Diff for /gforth/kernel/vars.fs between versions 1.14 and 1.34

version 1.14, 1999/03/23 20:24:27 version 1.34, 2003/03/09 15:17:07
Line 1 Line 1
\ VARS.FS      Kernal variables  \ VARS.FS      Kernal variables

\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.  \ Copyright (C) 1995,1996,1997,1998,2000,2003 Free Software Foundation, Inc.

\ This file is part of Gforth.  \ This file is part of Gforth.

Line 16 Line 16

\ 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.

hex \ everything now hex!                               11may93jaw  hex \ everything now hex!                               11may93jaw

Line 26  hex \ everything now hex! Line 26  hex \ everything now hex!
\ "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: @var{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!

0 Constant false ( -- f ) \ core-ext    0 Constant false ( -- f ) \ core-ext
\G CONSTANT: @var{f} is a cell with all bits clear.  \G @code{Constant} -- @i{f} is a cell with all bits clear.

[IFUNDEF] cell
1 cells Constant cell ( -- u ) \ gforth  1 cells Constant cell ( -- u ) \ gforth
\G @code{Constant} -- @code{1 cells}
[THEN]

has? floating [IF]
1 floats Constant float ( -- u ) \ gforth  1 floats Constant float ( -- u ) \ gforth
\G @code{Constant} -- the number of address units corresponding to a floating-point number.
[THEN]

20 Constant bl ( -- c-char ) \ core  20 Constant bl ( -- c-char ) \ core b-l
\G @var{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

FF Constant /line  FF Constant /line
Line 45  FF Constant /line Line 52  FF Constant /line
10 Constant l/s  10 Constant l/s
400 Constant chars/block  400 Constant chars/block

\$20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )  20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
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!
Line 53  avariable holdend holdbuf-end holdend a! Line 60  avariable holdend holdbuf-end holdend a!

84 constant pad-minsize ( -- u )  84 constant pad-minsize ( -- u )

\$400 Value def#tib
\G default size of terminal input buffer. Default size is 1K

\ that's enough so long  \ that's enough so long

Line 66  Create main-task  has? OS [IF] 100 [ELSE Line 75  Create main-task  has? OS [IF] 100 [ELSE
UNLOCK tup ! LOCK  UNLOCK tup ! LOCK

Variable udp \ user area size? -anton  Variable udp ( -- a-addr ) \ gforth
\G user area size

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}

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}

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
[THEN]

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}
[THEN]

AUser handler   \ pointer to last throw frame  AUser handler   \ pointer to last throw frame
has? backtrace [IF]
User backtrace-empty \ true if the next THROW should store a backtrace  User backtrace-empty \ true if the next THROW should store a backtrace
AUser backtrace-rp0 \ rp at last call of interpret  AUser backtrace-rp0 \ rp at last call of interpret
[THEN]
\ AUser output  \ AUser output
\ AUser input  \ AUser input

Line 101  AUser errorhandler Line 117  AUser errorhandler

AUser "error            0 "error !  AUser "error            0 "error !

[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: @var{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
\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: @var{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 terminal input buffer to the
\G start of the 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
\G parse area.
0 >in ! \ char number currently processed in tib
[THEN]

has? file [IF]  has? file [IF]
User blk ( -- a-addr ) \ block   User blk ( -- a-addr ) \ block b-l-k
\G USER VARIABLE: @var{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 125  has? file [IF] Line 145  has? file [IF]

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 135  has? file [IF] Line 155  has? file [IF]
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]
[THEN]

User base ( -- a-addr ) \ core  User base ( -- a-addr ) \ core
\G USER VARIABLE: @var{a-addr} is the address of a cell that stores the  \G @code{User} variable -- @i{a-addr} is the address of a cell that stores the
\G number base used by default for number conversion during input and output.  \G number base used by default for number conversion during input and output.
A base !                         A base !
User dpl               -1 dpl !  User dpl ( -- a-addr ) \ gforth
\G @code{User} variable -- @i{a-addr} is the address of a cell that stores the
User state ( -- a-addr ) \ core,tools-ext  \G position of the decimal point in the most recent numeric conversion.
\G Recommended reading: @cite{@code{State}-smartness--Why it is evil  \G Initialised to -1. After the conversion of a number containing no
\G and how to exorcise it},  \G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds
\G @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short  \G 0. After the conversion of 234123.9 it contains 1, and so forth.
\G version: Don't use @code{state}! @xref{Interpretation and  -1 dpl !
\G Compilation Semantics} for an alternative. USER VARIABLE: @var{a-addr}
\G is the address of a cell containing the compilation state flag. 0  User state ( -- a-addr ) \ core,tools-ext
\G => interpreting, -1 => compiling.  A program shall not directly  \G @code{User} variable -- @i{a-addr} is the address of a cell
\G alter the value of @code{state}. The following Standard words  \G containing the compilation state flag. 0 => interpreting, -1 =>
\G alter the value in @code{state}: @code{:} (colon) @code{;}  \G compiling.  A program shall not directly alter the value of
\G (semicolon) @code{abort} @code{quit} @code{:noname} @code{[}  \G @code{state}. The following Standard words alter the value in
\G (left-bracket) @code{]} (right-bracket) @code{;code}  \G @code{state}: @code{:} (colon) @code{;} (semicolon) @code{abort}
0 state !  \G @code{quit} @code{:noname} @code{[} (left-bracket) @code{]}
\G (right-bracket) @code{;code}. Don't use @code{state}! For an
\G alternative see @ref{Interpretation and Compilation Semantics}.
\ Recommended reading: @cite{@code{State}-smartness--Why it is evil
\ and how to exorcise it},
\ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short
\ version: Don't use @code{state}!
0 state !

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 164  AUser dpp  normal-dp dpp ! Line 192  AUser dpp  normal-dp dpp !
AUser LastCFA  AUser LastCFA
AUser Last  AUser Last

AUser last-compiled \ last compile,d xt
\ 0 if last xt was dyn-compiled already (basic-block-end)
0 last-compiled !
AUser last-compiled-here \ where LAST-COMPILED should be stored

User max-name-length \ maximum length of all names defined yet
32 max-name-length !

\  has? peephole  [IF]
\  0 value peeptable \ initialized in boot
\  [THEN]

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

 Removed from v.1.14 changed lines Added in v.1.34

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