Improvements to 53-bit overflow checking.

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 "lib/invocation_mirror.h"
@@ skipping 283 matching lines @@
                                   const char* message_header,
                                   const char* format,
                                   va_list args);
 
   // Reports error/warning message at location of current token.
   void ErrorMsg(const char* msg, ...) PRINTF_ATTRIBUTE(2, 3);
   void Warning(const char* msg, ...)  PRINTF_ATTRIBUTE(2, 3);
   void Unimplemented(const char* msg);
 
   // Reports error message at given location.
-  void ErrorMsg(intptr_t token_pos, const char* msg, ...)
+  void ErrorMsg(intptr_t token_pos, const char* msg, ...) const
       PRINTF_ATTRIBUTE(3, 4);
   void Warning(intptr_t token_pos, const char* msg, ...)
       PRINTF_ATTRIBUTE(3, 4);
 
   // Reports an already formatted error message.
   void ErrorMsg(const Error& error);
 
   // Concatenates two error messages, the previous and the current one.
   void AppendErrorMsg(
       const Error& prev_error, intptr_t token_pos, const char* format, ...)
@@ skipping 359 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_