public static String opName(int opcode) {
    String result = OPCODE_NAMES[opcode];

    if (result == null) {
      result = "unused_" + Hex.u1(opcode);
      OPCODE_NAMES[opcode] = result;
    }

    return result;
  }
Gets the name of the given opcode.

@param opcode {@code >= 0, <= 255;} the opcode
@return {@code non-null;} its name
android/android_framework/dex-maker/src/main/java/com/android/dx/cf/code/ByteOps.java