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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #ifndef __MSVCRT_CPPEXCEPT_H
  22 #define __MSVCRT_CPPEXCEPT_H
  23
  24 #include "wine/asm.h"
  25
  26 #define CXX_FRAME_MAGIC_VC6 0x19930520
  27 #define CXX_FRAME_MAGIC_VC7 0x19930521
  28 #define CXX_FRAME_MAGIC_VC8 0x19930522
  29 #define CXX_EXCEPTION       0xe06d7363
  30
  31 #define FUNC_DESCR_SYNCHRONOUS  1 /* synchronous exceptions only (built with /EHs and /EHsc) */
  32 #define FUNC_DESCR_NOEXCEPT     4 /* noexcept function */
  33
  34 typedef void (*vtable_ptr)(void);
  35
  36 /* type_info object, see cpp.c for implementation */
  37 typedef struct __type_info
  38 {
  39   const vtable_ptr *vtable;
  40   char              *name;        /* Unmangled name, allocated lazily */
  41   char               mangled[64]; /* Variable length, but we declare it large enough for static RTTI */
  42 } type_info;
  43
  44 /* exception object */
  45 typedef struct __exception
  46 {
  47   const vtable_ptr *vtable;
  48   char             *name;    /* Name of this exception, always a new copy for each object */
  49   BOOL              do_free; /* Whether to free 'name' in our dtor */
  50 } exception;
  51
  52 typedef void (*cxx_copy_ctor)(void);
  53
  54 /* offsets for computing the this pointer */
  55 typedef struct
  56 {
  57     int         this_offset;   /* offset of base class this pointer from start of object */
  58     int         vbase_descr;   /* offset of virtual base class descriptor */
  59     int         vbase_offset;  /* offset of this pointer offset in virtual base class descriptor */
  60 } this_ptr_offsets;
  61
  62 /* complete information about a C++ type */
  63 #ifndef __x86_64__
  64 typedef struct __cxx_type_info
  65 {
  66     UINT             flags;        /* flags (see CLASS_* flags below) */
  67     const type_info *type_info;    /* C++ type info */
  68     this_ptr_offsets offsets;      /* offsets for computing the this pointer */
  69     unsigned int     size;         /* object size */
  70     cxx_copy_ctor    copy_ctor;    /* copy constructor */
  71 } cxx_type_info;
  72 #else
  73 typedef struct __cxx_type_info
  74 {
  75     UINT flags;
  76     unsigned int type_info;
  77     this_ptr_offsets offsets;
  78     unsigned int size;
  79     unsigned int copy_ctor;
  80 } cxx_type_info;
  81 #endif
  82
  83 #define CLASS_IS_SIMPLE_TYPE          1
  84 #define CLASS_HAS_VIRTUAL_BASE_CLASS  4
  85
  86 /* table of C++ types that apply for a given object */
  87 #ifndef __x86_64__
  88 typedef struct __cxx_type_info_table
  89 {
  90     UINT                 count;     /* number of types */
  91     const cxx_type_info *info[3];   /* variable length, we declare it large enough for static RTTI */
  92 } cxx_type_info_table;
  93 #else
  94 typedef struct __cxx_type_info_table
  95 {
  96     UINT count;
  97     unsigned int info[3];
  98 } cxx_type_info_table;
  99 #endif
 100
 101 struct __cxx_exception_frame;
 102 struct __cxx_function_descr;
 103
 104 typedef DWORD (*cxx_exc_custom_handler)( PEXCEPTION_RECORD, struct __cxx_exception_frame*,
 105                                          PCONTEXT, EXCEPTION_REGISTRATION_RECORD**,
 106                                          const struct __cxx_function_descr*, int nested_trylevel,
 107                                          EXCEPTION_REGISTRATION_RECORD *nested_frame, DWORD unknown3 );
 108
 109 /* type information for an exception object */
 110 #ifndef __x86_64__
 111 typedef struct __cxx_exception_type
 112 {
 113     UINT                       flags;            /* TYPE_FLAG flags */
