1 // RUN: %clang_cc1 -emit-llvm %s -o - -mconstructor-aliases -cxx-abi microsoft -triple=i386-pc-win32 -fno-rtti > %t
2 // RUN: FileCheck %s < %t
3 // vftables are emitted very late, so do another pass to try to keep the checks
4 // in source order.
5 // RUN: FileCheck --check-prefix DTORS %s < %t
6 //
7 // RUN: %clang_cc1 -emit-llvm %s -o - -mconstructor-aliases -cxx-abi microsoft -triple=x86_64-pc-win32 -fno-rtti | FileCheck --check-prefix DTORS-X64 %s
8 
9 namespace basic {
10 
11 class A {
12  public:
13   A() { }
14   ~A();
15 };
16 
17 void no_constructor_destructor_infinite_recursion() {
18   A a;
19 
20 // CHECK:      define linkonce_odr x86_thiscallcc %"class.basic::A"* @"\01??0A@basic@@QAE@XZ"(%"class.basic::A"* returned %this)
21 // CHECK:        [[THIS_ADDR:%[.0-9A-Z_a-z]+]] = alloca %"class.basic::A"*, align 4
22 // CHECK-NEXT:   store %"class.basic::A"* %this, %"class.basic::A"** [[THIS_ADDR]], align 4
23 // CHECK-NEXT:   [[T1:%[.0-9A-Z_a-z]+]] = load %"class.basic::A"** [[THIS_ADDR]]
24 // CHECK-NEXT:   ret %"class.basic::A"* [[T1]]
25 // CHECK-NEXT: }
26 }
27 
28 A::~A() {
29 // Make sure that the destructor doesn't call itself:
30 // CHECK: define {{.*}} @"\01??1A@basic@@QAE@XZ"
31 // CHECK-NOT: call void @"\01??1A@basic@@QAE@XZ"
32 // CHECK: ret
33 }
34 
35 struct B {
36   B();
37 };
38 
39 // Tests that we can define constructors outside the class (PR12784).
40 B::B() {
41   // CHECK: define x86_thiscallcc %"struct.basic::B"* @"\01??0B@basic@@QAE@XZ"(%"struct.basic::B"* returned %this)
42   // CHECK: ret
43 }
44 
45 struct C {
46   virtual ~C() {
47 // DTORS:      define linkonce_odr x86_thiscallcc void @"\01??_GC@basic@@UAEPAXI@Z"(%"struct.basic::C"* %this, i32 %should_call_delete)
48 // DTORS:        store i32 %should_call_delete, i32* %[[SHOULD_DELETE_VAR:[0-9a-z._]+]], align 4
49 // DTORS:        %[[SHOULD_DELETE_VALUE:[0-9a-z._]+]] = load i32* %[[SHOULD_DELETE_VAR]]
50 // DTORS:        call x86_thiscallcc void @"\01??1C@basic@@UAE@XZ"(%"struct.basic::C"* %[[THIS:[0-9a-z]+]])
51 // DTORS-NEXT:   %[[CONDITION:[0-9]+]] = icmp eq i32 %[[SHOULD_DELETE_VALUE]], 0
52 // DTORS-NEXT:   br i1 %[[CONDITION]], label %[[CONTINUE_LABEL:[0-9a-z._]+]], label %[[CALL_DELETE_LABEL:[0-9a-z._]+]]
53 //
54 // DTORS:      [[CALL_DELETE_LABEL]]
55 // DTORS-NEXT:   %[[THIS_AS_VOID:[0-9a-z]+]] = bitcast %"struct.basic::C"* %[[THIS]] to i8*
56 // DTORS-NEXT:   call void @"\01??3@YAXPAX@Z"(i8* %[[THIS_AS_VOID]])
57 // DTORS-NEXT:   br label %[[CONTINUE_LABEL]]
58 //
59 // DTORS:      [[CONTINUE_LABEL]]
60 // DTORS-NEXT:   ret void
61 
62 // Check that we do the mangling correctly on x64.
