1 // RUN: %clang_cc1 %s -fno-rtti -std=c++11 -Wno-inaccessible-base -triple=i386-pc-win32 -emit-llvm -o %t
2 // RUN: FileCheck %s < %t
3 // RUN: FileCheck --check-prefix=CHECK2 %s < %t
4 
5 // For now, just make sure x86_64 doesn't crash.
6 // RUN: %clang_cc1 %s -fno-rtti -std=c++11 -Wno-inaccessible-base -triple=x86_64-pc-win32 -emit-llvm -o %t
7 
8 struct VBase {
9   virtual ~VBase();
10   virtual void foo();
11   virtual void bar();
12   int field;
13 };
14 
15 struct B : virtual VBase {
16   B();
17   virtual ~B();
18   virtual void foo();
19   virtual void bar();
20 };
21 
22 B::B() {
23   // CHECK-LABEL: define dso_local x86_thiscallcc noundef %struct.B* @"??0B@@QAE@XZ"
24   // CHECK:   %[[THIS:.*]] = load %struct.B*, %struct.B**
25   // CHECK:   br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
26 
27   // Don't check the INIT_VBASES case as it's covered by the ctor tests.
28 
29   // CHECK: %[[SKIP_VBASES]]
30   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
31   // CHECK:   %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 0
32   // ...
33   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
34   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 %{{.*}}
35   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
36   // CHECK:   store i32 (...)** bitcast ({ [3 x i8*] }* @"??_7B@@6B@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
37 
38   // Initialize vtorDisp:
39   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
40   // CHECK:   %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 0
41   // ...
42   // CHECK:   %[[VBASE_OFFSET:.*]] = add nsw i32 0, %{{.*}}
43   // CHECK:   %[[VTORDISP_VAL:.*]] = sub i32 %[[VBASE_OFFSET]], 8
44   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
45   // CHECK:   %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 %[[VBASE_OFFSET]]
46   // CHECK:   %[[VTORDISP_i8:.*]] = getelementptr i8, i8* %[[VBASE_i8]], i32 -4
47   // CHECK:   %[[VTORDISP_PTR:.*]] = bitcast i8* %[[VTORDISP_i8]] to i32*
48   // CHECK:   store i32 %[[VTORDISP_VAL]], i32* %[[VTORDISP_PTR]]
49 
50   // CHECK: ret
51 }
52 
53 B::~B() {
54   // CHECK-LABEL: define dso_local x86_thiscallcc void @"??1B@@UAE@XZ"
55   // Store initial this:
56   // CHECK:   %[[THIS_ADDR:.*]] = alloca %struct.B*
57   // CHECK:   store %struct.B* %{{.*}}, %struct.B** %[[THIS_ADDR]], align 4
58   // Reload and adjust the this parameter:
59   // CHECK:   %[[THIS_RELOAD:.*]] = load %struct.B*, %struct.B** %[[THIS_ADDR]]
60   // CHECK:   %[[THIS_UNADJ_i8:.*]] = bitcast %struct.B* %[[THIS_RELOAD]] to i8*
61   // CHECK:   %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_UNADJ_i8]], i32 -8
62   // CHECK:   %[[THIS:.*]] = bitcast i8* %[[THIS_ADJ_i8]] to %struct.B*
63 
64   // Restore the vfptr that could have been changed by a subclass.
65   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
66   // CHECK:   %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 0
67   // ...
68   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
69   // CHECK:   %[[VFPTR_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 %{{.*}}
70   // CHECK:   %[[VFPTR:.*]] = bitcast i8* %[[VFPTR_i8]] to i32 (...)***
71   // CHECK:   store i32 (...)** bitcast ({ [3 x i8*] }* @"??_7B@@6B@" to i32 (...)**), i32 (...)*** %[[VFPTR]]
72 
73   // Initialize vtorDisp:
74   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
75   // CHECK:   %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 0
76   // ...
