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
37namespace JSC { namespace DFG {
38
39struct Node;
40
41inline 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
58class MinifiedNode {
59public:
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
99private:
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
133