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errno.c: use C array instead of a hash table to lookup a errno class.

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To reduce memory consumption by avoiding allocating Ruby objects.
This commit is contained in:
Yukihiro "Matz" Matsumoto
2022-01-25 11:15:34 +09:00
parent 194d0c6f46
commit 9892742d27
1 changed files with 22 additions and 12 deletions
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mrbgems/mruby-errno/src/errno.c
+22 -12
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@@ -10,10 +10,18 @@
#include <string.h>
#include <mruby/presym.h>
static struct {
mrb_sym sym;
int eno;
} e2c[] = {
#include "known_errors_e2c.cstub"
{0, 0},
};
static mrb_value
mrb_sce_init(mrb_state *mrb, mrb_value self)
{
mrb_value c, e2c, m, str;
mrb_value m, str;
mrb_int n;
int argc, no_errno = 0;
char buf[20];
@@ -28,18 +36,23 @@ mrb_sce_init(mrb_state *mrb, mrb_value self)
}
}
if (!no_errno) {
e2c = mrb_const_get(mrb, mrb_obj_value(mrb_module_get_id(mrb, MRB_SYM(Errno))), MRB_SYM(Errno2class));
c = mrb_hash_fetch(mrb, e2c, mrb_fixnum_value(n), mrb_nil_value());
if (!mrb_nil_p(c)) {
mrb_basic_ptr(self)->c = mrb_class_ptr(c);
str = mrb_str_new_cstr(mrb, strerror(n));
} else {
int i;
for (i=0; e2c[i].sym != 0; i++) {
if (e2c[i].eno == n) {
mrb_basic_ptr(self)->c = mrb_class_get_under_id(mrb, mrb_module_get_id(mrb, MRB_SYM(Errno)), e2c[i].sym);
str = mrb_str_new_cstr(mrb, strerror(n));
break;
}
}
if (e2c[i].sym == 0) {
mrb_iv_set(mrb, self, MRB_SYM(errno), mrb_fixnum_value(n));
str = mrb_str_new_cstr(mrb, "Unknown error: ");
snprintf(buf, sizeof(buf), "%d", (int)n);
mrb_str_cat2(mrb, str, buf);
}
} else {
}
else {
str = mrb_str_new_cstr(mrb, "unknown error");
}
if (!mrb_nil_p(m)) {
@@ -121,7 +134,7 @@ void
mrb_mruby_errno_gem_init(mrb_state *mrb)
{
struct RClass *e, *eno, *sce, *ste;
mrb_value h, noerror;
mrb_value noerror;
ste = mrb_class_get_id(mrb, MRB_SYM(StandardError));
@@ -132,8 +145,6 @@ mrb_mruby_errno_gem_init(mrb_state *mrb)
mrb_define_method(mrb, sce, "initialize", mrb_sce_init, MRB_ARGS_ARG(1, 1));
eno = mrb_define_module_id(mrb, MRB_SYM(Errno));
h = mrb_hash_new(mrb);
mrb_define_const_id(mrb, eno, MRB_SYM(Errno2class), h);
e = mrb_define_class_under_id(mrb, eno, MRB_SYM(NOERROR), sce);
mrb_define_const_id(mrb, e, MRB_SYM(Errno), mrb_fixnum_value(0));
@@ -147,7 +158,6 @@ mrb_mruby_errno_gem_init(mrb_state *mrb)
e = mrb_define_class_under(mrb, eno, #SYM, sce); \
mrb_define_const_id(mrb, e, MRB_SYM(Errno), mrb_fixnum_value(SYM)); \
mrb_define_method(mrb, e, "initialize", mrb_exxx_init, MRB_ARGS_OPT(1)); \
mrb_hash_set(mrb, h, mrb_fixnum_value(SYM), mrb_obj_value(e)); \
mrb_gc_arena_restore(mrb, ai); \
} while (0)