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-- Analysis for translation.
-- Copyright (C) 2009 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 GCC; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Iirs_Utils; use Iirs_Utils;
with Iirs_Walk; use Iirs_Walk;
with Disp_Vhdl;
with Ada.Text_IO;
with Errorout;
package body Trans_Analyzes is
Driver_List : Iir_List;
Has_After : Boolean;
function Extract_Driver_Target (Target : Iir) return Walk_Status
is
Base : Iir;
Prefix : Iir;
begin
Base := Get_Object_Prefix (Target);
-- Assigment to subprogram interface does not create a driver.
if Get_Kind (Base) = Iir_Kind_Interface_Signal_Declaration
and then
Get_Kind (Get_Parent (Base)) = Iir_Kind_Procedure_Declaration
then
return Walk_Continue;
end if;
Prefix := Get_Longuest_Static_Prefix (Target);
Add_Element (Driver_List, Prefix);
if Has_After then
Set_After_Drivers_Flag (Base, True);
end if;
return Walk_Continue;
end Extract_Driver_Target;
function Extract_Driver_Stmt (Stmt : Iir) return Walk_Status
is
Status : Walk_Status;
pragma Unreferenced (Status);
We : Iir;
begin
case Get_Kind (Stmt) is
when Iir_Kind_Signal_Assignment_Statement =>
We := Get_Waveform_Chain (Stmt);
if We /= Null_Iir
and then Get_Chain (We) = Null_Iir
and then Get_Time (We) = Null_Iir
and then Get_Kind (Get_We_Value (We)) /= Iir_Kind_Null_Literal
then
Has_After := False;
else
Has_After := True;
end if;
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
when Iir_Kind_Procedure_Call_Statement =>
declare
Call : constant Iir := Get_Procedure_Call (Stmt);
Assoc : Iir;
Formal : Iir;
Inter : Iir;
begin
-- Very pessimist.
Has_After := True;
Assoc := Get_Parameter_Association_Chain (Call);
Inter := Get_Interface_Declaration_Chain
(Get_Implementation (Call));
while Assoc /= Null_Iir loop
Formal := Get_Formal (Assoc);
if Formal = Null_Iir then
Formal := Inter;
Inter := Get_Chain (Inter);
else
Formal := Get_Association_Interface (Assoc);
end if;
if Get_Kind (Assoc)
= Iir_Kind_Association_Element_By_Expression
and then
Get_Kind (Formal) = Iir_Kind_Interface_Signal_Declaration
and then Get_Mode (Formal) /= Iir_In_Mode
then
Status := Extract_Driver_Target (Get_Actual (Assoc));
end if;
Assoc := Get_Chain (Assoc);
end loop;
end;
when others =>
null;
end case;
return Walk_Continue;
end Extract_Driver_Stmt;
procedure Extract_Drivers_Sequential_Stmt_Chain (Chain : Iir)
is
Status : Walk_Status;
pragma Unreferenced (Status);
begin
Status := Walk_Sequential_Stmt_Chain (Chain, Extract_Driver_Stmt'Access);
end Extract_Drivers_Sequential_Stmt_Chain;
procedure Extract_Drivers_Declaration_Chain (Chain : Iir)
is
Decl : Iir := Chain;
begin
while Decl /= Null_Iir loop
-- Only procedures and impure functions may contain assignment.
if Get_Kind (Decl) = Iir_Kind_Procedure_Body
or else (Get_Kind (Decl) = Iir_Kind_Function_Body
and then
not Get_Pure_Flag (Get_Subprogram_Specification (Decl)))
then
Extract_Drivers_Declaration_Chain (Get_Declaration_Chain (Decl));
Extract_Drivers_Sequential_Stmt_Chain
(Get_Sequential_Statement_Chain (Decl));
end if;
Decl := Get_Chain (Decl);
end loop;
end Extract_Drivers_Declaration_Chain;
function Extract_Drivers (Proc : Iir) return Iir_List
is
begin
Driver_List := Create_Iir_List;
Extract_Drivers_Declaration_Chain (Get_Declaration_Chain (Proc));
Extract_Drivers_Sequential_Stmt_Chain
(Get_Sequential_Statement_Chain (Proc));
return Driver_List;
end Extract_Drivers;
procedure Free_Drivers_List (List : in out Iir_List)
is
El : Iir;
begin
for I in Natural loop
El := Get_Nth_Element (List, I);
exit when El = Null_Iir;
Set_After_Drivers_Flag (Get_Object_Prefix (El), False);
end loop;
Destroy_Iir_List (List);
end Free_Drivers_List;
procedure Dump_Drivers (Proc : Iir; List : Iir_List)
is
use Ada.Text_IO;
use Errorout;
El : Iir;
begin
Put_Line ("List of drivers for " & Disp_Node (Proc) & ":");
Put_Line (" (declared at " & Disp_Location (Proc) & ")");
for I in Natural loop
El := Get_Nth_Element (List, I);
exit when El = Null_Iir;
if Get_After_Drivers_Flag (Get_Object_Prefix (El)) then
Put ("* ");
else
Put (" ");
end if;
Disp_Vhdl.Disp_Vhdl (El);
New_Line;
end loop;
end Dump_Drivers;
end Trans_Analyzes;
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