On Sun, 31 Jan 2021 20:14:01 GMT, Anton Kozlov <akoz...@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 62 commits: > > - Merge branch 'master' into jdk-macos > - Update copyright year for BsdAARCH64ThreadContext.java > - Fix inclusing of StubRoutines header > - Redo buildsys fix > - Revert harfbuzz changes, disable warnings for it > - Little adjustement of SlowSignatureHandler > - Partially bring previous commit > - Revert "Address feedback for signature generators" > > This reverts commit 50b55f6684cd21f8b532fa979b7b6fbb4613266d. > - Refactor CDS disabling > - Redo builsys support for aarch64-darwin > - ... and 52 more: > https://git.openjdk.java.net/jdk/compare/8a9004da...b421e0b4 src/hotspot/cpu/aarch64/interpreterRT_aarch64.cpp line 84: > 82: // on stack. Natural alignment for types are still in place, > 83: // for example double/long should be 8 bytes alligned > 84: This comment is a bit confusing because it's no longer #ifdef APPLE. Better move it up to Line 41. src/hotspot/cpu/aarch64/interpreterRT_aarch64.cpp line 352: > 350: > 351: #ifdef __APPLE__ > 352: virtual void pass_byte() Please remove ```#ifdef __APPLE__``` around this region. src/hotspot/cpu/aarch64/sharedRuntime_aarch64.cpp line 839: > 837: // The code unable to handle this, bailout. > 838: return -1; > 839: #endif This looks like a bug to me. The caller doesn't necessarily check the return value. See CallRuntimeNode::calling_convention. ------------- PR: https://git.openjdk.java.net/jdk/pull/2200
