File:  [gforth] / gforth / kernel / vars.fs
Revision 1.9: download - view: text, annotated - select for diffs
Sun Jan 3 21:48:39 1999 UTC (22 years, 4 months ago) by anton
Branches: MAIN
CVS tags: HEAD
added ]L, IN-DICTIONARY? and IN-RETURN-STACK? to stuff.fs
refactored a few words to use IN-DICTIONARY?
added backtrace hooks to CATCH, THROW and (DOERROR)
added simple backtrace printing

\ VARS.FS      Kernal variables

\ Copyright (C) 1995,1996,1997,1998 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
\ 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 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 ( -- u ) \ gforth
1 floats Constant float ( -- u ) \ gforth

20 Constant bl \ used by docon:, must be constant

FF Constant /line

40 Constant c/l
10 Constant l/s
400 Constant chars/block

$20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
84 constant pad-minsize ( -- u )

\ that's enough so long

\ User variables                                       13feb93py

\ initialized by COLD

Create main-task  has? OS [IF] 100 [ELSE] 40 [THEN] cells allot

\ set user-pointer from cross-compiler right

Variable udp \ user area size? -anton

AUser next-task        main-task next-task !
AUser prev-task        main-task prev-task !
AUser save-task        0 save-task !
AUser sp0 	\ used by douser:, must be user
		' sp0 Alias s0
AUser rp0	' rp0 Alias r0
AUser fp0       \ no f0, because this leads to unexpected results
AUser lp0	' lp0 Alias l0
AUser handler	\ pointer to last throw frame
AUser backtrace-empty \ true if the next THROW should store a backtrace
\ AUser output
\ AUser input

AUser errorhandler

AUser "error            0 "error !

[IFUNDEF] #tib		\ in ec-Version we may define this ourself
 User tibstack		\ saves >tib in execute
 User >tib		\ pointer to terminal input buffer
 User #tib		\ chars in terminal input buffer
 User >in               0 >in ! \ char number currently processed in tib
has? file [IF]
 User blk               0 blk !
 User loadfile          0 loadfile !

 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)
AUser LastCFA
AUser Last

has? glocals [IF]
User locals-size \ this is the current size of the locals stack
		 \ frame of the current word

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