Z3 sources

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

lib/th_rewriter.h

@@ -0,0 +1,65 @@
+/*++
+Copyright (c) 2011 Microsoft Corporation
+
+Module Name:
+
+    th_rewriter.h
+
+Abstract:
+
+    Rewriter for applying all builtin (cheap) theory rewrite rules.
+
+Author:
+
+    Leonardo (leonardo) 2011-04-07
+
+Notes:
+
+--*/
+#ifndef _TH_REWRITER_H_
+#define _TH_REWRITER_H_
+
+#include"ast.h"
+#include"rewriter_types.h"
+#include"params.h"
+
+class expr_substitution;
+
+class th_rewriter {
+    struct     imp;
+    imp *      m_imp;
+    params_ref m_params;
+public:
+    th_rewriter(ast_manager & m, params_ref const & p = params_ref());
+    ~th_rewriter();
+
+    ast_manager & m () const;
+
+    void updt_params(params_ref const & p);
+    static void get_param_descrs(param_descrs & r);
+
+    unsigned get_cache_size() const;
+    unsigned get_num_steps() const;
+
+    void operator()(expr_ref& term);
+    void operator()(expr * t, expr_ref & result);
+    void operator()(expr * t, expr_ref & result, proof_ref & result_pr);
+    void operator()(expr * n, unsigned num_bindings, expr * const * bindings, expr_ref & result);
+
+    void cancel() { set_cancel(true); }
+    void reset_cancel() { set_cancel(false); }
+    void set_cancel(bool f);
+    void cleanup();
+    void reset();
+
+    void set_substitution(expr_substitution * s);
+    
+    // Dependency tracking is very coarse. 
+    // The rewriter just keeps accumulating the dependencies of the used substitutions.
+    // The following methods are used to recover and reset them.
+    // Remark: reset_used_dependecies will reset the internal cache if get_used_dependencies() != 0
+    expr_dependency * get_used_dependencies();
+    void reset_used_dependencies();
+};
+
+#endif