ddraw/tests: Fix test failure for D3DFMT_A2R10G10B10 pixel format in GetDC tests.
[wine] / dlls / msvcrt / cppexcept.c
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1/*
2 * msvcrt C++ exception handling
3 *
4 * Copyright 2002 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
360a3f91 18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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19 *
20 * NOTES
21 * A good reference is the article "How a C++ compiler implements
22 * exception handling" by Vishal Kochhar, available on
23 * www.thecodeproject.com.
24 */
25
26#include "config.h"
27#include "wine/port.h"
28
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29#include <stdarg.h>
30
31#include "windef.h"
32#include "winbase.h"
9c1de6de 33#include "winternl.h"
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34#include "msvcrt.h"
35#include "wine/exception.h"
737d4be8 36#include "excpt.h"
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37#include "wine/debug.h"
38
c62c1c01 39#include "cppexcept.h"
37a4c9b8 40
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41#ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */
42
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43WINE_DEFAULT_DEBUG_CHANNEL(seh);
44
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45DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
46 PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
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47 const cxx_function_descr *descr,
48 EXCEPTION_REGISTRATION_RECORD* nested_frame, int nested_trylevel );
5ad69f19 49
37a4c9b8 50/* call a function with a given ebp */
7b103480 51static inline void *call_ebp_func( void *func, void *ebp )
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52{
53 void *ret;
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54 int dummy;
55 __asm__ __volatile__ ("pushl %%ebx\n\t"
56 "pushl %%ebp\n\t"
57 "movl %4,%%ebp\n\t"
58 "call *%%eax\n\t"
59 "popl %%ebp\n\t"
60 "popl %%ebx"
61 : "=a" (ret), "=S" (dummy), "=D" (dummy)
62 : "0" (func), "1" (ebp) : "ecx", "edx", "memory" );
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63 return ret;
64}
65
66/* call a copy constructor */
7b103480 67static inline void call_copy_ctor( void *func, void *this, void *src, int has_vbase )
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68{
69 TRACE( "calling copy ctor %p object %p src %p\n", func, this, src );
70 if (has_vbase)
71 /* in that case copy ctor takes an extra bool indicating whether to copy the base class */
72 __asm__ __volatile__("pushl $1; pushl %2; call *%0"
505dfdef 73 : : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
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74 else
75 __asm__ __volatile__("pushl %2; call *%0"
505dfdef 76 : : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
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77}
78
79/* call the destructor of the exception object */
7b103480 80static inline void call_dtor( void *func, void *object )
37a4c9b8 81{
6bd508f8 82 __asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" );
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83}
84
abb170fa 85/* continue execution to the specified address after exception is caught */
7b103480 86static inline void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr )
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87{
88 __asm__ __volatile__("movl -4(%0),%%esp; leal 12(%0),%%ebp; jmp *%1"
89 : : "r" (frame), "a" (addr) );
90 for (;;) ; /* unreached */
91}
92
b8d5d962 93static inline void dump_type( const cxx_type_info *type )
37a4c9b8 94{
9f859692 95 TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n",
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96 type->flags, type->type_info, dbgstr_type_info(type->type_info),
97 type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset,
98 type->size, type->copy_ctor );
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99}
100
c62c1c01 101static void dump_exception_type( const cxx_exception_type *type )
37a4c9b8 102{
c62c1c01 103 UINT i;
37a4c9b8 104
9f859692 105 TRACE( "flags %x destr %p handler %p type info %p\n",
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106 type->flags, type->destructor, type->custom_handler, type->type_info_table );
107 for (i = 0; i < type->type_info_table->count; i++)
108 {
9f859692 109 TRACE( " %d: ", i );
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110 dump_type( type->type_info_table->info[i] );
111 }
112}
113
8592c4b8 114static void dump_function_descr( const cxx_function_descr *descr )
37a4c9b8 115{
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116 UINT i;
117 int j;
37a4c9b8 118
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119 TRACE( "magic %x\n", descr->magic );
120 TRACE( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count );
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121 for (i = 0; i < descr->unwind_count; i++)
122 {
9f859692 123 TRACE( " %d: prev %d func %p\n", i,
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124 descr->unwind_table[i].prev, descr->unwind_table[i].handler );
125 }
9f859692 126 TRACE( "try table: %p %d\n", descr->tryblock, descr->tryblock_count );
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127 for (i = 0; i < descr->tryblock_count; i++)
128 {
9f859692 129 TRACE( " %d: start %d end %d catchlevel %d catch %p %d\n", i,
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130 descr->tryblock[i].start_level, descr->tryblock[i].end_level,
131 descr->tryblock[i].catch_level, descr->tryblock[i].catchblock,
132 descr->tryblock[i].catchblock_count );
133 for (j = 0; j < descr->tryblock[i].catchblock_count; j++)
134 {
8592c4b8 135 const catchblock_info *ptr = &descr->tryblock[i].catchblock[j];
9f859692 136 TRACE( " %d: flags %x offset %d handler %p type %p %s\n",
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137 j, ptr->flags, ptr->offset, ptr->handler,
138 ptr->type_info, dbgstr_type_info( ptr->type_info ) );
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139 }
140 }
141}
142
37a4c9b8 143/* check if the exception type is caught by a given catch block, and return the type that matched */
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144static const cxx_type_info *find_caught_type( cxx_exception_type *exc_type,
145 const catchblock_info *catchblock )
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146{
147 UINT i;
148
149 for (i = 0; i < exc_type->type_info_table->count; i++)
150 {
c62c1c01 151 const cxx_type_info *type = exc_type->type_info_table->info[i];
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152
153 if (!catchblock->type_info) return type; /* catch(...) matches any type */
154 if (catchblock->type_info != type->type_info)
155 {
c62c1c01 156 if (strcmp( catchblock->type_info->mangled, type->type_info->mangled )) continue;
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157 }
158 /* type is the same, now check the flags */
159 if ((exc_type->flags & TYPE_FLAG_CONST) &&
160 !(catchblock->flags & TYPE_FLAG_CONST)) continue;
161 if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
162 !(catchblock->flags & TYPE_FLAG_VOLATILE)) continue;
163 return type; /* it matched */
164 }
165 return NULL;
166}
167
168
169/* copy the exception object where the catch block wants it */
170static void copy_exception( void *object, cxx_exception_frame *frame,
8592c4b8 171 const catchblock_info *catchblock, const cxx_type_info *type )
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172{
173 void **dest_ptr;
174
c62c1c01 175 if (!catchblock->type_info || !catchblock->type_info->mangled[0]) return;
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176 if (!catchblock->offset) return;
177 dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset);
178
179 if (catchblock->flags & TYPE_FLAG_REFERENCE)
180 {
b8d5d962 181 *dest_ptr = get_this_pointer( &type->offsets, object );
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182 }
183 else if (type->flags & CLASS_IS_SIMPLE_TYPE)
184 {
185 memmove( dest_ptr, object, type->size );
186 /* if it is a pointer, adjust it */
b8d5d962 187 if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( &type->offsets, *dest_ptr );
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188 }
189 else /* copy the object */
190 {
191 if (type->copy_ctor)
b8d5d962 192 call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(&type->offsets,object),
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193 (type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) );
194 else
b8d5d962 195 memmove( dest_ptr, get_this_pointer(&type->offsets,object), type->size );
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196 }
197}
198
199/* unwind the local function up to a given trylevel */
8592c4b8 200static void cxx_local_unwind( cxx_exception_frame* frame, const cxx_function_descr *descr, int last_level)
37a4c9b8 201{
5af33ee0 202 void (*handler)(void);
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203 int trylevel = frame->trylevel;
204
205 while (trylevel != last_level)
206 {
207 if (trylevel < 0 || trylevel >= descr->unwind_count)
208 {
209 ERR( "invalid trylevel %d\n", trylevel );
210 MSVCRT_terminate();
211 }
212 handler = descr->unwind_table[trylevel].handler;
213 if (handler)
214 {
215 TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n",
216 handler, trylevel, last_level, &frame->ebp );
217 call_ebp_func( handler, &frame->ebp );
218 }
219 trylevel = descr->unwind_table[trylevel].prev;
220 }
221 frame->trylevel = last_level;
222}
223
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224/* exception frame for nested exceptions in catch block */
225struct catch_func_nested_frame
226{
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227 EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */
228 EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
229 cxx_exception_frame *cxx_frame; /* frame of parent exception */
8592c4b8 230 const cxx_function_descr *descr; /* descriptor of parent exception */
ee106783 231 int trylevel; /* current try level */
be07b6db 232 EXCEPTION_RECORD *rec; /* rec associated with frame */
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233};
234
235/* handler for exceptions happening while calling a catch function */
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236static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
