Context.java revision 1709:39dececd7338
1/* 2 * Copyright (c) 2010, 2013, 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 26package jdk.nashorn.internal.runtime; 27 28import static jdk.internal.org.objectweb.asm.Opcodes.V1_7; 29import static jdk.nashorn.internal.codegen.CompilerConstants.CONSTANTS; 30import static jdk.nashorn.internal.codegen.CompilerConstants.CREATE_PROGRAM_FUNCTION; 31import static jdk.nashorn.internal.codegen.CompilerConstants.SOURCE; 32import static jdk.nashorn.internal.codegen.CompilerConstants.STRICT_MODE; 33import static jdk.nashorn.internal.runtime.CodeStore.newCodeStore; 34import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 35import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; 36import static jdk.nashorn.internal.runtime.Source.sourceFor; 37 38import java.io.File; 39import java.io.InputStream; 40import java.io.IOException; 41import java.io.PrintWriter; 42import java.io.UncheckedIOException; 43import java.lang.invoke.MethodHandle; 44import java.lang.invoke.MethodHandles; 45import java.lang.invoke.MethodType; 46import java.lang.invoke.SwitchPoint; 47import java.lang.ref.ReferenceQueue; 48import java.lang.ref.SoftReference; 49import java.lang.module.Configuration; 50import java.lang.module.ModuleDescriptor; 51import java.lang.module.ModuleFinder; 52import java.lang.module.ModuleReference; 53import java.lang.reflect.Field; 54import java.lang.reflect.Layer; 55import java.lang.reflect.Modifier; 56import java.lang.reflect.Module; 57import java.net.MalformedURLException; 58import java.net.URL; 59import java.security.AccessControlContext; 60import java.security.AccessController; 61import java.security.CodeSigner; 62import java.security.CodeSource; 63import java.security.Permissions; 64import java.security.PrivilegedAction; 65import java.security.PrivilegedActionException; 66import java.security.PrivilegedExceptionAction; 67import java.security.ProtectionDomain; 68import java.util.Collection; 69import java.util.HashMap; 70import java.util.HashSet; 71import java.util.LinkedHashMap; 72import java.util.Map; 73import java.util.Objects; 74import java.util.Optional; 75import java.util.Set; 76import java.util.concurrent.ConcurrentHashMap; 77import java.util.concurrent.ConcurrentMap; 78import java.util.concurrent.atomic.AtomicLong; 79import java.util.concurrent.atomic.AtomicReference; 80import java.util.concurrent.atomic.LongAdder; 81import java.util.function.Consumer; 82import java.util.function.Supplier; 83import java.util.logging.Level; 84import javax.script.ScriptEngine; 85import jdk.dynalink.DynamicLinker; 86import jdk.internal.org.objectweb.asm.ClassReader; 87import jdk.internal.org.objectweb.asm.ClassWriter; 88import jdk.internal.org.objectweb.asm.Opcodes; 89import jdk.internal.org.objectweb.asm.util.CheckClassAdapter; 90import jdk.nashorn.api.scripting.ClassFilter; 91import jdk.nashorn.api.scripting.ScriptObjectMirror; 92import jdk.nashorn.internal.WeakValueCache; 93import jdk.nashorn.internal.codegen.Compiler; 94import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; 95import jdk.nashorn.internal.codegen.ObjectClassGenerator; 96import jdk.nashorn.internal.ir.FunctionNode; 97import jdk.nashorn.internal.ir.debug.ASTWriter; 98import jdk.nashorn.internal.ir.debug.PrintVisitor; 99import jdk.nashorn.internal.lookup.MethodHandleFactory; 100import jdk.nashorn.internal.objects.Global; 101import jdk.nashorn.internal.parser.Parser; 102import jdk.nashorn.internal.runtime.events.RuntimeEvent; 103import jdk.nashorn.internal.runtime.linker.Bootstrap; 104import jdk.nashorn.internal.runtime.logging.DebugLogger; 105import jdk.nashorn.internal.runtime.logging.Loggable; 106import jdk.nashorn.internal.runtime.logging.Logger; 107import jdk.nashorn.internal.runtime.options.LoggingOption.LoggerInfo; 108import jdk.nashorn.internal.runtime.options.Options; 109import jdk.internal.misc.Unsafe; 110 111/** 112 * This class manages the global state of execution. Context is immutable. 113 */ 114public final class Context { 115 // nashorn specific security runtime access permission names 116 /** 117 * Permission needed to pass arbitrary nashorn command line options when creating Context. 118 */ 119 public static final String NASHORN_SET_CONFIG = "nashorn.setConfig"; 120 121 /** 122 * Permission needed to create Nashorn Context instance. 123 */ 124 public static final String NASHORN_CREATE_CONTEXT = "nashorn.createContext"; 125 126 /** 127 * Permission needed to create Nashorn Global instance. 128 */ 129 public static final String NASHORN_CREATE_GLOBAL = "nashorn.createGlobal"; 130 131 /** 132 * Permission to get current Nashorn Context from thread local storage. 133 */ 134 public static final String NASHORN_GET_CONTEXT = "nashorn.getContext"; 135 136 /** 137 * Permission to use Java reflection/jsr292 from script code. 138 */ 139 public static final String NASHORN_JAVA_REFLECTION = "nashorn.JavaReflection"; 140 141 /** 142 * Permission to create a new Module 143 */ 144 public static final String NASHORN_CREATE_MODULE = "nashorn.createModule"; 145 146 /** 147 * Permission to enable nashorn debug mode. 148 */ 149 public static final String NASHORN_DEBUG_MODE = "nashorn.debugMode"; 150 151 // nashorn load psuedo URL prefixes 152 private static final String LOAD_CLASSPATH = "classpath:"; 153 private static final String LOAD_FX = "fx:"; 154 private static final String LOAD_NASHORN = "nashorn:"; 155 156 private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup(); 157 private static final MethodType CREATE_PROGRAM_FUNCTION_TYPE = MethodType.methodType(ScriptFunction.class, ScriptObject.class); 158 159 private static final LongAdder NAMED_INSTALLED_SCRIPT_COUNT = new LongAdder(); 160 private static final LongAdder ANONYMOUS_INSTALLED_SCRIPT_COUNT = new LongAdder(); 161 162 /** 163 * Should scripts use only object slots for fields, or dual long/object slots? The default 164 * behaviour is to couple this to optimistic types, using dual representation if optimistic types are enabled 165 * and single field representation otherwise. This can be overridden by setting either the "nashorn.fields.objects" 166 * or "nashorn.fields.dual" system property. 