With and .endwith directives – Zilog ZUSBOPTS User Manual
Page 271
UM017105-0511
Directives
Zilog Developer Studio II – ZNEO™
User Manual
243
The .UNION directive has the following form:
[stag]
.UNION
[name_1]
DS
count1
[name_2]
DS
count2
[tname]
.TAG
stagx [count]
...
[name_n]
DS
count3
[ssize]
.ENDSTRUCT
[stag]
An example of the
.UNION
directive usage is:
BYTES .STRUCT
B0 DS 1
B1 DS 1
B2 DS 1
B3 DS 1
BSIZE .ENDSTRUCT BYTES
LONGBYTES .UNION
LDATA BLKL 1
BDATA .TAG BYTES
LSIZE .ENDSTRUCT LONGBYTES
.WITH and .ENDWITH Directives
Using the fully qualified names for fields within a structure can result in very long names.
The
.WITH
directive allows the initial part of the name to be dropped.
The
.WITH
and
.ENDWITH
directives have the following form:
.WITH
name
;
directives
.ENDWITH
[name]
The identifier name may be the name of a previously defined
.STRUCT
or
.UNION
, or an
ordinary label to which a structure has been attached using a
.TAG
directive. It can also be
the name of an equate or label with no structure attached. Within the
.WITH
section, the
assembler attempts to prepend “name.” to each identifier encountered, and selects the
modified name if the result matches a name created by the
.STRUCT
,
.UNION
, or
.TAG
directives.
The
.WITH
directives can be nested, in which case the search is from the deepest level of
nesting outward. In the event that multiple names are found, a warning is generated and
the first such name is used.