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/*
* Copyright (C) 2012-2017 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Apple Inc. ("Apple") nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSSegmentedVariableObject.h"
#include "HeapSnapshotBuilder.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo JSSegmentedVariableObject::s_info = { "SegmentedVariableObject", &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSSegmentedVariableObject) };
ScopeOffset JSSegmentedVariableObject::findVariableIndex(void* variableAddress)
{
ConcurrentJSLocker locker(m_lock);
for (unsigned i = m_variables.size(); i--;) {
if (&m_variables[i] != variableAddress)
continue;
return ScopeOffset(i);
}
CRASH();
return ScopeOffset();
}
ScopeOffset JSSegmentedVariableObject::addVariables(unsigned numberOfVariablesToAdd, JSValue initialValue)
{
ConcurrentJSLocker locker(m_lock);
size_t oldSize = m_variables.size();
m_variables.grow(oldSize + numberOfVariablesToAdd);
for (size_t i = numberOfVariablesToAdd; i--;)
m_variables[oldSize + i].setWithoutWriteBarrier(initialValue);
return ScopeOffset(oldSize);
}
void JSSegmentedVariableObject::visitChildren(JSCell* cell, SlotVisitor& slotVisitor)
{
JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, slotVisitor);
// FIXME: We could avoid locking here if SegmentedVector was lock-free. It could be made lock-free
// relatively easily.
auto locker = holdLock(thisObject->m_lock);
for (unsigned i = thisObject->m_variables.size(); i--;)
slotVisitor.appendHidden(thisObject->m_variables[i]);
}
void JSSegmentedVariableObject::heapSnapshot(JSCell* cell, HeapSnapshotBuilder& builder)
{
JSSegmentedVariableObject* thisObject = jsCast<JSSegmentedVariableObject*>(cell);
Base::heapSnapshot(cell, builder);
ConcurrentJSLocker locker(thisObject->symbolTable()->m_lock);
SymbolTable::Map::iterator end = thisObject->symbolTable()->end(locker);
for (SymbolTable::Map::iterator it = thisObject->symbolTable()->begin(locker); it != end; ++it) {
SymbolTableEntry::Fast entry = it->value;
ASSERT(!entry.isNull());
ScopeOffset offset = entry.scopeOffset();
if (!thisObject->isValidScopeOffset(offset))
continue;
JSValue toValue = thisObject->variableAt(offset).get();
if (toValue && toValue.isCell())
builder.appendVariableNameEdge(thisObject, toValue.asCell(), it->key.get());
}
}
void JSSegmentedVariableObject::destroy(JSCell* cell)
{
static_cast<JSSegmentedVariableObject*>(cell)->JSSegmentedVariableObject::~JSSegmentedVariableObject();
}
JSSegmentedVariableObject::JSSegmentedVariableObject(VM& vm, Structure* structure, JSScope* scope)
: JSSymbolTableObject(vm, structure, scope)
, m_classInfo(structure->classInfo())
{
}
JSSegmentedVariableObject::~JSSegmentedVariableObject()
{
RELEASE_ASSERT(!m_alreadyDestroyed);
m_alreadyDestroyed = true;
}
void JSSegmentedVariableObject::finishCreation(VM& vm)
{
Base::finishCreation(vm);
setSymbolTable(vm, SymbolTable::create(vm));
}
} // namespace JSC