Flesh out vector ic state query and set mechanisms.

src/ic/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/arguments.h"
 #include "src/base/bits.h"
@@ skipping 240 matching lines @@
         return;
     }
   }
 }
 
 
 bool IC::TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
                                                 Handle<String> name) {
   if (!IsNameCompatibleWithPrototypeFailure(name)) return false;
   Handle<Map> receiver_map = TypeToMap(*receiver_type(), isolate());
-  maybe_handler_ = target()->FindHandlerForMap(*receiver_map);
+  if (UseVector()) {
+    maybe_handler_ = nexus()->FindHandlerForMap(receiver_map);
+  } else {
+    maybe_handler_ = target()->FindHandlerForMap(*receiver_map);
+  }
 
   // The current map wasn't handled yet. There's no reason to stay monomorphic,
   // *unless* we're moving from a deprecated map to its replacement, or
   // to a more general elements kind.
   // TODO(verwaest): Check if the current map is actually what the old map
   // would transition to.
   if (maybe_handler_.is_null()) {
     if (!receiver_map->IsJSObjectMap()) return false;
     Map* first_map = FirstTargetMap();
     if (first_map == NULL) return false;
@@ skipping 31 matching lines @@
   }
 
   return true;
 }
 
 
 bool IC::IsNameCompatibleWithPrototypeFailure(Handle<Object> name) {
   if (target()->is_keyed_stub()) {
     // Determine whether the failure is due to a name failure.
     if (!name->IsName()) return false;
-    Name* stub_name = target()->FindFirstName();
+    Name* stub_name =
+        UseVector() ? nexus()->FindFirstName() : target()->FindFirstName();
     if (*name != stub_name) return false;
   }
 
   return true;
 }
 
 
 void IC::UpdateState(Handle<Object> receiver, Handle<Object> name) {
   update_receiver_type(receiver);
   if (!name->IsString()) return;
@@ skipping 121 matching lines @@
   isolate->runtime_profiler()->NotifyICChanged();
   // TODO(2029): When an optimized function is patched, it would
   // be nice to propagate the corresponding type information to its
   // unoptimized version for the benefit of later inlining.
 }
 
 
 void IC::PostPatching(Address address, Code* target, Code* old_target) {
   // Type vector based ICs update these statistics at a different time because
   // they don't always patch on state change.
-  if (target->kind() == Code::CALL_IC) return;
+  if (ICUseVector(target->kind())) return;
 
   Isolate* isolate = target->GetHeap()->isolate();
   State old_state = UNINITIALIZED;
   State new_state = UNINITIALIZED;
   bool target_remains_ic_stub = false;
   if (old_target->is_inline_cache_stub() && target->is_inline_cache_stub()) {
     old_state = old_target->ic_state();
     new_state = target->ic_state();
     target_remains_ic_stub = true;
   }
@@ skipping 41 matching lines @@
 
 void IC::Clear(Isolate* isolate, Address address,
                ConstantPoolArray* constant_pool) {
   Code* target = GetTargetAtAddress(address, constant_pool);
 
   // Don't clear debug break inline cache as it will remove the break point.
   if (target->is_debug_stub()) return;
 
   switch (target->kind()) {
     case Code::LOAD_IC:
+      if (FLAG_vector_ics) return;
       return LoadIC::Clear(isolate, address, target, constant_pool);
     case Code::KEYED_LOAD_IC:
+      if (FLAG_vector_ics) return;
       return KeyedLoadIC::Clear(isolate, address, target, constant_pool);
     case Code::STORE_IC:
       return StoreIC::Clear(isolate, address, target, constant_pool);
     case Code::KEYED_STORE_IC:
       return KeyedStoreIC::Clear(isolate, address, target, constant_pool);
     case Code::COMPARE_IC:
       return CompareIC::Clear(isolate, address, target, constant_pool);
     case Code::COMPARE_NIL_IC:
       return CompareNilIC::Clear(address, target, constant_pool);
     case Code::CALL_IC:  // CallICs are vector-based and cleared differently.
     case Code::BINARY_OP_IC:
     case Code::TO_BOOLEAN_IC:
       // Clearing these is tricky and does not
       // make any performance difference.
       return;
     default:
       UNREACHABLE();
   }
 }
 
