gccrs: Improve feature handling

This includes a program, written using flex and bison, to extract
information on unstable features from rustc source code and save it to a
header file.

The script does fetch files from https://github.com/rust-lang/rust (the
official rustc git repository), which should be alright, as it's only
intended to be run by maintainers.

See https://doc.rust-lang.org/unstable-book/ for information on unstable
features.

gcc/rust/ChangeLog:

	* checks/errors/feature/rust-feature-gate.cc
	(FeatureGate::gate): Handle removal of Feature::create.
	(FeatureGate::visit): Refer to AUTO_TRAITS as
	OPTIN_BUILTIN_TRAITS.
	* checks/errors/feature/rust-feature.cc (Feature::create):
	Remove.
	(Feature::feature_list): New static member variable.
	(Feature::name_hash_map): Use "rust-feature-defs.h" to define.
	(Feature::lookup): New member function definition.
	* checks/errors/feature/rust-feature.h (Feature::State): Add
	comments.
	(Feature::Name): Use "rust-feature-defs.h" to define.
	(Feature::as_string): Make const.
	(Feature::name): Likewise.
	(Feature::state): Likewise.
	(Feature::issue): Likewise.
	(Feature::description): Remove member function declaration.
	(Feature::create): Remove static member function declaration.
	(Feature::lookup): New member function declarations.
	(Feature::Feature): Adjust arguments.
	(Feature::m_rustc_since): Rename to...
	(Feature::m_rust_since): ...here.
	(Feature::m_description): Remove.
	(Feature::m_reason): New member variable.
	(Feature::feature_list): New static member variable.
	* checks/errors/feature/rust-feature-defs.h: New file.
	* checks/errors/feature/contrib/parse.y: New file.
	* checks/errors/feature/contrib/scan.l: New file.
	* checks/errors/feature/contrib/.gitignore: New file.
	* checks/errors/feature/contrib/Makefile: New file.
	* checks/errors/feature/contrib/fetch: New file.
	* checks/errors/feature/contrib/regen: New file.
	* checks/errors/feature/contrib/copyright-stub.h: New file.
	* checks/errors/feature/contrib/README: New file.

Signed-off-by: Owen Avery <powerboat9.gamer@gmail.com>

diff --git a/gcc/rust/checks/errors/feature/contrib/.gitignore b/gcc/rust/checks/errors/feature/contrib/.gitignore
new file mode 100644 (file)
index 0000000..796b96d
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/.gitignore
@@ -0,0 +1 @@
+/build

diff --git a/gcc/rust/checks/errors/feature/contrib/Makefile b/gcc/rust/checks/errors/feature/contrib/Makefile
new file mode 100644 (file)
index 0000000..7c828ab
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/Makefile
@@ -0,0 +1,59 @@
+# Copyright (C) 2025 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
+# <http://www.gnu.org/licenses/>.
+
+OUT = ../rust-feature-defs.h
+
+all: $(OUT)
+
+mk-build-dir:
+       mkdir -p build
+
+build/parse.c: parse.y mk-build-dir
+       $(YACC) $(YFLAGS) -o $@ --defines=build/parse.h $<
+
+build/parse.h: build/parse.c;
+
+build/scan.c: scan.l
+       $(LEX) $(LFLAGS) -o $@ -Ca --header-file=build/scan.h $<
+
+build/scan.h: build/scan.c;
+
+build/%.o: build/%.c build/parse.h build/scan.h
+       $(CC) $(CFLAGS) -c -Ibuild -o $@ $<
+
+build/feature-extract: build/parse.o build/scan.o
+       $(CC) $(LDFLAGS) $(LDLIBS) -o $@ $^
+
+build/download.rs: fetch
+       ./$< $@
+
+$(OUT): build/feature-extract build/download.rs
+       # add copyright header + newline
+       echo | \
+           cat copyright-stub.h - | \
+           sed "s/YYYY/$$(date +%Y)/" > build/rust-feature-defs.h
+       cat build/download.rs | ./$< >> build/rust-feature-defs.h
+       clang-format -i build/rust-feature-defs.h \
+           --style=file:../../../../../../contrib/clang-format
+       mv build/rust-feature-defs.h $(OUT)
+
+clean:
+       $(RM) -r build
+
+clean-all: clean
+       $(RM) $(OUT)

diff --git a/gcc/rust/checks/errors/feature/contrib/README b/gcc/rust/checks/errors/feature/contrib/README
new file mode 100644 (file)
index 0000000..e85fe09
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/README
@@ -0,0 +1,3 @@
+This program is intended for use in generating rust-feature-defs.h
+
+To use, run `./regen`

diff --git a/gcc/rust/checks/errors/feature/contrib/copyright-stub.h b/gcc/rust/checks/errors/feature/contrib/copyright-stub.h
new file mode 100644 (file)
index 0000000..1a5f52c
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/copyright-stub.h
@@ -0,0 +1,19 @@
+// Copyright (C) YYYY 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
+// <http://www.gnu.org/licenses/>.
+
+// AUTO-GENERATED -- SEE LOCAL contrib SUBDIRECTORY

diff --git a/gcc/rust/checks/errors/feature/contrib/fetch b/gcc/rust/checks/errors/feature/contrib/fetch
new file mode 100755 (executable)
index 0000000..b26ed3c
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/fetch
@@ -0,0 +1,30 @@
+#!/bin/sh
+
+# Copyright (C) 2025 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
+# <http://www.gnu.org/licenses/>.
+
+RUST_VERSION="1.49.0"
+
+[ $# = 1 ] || exit 1
+
+# Fetches files from the official rustc git repository
+
+URL_PREFIX='https://raw.githubusercontent.com/rust-lang/rust/refs/tags'
+URL_TEMPLATE="$URL_PREFIX/$RUST_VERSION/compiler/rustc_feature/src"
+
+wget -O $1 "$URL_TEMPLATE"/{accepted,active,removed}.rs

