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Diffstat (limited to 'gcc/ada/g-debpoo.adb')
| -rw-r--r-- | gcc/ada/g-debpoo.adb | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/gcc/ada/g-debpoo.adb b/gcc/ada/g-debpoo.adb new file mode 100644 index 00000000000..d3d2e7468f8 --- /dev/null +++ b/gcc/ada/g-debpoo.adb @@ -0,0 +1,223 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- G N A T . D E B U G _ P O O L S -- +-- -- +-- B o d y -- +-- -- +-- $Revision: 1.14 $ +-- -- +-- 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. -- +-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). -- +-- -- +------------------------------------------------------------------------------ + +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; |