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470 lines
17 KiB
C
470 lines
17 KiB
C
/*
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* msvcrt C++ exception handling
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*
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* Copyright 2002 Alexandre Julliard
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* NOTES
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* A good reference is the article "How a C++ compiler implements
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* exception handling" by Vishal Kochhar, available on
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* www.thecodeproject.com.
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*/
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#include "config.h"
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#include "wine/port.h"
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#include <stdarg.h>
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#include "windef.h"
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#include "winbase.h"
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#include "winreg.h"
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#include "winternl.h"
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#include "msvcrt.h"
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#include "wine/exception.h"
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#include "excpt.h"
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#include "wine/debug.h"
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#include "cppexcept.h"
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WINE_DEFAULT_DEBUG_CHANNEL(seh);
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#ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */
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DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
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PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
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cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame,
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int nested_trylevel );
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/* call a function with a given ebp */
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inline static void *call_ebp_func( void *func, void *ebp )
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{
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void *ret;
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int dummy;
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__asm__ __volatile__ ("pushl %%ebx\n\t"
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"pushl %%ebp\n\t"
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"movl %4,%%ebp\n\t"
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"call *%%eax\n\t"
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"popl %%ebp\n\t"
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"popl %%ebx"
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: "=a" (ret), "=S" (dummy), "=D" (dummy)
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: "0" (func), "1" (ebp) : "ecx", "edx", "memory" );
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return ret;
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}
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/* call a copy constructor */
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inline static void call_copy_ctor( void *func, void *this, void *src, int has_vbase )
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{
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TRACE( "calling copy ctor %p object %p src %p\n", func, this, src );
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if (has_vbase)
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/* in that case copy ctor takes an extra bool indicating whether to copy the base class */
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__asm__ __volatile__("pushl $1; pushl %2; call *%0"
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: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
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else
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__asm__ __volatile__("pushl %2; call *%0"
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: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
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}
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/* call the destructor of the exception object */
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inline static void call_dtor( void *func, void *object )
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{
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__asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" );
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}
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/* continue execution to the specified address after exception is caught */
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inline static void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr )
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{
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__asm__ __volatile__("movl -4(%0),%%esp; leal 12(%0),%%ebp; jmp *%1"
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: : "r" (frame), "a" (addr) );
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for (;;) ; /* unreached */
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}
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static inline void dump_type( const cxx_type_info *type )
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{
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TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n",
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type->flags, type->type_info, dbgstr_type_info(type->type_info),
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type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset,
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type->size, type->copy_ctor );
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}
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static void dump_exception_type( const cxx_exception_type *type )
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{
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UINT i;
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TRACE( "flags %x destr %p handler %p type info %p\n",
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type->flags, type->destructor, type->custom_handler, type->type_info_table );
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for (i = 0; i < type->type_info_table->count; i++)
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{
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TRACE( " %d: ", i );
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dump_type( type->type_info_table->info[i] );
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}
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}
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static void dump_function_descr( const cxx_function_descr *descr, const cxx_exception_type *info )
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{
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UINT i;
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int j;
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TRACE( "magic %x\n", descr->magic );
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TRACE( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count );
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for (i = 0; i < descr->unwind_count; i++)
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{
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TRACE( " %d: prev %d func %p\n", i,
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descr->unwind_table[i].prev, descr->unwind_table[i].handler );
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}
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TRACE( "try table: %p %d\n", descr->tryblock, descr->tryblock_count );
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for (i = 0; i < descr->tryblock_count; i++)
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{
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TRACE( " %d: start %d end %d catchlevel %d catch %p %d\n", i,
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descr->tryblock[i].start_level, descr->tryblock[i].end_level,
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descr->tryblock[i].catch_level, descr->tryblock[i].catchblock,
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descr->tryblock[i].catchblock_count );
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for (j = 0; j < descr->tryblock[i].catchblock_count; j++)
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{
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catchblock_info *ptr = &descr->tryblock[i].catchblock[j];
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TRACE( " %d: flags %x offset %d handler %p type %p %s\n",
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j, ptr->flags, ptr->offset, ptr->handler,
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ptr->type_info, dbgstr_type_info( ptr->type_info ) );
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}
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}
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}
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/* check if the exception type is caught by a given catch block, and return the type that matched */
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static const cxx_type_info *find_caught_type( cxx_exception_type *exc_type, catchblock_info *catchblock )
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{
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UINT i;
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for (i = 0; i < exc_type->type_info_table->count; i++)
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{
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const cxx_type_info *type = exc_type->type_info_table->info[i];
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if (!catchblock->type_info) return type; /* catch(...) matches any type */
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if (catchblock->type_info != type->type_info)
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{
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if (strcmp( catchblock->type_info->mangled, type->type_info->mangled )) continue;
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}
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/* type is the same, now check the flags */
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if ((exc_type->flags & TYPE_FLAG_CONST) &&
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!(catchblock->flags & TYPE_FLAG_CONST)) continue;
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if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
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!(catchblock->flags & TYPE_FLAG_VOLATILE)) continue;
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return type; /* it matched */
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}
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return NULL;
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}
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/* copy the exception object where the catch block wants it */
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static void copy_exception( void *object, cxx_exception_frame *frame,
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catchblock_info *catchblock, const cxx_type_info *type )
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{
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void **dest_ptr;
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if (!catchblock->type_info || !catchblock->type_info->mangled[0]) return;
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if (!catchblock->offset) return;
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dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset);
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if (catchblock->flags & TYPE_FLAG_REFERENCE)
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{
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*dest_ptr = get_this_pointer( &type->offsets, object );
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}
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else if (type->flags & CLASS_IS_SIMPLE_TYPE)
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{
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memmove( dest_ptr, object, type->size );
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/* if it is a pointer, adjust it */
