void (@NotNull InstructionKey fromKey, @NotNull InstructionKey nextKey) { if (fromKey.getOffset() >= 0 && nextKey.getOffset() < myInstructions.size()) { InstructionState state = myStates.get(nextKey); if (state == null) myStates.put(nextKey, state = new InstructionState(nextKey)); state.addBackwardTrace(fromKey); } }