1 // RUN: %clang_cc1 -fcxx-exceptions -fexceptions -triple x86_64-apple-darwin -std=c++11 -emit-llvm %s -o %t.ll
2 // RUN: FileCheck --input-file=%t.ll %s
3
4 struct test1_D {
5 double d;
6 } d1;
7
test1()8 void test1() {
9 throw d1;
10 }
11
12 // CHECK-LABEL: define void @_Z5test1v()
13 // CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
14 // CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
15 // CHECK-NEXT: [[EXN2:%.*]] = bitcast [[DSTAR]] [[EXN]] to i8*
16 // CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[EXN2]], i8* bitcast ([[DSTAR]] @d1 to i8*), i64 8, i32 8, i1 false)
17 // CHECK-NEXT: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8* }* @_ZTI7test1_D to i8*), i8* null) [[NR:#[0-9]+]]
18 // CHECK-NEXT: unreachable
19
20
21 struct test2_D {
22 test2_D(const test2_D&o);
23 test2_D();
bartest2_D24 virtual void bar() { }
25 int i; int j;
26 } d2;
27
test2()28 void test2() {
29 throw d2;
30 }
31
32 // CHECK-LABEL: define void @_Z5test2v()
33 // CHECK: [[EXNVAR:%.*]] = alloca i8*
34 // CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
35 // CHECK-NEXT: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
36 // CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
37 // CHECK-NEXT: invoke void @_ZN7test2_DC1ERKS_([[DSTAR]] [[EXN]], [[DSTAR]] dereferenceable({{[0-9]+}}) @d2)
38 // CHECK-NEXT: to label %[[CONT:.*]] unwind label %{{.*}}
39 // : [[CONT]]: (can't check this in Release-Asserts builds)
40 // CHECK: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{.*}}* @_ZTI7test2_D to i8*), i8* null) [[NR]]
41 // CHECK-NEXT: unreachable
42
43
44 struct test3_D {
test3_Dtest3_D45 test3_D() { }
46 test3_D(volatile test3_D&o);
47 virtual void bar();
48 };
49
test3()50 void test3() {
51 throw (volatile test3_D *)0;
52 }
53
54 // CHECK-LABEL: define void @_Z5test3v()
55 // CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
56 // CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[D:%[^*]+]]**
57 // CHECK-NEXT: store [[D]]* null, [[D]]** [[EXN]]
58 // CHECK-NEXT: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8*, i32, i8* }* @_ZTIPV7test3_D to i8*), i8* null) [[NR]]
59 // CHECK-NEXT: unreachable
60
61
test4()62 void test4() {
63 throw;
64 }
65
66 // CHECK-LABEL: define void @_Z5test4v()
67 // CHECK: call void @__cxa_rethrow() [[NR]]
68 // CHECK-NEXT: unreachable
69
70
71 // rdar://problem/7696549
72 namespace test5 {
73 struct A {
74 A();
75 A(const A&);
76 ~A();
77 };
78
test()79 void test() {
80 try { throw A(); } catch (A &x) {}
81 }
82 // CHECK-LABEL: define void @_ZN5test54testEv()
83 // CHECK: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 1)
84 // CHECK: [[EXNCAST:%.*]] = bitcast i8* [[EXNOBJ]] to [[A:%[^*]*]]*
85 // CHECK-NEXT: invoke void @_ZN5test51AC1Ev([[A]]* [[EXNCAST]])
86 // CHECK: invoke void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{.*}}* @_ZTIN5test51AE to i8*), i8* bitcast (void ([[A]]*)* @_ZN5test51AD1Ev to i8*)) [[NR]]
87 // CHECK-NEXT: to label {{%.*}} unwind label %[[HANDLER:[^ ]*]]
88 // : [[HANDLER]]: (can't check this in Release-Asserts builds)
89 // CHECK: {{%.*}} = call i32 @llvm.eh.typeid.for(i8* bitcast ({{.*}}* @_ZTIN5test51AE to i8*))
90 }
91
92 namespace test6 {
93 template <class T> struct allocator {
~allocatortest6::allocator94 ~allocator() throw() { }
95 };
96
foo()97 void foo() {
98 allocator<int> a;
99 }
100 }
101
102 // PR7127
103 namespace test7 {
104 // CHECK-LABEL: define i32 @_ZN5test73fooEv()
105 // CHECK-SAME: personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
foo()106 int foo() {
107 // CHECK: [[CAUGHTEXNVAR:%.*]] = alloca i8*
108 // CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
