lldb/test/API/lang/c/bitfields/main.c

   1 #include <stdint.h>
   2
   3 struct Bits {
   4   uint32_t    : 1;
   5   uint32_t    b1 : 1;
   6   uint32_t    b2 : 2;
   7   uint32_t    : 2;
   8   uint32_t    b3 : 3;
   9   // Unnamed bitfield (this will get removed).
  10   uint32_t    : 2;
  11   uint32_t    b4 __attribute__ ((aligned(16)));
  12   uint32_t    b5 : 5;
  13   uint32_t    b6 : 6;
  14   uint32_t    b7 : 7;
  15   uint32_t    four : 4;
  16 };
  17
  18 struct MoreBits {
  19   uint32_t a : 3;
  20   uint8_t : 1;
  21   uint8_t b : 1;
  22   uint8_t c : 1;
  23   uint8_t d : 1;
  24 };
  25 struct MoreBits more_bits;
  26
  27 struct ManySingleBits {
  28   uint16_t b1 : 1, b2 : 1, b3 : 1, b4 : 1, b5 : 1, b6 : 1, b7 : 1, b8 : 1,
  29       b9 : 1, b10 : 1, b11 : 1, b12 : 1, b13 : 1, b14 : 1, b15 : 1, b16 : 1,
  30       b17 : 1;
  31 };
  32 struct ManySingleBits many_single_bits;
  33
  34 struct LargePackedBits {
  35   uint64_t a : 36;
  36   uint64_t b : 36;
  37 } __attribute__((packed));
  38
  39 #pragma pack(1)
  40 struct PackedBits {
  41   char a;
  42   uint32_t b : 5, c : 27;
  43 };
  44 #pragma pack()
  45
  46 int main(int argc, char const *argv[]) {
  47   struct Bits bits;
  48   bits.b1 = 1;
  49   bits.b2 = 3;
  50   bits.b3 = 7;
  51   bits.b4 = 15;
  52   bits.b5 = 31;
  53   bits.b6 = 63;
  54   bits.b7 = 127;
  55   bits.four = 15;
  56
  57   more_bits.a = 3;
  58   more_bits.b = 0;
  59   more_bits.c = 1;
  60   more_bits.d = 0;
  61
  62   many_single_bits.b1 = 1;
  63   many_single_bits.b5 = 1;
  64   many_single_bits.b7 = 1;
  65   many_single_bits.b13 = 1;
  66
  67   struct PackedBits packed;
  68   packed.a = 'a';
  69   packed.b = 10;
  70   packed.c = 0x7112233;
  71
  72   struct LargePackedBits large_packed =
  73       (struct LargePackedBits){0xcbbbbaaaa, 0xdffffeeee};
  74   struct LargePackedBits *large_packed_ptr = &large_packed;
  75
  76   return 0; // break here
  77 }