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/*
* Copyright (C) 2015 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 "Error.h"
#include "IdentifierInlines.h"
#include "JSCJSValueInlines.h"
#include "JSCellInlines.h"
#include "JSModuleEnvironment.h"
#include "JSModuleRecord.h"
#include "JSPropertyNameIterator.h"
#include "SlotVisitorInlines.h"
#include "StructureInlines.h"
namespace JSC {
static EncodedJSValue JSC_HOST_CALL moduleNamespaceObjectSymbolIterator(ExecState*);
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(VM& vm, JSGlobalObject* globalObject, JSModuleRecord* moduleRecord, const IdentifierSet& exports)
{
Base::finishCreation(vm);
ASSERT(inherits(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.
Vector<UniquedStringImpl*> temporaryVector(exports.size(), nullptr);
std::transform(exports.begin(), exports.end(), temporaryVector.begin(), [](const RefPtr<WTF::UniquedStringImpl>& ref) {
return ref.get();
});
std::sort(temporaryVector.begin(), temporaryVector.end(), [] (UniquedStringImpl* lhs, UniquedStringImpl* rhs) {
return codePointCompare(lhs, rhs) < 0;
});
for (auto* identifier : temporaryVector)
m_exports.add(identifier);
m_moduleRecord.set(vm, this, moduleRecord);
JSC_NATIVE_FUNCTION(vm.propertyNames->iteratorSymbol, moduleNamespaceObjectSymbolIterator, DontEnum, 0);
putDirect(vm, vm.propertyNames->toStringTagSymbol, jsString(&vm, "Module"), DontEnum | 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
preventExtensions(vm);
}
void JSModuleNamespaceObject::destroy(JSCell* cell)
{
JSModuleNamespaceObject* thisObject = jsCast<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);
}
static EncodedJSValue callbackGetter(ExecState* exec, EncodedJSValue thisValue, PropertyName propertyName)
{
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(JSValue::decode(thisValue));
JSModuleRecord* moduleRecord = thisObject->moduleRecord();
JSModuleRecord::Resolution resolution = moduleRecord->resolveExport(exec, Identifier::fromUid(exec, propertyName.uid()));
ASSERT(resolution.type != JSModuleRecord::Resolution::Type::NotFound && resolution.type != JSModuleRecord::Resolution::Type::Ambiguous);
JSModuleRecord* targetModule = resolution.moduleRecord;
JSModuleEnvironment* targetEnvironment = targetModule->moduleEnvironment();
PropertySlot trampolineSlot(targetEnvironment, PropertySlot::InternalMethodType::Get);
if (!targetEnvironment->methodTable(exec->vm())->getOwnPropertySlot(targetEnvironment, exec, resolution.localName, trampolineSlot))
return JSValue::encode(jsUndefined());
JSValue value = trampolineSlot.getValue(exec, propertyName);
if (exec->hadException())
return JSValue::encode(jsUndefined());
// If the value is filled with TDZ value, throw a reference error.
if (!value)
return throwVMError(exec, createTDZError(exec));
return JSValue::encode(value);
}
bool JSModuleNamespaceObject::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
// 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);
if (!thisObject->m_exports.contains(propertyName.uid()))
return false;
// https://esdiscuss.org/topic/march-24-meeting-notes
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-getownproperty-p
// section 9.4.6.5, step 6.
// This property will be seen as writable: true, enumerable:true, configurable: false.
// But this does not mean that this property is writable by users.
//
// In JSC, getOwnPropertySlot is not designed to throw any errors. But looking up the value from the module
// environment may throw error if the loaded variable is the TDZ value. To workaround, we set the custom
// getter function. When it is called, it looks up the variable and throws an error if the variable is not
// initialized.
slot.setCustom(thisObject, DontDelete, callbackGetter);
return true;
}
void JSModuleNamespaceObject::put(JSCell*, ExecState* exec, PropertyName, JSValue, PutPropertySlot& slot)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-set-p-v-receiver
if (slot.isStrictMode())
throwTypeError(exec, ASCIILiteral(StrictModeReadonlyPropertyWriteError));
}
void JSModuleNamespaceObject::putByIndex(JSCell*, ExecState* exec, unsigned, JSValue, bool shouldThrow)
{
if (shouldThrow)
throwTypeError(exec, ASCIILiteral(StrictModeReadonlyPropertyWriteError));
}
bool JSModuleNamespaceObject::deleteProperty(JSCell* cell, ExecState*, PropertyName propertyName)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-delete-p
JSModuleNamespaceObject* thisObject = jsCast<JSModuleNamespaceObject*>(cell);
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_exports)
propertyNames.add(name.get());
return JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
}
bool JSModuleNamespaceObject::defineOwnProperty(JSObject*, ExecState* exec, PropertyName, const PropertyDescriptor&, bool shouldThrow)
{
// http://www.ecma-international.org/ecma-262/6.0/#sec-module-namespace-exotic-objects-defineownproperty-p-desc
if (shouldThrow)
throwTypeError(exec, ASCIILiteral("Attempting to define property on object that is not extensible."));
return false;
}
EncodedJSValue JSC_HOST_CALL moduleNamespaceObjectSymbolIterator(ExecState* exec)
{
JSValue thisValue = exec->thisValue();
if (!thisValue.isObject())
return JSValue::encode(throwTypeError(exec, ASCIILiteral("|this| should be an object")));
return JSValue::encode(JSPropertyNameIterator::create(exec, exec->lexicalGlobalObject()->propertyNameIteratorStructure(), asObject(thisValue)));
}
} // namespace JSC
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