109 // CHECK-NEXT: [[INTCATCHVAR:%.*]] = alloca i32
110 try {
111 try {
112 // CHECK-NEXT: [[EXNALLOC:%.*]] = call i8* @__cxa_allocate_exception
113 // CHECK-NEXT: bitcast i8* [[EXNALLOC]] to i32*
114 // CHECK-NEXT: store i32 1, i32*
115 // CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXNALLOC]], i8* bitcast (i8** @_ZTIi to i8*), i8* null
116 throw 1;
117 }
118
119 // CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 }
120 // CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
121 // CHECK-NEXT: catch i8* null
122 // CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
123 // CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
124 // CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
125 // CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
126 // CHECK-NEXT: br label
127 // CHECK: [[SELECTOR:%.*]] = load i32, i32* [[SELECTORVAR]]
128 // CHECK-NEXT: [[T0:%.*]] = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
129 // CHECK-NEXT: icmp eq i32 [[SELECTOR]], [[T0]]
130 // CHECK-NEXT: br i1
131 // CHECK: [[T0:%.*]] = load i8*, i8** [[CAUGHTEXNVAR]]
132 // CHECK-NEXT: [[T1:%.*]] = call i8* @__cxa_begin_catch(i8* [[T0]])
133 // CHECK-NEXT: [[T2:%.*]] = bitcast i8* [[T1]] to i32*
134 // CHECK-NEXT: [[T3:%.*]] = load i32, i32* [[T2]]
135 // CHECK-NEXT: store i32 [[T3]], i32* {{%.*}}, align 4
136 // CHECK-NEXT: invoke void @__cxa_rethrow
137 catch (int) {
138 throw;
139 }
140 }
141 // CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 }
142 // CHECK-NEXT: catch i8* null
143 // CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
144 // CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
145 // CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
146 // CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
147 // CHECK-NEXT: call void @__cxa_end_catch()
148 // CHECK-NEXT: br label
149 // CHECK: load i8*, i8** [[CAUGHTEXNVAR]]
150 // CHECK-NEXT: call i8* @__cxa_begin_catch
151 // CHECK-NEXT: call void @__cxa_end_catch
152 catch (...) {
153 }
154 // CHECK: ret i32 0
155 return 0;
156 }
157 }
158
159 // Ordering of destructors in a catch handler.
160 namespace test8 {
161 struct A { A(const A&); ~A(); };
162 void bar();
163
164 // CHECK-LABEL: define void @_ZN5test83fooEv()
foo()165 void foo() {
166 try {
167 // CHECK: invoke void @_ZN5test83barEv()
168 bar();
169 } catch (A a) {
170 // CHECK: call i8* @__cxa_get_exception_ptr
171 // CHECK-NEXT: bitcast
172 // CHECK-NEXT: invoke void @_ZN5test81AC1ERKS0_(
173 // CHECK: call i8* @__cxa_begin_catch
174 // CHECK-NEXT: call void @_ZN5test81AD1Ev(
175 // CHECK: call void @__cxa_end_catch()
176 // CHECK: ret void
177 }
178 }
179 }
180
181 // Constructor function-try-block must rethrow on fallthrough.
182 // rdar://problem/7696603
183 namespace test9 {
184 void opaque();
185
186 struct A { A(); };
187
188
189 // CHECK-LABEL: define void @_ZN5test91AC2Ev(%"struct.test9::A"* %this) unnamed_addr
190 // CHECK-SAME: personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
A()191 A::A() try {
192 // CHECK: invoke void @_ZN5test96opaqueEv()
193 opaque();
194 } catch (int x) {
195 // CHECK: landingpad { i8*, i32 }
196 // CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
197
198 // CHECK: call i8* @__cxa_begin_catch
199 // CHECK: invoke void @_ZN5test96opaqueEv()
200 // CHECK: invoke void @__cxa_rethrow()
201
202 // CHECK-LABEL: define void @_ZN5test91AC1Ev(%"struct.test9::A"* %this) unnamed_addr
203 // CHECK: call void @_ZN5test91AC2Ev
204 // CHECK-NEXT: ret void
205 opaque();
206 }
207 }
208
209 // __cxa_end_catch can throw for some kinds of caught exceptions.
