RFR: 8355798: Implement JEP 514: Ahead-of-Time Command Line Ergonomics [v3]
Vladimir Kozlov
kvn at openjdk.org
Mon May 5 16:21:46 UTC 2025
On Mon, 5 May 2025 01:00:31 GMT, Ioi Lam <iklam at openjdk.org> wrote:
>> This is the implementation of the draft [JEP: Ahead-of-time Command Line Ergonomics](https://bugs.openjdk.org/browse/JDK-8350022)
>>
>> - Implemented new flag `AOTCacheOutput`, which can be used to create an AOT cache using the "one-command workflow"
>> - Added processing of the `JAVA_AOT_OPTIONS` environment variable that can supply extra VM options when creating an AOT cache
>> - Added `%p` substitution for `AOTCache`, `AOTCacheOutput`, and `AOTConfiguration` options
>>
>> Please see the [JEP](https://bugs.openjdk.org/browse/JDK-8350022) and [CSR](https://bugs.openjdk.org/browse/JDK-8356010) for detailed specification.
>>
>> Examples:
>>
>>
>> # Create an AOT cache with a single command:
>> $ java -cp HelloWorld.jar -XX:AOTMode=record -XX:AOTCacheOutput=foo.aot HelloWorld
>> Hello World
>> Temporary AOTConfiguration recorded: foo.aot.config
>> Launching child process /usr/bin/java to assemble AOT cache foo.aot using configuration foo.aot.config
>> Picked up JAVA_TOOL_OPTIONS: -Djava.class.path=HelloWorld.jar -XX:AOTCacheOutput=foo.aot -XX:AOTConfiguration=foo.aot.config -XX:AOTMode=create
>> Reading AOTConfiguration foo.aot.config and writing AOTCache foo.aot
>> AOTCache creation is complete: foo.aot 10240000 bytes
>>
>> # Create logging file for the AOT cache assembly phase
>> $ export AOT_TOOL_COMMAND=-Xlog:cds:file=log.txt
>> $ java -cp HelloWorld.jar -XX:AOTMode=record -XX:AOTCacheOutput=foo.aot HelloWorld
>>
>>
>> Note: the child process is launched with Java API because the HotSpot native APIs are not sufficient (no way to set env vars for child process).
>
> Ioi Lam has updated the pull request incrementally with one additional commit since the last revision:
>
> @vnkozlov comments
src/hotspot/share/cds/metaspaceShared.cpp line 1018:
> 1016: CDSConfig::disable_dumping_aot_code();
> 1017: }
> 1018:
Is this from merge form mainline?
-------------
PR Review Comment: https://git.openjdk.org/jdk/pull/24942#discussion_r2073756831
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