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class.c: merge conditional methods into ROM tables

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Move conditional mrb_define_method_id() calls into ROM entry
arrays using #ifdef guards. With linear search, sizeof in
MRB_MT_ROM_TAB() adjusts automatically after preprocessing.

Cross-class ROM tables (methods a gem defines on a class it does
not own) are reverted to mrb_define_method_id(). Multiple gems
should not add ROM table layers to the same class; each layer
costs a 16-byte mrb_mt_tbl struct in RAM and deepens the lookup
chain. Use mrb_define_method_id() for cross-class methods.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-02-20 11:05:03 +09:00
parent 8adba34bd9
commit 20b9002214
15 changed files with 74 additions and 135 deletions
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src/string.c
+3 -4
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@@ -3555,6 +3555,9 @@ static const mrb_mt_entry string_rom_entries[] = {
MRB_MT_ENTRY(mrb_str_byteslice, MRB_SYM(byteslice), 0),
MRB_MT_ENTRY(mrb_str_bytesplice, MRB_SYM(bytesplice), 0),
MRB_MT_ENTRY(sub_replace, MRB_SYM(__sub_replace), 0),
#ifndef MRB_NO_FLOAT
MRB_MT_ENTRY(mrb_str_to_f, MRB_SYM(to_f), MRB_MT_NOARG),
#endif
};
static mrb_mt_tbl string_rom_mt = MRB_MT_ROM_TAB(string_rom_entries);
@@ -3571,9 +3574,5 @@ mrb_init_string(mrb_state *mrb)
mrb_mt_init_rom(s, &string_rom_mt);
/* conditional methods not in ROM table */
#ifndef MRB_NO_FLOAT
mrb_define_method_id(mrb, s, MRB_SYM(to_f), mrb_str_to_f, MRB_ARGS_NONE()); /* 15.2.10.5.38 */
#endif
mrb_define_method_id(mrb, mrb->kernel_module, MRB_SYM(__ENCODING__), mrb_encoding, MRB_ARGS_NONE());
}