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