98 lines
4.8 KiB
Ada
98 lines
4.8 KiB
Ada
------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- G N A T . 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) 1999-2014, AdaCore --
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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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-- Run-time non-symbolic traceback support
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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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-- The traceback information is in the form of absolute code locations.
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-- These code locations may be converted to corresponding source locations
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-- using the external addr2line utility, or from within GDB.
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-- In order to use this facility, in some cases the binder must be invoked
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-- with -E switch (store the backtrace with exception occurrence). Please
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-- refer to gnatbind documentation for more information.
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-- To analyze the code locations later using addr2line or gdb, the necessary
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-- units must be compiled with the debugging switch -g in the usual manner.
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-- Note that it is not necessary to compile with -g to use Call_Chain. In
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-- other words, the following sequence of steps can be used:
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-- Compile without -g
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-- Run the program, and call Call_Chain
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-- Recompile with -g
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-- Use addr2line to interpret the absolute call locations (note that
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-- addr2line expects addresses in hexadecimal format).
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-- This capability is currently supported on the following targets:
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-- AiX PowerPC
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-- HP-UX
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-- GNU/Linux x86
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-- LynxOS x86
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-- Solaris x86
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-- Solaris sparc
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-- VxWorks PowerPC
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-- VxWorks x86
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-- Windows NT/XP
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-- Note: see also GNAT.Traceback.Symbolic, a child unit in file g-trasym.ads
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-- providing symbolic trace back capability for a subset of the above targets.
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with System;
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with Ada.Exceptions.Traceback;
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package GNAT.Traceback is
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pragma Elaborate_Body;
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subtype Code_Loc is System.Address;
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-- Code location used in building tracebacks
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subtype Tracebacks_Array is Ada.Exceptions.Traceback.Tracebacks_Array;
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-- Traceback array used to hold a generated traceback list
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----------------
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-- Call_Chain --
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----------------
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procedure Call_Chain (Traceback : out Tracebacks_Array; Len : out Natural);
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-- Store up to Traceback'Length tracebacks corresponding to the current
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-- call chain. The first entry stored corresponds to the deepest level
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-- of subprogram calls. Len shows the number of traceback entries stored.
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-- It will be equal to Traceback'Length unless the entire traceback is
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-- shorter, in which case positions in Traceback past the Len position
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-- are undefined on return.
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end GNAT.Traceback;
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