| Masatake YAMATO | 9682107 | 2014-05-14 13:16:29 +0900 | [diff] [blame] | 1 | #include <unistd.h> |
| 2 | #include <sys/types.h> |
| 3 | |
| 4 | /* Use "volatile" to avoid compiler optimization. */ |
| 5 | |
| Dmitry V. Levin | c588b20 | 2014-06-13 15:07:24 +0000 | [diff] [blame^] | 6 | int f3(int i) |
| Masatake YAMATO | 9682107 | 2014-05-14 13:16:29 +0900 | [diff] [blame] | 7 | { |
| Dmitry V. Levin | e411397 | 2014-06-05 14:37:04 +0000 | [diff] [blame] | 8 | static pid_t (* volatile g)(void) = getpid; |
| Masatake YAMATO | 9682107 | 2014-05-14 13:16:29 +0900 | [diff] [blame] | 9 | return g() + i; |
| 10 | } |
| 11 | |
| Dmitry V. Levin | c588b20 | 2014-06-13 15:07:24 +0000 | [diff] [blame^] | 12 | int f2(volatile int i) |
| 13 | { |
| 14 | static int (* volatile g)(int) = f3; |
| 15 | return g(i) - i; |
| 16 | } |
| 17 | |
| 18 | int f1(volatile int i) |
| 19 | { |
| 20 | static int (* volatile g)(int) = f2; |
| 21 | return g(i) + i; |
| 22 | } |
| 23 | |
| Masatake YAMATO | 9682107 | 2014-05-14 13:16:29 +0900 | [diff] [blame] | 24 | int f0(volatile int i) |
| 25 | { |
| 26 | static int (* volatile g)(int) = f1; |
| 27 | return g(i) - i; |
| 28 | } |
| 29 | |
| 30 | int main(int argc, char** argv) |
| 31 | { |
| 32 | static int (* volatile g)(int) = f0; |
| 33 | g(argc); |
| 34 | return 0; |
| 35 | } |