Add a flag to lexer-shell to replicate input file.

src/lexer/lexer-shell.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 38 matching lines @@
 
 using namespace v8::internal;
 
 enum Encoding {
   LATIN1,
   UTF8,
   UTF16
 };
 
 
-const byte* ReadFile(const char* name, Isolate* isolate, int* size) {
-  FILE* file = fopen(name, "rb");
-  *size = 0;
-  if (file == NULL) return NULL;
-
-  fseek(file, 0, SEEK_END);
-  *size = ftell(file);
-  rewind(file);
-
-  byte* chars = new byte[*size + 1];
-  chars[*size] = 0;
-  for (int i = 0; i < *size;) {
-    int read = static_cast<int>(fread(&chars[i], 1, *size - i, file));
-    i += read;
-  }
-  fclose(file);
-  return chars;
-}
-
 class BaselineScanner {
  public:
   BaselineScanner(const char* fname,
                   Isolate* isolate,
                   Encoding encoding,
-                  ElapsedTimer* timer)
+                  ElapsedTimer* timer,
+                  int repeat)
       : stream_(NULL) {
     int length = 0;
-    source_ = ReadFile(fname, isolate, &length);
+    source_ = ReadFile(fname, isolate, &length, repeat);
     unicode_cache_ = new UnicodeCache();
     scanner_ = new Scanner(unicode_cache_);
     switch (encoding) {
       case UTF8:
         stream_ = new Utf8ToUtf16CharacterStream(source_, length);
         break;
       case UTF16: {
         Handle<String> result = isolate->factory()->NewStringFromTwoByte(
             Vector<const uint16_t>(
                 reinterpret_cast<const uint16_t*>(source_),
@@ skipping 54 matching lines @@
            prefix, Token::Name(value),
            static_cast<int>(beg), static_cast<int>(end));
   }
 };
 
 
 TimeDelta RunBaselineScanner(const char* fname,
                              Isolate* isolate,
                              Encoding encoding,
                              bool dump_tokens,
-                             std::vector<TokenWithLocation>* tokens) {
+                             std::vector<TokenWithLocation>* tokens,
+                             int repeat) {
   ElapsedTimer timer;
-  BaselineScanner scanner(fname, isolate, encoding, &timer);
+  BaselineScanner scanner(fname, isolate, encoding, &timer, repeat);
   Token::Value token;
   int beg, end;
   do {
     token = scanner.Next(&beg, &end);
     if (dump_tokens) {
       tokens->push_back(TokenWithLocation(token, beg, end));
     }
   } while (token != Token::EOS);
   return timer.Elapsed();
 }
 
 
 TimeDelta RunExperimentalScanner(const char* fname,
                                  Isolate* isolate,
                                  Encoding encoding,
                                  bool dump_tokens,
-                                 std::vector<TokenWithLocation>* tokens) {
+                                 std::vector<TokenWithLocation>* tokens,
+                                 int repeat) {
   ElapsedTimer timer;
+  ExperimentalScanner scanner(fname, true, isolate, repeat);
   timer.Start();
-  ExperimentalScanner scanner(fname, true, isolate);
   Token::Value token;
   do {
     token = scanner.Next();
     ExperimentalScanner::Location location = scanner.location();
     if (dump_tokens) {
       tokens->push_back(
           TokenWithLocation(token, location.beg_pos, location.end_pos));
     }
   } while (token != Token::EOS);
   return timer.Elapsed();
@@ skipping 11 matching lines @@
 }
 
