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Beyond JVM
A tour of upcoming technologies
Reminders
• Green/yellow/red rating system after talk	

• Extended Q/A by blue chairs at 12:15	

• If not green…stop by and tell me why
Me
• Charles Oliver Nutter	

• Red Hat (yes, I have one; no, I don’t wear it)	

• JRuby and JVM languages	

• JVM hacking and spelunking	

• @headius
Goals
• Get you excited about the future of JVM	

• Show you there are very few unsolvables	

• Convince you to get involved
What is “JVM”?
• The JVM is software that runs JVM bytecode	

• Java, Scala, Groovy, JRuby, Clojure, …	

• OpenJDK contains Sun’s JVM “HotSpot”	

• Oracle’s JDK is based on OpenJDK	

• Many other JVMs exist for many platforms	

• Some just replace HotSpot
OSS JVMs
•
•
•
•
•
•
•
•
•

Avian	

Azul Zulu	

CACAO	

Dalvik	

GCJ	

HaikuVM	

HotSpot	


•
•
•
•
•
•
•

IcedTea	

IKVM.NET	


•

Jamiga	

JamVM	

Jaos	

Jato VM	

Jelatine JVM	

JESSICA	

Jikes RVM
(Jikes Research
Virtual
Machine)	

JOP	


•
•
•
•
•
•
•
•
•

Juice	

Jupiter	

JwiK	

Kaffe	

leDos	

MateVM	

Maxine	

Mika VM	

miniMV	


•
•
•
•
•

Mysaifu	


•
•
•
•

SuperWaba	


NanoVM	

RoboVM	

SableVM	

Squawk virtual
machine	


TakaTuka	

TinyVM.	

VM02
Why JVM?
Why Not JVM?
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
OpenJDK
OpenJDK Timeline
• For years, Sun’s JDK is closed source	

• Sun Microsystems starts OSS process in 2005	

• Official announcement at JavaOne 2006	

• HotSpot OSSed 12 Nov 2006	

• JDK OSSed 8 May 2007
A 2006 report prepared for the EU
by UNU-MERIT stated that Sun was
the largest corporate contributor to
open source movements in the
world.
According to this report, Sun's open
source contributions exceed the
combined total of the next five
largest commercial contributors.
Unfortunately…
Sun Becomes Oracle
• Sun broke open the OSS piñata	

• Java, Solaris, OpenOffice, NetBeans,
VirtualBox, ZFS, Dtrace, and more	


• Unable to capitalize on OSS	

• Hardware can’t make up the difference	

• Oracle takes over Sun…oh no!!!
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
Java SE 7 Updates
Time since last release

New numbering
90

Flurry of exploits
67.5

45

22.5

9mo of security releases
0

45

7u

40

7u

25

7u

21

7u

17

7u

15

7u

13

7u

11

7u

10

7u

9

7u

7

7u

6

7u

5

7u

4

7u

3

7u

2

7u

1

7u
The OpenJDK landscape looks different
this year. Oracle's complete grip on
OpenJDK is slowly loosening. They're
still the dominant player and perhaps
always will be, but things are more level
than they were.!
!

- Andrew Haley of Red Hat!
!

Upon nomination to the OpenJDK
governing board for 2013
Truths of OpenJDK
• It is really truly OSS, under GPL+CPE	

• You can fork it	

• You can distribute builds of it	

• You can contribute to it	

• Oracle is learning how to do OSS
Beyond JVM - YOW Melbourne 2013
Java 5 was released	

September 30, 2004
Java 6 was released	

December 11, 2006
Java 7 was released	

July 28, 2011
Java 7 Features
• Strings in switch statements	

• More numeric literal forms	

• Type inference for generic instances	

• try-with-resources statement	

• Multiple-catch
    static String chooseGreeting(String language) {"
        switch (language) {"
            case "Java": return "I love to hate you!";"
            case "Scala": return "I love you, I think!";"
            case "Clojure": return "(love I you)";"
            case "Groovy": return "I love ?: you";"
            case "Ruby": return "I.love? you # => true";"
            default: return "Who are you?";"
        }"
    }
Java 8 Features
• Lambda expressions	

• Type annotations
Java 8 Features

•

Lambda expressions	


• Type annotations
public static void doSort(List<String> input) {"
Collections.sort(input,!
(a,b)->Integer.compare(a.length(), b.length()));"
}"
"
public static String getInitials(List<String> input) {"
return input.stream()"
.map(x->x.substring(0,1))"
.collect(Collectors.joining());"
}
Java 9 Features?
• Modularization?	

