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New invariant for dlist (#7294)

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* unit tests for dlist.h

* new invariant for dlist: should be circular. avoid infinite loop

* remove dlist test commit

* format

* format

* Update dlist.h

---------

Co-authored-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
LiviaSun 2024-07-18 10:06:58 -07:00 • committed by GitHub
parent 9073da4ee6
commit cf4d0e74a5
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1 changed files with 17 additions and 9 deletions
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26
src/util/dlist.h
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@ -155,15 +155,23 @@ public:
elem->init(elem);
}
bool invariant() const {
auto* e = this;
do {
if (e->m_next->m_prev != e)
return false;
e = e->m_next;
}
while (e != this);
return true;
bool invariant() const {
auto* e = this;
const T* slow = static_cast<const T*>(this);
const T* fast = m_next;
bool looped = false;
// m_next of each node should point back to m_prev of the following node,
// and m_prev of each node should point forward to m_next of the preceding node.
while (slow != fast) {
if (fast->m_prev->m_next != fast || fast->m_next->m_prev != fast)
return false;
fast = fast->m_next;
looped = looped || (fast == static_cast<const T*>(this));
if (!looped && fast == m_next)
// We should be able to traverse back to the starting node.
return false;
}
return true;
}
static bool contains(T const* list, T const* elem) {