File:  [gforth] / gforth / locals.fs
Revision 1.9: download - view: text, annotated - select for diffs
Mon Dec 31 18:40:24 2007 UTC (11 years, 7 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright notices for GPL v3

    1: \ Local primitives                                      17jan92py
    2: 
    3: \ Copyright (C) 1995,2000,2003 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation, either version 3
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program. If not, see http://www.gnu.org/licenses/.
   19: 
   20: Variable loffset   0 loffset !
   21: Variable locals  here locals !  100 ( some) cells allot
   22: : local, ( offset -- )  postpone rp@ loffset @ swap -
   23:   postpone Literal postpone + ;
   24: : delocal, ( offset -- ) local, postpone rp! ;
   25: : (local  DOES>  @ local, postpone @ ;
   26: : f>r  r> rp@ 1 floats - dup rp! f! >r ;
   27: : (flocal DOES>  @ local, postpone f@ ;
   28: 
   29: : do-nothing ;
   30: : ralign  r>
   31:   BEGIN  rp@ [ 1 floats 1- ] Literal and
   32:          WHILE  [ ' do-nothing >body ] ALiteral >r
   33:   REPEAT  >r ;
   34: 
   35: : <local ( -- sys1 )  current @ @ loffset @ locals @
   36:   over 0= IF  postpone  ralign  THEN  ;                 immediate
   37: : local: ( -- )  postpone >r  latest latestxt here locals @ dp !
   38:   cell loffset +! Create  loffset @ , immediate (local
   39:   here locals !  dp !  lastcfa ! last ! ;               immediate
   40: : flocal: ( -- )  latest latestxt here locals @ dp !
   41:   BEGIN  loffset @ 0 1 floats fm/mod drop  WHILE
   42:          0 postpone Literal postpone >r  1 cells  loffset +!  REPEAT
   43:   postpone f>r  Create  loffset @ , immediate (flocal
   44:   here locals !  dp !  lastcfa ! last ! ;               immediate
   45: : local> ( sys1 -- sys2 ) ;                             immediate
   46: : local; ( sys2 -- ) locals ! dup delocal,
   47:   loffset ! current @ ! ;                               immediate
   48: : TO  >in @ ' dup @ [ ' (local >body cell+ ] ALiteral =
   49:   IF    >body @ local, postpone ! drop
   50:   ELSE  dup @ [ ' (flocal >body cell+ ] ALiteral =
   51:         IF    >body @ local, postpone f!  drop
   52:         ELSE  drop >in ! postpone to  THEN THEN ;       immediate
   53: 
   54: : DO      2 cells loffset +!  postpone DO     ; immediate restrict
   55: : ?DO     2 cells loffset +!  postpone ?DO    ; immediate restrict
   56: : FOR     2 cells loffset +!  postpone FOR    ; immediate restrict
   57: : LOOP   -2 cells loffset +!  postpone LOOP   ; immediate restrict
   58: : +LOOP  -2 cells loffset +!  postpone +LOOP  ; immediate restrict
   59: : NEXT   -2 cells loffset +!  postpone NEXT   ; immediate restrict
   60: : >R      1 cells loffset +!  postpone >R     ; immediate restrict
   61: : R>     -1 cells loffset +!  postpone R>     ; immediate restrict
   62: 
   63: \ High level locals                                    19aug93py
   64: 
   65: : { postpone <local  -1
   66:   BEGIN  >in @ name dup c@ 1 = swap 1+ c@ '| = and  UNTIL
   67:   drop >in @ >r
   68:   BEGIN  dup 0< 0= WHILE  >in ! postpone local:  REPEAT  drop
   69:   r> >in ! postpone local> ;                  immediate restrict
   70: 
   71: : F{ postpone <local  -1
   72:   BEGIN  >in @ name dup c@ 1 = swap 1+ c@ '| = and  UNTIL
   73:   drop >in @ >r
   74:   BEGIN  dup 0< 0= WHILE  >in ! postpone Flocal:  REPEAT  drop
   75:   r> >in ! postpone local> ;                  immediate restrict
   76: 
   77: ' local; alias } immediate restrict
   78: 
   79: \ ANS Locals                                           19aug93py
   80: 
   81: Create inlocal  5 cells allot  inlocal off
   82: : (local)  ( addr u -- )  inlocal @ 0=
   83:   IF  postpone <local inlocal on
   84:       inlocal 3 cells + 2!  inlocal cell+ 2! THEN
   85:   dup IF    linestart @ >r sourceline# >r loadfile @ >r
   86:             blk @ >r >tib @ >r  #tib @ dup >r  >in @ >r
   87: 
   88:             >tib +! dup #tib ! >tib @ swap move
   89:             >in off blk off loadfile off -1 linestart !
   90: 
   91:             postpone local:
   92: 
   93:             r> >in !  r> #tib !  r> >tib ! r> blk !
   94:             r> loadfile ! r> loadline ! r> linestart !
   95:       ELSE  2drop  inlocal cell+ 2@  inlocal 3 cells + 2@
   96:             postpone local>
   97:             inlocal 2 cells + 2! inlocal cell+ ! THEN ;
   98: 
   99: : ?local;  inlocal @
  100:   IF  inlocal cell+ @ inlocal 2 cells + 2@
  101:       postpone local; inlocal off  THEN ;
  102: 
  103: : ;      ?local; postpone ; ;                 immediate restrict
  104: : DOES>  ?local; postpone DOES> ;             immediate
  105: : EXIT  inlocal @ IF  0 delocal,  THEN  postpone EXIT ; immediate
  106: 
  107: : locals|
  108:   BEGIN  name dup c@ 1 = over 1+ c@ '| = and 0=  WHILE
  109:          count (local)  REPEAT  0 (local) ;   immediate restrict

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