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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 Ada.Unchecked_Deallocation;
with Types; use Types;
with Areapools; use Areapools;
with Grt.Files_Operations;
with Vhdl.Nodes; use Vhdl.Nodes;
with Elab.Vhdl_Objtypes; use Elab.Vhdl_Objtypes;
with Elab.Memtype; use Elab.Memtype;
package Elab.Vhdl_Values is
-- 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,
Value_Signal,
-- Any kind of constant value, raw stored in memory.
Value_Memory,
Value_File,
-- 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
);
type Value_Type (Kind : Value_Kind);
type Value_Acc is access Value_Type;
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
case Kind is
when Value_Net
| Value_Wire =>
N : Uns32;
when Value_Signal =>
S : Uns32;
Init : Value_Acc;
when Value_Memory =>
Mem : Memory_Ptr;
when Value_File =>
File : File_Index;
when Value_Const =>
C_Val : Value_Acc;
C_Loc : Node;
C_Net : Uns32;
when Value_Alias =>
A_Obj : Value_Acc;
A_Typ : Type_Acc; -- The type of A_Obj.
A_Off : Value_Offsets;
end case;
end record;
-- A tuple of type and value.
type Valtyp is record
Typ : Type_Acc;
Val : Value_Acc;
end record;
No_Valtyp : constant Valtyp := (null, null);
type Valtyp_Array is array (Nat32 range <>) of Valtyp;
type Valtyp_Array_Acc is access Valtyp_Array;
procedure Free_Valtyp_Array is new Ada.Unchecked_Deallocation
(Valtyp_Array, Valtyp_Array_Acc);
-- True if VAL is static, ie contains neither nets nor wires.
function Is_Static (Val : Value_Acc) return Boolean;
function Is_Equal (L, R : Valtyp) return Boolean;
function Create_Value_Memtyp (Mt : Memtyp) return Valtyp;
-- Create a Value_Net.
function Create_Value_Net (S : Uns32) return Value_Acc;
-- Create a Value_Wire.
function Create_Value_Wire (S : Uns32) return Value_Acc;
function Create_Value_Signal (S : Uns32; Init : Value_Acc) return Value_Acc;
function Create_Value_Memory (Vtype : Type_Acc) return Valtyp;
function Create_Value_Memory (Mt : Memtyp) return Valtyp;
function Create_Value_Uns (Val : Uns64; Vtype : Type_Acc) return Valtyp;
function Create_Value_Int (Val : Int64; Vtype : Type_Acc) return Valtyp;
function Create_Value_Discrete (Val : Int64; Vtype : Type_Acc)
return Valtyp;
function Create_Value_Access (Val : Heap_Index; Acc_Typ : Type_Acc)
return Valtyp;
function Create_Value_Float (Val : Fp64; Vtype : Type_Acc) return Valtyp;
function Create_Value_File (Vtype : Type_Acc; File : File_Index)
return Valtyp;
function Create_Value_Alias
(Obj : Valtyp; Off : Value_Offsets; Typ : Type_Acc) return Valtyp;
function Create_Value_Const (Val : Valtyp; Loc : Node) return Valtyp;
-- If VAL is a const, replace it by its value.
procedure Strip_Const (Vt : in out Valtyp);
-- If VAL is a const or an alias, replace it by its value.
-- Used to extract the real data of a static value. Note that the type
-- is not correct anymore.
function Strip_Alias_Const (V : Valtyp) return Valtyp;
-- Return the memtyp of V; also strip const and aliases.
function Get_Memtyp (V : Valtyp) return Memtyp;
function Unshare (Src : Valtyp; Pool : Areapool_Acc) return Valtyp;
-- Create a default initial value for TYP.
function Create_Value_Default (Typ : Type_Acc) return Valtyp;
procedure Write_Value_Default (M : Memory_Ptr; Typ : Type_Acc);
-- Convert a value to a string. The value must be a const_array of scalar,
-- which represent characters.
function Value_To_String (Val : Valtyp) return String;
-- Memory access.
procedure Write_Discrete (Vt : Valtyp; Val : Int64);
function Read_Discrete (Vt : Valtyp) return Int64;
procedure Write_Access (Mem : Memory_Ptr; Val : Heap_Index);
function Read_Access (Mt : Memtyp) return Heap_Index;
function Read_Access (Vt : Valtyp) return Heap_Index;
function Read_Fp64 (Vt : Valtyp) return Fp64;
procedure Write_Value (Dest : Memory_Ptr; Vt : Valtyp);
procedure Update_Index (Rng : Discrete_Range_Type; V : in out Valtyp);
end Elab.Vhdl_Values;
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