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symbol.c: use rb_gc_mark_and_move over rb_gc_location

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The `p->field = rb_gc_location(p->field)` isn't ideal because it means all
references are rewritten on compaction, regardless of whether the referenced
object has moved. This isn't good for caches nor for Copy-on-Write.

`rb_gc_mark_and_move` avoid needless writes, and most of the time allow to
have a single function for both marking and updating references.
This commit is contained in:
Jean Boussier 2025-08-07 14:47:37 +02:00
parent 5bcfc53d6f
commit 1986d775cd
3 changed files with 6 additions and 16 deletions
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15
symbol.c
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@ -371,21 +371,12 @@ Init_sym(void)
}
void
rb_sym_global_symbols_mark(void)
rb_sym_global_symbols_mark_and_move(void)
{
rb_symbols_t *symbols = &ruby_global_symbols;
rb_gc_mark_movable(symbols->sym_set);
rb_gc_mark_movable(symbols->ids);
}
void
rb_sym_global_symbols_update_references(void)
{
rb_symbols_t *symbols = &ruby_global_symbols;
symbols->sym_set = rb_gc_location(symbols->sym_set);
symbols->ids = rb_gc_location(symbols->ids);
rb_gc_mark_and_move(&symbols->sym_set);
rb_gc_mark_and_move(&symbols->ids);
}
static int