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Diffstat (limited to 'utils/google-benchmark/include/benchmark/benchmark_api.h')
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diff --git a/utils/google-benchmark/include/benchmark/benchmark_api.h b/utils/google-benchmark/include/benchmark/benchmark_api.h new file mode 100644 index 0000000000000..28baa587a9e1a --- /dev/null +++ b/utils/google-benchmark/include/benchmark/benchmark_api.h @@ -0,0 +1,864 @@ +// Support for registering benchmarks for functions. + +/* Example usage: +// Define a function that executes the code to be measured a +// specified number of times: +static void BM_StringCreation(benchmark::State& state) { + while (state.KeepRunning()) + std::string empty_string; +} + +// Register the function as a benchmark +BENCHMARK(BM_StringCreation); + +// Define another benchmark +static void BM_StringCopy(benchmark::State& state) { + std::string x = "hello"; + while (state.KeepRunning()) + std::string copy(x); +} +BENCHMARK(BM_StringCopy); + +// Augment the main() program to invoke benchmarks if specified +// via the --benchmarks command line flag. E.g., +// my_unittest --benchmark_filter=all +// my_unittest --benchmark_filter=BM_StringCreation +// my_unittest --benchmark_filter=String +// my_unittest --benchmark_filter='Copy|Creation' +int main(int argc, char** argv) { + benchmark::Initialize(&argc, argv); + benchmark::RunSpecifiedBenchmarks(); + return 0; +} + +// Sometimes a family of microbenchmarks can be implemented with +// just one routine that takes an extra argument to specify which +// one of the family of benchmarks to run. For example, the following +// code defines a family of microbenchmarks for measuring the speed +// of memcpy() calls of different lengths: + +static void BM_memcpy(benchmark::State& state) { + char* src = new char[state.range(0)]; char* dst = new char[state.range(0)]; + memset(src, 'x', state.range(0)); + while (state.KeepRunning()) + memcpy(dst, src, state.range(0)); + state.SetBytesProcessed(int64_t(state.iterations()) * + int64_t(state.range(0))); + delete[] src; delete[] dst; +} +BENCHMARK(BM_memcpy)->Arg(8)->Arg(64)->Arg(512)->Arg(1<<10)->Arg(8<<10); + +// The preceding code is quite repetitive, and can be replaced with the +// following short-hand. The following invocation will pick a few +// appropriate arguments in the specified range and will generate a +// microbenchmark for each such argument. +BENCHMARK(BM_memcpy)->Range(8, 8<<10); + +// You might have a microbenchmark that depends on two inputs. For +// example, the following code defines a family of microbenchmarks for +// measuring the speed of set insertion. +static void BM_SetInsert(benchmark::State& state) { + while (state.KeepRunning()) { + state.PauseTiming(); + set<int> data = ConstructRandomSet(state.range(0)); + state.ResumeTiming(); + for (int j = 0; j < state.range(1); ++j) + data.insert(RandomNumber()); + } +} +BENCHMARK(BM_SetInsert) + ->Args({1<<10, 1}) + ->Args({1<<10, 8}) + ->Args({1<<10, 64}) + ->Args({1<<10, 512}) + ->Args({8<<10, 1}) + ->Args({8<<10, 8}) + ->Args({8<<10, 64}) + ->Args({8<<10, 512}); + +// The preceding code is quite repetitive, and can be replaced with +// the following short-hand. The following macro will pick a few +// appropriate arguments in the product of the two specified ranges +// and will generate a microbenchmark for each such pair. +BENCHMARK(BM_SetInsert)->Ranges({{1<<10, 8<<10}, {1, 512}}); + +// For more complex patterns of inputs, passing a custom function +// to Apply allows programmatic specification of an +// arbitrary set of arguments to run the microbenchmark on. +// The following example enumerates a dense range on +// one parameter, and a sparse range on the second. +static void CustomArguments(benchmark::internal::Benchmark* b) { + for (int i = 0; i <= 10; ++i) + for (int j = 