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) 1999-2010, 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 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 version uses System.Machine_State_Operations routines
  33
  34 with System.Machine_State_Operations;
  35
  36 package body System.Traceback is
  37
  38    use System.Machine_State_Operations;
  39
  40    ----------------
  41    -- Call_Chain --
  42    ----------------
  43
  44    procedure Call_Chain
  45      (Traceback : System.Address;
  46       Max_Len   : Natural;
  47       Len       : out Natural;
  48       Exclude_Min : System.Address := System.Null_Address;
  49       Exclude_Max : System.Address := System.Null_Address;
  50       Skip_Frames : Natural := 1)
  51    is
  52       type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
  53       pragma Suppress_Initialization (Tracebacks_Array);
  54
  55       M     : Machine_State;
  56       Code  : Code_Loc;
  57
  58       Trace : Tracebacks_Array;
  59       for Trace'Address use Traceback;
  60
  61       N_Skips  : Natural := 0;
  62
  63    begin
  64       M := Allocate_Machine_State;
  65       Set_Machine_State (M);
  66
  67       --  Skip the requested number of frames
  68
  69       loop
  70          Code := Get_Code_Loc (M);
  71          exit when Code = Null_Address or else N_Skips = Skip_Frames;
  72
  73          Pop_Frame (M);
  74          N_Skips := N_Skips + 1;
  75       end loop;
  76
  77       --  Now, record the frames outside the exclusion bounds, updating
  78       --  the Len output value along the way.
  79
  80       Len := 0;
  81       loop
  82          Code := Get_Code_Loc (M);
  83          exit when Code = Null_Address or else Len = Max_Len;
  84
  85          if Code < Exclude_Min or else Code > Exclude_Max then
  86             Len := Len + 1;
  87             Trace (Len) := Code;
  88          end if;
  89
  90          Pop_Frame (M);
  91       end loop;
  92
  93       Free_Machine_State (M);
  94    end Call_Chain;
  95
  96    ------------------
  97    -- C_Call_Chain --
  98    ------------------
  99
 100    function C_Call_Chain
 101      (Traceback : System.Address;
 102       Max_Len   : Natural) return Natural
 103    is
 104       Val : Natural;
 105    begin
 106       Call_Chain (Traceback, Max_Len, Val);
 107       return Val;
 108    end C_Call_Chain;
 109
 110 end System.Traceback;