| #define MY_MACRO(a) do { \ |
| __builtin_warning(!__builtin_safe_p(a), "Macro argument with side effects: " #a); \ |
| a; \ |
| } while (0) |
| |
| int g(int); |
| int h(int) __attribute__((pure)); |
| int i(int) __attribute__((const)); |
| |
| static int foo(int x, int y) |
| { |
| /* unsafe: */ |
| MY_MACRO(x++); |
| MY_MACRO(x+=1); |
| MY_MACRO(x=x+1); |
| MY_MACRO(x%=y); |
| MY_MACRO(x=y); |
| MY_MACRO(g(x)); |
| MY_MACRO((y,g(x))); |
| /* safe: */ |
| MY_MACRO(x+1); |
| MY_MACRO(h(x)); |
| MY_MACRO(i(x)); |
| return x; |
| } |
| |
| /* |
| * check-name: __builtin_safe |
| * check-error-start |
| builtin_safe1.c:13:3: warning: Macro argument with side effects: x++ |
| builtin_safe1.c:14:3: warning: Macro argument with side effects: x+=1 |
| builtin_safe1.c:15:3: warning: Macro argument with side effects: x=x+1 |
| builtin_safe1.c:16:3: warning: Macro argument with side effects: x%=y |
| builtin_safe1.c:17:3: warning: Macro argument with side effects: x=y |
| builtin_safe1.c:18:3: warning: Macro argument with side effects: g(x) |
| builtin_safe1.c:19:3: warning: Macro argument with side effects: (y,g(x)) |
| * check-error-end |
| */ |