32; j <= 1024*1024; j *= 8) + b->Args({i, j}); +} +BENCHMARK(BM_SetInsert)->Apply(CustomArguments); + +// Templated microbenchmarks work the same way: +// Produce then consume 'size' messages 'iters' times +// Measures throughput in the absence of multiprogramming. +template <class Q> int BM_Sequential(benchmark::State& state) { + Q q; + typename Q::value_type v; + while (state.KeepRunning()) { + for (int i = state.range(0); i--; ) + q.push(v); + for (int e = state.range(0); e--; ) + q.Wait(&v); + } + // actually messages, not bytes: + state.SetBytesProcessed( + static_cast<int64_t>(state.iterations())*state.range(0)); +} +BENCHMARK_TEMPLATE(BM_Sequential, WaitQueue<int>)->Range(1<<0, 1<<10); + +Use `Benchmark::MinTime(double t)` to set the minimum time used to run the +benchmark. This option overrides the `benchmark_min_time` flag. + +void BM_test(benchmark::State& state) { + ... body ... +} +BENCHMARK(BM_test)->MinTime(2.0); // Run for at least 2 seconds. + +In a multithreaded test, it is guaranteed that none of the threads will start +until all have called KeepRunning, and all will have finished before KeepRunning +returns false. As such, any global setup or teardown you want to do can be +wrapped in a check against the thread index: + +static void BM_MultiThreaded(benchmark::State& state) { + if (state.thread_index == 0) { + // Setup code here. + } + while (state.KeepRunning()) { + // Run the test as normal. + } + if (state.thread_index == 0) { + // Teardown code here. + } +} +BENCHMARK(BM_MultiThreaded)->Threads(4); + + +If a benchmark runs a few milliseconds it may be hard to visually compare the +measured times, since the output data is given in nanoseconds per default. In +order to manually set the time unit, you can specify it manually: + +BENCHMARK(BM_test)->Unit(benchmark::kMillisecond); +*/ + +#ifndef BENCHMARK_BENCHMARK_API_H_ +#define BENCHMARK_BENCHMARK_API_H_ + +#include <assert.h> +#include <stddef.h> +#include <stdint.h> + +#include <string> +#include <vector> + +#include "macros.h" + +#if defined(BENCHMARK_HAS_CXX11) +#include <type_traits> +#include <utility> +#endif + +namespace benchmark { +class BenchmarkReporter; + +void Initialize(int* argc, char** argv); + +// Generate a list of benchmarks matching the specified --benchmark_filter flag +// and if --benchmark_list_tests is specified return after printing the name +// of each matching benchmark. Otherwise run each matching benchmark and +// report the results. +// +// The second and third overload use the specified 'console_reporter' and +// 'file_reporter' respectively. 'file_reporter' will write to the file +// specified +// by '--benchmark_output'. If '--benchmark_output' is not given the +// 'file_reporter' is ignored. +// +// RETURNS: The number of matching benchmarks. +size_t RunSpecifiedBenchmarks(); +size_t RunSpecifiedBenchmarks(BenchmarkReporter* console_reporter); +size_t RunSpecifiedBenchmarks(BenchmarkReporter* console_reporter, + BenchmarkReporter* file_reporter); + +// If this routine is called, peak memory allocation past this point in the +// benchmark is reported at the end of the benchmark report line. (It is +// computed by running the benchmark once with a single iteration and a memory +// tracer.) +// TODO(dominic) +// void MemoryUsage(); + +namespace internal { +class Benchmark; +class BenchmarkImp; +class BenchmarkFamilies; + +template <class T> +struct Voider { + typedef void type; +}; + +template <class T, class = void> +struct EnableIfString {}; + +template <class T> +struct EnableIfString<T, typename Voider<typename T::basic_string>::type> { + typedef int type; +}; + +void UseCharPointer(char const volatile*); + +// Take ownership of the pointer and register the benchmark. Return the +// registered benchmark. +Benchmark* RegisterBenchmarkInternal(Benchmark*); + +// Ensure that the standard streams are