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|
-- Create declarations for synthesis.
-- 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 Types; use Types;
with Mutils; use Mutils;
with Netlists; use Netlists;
with Netlists.Builders; use Netlists.Builders;
with Vhdl.Errors; use Vhdl.Errors;
with Vhdl.Utils; use Vhdl.Utils;
with Synth.Types; use Synth.Types;
with Synth.Values; use Synth.Values;
with Synth.Environment; use Synth.Environment;
with Synth.Expr; use Synth.Expr;
with Vhdl.Annotations; use Vhdl.Annotations;
package body Synth.Decls is
procedure Synth_Anonymous_Subtype_Indication
(Syn_Inst : Synth_Instance_Acc; Atype : Node);
procedure Create_Var_Wire
(Syn_Inst : Synth_Instance_Acc; Decl : Iir; Init : Value_Acc)
is
Val : constant Value_Acc := Get_Value (Syn_Inst, Decl);
Value : Net;
Ival : Net;
W : Width;
Name : Sname;
begin
case Val.Kind is
when Value_Wire =>
-- FIXME: get the width directly from the wire ?
W := Get_Bound_Width (Val.W_Bound);
Name := New_Sname (Syn_Inst.Name, Get_Identifier (Decl));
if Init /= null then
Ival := Get_Net (Init, Get_Type (Decl));
pragma Assert (Get_Width (Ival) = W);
Value := Build_Isignal (Build_Context, Name, Ival);
else
Value := Build_Signal (Build_Context, Name, W);
end if;
Set_Location (Value, Decl);
Set_Wire_Gate (Val.W, Value);
when others =>
raise Internal_Error;
end case;
end Create_Var_Wire;
procedure Synth_Type_Definition (Syn_Inst : Synth_Instance_Acc; Def : Node)
is
begin
case Get_Kind (Def) is
when Iir_Kind_Enumeration_Type_Definition =>
declare
Info : constant Sim_Info_Acc := Get_Info (Def);
Enum_List : constant Node_Flist :=
Get_Enumeration_Literal_List (Def);
begin
if Is_Bit_Type (Def) then
Info.Width := 1;
else
Info.Width :=
Uns32 (Clog2 (Uns64 (Get_Nbr_Elements (Enum_List))));
end if;
end;
when Iir_Kind_Integer_Type_Definition
| Iir_Kind_Floating_Type_Definition
| Iir_Kind_Physical_Type_Definition
| Iir_Kind_Array_Type_Definition =>
null;
when Iir_Kind_Access_Type_Definition
| Iir_Kind_File_Type_Definition =>
null;
when Iir_Kind_Record_Type_Definition =>
declare
El_List : constant Node_Flist :=
Get_Elements_Declaration_List (Def);
El : Node;
begin
for I in Flist_First .. Flist_Last (El_List) loop
El := Get_Nth_Element (El_List, I);
Synth_Declaration_Type (Syn_Inst, El);
end loop;
end;
when others =>
Error_Kind ("synth_type_definition", Def);
end case;
end Synth_Type_Definition;
function Synth_Range_Constraint
(Syn_Inst : Synth_Instance_Acc; Rng : Node) return Value_Acc is
begin
case Get_Kind (Rng) is
when Iir_Kind_Range_Expression =>
-- FIXME: check range.
return Synth_Range_Expression (Syn_Inst, Rng);
when others =>
Error_Kind ("synth_range_constraint", Rng);
end case;
end Synth_Range_Constraint;
procedure Synth_Subtype_Indication_If_Anonymous
(Syn_Inst : Synth_Instance_Acc; Atype : Node) is
begin
if Get_Type_Declarator (Atype) = Null_Node then
Synth_Subtype_Indication (Syn_Inst, Atype);
end if;
end Synth_Subtype_Indication_If_Anonymous;
procedure Synth_Subtype_Indication
(Syn_Inst : Synth_Instance_Acc; Atype : Node) is
begin
case Get_Kind (Atype) is
when Iir_Kind_Array_Subtype_Definition =>
-- LRM93 12.3.1.3
-- The elaboration of an index constraint consists of the
-- declaration of each of the discrete ranges in the index
-- constraint in some order that is not defined by the language.