diff --git a/gcc/rust/checks/errors/feature/contrib/parse.y b/gcc/rust/checks/errors/feature/contrib/parse.y
new file mode 100644 (file)
index 0000000..34c0138
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/parse.y
@@ -0,0 +1,143 @@
+/* Copyright (C) 2025 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
+<http://www.gnu.org/licenses/>.  */
+
+%{
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <ctype.h>
+
+int yylex (void);
+void yyerror (char const *);
+
+#include "scan.h"
+
+// expands to three %s parameters
+#define UNWRAP_OPT_STR(prefix, s) (s ? prefix "_SOME (" : prefix "_NONE"), (s ? s : ""), (s ? ")" : "")
+
+%}
+
+%union
+{
+  char *str;
+};
+
+%token <str> IDENT STR NUM
+%token SCOPE
+%token K_SOME K_NONE
+%token K_ACTIVE K_ACCEPTED K_REMOVED K_STABLE_REMOVED
+%token K_E_START K_E_2018
+
+%type <str> issue
+%type <str> edition
+%type <str> reason
+
+%%
+
+multi_database: multi_database database
+| database
+;
+
+database: '(' entry_list ')';
+
+entry_list: entry_list entry ','
+| entry ','
+;
+
+entry: '(' K_ACTIVE ',' IDENT ',' STR ',' issue ',' edition ')' {
+  char *ident_upper = strdup ($4);
+  for (size_t i = 0; ident_upper[i]; i++)
+    ident_upper[i] = toupper (ident_upper[i]);
+  printf ("FEATURE_ACTIVE (\"%s\", %s, %s, %s%s%s, EDITION_%s)\n", $4, ident_upper, $6, UNWRAP_OPT_STR ("ISSUE", $8), $10 ? $10 : "NONE");
+  free ($4);
+  free (ident_upper);
+  free ($6);
+  free ($8);
+}
+| '(' K_ACCEPTED ',' IDENT ',' STR ',' issue ',' K_NONE ')' {
+  char *ident_upper = strdup ($4);
+  for (size_t i = 0; ident_upper[i]; i++)
+    ident_upper[i] = toupper (ident_upper[i]);
+  printf ("FEATURE_ACCEPTED (\"%s\", %s, %s, %s%s%s)\n", $4, ident_upper, $6, UNWRAP_OPT_STR ("ISSUE", $8));
+  free ($4);
+  free (ident_upper);
+  free ($6);
+  free ($8);
+}
+| '(' K_REMOVED ',' IDENT ',' STR ',' issue ',' K_NONE ',' reason ')' {
+  char *ident_upper;
+  // HACK: convert no_debug to F_NO_DEBUG instead
+  // since NO_DEBUG is used as an unrelated macro
+  if (!strcmp ($4, "no_debug"))
+    {
+      ident_upper = strdup ("F_NO_DEBUG");
+    }
+  else
+    {
+      ident_upper = strdup ($4);
+      for (size_t i = 0; ident_upper[i]; i++)
+        ident_upper[i] = toupper (ident_upper[i]);
+    }
+  printf ("FEATURE_REMOVED (\"%s\", %s, %s, %s%s%s, %s%s%s)\n", $4, ident_upper, $6, UNWRAP_OPT_STR ("ISSUE", $8), UNWRAP_OPT_STR ("REASON", $12));
+  free ($4);
+  free (ident_upper);
+  free ($6);
+  free ($8);
+  free ($12);
+}
+| '(' K_STABLE_REMOVED ',' IDENT ',' STR ',' issue ',' K_NONE ')' {
+  char *ident_upper = strdup ($4);
+  for (size_t i = 0; ident_upper[i]; i++)
+    ident_upper[i] = toupper (ident_upper[i]);
+  printf ("FEATURE_STABLE_REMOVED (\"%s\", %s, %s, %s%s%s)\n", $4, ident_upper, $6, UNWRAP_OPT_STR ("ISSUE", $8));
+  free ($4);
+  free (ident_upper);
+  free ($6);
+  free ($8);
+}
+;
+
+issue: K_SOME '(' NUM ')' { $$ = $3; }
+| K_NONE { $$ = NULL; }
+;
+
+/* TODO: expand this as needed */
+edition: K_NONE { $$ = NULL; }
+| K_SOME '(' K_E_START SCOPE K_E_2018 ')' { $$ = "2018"; }
+;
+
+reason: K_SOME '(' STR ')' { $$ = $3; }
+| K_NONE { $$ = NULL; }
+;
+
+%%
+
+void yyerror (const char *msg)
+{
+  fprintf (stderr, "%s\n", msg);
+}
+
+int yywrap (void)
+{
+  return 1;
+}
+
+int main (void)
+{
+  return yyparse ();
+}

diff --git a/gcc/rust/checks/errors/feature/contrib/regen b/gcc/rust/checks/errors/feature/contrib/regen
new file mode 100755 (executable)
index 0000000..0dc6cc5
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/regen
@@ -0,0 +1,23 @@
+#!/bin/sh
+
+# Copyright (C) 2025 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
+# <http://www.gnu.org/licenses/>.
+
+cd "$(dirname "$0")"
+rm -f ../rust-feature-defs.h
+make all

diff --git a/gcc/rust/checks/errors/feature/contrib/scan.l b/gcc/rust/checks/errors/feature/contrib/scan.l
new file mode 100644 (file)
index 0000000..768f4c7
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/contrib/scan.l
@@ -0,0 +1,55 @@
+/* Copyright (C) 2025 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
+<http://www.gnu.org/licenses/>.  */
+
+%{
+
+#include "parse.h"
+
+static int p_count = 0;
+
+%}
+
+%x INSIDE COMMENT
+
+%%
+
+declare_features!              BEGIN (INSIDE);
+.|\n                           /* ignore */
+
+<INSIDE>\(                     p_count++; return '(';
+<INSIDE>\)                     if (!--p_count) { BEGIN (0); } return ')';
+<INSIDE>,                      return ',';
+<INSIDE>::                     return SCOPE;
+<INSIDE>Some                   return K_SOME;
+<INSIDE>None                   return K_NONE;
+<INSIDE>active                 return K_ACTIVE;
+<INSIDE>accepted               return K_ACCEPTED;
+<INSIDE>removed                        return K_REMOVED;
+<INSIDE>stable_removed         return K_STABLE_REMOVED;
+<INSIDE>Edition                        return K_E_START;
+<INSIDE>Edition2018            return K_E_2018;
+
+<INSIDE>[A-Za-z_][A-Za-z0-9_]* yylval.str = strdup (yytext); return IDENT;
+<INSIDE>[1-9][0-9]*            yylval.str = strdup (yytext); return NUM;
+<INSIDE>\"[^"]+\"              yylval.str = strdup (yytext); return STR;
+<INSIDE>"/""/"                 BEGIN (COMMENT);
+<INSIDE>[ \n]                  /* ignore */
+<INSIDE>.                      { fprintf (stderr, "unrecognized character %u\n", (unsigned int) yytext[0]); exit (1); }
+
+<COMMENT>.                     /* skip */
+<COMMENT>\n                    BEGIN (INSIDE);

