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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, see <gnu.org/licenses>.
with Types; use Types;
with Areapools; use Areapools;
with Grt.Types; use Grt.Types;
with Elab.Memtype; use Elab.Memtype;
with Vhdl.Nodes; use Vhdl.Nodes;
package Elab.Vhdl_Objtypes is
type Discrete_Range_Type is record
-- An integer range.
Dir : Direction_Type;
-- 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 Uns32;
function Build_Discrete_Range_Type
(L : Int64; R : Int64; Dir : Direction_Type) return Discrete_Range_Type;
type Float_Range_Type is record
Dir : Direction_Type;
Left : Fp64;
Right : Fp64;
end record;
type Bound_Type is record
Dir : Direction_Type;
Left : Int32;
Right : Int32;
Len : Uns32;
end record;
-- Offsets for a value.
type Value_Offsets is record
Net_Off : Uns32;
Mem_Off : Size_Type;
end record;
No_Value_Offsets : constant Value_Offsets := (0, 0);
function "+" (L, R : Value_Offsets) return Value_Offsets;
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_Unbounded_Record,
Type_Record,
Type_Access,
Type_File,
Type_Protected
);
subtype Type_Nets is Type_Kind range Type_Bit .. Type_Logic;
subtype Type_All_Discrete is Type_Kind range Type_Bit .. Type_Discrete;
subtype Type_Records is Type_Kind range
Type_Unbounded_Record .. Type_Record;
subtype Type_Arrays is Type_Kind range
Type_Array .. Type_Unbounded_Array;
subtype Type_Vectors is Type_Kind range
Type_Vector .. Type_Unbounded_Vector;
type Type_Type (Kind : Type_Kind);
type Type_Acc is access Type_Type;
type Rec_El_Type is record
-- Offset of the element.
Offs : Value_Offsets;
-- Type of the element.
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;
-- Power of 2 alignment.
type Palign_Type is range 0 .. 3;
-- What does the width (W) represent in Type_Type.
type Wkind_Type is
(
-- Not defined.
Wkind_Undef,
-- Number of net (or number of bits used to represent the type).
-- Valid only if the type can be synthesized.
Wkind_Net,
-- Number of scalar elements.
-- For simulation or non-synthesizable types.
Wkind_Sim
);
type Type_Type (Kind : Type_Kind) is record
-- Representation of W.
Wkind : Wkind_Type;
-- Alignment (in bytes) for this type.
Al : Palign_Type;
-- Number of bytes (when in memory) for this type.
Sz : Size_Type;
-- Number of bits (when in a net) for this type.
-- Can be zero only if the type has only 0 or 1 value (like a discrete
-- type with 1 element, a null vector, or a null array).
-- For non synthesizable types (like files or protected type), just
-- use 32.
W : Uns32;
case Kind is
when Type_Bit
| Type_Logic
| Type_Discrete =>
Drange : Discrete_Range_Type;
when Type_Float =>
Frange : Float_Range_Type;
when Type_Slice =>
Slice_El : Type_Acc;
when Type_Array
| Type_Vector =>
Abound : Bound_Type;
Alast : Boolean; -- True for the last dimension
Arr_El : Type_Acc;
when Type_Unbounded_Array
| Type_Unbounded_Vector =>
Uarr_El : Type_Acc;
Ulast : Boolean;
Uarr_Idx : Type_Acc;
when Type_Record
| Type_Unbounded_Record =>
-- The first elements is in the LSBs of the net.
