The JIT codebase in C++ turned out to be too complex to maintain anymore. So someone thought: what if we rewrite JIT compiler in Java? Sounds crazy. But as a matter of fact, JIT is essentially a pure function that takes bytecode as input and returning machine code as output. Byte array in, byte array out. That's how GraalVM was born. Now you can plug-in a JIT compiler written in Java to a JVM. Suddenly the codebase became much more maintainable and developer friendly. GraalVM's JIT compiler quickly outperformed legacy JIT compiler. Essentially it is now much easier to write optimized machine code generation. But it turned out this was just the beginning.
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