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** Copyright (C) 2016 The Qt Company Ltd.
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** Alternatively, this file may be used under the terms of the GNU
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#ifndef QV4FUNCTION_H
#define QV4FUNCTION_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 <stdint.h>
#include "qv4global_p.h"
#include <private/qqmlglobal_p.h>
#include <private/qv4compileddata_p.h>
#include <private/qv4context_p.h>

QT_BEGIN_NAMESPACE

namespace QV4 {

struct Q_QML_EXPORT Function {
    const CompiledData::Function *compiledFunction;
    CompiledData::CompilationUnit *compilationUnit;

    ReturnedValue (*code)(ExecutionEngine *, const uchar *);
    const uchar *codeData;

    // first nArguments names in internalClass are the actual arguments
    InternalClass *internalClass;
    uint nFormals;
    bool activationRequired;
    bool hasQmlDependencies;
    bool canUseSimpleCall;

    Function(ExecutionEngine *engine, CompiledData::CompilationUnit *unit, const CompiledData::Function *function,
             ReturnedValue (*codePtr)(ExecutionEngine *, const uchar *));
    ~Function();

    // used when dynamically assigning signal handlers (QQmlConnection)
    void updateInternalClass(ExecutionEngine *engine, const QList<QByteArray> &parameters);

    inline Heap::String *name() {
        return compilationUnit->runtimeStrings[compiledFunction->nameIndex];
    }
    inline QString sourceFile() const { return compilationUnit->fileName(); }
    inline QUrl finalUrl() const { return compilationUnit->finalUrl(); }

    inline bool usesArgumentsObject() const { return compiledFunction->flags & CompiledData::Function::UsesArgumentsObject; }
    inline bool isStrict() const { return compiledFunction->flags & CompiledData::Function::IsStrict; }
    inline bool isNamedExpression() const { return compiledFunction->flags & CompiledData::Function::IsNamedExpression; }

    inline bool needsActivation() const
    { return activationRequired; }

    inline bool canUseSimpleFunction() const { return canUseSimpleCall; }

    QQmlSourceLocation sourceLocation() const
    {
        return QQmlSourceLocation(sourceFile(), compiledFunction->location.line, compiledFunction->location.column);
    }

    Function *nestedFunction() const
    {
        if (compiledFunction->nestedFunctionIndex == std::numeric_limits<uint32_t>::max())
            return nullptr;
        return compilationUnit->runtimeFunctions[compiledFunction->nestedFunctionIndex];
    }
};


inline unsigned int Heap::CallContext::formalParameterCount() const
{
    return v4Function ? v4Function->nFormals : 0;
}


}

QT_END_NAMESPACE

#endif