Encapsulating Type information in the CompareICStub

src/ic.cc

 // Copyright 2012 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 2863 matching lines @@
 // Used from ICCompareStub::GenerateMiss in code-stubs-<arch>.cc.
 RUNTIME_FUNCTION(Code*, CompareIC_Miss) {
   NoHandleAllocation na(isolate);
   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();
 }
 
 
-Code* CompareNilIC::GetRawUninitialized(EqualityKind kind,
-                                        NilValue nil) {
-  CompareNilICStub stub(kind, nil);
-  Code* code = NULL;
-  CHECK(stub.FindCodeInCache(&code, Isolate::Current()));
-  return code;
-}
-
-
 void CompareNilIC::Clear(Address address, Code* target) {
   if (target->ic_state() == UNINITIALIZED) return;
   Code::ExtraICState state = target->extended_extra_ic_state();
 
-  EqualityKind kind =
-      CompareNilICStub::EqualityKindFromExtraICState(state);
-  NilValue nil =
-      CompareNilICStub::NilValueFromExtraICState(state);
+  CompareNilICStub stub(state, CompareNilICStub::CODE_STUB_IS_MISS);
+  stub.ClearTypes();
 
-  SetTargetAtAddress(address, GetRawUninitialized(kind, nil));
+  Code* code = NULL;
+  CHECK(stub.FindCodeInCache(&code, target->GetIsolate()));
+
+  SetTargetAtAddress(address, code);
 }
 
 
 MaybeObject* CompareNilIC::DoCompareNilSlow(EqualityKind kind,
                                             NilValue nil,
                                             Handle<Object> object) {
   if (kind == kStrictEquality) {
     if (nil == kNullValue) {
       return Smi::FromInt(object->IsNull());
     } else {
       return Smi::FromInt(object->IsUndefined());
     }
   }
   if (object->IsNull() || object->IsUndefined()) {
     return Smi::FromInt(true);
   }
   return Smi::FromInt(object->IsUndetectableObject());
 }
 
 
 MaybeObject* CompareNilIC::CompareNil(Handle<Object> object) {
   Code::ExtraICState extra_ic_state = target()->extended_extra_ic_state();
 
+  CompareNilICStub stub(extra_ic_state);
+
   // Extract the current supported types from the patched IC and calculate what
   // types must be supported as a result of the miss.
-  bool already_monomorphic;
-  CompareNilICStub::Types types =
-      CompareNilICStub::GetPatchedICFlags(extra_ic_state,
-                                          object, &already_monomorphic);
+  bool already_monomorphic = stub.IsMonomorphic();
 
-  EqualityKind kind =
-      CompareNilICStub::EqualityKindFromExtraICState(extra_ic_state);
-  NilValue nil =
-      CompareNilICStub::NilValueFromExtraICState(extra_ic_state);
+  stub.Record(object);
+
+  EqualityKind kind = stub.GetKind();
+  NilValue nil = stub.GetNilValue();
 
   // Find or create the specialized stub to support the new set of types.
-  CompareNilICStub stub(kind, nil, types);
   Handle<Code> code;
-  if ((types & CompareNilICStub::kCompareAgainstMonomorphicMap) != 0) {
+  if (stub.IsMonomorphic()) {
     Handle<Map> monomorphic_map(already_monomorphic
                                 ? target()->FindFirstMap()
                                 : HeapObject::cast(*object)->map());
-    code = isolate()->stub_cache()->ComputeCompareNil(monomorphic_map,
-                                                      nil,
-                                                      stub.GetTypes());
+    code = isolate()->stub_cache()->ComputeCompareNil(monomorphic_map, stub);
   } else {
     code = stub.GetCode(isolate());
   }
 
   patch(*code);
 
   return DoCompareNilSlow(kind, nil, object);
 }
 
 
@@ skipping 49 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal