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Diffstat (limited to 'gcc/ada/g-dyntab.adb')
| -rw-r--r-- | gcc/ada/g-dyntab.adb | 246 |
1 files changed, 246 insertions, 0 deletions
diff --git a/gcc/ada/g-dyntab.adb b/gcc/ada/g-dyntab.adb new file mode 100644 index 00000000000..02c1bc19636 --- /dev/null +++ b/gcc/ada/g-dyntab.adb @@ -0,0 +1,246 @@ +------------------------------------------------------------------------------ +-- -- +-- 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; |