mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/*
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* Copyright (C) 2017-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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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.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "PolyProtoAccessChain.h"
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#include "JSCInlines.h"
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namespace JSC {
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std::unique_ptr<PolyProtoAccessChain> PolyProtoAccessChain::create(JSGlobalObject* globalObject, JSCell* base, const PropertySlot& slot)
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{
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JSObject* target = slot.isUnset() ? nullptr : slot.slotBase();
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return create(globalObject, base, target);
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}
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std::unique_ptr<PolyProtoAccessChain> PolyProtoAccessChain::create(JSGlobalObject* globalObject, JSCell* base, JSObject* target)
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{
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JSCell* current = base;
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VM& vm = base->vm();
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bool found = false;
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std::unique_ptr<PolyProtoAccessChain> result(new PolyProtoAccessChain());
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for (unsigned iterationNumber = 0; true; ++iterationNumber) {
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Structure* structure = current->structure(vm);
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if (structure->isDictionary())
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return nullptr;
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if (!structure->propertyAccessesAreCacheable())
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return nullptr;
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if (structure->isProxy())
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return nullptr;
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// To save memory, we don't include the base in the chain. We let
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// AccessCase provide the base to us as needed.
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if (iterationNumber)
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result->m_chain.append(structure->id());
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else
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RELEASE_ASSERT(current == base);
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if (current == target) {
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found = true;
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break;
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}
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JSValue prototype = structure->prototypeForLookup(globalObject, current);
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if (prototype.isNull())
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break;
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current = asObject(prototype);
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}
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if (!found && !!target)
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return nullptr;
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result->m_chain.shrinkToFit();
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return result;
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}
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bool PolyProtoAccessChain::needImpurePropertyWatchpoint(VM& vm) const
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{
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for (StructureID structureID : m_chain) {
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if (vm.getStructure(structureID)->needImpurePropertyWatchpoint())
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return true;
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}
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return false;
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}
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bool PolyProtoAccessChain::operator==(const PolyProtoAccessChain& other) const
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{
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return m_chain == other.m_chain;
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}
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void PolyProtoAccessChain::dump(Structure* baseStructure, PrintStream& out) const
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{
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out.print("PolyPolyProtoAccessChain: [\n");
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forEach(baseStructure->vm(), baseStructure, [&] (Structure* structure, bool) {
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out.print("\t");
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structure->dump(out);
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out.print("\n");
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});
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}
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}
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