 
-template <class Nexus>
-void IC::Clear(Isolate* isolate, Code::Kind kind, Code* host, Nexus* nexus) {
-  switch (kind) {
-    case Code::CALL_IC:
-      return CallIC::Clear(isolate, host, nexus);
-    default:
-      UNREACHABLE();
-  }
-}
-
-
-// Force instantiation of template instances for vector-based IC clearing.
-template void IC::Clear(Isolate*, Code::Kind, Code*, CallICNexus*);
-
-
 void KeyedLoadIC::Clear(Isolate* isolate, Address address, Code* target,
                         ConstantPoolArray* constant_pool) {
+  DCHECK(!FLAG_vector_ics);
   if (IsCleared(target)) return;
 
   // Make sure to also clear the map used in inline fast cases.  If we
   // do not clear these maps, cached code can keep objects alive
   // through the embedded maps.
   SetTargetAtAddress(address, *pre_monomorphic_stub(isolate), constant_pool);
 }
 
 
+void KeyedLoadIC::Clear(Isolate* isolate, Code* host, KeyedLoadICNexus* nexus) {
+  if (IsCleared(nexus)) return;
+  // Make sure to also clear the map used in inline fast cases.  If we
+  // do not clear these maps, cached code can keep objects alive
+  // through the embedded maps.
+  State state = nexus->StateFromFeedback();
+  nexus->ConfigurePremonomorphic();
+  OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, PREMONOMORPHIC);
+}
+
+
 void CallIC::Clear(Isolate* isolate, Code* host, CallICNexus* nexus) {
   // Determine our state.
   Object* feedback = nexus->vector()->Get(nexus->slot());
   State state = nexus->StateFromFeedback();
 
   if (state != UNINITIALIZED && !feedback->IsAllocationSite()) {
     nexus->ConfigureUninitialized();
     // The change in state must be processed.
     OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, UNINITIALIZED);
   }
 }
 
 
 void LoadIC::Clear(Isolate* isolate, Address address, Code* target,
                    ConstantPoolArray* constant_pool) {
+  DCHECK(!FLAG_vector_ics);
   if (IsCleared(target)) return;
   Code* code = PropertyICCompiler::FindPreMonomorphic(isolate, Code::LOAD_IC,
                                                       target->extra_ic_state());
   SetTargetAtAddress(address, code, constant_pool);
 }
 
 
+void LoadIC::Clear(Isolate* isolate, Code* host, LoadICNexus* nexus) {
+  if (IsCleared(nexus)) return;
+  State state = nexus->StateFromFeedback();
+  nexus->ConfigurePremonomorphic();
+  OnTypeFeedbackChanged(isolate, host, nexus->vector(), state, PREMONOMORPHIC);
+}
+
+
 void StoreIC::Clear(Isolate* isolate, Address address, Code* target,
                     ConstantPoolArray* constant_pool) {
   if (IsCleared(target)) return;
   Code* code = PropertyICCompiler::FindPreMonomorphic(isolate, Code::STORE_IC,
                                                       target->extra_ic_state());
   SetTargetAtAddress(address, code, constant_pool);
 }
 
 
 void KeyedStoreIC::Clear(Isolate* isolate, Address address, Code* target,
@@ skipping 30 matching lines @@
 
 static bool MigrateDeprecated(Handle<Object> object) {
   if (!object->IsJSObject()) return false;
   Handle<JSObject> receiver = Handle<JSObject>::cast(object);
   if (!receiver->map()->is_deprecated()) return false;
   JSObject::MigrateInstance(Handle<JSObject>::cast(object));
   return true;
 }
 
