1 // RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fexceptions -fcxx-exceptions -fno-rtti | FileCheck -check-prefix WIN32 -check-prefix WIN32-O0 %s
2 // RUN: %clang_cc1 -std=c++11 -emit-llvm -O3 -disable-llvm-optzns %s -o - -triple=i386-pc-win32 -mconstructor-aliases -fexceptions -fcxx-exceptions -fno-rtti | FileCheck -check-prefix WIN32 -check-prefix WIN32-O3 -check-prefix WIN32-LIFETIME %s
3 
4 struct A {
5   A();
6   ~A();
7   int a;
8 };
9 
10 A getA();
11 
12 int TakesTwo(A a, A b);
HasEHCleanup()13 void HasEHCleanup() {
14   TakesTwo(getA(), getA());
15 }
16 
17 // With exceptions, we need to clean up at least one of these temporaries.
18 // WIN32-LABEL: define void @"\01?HasEHCleanup@@YAXXZ"() {{.*}} {
19 // WIN32:   %[[base:.*]] = call i8* @llvm.stacksave()
20 //    If this call throws, we have to restore the stack.
21 // WIN32:   call void @"\01?getA@@YA?AUA@@XZ"(%struct.A* sret %{{.*}})
22 //    If this call throws, we have to cleanup the first temporary.
23 // WIN32:   invoke void @"\01?getA@@YA?AUA@@XZ"(%struct.A* sret %{{.*}})
24 //    If this call throws, we have to cleanup the stacksave.
25 // WIN32:   call i32 @"\01?TakesTwo@@YAHUA@@0@Z"
26 // WIN32:   call void @llvm.stackrestore
27 // WIN32:   ret void
28 //
29 //    There should be one dtor call for unwinding from the second getA.
30 // WIN32:   cleanuppad
31 // WIN32:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
32 // WIN32-NOT: @"\01??1A@@QAE@XZ"
33 // WIN32: }
34 
35 void TakeRef(const A &a);
HasDeactivatedCleanups()36 int HasDeactivatedCleanups() {
37   return TakesTwo((TakeRef(A()), A()), (TakeRef(A()), A()));
38 }
39 
40 // WIN32-LABEL: define i32 @"\01?HasDeactivatedCleanups@@YAHXZ"() {{.*}} {
41 // WIN32:   %[[isactive:.*]] = alloca i1
42 // WIN32:   call i8* @llvm.stacksave()
43 // WIN32:   %[[argmem:.*]] = alloca inalloca [[argmem_ty:<{ %struct.A, %struct.A }>]]
44 // WIN32:   %[[arg1:.*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 1
45 // WIN32:   call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
46 // WIN32:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
47 //
48 // WIN32:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %[[arg1]])
49 // WIN32:   store i1 true, i1* %[[isactive]]
50 //
51 // WIN32:   %[[arg0:.*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 0
52 // WIN32:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
53 // WIN32:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
54 // WIN32:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
55 // WIN32:   store i1 false, i1* %[[isactive]]
56 //
57 // WIN32:   invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"([[argmem_ty]]* inalloca %[[argmem]])
58 //        Destroy the two const ref temporaries.
59 // WIN32:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
60 // WIN32:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
61 // WIN32:   ret i32
62 //
63 //        Conditionally destroy arg1.
64 // WIN32:   %[[cond:.*]] = load i1, i1* %[[isactive]]
65 // WIN32:   br i1 %[[cond]]
66 // WIN32:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* %[[arg1]])
67 // WIN32: }
68 
69 // Test putting the cleanups inside a conditional.
70 int CouldThrow();
HasConditionalCleanup(bool cond)71 int HasConditionalCleanup(bool cond) {
72   return (cond ? TakesTwo(A(), A()) : CouldThrow());
73 }
74 
75 // WIN32-LABEL: define i32 @"\01?HasConditionalCleanup@@YAH_N@Z"(i1 zeroext %{{.*}}) {{.*}} {
76 // WIN32:   store i1 false
77 // WIN32:   br i1
78 // WIN32:   call i8* @llvm.stacksave()
79 // WIN32:   call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %{{.*}})
80 // WIN32:   store i1 true
81 // WIN32:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %{{.*}})
82 // WIN32:   call i32 @"\01?TakesTwo@@YAHUA@@0@Z"
83 //
84 // WIN32:   call void @llvm.stackrestore
85 //
86 // WIN32:   call i32 @"\01?CouldThrow@@YAHXZ"()
87 //
88 //        Only one dtor in the invoke for arg1
89 // WIN32:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
90 // WIN32-NOT: invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
91 // WIN32: }
92 
93 // Now test both.
