mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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84 lines
3.5 KiB
C++
84 lines
3.5 KiB
C++
/*
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* Copyright (C) 2008 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 "StructureChain.h"
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#include "JSCInlines.h"
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namespace JSC {
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const ClassInfo StructureChain::s_info = { "StructureChain", nullptr, nullptr, nullptr, CREATE_METHOD_TABLE(StructureChain) };
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StructureChain::StructureChain(VM& vm, Structure* structure, StructureID* vector)
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: Base(vm, structure)
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, m_vector(vm, this, vector)
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{
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}
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StructureChain* StructureChain::create(VM& vm, JSObject* head)
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{
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// FIXME: Make StructureChain::create fail for large chain. Caching large chain is not so profitable.
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// By making the size <= UINT16_MAX, we can store length in a high bits of auxiliary pointer.
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// https://bugs.webkit.org/show_bug.cgi?id=200290
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size_t size = 0;
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for (JSObject* current = head; current; current = current->structure(vm)->storedPrototypeObject(current))
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++size;
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++size; // Sentinel nullptr.
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size_t bytes = (Checked<size_t>(size) * sizeof(StructureID)).unsafeGet();
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StructureID* vector = static_cast<StructureID*>(vm.jsValueGigacageAuxiliarySpace.allocateNonVirtual(vm, bytes, nullptr, AllocationFailureMode::Assert));
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memset(vector, 0, bytes);
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StructureChain* chain = new (NotNull, allocateCell<StructureChain>(vm.heap)) StructureChain(vm, vm.structureChainStructure.get(), vector);
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chain->finishCreation(vm, head);
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return chain;
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}
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void StructureChain::finishCreation(VM& vm, JSObject* head)
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{
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Base::finishCreation(vm);
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size_t i = 0;
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for (JSObject* current = head; current; current = current->structure(vm)->storedPrototypeObject(current)) {
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Structure* structure = current->structure(vm);
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m_vector.get()[i++] = structure->id();
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vm.heap.writeBarrier(this);
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}
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}
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void StructureChain::visitChildren(JSCell* cell, SlotVisitor& visitor)
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{
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StructureChain* thisObject = jsCast<StructureChain*>(cell);
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ASSERT_GC_OBJECT_INHERITS(thisObject, info());
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Base::visitChildren(thisObject, visitor);
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visitor.markAuxiliary(thisObject->m_vector.get());
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VM& vm = visitor.vm();
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for (auto* current = thisObject->m_vector.get(); *current; ++current) {
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StructureID structureID = *current;
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Structure* structure = vm.getStructure(structureID);
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visitor.appendUnbarriered(structure);
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}
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}
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} // namespace JSC
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