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|
-- Values in 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 Areapools; use Areapools;
with Grt.Files_Operations;
with Netlists; use Netlists;
with Vhdl.Nodes; use Vhdl.Nodes;
with Synth.Environment; use Synth.Environment;
with Synth.Source; use Synth.Source;
package Synth.Values is
type Discrete_Range_Type is record
-- An integer range.
Dir : Iir_Direction;
-- Netlist representation: signed or unsigned, width of vector.
Is_Signed : Boolean;
Left : Int64;
Right : Int64;
end record;
-- Return the width of RNG.
function Discrete_Range_Width (Rng : Discrete_Range_Type) return Width;
type Float_Range_Type is record
Dir : Iir_Direction;
Left : Fp64;
Right : Fp64;
end record;
type Bound_Type is record
Dir : Iir_Direction;
Left : Int32;
Right : Int32;
Len : Width;
end record;
type Bound_Array_Type is array (Iir_Index32 range <>) of Bound_Type;
type Bound_Array (Len : Iir_Index32) is record
D : Bound_Array_Type (1 .. Len);
end record;
type Bound_Array_Acc is access Bound_Array;
type Type_Kind is
(
Type_Bit,
Type_Logic,
Type_Discrete,
Type_Float,
Type_Vector,
Type_Unbounded_Vector,
-- A slice is for a slice of vector with dynamic bounds. So the bounds
-- of the result aren't known, but its width is.
Type_Slice,
Type_Array,
Type_Unbounded_Array,
Type_Record,
Type_Access,
Type_File
);
subtype Type_Nets is Type_Kind range Type_Bit .. Type_Logic;
type Type_Type (Kind : Type_Kind);
type Type_Acc is access Type_Type;
type Rec_El_Type is record
Off : Uns32;
Typ : Type_Acc;
end record;
type Rec_El_Array_Type is array (Iir_Index32 range <>) of Rec_El_Type;
type Rec_El_Array (Len : Iir_Index32) is record
E : Rec_El_Array_Type (1 .. Len);
end record;
type Rec_El_Array_Acc is access Rec_El_Array;
type Type_Type (Kind : Type_Kind) is record
-- False if the type is not synthesisable: is or contains access/file.
Is_Synth : Boolean;
-- Number of bits for this type.
W : Width;
case Kind is
when Type_Bit
| Type_Logic =>
null;
when Type_Discrete =>
Drange : Discrete_Range_Type;
when Type_Float =>
Frange : Float_Range_Type;
when Type_Vector =>
Vbound : Bound_Type;
Vec_El : Type_Acc;
when Type_Unbounded_Vector =>
Uvec_El : Type_Acc;
when Type_Slice =>
Slice_El : Type_Acc;
when Type_Array =>
Abounds : Bound_Array_Acc;
Arr_El : Type_Acc;
when Type_Unbounded_Array =>
Uarr_Ndim : Iir_Index32;
Uarr_El : Type_Acc;
when Type_Record =>
Rec : Rec_El_Array_Acc;
when Type_Access =>
Acc_Acc : Type_Acc;
when Type_File =>
File_Typ : Type_Acc;
end case;
end record;
-- Values is how signals and variables are decomposed. This is similar to
-- values in simulation, but simplified (no need to handle files,
-- accesses...)
type Value_Kind is
(
-- Value is for a vector or a bit, and is the output of a gate.
Value_Net,
-- Also a vector or a bit, but from an object. Has to be transformed
-- into a net.
Value_Wire,
-- A discrete value (integer or enumeration).
Value_Discrete,
Value_Float,
-- An array (const if all elements are constants).
Value_Array,
Value_Const_Array,
-- A record (const if all elements are constants).
Value_Record,
Value_Const_Record,
Value_Access,
Value_File,
-- A package.
Value_Instance,
-- A constant. This is a named value. One purpose is to avoid to
-- create many times the same net for the same value.
Value_Const,
-- An alias. This is a reference to another value with a different
-- (but compatible) type.
Value_Alias,
-- A subtype. Contains only a type.
Value_Subtype
);
type Value_Type (Kind : Value_Kind);
type Value_Acc is access Value_Type;
type Value_Type_Array is array (Iir_Index32 range <>) of Value_Acc;
type Value_Array_Type (Len : Iir_Index32) is record
-- Values are from left to right. So V(1) is at index 'Left.
V : Value_Type_Array (1 .. Len);
end record;
type Value_Array_Acc is access Value_Array_Type;
type Instance_Id is new Nat32;
type Heap_Index is new Uns32;
Null_Heap_Index : constant Heap_Index := 0;
subtype File_Index is Grt.Files_Operations.Ghdl_File_Index;
type Value_Type (Kind : Value_Kind) is record
Typ : Type_Acc;
case Kind is
when Value_Net =>
N : Net;
when Value_Wire =>
W : Wire_Id;
when Value_Discrete =>
Scal : Int64;
when Value_Float =>
Fp : Fp64;
when Value_Array
| Value_Const_Array =>
Arr : Value_Array_Acc;
when Value_Record
| Value_Const_Record =>
Rec : Value_Array_Acc;
when Value_Access =>
Acc : Heap_Index;
when Value_File =>
File : File_Index;
when Value_Instance =>
Instance : Instance_Id;
when Value_Subtype =>
null;
when Value_Const =>
C_Val : Value_Acc;
C_Loc : Syn_Src;
C_Net : Net;
when Value_Alias =>
A_Obj : Value_Acc;
A_Off : Uns32;
end case;
end record;
Global_Pool : aliased Areapool;
Expr_Pool : aliased Areapool;
-- Areapool used by Create_*_Value
Current_Pool : Areapool_Acc := Expr_Pool'Access;
-- Pool for objects allocated in the current instance.
