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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . T R A C E B A C K _ E N T R I E S --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2003-2005 Free Software Foundation, Inc. --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the contents of the part following the private keyword. --
+-- --
+-- GNAT is free software; you can redistribute it and/or modify it under --
+-- terms of the GNU General Public License as published by the Free Soft- --
+-- ware Foundation; either version 2, or (at your option) any later ver- --
+-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
+-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
+-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
+-- for more details. You should have received a copy of the GNU General --
+-- Public License distributed with GNAT; see file COPYING. If not, write --
+-- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
+-- Boston, MA 02110-1301, USA. --
+-- --
+-- As a special exception, if other files instantiate generics from this --
+-- unit, or you link this unit with other files to produce an executable, --
+-- this unit does not by itself cause the resulting executable to be --
+-- covered by the GNU General Public License. This exception does not --
+-- however invalidate any other reasons why the executable file might be --
+-- covered by the GNU Public License. --
+-- --
+-- GNAT was originally developed by the GNAT team at New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package offers an abstraction of what is stored in traceback arrays
+-- for call-chain computation purposes. By default, as defined in this
+-- version of the package, an entry is a mere code location representing the
+-- address of a call instruction part of the call-chain.
+
+package System.Traceback_Entries is
+ pragma Preelaborate;
+
+ subtype Traceback_Entry is System.Address;
+ -- This subtype defines what each traceback array entry contains
+
+ Null_TB_Entry : constant Traceback_Entry := System.Null_Address;
+ -- This is the value to be used when initializing an entry
+
+ function PC_For (TB_Entry : Traceback_Entry) return System.Address;
+ pragma Inline (PC_For);
+ -- Returns the address of the call instruction associated with the
+ -- provided entry.
+
+ function TB_Entry_For (PC : System.Address) return Traceback_Entry;
+ pragma Inline (TB_Entry_For);
+ -- Returns an entry representing a frame for a call instruction at PC
+
+end System.Traceback_Entries;