+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- G N A T . D E B U G _ P O O L S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.1 $
--- --
--- Copyright (C) 1992-2001 Free Software Foundation, Inc. --
--- --
--- GNAT is free software; you can redistribute it and/or modify it under --
--- terms of the GNU General Public License as published by the Free Soft- --
--- ware Foundation; either version 2, or (at your option) any later ver- --
--- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
--- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
--- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
--- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
--- --
--- GNAT was originally developed by the GNAT team at New York University. --
--- Extensive contributions were provided by Ada Core Technologies Inc. --
--- --
-------------------------------------------------------------------------------
-
-with Unchecked_Conversion;
-with GNAT.HTable;
-with System.Memory;
-
-pragma Elaborate_All (GNAT.HTable);
-
-package body GNAT.Debug_Pools is
- use System;
- use System.Memory;
- use System.Storage_Elements;
-
- -- Definition of a H-table storing the status of each storage chunck
- -- used by this pool
-
- type State is (Not_Allocated, Deallocated, Allocated);
-
- type Header is range 1 .. 1023;
- function H (F : Address) return Header;
-
- package Table is new GNAT.HTable.Simple_HTable (
- Header_Num => Header,
- Element => State,
- No_Element => Not_Allocated,
- Key => Address,
- Hash => H,
- Equal => "=");
-
- --------------
- -- Allocate --
- --------------
-
- procedure Allocate
- (Pool : in out Debug_Pool;
- Storage_Address : out Address;
- Size_In_Storage_Elements : Storage_Count;
- Alignment : Storage_Count) is
- begin
- Storage_Address := Alloc (size_t (Size_In_Storage_Elements));
-
- if Storage_Address = Null_Address then
- raise Storage_Error;
- else
- Table.Set (Storage_Address, Allocated);
- Pool.Allocated := Pool.Allocated + Size_In_Storage_Elements;
-
- if Pool.Allocated - Pool.Deallocated > Pool.High_Water then
- Pool.High_Water := Pool.Allocated - Pool.Deallocated;
- end if;
- end if;
- end Allocate;
-
- ----------------
- -- Deallocate --
- ----------------
-
- procedure Deallocate
- (Pool : in out Debug_Pool;
- Storage_Address : Address;
- Size_In_Storage_Elements : Storage_Count;
- Alignment : Storage_Count)
- is
- procedure Free (Address : System.Address; Siz : Storage_Count);
- -- Faked free, that reset all the deallocated storage to "DEADBEEF"
-
- procedure Free (Address : System.Address; Siz : Storage_Count) is
- DB1 : constant Integer := 16#DEAD#;
- DB2 : constant Integer := 16#BEEF#;
-
- type Dead_Memory is array (1 .. Siz / 4) of Integer;
- type Mem_Ptr is access all Dead_Memory;
-
- function From_Ptr is
- new Unchecked_Conversion (System.Address, Mem_Ptr);
-
- J : Storage_Offset;
-
- begin
- J := Dead_Memory'First;
- while J < Dead_Memory'Last loop
- From_Ptr (Address) (J) := DB1;
- From_Ptr (Address) (J + 1) := DB2;
- J := J + 2;
- end loop;
-
- if J = Dead_Memory'Last then
- From_Ptr (Address) (J) := DB1;
- end if;
- end Free;
-
- S : State := Table.Get (Storage_Address);
-
- -- Start of processing for Deallocate
-
- begin
- case S is
- when Not_Allocated =>
- raise Freeing_Not_Allocated_Storage;
-
- when Deallocated =>
- raise Freeing_Deallocated_Storage;
-
- when Allocated =>
- Free (Storage_Address, Size_In_Storage_Elements);
- Table.Set (Storage_Address, Deallocated);
- Pool.Deallocated := Pool.Deallocated + Size_In_Storage_Elements;
- end case;
- end Deallocate;
-
- -----------------
- -- Dereference --
- -----------------
-
- procedure Dereference
- (Pool : in out Debug_Pool;
- Storage_Address : Address;
- Size_In_Storage_Elements : Storage_Count;
- Alignment : Storage_Count)
- is
- S : State := Table.Get (Storage_Address);
- Max_Dim : constant := 3;
- Dim : Integer := 1;
-
- begin
-
- -- If this is not a known address, maybe it is because is is an
- -- unconstained array. In which case, the bounds have used the
- -- 2 first words (per dimension) of the allocated spot.
-
- while S = Not_Allocated and then Dim <= Max_Dim loop
- S := Table.Get (Storage_Address - Storage_Offset (Dim * 2 * 4));
- Dim := Dim + 1;
- end loop;
-
- case S is
- when Not_Allocated =>
- raise Accessing_Not_Allocated_Storage;
-
- when Deallocated =>
- raise Accessing_Deallocated_Storage;
-
- when Allocated =>
- null;
- end case;
- end Dereference;
-
- -------
- -- H --
- -------
-
- function H (F : Address) return Header is
- begin
- return
- Header (1 + (To_Integer (F) mod Integer_Address (Header'Last)));
- end H;
-
- ----------------
- -- Print_Info --
- ----------------
-
- procedure Print_Info (Pool : Debug_Pool) is
- use System.Storage_Elements;
-
- begin
- Put_Line ("Debug Pool info:");
- Put_Line (" Total allocated bytes : "
- & Storage_Offset'Image (Pool.Allocated));
-
- Put_Line (" Total deallocated bytes : "
- & Storage_Offset'Image (Pool.Deallocated));
-
- Put_Line (" Current Water Mark: "
- & Storage_Offset'Image (Pool.Allocated - Pool.Deallocated));
-
- Put_Line (" High Water Mark: "
- & Storage_Offset'Image (Pool.High_Water));
- Put_Line ("");
- end Print_Info;
-
- ------------------
- -- Storage_Size --
- ------------------
-
- function Storage_Size (Pool : Debug_Pool) return Storage_Count is
- begin
- return Storage_Count'Last;
- end Storage_Size;
-
-end GNAT.Debug_Pools;
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