1------------------------------------------------------------------------------ 2-- -- 3-- GNAT COMPILER COMPONENTS -- 4-- -- 5-- S Y S T E M . T R A C E B A C K -- 6-- -- 7-- B o d y -- 8-- -- 9-- Copyright (C) 1999-2009, Free Software Foundation, Inc. -- 10-- -- 11-- GNAT is free software; you can redistribute it and/or modify it under -- 12-- terms of the GNU General Public License as published by the Free Soft- -- 13-- ware Foundation; either version 3, or (at your option) any later ver- -- 14-- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- 15-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- 16-- or FITNESS FOR A PARTICULAR PURPOSE. -- 17-- -- 18-- As a special exception under Section 7 of GPL version 3, you are granted -- 19-- additional permissions described in the GCC Runtime Library Exception, -- 20-- version 3.1, as published by the Free Software Foundation. -- 21-- -- 22-- You should have received a copy of the GNU General Public License and -- 23-- a copy of the GCC Runtime Library Exception along with this program; -- 24-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- 25-- <http://www.gnu.org/licenses/>. -- 26-- -- 27-- GNAT was originally developed by the GNAT team at New York University. -- 28-- Extensive contributions were provided by Ada Core Technologies Inc. -- 29-- -- 30------------------------------------------------------------------------------ 31 32-- This is the default version of this package 33 34-- Note: this unit must be compiled using -fno-optimize-sibling-calls. 35-- See comment below in body of Call_Chain for details on the reason. 36 37pragma Compiler_Unit; 38 39package body System.Traceback is 40 41 ------------------ 42 -- C_Call_Chain -- 43 ------------------ 44 45 function C_Call_Chain 46 (Traceback : System.Address; 47 Max_Len : Natural) 48 return Natural 49 is 50 Val : Natural; 51 52 begin 53 Call_Chain (Traceback, Max_Len, Val); 54 return Val; 55 end C_Call_Chain; 56 57 ---------------- 58 -- Call_Chain -- 59 ---------------- 60 61 function Backtrace 62 (Traceback : System.Address; 63 Len : Integer; 64 Exclude_Min : System.Address; 65 Exclude_Max : System.Address; 66 Skip_Frames : Integer) 67 return Integer; 68 pragma Import (C, Backtrace, "__gnat_backtrace"); 69 70 procedure Call_Chain 71 (Traceback : System.Address; 72 Max_Len : Natural; 73 Len : out Natural; 74 Exclude_Min : System.Address := System.Null_Address; 75 Exclude_Max : System.Address := System.Null_Address; 76 Skip_Frames : Natural := 1) 77 is 78 begin 79 -- Note: Backtrace relies on the following call actually creating a 80 -- stack frame. To ensure that this is the case, it is essential to 81 -- compile this unit without sibling call optimization. 82 83 -- We want the underlying engine to skip its own frame plus the 84 -- ones we have been requested to skip ourselves. 85 86 Len := Backtrace (Traceback => Traceback, 87 Len => Max_Len, 88 Exclude_Min => Exclude_Min, 89 Exclude_Max => Exclude_Max, 90 Skip_Frames => Skip_Frames + 1); 91 end Call_Chain; 92 93end System.Traceback; 94