version 1.4, 1997/07/06 15:56:17
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version 1.14, 1999/03/23 20:24:27
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\ VARS.FS Kernal variables |
\ VARS.FS Kernal variables |
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\ Copyright (C) 1995 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 25 hex \ everything now hex!
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Line 25 hex \ everything now hex!
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\ dpANS6 (sect 3.1.3.1) says |
\ dpANS6 (sect 3.1.3.1) says |
\ "a true flag ... [is] a single-cell value with all bits set" |
\ "a true flag ... [is] a single-cell value with all bits set" |
\ better definition: 0 0= constant true ( no dependence on 2's compl) |
\ better definition: 0 0= constant true ( no dependence on 2's compl) |
-1 Constant true \ see starts looking for |
-1 Constant true ( -- f ) \ core-ext |
\ primitives after this word! |
\G CONSTANT: @var{f} is a cell with all bits set. |
0 Constant false |
\ see starts looking for primitives after this word! |
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0 Constant false ( -- f ) \ core-ext |
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\G CONSTANT: @var{f} is a cell with all bits clear. |
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1 cells Constant cell ( -- u ) \ gforth |
1 cells Constant cell ( -- u ) \ gforth |
1 floats Constant float ( -- u ) \ gforth |
1 floats Constant float ( -- u ) \ gforth |
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20 Constant bl \ used by docon:, must be constant |
20 Constant bl ( -- c-char ) \ core |
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\G @var{c-char} is the character value for a space. |
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\ used by docon:, must be constant |
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FF Constant /line |
FF Constant /line |
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Line 41 FF Constant /line
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Line 46 FF Constant /line
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400 Constant chars/block |
400 Constant chars/block |
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$20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u ) |
$20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u ) |
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create holdbuf word-pno-size chars allot |
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holdbuf word-pno-size chars + aconstant holdbuf-end |
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avariable holdptr holdbuf-end holdptr a! |
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avariable holdend holdbuf-end holdend a! |
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84 constant pad-minsize ( -- u ) |
84 constant pad-minsize ( -- u ) |
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\ that's enough so long |
\ that's enough so long |
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\ User variables 13feb93py |
\ User variables 13feb93py |
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\ initialized by COLD |
\ initialized by COLD |
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Create main-task 100 cells allot |
Create main-task has? OS [IF] 100 [ELSE] 40 [THEN] cells allot |
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\ set user-pointer from cross-compiler right |
\ set user-pointer from cross-compiler right |
main-task |
main-task |
UNLOCK tup ! LOCK |
UNLOCK tup ! LOCK |
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Variable udp |
Variable udp \ user area size? -anton |
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AUser next-task main-task next-task ! |
AUser next-task main-task next-task ! |
AUser prev-task main-task prev-task ! |
AUser prev-task main-task prev-task ! |
AUser save-task 0 save-task ! |
AUser save-task 0 save-task ! |
AUser sp0 \ used by douser:, must be user |
AUser sp0 ( -- a-addr ) \ gforth |
' sp0 Alias s0 |
\G USER VARIABLE: Initial value of the data stack pointer. |
AUser rp0 ' rp0 Alias r0 |
\ sp0 is used by douser:, must be user |
AUser fp0 ' fp0 Alias f0 |
' sp0 Alias s0 ( -- a-addr ) \ gforth |
AUser lp0 ' lp0 Alias l0 |
\G OBSOLETE alias of @code{sp0} |
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AUser rp0 ( -- a-addr ) \ gforth |
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\G USER VARIABLE: Initial value of the return stack pointer. |
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' rp0 Alias r0 ( -- a-addr ) \ gforth |
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\G OBSOLETE alias of @code{rp0} |
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AUser fp0 ( -- a-addr ) \ gforth |
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\G USER VARIABLE: Initial value of the floating-point stack pointer. |
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\ no f0, because this leads to unexpected results when using hex |
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AUser lp0 ( -- a-addr ) \ gforth |
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\G USER VARIABLE: Initial value of the locals stack pointer. |
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' lp0 Alias l0 ( -- a-addr ) \ gforth |
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\G OBSOLETE alias of @code{lp0} |
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AUser handler \ pointer to last throw frame |
AUser handler \ pointer to last throw frame |
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User backtrace-empty \ true if the next THROW should store a backtrace |
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AUser backtrace-rp0 \ rp at last call of interpret |
\ AUser output |
\ AUser output |
\ AUser input |
\ AUser input |
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Line 76 AUser "error 0 "error !