diff --git a/gcc/rust/checks/errors/feature/rust-feature-defs.h b/gcc/rust/checks/errors/feature/rust-feature-defs.h
new file mode 100644 (file)
index 0000000..d8514e1
--- /dev/null
+++ b/gcc/rust/checks/errors/feature/rust-feature-defs.h
@@ -0,0 +1,600 @@
+// Copyright (C) 2025 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
+// <http://www.gnu.org/licenses/>.
+
+// AUTO-GENERATED -- SEE LOCAL contrib SUBDIRECTORY
+
+FEATURE_ACCEPTED ("issue_5723_bootstrap", ISSUE_5723_BOOTSTRAP, "1.0.0",
+                 ISSUE_NONE)
+FEATURE_ACCEPTED ("test_accepted_feature", TEST_ACCEPTED_FEATURE, "1.0.0",
+                 ISSUE_NONE)
+FEATURE_ACCEPTED ("associated_types", ASSOCIATED_TYPES, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("default_type_params", DEFAULT_TYPE_PARAMS, "1.0.0",
+                 ISSUE_NONE)
+FEATURE_ACCEPTED ("globs", GLOBS, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("macro_rules", MACRO_RULES, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("slicing_syntax", SLICING_SYNTAX, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("struct_variant", STRUCT_VARIANT, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("tuple_indexing", TUPLE_INDEXING, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("if_let", IF_LET, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("while_let", WHILE_LET, "1.0.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("no_std", NO_STD, "1.6.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("augmented_assignments", AUGMENTED_ASSIGNMENTS, "1.8.0",
+                 ISSUE_SOME (28235))
+FEATURE_ACCEPTED ("braced_empty_structs", BRACED_EMPTY_STRUCTS, "1.8.0",
+                 ISSUE_SOME (29720))
+FEATURE_ACCEPTED ("deprecated", DEPRECATED, "1.9.0", ISSUE_SOME (29935))
+FEATURE_ACCEPTED ("type_macros", TYPE_MACROS, "1.13.0", ISSUE_SOME (27245))
+FEATURE_ACCEPTED ("question_mark", QUESTION_MARK, "1.13.0", ISSUE_SOME (31436))
+FEATURE_ACCEPTED ("dotdot_in_tuple_patterns", DOTDOT_IN_TUPLE_PATTERNS,
+                 "1.14.0", ISSUE_SOME (33627))
+FEATURE_ACCEPTED ("item_like_imports", ITEM_LIKE_IMPORTS, "1.15.0",
+                 ISSUE_SOME (35120))
+FEATURE_ACCEPTED ("more_struct_aliases", MORE_STRUCT_ALIASES, "1.16.0",
+                 ISSUE_SOME (37544))
+FEATURE_ACCEPTED ("static_in_const", STATIC_IN_CONST, "1.17.0",
+                 ISSUE_SOME (35897))
+FEATURE_ACCEPTED ("field_init_shorthand", FIELD_INIT_SHORTHAND, "1.17.0",
+                 ISSUE_SOME (37340))
+FEATURE_ACCEPTED ("static_recursion", STATIC_RECURSION, "1.17.0",
+                 ISSUE_SOME (29719))
+FEATURE_ACCEPTED ("pub_restricted", PUB_RESTRICTED, "1.18.0",
+                 ISSUE_SOME (32409))
+FEATURE_ACCEPTED ("windows_subsystem", WINDOWS_SUBSYSTEM, "1.18.0",
+                 ISSUE_SOME (37499))
+FEATURE_ACCEPTED ("loop_break_value", LOOP_BREAK_VALUE, "1.19.0",
+                 ISSUE_SOME (37339))
+FEATURE_ACCEPTED ("relaxed_adts", RELAXED_ADTS, "1.19.0", ISSUE_SOME (35626))
+FEATURE_ACCEPTED ("closure_to_fn_coercion", CLOSURE_TO_FN_COERCION, "1.19.0",
+                 ISSUE_SOME (39817))
+FEATURE_ACCEPTED ("struct_field_attributes", STRUCT_FIELD_ATTRIBUTES, "1.20.0",
+                 ISSUE_SOME (38814))
+FEATURE_ACCEPTED ("associated_consts", ASSOCIATED_CONSTS, "1.20.0",
+                 ISSUE_SOME (29646))
+FEATURE_ACCEPTED ("compile_error", COMPILE_ERROR, "1.20.0", ISSUE_SOME (40872))
+FEATURE_ACCEPTED ("rvalue_static_promotion", RVALUE_STATIC_PROMOTION, "1.21.0",
+                 ISSUE_SOME (38865))
+FEATURE_ACCEPTED ("drop_types_in_const", DROP_TYPES_IN_CONST, "1.22.0",
+                 ISSUE_SOME (33156))
+FEATURE_ACCEPTED ("abi_sysv64", ABI_SYSV64, "1.24.0", ISSUE_SOME (36167))
+FEATURE_ACCEPTED ("repr_align", REPR_ALIGN, "1.25.0", ISSUE_SOME (33626))
+FEATURE_ACCEPTED ("match_beginning_vert", MATCH_BEGINNING_VERT, "1.25.0",
+                 ISSUE_SOME (44101))
+FEATURE_ACCEPTED ("use_nested_groups", USE_NESTED_GROUPS, "1.25.0",
+                 ISSUE_SOME (44494))
+FEATURE_ACCEPTED ("const_indexing", CONST_INDEXING, "1.26.0",
+                 ISSUE_SOME (29947))
+FEATURE_ACCEPTED ("inclusive_range_syntax", INCLUSIVE_RANGE_SYNTAX, "1.26.0",
+                 ISSUE_SOME (28237))
+FEATURE_ACCEPTED ("dotdoteq_in_patterns", DOTDOTEQ_IN_PATTERNS, "1.26.0",
+                 ISSUE_SOME (28237))
+FEATURE_ACCEPTED ("termination_trait", TERMINATION_TRAIT, "1.26.0",
+                 ISSUE_SOME (43301))
+FEATURE_ACCEPTED ("clone_closures", CLONE_CLOSURES, "1.26.0",
+                 ISSUE_SOME (44490))
+FEATURE_ACCEPTED ("copy_closures", COPY_CLOSURES, "1.26.0", ISSUE_SOME (44490))
+FEATURE_ACCEPTED ("universal_impl_trait", UNIVERSAL_IMPL_TRAIT, "1.26.0",
+                 ISSUE_SOME (34511))
+FEATURE_ACCEPTED ("conservative_impl_trait", CONSERVATIVE_IMPL_TRAIT, "1.26.0",
+                 ISSUE_SOME (34511))
+FEATURE_ACCEPTED ("i128_type", I128_TYPE, "1.26.0", ISSUE_SOME (35118))
+FEATURE_ACCEPTED ("match_default_bindings", MATCH_DEFAULT_BINDINGS, "1.26.0",
+                 ISSUE_SOME (42640))
+FEATURE_ACCEPTED ("underscore_lifetimes", UNDERSCORE_LIFETIMES, "1.26.0",
+                 ISSUE_SOME (44524))
+FEATURE_ACCEPTED ("generic_param_attrs", GENERIC_PARAM_ATTRS, "1.27.0",
+                 ISSUE_SOME (48848))
+FEATURE_ACCEPTED ("cfg_target_feature", CFG_TARGET_FEATURE, "1.27.0",
+                 ISSUE_SOME (29717))
+FEATURE_ACCEPTED ("target_feature", TARGET_FEATURE, "1.27.0", ISSUE_NONE)
+FEATURE_ACCEPTED ("dyn_trait", DYN_TRAIT, "1.27.0", ISSUE_SOME (44662))
+FEATURE_ACCEPTED ("fn_must_use", FN_MUST_USE, "1.27.0", ISSUE_SOME (43302))
+FEATURE_ACCEPTED ("macro_lifetime_matcher", MACRO_LIFETIME_MATCHER, "1.27.0",
+                 ISSUE_SOME (34303))
+FEATURE_ACCEPTED ("termination_trait_test", TERMINATION_TRAIT_TEST, "1.27.0",
+                 ISSUE_SOME (48854))
+FEATURE_ACCEPTED ("global_allocator", GLOBAL_ALLOCATOR, "1.28.0",
+                 ISSUE_SOME (27389))
+FEATURE_ACCEPTED ("repr_transparent", REPR_TRANSPARENT, "1.28.0",
+                 ISSUE_SOME (43036))
+FEATURE_ACCEPTED ("proc_macro", PROC_MACRO, "1.29.0", ISSUE_SOME (38356))
