tst_bench_qstringbuilder.cpp

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**
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** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite module of the Qt Toolkit.
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// Select one of the scenarios below
#define SCENARIO 1
 
#if SCENARIO == 1
// this is the "no harm done" version. Only operator% is active,
// with NO_CAST * defined
#undef QT_USE_FAST_OPERATOR_PLUS
#undef QT_USE_FAST_CONCATENATION
#define QT_NO_CAST_FROM_ASCII
#define QT_NO_CAST_TO_ASCII
#endif
 
 
#if SCENARIO == 2
// this is the "full" version. Operator+ is replaced by a QStringBuilder
// based version
// with NO_CAST * defined
#define QT_USE_FAST_OPERATOR_PLUS
#define QT_USE_FAST_CONCATENATION
#define QT_NO_CAST_FROM_ASCII
#define QT_NO_CAST_TO_ASCII
#endif
 
#if SCENARIO == 3
// this is the "no harm done" version. Only operator% is active,
// with NO_CAST * _not_ defined
#undef QT_USE_FAST_OPERATOR_PLUS
#undef QT_USE_FAST_CONCATENATION
#undef QT_NO_CAST_FROM_ASCII
#undef QT_NO_CAST_TO_ASCII
#endif
 
#if SCENARIO == 4
// this is the "full" version. Operator+ is replaced by a QStringBuilder
// based version
// with NO_CAST * _not_ defined
#define QT_USE_FAST_OPERATOR_PLUS
#define QT_USE_FAST_CONCATENATION
#undef QT_NO_CAST_FROM_ASCII
#undef QT_NO_CAST_TO_ASCII
#endif
 
 
#include <qbytearray.h>
#include <qdebug.h>
#include <qstring.h>
#include <qstringbuilder.h>
 
#include <qtest.h>
 
#include <string>
 
// Select one of the scenarios below
#if SCENARIO == 1
#define P %
#elif SCENARIO == 2
#define P +
#elif SCENARIO == 3
#define P %
#elif SCENARIO == 4
#define P +
#endif
 
#define COMPARE(a, b) QCOMPARE(a, b)
//#define COMPARE(a, b)
 
#define SEP(s) qDebug() << "\n\n-------- " s "  ---------";
 
#define LITERAL "some string literal"
 
class tst_QStringBuilder : public QObject
{
    Q_OBJECT
 
public:
    tst_QStringBuilder()
      : l1literal(LITERAL),
        l1string(LITERAL),
        ba(LITERAL),
        string(l1string),
        stdstring(LITERAL),
        achar('c'),
        r2(QLatin1String(LITERAL LITERAL)),
        r3(QLatin1String(LITERAL LITERAL LITERAL)),
        r4(QLatin1String(LITERAL LITERAL LITERAL LITERAL)),
        r5(QLatin1String(LITERAL LITERAL LITERAL LITERAL LITERAL))
    {}
 
 
public:
    enum { N = 10000 };
 
    int run_traditional()
    {
        int s = 0;
        for (int i = 0; i < N; ++i) {
#if 0
            s += QString(l1string + l1string).size();
            s += QString(l1string + l1string + l1string).size();
            s += QString(l1string + l1string + l1string + l1string).size();
            s += QString(l1string + l1string + l1string + l1string + l1string).size();
#endif
            s += QString(achar + l1string + achar).size();
        }
        return s;
    }
 
    int run_builder()
    {
        int s = 0;
        for (int i = 0; i < N; ++i) {
#if 0
            s += QString(l1literal P l1literal).size();
            s += QString(l1literal P l1literal P l1literal).size();
            s += QString(l1literal P l1literal P l1literal P l1literal).size();
            s += QString(l1literal P l1literal P l1literal P l1literal P l1literal).size();
#endif
            s += QString(achar % l1literal % achar).size();
        }
        return s;
    }
 
private slots:
 
