diff options
Diffstat (limited to 'src/qml/jsruntime/qv4proxy.cpp')
| -rw-r--r-- | src/qml/jsruntime/qv4proxy.cpp | 782 |
1 files changed, 782 insertions, 0 deletions
diff --git a/src/qml/jsruntime/qv4proxy.cpp b/src/qml/jsruntime/qv4proxy.cpp new file mode 100644 index 0000000000..9325e2e53b --- /dev/null +++ b/src/qml/jsruntime/qv4proxy.cpp @@ -0,0 +1,782 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtQml module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + + +#include "qv4proxy_p.h" +#include "qv4symbol_p.h" +#include "qv4jscall_p.h" +#include "qv4objectproto_p.h" +#include "qv4persistent_p.h" +#include "qv4objectiterator_p.h" + +using namespace QV4; + +DEFINE_OBJECT_VTABLE(ProxyObject); +DEFINE_OBJECT_VTABLE(ProxyFunctionObject); + +void Heap::ProxyObject::init(const QV4::Object *target, const QV4::Object *handler) +{ + Object::init(); + ExecutionEngine *e = internalClass->engine; + this->target.set(e, target->d()); + this->handler.set(e, handler->d()); +} + +void Heap::ProxyFunctionObject::init(const QV4::FunctionObject *target, const QV4::Object *handler) +{ + ExecutionEngine *e = internalClass->engine; + FunctionObject::init(e->rootContext()); + this->target.set(e, target->d()); + this->handler.set(e, handler->d()); + + if (!target->isConstructor()) + jsConstruct = nullptr; +} + + +ReturnedValue ProxyObject::virtualGet(const Managed *m, PropertyKey id, const Value *receiver, bool *hasProperty) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedValue trap(scope, handler->get(scope.engine->id_get())); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->get(id, receiver, hasProperty); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + if (hasProperty) + *hasProperty = true; + + JSCallData cdata(scope, 3, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.toStringOrSymbol(scope.engine); + cdata.args[2] = *receiver; + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + ScopedProperty targetDesc(scope); + PropertyAttributes attributes = target->getOwnProperty(id, targetDesc); + if (attributes != Attr_Invalid && !attributes.isConfigurable()) { + if (attributes.isData() && !attributes.isWritable()) { + if (!trapResult->sameValue(targetDesc->value)) + return scope.engine->throwTypeError(); + } + if (attributes.isAccessor() && targetDesc->value.isUndefined()) { + if (!trapResult->isUndefined()) + return scope.engine->throwTypeError(); + } + } + return trapResult->asReturnedValue(); +} + +bool ProxyObject::virtualPut(Managed *m, PropertyKey id, const Value &value, Value *receiver) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedValue trap(scope, handler->get(scope.engine->id_set())); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->put(id, value, receiver); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + JSCallData cdata(scope, 4, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.toStringOrSymbol(scope.engine); + cdata.args[2] = value; + cdata.args[3] = *receiver; + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + if (!trapResult->toBoolean()) + return false; + ScopedProperty targetDesc(scope); + PropertyAttributes attributes = target->getOwnProperty(id, targetDesc); + if (attributes != Attr_Invalid && !attributes.isConfigurable()) { + if (attributes.isData() && !attributes.isWritable()) { + if (!value.sameValue(targetDesc->value)) + return scope.engine->throwTypeError(); + } + if (attributes.isAccessor() && targetDesc->set.isUndefined()) + return scope.engine->throwTypeError(); + } + return true; +} + +bool ProxyObject::virtualDeleteProperty(Managed *m, PropertyKey id) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString deleteProp(scope, scope.engine->newString(QStringLiteral("deleteProperty"))); + ScopedValue trap(scope, handler->get(deleteProp)); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->deleteProperty(id); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + JSCallData cdata(scope, 3, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.toStringOrSymbol(scope.engine); + cdata.args[2] = o->d(); // ### fix receiver handling + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + if (!trapResult->toBoolean()) + return false; + ScopedProperty targetDesc(scope); + PropertyAttributes attributes = target->getOwnProperty(id, targetDesc); + if (attributes == Attr_Invalid) + return true; + if (!attributes.isConfigurable()) + return