1/*
2 * Copyright (C) 2013 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 DFGAtTailAbstractState_h
27#define DFGAtTailAbstractState_h
28
29#if ENABLE(DFG_JIT)
30
31#include "DFGAbstractValue.h"
32#include "DFGBasicBlock.h"
33#include "DFGGraph.h"
34
35namespace JSC { namespace DFG {
36
37class AtTailAbstractState {
38public:
39    AtTailAbstractState();
40
41    ~AtTailAbstractState();
42
43    void initializeTo(BasicBlock* block)
44    {
45        m_block = block;
46    }
47
48    void createValueForNode(Node*);
49    AbstractValue& forNode(Node*);
50    AbstractValue& forNode(Edge edge) { return forNode(edge.node()); }
51    Operands<AbstractValue>& variables() { return m_block->valuesAtTail; }
52
53    BasicBlock* block() const { return m_block; }
54
55    bool isValid() { return m_block->cfaDidFinish; }
56
57    void setDidClobber(bool) { }
58    void setIsValid(bool isValid) { m_block->cfaDidFinish = isValid; }
59    void setBranchDirection(BranchDirection) { }
60    void setFoundConstants(bool) { }
61    bool haveStructures() const { return true; } // It's always safe to return true.
62    void setHaveStructures(bool) { }
63
64private:
65    BasicBlock* m_block;
66};
67
68} } // namespace JSC::DFG
69
70#endif // ENABLE(DFG_JIT)
71
72#endif // DFGAtTailAbstractState_h
73
74