Z3 sources

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

lib/expr_stat.h

@@ -0,0 +1,50 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    expr_stat.h
+
+Abstract:
+
+    Expression statistics (symbol count, var count, depth, ...)
+    
+    All functions in these module assume expressions do not contain
+    nested quantifiers.
+    
+Author:
+
+    Leonardo de Moura (leonardo) 2008-02-05.
+
+Revision History:
+
+--*/
+#ifndef _EXPR_STAT_H_
+#define _EXPR_STAT_H_
+
+class expr;
+
+struct expr_stat {
+    unsigned m_sym_count; // symbol count
+    unsigned m_depth;     // depth
+    unsigned m_const_count; // constant count
+    unsigned m_max_var_idx;  
+    bool     m_ground;
+    expr_stat():m_sym_count(0), m_depth(0), m_const_count(0), m_max_var_idx(0), m_ground(true) {}
+};
+
+/**
+   \brief Collect statistics regarding the given expression. 
+
+   \warning This function traverses the dag as a tree.
+*/
+void get_expr_stat(expr * n, expr_stat & r);
+
+/**
+   \brief Return the number of symbols in \c n.
+
+   \warning This function traverses the dag as a tree.
+*/
+unsigned get_symbol_count(expr * n);
+
+#endif /* _EXPR_STAT_H_ */