251 lines · cpp
1// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,pedantic,override,reorder -pedantic-errors2// RUN: %clang_cc1 -std=c++17 %s -verify=expected,pedantic,override,reorder -Wno-c++20-designator -pedantic-errors3// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,pedantic -Werror=c99-designator -Wno-reorder-init-list -Wno-initializer-overrides4// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,reorder -Wno-c99-designator -Werror=reorder-init-list -Wno-initializer-overrides5// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,override -Wno-c99-designator -Wno-reorder-init-list -Werror=initializer-overrides6// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected -Wno-c99-designator -Wno-reorder-init-list -Wno-initializer-overrides7// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,wmissing,wmissing-designated -Wmissing-field-initializers -Wno-c99-designator -Wno-reorder-init-list -Wno-initializer-overrides8// RUN: %clang_cc1 -std=c++20 %s -verify=cxx20,expected,wmissing -Wmissing-field-initializers -Wno-missing-designated-field-initializers -Wno-c99-designator -Wno-reorder-init-list -Wno-initializer-overrides9 10 11namespace class_with_ctor {12 struct A { // cxx20-note 6{{candidate}}13 A() = default; // cxx20-note 3{{candidate}}14 int x;15 int y;16 };17 A a = {1, 2}; // cxx20-error {{no matching constructor}}18 19 struct B {20 int x;21 int y;22 };23 B b1 = B(); // trigger declaration of implicit ctors24 B b2 = {1, 2}; // ok25 26 struct C : A {27 A a;28 };29 C c1 = {{}, {}}; // ok, call default ctor twice30 C c2 = {{1, 2}, {3, 4}}; // cxx20-error 2{{no matching constructor}}31}32 33namespace designator {34struct A { int x, y; };35struct B { A a; };36 37A a1 = {38 .y = 1, // reorder-note {{previous initialization for field 'y' is here}}39 .x = 2 // reorder-error {{ISO C++ requires field designators to be specified in declaration order; field 'y' will be initialized after field 'x'}}40};41int arr[3] = {[1] = 5}; // pedantic-error {{array designators are a C99 extension}}42B b = {.a.x = 0}; // pedantic-error {{nested designators are a C99 extension}}43A a2 = {44 .x = 1, // pedantic-error {{mixture of designated and non-designated initializers in the same initializer list is a C99 extension}}45 2 // pedantic-note {{first non-designated initializer is here}}46};47A a3 = {48 1, // pedantic-note {{first non-designated initializer is here}}49 .y = 2 // pedantic-error {{mixture of designated and non-designated initializers in the same initializer list is a C99 extension}}50};51A a4 = {52 .x = 1, // override-note {{previous}}53 .x = 1 // override-error {{overrides prior initialization}}54}; // wmissing-designated-warning {{missing field 'y' initializer}}55A a5 = {56 .y = 1, // override-note {{previous}}57 .y = 1 // override-error {{overrides prior initialization}}58}; // wmissing-designated-warning {{missing field 'x' initializer}}59B b2 = {.a = 1}; // pedantic-error {{brace elision for designated initializer is a C99 extension}}60 // wmissing-warning@-1 {{missing field 'y' initializer}}61B b3 = {.a = 1, 2}; // pedantic-error {{mixture of designated and non-designated}} pedantic-note {{first non-designated}} pedantic-error {{brace elision}}62B b4 = {.a = 1, 2, 3}; // pedantic-error {{mixture of designated and non-designated}} pedantic-note {{first non-designated}} pedantic-error {{brace elision}} expected-error {{excess elements}}63B b5 = {.a = nullptr}; // expected-error {{cannot initialize}}64 // wmissing-warning@-1 {{missing field 'y' initializer}}65struct C { int :0, x, :0, y, :0; };66C c = {67 .x = 1, // override-note {{previous}}68 .x = 1, // override-error {{overrides prior initialization}} override-note {{previous}}69 .y = 1, // override-note {{previous}}70 .y = 1, // override-error {{overrides prior initialization}} // reorder-note {{previous initialization for field 'y' is here}}71 .x = 1, // reorder-error {{declaration order}} override-error {{overrides prior initialization}} override-note {{previous}}72 .x = 1, // override-error {{overrides prior initialization}}73};74 75struct Foo { int a, b; };76 77struct Foo foo0 = { 1 }; // wmissing-warning {{missing field 'b' initializer}}78struct Foo foo1 = { .a = 1 }; // wmissing-designated-warning {{missing field 'b' initializer}}79struct Foo foo2 = { .b = 1 }; // wmissing-designated-warning {{missing field 'a' initializer}}80 81}82 83namespace base_class {84 struct base {85 int x;86 };87 struct derived : base {88 int y;89 };90 derived d = {.x = 1, .y = 2}; // expected-error {{'x' does not refer to any field}}91}92 93namespace union_ {94 union U { int a, b; };95 U u = {96 .a = 1, // override-note {{here}}97 .b = 2, // override-error {{overrides prior}}98 };99}100 101namespace overload_resolution {102 struct A { int x, y; };103 union B { int x, y; };104 105 void f(A a);106 void f(B b) = delete;107 void g() { f({.x = 1, .y = 2}); } // ok, calls non-union overload108 109 // As an extension of the union case, overload resolution won't pick any110 // candidate where a field initializer would be overridden.111 struct A2 { int x, other, y; };112 int f(A2);113 void g2() { int