source: trunk/src/declarative/qml/qdeclarativevme_p.h

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** This file is part of the QtDeclarative module of the Qt Toolkit.
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#ifndef QDECLARATIVEVME_P_H
#define QDECLARATIVEVME_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 "qdeclarativeerror.h"
#include "private/qbitfield_p.h"

#include <QtCore/QString>
#include <QtCore/QStack>

QT_BEGIN_NAMESPACE

class QObject;
class QDeclarativeInstruction;
class QDeclarativeCompiledData;
class QDeclarativeCompiledData;
class QDeclarativeContextData;

template<typename T, int N = 128>
class QDeclarativeVMEStack {
public:
    QDeclarativeVMEStack() : index(-1), maxSize(N), data((T *)fixedData) {}
    ~QDeclarativeVMEStack() { if (data != (T *)fixedData) qFree(data); }

    bool isEmpty() const { return index == -1; }
    const T &top() const { return data[index]; }
    void push(const T &i) { ++index; if (index == maxSize) realloc(); data[index] = i; }
    const T &pop() { --index; return data[index + 1]; }
    int count() const { return index + 1; }
    const T &at(int idx) { return data[idx]; }

private:
    void realloc() {
        maxSize += N;
        if (data != (T *)fixedData) {
            data = (T*)qRealloc(data, maxSize * sizeof(T));
        } else {
            data = (T*)qMalloc(maxSize * sizeof(T));
        }
    }
    int index;
    int maxSize;
    T *data;
    char fixedData[N * sizeof(T)];
};

class QDeclarativeVME
{
public:
    QDeclarativeVME();

    QObject *run(QDeclarativeContextData *, QDeclarativeCompiledData *, 
                 int start = -1, int count = -1, 
                 const QBitField & = QBitField());
    void runDeferred(QObject *);

    bool isError() const;
    QList<QDeclarativeError> errors() const;

private:
    QObject *run(QDeclarativeVMEStack<QObject *> &, 
                 QDeclarativeContextData *, QDeclarativeCompiledData *, 
                 int start, int count, 
                 const QBitField &);
    QList<QDeclarativeError> vmeErrors;
};

QT_END_NAMESPACE

#endif // QDECLARATIVEVME_P_H