wine/dlls/msvcrt/cppexcept.h
Alexandre Julliard 5d5f523052 Output the virtual tables for the exception classes using assembly so
that they can have the correct layout, and get rid of the
corresponding hacks in RTTI_GetObjectLocator.
Build more of the code on non-i386 platforms too.
Protect __RTDynamicCast and friends with exception handlers.
Fix handling of the vtable pointer so that we don't need to declare
all object pointers as type_info.
2004-10-19 04:03:07 +00:00

171 lines
6.4 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __MSVCRT_CPPEXCEPT_H
#define __MSVCRT_CPPEXCEPT_H
#define CXX_FRAME_MAGIC 0x19930520
#define CXX_EXCEPTION 0xe06d7363
typedef void (*vtable_ptr)();
/* type_info object, see cpp.c for inplementation */
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 */
int do_free; /* Whether to free 'name' in our dtor */
} exception;
/* the exception frame used by CxxFrameHandler */
typedef struct __cxx_exception_frame
{
EXCEPTION_REGISTRATION_RECORD frame; /* the standard exception frame */
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;
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 */
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 */
size_t size; /* object size */
cxx_copy_ctor 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 */
const cxx_type_info *info[3]; /* variable length, we declare it large enough for static RTTI */
} cxx_type_info_table;
typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, cxx_exception_frame*,
PCONTEXT, EXCEPTION_REGISTRATION_RECORD**,
cxx_function_descr*, int nested_trylevel,
EXCEPTION_REGISTRATION_RECORD *nested_frame, 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 */
const cxx_type_info_table *type_info_table; /* list of types for this exception object */
} cxx_exception_type;
void _CxxThrowException(exception*,const cxx_exception_type*);
/* get the vtable pointer for a C++ object */
static inline const vtable_ptr *get_vtable( void *obj )
{
return *(const vtable_ptr **)obj;
}
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 )
{
void *this_ptr;
int *offset_ptr;
if (!object) return NULL;
this_ptr = (char *)object + off->this_offset;
if (off->vbase_descr >= 0)
{
/* move this ptr to vbase descriptor */
this_ptr = (char *)this_ptr + off->vbase_descr;
/* and fetch additional offset from vbase descriptor */
offset_ptr = (int *)(*(char **)this_ptr + off->vbase_offset);
this_ptr = (char *)this_ptr + *offset_ptr;
}
return this_ptr;
}
#endif /* __MSVCRT_CPPEXCEPT_H */