1 /* 2 * Copyright (c) 2016, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 package org.graalvm.compiler.serviceprovider; 26 27 import static java.lang.Thread.currentThread; 28 29 import java.io.IOException; 30 import java.io.InputStream; 31 import java.lang.reflect.Method; 32 import java.util.Iterator; 33 import java.util.List; 34 import java.util.ServiceConfigurationError; 35 import java.util.ServiceLoader; 36 import java.util.concurrent.atomic.AtomicLong; 37 38 import jdk.vm.ci.meta.ConstantPool; 39 import jdk.vm.ci.meta.JavaType; 40 import jdk.vm.ci.services.JVMCIPermission; 41 import jdk.vm.ci.services.Services; 42 43 /** 44 * Interface to functionality that abstracts over which JDK version Graal is running on. 45 */ 46 public final class GraalServices { 47 getJavaSpecificationVersion()48 private static int getJavaSpecificationVersion() { 49 String value = System.getProperty("java.specification.version"); 50 if (value.startsWith("1.")) { 51 value = value.substring(2); 52 } 53 return Integer.parseInt(value); 54 } 55 56 /** 57 * The integer value corresponding to the value of the {@code java.specification.version} system 58 * property after any leading {@code "1."} has been stripped. 59 */ 60 public static final int JAVA_SPECIFICATION_VERSION = getJavaSpecificationVersion(); 61 62 /** 63 * Determines if the Java runtime is version 8 or earlier. 64 */ 65 public static final boolean Java8OrEarlier = JAVA_SPECIFICATION_VERSION <= 8; 66 GraalServices()67 private GraalServices() { 68 } 69 70 /** 71 * Gets an {@link Iterable} of the providers available for a given service. 72 * 73 * @throws SecurityException if on JDK8 and a security manager is present and it denies 74 * {@link JVMCIPermission} 75 */ load(Class<S> service)76 public static <S> Iterable<S> load(Class<S> service) { 77 assert !service.getName().startsWith("jdk.vm.ci") : "JVMCI services must be loaded via " + Services.class.getName(); 78 Iterable<S> iterable = ServiceLoader.load(service); 79 return new Iterable<>() { 80 @Override 81 public Iterator<S> iterator() { 82 Iterator<S> iterator = iterable.iterator(); 83 return new Iterator<>() { 84 @Override 85 public boolean hasNext() { 86 return iterator.hasNext(); 87 } 88 89 @Override 90 public S next() { 91 S provider = iterator.next(); 92 // Allow Graal extensions to access JVMCI 93 openJVMCITo(provider.getClass()); 94 return provider; 95 } 96 97 @Override 98 public void remove() { 99 iterator.remove(); 100 } 101 }; 102 } 103 }; 104 } 105 106 /** 107 * Opens all JVMCI packages to the module of a given class. This relies on JVMCI already having 108 * opened all its packages to the module defining {@link GraalServices}. 109 * 110 * @param other all JVMCI packages will be opened to the module defining this class 111 */ 112 static void openJVMCITo(Class<?> other) { 113 Module jvmciModule = JVMCI_MODULE; 114 Module otherModule = other.getModule(); 115 if (jvmciModule != otherModule) { 116 for (String pkg : jvmciModule.getPackages()) { 117 if (!jvmciModule.isOpen(pkg, otherModule)) { 118 jvmciModule.addOpens(pkg, otherModule); 119 } 120 } 121 } 122 } 123 124 /** 125 * Gets the provider for a given service for which at most one provider must be available. 126 * 127 * @param service the service whose provider is being requested 128 * @param required specifies if an {@link InternalError} should be thrown if no provider of 129 * {@code service} is available 130 * @return the requested provider if available else {@code null} 131 * @throws SecurityException if on JDK8 and a security manager is present and it denies 132 * {@link JVMCIPermission} 133 */ 134 public static <S> S loadSingle(Class<S> service, boolean required) { 135 assert !service.getName().startsWith("jdk.vm.ci") : "JVMCI services must be loaded via " + Services.class.getName(); 136 Iterable<S> providers = load(service); 137 S singleProvider = null; 138 try { 139 for (Iterator<S> it = providers.iterator(); it.hasNext();) { 140 singleProvider = it.next(); 141 if (it.hasNext()) { 142 S other = it.next(); 143 throw new InternalError(String.format("Multiple %s providers found: %s, %s", service.getName(), singleProvider.getClass().getName(), other.getClass().getName())); 144 } 145 } 146 } catch (ServiceConfigurationError e) { 147 // If the service is required we will bail out below. 