dlls/msvcrt/cppexcept.h

   1 /*
   2  * msvcrt C++ exception handling
   3  *
   4  * Copyright 2002 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #ifndef __MSVCRT_CPPEXCEPT_H
  22 #define __MSVCRT_CPPEXCEPT_H
  23
  24 #define CXX_FRAME_MAGIC    0x19930520
  25 #define CXX_EXCEPTION      0xe06d7363
  26
  27 typedef void (*vtable_ptr)();
  28
  29 /* type_info object, see cpp.c for inplementation */
  30 typedef struct __type_info
  31 {
  32   vtable_ptr *vtable;
  33   char *name;        /* Unmangled name, allocated lazily */
  34   char  mangled[32]; /* Variable length, but we declare it large enough for static RTTI */
  35 } type_info;
  36
  37 /* the exception frame used by CxxFrameHandler */
  38 typedef struct __cxx_exception_frame
  39 {
  40     EXCEPTION_FRAME  frame;    /* the standard exception frame */
  41     int              trylevel;
  42     DWORD            ebp;
  43 } cxx_exception_frame;
  44
  45 /* info about a single catch {} block */
  46 typedef struct __catchblock_info
  47 {
  48     UINT       flags;         /* flags (see below) */
  49     type_info *type_info;     /* C++ type caught by this block */
  50     int        offset;        /* stack offset to copy exception object to */
  51     void     (*handler)();    /* catch block handler code */
  52 } catchblock_info;
  53 #define TYPE_FLAG_CONST      1
  54 #define TYPE_FLAG_VOLATILE   2
  55 #define TYPE_FLAG_REFERENCE  8
  56
  57 /* info about a single try {} block */
  58 typedef struct __tryblock_info
  59 {
  60     int              start_level;      /* start trylevel of that block */
  61     int              end_level;        /* end trylevel of that block */
  62     int              catch_level;      /* initial trylevel of the catch block */
  63     int              catchblock_count; /* count of catch blocks in array */
  64     catchblock_info *catchblock;       /* array of catch blocks */
  65 } tryblock_info;
  66
  67 /* info about the unwind handler for a given trylevel */
  68 typedef struct __unwind_info
  69 {
  70     int    prev;          /* prev trylevel unwind handler, to run after this one */
  71     void (*handler)();    /* unwind handler */
  72 } unwind_info;
  73
  74 /* descriptor of all try blocks of a given function */
  75 typedef struct __cxx_function_descr
  76 {
  77     UINT           magic;          /* must be CXX_FRAME_MAGIC */
  78     UINT           unwind_count;   /* number of unwind handlers */
  79     unwind_info   *unwind_table;   /* array of unwind handlers */
  80     UINT           tryblock_count; /* number of try blocks */
  81     tryblock_info *tryblock;       /* array of try blocks */
  82     UINT           unknown[3];
  83 } cxx_function_descr;
  84
  85 typedef void (*cxx_copy_ctor)(void);
  86
  87 /* complete information about a C++ type */
  88 typedef struct __cxx_type_info
  89 {
  90     UINT        flags;         /* flags (see CLASS_* flags below) */
  91     type_info  *type_info;     /* C++ type info */
  92     int         this_offset;   /* offset of base class this pointer from start of object */
  93     int         vbase_descr;   /* offset of virtual base class descriptor */
  94     int         vbase_offset;  /* offset of this pointer offset in virtual base class descriptor */
  95     size_t      size;          /* object size */
  96     cxx_copy_ctor copy_ctor;   /* copy constructor */
  97 } cxx_type_info;
  98 #define CLASS_IS_SIMPLE_TYPE          1
  99 #define CLASS_HAS_VIRTUAL_BASE_CLASS  4
 100
 101 /* table of C++ types that apply for a given object */
 102 typedef struct __cxx_type_info_table
 103 {
 104     UINT                 count;     /* number of types */
 105     const cxx_type_info *info[3];   /* variable length, we declare it large enough for static RTTI */
 106 } cxx_type_info_table;
 107
 108 typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, cxx_exception_frame*,
 109                                          PCONTEXT, struct __EXCEPTION_FRAME**,
 110                                          cxx_function_descr*, int nested_trylevel,
 111                                          EXCEPTION_FRAME *nested_frame, DWORD unknown3 );
 112
 113 /* type information for an exception object */
 114 typedef struct __cxx_exception_type
 115 {
 116     UINT                       flags;            /* TYPE_FLAG flags */
 117     void                     (*destructor)();    /* exception object destructor */
 118     cxx_exc_custom_handler     custom_handler;   /* custom handler for this exception */
 119     const cxx_type_info_table *type_info_table;  /* list of types for this exception object */
 120 } cxx_exception_type;
 121
 122 void _CxxThrowException(void*,const cxx_exception_type*);
 123
 124 #endif /* __MSVCRT_CPPEXCEPT_H */