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-- GHDL Run Time (GRT) - processes.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- GHDL 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, or (at your option) any later
-- version.
--
-- GHDL 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 GCC; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with System;
with Grt.Stack2; use Grt.Stack2;
with Grt.Types; use Grt.Types;
with Grt.Signals; use Grt.Signals;
with Grt.Stacks; use Grt.Stacks;
with Grt.Rtis; use Grt.Rtis;
with Grt.Rtis_Addr;
with Grt.Stdio;
package Grt.Processes is
pragma Suppress (All_Checks);
-- Internal initialisations.
procedure Init;
-- Do the VHDL simulation.
-- Return 0 in case of success (end of time reached).
function Simulation return Integer;
-- Number of delta cycles.
Nbr_Delta_Cycles : Integer;
-- Number of non-delta cycles.
Nbr_Cycles : Integer;
-- If true, the simulation should be stopped.
Break_Simulation : Boolean;
type Process_Type is private;
-- type Process_Acc is access all Process_Type;
-- Return the identifier of the current process.
-- During the elaboration, this is the identifier of the last process
-- being elaborated. So, this function can be used to create signal
-- drivers.
-- Return the total number of processes and number of sensitized processes.
-- Used for statistics.
function Get_Nbr_Processes return Natural;
function Get_Nbr_Sensitized_Processes return Natural;
-- Total number of resumed processes.
function Get_Nbr_Resumed_Processes return Natural;
-- Disp the name of process PROC.
procedure Disp_Process_Name (Stream : Grt.Stdio.FILEs; Proc : Process_Acc);
-- Register a process during elaboration.
-- This procedure is called by vhdl elaboration code.
procedure Ghdl_Process_Register (Instance : Instance_Acc;
Proc : Proc_Acc;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Sensitized_Process_Register (Instance : Instance_Acc;
Proc : Proc_Acc;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Postponed_Process_Register (Instance : Instance_Acc;
Proc : Proc_Acc;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
procedure Ghdl_Postponed_Sensitized_Process_Register
(Instance : Instance_Acc;
Proc : Proc_Acc;
Ctxt : Ghdl_Rti_Access;
Addr : System.Address);
-- For verilog processes.
procedure Ghdl_Finalize_Register (Instance : Instance_Acc;
Proc : Proc_Acc);
procedure Ghdl_Initial_Register (Instance : Instance_Acc;
Proc : Proc_Acc);
procedure Ghdl_Always_Register (Instance : Instance_Acc;
Proc : Proc_Acc);
-- Add a simple signal in the sensitivity of the last registered
-- (sensitized) process.
procedure Ghdl_Process_Add_Sensitivity (Sig : Ghdl_Signal_Ptr);
-- Resume a process.
procedure Resume_Process (Proc : Process_Acc);
-- Wait without timeout or sensitivity.
procedure Ghdl_Process_Wait_Exit;
-- Wait for a timeout.
procedure Ghdl_Process_Wait_Timeout (Time : Std_Time);
-- Add a sensitivity for a wait.
procedure Ghdl_Process_Wait_Add_Sensitivity (Sig : Ghdl_Signal_Ptr);
-- Add a timeout for a wait.
procedure Ghdl_Process_Wait_Set_Timeout (Time : Std_Time);
-- Wait until timeout or sensitivity.
-- Return TRUE in case of timeout.
function Ghdl_Process_Wait_Suspend return Boolean;
-- Finish a wait statement.
procedure Ghdl_Process_Wait_Close;
-- Verilog.
procedure Ghdl_Process_Delay (Del : Ghdl_U32);
-- Secondary stack.
function Ghdl_Stack2_Allocate (Size : Ghdl_Index_Type)
return System.Address;
function Ghdl_Stack2_Mark return Mark_Id;
procedure Ghdl_Stack2_Release (Mark : Mark_Id);
-- Protected variables.
procedure Ghdl_Protected_Enter (Obj : System.Address);
procedure Ghdl_Protected_Leave (Obj : System.Address);
procedure Ghdl_Protected_Init (Obj : System.Address);
procedure Ghdl_Protected_Fini (Obj : System.Address);
private
-- State of a process.
type Process_State is
(
-- Sensitized process. Its state cannot change.