HasConditionalDeactivatedCleanups(bool cond)94 int HasConditionalDeactivatedCleanups(bool cond) {
95   return (cond ? TakesTwo((TakeRef(A()), A()), (TakeRef(A()), A())) : CouldThrow());
96 }
97 
98 // WIN32-O0-LABEL: define i32 @"\01?HasConditionalDeactivatedCleanups@@YAH_N@Z"{{.*}} {
99 // WIN32-O0:   alloca i1
100 // WIN32-O0:   %[[arg1_cond:.*]] = alloca i1
101 //        Start all four cleanups as deactivated.
102 // WIN32-O0:   store i1 false
103 // WIN32-O0:   store i1 false
104 // WIN32-O0:   store i1 false
105 // WIN32-O0:   store i1 false
106 // WIN32-O0:   br i1
107 //        True condition.
108 // WIN32-O0:   call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
109 // WIN32-O0:   store i1 true
110 // WIN32-O0:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
111 // WIN32-O0:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
112 // WIN32-O0:   store i1 true, i1* %[[arg1_cond]]
113 // WIN32-O0:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
114 // WIN32-O0:   store i1 true
115 // WIN32-O0:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
116 // WIN32-O0:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
117 // WIN32-O0:   store i1 true
118 // WIN32-O0:   store i1 false, i1* %[[arg1_cond]]
119 // WIN32-O0:   invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"
120 //        False condition.
121 // WIN32-O0:   invoke i32 @"\01?CouldThrow@@YAHXZ"()
122 //        Two normal cleanups for TakeRef args.
123 // WIN32-O0:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
124 // WIN32-O0-NOT:   invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
125 // WIN32-O0:   ret i32
126 //
127 //        Somewhere in the landing pad soup, we conditionally destroy arg1.
128 // WIN32-O0:   %[[isactive:.*]] = load i1, i1* %[[arg1_cond]]
129 // WIN32-O0:   br i1 %[[isactive]]
130 // WIN32-O0:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
131 // WIN32-O0: }
132 
133 // WIN32-O3-LABEL: define i32 @"\01?HasConditionalDeactivatedCleanups@@YAH_N@Z"{{.*}} {
134 // WIN32-O3:   alloca i1
135 // WIN32-O3:   alloca i1
136 // WIN32-O3:   %[[arg1_cond:.*]] = alloca i1
137 //        Start all four cleanups as deactivated.
138 // WIN32-O3:   store i1 false
139 // WIN32-O3:   store i1 false
140 // WIN32-O3:   store i1 false
141 // WIN32-O3:   store i1 false
142 // WIN32-O3:   store i1 false
143 // WIN32-O3:   store i1 false
144 // WIN32-O3:   br i1
145 //        True condition.
146 // WIN32-O3:   call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
147 // WIN32-O3:   store i1 true
148 // WIN32-O3:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
149 // WIN32-O3:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
150 // WIN32-O3:   store i1 true, i1* %[[arg1_cond]]
151 // WIN32-O3:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
152 // WIN32-O3:   store i1 true
153 // WIN32-O3:   invoke void @"\01?TakeRef@@YAXABUA@@@Z"
154 // WIN32-O3:   invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
155 // WIN32-O3:   store i1 true
156 // WIN32-O3:   store i1 false, i1* %[[arg1_cond]]
157 // WIN32-O3:   invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"
158 //        False condition.
159 // WIN32-O3:   invoke i32 @"\01?CouldThrow@@YAHXZ"()
160 //        Two normal cleanups for TakeRef args.
161 // WIN32-O3:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
162 // WIN32-O3-NOT:   invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
163 // WIN32-O3:   ret i32
164 //
165 //        Somewhere in the landing pad soup, we conditionally destroy arg1.
166 // WIN32-O3:   %[[isactive:.*]] = load i1, i1* %[[arg1_cond]]
167 // WIN32-O3:   br i1 %[[isactive]]
168 // WIN32-O3:   call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
169 // WIN32-O3: }
170 
171 namespace crash_on_partial_destroy {
172 struct A {
173   virtual ~A();
174 };
175 
176 struct B : virtual A {
177   // Has an implicit destructor.
178 };
179 
180 struct C : B {
181   C();
182 };
183 
184 void foo();
185 // We used to crash when emitting this.
C()186 C::C() { foo(); }
187 
188 // Verify that we don't bother with a vbtable lookup when adjusting the this
189 // pointer to call a base destructor from a constructor while unwinding.
190 // WIN32-LABEL: define {{.*}} @"\01??0C@crash_on_partial_destroy@@QAE@XZ"{{.*}} {
191 // WIN32:      cleanuppad
192 //
193 //        We shouldn't do any vbptr loads, just constant GEPs.
