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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) 2003-2009, 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 3,  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.                                     --

--                                                                          --

-- As a special exception under Section 7 of GPL version 3, you are granted --

-- additional permissions described in the GCC Runtime Library Exception,   --

-- version 3.1, as published by the Free Software Foundation.               --

--                                                                          --

-- You should have received a copy of the GNU General Public License and    --

-- a copy of the GCC Runtime Library Exception along with this program;     --

-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --

-- <http://www.gnu.org/licenses/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  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.

pragma Compiler_Unit;

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;