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llvm-project/clang/test/CodeGenCXX/eh.cpp

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// RUN: %clang_cc1 -fcxx-exceptions -fexceptions -triple x86_64-apple-darwin -std=c++11 -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: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
// 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: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8* }* @_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: [[EXNVAR:%.*]] = alloca i8*
// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
// CHECK-NEXT: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 16)
// 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 %{{.*}}
// : [[CONT]]: (can't check this in Release-Asserts builds)
// CHECK: 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: [[EXNOBJ:%.*]] = call i8* @__cxa_allocate_exception(i64 8)
// CHECK-NEXT: [[EXN:%.*]] = bitcast i8* [[EXNOBJ]] to [[D:%[^*]+]]**
// CHECK-NEXT: store [[D]]* null, [[D]]** [[EXN]]
// CHECK-NEXT: call void @__cxa_throw(i8* [[EXNOBJ]], i8* bitcast ({ i8*, i8*, i32, i8* }* @_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:[^ ]*]]
// : [[HANDLER]]: (can't check this in Release-Asserts builds)
// CHECK: {{%.*}} = call i32 @llvm.eh.typeid.for(i8* bitcast ({{.*}}* @_ZTIN5test51AE to i8*))
}
namespace test6 {
template <class T> struct allocator {
~allocator() throw() { }
};
void foo() {
allocator<int> a;
}
}
// PR7127
namespace test7 {
// CHECK: define i32 @_ZN5test73fooEv()
int foo() {
// CHECK: [[CAUGHTEXNVAR:%.*]] = alloca i8*
// CHECK-NEXT: [[SELECTORVAR:%.*]] = alloca i32
// CHECK-NEXT: [[INTCATCHVAR:%.*]] = alloca i32
try {
try {
// CHECK-NEXT: [[EXNALLOC:%.*]] = call i8* @__cxa_allocate_exception
// CHECK-NEXT: bitcast i8* [[EXNALLOC]] to i32*
// CHECK-NEXT: store i32 1, i32*
// CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXNALLOC]], i8* bitcast (i8** @_ZTIi to i8*), i8* null
throw 1;
}
// CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
// CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
// CHECK-NEXT: catch i8* null
// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
// CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
// CHECK-NEXT: br label
// CHECK: [[SELECTOR:%.*]] = load i32* [[SELECTORVAR]]
// CHECK-NEXT: [[T0:%.*]] = call i32 @llvm.eh.typeid.for(i8* bitcast (i8** @_ZTIi to i8*))
// CHECK-NEXT: icmp eq i32 [[SELECTOR]], [[T0]]
// CHECK-NEXT: br i1
// CHECK: [[T0:%.*]] = load i8** [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[T1:%.*]] = call i8* @__cxa_begin_catch(i8* [[T0]])
// CHECK-NEXT: [[T2:%.*]] = bitcast i8* [[T1]] to i32*
// CHECK-NEXT: [[T3:%.*]] = load i32* [[T2]]
// CHECK-NEXT: store i32 [[T3]], i32* {{%.*}}, align 4
// CHECK-NEXT: invoke void @__cxa_rethrow
catch (int) {
throw;
}
}
// CHECK: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
// CHECK-NEXT: catch i8* null
// CHECK-NEXT: [[CAUGHTEXN:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
// CHECK-NEXT: store i8* [[CAUGHTEXN]], i8** [[CAUGHTEXNVAR]]
// CHECK-NEXT: [[SELECTOR:%.*]] = extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
// CHECK-NEXT: store i32 [[SELECTOR]], i32* [[SELECTORVAR]]
// CHECK-NEXT: call void @__cxa_end_catch()
// CHECK-NEXT: br label
// CHECK: load i8** [[CAUGHTEXNVAR]]
// CHECK-NEXT: call i8* @__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: define void @_ZN5test83fooEv()
void foo() {
try {
// CHECK: invoke void @_ZN5test83barEv()
bar();
} catch (A a) {
// CHECK: call i8* @__cxa_get_exception_ptr
// CHECK-NEXT: bitcast
// CHECK-NEXT: invoke void @_ZN5test81AC1ERKS0_(
// CHECK: call i8* @__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: define void @_ZN5test91AC1Ev(%"struct.test9::A"* %this) unnamed_addr
// CHECK: call void @_ZN5test91AC2Ev
// CHECK-NEXT: ret void
// CHECK: define void @_ZN5test91AC2Ev(%"struct.test9::A"* %this) unnamed_addr
A::A() try {
// CHECK: invoke void @_ZN5test96opaqueEv()
opaque();
} catch (int x) {
// CHECK: landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
// CHECK-NEXT: catch i8* bitcast (i8** @_ZTIi to i8*)
// CHECK: call i8* @__cxa_begin_catch
// CHECK: invoke void @_ZN5test96opaqueEv()
// CHECK: invoke void @__cxa_rethrow()
opaque();
}
}
// __cxa_end_catch can throw for some kinds of caught exceptions.