148 } 149 if (singleProvider == null) { 150 if (required) { 151 throw new InternalError(String.format("No provider for %s found", service.getName())); 152 } 153 } 154 return singleProvider; 155 } 156 157 /** 158 * Gets the class file bytes for {@code c}. 159 */ 160 public static InputStream getClassfileAsStream(Class<?> c) throws IOException { 161 String classfilePath = c.getName().replace('.', '/') + ".class"; 162 return c.getModule().getResourceAsStream(classfilePath); 163 } 164 165 private static final Module JVMCI_MODULE = Services.class.getModule(); 166 167 /** 168 * A JVMCI package dynamically exported to trusted modules. 169 */ 170 private static final String JVMCI_RUNTIME_PACKAGE = "jdk.vm.ci.runtime"; 171 static { 172 assert JVMCI_MODULE.getPackages().contains(JVMCI_RUNTIME_PACKAGE); 173 } 174 175 /** 176 * Determines if invoking {@link Object#toString()} on an instance of {@code c} will only run 177 * trusted code. 178 */ 179 public static boolean isToStringTrusted(Class<?> c) { 180 Module module = c.getModule(); 181 Module jvmciModule = JVMCI_MODULE; 182 assert jvmciModule.getPackages().contains("jdk.vm.ci.runtime"); 183 if (module == jvmciModule || jvmciModule.isOpen(JVMCI_RUNTIME_PACKAGE, module)) { 184 // Can access non-statically-exported package in JVMCI 185 return true; 186 } 187 return false; 188 } 189 190 /** 191 * Gets a unique identifier for this execution such as a process ID or a 192 * {@linkplain #getGlobalTimeStamp() fixed timestamp}. 193 */ 194 public static String getExecutionID() { 195 return Long.toString(ProcessHandle.current().pid()); 196 } 197 198 private static final AtomicLong globalTimeStamp = new AtomicLong(); 199 200 /** 201 * Gets a time stamp for the current process. This method will always return the same value for 202 * the current VM execution. 203 */ 204 public static long getGlobalTimeStamp() { 205 if (globalTimeStamp.get() == 0) { 206 globalTimeStamp.compareAndSet(0, System.currentTimeMillis()); 207 } 208 return globalTimeStamp.get(); 209 } 210 211 /** 212 * Access to thread specific information made available via Java Management Extensions (JMX). 213 * Using this abstraction enables avoiding a dependency to the {@code java.management} and 214 * {@code jdk.management} modules on JDK 9 and later. 215 */ 216 public abstract static class JMXService { 217 protected abstract long getThreadAllocatedBytes(long id); 218 219 protected abstract long getCurrentThreadCpuTime(); 220 221 protected abstract boolean isThreadAllocatedMemorySupported(); 222 223 protected abstract boolean isCurrentThreadCpuTimeSupported(); 224 225 protected abstract List<String> getInputArguments(); 226 227 // Placing this static field in JMXService (instead of GraalServices) 228 // allows for lazy initialization. 229 static final JMXService instance = loadSingle(JMXService.class, false); 230 } 231 232 /** 233 * Returns an approximation of the total amount of memory, in bytes, allocated in heap memory 234 * for the thread of the specified ID. The returned value is an approximation because some Java 235 * virtual machine implementations may use object allocation mechanisms that result in a delay 236 * between the time an object is allocated and the time its size is recorded. 237 * <p> 238 * If the thread of the specified ID is not alive or does not exist, this method returns 239 * {@code -1}. If thread memory allocation measurement is disabled, this method returns 240 * {@code -1}. A thread is alive if it has been started and has not yet died. 241 * <p> 242 * If thread memory allocation measurement is enabled after the thread has started, the Java 243 * virtual machine implementation may choose any time up to and including the time that the 244 * capability is enabled as the point where thread memory allocation measurement starts. 245 * 246 * @param id the thread ID of a thread 247 * @return an approximation of the total memory allocated, in bytes, in heap memory for a thread 248 * of the specified ID if the thread of the specified ID exists, the thread is alive, 249 * and thread memory allocation measurement is enabled; {@code -1} otherwise. 250 * 251 * @throws IllegalArgumentException if {@code id} {@code <=} {@code 0}. 