• Dynamic invocation?	

• Value types?	

• Reified generics?	

• Coroutines? (working patch available!)	

• Tail calls? (working patch available!)
Alternative Languages
High-Profile Languages
• Clojure	

• Groovy	

• Scala	

• JRuby
Newcomers
• Kotlin	

• Ceylon	

• Xtend	

• Mirah
Classics
• Jython	

• Rhino	

• BeanShell
Ported Languages
•
•
•
•
•
•
•
•
•

Ada	

AWK	

BASIC	

BBx	

Boo	

C	

COBOL	

ColdFusion	

Railo	


•

Open
BlueDragon	


•

Common
Lisp	


•

Component
Pascal	


•
•
•
•

Erlang	

Forth	

Go	

Haxe	


•
•
•
•
•
•
•
•
•

JavaScript	

Logo	

Lua	

Yeti ML	

Oberon-2	

OCaml	

Object Pascal	

PHP	

Prolog	


•
•
•
•
•
•
•

Python	

R	

REXX	

Ruby	

Scheme	

Smalltalk	

Tcl
New Languages
•
•
•
•
•
•
•
•
•
•
•

Alef++	

Ateji PX	

BBj	

BeanShell	

Ceylon	

CAL	

E	

Fantom	

Flow Java.	

Fortress	

Frege	


•
•
•
•
•
•
•
•
•
•
•

Frink	

Golo	

Gosu	

Hecl	

Ioke	

KBML	

Kotlin	

Jabaco	

Jaskell	

Jelly	

Join Java	


•
•
•
•
•
•
•
•
•
•
•

Joy	

Judoscript	

Libretto.	

Mirah	

N.A.M.E. Basic.	

NetLogo	

Nice	

Noop	

ObjectScript	

PHP.reboot	

Pizza	


•
•
•
•
•
•
•
•

Pnuts	

Processing	

Stab	

Sleep	

V	

X10	

Xtend	

Zest
JVM is not just Java
Beyond JVM - YOW Melbourne 2013
Native Interop
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
User Code

Java

JNI call

C/native

JNI impl
Target Library
JNI
public class GetPidJNI {"
public static native long getpid();"
"
public static void main( String[] args ) {"
getpid();"
}"
"
static {"
System.load(!
System.getProperty("user.dir") +!
"/getpidjni.dylib");"
}"
}
JNI
/* DO NOT EDIT THIS FILE - it is machine generated */"
#include <jni.h>"
/* Header for class com_headius_jnr_presentation_GetPidJNI */"
 "
#ifndef _Included_com_headius_jnr_presentation_GetPidJNI"
#define _Included_com_headius_jnr_presentation_GetPidJNI"
#ifdef __cplusplus"
extern "C" {"
#endif"
/*"
* Class:
com_headius_jnr_presentation_GetPidJNI"
* Method:
getpid"
* Signature: ()J"
*/"
JNIEXPORT jlong JNICALL Java_com_headius_jnr_1presentation_GetPidJNI_getpid"
(JNIEnv *, jclass);"
 "
#ifdef __cplusplus"
}"
#endif"
#endif
JNI
#include "com_headius_jnr_presentation_GetPidJNI.h""
 "
jlong JNICALL Java_com_headius_jnr_1presentation_GetPidJNI_getpid"
(JNIEnv *env, jclass c) {"
 "
return getpid();"
}
JNI
$ gcc -I $JAVA_HOME/include -I
$JAVA_HOME/include/darwin -L
$JAVA_HOME/jre/lib/ -dynamiclib -ljava
-o getpidjni.dylib
com_headius_jnr_presentation_GetPidJNI.
c"
!

$ java -Djava.library.path=`pwd` -cp
target/jnr_presentation-1.0SNAPSHOT.jar
com.headius.jnr_presentation.GetPidJNI
Nobody enjoys calling
native libraries...
...but if you have to call
native libraries, you
might as well enjoy it.
Java Native Runtime
• Java API	

• for calling Native code	

• supported by a rich Runtime library	

• You may be familiar with JNA 	

• Foreign Function Interface (FFI)	

• https://github.com/jnr	

• Maven artifacts for everything
A Java API for binding
native libraries and
native memory
Justifications
• NIO, NIO.2	

• Native IO, symlinks, FS-walking, 	

• Unmanaged memory	

• Selectable stdio, process IO	

• Low-level or other sockets (UNIX, ICMP, ...)	

