Add an IC for CompareNil operations

src/objects.cc

 // Copyright 2013 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 9111 matching lines @@
   int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
   for (RelocIterator it(this, mask); !it.done(); it.next()) {
     RelocInfo* info = it.rinfo();
     Object* object = info->target_object();
     if (object->IsMap()) return Map::cast(object);
   }
   return NULL;
 }
 
 
+void Code::ReplaceFirstMap(Map* replace_with) {
+  ASSERT(is_inline_cache_stub());
+  AssertNoAllocation no_allocation;
+  int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
+  for (RelocIterator it(this, mask); !it.done(); it.next()) {
+    RelocInfo* info = it.rinfo();
+    Object* object = info->target_object();
+    if (object->IsMap()) {
+      info->set_target_object(replace_with);
+      return;
+    }
+  }
+  UNREACHABLE();
+}
+
+
 void Code::FindAllMaps(MapHandleList* maps) {
   ASSERT(is_inline_cache_stub());
   AssertNoAllocation no_allocation;
   int mask = RelocInfo::ModeMask(RelocInfo::EMBEDDED_OBJECT);
   for (RelocIterator it(this, mask); !it.done(); it.next()) {
     RelocInfo* info = it.rinfo();
     Object* object = info->target_object();
     if (object->IsMap()) maps->Add(Handle<Map>(Map::cast(object)));
   }
 }
@@ skipping 175 matching lines @@
     case BUILTIN: return "BUILTIN";
     case LOAD_IC: return "LOAD_IC";
     case KEYED_LOAD_IC: return "KEYED_LOAD_IC";
     case STORE_IC: return "STORE_IC";
     case KEYED_STORE_IC: return "KEYED_STORE_IC";
     case CALL_IC: return "CALL_IC";
     case KEYED_CALL_IC: return "KEYED_CALL_IC";
     case UNARY_OP_IC: return "UNARY_OP_IC";
     case BINARY_OP_IC: return "BINARY_OP_IC";
     case COMPARE_IC: return "COMPARE_IC";
+    case COMPARE_NIL_IC: return "COMPARE_NIL_IC";
     case TO_BOOLEAN_IC: return "TO_BOOLEAN_IC";
   }
   UNREACHABLE();
   return NULL;
 }
 
 
 #ifdef ENABLE_DISASSEMBLER
 
 void DeoptimizationInputData::DeoptimizationInputDataPrint(FILE* out) {
@@ skipping 5141 matching lines @@
   set_year(Smi::FromInt(year), SKIP_WRITE_BARRIER);
   set_month(Smi::FromInt(month), SKIP_WRITE_BARRIER);
   set_day(Smi::FromInt(day), SKIP_WRITE_BARRIER);
   set_weekday(Smi::FromInt(weekday), SKIP_WRITE_BARRIER);
   set_hour(Smi::FromInt(hour), SKIP_WRITE_BARRIER);
   set_min(Smi::FromInt(min), SKIP_WRITE_BARRIER);
   set_sec(Smi::FromInt(sec), SKIP_WRITE_BARRIER);
 }
 
 } }  // namespace v8::internal