Synth_Subtype_Indication_If_Anonymous
(Syn_Inst, Get_Element_Subtype (Atype));
declare
St_Indexes : constant Iir_Flist :=
Get_Index_Subtype_List (Atype);
St_El : Iir;
Bnds : Value_Bound_Array_Acc;
begin
-- FIXME: partially constrained arrays, subtype in indexes...
Bnds := Create_Value_Bound_Array
(Iir_Index32 (Get_Nbr_Elements (St_Indexes)));
for I in Flist_First .. Flist_Last (St_Indexes) loop
St_El := Get_Index_Type (St_Indexes, I);
Bnds.D (Iir_Index32 (I + 1)) :=
Synth_Bounds_From_Range (Syn_Inst, St_El);
end loop;
Create_Object (Syn_Inst, Atype,
Create_Value_Bounds (Bnds));
end;
when Iir_Kind_Integer_Subtype_Definition
| Iir_Kind_Floating_Subtype_Definition
| Iir_Kind_Physical_Subtype_Definition
| Iir_Kind_Enumeration_Subtype_Definition =>
declare
Val : Value_Acc;
begin
Val := Synth_Range_Constraint
(Syn_Inst, Get_Range_Constraint (Atype));
Create_Object (Syn_Inst, Atype, Unshare (Val, Instance_Pool));
end;
when others =>
Error_Kind ("synth_subtype_indication", Atype);
end case;
end Synth_Subtype_Indication;
procedure Synth_Anonymous_Subtype_Indication
(Syn_Inst : Synth_Instance_Acc; Atype : Node) is
begin
if Atype = Null_Node
or else Get_Type_Declarator (Atype) /= Null_Node
then
return;
end if;
Synth_Subtype_Indication (Syn_Inst, Atype);
end Synth_Anonymous_Subtype_Indication;
pragma Unreferenced (Synth_Anonymous_Subtype_Indication);
function Get_Declaration_Type (Decl : Node) return Node
is
Ind : constant Node := Get_Subtype_Indication (Decl);
Atype : Node;
begin
if Ind = Null_Node then
-- No subtype indication; use the same type.
return Null_Node;
end if;
Atype := Ind;
loop
case Get_Kind (Atype) is
when Iir_Kinds_Denoting_Name =>
Atype := Get_Named_Entity (Atype);
when Iir_Kind_Subtype_Declaration
| Iir_Kind_Type_Declaration =>
-- Type already declared, so already handled.
return Null_Node;
when Iir_Kind_Array_Subtype_Definition
| Iir_Kind_Integer_Subtype_Definition
| Iir_Kind_Floating_Subtype_Definition
| Iir_Kind_Physical_Subtype_Definition
| Iir_Kind_Enumeration_Subtype_Definition =>
return Atype;
when others =>
Error_Kind ("get_declaration_type", Atype);
end case;
end loop;
end Get_Declaration_Type;
procedure Synth_Declaration_Type
(Syn_Inst : Synth_Instance_Acc; Decl : Node)
is
Atype : constant Node := Get_Declaration_Type (Decl);
begin
if Atype = Null_Node then
return;
end if;
Synth_Subtype_Indication (Syn_Inst, Atype);
end Synth_Declaration_Type;
procedure Synth_Constant_Declaration
(Syn_Inst : Synth_Instance_Acc; Decl : Node)
is
Deferred_Decl : constant Node := Get_Deferred_Declaration (Decl);
First_Decl : Node;
Val : Value_Acc;
begin
if Deferred_Decl = Null_Node
or else Get_Deferred_Declaration_Flag (Decl)
then
-- Create the object (except for full declaration of a
-- deferred constant).
Synth_Declaration_Type (Syn_Inst, Decl);
Create_Object (Syn_Inst, Decl, null);
end if;
-- Initialize the value (except for a deferred declaration).
if Deferred_Decl = Null_Node then
First_Decl := Decl;
elsif not Get_Deferred_Declaration_Flag (Decl) then
First_Decl := Deferred_Decl;
else
First_Decl := Null_Node;
end if;
if First_Decl /= Null_Node then
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Default_Value (Decl), Get_Type (Decl));
Syn_Inst.Objects (Get_Info (First_Decl).Slot) := Val;
end if;
end Synth_Constant_Declaration;
procedure Synth_Attribute_Specification
(Syn_Inst : Synth_Instance_Acc; Decl : Node)
is
Value : Iir_Attribute_Value;
Val : Value_Acc;
begin
Value := Get_Attribute_Value_Spec_Chain (Decl);
while Value /= Null_Iir loop
-- 2. The expression is evaluated to determine the value
-- of the attribute.
