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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 Vhdl.Std_Package;
with Vhdl.Ieee.Std_Logic_1164;
with Synth.Environment; use Synth.Environment;
with Synth.Expr; use Synth.Expr;
with Synth.Stmts;
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_Type_Width (Val.Typ);
Name := New_Sname (Get_Sname (Syn_Inst), Get_Identifier (Decl));
if Init /= null then
Ival := Get_Net (Init);
pragma Assert (Get_Width (Ival) = W);
Value := Build_Isignal (Get_Build (Syn_Inst), Name, Ival);
else
Value := Build_Signal (Get_Build (Syn_Inst), 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_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;
function Synth_Array_Type_Definition
(Syn_Inst : Synth_Instance_Acc; Def : Node) return Type_Acc
is
El_Type : constant Node := Get_Element_Subtype (Def);
El_Typ : Type_Acc;
Typ : Type_Acc;
begin
Synth_Subtype_Indication_If_Anonymous (Syn_Inst, El_Type);
El_Typ := Get_Value_Type (Syn_Inst, El_Type);
if El_Typ.Kind = Type_Bit
and then Is_One_Dimensional_Array_Type (Def)
then
Typ := Create_Unbounded_Vector (El_Typ);
else
Typ := Create_Unbounded_Array (El_Typ);
end if;
return Typ;
end Synth_Array_Type_Definition;
function Synth_Record_Type_Definition
(Syn_Inst : Synth_Instance_Acc; Def : Node) return Type_Acc
is
El_List : constant Node_Flist := Get_Elements_Declaration_List (Def);
Rec_Els : Rec_El_Array_Acc;
El : Node;
El_Typ : Type_Acc;
Off : Uns32;
Typ : Type_Acc;
begin
if not Is_Fully_Constrained_Type (Def) then
return null;
end if;
Rec_Els := Create_Rec_El_Array
(Iir_Index32 (Get_Nbr_Elements (El_List)));
Typ := Create_Record_Type (Rec_Els, 0);
Off := 0;
for I in Flist_First .. Flist_Last (El_List) loop
El := Get_Nth_Element (El_List, I);
Synth_Declaration_Type (Syn_Inst, El);
El_Typ := Get_Value_Type (Syn_Inst, Get_Type (El));
Rec_Els.E (Iir_Index32 (I + 1)) := (Off => Off,
Typ => El_Typ);
Off := Off + Get_Type_Width (El_Typ);
end loop;
Typ.W := Off;
return Typ;
end Synth_Record_Type_Definition;
procedure Synth_Type_Definition (Syn_Inst : Synth_Instance_Acc; Def : Node)
is
Typ : Type_Acc;
begin
case Get_Kind (Def) is
when Iir_Kind_Enumeration_Type_Definition =>
if Def = Vhdl.Ieee.Std_Logic_1164.Std_Ulogic_Type
or else Def = Vhdl.Ieee.Std_Logic_1164.Std_Logic_Type
then
Typ := Logic_Type;
elsif Def = Vhdl.Std_Package.Boolean_Type_Definition then
Typ := Boolean_Type;
elsif Def = Vhdl.Std_Package.Bit_Type_Definition then
Typ := Bit_Type;
else
declare
Nbr_El : constant Natural :=
Get_Nbr_Elements (Get_Enumeration_Literal_List (Def));
Rng : Discrete_Range_Type;
W : Width;
begin
W := Uns32 (Clog2 (Uns64 (Nbr_El)));
Rng := (Dir => Iir_Downto,
Is_Signed => False,
Left => Int64 (Nbr_El - 1),
Right => 0);
Typ := Create_Discrete_Type (Rng, W);
end;
end if;
when Iir_Kind_Array_Type_Definition =>
Typ := Synth_Array_Type_Definition (Syn_Inst, Def);
when Iir_Kind_Access_Type_Definition
| Iir_Kind_File_Type_Definition =>
Typ := null;
when Iir_Kind_Record_Type_Definition =>
Typ := Synth_Record_Type_Definition (Syn_Inst, Def);
when others =>
Error_Kind ("synth_type_definition", Def);
end case;
if Typ /= null then
Create_Object (Syn_Inst, Def, Create_Value_Subtype (Typ));
end if;
end Synth_Type_Definition;
procedure Synth_Anonymous_Type_Definition
(Syn_Inst : Synth_Instance_Acc; Def : Node; St : Node)
is
Typ : Type_Acc;
begin
case Get_Kind (Def) is
when Iir_Kind_Integer_Type_Definition
| Iir_Kind_Physical_Type_Definition =>
declare
