LLIntPrototypeLoadAdaptiveStructureWatchpoint.cpp   [plain text]

/*
 * Copyright (C) 2016-2019 Apple Inc. All rights reserved.
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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#include "config.h"
#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"

#include "CodeBlock.h"
#include "Instruction.h"
#include "JSCellInlines.h"

namespace JSC {

LLIntPrototypeLoadAdaptiveStructureWatchpoint::LLIntPrototypeLoadAdaptiveStructureWatchpoint(CodeBlock* owner, const ObjectPropertyCondition& key, unsigned bytecodeOffset)
    : Watchpoint(Watchpoint::Type::LLIntPrototypeLoadAdaptiveStructure)
    , m_owner(owner)
    , m_bytecodeOffset(bytecodeOffset)
    , m_key(key)
{
    RELEASE_ASSERT(key.watchingRequiresStructureTransitionWatchpoint());
    RELEASE_ASSERT(!key.watchingRequiresReplacementWatchpoint());
}

void LLIntPrototypeLoadAdaptiveStructureWatchpoint::install(VM& vm)
{
    RELEASE_ASSERT(m_key.isWatchable());

    m_key.object()->structure(vm)->addTransitionWatchpoint(this);
}

void LLIntPrototypeLoadAdaptiveStructureWatchpoint::fireInternal(VM& vm, const FireDetail&)
{
    if (!m_owner->isLive())
        return;

    if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
        install(vm);
        return;
    }

    auto& instruction = m_owner->instructions().at(m_bytecodeOffset.get());
    switch (instruction->opcodeID()) {
    case op_get_by_id:
        clearLLIntGetByIdCache(instruction->as<OpGetById>().metadata(m_owner.get()).m_modeMetadata);
        break;

    case op_iterator_open:
        clearLLIntGetByIdCache(instruction->as<OpIteratorOpen>().metadata(m_owner.get()).m_modeMetadata);
        break;

    case op_iterator_next: {
        auto& metadata = instruction->as<OpIteratorNext>().metadata(m_owner.get());
        clearLLIntGetByIdCache(metadata.m_doneModeMetadata);
        clearLLIntGetByIdCache(metadata.m_valueModeMetadata);
        break;
    }

    default:
        RELEASE_ASSERT_NOT_REACHED();
        break;
    }
}

void LLIntPrototypeLoadAdaptiveStructureWatchpoint::clearLLIntGetByIdCache(GetByIdModeMetadata& metadata)
{
    metadata.clearToDefaultModeWithoutCache();
}

} // namespace JSC