237 CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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238{
239 struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame;
240
241 if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
242 {
243 msvcrt_get_thread_data()->exc_record = nested_frame->prev_rec;
244 return ExceptionContinueSearch;
245 }
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246
247 TRACE( "got nested exception in catch function\n" );
248
249 if(rec->ExceptionCode == CXX_EXCEPTION)
5ad69f19 250 {
be07b6db 251 PEXCEPTION_RECORD prev_rec = nested_frame->rec;
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252 if(rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0)
253 {
254 /* exception was rethrown */
255 rec->ExceptionInformation[1] = prev_rec->ExceptionInformation[1];
256 rec->ExceptionInformation[2] = prev_rec->ExceptionInformation[2];
257 TRACE("detect rethrow: re-propagate: obj: %lx, type: %lx\n",
258 rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
259 }
260 else {
261 /* new exception in exception handler, destroy old */
262 void *object = (void*)prev_rec->ExceptionInformation[1];
263 cxx_exception_type *info = (cxx_exception_type*) prev_rec->ExceptionInformation[2];
264 TRACE("detect threw new exception in catch block - destroy old(obj: %p type: %p)\n",
265 object, info);
266 if(info && info->destructor)
267 call_dtor( info->destructor, object );
268 }
5ad69f19 269 }
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270
271 return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
272 NULL, nested_frame->descr, &nested_frame->frame,
273 nested_frame->trylevel );
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274}
275
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276/* find and call the appropriate catch block for an exception */
277/* returns the address to continue execution to after the catch block was called */
7b103480 278static inline void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
8592c4b8 279 const cxx_function_descr *descr, int nested_trylevel,
abb170fa 280 cxx_exception_type *info )
37a4c9b8 281{
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282 UINT i;
283 int j;
916c4b6b 284 void *addr, *object = (void *)rec->ExceptionInformation[1];
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285 struct catch_func_nested_frame nested_frame;
286 int trylevel = frame->trylevel;
03774624 287 thread_data_t *thread_data = msvcrt_get_thread_data();
82818284 288 DWORD save_esp = ((DWORD*)frame)[-1];
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289
290 for (i = 0; i < descr->tryblock_count; i++)
291 {
8592c4b8 292 const tryblock_info *tryblock = &descr->tryblock[i];
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293
294 if (trylevel < tryblock->start_level) continue;
295 if (trylevel > tryblock->end_level) continue;
296
297 /* got a try block */
298 for (j = 0; j < tryblock->catchblock_count; j++)
299 {
8592c4b8 300 const catchblock_info *catchblock = &tryblock->catchblock[j];
78ea87c5
PB
301 if(info)
302 {
303 const cxx_type_info *type = find_caught_type( info, catchblock );
304 if (!type) continue;
305
306 TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j );
307
308 /* copy the exception to its destination on the stack */
309 copy_exception( object, frame, catchblock, type );
310 }
311 else
312 {
313 /* no CXX_EXCEPTION only proceed with a catch(...) block*/
314 if(catchblock->type_info)
315 continue;
316 TRACE("found catch(...) block\n");
317 }
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318
319 /* unwind the stack */
5ad69f19 320 RtlUnwind( frame, 0, rec, 0 );
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321 cxx_local_unwind( frame, descr, tryblock->start_level );
322 frame->trylevel = tryblock->end_level + 1;
323
324 /* call the catch block */
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325 TRACE( "calling catch block %p addr %p ebp %p\n",
326 catchblock, catchblock->handler, &frame->ebp );
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327
328 /* setup an exception block for nested exceptions */
329
330 nested_frame.frame.Handler = catch_function_nested_handler;
331 nested_frame.prev_rec = thread_data->exc_record;
332 nested_frame.cxx_frame = frame;
333 nested_frame.descr = descr;
334 nested_frame.trylevel = nested_trylevel + 1;
be07b6db 335 nested_frame.rec = rec;
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336
337 __wine_push_frame( &nested_frame.frame );
338 thread_data->exc_record = rec;
37a4c9b8 339 addr = call_ebp_func( catchblock->handler, &frame->ebp );
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340 thread_data->exc_record = nested_frame.prev_rec;
341 __wine_pop_frame( &nested_frame.frame );
342
82818284 343 ((DWORD*)frame)[-1] = save_esp;
78ea87c5 344 if (info && info->destructor) call_dtor( info->destructor, object );
37a4c9b8 345 TRACE( "done, continuing at %p\n", addr );
916c4b6b 346
abb170fa 347 continue_after_catch( frame, addr );
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348 }
349 }
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350}
351
352
353/*********************************************************************
354 * cxx_frame_handler
355 *
356 * Implementation of __CxxFrameHandler.
