gcc/ada/memroot.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              M E M R O O T                               --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --            Copyright (C) 1997-2001 Ada Core Technologies, Inc.           --
  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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 --  This package offers basic types that deal with gdb backtraces related
  28 --  to memory allocation. A memory root (root_id) is a backtrace
  29 --  referencing the actual point of allocation along with counters
  30 --  recording various information concerning allocation at this root.
  31
  32 --  A back trace is composed of Frames (Frame_Id) which themselves are
  33 --  nothing else than a subprogram call at a source location which can be
  34 --  represented by three strings: subprogram name, file name and line
  35 --  number. All the needed strings are entered in a table and referenced
  36 --  through a Name_Id in order to avoid duplication.
  37
  38 with System.Storage_Elements; use System.Storage_Elements;
  39 with Ada.Text_IO;             use Ada.Text_IO;
  40
  41 package Memroot is
  42
  43    --  Work with instrumented allocation routines
  44    Gmem_Mode  : Boolean := False;
  45
  46    --  Simple abstract type for names. A name is a sequence of letters.
  47
  48    type Name_Id is new Natural;
  49    No_Name_Id : constant Name_Id := 0;
  50
  51    function Enter_Name (S : String) return Name_Id;
  52    function Image      (N : Name_Id) return String;
  53
  54    --  Simple abstract type for a backtrace frame. A frame is composed by
  55    --  a subprogram name, a file name and a line reference.
  56
  57    type Frame_Id is new Natural;
  58    No_Frame_Id : constant Frame_Id := 0;
  59
  60    function Enter_Frame (Name, File, Line : Name_Id) return Frame_Id;
  61
  62    type Frame_Array is array (Natural range <>) of Frame_Id;
  63
  64    --  Simple abstract type for an allocation root. It is composed by a set
  65    --  of frames, the number of allocation, the total size of allocated
  66    --  memory, and the high water mark.  An iterator is also provided to
  67    --  iterate over all the entered allocation roots.
  68
  69    type Root_Id is new Natural;
  70    No_Root_Id : constant Root_Id := 0;
  71
  72    function Read_BT (BT_Depth : Integer; FT : File_Type) return Root_Id;
  73    --  Read a backtrace from file FT whose maximum frame number is given by
  74    --  BT_Depth and returns the corresponding Allocation root.
  75
  76    function Enter_Root  (Fr : Frame_Array) return Root_Id;
  77    --  Create an allocation root from the frames that compose it
  78
  79    function Frames_Of   (B  : Root_Id) return Frame_Array;
  80    --  Retreives the Frames of the root's backtrace
  81
  82    procedure Print_BT (B  : Root_Id);
  83    --  Prints on standard out the backtrace associated with the root B
  84
  85    function Get_First return Root_Id;
  86    function Get_Next  return Root_Id;
  87    --  Iterator to iterate over roots
  88
  89    procedure Set_Nb_Alloc (B : Root_Id; V : Integer);
  90    function      Nb_Alloc (B : Root_Id) return Integer;
  91    --  Access and modify the number of allocation counter associated with
  92    --  this allocation root. If the value is negative, it means that this is
  93    --  not an allocation root but a deallocation root (this can only happen
  94    --  in erroneous situations where there are more frees than allocations).
  95
  96    procedure Set_Alloc_Size (B : Root_Id; V : Storage_Count);
  97    function      Alloc_Size (B : Root_Id) return Storage_Count;
  98    --  Access and modify the total allocated memory counter associated with
  99    --  this allocation root.
 100
 101    procedure Set_High_Water_Mark (B : Root_Id; V : Storage_Count);
 102    function  High_Water_Mark     (B : Root_Id) return Storage_Count;
 103    --  Access and modify the high water mark associated with this
 104    --  allocation root. The high water mark is the maximum value, over
 105    --  time, of the Alloc_Size.
 106
 107 end Memroot;