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| 1 | +/* | |
| 2 | + * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tracing.dtrace; | |
| 27 | + | |
| 28 | +import java.lang.reflect.Method; | |
| 29 | +import java.lang.reflect.InvocationTargetException; | |
| 30 | +import java.lang.reflect.Modifier; | |
| 31 | +import java.lang.reflect.Constructor; | |
| 32 | +import java.lang.reflect.InvocationHandler; | |
| 33 | +import java.lang.reflect.InvocationTargetException; | |
| 34 | +import java.lang.annotation.Annotation; | |
| 35 | +import java.util.HashMap; | |
| 36 | + | |
| 37 | +import sun.tracing.ProviderSkeleton; | |
| 38 | +import sun.tracing.ProbeSkeleton; | |
| 39 | +import com.sun.tracing.Provider; | |
| 40 | +import com.sun.tracing.ProviderName; | |
| 41 | +import com.sun.tracing.ProbeName; | |
| 42 | +import com.sun.tracing.dtrace.Attributes; | |
| 43 | +import com.sun.tracing.dtrace.ModuleName; | |
| 44 | +import com.sun.tracing.dtrace.FunctionName; | |
| 45 | +import com.sun.tracing.dtrace.StabilityLevel; | |
| 46 | +import com.sun.tracing.dtrace.DependencyClass; | |
| 47 | + | |
| 48 | +import sun.misc.ProxyGenerator; | |
| 49 | + | |
| 50 | +class DTraceProvider extends ProviderSkeleton { | |
| 51 | + | |
| 52 | + private Activation activation; | |
| 53 | + private Object proxy; | |
| 54 | + | |
| 55 | + // For proxy generation | |
| 56 | + private final static Class[] constructorParams = { InvocationHandler.class }; | |
| 57 | + private final String proxyClassNamePrefix = "$DTraceTracingProxy"; | |
| 58 | + | |
| 59 | + static final String DEFAULT_MODULE = "java_tracing"; | |
| 60 | + static final String DEFAULT_FUNCTION = "unspecified"; | |
| 61 | + | |
| 62 | + private static long nextUniqueNumber = 0; | |
| 63 | + private static synchronized long getUniqueNumber() { | |
| 64 | + return nextUniqueNumber++; | |
| 65 | + } | |
| 66 | + | |
| 67 | + protected ProbeSkeleton createProbe(Method m) { | |
| 68 | + return new DTraceProbe(proxy, m); | |
| 69 | + } | |
| 70 | + | |
| 71 | + DTraceProvider(Class<? extends Provider> type) { | |
| 72 | + super(type); | |
| 73 | + } | |
| 74 | + | |
| 75 | + void setProxy(Object p) { | |
| 76 | + proxy = p; | |
| 77 | + } | |
| 78 | + | |
| 79 | + void setActivation(Activation a) { | |
| 80 | + this.activation = a; | |
| 81 | + } | |
| 82 | + | |
| 83 | + public void dispose() { | |
| 84 | + if (activation != null) { | |
| 85 | + activation.disposeProvider(this); | |
| 86 | + activation = null; | |
| 87 | + } | |
| 88 | + super.dispose(); | |
| 89 | + } | |
| 90 | + | |
| 91 | + /** | |
| 92 | + * Magic routine which creates an implementation of the user's interface. | |
| 93 | + * | |
| 94 | + * This method uses the ProxyGenerator directly to bypass the | |
| 95 | + * java.lang.reflect.proxy cache so that we get a unique class each | |
| 96 | + * time it's called and can't accidently reuse a $Proxy class. | |
| 97 | + * | |
| 98 | + * @return an implementation of the user's interface | |
| 99 | + */ | |
| 100 | + @SuppressWarnings("unchecked") | |
| 101 | + public <T extends Provider> T newProxyInstance() { | |
| 102 | + /* | |
| 103 | + * Choose a name for the proxy class to generate. | |
| 104 | + */ | |
| 105 | + long num = getUniqueNumber(); | |
| 106 | + | |
| 107 | + String proxyPkg = ""; | |
| 108 | + if (!Modifier.isPublic(providerType.getModifiers())) { | |
| 109 | + String name = providerType.getName(); | |
| 110 | + int n = name.lastIndexOf('.'); | |
| 111 | + proxyPkg = ((n == -1) ? "" : name.substring(0, n + 1)); | |
| 112 | + } | |
| 113 | + | |
| 114 | + String proxyName = proxyPkg + proxyClassNamePrefix + num; | |
| 115 | + | |
| 116 | + /* | |
| 117 | + * Generate the specified proxy class. | |
| 118 | + */ | |
| 119 | + Class<?> proxyClass = null; | |
| 120 | + byte[] proxyClassFile = ProxyGenerator.generateProxyClass( | |
| 121 | + proxyName, new Class<?>[] { providerType }); | |
| 122 | + try { | |
| 123 | + proxyClass = JVM.defineClass( | |
| 124 | + providerType.getClassLoader(), proxyName, | |
| 125 | + proxyClassFile, 0, proxyClassFile.length); | |
| 126 | + } catch (ClassFormatError e) { | |
| 127 | + /* | |
| 128 | + * A ClassFormatError here means that (barring bugs in the | |
| 129 | + * proxy class generation code) there was some other | |
