Add parser-shell.

tools/parser-shell.cc

Index: tools/parser-shell.cc
diff --git a/tools/parser-shell.cc b/tools/parser-shell.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4da15fc7e3e3b790db79f084a924e943c9e30060
--- /dev/null
+++ b/tools/parser-shell.cc
@@ -0,0 +1,171 @@
+// Copyright 2014 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
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <assert.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string>
+#include <vector>
+#include "v8.h"
+
+#include "api.h"
+#include "compiler.h"
+#include "scanner-character-streams.h"
+#include "shell-utils.h"
+#include "parser.h"
+#include "preparse-data-format.h"
+#include "preparse-data.h"
+#include "preparser.h"
+
+using namespace v8::internal;
+
+enum TestMode {
+  PreParseAndParse,
+  PreParse,
+  Parse
+};
+
+std::pair<TimeDelta, TimeDelta> RunBaselineParser(
+    const char* fname, Encoding encoding, int repeat, v8::Isolate* isolate,
+    v8::Handle<v8::Context> context, TestMode test_mode) {
+  int length = 0;
+  const byte* source = ReadFileAndRepeat(fname, &length, repeat);
+  v8::Handle<v8::String> source_handle;
+  switch (encoding) {
+    case UTF8: {
+      source_handle = v8::String::NewFromUtf8(
+          isolate, reinterpret_cast<const char*>(source));
+      break;
+    }
+    case UTF16: {
+      source_handle = v8::String::NewFromTwoByte(
+          isolate, reinterpret_cast<const uint16_t*>(source),
+          v8::String::kNormalString, length / 2);
+      break;
+    }
+    case LATIN1: {
+      source_handle = v8::String::NewFromOneByte(isolate, source);
+      break;
+    }
+  }
+  v8::ScriptData* cached_data = NULL;
+  TimeDelta preparse_time, parse_time;
+  if (test_mode == PreParseAndParse || test_mode == PreParse) {
+    ElapsedTimer timer;
+    timer.Start();
+    cached_data = v8::ScriptData::PreCompile(source_handle);
+    preparse_time = timer.Elapsed();
+    if (cached_data == NULL || cached_data->HasError()) {
+      fprintf(stderr, "Preparsing failed\n");
+      return std::make_pair(TimeDelta(), TimeDelta());
+    }
+  }
+  if (test_mode == PreParseAndParse || test_mode == Parse) {
+    Handle<String> str = v8::Utils::OpenHandle(*source_handle);
+    i::Isolate* internal_isolate = str->GetIsolate();
+    Handle<Script> script = internal_isolate->factory()->NewScript(str);
+    CompilationInfoWithZone info(script);
+    info.MarkAsGlobal();
+    i::ScriptDataImpl* cached_data_impl =
+        static_cast<i::ScriptDataImpl*>(cached_data);
+    if (test_mode == PreParseAndParse) {
+      info.SetCachedData(&cached_data_impl,
+                         i::CONSUME_CACHED_DATA);
+    }
+    info.SetContext(v8::Utils::OpenHandle(*context));
+    ElapsedTimer timer;
+    timer.Start();
+    // Allow lazy parsing; otherwise the preparse data won't help.
+    bool success = Parser::Parse(&info, true);
+    parse_time = timer.Elapsed();
+    if (!success) {
+      fprintf(stderr, "Parsing failed\n");
+      return std::make_pair(TimeDelta(), TimeDelta());
+    }
+  }
+  return std::make_pair(preparse_time, parse_time);
+}
+
+
+int main(int argc, char* argv[]) {
+  v8::V8::InitializeICU();
+  v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+  Encoding encoding = LATIN1;
+  TestMode test_mode = PreParseAndParse;
+  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], "--preparse-and-parse") == 0) {
+      test_mode = PreParseAndParse;
+    } else if (strcmp(argv[i], "--preparse") == 0) {
+      test_mode = PreParse;
+    } else if (strcmp(argv[i], "--parse") == 0) {
+      test_mode = Parse;
+    } 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(isolate);
+    v8::Local<v8::Context> context = v8::Context::New(isolate, NULL, global);
+    ASSERT(!context.IsEmpty());
+    {
+      v8::Context::Scope scope(context);
+      double preparse_total = 0;
+      double parse_total = 0;
+      for (size_t i = 0; i < fnames.size(); i++) {
+        std::pair<TimeDelta, TimeDelta> time = RunBaselineParser(
+            fnames[i].c_str(), encoding, repeat, isolate, context, test_mode);
+        preparse_total += time.first.InMillisecondsF();
+        parse_total += time.second.InMillisecondsF();
+      }
+      if (benchmark.empty()) benchmark = "Baseline";
+      printf("%s(PreParseRunTime): %.f ms\n", benchmark.c_str(),
+             preparse_total);
+      printf("%s(ParseRunTime): %.f ms\n", benchmark.c_str(), parse_total);
+      printf("%s(RunTime): %.f ms\n", benchmark.c_str(),
+             preparse_total + parse_total);
+    }
+  }
+  v8::V8::Dispose();
+  return 0;
+}