1 // RUN: %clang_cc1 -verify %s
2
foo()3 int foo() {
4 int x[2]; // expected-note 4 {{array 'x' declared here}}
5 int y[2]; // expected-note 2 {{array 'y' declared here}}
6 int z[1]; // expected-note {{array 'z' declared here}}
7 int w[1][1]; // expected-note {{array 'w' declared here}}
8 int v[1][1][1]; // expected-note {{array 'v' declared here}}
9 int *p = &y[2]; // no-warning
10 (void) sizeof(x[2]); // no-warning
11 y[2] = 2; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
12 z[1] = 'x'; // expected-warning {{array index 1 is past the end of the array (which contains 1 element)}}
13 w[0][2] = 0; // expected-warning {{array index 2 is past the end of the array (which contains 1 element)}}
14 v[0][0][2] = 0; // expected-warning {{array index 2 is past the end of the array (which contains 1 element)}}
15 return x[2] + // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
16 y[-1] + // expected-warning {{array index -1 is before the beginning of the array}}
17 x[sizeof(x)] + // expected-warning {{array index 8 is past the end of the array (which contains 2 elements)}}
18 x[sizeof(x) / sizeof(x[0])] + // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
19 x[sizeof(x) / sizeof(x[0]) - 1] + // no-warning
20 x[sizeof(x[2])]; // expected-warning {{array index 4 is past the end of the array (which contains 2 elements)}}
21 }
22
23 // This code example tests that -Warray-bounds works with arrays that
24 // are template parameters.
25 template <char *sz> class Qux {
test()26 bool test() { return sz[0] == 'a'; }
27 };
28
f1(int a[1])29 void f1(int a[1]) {
30 int val = a[3]; // no warning for function argumnet
31 }
32
f2(const int (& a)[2])33 void f2(const int (&a)[2]) { // expected-note {{declared here}}
34 int val = a[3]; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
35 }
36
test()37 void test() {
38 struct {
39 int a[0];
40 } s2;
41 s2.a[3] = 0; // no warning for 0-sized array
42
43 union {
44 short a[2]; // expected-note 4 {{declared here}}
45 char c[4];
46 } u;
47 u.a[3] = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
48 u.c[3] = 1; // no warning
49 short *p = &u.a[2]; // no warning
50 p = &u.a[3]; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
51 *(&u.a[2]) = 1; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
52 *(&u.a[3]) = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
53 *(&u.c[3]) = 1; // no warning
54
55 const int const_subscript = 3;
56 int array[2]; // expected-note {{declared here}}
57 array[const_subscript] = 0; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
58
59 int *ptr;
60 ptr[3] = 0; // no warning for pointer references
61 int array2[] = { 0, 1, 2 }; // expected-note 2 {{declared here}}
62
63 array2[3] = 0; // expected-warning {{array index 3 is past the end of the array (which contains 3 elements)}}
64 array2[2+2] = 0; // expected-warning {{array index 4 is past the end of the array (which contains 3 elements)}}
65
66 const char *str1 = "foo";
67 char c1 = str1[5]; // no warning for pointers
68
69 const char str2[] = "foo"; // expected-note {{declared here}}
70 char c2 = str2[5]; // expected-warning {{array index 5 is past the end of the array (which contains 4 elements)}}
71
72 int (*array_ptr)[2];
73 (*array_ptr)[3] = 1; // expected-warning {{array index 3 is past the end of the array (which contains 2 elements)}}
74 }
75
76 template <int I> struct S {
77 char arr[I]; // expected-note 3 {{declared here}}
78 };
f()79 template <int I> void f() {
80 S<3> s;
81 s.arr[4] = 0; // expected-warning 2 {{array index 4 is past the end of the array (which contains 3 elements)}}
82 s.arr[I] = 0; // expected-warning {{array index 5 is past the end of the array (which contains 3 elements)}}
83 }
84
test_templates()85 void test_templates() {
86 f<5>(); // expected-note {{in instantiation}}
87 }
88
89 #define SIZE 10
90 #define ARR_IN_MACRO(flag, arr, idx) flag ? arr[idx] : 1
91
test_no_warn_macro_unreachable()92 int test_no_warn_macro_unreachable() {
93 int arr[SIZE]; // expected-note {{array 'arr' declared here}}
94 return ARR_IN_MACRO(0, arr, SIZE) + // no-warning
95 ARR_IN_MACRO(1, arr, SIZE); // expected-warning{{array index 10 is past the end of the array (which contains 10 elements)}}
96 }
97
98 // This exhibited an assertion failure for a 32-bit build of Clang.
test_pr9240()99 int test_pr9240() {
100 short array[100]; // expected-note {{array 'array' declared here}}
101 return array[(unsigned long long) 100]; // expected-warning {{array index 100 is past the end of the array (which contains 100 elements)}}
102 }
103
104 // PR 9284 - a template parameter can cause an array bounds access to be
105 // infeasible.
