RFR: 8257733: Move module-specific data from make to respective module [v2]

[Magnus Ihse Bursie]

On Tue, 8 Dec 2020 12:15:38 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Also, to clarify, for me there is a fundamental difference between `src/$MODULE` and `make/modules/$MODULE`. The former is the home of files that are part of the module, owned by the content team, and the `$MODULE` part is essential to delineate this content. The latter is owned by the build team, and is just a convenient way to organize the build system within the `make` directory. So it's clearly a no-no to put anything but `.gmk` files in `make/modules/$MODULE`.
>
> The mapping and nr tables, and the *-X.java.template files in make/data/charsetmapping are used to generate source code for the java.base and jdk.charsets modules. The stdcs-$OS files configure the package and module that each charset go into. If the tables used to generate the source files are moved to src/java.base then make/modules/jdk.charsets/Gensrc.gmk will probably need a new home too.

@AlanBateman The process of modularization was not fully completed with Project Jigsaw, and a few ugly warts remained. I was under the impression that these should be addressed in follow-up fixes, but this was unfortunately never done. Charsets and cldrconverter were both split between a core portion in java.base and the rest in jdk.charsets and jdk.localedata, respectively, but the split was never handled properly, but just "duct taped" in place.

I chose to put the data files used for both java.base and the "additional" modules in java.base, based on the comment that Naoto made in https://mail.openjdk.java.net/pipermail/build-dev/2020-March/027044.html:

> As to charsetmapping and cldrconverter, I believe they can reside in 
java.base, as jdk.charsets and jdk.localedata modules depend on it.

Of course it would be preferable to make a proper split, but that requires work done by the component teams to break the modules apart.

Specifically for  make/modules/jdk.charsets/Gensrc.gmk; the code in that file is more or less duplicated in make/modules/java.base/gensrc/GensrcCharsetMapping.gmk, since the same data set is processed twice, once for java.base and once for jdk.charsets. I don't think that means that make/modules/jdk.charsets/Gensrc.gmk should move to any other place.

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PR: https://git.openjdk.java.net/jdk/pull/1611