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if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( &type->offsets, *dest_ptr );
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}
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else /* copy the object */
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{
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if (type->copy_ctor)
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call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(&type->offsets,object),
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(type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) );
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else
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memmove( dest_ptr, get_this_pointer(&type->offsets,object), type->size );
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}
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}
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/* unwind the local function up to a given trylevel */
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static void cxx_local_unwind( cxx_exception_frame* frame, cxx_function_descr *descr, int last_level)
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{
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void (*handler)();
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int trylevel = frame->trylevel;
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while (trylevel != last_level)
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{
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if (trylevel < 0 || trylevel >= descr->unwind_count)
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{
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ERR( "invalid trylevel %d\n", trylevel );
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MSVCRT_terminate();
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}
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handler = descr->unwind_table[trylevel].handler;
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if (handler)
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{
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TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n",
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handler, trylevel, last_level, &frame->ebp );
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call_ebp_func( handler, &frame->ebp );
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}
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trylevel = descr->unwind_table[trylevel].prev;
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}
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frame->trylevel = last_level;
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}
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/* exception frame for nested exceptions in catch block */
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struct catch_func_nested_frame
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{
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EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */
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EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
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cxx_exception_frame *cxx_frame; /* frame of parent exception */
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cxx_function_descr *descr; /* descriptor of parent exception */
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int trylevel; /* current try level */
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EXCEPTION_RECORD *rec; /* rec associated with frame */
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};
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/* handler for exceptions happening while calling a catch function */
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static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
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CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **dispatcher )
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{
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struct catch_func_nested_frame *nested_frame = (struct catch_func_nested_frame *)frame;
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if (rec->ExceptionFlags & (EH_UNWINDING | EH_EXIT_UNWIND))
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{
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msvcrt_get_thread_data()->exc_record = nested_frame->prev_rec;
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return ExceptionContinueSearch;
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}
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TRACE( "got nested exception in catch function\n" );
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if(rec->ExceptionCode == CXX_EXCEPTION)
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{
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PEXCEPTION_RECORD prev_rec = nested_frame->rec;
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if(rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0)
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{
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/* exception was rethrown */
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rec->ExceptionInformation[1] = prev_rec->ExceptionInformation[1];
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rec->ExceptionInformation[2] = prev_rec->ExceptionInformation[2];
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TRACE("detect rethrow: re-propagate: obj: %lx, type: %lx\n",
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rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
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}
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else {
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/* new exception in exception handler, destroy old */
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void *object = (void*)prev_rec->ExceptionInformation[1];
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cxx_exception_type *info = (cxx_exception_type*) prev_rec->ExceptionInformation[2];
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TRACE("detect threw new exception in catch block - destroy old(obj: %p type: %p)\n",
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object, info);
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if(info && info->destructor)
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call_dtor( info->destructor, object );
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}
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}
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return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
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NULL, nested_frame->descr, &nested_frame->frame,
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nested_frame->trylevel );
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}
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/* find and call the appropriate catch block for an exception */
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/* returns the address to continue execution to after the catch block was called */
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inline static void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
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cxx_function_descr *descr, int nested_trylevel,
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cxx_exception_type *info )
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{
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UINT i;
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int j;
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void *addr, *object = (void *)rec->ExceptionInformation[1];
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struct catch_func_nested_frame nested_frame;
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int trylevel = frame->trylevel;
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thread_data_t *thread_data = msvcrt_get_thread_data();
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DWORD save_esp = ((DWORD*)frame)[-1];
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for (i = 0; i < descr->tryblock_count; i++)
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{
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tryblock_info *tryblock = &descr->tryblock[i];
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if (trylevel < tryblock->start_level) continue;
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if (trylevel > tryblock->end_level) continue;
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/* got a try block */
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for (j = 0; j < tryblock->catchblock_count; j++)
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{
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catchblock_info *catchblock = &tryblock->catchblock[j];
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if(info)
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{
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const cxx_type_info *type = find_caught_type( info, catchblock );
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if (!type) continue;
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TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j );
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/* copy the exception to its destination on the stack */
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copy_exception( object, frame, catchblock, type );
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}
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else
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{
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/* no CXX_EXCEPTION only proceed with a catch(...) block*/
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if(catchblock->type_info)
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continue;
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TRACE("found catch(...) block\n");
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}
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/* unwind the stack */
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RtlUnwind( frame, 0, rec, 0 );
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cxx_local_unwind( frame, descr, tryblock->start_level );
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frame->trylevel = tryblock->end_level + 1;
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/* call the catch block */
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TRACE( "calling catch block %p addr %p ebp %p\n",
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catchblock, catchblock->handler, &frame->ebp );
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/* setup an exception block for nested exceptions */
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nested_frame.frame.Handler = catch_function_nested_handler;
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nested_frame.prev_rec = thread_data->exc_record;
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nested_frame.cxx_frame = frame;
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nested_frame.descr = descr;
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nested_frame.trylevel = nested_trylevel + 1;
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nested_frame.rec = rec;
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__wine_push_frame( &nested_frame.frame );
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thread_data->exc_record = rec;
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addr = call_ebp_func( catchblock->handler, &frame->ebp );
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thread_data->exc_record = nested_frame.prev_rec;
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__wine_pop_frame( &nested_frame.frame );
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((DWORD*)frame)[-1] = save_esp;
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if (info && info->destructor) call_dtor( info->destructor, object );
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TRACE( "done, continuing at %p\n", addr );
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continue_after_catch( frame, addr );
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}
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}
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}
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/*********************************************************************
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* cxx_frame_handler
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*
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* Implementation of __CxxFrameHandler.
