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Project Panama - Beyond the (JVM) Wall

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Christoph Engelbert
Christoph Engelbert

The days of JNI is counted, Project Panama is on the rise to tear down the walls between Java and C/C++ forever. FFI (Foreign Function Interface) technology finally arrives into the Java world.

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https://middleofnowheregaming.files.wordpress.com/2015/04/game-of-thrones_20150327091828.jpg Project Panama Beyond the (JVM) Wall
www.hazelcast.com@noctarius2k Disclaimer This is not a rant - promised! Just a little bit about JNI ;-)
www.hazelcast.com@noctarius2k Disclaimer #2 If you haven’t seen Game of Thrones yet
 keep your eyes closed!
www.hazelcast.com@noctarius2k Disclaimer #3 Everything is provisional Don’t take anything as final!
www.hazelcast.com@noctarius2k Who’s that dude? • Chris Engelbert • Manager of Developer Relations @Hazelcast • Java-Passionate (10+ years) • Performance • Garbage Collection • JVM / Benchmark Fairytales
www.hazelcast.com@noctarius2k I drink and I know things (sometimes)
www.hazelcast.com@noctarius2k Project Panama The True Native Love
www.hazelcast.com@noctarius2k Unite Enemies C/C++Java
www.hazelcast.com@noctarius2k JNI! That's a good name for you!
www.hazelcast.com@noctarius2k JNI brings interaction between native code and Java #include <unistd.h> int pid = getpid(); simple kernel call
www.hazelcast.com@noctarius2k JNI brings interaction between native code and Java #include <unistd.h> int pid = getpid(); simple kernel call header import
www.hazelcast.com@noctarius2k JNI brings interaction between native code and Java #include <unistd.h> int pid = getpid(); simple kernel call header import request PID
www.hazelcast.com@noctarius2k #include <unistd.h> int pid = getpid(); Isn’t that easy in C?
www.hazelcast.com@noctarius2k You know nothing, of JNI!
www.hazelcast.com@noctarius2k Starting with the C part :-)
www.hazelcast.com@noctarius2k Starting with the C part :-) extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); }
www.hazelcast.com@noctarius2k Starting with the C part :-) extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } export it as a JNI method
www.hazelcast.com@noctarius2k Starting with the C part :-) extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } export it as a JNI method Java Classname
www.hazelcast.com@noctarius2k Starting with the C part :-) extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } export it as a JNI method Java Classname Java Methodname
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } Starting with the C part :-) JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); }
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } Starting with the C part :-) JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } kernel call
www.hazelcast.com@noctarius2k When you think you just won…
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } Starting with the C part :-) JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; }
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } Starting with the C part :-) JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; } JNI version definition
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } done, easy right? JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; }
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } oh, missing the Java side, still JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; } public class ProcessIdentifier { static { System.loadLibrary("processidentifier"); } public native void getProcessId(); }
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } oh, missing the Java side, still JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; } public class ProcessIdentifier { static { System.loadLibrary("processidentifier"); } public native void getProcessId(); } Java Classname
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } oh, missing the Java side, still JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; } public class ProcessIdentifier { static { System.loadLibrary("processidentifier"); } public native void getProcessId(); } Java Classname Java Methodname
www.hazelcast.com@noctarius2k extern C { JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *, jobject); } JNIEXPORT int JNICALL Java_ProcessIdentifier_getProcessId(JNIEnv *env, jobject thisObject) { return getpid(); } ok, ok, now we’re done! JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved) { return JNI_VERSION_1_2; } public class ProcessIdentifier { static { System.loadLibrary("processidentifier"); } public native void getProcessId(); }
www.hazelcast.com@noctarius2k Wasn’t that easy?
www.hazelcast.com@noctarius2k Wasn’t that easy? but remember…
www.hazelcast.com@noctarius2k Everybody struggles with JNI!
www.hazelcast.com@noctarius2k meanwhile behind
 the wall…
www.hazelcast.com@noctarius2k Java 9 to the rescue
www.hazelcast.com@noctarius2k Java 9 to the rescue long pid = ProcessHandle.current().getPid();
www.hazelcast.com@noctarius2k Java 9 to the rescue long pid = ProcessHandle.current().getPid(); convenient, eh?
www.hazelcast.com@noctarius2k but how many can just update?
www.hazelcast.com@noctarius2k So? JNI?
www.hazelcast.com@noctarius2k So? JNI? - NO!
www.hazelcast.com@noctarius2k A Song From Methods And Handles
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact();
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); type definition
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); returntypetype definition
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); returntypetype definition Java Classname
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); returntypetype definition Java Classname Java Methodname
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); returntypetype definition Java Classname Java Methodnamecall the new callsite
www.hazelcast.com@noctarius2k MethodHandles So? What’s the deal? Java 7, right?
