old_params ==> front_end_params. Isolated abstract solver interface

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

src/solver/check_sat_result.h

@@ -0,0 +1,77 @@
+/*++
+Copyright (c) 2012 Microsoft Corporation
+
+Module Name:
+
+    check_sat_result.h
+
+Abstract:
+    Abstract interface for storing the result produced by 
+    a check_sat like command
+
+Author:
+
+    Leonardo (leonardo) 2012-01-23
+
+Notes:
+
+--*/
+#ifndef _CHECK_SAT_RESULT_H_
+#define _CHECK_SAT_RESULT_H_
+
+#include"model.h"
+#include"lbool.h"
+#include"statistics.h"
+
+/**
+   \brief Abstract interface for the result of a (check-sat) like command.
+   It encapsulates information such as:
+      - the actual result: l_true (satisfiable), l_false (unsatisfiable), l_undef (unknown)
+      - statistics
+      - model (if the result is satisfiable)
+      - proof (if the result is unsatisfiable)
+      - unsat-core (if the result is unsatisfiable)
+      - reason-unknown (if the result is unknown, i.e., the solver failed to solve the problem)
+      - label (if the result is satisfiable) this is legacy for Boogie
+      
+*/
+class check_sat_result {
+protected:
+    unsigned    m_ref_count;
+    lbool       m_status; 
+public:
+    check_sat_result():m_ref_count(0), m_status(l_undef) {}
+    virtual ~check_sat_result() {}
+    void inc_ref() { m_ref_count++; }
+    void dec_ref() { SASSERT(m_ref_count > 0); m_ref_count--; if (m_ref_count == 0) dealloc(this); }
+    void set_status(lbool r) { m_status = r; }
+    lbool status() const { return m_status; }
+    virtual void collect_statistics(statistics & st) const = 0;
+    virtual void get_unsat_core(ptr_vector<expr> & r) = 0;
+    virtual void get_model(model_ref & m) = 0;
+    virtual proof * get_proof() = 0;
+    virtual std::string reason_unknown() const = 0;
+    virtual void get_labels(svector<symbol> & r) = 0;
+};
+
+/**
+   \brief Very simple implementation of the check_sat_result object.
+*/
+struct simple_check_sat_result : public check_sat_result {
+    statistics      m_stats;
+    model_ref       m_model;
+    expr_ref_vector m_core;
+    proof_ref       m_proof;
+    std::string     m_unknown;
+
+    simple_check_sat_result(ast_manager & m);
+    virtual ~simple_check_sat_result();
+    virtual void collect_statistics(statistics & st) const;
+    virtual void get_unsat_core(ptr_vector<expr> & r);
+    virtual void get_model(model_ref & m);
+    virtual proof * get_proof();
+    virtual std::string reason_unknown() const;
+    virtual void get_labels(svector<symbol> & r);
+};
+
+#endif