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
302
303
304
305
306
307
308
309
310
311
312
313
314
315
|
// 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
// RUN: %clang_cc1 -std=c++11 -emit-llvm -O3 -disable-llvm-passes %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
struct A {
A();
~A();
int a;
};
A getA();
int TakesTwo(A a, A b);
void HasEHCleanup() {
TakesTwo(getA(), getA());
}
// With exceptions, we need to clean up at least one of these temporaries.
// WIN32-LABEL: define void @"\01?HasEHCleanup@@YAXXZ"() {{.*}} {
// WIN32: %[[base:.*]] = call i8* @llvm.stacksave()
// If this call throws, we have to restore the stack.
// WIN32: call void @"\01?getA@@YA?AUA@@XZ"(%struct.A* sret %{{.*}})
// If this call throws, we have to cleanup the first temporary.
// WIN32: invoke void @"\01?getA@@YA?AUA@@XZ"(%struct.A* sret %{{.*}})
// If this call throws, we have to cleanup the stacksave.
// WIN32: call i32 @"\01?TakesTwo@@YAHUA@@0@Z"
// WIN32: call void @llvm.stackrestore
// WIN32: ret void
//
// There should be one dtor call for unwinding from the second getA.
// WIN32: cleanuppad
// WIN32: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-NOT: @"\01??1A@@QAE@XZ"
// WIN32: }
void TakeRef(const A &a);
int HasDeactivatedCleanups() {
return TakesTwo((TakeRef(A()), A()), (TakeRef(A()), A()));
}
// WIN32-LABEL: define i32 @"\01?HasDeactivatedCleanups@@YAHXZ"() {{.*}} {
// WIN32: %[[isactive:.*]] = alloca i1
// WIN32: call i8* @llvm.stacksave()
// WIN32: %[[argmem:.*]] = alloca inalloca [[argmem_ty:<{ %struct.A, %struct.A }>]]
// WIN32: %[[arg1:.*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 1
// WIN32: call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
//
// WIN32: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %[[arg1]])
// WIN32: store i1 true, i1* %[[isactive]]
//
// WIN32: %[[arg0:.*]] = getelementptr inbounds [[argmem_ty]], [[argmem_ty]]* %[[argmem]], i32 0, i32 0
// WIN32: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
// WIN32: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32: store i1 false, i1* %[[isactive]]
//
// WIN32: invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"([[argmem_ty]]* inalloca %[[argmem]])
// Destroy the two const ref temporaries.
// WIN32: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32: ret i32
//
// Conditionally destroy arg1.
// WIN32: %[[cond:.*]] = load i1, i1* %[[isactive]]
// WIN32: br i1 %[[cond]]
// WIN32: call x86_thiscallcc void @"\01??1A@@QAE@XZ"(%struct.A* %[[arg1]])
// WIN32: }
// Test putting the cleanups inside a conditional.
int CouldThrow();
int HasConditionalCleanup(bool cond) {
return (cond ? TakesTwo(A(), A()) : CouldThrow());
}
// WIN32-LABEL: define i32 @"\01?HasConditionalCleanup@@YAH_N@Z"(i1 zeroext %{{.*}}) {{.*}} {
// WIN32: store i1 false
// WIN32: br i1
// WIN32: call i8* @llvm.stacksave()
// WIN32: call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %{{.*}})
// WIN32: store i1 true
// WIN32: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"(%struct.A* %{{.*}})
// WIN32: call i32 @"\01?TakesTwo@@YAHUA@@0@Z"
//
// WIN32: call void @llvm.stackrestore
//
// WIN32: call i32 @"\01?CouldThrow@@YAHXZ"()
//
// Only one dtor in the invoke for arg1
// WIN32: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-NOT: invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
// WIN32: }
// Now test both.
int HasConditionalDeactivatedCleanups(bool cond) {
return (cond ? TakesTwo((TakeRef(A()), A()), (TakeRef(A()), A())) : CouldThrow());
}
// WIN32-O0-LABEL: define i32 @"\01?HasConditionalDeactivatedCleanups@@YAH_N@Z"{{.*}} {
// WIN32-O0: alloca i1
// WIN32-O0: %[[arg1_cond:.*]] = alloca i1
// Start all four cleanups as deactivated.
// WIN32-O0: store i1 false
// WIN32-O0: store i1 false
// WIN32-O0: store i1 false
// WIN32-O0: store i1 false
// WIN32-O0: br i1
// True condition.
// WIN32-O0: call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O0: store i1 true
// WIN32-O0: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
// WIN32-O0: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O0: store i1 true, i1* %[[arg1_cond]]
// WIN32-O0: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O0: store i1 true
// WIN32-O0: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
// WIN32-O0: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O0: store i1 true
// WIN32-O0: store i1 false, i1* %[[arg1_cond]]
// WIN32-O0: invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"
// False condition.
// WIN32-O0: invoke i32 @"\01?CouldThrow@@YAHXZ"()
// Two normal cleanups for TakeRef args.
// WIN32-O0: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-O0-NOT: invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
// WIN32-O0: ret i32
//
// Somewhere in the landing pad soup, we conditionally destroy arg1.
// WIN32-O0: %[[isactive:.*]] = load i1, i1* %[[arg1_cond]]
// WIN32-O0: br i1 %[[isactive]]
// WIN32-O0: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-O0: }
// WIN32-O3-LABEL: define i32 @"\01?HasConditionalDeactivatedCleanups@@YAH_N@Z"{{.*}} {
// WIN32-O3: alloca i1
// WIN32-O3: alloca i1
// WIN32-O3: %[[arg1_cond:.*]] = alloca i1
// Start all four cleanups as deactivated.
// WIN32-O3: store i1 false
// WIN32-O3: store i1 false
// WIN32-O3: store i1 false
// WIN32-O3: store i1 false
// WIN32-O3: store i1 false
// WIN32-O3: store i1 false
// WIN32-O3: br i1
// True condition.
// WIN32-O3: call x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O3: store i1 true
// WIN32-O3: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
// WIN32-O3: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O3: store i1 true, i1* %[[arg1_cond]]
// WIN32-O3: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O3: store i1 true
// WIN32-O3: invoke void @"\01?TakeRef@@YAXABUA@@@Z"
// WIN32-O3: invoke x86_thiscallcc %struct.A* @"\01??0A@@QAE@XZ"
// WIN32-O3: store i1 true
// WIN32-O3: store i1 false, i1* %[[arg1_cond]]
// WIN32-O3: invoke i32 @"\01?TakesTwo@@YAHUA@@0@Z"
// False condition.
// WIN32-O3: invoke i32 @"\01?CouldThrow@@YAHXZ"()
// Two normal cleanups for TakeRef args.
// WIN32-O3: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-O3-NOT: invoke x86_thiscallcc void @"\01??1A@@QAE@XZ"
// WIN32-O3: ret i32
//
// Somewhere in the landing pad soup, we conditionally destroy arg1.
// WIN32-O3: %[[isactive:.*]] = load i1, i1* %[[arg1_cond]]
// WIN32-O3: br i1 %[[isactive]]
// WIN32-O3: call x86_thiscallcc void @"\01??1A@@QAE@XZ"({{.*}})
// WIN32-O3: }
namespace crash_on_partial_destroy {
struct A {
virtual ~A();
};
struct B : virtual A {
// Has an implicit destructor.
};
struct C : B {
C();
};
void foo();
// We used to crash when emitting this.
C::C() { foo(); }
// Verify that we don't bother with a vbtable lookup when adjusting the this
// pointer to call a base destructor from a constructor while unwinding.
// WIN32-LABEL: define {{.*}} @"\01??0C@crash_on_partial_destroy@@QAE@XZ"{{.*}} {
// WIN32: cleanuppad
//
// We shouldn't do any vbptr loads, just constant GEPs.
// WIN32-NOT: load
// WIN32: getelementptr i8, i8* %{{.*}}, i32 4
// WIN32-NOT: load
// WIN32: bitcast i8* %{{.*}} to %"struct.crash_on_partial_destroy::B"*
// WIN32: call x86_thiscallcc void @"\01??1B@crash_on_partial_destroy@@UAE@XZ"
//
// WIN32-NOT: load
// WIN32: bitcast %"struct.crash_on_partial_destroy::C"* %{{.*}} to i8*
// WIN32-NOT: load
// WIN32: getelementptr inbounds i8, i8* %{{.*}}, i32 4
// WIN32-NOT: load
// WIN32: bitcast i8* %{{.*}} to %"struct.crash_on_partial_destroy::A"*
// WIN32: call x86_thiscallcc void @"\01??1A@crash_on_partial_destroy@@UAE@XZ"({{.*}})
// WIN32: }
}
namespace dont_call_terminate {
struct C {
~C();
};
void g();
void f() {
C c;
g();
}
// WIN32-LABEL: define void @"\01?f@dont_call_terminate@@YAXXZ"()
// WIN32: invoke void @"\01?g@dont_call_terminate@@YAXXZ"()
// WIN32-NEXT: to label %[[cont:[^ ]*]] unwind label %[[lpad:[^ ]*]]
//
// WIN32: [[cont]]
// WIN32: call x86_thiscallcc void @"\01??1C@dont_call_terminate@@QAE@XZ"({{.*}})
//
// WIN32: [[lpad]]
// WIN32-NEXT: cleanuppad
// WIN32: call x86_thiscallcc void @"\01??1C@dont_call_terminate@@QAE@XZ"({{.*}})
}
namespace noexcept_false_dtor {
struct D {
~D() noexcept(false);
};
void f() {
D d;
CouldThrow();
}
}
// WIN32-LABEL: define void @"\01?f@noexcept_false_dtor@@YAXXZ"()
// WIN32: invoke i32 @"\01?CouldThrow@@YAHXZ"()
// WIN32: call x86_thiscallcc void @"\01??1D@noexcept_false_dtor@@QAE@XZ"(%"struct.noexcept_false_dtor::D"* %{{.*}})
// WIN32: cleanuppad
// WIN32: call x86_thiscallcc void @"\01??1D@noexcept_false_dtor@@QAE@XZ"(%"struct.noexcept_false_dtor::D"* %{{.*}})
// WIN32: cleanupret
namespace lifetime_marker {
struct C {
~C();
};
void g();
void f() {
C c;
g();
}
// WIN32-LIFETIME-LABEL: define void @"\01?f@lifetime_marker@@YAXXZ"()
// WIN32-LIFETIME: %[[c:.*]] = alloca %"struct.lifetime_marker::C"
// WIN32-LIFETIME: %[[bc0:.*]] = bitcast %"struct.lifetime_marker::C"* %c to i8*
// WIN32-LIFETIME: call void @llvm.lifetime.start.p0i8(i64 1, i8* %[[bc0]])
// WIN32-LIFETIME: invoke void @"\01?g@lifetime_marker@@YAXXZ"()
// WIN32-LIFETIME-NEXT: to label %[[cont:[^ ]*]] unwind label %[[lpad0:[^ ]*]]
//
// WIN32-LIFETIME: [[cont]]
// WIN32-LIFETIME: call x86_thiscallcc void @"\01??1C@lifetime_marker@@QAE@XZ"({{.*}})
// WIN32-LIFETIME: %[[bc1:.*]] = bitcast %"struct.lifetime_marker::C"* %[[c]] to i8*
// WIN32-LIFETIME: call void @llvm.lifetime.end.p0i8(i64 1, i8* %[[bc1]])
//
// WIN32-LIFETIME: [[lpad0]]
// WIN32-LIFETIME-NEXT: cleanuppad
// WIN32-LIFETIME: call x86_thiscallcc void @"\01??1C@lifetime_marker@@QAE@XZ"({{.*}})
// WIN32-LIFETIME: cleanupret {{.*}} unwind label %[[lpad1:[^ ]*]]
//
// WIN32-LIFETIME: [[lpad1]]
// WIN32-LIFETIME-NEXT: cleanuppad
// WIN32-LIFETIME: %[[bc2:.*]] = bitcast %"struct.lifetime_marker::C"* %[[c]] to i8*
// WIN32-LIFETIME: call void @llvm.lifetime.end.p0i8(i64 1, i8* %[[bc2]])
}
struct class_2 {
class_2();
virtual ~class_2();
};
struct class_1 : virtual class_2 {
class_1(){throw "Unhandled exception";}
virtual ~class_1() {}
};
struct class_0 : class_1 {
class_0() ;
virtual ~class_0() {}
};
class_0::class_0() {
// WIN32: define x86_thiscallcc %struct.class_0* @"\01??0class_0@@QAE@XZ"(%struct.class_0* returned %this, i32 %is_most_derived)
// WIN32: store i32 %is_most_derived, i32* %[[IS_MOST_DERIVED_VAR:.*]], align 4
// WIN32: %[[IS_MOST_DERIVED_VAL:.*]] = load i32, i32* %[[IS_MOST_DERIVED_VAR]]
// WIN32: %[[SHOULD_CALL_VBASE_CTORS:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
// WIN32: br i1 %[[SHOULD_CALL_VBASE_CTORS]], label %[[INIT_VBASES:.*]], label %[[SKIP_VBASES:.*]]
// WIN32: [[INIT_VBASES]]
// WIN32: br label %[[SKIP_VBASES]]
// WIN32: [[SKIP_VBASES]]
// ehcleanup:
// WIN32: %[[CLEANUPPAD:.*]] = cleanuppad within none []
// WIN32-NEXT: bitcast %{{.*}}* %{{.*}} to i8*
// WIN32-NEXT: getelementptr inbounds i8, i8* %{{.*}}, i{{.*}} {{.}}
// WIN32-NEXT: bitcast i8* %{{.*}} to %{{.*}}*
// WIN32-NEXT: %[[SHOULD_CALL_VBASE_DTOR:.*]] = icmp ne i32 %[[IS_MOST_DERIVED_VAL]], 0
// WIN32-NEXT: br i1 %[[SHOULD_CALL_VBASE_DTOR]], label %[[DTOR_VBASE:.*]], label %[[SKIP_VBASE:.*]]
// WIN32: [[DTOR_VBASE]]
// WIN32-NEXT: call x86_thiscallcc void @"\01??1class_2@@UAE@XZ"
// WIN32: br label %[[SKIP_VBASE]]
// WIN32: [[SKIP_VBASE]]
}
|
