code{kind} @ref{fa,,GCC_JIT_GLOBAL_IMPORTED}. + +As a non-comprehensive example it is OK to do the equivalent of: + +@example +int foo = 3 * 2; /* rvalue from gcc_jit_context_new_binary_op. */ +int arr[] = @{1,2,3,4@}; /* rvalue from gcc_jit_context_new_constructor. */ +int *bar = &arr[2] + 1; /* rvalue from nested "get address" of "array access". */ +const int baz = 3; /* rvalue from gcc_jit_context_rvalue_from_int. */ +int boz = baz; /* rvalue from gcc_jit_lvalue_as_rvalue. */ +@end example + +Use together with @ref{ba,,gcc_jit_context_new_struct_constructor()}, +@ref{bb,,gcc_jit_context_new_union_constructor()}, @ref{b9,,gcc_jit_context_new_array_constructor()} +to initialize structs, unions and arrays. + +On success, returns the @code{global} parameter unchanged. Otherwise, @code{NULL}. + +This entrypoint was added in @ref{b8,,LIBGCCJIT_ABI_19}; you can test for its +presence using: + +@example +#ifdef LIBGCCJIT_HAVE_CTORS +@end example +@end deffn + +@node Working with pointers structs and unions,,Lvalues,Expressions +@anchor{topics/expressions working-with-pointers-structs-and-unions}@anchor{fd} +@subsection Working with pointers, structs and unions + + +@geindex gcc_jit_rvalue_dereference (C function) +@anchor{topics/expressions c gcc_jit_rvalue_dereference}@anchor{fe} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_rvalue_dereference (gcc_jit_rvalue@w{ }*rvalue, gcc_jit_location@w{ }*loc) + +Given an rvalue of pointer type @code{T *}, dereferencing the pointer, +getting an lvalue of type @code{T}. Analogous to: + +@example +*(EXPR) +@end example + +in C. +@end deffn + +Field access is provided separately for both lvalues and rvalues. + +@geindex gcc_jit_lvalue_access_field (C function) +@anchor{topics/expressions c gcc_jit_lvalue_access_field}@anchor{ff} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_lvalue_access_field (gcc_jit_lvalue@w{ }*struct_, gcc_jit_location@w{ }*loc, gcc_jit_field@w{ }*field) + +Given an lvalue of struct or union type, access the given field, +getting an lvalue of the field’s type. Analogous to: + +@example +(EXPR).field = ...; +@end example + +in C. +@end deffn + +@geindex gcc_jit_rvalue_access_field (C function) +@anchor{topics/expressions c gcc_jit_rvalue_access_field}@anchor{100} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_rvalue_access_field (gcc_jit_rvalue@w{ }*struct_, gcc_jit_location@w{ }*loc, gcc_jit_field@w{ }*field) + +Given an rvalue of struct or union type, access the given field +as an rvalue. Analogous to: + +@example +(EXPR).field +@end example + +in C. +@end deffn + +@geindex gcc_jit_rvalue_dereference_field (C function) +@anchor{topics/expressions c gcc_jit_rvalue_dereference_field}@anchor{101} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_rvalue_dereference_field (gcc_jit_rvalue@w{ }*ptr, gcc_jit_location@w{ }*loc, gcc_jit_field@w{ }*field) + +Given an rvalue of pointer type @code{T *} where T is of struct or union +type, access the given field as an lvalue. Analogous to: + +@example +(EXPR)->field +@end example + +in C, itself equivalent to @code{(*EXPR).FIELD}. +@end deffn + +@geindex gcc_jit_context_new_array_access (C function) +@anchor{topics/expressions c gcc_jit_context_new_array_access}@anchor{d3} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_context_new_array_access (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*ptr, gcc_jit_rvalue@w{ }*index) + +Given an rvalue of pointer type @code{T *}, get at the element @cite{T} at +the given index, using standard C array indexing rules i.e. each +increment of @code{index} corresponds to @code{sizeof(T)} bytes. +Analogous to: + +@example +PTR[INDEX] +@end example + +in C (or, indeed, to @code{PTR + INDEX}). +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Creating and using functions,Function pointers<2>,Expressions,Topic Reference +@anchor{topics/functions doc}@anchor{102}@anchor{topics/functions creating-and-using-functions}@anchor{103} +@section Creating and using functions + + +@menu +* Params:: +* Functions:: +* Blocks:: +* Statements:: + +@end menu + +@node Params,Functions,,Creating and using functions +@anchor{topics/functions params}@anchor{104} +@subsection Params + + +@geindex gcc_jit_param (C type) +@anchor{topics/functions c gcc_jit_param}@anchor{25} +@deffn {C Type} gcc_jit_param + +A @cite{gcc_jit_param} represents a parameter to a function. +@end deffn + +@geindex gcc_jit_context_new_param (C function) +@anchor{topics/functions c gcc_jit_context_new_param}@anchor{10} +@deffn {C Function} gcc_jit_param * gcc_jit_context_new_param (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, const char@w{ }*name) + +In preparation for creating a function, create a new parameter of the +given type and name. + +The parameter @code{type} must be non-@cite{void}. + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. +@end deffn + +Parameters are lvalues, and thus are also rvalues (and objects), so the +following upcasts are available: + +@geindex gcc_jit_param_as_lvalue (C function) +@anchor{topics/functions c gcc_jit_param_as_lvalue}@anchor{105} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_param_as_lvalue (gcc_jit_param@w{ }*param) + +Upcasting from param to lvalue. +@end deffn + +@geindex gcc_jit_param_as_rvalue (C function) +@anchor{topics/functions c gcc_jit_param_as_rvalue}@anchor{106} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_param_as_rvalue (gcc_jit_param@w{ }*param) + +Upcasting from param to rvalue. +@end deffn + +@geindex gcc_jit_param_as_object (C function) +@anchor{topics/functions c gcc_jit_param_as_object}@anchor{107} +@deffn {C Function} gcc_jit_object * gcc_jit_param_as_object (gcc_jit_param@w{ }*param) + +Upcasting from param to object. +@end deffn + +@node Functions,Blocks,Params,Creating and using functions +@anchor{topics/functions functions}@anchor{108} +@subsection Functions + + +@geindex gcc_jit_function (C type) +@anchor{topics/functions c gcc_jit_function}@anchor{29} +@deffn {C Type} gcc_jit_function + +A @cite{gcc_jit_function} represents a function - either one that we’re +creating ourselves, or one that we’re referencing. +@end deffn + +@geindex gcc_jit_context_new_function (C function) +@anchor{topics/functions c gcc_jit_context_new_function}@anchor{11} +@deffn {C Function} gcc_jit_function * gcc_jit_context_new_function (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, enum gcc_jit_function_kind@w{ }kind, gcc_jit_type@w{ }*return_type, const char@w{ }*name, int@w{ }num_params, gcc_jit_param@w{ }**params, int@w{ }is_variadic) + +Create a gcc_jit_function with the given name and parameters. + +@geindex gcc_jit_function_kind (C type) +@anchor{topics/functions c gcc_jit_function_kind}@anchor{109} +@deffn {C Type} enum gcc_jit_function_kind +@end deffn + +This enum controls the kind of function created, and has the following +values: + +@quotation + +@geindex GCC_JIT_FUNCTION_EXPORTED (C macro) +@anchor{topics/functions c GCC_JIT_FUNCTION_EXPORTED}@anchor{10a} +@deffn {C Macro} GCC_JIT_FUNCTION_EXPORTED + +Function is defined by the client code and visible +by name outside of the JIT. + +This value is required if you want to extract machine code +for this function from a @ref{16,,gcc_jit_result} via +@ref{17,,gcc_jit_result_get_code()}. +@end deffn + +@geindex GCC_JIT_FUNCTION_INTERNAL (C macro) +@anchor{topics/functions c GCC_JIT_FUNCTION_INTERNAL}@anchor{10b} +@deffn {C Macro} GCC_JIT_FUNCTION_INTERNAL + +Function is defined by the client code, but is invisible +outside of the JIT. Analogous to a “static” function. +@end deffn + +@geindex GCC_JIT_FUNCTION_IMPORTED (C macro) +@anchor{topics/functions c GCC_JIT_FUNCTION_IMPORTED}@anchor{10c} +@deffn {C Macro} GCC_JIT_FUNCTION_IMPORTED + +Function is not defined by the client code; we’re merely +referring to it. Analogous to using an “extern” function from a +header file. +@end deffn + +@geindex GCC_JIT_FUNCTION_ALWAYS_INLINE (C macro) +@anchor{topics/functions c GCC_JIT_FUNCTION_ALWAYS_INLINE}@anchor{10d} +@deffn {C Macro} GCC_JIT_FUNCTION_ALWAYS_INLINE + +Function is only ever inlined into other functions, and is +invisible outside of the JIT. + +Analogous to prefixing with @code{inline} and adding +@code{__attribute__((always_inline))} + +Inlining will only occur when the optimization level is +above 0; when optimization is off, this is essentially the +same as GCC_JIT_FUNCTION_INTERNAL. +@end deffn +@end quotation + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. +@end deffn + +@geindex gcc_jit_context_get_builtin_function (C function) +@anchor{topics/functions c gcc_jit_context_get_builtin_function}@anchor{10e} +@deffn {C Function} gcc_jit_function * gcc_jit_context_get_builtin_function (gcc_jit_context@w{ }*ctxt, const char@w{ }*name) + +Get the @ref{29,,gcc_jit_function} for the built-in function with the +given name. For example: + +@example +gcc_jit_function *fn + = gcc_jit_context_get_builtin_function (ctxt, "__builtin_memcpy"); +@end example + +@cartouche +@quotation Note +Due to technical limitations with how libgccjit interacts with +the insides of GCC, not all built-in functions are supported. More +precisely, not all types are supported for parameters of built-in +functions from libgccjit. Attempts to get a built-in function that +uses such a parameter will lead to an error being emitted within +the context. +@end quotation +@end cartouche +@end deffn + +@geindex gcc_jit_function_as_object (C function) +@anchor{topics/functions c gcc_jit_function_as_object}@anchor{10f} +@deffn {C Function} gcc_jit_object * gcc_jit_function_as_object (gcc_jit_function@w{ }*func) + +Upcasting from function to object. +@end deffn + +@geindex gcc_jit_function_get_param (C function) +@anchor{topics/functions c gcc_jit_function_get_param}@anchor{110} +@deffn {C Function} gcc_jit_param * gcc_jit_function_get_param (gcc_jit_function@w{ }*func, int@w{ }index) + +Get the param of the given index (0-based). +@end deffn + +@geindex gcc_jit_function_dump_to_dot (C function) +@anchor{topics/functions c gcc_jit_function_dump_to_dot}@anchor{33} +@deffn {C Function} void gcc_jit_function_dump_to_dot (gcc_jit_function@w{ }*func, const char@w{ }*path) + +Emit the function in graphviz format to the given path. +@end deffn + +@geindex gcc_jit_function_new_local (C function) +@anchor{topics/functions c gcc_jit_function_new_local}@anchor{26} +@deffn {C Function} gcc_jit_lvalue * gcc_jit_function_new_local (gcc_jit_function@w{ }*func, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*type, const char@w{ }*name) + +Create a new local variable within the function, of the given type and +name. + +The parameter @code{type} must be non-@cite{void}. + +The parameter @code{name} must be non-NULL. The call takes a copy of the +underlying string, so it is valid to pass in a pointer to an on-stack +buffer. +@end deffn + +@geindex gcc_jit_function_get_param_count (C function) +@anchor{topics/functions c gcc_jit_function_get_param_count}@anchor{111} +@deffn {C Function} size_t gcc_jit_function_get_param_count (gcc_jit_function@w{ }*func) + +Get the number of parameters of the function. +@end deffn + +@geindex gcc_jit_function_get_return_type (C function) +@anchor{topics/functions c gcc_jit_function_get_return_type}@anchor{112} +@deffn {C Function} gcc_jit_type * gcc_jit_function_get_return_type (gcc_jit_function@w{ }*func) + +Get the return type of the function. + +The API entrypoints relating to getting info about parameters and return +types: + +@quotation + + +@itemize * + +@item +@ref{112,,gcc_jit_function_get_return_type()} + +@item +@ref{111,,gcc_jit_function_get_param_count()} +@end itemize +@end quotation + +were added in @ref{a8,,LIBGCCJIT_ABI_16}; you can test for their presence +using + +@example +#ifdef LIBGCCJIT_HAVE_REFLECTION +@end example + +@geindex gcc_jit_case (C type) +@anchor{topics/functions c gcc_jit_case}@anchor{113} +@deffn {C Type} gcc_jit_case +@end deffn +@end deffn + +@node Blocks,Statements,Functions,Creating and using functions +@anchor{topics/functions blocks}@anchor{114} +@subsection Blocks + + +@geindex gcc_jit_block (C type) +@anchor{topics/functions c gcc_jit_block}@anchor{28} +@deffn {C Type} gcc_jit_block + +A @cite{gcc_jit_block} represents a basic block within a function i.e. a +sequence of statements with a single entry point and a single exit +point. + +The first basic block that you create within a function will +be the entrypoint. + +Each basic block that you create within a function must be +terminated, either with a conditional, a jump, a return, or a +switch. + +It’s legal to have multiple basic blocks that return within +one function. +@end deffn + +@geindex gcc_jit_function_new_block (C function) +@anchor{topics/functions c gcc_jit_function_new_block}@anchor{115} +@deffn {C Function} gcc_jit_block * gcc_jit_function_new_block (gcc_jit_function@w{ }*func, const char@w{ }*name) + +Create a basic block of the given name. The name may be NULL, but +providing meaningful names is often helpful when debugging: it may +show up in dumps of the internal representation, and in error +messages. It is copied, so the input buffer does not need to outlive +the call; you can pass in a pointer to an on-stack buffer, e.g.: + +@example +for (pc = 0; pc < fn->fn_num_ops; pc++) + @{ + char buf[16]; + sprintf (buf, "instr%i", pc); + state.op_blocks[pc] = gcc_jit_function_new_block (state.fn, buf); + @} +@end example +@end deffn + +@geindex gcc_jit_block_as_object (C function) +@anchor{topics/functions c gcc_jit_block_as_object}@anchor{116} +@deffn {C Function} gcc_jit_object * gcc_jit_block_as_object (gcc_jit_block@w{ }*block) + +Upcast from block to object. +@end deffn + +@geindex gcc_jit_block_get_function (C function) +@anchor{topics/functions c gcc_jit_block_get_function}@anchor{117} +@deffn {C Function} gcc_jit_function * gcc_jit_block_get_function (gcc_jit_block@w{ }*block) + +Which function is this block within? +@end deffn + +@node Statements,,Blocks,Creating and using functions +@anchor{topics/functions statements}@anchor{118} +@subsection Statements + + +@geindex gcc_jit_block_add_eval (C function) +@anchor{topics/functions c gcc_jit_block_add_eval}@anchor{d8} +@deffn {C Function} void gcc_jit_block_add_eval (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*rvalue) + +Add evaluation of an rvalue, discarding the result +(e.g. a function call that “returns” void). + +This is equivalent to this C code: + +@example +(void)expression; +@end example +@end deffn + +@geindex gcc_jit_block_add_assignment (C function) +@anchor{topics/functions c gcc_jit_block_add_assignment}@anchor{2a} +@deffn {C Function} void gcc_jit_block_add_assignment (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_lvalue@w{ }*lvalue, gcc_jit_rvalue@w{ }*rvalue) + +Add evaluation of an rvalue, assigning the result to the given +lvalue. + +This is roughly equivalent to this C code: + +@example +lvalue = rvalue; +@end example +@end deffn + +@geindex gcc_jit_block_add_assignment_op (C function) +@anchor{topics/functions c gcc_jit_block_add_assignment_op}@anchor{2e} +@deffn {C Function} void gcc_jit_block_add_assignment_op (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_lvalue@w{ }*lvalue, enum gcc_jit_binary_op@w{ }op, gcc_jit_rvalue@w{ }*rvalue) + +Add evaluation of an rvalue, using the result to modify an +lvalue. + +This is analogous to “+=” and friends: + +@example +lvalue += rvalue; +lvalue *= rvalue; +lvalue /= rvalue; +@end example + +etc. For example: + +@example +/* "i++" */ +gcc_jit_block_add_assignment_op ( + loop_body, NULL, + i, + GCC_JIT_BINARY_OP_PLUS, + gcc_jit_context_one (ctxt, int_type)); +@end example +@end deffn + +@geindex gcc_jit_block_add_comment (C function) +@anchor{topics/functions c gcc_jit_block_add_comment}@anchor{3d} +@deffn {C Function} void gcc_jit_block_add_comment (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, const char@w{ }*text) + +Add a no-op textual comment to the internal representation of the +code. It will be optimized away, but will be visible in the dumps +seen via @ref{66,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE} +and @ref{1c,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE}, +and thus may be of use when debugging how your project’s internal +representation gets converted to the libgccjit IR. + +The parameter @code{text} must be non-NULL. It is copied, so the input +buffer does not need to outlive the call. For example: + +@example +char buf[100]; +snprintf (buf, sizeof (buf), + "op%i: %s", + pc, opcode_names[op->op_opcode]); +gcc_jit_block_add_comment (block, loc, buf); +@end example +@end deffn + +@geindex gcc_jit_block_end_with_conditional (C function) +@anchor{topics/functions c gcc_jit_block_end_with_conditional}@anchor{2d} +@deffn {C Function} void gcc_jit_block_end_with_conditional (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*boolval, gcc_jit_block@w{ }*on_true, gcc_jit_block@w{ }*on_false) + +Terminate a block by adding evaluation of an rvalue, branching on the +result to the appropriate successor block. + +This is roughly equivalent to this C code: + +@example +if (boolval) + goto on_true; +else + goto on_false; +@end example + +block, boolval, on_true, and on_false must be non-NULL. +@end deffn + +@geindex gcc_jit_block_end_with_jump (C function) +@anchor{topics/functions c gcc_jit_block_end_with_jump}@anchor{119} +@deffn {C Function} void gcc_jit_block_end_with_jump (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_block@w{ }*target) + +Terminate a block by adding a jump to the given target block. + +This is roughly equivalent to this C code: + +@example +goto target; +@end example +@end deffn + +@geindex gcc_jit_block_end_with_return (C function) +@anchor{topics/functions c gcc_jit_block_end_with_return}@anchor{11a} +@deffn {C Function} void gcc_jit_block_end_with_return (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*rvalue) + +Terminate a block by adding evaluation of an rvalue, returning the value. + +This is roughly equivalent to this C code: + +@example +return expression; +@end example +@end deffn + +@geindex gcc_jit_block_end_with_void_return (C function) +@anchor{topics/functions c gcc_jit_block_end_with_void_return}@anchor{11b} +@deffn {C Function} void gcc_jit_block_end_with_void_return (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc) + +Terminate a block by adding a valueless return, for use within a function +with “void” return type. + +This is equivalent to this C code: + +@example +return; +@end example +@end deffn + +@geindex gcc_jit_block_end_with_switch (C function) +@anchor{topics/functions c gcc_jit_block_end_with_switch}@anchor{11c} +@deffn {C Function} void gcc_jit_block_end_with_switch (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, gcc_jit_rvalue@w{ }*expr, gcc_jit_block@w{ }*default_block, int@w{ }num_cases, gcc_jit_case@w{ }**cases) + +Terminate a block by adding evalation of an rvalue, then performing +a multiway branch. + +This is roughly equivalent to this C code: + +@example +switch (expr) + @{ + default: + goto default_block; + + case C0.min_value ... C0.max_value: + goto C0.dest_block; + + case C1.min_value ... C1.max_value: + goto C1.dest_block; + + ...etc... + + case C[N - 1].min_value ... C[N - 1].max_value: + goto C[N - 1].dest_block; +@} +@end example + +@code{block}, @code{expr}, @code{default_block} and @code{cases} must all be +non-NULL. + +@code{expr} must be of the same integer type as all of the @code{min_value} +and @code{max_value} within the cases. + +@code{num_cases} must be >= 0. + +The ranges of the cases must not overlap (or have duplicate +values). + +The API entrypoints relating to switch statements and cases: + +@quotation + + +@itemize * + +@item +@ref{11c,,gcc_jit_block_end_with_switch()} + +@item +@ref{11d,,gcc_jit_case_as_object()} + +@item +@ref{11e,,gcc_jit_context_new_case()} +@end itemize +@end quotation + +were added in @ref{11f,,LIBGCCJIT_ABI_3}; you can test for their presence +using + +@example +#ifdef LIBGCCJIT_HAVE_SWITCH_STATEMENTS +@end example + +@geindex gcc_jit_case (C type) + +@deffn {C Type} gcc_jit_case +@end deffn + +A @cite{gcc_jit_case} represents a case within a switch statement, and +is created within a particular @ref{8,,gcc_jit_context} using +@ref{11e,,gcc_jit_context_new_case()}. + +Each case expresses a multivalued range of integer values. You +can express single-valued cases by passing in the same value for +both @cite{min_value} and @cite{max_value}. + +@geindex gcc_jit_context_new_case (C function) +@anchor{topics/functions c gcc_jit_context_new_case}@anchor{11e} +@deffn {C Function} gcc_jit_case * gcc_jit_context_new_case (gcc_jit_context@w{ }*ctxt, gcc_jit_rvalue@w{ }*min_value, gcc_jit_rvalue@w{ }*max_value, gcc_jit_block@w{ }*dest_block) + +Create a new gcc_jit_case instance for use in a switch statement. +@cite{min_value} and @cite{max_value} must be constants of an integer type, +which must match that of the expression of the switch statement. + +@cite{dest_block} must be within the same function as the switch +statement. +@end deffn + +@geindex gcc_jit_case_as_object (C function) +@anchor{topics/functions c gcc_jit_case_as_object}@anchor{11d} +@deffn {C Function} gcc_jit_object * gcc_jit_case_as_object (gcc_jit_case@w{ }*case_) + +Upcast from a case to an object. +@end deffn + +Here’s an example of creating a switch statement: + +@quotation + +@example + +void +create_code (gcc_jit_context *ctxt, void *user_data) +@{ + /* Let's try to inject the equivalent of: + int + test_switch (int x) + @{ + switch (x) + @{ + case 0 ... 5: + return 3; + + case 25 ... 27: + return 4; + + case -42 ... -17: + return 83; + + case 40: + return 8; + + default: + return 10; + @} + @} + */ + gcc_jit_type *t_int = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + gcc_jit_type *return_type = t_int; + gcc_jit_param *x = + gcc_jit_context_new_param (ctxt, NULL, t_int, "x"); + gcc_jit_param *params[1] = @{x@}; + gcc_jit_function *func = + gcc_jit_context_new_function (ctxt, NULL, + GCC_JIT_FUNCTION_EXPORTED, + return_type, + "test_switch", + 1, params, 0); + + gcc_jit_block *b_initial = + gcc_jit_function_new_block (func, "initial"); + + gcc_jit_block *b_default = + gcc_jit_function_new_block (func, "default"); + gcc_jit_block *b_case_0_5 = + gcc_jit_function_new_block (func, "case_0_5"); + gcc_jit_block *b_case_25_27 = + gcc_jit_function_new_block (func, "case_25_27"); + gcc_jit_block *b_case_m42_m17 = + gcc_jit_function_new_block (func, "case_m42_m17"); + gcc_jit_block *b_case_40 = + gcc_jit_function_new_block (func, "case_40"); + + gcc_jit_case *cases[4] = @{ + gcc_jit_context_new_case ( + ctxt, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 0), + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 5), + b_case_0_5), + gcc_jit_context_new_case ( + ctxt, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 25), + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 27), + b_case_25_27), + gcc_jit_context_new_case ( + ctxt, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, -42), + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, -17), + b_case_m42_m17), + gcc_jit_context_new_case ( + ctxt, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 40), + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 40), + b_case_40) + @}; + gcc_jit_block_end_with_switch ( + b_initial, NULL, + gcc_jit_param_as_rvalue (x), + b_default, + 4, cases); + + gcc_jit_block_end_with_return ( + b_case_0_5, NULL, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 3)); + gcc_jit_block_end_with_return ( + b_case_25_27, NULL, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 4)); + gcc_jit_block_end_with_return ( + b_case_m42_m17, NULL, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 83)); + gcc_jit_block_end_with_return ( + b_case_40, NULL, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 8)); + gcc_jit_block_end_with_return ( + b_default, NULL, + gcc_jit_context_new_rvalue_from_int (ctxt, t_int, 10)); +@} + +@end example +@end quotation +@end deffn + +See also @ref{120,,gcc_jit_extended_asm} for entrypoints for adding inline +assembler statements to a function. + +@c Copyright (C) 2017-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Function pointers<2>,Source Locations,Creating and using functions,Topic Reference +@anchor{topics/function-pointers doc}@anchor{121}@anchor{topics/function-pointers function-pointers}@anchor{122} +@section Function pointers + + +You can generate calls that use a function pointer via +@ref{d9,,gcc_jit_context_new_call_through_ptr()}. + +To do requires a @ref{13,,gcc_jit_rvalue} of the correct function pointer type. + +Function pointers for a @ref{29,,gcc_jit_function} can be obtained +via @ref{dd,,gcc_jit_function_get_address()}. + +@geindex gcc_jit_function_get_address (C function) +@anchor{topics/function-pointers c gcc_jit_function_get_address}@anchor{dd} +@deffn {C Function} gcc_jit_rvalue * gcc_jit_function_get_address (gcc_jit_function@w{ }*fn, gcc_jit_location@w{ }*loc) + +Get the address of a function as an rvalue, of function pointer +type. + +This entrypoint was added in @ref{123,,LIBGCCJIT_ABI_9}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_function_get_address +@end example +@end deffn + +Alternatively, given an existing function, you can obtain a pointer +to it in @ref{13,,gcc_jit_rvalue} form using +@ref{b3,,gcc_jit_context_new_rvalue_from_ptr()}, using a function pointer +type obtained using @ref{97,,gcc_jit_context_new_function_ptr_type()}. + +Here’s an example of creating a function pointer type corresponding to C’s +@code{void (*) (int, int, int)}: + +@example +gcc_jit_type *void_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_VOID); +gcc_jit_type *int_type = + gcc_jit_context_get_type (ctxt, GCC_JIT_TYPE_INT); + +/* Build the function ptr type. */ +gcc_jit_type *param_types[3]; +param_types[0] = int_type; +param_types[1] = int_type; +param_types[2] = int_type; + +gcc_jit_type *fn_ptr_type = + gcc_jit_context_new_function_ptr_type (ctxt, NULL, + void_type, + 3, param_types, 0); +@end example + +@geindex gcc_jit_context_new_function_ptr_type (C function) +@anchor{topics/function-pointers c gcc_jit_context_new_function_ptr_type}@anchor{97} +@deffn {C Function} gcc_jit_type * gcc_jit_context_new_function_ptr_type (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, gcc_jit_type@w{ }*return_type, int@w{ }num_params, gcc_jit_type@w{ }**param_types, int@w{ }is_variadic) + +Generate a @ref{a,,gcc_jit_type} for a function pointer with the +given return type and parameters. + +Each of @cite{param_types} must be non-@cite{void}; @cite{return_type} may be @cite{void}. +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Source Locations,Compiling a context,Function pointers<2>,Topic Reference +@anchor{topics/locations doc}@anchor{124}@anchor{topics/locations source-locations}@anchor{125} +@section Source Locations + + +@geindex gcc_jit_location (C type) +@anchor{topics/locations c gcc_jit_location}@anchor{3b} +@deffn {C Type} gcc_jit_location + +A @cite{gcc_jit_location} encapsulates a source code location, so that +you can (optionally) associate locations in your language with +statements in the JIT-compiled code, allowing the debugger to +single-step through your language. + +@cite{gcc_jit_location} instances are optional: you can always pass NULL to +any API entrypoint accepting one. + +You can construct them using @ref{41,,gcc_jit_context_new_location()}. + +You need to enable @ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} on the +@ref{8,,gcc_jit_context} for these locations to actually be usable by +the debugger: + +@example +gcc_jit_context_set_bool_option ( + ctxt, + GCC_JIT_BOOL_OPTION_DEBUGINFO, + 1); +@end example +@end deffn + +@geindex gcc_jit_context_new_location (C function) +@anchor{topics/locations c gcc_jit_context_new_location}@anchor{41} +@deffn {C Function} gcc_jit_location * gcc_jit_context_new_location (gcc_jit_context@w{ }*ctxt, const char@w{ }*filename, int@w{ }line, int@w{ }column) + +Create a @cite{gcc_jit_location} instance representing the given source +location. + +The parameter @code{filename} must be non-NULL. The call takes a copy of +the underlying string, so it is valid to pass in a pointer to an +on-stack buffer. +@end deffn + +@menu +* Faking it:: + +@end menu + +@node Faking it,,,Source Locations +@anchor{topics/locations faking-it}@anchor{126} +@subsection Faking it + + +If you don’t have source code for your internal representation, but need +to debug, you can generate a C-like representation of the functions in +your context using @ref{5a,,gcc_jit_context_dump_to_file()}: + +@example +gcc_jit_context_dump_to_file (ctxt, "/tmp/something.c", + 1 /* update_locations */); +@end example + +This will dump C-like code to the given path. If the @cite{update_locations} +argument is true, this will also set up @cite{gcc_jit_location} information +throughout the context, pointing at the dump file as if it were a source +file, giving you @emph{something} you can step through in the debugger. + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Compiling a context,ABI and API compatibility,Source Locations,Topic Reference +@anchor{topics/compilation doc}@anchor{127}@anchor{topics/compilation compiling-a-context}@anchor{128} +@section Compiling a context + + +Once populated, a @ref{8,,gcc_jit_context *} can be compiled to +machine code, either in-memory via @ref{15,,gcc_jit_context_compile()} or +to disk via @ref{4a,,gcc_jit_context_compile_to_file()}. + +You can compile a context multiple times (using either form of +compilation), although any errors that occur on the context will +prevent any future compilation of that context. + +@menu +* In-memory compilation:: +* Ahead-of-time compilation:: + +@end menu + +@node In-memory compilation,Ahead-of-time compilation,,Compiling a context +@anchor{topics/compilation in-memory-compilation}@anchor{129} +@subsection In-memory compilation + + +@geindex gcc_jit_context_compile (C function) +@anchor{topics/compilation c gcc_jit_context_compile}@anchor{15} +@deffn {C Function} gcc_jit_result * gcc_jit_context_compile (gcc_jit_context@w{ }*ctxt) + +This calls into GCC and builds the code, returning a +@cite{gcc_jit_result *}. + +If the result is non-NULL, the caller becomes responsible for +calling @ref{39,,gcc_jit_result_release()} on it once they’re done +with it. +@end deffn + +@geindex gcc_jit_result (C type) +@anchor{topics/compilation c gcc_jit_result}@anchor{16} +@deffn {C Type} gcc_jit_result + +A @cite{gcc_jit_result} encapsulates the result of compiling a context +in-memory, and the lifetimes of any machine code functions or globals +that are within the result. +@end deffn + +@geindex gcc_jit_result_get_code (C function) +@anchor{topics/compilation c gcc_jit_result_get_code}@anchor{17} +@deffn {C Function} void * gcc_jit_result_get_code (gcc_jit_result@w{ }*result, const char@w{ }*funcname) + +Locate a given function within the built machine code. + +Functions are looked up by name. For this to succeed, a function +with a name matching @cite{funcname} must have been created on +@cite{result}’s context (or a parent context) via a call to +@ref{11,,gcc_jit_context_new_function()} with @cite{kind} +@ref{10a,,GCC_JIT_FUNCTION_EXPORTED}: + +@example +gcc_jit_context_new_function (ctxt, + any_location, /* or NULL */ + /* Required for func to be visible to + gcc_jit_result_get_code: */ + GCC_JIT_FUNCTION_EXPORTED, + any_return_type, + /* Must string-compare equal: */ + funcname, + /* etc */); +@end example + +If such a function is not found (or @cite{result} or @cite{funcname} are +@code{NULL}), an error message will be emitted on stderr and +@code{NULL} will be returned. + +If the function is found, the result will need to be cast to a +function pointer of the correct type before it can be called. + +Note that the resulting machine code becomes invalid after +@ref{39,,gcc_jit_result_release()} is called on the +@ref{16,,gcc_jit_result *}; attempting to call it after that may lead +to a segmentation fault. +@end deffn + +@geindex gcc_jit_result_get_global (C function) +@anchor{topics/compilation c gcc_jit_result_get_global}@anchor{f8} +@deffn {C Function} void * gcc_jit_result_get_global (gcc_jit_result@w{ }*result, const char@w{ }*name) + +Locate a given global within the built machine code. + +Globals are looked up by name. For this to succeed, a global +with a name matching @cite{name} must have been created on +@cite{result}’s context (or a parent context) via a call to +@ref{f5,,gcc_jit_context_new_global()} with @cite{kind} +@ref{f7,,GCC_JIT_GLOBAL_EXPORTED}. + +If the global is found, the result will need to be cast to a +pointer of the correct type before it can be called. + +This is a @emph{pointer} to the global, so e.g. for an @code{int} this is +an @code{int *}. + +For example, given an @code{int foo;} created this way: + +@example +gcc_jit_lvalue *exported_global = + gcc_jit_context_new_global (ctxt, + any_location, /* or NULL */ + GCC_JIT_GLOBAL_EXPORTED, + int_type, + "foo"); +@end example + +we can access it like this: + +@example +int *ptr_to_foo = + (int *)gcc_jit_result_get_global (result, "foo"); +@end example + +If such a global is not found (or @cite{result} or @cite{name} are +@code{NULL}), an error message will be emitted on stderr and +@code{NULL} will be returned. + +Note that the resulting address becomes invalid after +@ref{39,,gcc_jit_result_release()} is called on the +@ref{16,,gcc_jit_result *}; attempting to use it after that may lead +to a segmentation fault. +@end deffn + +@geindex gcc_jit_result_release (C function) +@anchor{topics/compilation c gcc_jit_result_release}@anchor{39} +@deffn {C Function} void gcc_jit_result_release (gcc_jit_result@w{ }*result) + +Once we’re done with the code, this unloads the built .so file. +This cleans up the result; after calling this, it’s no longer +valid to use the result, or any code or globals that were obtained +by calling @ref{17,,gcc_jit_result_get_code()} or +@ref{f8,,gcc_jit_result_get_global()} on it. +@end deffn + +@node Ahead-of-time compilation,,In-memory compilation,Compiling a context +@anchor{topics/compilation ahead-of-time-compilation}@anchor{12a} +@subsection Ahead-of-time compilation + + +Although libgccjit is primarily aimed at just-in-time compilation, it +can also be used for implementing more traditional ahead-of-time +compilers, via the @ref{4a,,gcc_jit_context_compile_to_file()} +API entrypoint. + +For linking in object files, use @ref{76,,gcc_jit_context_add_driver_option()}. + +@geindex gcc_jit_context_compile_to_file (C function) +@anchor{topics/compilation c gcc_jit_context_compile_to_file}@anchor{4a} +@deffn {C Function} void gcc_jit_context_compile_to_file (gcc_jit_context@w{ }*ctxt, enum gcc_jit_output_kind@w{ }output_kind, const char@w{ }*output_path) + +Compile the @ref{8,,gcc_jit_context *} to a file of the given +kind. +@end deffn + +@ref{4a,,gcc_jit_context_compile_to_file()} ignores the suffix of +@code{output_path}, and insteads uses the given +@code{enum gcc_jit_output_kind} to decide what to do. + +@cartouche +@quotation Note +This is different from the @code{gcc} program, which does make use of the +suffix of the output file when determining what to do. +@end quotation +@end cartouche + +@geindex gcc_jit_output_kind (C type) +@anchor{topics/compilation c gcc_jit_output_kind}@anchor{12b} +@deffn {C Type} enum gcc_jit_output_kind +@end deffn + +The available kinds of output are: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxx} +@headitem + +Output kind + +@tab + +Typical suffix + +@item + +@ref{12c,,GCC_JIT_OUTPUT_KIND_ASSEMBLER} + +@tab + +.s + +@item + +@ref{12d,,GCC_JIT_OUTPUT_KIND_OBJECT_FILE} + +@tab + +.o + +@item + +@ref{12e,,GCC_JIT_OUTPUT_KIND_DYNAMIC_LIBRARY} + +@tab + +.so or .dll + +@item + +@ref{12f,,GCC_JIT_OUTPUT_KIND_EXECUTABLE} + +@tab + +None, or .exe + +@end multitable + + +@geindex GCC_JIT_OUTPUT_KIND_ASSEMBLER (C macro) +@anchor{topics/compilation c GCC_JIT_OUTPUT_KIND_ASSEMBLER}@anchor{12c} +@deffn {C Macro} GCC_JIT_OUTPUT_KIND_ASSEMBLER + +Compile the context to an assembler file. +@end deffn + +@geindex GCC_JIT_OUTPUT_KIND_OBJECT_FILE (C macro) +@anchor{topics/compilation c GCC_JIT_OUTPUT_KIND_OBJECT_FILE}@anchor{12d} +@deffn {C Macro} GCC_JIT_OUTPUT_KIND_OBJECT_FILE + +Compile the context to an object file. +@end deffn + +@geindex GCC_JIT_OUTPUT_KIND_DYNAMIC_LIBRARY (C macro) +@anchor{topics/compilation c GCC_JIT_OUTPUT_KIND_DYNAMIC_LIBRARY}@anchor{12e} +@deffn {C Macro} GCC_JIT_OUTPUT_KIND_DYNAMIC_LIBRARY + +Compile the context to a dynamic library. +@end deffn + +@geindex GCC_JIT_OUTPUT_KIND_EXECUTABLE (C macro) +@anchor{topics/compilation c GCC_JIT_OUTPUT_KIND_EXECUTABLE}@anchor{12f} +@deffn {C Macro} GCC_JIT_OUTPUT_KIND_EXECUTABLE + +Compile the context to an executable. +@end deffn + +@c Copyright (C) 2015-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node ABI and API compatibility,Performance,Compiling a context,Topic Reference +@anchor{topics/compatibility doc}@anchor{130}@anchor{topics/compatibility abi-and-api-compatibility}@anchor{131} +@section ABI and API compatibility + + +The libgccjit developers strive for ABI and API backward-compatibility: +programs built against libgccjit.so stand a good chance of running +without recompilation against newer versions of libgccjit.so, and +ought to recompile without modification against newer versions of +libgccjit.h. + +@cartouche +@quotation Note +The libgccjit++.h C++ API is more experimental, and less +locked-down at this time. +@end quotation +@end cartouche + +API compatibility is achieved by extending the API rather than changing +it. For ABI compatiblity, we avoid bumping the SONAME, and instead use +symbol versioning to tag each symbol, so that a binary linked against +libgccjit.so is tagged according to the symbols that it uses. + +For example, @ref{74,,gcc_jit_context_add_command_line_option()} was added in +@code{LIBGCCJIT_ABI_1}. If a client program uses it, this can be detected +from metadata by using @code{objdump}: + +@example +$ objdump -p testsuite/jit/test-extra-options.c.exe | tail -n 8 + +Version References: + required from libgccjit.so.0: + 0x00824161 0x00 04 LIBGCCJIT_ABI_1 + 0x00824160 0x00 03 LIBGCCJIT_ABI_0 + required from libc.so.6: +@end example + +You can see the symbol tags provided by libgccjit.so using @code{objdump}: + +@example +$ objdump -p