File:  [gforth] / gforth / kernel / vars.fs
Revision 1.3: download - view: text, annotated - select for diffs
Sun Jul 6 13:40:50 1997 UTC (24 years, 1 month ago) by jwilke
Branches: MAIN
CVS tags: HEAD
Changed r0 to rp0 and so on. Everyone should use the new names.
r0, s0, f0, l0 will be kept as aliases for a while.

Jens

    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: 
   43: $20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
   44: 84 constant pad-minsize ( -- u )
   45: 
   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: 
   54: \ set user-pointer from cross-compiler right
   55: main-task 
   56: UNLOCK tup ! LOCK
   57: 
   58: Variable udp \ used by dovar:, must be variable
   59: 
   60: AUser next-task        main-task next-task !
   61: AUser prev-task        main-task prev-task !
   62: AUser save-task        0 save-task !
   63: AUser sp0 	\ used by douser:, must be user
   64: 		' sp0 Alias s0
   65: AUser rp0	' rp0 Alias r0
   66: AUser fp0	' fp0 Alias f0
   67: AUser lp0	' lp0 Alias l0
   68: AUser handler	\ pointer to last throw frame
   69: \ AUser output
   70: \ AUser input
   71: 
   72: AUser errorhandler
   73: 
   74: AUser "error            0 "error !
   75: 
   76: [IFUNDEF] #tib		\ in ec-Version we may define this ourself
   77:  User tibstack		\ saves >tib in execute
   78:  User >tib		\ pointer to terminal input buffer
   79:  User #tib		\ chars in terminal input buffer
   80:  User >in               0 >in ! \ char number currently processed in tib
   81: [THEN]
   82:  User blk               0 blk !
   83:  User loadfile          0 loadfile !
   84: 
   85:  User loadfilename#	0 loadfilename# !
   86: 
   87:  User loadline          \ number of the currently interpreted
   88:                         \ (in TIB) line if the interpretation
   89:                         \ is in a textfile
   90:                         \ the first line is 1
   91: 
   92: 2User linestart         \ starting file postition of
   93:                         \ the current interpreted line (in TIB)
   94: 
   95:  User base              A base !
   96:  User dpl               -1 dpl !
   97: 
   98:  User state             0 state !
   99: AUser normal-dp		\ the usual dictionary pointer
  100: AUser dpp		normal-dp dpp !
  101: 			\ the pointer to the current dictionary pointer
  102:                         \ ist reset to normal-dp on (doerror)
  103:                         \  (i.e. any throw caught by quit)
  104: AUser LastCFA
  105: AUser Last
  106: 
  107: User locals-size \ this is the current size of the locals stack
  108: 		 \ frame of the current word
  109: 
  110: 

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