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Add simplification customization for SMTLIB2

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Add the ability to customize incremental pre-processing simplification for the SMTLIB2 front-end. The main new capability is to use pre-processing tactics in incremental mode that were previously not available. The main new capabilities are
- solve-eqs
- reduce-args
- elim-unconstrained
There are several more. Documentation and exposed simplifiers are populated incrementally. The current set of supported simplifiers can be inspected by using z3 with the --simplifiers flag or referring to https://microsoft.github.io/z3guide/docs/strategies/simplifiers

Some pending features are:
- add the ability to update parameters to simplifiers similar to how tactics can be controlled using parameters.
- expose simplification solvers over the binary API.
This commit is contained in:
Nikolaj Bjorner 2023-01-30 22:38:51 -08:00
parent dd0decfe5d
commit 6022c17131
32 changed files with 370 additions and 69 deletions
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14
src/ast/simplifiers/dependent_expr_state.h
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@ -32,6 +32,7 @@ Author:
#include "util/trail.h"
#include "util/statistics.h"
#include "util/params.h"
#include "util/z3_exception.h"
#include "ast/converters/model_converter.h"
#include "ast/simplifiers/dependent_expr.h"
#include "ast/simplifiers/model_reconstruction_trail.h"
@ -98,6 +99,17 @@ public:
bool has_quantifiers();
};
class default_dependent_expr_state : public dependent_expr_state {
public:
default_dependent_expr_state(ast_manager& m): dependent_expr_state(m) {}
virtual unsigned qtail() const { return 0; }
virtual dependent_expr const& operator[](unsigned i) { throw default_exception("unexpected access"); }
virtual void update(unsigned i, dependent_expr const& j) { throw default_exception("unexpected update"); }
virtual void add(dependent_expr const& j) { throw default_exception("unexpected addition"); }
virtual bool inconsistent() { return false; }
virtual model_reconstruction_trail& model_trail() { throw default_exception("unexpected access to model reconstruction"); }
};
inline std::ostream& operator<<(std::ostream& out, dependent_expr_state& st) {
return st.display(out);
}
@ -150,3 +162,5 @@ public:
ast_manager& get_manager() { return m; }
dependent_expr_state& get_fmls() { return m_fmls; }
};
typedef std::function<dependent_expr_simplifier*(ast_manager&, const params_ref&, dependent_expr_state& s)> simplifier_factory;