CallIC MISS handler doesn't need receiver.

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 2120 matching lines @@
     TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "slow stub");
   }
   DCHECK(!stub.is_null());
   set_target(*stub);
   TRACE_IC("StoreIC", key);
 
   return store_handle;
 }
 
 
-bool CallIC::DoCustomHandler(Handle<Object> receiver, Handle<Object> function,
+bool CallIC::DoCustomHandler(Handle<Object> function,
                              const CallICState& callic_state) {
   DCHECK(FLAG_use_ic && function->IsJSFunction());
 
   // Are we the array function?
   Handle<JSFunction> array_function =
       Handle<JSFunction>(isolate()->native_context()->array_function());
   if (array_function.is_identical_to(Handle<JSFunction>::cast(function))) {
     // Alter the slot.
     CallICNexus* nexus = casted_nexus<CallICNexus>();
     nexus->ConfigureMonomorphicArray();
@@ skipping 44 matching lines @@
     Handle<JSFunction> js_function = Handle<JSFunction>::cast(function);
     name = handle(js_function->shared()->name(), isolate());
   }
 
   TRACE_IC("CallIC", name);
   OnTypeFeedbackChanged(isolate(), get_host(), nexus->vector(), state(),
                         GENERIC);
 }
 
 
-void CallIC::HandleMiss(Handle<Object> receiver, Handle<Object> function) {
+void CallIC::HandleMiss(Handle<Object> function) {
   CallICState callic_state(target()->extra_ic_state());
   Handle<Object> name = isolate()->factory()->empty_string();
   CallICNexus* nexus = casted_nexus<CallICNexus>();
   Object* feedback = nexus->GetFeedback();
 
   // Hand-coded MISS handling is easier if CallIC slots don't contain smis.
   DCHECK(!feedback->IsSmi());
 
   if (feedback->IsWeakCell() || !function->IsJSFunction()) {
     // We are going generic.
     nexus->ConfigureGeneric();
   } else {
     // The feedback is either uninitialized or an allocation site.
     // It might be an allocation site because if we re-compile the full code
     // to add deoptimization support, we call with the default call-ic, and
     // merely need to patch the target to match the feedback.
     // TODO(mvstanton): the better approach is to dispense with patching
     // altogether, which is in progress.
     DCHECK(feedback == *TypeFeedbackVector::UninitializedSentinel(isolate()) ||
            feedback->IsAllocationSite());
 
     // Do we want to install a custom handler?
-    if (FLAG_use_ic && DoCustomHandler(receiver, function, callic_state)) {
+    if (FLAG_use_ic && DoCustomHandler(function, callic_state)) {
       return;
     }
 
     nexus->ConfigureMonomorphic(Handle<JSFunction>::cast(function));
   }
 
   if (function->IsJSFunction()) {
     Handle<JSFunction> js_function = Handle<JSFunction>::cast(function);
     name = handle(js_function->shared()->name(), isolate());
   }
 
   IC::State new_state = nexus->StateFromFeedback();
   OnTypeFeedbackChanged(isolate(), get_host(), *vector(), state(), new_state);
   TRACE_IC("CallIC", name);
 }
 
 
 #undef TRACE_IC
 
 
 // ----------------------------------------------------------------------------
 // Static IC stub generators.
 //
 
 // Used from ic-<arch>.cc.
 RUNTIME_FUNCTION(CallIC_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 4);
-  Handle<Object> receiver = args.at<Object>(0);
-  Handle<Object> function = args.at<Object>(1);
-  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
-  Handle<Smi> slot = args.at<Smi>(3);
+  DCHECK(args.length() == 3);
+  Handle<Object> function = args.at<Object>(0);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(1);
+  Handle<Smi> slot = args.at<Smi>(2);
   FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
   CallICNexus nexus(vector, vector_slot);
   CallIC ic(isolate, &nexus);
-  ic.HandleMiss(receiver, function);
+  ic.HandleMiss(function);
   return *function;
 }
 
 
 RUNTIME_FUNCTION(CallIC_Customization_Miss) {
   TimerEventScope<TimerEventIcMiss> timer(isolate);
   HandleScope scope(isolate);
-  DCHECK(args.length() == 4);
-  Handle<Object> function = args.at<Object>(1);
-  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(2);
-  Handle<Smi> slot = args.at<Smi>(3);
+  DCHECK(args.length() == 3);
+  Handle<Object> function = args.at<Object>(0);
+  Handle<TypeFeedbackVector> vector = args.at<TypeFeedbackVector>(1);
+  Handle<Smi> slot = args.at<Smi>(2);
   FeedbackVectorICSlot vector_slot = vector->ToICSlot(slot->value());
   CallICNexus nexus(vector, vector_slot);
   // A miss on a custom call ic always results in going megamorphic.
   CallIC ic(isolate, &nexus);
   ic.PatchMegamorphic(function);
   return *function;
 }
 
 
 // Used from ic-<arch>.cc.
@@ skipping 701 matching lines @@
 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