Java Day Tokyo 2017
Session schedule
Participation session
Get ahead of Panama! ?? Play with JIT with JVMCI
Priest
-Get Panama in advance! ?? Play with JIT with JVMCI
What’s JVMCI?
JEP 243: Java-Level JVM Compiler Interface
Summary Develop a Java based JVM compiler interface (JVMCI) enabling a compiler written in Java to be used by the JVM as a dynamic compiler
Summary: Make a compiler written in Java run on the JVM. → Write a (machine language) compiler in Java.
** It's amazing **
Evil point
- Write once, run anywhere --Please write byte [] by staring at the instruction set for each CPU.
- Java API --There is no such thing at the machine language level (it can be called) --Optimized by JIT --You write it
Let's change our perspective
- Write once, run anywhere --Since it is a set of JDK, it is not an application but a platform side
- Java API --Use with the compiler, not the machine language side --Optimized by JIT -** You write it **
Interesting point
--There is an API that can get the JIT status --There is also an API that can control the JIT status. --There is even an API that can acquire JIT profile information. --You can make system calls without using JNI --Another optimization structure linked with JIT can be introduced when creating a JVM-based language. --You can do a great job of handling data according to the JVM specifications with an assembler.
Impressions
--JDK is required and should rarely be used in the normal application layer ――It has enough uses for research and verification purposes. --There seems to be many uses in the JVM language system
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