Implement a type recording ToBoolean IC.

src/ic.cc

 // 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 291 matching lines @@
     case Code::KEYED_LOAD_IC:
       return KeyedLoadIC::Clear(address, target);
     case Code::STORE_IC: return StoreIC::Clear(address, target);
     case Code::KEYED_STORE_IC:
       return KeyedStoreIC::Clear(address, target);
     case Code::CALL_IC: return CallIC::Clear(address, target);
     case Code::KEYED_CALL_IC:  return KeyedCallIC::Clear(address, target);
     case Code::UNARY_OP_IC:
     case Code::BINARY_OP_IC:
     case Code::COMPARE_IC:
+    case Code::TO_BOOLEAN_IC:
       // Clearing these is tricky and does not
       // make any performance difference.
       return;
     default: UNREACHABLE();
   }
 }
 
 
 void CallICBase::Clear(Address address, Code* target) {
   bool contextual = CallICBase::Contextual::decode(target->extra_ic_state());
@@ skipping 513 matching lines @@
   ReceiverToObjectIfRequired(result, object);
 
   if (result->IsJSFunction()) return *result;
   result = Handle<Object>(TryCallAsFunction(*result));
   if (result->IsJSFunction()) return *result;
 
   return TypeError("property_not_function", object, key);
 }
 
 
-#ifdef DEBUG
-#define TRACE_IC_NAMED(msg, name) \
-  if (FLAG_trace_ic) PrintF(msg, *(name)->ToCString())
-#else
-#define TRACE_IC_NAMED(msg, name)
-#endif
-
-
 MaybeObject* LoadIC::Load(State state,
                           Handle<Object> object,
                           Handle<String> name) {
   // If the object is undefined or null it's illegal to try to get any
   // of its properties; throw a TypeError in that case.
   if (object->IsUndefined() || object->IsNull()) {
     return TypeError("non_object_property_load", object, name);
   }
 
   if (FLAG_use_ic) {
@@ skipping 1636 matching lines @@
 // Used from ic_<arch>.cc.
 RUNTIME_FUNCTION(Code*, CompareIC_Miss) {
   NoHandleAllocation na;
   ASSERT(args.length() == 3);
   CompareIC ic(isolate, static_cast<Token::Value>(args.smi_at(2)));
   ic.UpdateCaches(args.at<Object>(0), args.at<Object>(1));
   return ic.target();
 }
 
 
+RUNTIME_FUNCTION(MaybeObject*, ToBoolean_Patch) {
+  ASSERT(args.length() == 3);
+
+  HandleScope scope(isolate);
+  Handle<Object> object = args.at<Object>(0);
+  Register tos = Register::from_code(args.smi_at(1));
+  ToBooleanStub::Types old_types(args.smi_at(2));
+
+  ToBooleanStub::Types new_types(old_types);
+  bool to_boolean_value = new_types.Record(object);
+  old_types.TraceTransition(new_types);
+
+  ToBooleanStub stub(tos, new_types);
+  Handle<Code> code = stub.GetCode();
+  ToBooleanIC ic(isolate);
+  ic.patch(*code);
+  return Smi::FromInt(to_boolean_value ? 1 : 0);
+}
+
+
+void ToBooleanIC::patch(Code* code) {
+  set_target(code);
+}
+
+
 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