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