84 lines
4.4 KiB
Ada
84 lines
4.4 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT COMPILER COMPONENTS --
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-- --
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-- S Y S T E M . T R A C E B A C K --
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-- --
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-- S p e c --
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-- --
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-- --
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-- Copyright (C) 1999-2001 Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 2, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
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-- for more details. You should have received a copy of the GNU General --
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-- Public License distributed with GNAT; see file COPYING. If not, write --
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-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
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-- MA 02111-1307, USA. --
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-- --
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-- As a special exception, if other files instantiate generics from this --
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-- unit, or you link this unit with other files to produce an executable, --
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-- this unit does not by itself cause the resulting executable to be --
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-- covered by the GNU General Public License. This exception does not --
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-- however invalidate any other reasons why the executable file might be --
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-- covered by the GNU Public License. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
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-- --
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------------------------------------------------------------------------------
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-- This package provides a method for generating a traceback of the
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-- current execution location. The traceback shows the locations of
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-- calls in the call chain, up to either the top or a designated
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-- number of levels.
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pragma Polling (Off);
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-- We must turn polling off for this unit, because otherwise we get
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-- elaboration circularities with System.Exception_Tables.
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package System.Traceback is
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----------------
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-- Call_Chain --
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----------------
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procedure Call_Chain
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(Traceback : System.Address;
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Max_Len : Natural;
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Len : out Natural;
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Exclude_Min : System.Address := System.Null_Address;
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Exclude_Max : System.Address := System.Null_Address);
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-- Store up to Max_Len code locations in Traceback, corresponding to
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-- the current call chain.
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--
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-- Traceback is the address of an array of addresses where the
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-- result will be stored.
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--
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-- Max_Len is the length of the Traceback array. If the call chain
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-- is longer than this, then additional entries are discarded, and
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-- the traceback is missing some of the highest level entries.
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--
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-- Len is the returned actual number of addresses stored
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-- in the Traceback array.
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--
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-- Exclude_Min/Exclude_Max, if non null, provide a range of addresses
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-- to ignore from the computation of the traceback.
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--
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-- On return, the Traceback array is filled in, and Len indicates
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-- the number of stored entries. The first entry is the most recent
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-- call, and the last entry is the highest level call.
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function C_Call_Chain
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(Traceback : System.Address;
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Max_Len : Natural)
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return Natural;
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pragma Export (C, C_Call_Chain, "system__traceback__c_call_chain");
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-- Version that can be used directly from C.
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end System.Traceback;
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