Remove most truffle dependencies from com.oracle.svm.graal

[zakkak]

This PR tries to completely remove any dependencies on the truffle-api.jar for running native-image without runtime compilation support and truffle features.

It:

• Makes flags that depend on LibGraal optional
• Makes the native-image driver dependency on truffle-api.jar optional
• Removes most truffle dependencies from com.oracle.svm.graal
  • The last dependency I have not yet managed to properly remove is

    graal/substratevm/src/com.oracle.svm.graal/src/com/oracle/svm/graal/meta/RuntimeCodeInstaller.java

    Line 111 in 2f9a32b

    this.tier = compilation.getName().endsWith(TruffleCompiler.FIRST_TIER_COMPILATION_SUFFIX) ? TruffleCompiler.FIRST_TIER_INDEX : TruffleCompiler.LAST_TIER_INDEX;

    (suggestions are welcome)

[zakkak]

Hi @fniephaus,

I am not sure who is the most suitable to review this kind of change.
Could you please have a look and assign it accordingly?

Thank you

[zakkak]

Hi @pejovica, this is a kind reminder.

[zakkak]

@fniephaus could we please revisit this? It still seems relevant.

[christianwimmer]

@zakkak We are currently working on a large refactoring to decouple Truffle from the compiler. The end result of this should be that only the svm.truffle project depends on Truffle, and that project is also in a separate module. On the way to this, @olpaw and @chumer might be able to re-use some of the changes from this PR.

[zakkak]

Thanks for the update @christianwimmer.

Do I understand correctly that this will also remove all the truffle related packages from the jdk.internal.vm.compiler module (as introduced in #6503)?

Furthermore, is this planned for the 23.1 release?

Update: It looks like the answer to both questions is yes, see #6986

[chumer]

The goal of this refactoring is described here:
#6852

So in the future, truffle and all languages will be consumed from the application module-path.

The compiler and SVM will still depend on truffle-compiler.jar, which is a small set of interfaces shared between Truffle and the compiler. It is not quite minimal yet (it still contains some libgraal specific classes), but we will work on further reducing it.

[zakkak]

No longer relevant.