public class StartupInterpreterEngine extends InterpreterEngine {
    public IRubyObject interpret(ThreadContext context, Block block, IRubyObject self,
                                 InterpreterContext interpreterContext, RubyModule implClass,
                                 String name, IRubyObject[] args, Block blockArg) {

...
        int[] rescuePCs = interpreterContext.getRescueIPCs();
...
        while (ipc < n) {
            Instr instr = instrs[ipc];

            Operation operation = instr.getOperation();
            if (debug) {
                Interpreter.LOG.info("I: " + ipc + ", R: "  + rescuePCs[ipc] + " - " + instr + ">");
                Interpreter.interpInstrsCount++;
            } else if (profile) {
                Profiler.instrTick(operation);
                Interpreter.interpInstrsCount++;
            }

            try {
...
            } catch (Throwable t) {
                if (debug) extractToMethodToAvoidC2Crash(instr, t);

                ipc = rescuePCs == null ? -1 : rescuePCs[ipc];

                if (debug) {
                    Interpreter.LOG.info("in : " + interpreterContext.getScope() + ", caught Java throwable: " + t + "; excepting instr: " + instr);
                    Interpreter.LOG.info("ipc for rescuer: " + ipc);
                }

                if (ipc == -1) {
                    Helpers.throwException(t);
                } else {
                    exception = t;
                }
            }
        }
...