cppexcept.h

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/*
 * 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
{
  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;

/* 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);

/* 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 */
    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(void*,const cxx_exception_type*);

#endif /* __MSVCRT_CPPEXCEPT_H */