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 DFGEdgeDominates_h
27#define DFGEdgeDominates_h
28
29#if ENABLE(DFG_JIT)
30
31#include "DFGGraph.h"
32
33namespace JSC { namespace DFG {
34
35class EdgeDominates {
36    static const bool verbose = false;
37
38public:
39    EdgeDominates(Graph& graph, BasicBlock* block)
40        : m_graph(graph)
41        , m_block(block)
42        , m_result(true)
43    {
44    }
45
46    void operator()(Node*, Edge edge)
47    {
48        bool result = m_graph.m_dominators.dominates(edge.node()->misc.owner, m_block);
49        if (verbose) {
50            dataLog(
51                "Checking if ", edge, " in ", *edge.node()->misc.owner,
52                " dominates ", *m_block, ": ", result, "\n");
53        }
54        m_result &= result;
55    }
56
57    bool result() const { return m_result; }
58
59private:
60    Graph& m_graph;
61    BasicBlock* m_block;
62    bool m_result;
63};
64
65inline bool edgesDominate(Graph& graph, Node* node, BasicBlock* block)
66{
67    EdgeDominates edgeDominates(graph, block);
68    DFG_NODE_DO_TO_CHILDREN(graph, node, edgeDominates);
69    return edgeDominates.result();
70}
71
72} } // namespace JSC::DFG
73
74#endif // ENABLE(DFG_JIT)
75
76#endif // DFGEdgeDominates_h
77
78