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[gforth] /
gforth /
kernel /
vars.fs
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Sun Jan 3 21:48:39 1999 UTC (25 years, 3 months ago) by
anton
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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
1: \ VARS.FS Kernal variables
2:
3: \ Copyright (C) 1995,1996,1997,1998 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 has? OS [IF] 100 [ELSE] 40 [THEN] cells allot
53:
54: \ set user-pointer from cross-compiler right
55: main-task
56: UNLOCK tup ! LOCK
57:
58: Variable udp \ user area size? -anton
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 \ no f0, because this leads to unexpected results
67: AUser lp0 ' lp0 Alias l0
68: AUser handler \ pointer to last throw frame
69: AUser backtrace-empty \ true if the next THROW should store a backtrace
70: \ AUser output
71: \ AUser input
72:
73: AUser errorhandler
74:
75: AUser "error 0 "error !
76:
77: [IFUNDEF] #tib \ in ec-Version we may define this ourself
78: User tibstack \ saves >tib in execute
79: User >tib \ pointer to terminal input buffer
80: User #tib \ chars in terminal input buffer
81: User >in 0 >in ! \ char number currently processed in tib
82: [THEN]
83: has? file [IF]
84: User blk 0 blk !
85: User loadfile 0 loadfile !
86:
87: User loadfilename# 0 loadfilename# !
88:
89: User loadline \ number of the currently interpreted
90: \ (in TIB) line if the interpretation
91: \ is in a textfile
92: \ the first line is 1
93:
94: 2User linestart \ starting file postition of
95: \ the current interpreted line (in TIB)
96: [THEN]
97:
98: User base A base !
99: User dpl -1 dpl !
100:
101: User state 0 state !
102: AUser normal-dp \ the usual dictionary pointer
103: AUser dpp normal-dp dpp !
104: \ the pointer to the current dictionary pointer
105: \ ist reset to normal-dp on (doerror)
106: \ (i.e. any throw caught by quit)
107: AUser LastCFA
108: AUser Last
109:
110: has? glocals [IF]
111: User locals-size \ this is the current size of the locals stack
112: \ frame of the current word
113: [THEN]
114:
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