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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . D E B U G _ P O O L S --
-- --
-- B o d y --
-- --
-- --
-- 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
pragma Warnings (Off, Alignment);
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
pragma Warnings (Off, Alignment);
procedure Free (Address : System.Address; Siz : Storage_Count);
-- Fake free, that resets 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
pragma Warnings (Off, Pool);
pragma Warnings (Off, Size_In_Storage_Elements);
pragma Warnings (Off, Alignment);
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
pragma Warnings (Off, Pool);
begin
return Storage_Count'Last;
end Storage_Size;
end GNAT.Debug_Pools;
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