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 void *system_malloc( size_t size ){
72 static void *(*mallocp)(size_t size);
76 /* get address of libc malloc */
78 mallocp = ( void * ( * )( size_t ) )dlsym(RTLD_NEXT, "malloc");
79 if ((error = dlerror()) != NULL) {
88 void system_free( void * ptr ){
89 static void (*freep)(void *);
92 /* get address of libc free */
94 freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
95 if ((error = dlerror()) != NULL) {
103 /** Non-snapshotting free for our use. */
104 void model_free(void *ptr) {
105 #if USE_MPROTECT_SNAPSHOT
106 static void (*freep)(void *);
109 /* get address of libc free */
111 freep = ( void ( * )( void * ) )dlsym(RTLD_NEXT, "free");
112 if ((error = dlerror()) != NULL) {
113 fputs(error, stderr);
119 mspace_free( sStaticSpace, ptr );
124 /** This global references the mspace for the snapshotting heap */
125 mspace mySpace = NULL;
127 /** This global references the unaligned memory address that was malloced for the snapshotting heap */
128 void * basemySpace = NULL;
130 /** Bootstrap allocation. Problem is that the dynamic linker calls
131 * require calloc to work and calloc requires the dynamic linker to
134 #define BOOTSTRAPBYTES 4096
135 char bootstrapmemory[BOOTSTRAPBYTES];
138 void * HandleEarlyAllocationRequest( size_t sz ){
139 /*Align to 8 byte boundary*/
142 if (sz > (BOOTSTRAPBYTES-offset)) {
143 printf("OUT OF BOOTSTRAP MEMORY\n");
147 void * pointer= (void *) & bootstrapmemory[offset];
152 /** Check whether this is bootstrapped memory that we should not
155 bool DontFree( void * ptr ){
156 return (ptr>=(&bootstrapmemory[0])&&ptr<(&bootstrapmemory[BOOTSTRAPBYTES]));
159 /** Snapshotting malloc implementation for user programs. */
160 void *malloc( size_t size ) {
162 void *tmp=mspace_malloc( mySpace, size );
166 return HandleEarlyAllocationRequest( size );
169 /** Snapshotting free implementation for user programs. */
170 void free( void * ptr ){
171 if( DontFree( ptr ) ) return;
172 mspace_free( mySpace, ptr );
175 /** Snapshotting realloc implementation for user programs. */
176 void *realloc( void *ptr, size_t size ){
177 void *tmp=mspace_realloc( mySpace, ptr, size );
182 /** Snapshotting calloc implementation for user programs. */
183 void * calloc( size_t num, size_t size ){
185 void *tmp=mspace_calloc( mySpace, num, size );
189 void *tmp=HandleEarlyAllocationRequest( size * num );
190 std::memset( tmp, 0, size * num );
195 /** Snapshotting new operator for user programs. */
196 void * operator new(size_t size) throw(std::bad_alloc) {
200 /** Snapshotting delete operator for user programs. */
201 void operator delete(void *p) throw() {
205 /** Snapshotting new[] operator for user programs. */
206 void * operator new[](size_t size) throw(std::bad_alloc) {
210 /** Snapshotting delete[] operator for user programs. */
211 void operator delete[](void *p, size_t size) {