+FEATURE_ACCEPTED ("non_modrs_mods", NON_MODRS_MODS, "1.30.0",
+                 ISSUE_SOME (44660))
+FEATURE_ACCEPTED ("macro_vis_matcher", MACRO_VIS_MATCHER, "1.30.0",
+                 ISSUE_SOME (41022))
+FEATURE_ACCEPTED ("use_extern_macros", USE_EXTERN_MACROS, "1.30.0",
+                 ISSUE_SOME (35896))
+FEATURE_ACCEPTED ("raw_identifiers", RAW_IDENTIFIERS, "1.30.0",
+                 ISSUE_SOME (48589))
+FEATURE_ACCEPTED ("tool_attributes", TOOL_ATTRIBUTES, "1.30.0",
+                 ISSUE_SOME (44690))
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+                 ISSUE_SOME (38356))
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+FEATURE_ACCEPTED ("infer_outlives_requirements", INFER_OUTLIVES_REQUIREMENTS,
+                 "1.30.0", ISSUE_SOME (44493))
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+FEATURE_ACCEPTED ("crate_in_paths", CRATE_IN_PATHS, "1.30.0",
+                 ISSUE_SOME (45477))
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+                 ISSUE_SOME (44660))
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+                 "1.33.0", ISSUE_SOME (44495))
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+                 ISSUE_SOME (44109))
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+               EDITION_NONE)
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+               ISSUE_NONE, EDITION_NONE)
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+               ISSUE_NONE, EDITION_NONE)
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+               ISSUE_SOME (29602), EDITION_NONE)
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+               EDITION_NONE)
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+               ISSUE_SOME (29625), EDITION_NONE)
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+               ISSUE_SOME (13231), EDITION_NONE)
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+               EDITION_NONE)
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+               EDITION_NONE)
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+               ISSUE_SOME (31434), EDITION_NONE)
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+               ISSUE_SOME (32837), EDITION_NONE)
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+               EDITION_NONE)
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+               "1.49.0", ISSUE_SOME (69399), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (44839), EDITION_NONE)
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+               ISSUE_SOME (38487), EDITION_NONE)
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+               ISSUE_SOME (42877), EDITION_NONE)
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+               EDITION_NONE)
+FEATURE_ACTIVE ("const_extern_fn", CONST_EXTERN_FN, "1.40.0",
+               ISSUE_SOME (64926), EDITION_NONE)
+FEATURE_ACTIVE ("raw_dylib", RAW_DYLIB, "1.40.0", ISSUE_SOME (58713),
+               EDITION_NONE)
+FEATURE_ACTIVE ("object_safe_for_dispatch", OBJECT_SAFE_FOR_DISPATCH, "1.40.0",
+               ISSUE_SOME (43561), EDITION_NONE)
+FEATURE_ACTIVE ("abi_efiapi", ABI_EFIAPI, "1.40.0", ISSUE_SOME (65815),
+               EDITION_NONE)
+FEATURE_ACTIVE ("raw_ref_op", RAW_REF_OP, "1.41.0", ISSUE_SOME (64490),
+               EDITION_NONE)
+FEATURE_ACTIVE ("never_type_fallback", NEVER_TYPE_FALLBACK, "1.41.0",
+               ISSUE_SOME (65992), EDITION_NONE)
+FEATURE_ACTIVE ("register_attr", REGISTER_ATTR, "1.41.0", ISSUE_SOME (66080),
+               EDITION_NONE)
+FEATURE_ACTIVE ("register_tool", REGISTER_TOOL, "1.41.0", ISSUE_SOME (66079),
+               EDITION_NONE)
+FEATURE_ACTIVE ("cfg_sanitize", CFG_SANITIZE, "1.41.0", ISSUE_SOME (39699),
+               EDITION_NONE)
+FEATURE_ACTIVE ("half_open_range_patterns", HALF_OPEN_RANGE_PATTERNS, "1.41.0",
+               ISSUE_SOME (67264), EDITION_NONE)
+FEATURE_ACTIVE ("const_mut_refs", CONST_MUT_REFS, "1.41.0", ISSUE_SOME (57349),
+               EDITION_NONE)
+FEATURE_ACTIVE ("bindings_after_at", BINDINGS_AFTER_AT, "1.41.0",
+               ISSUE_SOME (65490), EDITION_NONE)
+FEATURE_ACTIVE ("const_trait_impl", CONST_TRAIT_IMPL, "1.42.0",
+               ISSUE_SOME (67792), EDITION_NONE)
+FEATURE_ACTIVE ("const_trait_bound_opt_out", CONST_TRAIT_BOUND_OPT_OUT,
+               "1.42.0", ISSUE_SOME (67794), EDITION_NONE)
+FEATURE_ACTIVE ("no_sanitize", NO_SANITIZE, "1.42.0", ISSUE_SOME (39699),
+               EDITION_NONE)
+FEATURE_ACTIVE ("const_eval_limit", CONST_EVAL_LIMIT, "1.43.0",
+               ISSUE_SOME (67217), EDITION_NONE)
+FEATURE_ACTIVE ("negative_impls", NEGATIVE_IMPLS, "1.44.0", ISSUE_SOME (68318),
+               EDITION_NONE)
+FEATURE_ACTIVE ("target_feature_11", TARGET_FEATURE_11, "1.45.0",
+               ISSUE_SOME (69098), EDITION_NONE)
+FEATURE_ACTIVE ("cfg_version", CFG_VERSION, "1.45.0", ISSUE_SOME (64796),
+               EDITION_NONE)
+FEATURE_ACTIVE ("ffi_pure", FFI_PURE, "1.45.0", ISSUE_SOME (58329),
+               EDITION_NONE)
+FEATURE_ACTIVE ("ffi_const", FFI_CONST, "1.45.0", ISSUE_SOME (58328),
+               EDITION_NONE)
+FEATURE_ACTIVE ("unsafe_block_in_unsafe_fn", UNSAFE_BLOCK_IN_UNSAFE_FN,
+               "1.45.0", ISSUE_SOME (71668), EDITION_NONE)
+FEATURE_ACTIVE ("abi_avr_interrupt", ABI_AVR_INTERRUPT, "1.45.0",
+               ISSUE_SOME (69664), EDITION_NONE)
+FEATURE_ACTIVE ("const_precise_live_drops", CONST_PRECISE_LIVE_DROPS, "1.46.0",
+               ISSUE_SOME (73255), EDITION_NONE)
+FEATURE_ACTIVE ("format_args_capture", FORMAT_ARGS_CAPTURE, "1.46.0",
+               ISSUE_SOME (67984), EDITION_NONE)
+FEATURE_ACTIVE ("lazy_normalization_consts", LAZY_NORMALIZATION_CONSTS,
+               "1.46.0", ISSUE_SOME (72219), EDITION_NONE)
+FEATURE_ACTIVE ("const_fn_transmute", CONST_FN_TRANSMUTE, "1.46.0",
+               ISSUE_SOME (53605), EDITION_NONE)
+FEATURE_ACTIVE ("min_const_generics", MIN_CONST_GENERICS, "1.47.0",
+               ISSUE_SOME (74878), EDITION_NONE)
+FEATURE_ACTIVE ("if_let_guard", IF_LET_GUARD, "1.47.0", ISSUE_SOME (51114),
+               EDITION_NONE)
