Types of JIT Compilers

 Just-in Time Compiler

The basic definition of compiler as “a program that translates the source code to a machine executable code.

 
Using a compiler, Java source code is converted to Java byte code (.class files).

Once this is done, JVM loads the .class files at run time and converts them to a machine understandable code using an interpreter.

            JIT stands for just-in-time compiler. It converts the MSIL code to CPU native code as it is needed during code execution. It is called just-in-time since it converts the MSIL code to CPU native code; when it is required within code execution otherwise it will not do nothing with that MSIL code.

Different Types of JIT

1. Normal JIT

            This complies only those methods that are called at runtime. These methods are compiled only first time when they are called, and then they are stored in memory cache. This memory cache is commonly called as JITTED. When the same methods are called again, the complied code from cache is used for execution.

2. Econo JIT

This complies only those methods that are called at runtime and removes them from memory after execution.

3. Pre JIT

This complies entire MSIL code into native code in a single compilation cycle. This is done at the time of deployment of the application.