77   // CHECK:   %[[VBASE_OFFSET:.*]] = add nsw i32 0, %{{.*}}
78   // CHECK:   %[[VTORDISP_VAL:.*]] = sub i32 %[[VBASE_OFFSET]], 8
79   // CHECK:   %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
80   // CHECK:   %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 %[[VBASE_OFFSET]]
81   // CHECK:   %[[VTORDISP_i8:.*]] = getelementptr i8, i8* %[[VBASE_i8]], i32 -4
82   // CHECK:   %[[VTORDISP_PTR:.*]] = bitcast i8* %[[VTORDISP_i8]] to i32*
83   // CHECK:   store i32 %[[VTORDISP_VAL]], i32* %[[VTORDISP_PTR]]
84 
85   foo();  // Avoid the "trivial destructor" optimization.
86 
87   // CHECK: ret
88 
89   // CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc void @"??_DB@@QAEXXZ"(%struct.B*
90   // CHECK2: %[[THIS:.*]] = load %struct.B*, %struct.B** {{.*}}
91   // CHECK2: %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
92   // CHECK2: %[[B_i8:.*]] = getelementptr i8, i8* %[[THIS_i8]], i32 8
93   // CHECK2: %[[B:.*]] = bitcast i8* %[[B_i8]] to %struct.B*
94   // CHECK2: call x86_thiscallcc void @"??1B@@UAE@XZ"(%struct.B* {{[^,]*}} %[[B]])
95   // CHECK2: %[[THIS_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
96   // CHECK2: %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_i8]], i32 8
97   // CHECK2: %[[VBASE:.*]] = bitcast i8* %[[VBASE_i8]] to %struct.VBase*
98   // CHECK2: call x86_thiscallcc void @"??1VBase@@UAE@XZ"(%struct.VBase* {{[^,]*}} %[[VBASE]])
99   // CHECK2: ret
100 
101   // CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef i8* @"??_GB@@UAEPAXI@Z"
102   // CHECK2:   store %struct.B* %{{.*}}, %struct.B** %[[THIS_ADDR:.*]], align 4
103   // CHECK2:   %[[THIS:.*]] = load %struct.B*, %struct.B** %[[THIS_ADDR]]
104   // CHECK2:   %[[THIS_PARAM_i8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
105   // CHECK2:   %[[THIS_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_PARAM_i8:.*]], i32 -8
106   // CHECK2:   %[[THIS:.*]] = bitcast i8* %[[THIS_i8]] to %struct.B*
107   // CHECK2:   call x86_thiscallcc void @"??_DB@@QAEXXZ"(%struct.B* {{[^,]*}} %[[THIS]])
108   // ...
109   // CHECK2: ret
110 }
111 
112 void B::foo() {
113 // CHECK-LABEL: define dso_local x86_thiscallcc void @"?foo@B@@UAEXXZ"(i8*
114 //
115 // B::foo gets 'this' cast to VBase* in ECX (i.e. this+8) so we
116 // need to adjust 'this' before use.
