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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- G N A T . D Y N A M I C _ T A B L E S --
-- --
-- B o d y --
-- --
-- --
-- Copyright (C) 2000-2001 Ada Core Technologies, 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 is maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with System; use System;
with System.Memory; use System.Memory;
with System.Address_To_Access_Conversions;
package body GNAT.Dynamic_Tables is
Min : constant Integer := Integer (Table_Low_Bound);
-- Subscript of the minimum entry in the currently allocated table
-----------------------
-- Local Subprograms --
-----------------------
procedure Reallocate (T : in out Instance);
-- Reallocate the existing table according to the current value stored
-- in Max. Works correctly to do an initial allocation if the table
-- is currently null.
package Table_Conversions is
new System.Address_To_Access_Conversions (Big_Table_Type);
-- Address and Access conversions for a Table object.
function To_Address (Table : Table_Ptr) return Address;
pragma Inline (To_Address);
-- Returns the Address for the Table object.
function To_Pointer (Table : Address) return Table_Ptr;
pragma Inline (To_Pointer);
-- Returns the Access pointer for the Table object.
--------------
-- Allocate --
--------------
procedure Allocate
(T : in out Instance;
Num : Integer := 1)
is
begin
T.P.Last_Val := T.P.Last_Val + Num;
if T.P.Last_Val > T.P.Max then
Reallocate (T);
end if;
end Allocate;
------------
-- Append --
------------
procedure Append (T : in out Instance; New_Val : Table_Component_Type) is
begin
Increment_Last (T);
T.Table (Table_Index_Type (T.P.Last_Val)) := New_Val;
end Append;
--------------------
-- Decrement_Last --
--------------------
procedure Decrement_Last (T : in out Instance) is
begin
T.P.Last_Val := T.P.Last_Val - 1;
end Decrement_Last;
----------
-- Free --
----------
procedure Free (T : in out Instance) is
begin
Free (To_Address (T.Table));
T.Table := null;
T.P.Length := 0;
end Free;
--------------------
-- Increment_Last --
--------------------
procedure Increment_Last (T : in out Instance) is
begin
T.P.Last_Val := T.P.Last_Val + 1;
if T.P.Last_Val > T.P.Max then
Reallocate (T);
end if;
end Increment_Last;
----------
-- Init --
----------
procedure Init (T : in out Instance) is
Old_Length : constant Integer := T.P.Length;
begin
T.P.Last_Val := Min - 1;
T.P.Max := Min + Table_Initial - 1;
T.P.Length := T.P.Max - Min + 1;
-- If table is same size as before (happens when table is never
-- expanded which is a common case), then simply reuse it. Note
-- that this also means that an explicit Init call right after
-- the implicit one in the package body is harmless.
if Old_Length = T.P.Length then
return;
-- Otherwise we can use Reallocate to get a table of the right size.
-- Note that Reallocate works fine to allocate a table of the right
-- initial size when it is first allocated.
else
Reallocate (T);
end if;
end Init;
----------
-- Last --
----------
function Last (T : in Instance) return Table_Index_Type is
begin
return Table_Index_Type (T.P.Last_Val);
end Last;
----------------
-- Reallocate --
----------------
procedure Reallocate (T : in out Instance) is
New_Size : size_t;
begin
if T.P.Max < T.P.Last_Val then
while T.P.Max < T.P.Last_Val loop
T.P.Length := T.P.Length * (100 + Table_Increment) / 100;
T.P.Max := Min + T.P.Length - 1;
end loop;
end if;
New_Size :=
size_t ((T.P.Max - Min + 1) *
(Table_Type'Component_Size / Storage_Unit));
if T.Table = null then
T.Table := To_Pointer (Alloc (New_Size));
elsif New_Size > 0 then
T.Table :=
To_Pointer (Realloc (Ptr => To_Address (T.Table),
Size => New_Size));
end if;
if T.P.Length /= 0 and then T.Table = null then
raise Storage_Error;
end if;
end Reallocate;
-------------
-- Release --
-------------
procedure Release (T : in out Instance) is
begin
T.P.Length := T.P.Last_Val - Integer (Table_Low_Bound) + 1;
T.P.Max := T.P.Last_Val;
Reallocate (T);
end Release;
--------------
-- Set_Item --
--------------
procedure Set_Item
(T : in out Instance;
Index : Table_Index_Type;
Item : Table_Component_Type)
is
begin
if Integer (Index) > T.P.Max then
Set_Last (T, Index);
end if;
T.Table (Index) := Item;
end Set_Item;
--------------
-- Set_Last --
--------------
procedure Set_Last (T : in out Instance; New_Val : Table_Index_Type) is
begin
if Integer (New_Val) < T.P.Last_Val then
T.P.Last_Val := Integer (New_Val);
else
T.P.Last_Val := Integer (New_Val);
if T.P.Last_Val > T.P.Max then
Reallocate (T);
end if;
end if;
end Set_Last;
----------------
-- To_Address --
----------------
function To_Address (Table : Table_Ptr) return Address is
begin
return Table_Conversions.To_Address
(Table_Conversions.Object_Pointer (Table));
end To_Address;
----------------
-- To_Pointer --
----------------
function To_Pointer (Table : Address) return Table_Ptr is
begin
return Table_Ptr (Table_Conversions.To_Pointer (Table));
end To_Pointer;
end GNAT.Dynamic_Tables;
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