lldb/examples/synthetic/bitfield/program.cpp

   1 typedef unsigned int uint32_t;
   2
   3 enum MaskingOperator {
   4   eMaskingOperatorDefault = 0,
   5   eMaskingOperatorAnd = 1,
   6   eMaskingOperatorOr = 2,
   7   eMaskingOperatorXor = 3,
   8   eMaskingOperatorNand = 4,
   9   eMaskingOperatorNor = 5
  10 };
  11
  12 class MaskedData {
  13 private:
  14   uint32_t value;
  15   uint32_t mask;
  16   MaskingOperator oper;
  17
  18 public:
  19   MaskedData(uint32_t V = 0, uint32_t M = 0,
  20              MaskingOperator P = eMaskingOperatorDefault)
  21       : value(V), mask(M), oper(P) {}
  22
  23   uint32_t apply() {
  24     switch (oper) {
  25     case eMaskingOperatorAnd:
  26       return value & mask;
  27     case eMaskingOperatorOr:
  28       return value | mask;
  29     case eMaskingOperatorXor:
  30       return value ^ mask;
  31     case eMaskingOperatorNand:
  32       return ~(value & mask);
  33     case eMaskingOperatorNor:
  34       return ~(value | mask);
  35     case eMaskingOperatorDefault: // fall through
  36     default:
  37       return value;
  38     }
  39   }
  40
  41   void setValue(uint32_t V) { value = V; }
  42
  43   void setMask(uint32_t M) { mask = M; }
  44
  45   void setOperator(MaskingOperator P) { oper = P; }
  46 };
  47
  48 int main() {
  49   MaskedData data_1(0xFF0F, 0xA01F, eMaskingOperatorAnd);
  50   MaskedData data_2(data_1.apply(), 0x1AFC, eMaskingOperatorXor);
  51   MaskedData data_3(data_2.apply(), 0xFFCF, eMaskingOperatorOr);
  52   MaskedData data_4(data_3.apply(), 0xAABC, eMaskingOperatorAnd);
  53   MaskedData data_5(data_4.apply(), 0xFFAC, eMaskingOperatorNor);
  54   MaskedData data_6(data_5.apply(), 0x0000BEEF, eMaskingOperatorAnd);
  55   return data_6.apply(); // <-- what comes out of here?
  56 }