<s>
Project	B-Language
Valhalla	I-Language
is	O
an	O
experimental	O
OpenJDK	B-Language
project	O
to	O
develop	O
major	O
new	O
language	O
features	O
for	O
Java	B-Language
10	O
and	O
beyond	O
.	O
</s>
<s>
The	O
project	O
was	O
announced	O
in	O
July	O
2014	O
and	O
is	O
an	O
experimental	O
effort	O
by	O
Oracle	B-Application
,	O
led	O
by	O
engineer	O
Brian	O
Goetz	O
.	O
</s>
<s>
Valhalla	O
is	O
incubating	O
Java	B-Language
language	I-Language
features	O
and	O
enhancements	O
in	O
these	O
areas	O
:	O
</s>
<s>
improved	O
'	O
volatile	B-Operating_System
 '	O
support	O
.	O
</s>
<s>
The	O
project	O
is	O
organized	O
on	O
the	O
OpenJDK	B-Language
'	O
Project	B-Language
Valhalla	I-Language
 '	O
mailing	O
list	O
.	O
</s>
<s>
Project	B-Language
Valhalla	I-Language
has	O
begun	O
in	O
the	O
experimental	O
stages	O
,	O
with	O
an	O
inaugural	O
announcement	O
&	O
early	O
draft	O
initial	O
proposals	O
.	O
</s>
<s>
Experimental	O
OpenJDK	B-Language
prototypes	O
can	O
also	O
be	O
built	O
from	O
the	O
Mercurial	O
repositories	O
.	O
</s>
<s>
Note	O
that	O
these	O
are	O
Gnu	O
Make/	O
C++	O
sources	O
,	O
and	O
building	O
the	O
OpenJDK	B-Language
requires	O
technical	O
expertise	O
.	O
</s>
<s>
Value	O
classes	O
are	O
reference	O
types	O
,	O
in	O
the	O
same	O
way	O
as	O
all	O
existing	O
Java	B-Language
classes	O
.	O
</s>
<s>
The	O
Java	B-Language
Virtual	O
Machine	O
is	O
expected	O
to	O
be	O
able	O
to	O
take	O
advantage	O
of	O
the	O
additional	O
constraints	O
of	O
value	O
classes	O
to	O
eliminate	O
heap	O
allocation	O
of	O
value	O
types	O
in	O
the	O
vast	O
majority	O
of	O
cases	O
.	O
</s>
<s>
Existing	O
types	O
in	O
the	O
Java	B-Language
API	O
such	O
as	O
are	O
known	O
as	O
value-based	O
classes	O
,	O
and	O
are	O
candidates	O
for	O
being	O
made	O
into	O
value	O
classes	O
in	O
a	O
future	O
JDK	O
release	O
.	O
</s>
<s>
This	O
JEP	O
is	O
meant	O
to	O
express	O
the	O
classical	O
primitive	O
types	O
of	O
the	O
Java	B-Language
Virtual	O
Machine	O
(	O
byte	O
,	O
char	O
,	O
short	O
,	O
int	O
,	O
long	O
,	O
boolean	O
,	O
float	O
,	O
double	O
)	O
as	O
Primitive	O
Classes	O
.	O
</s>
<s>
Instead	O
of	O
a	O
list	O
or	O
array	O
of	O
object	O
references	O
,	O
pointing	O
to	O
data	O
values	O
scattered	O
throughout	O
memory	O
,	O
Project	B-Language
Valhalla	I-Language
enhancements	O
will	O
enable	O
list	O
or	O
array	O
values	O
to	O
potentially	O
be	O
laid	O
out	O
linearly	O
—	O
without	O
indirection	O
—	O
as	O
a	O
consecutive	O
block	O
of	O
memory	O
.	O
</s>
