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reactos/sdk/lib/crt/except/cppexcept.c

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/*
* msvcrt C++ exception handling
*
* Copyright 2002 Alexandre Julliard
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* NOTES
* A good reference is the article "How a C++ compiler implements
* exception handling" by Vishal Kochhar, available on
* www.thecodeproject.com.
*/
#define __WINE_DEBUG_CHANNEL__
#include <precomp.h>
#include <stdarg.h>
#include <wine/exception.h>
#include <internal/wine/msvcrt.h>
#include <internal/wine/cppexcept.h>
#ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */
WINE_DEFAULT_DEBUG_CHANNEL(seh);
DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
const cxx_function_descr *descr,
EXCEPTION_REGISTRATION_RECORD* nested_frame, int nested_trylevel );
/* call a function with a given ebp */
#ifdef _MSC_VER
#pragma warning(disable:4731) // don't warn about modification of ebp
#endif
static inline void *call_ebp_func( void *func, void *_ebp )
{
void *result;
#ifdef _MSC_VER
__asm
{
mov eax, func
push ebx
push ebp
mov ebp, _ebp
call eax
pop ebp
pop ebx
mov result, eax
}
#else
int dummy;
__asm__ __volatile__ ("pushl %%ebx\n\t"
"pushl %%ebp\n\t"
"movl %4,%%ebp\n\t"
"call *%%eax\n\t"
"popl %%ebp\n\t"
"popl %%ebx"
: "=a" (result), "=S" (dummy), "=D" (dummy)
: "0" (func), "1" (_ebp) : "ecx", "edx", "memory" );
#endif
return result;
}
#ifdef _MSC_VER
#pragma warning(default:4731)
#endif
/* call a copy constructor */
static inline void call_copy_ctor( void *func, void *this, void *src, int has_vbase )
{
TRACE( "calling copy ctor %p object %p src %p\n", func, this, src );
#ifdef _MSC_VER
if (has_vbase)
{
__asm
{
mov ecx, this
push 1
push src
call func
}
}
else
{
__asm
{
mov ecx, this
push src
call func
}
}
#else
if (has_vbase)
/* in that case copy ctor takes an extra bool indicating whether to copy the base class */
__asm__ __volatile__("pushl $1; pushl %2; call *%0"
: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
else
__asm__ __volatile__("pushl %2; call *%0"
: : "r" (func), "c" (this), "r" (src) : "eax", "edx", "memory" );
#endif
}
/* call the destructor of the exception object */
static inline void call_dtor( void *func, void *object )
{
#ifdef _MSC_VER
__asm
{
mov ecx, object
call func
}
#else
__asm__ __volatile__("call *%0" : : "r" (func), "c" (object) : "eax", "edx", "memory" );
#endif
}
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable:4731)
/* continue execution to the specified address after exception is caught */
__forceinline void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr )
{
__asm
{
mov eax, addr
mov edx, frame
mov esp, [edx-4]
lea ebp, [edx+12]
jmp eax
}
for (;;) ; /* unreached */
}
#pragma warning(pop)
#else
/* continue execution to the specified address after exception is caught */
static inline void DECLSPEC_NORETURN continue_after_catch( cxx_exception_frame* frame, void *addr )
{
__asm__ __volatile__("movl -4(%0),%%esp; leal 12(%0),%%ebp; jmp *%1"
: : "r" (frame), "a" (addr) );
for (;;) ; /* unreached */
}
#endif
static inline void dump_type( const cxx_type_info *type )
{
TRACE( "flags %x type %p %s offsets %d,%d,%d size %d copy ctor %p\n",
type->flags, type->type_info, dbgstr_type_info(type->type_info),
type->offsets.this_offset, type->offsets.vbase_descr, type->offsets.vbase_offset,
type->size, type->copy_ctor );
}
static void dump_exception_type( const cxx_exception_type *type )
{
UINT i;
TRACE( "flags %x destr %p handler %p type info %p\n",
type->flags, type->destructor, type->custom_handler, type->type_info_table );
for (i = 0; i < type->type_info_table->count; i++)
{
TRACE( " %d: ", i );
dump_type( type->type_info_table->info[i] );
}
}
