Partial Symbol support

Added basic infrastructure to create symbols and convert them
back to strings. In addition, storing and retrieving of symbol
based properties in Objects works.

Change-Id: I185f7aa46e7afa19db5a801102142892e03b7bf1
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 116 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4symbol.cpp b/src/qml/jsruntime/qv4symbol.cpp
new file mode 100644
index 0000000000..82602c7cf2
--- /dev/null
+++ b/src/qml/jsruntime/qv4symbol.cpp
@@ -0,0 +1,116 @@
+/****************************************************************************
+**
+** 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 <qv4symbol_p.h>
+#include <qv4functionobject_p.h>
+
+using namespace QV4;
+
+DEFINE_OBJECT_VTABLE(SymbolCtor);
+DEFINE_MANAGED_VTABLE(Symbol);
+
+void Heap::Symbol::init(Heap::String *description)
+{
+    identifier = Identifier::fromHeapObject(this);
+    QString desc = description->toQString();
+    text = desc.data_ptr();
+    text->ref.ref();
+}
+
+void Heap::SymbolCtor::init(QV4::ExecutionContext *scope)
+{
+    Heap::FunctionObject::init(scope, QStringLiteral("Symbol"));
+}
+
+ReturnedValue QV4::SymbolCtor::call(const QV4::FunctionObject *f, const QV4::Value *, const QV4::Value *argv, int argc)
+{
+    Scope scope(f);
+    ScopedString s(scope);
+    if (argc)
+        s = argv[0].toString(scope.engine);
+    if (scope.hasException())
+        return Encode::undefined();
+    return f->engine()->memoryManager->alloc<Symbol>(s->d())->asReturnedValue();
+}
+
+ReturnedValue SymbolCtor::method_for(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc)
+{
+//    Scope scope(f);
+//    ScopedValue k(s, argc ? argv[0]: Encode::undefined());
+//    ScopedString key(scope, k->toString(scope.engine));
+//    CHECK_EXCEPTION();
+}
+
+ReturnedValue SymbolCtor::method_keyFor(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc)
+{
+}
+
+void SymbolPrototype::init(ExecutionEngine *engine, Object *ctor)
+{
+    Scope scope(engine);
+    ScopedValue v(scope);
+    ctor->defineReadonlyProperty(engine->id_prototype(), (v = this));
+
+    defineDefaultProperty(QStringLiteral("toString"), method_toString);
+    defineDefaultProperty(QStringLiteral("valueOf"), method_valueOf);
+}
+
+ReturnedValue SymbolPrototype::method_toString(const FunctionObject *f, const Value *thisObject, const Value *, int)
+{
+    ExecutionEngine *e = f->engine();
+    const Symbol *s = thisObject->as<Symbol>();
+    if (!s)
+        return e->throwTypeError();
+    return e->newString(s->descriptiveString())->asReturnedValue();
+}
+
+ReturnedValue SymbolPrototype::method_valueOf(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc)
+{
+    const Symbol *s = thisObject->as<Symbol>();
+    if (!s) {
+        ExecutionEngine *e = f->engine();
+        return e->throwTypeError();
+    }
+    return s->asReturnedValue();
+}
+
+QString Symbol::descriptiveString() const
+{
+    return QLatin1String("Symbol(") + toQString() + QLatin1String(")");
+}