weex_core/Source/include/JavaScriptCore/dfg/DFGInsertionSet.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 "DFGGraph.h"
#include <wtf/Insertion.h>
#include <wtf/Vector.h>

namespace JSC { namespace DFG {

typedef WTF::Insertion<Node*> Insertion;

class InsertionSet {
public:
    InsertionSet(Graph& graph)
        : m_graph(graph)
    {
    }
    
    Graph& graph() { return m_graph; }

    // Adds another code insertion. It's expected that you'll usually insert things in order. If
    // you don't, this function will perform a linear search to find the largest insertion point
    // at which insertion order would be preserved. This is essentially equivalent to if you did
    // a stable sort on the insertions.
    Node* insert(const Insertion& insertion)
    {
        if (LIKELY(!m_insertions.size() || m_insertions.last().index() <= insertion.index()))
            m_insertions.append(insertion);
        else
            insertSlow(insertion);
        return insertion.element();
    }
    
    Node* insert(size_t index, Node* element)
    {
        return insert(Insertion(index, element));
    }

    template<typename... Params>
    Node* insertNode(size_t index, SpeculatedType type, Params... params)
    {
        return insert(index, m_graph.addNode(type, params...));
    }
    
    Node* insertConstant(
        size_t index, NodeOrigin origin, FrozenValue* value,
        NodeType op = JSConstant)
    {
        return insertNode(
            index, speculationFromValue(value->value()), op, origin, OpInfo(value));
    }
    
    Edge insertConstantForUse(
        size_t index, NodeOrigin origin, FrozenValue* value, UseKind useKind)
    {
        NodeType op;
        if (isDouble(useKind))
            op = DoubleConstant;
        else if (useKind == Int52RepUse)
            op = Int52Constant;
        else
            op = JSConstant;
        return Edge(insertConstant(index, origin, value, op), useKind);
    }
    
    Node* insertConstant(size_t index, NodeOrigin origin, JSValue value, NodeType op = JSConstant)
    {
        return insertConstant(index, origin, m_graph.freeze(value), op);
    }
    
    Edge insertConstantForUse(size_t index, NodeOrigin origin, JSValue value, UseKind useKind)
    {
        return insertConstantForUse(index, origin, m_graph.freeze(value), useKind);
    }
    
    Edge insertBottomConstantForUse(size_t index, NodeOrigin origin, UseKind useKind)
    {
        if (isDouble(useKind))
            return insertConstantForUse(index, origin, jsNumber(PNaN), useKind);
        if (useKind == Int52RepUse)
            return insertConstantForUse(index, origin, jsNumber(0), useKind);
        return insertConstantForUse(index, origin, jsUndefined(), useKind);
    }
    
    Node* insertCheck(size_t index, NodeOrigin origin, AdjacencyList children)
    {
        children = children.justChecks();
        if (children.isEmpty())
            return nullptr;
        return insertNode(index, SpecNone, Check, origin, children);
    }
    
    Node* insertCheck(size_t index, Node* node)
    {
        return insertCheck(index, node->origin, node->children);
    }
    
    Node* insertCheck(size_t index, NodeOrigin origin, Edge edge)
    {
        if (edge.willHaveCheck())
            return insertNode(index, SpecNone, Check, origin, edge);
        return nullptr;
    }
    
    size_t execute(BasicBlock* block);

private:
    void insertSlow(const Insertion&);
    
    Graph& m_graph;
    Vector<Insertion, 8> m_insertions;
};

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)