Z3 sources

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

lib/expr_rand.h

@@ -0,0 +1,61 @@
+/*++
+Copyright (c) 2008 Microsoft Corporation
+
+Module Name:
+
+    expr_rand.h
+
+Abstract:
+
+    Generator of random ASTs.
+
+Author:
+
+    Nikolaj Bjorner 2008-04-10.
+
+Revision History:
+
+--*/
+#ifndef _EXPR_RAND_H_
+#define _EXPR_RAND_H_
+
+#include"ast.h"
+#include"obj_hashtable.h"
+
+class expr_rand {
+    ast_manager& m_manager;
+    unsigned     m_num_vars;
+    unsigned     m_num_apps;
+    unsigned     m_num_nodes;
+    unsigned     m_max_steps;
+    random_gen   m_random;
+
+    typedef obj_map<sort, expr_ref_vector*> map_t;
+
+    func_decl_ref_vector m_funcs;
+    map_t                m_nodes;
+    
+public:
+    expr_rand(ast_manager& m);
+    ~expr_rand();
+    void add_var(sort*);
+    void add_func_decl(func_decl*);
+    void add_expr(expr* t);
+    void get_next(sort* s, expr_ref& e);
+    void initialize_bv(unsigned num_vars);
+    void initialize_arith(unsigned num_vars);
+    void initialize_array(unsigned num_vars, sort* dom, sort* rng);
+    void initialize_basic(unsigned amplification);
+    void seed(unsigned n) { m_random = random_gen(n); }
+                       
+private:
+    void walk();
+    void walk(unsigned n);
+    
+    func_decl* choose_func_decl();
+    expr*      choose_expr(sort*);
+
+};
+
+
+#endif