weex_core/Source/include/JavaScriptCore/dfg/DFGEdgeDominates.h

/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
#pragma once

#if ENABLE(DFG_JIT)

#include "DFGDominators.h"
#include "DFGGraph.h"

namespace JSC { namespace DFG {

class EdgeDominates {
    static const bool verbose = false;
    
public:
    EdgeDominates(Graph& graph, BasicBlock* block)
        : m_graph(graph)
        , m_block(block)
        , m_result(true)
    {
    }
    
    void operator()(Node*, Edge edge)
    {
        bool result = m_graph.m_dominators->dominates(edge.node()->owner, m_block);
        if (verbose) {
            dataLog(
                "Checking if ", edge, " in ", *edge.node()->owner,
                " dominates ", *m_block, ": ", result, "\n");
        }
        m_result &= result;
    }
    
    bool result() const { return m_result; }

private:
    Graph& m_graph;
    BasicBlock* m_block;
    bool m_result;
};

inline bool edgesDominate(Graph& graph, Node* node, BasicBlock* block)
{
    EdgeDominates edgeDominates(graph, block);
    DFG_NODE_DO_TO_CHILDREN(graph, node, edgeDominates);
    return edgeDominates.result();
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)