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