static void dump_function_descr( const cxx_function_descr *descr )
{
#ifndef WINE_NO_TRACE_MSGS
UINT i;
int j;
TRACE( "magic %x\n", descr->magic );
TRACE( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count );
for (i = 0; i < descr->unwind_count; i++)
{
TRACE( " %d: prev %d func %p\n", i,
descr->unwind_table[i].prev, descr->unwind_table[i].handler );
}
TRACE( "try table: %p %d\n", descr->tryblock, descr->tryblock_count );
for (i = 0; i < descr->tryblock_count; i++)
{
TRACE( " %d: start %d end %d catchlevel %d catch %p %d\n", i,
descr->tryblock[i].start_level, descr->tryblock[i].end_level,
descr->tryblock[i].catch_level, descr->tryblock[i].catchblock,
descr->tryblock[i].catchblock_count );
for (j = 0; j < descr->tryblock[i].catchblock_count; j++)
{
const catchblock_info *ptr = &descr->tryblock[i].catchblock[j];
TRACE( " %d: flags %x offset %d handler %p type %p %s\n",
j, ptr->flags, ptr->offset, ptr->handler,
ptr->type_info, dbgstr_type_info( ptr->type_info ) );
}
}
#endif
if (descr->magic <= CXX_FRAME_MAGIC_VC6) return;
TRACE( "expect list: %p\n", descr->expect_list );
if (descr->magic <= CXX_FRAME_MAGIC_VC7) return;
TRACE( "flags: %08x\n", descr->flags );
}
/* check if the exception type is caught by a given catch block, and return the type that matched */
static const cxx_type_info *find_caught_type( cxx_exception_type *exc_type,
const catchblock_info *catchblock )
{
UINT i;
for (i = 0; i < exc_type->type_info_table->count; i++)
{
const cxx_type_info *type = exc_type->type_info_table->info[i];
if (!catchblock->type_info) return type; /* catch(...) matches any type */
if (catchblock->type_info != type->type_info)
{
if (strcmp( catchblock->type_info->mangled, type->type_info->mangled )) continue;
}
/* type is the same, now check the flags */
if ((exc_type->flags & TYPE_FLAG_CONST) &&
!(catchblock->flags & TYPE_FLAG_CONST)) continue;
if ((exc_type->flags & TYPE_FLAG_VOLATILE) &&
!(catchblock->flags & TYPE_FLAG_VOLATILE)) continue;
return type; /* it matched */
}
return NULL;
}
/* copy the exception object where the catch block wants it */
static void copy_exception( void *object, cxx_exception_frame *frame,
const catchblock_info *catchblock, const cxx_type_info *type )
{
void **dest_ptr;
if (!catchblock->type_info || !catchblock->type_info->mangled[0]) return;
if (!catchblock->offset) return;
dest_ptr = (void **)((char *)&frame->ebp + catchblock->offset);
if (catchblock->flags & TYPE_FLAG_REFERENCE)
{
*dest_ptr = get_this_pointer( &type->offsets, object );
}
else if (type->flags & CLASS_IS_SIMPLE_TYPE)
{
memmove( dest_ptr, object, type->size );
/* if it is a pointer, adjust it */
if (type->size == sizeof(void *)) *dest_ptr = get_this_pointer( &type->offsets, *dest_ptr );
}
else /* copy the object */
{
if (type->copy_ctor)
call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(&type->offsets,object),
(type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) );
else
memmove( dest_ptr, get_this_pointer(&type->offsets,object), type->size );
}
}
/* unwind the local function up to a given trylevel */
static void cxx_local_unwind( cxx_exception_frame* frame, const cxx_function_descr *descr, int last_level)
{
void (*handler)(void);
int trylevel = frame->trylevel;
while (trylevel != last_level)
{
if (trylevel < 0 || (unsigned)trylevel >= descr->unwind_count)
{
ERR( "invalid trylevel %d\n", trylevel );
MSVCRT_terminate();
}
handler = descr->unwind_table[trylevel].handler;
if (handler)
{
TRACE( "calling unwind handler %p trylevel %d last %d ebp %p\n",
handler, trylevel, last_level, &frame->ebp );
call_ebp_func( handler, &frame->ebp );
}
trylevel = descr->unwind_table[trylevel].prev;
}
frame->trylevel = last_level;
}
/* exception frame for nested exceptions in catch block */
