Function MemoryUsage

extern/re2/re2/testing/regexp_benchmark.cc:55–120

}

void MemoryUsage() {
  const char* regexp = "(\\d+)-(\\d+)-(\\d+)";
  const char* text = "650-253-0001";
  {
    MallocCounter mc(MallocCounter::THIS_THREAD_ONLY);
    Regexp* re = Regexp::Parse(regexp, Regexp::LikePerl, NULL);
    CHECK(re);
    // Can't pass mc.HeapGrowth() and mc.PeakHeapGrowth() to LOG(INFO) directly,
    // because LOG(INFO) might do a big allocation before they get evaluated.
    fprintf(stderr, "Regexp: %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    mc.Reset();

    Prog* prog = re->CompileToProg(0);
    CHECK(prog);
    CHECK(prog->IsOnePass());
    CHECK(prog->CanBitState());
    fprintf(stderr, "Prog:   %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    mc.Reset();

    StringPiece sp[4];
    CHECK(prog->SearchOnePass(text, text, Prog::kAnchored, Prog::kFullMatch, sp, 4));
    fprintf(stderr, "Search: %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    delete prog;
    re->Decref();
  }

  {
    MallocCounter mc(MallocCounter::THIS_THREAD_ONLY);

    PCRE re(regexp, PCRE::UTF8);
    fprintf(stderr, "RE:     %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    PCRE::FullMatch(text, re);
    fprintf(stderr, "RE:     %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
  }

  {
    MallocCounter mc(MallocCounter::THIS_THREAD_ONLY);

    PCRE* re = new PCRE(regexp, PCRE::UTF8);
    fprintf(stderr, "PCRE*:  %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    PCRE::FullMatch(text, *re);
    fprintf(stderr, "PCRE*:  %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());
    delete re;
  }

  {
    MallocCounter mc(MallocCounter::THIS_THREAD_ONLY);

    RE2 re(regexp);
    fprintf(stderr, "RE2:    %7lld bytes (peak=%lld)\n",
            mc.HeapGrowth(), mc.PeakHeapGrowth());