117 //
118 // Coerce this to correct type:
119 // CHECK:   %[[THIS_STORE:.*]] = alloca %struct.B*
120 // CHECK:   %[[THIS_ADDR:.*]] = alloca %struct.B*
121 // CHECK:   %[[COERCE_VAL:.*]] = bitcast i8* %{{.*}} to %struct.B*
122 // CHECK:   store %struct.B* %[[COERCE_VAL]], %struct.B** %[[THIS_STORE]], align 4
123 //
124 // Store initial this:
125 // CHECK:   %[[THIS_INIT:.*]] = load %struct.B*, %struct.B** %[[THIS_STORE]]
126 // CHECK:   store %struct.B* %[[THIS_INIT]], %struct.B** %[[THIS_ADDR]], align 4
127 //
128 // Reload and adjust the this parameter:
129 // CHECK:   %[[THIS_RELOAD:.*]] = load %struct.B*, %struct.B** %[[THIS_ADDR]]
130 // CHECK:   %[[THIS_UNADJ_i8:.*]] = bitcast %struct.B* %[[THIS_RELOAD]] to i8*
131 // CHECK:   %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_UNADJ_i8]], i32 -8
132 // CHECK:   %[[THIS:.*]] = bitcast i8* %[[THIS_ADJ_i8]] to %struct.B*
133 
134   field = 42;
135 // CHECK: %[[THIS8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
136 // CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[THIS8]], i32 0
137 // CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i32**
138 // CHECK: %[[VBTABLE:.*]] = load i32*, i32** %[[VBPTR8]]
139 // CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, i32* %[[VBTABLE]], i32 1
140 // CHECK: %[[VBOFFSET32:.*]] = load i32, i32* %[[VBENTRY]]
141 // CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
142 // CHECK: %[[THIS8:.*]] = bitcast %struct.B* %[[THIS]] to i8*
143 // CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS8]], i32 %[[VBOFFSET]]
144 // CHECK: %[[VBASE:.*]] = bitcast i8* %[[VBASE_i8]] to %struct.VBase*
145 // CHECK: %[[FIELD:.*]] = getelementptr inbounds %struct.VBase, %struct.VBase* %[[VBASE]], i32 0, i32 1
146 // CHECK: store i32 42, i32* %[[FIELD]], align 4
147 //
148 // CHECK: ret void
149 }
150 
151 void call_vbase_bar(B *obj) {
152 // CHECK-LABEL: define dso_local void @"?call_vbase_bar@@YAXPAUB@@@Z"(%struct.B* noundef %obj)
153 // CHECK: %[[OBJ:.*]] = load %struct.B
154 
155   obj->bar();
156 // When calling a vbase's virtual method, one needs to adjust 'this'
157 // at the caller site.
158 //
159 // CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
160 // CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 0
161 // CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i32**
162 // CHECK: %[[VBTABLE:.*]] = load i32*, i32** %[[VBPTR8]]
163 // CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, i32* %[[VBTABLE]], i32 1
164 // CHECK: %[[VBOFFSET32:.*]] = load i32, i32* %[[VBENTRY]]
165 // CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
166 // CHECK: %[[VBASE:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
167 //
168 // CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
169 // CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 0
170 // CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i32**
171 // CHECK: %[[VBTABLE:.*]] = load i32*, i32** %[[VBPTR8]]
172 // CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, i32* %[[VBTABLE]], i32 1
173 // CHECK: %[[VBOFFSET32:.*]] = load i32, i32* %[[VBENTRY]]
174 // CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
175 // CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
176 // CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VBASE_i8]] to void (i8*)***
177 // CHECK: %[[VFTABLE:.*]] = load void (i8*)**, void (i8*)*** %[[VFPTR]]
178 // CHECK: %[[VFUN:.*]] = getelementptr inbounds void (i8*)*, void (i8*)** %[[VFTABLE]], i64 2
179 // CHECK: %[[VFUN_VALUE:.*]] = load void (i8*)*, void (i8*)** %[[VFUN]]
180 //