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact();
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findVirtual(ProcessIdentifier.class, "getProcessId", type); int pid = mh.invokeExact(); virtual call
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findNative(null, "getpid", type); int pid = mh.invokeExact(); native
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findNative(null, "getpid", type); int pid = mh.invokeExact(); native native call
www.hazelcast.com@noctarius2k MethodHandles MethodType type = MethodType.methodType(int.class); MethodHandle mh = MethodHandles.lookup() .findNative(null, "getpid", type); int pid = mh.invokeExact(); native native call null = kernel call
 otherwise lib name
www.hazelcast.com@noctarius2k Easier than taking the Iron Throne!
www.hazelcast.com@noctarius2k The Mad King
www.hazelcast.com@noctarius2k Pointer with sun.misc.Unsafe Unsafe unsafe = getUnsafeWithMagic(); long ptr = unsafe.allocateMemory(20); byte val = unsafe.getByte(ptr + 5);
www.hazelcast.com@noctarius2k Pointer with sun.misc.Unsafe Unsafe unsafe = getUnsafeWithMagic(); long ptr = unsafe.allocateMemory(20); byte val = unsafe.getByte(ptr + 5); retrieve sun.misc.Unsafe instance
www.hazelcast.com@noctarius2k Pointer with sun.misc.Unsafe Unsafe unsafe = getUnsafeWithMagic(); long ptr = unsafe.allocateMemory(20); byte val = unsafe.getByte(ptr + 5); retrieve sun.misc.Unsafe instance allocate 20 bytes
www.hazelcast.com@noctarius2k Pointer with sun.misc.Unsafe Unsafe unsafe = getUnsafeWithMagic(); long ptr = unsafe.allocateMemory(20); byte val = unsafe.getByte(ptr + 5); retrieve sun.misc.Unsafe instance allocate 20 bytesget byte at ptr+5
www.hazelcast.com@noctarius2k So I die, for using Unsafe?
www.hazelcast.com@noctarius2k Who needs Unsafe anyways LayoutType<Byte> layout = NativeLibrary.createLayout(byte.class); try (Scope scope = new NativeScope()) { Pointer<Byte> p = scope.allocate(layout, 20); Reference<Byte> ref = p.offset(5).deref(); byte val = ref.get(); }
www.hazelcast.com@noctarius2k Who needs Unsafe anyways LayoutType<Byte> layout = NativeLibrary.createLayout(byte.class); try (Scope scope = new NativeScope()) { Pointer<Byte> p = scope.allocate(layout, 20); Reference<Byte> ref = p.offset(5).deref(); byte val = ref.get(); } byte-array layout
www.hazelcast.com@noctarius2k Who needs Unsafe anyways LayoutType<Byte> layout = NativeLibrary.createLayout(byte.class); try (Scope scope = new NativeScope()) { Pointer<Byte> p = scope.allocate(layout, 20); Reference<Byte> ref = p.offset(5).deref(); byte val = ref.get(); } byte-array layout create a scope
www.hazelcast.com@noctarius2k Who needs Unsafe anyways LayoutType<Byte> layout = NativeLibrary.createLayout(byte.class); try (Scope scope = new NativeScope()) { Pointer<Byte> p = scope.allocate(layout, 20); Reference<Byte> ref = p.offset(5).deref(); byte val = ref.get(); } byte-array layout create a scope allocate
 20 bytes
www.hazelcast.com@noctarius2k Who needs Unsafe anyways LayoutType<Byte> layout = NativeLibrary.createLayout(byte.class); try (Scope scope = new NativeScope()) { Pointer<Byte> p = scope.allocate(layout, 20); Reference<Byte> ref = p.offset(5).deref(); byte val = ref.get(); } byte-array layout create a scope allocate
 20 bytes get byte
 at ptr+5
www.hazelcast.com@noctarius2k Who needs Unsafe anyways
www.hazelcast.com@noctarius2k Who needs Unsafe anyways
www.hazelcast.com@noctarius2k A REAL NULL POINTER! THANK YOU JAVA! Who needs Unsafe anyways
www.hazelcast.com@noctarius2k About Structs and other Creatures
www.hazelcast.com@noctarius2k Struct in Java? No, Layout! typedef struct { int32_t val; Node next; } Node;
www.hazelcast.com@noctarius2k Same LinkedList Node in Java @LayoutDesc({"x:jint:4", "y:Node:8"}) public interface Node extends Layout { // … }
www.hazelcast.com@noctarius2k @LayoutDesc({"x:jint:4", "y:Node:8"}) public interface Node extends Layout { interface EffectiveAddress { IntPointer val(); Pointer<Node> next(); } // … } Same LinkedList Node in Java
www.hazelcast.com@noctarius2k @LayoutDesc({"x:jint:4", "y:Node:8"}) public interface Node extends Layout { Node.EffectiveAddress EA(); long sizeof(); int val(); // … } Same LinkedList Node in Java
www.hazelcast.com@noctarius2k @LayoutDesc({"x:jint:4", "y:Node:8"}) public interface Node extends Layout { Node next(); void val(int val); void next(Node next); String toString(); } Same LinkedList Node in Java
www.hazelcast.com@noctarius2k Scope scope = new NativeScope(); Pointer<Node> ptr = scope.allocate(Node.class); Node node = ptr.getLayout(); int val = node.val(); Node next = node.next(); Creating layouted Objects
www.hazelcast.com@noctarius2k I slayed the Mad King
www.hazelcast.com@noctarius2k Value Isn’t A Pit. Value Is A Ladder.
