cfg-nested-var-scopes.cpp source code [clang_source_code/INPUTS/cfg-nested-var-scopes.cpp]

1	// Hammer the CFG with large numbers of overlapping variable scopes, which
2	// implicit destructors triggered at each edge.
3
4	#define EXPAND_BASIC_STRUCT(i) struct X##i { X##i(int); ~X##i(); };
5	#define EXPAND_NORET_STRUCT(i) struct X##i { X##i(int); ~X##i() __attribute__((noreturn)); };
6	EXPAND_BASIC_STRUCT(0000); EXPAND_NORET_STRUCT(0001);
7	EXPAND_BASIC_STRUCT(0010); EXPAND_BASIC_STRUCT(0011);
8	EXPAND_BASIC_STRUCT(0100); EXPAND_NORET_STRUCT(0101);
9	EXPAND_NORET_STRUCT(0110); EXPAND_BASIC_STRUCT(0111);
10	EXPAND_BASIC_STRUCT(1000); EXPAND_NORET_STRUCT(1001);
11	EXPAND_BASIC_STRUCT(1010); EXPAND_BASIC_STRUCT(1011);
12	EXPAND_NORET_STRUCT(1100); EXPAND_NORET_STRUCT(1101);
13	EXPAND_BASIC_STRUCT(1110); EXPAND_BASIC_STRUCT(1111);
14
15	#define EXPAND_2_VARS(c, i, x) const X##i var_##c##_##i##0(x), &var_##c##_##i##1 = X##i(x)
16	#define EXPAND_4_VARS(c, i, x) EXPAND_2_VARS(c, i##0, x); EXPAND_2_VARS(c, i##1, x)
17	#define EXPAND_8_VARS(c, i, x) EXPAND_4_VARS(c, i##0, x); EXPAND_4_VARS(c, i##1, x)
18	#define EXPAND_16_VARS(c, i, x) EXPAND_8_VARS(c, i##0, x); EXPAND_8_VARS(c, i##1, x)
19	#define EXPAND_32_VARS(c, x) EXPAND_16_VARS(c, 0, x); EXPAND_16_VARS(c, 1, x)
20
21	#define EXPAND_2_INNER_CASES(i, x, y) INNER_CASE(i, x, y); INNER_CASE(i + 1, x, y);
22	#define EXPAND_4_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i, x, y) EXPAND_2_INNER_CASES(i + 2, x, y)
23	#define EXPAND_8_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i, x, y) EXPAND_4_INNER_CASES(i + 4, x, y)
24	#define EXPAND_16_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i, x, y) EXPAND_8_INNER_CASES(i + 8, x, y)
25	#define EXPAND_32_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i, x, y) EXPAND_16_INNER_CASES(i + 16, x, y)
26
27	#define EXPAND_2_OUTER_CASES(i, x, y) OUTER_CASE(i, x, y); OUTER_CASE(i + 1, x, y);
28	#define EXPAND_4_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i, x, y) EXPAND_2_OUTER_CASES(i + 2, x, y)
29	#define EXPAND_8_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i, x, y) EXPAND_4_OUTER_CASES(i + 4, x, y)
30	#define EXPAND_16_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i, x, y) EXPAND_8_OUTER_CASES(i + 8, x, y)
31	#define EXPAND_32_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i, x, y) EXPAND_16_OUTER_CASES(i + 16, x, y)
32
33	unsigned cfg_nested_vars(int x) {
34	int y = 0;
35	while (x > 0) {
36	EXPAND_32_VARS(a, x);
37	switch (x) {
38	#define INNER_CASE(i, x, y) \
39	case i: { \
40	int case_var = 3*x + i; \
41	EXPAND_32_VARS(c, case_var); \
42	y += case_var - 1; \
43	break; \
44	}
45	#define OUTER_CASE(i, x, y) \
46	case i: { \
47	int case_var = y >> 8; \
48	EXPAND_32_VARS(b, y); \
49	switch (case_var) { \
50	EXPAND_32_INNER_CASES(0, x, y); \
51	} \
52	break; \
53	}
54	EXPAND_32_OUTER_CASES(0, x, y);
55	}
56	--x;
57	}
58	return y;
59	}
60

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