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1 /* |
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2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. |
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3 * |
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4 * Redistribution and use in source and binary forms, with or without |
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5 * modification, are permitted provided that the following conditions |
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6 * are met: |
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7 * |
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8 * - Redistributions of source code must retain the above copyright |
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9 * notice, this list of conditions and the following disclaimer. |
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10 * |
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11 * - Redistributions in binary form must reproduce the above copyright |
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12 * notice, this list of conditions and the following disclaimer in the |
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13 * documentation and/or other materials provided with the distribution. |
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14 * |
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15 * - Neither the name of Oracle nor the names of its |
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16 * contributors may be used to endorse or promote products derived |
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17 * from this software without specific prior written permission. |
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18 * |
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19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
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20 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
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21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
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22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
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23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
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25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
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26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
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28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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30 */ |
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31 |
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32 // Simple sample to demonstrate openjdk asmtools assembler with |
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33 // nashorn dynalink linker in a invokedynamic instruction. |
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34 // |
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35 // To assemble this file, use the following command: |
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36 // |
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37 // java -cp <asmtools.jar> org.openjdk.asmtools.Main jasm Main.asm |
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38 // |
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39 // See also: https://wiki.openjdk.java.net/display/CodeTools/asmtools |
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40 // |
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41 // NOTE: Uses dynalink API defined by JEP-276 (http://openjdk.java.net/jeps/276) |
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42 |
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43 super public class Main |
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44 version 52:0 |
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45 { |
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46 |
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47 private static final Field linker:"Ljdk/dynalink/DynamicLinker;"; |
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48 |
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49 /* |
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50 static { |
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51 // create dynalink linker factory |
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52 final DynamicLinkerFactory factory = new DynamicLinkerFactory(); |
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53 |
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54 // create standard linker that can handle Java POJOs |
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55 linker = factory.createLinker(); |
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56 } |
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57 */ |
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58 static Method "<clinit>":"()V" |
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59 stack 2 locals 1 |
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60 { |
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61 new class jdk/dynalink/DynamicLinkerFactory; |
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62 dup; |
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63 invokespecial Method jdk/dynalink/DynamicLinkerFactory."<init>":"()V"; |
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64 astore_0; |
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65 aload_0; |
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66 invokevirtual Method jdk/dynalink/DynamicLinkerFactory.createLinker:"()Ljdk/dynalink/DynamicLinker;"; |
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67 putstatic Field linker:"Ljdk/dynalink/DynamicLinker;"; |
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68 return; |
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69 } |
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70 |
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71 /* |
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72 // Bootstrap method used with invokedynamic methods |
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73 |
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74 public static CallSite bootstrap(MethodHandles.Lookup caller, String name, MethodType type) { |
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75 // use dynalink linker to perform the actual linking |
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76 return linker.link( |
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77 new SimpleRelinkableCallSite( |
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78 new CallSiteDescriptor( |
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79 MethodHandles.publicLookup(), |
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80 new NamedOperation(StandardOperation.GET_PROPERTY, name), type) |
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81 ) |
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82 ); |
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83 } |
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84 |
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85 */ |
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86 public static Method bootstrap:"(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;" |
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87 stack 10 locals 3 |
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88 { |
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89 getstatic Field linker:"Ljdk/dynalink/DynamicLinker;"; |
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90 new class jdk/dynalink/support/SimpleRelinkableCallSite; |
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91 dup; |
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92 new class jdk/dynalink/CallSiteDescriptor; |
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93 dup; |
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94 invokestatic Method java/lang/invoke/MethodHandles.publicLookup:"()Ljava/lang/invoke/MethodHandles$Lookup;"; |
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95 new class jdk/dynalink/NamedOperation; |
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96 dup; |
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97 getstatic Field jdk/dynalink/StandardOperation.GET_PROPERTY:"Ljdk/dynalink/StandardOperation;"; |
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98 aload_1; |
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99 invokespecial Method jdk/dynalink/NamedOperation."<init>":"(Ljdk/dynalink/Operation;Ljava/lang/Object;)V"; |
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100 aload_2; |
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101 invokespecial Method jdk/dynalink/CallSiteDescriptor."<init>":"(Ljava/lang/invoke/MethodHandles$Lookup;Ljdk/dynalink/Operation;Ljava/lang/invoke/MethodType;)V"; |
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102 invokespecial Method jdk/dynalink/support/SimpleRelinkableCallSite."<init>":"(Ljdk/dynalink/CallSiteDescriptor;)V"; |
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103 invokevirtual Method jdk/dynalink/DynamicLinker.link:"(Ljdk/dynalink/RelinkableCallSite;)Ljdk/dynalink/RelinkableCallSite;"; |
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104 checkcast class java/lang/invoke/CallSite; |
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105 areturn; |
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106 } |
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107 |
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108 // default constructor that does nothing! |
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109 public Method "<init>":"()V" |
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110 stack 1 locals 1 |
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111 { |
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112 aload_0; |
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113 invokespecial Method java/lang/Object."<init>":"()V"; |
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114 return; |
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115 } |
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116 |
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117 public static Method main:"([Ljava/lang/String;)V" |
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118 stack 2 locals 2 |
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119 { |
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120 // List l = new ArrayList(); |
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121 new class java/util/ArrayList; |
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122 dup; |
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123 invokespecial Method java/util/ArrayList."<init>":"()V"; |
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124 astore_1; |
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125 aload_1; |
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126 |
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127 // l.add("hello"); |
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128 ldc String "hello"; |
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129 invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2; |
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130 pop; |
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131 |
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132 // l.add("world"); |
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133 aload_1; |
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134 ldc String "world"; |
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135 invokeinterface InterfaceMethod java/util/List.add:"(Ljava/lang/Object;)Z", 2; |
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136 pop; |
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137 |
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138 // printLength(l); |
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139 aload_1; |
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140 invokestatic Method printLength:"(Ljava/lang/Object;)V"; |
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141 |
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142 // printLength(args); // args is argument of main method |
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143 aload_0; |
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144 invokestatic Method printLength:"(Ljava/lang/Object;)V"; |
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145 return; |
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146 } |
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147 |
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148 private static Method printLength:"(Ljava/lang/Object;)V" |
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149 stack 2 locals 1 |
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150 { |
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151 getstatic Field java/lang/System.out:"Ljava/io/PrintStream;"; |
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152 aload_0; |
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153 |
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154 // Using bootstrap method in this class with the following invokedynamic |
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155 // which uses dynalink linker. Dynalink's bean linker handles Java beans. |
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156 // 'length' property on a bean - arrays, lists supported |
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157 |
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158 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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159 |
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160 // print 'length' value |
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161 invokevirtual Method java/io/PrintStream.println:"(Ljava/lang/Object;)V"; |
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162 return; |
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163 } |
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164 |
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165 } // end Class Main |