--- gforth/kernel/vars.fs 1999/11/08 22:01:12 1.19 +++ gforth/kernel/vars.fs 2003/01/20 19:17:59 1.32 @@ -1,6 +1,6 @@ \ VARS.FS Kernal variables -\ Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc. +\ Copyright (C) 1995,1996,1997,1998,2000 Free Software Foundation, Inc. \ This file is part of Gforth. @@ -16,7 +16,7 @@ \ You should have received a copy of the GNU General Public License \ 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 @@ -34,13 +34,15 @@ hex \ everything now hex! [IFUNDEF] cell 1 cells Constant cell ( -- u ) \ gforth -\G @code{Constant} -- the number of address units corresponding to 1 cell. +\G @code{Constant} -- @code{1 cells} [THEN] +has? floating [IF] 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 @i{c-char} is the character value for a space. \ used by docon:, must be constant @@ -58,6 +60,8 @@ avariable holdend holdbuf-end holdend a! 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 @@ -72,7 +76,7 @@ main-task UNLOCK tup ! LOCK Variable udp ( -- a-addr ) \ gforth -\ user area size? -anton +\G user area size AUser next-task main-task next-task ! AUser prev-task main-task prev-task ! @@ -88,14 +92,18 @@ AUser rp0 ( -- a-addr ) \ gforth ' rp0 Alias r0 ( -- a-addr ) \ gforth \G OBSOLETE alias of @code{rp0} +has? floating [IF] AUser fp0 ( -- a-addr ) \ gforth \G @code{User} variable -- initial value of the floating-point stack pointer. \ no f0, because this leads to unexpected results when using hex +[THEN] +has? glocals [IF] AUser lp0 ( -- a-addr ) \ gforth \G @code{User} variable -- initial value of the locals stack pointer. ' lp0 Alias l0 ( -- a-addr ) \ gforth \G OBSOLETE alias of @code{lp0} +[THEN] AUser handler \ pointer to last throw frame has? backtrace [IF] @@ -109,22 +117,26 @@ AUser errorhandler AUser "error 0 "error ! -[IFUNDEF] #tib \ in ec-Version we may define this ourself - User tibstack \ saves >tib in execute - User >tib \ pointer to terminal input buffer - User #tib ( -- a-addr ) \ core-ext - \G @code{User} variable -- @i{a-addr} is the address of a cell containing - \G the number of characters in the terminal input buffer. - \G OBSOLESCENT: @code{source} superceeds the function of this word. - - User >in ( -- a-addr ) \ core - \G @code{User} variable -- @i{a-addr} is the address of a cell containing the - \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? new-input [IF] + User current-input +[ELSE] + [IFUNDEF] #tib \ in ec-Version we may define this ourself + User tibstack \ saves >tib in execute + User >tib \ pointer to terminal input buffer + User #tib ( -- a-addr ) \ core-ext number-t-i-b + \G @code{User} variable -- @i{a-addr} is the address of a cell containing + \G the number of characters in the terminal input buffer. + \G OBSOLESCENT: @code{source} superceeds the function of this word. + + User >in ( -- a-addr ) \ core to-in + \G @code{User} variable -- @i{a-addr} is the address of a cell containing the + \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] - User blk ( -- a-addr ) \ block + User blk ( -- a-addr ) \ block b-l-k \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 by @code{source-id}) or the number of the block currently being @@ -133,7 +145,7 @@ has? file [IF] User loadfile 0 loadfile ! - User loadfilename# 0 loadfilename# ! + 2user loadfilename 0 0 loadfilename 2! \ addr u for sourcefilename User loadline \ number of the currently interpreted \ (in TIB) line if the interpretation @@ -143,33 +155,34 @@ has? file [IF] 2User linestart \ starting file postition of \ the current interpreted line (in TIB) [THEN] +[THEN] - User base ( -- a-addr ) \ core - \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. - A base ! - User dpl ( -- a-addr ) \ gforth - \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 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 0. After the conversion of 234123.9 it contains 1, and so forth. - -1 dpl ! - - User state ( -- a-addr ) \ core,tools-ext - \G @code{User} variable -- @i{a-addr} is the address of a cell containing the - \G compilation state flag. 0 => interpreting, -1 => compiling. A - \G program shall not directly alter the value of @code{state}. The - \G following Standard words alter the value in @code{state}: @code{:} - \G (colon) @code{;} (semicolon) @code{abort} @code{quit} - \G @code{:noname} @code{[} (left-bracket) @code{]} (right-bracket) - \G @code{;code}. Don't use @code{state}! @xref{Interpretation and - \G Compilation Semantics} for an alternative. - \ 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 ! +User base ( -- a-addr ) \ core +\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. + A base ! +User dpl ( -- a-addr ) \ gforth +\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 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 0. After the conversion of 234123.9 it contains 1, and so forth. +-1 dpl ! + +User state ( -- a-addr ) \ core,tools-ext +\G @code{User} variable -- @i{a-addr} is the address of a cell +\G containing the compilation state flag. 0 => interpreting, -1 => +\G compiling. A program shall not directly alter the value of +\G @code{state}. The following Standard words alter the value in +\G @code{state}: @code{:} (colon) @code{;} (semicolon) @code{abort} +\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 dpp normal-dp dpp ! @@ -179,6 +192,15 @@ AUser dpp normal-dp dpp ! AUser LastCFA 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 + +has? peephole [IF] +0 value peeptable \ initialized in boot +[THEN] + has? glocals [IF] User locals-size \ this is the current size of the locals stack \ frame of the current word