scope.engine->throwTypeError(); + return true; +} + +bool ProxyObject::virtualHasProperty(const Managed *m, PropertyKey id) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString hasProp(scope, scope.engine->newString(QStringLiteral("has"))); + ScopedValue trap(scope, handler->get(hasProp)); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->hasProperty(id); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + JSCallData cdata(scope, 2, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.isArrayIndex() ? Value::fromUInt32(id.asArrayIndex()).toString(scope.engine) : id.asStringOrSymbol(); + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + bool result = trapResult->toBoolean(); + if (!result) { + ScopedProperty targetDesc(scope); + PropertyAttributes attributes = target->getOwnProperty(id, targetDesc); + if (attributes != Attr_Invalid) { + if (!attributes.isConfigurable() || !target->isExtensible()) + return scope.engine->throwTypeError(); + } + } + return result; +} + +PropertyAttributes ProxyObject::virtualGetOwnProperty(const Managed *m, PropertyKey id, Property *p) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString deleteProp(scope, scope.engine->newString(QStringLiteral("getOwnPropertyDescriptor"))); + ScopedValue trap(scope, handler->get(deleteProp)); + if (scope.hasException()) + return Attr_Invalid; + if (trap->isNullOrUndefined()) + return target->getOwnProperty(id, p); + if (!trap->isFunctionObject()) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + + JSCallData cdata(scope, 2, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.isArrayIndex() ? Value::fromUInt32(id.asArrayIndex()).toString(scope.engine) : id.asStringOrSymbol(); + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + if (!trapResult->isObject() && !trapResult->isUndefined()) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + + ScopedProperty targetDesc(scope); + PropertyAttributes targetAttributes = target->getOwnProperty(id, targetDesc); + if (trapResult->isUndefined()) { + p->value = Encode::undefined(); + if (targetAttributes == Attr_Invalid) { + p->value = Encode::undefined(); + return Attr_Invalid; + } + if (!targetAttributes.isConfigurable() || !target->isExtensible()) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + return Attr_Invalid; + } + + //bool extensibleTarget = target->isExtensible(); + ScopedProperty resultDesc(scope); + PropertyAttributes resultAttributes; + ObjectPrototype::toPropertyDescriptor(scope.engine, trapResult, resultDesc, &resultAttributes); + resultDesc->completed(&resultAttributes); + + if (!targetDesc->isCompatible(targetAttributes, resultDesc, resultAttributes)) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + + if (!resultAttributes.isConfigurable()) { + if (targetAttributes == Attr_Invalid || targetAttributes.isConfigurable()) { + scope.engine->throwTypeError(); + return Attr_Invalid; + } + } + + p->value = resultDesc->value; + p->set = resultDesc->set; + return resultAttributes; +} + +bool ProxyObject::virtualDefineOwnProperty(Managed *m, PropertyKey id, const Property *p, PropertyAttributes attrs) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) { + scope.engine->throwTypeError(); + return false; + } + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString prop(scope, scope.engine->newString(QStringLiteral("defineProperty"))); + ScopedValue trap(scope, handler->get(prop)); + if (scope.hasException()) + return false; + if (trap->isNullOrUndefined()) + return target->defineOwnProperty(id, p, attrs); + if (!trap->isFunctionObject()) { + scope.engine->throwTypeError(); + return false; + } + + JSCallData cdata(scope, 3, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = id.isArrayIndex() ? Value::fromUInt32(id.asArrayIndex()).toString(scope.engine) : id.asStringOrSymbol(); + cdata.args[2] = ObjectPrototype::fromPropertyDescriptor(scope.engine, p, attrs); + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + bool result = trapResult->toBoolean(); + if (!result) + return false; + + ScopedProperty targetDesc(scope); + PropertyAttributes targetAttributes = target->getOwnProperty(id, targetDesc); + bool extensibleTarget = target->isExtensible(); + bool settingConfigFalse = attrs.hasConfigurable() && !attrs.isConfigurable(); + if (targetAttributes == Attr_Invalid) { + if (!extensibleTarget || settingConfigFalse) { + scope.engine->throwTypeError(); + return false; + } + } else { + if (!targetDesc->isCompatible(targetAttributes, p, attrs)) { + scope.engine->throwTypeError(); + return false; + } + if (settingConfigFalse && targetAttributes.isConfigurable()) { + scope.engine->throwTypeError(); + return false; + } + } + + return true; +} + +bool ProxyObject::virtualIsExtensible(const Managed *m) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString hasProp(scope, scope.engine->newString(QStringLiteral("isExtensible"))); + ScopedValue trap(scope, handler->get(hasProp)); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->isExtensible(); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + JSCallData cdata(scope, 1, nullptr, handler); + cdata.args[0] = target; + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + bool result = trapResult->toBoolean(); + if (result != target->isExtensible()) { + scope.engine->throwTypeError(); + return false; + } + return result; +} + +bool ProxyObject::virtualPreventExtensions(Managed *m) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString hasProp(scope, scope.engine->newString(QStringLiteral("preventExtensions"))); + ScopedValue trap(scope, handler->get(hasProp)); + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->preventExtensions(); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + JSCallData cdata(scope, 1, nullptr, handler); + cdata.args[0] = target; + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + bool result = trapResult->toBoolean(); + if (result && target->isExtensible()) { + scope.engine->throwTypeError(); + return false; + } + return result; +} + +Heap::Object *ProxyObject::virtualGetPrototypeOf(const Managed *m) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) { + scope.engine->throwTypeError(); + return nullptr; + } + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString name(scope, scope.engine->newString(QStringLiteral("getPrototypeOf"))); + ScopedValue trap(scope, handler->get(name)); + if (scope.hasException()) + return nullptr; + if (trap->isNullOrUndefined()) + return target->getPrototypeOf(); + if (!trap->isFunctionObject()) { + scope.engine->throwTypeError(); + return nullptr; + } + + JSCallData cdata(scope, 1, nullptr, handler); + cdata.args[0] = target; + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + if (!trapResult->isNull() && !trapResult->isObject()) { + scope.engine->throwTypeError(); + return nullptr; + } + Heap::Object *proto = trapResult->isNull() ? nullptr : static_cast<Heap::Object *>(trapResult->heapObject()); + if (!target->isExtensible()) { + Heap::Object *targetProto = target->getPrototypeOf(); + if (proto != targetProto) { + scope.engine->throwTypeError(); + return nullptr; + } + } + return proto; +} + +bool ProxyObject::virtualSetPrototypeOf(Managed *m, const Object *p) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) { + scope.engine->throwTypeError(); + return false; + } + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString name(scope, scope.engine->newString(QStringLiteral("setPrototypeOf"))); + ScopedValue trap(scope, handler->get(name)); + if (scope.hasException()) + return false; + if (trap->isNullOrUndefined()) + return target->setPrototypeOf(p); + if (!trap->isFunctionObject()) { + scope.engine->throwTypeError(); + return false; + } + + JSCallData cdata(scope, 2, nullptr, handler); + cdata.args[0] = target; + cdata.args[1] = p ? p->asReturnedValue() : Encode::null(); + + ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + bool result = trapResult->toBoolean(); + if (!result) + return false; + if (!target->isExtensible()) { + Heap::Object *targetProto = target->getPrototypeOf(); + if (p->d() != targetProto) { + scope.engine->throwTypeError(); + return false; + } + } + return true; +} + +struct ProxyObjectOwnPropertyKeyIterator : OwnPropertyKeyIterator +{ + PersistentValue ownKeys; + uint index = 0; + uint len = 0; + + ProxyObjectOwnPropertyKeyIterator(ArrayObject *keys); + ~ProxyObjectOwnPropertyKeyIterator() override = default; + PropertyKey next(const Object *o, Property *pd = nullptr, PropertyAttributes *attrs = nullptr) override; + +}; + +ProxyObjectOwnPropertyKeyIterator::ProxyObjectOwnPropertyKeyIterator(ArrayObject *keys) +{ + ownKeys = keys; + len = keys->getLength(); +} + +PropertyKey ProxyObjectOwnPropertyKeyIterator::next(const Object *m, Property *pd, PropertyAttributes *attrs) +{ + if (index >= len) + return PropertyKey::invalid(); + + Scope scope(m); + ScopedObject keys(scope, ownKeys.asManaged()); + PropertyKey key = PropertyKey::fromId(keys->get(PropertyKey::fromArrayIndex(index))); + ++index; + + if (pd || attrs) { + ScopedProperty p(scope); + PropertyAttributes a = const_cast<Object *>(m)->getOwnProperty(key, pd ? pd : p); + if (attrs) + *attrs = a; + } + + return key; +} + +static bool removeAllOccurrences(ArrayObject *target, ReturnedValue val) { + uint len = target->getLength(); + bool found = false; + for (uint i = 0; i < len; ++i) { + ReturnedValue v = target->get(i); + if (v == val) { + found = true; + target->put(i, Value::undefinedValue()); + } + } + return found; +} + +OwnPropertyKeyIterator *ProxyObject::virtualOwnPropertyKeys(const Object *m, Value *iteratorTarget) +{ + Scope scope(m); + const ProxyObject *o = static_cast<const ProxyObject *>(m); + if (!o->d()->handler) { + scope.engine->throwTypeError(); + return nullptr; + } + + ScopedObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString name(scope, scope.engine->newString(QStringLiteral("ownKeys"))); + ScopedValue trap(scope, handler->get(name)); + + if (scope.hasException()) + return nullptr; + if (trap->isUndefined()) + return target->ownPropertyKeys(iteratorTarget); + if (!trap->isFunctionObject()) { + scope.engine->throwTypeError(); + return nullptr; + } + + JSCallData cdata(scope, 1, nullptr, handler); + cdata.args[0] = target; + ScopedObject trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata)); + if (!trapResult) { + scope.engine->throwTypeError(); + return nullptr; + } + + uint len = trapResult->getLength(); + ScopedArrayObject trapKeys(scope, scope.engine->newArrayObject()); + ScopedStringOrSymbol key(scope); + for (uint i = 0; i < len; ++i) { + key = trapResult->get(i); + if (scope.engine->hasException) + return nullptr; + if (!key) { + scope.engine->throwTypeError(); + return nullptr; + } + Value keyAsValue = Value::fromReturnedValue(key->toPropertyKey().id()); + trapKeys->push_back(keyAsValue); + } + + ScopedArrayObject targetConfigurableKeys(scope, scope.engine->newArrayObject()); + ScopedArrayObject targetNonConfigurableKeys(scope, scope.engine->newArrayObject()); + ObjectIterator it(scope, target, ObjectIterator::EnumerableOnly); + ScopedPropertyKey k(scope); + while (1) { + PropertyAttributes attrs; + k = it.next(nullptr, &attrs); + if (!k->isValid()) + break; + Value keyAsValue = Value::fromReturnedValue(k->id()); + if (attrs.isConfigurable()) + targetConfigurableKeys->push_back(keyAsValue); + else + targetNonConfigurableKeys->push_back(keyAsValue); + } + if (target->isExtensible() && targetNonConfigurableKeys->getLength() == 0) + return new ProxyObjectOwnPropertyKeyIterator(trapKeys); + + ScopedArrayObject uncheckedResultKeys(scope, scope.engine->newArrayObject()); + uncheckedResultKeys->copyArrayData(trapKeys); + + len = targetNonConfigurableKeys->getLength(); + for (uint i = 0; i < len; ++i) { + k = PropertyKey::fromId(targetNonConfigurableKeys->get(i)); + if (!removeAllOccurrences(uncheckedResultKeys, k->id())) { + scope.engine->throwTypeError(); + return nullptr; + } + } + + if (target->isExtensible()) + return new ProxyObjectOwnPropertyKeyIterator(trapKeys); + + len = targetConfigurableKeys->getLength(); + for (uint i = 0; i < len; ++i) { + k = PropertyKey::fromId(targetConfigurableKeys->get(i)); + if (!removeAllOccurrences(uncheckedResultKeys, k->id())) { + scope.engine->throwTypeError(); + return nullptr; + } + } + + len = uncheckedResultKeys->getLength(); + for (uint i = 0; i < len; ++i) { + if (uncheckedResultKeys->get(i) != Encode::undefined()) { + scope.engine->throwTypeError(); + return nullptr; + } + } + + *iteratorTarget = *m; + return new ProxyObjectOwnPropertyKeyIterator(trapKeys); +} + + +ReturnedValue ProxyFunctionObject::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *newTarget) +{ + Scope scope(f); + const ProxyObject *o = static_cast<const ProxyObject *>(f); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedFunctionObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString name(scope, scope.engine->newString(QStringLiteral("construct"))); + ScopedValue trap(scope, handler->get(name)); + + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) { + Q_ASSERT(target->isConstructor()); + return