DFGDesiredGlobalProperties.cpp   [plain text]

/*
 * Copyright (C) 2019 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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 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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 * 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 "DFGDesiredGlobalProperties.h"

#if ENABLE(DFG_JIT)

#include "CodeBlock.h"
#include "DFGCommonData.h"
#include "DFGDesiredIdentifiers.h"
#include "JSCInlines.h"
#include "JSGlobalObject.h"

namespace JSC { namespace DFG {

bool DesiredGlobalProperties::isStillValidOnMainThread(VM& vm, DesiredIdentifiers& identifiers)
{
    bool isStillValid = true;
    for (const auto& property : m_set) {
        auto* uid = identifiers.at(property.identifierNumber());
        JSGlobalObject* globalObject = property.globalObject();
        {
            SymbolTable* symbolTable = globalObject->globalLexicalEnvironment()->symbolTable();
            ConcurrentJSLocker locker(symbolTable->m_lock);
            if (!symbolTable->contains(locker, uid))
                continue;
        }
        // Set invalidated WatchpointSet here to prevent further compile-and-fail loop.
        property.globalObject()->ensureReferencedPropertyWatchpointSet(uid).fireAll(vm, "Lexical binding shadows an existing global property");
        isStillValid = false;
    }
    return isStillValid;
}

void DesiredGlobalProperties::reallyAdd(CodeBlock* codeBlock, DesiredIdentifiers& identifiers, CommonData& common)
{
    for (const auto& property : m_set) {
        auto* uid = identifiers.at(property.identifierNumber());
        auto& watchpointSet = property.globalObject()->ensureReferencedPropertyWatchpointSet(uid);
        ASSERT(watchpointSet.isStillValid());
        watchpointSet.add(common.watchpoints.add(codeBlock));
    }
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)