test/CodeGenCXX/eh.cpp

// RUN: %clang_cc1 -fexceptions -triple x86_64-apple-darwin -std=c++0x -emit-llvm %s -o %t.ll
// RUN: FileCheck --input-file=%t.ll %s

struct test1_D {
  double d;
} d1;

void test1() {
  throw d1;
}

// CHECK:     define void @_Z5test1v()
// CHECK:       [[FREEVAR:%.*]] = alloca i1
// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
// CHECK-NEXT:  [[EXN2:%.*]] = bitcast [[DSTAR]] [[EXN]] to i8*
// CHECK-NEXT:  call void @llvm.memcpy.p0i8.p0i8.i64(i8* [[EXN2]], i8* bitcast ([[DSTAR]] @d1 to i8*), i64 8, i32 8, i1 false)
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%0* @_ZTI7test1_D to i8*), i8* null) noreturn
// 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:     define void @_Z5test2v()
// CHECK:       [[FREEVAR:%.*]] = alloca i1
// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSTAR:%[^*]*\*]]
// CHECK-NEXT:  invoke void @_ZN7test2_DC1ERKS_([[DSTAR]] [[EXN]], [[DSTAR]] @d2)
// CHECK-NEXT:     to label %[[CONT:.*]] unwind label %{{.*}}
// CHECK:     [[CONT]]:
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%{{.*}}* @_ZTI7test2_D to i8*), i8* null) noreturn
// 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:     define void @_Z5test3v()
// CHECK:       [[FREEVAR:%.*]] = alloca i1
// CHECK-NEXT:  [[EXNOBJVAR:%.*]] = alloca i8*
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
// CHECK-NEXT:  store i8* [[EXNOBJ]], i8** [[EXNOBJVAR]]
// CHECK-NEXT:  store i1 true, i1* [[FREEVAR]]
// CHECK-NEXT:  [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[DSS:%[^*]*\*]]*
// CHECK-NEXT:  store [[DSS]] null, [[DSS]]* [[EXN]]
// CHECK-NEXT:  store i1 false, i1* [[FREEVAR]]
// CHECK-NEXT:  call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast (%1* @_ZTIPV7test3_D to i8*), i8* null) noreturn
// CHECK-NEXT:  unreachable


void test4() {
  throw;
}

// CHECK:     define void @_Z5test4v()
// CHECK:        call void @__cxa_rethrow() noreturn
// CHECK-NEXT:   unreachable


// rdar://problem/7696549
namespace test5 {
  struct A {
    A();
    A(const A&);
    ~A();
  };

  void test() {
    try { throw A(); } catch (A &x) {}
  }
// CHECK:      define void @_ZN5test54testEv()
// CHECK:      [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 1)
// CHECK:      [[EXNCAST:%.*]] = bitcast i8* [[EXNOBJ]] to [[A:%[^*]*]]*
// CHECK-NEXT: invoke void @_ZN5test51AC1Ev([[A]]* [[EXNCAST]])
// CHECK:      invoke void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({{%.*}}* @_ZTIN5test51AE to i8*), i8* bitcast (void ([[A]]*)* @_ZN5test51AD1Ev to i8*)) noreturn
// CHECK-NEXT:   to label {{%.*}} unwind label %[[HANDLER:[^ ]*]]
// CHECK:    [[HANDLER]]:
// CHECK:      {{%.*}} = call i32 @llvm.eh.typeid.for(i8* bitcast ({{%.*}}* @_ZTIN5test51AE to i8*))
}