1// RUN: %clang_cc1 -fsyntax-only -verify -Wvla %s 2struct NonPOD { 3 NonPOD(); 4}; 5 6struct NonPOD2 { 7 NonPOD np; 8}; 9 10struct POD { 11 int x; 12 int y; 13}; 14 15// We allow VLAs of POD types, only. 16void vla(int N) { 17 int array1[N]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 18 POD array2[N]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 19 NonPOD array3[N]; // expected-error{{variable length array of non-POD element type 'NonPOD'}} 20 NonPOD2 array4[N][3]; // expected-error{{variable length array of non-POD element type 'NonPOD2'}} 21} 22 23/// Warn about VLAs in templates. 24template<typename T> 25void vla_in_template(int N, T t) { 26 int array1[N]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 27} 28 29struct HasConstantValue { 30 static const unsigned int value = 2; 31}; 32 33struct HasNonConstantValue { 34 static unsigned int value; 35}; 36 37template<typename T> 38void vla_in_template(T t) { 39 int array2[T::value]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 40} 41 42template void vla_in_template<HasConstantValue>(HasConstantValue); 43template void vla_in_template<HasNonConstantValue>(HasNonConstantValue); // expected-note{{instantiation of}} 44 45template<typename T> struct X0 { }; 46 47// Cannot use any variably-modified type with a template parameter or 48// argument. 49void inst_with_vla(int N) { 50 int array[N]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 51 X0<__typeof__(array)> x0a; // expected-error{{variably modified type 'typeof (array)' (aka 'int [N]') cannot be used as a template argument}} 52} 53 54template<typename T> 55struct X1 { 56 template<int (&Array)[T::value]> // expected-error{{non-type template parameter of variably modified type 'int (&)[HasNonConstantValue::value]'}} \ 57 // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 58 struct Inner { 59 60 }; 61}; 62 63X1<HasConstantValue> x1a; 64X1<HasNonConstantValue> x1b; // expected-note{{in instantiation of}} 65 66// Template argument deduction does not allow deducing a size from a VLA. 67template<typename T, unsigned N> 68void accept_array(T (&array)[N]); // expected-note{{candidate template ignored: failed template argument deduction}} 69 70void test_accept_array(int N) { 71 int array[N]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 72 accept_array(array); // expected-error{{no matching function for call to 'accept_array'}} 73} 74 75// Variably-modified types cannot be used in local classes. 76void local_classes(int N) { 77 struct X { 78 int size; 79 int array[N]; // expected-error{{fields must have a constant size: 'variable length array in structure' extension will never be supported}} \ 80 // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 81 }; 82} 83 84namespace PR7206 { 85 void f(int x) { 86 struct edge_info { 87 float left; 88 float right; 89 }; 90 struct edge_info edgeInfo[x]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 91 } 92} 93 94namespace rdar8020206 { 95 template<typename T> 96 void f(int i) { 97 const unsigned value = i; 98 int array[value * i]; // expected-warning 2{{variable length arrays are a C99 feature, accepted as an extension}} 99 } 100 101 template void f<int>(int); // expected-note{{instantiation of}} 102} 103 104namespace rdar8021385 { 105 typedef int my_int; 106 struct A { typedef int my_int; }; 107 template<typename T> 108 struct B { 109 typedef typename T::my_int my_int; 110 void f0() { 111 int M = 4; 112 my_int a[M]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 113 } 114 }; 115 B<A> a; 116} 117 118namespace PR8209 { 119 void f(int n) { 120 typedef int vla_type[n]; // expected-warning{{variable length arrays are a C99 feature, accepted as an extension}} 121 (void)new vla_type; // expected-error{{variably}} 122 } 123} 124 125namespace rdar8733881 { // rdar://8733881 126 127static const int k_cVal3 = (int)(1000*0.2f); 128 int f() { 129 // Ok, fold to a constant size array as an extension. 130 char rgch[k_cVal3] = {0}; 131 } 132} 133