Adding GetMoreGeneralElementsKind in elements-kind.h

BUG=

Review URL: https://codereview.chromium.org/1307743011

Cr-Commit-Position: refs/heads/master@{#30614}

src/builtins.cc

@@ -650,9 +650,7 @@ BUILTIN(ArrayConcat) {
       ElementsKind arg_kind = JSArray::cast(arg)->map()->elements_kind();
       has_double = has_double || IsFastDoubleElementsKind(arg_kind);
       is_holey = is_holey || IsFastHoleyElementsKind(arg_kind);
-      if (IsMoreGeneralElementsKindTransition(elements_kind, arg_kind)) {
-        elements_kind = arg_kind;
-      }
+      elements_kind = GetMoreGeneralElementsKind(elements_kind, arg_kind);
     }
     if (is_holey) elements_kind = GetHoleyElementsKind(elements_kind);
   }

src/elements-kind.h

@@ -211,6 +211,15 @@ bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
                                          ElementsKind to_kind);
 
 
+inline ElementsKind GetMoreGeneralElementsKind(ElementsKind from_kind,
+                                               ElementsKind to_kind) {
+  if (IsMoreGeneralElementsKindTransition(from_kind, to_kind)) {
+    return to_kind;
+  }
+  return from_kind;
+}
+
+
 inline bool IsTransitionableFastElementsKind(ElementsKind from_kind) {
   return IsFastElementsKind(from_kind) &&
       from_kind != TERMINAL_FAST_ELEMENTS_KIND;

src/ic/ic.cc

@@ -275,11 +275,8 @@ bool IC::TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
     if (first_map == NULL) return false;
     Handle<Map> old_map(first_map);
     if (old_map->is_deprecated()) return true;
-    if (IsMoreGeneralElementsKindTransition(old_map->elements_kind(),
-                                            receiver_map()->elements_kind())) {
-      return true;
-    }
-    return false;
+    return IsMoreGeneralElementsKindTransition(old_map->elements_kind(),
+                                               receiver_map()->elements_kind());
   }
 
   CacheHolderFlag flag;

src/lookup.cc

@@ -134,7 +134,7 @@ void LookupIterator::PrepareForDataProperty(Handle<Object> value) {
     ElementsKind kind = holder_map_->elements_kind();
     ElementsKind to = value->OptimalElementsKind();
     if (IsHoleyElementsKind(kind)) to = GetHoleyElementsKind(to);
-    to = IsMoreGeneralElementsKindTransition(kind, to) ? to : kind;
+    to = GetMoreGeneralElementsKind(kind, to);
     JSObject::TransitionElementsKind(holder, to);
     holder_map_ = handle(holder->map(), isolate_);
 

src/objects.cc

@@ -4190,9 +4190,8 @@ void JSObject::AllocateStorageForMap(Handle<JSObject> object, Handle<Map> map) {
   ElementsKind obj_kind = object->map()->elements_kind();
   ElementsKind map_kind = map->elements_kind();
   if (map_kind != obj_kind) {
-    ElementsKind to_kind = map_kind;
-    if (IsMoreGeneralElementsKindTransition(map_kind, obj_kind) ||
-        IsDictionaryElementsKind(obj_kind)) {
+    ElementsKind to_kind = GetMoreGeneralElementsKind(map_kind, obj_kind);
+    if (IsDictionaryElementsKind(obj_kind)) {
       to_kind = obj_kind;
     }
     if (IsDictionaryElementsKind(to_kind)) {
@@ -12608,7 +12607,7 @@ MaybeHandle<Object> JSObject::AddDataElement(Handle<JSObject> object,
     to = GetHoleyElementsKind(to);
     kind = GetHoleyElementsKind(kind);
   }
-  to = IsMoreGeneralElementsKindTransition(kind, to) ? to : kind;
+  to = GetMoreGeneralElementsKind(kind, to);
   ElementsAccessor* accessor = ElementsAccessor::ForKind(to);
   accessor->Add(object, index, value, attributes, new_capacity);
 

src/runtime/runtime-array.cc

@@ -730,21 +730,16 @@ RUNTIME_FUNCTION(Runtime_ArrayConcat) {
       Handle<JSArray> array(Handle<JSArray>::cast(obj));
       length_estimate = static_cast<uint32_t>(array->length()->Number());
       if (length_estimate != 0) {
-        ElementsKind array_kind =
-            GetPackedElementsKind(array->map()->elements_kind());
-        if (IsMoreGeneralElementsKindTransition(kind, array_kind)) {
-          kind = array_kind;
-        }
+        kind = GetMoreGeneralElementsKind(
+            kind, GetPackedElementsKind(array->map()->elements_kind()));
       }
       element_estimate = EstimateElementCount(array);
     } else {
       if (obj->IsHeapObject()) {
         if (obj->IsNumber()) {
-          if (IsMoreGeneralElementsKindTransition(kind, FAST_DOUBLE_ELEMENTS)) {
-            kind = FAST_DOUBLE_ELEMENTS;
-          }
-        } else if (IsMoreGeneralElementsKindTransition(kind, FAST_ELEMENTS)) {
-          kind = FAST_ELEMENTS;
+          kind = GetMoreGeneralElementsKind(kind, FAST_DOUBLE_ELEMENTS);
+        } else {
+          kind = GetMoreGeneralElementsKind(kind, FAST_ELEMENTS);
         }
       }
       length_estimate = 1;

src/runtime/runtime-literals.cc

@@ -424,10 +424,8 @@ RUNTIME_FUNCTION(Runtime_StoreArrayLiteralElement) {
                                            ? FAST_HOLEY_ELEMENTS
                                            : FAST_ELEMENTS;
       JSObject::TransitionElementsKind(object, transitioned_kind);
-      ElementsKind boilerplate_elements_kind =
-          boilerplate_object->GetElementsKind();
-      if (IsMoreGeneralElementsKindTransition(boilerplate_elements_kind,
-                                              transitioned_kind)) {
+      if (IsMoreGeneralElementsKindTransition(
+              boilerplate_object->GetElementsKind(), transitioned_kind)) {
         JSObject::TransitionElementsKind(boilerplate_object, transitioned_kind);
       }
     }