libobjc/misc.c

   1 /* GNU Objective C Runtime Miscellaneous
   2    Copyright (C) 1993, 1994, 1995, 1996, 1997, 2002
   3    Free Software Foundation, Inc.
   4    Contributed by Kresten Krab Thorup
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify it
   9 under the terms of the GNU General Public License as published by the
  10 Free Software Foundation; either version 2, or (at your option) any
  11 later version.
  12
  13 GNU CC is distributed in the hope that it will be useful, but WITHOUT
  14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 02111-1307, USA.  */
  22
  23 /* As a special exception, if you link this library with files compiled with
  24    GCC to produce an executable, this does not cause the resulting executable
  25    to be covered by the GNU General Public License. This exception does not
  26    however invalidate any other reasons why the executable file might be
  27    covered by the GNU General Public License.  */
  28
  29 #define __USE_FIXED_PROTOTYPES__
  30 #include <stdlib.h>
  31 #include "runtime.h"
  32
  33 /*
  34 ** Error handler function
  35 ** NULL so that default is to just print to stderr
  36 */
  37 static objc_error_handler _objc_error_handler = NULL;
  38
  39 /* Trigger an objc error */
  40 void
  41 objc_error (id object, int code, const char *fmt, ...)
  42 {
  43   va_list ap;
  44
  45   va_start (ap, fmt);
  46   objc_verror (object, code, fmt, ap);
  47   va_end (ap);
  48 }
  49
  50 /* Trigger an objc error */
  51 void
  52 objc_verror (id object, int code, const char *fmt, va_list ap)
  53 {
  54   BOOL result = NO;
  55
  56   /* Call the error handler if its there
  57      Otherwise print to stderr */
  58   if (_objc_error_handler)
  59     result = (*_objc_error_handler) (object, code, fmt, ap);
  60   else
  61     vfprintf (stderr, fmt, ap);
  62
  63   /* Continue if the error handler says its ok
  64      Otherwise abort the program */
  65   if (result)
  66     return;
  67   else
  68     abort ();
  69 }
  70
  71 /* Set the error handler */
  72 objc_error_handler
  73 objc_set_error_handler (objc_error_handler func)
  74 {
  75   objc_error_handler temp = _objc_error_handler;
  76   _objc_error_handler = func;
  77   return temp;
  78 }
  79
  80 /*
  81 ** Standard functions for memory allocation and disposal.
  82 ** Users should use these functions in their ObjC programs so
  83 ** that they work properly with garbage collectors as well as
  84 ** can take advantage of the exception/error handling available.
  85 */
  86
  87 void *
  88 objc_malloc (size_t size)
  89 {
  90   void *res = (void *) (*_objc_malloc) (size);
  91   if (! res)
  92     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
  93   return res;
  94 }
  95
  96 void *
  97 objc_atomic_malloc (size_t size)
  98 {
  99   void *res = (void *) (*_objc_atomic_malloc) (size);
 100   if (! res)
 101     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 102   return res;
 103 }
 104
 105 void *
 106 objc_valloc (size_t size)
 107 {
 108   void *res = (void *) (*_objc_valloc) (size);
 109   if (! res)
 110     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 111   return res;
 112 }
 113
 114 void *
 115 objc_realloc (void *mem, size_t size)
 116 {
 117   void *res = (void *) (*_objc_realloc) (mem, size);
 118   if (! res)
 119     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 120   return res;
 121 }
 122
 123 void *
 124 objc_calloc (size_t nelem, size_t size)
 125 {
 126   void *res = (void *) (*_objc_calloc) (nelem, size);
 127   if (! res)
 128     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 129   return res;
 130 }
 131
 132 void
 133 objc_free (void *mem)
 134 {
 135   (*_objc_free) (mem);
 136 }
 137
 138 /*
 139 ** Hook functions for memory allocation and disposal.
 140 ** This makes it easy to substitute garbage collection systems
 141 ** such as Boehm's GC by assigning these function pointers
 142 ** to the GC's allocation routines.  By default these point
 143 ** to the ANSI standard malloc, realloc, free, etc.
 144 **
 145 ** Users should call the normal objc routines above for
 146 ** memory allocation and disposal within their programs.
 147 */
 148
 149 #if OBJC_WITH_GC
 150 #include <gc.h>
 151
 152 static void *
 153 GC_calloc (size_t nelem, size_t size)
 154 {
 155   void *p = GC_malloc (nelem * size);
 156   if (! p)
 157     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted!\n");
 158
 159   memset (p, 0, nelem * size);
 160   return p;
 161 }
 162
 163 static void
 164 noFree (void *p)
 165 {
 166 }
 167
 168 void *(*_objc_malloc) (size_t) = GC_malloc;
 169 void *(*_objc_atomic_malloc) (size_t) = GC_malloc_atomic;
 170 void *(*_objc_valloc) (size_t) = GC_malloc;
 171 void *(*_objc_realloc) (void *, size_t) = GC_realloc;
 172 void *(*_objc_calloc) (size_t, size_t) = GC_calloc;
 173 void (*_objc_free) (void *) = noFree;
 174
 175 #else   /* !OBJC_WITH_GC */
 176
 177 void *(*_objc_malloc) (size_t) = malloc;
 178 void *(*_objc_atomic_malloc) (size_t) = malloc;
 179 void *(*_objc_valloc) (size_t) = malloc;
 180 void *(*_objc_realloc) (void *, size_t) = realloc;
 181 void *(*_objc_calloc) (size_t, size_t) = calloc;
 182 void (*_objc_free) (void *) = free;
 183
 184
 185 #endif  /* !OBJC_WITH_GC */