Simpler (and a bit faster) keyword matcher

src/token.h

 // Copyright 2011 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
@@ skipping 23 matching lines @@
 namespace internal {
 
 // TOKEN_LIST takes a list of 3 macros M, all of which satisfy the
 // same signature M(name, string, precedence), where name is the
 // symbolic token name, string is the corresponding syntactic symbol
 // (or NULL, for literals), and precedence is the precedence (or 0).
 // The parameters are invoked for token categories as follows:
 //
 //   T: Non-keyword tokens
 //   K: Keyword tokens
-//   F: Future (reserved) keyword tokens
 
 // IGNORE_TOKEN is a convenience macro that can be supplied as
 // an argument (at any position) for a TOKEN_LIST call. It does
 // nothing with tokens belonging to the respective category.
 
 #define IGNORE_TOKEN(name, string, precedence)
 
-#define TOKEN_LIST(T, K, F)                                             \
+#define TOKEN_LIST(T, K)                                                \
   /* End of source indicator. */                                        \
   T(EOS, "EOS", 0)                                                      \
                                                                         \
   /* Punctuators (ECMA-262, section 7.7, page 15). */                   \
   T(LPAREN, "(", 0)                                                     \
   T(RPAREN, ")", 0)                                                     \
   T(LBRACK, "[", 0)                                                     \
   T(RBRACK, "]", 0)                                                     \
   T(LBRACE, "{", 0)                                                     \
   T(RBRACE, "}", 0)                                                     \
@@ skipping 112 matching lines @@
                                                                         \
   /* Scanner-internal use only. */                                      \
   T(WHITESPACE, NULL, 0)
 
 
 class Token {
  public:
   // All token values.
 #define T(name, string, precedence) name,
   enum Value {
-    TOKEN_LIST(T, T, IGNORE_TOKEN)
+    TOKEN_LIST(T, T)
     NUM_TOKENS
   };
 #undef T
 
   // Returns a string corresponding to the C++ token name
   // (e.g. "LT" for the token LT).
   static const char* Name(Value tok) {
     ASSERT(tok < NUM_TOKENS);  // tok is unsigned
     return name_[tok];
   }
@@ skipping 83 matching lines @@
  private:
   static const char* const name_[NUM_TOKENS];
   static const char* const string_[NUM_TOKENS];
   static const int8_t precedence_[NUM_TOKENS];
   static const char token_type[NUM_TOKENS];
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_TOKEN_H_