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);
42 sStaticSpace = create_shared_mspace();
43 return mspace_calloc(sStaticSpace, count, size);
47 /** Non-snapshotting malloc for our use. */
48 void *model_malloc(size_t size)
50 #if USE_MPROTECT_SNAPSHOT
51 static void *(*mallocp)(size_t size) = NULL;
55 /* get address of libc malloc */
57 mallocp = (void * (*)(size_t))dlsym(RTLD_NEXT, "malloc");
58 if ((error = dlerror()) != NULL) {
67 sStaticSpace = create_shared_mspace();
68 return mspace_malloc(sStaticSpace, size);
72 /** @brief Snapshotting malloc, for use by model-checker (not user progs) */
73 void * snapshot_malloc(size_t size)
75 void *tmp = mspace_malloc(model_snapshot_space, size);
80 /** @brief Snapshotting calloc, for use by model-checker (not user progs) */
81 void * snapshot_calloc(size_t count, size_t size)
83 void *tmp = mspace_calloc(model_snapshot_space, count, size);
88 /** @brief Snapshotting realloc, for use by model-checker (not user progs) */
89 void *snapshot_realloc(void *ptr, size_t size)
91 void *tmp = mspace_realloc(model_snapshot_space, ptr, size);
96 /** @brief Snapshotting free, for use by model-checker (not user progs) */
97 void snapshot_free(void *ptr)
99 mspace_free(model_snapshot_space, ptr);
102 /** Non-snapshotting free for our use. */
103 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);
123 /** Bootstrap allocation. Problem is that the dynamic linker calls require
124 * calloc to work and calloc requires the dynamic linker to work. */
126 #define BOOTSTRAPBYTES 4096
127 char bootstrapmemory[BOOTSTRAPBYTES];
130 void * HandleEarlyAllocationRequest(size_t sz)
132 /* Align to 8 byte boundary */
135 if (sz > (BOOTSTRAPBYTES-offset)) {
136 model_print("OUT OF BOOTSTRAP MEMORY\n");
140 void *pointer = (void *)&bootstrapmemory[offset];
145 /** @brief Global mspace reference for the model-checker's snapshotting heap */
146 mspace model_snapshot_space = NULL;
148 #if USE_MPROTECT_SNAPSHOT
150 /** @brief Global mspace reference for the user's snapshotting heap */
151 mspace user_snapshot_space = NULL;
153 /** Check whether this is bootstrapped memory that we should not free */
154 static bool DontFree(void *ptr)
156 return (ptr >= (&bootstrapmemory[0]) && ptr < (&bootstrapmemory[BOOTSTRAPBYTES]));
159 /** @brief Snapshotting malloc implementation for user programs */
160 void *malloc(size_t size)
162 if (user_snapshot_space) {
163 void *tmp = mspace_malloc(user_snapshot_space, size);
167 return HandleEarlyAllocationRequest(size);
170 /** @brief Snapshotting free implementation for user programs */
171 void free(void * ptr)
174 mspace_free(user_snapshot_space, ptr);
177 /** @brief Snapshotting realloc implementation for user programs */
178 void *realloc(void *ptr, size_t size)
180 void *tmp = mspace_realloc(user_snapshot_space, ptr, size);
185 /** @brief Snapshotting calloc implementation for user programs */
186 void * calloc(size_t num, size_t size)
188 if (user_snapshot_space) {
189 void *tmp = mspace_calloc(user_snapshot_space, num, size);
193 void *tmp = HandleEarlyAllocationRequest(size * num);
194 memset(tmp, 0, size * num);
199 /** @brief Snapshotting new operator for user programs */
200 void * operator new(size_t size) throw(std::bad_alloc)
205 /** @brief Snapshotting delete operator for user programs */
206 void operator delete(void *p) throw()
211 /** @brief Snapshotting new[] operator for user programs */
212 void * operator new[](size_t size) throw(std::bad_alloc)
217 /** @brief Snapshotting delete[] operator for user programs */
218 void operator delete[](void *p, size_t size)
222 #endif /* USE_MPROTECT_SNAPSHOT */