heap/ConservativeRoots.h

   1 /*
   2  * Copyright (C) 2009 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef ConservativeRoots_h
  27 #define ConservativeRoots_h
  28
  29 #include "Heap.h"
  30 #include <wtf/OSAllocator.h>
  31 #include <wtf/Vector.h>
  32
  33 namespace JSC {
  34
  35 class JSCell;
  36 class DFGCodeBlocks;
  37 class Heap;
  38
  39 class ConservativeRoots {
  40 public:
  41     ConservativeRoots(const MarkedBlockSet*, CopiedSpace*);
  42     ~ConservativeRoots();
  43
  44     void add(void* begin, void* end);
  45     void add(void* begin, void* end, DFGCodeBlocks&);
  46
  47     size_t size();
  48     JSCell** roots();
  49
  50 private:
  51     static const size_t inlineCapacity = 128;
  52     static const size_t nonInlineCapacity = 8192 / sizeof(JSCell*);
  53
  54     template<typename MarkHook>
  55     void genericAddPointer(void*, TinyBloomFilter, MarkHook&);
  56
  57     template<typename MarkHook>
  58     void genericAddSpan(void*, void* end, MarkHook&);
  59
  60     void grow();
  61
  62     JSCell** m_roots;
  63     size_t m_size;
  64     size_t m_capacity;
  65     const MarkedBlockSet* m_blocks;
  66     CopiedSpace* m_copiedSpace;
  67     JSCell* m_inlineRoots[inlineCapacity];
  68 };
  69
  70 inline size_t ConservativeRoots::size()
  71 {
  72     return m_size;
  73 }
  74
  75 inline JSCell** ConservativeRoots::roots()
  76 {
  77     return m_roots;
  78 }
  79
  80 } // namespace JSC
  81
  82 #endif // ConservativeRoots_h