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)
20 #if USE_MPROTECT_SNAPSHOT
21 static void *(*callocp)(size_t count, size_t size) = NULL;
25 /* get address of libc malloc */
27 callocp = (void * (*)(size_t, size_t))dlsym(RTLD_NEXT, "calloc");
28 if ((error = dlerror()) != NULL) {
33 ptr = callocp(count, size);
36 if (!snapshotrecord) {
39 if (NULL == sStaticSpace)
40 sStaticSpace = create_mspace_with_base(( void *)( snapshotrecord->mSharedMemoryBase), SHARED_MEMORY_DEFAULT -sizeof(struct SnapShot), 1);
41 return mspace_calloc(sStaticSpace, count, size);
45 /** Non-snapshotting malloc for our use. */
46 void *model_malloc(size_t size)
48 #if USE_MPROTECT_SNAPSHOT
49 static void *(*mallocp)(size_t size) = NULL;
53 /* get address of libc malloc */
55 mallocp = (void * (*)(size_t))dlsym(RTLD_NEXT, "malloc");
56 if ((error = dlerror()) != NULL) {
64 if (!snapshotrecord) {
67 if (NULL == sStaticSpace)
68 sStaticSpace = create_mspace_with_base(( void *)( snapshotrecord->mSharedMemoryBase), SHARED_MEMORY_DEFAULT -sizeof(struct SnapShot), 1);
69 return mspace_malloc(sStaticSpace, size);
73 /** @brief Snapshotting malloc, for use by model-checker (not user progs) */
74 void * snapshot_malloc(size_t size)
79 /** @brief Snapshotting calloc, for use by model-checker (not user progs) */
80 void * snapshot_calloc(size_t count, size_t size)
82 return calloc(count, size);
85 /** @brief Snapshotting free, for use by model-checker (not user progs) */
86 void snapshot_free(void *ptr)
91 /** Non-snapshotting free for our use. */
92 void model_free(void *ptr)
94 #if USE_MPROTECT_SNAPSHOT
95 static void (*freep)(void *);
98 /* get address of libc free */
100 freep = ( void ( * )( void *))dlsym(RTLD_NEXT, "free");
101 if ((error = dlerror()) != NULL) {
102 fputs(error, stderr);
108 mspace_free(sStaticSpace, ptr);
112 /** Bootstrap allocation. Problem is that the dynamic linker calls
113 * require calloc to work and calloc requires the dynamic linker to
116 #define BOOTSTRAPBYTES 4096
117 char bootstrapmemory[BOOTSTRAPBYTES];
120 void * HandleEarlyAllocationRequest(size_t sz)
122 /* Align to 8 byte boundary */
125 if (sz > (BOOTSTRAPBYTES-offset)) {
126 printf("OUT OF BOOTSTRAP MEMORY\n");
130 void *pointer= (void *)&bootstrapmemory[offset];
135 /** @brief Global mspace reference for the model-checker's snapshotting heap */
136 mspace model_snapshot_space = NULL;
138 #if USE_MPROTECT_SNAPSHOT
140 /** @brief Global mspace reference for the user's snapshotting heap
141 * @todo use this ONLY for user's allocations, not for internal snapshotting
143 mspace user_snapshot_space = NULL;
145 /** Check whether this is bootstrapped memory that we should not free */
146 static bool DontFree(void *ptr)
148 return (ptr >= (&bootstrapmemory[0]) && ptr < (&bootstrapmemory[BOOTSTRAPBYTES]));
151 /** @brief Snapshotting malloc implementation for user programs */
152 void *malloc(size_t size)
154 if (user_snapshot_space) {
155 void *tmp = mspace_malloc(user_snapshot_space, size);
159 return HandleEarlyAllocationRequest(size);
162 /** @brief Snapshotting free implementation for user programs */
163 void free(void * ptr)
166 mspace_free(user_snapshot_space, ptr);
169 /** @brief Snapshotting realloc implementation for user programs */
170 void *realloc(void *ptr, size_t size)
172 void *tmp = mspace_realloc(user_snapshot_space, ptr, size);
177 /** @brief Snapshotting calloc implementation for user programs */
178 void * calloc(size_t num, size_t size)
180 if (user_snapshot_space) {
181 void *tmp = mspace_calloc(user_snapshot_space, num, size);
185 void *tmp = HandleEarlyAllocationRequest(size * num);
186 std::memset(tmp, 0, size * num);
191 /** @brief Snapshotting new operator for user programs */
192 void * operator new(size_t size) throw(std::bad_alloc)
197 /** @brief Snapshotting delete operator for user programs */
198 void operator delete(void *p) throw()
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, size_t size)
214 #endif /* USE_MPROTECT_SNAPSHOT */