230 lines
7.2 KiB
C++
230 lines
7.2 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -Wpessimizing-move -std=c++11 -verify %s
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// RUN: %clang_cc1 -fsyntax-only -Wpessimizing-move -std=c++11 -fdiagnostics-parseable-fixits %s 2>&1 | FileCheck %s
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// definitions for std::move
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namespace std {
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inline namespace foo {
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template <class T> struct remove_reference { typedef T type; };
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template <class T> struct remove_reference<T&> { typedef T type; };
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template <class T> struct remove_reference<T&&> { typedef T type; };
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template <class T> typename remove_reference<T>::type &&move(T &&t);
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}
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}
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struct A {};
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struct B {
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B() {}
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B(A) {}
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};
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A test1(A a1) {
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A a2;
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return a1;
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return a2;
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return std::move(a1);
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return std::move(a2);
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:23}:""
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}
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B test2(A a1, B b1) {
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// Object is different than return type so don't warn.
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A a2;
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return a1;
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return a2;
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return std::move(a1);
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return std::move(a2);
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B b2;
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return b1;
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return b2;
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return std::move(b1);
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return std::move(b2);
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:23}:""
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}
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A global_a;
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A test3() {
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// Don't warn when object is not local.
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return global_a;
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return std::move(global_a);
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static A static_a;
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return static_a;
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return std::move(static_a);
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}
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A test4() {
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return A();
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return test3();
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return std::move(A());
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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return std::move(test3());
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:27-[[@LINE-4]]:28}:""
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}
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void test5(A) {
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test5(A());
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test5(test4());
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test5(std::move(A()));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:9-[[@LINE-3]]:19}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:23}:""
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test5(std::move(test4()));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:9-[[@LINE-3]]:19}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:26-[[@LINE-4]]:27}:""
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}
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void test6() {
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A a1 = A();
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A a2 = test3();
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A a3 = std::move(A());
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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A a4 = std::move(test3());
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:27-[[@LINE-4]]:28}:""
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}
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A test7() {
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A a1 = std::move(A());
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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A a2 = std::move((A()));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:25-[[@LINE-4]]:26}:""
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A a3 = (std::move(A()));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:11-[[@LINE-3]]:21}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:24-[[@LINE-4]]:25}:""
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A a4 = (std::move((A())));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:11-[[@LINE-3]]:21}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:26-[[@LINE-4]]:27}:""
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return std::move(a1);
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:22-[[@LINE-4]]:23}:""
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return std::move((a1));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:24-[[@LINE-4]]:25}:""
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return (std::move(a1));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:11-[[@LINE-3]]:21}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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return (std::move((a1)));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:11-[[@LINE-3]]:21}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:25-[[@LINE-4]]:26}:""
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}
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#define wrap1(x) x
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#define wrap2(x) x
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// Macro test. Since the std::move call is outside the macro, it is
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// safe to suggest a fix-it.
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A test8() {
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A a;
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return std::move(a);
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:21-[[@LINE-4]]:22}:""
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return std::move(wrap1(a));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:28-[[@LINE-4]]:29}:""
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return std::move(wrap1(wrap2(a)));
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:10-[[@LINE-3]]:20}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:35-[[@LINE-4]]:36}:""
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}
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#define test9 \
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A test9() { \
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A a; \
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return std::move(a); \
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}
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// Macro test. The std::call is inside the macro, so no fix-it is suggested.
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test9
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// expected-warning@-1{{prevents copy elision}}
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// CHECK-NOT: fix-it
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#define return_a return std::move(a)
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// Macro test. The std::call is inside the macro, so no fix-it is suggested.
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A test10() {
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A a;
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return_a;
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// expected-warning@-1{{prevents copy elision}}
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// CHECK-NOT: fix-it
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}
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namespace templates {
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struct A {};
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struct B { B(A); };
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// Warn once here since the type is not dependent.
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template <typename T>
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A test1() {
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A a;
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return std::move(a);
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// expected-warning@-1{{prevents copy elision}}
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// expected-note@-2{{remove std::move call}}
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// CHECK: fix-it:"{{.*}}":{[[@LINE-3]]:12-[[@LINE-3]]:22}:""
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// CHECK: fix-it:"{{.*}}":{[[@LINE-4]]:23-[[@LINE-4]]:24}:""
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}
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void run_test1() {
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test1<A>();
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test1<B>();
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}
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// T1 and T2 may not be the same, the warning may not always apply.
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template <typename T1, typename T2>
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T1 test2() {
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T2 t;
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return std::move(t);
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}
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void run_test2() {
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test2<A, A>();
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test2<B, A>();
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}
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}
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