First pass implementation of CxxFrameHandler (thanks to Juergen Schmied for help in testing it).
diff --git a/dlls/msvcrt/Makefile.in b/dlls/msvcrt/Makefile.in index 3b91fda..808555a 100644 --- a/dlls/msvcrt/Makefile.in +++ b/dlls/msvcrt/Makefile.in
@@ -13,6 +13,7 @@ C_SRCS = \ console.c \ cpp.c \ + cppexcept.c \ ctype.c \ data.c \ dir.c \
diff --git a/dlls/msvcrt/cppexcept.c b/dlls/msvcrt/cppexcept.c new file mode 100644 index 0000000..007d021 --- /dev/null +++ b/dlls/msvcrt/cppexcept.c
@@ -0,0 +1,436 @@ +/* + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * NOTES + * A good reference is the article "How a C++ compiler implements + * exception handling" by Vishal Kochhar, available on + * www.thecodeproject.com. + */ + +#include "config.h" +#include "wine/port.h" + +#include "ntddk.h" +#include "msvcrt.h" +#include "wine/exception.h" +#include "msvcrt/excpt.h" +#include "wine/debug.h" + +WINE_DEFAULT_DEBUG_CHANNEL(seh); + +#define CXX_FRAME_MAGIC 0x19930520 +#define CXX_EXCEPTION 0xe06d7363 + +typedef struct __type_info +{ + void *vtable; + void *data; + char name[1]; +} 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); + int trylevel; + DWORD ebp; +} cxx_exception_frame; + +/* info about a single catch {} block */ +typedef struct __catchblock_info +{ + UINT flags; /* flags (see below) */ + type_info *type_info; /* C++ type caught by this block */ + int offset; /* stack offset to copy exception object to */ + void (*handler)(); /* catch block handler code */ +} catchblock_info; +#define TYPE_FLAG_CONST 1 +#define TYPE_FLAG_VOLATILE 2 +#define TYPE_FLAG_REFERENCE 8 + +/* info about a single try {} block */ +typedef struct __tryblock_info +{ + int start_level; /* start trylevel of that block */ + int end_level; /* end trylevel of that block */ + int catch_level; /* initial trylevel of the catch block */ + int catchblock_count; /* count of catch blocks in array */ + catchblock_info *catchblock; /* array of catch blocks */ +} tryblock_info; + +/* info about the unwind handler for a given trylevel */ +typedef struct __unwind_info +{ + int prev; /* prev trylevel unwind handler, to run after this one */ + void (*handler)(); /* unwind handler */ +} unwind_info; + +/* descriptor of all try blocks of a given function */ +typedef struct __cxx_function_descr +{ + UINT magic; /* must be CXX_FRAME_MAGIC */ + UINT unwind_count; /* number of unwind handlers */ + unwind_info *unwind_table; /* array of unwind handlers */ + UINT tryblock_count; /* number of try blocks */ + tryblock_info *tryblock; /* array of try blocks */ + UINT unknown[3]; +} cxx_function_descr; + +/* complete information about a C++ type */ +typedef struct __cxx_type_info +{ + UINT flags; /* flags (see CLASS_* flags below) */ + type_info *type_info; /* C++ type info */ + int this_offset; /* offset of base class this pointer from start of object */ + int vbase_descr; /* offset of virtual base class descriptor */ + int vbase_offset; /* offset of this pointer offset in virtual base class descriptor */ + size_t size; /* object size */ + void (*copy_ctor)(); /* copy constructor */ +} cxx_type_info; +#define CLASS_IS_SIMPLE_TYPE 1 +#define CLASS_HAS_VIRTUAL_BASE_CLASS 4 + +/* table of C++ types that apply for a given object */ +typedef struct __cxx_type_info_table +{ + UINT count; /* number of types */ + cxx_type_info *info[1]; /* array of types */ +} 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 ); + +/* type information for an exception object */ +typedef struct __cxx_exception_type +{ + UINT flags; /* TYPE_FLAG flags */ + void (*destructor)(); /* exception object destructor */ + cxx_exc_custom_handler custom_handler; /* custom handler for this exception */ + cxx_type_info_table *type_info_table; /* list of types for this exception object */ +} cxx_exception_type; + + +#ifdef __i386__ /* CxxFrameHandler is not supported on non-i386 */ + +/* call a function with a given ebp */ +inline static void *call_ebp_func( void *func, void *ebp ) +{ + void *ret; + __asm__ __volatile__ ("pushl %%ebp; movl %2,%%ebp; call *%%eax;; popl %%ebp" \ + : "=a" (ret) : "0" (func), "g" (ebp)); + return ret; +} + +/* call a copy constructor */ +inline static 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 ); + 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), "g" (src) ); + else + __asm__ __volatile__("pushl %2; call *%0" + : : "r" (func), "c" (this), "g" (src) ); +} + +/* call the destructor of the exception object */ +inline static void call_dtor( void *func, void *object ) +{ + __asm__ __volatile__("call *%0" : : "r" (func), "c" (object) ); +} + + +static void dump_type( cxx_type_info *type ) +{ + DPRINTF( "flags %x type %p", type->flags, type->type_info ); + if (type->type_info) DPRINTF( " (%p %s)", type->type_info->data, type->type_info->name ); + DPRINTF( " offset %d vbase %d,%d size %d copy ctor %p\n", type->this_offset, + type->vbase_descr, type->vbase_offset, type->size, type->copy_ctor ); +} + +static void dump_exception_type( cxx_exception_type *type ) +{ + int i; + + DPRINTF( "exception type:\n" ); + DPRINTF( "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++) + { + DPRINTF( " %d: ", i ); + dump_type( type->type_info_table->info[i] ); + } +} + +static void dump_function_descr( cxx_function_descr *descr, cxx_exception_type *info ) +{ + int i, j; + + DPRINTF( "function descr:\n" ); + DPRINTF( "magic %x\n", descr->magic ); + DPRINTF( "unwind table: %p %d\n", descr->unwind_table, descr->unwind_count ); + for (i = 0; i < descr->unwind_count; i++) + { + DPRINTF( " %d: prev %d func %p\n", i, + descr->unwind_table[i].prev, descr->unwind_table[i].handler ); + } + DPRINTF( "try table: %p %d\n", descr->tryblock, descr->tryblock_count ); + for (i = 0; i < descr->tryblock_count; i++) + { + DPRINTF( " %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++) + { + catchblock_info *ptr = &descr->tryblock[i].catchblock[j]; + DPRINTF( " %d: flags %x offset %d handler %p type %p", + j, ptr->flags, ptr->offset, ptr->handler, ptr->type_info ); + if (ptr->type_info) DPRINTF( " (%p %s)", ptr->type_info->data, ptr->type_info->name ); + DPRINTF( "\n" ); + } + } +} + +/* compute the this pointer for a base class of a given type */ +static void *get_this_pointer( cxx_type_info *type, void *object ) +{ + void *this_ptr; + int *offset_ptr; + + if (!object) return NULL; + this_ptr = (char *)object + type->this_offset; + if (type->vbase_descr >= 0) + { + /* move this ptr to vbase descriptor */ + this_ptr = (char *)this_ptr + type->vbase_descr; + /* and fetch additional offset from vbase descriptor */ + offset_ptr = (int *)(*(char **)this_ptr + type->vbase_offset); + this_ptr = (char *)this_ptr + *offset_ptr; + } + return this_ptr; +} + +/* check if the exception type is caught by a given catch block, and return the type that matched */ +static cxx_type_info *find_caught_type( cxx_exception_type *exc_type, catchblock_info *catchblock ) +{ + UINT i; + + for (i = 0; i < exc_type->type_info_table->count; i++) + { + 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->name, type->type_info->name )) 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, + catchblock_info *catchblock, cxx_type_info *type ) +{ + void **dest_ptr; + + if (!catchblock->type_info || !catchblock->type_info->name[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, 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, *dest_ptr ); + } + else /* copy the object */ + { + if (type->copy_ctor) + call_copy_ctor( type->copy_ctor, dest_ptr, get_this_pointer(type,object), + (type->flags & CLASS_HAS_VIRTUAL_BASE_CLASS) ); + else + memmove( dest_ptr, get_this_pointer(type,object), type->size ); + } +} + +/* unwind the local function up to a given trylevel */ +static void cxx_local_unwind( cxx_exception_frame* frame, cxx_function_descr *descr, int last_level) +{ + void (*handler)(); + int trylevel = frame->trylevel; + + while (trylevel != last_level) + { + if (trylevel < 0 || 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; +} + +/* 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_exception_type *info ) +{ + int