Add basic test that we perform lifetime extension in the expected

situations.

llvm-svn: 344800

1 files changed, 190 insertions, 0 deletions

diff --git a/clang/test/CXX/special/class.temporary/p6.cpp b/clang/test/CXX/special/class.temporary/p6.cpp
new file mode 100644
index 00000000000..e8680902165
--- /dev/null
+++ b/clang/test/CXX/special/class.temporary/p6.cpp
@@ -0,0 +1,190 @@
+// RUN: %clang_cc1 -std=c++17 %s -emit-llvm -o - | FileCheck %s --implicit-check-not='call{{.*}}dtor'
+
+void then();
+
+struct dtor {
+  ~dtor();
+};
+
+dtor ctor();
+
+// [lifetime extension occurs if the object was obtained by]
+//  -- a temporary materialization conversion
+// CHECK-LABEL: ref_binding
+void ref_binding() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = ctor();
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+
+//  -- ( expression )
+// CHECK-LABEL: parens
+void parens() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = ctor();
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+
+//  -- subscripting of an array
+// CHECK-LABEL: array_subscript_1
+void array_subscript_1() {
+  using T = dtor[1];
+  // CHECK: call {{.*}}ctor
+  auto &&x = T{ctor()}[0];
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+// CHECK-LABEL: array_subscript_2
+void array_subscript_2() {
+  using T = dtor[1];
+  // CHECK: call {{.*}}ctor
+  auto &&x = ((dtor*)T{ctor()})[0];
+  // CHECK: call {{.*}}dtor
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: }
+}
+
+struct with_member { dtor d; ~with_member(); };
+struct with_ref_member { dtor &&d; ~with_ref_member(); };
+
+//  -- a class member access using the . operator [...]
+// CHECK-LABEL: member_access_1
+void member_access_1() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = with_member{ctor()}.d;
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}with_member
+  // CHECK: }
+}
+// CHECK-LABEL: member_access_2
+void member_access_2() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = with_ref_member{ctor()}.d;
+  // CHECK: call {{.*}}with_ref_member
+  // CHECK: call {{.*}}dtor
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: }
+}
+// CHECK-LABEL: member_access_3
+void member_access_3() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = (&(const with_member&)with_member{ctor()})->d;
+  // CHECK: call {{.*}}with_member
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: }
+}
+
+//  -- a pointer-to-member operation using the .* operator [...]
+// CHECK-LABEL: member_ptr_access_1
+void member_ptr_access_1() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = with_member{ctor()}.*&with_member::d;
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}with_member
+  // CHECK: }
+}
+// CHECK-LABEL: member_ptr_access_2
+void member_ptr_access_2() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = (&(const with_member&)with_member{ctor()})->*&with_member::d;
+  // CHECK: call {{.*}}with_member
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: }
+}
+
+//  -- a [named] cast [...]
+// CHECK-LABEL: static_cast
+void test_static_cast() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = static_cast<dtor&&>(ctor());
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+// CHECK-LABEL: const_cast
+void test_const_cast() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = const_cast<dtor&&>(ctor());
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+// CHECK-LABEL: reinterpret_cast
+void test_reinterpret_cast() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = reinterpret_cast<dtor&&>(static_cast<dtor&&>(ctor()));
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+// CHECK-LABEL: dynamic_cast
+void test_dynamic_cast() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = dynamic_cast<dtor&&>(ctor());
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+
+//  -- [explicit cast notation is defined in terms of the above]
+// CHECK-LABEL: c_style_cast
+void c_style_cast() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = (dtor&&)ctor();
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+// CHECK-LABEL: function_style_cast
+void function_style_cast() {
+  // CHECK: call {{.*}}ctor
+  using R = dtor&&;
+  auto &&x = R(ctor());
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+
+//  -- a conditional operator
+// CHECK-LABEL: conditional
+void conditional(bool b) {
+  // CHECK: call {{.*}}ctor
+  // CHECK: call {{.*}}ctor
+  auto &&x = b ? (dtor&&)ctor() : (dtor&&)ctor();
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}
+
+//  -- a comma expression
+// CHECK-LABEL: comma
+void comma() {
+  // CHECK: call {{.*}}ctor
+  auto &&x = (true, (dtor&&)ctor());
+  // CHECK: call {{.*}}then
+  then();
+  // CHECK: call {{.*}}dtor
+  // CHECK: }
+}