The tradeoff is complexity. The microcode must be carefully arranged so that the instructions in delay slots are either useful setup for both paths, or at least harmless if the redirect fires. Not every case is as clean as RETF. When a PLA redirect interrupts an LCALL, the return address is already pushed onto the microcode call stack (yes, the 386 has a microcode call stack) -- the redirected code must account for this stale entry. When multiple protection tests overlap, or when a redirect fires during a delay slot of another jump, the control flow becomes hard to reason about. During the FPGA core implementation, protection delay slot interactions were consistently the most difficult bugs to track down.
{ createdAt: 1 },
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The protocol is dead simple. The browser sends JBOX_PING through the terminal. CompileServer responds with JBOX_PONG. That’s how the SDK knows the JVM is alive. Then to compile and run, it sends JBOX_COMPILE ClassName followed by the source code followed by JBOX_END. CompileServer compiles, runs, prints the output, and finishes with JBOX_EXIT:0 (or whatever the exit code was). The whole thing uses BufferedReader because anything fancier (like JLine) breaks after snapshot restore.