[ic] Support data handlers that represent transitioning stores.

src/ic/handler-configuration-inl.h

 // Copyright 2016 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.
 
 #ifndef V8_IC_HANDLER_CONFIGURATION_INL_H_
 #define V8_IC_HANDLER_CONFIGURATION_INL_H_
 
 #include "src/ic/handler-configuration.h"
 
 #include "src/field-index-inl.h"
@@ skipping 41 matching lines @@
                                         ElementsKind elements_kind,
                                         bool convert_hole_to_undefined,
                                         bool is_js_array) {
   int config = KindBits::encode(kForElements) |
                ElementsKindBits::encode(elements_kind) |
                ConvertHoleBits::encode(convert_hole_to_undefined) |
                IsJsArrayBits::encode(is_js_array);
   return handle(Smi::FromInt(config), isolate);
 }
 
-Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
-                                        FieldIndex field_index,
-                                        Representation representation) {
+Handle<Object> StoreHandler::StoreField(Isolate* isolate, Kind kind,
+                                        int descriptor, FieldIndex field_index,
+                                        Representation representation,
+                                        bool extend_storage) {
   StoreHandler::FieldRepresentation field_rep;
   switch (representation.kind()) {
     case Representation::kSmi:
       field_rep = StoreHandler::kSmi;
       break;
     case Representation::kDouble:
       field_rep = StoreHandler::kDouble;
       break;
     case Representation::kHeapObject:
       field_rep = StoreHandler::kHeapObject;
       break;
     case Representation::kTagged:
       field_rep = StoreHandler::kTagged;
       break;
     default:
       UNREACHABLE();
       return Handle<Object>::null();
   }
   int value_index = DescriptorArray::ToValueIndex(descriptor);
 
-  int config = StoreHandler::KindBits::encode(StoreHandler::kForFields) |
+  DCHECK(kind == kStoreField || kind == kTransitionToField);
+  DCHECK_IMPLIES(kind == kStoreField, !extend_storage);
+
+  int config = StoreHandler::KindBits::encode(kind) |
+               StoreHandler::ExtendStorageBits::encode(extend_storage) |
                StoreHandler::IsInobjectBits::encode(field_index.is_inobject()) |
                StoreHandler::FieldRepresentationBits::encode(field_rep) |
                StoreHandler::DescriptorValueIndexBits::encode(value_index) |
                StoreHandler::FieldOffsetBits::encode(field_index.offset());
   return handle(Smi::FromInt(config), isolate);
 }
 
+Handle<Object> StoreHandler::StoreField(Isolate* isolate, int descriptor,
+                                        FieldIndex field_index,
+                                        Representation representation) {
+  return StoreField(isolate, kStoreField, descriptor, field_index,
+                    representation, false);
+}
+
+Handle<Object> StoreHandler::TransitionToField(Isolate* isolate, int descriptor,
+                                               FieldIndex field_index,
+                                               Representation representation,
+                                               bool extend_storage) {
+  return StoreField(isolate, kTransitionToField, descriptor, field_index,
+                    representation, extend_storage);
+}
+
+Handle<Object> StoreHandler::TransitionToConstant(Isolate* isolate,
+                                                  int descriptor) {
+  int value_index = DescriptorArray::ToValueIndex(descriptor);
+  int config =
+      StoreHandler::KindBits::encode(StoreHandler::kTransitionToConstant) |
+      StoreHandler::DescriptorValueIndexBits::encode(value_index);
+  return handle(Smi::FromInt(config), isolate);
+}
+
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_HANDLER_CONFIGURATION_INL_H_