<s>
A	O
high-level	B-Application
assembler	I-Application
in	O
computing	O
is	O
an	O
assembler	B-Language
for	O
assembly	B-Language
language	I-Language
that	O
incorporate	O
features	O
found	O
in	O
a	O
high-level	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
The	O
earliest	O
high-level	B-Application
assembler	I-Application
was	O
probably	O
Burroughs	O
 '	O
Executive	B-Language
Systems	I-Language
Problem	I-Language
Oriented	I-Language
Language	I-Language
(	O
ESPOL	B-Language
)	O
in	O
about	O
1960	O
,	O
which	O
provided	O
an	O
ALGOL-like	B-Language
syntax	O
around	O
explicitly-specified	O
Burroughs	O
B5000	O
machine	B-Language
instructions	I-Language
.	O
</s>
<s>
This	O
was	O
followed	O
by	O
Niklaus	O
Wirth	O
's	O
PL360	B-Language
in	O
1968	O
;	O
this	O
replicated	O
the	O
Burroughs	O
facilities	O
,	O
with	O
which	O
he	O
was	O
familiar	O
,	O
on	O
an	O
IBM	B-Application
System/360	I-Application
.	O
</s>
<s>
More	O
recent	O
high-level	B-Application
assemblers	I-Application
are	O
Borland	O
's	O
Turbo	B-Application
Assembler	I-Application
(	O
TASM	B-Application
)	O
,	O
Netwide	B-Application
Assembler	I-Application
(	O
NASM	B-Application
)	O
,	O
Microsoft	O
's	O
Macro	B-Application
Assembler	I-Application
(	O
MASM	B-Application
)	O
,	O
IBM	O
's	O
High	B-Device
Level	I-Device
Assembler	I-Device
(	O
HLASM	B-Device
)	O
for	O
z/Architecture	B-Device
systems	O
,	O
Alessandro	O
Ghignola	O
's	O
Linoleum	O
,	O
X#	O
used	O
in	O
Cosmos	O
and	O
Ziron	O
.	O
</s>
<s>
High-level	B-Application
assemblers	I-Application
typically	O
provide	O
instructions	O
that	O
directly	O
assemble	O
one-to-one	B-Algorithm
into	O
low-level	O
machine	B-Language
code	I-Language
as	O
in	O
any	O
assembler	B-Language
,	O
plus	O
control	O
statements	O
such	O
as	O
IF	O
,	O
WHILE	O
,	O
REPEAT	O
...	O
UNTIL	O
,	O
and	O
FOR	O
,	O
macros	O
,	O
and	O
other	O
enhancements	O
.	O
</s>
<s>
This	O
allows	O
the	O
use	O
of	O
high-level	O
control	O
statement	O
abstractions	O
wherever	O
maximal	O
speed	O
or	O
minimal	O
space	O
is	O
not	O
essential	O
;	O
low-level	O
statements	O
that	O
assemble	O
directly	O
to	O
machine	B-Language
code	I-Language
can	O
be	O
used	O
to	O
produce	O
the	O
fastest	O
or	O
shortest	O
code	O
.	O
</s>
<s>
The	O
end	O
result	O
is	O
assembly	O
source	O
code	O
that	O
is	O
far	O
more	O
readable	O
than	O
standard	O
assembly	B-Language
code	I-Language
while	O
preserving	O
the	O
efficiency	O
inherent	O
with	O
using	O
assembly	B-Language
language	I-Language
.	O
</s>
<s>
High-level	B-Application
assemblers	I-Application
generally	O
provide	O
information-hiding	O
facilities	O
and	O
the	O
ability	O
to	O
call	O
functions	O
and	O
procedures	O
using	O
a	O
high-level-like	O
syntax	O
(	O
i.e.	O
,	O
the	O
assembler	B-Language
automatically	O
produces	O
code	O
to	O
push	O
parameters	O
on	O
the	O
call	B-General_Concept
stack	I-General_Concept
rather	O
than	O
the	O
programmer	O
having	O
to	O
manually	O
write	O
the	O
code	O
to	O
do	O
this	O
)	O
.	O
</s>
<s>
High-level	B-Application
assemblers	I-Application
also	O
provide	O
data	O
abstractions	O
normally	O
found	O
in	O
high-level	B-Language
languages	I-Language
.	O
</s>
<s>
Examples	O
include	O
:	O
data	B-General_Concept
structures	I-General_Concept
,	O
unions	O
,	O
classes	O
,	O
and	O
sets	O
.	O
</s>
<s>
Some	O
high-level	B-Application
assemblers	I-Application
(	O
e.g.	O
,	O
TASM	B-Application
and	O
High	B-Application
Level	I-Application
Assembly	I-Application
(	O
HLA	O
)	O
)	O
support	O
object-oriented	B-Language
programming	I-Language
.	O
</s>
