new files

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/ast/rewriter/func_decl_replace.h

@@ -0,0 +1,45 @@
+/*++
+Copyright (c) 2019 Microsoft Corporation
+
+Module Name:
+
+    func_decl_replace.h
+
+Abstract:
+
+    Replace functions in expressions.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2019-03-28
+
+Revision History:
+
+
+--*/
+
+#ifndef FUNC_DECL_REPLACE_H_
+#define FUNC_DECL_REPLACE_H_
+
+#include "ast/ast.h"
+
+class func_decl_replace {
+    ast_manager& m;
+    obj_map<func_decl, func_decl*> m_subst;
+    obj_map<expr, expr*> m_cache;
+    ptr_vector<expr> m_todo, m_args;
+    expr_ref_vector m_refs;
+
+public:
+    func_decl_replace(ast_manager& m): m(m), m_refs(m) {}
+
+    void insert(func_decl* src, func_decl* dst) { m_subst.insert(src, dst); }
+
+    expr_ref operator()(expr* e);
+
+    void reset();
+
+    bool empty() const { return m_subst.empty(); }
+};
+
+#endif /* FUNC_DECL_REPLACE_H_ */