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Annotation of gforth/kernel/vars.fs, revision 1.2

1.1       anton       1: \ VARS.FS      Kernal variables
                      2: 
                      3: \ Copyright (C) 1995 Free Software Foundation, Inc.
                      4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
                      9: \ as published by the Free Software Foundation; either version 2
                     10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
                     18: \ along with this program; if not, write to the Free Software
                     19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
                     20: 
                     21: hex \ everything now hex!                               11may93jaw
                     22: 
                     23: \ important constants                                  17dec92py
                     24: 
                     25: \ dpANS6 (sect 3.1.3.1) says 
                     26: \ "a true flag ... [is] a single-cell value with all bits set"
                     27: \ better definition: 0 0= constant true ( no dependence on 2's compl)
                     28:  -1 Constant true               \ see starts looking for
                     29:                                 \ primitives after this word!
                     30:   0 Constant false
                     31: 
                     32: 1 cells Constant cell ( -- u ) \ gforth
                     33: 1 floats Constant float ( -- u ) \ gforth
                     34: 
                     35: 20 Constant bl \ used by docon:, must be constant
                     36: 
                     37: FF Constant /line
                     38: 
                     39: 40 Constant c/l
                     40: 10 Constant l/s
                     41: 400 Constant chars/block
                     42: 
1.2     ! anton      43: $20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
        !            44: 84 constant pad-minsize ( -- u )
        !            45: 
1.1       anton      46: \ that's enough so long
                     47: 
                     48: \ User variables                                       13feb93py
                     49: 
                     50: \ initialized by COLD
                     51: 
                     52: Create main-task  100 cells allot
                     53: main-task tup H ! minimal
                     54: 
                     55: Variable udp \ used by dovar:, must be variable
                     56: 
                     57: AUser next-task        main-task next-task !
                     58: AUser prev-task        main-task prev-task !
                     59: AUser save-task        0 save-task !
                     60: AUser s0 \ used by douser:, must be user
                     61: AUser r0
                     62: AUser f0
                     63: AUser l0
                     64: AUser handler
                     65: \ AUser output
                     66: \ AUser input
                     67: 
                     68: AUser errorhandler
                     69: 
                     70: AUser "error            0 "error !
                     71: 
                     72:  User tibstack
                     73:  User >tib
                     74:  User #tib
                     75:  User >in               0 >in !
                     76:  User blk               0 blk !
                     77:  User loadfile          0 loadfile !
                     78: 
                     79:  User loadfilename#    0 loadfilename# !
                     80: 
                     81:  User loadline          \ number of the currently interpreted
                     82:                         \ (in TIB) line if the interpretation
                     83:                         \ is in a textfile
                     84:                         \ the first line is 1
                     85: 
                     86: 2User linestart         \ starting file postition of
                     87:                         \ the current interpreted line (in TIB)
                     88: 
                     89:  User base              A base !
                     90:  User dpl               -1 dpl !
                     91: 
                     92:  User state             0 state !
                     93: AUser normal-dp                \ the usual dictionary pointer
                     94: AUser dpp              normal-dp dpp !
                     95:                        \ the pointer to the current dictionary pointer
                     96:                         \ ist reset to normal-dp on (doerror)
                     97:                         \  (i.e. any throw caught by quit)
                     98: AUser LastCFA
                     99: AUser Last
                    100: 
                    101: User locals-size \ this is the current size of the locals stack
                    102:                 \ frame of the current word
                    103: 
                    104: