version 1.18, 1999/05/17 14:59:00
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version 1.40, 2006/02/26 17:23:47
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\ VARS.FS Kernal variables |
\ VARS.FS Kernal variables |
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\ Copyright (C) 1995,1996,1997,1998 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 26 hex \ everything now hex!
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Line 26 hex \ everything now hex!
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\ "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 ( -- f ) \ core-ext |
-1 Constant true ( -- f ) \ core-ext |
\G CONSTANT: @i{f} is a cell with all bits set. |
\G @code{Constant} -- @i{f} is a cell with all bits set. |
\ see starts looking for primitives after this word! |
\ see starts looking for primitives after this word! |
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0 Constant false ( -- f ) \ core-ext |
0 Constant false ( -- f ) \ core-ext |
\G CONSTANT: @i{f} is a cell with all bits clear. |
\G @code{Constant} -- @i{f} is a cell with all bits clear. |
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[IFUNDEF] cell |
[IFUNDEF] cell |
1 cells Constant cell ( -- u ) \ gforth |
1 cells Constant cell ( -- u ) \ gforth |
\G CONSTANT: the number of address units corresponding to 1 cell. |
\G @code{Constant} -- @code{1 cells} |
[THEN] |
[THEN] |
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has? floating [IF] |
1 floats Constant float ( -- u ) \ gforth |
1 floats Constant float ( -- u ) \ gforth |
\G CONSTANT: the number of address units corresponding to a floating-point number. |
\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 ( -- c-char ) \ core |
20 Constant bl ( -- c-char ) \ core b-l |
\G @i{c-char} is the character value for a space. |
\G @i{c-char} is the character value for a space. |
\ used by docon:, must be constant |
\ used by docon:, must be constant |
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FF Constant /line |
FF Constant /line |
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has? file [IF] |
40 Constant c/l |
40 Constant c/l |
10 Constant l/s |
10 Constant l/s |
400 Constant chars/block |
400 Constant chars/block |
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[THEN] |
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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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has? EC 0= [IF] |
create holdbuf word-pno-size chars allot |
create holdbuf word-pno-size chars allot |
holdbuf word-pno-size chars + aconstant holdbuf-end |
holdbuf word-pno-size chars + aconstant holdbuf-end |
avariable holdptr holdbuf-end holdptr a! |
avariable holdptr holdbuf-end holdptr a! |
avariable holdend holdbuf-end holdend a! |
avariable holdend holdbuf-end holdend a! |
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[THEN] |
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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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Line 65 avariable holdend holdbuf-end holdend a!
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Line 74 avariable holdend holdbuf-end holdend a!
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\ initialized by COLD |
\ initialized by COLD |
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Create main-task has? OS [IF] 100 [ELSE] 40 [THEN] cells allot |
has? no-userspace 0= [IF] |
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Create main-task has? OS [IF] 100 [ELSE] 40 [THEN] cells dup 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 swap region user-region user-region setup-region LOCK |
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Variable udp \ user area size? -anton |
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 ! |
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[THEN] |
AUser sp0 ( -- a-addr ) \ gforth |
AUser sp0 ( -- a-addr ) \ gforth |
\G USER VARIABLE: Initial value of the data stack pointer. |
\G @code{User} variable -- initial value of the data stack pointer. |
\ sp0 is used by douser:, must be user |
\ sp0 is used by douser:, must be user |
' sp0 Alias s0 ( -- a-addr ) \ gforth |
\ ' sp0 Alias s0 ( -- a-addr ) \ gforth |
\G OBSOLETE alias of @code{sp0} |
\G OBSOLETE alias of @code{sp0} |
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AUser rp0 ( -- a-addr ) \ gforth |
AUser rp0 ( -- a-addr ) \ gforth |
\G USER VARIABLE: Initial value of the return stack pointer. |
\G @code{User} variable -- initial value of the return stack pointer. |
' rp0 Alias r0 ( -- a-addr ) \ gforth |
\ ' rp0 Alias r0 ( -- a-addr ) \ gforth |
\G OBSOLETE alias of @code{rp0} |
\G OBSOLETE alias of @code{rp0} |
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has? floating [IF] |
AUser fp0 ( -- a-addr ) \ gforth |
AUser fp0 ( -- a-addr ) \ gforth |
\G USER VARIABLE: Initial value of the floating-point stack pointer. |
\G @code{User} variable -- initial value of the floating-point stack pointer. |
\ no f0, because this leads to unexpected results when using hex |
\ no f0, because this leads to unexpected results when using hex |
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[THEN] |
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has? glocals [IF] |
AUser lp0 ( -- a-addr ) \ gforth |
AUser lp0 ( -- a-addr ) \ gforth |
\G USER VARIABLE: Initial value of the locals stack pointer. |
\G @code{User} variable -- initial value of the locals stack pointer. |
' lp0 Alias l0 ( -- a-addr ) \ gforth |
\ ' lp0 Alias l0 ( -- a-addr ) \ gforth |
\G OBSOLETE alias of @code{lp0} |
\G OBSOLETE alias of @code{lp0} |
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[THEN] |
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AUser handler \ pointer to last throw frame |
AUser handler \ pointer to last throw frame |
has? backtrace [IF] |
has? backtrace [IF] |
Line 108 AUser errorhandler
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Line 124 AUser errorhandler
