RFR: 8264805: Remove the experimental Ahead-of-Time Compiler [v4]

[Igor Veresov]

On Thu, 8 Apr 2021 17:24:38 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> As part of [JEP 410](http://openjdk.java.net/jeps/410) remove code related to Ahead-of-Time Compiler from JDK: 
>> 
>> - `jdk.aot` module — the `jaotc` tool 
>> - `src/hotspot/share/aot` — loads AoT compiled code into VM for execution 
>> - related HotSpot code guarded by `#if INCLUDE_AOT` 
>> 
>> Additionally, remove tests as well as code in makefiles related to AoT compilation.
>> 
>> Tested hs-tier1-4
>
> Vladimir Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove exports from Graal module to jdk.aot

src/hotspot/share/jvmci/jvmciCodeInstaller.cpp line 1184:

> 1182:       }
> 1183:     } else if (jvmci_env()->isa_HotSpotMetaspaceConstantImpl(constant)) {
> 1184:       if (!_immutable_pic_compilation) {

All _immutable_pic_compilation mentions can be removed as well. It is true only for AOT compiles produced by Graal. It's never going to be used without AOT.

src/hotspot/share/oops/instanceKlass.hpp line 257:

> 255:     _misc_declares_nonstatic_concrete_methods = 1 << 6,  // directly declares non-static, concrete methods
> 256:     _misc_has_been_redefined                  = 1 << 7,  // class has been redefined
> 257:     _unused                                   = 1 << 8,  //

Any particular reason we don't want to remove this gap?

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PR: https://git.openjdk.java.net/jdk/pull/3398