Cst : constant Node := Get_Range_Constraint (St);
L, R : Int64;
Rng : Discrete_Range_Type;
W : Width;
begin
L := Get_Value (Get_Left_Limit (Cst));
R := Get_Value (Get_Right_Limit (Cst));
Rng := Synth_Discrete_Range_Expression
(L, R, Get_Direction (Cst));
W := Discrete_Range_Width (Rng);
Typ := Create_Discrete_Type (Rng, W);
end;
when Iir_Kind_Floating_Type_Definition =>
declare
Cst : constant Node := Get_Range_Constraint (St);
L, R : Fp64;
Rng : Float_Range_Type;
begin
L := Get_Fp_Value (Get_Left_Limit (Cst));
R := Get_Fp_Value (Get_Right_Limit (Cst));
Rng := (Get_Direction (Cst), L, R);
Typ := Create_Float_Type (Rng);
end;
when Iir_Kind_Array_Type_Definition =>
Typ := Synth_Array_Type_Definition (Syn_Inst, Def);
when others =>
Error_Kind ("synth_anonymous_type_definition", Def);
end case;
Create_Object (Syn_Inst, Def, Create_Value_Subtype (Typ));
end Synth_Anonymous_Type_Definition;
function Synth_Discrete_Range_Constraint
(Syn_Inst : Synth_Instance_Acc; Rng : Node) return Discrete_Range_Type is
begin
case Get_Kind (Rng) is
when Iir_Kind_Range_Expression =>
-- FIXME: check range.
return Synth_Discrete_Range_Expression (Syn_Inst, Rng);
when others =>
Error_Kind ("synth_discrete_range_constraint", Rng);
end case;
end Synth_Discrete_Range_Constraint;
function Synth_Float_Range_Constraint
(Syn_Inst : Synth_Instance_Acc; Rng : Node) return Float_Range_Type is
begin
case Get_Kind (Rng) is
when Iir_Kind_Range_Expression =>
-- FIXME: check range.
return Synth_Float_Range_Expression (Syn_Inst, Rng);
when others =>
Error_Kind ("synth_float_range_constraint", Rng);
end case;
end Synth_Float_Range_Constraint;
function Synth_Array_Subtype_Indication
(Syn_Inst : Synth_Instance_Acc; Atype : Node) return Type_Acc
is
El_Type : constant Node := Get_Element_Subtype (Atype);
St_Indexes : constant Iir_Flist := Get_Index_Subtype_List (Atype);
St_El : Iir;
Btyp : Type_Acc;
Etyp : Type_Acc;
Bnds : Bound_Array_Acc;
begin
-- VHDL08
if Get_Array_Element_Constraint (Atype) /= Null_Node
or else
(Get_Resolution_Indication (Atype) /= Null_Node
and then
(Get_Kind (Get_Resolution_Indication (Atype))
= Iir_Kind_Array_Element_Resolution))
then
-- This subtype has created a new anonymous subtype for the
-- element.
Synth_Subtype_Indication (Syn_Inst, El_Type);
end if;
Btyp := Get_Value_Type (Syn_Inst, Get_Base_Type (Atype));
if Btyp.Kind = Type_Unbounded_Vector then
St_El := Get_Index_Type (St_Indexes, 0);
return Create_Vector_Type
(Synth_Bounds_From_Range (Syn_Inst, St_El), Btyp.Uvec_El);
else
-- FIXME: partially constrained arrays, subtype in indexes...
Etyp := Get_Value_Type (Syn_Inst, El_Type);
Bnds := Create_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;
return Create_Array_Type (Bnds, Etyp);
end if;
end Synth_Array_Subtype_Indication;
procedure Synth_Subtype_Indication
(Syn_Inst : Synth_Instance_Acc; Atype : Node)
is
Typ : Type_Acc;
begin
-- TODO: handle aliases directly.
case Get_Kind (Atype) is
when Iir_Kind_Array_Subtype_Definition =>
Typ := Synth_Array_Subtype_Indication (Syn_Inst, Atype);
when Iir_Kind_Record_Subtype_Definition =>
Typ := Synth_Record_Type_Definition (Syn_Inst, Atype);
if Typ = null then
return;
end if;
when Iir_Kind_Integer_Subtype_Definition
| Iir_Kind_Physical_Subtype_Definition
| Iir_Kind_Enumeration_Subtype_Definition =>
declare
Btype : constant Type_Acc :=
Get_Value_Type (Syn_Inst, Get_Base_Type (Atype));
Rng : Discrete_Range_Type;
W : Width;
begin
if Btype.Kind = Type_Bit then
-- A subtype of a bit type is still a bit.
