Attempt at pre-calculating replace regexp matches.

src/jsregexp.h

 // Copyright 2006-2008 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 127 matching lines @@
 
   static void SetCapture(FixedArray* array, int index, int to) {
     array->set(index + kFirstCapture, Smi::FromInt(to));
   }
 
   static int GetLastCaptureCount(FixedArray* array) {
     return Smi::cast(array->get(kLastCaptureCount))->value();
   }
 
   // For acting on the JSRegExp data FixedArray.
+  static bool RegExpIsAtom(FixedArray* re) {
+    return re->get(JSRegExp::kTagIndex) == Smi::FromInt(JSRegExp::ATOM);
+  }
+  static int RegExpNumberOfCaptures(FixedArray* re) {
+    return (re->get(JSRegExp::kTagIndex) == Smi::FromInt(JSRegExp::ATOM))
+           ? 0
+           : IrregexpNumberOfCaptures(re);
+  }
   static int IrregexpMaxRegisterCount(FixedArray* re);
   static void SetIrregexpMaxRegisterCount(FixedArray* re, int value);
   static int IrregexpNumberOfCaptures(FixedArray* re);
   static int IrregexpNumberOfRegisters(FixedArray* re);
   static ByteArray* IrregexpByteCode(FixedArray* re, bool is_ascii);
   static Code* IrregexpNativeCode(FixedArray* re, bool is_ascii);
 
  private:
   static String* last_ascii_string_;
   static String* two_byte_cached_string_;
@@ skipping 1273 matching lines @@
   int offsets_vector_length_;
   static int static_offsets_vector_[kStaticOffsetsVectorSize];
 
   friend class ExternalReference;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_