www.hazelcast.com@noctarius2k Value Types value class Point { int x; int y; }
www.hazelcast.com@noctarius2k Value Types Point point = __make Point(1, 2); int x = point.x; int y = point.y;
www.hazelcast.com@noctarius2k Yet another layout?
www.hazelcast.com@noctarius2k class Point {} Point[] points = … Arrays of Points
www.hazelcast.com@noctarius2k value class Point {} Point[] points = … Arrays of Points
www.hazelcast.com@noctarius2k I’m feeling so Assembler today
www.hazelcast.com@noctarius2k Coding a Vector-Function in Java MethodType type = MethodType.methodType( Float.class, Float.class, Float.class); MethodHandle m256_vadds = CodeSnippets .make(..., type, …); m256_vadds.invokeExact(out, in1, in2); low-level
www.hazelcast.com@noctarius2k Coding a Vector-Function in Java high-level interface Vector<E, S extends Shape<Vector?, S>> { Vector<E, S> add (Vector<E, S> other); Vector<E, S> mul (Vector<E, S> other); Vector<E, S> and (Vector<E, S> other); // ... more operations }
www.hazelcast.com@noctarius2k Coding a Vector-Function in Java high-level void addVector(float[] left, float[] right, float[] res, int length) { // … }
www.hazelcast.com@noctarius2k Coding a Vector-Function in Java high-level void addVector(float[] left, float[] right, float[] res, int length) { FloatVector<S256Bit> l = float256FromArray(left, length); FloatVector<S256Bit> r = float256FromArray(right, length); // … }
www.hazelcast.com@noctarius2k Coding a Vector-Function in Java high-level void addVector(float[] left, float[] right, float[] res, int length) { // … FloatVector<S256Bit> lr = l.add(r); lr.intoArray(res, length); }
www.hazelcast.com@noctarius2k Razersharp tooling
www.hazelcast.com@noctarius2k So what do we expect?
www.hazelcast.com@noctarius2k Peace with the Dragons
www.hazelcast.com@noctarius2k Peace with the Dragons C / C++
www.hazelcast.com@noctarius2k Painless communication…
www.hazelcast.com@noctarius2k Painless communication… …between native and Java code
www.hazelcast.com@noctarius2k More fun…
www.hazelcast.com@noctarius2k More fun… … and faster code …
www.hazelcast.com@noctarius2k More fun… …without JNI … and faster code …
www.hazelcast.com@noctarius2k Thank You & George R.R. Martin
www.hazelcast.com@noctarius2k More information: • http://openjdk.java.net/projects/valhalla/ • http://openjdk.java.net/projects/panama/ • http://cr.openjdk.java.net/~jrose/values/values-0.html • http://blog.codefx.org/java/dev/the-road-to-valhalla/ • http://openjdk.java.net/jeps/191 • https://www.youtube.com/watch?v=JR1zI5gLhRM • https://github.com/J9Java/panama-layout-prototype • https://developer.ibm.com/open/openprojects/project-panama-layout-prototype/ • https://www.youtube.com/watch?v=Tc9vs_HFHVo • https://www.youtube.com/watch?v=Z2XgO1H6xPM Thank You!
www.hazelcast.com@noctarius2k Thank You! Any Questions? @noctarius2k http://www.sourceprojects.org http://github.com/noctarius @hazelcast http://www.hazelcast.com http://www.hazelcast.org http://github.com/hazelcast
www.hazelcast.com@noctarius2k German speaking? JVM related talk on Slack Get your own invite at: https://slackin-jvm-german.herokuapp.com

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