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Sweden-Number/include/wine/exception.h

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/*
* Wine exception handling
*
* Copyright (c) 1999 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#ifndef __WINE_WINE_EXCEPTION_H
#define __WINE_WINE_EXCEPTION_H
#include <setjmp.h>
#include <windef.h>
#include <excpt.h>
#ifdef __cplusplus
extern "C" {
#endif
/* The following definitions allow using exceptions in Wine and Winelib code
*
* They should be used like this:
*
* __TRY
* {
* do some stuff that can raise an exception
* }
* __EXCEPT(filter_func)
* {
* handle the exception here
* }
* __ENDTRY
*
* or
*
* __TRY
* {
* do some stuff that can raise an exception
* }
* __FINALLY(finally_func)
*
* The filter_func and finally_func functions must be defined like this:
*
* LONG CALLBACK filter_func( PEXCEPTION_POINTERS __eptr ) { ... }
*
* void CALLBACK finally_func( BOOL __normal ) { ... }
*
* The filter function must return one of the EXCEPTION_* code; it can
* use GetExceptionInformation() and GetExceptionCode() to retrieve the
* exception info.
*
* Warning: inside a __TRY or __EXCEPT block, 'break' or 'continue' statements
* break out of the current block. You cannot use 'return', 'goto'
* or 'longjmp' to leave a __TRY block, as this will surely crash.
* You can use them to leave a __EXCEPT block though.
*
* -- AJ
*/
/* Define this if you want to use your compiler built-in __try/__except support.
* This is only useful when compiling to a native Windows binary, as the built-in
* compiler exceptions will most certainly not work under Winelib.
*/
#ifdef USE_COMPILER_EXCEPTIONS
#define __TRY __try
#define __EXCEPT(func) __except((func)(GetExceptionInformation()))
#define __FINALLY(func) __finally { (func)(!AbnormalTermination()); }
#define __ENDTRY /*nothing*/
#define __EXCEPT_PAGE_FAULT __except(GetExceptionCode() == EXCEPTION_ACCESS_VIOLATION)
#define __EXCEPT_ALL __except(EXCEPTION_EXECUTE_HANDLER)
#else /* USE_COMPILER_EXCEPTIONS */
#ifndef __GNUC__
#define __attribute__(x) /* nothing */
#endif
#if defined(__MINGW32__) || defined(__CYGWIN__)
#define sigjmp_buf jmp_buf
#define sigsetjmp(buf,sigs) setjmp(buf)
#define siglongjmp(buf,val) longjmp(buf,val)
#endif
#define __TRY \
do { __WINE_FRAME __f; \
int __first = 1; \
for (;;) if (!__first) \
{ \
do {
#define __EXCEPT(func) \
} while(0); \
__wine_pop_frame( &__f.frame ); \
break; \
} else { \
__f.frame.Handler = __wine_exception_handler; \
__f.u.filter = (func); \
if (sigsetjmp( __f.jmp, 0 )) { \
const __WINE_FRAME * const __eptr __attribute__((unused)) = &__f; \
do {
/* convenience handler for page fault exceptions */
#define __EXCEPT_PAGE_FAULT \
} while(0); \
__wine_pop_frame( &__f.frame ); \
break; \
} else { \
__f.frame.Handler = __wine_exception_handler_page_fault; \
if (sigsetjmp( __f.jmp, 0 )) { \
const __WINE_FRAME * const __eptr __attribute__((unused)) = &__f; \
do {
/* convenience handler for all exception */
#define __EXCEPT_ALL \
} while(0); \
__wine_pop_frame( &__f.frame ); \
break; \
} else { \
__f.frame.Handler = __wine_exception_handler_all; \
if (sigsetjmp( __f.jmp, 0 )) { \
const __WINE_FRAME * const __eptr __attribute__((unused)) = &__f; \
do {
#define __ENDTRY \
} while (0); \
break; \
} \
__wine_push_frame( &__f.frame ); \
__first = 0; \
} \
} while (0);
#define __FINALLY(func) \
} while(0); \
__wine_pop_frame( &__f.frame ); \
(func)(1); \
break; \
} else { \
__f.frame.Handler = __wine_finally_handler; \
__f.u.finally_func = (func); \
__wine_push_frame( &__f.frame ); \
__first = 0; \
} \
} while (0);
typedef LONG (CALLBACK *__WINE_FILTER)(PEXCEPTION_POINTERS);
typedef void (CALLBACK *__WINE_FINALLY)(BOOL);
#define GetExceptionInformation() (__eptr)
#define GetExceptionCode() (__eptr->ExceptionRecord->ExceptionCode)
#define AbnormalTermination() (!__normal)
typedef struct __tagWINE_FRAME
{
EXCEPTION_REGISTRATION_RECORD frame;
union
{
/* exception data */
__WINE_FILTER filter;
/* finally data */
__WINE_FINALLY finally_func;
} u;
sigjmp_buf jmp;
/* hack to make GetExceptionCode() work in handler */
DWORD ExceptionCode;
const struct __tagWINE_FRAME *ExceptionRecord;
} __WINE_FRAME;
#endif /* USE_COMPILER_EXCEPTIONS */
static inline EXCEPTION_REGISTRATION_RECORD *__wine_push_frame( EXCEPTION_REGISTRATION_RECORD *frame )
{
#if defined(__GNUC__) && defined(__i386__)
EXCEPTION_REGISTRATION_RECORD *prev;
