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) 1999-2014, 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 --   procedure Call_Chain
  41 --     (Traceback   : System.Address;
  42 --      Max_Len     : Natural;
  43 --      Len         : out Natural;
  44 --      Exclude_Min : System.Address := System.Null_Address;
  45 --      Exclude_Max : System.Address := System.Null_Address;
  46 --      Skip_Frames : Natural := 1);
  47 --   --  Same as the exported version, but takes Traceback as an Address
  48 --  ???See declaration in the spec for why this is temporarily commented out.
  49
  50    ----------------
  51    -- Call_Chain --
  52    ----------------
  53
  54    procedure Call_Chain
  55      (Traceback : System.Address;
  56       Max_Len   : Natural;
  57       Len       : out Natural;
  58       Exclude_Min : System.Address := System.Null_Address;
  59       Exclude_Max : System.Address := System.Null_Address;
  60       Skip_Frames : Natural := 1)
  61    is
  62       type Tracebacks_Array is array (1 .. Max_Len) of Code_Loc;
  63       pragma Suppress_Initialization (Tracebacks_Array);
  64
  65       M     : Machine_State;
  66       Code  : Code_Loc;
  67
  68       Trace : Tracebacks_Array;
  69       for Trace'Address use Traceback;
  70
  71       N_Skips  : Natural := 0;
  72
  73    begin
  74       M := Allocate_Machine_State;
  75       Set_Machine_State (M);
  76
  77       --  Skip the requested number of frames
  78
  79       loop
  80          Code := Get_Code_Loc (M);
  81          exit when Code = Null_Address or else N_Skips = Skip_Frames;
  82
  83          Pop_Frame (M);
  84          N_Skips := N_Skips + 1;
  85       end loop;
  86
  87       --  Now, record the frames outside the exclusion bounds, updating
  88       --  the Len output value along the way.
  89
  90       Len := 0;
  91       loop
  92          Code := Get_Code_Loc (M);
  93          exit when Code = Null_Address or else Len = Max_Len;
  94
  95          if Code < Exclude_Min or else Code > Exclude_Max then
  96             Len := Len + 1;
  97             Trace (Len) := Code;
  98          end if;
  99
 100          Pop_Frame (M);
 101       end loop;
 102
 103       Free_Machine_State (M);
 104    end Call_Chain;
 105
 106    procedure Call_Chain
 107      (Traceback   : in out System.Traceback_Entries.Tracebacks_Array;
 108       Max_Len     : Natural;
 109       Len         : out Natural;
 110       Exclude_Min : System.Address := System.Null_Address;
 111       Exclude_Max : System.Address := System.Null_Address;
 112       Skip_Frames : Natural := 1)
 113    is
 114    begin
 115       Call_Chain
 116         (Traceback'Address, Max_Len, Len,
 117          Exclude_Min, Exclude_Max,
 118
 119          --  Skip one extra frame to skip the other Call_Chain entry as well
 120
 121          Skip_Frames => Skip_Frames + 1);
 122    end Call_Chain;
 123
 124    ------------------
 125    -- C_Call_Chain --
 126    ------------------
 127
 128    function C_Call_Chain
 129      (Traceback : System.Address;
 130       Max_Len   : Natural) return Natural
 131    is
 132       Val : Natural;
 133    begin
 134       Call_Chain (Traceback, Max_Len, Val);
 135       return Val;
 136    end C_Call_Chain;
 137
 138 end System.Traceback;