RFR: 8256741: Reduce footprint of compiler interface data structures

[Chris Plummer]

On Fri, 20 Nov 2020 12:19:48 GMT, Claes Redestad <redestad at openjdk.org> wrote:

> A few data structure in the ci allocate unconditionally created GrowableArrays out-of-line, have fields that are newer updated/read, or are unnecessarily cached. By cleaning this up we can slightly reduce memory used for JIT compilations while slightly speeding them up.

src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/ci/ciObjectFactory.java line 82:

> 80:   public GrowableArray<ciSymbol> symbols() {
> 81:     Address addr = getAddress().addOffsetTo(symbolsField.getOffset());
> 82:     return GrowableArray.create(addr, ciSymbolConstructor);

It's unclear to me why these two changes were needed. Don't they produce the same result before and after?

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PR: https://git.openjdk.java.net/jdk/pull/1346