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gc.c: remove all matching entries in mrb_gc_unregister()

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Previously only the first match was removed, leaking duplicate
entries when the same object was registered multiple times.
Use two-pointer compaction for O(N) removal.

Fixes #6760.

Co-authored-by: Claude <noreply@anthropic.com>
This commit is contained in:
Yukihiro "Matz" Matsumoto
2026-03-25 15:24:01 +09:00
parent c2b588139f
commit ab249864cc
1 changed files with 6 additions and 6 deletions
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src/gc.c
+6 -6
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@@ -541,15 +541,15 @@ mrb_gc_unregister(mrb_state *mrb, mrb_value obj)
if (!mrb_array_p(table)) return;
struct RArray *a = mrb_ary_ptr(table);
mrb_ary_modify(mrb, a);
mrb_int len = ARY_LEN(a)-1;
mrb_int len = ARY_LEN(a);
mrb_value *ptr = ARY_PTR(a);
for (mrb_int i = 0; i <= len; i++) {
if (mrb_ptr(ptr[i]) == mrb_ptr(obj)) {
ARY_SET_LEN(a, len);
memmove(&ptr[i], &ptr[i + 1], (len - i) * sizeof(mrb_value));
break;
mrb_int w = 0;
for (mrb_int r = 0; r < len; r++) {
if (mrb_ptr(ptr[r]) != mrb_ptr(obj)) {
ptr[w++] = ptr[r];
}
}
ARY_SET_LEN(a, w);
}
MRB_API struct RBasic*