RegExp bitmap test for word character.

src/regexp-macro-assembler.h

 // Copyright 2008 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 186 matching lines @@
 
   // Called from RegExp if the backtrack stack limit is hit.
   // Tries to expand the stack. Returns the new stack-pointer if
   // successful, and updates the stack_top address, or returns 0 if unable
   // to grow the stack.
   // This function must not trigger a garbage collection.
   static Address GrowStack(Address stack_pointer, Address* stack_top);
 
   static const byte* StringCharacterPosition(String* subject, int start_index);
 
+  // Byte map of ASCII characters with a 0xff if the character is a word
+  // character (digit, letter or underscore) and 0x00 otherwise.
+  // Used by generated RegExp code.
+  static byte word_character_map[128];
+
+  static Address word_character_map_address() {
+    return &word_character_map[0];
+  }
+
   static Result Execute(Code* code,
                         String* input,
                         int start_offset,
                         const byte* input_start,
                         const byte* input_end,
                         int* output,
                         bool at_start);
 };
 
 #endif  // V8_NATIVE_REGEXP
 
 } }  // namespace v8::internal
 
 #endif  // V8_REGEXP_MACRO_ASSEMBLER_H_