Annotation of gforth/kernel/vars.fs, revision 1.10
1.1 anton 1: \ VARS.FS Kernal variables
2:
1.6 anton 3: \ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
1.1 anton 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)
1.10 ! crook 28: -1 Constant true ( -- f ) \ core-ext
! 29: \G CONSTANT: f is a cell with all bits set.
! 30: \ see starts looking for primitives after this word!
! 31:
! 32: 0 Constant false ( -- f ) \ core-ext
! 33: \G CONSTANT: f is a cell with all bits clear.
1.1 anton 34:
35: 1 cells Constant cell ( -- u ) \ gforth
36: 1 floats Constant float ( -- u ) \ gforth
37:
1.10 ! crook 38: 20 Constant bl ( -- c-char ) \ core
! 39: \G c-char is the character value for a space.
! 40: \ used by docon:, must be constant
1.1 anton 41:
42: FF Constant /line
43:
44: 40 Constant c/l
45: 10 Constant l/s
46: 400 Constant chars/block
47:
1.2 anton 48: $20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
49: 84 constant pad-minsize ( -- u )
50:
1.1 anton 51: \ that's enough so long
52:
53: \ User variables 13feb93py
54:
55: \ initialized by COLD
56:
1.7 pazsan 57: Create main-task has? OS [IF] 100 [ELSE] 40 [THEN] cells allot
1.3 jwilke 58:
59: \ set user-pointer from cross-compiler right
60: main-task
61: UNLOCK tup ! LOCK
1.1 anton 62:
1.8 anton 63: Variable udp \ user area size? -anton
1.1 anton 64:
65: AUser next-task main-task next-task !
66: AUser prev-task main-task prev-task !
67: AUser save-task 0 save-task !
1.10 ! crook 68: AUser sp0 ( -- a-addr ) \ gforth
! 69: \G USER VARIABLE: Initial value of the data stack pointer.
! 70: \ sp0 is used by douser:, must be user
! 71: ' sp0 Alias s0 ( -- a-addr ) \ gforth
! 72: \G OBSOLETE alias of @code{sp0}
! 73:
! 74: AUser rp0 ( -- a-addr ) \ gforth
! 75: \G USER VARIABLE: Initial value of the return stack pointer.
! 76: ' rp0 Alias r0 ( -- a-addr ) \ gforth
! 77: \G OBSOLETE alias of @code{rp0}
! 78:
! 79: AUser fp0 ( -- a-addr ) \ gforth
! 80: \G USER VARIABLE: Initial value of the floating-point stack pointer.
! 81: \ no f0, because this leads to unexpected results when using hex
! 82:
! 83: AUser lp0 ( -- a-addr ) \ gforth
! 84: \G USER VARIABLE: Initial value of the locals stack pointer.
! 85: ' lp0 Alias l0 ( -- a-addr ) \ gforth
! 86: \G OBSOLETE alias of @code{lp0}
! 87:
1.3 jwilke 88: AUser handler \ pointer to last throw frame
1.9 anton 89: AUser backtrace-empty \ true if the next THROW should store a backtrace
1.1 anton 90: \ AUser output
91: \ AUser input
92:
93: AUser errorhandler
94:
95: AUser "error 0 "error !
96:
1.3 jwilke 97: [IFUNDEF] #tib \ in ec-Version we may define this ourself
98: User tibstack \ saves >tib in execute
99: User >tib \ pointer to terminal input buffer
1.10 ! crook 100: User #tib ( -- a-addr ) \ core-ext
! 101: \G USER VARIABLE: a-addr is the address of a cell containing
! 102: \G the number of characters in the terminal input buffer.
! 103: \G OBSOLESCENT: @code{source} superceeds the function of this word.
! 104:
! 105: User >in ( -- a-addr ) \ core
! 106: \G USER VARIABLE: a-addr is the address of a cell containing the
! 107: \G char offset from the start of the terminal input buffer to the
! 108: \G start of the parse area
! 109: 0 >in ! \ char number currently processed in tib
1.3 jwilke 110: [THEN]
1.7 pazsan 111: has? file [IF]
1.10 ! crook 112: User blk ( -- a-addr ) \ block
! 113: \G USER VARIABLE: a-addr is the address of a cell containing zero
! 114: \G (in which case the input source is not a block and can be identified
! 115: \G by @code{source-id}) or the number of the block currently being
! 116: \G interpreted. A Standard program should not alter @code{blk} directly.
! 117: 0 blk !
! 118:
1.1 anton 119: User loadfile 0 loadfile !
120:
121: User loadfilename# 0 loadfilename# !
122:
123: User loadline \ number of the currently interpreted
124: \ (in TIB) line if the interpretation
125: \ is in a textfile
126: \ the first line is 1
127:
128: 2User linestart \ starting file postition of
129: \ the current interpreted line (in TIB)
1.7 pazsan 130: [THEN]
1.1 anton 131:
1.10 ! crook 132: User base ( -- a-addr ) \ core
! 133: \G USER VARIABLE: a-addr is the address of a cell that stores the
! 134: \G number base used by default for number conversion during input and output.
! 135: A base !
1.1 anton 136: User dpl -1 dpl !
137:
1.10 ! crook 138: User state ( -- a-addr ) \ core,tools-ext
! 139: \G USER VARIABLE: a-addr is the address of a cell containing
! 140: \G the compilation state flag. 0 => interpreting, -1 => compiling.
! 141: \G A program shall not directly alter the value of @code{state}. The
! 142: \G following Standard words alter the value in @code{state}:
! 143: \G @code{:} (colon) @code{;} (semicolon) @code{abort} @code{quit}
! 144: \G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket)
! 145: \G @code{;code}
! 146: 0 state !
! 147:
1.1 anton 148: AUser normal-dp \ the usual dictionary pointer
149: AUser dpp normal-dp dpp !
150: \ the pointer to the current dictionary pointer
151: \ ist reset to normal-dp on (doerror)
152: \ (i.e. any throw caught by quit)
153: AUser LastCFA
154: AUser Last
155:
1.7 pazsan 156: has? glocals [IF]
1.1 anton 157: User locals-size \ this is the current size of the locals stack
158: \ frame of the current word
1.7 pazsan 159: [THEN]
1.1 anton 160:
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