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vars.fs
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Sun Feb 21 14:55:45 1999 UTC (25 years, 1 month ago) by
anton
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gforth-ditc is now installed with "make install"
bugfix in print-backtrace
rewrote number output: now uses a fixed buffer HOLDBUF; added <<# and
#>> to deal with nested number output (e.g., AT-XY), and fixed
ud.r and d.r (and thus all the "." words) and DUMP to use
them. Other words using <# still have to be fixed.
removed COMPACT// and its use; it did not work, and anyway, it's a bad
idea for Cygwin, Domain/OS (Apollo's OS), and possibly other OSs.
\ 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
\ 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 3.1.3.1) 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 ( -- f ) \ core-ext
\G CONSTANT: f is a cell with all bits set.
\ see starts looking for primitives after this word!
0 Constant false ( -- f ) \ core-ext
\G CONSTANT: f is a cell with all bits clear.
1 cells Constant cell ( -- u ) \ gforth
1 floats Constant float ( -- u ) \ gforth
20 Constant bl ( -- c-char ) \ core
\G c-char is the character value for a space.
\ 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 )
create holdbuf word-pno-size chars allot
holdbuf word-pno-size chars + aconstant holdbuf-end
avariable holdptr holdbuf-end holdptr a!
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
main-task
UNLOCK tup ! LOCK
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 ( -- a-addr ) \ gforth
\G USER VARIABLE: Initial value of the data stack pointer.
\ sp0 is used by douser:, must be user
' sp0 Alias s0 ( -- a-addr ) \ gforth
\G OBSOLETE alias of @code{sp0}
AUser rp0 ( -- a-addr ) \ gforth
\G USER VARIABLE: Initial value of the return stack pointer.
' rp0 Alias r0 ( -- a-addr ) \ gforth
\G OBSOLETE alias of @code{rp0}
AUser fp0 ( -- a-addr ) \ gforth
\G USER VARIABLE: Initial value of the floating-point stack pointer.
\ no f0, because this leads to unexpected results when using hex
AUser lp0 ( -- a-addr ) \ gforth
\G USER VARIABLE: Initial value of the locals stack pointer.
' lp0 Alias l0 ( -- a-addr ) \ gforth
\G OBSOLETE alias of @code{lp0}
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 ( -- a-addr ) \ core-ext
\G USER VARIABLE: a-addr is the address of a cell containing
\G the number of characters in the terminal input buffer.
\G OBSOLESCENT: @code{source} superceeds the function of this word.
User >in ( -- a-addr ) \ core
\G USER VARIABLE: a-addr is the address of a cell containing the
\G char offset from the start of the terminal input buffer to the
\G start of the parse area
0 >in ! \ char number currently processed in tib
[THEN]
has? file [IF]
User blk ( -- a-addr ) \ block
\G USER VARIABLE: a-addr is the address of a cell containing zero
\G (in which case the input source is not a block and can be identified
\G by @code{source-id}) or the number of the block currently being
\G interpreted. A Standard program should not alter @code{blk} directly.
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)
[THEN]
User base ( -- a-addr ) \ core
\G USER VARIABLE: a-addr is the address of a cell that stores the
\G number base used by default for number conversion during input and output.
A base !
User dpl -1 dpl !
User state ( -- a-addr ) \ core,tools-ext
\G USER VARIABLE: a-addr is the address of a cell containing
\G the compilation state flag. 0 => interpreting, -1 => compiling.
\G A program shall not directly alter the value of @code{state}. The
\G following Standard words alter the value in @code{state}:
\G @code{:} (colon) @code{;} (semicolon) @code{abort} @code{quit}
\G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket)
\G @code{;code}
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
[THEN]
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