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\ implementation of Forth 200x structures

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\ Copyright (C) 2007,2012,2014,2015,2016,2018 Free Software Foundation, Inc.
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\ 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
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\ as published by the Free Software Foundation, either version 3
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\ 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
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\ along with this program. If not, see http://www.gnu.org/licenses/.
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: standard+field ( n1 n2 "name" -- n3 ) \ X:structures plus-field
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    over if
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        (field) over , dup ,
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    else
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        create dozerofield over , dup ,
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    then
    + ;

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: (sizeof) ( "name" -- size ) ' >body cell+ @ ;
: [sizeof] ( "name" -- size )
    (sizeof) postpone Literal ; immediate compile-only
' (sizeof) comp' [sizeof] drop
interpret/compile: sizeof ( "field" -- size )

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Defer +field
\ A number of things have field-like structure, but not
\ exactly field-like behavior.  Objects, locals, etc.
\ Allow them to plug into +field.

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defer standard:field ( -- )
\g set +field to standard behavior
:noname  ['] standard+field IS +field ; is standard:field
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standard:field

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: extend-structure ( n "name" -- struct-sys n ) \ Gforth
    \g extend an existing structure
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    standard:field >r 0 value latestnt >body r> ;
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: begin-structure ( "name" -- struct-sys 0 ) \ X:structures
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    0 extend-structure ;
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: end-structure ( struct-sys +n -- ) \ X:structures
    swap ! ;

: cfield: ( u1 "name" -- u2 ) \ X:structures
    1 +field ;

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: wfield: ( u1 "name" -- u2 ) \ X:structures
    1 + -2 and 2 +field ;

: lfield: ( u1 "name" -- u2 ) \ X:structures
    3 + -4 and 4 +field ;

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: xfield: ( offset -- offset' )
    7 + -8 and 8 +field ;

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: field: ( u1 "name" -- u2 ) \ X:structures
    aligned cell +field ;

: 2field: ( u1 "name" -- u2 ) \ gforth
    aligned 2 cells +field ;

: ffield: ( u1 "name" -- u2 ) \ X:structures
    faligned 1 floats +field ;

: sffield: ( u1 "name" -- u2 ) \ X:structures
    sfaligned 1 sfloats +field ;

: dffield: ( u1 "name" -- u2 ) \ X:structures
    dfaligned 1 dfloats +field ;