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Java front-end: jsr / ret support is missing #280

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@smowton

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@smowton

Specifically seen in edu/emory/mathcs/backport/java/util/concurrent/ConcurrentHashMap.class, jsr is a simple lightweight call-subroutine opcode (simply pushes a return address) and ret is the corresponding return, performing call/return within a compiled function. They are deprecated, but Java 5 compilers generate them and library JARs built to that standard are evidently still around.

smowton@fc186b4 provides a preliminary implementation.

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