194 // WIN32-NOT:  load
195 // WIN32:      getelementptr i8, i8* %{{.*}}, i32 4
196 // WIN32-NOT:  load
197 // WIN32:      bitcast i8* %{{.*}} to %"struct.crash_on_partial_destroy::B"*
198 // WIN32:      call x86_thiscallcc void @"\01??1B@crash_on_partial_destroy@@UAE@XZ"
199 //
200 // WIN32-NOT:  load
201 // WIN32:      bitcast %"struct.crash_on_partial_destroy::C"* %{{.*}} to i8*
202 // WIN32-NOT:  load
203 // WIN32:      getelementptr inbounds i8, i8* %{{.*}}, i32 4
204 // WIN32-NOT:  load
205 // WIN32:      bitcast i8* %{{.*}} to %"struct.crash_on_partial_destroy::A"*
206 // WIN32:      call x86_thiscallcc void @"\01??1A@crash_on_partial_destroy@@UAE@XZ"({{.*}})
207 // WIN32: }
208 }
209 
210 namespace dont_call_terminate {
211 struct C {
212   ~C();
213 };
214 void g();
f()215 void f() {
216   C c;
217   g();
218 }
219 
220 // WIN32-LABEL: define void @"\01?f@dont_call_terminate@@YAXXZ"()
221 // WIN32: invoke void @"\01?g@dont_call_terminate@@YAXXZ"()
222 // WIN32-NEXT: to label %[[cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
223 //
224 // WIN32: [[cont]]
225 // WIN32: call x86_thiscallcc void @"\01??1C@dont_call_terminate@@QAE@XZ"({{.*}})
226 //
227 // WIN32: [[lpad]]
228 // WIN32-NEXT: cleanuppad
229 // WIN32: call x86_thiscallcc void @"\01??1C@dont_call_terminate@@QAE@XZ"({{.*}})
230 }
231 
232 namespace noexcept_false_dtor {
233 struct D {
234   ~D() noexcept(false);
235 };
f()236 void f() {
237   D d;
238   CouldThrow();
239 }
240 }
241 
242 // WIN32-LABEL: define void @"\01?f@noexcept_false_dtor@@YAXXZ"()
243 // WIN32: invoke i32 @"\01?CouldThrow@@YAHXZ"()
244 // WIN32: call x86_thiscallcc void @"\01??1D@noexcept_false_dtor@@QAE@XZ"(%"struct.noexcept_false_dtor::D"* %{{.*}})
245 // WIN32: cleanuppad
246 // WIN32: call x86_thiscallcc void @"\01??1D@noexcept_false_dtor@@QAE@XZ"(%"struct.noexcept_false_dtor::D"* %{{.*}})
247 // WIN32: cleanupret
248 
249 namespace lifetime_marker {
250 struct C {
251   ~C();
252 };
253 void g();
f()254 void f() {
255   C c;
256   g();
257 }
258 
259 // WIN32-LIFETIME-LABEL: define void @"\01?f@lifetime_marker@@YAXXZ"()
260 // WIN32-LIFETIME: %[[c:.*]] = alloca %"struct.lifetime_marker::C"
261 // WIN32-LIFETIME: %[[bc0:.*]] = bitcast %"struct.lifetime_marker::C"* %c to i8*
262 // WIN32-LIFETIME: call void @llvm.lifetime.start(i64 1, i8* %[[bc0]])
263 // WIN32-LIFETIME: invoke void @"\01?g@lifetime_marker@@YAXXZ"()
264 // WIN32-LIFETIME-NEXT: to label %[[cont:[^ ]*]] unwind label %[[lpad0:[^ ]*]]
265 //
266 // WIN32-LIFETIME: [[cont]]
267 // WIN32-LIFETIME: call x86_thiscallcc void @"\01??1C@lifetime_marker@@QAE@XZ"({{.*}})
268 // WIN32-LIFETIME: %[[bc1:.*]] = bitcast %"struct.lifetime_marker::C"* %[[c]] to i8*
269 // WIN32-LIFETIME: call void @llvm.lifetime.end(i64 1, i8* %[[bc1]])
270 //
271 // WIN32-LIFETIME: [[lpad0]]
272 // WIN32-LIFETIME-NEXT: cleanuppad
273 // WIN32-LIFETIME: call x86_thiscallcc void @"\01??1C@lifetime_marker@@QAE@XZ"({{.*}})
274 // WIN32-LIFETIME: cleanupret {{.*}} unwind label %[[lpad1:[^ ]*]]
275 //
276 // WIN32-LIFETIME: [[lpad1]]
277 // WIN32-LIFETIME-NEXT: cleanuppad
278 // WIN32-LIFETIME: %[[bc2:.*]] = bitcast %"struct.lifetime_marker::C"* %[[c]] to i8*
279 // WIN32-LIFETIME: call void @llvm.lifetime.end(i64 1, i8* %[[bc2]])
280 }
281