RFR: 8291065: Creating a VarHandle for a static field triggers class initialization

[Maurizio Cimadamore]

On Fri, 5 May 2023 13:03:14 GMT, Chen Liang <liach at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/invoke/IndirectVarHandle.java line 74:
>> 
>>> 72:     @Override
>>> 73:     public boolean isAccessModeSupported(AccessMode accessMode) {
>>> 74:         var directTarget = this.directTarget;
>> 
>> Why is this not defined in the superclass, and then use `asDirect` (as done in other cases) ?
>
> I aim to avoid eager evaluation of directTarget (which is lazy in LazyStaticVarHandle, computing it requires initializing the holder class). This code path checks a stable field, so it should allow constant-folding when the direct target is available.

I see - so, since this is just a "query" you would like to avoid initialization just for this.

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PR Review Comment: https://git.openjdk.org/jdk/pull/13821#discussion_r1186079374