eh.cpp revision 09faeabf39a6fab2e2beb6bf03da970c17d2049a 
1// RUN: %clang_cc1 -fexceptions -triple x86_64-apple-darwin -std=c++0x -emit-llvm %s -o %t.ll
2// RUN: FileCheck --input-file=%t.ll %s
3
4struct test1_D {
5  double d;
6} d1;
7
8void test1() {
9  throw d1;
10}
11
12// CHECK:     define void @_Z5test1v()
13// CHECK:       [[FREEVAR:%.*]] = alloca i1
14// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
15// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
16// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
17// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
18// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
19// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
20// CHECK-NEXT:  [[EXN2:%.*]] = bitcast [[DSTAR]] [[EXN]] to i8*
21// CHECK-NEXT:  call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[EXN2]], i8* bitcast ([[DSTAR]] @d1 to i8*), i64 8, i32 8, i1 false)
22// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
23// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%0* @_ZTI7test1_D to i8*), i8* null) noreturn
24// CHECK-NEXT:  unreachable
25
26
27struct test2_D {
28  test2_D(const test2_D&o);
29  test2_D();
30  virtual void bar() { }
31  int i; int j;
32} d2;
33
34void test2() {
35  throw d2;
36}
37
38// CHECK:     define void @_Z5test2v()
39// CHECK:       [[FREEVAR:%.*]] = alloca i1
40// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
41// CHECK-NEXT:  [[EXNSLOTVAR:%.*]] = alloca i8*
42// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
43// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
44// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
45// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
46// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
47// CHECK-NEXT:  invoke void @_ZN7test2_DC1ERKS_([[DSTAR]] [[EXN]], [[DSTAR]] @d2)
48// CHECK-NEXT:     to label %[[CONT:.*]] unwind label %{{.*}}
49//      :     [[CONT]]:   (can't check this in Release-Asserts builds)
50// CHECK:       store i1 false, i1* [[FREEVAR]]
51// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%{{.*}}* @_ZTI7test2_D to i8*), i8* null) noreturn
52// CHECK-NEXT:  unreachable
53
54
55struct test3_D {
56  test3_D() { }
57  test3_D(volatile test3_D&o);
58  virtual void bar();
59};
60
61void test3() {
62  throw (volatile test3_D *)0;
63}
64
65// CHECK:     define void @_Z5test3v()
66// CHECK:       [[FREEVAR:%.*]] = alloca i1
67// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
68// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
69// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
70// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
71// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
72// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSS:%[^*]*\*]]*
73// CHECK-NEXT:  store [[DSS]] null, [[DSS]]* [[EXN]]
74// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
75// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%1* @_ZTIPV7test3_D to i8*), i8* null) noreturn
76// CHECK-NEXT:  unreachable
77
78
79void test4() {
80  throw;
81}
82
83// CHECK:     define void @_Z5test4v()
84// CHECK:        call void @__cxa_rethrow() noreturn
85// CHECK-NEXT:   unreachable
86
87
88// rdar://problem/7696549
89namespace test5 {
90  struct A {
91    A();
92    A(const A&);
93    ~A();
94  };
95
96  void test() {
97    try { throw A(); } catch (A &x) {}
98  }
99// CHECK:      define void @_ZN5test54testEv()
100// CHECK:      [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 1)
101// CHECK:      [[EXNCAST:%.*]] = bitcast i8* [[EXNOBJ]] to [[A:%[^*]*]]*
102// CHECK-NEXT: invoke void @_ZN5test51AC1Ev([[A]]* [[EXNCAST]])
103// CHECK:      invoke void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{%.*}}* @_ZTIN5test51AE to i8*), i8* bitcast (void ([[A]]*)* @_ZN5test51AD1Ev to i8*)) noreturn
104// CHECK-NEXT:   to label {{%.*}} unwind label %[[HANDLER:[^ ]*]]
105//      :    [[HANDLER]]:  (can't check this in Release-Asserts builds)
