*** old/src/share/vm/memory/heap.hpp	Tue Feb  4 16:00:32 2014
--- new/src/share/vm/memory/heap.hpp	Tue Feb  4 16:00:31 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