88 lines
4.5 KiB
Ada
88 lines
4.5 KiB
Ada
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------------------------------------------------------------------------------
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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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-- Copyright (C) 1999-2015, 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 3, 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. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides a method for generating a traceback of the current
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-- execution location. The traceback shows the locations of calls in the call
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-- chain, up to either the top or a designated number of levels.
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pragma Compiler_Unit_Warning;
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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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with System.Traceback_Entries;
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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 : in out System.Traceback_Entries.Tracebacks_Array;
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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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Skip_Frames : Natural := 1);
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-- Store up to Max_Len code locations in Traceback, corresponding to the
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-- current call chain.
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--
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-- Traceback is an array of addresses where the 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 is
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-- longer than this, then additional entries are discarded, and the
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-- traceback is missing some of the highest level entries.
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--
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-- Len is the number of addresses returned 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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-- Skip_Frames says how many of the most recent calls should at least
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-- be excluded from the result, regardless of the exclusion bounds and
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-- starting with this procedure itself: 1 means exclude the frame for
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-- this procedure, 2 means 1 + exclude the frame for this procedure's
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-- caller, ...
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--
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-- On return, the Traceback array is filled in, and Len indicates the
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-- number of stored entries. The first entry is the most recent call,
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-- 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) 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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