Track representations of fields

src/stub-cache.cc

 // Copyright 2012 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 403 matching lines @@
 }
 
 
 Handle<Code> StubCache::ComputeStoreTransition(Handle<Name> name,
                                                Handle<JSObject> receiver,
                                                LookupResult* lookup,
                                                Handle<Map> transition,
                                                StrictModeFlag strict_mode) {
   Handle<Code> stub = FindIC(
       name, receiver, Code::STORE_IC, Code::MAP_TRANSITION, strict_mode);
-  if (!stub.is_null()) return stub;
+  if (!stub.is_null()) {
+    MapHandleList embedded_maps;
+    stub->FindAllMaps(&embedded_maps);
+    for (int i = 0; i < embedded_maps.length(); i++) {
+      if (embedded_maps.at(i).is_identical_to(transition)) {
+        return stub;
+      }
+    }
+  }
 
   StoreStubCompiler compiler(isolate_, strict_mode);
   Handle<Code> code =
       compiler.CompileStoreTransition(receiver, lookup, transition, name);
   JSObject::UpdateMapCodeCache(receiver, name, code);
   return code;
 }
 
 
 Handle<Code> StubCache::ComputeKeyedLoadElement(Handle<Map> receiver_map) {
@@ skipping 128 matching lines @@
 
 
 Handle<Code> StubCache::ComputeKeyedStoreTransition(
     Handle<Name> name,
     Handle<JSObject> receiver,
     LookupResult* lookup,
     Handle<Map> transition,
     StrictModeFlag strict_mode) {
   Handle<Code> stub = FindIC(
       name, receiver, Code::KEYED_STORE_IC, Code::MAP_TRANSITION, strict_mode);
-  if (!stub.is_null()) return stub;
+  if (!stub.is_null()) {
+    MapHandleList embedded_maps;
+    stub->FindAllMaps(&embedded_maps);
+    for (int i = 0; i < embedded_maps.length(); i++) {
+      if (embedded_maps.at(i).is_identical_to(transition)) {
+        return stub;
+      }
+    }
+  }
 
   KeyedStoreStubCompiler compiler(isolate(), strict_mode, STANDARD_STORE);
   Handle<Code> code =
       compiler.CompileStoreTransition(receiver, lookup, transition, name);
   JSObject::UpdateMapCodeCache(receiver, name, code);
   return code;
 }
 
 
 #define CALL_LOGGER_TAG(kind, type) \
@@ skipping 326 matching lines @@
 
   isolate()->counters()->keyed_load_polymorphic_stubs()->Increment();
 
   PolymorphicCodeCache::Update(cache, receiver_maps, flags, code);
   return code;
 }
 
 
 Handle<Code> StubCache::ComputePolymorphicIC(MapHandleList* receiver_maps,
                                              CodeHandleList* handlers,
+                                             int number_of_valid_maps,
                                              Handle<Name> name) {
   LoadStubCompiler ic_compiler(isolate_);
-  Code::StubType type = handlers->length() == 1 ? handlers->at(0)->type()
-                                                : Code::NORMAL;
+  Code::StubType type = number_of_valid_maps == 1 ? handlers->at(0)->type()
+                                                  : Code::NORMAL;
   Handle<Code> ic = ic_compiler.CompilePolymorphicIC(
       receiver_maps, handlers, name, type, PROPERTY);
   return ic;
 }
 
 
 Handle<Code> StubCache::ComputeStoreElementPolymorphic(
     MapHandleList* receiver_maps,
     KeyedAccessStoreMode store_mode,
     StrictModeFlag strict_mode) {
@@ skipping 1128 matching lines @@
           Handle<FunctionTemplateInfo>(
               FunctionTemplateInfo::cast(signature->receiver()));
     }
   }
 
   is_simple_api_call_ = true;
 }
 
 
 } }  // namespace v8::internal