gcc/ada/libgnat/s-trasym.ads

   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 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                     Copyright (C) 1999-2017, 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 --  Run-time symbolic traceback support
  33
  34 --  The full capability is currently supported on the following targets:
  35
  36 --     GNU/Linux x86, x86_64, ia64
  37
  38 --  Note: on targets other than those listed above, a dummy implementation
  39 --  of the body returns a series of LF separated strings of the form "0x..."
  40 --  corresponding to the addresses.
  41
  42 --  The routines provided in this package assume that your application has been
  43 --  compiled with debugging information turned on, since this information is
  44 --  used to build a symbolic traceback.
  45
  46 --  If you want to retrieve tracebacks from exception occurrences, it is also
  47 --  necessary to invoke the binder with -E switch. Please refer to the gnatbind
  48 --  documentation for more information.
  49
  50 --  Note that it is also possible (and often recommended) to compute symbolic
  51 --  traceback outside the program execution, which in addition allows you to
  52 --  distribute the executable with no debug info:
  53 --
  54 --     - build your executable with debug info
  55 --     - archive this executable
  56 --     - strip a copy of the executable and distribute/deploy this version
  57 --     - at run time, compute absolute traceback (-bargs -E) from your
  58 --       executable and log it using Ada.Exceptions.Exception_Information
  59 --     - off line, compute the symbolic traceback using the executable archived
  60 --       with debug info and addr2line or gdb (using info line *<addr>) on the
  61 --       absolute addresses logged by your application.
  62
  63 --  In order to retrieve symbolic information, functions in this package will
  64 --  read on disk all the debug information of the executable file (found via
  65 --  Argument (0), and looked in the PATH if needed) or shared libraries using
  66 --  OS facilities, and load them in memory, causing a significant cpu and
  67 --  memory overhead.
  68
  69 --  Symbolic traceback from shared libraries is only supported for Windows and
  70 --  Linux. On other targets symbolic tracebacks are only supported for the main
  71 --  executable. You should consider using gdb to obtain symbolic traceback in
  72 --  such cases.
  73
  74 pragma Polling (Off);
  75 --  We must turn polling off for this unit, because otherwise we can get
  76 --  elaboration circularities when polling is turned on.
  77
  78 with Ada.Exceptions;
  79
  80 package System.Traceback.Symbolic is
  81    pragma Elaborate_Body;
  82
  83    function Symbolic_Traceback
  84      (Traceback : System.Traceback_Entries.Tracebacks_Array) return String;
  85    function Symbolic_Traceback_No_Hex
  86      (Traceback : System.Traceback_Entries.Tracebacks_Array) return String;
  87    --  Build a string containing a symbolic traceback of the given call
  88    --  chain. Note: These procedures may be installed by Set_Trace_Decorator,
  89    --  to get a symbolic traceback on all exceptions raised (see
  90    --  System.Exception_Traces).
  91
  92    function Symbolic_Traceback
  93      (E : Ada.Exceptions.Exception_Occurrence) return String;
  94    function Symbolic_Traceback_No_Hex
  95      (E : Ada.Exceptions.Exception_Occurrence) return String;
  96    --  Build string containing symbolic traceback of given exception occurrence
  97
  98    --  In the above, _No_Hex means do not print any hexadecimal addresses, even
  99    --  if the symbol is not available. This is useful for getting deterministic
 100    --  output from tests.
 101
 102    procedure Enable_Cache (Include_Modules : Boolean := False);
 103    --  Read symbolic information from binary files and cache them in memory.
 104    --  This will speed up the above functions but will require more memory. If
 105    --  Include_Modules is true, shared modules (or DLL) will also be cached.
 106    --  This procedure may do nothing if not supported. The profile of this
 107    --  subprogram may change in the future (new parameters can be added
 108    --  with default value), but backward compatibility for direct calls
 109    --  is supported.
 110
 111 end System.Traceback.Symbolic;