 
+void IC::ConfigureVectorState(IC::State new_state) {
+  DCHECK(UseVector());
+  if (kind() == Code::LOAD_IC) {
+    LoadICNexus* nexus = casted_nexus<LoadICNexus>();
+    if (new_state == PREMONOMORPHIC) {
+      nexus->ConfigurePremonomorphic();
+    } else if (new_state == MEGAMORPHIC) {
+      nexus->ConfigureMegamorphic();
+    } else {
+      UNREACHABLE();
+    }
+  } else if (kind() == Code::KEYED_LOAD_IC) {
+    KeyedLoadICNexus* nexus = casted_nexus<KeyedLoadICNexus>();
+    if (new_state == GENERIC) {
+      nexus->ConfigureGeneric();
+    } else if (new_state == PREMONOMORPHIC) {
+      nexus->ConfigurePremonomorphic();
+    } else if (new_state == MEGAMORPHIC) {
+      nexus->ConfigureMegamorphic();
+    } else {
+      UNREACHABLE();
+    }
+  } else {
+    UNREACHABLE();
+  }
+
+  OnTypeFeedbackChanged(isolate(), get_host(), *vector(), saved_state(),
+                        new_state);
+}
+
+
+void IC::ConfigureVectorState(Handle<Name> name, Handle<HeapType> type,
+                              Handle<Code> handler) {
+  DCHECK(UseVector());
+  if (kind() == Code::LOAD_IC) {
+    LoadICNexus* nexus = casted_nexus<LoadICNexus>();
+    nexus->ConfigureMonomorphic(type, handler);
+  } else {
+    DCHECK(kind() == Code::KEYED_LOAD_IC);
+    KeyedLoadICNexus* nexus = casted_nexus<KeyedLoadICNexus>();
+    nexus->ConfigureMonomorphic(name, type, handler);
+  }
+
+  OnTypeFeedbackChanged(isolate(), get_host(), *vector(), saved_state(),
+                        MONOMORPHIC);
+}
+
+
+void IC::ConfigureVectorState(Handle<Name> name, TypeHandleList* types,
+                              CodeHandleList* handlers) {
+  DCHECK(UseVector());
+  if (kind() == Code::LOAD_IC) {
+    LoadICNexus* nexus = casted_nexus<LoadICNexus>();
+    nexus->ConfigurePolymorphic(types, handlers);
+  } else {
+    DCHECK(kind() == Code::KEYED_LOAD_IC);
+    KeyedLoadICNexus* nexus = casted_nexus<KeyedLoadICNexus>();
+    nexus->ConfigurePolymorphic(name, types, handlers);
+  }
+
+  OnTypeFeedbackChanged(isolate(), get_host(), *vector(), saved_state(),
+                        POLYMORPHIC);
+}
+
+
 MaybeHandle<Object> LoadIC::Load(Handle<Object> object, Handle<Name> 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);
   }
 
   // Check if the name is trivially convertible to an index and get
   // the element or char if so.
   uint32_t index;
   if (kind() == Code::KEYED_LOAD_IC && name->AsArrayIndex(&index)) {
     // Rewrite to the generic keyed load stub.
     if (FLAG_use_ic) {
-      set_target(*KeyedLoadIC::generic_stub(isolate()));
+      if (UseVector()) {
+        ConfigureVectorState(GENERIC);
+      } else {
+        set_target(*KeyedLoadIC::generic_stub(isolate()));
+      }
       TRACE_IC("LoadIC", name);
       TRACE_GENERIC_IC(isolate(), "LoadIC", "name as array index");
     }
     Handle<Object> result;
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate(), result,
         Runtime::GetElementOrCharAt(isolate(), object, index), Object);
     return result;
   }
 
