59 lines
1.8 KiB
Forth
59 lines
1.8 KiB
Forth
\ Copyright 2022 Bradley D. Nelson
|
|
\
|
|
\ Licensed under the Apache License, Version 2.0 (the "License");
|
|
\ you may not use this file except in compliance with the License.
|
|
\ You may obtain a copy of the License at
|
|
\
|
|
\ http://www.apache.org/licenses/LICENSE-2.0
|
|
\
|
|
\ Unless required by applicable law or agreed to in writing, software
|
|
\ distributed under the License is distributed on an "AS IS" BASIS,
|
|
\ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
\ See the License for the specific language governing permissions and
|
|
\ limitations under the License.
|
|
|
|
( Vocabulary for building C-style structures )
|
|
|
|
vocabulary structures structures definitions
|
|
|
|
variable last-align
|
|
variable last-typer
|
|
: typer ( xt@ xt! sz "name" -- )
|
|
create dup , 1 max cell min , , ,
|
|
does> dup last-typer ! dup cell+ @ last-align ! @ ;
|
|
: sc@ ( a -- c ) c@ dup 127 > if 256 - then ;
|
|
' sc@ ' c! 1 typer i8
|
|
' c@ ' c! 1 typer u8
|
|
' sw@ ' w! 2 typer i16
|
|
' uw@ ' w! 2 typer u16
|
|
' sl@ ' l! 4 typer i32
|
|
' ul@ ' l! 4 typer u32
|
|
' @ ' ! 8 typer i64 ( Wrong on 32-bit! )
|
|
' @ ' ! cell typer ptr
|
|
long-size cell = [IF]
|
|
: long ptr ;
|
|
[ELSE]
|
|
: long i32 ;
|
|
[THEN]
|
|
|
|
variable last-struct
|
|
: struct ( "name" ) 0 0 0 typer latestxt >body last-struct !
|
|
1 last-align ! ;
|
|
: align-by ( a n -- a ) 1- dup >r + r> invert and ;
|
|
: max! ( n a -- ) swap over @ max swap ! ;
|
|
: struct-align ( n -- )
|
|
dup last-struct @ cell+ max!
|
|
last-struct @ @ swap align-by last-struct @ ! ;
|
|
: field ( n "name" )
|
|
last-align @ struct-align
|
|
create last-struct @ @ , last-struct @ +! last-typer @ ,
|
|
does> @ + ;
|
|
|
|
: field-op ( n "name" -- )
|
|
>r ' dup >body cell+ @ r> cells + @
|
|
state @ if >r , r> , else >r execute r> execute then ;
|
|
: !field ( n "name" -- ) 2 field-op ; immediate
|
|
: @field ( "name" -- n ) 3 field-op ; immediate
|
|
|
|
forth definitions
|