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Added support for nested exceptions happening inside a catch block.

This commit is contained in:
Alexandre Julliard 2002-10-31 02:10:15 +00:00
parent 47cc1554d1
commit 5ad69f19bf
2 changed files with 79 additions and 19 deletions
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97
dlls/msvcrt/cppexcept.c
View File

@ -47,8 +47,7 @@ typedef struct __type_info
/* the exception frame used by CxxFrameHandler */
typedef struct __cxx_exception_frame
{
EXCEPTION_FRAME *prev;
void (*handler)(PEXCEPTION_RECORD, PEXCEPTION_FRAME, PCONTEXT, PEXCEPTION_RECORD);
EXCEPTION_FRAME frame; /* the standard exception frame */
int trylevel;
DWORD ebp;
} cxx_exception_frame;
@ -116,8 +115,8 @@ typedef struct __cxx_type_info_table
typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, cxx_exception_frame*,
PCONTEXT, struct __EXCEPTION_FRAME**,
cxx_function_descr*, DWORD unknown1,
DWORD unknown2, DWORD unknown3 );
cxx_function_descr*, int nested_trylevel,
EXCEPTION_FRAME *nested_frame, DWORD unknown3 );
/* type information for an exception object */
typedef struct __cxx_exception_type
@ -131,6 +130,11 @@ typedef struct __cxx_exception_type
#ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */
static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT exc_context, EXCEPTION_FRAME** dispatch,
cxx_function_descr *descr, EXCEPTION_FRAME* nested_frame,
int nested_trylevel, CONTEXT86 *context );
/* call a function with a given ebp */
inline static void *call_ebp_func( void *func, void *ebp )
{
@ -311,15 +315,47 @@ static void cxx_local_unwind( cxx_exception_frame* frame, cxx_function_descr *de
frame->trylevel = last_level;
}
/* exception frame for nested exceptions in catch block */
struct catch_func_nested_frame
{
EXCEPTION_FRAME frame; /* standard exception frame */
EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
cxx_exception_frame *cxx_frame; /* frame of parent exception */
cxx_function_descr *descr; /* descriptor of parent exception */
int trylevel; /* current try level */
};
/* handler for exceptions happening while calling a catch function */
static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_FRAME *frame,
CONTEXT *context, EXCEPTION_FRAME **dispatcher )
{
struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame;
if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
{
msvcrt_get_thread_data()->exc_record = nested_frame->prev_rec;
return ExceptionContinueSearch;
}
else
{
TRACE( "got nested exception in catch function\n" );
return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
NULL, nested_frame->descr, &nested_frame->frame,
nested_frame->trylevel, context );
}
}
/* find and call the appropriate catch block for an exception */
/* returns the address to continue execution to after the catch block was called */
inline static void *call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
EXCEPTION_FRAME *unwind_frame,
cxx_function_descr *descr, int trylevel,
cxx_function_descr *descr, int nested_trylevel,
cxx_exception_type *info )
{
int i, j;
void *addr, *object = (void *)rec->ExceptionInformation[1];
struct catch_func_nested_frame nested_frame;
int trylevel = frame->trylevel;
MSVCRT_thread_data *thread_data = msvcrt_get_thread_data();
for (i = 0; i < descr->tryblock_count; i++)
{
@ -341,14 +377,28 @@ inline static void *call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame
copy_exception( object, frame, catchblock, type );
/* unwind the stack */
RtlUnwind( unwind_frame, 0, rec, 0 );
RtlUnwind( frame, 0, rec, 0 );
cxx_local_unwind( frame, descr, tryblock->start_level );
frame->trylevel = tryblock->end_level + 1;
/* call the catch block */
TRACE( "calling catch block %p for type %p addr %p ebp %p\n",
catchblock, type, catchblock->handler, &frame->ebp );
/* setup an exception block for nested exceptions */
nested_frame.frame.Handler = catch_function_nested_handler;
nested_frame.prev_rec = thread_data->exc_record;
nested_frame.cxx_frame = frame;
nested_frame.descr = descr;
nested_frame.trylevel = nested_trylevel + 1;
__wine_push_frame( &nested_frame.frame );
thread_data->exc_record = rec;
addr = call_ebp_func( catchblock->handler, &frame->ebp );
thread_data->exc_record = nested_frame.prev_rec;
__wine_pop_frame( &nested_frame.frame );
if (info->destructor) call_dtor( info->destructor, object );
TRACE( "done, continuing at %p\n", addr );
return addr;
@ -365,7 +415,8 @@ inline static void *call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame
*/
static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT exc_context, EXCEPTION_FRAME** dispatch,
cxx_function_descr *descr, CONTEXT86 *context )
cxx_function_descr *descr, EXCEPTION_FRAME* nested_frame,
int nested_trylevel, CONTEXT86 *context )
{
cxx_exception_type *exc_type;
void *next_ip;
@ -377,30 +428,38 @@ static DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* fram
}
if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
{
if (descr->unwind_count) cxx_local_unwind( frame, descr, -1 );
if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
return ExceptionContinueSearch;
}
if (!descr->tryblock_count) return ExceptionContinueSearch;
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
if (rec->ExceptionCode != CXX_EXCEPTION) goto normal_handler;
if (rec->ExceptionInformation[0] != CXX_FRAME_MAGIC) goto normal_handler;
if (exc_type->custom_handler)
return exc_type->custom_handler( rec, frame, exc_context, dispatch, descr, 0, 0, 0 );
if (rec->ExceptionCode == CXX_EXCEPTION &&
rec->ExceptionInformation[0] > CXX_FRAME_MAGIC &&
exc_type->custom_handler)
{
return exc_type->custom_handler( rec, frame, exc_context, dispatch,
descr, nested_trylevel, nested_frame, 0 );
}
if (!exc_type) /* nested exception, fetch info from original exception */
{
rec = msvcrt_get_thread_data()->exc_record;
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
}
normal_handler:
if (TRACE_ON(seh))
{
TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p\n",
rec, frame, frame->trylevel, descr );
TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n",
rec, frame, frame->trylevel, descr, nested_frame );
dump_exception_type( exc_type );
dump_function_descr( descr, exc_type );
}
next_ip = call_catch_block( rec, frame, (EXCEPTION_FRAME *)frame,
descr, frame->trylevel, exc_type );
next_ip = call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
if (!next_ip) return ExceptionContinueSearch;
rec->ExceptionFlags &= ~EH_NONCONTINUABLE;
context->Eip = (DWORD)next_ip;
context->Ebp = (DWORD)&frame->ebp;
context->Esp = ((DWORD*)frame)[-1];
@ -417,7 +476,7 @@ void __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_FRAME* frame,
{
cxx_function_descr *descr = (cxx_function_descr *)context->Eax;
context->Eax = cxx_frame_handler( rec, (cxx_exception_frame *)frame,
exc_context, dispatch, descr, context );
exc_context, dispatch, descr, NULL, 0, context );
}
#endif /* __i386__ */

1
dlls/msvcrt/msvcrt.h
View File

@ -40,6 +40,7 @@ typedef struct __MSVCRT_thread_data
terminate_function terminate_handler;
unexpected_function unexpected_handler;
_se_translator_function se_translator;
EXCEPTION_RECORD *exc_record;
} MSVCRT_thread_data;
extern MSVCRT_thread_data *msvcrt_get_thread_data(void);