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annotate jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotVMConfigVerifier.java @ 23392:b3a816d3b844

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Backed out changeset: a920338dd4d4
author Doug Simon <doug.simon@oracle.com>
date Thu, 12 May 2016 11:06:49 +0200
parents a920338dd4d4
children
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1 /*
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2 * Copyright (c) 2014, 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 package jdk.vm.ci.hotspot;
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24
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25 import static java.lang.String.format;
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26
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27 import java.io.IOException;
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28 import java.io.InputStream;
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29 import java.lang.reflect.Constructor;
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30 import java.lang.reflect.Executable;
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31 import java.lang.reflect.Method;
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32 import java.lang.reflect.Modifier;
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33 import java.security.AccessControlException;
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34 import java.util.Arrays;
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35 import java.util.Objects;
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36
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37 import jdk.vm.ci.common.JVMCIError;
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38 import jdk.internal.org.objectweb.asm.ClassReader;
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39 import jdk.internal.org.objectweb.asm.ClassVisitor;
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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 import jdk.internal.org.objectweb.asm.Type;
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44 import sun.misc.Unsafe;
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45
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46 /**
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47 * A verifier that checks that {@link HotSpotVMConfig} does not access {@link Unsafe} from any of
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48 * its non-static, non-constructor methods. This ensures that a deserialized {@link HotSpotVMConfig}
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49 * object does not perform any unsafe reads on addresses that are only valid in the context in which
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50 * the object was serialized. Note that this does not catch cases where a client uses an address
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51 * stored in a {@link HotSpotVMConfig} field.
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52 */
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53 final class HotSpotVMConfigVerifier {
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54
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55 public static boolean check() {
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56 Class<?> cls = HotSpotVMConfig.class;
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57 String classFilePath = "/" + cls.getName().replace('.', '/') + ".class";
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58 try {
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59 InputStream classfile = cls.getResourceAsStream(classFilePath);
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60 ClassReader cr = new ClassReader(Objects.requireNonNull(classfile, "Could not find class file for " + cls.getName()));
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61 ClassVisitor cv = new Verifier();
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62 cr.accept(cv, 0);
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63 return true;
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64 } catch (AccessControlException e) {
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65 /*
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66 * When running with a security manager and +UseJVMCIClassLoader the ASM classes might
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67 * not be accessible.
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68 */
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69 return true;
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70 } catch (IOException e) {
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71 throw new JVMCIError(e);
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72 }
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73 }
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74
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75 private static Class<?> resolve(String name) {
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76 try {
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77 return Class.forName(name.replace('/', '.'));
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78 } catch (ClassNotFoundException e) {
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79 throw new JVMCIError(e);
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80 }
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81 }
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82
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83 private static class Verifier extends ClassVisitor {
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84
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85 /**
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86 * Source file context for error reporting.
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87 */
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88 String sourceFile = null;
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89
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90 /**
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91 * Line number for error reporting.
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92 */
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93 int lineNo = -1;
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94
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95 Verifier() {
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96 super(Opcodes.ASM5);
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97 }
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98
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99 @Override
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100 public void visitSource(String source, String debug) {
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101 this.sourceFile = source;
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102 }
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103
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104 void verify(boolean condition, String message) {
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105 if (!condition) {
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106 error(message);
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107 }
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108 }
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109
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110 void error(String message) {
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111 String errorMessage = format("%s:%d: %s is not allowed in the context of compilation replay. The unsafe access should be moved into the %s constructor and the result cached in a field",
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112 sourceFile, lineNo, message, HotSpotVMConfig.class.getSimpleName());
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113 throw new JVMCIError(errorMessage);
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114
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115 }
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116
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117 @Override
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118 public MethodVisitor visitMethod(int access, String name, String d, String signature, String[] exceptions) {
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119 if (!Modifier.isStatic(access) && Modifier.isPublic(access) && !name.equals("<init>")) {
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120 return new MethodVisitor(Opcodes.ASM5) {
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121
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122 @Override
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123 public void visitLineNumber(int line, Label start) {
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124 lineNo = line;
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125 }
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126
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127 private Executable resolveMethod(String owner, String methodName, String methodDesc) {
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128 Class<?> declaringClass = resolve(owner);
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129 while (declaringClass != null) {
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130 if (methodName.equals("<init>")) {
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131 for (Constructor<?> c : declaringClass.getDeclaredConstructors()) {
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132 if (methodDesc.equals(Type.getConstructorDescriptor(c))) {
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133 return c;
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134 }
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135 }
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136 } else {
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137 Type[] argumentTypes = Type.getArgumentTypes(methodDesc);
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138 for (Method m : declaringClass.getDeclaredMethods()) {
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139 if (m.getName().equals(methodName)) {
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140 if (Arrays.equals(argumentTypes, Type.getArgumentTypes(m))) {
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141 if (Type.getReturnType(methodDesc).equals(Type.getReturnType(m))) {
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142 return m;
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143 }
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144 }
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145 }
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146 }
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147 }
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148 declaringClass = declaringClass.getSuperclass();
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149 }
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150 throw new NoSuchMethodError(owner + "." + methodName + methodDesc);
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151 }
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152
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153 /**
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154 * Checks whether a given method is allowed to be called.
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155 */
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156 private boolean checkInvokeTarget(Executable method) {
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157 if (method.getDeclaringClass().equals(Unsafe.class)) {
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158 return false;
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159 }
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160 return true;
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161 }
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162
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163 @Override
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164 public void visitMethodInsn(int opcode, String owner, String methodName, String methodDesc, boolean itf) {
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165 Executable callee = resolveMethod(owner, methodName, methodDesc);
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166 verify(checkInvokeTarget(callee), "invocation of " + callee);
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167 }
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168 };
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169 } else {
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170 return null;
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171 }
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172 }
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173 }
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174 }