dfg/DFGEdgeDominates.h

   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
  33 namespace JSC { namespace DFG {
  34
  35 class EdgeDominates {
  36     static const bool verbose = false;
  37
  38 public:
  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()->owner, m_block);
  49         if (verbose) {
  50             dataLog(
  51                 "Checking if ", edge, " in ", *edge.node()->owner,
  52                 " dominates ", *m_block, ": ", result, "\n");
  53         }
  54         m_result &= result;
  55     }
  56
  57     bool result() const { return m_result; }
  58
  59 private:
  60     Graph& m_graph;
  61     BasicBlock* m_block;
  62     bool m_result;
  63 };
  64
  65 inline 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