1// RUN: %clang_cc1 -emit-llvm < %s -o -
2
3// A nice and complicated initialization example with unions from Python
4typedef int Py_ssize_t;
5
6typedef union _gc_head {
7  struct {
8    union _gc_head *gc_next;
9    union _gc_head *gc_prev;
10    Py_ssize_t gc_refs;
11  } gc;
12  long double dummy;  /* force worst-case alignment */
13} PyGC_Head;
14
15struct gc_generation {
16  PyGC_Head head;
17  int threshold; /* collection threshold */
18  int count;     /* count of allocations or collections of younger
19                    generations */
20};
21
22#define NUM_GENERATIONS 3
23#define GEN_HEAD(n) (&generations[n].head)
24
25/* linked lists of container objects */
26struct gc_generation generations[NUM_GENERATIONS] = {
27  /* PyGC_Head,                     threshold,      count */
28  {{{GEN_HEAD(0), GEN_HEAD(0), 0}}, 700,            0},
29  {{{GEN_HEAD(1), GEN_HEAD(1), 0}},  10,            0},
30  {{{GEN_HEAD(2), GEN_HEAD(2), 0}},  10,            0},
31};
32