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[PSEH3]

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Start factoring out compiler support for nested functions (neither CLANG not C++ support it, so we will add some other crazy hacks later ;-))

svn path=/trunk/; revision=62402
This commit is contained in:
Timo Kreuzer 2014-03-02 22:04:15 +00:00
parent 2948ed43c5
commit a12d2d5e6c
2 changed files with 45 additions and 24 deletions
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64
reactos/include/reactos/libs/pseh/pseh3.h
View file

@ -89,7 +89,7 @@ unsigned long __cdecl __attribute__((error("Can only be used inside an exception
void * __cdecl __attribute__((error("Can only be used inside an exception filter."))) _exception_info(void);
/* This attribute allows automatic cleanup of the registered frames */
#define _SEH3$_AUTO_CLEANUP __attribute__((cleanup(_SEH3$_AutoCleanup)))
#define _SEH3$_AUTO_CLEANUP __attribute__((cleanup(_SEH3$_Unregister)))
/* CLANG specific definitions! */
#ifdef __clang__
@ -133,6 +133,8 @@ _SEH3$_RegisterTryLevelWithNonVolatiles(
} \
} while(0)
#define _SEH3$_SCARE_GCC()
#else /* !__clang__ */
#define _SEH3$_ASM_GOTO(_Label, ...) asm goto ("#\n" : : : "memory", ## __VA_ARGS__ : _Label)
@ -155,14 +157,49 @@ _SEH3$_RegisterTryLevelWithNonVolatiles(
: "ecx", "edx", "memory" \
: _SEH3$_l_HandlerTarget)
/* Define the registers that get clobbered, when reaching the __except block.
We specify ebp on optimized builds without frame pointer, since it will be
used by GCC as a general purpose register then. */
#if defined(__OPTIMIZE__) && defined(_ALLOW_OMIT_FRAME_POINTER)
#define _SEH3$_CLOBBER_ON_EXCEPTION "ebp", "ebx", "ecx", "edx", "esi", "edi", "flags", "memory"
#else
#define _SEH3$_CLOBBER_ON_EXCEPTION "ebx", "ecx", "edx", "esi", "edi", "flags", "memory"
#endif
/* This construct scares GCC so much, that it will stop moving code
around into places that are never executed. */
#define _SEH3$_SCARE_GCC() \
void *plabel; \
_SEH3$_ASM_GOTO(_SEH3$_l_BeforeTry); \
_SEH3$_ASM_GOTO(_SEH3$_l_HandlerTarget); \
_SEH3$_ASM_GOTO(_SEH3$_l_OnException); \
asm volatile ("#" : "=a"(plabel) : "p"(&&_SEH3$_l_BeforeTry), "p"(&&_SEH3$_l_HandlerTarget), "p"(&&_SEH3$_l_OnException) \
: _SEH3$_CLOBBER_ON_EXCEPTION ); \
goto _SEH3$_l_OnException;
#endif /* __clang__ */
/* Neither CLANG nor C++ support nested functions */
#if defined(__cplusplus) || defined(__clang__)
/* Use the global unregister function */
void
__attribute__((regparm(1)))
_SEH3$_Unregister(
volatile SEH3$_REGISTRATION_FRAME *Frame);
/* These are only dummies here */
#define _SEH3$_DECLARE_CLEANUP_FUNC(_Name)
#define _SEH3$_DEFINE_CLEANUP_FUNC(_Name)
#define _SEH3$_DECLARE_FILTER_FUNC(_Name)
#define _SEH3$_DEFINE_DUMMY_FINALLY(_Name)
#else /* __cplusplus || __clang__ */
#define _SEH3$_DECLARE_EXCEPT_INTRINSICS() \
inline __attribute__((always_inline, gnu_inline)) \
unsigned long _exception_code() { return _SEH3$_TrylevelFrame.ExceptionPointers->ExceptionRecord->ExceptionCode; }
/* On GCC the filter function is a nested function with __fastcall calling
convention. The eax register contains a base address the function uses
to address the callers stack frame. __fastcall is chosen, because it gives
@ -219,25 +256,8 @@ _SEH3$_RegisterTryLevelWithNonVolatiles(
_SEH3$_FinallyFunction(1); \
}
/* Define the registers that get clobbered, when reaching the __except block.
We specify ebp on optimized builds without frame pointer, since it will be
used by GCC as a general purpose register then. */
#if defined(__OPTIMIZE__) && defined(_ALLOW_OMIT_FRAME_POINTER)
#define _SEH3$_CLOBBER_ON_EXCEPTION "ebp", "ebx", "ecx", "edx", "esi", "edi", "flags", "memory"
#else
#define _SEH3$_CLOBBER_ON_EXCEPTION "ebx", "ecx", "edx", "esi", "edi", "flags", "memory"
#endif
#endif /* __cplusplus || __clang__ */
/* This construct scares GCC so much, that it will stop moving code
around into places that are never executed. */
#define _SEH3$_SCARE_GCC() \
void *plabel; \
_SEH3$_ASM_GOTO(_SEH3$_l_BeforeTry); \
_SEH3$_ASM_GOTO(_SEH3$_l_HandlerTarget); \
_SEH3$_ASM_GOTO(_SEH3$_l_OnException); \
asm volatile ("#" : "=a"(plabel) : "p"(&&_SEH3$_l_BeforeTry), "p"(&&_SEH3$_l_HandlerTarget), "p"(&&_SEH3$_l_OnException) \
: _SEH3$_CLOBBER_ON_EXCEPTION ); \
goto _SEH3$_l_OnException;
#define _SEH3_TRY \
@ -259,7 +279,7 @@ _SEH3$_RegisterTryLevelWithNonVolatiles(
}; \
\
/* Forward declaration of the auto cleanup function */ \
_SEH3$_DECLARE_CLEANUP_FUNC(_SEH3$_AutoCleanup); \
_SEH3$_DECLARE_CLEANUP_FUNC(_SEH3$_Unregister); \
\
/* Allocate a registration frame */ \
volatile SEH3$_REGISTRATION_FRAME _SEH3$_AUTO_CLEANUP _SEH3$_TrylevelFrame; \
@ -355,7 +375,7 @@ _SEH3$_RegisterTryLevelWithNonVolatiles(
_SEH3$_ASM_GOTO(_SEH3$_l_OnException); \
\
/* Implementation of the auto cleanup function */ \
_SEH3$_DEFINE_CLEANUP_FUNC(_SEH3$_AutoCleanup); \
_SEH3$_DEFINE_CLEANUP_FUNC(_SEH3$_Unregister); \
\
/* Close the outer scope */ \
} while (0);

5
reactos/lib/pseh/i386/pseh3.c
View file

@ -50,8 +50,9 @@ C_ASSERT(SEH3_REGISTRATION_FRAME_Ebp == FIELD_OFFSET(SEH3$_REGISTRATION_FRAME, E
C_ASSERT(SEH3_SCOPE_TABLE_Filter == FIELD_OFFSET(SEH3$_SCOPE_TABLE, Filter));
C_ASSERT(SEH3_SCOPE_TABLE_Target == FIELD_OFFSET(SEH3$_SCOPE_TABLE, Target));
static inline
void _SEH3$_Unregister(
void
__attribute__((regparm(1)))
_SEH3$_Unregister(
volatile SEH3$_REGISTRATION_FRAME *Frame)
{
if (Frame->Handler)