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AUser "error 0 "error ! |
AUser "error 0 "error ! |
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[IFUNDEF] #tib \ in ec-Version we may define this ourself |
has? new-input [IF] |
User tibstack \ saves >tib in execute |
User current-input |
User >tib \ pointer to terminal input buffer |
[ELSE] |
User #tib ( -- a-addr ) \ core-ext |
[IFUNDEF] #tib \ in ec-Version we may define this ourself |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing |
User tibstack \ saves >tib in execute |
\G the number of characters in the terminal input buffer. |
User >tib \ pointer to terminal input buffer |
\G OBSOLESCENT: @code{source} superceeds the function of this word. |
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 |
User >in ( -- a-addr ) \ core |
\G the number of characters in the terminal input buffer. |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing the |
\G OBSOLESCENT: @code{source} superceeds the function of this word. |
\G char offset from the start of the input buffer to the start of the |
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\G parse area. |
User >in ( -- a-addr ) \ core to-in |
0 >in ! \ char number currently processed in tib |
\G @code{User} variable -- @i{a-addr} is the address of a cell containing the |
[THEN] |
\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] |
has? file [IF] |
User blk ( -- a-addr ) \ block |
User blk ( -- a-addr ) \ block b-l-k |
\G USER VARIABLE: @i{a-addr} is the address of a cell containing zero |
\G @code{User} variable -- @i{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 (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 by @code{source-id}) or the number of the block currently being |
\G interpreted. A Standard program should not alter @code{blk} directly. |
\G interpreted. A Standard program should not alter @code{blk} directly. |
Line 132 has? file [IF]
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Line 152 has? file [IF]
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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 |
\ is in a textfile |
\ is in a textfile |
Line 142 has? file [IF]
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Line 162 has? file [IF]
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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) |
[THEN] |
[THEN] |
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[THEN] |
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2user includefilename 0 0 includefilename 2! \ innermost included file |
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User base ( -- a-addr ) \ core |
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\G USER VARIABLE: @i{a-addr} is the address of a cell that stores the |
User base ( -- a-addr ) \ core |
\G number base used by default for number conversion during input and output. |
\G @code{User} variable -- @i{a-addr} is the address of a cell that stores the |
A base ! |
\G number base used by default for number conversion during input and output. |
User dpl ( -- a-addr ) \ gforth |
A base ! |
\G USER VARIABLE: @i{a-addr} is the address of a cell that stores the |
User dpl ( -- a-addr ) \ gforth |
\G position of the decimal point in the most recent numeric conversion. |
\G @code{User} variable -- @i{a-addr} is the address of a cell that stores the |
\G Initialised to -1. After the conversion of a number containing no |
\G position of the decimal point in the most recent numeric conversion. |
\G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds |
\G Initialised to -1. After the conversion of a number containing no |
\G 0. After the conversion of 234123.9 it contains 1, and so forth. |
\G decimal point, @code{dpl} is -1. After the conversion of @code{2.} it holds |
-1 dpl ! |
\G 0. After the conversion of 234123.9 it contains 1, and so forth. |
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-1 dpl ! |
User state ( -- a-addr ) \ core,tools-ext |
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\G USER VARIABLE: @i{a-addr} is the address of a cell containing the |
User state ( -- a-addr ) \ core,tools-ext |
\G compilation state flag. 0 => interpreting, -1 => compiling. A |
\G @code{User} variable -- @i{a-addr} is the address of a cell |
\G program shall not directly alter the value of @code{state}. The |
\G containing the compilation state flag. 0 => interpreting, -1 => |
\G following Standard words alter the value in @code{state}: @code{:} |
\G compiling. A program shall not directly alter the value of |
\G (colon) @code{;} (semicolon) @code{abort} @code{quit} |
\G @code{state}. The following Standard words alter the value in |
\G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket) |
\G @code{state}: @code{:} (colon) @code{;} (semicolon) @code{abort} |
\G @code{;code}. Don't use @code{state}! @xref{Interpretation and |
\G @code{quit} @code{:noname} @code{[} (left-bracket) @code{]} |
\G Compilation Semantics} for an alternative. |
\G (right-bracket) @code{;code}. Don't use @code{state}! For an |
\ Recommended reading: @cite{@code{State}-smartness--Why it is evil |
\G alternative see @ref{Interpretation and Compilation Semantics}. |
\ and how to exorcise it}, |
\ Recommended reading: @cite{@code{State}-smartness--Why it is evil |
\ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
\ and how to exorcise it}, |
\ version: Don't use @code{state}! |
\ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short |
0 state ! |
\ version: Don't use @code{state}! |
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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 ! |
Line 178 AUser dpp normal-dp dpp !
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Line 202 AUser dpp normal-dp dpp !
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AUser LastCFA |
AUser LastCFA |
AUser Last |
AUser Last |
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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] |
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 |