181 // CHECK: call x86_thiscallcc void %[[VFUN_VALUE]](i8* noundef %[[VBASE]])
182 //
183 // CHECK: ret void
184 }
185 
186 void delete_B(B *obj) {
187 // CHECK-LABEL: define dso_local void @"?delete_B@@YAXPAUB@@@Z"(%struct.B* noundef %obj)
188 // CHECK: %[[OBJ:.*]] = load %struct.B
189 
190   delete obj;
191 // CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
192 // CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 0
193 // CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i32**
194 // CHECK: %[[VBTABLE:.*]] = load i32*, i32** %[[VBPTR8]]
195 // CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, i32* %[[VBTABLE]], i32 1
196 // CHECK: %[[VBOFFSET32:.*]] = load i32, i32* %[[VBENTRY]]
197 // CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
198 // CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
199 // CHECK: %[[VBASE:.*]] = bitcast i8* %[[VBASE_i8]] to %struct.B*
200 //
201 // CHECK: %[[OBJ_i8:.*]] = bitcast %struct.B* %[[OBJ]] to i8*
202 // CHECK: %[[VBPTR:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 0
203 // CHECK: %[[VBPTR8:.*]] = bitcast i8* %[[VBPTR]] to i32**
204 // CHECK: %[[VBTABLE:.*]] = load i32*, i32** %[[VBPTR8]]
205 // CHECK: %[[VBENTRY:.*]] = getelementptr inbounds i32, i32* %[[VBTABLE]], i32 1
206 // CHECK: %[[VBOFFSET32:.*]] = load i32, i32* %[[VBENTRY]]
207 // CHECK: %[[VBOFFSET:.*]] = add nsw i32 0, %[[VBOFFSET32]]
208 // CHECK: %[[VBASE_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 %[[VBOFFSET]]
209 // CHECK: %[[VFPTR:.*]] = bitcast i8* %[[VBASE_i8]] to i8* (%struct.B*, i32)***
210 // CHECK: %[[VFTABLE:.*]] = load i8* (%struct.B*, i32)**, i8* (%struct.B*, i32)*** %[[VFPTR]]
211 // CHECK: %[[VFUN:.*]] = getelementptr inbounds i8* (%struct.B*, i32)*, i8* (%struct.B*, i32)** %[[VFTABLE]], i64 0
212 // CHECK: %[[VFUN_VALUE:.*]] = load i8* (%struct.B*, i32)*, i8* (%struct.B*, i32)** %[[VFUN]]
213 //
214 // CHECK: call x86_thiscallcc noundef i8* %[[VFUN_VALUE]](%struct.B* {{[^,]*}} %[[VBASE]], i32 noundef 1)
215 // CHECK: ret void
216 }
217 
218 void call_complete_dtor() {
219   // CHECK-LABEL: define dso_local void @"?call_complete_dtor@@YAXXZ"
220   B b;
221   // CHECK: call x86_thiscallcc noundef %struct.B* @"??0B@@QAE@XZ"(%struct.B* {{[^,]*}} %[[B:.*]], i32 noundef 1)
222   // CHECK-NOT: getelementptr
223   // CHECK: call x86_thiscallcc void @"??_DB@@QAEXXZ"(%struct.B* {{[^,]*}} %[[B]])
224   // CHECK: ret
225 }
226 
227 struct C : B {
228   C();
229   // has an implicit vdtor.
230 };
231 
232 // Used to crash on an assertion.
233 C::C() {
234 // CHECK-LABEL: define dso_local x86_thiscallcc noundef %struct.C* @"??0C@@QAE@XZ"
235 }
236 
237 namespace multiple_vbases {
238 struct A {
239   virtual void a();
240 };
241 
242 struct B {
243   virtual void b();
244 };
245 
246 struct C {
247   virtual void c();
248 };
249 
250 struct D : virtual A, virtual B, virtual C {
251   virtual void a();
252   virtual void b();
253   virtual void c();
254   D();
255 };
256 
257 D::D() {
258   // CHECK-LABEL: define dso_local x86_thiscallcc noundef %"struct.multiple_vbases::D"* @"??0D@multiple_vbases@@QAE@XZ"
259   // Just make sure we emit 3 vtordisps after initializing vfptrs.
260   // CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7D@multiple_vbases@@6BA@1@@" to i32 (...)**), i32 (...)*** %{{.*}}
261   // CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7D@multiple_vbases@@6BB@1@@" to i32 (...)**), i32 (...)*** %{{.*}}
262   // CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7D@multiple_vbases@@6BC@1@@" to i32 (...)**), i32 (...)*** %{{.*}}
263   // ...
