diff options
Diffstat (limited to 'Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp')
-rw-r--r-- | Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp b/Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp new file mode 100644 index 000000000..3606882d4 --- /dev/null +++ b/Source/JavaScriptCore/runtime/JSModuleNamespaceObject.cpp @@ -0,0 +1,221 @@ +/* + * 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 |