dfg/DFGMinifiedNode.h

   1 /*
   2  * Copyright (C) 2012 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 DFGMinifiedNode_h
  27 #define DFGMinifiedNode_h
  28
  29 #include <wtf/Platform.h>
  30
  31 #if ENABLE(DFG_JIT)
  32
  33 #include "DFGCommon.h"
  34 #include "DFGMinifiedID.h"
  35 #include "DFGNodeType.h"
  36
  37 namespace JSC { namespace DFG {
  38
  39 struct Node;
  40
  41 inline bool belongsInMinifiedGraph(NodeType type)
  42 {
  43     switch (type) {
  44     case JSConstant:
  45     case WeakJSConstant:
  46     case ValueToInt32:
  47     case Int32ToDouble:
  48     case ForwardInt32ToDouble:
  49     case UInt32ToNumber:
  50     case DoubleAsInt32:
  51     case PhantomArguments:
  52         return true;
  53     default:
  54         return false;
  55     }
  56 }
  57
  58 class MinifiedNode {
  59 public:
  60     MinifiedNode() { }
  61
  62     static MinifiedNode fromNode(Node*);
  63
  64     MinifiedID id() const { return m_id; }
  65     NodeType op() const { return m_op; }
  66
  67     bool hasChild1() const { return hasChild(m_op); }
  68
  69     MinifiedID child1() const
  70     {
  71         ASSERT(hasChild(m_op));
  72         return MinifiedID::fromBits(m_childOrInfo);
  73     }
  74
  75     bool hasConstant() const { return hasConstantNumber() || hasWeakConstant(); }
  76
  77     bool hasConstantNumber() const { return hasConstantNumber(m_op); }
  78
  79     unsigned constantNumber() const
  80     {
  81         ASSERT(hasConstantNumber(m_op));
  82         return m_childOrInfo;
  83     }
  84
  85     bool hasWeakConstant() const { return hasWeakConstant(m_op); }
  86
  87     JSCell* weakConstant() const
  88     {
  89         ASSERT(hasWeakConstant(m_op));
  90         return bitwise_cast<JSCell*>(m_childOrInfo);
  91     }
  92
  93     static MinifiedID getID(MinifiedNode* node) { return node->id(); }
  94     static bool compareByNodeIndex(const MinifiedNode& a, const MinifiedNode& b)
  95     {
  96         return a.m_id < b.m_id;
  97     }
  98
  99 private:
 100     static bool hasChild(NodeType type)
 101     {
 102         switch (type) {
 103         case ValueToInt32:
 104         case Int32ToDouble:
 105         case ForwardInt32ToDouble:
 106         case UInt32ToNumber:
 107         case DoubleAsInt32:
 108             return true;
 109         default:
 110             return false;
 111         }
 112     }
 113     static bool hasConstantNumber(NodeType type)
 114     {
 115         return type == JSConstant;
 116     }
 117     static bool hasWeakConstant(NodeType type)
 118     {
 119         return type == WeakJSConstant;
 120     }
 121
 122     MinifiedID m_id;
 123     uintptr_t m_childOrInfo; // Nodes in the minified graph have only one child each.
 124     NodeType m_op;
 125 };
 126
 127 } } // namespace JSC::DFG
 128
 129 #endif // ENABLE(DFG_JIT)
 130
 131 #endif // DFGMinifiedNode_h
 132