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/*
* Copyright (C) 2008-2021 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 "JSLexicalEnvironment.h"
#include "HeapAnalyzer.h"
#include "JSCInlines.h"
namespace JSC {
const ClassInfo JSLexicalEnvironment::s_info = { "JSLexicalEnvironment"_s, &Base::s_info, nullptr, nullptr, CREATE_METHOD_TABLE(JSLexicalEnvironment) };
template<typename Visitor>
void JSLexicalEnvironment::visitChildrenImpl(JSCell* cell, Visitor& visitor)
{
auto* thisObject = jsCast<JSLexicalEnvironment*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.appendValuesHidden(thisObject->variables(), thisObject->symbolTable()->scopeSize());
}
DEFINE_VISIT_CHILDREN(JSLexicalEnvironment);
void JSLexicalEnvironment::analyzeHeap(JSCell* cell, HeapAnalyzer& analyzer)
{
auto* thisObject = jsCast<JSLexicalEnvironment*>(cell);
Base::analyzeHeap(cell, analyzer);
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())
analyzer.analyzeVariableNameEdge(thisObject, toValue.asCell(), it->key.get());
}
}
void JSLexicalEnvironment::getOwnSpecialPropertyNames(JSObject* object, JSGlobalObject* globalObject, PropertyNameArray& propertyNames, DontEnumPropertiesMode mode)
{
JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
SymbolTable* symbolTable = thisObject->symbolTable();
{
ConcurrentJSLocker locker(symbolTable->m_lock);
SymbolTable::Map::iterator end = symbolTable->end(locker);
VM& vm = globalObject->vm();
for (SymbolTable::Map::iterator it = symbolTable->begin(locker); it != end; ++it) {
if (mode == DontEnumPropertiesMode::Exclude && it->value.isDontEnum())
continue;
if (!thisObject->isValidScopeOffset(it->value.scopeOffset()))
continue;
if (!propertyNames.includeSymbolProperties() && it->key->isSymbol())
continue;
if (propertyNames.privateSymbolMode() == PrivateSymbolMode::Exclude && symbolTable->hasPrivateName(it->key))
continue;
propertyNames.add(Identifier::fromUid(vm, it->key.get()));
}
}
}
bool JSLexicalEnvironment::getOwnPropertySlot(JSObject* object, JSGlobalObject* globalObject, PropertyName propertyName, PropertySlot& slot)
{
JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(object);
if (symbolTableGet(thisObject, propertyName, slot))
return true;
VM& vm = globalObject->vm();
unsigned attributes;
if (JSValue value = thisObject->getDirect(vm, propertyName, attributes)) {
RELEASE_ASSERT(!(attributes & PropertyAttribute::Accessor));
slot.setValue(thisObject, attributes, value);
return true;
}
// We don't call through to JSObject because there's no way to give a
// lexical environment object getter properties or a prototype.
ASSERT(!thisObject->structure()->hasAnyKindOfGetterSetterProperties());
ASSERT(thisObject->getPrototypeDirect().isNull());
return false;
}
bool JSLexicalEnvironment::put(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
JSLexicalEnvironment* thisObject = jsCast<JSLexicalEnvironment*>(cell);
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(thisObject));
bool shouldThrowReadOnlyError = slot.isStrictMode() || thisObject->isLexicalScope();
bool ignoreReadOnlyErrors = false;
bool putResult = false;
if (symbolTablePutInvalidateWatchpointSet(thisObject, globalObject, propertyName, value, shouldThrowReadOnlyError, ignoreReadOnlyErrors, putResult))
return putResult;
// We don't call through to JSObject because __proto__ and getter/setter
// properties are non-standard extensions that other implementations do not
// expose in the lexicalEnvironment object.
ASSERT(!thisObject->structure()->hasAnyKindOfGetterSetterProperties());
return thisObject->putOwnDataProperty(globalObject->vm(), propertyName, value, slot);
}
bool JSLexicalEnvironment::deleteProperty(JSCell* cell, JSGlobalObject* globalObject, PropertyName propertyName, DeletePropertySlot& slot)
{
VM& vm = globalObject->vm();
if (propertyName == vm.propertyNames->arguments)
return false;
return Base::deleteProperty(cell, globalObject, propertyName, slot);
}
} // namespace JSC
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