3 #include "snapshotimp.h"
9 #define REQUESTS_BEFORE_ALLOC 1024
10 size_t allocatedReqs[ REQUESTS_BEFORE_ALLOC ] = { 0 };
13 #if !USE_MPROTECT_SNAPSHOT
14 static mspace sStaticSpace = NULL;
17 /** Non-snapshotting calloc for our use. */
18 void *model_calloc(size_t count, size_t size) {
19 #if USE_MPROTECT_SNAPSHOT
20 static void *(*callocp)(size_t count, size_t size)=NULL;
24 /* get address of libc malloc */
26 callocp = ( void * ( * )( size_t, size_t ) )dlsym(RTLD_NEXT, "calloc");
27 if ((error = dlerror()) != NULL) {
32 ptr = callocp(count, size);
35 if( !snapshotrecord) {
38 if( NULL == sStaticSpace )
39 sStaticSpace = create_mspace_with_base( ( void * )( snapshotrecord->mSharedMemoryBase ), SHARED_MEMORY_DEFAULT -sizeof( struct SnapShot ), 1 );
40 return mspace_calloc( sStaticSpace, count, size );
44 /** Non-snapshotting malloc for our use. */
45 void *model_malloc(size_t size) {
46 #if USE_MPROTECT_SNAPSHOT
47 static void *(*mallocp)(size_t size)=NULL;
51 /* get address of libc malloc */
53 mallocp = ( void * ( * )( size_t ) )dlsym(RTLD_NEXT, "malloc");
54 if ((error = dlerror()) != NULL) {
62 if( !snapshotrecord) {
65 if( NULL == sStaticSpace )
66 sStaticSpace = create_mspace_with_base( ( void * )( snapshotrecord->mSharedMemoryBase ), SHARED_MEMORY_DEFAULT -sizeof( struct SnapShot ), 1 );
67 return mspace_malloc( sStaticSpace, size );
71 /** @brief Snapshotting malloc, for use by model-checker (not user progs) */
72 void * snapshot_malloc(size_t size)
77 /** @brief Snapshotting calloc, for use by model-checker (not user progs) */
78 void * snapshot_calloc(size_t count, size_t size)
80 return calloc(count, size);
83 /** @brief Snapshotting free, for use by model-checker (not user progs) */
84 void snapshot_free(void *ptr)
89 void *system_malloc( size_t size ){
90 static void *(*mallocp)(size_t size);
94 /* get address of libc malloc */
96 mallocp = ( void * ( * )( size_t ) )dlsym(RTLD_NEXT, "malloc");
97 if ((error = dlerror()) != NULL) {
106 void system_free( void * ptr ){
107 static void (*freep)(void *);
110 /* get address of libc free */
112 freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
113 if ((error = dlerror()) != NULL) {
114 fputs(error, stderr);
121 /** Non-snapshotting free for our use. */
122 void model_free(void *ptr) {
123 #if USE_MPROTECT_SNAPSHOT
124 static void (*freep)(void *);
127 /* get address of libc free */
129 freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
130 if ((error = dlerror()) != NULL) {
131 fputs(error, stderr);
137 mspace_free( sStaticSpace, ptr );
142 /** This global references the mspace for the snapshotting heap */
143 mspace mySpace = NULL;
145 /** This global references the unaligned memory address that was malloced for the snapshotting heap */
146 void * basemySpace = NULL;
148 /** Bootstrap allocation. Problem is that the dynamic linker calls
149 * require calloc to work and calloc requires the dynamic linker to
152 #define BOOTSTRAPBYTES 4096
153 char bootstrapmemory[BOOTSTRAPBYTES];
156 void * HandleEarlyAllocationRequest( size_t sz ){
157 /*Align to 8 byte boundary*/
160 if (sz > (BOOTSTRAPBYTES-offset)) {
161 printf("OUT OF BOOTSTRAP MEMORY\n");
165 void * pointer= (void *) & bootstrapmemory[offset];
170 /** Check whether this is bootstrapped memory that we should not
173 bool DontFree( void * ptr ){
174 return (ptr>=(&bootstrapmemory[0])&&ptr<(&bootstrapmemory[BOOTSTRAPBYTES]));
177 /** Snapshotting malloc implementation for user programs. */
178 void *malloc( size_t size ) {
180 void *tmp=mspace_malloc( mySpace, size );
184 return HandleEarlyAllocationRequest( size );
187 /** Snapshotting free implementation for user programs. */
188 void free( void * ptr ){
189 if( DontFree( ptr ) ) return;
190 mspace_free( mySpace, ptr );
193 /** Snapshotting realloc implementation for user programs. */
194 void *realloc( void *ptr, size_t size ){
195 void *tmp=mspace_realloc( mySpace, ptr, size );
200 /** Snapshotting calloc implementation for user programs. */
201 void * calloc( size_t num, size_t size ){
203 void *tmp=mspace_calloc( mySpace, num, size );
207 void *tmp=HandleEarlyAllocationRequest( size * num );
208 std::memset( tmp, 0, size * num );
213 /** Snapshotting new operator for user programs. */
214 void * operator new(size_t size) throw(std::bad_alloc) {
218 /** Snapshotting delete operator for user programs. */
219 void operator delete(void *p) throw() {
223 /** Snapshotting new[] operator for user programs. */
224 void * operator new[](size_t size) throw(std::bad_alloc) {
228 /** Snapshotting delete[] operator for user programs. */
229 void operator delete[](void *p, size_t size) {