@@ skipping 84 matching lines @@
                                                *type->AsClass()->Map())) {
       handler_to_overwrite = i;
     }
   }
 
   int number_of_valid_types =
       number_of_types - deprecated_types - (handler_to_overwrite != -1);
 
   if (number_of_valid_types >= 4) return false;
   if (number_of_types == 0) return false;
-  if (!target()->FindHandlers(&handlers, types.length())) return false;
+  if (UseVector()) {
+    if (!nexus()->FindHandlers(&handlers, types.length())) return false;
+  } else {
+    if (!target()->FindHandlers(&handlers, types.length())) return false;
+  }
 
   number_of_valid_types++;
   if (number_of_valid_types > 1 && target()->is_keyed_stub()) return false;
   Handle<Code> ic;
   if (number_of_valid_types == 1) {
-    ic = PropertyICCompiler::ComputeMonomorphic(kind(), name, type, code,
-                                                extra_ic_state());
+    if (UseVector()) {
+      ConfigureVectorState(name, receiver_type(), code);
+    } else {
+      ic = PropertyICCompiler::ComputeMonomorphic(kind(), name, type, code,
+                                                  extra_ic_state());
+    }
   } else {
     if (handler_to_overwrite >= 0) {
       handlers.Set(handler_to_overwrite, code);
       if (!type->NowIs(types.at(handler_to_overwrite))) {
         types.Set(handler_to_overwrite, type);
       }
     } else {
       types.Add(type);
       handlers.Add(code);
     }
-    ic = PropertyICCompiler::ComputePolymorphic(kind(), &types, &handlers,
-                                                number_of_valid_types, name,
-                                                extra_ic_state());
+
+    if (UseVector()) {
+      ConfigureVectorState(name, &types, &handlers);
+    } else {
+      ic = PropertyICCompiler::ComputePolymorphic(kind(), &types, &handlers,
+                                                  number_of_valid_types, name,
+                                                  extra_ic_state());
+    }
   }
-  set_target(*ic);
+
+  if (!UseVector()) set_target(*ic);
   return true;
 }
 
 
 Handle<HeapType> IC::CurrentTypeOf(Handle<Object> object, Isolate* isolate) {
   return object->IsJSGlobalObject()
              ? HeapType::Constant(Handle<JSGlobalObject>::cast(object), isolate)
              : HeapType::NowOf(object, isolate);
 }
 
@@ skipping 27 matching lines @@
 
 template Type* IC::MapToType<Type>(Handle<Map> map, Zone* zone);
 
 
 template Handle<HeapType> IC::MapToType<HeapType>(Handle<Map> map,
                                                   Isolate* region);
 
 
 void IC::UpdateMonomorphicIC(Handle<Code> handler, Handle<Name> name) {
   DCHECK(handler->is_handler());
-  Handle<Code> ic = PropertyICCompiler::ComputeMonomorphic(
-      kind(), name, receiver_type(), handler, extra_ic_state());
-  set_target(*ic);
+  if (UseVector()) {
+    ConfigureVectorState(name, receiver_type(), handler);
+  } else {
+    Handle<Code> ic = PropertyICCompiler::ComputeMonomorphic(
+        kind(), name, receiver_type(), handler, extra_ic_state());
+    set_target(*ic);
+  }
 }
 
 
 void IC::CopyICToMegamorphicCache(Handle<Name> name) {
   TypeHandleList types;
   CodeHandleList handlers;
   TargetTypes(&types);
   if (!target()->FindHandlers(&handlers, types.length())) return;
   for (int i = 0; i < types.length(); i++) {
     UpdateMegamorphicCache(*types.at(i), *name, *handlers.at(i));
@@ skipping 24 matching lines @@
       break;
     case PROTOTYPE_FAILURE:
     case MONOMORPHIC:
     case POLYMORPHIC:
       if (!target()->is_keyed_stub() || state() == PROTOTYPE_FAILURE) {
         if (UpdatePolymorphicIC(name, code)) break;
         // For keyed stubs, we can't know whether old handlers were for the
         // same key.
         CopyICToMegamorphicCache(name);
       }
-      set_target(*megamorphic_stub());
+      if (UseVector()) {
+        ConfigureVectorState(MEGAMORPHIC);
+      } else {
+        set_target(*megamorphic_stub());
+      }
     // Fall through.
     case MEGAMORPHIC:
       UpdateMegamorphicCache(*receiver_type(), *name, *code);
       // Indicate that we've handled this case.
       target_set_ = true;
       break;
     case DEBUG_STUB:
       break;
     case DEFAULT:
       UNREACHABLE();
       break;
     case GENERIC:
       // The generic keyed store stub re-uses store handlers, which can miss.
       // That's ok, no reason to do anything.
       DCHECK(target()->kind() == Code::KEYED_STORE_IC);
       break;
   }
 }
 
