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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($_ZN5test31AIiE1xE)
9 // MACHO: @_ZGVN5test31AIiE1xE = weak_odr global i64 0
10 // MACHO-NOT: comdat
11 
12 // CHECK: _ZN5test51U2k0E = global i32 0
13 // CHECK: _ZN5test51U2k1E = global i32 0
14 // CHECK: _ZN5test51U2k2E = constant i32 76
15 // CHECK-NOT: test51U2k3E
16 // CHECK-NOT: test51U2k4E
17 
18 // PR5564.
19 namespace test1 {
20   struct A {
21     static const int a = 10;
22   };
23 
24   const int A::a;
25 
26   struct S {
27     static int i;
28   };
29 
f()30   void f() {
31     int a = S::i;
32   }
33 }
34 
35 // Test that we don't use guards for initializing template static data
36 // members with internal linkage.
37 namespace test2 {
38   int foo();
39 
40   namespace {
41     template <class T> struct A {
42       static int x;
43     };
44 
45     template <class T> int A<T>::x = foo();
46     template struct A<int>;
47   }
48 
49   // CHECK-LABEL: define internal void @__cxx_global_var_init()
50   // CHECK:      [[TMP:%.*]] = call i32 @_ZN5test23fooEv()
51   // CHECK-NEXT: store i32 [[TMP]], i32* @_ZN5test212_GLOBAL__N_11AIiE1xE, align 4
52   // CHECK-NEXT: ret void
53 }
54 
55 // Test that we don't use threadsafe statics when initializing
56 // template static data members.
57 namespace test3 {
58   int foo();
59 
60   template <class T> struct A {
61     static int x;
62   };
63 
64   template <class T> int A<T>::x = foo();
65   template struct A<int>;
66 
67   // CHECK-LABEL: define internal void @__cxx_global_var_init.1() {{.*}} comdat($_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.
82 namespace test4 {
83   struct A {
84     static const int n = 76;
85   };
86 
f(A * a)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.
95 namespace 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