Last cross-platform cleanup in preparation of improved ARM code for indexed

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 36576)
+++ runtime/vm/object.cc	(working copy)
@@ -13054,6 +13054,50 @@
 }
 
 
+intptr_t Instance::ElementSizeFor(intptr_t cid) {
+  if (RawObject::IsExternalTypedDataClassId(cid)) {
+    return ExternalTypedData::ElementSizeInBytes(cid);
+  } else if (RawObject::IsTypedDataClassId(cid)) {
+    return TypedData::ElementSizeInBytes(cid);
+  }
+  switch (cid) {
+    case kArrayCid:
+    case kImmutableArrayCid:
+      return Array::kBytesPerElement;
+    case kOneByteStringCid:
+      return OneByteString::kBytesPerElement;
+    case kTwoByteStringCid:
+      return TwoByteString::kBytesPerElement;
+    default:
+      UNIMPLEMENTED();
+      return 0;
+  }
+}
+
+
+intptr_t Instance::DataOffsetFor(intptr_t cid) {
+  if (RawObject::IsExternalTypedDataClassId(cid)) {
+    // Elements start at offset 0 of the external data.
+    return 0;
+  }
+  if (RawObject::IsTypedDataClassId(cid)) {
+    return TypedData::data_offset();
+  }
+  switch (cid) {
+    case kArrayCid:
+    case kImmutableArrayCid:
+      return Array::data_offset();
+    case kOneByteStringCid:
+      return OneByteString::data_offset();
+    case kTwoByteStringCid:
+      return TwoByteString::data_offset();
+    default:
+      UNIMPLEMENTED();
+      return Array::data_offset();
+  }
+}
+
+
 const char* Instance::ToCString() const {
   if (IsNull()) {
     return "null";