Add an IC for CompareNil operations

src/type-info.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 200 matching lines @@
     Map* first_map = code->FindFirstMap();
     ASSERT(first_map != NULL);
     return CanRetainOtherContext(first_map, *native_context_)
         ? Handle<Map>::null()
         : Handle<Map>(first_map);
   }
   return Handle<Map>::cast(map_or_code);
 }
 
 
+Handle<Map> TypeFeedbackOracle::CompareNilMonomorphicReceiverType(
+    TypeFeedbackId id) {
+  Handle<Object> maybe_code = GetInfo(id);
+  if (maybe_code->IsCode()) {
+    Map* first_map = Handle<Code>::cast(maybe_code)->FindFirstMap();
+    if (first_map != NULL) return Handle<Map>(first_map);
+  }
+  return Handle<Map>();
+}
+
+
 KeyedAccessStoreMode TypeFeedbackOracle::GetStoreMode(
     TypeFeedbackId ast_id) {
   Handle<Object> map_or_code = GetInfo(ast_id);
   if (map_or_code->IsCode()) {
     Handle<Code> code = Handle<Code>::cast(map_or_code);
     if (code->kind() == Code::KEYED_STORE_IC) {
       return Code::GetKeyedAccessStoreMode(code->extra_ic_state());
     }
   }
   return STANDARD_STORE;
@@ skipping 387 matching lines @@
   Handle<Object> object = GetInfo(ast_id);
   if (!object->IsCode()) return;
   Handle<Code> code = Handle<Code>::cast(object);
   if (code->kind() == Code::KEYED_LOAD_IC ||
       code->kind() == Code::KEYED_STORE_IC) {
     CollectPolymorphicMaps(code, types);
   }
 }
 
 
-byte TypeFeedbackOracle::ToBooleanTypes(TypeFeedbackId ast_id) {
-  Handle<Object> object = GetInfo(ast_id);
+byte TypeFeedbackOracle::ToBooleanTypes(TypeFeedbackId id) {
+  Handle<Object> object = GetInfo(id);
   return object->IsCode() ? Handle<Code>::cast(object)->to_boolean_state() : 0;
 }
 
 
+byte TypeFeedbackOracle::CompareNilTypes(TypeFeedbackId id) {
+  Handle<Object> object = GetInfo(id);
+  if (object->IsCode()) {
+    return Handle<Code>::cast(object)->compare_nil_state();
+  } else {
+    return 0;
+  }
+}
+
+
 // Things are a bit tricky here: The iterator for the RelocInfos and the infos
 // themselves are not GC-safe, so we first get all infos, then we create the
 // dictionary (possibly triggering GC), and finally we relocate the collected
 // infos before we process them.
 void TypeFeedbackOracle::BuildDictionary(Handle<Code> code) {
   AssertNoAllocation no_allocation;
   ZoneList<RelocInfo> infos(16, zone());
   HandleScope scope(isolate_);
   GetRelocInfos(code, &infos);
   CreateDictionary(code, &infos);
@@ skipping 73 matching lines @@
         if (target->ic_state() == MONOMORPHIC ||
             target->ic_state() == POLYMORPHIC) {
           SetInfo(ast_id, target);
         }
         break;
 
       case Code::UNARY_OP_IC:
       case Code::BINARY_OP_IC:
       case Code::COMPARE_IC:
       case Code::TO_BOOLEAN_IC:
+      case Code::COMPARE_NIL_IC:
         SetInfo(ast_id, target);
         break;
 
       default:
         break;
     }
   }
 }
 
 
@@ skipping 22 matching lines @@
   USE(maybe_result);
 #ifdef DEBUG
   Object* result = NULL;
   // Dictionary has been allocated with sufficient size for all elements.
   ASSERT(maybe_result->ToObject(&result));
   ASSERT(*dictionary_ == result);
 #endif
 }
 
 } }  // namespace v8::internal