libgccjit.so | less +[...snip...] +Version definitions: +1 0x01 0x0ff81f20 libgccjit.so.0 +2 0x00 0x00824160 LIBGCCJIT_ABI_0 +3 0x00 0x00824161 LIBGCCJIT_ABI_1 + LIBGCCJIT_ABI_0 +[...snip...] +@end example + +@menu +* Programmatically checking version:: +* ABI symbol tags:: + +@end menu + +@node Programmatically checking version,ABI symbol tags,,ABI and API compatibility +@anchor{topics/compatibility programmatically-checking-version}@anchor{132} +@subsection Programmatically checking version + + +Client code can programmatically check libgccjit version using: + +@geindex gcc_jit_version_major (C function) +@anchor{topics/compatibility c gcc_jit_version_major}@anchor{133} +@deffn {C Function} int gcc_jit_version_major (void) + +Return libgccjit major version. This is analogous to __GNUC__ in C code. +@end deffn + +@geindex gcc_jit_version_minor (C function) +@anchor{topics/compatibility c gcc_jit_version_minor}@anchor{134} +@deffn {C Function} int gcc_jit_version_minor (void) + +Return libgccjit minor version. This is analogous to +__GNUC_MINOR__ in C code. +@end deffn + +@geindex gcc_jit_version_patchlevel (C function) +@anchor{topics/compatibility c gcc_jit_version_patchlevel}@anchor{135} +@deffn {C Function} int gcc_jit_version_patchlevel (void) + +Return libgccjit patchlevel version. This is analogous to +__GNUC_PATCHLEVEL__ in C code. +@end deffn + +@cartouche +@quotation Note +These entry points has been added with @code{LIBGCCJIT_ABI_13} +(see below). +@end quotation +@end cartouche + +@node ABI symbol tags,,Programmatically checking version,ABI and API compatibility +@anchor{topics/compatibility abi-symbol-tags}@anchor{136} +@subsection ABI symbol tags + + +The initial release of libgccjit (in gcc 5.1) did not use symbol versioning. + +Newer releases use the following tags. + +@menu +* LIBGCCJIT_ABI_0:: +* LIBGCCJIT_ABI_1:: +* LIBGCCJIT_ABI_2:: +* LIBGCCJIT_ABI_3:: +* LIBGCCJIT_ABI_4:: +* LIBGCCJIT_ABI_5:: +* LIBGCCJIT_ABI_6:: +* LIBGCCJIT_ABI_7:: +* LIBGCCJIT_ABI_8:: +* LIBGCCJIT_ABI_9:: +* LIBGCCJIT_ABI_10:: +* LIBGCCJIT_ABI_11:: +* LIBGCCJIT_ABI_12:: +* LIBGCCJIT_ABI_13:: +* LIBGCCJIT_ABI_14:: +* LIBGCCJIT_ABI_15:: +* LIBGCCJIT_ABI_16:: +* LIBGCCJIT_ABI_17:: +* LIBGCCJIT_ABI_18:: +* LIBGCCJIT_ABI_19:: +* LIBGCCJIT_ABI_20:: +* LIBGCCJIT_ABI_21:: +* LIBGCCJIT_ABI_22:: +* LIBGCCJIT_ABI_23:: +* LIBGCCJIT_ABI_24:: + +@end menu + +@node LIBGCCJIT_ABI_0,LIBGCCJIT_ABI_1,,ABI symbol tags +@anchor{topics/compatibility id1}@anchor{137}@anchor{topics/compatibility libgccjit-abi-0}@anchor{138} +@subsubsection @code{LIBGCCJIT_ABI_0} + + +All entrypoints in the initial release of libgccjit are tagged with +@code{LIBGCCJIT_ABI_0}, to signify the transition to symbol versioning. + +Binaries built against older copies of @code{libgccjit.so} should +continue to work, with this being handled transparently by the linker +(see this post@footnote{https://gcc.gnu.org/ml/gcc-patches/2015-06/msg02126.html}) + +@node LIBGCCJIT_ABI_1,LIBGCCJIT_ABI_2,LIBGCCJIT_ABI_0,ABI symbol tags +@anchor{topics/compatibility id2}@anchor{139}@anchor{topics/compatibility libgccjit-abi-1}@anchor{75} +@subsubsection @code{LIBGCCJIT_ABI_1} + + +@code{LIBGCCJIT_ABI_1} covers the addition of +@ref{74,,gcc_jit_context_add_command_line_option()} + +@node LIBGCCJIT_ABI_2,LIBGCCJIT_ABI_3,LIBGCCJIT_ABI_1,ABI symbol tags +@anchor{topics/compatibility id3}@anchor{13a}@anchor{topics/compatibility libgccjit-abi-2}@anchor{6c} +@subsubsection @code{LIBGCCJIT_ABI_2} + + +@code{LIBGCCJIT_ABI_2} covers the addition of +@ref{6b,,gcc_jit_context_set_bool_allow_unreachable_blocks()} + +@node LIBGCCJIT_ABI_3,LIBGCCJIT_ABI_4,LIBGCCJIT_ABI_2,ABI symbol tags +@anchor{topics/compatibility id4}@anchor{13b}@anchor{topics/compatibility libgccjit-abi-3}@anchor{11f} +@subsubsection @code{LIBGCCJIT_ABI_3} + + +@code{LIBGCCJIT_ABI_3} covers the addition of switch statements via API +entrypoints: + +@quotation + + +@itemize * + +@item +@ref{11c,,gcc_jit_block_end_with_switch()} + +@item +@ref{11d,,gcc_jit_case_as_object()} + +@item +@ref{11e,,gcc_jit_context_new_case()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_4,LIBGCCJIT_ABI_5,LIBGCCJIT_ABI_3,ABI symbol tags +@anchor{topics/compatibility id5}@anchor{13c}@anchor{topics/compatibility libgccjit-abi-4}@anchor{13d} +@subsubsection @code{LIBGCCJIT_ABI_4} + + +@code{LIBGCCJIT_ABI_4} covers the addition of timers via API +entrypoints: + +@quotation + + +@itemize * + +@item +@ref{13e,,gcc_jit_context_get_timer()} + +@item +@ref{13f,,gcc_jit_context_set_timer()} + +@item +@ref{140,,gcc_jit_timer_new()} + +@item +@ref{141,,gcc_jit_timer_release()} + +@item +@ref{142,,gcc_jit_timer_push()} + +@item +@ref{143,,gcc_jit_timer_pop()} + +@item +@ref{144,,gcc_jit_timer_print()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_5,LIBGCCJIT_ABI_6,LIBGCCJIT_ABI_4,ABI symbol tags +@anchor{topics/compatibility id6}@anchor{145}@anchor{topics/compatibility libgccjit-abi-5}@anchor{6e} +@subsubsection @code{LIBGCCJIT_ABI_5} + + +@code{LIBGCCJIT_ABI_5} covers the addition of +@ref{6d,,gcc_jit_context_set_bool_use_external_driver()} + +@node LIBGCCJIT_ABI_6,LIBGCCJIT_ABI_7,LIBGCCJIT_ABI_5,ABI symbol tags +@anchor{topics/compatibility id7}@anchor{146}@anchor{topics/compatibility libgccjit-abi-6}@anchor{db} +@subsubsection @code{LIBGCCJIT_ABI_6} + + +@code{LIBGCCJIT_ABI_6} covers the addition of +@ref{da,,gcc_jit_rvalue_set_bool_require_tail_call()} + +@node LIBGCCJIT_ABI_7,LIBGCCJIT_ABI_8,LIBGCCJIT_ABI_6,ABI symbol tags +@anchor{topics/compatibility id8}@anchor{147}@anchor{topics/compatibility libgccjit-abi-7}@anchor{85} +@subsubsection @code{LIBGCCJIT_ABI_7} + + +@code{LIBGCCJIT_ABI_7} covers the addition of +@ref{84,,gcc_jit_type_get_aligned()} + +@node LIBGCCJIT_ABI_8,LIBGCCJIT_ABI_9,LIBGCCJIT_ABI_7,ABI symbol tags +@anchor{topics/compatibility id9}@anchor{148}@anchor{topics/compatibility libgccjit-abi-8}@anchor{88} +@subsubsection @code{LIBGCCJIT_ABI_8} + + +@code{LIBGCCJIT_ABI_8} covers the addition of +@ref{87,,gcc_jit_type_get_vector()} + +@node LIBGCCJIT_ABI_9,LIBGCCJIT_ABI_10,LIBGCCJIT_ABI_8,ABI symbol tags +@anchor{topics/compatibility id10}@anchor{149}@anchor{topics/compatibility libgccjit-abi-9}@anchor{123} +@subsubsection @code{LIBGCCJIT_ABI_9} + + +@code{LIBGCCJIT_ABI_9} covers the addition of +@ref{dd,,gcc_jit_function_get_address()} + +@node LIBGCCJIT_ABI_10,LIBGCCJIT_ABI_11,LIBGCCJIT_ABI_9,ABI symbol tags +@anchor{topics/compatibility id11}@anchor{14a}@anchor{topics/compatibility libgccjit-abi-10}@anchor{bd} +@subsubsection @code{LIBGCCJIT_ABI_10} + + +@code{LIBGCCJIT_ABI_10} covers the addition of +@ref{89,,gcc_jit_context_new_rvalue_from_vector()} + +@node LIBGCCJIT_ABI_11,LIBGCCJIT_ABI_12,LIBGCCJIT_ABI_10,ABI symbol tags +@anchor{topics/compatibility id12}@anchor{14b}@anchor{topics/compatibility libgccjit-abi-11}@anchor{77} +@subsubsection @code{LIBGCCJIT_ABI_11} + + +@code{LIBGCCJIT_ABI_11} covers the addition of +@ref{76,,gcc_jit_context_add_driver_option()} + +@node LIBGCCJIT_ABI_12,LIBGCCJIT_ABI_13,LIBGCCJIT_ABI_11,ABI symbol tags +@anchor{topics/compatibility id13}@anchor{14c}@anchor{topics/compatibility libgccjit-abi-12}@anchor{8f} +@subsubsection @code{LIBGCCJIT_ABI_12} + + +@code{LIBGCCJIT_ABI_12} covers the addition of +@ref{8e,,gcc_jit_context_new_bitfield()} + +@node LIBGCCJIT_ABI_13,LIBGCCJIT_ABI_14,LIBGCCJIT_ABI_12,ABI symbol tags +@anchor{topics/compatibility id14}@anchor{14d}@anchor{topics/compatibility libgccjit-abi-13}@anchor{14e} +@subsubsection @code{LIBGCCJIT_ABI_13} + + +@code{LIBGCCJIT_ABI_13} covers the addition of version functions via API +entrypoints: + +@quotation + + +@itemize * + +@item +@ref{133,,gcc_jit_version_major()} + +@item +@ref{134,,gcc_jit_version_minor()} + +@item +@ref{135,,gcc_jit_version_patchlevel()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_14,LIBGCCJIT_ABI_15,LIBGCCJIT_ABI_13,ABI symbol tags +@anchor{topics/compatibility id15}@anchor{14f}@anchor{topics/compatibility libgccjit-abi-14}@anchor{fc} +@subsubsection @code{LIBGCCJIT_ABI_14} + + +@code{LIBGCCJIT_ABI_14} covers the addition of +@ref{fb,,gcc_jit_global_set_initializer()} + +@node LIBGCCJIT_ABI_15,LIBGCCJIT_ABI_16,LIBGCCJIT_ABI_14,ABI symbol tags +@anchor{topics/compatibility id16}@anchor{150}@anchor{topics/compatibility libgccjit-abi-15}@anchor{151} +@subsubsection @code{LIBGCCJIT_ABI_15} + + +@code{LIBGCCJIT_ABI_15} covers the addition of API entrypoints for directly +embedding assembler instructions: + +@quotation + + +@itemize * + +@item +@ref{152,,gcc_jit_block_add_extended_asm()} + +@item +@ref{153,,gcc_jit_block_end_with_extended_asm_goto()} + +@item +@ref{154,,gcc_jit_extended_asm_as_object()} + +@item +@ref{155,,gcc_jit_extended_asm_set_volatile_flag()} + +@item +@ref{156,,gcc_jit_extended_asm_set_inline_flag()} + +@item +@ref{157,,gcc_jit_extended_asm_add_output_operand()} + +@item +@ref{158,,gcc_jit_extended_asm_add_input_operand()} + +@item +@ref{159,,gcc_jit_extended_asm_add_clobber()} + +@item +@ref{15a,,gcc_jit_context_add_top_level_asm()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_16,LIBGCCJIT_ABI_17,LIBGCCJIT_ABI_15,ABI symbol tags +@anchor{topics/compatibility id17}@anchor{15b}@anchor{topics/compatibility libgccjit-abi-16}@anchor{a8} +@subsubsection @code{LIBGCCJIT_ABI_16} + + +@code{LIBGCCJIT_ABI_16} covers the addition of reflection functions via API +entrypoints: + +@quotation + + +@itemize * + +@item +@ref{112,,gcc_jit_function_get_return_type()} + +@item +@ref{111,,gcc_jit_function_get_param_count()} + +@item +@ref{99,,gcc_jit_type_dyncast_array()} + +@item +@ref{9a,,gcc_jit_type_is_bool()} + +@item +@ref{9f,,gcc_jit_type_is_integral()} + +@item +@ref{a0,,gcc_jit_type_is_pointer()} + +@item +@ref{a2,,gcc_jit_type_is_struct()} + +@item +@ref{a1,,gcc_jit_type_dyncast_vector()} + +@item +@ref{a5,,gcc_jit_type_unqualified()} + +@item +@ref{9b,,gcc_jit_type_dyncast_function_ptr_type()} + +@item +@ref{9c,,gcc_jit_function_type_get_return_type()} + +@item +@ref{9d,,gcc_jit_function_type_get_param_count()} + +@item +@ref{9e,,gcc_jit_function_type_get_param_type()} + +@item +@ref{a3,,gcc_jit_vector_type_get_num_units()} + +@item +@ref{a4,,gcc_jit_vector_type_get_element_type()} + +@item +@ref{a6,,gcc_jit_struct_get_field()} + +@item +@ref{a7,,gcc_jit_struct_get_field_count()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_17,LIBGCCJIT_ABI_18,LIBGCCJIT_ABI_16,ABI symbol tags +@anchor{topics/compatibility id18}@anchor{15c}@anchor{topics/compatibility libgccjit-abi-17}@anchor{ed} +@subsubsection @code{LIBGCCJIT_ABI_17} + + +@code{LIBGCCJIT_ABI_17} covers the addition of an API entrypoint to set the +thread-local storage model of a variable: + +@quotation + + +@itemize * + +@item +@ref{e6,,gcc_jit_lvalue_set_tls_model()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_18,LIBGCCJIT_ABI_19,LIBGCCJIT_ABI_17,ABI symbol tags +@anchor{topics/compatibility id19}@anchor{15d}@anchor{topics/compatibility libgccjit-abi-18}@anchor{ef} +@subsubsection @code{LIBGCCJIT_ABI_18} + + +@code{LIBGCCJIT_ABI_18} covers the addition of an API entrypoint to set the link +section of a variable: + +@quotation + + +@itemize * + +@item +@ref{ee,,gcc_jit_lvalue_set_link_section()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_19,LIBGCCJIT_ABI_20,LIBGCCJIT_ABI_18,ABI symbol tags +@anchor{topics/compatibility id20}@anchor{15e}@anchor{topics/compatibility libgccjit-abi-19}@anchor{b8} +@subsubsection @code{LIBGCCJIT_ABI_19} + + +@code{LIBGCCJIT_ABI_19} covers the addition of API entrypoints to set the initial value +of a global with an rvalue and to use constructors: + +@quotation + + +@itemize * + +@item +@ref{b9,,gcc_jit_context_new_array_constructor()} + +@item +@ref{ba,,gcc_jit_context_new_struct_constructor()} + +@item +@ref{bb,,gcc_jit_context_new_union_constructor()} + +@item +@ref{b7,,gcc_jit_global_set_initializer_rvalue()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_20,LIBGCCJIT_ABI_21,LIBGCCJIT_ABI_19,ABI symbol tags +@anchor{topics/compatibility id21}@anchor{15f}@anchor{topics/compatibility libgccjit-abi-20}@anchor{ab} +@subsubsection @code{LIBGCCJIT_ABI_20} + + +@code{LIBGCCJIT_ABI_20} covers the addition of sized integer types, including +128-bit integers and helper functions for types: + +@quotation + + +@itemize * + +@item +@ref{aa,,gcc_jit_compatible_types()} + +@item +@ref{ac,,gcc_jit_type_get_size()} + +@item +@code{GCC_JIT_TYPE_UINT8_T} + +@item +@code{GCC_JIT_TYPE_UINT16_T} + +@item +@code{GCC_JIT_TYPE_UINT32_T} + +@item +@code{GCC_JIT_TYPE_UINT64_T} + +@item +@code{GCC_JIT_TYPE_UINT128_T} + +@item +@code{GCC_JIT_TYPE_INT8_T} + +@item +@code{GCC_JIT_TYPE_INT16_T} + +@item +@code{GCC_JIT_TYPE_INT32_T} + +@item +@code{GCC_JIT_TYPE_INT64_T} + +@item +@code{GCC_JIT_TYPE_INT128_T} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_21,LIBGCCJIT_ABI_22,LIBGCCJIT_ABI_20,ABI symbol tags +@anchor{topics/compatibility id22}@anchor{160}@anchor{topics/compatibility libgccjit-abi-21}@anchor{e1} +@subsubsection @code{LIBGCCJIT_ABI_21} + + +@code{LIBGCCJIT_ABI_21} covers the addition of an API entrypoint to bitcast a +value from one type to another: + +@quotation + + +@itemize * + +@item +@ref{e0,,gcc_jit_context_new_bitcast()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_22,LIBGCCJIT_ABI_23,LIBGCCJIT_ABI_21,ABI symbol tags +@anchor{topics/compatibility id23}@anchor{161}@anchor{topics/compatibility libgccjit-abi-22}@anchor{f0} +@subsubsection @code{LIBGCCJIT_ABI_22} + + +@code{LIBGCCJIT_ABI_22} covers the addition of an API entrypoint to set the +register name of a variable: + +@quotation + + +@itemize * + +@item +@code{gcc_jit_lvalue_set_register_name()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_23,LIBGCCJIT_ABI_24,LIBGCCJIT_ABI_22,ABI symbol tags +@anchor{topics/compatibility id24}@anchor{162}@anchor{topics/compatibility libgccjit-abi-23}@anchor{70} +@subsubsection @code{LIBGCCJIT_ABI_23} + + +@code{LIBGCCJIT_ABI_23} covers the addition of an API entrypoint to hide stderr +logs: + +@quotation + + +@itemize * + +@item +@ref{6f,,gcc_jit_context_set_bool_print_errors_to_stderr()} +@end itemize +@end quotation + +@node LIBGCCJIT_ABI_24,,LIBGCCJIT_ABI_23,ABI symbol tags +@anchor{topics/compatibility id25}@anchor{163}@anchor{topics/compatibility libgccjit-abi-24}@anchor{f2} +@subsubsection @code{LIBGCCJIT_ABI_24} + + +@code{LIBGCCJIT_ABI_24} covers the addition of functions to get and set the +alignment of a variable: + +@quotation + + +@itemize * + +@item +@ref{f1,,gcc_jit_lvalue_set_alignment()} + +@item +@ref{f3,,gcc_jit_lvalue_get_alignment()} +@end itemize +@end quotation + +@c Copyright (C) 2015-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Performance,Using Assembly Language with libgccjit,ABI and API compatibility,Topic Reference +@anchor{topics/performance doc}@anchor{164}@anchor{topics/performance performance}@anchor{165} +@section Performance + + +@menu +* The timing API:: + +@end menu + +@node The timing API,,,Performance +@anchor{topics/performance the-timing-api}@anchor{166} +@subsection The timing API + + +As of GCC 6, libgccjit exposes a timing API, for printing reports on +how long was spent in different parts of code. + +You can create a @ref{167,,gcc_jit_timer} instance, which will +measure time spent since its creation. The timer maintains a stack +of “timer items”: as control flow moves through your code, you can push +and pop named items relating to your code onto the stack, and the timer +will account the time spent accordingly. + +You can also asssociate a timer with a @ref{8,,gcc_jit_context}, in +which case the time spent inside compilation will be subdivided. + +For example, the following code uses a timer, recording client items +“create_code”, “compile”, and “running code”: + +@example +/* Create a timer. */ +gcc_jit_timer *timer = gcc_jit_timer_new (); +if (!timer) + @{ + error ("gcc_jit_timer_new failed"); + return -1; + @} + +/* Let's repeatedly compile and run some code, accumulating it + all into the timer. */ +for (int i = 0; i < num_iterations; i++) + @{ + /* Create a context and associate it with the timer. */ + gcc_jit_context *ctxt = gcc_jit_context_acquire (); + if (!ctxt) + @{ + error ("gcc_jit_context_acquire failed"); + return -1; + @} + gcc_jit_context_set_timer (ctxt, timer); + + /* Populate the context, timing it as client item "create_code". */ + gcc_jit_timer_push (timer, "create_code"); + create_code (ctxt); + gcc_jit_timer_pop (timer, "create_code"); + + /* Compile the context, timing it as client item "compile". */ + gcc_jit_timer_push (timer, "compile"); + result = gcc_jit_context_compile (ctxt); + gcc_jit_timer_pop (timer, "compile"); + + /* Run the generated code, timing it as client item "running code". */ + gcc_jit_timer_push (timer, "running code"); + run_the_code (ctxt, result); + gcc_jit_timer_pop (timer, "running code"); + + /* Clean up. */ + gcc_jit_context_release (ctxt); + gcc_jit_result_release (result); +@} + +/* Print the accumulated timings. */ +gcc_jit_timer_print (timer, stderr); +gcc_jit_timer_release (timer); +@end example + +giving output like this, showing the internal GCC items at the top, then +client items, then the total: + +@example +Execution times (seconds) +GCC items: + phase setup : 0.29 (14%) usr 0.00 ( 0%) sys 0.32 ( 5%) wall 10661 kB (50%) ggc + phase parsing : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 653 kB ( 3%) ggc + phase finalize : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + dump files : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc + callgraph construction : 0.02 ( 1%) usr 0.01 ( 6%) sys 0.01 ( 0%) wall 242 kB ( 1%) ggc + callgraph optimization : 0.03 ( 2%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 142 kB ( 1%) ggc + trivially dead code : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + df scan insns : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 9 kB ( 0%) ggc + df live regs : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 0 kB ( 0%) ggc + inline parameters : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 82 kB ( 0%) ggc + tree CFG cleanup : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + tree PHI insertion : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.02 ( 0%) wall 64 kB ( 0%) ggc + tree SSA other : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.01 ( 0%) wall 18 kB ( 0%) ggc + expand : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 398 kB ( 2%) ggc + jump : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + loop init : 0.01 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 67 kB ( 0%) ggc + integrated RA : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 2468 kB (12%) ggc + thread pro- & epilogue : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 162 kB ( 1%) ggc + final : 0.01 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 216 kB ( 1%) ggc + rest of compilation : 1.37 (69%) usr 0.00 ( 0%) sys 1.13 (18%) wall 1391 kB ( 6%) ggc + assemble JIT code : 0.01 ( 1%) usr 0.00 ( 0%) sys 4.04 (66%) wall 0 kB ( 0%) ggc + load JIT result : 0.02 ( 1%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + JIT client code : 0.00 ( 0%) usr 0.01 ( 6%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc +Client items: + create_code : 0.00 ( 0%) usr 0.01 ( 6%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + compile : 0.36 (18%) usr 0.15 (83%) sys 0.86 (14%) wall 14939 kB (70%) ggc + running code : 0.00 ( 0%) usr 0.00 ( 0%) sys 0.00 ( 0%) wall 0 kB ( 0%) ggc + TOTAL : 2.00 0.18 6.12 21444 kB +@end example + +The exact format is intended to be human-readable, and is subject to change. + +@geindex LIBGCCJIT_HAVE_TIMING_API (C macro) +@anchor{topics/performance c LIBGCCJIT_HAVE_TIMING_API}@anchor{168} +@deffn {C Macro} LIBGCCJIT_HAVE_TIMING_API + +The timer API was added to libgccjit in GCC 6. +This macro is only defined in versions of libgccjit.h which have the +timer API, and so can be used to guard code that may need to compile +against earlier releases: + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +gcc_jit_timer *t = gcc_jit_timer_new (); +gcc_jit_context_set_timer (ctxt, t); +#endif +@end example +@end deffn + +@geindex gcc_jit_timer (C type) +@anchor{topics/performance c gcc_jit_timer}@anchor{167} +@deffn {C Type} gcc_jit_timer +@end deffn + +@geindex gcc_jit_timer_new (C function) +@anchor{topics/performance c gcc_jit_timer_new}@anchor{140} +@deffn {C Function} gcc_jit_timer * gcc_jit_timer_new (void) + +Create a @ref{167,,gcc_jit_timer} instance, and start timing: + +@example +gcc_jit_timer *t = gcc_jit_timer_new (); +@end example + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_timer_release (C function) +@anchor{topics/performance c gcc_jit_timer_release}@anchor{141} +@deffn {C Function} void gcc_jit_timer_release (gcc_jit_timer@w{ }*timer) + +Release a @ref{167,,gcc_jit_timer} instance: + +@example +gcc_jit_timer_release (t); +@end example + +This should be called exactly once on a timer. + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_context_set_timer (C function) +@anchor{topics/performance c gcc_jit_context_set_timer}@anchor{13f} +@deffn {C Function} void gcc_jit_context_set_timer (gcc_jit_context@w{ }*ctxt, gcc_jit_timer@w{ }*timer) + +Associate a @ref{167,,gcc_jit_timer} instance with a context: + +@example +gcc_jit_context_set_timer (ctxt, t); +@end example + +A timer instance can be shared between multiple +@ref{8,,gcc_jit_context} instances. + +Timers have no locking, so if you have a multithreaded program, you +must provide your own locks if more than one thread could be working +with the same timer via timer-associated contexts. + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_context_get_timer (C function) +@anchor{topics/performance c gcc_jit_context_get_timer}@anchor{13e} +@deffn {C Function} gcc_jit_timer *gcc_jit_context_get_timer (gcc_jit_context@w{ }*ctxt) + +Get the timer associated with a context (if any). + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_timer_push (C function) +@anchor{topics/performance c gcc_jit_timer_push}@anchor{142} +@deffn {C Function} void gcc_jit_timer_push (gcc_jit_timer@w{ }*timer, const char@w{ }*item_name) + +Push the given item onto the timer’s stack: + +@example +gcc_jit_timer_push (t, "running code"); +run_the_code (ctxt, result); +gcc_jit_timer_pop (t, "running code"); +@end example + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_timer_pop (C function) +@anchor{topics/performance c gcc_jit_timer_pop}@anchor{143} +@deffn {C Function} void gcc_jit_timer_pop (gcc_jit_timer@w{ }*timer, const char@w{ }*item_name) + +Pop the top item from the timer’s stack. + +If “item_name” is provided, it must match that of the top item. +Alternatively, @code{NULL} can be passed in, to suppress checking. + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@geindex gcc_jit_timer_print (C function) +@anchor{topics/performance c gcc_jit_timer_print}@anchor{144} +@deffn {C Function} void gcc_jit_timer_print (gcc_jit_timer@w{ }*timer, FILE@w{ }*f_out) + +Print timing information to the given stream about activity since +the timer was started. + +This API entrypoint was added in @ref{13d,,LIBGCCJIT_ABI_4}; you can test +for its presence using + +@example +#ifdef LIBGCCJIT_HAVE_TIMING_API +@end example +@end deffn + +@c Copyright (C) 2020-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Using Assembly Language with libgccjit,,Performance,Topic Reference +@anchor{topics/asm doc}@anchor{169}@anchor{topics/asm using-assembly-language-with-libgccjit}@anchor{16a} +@section Using Assembly Language with libgccjit + + +libgccjit has some support for directly embedding assembler instructions. +This is based on GCC’s support for inline @code{asm} in C code, and the +following assumes a familiarity with that functionality. See +How to Use Inline Assembly Language in C Code@footnote{https://gcc.gnu.org/onlinedocs/gcc/Using-Assembly-Language-with-C.html} +in GCC’s documentation, the “Extended Asm” section in particular. + +These entrypoints were added in @ref{151,,LIBGCCJIT_ABI_15}; you can test +for their presence using + +@quotation + +@example +#ifdef LIBGCCJIT_HAVE_ASM_STATEMENTS +@end example +@end quotation + +@menu +* Adding assembler instructions within a function:: +* Adding top-level assembler statements:: + +@end menu + +@node Adding assembler instructions within a function,Adding top-level assembler statements,,Using Assembly Language with libgccjit +@anchor{topics/asm adding-assembler-instructions-within-a-function}@anchor{16b} +@subsection Adding assembler instructions within a function + + +@geindex gcc_jit_extended_asm (C type) +@anchor{topics/asm c gcc_jit_extended_asm}@anchor{120} +@deffn {C Type} gcc_jit_extended_asm + +A @cite{gcc_jit_extended_asm} represents an extended @code{asm} statement: a +series of low-level instructions inside a function that convert inputs +to outputs. + +To avoid having an API entrypoint with a very large number of +parameters, an extended @code{asm} statement is made in stages: +an initial call to create the @ref{120,,gcc_jit_extended_asm}, +followed by calls to add operands and set other properties of the +statement. + +There are two API entrypoints for creating a @ref{120,,gcc_jit_extended_asm}: + + +@itemize * + +@item +@ref{152,,gcc_jit_block_add_extended_asm()} for an @code{asm} statement with +no control flow, and + +@item +@ref{153,,gcc_jit_block_end_with_extended_asm_goto()} for an @code{asm goto}. +@end itemize + +For example, to create the equivalent of: + +@example + asm ("mov %1, %0\n\t" + "add $1, %0" + : "=r" (dst) + : "r" (src)); +@end example + +the following API calls could be used: + +@example + gcc_jit_extended_asm *ext_asm + = gcc_jit_block_add_extended_asm (block, NULL, + "mov %1, %0\n\t" + "add $1, %0"); + gcc_jit_extended_asm_add_output_operand (ext_asm, NULL, "=r", dst); + gcc_jit_extended_asm_add_input_operand (ext_asm, NULL, "r", + gcc_jit_lvalue_as_rvalue (src)); +@end example + +@cartouche +@quotation Warning +When considering the numbering of operands within an +extended @code{asm} statement (e.g. the @code{%0} and @code{%1} +above), the equivalent to the C syntax is followed i.e. all +output operands, then all input operands, regardless of +what order the calls to +@ref{157,,gcc_jit_extended_asm_add_output_operand()} and +@ref{158,,gcc_jit_extended_asm_add_input_operand()} were made in. +@end quotation +@end cartouche + +As in the C syntax, operands can be given symbolic names to avoid having +to number them. For example, to create the equivalent of: + +@example + asm ("bsfl %[aMask], %[aIndex]" + : [aIndex] "=r" (Index) + : [aMask] "r" (Mask) + : "cc"); +@end example + +the following API calls could be used: + +@example + gcc_jit_extended_asm *ext_asm + = gcc_jit_block_add_extended_asm (block, NULL, + "bsfl %[aMask], %[aIndex]"); + gcc_jit_extended_asm_add_output_operand (ext_asm, "aIndex", "=r", index); + gcc_jit_extended_asm_add_input_operand (ext_asm, "aMask", "r", + gcc_jit_param_as_rvalue (mask)); + gcc_jit_extended_asm_add_clobber (ext_asm, "cc"); +@end example +@end deffn + +@geindex gcc_jit_block_add_extended_asm (C function) +@anchor{topics/asm c gcc_jit_block_add_extended_asm}@anchor{152} +@deffn {C Function} gcc_jit_extended_asm * gcc_jit_block_add_extended_asm (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, const char@w{ }*asm_template) + +Create a @ref{120,,gcc_jit_extended_asm} for an extended @code{asm} statement +with no control flow (i.e. without the @code{goto} qualifier). + +The parameter @code{asm_template} corresponds to the @cite{AssemblerTemplate} +within C’s extended @code{asm} syntax. It must be non-NULL. The call takes +a copy of the underlying string, so it is valid to pass in a pointer to +an on-stack buffer. +@end deffn + +@geindex gcc_jit_block_end_with_extended_asm_goto (C function) +@anchor{topics/asm c gcc_jit_block_end_with_extended_asm_goto}@anchor{153} +@deffn {C Function} gcc_jit_extended_asm * gcc_jit_block_end_with_extended_asm_goto (gcc_jit_block@w{ }*block, gcc_jit_location@w{ }*loc, const char@w{ }*asm_template, int@w{ }num_goto_blocks, gcc_jit_block@w{ }**goto_blocks, gcc_jit_block@w{ }*fallthrough_block) + +Create a @ref{120,,gcc_jit_extended_asm} for an extended @code{asm} statement +that may perform jumps, and use it to terminate the given block. +This is equivalent to the @code{goto} qualifier in C’s extended @code{asm} +syntax. + +For example, to create the equivalent of: + +@example + asm goto ("btl %1, %0\n\t" + "jc %l[carry]" + : // No outputs + : "r" (p1), "r" (p2) + : "cc" + : carry); +@end example + +the following API calls could be used: + +@example + const char *asm_template = + (use_name + ? /* Label referred to by name: "%l[carry]". */ + ("btl %1, %0\n\t" + "jc %l[carry]") + : /* Label referred to numerically: "%l2". */ + ("btl %1, %0\n\t" + "jc %l2")); + + gcc_jit_extended_asm *ext_asm + = gcc_jit_block_end_with_extended_asm_goto (b_start, NULL, + asm_template, + 1, &b_carry, + b_fallthru); + gcc_jit_extended_asm_add_input_operand (ext_asm, NULL, "r", + gcc_jit_param_as_rvalue (p1)); + gcc_jit_extended_asm_add_input_operand (ext_asm, NULL, "r", + gcc_jit_param_as_rvalue (p2)); + gcc_jit_extended_asm_add_clobber (ext_asm, "cc"); +@end example + +here referencing a @ref{28,,gcc_jit_block} named “carry”. + +@code{num_goto_blocks} must be >= 0. + +@code{goto_blocks} must be non-NULL. This corresponds to the @code{GotoLabels} +parameter within C’s extended @code{asm} syntax. The block names can be +referenced within the assembler template. + +@code{fallthrough_block} can be NULL. If non-NULL, it specifies the block +to fall through to after the statement. + +@cartouche +@quotation Note +This is needed since each @ref{28,,gcc_jit_block} must have a +single exit point, as a basic block: you can’t jump from the +middle of a block. A “goto” is implicitly added after the +asm to handle the fallthrough case, which is equivalent to what +would have happened in the C case. +@end quotation +@end cartouche +@end deffn + +@geindex gcc_jit_extended_asm_set_volatile_flag (C function) +@anchor{topics/asm c gcc_jit_extended_asm_set_volatile_flag}@anchor{155} +@deffn {C Function} void gcc_jit_extended_asm_set_volatile_flag (gcc_jit_extended_asm@w{ }*ext_asm, int@w{ }flag) + +Set whether the @ref{120,,gcc_jit_extended_asm} has side-effects, equivalent to the +volatile@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Volatile} +qualifier in C’s extended asm syntax. + +For example, to create the equivalent of: + +@example +asm volatile ("rdtsc\n\t" // Returns the time in EDX:EAX. + "shl $32, %%rdx\n\t" // Shift the upper bits left. + "or %%rdx, %0" // 'Or' in the lower bits. + : "=a" (msr) + : + : "rdx"); +@end example + +the following API calls could be used: + +@example + gcc_jit_extended_asm *ext_asm + = gcc_jit_block_add_extended_asm + (block, NULL, + "rdtsc\n\t" /* Returns the time in EDX:EAX. */ + "shl $32, %%rdx\n\t" /* Shift the upper bits left. */ + "or %%rdx, %0"); /* 'Or' in the lower bits. */ + gcc_jit_extended_asm_set_volatile_flag (ext_asm, 1); + gcc_jit_extended_asm_add_output_operand (ext_asm, NULL, "=a", msr); + gcc_jit_extended_asm_add_clobber (ext_asm, "rdx"); +@end example + +where the @ref{120,,gcc_jit_extended_asm} is flagged as volatile. +@end deffn + +@geindex gcc_jit_extended_asm_set_inline_flag (C function) +@anchor{topics/asm c gcc_jit_extended_asm_set_inline_flag}@anchor{156} +@deffn {C Function} void gcc_jit_extended_asm_set_inline_flag (gcc_jit_extended_asm@w{ }*ext_asm, int@w{ }flag) + +Set the equivalent of the +inline@footnote{https://gcc.gnu.org/onlinedocs/gcc/Size-of-an-asm.html#Size-of-an-asm} +qualifier in C’s extended @code{asm} syntax. +@end deffn + +@geindex gcc_jit_extended_asm_add_output_operand (C function) +@anchor{topics/asm c gcc_jit_extended_asm_add_output_operand}@anchor{157} +@deffn {C Function} void gcc_jit_extended_asm_add_output_operand (gcc_jit_extended_asm@w{ }*ext_asm, const char@w{ }*asm_symbolic_name, const char@w{ }*constraint, gcc_jit_lvalue@w{ }*dest) + +Add an output operand to the extended @code{asm} statement. See the +Output Operands@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#OutputOperands} +section of the documentation of the C syntax. + +@code{asm_symbolic_name} corresponds to the @code{asmSymbolicName} component of C’s +extended @code{asm} syntax. It can be NULL. If non-NULL it specifies the +symbolic name for the operand. + +@code{constraint} corresponds to the @code{constraint} component of C’s extended +@code{asm} syntax. It must be non-NULL. + +@code{dest} corresponds to the @code{cvariablename} component of C’s extended +@code{asm} syntax. It must be non-NULL. + +@example +// Example with a NULL symbolic name, the equivalent of: +// : "=r" (dst) +gcc_jit_extended_asm_add_output_operand (ext_asm, NULL, "=r", dst); + +// Example with a symbolic name ("aIndex"), the equivalent of: +// : [aIndex] "=r" (index) +gcc_jit_extended_asm_add_output_operand (ext_asm, "aIndex", "=r", index); +@end example + +This function can’t be called on an @code{asm goto} as such instructions can’t +have outputs; see the +Goto Labels@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#GotoLabels} +section of GCC’s “Extended Asm” documentation. +@end deffn + +@geindex gcc_jit_extended_asm_add_input_operand (C function) +@anchor{topics/asm c gcc_jit_extended_asm_add_input_operand}@anchor{158} +@deffn {C Function} void gcc_jit_extended_asm_add_input_operand (gcc_jit_extended_asm@w{ }*ext_asm, const char@w{ }*asm_symbolic_name, const char@w{ }*constraint, gcc_jit_rvalue@w{ }*src) + +Add an input operand to the extended @code{asm} statement. See the +Input Operands@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#InputOperands} +section of the documentation of the C syntax. + +@code{asm_symbolic_name} corresponds to the @code{asmSymbolicName} component of C’s +extended @code{asm} syntax. It can be NULL. If non-NULL it specifies the +symbolic name for the operand. + +@code{constraint} corresponds to the @code{constraint} component of C’s extended +@code{asm} syntax. It must be non-NULL. + +@code{src} corresponds to the @code{cexpression} component of C’s extended +@code{asm} syntax. It must be non-NULL. + +@example +// Example with a NULL symbolic name, the equivalent of: +// : "r" (src) +gcc_jit_extended_asm_add_input_operand (ext_asm, NULL, "r", + gcc_jit_lvalue_as_rvalue (src)); + +// Example with a symbolic name ("aMask"), the equivalent of: +// : [aMask] "r" (Mask) +gcc_jit_extended_asm_add_input_operand (ext_asm, "aMask", "r", + gcc_jit_lvalue_as_rvalue (mask)); +@end example +@end deffn + +@geindex gcc_jit_extended_asm_add_clobber (C function) +@anchor{topics/asm c gcc_jit_extended_asm_add_clobber}@anchor{159} +@deffn {C Function} void gcc_jit_extended_asm_add_clobber (gcc_jit_extended_asm@w{ }*ext_asm, const char@w{ }*victim) + +Add @cite{victim} to the list of registers clobbered by the extended @code{asm} +statement. It must be non-NULL. See the +Clobbers and Scratch Registers@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Clobbers-and-Scratch-Registers#} +section of the documentation of the C syntax. + +Statements with multiple clobbers will require multiple calls, one per +clobber. + +For example: + +@example +gcc_jit_extended_asm_add_clobber (ext_asm, "r0"); +gcc_jit_extended_asm_add_clobber (ext_asm, "cc"); +gcc_jit_extended_asm_add_clobber (ext_asm, "memory"); +@end example +@end deffn + +A @ref{120,,gcc_jit_extended_asm} is a @ref{e,,gcc_jit_object} “owned” by +the block’s context. The following upcast is available: + +@geindex gcc_jit_extended_asm_as_object (C function) +@anchor{topics/asm c gcc_jit_extended_asm_as_object}@anchor{154} +@deffn {C Function} gcc_jit_object * gcc_jit_extended_asm_as_object (gcc_jit_extended_asm@w{ }*ext_asm) + +Upcast from extended @code{asm} to object. +@end deffn + +@node Adding top-level assembler statements,,Adding assembler instructions within a function,Using Assembly Language with libgccjit +@anchor{topics/asm adding-top-level-assembler-statements}@anchor{16c} +@subsection Adding top-level assembler statements + + +In addition to creating extended @code{asm} instructions within a function, +there is support for creating “top-level” assembler statements, outside +of any function. + +@geindex gcc_jit_context_add_top_level_asm (C function) +@anchor{topics/asm c gcc_jit_context_add_top_level_asm}@anchor{15a} +@deffn {C Function} void gcc_jit_context_add_top_level_asm (gcc_jit_context@w{ }*ctxt, gcc_jit_location@w{ }*loc, const char@w{ }*asm_stmts) + +Create a set of top-level asm statements, analogous to those created +by GCC’s “basic” @code{asm} syntax in C at file scope. + +For example, to create the equivalent of: + +@example + asm ("\t.pushsection .text\n" + "\t.globl add_asm\n" + "\t.type add_asm, @@function\n" + "add_asm:\n" + "\tmovq %rdi, %rax\n" + "\tadd %rsi, %rax\n" + "\tret\n" + "\t.popsection\n"); +@end example + +the following API calls could be used: + +@example + gcc_jit_context_add_top_level_asm (ctxt, NULL, + "\t.pushsection .text\n" + "\t.globl add_asm\n" + "\t.type add_asm, @@function\n" + "add_asm:\n" + "\tmovq %rdi, %rax\n" + "\tadd %rsi, %rax\n" + "\tret\n" + "\t# some asm here\n" + "\t.popsection\n"); +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node C++ bindings for libgccjit,Internals,Topic Reference,Top +@anchor{cp/index doc}@anchor{16d}@anchor{cp/index c-bindings-for-libgccjit}@anchor{16e} +@chapter C++ bindings for libgccjit + + +This document describes the C++ bindings to +libgccjit@footnote{https://gcc.gnu.org/wiki/JIT}, an API for embedding GCC +inside programs and libraries. + +The C++ bindings consist of a single header file @code{libgccjit++.h}. + +This is a collection of “thin” wrapper classes around the C API. +Everything is an inline function, implemented in terms of the C API, +so there is nothing extra to link against. + +Contents: + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Tutorial: Tutorial<2>. +* Topic Reference: Topic Reference<2>. + +@end menu + +@node Tutorial<2>,Topic Reference<2>,,C++ bindings for libgccjit +@anchor{cp/intro/index doc}@anchor{16f}@anchor{cp/intro/index tutorial}@anchor{170} +@section Tutorial + + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Tutorial part 1; “Hello world”: Tutorial part 1 “Hello world”<2>. +* Tutorial part 2; Creating a trivial machine code function: Tutorial part 2 Creating a trivial machine code function<2>. +* Tutorial part 3; Loops and variables: Tutorial part 3 Loops and variables<2>. +* Tutorial part 4; Adding JIT-compilation to a toy interpreter: Tutorial part 4 Adding JIT-compilation to a toy interpreter<2>. + +@end menu + +@node Tutorial part 1 “Hello world”<2>,Tutorial part 2 Creating a trivial machine code function<2>,,Tutorial<2> +@anchor{cp/intro/tutorial01 doc}@anchor{171}@anchor{cp/intro/tutorial01 tutorial-part-1-hello-world}@anchor{172} +@subsection Tutorial part 1: “Hello world” + + +Before we look at the details of the API, let’s look at building and +running programs that use the library. + +Here’s a toy “hello world” program that uses the library’s C++ API to +synthesize a call to @cite{printf} and uses it to write a message to stdout. + +Don’t worry about the content of the program for now; we’ll cover +the details in later parts of this tutorial. + +@quotation + +@example +/* Smoketest example for libgccjit.so C++ API + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +static void +create_code (gccjit::context ctxt) +@{ + /* Let's try to inject the equivalent of this C code: + void + greet (const char *name) + @{ + printf ("hello %s\n", name); + @} + */ + gccjit::type void_type = ctxt.get_type (GCC_JIT_TYPE_VOID); + gccjit::type const_char_ptr_type = + ctxt.get_type (GCC_JIT_TYPE_CONST_CHAR_PTR); + gccjit::param param_name = + ctxt.new_param (const_char_ptr_type, "name"); + std::vector func_params; + func_params.push_back (param_name); + gccjit::function func = + ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + void_type, + "greet", + func_params, 0); + + gccjit::param param_format = + ctxt.new_param (const_char_ptr_type, "format"); + std::vector printf_params; + printf_params.push_back (param_format); + gccjit::function printf_func = + ctxt.new_function (GCC_JIT_FUNCTION_IMPORTED, + ctxt.get_type (GCC_JIT_TYPE_INT), + "printf", + printf_params, 1); + + gccjit::block block = func.new_block (); + block.add_eval (ctxt.new_call (printf_func, + ctxt.new_rvalue ("hello %s\n"), + param_name)); + block.end_with_return (); +@} + +int +main (int argc, char **argv) +@{ + gccjit::context ctxt; + gcc_jit_result *result; + + /* Get a "context" object for working with the library. */ + ctxt = gccjit::context::acquire (); + + /* Set some options on the context. + Turn this on to see the code being generated, in assembler form. */ + ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + result = ctxt.compile (); + if (!result) + @{ + fprintf (stderr, "NULL result"); + exit (1); + @} + + ctxt.release (); + + /* Extract the generated code from "result". */ + typedef void (*fn_type) (const char *); + fn_type greet = + (fn_type)gcc_jit_result_get_code (result, "greet"); + if (!greet) + @{ + fprintf (stderr, "NULL greet"); + exit (1); + @} + + /* Now call the generated function: */ + greet ("world"); + fflush (stdout); + + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Copy the above to @cite{tut01-hello-world.cc}. + +Assuming you have the jit library installed, build the test program +using: + +@example +$ gcc \ + tut01-hello-world.cc \ + -o tut01-hello-world \ + -lgccjit +@end example + +You should then be able to run the built program: + +@example +$ ./tut01-hello-world +hello world +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 2 Creating a trivial machine code function<2>,Tutorial part 3 Loops and variables<2>,Tutorial part 1 “Hello world”<2>,Tutorial<2> +@anchor{cp/intro/tutorial02 doc}@anchor{173}@anchor{cp/intro/tutorial02 tutorial-part-2-creating-a-trivial-machine-code-function}@anchor{174} +@subsection Tutorial part 2: Creating a trivial machine code function + + +Consider this C function: + +@example +int square (int i) +@{ + return i * i; +@} +@end example + +How can we construct this at run-time using libgccjit’s C++ API? + +First we need to include the relevant header: + +@example +#include +@end example + +All state associated with compilation is associated with a +@ref{175,,gccjit;;context}, which is a thin C++ wrapper around the C API’s +@ref{8,,gcc_jit_context *}. + +Create one using @ref{176,,gccjit;;context;;acquire()}: + +@example +gccjit::context ctxt; +ctxt = gccjit::context::acquire (); +@end example + +The JIT library has a system of types. It is statically-typed: every +expression is of a specific type, fixed at compile-time. In our example, +all of the expressions are of the C @cite{int} type, so let’s obtain this from +the context, as a @ref{177,,gccjit;;type}, using +@ref{178,,gccjit;;context;;get_type()}: + +@example +gccjit::type int_type = ctxt.get_type (GCC_JIT_TYPE_INT); +@end example + +@ref{177,,gccjit;;type} is an example of a “contextual” object: every +entity in the API is associated with a @ref{175,,gccjit;;context}. + +Memory management is easy: all such “contextual” objects are automatically +cleaned up for you when the context is released, using +@ref{179,,gccjit;;context;;release()}: + +@example +ctxt.release (); +@end example + +so you don’t need to manually track and cleanup all objects, just the +contexts. + +All of the C++ classes in the API are thin wrappers around pointers to +types in the C API. + +The C++ class hierarchy within the @code{gccjit} namespace looks like this: + +@example ++- object + +- location + +- type + +- struct + +- field + +- function + +- block + +- rvalue + +- lvalue + +- param +@end example + +One thing you can do with a @ref{17a,,gccjit;;object} is +to ask it for a human-readable description as a @code{std::string}, using +@ref{17b,,gccjit;;object;;get_debug_string()}: + +@example +printf ("obj: %s\n", obj.get_debug_string ().c_str ()); +@end example + +giving this text on stdout: + +@example +obj: int +@end example + +This is invaluable when debugging. + +Let’s create the function. To do so, we first need to construct +its single parameter, specifying its type and giving it a name, +using @ref{17c,,gccjit;;context;;new_param()}: + +@example +gccjit::param param_i = ctxt.new_param (int_type, "i"); +@end example + +and we can then make a vector of all of the params of the function, +in this case just one: + +@example +std::vector params; +params.push_back (param_i); +@end example + +Now we can create the function, using +@code{gccjit::context::new_function()}: + +@example +gccjit::function func = + ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + int_type, + "square", + params, + 0); +@end example + +To define the code within the function, we must create basic blocks +containing statements. + +Every basic block contains a list of statements, eventually terminated +by a statement that either returns, or jumps to another basic block. + +Our function has no control-flow, so we just need one basic block: + +@example +gccjit::block block = func.new_block (); +@end example + +Our basic block is relatively simple: it immediately terminates by +returning the value of an expression. + +We can build the expression using @ref{17d,,gccjit;;context;;new_binary_op()}: + +@example +gccjit::rvalue expr = + ctxt.new_binary_op ( + GCC_JIT_BINARY_OP_MULT, int_type, + param_i, param_i); +@end example + +A @ref{17e,,gccjit;;rvalue} is another example of a +@ref{17a,,gccjit;;object} subclass. As before, we can print it with +@ref{17b,,gccjit;;object;;get_debug_string()}. + +@example +printf ("expr: %s\n", expr.get_debug_string ().c_str ()); +@end example + +giving this output: + +@example +expr: i * i +@end example + +Note that @ref{17e,,gccjit;;rvalue} provides numerous overloaded operators +which can be used to dramatically reduce the amount of typing needed. +We can build the above binary operation more directly with this one-liner: + +@example +gccjit::rvalue expr = param_i * param_i; +@end example + +Creating the expression in itself doesn’t do anything; we have to add +this expression to a statement within the block. In this case, we use it +to build a return statement, which terminates the basic block: + +@example +block.end_with_return (expr); +@end example + +OK, we’ve populated the context. We can now compile it using +@ref{17f,,gccjit;;context;;compile()}: + +@example +gcc_jit_result *result; +result = ctxt.compile (); +@end example + +and get a @ref{16,,gcc_jit_result *}. + +We can now use @ref{17,,gcc_jit_result_get_code()} to look up a specific +machine code routine within the result, in this case, the function we +created above. + +@example +void *fn_ptr = gcc_jit_result_get_code (result, "square"); +if (!fn_ptr) + @{ + fprintf (stderr, "NULL fn_ptr"); + goto error; + @} +@end example + +We can now cast the pointer to an appropriate function pointer type, and +then call it: + +@example +typedef int (*fn_type) (int); +fn_type square = (fn_type)fn_ptr; +printf ("result: %d", square (5)); +@end example + +@example +result: 25 +@end example + +@menu +* Options: Options<3>. +* Full example: Full example<3>. + +@end menu + +@node Options<3>,Full example<3>,,Tutorial part 2 Creating a trivial machine code function<2> +@anchor{cp/intro/tutorial02 options}@anchor{180} +@subsubsection Options + + +To get more information on what’s going on, you can set debugging flags +on the context using @ref{181,,gccjit;;context;;set_bool_option()}. + +@c (I'm deliberately not mentioning +@c :c:macro:`GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE` here since I think +@c it's probably more of use to implementors than to users) + +Setting @ref{1c,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE} will dump a +C-like representation to stderr when you compile (GCC’s “GIMPLE” +representation): + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, 1); +result = ctxt.compile (); +@end example + +@example +square (signed int i) +@{ + signed int D.260; + + entry: + D.260 = i * i; + return D.260; +@} +@end example + +We can see the generated machine code in assembler form (on stderr) by +setting @ref{1d,,GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE} on the context +before compiling: + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, 1); +result = ctxt.compile (); +@end example + +@example + .file "fake.c" + .text + .globl square + .type square, @@function +square: +.LFB6: + .cfi_startproc + pushq %rbp + .cfi_def_cfa_offset 16 + .cfi_offset 6, -16 + movq %rsp, %rbp + .cfi_def_cfa_register 6 + movl %edi, -4(%rbp) +.L14: + movl -4(%rbp), %eax + imull -4(%rbp), %eax + popq %rbp + .cfi_def_cfa 7, 8 + ret + .cfi_endproc +.LFE6: + .size square, .-square + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-0.5.1920c315ff984892399893b380305ab36e07b455.fc20)" + .section .note.GNU-stack,"",@@progbits +@end example + +By default, no optimizations are performed, the equivalent of GCC’s +@cite{-O0} option. We can turn things up to e.g. @cite{-O3} by calling +@ref{182,,gccjit;;context;;set_int_option()} with +@ref{1f,,GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL}: + +@example +ctxt.set_int_option (GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 3); +@end example + +@example + .file "fake.c" + .text + .p2align 4,,15 + .globl square + .type square, @@function +square: +.LFB7: + .cfi_startproc +.L16: + movl %edi, %eax + imull %edi, %eax + ret + .cfi_endproc +.LFE7: + .size square, .-square + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-0.5.1920c315ff984892399893b380305ab36e07b455.fc20)" + .section .note.GNU-stack,"",@@progbits +@end example + +Naturally this has only a small effect on such a trivial function. + +@node Full example<3>,,Options<3>,Tutorial part 2 Creating a trivial machine code function<2> +@anchor{cp/intro/tutorial02 full-example}@anchor{183} +@subsubsection Full example + + +Here’s what the above looks like as a complete program: + +@quotation + +@example +/* Usage example for libgccjit.so's C++ API + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +void +create_code (gccjit::context ctxt) +@{ + /* Let's try to inject the equivalent of this C code: + + int square (int i) + @{ + return i * i; + @} + */ + gccjit::type int_type = ctxt.get_type (GCC_JIT_TYPE_INT); + gccjit::param param_i = ctxt.new_param (int_type, "i"); + std::vector params; + params.push_back (param_i); + gccjit::function func = ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + int_type, + "square", + params, 0); + + gccjit::block block = func.new_block (); + + gccjit::rvalue expr = + ctxt.new_binary_op (GCC_JIT_BINARY_OP_MULT, int_type, + param_i, param_i); + + block.end_with_return (expr); +@} + +int +main (int argc, char **argv) +@{ + /* Get a "context" object for working with the library. */ + gccjit::context ctxt = gccjit::context::acquire (); + + /* Set some options on the context. + Turn this on to see the code being generated, in assembler form. */ + ctxt.set_bool_option ( + GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + gcc_jit_result *result = ctxt.compile (); + + /* We're done with the context; we can release it: */ + ctxt.release (); + + if (!result) + @{ + fprintf (stderr, "NULL result"); + return 1; + @} + + /* Extract the generated code from "result". */ + void *fn_ptr = gcc_jit_result_get_code (result, "square"); + if (!fn_ptr) + @{ + fprintf (stderr, "NULL fn_ptr"); + gcc_jit_result_release (result); + return 1; + @} + + typedef int (*fn_type) (int); + fn_type square = (fn_type)fn_ptr; + printf ("result: %d\n", square (5)); + + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Building and running it: + +@example +$ gcc \ + tut02-square.cc \ + -o tut02-square \ + -lgccjit + +# Run the built program: +$ ./tut02-square +result: 25 +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 3 Loops and variables<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2>,Tutorial part 2 Creating a trivial machine code function<2>,Tutorial<2> +@anchor{cp/intro/tutorial03 doc}@anchor{184}@anchor{cp/intro/tutorial03 tutorial-part-3-loops-and-variables}@anchor{185} +@subsection Tutorial part 3: Loops and variables + + +Consider this C function: + +@quotation + +@example +int loop_test (int n) +@{ + int sum = 0; + for (int i = 0; i < n; i++) + sum += i * i; + return sum; +@} +@end example +@end quotation + +This example demonstrates some more features of libgccjit, with local +variables and a loop. + +To break this down into libgccjit terms, it’s usually easier to reword +the @cite{for} loop as a @cite{while} loop, giving: + +@quotation + +@example +int loop_test (int n) +@{ + int sum = 0; + int i = 0; + while (i < n) + @{ + sum += i * i; + i++; + @} + return sum; +@} +@end example +@end quotation + +Here’s what the final control flow graph will look like: + +@quotation + + +@float Figure + +@image{libgccjit-figures/sum-of-squares,,,image of a control flow graph,png} + +@end float + +@end quotation + +As before, we include the libgccjit++ header and make a +@ref{175,,gccjit;;context}. + +@example +#include + +void test (void) +@{ + gccjit::context ctxt; + ctxt = gccjit::context::acquire (); +@end example + +The function works with the C @cite{int} type. + +In the previous tutorial we acquired this via + +@example +gccjit::type the_type = ctxt.get_type (ctxt, GCC_JIT_TYPE_INT); +@end example + +though we could equally well make it work on, say, @cite{double}: + +@example +gccjit::type the_type = ctxt.get_type (ctxt, GCC_JIT_TYPE_DOUBLE); +@end example + +For integer types we can use @code{gccjit::context::get_int_type} +to directly bind a specific type: + +@example +gccjit::type the_type = ctxt.get_int_type (); +@end example + +Let’s build the function: + +@example +gcc_jit_param n = ctxt.new_param (the_type, "n"); +std::vector params; +params.push_back (n); +gccjit::function func = + ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + return_type, + "loop_test", + params, 0); +@end example + +@menu +* Expressions; lvalues and rvalues: Expressions lvalues and rvalues<2>. +* Control flow: Control flow<2>. +* Visualizing the control flow graph: Visualizing the control flow graph<2>. +* Full example: Full example<4>. + +@end menu + +@node Expressions lvalues and rvalues<2>,Control flow<2>,,Tutorial part 3 Loops and variables<2> +@anchor{cp/intro/tutorial03 expressions-lvalues-and-rvalues}@anchor{186} +@subsubsection Expressions: lvalues and rvalues + + +The base class of expression is the @ref{17e,,gccjit;;rvalue}, +representing an expression that can be on the @emph{right}-hand side of +an assignment: a value that can be computed somehow, and assigned +@emph{to} a storage area (such as a variable). It has a specific +@ref{177,,gccjit;;type}. + +Anothe important class is @ref{187,,gccjit;;lvalue}. +A @ref{187,,gccjit;;lvalue}. is something that can of the @emph{left}-hand +side of an assignment: a storage area (such as a variable). + +In other words, every assignment can be thought of as: + +@example +LVALUE = RVALUE; +@end example + +Note that @ref{187,,gccjit;;lvalue} is a subclass of +@ref{17e,,gccjit;;rvalue}, where in an assignment of the form: + +@example +LVALUE_A = LVALUE_B; +@end example + +the @cite{LVALUE_B} implies reading the current value of that storage +area, assigning it into the @cite{LVALUE_A}. + +So far the only expressions we’ve seen are from the previous tutorial: + + +@enumerate + +@item +the multiplication @cite{i * i}: +@end enumerate + +@quotation + +@example +gccjit::rvalue expr = + ctxt.new_binary_op ( + GCC_JIT_BINARY_OP_MULT, int_type, + param_i, param_i); + +/* Alternatively, using operator-overloading: */ +gccjit::rvalue expr = param_i * param_i; +@end example + +which is a @ref{17e,,gccjit;;rvalue}, and +@end quotation + + +@enumerate 2 + +@item +the various function parameters: @cite{param_i} and @cite{param_n}, instances of +@ref{188,,gccjit;;param}, which is a subclass of @ref{187,,gccjit;;lvalue} +(and, in turn, of @ref{17e,,gccjit;;rvalue}): +we can both read from and write to function parameters within the +body of a function. +@end enumerate + +Our new example has a new kind of expression: we have two local +variables. We create them by calling +@ref{189,,gccjit;;function;;new_local()}, supplying a type and a name: + +@example +/* Build locals: */ +gccjit::lvalue i = func.new_local (the_type, "i"); +gccjit::lvalue sum = func.new_local (the_type, "sum"); +@end example + +These are instances of @ref{187,,gccjit;;lvalue} - they can be read from +and written to. + +Note that there is no precanned way to create @emph{and} initialize a variable +like in C: + +@example +int i = 0; +@end example + +Instead, having added the local to the function, we have to separately add +an assignment of @cite{0} to @cite{local_i} at the beginning of the function. + +@node Control flow<2>,Visualizing the control flow graph<2>,Expressions lvalues and rvalues<2>,Tutorial part 3 Loops and variables<2> +@anchor{cp/intro/tutorial03 control-flow}@anchor{18a} +@subsubsection Control flow + + +This function has a loop, so we need to build some basic blocks to +handle the control flow. In this case, we need 4 blocks: + + +@enumerate + +@item +before the loop (initializing the locals) + +@item +the conditional at the top of the loop (comparing @cite{i < n}) + +@item +the body of the loop + +@item +after the loop terminates (@cite{return sum}) +@end enumerate + +so we create these as @ref{18b,,gccjit;;block} instances within the +@ref{18c,,gccjit;;function}: + +@example +gccjit::block b_initial = func.new_block ("initial"); +gccjit::block b_loop_cond = func.new_block ("loop_cond"); +gccjit::block b_loop_body = func.new_block ("loop_body"); +gccjit::block b_after_loop = func.new_block ("after_loop"); +@end example + +We now populate each block with statements. + +The entry block @cite{b_initial} consists of initializations followed by a jump +to the conditional. We assign @cite{0} to @cite{i} and to @cite{sum}, using +@ref{18d,,gccjit;;block;;add_assignment()} to add +an assignment statement, and using @ref{18e,,gccjit;;context;;zero()} to get +the constant value @cite{0} for the relevant type for the right-hand side of +the assignment: + +@example +/* sum = 0; */ +b_initial.add_assignment (sum, ctxt.zero (the_type)); + +/* i = 0; */ +b_initial.add_assignment (i, ctxt.zero (the_type)); +@end example + +We can then terminate the entry block by jumping to the conditional: + +@example +b_initial.end_with_jump (b_loop_cond); +@end example + +The conditional block is equivalent to the line @cite{while (i < n)} from our +C example. It contains a single statement: a conditional, which jumps to +one of two destination blocks depending on a boolean +@ref{17e,,gccjit;;rvalue}, in this case the comparison of @cite{i} and @cite{n}. + +We could build the comparison using @ref{18f,,gccjit;;context;;new_comparison()}: + +@example +gccjit::rvalue guard = + ctxt.new_comparison (GCC_JIT_COMPARISON_GE, + i, n); +@end example + +and can then use this to add @cite{b_loop_cond}’s sole statement, via +@ref{190,,gccjit;;block;;end_with_conditional()}: + +@example +b_loop_cond.end_with_conditional (guard, + b_after_loop, // on_true + b_loop_body); // on_false +@end example + +However @ref{17e,,gccjit;;rvalue} has overloaded operators for this, so we +express the conditional as + +@example +gccjit::rvalue guard = (i >= n); +@end example + +and hence we can write the block more concisely as: + +@example +b_loop_cond.end_with_conditional ( + i >= n, + b_after_loop, // on_true + b_loop_body); // on_false +@end example + +Next, we populate the body of the loop. + +The C statement @cite{sum += i * i;} is an assignment operation, where an +lvalue is modified “in-place”. We use +@ref{191,,gccjit;;block;;add_assignment_op()} to handle these operations: + +@example +/* sum += i * i */ +b_loop_body.add_assignment_op (sum, + GCC_JIT_BINARY_OP_PLUS, + i * i); +@end example + +The @cite{i++} can be thought of as @cite{i += 1}, and can thus be handled in +a similar way. We use @ref{2f,,gcc_jit_context_one()} to get the constant +value @cite{1} (for the relevant type) for the right-hand side +of the assignment. + +@example +/* i++ */ +b_loop_body.add_assignment_op (i, + GCC_JIT_BINARY_OP_PLUS, + ctxt.one (the_type)); +@end example + +@cartouche +@quotation Note +For numeric constants other than 0 or 1, we could use +@ref{192,,gccjit;;context;;new_rvalue()}, which has overloads +for both @code{int} and @code{double}. +@end quotation +@end cartouche + +The loop body completes by jumping back to the conditional: + +@example +b_loop_body.end_with_jump (b_loop_cond); +@end example + +Finally, we populate the @cite{b_after_loop} block, reached when the loop +conditional is false. We want to generate the equivalent of: + +@example +return sum; +@end example + +so the block is just one statement: + +@example +/* return sum */ +b_after_loop.end_with_return (sum); +@end example + +@cartouche +@quotation Note +You can intermingle block creation with statement creation, +but given that the terminator statements generally include references +to other blocks, I find it’s clearer to create all the blocks, +@emph{then} all the statements. +@end quotation +@end cartouche + +We’ve finished populating the function. As before, we can now compile it +to machine code: + +@example +gcc_jit_result *result; +result = ctxt.compile (); + +ctxt.release (); + +if (!result) + @{ + fprintf (stderr, "NULL result"); + return 1; + @} + +typedef int (*loop_test_fn_type) (int); +loop_test_fn_type loop_test = + (loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test"); +if (!loop_test) + @{ + fprintf (stderr, "NULL loop_test"); + gcc_jit_result_release (result); + return 1; + @} +printf ("result: %d", loop_test (10)); +@end example + +@example +result: 285 +@end example + +@node Visualizing the control flow graph<2>,Full example<4>,Control flow<2>,Tutorial part 3 Loops and variables<2> +@anchor{cp/intro/tutorial03 visualizing-the-control-flow-graph}@anchor{193} +@subsubsection Visualizing the control flow graph + + +You can see the control flow graph of a function using +@ref{194,,gccjit;;function;;dump_to_dot()}: + +@example +func.dump_to_dot ("/tmp/sum-of-squares.dot"); +@end example + +giving a .dot file in GraphViz format. + +You can convert this to an image using @cite{dot}: + +@example +$ dot -Tpng /tmp/sum-of-squares.dot -o /tmp/sum-of-squares.png +@end example + +or use a viewer (my preferred one is xdot.py; see +@indicateurl{https://github.com/jrfonseca/xdot.py}; on Fedora you can +install it with @cite{yum install python-xdot}): + +@quotation + + +@float Figure + +@image{libgccjit-figures/sum-of-squares,,,image of a control flow graph,png} + +@end float + +@end quotation + +@node Full example<4>,,Visualizing the control flow graph<2>,Tutorial part 3 Loops and variables<2> +@anchor{cp/intro/tutorial03 full-example}@anchor{195} +@subsubsection Full example + + +@quotation + +@example +/* Usage example for libgccjit.so's C++ API + Copyright (C) 2014-2022 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 3, or (at your option) +any later version. + +GCC is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +. */ + +#include + +#include +#include + +void +create_code (gccjit::context ctxt) +@{ + /* + Simple sum-of-squares, to test conditionals and looping + + int loop_test (int n) + @{ + int i; + int sum = 0; + for (i = 0; i < n ; i ++) + @{ + sum += i * i; + @} + return sum; + */ + gccjit::type the_type = ctxt.get_int_type (); + gccjit::type return_type = the_type; + + gccjit::param n = ctxt.new_param (the_type, "n"); + std::vector params; + params.push_back (n); + gccjit::function func = + ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + return_type, + "loop_test", + params, 0); + + /* Build locals: */ + gccjit::lvalue i = func.new_local (the_type, "i"); + gccjit::lvalue sum = func.new_local (the_type, "sum"); + + gccjit::block b_initial = func.new_block ("initial"); + gccjit::block b_loop_cond = func.new_block ("loop_cond"); + gccjit::block b_loop_body = func.new_block ("loop_body"); + gccjit::block b_after_loop = func.new_block ("after_loop"); + + /* sum = 0; */ + b_initial.add_assignment (sum, ctxt.zero (the_type)); + + /* i = 0; */ + b_initial.add_assignment (i, ctxt.zero (the_type)); + + b_initial.end_with_jump (b_loop_cond); + + /* if (i >= n) */ + b_loop_cond.end_with_conditional ( + i >= n, + b_after_loop, + b_loop_body); + + /* sum += i * i */ + b_loop_body.add_assignment_op (sum, + GCC_JIT_BINARY_OP_PLUS, + i * i); + + /* i++ */ + b_loop_body.add_assignment_op (i, + GCC_JIT_BINARY_OP_PLUS, + ctxt.one (the_type)); + + b_loop_body.end_with_jump (b_loop_cond); + + /* return sum */ + b_after_loop.end_with_return (sum); +@} + +int +main (int argc, char **argv) +@{ + gccjit::context ctxt; + gcc_jit_result *result = NULL; + + /* Get a "context" object for working with the library. */ + ctxt = gccjit::context::acquire (); + + /* Set some options on the context. + Turn this on to see the code being generated, in assembler form. */ + ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, + 0); + + /* Populate the context. */ + create_code (ctxt); + + /* Compile the code. */ + result = ctxt.compile (); + + ctxt.release (); + + if (!result) + @{ + fprintf (stderr, "NULL result"); + return 1; + @} + + /* Extract the generated code from "result". */ + typedef int (*loop_test_fn_type) (int); + loop_test_fn_type loop_test = + (loop_test_fn_type)gcc_jit_result_get_code (result, "loop_test"); + if (!loop_test) + @{ + fprintf (stderr, "NULL loop_test"); + gcc_jit_result_release (result); + return 1; + @} + + /* Run the generated code. */ + int val = loop_test (10); + printf("loop_test returned: %d\n", val); + + gcc_jit_result_release (result); + return 0; +@} +@end example +@end quotation + +Building and running it: + +@example +$ gcc \ + tut03-sum-of-squares.cc \ + -o tut03-sum-of-squares \ + -lgccjit + +# Run the built program: +$ ./tut03-sum-of-squares +loop_test returned: 285 +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Tutorial part 4 Adding JIT-compilation to a toy interpreter<2>,,Tutorial part 3 Loops and variables<2>,Tutorial<2> +@anchor{cp/intro/tutorial04 doc}@anchor{196}@anchor{cp/intro/tutorial04 tutorial-part-4-adding-jit-compilation-to-a-toy-interpreter}@anchor{197} +@subsection Tutorial part 4: Adding JIT-compilation to a toy interpreter + + +In this example we construct a “toy” interpreter, and add JIT-compilation +to it. + +@menu +* Our toy interpreter: Our toy interpreter<2>. +* Compiling to machine code: Compiling to machine code<2>. +* Setting things up: Setting things up<2>. +* Populating the function: Populating the function<2>. +* Verifying the control flow graph: Verifying the control flow graph<2>. +* Compiling the context: Compiling the context<2>. +* Single-stepping through the generated code: Single-stepping through the generated code<2>. +* Examining the generated code: Examining the generated code<2>. +* Putting it all together: Putting it all together<2>. +* Behind the curtain; How does our code get optimized?: Behind the curtain How does our code get optimized?<2>. + +@end menu + +@node Our toy interpreter<2>,Compiling to machine code<2>,,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 our-toy-interpreter}@anchor{198} +@subsubsection Our toy interpreter + + +It’s a stack-based interpreter, and is intended as a (very simple) example +of the kind of bytecode interpreter seen in dynamic languages such as +Python, Ruby etc. + +For the sake of simplicity, our toy virtual machine is very limited: + +@quotation + + +@itemize * + +@item +The only data type is @cite{int} + +@item +It can only work on one function at a time (so that the only +function call that can be made is to recurse). + +@item +Functions can only take one parameter. + +@item +Functions have a stack of @cite{int} values. + +@item +We’ll implement function call within the interpreter by calling a +function in our implementation, rather than implementing our own +frame stack. + +@item +The parser is only good enough to get the examples to work. +@end itemize +@end quotation + +Naturally, a real interpreter would be much more complicated that this. + +The following operations are supported: + + +@multitable {xxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxx} {xxxxxxxxxxxxxxxxxx} +@headitem + +Operation + +@tab + +Meaning + +@tab + +Old Stack + +@tab + +New Stack + +@item + +DUP + +@tab + +Duplicate top of stack. + +@tab + +@code{[..., x]} + +@tab + +@code{[..., x, x]} + +@item + +ROT + +@tab + +Swap top two elements +of stack. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., y, x]} + +@item + +BINARY_ADD + +@tab + +Add the top two elements +on the stack. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x+y)]} + +@item + +BINARY_SUBTRACT + +@tab + +Likewise, but subtract. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x-y)]} + +@item + +BINARY_MULT + +@tab + +Likewise, but multiply. + +@tab + +@code{[..., x, y]} + +@tab + +@code{[..., (x*y)]} + +@item + +BINARY_COMPARE_LT + +@tab + +Compare the top two +elements on the stack +and push a nonzero/zero +if (xop_opcode) + @{ + /* Ops taking no operand. */ + case DUP: + x = POP (); + PUSH (x); + PUSH (x); + break; + + case ROT: + y = POP (); + x = POP (); + PUSH (y); + PUSH (x); + break; + + case BINARY_ADD: + y = POP (); + x = POP (); + PUSH (x + y); + break; + + case BINARY_SUBTRACT: + y = POP (); + x = POP (); + PUSH (x - y); + break; + + case BINARY_MULT: + y = POP (); + x = POP (); + PUSH (x * y); + break; + + case BINARY_COMPARE_LT: + y = POP (); + x = POP (); + PUSH (x < y); + break; + + case RECURSE: + x = POP (); + x = interpret (x, trace); + PUSH (x); + break; + + case RETURN: + return POP (); + + /* Ops taking an operand. */ + case PUSH_CONST: + PUSH (op->op_operand); + break; + + case JUMP_ABS_IF_TRUE: + x = POP (); + if (x) + frame.frm_pc = op->op_operand; + break; + + default: + assert (0); /* unknown opcode */ + + @} /* end of switch on opcode */ + @} /* end of while loop */ + +#undef PUSH +#undef POP +@} + +@end example +@end quotation + +@node Compiling to machine code<2>,Setting things up<2>,Our toy interpreter<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 compiling-to-machine-code}@anchor{199} +@subsubsection Compiling to machine code + + +We want to generate machine code that can be cast to this type and +then directly executed in-process: + +@quotation + +@example +typedef int (*toyvm_compiled_func) (int); + +@end example +@end quotation + +Our compiler isn’t very sophisticated; it takes the implementation of +each opcode above, and maps it directly to the operations supported by +the libgccjit API. + +How should we handle the stack? In theory we could calculate what the +stack depth will be at each opcode, and optimize away the stack +manipulation “by hand”. We’ll see below that libgccjit is able to do +this for us, so we’ll implement stack manipulation +in a direct way, by creating a @code{stack} array and @code{stack_depth} +variables, local within the generated function, equivalent to this C code: + +@example +int stack_depth; +int stack[MAX_STACK_DEPTH]; +@end example + +We’ll also have local variables @code{x} and @code{y} for use when implementing +the opcodes, equivalent to this: + +@example +int x; +int y; +@end example + +This means our compiler has the following state: + +@quotation + +@example + + toyvm_function &toyvmfn; + + gccjit::context ctxt; + + gccjit::type int_type; + gccjit::type bool_type; + gccjit::type stack_type; /* int[MAX_STACK_DEPTH] */ + + gccjit::rvalue const_one; + + gccjit::function fn; + gccjit::param param_arg; + gccjit::lvalue stack; + gccjit::lvalue stack_depth; + gccjit::lvalue x; + gccjit::lvalue y; + + gccjit::location op_locs[MAX_OPS]; + gccjit::block initial_block; + gccjit::block op_blocks[MAX_OPS]; + +@end example +@end quotation + +@node Setting things up<2>,Populating the function<2>,Compiling to machine code<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 setting-things-up}@anchor{19a} +@subsubsection Setting things up + + +First we create our types: + +@quotation + +@example + +void +compilation_state::create_types () +@{ + /* Create types. */ + int_type = ctxt.get_type (GCC_JIT_TYPE_INT); + bool_type = ctxt.get_type (GCC_JIT_TYPE_BOOL); + stack_type = ctxt.new_array_type (int_type, MAX_STACK_DEPTH); + +@end example +@end quotation + +along with extracting a useful @cite{int} constant: + +@quotation + +@example + const_one = ctxt.one (int_type); + +@} + +@end example +@end quotation + +We’ll implement push and pop in terms of the @code{stack} array and +@code{stack_depth}. Here are helper functions for adding statements to +a block, implementing pushing and popping values: + +@quotation + +@example + +void +compilation_state::add_push (gccjit::block block, + gccjit::rvalue rvalue, + gccjit::location loc) +@{ + /* stack[stack_depth] = RVALUE */ + block.add_assignment ( + /* stack[stack_depth] */ + ctxt.new_array_access ( + stack, + stack_depth, + loc), + rvalue, + loc); + + /* "stack_depth++;". */ + block.add_assignment_op ( + stack_depth, + GCC_JIT_BINARY_OP_PLUS, + const_one, + loc); +@} + +void +compilation_state::add_pop (gccjit::block block, + gccjit::lvalue lvalue, + gccjit::location loc) +@{ + /* "--stack_depth;". */ + block.add_assignment_op ( + stack_depth, + GCC_JIT_BINARY_OP_MINUS, + const_one, + loc); + + /* "LVALUE = stack[stack_depth];". */ + block.add_assignment ( + lvalue, + /* stack[stack_depth] */ + ctxt.new_array_access (stack, + stack_depth, + loc), + loc); +@} + +@end example +@end quotation + +We will support single-stepping through the generated code in the +debugger, so we need to create @ref{19b,,gccjit;;location} instances, one +per operation in the source code. These will reference the lines of +e.g. @code{factorial.toy}. + +@quotation + +@example + +void +compilation_state::create_locations () +@{ + for (int pc = 0; pc < toyvmfn.fn_num_ops; pc++) + @{ + toyvm_op *op = &toyvmfn.fn_ops[pc]; + + op_locs[pc] = ctxt.new_location (toyvmfn.fn_filename, + op->op_linenum, + 0); /* column */ + @} +@} + +@end example +@end quotation + +Let’s create the function itself. As usual, we create its parameter +first, then use the parameter to create the function: + +@quotation + +@example + +void +compilation_state::create_function (const char *funcname) +@{ + std::vector params; + param_arg = ctxt.new_param (int_type, "arg", op_locs[0]); + params.push_back (param_arg); + fn = ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + int_type, + funcname, + params, 0, + op_locs[0]); + +@end example +@end quotation + +We create the locals within the function. + +@quotation + +@example + stack = fn.new_local (stack_type, "stack"); + stack_depth = fn.new_local (int_type, "stack_depth"); + x = fn.new_local (int_type, "x"); + y = fn.new_local (int_type, "y"); + +@end example +@end quotation + +@node Populating the function<2>,Verifying the control flow graph<2>,Setting things up<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 populating-the-function}@anchor{19c} +@subsubsection Populating the function + + +There’s some one-time initialization, and the API treats the first block +you create as the entrypoint of the function, so we need to create that +block first: + +@quotation + +@example + initial_block = fn.new_block ("initial"); + +@end example +@end quotation + +We can now create blocks for each of the operations. Most of these will +be consolidated into larger blocks when the optimizer runs. + +@quotation + +@example + for (int pc = 0; pc < toyvmfn.fn_num_ops; pc++) + @{ + char buf[100]; + sprintf (buf, "instr%i", pc); + op_blocks[pc] = fn.new_block (buf); + @} + +@end example +@end quotation + +Now that we have a block it can jump to when it’s done, we can populate +the initial block: + +@quotation + +@example + + /* "stack_depth = 0;". */ + initial_block.add_assignment (stack_depth, + ctxt.zero (int_type), + op_locs[0]); + + /* "PUSH (arg);". */ + add_push (initial_block, + param_arg, + op_locs[0]); + + /* ...and jump to insn 0. */ + initial_block.end_with_jump (op_blocks[0], + op_locs[0]); + +@end example +@end quotation + +We can now populate the blocks for the individual operations. We loop +through them, adding instructions to their blocks: + +@quotation + +@example + for (int pc = 0; pc < toyvmfn.fn_num_ops; pc++) + @{ + gccjit::location loc = op_locs[pc]; + + gccjit::block block = op_blocks[pc]; + gccjit::block next_block = (pc < toyvmfn.fn_num_ops + ? op_blocks[pc + 1] + : NULL); + + toyvm_op *op; + op = &toyvmfn.fn_ops[pc]; + +@end example +@end quotation + +We’re going to have another big @code{switch} statement for implementing +the opcodes, this time for compiling them, rather than interpreting +them. It’s helpful to have macros for implementing push and pop, so that +we can make the @code{switch} statement that’s coming up look as much as +possible like the one above within the interpreter: + +@example + +#define X_EQUALS_POP()\ + add_pop (block, x, loc) +#define Y_EQUALS_POP()\ + add_pop (block, y, loc) +#define PUSH_RVALUE(RVALUE)\ + add_push (block, (RVALUE), loc) +#define PUSH_X()\ + PUSH_RVALUE (x) +#define PUSH_Y() \ + PUSH_RVALUE (y) + +@end example + +@cartouche +@quotation Note +A particularly clever implementation would have an @emph{identical} +@code{switch} statement shared by the interpreter and the compiler, with +some preprocessor “magic”. We’re not doing that here, for the sake +of simplicity. +@end quotation +@end cartouche + +When I first implemented this compiler, I accidentally missed an edit +when copying and pasting the @code{Y_EQUALS_POP} macro, so that popping the +stack into @code{y} instead erroneously assigned it to @code{x}, leaving @code{y} +uninitialized. + +To track this kind of thing down, we can use +@ref{19d,,gccjit;;block;;add_comment()} to add descriptive comments +to the internal representation. This is invaluable when looking through +the generated IR for, say @code{factorial}: + +@quotation + +@example + + block.add_comment (opcode_names[op->op_opcode], loc); + +@end example +@end quotation + +We can now write the big @code{switch} statement that implements the +individual opcodes, populating the relevant block with statements: + +@quotation + +@example + + switch (op->op_opcode) + @{ + case DUP: + X_EQUALS_POP (); + PUSH_X (); + PUSH_X (); + break; + + case ROT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_Y (); + PUSH_X (); + break; + + case BINARY_ADD: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + ctxt.new_binary_op ( + GCC_JIT_BINARY_OP_PLUS, + int_type, + x, y, + loc)); + break; + + case BINARY_SUBTRACT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + ctxt.new_binary_op ( + GCC_JIT_BINARY_OP_MINUS, + int_type, + x, y, + loc)); + break; + + case BINARY_MULT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + ctxt.new_binary_op ( + GCC_JIT_BINARY_OP_MULT, + int_type, + x, y, + loc)); + break; + + case BINARY_COMPARE_LT: + Y_EQUALS_POP (); + X_EQUALS_POP (); + PUSH_RVALUE ( + /* cast of bool to int */ + ctxt.new_cast ( + /* (x < y) as a bool */ + ctxt.new_comparison ( + GCC_JIT_COMPARISON_LT, + x, y, + loc), + int_type, + loc)); + break; + + case RECURSE: + @{ + X_EQUALS_POP (); + PUSH_RVALUE ( + ctxt.new_call ( + fn, + x, + loc)); + break; + @} + + case RETURN: + X_EQUALS_POP (); + block.end_with_return (x, loc); + break; + + /* Ops taking an operand. */ + case PUSH_CONST: + PUSH_RVALUE ( + ctxt.new_rvalue (int_type, op->op_operand)); + break; + + case JUMP_ABS_IF_TRUE: + X_EQUALS_POP (); + block.end_with_conditional ( + /* "(bool)x". */ + ctxt.new_cast (x, bool_type, loc), + op_blocks[op->op_operand], /* on_true */ + next_block, /* on_false */ + loc); + break; + + default: + assert(0); + @} /* end of switch on opcode */ + +@end example +@end quotation + +Every block must be terminated, via a call to one of the +@code{gccjit::block::end_with_} entrypoints. This has been done for two +of the opcodes, but we need to do it for the other ones, by jumping +to the next block. + +@quotation + +@example + if (op->op_opcode != JUMP_ABS_IF_TRUE + && op->op_opcode != RETURN) + block.end_with_jump (next_block, loc); + +@end example +@end quotation + +This is analogous to simply incrementing the program counter. + +@node Verifying the control flow graph<2>,Compiling the context<2>,Populating the function<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 verifying-the-control-flow-graph}@anchor{19e} +@subsubsection Verifying the control flow graph + + +Having finished looping over the blocks, the context is complete. + +As before, we can verify that the control flow and statements are sane by +using @ref{194,,gccjit;;function;;dump_to_dot()}: + +@example +fn.dump_to_dot ("/tmp/factorial.dot"); +@end example + +and viewing the result. Note how the label names, comments, and +variable names show up in the dump, to make it easier to spot +errors in our compiler. + +@quotation + + +@float Figure + +@image{libgccjit-figures/factorial,,,image of a control flow graph,png} + +@end float + +@end quotation + +@node Compiling the context<2>,Single-stepping through the generated code<2>,Verifying the control flow graph<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 compiling-the-context}@anchor{19f} +@subsubsection Compiling the context + + +Having finished looping over the blocks and populating them with +statements, the context is complete. + +We can now compile it, extract machine code from the result, and +run it: + +@quotation + +@example + +class compilation_result +@{ +public: + compilation_result (gcc_jit_result *result) : + m_result (result) + @{ + @} + ~compilation_result () + @{ + gcc_jit_result_release (m_result); + @} + + void *get_code (const char *funcname) + @{ + return gcc_jit_result_get_code (m_result, funcname); + @} + +private: + gcc_jit_result *m_result; +@}; + +@end example + +@example + compilation_result compiler_result = fn->compile (); + + const char *funcname = fn->get_function_name (); + toyvm_compiled_func code + = (toyvm_compiled_func)compiler_result.get_code (funcname); + + printf ("compiler result: %d\n", + code (atoi (argv[2]))); + +@end example +@end quotation + +@node Single-stepping through the generated code<2>,Examining the generated code<2>,Compiling the context<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 single-stepping-through-the-generated-code}@anchor{1a0} +@subsubsection Single-stepping through the generated code + + +It’s possible to debug the generated code. To do this we need to both: + +@quotation + + +@itemize * + +@item +Set up source code locations for our statements, so that we can +meaningfully step through the code. We did this above by +calling @ref{1a1,,gccjit;;context;;new_location()} and using the +results. + +@item +Enable the generation of debugging information, by setting +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} on the +@ref{175,,gccjit;;context} via +@ref{181,,gccjit;;context;;set_bool_option()}: + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DEBUGINFO, 1); +@end example +@end itemize +@end quotation + +Having done this, we can put a breakpoint on the generated function: + +@example +$ gdb --args ./toyvm factorial.toy 10 +(gdb) break factorial +Function "factorial" not defined. +Make breakpoint pending on future shared library load? (y or [n]) y +Breakpoint 1 (factorial) pending. +(gdb) run +Breakpoint 1, factorial (arg=10) at factorial.toy:14 +14 DUP +@end example + +We’ve set up location information, which references @code{factorial.toy}. +This allows us to use e.g. @code{list} to see where we are in the script: + +@example +(gdb) list +9 +10 # Initial state: +11 # stack: [arg] +12 +13 # 0: +14 DUP +15 # stack: [arg, arg] +16 +17 # 1: +18 PUSH_CONST 2 +@end example + +and to step through the function, examining the data: + +@example +(gdb) n +18 PUSH_CONST 2 +(gdb) n +22 BINARY_COMPARE_LT +(gdb) print stack +$5 = @{10, 10, 2, 0, -7152, 32767, 0, 0@} +(gdb) print stack_depth +$6 = 3 +@end example + +You’ll see that the parts of the @code{stack} array that haven’t been +touched yet are uninitialized. + +@cartouche +@quotation Note +Turning on optimizations may lead to unpredictable results when +stepping through the generated code: the execution may appear to +“jump around” the source code. This is analogous to turning up the +optimization level in a regular compiler. +@end quotation +@end cartouche + +@node Examining the generated code<2>,Putting it all together<2>,Single-stepping through the generated code<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 examining-the-generated-code}@anchor{1a2} +@subsubsection Examining the generated code + + +How good is the optimized code? + +We can turn up optimizations, by calling +@ref{182,,gccjit;;context;;set_int_option()} with +@ref{1f,,GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL}: + +@example +ctxt.set_int_option (GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 3); +@end example + +One of GCC’s internal representations is called “gimple”. A dump of the +initial gimple representation of the code can be seen by setting: + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE, 1); +@end example + +With optimization on and source locations displayed, this gives: + +@c We'll use "c" for gimple dumps + +@example +factorial (signed int arg) +@{ + D.80; + signed int D.81; + signed int D.82; + signed int D.83; + signed int D.84; + signed int D.85; + signed int y; + signed int x; + signed int stack_depth; + signed int stack[8]; + + try + @{ + initial: + stack_depth = 0; + stack[stack_depth] = arg; + stack_depth = stack_depth + 1; + goto instr0; + instr0: + /* DUP */: + stack_depth = stack_depth + -1; + x = stack[stack_depth]; + stack[stack_depth] = x; + stack_depth = stack_depth + 1; + stack[stack_depth] = x; + stack_depth = stack_depth + 1; + goto instr1; + instr1: + /* PUSH_CONST */: + stack[stack_depth] = 2; + stack_depth = stack_depth + 1; + goto instr2; + + /* etc */ +@end example + +You can see the generated machine code in assembly form via: + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE, 1); +result = ctxt.compile (); +@end example + +which shows that (on this x86_64 box) the compiler has unrolled the loop +and is using MMX instructions to perform several multiplications +simultaneously: + +@example + .file "fake.c" + .text +.Ltext0: + .p2align 4,,15 + .globl factorial + .type factorial, @@function +factorial: +.LFB0: + .file 1 "factorial.toy" + .loc 1 14 0 + .cfi_startproc +.LVL0: +.L2: + .loc 1 26 0 + cmpl $1, %edi + jle .L13 + leal -1(%rdi), %edx + movl %edx, %ecx + shrl $2, %ecx + leal 0(,%rcx,4), %esi + testl %esi, %esi + je .L14 + cmpl $9, %edx + jbe .L14 + leal -2(%rdi), %eax + movl %eax, -16(%rsp) + leal -3(%rdi), %eax + movd -16(%rsp), %xmm0 + movl %edi, -16(%rsp) + movl %eax, -12(%rsp) + movd -16(%rsp), %xmm1 + xorl %eax, %eax + movl %edx, -16(%rsp) + movd -12(%rsp), %xmm4 + movd -16(%rsp), %xmm6 + punpckldq %xmm4, %xmm0 + movdqa .LC1(%rip), %xmm4 + punpckldq %xmm6, %xmm1 + punpcklqdq %xmm0, %xmm1 + movdqa .LC0(%rip), %xmm0 + jmp .L5 + # etc - edited for brevity +@end example + +This is clearly overkill for a function that will likely overflow the +@code{int} type before the vectorization is worthwhile - but then again, this +is a toy example. + +Turning down the optimization level to 2: + +@example +ctxt.set_int_option (GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL, 2); +@end example + +yields this code, which is simple enough to quote in its entirety: + +@example + .file "fake.c" + .text + .p2align 4,,15 + .globl factorial + .type factorial, @@function +factorial: +.LFB0: + .cfi_startproc +.L2: + cmpl $1, %edi + jle .L8 + movl $1, %edx + jmp .L4 + .p2align 4,,10 + .p2align 3 +.L6: + movl %eax, %edi +.L4: +.L5: + leal -1(%rdi), %eax + imull %edi, %edx + cmpl $1, %eax + jne .L6 +.L3: +.L7: + imull %edx, %eax + ret +.L8: + movl %edi, %eax + movl $1, %edx + jmp .L7 + .cfi_endproc +.LFE0: + .size factorial, .-factorial + .ident "GCC: (GNU) 4.9.0 20131023 (Red Hat 0.2-%@{gcc_release@})" + .section .note.GNU-stack,"",@@progbits +@end example + +Note that the stack pushing and popping have been eliminated, as has the +recursive call (in favor of an iteration). + +@node Putting it all together<2>,Behind the curtain How does our code get optimized?<2>,Examining the generated code<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 putting-it-all-together}@anchor{1a3} +@subsubsection Putting it all together + + +The complete example can be seen in the source tree at +@code{gcc/jit/docs/examples/tut04-toyvm/toyvm.cc} + +along with a Makefile and a couple of sample .toy scripts: + +@example +$ ls -al +drwxrwxr-x. 2 david david 4096 Sep 19 17:46 . +drwxrwxr-x. 3 david david 4096 Sep 19 15:26 .. +-rw-rw-r--. 1 david david 615 Sep 19 12:43 factorial.toy +-rw-rw-r--. 1 david david 834 Sep 19 13:08 fibonacci.toy +-rw-rw-r--. 1 david david 238 Sep 19 14:22 Makefile +-rw-rw-r--. 1 david david 16457 Sep 19 17:07 toyvm.cc + +$ make toyvm +g++ -Wall -g -o toyvm toyvm.cc -lgccjit + +$ ./toyvm factorial.toy 10 +interpreter result: 3628800 +compiler result: 3628800 + +$ ./toyvm fibonacci.toy 10 +interpreter result: 55 +compiler result: 55 +@end example + +@node Behind the curtain How does our code get optimized?<2>,,Putting it all together<2>,Tutorial part 4 Adding JIT-compilation to a toy interpreter<2> +@anchor{cp/intro/tutorial04 behind-the-curtain-how-does-our-code-get-optimized}@anchor{1a4} +@subsubsection Behind the curtain: How does our code get optimized? + + +Our example is done, but you may be wondering about exactly how the +compiler turned what we gave it into the machine code seen above. + +We can examine what the compiler is doing in detail by setting: + +@example +state.ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING, 1); +state.ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES, 1); +@end example + +This will dump detailed information about the compiler’s state to a +directory under @code{/tmp}, and keep it from being cleaned up. + +The precise names and their formats of these files is subject to change. +Higher optimization levels lead to more files. +Here’s what I saw (edited for brevity; there were almost 200 files): + +@example +intermediate files written to /tmp/libgccjit-KPQbGw +$ ls /tmp/libgccjit-KPQbGw/ +fake.c.000i.cgraph +fake.c.000i.type-inheritance +fake.c.004t.gimple +fake.c.007t.omplower +fake.c.008t.lower +fake.c.011t.eh +fake.c.012t.cfg +fake.c.014i.visibility +fake.c.015i.early_local_cleanups +fake.c.016t.ssa +# etc +@end example + +The gimple code is converted into Static Single Assignment form, +with annotations for use when generating the debuginfo: + +@example +$ less /tmp/libgccjit-KPQbGw/fake.c.016t.ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + signed int _56; + +initial: + stack_depth_3 = 0; + # DEBUG stack_depth => stack_depth_3 + stack[stack_depth_3] = arg_5(D); + stack_depth_7 = stack_depth_3 + 1; + # DEBUG stack_depth => stack_depth_7 + # DEBUG instr0 => NULL + # DEBUG /* DUP */ => NULL + stack_depth_8 = stack_depth_7 + -1; + # DEBUG stack_depth => stack_depth_8 + x_9 = stack[stack_depth_8]; + # DEBUG x => x_9 + stack[stack_depth_8] = x_9; + stack_depth_11 = stack_depth_8 + 1; + # DEBUG stack_depth => stack_depth_11 + stack[stack_depth_11] = x_9; + stack_depth_13 = stack_depth_11 + 1; + # DEBUG stack_depth => stack_depth_13 + # DEBUG instr1 => NULL + # DEBUG /* PUSH_CONST */ => NULL + stack[stack_depth_13] = 2; + + /* etc; edited for brevity */ +@end example + +We can perhaps better see the code by turning off +@ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} to suppress all those @code{DEBUG} +statements, giving: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.016t.ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + signed int _56; + +initial: + stack_depth_3 = 0; + stack[stack_depth_3] = arg_5(D); + stack_depth_7 = stack_depth_3 + 1; + stack_depth_8 = stack_depth_7 + -1; + x_9 = stack[stack_depth_8]; + stack[stack_depth_8] = x_9; + stack_depth_11 = stack_depth_8 + 1; + stack[stack_depth_11] = x_9; + stack_depth_13 = stack_depth_11 + 1; + stack[stack_depth_13] = 2; + stack_depth_15 = stack_depth_13 + 1; + stack_depth_16 = stack_depth_15 + -1; + y_17 = stack[stack_depth_16]; + stack_depth_18 = stack_depth_16 + -1; + x_19 = stack[stack_depth_18]; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack[stack_depth_18] = _21; + stack_depth_23 = stack_depth_18 + 1; + stack_depth_24 = stack_depth_23 + -1; + x_25 = stack[stack_depth_24]; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + stack_depth_26 = stack_depth_24 + -1; + x_27 = stack[stack_depth_26]; + stack[stack_depth_26] = x_27; + stack_depth_29 = stack_depth_26 + 1; + stack[stack_depth_29] = x_27; + stack_depth_31 = stack_depth_29 + 1; + stack[stack_depth_31] = 1; + stack_depth_33 = stack_depth_31 + 1; + stack_depth_34 = stack_depth_33 + -1; + y_35 = stack[stack_depth_34]; + stack_depth_36 = stack_depth_34 + -1; + x_37 = stack[stack_depth_36]; + _38 = x_37 - y_35; + stack[stack_depth_36] = _38; + stack_depth_40 = stack_depth_36 + 1; + stack_depth_41 = stack_depth_40 + -1; + x_42 = stack[stack_depth_41]; + _44 = factorial (x_42); + stack[stack_depth_41] = _44; + stack_depth_46 = stack_depth_41 + 1; + stack_depth_47 = stack_depth_46 + -1; + y_48 = stack[stack_depth_47]; + stack_depth_49 = stack_depth_47 + -1; + x_50 = stack[stack_depth_49]; + _51 = x_50 * y_48; + stack[stack_depth_49] = _51; + stack_depth_53 = stack_depth_49 + 1; + + # stack_depth_1 = PHI +instr9: +/* RETURN */: + stack_depth_54 = stack_depth_1 + -1; + x_55 = stack[stack_depth_54]; + _56 = x_55; + stack =@{v@} @{CLOBBER@}; + return _56; + +@} +@end example + +Note in the above how all the @ref{18b,,gccjit;;block} instances we +created have been consolidated into just 3 blocks in GCC’s internal +representation: @code{initial}, @code{instr4} and @code{instr9}. + +@menu +* Optimizing away stack manipulation: Optimizing away stack manipulation<2>. +* Elimination of tail recursion: Elimination of tail recursion<2>. + +@end menu + +@node Optimizing away stack manipulation<2>,Elimination of tail recursion<2>,,Behind the curtain How does our code get optimized?<2> +@anchor{cp/intro/tutorial04 optimizing-away-stack-manipulation}@anchor{1a5} +@subsubsection Optimizing away stack manipulation + + +Recall our simple implementation of stack operations. Let’s examine +how the stack operations are optimized away. + +After a pass of constant-propagation, the depth of the stack at each +opcode can be determined at compile-time: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.021t.ccp1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack[0] = arg_5(D); + x_9 = stack[0]; + stack[0] = x_9; + stack[1] = x_9; + stack[2] = 2; + y_17 = stack[2]; + x_19 = stack[1]; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack[1] = _21; + x_25 = stack[1]; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + x_27 = stack[0]; + stack[0] = x_27; + stack[1] = x_27; + stack[2] = 1; + y_35 = stack[2]; + x_37 = stack[1]; + _38 = x_37 - y_35; + stack[1] = _38; + x_42 = stack[1]; + _44 = factorial (x_42); + stack[1] = _44; + y_48 = stack[1]; + x_50 = stack[0]; + _51 = x_50 * y_48; + stack[0] = _51; + +instr9: +/* RETURN */: + x_55 = stack[0]; + x_56 = x_55; + stack =@{v@} @{CLOBBER@}; + return x_56; + +@} +@end example + +Note how, in the above, all those @code{stack_depth} values are now just +constants: we’re accessing specific stack locations at each opcode. + +The “esra” pass (“Early Scalar Replacement of Aggregates”) breaks +out our “stack” array into individual elements: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.024t.esra +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +Created a replacement for stack offset: 0, size: 32: stack$0 +Created a replacement for stack offset: 32, size: 32: stack$1 +Created a replacement for stack offset: 64, size: 32: stack$2 + +Symbols to be put in SSA form +@{ D.89 D.90 D.91 @} +Incremental SSA update started at block: 0 +Number of blocks in CFG: 5 +Number of blocks to update: 4 ( 80%) + + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack$0_45 = arg_5(D); + x_9 = stack$0_45; + stack$0_39 = x_9; + stack$1_32 = x_9; + stack$2_30 = 2; + y_17 = stack$2_30; + x_19 = stack$1_32; + _20 = x_19 < y_17; + _21 = (signed int) _20; + stack$1_28 = _21; + x_25 = stack$1_28; + if (x_25 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + x_27 = stack$0_39; + stack$0_22 = x_27; + stack$1_14 = x_27; + stack$2_12 = 1; + y_35 = stack$2_12; + x_37 = stack$1_14; + _38 = x_37 - y_35; + stack$1_10 = _38; + x_42 = stack$1_10; + _44 = factorial (x_42); + stack$1_6 = _44; + y_48 = stack$1_6; + x_50 = stack$0_22; + _51 = x_50 * y_48; + stack$0_1 = _51; + + # stack$0_52 = PHI +instr9: +/* RETURN */: + x_55 = stack$0_52; + x_56 = x_55; + stack =@{v@} @{CLOBBER@}; + return x_56; + +@} +@end example + +Hence at this point, all those pushes and pops of the stack are now +simply assignments to specific temporary variables. + +After some copy propagation, the stack manipulation has been completely +optimized away: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.026t.copyprop1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + _20; + signed int _21; + signed int _38; + signed int _44; + signed int _51; + +initial: + stack$0_39 = arg_5(D); + _20 = arg_5(D) <= 1; + _21 = (signed int) _20; + if (_21 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _38 = arg_5(D) + -1; + _44 = factorial (_38); + _51 = arg_5(D) * _44; + stack$0_1 = _51; + + # stack$0_52 = PHI +instr9: +/* RETURN */: + stack =@{v@} @{CLOBBER@}; + return stack$0_52; + +@} +@end example + +Later on, another pass finally eliminated @code{stack_depth} local and the +unused parts of the @cite{stack`} array altogether: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.036t.release_ssa +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + +Released 44 names, 314.29%, removed 44 holes +factorial (signed int arg) +@{ + signed int stack$0; + signed int mult_acc_1; + _5; + signed int _6; + signed int _7; + signed int mul_tmp_10; + signed int mult_acc_11; + signed int mult_acc_13; + + # arg_9 = PHI + # mult_acc_13 = PHI <1(0)> +initial: + + : + # arg_4 = PHI + # mult_acc_1 = PHI + _5 = arg_4 <= 1; + _6 = (signed int) _5; + if (_6 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _7 = arg_4 + -1; + mult_acc_11 = mult_acc_1 * arg_4; + goto ; + + # stack$0_12 = PHI +instr9: +/* RETURN */: + mul_tmp_10 = mult_acc_1 * stack$0_12; + return mul_tmp_10; + +@} +@end example + +@node Elimination of tail recursion<2>,,Optimizing away stack manipulation<2>,Behind the curtain How does our code get optimized?<2> +@anchor{cp/intro/tutorial04 elimination-of-tail-recursion}@anchor{1a6} +@subsubsection Elimination of tail recursion + + +Another significant optimization is the detection that the call to +@code{factorial} is tail recursion, which can be eliminated in favor of +an iteration: + +@example +$ less /tmp/libgccjit-1Hywc0/fake.c.030t.tailr1 +@end example + +@example +;; Function factorial (factorial, funcdef_no=0, decl_uid=53, symbol_order=0) + + +Symbols to be put in SSA form +@{ D.88 @} +Incremental SSA update started at block: 0 +Number of blocks in CFG: 5 +Number of blocks to update: 4 ( 80%) + + +factorial (signed int arg) +@{ + signed int stack$2; + signed int stack$1; + signed int stack$0; + signed int stack[8]; + signed int stack_depth; + signed int x; + signed int y; + signed int mult_acc_1; + _20; + signed int _21; + signed int _38; + signed int mul_tmp_44; + signed int mult_acc_51; + + # arg_5 = PHI + # mult_acc_1 = PHI <1(0), mult_acc_51(3)> +initial: + _20 = arg_5 <= 1; + _21 = (signed int) _20; + if (_21 != 0) + goto (instr9); + else + goto (instr4); + +instr4: +/* DUP */: + _38 = arg_5 + -1; + mult_acc_51 = mult_acc_1 * arg_5; + goto (initial); + + # stack$0_52 = PHI +instr9: +/* RETURN */: + stack =@{v@} @{CLOBBER@}; + mul_tmp_44 = mult_acc_1 * stack$0_52; + return mul_tmp_44; + +@} +@end example + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Topic Reference<2>,,Tutorial<2>,C++ bindings for libgccjit +@anchor{cp/topics/index doc}@anchor{1a7}@anchor{cp/topics/index topic-reference}@anchor{1a8} +@section Topic Reference + + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@menu +* Compilation contexts: Compilation contexts<2>. +* Objects: Objects<2>. +* Types: Types<2>. +* Expressions: Expressions<2>. +* Creating and using functions: Creating and using functions<2>. +* Source Locations: Source Locations<2>. +* Compiling a context: Compiling a context<2>. +* Using Assembly Language with libgccjit++:: + +@end menu + +@node Compilation contexts<2>,Objects<2>,,Topic Reference<2> +@anchor{cp/topics/contexts doc}@anchor{1a9}@anchor{cp/topics/contexts compilation-contexts}@anchor{1aa} +@subsection Compilation contexts + + +@geindex gccjit;;context (C++ class) +@anchor{cp/topics/contexts _CPPv4N6gccjit7contextE}@anchor{175}@anchor{cp/topics/contexts _CPPv3N6gccjit7contextE}@anchor{1ab}@anchor{cp/topics/contexts _CPPv2N6gccjit7contextE}@anchor{1ac}@anchor{cp/topics/contexts gccjit context}@anchor{1ad} +@deffn {C++ Class} gccjit::context +@end deffn + +The top-level of the C++ API is the @ref{175,,gccjit;;context} type. + +A @ref{175,,gccjit;;context} instance encapsulates the state of a +compilation. + +You can set up options on it, and add types, functions and code. +Invoking @ref{17f,,gccjit;;context;;compile()} on it gives you a +@ref{16,,gcc_jit_result *}. + +It is a thin wrapper around the C API’s @ref{8,,gcc_jit_context *}. + +@menu +* Lifetime-management: Lifetime-management<2>. +* Thread-safety: Thread-safety<2>. +* Error-handling: Error-handling<3>. +* Debugging: Debugging<2>. +* Options: Options<4>. + +@end menu + +@node Lifetime-management<2>,Thread-safety<2>,,Compilation contexts<2> +@anchor{cp/topics/contexts lifetime-management}@anchor{1ae} +@subsubsection Lifetime-management + + +Contexts are the unit of lifetime-management within the API: objects +have their lifetime bounded by the context they are created within, and +cleanup of such objects is done for you when the context is released. + +@geindex gccjit;;context;;acquire (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context7acquireEv}@anchor{176}@anchor{cp/topics/contexts _CPPv3N6gccjit7context7acquireEv}@anchor{1af}@anchor{cp/topics/contexts _CPPv2N6gccjit7context7acquireEv}@anchor{1b0}@anchor{cp/topics/contexts gccjit context acquire}@anchor{1b1} +@deffn {C++ Function} gccjit::@ref{175,,context} gccjit::@ref{175,,context}::acquire () + +This function acquires a new @ref{175,,gccjit;;context} instance, +which is independent of any others that may be present within this +process. +@end deffn + +@geindex gccjit;;context;;release (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context7releaseEv}@anchor{179}@anchor{cp/topics/contexts _CPPv3N6gccjit7context7releaseEv}@anchor{1b2}@anchor{cp/topics/contexts _CPPv2N6gccjit7context7releaseEv}@anchor{1b3}@anchor{cp/topics/contexts gccjit context release}@anchor{1b4} +@deffn {C++ Function} void gccjit::@ref{175,,context}::release () + +This function releases all resources associated with the given context. +Both the context itself and all of its @code{gccjit::object *} +instances are cleaned up. It should be called exactly once on a given +context. + +It is invalid to use the context or any of its “contextual” objects +after calling this. + +@example +ctxt.release (); +@end example +@end deffn + +@geindex gccjit;;context;;new_child_context (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context17new_child_contextEv}@anchor{1b5}@anchor{cp/topics/contexts _CPPv3N6gccjit7context17new_child_contextEv}@anchor{1b6}@anchor{cp/topics/contexts _CPPv2N6gccjit7context17new_child_contextEv}@anchor{1b7}@anchor{cp/topics/contexts gccjit context new_child_context}@anchor{1b8} +@deffn {C++ Function} gccjit::@ref{175,,context} gccjit::@ref{175,,context}::new_child_context () + +Given an existing JIT context, create a child context. + +The child inherits a copy of all option-settings from the parent. + +The child can reference objects created within the parent, but not +vice-versa. + +The lifetime of the child context must be bounded by that of the +parent: you should release a child context before releasing the parent +context. + +If you use a function from a parent context within a child context, +you have to compile the parent context before you can compile the +child context, and the gccjit::result of the parent context must +outlive the gccjit::result of the child context. + +This allows caching of shared initializations. For example, you could +create types and declarations of global functions in a parent context +once within a process, and then create child contexts whenever a +function or loop becomes hot. Each such child context can be used for +JIT-compiling just one function or loop, but can reference types +and helper functions created within the parent context. + +Contexts can be arbitrarily nested, provided the above rules are +followed, but it’s probably not worth going above 2 or 3 levels, and +there will likely be a performance hit for such nesting. +@end deffn + +@node Thread-safety<2>,Error-handling<3>,Lifetime-management<2>,Compilation contexts<2> +@anchor{cp/topics/contexts thread-safety}@anchor{1b9} +@subsubsection Thread-safety + + +Instances of @ref{175,,gccjit;;context} created via +@ref{176,,gccjit;;context;;acquire()} are independent from each other: +only one thread may use a given context at once, but multiple threads +could each have their own contexts without needing locks. + +Contexts created via @ref{1b5,,gccjit;;context;;new_child_context()} are +related to their parent context. They can be partitioned by their +ultimate ancestor into independent “family trees”. Only one thread +within a process may use a given “family tree” of such contexts at once, +and if you’re using multiple threads you should provide your own locking +around entire such context partitions. + +@node Error-handling<3>,Debugging<2>,Thread-safety<2>,Compilation contexts<2> +@anchor{cp/topics/contexts error-handling}@anchor{1ba} +@subsubsection Error-handling + + +@c FIXME: How does error-handling work for C++ API? + +You can only compile and get code from a context if no errors occur. + +In general, if an error occurs when using an API entrypoint, it returns +NULL. You don’t have to check everywhere for NULL results, since the +API gracefully handles a NULL being passed in for any argument. + +Errors are printed on stderr and can be queried using +@ref{1bb,,gccjit;;context;;get_first_error()}. + +@geindex gccjit;;context;;get_first_error (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context15get_first_errorEPN6gccjit7contextE}@anchor{1bb}@anchor{cp/topics/contexts _CPPv3N6gccjit7context15get_first_errorEPN6gccjit7contextE}@anchor{1bc}@anchor{cp/topics/contexts _CPPv2N6gccjit7context15get_first_errorEPN6gccjit7contextE}@anchor{1bd}@anchor{cp/topics/contexts gccjit context get_first_error__gccjit contextP}@anchor{1be} +@deffn {C++ Function} const char *gccjit::@ref{175,,context}::get_first_error (gccjit::context *ctxt) + +Returns the first error message that occurred on the context. + +The returned string is valid for the rest of the lifetime of the +context. + +If no errors occurred, this will be NULL. +@end deffn + +@node Debugging<2>,Options<4>,Error-handling<3>,Compilation contexts<2> +@anchor{cp/topics/contexts debugging}@anchor{1bf} +@subsubsection Debugging + + +@geindex gccjit;;context;;dump_to_file (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context12dump_to_fileERKNSt6stringEi}@anchor{1c0}@anchor{cp/topics/contexts _CPPv3N6gccjit7context12dump_to_fileERKNSt6stringEi}@anchor{1c1}@anchor{cp/topics/contexts _CPPv2N6gccjit7context12dump_to_fileERKNSt6stringEi}@anchor{1c2}@anchor{cp/topics/contexts gccjit context dump_to_file__ssCR i}@anchor{1c3} +@deffn {C++ Function} void gccjit::@ref{175,,context}::dump_to_file (const std::string &path, int update_locations) + +To help with debugging: dump a C-like representation to the given path, +describing what’s been set up on the context. + +If “update_locations” is true, then also set up @ref{19b,,gccjit;;location} +information throughout the context, pointing at the dump file as if it +were a source file. This may be of use in conjunction with +@code{GCCJIT::BOOL_OPTION_DEBUGINFO} to allow stepping through the +code in a debugger. +@end deffn + +@geindex gccjit;;context;;dump_reproducer_to_file (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context23dump_reproducer_to_fileEP15gcc_jit_contextPKc}@anchor{1c4}@anchor{cp/topics/contexts _CPPv3N6gccjit7context23dump_reproducer_to_fileEP15gcc_jit_contextPKc}@anchor{1c5}@anchor{cp/topics/contexts _CPPv2N6gccjit7context23dump_reproducer_to_fileEP15gcc_jit_contextPKc}@anchor{1c6}@anchor{cp/topics/contexts gccjit context dump_reproducer_to_file__gcc_jit_contextP cCP}@anchor{1c7} +@deffn {C++ Function} void gccjit::@ref{175,,context}::dump_reproducer_to_file (gcc_jit_context *ctxt, const char *path) + +This is a thin wrapper around the C API +@ref{5d,,gcc_jit_context_dump_reproducer_to_file()}, and hence works the +same way. + +Note that the generated source is C code, not C++; this might be of use +for seeing what the C++ bindings are doing at the C level. +@end deffn + +@node Options<4>,,Debugging<2>,Compilation contexts<2> +@anchor{cp/topics/contexts options}@anchor{1c8} +@subsubsection Options + + +@menu +* String Options: String Options<2>. +* Boolean options: Boolean options<2>. +* Integer options: Integer options<2>. +* Additional command-line options: Additional command-line options<2>. + +@end menu + +@node String Options<2>,Boolean options<2>,,Options<4> +@anchor{cp/topics/contexts string-options}@anchor{1c9} +@subsubsection String Options + + +@geindex gccjit;;context;;set_str_option (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context14set_str_optionE18gcc_jit_str_optionPKc}@anchor{1ca}@anchor{cp/topics/contexts _CPPv3N6gccjit7context14set_str_optionE18gcc_jit_str_optionPKc}@anchor{1cb}@anchor{cp/topics/contexts _CPPv2N6gccjit7context14set_str_optionE18gcc_jit_str_optionPKc}@anchor{1cc}@anchor{cp/topics/contexts gccjit context set_str_option__gcc_jit_str_option cCP}@anchor{1cd} +@deffn {C++ Function} void gccjit::@ref{175,,context}::set_str_option (enum gcc_jit_str_option, const char *value) + +Set a string option of the context. + +This is a thin wrapper around the C API +@ref{61,,gcc_jit_context_set_str_option()}; the options have the same +meaning. +@end deffn + +@node Boolean options<2>,Integer options<2>,String Options<2>,Options<4> +@anchor{cp/topics/contexts boolean-options}@anchor{1ce} +@subsubsection Boolean options + + +@geindex gccjit;;context;;set_bool_option (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context15set_bool_optionE19gcc_jit_bool_optioni}@anchor{181}@anchor{cp/topics/contexts _CPPv3N6gccjit7context15set_bool_optionE19gcc_jit_bool_optioni}@anchor{1cf}@anchor{cp/topics/contexts _CPPv2N6gccjit7context15set_bool_optionE19gcc_jit_bool_optioni}@anchor{1d0}@anchor{cp/topics/contexts gccjit context set_bool_option__gcc_jit_bool_option i}@anchor{1d1} +@deffn {C++ Function} void gccjit::@ref{175,,context}::set_bool_option (enum gcc_jit_bool_option, int value) + +Set a boolean option of the context. + +This is a thin wrapper around the C API +@ref{1b,,gcc_jit_context_set_bool_option()}; the options have the same +meaning. +@end deffn + +@geindex gccjit;;context;;set_bool_allow_unreachable_blocks (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context33set_bool_allow_unreachable_blocksEi}@anchor{1d2}@anchor{cp/topics/contexts _CPPv3N6gccjit7context33set_bool_allow_unreachable_blocksEi}@anchor{1d3}@anchor{cp/topics/contexts _CPPv2N6gccjit7context33set_bool_allow_unreachable_blocksEi}@anchor{1d4}@anchor{cp/topics/contexts gccjit context set_bool_allow_unreachable_blocks__i}@anchor{1d5} +@deffn {C++ Function} void gccjit::@ref{175,,context}::set_bool_allow_unreachable_blocks (int bool_value) + +By default, libgccjit will issue an error about unreachable blocks +within a function. + +This entrypoint can be used to disable that error; it is a thin wrapper +around the C API +@ref{6b,,gcc_jit_context_set_bool_allow_unreachable_blocks()}. + +This entrypoint was added in @ref{6c,,LIBGCCJIT_ABI_2}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_set_bool_allow_unreachable_blocks +@end example +@end deffn + +@geindex gccjit;;context;;set_bool_use_external_driver (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context28set_bool_use_external_driverEi}@anchor{1d6}@anchor{cp/topics/contexts _CPPv3N6gccjit7context28set_bool_use_external_driverEi}@anchor{1d7}@anchor{cp/topics/contexts _CPPv2N6gccjit7context28set_bool_use_external_driverEi}@anchor{1d8}@anchor{cp/topics/contexts gccjit context set_bool_use_external_driver__i}@anchor{1d9} +@deffn {C++ Function} void gccjit::@ref{175,,context}::set_bool_use_external_driver (int bool_value) + +libgccjit internally generates assembler, and uses “driver” code +for converting it to other formats (e.g. shared libraries). + +By default, libgccjit will use an embedded copy of the driver +code. + +This option can be used to instead invoke an external driver executable +as a subprocess; it is a thin wrapper around the C API +@ref{6d,,gcc_jit_context_set_bool_use_external_driver()}. + +This entrypoint was added in @ref{6e,,LIBGCCJIT_ABI_5}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_set_bool_use_external_driver +@end example +@end deffn + +@node Integer options<2>,Additional command-line options<2>,Boolean options<2>,Options<4> +@anchor{cp/topics/contexts integer-options}@anchor{1da} +@subsubsection Integer options + + +@geindex gccjit;;context;;set_int_option (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context14set_int_optionE18gcc_jit_int_optioni}@anchor{182}@anchor{cp/topics/contexts _CPPv3N6gccjit7context14set_int_optionE18gcc_jit_int_optioni}@anchor{1db}@anchor{cp/topics/contexts _CPPv2N6gccjit7context14set_int_optionE18gcc_jit_int_optioni}@anchor{1dc}@anchor{cp/topics/contexts gccjit context set_int_option__gcc_jit_int_option i}@anchor{1dd} +@deffn {C++ Function} void gccjit::@ref{175,,context}::set_int_option (enum gcc_jit_int_option, int value) + +Set an integer option of the context. + +This is a thin wrapper around the C API +@ref{1e,,gcc_jit_context_set_int_option()}; the options have the same +meaning. +@end deffn + +@node Additional command-line options<2>,,Integer options<2>,Options<4> +@anchor{cp/topics/contexts additional-command-line-options}@anchor{1de} +@subsubsection Additional command-line options + + +@geindex gccjit;;context;;add_command_line_option (C++ function) +@anchor{cp/topics/contexts _CPPv4N6gccjit7context23add_command_line_optionEPKc}@anchor{1df}@anchor{cp/topics/contexts _CPPv3N6gccjit7context23add_command_line_optionEPKc}@anchor{1e0}@anchor{cp/topics/contexts _CPPv2N6gccjit7context23add_command_line_optionEPKc}@anchor{1e1}@anchor{cp/topics/contexts