| \ along with this program; if not, write to the Free Software |
\ along with this program; if not, write to the Free Software |
| \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| |
|
| |
: nalign ( addr1 n -- addr2 ) \ gforth |
| \ Usage example: |
\g @code{addr2} is the aligned version of @code{addr1} wrt the |
| \ |
\g alignment @code{n}. |
| \ struct |
|
| \ 1 cells: field search-method |
|
| \ 1 cells: field reveal-method |
|
| \ end-struct wordlist-map |
|
| \ |
|
| \ The structure can then be extended in the following way |
|
| \ wordlist-map |
|
| \ 1 cells: field enum-method |
|
| \ end-struct ext-wordlist-map \ with the fields search-method,...,enum-method |
|
| |
|
| : nalign ( addr1 n -- addr2 ) |
|
| \ addr2 is the aligned version of addr1 wrt the alignment size n |
|
| 1- tuck + swap invert and ; |
1- tuck + swap invert and ; |
| |
|
| : dozerofield ( -- ) |
: dozerofield ( -- ) |
| if |
if |
| immediate |
immediate |
| then |
then |
| does> ( -- ) |
does> ( name execution: -- ) |
| drop ; |
drop ; |
| |
|
| : field ( offset1 align1 size align "name" -- offset2 align2 ) \ gforth |
: field, ( align1 offset1 align size -- align2 offset2 ) |
| |
rot dup , ( align1 align size offset1 ) |
| |
+ >r nalign r> ; |
| |
|
| |
: create-field ( align1 offset1 align size -- align2 offset2 ) |
| |
create field, ; |
| |
|
| |
: field ( align1 offset1 align size "name" -- align2 offset2 ) \ gforth |
| \G name execution: ( addr1 -- addr2 ) |
\G name execution: ( addr1 -- addr2 ) |
| >r rot r@ nalign dup |
2 pick |
| if \ field offset <> 0 |
if \ field offset <> 0 |
| [IFDEF] (Field) |
[IFDEF] (Field) |
| (Field) |
(Field) |
| [THEN] |
[THEN] |
| else |
else |
| create dozerofield |
create dozerofield |
| then ( align1 size offset ) |
then |
| dup , + swap r> nalign ; |
field, ; |
| |
|
| : end-struct ( size align -- ) |
: end-struct ( align size "name" -- ) \ gforth |
| |
\g @code{name} execution: @code{addr1 -- addr1+offset1}@* |
| |
\g create a field @code{name} with offset @code{offset1}, and the type |
| |
\g given by @code{size align}. @code{offset2} is the offset of the |
| |
\g next field, and @code{align2} is the alignment of all fields. |
| |
over nalign \ pad size to full alignment |
| 2constant ; |
2constant ; |
| |
|
| 0 1 chars end-struct struct |
1 chars 0 end-struct struct ( -- align size ) \ gforth |
| |
\g an empty structure, used to start a structure definition. |
| \ : field ( offset1 align1 size align -- offset2 align2 ) |
|
| \ create-field |
|
| \ does> ( addr1 -- addr2 ) |
|
| \ @ + ; |
|
| |
|
| \ I don't really like the "type:" syntax. Any other ideas? - anton |
|
| \ Also, this seems to be somewhat general. It probably belongs to some |
|
| \ other place |
|
| : cells: ( n -- size align ) |
|
| cells cell ; |
|
| |
|
| : doubles: ( n -- size align ) |
|
| 2* cells cell ; |
|
| |
|
| : chars: ( n -- size align ) |
\ type descriptors |
| chars 1 chars ; |
1 aligned 1 cells 2constant cell% ( -- align size ) \ gforth |
| |
1 chars 1 chars 2constant char% ( -- align size ) \ gforth |
| : floats: ( n -- size align ) |
1 faligned 1 floats 2constant float% ( -- align size ) \ gforth |
| floats 1 floats ; |
1 dfaligned 1 dfloats 2constant dfloat% ( -- align size ) \ gforth |
| |
1 sfaligned 1 sfloats 2constant sfloat% ( -- align size ) \ gforth |
| : dfloats: ( n -- size align ) |
cell% 2* 2constant double% ( -- align size ) \ gforth |
| dfloats 1 dfloats ; |
|
| |
\ memory allocation words |
| : sfloats: ( n -- size align ) |
' drop alias %alignment ( align size -- align ) \ gforth |
| sfloats 1 sfloats ; |
\g the alignment of the structure |
| |
' nip alias %size ( align size -- size ) \ gforth |
| : struct-align ( size align -- ) |
\g the size of the structure |
| dp @ swap nalign dp ! |
|
| drop ; |
: %align ( align size -- ) \ gforth |
| |
\G align the data space pointer to the alignment @code{align}. |
| : struct-allot ( size align -- addr ) |
drop here swap nalign here - allot ; |
| over swap struct-align |
|
| |
: %allot ( align size -- addr ) \ gforth |
| |
\g allot @code{size} address units of data space with alignment |
| |
\g @code{align}; the resulting block of data is found at |
| |
\g @code{addr}. |
| |
tuck %align |
| here swap allot ; |
here swap allot ; |
| |
|
| : struct-allocate ( size align -- addr ior ) |
: %allocate ( align size -- addr ior ) \ gforth |
| drop allocate ; |
\g allocate @code{size} address units with alignment @code{align}, |
| |
\g similar to @code{allocate}. |
| : struct-alloc ( size align -- addr ) |
nip allocate ; |
| struct-allocate throw ; |
|
| |
: %alloc ( size align -- addr ) \ gforth |
| |
\g allocate @code{size} address units with alignment @code{align}, |
| |
\g giving a data block at @code{addr}; @code{throw}s an ior code |
| |
\g if not successful. |
| |
%allocate throw ; |
