version 1.7, 1995/10/07 17:38:20
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version 1.11, 1997/06/06 17:27:58
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\ $Id$ |
\ data structures (like C structs) |
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\ Copyright (C) 1995, 1997 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
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\ modify it under the terms of the GNU General Public License |
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\ as published by the Free Software Foundation; either version 2 |
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\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
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\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
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\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
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\ along with this program; if not, write to the Free Software |
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\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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\ Usage example: |
\ Usage example: |
\ |
\ |
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\ addr2 is the aligned version of addr1 wrt the alignment size n |
\ addr2 is the aligned version of addr1 wrt the alignment size n |
1- tuck + swap invert and ; |
1- tuck + swap invert and ; |
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: field ( offset1 align1 size align -- offset2 align2 ) |
: dozerofield ( -- ) |
\ note: this version uses local variables |
\ a field that makes no change |
Header reveal dofield: cfa, |
\ to enable accessing the offset with "['] <field> >body @" this |
>r rot r@ nalign dup , ( align1 size offset ) |
\ is not implemented with "['] noop alias" |
+ swap r> nalign ; |
last @ |
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if |
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immediate |
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then |
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does> ( -- ) |
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drop ; |
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: field ( offset1 align1 size align "name" -- offset2 align2 ) \ gforth |
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\G name execution: ( addr1 -- addr2 ) |
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>r rot r@ nalign dup |
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if \ field offset <> 0 |
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[IFDEF] (Field) |
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(Field) |
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[ELSE] |
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Header reveal dofield: cfa, |
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[THEN] |
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else |
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create dozerofield |
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then ( align1 size offset ) |
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dup , + swap r> nalign ; |
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: end-struct ( size align -- ) |
: end-struct ( size align -- ) |
2constant ; |
2constant ; |
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: struct-allocate ( size align -- addr ior ) |
: struct-allocate ( size align -- addr ior ) |
drop allocate ; |
drop allocate ; |
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: struct-alloc ( size align -- addr ) |
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struct-allocate throw ; |