------- Comment #8 from slyfox at inbox dot ru 2009-08-23 11:12 -------
(In reply to comment #7)
> Subject: Bug 40718
>
> Author: uros
> Date: Sun Aug 23 09:46:00 2009
> New Revision: 151028
>
> URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=151028
> Log:
> PR target/40718
> * config/i386/i386.c (*call_pop_1): Disable for sibling calls.
> (*sibcall_pop_1): New insn pattern.
>
> testsuite/ChangeLog:
>
> PR target/40718
> * gcc.target/i386/pr40718.c: New test.
>
>
> Added:
> trunk/gcc/testsuite/gcc.target/i386/pr40718.c
> Modified:
> trunk/gcc/ChangeLog
> trunk/gcc/config/i386/i386.md
> trunk/gcc/testsuite/ChangeLog
>
This patch fixes for me Dmitry's sample, but does not fix mine. Still SIGSEGVs.
I've managed to
place whole testcase in one file:
$ g++ -O1 -foptimize-sibling-calls -m32 -DCALLTYPE="__attribute__((stdcall))"
main.cc -o show_the_bug
$ ./show_the_bug
Segmentation fault
$ cat main.cc
#define CALLTYPE __attribute__((stdcall))
struct Base {
virtual unsigned long CALLTYPE base_do1(unsigned long, unsigned long)
__attribute__((noinline))
{
return 4;
}
};
static Base bi;
Base * glo_ptr_to_base = &bi;
struct Stuff {
void CALLTYPE do_stuff(unsigned long param1, unsigned long param2)
__attribute__((noinline))
{
if (param1 == 0xFFFFFFFE)
{
return;
}
glo_ptr_to_base->base_do1(param1, param2);
}
};
int
main()
{
Stuff o;
o.do_stuff(1, 32);
return 0;
}
-----------------------------------------------
_ZN5Stuff8do_stuffEmm:
.LFB1:
.cfi_startproc
.cfi_personality 0x0,__gxx_personality_v0
pushl %ebp
.cfi_def_cfa_offset 8
movl %esp, %ebp
.cfi_offset 5, -8
.cfi_def_cfa_register 5
pushl %ebx
subl $4, %esp
movl 12(%ebp), %eax
cmpl $-2, %eax
je .L5
.cfi_offset 3, -12
movl glo_ptr_to_base, %edx
movl %edx, 8(%ebp)
movl -4(%ebp), %ebx
leave
jmp *(%ebx)
.L5:
movl -4(%ebp), %ebx
leave
ret $12
.cfi_endproc
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40718