106// CHECK:      {{%.*}} = call i32 @llvm.eh.typeid.for(i8* bitcast ({{%.*}}* @_ZTIN5test51AE to i8*))
107}
108
109namespace test6 {
110  template <class T> struct allocator {
111    ~allocator() throw() { }
112  };
113
114  void foo() {
115    allocator<int> a;
116  }
117}
118
119// PR7127
120namespace test7 {
121// CHECK:      define i32 @_ZN5test73fooEv()
122  int foo() {
123// CHECK:      [[FREEEXNOBJ:%.*]] = alloca i1
124// CHECK-NEXT: [[EXNALLOCVAR:%.*]] = alloca i8*
125// CHECK-NEXT: [[CAUGHTEXNVAR:%.*]] = alloca i8*
126// CHECK-NEXT: [[INTCATCHVAR:%.*]] = alloca i32
127// CHECK-NEXT: store i1 false, i1* [[FREEEXNOBJ]]
128    try {
129      try {
130// CHECK-NEXT: [[EXNALLOC:%.*]] = call i8* @__cxa_allocate_exception
131// CHECK-NEXT: store i8* [[EXNALLOC]], i8** [[EXNALLOCVAR]]
132// CHECK-NEXT: store i1 true, i1* [[FREEEXNOBJ]]
133// CHECK-NEXT: bitcast i8* [[EXNALLOC]] to i32*
134// CHECK-NEXT: store i32 1, i32*
135// CHECK-NEXT: store i1 false, i1* [[FREEEXNOBJ]]
136// CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXNALLOC]], i8* bitcast (i8** @_ZTIi to i8*), i8* null
137        throw 1;
138      }
139
140// CHECK:      [[CAUGHTEXN:%.*]] = call i8* @llvm.eh.exception()
141// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
142// CHECK-NEXT: call i32 (i8*, i8*, ...)* @llvm.eh.selector(i8* [[CAUGHTEXN]], i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*), i8* bitcast (i8** @_ZTIi to i8*), i8* null)
143// CHECK-NEXT: call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
144// CHECK-NEXT: icmp eq
145// CHECK-NEXT: br i1
146// CHECK:      load i8** [[CAUGHTEXNVAR]]
147// CHECK-NEXT: call i8* @__cxa_begin_catch
148// CHECK:      invoke void @__cxa_rethrow
149      catch (int) {
150        throw;
151      }
152    }
153// CHECK:      [[CAUGHTEXN:%.*]] = call i8* @llvm.eh.exception()
154// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
155// CHECK-NEXT: call i32 (i8*, i8*, ...)* @llvm.eh.selector(i8* [[CAUGHTEXN]], i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*), i8* null)
156// CHECK-NEXT: call void @__cxa_end_catch()
157// CHECK-NEXT: br label
158// CHECK:      load i8** [[CAUGHTEXNVAR]]
159// CHECK-NEXT: call i8* @__cxa_begin_catch
160// CHECK-NEXT: call void @__cxa_end_catch
161    catch (...) {
162    }
163// CHECK:      ret i32 0
164    return 0;
165  }
166}
167
168// Ordering of destructors in a catch handler.
169namespace test8 {
170  struct A { A(const A&); ~A(); };
171  void bar();
172
173  // CHECK: define void @_ZN5test83fooEv()
174  void foo() {
175    try {
176      // CHECK:      invoke void @_ZN5test83barEv()
177      bar();
178    } catch (A a) {
179      // CHECK:      call i8* @__cxa_get_exception_ptr
180      // CHECK-NEXT: bitcast
181      // CHECK-NEXT: invoke void @_ZN5test81AC1ERKS0_(
182      // CHECK:      call i8* @__cxa_begin_catch
183      // CHECK-NEXT: invoke void @_ZN5test81AD1Ev(
184
185      // CHECK:      call void @__cxa_end_catch()
186      // CHECK-NEXT: load
187      // CHECK-NEXT: switch
188
189      // CHECK:      ret void
190    }
191  }
192}
193
194// Constructor function-try-block must rethrow on fallthrough.
195// rdar://problem/7696603
196namespace test9 {
197  void opaque();
198
199  struct A { A(); };
200
201  // CHECK:      define void @_ZN5test91AC1Ev
202  // CHECK:      call void @_ZN5test91AC2Ev
203  // CHECK-NEXT: ret void
204
205  // CHECK: define void @_ZN5test91AC2Ev(
206  A::A() try {
207  // CHECK:      invoke void @_ZN5test96opaqueEv()
208    opaque();
209  } catch (int x) {
210  // CHECK:      call i8* @__cxa_begin_catch
211  // CHECK:      invoke void @_ZN5test96opaqueEv()
212  // CHECK:      invoke void @__cxa_rethrow()
213    opaque();
214  }
215
216  // landing pad from first call to invoke
217  // CHECK:      call i8* @llvm.eh.exception
218  // CHECK:      call i32 (i8*, i8*, ...)* @llvm.eh.selector(i8* {{.*}}, i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*), i8* bitcast (i8** @_ZTIi to i8*), i8* null)
219}
220