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-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- S Y S T E M . T R A C E B A C K --
--- --
--- S p e c --
--- --
--- Copyright (C) 1999-2009, Free Software Foundation, Inc. --
--- --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
--- This package provides a method for generating a traceback of the
--- current execution location. The traceback shows the locations of
--- calls in the call chain, up to either the top or a designated
--- number of levels.
-
-pragma Warnings (Off);
-pragma Compiler_Unit;
-pragma Warnings (On);
-
-pragma Polling (Off);
--- We must turn polling off for this unit, because otherwise we get
--- elaboration circularities with System.Exception_Tables.
-
-package System.Traceback is
-
- ----------------
- -- Call_Chain --
- ----------------
-
- procedure Call_Chain
- (Traceback : System.Address;
- Max_Len : Natural;
- Len : out Natural;
- Exclude_Min : System.Address := System.Null_Address;
- Exclude_Max : System.Address := System.Null_Address;
- Skip_Frames : Natural := 1);
- -- Store up to Max_Len code locations in Traceback, corresponding to
- -- the current call chain.
- --
- -- Traceback is the address of an array of addresses where the
- -- result will be stored.
- --
- -- Max_Len is the length of the Traceback array. If the call chain
- -- is longer than this, then additional entries are discarded, and
- -- the traceback is missing some of the highest level entries.
- --
- -- Len is the returned actual number of addresses stored
- -- in the Traceback array.
- --
- -- Exclude_Min/Exclude_Max, if non null, provide a range of addresses
- -- to ignore from the computation of the traceback.
- --
- -- Skip_Frames says how many of the most recent calls should at least
- -- be excluded from the result, regardless of the exclusion bounds and
- -- starting with this procedure itself: 1 means exclude the frame for
- -- this procedure, 2 means 1 + exclude the frame for this procedure's
- -- caller, ...
- --
- -- On return, the Traceback array is filled in, and Len indicates
- -- the number of stored entries. The first entry is the most recent
- -- call, and the last entry is the highest level call.
-
- function C_Call_Chain
- (Traceback : System.Address;
- Max_Len : Natural)
- return Natural;
- pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");
- -- Version that can be used directly from C
-
-end System.Traceback;