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-- Heap for synthesis.
-- Copyright (C) 2017 Tristan Gingold
--
-- This file is part of GHDL.
--
-- This program is free software: you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation, either version 2 of the License, or
-- (at your option) any later version.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT 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
-- along with this program. If not, see <gnu.org/licenses>.
with Types; use Types;
with Tables;
with Elab.Memtype; use Elab.Memtype;
package body Elab.Vhdl_Heap is
package Heap_Table is new Tables
(Table_Component_Type => Valtyp,
Table_Index_Type => Heap_Index,
Table_Low_Bound => 1,
Table_Initial => 16);
function Alloc_Mem (Sz : Size_Type) return Memory_Ptr;
pragma Import (C, Alloc_Mem, "malloc");
function Allocate_Memory (T : Type_Acc) return Value_Acc
is
M : Memory_Ptr;
begin
M := Alloc_Mem (T.Sz);
return new Value_Type'(Kind => Value_Memory, Mem => M);
end Allocate_Memory;
function Allocate_By_Type (T : Type_Acc) return Value_Acc
is
Res : Value_Acc;
begin
Res := Allocate_Memory (T);
Write_Value_Default (Res.Mem, T);
return Res;
end Allocate_By_Type;
function Allocate_By_Type (T : Type_Acc) return Heap_Index is
begin
-- FIXME: allocate type.
Heap_Table.Append ((T, Allocate_By_Type (T)));
return Heap_Table.Last;
end Allocate_By_Type;
function Allocate_By_Value (V : Valtyp) return Value_Acc
is
Res : Value_Acc;
begin
Res := Allocate_Memory (V.Typ);
Write_Value (Res.Mem, V);
return Res;
end Allocate_By_Value;
function Allocate_By_Value (V : Valtyp) return Heap_Index is
begin
Heap_Table.Append ((V.Typ, Allocate_By_Value (V)));
return Heap_Table.Last;
end Allocate_By_Value;
function Synth_Dereference (Idx : Heap_Index) return Valtyp is
begin
return Heap_Table.Table (Idx);
end Synth_Dereference;
procedure Free (Obj : in out Valtyp) is
begin
-- TODO
Obj := No_Valtyp;
end Free;
procedure Synth_Deallocate (Idx : Heap_Index) is
begin
if Heap_Table.Table (Idx) = No_Valtyp then
return;
end if;
Free (Heap_Table.Table (Idx));
end Synth_Deallocate;
end Elab.Vhdl_Heap;
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