gcc/ada/libgnat/s-trasym.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME COMPONENTS                         --
   4 --                                                                          --
   5 --           S Y S T E M . T R A C E B A C K . S Y M B O L I C              --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 1999-2018, 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 is the default implementation for platforms where the full capability
  33 --  is not supported. It returns tracebacks as lists of hexadecimal addresses
  34 --  of the form "0x...".
  35
  36 pragma Polling (Off);
  37 --  We must turn polling off for this unit, because otherwise we can get
  38 --  elaboration circularities when polling is turned on.
  39
  40 with Ada.Exceptions.Traceback; use Ada.Exceptions.Traceback;
  41 with System.Address_Image;
  42
  43 package body System.Traceback.Symbolic is
  44
  45    --  Note that Suppress_Hex is ignored in this version of this package.
  46
  47    ------------------------
  48    -- Symbolic_Traceback --
  49    ------------------------
  50
  51    function Symbolic_Traceback
  52      (Traceback : System.Traceback_Entries.Tracebacks_Array) return String
  53    is
  54    begin
  55       if Traceback'Length = 0 then
  56          return "";
  57
  58       else
  59          declare
  60             Img : String := System.Address_Image (Traceback (Traceback'First));
  61
  62             Result : String (1 .. (Img'Length + 3) * Traceback'Length);
  63             Last   : Natural := 0;
  64
  65          begin
  66             for J in Traceback'Range loop
  67                Img := System.Address_Image (Traceback (J));
  68                Result (Last + 1 .. Last + 2)          := "0x";
  69                Last                                   := Last + 2;
  70                Result (Last + 1 .. Last + Img'Length) := Img;
  71                Last                                   := Last + Img'Length + 1;
  72                Result (Last)                          := ' ';
  73             end loop;
  74
  75             Result (Last) := ASCII.LF;
  76             return Result (1 .. Last);
  77          end;
  78       end if;
  79    end Symbolic_Traceback;
  80
  81    --  "No_Hex" is ignored in this version, because otherwise we have nothing
  82    --  at all to print.
  83
  84    function Symbolic_Traceback_No_Hex
  85      (Traceback : System.Traceback_Entries.Tracebacks_Array) return String is
  86    begin
  87       return Symbolic_Traceback (Traceback);
  88    end Symbolic_Traceback_No_Hex;
  89
  90    function Symbolic_Traceback
  91      (E : Ada.Exceptions.Exception_Occurrence) return String
  92    is
  93    begin
  94       return Symbolic_Traceback (Ada.Exceptions.Traceback.Tracebacks (E));
  95    end Symbolic_Traceback;
  96
  97    function Symbolic_Traceback_No_Hex
  98      (E : Ada.Exceptions.Exception_Occurrence) return String is
  99    begin
 100       return Symbolic_Traceback (E);
 101    end Symbolic_Traceback_No_Hex;
 102
 103    ------------------
 104    -- Enable_Cache --
 105    ------------------
 106
 107    procedure Enable_Cache (Include_Modules : Boolean := False) is
 108    begin
 109       null;
 110    end Enable_Cache;
 111
 112 end System.Traceback.Symbolic;