/****************************************************************************
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** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** 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
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** 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
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#ifndef QV4ENGINEBASE_P_H
#define QV4ENGINEBASE_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/qv4global_p.h>
#include <private/qv4runtimeapi_p.h>

QT_BEGIN_NAMESPACE

namespace QV4 {

// Base class for the execution engine

#if defined(Q_CC_MSVC) || defined(Q_CC_GNU)
#pragma pack(push, 1)
#endif
struct EngineBase {
    Heap::ExecutionContext *current = 0;

    Value *jsStackTop = 0;
    quint8 hasException = false;
    quint8 writeBarrierActive = false;
    quint16 unused = 0;
#if QT_POINTER_SIZE == 8
    quint8 padding[4];
#endif
    MemoryManager *memoryManager = 0;
    Runtime runtime;

    qint32 callDepth = 0;
    Value *jsStackLimit = 0;
    Value *jsStackBase = 0;

    ExecutionContext *currentContext = 0;
    IdentifierTable *identifierTable = 0;
    Object *globalObject = 0;

    enum {
        Class_Empty,
        Class_String,
        Class_MemberData,
        Class_SimpleArrayData,
        Class_SparseArrayData,
        Class_ExecutionContext,
        Class_SimpleCallContext,
        Class_Object,
        Class_ArrayObject,
        Class_FunctionObject,
        Class_StringObject,
        Class_ScriptFunction,
        Class_BuiltinFunction,
        Class_ObjectProto,
        Class_RegExp,
        Class_RegExpObject,
        Class_RegExpExecArray,
        Class_ArgumentsObject,
        Class_StrictArgumentsObject,
        Class_ErrorObject,
        Class_ErrorObjectWithMessage,
        Class_ErrorProto,
        NClasses
    };
    InternalClass *internalClasses[NClasses];
};
#if defined(Q_CC_MSVC) || defined(Q_CC_GNU)
#pragma pack(pop)
#endif

Q_STATIC_ASSERT(std::is_standard_layout<EngineBase>::value);
Q_STATIC_ASSERT(offsetof(EngineBase, current) == 0);
Q_STATIC_ASSERT(offsetof(EngineBase, jsStackTop) == offsetof(EngineBase, current) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(offsetof(EngineBase, hasException) == offsetof(EngineBase, jsStackTop) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(offsetof(EngineBase, memoryManager) == offsetof(EngineBase, hasException) + QT_POINTER_SIZE);
Q_STATIC_ASSERT(offsetof(EngineBase, runtime) == offsetof(EngineBase, memoryManager) + QT_POINTER_SIZE);

}

QT_END_NAMESPACE

#endif