properly initialized in every TU. +int InitializeStreams(); +BENCHMARK_UNUSED static int stream_init_anchor = InitializeStreams(); + +} // end namespace internal + +// The DoNotOptimize(...) function can be used to prevent a value or +// expression from being optimized away by the compiler. This function is +// intended to add little to no overhead. +// See: https://youtu.be/nXaxk27zwlk?t=2441 +#if defined(__GNUC__) +template <class Tp> +inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) { + asm volatile("" : : "g"(value) : "memory"); +} +// Force the compiler to flush pending writes to global memory. Acts as an +// effective read/write barrier +inline BENCHMARK_ALWAYS_INLINE void ClobberMemory() { + asm volatile("" : : : "memory"); +} +#else +template <class Tp> +inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) { + internal::UseCharPointer(&reinterpret_cast<char const volatile&>(value)); +} +// FIXME Add ClobberMemory() for non-gnu compilers +#endif + +// TimeUnit is passed to a benchmark in order to specify the order of magnitude +// for the measured time. +enum TimeUnit { kNanosecond, kMicrosecond, kMillisecond }; + +// BigO is passed to a benchmark in order to specify the asymptotic +// computational +// complexity for the benchmark. In case oAuto is selected, complexity will be +// calculated automatically to the best fit. +enum BigO { oNone, o1, oN, oNSquared, oNCubed, oLogN, oNLogN, oAuto, oLambda }; + +// BigOFunc is passed to a benchmark in order to specify the asymptotic +// computational complexity for the benchmark. +typedef double(BigOFunc)(int); + +namespace internal { +class ThreadTimer; +class ThreadManager; + +#if defined(BENCHMARK_HAS_CXX11) +enum ReportMode : unsigned { +#else +enum ReportMode { +#endif + RM_Unspecified, // The mode has not been manually specified + RM_Default, // The mode is user-specified as default. + RM_ReportAggregatesOnly +}; +} + +// State is passed to a running Benchmark and contains state for the +// benchmark to use. +class State { + public: + // Returns true if the benchmark should continue through another iteration. + // NOTE: A benchmark may not return from the test until KeepRunning() has + // returned false. + bool KeepRunning() { + if (BENCHMARK_BUILTIN_EXPECT(!started_, false)) { + StartKeepRunning(); + } + bool const res = total_iterations_++ < max_iterations; + if (BENCHMARK_BUILTIN_EXPECT(!res, false)) { + FinishKeepRunning(); + } + return res; + } + + // REQUIRES: timer is running and 'SkipWithError(...)' has not been called + // by the current thread. + // Stop the benchmark timer. If not called, the timer will be + // automatically stopped after KeepRunning() returns false for the first time. + // + // For threaded benchmarks the PauseTiming() function only pauses the timing + // for the current thread. + // + // NOTE: The "real time" measurement is per-thread. If different threads + // report different measurements the largest one is reported. + // + // NOTE: PauseTiming()/ResumeTiming() are relatively + // heavyweight, and so their use should generally be avoided + // within each benchmark iteration, if possible. + void PauseTiming(); + + // REQUIRES: timer is not running and 'SkipWithError(...)' has not been called + // by the current thread. + // Start the benchmark timer. The timer is NOT running on entrance to the + // benchmark function. It begins running after the first call to KeepRunning() + // + // NOTE: PauseTiming()/ResumeTiming() are relatively + // heavyweight, and so their use should generally be avoided + // within each benchmark iteration, if possible. + void ResumeTiming(); + + // REQUIRES: 'SkipWithError(...)' has not been called previously by the + // current thread. + // Skip any future iterations of the 'KeepRunning()' loop in the current + // thread and report an error with the specified 'msg'. After this