264   // CHECK: store i32 %{{.*}}, i32* %{{.*}}
265   // CHECK: store i32 %{{.*}}, i32* %{{.*}}
266   // CHECK: store i32 %{{.*}}, i32* %{{.*}}
267   // CHECK: ret
268 }
269 }
270 
271 namespace diamond {
272 struct A {
273   A();
274   virtual ~A();
275 };
276 
277 struct B : virtual A {
278   B();
279   ~B();
280 };
281 
282 struct C : virtual A {
283   C();
284   ~C();
285   int c1, c2, c3;
286 };
287 
288 struct Z {
289   int z;
290 };
291 
292 struct D : virtual Z, B, C {
293   D();
294   ~D();
295 } d;
296 
297 D::~D() {
298   // CHECK-LABEL: define dso_local x86_thiscallcc void @"??1D@diamond@@UAE@XZ"(%"struct.diamond::D"*{{.*}})
299   // Store initial this:
300   // CHECK: %[[THIS_ADDR:.*]] = alloca %"struct.diamond::D"*
301   // CHECK: store %"struct.diamond::D"* %{{.*}}, %"struct.diamond::D"** %[[THIS_ADDR]], align 4
302   //
303   // Reload and adjust the this parameter:
304   // CHECK: %[[THIS_RELOAD:.*]] = load %"struct.diamond::D"*, %"struct.diamond::D"** %[[THIS_ADDR]]
305   // CHECK: %[[THIS_UNADJ_i8:.*]] = bitcast %"struct.diamond::D"* %[[THIS_RELOAD]] to i8*
306   // CHECK: %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_UNADJ_i8]], i32 -24
307   // CHECK: %[[THIS:.*]] = bitcast i8* %[[THIS_ADJ_i8]] to %"struct.diamond::D"*
308   //
309   // CHECK: %[[D_i8:.*]] = bitcast %"struct.diamond::D"* %[[THIS]] to i8*
310   // CHECK: %[[C_i8:.*]] = getelementptr inbounds i8, i8* %[[D_i8]], i32 4
311   // CHECK: %[[C:.*]] = bitcast i8* %[[C_i8]] to %"struct.diamond::C"*
312   // CHECK: %[[C_i8:.*]] = bitcast %"struct.diamond::C"* %[[C]] to i8*
313   // CHECK: %[[ARG_i8:.*]] = getelementptr i8, i8* %{{.*}}, i32 16
314   // FIXME: We might consider changing the dtor this parameter type to i8*.
315   // CHECK: %[[ARG:.*]] = bitcast i8* %[[ARG_i8]] to %"struct.diamond::C"*
316   // CHECK: call x86_thiscallcc void @"??1C@diamond@@UAE@XZ"(%"struct.diamond::C"* {{[^,]*}} %[[ARG]])
317 
318   // CHECK: %[[B:.*]] = bitcast %"struct.diamond::D"* %[[THIS]] to %"struct.diamond::B"*
319   // CHECK: %[[B_i8:.*]] = bitcast %"struct.diamond::B"* %[[B]] to i8*
320   // CHECK: %[[ARG_i8:.*]] = getelementptr i8, i8* %[[B_i8]], i32 4
321   // CHECK: %[[ARG:.*]] = bitcast i8* %[[ARG_i8]] to %"struct.diamond::B"*
322   // CHECK: call x86_thiscallcc void @"??1B@diamond@@UAE@XZ"(%"struct.diamond::B"* {{[^,]*}} %[[ARG]])
323   // CHECK: ret void
324 }
325 
326 }
327 
328 namespace test2 {
329 struct A { A(); };
330 struct B : virtual A { B() {} };
331 struct C : B, A { C() {} };
332 
333 // PR18435: Order mattered here.  We were generating code for the delegating
334 // call to B() from C().
