Method opcodeUnit

dexfixer/src/com/android/dx/dex/code/InsnFormat.java:438–450

Helper method to combine an opcode and a second byte of data into the appropriate form for emitting into a code buffer. @param insn non-null; the instruction containing the opcode @param arg 0..255; arbitrary other byte value @return combined value

(DalvInsn insn, int arg)

     * @return combined value
     */
    protected static short opcodeUnit(DalvInsn insn, int arg) {
        if ((arg & 0xff) != arg) {
            throw new IllegalArgumentException("arg out of range 0..255");
        }

        int opcode = insn.getOpcode().getOpcode();

        if ((opcode & 0xff) != opcode) {
            throw new IllegalArgumentException("opcode out of range 0..255");
        }

        return (short) (opcode | (arg << 8));
    }

    /**
     * Helper method to get an extended (16-bit) opcode out of an