Z3 sources

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

lib/dl_mk_slice.h

@@ -0,0 +1,107 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    dl_mk_slice.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Krystof Hoder (t-khoder) 2010-10-4.
+
+Revision History:
+
+--*/
+#ifndef _DL_MK_SLICE_H_
+#define _DL_MK_SLICE_H_
+
+#include"dl_context.h"
+#include"dl_rule_set.h"
+#include"uint_set.h"
+#include"dl_rule_transformer.h"
+
+namespace datalog {
+
+    /**
+       \brief Implements a slicing rule transformation.
+    */
+    class mk_slice : public rule_transformer::plugin {
+        class slice_proof_converter;
+        class slice_model_converter;
+        context&      m_ctx;
+        ast_manager&  m;
+        rule_manager& rm;
+        svector<bool>   m_input;
+        svector<bool>   m_output;
+        expr_ref_vector m_solved_vars;
+        svector<bool>   m_var_is_sliceable;
+        obj_map<func_decl, func_decl*>  m_predicates;        
+        obj_map<func_decl, bit_vector> m_sliceable;
+        ast_ref_vector  m_pinned;
+        slice_proof_converter*      m_pc;        
+        slice_model_converter*      m_mc;
+
+        void reset();
+
+        void init(rule_set const& source);
+
+        void saturate(rule_set const& source);
+        
+        void display(std::ostream& out);
+
+        bool prune_rule(rule& r);
+        
+        void init_vars(rule& r);
+
+        void init_vars(app* p, bool is_output, bool is_neg_tail);
+
+        bool finalize_vars(app* p);
+
+        unsigned num_vars() const { return m_input.size(); }
+
+        bit_vector& get_predicate_slice(func_decl* p);
+
+        bit_vector& get_predicate_slice(app* p) { return get_predicate_slice(p->get_decl()); }
+
+        bool is_eq(expr* e, unsigned& v, expr_ref& r);
+
+        void add_free_vars(uint_set& s, expr* e);
+
+        void add_var(unsigned idx);
+
+        bool is_output(expr* e);
+
+        bool is_output(unsigned idx);
+
+        void update_rules(rule_set const& src, rule_set& dst);
+
+        void update_rule(rule& r, rule_set& dst);
+
+        expr_ref_vector get_tail_conjs(rule const& r);
+
+        void declare_predicates();
+         
+        bool rule_updated(rule const& r);
+
+        void update_predicate(app* p, app_ref& q);
+
+    public:
+        /**
+           \brief Create slice rule transformer for \c goal predicate. When applying the transformer,
+           the \c goal must be present in the \c rule_set that is being transformed.
+         */
+        mk_slice(context & ctx);
+        
+        rule_set * operator()(rule_set const & source, model_converter_ref& mc, proof_converter_ref& pc);
+
+        func_decl* get_predicate(func_decl* p) { func_decl* q = p; m_predicates.find(p, q); return q; }
+    };
+
+};
+
+#endif /* _DL_MK_SLICE_H_ */
+