Alien-catch

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src/catch.hpp  view on Meta::CPAN

#include <cstdint>
#include <string>

namespace Catch {

    class BenchmarkLooper {

        std::string m_name;
        std::size_t m_count = 0;
        std::size_t m_iterationsToRun = 1;
        uint64_t m_resolution;
        Timer m_timer;

        static auto getResolution() -> uint64_t;
    public:
        // Keep most of this inline as it's on the code path that is being timed
        BenchmarkLooper( StringRef name )
        :   m_name( name ),
            m_resolution( getResolution() )
        {
            reportStart();
            m_timer.start();
        }

        explicit operator bool() {
            if( m_count < m_iterationsToRun )
                return true;
            return needsMoreIterations();
        }

        void increment() {
            ++m_count;
        }

        void reportStart();
        auto needsMoreIterations() -> bool;

src/catch.hpp  view on Meta::CPAN

        TestRunInfo runInfo;
        Totals totals;
        bool aborting;
    };

    struct BenchmarkInfo {
        std::string name;
    };
    struct BenchmarkStats {
        BenchmarkInfo info;
        std::size_t iterations;
        uint64_t elapsedTimeInNanoseconds;
    };

    struct IStreamingReporter {
        virtual ~IStreamingReporter() = default;

        // Implementing class must also provide the following static methods:
        // static std::string getDescription();
        // static std::set<Verbosity> getSupportedVerbosities()

src/catch.hpp  view on Meta::CPAN

    auto BenchmarkLooper::getResolution() -> uint64_t {
        return getEstimatedClockResolution() * getCurrentContext().getConfig()->benchmarkResolutionMultiple();
    }

    void BenchmarkLooper::reportStart() {
        getResultCapture().benchmarkStarting( { m_name } );
    }
    auto BenchmarkLooper::needsMoreIterations() -> bool {
        auto elapsed = m_timer.getElapsedNanoseconds();

        // Exponentially increasing iterations until we're confident in our timer resolution
        if( elapsed < m_resolution ) {
            m_iterationsToRun *= 10;
            return true;
        }

        getResultCapture().benchmarkEnded( { { m_name }, m_count, elapsed } );
        return false;
    }

} // end namespace Catch
// end catch_benchmark.cpp
// start catch_capture_matchers.cpp

src/catch.hpp  view on Meta::CPAN

namespace Catch {

    auto getCurrentNanosecondsSinceEpoch() -> uint64_t {
        return std::chrono::duration_cast<std::chrono::nanoseconds>( std::chrono::high_resolution_clock::now().time_since_epoch() ).count();
    }

    namespace {
        auto estimateClockResolution() -> uint64_t {
            uint64_t sum = 0;
            static const uint64_t iterations = 1000000;

            auto startTime = getCurrentNanosecondsSinceEpoch();

            for( std::size_t i = 0; i < iterations; ++i ) {

                uint64_t ticks;
                uint64_t baseTicks = getCurrentNanosecondsSinceEpoch();
                do {
                    ticks = getCurrentNanosecondsSinceEpoch();
                } while( ticks == baseTicks );

                auto delta = ticks - baseTicks;
                sum += delta;

                // If we have been calibrating for over 3 seconds -- the clock
                // is terrible and we should move on.
                // TBD: How to signal that the measured resolution is probably wrong?
                if (ticks > startTime + 3 * nanosecondsInSecond) {
                    return sum / i;
                }
            }

            // We're just taking the mean, here. To do better we could take the std. dev and exclude outliers
            // - and potentially do more iterations if there's a high variance.
            return sum/iterations;
        }
    }
    auto getEstimatedClockResolution() -> uint64_t {
        static auto s_resolution = estimateClockResolution();
        return s_resolution;
    }

    void Timer::start() {
       m_nanoseconds = getCurrentNanosecondsSinceEpoch();
    }

src/catch.hpp  view on Meta::CPAN

    for (auto line : nameCol) {
        if (!firstLine)
            (*m_tablePrinter) << ColumnBreak() << ColumnBreak() << ColumnBreak();
        else
            firstLine = false;

        (*m_tablePrinter) << line << ColumnBreak();
    }
}
void ConsoleReporter::benchmarkEnded(BenchmarkStats const& stats) {
    Duration average(stats.elapsedTimeInNanoseconds / stats.iterations);
    (*m_tablePrinter)
        << stats.iterations << ColumnBreak()
        << stats.elapsedTimeInNanoseconds << ColumnBreak()
        << average << ColumnBreak();
}

void ConsoleReporter::testCaseEnded(TestCaseStats const& _testCaseStats) {
    m_tablePrinter->close();
    StreamingReporterBase::testCaseEnded(_testCaseStats);
    m_headerPrinted = false;
}
void ConsoleReporter::testGroupEnded(TestGroupStats const& _testGroupStats) {