Apple has announced a long-term plan to transition their line of Macintosh computers from x64 to AArch64. We therefore expect to see broad demand for a macOS/AArch64 port of the JDK. Although it will be possible to run a macOS/x64 build of the JDK on AArch64-based systems via macOS's built-in Rosetta 2 translator, the translation. Apr 16, 2019 Oracle also provides the latest OpenJDK release under the open source GPL License at jdk.java.net. Mac OS X Version 10.6 and below Use Software Update available on the Apple menu to check that you have the most up-to-date version of Java 6 for your Mac. Managing Java versions on Mac OSX is a nightmare. I recently switched over to using JDK 1.7, deleting JDK 6 from my MacBook entirely (I also had traces of JDK 5 - this laptop has been updated a few times). Using the Command-line to find Java Versions - Mac. The Java Runtime (JRE) that you download from java.com or oracle.com contains a plugin to run Java content from your browser. In order to use the command line tools, you will need to download the Java Development Kit (JDK). The JRE and JDK are separate and can coexist on your system.
Summary
Port the JDK to macOS/AArch64.
Non-Goals
It is not a goal to implement all optional components (e.g., compilerintrinsics), even if they are implemented in other AArch64 ports.
It is not a goal to support the write-xor-execute (W^X)memory-protection policy for targets other than macOS/AArch64.
Motivation
Apple has announced a long-term plan to transition their line ofMacintosh computers from x64 to AArch64. We thereforeexpect to see broad demand for a macOS/AArch64 port of the JDK.
Although it will be possible to run a macOS/x64 build of the JDK onAArch64-based systems via macOS's built-in Rosetta 2translator, the translation will almost certainly introduce a significantperformance penalty.
Description
An AArch64 port already exists for Linux (JEP 237), and workis underway on an AArch64 port for Windows (JEP 388). Weexpect to reuse existing AArch64 code from these ports by employingconditional compilation — as is usual in ports of the JDK — toaccommodate differences in low-level conventions such as the applicationbinary interface (ABI) and the set of reserved processor registers.
macOS/AArch64 forbids memory segments from being executable and writeableat the same time, a policy known as write-xor-execute (W^X).The HotSpot VM routinely creates and modifies executable code, so thisJEP will implement W^X support in HotSpot for macOS/AArch64.
Testing
Testing will include, but not be limited to, compatibility testing withthe TCK, regression testing with jtreg, and validation with applications.The execution environment will include development platforms availablefrom Apple as well as consumer hardware, once it becomes available.
Risks and Assumptions
The changes for macOS/AArch64 risk breaking the existing Linux/AArch64,Windows/AArch64, and macOS/x64 ports. This risk will be reduced viaextensive pre-integration testing.
We expect to be able to implement the new ABI convention withreasonably small changes in the shared AArch64 code. We expect thefootprint of the macOS-specific code to be small.
Yamaha dgx 220 midi driver for mac. We expect the macOS/AArch64 and Windows/AArch64 ports to be similar insome ways, allowing some code to be shared across these ports and furtherreducing the macOS-specific AArch64 code.
We assume that the new version of macOS will not differ substantiallyfrom past versions, so that the amount of code change required for thenew version will be small.
We expect that supporting the W^X policy will be aided byoperating-system services such as the
pthread_jit_write_protect_npsystem call. If not, wewill develop alternative approaches. The first implementation will targetcorrectness with a possible performance penalty in uncommon cases, suchas deoptimizations.
Dependencies
Jdk Mac Dmg
The macOS/AArch64 port and the Windows/AArch64 port (JEP 388)will likely share some code. Some parts of this JEP will depend upon theintegration of JEP 388, while other parts can be developed in parallel.