k = f({.x = 1, 2, .y = 3}); (void)k; } // pedantic-error {{mixture of designated and non-designated}} pedantic-note {{here}}114 115 struct C { int x; };116 void h(A a); // expected-note {{candidate}}117 void h(C c); // expected-note {{candidate}}118 void i() {119 h({.x = 1, .y = 2});120 h({.y = 1, .x = 2}); // reorder-error {{declaration order}} reorder-note {{previous}}121 h({.x = 1}); // expected-error {{ambiguous}}122 }123 124 struct D { int y, x; };125 void j(A a); // expected-note {{candidate}}126 void j(D d); // expected-note {{candidate}}127 void k() {128 j({.x = 1, .y = 2}); // expected-error {{ambiguous}}129 }130 131 struct E { A a; };132 struct F { int a; };133 void l(E e); // expected-note {{candidate}}134 int &l(F f); // expected-note {{candidate}}135 void m() {136 int &r = l({.a = 0}); // ok, l(E) is not viable137 int &s = l({.a = {0}}); // expected-error {{ambiguous}}138 }139}140 141namespace deduction {142 struct A { int x, y; };143 union B { int x, y; };144 145 template<typename T, typename U> void f(decltype(T{.x = 1, .y = 2}) = {});146 template<typename T, typename U> void f(decltype(U{.x = 1, .y = 2}) = {}) = delete;147 void g() { f<A, B>(); } // ok, calls non-union overload148 149 struct C { int y, x; };150 template<typename T, typename U> void h(decltype(T{.y = 1, .x = 2}) = {}) = delete;151 template<typename T, typename U> void h(decltype(U{.y = 1, .x = 2}) = {});152 void i() {153 h<A, C>(); // ok, selects C overload by SFINAE154 }155 156 struct D { int n; };157 struct E { D n; };158 template<typename T, typename U> void j1(decltype(T{.n = 0}));159 template<typename T, typename U> void j1(decltype(U{.n = 0})) = delete;160 template<typename T, typename U> void j2(decltype(T{.n = {0}})); // expected-note {{candidate}}161 template<typename T, typename U> void j2(decltype(U{.n = {0}})); // expected-note {{candidate}}162 template<typename T, typename U> void j3(decltype(T{.n = {{0}}})) = delete;163 template<typename T, typename U> void j3(decltype(U{.n = {{0}}}));164 void k() {165 j1<D, E>({}); // ok, selects D overload by SFINAE (too few braces for E)166 j2<D, E>({}); // expected-error {{ambiguous}}167 j3<D, E>({}); // ok, selects E overload by SFINAE (too many braces for D)168 }169}170 171namespace no_unwrap {172 template<typename T> struct X {173 static_assert(false, "should not be instantiated");174 };175 struct Q {176 template<typename T, typename U = typename X<T>::type> Q(T&&);177 };178 179 // Ensure that we do not try to call 'Q::Q(.a = 1)' here.180 void g() { Q q = {.a = 1}; } // expected-error {{initialization of non-aggregate type 'Q' with a designated initializer list}}181 182 struct S { int a; };183 void h(Q q);184 void h(S s);185 186 // OK, does not instantiate X<void&> (!).187 void i() {188 h({.a = 1});189 }190}191 192namespace GH63605 {193struct A {194 unsigned x;195 unsigned y;196 unsigned z;197};198 199struct B {200 unsigned a;201 unsigned b;202};203 204struct : public A, public B {205 unsigned : 2;206 unsigned a : 6;207 unsigned : 1;208 unsigned b : 6;209 unsigned : 2;210 unsigned c : 6;211 unsigned d : 1;212 unsigned e : 2;213} data = {214 {.z=0,215 // pedantic-note@-1 {{first non-designated initializer is here}}216 // reorder-note@-2 {{previous initialization for field 'z' is here}}217 .y=1, // reorder-error {{field 'z' will be initialized after field 'y'}}218 // reorder-note@-1 {{previous initialization for field 'y' is here}}219 .x=2}, // reorder-error {{field 'y' will be initialized after field 'x'}}220 {.b=3, // reorder-note {{previous initialization for field 'b' is here}}221 .a=4}, // reorder-error {{field 'b' will be initialized after field 'a'}}222 .e = 1, // reorder-note {{previous initialization for field 'e' is here}}223 // pedantic-error@-1 {{mixture of designated and non-designated initializers in the same initializer list is a C99 extension}}224 .d = 1, // reorder-error {{field 'e' will be initialized after field 'd'}}225 // reorder-note@-1 {{previous initialization for field 'd' is here}}226 .c = 1, // reorder-error {{field 'd' will be initialized after field 'c'}} // reorder-note {{previous initialization for field 'c' is here}}227 .b = 1, // reorder-error {{field 'c' will be initialized after field 'b'}} // reorder-note {{previous initialization for field 'b' is here}}228 .a = 1, // reorder-error {{field 'b' will be initialized after field 'a'}}229};230}231 232namespace GH63759 {233struct C {234 int y = 1;235 union {236 int a;237 short b;238 };239 int x = 1;240};241 242void foo() {243 C c1 = {.x = 3, .a = 1}; // reorder-error-re {{ISO C++ requires field designators to be specified in declaration order; field 'x' will be initialized after field 'GH63759::C::(anonymous union at {{.*}})'}}244 // reorder-note@-1 {{previous initialization for field 'x' is here}}245 246 C c2 = {.a = 3, .y = 1}; // reorder-error-re {{ISO C++ requires field designators to be specified in declaration order; field 'GH63759::C::(anonymous union at {{.*}})' will be initialized after field 'y'}}247 // reorder-note-re@-1 {{previous initialization for field 'GH63759::C::(anonymous union at {{.*}})' is here}}248 //249}250}251