call + // the user may explicitly 'return' from the benchmark. + // + // For threaded benchmarks only the current thread stops executing and future + // calls to `KeepRunning()` will block until all threads have completed + // the `KeepRunning()` loop. If multiple threads report an error only the + // first error message is used. + // + // NOTE: Calling 'SkipWithError(...)' does not cause the benchmark to exit + // the current scope immediately. If the function is called from within + // the 'KeepRunning()' loop the current iteration will finish. It is the users + // responsibility to exit the scope as needed. + void SkipWithError(const char* msg); + + // REQUIRES: called exactly once per iteration of the KeepRunning loop. + // Set the manually measured time for this benchmark iteration, which + // is used instead of automatically measured time if UseManualTime() was + // specified. + // + // For threaded benchmarks the final value will be set to the largest + // reported values. + void SetIterationTime(double seconds); + + // Set the number of bytes processed by the current benchmark + // execution. This routine is typically called once at the end of a + // throughput oriented benchmark. If this routine is called with a + // value > 0, the report is printed in MB/sec instead of nanoseconds + // per iteration. + // + // REQUIRES: a benchmark has exited its KeepRunning loop. + BENCHMARK_ALWAYS_INLINE + void SetBytesProcessed(size_t bytes) { bytes_processed_ = bytes; } + + BENCHMARK_ALWAYS_INLINE + size_t bytes_processed() const { return bytes_processed_; } + + // If this routine is called with complexity_n > 0 and complexity report is + // requested for the + // family benchmark, then current benchmark will be part of the computation + // and complexity_n will + // represent the length of N. + BENCHMARK_ALWAYS_INLINE + void SetComplexityN(int complexity_n) { complexity_n_ = complexity_n; } + + BENCHMARK_ALWAYS_INLINE + int complexity_length_n() { return complexity_n_; } + + // If this routine is called with items > 0, then an items/s + // label is printed on the benchmark report line for the currently + // executing benchmark. It is typically called at the end of a processing + // benchmark where a processing items/second output is desired. + // + // REQUIRES: a benchmark has exited its KeepRunning loop. + BENCHMARK_ALWAYS_INLINE + void SetItemsProcessed(size_t items) { items_processed_ = items; } + + BENCHMARK_ALWAYS_INLINE + size_t items_processed() const { return items_processed_; } + + // If this routine is called, the specified label is printed at the + // end of the benchmark report line for the currently executing + // benchmark. Example: + // static void BM_Compress(benchmark::State& state) { + // ... + // double compress = input_size / output_size; + // state.SetLabel(StringPrintf("compress:%.1f%%", 100.0*compression)); + // } + // Produces output that looks like: + // BM_Compress 50 50 14115038 compress:27.3% + // + // REQUIRES: a benchmark has exited its KeepRunning loop. + void SetLabel(const char* label); + + // Allow the use of std::string without actually including <string>. + // This function does not participate in overload resolution unless StringType + // has the nested typename `basic_string`. This typename should be provided + // as an injected class name in the case of std::string. + template <class StringType> + void SetLabel(StringType const& str, + typename internal::EnableIfString<StringType>::type = 1) { + this->SetLabel(str.c_str()); + } + + // Range arguments for this run. CHECKs if the argument has been set. + BENCHMARK_ALWAYS_INLINE + int range(std::size_t pos = 0) const { + assert(range_.size() > pos); + return range_[pos]; + } + + BENCHMARK_DEPRECATED_MSG("use 'range(0)' instead") + int range_x() const { return range(0); } + + BENCHMARK_DEPRECATED_MSG("use 