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1 /* |
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2 * Copyright (c) 2008, 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. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 package sun.tracing.dtrace; |
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27 |
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28 import java.lang.reflect.Method; |
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29 import java.lang.reflect.Modifier; |
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30 import java.lang.reflect.Constructor; |
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31 import java.lang.reflect.InvocationHandler; |
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32 import java.lang.reflect.InvocationTargetException; |
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33 import java.lang.annotation.Annotation; |
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34 |
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35 import sun.tracing.ProviderSkeleton; |
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36 import sun.tracing.ProbeSkeleton; |
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37 import com.sun.tracing.Provider; |
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38 import com.sun.tracing.ProbeName; |
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39 import com.sun.tracing.dtrace.Attributes; |
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40 import com.sun.tracing.dtrace.ModuleName; |
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41 import com.sun.tracing.dtrace.FunctionName; |
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42 import com.sun.tracing.dtrace.StabilityLevel; |
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43 import com.sun.tracing.dtrace.DependencyClass; |
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44 |
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45 import sun.misc.ProxyGenerator; |
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46 |
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47 class DTraceProvider extends ProviderSkeleton { |
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48 |
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49 private Activation activation; |
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50 private Object proxy; |
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51 |
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52 // For proxy generation |
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53 private final static Class<?>[] constructorParams = { InvocationHandler.class }; |
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54 private final String proxyClassNamePrefix = "$DTraceTracingProxy"; |
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55 |
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56 static final String DEFAULT_MODULE = "java_tracing"; |
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57 static final String DEFAULT_FUNCTION = "unspecified"; |
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58 |
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59 private static long nextUniqueNumber = 0; |
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60 private static synchronized long getUniqueNumber() { |
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61 return nextUniqueNumber++; |
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62 } |
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63 |
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64 protected ProbeSkeleton createProbe(Method m) { |
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65 return new DTraceProbe(proxy, m); |
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66 } |
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67 |
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68 DTraceProvider(Class<? extends Provider> type) { |
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69 super(type); |
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70 } |
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71 |
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72 void setProxy(Object p) { |
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73 proxy = p; |
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74 } |
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75 |
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76 void setActivation(Activation a) { |
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77 this.activation = a; |
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78 } |
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79 |
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80 public void dispose() { |
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81 if (activation != null) { |
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82 activation.disposeProvider(this); |
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83 activation = null; |
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84 } |
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85 super.dispose(); |
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86 } |
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87 |
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88 /** |
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89 * Magic routine which creates an implementation of the user's interface. |
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90 * |
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91 * This method uses the ProxyGenerator directly to bypass the |
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92 * java.lang.reflect.proxy cache so that we get a unique class each |
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93 * time it's called and can't accidently reuse a $Proxy class. |
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94 * |
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95 * @return an implementation of the user's interface |
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96 */ |
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97 @SuppressWarnings("unchecked") |
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98 public <T extends Provider> T newProxyInstance() { |
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99 /* |
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100 * Choose a name for the proxy class to generate. |
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101 */ |
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102 long num = getUniqueNumber(); |
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103 |
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104 String proxyPkg = ""; |
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105 if (!Modifier.isPublic(providerType.getModifiers())) { |
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106 String name = providerType.getName(); |
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107 int n = name.lastIndexOf('.'); |
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108 proxyPkg = ((n == -1) ? "" : name.substring(0, n + 1)); |
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109 } |
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110 |
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111 String proxyName = proxyPkg + proxyClassNamePrefix + num; |
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112 |
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113 /* |
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114 * Generate the specified proxy class. |
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115 */ |
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116 Class<?> proxyClass = null; |
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117 byte[] proxyClassFile = ProxyGenerator.generateProxyClass( |
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118 proxyName, new Class<?>[] { providerType }); |
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119 try { |
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120 proxyClass = JVM.defineClass( |
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121 providerType.getClassLoader(), proxyName, |
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122 proxyClassFile, 0, proxyClassFile.length); |
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123 } catch (ClassFormatError e) { |
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124 /* |
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125 * A ClassFormatError here means that (barring bugs in the |
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126 * proxy class generation code) there was some other |
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127 * invalid aspect of the arguments supplied to the proxy |
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128 * class creation (such as virtual machine limitations |
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129 * exceeded). |
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130 */ |
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131 throw new IllegalArgumentException(e.toString()); |
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132 } |
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133 |
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134 /* |
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135 * Invoke its constructor with the designated invocation handler. |
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136 */ |
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137 try { |
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138 Constructor<?> cons = proxyClass.getConstructor(constructorParams); |
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139 return (T)cons.newInstance(new Object[] { this }); |
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140 } catch (ReflectiveOperationException e) { |
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141 throw new InternalError(e.toString(), e); |
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142 } |
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143 } |
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144 |
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145 // In the normal case, the proxy object's method implementations will call |
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146 // this method (it usually calls the ProviderSkeleton's version). That |
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147 // method uses the passed 'method' object to lookup the associated |
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148 // 'ProbeSkeleton' and calls uncheckedTrigger() on that probe to cause the |
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149 // probe to fire. DTrace probes are different in that the proxy class's |
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150 // methods are immediately overridden with native code to fire the probe |
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151 // directly. So this method should never get invoked. We also wire up the |
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152 // DTraceProbe.uncheckedTrigger() method to call the proxy method instead |
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153 // of doing the work itself. |
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154 protected void triggerProbe(Method method, Object[] args) { |
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155 assert false : "This method should have been overridden by the JVM"; |
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156 } |
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157 |
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158 public String getProviderName() { |
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159 return super.getProviderName(); |
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160 } |
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161 |
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162 String getModuleName() { |
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163 return getAnnotationString( |
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164 providerType, ModuleName.class, DEFAULT_MODULE); |
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165 } |
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166 |
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167 static String getProbeName(Method method) { |
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168 return getAnnotationString( |
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169 method, ProbeName.class, method.getName()); |
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170 } |
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171 |
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172 static String getFunctionName(Method method) { |
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173 return getAnnotationString( |
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174 method, FunctionName.class, DEFAULT_FUNCTION); |
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175 } |
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176 |
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177 DTraceProbe[] getProbes() { |
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178 return probes.values().toArray(new DTraceProbe[0]); |
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179 } |
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180 |
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181 StabilityLevel getNameStabilityFor(Class<? extends Annotation> type) { |
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182 Attributes attrs = (Attributes)getAnnotationValue( |
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183 providerType, type, "value", null); |
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184 if (attrs == null) { |
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185 return StabilityLevel.PRIVATE; |
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186 } else { |
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187 return attrs.name(); |
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188 } |
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189 } |
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190 |
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191 StabilityLevel getDataStabilityFor(Class<? extends Annotation> type) { |
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192 Attributes attrs = (Attributes)getAnnotationValue( |
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193 providerType, type, "value", null); |
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194 if (attrs == null) { |
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195 return StabilityLevel.PRIVATE; |
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196 } else { |
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197 return attrs.data(); |
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198 } |
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199 } |
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200 |
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201 DependencyClass getDependencyClassFor(Class<? extends Annotation> type) { |
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202 Attributes attrs = (Attributes)getAnnotationValue( |
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203 providerType, type, "value", null); |
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204 if (attrs == null) { |
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205 return DependencyClass.UNKNOWN; |
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206 } else { |
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207 return attrs.dependency(); |
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208 } |
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209 } |
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210 } |