void pop()

in src/main/java/com/jetbrains/jdi/StackFrameImpl.java [516:565]
41 lines of code
10 McCabe index (conditional complexity)

    void pop() throws IncompatibleThreadStateException {
        validateStackFrame();
        // flush caches and disable caching until command completion
        try {
            PacketStream stream = thread.sendResumingCommand(
                    () -> JDWP.StackFrame.PopFrames.enqueueCommand(vm, thread, id));
            JDWP.StackFrame.PopFrames.waitForReply(vm, stream);
        } catch (JDWPException exc) {
            switch (exc.errorCode()) {
            case JDWP.Error.OPAQUE_FRAME:
                if (thread.isVirtual()) {
                    // We first need to find out if the current frame is native, or if the
                    // previous frame is native, in which case we throw NativeMethodException
                    for (int i = 0; i < 2; i++) {
                        StackFrameImpl sf;
                        try {
                            sf = (StackFrameImpl)thread.frame(i);
                        } catch (IndexOutOfBoundsException e) {
                            // This should never happen, but we need to check for it.
                            break;
                        }
                        sf.validateStackFrame();
                        MethodImpl meth = (MethodImpl)sf.location().method();
                        if (meth.isNative()) {
                            throw new NativeMethodException();
                        }
                    }
                    // No native frames involved. Must have been due to thread
                    // not being mounted.
                    throw new InvalidStackFrameException("Opaque frame");
//                    throw new OpaqueFrameException();
                } else {
                    throw new NativeMethodException();
                }
            case JDWP.Error.THREAD_NOT_SUSPENDED:
                throw new IncompatibleThreadStateException(
                         "Thread not current or suspended");
            case JDWP.Error.INVALID_THREAD:   /* zombie */
                throw new IncompatibleThreadStateException("zombie");
            case JDWP.Error.NO_MORE_FRAMES:
                throw new InvalidStackFrameException(
                         "No more frames on the stack");
            default:
                throw exc.toJDIException();
            }
        }

        // enable caching - suspended again
        vm.state().freeze();
    }