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I think you meant the machine code. The Java compiler produces bytecode from Java source. The C1 and C2 bytecode compilers in the JVM convert bytecode to machine code.

Yes, I agree if C2 recompiles something C1 already compiled, the C1-compiled machine code should be freed from the codecache.

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It will be freed but when c2 has emitted the new machine code, you can still have code on the stack of the user threads that use the code compiled by c1. When no more threads will use the c1 generated code, it will be swept from the code cache.

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