335 void callC() { C x; }
336 
337 // CHECK-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef %"struct.test2::C"* @"??0C@test2@@QAE@XZ"
338 // CHECK:           (%"struct.test2::C"* {{[^,]*}} returned %this, i32 noundef %is_most_derived)
339 // CHECK: br i1
340 //   Virtual bases
341 // CHECK: call x86_thiscallcc noundef %"struct.test2::A"* @"??0A@test2@@QAE@XZ"(%"struct.test2::A"* {{[^,]*}} %{{.*}})
342 // CHECK: br label
343 //   Non-virtual bases
344 // CHECK: call x86_thiscallcc noundef %"struct.test2::B"* @"??0B@test2@@QAE@XZ"(%"struct.test2::B"* {{[^,]*}} %{{.*}}, i32 noundef 0)
345 // CHECK: call x86_thiscallcc noundef %"struct.test2::A"* @"??0A@test2@@QAE@XZ"(%"struct.test2::A"* {{[^,]*}} %{{.*}})
346 // CHECK: ret
347 
348 // CHECK2-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef %"struct.test2::B"* @"??0B@test2@@QAE@XZ"
349 // CHECK2:           (%"struct.test2::B"* {{[^,]*}} returned %this, i32 noundef %is_most_derived)
350 // CHECK2: call x86_thiscallcc noundef %"struct.test2::A"* @"??0A@test2@@QAE@XZ"(%"struct.test2::A"* {{[^,]*}} %{{.*}})
351 // CHECK2: ret
352 
353 }
354 
355 namespace test3 {
356 // PR19104: A non-virtual call of a virtual method doesn't use vftable thunks,
357 // so requires only static adjustment which is different to the one used
358 // for virtual calls.
359 struct A {
360   virtual void foo();
361 };
362 
363 struct B : virtual A {
364   virtual void bar();
365 };
366 
367 struct C : virtual A {
368   virtual void foo();
369 };
370 
371 struct D : B, C {
372   virtual void bar();
373   int field;  // Laid out between C and A subobjects in D.
374 };
375 
376 void D::bar() {
377   // CHECK-LABEL: define dso_local x86_thiscallcc void @"?bar@D@test3@@UAEXXZ"(%"struct.test3::D"* {{[^,]*}} %this)
378 
379   C::foo();
380   // Shouldn't need any vbtable lookups.  All we have to do is adjust to C*,
381   // then compensate for the adjustment performed in the C::foo() prologue.
382   // CHECK-NOT: load i8*, i8**
383   // CHECK: %[[OBJ_i8:.*]] = bitcast %"struct.test3::D"* %{{.*}} to i8*
384   // CHECK: %[[C_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 8
385   // CHECK: %[[C:.*]] = bitcast i8* %[[C_i8]] to %"struct.test3::C"*
386   // CHECK: %[[C_i8:.*]] = bitcast %"struct.test3::C"* %[[C]] to i8*
387   // CHECK: %[[ARG:.*]] = getelementptr i8, i8* %[[C_i8]], i32 4
388   // CHECK: call x86_thiscallcc void @"?foo@C@test3@@UAEXXZ"(i8* noundef %[[ARG]])
389   // CHECK: ret
390 }
391 }
392 
393 namespace test4{
394 // PR19172: We used to merge method vftable locations wrong.
395 
396 struct A {
397   virtual ~A() {}
398 };
399 
400 struct B {
401   virtual ~B() {}
402 };
403 
404 struct C : virtual A, B {
405   virtual ~C();
406 };
407 
408 void foo(void*);
409 
410 C::~C() {
411   // CHECK-LABEL: define dso_local x86_thiscallcc void @"??1C@test4@@UAE@XZ"(%"struct.test4::C"* {{[^,]*}} %this)
412 
413   // In this case "this" points to the most derived class, so no GEPs needed.