63 // DTORS-X64:  @"\01??_GC@basic@@UEAAPEAXI@Z"
64   }
65   virtual void foo();
66 };
67 
68 // Emits the vftable in the output.
69 void C::foo() {}
70 
71 void check_vftable_offset() {
72   C c;
73 // The vftable pointer should point at the beginning of the vftable.
74 // CHECK: [[THIS_PTR:%[0-9]+]] = bitcast %"struct.basic::C"* {{.*}} to [2 x i8*]**
75 // CHECK: store [2 x i8*]* @"\01??_7C@basic@@6B@", [2 x i8*]** [[THIS_PTR]]
76 }
77 
78 void call_complete_dtor(C *obj_ptr) {
79 // CHECK: define void @"\01?call_complete_dtor@basic@@YAXPAUC@1@@Z"(%"struct.basic::C"* %obj_ptr)
80   obj_ptr->~C();
81 // CHECK: %[[OBJ_PTR_VALUE:.*]] = load %"struct.basic::C"** %{{.*}}, align 4
82 // CHECK-NEXT: %[[PVTABLE:.*]] = bitcast %"struct.basic::C"* %[[OBJ_PTR_VALUE]] to void (%"struct.basic::C"*, i32)***
83 // CHECK-NEXT: %[[VTABLE:.*]] = load void (%"struct.basic::C"*, i32)*** %[[PVTABLE]]
84 // CHECK-NEXT: %[[PVDTOR:.*]] = getelementptr inbounds void (%"struct.basic::C"*, i32)** %[[VTABLE]], i64 0
85 // CHECK-NEXT: %[[VDTOR:.*]] = load void (%"struct.basic::C"*, i32)** %[[PVDTOR]]
86 // CHECK-NEXT: call x86_thiscallcc void %[[VDTOR]](%"struct.basic::C"* %[[OBJ_PTR_VALUE]], i32 0)
87 // CHECK-NEXT: ret void
88 }
89 
90 void call_deleting_dtor(C *obj_ptr) {
91 // CHECK: define void @"\01?call_deleting_dtor@basic@@YAXPAUC@1@@Z"(%"struct.basic::C"* %obj_ptr)
92   delete obj_ptr;
93 // CHECK:      %[[OBJ_PTR_VALUE:.*]] = load %"struct.basic::C"** %{{.*}}, align 4
94 // CHECK:      br i1 {{.*}}, label %[[DELETE_NULL:.*]], label %[[DELETE_NOTNULL:.*]]
95 
96 // CHECK:      [[DELETE_NOTNULL]]
97 // CHECK-NEXT:   %[[PVTABLE:.*]] = bitcast %"struct.basic::C"* %[[OBJ_PTR_VALUE]] to void (%"struct.basic::C"*, i32)***
98 // CHECK-NEXT:   %[[VTABLE:.*]] = load void (%"struct.basic::C"*, i32)*** %[[PVTABLE]]
99 // CHECK-NEXT:   %[[PVDTOR:.*]] = getelementptr inbounds void (%"struct.basic::C"*, i32)** %[[VTABLE]], i64 0
100 // CHECK-NEXT:   %[[VDTOR:.*]] = load void (%"struct.basic::C"*, i32)** %[[PVDTOR]]
101 // CHECK-NEXT:   call x86_thiscallcc void %[[VDTOR]](%"struct.basic::C"* %[[OBJ_PTR_VALUE]], i32 1)
102 // CHECK:      ret void
103 }
104 
105 struct D {
106   static int foo();
107 
108   D() {
109     static int ctor_static = foo();
110     // CHECK that the static in the ctor gets mangled correctly:
111     // CHECK: @"\01?ctor_static@?1???0D@basic@@QAE@XZ@4HA"
112   }
113   ~D() {
114     static int dtor_static = foo();
115     // CHECK that the static in the dtor gets mangled correctly:
116     // CHECK: @"\01?dtor_static@?1???1D@basic@@QAE@XZ@4HA"
117   }
118 };
119 
120 void use_D() { D c; }
121 
122 } // end namespace basic
123 
124 
125 namespace constructors {
126 
127 struct A {
128   A() {}
129 };
130 
131 struct B : A {
132   B();
133   ~B();
134 };
135 
136 B::B() {
137   // CHECK: define x86_thiscallcc %"struct.constructors::B"* @"\01??0B@constructors@@QAE@XZ"(%"struct.constructors::B"* returned %this)
138   // CHECK: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
139   // CHECK: ret
140 }
141 
142 struct C : virtual A {
143   C();
144 };
145 
146 C::C() {
147   // CHECK: define x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* returned %this, i32 %is_most_derived)
148   // TODO: make sure this works in the Release build too;
