reactos/include/wine/exception.h

   1 /*
   2  * Wine exception handling
   3  *
   4  * Copyright (c) 1999 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef __WINE_WINE_EXCEPTION_H
  22 #define __WINE_WINE_EXCEPTION_H
  23
  24 #include <setjmp.h>
  25 #include <windef.h>
  26 #include <excpt.h>
  27 #include <wine/port.h>
  28
  29 /* The following definitions allow using exceptions in Wine and Winelib code
  30  *
  31  * They should be used like this:
  32  *
  33  * __TRY
  34  * {
  35  *     do some stuff that can raise an exception
  36  * }
  37  * __EXCEPT(filter_func,param)
  38  * {
  39  *     handle the exception here
  40  * }
  41  * __ENDTRY
  42  *
  43  * or
  44  *
  45  * __TRY
  46  * {
  47  *     do some stuff that can raise an exception
  48  * }
  49  * __FINALLY(finally_func,param)
  50  *
  51  * The filter_func must be defined with the WINE_EXCEPTION_FILTER
  52  * macro, and return one of the EXCEPTION_* code; it can use
  53  * GetExceptionInformation and GetExceptionCode to retrieve the
  54  * exception info.
  55  *
  56  * The finally_func must be defined with the WINE_FINALLY_FUNC macro.
  57  *
  58  * Warning: inside a __TRY or __EXCEPT block, 'break' or 'continue' statements
  59  *          break out of the current block. You cannot use 'return', 'goto'
  60  *          or 'longjmp' to leave a __TRY block, as this will surely crash.
  61  *          You can use them to leave a __EXCEPT block though.
  62  *
  63  * -- AJ
  64  */
  65
  66 /* Define this if you want to use your compiler built-in __try/__except support.
  67  * This is only useful when compiling to a native Windows binary, as the built-in
  68  * compiler exceptions will most certainly not work under Winelib.
  69  */
  70 #ifdef USE_COMPILER_EXCEPTIONS
  71
  72 #define __TRY __try
  73 #define __EXCEPT(func) __except((func)(GetExceptionInformation()))
  74 #define __FINALLY(func) __finally { (func)(!AbnormalTermination()); }
  75 #define __ENDTRY /*nothing*/
  76
  77 #else  /* USE_COMPILER_EXCEPTIONS */
  78
  79 #ifndef __GNUC__
  80 #define __attribute__(x) /* nothing */
  81 #endif
  82
  83 #define __TRY \
  84     do { __WINE_FRAME __f; \
  85          int __first = 1; \
  86          for (;;) if (!__first) \
  87          { \
  88              do {
  89
  90 #define __EXCEPT(func) \
  91              } while(0); \
  92              __wine_pop_frame( &__f.frame ); \
  93              break; \
  94          } else { \
  95              __f.frame.Handler = __wine_exception_handler; \
  96              __f.u.filter = (func); \
  97              __wine_push_frame( &__f.frame ); \
  98              if (sigsetjmp( __f.jmp, 1 )) { \
  99                  const __WINE_FRAME * const __eptr __attribute__((unused)) = &__f; \
 100                  do {
 101
 102 #define __ENDTRY \
 103                  } while (0); \
 104                  break; \
 105              } \
 106              __first = 0; \
 107          } \
 108     } while (0);
 109
 110 #define __FINALLY(func) \
 111              } while(0); \
 112              __wine_pop_frame( &__f.frame ); \
 113              (func)(1); \
 114              break; \
 115          } else { \
 116              __f.frame.Handler = __wine_finally_handler; \
 117              __f.u.finally_func = (func); \
 118              __wine_push_frame( &__f.frame ); \
 119              __first = 0; \
 120          } \
 121     } while (0);
 122
 123
 124 typedef DWORD (CALLBACK *__WINE_FILTER)(PEXCEPTION_POINTERS);
 125 typedef void (CALLBACK *__WINE_FINALLY)(BOOL);
 126
 127 #define WINE_EXCEPTION_FILTER(func) DWORD WINAPI func( EXCEPTION_POINTERS *__eptr )
 128 #define WINE_FINALLY_FUNC(func) void WINAPI func( BOOL __normal )
 129
 130 #define GetExceptionInformation() (__eptr)
 131 #define GetExceptionCode()        (__eptr->ExceptionRecord->ExceptionCode)
 132
 133 #undef AbnormalTermination
 134 #define AbnormalTermination()     (!__normal)
 135
 136 typedef struct __tagWINE_FRAME
 137 {
 138     EXCEPTION_REGISTRATION_RECORD frame;
 139     union
 140     {
 141         /* exception data */
 142         __WINE_FILTER filter;
 143         /* finally data */
 144         __WINE_FINALLY finally_func;
 145     } u;
 146     sigjmp_buf jmp;
 147     /* hack to make GetExceptionCode() work in handler */
 148     DWORD ExceptionCode;
 149     const struct __tagWINE_FRAME *ExceptionRecord;
 150 } __WINE_FRAME;
 151
 152 extern DWORD __wine_exception_handler( PEXCEPTION_RECORD record, EXCEPTION_REGISTRATION_RECORD *frame,
 153                                        CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher );
 154 extern DWORD __wine_finally_handler( PEXCEPTION_RECORD record, EXCEPTION_REGISTRATION_RECORD *frame,
 155                                      CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **pdispatcher );
 156
 157 #endif /* USE_COMPILER_EXCEPTIONS */
 158
 159 static inline EXCEPTION_REGISTRATION_RECORD *__wine_push_frame( EXCEPTION_REGISTRATION_RECORD *frame )
 160 {
 161 #if defined(__GNUC__) && defined(__i386__)
 162     EXCEPTION_REGISTRATION_RECORD *prev;
 163     __asm__ __volatile__(".byte 0x64\n\tmovl (0),%0"
 164                          "\n\tmovl %0,(%1)"
 165                          "\n\t.byte 0x64\n\tmovl %1,(0)"
 166                          : "=&r" (prev) : "r" (frame) : "memory" );
 167     return prev;
 168 #else
 169     NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
 170     frame->Prev = (void *)teb->ExceptionList;
 171     teb->ExceptionList = (void *)frame;
 172     return frame->Prev;
 173 #endif
 174 }
 175
 176 static inline EXCEPTION_REGISTRATION_RECORD *__wine_pop_frame( EXCEPTION_REGISTRATION_RECORD *frame )
 177 {
 178 #if defined(__GNUC__) && defined(__i386__)
 179     __asm__ __volatile__(".byte 0x64\n\tmovl %0,(0)"
 180                          : : "r" (frame->prev) : "memory" );
 181     return frame->prev;
 182
 183 #else
 184     NT_TIB *teb = (NT_TIB *)NtCurrentTeb();
 185     teb->ExceptionList = (void *)frame->Prev;
 186     return frame->Prev;
 187 #endif
 188 }
 189
 190
 191 /* Wine-specific exceptions codes */
 192
 193 #define EXCEPTION_WINE_STUB       0x80000100  /* stub entry point called */
 194 #define EXCEPTION_WINE_ASSERTION  0x80000101  /* assertion failed */
 195
 196 /* unhandled return status from vm86 mode */
 197 #define EXCEPTION_VM86_INTx       0x80000110
 198 #define EXCEPTION_VM86_STI        0x80000111
 199 #define EXCEPTION_VM86_PICRETURN  0x80000112
 200
 201 extern void __wine_enter_vm86( CONTEXT *context );
 202
 203 #endif  /* __WINE_WINE_EXCEPTION_H */