gccjit context add_command_line_option__cCP}@anchor{1e2} +@deffn {C++ Function} void gccjit::@ref{175,,context}::add_command_line_option (const char *optname) + +Add an arbitrary gcc command-line option to the context for use +when compiling. + +This is a thin wrapper around the C API +@ref{74,,gcc_jit_context_add_command_line_option()}. + +This entrypoint was added in @ref{75,,LIBGCCJIT_ABI_1}; you can test for +its presence using + +@example +#ifdef LIBGCCJIT_HAVE_gcc_jit_context_add_command_line_option +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Objects<2>,Types<2>,Compilation contexts<2>,Topic Reference<2> +@anchor{cp/topics/objects doc}@anchor{1e3}@anchor{cp/topics/objects objects}@anchor{1e4} +@subsection Objects + + +@geindex gccjit;;object (C++ class) +@anchor{cp/topics/objects _CPPv4N6gccjit6objectE}@anchor{17a}@anchor{cp/topics/objects _CPPv3N6gccjit6objectE}@anchor{1e5}@anchor{cp/topics/objects _CPPv2N6gccjit6objectE}@anchor{1e6}@anchor{cp/topics/objects gccjit object}@anchor{1e7} +@deffn {C++ Class} gccjit::object +@end deffn + +Almost every entity in the API (with the exception of +@ref{175,,gccjit;;context} and @ref{16,,gcc_jit_result *}) is a +“contextual” object, a @ref{17a,,gccjit;;object}. + +A JIT object: + +@quotation + + +@itemize * + +@item +is associated with a @ref{175,,gccjit;;context}. + +@item +is automatically cleaned up for you when its context is released so +you don’t need to manually track and cleanup all objects, just the +contexts. +@end itemize +@end quotation + +The C++ class hierarchy within the @code{gccjit} namespace looks like this: + +@example ++- object + +- location + +- type + +- struct + +- field + +- function + +- block + +- rvalue + +- lvalue + +- param + +- case_ +@end example + +The @ref{17a,,gccjit;;object} base class has the following operations: + +@geindex gccjit;;object;;get_context (C++ function) +@anchor{cp/topics/objects _CPPv4NK6gccjit6object11get_contextEv}@anchor{1e8}@anchor{cp/topics/objects _CPPv3NK6gccjit6object11get_contextEv}@anchor{1e9}@anchor{cp/topics/objects _CPPv2NK6gccjit6object11get_contextEv}@anchor{1ea}@anchor{cp/topics/objects gccjit object get_contextC}@anchor{1eb} +@deffn {C++ Function} gccjit::@ref{175,,context} gccjit::@ref{17a,,object}::get_context () const + +Which context is the obj within? +@end deffn + +@geindex gccjit;;object;;get_debug_string (C++ function) +@anchor{cp/topics/objects _CPPv4NK6gccjit6object16get_debug_stringEv}@anchor{17b}@anchor{cp/topics/objects _CPPv3NK6gccjit6object16get_debug_stringEv}@anchor{1ec}@anchor{cp/topics/objects _CPPv2NK6gccjit6object16get_debug_stringEv}@anchor{1ed}@anchor{cp/topics/objects gccjit object get_debug_stringC}@anchor{1ee} +@deffn {C++ Function} std::string gccjit::@ref{17a,,object}::get_debug_string () const + +Generate a human-readable description for the given object. + +For example, + +@example +printf ("obj: %s\n", obj.get_debug_string ().c_str ()); +@end example + +might give this text on stdout: + +@example +obj: 4.0 * (float)i +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Types<2>,Expressions<2>,Objects<2>,Topic Reference<2> +@anchor{cp/topics/types doc}@anchor{1ef}@anchor{cp/topics/types types}@anchor{1f0} +@subsection Types + + +@geindex gccjit;;type (C++ class) +@anchor{cp/topics/types _CPPv4N6gccjit4typeE}@anchor{177}@anchor{cp/topics/types _CPPv3N6gccjit4typeE}@anchor{1f1}@anchor{cp/topics/types _CPPv2N6gccjit4typeE}@anchor{1f2}@anchor{cp/topics/types gccjit type}@anchor{1f3} +@deffn {C++ Class} gccjit::type + +gccjit::type represents a type within the library. It is a subclass +of @ref{17a,,gccjit;;object}. +@end deffn + +Types can be created in several ways: + + +@itemize * + +@item +fundamental types can be accessed using +@ref{178,,gccjit;;context;;get_type()}: + +@example +gccjit::type int_type = ctxt.get_type (GCC_JIT_TYPE_INT); +@end example + +or using the @code{gccjit::context::get_int_type} template: + +@example +gccjit::type t = ctxt.get_int_type (); +@end example + +See @ref{b,,gcc_jit_context_get_type()} for the available types. + +@item +derived types can be accessed by using functions such as +@ref{1f4,,gccjit;;type;;get_pointer()} and @ref{1f5,,gccjit;;type;;get_const()}: + +@example +gccjit::type const_int_star = int_type.get_const ().get_pointer (); +gccjit::type int_const_star = int_type.get_pointer ().get_const (); +@end example + +@item +by creating structures (see below). +@end itemize + +@menu +* Standard types: Standard types<2>. +* Pointers@comma{} const@comma{} and volatile: Pointers const and volatile<2>. +* Vector types: Vector types<2>. +* Structures and unions: Structures and unions<2>. + +@end menu + +@node Standard types<2>,Pointers const and volatile<2>,,Types<2> +@anchor{cp/topics/types standard-types}@anchor{1f6} +@subsubsection Standard types + + +@geindex gccjit;;context;;get_type (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context8get_typeE13gcc_jit_types}@anchor{178}@anchor{cp/topics/types _CPPv3N6gccjit7context8get_typeE13gcc_jit_types}@anchor{1f7}@anchor{cp/topics/types _CPPv2N6gccjit7context8get_typeE13gcc_jit_types}@anchor{1f8}@anchor{cp/topics/types gccjit context get_type__gcc_jit_types}@anchor{1f9} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{175,,context}::get_type (enum gcc_jit_types) + +Access a specific type. This is a thin wrapper around +@ref{b,,gcc_jit_context_get_type()}; the parameter has the same meaning. +@end deffn + +@geindex gccjit;;context;;get_int_type (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context12get_int_typeE6size_ti}@anchor{1fa}@anchor{cp/topics/types _CPPv3N6gccjit7context12get_int_typeE6size_ti}@anchor{1fb}@anchor{cp/topics/types _CPPv2N6gccjit7context12get_int_typeE6size_ti}@anchor{1fc}@anchor{cp/topics/types gccjit context get_int_type__s i}@anchor{1fd} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{175,,context}::get_int_type (size_t num_bytes, int is_signed) + +Access the integer type of the given size. +@end deffn + +@geindex gccjit;;context;;get_int_type (C++ function) +@anchor{cp/topics/types _CPPv4IEN6gccjit7context12get_int_typeI1TEEN6gccjit4typeEv}@anchor{1fe}@anchor{cp/topics/types _CPPv3IEN6gccjit7context12get_int_typeI1TEEv}@anchor{1ff}@anchor{cp/topics/types _CPPv2IEN6gccjit7context12get_int_typeI1TEEv}@anchor{200} +@deffn {C++ Function} template<>gccjit::@ref{177,,type} gccjit::@ref{175,,context}::get_int_type () + +Access the given integer type. For example, you could map the +@code{unsigned short} type into a gccjit::type via: + +@example +gccjit::type t = ctxt.get_int_type (); +@end example +@end deffn + +@node Pointers const and volatile<2>,Vector types<2>,Standard types<2>,Types<2> +@anchor{cp/topics/types pointers-const-and-volatile}@anchor{201} +@subsubsection Pointers, @cite{const}, and @cite{volatile} + + +@geindex gccjit;;type;;get_pointer (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit4type11get_pointerEv}@anchor{1f4}@anchor{cp/topics/types _CPPv3N6gccjit4type11get_pointerEv}@anchor{202}@anchor{cp/topics/types _CPPv2N6gccjit4type11get_pointerEv}@anchor{203}@anchor{cp/topics/types gccjit type get_pointer}@anchor{204} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{177,,type}::get_pointer () + +Given type “T”, get type “T*”. +@end deffn + +@geindex gccjit;;type;;get_const (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit4type9get_constEv}@anchor{1f5}@anchor{cp/topics/types _CPPv3N6gccjit4type9get_constEv}@anchor{205}@anchor{cp/topics/types _CPPv2N6gccjit4type9get_constEv}@anchor{206}@anchor{cp/topics/types gccjit type get_const}@anchor{207} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{177,,type}::get_const () + +Given type “T”, get type “const T”. +@end deffn + +@geindex gccjit;;type;;get_volatile (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit4type12get_volatileEv}@anchor{208}@anchor{cp/topics/types _CPPv3N6gccjit4type12get_volatileEv}@anchor{209}@anchor{cp/topics/types _CPPv2N6gccjit4type12get_volatileEv}@anchor{20a}@anchor{cp/topics/types gccjit type get_volatile}@anchor{20b} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{177,,type}::get_volatile () + +Given type “T”, get type “volatile T”. +@end deffn + +@geindex gccjit;;type;;get_aligned (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit4type11get_alignedE6size_t}@anchor{20c}@anchor{cp/topics/types _CPPv3N6gccjit4type11get_alignedE6size_t}@anchor{20d}@anchor{cp/topics/types _CPPv2N6gccjit4type11get_alignedE6size_t}@anchor{20e}@anchor{cp/topics/types gccjit type get_aligned__s}@anchor{20f} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{177,,type}::get_aligned (size_t alignment_in_bytes) + +Given type “T”, get type: + +@example +T __attribute__ ((aligned (ALIGNMENT_IN_BYTES))) +@end example + +The alignment must be a power of two. +@end deffn + +@geindex gccjit;;context;;new_array_type (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context14new_array_typeEN6gccjit4typeEiN6gccjit8locationE}@anchor{210}@anchor{cp/topics/types _CPPv3N6gccjit7context14new_array_typeEN6gccjit4typeEiN6gccjit8locationE}@anchor{211}@anchor{cp/topics/types _CPPv2N6gccjit7context14new_array_typeEN6gccjit4typeEiN6gccjit8locationE}@anchor{212}@anchor{cp/topics/types gccjit context new_array_type__gccjit type i gccjit location}@anchor{213} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{175,,context}::new_array_type (gccjit::type element_type, int num_elements, gccjit::location loc) + +Given type “T”, get type “T[N]” (for a constant N). +Param “loc” is optional. +@end deffn + +@node Vector types<2>,Structures and unions<2>,Pointers const and volatile<2>,Types<2> +@anchor{cp/topics/types vector-types}@anchor{214} +@subsubsection Vector types + + +@geindex gccjit;;type;;get_vector (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit4type10get_vectorE6size_t}@anchor{215}@anchor{cp/topics/types _CPPv3N6gccjit4type10get_vectorE6size_t}@anchor{216}@anchor{cp/topics/types _CPPv2N6gccjit4type10get_vectorE6size_t}@anchor{217}@anchor{cp/topics/types gccjit type get_vector__s}@anchor{218} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{177,,type}::get_vector (size_t num_units) + +Given type “T”, get type: + +@example +T __attribute__ ((vector_size (sizeof(T) * num_units)) +@end example + +T must be integral or floating point; num_units must be a power of two. +@end deffn + +@node Structures and unions<2>,,Vector types<2>,Types<2> +@anchor{cp/topics/types structures-and-unions}@anchor{219} +@subsubsection Structures and unions + + +@geindex gccjit;;struct_ (C++ class) +@anchor{cp/topics/types _CPPv4N6gccjit7struct_E}@anchor{21a}@anchor{cp/topics/types _CPPv3N6gccjit7struct_E}@anchor{21b}@anchor{cp/topics/types _CPPv2N6gccjit7struct_E}@anchor{21c}@anchor{cp/topics/types gccjit struct_}@anchor{21d} +@deffn {C++ Class} gccjit::struct_ +@end deffn + +A compound type analagous to a C @cite{struct}. + +@ref{21a,,gccjit;;struct_} is a subclass of @ref{177,,gccjit;;type} (and thus +of @ref{17a,,gccjit;;object} in turn). + +@geindex gccjit;;field (C++ class) +@anchor{cp/topics/types _CPPv4N6gccjit5fieldE}@anchor{21e}@anchor{cp/topics/types _CPPv3N6gccjit5fieldE}@anchor{21f}@anchor{cp/topics/types _CPPv2N6gccjit5fieldE}@anchor{220}@anchor{cp/topics/types gccjit field}@anchor{221} +@deffn {C++ Class} gccjit::field +@end deffn + +A field within a @ref{21a,,gccjit;;struct_}. + +@ref{21e,,gccjit;;field} is a subclass of @ref{17a,,gccjit;;object}. + +You can model C @cite{struct} types by creating @ref{21a,,gccjit;;struct_} and +@ref{21e,,gccjit;;field} instances, in either order: + + +@itemize * + +@item +by creating the fields, then the structure. For example, to model: + +@example +struct coord @{double x; double y; @}; +@end example + +you could call: + +@example +gccjit::field field_x = ctxt.new_field (double_type, "x"); +gccjit::field field_y = ctxt.new_field (double_type, "y"); +std::vector fields; +fields.push_back (field_x); +fields.push_back (field_y); +gccjit::struct_ coord = ctxt.new_struct_type ("coord", fields); +@end example + +@item +by creating the structure, then populating it with fields, typically +to allow modelling self-referential structs such as: + +@example +struct node @{ int m_hash; struct node *m_next; @}; +@end example + +like this: + +@example +gccjit::struct_ node = ctxt.new_opaque_struct_type ("node"); +gccjit::type node_ptr = node.get_pointer (); +gccjit::field field_hash = ctxt.new_field (int_type, "m_hash"); +gccjit::field field_next = ctxt.new_field (node_ptr, "m_next"); +std::vector fields; +fields.push_back (field_hash); +fields.push_back (field_next); +node.set_fields (fields); +@end example +@end itemize + +@c FIXME: the above API doesn't seem to exist yet + +@geindex gccjit;;context;;new_field (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context9new_fieldEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{222}@anchor{cp/topics/types _CPPv3N6gccjit7context9new_fieldEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{223}@anchor{cp/topics/types _CPPv2N6gccjit7context9new_fieldEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{224}@anchor{cp/topics/types gccjit context new_field__gccjit type cCP gccjit location}@anchor{225} +@deffn {C++ Function} gccjit::@ref{21e,,field} gccjit::@ref{175,,context}::new_field (gccjit::type type, const char *name, gccjit::location loc) + +Construct a new field, with the given type and name. +@end deffn + +@geindex gccjit;;context;;new_struct_type (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context15new_struct_typeERKNSt6stringERNSt6vectorI5fieldEEN6gccjit8locationE}@anchor{226}@anchor{cp/topics/types _CPPv3N6gccjit7context15new_struct_typeERKNSt6stringERNSt6vectorI5fieldEEN6gccjit8locationE}@anchor{227}@anchor{cp/topics/types _CPPv2N6gccjit7context15new_struct_typeERKNSt6stringERNSt6vectorI5fieldEEN6gccjit8locationE}@anchor{228}@anchor{cp/topics/types gccjit context new_struct_type__ssCR std vector field R gccjit location}@anchor{229} +@deffn {C++ Function} gccjit::@ref{21a,,struct_} gccjit::@ref{175,,context}::new_struct_type (const std::string &name, std::vector &fields, gccjit::location loc) + +@quotation + +Construct a new struct type, with the given name and fields. +@end quotation +@end deffn + +@geindex gccjit;;context;;new_opaque_struct (C++ function) +@anchor{cp/topics/types _CPPv4N6gccjit7context17new_opaque_structERKNSt6stringEN6gccjit8locationE}@anchor{22a}@anchor{cp/topics/types _CPPv3N6gccjit7context17new_opaque_structERKNSt6stringEN6gccjit8locationE}@anchor{22b}@anchor{cp/topics/types _CPPv2N6gccjit7context17new_opaque_structERKNSt6stringEN6gccjit8locationE}@anchor{22c}@anchor{cp/topics/types gccjit context new_opaque_struct__ssCR gccjit location}@anchor{22d} +@deffn {C++ Function} gccjit::@ref{21a,,struct_} gccjit::@ref{175,,context}::new_opaque_struct (const std::string &name, gccjit::location loc) + +Construct a new struct type, with the given name, but without +specifying the fields. The fields can be omitted (in which case the +size of the struct is not known), or later specified using +@ref{93,,gcc_jit_struct_set_fields()}. +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Expressions<2>,Creating and using functions<2>,Types<2>,Topic Reference<2> +@anchor{cp/topics/expressions doc}@anchor{22e}@anchor{cp/topics/expressions expressions}@anchor{22f} +@subsection Expressions + + +@menu +* Rvalues: Rvalues<2>. +* Lvalues: Lvalues<2>. +* Working with pointers@comma{} structs and unions: Working with pointers structs and unions<2>. + +@end menu + +@node Rvalues<2>,Lvalues<2>,,Expressions<2> +@anchor{cp/topics/expressions rvalues}@anchor{230} +@subsubsection Rvalues + + +@geindex gccjit;;rvalue (C++ class) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvalueE}@anchor{17e}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvalueE}@anchor{231}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvalueE}@anchor{232}@anchor{cp/topics/expressions gccjit rvalue}@anchor{233} +@deffn {C++ Class} gccjit::rvalue +@end deffn + +A @ref{17e,,gccjit;;rvalue} is an expression that can be computed. It is a +subclass of @ref{17a,,gccjit;;object}, and is a thin wrapper around +@ref{13,,gcc_jit_rvalue *} from the C API. + +It can be simple, e.g.: + +@quotation + + +@itemize * + +@item +an integer value e.g. @cite{0} or @cite{42} + +@item +a string literal e.g. @cite{“Hello world”} + +@item +a variable e.g. @cite{i}. These are also lvalues (see below). +@end itemize +@end quotation + +or compound e.g.: + +@quotation + + +@itemize * + +@item +a unary expression e.g. @cite{!cond} + +@item +a binary expression e.g. @cite{(a + b)} + +@item +a function call e.g. @cite{get_distance (&player_ship@comma{} &target)} + +@item +etc. +@end itemize +@end quotation + +Every rvalue has an associated type, and the API will check to ensure +that types match up correctly (otherwise the context will emit an error). + +@geindex gccjit;;rvalue;;get_type (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvalue8get_typeEv}@anchor{234}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvalue8get_typeEv}@anchor{235}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvalue8get_typeEv}@anchor{236}@anchor{cp/topics/expressions gccjit rvalue get_type}@anchor{237} +@deffn {C++ Function} gccjit::@ref{177,,type} gccjit::@ref{17e,,rvalue}::get_type () + +Get the type of this rvalue. +@end deffn + +@menu +* Simple expressions: Simple expressions<2>. +* Vector expressions: Vector expressions<2>. +* Unary Operations: Unary Operations<2>. +* Binary Operations: Binary Operations<2>. +* Comparisons: Comparisons<2>. +* Function calls: Function calls<2>. +* Function pointers: Function pointers<3>. +* Type-coercion: Type-coercion<2>. + +@end menu + +@node Simple expressions<2>,Vector expressions<2>,,Rvalues<2> +@anchor{cp/topics/expressions simple-expressions}@anchor{238} +@subsubsection Simple expressions + + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueEN6gccjit4typeEi}@anchor{192}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueEN6gccjit4typeEi}@anchor{239}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueEN6gccjit4typeEi}@anchor{23a}@anchor{cp/topics/expressions gccjit context new_rvalue__gccjit type iC}@anchor{23b} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (gccjit::type numeric_type, int value) const + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{int} value. +@end deffn + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueEN6gccjit4typeEl}@anchor{23c}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueEN6gccjit4typeEl}@anchor{23d}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueEN6gccjit4typeEl}@anchor{23e}@anchor{cp/topics/expressions gccjit context new_rvalue__gccjit type lC}@anchor{23f} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (gccjit::type numeric_type, long value) const + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{long} value. +@end deffn + +@geindex gccjit;;context;;zero (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context4zeroEN6gccjit4typeE}@anchor{18e}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context4zeroEN6gccjit4typeE}@anchor{240}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context4zeroEN6gccjit4typeE}@anchor{241}@anchor{cp/topics/expressions gccjit context zero__gccjit typeC}@anchor{242} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::zero (gccjit::type numeric_type) const + +Given a numeric type (integer or floating point), get the rvalue for +zero. Essentially this is just a shortcut for: + +@example +ctxt.new_rvalue (numeric_type, 0) +@end example +@end deffn + +@geindex gccjit;;context;;one (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context3oneEN6gccjit4typeE}@anchor{243}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context3oneEN6gccjit4typeE}@anchor{244}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context3oneEN6gccjit4typeE}@anchor{245}@anchor{cp/topics/expressions gccjit context one__gccjit typeC}@anchor{246} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::one (gccjit::type numeric_type) const + +Given a numeric type (integer or floating point), get the rvalue for +one. Essentially this is just a shortcut for: + +@example +ctxt.new_rvalue (numeric_type, 1) +@end example +@end deffn + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueEN6gccjit4typeEd}@anchor{247}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueEN6gccjit4typeEd}@anchor{248}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueEN6gccjit4typeEd}@anchor{249}@anchor{cp/topics/expressions gccjit context new_rvalue__gccjit type doubleC}@anchor{24a} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (gccjit::type numeric_type, double value) const + +Given a numeric type (integer or floating point), build an rvalue for +the given constant @code{double} value. +@end deffn + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueEN6gccjit4typeEPv}@anchor{24b}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueEN6gccjit4typeEPv}@anchor{24c}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueEN6gccjit4typeEPv}@anchor{24d}@anchor{cp/topics/expressions gccjit context new_rvalue__gccjit type voidPC}@anchor{24e} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (gccjit::type pointer_type, void *value) const + +Given a pointer type, build an rvalue for the given address. +@end deffn + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueERKNSt6stringE}@anchor{24f}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueERKNSt6stringE}@anchor{250}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueERKNSt6stringE}@anchor{251}@anchor{cp/topics/expressions gccjit context new_rvalue__ssCRC}@anchor{252} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (const std::string &value) const + +Generate an rvalue of type @code{GCC_JIT_TYPE_CONST_CHAR_PTR} for +the given string. This is akin to a string literal. +@end deffn + +@node Vector expressions<2>,Unary Operations<2>,Simple expressions<2>,Rvalues<2> +@anchor{cp/topics/expressions vector-expressions}@anchor{253} +@subsubsection Vector expressions + + +@geindex gccjit;;context;;new_rvalue (C++ function) +@anchor{cp/topics/expressions _CPPv4NK6gccjit7context10new_rvalueEN6gccjit4typeENSt6vectorIN6gccjit6rvalueEEE}@anchor{254}@anchor{cp/topics/expressions _CPPv3NK6gccjit7context10new_rvalueEN6gccjit4typeENSt6vectorIN6gccjit6rvalueEEE}@anchor{255}@anchor{cp/topics/expressions _CPPv2NK6gccjit7context10new_rvalueEN6gccjit4typeENSt6vectorIN6gccjit6rvalueEEE}@anchor{256}@anchor{cp/topics/expressions gccjit context new_rvalue__gccjit type std vector gccjit rvalue C}@anchor{257} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_rvalue (gccjit::type vector_type, std::vector elements) const + +Given a vector type, and a vector of scalar rvalue elements, generate a +vector rvalue. + +The number of elements needs to match that of the vector type. +@end deffn + +@node Unary Operations<2>,Binary Operations<2>,Vector expressions<2>,Rvalues<2> +@anchor{cp/topics/expressions unary-operations}@anchor{258} +@subsubsection Unary Operations + + +@geindex gccjit;;context;;new_unary_op (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context12new_unary_opE16gcc_jit_unary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{259}@anchor{cp/topics/expressions _CPPv3N6gccjit7context12new_unary_opE16gcc_jit_unary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{25a}@anchor{cp/topics/expressions _CPPv2N6gccjit7context12new_unary_opE16gcc_jit_unary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{25b}@anchor{cp/topics/expressions gccjit context new_unary_op__gcc_jit_unary_op gccjit type gccjit rvalue gccjit location}@anchor{25c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_unary_op (enum gcc_jit_unary_op, gccjit::type result_type, gccjit::rvalue rvalue, gccjit::location loc) + +Build a unary operation out of an input rvalue. + +Parameter @code{loc} is optional. + +This is a thin wrapper around the C API’s +@ref{bf,,gcc_jit_context_new_unary_op()} and the available unary +operations are documented there. +@end deffn + +There are shorter ways to spell the various specific kinds of unary +operation: + +@geindex gccjit;;context;;new_minus (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{25d}@anchor{cp/topics/expressions _CPPv3N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{25e}@anchor{cp/topics/expressions _CPPv2N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{25f}@anchor{cp/topics/expressions gccjit context new_minus__gccjit type gccjit rvalue gccjit location}@anchor{260} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_minus (gccjit::type result_type, gccjit::rvalue a, gccjit::location loc) + +Negate an arithmetic value; for example: + +@example +gccjit::rvalue negpi = ctxt.new_minus (t_double, pi); +@end example + +builds the equivalent of this C expression: + +@example +-pi +@end example +@end deffn + +@geindex new_bitwise_negate (C++ function) +@anchor{cp/topics/expressions _CPPv418new_bitwise_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{261}@anchor{cp/topics/expressions _CPPv318new_bitwise_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{262}@anchor{cp/topics/expressions _CPPv218new_bitwise_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{263}@anchor{cp/topics/expressions new_bitwise_negate__gccjit type gccjit rvalue gccjit location}@anchor{264} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} new_bitwise_negate (gccjit::type result_type, gccjit::rvalue a, gccjit::location loc) + +Bitwise negation of an integer value (one’s complement); for example: + +@example +gccjit::rvalue mask = ctxt.new_bitwise_negate (t_int, a); +@end example + +builds the equivalent of this C expression: + +@example +~a +@end example +@end deffn + +@geindex new_logical_negate (C++ function) +@anchor{cp/topics/expressions _CPPv418new_logical_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{265}@anchor{cp/topics/expressions _CPPv318new_logical_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{266}@anchor{cp/topics/expressions _CPPv218new_logical_negateN6gccjit4typeEN6gccjit6rvalueEN6gccjit8locationE}@anchor{267}@anchor{cp/topics/expressions new_logical_negate__gccjit type gccjit rvalue gccjit location}@anchor{268} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} new_logical_negate (gccjit::type result_type, gccjit::rvalue a, gccjit::location loc) + +Logical negation of an arithmetic or pointer value; for example: + +@example +gccjit::rvalue guard = ctxt.new_logical_negate (t_bool, cond); +@end example + +builds the equivalent of this C expression: + +@example +!cond +@end example +@end deffn + +The most concise way to spell them is with overloaded operators: + +@geindex operator- (C++ function) +@anchor{cp/topics/expressions _CPPv4miN6gccjit6rvalueE}@anchor{269}@anchor{cp/topics/expressions _CPPv3miN6gccjit6rvalueE}@anchor{26a}@anchor{cp/topics/expressions _CPPv2miN6gccjit6rvalueE}@anchor{26b}@anchor{cp/topics/expressions sub-operator__gccjit rvalue}@anchor{26c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator@w{-} (gccjit::rvalue a) + +@example +gccjit::rvalue negpi = -pi; +@end example +@end deffn + +@geindex operator~ (C++ function) +@anchor{cp/topics/expressions _CPPv4coN6gccjit6rvalueE}@anchor{26d}@anchor{cp/topics/expressions _CPPv3coN6gccjit6rvalueE}@anchor{26e}@anchor{cp/topics/expressions _CPPv2coN6gccjit6rvalueE}@anchor{26f}@anchor{cp/topics/expressions inv-operator__gccjit rvalue}@anchor{270} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator~ (gccjit::rvalue a) + +@example +gccjit::rvalue mask = ~a; +@end example +@end deffn + +@geindex operator! (C++ function) +@anchor{cp/topics/expressions _CPPv4ntN6gccjit6rvalueE}@anchor{271}@anchor{cp/topics/expressions _CPPv3ntN6gccjit6rvalueE}@anchor{272}@anchor{cp/topics/expressions _CPPv2ntN6gccjit6rvalueE}@anchor{273}@anchor{cp/topics/expressions not-operator__gccjit rvalue}@anchor{274} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator! (gccjit::rvalue a) + +@example +gccjit::rvalue guard = !cond; +@end example +@end deffn + +@node Binary Operations<2>,Comparisons<2>,Unary Operations<2>,Rvalues<2> +@anchor{cp/topics/expressions binary-operations}@anchor{275} +@subsubsection Binary Operations + + +@geindex gccjit;;context;;new_binary_op (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context13new_binary_opE17gcc_jit_binary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{17d}@anchor{cp/topics/expressions _CPPv3N6gccjit7context13new_binary_opE17gcc_jit_binary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{276}@anchor{cp/topics/expressions _CPPv2N6gccjit7context13new_binary_opE17gcc_jit_binary_opN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{277}@anchor{cp/topics/expressions gccjit context new_binary_op__gcc_jit_binary_op gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{278} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_binary_op (enum gcc_jit_binary_op, gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) + +Build a binary operation out of two constituent rvalues. + +Parameter @code{loc} is optional. + +This is a thin wrapper around the C API’s +@ref{12,,gcc_jit_context_new_binary_op()} and the available binary +operations are documented there. +@end deffn + +There are shorter ways to spell the various specific kinds of binary +operation: + +@geindex gccjit;;context;;new_plus (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context8new_plusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{279}@anchor{cp/topics/expressions _CPPv3N6gccjit7context8new_plusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{27a}@anchor{cp/topics/expressions _CPPv2N6gccjit7context8new_plusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{27b}@anchor{cp/topics/expressions gccjit context new_plus__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{27c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_plus (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_minus (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{27d}@anchor{cp/topics/expressions _CPPv3N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{27e}@anchor{cp/topics/expressions _CPPv2N6gccjit7context9new_minusEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{27f}@anchor{cp/topics/expressions gccjit context new_minus__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{280} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_minus (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_mult (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context8new_multEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{281}@anchor{cp/topics/expressions _CPPv3N6gccjit7context8new_multEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{282}@anchor{cp/topics/expressions _CPPv2N6gccjit7context8new_multEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{283}@anchor{cp/topics/expressions gccjit context new_mult__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{284} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_mult (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_divide (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context10new_divideEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{285}@anchor{cp/topics/expressions _CPPv3N6gccjit7context10new_divideEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{286}@anchor{cp/topics/expressions _CPPv2N6gccjit7context10new_divideEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{287}@anchor{cp/topics/expressions gccjit context new_divide__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{288} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_divide (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_modulo (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context10new_moduloEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{289}@anchor{cp/topics/expressions _CPPv3N6gccjit7context10new_moduloEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{28a}@anchor{cp/topics/expressions _CPPv2N6gccjit7context10new_moduloEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{28b}@anchor{cp/topics/expressions gccjit context new_modulo__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{28c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_modulo (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_bitwise_and (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context15new_bitwise_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{28d}@anchor{cp/topics/expressions _CPPv3N6gccjit7context15new_bitwise_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{28e}@anchor{cp/topics/expressions _CPPv2N6gccjit7context15new_bitwise_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{28f}@anchor{cp/topics/expressions gccjit context new_bitwise_and__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{290} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_bitwise_and (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_bitwise_xor (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context15new_bitwise_xorEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{291}@anchor{cp/topics/expressions _CPPv3N6gccjit7context15new_bitwise_xorEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{292}@anchor{cp/topics/expressions _CPPv2N6gccjit7context15new_bitwise_xorEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{293}@anchor{cp/topics/expressions gccjit context new_bitwise_xor__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{294} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_bitwise_xor (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_bitwise_or (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context14new_bitwise_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{295}@anchor{cp/topics/expressions _CPPv3N6gccjit7context14new_bitwise_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{296}@anchor{cp/topics/expressions _CPPv2N6gccjit7context14new_bitwise_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{297}@anchor{cp/topics/expressions gccjit context new_bitwise_or__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{298} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_bitwise_or (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_logical_and (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context15new_logical_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{299}@anchor{cp/topics/expressions _CPPv3N6gccjit7context15new_logical_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{29a}@anchor{cp/topics/expressions _CPPv2N6gccjit7context15new_logical_andEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{29b}@anchor{cp/topics/expressions gccjit context new_logical_and__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{29c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_logical_and (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_logical_or (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context14new_logical_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{29d}@anchor{cp/topics/expressions _CPPv3N6gccjit7context14new_logical_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{29e}@anchor{cp/topics/expressions _CPPv2N6gccjit7context14new_logical_orEN6gccjit4typeEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{29f}@anchor{cp/topics/expressions gccjit context new_logical_or__gccjit type gccjit rvalue gccjit rvalue gccjit location}@anchor{2a0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_logical_or (gccjit::type result_type, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +The most concise way to spell them is with overloaded operators: + +@geindex operator+ (C++ function) +@anchor{cp/topics/expressions _CPPv4plN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a1}@anchor{cp/topics/expressions _CPPv3plN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a2}@anchor{cp/topics/expressions _CPPv2plN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a3}@anchor{cp/topics/expressions add-operator__gccjit rvalue gccjit rvalue}@anchor{2a4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator+ (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue sum = a + b; +@end example +@end deffn + +@geindex operator- (C++ function) +@anchor{cp/topics/expressions _CPPv4miN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a5}@anchor{cp/topics/expressions _CPPv3miN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a6}@anchor{cp/topics/expressions _CPPv2miN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a7}@anchor{cp/topics/expressions sub-operator__gccjit rvalue gccjit rvalue}@anchor{2a8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator@w{-} (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue diff = a - b; +@end example +@end deffn + +@geindex operator* (C++ function) +@anchor{cp/topics/expressions _CPPv4mlN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2a9}@anchor{cp/topics/expressions _CPPv3mlN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2aa}@anchor{cp/topics/expressions _CPPv2mlN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ab}@anchor{cp/topics/expressions mul-operator__gccjit rvalue gccjit rvalue}@anchor{2ac} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator* (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue prod = a * b; +@end example +@end deffn + +@geindex operator/ (C++ function) +@anchor{cp/topics/expressions _CPPv4dvN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ad}@anchor{cp/topics/expressions _CPPv3dvN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ae}@anchor{cp/topics/expressions _CPPv2dvN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2af}@anchor{cp/topics/expressions div-operator__gccjit rvalue gccjit rvalue}@anchor{2b0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator/ (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue result = a / b; +@end example +@end deffn + +@geindex operator% (C++ function) +@anchor{cp/topics/expressions _CPPv4rmN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b1}@anchor{cp/topics/expressions _CPPv3rmN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b2}@anchor{cp/topics/expressions _CPPv2rmN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b3}@anchor{cp/topics/expressions mod-operator__gccjit rvalue gccjit rvalue}@anchor{2b4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator% (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue mod = a % b; +@end example +@end deffn + +@geindex operator& (C++ function) +@anchor{cp/topics/expressions _CPPv4anN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b5}@anchor{cp/topics/expressions _CPPv3anN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b6}@anchor{cp/topics/expressions _CPPv2anN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b7}@anchor{cp/topics/expressions and-operator__gccjit rvalue gccjit rvalue}@anchor{2b8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator& (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue x = a & b; +@end example +@end deffn + +@geindex operator^ (C++ function) +@anchor{cp/topics/expressions _CPPv4eoN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2b9}@anchor{cp/topics/expressions _CPPv3eoN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ba}@anchor{cp/topics/expressions _CPPv2eoN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2bb}@anchor{cp/topics/expressions xor-operator__gccjit rvalue gccjit rvalue}@anchor{2bc} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator^ (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue x = a ^ b; +@end example +@end deffn + +@geindex operator| (C++ function) +@anchor{cp/topics/expressions _CPPv4orN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2bd}@anchor{cp/topics/expressions _CPPv3orN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2be}@anchor{cp/topics/expressions _CPPv2orN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2bf}@anchor{cp/topics/expressions or-operator__gccjit rvalue gccjit rvalue}@anchor{2c0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator| (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue x = a | b; +@end example +@end deffn + +@geindex operator&& (C++ function) +@anchor{cp/topics/expressions _CPPv4aaN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c1}@anchor{cp/topics/expressions _CPPv3aaN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c2}@anchor{cp/topics/expressions _CPPv2aaN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c3}@anchor{cp/topics/expressions sand-operator__gccjit rvalue gccjit rvalue}@anchor{2c4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator&& (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = a && b; +@end example +@end deffn + +@geindex operator|| (C++ function) +@anchor{cp/topics/expressions _CPPv4ooN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c5}@anchor{cp/topics/expressions _CPPv3ooN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c6}@anchor{cp/topics/expressions _CPPv2ooN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2c7}@anchor{cp/topics/expressions sor-operator__gccjit rvalue gccjit rvalue}@anchor{2c8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator|| (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = a || b; +@end example +@end deffn + +These can of course be combined, giving a terse way to build compound +expressions: + +@quotation + +@example +gccjit::rvalue discriminant = (b * b) - (four * a * c); +@end example +@end quotation + +@node Comparisons<2>,Function calls<2>,Binary Operations<2>,Rvalues<2> +@anchor{cp/topics/expressions comparisons}@anchor{2c9} +@subsubsection Comparisons + + +@geindex gccjit;;context;;new_comparison (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context14new_comparisonE18gcc_jit_comparisonN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{18f}@anchor{cp/topics/expressions _CPPv3N6gccjit7context14new_comparisonE18gcc_jit_comparisonN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2ca}@anchor{cp/topics/expressions _CPPv2N6gccjit7context14new_comparisonE18gcc_jit_comparisonN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2cb}@anchor{cp/topics/expressions gccjit context new_comparison__gcc_jit_comparison gccjit rvalue gccjit rvalue gccjit location}@anchor{2cc} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_comparison (enum gcc_jit_comparison, gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) + +Build a boolean rvalue out of the comparison of two other rvalues. + +Parameter @code{loc} is optional. + +This is a thin wrapper around the C API’s +@ref{2c,,gcc_jit_context_new_comparison()} and the available kinds +of comparison are documented there. +@end deffn + +There are shorter ways to spell the various specific kinds of binary +operation: + +@geindex gccjit;;context;;new_eq (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_eqEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2cd}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_eqEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2ce}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_eqEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2cf}@anchor{cp/topics/expressions gccjit context new_eq__gccjit rvalue gccjit rvalue gccjit location}@anchor{2d0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_eq (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_ne (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_neEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d1}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_neEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d2}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_neEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d3}@anchor{cp/topics/expressions gccjit context new_ne__gccjit rvalue gccjit rvalue gccjit location}@anchor{2d4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_ne (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_lt (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_ltEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d5}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_ltEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d6}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_ltEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d7}@anchor{cp/topics/expressions gccjit context new_lt__gccjit rvalue gccjit rvalue gccjit location}@anchor{2d8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_lt (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_le (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_leEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2d9}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_leEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2da}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_leEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2db}@anchor{cp/topics/expressions gccjit context new_le__gccjit rvalue gccjit rvalue gccjit location}@anchor{2dc} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_le (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_gt (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_gtEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2dd}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_gtEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2de}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_gtEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2df}@anchor{cp/topics/expressions gccjit context new_gt__gccjit rvalue gccjit rvalue gccjit location}@anchor{2e0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_gt (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +@geindex gccjit;;context;;new_ge (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context6new_geEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2e1}@anchor{cp/topics/expressions _CPPv3N6gccjit7context6new_geEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2e2}@anchor{cp/topics/expressions _CPPv2N6gccjit7context6new_geEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{2e3}@anchor{cp/topics/expressions gccjit context new_ge__gccjit rvalue gccjit rvalue gccjit location}@anchor{2e4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_ge (gccjit::rvalue a, gccjit::rvalue b, gccjit::location loc) +@end deffn + +The most concise way to spell them is with overloaded operators: + +@geindex operator== (C++ function) +@anchor{cp/topics/expressions _CPPv4eqN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2e5}@anchor{cp/topics/expressions _CPPv3eqN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2e6}@anchor{cp/topics/expressions _CPPv2eqN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2e7}@anchor{cp/topics/expressions eq-operator__gccjit rvalue gccjit rvalue}@anchor{2e8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator== (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = (a == ctxt.zero (t_int)); +@end example +@end deffn + +@geindex operator!= (C++ function) +@anchor{cp/topics/expressions _CPPv4neN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2e9}@anchor{cp/topics/expressions _CPPv3neN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ea}@anchor{cp/topics/expressions _CPPv2neN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2eb}@anchor{cp/topics/expressions neq-operator__gccjit rvalue gccjit rvalue}@anchor{2ec} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator!= (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = (i != j); +@end example +@end deffn + +@geindex operator< (C++ function) +@anchor{cp/topics/expressions _CPPv4ltN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ed}@anchor{cp/topics/expressions _CPPv3ltN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ee}@anchor{cp/topics/expressions _CPPv2ltN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2ef}@anchor{cp/topics/expressions lt-operator__gccjit rvalue gccjit rvalue}@anchor{2f0} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator< (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = i < n; +@end example +@end deffn + +@geindex operator<= (C++ function) +@anchor{cp/topics/expressions _CPPv4leN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f1}@anchor{cp/topics/expressions _CPPv3leN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f2}@anchor{cp/topics/expressions _CPPv2leN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f3}@anchor{cp/topics/expressions lte-operator__gccjit rvalue gccjit rvalue}@anchor{2f4} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator<= (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = i <= n; +@end example +@end deffn + +@geindex operator> (C++ function) +@anchor{cp/topics/expressions _CPPv4gtN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f5}@anchor{cp/topics/expressions _CPPv3gtN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f6}@anchor{cp/topics/expressions _CPPv2gtN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f7}@anchor{cp/topics/expressions gt-operator__gccjit rvalue gccjit rvalue}@anchor{2f8} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator> (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = (ch > limit); +@end example +@end deffn + +@geindex operator>= (C++ function) +@anchor{cp/topics/expressions _CPPv4geN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2f9}@anchor{cp/topics/expressions _CPPv3geN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2fa}@anchor{cp/topics/expressions _CPPv2geN6gccjit6rvalueEN6gccjit6rvalueE}@anchor{2fb}@anchor{cp/topics/expressions gte-operator__gccjit rvalue gccjit rvalue}@anchor{2fc} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} operator>= (gccjit::rvalue a, gccjit::rvalue b) + +@example +gccjit::rvalue cond = (score >= ctxt.new_rvalue (t_int, 100)); +@end example +@end deffn + +@c TODO: beyond this point + +@node Function calls<2>,Function pointers<3>,Comparisons<2>,Rvalues<2> +@anchor{cp/topics/expressions function-calls}@anchor{2fd} +@subsubsection Function calls + + +@geindex gcc_jit_context_new_call (C++ function) +@anchor{cp/topics/expressions _CPPv424gcc_jit_context_new_callP15gcc_jit_contextP16gcc_jit_locationP16gcc_jit_functioniPP14gcc_jit_rvalue}@anchor{2fe}@anchor{cp/topics/expressions _CPPv324gcc_jit_context_new_callP15gcc_jit_contextP16gcc_jit_locationP16gcc_jit_functioniPP14gcc_jit_rvalue}@anchor{2ff}@anchor{cp/topics/expressions _CPPv224gcc_jit_context_new_callP15gcc_jit_contextP16gcc_jit_locationP16gcc_jit_functioniPP14gcc_jit_rvalue}@anchor{300}@anchor{cp/topics/expressions gcc_jit_context_new_call__gcc_jit_contextP gcc_jit_locationP gcc_jit_functionP i gcc_jit_rvaluePP}@anchor{301} +@deffn {C++ Function} gcc_jit_rvalue *gcc_jit_context_new_call (gcc_jit_context *ctxt, gcc_jit_location *loc, gcc_jit_function *func, int numargs, gcc_jit_rvalue **args) + +Given a function and the given table of argument rvalues, construct a +call to the function, with the result as an rvalue. + +@cartouche +@quotation Note +@code{gccjit::context::new_call()} merely builds a +@ref{17e,,gccjit;;rvalue} i.e. an expression that can be evaluated, +perhaps as part of a more complicated expression. +The call @emph{won’t} happen unless you add a statement to a function +that evaluates the expression. + +For example, if you want to call a function and discard the result +(or to call a function with @code{void} return type), use +@ref{302,,gccjit;;block;;add_eval()}: + +@example +/* Add "(void)printf (arg0, arg1);". */ +block.add_eval (ctxt.new_call (printf_func, arg0, arg1)); +@end example +@end quotation +@end cartouche +@end deffn + +@node Function pointers<3>,Type-coercion<2>,Function calls<2>,Rvalues<2> +@anchor{cp/topics/expressions function-pointers}@anchor{303} +@subsubsection Function pointers + + +@geindex gccjit;;function;;get_address (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit8function11get_addressEN6gccjit8locationE}@anchor{304}@anchor{cp/topics/expressions _CPPv3N6gccjit8function11get_addressEN6gccjit8locationE}@anchor{305}@anchor{cp/topics/expressions _CPPv2N6gccjit8function11get_addressEN6gccjit8locationE}@anchor{306}@anchor{cp/topics/expressions gccjit function get_address__gccjit location}@anchor{307} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{18c,,function}::get_address (gccjit::location loc) + +Get the address of a function as an rvalue, of function pointer +type. +@end deffn + +@node Type-coercion<2>,,Function pointers<3>,Rvalues<2> +@anchor{cp/topics/expressions type-coercion}@anchor{308} +@subsubsection Type-coercion + + +@geindex gccjit;;context;;new_cast (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context8new_castEN6gccjit6rvalueEN6gccjit4typeEN6gccjit8locationE}@anchor{309}@anchor{cp/topics/expressions _CPPv3N6gccjit7context8new_castEN6gccjit6rvalueEN6gccjit4typeEN6gccjit8locationE}@anchor{30a}@anchor{cp/topics/expressions _CPPv2N6gccjit7context8new_castEN6gccjit6rvalueEN6gccjit4typeEN6gccjit8locationE}@anchor{30b}@anchor{cp/topics/expressions gccjit context new_cast__gccjit rvalue gccjit type gccjit location}@anchor{30c} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{175,,context}::new_cast (gccjit::rvalue rvalue, gccjit::type type, gccjit::location loc) + +Given an rvalue of T, construct another rvalue of another type. + +Currently only a limited set of conversions are possible: + +@quotation + + +@itemize * + +@item +int <-> float + +@item +int <-> bool + +@item +P* <-> Q*, for pointer types P and Q +@end itemize +@end quotation +@end deffn + +@node Lvalues<2>,Working with pointers structs and unions<2>,Rvalues<2>,Expressions<2> +@anchor{cp/topics/expressions lvalues}@anchor{30d} +@subsubsection Lvalues + + +@geindex gccjit;;lvalue (C++ class) +@anchor{cp/topics/expressions _CPPv4N6gccjit6lvalueE}@anchor{187}@anchor{cp/topics/expressions _CPPv3N6gccjit6lvalueE}@anchor{30e}@anchor{cp/topics/expressions _CPPv2N6gccjit6lvalueE}@anchor{30f}@anchor{cp/topics/expressions gccjit lvalue}@anchor{310} +@deffn {C++ Class} gccjit::lvalue +@end deffn + +An lvalue is something that can of the @emph{left}-hand side of an assignment: +a storage area (such as a variable). It is a subclass of +@ref{17e,,gccjit;;rvalue}, where the rvalue is computed by reading from the +storage area. + +It iss a thin wrapper around @ref{24,,gcc_jit_lvalue *} from the C API. + +@geindex gccjit;;lvalue;;get_address (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6lvalue11get_addressEN6gccjit8locationE}@anchor{311}@anchor{cp/topics/expressions _CPPv3N6gccjit6lvalue11get_addressEN6gccjit8locationE}@anchor{312}@anchor{cp/topics/expressions _CPPv2N6gccjit6lvalue11get_addressEN6gccjit8locationE}@anchor{313}@anchor{cp/topics/expressions gccjit lvalue get_address__gccjit location}@anchor{314} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{187,,lvalue}::get_address (gccjit::location loc) + +Take the address of an lvalue; analogous to: + +@example +&(EXPR) +@end example + +in C. + +Parameter “loc” is optional. +@end deffn + +@menu +* Global variables: Global variables<2>. + +@end menu + +@node Global variables<2>,,,Lvalues<2> +@anchor{cp/topics/expressions global-variables}@anchor{315} +@subsubsection Global variables + + +@geindex gccjit;;context;;new_global (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context10new_globalE19gcc_jit_global_kindN6gccjit4typeEPKcN6gccjit8locationE}@anchor{316}@anchor{cp/topics/expressions _CPPv3N6gccjit7context10new_globalE19gcc_jit_global_kindN6gccjit4typeEPKcN6gccjit8locationE}@anchor{317}@anchor{cp/topics/expressions _CPPv2N6gccjit7context10new_globalE19gcc_jit_global_kindN6gccjit4typeEPKcN6gccjit8locationE}@anchor{318}@anchor{cp/topics/expressions gccjit context new_global__gcc_jit_global_kind gccjit type cCP gccjit location}@anchor{319} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{175,,context}::new_global (enum gcc_jit_global_kind, gccjit::type type, const char *name, gccjit::location loc) + +Add a new global variable of the given type and name to the context. + +This is a thin wrapper around @ref{f5,,gcc_jit_context_new_global()} from +the C API; the “kind” parameter has the same meaning as there. +@end deffn + +@node Working with pointers structs and unions<2>,,Lvalues<2>,Expressions<2> +@anchor{cp/topics/expressions working-with-pointers-structs-and-unions}@anchor{31a} +@subsubsection Working with pointers, structs and unions + + +@geindex gccjit;;rvalue;;dereference (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvalue11dereferenceEN6gccjit8locationE}@anchor{31b}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvalue11dereferenceEN6gccjit8locationE}@anchor{31c}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvalue11dereferenceEN6gccjit8locationE}@anchor{31d}@anchor{cp/topics/expressions gccjit rvalue dereference__gccjit location}@anchor{31e} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{17e,,rvalue}::dereference (gccjit::location loc) + +Given an rvalue of pointer type @code{T *}, dereferencing the pointer, +getting an lvalue of type @code{T}. Analogous to: + +@example +*(EXPR) +@end example + +in C. + +Parameter “loc” is optional. +@end deffn + +If you don’t need to specify the location, this can also be expressed using +an overloaded operator: + +@geindex gccjit;;rvalue;;operator* (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvaluemlEv}@anchor{31f}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvaluemlEv}@anchor{320}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvaluemlEv}@anchor{321}@anchor{cp/topics/expressions gccjit rvalue mul-operator}@anchor{322} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{17e,,rvalue}::operator* () + +@example +gccjit::lvalue content = *ptr; +@end example +@end deffn + +Field access is provided separately for both lvalues and rvalues: + +@geindex gccjit;;lvalue;;access_field (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6lvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{323}@anchor{cp/topics/expressions _CPPv3N6gccjit6lvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{324}@anchor{cp/topics/expressions _CPPv2N6gccjit6lvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{325}@anchor{cp/topics/expressions gccjit lvalue access_field__gccjit field gccjit location}@anchor{326} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{187,,lvalue}::access_field (gccjit::field field, gccjit::location loc) + +Given an lvalue of struct or union type, access the given field, +getting an lvalue of the field’s type. Analogous to: + +@example +(EXPR).field = ...; +@end example + +in C. +@end deffn + +@geindex gccjit;;rvalue;;access_field (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{327}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{328}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvalue12access_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{329}@anchor{cp/topics/expressions gccjit rvalue access_field__gccjit field gccjit location}@anchor{32a} +@deffn {C++ Function} gccjit::@ref{17e,,rvalue} gccjit::@ref{17e,,rvalue}::access_field (gccjit::field field, gccjit::location loc) + +Given an rvalue of struct or union type, access the given field +as an rvalue. Analogous to: + +@example +(EXPR).field +@end example + +in C. +@end deffn + +@geindex gccjit;;rvalue;;dereference_field (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit6rvalue17dereference_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{32b}@anchor{cp/topics/expressions _CPPv3N6gccjit6rvalue17dereference_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{32c}@anchor{cp/topics/expressions _CPPv2N6gccjit6rvalue17dereference_fieldEN6gccjit5fieldEN6gccjit8locationE}@anchor{32d}@anchor{cp/topics/expressions gccjit rvalue dereference_field__gccjit field gccjit location}@anchor{32e} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{17e,,rvalue}::dereference_field (gccjit::field field, gccjit::location loc) + +Given an rvalue of pointer type @code{T *} where T is of struct or union +type, access the given field as an lvalue. Analogous to: + +@example +(EXPR)->field +@end example + +in C, itself equivalent to @code{(*EXPR).FIELD}. +@end deffn + +@geindex gccjit;;context;;new_array_access (C++ function) +@anchor{cp/topics/expressions _CPPv4N6gccjit7context16new_array_accessEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{32f}@anchor{cp/topics/expressions _CPPv3N6gccjit7context16new_array_accessEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{330}@anchor{cp/topics/expressions _CPPv2N6gccjit7context16new_array_accessEN6gccjit6rvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{331}@anchor{cp/topics/expressions gccjit context new_array_access__gccjit rvalue gccjit rvalue gccjit location}@anchor{332} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{175,,context}::new_array_access (gccjit::rvalue ptr, gccjit::rvalue index, gccjit::location loc) + +Given an rvalue of pointer type @code{T *}, get at the element @cite{T} at +the given index, using standard C array indexing rules i.e. each +increment of @code{index} corresponds to @code{sizeof(T)} bytes. +Analogous to: + +@example +PTR[INDEX] +@end example + +in C (or, indeed, to @code{PTR + INDEX}). + +Parameter “loc” is optional. +@end deffn + +For array accesses where you don’t need to specify a @ref{19b,,gccjit;;location}, +two overloaded operators are available: + +@quotation + +gccjit::lvalue gccjit::rvalue::operator[] (gccjit::rvalue index) + +@example +gccjit::lvalue element = array[idx]; +@end example + +gccjit::lvalue gccjit::rvalue::operator[] (int index) + +@example +gccjit::lvalue element = array[0]; +@end example +@end quotation + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Creating and using functions<2>,Source Locations<2>,Expressions<2>,Topic Reference<2> +@anchor{cp/topics/functions doc}@anchor{333}@anchor{cp/topics/functions creating-and-using-functions}@anchor{334} +@subsection Creating and using functions + + +@menu +* Params: Params<2>. +* Functions: Functions<2>. +* Blocks: Blocks<2>. +* Statements: Statements<2>. + +@end menu + +@node Params<2>,Functions<2>,,Creating and using functions<2> +@anchor{cp/topics/functions params}@anchor{335} +@subsubsection Params + + +@geindex gccjit;;param (C++ class) +@anchor{cp/topics/functions _CPPv4N6gccjit5paramE}@anchor{188}@anchor{cp/topics/functions _CPPv3N6gccjit5paramE}@anchor{336}@anchor{cp/topics/functions _CPPv2N6gccjit5paramE}@anchor{337}@anchor{cp/topics/functions gccjit param}@anchor{338} +@deffn {C++ Class} gccjit::param + +A @cite{gccjit::param} represents a parameter to a function. +@end deffn + +@geindex gccjit;;context;;new_param (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit7context9new_paramEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{17c}@anchor{cp/topics/functions _CPPv3N6gccjit7context9new_paramEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{339}@anchor{cp/topics/functions _CPPv2N6gccjit7context9new_paramEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{33a}@anchor{cp/topics/functions gccjit context new_param__gccjit type cCP gccjit location}@anchor{33b} +@deffn {C++ Function} gccjit::@ref{188,,param} gccjit::@ref{175,,context}::new_param (gccjit::type type, const char *name, gccjit::location loc) + +In preparation for creating a function, create a new parameter of the +given type and name. +@end deffn + +@ref{188,,gccjit;;param} is a subclass of @ref{187,,gccjit;;lvalue} (and thus +of @ref{17e,,gccjit;;rvalue} and @ref{17a,,gccjit;;object}). It is a thin +wrapper around the C API’s @ref{25,,gcc_jit_param *}. + +@node Functions<2>,Blocks<2>,Params<2>,Creating and using functions<2> +@anchor{cp/topics/functions functions}@anchor{33c} +@subsubsection Functions + + +@geindex gccjit;;function (C++ class) +@anchor{cp/topics/functions _CPPv4N6gccjit8functionE}@anchor{18c}@anchor{cp/topics/functions _CPPv3N6gccjit8functionE}@anchor{33d}@anchor{cp/topics/functions _CPPv2N6gccjit8functionE}@anchor{33e}@anchor{cp/topics/functions gccjit function}@anchor{33f} +@deffn {C++ Class} gccjit::function + +A @cite{gccjit::function} represents a function - either one that we’re +creating ourselves, or one that we’re referencing. +@end deffn + +@geindex gccjit;;context;;new_function (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit7context12new_functionE21gcc_jit_function_kindN6gccjit4typeEPKcRNSt6vectorI5paramEEiN6gccjit8locationE}@anchor{340}@anchor{cp/topics/functions _CPPv3N6gccjit7context12new_functionE21gcc_jit_function_kindN6gccjit4typeEPKcRNSt6vectorI5paramEEiN6gccjit8locationE}@anchor{341}@anchor{cp/topics/functions _CPPv2N6gccjit7context12new_functionE21gcc_jit_function_kindN6gccjit4typeEPKcRNSt6vectorI5paramEEiN6gccjit8locationE}@anchor{342}@anchor{cp/topics/functions gccjit context new_function__gcc_jit_function_kind gccjit type cCP std vector param R i gccjit location}@anchor{343} +@deffn {C++ Function} gccjit::@ref{18c,,function} gccjit::@ref{175,,context}::new_function (enum gcc_jit_function_kind, gccjit::type return_type, const char *name, std::vector ¶ms, int is_variadic, gccjit::location loc) + +Create a gcc_jit_function with the given name and parameters. + +Parameters “is_variadic” and “loc” are optional. + +This is a wrapper around the C API’s @ref{11,,gcc_jit_context_new_function()}. +@end deffn + +@geindex gccjit;;context;;get_builtin_function (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit7context20get_builtin_functionEPKc}@anchor{344}@anchor{cp/topics/functions _CPPv3N6gccjit7context20get_builtin_functionEPKc}@anchor{345}@anchor{cp/topics/functions _CPPv2N6gccjit7context20get_builtin_functionEPKc}@anchor{346}@anchor{cp/topics/functions gccjit context get_builtin_function__cCP}@anchor{347} +@deffn {C++ Function} gccjit::@ref{18c,,function} gccjit::@ref{175,,context}::get_builtin_function (const char *name) + +This is a wrapper around the C API’s +@ref{10e,,gcc_jit_context_get_builtin_function()}. +@end deffn + +@geindex gccjit;;function;;get_param (C++ function) +@anchor{cp/topics/functions _CPPv4NK6gccjit8function9get_paramEi}@anchor{348}@anchor{cp/topics/functions _CPPv3NK6gccjit8function9get_paramEi}@anchor{349}@anchor{cp/topics/functions _CPPv2NK6gccjit8function9get_paramEi}@anchor{34a}@anchor{cp/topics/functions gccjit function get_param__iC}@anchor{34b} +@deffn {C++ Function} gccjit::@ref{188,,param} gccjit::@ref{18c,,function}::get_param (int index) const + +Get the param of the given index (0-based). +@end deffn + +@geindex gccjit;;function;;dump_to_dot (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit8function11dump_to_dotEPKc}@anchor{194}@anchor{cp/topics/functions _CPPv3N6gccjit8function11dump_to_dotEPKc}@anchor{34c}@anchor{cp/topics/functions _CPPv2N6gccjit8function11dump_to_dotEPKc}@anchor{34d}@anchor{cp/topics/functions gccjit function dump_to_dot__cCP}@anchor{34e} +@deffn {C++ Function} void gccjit::@ref{18c,,function}::dump_to_dot (const char *path) + +Emit the function in graphviz format to the given path. +@end deffn + +@geindex gccjit;;function;;new_local (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit8function9new_localEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{189}@anchor{cp/topics/functions _CPPv3N6gccjit8function9new_localEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{34f}@anchor{cp/topics/functions _CPPv2N6gccjit8function9new_localEN6gccjit4typeEPKcN6gccjit8locationE}@anchor{350}@anchor{cp/topics/functions gccjit function new_local__gccjit type cCP gccjit location}@anchor{351} +@deffn {C++ Function} gccjit::@ref{187,,lvalue} gccjit::@ref{18c,,function}::new_local (gccjit::type type, const char *name, gccjit::location loc) + +Create a new local variable within the function, of the given type and +name. +@end deffn + +@node Blocks<2>,Statements<2>,Functions<2>,Creating and using functions<2> +@anchor{cp/topics/functions blocks}@anchor{352} +@subsubsection Blocks + + +@geindex gccjit;;block (C++ class) +@anchor{cp/topics/functions _CPPv4N6gccjit5blockE}@anchor{18b}@anchor{cp/topics/functions _CPPv3N6gccjit5blockE}@anchor{353}@anchor{cp/topics/functions _CPPv2N6gccjit5blockE}@anchor{354}@anchor{cp/topics/functions gccjit block}@anchor{355} +@deffn {C++ Class} gccjit::block + +A @cite{gccjit::block} represents a basic block within a function i.e. a +sequence of statements with a single entry point and a single exit +point. + +@ref{18b,,gccjit;;block} is a subclass of @ref{17a,,gccjit;;object}. + +The first basic block that you create within a function will +be the entrypoint. + +Each basic block that you create within a function must be +terminated, either with a conditional, a jump, a return, or +a switch. + +It’s legal to have multiple basic blocks that return within +one function. +@end deffn + +@geindex gccjit;;function;;new_block (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit8function9new_blockEPKc}@anchor{356}@anchor{cp/topics/functions _CPPv3N6gccjit8function9new_blockEPKc}@anchor{357}@anchor{cp/topics/functions _CPPv2N6gccjit8function9new_blockEPKc}@anchor{358}@anchor{cp/topics/functions gccjit function new_block__cCP}@anchor{359} +@deffn {C++ Function} gccjit::@ref{18b,,block} gccjit::@ref{18c,,function}::new_block (const char *name) + +Create a basic block of the given name. The name may be NULL, but +providing meaningful names is often helpful when debugging: it may +show up in dumps of the internal representation, and in error +messages. +@end deffn + +@node Statements<2>,,Blocks<2>,Creating and using functions<2> +@anchor{cp/topics/functions statements}@anchor{35a} +@subsubsection Statements + + +@geindex gccjit;;block;;add_eval (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block8add_evalEN6gccjit6rvalueEN6gccjit8locationE}@anchor{302}@anchor{cp/topics/functions _CPPv3N6gccjit5block8add_evalEN6gccjit6rvalueEN6gccjit8locationE}@anchor{35b}@anchor{cp/topics/functions _CPPv2N6gccjit5block8add_evalEN6gccjit6rvalueEN6gccjit8locationE}@anchor{35c}@anchor{cp/topics/functions gccjit block add_eval__gccjit rvalue gccjit location}@anchor{35d} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::add_eval (gccjit::rvalue rvalue, gccjit::location loc) + +Add evaluation of an rvalue, discarding the result +(e.g. a function call that “returns” void). + +This is equivalent to this C code: + +@example +(void)expression; +@end example +@end deffn + +@geindex gccjit;;block;;add_assignment (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block14add_assignmentEN6gccjit6lvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{18d}@anchor{cp/topics/functions _CPPv3N6gccjit5block14add_assignmentEN6gccjit6lvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{35e}@anchor{cp/topics/functions _CPPv2N6gccjit5block14add_assignmentEN6gccjit6lvalueEN6gccjit6rvalueEN6gccjit8locationE}@anchor{35f}@anchor{cp/topics/functions gccjit block add_assignment__gccjit lvalue gccjit rvalue gccjit location}@anchor{360} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::add_assignment (gccjit::lvalue lvalue, gccjit::rvalue rvalue, gccjit::location loc) + +Add evaluation of an rvalue, assigning the result to the given +lvalue. + +This is roughly equivalent to this C code: + +@example +lvalue = rvalue; +@end example +@end deffn + +@geindex gccjit;;block;;add_assignment_op (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block17add_assignment_opEN6gccjit6lvalueE17gcc_jit_binary_opN6gccjit6rvalueEN6gccjit8locationE}@anchor{191}@anchor{cp/topics/functions _CPPv3N6gccjit5block17add_assignment_opEN6gccjit6lvalueE17gcc_jit_binary_opN6gccjit6rvalueEN6gccjit8locationE}@anchor{361}@anchor{cp/topics/functions _CPPv2N6gccjit5block17add_assignment_opEN6gccjit6lvalueE17gcc_jit_binary_opN6gccjit6rvalueEN6gccjit8locationE}@anchor{362}@anchor{cp/topics/functions gccjit block add_assignment_op__gccjit lvalue gcc_jit_binary_op gccjit rvalue gccjit location}@anchor{363} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::add_assignment_op (gccjit::lvalue lvalue, enum gcc_jit_binary_op, gccjit::rvalue rvalue, gccjit::location loc) + +Add evaluation of an rvalue, using the result to modify an +lvalue. + +This is analogous to “+=” and friends: + +@example +lvalue += rvalue; +lvalue *= rvalue; +lvalue /= rvalue; +@end example + +etc. For example: + +@example +/* "i++" */ +loop_body.add_assignment_op ( + i, + GCC_JIT_BINARY_OP_PLUS, + ctxt.one (int_type)); +@end example +@end deffn + +@geindex gccjit;;block;;add_comment (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block11add_commentEPKcN6gccjit8locationE}@anchor{19d}@anchor{cp/topics/functions _CPPv3N6gccjit5block11add_commentEPKcN6gccjit8locationE}@anchor{364}@anchor{cp/topics/functions _CPPv2N6gccjit5block11add_commentEPKcN6gccjit8locationE}@anchor{365}@anchor{cp/topics/functions gccjit block add_comment__cCP gccjit location}@anchor{366} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::add_comment (const char *text, gccjit::location loc) + +Add a no-op textual comment to the internal representation of the +code. It will be optimized away, but will be visible in the dumps +seen via @ref{66,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE} +and @ref{1c,,GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE}, +and thus may be of use when debugging how your project’s internal +representation gets converted to the libgccjit IR. + +Parameter “loc” is optional. +@end deffn + +@geindex gccjit;;block;;end_with_conditional (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block20end_with_conditionalEN6gccjit6rvalueEN6gccjit5blockEN6gccjit5blockEN6gccjit8locationE}@anchor{190}@anchor{cp/topics/functions _CPPv3N6gccjit5block20end_with_conditionalEN6gccjit6rvalueEN6gccjit5blockEN6gccjit5blockEN6gccjit8locationE}@anchor{367}@anchor{cp/topics/functions _CPPv2N6gccjit5block20end_with_conditionalEN6gccjit6rvalueEN6gccjit5blockEN6gccjit5blockEN6gccjit8locationE}@anchor{368}@anchor{cp/topics/functions gccjit block end_with_conditional__gccjit rvalue gccjit block gccjit block gccjit location}@anchor{369} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::end_with_conditional (gccjit::rvalue boolval, gccjit::block on_true, gccjit::block on_false, gccjit::location loc) + +Terminate a block by adding evaluation of an rvalue, branching on the +result to the appropriate successor block. + +This is roughly equivalent to this C code: + +@example +if (boolval) + goto on_true; +else + goto on_false; +@end example + +block, boolval, on_true, and on_false must be non-NULL. +@end deffn + +@geindex gccjit;;block;;end_with_jump (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block13end_with_jumpEN6gccjit5blockEN6gccjit8locationE}@anchor{36a}@anchor{cp/topics/functions _CPPv3N6gccjit5block13end_with_jumpEN6gccjit5blockEN6gccjit8locationE}@anchor{36b}@anchor{cp/topics/functions _CPPv2N6gccjit5block13end_with_jumpEN6gccjit5blockEN6gccjit8locationE}@anchor{36c}@anchor{cp/topics/functions gccjit block end_with_jump__gccjit block gccjit location}@anchor{36d} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::end_with_jump (gccjit::block target, gccjit::location loc) + +Terminate a block by adding a jump to the given target block. + +This is roughly equivalent to this C code: + +@example +goto target; +@end example +@end deffn + +@geindex gccjit;;block;;end_with_return (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block15end_with_returnEN6gccjit6rvalueEN6gccjit8locationE}@anchor{36e}@anchor{cp/topics/functions _CPPv3N6gccjit5block15end_with_returnEN6gccjit6rvalueEN6gccjit8locationE}@anchor{36f}@anchor{cp/topics/functions _CPPv2N6gccjit5block15end_with_returnEN6gccjit6rvalueEN6gccjit8locationE}@anchor{370}@anchor{cp/topics/functions gccjit block end_with_return__gccjit rvalue gccjit location}@anchor{371} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::end_with_return (gccjit::rvalue rvalue, gccjit::location loc) + +Terminate a block. + +Both params are optional. + +An rvalue must be provided for a function returning non-void, and +must not be provided by a function “returning” @cite{void}. + +If an rvalue is provided, the block is terminated by evaluating the +rvalue and returning the value. + +This is roughly equivalent to this C code: + +@example +return expression; +@end example + +If an rvalue is not provided, the block is terminated by adding a +valueless return, for use within a function with “void” return type. + +This is equivalent to this C code: + +@example +return; +@end example +@end deffn + +@geindex gccjit;;block;;end_with_switch (C++ function) +@anchor{cp/topics/functions _CPPv4N6gccjit5block15end_with_switchEN6gccjit6rvalueEN6gccjit5blockENSt6vectorIN6gccjit5case_EEEN6gccjit8locationE}@anchor{372}@anchor{cp/topics/functions _CPPv3N6gccjit5block15end_with_switchEN6gccjit6rvalueEN6gccjit5blockENSt6vectorIN6gccjit5case_EEEN6gccjit8locationE}@anchor{373}@anchor{cp/topics/functions _CPPv2N6gccjit5block15end_with_switchEN6gccjit6rvalueEN6gccjit5blockENSt6vectorIN6gccjit5case_EEEN6gccjit8locationE}@anchor{374}@anchor{cp/topics/functions gccjit block end_with_switch__gccjit rvalue gccjit block std vector gccjit case_ gccjit location}@anchor{375} +@deffn {C++ Function} void gccjit::@ref{18b,,block}::end_with_switch (gccjit::rvalue expr, gccjit::block default_block, std::vector cases, gccjit::location loc) + +Terminate a block by adding evalation of an rvalue, then performing +a multiway branch. + +This is roughly equivalent to this C code: + +@example +switch (expr) + @{ + default: + goto default_block; + + case C0.min_value ... C0.max_value: + goto C0.dest_block; + + case C1.min_value ... C1.max_value: + goto C1.dest_block; + + ...etc... + + case C[N - 1].min_value ... C[N - 1].max_value: + goto C[N - 1].dest_block; +@} +@end example + +@code{expr} must be of the same integer type as all of the @code{min_value} +and @code{max_value} within the cases. + +The ranges of the cases must not overlap (or have duplicate +values). + +The API entrypoints relating to switch statements and cases: + +@quotation + + +@itemize * + +@item +@ref{372,,gccjit;;block;;end_with_switch()} + +@item +@code{gccjit::context::new_case()} +@end itemize +@end quotation + +were added in @ref{11f,,LIBGCCJIT_ABI_3}; you can test for their presence +using + +@example +#ifdef LIBGCCJIT_HAVE_SWITCH_STATEMENTS +@end example + +A @cite{gccjit::case_} represents a case within a switch statement, and +is created within a particular @ref{175,,gccjit;;context} using +@code{gccjit::context::new_case()}. It is a subclass of +@ref{17a,,gccjit;;object}. + +Each case expresses a multivalued range of integer values. You +can express single-valued cases by passing in the same value for +both @cite{min_value} and @cite{max_value}. + +Here’s an example of creating a switch statement: + +@quotation + +@example + +void +create_code (gcc_jit_context *c_ctxt, void *user_data) +@{ + /* Let's try to inject the equivalent of: + int + test_switch (int x) + @{ + switch (x) + @{ + case 0 ... 