149   // CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
150   // CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
151   // CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
152   // CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
153   //
154   // CHECK: [[INIT_VBASES]]
155   // CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::C"* %{{.*}} to i8*
156   // CHECK-NEXT: %[[vbptr_off:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
157   // CHECK-NEXT: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to [2 x i32]**
158   // CHECK-NEXT: store [2 x i32]* @"\01??_8C@constructors@@7B@", [2 x i32]** %[[vbptr]]
159   // CHECK-NEXT: bitcast %"struct.constructors::C"* %{{.*}} to i8*
160   // CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
161   // CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
162   // CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
163   // CHECK-NEXT: br label %[[SKIP_VBASES]]
164   //
165   // CHECK: [[SKIP_VBASES]]
166   // Class C does not define or override methods, so shouldn't change the vfptr.
167   // CHECK-NOT: @"\01??_7C@constructors@@6B@"
168   // CHECK: ret
169 }
170 
171 void create_C() {
172   C c;
173   // CHECK: define void @"\01?create_C@constructors@@YAXXZ"()
174   // CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %c, i32 1)
175   // CHECK: ret
176 }
177 
178 struct D : C {
179   D();
180 };
181 
182 D::D() {
183   // CHECK: define x86_thiscallcc %"struct.constructors::D"* @"\01??0D@constructors@@QAE@XZ"(%"struct.constructors::D"* returned %this, i32 %is_most_derived) unnamed_addr
184   // CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
185   // CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
186   // CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
187   // CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
188   //
189   // CHECK: [[INIT_VBASES]]
190   // CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::D"* %{{.*}} to i8*
191   // CHECK-NEXT: %[[vbptr_off:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
192   // CHECK-NEXT: %[[vbptr:.*]] = bitcast i8* %[[vbptr_off]] to [2 x i32]**
193   // CHECK-NEXT: store [2 x i32]* @"\01??_8D@constructors@@7B@", [2 x i32]** %[[vbptr]]
194   // CHECK-NEXT: bitcast %"struct.constructors::D"* %{{.*}} to i8*
195   // CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
196   // CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
197   // CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
198   // CHECK-NEXT: br label %[[SKIP_VBASES]]
199   //
200   // CHECK: [[SKIP_VBASES]]
201   // CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %{{.*}}, i32 0)
202   // CHECK: ret
203 }
204 
205 struct E : virtual C {
206   E();
207 };
208 
209 E::E() {
210   // CHECK: define x86_thiscallcc %"struct.constructors::E"* @"\01??0E@constructors@@QAE@XZ"(%"struct.constructors::E"* returned %this, i32 %is_most_derived) unnamed_addr
211   // CHECK: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
212   // CHECK: %[[IS_MOST_DERIVED_VAL:.*]] = load i32* %[[IS_MOST_DERIVED_VAR]]
213   // CHECK: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
214   // CHECK: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
215   //
216   // CHECK: [[INIT_VBASES]]
