Z3 sources

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

lib/id_gen.h

@@ -0,0 +1,83 @@
+/*++
+Copyright (c) 2006 Microsoft Corporation
+
+Module Name:
+
+    id_gen.h
+
+Abstract:
+
+    Basic support for generating & recycling ids.
+
+Author:
+
+    Leonardo de Moura (leonardo) 2008-02-02.
+
+Revision History:
+
+--*/
+#ifndef _ID_GEN_H_
+#define _ID_GEN_H_
+
+#include"vector.h"
+#include"util.h"
+
+class id_gen {
+    unsigned        m_next_id;
+    unsigned_vector m_free_ids;
+public:
+    id_gen(unsigned start = 0):m_next_id(start) {}
+    
+    unsigned mk() {
+        unsigned r;
+        if (m_free_ids.empty()) {
+            r = m_next_id;
+            m_next_id++;
+        }
+        else {
+            r = m_free_ids.back();
+            m_free_ids.pop_back();
+        }
+        return r;
+    }
+    
+    void recycle(unsigned id) { 
+        if (memory::is_out_of_memory())
+            return;
+        m_free_ids.push_back(id); 
+    }
+    
+    void reset(unsigned start = 0) {
+        m_next_id = start;
+        m_free_ids.reset();
+    }
+
+    void cleanup(unsigned start = 0) {
+        m_next_id = start;
+        m_free_ids.finalize();
+    }
+    
+    /**
+       \brief Return N if the range of ids generated by this module is in the set [0..N)
+    */
+    unsigned get_id_range() const { return m_next_id; }
+
+
+    /**
+       \brief Debugging support method: set m_next_id to the least value id' s.t. id' >= id and id' is not in m_free_ids.
+       This method is only used to create small repros that exposes bugs in Z3.
+    */
+    unsigned set_next_id(unsigned id) {
+        m_next_id = id;
+        while (std::find(m_free_ids.begin(), m_free_ids.end(), m_next_id) != m_free_ids.end())
+            m_next_id++;
+        return m_next_id;
+    }
+
+    void display_free_ids(std::ostream & out) {
+        ::display(out, m_free_ids.begin(), m_free_ids.end());
+    }
+
+};
+
+#endif /* _ID_GEN_H_ */