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gc.c: mark leaf objects directly without gray stack

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Leaf types (String, Integer, BigInt, Complex, CPTR) have no children
besides their class pointer. Mark them black immediately in
mrb_gc_mark() instead of pushing to the gray stack, reducing gray
stack pressure and overflow frequency.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-03-11 09:20:35 +09:00
parent 60cde305c1
commit cfa422b872
1 changed files with 25 additions and 0 deletions
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src/gc.c
+25
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@@ -844,6 +844,31 @@ mrb_gc_mark(mrb_state *mrb, struct RBasic *obj)
if (!is_white(obj)) return;
if (is_red(obj)) return;
mrb_assert((obj)->tt != MRB_TT_FREE);
switch (obj->tt) {
case MRB_TT_STRING:
/* most strings have no children; handle fshared inline */
paint_black(obj);
mrb_gc_mark(mrb, (struct RBasic*)obj->c);
if (RSTR_FSHARED_P(obj)) {
struct RString *s = (struct RString*)obj;
mrb_gc_mark(mrb, (struct RBasic*)s->as.heap.aux.fshared);
}
return;
case MRB_TT_INTEGER:
case MRB_TT_CPTR:
#ifdef MRB_USE_BIGINT
case MRB_TT_BIGINT:
#endif
#ifdef MRB_USE_COMPLEX
case MRB_TT_COMPLEX:
#endif
/* leaf types: no children besides class */
paint_black(obj);
mrb_gc_mark(mrb, (struct RBasic*)obj->c);
return;
default:
break;
}
add_gray_list(&mrb->gc, obj);
}