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Project Panama - Beyond the (JVM) Wall

The document discusses the integration of Java with native code using Java Native Interface (JNI) and highlights tools and methodologies for managing processes and memory in Java. It covers practical examples of interfacing C code with Java, including obtaining the process ID and memory allocation. The content also mentions improvements in Java 9 and introduces methods for handling native code with MethodHandles and layout types.

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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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