wine/dlls/msvcrt/cppexcept.h
2013-10-31 09:58:43 +01:00

221 lines
6.8 KiB
C

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