Change the type of the cache so we can check whether it is there

src/objects.cc

 // Copyright 2013 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/allocation-site-scopes.h"
 #include "src/api.h"
 #include "src/arguments.h"
@@ skipping 4423 matching lines @@
 
 Handle<NormalizedMapCache> NormalizedMapCache::New(Isolate* isolate) {
   Handle<FixedArray> array(
       isolate->factory()->NewFixedArray(kEntries, TENURED));
   return Handle<NormalizedMapCache>::cast(array);
 }
 
 
 MaybeHandle<Map> NormalizedMapCache::Get(Handle<Map> fast_map,
                                          PropertyNormalizationMode mode) {
-  // Only use the cache once it is initialized.
-  if (!IsNormalizedMapCache(this)) return MaybeHandle<Map>();
   DisallowHeapAllocation no_gc;
   Object* value = FixedArray::get(GetIndex(fast_map));
   if (!value->IsMap() ||
       !Map::cast(value)->EquivalentToForNormalization(*fast_map, mode)) {
     return MaybeHandle<Map>();
   }
   return handle(Map::cast(value));
 }
 
 
 void NormalizedMapCache::Set(Handle<Map> fast_map,
                              Handle<Map> normalized_map) {
-  // Only use the cache once it is initialized.
-  if (!IsNormalizedMapCache(this)) return;
   DisallowHeapAllocation no_gc;
   DCHECK(normalized_map->is_dictionary_map());
   FixedArray::set(GetIndex(fast_map), *normalized_map);
 }
 
 
 void NormalizedMapCache::Clear() {
   int entries = length();
   for (int i = 0; i != entries; i++) {
     set_undefined(i);
@@ skipping 2503 matching lines @@
   result->set_bit_field3(new_bit_field3);
   return result;
 }
 
 
 Handle<Map> Map::Normalize(Handle<Map> fast_map,
                            PropertyNormalizationMode mode) {
   DCHECK(!fast_map->is_dictionary_map());
 
   Isolate* isolate = fast_map->GetIsolate();
-  Handle<NormalizedMapCache> cache(
-      isolate->context()->native_context()->normalized_map_cache());
+  Handle<Object> maybe_cache(isolate->native_context()->normalized_map_cache(),
+                             isolate);
+  bool use_cache = !maybe_cache->IsUndefined();
+  Handle<NormalizedMapCache> cache;
+  if (use_cache) cache = Handle<NormalizedMapCache>::cast(maybe_cache);
 
   Handle<Map> new_map;
-  if (cache->Get(fast_map, mode).ToHandle(&new_map)) {
+  if (use_cache && cache->Get(fast_map, mode).ToHandle(&new_map)) {
 #ifdef VERIFY_HEAP
     if (FLAG_verify_heap) new_map->DictionaryMapVerify();
 #endif
 #ifdef ENABLE_SLOW_DCHECKS
     if (FLAG_enable_slow_asserts) {
       // The cached map should match newly created normalized map bit-by-bit,
       // except for the code cache, which can contain some ics which can be
       // applied to the shared map.
       Handle<Map> fresh = Map::CopyNormalized(fast_map, mode);
 
       DCHECK(memcmp(fresh->address(),
                     new_map->address(),
                     Map::kCodeCacheOffset) == 0);
       STATIC_ASSERT(Map::kDependentCodeOffset ==
                     Map::kCodeCacheOffset + kPointerSize);
       int offset = Map::kDependentCodeOffset + kPointerSize;
       DCHECK(memcmp(fresh->address() + offset,
                     new_map->address() + offset,
                     Map::kSize - offset) == 0);
     }
 #endif
   } else {
     new_map = Map::CopyNormalized(fast_map, mode);
-    cache->Set(fast_map, new_map);
-    isolate->counters()->normalized_maps()->Increment();
+    if (use_cache) {
+      cache->Set(fast_map, new_map);
+      isolate->counters()->normalized_maps()->Increment();
+    }
   }
   fast_map->NotifyLeafMapLayoutChange();
   return new_map;
 }
 
 
 Handle<Map> Map::CopyNormalized(Handle<Map> map,
                                 PropertyNormalizationMode mode) {
   int new_instance_size = map->instance_size();
   if (mode == CLEAR_INOBJECT_PROPERTIES) {
@@ skipping 9896 matching lines @@
 #define ERROR_MESSAGES_TEXTS(C, T) T,
   static const char* error_messages_[] = {
       ERROR_MESSAGES_LIST(ERROR_MESSAGES_TEXTS)
   };
 #undef ERROR_MESSAGES_TEXTS
   return error_messages_[reason];
 }
 
 
 } }  // namespace v8::internal