 
 Handle<Code> LoadIC::initialize_stub(Isolate* isolate,
                                      ExtraICState extra_state) {
+  if (FLAG_vector_ics) {
+    return LoadICTrampolineStub(isolate, LoadICState(extra_state)).GetCode();
+  }
+
   return PropertyICCompiler::ComputeLoad(isolate, UNINITIALIZED, extra_state);
 }
 
 
 Handle<Code> LoadIC::initialize_stub_in_optimized_code(
     Isolate* isolate, ExtraICState extra_state) {
   if (FLAG_vector_ics) {
     return VectorLoadStub(isolate, LoadICState(extra_state)).GetCode();
   }
   return initialize_stub(isolate, extra_state);
@@ skipping 23 matching lines @@
     return stub.GetCode();
   } else {
     DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
     return KeyedLoadIC::generic_stub(isolate());
   }
 }
 
 
 Handle<Code> LoadIC::pre_monomorphic_stub(Isolate* isolate,
                                           ExtraICState extra_state) {
+  DCHECK(!FLAG_vector_ics);
   return PropertyICCompiler::ComputeLoad(isolate, PREMONOMORPHIC, extra_state);
 }
 
 
 Handle<Code> KeyedLoadIC::pre_monomorphic_stub(Isolate* isolate) {
   return isolate->builtins()->KeyedLoadIC_PreMonomorphic();
 }
 
 
 Handle<Code> LoadIC::pre_monomorphic_stub() const {
   if (kind() == Code::LOAD_IC) {
     return LoadIC::pre_monomorphic_stub(isolate(), extra_ic_state());
   } else {
     DCHECK_EQ(Code::KEYED_LOAD_IC, kind());
     return KeyedLoadIC::pre_monomorphic_stub(isolate());
   }
 }
 
 
 Handle<Code> LoadIC::SimpleFieldLoad(FieldIndex index) {
   LoadFieldStub stub(isolate(), index);
   return stub.GetCode();
 }
 
 
 void LoadIC::UpdateCaches(LookupIterator* lookup) {
   if (state() == UNINITIALIZED) {
     // This is the first time we execute this inline cache. Set the target to
     // the pre monomorphic stub to delay setting the monomorphic state.
-    set_target(*pre_monomorphic_stub());
+    if (UseVector()) {
+      ConfigureVectorState(PREMONOMORPHIC);
+    } else {
+      set_target(*pre_monomorphic_stub());
+    }
     TRACE_IC("LoadIC", lookup->name());
     return;
   }
 
   Handle<Code> code;
   if (lookup->state() == LookupIterator::JSPROXY ||
       lookup->state() == LookupIterator::ACCESS_CHECK) {
     code = slow_stub();
   } else if (!lookup->IsFound()) {
     if (kind() == Code::LOAD_IC) {
@@ skipping 242 matching lines @@
       }
     }
   } else if (key->IsUndefined()) {
     key = isolate->factory()->undefined_string();
   }
   return key;
 }
 