| 130 | + * invalid aspect of the arguments supplied to the proxy | |
| 131 | + * class creation (such as virtual machine limitations | |
| 132 | + * exceeded). | |
| 133 | + */ | |
| 134 | + throw new IllegalArgumentException(e.toString()); | |
| 135 | + } | |
| 136 | + | |
| 137 | + /* | |
| 138 | + * Invoke its constructor with the designated invocation handler. | |
| 139 | + */ | |
| 140 | + try { | |
| 141 | + Constructor cons = proxyClass.getConstructor(constructorParams); | |
| 142 | + return (T)cons.newInstance(new Object[] { this }); | |
| 143 | + } catch (NoSuchMethodException e) { | |
| 144 | + throw new InternalError(e.toString()); | |
| 145 | + } catch (IllegalAccessException e) { | |
| 146 | + throw new InternalError(e.toString()); | |
| 147 | + } catch (InstantiationException e) { | |
| 148 | + throw new InternalError(e.toString()); | |
| 149 | + } catch (InvocationTargetException e) { | |
| 150 | + throw new InternalError(e.toString()); | |
| 151 | + } | |
| 152 | + } | |
| 153 | + | |
| 154 | + // In the normal case, the proxy object's method implementations will call | |
| 155 | + // this method (it usually calls the ProviderSkeleton's version). That | |
| 156 | + // method uses the passed 'method' object to lookup the associated | |
| 157 | + // 'ProbeSkeleton' and calls uncheckedTrigger() on that probe to cause the | |
| 158 | + // probe to fire. DTrace probes are different in that the proxy class's | |
| 159 | + // methods are immediately overridden with native code to fire the probe | |
| 160 | + // directly. So this method should never get invoked. We also wire up the | |
| 161 | + // DTraceProbe.uncheckedTrigger() method to call the proxy method instead | |
| 162 | + // of doing the work itself. | |
| 163 | + public Object invoke(Object proxy, Method method, Object[] args) { | |
| 164 | + if (method.getDeclaringClass() != providerType) { | |
| 165 | + try { | |
| 166 | + return method.invoke(this, args); | |
| 167 | + } catch (IllegalAccessException e) { | |
| 168 | + assert false; | |
| 169 | + } catch (InvocationTargetException e) { | |
| 170 | + assert false; | |
| 171 | + } | |
| 172 | + } else if (active) { | |
| 173 | + assert false : "This method should have been overridden by the JVM"; | |
| 174 | + } | |
| 175 | + return null; | |
| 176 | + } | |
| 177 | + | |
| 178 | + public String getProviderName() { | |
| 179 | + return super.getProviderName(); | |
| 180 | + } | |
| 181 | + | |
| 182 | + String getModuleName() { | |
| 183 | + return getAnnotationString( | |
| 184 | + providerType, ModuleName.class, DEFAULT_MODULE); | |
| 185 | + } | |
| 186 | + | |
| 187 | + static String getProbeName(Method method) { | |
| 188 | + return getAnnotationString( | |
| 189 | + method, ProbeName.class, method.getName()); | |
| 190 | + } | |
| 191 | + | |
| 192 | + static String getFunctionName(Method method) { | |
| 193 | + return getAnnotationString( | |
| 194 | + method, FunctionName.class, DEFAULT_FUNCTION); | |
| 195 | + } | |
| 196 | + | |
| 197 | + DTraceProbe[] getProbes() { | |
| 198 | + return probes.values().toArray(new DTraceProbe[0]); | |
| 199 | + } | |
| 200 | + | |
| 201 | + StabilityLevel getNameStabilityFor(Class<? extends Annotation> type) { | |
| 202 | + Attributes attrs = (Attributes)getAnnotationValue( | |
| 203 | + providerType, type, "value", null); | |
| 204 | + if (attrs == null) { | |
| 205 | + return StabilityLevel.PRIVATE; | |
| 206 | + } else { | |
| 207 | + return attrs.name(); | |
| 208 | + } | |
| 209 | + } | |
| 210 | + | |
| 211 | + StabilityLevel getDataStabilityFor(Class<? extends Annotation> type) { | |
| 212 | + Attributes attrs = (Attributes)getAnnotationValue( | |
| 213 | + providerType, type, "value", null); | |
| 214 | + if (attrs == null) { | |
| 215 | + return StabilityLevel.PRIVATE; | |
| 216 | + } else { | |
| 217 | + return attrs.data(); | |
| 218 | + } | |
| 219 | + } | |
| 220 | + | |
| 221 | + DependencyClass getDependencyClassFor(Class<? extends Annotation> type) { | |
| 222 | + Attributes attrs = (Attributes)getAnnotationValue( | |
| 223 | + providerType, type, "value", null); | |
| 224 | + if (attrs == null) { | |
| 225 | + return DependencyClass.UNKNOWN; | |
| 226 | + } else { | |
| 227 | + return attrs.dependency(); | |
| 228 | + } | |
| 229 | + } | |
| 230 | +} | |