> This is the 6th PR for [JEP 483: Ahead-of-Time Class Loading & > Linking](https://bugs.openjdk.org/browse/JDK-8315737). > > The implementation of java.lang.invoke uses SoftReferences so that unused > MethodHandles, LambdaForms, etc, can be garbage collected. > > However, if we want to store java.lang.invoke objects in the AOT cache > ([JDK-8293336](https://bugs.openjdk.org/browse/JDK-8293336), the final step > in JEP 493), it's difficult to cache these SoftReferences -- SoftReferences > in turn point to ReferenceQueues, etc, which have dependencies on the current > execution state (Threads, etc) which are difficult to cache. > > The proposal is to add a new flag: `MethodHandleStatics.NO_SOFT_CACHE`. When > this flag is true, we avoid using SoftReferences, and store a direct > reference to the target object instead. > > [JDK-8293336](https://bugs.openjdk.org/browse/JDK-8293336) stores only > java.lang.invoke objects that refer to classes loaded by the > boot/platform/app loaders. These classes are never unloaded, so it's not > necessary to point to them using SoftReferences. > > This RFE modifies only the LambdaFormEditor and MethodTypeForm classes, as > that's the minimal modification required by > [JDK-8293336](https://bugs.openjdk.org/browse/JDK-8293336). > > --- > See [here](https://bugs.openjdk.org/browse/JDK-8315737) for the sequence of > dependent RFEs for implementing JEP 483.
Ioi Lam has updated the pull request incrementally with 93 additional commits since the last revision: - Merge branch 'jep-483-step-05-8293337-archive-method-handle-intrinsics' of /jdk3/yam/open into jep-483-step-06-8311071-avoid-soft-refs-in-java-lang-invoke - Merge branch 'jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap' into jep-483-step-05-8293337-archive-method-handle-intrinsics - Merge branch 'jep-483-step-03-8329706-implement-xx-aot-class-linking' of /jdk3/yak/open into jep-483-step-04-8293187-support-sun-invoke-util-wrapper-in-cds-archive-heap - Merge branch 'jep-483-step-02-8338018-rename-class-prelinker-to-aot-cp-resolver' into jep-483-step-03-8329706-implement-xx-aot-class-linking - Merge branch 'jep-483-step-01-8338017-add-aot-command-line-aliases' into jep-483-step-02-8338018-rename-class-prelinker-to-aot-cp-resolver - Merge branch 'master' of https://github.com/openjdk/jdk into jep-483-step-01-8338017-add-aot-command-line-aliases - 8340864: Remove unused lines related to vmClasses Reviewed-by: shade, kvn - 8340831: Simplify simple validation for class definition in MethodHandles.Lookup Reviewed-by: redestad - 8340838: Clean up MutableCallSite to use explicit release fence instead of AtomicInteger Reviewed-by: jrose, redestad, shade - 8340956: ProblemList 4 java/nio/channels/DatagramChannel tests on macosx-all Reviewed-by: liach, alanb, darcy, dfuchs - ... and 83 more: https://git.openjdk.org/jdk/compare/b383d24b...b8187149 ------------- Changes: - all: https://git.openjdk.org/jdk/pull/21049/files - new: https://git.openjdk.org/jdk/pull/21049/files/b383d24b..b8187149 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=21049&range=05 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21049&range=04-05 Stats: 12294 lines in 294 files changed: 9757 ins; 1520 del; 1017 mod Patch: https://git.openjdk.org/jdk/pull/21049.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21049/head:pull/21049 PR: https://git.openjdk.org/jdk/pull/21049