'range(1)' instead") + int range_y() const { return range(1); } + + BENCHMARK_ALWAYS_INLINE + size_t iterations() const { return total_iterations_; } + + private: + bool started_; + bool finished_; + size_t total_iterations_; + + std::vector<int> range_; + + size_t bytes_processed_; + size_t items_processed_; + + int complexity_n_; + + bool error_occurred_; + + public: + // Index of the executing thread. Values from [0, threads). + const int thread_index; + // Number of threads concurrently executing the benchmark. + const int threads; + const size_t max_iterations; + + // TODO make me private + State(size_t max_iters, const std::vector<int>& ranges, int thread_i, + int n_threads, internal::ThreadTimer* timer, + internal::ThreadManager* manager); + + private: + void StartKeepRunning(); + void FinishKeepRunning(); + internal::ThreadTimer* timer_; + internal::ThreadManager* manager_; + BENCHMARK_DISALLOW_COPY_AND_ASSIGN(State); +}; + +namespace internal { + +typedef void(Function)(State&); + +// ------------------------------------------------------ +// Benchmark registration object. The BENCHMARK() macro expands +// into an internal::Benchmark* object. Various methods can +// be called on this object to change the properties of the benchmark. +// Each method returns "this" so that multiple method calls can +// chained into one expression. +class Benchmark { + public: + virtual ~Benchmark(); + + // Note: the following methods all return "this" so that multiple + // method calls can be chained together in one expression. + + // Run this benchmark once with "x" as the extra argument passed + // to the function. + // REQUIRES: The function passed to the constructor must accept an arg1. + Benchmark* Arg(int x); + + // Run this benchmark with the given time unit for the generated output report + Benchmark* Unit(TimeUnit unit); + + // Run this benchmark once for a number of values picked from the + // range [start..limit]. (start and limit are always picked.) + // REQUIRES: The function passed to the constructor must accept an arg1. + Benchmark* Range(int start, int limit); + + // Run this benchmark once for all values in the range [start..limit] with + // specific step + // REQUIRES: The function passed to the constructor must accept an arg1. + Benchmark* DenseRange(int start, int limit, int step = 1); + + // Run this benchmark once with "args" as the extra arguments passed + // to the function. + // REQUIRES: The function passed to the constructor must accept arg1, arg2 ... + Benchmark* Args(const std::vector<int>& args); + + // Equivalent to Args({x, y}) + // NOTE: This is a legacy C++03 interface provided for compatibility only. + // New code should use 'Args'. + Benchmark* ArgPair(int x, int y) { + std::vector<int> args; + args.push_back(x); + args.push_back(y); + return Args(args); + } + + // Run this benchmark once for a number of values picked from the + // ranges [start..limit]. (starts and limits are always picked.) + // REQUIRES: The function passed to the constructor must accept arg1, arg2 ... + Benchmark* Ranges(const std::vector<std::pair<int, int> >& ranges); + + // Equivalent to ArgNames({name}) + Benchmark* ArgName(const std::string& name); + + // Set the argument names to display in the benchmark name. If not called, + // only argument values will be shown. + Benchmark* ArgNames(const std::vector<std::string>& names); + + // Equivalent to Ranges({{lo1, hi1}, {lo2, hi2}}). + // NOTE: This is a legacy C++03 interface provided for compatibility only. + // New code should use 'Ranges'. + Benchmark* RangePair(int lo1, int hi1, int lo2, int hi2) { + std::vector<std::pair<int, int> > ranges; + ranges.push_back(std::make_pair(lo1, hi1)); + ranges.push_back(std::make_pair(lo2, hi2)); + return Ranges(ranges); + } + + // Pass this benchmark object to *func, which can customize + // the benchmark by calling