Simplify the LookupIterator

src/ic/handler-compiler.cc

 // Copyright 2014 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/ic/call-optimization.h"
 #include "src/ic/handler-compiler.h"
 #include "src/ic/ic-inl.h"
 
@@ skipping 210 matching lines @@
 
 
 Handle<Code> NamedLoadHandlerCompiler::CompileLoadInterceptor(
     LookupIterator* it) {
   // So far the most popular follow ups for interceptor loads are FIELD and
   // ExecutableAccessorInfo, so inline only them. Other cases may be added
   // later.
   bool inline_followup = false;
   switch (it->state()) {
     case LookupIterator::TRANSITION:
-    case LookupIterator::UNKNOWN:
       UNREACHABLE();
     case LookupIterator::ACCESS_CHECK:
     case LookupIterator::INTERCEPTOR:
     case LookupIterator::JSPROXY:
     case LookupIterator::NOT_FOUND:
       break;
     case LookupIterator::DATA:
       inline_followup = it->property_details().type() == FIELD;
       break;
     case LookupIterator::ACCESSOR: {
@@ skipping 27 matching lines @@
   set_type_for_object(holder());
   set_holder(real_named_property_holder);
   Register reg = Frontend(interceptor_reg, it->name());
 
   switch (it->state()) {
     case LookupIterator::ACCESS_CHECK:
     case LookupIterator::INTERCEPTOR:
     case LookupIterator::JSPROXY:
     case LookupIterator::NOT_FOUND:
     case LookupIterator::TRANSITION:
-    case LookupIterator::UNKNOWN:
       UNREACHABLE();
     case LookupIterator::DATA: {
       DCHECK_EQ(FIELD, it->property_details().type());
       __ Move(receiver(), reg);
       LoadFieldStub stub(isolate(), it->GetFieldIndex());
       GenerateTailCall(masm(), stub.GetCode());
       break;
     }
     case LookupIterator::ACCESSOR:
       Handle<ExecutableAccessorInfo> info =
@@ skipping 106 matching lines @@
         DCHECK(elements_kind == DICTIONARY_ELEMENTS);
         cached_stub = LoadDictionaryElementStub(isolate()).GetCode();
       }
     }
 
     handlers->Add(cached_stub);
   }
 }
 }
 }  // namespace v8::internal