Use weak cells to embed maps in store handler.

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.h"
 #include "src/ic/ic-inl.h"
@@ skipping 294 matching lines @@
   GenerateLoadViaGetter(masm(), type(), receiver(), getter);
   return GetCode(kind(), Code::FAST, name);
 }
 
 
 // TODO(verwaest): Cleanup. holder() is actually the receiver.
 Handle<Code> NamedStoreHandlerCompiler::CompileStoreTransition(
     Handle<Map> transition, Handle<Name> name) {
   Label miss;
 
-  // Ensure no transitions to deprecated maps are followed.
-  __ CheckMapDeprecated(transition, scratch1(), &miss);
-
   // Check that we are allowed to write this.
   bool is_nonexistent = holder()->map() == transition->GetBackPointer();
   if (is_nonexistent) {
     // Find the top object.
     Handle<JSObject> last;
     PrototypeIterator iter(isolate(), holder());
     while (!iter.IsAtEnd()) {
       last = Handle<JSObject>::cast(PrototypeIterator::GetCurrent(iter));
       iter.Advance();
     }
@@ skipping 10 matching lines @@
   Representation representation = details.representation();
   DCHECK(!representation.IsNone());
 
   // Stub is never generated for objects that require access checks.
   DCHECK(!transition->is_access_check_needed());
 
   // Call to respective StoreTransitionStub.
   if (details.type() == CONSTANT) {
     GenerateConstantCheck(descriptors->GetValue(descriptor), value(), &miss);
 
-    GenerateRestoreNameAndMap(name, transition);
+    GenerateRestoreMap(transition, scratch2(), &miss);
+    GenerateRestoreName(name);
     StoreTransitionStub stub(isolate());
     GenerateTailCall(masm(), stub.GetCode());
 
   } else {
     if (representation.IsHeapObject()) {
       GenerateFieldTypeChecks(descriptors->GetFieldType(descriptor), value(),
                               &miss);
     }
     StoreTransitionStub::StoreMode store_mode =
         Map::cast(transition->GetBackPointer())->unused_property_fields() == 0
             ? StoreTransitionStub::ExtendStorageAndStoreMapAndValue
             : StoreTransitionStub::StoreMapAndValue;
 
-    GenerateRestoreNameAndMap(name, transition);
+    GenerateRestoreMap(transition, scratch2(), &miss);
+    GenerateRestoreName(name);
     StoreTransitionStub stub(isolate(),
                              FieldIndex::ForDescriptor(*transition, descriptor),
                              representation, store_mode);
     GenerateTailCall(masm(), stub.GetCode());
   }
 
   GenerateRestoreName(&miss, name);
   TailCallBuiltin(masm(), MissBuiltin(kind()));
 
   return GetCode(kind(), Code::FAST, name);
@@ skipping 63 matching lines @@
         DCHECK(elements_kind == DICTIONARY_ELEMENTS);
         cached_stub = LoadDictionaryElementStub(isolate()).GetCode();
       }
     }
 
     handlers->Add(cached_stub);
   }
 }
 }
 }  // namespace v8::internal