target->callAsConstructor(argv, argc, newTarget); + } + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + ScopedFunctionObject trapFunction(scope, trap); + Value *arguments = scope.alloc(3); + arguments[0] = target; + arguments[1] = scope.engine->newArrayObject(argv, argc); + arguments[2] = newTarget ? *newTarget : Value::undefinedValue(); + ScopedObject result(scope, trapFunction->call(handler, arguments, 3)); + + if (!result) + return scope.engine->throwTypeError(); + return result->asReturnedValue(); +} + +ReturnedValue ProxyFunctionObject::virtualCall(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc) +{ + Scope scope(f); + + const ProxyObject *o = static_cast<const ProxyObject *>(f); + if (!o->d()->handler) + return scope.engine->throwTypeError(); + + ScopedFunctionObject target(scope, o->d()->target); + Q_ASSERT(target); + ScopedObject handler(scope, o->d()->handler); + ScopedString name(scope, scope.engine->newString(QStringLiteral("apply"))); + ScopedValue trap(scope, handler->get(name)); + + if (scope.hasException()) + return Encode::undefined(); + if (trap->isNullOrUndefined()) + return target->call(thisObject, argv, argc); + if (!trap->isFunctionObject()) + return scope.engine->throwTypeError(); + + ScopedFunctionObject trapFunction(scope, trap); + Value *arguments = scope.alloc(3); + arguments[0] = target; + arguments[1] = thisObject ? *thisObject : Value::undefinedValue(); + arguments[2] = scope.engine->newArrayObject(argv, argc); + return trapFunction->call(handler, arguments, 3); +} + +DEFINE_OBJECT_VTABLE(Proxy); + +void Heap::Proxy::init(QV4::ExecutionContext *ctx) +{ + Heap::FunctionObject::init(ctx, QStringLiteral("Proxy")); + + Scope scope(ctx); + Scoped<QV4::Proxy> ctor(scope, this); + ctor->defineDefaultProperty(QStringLiteral("revocable"), QV4::Proxy::method_revocable, 2); + ctor->defineReadonlyConfigurableProperty(scope.engine->id_length(), Value::fromInt32(2)); +} + +ReturnedValue Proxy::virtualCallAsConstructor(const FunctionObject *f, const Value *argv, int argc, const Value *) +{ + Scope scope(f); + if (argc < 2 || !argv[0].isObject() || !argv[1].isObject()) + return scope.engine->throwTypeError(); + + const Object *target = static_cast<const Object *>(argv); + const Object *handler = static_cast<const Object *>(argv + 1); + if (const ProxyObject *ptarget = target->as<ProxyObject>()) + if (!ptarget->d()->handler) + return scope.engine->throwTypeError(); + if (const ProxyObject *phandler = handler->as<ProxyObject>()) + if (!phandler->d()->handler) + return scope.engine->throwTypeError(); + + const FunctionObject *targetFunction = target->as<FunctionObject>(); + if (targetFunction) + return scope.engine->memoryManager->allocate<ProxyFunctionObject>(targetFunction, handler)->asReturnedValue(); + return scope.engine->memoryManager->allocate<ProxyObject>(target, handler)->asReturnedValue(); +} + +ReturnedValue Proxy::virtualCall(const FunctionObject *f, const Value *, const Value *, int) +{ + return f->engine()->throwTypeError(); +} + +ReturnedValue Proxy::method_revocable(const FunctionObject *f, const Value *, const Value *argv, int argc) +{ + Scope scope(f); + ScopedObject proxy(scope, Proxy::virtualCallAsConstructor(f, argv, argc, f)); + if (scope.hasException()) + return Encode::undefined(); + Q_ASSERT(proxy); + + ScopedString revoke(scope, scope.engine->newString(QStringLiteral("revoke"))); + ScopedFunctionObject revoker(scope, scope.engine->memoryManager->allocate<FunctionObject>(scope.engine->rootContext(), nullptr, method_revoke)); + revoker->defineReadonlyConfigurableProperty(scope.engine->id_length(), Value::fromInt32(0)); + revoker->defineDefaultProperty(scope.engine->symbol_revokableProxy(), proxy); + + ScopedObject o(scope, scope.engine->newObject()); + ScopedString p(scope, scope.engine->newString(QStringLiteral("proxy"))); + o->defineDefaultProperty(p, proxy); + o->defineDefaultProperty(revoke, revoker); + return o->asReturnedValue(); +} + +ReturnedValue Proxy::method_revoke(const FunctionObject *f, const Value *, const Value *, int) +{ + Scope scope(f); + ScopedObject o(scope, f->get(scope.engine->symbol_revokableProxy())); + Q_ASSERT(o); + ProxyObject *proxy = o->cast<ProxyObject>(); + + proxy->d()->target.set(scope.engine, nullptr); + proxy->d()->handler.set(scope.engine, nullptr); + return Encode::undefined(); +} |