gcc/ada/s-traceb-mastop.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 --                     Copyright (C) 1999-2005, AdaCore                     --
  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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This version uses System.Machine_State_Operations routines
  35
  36 with System.Machine_State_Operations;
  37
  38 package body System.Traceback is
  39
  40    use System.Machine_State_Operations;
  41
  42    ----------------
  43    -- Call_Chain --
  44    ----------------
  45
  46    procedure Call_Chain
  47      (Traceback : System.Address;
  48       Max_Len   : Natural;
  49       Len       : out Natural;
  50       Exclude_Min : System.Address := System.Null_Address;
  51       Exclude_Max : System.Address := System.Null_Address;
  52       Skip_Frames : Natural := 1)
  53    is
  54       type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
  55       pragma Suppress_Initialization (Tracebacks_Array);
  56
  57       M     : Machine_State;
  58       Code  : Code_Loc;
  59
  60       Trace : Tracebacks_Array;
  61       for Trace'Address use Traceback;
  62
  63       N_Skips  : Natural := 0;
  64
  65    begin
  66       M := Allocate_Machine_State;
  67       Set_Machine_State (M);
  68
  69       --  Skip the requested number of frames
  70
  71       loop
  72          Code := Get_Code_Loc (M);
  73          exit when Code = Null_Address or else N_Skips = Skip_Frames;
  74
  75          Pop_Frame (M);
  76          N_Skips := N_Skips + 1;
  77       end loop;
  78
  79       --  Now, record the frames outside the exclusion bounds, updating
  80       --  the Len output value along the way.
  81
  82       Len := 0;
  83       loop
  84          Code := Get_Code_Loc (M);
  85          exit when Code = Null_Address or else Len = Max_Len;
  86
  87          if Code < Exclude_Min or else Code > Exclude_Max then
  88             Len := Len + 1;
  89             Trace (Len) := Code;
  90          end if;
  91
  92          Pop_Frame (M);
  93       end loop;
  94
  95       Free_Machine_State (M);
  96    end Call_Chain;
  97
  98    ------------------
  99    -- C_Call_Chain --
 100    ------------------
 101
 102    function C_Call_Chain
 103      (Traceback : System.Address;
 104       Max_Len   : Natural) return Natural
 105    is
 106       Val : Natural;
 107    begin
 108       Call_Chain (Traceback, Max_Len, Val);
 109       return Val;
 110    end C_Call_Chain;
 111
 112 end System.Traceback;