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-- Values in 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, write to the Free Software
-- Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
-- MA 02110-1301, USA.
with Types; use Types;
with Netlists; use Netlists;
with Synth.Environment; use Synth.Environment;
with Simul.Environments; use Simul.Environments;
with Iirs; use Iirs;
package Synth.Values is
-- Values is how signals and variables are decomposed. This is similar to
-- values in simulation, but simplified (no need to handle files,
-- accesses...)
type Value_Kind is (Value_Net, Value_Wire, Value_Array, Value_Record,
Value_Lit);
type Value_Type (Kind : Value_Kind);
type Value_Acc is access Value_Type;
type Value_Type_Array is array (Iir_Index32 range <>) of Value_Acc;
type Value_Array_Type (Len : Iir_Index32) is record
V : Value_Type_Array (1 .. Len);
end record;
type Value_Array_Acc is access Value_Array_Type;
type Value_Range is record
Dir : Iir_Direction;
Len : Width;
Left : Int32;
Right : Int32;
end record;
type Value_Range_Acc is access Value_Range;
No_Range : constant Value_Range_Acc := null;
type Value_Type (Kind : Value_Kind) is record
case Kind is
when Value_Net =>
N : Net;
N_Range : Value_Range_Acc;
when Value_Wire =>
W : Wire_Id;
W_Range : Value_Range_Acc;
when Value_Lit =>
Lit : Simul.Environments.Iir_Value_Literal_Acc;
Lit_Type : Iir;
when Value_Array =>
Arr : Value_Array_Acc;
Bounds : Value_Bounds_Array_Acc;
when Value_Record =>
Rec : Value_Array_Acc;
end case;
end record;
-- Create a Value_Net.
function Create_Value_Net (N : Net; Rng : Value_Range_Acc) return Value_Acc;
-- Create a Value_Wire. For a bit wire, RNG must be null.
function Create_Value_Wire (W : Wire_Id; Rng : Value_Range_Acc)
return Value_Acc;
-- Create a Value_Lit.
function Create_Value_Lit (Val : Iir_Value_Literal_Acc; Typ : Iir)
return Value_Acc;
-- Create a Value_Array.
function Create_Array_Value (Bounds : Value_Bounds_Array_Acc)
return Value_Acc;
-- Allocate the ARR component of the Value_Type ARR, using BOUNDS.
procedure Create_Array_Data (Arr : Value_Acc);
-- Allocate a Value_Range.
function Create_Range_Value (Rng : Value_Range) return Value_Range_Acc;
-- Create a Value_Range from a simulation bound.
function Bounds_To_Range (Val : Iir_Value_Literal_Acc)
return Value_Range_Acc;
-- Values are stored into Synth_Instance, which is parallel to simulation
-- Block_Instance_Type.
type Objects_Array is array (Object_Slot_Type range <>) of Value_Acc;
type Synth_Instance_Type (Max_Objs : Object_Slot_Type) is record
-- Module which owns gates created for this instance.
M : Module;
-- Name prefix for declarations.
Name : Sname;
Sim : Block_Instance_Acc;
Objects : Objects_Array (1 .. Max_Objs);
end record;
type Synth_Instance_Acc is access Synth_Instance_Type;
end Synth.Values;
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