Z3 sources

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

lib/dl_costs.h

@@ -0,0 +1,115 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    dl_costs.h
+
+Abstract:
+
+    <abstract>
+
+Author:
+
+    Krystof Hoder (t-khoder) 2010-09-20.
+
+Revision History:
+
+--*/
+
+#ifndef _DL_COSTS_H_
+#define _DL_COSTS_H_
+
+#include<iosfwd>
+
+#include "ast.h"
+
+class stopwatch;
+
+namespace datalog {
+
+    class context;
+    class rule;
+
+    class cost_recorder;
+
+    struct costs {
+        typedef unsigned time_type;
+
+        time_type milliseconds;
+        unsigned instructions;
+
+        costs();
+
+        bool empty() const;
+        void reset();
+
+        costs operator-(const costs & o) const;
+        void operator+=(const costs & o);
+
+        bool passes_thresholds(context & ctx) const;
+
+        void output(std::ostream & out) const;
+    };
+
+
+    class accounted_object {
+        friend class cost_recorder;
+
+        context * m_context;
+        rule * m_parent_object;
+
+        costs m_current_cost;
+        costs m_processed_cost;
+        bool m_being_recorded;
+    protected:
+        accounted_object() : m_context(0), m_parent_object(0), m_being_recorded(false) {}
+        ~accounted_object();
+    public:
+
+        void set_accounting_parent_object(context & ctx, rule * parent);
+        rule * get_parent_object() const { return m_parent_object; }
+
+        costs & get_current_costs() { return m_current_cost; }
+        const costs & get_current_costs() const { return m_current_cost; }
+        const costs & get_processed_costs() const { return m_processed_cost; }
+        void get_total_cost(costs & result) const;
+        bool being_recorded() const { return m_being_recorded; }
+
+        void process_costs();
+
+        bool passes_output_thresholds(context & ctx) const;
+        void output_profile(context & ctx, std::ostream & out) const;
+
+    private:
+        //private and undefined copy constructor and operator= to avoid the default ones
+        accounted_object(const accounted_object &);
+        accounted_object& operator=(const accounted_object &);
+    };
+
+
+    class cost_recorder {
+        accounted_object * m_obj;
+        //it's a pointer to avoid everything depending on the stopwatch.h 
+        //(and transitively then on windows.h) header file
+        stopwatch * m_stopwatch;
+
+        bool m_running;
+        uint64 m_last_time;
+    public:
+        cost_recorder();
+        ~cost_recorder();
+        /**
+           \brief Start recording costs for the next object.
+
+           If the recording of the previous object did not finish, it will be finished here.
+           Also, it will be done more efficiently than if the \c finish() function was called
+           before separately.
+         */
+        void start(accounted_object *);
+        void finish() { start(0); }
+    };
+};
+
+#endif /* _DL_COSTS_H_ */
+