-- It is an error if the value of the expression does not
-- belong to the subtype of the attribute; if the
-- attribute is of an array type, then an implicit
-- subtype conversion is first performed on the value,
-- unless the attribute's subtype indication denotes an
-- unconstrained array type.
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Expression (Decl), Get_Type (Value));
-- Check_Constraints (Instance, Val, Attr_Type, Decl);
-- 3. A new instance of the designated attribute is created
-- and associated with each of the affected items.
--
-- 4. Each new attribute instance is assigned the value of
-- the expression.
Create_Object (Syn_Inst, Value, Val);
-- Unshare (Val, Instance_Pool);
Value := Get_Spec_Chain (Value);
end loop;
end Synth_Attribute_Specification;
procedure Synth_Declaration (Syn_Inst : Synth_Instance_Acc; Decl : Node) is
begin
case Get_Kind (Decl) is
when Iir_Kind_Variable_Declaration =>
Synth_Declaration_Type (Syn_Inst, Decl);
declare
Def : constant Iir := Get_Default_Value (Decl);
-- Slot : constant Object_Slot_Type := Get_Info (Decl).Slot;
Init : Value_Acc;
begin
Make_Object (Syn_Inst, Wire_Variable, Decl);
if Is_Valid (Def) then
Init := Synth_Expression_With_Type
(Syn_Inst, Def, Get_Type (Decl));
else
Init := null;
end if;
Create_Var_Wire (Syn_Inst, Decl, Init);
end;
when Iir_Kind_Interface_Variable_Declaration =>
-- Ignore default value.
Make_Object (Syn_Inst, Wire_Variable, Decl);
Create_Var_Wire (Syn_Inst, Decl, null);
when Iir_Kind_Constant_Declaration =>
Synth_Constant_Declaration (Syn_Inst, Decl);
when Iir_Kind_Signal_Declaration =>
Synth_Declaration_Type (Syn_Inst, Decl);
declare
Def : constant Iir := Get_Default_Value (Decl);
-- Slot : constant Object_Slot_Type := Get_Info (Decl).Slot;
Init : Value_Acc;
begin
Make_Object (Syn_Inst, Wire_Signal, Decl);
if Is_Valid (Def) then
Init := Synth_Expression_With_Type
(Syn_Inst, Def, Get_Type (Decl));
else
Init := null;
end if;
Create_Var_Wire (Syn_Inst, Decl, Init);
end;
when Iir_Kind_Anonymous_Signal_Declaration =>
Make_Object (Syn_Inst, Wire_Signal, Decl);
Create_Var_Wire (Syn_Inst, Decl, null);
when Iir_Kind_Procedure_Declaration
| Iir_Kind_Function_Declaration =>
-- TODO: elaborate interfaces
null;
when Iir_Kind_Procedure_Body
| Iir_Kind_Function_Body =>
null;
when Iir_Kind_Non_Object_Alias_Declaration =>
null;
when Iir_Kind_Attribute_Declaration =>
-- Nothing to do: the type is a type_mark, not a subtype
-- indication.
null;
when Iir_Kind_Attribute_Specification =>
Synth_Attribute_Specification (Syn_Inst, Decl);
when Iir_Kind_Type_Declaration
| Iir_Kind_Anonymous_Type_Declaration =>
Synth_Type_Definition (Syn_Inst, Get_Type_Definition (Decl));
when Iir_Kind_Subtype_Declaration =>
Synth_Declaration_Type (Syn_Inst, Decl);
when Iir_Kind_Component_Declaration =>
null;
when Iir_Kind_File_Declaration =>
null;
when others =>
Error_Kind ("synth_declaration", Decl);
end case;
end Synth_Declaration;
procedure Synth_Declarations (Syn_Inst : Synth_Instance_Acc; Decls : Iir)
is
Decl : Iir;
begin
Decl := Decls;
while Is_Valid (Decl) loop
Synth_Declaration (Syn_Inst, Decl);
Decl := Get_Chain (Decl);
end loop;
end Synth_Declarations;
end Synth.Decls;
|