| extern void* malloc (__SIZE_TYPE__); |
| |
| const char* write_strchr_literal (int x) |
| { |
| char *p = __builtin_strchr ("123", x); |
| *p = 0; /* { dg-warning "dereference of NULL 'p'" "null deref" } */ |
| /* { dg-warning "write to string literal" "string literal" { target *-*-* } .-1 } */ |
| return p; |
| } |
| |
| const char* write_strchr_const_array (int x) |
| { |
| static const char a[] = "123"; |
| char *p = __builtin_strchr (a, x); |
| *p = 0; /* { dg-warning "dereference of NULL 'p'" "null deref" } */ |
| /* { dg-warning "write to 'const' object 'a'" "write to const" { target *-*-* } .-1 } */ |
| return a; |
| } |
| |
| char* write_function (void) |
| { |
| char *p = (char*)malloc /* forgot arguments */; |
| p[1] = 'a'; /* { dg-warning "write to function 'malloc'" } */ |
| __builtin_strcpy (p, "123"); /* { dg-warning "write to function 'malloc'" } */ |
| return p; |
| } |
| |
| char* write_label (void) |
| { |
| char *p = (char*)&&L; |
| *p = 0; /* { dg-warning "write to label 'L'" } */ |
| L: |
| return p; |
| } |
| |
| struct A { const int i; }; |
| |
| extern /* not const */ struct A a; |
| |
| void write_const_member (void) |
| { |
| char *p = (char*)&a.i; |
| *p = 0; // missing warning |
| } |