+FEATURE_ACTIVE ("const_evaluatable_checked", CONST_EVALUATABLE_CHECKED,
+               "1.48.0", ISSUE_SOME (76560), EDITION_NONE)
+FEATURE_ACTIVE ("const_fn_floating_point_arithmetic",
+               CONST_FN_FLOATING_POINT_ARITHMETIC, "1.48.0",
+               ISSUE_SOME (57241), EDITION_NONE)
+FEATURE_ACTIVE ("const_fn_fn_ptr_basics", CONST_FN_FN_PTR_BASICS, "1.48.0",
+               ISSUE_SOME (57563), EDITION_NONE)
+FEATURE_ACTIVE ("cmse_nonsecure_entry", CMSE_NONSECURE_ENTRY, "1.48.0",
+               ISSUE_SOME (75835), EDITION_NONE)
+FEATURE_ACTIVE ("default_alloc_error_handler", DEFAULT_ALLOC_ERROR_HANDLER,
+               "1.48.0", ISSUE_SOME (66741), EDITION_NONE)
+FEATURE_ACTIVE ("const_impl_trait", CONST_IMPL_TRAIT, "1.48.0",
+               ISSUE_SOME (77463), EDITION_NONE)
+FEATURE_ACTIVE ("isa_attribute", ISA_ATTRIBUTE, "1.48.0", ISSUE_SOME (74727),
+               EDITION_NONE)
+FEATURE_ACTIVE ("inline_const", INLINE_CONST, "1.49.0", ISSUE_SOME (76001),
+               EDITION_NONE)
+FEATURE_ACTIVE ("unsized_fn_params", UNSIZED_FN_PARAMS, "1.49.0",
+               ISSUE_SOME (48055), EDITION_NONE)
+FEATURE_ACTIVE ("destructuring_assignment", DESTRUCTURING_ASSIGNMENT, "1.49.0",
+               ISSUE_SOME (71126), EDITION_NONE)
+FEATURE_ACTIVE ("cfg_panic", CFG_PANIC, "1.49.0", ISSUE_SOME (77443),
+               EDITION_NONE)
+FEATURE_REMOVED ("import_shadowing", IMPORT_SHADOWING, "1.0.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED ("managed_boxes", MANAGED_BOXES, "1.0.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED ("negate_unsigned", NEGATE_UNSIGNED, "1.0.0",
+                ISSUE_SOME (29645), REASON_NONE)
+FEATURE_REMOVED ("reflect", REFLECT, "1.0.0", ISSUE_SOME (27749), REASON_NONE)
+FEATURE_REMOVED ("opt_out_copy", OPT_OUT_COPY, "1.0.0", ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("quad_precision_float", QUAD_PRECISION_FLOAT, "1.0.0",
+                ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("struct_inherit", STRUCT_INHERIT, "1.0.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED ("test_removed_feature", TEST_REMOVED_FEATURE, "1.0.0",
+                ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("visible_private_types", VISIBLE_PRIVATE_TYPES, "1.0.0",
+                ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("unsafe_no_drop_flag", UNSAFE_NO_DROP_FLAG, "1.0.0",
+                ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("unmarked_api", UNMARKED_API, "1.0.0", ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("allocator", ALLOCATOR, "1.0.0", ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("simd", SIMD, "1.0.0", ISSUE_SOME (27731),
+                REASON_SOME ("removed in favor of `#[repr(simd)]`"))
+FEATURE_REMOVED ("advanced_slice_patterns", ADVANCED_SLICE_PATTERNS, "1.0.0",
+                ISSUE_SOME (62254),
+                REASON_SOME ("merged into `#![feature(slice_patterns)]`"))
+FEATURE_REMOVED ("macro_reexport", MACRO_REEXPORT, "1.0.0", ISSUE_SOME (29638),
+                REASON_SOME ("subsumed by `pub use`"))
+FEATURE_REMOVED (
+  "custom_attribute", CUSTOM_ATTRIBUTE, "1.0.0", ISSUE_SOME (29642),
+  REASON_SOME (
+    "removed in favor of `#![register_tool]` and `#![register_attr]`"))
+FEATURE_REMOVED ("pushpop_unsafe", PUSHPOP_UNSAFE, "1.2.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED ("needs_allocator", NEEDS_ALLOCATOR, "1.4.0",
+                ISSUE_SOME (27389),
+                REASON_SOME ("subsumed by `#![feature(allocator_internals)]`"))
+FEATURE_REMOVED ("sanitizer_runtime", SANITIZER_RUNTIME, "1.17.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED ("proc_macro_mod", PROC_MACRO_MOD, "1.27.0", ISSUE_SOME (54727),
+                REASON_SOME ("subsumed by `#![feature(proc_macro_hygiene)]`"))
+FEATURE_REMOVED ("proc_macro_expr", PROC_MACRO_EXPR, "1.27.0",
+                ISSUE_SOME (54727),
+                REASON_SOME ("subsumed by `#![feature(proc_macro_hygiene)]`"))
+FEATURE_REMOVED ("proc_macro_non_items", PROC_MACRO_NON_ITEMS, "1.27.0",
+                ISSUE_SOME (54727),
+                REASON_SOME ("subsumed by `#![feature(proc_macro_hygiene)]`"))
+FEATURE_REMOVED ("proc_macro_gen", PROC_MACRO_GEN, "1.27.0", ISSUE_SOME (54727),
+                REASON_SOME ("subsumed by `#![feature(proc_macro_hygiene)]`"))
+FEATURE_REMOVED ("panic_implementation", PANIC_IMPLEMENTATION, "1.28.0",
+                ISSUE_SOME (44489),
+                REASON_SOME ("subsumed by `#[panic_handler]`"))
+FEATURE_REMOVED ("custom_derive", CUSTOM_DERIVE, "1.32.0", ISSUE_SOME (29644),
+                REASON_SOME ("subsumed by `#[proc_macro_derive]`"))
+FEATURE_REMOVED ("extern_in_paths", EXTERN_IN_PATHS, "1.33.0",
+                ISSUE_SOME (55600),
+                REASON_SOME ("subsumed by `::foo::bar` paths"))
+FEATURE_REMOVED ("quote", QUOTE, "1.33.0", ISSUE_SOME (29601), REASON_NONE)
+FEATURE_REMOVED ("dropck_parametricity", DROPCK_PARAMETRICITY, "1.38.0",
+                ISSUE_SOME (28498), REASON_NONE)
+FEATURE_REMOVED ("await_macro", AWAIT_MACRO, "1.38.0", ISSUE_SOME (50547),
+                REASON_SOME ("subsumed by `.await` syntax"))
+FEATURE_REMOVED (
+  "existential_type", EXISTENTIAL_TYPE, "1.38.0", ISSUE_SOME (63063),
+  REASON_SOME ("removed in favor of `#![feature(type_alias_impl_trait)]`"))
+FEATURE_REMOVED ("rustc_diagnostic_macros", RUSTC_DIAGNOSTIC_MACROS, "1.38.0",
+                ISSUE_NONE, REASON_NONE)
+FEATURE_REMOVED ("on_unimplemented", ON_UNIMPLEMENTED, "1.40.0", ISSUE_NONE,
+                REASON_NONE)
+FEATURE_REMOVED (
+  "overlapping_marker_traits", OVERLAPPING_MARKER_TRAITS, "1.42.0",
+  ISSUE_SOME (29864),
+  REASON_SOME ("removed in favor of `#![feature(marker_trait_attr)]`"))
+FEATURE_REMOVED ("no_debug", F_NO_DEBUG, "1.43.0", ISSUE_SOME (29721),
+                REASON_SOME ("removed due to lack of demand"))
+FEATURE_REMOVED (
+  "const_compare_raw_pointers", CONST_COMPARE_RAW_POINTERS, "1.46.0",
+  ISSUE_SOME (53020),
+  REASON_SOME ("cannot be allowed in const eval in any meaningful way"))
+FEATURE_STABLE_REMOVED ("no_stack_check", NO_STACK_CHECK, "1.0.0", ISSUE_NONE)