 114     void                     (*destructor)(void);/* exception object destructor */
 115     cxx_exc_custom_handler     custom_handler;   /* custom handler for this exception */
 116     const cxx_type_info_table *type_info_table;  /* list of types for this exception object */
 117 } cxx_exception_type;
 118 #else
 119 typedef struct
 120 {
 121     UINT flags;
 122     unsigned int destructor;
 123     unsigned int custom_handler;
 124     unsigned int type_info_table;
 125 } cxx_exception_type;
 126 #endif
 127
 128 void WINAPI _CxxThrowException(exception*,const cxx_exception_type*);
 129 int CDECL _XcptFilter(NTSTATUS, PEXCEPTION_POINTERS);
 130
 131 static inline const char *dbgstr_type_info( const type_info *info )
 132 {
 133     if (!info) return "{}";
 134     return wine_dbg_sprintf( "{vtable=%p name=%s (%s)}",
 135                              info->vtable, info->mangled, info->name ? info->name : "" );
 136 }
 137
 138 /* compute the this pointer for a base class of a given type */
 139 static inline void *get_this_pointer( const this_ptr_offsets *off, void *object )
 140 {
 141     if (!object) return NULL;
 142
 143     if (off->vbase_descr >= 0)
 144     {
 145         int *offset_ptr;
 146
 147         /* move this ptr to vbase descriptor */
 148         object = (char *)object + off->vbase_descr;
 149         /* and fetch additional offset from vbase descriptor */
 150         offset_ptr = (int *)(*(char **)object + off->vbase_offset);
 151         object = (char *)object + *offset_ptr;
 152     }
 153
 154     object = (char *)object + off->this_offset;
 155     return object;
 156 }
 157
 158 #ifndef __x86_64__
 159 #define DEFINE_EXCEPTION_TYPE_INFO(type, base_no, cl1, cl2)  \
 160 \
 161 static const cxx_type_info type ## _cxx_type_info = { \
 162     0, \
 163     & type ##_type_info, \
 164     { 0, -1, 0 }, \
 165     sizeof(type), \
 166     (cxx_copy_ctor)THISCALL(type ##_copy_ctor) \
 167 }; \
 168 \
 169 static const cxx_type_info_table type ## _type_info_table = { \
 170     base_no+1, \
 171     { \
 172         & type ## _cxx_type_info, \
 173         cl1, \
 174         cl2 \
 175     } \
 176 }; \
 177 \
 178 static const cxx_exception_type type ## _exception_type = { \
 179     0, \
 180     (cxx_copy_ctor)THISCALL(type ## _dtor), \
 181     NULL, \
 182     & type ## _type_info_table \
 183 };
 184
 185 #else
 186
 187 #define DEFINE_EXCEPTION_TYPE_INFO(type, base_no, cl1, cl2)  \
 188 \
 189 static cxx_type_info type ## _cxx_type_info = { \
 190     0, \
 191     0xdeadbeef, \
 192     { 0, -1, 0 }, \
 193     sizeof(type), \
 194     0xdeadbeef \
 195 }; \
 196 \
 197 static cxx_type_info_table type ## _type_info_table = { \
 198     base_no+1, \
 199     { \
 200         0xdeadbeef, \
 201         0xdeadbeef, \
 202         0xdeadbeef  \
 203     } \
 204 }; \
 205 \
 206 static cxx_exception_type type ##_exception_type = { \
 207     0, \
 208     0xdeadbeef, \
 209     0, \
 210     0xdeadbeef \
 211 }; \
 212 \
 213 static void init_ ## type ## _cxx(char *base) \
 214 { \
 215     type ## _cxx_type_info.type_info  = (char *)&type ## _type_info - base; \
 216     type ## _cxx_type_info.copy_ctor  = (char *)type ## _copy_ctor - base; \
 217     type ## _type_info_table.info[0]   = (char *)&type ## _cxx_type_info - base; \
 218     type ## _type_info_table.info[1]   = (char *)cl1 - base; \
 219     type ## _type_info_table.info[2]   = (char *)cl2 - base; \
 220     type ## _exception_type.destructor      = (char *)type ## _dtor - base; \
 221     type ## _exception_type.type_info_table = (char *)&type ## _type_info_table - base; \
 222 }
 223 #endif
 224
 225 #endif /* __MSVCRT_CPPEXCEPT_H */