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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 Errorout;
with Simple_IO;
with Vhdl.Utils; use Vhdl.Utils;
with Vhdl.Nodes_Walk; use Vhdl.Nodes_Walk;
with Vhdl.Prints;
with Vhdl.Errors; use Vhdl.Errors;
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 Is_Parameter (Base)
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;
-- Set Has_After to True iff WF requires a non-direct driver.
procedure Extract_Has_After (Wf : Iir) is
begin
-- Disconnect, or time expression.
if Wf = Null_Iir
or else Get_Chain (Wf) /= Null_Iir
or else Get_Time (Wf) /= Null_Iir
or else Get_Kind (Get_We_Value (Wf)) = Iir_Kind_Null_Literal
then
Has_After := True;
end if;
end Extract_Has_After;
function Extract_Driver_Stmt (Stmt : Iir) return Walk_Status
is
Status : Walk_Status;
pragma Unreferenced (Status);
begin
-- Clear Has_After. It will be set to True if a signal assignment
-- has an delay expression or a null transaction.
-- (It is cleared for any statement, just to factorize code).
Has_After := False;
case Iir_Kinds_Sequential_Statement (Get_Kind (Stmt)) is
when Iir_Kind_Simple_Signal_Assignment_Statement =>
declare
Wf : constant Iir := Get_Waveform_Chain (Stmt);
begin
if Is_Null (Wf)
or else Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform
then
-- Not unaffected or implicit disconnect.
Extract_Has_After (Wf);
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
when Iir_Kind_Conditional_Signal_Assignment_Statement =>
declare
Cond_Wf : Iir;
Wf : Iir;
Has_Drv : Boolean;
begin
Cond_Wf := Get_Conditional_Waveform_Chain (Stmt);
Has_Drv := False;
while Cond_Wf /= Null_Iir loop
Wf := Get_Waveform_Chain (Cond_Wf);
if Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform then
-- Not unaffected
Extract_Has_After (Wf);
Has_Drv := True;
end if;
Cond_Wf := Get_Chain (Cond_Wf);
end loop;
if Has_Drv then
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
when Iir_Kind_Selected_Waveform_Assignment_Statement =>
declare
Swf : Iir;
Wf : Iir;
Has_Drv : Boolean;
begin
Swf := Get_Selected_Waveform_Chain (Stmt);
Has_Drv := False;
while Swf /= Null_Iir loop
if not Get_Same_Alternative_Flag (Swf) then
Wf := Get_Associated_Chain (Swf);
if Get_Kind (Wf) /= Iir_Kind_Unaffected_Waveform then
-- Not unaffected
Extract_Has_After (Wf);
Has_Drv := True;
end if;
end if;
Swf := Get_Chain (Swf);
end loop;
if Has_Drv then
Status := Walk_Assignment_Target
(Get_Target (Stmt), Extract_Driver_Target'Access);
end if;
end;
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_Association_Interface (Assoc, Inter);
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;
Next_Association_Interface (Assoc, Inter);
end loop;
end;
when Iir_Kind_Null_Statement
| Iir_Kind_Assertion_Statement
| Iir_Kind_Report_Statement
| Iir_Kind_Wait_Statement
| Iir_Kind_Return_Statement
| Iir_Kind_Next_Statement
| Iir_Kind_Exit_Statement
| Iir_Kind_Variable_Assignment_Statement
| Iir_Kind_Conditional_Variable_Assignment_Statement
| Iir_Kind_For_Loop_Statement
| Iir_Kind_While_Loop_Statement
| Iir_Kind_Case_Statement
| Iir_Kind_If_Statement
| Iir_Kind_Break_Statement =>
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
It : List_Iterator;
begin
It := List_Iterate (List);
while Is_Valid (It) loop
Set_After_Drivers_Flag (Get_Object_Prefix (Get_Element (It)), False);
Next (It);
end loop;
Destroy_Iir_List (List);
end Free_Drivers_List;
procedure Dump_Drivers (Proc : Iir; List : Iir_List)
is
use Simple_IO;
use Errorout;
El : Iir;
It : List_Iterator;
begin
Report_Msg (Msgid_Note, Semantic, +Proc,
"List of drivers for %n:", (1 => +Proc));
Report_Msg (Msgid_Note, Semantic, +Proc,
" (declared at %l)", (1 => +Proc));
It := List_Iterate (List);
while Is_Valid (It) loop
El := Get_Element (It);
if Get_After_Drivers_Flag (Get_Object_Prefix (El)) then
Put ("* ");
else
Put (" ");
end if;
Vhdl.Prints.Disp_Vhdl (El);
New_Line;
Next (It);
end loop;
end Dump_Drivers;
end Trans_Analyzes;
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