diff --git a/gcc/rust/checks/errors/feature/rust-feature-gate.cc b/gcc/rust/checks/errors/feature/rust-feature-gate.cc
index 44007f99e5cfb418beb0a023e2a4d20e230b6ffa..b2a6b6c6481214cd49bcd84612b745c8d0c20796 100644 (file)
--- a/gcc/rust/checks/errors/feature/rust-feature-gate.cc
+++ b/gcc/rust/checks/errors/feature/rust-feature-gate.cc
@@ -82,7 +82,7 @@ FeatureGate::gate (Feature::Name name, location_t loc,
 {
   if (!valid_features.count (name))
     {
-      auto feature = Feature::create (name);
+      auto &feature = Feature::lookup (name);
       if (auto issue = feature.issue ())
        {
          auto issue_number = issue.value ();
@@ -184,7 +184,7 @@ void
 FeatureGate::visit (AST::Trait &trait)
 {
   if (trait.is_auto ())
-    gate (Feature::Name::AUTO_TRAITS, trait.get_locus (),
+    gate (Feature::Name::OPTIN_BUILTIN_TRAITS, trait.get_locus (),
          "auto traits are experimental and possibly buggy");
   AST::DefaultASTVisitor::visit (trait);
 }

diff --git a/gcc/rust/checks/errors/feature/rust-feature.cc b/gcc/rust/checks/errors/feature/rust-feature.cc
index 071d3f8c0d9736dcf5004b3f18c894e7381ed86e..7fc5cb047975aca9815ec8b901f99e2976ca5495 100644 (file)
--- a/gcc/rust/checks/errors/feature/rust-feature.cc
+++ b/gcc/rust/checks/errors/feature/rust-feature.cc
@@ -20,70 +20,58 @@
 
