nashorn/samples/Main.asm
author duke
Wed, 05 Jul 2017 21:31:37 +0200
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Merge
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/*
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 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 *   - Redistributions of source code must retain the above copyright
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 *     notice, this list of conditions and the following disclaimer.
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 *
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 *   - Redistributions in binary form must reproduce the above copyright
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 *     notice, this list of conditions and the following disclaimer in the
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 *     documentation and/or other materials provided with the distribution.
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 *
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 *   - Neither the name of Oracle nor the names of its
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 *     contributors may be used to endorse or promote products derived
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 *     from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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// Simple sample to demonstrate openjdk asmtools assembler with
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// nashorn dynalink linker in a invokedynamic instruction.
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//
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// To assemble this file, use the following command:
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//
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//    java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm
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//
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// See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools
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//
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// NOTE: Uses dynalink API defined by JEP-276 (http://openjdk.java.net/jeps/276)
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super public class Main
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	version 52:0
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{
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private static final Field linker:"Ljdk/dynalink/DynamicLinker;";
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/*
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   static {
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        // create dynalink linker factory
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        final DynamicLinkerFactory factory = new DynamicLinkerFactory();
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        // create standard linker that can handle Java POJOs
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        linker = factory.createLinker();
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   }
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*/
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static Method "<clinit>":"()V"
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        stack 2 locals 1
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{
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    new     class jdk/dynalink/DynamicLinkerFactory;
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    dup;
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    invokespecial   Method jdk/dynalink/DynamicLinkerFactory."<init>":"()V";
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    astore_0;
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    aload_0;
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    invokevirtual   Method jdk/dynalink/DynamicLinkerFactory.createLinker:"()Ljdk/dynalink/DynamicLinker;";
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    putstatic       Field linker:"Ljdk/dynalink/DynamicLinker;";
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    return;
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}
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/*
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    // Bootstrap method used with invokedynamic methods
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    public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType type) {
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        // use dynalink linker to perform the actual linking
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        return linker.link(
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            new SimpleRelinkableCallSite(
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                new CallSiteDescriptor(
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                    MethodHandles.publicLookup(), 
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                    new NamedOperation(StandardOperation.GET_PROPERTY, name), type)
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            )
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        );
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    }
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 */
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public static Method bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;"
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        stack 10 locals 3
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{
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    getstatic       Field linker:"Ljdk/dynalink/DynamicLinker;";
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    new     class jdk/dynalink/support/SimpleRelinkableCallSite;
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    dup;
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    new     class jdk/dynalink/CallSiteDescriptor;
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    dup;
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    invokestatic    Method java/lang/invoke/MethodHandles.publicLookup:"()Ljava/lang/invoke/MethodHandles$Lookup;";
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    new     class jdk/dynalink/NamedOperation;
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    dup;
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    getstatic       Field jdk/dynalink/StandardOperation.GET_PROPERTY:"Ljdk/dynalink/StandardOperation;";
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    aload_1;
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    invokespecial   Method jdk/dynalink/NamedOperation."<init>":"(Ljdk/dynalink/Operation;Ljava/lang/Object;)V";
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    aload_2;
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    invokespecial   Method jdk/dynalink/CallSiteDescriptor."<init>":"(Ljava/lang/invoke/MethodHandles$Lookup;Ljdk/dynalink/Operation;Ljava/lang/invoke/MethodType;)V";
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    invokespecial   Method jdk/dynalink/support/SimpleRelinkableCallSite."<init>":"(Ljdk/dynalink/CallSiteDescriptor;)V";
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    invokevirtual   Method jdk/dynalink/DynamicLinker.link:"(Ljdk/dynalink/RelinkableCallSite;)Ljdk/dynalink/RelinkableCallSite;";
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    checkcast       class java/lang/invoke/CallSite;
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    areturn;
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}
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// default constructor that does nothing!
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public Method "<init>":"()V"
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	stack 1 locals 1
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{
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    aload_0;
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    invokespecial	Method java/lang/Object."<init>":"()V";
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    return;
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}
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public static Method main:"([Ljava/lang/String;)V"
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	stack 2 locals 2
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{
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    // List l = new ArrayList();
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    new	class java/util/ArrayList;
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    dup;
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    invokespecial	Method java/util/ArrayList."<init>":"()V";
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    astore_1;
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    aload_1;
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    // l.add("hello");
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    ldc	String "hello";
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    invokeinterface	InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z",  2;
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    pop;
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    // l.add("world");
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    aload_1;
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    ldc	String "world";
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    invokeinterface	InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z",  2;
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    pop;
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    // printLength(l);
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    aload_1;
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    invokestatic	Method printLength:"(Ljava/lang/Object;)V";
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    // printLength(args); // args is argument of main method
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    aload_0;
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    invokestatic	Method printLength:"(Ljava/lang/Object;)V";
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    return;
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}
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private static Method printLength:"(Ljava/lang/Object;)V"
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	stack 2 locals 1
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{
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    getstatic	Field java/lang/System.out:"Ljava/io/PrintStream;";
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    aload_0;
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    // Using bootstrap method in this class with the following invokedynamic
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    // which uses dynalink linker. Dynalink's bean linker handles Java beans.
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    // 'length' property on a bean - arrays, lists supported
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    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;";
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    // print 'length' value
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    invokevirtual	Method java/io/PrintStream.println:"(Ljava/lang/Object;)V";
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    return;
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}
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} // end Class Main