http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59039
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2013-11-07
Ever confirmed|0 |1
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Richard Biener from comment #1)
> __builtin_longjmp/setjmp are just longjmp(3) setjmp(3) with their
> constraints.
> They should not be used directly but <setjmp.h> should be.
That was my first impression. But I saw
[hjl@gnu-hsw-1 tmp]$ cat y.c
#include <setjmp.h>
extern jmp_buf buf;
void
foo ()
{
__builtin_setjmp (buf);
}
void
bar ()
{
__builtin_longjmp (buf, 1);
}
[hjl@gnu-hsw-1 tmp]$ gcc -S -O2 y.c
[hjl@gnu-hsw-1 tmp]$ cat y.s
.file "y.c"
.text
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
movq %rsp, buf(%rip)
movq $.L2, buf+8(%rip)
movq %rsp, buf+16(%rip)
ret
.L2:
.L4:
.cfi_endproc
.LFE0:
.size foo, .-foo
.p2align 4,,15
.globl bar
.type bar, @function
bar:
.LFB1:
.cfi_startproc
pushq %rbp
.cfi_def_cfa_offset 16
.cfi_offset 6, -16
movq buf+8(%rip), %rax
movq %rsp, %rbp
.cfi_def_cfa_register 6
movq buf(%rip), %rbp
movq buf+16(%rip), %rsp
jmp *%rax
.cfi_endproc
.LFE1:
.size bar, .-bar
__builtin_longjmp/setjmp only save/restore BP, SP and PC on
x86, x32 and x86-64.