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*/
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DWORD cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
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PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
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cxx_function_descr *descr, EXCEPTION_REGISTRATION_RECORD* nested_frame,
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int nested_trylevel )
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{
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cxx_exception_type *exc_type;
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if (descr->magic != CXX_FRAME_MAGIC)
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{
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ERR( "invalid frame magic %x\n", descr->magic );
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return ExceptionContinueSearch;
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}
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if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
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{
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if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
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return ExceptionContinueSearch;
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}
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if (!descr->tryblock_count) return ExceptionContinueSearch;
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if(rec->ExceptionCode == CXX_EXCEPTION)
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{
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exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
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if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC &&
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exc_type->custom_handler)
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{
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return exc_type->custom_handler( rec, frame, context, dispatch,
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descr, nested_trylevel, nested_frame, 0 );
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}
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if (TRACE_ON(seh))
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{
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TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p nested_frame %p\n",
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rec, frame, frame->trylevel, descr, nested_frame );
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dump_exception_type( exc_type );
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dump_function_descr( descr, exc_type );
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}
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}
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else
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{
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exc_type = NULL;
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TRACE("handling C exception code %lx rec %p frame %p trylevel %d descr %p nested_frame %p\n",
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rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame );
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}
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call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
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return ExceptionContinueSearch;
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}
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/*********************************************************************
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* __CxxFrameHandler (MSVCRT.@)
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*/
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extern DWORD __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame,
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PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch );
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__ASM_GLOBAL_FUNC( __CxxFrameHandler,
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"pushl $0\n\t" /* nested_trylevel */
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"pushl $0\n\t" /* nested_frame */
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"pushl %eax\n\t" /* descr */
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"pushl 28(%esp)\n\t" /* dispatch */
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"pushl 28(%esp)\n\t" /* context */
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"pushl 28(%esp)\n\t" /* frame */
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"pushl 28(%esp)\n\t" /* rec */
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"call " __ASM_NAME("cxx_frame_handler") "\n\t"
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"add $28,%esp\n\t"
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"ret" );
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#endif /* __i386__ */
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/*********************************************************************
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* _CxxThrowException (MSVCRT.@)
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*/
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void _CxxThrowException( exception *object, const cxx_exception_type *type )
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{
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ULONG_PTR args[3];
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args[0] = CXX_FRAME_MAGIC;
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args[1] = (ULONG_PTR)object;
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args[2] = (ULONG_PTR)type;
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RaiseException( CXX_EXCEPTION, EH_NONCONTINUABLE, 3, args );
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}
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/*********************************************************************
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* __CxxDetectRethrow (MSVCRT.@)
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*/
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BOOL __CxxDetectRethrow(PEXCEPTION_POINTERS ptrs)
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{
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PEXCEPTION_RECORD rec;
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if (!ptrs)
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return FALSE;
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rec = ptrs->ExceptionRecord;
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if (rec->ExceptionCode == CXX_EXCEPTION &&
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rec->NumberParameters == 3 &&
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rec->ExceptionInformation[0] == CXX_FRAME_MAGIC &&
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rec->ExceptionInformation[2])
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{
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ptrs->ExceptionRecord = msvcrt_get_thread_data()->exc_record;
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return TRUE;
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}
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return (msvcrt_get_thread_data()->exc_record == rec);
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}
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/*********************************************************************
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* __CxxQueryExceptionSize (MSVCRT.@)
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*/
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unsigned int __CxxQueryExceptionSize(void)
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{
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return sizeof(cxx_exception_type);
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}
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