src/share/vm/memory/heap.hpp
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*** old/src/share/vm/memory/heap.hpp	Wed Feb  5 17:12:39 2014
--- new/src/share/vm/memory/heap.hpp	Wed Feb  5 17:12:39 2014

*** 91,137 **** --- 91,139 ---- size_t _next_segment; FreeBlock* _freelist; size_t _freelist_segments; // No. of segments in freelist + enum { free_sentinel = 0xFF }; + // Helper functions size_t size_to_segments(size_t size) const { return (size + _segment_size - 1) >> _log2_segment_size; } size_t segments_to_size(size_t number_of_segments) const { return number_of_segments << _log2_segment_size; } size_t segment_for(void* p) const { return ((char*)p - _memory.low()) >> _log2_segment_size; } + bool is_segment_unused(int val) const { return val == free_sentinel; } HeapBlock* block_at(size_t i) const { return (HeapBlock*)(_memory.low() + (i << _log2_segment_size)); } void mark_segmap_as_free(size_t beg, size_t end); void mark_segmap_as_used(size_t beg, size_t end); // Freelist management helpers ! FreeBlock* following_block(FreeBlock *b); ! FreeBlock* following_block(FreeBlock* b); void insert_after(FreeBlock* a, FreeBlock* b); ! void merge_right (FreeBlock* a); ! bool merge_right (FreeBlock* a); // Toplevel freelist management ! void add_to_freelist(HeapBlock *b); ! void add_to_freelist(HeapBlock* b); FreeBlock* search_freelist(size_t length, bool is_critical); // Iteration helpers void* next_free(HeapBlock* b) const; HeapBlock* first_block() const; HeapBlock* next_block(HeapBlock* b) const; HeapBlock* block_start(void* p) const; // to perform additional actions on creation of executable code void on_code_mapping(char* base, size_t size); + void clear(); // clears all heap contents + public: CodeHeap(); // Heap extents bool reserve(size_t reserved_size, size_t committed_size, size_t segment_size); void release(); // releases all allocated memory bool expand_by(size_t size); // expands commited memory by size void shrink_by(size_t size); // shrinks commited memory by size void clear(); // clears all heap contents + bool expand_by(size_t size); // expands committed memory by size // Memory allocation void* allocate (size_t size, bool is_critical); // allocates a block of size or returns NULL void deallocate(void* p); // deallocates a block
*** 144,154 **** --- 146,156 ---- void* find_start(void* p) const; // returns the block containing p or NULL size_t alignment_unit() const; // alignment of any block size_t alignment_offset() const; // offset of first byte of any block, within the enclosing alignment unit static size_t header_size(); // returns the header size for each heap block // Iteration + size_t allocated_in_freelist() const { return _freelist_segments * CodeCacheSegmentSize; } // returns the first block or NULL void* first() const { return next_free(first_block()); } // returns the next block given a block p or NULL void* next(void* p) const { return next_free(next_block(block_start(p))); }
*** 162,171 **** --- 164,173 ---- private: size_t heap_unallocated_capacity() const; public: // Debugging ! void verify() PRODUCT_RETURN; void print() PRODUCT_RETURN; }; #endif // SHARE_VM_MEMORY_HEAP_HPP

src/share/vm/memory/heap.hpp
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