i, j; + void *addr, *object = (void *)rec->ExceptionInformation[1]; + + for (i = 0; i < descr->tryblock_count; i++) + { + 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++) + { + catchblock_info *catchblock = &tryblock->catchblock[j]; + 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 ); + + /* unwind the stack */ + RtlUnwind( unwind_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 ); + addr = call_ebp_func( catchblock->handler, &frame->ebp ); + if (info->destructor) call_dtor( info->destructor, object ); + TRACE( "done, continuing at %p\n", addr ); + return addr; + } + } + return NULL; +} + + +/********************************************************************* + * cxx_frame_handler + * + * Implementation of __CxxFrameHandler. + */ +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_exception_type *exc_type; + void *next_ip; + + if (descr->magic != CXX_FRAME_MAGIC) + { + ERR( "invalid frame magic %x\n", descr->magic ); + return ExceptionContinueSearch; + } + if (rec->ExceptionFlags & (EH_UNWINDING|EH_EXIT_UNWIND)) + { + if (descr->unwind_count) 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 ); + + normal_handler: + if (TRACE_ON(seh)) + { + TRACE("handling C++ exception rec %p frame %p trylevel %d descr %p\n", + rec, frame, frame->trylevel, descr ); + 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 ); + + if (!next_ip) return ExceptionContinueSearch; + context->Eip = (DWORD)next_ip; + context->Ebp = (DWORD)&frame->ebp; + context->Esp = ((DWORD*)frame)[-1]; + return ExceptionContinueExecution; +} + + +/********************************************************************* + * __CxxFrameHandler (MSVCRT.@) + */ +void __CxxFrameHandler( PEXCEPTION_RECORD rec, EXCEPTION_FRAME* frame, + PCONTEXT exc_context, EXCEPTION_FRAME** dispatch, + CONTEXT86 *context ) +{ + cxx_function_descr *descr = (cxx_function_descr *)context->Eax; + context->Eax = cxx_frame_handler( rec, (cxx_exception_frame *)frame, + exc_context, dispatch, descr, context ); +} + +#endif /* __i386__ */ + +/********************************************************************* + * _CxxThrowException (MSVCRT.@) + */ +void _CxxThrowException( void *object, cxx_exception_type *type ) +{ + DWORD args[3]; + + args[0] = CXX_FRAME_MAGIC; + args[1] = (DWORD)object; + args[2] = (DWORD)type; + RaiseException( CXX_EXCEPTION, EH_NONCONTINUABLE, 3, args ); +}
diff --git a/dlls/msvcrt/except.c b/dlls/msvcrt/except.c index 9f9c731..ffdc271 100644 --- a/dlls/msvcrt/except.c +++ b/dlls/msvcrt/except.c
@@ -373,20 +373,3 @@ FIXME("(%d %p):stub\n", sig, func); return (void*)-1; } - -/********************************************************************* - * __CxxFrameHandler (MSVCRT.@) - */ -DWORD __CxxFrameHandler(PEXCEPTION_RECORD rec, struct __EXCEPTION_FRAME* frame, - PCONTEXT context, struct __EXCEPTION_FRAME** dispatch) -{ - FIXME("(%p,%p,%p,%p):stub?\n",rec,frame,context,dispatch); - - /* Copied from MSVCRT_nested_handler, I hope this is more - * or less the right thing to do - */ - if (rec->ExceptionFlags & 0x6) - return ExceptionContinueSearch; - *dispatch = frame; - return ExceptionCollidedUnwind; -}
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec index d539216..10ec13c 100644 --- a/dlls/msvcrt/msvcrt.spec +++ b/dlls/msvcrt/msvcrt.spec
@@ -68,7 +68,7 @@ @ cdecl -noimport _CIsqrt() _CIsqrt @ cdecl -noimport _CItan() _CItan @ cdecl -noimport _CItanh() _CItanh -@ stub _CxxThrowException +@ cdecl _CxxThrowException(long long) _CxxThrowException @ cdecl -i386 -norelay _EH_prolog() _EH_prolog @ cdecl _Getdays() _Getdays @ cdecl _Getmonths() _Getmonths @@ -76,7 +76,7 @@ @ extern _HUGE MSVCRT__HUGE @ cdecl _Strftime(str long str ptr ptr) _Strftime @ cdecl _XcptFilter(long ptr) _XcptFilter -@ cdecl __CxxFrameHandler(ptr ptr ptr ptr) __CxxFrameHandler +@ cdecl -register -i386 __CxxFrameHandler(ptr ptr ptr ptr) __CxxFrameHandler @ stub __CxxLongjmpUnwind @ cdecl -noimport __RTCastToVoid(ptr) MSVCRT___RTCastToVoid @ cdecl -noimport __RTDynamicCast(ptr long ptr ptr long) MSVCRT___RTDynamicCast