test/CodeGen/designated-initializers.c

   1 // RUN: %clang_cc1 -triple i386-unknown-unknown %s -emit-llvm -o - | FileCheck %s
   2
   3 struct foo {
   4     void *a;
   5     int b;
   6 };
   7
   8 // CHECK: @u = global %union.anon zeroinitializer
   9 union { int i; float f; } u = { };
  10
  11 // CHECK: @u2 = global %1 { i32 0, [4 x i8] undef }
  12 union { int i; double f; } u2 = { };
  13
  14 // CHECK: @u3 = global %2 zeroinitializer
  15 union { double f; int i; } u3 = { };
  16
  17 // CHECK: @b = global [2 x i32] [i32 0, i32 22]
  18 int b[2] = {
  19   [1] = 22
  20 };
  21
  22 // PR6955
  23
  24 struct ds {
  25   struct {
  26     struct {
  27       short a;
  28     };
  29     short b;
  30     struct {
  31       short c;
  32     };
  33   };
  34 };
  35
  36 // Traditional C anonymous member init
  37 struct ds ds0 = { { { .a = 0 } } };
  38 // C1X lookup-based anonymous member init cases
  39 struct ds ds1 = { { .a = 1 } };
  40 struct ds ds2 = { { .b = 1 } };
  41 struct ds ds3 = { .a = 0 };
  42 // CHECK: @ds4 = global %3 { %4 { %struct.anon zeroinitializer, i16 0, %struct.anon { i16 1 } } }
  43 struct ds ds4 = { .c = 1 };
  44 struct ds ds5 = { { { .a = 0 } }, .b = 1 };
  45 struct ds ds6 = { { .a = 0, .b = 1 } };
  46 // CHECK: @ds7 = global %3 { %4 { %struct.anon { i16 2 }, i16 3, %struct.anon zeroinitializer } }
  47 struct ds ds7 = {
  48   { {
  49       .a = 1
  50     } },
  51   .a = 2,
  52   .b = 3
  53 };
  54
  55 void test1(int argc, char **argv)
  56 {
  57   // CHECK: internal global %struct.foo { i8* null, i32 1024 }
  58   static struct foo foo = {
  59     .b = 1024,
  60   };
  61
  62   // CHECK: bitcast %union.anon* %u2
  63   // CHECK: call void @llvm.memset
  64    union { int i; float f; } u2 = { };
  65
  66   // CHECK-NOT: call void @llvm.memset
  67   union { int i; float f; } u3;
  68
  69   // CHECK: ret void
  70 }
  71
  72
  73 // PR7151
  74 struct S {
  75   int nkeys;
  76   int *keys;
  77   union {
  78     void *data;
  79   };
  80 };
  81
  82 void test2() {
  83   struct S *btkr;
  84
  85   *btkr = (struct S) {
  86     .keys  = 0,
  87     { .data  = 0 },
  88   };
  89 }