__asm__ __volatile__(".byte 0x64\n\tmovl (0),%0"
"\n\tmovl %0,(%1)"
"\n\t.byte 0x64\n\tmovl %1,(0)"
: "=&r" (prev) : "r" (frame) : "memory" );
return prev;
#else
NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
frame->Prev = teb->ExceptionList;
teb->ExceptionList = frame;
return frame->Prev;
#endif
}
static inline EXCEPTION_REGISTRATION_RECORD *__wine_pop_frame( EXCEPTION_REGISTRATION_RECORD *frame )
{
#if defined(__GNUC__) && defined(__i386__)
__asm__ __volatile__(".byte 0x64\n\tmovl %0,(0)"
: : "r" (frame->Prev) : "memory" );
return frame->Prev;
#else
NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
teb->ExceptionList = frame->Prev;
return frame->Prev;
#endif
}
static inline EXCEPTION_REGISTRATION_RECORD *__wine_get_frame(void)
{
#if defined(__GNUC__) && defined(__i386__)
EXCEPTION_REGISTRATION_RECORD *ret;
__asm__ __volatile__(".byte 0x64\n\tmovl (0),%0" : "=r" (ret) );
return ret;
#else
NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
return teb->ExceptionList;
#endif
}
/* Exception handling flags - from OS/2 2.0 exception handling */
/* Win32 seems to use the same flags as ExceptionFlags in an EXCEPTION_RECORD */
#define EH_NONCONTINUABLE 0x01
#define EH_UNWINDING 0x02
#define EH_EXIT_UNWIND 0x04
#define EH_STACK_INVALID 0x08
#define EH_NESTED_CALL 0x10
/* Wine-specific exceptions codes */
#define EXCEPTION_WINE_STUB 0x80000100 /* stub entry point called */
#define EXCEPTION_WINE_ASSERTION 0x80000101 /* assertion failed */
/* unhandled return status from vm86 mode */
#define EXCEPTION_VM86_INTx 0x80000110
#define EXCEPTION_VM86_STI 0x80000111
#define EXCEPTION_VM86_PICRETURN 0x80000112
extern void __wine_enter_vm86( CONTEXT *context );
#ifndef USE_COMPILER_EXCEPTIONS
NTSYSAPI void WINAPI RtlUnwind(PVOID,PVOID,PEXCEPTION_RECORD,PVOID);
static inline void DECLSPEC_NORETURN __wine_unwind_target(void)
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)__wine_get_frame();
__wine_pop_frame( &wine_frame->frame );
siglongjmp( wine_frame->jmp, 1 );
}
/* wrapper for RtlUnwind since it clobbers registers on Windows */
static inline void DECLSPEC_NORETURN __wine_rtl_unwind( EXCEPTION_REGISTRATION_RECORD* frame,
EXCEPTION_RECORD *record,
void (*target)(void) )
{
#if defined(__GNUC__) && defined(__i386__)
int dummy1, dummy2, dummy3, dummy4;
__asm__ __volatile__("pushl %%ebp\n\t"
"pushl %%ebx\n\t"
"pushl $0\n\t"
"pushl %3\n\t"
"pushl %2\n\t"
"pushl %1\n\t"
"call *%0\n\t"
"popl %%ebx\n\t"
"popl %%ebp"
: "=a" (dummy1), "=S" (dummy2), "=D" (dummy3), "=c" (dummy4)
: "0" (RtlUnwind), "1" (frame), "2" (target), "3" (record)
: "edx", "memory" );
#else
RtlUnwind( frame, target, record, 0 );
#endif
for (;;) target();
}
static inline void DECLSPEC_NORETURN __wine_unwind_frame( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
/* hack to make GetExceptionCode() work in handler */
wine_frame->ExceptionCode = record->ExceptionCode;
wine_frame->ExceptionRecord = wine_frame;
__wine_rtl_unwind( frame, record, __wine_unwind_target );
}
static inline DWORD __wine_exception_handler( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
EXCEPTION_POINTERS ptrs;
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
ptrs.ExceptionRecord = record;
ptrs.ContextRecord = context;
switch(wine_frame->u.filter( &ptrs ))
{
case EXCEPTION_CONTINUE_SEARCH:
return ExceptionContinueSearch;
case EXCEPTION_CONTINUE_EXECUTION:
return ExceptionContinueExecution;
case EXCEPTION_EXECUTE_HANDLER:
break;
}
__wine_unwind_frame( record, frame );
}
static inline DWORD __wine_exception_handler_page_fault( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
if (record->ExceptionCode != STATUS_ACCESS_VIOLATION)
return ExceptionContinueSearch;
__wine_unwind_frame( record, frame );
}
static inline DWORD __wine_exception_handler_all( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND | EH_NESTED_CALL))
return ExceptionContinueSearch;
__wine_unwind_frame( record, frame );
}
static inline DWORD __wine_finally_handler( EXCEPTION_RECORD *record,
EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context,
EXCEPTION_REGISTRATION_RECORD **pdispatcher )
{
if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
__WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
wine_frame->u.finally_func( FALSE );
}
return ExceptionContinueSearch;
}
#endif /* USE_COMPILER_EXCEPTIONS */
#ifdef __cplusplus
}
#endif
#endif /* __WINE_WINE_EXCEPTION_H */
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