 namespace Rust {
 
-Feature
-Feature::create (Feature::Name f)
-{
-  switch (f)
-    {
-    case Feature::Name::ASSOCIATED_TYPE_BOUNDS:
-      return Feature (Feature::Name::ASSOCIATED_TYPE_BOUNDS,
-                     Feature::State::ACCEPTED, "associated_type_bounds",
-                     "1.34.0", 52662);
-    case Feature::Name::INTRINSICS:
-      return Feature (f, Feature::State::ACCEPTED, "intrinsics", "1.0.0");
-    case Feature::Name::RUSTC_ATTRS:
-      return Feature (f, Feature::State::ACCEPTED, "rustc_attrs", "1.0.0");
-    case Feature::Name::DECL_MACRO:
-      return Feature (f, Feature::State::ACCEPTED, "decl_macro", "1.0.0",
-                     39412);
-    case Feature::Name::EXTERN_TYPES:
-      return Feature (f, Feature::State::ACTIVE, "extern_types", "1.23.0",
-                     43467);
-    case Feature::Name::NEGATIVE_IMPLS:
-      return Feature (f, Feature::State::ACTIVE, "negative_impls", "1.0.0",
-                     68318);
-    case Feature::Name::BOX_SYNTAX:
-      return Feature (f, Feature::State::ACTIVE, "box_syntax", "1.0.0", 49733);
-    case Feature::Name::DROPCK_EYEPATCH:
-      return Feature (f, Feature::State::ACTIVE, "dropck_eyepatch", "1.10.0",
-                     34761);
-    case Feature::Name::RAW_REF_OP:
-      return Feature (f, Feature::State::ACTIVE, "raw_ref_op", "1.41.0", 64490);
-    case Feature::Name::EXCLUSIVE_RANGE_PATTERN:
-      return Feature (Feature::Name::EXCLUSIVE_RANGE_PATTERN,
-                     Feature::State::ACTIVE, "exclusive_range_pattern",
-                     "1.11.0", 37854);
-    case Feature::Name::PRELUDE_IMPORT:
-      return Feature (f, Feature::State::ACTIVE, "prelude_import", "1.0.0");
-    case Feature::Name::MIN_SPECIALIZATION:
-      return Feature (f, Feature::State::ACTIVE, "min_specialization",
-                     "1.0.0" /* FIXME: What version here? */, 31844);
-    case Feature::Name::AUTO_TRAITS:
-      return Feature (f, Feature::State::ACTIVE, "optin_builtin_traits",
-                     "1.0.0", 13231);
-    default:
-      rust_unreachable ();
-    }
-}
+Feature Feature::feature_list[] = {
+#define ISSUE_SOME(n) n
+#define ISSUE_NONE tl::nullopt
+#define EDITION_2018 Edition::E2018
+#define EDITION_NONE tl::nullopt
+#define REASON_SOME(r) r
+#define REASON_NONE tl::nullopt
+
+#define FEATURE_BASE(state, name_str, name, rust_since, issue, ...)            \
+  Feature (Feature::Name::name, Feature::State::state, name_str, rust_since,   \
+          issue, __VA_ARGS__),
+
+#define FEATURE_ACTIVE(a, b, c, d, edition)                                    \
+  FEATURE_BASE (ACTIVE, a, b, c, d, edition, tl::nullopt)
+
+#define FEATURE_ACCEPTED(a, b, c, d)                                           \
+  FEATURE_BASE (ACCEPTED, a, b, c, d, tl::nullopt, tl::nullopt)
+
+#define FEATURE_REMOVED(a, b, c, d, reason)                                    \
+  FEATURE_BASE (REMOVED, a, b, c, d, tl::nullopt, reason)
+
+#define FEATURE_STABLE_REMOVED(a, b, c, d)                                     \
+  FEATURE_BASE (ACCEPTED, a, b, c, d, tl::nullopt, tl::nullopt)
+
+#include "rust-feature-defs.h"
+
+#undef ISSUE_SOME
+#undef ISSUE_NONE
+#undef EDITION_2018
+#undef EDITION_NONE
+#undef REASON_SOME
+#undef REASON_NONE
+
+#undef FEATURE_BASE
+#undef FEATURE_ACTIVE
+#undef FEATURE_ACCEPTED
+#undef FEATURE_REMOVED
+#undef FEATURE_STABLE_REMOVED
+};
 