217   // CHECK-NEXT: %[[this_i8:.*]] = bitcast %"struct.constructors::E"* %{{.*}} to i8*
218   // CHECK-NEXT: %[[offs:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 0
219   // CHECK-NEXT: %[[vbptr_E:.*]] = bitcast i8* %[[offs]] to [3 x i32]**
220   // CHECK-NEXT: store [3 x i32]* @"\01??_8E@constructors@@7B01@@", [3 x i32]** %[[vbptr_E]]
221   // CHECK-NEXT: %[[offs:.*]] = getelementptr inbounds i8* %[[this_i8]], i64 4
222   // CHECK-NEXT: %[[vbptr_C:.*]] = bitcast i8* %[[offs]] to [2 x i32]**
223   // CHECK-NEXT: store [2 x i32]* @"\01??_8E@constructors@@7BC@1@@", [2 x i32]** %[[vbptr_C]]
224   // CHECK-NEXT: bitcast %"struct.constructors::E"* %{{.*}} to i8*
225   // CHECK-NEXT: getelementptr inbounds i8* %{{.*}}, i64 4
226   // CHECK-NEXT: bitcast i8* %{{.*}} to %"struct.constructors::A"*
227   // CHECK-NEXT: call x86_thiscallcc %"struct.constructors::A"* @"\01??0A@constructors@@QAE@XZ"(%"struct.constructors::A"* %{{.*}})
228   // CHECK: call x86_thiscallcc %"struct.constructors::C"* @"\01??0C@constructors@@QAE@XZ"(%"struct.constructors::C"* %{{.*}}, i32 0)
229   // CHECK-NEXT: br label %[[SKIP_VBASES]]
230   //
231   // CHECK: [[SKIP_VBASES]]
232   // CHECK: ret
233 }
234 
235 // PR16735 - even abstract classes should have a constructor emitted.
236 struct F {
237   F();
238   virtual void f() = 0;
239 };
240 
241 F::F() {}
242 // CHECK: define x86_thiscallcc %"struct.constructors::F"* @"\01??0F@constructors@@QAE@XZ"
243 
244 } // end namespace constructors
245 
246 namespace dtors {
247 
248 struct A {
249   ~A();
250 };
251 
252 void call_nv_complete(A *a) {
253   a->~A();
254 // CHECK: define void @"\01?call_nv_complete@dtors@@YAXPAUA@1@@Z"
255 // CHECK: call x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
256 // CHECK: ret
257 }
258 
259 // CHECK: declare x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
260 
261 // Now try some virtual bases, where we need the complete dtor.
262 
263 struct B : virtual A { ~B(); };
264 struct C : virtual A { ~C(); };
265 struct D : B, C { ~D(); };
266 
267 void call_vbase_complete(D *d) {
268   d->~D();
269 // CHECK: define void @"\01?call_vbase_complete@dtors@@YAXPAUD@1@@Z"
270 // CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
271 // CHECK: ret
272 }
273 
274 // The complete dtor should call the base dtors for D and the vbase A (once).
275 // CHECK: define linkonce_odr x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"
276 // CHECK-NOT: call
277 // CHECK: call x86_thiscallcc void @"\01??1D@dtors@@QAE@XZ"
278 // CHECK-NOT: call
279 // CHECK: call x86_thiscallcc void @"\01??1A@dtors@@QAE@XZ"
280 // CHECK-NOT: call
281 // CHECK: ret
282 
283 void destroy_d_complete() {
284   D d;
285 // CHECK: define void @"\01?destroy_d_complete@dtors@@YAXXZ"
286 // CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
287 // CHECK: ret
288 }
289 
290 // FIXME: Clang manually inlines the deletion, so we don't get a call to the
291 // deleting dtor (_G).  The only way to call deleting dtors currently is through
292 // a vftable.
293 void call_nv_deleting_dtor(D *d) {
294   delete d;
295 // CHECK: define void @"\01?call_nv_deleting_dtor@dtors@@YAXPAUD@1@@Z"
296 // CHECK: call x86_thiscallcc void @"\01??_DD@dtors@@QAE@XZ"(%"struct.dtors::D"* %{{[^,]+}})
297 // CHECK: call void @"\01??3@YAXPAX@Z"
298 // CHECK: ret
299 }
300 
301 }
302