414   // CHECK-NOT: getelementptr
415   // CHECK-NOT: bitcast
416   // CHECK: %[[VFPTR_i8:.*]] = bitcast %"struct.test4::C"* %{{.*}} to i32 (...)***
417   // CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7C@test4@@6BB@1@@" to i32 (...)**), i32 (...)*** %[[VFPTR_i8]]
418 
419   foo(this);
420   // CHECK: ret
421 }
422 
423 void destroy(C *obj) {
424   // CHECK-LABEL: define dso_local void @"?destroy@test4@@YAXPAUC@1@@Z"(%"struct.test4::C"* noundef %obj)
425 
426   delete obj;
427   // CHECK: %[[VPTR:.*]] = bitcast %"struct.test4::C"* %[[OBJ:.*]] to i8* (%"struct.test4::C"*, i32)***
428   // CHECK: %[[VFTABLE:.*]] = load i8* (%"struct.test4::C"*, i32)**, i8* (%"struct.test4::C"*, i32)*** %[[VPTR]]
429   // CHECK: %[[VFTENTRY:.*]] = getelementptr inbounds i8* (%"struct.test4::C"*, i32)*, i8* (%"struct.test4::C"*, i32)** %[[VFTABLE]], i64 0
430   // CHECK: %[[VFUN:.*]] = load i8* (%"struct.test4::C"*, i32)*, i8* (%"struct.test4::C"*, i32)** %[[VFTENTRY]]
431   // CHECK: call x86_thiscallcc noundef i8* %[[VFUN]](%"struct.test4::C"* {{[^,]*}} %[[OBJ]], i32 noundef 1)
432   // CHECK: ret
433 }
434 
435 struct D {
436   virtual void d();
437 };
438 
439 // The first non-virtual base doesn't have a vdtor,
440 // but "this adjustment" is not needed.
441 struct E : D, B, virtual A {
442   virtual ~E();
443 };
444 
445 E::~E() {
446   // CHECK-LABEL: define dso_local x86_thiscallcc void @"??1E@test4@@UAE@XZ"(%"struct.test4::E"* {{[^,]*}} %this)
447 
448   // In this case "this" points to the most derived class, so no GEPs needed.
449   // CHECK-NOT: getelementptr
450   // CHECK-NOT: bitcast
451   // CHECK: %[[VFPTR_i8:.*]] = bitcast %"struct.test4::E"* %{{.*}} to i32 (...)***
452   // CHECK: store i32 (...)** bitcast ({ [1 x i8*] }* @"??_7E@test4@@6BD@1@@" to i32 (...)**), i32 (...)*** %[[VFPTR_i8]]
453   foo(this);
454 }
455 
456 void destroy(E *obj) {
457   // CHECK-LABEL: define dso_local void @"?destroy@test4@@YAXPAUE@1@@Z"(%"struct.test4::E"* noundef %obj)
458 
459   // CHECK-NOT: getelementptr
460   // CHECK: %[[OBJ_i8:.*]] = bitcast %"struct.test4::E"* %[[OBJ]] to i8*
461   // CHECK: %[[B_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 4
462   // FIXME: in fact, the call should take i8* and the bitcast is redundant.
463   // CHECK: %[[B_as_E:.*]] = bitcast i8* %[[B_i8]] to %"struct.test4::E"*
464   // CHECK: %[[OBJ_i8:.*]] = bitcast %"struct.test4::E"* %[[OBJ:.*]] to i8*
465   // CHECK: %[[B_i8:.*]] = getelementptr inbounds i8, i8* %[[OBJ_i8]], i32 4
466   // CHECK: %[[VPTR:.*]] = bitcast i8* %[[B_i8]] to i8* (%"struct.test4::E"*, i32)***
467   // CHECK: %[[VFTABLE:.*]] = load i8* (%"struct.test4::E"*, i32)**, i8* (%"struct.test4::E"*, i32)*** %[[VPTR]]
468   // CHECK: %[[VFTENTRY:.*]] = getelementptr inbounds i8* (%"struct.test4::E"*, i32)*, i8* (%"struct.test4::E"*, i32)** %[[VFTABLE]], i64 0
469   // CHECK: %[[VFUN:.*]] = load i8* (%"struct.test4::E"*, i32)*, i8* (%"struct.test4::E"*, i32)** %[[VFTENTRY]]
470   // CHECK: call x86_thiscallcc noundef i8* %[[VFUN]](%"struct.test4::E"* {{[^,]*}} %[[B_as_E]], i32 noundef 1)
471   delete obj;
472 }
473 
474 }
475 
476 namespace test5 {
477 // PR25370: Don't zero-initialize vbptrs in virtual bases.
