Added macros and definitions for using exception inside Wine or

dlls/ntdll/exception.c

@@ -8,7 +8,7 @@
 #include "debugtools.h"
 #include "winnt.h"
 #include "ntddk.h"
-#include "except.h"
+#include "wine/exception.h"
 #include "stackframe.h"
 
 DEFAULT_DEBUG_CHANNEL(seh)
@@ -248,7 +248,7 @@ REGS_ENTRYPOINT(NtRaiseException)
     first = (BOOL)STACK32_POP(context);
     STACK32_PUSH(context,ret);  /* restore return addr */
 
-    EXC_RaiseException( rec, context );
+    EXC_RaiseException( rec, ctx );
     *context = *ctx;
 }
 
@@ -276,9 +276,6 @@ REGS_ENTRYPOINT(RtlRaiseException)
 /*******************************************************************
  *         RtlUnwind  (KERNEL32.590) (NTDLL.518)
  *
- *  This function is undocumented. This is the general idea of 
- *  RtlUnwind, though. Note that error handling is not yet implemented.
- *
  * The real prototype is:
  * void WINAPI RtlUnwind( PEXCEPTION_FRAME pEndFrame, LPVOID unusedEip, 
  *                        PEXCEPTION_RECORD pRecord, DWORD returnEax );

if1632/thunk.c

@@ -19,7 +19,6 @@
 #include "selectors.h"
 #include "syslevel.h"
 #include "task.h"
-#include "except.h"
 #include "win.h"
 #include "flatthunk.h"
 #include "mouse.h"

include/except.h

-/*
- * except.h
- * Copyright (c) 1996 Onno Hovers (onno@stack.urc.tue.nl)
- * Copyright (c) 1999 Alexandre Julliard
- */
-
-#ifndef __WINE_EXCEPT_H
-#define __WINE_EXCEPT_H
-
-#include <setjmp.h>
-#include "winnt.h"
-#include "thread.h"
-
-                        
-static inline EXCEPTION_FRAME *EXC_push_frame( EXCEPTION_FRAME *frame )
-{
-    TEB * teb = NtCurrentTeb();
-    frame->Prev = teb->except;
-    teb->except = frame;
-    return frame;
-}
-
-static inline EXCEPTION_FRAME *EXC_pop_frame( EXCEPTION_FRAME *frame )
-{
-    NtCurrentTeb()->except = frame->Prev;
-    return frame->Prev;
-}
-
-#endif  /* __WINE_EXCEPT_H */

include/wine/exception.h

+/*
+ * Wine exception handling
+ *
+ * Copyright (c) 1999 Alexandre Julliard
+ */
+
+#ifndef __WINE_WINE_EXCEPTION_H
+#define __WINE_WINE_EXCEPTION_H
+
+#include <setjmp.h>
+#include "winnt.h"
+#include "thread.h"
+
+/* 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,param)
+ * {
+ *     handle the exception here
+ * }
+ * __ENDTRY()
+ *
+ * or
+ *
+ * __TRY()
+ * {
+ *     do some stuff that can raise an exception
+ * }
+ * __FINALLY(finally_func,param)
+ *
+ * The filter_func must be defined with the WINE_EXCEPTION_FILTER
+ * macro, and return one of the EXCEPTION_* code; it can use
+ * GetExceptionInformation and GetExceptionCode to retrieve the
+ * exception info.
+ *
+ * The finally_func must be defined with the WINE_FINALLY_FUNC macro.
+ *
+ * Warning: you cannot use return, break, or continue inside a __TRY
+ * or __EXCEPT block.
+ *
+ * -- AJ
+ */
+
+#define __TRY() \
+    do { __WINE_FRAME __f; int __state = -1; \
+         while (__state != 2) switch(__state) \
+         { case 0: /* try */
+
+#define __EXCEPT(func,arg) \
+                __state = 2; break; \
+           case -1:  /* init */ \
+                __f.frame.Handler = (PEXCEPTION_HANDLER)WINE_exception_handler; \
+                __f.u.e.filter = (func); \
+                __f.u.e.param = (LPVOID)(arg); \
+                EXC_push_frame( &__f.frame ); \
+                __state = setjmp( __f.u.e.jmp); \
+                break; \
+            case 1:  /* except */
+
+#define __ENDTRY() \
+                __state++; break; \
+            } \
+        EXC_pop_frame( &__f.frame ); \
+    } while (0);
+
+#define __FINALLY(func,arg) \
+                __state = 2; break; \
+           case -1:  /* init */ \
+                __f.frame.Handler = (PEXCEPTION_HANDLER)WINE_finally_handler; \
+                __f.u.f.finally_func = (func); \
+                __f.u.f.param = (LPVOID)(arg); \
+                EXC_push_frame( &__f.frame ); \
+                __ENDTRY()
+
+#define WINE_EXCEPTION_FILTER(func,arg) DWORD WINAPI func( EXCEPTION_POINTERS *__eptr, LPVOID arg )
+#define WINE_FINALLY_FUNC(func,arg) void WINAPI func( LPVOID arg )
+
+#define GetExceptionInformation() (__eptr)
+#define GetExceptionCode()        (__eptr->ExceptionRecord->ExceptionCode)
+
+
+typedef DWORD (*CALLBACK __WINE_FILTER)(PEXCEPTION_POINTERS,LPVOID);
+typedef void (*CALLBACK __WINE_FINALLY)(LPVOID);
+
+typedef struct
+{
+    EXCEPTION_FRAME frame;
+    union
+    {
+        struct  /* exception data */
+        {
+            __WINE_FILTER   filter;
+            LPVOID          param;
+            jmp_buf         jmp;
+        } e;
+        struct  /* finally data */
+        {
+            __WINE_FINALLY  finally_func;
+            LPVOID          param;
+        } f;
+    } u;
+} __WINE_FRAME;
+
+extern DWORD WINAPI WINE_exception_handler( PEXCEPTION_RECORD record, EXCEPTION_FRAME *frame,
+                                            CONTEXT *context, LPVOID pdispatcher );
+extern DWORD WINAPI WINE_finally_handler( PEXCEPTION_RECORD record, EXCEPTION_FRAME *frame,
+                                          CONTEXT *context, LPVOID pdispatcher );
+
+static inline EXCEPTION_FRAME *EXC_push_frame( EXCEPTION_FRAME *frame )
+{
+    TEB * teb = NtCurrentTeb();
+    frame->Prev = teb->except;
+    teb->except = frame;
+    return frame;
+}
+
+static inline EXCEPTION_FRAME *EXC_pop_frame( EXCEPTION_FRAME *frame )
+{
+    NtCurrentTeb()->except = frame->Prev;
+    return frame->Prev;
+}
+
+#endif  /* __WINE_WINE_EXCEPTION_H */

