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/*
* Copyright (C) 2015-2016 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 "JSModuleNamespaceObject.h"
#include "AbstractModuleRecord.h"
#include "Error.h"
#include "JSCInlines.h"
#include "JSModuleEnvironment.h"
namespace JSC {
const ClassInfo JSModuleNamespaceObject::s_info = { "ModuleNamespaceObject", &Base::s_info, nullptr, CREATE_METHOD_TABLE(JSModuleNamespaceObject) };
JSModuleNamespaceObject::JSModuleNamespaceObject(VM& vm, Structure* structure)
: Base(vm, structure)
, m_exports()
{
}
void JSModuleNamespaceObject::finishCreation(ExecState* exec, JSGlobalObject*, AbstractModuleRecord* moduleRecord, Vector<std::pair<Identifier, AbstractModuleRecord::Resolution>>&& resolutions)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects
// Quoted from the spec:
// A List containing the String values of the exported names exposed as own properties of this object.
// The list is ordered as if an Array of those String values had been sorted using Array.prototype.sort using SortCompare as comparefn.
//
// Sort the exported names by the code point order.
std::sort(resolutions.begin(), resolutions.end(), [] (const auto& lhs, const auto& rhs) {
return codePointCompare(lhs.first.impl(), rhs.first.impl()) < 0;
});
m_moduleRecord.set(vm, this, moduleRecord);
{
unsigned moduleRecordOffset = 0;
m_names.reserveCapacity(resolutions.size());
for (const auto& pair : resolutions) {
moduleRecordAt(moduleRecordOffset).set(vm, this, pair.second.moduleRecord);
m_names.append(pair.first);
m_exports.add(pair.first.impl(), ExportEntry {
pair.second.localName,
moduleRecordOffset
});
++moduleRecordOffset;
}
}
putDirect(vm, vm.propertyNames->toStringTagSymbol, jsString(&vm, "Module"), DontEnum | DontDelete | ReadOnly);
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-getprototypeof
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-setprototypeof-v
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-isextensible
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-preventextensions
methodTable(vm)->preventExtensions(this, exec);
ASSERT_UNUSED(scope, !scope.exception());
}
void JSModuleNamespaceObject::destroy(JSCell* cell)
{
JSModuleNamespaceObject* thisObject = static_cast<JSModuleNamespaceObject*>(cell);
thisObject->JSModuleNamespaceObject::~JSModuleNamespaceObject();
}
void JSModuleNamespaceObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(thisObject->m_moduleRecord);
for (unsigned i = 0; i < thisObject->m_names.size(); ++i)
visitor.appendHidden(thisObject->moduleRecordAt(i));
}
static JSValue getValue(JSModuleEnvironment* environment, PropertyName localName, ScopeOffset& scopeOffset)
{
SymbolTable* symbolTable = environment->symbolTable();
{
ConcurrentJSLocker locker(symbolTable->m_lock);
auto iter = symbolTable->find(locker, localName.uid());
ASSERT(iter != symbolTable->end(locker));
SymbolTableEntry& entry = iter->value;
ASSERT(!entry.isNull());
scopeOffset = entry.scopeOffset();
}
return environment->variableAt(scopeOffset).get();
}
bool JSModuleNamespaceObject::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-getownproperty-p
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
// step 1.
// If the property name is a symbol, we don't look into the imported bindings.
// It may return the descriptor with writable: true, but namespace objects does not allow it in [[Set]] / [[DefineOwnProperty]] side.
if (propertyName.isSymbol())
return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
slot.setIsTaintedByOpaqueObject();
auto iterator = thisObject->m_exports.find(propertyName.uid());
if (iterator == thisObject->m_exports.end())
return false;
ExportEntry& exportEntry = iterator->value;
switch (slot.internalMethodType()) {
case PropertySlot::InternalMethodType::GetOwnProperty:
case PropertySlot::InternalMethodType::Get: {
JSModuleEnvironment* environment = thisObject->moduleRecordAt(exportEntry.moduleRecordOffset)->moduleEnvironment();
ScopeOffset scopeOffset;
JSValue value = getValue(environment, exportEntry.localName, scopeOffset);
// If the value is filled with TDZ value, throw a reference error.
if (!value) {
throwVMError(exec, scope, createTDZError(exec));
return false;
}
slot.setValueModuleNamespace(thisObject, DontDelete, value, environment, scopeOffset);
return true;
}
case PropertySlot::InternalMethodType::HasProperty: {
// Do not perform [[Get]] for [[HasProperty]].
// [[Get]] / [[GetOwnProperty]] onto namespace object could throw an error while [[HasProperty]] just returns true here.
// https://tc39.github.io/ecma262/#sec-module-namespace-exotic-objects-hasproperty-p
slot.setValue(thisObject, DontDelete, jsUndefined());
return true;
}
case PropertySlot::InternalMethodType::VMInquiry:
return false;
}
RELEASE_ASSERT_NOT_REACHED();
return false;
}
bool JSModuleNamespaceObject::put(JSCell*, ExecState* exec, PropertyName, JSValue, PutPropertySlot& slot)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-set-p-v-receiver
if (slot.isStrictMode())
throwTypeError(exec, scope, ASCIILiteral(ReadonlyPropertyWriteError));
return false;
}
bool JSModuleNamespaceObject::putByIndex(JSCell*, ExecState* exec, unsigned, JSValue, bool shouldThrow)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (shouldThrow)
throwTypeError(exec, scope, ASCIILiteral(ReadonlyPropertyWriteError));
return false;
}
bool JSModuleNamespaceObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-delete-p
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
if (propertyName.isSymbol())
return JSObject::deleteProperty(thisObject, exec, propertyName);
return !thisObject->m_exports.contains(propertyName.uid());
}
void JSModuleNamespaceObject::getOwnPropertyNames(JSObject* cell, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-ownpropertykeys
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
for (const auto& name : thisObject->m_names)
propertyNames.add(name.impl());
return JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
}
bool JSModuleNamespaceObject::defineOwnProperty(JSObject*, ExecState* exec, PropertyName, const PropertyDescriptor&, bool shouldThrow)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-defineownproperty-p-desc
if (shouldThrow)
throwTypeError(exec, scope, ASCIILiteral(NonExtensibleObjectPropertyDefineError));
return false;
}
} // namespace JSC
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