mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
/*
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* Copyright (C) 2017-2020 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 "ObjectInitializationScope.h"
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#include "HeapInlines.h"
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#include "JSCJSValueInlines.h"
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#include "JSCellInlines.h"
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#include "JSObject.h"
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#include "Scribble.h"
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namespace JSC {
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#if ASSERT_ENABLED
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ObjectInitializationScope::ObjectInitializationScope(VM& vm)
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: m_vm(vm)
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{
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}
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ObjectInitializationScope::~ObjectInitializationScope()
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{
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m_vm.heap.mutatorFence();
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if (!m_object)
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return;
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verifyPropertiesAreInitialized(m_object);
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}
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void ObjectInitializationScope::notifyAllocated(JSObject* object)
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{
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ASSERT(!m_disallowGC);
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ASSERT(!m_disallowVMEntry);
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m_disallowGC.emplace();
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m_disallowVMEntry.emplace(m_vm);
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m_object = object;
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}
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void ObjectInitializationScope::notifyInitialized(JSObject* object)
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{
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if (m_object) {
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m_disallowGC.reset();
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m_disallowVMEntry.reset();
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m_object = nullptr;
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}
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verifyPropertiesAreInitialized(object);
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}
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void ObjectInitializationScope::verifyPropertiesAreInitialized(JSObject* object)
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{
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Butterfly* butterfly = object->butterfly();
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Structure* structure = object->structure(m_vm);
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IndexingType indexingType = structure->indexingType();
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unsigned vectorLength = butterfly->vectorLength();
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if (UNLIKELY(hasUndecided(indexingType)) || !hasIndexedProperties(indexingType)) {
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// Nothing to verify.
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} else if (LIKELY(!hasAnyArrayStorage(indexingType))) {
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auto data = butterfly->contiguous().data();
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for (unsigned i = 0; i < vectorLength; ++i) {
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if (isScribbledValue(data[i].get())) {
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dataLogLn("Found scribbled value at i = ", i);
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ASSERT_NOT_REACHED();
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}
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}
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} else {
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ArrayStorage* storage = butterfly->arrayStorage();
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for (unsigned i = 0; i < vectorLength; ++i) {
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if (isScribbledValue(storage->m_vector[i].get())) {
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dataLogLn("Found scribbled value at i = ", i);
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ASSERT_NOT_REACHED();
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}
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}
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}
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auto isSafeEmptyValueForGCScanning = [] (JSValue value) {
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#if USE(JSVALUE64)
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return !value;
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#else
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return !value || !JSValue::encode(value);
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#endif
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};
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for (int64_t i = 0; i < static_cast<int64_t>(structure->outOfLineCapacity()); i++) {
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// We rely on properties past the last offset be zero for concurrent GC.
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if (i + firstOutOfLineOffset > structure->maxOffset())
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ASSERT(isSafeEmptyValueForGCScanning(butterfly->propertyStorage()[-i - 1].get()));
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else if (isScribbledValue(butterfly->propertyStorage()[-i - 1].get())) {
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dataLogLn("Found scribbled property at i = ", -i - 1);
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ASSERT_NOT_REACHED();
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}
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}
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}
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#endif // ASSERT_ENABLED
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} // namespace JSC
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