Add Generator support

Add support for ES6 generators. Those are currently
always executed in the interpreter (we never JIT them),
to simplify the initial implementation.

Most functionality, except for 'yield *' expressions
are supported. 'yield *' will have to wait until we
support for(... of ...)

Change-Id: I7c059d1e3b301cbcb79e3746b4bec346738fd426
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>

1 files changed, 136 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4generatorobject_p.h b/src/qml/jsruntime/qv4generatorobject_p.h
new file mode 100644
index 0000000000..62ffcbbad1
--- /dev/null
+++ b/src/qml/jsruntime/qv4generatorobject_p.h
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QV4GENERATOROBJECT_P_H
+#define QV4GENERATOROBJECT_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "qv4functionobject_p.h"
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+
+enum class GeneratorState {
+    Undefined,
+    SuspendedStart,
+    SuspendedYield,
+    Executing,
+    Completed
+};
+
+namespace Heap {
+
+struct GeneratorFunctionCtor : FunctionObject {
+    void init(QV4::ExecutionContext *scope);
+};
+
+struct GeneratorFunction : ScriptFunction {
+};
+
+struct GeneratorPrototype : FunctionObject {
+    void init();
+};
+
+#define GeneratorObjectMembers(class, Member) \
+    Member(class, Pointer, ExecutionContext *, context) \
+    Member(class, Pointer, GeneratorFunction *, function) \
+    Member(class, NoMark, GeneratorState, state) \
+    Member(class, NoMark, CppStackFrame, cppFrame) \
+    Member(class, ValueArray, ValueArray, stack)
+
+DECLARE_HEAP_OBJECT(GeneratorObject, Object) {
+    DECLARE_MARKOBJECTS(GeneratorObject);
+};
+
+}
+
+struct GeneratorFunctionCtor : FunctionCtor
+{
+    V4_OBJECT2(GeneratorFunctionCtor, FunctionCtor)
+
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
+};
+
+struct GeneratorFunction : ScriptFunction
+{
+    V4_OBJECT2(GeneratorFunction, ScriptFunction)
+    V4_INTERNALCLASS(GeneratorFunction)
+
+    static Heap::FunctionObject *create(ExecutionContext *scope, Function *function);
+    static ReturnedValue callAsConstructor(const FunctionObject *f, const Value *argv, int argc);
+    static ReturnedValue call(const FunctionObject *f, const Value *thisObject, const Value *argv, int argc);
+};
+
+struct GeneratorPrototype : Object
+{
+    void init(ExecutionEngine *engine, Object *ctor);
+
+    static ReturnedValue method_next(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_return(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+    static ReturnedValue method_throw(const FunctionObject *, const Value *thisObject, const Value *argv, int argc);
+};
+
+
+struct GeneratorObject : Object {
+    V4_OBJECT2(GeneratorObject, Object)
+    Q_MANAGED_TYPE(GeneratorObject)
+    V4_INTERNALCLASS(GeneratorObject)
+    V4_PROTOTYPE(generatorPrototype)
+
+    ReturnedValue resume(ExecutionEngine *engine, const Value &arg) const;
+};
+
+}
+
+QT_END_NAMESPACE
+
+#endif // QV4GENERATORFUNCTION_P_H
+