[OpenJDK 2D-Dev] RFR: 8253795: Implementation of JEP 391: macOS/AArch64 Port [v29]
erikj at openjdk.java.net
Tue Mar 23 12:52:55 UTC 2021
On Mon, 22 Mar 2021 12:50:14 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:
>> Please review the implementation of JEP 391: macOS/AArch64 Port.
>> It's heavily based on existing ports to linux/aarch64, macos/x86_64, and windows/aarch64.
>> Major changes are in:
>> * src/hotspot/cpu/aarch64: support of the new calling convention (subtasks JDK-8253817, JDK-8253818)
>> * src/hotspot/os_cpu/bsd_aarch64: copy of os_cpu/linux_aarch64 with necessary adjustments (JDK-8253819)
>> * src/hotspot/share, test/hotspot/gtest: support of write-xor-execute (W^X), required on macOS/AArch64 platform. It's implemented with pthread_jit_write_protect_np provided by Apple. The W^X mode is local to a thread, so W^X mode change relates to the java thread state change (for java threads). In most cases, JVM executes in write-only mode, except when calling a generated stub like SafeFetch, which requires a temporary switch to execute-only mode. The same execute-only mode is enabled when a java thread executes in java or native states. This approach of managing W^X mode turned out to be simple and efficient enough.
>> * src/jdk.hotspot.agent: serviceability agent implementation (JDK-8254941)
> Anton Kozlov has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 115 commits:
> - Merge branch 'master' into jdk-macos
> - JDK-8262491: bsd_aarch64 part
> - JDK-8263002: bsd_aarch64 part
> - Merge remote-tracking branch 'upstream/jdk/master' into jdk-macos
> - Wider #ifdef block
> - Fix most of issues in java/foreign/ tests
> Failures related to va_args are tracked in JDK-8263512.
> - Add Azul copyright
> - Update Oracle copyright years
> - Use Thread::current_or_null_safe in SafeFetch
> - 8262903: [macos_aarch64] Thread::current() called on detached thread
> - ... and 105 more: https://git.openjdk.java.net/jdk/compare/a9d2267f...5add9269
Build changes look good.
Marked as reviewed by erikj (Reviewer).
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