struct catch_func_nested_frame
{
EXCEPTION_REGISTRATION_RECORD frame; /* standard exception frame */
EXCEPTION_RECORD *prev_rec; /* previous record to restore in thread data */
cxx_exception_frame *cxx_frame; /* frame of parent exception */
const cxx_function_descr *descr; /* descriptor of parent exception */
int trylevel; /* current try level */
EXCEPTION_RECORD *rec; /* rec associated with frame */
};
/* handler for exceptions happening while calling a catch function */
static DWORD catch_function_nested_handler( EXCEPTION_RECORD *rec, EXCEPTION_REGISTRATION_RECORD *frame,
CONTEXT *context, EXCEPTION_REGISTRATION_RECORD **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;
}
TRACE( "got nested exception in catch function\n" );
if(rec->ExceptionCode == CXX_EXCEPTION)
{
PEXCEPTION_RECORD prev_rec = nested_frame->rec;
if(rec->ExceptionInformation[1] == 0 && rec->ExceptionInformation[2] == 0)
{
/* exception was rethrown */
rec->ExceptionInformation[1] = prev_rec->ExceptionInformation[1];
rec->ExceptionInformation[2] = prev_rec->ExceptionInformation[2];
TRACE("detect rethrow: re-propagate: obj: %lx, type: %lx\n",
rec->ExceptionInformation[1], rec->ExceptionInformation[2]);
}
else {
/* new exception in exception handler, destroy old */
void *object = (void*)prev_rec->ExceptionInformation[1];
cxx_exception_type *info = (cxx_exception_type*) prev_rec->ExceptionInformation[2];
TRACE("detect threw new exception in catch block - destroy old(obj: %p type: %p)\n",
object, info);
if(info && info->destructor)
call_dtor( info->destructor, object );
}
}
return cxx_frame_handler( rec, nested_frame->cxx_frame, context,
NULL, nested_frame->descr, &nested_frame->frame,
nested_frame->trylevel );
}
/* find and call the appropriate catch block for an exception */
/* returns the address to continue execution to after the catch block was called */
static inline void call_catch_block( PEXCEPTION_RECORD rec, cxx_exception_frame *frame,
const cxx_function_descr *descr, int nested_trylevel,
cxx_exception_type *info )
{
UINT i;
int j;
void *addr, *object = (void *)rec->ExceptionInformation[1];
struct catch_func_nested_frame nested_frame;
int trylevel = frame->trylevel;
thread_data_t *thread_data = msvcrt_get_thread_data();
DWORD save_esp = ((DWORD*)frame)[-1];
for (i = 0; i < descr->tryblock_count; i++)
{
const tryblock_info *tryblock = &descr->tryblock[i];
if (trylevel < tryblock->start_level) continue;
if (trylevel > tryblock->end_level) continue;
/* got a try block */
for (j = 0; j < tryblock->catchblock_count; j++)
{
const catchblock_info *catchblock = &tryblock->catchblock[j];
if(info)
{
const cxx_type_info *type = find_caught_type( info, catchblock );
if (!type) continue;
TRACE( "matched type %p in tryblock %d catchblock %d\n", type, i, j );
/* copy the exception to its destination on the stack */
copy_exception( object, frame, catchblock, type );
}
else
{
/* no CXX_EXCEPTION only proceed with a catch(...) block*/
if(catchblock->type_info)
continue;
TRACE("found catch(...) block\n");
}
/* unwind the stack */
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 addr %p ebp %p\n",
catchblock, catchblock->handler, &frame->ebp );
/* setup an exception block for nested exceptions */
nested_frame.frame.Handler = (PEXCEPTION_ROUTINE)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;
nested_frame.rec = rec;
__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 );
((DWORD*)frame)[-1] = save_esp;
if (info && info->destructor) call_dtor( info->destructor, object );
TRACE( "done, continuing at %p\n", addr );
continue_after_catch( frame, addr );
}
}
}
/*********************************************************************
* cxx_frame_handler
*
* Implementation of __CxxFrameHandler.
