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[PSEH2]

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PSEH2 uses a special mechanism to deal with nested try blocks inside the same function. Instead of pushing a second exception registration record on the exception list, it uses an internal pointer to handle the different try-levels.
But when a function using SEH is inlined, the resulting code will push 2 registration frames on the stack. Now it happens with GCC 4.7.1 that these frames get shuffled on the stack, putting one for the inner try on a higher stack address. This is something that RtlUnwind regards as a bug and throws a STATUS_INVALID_UNWIND_TARGET exception. This was the reason for the crashing PSEH2_TEST, when compiled with GCC 4.7.1.
To fix this, I added a mechanism that will prevent functions using SEH from being inlined.

svn path=/trunk/; revision=57159
This commit is contained in:
Timo Kreuzer 2012-08-25 22:19:02 +00:00
parent a057794799
commit dcc3ed4985
1 changed files with 9 additions and 0 deletions
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9
reactos/include/reactos/libs/pseh/pseh2.h
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@ -110,6 +110,14 @@ extern void __cdecl _SEH2Return(void);
}
#endif
/* Prevent gcc from inlining functions that use SEH. */
#if ((__GNUC__ >= 4) && (__GNUC_MINOR__ >= 7))
extern inline __attribute__((always_inline)) __attribute__((returns_twice)) void _SEH_DontInline() {}
#define __PREVENT_GCC_FROM_INLINING_SEH_FUNCTIONS() _SEH_DontInline();
#else
#define __PREVENT_GCC_FROM_INLINING_SEH_FUNCTIONS()
#endif
/* A no-op side effect that scares GCC */
#define __SEH_SIDE_EFFECT __asm__ __volatile__("#")
@ -246,6 +254,7 @@ extern void __cdecl _SEH2Return(void);
auto __SEH_DECLARE_FINALLY(_SEHFinally);
#define _SEH2_TRY \
__PREVENT_GCC_FROM_INLINING_SEH_FUNCTIONS() \
__SEH_BEGIN_SCOPE \
{ \
__SEH_SCOPE_LOCALS; \