    void separator_0() {
        qDebug() << "\nIn each block the QStringBuilder based result appear first "
            "(with a 'b_' prefix), QStringBased second ('q_' prefix), std::string "
            "last ('s_' prefix)\n";
    }
 
    void separator_1() { SEP("literal + literal  (builder first)"); }
 
    void b_2_l1literal() {
        QBENCHMARK { r = l1literal P l1literal; }
        COMPARE(r, r2);
    }
    #ifndef QT_NO_CAST_FROM_ASCII
    void b_l1literal_LITERAL() {
        QBENCHMARK { r = l1literal P LITERAL; }
        COMPARE(r, r2);
    }
    #endif
    void q_2_l1string() {
        QBENCHMARK { r = l1string + l1string; }
        COMPARE(r, r2);
    }
 
 
    void separator_2() { SEP("2 strings"); }
 
    void b_2_string() {
        QBENCHMARK { r = string P string; }
        COMPARE(r, r2);
    }
    void q_2_string() {
        QBENCHMARK { r = string + string; }
        COMPARE(r, r2);
    }
    void s_2_string() {
        QBENCHMARK { stdr = stdstring + stdstring; }
        COMPARE(stdr, stdstring + stdstring);
    }
 
 
    void separator_2b() { SEP("3 strings"); }
 
    void b_3_string() {
        QBENCHMARK { r = string P string P string; }
        COMPARE(r, r3);
    }
    void q_3_string() {
        QBENCHMARK { r = string + string + string; }
        COMPARE(r, r3);
    }
    void s_3_string() {
        QBENCHMARK { stdr = stdstring + stdstring + stdstring; }
        COMPARE(stdr, stdstring + stdstring + stdstring);
    }
 
    void separator_2e() { SEP("4 strings"); }
 
    void b_4_string() {
        QBENCHMARK { r = string P string P string P string; }
        COMPARE(r, r4);
    }
    void q_4_string() {
        QBENCHMARK { r = string + string + string + string; }
        COMPARE(r, r4);
    }
    void s_4_string() {
        QBENCHMARK { stdr = stdstring + stdstring + stdstring + stdstring; }
        COMPARE(stdr, stdstring + stdstring + stdstring + stdstring);
    }
 
 
 
    void separator_2a() { SEP("string + literal  (builder first)"); }
 
    void b_string_l1literal() {
        QBENCHMARK { r = string % l1literal; }
        COMPARE(r, r2);
    }
    #ifndef QT_NO_CAST_FROM_ASCII
    void b_string_LITERAL() {
        QBENCHMARK { r = string P LITERAL; }
        COMPARE(r, r2);
    }
    void b_LITERAL_string() {
        QBENCHMARK { r = LITERAL P string; }
        COMPARE(r, r2);
    }
    #endif
    void b_string_l1string() {
        QBENCHMARK { r = string P l1string; }
        COMPARE(r, r2);
    }
    void q_string_l1literal() {
        QBENCHMARK { r = string + l1string; }
        COMPARE(r, r2);
    }
    void q_string_l1string() {
        QBENCHMARK { r = string + l1string; }
        COMPARE(r, r2);
    }
    void s_LITERAL_string() {
        QBENCHMARK { stdr = LITERAL + stdstring; }
        COMPARE(stdr, stdstring + stdstring);
    }
 
 
    void separator_3() { SEP("3 literals"); }
 
    void b_3_l1literal() {
        QBENCHMARK { r = l1literal P l1literal P l1literal; }
        COMPARE(r, r3);
    }
    void q_3_l1string() {
        QBENCHMARK { r = l1string + l1string + l1string; }
        COMPARE(r, r3);
    }
    void s_3_l1string() {
        QBENCHMARK { stdr = stdstring + LITERAL + LITERAL; }
        COMPARE(stdr, stdstring + stdstring + stdstring);
    }
 