various methods like Arg, Args, + // Threads, etc. + Benchmark* Apply(void (*func)(Benchmark* benchmark)); + + // Set the range multiplier for non-dense range. If not called, the range + // multiplier kRangeMultiplier will be used. + Benchmark* RangeMultiplier(int multiplier); + + // Set the minimum amount of time to use when running this benchmark. This + // option overrides the `benchmark_min_time` flag. + // REQUIRES: `t > 0` + Benchmark* MinTime(double t); + + // Specify the amount of times to repeat this benchmark. This option overrides + // the `benchmark_repetitions` flag. + // REQUIRES: `n > 0` + Benchmark* Repetitions(int n); + + // Specify if each repetition of the benchmark should be reported separately + // or if only the final statistics should be reported. If the benchmark + // is not repeated then the single result is always reported. + Benchmark* ReportAggregatesOnly(bool v = true); + + // If a particular benchmark is I/O bound, runs multiple threads internally or + // if for some reason CPU timings are not representative, call this method. If + // called, the elapsed time will be used to control how many iterations are + // run, and in the printing of items/second or MB/seconds values. If not + // called, the cpu time used by the benchmark will be used. + Benchmark* UseRealTime(); + + // If a benchmark must measure time manually (e.g. if GPU execution time is + // being + // measured), call this method. If called, each benchmark iteration should + // call + // SetIterationTime(seconds) to report the measured time, which will be used + // to control how many iterations are run, and in the printing of items/second + // or MB/second values. + Benchmark* UseManualTime(); + + // Set the asymptotic computational complexity for the benchmark. If called + // the asymptotic computational complexity will be shown on the output. + Benchmark* Complexity(BigO complexity = benchmark::oAuto); + + // Set the asymptotic computational complexity for the benchmark. If called + // the asymptotic computational complexity will be shown on the output. + Benchmark* Complexity(BigOFunc* complexity); + + // Support for running multiple copies of the same benchmark concurrently + // in multiple threads. This may be useful when measuring the scaling + // of some piece of code. + + // Run one instance of this benchmark concurrently in t threads. + Benchmark* Threads(int t); + + // Pick a set of values T from [min_threads,max_threads]. + // min_threads and max_threads are always included in T. Run this + // benchmark once for each value in T. The benchmark run for a + // particular value t consists of t threads running the benchmark + // function concurrently. For example, consider: + // BENCHMARK(Foo)->ThreadRange(1,16); + // This will run the following benchmarks: + // Foo in 1 thread + // Foo in 2 threads + // Foo in 4 threads + // Foo in 8 threads + // Foo in 16 threads + Benchmark* ThreadRange(int min_threads, int max_threads); + + // For each value n in the range, run this benchmark once using n threads. + // min_threads and max_threads are always included in the range. + // stride specifies the increment. E.g. DenseThreadRange(1, 8, 3) starts + // a benchmark with 1, 4, 7 and 8 threads. + Benchmark* DenseThreadRange(int min_threads, int max_threads, int stride = 1); + + // Equivalent to ThreadRange(NumCPUs(), NumCPUs()) + Benchmark* ThreadPerCpu(); + + virtual void Run(State& state) = 0; + + // Used inside the benchmark implementation + struct Instance; + + protected: + explicit Benchmark(const char* name); + Benchmark(Benchmark const&); + void SetName(const char* name); + + int ArgsCnt() const; + + static void AddRange(std::vector<int>* dst, int lo, int hi, int mult); + + private: + friend class BenchmarkFamilies; + + std::string name_; + ReportMode report_mode_; + std::vector<std::string> arg_names_; // Args