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|
-- Netlist utilities (composed of a few calls).
-- 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 Mutils;
with Types_Utils; use Types_Utils;
with Netlists.Gates; use Netlists.Gates;
package body Netlists.Utils is
function Get_Nbr_Inputs (Inst : Instance) return Port_Nbr
is
M : constant Module := Get_Module (Inst);
begin
case Get_Id (M) is
when Id_Concatn =>
return Port_Nbr (Get_Param_Uns32 (Inst, 0));
when others =>
if Is_Self_Instance (Inst) then
return Get_Nbr_Outputs (M);
else
return Get_Nbr_Inputs (M);
end if;
end case;
end Get_Nbr_Inputs;
function Get_Nbr_Outputs (Inst : Instance) return Port_Nbr
is
M : constant Module := Get_Module (Inst);
begin
if Is_Self_Instance (Inst) then
return Get_Nbr_Inputs (M);
else
return Get_Nbr_Outputs (M);
end if;
end Get_Nbr_Outputs;
function Get_Nbr_Params (Inst : Instance) return Param_Nbr
is
M : constant Module := Get_Module (Inst);
begin
case Get_Id (M) is
when Id_Const_Bit =>
return Param_Nbr ((Get_Width (Get_Output (Inst, 0)) + 31) / 32);
when Id_Const_Log =>
return Param_Nbr
(2 * ((Get_Width (Get_Output (Inst, 0)) + 31) / 32));
when others =>
return Get_Nbr_Params (M);
end case;
end Get_Nbr_Params;
function Get_Param_Desc
(Inst : Instance; Param : Param_Idx) return Param_Desc is
begin
return Get_Param_Desc (Get_Module (Inst), Param);
end Get_Param_Desc;
function Get_Id (Inst : Instance) return Module_Id is
begin
return Get_Id (Get_Module (Inst));
end Get_Id;
function Get_Input_Name (M : Module; I : Port_Idx) return Sname is
begin
return Get_Input_Desc (M, I).Name;
end Get_Input_Name;
function Get_Output_Name (M : Module; I : Port_Idx) return Sname is
begin
return Get_Output_Desc (M, I).Name;
end Get_Output_Name;
function Get_Input_Width (M : Module; I : Port_Idx) return Width is
begin
return Get_Input_Desc (M, I).W;
end Get_Input_Width;
function Get_Output_Width (M : Module; I : Port_Idx) return Width is
begin
return Get_Output_Desc (M, I).W;
end Get_Output_Width;
function Get_Input_Net (Inst : Instance; Idx : Port_Idx) return Net is
begin
return Get_Driver (Get_Input (Inst, Idx));
end Get_Input_Net;
function Get_Input_Instance (Inst : Instance; Idx : Port_Idx)
return Instance is
begin
return Get_Net_Parent (Get_Input_Net (Inst, Idx));
end Get_Input_Instance;
function Is_Const_Module (Id : Module_Id) return Boolean is
begin
case Id is
when Id_Const_UB32
| Id_Const_SB32
| Id_Const_UL32
| Id_Const_X
| Id_Const_Z
| Id_Const_0
| Id_Const_Bit
| Id_Const_Log =>
return True;
when others =>
return False;
end case;
end Is_Const_Module;
function Is_Const_Net (N : Net) return Boolean is
begin
return Is_Const_Module (Get_Id (Get_Net_Parent (N)));
end Is_Const_Net;
function Get_Net_Uns64 (N : Net) return Uns64
is
Inst : constant Instance := Get_Net_Parent (N);
begin
case Get_Id (Inst) is
when Id_Const_UB32 =>
declare
Va : constant Uns32 := Get_Param_Uns32 (Inst, 0);
Wd : constant Width := Get_Width (N);
begin
-- There must not be any garbage.
pragma Assert (Shift_Right (Va, Natural (Wd)) = 0);
return Uns64 (Va);
end;
when others =>
raise Internal_Error;
end case;
end Get_Net_Uns64;
function Get_Net_Int64 (N : Net) return Int64 is
begin
return To_Int64 (Get_Net_Uns64 (N));
end Get_Net_Int64;
procedure Get_Net_Element
(N : Net; Off : Uns32; Va : out Uns32; Zx : out Uns32)
is
Inst : constant Instance := Get_Net_Parent (N);
begin
case Get_Id (Inst) is
when Id_Const_UB32 =>
declare
V : constant Uns32 := Get_Param_Uns32 (Inst, 0);
Wd : constant Width := Get_Width (N);
begin
pragma Assert (Off < 32);
Zx := 0;
Va := Shift_Right (V, Natural (Wd - Off)) and 1;
end;
when others =>
raise Internal_Error;
end case;
end Get_Net_Element;
function Is_Connected (O : Net) return Boolean is
begin
return Get_First_Sink (O) /= No_Input;
end Is_Connected;
function Has_One_Connection (O : Net) return Boolean
is
Inp : Input;
begin
Inp := Get_First_Sink (O);
if Inp = No_Input then
-- No connection.
return False;
end if;
Inp := Get_Next_Sink (Inp);
return Inp = No_Input;
end Has_One_Connection;
procedure Disconnect_And_Free (I : Input)
is
I_Net : constant Net := Get_Driver (I);
Inst : constant Instance := Get_Net_Parent (I_Net);
Nbr_Inputs : Port_Nbr;
Nbr_Outputs : Port_Nbr;
begin
-- First disconnect.
Disconnect (I);
-- Quick check: is output (of I) still used ?
if Is_Connected (I_Net) then
return;
end if;
-- Check that all outputs are unused.
Nbr_Outputs := Get_Nbr_Outputs (Inst);
if Nbr_Outputs > 1 then
for K in 0 .. Nbr_Outputs - 1 loop
if Is_Connected (Get_Output (Inst, K)) then
return;
end if;
end loop;
end if;
-- First disconnect inputs.
Nbr_Inputs := Get_Nbr_Inputs (Inst);
if Nbr_Inputs > 0 then
for K in 0 .. Nbr_Inputs - 1 loop
Disconnect_And_Free (Get_Input (Inst, K));
end loop;
end if;
-- Free Inst
Free_Instance (Inst);
end Disconnect_And_Free;
function Clog2 (W : Width) return Width is
begin
return Uns32 (Mutils.Clog2 (Uns64 (W)));
end Clog2;
end Netlists.Utils;
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