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// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -O1 -o - %s | FileCheck %s
// RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -O1 -fcxx-exceptions -fexceptions -o - %s | FileCheck --check-prefix=CHECK-EH %s
// Test code generation for the named return value optimization.
class X {
public:
X();
X(const X&);
~X();
};
template<typename T> struct Y {
Y();
static Y f() {
Y y;
return y;
}
};
// CHECK-LABEL: define void @_Z5test0v
// CHECK-EH-LABEL: define void @_Z5test0v
X test0() {
X x;
// CHECK: call {{.*}} @_ZN1XC1Ev
// CHECK-NEXT: ret void
// CHECK-EH: call {{.*}} @_ZN1XC1Ev
// CHECK-EH-NEXT: ret void
return x;
}
// CHECK-LABEL: define void @_Z5test1b(
// CHECK-EH-LABEL: define void @_Z5test1b(
X test1(bool B) {
// CHECK: tail call {{.*}} @_ZN1XC1Ev
// CHECK-NEXT: ret void
X x;
if (B)
return (x);
return x;
// CHECK-EH: tail call {{.*}} @_ZN1XC1Ev
// CHECK-EH-NEXT: ret void
}
// CHECK-LABEL: define void @_Z5test2b
// CHECK-EH-LABEL: define void @_Z5test2b
X test2(bool B) {
// No NRVO.
X x;
X y;
if (B)
return y;
return x;
// CHECK: call {{.*}} @_ZN1XC1Ev
// CHECK-NEXT: call {{.*}} @_ZN1XC1Ev
// CHECK: call {{.*}} @_ZN1XC1ERKS_
// CHECK: call {{.*}} @_ZN1XC1ERKS_
// CHECK: call {{.*}} @_ZN1XD1Ev
// CHECK: call {{.*}} @_ZN1XD1Ev
// CHECK: ret void
// The block ordering in the -fexceptions IR is unfortunate.
// CHECK-EH: call {{.*}} @_ZN1XC1Ev
// CHECK-EH-NEXT: invoke {{.*}} @_ZN1XC1Ev
// -> %invoke.cont, %lpad
// %invoke.cont:
// CHECK-EH: br i1
// -> %if.then, %if.end
// %if.then: returning 'x'
// CHECK-EH: invoke {{.*}} @_ZN1XC1ERKS_
// -> %cleanup, %lpad1
// %lpad: landing pad for ctor of 'y', dtor of 'y'
// CHECK-EH: [[CAUGHTVAL:%.*]] = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
// CHECK-EH-NEXT: cleanup
// CHECK-EH-NEXT: extractvalue { i8*, i32 } [[CAUGHTVAL]], 0
// CHECK-EH-NEXT: extractvalue { i8*, i32 } [[CAUGHTVAL]], 1
// CHECK-EH-NEXT: br label
// -> %eh.cleanup
// %lpad1: landing pad for return copy ctors, EH cleanup for 'y'
// CHECK-EH: invoke {{.*}} @_ZN1XD1Ev
// -> %eh.cleanup, %terminate.lpad
// %if.end: returning 'y'
// CHECK-EH: invoke {{.*}} @_ZN1XC1ERKS_
// -> %cleanup, %lpad1
// %cleanup: normal cleanup for 'y'
// CHECK-EH: invoke {{.*}} @_ZN1XD1Ev
// -> %invoke.cont11, %lpad
// %invoke.cont11: normal cleanup for 'x'
// CHECK-EH: call {{.*}} @_ZN1XD1Ev
// CHECK-EH-NEXT: ret void
// %eh.cleanup: EH cleanup for 'x'
// CHECK-EH: invoke {{.*}} @_ZN1XD1Ev
// -> %invoke.cont17, %terminate.lpad
// %invoke.cont17: rethrow block for %eh.cleanup.
// This really should be elsewhere in the function.
// CHECK-EH: resume { i8*, i32 }
// %terminate.lpad: terminate landing pad.
// CHECK-EH: [[T0:%.*]] = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__gxx_personality_v0 to i8*)
// CHECK-EH-NEXT: catch i8* null
// CHECK-EH-NEXT: [[T1:%.*]] = extractvalue { i8*, i32 } [[T0]], 0
// CHECK-EH-NEXT: call void @__clang_call_terminate(i8* [[T1]]) [[NR_NUW:#[0-9]+]]
// CHECK-EH-NEXT: unreachable
}
// CHECK-LABEL: define void @_Z5test3b
X test3(bool B) {
// CHECK: tail call {{.*}} @_ZN1XC1Ev
// CHECK-NOT: call {{.*}} @_ZN1XC1ERKS_
// CHECK: call {{.*}} @_ZN1XC1Ev
// CHECK: call {{.*}} @_ZN1XC1ERKS_
if (B) {
X y;
return y;
}
// FIXME: we should NRVO this variable too.
X x;
return x;
}
extern "C" void exit(int) throw();
// CHECK-LABEL: define void @_Z5test4b
X test4(bool B) {
{
// CHECK: tail call {{.*}} @_ZN1XC1Ev
X x;
// CHECK: br i1
if (B)
return x;
}
// CHECK: tail call {{.*}} @_ZN1XD1Ev
// CHECK: tail call void @exit(i32 1)
exit(1);
}
#ifdef __EXCEPTIONS
// CHECK-EH-LABEL: define void @_Z5test5
void may_throw();
X test5() {
try {
may_throw();
} catch (X x) {
// CHECK-EH: invoke {{.*}} @_ZN1XC1ERKS_
// CHECK-EH: call void @__cxa_end_catch()
// CHECK-EH: ret void
return x;
}
}
#endif
// rdar://problem/10430868
// CHECK-LABEL: define void @_Z5test6v
X test6() {
X a __attribute__((aligned(8)));
return a;
// CHECK: [[A:%.*]] = alloca [[X:%.*]], align 8
// CHECK-NEXT: call {{.*}} @_ZN1XC1Ev([[X]]* [[A]])
// CHECK-NEXT: call {{.*}} @_ZN1XC1ERKS_([[X]]* {{%.*}}, [[X]]* dereferenceable({{[0-9]+}}) [[A]])
// CHECK-NEXT: call {{.*}} @_ZN1XD1Ev([[X]]* [[A]])
// CHECK-NEXT: ret void
}
// CHECK-LABEL: define void @_Z5test7b
X test7(bool b) {
// CHECK: tail call {{.*}} @_ZN1XC1Ev
// CHECK-NEXT: ret
if (b) {
X x;
return x;
}
return X();
}
// CHECK-LABEL: define void @_Z5test8b
X test8(bool b) {
// CHECK: tail call {{.*}} @_ZN1XC1Ev
// CHECK-NEXT: ret
if (b) {
X x;
return x;
} else {
X y;
return y;
}
}
Y<int> test9() {
Y<int>::f();
}
// CHECK-LABEL: define linkonce_odr void @_ZN1YIiE1fEv
// CHECK: tail call {{.*}} @_ZN1YIiEC1Ev
// CHECK-EH: attributes [[NR_NUW]] = { noreturn nounwind }
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