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\ data structures (like C structs)
\ Copyright (C) 1995,1997,2000,2003,2007 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 3
\ 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
\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
\ 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, see http://www.gnu.org/licenses/.
: naligned ( addr1 n -- addr2 ) \ gforth
\g @var{addr2} is the aligned version of @var{addr1} with respect to the
\g alignment @var{n}.
1- tuck + swap invert and ;
' naligned alias nalign \ old name, obsolete
: dozerofield ( -- )
\ a field that makes no change
\ to enable accessing the offset with "['] <field> >body @" this
\ is not implemented with "['] noop alias"
latest
if
immediate
then
does> ( name execution: -- )
drop ;
: field, ( align1 offset1 align size -- align2 offset2 )
swap rot over nalign dup , ( align1 size align offset )
rot + >r nalign r> ;
: create-field ( align1 offset1 align size -- align2 offset2 )
create field, ;
: field ( align1 offset1 align size "name" -- align2 offset2 ) \ gforth
\g Create a field @var{name} with offset @var{offset1}, and the type
\g given by @var{align size}. @var{offset2} is the offset of the
\g next field, and @var{align2} is the alignment of all fields.@*
\g @code{name} execution: @var{addr1} -- @var{addr2}.@*
\g @var{addr2}=@var{addr1}+@var{offset1}
2 pick
if \ field offset <> 0
[IFDEF] (Field)
(Field)
[ELSE]
Header reveal dofield: cfa,
[THEN]
else
create dozerofield
then
field, ;
: end-struct ( align size "name" -- ) \ gforth
\g Define a structure/type descriptor @var{name} with alignment
\g @var{align} and size @var{size1} (@var{size} rounded up to be a
\g multiple of @var{align}).@*
\g @code{name} execution: -- @var{align size1}@*
over nalign \ pad size to full alignment
2constant ;
1 chars 0 end-struct struct ( -- align size ) \ gforth
\g An empty structure, used to start a structure definition.
\ type descriptors
1 aligned 1 cells 2constant cell% ( -- align size ) \ gforth
1 chars 1 chars 2constant char% ( -- align size ) \ gforth
1 faligned 1 floats 2constant float% ( -- align size ) \ gforth
1 dfaligned 1 dfloats 2constant dfloat% ( -- align size ) \ gforth
1 sfaligned 1 sfloats 2constant sfloat% ( -- align size ) \ gforth
cell% 2* 2constant double% ( -- align size ) \ gforth
\ memory allocation words
' drop alias %alignment ( align size -- align ) \ gforth
\g The alignment of the structure.
' nip alias %size ( align size -- size ) \ gforth
\g The size of the structure.
: %align ( align size -- ) \ gforth
\G Align the data space pointer to the alignment @var{align}.
drop here swap nalign here - allot ;
: %allot ( align size -- addr ) \ gforth
\g Allot @var{size} address units of data space with alignment
\g @var{align}; the resulting block of data is found at
\g @var{addr}.
tuck %align
here swap allot ;
: %allocate ( align size -- addr ior ) \ gforth
\g Allocate @var{size} address units with alignment @var{align},
\g similar to @code{allocate}.
nip allocate ;
: %alloc ( align size -- addr ) \ gforth
\g Allocate @var{size} address units with alignment @var{align},
\g giving a data block at @var{addr}; @code{throw} an ior code
\g if not successful.
%allocate throw ;
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