10 #include "snapshotimp.h"
13 #define REQUESTS_BEFORE_ALLOC 1024
15 size_t allocatedReqs[REQUESTS_BEFORE_ALLOC] = { 0 };
18 #if !USE_MPROTECT_SNAPSHOT
19 static mspace sStaticSpace = NULL;
22 /** Non-snapshotting calloc for our use. */
23 void *model_calloc(size_t count, size_t size)
25 #if USE_MPROTECT_SNAPSHOT
26 static void *(*callocp)(size_t count, size_t size) = NULL;
30 /* get address of libc malloc */
32 callocp = (void * (*)(size_t, size_t))dlsym(RTLD_NEXT, "calloc");
33 if ((error = dlerror()) != NULL) {
38 ptr = callocp(count, size);
44 sStaticSpace = create_mspace_with_base((void *)(snapshotrecord->mSharedMemoryBase), SHARED_MEMORY_DEFAULT - sizeof(struct SnapShot), 1);
45 return mspace_calloc(sStaticSpace, count, size);
49 /** Non-snapshotting malloc for our use. */
50 void *model_malloc(size_t size)
52 #if USE_MPROTECT_SNAPSHOT
53 static void *(*mallocp)(size_t size) = NULL;
57 /* get address of libc malloc */
59 mallocp = (void * (*)(size_t))dlsym(RTLD_NEXT, "malloc");
60 if ((error = dlerror()) != NULL) {
71 sStaticSpace = create_mspace_with_base((void *)(snapshotrecord->mSharedMemoryBase), SHARED_MEMORY_DEFAULT - sizeof(struct SnapShot), 1);
72 return mspace_malloc(sStaticSpace, size);
76 /** @brief Snapshotting malloc, for use by model-checker (not user progs) */
77 void * snapshot_malloc(size_t size)
79 void *tmp = mspace_malloc(model_snapshot_space, size);
84 /** @brief Snapshotting calloc, for use by model-checker (not user progs) */
85 void * snapshot_calloc(size_t count, size_t size)
87 void *tmp = mspace_calloc(model_snapshot_space, count, size);
92 /** @brief Snapshotting realloc, for use by model-checker (not user progs) */
93 void *snapshot_realloc(void *ptr, size_t size)
95 void *tmp = mspace_realloc(model_snapshot_space, ptr, size);
100 /** @brief Snapshotting free, for use by model-checker (not user progs) */
101 void snapshot_free(void *ptr)
103 mspace_free(model_snapshot_space, ptr);
106 /** Non-snapshotting free for our use. */
107 void model_free(void *ptr)
109 #if USE_MPROTECT_SNAPSHOT
110 static void (*freep)(void *);
113 /* get address of libc free */
115 freep = (void (*)(void *))dlsym(RTLD_NEXT, "free");
116 if ((error = dlerror()) != NULL) {
117 fputs(error, stderr);
123 mspace_free(sStaticSpace, ptr);
127 /** Bootstrap allocation. Problem is that the dynamic linker calls require
128 * calloc to work and calloc requires the dynamic linker to work. */
130 #define BOOTSTRAPBYTES 4096
131 char bootstrapmemory[BOOTSTRAPBYTES];
134 void * HandleEarlyAllocationRequest(size_t sz)
136 /* Align to 8 byte boundary */
139 if (sz > (BOOTSTRAPBYTES-offset)) {
140 model_print("OUT OF BOOTSTRAP MEMORY\n");
144 void *pointer = (void *)&bootstrapmemory[offset];
149 /** @brief Global mspace reference for the model-checker's snapshotting heap */
150 mspace model_snapshot_space = NULL;
152 #if USE_MPROTECT_SNAPSHOT
154 /** @brief Global mspace reference for the user's snapshotting heap */
155 mspace user_snapshot_space = NULL;
157 /** Check whether this is bootstrapped memory that we should not free */
158 static bool DontFree(void *ptr)
160 return (ptr >= (&bootstrapmemory[0]) && ptr < (&bootstrapmemory[BOOTSTRAPBYTES]));
163 /** @brief Snapshotting malloc implementation for user programs */
164 void *malloc(size_t size)
166 if (user_snapshot_space) {
167 void *tmp = mspace_malloc(user_snapshot_space, size);
171 return HandleEarlyAllocationRequest(size);
174 /** @brief Snapshotting free implementation for user programs */
175 void free(void * ptr)
178 mspace_free(user_snapshot_space, ptr);
181 /** @brief Snapshotting realloc implementation for user programs */
182 void *realloc(void *ptr, size_t size)
184 void *tmp = mspace_realloc(user_snapshot_space, ptr, size);
189 /** @brief Snapshotting calloc implementation for user programs */
190 void * calloc(size_t num, size_t size)
192 if (user_snapshot_space) {
193 void *tmp = mspace_calloc(user_snapshot_space, num, size);
197 void *tmp = HandleEarlyAllocationRequest(size * num);
198 memset(tmp, 0, size * num);
203 /** @brief Snapshotting new operator for user programs */
204 void * operator new(size_t size) throw(std::bad_alloc)
209 /** @brief Snapshotting delete operator for user programs */
210 void operator delete(void *p) throw()
215 /** @brief Snapshotting new[] operator for user programs */
216 void * operator new[](size_t size) throw(std::bad_alloc)
221 /** @brief Snapshotting delete[] operator for user programs */
222 void operator delete[](void *p, size_t size)
226 #endif /* USE_MPROTECT_SNAPSHOT */