Rec : Rec_El_Array_Acc;
when Type_Access =>
Acc_Acc : Type_Acc;
when Type_File =>
File_Typ : Type_Acc;
File_Signature : String_Acc;
when Type_Protected =>
null;
end case;
end record;
type Memtyp is record
Typ : Type_Acc;
Mem : Memory_Ptr;
end record;
Null_Memtyp : constant Memtyp := (null, null);
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;
Sz : Size_Type;
W : Uns32)
return Type_Acc;
function Create_Float_Type (Rng : Float_Range_Type) return Type_Acc;
function Create_Vec_Type_By_Length (Len : Uns32; 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; Idx : Type_Acc)
return Type_Acc;
function Create_Slice_Type (Len : Uns32; El_Type : Type_Acc)
return Type_Acc;
function Create_Array_Type
(Bnd : Bound_Type; Last : Boolean; El_Type : Type_Acc) return Type_Acc;
function Create_Unbounded_Array
(Idx : Type_Acc; Last : Boolean; 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) return Type_Acc;
function Create_Unbounded_Record (Els : Rec_El_Array_Acc) 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;
function Create_Protected_Type return Type_Acc;
function In_Bounds (Bnd : Bound_Type; V : Int32) return Boolean;
function In_Range (Rng : Discrete_Range_Type; V : Int64) return Boolean;
-- Index type of unbounded array or unbounded vector.
function Get_Uarray_Index (Typ : Type_Acc) return Type_Acc;
-- Return True iff ARR is the last dimension of a multidimensional array.
function Is_Last_Dimension (Arr : Type_Acc) return Boolean;
-- Return the bounds of a vector/array.
function Get_Array_Bound (Typ : Type_Acc) return Bound_Type;
-- Return the length of RNG.
function Get_Range_Length (Rng : Discrete_Range_Type) return Uns32;
-- 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;
function Are_Types_Equal (L, R : Type_Acc) return Boolean;
-- Return True iff L is within R.
-- See LRM08 5.2.1 (Scalar types) for definition of compatible.
function Is_Scalar_Subtype_Compatible (L, R : Type_Acc) return Boolean;
-- Return the length of a vector type.
function Vec_Length (Typ : Type_Acc) return Iir_Index32;
-- Get the number of indexes in array type TYP without counting
-- sub-elements.
function Get_Array_Flat_Length (Typ : Type_Acc) return Iir_Index32;
-- Return length of dimension DIM of type T.
-- function Get_Bound_Length (T : Type_Acc; Dim : Dim_Type) return Uns32;
function Get_Bound_Length (T : Type_Acc) return Uns32;
function Is_Matching_Bounds (L, R : Type_Acc) return Boolean;
function Get_Type_Width (Atype : Type_Acc) return Uns32;
-- Low-level functions
function Read_U8 (Mt : Memtyp) return Ghdl_U8;
function Read_Fp64 (Mt : Memtyp) return Fp64;
-- TYP is the type of the element.
procedure Write_Discrete (Mem : Memory_Ptr; Typ : Type_Acc; Val : Int64);
function Read_Discrete (Mem : Memory_Ptr; Typ : Type_Acc) return Int64;
function Read_Discrete (Mt : Memtyp) return Int64;
-- Memory allocation.
function Create_Memory_U8 (Val : Ghdl_U8; Vtype : Type_Acc)
return Memtyp;
function Create_Memory_Fp64 (Val : Fp64; Vtype : Type_Acc)
return Memtyp;
function Create_Memory_Discrete (Val : Int64; Vtype : Type_Acc)
return Memtyp;
-- For states.
function Create_Memory_U32 (Val : Uns32) return Memtyp;
function Alloc_Memory (Vtype : Type_Acc) return Memory_Ptr;
function Create_Memory (Vtype : Type_Acc) return Memtyp;
-- Like Create_Memory but initialize to 0. To be used only for types
-- of width 0.
function Create_Memory_Zero (Vtype : Type_Acc) return Memtyp;
function Is_Equal (L, R : Memtyp) return Boolean;
procedure Copy_Memory (Dest : Memory_Ptr; Src : Memory_Ptr; Sz : Size_Type);
function Unshare (Src : Memtyp) return Memtyp;
function Unshare (Src : Memtyp; Pool : Areapool_Acc) return Memtyp;
procedure Initialize;
procedure Finalize;
-- Set by Initialize.
Boolean_Type : Type_Acc := null;
Logic_Type : Type_Acc := null;
Bit_Type : Type_Acc := null;
Protected_Type : Type_Acc := null;
-- Also set by initialize.
Bit0 : Memtyp;
Bit1 : Memtyp;
end Elab.Vhdl_Objtypes;
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