File:  [gforth] / gforth / chains.fs
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Tue Dec 8 22:02:36 1998 UTC (25 years ago) by anton
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\ chains.fs execution chains for gforth			21jun97jaw

\ Copyright (C) 1998 Free Software Foundation, Inc.

\ This file is part of Gforth.

\ Gforth is free software; you can redistribute it and/or
\ modify it under the terms of the GNU General Public License
\ as published by the Free Software Foundation; either version 2
\ of the License, or (at your option) any later version.

\ This program is distributed in the hope that it will be useful,
\ but WITHOUT ANY WARRANTY; without even the implied warranty of
\ GNU General Public License for more details.

\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

0 [IF]
This defines execution chains.
The first application for this is building initialization chains:
Think of many modules or program parts, each of it with some specific
initialization code. If we hardcode the initialization routines into a
"master-init" we will get unflexible and are not able only to load some
specific modules...

The chain is basicaly a linked-list. Define a Variable for the head of
linked-list. Name it "foo8" or "foo-chain" to indicate it is a execution

You can add a word to the list with "' my-init foo8 chained". You can
execute all the code with "foo8 chainperform".

has? cross 
[IF]   e? compiler
[ELSE] true

[IF] \ only needed with compiler

[IFUNDEF] linked
: linked        here over @ a, swap ! ;

\ generic chains

: chained 	( xt list -- ) \ gforth
  linked , ;


: chainperform	( list -- ) \ gforth
  BEGIN @ dup WHILE dup cell+ perform REPEAT drop ;

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