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change jmp_buf to share an underlying type and struct tag with sigjmp_buf

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this is necessary to meet the C++ ABI target. alternatives were
considered to avoid the size increase for non-sig jmp_buf objects, but
they seemed to have worse properties. moreover, the relative size
increase is only extreme on x86[_64]; one way of interpreting this is
that, if the size increase from this patch makes jmp_buf use too much
memory, then the program was already using too much memory when built
for non-x86 archs.
This commit is contained in:
Rich Felker 2013-07-24 02:17:02 -04:00
commit 9693501c15
9 changed files with 14 additions and 15 deletions
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13
include/setjmp.h
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@ -9,27 +9,26 @@ extern "C" {
#include <bits/setjmp.h>
typedef struct __jmp_buf_tag {
__jmp_buf __jb;
unsigned long __fl;
unsigned long __ss[128/sizeof(long)];
} jmp_buf[1];
#if defined(_POSIX_SOURCE) || defined(_POSIX_C_SOURCE) \
|| defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
typedef struct __sigjmp_buf {
jmp_buf __jb;
unsigned long __fl;
unsigned long __ss[128/sizeof(long)];
} sigjmp_buf[1];
typedef jmp_buf sigjmp_buf;
int sigsetjmp (sigjmp_buf, int);
_Noreturn void siglongjmp (sigjmp_buf, int);
#endif
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) \
|| defined(_BSD_SOURCE)
int _setjmp (jmp_buf);
_Noreturn void _longjmp (jmp_buf, int);
#endif
int setjmp (jmp_buf);
_Noreturn void longjmp (jmp_buf, int);