 
 std::pair<TimeDelta, TimeDelta> ProcessFile(
     const char* fname,
     Encoding encoding,
     Isolate* isolate,
     bool run_baseline,
     bool run_experimental,
     bool print_tokens,
-    bool check_tokens) {
+    bool check_tokens,
+    int repeat) {
   if (print_tokens) {
     printf("Processing file %s\n", fname);
   }
   HandleScope handle_scope(isolate);
   std::vector<TokenWithLocation> baseline_tokens, experimental_tokens;
   TimeDelta baseline_time, experimental_time;
   if (run_baseline) {
     baseline_time = RunBaselineScanner(
         fname, isolate, encoding, print_tokens || check_tokens,
-        &baseline_tokens);
+        &baseline_tokens, repeat);
   }
   if (run_experimental) {
     experimental_time = RunExperimentalScanner(
         fname, isolate, encoding, print_tokens || check_tokens,
-        &experimental_tokens);
+        &experimental_tokens, repeat);
   }
   if (print_tokens && !run_experimental) {
     PrintTokens("Baseline", baseline_tokens);
   }
   if (print_tokens && !run_baseline) {
     PrintTokens("Experimental", experimental_tokens);
   }
   if ((print_tokens || check_tokens) && run_baseline && run_experimental) {
     if (print_tokens) {
       printf("No of tokens in Baseline:     %d\n",
@@ skipping 19 matching lines @@
 int main(int argc, char* argv[]) {
   v8::V8::InitializeICU();
   v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
   Encoding encoding = LATIN1;
   bool print_tokens = false;
   bool run_baseline = true;
   bool run_experimental = true;
   bool check_tokens = true;
   std::vector<std::string> fnames;
   std::string benchmark;
+  int repeat = 1;
   for (int i = 0; i < argc; ++i) {
     if (strcmp(argv[i], "--latin1") == 0) {
       encoding = LATIN1;
     } else if (strcmp(argv[i], "--utf8") == 0) {
       encoding = UTF8;
     } else if (strcmp(argv[i], "--utf16") == 0) {
       encoding = UTF16;
     } else if (strcmp(argv[i], "--print-tokens") == 0) {
       print_tokens = true;
     } else if (strcmp(argv[i], "--no-baseline") == 0) {
       run_baseline = false;
     } else if (strcmp(argv[i], "--no-experimental") == 0) {
       run_experimental = false;
     } else if (strcmp(argv[i], "--no-check") == 0) {
       check_tokens = false;
     } else if (strncmp(argv[i], "--benchmark=", 12) == 0) {
       benchmark = std::string(argv[i]).substr(12);
+    } else if (strncmp(argv[i], "--repeat=", 9) == 0) {
+      std::string repeat_str = std::string(argv[i]).substr(9);
+      repeat = atoi(repeat_str.c_str());
     } else if (i > 0 && argv[i][0] != '-') {
       fnames.push_back(std::string(argv[i]));
     }
   }
   v8::Isolate* isolate = v8::Isolate::GetCurrent();
   {
     v8::HandleScope handle_scope(isolate);
     v8::Handle<v8::ObjectTemplate> global = v8::ObjectTemplate::New();
     v8::Local<v8::Context> context = v8::Context::New(isolate, NULL, global);
     ASSERT(!context.IsEmpty());
     {
       v8::Context::Scope scope(context);
       Isolate* isolate = Isolate::Current();
       double baseline_total = 0, experimental_total = 0;
       for (size_t i = 0; i < fnames.size(); i++) {
         std::pair<TimeDelta, TimeDelta> times;
         check_tokens = check_tokens && run_baseline && run_experimental;
         times = ProcessFile(fnames[i].c_str(), encoding, isolate, run_baseline,
-                            run_experimental, print_tokens, check_tokens);
+                            run_experimental, print_tokens, check_tokens,
+                            repeat);
         baseline_total += times.first.InMillisecondsF();
         experimental_total += times.second.InMillisecondsF();
       }
       if (run_baseline) {
         printf("Baseline%s(RunTime): %.f ms\n", benchmark.c_str(),
                baseline_total);
       }
       if (run_experimental) {
         if (benchmark.empty()) benchmark = "Experimental";
         printf("%s(RunTime): %.f ms\n", benchmark.c_str(),
                experimental_total);
       }
     }
   }
   v8::V8::Dispose();
   return 0;
 }