version 1.2, 1997/06/06 17:28:13
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version 1.5, 1998/04/14 16:43:21
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\ data structures (like C structs) |
\ data structures (like C structs) |
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\ Copyright (C) 1995 Free Software Foundation, Inc. |
\ This file is in the public domain. NO WARRANTY. |
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\ This file is part of Gforth. |
\ This program uses the following words |
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\ from CORE : |
\ Gforth is free software; you can redistribute it and/or |
\ : 1- + swap invert and ; DOES> @ immediate drop Create rot dup , >r |
\ modify it under the terms of the GNU General Public License |
\ r> IF ELSE THEN over chars aligned cells 2* here - allot |
\ as published by the Free Software Foundation; either version 2 |
\ from CORE-EXT : |
\ of the License, or (at your option) any later version. |
\ tuck pick nip |
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\ from BLOCK-EXT : |
\ This program is distributed in the hope that it will be useful, |
\ \ |
\ but WITHOUT ANY WARRANTY; without even the implied warranty of |
\ from DOUBLE : |
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
\ 2Constant |
\ GNU General Public License for more details. |
\ from EXCEPTION : |
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\ throw |
\ You should have received a copy of the GNU General Public License |
\ from FILE : |
\ along with this program; if not, write to the Free Software |
\ ( |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ from FLOAT : |
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\ faligned floats |
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\ from FLOAT-EXT : |
\ Usage example: |
\ dfaligned dfloats sfaligned sfloats |
\ |
\ from MEMORY : |
\ struct |
\ allocate |
\ 1 cells: field search-method |
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\ 1 cells: field reveal-method |
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\ end-struct wordlist-map |
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\ |
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\ The structure can then be extended in the following way |
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\ wordlist-map |
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\ 1 cells: field enum-method |
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\ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method |
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\ This is an ANS Forth program with an environmental dependency on |
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\ alignments that are powers of 2 (rewrite nalign for other systems) |
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\ and with an environmental dependence on case insensitivity (convert |
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\ everything to upper case for state sensitive systems). |
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\ The program uses the following words |
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\ !! |
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: nalign ( addr1 n -- addr2 ) |
: nalign ( addr1 n -- addr2 ) |
\ addr2 is the aligned version of addr1 wrt the alignment size n |
\ addr2 is the aligned version of addr1 wrt the alignment size n |
Line 52 does> ( name execution: addr1 -- addr2 )
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Line 36 does> ( name execution: addr1 -- addr2 )
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does> ( name execution: -- ) |
does> ( name execution: -- ) |
drop ; |
drop ; |
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: create-field ( offset1 align1 size align "name" -- offset2 align2 ) |
: create-field ( align1 offset1 align size "name" -- align2 offset2 ) |
create |
create swap rot over nalign dup , ( align1 size align offset ) |
>r rot r@ nalign dup , ( align1 size offset R: align ) |
rot + >r nalign r> ; |
+ swap r> nalign ; |
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: field ( offset1 align1 size align "name" -- offset2 align2 ) |
: field ( align1 offset1 align size "name" -- align2 offset2 ) |
\ name execution: addr1 -- addr2 |
\ name execution: addr1 -- addr2 |
3 pick >r \ this uglyness is just for optimizing with dozerofield |
2 pick >r \ this uglyness is just for optimizing with dozerofield |
create-field |
create-field |
r> |
r> if \ offset<>0 |
dup if |
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dofield |
dofield |
else |
else |
dozerofield |
dozerofield |
then ; |
then ; |
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: end-struct ( size align -- ) |
: end-struct ( align size "name" -- ) |
tuck nalign swap \ pad size to full alignment |
over nalign \ pad size to full alignment |
2constant ; |
2constant ; |
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0 1 chars end-struct struct |
\ an empty struct |
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1 chars 0 end-struct struct |
\ I don't really like the "type:" syntax. Any other ideas? - anton |
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\ Also, this seems to be somewhat general. It probably belongs to some |
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\ other place |
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: cells: ( n -- size align ) |
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cells 1 aligned ; |
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: doubles: ( n -- size align ) |
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2* cells 1 aligned ; |
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: chars: ( n -- size align ) |
\ type descriptors, all ( -- align size ) |
chars 1 chars ; |
1 aligned 1 cells 2constant cell% |
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1 chars 1 chars 2constant char% |
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1 faligned 1 floats 2constant float% |
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1 dfaligned 1 dfloats 2constant dfloat% |
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1 sfaligned 1 sfloats 2constant sfloat% |
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cell% 2* 2constant double% |
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: floats: ( n -- size align ) |
\ memory allocation words |
floats 1 faligned ; |
: %alignment ( align size -- align ) |
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drop ; |
: dfloats: ( n -- size align ) |
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dfloats 1 dfaligned ; |
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: sfloats: ( n -- size align ) |
: %size ( align size -- size ) |
sfloats 1 sfaligned ; |
nip ; |
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: struct-align ( size align -- ) |
: %align ( align size -- ) |
here swap nalign here - allot |
drop here swap nalign here - allot ; |
drop ; |
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: struct-allot ( size align -- addr ) |
: %allot ( align size -- addr ) |
over swap struct-align |
tuck %align |
here swap allot ; |
here swap allot ; |
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: struct-allocate ( size align -- addr ior ) |
: %allocate ( align size -- addr ior ) |
drop allocate ; |
nip allocate ; |
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: struct-alloc ( size align -- addr ) |
: %alloc ( size align -- addr ) |
struct-allocate throw ; |
%allocate throw ; |