357 */
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358DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
359 PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
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360 const cxx_function_descr *descr,
361 EXCEPTION_REGISTRATION_RECORD* nested_frame,
24beabfd 362 int nested_trylevel )
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363{
364 cxx_exception_type *exc_type;
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365
366 if (descr->magic != CXX_FRAME_MAGIC)
367 {
368 ERR( "invalid frame magic %x\n", descr->magic );
369 return ExceptionContinueSearch;
370 }
371 if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
372 {
5ad69f19 373 if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
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374 return ExceptionContinueSearch;
375 }
376 if (!descr->tryblock_count) return ExceptionContinueSearch;
377
78ea87c5 378 if(rec->ExceptionCode == CXX_EXCEPTION)
5ad69f19 379 {
5ad69f19 380 exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
37a4c9b8 381
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PB
382 if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC &&
383 exc_type->custom_handler)
384 {
abb170fa 385 return exc_type->custom_handler( rec, frame, context, dispatch,
78ea87c5
PB
386 descr, nested_trylevel, nested_frame, 0 );
387 }
62dc7f52 388
78ea87c5
PB
389 if (TRACE_ON(seh))
390 {
391 TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n",
392 rec, frame, frame->trylevel, descr, nested_frame );
393 dump_exception_type( exc_type );
8592c4b8 394 dump_function_descr( descr );
78ea87c5
PB
395 }
396 }
397 else
37a4c9b8 398 {
78ea87c5 399 exc_type = NULL;
6520ee04 400 TRACE("handling C exception code %x rec %p frame %p trylevel %d descr %p nested_frame %p\n",
78ea87c5 401 rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame );
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402 }
403
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404 call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
405 return ExceptionContinueSearch;
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406}
407
408
409/*********************************************************************
410 * __CxxFrameHandler (MSVCRT.@)
411 */
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412extern DWORD CDECL __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame,
413 PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch );
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414__ASM_GLOBAL_FUNC( __CxxFrameHandler,
415 "pushl $0\n\t" /* nested_trylevel */
0cb406ef 416 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 417 "pushl $0\n\t" /* nested_frame */
0cb406ef 418 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 419 "pushl %eax\n\t" /* descr */
0cb406ef 420 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 421 "pushl 28(%esp)\n\t" /* dispatch */
0cb406ef 422 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 423 "pushl 28(%esp)\n\t" /* context */
0cb406ef 424 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 425 "pushl 28(%esp)\n\t" /* frame */
0cb406ef 426 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa 427 "pushl 28(%esp)\n\t" /* rec */
0cb406ef 428 __ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
abb170fa
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429 "call " __ASM_NAME("cxx_frame_handler") "\n\t"
430 "add $28,%esp\n\t"
0cb406ef 431 __ASM_CFI(".cfi_adjust_cfa_offset -28\n\t")
2319999a 432 "ret" )
37a4c9b8 433
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434
435/*********************************************************************
436 * __CxxLongjmpUnwind (MSVCRT.@)
437 *
438 * Callback meant to be used as UnwindFunc for setjmp/longjmp.
439 */
440void __stdcall __CxxLongjmpUnwind( const struct MSVCRT___JUMP_BUFFER *buf )
441{
442 cxx_exception_frame *frame = (cxx_exception_frame *)buf->Registration;
443 const cxx_function_descr *descr = (const cxx_function_descr *)buf->UnwindData[0];
444
445 TRACE( "unwinding frame %p descr %p trylevel %ld\n", frame, descr, buf->TryLevel );
446 cxx_local_unwind( frame, descr, buf->TryLevel );
447}
448
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449#endif /* __i386__ */
450
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451
452/*********************************************************************
453 * __CppXcptFilter (MSVCRT.@)
454 */
455int CDECL __CppXcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
456{
457 /* only filter c++ exceptions */
458 if (ex != CXX_EXCEPTION) return EXCEPTION_CONTINUE_SEARCH;
459 return _XcptFilter( ex, ptr );
460}
461
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462/*********************************************************************
463 * _CxxThrowException (MSVCRT.@)
464 */
24beabfd 465void CDECL _CxxThrowException( exception *object, const cxx_exception_type *type )
37a4c9b8 466{
261e3764 467 ULONG_PTR args[3];
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468
469 args[0] = CXX_FRAME_MAGIC;
261e3764
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470 args[1] = (ULONG_PTR)object;
471 args[2] = (ULONG_PTR)type;
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472 RaiseException( CXX_EXCEPTION, EH_NONCONTINUABLE, 3, args );
473}
c62c1c01
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474
475/*********************************************************************
476 * __CxxDetectRethrow (MSVCRT.@)
477 */
24beabfd 478BOOL CDECL __CxxDetectRethrow(PEXCEPTION_POINTERS ptrs)
c62c1c01
JG
479{
480 PEXCEPTION_RECORD rec;
481
482 if (!ptrs)
483 return FALSE;
484
485 rec = ptrs->ExceptionRecord;
486
487 if (rec->ExceptionCode == CXX_EXCEPTION &&
488 rec->NumberParameters == 3 &&
489 rec->ExceptionInformation[0] == CXX_FRAME_MAGIC &&
490 rec->ExceptionInformation[2])
491 {
492 ptrs->ExceptionRecord = msvcrt_get_thread_data()->exc_record;
493 return TRUE;
494 }
495 return (msvcrt_get_thread_data()->exc_record == rec);
496}
497
498/*********************************************************************
499 * __CxxQueryExceptionSize (MSVCRT.@)
500 */
24beabfd 501unsigned int CDECL __CxxQueryExceptionSize(void)
c62c1c01
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502{
503 return sizeof(cxx_exception_type);
504}