Common
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Chapter 12 /
Link
Technical Reference
Common segments of
the
same
name
and
class
name
are
loaded
overlapping one another. There
is only one canonical frame
for
all
common segments of
the
same
name. The length of
the
common
area
is the length of the longest
segment.
Placing segments
in
a group
in
the
assembler provides offset
addressing of items from a single canonical frame
for
all seg-
ments
in
that
group.
Segments
are
partitioned by declared class names. The linker
loads
the
segments belonging to
the
first class name encoun-
tered,
then
loads
all
the
segments of
the
next class name encoun-
tered,
and
so
on
until
all
classes
are
loaded.
If
your program contains:
r-",
l )
1'1
I ,
I i
,-,
I !
l _
~
I '
"
I I
I ,
L ,
r
l '
DS:DGROUP
Any number of other
segments can intervene
between segments of a
group.
Thus, the offset of
ZOO
can be
greater
than
the
size of segments
in
the group combined,
but
no
larger
than
64K.
A
B
C
D
E
XXXXOH
I
~
zool
SEGMENT
SEGMENT
SEGMENT
SEGMENT
SEGMENT
0-
relative offset
An
operand of
DGROUP
ZOO
in
assembly language
returns
the
offset of
ZOO
from
the
beginning of
the
first
segment
(Segment A here).
'ZOO'
'BAZ'
'BAZ'
'NEW'
'ZOO'
251
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