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