--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/sample/nashorn/Main.asm Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of Oracle nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+// Simple sample to demonstrate openjdk asmtools assembler with
+// nashorn dynalink linker in a invokedynamic instruction.
+//
+// To assemble this file, use the following command:
+//
+// java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm
+//
+// See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools
+//
+// NOTE: Uses dynalink API defined by JEP-276 (http://openjdk.java.net/jeps/276)
+
+super public class Main
+ version 52:0
+{
+
+private static final Field linker:"Ljdk/dynalink/DynamicLinker;";
+
+/*
+ static {
+ // create dynalink linker factory
+ final DynamicLinkerFactory factory = new DynamicLinkerFactory();
+
+ // create standard linker that can handle Java POJOs
+ linker = factory.createLinker();
+ }
+*/
+static Method "<clinit>":"()V"
+ stack 2 locals 1
+{
+ new class jdk/dynalink/DynamicLinkerFactory;
+ dup;
+ invokespecial Method jdk/dynalink/DynamicLinkerFactory."<init>":"()V";
+ astore_0;
+ aload_0;
+ invokevirtual Method jdk/dynalink/DynamicLinkerFactory.createLinker:"()Ljdk/dynalink/DynamicLinker;";
+ putstatic Field linker:"Ljdk/dynalink/DynamicLinker;";
+ return;
+}
+
+/*
+ // Bootstrap method used with invokedynamic methods
+
+ public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType type) {
+ // use dynalink linker to perform the actual linking
+ return linker.link(
+ new SimpleRelinkableCallSite(
+ new CallSiteDescriptor(
+ MethodHandles.publicLookup(),
+ new NamedOperation(StandardOperation.GET_PROPERTY, name), type)
+ )
+ );
+ }
+
+ */
+public static Method bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;"
+ stack 10 locals 3
+{
+ getstatic Field linker:"Ljdk/dynalink/DynamicLinker;";
+ new class jdk/dynalink/support/SimpleRelinkableCallSite;
+ dup;
+ new class jdk/dynalink/CallSiteDescriptor;
+ dup;
+ invokestatic Method java/lang/invoke/MethodHandles.publicLookup:"()Ljava/lang/invoke/MethodHandles$Lookup;";
+ new class jdk/dynalink/NamedOperation;
+ dup;
+ getstatic Field jdk/dynalink/StandardOperation.GET_PROPERTY:"Ljdk/dynalink/StandardOperation;";
+ aload_1;
+ invokespecial Method jdk/dynalink/NamedOperation."<init>":"(Ljdk/dynalink/Operation;Ljava/lang/Object;)V";
+ aload_2;
+ invokespecial Method jdk/dynalink/CallSiteDescriptor."<init>":"(Ljava/lang/invoke/MethodHandles$Lookup;Ljdk/dynalink/Operation;Ljava/lang/invoke/MethodType;)V";
+ invokespecial Method jdk/dynalink/support/SimpleRelinkableCallSite."<init>":"(Ljdk/dynalink/CallSiteDescriptor;)V";
+ invokevirtual Method jdk/dynalink/DynamicLinker.link:"(Ljdk/dynalink/RelinkableCallSite;)Ljdk/dynalink/RelinkableCallSite;";
+ checkcast class java/lang/invoke/CallSite;
+ areturn;
+}
+
+// default constructor that does nothing!
+public Method "<init>":"()V"
+ stack 1 locals 1
+{
+ aload_0;
+ invokespecial Method java/lang/Object."<init>":"()V";
+ return;
+}
+
+public static Method main:"([Ljava/lang/String;)V"
+ stack 2 locals 2
+{
+ // List l = new ArrayList();
+ new class java/util/ArrayList;
+ dup;
+ invokespecial Method java/util/ArrayList."<init>":"()V";
+ astore_1;
+ aload_1;
+
+ // l.add("hello");
+ ldc String "hello";
+ invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2;
+ pop;
+
+ // l.add("world");
+ aload_1;
+ ldc String "world";
+ invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2;
+ pop;
+
+ // printLength(l);
+ aload_1;
+ invokestatic Method printLength:"(Ljava/lang/Object;)V";
+
+ // printLength(args); // args is argument of main method
+ aload_0;
+ invokestatic Method printLength:"(Ljava/lang/Object;)V";
+ return;
+}
+
+private static Method printLength:"(Ljava/lang/Object;)V"
+ stack 2 locals 1
+{
+ getstatic Field java/lang/System.out:"Ljava/io/PrintStream;";
+ aload_0;
+
+ // Using bootstrap method in this class with the following invokedynamic
+ // which uses dynalink linker. Dynalink's bean linker handles Java beans.
+ // 'length' property on a bean - arrays, lists supported
+
+ invokedynamic InvokeDynamic REF_invokeStatic:Main.bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;":"length":"(Ljava/lang/Object;)Ljava/lang/Object;";
+
+ // print 'length' value
+ invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/Object;)V";
+ return;
+}
+
+} // end Class Main