Author: tkreuzer Date: Sat Aug 25 22:19:02 2012 New Revision: 57159
URL: http://svn.reactos.org/svn/reactos?rev=57159&view=rev Log: [PSEH2] 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.
Modified: trunk/reactos/include/reactos/libs/pseh/pseh2.h
Modified: trunk/reactos/include/reactos/libs/pseh/pseh2.h URL: http://svn.reactos.org/svn/reactos/trunk/reactos/include/reactos/libs/pseh/p... ============================================================================== --- trunk/reactos/include/reactos/libs/pseh/pseh2.h [iso-8859-1] (original) +++ trunk/reactos/include/reactos/libs/pseh/pseh2.h [iso-8859-1] Sat Aug 25 22:19:02 2012 @@ -108,6 +108,14 @@
#ifdef __cplusplus } +#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 */ @@ -246,6 +254,7 @@ auto __SEH_DECLARE_FINALLY(_SEHFinally);
#define _SEH2_TRY \ + __PREVENT_GCC_FROM_INLINING_SEH_FUNCTIONS() \ __SEH_BEGIN_SCOPE \ { \ __SEH_SCOPE_LOCALS; \