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------------------------------------------------------------------------------
-- --
-- GNAT RUN-TIME COMPONENTS --
-- --
-- G N A T . T R A C E B A C K --
-- --
-- S p e c --
-- --
-- Copyright (C) 1999-2023, AdaCore --
-- --
-- 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. --
-- --
------------------------------------------------------------------------------
-- Run-time non-symbolic traceback support
-- 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.
-- The traceback information is in the form of absolute code locations.
-- These code locations may be converted to corresponding source locations
-- using the addr2line or gnatsymbolize utilities, or from within GDB.
-- In order to use this facility, in some cases the binder must be invoked
-- with -E switch (store the backtrace with exception occurrence). Please
-- refer to gnatbind documentation for more information.
-- To analyze the code locations later using addr2line, gnatsymbolize or GDB,
-- the necessary units must be compiled with the debugging switch -g in the
-- usual manner. Note that it is not necessary to compile with -g to use
-- Call_Chain. In other words, the following sequence of steps can be used:
-- Compile without -g
-- Run the program, and call Call_Chain
-- Recompile with -g
-- Use addr2line or gnatsymbolize to interpret the absolute call locations
-- (note that addr2line expects addresses in hexadecimal format).
-- This capability is currently supported on the following targets:
-- AIX PowerPC
-- GNU/Linux x86
-- GNU/Linux PowerPC
-- LynxOS x86
-- LynxOS-178 PowerPC
-- Solaris x86
-- Solaris SPARC
-- VxWorks ARM
-- VxWorks PowerPC
-- VxWorks x86
-- Windows
-- Note: see also GNAT.Traceback.Symbolic, a child unit in file g-trasym.ads
-- providing symbolic trace back capability for a subset of the above targets.
with System;
with Ada.Exceptions.Traceback;
package GNAT.Traceback is
pragma Elaborate_Body;
subtype Code_Loc is System.Address;
-- Code location used in building tracebacks
subtype Tracebacks_Array is Ada.Exceptions.Traceback.Tracebacks_Array;
-- Traceback array used to hold a generated traceback list
----------------
-- Call_Chain --
----------------
procedure Call_Chain (Traceback : out Tracebacks_Array; Len : out Natural);
-- Store up to Traceback'Length tracebacks corresponding to the current
-- call chain. The first entry stored corresponds to the deepest level
-- of subprogram calls. Len shows the number of traceback entries stored.
-- It will be equal to Traceback'Length unless the entire traceback is
-- shorter, in which case positions in Traceback past the Len position
-- are undefined on return.
function Call_Chain
(Max_Len : Positive;
Skip_Frames : Natural := 1) return Tracebacks_Array;
-- Return up to Max_Len tracebacks corresponding to the current call
-- chain. Result array order is the same as in above procedure Call_Chain
-- except that Skip_Frames says how many of the most recent calls should be
-- excluded from the result, starting with this procedure itself: 1 means
-- exclude the frame for this procedure, 2 means 1 + exclude the frame for
-- this procedure's caller, ...
function Executable_Load_Address return System.Address;
pragma Import (C,
Executable_Load_Address,
"__gnat_get_executable_load_address");
-- Return the load address of the executable or System.Null_Address if the
-- executable has been loaded at the address computed by the static linker.
-- This address is needed to interpret the absolute call locations given by
-- the subprograms of this unit when Position-Independent Executables (PIE)
-- are used on recent GNU/Linux and Windows versions.
end GNAT.Traceback;
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