gcc/ada/7straceb.adb

   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 --                            $Revision: 1.2 $
  10 --                                                                          --
  11 --           Copyright (C) 1999-2000 Ada Core Technologies, Inc.            --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 --  This version assumes that System.Machine_State_Operations.Pop_Frame can
  37 --  work with the Info parameter being null.
  38
  39 with System.Machine_State_Operations;
  40
  41 package body System.Traceback is
  42
  43    use System.Machine_State_Operations;
  44
  45    ----------------
  46    -- Call_Chain --
  47    ----------------
  48
  49    procedure Call_Chain
  50      (Traceback : System.Address;
  51       Max_Len   : Natural;
  52       Len       : out Natural;
  53       Exclude_Min,
  54       Exclude_Max : System.Address := System.Null_Address)
  55    is
  56       type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
  57       pragma Suppress_Initialization (Tracebacks_Array);
  58
  59       M     : Machine_State;
  60       Code  : Code_Loc;
  61       J     : Natural := 1;
  62       Trace : Tracebacks_Array;
  63       for Trace'Address use Traceback;
  64
  65    begin
  66       M := Allocate_Machine_State;
  67       Set_Machine_State (M);
  68
  69       loop
  70          Code := Get_Code_Loc (M);
  71
  72          exit when Code = Null_Address or else J = Max_Len + 1;
  73
  74          if Code < Exclude_Min or else Code > Exclude_Max then
  75             Trace (J) := Code;
  76             J := J + 1;
  77          end if;
  78
  79          Pop_Frame (M, System.Null_Address);
  80       end loop;
  81
  82       Len := J - 1;
  83       Free_Machine_State (M);
  84    end Call_Chain;
  85
  86    ------------------
  87    -- C_Call_Chain --
  88    ------------------
  89
  90    function C_Call_Chain
  91      (Traceback   : System.Address;
  92       Max_Len     : Natural) return Natural
  93    is
  94       Val : Natural;
  95    begin
  96       Call_Chain (Traceback, Max_Len, Val);
  97       return Val;
  98    end C_Call_Chain;
  99
 100 end System.Traceback;