Partial Proxy support

get, set and deleteProperty proxying is implemented,
the others require some more changes in our engine.

Change-Id: I4dd4b154b1a582f5e36cdc9429fa049fd37d5167
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 270 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4proxy.cpp b/src/qml/jsruntime/qv4proxy.cpp
new file mode 100644
index 0000000000..b34af97870
--- /dev/null
+++ b/src/qml/jsruntime/qv4proxy.cpp
@@ -0,0 +1,270 @@
+/****************************************************************************
+**
+** 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"
+
+using namespace QV4;
+
+DEFINE_OBJECT_VTABLE(ProxyObject);
+
+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());
+}
+
+ReturnedValue ProxyObject::get(const Managed *m, StringOrSymbol *name, 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->isUndefined())
+        return target->get(name, 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] = name;
+    cdata.args[2] = o->d(); // ### fix receiver handling
+
+    ScopedValue trapResult(scope, static_cast<const FunctionObject *>(trap.ptr)->call(cdata));
+    ScopedProperty targetDesc(scope);
+    PropertyAttributes attributes;
+    target->getOwnProperty(name, &attributes, 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();
+}
+
+ReturnedValue ProxyObject::getIndexed(const Managed *m, uint index, bool *hasProperty)
+{
+    Scope scope(m);
+    ScopedString name(scope, Primitive::fromUInt32(index).toString(scope.engine));
+    return get(m, name, hasProperty);
+}
+
+bool ProxyObject::put(Managed *m, StringOrSymbol *name, const Value &value)
+{
+    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->isUndefined())
+        return target->put(name, value);
+    if (!trap->isFunctionObject())
+        return scope.engine->throwTypeError();
+
+    JSCallData cdata(scope, 4, nullptr, handler);
+    cdata.args[0] = target;
+    cdata.args[1] = name;
+    cdata.args[2] = value;
+    cdata.args[3] = 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(name, &attributes, 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::putIndexed(Managed *m, uint index, const Value &value)
+{
+    Scope scope(m);
+    ScopedString name(scope, Primitive::fromUInt32(index).toString(scope.engine));
+    return put(m, name, value);
+}
+
+bool ProxyObject::deleteProperty(Managed *m, StringOrSymbol *name)
+{
+    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->isUndefined())
+        return target->deleteProperty(name);
+    if (!trap->isFunctionObject())
+        return scope.engine->throwTypeError();
+
+    JSCallData cdata(scope, 3, nullptr, handler);
+    cdata.args[0] = target;
+    cdata.args[1] = name;
+    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(name, &attributes, targetDesc);
+    if (attributes == Attr_Invalid)
+        return true;
+    if (!attributes.isConfigurable())
+        return scope.engine->throwTypeError();
+    return true;
+}
+
+bool ProxyObject::deleteIndexedProperty(Managed *m, uint index)
+{
+    Scope scope(m);
+    ScopedString name(scope, Primitive::fromUInt32(index).toString(scope.engine));
+    return deleteProperty(m, name);
+}
+
+//ReturnedValue ProxyObject::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
+//{
+
+//}
+
+//ReturnedValue ProxyObject::call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc)
+//{
+
+//}
+
+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);
+}
+
+ReturnedValue Proxy::callAsConstructor(const FunctionObject *f, const Value *argv, int argc)
+{
+    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();
+
+    ScopedObject o(scope, scope.engine->memoryManager->allocate<ProxyObject>(target, handler));
+    return o->asReturnedValue();
+}
+
+ReturnedValue Proxy::call(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::callAsConstructor(f, argv, argc));
+    if (scope.hasException())
+        return Encode::undefined();
+
+    ScopedString revoke(scope, scope.engine->newString(QStringLiteral("revoke")));
+    ScopedFunctionObject revoker(scope, createBuiltinFunction(scope.engine, revoke, method_revoke, 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);
+    Scoped<ProxyObject> proxy(scope, f->get(scope.engine->symbol_revokableProxy()));
+    Q_ASSERT(proxy);
+
+    proxy->d()->target.set(scope.engine, nullptr);
+    proxy->d()->handler.set(scope.engine, nullptr);
+    return Encode::undefined();
+}