Wrap messages implementation in a function.

tools/js2c.py

 #!/usr/bin/env python
 #
 # Copyright 2012 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
@@ skipping 51 matching lines @@
   file = open(filename, "rt")
   try:
     lines = file.read()
   finally:
     file.close()
   return lines
 
 
 EVAL_PATTERN = re.compile(r'\beval\s*\(')
 WITH_PATTERN = re.compile(r'\bwith\s*\(')
-INVALID_ERROR_MESSAGE_PATTERN = re.compile(r'Make\w*Error\(([kA-Z]\w+)')
-NEW_ERROR_PATTERN = re.compile(r'new \$\w*Error\((?!\))');
+INVALID_ERROR_MESSAGE_PATTERN = re.compile(
+    r'Make(?!Generic)\w*Error\(([kA-Z]\w+)')
+NEW_ERROR_PATTERN = re.compile(r'new \$\w*Error\((?!\))')
 
 def Validate(lines):
   # Because of simplified context setup, eval and with is not
   # allowed in the natives files.
   if EVAL_PATTERN.search(lines):
     raise Error("Eval disallowed in natives.")
   if WITH_PATTERN.search(lines):
     raise Error("With statements disallowed in natives.")
   invalid_error = INVALID_ERROR_MESSAGE_PATTERN.search(lines)
   if invalid_error:
@@ skipping 476 matching lines @@
       out.cc: C code to be generated.
       type: type parameter for NativesCollection template.
       sources.js: JS internal sources or macros.py.""")
   (options, args) = parser.parse_args()
 
   JS2C(args[2:], args[0], args[1], options.raw, options.startup_blob)
 
 
 if __name__ == "__main__":
   main()