1 // RUN: %clang_cc1 -verify -Wno-string-plus-int -Warray-bounds-pointer-arithmetic %s
2
swallow(const char * x)3 void swallow (const char *x) { (void)x; }
test_pointer_arithmetic(int n)4 void test_pointer_arithmetic(int n) {
5 const char hello[] = "Hello world!"; // expected-note 2 {{declared here}}
6 const char *helloptr = hello;
7
8 swallow("Hello world!" + 6); // no-warning
9 swallow("Hello world!" - 6); // expected-warning {{the pointer decremented by 6 refers before the beginning of the array}}
10 swallow("Hello world!" + 14); // expected-warning {{the pointer incremented by 14 refers past the end of the array (that has type 'const char[13]')}}
11 swallow("Hello world!" + 13); // no-warning
12
13 swallow(hello + 6); // no-warning
14 swallow(hello - 6); // expected-warning {{the pointer decremented by 6 refers before the beginning of the array}}
15 swallow(hello + 14); // expected-warning {{the pointer incremented by 14 refers past the end of the array (that has type 'const char[13]')}}
16 swallow(hello + 13); // no-warning
17
18 swallow(helloptr + 6); // no-warning
19 swallow(helloptr - 6); // no-warning
20 swallow(helloptr + 14); // no-warning
21 swallow(helloptr + 13); // no-warning
22
23 double numbers[2]; // expected-note {{declared here}}
24 swallow((char*)numbers + sizeof(double)); // no-warning
25 swallow((char*)numbers + 60); // expected-warning {{the pointer incremented by 60 refers past the end of the array (that has type 'double[2]')}}
26
27 char buffer[5]; // expected-note 2 {{declared here}}
28 // TODO: Add FixIt notes for adding parens around non-ptr part of arith expr
29 swallow(buffer + sizeof("Hello")-1); // expected-warning {{the pointer incremented by 6 refers past the end of the array (that has type 'char[5]')}}
30 swallow(buffer + (sizeof("Hello")-1)); // no-warning
31 if (n > 0 && n <= 6) swallow(buffer + 6 - n); // expected-warning {{the pointer incremented by 6 refers past the end of the array (that has type 'char[5]')}}
32 if (n > 0 && n <= 6) swallow(buffer + (6 - n)); // no-warning
33 }
34