1 // RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s | FileCheck %s
2 
3 // CHECK: @_ZN5test11A1aE = constant i32 10, align 4
4 // CHECK: @_ZN5test212_GLOBAL__N_11AIiE1xE = internal global i32 0, align 4
5 // CHECK: @_ZN5test31AIiE1xE = weak_odr global i32 0, align 4
6 // CHECK: @_ZGVN5test31AIiE1xE = weak_odr global i64 0
7 
8 // CHECK: _ZN5test51U2k0E = global i32 0
9 // CHECK: _ZN5test51U2k1E = global i32 0
10 // CHECK: _ZN5test51U2k2E = constant i32 76
11 // CHECK-NOT: test51U2k3E
12 // CHECK-NOT: test51U2k4E
13 
14 // PR5564.
15 namespace test1 {
16   struct A {
17     static const int a = 10;
18   };
19 
20   const int A::a;
21 
22   struct S {
23     static int i;
24   };
25 
26   void f() {
27     int a = S::i;
28   }
29 }
30 
31 // Test that we don't use guards for initializing template static data
32 // members with internal linkage.
33 namespace test2 {
34   int foo();
35 
36   namespace {
37     template <class T> struct A {
38       static int x;
39     };
40 
41     template <class T> int A<T>::x = foo();
42     template struct A<int>;
43   }
44 
45   // CHECK-LABEL: define internal void @__cxx_global_var_init()
46   // CHECK:      [[TMP:%.*]] = call i32 @_ZN5test23fooEv()
47   // CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test212_GLOBAL__N_11AIiE1xE, align 4
48   // CHECK-NEXT: ret void
49 }
50 
51 // Test that we don't use threadsafe statics when initializing
52 // template static data members.
53 namespace test3 {
54   int foo();
55 
56   template <class T> struct A {
57     static int x;
58   };
59 
60   template <class T> int A<T>::x = foo();
61   template struct A<int>;
62 
63   // CHECK-LABEL: define internal void @__cxx_global_var_init1()
64   // CHECK:      [[GUARDBYTE:%.*]] = load i8* bitcast (i64* @_ZGVN5test31AIiE1xE to i8*)
65   // CHECK-NEXT: [[UNINITIALIZED:%.*]] = icmp eq i8 [[GUARDBYTE]], 0
66   // CHECK-NEXT: br i1 [[UNINITIALIZED]]
67   // CHECK:      [[TMP:%.*]] = call i32 @_ZN5test33fooEv()
68   // CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test31AIiE1xE, align 4
69   // CHECK-NEXT: store i64 1, i64* @_ZGVN5test31AIiE1xE
70   // CHECK-NEXT: br label
71   // CHECK:      ret void
72 }
73 
74 // Test that we can fold member lookup expressions which resolve to static data
75 // members.
76 namespace test4 {
77   struct A {
78     static const int n = 76;
79   };
80 
81   int f(A *a) {
82     // CHECK-LABEL: define i32 @_ZN5test41fEPNS_1AE
83     // CHECK: ret i32 76
84     return a->n;
85   }
86 }
87 
88 // Test that static data members in unions behave properly.
89 namespace test5 {
90   union U {
91     static int k0;
92     static const int k1;
93     static const int k2 = 76;
94     static const int k3;
95     static const int k4 = 81;
96   };
97   int U::k0;
98   const int U::k1 = (k0 = 9, 42);
99   const int U::k2;
100 
101   // CHECK: store i32 9, i32* @_ZN5test51U2k0E
102   // CHECK: store i32 {{.*}}, i32* @_ZN5test51U2k1E
103   // CHECK-NOT: store {{.*}} i32* @_ZN5test51U2k2E
104 }
105