2 * @brief Memory allocation functions.
12 /** MEMALLOC declares the allocators for a class to allocate
13 * memory in the non-snapshotting heap. */
15 void * operator new(size_t size) { \
16 return model_malloc(size); \
18 void operator delete(void *p, size_t size) { \
21 void * operator new[](size_t size) { \
22 return model_malloc(size); \
24 void operator delete[](void *p, size_t size) { \
28 /** SNAPSHOTALLOC declares the allocators for a class to allocate
29 * memory in the snapshotting heap. */
30 #define SNAPSHOTALLOC \
31 void * operator new(size_t size) { \
32 return snapshot_malloc(size); \
34 void operator delete(void *p, size_t size) { \
37 void * operator new[](size_t size) { \
38 return snapshot_malloc(size); \
40 void operator delete[](void *p, size_t size) { \
44 void *model_malloc(size_t size);
45 void *model_calloc(size_t count, size_t size);
46 void model_free(void *ptr);
48 void * snapshot_malloc(size_t size);
49 void * snapshot_calloc(size_t count, size_t size);
50 void snapshot_free(void *ptr);
52 void *system_malloc(size_t size );
54 /** @brief Provides a non-snapshotting allocator for use in STL classes.
56 * The code was adapted from a code example from the book The C++
57 * Standard Library - A Tutorial and Reference by Nicolai M. Josuttis,
58 * Addison-Wesley, 1999 © Copyright Nicolai M. Josuttis 1999
59 * Permission to copy, use, modify, sell and distribute this software
60 * is granted provided this copyright notice appears in all copies.
61 * This software is provided "as is" without express or implied
62 * warranty, and with no claim as to its suitability for any purpose.
70 typedef const T* const_pointer;
72 typedef const T& const_reference;
73 typedef size_t size_type;
74 typedef size_t difference_type;
76 // rebind allocator to type U
79 typedef ModelAlloc<U> other;
82 // return address of values
83 pointer address(reference value) const {
86 const_pointer address(const_reference value) const {
90 /* constructors and destructor
91 * - nothing to do because the allocator has no state
93 ModelAlloc() throw() {
95 ModelAlloc(const ModelAlloc&) throw() {
98 ModelAlloc(const ModelAlloc<U>&) throw() {
100 ~ModelAlloc() throw() {
103 // return maximum number of elements that can be allocated
104 size_type max_size() const throw() {
105 return std::numeric_limits<size_t>::max() / sizeof(T);
108 // allocate but don't initialize num elements of type T
109 pointer allocate(size_type num, const void * = 0) {
110 pointer p = (pointer)model_malloc(num * sizeof(T));
114 // initialize elements of allocated storage p with value value
115 void construct(pointer p, const T& value) {
116 // initialize memory with placement new
117 new((void*)p)T(value);
120 // destroy elements of initialized storage p
121 void destroy(pointer p) {
122 // destroy objects by calling their destructor
126 // deallocate storage p of deleted elements
127 void deallocate(pointer p, size_type num) {
128 model_free((void*)p);
132 /** Return that all specializations of this allocator are interchangeable. */
133 template <class T1, class T2>
134 bool operator ==(const ModelAlloc<T1>&,
135 const ModelAlloc<T2>&) throw() {
139 /** Return that all specializations of this allocator are interchangeable. */
140 template <class T1, class T2>
141 bool operator!= (const ModelAlloc<T1>&,
142 const ModelAlloc<T2>&) throw() {
149 typedef void * mspace;
150 extern void* mspace_malloc(mspace msp, size_t bytes);
151 extern void mspace_free(mspace msp, void* mem);
152 extern void* mspace_realloc(mspace msp, void* mem, size_t newsize);
153 extern void* mspace_calloc(mspace msp, size_t n_elements, size_t elem_size);
154 extern mspace create_mspace_with_base(void* base, size_t capacity, int locked);
155 extern mspace create_mspace(size_t capacity, int locked);
157 #if USE_MPROTECT_SNAPSHOT
158 /** @brief mspace for the snapshotting heap */
159 extern mspace snapshot_space;
163 }; /* end of extern "C" */
166 #endif /* _MY_MEMORY_H */