for all benchmark runs + std::vector<std::vector<int> > args_; // Args for all benchmark runs + TimeUnit time_unit_; + int range_multiplier_; + double min_time_; + int repetitions_; + bool use_real_time_; + bool use_manual_time_; + BigO complexity_; + BigOFunc* complexity_lambda_; + std::vector<int> thread_counts_; + + Benchmark& operator=(Benchmark const&); +}; + +} // namespace internal + +// Create and register a benchmark with the specified 'name' that invokes +// the specified functor 'fn'. +// +// RETURNS: A pointer to the registered benchmark. +internal::Benchmark* RegisterBenchmark(const char* name, + internal::Function* fn); + +#if defined(BENCHMARK_HAS_CXX11) +template <class Lambda> +internal::Benchmark* RegisterBenchmark(const char* name, Lambda&& fn); +#endif + +namespace internal { +// The class used to hold all Benchmarks created from static function. +// (ie those created using the BENCHMARK(...) macros. +class FunctionBenchmark : public Benchmark { + public: + FunctionBenchmark(const char* name, Function* func) + : Benchmark(name), func_(func) {} + + virtual void Run(State& st); + + private: + Function* func_; +}; + +#ifdef BENCHMARK_HAS_CXX11 +template <class Lambda> +class LambdaBenchmark : public Benchmark { + public: + virtual void Run(State& st) { lambda_(st); } + + private: + template <class OLambda> + LambdaBenchmark(const char* name, OLambda&& lam) + : Benchmark(name), lambda_(std::forward<OLambda>(lam)) {} + + LambdaBenchmark(LambdaBenchmark const&) = delete; + + private: + template <class Lam> + friend Benchmark* ::benchmark::RegisterBenchmark(const char*, Lam&&); + + Lambda lambda_; +}; +#endif + +} // end namespace internal + +inline internal::Benchmark* RegisterBenchmark(const char* name, + internal::Function* fn) { + return internal::RegisterBenchmarkInternal( + ::new internal::FunctionBenchmark(name, fn)); +} + +#ifdef BENCHMARK_HAS_CXX11 +template <class Lambda> +internal::Benchmark* RegisterBenchmark(const char* name, Lambda&& fn) { + using BenchType = + internal::LambdaBenchmark<typename std::decay<Lambda>::type>; + return internal::RegisterBenchmarkInternal( + ::new BenchType(name, std::forward<Lambda>(fn))); +} +#endif + +#if defined(BENCHMARK_HAS_CXX11) && \ + (!defined(BENCHMARK_GCC_VERSION) || BENCHMARK_GCC_VERSION >= 409) +template <class Lambda, class... Args> +internal::Benchmark* RegisterBenchmark(const char* name, Lambda&& fn, + Args&&... args) { + return benchmark::RegisterBenchmark( + name, [=](benchmark::State& st) { fn(st, args...); }); +} +#else +#define BENCHMARK_HAS_NO_VARIADIC_REGISTER_BENCHMARK +#endif + +// The base class for all fixture tests. +class Fixture : public internal::Benchmark { + public: + Fixture() : internal::Benchmark("") {} + + virtual void Run(State& st) { + this->SetUp(st); + this->BenchmarkCase(st); + this->TearDown(st); + } + + // These will be deprecated ... + virtual void SetUp(const State&) {} + virtual void TearDown(const State&) {} + // ... In favor of these. + virtual void SetUp(State& st) { SetUp(const_cast<const State&>(st)); } + virtual void TearDown(State& st) { TearDown(const_cast<const State&>(st)); } + + protected: + virtual void BenchmarkCase(State&) = 0; +}; + +} // end namespace benchmark + +// ------------------------------------------------------ +// Macro to register benchmarks + +// Check that __COUNTER__ is defined and that __COUNTER__ increases by 1 +// every time it is expanded. X + 1 == X + 0 is used in case X is defined to be +// empty. If X is empty the expression becomes (+1 == +0). +#if defined(__COUNTER__) && (__COUNTER__ + 1 == __COUNTER__ + 0) +#define BENCHMARK_PRIVATE_UNIQUE_ID __COUNTER__ +#else +#define BENCHMARK_PRIVATE_UNIQUE_ID __LINE__ +#endif + +// Helpers for generating unique variable names +#define BENCHMARK_PRIVATE_NAME(n) \ + BENCHMARK_PRIVATE_CONCAT(_benchmark_, BENCHMARK_PRIVATE_UNIQUE_ID, n) +#define