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