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+/****************************************************************************
+**
+** 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 QV4GRAPH_P_H
+#define QV4GRAPH_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 <private/qqmljsmemorypool_p.h>
+#include <private/qv4global_p.h>
+#include <private/qv4node_p.h>
+
+#include <array>
+
+QT_REQUIRE_CONFIG(qml_tracing);
+
+QT_BEGIN_NAMESPACE
+
+namespace QV4 {
+namespace IR {
+
+class Function;
+class Operation;
+class OperationBuilder;
+
+class Graph final
+{
+    Q_DISABLE_COPY_MOVE(Graph)
+
+public:
+    using MemoryPool = QQmlJS::MemoryPool;
+
+public:
+    static Graph *create(Function *function);
+    ~Graph() = delete;
+
+    MemoryPool *pool() const;
+    OperationBuilder *opBuilder() const
+    { return m_opBuilder; }
+
+    Node *createNode(const Operation *op, Node * const operands[] = nullptr, size_t opCount = 0,
+                     bool incomplete = false);
+    template <typename... Nodes>
+    Node *createNode(Operation *op, Nodes*... nodes) {
+        std::array<Node *, sizeof...(nodes)> nodesArray {{ nodes... }};
+        return createNode(op, nodesArray.data(), nodesArray.size());
+    }
+    Node *createConstantBoolNode(bool value);
+    Node *createConstantIntNode(int value);
+    Node *createConstantHeapNode(Heap::Base *heap);
+
+    Node *undefinedNode() const { return m_undefinedNode; }
+    Node *emptyNode() const { return m_emptyNode; }
+    Node *nullNode() const { return m_nullNode; }
+    Node *trueConstant() const { return m_trueNode; }
+    Node *falseConstant() const { return m_falseNode; }
+
+    Node *startNode() const { return m_startNode; }
+    Node *engineNode() const { return m_engineNode; }
+    Node *functionNode() const { return m_functionNode; }
+    Node *cppFrameNode() const { return m_cppFrameNode; }
+    Node *endNode() const { return m_endNode; }
+    Node *initialFrameState() const { return m_initialFrameState; }
+    void setStartNode(Node *n) { m_startNode = n; }
+    void setEngineNode(Node *n) { m_engineNode = n; }
+    void setFunctionNode(Node *n) { m_functionNode = n; }
+    void setCppFrameNode(Node *n) { m_cppFrameNode = n; }
+    void setEndNode(Node *n) { m_endNode = n; }
+    void setInitialFrameState(Node *n) { m_initialFrameState = n; }
+
+    unsigned nodeCount() const
+    { return unsigned(m_nextNodeId); }
+
+    void addEndInput(Node *n);
+
+private: // types and methods
+    Graph(Function *function);
+
+private: // fields
+    Function *m_function;
+    OperationBuilder *m_opBuilder;
+    Node::Id m_nextNodeId = 0;
+    Node *m_undefinedNode = nullptr;
+    Node *m_emptyNode = nullptr;
+    Node *m_nullNode = nullptr;
+    Node *m_trueNode = nullptr;
+    Node *m_falseNode = nullptr;
+    Node *m_startNode = nullptr;
+    Node *m_engineNode = nullptr;
+    Node *m_functionNode = nullptr;
+    Node *m_cppFrameNode = nullptr;
+    Node *m_endNode = nullptr;
+    Node *m_initialFrameState = nullptr;
+};
+
+} // namespace IR
+} // namespace QV4
+
+QT_END_NAMESPACE
+
+#endif // QV4GRAPH_P_H