Source/JavaScriptCore/dfg/DFGAtTailAbstractState.cpp

/*
 * Copyright (C) 2013, 2016 Apple Inc. All rights reserved.
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#include "config.h"
#include "DFGAtTailAbstractState.h"
#include "DFGBlockMapInlines.h"

#if ENABLE(DFG_JIT)

#include "JSCJSValueInlines.h"

namespace JSC { namespace DFG {

AtTailAbstractState::AtTailAbstractState(Graph& graph)
    : m_graph(graph)
    , m_valuesAtTailMap(m_graph)
{
    for (BasicBlock* block : graph.blocksInNaturalOrder()) {
        auto& valuesAtTail = m_valuesAtTailMap.at(block);
        valuesAtTail.clear();
        for (auto& valueAtTailPair : block->ssa->valuesAtTail)
            valuesAtTail.add(valueAtTailPair.node, valueAtTailPair.value);
    }
}

AtTailAbstractState::~AtTailAbstractState() { }

void AtTailAbstractState::createValueForNode(NodeFlowProjection node)
{
    m_valuesAtTailMap.at(m_block).add(node, AbstractValue());
}

AbstractValue& AtTailAbstractState::forNode(NodeFlowProjection node)
{
    auto& valuesAtTail = m_valuesAtTailMap.at(m_block);
    HashMap<NodeFlowProjection, AbstractValue>::iterator iter = valuesAtTail.find(node);
    DFG_ASSERT(m_graph, node.node(), iter != valuesAtTail.end());
    return iter->value;
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)