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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/numeric.c
+7 -7
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@@ -2303,6 +2303,9 @@ static const mrb_mt_entry numeric_rom_entries[] = {
MRB_MT_ENTRY(num_finite_p, MRB_SYM_Q(finite), MRB_MT_NOARG),
MRB_MT_ENTRY(num_infinite_p, MRB_SYM_Q(infinite), MRB_MT_NOARG),
MRB_MT_ENTRY(num_eql, MRB_SYM_Q(eql), 0),
#ifndef MRB_NO_FLOAT
MRB_MT_ENTRY(num_fdiv, MRB_SYM(fdiv), 0),
#endif
};
static mrb_mt_tbl numeric_rom_mt = MRB_MT_ROM_TAB(numeric_rom_entries);
@@ -2338,6 +2341,10 @@ static const mrb_mt_entry integer_rom_entries[] = {
MRB_MT_ENTRY(int_to_s, MRB_SYM(inspect), 0),
MRB_MT_ENTRY(int_divmod, MRB_SYM(divmod), 0),
MRB_MT_ENTRY(coerce_step_counter, MRB_SYM(__coerce_step_counter), 0),
#ifndef MRB_NO_FLOAT
MRB_MT_ENTRY(int_fdiv, MRB_SYM(fdiv), 0),
MRB_MT_ENTRY(int_to_f, MRB_SYM(to_f), MRB_MT_NOARG),
#endif
};
static mrb_mt_tbl integer_rom_mt = MRB_MT_ROM_TAB(integer_rom_entries);
@@ -2387,9 +2394,6 @@ mrb_init_numeric(mrb_state *mrb)
/* Numeric Class */
numeric = mrb_define_class_id(mrb, MRB_SYM(Numeric), mrb->object_class); /* 15.2.7 */
mrb_mt_init_rom(numeric, &numeric_rom_mt);
#ifndef MRB_NO_FLOAT
mrb_define_method_id(mrb, numeric, MRB_SYM(fdiv), num_fdiv, MRB_ARGS_REQ(1));
#endif
/* Integer Class */
mrb->integer_class = integer = mrb_define_class_id(mrb, MRB_SYM(Integer), numeric); /* 15.2.8 */
@@ -2397,10 +2401,6 @@ mrb_init_numeric(mrb_state *mrb)
MRB_UNDEF_ALLOCATOR(integer);
mrb_undef_class_method_id(mrb, integer, MRB_SYM(new));
mrb_mt_init_rom(integer, &integer_rom_mt);
#ifndef MRB_NO_FLOAT
mrb_define_method_id(mrb, integer, MRB_SYM(fdiv), int_fdiv, MRB_ARGS_REQ(1));
mrb_define_method_id(mrb, integer, MRB_SYM(to_f), int_to_f, MRB_ARGS_NONE()); /* 15.2.8.3.23 */
#endif
/* Fixnum Class for compatibility */
mrb_define_const_id(mrb, mrb->object_class, MRB_SYM(Fixnum), mrb_obj_value(integer));