+void system_free( void * ptr ){
+ static void (*freep)(void *);
+ char *error;
+
+ /* get address of libc free */
+ if (!freep) {
+ freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ freep(ptr);
+}
+
+/** Non-snapshotting free for our use. */
+void model_free(void *ptr) {
+#if USE_MPROTECT_SNAPSHOT
+ static void (*freep)(void *);
+ char *error;
+
+ /* get address of libc free */
+ if (!freep) {
+ freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
+ if ((error = dlerror()) != NULL) {
+ fputs(error, stderr);
+ exit(EXIT_FAILURE);
+ }
+ }
+ freep(ptr);
+#else
+ mspace_free( sStaticSpace, ptr );
+#endif
+}
+
+
+/** @brief Global mspace reference for the snapshotting heap */
+mspace mySpace = NULL;
+
+/** @brief Global reference to the unaligned memory address that was malloc'd
+ * for the snapshotting heap */
+void *basemySpace = NULL;
+
+/** Bootstrap allocation. Problem is that the dynamic linker calls
+ * require calloc to work and calloc requires the dynamic linker to
+ * work. */
+
+#define BOOTSTRAPBYTES 4096
+char bootstrapmemory[BOOTSTRAPBYTES];
+size_t offset=0;
+
+void * HandleEarlyAllocationRequest( size_t sz ){
+ /*Align to 8 byte boundary*/
+ sz=(sz+7)&~7;
+
+ if (sz > (BOOTSTRAPBYTES-offset)) {
+ printf("OUT OF BOOTSTRAP MEMORY\n");
+ exit(EXIT_FAILURE);
+ }
+
+ void * pointer= (void *) & bootstrapmemory[offset];
+ offset+=sz;
+ return pointer;
+}
+
+/** Check whether this is bootstrapped memory that we should not
+ free. */
+
+bool DontFree( void * ptr ){
+ return (ptr>=(&bootstrapmemory[0])&&ptr<(&bootstrapmemory[BOOTSTRAPBYTES]));
+}
+
+/** @brief Snapshotting malloc implementation for user programs */
+void *malloc( size_t size )
+{
+ if (mySpace) {
+ void *tmp=mspace_malloc( mySpace, size );
+ ASSERT(tmp);
+ return tmp;
+ } else
+ return HandleEarlyAllocationRequest( size );
+}
+
+/** @brief Snapshotting free implementation for user programs */