RFR: JDK-8256950: Add record attribute support to symbol generator CreateSymbols

[Chris Hegarty]

On Fri, 27 Nov 2020 13:21:15 GMT, Jan Lahoda <jlahoda at openjdk.org> wrote:

> Adding support for record classes in the historical data for ct.sym. This includes a few changes not strictly needed for the change:
> -updating and moving tests into test/langtools, so that it is easier to run them.
> -fixing Record attribute reading in javac's ClassReader (used for tests, but seems like the proper thing to do anyway).
> -fixing the -Xprint annotation processor to print record component annotations.
> 
> Changes to jdk.jdeps' classfile library are needed so that the ct.sym creation works.

make/langtools/src/classes/build/tools/symbolgenerator/CreateSymbols.java line 965:

> 963:                            new NestMembers_attribute(attributeString, nestMembers));
> 964:         }
> 965:         if (header.recordComponents != null && !header.recordComponents.isEmpty()) {

I am not sure of the exact logic here, but it is perfectly fine for a record attribute to contain zero components, and for the class to still be considered a "record class". But maybe that is not all that significant here? I just want to call it out so that it is considered.

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PR: https://git.openjdk.java.net/jdk/pull/1480