• New APIs (graphics, crypto, OS, ...)
User Code

Java

JNI call

C/native

JNI impl
Target Library
User Code

Java

JNI call

C/native

JNI impl
Target Library
User Code
JNR stub

Java

JNI call

C/native

JNI impl
libffi
Target Library
JNR
import jnr.ffi.LibraryLoader;"
import jnr.ffi.annotations.IgnoreError;"
 "
public class GetPidJNRExample {"
public interface GetPid {"
long getpid();"
}"
"
public static void main( String[] args ) {"
GetPid getpid = LibraryLoader"
.create(GetPid.class)!
.load("c");"
"
getpid.getpid();"
}"
}
Layered Runtime
etc etc
jnr-posix	


jnr-unixsocket!
jnr-enxio

jnr-constants

jnr-ffi
jffi
libffi

jnr-x86asm
JNR Platforms
• Darwin (OS X): universal (+ppc?)	

• Linux: i386, x86_64, arm, ppc, ppc64, s390x	

• Windows: i386, x86_64	

• FreeBSD, OpenBSD: i386, x86_64	

• SunOS: i386, x86_64, sparc, sparcv9	

• AIX: ppc	

• OpenVMS, AS/400: builds out there somewhere	

• If your platform isn't here, contribute a build
jnr-ffi
• User-oriented API	

• Roughly equivalent to what JNA gives you	

• Functions, structs, callbacks, memory	

• https://github.com/jnr/jnr-ffi
jnr-ffi
import jnr.ffi.LibraryLoader;"
import jnr.ffi.annotations.IgnoreError;"
 "
public class GetPidJNRExample {"
public interface GetPid {"
long getpid();"
}"
"
public static void main( String[] args ) {"
GetPid getpid = LibraryLoader"
.create(GetPid.class)!
.load("c");"
"
getpid.getpid();"
}"
}
jnr-posix
• Pre-bound set of POSIX functions	

• Mostly driven by what JRuby, Jython use	

• Goal: 100% of POSIX bound to Java
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
public
List<?

int chmod(String string, int i);"
int chown(String string, int i, int i1);"
int execv(String string, String[] strings);"
int execve(String string, String[] strings, String[] strings1);"
int fork();"
int seteuid(int i);"
int getgid();"
String getlogin();"
int getpgid();"
int getpgid(int i);"
int getpgrp();"
int getpid();"
int getppid();"
Passwd getpwent();!
Passwd getpwuid(int i);!
Passwd getpwnam(String string);"
Group getgrgid(int i);!
Group getgrnam(String string);"
int getuid();!
boolean isatty(FileDescriptor fd);"
int kill(int i, int i1);!
int symlink(String string, String string1);"
int link(String string, String string1);"
String readlink(String string) throws IOException;"
String getenv(String string);"
int setenv(String string, String string1, int i);"
int unsetenv(String string);"
int getpriority(int i, int i1);"
int setpriority(int i, int i1, int i2);"
int setuid(int i);"
FileStat stat(String string);"
int stat(String string, FileStat fs);"
int umask(int i);"
Times times();"
int utimes(String string, long[] longs, long[] longs1);"
int waitpid(int i, int[] ints, int i1);"
int wait(int[] ints);"
int errno();"
void errno(int i);"
int posix_spawnp(String string, List<? extends SpawnFileAction> list,
extends CharSequence> list1, List<? extends CharSequence> list2);
POSIX posix = POSIXFactory.getPOSIX(!
new MyPOSIXHandler(this),"
isNativeEnabled);
public interface POSIXHandler {!
public void error(Errno errno, String string);"
public void unimplementedError(String string);!
public void warn(WARNING_ID wrngd, String string, Object[] os);"
public boolean isVerbose();!
public File getCurrentWorkingDirectory();!
public String[] getEnv();!
public InputStream getInputStream();!
public PrintStream getOutputStream();!
public int getPID();!
public PrintStream getErrorStream();"
}
jnr-enxio
• Extended Native X-platform IO	

• NIO-compatible JNR-backed IO library	

• Read, write, select (kqueue, epoll, etc)	