*/
DWORD CDECL cxx_frame_handler( PEXCEPTION_RECORD rec, cxx_exception_frame* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch,
const cxx_function_descr *descr,
EXCEPTION_REGISTRATION_RECORD* nested_frame,
int nested_trylevel )
{
cxx_exception_type *exc_type;
if (descr->magic < CXX_FRAME_MAGIC_VC6 || descr->magic > CXX_FRAME_MAGIC_VC8)
{
ERR( "invalid frame magic %x\n", descr->magic );
return ExceptionContinueSearch;
}
if (descr->magic >= CXX_FRAME_MAGIC_VC8 &&
(descr->flags & FUNC_DESCR_SYNCHRONOUS) &&
(rec->ExceptionCode != CXX_EXCEPTION))
return ExceptionContinueSearch; /* handle only c++ exceptions */
if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND))
{
if (descr->unwind_count && !nested_trylevel) cxx_local_unwind( frame, descr, -1 );
return ExceptionContinueSearch;
}
if (!descr->tryblock_count) return ExceptionContinueSearch;
if(rec->ExceptionCode == CXX_EXCEPTION)
{
exc_type = (cxx_exception_type *)rec->ExceptionInformation[2];
if (rec->ExceptionInformation[0] > CXX_FRAME_MAGIC_VC8 &&
exc_type->custom_handler)
{
return exc_type->custom_handler( rec, frame, context, dispatch,
descr, nested_trylevel, nested_frame, 0 );
}
if (TRACE_ON(seh))
{
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 );
}
}
else
{
exc_type = NULL;
TRACE("handling C exception code %x rec %p frame %p trylevel %d descr %p nested_frame %p\n",
rec->ExceptionCode, rec, frame, frame->trylevel, descr, nested_frame );
}
call_catch_block( rec, frame, descr, frame->trylevel, exc_type );
return ExceptionContinueSearch;
}
/*********************************************************************
* __CxxFrameHandler (MSVCRT.@)
*/
extern DWORD CDECL __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch );
#ifdef _MSC_VER
DWORD _declspec(naked) __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_REGISTRATION_RECORD* frame,
PCONTEXT context, EXCEPTION_REGISTRATION_RECORD** dispatch )
{
__asm
{
push 0
push 0
push eax
push [esp + 28]
push [esp + 28]
push [esp + 28]
push [esp + 28]
call cxx_frame_handler
add esp, 28
ret
}
}
#else
__ASM_GLOBAL_FUNC( __CxxFrameHandler,
"pushl $0\n\t" /* nested_trylevel */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl $0\n\t" /* nested_frame */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl %eax\n\t" /* descr */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* dispatch */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* context */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* frame */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"pushl 28(%esp)\n\t" /* rec */
__ASM_CFI(".cfi_adjust_cfa_offset 4\n\t")
"call " __ASM_NAME("cxx_frame_handler") "\n\t"
"add $28,%esp\n\t"
__ASM_CFI(".cfi_adjust_cfa_offset -28\n\t")
"ret" )
#endif
/*********************************************************************
* __CxxLongjmpUnwind (MSVCRT.@)
*
* Callback meant to be used as UnwindFunc for setjmp/longjmp.
*/
void __stdcall __CxxLongjmpUnwind( const struct __JUMP_BUFFER *buf )
{
cxx_exception_frame *frame = (cxx_exception_frame *)buf->Registration;
const cxx_function_descr *descr = (const cxx_function_descr *)buf->UnwindData[0];
TRACE( "unwinding frame %p descr %p trylevel %ld\n", frame, descr, buf->TryLevel );
cxx_local_unwind( frame, descr, buf->TryLevel );
}
#endif /* __i386__ */
/*********************************************************************
* __CppXcptFilter (MSVCRT.@)
*/
int CDECL __CppXcptFilter(NTSTATUS ex, PEXCEPTION_POINTERS ptr)
{
/* only filter c++ exceptions */
if (ex != CXX_EXCEPTION) return EXCEPTION_CONTINUE_SEARCH;
return _XcptFilter( ex, ptr );
}
/*********************************************************************
* _CxxThrowException (MSVCRT.@)
*/
void WINAPI _CxxThrowException( exception *object, const cxx_exception_type *type )
{
ULONG_PTR args[3];
args[0] = CXX_FRAME_MAGIC_VC6;
args[1] = (ULONG_PTR)object;
args[2] = (ULONG_PTR)type;
RaiseException( CXX_EXCEPTION, EH_NONCONTINUABLE, 3, args );
}
/*********************************************************************
* __CxxDetectRethrow (MSVCRT.@)
*/
BOOL CDECL __CxxDetectRethrow(PEXCEPTION_POINTERS ptrs)
{
PEXCEPTION_RECORD rec;
if (!ptrs)
return FALSE;
rec = ptrs->ExceptionRecord;
if (rec->ExceptionCode == CXX_EXCEPTION &&
rec->NumberParameters == 3 &&
rec->ExceptionInformation[0] == CXX_FRAME_MAGIC_VC6 &&
rec->ExceptionInformation[2])
{
ptrs->ExceptionRecord = msvcrt_get_thread_data()->exc_record;
return TRUE;
}
return (msvcrt_get_thread_data()->exc_record == rec);
}
/*********************************************************************
* __CxxQueryExceptionSize (MSVCRT.@)
*/
unsigned int CDECL __CxxQueryExceptionSize(void)
{
return sizeof(cxx_exception_type);
}
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