dfg/DFGDesiredWriteBarriers.h

   1 /*
   2  * Copyright (C) 2013, 2014 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. AND ITS CONTRIBUTORS ``AS IS''
  14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  23  * THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #ifndef DFGDesiredWriteBarriers_h
  27 #define DFGDesiredWriteBarriers_h
  28
  29 #include "WriteBarrier.h"
  30 #include <wtf/Vector.h>
  31
  32 #if ENABLE(DFG_JIT)
  33
  34 namespace JSC {
  35
  36 class JSFunction;
  37 class ScriptExecutable;
  38 class SlotVisitor;
  39 class VM;
  40 struct InlineCallFrame;
  41
  42 namespace DFG {
  43
  44 class DesiredWriteBarrier {
  45 public:
  46     enum Type {
  47         ConstantType,
  48         InlineCallFrameExecutableType,
  49     };
  50     DesiredWriteBarrier(Type, CodeBlock*, unsigned index, JSCell* owner);
  51     DesiredWriteBarrier(Type, CodeBlock*, InlineCallFrame*, JSCell* owner);
  52
  53     void trigger(VM&);
  54
  55     void visitChildren(SlotVisitor&);
  56
  57 private:
  58     JSCell* m_owner;
  59     Type m_type;
  60     CodeBlock* m_codeBlock;
  61     union {
  62         unsigned index;
  63         InlineCallFrame* inlineCallFrame;
  64     } m_which;
  65 };
  66
  67 class DesiredWriteBarriers {
  68 public:
  69     DesiredWriteBarriers();
  70     ~DesiredWriteBarriers();
  71
  72     DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, unsigned index, JSCell* owner)
  73     {
  74         m_barriers.append(DesiredWriteBarrier(type, codeBlock, index, owner));
  75         return m_barriers.last();
  76     }
  77     DesiredWriteBarrier& add(DesiredWriteBarrier::Type type, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner)
  78     {
  79         m_barriers.append(DesiredWriteBarrier(type, codeBlock, inlineCallFrame, owner));
  80         return m_barriers.last();
  81     }
  82
  83     void trigger(VM&);
  84
  85     void visitChildren(SlotVisitor&);
  86
  87 private:
  88     Vector<DesiredWriteBarrier> m_barriers;
  89 };
  90
  91 inline void initializeLazyWriteBarrierForInlineCallFrameExecutable(DesiredWriteBarriers& barriers, WriteBarrier<ScriptExecutable>& barrier, CodeBlock* codeBlock, InlineCallFrame* inlineCallFrame, JSCell* owner, ScriptExecutable* value)
  92 {
  93     DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::InlineCallFrameExecutableType, codeBlock, inlineCallFrame, owner);
  94     barrier = WriteBarrier<ScriptExecutable>(desiredBarrier, value);
  95 }
  96
  97 inline void initializeLazyWriteBarrierForConstant(DesiredWriteBarriers& barriers, WriteBarrier<Unknown>& barrier, CodeBlock* codeBlock, unsigned index, JSCell* owner, JSValue value)
  98 {
  99     DesiredWriteBarrier& desiredBarrier = barriers.add(DesiredWriteBarrier::ConstantType, codeBlock, index, owner);
 100     barrier = WriteBarrier<Unknown>(desiredBarrier, value);
 101 }
 102
 103 } } // namespace JSC::DFG
 104
 105 #endif // ENABLE(DFG_JIT)
 106
 107 #endif // DFGDesiredWriteBarriers_h