harmony-scoping: Implement LoadIC handler for loads from global contexts.

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 652 matching lines @@
 
   if (FLAG_harmony_scoping && object->IsGlobalObject() && name->IsString()) {
     // Look up in global context table.
     Handle<String> str_name = Handle<String>::cast(name);
     Handle<GlobalObject> global = Handle<GlobalObject>::cast(object);
     Handle<GlobalContextTable> global_contexts(
         global->native_context()->global_context_table());
 
     GlobalContextTable::LookupResult lookup_result;
     if (GlobalContextTable::Lookup(global_contexts, str_name, &lookup_result)) {
+      if (use_ic && LoadGlobalContextFieldStub::Accepted(&lookup_result)) {
+        LoadGlobalContextFieldStub stub(isolate(), &lookup_result);
+        PatchCache(name, stub.GetCode());
+      }
       return FixedArray::get(GlobalContextTable::GetContext(
                                  global_contexts, lookup_result.context_index),
                              lookup_result.slot_index);
     }
   }
 
   // Named lookup in the object.
   LookupIterator it(object, name);
   LookupForRead(&it);
 
@@ skipping 2087 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