Wed, 07 Oct 2015 10:01:40 -0700
Merge
1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of Oracle nor the names of its
16 * contributors may be used to endorse or promote products derived
17 * from this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
32 // Simple sample to demonstrate openjdk asmtools assembler with
33 // nashorn dynalink linker in a invokedynamic instruction.
34 //
35 // To assemble this file, use the following command:
36 //
37 // java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm
38 //
39 // See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools
40 //
41 // NOTE: Uses nashorn internals and so *may* break with later nashorn!
43 super public class Main
44 version 52:0
45 {
48 public Method "<init>":"()V"
49 stack 1 locals 1
50 {
51 aload_0;
52 invokespecial Method java/lang/Object."<init>":"()V";
53 return;
54 }
56 public static Method main:"([Ljava/lang/String;)V"
57 stack 2 locals 2
58 {
59 // List l = new ArrayList();
60 new class java/util/ArrayList;
61 dup;
62 invokespecial Method java/util/ArrayList."<init>":"()V";
63 astore_1;
64 aload_1;
66 // l.add("hello");
67 ldc String "hello";
68 invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2;
69 pop;
71 // l.add("world");
72 aload_1;
73 ldc String "world";
74 invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2;
75 pop;
77 // printLength(l);
78 aload_1;
79 invokestatic Method printLength:"(Ljava/lang/Object;)V";
81 // printLength(args); // args is argument of main method
82 aload_0;
83 invokestatic Method printLength:"(Ljava/lang/Object;)V";
84 return;
85 }
87 private static Method printLength:"(Ljava/lang/Object;)V"
88 stack 2 locals 1
89 {
90 getstatic Field java/lang/System.out:"Ljava/io/PrintStream;";
91 aload_0;
93 // Using nashorn embedded dynalink linker with the following invokedynamic
94 // 'length' property on a bean - arrays, lists supported
96 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;
98 // print 'length' value
99 invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/Object;)V";
100 return;
101 }
103 } // end Class Main