1 // RUN: %clang_cc1 -verify -Wno-string-plus-int -Warray-bounds-pointer-arithmetic %s 2 3 void swallow (const char *x) { (void)x; } 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 {{refers before the beginning of the array}} 10 swallow("Hello world!" + 14); // expected-warning {{refers past the end of the array}} 11 swallow("Hello world!" + 13); // no-warning 12 13 swallow(hello + 6); // no-warning 14 swallow(hello - 6); // expected-warning {{refers before the beginning of the array}} 15 swallow(hello + 14); // expected-warning {{refers past the end of the array}} 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 {{refers past the end of the array}} 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 {{refers past the end of the array}} 30 swallow(buffer + (sizeof("Hello")-1)); // no-warning 31 if (n > 0 && n <= 6) swallow(buffer + 6 - n); // expected-warning {{refers past the end of the array}} 32 if (n > 0 && n <= 6) swallow(buffer + (6 - n)); // no-warning 33 } 34
