DFGStructureRegistrationPhase.cpp   [plain text]

/*
 * Copyright (C) 2014, 2015 Apple Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
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 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
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#include "config.h"
#include "DFGStructureRegistrationPhase.h"

#if ENABLE(DFG_JIT)

#include "DFGBasicBlockInlines.h"
#include "DFGGraph.h"
#include "DFGPhase.h"
#include "JSCInlines.h"

namespace JSC { namespace DFG {

class StructureRegistrationPhase : public Phase {
public:
    StructureRegistrationPhase(Graph& graph)
        : Phase(graph, "structure registration")
    {
    }
    
    bool run()
    {
        // We need to set this before this phase finishes. This phase doesn't do anything
        // conditioned on this field, except for assertIsRegistered() below. We intend for that
        // method to behave as if the phase was already finished. So, we set this up here.
        m_graph.m_structureRegistrationState = AllStructuresAreRegistered;
        
        // These are pretty dumb, but needed to placate subsequent assertions. We don't actually
        // have to watch these because there is no way to transition away from it, but they are
        // watchable and so we will assert if they aren't watched.
        registerStructure(m_graph.m_vm.structureStructure.get());
        registerStructure(m_graph.m_vm.stringStructure.get());
        registerStructure(m_graph.m_vm.getterSetterStructure.get());
        
        for (FrozenValue* value : m_graph.m_frozenValues)
            assertIsRegistered(value->structure());
        
        for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
            BasicBlock* block = m_graph.block(blockIndex);
            if (!block)
                continue;
        
            for (unsigned nodeIndex = 0; nodeIndex < block->size(); ++nodeIndex) {
                Node* node = block->at(nodeIndex);
            
                switch (node->op()) {
                case CheckStructure:
                    assertAreRegistered(node->structureSet());
                    break;
                
                case NewObject:
                case ArrayifyToStructure:
                case NewStringObject:
                    registerStructure(node->structure());
                    break;
                
                case PutStructure:
                case AllocatePropertyStorage:
                case ReallocatePropertyStorage:
                    registerStructure(node->transition()->previous);
                    registerStructure(node->transition()->next);
                    break;
                    
                case MultiGetByOffset:
                    for (unsigned i = node->multiGetByOffsetData().variants.size(); i--;) {
                        GetByIdVariant& variant = node->multiGetByOffsetData().variants[i];
                        registerStructures(variant.structureSet());
                        // Don't need to watch anything in the structure chain because that would
                        // have been decomposed into CheckStructure's. Don't need to watch the
                        // callLinkStatus because we wouldn't use MultiGetByOffset if any of the
                        // variants did that.
                        ASSERT(!variant.callLinkStatus());
                    }
                    break;
                    
                case MultiPutByOffset:
                    for (unsigned i = node->multiPutByOffsetData().variants.size(); i--;) {
                        PutByIdVariant& variant = node->multiPutByOffsetData().variants[i];
                        registerStructures(variant.oldStructure());
                        if (variant.kind() == PutByIdVariant::Transition)
                            registerStructure(variant.newStructure());
                    }
                    break;
                    
                case NewArray:
                case NewArrayBuffer:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->arrayStructureForIndexingTypeDuringAllocation(node->indexingType()));
                    break;
                    
                case NewTypedArray:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->typedArrayStructure(node->typedArrayType()));
                    break;
                    
                case ToString:
                case CallStringConstructor:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->stringObjectStructure());
                    break;
                    
                case CreateActivation:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->activationStructure());
                    break;
                    
                case CreateDirectArguments:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->directArgumentsStructure());
                    break;
                    
                case CreateScopedArguments:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->scopedArgumentsStructure());
                    break;
                    
                case NewRegexp:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->regExpStructure());
                    break;
                    
                case NewFunction:
                    registerStructure(m_graph.globalObjectFor(node->origin.semantic)->functionStructure());
                    break;
                    
                default:
                    break;
                }
            }
        }
        
        return true;
    }

private:
    void registerStructures(const StructureSet& set)
    {
        for (Structure* structure : set)
            registerStructure(structure);
    }
    
    void registerStructure(Structure* structure)
    {
        if (structure)
            m_graph.registerStructure(structure);
    }

    void assertAreRegistered(const StructureSet& set)
    {
        for (Structure* structure : set)
            assertIsRegistered(structure);
    }

    void assertIsRegistered(Structure* structure)
    {
        if (structure)
            m_graph.assertIsRegistered(structure);
    }
};

bool performStructureRegistration(Graph& graph)
{
    SamplingRegion samplingRegion("DFG Structure Registration Phase");
    return runPhase<StructureRegistrationPhase>(graph);
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)