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Assert that non-empty LINK_ANCHOR does not loop

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After any `LINK_ELEMENT` sequence is added, `LINK_ANCHOR` must not
loop.
This commit is contained in:
Nobuyoshi Nakada 2024-11-28 15:13:52 +09:00
parent 84bf0b3774
commit 319ac31529
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GPG Key ID: 3582D74E1FEE4465
Notes: git 2024-11-28 07:51:28 +00:00 
Merged: https://github.com/ruby/ruby/pull/12195
1 changed files with 5 additions and 0 deletions
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5
compile.c
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@ -1290,10 +1290,15 @@ static void
APPEND_LIST(ISEQ_ARG_DECLARE LINK_ANCHOR *const anc1, LINK_ANCHOR *const anc2)
{
if (anc2->anchor.next) {
/* LINK_ANCHOR must not loop */
RUBY_ASSERT(anc2->last != &anc2->anchor);
anc1->last->next = anc2->anchor.next;
anc2->anchor.next->prev = anc1->last;
anc1->last = anc2->last;
}
else {
RUBY_ASSERT(anc2->last == &anc2->anchor);
}
verify_list("append", anc1);
}
#if CPDEBUG < 0