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| // 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;
| }
|
|