Instance_Pool : Areapool_Acc;
-- Types.
function Create_Discrete_Type (Rng : Discrete_Range_Type; W : Width)
return Type_Acc;
function Create_Float_Type (Rng : Float_Range_Type) return Type_Acc;
function Create_Vec_Type_By_Length (Len : Width; El : Type_Acc)
return Type_Acc;
function Create_Vector_Type (Bnd : Bound_Type; El_Type : Type_Acc)
return Type_Acc;
function Create_Unbounded_Vector (El_Type : Type_Acc) return Type_Acc;
function Create_Slice_Type (W : Width; El_Type : Type_Acc) return Type_Acc;
function Create_Bound_Array (Ndims : Iir_Index32) return Bound_Array_Acc;
function Create_Array_Type (Bnd : Bound_Array_Acc; El_Type : Type_Acc)
return Type_Acc;
function Create_Unbounded_Array (Ndim : Iir_Index32; El_Type : Type_Acc)
return Type_Acc;
function Create_Rec_El_Array (Nels : Iir_Index32) return Rec_El_Array_Acc;
function Create_Record_Type (Els : Rec_El_Array_Acc; W : Width)
return Type_Acc;
function Create_Access_Type (Acc_Type : Type_Acc) return Type_Acc;
function Create_File_Type (File_Type : Type_Acc) return Type_Acc;
-- Return the element of a vector/array/unbounded_array.
function Get_Array_Element (Arr_Type : Type_Acc) return Type_Acc;
function Is_Bounded_Type (Typ : Type_Acc) return Boolean;
-- True if VAL is static, ie contains neither nets nor wires.
function Is_Static (Val : Value_Acc) return Boolean;
-- Can also return true for nets and wires.
function Is_Static_Val (Val : Value_Acc) return Boolean;
function Is_Equal (L, R : Value_Acc) return Boolean;
function Are_Types_Equal (L, R : Type_Acc) return Boolean;
-- Create a Value_Net.
function Create_Value_Net (N : Net; Ntype : Type_Acc) return Value_Acc;
-- Create a Value_Wire. For a bit wire, RNG must be null.
function Create_Value_Wire (W : Wire_Id; Wtype : Type_Acc) return Value_Acc;
function Create_Value_Discrete (Val : Int64; Vtype : Type_Acc)
return Value_Acc;
function Create_Value_Float (Val : Fp64; Vtype : Type_Acc) return Value_Acc;
function Create_Value_Access (Vtype : Type_Acc; Acc : Heap_Index)
return Value_Acc;
function Create_Value_File (Vtype : Type_Acc; File : File_Index)
return Value_Acc;
function Create_Value_Subtype (Typ : Type_Acc) return Value_Acc;
function Create_Value_Array (Len : Iir_Index32) return Value_Array_Acc;
-- Create a Value_Array.
function Create_Value_Array (Bounds : Type_Acc; Arr : Value_Array_Acc)
return Value_Acc;
function Create_Value_Const_Array (Bounds : Type_Acc; Arr : Value_Array_Acc)
return Value_Acc;
-- Like the previous one but automatically build the array.
function Create_Value_Array (Bounds : Type_Acc) return Value_Acc;
-- Allocate the ARR component of the Value_Type ARR, using BOUNDS.
procedure Create_Array_Data (Arr : Value_Acc);
function Create_Value_Record (Typ : Type_Acc; Els : Value_Array_Acc)
return Value_Acc;
function Create_Value_Const_Record (Typ : Type_Acc; Els : Value_Array_Acc)
return Value_Acc;
function Create_Value_Instance (Inst : Instance_Id) return Value_Acc;
function Create_Value_Alias (Obj : Value_Acc; Off : Uns32; Typ : Type_Acc)
return Value_Acc;
function Create_Value_Const (Val : Value_Acc; Loc : Syn_Src)
return Value_Acc;
-- If VAL is a const, replace it by its value.
procedure Strip_Const (Val : in out Value_Acc);
function Strip_Const (Val : Value_Acc) return Value_Acc;
function Unshare (Src : Value_Acc; Pool : Areapool_Acc)
return Value_Acc;
-- Get the number of indexes in array type TYP without counting
-- sub-elements.
function Get_Array_Flat_Length (Typ : Type_Acc) return Width;
-- Return length of dimension DIM of type T.
function Get_Bound_Length (T : Type_Acc; Dim : Iir_Index32) return Width;
function Is_Matching_Bounds (L, R : Type_Acc) return Boolean;
function Get_Type_Width (Atype : Type_Acc) return Width;
-- Create a default initial value for TYP.
function Create_Value_Default (Typ : Type_Acc) return Value_Acc;
procedure Init;
-- Set by Init.
Boolean_Type : Type_Acc := null;
Logic_Type : Type_Acc := null;
Bit_Type : Type_Acc := null;
end Synth.Values;
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