5: + return 3; + + case 25 ... 27: + return 4; + + case -42 ... -17: + return 83; + + case 40: + return 8; + + default: + return 10; + @} + @} + */ + gccjit::context ctxt (c_ctxt); + gccjit::type t_int = ctxt.get_type (GCC_JIT_TYPE_INT); + gccjit::type return_type = t_int; + gccjit::param x = ctxt.new_param (t_int, "x"); + std::vector params; + params.push_back (x); + gccjit::function func = ctxt.new_function (GCC_JIT_FUNCTION_EXPORTED, + return_type, + "test_switch", + params, 0); + + gccjit::block b_initial = func.new_block ("initial"); + + gccjit::block b_default = func.new_block ("default"); + gccjit::block b_case_0_5 = func.new_block ("case_0_5"); + gccjit::block b_case_25_27 = func.new_block ("case_25_27"); + gccjit::block b_case_m42_m17 = func.new_block ("case_m42_m17"); + gccjit::block b_case_40 = func.new_block ("case_40"); + + std::vector cases; + cases.push_back (ctxt.new_case (ctxt.new_rvalue (t_int, 0), + ctxt.new_rvalue (t_int, 5), + b_case_0_5)); + cases.push_back (ctxt.new_case (ctxt.new_rvalue (t_int, 25), + ctxt.new_rvalue (t_int, 27), + b_case_25_27)); + cases.push_back (ctxt.new_case (ctxt.new_rvalue (t_int, -42), + ctxt.new_rvalue (t_int, -17), + b_case_m42_m17)); + cases.push_back (ctxt.new_case (ctxt.new_rvalue (t_int, 40), + ctxt.new_rvalue (t_int, 40), + b_case_40)); + b_initial.end_with_switch (x, + b_default, + cases); + + b_case_0_5.end_with_return (ctxt.new_rvalue (t_int, 3)); + b_case_25_27.end_with_return (ctxt.new_rvalue (t_int, 4)); + b_case_m42_m17.end_with_return (ctxt.new_rvalue (t_int, 83)); + b_case_40.end_with_return (ctxt.new_rvalue (t_int, 8)); + b_default.end_with_return (ctxt.new_rvalue (t_int, 10)); +@} + +@end example +@end quotation +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Source Locations<2>,Compiling a context<2>,Creating and using functions<2>,Topic Reference<2> +@anchor{cp/topics/locations doc}@anchor{376}@anchor{cp/topics/locations source-locations}@anchor{377} +@subsection Source Locations + + +@geindex gccjit;;location (C++ class) +@anchor{cp/topics/locations _CPPv4N6gccjit8locationE}@anchor{19b}@anchor{cp/topics/locations _CPPv3N6gccjit8locationE}@anchor{378}@anchor{cp/topics/locations _CPPv2N6gccjit8locationE}@anchor{379}@anchor{cp/topics/locations gccjit location}@anchor{37a} +@deffn {C++ Class} gccjit::location + +A @cite{gccjit::location} encapsulates a source code location, so that +you can (optionally) associate locations in your language with +statements in the JIT-compiled code, allowing the debugger to +single-step through your language. + +@cite{gccjit::location} instances are optional: you can always omit them +from any C++ API entrypoint accepting one. + +You can construct them using @ref{1a1,,gccjit;;context;;new_location()}. + +You need to enable @ref{42,,GCC_JIT_BOOL_OPTION_DEBUGINFO} on the +@ref{175,,gccjit;;context} for these locations to actually be usable by +the debugger: + +@example +ctxt.set_bool_option (GCC_JIT_BOOL_OPTION_DEBUGINFO, 1); +@end example +@end deffn + +@geindex gccjit;;context;;new_location (C++ function) +@anchor{cp/topics/locations _CPPv4N6gccjit7context12new_locationEPKcii}@anchor{1a1}@anchor{cp/topics/locations _CPPv3N6gccjit7context12new_locationEPKcii}@anchor{37b}@anchor{cp/topics/locations _CPPv2N6gccjit7context12new_locationEPKcii}@anchor{37c}@anchor{cp/topics/locations gccjit context new_location__cCP i i}@anchor{37d} +@deffn {C++ Function} gccjit::@ref{19b,,location} gccjit::@ref{175,,context}::new_location (const char *filename, int line, int column) + +Create a @cite{gccjit::location} instance representing the given source +location. +@end deffn + +@menu +* Faking it: Faking it<2>. + +@end menu + +@node Faking it<2>,,,Source Locations<2> +@anchor{cp/topics/locations faking-it}@anchor{37e} +@subsubsection Faking it + + +If you don’t have source code for your internal representation, but need +to debug, you can generate a C-like representation of the functions in +your context using @ref{1c0,,gccjit;;context;;dump_to_file()}: + +@example +ctxt.dump_to_file ("/tmp/something.c", + 1 /* update_locations */); +@end example + +This will dump C-like code to the given path. If the @cite{update_locations} +argument is true, this will also set up @cite{gccjit::location} information +throughout the context, pointing at the dump file as if it were a source +file, giving you @emph{something} you can step through in the debugger. + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Compiling a context<2>,Using Assembly Language with libgccjit++,Source Locations<2>,Topic Reference<2> +@anchor{cp/topics/compilation doc}@anchor{37f}@anchor{cp/topics/compilation compiling-a-context}@anchor{380} +@subsection Compiling a context + + +Once populated, a @ref{175,,gccjit;;context} can be compiled to +machine code, either in-memory via @ref{17f,,gccjit;;context;;compile()} or +to disk via @ref{381,,gccjit;;context;;compile_to_file()}. + +You can compile a context multiple times (using either form of +compilation), although any errors that occur on the context will +prevent any future compilation of that context. + +@menu +* In-memory compilation: In-memory compilation<2>. +* Ahead-of-time compilation: Ahead-of-time compilation<2>. + +@end menu + +@node In-memory compilation<2>,Ahead-of-time compilation<2>,,Compiling a context<2> +@anchor{cp/topics/compilation in-memory-compilation}@anchor{382} +@subsubsection In-memory compilation + + +@geindex gccjit;;context;;compile (C++ function) +@anchor{cp/topics/compilation _CPPv4N6gccjit7context7compileEv}@anchor{17f}@anchor{cp/topics/compilation _CPPv3N6gccjit7context7compileEv}@anchor{383}@anchor{cp/topics/compilation _CPPv2N6gccjit7context7compileEv}@anchor{384}@anchor{cp/topics/compilation gccjit context compile}@anchor{385} +@deffn {C++ Function} gcc_jit_result *gccjit::@ref{175,,context}::compile () + +This calls into GCC and builds the code, returning a +@cite{gcc_jit_result *}. + +This is a thin wrapper around the +@ref{15,,gcc_jit_context_compile()} API entrypoint. +@end deffn + +@node Ahead-of-time compilation<2>,,In-memory compilation<2>,Compiling a context<2> +@anchor{cp/topics/compilation ahead-of-time-compilation}@anchor{386} +@subsubsection Ahead-of-time compilation + + +Although libgccjit is primarily aimed at just-in-time compilation, it +can also be used for implementing more traditional ahead-of-time +compilers, via the @ref{381,,gccjit;;context;;compile_to_file()} method. + +@geindex gccjit;;context;;compile_to_file (C++ function) +@anchor{cp/topics/compilation _CPPv4N6gccjit7context15compile_to_fileE19gcc_jit_output_kindPKc}@anchor{381}@anchor{cp/topics/compilation _CPPv3N6gccjit7context15compile_to_fileE19gcc_jit_output_kindPKc}@anchor{387}@anchor{cp/topics/compilation _CPPv2N6gccjit7context15compile_to_fileE19gcc_jit_output_kindPKc}@anchor{388}@anchor{cp/topics/compilation gccjit context compile_to_file__gcc_jit_output_kind cCP}@anchor{389} +@deffn {C++ Function} void gccjit::@ref{175,,context}::compile_to_file (enum gcc_jit_output_kind, const char *output_path) + +Compile the @ref{175,,gccjit;;context} to a file of the given +kind. + +This is a thin wrapper around the +@ref{4a,,gcc_jit_context_compile_to_file()} API entrypoint. +@end deffn + +@c Copyright (C) 2020-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Using Assembly Language with libgccjit++,,Compiling a context<2>,Topic Reference<2> +@anchor{cp/topics/asm doc}@anchor{38a}@anchor{cp/topics/asm using-assembly-language-with-libgccjit}@anchor{38b} +@subsection Using Assembly Language with libgccjit++ + + +libgccjit has some support for directly embedding assembler instructions. +This is based on GCC’s support for inline @code{asm} in C code, and the +following assumes a familiarity with that functionality. See +How to Use Inline Assembly Language in C Code@footnote{https://gcc.gnu.org/onlinedocs/gcc/Using-Assembly-Language-with-C.html} +in GCC’s documentation, the “Extended Asm” section in particular. + +These entrypoints were added in @ref{151,,LIBGCCJIT_ABI_15}; you can test +for their presence using + +@quotation + +@example +#ifdef LIBGCCJIT_HAVE_ASM_STATEMENTS +@end example +@end quotation + +@menu +* Adding assembler instructions within a function: Adding assembler instructions within a function<2>. +* Adding top-level assembler statements: Adding top-level assembler statements<2>. + +@end menu + +@node Adding assembler instructions within a function<2>,Adding top-level assembler statements<2>,,Using Assembly Language with libgccjit++ +@anchor{cp/topics/asm adding-assembler-instructions-within-a-function}@anchor{38c} +@subsubsection Adding assembler instructions within a function + + +@geindex gccjit;;extended_asm (C++ class) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asmE}@anchor{38d}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asmE}@anchor{38e}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asmE}@anchor{38f}@anchor{cp/topics/asm gccjit extended_asm}@anchor{390} +@deffn {C++ Class} gccjit::extended_asm + +A @cite{gccjit::extended_asm} represents an extended @code{asm} statement: a +series of low-level instructions inside a function that convert inputs +to outputs. + +@ref{38d,,gccjit;;extended_asm} is a subclass of @ref{17a,,gccjit;;object}. +It is a thin wrapper around the C API’s @ref{120,,gcc_jit_extended_asm *}. + +To avoid having an API entrypoint with a very large number of +parameters, an extended @code{asm} statement is made in stages: +an initial call to create the @ref{38d,,gccjit;;extended_asm}, +followed by calls to add operands and set other properties of the +statement. + +There are two API entrypoints for creating a @ref{38d,,gccjit;;extended_asm}: + + +@itemize * + +@item +@ref{391,,gccjit;;block;;add_extended_asm()} for an @code{asm} statement with +no control flow, and + +@item +@ref{392,,gccjit;;block;;end_with_extended_asm_goto()} for an @code{asm goto}. +@end itemize + +For example, to create the equivalent of: + +@example + asm ("mov %1, %0\n\t" + "add $1, %0" + : "=r" (dst) + : "r" (src)); +@end example + +the following API calls could be used: + +@example + block.add_extended_asm ("mov %1, %0\n\t" + "add $1, %0") + .add_output_operand ("=r", dst) + .add_input_operand ("r", src); +@end example + +@cartouche +@quotation Warning +When considering the numbering of operands within an +extended @code{asm} statement (e.g. the @code{%0} and @code{%1} +above), the equivalent to the C syntax is followed i.e. all +output operands, then all input operands, regardless of +what order the calls to +@ref{393,,gccjit;;extended_asm;;add_output_operand()} and +@ref{394,,gccjit;;extended_asm;;add_input_operand()} were made in. +@end quotation +@end cartouche + +As in the C syntax, operands can be given symbolic names to avoid having +to number them. For example, to create the equivalent of: + +@example + asm ("bsfl %[aMask], %[aIndex]" + : [aIndex] "=r" (Index) + : [aMask] "r" (Mask) + : "cc"); +@end example + +the following API calls could be used: + +@example + block.add_extended_asm ("bsfl %[aMask], %[aIndex]") + .add_output_operand ("aIndex", "=r", index) + .add_input_operand ("aMask", "r", mask) + .add_clobber ("cc"); +@end example +@end deffn + +@geindex gccjit;;block;;add_extended_asm (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit5block16add_extended_asmERKNSt6stringEN6gccjit8locationE}@anchor{391}@anchor{cp/topics/asm _CPPv3N6gccjit5block16add_extended_asmERKNSt6stringEN6gccjit8locationE}@anchor{395}@anchor{cp/topics/asm _CPPv2N6gccjit5block16add_extended_asmERKNSt6stringEN6gccjit8locationE}@anchor{396}@anchor{cp/topics/asm gccjit block add_extended_asm__ssCR gccjit location}@anchor{397} +@deffn {C++ Function} @ref{38d,,extended_asm} gccjit::@ref{18b,,block}::add_extended_asm (const std::string &asm_template, gccjit::location loc = location()) + +Create a @ref{38d,,gccjit;;extended_asm} for an extended @code{asm} statement +with no control flow (i.e. without the @code{goto} qualifier). + +The parameter @code{asm_template} corresponds to the @cite{AssemblerTemplate} +within C’s extended @code{asm} syntax. It must be non-NULL. The call takes +a copy of the underlying string, so it is valid to pass in a pointer to +an on-stack buffer. +@end deffn + +@geindex gccjit;;block;;end_with_extended_asm_goto (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit5block26end_with_extended_asm_gotoERKNSt6stringENSt6vectorI5blockEEP5block8location}@anchor{392}@anchor{cp/topics/asm _CPPv3N6gccjit5block26end_with_extended_asm_gotoERKNSt6stringENSt6vectorI5blockEEP5block8location}@anchor{398}@anchor{cp/topics/asm _CPPv2N6gccjit5block26end_with_extended_asm_gotoERKNSt6stringENSt6vectorI5blockEEP5block8location}@anchor{399}@anchor{cp/topics/asm gccjit block end_with_extended_asm_goto__ssCR std vector block blockP location}@anchor{39a} +@deffn {C++ Function} @ref{38d,,extended_asm} gccjit::@ref{18b,,block}::end_with_extended_asm_goto (const std::string &asm_template, std::vector goto_blocks, block *fallthrough_block, location loc = location()) + +Create a @ref{38d,,gccjit;;extended_asm} for an extended @code{asm} statement +that may perform jumps, and use it to terminate the given block. +This is equivalent to the @code{goto} qualifier in C’s extended @code{asm} +syntax. + +For example, to create the equivalent of: + +@example + asm goto ("btl %1, %0\n\t" + "jc %l[carry]" + : // No outputs + : "r" (p1), "r" (p2) + : "cc" + : carry); +@end example + +the following API calls could be used: + +@example + const char *asm_template = + (use_name + ? /* Label referred to by name: "%l[carry]". */ + ("btl %1, %0\n\t" + "jc %l[carry]") + : /* Label referred to numerically: "%l2". */ + ("btl %1, %0\n\t" + "jc %l2")); + + std::vector goto_blocks (@{b_carry@}); + gccjit::extended_asm ext_asm + = (b_start.end_with_extended_asm_goto (asm_template, + goto_blocks, + &b_fallthru) + .add_input_operand ("r", p1) + .add_input_operand ("r", p2) + .add_clobber ("cc")); +@end example + +here referencing a @code{gcc_jit_block} named “carry”. + +@code{num_goto_blocks} corresponds to the @code{GotoLabels} parameter within C’s +extended @code{asm} syntax. The block names can be referenced within the +assembler template. + +@code{fallthrough_block} can be NULL. If non-NULL, it specifies the block +to fall through to after the statement. + +@cartouche +@quotation Note +This is needed since each @ref{18b,,gccjit;;block} must have a +single exit point, as a basic block: you can’t jump from the +middle of a block. A “goto” is implicitly added after the +asm to handle the fallthrough case, which is equivalent to what +would have happened in the C case. +@end quotation +@end cartouche +@end deffn + +@geindex gccjit;;extended_asm;;set_volatile_flag (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm17set_volatile_flagEb}@anchor{39b}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm17set_volatile_flagEb}@anchor{39c}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm17set_volatile_flagEb}@anchor{39d}@anchor{cp/topics/asm gccjit extended_asm set_volatile_flag__b}@anchor{39e} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::set_volatile_flag (bool flag) + +Set whether the @ref{38d,,gccjit;;extended_asm} has side-effects, equivalent to the +volatile@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Volatile} +qualifier in C’s extended asm syntax. + +For example, to create the equivalent of: + +@example +asm volatile ("rdtsc\n\t" // Returns the time in EDX:EAX. + "shl $32, %%rdx\n\t" // Shift the upper bits left. + "or %%rdx, %0" // 'Or' in the lower bits. + : "=a" (msr) + : + : "rdx"); +@end example + +the following API calls could be used: + +@example + gccjit::extended_asm ext_asm + = block.add_extended_asm + ("rdtsc\n\t" /* Returns the time in EDX:EAX. */ + "shl $32, %%rdx\n\t" /* Shift the upper bits left. */ + "or %%rdx, %0") /* 'Or' in the lower bits. */ + .set_volatile_flag (true) + .add_output_operand ("=a", msr) + .add_clobber ("rdx"); +@end example + +where the @ref{38d,,gccjit;;extended_asm} is flagged as volatile. +@end deffn + +@geindex gccjit;;extended_asm;;set_inline_flag (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm15set_inline_flagEb}@anchor{39f}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm15set_inline_flagEb}@anchor{3a0}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm15set_inline_flagEb}@anchor{3a1}@anchor{cp/topics/asm gccjit extended_asm set_inline_flag__b}@anchor{3a2} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::set_inline_flag (bool flag) + +Set the equivalent of the +inline@footnote{https://gcc.gnu.org/onlinedocs/gcc/Size-of-an-asm.html#Size-of-an-asm} +qualifier in C’s extended @code{asm} syntax. +@end deffn + +@geindex gccjit;;extended_asm;;add_output_operand (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm18add_output_operandERKNSt6stringERKNSt6stringEN6gccjit6lvalueE}@anchor{393}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm18add_output_operandERKNSt6stringERKNSt6stringEN6gccjit6lvalueE}@anchor{3a3}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm18add_output_operandERKNSt6stringERKNSt6stringEN6gccjit6lvalueE}@anchor{3a4}@anchor{cp/topics/asm gccjit extended_asm add_output_operand__ssCR ssCR gccjit lvalue}@anchor{3a5} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::add_output_operand (const std::string &asm_symbolic_name, const std::string &constraint, gccjit::lvalue dest) + +Add an output operand to the extended @code{asm} statement. See the +Output Operands@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#OutputOperands} +section of the documentation of the C syntax. + +@code{asm_symbolic_name} corresponds to the @code{asmSymbolicName} component of +C’s extended @code{asm} syntax, and specifies the symbolic name for the operand. +See the overload below for an alternative that does not supply a symbolic +name. + +@code{constraint} corresponds to the @code{constraint} component of C’s extended +@code{asm} syntax. + +@code{dest} corresponds to the @code{cvariablename} component of C’s extended +@code{asm} syntax. + +@example +// Example with a symbolic name ("aIndex"), the equivalent of: +// : [aIndex] "=r" (index) +ext_asm.add_output_operand ("aIndex", "=r", index); +@end example + +This function can’t be called on an @code{asm goto} as such instructions can’t +have outputs; see the +Goto Labels@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#GotoLabels} +section of GCC’s “Extended Asm” documentation. +@end deffn + +@geindex gccjit;;extended_asm;;add_output_operand (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm18add_output_operandERKNSt6stringEN6gccjit6lvalueE}@anchor{3a6}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm18add_output_operandERKNSt6stringEN6gccjit6lvalueE}@anchor{3a7}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm18add_output_operandERKNSt6stringEN6gccjit6lvalueE}@anchor{3a8}@anchor{cp/topics/asm gccjit extended_asm add_output_operand__ssCR gccjit lvalue}@anchor{3a9} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::add_output_operand (const std::string &constraint, gccjit::lvalue dest) + +As above, but don’t supply a symbolic name for the operand. + +@example +// Example without a symbolic name, the equivalent of: +// : "=r" (dst) +ext_asm.add_output_operand ("=r", dst); +@end example +@end deffn + +@geindex gccjit;;extended_asm;;add_input_operand (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm17add_input_operandERKNSt6stringERKNSt6stringEN6gccjit6rvalueE}@anchor{394}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm17add_input_operandERKNSt6stringERKNSt6stringEN6gccjit6rvalueE}@anchor{3aa}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm17add_input_operandERKNSt6stringERKNSt6stringEN6gccjit6rvalueE}@anchor{3ab}@anchor{cp/topics/asm gccjit extended_asm add_input_operand__ssCR ssCR gccjit rvalue}@anchor{3ac} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::add_input_operand (const std::string &asm_symbolic_name, const std::string &constraint, gccjit::rvalue src) + +Add an input operand to the extended @code{asm} statement. See the +Input Operands@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#InputOperands} +section of the documentation of the C syntax. + +@code{asm_symbolic_name} corresponds to the @code{asmSymbolicName} component +of C’s extended @code{asm} syntax. See the overload below for an alternative +that does not supply a symbolic name. + +@code{constraint} corresponds to the @code{constraint} component of C’s extended +@code{asm} syntax. + +@code{src} corresponds to the @code{cexpression} component of C’s extended +@code{asm} syntax. + +@example +// Example with a symbolic name ("aMask"), the equivalent of: +// : [aMask] "r" (Mask) +ext_asm.add_input_operand ("aMask", "r", mask); +@end example +@end deffn + +@geindex gccjit;;extended_asm;;add_input_operand (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm17add_input_operandERKNSt6stringEN6gccjit6rvalueE}@anchor{3ad}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm17add_input_operandERKNSt6stringEN6gccjit6rvalueE}@anchor{3ae}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm17add_input_operandERKNSt6stringEN6gccjit6rvalueE}@anchor{3af}@anchor{cp/topics/asm gccjit extended_asm add_input_operand__ssCR gccjit rvalue}@anchor{3b0} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::add_input_operand (const std::string &constraint, gccjit::rvalue src) + +As above, but don’t supply a symbolic name for the operand. + +@example +// Example without a symbolic name, the equivalent of: +// : "r" (src) +ext_asm.add_input_operand ("r", src); +@end example +@end deffn + +@geindex gccjit;;extended_asm;;add_clobber (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit12extended_asm11add_clobberERKNSt6stringE}@anchor{3b1}@anchor{cp/topics/asm _CPPv3N6gccjit12extended_asm11add_clobberERKNSt6stringE}@anchor{3b2}@anchor{cp/topics/asm _CPPv2N6gccjit12extended_asm11add_clobberERKNSt6stringE}@anchor{3b3}@anchor{cp/topics/asm gccjit extended_asm add_clobber__ssCR}@anchor{3b4} +@deffn {C++ Function} gccjit::@ref{38d,,extended_asm} &gccjit::@ref{38d,,extended_asm}::add_clobber (const std::string &victim) + +Add @cite{victim} to the list of registers clobbered by the extended @code{asm} +statement. See the +Clobbers and Scratch Registers@footnote{https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#Clobbers-and-Scratch-Registers#} +section of the documentation of the C syntax. + +Statements with multiple clobbers will require multiple calls, one per +clobber. + +For example: + +@example +ext_asm.add_clobber ("r0").add_clobber ("cc").add_clobber ("memory"); +@end example +@end deffn + +@node Adding top-level assembler statements<2>,,Adding assembler instructions within a function<2>,Using Assembly Language with libgccjit++ +@anchor{cp/topics/asm adding-top-level-assembler-statements}@anchor{3b5} +@subsubsection Adding top-level assembler statements + + +In addition to creating extended @code{asm} instructions within a function, +there is support for creating “top-level” assembler statements, outside +of any function. + +@geindex gccjit;;context;;add_top_level_asm (C++ function) +@anchor{cp/topics/asm _CPPv4N6gccjit7context17add_top_level_asmEPKcN6gccjit8locationE}@anchor{3b6}@anchor{cp/topics/asm _CPPv3N6gccjit7context17add_top_level_asmEPKcN6gccjit8locationE}@anchor{3b7}@anchor{cp/topics/asm _CPPv2N6gccjit7context17add_top_level_asmEPKcN6gccjit8locationE}@anchor{3b8}@anchor{cp/topics/asm gccjit context add_top_level_asm__cCP gccjit location}@anchor{3b9} +@deffn {C++ Function} void gccjit::@ref{175,,context}::add_top_level_asm (const char *asm_stmts, gccjit::location loc = location()) + +Create a set of top-level asm statements, analogous to those created +by GCC’s “basic” @code{asm} syntax in C at file scope. + +For example, to create the equivalent of: + +@example + asm ("\t.pushsection .text\n" + "\t.globl add_asm\n" + "\t.type add_asm, @@function\n" + "add_asm:\n" + "\tmovq %rdi, %rax\n" + "\tadd %rsi, %rax\n" + "\tret\n" + "\t.popsection\n"); +@end example + +the following API calls could be used: + +@example + ctxt.add_top_level_asm ("\t.pushsection .text\n" + "\t.globl add_asm\n" + "\t.type add_asm, @@function\n" + "add_asm:\n" + "\tmovq %rdi, %rax\n" + "\tadd %rsi, %rax\n" + "\tret\n" + "\t# some asm here\n" + "\t.popsection\n"); +@end example +@end deffn + +@c Copyright (C) 2014-2022 Free Software Foundation, Inc. +@c Originally contributed by David Malcolm +@c +@c This is free software: you can redistribute it and/or modify it +@c under the terms of the GNU General Public License as published by +@c the Free Software Foundation, either version 3 of the License, or +@c (at your option) any later version. +@c +@c This program is distributed in the hope that it will be useful, but +@c WITHOUT ANY WARRANTY; without even the implied warranty of +@c MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +@c General Public License for more details. +@c +@c You should have received a copy of the GNU General Public License +@c along with this program. If not, see +@c . + +@node Internals,Indices and tables,C++ bindings for libgccjit,Top +@anchor{internals/index doc}@anchor{3ba}@anchor{internals/index internals}@anchor{3bb} +@chapter Internals + + +@menu +* Working on the JIT library:: +* Running the test suite:: +* Environment variables:: +* Packaging notes:: +* Overview of code structure:: +* Design notes:: +* Submitting patches:: + +@end menu + +@node Working on the JIT library,Running the test suite,,Internals +@anchor{internals/index working-on-the-jit-library}@anchor{3bc} +@section Working on the JIT library + + +Having checked out the source code (to “src”), you can configure and build +the JIT library like this: + +@example +mkdir build +mkdir install +PREFIX=$(pwd)/install +cd build +../src/configure \ + --enable-host-shared \ + --enable-languages=jit,c++ \ + --disable-bootstrap \ + --enable-checking=release \ + --prefix=$PREFIX +nice make -j4 # altering the "4" to however many cores you have +@end example + +This should build a libgccjit.so within jit/build/gcc: + +@example +[build] $ file gcc/libgccjit.so* +gcc/libgccjit.so: symbolic link to `libgccjit.so.0' +gcc/libgccjit.so.0: symbolic link to `libgccjit.so.0.0.1' +gcc/libgccjit.so.0.0.1: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked, not stripped +@end example + +Here’s what those configuration options mean: + +@geindex command line option; --enable-host-shared +@anchor{internals/index cmdoption-enable-host-shared}@anchor{3bd} +@deffn {Option} @w{-}@w{-}enable@w{-}host@w{-}shared + +Configuring with this option means that the compiler is built as +position-independent code, which incurs a slight performance hit, +but it necessary for a shared library. +@end deffn + +@geindex command line option; --enable-languages=jit@comma{}c++ +@anchor{internals/index cmdoption-enable-languages}@anchor{3be} +@deffn {Option} @w{-}@w{-}enable@w{-}languages=jit,c++ + +This specifies which frontends to build. The JIT library looks like +a frontend to the rest of the code. + +The C++ portion of the JIT test suite requires the C++ frontend to be +enabled at configure-time, or you may see errors like this when +running the test suite: + +@example +xgcc: error: /home/david/jit/src/gcc/testsuite/jit.dg/test-quadratic.cc: C++ compiler not installed on this system +c++: error trying to exec 'cc1plus': execvp: No such file or directory +@end example +@end deffn + +@geindex command line option; --disable-bootstrap +@anchor{internals/index cmdoption-disable-bootstrap}@anchor{3bf} +@deffn {Option} @w{-}@w{-}disable@w{-}bootstrap + +For hacking on the “jit” subdirectory, performing a full +bootstrap can be overkill, since it’s unused by a bootstrap. However, +when submitting patches, you should remove this option, to ensure that +the compiler can still bootstrap itself. +@end deffn + +@geindex command line option; --enable-checking=release +@anchor{internals/index cmdoption-enable-checking}@anchor{3c0} +@deffn {Option} @w{-}@w{-}enable@w{-}checking=release + +The compile can perform extensive self-checking as it runs, useful when +debugging, but slowing things down. + +For maximum speed, configure with @code{--enable-checking=release} to +disable this self-checking. +@end deffn + +@node Running the test suite,Environment variables,Working on the JIT library,Internals +@anchor{internals/index running-the-test-suite}@anchor{3c1} +@section Running the test suite + + +@example +[build] $ cd gcc +[gcc] $ make check-jit RUNTESTFLAGS="-v -v -v" +@end example + +A summary of the tests can then be seen in: + +@example +jit/build/gcc/testsuite/jit/jit.sum +@end example + +and detailed logs in: + +@example +jit/build/gcc/testsuite/jit/jit.log +@end example + +The test executables are normally deleted after each test is run. For +debugging, they can be preserved by setting +@geindex PRESERVE_EXECUTABLES +@geindex environment variable; PRESERVE_EXECUTABLES +@code{PRESERVE_EXECUTABLES} +in the environment. If so, they can then be seen as: + +@example +jit/build/gcc/testsuite/jit/*.exe +@end example + +which can be run independently. + +You can compile and run individual tests by passing “jit.exp=TESTNAME” to RUNTESTFLAGS e.g.: + +@example +[gcc] $ PRESERVE_EXECUTABLES= \ + make check-jit \ + RUNTESTFLAGS="-v -v -v jit.exp=test-factorial.c" +@end example + +and once a test has been compiled, you can debug it directly: + +@example +[gcc] $ PATH=.:$PATH \ + LD_LIBRARY_PATH=. \ + LIBRARY_PATH=. \ + gdb --args \ + testsuite/jit/test-factorial.c.exe +@end example + +@menu +* Running under valgrind:: + +@end menu + +@node Running under valgrind,,,Running the test suite +@anchor{internals/index running-under-valgrind}@anchor{3c2} +@subsection Running under valgrind + + +The jit testsuite detects if +@geindex RUN_UNDER_VALGRIND +@geindex environment variable; RUN_UNDER_VALGRIND +@code{RUN_UNDER_VALGRIND} is present in the +environment (with any value). If it is present, it runs the test client +code under valgrind@footnote{https://valgrind.org}, +specifcally, the default +memcheck@footnote{https://valgrind.org/docs/manual/mc-manual.html} +tool with +--leak-check=full@footnote{https://valgrind.org/docs/manual/mc-manual.html#opt.leak-check}. + +It automatically parses the output from valgrind, injecting XFAIL results if +any issues are found, or PASS results if the output is clean. The output +is saved to @code{TESTNAME.exe.valgrind.txt}. + +For example, the following invocation verbosely runs the testcase +@code{test-sum-of-squares.c} under valgrind, showing an issue: + +@example +$ RUN_UNDER_VALGRIND= \ + make check-jit \ + RUNTESTFLAGS="-v -v -v jit.exp=test-sum-of-squares.c" + +(...verbose log contains detailed valgrind errors, if any...) + + === jit Summary === + +# of expected passes 28 +# of expected failures 2 + +$ less testsuite/jit/jit.sum +(...other results...) +XFAIL: jit.dg/test-sum-of-squares.c: test-sum-of-squares.c.exe.valgrind.txt: definitely lost: 8 bytes in 1 blocks +XFAIL: jit.dg/test-sum-of-squares.c: test-sum-of-squares.c.exe.valgrind.txt: unsuppressed errors: 1 +(...other results...) + +$ less testsuite/jit/test-sum-of-squares.c.exe.valgrind.txt +(...shows full valgrind report for this test case...) +@end example + +When running under valgrind, it’s best to have configured gcc with +@code{--enable-valgrind-annotations}, which automatically suppresses +various known false positives. + +@node Environment variables,Packaging notes,Running the test suite,Internals +@anchor{internals/index environment-variables}@anchor{3c3} +@section Environment variables + + +When running client code against a locally-built libgccjit, three +environment variables need to be set up: + +@geindex environment variable; LD_LIBRARY_PATH +@anchor{internals/index envvar-LD_LIBRARY_PATH}@anchor{3c4} +@deffn {Environment Variable} LD_LIBRARY_PATH + +@quotation + +@cite{libgccjit.so} is dynamically linked into client code, so if running +against a locally-built library, @code{LD_LIBRARY_PATH} needs to be set +up appropriately. The library can be found within the “gcc” +subdirectory of the build tree: +@end quotation + +@example +$ file libgccjit.so* +libgccjit.so: symbolic link to `libgccjit.so.0' +libgccjit.so.0: symbolic link to `libgccjit.so.0.0.1' +libgccjit.so.0.0.1: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, not stripped +@end example +@end deffn + +@geindex environment variable; PATH +@anchor{internals/index envvar-PATH}@anchor{3c5} +@deffn {Environment Variable} PATH + +The library uses a driver executable for converting from .s assembler +files to .so shared libraries. Specifically, it looks for a name +expanded from +@code{$@{target_noncanonical@}-gcc-$@{gcc_BASEVER@}$@{exeext@}} +such as @code{x86_64-unknown-linux-gnu-gcc-5.0.0}. + +Hence @code{PATH} needs to include a directory where the library can +locate this executable. + +The executable is normally installed to the installation bindir +(e.g. /usr/bin), but a copy is also created within the “gcc” +subdirectory of the build tree for running the testsuite, and for ease +of development. +@end deffn + +@geindex environment variable; LIBRARY_PATH +@anchor{internals/index envvar-LIBRARY_PATH}@anchor{3c6} +@deffn {Environment Variable} LIBRARY_PATH + +The driver executable invokes the linker, and the latter needs to locate +support libraries needed by the generated code, or you will see errors +like: + +@example +ld: cannot find crtbeginS.o: No such file or directory +ld: cannot find -lgcc +ld: cannot find -lgcc_s +@end example + +Hence if running directly from a locally-built copy (without installing), +@code{LIBRARY_PATH} needs to contain the “gcc” subdirectory of the build +tree. +@end deffn + +For example, to run a binary that uses the library against a non-installed +build of the library in LIBGCCJIT_BUILD_DIR you need an invocation of the +client code like this, to preprend the dir to each of the environment +variables: + +@example +$ LD_LIBRARY_PATH=$(LIBGCCJIT_BUILD_DIR):$(LD_LIBRARY_PATH) \ + PATH=$(LIBGCCJIT_BUILD_DIR):$(PATH) \ + LIBRARY_PATH=$(LIBGCCJIT_BUILD_DIR):$(LIBRARY_PATH) \ + ./jit-hello-world +hello world +@end example + +@node Packaging notes,Overview of code structure,Environment variables,Internals +@anchor{internals/index packaging-notes}@anchor{3c7} +@section Packaging notes + + +The configure-time option @ref{3bd,,--enable-host-shared} is needed when +building the jit in order to get position-independent code. This will +slow down the regular compiler by a few percent. Hence when packaging gcc +with libgccjit, please configure and build twice: + +@quotation + + +@itemize * + +@item +once without @ref{3bd,,--enable-host-shared} for most languages, and + +@item +once with @ref{3bd,,--enable-host-shared} for the jit +@end itemize +@end quotation + +For example: + +@example +# Configure and build with --enable-host-shared +# for the jit: +mkdir configuration-for-jit +pushd configuration-for-jit +$(SRCDIR)/configure \ + --enable-host-shared \ + --enable-languages=jit \ + --prefix=$(DESTDIR) +make +popd + +# Configure and build *without* --enable-host-shared +# for maximum speed: +mkdir standard-configuration +pushd standard-configuration +$(SRCDIR)/configure \ + --enable-languages=all \ + --prefix=$(DESTDIR) +make +popd + +# Both of the above are configured to install to $(DESTDIR) +# Install the configuration with --enable-host-shared first +# *then* the one without, so that the faster build +# of "cc1" et al overwrites the slower build. +pushd configuration-for-jit +make install +popd + +pushd standard-configuration +make install +popd +@end example + +@node Overview of code structure,Design notes,Packaging notes,Internals +@anchor{internals/index overview-of-code-structure}@anchor{3c8} +@section Overview of code structure + + +The library is implemented in C++. The source files have the @code{.c} +extension for legacy reasons. + + +@itemize * + +@item +@code{libgccjit.cc} implements the API entrypoints. It performs error +checking, then calls into classes of the gcc::jit::recording namespace +within @code{jit-recording.cc} and @code{jit-recording.h}. + +@item +The gcc::jit::recording classes (within @code{jit-recording.cc} and +@code{jit-recording.h}) record the API calls that are made: + +@quotation + +@example + + /* Indentation indicates inheritance: */ + class context; + class memento; + class string; + class location; + class type; + class function_type; + class compound_type; + class struct_; + class union_; + class vector_type; + class field; + class bitfield; + class fields; + class function; + class block; + class rvalue; + class lvalue; + class local; + class global; + class param; + class base_call; + class function_pointer; + class statement; + class extended_asm; + class case_; + class top_level_asm; + +@end example +@end quotation + +@item +When the context is compiled, the gcc::jit::playback classes (within +@code{jit-playback.cc} and @code{jit-playback.h}) replay the API calls +within langhook:parse_file: + +@quotation + +@example + + /* Indentation indicates inheritance: */ + class context; + class wrapper; + class type; + class compound_type; + class field; + class function; + class block; + class rvalue; + class lvalue; + class param; + class source_file; + class source_line; + class location; + class case_; + +@end example + +@example +Client Code . Generated . libgccjit.so + . code . + . . JIT API . JIT "Frontend". (libbackend.a) +.................................................................................... + │ . . . . + ──────────────────────────> . . + . . │ . . + . . V . . + . . ──> libgccjit.cc . + . . │ (error-checking). + . . │ . + . . ──> jit-recording.cc + . . (record API calls) + . . <─────── . + . . │ . . + <─────────────────────────── . . + │ . . . . + │ . . . . + V . . gcc_jit_context_compile . + ──────────────────────────> . . + . . │ start of recording::context::compile () + . . │ . . + . . │ start of playback::context::compile () + . . │ (create tempdir) . + . . │ . . + . . │ ACQUIRE MUTEX . + . . │ . . + . . V───────────────────────> toplev::main (for now) + . . . . │ + . . . . (various code) + . . . . │ + . . . . V + . . . <───────────────── langhook:parse_file + . . . │ . + . . . │ (jit_langhook_parse_file) + . . . │ . +..........................................