1 // RUN: %clang_cc1 -std=c++11 -S -emit-llvm -o - %s -triple x86_64-linux-gnu | FileCheck %s
2 
3 struct A { int a, b; int f(); };
4 
5 namespace NonAggregateCopyInAggregateInit { // PR32044
6   struct A { constexpr A(int n) : x(n), y() {} int x, y; } extern a;
7   // CHECK-DAG: @_ZN31NonAggregateCopyInAggregateInit1bE = global %{{.*}} { %[[A:.*]]* @_ZN31NonAggregateCopyInAggregateInit1aE }
8   struct B { A &p; } b{{a}};
9   // CHECK-DAG: @_ZGRN31NonAggregateCopyInAggregateInit1cE_ = internal global %[[A]] { i32 1, i32 0 }
10   // CHECK-DAG: @_ZN31NonAggregateCopyInAggregateInit1cE = global %{{.*}} { %{{.*}}* @_ZGRN31NonAggregateCopyInAggregateInit1cE_ }
11   struct C { A &&p; } c{{1}};
12 }
13 
14 namespace NearlyZeroInit {
15   // CHECK-DAG: @_ZN14NearlyZeroInit1aE = global {{.*}} <{ i32 1, i32 2, i32 3, [120 x i32] zeroinitializer }>
16   int a[123] = {1, 2, 3};
17   // CHECK-DAG: @_ZN14NearlyZeroInit1bE = global {{.*}} { i32 1, <{ i32, [2147483647 x i32] }> <{ i32 2, [2147483647 x i32] zeroinitializer }> }
18   struct B { int n; int arr[1024 * 1024 * 1024 * 2u]; } b = {1, {2}};
19 }
20 
21 namespace PR37560 {
22   union U {
23     char x;
24     int a;
25   };
26   // FIXME: [dcl.init]p2, the padding bits of the union object should be
27   // initialized to 0, not undef, which would allow us to collapse the tail
28   // of these arrays to zeroinitializer.
29   // CHECK-DAG: @_ZN7PR375601cE = global <{ { i8, [3 x i8] } }> <{ { i8, [3 x i8] } { i8 0, [3 x i8] undef } }>
30   U c[1] = {};
31   // CHECK-DAG: @_ZN7PR375601dE = global {{.*}} <{ { i8, [3 x i8] } { i8 97, [3 x i8] undef }, %"{{[^"]*}}" { i32 123 }, { i8, [3 x i8] } { i8 98, [3 x i8] undef }, { i8, [3 x i8] } { i8 0, [3 x i8] undef },
32   U d[16] = {'a', {.a = 123}, 'b'};
33   // CHECK-DAG: @_ZN7PR375601eE = global {{.*}} <{ %"{{[^"]*}}" { i32 123 }, %"{{[^"]*}}" { i32 456 }, { i8, [3 x i8] } { i8 0, [3 x i8] undef },
34   U e[16] = {{.a = 123}, {.a = 456}};
35 
36   union V {
37     int a;
38     char x;
39   };
40   // CHECK-DAG: @_ZN7PR375601fE = global [1 x %"{{[^"]*}}"] zeroinitializer
41   V f[1] = {};
42   // CHECK-DAG: @_ZN7PR375601gE = global {{.*}} <{ { i8, [3 x i8] } { i8 97, [3 x i8] undef }, %"{{[^"]*}}" { i32 123 }, { i8, [3 x i8] } { i8 98, [3 x i8] undef }, [13 x %"{{[^"]*}}"] zeroinitializer }>
43   V g[16] = {{.x = 'a'}, {.a = 123}, {.x = 'b'}};
44   // CHECK-DAG: @_ZN7PR375601hE = global {{.*}} <{ %"{{[^"]*}}" { i32 123 }, %"{{[^"]*}}" { i32 456 }, [14 x %"{{[^"]*}}"] zeroinitializer }>
45   V h[16] = {{.a = 123}, {.a = 456}};
46   // CHECK-DAG: @_ZN7PR375601iE = global [4 x %"{{[^"]*}}"] [%"{{[^"]*}}" { i32 123 }, %"{{[^"]*}}" { i32 456 }, %"{{[^"]*}}" zeroinitializer, %"{{[^"]*}}" zeroinitializer]
47   V i[4] = {{.a = 123}, {.a = 456}};
48 }
49 
