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class.c: refactor ROM method tables to array-of-structs layout

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Replace the parallel-arrays (struct-of-arrays) ROM method table
layout with an array-of-structs layout where each mrb_mt_entry
bundles its function pointer and symbol key together.

New MRB_MT_ENTRY() and MRB_MT_ROM_TAB() macros simplify ROM table
definitions from a 3-part pattern (SIZE define + anonymous struct +
mrb_mt_tbl) to a 2-part pattern (entries array + mrb_mt_tbl).

Internal mt_* functions in class.c are simplified: single memmove/
memcpy operations replace paired key+value operations.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-02-19 23:59:30 +09:00
parent cfd9214b3d
commit bde2202100
34 changed files with 969 additions and 2337 deletions
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include/mruby/internal.h
+18 -2
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@@ -34,10 +34,16 @@ union mrb_mt_ptr {
mrb_func_t func;
};
/* entry combining function pointer and key */
typedef struct mrb_mt_entry {
union mrb_mt_ptr val;
mrb_sym key;
} mrb_mt_entry;
typedef struct mrb_mt_tbl {
int size;
int alloc; /* bit 30: MRB_MT_READONLY_BIT, bit 29: MRB_MT_FROZEN_BIT */
union mrb_mt_ptr *ptr;
mrb_mt_entry *ptr;
struct mrb_mt_tbl *next;
} mrb_mt_tbl;
@@ -50,12 +56,22 @@ typedef struct mrb_mt_tbl {
#define MRB_MT_PUBLIC 0 /* MRB_METHOD_PUBLIC_FL */
#define MRB_MT_PRIVATE 1 /* MRB_METHOD_PRIVATE_FL */
/* ROM table entry: { {.func=fn}, MRB_MT_KEY(sym, flags) } */
#define MRB_MT_ENTRY(fn, sym, flags) \
{ { .func = (fn) }, MRB_MT_KEY((sym), (flags)) }
/* ROM table initializer from entries array (auto-computes size) */
#define MRB_MT_ROM_TAB(entries) { \
(int)(sizeof(entries)/sizeof(entries[0])), \
(int)(sizeof(entries)/sizeof(entries[0])), \
(entries), NULL }
/* "removed" tombstone: MRB_MT_FUNC flag set with NULL function pointer.
This combination never occurs naturally (C functions are never NULL).
Unlike undef (proc=NULL without MRB_MT_FUNC), a removed marker makes
mt_get() return 0 ("not found"), blocking ROM chain walk while
allowing superclass lookup. */
#define MRB_MT_REMOVED_P(key, val) (((key)&MRB_MT_FUNC) && (val).func==NULL)
#define MRB_MT_REMOVED_P(e) (((e).key&MRB_MT_FUNC) && (e).val.func==NULL)
void mrb_mt_init_rom(struct RClass *c, mrb_mt_tbl *rom);
#endif