first attempts at getting to the bvsls from opt_context.

src/tactic/sls/bvsls_opt_engine.cpp

@@ -0,0 +1,69 @@
+/*++
+Copyright (c) 2014 Microsoft Corporation
+
+Module Name:
+
+    bvsls_opt_engine.cpp
+
+Abstract:
+
+    Optimization extensions to bvsls
+
+Author:
+
+    Christoph (cwinter) 2014-03-28
+
+Notes:
+
+--*/
+#include "bvsls_opt_engine.h"
+
+bvsls_opt_engine::bvsls_opt_engine(ast_manager & m, params_ref const & p) :
+    sls_engine(m, p)
+{
+}
+
+bvsls_opt_engine::~bvsls_opt_engine()
+{    
+}
+
+bvsls_opt_engine::optimization_result bvsls_opt_engine::optimize(expr_ref const & objective)
+{
+    SASSERT(m_bv_util.is_bv(objective));
+    m_tracker.initialize(m_assertions);
+    m_restart_limit = _RESTART_LIMIT_;
+
+    optimization_result res(m_manager);
+
+    do {
+        checkpoint();
+
+        IF_VERBOSE(1, verbose_stream() << "Optimizing... restarts left:" << (m_max_restarts - m_stats.m_restarts) << std::endl; );
+        res.is_sat = search();
+
+        if (res.is_sat == l_undef)
+        {
+#if _RESTART_INIT_
+            m_tracker.randomize();
+#else
+            m_tracker.reset(m_assertions);
+#endif
+        }
+    } while (m_stats.m_stopwatch.get_current_seconds() < _TIMELIMIT_ &&
+             res.is_sat != l_true && m_stats.m_restarts++ < m_max_restarts);    
+
+    if (res.is_sat)
+        res.optimum = maximize(objective);
+
+    return res;
+}
+
+expr_ref bvsls_opt_engine::maximize(expr_ref const & objective)
+{
+    expr_ref res(m_manager);
+    res = m_bv_util.mk_numeral(0, m_bv_util.get_bv_size(objective));
+
+    // TODO.
+
+    return res;
+}