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Sometimes, in the GDB testsuite, we want to test the ability of specific unwinders to handle some piece of code. Usually this is done by trying to outsmart GDB, or by coercing the compiler to remove information that GDB would rely on. Both approaches have problems as GDB gets smarter with time, and that compilers might differ in version and behavior, or simply introduce new useful information. This was requested back in 2003 in PR backtrace/8434. To improve our ability to thoroughly test GDB, this patch introduces a new maintenance command that allows a user to disable some unwinders, based on either the name of the unwinder or on its class. With this change, it will now be possible for GDB to not find any frame unwinders for a given frame, which would previously cause GDB to assert. GDB will now check if any frame unwinder has been disabled, and if some has, it will just error out instead of asserting. Unwinders can be disabled or re-enabled in 3 different ways: * Disabling/enabling all at once (using '-all'). * By specifying an unwinder class to be disabled (option '-class'). * By specifying the name of an unwinder (option '-name'). If you give no options to the command, GDB assumes the input is an unwinder class. '-class' would make no difference if used, is just here for completeness. This command is meant to be used once the inferior is already at the desired location for the test. An example session would be: (gdb) start Temporary breakpoint 1, main () at omp.c:17 17 func(); (gdb) maint frame-unwinder disable ARCH (gdb) bt \#0 main () at omp.c:17 (gdb) maint frame-unwinder enable ARCH (gdb) cont Continuing. This commit is a more generic version of commit3c3bb0580b, and so, based on the final paragraph of the commit message: gdb: Add switch to disable DWARF stack unwinders <...> If in the future we find ourselves adding more switches to disable different unwinders, then we should probably move to a more generic solution, and remove this patch. this patch also reverts3c3bb0580bBug: https://sourceware.org/bugzilla/show_bug.cgi?id=8434 Co-Authored-By: Andrew Burgess <aburgess@redhat.com> Reviewed-By: Eli Zaretskii <eliz@gnu.org> Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> Approved-By: Andrew Burgess <aburgess@redhat.com> temp adding completion
23 lines
777 B
C
23 lines
777 B
C
/* This testcase is part of GDB, the GNU debugger.
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Copyright 2025 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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int
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main ()
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{
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return 0;
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}
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