Diff for /gforth/kernel/vars.fs between versions 1.18 and 1.34

version 1.18, 1999/05/17 14:59:00 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: @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!

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.

[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]

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.
[THEN]

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

Line 58  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 71  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]  has? backtrace [IF]
Line 108  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: @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
\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
\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
\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: @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] 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 142  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: @i{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 ( -- a-addr ) \ gforth  User dpl ( -- a-addr ) \ gforth
\G USER VARIABLE: @i{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 position of the decimal point in the most recent numeric conversion.  \G position of the decimal point in the most recent numeric conversion.
\G Initialised to -1. After the conversion of a number containing no  \G Initialised to -1. After the conversion of a number containing no
\G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds  \G decimal point, @code{@ dpl} is -1. After the conversion of @code{2.} it holds
\G 0. After the conversion of 234123.9 it contains 1, and so forth.  \G 0. After the conversion of 234123.9 it contains 1, and so forth.
-1 dpl !  -1 dpl !

User state ( -- a-addr ) \ core,tools-ext  User state ( -- a-addr ) \ core,tools-ext
\G USER VARIABLE: @i{a-addr} is the address of a cell containing the  \G @code{User} variable -- @i{a-addr} is the address of a cell
\G compilation state flag. 0 => interpreting, -1 => compiling.  A  \G containing the compilation state flag. 0 => interpreting, -1 =>
\G program shall not directly alter the value of @code{state}. The  \G compiling.  A program shall not directly alter the value of
\G following Standard words alter the value in @code{state}: @code{:}  \G @code{state}. The following Standard words alter the value in
\G (colon) @code{;} (semicolon) @code{abort} @code{quit}  \G @code{state}: @code{:} (colon) @code{;} (semicolon) @code{abort}
\G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket)  \G @code{quit} @code{:noname} @code{[} (left-bracket) @code{]}
\G @code{;code}. Don't use @code{state}! @xref{Interpretation and  \G (right-bracket) @code{;code}. Don't use @code{state}! For an
\G Compilation Semantics} for an alternative.   \G alternative see @ref{Interpretation and Compilation Semantics}.
\  Recommended reading: @cite{@code{State}-smartness--Why it is evil  \ Recommended reading: @cite{@code{State}-smartness--Why it is evil
\  and how to exorcise it},  \ and how to exorcise it},
\  @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short  \ @url{http://www.complang.tuwien.ac.at/papers/ertl98.ps.gz}; short
\  version: Don't use @code{state}!   \ version: Don't use @code{state}!
0 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 178  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.1.18 changed lines Added in v.1.34

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