[ic] Support data handlers that represent simple field 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 22 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) {
+  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) |
+               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);
+}
+
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_IC_HANDLER_CONFIGURATION_INL_H_