210 namespace test10 {
211 void opaque();
212
213 struct A { ~A(); };
214 struct B { int x; };
215
216 // CHECK-LABEL: define void @_ZN6test103fooEv()
foo()217 void foo() {
218 A a; // force a cleanup context
219
220 try {
221 // CHECK: invoke void @_ZN6test106opaqueEv()
222 opaque();
223 } catch (int i) {
224 // CHECK: call i8* @__cxa_begin_catch
225 // CHECK-NEXT: bitcast
226 // CHECK-NEXT: load i32, i32*
227 // CHECK-NEXT: store i32
228 // CHECK-NEXT: call void @__cxa_end_catch() [[NUW:#[0-9]+]]
229 } catch (B a) {
230 // CHECK: call i8* @__cxa_begin_catch
231 // CHECK-NEXT: bitcast
232 // CHECK-NEXT: bitcast
233 // CHECK-NEXT: bitcast
234 // CHECK-NEXT: call void @llvm.memcpy
235 // CHECK-NEXT: invoke void @__cxa_end_catch()
236 } catch (...) {
237 // CHECK: call i8* @__cxa_begin_catch
238 // CHECK-NEXT: invoke void @__cxa_end_catch()
239 }
240
241 // CHECK: call void @_ZN6test101AD1Ev(
242 }
243 }
244
245 // __cxa_begin_catch returns pointers by value, even when catching by reference
246 // <rdar://problem/8212123>
247 namespace test11 {
248 void opaque();
249
250 // CHECK-LABEL: define void @_ZN6test113fooEv()
foo()251 void foo() {
252 try {
253 // CHECK: invoke void @_ZN6test116opaqueEv()
254 opaque();
255 } catch (int**&p) {
256 // CHECK: [[EXN:%.*]] = load i8*, i8**
257 // CHECK-NEXT: call i8* @__cxa_begin_catch(i8* [[EXN]]) [[NUW]]
258 // CHECK-NEXT: [[ADJ1:%.*]] = getelementptr i8, i8* [[EXN]], i32 32
259 // CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to i32***
260 // CHECK-NEXT: store i32*** [[ADJ2]], i32**** [[P:%.*]]
261 // CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
262 }
263 }
264
265 struct A {};
266
267 // CHECK-LABEL: define void @_ZN6test113barEv()
bar()268 void bar() {
269 try {
270 // CHECK: [[EXNSLOT:%.*]] = alloca i8*
271 // CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
272 // CHECK-NEXT: [[P:%.*]] = alloca [[A:%.*]]**,
273 // CHECK-NEXT: [[TMP:%.*]] = alloca [[A]]*
274 // CHECK-NEXT: invoke void @_ZN6test116opaqueEv()
275 opaque();
276 } catch (A*&p) {
277 // CHECK: [[EXN:%.*]] = load i8*, i8** [[EXNSLOT]]
278 // CHECK-NEXT: [[ADJ1:%.*]] = call i8* @__cxa_begin_catch(i8* [[EXN]]) [[NUW]]
279 // CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to [[A]]*
280 // CHECK-NEXT: store [[A]]* [[ADJ2]], [[A]]** [[TMP]]
281 // CHECK-NEXT: store [[A]]** [[TMP]], [[A]]*** [[P]]
282 // CHECK-NEXT: call void @__cxa_end_catch() [[NUW]]
283 }
284 }
285 }
286
287 // PR7686
288 namespace test12 {
289 struct A { ~A() noexcept(false); };
290 bool opaque(const A&);
291
292 // CHECK-LABEL: define void @_ZN6test124testEv()
test()293 void test() {
294 // CHECK: [[X:%.*]] = alloca [[A:%.*]],
295 // CHECK: [[EHCLEANUPDEST:%.*]] = alloca i32
296 // CHECK: [[Y:%.*]] = alloca [[A]]
297 // CHECK: [[Z:%.*]] = alloca [[A]]
298 // CHECK: [[CLEANUPDEST:%.*]] = alloca i32
299
300 A x;
301 // CHECK: invoke zeroext i1 @_ZN6test126opaqueERKNS_1AE(
302 if (opaque(x)) {
303 A y;
304 A z;
305
306 // CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Z]])
307 // CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Y]])
308 // CHECK-NOT: switch
309 goto success;
310 }
311
312 success:
313 bool _ = true;
314
315 // CHECK: call void @_ZN6test121AD1Ev([[A]]* [[X]])
316 // CHECK-NEXT: ret void
317 }
318 }
319
320 // Reduced from some TableGen code that was causing a self-host crash.
321 namespace test13 {
322 struct A { ~A(); };
323
test0(int x)324 void test0(int x) {
325 try {
326 switch (x) {
327 case 0:
328 break;
329 case 1:{
330 A a;
331 break;
332 }
333 default:
334 return;
335 }
336 return;
337 } catch (int x) {
338 }
339 return;
340 }
341
test1(int x)342 void test1(int x) {
343 A y;
344 try {
345 switch (x) {
346 default: break;
347 }
348 } catch (int x) {}
349 }
350 }
351
352 // rdar://problem/8231514
353 namespace test14 {
354 struct A { ~A(); };
355 struct B { ~B(); };
356
357 B b();
358 void opaque();
359
foo()360 void foo() {
361 A a;
362 try {
363 B str = b();
364 opaque();
365 } catch (int x) {
366 }
367 }
368 }
369
370 // rdar://problem/8231514
371 // JumpDests shouldn't get confused by scopes that aren't normal cleanups.