│..................VVVVVVVVVVVVV... + . . . │ . No GC in here + . . . │ jit-playback.cc + . . . │ (playback of API calls) + . . . ───────────────> creation of functions, + . . . . types, expression trees + . . . <──────────────── etc + . . . │(handle_locations: add locations to + . . . │ linemap and associate them with trees) + . . . │ . + . . . │ . No GC in here +..........................................│..................AAAAAAAAAAAAA... + . . . │ for each function + . . . ──> postprocess + . . . │ . + . . . ────────────> cgraph_finalize_function + . . . <──────────── + . . . <── . + . . . │ . + . . . ──────────────────> (end of + . . . . │ langhook_parse_file) + . . . . │ + . . . . (various code) + . . . . │ + . . . . ↓ + . . . <───────────────── langhook:write_globals + . . . │ . + . . . │ (jit_langhook_write_globals) + . . . │ . + . . . │ . + . . . ──────────────────> finalize_compilation_unit + . . . . │ + . . . . (the middle─end and backend) + . . . . ↓ + . . <───────────────────────────── end of toplev::main + . . │ . . + . . V───────────────────────> toplev::finalize + . . . . │ (purge internal state) + . . <──────────────────────── end of toplev::finalize + . . │ . . + . . V─> playback::context::postprocess: + . . │ . . + . . │ (assuming an in-memory compile): + . . │ . . + . . --> Convert assembler to DSO, via embedded + . . copy of driver: + . . driver::main () + . . invocation of "as" + . . invocation of "ld" + . . driver::finalize () + . . <---- + . . │ . . + . . │ . Load DSO (dlopen "fake.so") + . . │ . . + . . │ . Bundle it up in a jit::result + . . <── . . + . . │ . . + . . │ RELEASE MUTEX . + . . │ . . + . . │ end of playback::context::compile () + . . │ . . + . . │ playback::context dtor + . . ──> . . + . . │ Normally we cleanup the tempdir here: + . . │ ("fake.so" is unlinked from the + . . │ filesystem at this point) + . . │ If the client code requested debuginfo, the + . . │ cleanup happens later (in gcc_jit_result_release) + . . │ to make it easier on the debugger (see PR jit/64206) + . . <── . . + . . │ . . + . . │ end of recording::context::compile () + <─────────────────────────── . . + │ . . . . + V . . gcc_jit_result_get_code . + ──────────────────────────> . . + . . │ dlsym () within loaded DSO + <─────────────────────────── . . + Get (void*). . . . + │ . . . . + │ Call it . . . . + ───────────────> . . . + . │ . . . + . │ . . . + <─────────────── . . . + │ . . . . +etc│ . . . . + │ . . . . + V . . gcc_jit_result_release . + ──────────────────────────> . . + . . │ dlclose () the loaded DSO + . . │ (code becomes uncallable) + . . │ . . + . . │ If the client code requested debuginfo, then + . . │ cleanup of the tempdir was delayed. + . . │ If that was the case, clean it up now. + <─────────────────────────── . . + │ . . . . +@end example +@end quotation +@end itemize + +Here is a high-level summary from @code{jit-common.h}: + +@quotation + +In order to allow jit objects to be usable outside of a compile +whilst working with the existing structure of GCC’s code the +C API is implemented in terms of a gcc::jit::recording::context, +which records the calls made to it. + +When a gcc_jit_context is compiled, the recording context creates a +playback context. The playback context invokes the bulk of the GCC +code, and within the “frontend” parsing hook, plays back the recorded +API calls, creating GCC tree objects. + +So there are two parallel families of classes: those relating to +recording, and those relating to playback: + + +@itemize * + +@item +Visibility: recording objects are exposed back to client code, +whereas playback objects are internal to the library. + +@item +Lifetime: recording objects have a lifetime equal to that of the +recording context that created them, whereas playback objects only +exist within the frontend hook. + +@item +Memory allocation: recording objects are allocated by the recording +context, and automatically freed by it when the context is released, +whereas playback objects are allocated within the GC heap, and +garbage-collected; they can own GC-references. + +@item +Integration with rest of GCC: recording objects are unrelated to the +rest of GCC, whereas playback objects are wrappers around “tree” +instances. Hence you can’t ask a recording rvalue or lvalue what its +type is, whereas you can for a playback rvalue of lvalue (since it +can work with the underlying GCC tree nodes). + +@item +Instancing: There can be multiple recording contexts “alive” at once +(albeit it only one compiling at once), whereas there can only be one +playback context alive at one time (since it interacts with the GC). +@end itemize + +Ultimately if GCC could support multiple GC heaps and contexts, and +finer-grained initialization, then this recording vs playback +distinction could be eliminated. + +During a playback, we associate objects from the recording with +their counterparts during this playback. For simplicity, we store this +within the recording objects, as @code{void *m_playback_obj}, casting it to +the appropriate playback object subclass. For these casts to make +sense, the two class hierarchies need to have the same structure. + +Note that the playback objects that @code{m_playback_obj} points to are +GC-allocated, but the recording objects don’t own references: +these associations only exist within a part of the code where +the GC doesn’t collect, and are set back to NULL before the GC can +run. +@end quotation +@anchor{internals/index example-of-log-file}@anchor{5c} +Another way to understand the structure of the code is to enable logging, +via @ref{5b,,gcc_jit_context_set_logfile()}. Here is an example of a log +generated via this call: + +@example +JIT: libgccjit (GCC) version 6.0.0 20150803 (experimental) (x86_64-pc-linux-gnu) +JIT: compiled by GNU C version 4.8.3 20140911 (Red Hat 4.8.3-7), GMP version 5.1.2, MPFR version 3.1.2, MPC version 1.0.1 +JIT: entering: gcc_jit_context_set_str_option +JIT: GCC_JIT_STR_OPTION_PROGNAME: "./test-hello-world.c.exe" +JIT: exiting: gcc_jit_context_set_str_option +JIT: entering: gcc_jit_context_set_int_option +JIT: GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL: 3 +JIT: exiting: gcc_jit_context_set_int_option +JIT: entering: gcc_jit_context_set_bool_option +JIT: GCC_JIT_BOOL_OPTION_DEBUGINFO: true +JIT: exiting: gcc_jit_context_set_bool_option +JIT: entering: gcc_jit_context_set_bool_option +JIT: GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE: false +JIT: exiting: gcc_jit_context_set_bool_option +JIT: entering: gcc_jit_context_set_bool_option +JIT: GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE: false +JIT: exiting: gcc_jit_context_set_bool_option +JIT: entering: gcc_jit_context_set_bool_option +JIT: GCC_JIT_BOOL_OPTION_SELFCHECK_GC: true +JIT: exiting: gcc_jit_context_set_bool_option +JIT: entering: gcc_jit_context_set_bool_option +JIT: GCC_JIT_BOOL_OPTION_DUMP_SUMMARY: false +JIT: exiting: gcc_jit_context_set_bool_option +JIT: entering: gcc_jit_context_get_type +JIT: exiting: gcc_jit_context_get_type +JIT: entering: gcc_jit_context_get_type +JIT: exiting: gcc_jit_context_get_type +JIT: entering: gcc_jit_context_new_param +JIT: exiting: gcc_jit_context_new_param +JIT: entering: gcc_jit_context_new_function +JIT: exiting: gcc_jit_context_new_function +JIT: entering: gcc_jit_context_new_param +JIT: exiting: gcc_jit_context_new_param +JIT: entering: gcc_jit_context_get_type +JIT: exiting: gcc_jit_context_get_type +JIT: entering: gcc_jit_context_new_function +JIT: exiting: gcc_jit_context_new_function +JIT: entering: gcc_jit_context_new_string_literal +JIT: exiting: gcc_jit_context_new_string_literal +JIT: entering: gcc_jit_function_new_block +JIT: exiting: gcc_jit_function_new_block +JIT: entering: gcc_jit_block_add_comment +JIT: exiting: gcc_jit_block_add_comment +JIT: entering: gcc_jit_context_new_call +JIT: exiting: gcc_jit_context_new_call +JIT: entering: gcc_jit_block_add_eval +JIT: exiting: gcc_jit_block_add_eval +JIT: entering: gcc_jit_block_end_with_void_return +JIT: exiting: gcc_jit_block_end_with_void_return +JIT: entering: gcc_jit_context_dump_reproducer_to_file +JIT: entering: void gcc::jit::recording::context::dump_reproducer_to_file(const char*) +JIT: exiting: void gcc::jit::recording::context::dump_reproducer_to_file(const char*) +JIT: exiting: gcc_jit_context_dump_reproducer_to_file +JIT: entering: gcc_jit_context_compile +JIT: in-memory compile of ctxt: 0x1283e20 +JIT: entering: gcc::jit::result* gcc::jit::recording::context::compile() +JIT: GCC_JIT_STR_OPTION_PROGNAME: "./test-hello-world.c.exe" +JIT: GCC_JIT_INT_OPTION_OPTIMIZATION_LEVEL: 3 +JIT: GCC_JIT_BOOL_OPTION_DEBUGINFO: true +JIT: GCC_JIT_BOOL_OPTION_DUMP_INITIAL_TREE: false +JIT: GCC_JIT_BOOL_OPTION_DUMP_INITIAL_GIMPLE: false +JIT: GCC_JIT_BOOL_OPTION_DUMP_GENERATED_CODE: false +JIT: GCC_JIT_BOOL_OPTION_DUMP_SUMMARY: false +JIT: GCC_JIT_BOOL_OPTION_DUMP_EVERYTHING: false +JIT: GCC_JIT_BOOL_OPTION_SELFCHECK_GC: true +JIT: GCC_JIT_BOOL_OPTION_KEEP_INTERMEDIATES: false +JIT: gcc_jit_context_set_bool_allow_unreachable_blocks: false +JIT: gcc_jit_context_set_bool_use_external_driver: false +JIT: entering: void gcc::jit::recording::context::validate() +JIT: exiting: void gcc::jit::recording::context::validate() +JIT: entering: gcc::jit::playback::context::context(gcc::jit::recording::context*) +JIT: exiting: gcc::jit::playback::context::context(gcc::jit::recording::context*) +JIT: entering: gcc::jit::playback::compile_to_memory::compile_to_memory(gcc::jit::recording::context*) +JIT: exiting: gcc::jit::playback::compile_to_memory::compile_to_memory(gcc::jit::recording::context*) +JIT: entering: void gcc::jit::playback::context::compile() +JIT: entering: gcc::jit::tempdir::tempdir(gcc::jit::logger*, int) +JIT: exiting: gcc::jit::tempdir::tempdir(gcc::jit::logger*, int) +JIT: entering: bool gcc::jit::tempdir::create() +JIT: m_path_template: /tmp/libgccjit-XXXXXX +JIT: m_path_tempdir: /tmp/libgccjit-CKq1M9 +JIT: exiting: bool gcc::jit::tempdir::create() +JIT: entering: void gcc::jit::playback::context::acquire_mutex() +JIT: exiting: void gcc::jit::playback::context::acquire_mutex() +JIT: entering: void gcc::jit::playback::context::make_fake_args(vec*, const char*, vec*) +JIT: reusing cached configure-time options +JIT: configure_time_options[0]: -mtune=generic +JIT: configure_time_options[1]: -march=x86-64 +JIT: exiting: void gcc::jit::playback::context::make_fake_args(vec*, const char*, vec*) +JIT: entering: toplev::main +JIT: argv[0]: ./test-hello-world.c.exe +JIT: argv[1]: /tmp/libgccjit-CKq1M9/fake.c +JIT: argv[2]: -fPIC +JIT: argv[3]: -O3 +JIT: argv[4]: -g +JIT: argv[5]: -quiet +JIT: argv[6]: --param +JIT: argv[7]: ggc-min-expand=0 +JIT: argv[8]: --param +JIT: argv[9]: ggc-min-heapsize=0 +JIT: argv[10]: -mtune=generic +JIT: argv[11]: -march=x86-64 +JIT: entering: bool jit_langhook_init() +JIT: exiting: bool jit_langhook_init() +JIT: entering: void gcc::jit::playback::context::replay() +JIT: entering: void gcc::jit::recording::context::replay_into(gcc::jit::replayer*) +JIT: exiting: void gcc::jit::recording::context::replay_into(gcc::jit::replayer*) +JIT: entering: void gcc::jit::recording::context::disassociate_from_playback() +JIT: exiting: void gcc::jit::recording::context::disassociate_from_playback() +JIT: entering: void gcc::jit::playback::context::handle_locations() +JIT: exiting: void gcc::jit::playback::context::handle_locations() +JIT: entering: void gcc::jit::playback::function::build_stmt_list() +JIT: exiting: void gcc::jit::playback::function::build_stmt_list() +JIT: entering: void gcc::jit::playback::function::build_stmt_list() +JIT: exiting: void gcc::jit::playback::function::build_stmt_list() +JIT: entering: void gcc::jit::playback::function::postprocess() +JIT: exiting: void gcc::jit::playback::function::postprocess() +JIT: entering: void gcc::jit::playback::function::postprocess() +JIT: exiting: void gcc::jit::playback::function::postprocess() +JIT: exiting: void gcc::jit::playback::context::replay() +JIT: exiting: toplev::main +JIT: entering: void gcc::jit::playback::context::extract_any_requested_dumps(vec*) +JIT: exiting: void gcc::jit::playback::context::extract_any_requested_dumps(vec*) +JIT: entering: toplev::finalize +JIT: exiting: toplev::finalize +JIT: entering: virtual void gcc::jit::playback::compile_to_memory::postprocess(const char*) +JIT: entering: void gcc::jit::playback::context::convert_to_dso(const char*) +JIT: entering: void gcc::jit::playback::context::invoke_driver(const char*, const char*, const char*, timevar_id_t, bool, bool) +JIT: entering: void gcc::jit::playback::context::add_multilib_driver_arguments(vec*) +JIT: exiting: void gcc::jit::playback::context::add_multilib_driver_arguments(vec*) +JIT: argv[0]: x86_64-unknown-linux-gnu-gcc-6.0.0 +JIT: argv[1]: -m64 +JIT: argv[2]: -shared +JIT: argv[3]: /tmp/libgccjit-CKq1M9/fake.s +JIT: argv[4]: -o +JIT: argv[5]: /tmp/libgccjit-CKq1M9/fake.so +JIT: argv[6]: -fno-use-linker-plugin +JIT: entering: void gcc::jit::playback::context::invoke_embedded_driver(const vec*) +JIT: exiting: void gcc::jit::playback::context::invoke_embedded_driver(const vec*) +JIT: exiting: void gcc::jit::playback::context::invoke_driver(const char*, const char*, const char*, timevar_id_t, bool, bool) +JIT: exiting: void gcc::jit::playback::context::convert_to_dso(const char*) +JIT: entering: gcc::jit::result* gcc::jit::playback::context::dlopen_built_dso() +JIT: GCC_JIT_BOOL_OPTION_DEBUGINFO was set: handing over tempdir to jit::result +JIT: entering: gcc::jit::result::result(gcc::jit::logger*, void*, gcc::jit::tempdir*) +JIT: exiting: gcc::jit::result::result(gcc::jit::logger*, void*, gcc::jit::tempdir*) +JIT: exiting: gcc::jit::result* gcc::jit::playback::context::dlopen_built_dso() +JIT: exiting: virtual void gcc::jit::playback::compile_to_memory::postprocess(const char*) +JIT: entering: void gcc::jit::playback::context::release_mutex() +JIT: exiting: void gcc::jit::playback::context::release_mutex() +JIT: exiting: void gcc::jit::playback::context::compile() +JIT: entering: gcc::jit::playback::context::~context() +JIT: exiting: gcc::jit::playback::context::~context() +JIT: exiting: gcc::jit::result* gcc::jit::recording::context::compile() +JIT: gcc_jit_context_compile: returning (gcc_jit_result *)0x12f75d0 +JIT: exiting: gcc_jit_context_compile +JIT: entering: gcc_jit_result_get_code +JIT: locating fnname: hello_world +JIT: entering: void* gcc::jit::result::get_code(const char*) +JIT: exiting: void* gcc::jit::result::get_code(const char*) +JIT: gcc_jit_result_get_code: returning (void *)0x7ff6b8cd87f0 +JIT: exiting: gcc_jit_result_get_code +JIT: entering: gcc_jit_context_release +JIT: deleting ctxt: 0x1283e20 +JIT: entering: gcc::jit::recording::context::~context() +JIT: exiting: gcc::jit::recording::context::~context() +JIT: exiting: gcc_jit_context_release +JIT: entering: gcc_jit_result_release +JIT: deleting result: 0x12f75d0 +JIT: entering: virtual gcc::jit::result::~result() +JIT: entering: gcc::jit::tempdir::~tempdir() +JIT: unlinking .s file: /tmp/libgccjit-CKq1M9/fake.s +JIT: unlinking .so file: /tmp/libgccjit-CKq1M9/fake.so +JIT: removing tempdir: /tmp/libgccjit-CKq1M9 +JIT: exiting: gcc::jit::tempdir::~tempdir() +JIT: exiting: virtual gcc::jit::result::~result() +JIT: exiting: gcc_jit_result_release +JIT: gcc::jit::logger::~logger() +@end example + +@node Design notes,Submitting patches,Overview of code structure,Internals +@anchor{internals/index design-notes}@anchor{3c9} +@section Design notes + + +It should not be possible for client code to cause an internal compiler +error. If this @emph{does} happen, the root cause should be isolated (perhaps +using @ref{5d,,gcc_jit_context_dump_reproducer_to_file()}) and the cause +should be rejected via additional checking. The checking ideally should +be within the libgccjit API entrypoints in libgccjit.cc, since this is as +close as possible to the error; failing that, a good place is within +@code{recording::context::validate ()} in jit-recording.cc. + +@node Submitting patches,,Design notes,Internals +@anchor{internals/index submitting-patches}@anchor{3ca} +@section Submitting patches + + +Please read the contribution guidelines for gcc at +@indicateurl{https://gcc.gnu.org/contribute.html}. + +Patches for the jit should be sent to both the +@email{gcc-patches@@gcc.gnu.org} and @email{jit@@gcc.gnu.org} mailing lists, +with “jit” and “PATCH” in the Subject line. + +You don’t need to do a full bootstrap for code that just touches the +@code{jit} and @code{testsuite/jit.dg} subdirectories. However, please run +@code{make check-jit} before submitting the patch, and mention the results +in your email (along with the host triple that the tests were run on). + +A good patch should contain the information listed in the +gcc contribution guide linked to above; for a @code{jit} patch, the patch +shold contain: + +@quotation + + +@itemize * + +@item +the code itself (for example, a new API entrypoint will typically +touch @code{libgccjit.h} and @code{.c}, along with support code in +@code{jit-recording.[ch]} and @code{jit-playback.[ch]} as appropriate) + +@item +test coverage + +@item +documentation for the C API + +@item +documentation for the C++ API +@end itemize +@end quotation + +A patch that adds new API entrypoints should also contain: + +@quotation + + +@itemize * + +@item +a feature macro in @code{libgccjit.h} so that client code that doesn’t +use a “configure” mechanism can still easily detect the presence of +the entrypoint. See e.g. @code{LIBGCCJIT_HAVE_SWITCH_STATEMENTS} (for +a category of entrypoints) and +@code{LIBGCCJIT_HAVE_gcc_jit_context_set_bool_allow_unreachable_blocks} +(for an individual entrypoint). + +@item +a new ABI tag containing the new symbols (in @code{libgccjit.map}), so +that we can detect client code that uses them + +@item +Support for @ref{5d,,gcc_jit_context_dump_reproducer_to_file()}. Most +jit testcases attempt to dump their contexts to a .c file; @code{jit.exp} +then sanity-checks the generated c by compiling them (though +not running them). A new API entrypoint +needs to “know” how to write itself back out to C (by implementing +@code{gcc::jit::recording::memento::write_reproducer} for the appropriate +@code{memento} subclass). + +@item +C++ bindings for the new entrypoints (see @code{libgccjit++.h}); ideally +with test coverage, though the C++ API test coverage is admittedly +spotty at the moment + +@item +documentation for the new C entrypoints + +@item +documentation for the new C++ entrypoints + +@item +documentation for the new ABI tag (see @code{topics/compatibility.rst}). +@end itemize +@end quotation + +Depending on the patch you can either extend an existing test case, or +add a new test case. If you add an entirely new testcase: @code{jit.exp} +expects jit testcases to begin with @code{test-}, or @code{test-error-} (for a +testcase that generates an error on a @ref{8,,gcc_jit_context}). + +Every new testcase that doesn’t generate errors should also touch +@code{gcc/testsuite/jit.dg/all-non-failing-tests.h}: + +@quotation + + +@itemize * + +@item +Testcases that don’t generate errors should ideally be added to the +@code{testcases} array in that file; this means that, in addition +to being run standalone, they also get run within +@code{test-combination.c} (which runs all successful tests inside one +big @ref{8,,gcc_jit_context}), and @code{test-threads.c} (which runs all +successful tests in one process, each one running in a different +thread on a different @ref{8,,gcc_jit_context}). + +@cartouche +@quotation Note +Given that exported functions within a @ref{8,,gcc_jit_context} +must have unique names, and most testcases are run within +@code{test-combination.c}, this means that every jit-compiled test +function typically needs a name that’s unique across the entire +test suite. +@end quotation +@end cartouche + +@item +Testcases that aren’t to be added to the @code{testcases} array should +instead add a comment to the file clarifying why they’re not in that +array. See the file for examples. +@end itemize +@end quotation + +Typically a patch that touches the .rst documentation will also need the +texinfo to be regenerated. You can do this with +Sphinx 1.0@footnote{https://sphinx-doc.org/} or later by +running @code{make texinfo} within @code{SRCDIR/gcc/jit/docs}. Don’t do this +within the patch sent to the mailing list; it can often be relatively +large and inconsequential (e.g. anchor renumbering), rather like generated +“configure” changes from configure.ac. You can regenerate it when +committing to svn. + +@node Indices and tables,Index,Internals,Top +@anchor{index indices-and-tables}@anchor{3cb} +@unnumbered Indices and tables + + + +@itemize * + +@item +genindex + +@item +modindex + +@item +search +@end itemize + +@c Some notes: +@c +@c The Sphinx C domain appears to lack explicit support for enum values, +@c so I've been using :c:macro: for them. +@c +@c See https://sphinx-doc.org/domains.html#the-c-domain + +@node Index,,Indices and tables,Top +@unnumbered Index + + +@printindex ge + + +@c %**end of body +@bye diff --git a/gcc/jit/docs/conf.py b/gcc/jit/docs/conf.py new file mode 100644 index 000000000000..062232ae280a --- /dev/null +++ b/gcc/jit/docs/conf.py @@ -0,0 +1,261 @@ +# -*- coding: utf-8 -*- +# +# libgccjit documentation build configuration file, created by +# sphinx-quickstart on Wed Jul 30 13:39:01 2014. +# +# This file is execfile()d with the current directory set to its containing dir. +# +# Note that not all possible configuration values are present in this +# autogenerated file. +# +# All configuration values have a default; values that are commented out +# serve to show the default. + +import sys, os + +# If extensions (or modules to document with autodoc) are in another directory, +# add these directories to sys.path here. If the directory is relative to the +# documentation root, use os.path.abspath to make it absolute, like shown here. +#sys.path.insert(0, os.path.abspath('.')) + +# -- General configuration ----------------------------------------------------- + +# If your documentation needs a minimal Sphinx version, state it here. +#needs_sphinx = '1.0' + +# Add any Sphinx extension module names here, as strings. They can be extensions +# coming with Sphinx (named 'sphinx.ext.*') or your custom ones. +extensions = [] + +# Add any paths that contain templates here, relative to this directory. +templates_path = ['_templates'] + +# The suffix of source filenames. +source_suffix = '.rst' + +# The encoding of source files. +#source_encoding = 'utf-8-sig' + +# The master toctree document. +master_doc = 'index' + +# c:type directive is supported since 3.0 +needs_sphinx = '3.0' + +# General information about the project. +project = u'libgccjit' +copyright = u'2014-2022 Free Software Foundation, Inc.' + +# GCC-specific: extract version information from "gcc" src subdir for +# use in "version" and "release" below. +def __read_file(name): + gcc_srcdir = '../..' + path = os.path.join(gcc_srcdir, name) + if os.path.exists(path): + return open(path).read().strip() + else: + return '' +gcc_BASEVER = __read_file('BASE-VER') +gcc_DEVPHASE = __read_file('DEV-PHASE') +gcc_DATESTAMP = __read_file('DATESTAMP') +gcc_REVISION = __read_file('REVISION') + +# The version info for the project you're documenting, acts as replacement for +# |version| and |release|, also used in various other places throughout the +# built documents. +# +# The short X.Y version. +version = gcc_BASEVER +# The full version, including alpha/beta/rc tags. +release = ('%s (%s %s%s)' + % (gcc_BASEVER, gcc_DEVPHASE, gcc_DATESTAMP, + (' %s' % gcc_REVISION) if gcc_REVISION else '')) + +# The language for content autogenerated by Sphinx. Refer to documentation +# for a list of supported languages. +#language = None + +# There are two options for replacing |today|: either, you set today to some +# non-false value, then it is used: +#today = '' +# Else, today_fmt is used as the format for a strftime call. +#today_fmt = '%B %d, %Y' + +# List of patterns, relative to source directory, that match files and +# directories to ignore when looking for source files. +exclude_patterns = ['_build'] + +# The reST default role (used for this markup: `text`) to use for all documents. +#default_role = None + +# If true, '()' will be appended to :func: etc. cross-reference text. +#add_function_parentheses = True + +# If true, the current module name will be prepended to all description +# unit titles (such as .. function::). +#add_module_names = True + +# If true, sectionauthor and moduleauthor directives will be shown in the +# output. They are ignored by default. +#show_authors = False + +# The name of the Pygments (syntax highlighting) style to use. +pygments_style = 'sphinx' + +# A list of ignored prefixes for module index sorting. +#modindex_common_prefix = [] + + +# -- Options for HTML output --------------------------------------------------- + +# The theme to use for HTML and HTML Help pages. See the documentation for +# a list of builtin themes. +html_theme = 'sphinxdoc' + +# Theme options are theme-specific and customize the look and feel of a theme +# further. For a list of options available for each theme, see the +# documentation. +#html_theme_options = {} + +# Add any paths that contain custom themes here, relative to this directory. +#html_theme_path = [] + +# The name for this set of Sphinx documents. If None, it defaults to +# " v documentation". +#html_title = None + +# A shorter title for the navigation bar. Default is the same as html_title. +#html_short_title = None + +# The name of an image file (relative to this directory) to place at the top +# of the sidebar. +#html_logo = None + +# The name of an image file (within the static path) to use as favicon of the +# docs. This file should be a Windows icon file (.ico) being 16x16 or 32x32 +# pixels large. +#html_favicon = None + +# Add any paths that contain custom static files (such as style sheets) here, +# relative to this directory. They are copied after the builtin static files, +# so a file named "default.css" will overwrite the builtin "default.css". +html_static_path = ['_static'] + +# If not '', a 'Last updated on:' timestamp is inserted at every page bottom, +# using the given strftime format. +#html_last_updated_fmt = '%b %d, %Y' + +# If true, SmartyPants will be used to convert quotes and dashes to +# typographically correct entities. +#html_use_smartypants = True + +# Custom sidebar templates, maps document names to template names. +#html_sidebars = {} + +# Additional templates that should be rendered to pages, maps page names to +# template names. +#html_additional_pages = {} + +# If false, no module index is generated. +#html_domain_indices = True + +# If false, no index is generated. +#html_use_index = True + +# If true, the index is split into individual pages for each letter. +#html_split_index = False + +# If true, links to the reST sources are added to the pages. +#html_show_sourcelink = True + +# If true, "Created using Sphinx" is shown in the HTML footer. Default is True. +#html_show_sphinx = True + +# If true, "(C) Copyright ..." is shown in the HTML footer. Default is True. +#html_show_copyright = True + +# If true, an OpenSearch description file will be output, and all pages will +# contain a tag referring to it. The value of this option must be the +# base URL from which the finished HTML is served. +#html_use_opensearch = '' + +# This is the file name suffix for HTML files (e.g. ".xhtml"). +#html_file_suffix = None + +# Output file base name for HTML help builder. +htmlhelp_basename = 'libgccjitdoc' + + +# -- Options for LaTeX output -------------------------------------------------- + +latex_elements = { +# The paper size ('letterpaper' or 'a4paper'). +#'papersize': 'letterpaper', + +# The font size ('10pt', '11pt' or '12pt'). +#'pointsize': '10pt', + +# Additional stuff for the LaTeX preamble. +#'preamble': '', +} + +# Grouping the document tree into LaTeX files. List of tuples +# (source start file, target name, title, author, documentclass [howto/manual]). +latex_documents = [ + ('index', 'libgccjit.tex', u'libgccjit Documentation', + u'David Malcolm', 'manual'), +] + +# The name of an image file (relative to this directory) to place at the top of +# the title page. +#latex_logo = None + +# For "manual" documents, if this is true, then toplevel headings are parts, +# not chapters. +#latex_use_parts = False + +# If true, show page references after internal links. +#latex_show_pagerefs = False + +# If true, show URL addresses after external links. +#latex_show_urls = False + +# Documents to append as an appendix to all manuals. +#latex_appendices = [] + +# If false, no module index is generated. +#latex_domain_indices = True + + +# -- Options for manual page output -------------------------------------------- + +# One entry per manual page. List of tuples +# (source start file, name, description, authors, manual section). +man_pages = [ + ('index', 'libgccjit', u'libgccjit Documentation', + [u'David Malcolm'], 1) +] + +# If true, show URL addresses after external links. +#man_show_urls = False + + +# -- Options for Texinfo output ------------------------------------------------ + +# Grouping the document tree into Texinfo files. List of tuples +# (source start file, target name, title, author, +# dir menu entry, description, category) +texinfo_documents = [ + ('index', 'libgccjit', u'libgccjit Documentation', + u'David Malcolm', 'libgccjit', 'GCC-based Just In Time compiler library.', + 'Miscellaneous'), +] + +# Documents to append as an appendix to all manuals. +#texinfo_appendices = [] + +# If false, no module index is generated. +#texinfo_domain_indices = True + +# How to display URL addresses: 'footnote', 'no', or 'inline'. +#texinfo_show_urls = 'footnote' diff --git a/gcc/jit/doc/cp/index.rst b/gcc/jit/docs/cp/index.rst similarity index 100% rename from gcc/jit/doc/cp/index.rst rename to gcc/jit/docs/cp/index.rst diff --git a/gcc/jit/doc/cp/intro/index.rst b/gcc/jit/docs/cp/intro/index.rst similarity index 100% rename from gcc/jit/doc/cp/intro/index.rst rename to gcc/jit/docs/cp/intro/index.rst diff --git a/gcc/jit/doc/cp/intro/tutorial01.rst b/gcc/jit/docs/cp/intro/tutorial01.rst similarity index 100% rename from gcc/jit/doc/cp/intro/tutorial01.rst rename to gcc/jit/docs/cp/intro/tutorial01.rst diff --git a/gcc/jit/doc/cp/intro/tutorial02.rst b/gcc/jit/docs/cp/intro/tutorial02.rst similarity index 100% rename from gcc/jit/doc/cp/intro/tutorial02.rst rename to gcc/jit/docs/cp/intro/tutorial02.rst diff --git a/gcc/jit/doc/cp/intro/tutorial03.rst b/gcc/jit/docs/cp/intro/tutorial03.rst similarity index 99% rename from gcc/jit/doc/cp/intro/tutorial03.rst rename to gcc/jit/docs/cp/intro/tutorial03.rst index 44544d7716d7..4061a6affc4b 100644 --- a/gcc/jit/doc/cp/intro/tutorial03.rst +++ b/gcc/jit/docs/cp/intro/tutorial03.rst @@ -111,7 +111,7 @@ an assignment: a value that can be computed somehow, and assigned *to* a storage area (such as a variable). It has a specific :type:`gccjit::type`. -Another important class is :type:`gccjit::lvalue`. +Anothe important class is :type:`gccjit::lvalue`. A :type:`gccjit::lvalue`. is something that can of the *left*-hand side of an assignment: a storage area (such as a variable). diff --git a/gcc/jit/doc/cp/intro/tutorial04.rst b/gcc/jit/docs/cp/intro/tutorial04.rst similarity index 100% rename from gcc/jit/doc/cp/intro/tutorial04.rst rename to gcc/jit/docs/cp/intro/tutorial04.rst diff --git a/gcc/jit/doc/cp/topics/asm.rst b/gcc/jit/docs/cp/topics/asm.rst similarity index 100% rename from gcc/jit/doc/cp/topics/asm.rst rename to gcc/jit/docs/cp/topics/asm.rst diff --git a/gcc/jit/doc/cp/topics/compilation.rst b/gcc/jit/docs/cp/topics/compilation.rst similarity index 100% rename from gcc/jit/doc/cp/topics/compilation.rst rename to gcc/jit/docs/cp/topics/compilation.rst diff --git a/gcc/jit/doc/cp/topics/contexts.rst b/gcc/jit/docs/cp/topics/contexts.rst similarity index 100% rename from gcc/jit/doc/cp/topics/contexts.rst rename to gcc/jit/docs/cp/topics/contexts.rst diff --git a/gcc/jit/doc/cp/topics/expressions.rst 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diff --git a/gcc/jit/doc/examples/tut04-toyvm/factorial.toy b/gcc/jit/docs/examples/tut04-toyvm/factorial.toy similarity index 100% rename from gcc/jit/doc/examples/tut04-toyvm/factorial.toy rename to gcc/jit/docs/examples/tut04-toyvm/factorial.toy diff --git a/gcc/jit/doc/examples/tut04-toyvm/fibonacci.toy b/gcc/jit/docs/examples/tut04-toyvm/fibonacci.toy similarity index 100% rename from gcc/jit/doc/examples/tut04-toyvm/fibonacci.toy rename to gcc/jit/docs/examples/tut04-toyvm/fibonacci.toy diff --git a/gcc/jit/doc/examples/tut04-toyvm/toyvm.c b/gcc/jit/docs/examples/tut04-toyvm/toyvm.c similarity index 100% rename from gcc/jit/doc/examples/tut04-toyvm/toyvm.c rename to gcc/jit/docs/examples/tut04-toyvm/toyvm.c diff --git a/gcc/jit/doc/examples/tut04-toyvm/toyvm.cc b/gcc/jit/docs/examples/tut04-toyvm/toyvm.cc similarity index 100% rename from gcc/jit/doc/examples/tut04-toyvm/toyvm.cc rename to gcc/jit/docs/examples/tut04-toyvm/toyvm.cc diff --git a/gcc/jit/doc/examples/tut05-bf.c 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a/gcc/jit/doc/intro/tutorial03.rst b/gcc/jit/docs/intro/tutorial03.rst similarity index 99% rename from gcc/jit/doc/intro/tutorial03.rst rename to gcc/jit/docs/intro/tutorial03.rst index ac158d259453..478ea2721de6 100644 --- a/gcc/jit/doc/intro/tutorial03.rst +++ b/gcc/jit/docs/intro/tutorial03.rst @@ -104,7 +104,7 @@ an assignment: a value that can be computed somehow, and assigned *to* a storage area (such as a variable). It has a specific :c:expr:`gcc_jit_type *`. -Another important class is :c:expr:`gcc_jit_lvalue *`. +Anothe important class is :c:expr:`gcc_jit_lvalue *`. A :c:expr:`gcc_jit_lvalue *`. is something that can of the *left*-hand side of an assignment: a storage area (such as a variable). diff --git a/gcc/jit/doc/intro/tutorial04.rst b/gcc/jit/docs/intro/tutorial04.rst similarity index 100% rename from gcc/jit/doc/intro/tutorial04.rst rename to gcc/jit/docs/intro/tutorial04.rst diff --git a/gcc/jit/doc/intro/tutorial05.rst b/gcc/jit/docs/intro/tutorial05.rst similarity index 100% rename from gcc/jit/doc/intro/tutorial05.rst rename to gcc/jit/docs/intro/tutorial05.rst diff --git a/gcc/jit/doc/topics/asm.rst b/gcc/jit/docs/topics/asm.rst similarity index 100% rename from gcc/jit/doc/topics/asm.rst rename to gcc/jit/docs/topics/asm.rst diff --git a/gcc/jit/doc/topics/compatibility.rst b/gcc/jit/docs/topics/compatibility.rst similarity index 100% rename from gcc/jit/doc/topics/compatibility.rst rename to gcc/jit/docs/topics/compatibility.rst diff --git a/gcc/jit/doc/topics/compilation.rst b/gcc/jit/docs/topics/compilation.rst similarity index 100% rename from gcc/jit/doc/topics/compilation.rst rename to gcc/jit/docs/topics/compilation.rst diff --git a/gcc/jit/doc/topics/contexts.rst b/gcc/jit/docs/topics/contexts.rst similarity index 100% rename from gcc/jit/doc/topics/contexts.rst rename to gcc/jit/docs/topics/contexts.rst diff --git a/gcc/jit/doc/topics/expressions.rst b/gcc/jit/docs/topics/expressions.rst similarity index 100% rename from gcc/jit/doc/topics/expressions.rst rename to gcc/jit/docs/topics/expressions.rst diff --git a/gcc/jit/doc/topics/function-pointers.rst b/gcc/jit/docs/topics/function-pointers.rst similarity index 100% rename from gcc/jit/doc/topics/function-pointers.rst rename to gcc/jit/docs/topics/function-pointers.rst diff --git a/gcc/jit/doc/topics/functions.rst b/gcc/jit/docs/topics/functions.rst similarity index 100% rename from gcc/jit/doc/topics/functions.rst rename to gcc/jit/docs/topics/functions.rst diff --git a/gcc/jit/doc/topics/index.rst b/gcc/jit/docs/topics/index.rst similarity index 100% rename from gcc/jit/doc/topics/index.rst rename to gcc/jit/docs/topics/index.rst diff --git a/gcc/jit/doc/topics/locations.rst b/gcc/jit/docs/topics/locations.rst similarity index 100% rename from gcc/jit/doc/topics/locations.rst rename to gcc/jit/docs/topics/locations.rst diff --git a/gcc/jit/doc/topics/objects.rst b/gcc/jit/docs/topics/objects.rst similarity index 100% rename from gcc/jit/doc/topics/objects.rst rename to gcc/jit/docs/topics/objects.rst diff --git a/gcc/jit/doc/topics/performance.rst b/gcc/jit/docs/topics/performance.rst similarity index 100% rename from gcc/jit/doc/topics/performance.rst rename to gcc/jit/docs/topics/performance.rst diff --git a/gcc/jit/doc/topics/types.rst b/gcc/jit/docs/topics/types.rst similarity index 100% rename from gcc/jit/doc/topics/types.rst rename to gcc/jit/docs/topics/types.rst -- 2.47.2