 const std::map<std::string, Feature::Name> Feature::name_hash_map = {
-  {"associated_type_bounds", Feature::Name::ASSOCIATED_TYPE_BOUNDS},
-  {"intrinsics", Feature::Name::INTRINSICS},
-  {"rustc_attrs", Feature::Name::RUSTC_ATTRS},
-  {"decl_macro", Feature::Name::DECL_MACRO},
-  {"negative_impls", Feature::Name::NEGATIVE_IMPLS},
-  // TODO: Rename to "auto_traits" when supporting
-  // later Rust versions
-  {"optin_builtin_traits", Feature::Name::AUTO_TRAITS},
-  {"extern_types", Feature::Name::EXTERN_TYPES},
-  {"lang_items", Feature::Name::LANG_ITEMS},
-  {"no_core", Feature::Name::NO_CORE},
-  {"box_syntax", Feature::Name::BOX_SYNTAX},
-  {"dropck_eyepatch", Feature::Name::DROPCK_EYEPATCH},
-  {"raw_ref_op", Feature::Name::RAW_REF_OP},
-  {"exclusive_range_pattern", Feature::Name::EXCLUSIVE_RANGE_PATTERN},
-  {"prelude_import", Feature::Name::PRELUDE_IMPORT},
-  {"min_specialization", Feature::Name::MIN_SPECIALIZATION},
+#define FEATURE(s, name, ...) {s, Feature::Name::name},
+#define FEATURE_ACTIVE(...) FEATURE (__VA_ARGS__)
+#define FEATURE_ACCEPTED(...) FEATURE (__VA_ARGS__)
+#define FEATURE_REMOVED(...) FEATURE (__VA_ARGS__)
+#define FEATURE_STABLE_REMOVED(...) FEATURE (__VA_ARGS__)
+#include "rust-feature-defs.h"
+#undef FEATURE
+#undef FEATURE_ACTIVE
+#undef FEATURE_ACCEPTED
+#undef FEATURE_REMOVED
+#undef FEATURE_STABLE_REMOVED
 };
 
 tl::optional<Feature::Name>
@@ -95,4 +83,17 @@ Feature::as_name (const std::string &name)
   return tl::nullopt;
 }
 
+tl::optional<std::reference_wrapper<const Feature>>
+Feature::lookup (const std::string &name)
+{
+  return as_name (name).map (
+    [] (Name n) { return std::ref (Feature::lookup (n)); });
+}
+
+const Feature &
+Feature::lookup (Feature::Name name)
+{
+  return feature_list[static_cast<size_t> (name)];
+}
+
 } // namespace Rust

diff --git a/gcc/rust/checks/errors/feature/rust-feature.h b/gcc/rust/checks/errors/feature/rust-feature.h
index e7cb0afc6895bfaf3702cc3a10ea61f1304894f9..8686cf4b3b762b9e6c2006c8dd85d619b638b6e7 100644 (file)
--- a/gcc/rust/checks/errors/feature/rust-feature.h
+++ b/gcc/rust/checks/errors/feature/rust-feature.h
@@ -29,59 +29,55 @@ class Feature
 public:
   enum class State
   {
-    ACCEPTED,
-    ACTIVE,
-    REMOVED,
-    STABILIZED,
+    ACCEPTED,  // stabilized
+    ACTIVE,    // unstable
+    REMOVED,   // removed
+    STABILIZED, // removed after stabilization
   };
 
   enum class Name
   {
-    ASSOCIATED_TYPE_BOUNDS,
-    INTRINSICS,
-    NEGATIVE_IMPLS,
-    RUSTC_ATTRS,
-    DECL_MACRO,
-    AUTO_TRAITS,
-    EXTERN_TYPES,
-    LANG_ITEMS,
-    NO_CORE,
-    BOX_SYNTAX,
-    DROPCK_EYEPATCH,
-    RAW_REF_OP,
-    EXCLUSIVE_RANGE_PATTERN,
-    PRELUDE_IMPORT,
-    MIN_SPECIALIZATION,
+#define FEATURE_ACTIVE(x, name, ...) name,
+#define FEATURE_ACCEPTED(x, name, ...) name,
+#define FEATURE_REMOVED(x, name, ...) name,
+#define FEATURE_STABLE_REMOVED(x, name, ...) name,
+#include "rust-feature-defs.h"
+#undef FEATURE_ACTIVE
+#undef FEATURE_ACCEPTED
+#undef FEATURE_REMOVED
+#undef FEATURE_STABLE_REMOVED
   };
 
-  const std::string &as_string () { return m_name_str; }
-  Name name () { return m_name; }
-  const std::string &description () { return m_description; }
-  State state () { return m_state; }
-  tl::optional<unsigned> issue () { return m_issue; }
+  const std::string &as_string () const { return m_name_str; }
+
+  Name name () const { return m_name; }
+  State state () const { return m_state; }
+  tl::optional<unsigned> issue () const { return m_issue; }
 
   static tl::optional<Name> as_name (const std::string &name);
-  static Feature create (Name name);
+
+  static tl::optional<std::reference_wrapper<const Feature>>
+  lookup (const std::string &name);
+  static const Feature &lookup (Name name);
 
 private:
-  Feature (Name name, State state, const char *name_str,
-          const char *rustc_since,
-          tl::optional<unsigned> issue_number = tl::nullopt,
-          const tl::optional<Edition> &edition = tl::nullopt,
-          const char *description = "")
-    : m_state (state), m_name (name), m_name_str (name_str),
-      m_rustc_since (rustc_since), m_issue (issue_number), edition (edition),
-      m_description (description)
+  Feature (Name name, State state, const char *name_str, const char *rust_since,
+          tl::optional<unsigned> issue_number, tl::optional<Edition> edition,
+          tl::optional<const char *> reason)
+    : m_name (name), m_state (state), m_name_str (name_str),
+      m_rust_since (rust_since), m_issue (issue_number), edition (edition),
+      m_reason (reason)
   {}
 
-  State m_state;
   Name m_name;
+  State m_state;
   std::string m_name_str;
-  std::string m_rustc_since;
+  std::string m_rust_since;
   tl::optional<unsigned> m_issue;
   tl::optional<Edition> edition;
-  std::string m_description; // TODO: Switch to optional?
+  tl::optional<const char *> m_reason;
 
+  static Feature feature_list[];
   static const std::map<std::string, Name> name_hash_map;
 };