1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/samples/Main.asm Fri Sep 04 17:17:44 2015 +0530 1.3 @@ -0,0 +1,103 @@ 1.4 +/* 1.5 + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. 1.6 + * 1.7 + * Redistribution and use in source and binary forms, with or without 1.8 + * modification, are permitted provided that the following conditions 1.9 + * are met: 1.10 + * 1.11 + * - Redistributions of source code must retain the above copyright 1.12 + * notice, this list of conditions and the following disclaimer. 1.13 + * 1.14 + * - Redistributions in binary form must reproduce the above copyright 1.15 + * notice, this list of conditions and the following disclaimer in the 1.16 + * documentation and/or other materials provided with the distribution. 1.17 + * 1.18 + * - Neither the name of Oracle nor the names of its 1.19 + * contributors may be used to endorse or promote products derived 1.20 + * from this software without specific prior written permission. 1.21 + * 1.22 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS 1.23 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 1.24 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 1.25 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR 1.26 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 1.27 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 1.28 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 1.29 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 1.30 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 1.31 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 1.32 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 1.33 + */ 1.34 + 1.35 +// Simple sample to demonstrate openjdk asmtools assembler with 1.36 +// nashorn dynalink linker in a invokedynamic instruction. 1.37 +// 1.38 +// To assemble this file, use the following command: 1.39 +// 1.40 +// java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm 1.41 +// 1.42 +// See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools 1.43 +// 1.44 +// NOTE: Uses nashorn internals and so *may* break with later nashorn! 1.45 + 1.46 +super public class Main 1.47 + version 52:0 1.48 +{ 1.49 + 1.50 + 1.51 +public Method "<init>":"()V" 1.52 + stack 1 locals 1 1.53 +{ 1.54 + aload_0; 1.55 + invokespecial Method java/lang/Object."<init>":"()V"; 1.56 + return; 1.57 +} 1.58 + 1.59 +public static Method main:"([Ljava/lang/String;)V" 1.60 + stack 2 locals 2 1.61 +{ 1.62 + // List l = new ArrayList(); 1.63 + new class java/util/ArrayList; 1.64 + dup; 1.65 + invokespecial Method java/util/ArrayList."<init>":"()V"; 1.66 + astore_1; 1.67 + aload_1; 1.68 + 1.69 + // l.add("hello"); 1.70 + ldc String "hello"; 1.71 + invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2; 1.72 + pop; 1.73 + 1.74 + // l.add("world"); 1.75 + aload_1; 1.76 + ldc String "world"; 1.77 + invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2; 1.78 + pop; 1.79 + 1.80 + // printLength(l); 1.81 + aload_1; 1.82 + invokestatic Method printLength:"(Ljava/lang/Object;)V"; 1.83 + 1.84 + // printLength(args); // args is argument of main method 1.85 + aload_0; 1.86 + invokestatic Method printLength:"(Ljava/lang/Object;)V"; 1.87 + return; 1.88 +} 1.89 + 1.90 +private static Method printLength:"(Ljava/lang/Object;)V" 1.91 + stack 2 locals 1 1.92 +{ 1.93 + getstatic Field java/lang/System.out:"Ljava/io/PrintStream;"; 1.94 + aload_0; 1.95 + 1.96 + // Using nashorn embedded dynalink linker with the following invokedynamic 1.97 + // 'length' property on a bean - arrays, lists supported 1.98 + 1.99 + invokedynamic InvokeDynamic REF_invokeStatic:jdk/nashorn/internal/runtime/linker/Bootstrap.bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;I)Ljava/lang/invoke/CallSite;":"dyn:getProp|getElem|getMethod:length":"(Ljava/lang/Object;)Ljava/lang/Object;" int 0; 1.100 + 1.101 + // print 'length' value 1.102 + invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/Object;)V"; 1.103 + return; 1.104 +} 1.105 + 1.106 +} // end Class Main