Faster string.replace with regexp pattern.

src/objects-inl.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 2298 matching lines @@
 
 
 JSRegExp::Type JSRegExp::TypeTag() {
   Object* data = this->data();
   if (data->IsUndefined()) return JSRegExp::NOT_COMPILED;
   Smi* smi = Smi::cast(FixedArray::cast(data)->get(kTagIndex));
   return static_cast<JSRegExp::Type>(smi->value());
 }
 
 
+int JSRegExp::CaptureCount() {
+  switch (TypeTag()) {
+    case ATOM:
+      return 0;
+    case IRREGEXP:
+      return Smi::cast(DataAt(kIrregexpCaptureCountIndex))->value();
+    default:
+      UNREACHABLE();
+      return -1;
+  }
+}
+
+
 JSRegExp::Flags JSRegExp::GetFlags() {
   ASSERT(this->data()->IsFixedArray());
   Object* data = this->data();
   Smi* smi = Smi::cast(FixedArray::cast(data)->get(kFlagsIndex));
   return Flags(smi->value());
 }
 
 
 String* JSRegExp::Pattern() {
   ASSERT(this->data()->IsFixedArray());
@@ skipping 231 matching lines @@
 #undef WRITE_INT_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_