Remove unused code, improve speed of Parser::CurrentToken (improvement seen in measurements and pro…

runtime/vm/parser.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/parser.h"
 
 #include "lib/invocation_mirror.h"
 #include "platform/utils.h"
 #include "vm/bootstrap.h"
 #include "vm/class_finalizer.h"
@@ skipping 375 matching lines @@
                                   const Script& script) {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate->long_jump_base()->IsSafeToJump());
   TimerScope timer(FLAG_compiler_stats, &CompilerStats::parser_timer);
   VMTagScope tagScope(isolate, VMTag::kCompileTopLevelTagId);
   Parser parser(script, library, 0);
   parser.ParseTopLevel();
 }
 
 
-Token::Kind Parser::CurrentToken() {
-  if (token_kind_ == Token::kILLEGAL) {
-    token_kind_ = tokens_iterator_.CurrentTokenKind();
-    if (token_kind_ == Token::kERROR) {
-      ErrorMsg(TokenPos(), "%s", CurrentLiteral()->ToCString());
-    }
+void Parser::ComputeCurrentToken() {
+  ASSERT(token_kind_ == Token::kILLEGAL);
+  token_kind_ = tokens_iterator_.CurrentTokenKind();
+  if (token_kind_ == Token::kERROR) {
+    ErrorMsg(TokenPos(), "%s", CurrentLiteral()->ToCString());
   }
-  CompilerStats::num_token_checks++;
-  return token_kind_;
 }
 
 
 Token::Kind Parser::LookaheadToken(int num_tokens) {
   CompilerStats::num_tokens_lookahead++;
   CompilerStats::num_token_checks++;
   return tokens_iterator_.LookaheadTokenKind(num_tokens);
 }
 
 
@@ skipping 10611 matching lines @@
 void Parser::SkipQualIdent() {
   ASSERT(IsIdentifier());
   ConsumeToken();
   if (CurrentToken() == Token::kPERIOD) {
     ConsumeToken();  // Consume the kPERIOD token.
     ExpectIdentifier("identifier expected after '.'");
   }
 }
 
 }  // namespace dart