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-- Statements 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 Vhdl.Nodes; use Vhdl.Nodes;
with Netlists; use Netlists;
with Synth.Objtypes; use Synth.Objtypes;
with Synth.Values; use Synth.Values;
with Synth.Context; use Synth.Context;
with Synth.Environment; use Synth.Environment;
package Synth.Stmts is
procedure Synth_Subprogram_Association (Subprg_Inst : Synth_Instance_Acc;
Caller_Inst : Synth_Instance_Acc;
Inter_Chain : Node;
Assoc_Chain : Node);
-- Dynamic index for Synth_Assignment_Prefix.
-- As dynamic is about dynamic (!) index, the index is a net.
type Dyn_Name is record
-- Start and type of the indexed part, which can be a part of the
-- base name.
Pfx_Off : Value_Offsets;
Pfx_Typ : Type_Acc;
-- Variable offset.
Voff : Net;
end record;
No_Dyn_Name : constant Dyn_Name := (Pfx_Off => No_Value_Offsets,
Pfx_Typ => null,
Voff => No_Net);
-- Transform PFX into DEST_*.
-- DEST_BASE is the base object (with its own typ). Can be the result,
-- a net or an object larger than the result.
-- DEST_TYP is the type of the result.
-- DEST_OFF is the offset, within DEST_DYN.
-- DEST_DYN is set (Voff field set) when there is a non-static index.
procedure Synth_Assignment_Prefix (Syn_Inst : Synth_Instance_Acc;
Pfx : Node;
Dest_Base : out Valtyp;
Dest_Typ : out Type_Acc;
Dest_Off : out Value_Offsets;
Dest_Dyn : out Dyn_Name);
procedure Synth_Assignment (Syn_Inst : Synth_Instance_Acc;
Target : Node;
Val : Valtyp;
Loc : Node);
function Synth_Read_Memory (Syn_Inst : Synth_Instance_Acc;
Obj : Valtyp;
Res_Typ : Type_Acc;
Off : Uns32;
Dyn : Dyn_Name;
Loc : Node) return Valtyp;
function Synth_User_Function_Call
(Syn_Inst : Synth_Instance_Acc; Expr : Node) return Valtyp;
-- Operation implemented by a user function.
function Synth_User_Operator (Syn_Inst : Synth_Instance_Acc;
Left_Expr : Node;
Right_Expr : Node;
Expr : Node) return Valtyp;
-- Generate netlists for concurrent statements STMTS.
procedure Synth_Concurrent_Statements
(Syn_Inst : Synth_Instance_Acc; Stmts : Node);
-- Apply attributes of UNIT.
procedure Synth_Attribute_Values
(Syn_Inst : Synth_Instance_Acc; Unit : Node);
procedure Synth_Verification_Unit
(Syn_Inst : Synth_Instance_Acc; Unit : Node);
-- For iterators.
procedure Update_Index (Rng : Discrete_Range_Type; V : in out Valtyp);
private
-- There are 2 execution mode:
-- * static: it is like simulation, all the inputs are known, neither
-- gates nor signals are generated. This mode is used during
-- elaboration and when all inputs of a subprogram are known.
-- * dynamic: inputs can be wires so gates are generated. But many types
-- (like file or access) cannot be handled.
type Mode_Type is (Mode_Static, Mode_Dynamic);
type Loop_Context (Mode : Mode_Type);
type Loop_Context_Acc is access all Loop_Context;
type Loop_Context (Mode : Mode_Type) is record
Prev_Loop : Loop_Context_Acc;
Loop_Stmt : Node;
case Mode is
when Mode_Dynamic =>
-- Set when this loop has next/exit statements for itself.
-- Set to true so that inner loops have to declare W_Quit.
Need_Quit : Boolean;
-- Value of W_En at the entry of the loop.
Saved_En : Net;
-- Set to 0 in case of exit for the loop.
-- Set to 0 in case of exit/next for outer loop.
-- Initialized to 1.
W_Exit : Wire_Id;
-- Set to 0 if this loop has to be quited because of an
-- exit/next for an outer loop. Initialized to 1.
W_Quit : Wire_Id;
-- Mark to release wires.
Wire_Mark : Wire_Id;
when Mode_Static =>
S_Exit : Boolean;
S_Quit : Boolean;
end case;
end record;
-- Context for sequential statements.
type Seq_Context (Mode : Mode_Type) is record
Inst : Synth_Instance_Acc;
Cur_Loop : Loop_Context_Acc;
Ret_Value : Valtyp;
Ret_Typ : Type_Acc;
Nbr_Ret : Int32;
case Mode is
when Mode_Dynamic =>
-- Enable execution. For loop controls.
W_En : Wire_Id;
W_Ret : Wire_Id;
-- Return value.
W_Val : Wire_Id;
Ret_Init : Net;
when Mode_Static =>
S_En : Boolean;
end case;
end record;
end Synth.Stmts;
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