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-- Interpreter AMS simulation
-- Copyright (C) 2014 Tristan Gingold
--
-- GHDL 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, or (at your option) any later
-- version.
--
-- GHDL 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 GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Errorout; use Errorout;
package body Simulation.AMS is
function Create_Characteristic_Expression
(Kind : Characteristic_Expr_Kind)
return Characteristic_Expressions_Index
is
begin
case Kind is
when Contribution =>
Characteristic_Expressions.Append
((Kind => Contribution,
Expr => null,
Tolerance => 0,
Dependencies => null));
when others =>
raise Program_Error;
end case;
return Characteristic_Expressions.Last;
end Create_Characteristic_Expression;
function Create_Scalar_Quantity (Kind : Quantity_Kind;
Decl : Iir;
Instance : Block_Instance_Acc)
return Quantity_Index_Type
is
begin
case Kind is
when Quantity_Reference =>
Scalar_Quantities.Append
((Kind => Quantity_Reference,
Value => 0.0,
Decl => Decl,
Instance => Instance,
Contribution =>
Create_Characteristic_Expression (Contribution)));
when Quantity_Across =>
Scalar_Quantities.Append
((Kind => Quantity_Across,
Value => 0.0,
Decl => Decl,
Instance => Instance));
when Quantity_Through =>
Scalar_Quantities.Append
((Kind => Quantity_Through,
Value => 0.0,
Decl => Decl,
Instance => Instance));
when others =>
raise Program_Error;
end case;
return Scalar_Quantities.Last;
end Create_Scalar_Quantity;
function Create_Scalar_Terminal (Decl : Iir;
Instance : Block_Instance_Acc)
return Terminal_Index_Type
is
begin
-- Simply create the reference quantity for a terminal
return Terminal_Index_Type
(Create_Scalar_Quantity (Quantity_Reference, Decl, Instance));
end Create_Scalar_Terminal;
function Get_Terminal_Reference (Terminal : Terminal_Index_Type)
return Quantity_Index_Type is
begin
return Quantity_Index_Type (Terminal);
end Get_Terminal_Reference;
procedure Add_Characteristic_Expression
(Kind : Characteristic_Expr_Kind; Expr : Ams_Term_Acc)
is
begin
Characteristic_Expressions.Append
((Kind => Kind,
Expr => Expr,
Tolerance => Default_Tolerance_Index,
Dependencies => null));
end Add_Characteristic_Expression;
procedure Compute_Dependencies (Idx : Characteristic_Expressions_Index)
is
package Quantity_Table is new GNAT.Table
(Table_Component_Type => Quantity_Index_Type,
Table_Index_Type => Natural,
Table_Low_Bound => 1,
Table_Initial => 16,
Table_Increment => 100);
El : Characteristic_Expr renames Characteristic_Expressions.Table (Idx);
Res : Quantity_Dependency_Acc := null;
procedure Add_Dependency (Block : Block_Instance_Acc; N : Iir)
is
Q : Iir_Value_Literal_Acc;
begin
case Get_Kind (N) is
when Iir_Kinds_Branch_Quantity_Declaration =>
Q := Execute_Name (Block, N, True);
Quantity_Table.Append (Q.Quantity);
when Iir_Kind_Simple_Name =>
Add_Dependency (Block, Get_Named_Entity (N));
when Iir_Kinds_Dyadic_Operator =>
Add_Dependency (Block, Get_Left (N));
Add_Dependency (Block, Get_Right (N));
when Iir_Kinds_Literal =>
null;
when others =>
Error_Kind ("compute_dependencies", N);
end case;
end Add_Dependency;
Term : Ams_Term_Acc := El.Expr;
begin
pragma Assert (El.Dependencies = null);
while Term /= null loop
case Term.Op is
when Op_Quantity =>
Quantity_Table.Append (Term.Quantity);
when Op_Vhdl_Expr =>
Add_Dependency (Term.Vhdl_Instance, Term.Vhdl_Expr);
end case;
Term := Term.Next;
end loop;
Res := new Quantity_Dependency_Type (Nbr => Quantity_Table.Last);
for I in Quantity_Table.First .. Quantity_Table.Last loop
Res.Quantities (I) := Quantity_Table.Table (I);
end loop;
Quantity_Table.Free;
El.Dependencies := Res;
end Compute_Dependencies;
function Build (Op : Ams_Sign;
Val : Quantity_Index_Type;
Right : Ams_Term_Acc := null)
return Ams_Term_Acc
is
begin
return new Ams_Term'(Op => Op_Quantity,
Sign => Op,
Next => Right,
Quantity => Val);
end Build;
function Build (Op : Ams_Sign;
Instance : Block_Instance_Acc;
Expr : Iir;
Right : Ams_Term_Acc := null)
return Ams_Term_Acc
is
begin
return new Ams_Term'
(Op => Op_Vhdl_Expr,
Sign => Op,
Vhdl_Expr => Expr,
Vhdl_Instance => Instance,
Next => Right);
end Build;
procedure Append_Characteristic_Expression
(Terminal : Terminal_Index_Type; Expr : Ams_Term_Acc)
is
Ref : constant Quantity_Index_Type := Get_Terminal_Reference (Terminal);
Ce : constant Characteristic_Expressions_Index :=
Scalar_Quantities.Table (Ref).Contribution;
begin
pragma Assert (Expr.Next = null);
Expr.Next := Characteristic_Expressions.Table (Ce).Expr;
Characteristic_Expressions.Table (Ce).Expr := Expr;
end Append_Characteristic_Expression;
procedure Create_Tables is
begin
for I in Characteristic_Expressions.First
.. Characteristic_Expressions.Last
loop
Compute_Dependencies (I);
end loop;
end Create_Tables;
end Simulation.AMS;
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