unit-tests/test-cases/interpose-shared-cache/mymalloc.c

   1 /*
   2  * Copyright (c) 2005-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #include <stdlib.h>
  25 #include <stdint.h>
  26 #include <string.h>
  27 #include <stdbool.h>
  28 #include <mach-o/dyld-interposing.h>
  29 #include <malloc/malloc.h>
  30
  31 static void* seenAllocations[128];
  32 static int seenAllocationIndex = 0;
  33
  34 // record each malloc result in a ring buffer
  35 void* my_malloc(size_t size)
  36 {
  37         char* x = malloc(size);
  38         seenAllocations[seenAllocationIndex++] = x;
  39         seenAllocationIndex = (seenAllocationIndex & 127); //wrap around
  40         return x;
  41 }
  42
  43 DYLD_INTERPOSE(my_malloc, malloc)
  44
  45 bool allocationSeen(void* p)
  46 {
  47         for(int i=0; i < 127; ++i) {
  48                 if ( seenAllocations[i] == p )
  49                         return true;
  50         }
  51         return false;
  52 }
  53
  54
  55