1 // RUN: %clang_analyze_cc1 -analyzer-checker=core -analyzer-output text \ 2 // RUN: -verify %s 3 4 void test_no_overflow_note(int a, int b) 5 { 6 int res; 7 8 if (__builtin_add_overflow(a, b, &res)) // expected-note {{Assuming no overflow}} 9 // expected-note@-1 {{Taking false branch}} 10 return; 11 12 if (res) { // expected-note {{Assuming 'res' is not equal to 0}} 13 // expected-note@-1 {{Taking true branch}} 14 int *ptr = 0; // expected-note {{'ptr' initialized to a null pointer value}} 15 int var = *(int *) ptr; //expected-warning {{Dereference of null pointer}} 16 //expected-note@-1 {{Dereference of null pointer}} 17 } 18 } 19 20 void test_overflow_note(int a, int b) 21 { 22 int res; // expected-note{{'res' declared without an initial value}} 23 24 if (__builtin_add_overflow(a, b, &res)) { // expected-note {{Assuming overflow}} 25 // expected-note@-1 {{Taking true branch}} 26 int var = res; // expected-warning{{Assigned value is garbage or undefined}} 27 // expected-note@-1 {{Assigned value is garbage or undefined}} 28 return; 29 } 30 } 31