win32/except.c

@@ -20,27 +20,18 @@
  *  But exception handling is so basic to Win32 that it should be 
  *  documented!
  *
- * Fixmes:
- *  -Most functions need better parameter checking.
- *  -I do not know how to handle exceptions within an exception handler.
- *   or what is done when ExceptionNestedException is returned from an 
- *   exception handler
- *  -Real exceptions are not yet implemented. only the exception functions
- *   are implemented. A real implementation needs some new code in
- *   loader/signal.c. There would also be a need for showing debugging
- *   information in UnhandledExceptionFilter.
- *
  */
 
 #include <assert.h>
 #include "winuser.h"
 #include "winerror.h"
+#include "ntddk.h"
+#include "wine/exception.h"
 #include "ldt.h"
 #include "process.h"
 #include "thread.h"
-#include "debugtools.h"
-#include "except.h"
 #include "stackframe.h"
+#include "debugtools.h"
 
 DEFAULT_DEBUG_CHANNEL(seh)
 
@@ -107,3 +98,55 @@ LPTOP_LEVEL_EXCEPTION_FILTER WINAPI SetUnhandledExceptionFilter(
     pdb->top_filter = filter;
     return old;
 }
+
+
+/*************************************************************
+ *            WINE_exception_handler
+ *
+ * Exception handler for exception blocks declared in Wine code.
+ */
+DWORD WINAPI WINE_exception_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
+                                     CONTEXT *context, LPVOID pdispatcher )
+{
+    __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
+
+    if (record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
+        return ExceptionContinueSearch;
+    if (wine_frame->u.e.filter)
+    {
+        EXCEPTION_POINTERS ptrs;
+        ptrs.ExceptionRecord = record;
+        ptrs.ContextRecord = context;
+        switch(wine_frame->u.e.filter( &ptrs, wine_frame->u.e.param ))
+        {
+        case EXCEPTION_CONTINUE_SEARCH:
+            return ExceptionContinueSearch;
+        case EXCEPTION_CONTINUE_EXECUTION:
+            return ExceptionContinueExecution;
+        case EXCEPTION_EXECUTE_HANDLER:
+            break;
+        default:
+            /* FIXME: should probably raise a nested exception here */
+            return ExceptionContinueSearch;
+        }
+    }
+    RtlUnwind( frame, 0, record, 0 );
+    longjmp( wine_frame->u.e.jmp, 1 );
+}
+
+
+/*************************************************************
+ *            WINE_finally_handler
+ *
+ * Exception handler for try/finally blocks declared in Wine code.
+ */
+DWORD WINAPI WINE_finally_handler( EXCEPTION_RECORD *record, EXCEPTION_FRAME *frame,
+                                   CONTEXT *context, LPVOID pdispatcher )
+{
+    __WINE_FRAME *wine_frame = (__WINE_FRAME *)frame;
+
+    if (!(record->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND)))
+        return ExceptionContinueSearch;
+    wine_frame->u.f.finally_func( wine_frame->u.f.param );
+    return ExceptionContinueSearch;
+}