50 // CHECK-LABEL: define {{.*}}@_Z3fn1i(
51 int fn1(int x) {
52   // CHECK: %[[INITLIST:.*]] = alloca %struct.A
53   // CHECK: %[[A:.*]] = getelementptr inbounds %struct.A, %struct.A* %[[INITLIST]], i32 0, i32 0
54   // CHECK: store i32 %{{.*}}, i32* %[[A]], align 4
55   // CHECK: %[[B:.*]] = getelementptr inbounds %struct.A, %struct.A* %[[INITLIST]], i32 0, i32 1
56   // CHECK: store i32 5, i32* %[[B]], align 4
57   // CHECK: call i32 @_ZN1A1fEv(%struct.A* %[[INITLIST]])
58   return A{x, 5}.f();
59 }
60 
61 struct B { int &r; int &f() { return r; } };
62 
63 // CHECK-LABEL: define {{.*}}@_Z3fn2Ri(
64 int &fn2(int &v) {
65   // CHECK: %[[INITLIST2:.*]] = alloca %struct.B, align 8
66   // CHECK: %[[R:.*]] = getelementptr inbounds %struct.B, %struct.B* %[[INITLIST2:.*]], i32 0, i32 0
67   // CHECK: store i32* %{{.*}}, i32** %[[R]], align 8
68   // CHECK: call nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) i32* @_ZN1B1fEv(%struct.B* %[[INITLIST2:.*]])
69   return B{v}.f();
70 }
71 
72 // CHECK-LABEL: define {{.*}}@__cxx_global_var_init(
73 //
74 // CHECK: call {{.*}}@_ZN14NonTrivialInit1AC1Ev(
75 // CHECK: getelementptr inbounds {{.*}}, i64 1
76 // CHECK: br i1
77 //
78 // CHECK: getelementptr inbounds {{.*}}, i64 1
79 // CHECK: icmp eq {{.*}}, i64 30
80 // CHECK: br i1
81 //
82 // CHECK: call i32 @__cxa_atexit(
83 namespace NonTrivialInit {
84   struct A { A(); A(const A&) = delete; ~A(); };
85   struct B { A a[20]; };
86   // NB, this must be large enough to be worth memsetting for this test to be
87   // meaningful.
88   B b[30] = {};
89 }
90 
91 namespace ZeroInit {
92   enum { Zero, One };
93   constexpr int zero() { return 0; }
94   constexpr int *null() { return nullptr; }
95   struct Filler {
96     int x;
97     Filler();
98   };
99   struct S1 {
100     int x;
101   };
102 
103   // These declarations, if implemented elementwise, require huge
104   // amout of memory and compiler time.
105   unsigned char data_1[1024 * 1024 * 1024 * 2u] = { 0 };
106   unsigned char data_2[1024 * 1024 * 1024 * 2u] = { Zero };
107   unsigned char data_3[1024][1024][1024] = {{{0}}};
108   unsigned char data_4[1024 * 1024 * 1024 * 2u] = { zero() };
109   int *data_5[1024 * 1024 * 512] = { nullptr };
110   int *data_6[1024 * 1024 * 512] = { null() };
111   struct S1 data_7[1024 * 1024 * 512] = {{0}};
112   char data_8[1000 * 1000 * 1000] = {};
113   int (&&data_9)[1000 * 1000 * 1000] = {0};
114   unsigned char data_10[1024 * 1024 * 1024 * 2u] = { 1 };
115   unsigned char data_11[1024 * 1024 * 1024 * 2u] = { One };
116   unsigned char data_12[1024][1024][1024] = {{{1}}};
117 
118   // This variable must be initialized elementwise.
119   Filler data_e1[1024] = {};
120   // CHECK: getelementptr inbounds {{.*}} @_ZN8ZeroInit7data_e1E
121 }
122