old-cross-binutils/gdb/testsuite/gdb.btrace/tailcall-only.c

54 lines
1.2 KiB
C
Raw Normal View History

btrace, frame: fix crash in get_frame_type In skip_artificial_frames we repeatedly call get_prev_frame_always until we get a non-inline and non-tailcall frame assuming that there must be such a frame eventually. For record targets, however, we may have a frame chain that consists only of artificial frames. This leads to a crash in get_frame_type when dereferencing a NULL frame pointer. Change skip_artificial_frames and skip_tailcall_frames to return NULL in such a case and modify each caller to cope with a NULL return. In frame_unwind_caller_pc and frame_unwind_caller_arch, we simply assert that the returned value is not NULL. Their caller was supposed to check frame_unwind_caller_id before calling those functions. In other cases, we thrown an error. In infcmd further move the skip_tailcall_frames call to the forward-stepping case since we don't need a frame for reverse execution and we don't want to fail because of that. Reverse-finish does make sense for a tailcall frame. gdb/ * frame.h (skip_tailcall_frames): Update comment. * frame.c (skip_artificial_frames, skip_tailcall_frames): Return NULL if only artificial frames are found. Update comment. (frame_unwind_caller_id): Handle NULL return. (frame_unwind_caller_pc, frame_unwind_caller_arch): Assert that skip_artificial_frames does not return NULL. (frame_pop): Add an error if only tailcall frames are found. * infcmd.c (finish_command): Move skip_tailcall_frames call into forward- execution case. Add an error if only tailcall frames are found. testsuite/ * gdb.btrace/tailcall-only.exp: New. * gdb.btrace/tailcall-only.c: New. * gdb.btrace/x86_64-tailcall-only.S: New. * gdb.btrace/i686-tailcall-only.S: New.
2016-01-26 13:58:44 +00:00
/* This testcase is part of GDB, the GNU debugger.
Copyright 2016 Free Software Foundation, Inc.
Contributed by Intel Corp. <markus.t.metzger@intel.com>
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 __attribute__ ((noinline)) int
bar_1 (void)
{
return 42;
}
static __attribute__ ((noinline)) int
bar (void)
{
return bar_1 ();
}
static __attribute__ ((noinline)) int
foo_1 (void)
{
return bar ();
}
static __attribute__ ((noinline)) int
foo (void)
{
return foo_1 ();
}
int
main (void)
{
int answer;
answer = foo ();
answer += 1;
return answer;
}