1 | // RUN: %clang_cc1 -std=c++1z %s -emit-llvm -o - -triple x86_64-linux-gnu | FileCheck %s |
2 | |
3 | struct Q { |
4 | // CHECK: @_ZN1Q1kE = linkonce_odr constant i32 5, comdat |
5 | static constexpr int k = 5; |
6 | }; |
7 | const int &r = Q::k; |
8 | |
9 | int f(); |
10 | |
11 | // const does not imply internal linkage. |
12 | // CHECK: @external_inline = linkonce_odr constant i32 5, comdat |
13 | inline const int external_inline = 5; |
14 | const int &use1 = external_inline; |
15 | |
16 | // static still does, though. |
17 | // CHECK: @_ZL15internal_inline = internal constant i32 5 |
18 | static inline const int internal_inline = 5; |
19 | const int &use2 = internal_inline; |
20 | |
21 | int a = f(); |
22 | // CHECK: @b = linkonce_odr global i32 0, comdat |
23 | // CHECK: @_ZGV1b = linkonce_odr global i64 0, comdat($b) |
24 | inline int b = f(); |
25 | int c = f(); |
26 | |
27 | // For compatibility with C++11 and C++14, an out-of-line declaration of a |
28 | // static constexpr local variable promotes the variable to weak_odr. |
29 | struct compat { |
30 | static constexpr int a = 1; |
31 | static constexpr int b = 2; |
32 | static constexpr int c = 3; |
33 | static inline constexpr int d = 4; |
34 | static const int e = 5; |
35 | static const int f = 6; |
36 | static const int g = 7; |
37 | }; |
38 | const int &compat_use_before_redecl = compat::b; |
39 | const int compat::a; |
40 | const int compat::b; |
41 | const int compat::c; |
42 | const int compat::d; |
43 | const int compat::e; |
44 | constexpr int compat::f; |
45 | constexpr inline int compat::g; |
46 | const int &compat_use_after_redecl1 = compat::c; |
47 | const int &compat_use_after_redecl2 = compat::d; |
48 | const int &compat_use_after_redecl3 = compat::g; |
49 | // CHECK-DAG: @_ZN6compat1bE = weak_odr constant i32 2 |
50 | // CHECK-DAG: @_ZN6compat1aE = weak_odr constant i32 1 |
51 | // CHECK-DAG: @_ZN6compat1cE = weak_odr constant i32 3 |
52 | // CHECK-DAG: @_ZN6compat1dE = linkonce_odr constant i32 4 |
53 | // CHECK-DAG: @_ZN6compat1eE = constant i32 5 |
54 | // CHECK-DAG: @_ZN6compat1fE = weak_odr constant i32 6 |
55 | // CHECK-DAG: @_ZN6compat1gE = linkonce_odr constant i32 7 |
56 | |
57 | template<typename T> struct X { |
58 | static int a; |
59 | static inline int b; |
60 | static int c; |
61 | static const int d; |
62 | static int e; |
63 | }; |
64 | // CHECK: @_ZN1XIiE1aE = linkonce_odr global i32 10 |
65 | // CHECK: @_ZN1XIiE1bE = global i32 20 |
66 | // CHECK-NOT: @_ZN1XIiE1cE |
67 | // CHECK: @_ZN1XIiE1dE = linkonce_odr constant i32 40 |
68 | // CHECK: @_ZN1XIiE1eE = linkonce_odr global i32 50 |
69 | template<> inline int X<int>::a = 10; |
70 | int &use3 = X<int>::a; |
71 | template<> int X<int>::b = 20; |
72 | template<> inline int X<int>::c = 30; |
73 | template<typename T> constexpr int X<T>::d = 40; |
74 | template<typename T> inline int X<T>::e = 50; |
75 | const int *use_x_int_d = &X<int>::d; |
76 | const int *use_x_int_e = &X<int>::e; |
77 | |
78 | template<typename T> struct Y; |
79 | template<> struct Y<int> { |
80 | static constexpr int a = 123; |
81 | static constexpr int b = 456; |
82 | static constexpr int c = 789; |
83 | }; |
84 | // CHECK: @_ZN1YIiE1aE = weak_odr constant i32 123 |
85 | constexpr int Y<int>::a; |
86 | // CHECK: @_ZN1YIiE1bE = linkonce_odr constant i32 456 |
87 | const int &yib = Y<int>::b; |
88 | // CHECK-NOT: @_ZN1YIiE1cE |
89 | |
90 | // CHECK-LABEL: define {{.*}}global_var_init |
91 | // CHECK: call i32 @_Z1fv |
92 | |
93 | // CHECK-LABEL: define {{.*}}global_var_init |
94 | // CHECK-NOT: comdat |
95 | // CHECK-SAME: {{$}} |
96 | // CHECK: load atomic {{.*}} acquire |
97 | // CHECK: br |
98 | // CHECK: __cxa_guard_acquire(i64* @_ZGV1b) |
99 | // CHECK: br |
100 | // CHECK: call i32 @_Z1fv |
101 | // CHECK: __cxa_guard_release(i64* @_ZGV1b) |
102 | |
103 | // CHECK-LABEL: define {{.*}}global_var_init |
104 | // CHECK: call i32 @_Z1fv |
105 | |
106 | template<typename T> inline int d = f(); |
107 | int e = d<int>; |
108 | |
109 | // CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat |
110 | // CHECK: _ZGV1dIiE |
111 | // CHECK-NOT: __cxa_guard_acquire(i64* @_ZGV1b) |
112 | // CHECK: call i32 @_Z1fv |
113 | // CHECK-NOT: __cxa_guard_release(i64* @_ZGV1b) |
114 | |
115 | namespace PR35599 { |
116 | struct Marker1 {}; |
117 | struct Marker2 {}; |
118 | |
119 | template <typename> |
120 | struct Foo { |
121 | struct Bar { Bar(); }; |
122 | inline static Bar bar; |
123 | }; |
124 | |
125 | void run() { |
126 | // All we want here are ODR uses. Anything that requires that the type is |
127 | // complete is uninteresting. |
128 | #pragma clang diagnostic push |
129 | #pragma clang diagnostic ignored "-Wunused-value" |
130 | Foo<Marker1>::bar; |
131 | #pragma clang diagnostic pop |
132 | static_cast<void>(Foo<Marker2>::bar); |
133 | } |
134 | |
135 | // CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat |
136 | // CHECK: call void @_ZN7PR355993FooINS_7Marker1EE3BarC1Ev |
137 | // CHECK-LABEL: define {{.*}}global_var_init{{.*}}comdat |
138 | // CHECK: call void @_ZN7PR355993FooINS_7Marker2EE3BarC1Ev |
139 | } |
140 | |