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   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       G N A T . D E B U G _ P O O L S                    --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --                            $Revision: 1.6 $
  10 --                                                                          --
  11 --          Copyright (C) 1992-2001 Free Software Foundation, Inc.          --
  12 --                                                                          --
  13 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  14 -- terms of the  GNU General Public License as published  by the Free Soft- --
  15 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  16 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  17 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  18 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  19 -- for  more details.  You should have  received  a copy of the GNU General --
  20 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  21 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  22 -- MA 02111-1307, USA.                                                      --
  23 --                                                                          --
  24 -- As a special exception,  if other files  instantiate  generics from this --
  25 -- unit, or you link  this unit with other files  to produce an executable, --
  26 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  27 -- covered  by the  GNU  General  Public  License.  This exception does not --
  28 -- however invalidate  any other reasons why  the executable file  might be --
  29 -- covered by the  GNU Public License.                                      --
  30 --                                                                          --
  31 -- GNAT was originally developed  by the GNAT team at  New York University. --
  32 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  33 --                                                                          --
  34 ------------------------------------------------------------------------------
  35
  36 with System;                  use System;
  37 with System.Storage_Elements; use System.Storage_Elements;
  38 with System.Checked_Pools;
  39
  40 package GNAT.Debug_Pools is
  41
  42    --  The debug pool is used to track down memory corruption due to use of
  43    --  deallocated memory or incorrect unchecked conversions. Allocation
  44    --  strategy :
  45
  46    --     - allocation:   . memory is normally allocated with malloc
  47    --                     . the allocated address is noted in a table
  48
  49    --     - deallocation: . memory is  filled with "DEAD_BEEF" patterns
  50    --                     . memory is not freed
  51    --                     . exceptions are raised if the memory was not
  52    --                       allocated or was already deallocated
  53
  54    --     - dereference:  . exceptions are raised if the memory was not
  55    --                        allocated or was already deallocated
  56
  57    Accessing_Not_Allocated_Storage : exception;
  58    Accessing_Deallocated_Storage   : exception;
  59    Freeing_Not_Allocated_Storage   : exception;
  60    Freeing_Deallocated_Storage     : exception;
  61
  62    type Debug_Pool is
  63      new System.Checked_Pools.Checked_Pool with private;
  64
  65    procedure Allocate
  66      (Pool                     : in out Debug_Pool;
  67       Storage_Address          : out Address;
  68       Size_In_Storage_Elements : Storage_Count;
  69       Alignment                : Storage_Count);
  70
  71    procedure Deallocate
  72      (Pool                     : in out Debug_Pool;
  73       Storage_Address          : Address;
  74       Size_In_Storage_Elements : Storage_Count;
  75       Alignment                : Storage_Count);
  76
  77    function Storage_Size
  78      (Pool : Debug_Pool)
  79       return System.Storage_Elements.Storage_Count;
  80
  81    procedure Dereference
  82      (Pool                     : in out Debug_Pool;
  83       Storage_Address          : System.Address;
  84       Size_In_Storage_Elements : Storage_Count;
  85       Alignment                : Storage_Count);
  86
  87    generic
  88       with procedure Put_Line (S : String);
  89    procedure Print_Info (Pool : Debug_Pool);
  90    --  Print out information about the High Water Mark, the current and
  91    --  total number of bytes allocated and the total number of bytes
  92    --  deallocated.
  93
  94 private
  95    type Debug_Pool is new System.Checked_Pools.Checked_Pool with record
  96       Allocated   : Storage_Count := 0;
  97       --  Total number of bytes allocated in this pool
  98
  99       Deallocated : Storage_Count := 0;
 100       --  Total number of bytes deallocated in this pool
 101
 102       High_Water  : Storage_Count := 0;
 103       --  Maximum of during the time of Allocated - Deallocated
 104    end record;
 105 end GNAT.Debug_Pools;