JVMCI examples for Java Day Tokyo 2017
- http://www.oracle.co.jp/events/javaday/2017/
- D1-C1: Panamaを先取り！？ JVMTIでJITと遊ぶ
- https://www.slideshare.net/YaSuenag/panamajvmcijit
If you want to check original source which is introduced in this presentation, please checkout jdt-2017-session tag.
Requirements
- GCC
- GNU make
- JDK 9 or later
- Test source of JVMCI (included in OpenJDK source code)
How to build
$ cp <openjdk src>test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/TestAssembler.java code-injection/jdk/vm/ci/code/test/
$ cp <openjdk src>test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/TestHotSpotVMConfig.java code-injection/jdk/vm/ci/code/test/
$ cp <openjdk src>test/hotspot/jtreg/compiler/jvmci/jdk.vm.ci.code.test/src/jdk/vm/ci/code/test/amd64/AMD64TestAssembler.java code-injection/jdk/vm/ci/code/test/amd64/
$ make JAVA_HOME=/path/to/jdk9
If you want to run this example on JDK 9, you might need to change the C++ type of classMirrorHandleOffset to oop in TestHotSpotVMConfig.java .
JDK-8186777 changes this type to OopHandle . So you might see JVMCIError on your console.
How to run tests
Show complation level
$ make JAVA_HOME=/path/to/jdk9 complv
Show profiling data
$ make JAVA_HOME=/path/to/jdk9 showprof
Disallow JIT compilation
$ make JAVA_HOME=/path/to/jdk9 disallow-jit
Reprofile
$ make JAVA_HOME=/path/to/jdk9 reprofile
VPADDD AVX2 instruction
$ make JAVA_HOME=/path/to/jdk9 padd
System call (getpid)
$ make JAVA_HOME=/path/to/jdk9 syscall
libc function (getuid)
$ make JAVA_HOME=/path/to/jdk9 libc
dynamic function call
$ make JAVA_HOME=/path/to/jdk9 dyncall
Disassemble JVMCI installed code with HSDIS
If you want to disassemble JVMCI installed code with hsdis, enable -XX:+UnlockDiagnosticVMOptions and -XX:CompilerDirectivesFile in code-injection/Makefile . They are comment outed.
Build and install instruction of hsdis is here (in Japanese).