namespace test10 {
void opaque();
struct A { ~A(); };
struct B { int x; };
// CHECK: define void @_ZN6test103fooEv()
void foo() {
A a; // force a cleanup context
try {
// CHECK: invoke void @_ZN6test106opaqueEv()
opaque();
} catch (int i) {
// CHECK: call i8* @__cxa_begin_catch
// CHECK-NEXT: bitcast
// CHECK-NEXT: load i32*
// CHECK-NEXT: store i32
// CHECK-NEXT: call void @__cxa_end_catch() nounwind
} catch (B a) {
// CHECK: call i8* @__cxa_begin_catch
// CHECK-NEXT: bitcast
// CHECK-NEXT: bitcast
// CHECK-NEXT: bitcast
// CHECK-NEXT: call void @llvm.memcpy
// CHECK-NEXT: invoke void @__cxa_end_catch()
} catch (...) {
// CHECK: call i8* @__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: define void @_ZN6test113fooEv()
void foo() {
try {
// CHECK: invoke void @_ZN6test116opaqueEv()
opaque();
} catch (int**&p) {
// CHECK: [[EXN:%.*]] = load i8**
// CHECK-NEXT: call i8* @__cxa_begin_catch(i8* [[EXN]]) nounwind
// CHECK-NEXT: [[ADJ1:%.*]] = getelementptr i8* [[EXN]], i32 32
// CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to i32***
// CHECK-NEXT: store i32*** [[ADJ2]], i32**** [[P:%.*]]
// CHECK-NEXT: call void @__cxa_end_catch() nounwind
}
}
struct A {};
// CHECK: define void @_ZN6test113barEv()
void bar() {
try {
// CHECK: [[EXNSLOT:%.*]] = alloca i8*
// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
// CHECK-NEXT: [[P:%.*]] = alloca [[A:%.*]]**,
// CHECK-NEXT: [[TMP:%.*]] = alloca [[A]]*
// CHECK-NEXT: invoke void @_ZN6test116opaqueEv()
opaque();
} catch (A*&p) {
// CHECK: [[EXN:%.*]] = load i8** [[EXNSLOT]]
// CHECK-NEXT: [[ADJ1:%.*]] = call i8* @__cxa_begin_catch(i8* [[EXN]]) nounwind
// CHECK-NEXT: [[ADJ2:%.*]] = bitcast i8* [[ADJ1]] to [[A]]*
// CHECK-NEXT: store [[A]]* [[ADJ2]], [[A]]** [[TMP]]
// CHECK-NEXT: store [[A]]** [[TMP]], [[A]]*** [[P]]
// CHECK-NEXT: call void @__cxa_end_catch() nounwind
}
}
}
// PR7686
namespace test12 {
struct A { ~A() noexcept(false); };
bool opaque(const A&);
// CHECK: 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 zeroext i1 @_ZN6test126opaqueERKNS_1AE(
if (opaque(x)) {
A y;
A z;
// CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Z]])
// CHECK: invoke void @_ZN6test121AD1Ev([[A]]* [[Y]])
// CHECK-NOT: switch
goto success;
}
success:
bool _ = true;
// CHECK: call void @_ZN6test121AD1Ev([[A]]* [[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: define void @_ZN6test153fooEv()
void foo() {
A a;
try {
// CHECK: [[X:%.*]] = alloca i32
// CHECK: store i32 10, i32* [[X]]
// CHECK-NEXT: br label
// -> while.cond
int x = 10;
while (true) {
// CHECK: load i32* [[X]]
// CHECK-NEXT: [[COND:%.*]] = invoke 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: define void @_ZN6test163barEv()
void bar() {
// CHECK: [[EXN_SAVE:%.*]] = alloca i8*
// CHECK-NEXT: [[EXN_ACTIVE:%.*]] = alloca i1
// CHECK-NEXT: [[TEMP:%.*]] = alloca [[A:%.*]],
// CHECK-NEXT: [[EXNSLOT:%.*]] = alloca i8*
// CHECK-NEXT: [[SELECTORSLOT:%.*]] = alloca i32
// CHECK-NEXT: [[TEMP_ACTIVE:%.*]] = alloca i1
cond() ? throw B(A()) : foo();
// CHECK-NEXT: [[COND:%.*]] = call zeroext i1 @_ZN6test164condEv()
// CHECK-NEXT: store i1 false, i1* [[EXN_ACTIVE]]
// CHECK-NEXT: store i1 false, i1* [[TEMP_ACTIVE]]
// CHECK-NEXT: br i1 [[COND]],
// CHECK: [[EXN:%.*]] = call i8* @__cxa_allocate_exception(i64 4)
// CHECK-NEXT: store i8* [[EXN]], i8** [[EXN_SAVE]]
// CHECK-NEXT: store i1 true, i1* [[EXN_ACTIVE]]
// CHECK-NEXT: [[T0:%.*]] = bitcast i8* [[EXN]] to [[B:%.*]]*
// CHECK-NEXT: invoke void @_ZN6test161AC1Ev([[A]]* [[TEMP]])
// CHECK: store i1 true, i1* [[TEMP_ACTIVE]]
// CHECK-NEXT: invoke void @_ZN6test161BC1ERKNS_1AE([[B]]* [[T0]], [[A]]* [[TEMP]])
// CHECK: store i1 false, i1* [[EXN_ACTIVE]]
// CHECK-NEXT: invoke void @__cxa_throw(i8* [[EXN]],
// CHECK: invoke void @_ZN6test163fooEv()
// CHECK: br label
// CHECK: invoke void @_ZN6test161AD1Ev([[A]]* [[TEMP]])
// CHECK: ret void
// CHECK: [[T0:%.*]] = load i1* [[EXN_ACTIVE]]
// CHECK-NEXT: br i1 [[T0]]
// CHECK: [[T1:%.*]] = load i8** [[EXN_SAVE]]
// CHECK-NEXT: call void @__cxa_free_exception(i8* [[T1]])
// CHECK-NEXT: br label
}
}
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