221 lines
6.8 KiB
C
221 lines
6.8 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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#ifndef __MSVCRT_CPPEXCEPT_H
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#define __MSVCRT_CPPEXCEPT_H
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#define CXX_FRAME_MAGIC_VC6 0x19930520
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#define CXX_FRAME_MAGIC_VC7 0x19930521
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#define CXX_FRAME_MAGIC_VC8 0x19930522
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#define CXX_EXCEPTION 0xe06d7363
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typedef void (*vtable_ptr)(void);
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/* type_info object, see cpp.c for implementation */
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typedef struct __type_info
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{
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const vtable_ptr *vtable;
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char *name; /* Unmangled name, allocated lazily */
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char mangled[32]; /* Variable length, but we declare it large enough for static RTTI */
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} type_info;
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/* exception object */
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typedef struct __exception
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{
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const vtable_ptr *vtable;
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char *name; /* Name of this exception, always a new copy for each object */
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int do_free; /* Whether to free 'name' in our dtor */
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} exception;
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typedef void (*cxx_copy_ctor)(void);
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/* offsets for computing the this pointer */
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typedef struct
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{
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int this_offset; /* offset of base class this pointer from start of object */
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int vbase_descr; /* offset of virtual base class descriptor */
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int vbase_offset; /* offset of this pointer offset in virtual base class descriptor */
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} this_ptr_offsets;
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/* complete information about a C++ type */
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#ifndef __x86_64__
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typedef struct __cxx_type_info
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{
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UINT flags; /* flags (see CLASS_* flags below) */
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const type_info *type_info; /* C++ type info */
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this_ptr_offsets offsets; /* offsets for computing the this pointer */
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unsigned int size; /* object size */
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cxx_copy_ctor copy_ctor; /* copy constructor */
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} cxx_type_info;
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#else
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typedef struct __cxx_type_info
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{
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UINT flags;
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unsigned int type_info;
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this_ptr_offsets offsets;
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unsigned int size;
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unsigned int copy_ctor;
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} cxx_type_info;
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#endif
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#define CLASS_IS_SIMPLE_TYPE 1
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#define CLASS_HAS_VIRTUAL_BASE_CLASS 4
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/* table of C++ types that apply for a given object */
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#ifndef __x86_64__
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typedef struct __cxx_type_info_table
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{
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UINT count; /* number of types */
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const cxx_type_info *info[3]; /* variable length, we declare it large enough for static RTTI */
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} cxx_type_info_table;
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#else
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typedef struct __cxx_type_info_table
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{
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UINT count;
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unsigned int info[3];
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} cxx_type_info_table;
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#endif
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struct __cxx_exception_frame;
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struct __cxx_function_descr;
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typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, struct __cxx_exception_frame*,
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PCONTEXT, EXCEPTION_REGISTRATION_RECORD**,
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const struct __cxx_function_descr*, int nested_trylevel,
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EXCEPTION_REGISTRATION_RECORD *nested_frame, DWORD unknown3 );
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/* type information for an exception object */
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#ifndef __x86_64__
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typedef struct __cxx_exception_type
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{
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UINT flags; /* TYPE_FLAG flags */
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void (*destructor)(void);/* exception object destructor */
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cxx_exc_custom_handler custom_handler; /* custom handler for this exception */
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const cxx_type_info_table *type_info_table; /* list of types for this exception object */
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} cxx_exception_type;
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#else
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typedef struct
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{
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UINT flags;
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unsigned int destructor;
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unsigned int custom_handler;
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unsigned int type_info_table;
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} cxx_exception_type;
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#endif
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void WINAPI _CxxThrowException(exception*,const cxx_exception_type*);
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int CDECL _XcptFilter(NTSTATUS, PEXCEPTION_POINTERS);
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static inline const char *dbgstr_type_info( const type_info *info )
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{
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if (!info) return "{}";
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return wine_dbg_sprintf( "{vtable=%p name=%s (%s)}",
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info->vtable, info->mangled, info->name ? info->name : "" );
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}
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/* compute the this pointer for a base class of a given type */
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static inline void *get_this_pointer( const this_ptr_offsets *off, void *object )
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{
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if (!object) return NULL;
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if (off->vbase_descr >= 0)
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{
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int *offset_ptr;
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/* move this ptr to vbase descriptor */
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object = (char *)object + off->vbase_descr;
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/* and fetch additional offset from vbase descriptor */
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offset_ptr = (int *)(*(char **)object + off->vbase_offset);
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object = (char *)object + *offset_ptr;
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}
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object = (char *)object + off->this_offset;
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return object;
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}
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#ifndef __x86_64__
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#define DEFINE_EXCEPTION_TYPE_INFO(type, base_no, cl1, cl2) \
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\
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static const cxx_type_info type ## _cxx_type_info = { \
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0, \
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& type ##_type_info, \
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{ 0, -1, 0 }, \
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sizeof(type), \
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(cxx_copy_ctor)THISCALL(MSVCRT_ ## type ##_copy_ctor) \
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}; \
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\
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static const cxx_type_info_table type ## _type_info_table = { \
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base_no+1, \
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{ \
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& type ## _cxx_type_info, \
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cl1, \
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cl2 \
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} \
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}; \
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\
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static const cxx_exception_type type ## _exception_type = { \
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0, \
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(cxx_copy_ctor)THISCALL(MSVCRT_ ## type ## _dtor), \
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NULL, \
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& type ## _type_info_table \
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};
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#else
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#define DEFINE_EXCEPTION_TYPE_INFO(type, base_no, cl1, cl2) \
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\
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static cxx_type_info type ## _cxx_type_info = { \
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0, \
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0xdeadbeef, \
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{ 0, -1, 0 }, \
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sizeof(type), \
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0xdeadbeef \
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}; \
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\
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static cxx_type_info_table type ## _type_info_table = { \
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base_no+1, \
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{ \
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0xdeadbeef, \
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0xdeadbeef, \
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0xdeadbeef \
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} \
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}; \
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\
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static cxx_exception_type type ##_exception_type = { \
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0, \
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0xdeadbeef, \
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0, \
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0xdeadbeef \
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}; \
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\
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static void init_ ## type ## _cxx(char *base) \
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{ \
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type ## _cxx_type_info.type_info = (char *)&type ## _type_info - base; \
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type ## _cxx_type_info.copy_ctor = (char *)MSVCRT_ ## type ## _copy_ctor - base; \
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type ## _type_info_table.info[0] = (char *)&type ## _cxx_type_info - base; \
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type ## _type_info_table.info[1] = (char *)cl1 - base; \
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type ## _type_info_table.info[2] = (char *)cl2 - base; \
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type ## _exception_type.destructor = (char *)MSVCRT_ ## type ## _dtor - base; \
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type ## _exception_type.type_info_table = (char *)&type ## _type_info_table - base; \
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}
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#endif
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#endif /* __MSVCRT_CPPEXCEPT_H */
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