 
    void separator_4() { SEP("4 literals"); }
 
    void b_4_l1literal() {
        QBENCHMARK { r = l1literal P l1literal P l1literal P l1literal; }
        COMPARE(r, r4);
    }
    void q_4_l1string() {
        QBENCHMARK { r = l1string + l1string + l1string + l1string; }
        COMPARE(r, r4);
    }
 
 
    void separator_5() { SEP("5 literals"); }
 
    void b_5_l1literal() {
        QBENCHMARK { r = l1literal P l1literal P l1literal P l1literal P l1literal; }
        COMPARE(r, r5);
    }
 
    void q_5_l1string() {
        QBENCHMARK { r = l1string + l1string + l1string + l1string + l1string; }
        COMPARE(r, r5);
    }
 
 
    void separator_6() { SEP("4 chars"); }
 
    void b_string_4_char() {
        QBENCHMARK { r = string + achar + achar + achar + achar; }
        COMPARE(r, QString(string P achar P achar P achar P achar));
    }
 
    void q_string_4_char() {
        QBENCHMARK { r = string + achar + achar + achar + achar; }
        COMPARE(r, QString(string P achar P achar P achar P achar));
    }
 
    void s_string_4_char() {
        QBENCHMARK { stdr = stdstring + 'c' + 'c' + 'c' + 'c'; }
        COMPARE(stdr, stdstring + 'c' + 'c' + 'c' + 'c');
    }
 
 
    void separator_7() { SEP("char + string + char"); }
 
    void b_char_string_char() {
        QBENCHMARK { r = achar + string + achar; }
        COMPARE(r, QString(achar P string P achar));
    }
 
    void q_char_string_char() {
        QBENCHMARK { r = achar + string + achar; }
        COMPARE(r, QString(achar P string P achar));
    }
 
    void s_char_string_char() {
        QBENCHMARK { stdr = 'c' + stdstring + 'c'; }
        COMPARE(stdr, 'c' + stdstring + 'c');
    }
 
 
    void separator_8() { SEP("string.arg"); }
 
    void b_string_arg() {
        const QString pattern = l1string + QString::fromLatin1("%1") + l1string;
        QBENCHMARK { r = l1literal P string P l1literal; }
        COMPARE(r, r3);
    }
 
    void q_string_arg() {
        const QString pattern = l1string + QLatin1String("%1") + l1string;
        QBENCHMARK { r = pattern.arg(string); }
        COMPARE(r, r3);
    }
 
    void q_bytearray_arg() {
        QByteArray result;
        QBENCHMARK { result = ba + ba + ba; }
    }
 
 
    void separator_9() { SEP("QString::reserve()"); }
 
    void b_reserve() {
        QBENCHMARK {
            r.clear();
            r = string P string P string P string;
        }
        COMPARE(r, r4);
    }
    void b_reserve_lit() {
        QBENCHMARK {
            r.clear();
            r = string P l1literal P string P string;
        }
        COMPARE(r, r4);
    }
    void s_reserve() {
        QBENCHMARK {
            r.clear();
            r.reserve(string.size() + string.size() + string.size() + string.size());
            r += string;
            r += string;
            r += string;
            r += string;
        }
        COMPARE(r, r4);
    }
    void s_reserve_lit() {
        QBENCHMARK {
            r.clear();
            //r.reserve(string.size() + qstrlen(l1string.latin1())
            //    + string.size() + string.size());
            r.reserve(1024);
            r += string;
            r += l1string;
            r += string;
            r += string;
        }
        COMPARE(r, r4);
    }
 
private:
    const QLatin1String l1literal;
    const QLatin1String l1string;
    const QByteArray ba;
    const QString string;
    const std::string stdstring;
    const QLatin1Char achar;
    const QString r2, r3, r4, r5;
 
    // short cuts for results
    QString r;
    std::string stdr;
};
 
#undef P
 
QTEST_MAIN(tst_QStringBuilder)
 
#include "tst_bench_qstringbuilder.moc"