------------------------------------------------------------------------------ -- -- -- 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;