106 template <bool extendArray>
pr9284()107 void pr9284() {
108 int arr[3 + (extendArray ? 1 : 0)];
109
110 if (extendArray)
111 arr[3] = 42; // no-warning
112 }
113
114 template <bool extendArray>
pr9284b()115 void pr9284b() {
116 int arr[3 + (extendArray ? 1 : 0)]; // expected-note {{array 'arr' declared here}}
117
118 if (!extendArray)
119 arr[3] = 42; // expected-warning{{array index 3 is past the end of the array (which contains 3 elements)}}
120 }
121
test_pr9284()122 void test_pr9284() {
123 pr9284<true>();
124 pr9284<false>();
125 pr9284b<true>();
126 pr9284b<false>(); // expected-note{{in instantiation of function template specialization 'pr9284b<false>' requested here}}
127 }
128
test_pr9296()129 int test_pr9296() {
130 int array[2];
131 return array[true]; // no-warning
132 }
133
test_sizeof_as_condition(int flag)134 int test_sizeof_as_condition(int flag) {
135 int arr[2] = { 0, 0 }; // expected-note {{array 'arr' declared here}}
136 if (flag)
137 return sizeof(char) != sizeof(char) ? arr[2] : arr[1];
138 return sizeof(char) == sizeof(char) ? arr[2] : arr[1]; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
139 }
140
test_switch()141 void test_switch() {
142 switch (4) {
143 case 1: {
144 int arr[2];
145 arr[2] = 1; // no-warning
146 break;
147 }
148 case 4: {
149 int arr[2]; // expected-note {{array 'arr' declared here}}
150 arr[2] = 1; // expected-warning {{array index 2 is past the end of the array (which contains 2 elements)}}
151 break;
152 }
153 default: {
154 int arr[2];
155 arr[2] = 1; // no-warning
156 break;
157 }
158 }
159 }
160
161 // Test nested switch statements.
162 enum enumA { enumA_A, enumA_B, enumA_C, enumA_D, enumA_E };
163 enum enumB { enumB_X, enumB_Y, enumB_Z };
164 static enum enumB myVal = enumB_X;
test_nested_switch()165 void test_nested_switch() {
166 switch (enumA_E) { // expected-warning {{no case matching constant}}
167 switch (myVal) { // expected-warning {{enumeration values 'enumB_X' and 'enumB_Z' not handled in switch}}
168 case enumB_Y: ;
169 }
170 }
171 }
172
173 // Test that if all the values of an enum covered, that the 'default' branch
174 // is unreachable.
175 enum Values { A, B, C, D };
test_all_enums_covered(enum Values v)176 void test_all_enums_covered(enum Values v) {
177 int x[2];
178 switch (v) {
179 case A: return;
180 case B: return;
181 case C: return;
182 case D: return;
183 }
184 x[2] = 0; // no-warning
185 }
186
187 namespace tailpad {
188 struct foo {
189 char c1[1]; // expected-note {{declared here}}
190 int x;
191 char c2[1];
192 };
193
194 class baz {
195 public:
196 char c1[1]; // expected-note {{declared here}}
197 int x;
198 char c2[1];
199 };
200
bar(struct foo * F,baz * B)201 char bar(struct foo *F, baz *B) {
202 return F->c1[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}}
203 F->c2[3] + // no warning, foo could have tail padding allocated.
204 B->c1[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}}
205 B->c2[3]; // no warning, baz could have tail padding allocated.
206 }
207 }
208
209 namespace metaprogramming {
210 #define ONE 1
211 struct foo { char c[ONE]; }; // expected-note {{declared here}}
212 template <int N> struct bar { char c[N]; }; // expected-note {{declared here}}
213
test(foo * F,bar<1> * B)214 char test(foo *F, bar<1> *B) {
215 return F->c[3] + // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}}
216 B->c[3]; // expected-warning {{array index 3 is past the end of the array (which contains 1 element)}}
217 }
218 }
219
bar(int x)220 void bar(int x) {}
test_more()221 int test_more() {
222 int foo[5]; // expected-note 5 {{array 'foo' declared here}}
223 bar(foo[5]); // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}}
224 ++foo[5]; // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}}
225 if (foo[6]) // expected-warning {{array index 6 is past the end of the array (which contains 5 elements)}}
226 return --foo[6]; // expected-warning {{array index 6 is past the end of the array (which contains 5 elements)}}
227 else
228 return foo[5]; // expected-warning {{array index 5 is past the end of the array (which contains 5 elements)}}
229 }
230
test_pr10771()231 void test_pr10771() {
232 double foo[4096]; // expected-note {{array 'foo' declared here}}
233
234 ((char*)foo)[sizeof(foo) - 1] = '\0'; // no-warning
235 *(((char*)foo) + sizeof(foo) - 1) = '\0'; // no-warning
236
237 ((char*)foo)[sizeof(foo)] = '\0'; // expected-warning {{array index 32768 is past the end of the array (which contains 32768 elements)}}
238
239 // TODO: This should probably warn, too.
240 *(((char*)foo) + sizeof(foo)) = '\0'; // no-warning
241 }
242
243 int test_pr11007_aux(const char * restrict, ...);
244
245 // Test checking with varargs.
test_pr11007()246 void test_pr11007() {
247 double a[5]; // expected-note {{array 'a' declared here}}
248 test_pr11007_aux("foo", a[1000]); // expected-warning {{array index 1000 is past the end of the array}}
249 }
250
test_rdar10916006(void)251 void test_rdar10916006(void)
252 {
253 int a[128]; // expected-note {{array 'a' declared here}}
254 a[(unsigned char)'\xA1'] = 1; // expected-warning {{array index 161 is past the end of the array}}
255 }
256