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experimental feature to access congruence closure of SimpleSolver

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This update includes an experimental feature to access a congruence closure data-structure after search.
It comes with several caveats as pre-processing is free to eliminate terms. It is therefore necessary to use a solver that does not eliminate the terms you want to track for congruence of. This is partially addressed by using SimpleSolver or incremental mode solving.

```python
from z3 import *
s = SimpleSolver()
x, y, z = Ints('x y z')
s.add(x == y)
s.add(y == z)
s.check()
print(s.root(x), s.root(y), s.root(z))
print(s.next(x), s.next(y), s.next(z))
```
This commit is contained in:
Nikolaj Bjorner 2022-12-30 21:41:27 -08:00
parent c0f1f33898
commit f6d411d54b
21 changed files with 145 additions and 12 deletions
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7
src/ast/converters/expr_inverter.h
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@ -24,6 +24,7 @@ protected:
ast_manager& m;
std::function<bool(expr*)> m_is_var;
generic_model_converter_ref m_mc;
bool m_produce_proofs = false;
bool uncnstr(expr* e) const { return m_is_var(e); }
bool uncnstr(unsigned num, expr * const * args) const;
@ -37,8 +38,9 @@ public:
virtual ~iexpr_inverter() {}
virtual void set_is_var(std::function<bool(expr*)>& is_var) { m_is_var = is_var; }
virtual void set_model_converter(generic_model_converter* mc) { m_mc = mc; }
virtual void set_produce_proofs(bool p) { m_produce_proofs = true; }
virtual bool operator()(func_decl* f, unsigned n, expr* const* args, expr_ref& new_expr, expr_ref& side_cond) = 0;
virtual bool operator()(func_decl* f, unsigned n, expr* const* args, expr_ref& new_expr, proof_ref& pr) = 0;
virtual bool mk_diff(expr* t, expr_ref& r) = 0;
virtual family_id get_fid() const = 0;
};
@ -49,9 +51,10 @@ class expr_inverter : public iexpr_inverter {
public:
expr_inverter(ast_manager& m);
~expr_inverter() override;
bool operator()(func_decl* f, unsigned n, expr* const* args, expr_ref& new_expr, expr_ref& side_cond) override;
bool operator()(func_decl* f, unsigned n, expr* const* args, expr_ref& new_expr, proof_ref& pr) override;
bool mk_diff(expr* t, expr_ref& r) override;
void set_is_var(std::function<bool(expr*)>& is_var) override;
void set_model_converter(generic_model_converter* mc) override;
void set_produce_proofs(bool p) override;
family_id get_fid() const override { return null_family_id; }
};