forked from OSchip/llvm-project
55 lines
1.8 KiB
C++
55 lines
1.8 KiB
C++
// RUN: %clang_cc1 -triple armv7l-unknown-linux-gnueabihf -emit-llvm -O1 -disable-llvm-passes -std=c++03 %s -o - | FileCheck %s --implicit-check-not=llvm.lifetime
|
|
|
|
class S {
|
|
char *ptr;
|
|
unsigned int len;
|
|
};
|
|
|
|
class T {
|
|
S left;
|
|
S right;
|
|
|
|
public:
|
|
T(const char s[]);
|
|
T(S);
|
|
|
|
T concat(const T &Suffix) const;
|
|
const char * str() const;
|
|
};
|
|
|
|
const char * f(S s)
|
|
{
|
|
// It's essential that the lifetimes of all three T temporaries here are
|
|
// overlapping. They must all remain alive through the call to str().
|
|
//
|
|
// CHECK: [[T1:%.*]] = alloca %class.T, align 4
|
|
// CHECK: [[T2:%.*]] = alloca %class.T, align 4
|
|
// CHECK: [[T3:%.*]] = alloca %class.T, align 4
|
|
//
|
|
// FIXME: We could defer starting the lifetime of the return object of concat
|
|
// until the call.
|
|
// CHECK: [[T1i8:%.*]] = bitcast %class.T* [[T1]] to i8*
|
|
// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T1i8]])
|
|
//
|
|
// CHECK: [[T2i8:%.*]] = bitcast %class.T* [[T2]] to i8*
|
|
// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T2i8]])
|
|
// CHECK: [[T4:%.*]] = call %class.T* @_ZN1TC1EPKc(%class.T* [[T2]], i8* getelementptr inbounds ([2 x i8], [2 x i8]* @.str, i32 0, i32 0))
|
|
//
|
|
// CHECK: [[T3i8:%.*]] = bitcast %class.T* [[T3]] to i8*
|
|
// CHECK: call void @llvm.lifetime.start.p0i8(i64 16, i8* [[T3i8]])
|
|
// CHECK: [[T5:%.*]] = call %class.T* @_ZN1TC1E1S(%class.T* [[T3]], [2 x i32] %{{.*}})
|
|
//
|
|
// CHECK: call void @_ZNK1T6concatERKS_(%class.T* sret [[T1]], %class.T* [[T2]], %class.T* dereferenceable(16) [[T3]])
|
|
// CHECK: [[T6:%.*]] = call i8* @_ZNK1T3strEv(%class.T* [[T1]])
|
|
//
|
|
// CHECK: call void @llvm.lifetime.end.p0i8(
|
|
// CHECK: call void @llvm.lifetime.end.p0i8(
|
|
// CHECK: call void @llvm.lifetime.end.p0i8(
|
|
// CHECK: ret i8* [[T6]]
|
|
|
|
return T("[").concat(T(s)).str();
|
|
}
|
|
|
|
// CHECK: declare {{.*}}llvm.lifetime.start
|
|
// CHECK: declare {{.*}}llvm.lifetime.end
|