Annotation of gforth/locals.fs, revision 1.9

1.1       pazsan      1: \ Local primitives                                      17jan92py
                      2: 
1.8       anton       3: \ Copyright (C) 1995,2000,2003 Free Software Foundation, Inc.
1.3       anton       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
1.9     ! anton       9: \ as published by the Free Software Foundation, either version 3
1.3       anton      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
1.9     ! anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.3       anton      19: 
1.1       pazsan     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 @ ;
1.2       pazsan     26: : f>r  r> rp@ 1 floats - dup rp! f! >r ;
                     27: : (flocal DOES>  @ local, postpone f@ ;
1.1       pazsan     28: 
1.2       pazsan     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
1.7       anton      37: : local: ( -- )  postpone >r  latest latestxt here locals @ dp !
1.1       pazsan     38:   cell loffset +! Create  loffset @ , immediate (local
                     39:   here locals !  dp !  lastcfa ! last ! ;               immediate
1.7       anton      40: : flocal: ( -- )  latest latestxt here locals @ dp !
1.2       pazsan     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
1.1       pazsan     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
1.2       pazsan     50:   ELSE  dup @ [ ' (flocal >body cell+ ] ALiteral =
                     51:         IF    >body @ local, postpone f!  drop
                     52:         ELSE  drop >in ! postpone to  THEN THEN ;       immediate
1.1       pazsan     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: 
1.2       pazsan     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: 
1.1       pazsan     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
1.4       anton      85:   dup IF    linestart @ >r sourceline# >r loadfile @ >r
1.1       pazsan     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
1.2       pazsan    105: : EXIT  inlocal @ IF  0 delocal,  THEN  postpone EXIT ; immediate
1.1       pazsan    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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