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 #if ENABLE(DFG_JIT)
  30
  31 #include "DFGCommon.h"
  32 #include "DFGMinifiedID.h"
  33 #include "DFGNodeType.h"
  34
  35 namespace JSC { namespace DFG {
  36
  37 struct Node;
  38
  39 inline bool belongsInMinifiedGraph(NodeType type)
  40 {
  41     switch (type) {
  42     case JSConstant:
  43     case Int52Constant:
  44     case DoubleConstant:
  45     case WeakJSConstant:
  46     case PhantomArguments:
  47         return true;
  48     default:
  49         return false;
  50     }
  51 }
  52
  53 class MinifiedNode {
  54 public:
  55     MinifiedNode() { }
  56
  57     static MinifiedNode fromNode(Node*);
  58
  59     MinifiedID id() const { return m_id; }
  60     NodeType op() const { return m_op; }
  61
  62     bool hasConstant() const { return hasConstantNumber() || hasWeakConstant(); }
  63
  64     bool hasConstantNumber() const { return hasConstantNumber(m_op); }
  65
  66     unsigned constantNumber() const
  67     {
  68         ASSERT(hasConstantNumber(m_op));
  69         return m_info;
  70     }
  71
  72     bool hasWeakConstant() const { return hasWeakConstant(m_op); }
  73
  74     JSCell* weakConstant() const
  75     {
  76         ASSERT(hasWeakConstant(m_op));
  77         return bitwise_cast<JSCell*>(m_info);
  78     }
  79
  80     static MinifiedID getID(MinifiedNode* node) { return node->id(); }
  81     static bool compareByNodeIndex(const MinifiedNode& a, const MinifiedNode& b)
  82     {
  83         return a.m_id < b.m_id;
  84     }
  85
  86 private:
  87     static bool hasConstantNumber(NodeType type)
  88     {
  89         return type == JSConstant || type == Int52Constant || type == DoubleConstant;
  90     }
  91     static bool hasWeakConstant(NodeType type)
  92     {
  93         return type == WeakJSConstant;
  94     }
  95
  96     MinifiedID m_id;
  97     uintptr_t m_info;
  98     NodeType m_op;
  99 };
 100
 101 } } // namespace JSC::DFG
 102
 103 #endif // ENABLE(DFG_JIT)
 104
 105 #endif // DFGMinifiedNode_h
 106