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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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
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22 */ |
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23 |
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24 package compiler.calls.common; |
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25 |
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26 import java.io.FileInputStream; |
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27 import java.io.IOException; |
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28 import java.lang.invoke.CallSite; |
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29 import java.lang.invoke.MethodHandles; |
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30 import java.lang.invoke.MethodType; |
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31 import java.net.URISyntaxException; |
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32 import java.nio.file.Files; |
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33 import java.nio.file.Path; |
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34 import java.nio.file.Paths; |
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35 import java.nio.file.StandardOpenOption; |
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36 import jdk.internal.org.objectweb.asm.ClassReader; |
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37 import jdk.internal.org.objectweb.asm.ClassVisitor; |
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38 import jdk.internal.org.objectweb.asm.ClassWriter; |
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39 import jdk.internal.org.objectweb.asm.Handle; |
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40 import jdk.internal.org.objectweb.asm.Label; |
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41 import jdk.internal.org.objectweb.asm.MethodVisitor; |
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42 import jdk.internal.org.objectweb.asm.Opcodes; |
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43 |
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44 /** |
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45 * A class which patch InvokeDynamic class bytecode with invokydynamic |
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46 instruction, rewriting "caller" method to call "callee" method using |
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47 invokedynamic |
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48 */ |
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49 public class InvokeDynamicPatcher extends ClassVisitor { |
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50 |
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51 private static final String CLASS = InvokeDynamic.class.getName() |
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52 .replace('.', '/'); |
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53 private static final String CALLER_METHOD_NAME = "caller"; |
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54 private static final String CALLEE_METHOD_NAME = "callee"; |
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55 private static final String NATIVE_CALLEE_METHOD_NAME = "calleeNative"; |
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56 private static final String BOOTSTRAP_METHOD_NAME = "bootstrapMethod"; |
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57 private static final String CALL_NATIVE_FIELD = "nativeCallee"; |
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58 private static final String CALL_NATIVE_FIELD_DESC = "Z"; |
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59 private static final String CALLEE_METHOD_DESC |
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60 = "(L" + CLASS + ";IJFDLjava/lang/String;)Z"; |
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61 private static final String ASSERTTRUE_METHOD_DESC |
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62 = "(ZLjava/lang/String;)V"; |
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63 private static final String ASSERTS_CLASS = "jdk/test/lib/Asserts"; |
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64 private static final String ASSERTTRUE_METHOD_NAME = "assertTrue"; |
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65 |
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66 public static void main(String args[]) { |
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67 ClassReader cr; |
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68 Path filePath; |
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69 try { |
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70 filePath = Paths.get(InvokeDynamic.class.getProtectionDomain().getCodeSource() |
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71 .getLocation().toURI()).resolve(CLASS + ".class"); |
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72 } catch (URISyntaxException ex) { |
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73 throw new Error("TESTBUG: Can't get code source" + ex, ex); |
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74 } |
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75 try (FileInputStream fis = new FileInputStream(filePath.toFile())) { |
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76 cr = new ClassReader(fis); |
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77 } catch (IOException e) { |
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78 throw new Error("Error reading file", e); |
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79 } |
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80 ClassWriter cw = new ClassWriter(cr, |
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81 ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); |
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82 cr.accept(new InvokeDynamicPatcher(Opcodes.ASM5, cw), 0); |
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83 try { |
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84 Files.write(filePath, cw.toByteArray(), |
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85 StandardOpenOption.WRITE); |
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86 } catch (IOException e) { |
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87 throw new Error(e); |
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88 } |
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89 } |
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90 |
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91 public InvokeDynamicPatcher(int api, ClassWriter cw) { |
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92 super(api, cw); |
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93 } |
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94 |
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95 @Override |
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96 public MethodVisitor visitMethod(final int access, final String name, |
