Add rule for generating lexer and implement lexer shell.

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
+//       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 <fcntl.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "v8.h"
+
+#include "api.h"
+#include "ast.h"
+#include "char-predicates-inl.h"
+#include "messages.h"
+#include "platform.h"
+#include "runtime.h"
+#include "scanner-character-streams.h"
+#include "scopeinfo.h"
+#include "string-stream.h"
+#include "scanner.h"
+
+using namespace v8::internal;
+
+Handle<String> ReadFile(const char* name, Isolate* isolate) {
+  FILE* file = fopen(name, "rb");
+  if (file == NULL) return Handle<String>();
+
+  fseek(file, 0, SEEK_END);
+  int size = ftell(file);
+  rewind(file);
+
+  uint8_t* chars = new uint8_t[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);
+  Handle<String> result = isolate->factory()->NewStringFromOneByte(
+      Vector<const uint8_t>(chars, size));
+  delete[] chars;
+  return result;
+}
+
+
+class BaselineScanner {
+ public:
+  BaselineScanner(const char* fname, Isolate* isolate) {
+    Handle<String> source = ReadFile(fname, isolate);
+    unicode_cache_ = new UnicodeCache();
+    scanner_ = new Scanner(unicode_cache_);
+    stream_ = new GenericStringUtf16CharacterStream(
+                      source, 0, source->length());
+    scanner_->Initialize(stream_);
+  }
+
+  ~BaselineScanner() {
+    delete scanner_;
+    delete stream_;
+    delete unicode_cache_;
+  }
+
+  Token::Value Next() {
+    return scanner_->Next();
+  }
+
+  Scanner::Location Location() {
+    return scanner_->location();
+  }
+
+ private:
+  UnicodeCache* unicode_cache_;
+  Scanner* scanner_;
+  GenericStringUtf16CharacterStream* stream_;
+};
+
+
+class ExperimentalScanner {
+  explicit ExperimentalScanner(const char* fname);
+  ~ExperimentalScanner();
+  Token::Value Next();
+  Scanner::Location Location();
+};
+
+
+int main(int argc, char* argv[]) {
+  v8::V8::InitializeICU();
+  v8::V8::SetFlagsFromCommandLine(&argc, argv, true);
+  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();
+      HandleScope handle_scope(isolate);
+      BaselineScanner baseline(argv[1], isolate);
+      Token::Value current;
+      while ((current = baseline.Next()) != Token::EOS) {
+        printf("%11s => (%d, %d)\n",
+               Token::Name(current),
+               baseline.Location().beg_pos,
+               baseline.Location().end_pos);
+      }
+    }
+  }
+  v8::V8::Dispose();
+  return 0;
+}