From: Andrew Burgess Date: Tue, 17 Jun 2025 17:09:49 +0000 (+0100) Subject: gdb/python: extend gdb.write to support styled output X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3c724596812882cc0c3b653330551fae132d6475;p=thirdparty%2Fbinutils-gdb.git gdb/python: extend gdb.write to support styled output It is already possible to produce styled output from Python by converting the gdb.Style to its escape code sequence, and writing that to the output stream. But this commit adds an alternative option to the mix by extending the existing gdb.write() function to accept a 'style' argument. The value of this argument can be 'None' to indicate no style change should be performed, this is the default, and matches the existing behaviour. Or the new 'style' argument can be a gdb.Style object, in which case the specified style is applied only for the string passed to gdb.write, after which the default style is re-applied. Using gdb.write with a style object more closely matches how GDB handles styling internally, and has the benefit that the user doesn't need to remember to restore the default style when they are done. Reviewed-By: Eli Zaretskii Approved-By: Tom Tromey --- diff --git a/gdb/NEWS b/gdb/NEWS index b9c9afc1d77..2c73776944f 100644 --- a/gdb/NEWS +++ b/gdb/NEWS @@ -80,6 +80,9 @@ qExecAndArgs Use gdb.StyleParameterSet(NAME) to create 'set style NAME ...' and 'show style NAME ...' parameters. + ** The gdb.write() function now takes an additional, optional, + 'style' argument, which can be used to style the output. + *** Changes in GDB 17 * Debugging Linux programs that use x86-64 or x86-64 with 32-bit pointer diff --git a/gdb/doc/python.texi b/gdb/doc/python.texi index e3f95ee1d24..2f74a2311a6 100644 --- a/gdb/doc/python.texi +++ b/gdb/doc/python.texi @@ -452,7 +452,7 @@ will be @code{None} and 0 respectively. This is identical to historical compatibility. @end defun -@defun gdb.write (string @r{[}, stream@r{]}) +@defun gdb.write (string @r{[}, stream@r{]} @r{[}, style@r{]}) Print a string to @value{GDBN}'s paginated output stream. The optional @var{stream} determines the stream to print to. The default stream is @value{GDBN}'s standard output stream. Possible stream @@ -475,6 +475,13 @@ values are: @value{GDBN}'s log stream (@pxref{Logging Output}). @end table +The @var{style} should be a @code{gdb.Style} object (@pxref{Styles In +Python}), or @code{None} (the default). If @var{style} is @code{None} +then the current style for @var{stream} will be applied to @var{text}. +If @var{style} is a @code{gdb.Style} object, then this style is +applied to @var{text}, after which the default output style is +restored. + Writing to @code{sys.stdout} or @code{sys.stderr} will automatically call this function and will automatically direct the output to the relevant stream. diff --git a/gdb/python/py-style.c b/gdb/python/py-style.c index 51b35f2fa7e..cf65e3115b2 100644 --- a/gdb/python/py-style.c +++ b/gdb/python/py-style.c @@ -353,6 +353,15 @@ stylepy_init (PyObject *self, PyObject *args, PyObject *kwargs) +/* See python-internal.h. */ + +bool +gdbpy_is_style (PyObject *obj) +{ + gdb_assert (obj != nullptr); + return PyObject_TypeCheck (obj, &style_object_type); +} + /* Return the ui_file_style for STYLEPY. If the style cannot be found, then return an empty optional, and set a Python error. */ @@ -369,6 +378,18 @@ stylepy_to_style (style_object *stylepy) return style; } +/* See python-internal.h. */ + +std::optional +gdbpy_style_object_to_ui_file_style (PyObject *obj) +{ + gdb_assert (obj != nullptr); + gdb_assert (gdbpy_is_style (obj)); + + style_object *style_obj = (style_object *) obj; + return stylepy_to_style (style_obj); +} + /* Implementation of gdb.Style.escape_sequence(). Return the escape sequence to apply Style. If styling is turned off, then this returns the empty string. Can raise an exception if a named style can no longer diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h index f61a1753ac4..dbb2d7eb7e0 100644 --- a/gdb/python/python-internal.h +++ b/gdb/python/python-internal.h @@ -570,6 +570,20 @@ struct symtab_and_line *sal_object_to_symtab_and_line (PyObject *obj); frame_info_ptr frame_object_to_frame_info (PyObject *frame_obj); struct gdbarch *arch_object_to_gdbarch (PyObject *obj); +/* Return true if OBJ is a gdb.Style object. OBJ must not be NULL. */ + +extern bool gdbpy_is_style (PyObject *obj); + +/* Return the ui_file_style from OBJ, a gdb.Style object. OBJ must not be + NULL. + + It is possible that OBJ is a gdb.Style object, but the underlying style + cannot be fetched for some reason. If this happens then a Python error + is set and an empty optional is returned. */ + +extern std::optional + gdbpy_style_object_to_ui_file_style (PyObject *obj); + extern PyObject *gdbpy_execute_mi_command (PyObject *self, PyObject *args, PyObject *kw); diff --git a/gdb/python/python.c b/gdb/python/python.c index 740b1968742..51e7a0aa165 100644 --- a/gdb/python/python.c +++ b/gdb/python/python.c @@ -1567,12 +1567,22 @@ static PyObject * gdbpy_write (PyObject *self, PyObject *args, PyObject *kw) { const char *arg; - static const char *keywords[] = { "text", "stream", NULL }; + static const char *keywords[] = { "text", "stream", "style", nullptr }; int stream_type = 0; + PyObject *style_obj = Py_None; - if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|i", keywords, &arg, - &stream_type)) - return NULL; + if (!gdb_PyArg_ParseTupleAndKeywords (args, kw, "s|iO", keywords, &arg, + &stream_type, &style_obj)) + return nullptr; + + if (style_obj != Py_None && !gdbpy_is_style (style_obj)) + { + PyErr_Format + (PyExc_TypeError, + _("'style' argument must be gdb.Style or None, not %s."), + Py_TYPE (style_obj)->tp_name); + return nullptr; + } try { @@ -1590,7 +1600,17 @@ gdbpy_write (PyObject *self, PyObject *args, PyObject *kw) break; } - gdb_puts (arg, stream); + if (style_obj == Py_None) + gdb_puts (arg, stream); + else + { + std::optional style + = gdbpy_style_object_to_ui_file_style (style_obj); + if (!style.has_value ()) + return nullptr; + + fputs_styled (arg, style.value (), stream); + } } catch (const gdb_exception &except) { diff --git a/gdb/testsuite/gdb.python/py-color-pagination.exp b/gdb/testsuite/gdb.python/py-color-pagination.exp index 1974dbb4186..6b10f9ca793 100644 --- a/gdb/testsuite/gdb.python/py-color-pagination.exp +++ b/gdb/testsuite/gdb.python/py-color-pagination.exp @@ -131,8 +131,64 @@ proc test_pagination { type mode } { } } +# Run the command 'style-fill-v2' which fills the screen with output and +# triggers the pagination prompt. Check that styling is applied correctly +# to the output. This v2 command is exercising passing a style to +# gdb.write() rather than passing the escape sequence for the style. +proc test_pagination_v2 { } { + set saw_bad_color_handling false + set expected_restore_color "" + set last_color "" + gdb_test_multiple "style-fill-v2" "" { + -re "^style-fill-v2\r\n" { + exp_continue + } + + -re "^(${::any_color}\033\\\[m)(${::any_color})$::str\033\\\[m" { + # After a continuation prompt GDB will restore the previous + # color, and then we immediately switch to a new color. + set restored_color $expect_out(1,string) + if { $restored_color ne $expected_restore_color } { + set saw_bad_color_handling true + } + set last_color $expect_out(2,string) + exp_continue + } + + -re "^(${::any_color})$::str\033\\\[m" { + # This pattern matches printing STR in all cases that are not + # immediately after a pagination prompt. In this case there is + # a single escape sequence to set the color. + set last_color $expect_out(1,string) + exp_continue + } + + -re "^$::pagination_prompt$" { + # After a pagination prompt we expect GDB to restore the last + # color, but this will then be disabled due to a styled + # gdb.write emitting a return to default style escape sequence. + set expected_restore_color "$last_color\033\[m" + + # Send '\n' to view more output. + send_gdb "\n" + exp_continue + } + + -re "^\r\n" { + # The matches the newline sent to the continuation prompt. + exp_continue + } + + -re "^$::gdb_prompt $" { + gdb_assert { !$saw_bad_color_handling } $gdb_test_name + } + } +} + foreach_with_prefix type { color style } { foreach_with_prefix mode { write print } { test_pagination $type $mode } } + +test_pagination_v2 diff --git a/gdb/testsuite/gdb.python/py-color-pagination.py b/gdb/testsuite/gdb.python/py-color-pagination.py index f0252e5bf86..9cdc76cb0ce 100644 --- a/gdb/testsuite/gdb.python/py-color-pagination.py +++ b/gdb/testsuite/gdb.python/py-color-pagination.py @@ -62,5 +62,21 @@ class StyleTester(gdb.Command): write(mode, "\n") +class StyleTester2(gdb.Command): + def __init__(self): + super().__init__("style-fill-v2", gdb.COMMAND_USER) + + def invoke(self, args, from_tty): + str = "<" + "-" * 78 + ">" + for i in range(0, 20): + for color_name in basic_colors: + c = gdb.Color(color_name) + s = gdb.Style(foreground=c) + gdb.write(str, style=s) + + gdb.write("\n") + + ColorTester() StyleTester() +StyleTester2() diff --git a/gdb/testsuite/gdb.python/py-style.exp b/gdb/testsuite/gdb.python/py-style.exp index b2efe9a97e3..491e189774e 100644 --- a/gdb/testsuite/gdb.python/py-style.exp +++ b/gdb/testsuite/gdb.python/py-style.exp @@ -340,3 +340,32 @@ gdb_test_no_output "python input_text = \"a totally different string that is als gdb_test "python print(output_text)" \ "^this is a unique string that is unlikely to appear elsewhere 12345" \ "check the output_text is still valid" + +# Test gdb.write passing in a style. Define a helper function to +# ensure all output is flushed before we return to the prompt. +gdb_test_multiline "create function to call gdb.write then flush" \ + "python" "" \ + "def write_and_flush(*args, **kwargs):" "" \ + " gdb.write(*args, **kwargs)" "" \ + " gdb.write(\"\\n\")" "" \ + " gdb.flush(gdb.STDOUT)" "" \ + "end" "" + +gdb_test "python write_and_flush(\"some text\")" \ + "^some text" "unstyled text, no style passed" + +gdb_test "python write_and_flush(\"some text\", style=None)" \ + "^some text" "unstyled text, pass style as None" + +gdb_test "python write_and_flush(\"some text\", style=filename_style)" \ + "^\033\\\[34;41;2;23;24;27msome text\033\\\[m" \ + "styled output, pass style by keyword" + +gdb_test "python write_and_flush(\"some text\", gdb.STDOUT, filename_style)" \ + "^\033\\\[34;41;2;23;24;27msome text\033\\\[m" \ + "styled output, pass style by position" + +gdb_test "python write_and_flush(\"some text\", style='filename')" \ + [multi_line \ + "Python Exception : 'style' argument must be gdb\\.Style or None, not str\\." \ + "Error occurred in Python: 'style' argument must be gdb\\.Style or None, not str\\."]