 
 Handle<Code> KeyedLoadIC::LoadElementStub(Handle<HeapObject> receiver) {
+  Handle<Code> null_handle;
   Handle<Map> receiver_map(receiver->map(), isolate());
   MapHandleList target_receiver_maps;
   TargetMaps(&target_receiver_maps);
 
+
   if (target_receiver_maps.length() == 0) {
+    if (FLAG_vector_ics) {
+      Handle<Code> handler =
+          PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
+      ConfigureVectorState(Handle<Name>::null(), receiver_type(), handler);
+      return null_handle;
+    }
     return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
   }
 
   // The first time a receiver is seen that is a transitioned version of the
   // previous monomorphic receiver type, assume the new ElementsKind is the
   // monomorphic type. This benefits global arrays that only transition
   // once, and all call sites accessing them are faster if they remain
   // monomorphic. If this optimistic assumption is not true, the IC will
   // miss again and it will become polymorphic and support both the
   // untransitioned and transitioned maps.
   if (state() == MONOMORPHIC && !receiver->IsString() &&
       IsMoreGeneralElementsKindTransition(
           target_receiver_maps.at(0)->elements_kind(),
           Handle<JSObject>::cast(receiver)->GetElementsKind())) {
+    if (FLAG_vector_ics) {
+      Handle<Code> handler =
+          PropertyICCompiler::ComputeKeyedLoadMonomorphicHandler(receiver_map);
+      ConfigureVectorState(Handle<Name>::null(), receiver_type(), handler);
+      return null_handle;
+    }
     return PropertyICCompiler::ComputeKeyedLoadMonomorphic(receiver_map);
   }
 
   DCHECK(state() != GENERIC);
 
   // Determine the list of receiver maps that this call site has seen,
   // adding the map that was just encountered.
   if (!AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map)) {
     // If the miss wasn't due to an unseen map, a polymorphic stub
     // won't help, use the generic stub.
     TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "same map added twice");
+    if (FLAG_vector_ics) {
+      ConfigureVectorState(GENERIC);
+      return null_handle;
+    }
     return generic_stub();
   }
 
   // If the maximum number of receiver maps has been exceeded, use the generic
   // version of the IC.
   if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
     TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "max polymorph exceeded");
+    if (FLAG_vector_ics) {
+      ConfigureVectorState(GENERIC);
+      return null_handle;
+    }
     return generic_stub();
   }
 
+  if (FLAG_vector_ics) {
+    CodeHandleList handlers(target_receiver_maps.length());
+    ElementHandlerCompiler compiler(isolate());
+    compiler.CompileElementHandlers(&target_receiver_maps, &handlers);
+    TypeHandleList types(target_receiver_maps.length());
+    for (int i = 0; i < target_receiver_maps.length(); i++) {
+      types.Add(HeapType::Class(target_receiver_maps.at(i), isolate()));
+    }
+    ConfigureVectorState(Handle<Name>::null(), &types, &handlers);
+    return null_handle;
+  }
+
   return PropertyICCompiler::ComputeKeyedLoadPolymorphic(&target_receiver_maps);
 }
 
 
 MaybeHandle<Object> KeyedLoadIC::Load(Handle<Object> object,
                                       Handle<Object> key) {
   if (MigrateDeprecated(object)) {
     Handle<Object> result;
     ASSIGN_RETURN_ON_EXCEPTION(
         isolate(), result, Runtime::GetObjectProperty(isolate(), object, key),
@@ skipping 15 matching lines @@
   } else if (FLAG_use_ic && !object->IsAccessCheckNeeded()) {
     if (object->IsJSObject() || (object->IsString() && key->IsNumber())) {
       Handle<HeapObject> receiver = Handle<HeapObject>::cast(object);
       if (object->IsString() || !Object::ToSmi(isolate(), key).is_null()) {
         stub = LoadElementStub(receiver);
       }
     }
   }
 
