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-- Elaborate statements
-- Copyright (C) 2021 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, see <gnu.org/licenses>.
with Types; use Types;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Utils; use Vhdl.Utils;
with Elab.Vhdl_Objtypes; use Elab.Vhdl_Objtypes;
with Elab.Vhdl_Values; use Elab.Vhdl_Values;
with Elab.Vhdl_Types; use Elab.Vhdl_Types;
with Elab.Vhdl_Decls; use Elab.Vhdl_Decls;
with Elab.Vhdl_Insts; use Elab.Vhdl_Insts;
with Elab.Vhdl_Expr; use Elab.Vhdl_Expr;
package body Elab.Vhdl_Stmts is
function Elab_Generate_Statement_Body (Syn_Inst : Synth_Instance_Acc;
Bod : Node;
Config : Node;
Iterator : Node := Null_Node;
Iterator_Val : Valtyp := No_Valtyp)
return Synth_Instance_Acc
is
Decls_Chain : constant Node := Get_Declaration_Chain (Bod);
Bod_Inst : Synth_Instance_Acc;
begin
Bod_Inst := Make_Elab_Instance (Syn_Inst, Bod, Config);
if Iterator /= Null_Node then
-- Add the iterator (for for-generate).
Create_Object (Bod_Inst, Iterator, Iterator_Val);
end if;
Elab_Declarations (Bod_Inst, Decls_Chain);
Elab_Concurrent_Statements
(Bod_Inst, Get_Concurrent_Statement_Chain (Bod));
return Bod_Inst;
end Elab_Generate_Statement_Body;
procedure Elab_For_Generate_Statement
(Syn_Inst : Synth_Instance_Acc; Stmt : Node)
is
Iterator : constant Node := Get_Parameter_Specification (Stmt);
Bod : constant Node := Get_Generate_Statement_Body (Stmt);
Configs : constant Node := Get_Generate_Block_Configuration (Bod);
It_Type : constant Node := Get_Declaration_Type (Iterator);
Gen_Inst : Synth_Instance_Acc;
Sub_Inst : Synth_Instance_Acc;
Config : Node;
It_Rng : Type_Acc;
Val : Valtyp;
Ival : Valtyp;
Len : Uns32;
begin
if It_Type /= Null_Node then
Synth_Subtype_Indication (Syn_Inst, It_Type);
end if;
-- Initial value.
It_Rng := Get_Subtype_Object (Syn_Inst, Get_Type (Iterator));
Len := Get_Range_Length (It_Rng.Drange);
Val := Create_Value_Discrete (It_Rng.Drange.Left, It_Rng);
Gen_Inst := Make_Elab_Generate_Instance
(Syn_Inst, Stmt, Configs, Natural (Len));
Create_Sub_Instance (Syn_Inst, Stmt, Gen_Inst);
for I in 1 .. Len loop
-- Find and apply the config block.
declare
Spec : Node;
begin
Config := Configs;
while Config /= Null_Node loop
Spec := Get_Block_Specification (Config);
case Get_Kind (Spec) is
when Iir_Kind_Simple_Name =>
exit;
when others =>
Error_Kind ("elab_for_generate_statement", Spec);
end case;
Config := Get_Prev_Block_Configuration (Config);
end loop;
Apply_Block_Configuration (Config, Bod);
end;
-- Create a copy of the current iterator value for the generate
-- block.
Ival := Create_Value_Discrete (Read_Discrete (Val), It_Rng);
Sub_Inst := Elab_Generate_Statement_Body
(Gen_Inst, Bod, Config, Iterator, Ival);
Set_Generate_Sub_Instance (Gen_Inst, Positive (I), Sub_Inst);
Update_Index (It_Rng.Drange, Val);
end loop;
end Elab_For_Generate_Statement;
procedure Elab_If_Generate_Statement
(Syn_Inst : Synth_Instance_Acc; Stmt : Node)
is
Gen : Node;
Bod : Node;
Icond : Node;
Cond : Valtyp;
Config : Node;
Sub_Inst : Synth_Instance_Acc;
begin
Gen := Stmt;
loop
Icond := Get_Condition (Gen);
if Icond /= Null_Node then
Cond := Exec_Expression (Syn_Inst, Icond);
Strip_Const (Cond);
else
-- It is the else generate.