Typ := Btype;
else
Rng := Synth_Discrete_Range_Constraint
(Syn_Inst, Get_Range_Constraint (Atype));
W := Discrete_Range_Width (Rng);
Typ := Create_Discrete_Type (Rng, W);
end if;
end;
when Iir_Kind_Floating_Subtype_Definition =>
declare
Rng : Float_Range_Type;
begin
Rng := Synth_Float_Range_Constraint
(Syn_Inst, Get_Range_Constraint (Atype));
Typ := Create_Float_Type (Rng);
end;
when others =>
Error_Kind ("synth_subtype_indication", Atype);
end case;
Create_Object (Syn_Inst, Atype, Create_Value_Subtype (Typ));
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_Record_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;
Decl_Type : Node;
Val : Value_Acc;
Obj_Type : Type_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
-- Use the type of the declaration. The type of the constant may
-- be derived from the value.
-- FIXME: what about multiple declarations ?
Decl_Type := Get_Subtype_Indication (Decl);
if Get_Kind (Decl_Type) in Iir_Kinds_Denoting_Name then
-- Type mark.
Decl_Type := Get_Type (Get_Named_Entity (Decl_Type));
end if;
Obj_Type := Get_Value_Type (Syn_Inst, Decl_Type);
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Default_Value (Decl), Obj_Type);
Create_Object_Force (Syn_Inst, First_Decl, 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;
Val_Type : Type_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_Type := Get_Value_Type (Syn_Inst, Get_Type (Value));
Val := Synth_Expression_With_Type
(Syn_Inst, Get_Expression (Decl), Val_Type);
-- 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_Subprogram_Declaration
(Syn_Inst : Synth_Instance_Acc; Subprg : Node)
is
Inter : Node;
begin
Inter := Get_Interface_Declaration_Chain (Subprg);
while Inter /= Null_Node loop
Synth_Declaration_Type (Syn_Inst, Inter);
Inter := Get_Chain (Inter);
end loop;
end Synth_Subprogram_Declaration;
procedure Synth_Declaration
(Syn_Inst : Synth_Instance_Acc; Decl : Node; Is_Subprg : Boolean) 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;
Obj_Type : Type_Acc;
begin
Make_Object (Syn_Inst, Wire_Variable, Decl);
if Is_Valid (Def) then
Obj_Type := Get_Value_Type (Syn_Inst, Get_Type (Decl));
Init := Synth_Expression_With_Type (Syn_Inst, Def, Obj_Type);
else
Init := null;
end if;
Create_Var_Wire (Syn_Inst, Decl, Init);
if Is_Subprg and then Init /= null then
Phi_Assign (Get_Build (Syn_Inst),
Get_Value (Syn_Inst, Decl).W, Get_Net (Init), 0);
end if;
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;
Obj_Type : Type_Acc;
begin
Make_Object (Syn_Inst, Wire_Signal, Decl);
if Is_Valid (Def) then
Obj_Type := Get_Value_Type (Syn_Inst, Get_Type (Decl));
Init := Synth_Expression_With_Type (Syn_Inst, Def, Obj_Type);
else
Init := null;
end if;
Create_Var_Wire (Syn_Inst, Decl, Init);
end;
when Iir_Kind_Object_Alias_Declaration =>
Synth_Declaration_Type (Syn_Inst, Decl);
declare
Wid : Wire_Id;
Off : Uns32;
Typ : Type_Acc;
begin
Stmts.Synth_Assignment_Prefix (Syn_Inst, Get_Name (Decl),
Wid, Off, Typ);
Create_Object (Syn_Inst, Decl,
Create_Value_Alias (Wid, Off, Typ));
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 =>
Synth_Subprogram_Declaration (Syn_Inst, Decl);
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 =>
Synth_Type_Definition (Syn_Inst, Get_Type_Definition (Decl));
when Iir_Kind_Anonymous_Type_Declaration =>
Synth_Anonymous_Type_Definition
(Syn_Inst, Get_Type_Definition (Decl),
Get_Subtype_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 Iir_Kind_Psl_Default_Clock =>
-- Ignored; directly used by PSL directives.
null;
when others =>
Error_Kind ("synth_declaration", Decl);
end case;
end Synth_Declaration;
procedure Synth_Declarations
(Syn_Inst : Synth_Instance_Acc; Decls : Iir; Is_Subprg : Boolean := False)
is
Decl : Iir;
begin
Decl := Decls;
while Is_Valid (Decl) loop
Synth_Declaration (Syn_Inst, Decl, Is_Subprg);
Decl := Get_Chain (Decl);
end loop;
end Synth_Declarations;
end Synth.Decls;
|