File:  [gforth] / gforth / intcomp.fs
Revision 1.1: download - view: text, annotated - select for diffs
Mon Aug 26 10:07:19 1996 UTC (22 years, 11 months ago) by anton
Branches: MAIN
CVS tags: HEAD
' and ['] now deliver an error for compile-only words.
renamed special- words into interpret/compile- words.
refactored some of the recent changes.
adapted see to the changes
added way to make a word that defines words with differring
 interpretation and compilation code.

    1: \ defining words for words with non-default and non-immediate compilation semantics
    2: 
    3: \ Copyright (C) 1996 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 2
   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, write to the Free Software
   19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   20: 
   21: \ used like
   22: \ : <name> create-interpret/compile ...
   23: \     interpretation> ... <interpretation
   24: \     compilation> ... <compilation ;
   25: 
   26: 
   27: noname create
   28: does> abort" interpreting word without interpretation semantics" ;
   29: lastxt >does-code
   30: does> abort" compiling word without compilation semantics" ;
   31: lastxt >does-code
   32: constant no-compilation-does-code
   33: constant no-interpretation-does-code
   34: 
   35: : create-interpret/compile ( -- )
   36:     0 0 interpret/compile:
   37:     here lastxt interpret/compile-int !
   38:     no-interpretation-does-code here does-code!
   39:     0 >body allot
   40:     here lastxt interpret/compile-comp !
   41:     no-compilation-does-code here does-code!
   42:     0 >body allot ; \ restrict?
   43: 
   44: : fix-does-code ( addr ret-addr -- )
   45:     lastxt [ interpret/compile-struct drop ] literal + >r
   46:     lastxt interpret/compile?
   47:     lastxt interpret/compile-int @ r@ = and
   48:     lastxt interpret/compile-comp @ r> >body = and
   49:     0= abort" not created with create-interpret/compile"
   50:     cell+ cell+ /does-handler + \ to does-code
   51:     swap @ does-code! ;
   52: 
   53: : (interpretation>) ( -- )
   54:     lastxt interpret/compile-int r@ fix-does-code ;
   55: 
   56: : interpretation> ( -- orig colon-sys )
   57:     POSTPONE (interpretation>) POSTPONE ahead
   58:     dodoes, defstart dead-code off 0 set-locals-size-list POSTPONE >body ; immediate restrict
   59: 
   60: : <interpretation ( orig colon-sys -- )
   61:     ?struc POSTPONE exit
   62:     POSTPONE then ; immediate restrict
   63: 
   64: : (compilation>) ( -- )
   65:     lastxt interpret/compile-comp r@ fix-does-code ;
   66: 
   67: : compilation> ( -- orig colon-sys )
   68:     POSTPONE (compilation>) POSTPONE ahead
   69:     dodoes, defstart dead-code off 0 set-locals-size-list ; immediate restrict
   70: 
   71: comp' <interpretation drop Alias <compilation immediate restrict
   72: 
   73: \ example
   74: \ : constant ( n "name" -- )
   75: \     create-interpret/compile
   76: \     ,
   77: \ interpretation>
   78: \     @
   79: \ <interpretation
   80: \ compilation>
   81: \     @ postpone literal
   82: \ <compilation ;
   83: 
   84: \ 5 constant five
   85: 
   86: \ cr
   87: \ five . cr
   88: \ : fuenf five ;
   89: \ see fuenf cr

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