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da questo dispositivo ha anche altre istruzioni :
Facilità d'uso
When
the
compiler
places
the
RBMs
in
the
USL
le,
it
\asso
ciates"
them
with
particular
co de
segmen
ts.
Actual
co de
segmen
ts
do
not
y
et
exist,
but
y
ou
can
think
of
the
RBMs
as
\b elonging"
to
their
asso
ciated
segmen
ts.
The
RBMs
are
relo
catable,
whic
h
means
that
using
the
Segmen
ter
y
ou
can
mov
e
RBMs
around
and
asso
ciate
them
with
dieren
t
co de
segmen
ts.
Y
ou
can
also
cop
y
RBMs
from
other
USLs,
add
new
RBMs
to
a
USL,
or
purge
RBMs.
An
analogy
will
help
clarify
some
of
the
imp ortant
c
haracteristics
of
RBMs.
Suppose
y
ou
are
designing
p osters
for
a
presen
tation.
Eac
h
p oster
will
con
tain
one
or
more
pictures
or
diagrams.
Y
ou
lay
the
pictures
out
on
the
p oster
b oard
but
leav
e
them
unglued,
so
y
ou
can
rearrange
them
on
the
b oards
or
mov
e
them
from
b oard
to
b oard
as
often
as
y
ou
wish.
Once
they
are
glued
do
wn,
ho
w
ev
er,
their
p ositions
are
xed,
and
they
can
no
longer
b e
mov
ed
around.
Think
of
RBMs
as
the
diagrams
and
the
co de
segmen
t
names
as
the
p oster
b oard.
While
in
the
USL,
the
RBMs
can
b e
rearranged
and
asso
ciated
with
one
co de
segmen
t
name
(b oard)
or
another.
A
t
preparation
time,
the
Segmen
ter
lo
oks
at
the
curren
t
arrangement
and
applies
the
\glue"
to
form
the
nal
p oster,
or
co de
segmen
t,
whic
h
is
output
to
the
program
le.
Ho
w
ev
er,
unlik
e
the
pictures
whic
h
w
ere
glued
to
the
p oster
b oard,
the
pieces
of
co de
used
to
form
the
co de
segmen
ts
still
exist
in
the
USL,
w
aiting
to
b e
further
manipulated
or
c
hanged
in
another
cycle
of
segmen
t
design.
The
picture,
or
co de,
glued
in
to
the
co de
segmen
t
w
as
just
a
cop
y
of
the
co de
mo
dules
found
in
the
USL.
User
Subprogram
Libraries
(USLs)..
Users
often
think
of
co de
as
residing
only
in
program
les,
but
in
Hewlett-Pac
k
ard's
design
for
co de-handling,
co de
can
also
b e
stored,
maintained,
and
managed
in
three
dieren
t
kinds
of
sp ecially
formatted
les
called
\libraries."
The
user
subprogram
library
,
or
USL,
is
the
rst
of
the
pro cedure
libraries
used
in
the
program
dev
elopmen
t
pro cess.
It
is
the
le
used
for
compiler
output
and
forms
the
basis
for
the
other
t
w
o
libraries
(\Relo
catable
Libraries,"
or
RLs;
and
\Segmen
ted
Libraries,"
or
SLs).
The
USL
is
the
le
y
ou
can
manipulate
to
ac
hiev
e
eective
segmen
tation.
In
addition
to
an
RBM
for
the
main
program
and
eac
h
subprogram
successfully
compiled,
the
compiler
generates
and
places
the
following
in
to
the
USL:
A
directory
to
k
eep
track
of
the
RBMs
stored
in
the
USL.
Data
stack
information
that
will
b e
required
at
a
later
stage.
1-8
Introduction
T
o
The
Segmenter
DRAFT
2/11/100
10:13
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