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Split presym_table for reduced program size

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Because a structure that is an element of `presym_table` has padding, split
it into individual arrays for name and length.

#### Result (64-bit CPU with full-core gembox)

|        |   mruby    | libmruby.a |
|--------|------------|------------|
| Before | 1,087,444B | 1,476,872B |
| After  | 1,079,340B | 1,469,784B |
This commit is contained in:
KOBAYASHI Shuji
2021-01-27 20:47:10 +09:00
parent 251fd74315
commit 3104aed8c6
4 changed files with 45 additions and 38 deletions
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src/symbol.c
+8 -15
View File
@@ -15,31 +15,24 @@
#ifndef MRB_NO_PRESYM
# undef MRB_PRESYM_MAX
# define MRB_PRESYM_NAMED(lit, num, type, name) {lit, sizeof(lit)-1},
# define MRB_PRESYM_UNNAMED(lit, num) {lit, sizeof(lit)-1},
static const struct {
const char *name;
uint16_t len;
} presym_table[] = {
#ifndef MRB_PRESYM_SCANNING
# include <mruby/presym.inc>
/* const uint16_t presym_length_table[] */
/* const char * const presym_name_table[] */
# include <mruby/presym/table.h>
#endif
};
static mrb_sym
presym_find(const char *name, size_t len)
{
if (presym_table[MRB_PRESYM_MAX-1].len < len) return 0;
if (presym_length_table[MRB_PRESYM_MAX-1] < len) return 0;
mrb_sym start, idx, presym_size = MRB_PRESYM_MAX;
int cmp;
for (start = 0; presym_size != 0; presym_size/=2) {
idx = start+presym_size/2;
cmp = (int)len-(int)presym_table[idx].len;
cmp = (int)len-(int)presym_length_table[idx];
if (cmp == 0) {
cmp = memcmp(name, presym_table[idx].name, len);
cmp = memcmp(name, presym_name_table[idx], len);
if (cmp == 0) return idx+1;
}
if (0 < cmp) {
@@ -54,8 +47,8 @@ static const char*
presym_sym2name(mrb_sym sym, mrb_int *lenp)
{
if (sym > MRB_PRESYM_MAX) return NULL;
if (lenp) *lenp = presym_table[sym-1].len;
return presym_table[sym-1].name;
if (lenp) *lenp = presym_length_table[sym-1];
return presym_name_table[sym-1];
}
#endif /* MRB_NO_PRESYM */