Optimize parsing of qualified identifiers.

runtime/vm/parser.h

 // 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.
 
 #ifndef VM_PARSER_H_
 #define VM_PARSER_H_
 
 #include "include/dart_api.h"
 
 #include "vm/ast.h"
@@ skipping 311 matching lines @@
   RawAbstractType* ParseFinalVarOrType(TypeResolution type_resolution);
   AstNode* ParseVariableDeclaration(const AbstractType& type, bool is_const);
   AstNode* ParseVariableDeclarationList();
   AstNode* ParseFunctionStatement(bool is_literal);
   AstNode* ParseStatement();
   SequenceNode* ParseNestedStatement(bool parsing_loop_body,
                                      SourceLabel* label);
   void ParseStatementSequence();
   bool IsIdentifier();
   bool IsFunctionTypeAliasName();
-  bool IsTypeParameter();
-  bool IsOptionalType();
-  bool IsReturnType();
+  bool TryParseTypeParameter();
+  bool TryParseOptionalType();
+  bool TryParseReturnType();
   bool IsVariableDeclaration();
   bool IsFunctionDeclaration();
   bool IsFunctionLiteral();
   bool IsForInStatement();
   bool IsTopLevelAccessor();
   bool IsTopLevelFunction();
 
   AstNode* ParseBinaryExpr(int min_preced);
   LiteralNode* ParseConstExpr();
   static const bool kRequireConst = true;
@@ skipping 109 matching lines @@
   // code at all points in the try block where an exit from the block is
   // done using 'return', 'break' or 'continue' statements.
   TryBlocks* try_blocks_list_;
 
   DISALLOW_COPY_AND_ASSIGN(Parser);
 };
 
 }  // namespace dart
 
 #endif  // VM_PARSER_H_