version 1.2, 1997/06/06 17:28:17
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version 1.35, 2003/05/11 17:17:14
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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) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program; if not, write to the Free Software |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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hex \ everything now hex! 11may93jaw |
hex \ everything now hex! 11may93jaw |
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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 @code{Constant} -- @i{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 @code{Constant} -- @i{f} is a cell with all bits clear. |
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[IFUNDEF] cell |
1 cells Constant cell ( -- u ) \ gforth |
1 cells Constant cell ( -- u ) \ gforth |
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\G @code{Constant} -- @code{1 cells} |
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[THEN] |
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has? floating [IF] |
1 floats Constant float ( -- u ) \ gforth |
1 floats Constant float ( -- u ) \ gforth |
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\G @code{Constant} -- the number of address units corresponding to a floating-point number. |
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[THEN] |
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20 Constant bl \ used by docon:, must be constant |
20 Constant bl ( -- c-char ) \ core b-l |
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\G @i{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 40 FF Constant /line
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Line 52 FF Constant /line
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10 Constant l/s |
10 Constant l/s |
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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$400 Value def#tib |
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\G default size of terminal input buffer. Default size is 1K |
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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 dup allot |
main-task tup H ! minimal |
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Variable udp \ used by dovar:, must be variable |
\ set user-pointer from cross-compiler right |
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main-task |
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UNLOCK swap region user-region user-region setup-region LOCK |
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Variable udp ( -- a-addr ) \ gforth |
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\G user area size |
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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 s0 \ used by douser:, must be user |
AUser sp0 ( -- a-addr ) \ gforth |
AUser r0 |
\G @code{User} variable -- initial value of the data stack pointer. |
AUser f0 |
\ sp0 is used by douser:, must be user |
AUser l0 |
' sp0 Alias s0 ( -- a-addr ) \ gforth |
AUser handler |
\G OBSOLETE alias of @code{sp0} |
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AUser rp0 ( -- a-addr ) \ gforth |
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\G @code{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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has? floating [IF] |
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AUser fp0 ( -- a-addr ) \ gforth |
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\G @code{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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[THEN] |
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has? glocals [IF] |
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AUser lp0 ( -- a-addr ) \ gforth |
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\G @code{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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[THEN] |
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AUser handler \ pointer to last throw frame |
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has? backtrace [IF] |
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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 |
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[THEN] |
\ AUser output |
\ AUser output |
\ AUser input |
\ AUser input |
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Line 69 AUser errorhandler
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Line 117 AUser errorhandler
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AUser "error 0 "error ! |
AUser "error 0 "error ! |
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User tibstack |
has? new-input [IF] |
User >tib |
User current-input |
User #tib |
[ELSE] |
User >in 0 >in ! |
[IFUNDEF] #tib \ in ec-Version we may define this ourself |
User blk 0 blk ! |
User tibstack \ saves >tib in execute |
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User >tib \ pointer to terminal input buffer |
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User #tib ( -- a-addr ) \ core-ext number-t-i-b |
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\G @code{User} variable -- @i{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 to-in |
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\G @code{User} variable -- @i{a-addr} is the address of a cell containing the |
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\G char offset from the start of the input buffer to the start of the |
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\G parse area. |
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0 >in ! \ char number currently processed in tib |
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[THEN] |
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has? file [IF] |
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User blk ( -- a-addr ) \ block b-l-k |
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\G @code{User} variable -- @i{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# ! |
2user loadfilename 0 0 loadfilename 2! \ addr u for sourcefilename |
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User loadline \ number of the currently interpreted |
User loadline \ number of the currently interpreted |
\ (in TIB) line if the interpretation |
\ (in TIB) line if the interpretation |
Line 85 AUser "error 0 "error !
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Line 154 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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[THEN] |
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User base A base ! |
User base ( -- a-addr ) \ core |
User dpl -1 dpl ! |
\G @code{User} variable -- @i{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 ! |
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User dpl ( -- a-addr ) \ gforth |
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\G @code{User} variable -- @i{a-addr} is the address of a cell that stores the |
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\G position of the decimal point in the most recent numeric conversion. |
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\G Initialised to -1. After the conversion of a number containing no |
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\G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds |
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\G 0. After the conversion of 234123.9 it contains 1, and so forth. |
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-1 dpl ! |
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User state ( -- a-addr ) \ core,tools-ext |
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\G @code{User} variable -- @i{a-addr} is the address of a cell |
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\G containing the compilation state flag. 0 => interpreting, -1 => |
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\G compiling. A program shall not directly alter the value of |
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\G @code{state}. The following Standard words alter the value in |
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\G @code{state}: @code{:} (colon) @code{;} (semicolon) @code{abort} |
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\G @code{quit} @code{:noname} @code{[} (left-bracket) @code{]} |
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\G (right-bracket) @code{;code}. Don't use @code{state}! For an |
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\G alternative see @ref{Interpretation and Compilation Semantics}. |
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\ Recommended reading: @cite{@code{State}-smartness--Why it is evil |
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\ and how to exorcise it}, |
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\ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
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\ version: Don't use @code{state}! |
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0 state ! |
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User state 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 98 AUser dpp normal-dp dpp !
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Line 192 AUser dpp normal-dp dpp !
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AUser LastCFA |
AUser LastCFA |
AUser Last |
AUser Last |
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AUser last-compiled \ last compile,d xt |
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\ 0 if last xt was dyn-compiled already (basic-block-end) |
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0 last-compiled ! |
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AUser last-compiled-here \ where LAST-COMPILED should be stored |
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User max-name-length \ maximum length of all names defined yet |
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32 max-name-length ! |
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\ has? peephole [IF] |
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\ 0 value peeptable \ initialized in boot |
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\ [THEN] |
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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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