1// RUN: %clang_cc1 -triple x86_64-pc-linux -emit-llvm -o - %s | FileCheck %s
2// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | \
3// RUN: FileCheck --check-prefix=MACHO %s
4
5// CHECK: @_ZN5test11A1aE = constant i32 10, align 4
6// CHECK: @_ZN5test212_GLOBAL__N_11AIiE1xE = internal global i32 0, align 4
7// CHECK: @_ZN5test31AIiE1xE = weak_odr global i32 0, comdat, align 4
8// CHECK: @_ZGVN5test31AIiE1xE = weak_odr global i64 0, comdat($_ZN5test31AIiE1xE)
9// MACHO: @_ZGVN5test31AIiE1xE = weak_odr global i64 0
10// MACHO-NOT: comdat
11
12// CHECK: _ZN5test51U2k0E = global i32 0
13// CHECK: _ZN5test51U2k1E = global i32 0
14// CHECK: _ZN5test51U2k2E = constant i32 76
15// CHECK-NOT: test51U2k3E
16// CHECK-NOT: test51U2k4E
17
18// PR5564.
19namespace test1 {
20  struct A {
21    static const int a = 10;
22  };
23
24  const int A::a;
25
26  struct S {
27    static int i;
28  };
29
30  void f() {
31    int a = S::i;
32  }
33}
34
35// Test that we don't use guards for initializing template static data
36// members with internal linkage.
37namespace test2 {
38  int foo();
39
40  namespace {
41    template <class T> struct A {
42      static int x;
43    };
44
45    template <class T> int A<T>::x = foo();
46    template struct A<int>;
47  }
48
49  // CHECK-LABEL: define internal void @__cxx_global_var_init()
50  // CHECK:      [[TMP:%.*]] = call i32 @_ZN5test23fooEv()
51  // CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test212_GLOBAL__N_11AIiE1xE, align 4
52  // CHECK-NEXT: ret void
53}
54
55// Test that we don't use threadsafe statics when initializing
56// template static data members.
57namespace test3 {
58  int foo();
59
60  template <class T> struct A {
61    static int x;
62  };
63
64  template <class T> int A<T>::x = foo();
65  template struct A<int>;
66
67  // CHECK-LABEL: define internal void @__cxx_global_var_init.1() {{.*}} comdat($_ZN5test31AIiE1xE)
68  // MACHO-LABEL: define internal void @__cxx_global_var_init.1()
69  // MACHO-NOT: comdat
70  // CHECK:      [[GUARDBYTE:%.*]] = load i8, i8* bitcast (i64* @_ZGVN5test31AIiE1xE to i8*)
71  // CHECK-NEXT: [[UNINITIALIZED:%.*]] = icmp eq i8 [[GUARDBYTE]], 0
72  // CHECK-NEXT: br i1 [[UNINITIALIZED]]
73  // CHECK:      [[TMP:%.*]] = call i32 @_ZN5test33fooEv()
74  // CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test31AIiE1xE, align 4
75  // CHECK-NEXT: store i64 1, i64* @_ZGVN5test31AIiE1xE
76  // CHECK-NEXT: br label
77  // CHECK:      ret void
78}
79
80// Test that we can fold member lookup expressions which resolve to static data
81// members.
82namespace test4 {
83  struct A {
84    static const int n = 76;
85  };
86
87  int f(A *a) {
88    // CHECK-LABEL: define i32 @_ZN5test41fEPNS_1AE
89    // CHECK: ret i32 76
90    return a->n;
91  }
92}
93
94// Test that static data members in unions behave properly.
95namespace test5 {
96  union U {
97    static int k0;
98    static const int k1;
99    static const int k2 = 76;
100    static const int k3;
101    static const int k4 = 81;
102  };
103  int U::k0;
104  const int U::k1 = (k0 = 9, 42);
105  const int U::k2;
106
107  // CHECK: store i32 9, i32* @_ZN5test51U2k0E
108  // CHECK: store i32 {{.*}}, i32* @_ZN5test51U2k1E
109  // CHECK-NOT: store {{.*}} i32* @_ZN5test51U2k2E
110}
111