File:  [gforth] / gforth / chains.fs
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Tue Dec 8 22:02:36 1998 UTC (20 years, 7 months ago) by anton
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    1: \ chains.fs execution chains for gforth			21jun97jaw
    2: 
    3: \ Copyright (C) 1998 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: 0 [IF]
   22: This defines execution chains.
   23: The first application for this is building initialization chains:
   24: Think of many modules or program parts, each of it with some specific
   25: initialization code. If we hardcode the initialization routines into a
   26: "master-init" we will get unflexible and are not able only to load some
   27: specific modules...
   28: 
   29: The chain is basicaly a linked-list. Define a Variable for the head of
   30: linked-list. Name it "foo8" or "foo-chain" to indicate it is a execution
   31: chain.
   32: 
   33: You can add a word to the list with "' my-init foo8 chained". You can
   34: execute all the code with "foo8 chainperform".
   35: [THEN]
   36: 
   37: has? cross 
   38: [IF]   e? compiler
   39: [ELSE] true
   40: [THEN]
   41: 
   42: [IF] \ only needed with compiler
   43: 
   44: [IFUNDEF] linked
   45: : linked        here over @ a, swap ! ;
   46: [THEN]
   47: 
   48: \ generic chains
   49: 
   50: : chained 	( xt list -- ) \ gforth
   51:   linked , ;
   52: 
   53: [THEN]
   54: 
   55: : chainperform	( list -- ) \ gforth
   56:   BEGIN @ dup WHILE dup cell+ perform REPEAT drop ;
   57: 

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