mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
119 lines
4.4 KiB
C++
119 lines
4.4 KiB
C++
/*
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* Copyright (C) 2012-2017 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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*
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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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* 3. Neither the name of Apple Inc. ("Apple") nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY 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 OF
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* 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 "JSSegmentedVariableObject.h"
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#include "HeapAnalyzer.h"
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#include "JSCInlines.h"
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namespace JSC {
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const ClassInfo JSSegmentedVariableObject::s_info = { "SegmentedVariableObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSSegmentedVariableObject) };
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ScopeOffset JSSegmentedVariableObject::findVariableIndex(void* variableAddress)
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{
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auto locker = holdLock(cellLock());
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for (unsigned i = m_variables.size(); i--;) {
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if (&m_variables[i] != variableAddress)
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continue;
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return ScopeOffset(i);
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}
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CRASH();
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return ScopeOffset();
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}
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ScopeOffset JSSegmentedVariableObject::addVariables(unsigned numberOfVariablesToAdd, JSValue initialValue)
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{
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auto locker = holdLock(cellLock());
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size_t oldSize = m_variables.size();
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m_variables.grow(oldSize + numberOfVariablesToAdd);
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for (size_t i = numberOfVariablesToAdd; i--;)
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m_variables[oldSize + i].setWithoutWriteBarrier(initialValue);
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return ScopeOffset(oldSize);
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}
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void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
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{
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JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
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ASSERT_GC_OBJECT_INHERITS(thisObject, info());
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Base::visitChildren(thisObject, slotVisitor);
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// FIXME: We could avoid locking here if SegmentedVector was lock-free. It could be made lock-free
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// relatively easily.
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auto locker = holdLock(thisObject->cellLock());
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for (unsigned i = thisObject->m_variables.size(); i--;)
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slotVisitor.appendHidden(thisObject->m_variables[i]);
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}
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void JSSegmentedVariableObject::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
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{
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JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
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Base::analyzeHeap(cell, analyzer);
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ConcurrentJSLocker locker(thisObject->symbolTable()->m_lock);
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SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
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for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
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SymbolTableEntry::Fast entry = it->value;
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ASSERT(!entry.isNull());
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ScopeOffset offset = entry.scopeOffset();
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if (!thisObject->isValidScopeOffset(offset))
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continue;
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JSValue toValue = thisObject->variableAt(offset).get();
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if (toValue && toValue.isCell())
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analyzer.analyzeVariableNameEdge(thisObject, toValue.asCell(), it->key.get());
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}
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}
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JSSegmentedVariableObject::JSSegmentedVariableObject(VM& vm, Structure* structure, JSScope* scope)
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: JSSymbolTableObject(vm, structure, scope)
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{
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}
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JSSegmentedVariableObject::~JSSegmentedVariableObject()
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{
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#ifndef NDEBUG
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ASSERT(!m_alreadyDestroyed);
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m_alreadyDestroyed = true;
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#endif
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}
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void JSSegmentedVariableObject::finishCreation(VM& vm)
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{
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Base::finishCreation(vm);
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setSymbolTable(vm, SymbolTable::create(vm));
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}
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} // namespace JSC
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