BENCHMARK_PRIVATE_CONCAT(a, b, c) BENCHMARK_PRIVATE_CONCAT2(a, b, c) +#define BENCHMARK_PRIVATE_CONCAT2(a, b, c) a##b##c + +#define BENCHMARK_PRIVATE_DECLARE(n) \ + static ::benchmark::internal::Benchmark* BENCHMARK_PRIVATE_NAME(n) \ + BENCHMARK_UNUSED + +#define BENCHMARK(n) \ + BENCHMARK_PRIVATE_DECLARE(n) = \ + (::benchmark::internal::RegisterBenchmarkInternal( \ + new ::benchmark::internal::FunctionBenchmark(#n, n))) + +// Old-style macros +#define BENCHMARK_WITH_ARG(n, a) BENCHMARK(n)->Arg((a)) +#define BENCHMARK_WITH_ARG2(n, a1, a2) BENCHMARK(n)->Args({(a1), (a2)}) +#define BENCHMARK_WITH_UNIT(n, t) BENCHMARK(n)->Unit((t)) +#define BENCHMARK_RANGE(n, lo, hi) BENCHMARK(n)->Range((lo), (hi)) +#define BENCHMARK_RANGE2(n, l1, h1, l2, h2) \ + BENCHMARK(n)->RangePair({{(l1), (h1)}, {(l2), (h2)}}) + +#if __cplusplus >= 201103L + +// Register a benchmark which invokes the function specified by `func` +// with the additional arguments specified by `...`. +// +// For example: +// +// template <class ...ExtraArgs>` +// void BM_takes_args(benchmark::State& state, ExtraArgs&&... extra_args) { +// [...] +//} +// /* Registers a benchmark named "BM_takes_args/int_string_test` */ +// BENCHMARK_CAPTURE(BM_takes_args, int_string_test, 42, std::string("abc")); +#define BENCHMARK_CAPTURE(func, test_case_name, ...) \ + BENCHMARK_PRIVATE_DECLARE(func) = \ + (::benchmark::internal::RegisterBenchmarkInternal( \ + new ::benchmark::internal::FunctionBenchmark( \ + #func "/" #test_case_name, \ + [](::benchmark::State& st) { func(st, __VA_ARGS__); }))) + +#endif // __cplusplus >= 11 + +// This will register a benchmark for a templatized function. For example: +// +// template<int arg> +// void BM_Foo(int iters); +// +// BENCHMARK_TEMPLATE(BM_Foo, 1); +// +// will register BM_Foo<1> as a benchmark. +#define BENCHMARK_TEMPLATE1(n, a) \ + BENCHMARK_PRIVATE_DECLARE(n) = \ + (::benchmark::internal::RegisterBenchmarkInternal( \ + new ::benchmark::internal::FunctionBenchmark(#n "<" #a ">", n<a>))) + +#define BENCHMARK_TEMPLATE2(n, a, b) \ + BENCHMARK_PRIVATE_DECLARE(n) = \ + (::benchmark::internal::RegisterBenchmarkInternal( \ + new ::benchmark::internal::FunctionBenchmark(#n "<" #a "," #b ">", \ + n<a, b>))) + +#if __cplusplus >= 201103L +#define BENCHMARK_TEMPLATE(n, ...) \ + BENCHMARK_PRIVATE_DECLARE(n) = \ + (::benchmark::internal::RegisterBenchmarkInternal( \ + new ::benchmark::internal::FunctionBenchmark( \ + #n "<" #__VA_ARGS__ ">", n<__VA_ARGS__>))) +#else +#define BENCHMARK_TEMPLATE(n, a) BENCHMARK_TEMPLATE1(n, a) +#endif + +#define BENCHMARK_PRIVATE_DECLARE_F(BaseClass, Method) \ + class BaseClass##_##Method##_Benchmark : public BaseClass { \ + public: \ + BaseClass##_##Method##_Benchmark() : BaseClass() { \ + this->SetName(#BaseClass "/" #Method); \ + } \ + \ + protected: \ + virtual void BenchmarkCase(::benchmark::State&); \ + }; + +#define BENCHMARK_DEFINE_F(BaseClass, Method) \ + BENCHMARK_PRIVATE_DECLARE_F(BaseClass, Method) \ + void BaseClass##_##Method##_Benchmark::BenchmarkCase + +#define BENCHMARK_REGISTER_F(BaseClass, Method) \ + BENCHMARK_PRIVATE_REGISTER_F(BaseClass##_##Method##_Benchmark) + +#define BENCHMARK_PRIVATE_REGISTER_F(TestName) \ + BENCHMARK_PRIVATE_DECLARE(TestName) = \ + (::benchmark::internal::RegisterBenchmarkInternal(new TestName())) + +// This macro will define and register a benchmark within a fixture class. +#define BENCHMARK_F(BaseClass, Method) \ + BENCHMARK_PRIVATE_DECLARE_F(BaseClass, Method) \ + BENCHMARK_REGISTER_F(BaseClass, Method); \ + void BaseClass##_##Method##_Benchmark::BenchmarkCase + +// Helper macro to create a main routine in a test that runs the benchmarks +#define BENCHMARK_MAIN() \ + int main(int argc, char** argv) { \ + ::benchmark::Initialize(&argc, argv); \ + ::benchmark::RunSpecifiedBenchmarks(); \ + } + +#endif // BENCHMARK_BENCHMARK_API_H_ |