Cond := No_Valtyp;
end if;
if Cond = No_Valtyp or else Read_Discrete (Cond) = 1 then
Bod := Get_Generate_Statement_Body (Gen);
Config := Get_Generate_Block_Configuration (Bod);
Apply_Block_Configuration (Config, Bod);
Sub_Inst := Elab_Generate_Statement_Body (Syn_Inst, Bod, Config);
Create_Sub_Instance (Syn_Inst, Bod, Sub_Inst);
return;
end if;
Gen := Get_Generate_Else_Clause (Gen);
exit when Gen = Null_Node;
end loop;
-- Not generated.
Create_Sub_Instance (Syn_Inst, Stmt, null);
end Elab_If_Generate_Statement;
procedure Elab_Block_Statement (Syn_Inst : Synth_Instance_Acc; Blk : Node)
is
Blk_Inst : Synth_Instance_Acc;
begin
-- No support for guard or header.
if Get_Block_Header (Blk) /= Null_Node
or else Get_Guard_Decl (Blk) /= Null_Node
then
raise Internal_Error;
end if;
Apply_Block_Configuration
(Get_Block_Block_Configuration (Blk), Blk);
Blk_Inst := Make_Elab_Instance (Syn_Inst, Blk, Null_Iir);
Create_Sub_Instance (Syn_Inst, Blk, Blk_Inst);
Elab_Declarations (Blk_Inst, Get_Declaration_Chain (Blk));
Elab_Concurrent_Statements
(Blk_Inst, Get_Concurrent_Statement_Chain (Blk));
end Elab_Block_Statement;
procedure Elab_Concurrent_Statement
(Syn_Inst : Synth_Instance_Acc; Stmt : Node) is
begin
case Get_Kind (Stmt) is
when Iir_Kinds_Process_Statement =>
null;
when Iir_Kind_Concurrent_Simple_Signal_Assignment
| Iir_Kind_Concurrent_Selected_Signal_Assignment
| Iir_Kind_Concurrent_Conditional_Signal_Assignment
| Iir_Kind_Concurrent_Assertion_Statement
| Iir_Kind_Concurrent_Procedure_Call_Statement
| Iir_Kind_Concurrent_Break_Statement
| Iir_Kind_Simple_Simultaneous_Statement
| Iir_Kind_Psl_Default_Clock
| Iir_Kind_Psl_Restrict_Directive
| Iir_Kind_Psl_Assume_Directive
| Iir_Kind_Psl_Assert_Directive
| Iir_Kind_Psl_Cover_Directive
| Iir_Kind_Psl_Declaration =>
null;
when Iir_Kind_Component_Instantiation_Statement =>
if Is_Component_Instantiation (Stmt) then
Elab_Component_Instantiation_Statement (Syn_Inst, Stmt);
else
Elab_Design_Instantiation_Statement (Syn_Inst, Stmt);
end if;
when Iir_Kind_For_Generate_Statement =>
Elab_For_Generate_Statement (Syn_Inst, Stmt);
when Iir_Kind_If_Generate_Statement =>
Elab_If_Generate_Statement (Syn_Inst, Stmt);
when Iir_Kind_Block_Statement =>
Elab_Block_Statement (Syn_Inst, Stmt);
when others =>
Error_Kind ("elab_concurrent_statement", Stmt);
end case;
end Elab_Concurrent_Statement;
procedure Elab_Concurrent_Statements
(Syn_Inst : Synth_Instance_Acc; Chain : Node)
is
Stmt : Node;
begin
if Chain = Null_Node then
return;
end if;
Stmt := Chain;
while Stmt /= Null_Node loop
Elab_Concurrent_Statement (Syn_Inst, Stmt);
Stmt := Get_Chain (Stmt);
end loop;
end Elab_Concurrent_Statements;
end Elab.Vhdl_Stmts;
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