52 lines · cpp
1// 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.lifetime2 3class S {4 char *ptr;5 unsigned int len;6};7 8class T {9 S left;10 S right;11 12public:13 T(const char s[]);14 T(S);15 16 T concat(const T &Suffix) const;17 const char * str() const;18};19 20const char * f(S s)21{22// It's essential that the lifetimes of all three T temporaries here are23// overlapping. They must all remain alive through the call to str().24//25// CHECK: [[T1:%.*]] = alloca %class.T, align 426// CHECK: [[T2:%.*]] = alloca %class.T, align 427// CHECK: [[T3:%.*]] = alloca %class.T, align 428//29// FIXME: We could defer starting the lifetime of the return object of concat30// until the call.31// CHECK: call void @llvm.lifetime.start.p0(ptr [[T1]])32//33// CHECK: call void @llvm.lifetime.start.p0(ptr [[T2]])34// CHECK: [[T4:%.*]] = call noundef ptr @_ZN1TC1EPKc(ptr {{[^,]*}} [[T2]], ptr noundef @.str)35//36// CHECK: call void @llvm.lifetime.start.p0(ptr [[T3]])37// CHECK: [[T5:%.*]] = call noundef ptr @_ZN1TC1E1S(ptr {{[^,]*}} [[T3]], [2 x i32] %{{.*}})38//39// CHECK: call void @_ZNK1T6concatERKS_(ptr dead_on_unwind writable sret(%class.T) align 4 [[T1]], ptr {{[^,]*}} [[T2]], ptr noundef nonnull align 4 dereferenceable(16) [[T3]])40// CHECK: [[T6:%.*]] = call noundef ptr @_ZNK1T3strEv(ptr {{[^,]*}} [[T1]])41//42// CHECK: call void @llvm.lifetime.end.p0(43// CHECK: call void @llvm.lifetime.end.p0(44// CHECK: call void @llvm.lifetime.end.p0(45// CHECK: ret ptr [[T6]]46 47 return T("[").concat(T(s)).str();48}49 50// CHECK: declare {{.*}}llvm.lifetime.start51// CHECK: declare {{.*}}llvm.lifetime.end52