State_Sensitized,
-- Non-sensitized process, ready to run.
State_Ready,
-- Verilog process, being suspended.
State_Delayed,
-- Non-sensitized process being suspended.
State_Wait,
-- Non-sensitized process being awaked by a wait timeout. This state
-- is transcient.
-- This is necessary so that the process will exit immediately from the
-- wait statements without checking if the wait condition is true.
State_Timeout,
-- Non-sensitized process waiting until end.
State_Dead);
type Process_Type is record
-- Stack for the process.
-- This must be the first field of the record (and this is the only
-- part visible).
-- Must be NULL_STACK for sensitized processes.
Stack : Stacks.Stack_Type;
-- Subprogram containing process code.
Subprg : Proc_Acc;
-- Instance (THIS parameter) for the subprogram.
This : Instance_Acc;
-- Name of the process.
Rti : Rtis_Addr.Rti_Context;
-- True if the process is resumed and will be run at next cycle.
Resumed : Boolean;
-- True if the process is postponed.
Postponed : Boolean;
State : Process_State;
-- Timeout value for wait.
Timeout : Std_Time;
-- Sensitivity list while the (non-sensitized) process is waiting.
Sensitivity : Action_List_Acc;
Timeout_Chain_Next : Process_Acc;
Timeout_Chain_Prev : Process_Acc;
end record;
pragma Export (C, Ghdl_Process_Register,
"__ghdl_process_register");
pragma Export (C, Ghdl_Sensitized_Process_Register,
"__ghdl_sensitized_process_register");
pragma Export (C, Ghdl_Postponed_Process_Register,
"__ghdl_postponed_process_register");
pragma Export (C, Ghdl_Postponed_Sensitized_Process_Register,
"__ghdl_postponed_sensitized_process_register");
pragma Export (C, Ghdl_Finalize_Register, "__ghdl_finalize_register");
pragma Export (C, Ghdl_Always_Register, "__ghdl_always_register");
pragma Export (C, Ghdl_Initial_Register, "__ghdl_initial_register");
pragma Export (C, Ghdl_Process_Add_Sensitivity,
"__ghdl_process_add_sensitivity");
pragma Export (C, Ghdl_Process_Wait_Exit,
"__ghdl_process_wait_exit");
pragma Export (C, Ghdl_Process_Wait_Timeout,
"__ghdl_process_wait_timeout");
pragma Export (C, Ghdl_Process_Wait_Add_Sensitivity,
"__ghdl_process_wait_add_sensitivity");
pragma Export (C, Ghdl_Process_Wait_Set_Timeout,
"__ghdl_process_wait_set_timeout");
pragma Export (Ada, Ghdl_Process_Wait_Suspend,
"__ghdl_process_wait_suspend");
pragma Export (C, Ghdl_Process_Wait_Close,
"__ghdl_process_wait_close");
pragma Export (C, Ghdl_Process_Delay, "__ghdl_process_delay");
pragma Export (C, Ghdl_Stack2_Allocate, "__ghdl_stack2_allocate");
pragma Export (C, Ghdl_Stack2_Mark, "__ghdl_stack2_mark");
pragma Export (C, Ghdl_Stack2_Release, "__ghdl_stack2_release");
pragma Export (C, Ghdl_Protected_Enter, "__ghdl_protected_enter");
pragma Export (C, Ghdl_Protected_Leave, "__ghdl_protected_leave");
pragma Export (C, Ghdl_Protected_Init, "__ghdl_protected_init");
pragma Export (C, Ghdl_Protected_Fini, "__ghdl_protected_fini");
end Grt.Processes;
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