macosx-10.10.1/libauto-186/Subzone.h

52     // A subzone is a region in vm memory managed by automatic garbage collection.  The base address of the subheap is
55     // A C++ Subzone object is constructed at this aligned address.  The first chunk of memory are the write-barrier cards
80         void           *_allocation_address; // base address for allocations
257                 void *address = quantum_address(_in_use);
258                 return Range(align_up(address, page_size_log2), align_down(displace(address, size), page_size_log2));
275         // Return the subzone of an arbitrary memory address.
277         static inline Subzone *subzone(void *address) { return (Subzone *)((uintptr_t)address & ~mask(subzone_quantum_log2)); }
299         // Return the first allocation address in the subzone.
307         // Return the last allocation address in the subzone.
362         inline usword_t quantum_index(void *address, usword_t quantum_log2) const {
364             usword_t result = (((uintptr_t)address & mask(subzone_quantum_log2)) >> quantum_log2) - base_data_quantum_count(quantum_log2);
370         inline usword_t quantum_index(void *address) const {
371             return is_small() ? quantum_index(address, allocate_quantum_small_log2) :
372                                 quantum_index(address, allocate_quantum_medium_log2);
379         // Returns a quantum index for a arbitrary pointer.  Might be bogus if the address is in the admin (writebarrier) area.
381         inline usword_t quantum_index_unchecked(void *address, usword_t quantum_log2) const {
383             return (((uintptr_t)address & mask(subzone_quantum_log2)) >> quantum_log2) - base_data_quantum_count(quantum_log2);
385         inline usword_t quantum_index_unchecked(void *address) const {
386             return is_small() ? quantum_index_unchecked(address, allocate_quantum_small_log2) :
387                                 quantum_index_unchecked(address, allocate_quantum_medium_log2);
433         // Returns the address if a specified quantum.
454         inline bool block_is_start(void *address, usword_t *q)    const {
455             return (is_small() ? is_bit_aligned(address, allocate_quantum_small_log2) :
456                                  is_bit_aligned(address, allocate_quantum_medium_log2)) &&
457                    block_is_start(*q = quantum_index_unchecked(address));
488         inline usword_t sideData(void *address) const { return _side_data[quantum_index(address)]; }
668         // Return the start address for the given address.
671         inline void * block_start(void *address, usword_t &startq) const {
672             usword_t q = quantum_index_unchecked(address), s = q;
673             // an arbitrary address in our admin area will return a neg (very large) number
861         SubzoneRangeIterator(void *address, const usword_t size) : Range(address, size) {}
862         SubzoneRangeIterator(void *address, void *end) : Range(address, end) {}
871         inline boolean_t iteration_complete() { return !(address() < end()); }
880             if (address() < end()) {
882                 Subzone *subzone = (Subzone *)address();
899             if (end() > address()) {