1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--              S Y S T E M . T R A C E B A C K _ E N T R I E S             --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2003-2013, Free Software Foundation, Inc.         --
10--                                                                          --
11-- This specification is derived from the Ada Reference Manual for use with --
12-- GNAT. The copyright notice above, and the license provisions that follow --
13-- apply solely to the  contents of the part following the private keyword. --
14--                                                                          --
15-- GNAT is free software;  you can  redistribute it  and/or modify it under --
16-- terms of the  GNU General Public License as published  by the Free Soft- --
17-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
18-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
19-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
20-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
21--                                                                          --
22-- As a special exception under Section 7 of GPL version 3, you are granted --
23-- additional permissions described in the GCC Runtime Library Exception,   --
24-- version 3.1, as published by the Free Software Foundation.               --
25--                                                                          --
26-- You should have received a copy of the GNU General Public License and    --
27-- a copy of the GCC Runtime Library Exception along with this program;     --
28-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
29-- <http://www.gnu.org/licenses/>.                                          --
30--                                                                          --
31-- GNAT was originally developed  by the GNAT team at  New York University. --
32-- Extensive contributions were provided by Ada Core Technologies Inc.      --
33--                                                                          --
34------------------------------------------------------------------------------
35
36--  This package offers an abstraction of what is stored in traceback arrays
37--  for call-chain computation purposes. By default, as defined in this
38--  version of the package, an entry is a mere code location representing the
39--  address of a call instruction part of the call-chain.
40
41pragma Compiler_Unit_Warning;
42
43package System.Traceback_Entries is
44   pragma Preelaborate;
45
46   subtype Traceback_Entry is System.Address;
47   --  This subtype defines what each traceback array entry contains
48
49   Null_TB_Entry : constant Traceback_Entry := System.Null_Address;
50   --  This is the value to be used when initializing an entry
51
52   function PC_For (TB_Entry : Traceback_Entry) return System.Address;
53   pragma Inline (PC_For);
54   --  Returns the address of the call instruction associated with the
55   --  provided entry.
56
57   function TB_Entry_For (PC : System.Address) return Traceback_Entry;
58   pragma Inline (TB_Entry_For);
59   --  Returns an entry representing a frame for a call instruction at PC
60
61end System.Traceback_Entries;
62