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730f5068f5
Consider the following test-case:
...
$ cat hello.c
int main()
{
printf("hello ");
#include "world.inc"
$ cat world.inc
printf("world\n");
return 0;
}
$ gcc -g hello.c
...
The line table for the compilation unit, consisting just of
function main, is translated into these two gdb line tables, one for hello.c
and one for world.inc:
...
compunit_symtab: hello.c
symtab: hello.c
INDEX LINE REL-ADDRESS UNREL-ADDRESS IS-STMT PROLOGUE-END EPILOGUE-BEGIN
0 3 0x400557 0x400557 Y
1 4 0x40055b 0x40055b Y
2 END 0x40056a 0x40056a Y
compunit_symtab: hello.c
symtab: world.inc
INDEX LINE REL-ADDRESS UNREL-ADDRESS IS-STMT PROLOGUE-END EPILOGUE-BEGIN
0 1 0x40056a 0x40056a Y
1 2 0x400574 0x400574 Y
2 3 0x400579 0x400579 Y
3 END 0x40057b 0x40057b Y
...
The epilogue of main starts at 0x400579:
...
400579: 5d pop %rbp
40057a: c3 ret
...
Now, say we have an epilogue_begin marker in the line table at 0x400579.
We won't find it using find_epilogue_using_linetable, because it does:
...
const struct symtab_and_line sal = find_pc_line (start_pc, 0);
...
which gets us the line table for hello.c.
Fix this by using "find_pc_line (end_pc - 1, 0)" instead.
Tested on x86_64-linux.
Co-Authored-By: Tom de Vries <tdevries@suse.de>
PR symtab/31622
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=31622
52 lines
1.5 KiB
C++
52 lines
1.5 KiB
C++
/* Copyright 2023-2024 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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void
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__attribute__((used))
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trivial (void)
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{
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asm ("trivial_label: .global trivial_label"); /* trivial function */
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}
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char global;
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void
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watch (void)
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{ /* watch start */
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asm ("watch_label: .global watch_label");
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asm ("mov $0x0, %rax");
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int local = 0; /* watch prologue */
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asm ("watch_start: .global watch_start");
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asm ("mov $0x1, %rax");
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local = 1; /* watch assign */
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asm ("watch_reassign: .global watch_reassign");
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asm ("mov $0x2, %rax");
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local = 2; /* watch reassign */
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asm ("watch_end: .global watch_end"); /* watch end */
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}
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int
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main (void)
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{ /* main prologue */
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asm ("main_label: .global main_label");
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global = 0;
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asm ("main_fun_call: .global main_fun_call");
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watch (); /* main function call */
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asm ("main_epilogue: .global main_epilogue");
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global = 10;
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return 0; /* main end */
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}
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