[PATCH v3 1/1] gdb, infcmd: Support jump command with same line in multiple symtabs
Andrew Burgess
aburgess@redhat.com
Fri Apr 28 14:39:52 GMT 2023
Matti Puputti via Gdb-patches <gdb-patches@sourceware.org> writes:
> If a header file defining a static function is included in multiple source
> files, each calling the function, and GDB is asked to jump to a line inside
> that function, there would be multiple locations matching the target. The
> solution in this commit is to select the location in the current symtab.
> ---
> gdb/infcmd.c | 14 ++++-
> .../gdb.base/jump_multiple_objfiles.c | 30 ++++++++++
> .../gdb.base/jump_multiple_objfiles.exp | 57 +++++++++++++++++++
> .../gdb.base/jump_multiple_objfiles.h | 30 ++++++++++
> .../gdb.base/jump_multiple_objfiles_foo.c | 24 ++++++++
> 5 files changed, 154 insertions(+), 1 deletion(-)
> create mode 100755 gdb/testsuite/gdb.base/jump_multiple_objfiles.c
> create mode 100755 gdb/testsuite/gdb.base/jump_multiple_objfiles.exp
> create mode 100755 gdb/testsuite/gdb.base/jump_multiple_objfiles.h
> create mode 100755 gdb/testsuite/gdb.base/jump_multiple_objfiles_foo.c
>
> diff --git a/gdb/infcmd.c b/gdb/infcmd.c
> index 103899432f7..3e7fdb374a4 100644
> --- a/gdb/infcmd.c
> +++ b/gdb/infcmd.c
> @@ -1079,7 +1079,19 @@ jump_command (const char *arg, int from_tty)
> std::vector<symtab_and_line> sals
> = decode_line_with_last_displayed (arg, DECODE_LINE_FUNFIRSTLINE);
> if (sals.size () != 1)
> - error (_("Unreasonable jump request"));
> + {
> + /* If multiple sal-objects were found, try dropping those that aren't
> + from the current symtab. */
> + sals.erase (std::remove_if (sals.begin (), sals.end (),
> + [] (symtab_and_line &sal)
> + {
> + struct symtab_and_line cursal
> + = get_current_source_symtab_and_line ();
> + return sal.symtab != cursal.symtab;
Maybe worrying about nothing, but I wonder if we should move the call to
get_current_source_symtab_and_line outside of the lambda, and then
capture cursal by reference.
Also, the 'symtab_and_line &sal' can be made const.
> + }), sals.end ());
> + if (sals.size () != 1)
> + error (_("Unreasonable jump request"));
> + }
This all makes sense, but I think you need to update the docs. The docs
currently say:
... If @var{locspec} resolves to more than one address, the command
aborts before jumping.
Which isn't true any more right?
>
> symtab_and_line &sal = sals[0];
>
> diff --git a/gdb/testsuite/gdb.base/jump_multiple_objfiles.c b/gdb/testsuite/gdb.base/jump_multiple_objfiles.c
> new file mode 100755
> index 00000000000..b54eede9eb1
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/jump_multiple_objfiles.c
> @@ -0,0 +1,30 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> + Copyright 2021-2023 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 "jump_multiple_objfiles.h"
> +
> +extern int foo (int n);
> +
> +
> +int
> +main ()
> +{
> + int n = foo (1);
> + bar (n);
> +
> + return 0;
> +}
> diff --git a/gdb/testsuite/gdb.base/jump_multiple_objfiles.exp b/gdb/testsuite/gdb.base/jump_multiple_objfiles.exp
> new file mode 100755
> index 00000000000..56bbc21c92e
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/jump_multiple_objfiles.exp
> @@ -0,0 +1,57 @@
> +# Copyright 2021-2023 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/>. */
> +#
> +# Tests GDBs support for jump, when the source line is in multiple
> +# object files.
> +
> +
> +standard_testfile .c
> +set srcfile2 jump_multiple_objfiles_foo.c
> +set srcfile3 jump_multiple_objfiles.h
If you rename 'jump_multiple_objfiles_foo.c' to
'jump_multiple_objfiles-foo.c', then you can replace these three lines
with:
standard_testfile .c -foo.c .h
which is the preferred approach these days.
> +
> +
> +if { [prepare_for_testing "failed to prepare" $testfile \
> + [list ${srcfile} ${srcfile2}]] } {
> + return -1
> +}
> +
> +if { ![runto_main] } {
> + perror "couldn't run to breakpoint"
Drop this perror call. runto_main will FAIL if appropriate.
Thanks,
Andrew
> + return -1
> +}
> +
> +
> +set bar_first_line [gdb_get_line_number "bar-first-line" ${srcfile3}]
> +set bar_middle_line [gdb_get_line_number "bar-middle-line" ${srcfile3}]
> +set bar_last_line [gdb_get_line_number "bar-last-line" ${srcfile3}]
> +
> +
> +# Set breakpoints in the function bar. Executable has two object files,
> +# and both have a copy of the same source lines. Therefore breakpoints
> +# will have two locations.
> +gdb_breakpoint "${srcfile3}:${bar_first_line}"
> +gdb_breakpoint "${srcfile3}:${bar_last_line}"
> +
> +# Run to the breakpoint in bar.
> +gdb_continue_to_breakpoint "bar_first_line" \
> + ".*${srcfile3}:${bar_first_line}.*"
> +
> +# Jump within the function. Debugger shall be able to jump, even if the
> +# target line is in two different object files. After jump, we will hit
> +# the breakpoint at the last line of bar.
> +gdb_test "jump ${bar_middle_line}" [multi_line \
> + "Continuing at ($hex).*" \
> + "Breakpoint ${decimal}.* at .*${srcfile3}:${bar_last_line}.*"] \
> + "Jump within the objectfile"
> diff --git a/gdb/testsuite/gdb.base/jump_multiple_objfiles.h b/gdb/testsuite/gdb.base/jump_multiple_objfiles.h
> new file mode 100755
> index 00000000000..0a3815e1808
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/jump_multiple_objfiles.h
> @@ -0,0 +1,30 @@
> +/* Copyright (C) 2021-2023 Free Software Foundation, Inc.
> +
> + This file is part of GDB.
> +
> + 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/>. */
> +
> +#ifndef JUMP_MULTIPLE_OBJFILES_H
> +#define JUMP_MULTIPLE_OBJFILES_H
> +
> +static int
> +bar (int n)
> +{
> + int retval = n;
> + retval += 1; /* bar-first-line */
> + retval *= -1; /* bar-middle-line */
> + return retval; /* bar-last-line */
> +}
> +
> +#endif /* JUMP_MULTIPLE_OBJFILES_H */
> diff --git a/gdb/testsuite/gdb.base/jump_multiple_objfiles_foo.c b/gdb/testsuite/gdb.base/jump_multiple_objfiles_foo.c
> new file mode 100755
> index 00000000000..16863c8594b
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/jump_multiple_objfiles_foo.c
> @@ -0,0 +1,24 @@
> +/* This testcase is part of GDB, the GNU debugger.
> +
> + Copyright 2021-2023 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 "jump_multiple_objfiles.h"
> +
> +int
> +foo (int n)
> +{
> + return bar (n);
> +}
> --
> 2.25.1
>
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