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re PR middle-end/26983 (Missing label with builtin_setjmp/longjmp)

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PR middle-end/26983

gcc/
	* builtins.c (expand_builtin_setjmp): Force next_lab to be
	preserved.

testsuite/
	* gcc.dg/pr26983.c: New test.

From-SVN: r116826
This commit is contained in:
Steven Bosscher 2006-09-10 20:08:58 +00:00
parent 9226543b67
commit 4fe337f67a
4 changed files with 36 additions and 0 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2006-09-10 Steven Bosscher <steven@gcc.gnu.org>
PR middle-end/26983
* builtins.c (expand_builtin_setjmp): Force next_lab to be
preserved.
2006-09-10 Richard Sandiford <richard@codesourcery.com> 2006-09-10 Richard Sandiford <richard@codesourcery.com>
PR target/29006 PR target/29006

6
gcc/builtins.c
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@ -760,6 +760,12 @@ expand_builtin_setjmp (tree arglist, rtx target)
emit_label (next_lab); emit_label (next_lab);
/* Because setjmp and longjmp are not represented in the CFG, a cfgcleanup
may find that the basic block starting with NEXT_LAB is unreachable.
The whole block, along with NEXT_LAB, would be removed (see PR26983).
Make sure that never happens. */
LABEL_PRESERVE_P (next_lab) = 1;
expand_builtin_setjmp_receiver (next_lab); expand_builtin_setjmp_receiver (next_lab);
/* Set TARGET to one. */ /* Set TARGET to one. */

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2006-09-10 Steven Bosscher <steven@gcc.gnu.org>
PR middle-end/26983
* gcc.dg/pr26983.c: New test.
2006-09-10 Richard Sandiford <richard@codesourcery.com> 2006-09-10 Richard Sandiford <richard@codesourcery.com>
PR target/29006 PR target/29006

19
gcc/testsuite/gcc.dg/pr26983.c Normal file
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@ -0,0 +1,19 @@
/* { dg-do link } */
/* This used to cause a linker failure because GCC would output
assembler code referencing labels that it had not output. */
void *jmpbuf[6];
void
foo (void)
{
__builtin_setjmp (jmpbuf);
}
int
main (void)
{
return 0;
}