   if (!is_target_set()) {
-    Code* generic = *generic_stub();
-    if (*stub == generic) {
-      TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "set generic");
+    if (!FLAG_vector_ics) {
+      Code* generic = *generic_stub();
+      if (*stub == generic) {
+        TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "set generic");
+      }
+
+      set_target(*stub);
     }
-    set_target(*stub);
     TRACE_IC("LoadIC", key);
   }
 
   if (!load_handle.is_null()) return load_handle;
   Handle<Object> result;
   ASSIGN_RETURN_ON_EXCEPTION(isolate(), result,
                              Runtime::GetObjectProperty(isolate(), object, key),
                              Object);
   return result;
 }
@@ skipping 830 matching lines @@
   CallIC ic(isolate, &nexus);
   ic.PatchMegamorphic(function);
   return *function;
 }
 
 
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(LoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
-  ic.UpdateState(receiver, key);
   Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+
+  if (FLAG_vector_ics) {
+    DCHECK(args.length() == 4);
+    Handle<Smi> slot = args.at<Smi>(2);
+    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+    LoadICNexus nexus(vector, vector_slot);
+    LoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  } else {
+    DCHECK(args.length() == 2);
+    LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  }
   return *result;
 }
 
 
 // Used from ic-<arch>.cc
 RUNTIME_FUNCTION(KeyedLoadIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
-  ic.UpdateState(receiver, key);
   Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+
+  if (FLAG_vector_ics) {
+    DCHECK(args.length() == 4);
+    Handle<Smi> slot = args.at<Smi>(2);
+    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+    KeyedLoadICNexus nexus(vector, vector_slot);
+    KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  } else {
+    DCHECK(args.length() == 2);
+    KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  }
+
   return *result;
 }
 
 
 RUNTIME_FUNCTION(KeyedLoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Object> key = args.at<Object>(1);
-  ic.UpdateState(receiver, key);
   Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+
+  if (FLAG_vector_ics) {
+    DCHECK(args.length() == 4);
+    Handle<Smi> slot = args.at<Smi>(2);
+    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+    KeyedLoadICNexus nexus(vector, vector_slot);
+    KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  } else {
+    DCHECK(args.length() == 2);
+    KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  }
+
   return *result;
 }
 
 
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(StoreIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
   DCHECK(args.length() == 3);
   StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
@@ skipping 471 matching lines @@
   }
 
   return isolate->heap()->no_interceptor_result_sentinel();
 }
 
 
 static Object* ThrowReferenceError(Isolate* isolate, Name* name) {
   // If the load is non-contextual, just return the undefined result.
   // Note that both keyed and non-keyed loads may end up here.
   HandleScope scope(isolate);
-  LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
+  LoadIC ic(IC::NO_EXTRA_FRAME, isolate, true);
   if (ic.contextual_mode() != CONTEXTUAL) {
     return isolate->heap()->undefined_value();
   }
 
   // Throw a reference error.
   Handle<Name> name_handle(name);
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewReferenceError("not_defined", HandleVector(&name_handle, 1)));
 }
 
@@ skipping 61 matching lines @@
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
       isolate, result,
       JSObject::GetElementWithInterceptor(receiver, receiver, index));
   return *result;
 }
 
 
 RUNTIME_FUNCTION(LoadIC_MissFromStubFailure) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 2);
-  LoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
   Handle<Object> receiver = args.at<Object>(0);
   Handle<Name> key = args.at<Name>(1);
-  ic.UpdateState(receiver, key);
   Handle<Object> result;
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+
+  if (FLAG_vector_ics) {
+    DCHECK(args.length() == 4);
+    Handle<Smi> slot = args.at<Smi>(2);
+    Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(3);
+    FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
+    LoadICNexus nexus(vector, vector_slot);
+    LoadIC ic(IC::EXTRA_CALL_FRAME, isolate, &nexus);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  } else {
+    DCHECK(args.length() == 2);
+    LoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
+    ic.UpdateState(receiver, key);
+    ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, result, ic.Load(receiver, key));
+  }
+
   return *result;
 }
 
 
 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