hotspot/src/share/vm/memory/heap.hpp
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8025856: Fix typos in the GC code Summary: Fix about 440 typos in comments in the VM code Reviewed-by: mgerdin, tschatzl, coleenp, kmo, jcoomes
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/*
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 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#ifndef SHARE_VM_MEMORY_HEAP_HPP
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#define SHARE_VM_MEMORY_HEAP_HPP
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#include "memory/allocation.hpp"
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#include "runtime/virtualspace.hpp"
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// Blocks
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class HeapBlock VALUE_OBJ_CLASS_SPEC {
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  friend class VMStructs;
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 public:
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  struct Header {
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    size_t  _length;                             // the length in segments
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    bool    _used;                               // Used bit
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  };
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 protected:
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  union {
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    Header _header;
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    int64_t _padding[ (sizeof(Header) + sizeof(int64_t)-1) / sizeof(int64_t) ];
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                        // pad to 0 mod 8
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  };
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  // Initialization
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  void initialize(size_t length)                 { _header._length = length; set_used(); }
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  // Accessors
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  void* allocated_space() const                  { return (void*)(this + 1); }
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  size_t length() const                          { return _header._length; }
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  // Used/free
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  void set_used()                                { _header._used = true; }
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  void set_free()                                { _header._used = false; }
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  bool free()                                    { return !_header._used; }
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};
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class FreeBlock: public HeapBlock {
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  friend class VMStructs;
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 protected:
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  FreeBlock* _link;
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  // Initialization
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  void initialize(size_t length)             { HeapBlock::initialize(length); _link= NULL; }
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  // Merging
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  void set_length(size_t l)                  { _header._length = l; }
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  // Accessors
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  FreeBlock* link() const                    { return _link; }
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  void set_link(FreeBlock* link)             { _link = link; }
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};
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class CodeHeap : public CHeapObj<mtCode> {
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  friend class VMStructs;
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  VirtualSpace _memory;                          // the memory holding the blocks
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  VirtualSpace _segmap;                          // the memory holding the segment map
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  size_t       _number_of_committed_segments;
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  size_t       _number_of_reserved_segments;
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  size_t       _segment_size;
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  int          _log2_segment_size;
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  size_t       _next_segment;
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  FreeBlock*   _freelist;
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  size_t       _freelist_segments;               // No. of segments in freelist
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  // Helper functions
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  size_t   size_to_segments(size_t size) const { return (size + _segment_size - 1) >> _log2_segment_size; }
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  size_t   segments_to_size(size_t number_of_segments) const { return number_of_segments << _log2_segment_size; }
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  size_t   segment_for(void* p) const            { return ((char*)p - _memory.low()) >> _log2_segment_size; }
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  HeapBlock* block_at(size_t i) const            { return (HeapBlock*)(_memory.low() + (i << _log2_segment_size)); }
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  void  mark_segmap_as_free(size_t beg, size_t end);
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  void  mark_segmap_as_used(size_t beg, size_t end);
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  // Freelist management helpers
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  FreeBlock* following_block(FreeBlock *b);
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  void insert_after(FreeBlock* a, FreeBlock* b);
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  void merge_right (FreeBlock* a);
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  // Toplevel freelist management
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  void add_to_freelist(HeapBlock *b);
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  FreeBlock* search_freelist(size_t length, bool is_critical);
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  // Iteration helpers
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  void*      next_free(HeapBlock* b) const;
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  HeapBlock* first_block() const;
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  HeapBlock* next_block(HeapBlock* b) const;
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  HeapBlock* block_start(void* p) const;
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  // to perform additional actions on creation of executable code
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  void on_code_mapping(char* base, size_t size);
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  CodeHeap();
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  // Heap extents
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  bool  reserve(size_t reserved_size, size_t committed_size, size_t segment_size);
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  void  release();                               // releases all allocated memory
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  bool  expand_by(size_t size);                  // expands committed memory by size
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  void  shrink_by(size_t size);                  // shrinks committed memory by size
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  void  clear();                                 // clears all heap contents
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  // Memory allocation
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  void* allocate  (size_t size, bool is_critical);  // allocates a block of size or returns NULL
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  void  deallocate(void* p);                     // deallocates a block
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  // Attributes
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  char* low_boundary() const                     { return _memory.low_boundary (); }
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  char* high() const                             { return _memory.high(); }
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  char* high_boundary() const                    { return _memory.high_boundary(); }
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  bool  contains(const void* p) const            { return low_boundary() <= p && p < high(); }
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  void* find_start(void* p) const;              // returns the block containing p or NULL
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  size_t alignment_unit() const;                // alignment of any block
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  size_t alignment_offset() const;              // offset of first byte of any block, within the enclosing alignment unit
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  static size_t header_size();                  // returns the header size for each heap block
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  // Iteration
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  // returns the first block or NULL
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  void* first() const       { return next_free(first_block()); }
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  // returns the next block given a block p or NULL
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  void* next(void* p) const { return next_free(next_block(block_start(p))); }
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  // Statistics
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  size_t capacity() const;
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  size_t max_capacity() const;
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  size_t allocated_capacity() const;
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  size_t unallocated_capacity() const            { return max_capacity() - allocated_capacity(); }
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private:
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  size_t heap_unallocated_capacity() const;
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  // Debugging
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  void verify();
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  void print()  PRODUCT_RETURN;
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};
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#endif // SHARE_VM_MEMORY_HEAP_HPP