[gforth] / gforth / kernel / vars.fs  

gforth: gforth/kernel/vars.fs

Diff for /gforth/kernel/vars.fs between version 1.5 and 1.41

version 1.5, Sat Nov 21 20:24:16 1998 UTC version 1.41, Sun Mar 5 14:10:52 2006 UTC
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 \ VARS.FS      Kernal variables  \ VARS.FS      Kernal variables
   
 \ Copyright (C) 1995 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.
   
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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.
   
 hex \ everything now hex!                               11may93jaw  hex \ everything now hex!                               11may93jaw
   
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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!
   
     0 Constant false ( -- f ) \ core-ext
   \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 \ used by docon:, must be constant  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
   
 FF Constant /line  FF Constant /line
   
   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
   [THEN]
   
   20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )
   
   has? EC 0= [IF]
   create holdbuf word-pno-size chars allot
   holdbuf word-pno-size chars + aconstant holdbuf-end
   avariable holdptr holdbuf-end holdptr a!
   avariable holdend holdbuf-end holdend a!
   [THEN]
   
 $20 8 2* cells + 2 + cell+ constant word-pno-size ( -- u )  
 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
   
 \ User variables                                       13feb93py  \ User variables                                       13feb93py
   
 \ initialized by COLD  \ initialized by COLD
   
 Create main-task  100 cells allot  has? no-userspace 0= [IF]
   Create main-task  has? OS [IF] 100 [ELSE] 40 [THEN] cells dup allot
   
 \ 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
   
 Variable udp  Variable udp ( -- a-addr ) \ gforth
   \G user area size
   
 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 sp0       \ used by douser:, must be user  [THEN]
                 ' sp0 Alias s0  AUser sp0 ( -- a-addr ) \ gforth
 AUser rp0       ' rp0 Alias r0  \G @code{User} variable -- initial value of the data stack pointer.
 AUser fp0       \ no f0, because this leads to unexpected results  \ sp0 is used by douser:, must be user
 AUser lp0       ' lp0 Alias l0  \    ' sp0 Alias s0 ( -- a-addr ) \ gforth
   \G OBSOLETE alias of @code{sp0}
   
   AUser rp0 ( -- a-addr ) \ gforth
   \G @code{User} variable -- initial value of the return stack pointer.
   \    ' 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  AUser handler   \ pointer to last throw frame
   has? backtrace [IF]
   User backtrace-empty \ true if the next THROW should store a backtrace
   AUser backtrace-rp0 \ rp at last call of interpret
   [THEN]
 \ AUser output  \ AUser output
 \ AUser input  \ AUser input
   
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 AUser "error            0 "error !  AUser "error            0 "error !
   
   has? new-input [IF]
       User current-input
   [ELSE]
 [IFUNDEF] #tib          \ in ec-Version we may define this ourself  [IFUNDEF] #tib          \ in ec-Version we may define this ourself
  User tibstack          \ saves >tib in execute   User tibstack          \ saves >tib in execute
  User >tib              \ pointer to terminal input buffer   User >tib              \ pointer to terminal input buffer
  User #tib              \ chars in terminal input buffer          User #tib ( -- a-addr ) \ core-ext number-t-i-b
  User >in               0 >in ! \ char number currently processed in tib          \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]  [THEN]
  User blk               0 blk !  
   has? file [IF]
    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
    \G interpreted. A Standard program should not alter @code{blk} directly.
                           0 blk !
   
  User loadfile          0 loadfile !   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   User loadline          \ number of the currently interpreted
                         \ (in TIB) line if the interpretation                          \ (in TIB) line if the interpretation
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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]
   
    2user includefilename  0 0 includefilename 2! \ innermost included file
   
   
  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
   \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 !
   
  User 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 !
                         \ the pointer to the current dictionary pointer                          \ the pointer to the current dictionary pointer
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 AUser LastCFA  AUser LastCFA
 AUser Last  AUser Last
   
   has? flash [IF]
       AUser flash-dp
       : rom  flash-dp dpp ! ;
       : ram  normal-dp dpp ! ;
   [THEN]
   
   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]
 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
   [THEN]
   

Generate output suitable for use with a patch program
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