clang/test/CodeGen/union.c

   1 // RUN: %clang_cc1 %s -emit-llvm -o -
   2
   3 union u_tag {
   4   int a;
   5   float b;
   6 } u;
   7
   8 void f(void) {
   9   u.b = 11;
  10 }
  11
  12 float get_b(union u_tag *my_u) {
  13   return my_u->b;
  14 }
  15
  16 int f2( float __x ) {
  17   union{
  18     float __f;
  19     unsigned int __u;
  20   }__u;
  21   return (int)(__u.__u >> 31);
  22 }
  23
  24 typedef union { int i; int *j; } value;
  25
  26 int f3(value v) {
  27   return *v.j;
  28 }
  29
  30 enum E9 { one, two };
  31 union S65 { enum E9 a; } ; union S65 s65;
  32 void fS65(void) { enum E9 e = s65.a; }
  33
  34 typedef union{
  35   unsigned char x[65536];
  36 } q;
  37 int qfunc(void) {q buf; unsigned char* x = buf.x;}
  38
  39 union RR {_Bool a : 1;} RRU;
  40 int RRF(void) {return RRU.a;}
  41
  42 // PR6164
  43 typedef union T0 { unsigned int : 0; } T0;
  44 T0 t0;
  45
  46 union { int large_bitfield: 31; char c } u2;
  47
  48 struct dt_t_s {
  49   union {
  50     long long u : 56;
  51   } __attribute__((packed));
  52 };
  53 struct {
  54   struct {
  55     struct {
  56       struct dt_t_s t;
  57     };
  58   };
  59 } a;