| \ data structures (like C structs) |
\ data structures (like C structs) |
| |
|
| \ Copyright (C) 1995 Free Software Foundation, Inc. |
\ Copyright (C) 1995, 1997 Free Software Foundation, Inc. |
| |
|
| \ This file is part of Gforth. |
\ This file is part of Gforth. |
| |
|
| \ 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 ; |
| |
|
| : field ( offset1 align1 size align -- offset2 align2 ) |
: dozerofield ( -- ) |
| \ note: this version uses local variables |
\ a field that makes no change |
| [IFDEF] (Field) (Field) [ELSE] Header reveal dofield: cfa, [THEN] |
\ 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 @ |
| |
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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|
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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 ; |
| |
|
| : 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 ) |
| |
struct-allocate throw ; |