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Line 104 AUser "error 0 "error !
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[IFUNDEF] #tib \ in ec-Version we may define this ourself |
[IFUNDEF] #tib \ in ec-Version we may define this ourself |
User tibstack \ saves >tib in execute |
User tibstack \ saves >tib in execute |
User >tib \ pointer to terminal input buffer |
User >tib \ pointer to terminal input buffer |
User #tib \ chars in terminal input buffer |
User #tib ( -- a-addr ) \ core-ext |
User >in 0 >in ! \ char number currently processed in tib |
\G USER VARIABLE: @var{a-addr} is the address of a cell containing |
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\G the number of characters in the terminal input buffer. |
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\G OBSOLESCENT: @code{source} superceeds the function of this word. |
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User >in ( -- a-addr ) \ core |
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\G USER VARIABLE: @var{a-addr} is the address of a cell containing the |
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\G char offset from the start of the terminal input buffer to the |
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\G start of the parse area |
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0 >in ! \ char number currently processed in tib |
[THEN] |
[THEN] |
User blk 0 blk ! |
has? file [IF] |
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User blk ( -- a-addr ) \ block |
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\G USER VARIABLE: @var{a-addr} is the address of a cell containing zero |
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\G (in which case the input source is not a block and can be identified |
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\G by @code{source-id}) or the number of the block currently being |
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\G interpreted. A Standard program should not alter @code{blk} directly. |
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0 blk ! |
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User loadfile 0 loadfile ! |
User loadfile 0 loadfile ! |
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User loadfilename# 0 loadfilename# ! |
User loadfilename# 0 loadfilename# ! |
Line 91 AUser "error 0 "error !
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Line 134 AUser "error 0 "error !
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2User linestart \ starting file postition of |
2User linestart \ starting file postition of |
\ the current interpreted line (in TIB) |
\ the current interpreted line (in TIB) |
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[THEN] |
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User base A base ! |
User base ( -- a-addr ) \ core |
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\G USER VARIABLE: @var{a-addr} is the address of a cell that stores the |
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\G number base used by default for number conversion during input and output. |
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A base ! |
User dpl -1 dpl ! |
User dpl -1 dpl ! |
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User state 0 state ! |
User state ( -- a-addr ) \ core,tools-ext |
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\G Recommended reading: @cite{@code{State}-smartness--Why it is evil |
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\G and how to exorcise it}, |
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\G @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
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\G version: Don't use @code{state}! @xref{Interpretation and |
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\G Compilation Semantics} for an alternative. USER VARIABLE: @var{a-addr} |
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\G is the address of a cell containing the compilation state flag. 0 |
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\G => interpreting, -1 => compiling. A program shall not directly |
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\G alter the value of @code{state}. The following Standard words |
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\G alter the value in @code{state}: @code{:} (colon) @code{;} |
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\G (semicolon) @code{abort} @code{quit} @code{:noname} @code{[} |
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\G (left-bracket) @code{]} (right-bracket) @code{;code} |
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0 state ! |
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AUser normal-dp \ the usual dictionary pointer |
AUser normal-dp \ the usual dictionary pointer |
AUser dpp normal-dp dpp ! |
AUser dpp normal-dp dpp ! |
\ the pointer to the current dictionary pointer |
\ the pointer to the current dictionary pointer |
Line 104 AUser dpp normal-dp dpp !
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Line 164 AUser dpp normal-dp dpp !
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AUser LastCFA |
AUser LastCFA |
AUser Last |
AUser Last |
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has? glocals [IF] |
User locals-size \ this is the current size of the locals stack |
User locals-size \ this is the current size of the locals stack |
\ frame of the current word |
\ frame of the current word |
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[THEN] |
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