Compare IC: add STRINGS state.

src/ic.cc

 // Copyright 2006-2009 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 2123 matching lines @@
   return static_cast<State>(target->compare_state());
 }
 
 
 const char* CompareIC::GetStateName(State state) {
   switch (state) {
     case UNINITIALIZED: return "UNINITIALIZED";
     case SMIS: return "SMIS";
     case HEAP_NUMBERS: return "HEAP_NUMBERS";
     case OBJECTS: return "OBJECTS";
+    case STRINGS: return "STRINGS";
     case GENERIC: return "GENERIC";
     default:
       UNREACHABLE();
       return NULL;
   }
 }
 
 
 CompareIC::State CompareIC::TargetState(State state,
                                         bool has_inlined_smi_code,
                                         Handle<Object> x,
                                         Handle<Object> y) {
   if (!has_inlined_smi_code && state != UNINITIALIZED) return GENERIC;
   if (state == UNINITIALIZED && x->IsSmi() && y->IsSmi()) return SMIS;
   if ((state == UNINITIALIZED || (state == SMIS && has_inlined_smi_code)) &&
       x->IsNumber() && y->IsNumber()) return HEAP_NUMBERS;
   if (op_ != Token::EQ && op_ != Token::EQ_STRICT) return GENERIC;
   if (state == UNINITIALIZED &&
+      x->IsString() && y->IsString()) return STRINGS;
+  if (state == UNINITIALIZED &&
       x->IsJSObject() && y->IsJSObject()) return OBJECTS;
   return GENERIC;
 }
 
 
 // Used from ic_<arch>.cc.
 RUNTIME_FUNCTION(Code*, CompareIC_Miss) {
   NoHandleAllocation na;
   ASSERT(args.length() == 3);
   CompareIC ic(isolate, static_cast<Token::Value>(Smi::cast(args[2])->value()));
   ic.UpdateCaches(args.at<Object>(0), args.at<Object>(1));
   return ic.target();
 }
 
 
 static const Address IC_utilities[] = {
 #define ADDR(name) FUNCTION_ADDR(name),
     IC_UTIL_LIST(ADDR)
     NULL
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal