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
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
|
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -triple x86_64-apple-macosx10.13.99 -std=c++11 -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=UNALIGNED %s
// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -triple x86_64-apple-macosx10.14 -std=c++11 -emit-llvm -o - %s | FileCheck --check-prefix=CHECK --check-prefix=ALIGNED %s
struct test1_D {
double d;
} d1;
void test1() {
throw d1;
}
// CHECK-LABEL: define{{.*}} void @_Z5test1v()
// CHECK: [[EXNOBJ:%.*]] = call ptr @__cxa_allocate_exception(i64 8)
// UNALIGNED-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 8 [[EXNOBJ]], ptr align 8 @d1, i64 8, i1 false)
// ALIGNED-NEXT: call void @llvm.memcpy.p0.p0.i64(ptr align 16 [[EXNOBJ]], ptr align 8 @d1, i64 8, i1 false)
// CHECK-NEXT: call void @__cxa_throw(ptr [[EXNOBJ]], ptr @_ZTI7test1_D, ptr null) [[NR:#[0-9]+]]
// CHECK-NEXT: unreachable
struct test2_D {
test2_D(const test2_D&o);
test2_D();
virtual void bar() { }
int i; int j;
} d2;
void test2() {
throw d2;
}
// CHECK-LABEL: define{{.*}} void @_Z5test2v()
// CHECK: [[EXNVAR:%.*]] = alloca ptr
// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
// CHECK-NEXT: [[EXNOBJ:%.*]] = call ptr @__cxa_allocate_exception(i64 16)
// CHECK-NEXT: invoke void @_ZN7test2_DC1ERKS_(ptr {{[^,]*}} [[EXNOBJ]], ptr noundef nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) @d2)
// CHECK-NEXT: to label %[[CONT:.*]] unwind label %{{.*}}
// : [[CONT]]: (can't check this in Release-Asserts builds)
// CHECK: call void @__cxa_throw(ptr [[EXNOBJ]], ptr @_ZTI7test2_D, ptr null) [[NR]]
// CHECK-NEXT: unreachable
struct test3_D {
test3_D() { }
test3_D(volatile test3_D&o);
virtual void bar();
};
void test3() {
throw (volatile test3_D *)0;
}
// CHECK-LABEL: define{{.*}} void @_Z5test3v()
// CHECK: [[EXNOBJ:%.*]] = call ptr @__cxa_allocate_exception(i64 8)
// CHECK-NEXT: store ptr null, ptr [[EXNOBJ]]
// CHECK-NEXT: call void @__cxa_throw(ptr [[EXNOBJ]], ptr @_ZTIPV7test3_D, ptr null) [[NR]]
// CHECK-NEXT: unreachable
void test4() {
throw;
}
// CHECK-LABEL: define{{.*}} void @_Z5test4v()
// CHECK: call void @__cxa_rethrow() [[NR]]
// CHECK-NEXT: unreachable
// rdar://problem/7696549
namespace test5 {
struct A {
A();
A(const A&);
~A();
};
void test() {
try { throw A(); } catch (A &x) {}
}
// CHECK-LABEL: define{{.*}} void @_ZN5test54testEv()
// CHECK: [[EXNOBJ:%.*]] = call ptr @__cxa_allocate_exception(i64 1)
// CHECK: invoke void @_ZN5test51AC1Ev(ptr {{[^,]*}} [[EXNOBJ]])
// CHECK: invoke void @__cxa_throw(ptr [[EXNOBJ]], ptr @_ZTIN5test51AE, ptr @_ZN5test51AD1Ev) [[NR]]
// CHECK-NEXT: to label {{%.*}} unwind label %[[HANDLER:[^ ]*]]
// : [[HANDLER]]: (can't check this in Release-Asserts builds)
// CHECK: {{%.*}} = call i32 @llvm.eh.typeid.for(ptr @_ZTIN5test51AE)
}
namespace test6 {
template <class T> struct allocator {
~allocator() throw() { }
};
void foo() {
allocator<int> a;
}
}
// PR7127
namespace test7 {
// CHECK-LABEL: define{{.*}} i32 @_ZN5test73fooEv()
// CHECK-SAME: personality ptr @__gxx_personality_v0
int foo() {
// CHECK: [[CAUGHTEXNVAR:%.*]] = alloca ptr
// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
// CHECK-NEXT: [[INTCATCHVAR:%.*]] = alloca i32
try {
try {
// CHECK-NEXT: [[EXNALLOC:%.*]] = call ptr @__cxa_allocate_exception
// CHECK-NEXT: store i32 1, ptr
// CHECK-NEXT: invoke void @__cxa_throw(ptr [[EXNALLOC]], ptr @_ZTIi, ptr null
throw 1;
}
// CHECK: [[CAUGHTVAL:%.*]] = landingpad { ptr, i32 }
// CHECK-NEXT: catch ptr @_ZTIi
// CHECK-NEXT: catch ptr null
// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { ptr, i32 } [[CAUGHTVAL]], 0
// CHECK-NEXT: store ptr [[CAUGHTEXN]], ptr [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { ptr, i32 } [[CAUGHTVAL]], 1
// CHECK-NEXT: store i32 [[SELECTOR]], ptr [[SELECTORVAR]]
// CHECK-NEXT: br label
// CHECK: [[SELECTOR:%.*]] = load i32, ptr [[SELECTORVAR]]
// CHECK-NEXT: [[T0:%.*]] = call i32 @llvm.eh.typeid.for(ptr @_ZTIi)
// CHECK-NEXT: icmp eq i32 [[SELECTOR]], [[T0]]
// CHECK-NEXT: br i1
// CHECK: [[T0:%.*]] = load ptr, ptr [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[T1:%.*]] = call ptr @__cxa_begin_catch(ptr [[T0]])
// CHECK-NEXT: [[T3:%.*]] = load i32, ptr [[T1]]
// CHECK-NEXT: store i32 [[T3]], ptr {{%.*}}, align 4
// CHECK-NEXT: invoke void @__cxa_rethrow
catch (int) {
throw;
}
}
// CHECK: [[CAUGHTVAL:%.*]] = landingpad { ptr, i32 }
// CHECK-NEXT: catch ptr null
// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { ptr, i32 } [[CAUGHTVAL]], 0
// CHECK-NEXT: store ptr [[CAUGHTEXN]], ptr [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { ptr, i32 } [[CAUGHTVAL]], 1
// CHECK-NEXT: store i32 [[SELECTOR]], ptr [[SELECTORVAR]]
// CHECK-NEXT: call void @__cxa_end_catch()
// CHECK-NEXT: br label
// CHECK: load ptr, ptr [[CAUGHTEXNVAR]]
// CHECK-NEXT: call ptr @__cxa_begin_catch
// CHECK-NEXT: call void @__cxa_end_catch
catch (...) {
}
// CHECK: ret i32 0
return 0;
}
}
// Ordering of destructors in a catch handler.
namespace test8 {
struct A { A(const A&); ~A(); };
void bar();
// CHECK-LABEL: define{{.*}} void @_ZN5test83fooEv()
void foo() {
try {
// CHECK: invoke void @_ZN5test83barEv()
bar();
} catch (A a) {
// CHECK: call ptr @__cxa_get_exception_ptr
// CHECK-NEXT: invoke void @_ZN5test81AC1ERKS0_(
// CHECK: call ptr @__cxa_begin_catch
// CHECK-NEXT: call void @_ZN5test81AD1Ev(
// CHECK: call void @__cxa_end_catch()
// CHECK: ret void
}
}
}
// Constructor function-try-block must rethrow on fallthrough.
// rdar://problem/7696603
namespace test9 {
void opaque();
struct A { A(); };
// CHECK-LABEL: define{{.*}} void @_ZN5test91AC2Ev(ptr {{[^,]*}} %this) unnamed_addr
// CHECK-SAME: personality ptr @__gxx_personality_v0
A::A() try {
// CHECK: invoke void @_ZN5test96opaqueEv()
opaque();
} catch (int x) {
// CHECK: landingpad { ptr, i32 }
// CHECK-NEXT: catch ptr @_ZTIi
// CHECK: call ptr @__cxa_begin_catch
// CHECK: invoke void @_ZN5test96opaqueEv()
// CHECK: invoke void @__cxa_rethrow()
// CHECK-LABEL: define{{.*}} void @_ZN5test91AC1Ev(ptr {{[^,]*}} %this) unnamed_addr
// CHECK: call void @_ZN5test91AC2Ev
// CHECK-NEXT: ret void
opaque();
}
}
// __cxa_end_catch can throw for some kinds of caught exceptions.
namespace test10 {
void opaque();
struct A { ~A(); };
struct B { int x; };
// CHECK-LABEL: define{{.*}} void @_ZN6test103fooEv()
void foo() {
A a; // force a cleanup context
try {
// CHECK: invoke void @_ZN6test106opaqueEv()
opaque();
} catch (int i) {
// CHECK: call ptr @__cxa_begin_catch
// CHECK-NEXT: load i32, ptr
// CHECK-NEXT: store i32
// CHECK-NEXT: call void @__cxa_end_catch() [[NUW:#[0-9]+]]
} catch (B a) {
// CHECK: call ptr @__cxa_begin_catch
// CHECK-NEXT: call void @llvm.memcpy
// CHECK-NEXT: invoke void @__cxa_end_catch()
} catch (...) {
// CHECK: call ptr @__cxa_begin_catch
// CHECK-NEXT: invoke void @__cxa_end_catch()
}
// CHECK: call void @_ZN6test101AD1Ev(
}
}
// __cxa_begin_catch returns pointers by value, even when catching by reference
// <rdar://problem/8212123>
namespace test11 {
void opaque();
// CHECK-LABEL: define{{.*}} void @_ZN6test113fooEv()
void foo() {
try {
// CHECK: invoke void @_ZN6test116opaqueEv()
opaque();
} catch (int**&p) {
// CHECK: [[EXN:%.*]] = load ptr, ptr
// CHECK-NEXT: call ptr @__cxa_begin_catch(ptr [[EXN]]) [[NUW]]
// CHECK-NEXT: [[ADJ1:%.*]] = getelementptr i8, ptr [[EXN]], i32 32
// CHECK-NEXT: store ptr [[ADJ1]], ptr [[P:%.*]]
// CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
}
}
struct A {};
// CHECK-LABEL: define{{.*}} void @_ZN6test113barEv()
void bar() {
try {
// CHECK: [[EXNSLOT:%.*]] = alloca ptr
// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
// CHECK-NEXT: [[P:%.*]] = alloca ptr,
// CHECK-NEXT: [[TMP:%.*]] = alloca ptr
// CHECK-NEXT: invoke void @_ZN6test116opaqueEv()
opaque();
} catch (A*&p) {
// CHECK: [[EXN:%.*]] = load ptr, ptr [[EXNSLOT]]
// CHECK-NEXT: [[ADJ1:%.*]] = call ptr @__cxa_begin_catch(ptr [[EXN]]) [[NUW]]
// CHECK-NEXT: store ptr [[ADJ1]], ptr [[TMP]]
// CHECK-NEXT: store ptr [[TMP]], ptr [[P]]
// CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
}
}
}
// PR7686
namespace test12 {
struct A { ~A() noexcept(false); };
bool opaque(const A&);
// CHECK-LABEL: define{{.*}} void @_ZN6test124testEv()
void test() {
// CHECK: [[X:%.*]] = alloca [[A:%.*]],
// CHECK: [[EHCLEANUPDEST:%.*]] = alloca i32
// CHECK: [[Y:%.*]] = alloca [[A:%.*]]
// CHECK: [[Z:%.*]] = alloca [[A]]
// CHECK: [[CLEANUPDEST:%.*]] = alloca i32
A x;
// CHECK: invoke noundef zeroext i1 @_ZN6test126opaqueERKNS_1AE(
if (opaque(x)) {
A y;
A z;
// CHECK: invoke void @_ZN6test121AD1Ev(ptr {{[^,]*}} [[Z]])
// CHECK: invoke void @_ZN6test121AD1Ev(ptr {{[^,]*}} [[Y]])
// CHECK-NOT: switch
goto success;
}
success:
bool _ = true;
// CHECK: call void @_ZN6test121AD1Ev(ptr {{[^,]*}} [[X]])
// CHECK-NEXT: ret void
}
}
// Reduced from some TableGen code that was causing a self-host crash.
namespace test13 {
struct A { ~A(); };
void test0(int x) {
try {
switch (x) {
case 0:
break;
case 1:{
A a;
break;
}
default:
return;
}
return;
} catch (int x) {
}
return;
}
void test1(int x) {
A y;
try {
switch (x) {
default: break;
}
} catch (int x) {}
}
}
// rdar://problem/8231514
namespace test14 {
struct A { ~A(); };
struct B { ~B(); };
B b();
void opaque();
void foo() {
A a;
try {
B str = b();
opaque();
} catch (int x) {
}
}
}
// rdar://problem/8231514
// JumpDests shouldn't get confused by scopes that aren't normal cleanups.
namespace test15 {
struct A { ~A(); };
bool opaque(int);
// CHECK-LABEL: define{{.*}} void @_ZN6test153fooEv()
void foo() {
A a;
try {
// CHECK: [[X:%.*]] = alloca i32
// CHECK: store i32 10, ptr [[X]]
// CHECK-NEXT: br label
// -> while.cond
int x = 10;
while (true) {
// CHECK: load i32, ptr [[X]]
// CHECK-NEXT: [[COND:%.*]] = invoke noundef zeroext i1 @_ZN6test156opaqueEi
// CHECK: br i1 [[COND]]
if (opaque(x))
// CHECK: br label
break;
// CHECK: br label
}
// CHECK: br label
} catch (int x) { }
// CHECK: call void @_ZN6test151AD1Ev
}
}
namespace test16 {
struct A { A(); ~A() noexcept(false); };
struct B { int x; B(const A &); ~B() noexcept(false); };
void foo();
bool cond();
// CHECK-LABEL: define{{.*}} void @_ZN6test163barEv()
void bar() {
// CHECK: [[EXN_SAVE:%.*]] = alloca ptr
// CHECK-NEXT: [[EXN_ACTIVE:%.*]] = alloca i1
// CHECK-NEXT: [[TEMP:%.*]] = alloca [[A:%.*]],
// CHECK-NEXT: [[EXNSLOT:%.*]] = alloca ptr
// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
// CHECK-NEXT: [[TEMP_ACTIVE:%.*]] = alloca i1
cond() ? throw B(A()) : foo();
// CHECK-NEXT: [[COND:%.*]] = call noundef zeroext i1 @_ZN6test164condEv()
// CHECK-NEXT: store i1 false, ptr [[EXN_ACTIVE]]
// CHECK-NEXT: store i1 false, ptr [[TEMP_ACTIVE]]
// CHECK-NEXT: br i1 [[COND]],
// CHECK: [[EXN:%.*]] = call ptr @__cxa_allocate_exception(i64 4)
// CHECK-NEXT: store ptr [[EXN]], ptr [[EXN_SAVE]]
// CHECK-NEXT: store i1 true, ptr [[EXN_ACTIVE]]
// CHECK-NEXT: invoke void @_ZN6test161AC1Ev(ptr {{[^,]*}} [[TEMP]])
// CHECK: store i1 true, ptr [[TEMP_ACTIVE]]
// CHECK-NEXT: invoke void @_ZN6test161BC1ERKNS_1AE(ptr {{[^,]*}} [[EXN]], ptr noundef nonnull align {{[0-9]+}} dereferenceable({{[0-9]+}}) [[TEMP]])
// CHECK: store i1 false, ptr [[EXN_ACTIVE]]
// CHECK-NEXT: invoke void @__cxa_throw(ptr [[EXN]],
// CHECK: invoke void @_ZN6test163fooEv()
// CHECK: br label
// CHECK: invoke void @_ZN6test161AD1Ev(ptr {{[^,]*}} [[TEMP]])
// CHECK: ret void
// CHECK: [[T0:%.*]] = load i1, ptr [[EXN_ACTIVE]]
// CHECK-NEXT: br i1 [[T0]]
// CHECK: [[T1:%.*]] = load ptr, ptr [[EXN_SAVE]]
// CHECK-NEXT: call void @__cxa_free_exception(ptr [[T1]])
// CHECK-NEXT: br label
}
}
namespace test17 {
class BaseException {
private:
int a[4];
public:
BaseException() {};
};
class DerivedException: public BaseException {
};
int foo() {
throw DerivedException();
// The alignment passed to memset is 16 on Darwin.
// CHECK: [[T0:%.*]] = call ptr @__cxa_allocate_exception(i64 16)
// UNALIGNED-NEXT: call void @llvm.memset.p0.i64(ptr align 8 [[T0]], i8 0, i64 16, i1 false)
// ALIGNED-NEXT: call void @llvm.memset.p0.i64(ptr align 16 [[T0]], i8 0, i64 16, i1 false)
}
}
// CHECK: attributes [[NUW]] = { nounwind }
// CHECK: attributes [[NR]] = { noreturn }
|
