+++ /dev/null
-------------------------------------------------------------------------------
--- --
--- GNAT COMPILER COMPONENTS --
--- --
--- G N A T . D Y N A M I C _ T A B L E S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1 $
--- --
--- 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;
-
-package body GNAT.Dynamic_Tables is
-
- Min : constant Integer := Integer (Table_Low_Bound);
- -- Subscript of the minimum entry in the currently allocated table
-
- type size_t is new Integer;
-
- -----------------------
- -- 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.
-
- --------------
- -- 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
- procedure free (T : Table_Ptr);
- pragma Import (C, free);
-
- begin
- free (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
-
- function realloc
- (memblock : Table_Ptr;
- size : size_t)
- return Table_Ptr;
- pragma Import (C, realloc);
-
- function malloc
- (size : size_t)
- return Table_Ptr;
- pragma Import (C, malloc);
-
- 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 := malloc (New_Size);
-
- elsif New_Size > 0 then
- T.Table :=
- realloc
- (memblock => 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;
-
-end GNAT.Dynamic_Tables;
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