wip - proof checking, add support for distinct, other fixes

src/sat/smt/tseitin_theory_checker.h

@@ -0,0 +1,74 @@
+/*++
+Copyright (c) 2022 Microsoft Corporation
+
+Module Name:
+
+    tseitin_theory_checker.h
+
+Abstract:
+
+    Plugin for checking tseitin internalization
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2022-10-07
+
+
+--*/
+#pragma once
+
+#include "util/obj_pair_set.h"
+#include "ast/ast_trail.h"
+#include "ast/ast_util.h"
+#include "sat/smt/euf_proof_checker.h"
+#include <iostream>
+
+namespace tseitin {
+
+    class theory_checker : public euf::theory_checker_plugin {
+        ast_manager& m;
+
+        expr_fast_mark1 m_mark;
+        expr_fast_mark2 m_nmark;
+        bool equiv(expr* a, expr* b);
+        
+        void mark(expr* a) { m_mark.mark(a); }
+        bool is_marked(expr* a) { return m_mark.is_marked(a); }
+
+        void nmark(expr* a) { m_nmark.mark(a); }
+        bool is_nmarked(expr* a) { return m_nmark.is_marked(a); }
+
+        void complement_mark(expr* a) {
+            m_mark.mark(a);
+            if (m.is_not(a, a))
+                m_nmark.mark(a);
+        }
+
+        bool is_complement(expr* a) {
+            if (m.is_not(a, a))
+                return is_marked(a);
+            else
+                return is_nmarked(a);
+        }
+
+        struct scoped_mark {
+            theory_checker& pc;
+            scoped_mark(theory_checker& pc): pc(pc) {}
+            ~scoped_mark() { pc.m_mark.reset(); pc.m_nmark.reset(); }
+        };
+    public:
+        theory_checker(ast_manager& m): 
+            m(m) {
+        }
+
+        expr_ref_vector clause(app* jst) override;
+        
+        bool check(app* jst) override;
+
+        void register_plugins(euf::theory_checker& pc) override {
+            pc.register_plugin(symbol("tseitin"), this);
+        }
+        
+    };
+
+}