• Low-level fcntl control	

• https://github.com/jnr/jnr-enxio
public class NativeSocketChannel"
extends AbstractSelectableChannel"
implements ByteChannel, NativeSelectableChannel {"
public NativeSocketChannel(int fd);!
public NativeSocketChannel(int fd, int ops);!
public final int validOps();!
public final int getFD();!
public int read(ByteBuffer dst) throws IOException;"
public int write(ByteBuffer src) throws IOException"
public void shutdownInput() throws IOException;"
public void shutdownOutput() throws IOException;!
}
jnr-unixsocket
• UNIX sockets for NIO	

• Built atop jnr-enxio	

• Fully selectable, etc	

• https://github.com/jnr/jnr-unixsocket
How Does It Perform?
JNA getpid

JNR getpid

getpid calls, 100M times
100000ms
10000ms
1000ms
100ms
10ms
1ms
@IgnoreError
import jnr.ffi.LibraryLoader;"
import jnr.ffi.annotations.IgnoreError;"
 "
public class GetPidJNRExample {"
public interface GetPid {"
@IgnoreError"
long getpid();"
}"
"
public static void main( String[] args ) {"
GetPid getpid = LibraryLoader"
.create(GetPid.class)!
.load("c");"
"
getpid.getpid();"
}"
}
JNR getpid

JNR getpid @IgnoreError
getpid calls, 100M times

2000ms

1500ms

1000ms

500ms

0ms
But There's More to Do
JNR getpid

JNI

JNR @IgnoreError
getpid calls, 100M times

2000ms
1500ms
1000ms
500ms
0ms

GCC -O3
JVM Help is Coming
• Standard FFI API in JDK	

• JIT intelligence	

• Drop JNI overhead where possible	

• Bind native call directly at call site	

• Security policies, segv protection, etc	

• Time for an FFI JSR
Recap
• OpenJDK is awesome	

• Java is evolving	

• JVM languages are everywhere	

• Even native code is accessible
27 April, 2011
History
• JVM authors mentioned non-Java languages	

• Language authors have targeted JVM	

• Hundreds of JVM languages now	

• But JVM was a mismatch for many of them	

• Usually required tricks that defeated JVM
optimizations	


• Or required features JDK could not provide
What is
invokedynamic
JVM
Opcodes
Invocation	


Field Access	


invokevirtual"
invokeinterface"
invokestatic"
invokespecial

getfield"
setfield"
getstatic"
setstatic

Stack

Flow Control

Boolean and Numeric

Array Access	

*aload"
*astore"
b,s,c,i,l,d,f,a

Local Vars

Allocation
Beyond JVM - YOW Melbourne 2013
Goals of JSR 292
• A user-definable bytecode	

• Full freedom to define VM behavior	

• Fast method pointers + adapters	

• Optimizable like normal Java code	

• Avoid future modifications
A User-definable
Bytecode
You decide how the JVM implements it

+
Method Pointers
and Adapters
Faster than reflection, with user-defined	

argument, flow, and exception handling
invokedynamic opcode
user-def’d bytecode

method pointers
MethodHandles

invokedynamic
Method Invocation
VM Operations	

Method Lookup	

Type Checking	

Branch	

Method Cache

obj.foo()

Target	

Object
JVM

Call Site

instanceof

Object’s	

Class
void foo()

void foo()
static void bar()
// Static"
System.currentTimeMillis()"
Math.log(1.0)"
 "
// Virtual"
"hello".toUpperCase()"
System.out.println()"
 "
// Interface"
myList.add("happy happy")"
myRunnable.run()"
 "
// Special"
new ArrayList()"
super.equals(other)
// Static"
invokestatic java/lang/System.currentTimeMillis:()J"
invokestatic java/lang/Math.log:(D)D"
!
// Virtual"
invokevirtual java/lang/String.toUpperCase:()Ljava/lang/String;"
invokevirtual java/io/PrintStream.println:()V"
!
// Interface"
invokeinterface java/util/List.add:(Ljava/lang/Object;)Z"
invokeinterface java/lang/Runnable.add:()V"
!
// Special"
invokespecial java/util/ArrayList.<init>:()V"
invokespecial java/lang/Object.equals:(java/lang/Object)Z
invokevirtual"
1. Confirm object is of correct type	