252 * @throws UnsupportedOperationException if the Java virtual machine implementation does not 253 * {@linkplain #isThreadAllocatedMemorySupported() support} thread memory allocation 254 * measurement. 255 */ 256 public static long getThreadAllocatedBytes(long id) { 257 JMXService jmx = JMXService.instance; 258 if (jmx == null) { 259 throw new UnsupportedOperationException(); 260 } 261 return jmx.getThreadAllocatedBytes(id); 262 } 263 264 /** 265 * Convenience method for calling {@link #getThreadAllocatedBytes(long)} with the id of the 266 * current thread. 267 */ 268 public static long getCurrentThreadAllocatedBytes() { 269 return getThreadAllocatedBytes(currentThread().getId()); 270 } 271 272 /** 273 * Returns the total CPU time for the current thread in nanoseconds. The returned value is of 274 * nanoseconds precision but not necessarily nanoseconds accuracy. If the implementation 275 * distinguishes between user mode time and system mode time, the returned CPU time is the 276 * amount of time that the current thread has executed in user mode or system mode. 277 * 278 * @return the total CPU time for the current thread if CPU time measurement is enabled; 279 * {@code -1} otherwise. 280 * 281 * @throws UnsupportedOperationException if the Java virtual machine does not 282 * {@linkplain #isCurrentThreadCpuTimeSupported() support} CPU time measurement for 283 * the current thread 284 */ 285 public static long getCurrentThreadCpuTime() { 286 JMXService jmx = JMXService.instance; 287 if (jmx == null) { 288 throw new UnsupportedOperationException(); 289 } 290 return jmx.getCurrentThreadCpuTime(); 291 } 292 293 /** 294 * Determines if the Java virtual machine implementation supports thread memory allocation 295 * measurement. 296 */ 297 public static boolean isThreadAllocatedMemorySupported() { 298 JMXService jmx = JMXService.instance; 299 if (jmx == null) { 300 return false; 301 } 302 return jmx.isThreadAllocatedMemorySupported(); 303 } 304 305 /** 306 * Determines if the Java virtual machine supports CPU time measurement for the current thread. 307 */ 308 public static boolean isCurrentThreadCpuTimeSupported() { 309 JMXService jmx = JMXService.instance; 310 if (jmx == null) { 311 return false; 312 } 313 return jmx.isCurrentThreadCpuTimeSupported(); 314 } 315 316 /** 317 * Gets the input arguments passed to the Java virtual machine which does not include the 318 * arguments to the {@code main} method. This method returns an empty list if there is no input 319 * argument to the Java virtual machine. 320 * <p> 321 * Some Java virtual machine implementations may take input arguments from multiple different 322 * sources: for examples, arguments passed from the application that launches the Java virtual 323 * machine such as the 'java' command, environment variables, configuration files, etc. 324 * <p> 325 * Typically, not all command-line options to the 'java' command are passed to the Java virtual 326 * machine. Thus, the returned input arguments may not include all command-line options. 327 * 328 * @return the input arguments to the JVM or {@code null} if they are unavailable 329 */ 330 public static List<String> getInputArguments() { 331 JMXService jmx = JMXService.instance; 332 if (jmx == null) { 333 return null; 334 } 335 return jmx.getInputArguments(); 336 } 337 338 private static final Method constantPoolLookupReferencedType; 339 340 static { 341 Method lookupReferencedType = null; 342 Class<?> constantPool = ConstantPool.class; 343 try { 344 lookupReferencedType = constantPool.getDeclaredMethod("lookupReferencedType", Integer.TYPE, Integer.TYPE); 345 } catch (NoSuchMethodException e) { 346 } 347 constantPoolLookupReferencedType = lookupReferencedType; 348 } 349 350 public static JavaType lookupReferencedType(ConstantPool constantPool, int cpi, int opcode) { 351 if (constantPoolLookupReferencedType != null) { 352 try { 353 return (JavaType) constantPoolLookupReferencedType.invoke(constantPool, cpi, opcode); 354 } catch (Error e) { 355 throw e; 356 } catch (Throwable throwable) { 357 throw new InternalError(throwable); 358 } 359 } 360 throw new InternalError("This JVMCI version doesn't support ConstantPool.lookupReferencedType()"); 361 } 362 363 public static boolean hasLookupReferencedType() { 364 return constantPoolLookupReferencedType != null; 365 } 366 } 367