mirror of
https://github.com/capstone-engine/llvm-capstone.git
synced 2024-12-11 17:08:42 +00:00
d280754094
preprocessor to build up very large CFGs in various shapes that can produce different algorithmic behavior in CFG-walking code. llvm-svn: 134698
37 lines
1.8 KiB
C
37 lines
1.8 KiB
C
#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_64_INNER_CASES(i, x, y) EXPAND_32_INNER_CASES(i, x, y) EXPAND_32_INNER_CASES(i + 32, 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)
|
|
#define EXPAND_64_OUTER_CASES(i, x, y) EXPAND_32_OUTER_CASES(i, x, y) EXPAND_32_OUTER_CASES(i + 32, x, y)
|
|
|
|
// Rather than a single monstrous fan-out, this fans out in smaller increments,
|
|
// but to a similar size.
|
|
unsigned cfg_nested_switch(int x) {
|
|
unsigned y = 0;
|
|
while (x > 0) {
|
|
switch (x) {
|
|
#define INNER_CASE(i, x, y) \
|
|
case i: { int case_var = 3*x + i; y += case_var - 1; break; }
|
|
#define OUTER_CASE(i, x, y) \
|
|
case i: { \
|
|
int case_var = y >> 8; \
|
|
switch (case_var) { \
|
|
EXPAND_64_INNER_CASES(0, x, y); \
|
|
} \
|
|
break; \
|
|
}
|
|
EXPAND_64_OUTER_CASES(0, x, y);
|
|
}
|
|
--x;
|
|
}
|
|
return y;
|
|
}
|