[lworld] [Rev 01] RFR: 8244810: [lworld] Decommission arrayStorageProperties from Klass:array_klass() et el

[Frederic Parain]

> On May 13, 2020, at 12:23, Frederic Parain <fparain at openjdk.java.net> wrote:
> 
> On Wed, 13 May 2020 09:54:31 GMT, David Simms <dsimms at openjdk.org> wrote:
> 
>>> First part of LW2 to LW3 arrays
>> 
>> David Simms has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>  Copyright syntax
> 
> Looks like a good start to remove `ArrayStorageProperties`.
> My only strong concern is in `oopFactory.cpp` (see inline comment).
> 
> Fred
> 
> src/hotspot/share/memory/oopFactory.cpp line 155:
> 
>> 154:   ValueArrayKlass* vak = ValueArrayKlass::cast(array->klass());
>> 155:   objArrayHandle oarray = new_objArray_handle(vak->element_klass()->super(),
>> 156:                                               array->length(), CHECK_(objArrayHandle()));
> 
> With the evolving model, it is not guaranteed that the direct super type will be an inline type, it might be safer to
> create an `Object[]` instead.

Correction:
"With the evolving model, it is not guaranteed that the direct super type will *not* be an inline type, it might be safer
to create an `Object[]` instead.”

Fred

> 
> src/hotspot/share/oops/arrayStorageProperties.hpp line 2:
> 
>> 1: /*
>> 2:  * Copyright (c) 2019, 2020, Oracle and/or its affiliates. All rights reserved.
>> 3:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
> 
> (Comment for the whole file)
> I understand this is the first stage of a set of complex changes to remove the `ArrayStorageProperties` code, but
> cleaning up the `ArrayStorageProperties` as things are getting removed might help to see progress (and would make
> reviews easier). For instance:
>  - `clear_flattened()`
>  - `set_flattened()`
>  - `set_null_free()`
>  - `for_signature(Symbol* sig)`
> seem to not be used anymore and could be removed.
> 
> -------------
> 
> PR: https://git.openjdk.java.net/valhalla/pull/44