2. Confirm arguments are of correct type	

3. Look up method on Java class	

invokestatic
4. Cache method	

5. Invoke method

invokestatic"
1. Confirm arguments are of correct type	

2. Look up method on Java class	

3. Cache method	

4. Invoke method

invokevirtual
invokeinterface"
1. Confirm object’s type implements interface	

2. Confirm arguments are of correct type	

3. Look up method on Java class	

invokeinterface
4. Cache method	

5. Invoke method

invokespecial"
1. Confirm object is of correct type	

2. Confirm arguments are of correct type	

3. Confirm target method is visible	

4. Look up method on Java class	

5. Cache method	

6. Invoke method

invokespecial
invokedynamic!
1. Call bootstrap handle (your code)	

2. Bootstrap prepares CallSite + MethodHandle	

3. MethodHandle invoked now and future (until CallSite changes)
invokedynamic bytecode
target method

bo
ot
st

ra
p

m

et
ho
d

method handles
How Do You Benefit?
Indy Languages
• New language impls	

• JavaScript: Dyn.js and Nashorn	

• Redline Smalltalk	

• Improved language performance	

• JRuby, Groovy, Jython	

• Java features too!
JRuby/Java 6

JRuby/Java 7

Times Faster than Ruby 1.9.3
5
4.32

3.75

3.66
3.44

2.5

2.658

1.914

1.25

0

1.346

base64

1.565

1.538

richards

neural

redblack
red/black tree, pure Ruby versus native

ruby-2.0.0 + Ruby

2.48s

ruby-2.0.0 + C ext

0.51s

jruby + Ruby

0.29s

0

0.75

1.5
Runtime per iteration

2.25

3
Caveat Emptor
• Indy was really slow in first Java 7 release	

• Got fast in 7u2...and turned out broken	

• Rewritten for 7u40	

• Slow to warm up	

• Still some issues (memory use, etc)	

• Java 8 due in March…
Feeling Helpless?
JVM
Language

JVM
Bytecode

Out of our control	

Written in C++

Bytecode
Interpreter

Bytecode
JIT

Native
Code
What If…
• The JVM’s JIT optimizer were written in Java	

• You could customize how the JIT works for
your language or library	


• JITed code could directly make native calls
Graal
• A 100% Java-based JIT framework	

• Grew out of the 100% Java “Maxine” JVM	

• Backends to assembly or HotSpot IR	

• Directly control code generation	

• Build a language without using JVM bytecode	

• http://openjdk.java.net/projects/graal/
JVM
Language
Plain Java APIs

Graal	

Intermediate
Representation

Graal
Optimizer

Under your control

Your
Transformations

Your
Optimizations

Native
Code
However…
• Not everyone is a compiler writer	

• Graal’s IR is low-level and nontrivial	

• Need to understand JVM internals	

• Need some understanding of CPU
The Dream
• Design your language	

• ???	

• PROFIT
Without JVM
• Design your language	

• Work out memory model	

• Create an optimizing compiler	

• Spend ten years debugging it	

• PROFIT
With JVM
• Design your language	

• Maybe write an interpreter	

• Compile to JVM bytecode	

• Pray that the JVM optimizes it right	

• PROFIT
What We Want
• Design your language	

• ???	

• PROFIT
What We Want
• Design your language	

• Write an interpreter	

• PROFIT
Truffle
• Language framework built on Graal	

• Designed to fulfill the dream	

• Implement interpreter	

• Truffle feeds that to backend	

• No compiler expertise needed	


• https://wiki.openjdk.java.net/display/Graal/Truffle+FAQ+and+Guidelines
Traditional Approach
Guest Language
AST interpreter in pure Java

Custom made bytecode compiler
Bytecode emitted by guest language

Any JVM
Truffle Atop JVM
Guest Language
AST interpreter in pure Java

Truffle
Bytecode based on interpreter flow

Any JVM
Truffle Atop Graal
Guest Language
AST interpreter in pure Java

Truffle
Direct access to compiler internals,	

IR, machine code cache,	

on stack replacement, etc etc

Graal JVM
Beyond JVM - YOW Melbourne 2013
Beyond JVM - YOW Melbourne 2013
The Final Word
• JVM is a powerful platform	

• Java and other languages are evolving	

• The JVM is adapting to our needs	

• New tools breaking JVM’s boundaries
Thank you!
• Charles Oliver Nutter	

• @headius, headius@headius.com	

• http://blog.headius.com

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Beyond JVM - YOW Melbourne 2013