Replace RE2 import with a dependency

third_party/re2/util/benchmark.cc

-// Copyright 2009 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include "util/util.h"
-#include "util/flags.h"
-#include "util/benchmark.h"
-#include "re2/re2.h"
-
-DEFINE_string(test_tmpdir, "/var/tmp", "temp directory");
-
-using testing::Benchmark;
-using namespace re2;
-
-static Benchmark* benchmarks[10000];
-static int nbenchmarks;
-
-void Benchmark::Register() {
-        benchmarks[nbenchmarks] = this;
-        if(lo < 1)
-                lo = 1;
-        if(hi < lo)
-                hi = lo;
-        nbenchmarks++;
-}
-
-static int64 nsec() {
-#if defined(__APPLE__)
-        struct timeval tv;
-        if(gettimeofday(&tv, 0) < 0)
-                return -1;
-        return (int64)tv.tv_sec*1000*1000*1000 + tv.tv_usec*1000;
-#elif defined(_WIN32)
-        // https://msdn.microsoft.com/en-us/library/windows/desktop/dn553408.aspx
-        // describes how to query ticks and convert to microseconds. Of course,
-        // what we want in this case are nanoseconds. Also, note that .QuadPart
-        // is a signed 64-bit integer, so casting to int64 shouldn't be needed.
-        LARGE_INTEGER freq;
-        QueryPerformanceFrequency(&freq);
-        LARGE_INTEGER ticks;
-        QueryPerformanceCounter(&ticks);
-        ticks.QuadPart *= 1000*1000*1000;
-        ticks.QuadPart /= freq.QuadPart;
-        return ticks.QuadPart;
-#else
-        struct timespec tp;
-        if(clock_gettime(CLOCK_REALTIME, &tp) < 0)
-                return -1;
-        return (int64)tp.tv_sec*1000*1000*1000 + tp.tv_nsec;
-#endif
-}
-
-static int64 bytes;
-static int64 ns;
-static int64 t0;
-static int64 items;
-
-void SetBenchmarkBytesProcessed(long long x) {
-        bytes = x;
-}
-
-void StopBenchmarkTiming() {
-        if(t0 != 0)
-                ns += nsec() - t0;
-        t0 = 0;
-}
-
-void StartBenchmarkTiming() {
-        if(t0 == 0)
-                t0 = nsec();
-}
-
-void SetBenchmarkItemsProcessed(int n) {
-        items = n;
-}
-
-void BenchmarkMemoryUsage() {
-        // TODO(rsc): Implement.
-}
-
-int NumCPUs() {
-        return 1;
-}
-
-static void runN(Benchmark *b, int n, int siz) {
-        bytes = 0;
-        items = 0;
-        ns = 0;
-        t0 = nsec();
-        if(b->fn)
-                b->fn(n);
-        else if(b->fnr)
-                b->fnr(n, siz);
-        else {
-                fprintf(stderr, "%s: missing function\n", b->name);
-                exit(2);
-        }
-        if(t0 != 0)
-                ns += nsec() - t0;
-}
-
-static int round(int n) {
-        int base = 1;
-        
-        while(base*10 < n)
-                base *= 10;
-        if(n < 2*base)
-                return 2*base;
-        if(n < 5*base)
-                return 5*base;
-        return 10*base;
-}
-
-void RunBench(Benchmark* b, int nthread, int siz) {
-        int n, last;
-
-        // TODO(rsc): Threaded benchmarks.
-        if(nthread != 1)
-                return;
-        
-        // run once in case it's expensive
-        n = 1;
-        runN(b, n, siz);
-        while(ns < (int)1e9 && n < (int)1e9) {
-                last = n;
-                if(ns/n == 0)
-                        n = (int)1e9;
-                else
-                        n = (int)1e9 / static_cast<int>(ns/n);
-                
-                n = max(last+1, min(n+n/2, 100*last));
-                n = round(n);
-                runN(b, n, siz);
-        }
-        
-        char mb[100];
-        char suf[100];
-        mb[0] = '\0';
-        suf[0] = '\0';
-        if(ns > 0 && bytes > 0)
-                snprintf(mb, sizeof mb, "\t%7.2f MB/s", ((double)bytes/1e6)/((double)ns/1e9));
-        if(b->fnr || b->lo != b->hi) {
-                if(siz >= (1<<20))
-                        snprintf(suf, sizeof suf, "/%dM", siz/(1<<20));
-                else if(siz >= (1<<10))
-                        snprintf(suf, sizeof suf, "/%dK", siz/(1<<10));
-                else
-                        snprintf(suf, sizeof suf, "/%d", siz);
-        }
-        printf("%s%s\t%8lld\t%10lld ns/op%s\n", b->name, suf, (long long)n, (long long)ns/n, mb);
-        fflush(stdout);
-}
-
-static int match(const char* name, int argc, const char** argv) {
-        if(argc == 1)
-                return 1;
-        for(int i = 1; i < argc; i++)
-                if(RE2::PartialMatch(name, argv[i]))
-                        return 1;
-        return 0;
-}
-
-int main(int argc, const char** argv) {
-        for(int i = 0; i < nbenchmarks; i++) {
-                Benchmark* b = benchmarks[i];
-                if(match(b->name, argc, argv))
-                        for(int j = b->threadlo; j <= b->threadhi; j++)
-                                for(int k = max(b->lo, 1); k <= max(b->hi, 1); k<<=1)
-                                        RunBench(b, j, k);
-        }
-}
-