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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 Compiler_Unit; 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 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;