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97 final String desc, final String signature, |
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98 final String[] exceptions) { |
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99 /* a code generate looks like |
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100 * 0: aload_0 |
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101 * 1: ldc #125 // int 1 |
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102 * 3: ldc2_w #126 // long 2l |
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103 * 6: ldc #128 // float 3.0f |
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104 * 8: ldc2_w #129 // double 4.0d |
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105 * 11: ldc #132 // String 5 |
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106 * 13: aload_0 |
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107 * 14: getfield #135 // Field nativeCallee:Z |
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108 * 17: ifeq 28 |
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109 * 20: invokedynamic #181, 0 // InvokeDynamic #1:calleeNative:(Lcompiler/calls/common/InvokeDynamic;IJFDLjava/lang/String;)Z |
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110 * 25: goto 33 |
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111 * 28: invokedynamic #183, 0 // InvokeDynamic #1:callee:(Lcompiler/calls/common/InvokeDynamic;IJFDLjava/lang/String;)Z |
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112 * 33: ldc #185 // String Call insuccessfull |
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113 * 35: invokestatic #191 // Method jdk/test/lib/Asserts.assertTrue:(ZLjava/lang/String;)V |
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114 * 38: return |
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115 * |
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116 * or, using java-like pseudo-code |
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117 * if (this.nativeCallee == false) { |
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118 * invokedynamic-call-return-value = invokedynamic-of-callee |
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119 * } else { |
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120 * invokedynamic-call-return-value = invokedynamic-of-nativeCallee |
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121 * } |
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122 * Asserts.assertTrue(invokedynamic-call-return-value, error-message); |
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123 * return; |
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124 */ |
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125 if (name.equals(CALLER_METHOD_NAME)) { |
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126 MethodVisitor mv = cv.visitMethod(access, name, desc, |
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127 signature, exceptions); |
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128 Label nonNativeLabel = new Label(); |
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129 Label checkLabel = new Label(); |
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130 MethodType mtype = MethodType.methodType(CallSite.class, |
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131 MethodHandles.Lookup.class, String.class, MethodType.class); |
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132 Handle bootstrap = new Handle(Opcodes.H_INVOKESTATIC, CLASS, |
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133 BOOTSTRAP_METHOD_NAME, mtype.toMethodDescriptorString()); |
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134 mv.visitCode(); |
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135 // push callee parameters onto stack |
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136 mv.visitVarInsn(Opcodes.ALOAD, 0);//push "this" |
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137 mv.visitLdcInsn(1); |
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138 mv.visitLdcInsn(2L); |
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139 mv.visitLdcInsn(3.0f); |
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140 mv.visitLdcInsn(4.0d); |
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141 mv.visitLdcInsn("5"); |
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142 // params loaded. let's decide what method to call |
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143 mv.visitVarInsn(Opcodes.ALOAD, 0); // push "this" |
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144 // get nativeCallee field |
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145 mv.visitFieldInsn(Opcodes.GETFIELD, CLASS, CALL_NATIVE_FIELD, |
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146 CALL_NATIVE_FIELD_DESC); |
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147 // if nativeCallee == false goto nonNativeLabel |
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148 mv.visitJumpInsn(Opcodes.IFEQ, nonNativeLabel); |
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149 // invokedynamic nativeCalleeMethod using bootstrap method |
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150 mv.visitInvokeDynamicInsn(NATIVE_CALLEE_METHOD_NAME, |
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151 CALLEE_METHOD_DESC, bootstrap); |
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152 // goto checkLabel |
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153 mv.visitJumpInsn(Opcodes.GOTO, checkLabel); |
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154 // label: nonNativeLabel |
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155 mv.visitLabel(nonNativeLabel); |
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156 // invokedynamic calleeMethod using bootstrap method |
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157 mv.visitInvokeDynamicInsn(CALLEE_METHOD_NAME, CALLEE_METHOD_DESC, |
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158 bootstrap); |
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159 mv.visitLabel(checkLabel); |
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160 mv.visitLdcInsn(CallsBase.CALL_ERR_MSG); |
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161 mv.visitMethodInsn(Opcodes.INVOKESTATIC, ASSERTS_CLASS, |
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162 ASSERTTRUE_METHOD_NAME, ASSERTTRUE_METHOD_DESC, false); |
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163 // label: return |
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164 mv.visitInsn(Opcodes.RETURN); |
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165 mv.visitMaxs(0, 0); |
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166 mv.visitEnd(); |
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167 return null; |
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168 } |
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169 return super.visitMethod(access, name, desc, signature, exceptions); |
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170 } |
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171 } |