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