372 namespace test15 {
373 struct A { ~A(); };
374
375 bool opaque(int);
376
377 // CHECK-LABEL: define void @_ZN6test153fooEv()
foo()378 void foo() {
379 A a;
380
381 try {
382 // CHECK: [[X:%.*]] = alloca i32
383 // CHECK: store i32 10, i32* [[X]]
384 // CHECK-NEXT: br label
385 // -> while.cond
386 int x = 10;
387
388 while (true) {
389 // CHECK: load i32, i32* [[X]]
390 // CHECK-NEXT: [[COND:%.*]] = invoke zeroext i1 @_ZN6test156opaqueEi
391 // CHECK: br i1 [[COND]]
392 if (opaque(x))
393 // CHECK: br label
394 break;
395
396 // CHECK: br label
397 }
398 // CHECK: br label
399 } catch (int x) { }
400
401 // CHECK: call void @_ZN6test151AD1Ev
402 }
403 }
404
405 namespace test16 {
406 struct A { A(); ~A() noexcept(false); };
407 struct B { int x; B(const A &); ~B() noexcept(false); };
408 void foo();
409 bool cond();
410
411 // CHECK-LABEL: define void @_ZN6test163barEv()
bar()412 void bar() {
413 // CHECK: [[EXN_SAVE:%.*]] = alloca i8*
414 // CHECK-NEXT: [[EXN_ACTIVE:%.*]] = alloca i1
415 // CHECK-NEXT: [[TEMP:%.*]] = alloca [[A:%.*]],
416 // CHECK-NEXT: [[EXNSLOT:%.*]] = alloca i8*
417 // CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
418 // CHECK-NEXT: [[TEMP_ACTIVE:%.*]] = alloca i1
419
420 cond() ? throw B(A()) : foo();
421
422 // CHECK-NEXT: [[COND:%.*]] = call zeroext i1 @_ZN6test164condEv()
423 // CHECK-NEXT: store i1 false, i1* [[EXN_ACTIVE]]
424 // CHECK-NEXT: store i1 false, i1* [[TEMP_ACTIVE]]
425 // CHECK-NEXT: br i1 [[COND]],
426
427 // CHECK: [[EXN:%.*]] = call i8* @__cxa_allocate_exception(i64 4)
428 // CHECK-NEXT: store i8* [[EXN]], i8** [[EXN_SAVE]]
429 // CHECK-NEXT: store i1 true, i1* [[EXN_ACTIVE]]
430 // CHECK-NEXT: [[T0:%.*]] = bitcast i8* [[EXN]] to [[B:%.*]]*
431 // CHECK-NEXT: invoke void @_ZN6test161AC1Ev([[A]]* [[TEMP]])
432 // CHECK: store i1 true, i1* [[TEMP_ACTIVE]]
433 // CHECK-NEXT: invoke void @_ZN6test161BC1ERKNS_1AE([[B]]* [[T0]], [[A]]* dereferenceable({{[0-9]+}}) [[TEMP]])
434 // CHECK: store i1 false, i1* [[EXN_ACTIVE]]
435 // CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXN]],
436
437 // CHECK: invoke void @_ZN6test163fooEv()
438 // CHECK: br label
439
440 // CHECK: invoke void @_ZN6test161AD1Ev([[A]]* [[TEMP]])
441 // CHECK: ret void
442
443 // CHECK: [[T0:%.*]] = load i1, i1* [[EXN_ACTIVE]]
444 // CHECK-NEXT: br i1 [[T0]]
445 // CHECK: [[T1:%.*]] = load i8*, i8** [[EXN_SAVE]]
446 // CHECK-NEXT: call void @__cxa_free_exception(i8* [[T1]])
447 // CHECK-NEXT: br label
448 }
449 }
450
451 namespace test17 {
452 class BaseException {
453 private:
454 int a[4];
455 public:
BaseException()456 BaseException() {};
457 };
458
459 class DerivedException: public BaseException {
460 };
461
foo()462 int foo() {
463 throw DerivedException();
464 // The alignment passed to memset is 8, not 16, on Darwin.
465
466 // CHECK: [[T0:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
467 // CHECK-NEXT: [[T1:%.*]] = bitcast i8* [[T0]] to %"class.test17::DerivedException"*
468 // CHECK-NEXT: [[T2:%.*]] = bitcast %"class.test17::DerivedException"* [[T1]] to i8*
469 // CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* [[T2]], i8 0, i64 16, i32 8, i1 false)
470 }
471 }
472
473 // CHECK: attributes [[NUW]] = { nounwind }
474 // CHECK: attributes [[NR]] = { noreturn }
475