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Add SASSERT invariants and pre/postconditions to Nielsen seq solver (#9216)

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* Initial plan

* Add SASSERT invariants and pre/postconditions to Nielsen seq solver

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

* Add clarifying comment to m_str_eq.empty() postcondition

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Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: NikolajBjorner <3085284+NikolajBjorner@users.noreply.github.com>
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Copilot 2026-04-02 21:09:23 -07:00 • committed by GitHub
parent bbb704e63c
commit fa89910452
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2 changed files with 34 additions and 3 deletions
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15
src/smt/seq/seq_nielsen.h
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@ -586,8 +586,16 @@ namespace seq {
vector<str_mem> const& str_mems() const { return m_str_mem; }
vector<str_mem>& str_mems() { return m_str_mem; }
void add_str_eq(str_eq const& eq) { m_str_eq.push_back(eq); }
void add_str_mem(str_mem const& mem) { m_str_mem.push_back(mem); }
void add_str_eq(str_eq const& eq) {
SASSERT(eq.m_lhs != nullptr);
SASSERT(eq.m_rhs != nullptr);
m_str_eq.push_back(eq);
}
void add_str_mem(str_mem const& mem) {
SASSERT(mem.m_str != nullptr);
SASSERT(mem.m_regex != nullptr);
m_str_mem.push_back(mem);
}
bool add_constraint(constraint const &ic);
vector<constraint> const& constraints() const { return m_constraints; }
@ -857,6 +865,9 @@ namespace seq {
void create_root() {
SASSERT(!root());
set_root(mk_node());
SASSERT(m_root != nullptr);
SASSERT(m_root->id() == 0);
SASSERT(m_nodes[0] == m_root);
}
// path of edges from root to sat_node (set when sat_node is set)