Re: [PATCH] gdb: fix breakpoints on inline functions qualified with source file name

[Guinevere Larsen <guinevere@redhat.com>]

On 7/30/26 3:15 AM, Markus Metzger wrote:
> On 'break foo.[hc]:foo', GDB only searches the symbols of foo.[hc] on file
> scope.  If foo has been inlined, GDB would not find it.
>
> On 'break foo', however, GDB also searches local blocks for inline
> function symbols in iterate_over_all_matching_symtabs(), which is called
> indirectly from add_matching_symbols_to_info().
>
> Add that functionality to add_matching_symbols_to_info() in case it is
> called with a list of file symtabs to search.
> ---

Hi Markus!

I looked through and confirmed it fixes the test case you added, so all 
looks good!

I wonder, though, does it make sense to add this code to some common 
place, so that future code isn't going to forget to add this handling a 
well. Have you tried adding it to the iterate_over_file_blocks code?

-- 
Cheers,
Guinevere Larsen
it/its
she/her (deprecated)

>   gdb/linespec.c                           | 14 ++++++++++
>   gdb/testsuite/gdb.base/break-inline2.c   | 33 ++++++++++++++++++++++++
>   gdb/testsuite/gdb.base/break-inline2.exp | 30 +++++++++++++++++++++
>   gdb/testsuite/gdb.base/break-inline2.h   | 28 ++++++++++++++++++++
>   4 files changed, 105 insertions(+)
>   create mode 100644 gdb/testsuite/gdb.base/break-inline2.c
>   create mode 100644 gdb/testsuite/gdb.base/break-inline2.exp
>   create mode 100644 gdb/testsuite/gdb.base/break-inline2.h
>
> diff --git a/gdb/linespec.c b/gdb/linespec.c
> index b6505ba283d..384c989ef2f 100644
> --- a/gdb/linespec.c
> +++ b/gdb/linespec.c
> @@ -4276,6 +4276,20 @@ add_matching_symbols_to_info (const char *name,
>   	  set_current_program_space (elt_pspace);
>   	  iterate_over_file_blocks (elt, lookup_name, SEARCH_VFT, add_symbol);
>   
> +	  /* Search local blocks for inline functions, too.  */
> +	  const blockvector *bv = elt->compunit ().blockvector ();
> +	  for (int i = FIRST_LOCAL_BLOCK; i < bv->num_blocks (); i++)
> +	    {
> +	      const struct block *block = bv->block (i);
> +	      info->state->language->for_each_symbol
> +		(block, lookup_name, SEARCH_VFT,
> +		 [&] (block_symbol *bsym)
> +		   {
> +		     if (bsym->symbol->is_inlined ())
> +		       add_symbol (bsym);
> +		   });
> +	    }
> +
>   	  /* If no new symbols were found in this iteration and this symtab
>   	     is in assembler, we might actually be looking for a label for
>   	     which we don't have debug info.  Check for a minimal symbol in
> diff --git a/gdb/testsuite/gdb.base/break-inline2.c b/gdb/testsuite/gdb.base/break-inline2.c
> new file mode 100644
> index 00000000000..797ab07da31
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/break-inline2.c
> @@ -0,0 +1,33 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> +   Copyright 2026 Free Software Foundation, Inc.
> +
> +   This program 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 of the License, or
> +   (at your option) any later version.
> +
> +   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
> +
> +#include "break-inline2.h"
> +
> +static int
> +test (void)
> +{
> +  int f = foo ();
> +  int b = bar ();
> +  return f + b;
> +}
> +
> +int
> +main (void)
> +{
> + /* Don't make breakpoints on foo and main bind to the same address. */
> +  return test ();
> +}
> diff --git a/gdb/testsuite/gdb.base/break-inline2.exp b/gdb/testsuite/gdb.base/break-inline2.exp
> new file mode 100644
> index 00000000000..b10cdece118
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/break-inline2.exp
> @@ -0,0 +1,30 @@
> +#   Copyright (C) 2026 Free Software Foundation, Inc.
> +#
> +# This program 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 of the License, or
> +# (at your option) any later version.
> +#
> +# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
> +
> +standard_testfile
> +
> +if {[prepare_for_testing "failed to prepare" "$testfile" "$srcfile"]} {
> +    return
> +}
> +
> +if {![runto_main]} {
> +    return
> +}
> +
> +gdb_breakpoint "$testfile.h:foo" -message -allow-pending
> +gdb_breakpoint bar -message -allow-pending
> +
> +gdb_continue_to_breakpoint "foo" ".*foo.entry.*"
> +gdb_continue_to_breakpoint "bar" ".*bar.entry.*"
> diff --git a/gdb/testsuite/gdb.base/break-inline2.h b/gdb/testsuite/gdb.base/break-inline2.h
> new file mode 100644
> index 00000000000..e60d054e85b
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/break-inline2.h
> @@ -0,0 +1,28 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> +   Copyright 2026 Free Software Foundation, Inc.
> +
> +   This program 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 of the License, or
> +   (at your option) any later version.
> +
> +   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
> +
> +static inline int __attribute__((always_inline))
> +foo (void) /* foo.entry */
> +{ /* foo.entry */
> +  return 42; /* foo.entry */
> +}
> +
> +static inline int __attribute__((always_inline))
> +bar (void) /* bar.entry */
> +{ /* bar.entry */
> +  return 42; /* bar.entry */
> +}