| // Hammer the CFG with large numbers of overlapping variable scopes, which |
| // implicit destructors triggered at each edge. |
| |
| #define EXPAND_BASIC_STRUCT(i) struct X##i { X##i(int); ~X##i(); }; |
| #define EXPAND_NORET_STRUCT(i) struct X##i { X##i(int); ~X##i() __attribute__((noreturn)); }; |
| EXPAND_BASIC_STRUCT(0000); EXPAND_NORET_STRUCT(0001); |
| EXPAND_BASIC_STRUCT(0010); EXPAND_BASIC_STRUCT(0011); |
| EXPAND_BASIC_STRUCT(0100); EXPAND_NORET_STRUCT(0101); |
| EXPAND_NORET_STRUCT(0110); EXPAND_BASIC_STRUCT(0111); |
| EXPAND_BASIC_STRUCT(1000); EXPAND_NORET_STRUCT(1001); |
| EXPAND_BASIC_STRUCT(1010); EXPAND_BASIC_STRUCT(1011); |
| EXPAND_NORET_STRUCT(1100); EXPAND_NORET_STRUCT(1101); |
| EXPAND_BASIC_STRUCT(1110); EXPAND_BASIC_STRUCT(1111); |
| |
| #define EXPAND_2_VARS(c, i, x) const X##i var_##c##_##i##0(x), &var_##c##_##i##1 = X##i(x) |
| #define EXPAND_4_VARS(c, i, x) EXPAND_2_VARS(c, i##0, x); EXPAND_2_VARS(c, i##1, x) |
| #define EXPAND_8_VARS(c, i, x) EXPAND_4_VARS(c, i##0, x); EXPAND_4_VARS(c, i##1, x) |
| #define EXPAND_16_VARS(c, i, x) EXPAND_8_VARS(c, i##0, x); EXPAND_8_VARS(c, i##1, x) |
| #define EXPAND_32_VARS(c, x) EXPAND_16_VARS(c, 0, x); EXPAND_16_VARS(c, 1, x) |
| |
| #define EXPAND_2_INNER_CASES(i, x, y) INNER_CASE(i, x, y); INNER_CASE(i + 1, x, y); |
| #define EXPAND_4_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i + 2, x, y) |
| #define EXPAND_8_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i + 4, x, y) |
| #define EXPAND_16_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i + 8, x, y) |
| #define EXPAND_32_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i + 16, x, y) |
| |
| #define EXPAND_2_OUTER_CASES(i, x, y) OUTER_CASE(i, x, y); OUTER_CASE(i + 1, x, y); |
| #define EXPAND_4_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i + 2, x, y) |
| #define EXPAND_8_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i + 4, x, y) |
| #define EXPAND_16_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i + 8, x, y) |
| #define EXPAND_32_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i + 16, x, y) |
| |
| unsigned cfg_nested_vars(int x) { |
| int y = 0; |
| while (x > 0) { |
| EXPAND_32_VARS(a, x); |
| switch (x) { |
| #define INNER_CASE(i, x, y) \ |
| case i: { \ |
| int case_var = 3*x + i; \ |
| EXPAND_32_VARS(c, case_var); \ |
| y += case_var - 1; \ |
| break; \ |
| } |
| #define OUTER_CASE(i, x, y) \ |
| case i: { \ |
| int case_var = y >> 8; \ |
| EXPAND_32_VARS(b, y); \ |
| switch (case_var) { \ |
| EXPAND_32_INNER_CASES(0, x, y); \ |
| } \ |
| break; \ |
| } |
| EXPAND_32_OUTER_CASES(0, x, y); |
| } |
| --x; |
| } |
| return y; |
| } |