libobjc/misc.c

   1 /* GNU Objective C Runtime Miscellaneous
   2    Copyright (C) 1993, 1994, 1995, 1996, 1997, 2002, 2009
   3    Free Software Foundation, Inc.
   4    Contributed by Kresten Krab Thorup
   5
   6 This file is part of GCC.
   7
   8 GCC 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 3, or (at your option) any
  11 later version.
  12
  13 GCC 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 Under Section 7 of GPL version 3, you are granted additional
  19 permissions described in the GCC Runtime Library Exception, version
  20 3.1, as published by the Free Software Foundation.
  21
  22 You should have received a copy of the GNU General Public License and
  23 a copy of the GCC Runtime Library Exception along with this program;
  24 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25 <http://www.gnu.org/licenses/>.  */
  26
  27
  28 #define __USE_FIXED_PROTOTYPES__
  29 #include <stdlib.h>
  30 #include "objc/runtime.h"
  31
  32 /*
  33 ** Error handler function
  34 ** NULL so that default is to just print to stderr
  35 */
  36 static objc_error_handler _objc_error_handler = NULL;
  37
  38 /* Trigger an objc error */
  39 void
  40 objc_error (id object, int code, const char *fmt, ...)
  41 {
  42   va_list ap;
  43
  44   va_start (ap, fmt);
  45   objc_verror (object, code, fmt, ap);
  46   va_end (ap);
  47 }
  48
  49 /* Trigger an objc error */
  50 void
  51 objc_verror (id object, int code, const char *fmt, va_list ap)
  52 {
  53   BOOL result = NO;
  54
  55   /* Call the error handler if its there
  56      Otherwise print to stderr */
  57   if (_objc_error_handler)
  58     result = (*_objc_error_handler) (object, code, fmt, ap);
  59   else
  60     vfprintf (stderr, fmt, ap);
  61
  62   /* Continue if the error handler says its ok
  63      Otherwise abort the program */
  64   if (result)
  65     return;
  66   else
  67     abort ();
  68 }
  69
  70 /* Set the error handler */
  71 objc_error_handler
  72 objc_set_error_handler (objc_error_handler func)
  73 {
  74   objc_error_handler temp = _objc_error_handler;
  75   _objc_error_handler = func;
  76   return temp;
  77 }
  78
  79 /*
  80 ** Standard functions for memory allocation and disposal.
  81 ** Users should use these functions in their ObjC programs so
  82 ** that they work properly with garbage collectors as well as
  83 ** can take advantage of the exception/error handling available.
  84 */
  85
  86 void *
  87 objc_malloc (size_t size)
  88 {
  89   void *res = (void *) (*_objc_malloc) (size);
  90   if (! res)
  91     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
  92   return res;
  93 }
  94
  95 void *
  96 objc_atomic_malloc (size_t size)
  97 {
  98   void *res = (void *) (*_objc_atomic_malloc) (size);
  99   if (! res)
 100     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 101   return res;
 102 }
 103
 104 void *
 105 objc_valloc (size_t size)
 106 {
 107   void *res = (void *) (*_objc_valloc) (size);
 108   if (! res)
 109     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 110   return res;
 111 }
 112
 113 void *
 114 objc_realloc (void *mem, size_t size)
 115 {
 116   void *res = (void *) (*_objc_realloc) (mem, size);
 117   if (! res)
 118     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 119   return res;
 120 }
 121
 122 void *
 123 objc_calloc (size_t nelem, size_t size)
 124 {
 125   void *res = (void *) (*_objc_calloc) (nelem, size);
 126   if (! res)
 127     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted\n");
 128   return res;
 129 }
 130
 131 void
 132 objc_free (void *mem)
 133 {
 134   (*_objc_free) (mem);
 135 }
 136
 137 /*
 138 ** Hook functions for memory allocation and disposal.
 139 ** This makes it easy to substitute garbage collection systems
 140 ** such as Boehm's GC by assigning these function pointers
 141 ** to the GC's allocation routines.  By default these point
 142 ** to the ANSI standard malloc, realloc, free, etc.
 143 **
 144 ** Users should call the normal objc routines above for
 145 ** memory allocation and disposal within their programs.
 146 */
 147
 148 #if OBJC_WITH_GC
 149 #include <gc.h>
 150
 151 static void *
 152 GC_calloc (size_t nelem, size_t size)
 153 {
 154   void *p = GC_malloc (nelem * size);
 155   if (! p)
 156     objc_error (nil, OBJC_ERR_MEMORY, "Virtual memory exhausted!\n");
 157
 158   memset (p, 0, nelem * size);
 159   return p;
 160 }
 161
 162 static void
 163 noFree (void *p)
 164 {
 165 }
 166
 167 void *(*_objc_malloc) (size_t) = GC_malloc;
 168 void *(*_objc_atomic_malloc) (size_t) = GC_malloc_atomic;
 169 void *(*_objc_valloc) (size_t) = GC_malloc;
 170 void *(*_objc_realloc) (void *, size_t) = GC_realloc;
 171 void *(*_objc_calloc) (size_t, size_t) = GC_calloc;
 172 void (*_objc_free) (void *) = noFree;
 173
 174 #else   /* !OBJC_WITH_GC */
 175
 176 void *(*_objc_malloc) (size_t) = malloc;
 177 void *(*_objc_atomic_malloc) (size_t) = malloc;
 178 void *(*_objc_valloc) (size_t) = malloc;
 179 void *(*_objc_realloc) (void *, size_t) = realloc;
 180 void *(*_objc_calloc) (size_t, size_t) = calloc;
 181 void (*_objc_free) (void *) = free;
 182
 183
 184 #endif  /* !OBJC_WITH_GC */