478 struct A {
479   virtual void f();
480 };
481 
482 struct B : virtual A {
483   int Field;
484 };
485 
486 struct C : B {
487   C();
488 };
489 
490 C::C() : B() {}
491 // CHECK-LABEL: define dso_local x86_thiscallcc noundef %"struct.test5::C"* @"??0C@test5@@QAE@XZ"(
492 // CHECK:   %[[THIS:.*]] = load %"struct.test5::C"*, %"struct.test5::C"**
493 // CHECK:   br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
494 
495 // CHECK: %[[SKIP_VBASES]]
496 // CHECK:   %[[B:.*]] = bitcast %"struct.test5::C"* %[[THIS]] to %"struct.test5::B"*
497 // CHECK:   %[[B_i8:.*]] = bitcast %"struct.test5::B"* %[[B]] to i8*
498 // CHECK:   %[[FIELD:.*]] = getelementptr inbounds i8, i8* %[[B_i8]], i32 4
499 // CHECK:   call void @llvm.memset.p0i8.i32(i8* align 4 %[[FIELD]], i8 0, i32 4, i1 false)
500 }
501 
502 namespace pr27621 {
503 // Devirtualization through a static_cast used to make us compute the 'this'
504 // adjustment for B::g instead of C::g. When we directly call C::g, 'this' is a
505 // B*, and the prologue of C::g will adjust it to a C*.
506 struct A { virtual void f(); };
507 struct B { virtual void g(); };
508 struct C final : A, B {
509   virtual void h();
510   void g() override;
511 };
512 void callit(C *p) {
513   static_cast<B*>(p)->g();
514 }
515 // CHECK-LABEL: define dso_local void @"?callit@pr27621@@YAXPAUC@1@@Z"(%"struct.pr27621::C"* noundef %{{.*}})
516 // CHECK: %[[B_i8:.*]] = getelementptr i8, i8* %{{.*}}, i32 4
517 // CHECK: call x86_thiscallcc void @"?g@C@pr27621@@UAEXXZ"(i8* noundef %[[B_i8]])
518 }
519 
520 namespace test6 {
521 class A {};
522 class B : virtual A {};
523 class C : virtual B {
524   virtual void m_fn1();
525   float field;
526 };
527 class D : C {
528   D();
529 };
530 D::D() : C() {}
531 // CHECK-LABEL: define dso_local x86_thiscallcc noundef %"class.test6::D"* @"??0D@test6@@AAE@XZ"(
532 // CHECK:   %[[THIS:.*]] = load %"class.test6::D"*, %"class.test6::D"**
533 // CHECK:   br i1 %{{.*}}, label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
534 
535 // CHECK: %[[SKIP_VBASES]]
536 // CHECK:   %[[C:.*]] = bitcast %"class.test6::D"* %[[THIS]] to %"class.test6::C"*
537 // CHECK:   %[[C_i8:.*]] = bitcast %"class.test6::C"* %[[C]] to i8*
538 // CHECK:   %[[FIELD:.*]] = getelementptr inbounds i8, i8* %[[C_i8]], i32 8
539 // CHECK:   call void @llvm.memset.p0i8.i32(i8* align 4 %[[FIELD]], i8 0, i32 4, i1 false)
540 }
541 
542 namespace pr36921 {
543 struct A {
544   virtual ~A() {}
545 };
546 struct B {
547   virtual ~B() {}
548 };
549 struct C : virtual B {};
550 struct D : virtual A, C {};
551 D d;
552 // CHECK-LABEL: define linkonce_odr dso_local x86_thiscallcc noundef i8* @"??_GD@pr36921@@UAEPAXI@Z"(
553 // CHECK:   %[[THIS:.*]] = load %"struct.pr36921::D"*, %"struct.pr36921::D"**
554 // CHECK:   %[[THIS_UNADJ_i8:.*]] = bitcast %"struct.pr36921::D"* %[[THIS_RELOAD]] to i8*
555 // CHECK:   %[[THIS_ADJ_i8:.*]] = getelementptr inbounds i8, i8* %[[THIS_UNADJ_i8]], i32 -4
556 // CHECK:   %[[THIS:.*]] = bitcast i8* %[[THIS_ADJ_i8]] to %"struct.pr36921::D"*
557 }
558