| ------------------------------------------------------------------------------ |
| -- -- |
| -- 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: 1.4 $ |
| -- -- |
| -- 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; |
