\ VARS.FS Kernal variables
\ Copyright (C) 1995 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth 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., 675 Mass Ave, Cambridge, MA 02139, USA.
hex \ everything now hex! 11may93jaw
\ important constants 17dec92py
\ dpANS6 (sect 18.104.22.168) says
\ "a true flag ... [is] a single-cell value with all bits set"
\ better definition: 0 0= constant true ( no dependence on 2's compl)
-1 Constant true \ see starts looking for
\ primitives after this word!
0 Constant false
1 cells Constant cell
20 Constant bl \ used by docon:, must be constant
FF Constant /line
40 Constant c/l
10 Constant l/s
400 Constant chars/block
\ that's enough so long
\ User variables 13feb93py
\ doesn't produce real user variables now, but normal variables
Create main-task 100 cells allot
main-task tup H ! minimal
Variable udp \ used by dovar:, must be variable
AUser next-task main-task next-task !
AUser prev-task main-task prev-task !
AUser save-task 0 save-task !
AUser s0 \ used by douser:, must be user
\ AUser output
\ AUser input
AUser "error 0 "error !
User >in 0 >in !
User blk 0 blk !
User loadfile 0 loadfile !
\ 2User loadfilename 0 0 loadfilename 2!
\ here ," the terminal" align here swap count 2, Value loadfilename
\ align here 0 , 0 , Value loadfilename \ !! should be a `user-value'
User loadfilename# 0 loadfilename# !
User loadline \ number of the currently interpreted
\ (in TIB) line if the interpretation
\ is in a textfile
\ the first line is 1
2User linestart \ starting file postition of
\ the current interpreted line (in TIB)
User base A base !
User dpl -1 dpl !
User state 0 state !
AUser normal-dp \ the usual dictionary pointer
AUser dpp normal-dp dpp !
\ the pointer to the current dictionary pointer
\ ist reset to normal-dp on (doerror)
\ (i.e. any throw caught by quit)
User locals-size \ this is the current size of the locals stack
\ frame of the current word