167 */ 168 private final FieldMode fieldMode; 169 170 private static enum FieldMode { 171 /** Value for automatic field representation depending on optimistic types setting */ 172 AUTO, 173 /** Value for object field representation regardless of optimistic types setting */ 174 OBJECTS, 175 /** Value for dual primitive/object field representation regardless of optimistic types setting */ 176 DUAL 177 } 178 179 /** 180 * Keeps track of which builtin prototypes and properties have been relinked 181 * Currently we are conservative and associate the name of a builtin class with all 182 * its properties, so it's enough to invalidate a property to break all assumptions 183 * about a prototype. This can be changed to a more fine grained approach, but no one 184 * ever needs this, given the very rare occurrence of swapping out only parts of 185 * a builtin v.s. the entire builtin object 186 */ 187 private final Map<String, SwitchPoint> builtinSwitchPoints = new HashMap<>(); 188 189 /* Force DebuggerSupport to be loaded. */ 190 static { 191 DebuggerSupport.FORCELOAD = true; 192 } 193 194 static long getNamedInstalledScriptCount() { 195 return NAMED_INSTALLED_SCRIPT_COUNT.sum(); 196 } 197 198 static long getAnonymousInstalledScriptCount() { 199 return ANONYMOUS_INSTALLED_SCRIPT_COUNT.sum(); 200 } 201 202 /** 203 * ContextCodeInstaller that has the privilege of installing classes in the Context. 204 * Can only be instantiated from inside the context and is opaque to other classes 205 */ 206 private abstract static class ContextCodeInstaller implements CodeInstaller { 207 final Context context; 208 final CodeSource codeSource; 209 210 ContextCodeInstaller(final Context context, final CodeSource codeSource) { 211 this.context = context; 212 this.codeSource = codeSource; 213 } 214 215 @Override 216 public Context getContext() { 217 return context; 218 } 219 220 @Override 221 public void initialize(final Collection<Class<?>> classes, final Source source, final Object[] constants) { 222 try { 223 AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() { 224 @Override 225 public Void run() throws Exception { 226 for (final Class<?> clazz : classes) { 227 //use reflection to write source and constants table to installed classes 228 final Field sourceField = clazz.getDeclaredField(SOURCE.symbolName()); 229 sourceField.setAccessible(true); 230 sourceField.set(null, source); 231 232 final Field constantsField = clazz.getDeclaredField(CONSTANTS.symbolName()); 233 constantsField.setAccessible(true); 234 constantsField.set(null, constants); 235 } 236 return null; 237 } 238 }); 239 } catch (final PrivilegedActionException e) { 240 throw new RuntimeException(e); 241 } 242 } 243 244 @Override 245 public void verify(final byte[] code) { 246 context.verify(code); 247 } 248 249 @Override 250 public long getUniqueScriptId() { 251 return context.getUniqueScriptId(); 252 } 253 254 @Override 255 public void storeScript(final String cacheKey, final Source source, final String mainClassName, 256 final Map<String,byte[]> classBytes, final Map<Integer, FunctionInitializer> initializers, 257 final Object[] constants, final int compilationId) { 258 if (context.codeStore != null) { 259 context.codeStore.store(cacheKey, source, mainClassName, classBytes, initializers, constants, compilationId); 260 } 261 } 262 263 @Override 264 public StoredScript loadScript(final Source source, final String functionKey) { 265 if (context.codeStore != null) { 266 return context.codeStore.load(source, functionKey); 267 } 268 return null; 269 } 270 271 @Override 272 public boolean isCompatibleWith(final CodeInstaller other) { 273 if (other instanceof ContextCodeInstaller) { 274 final ContextCodeInstaller cci = (ContextCodeInstaller)other; 275 return cci.context == context && cci.codeSource == codeSource; 276 } 277 return false; 278 } 279 } 280 281 private static class NamedContextCodeInstaller extends ContextCodeInstaller { 282 private final ScriptLoader loader; 283 private int usageCount = 0; 284 private int bytesDefined = 0; 285 286 // We reuse this installer for 10 compilations or 200000 defined bytes. Usually the first condition 287 // will occur much earlier, the second is a safety measure for very large scripts/functions. 288 private final static int MAX_USAGES = 10; 289 private final static int MAX_BYTES_DEFINED = 200_000; 290 291 private NamedContextCodeInstaller(final Context context, final CodeSource codeSource, final ScriptLoader loader) { 292 super(context, codeSource); 293 this.loader = loader; 294 } 295 296 @Override 297 public Class<?> install(final String className, final byte[] bytecode) { 298 usageCount++; 299 bytesDefined += bytecode.length; 300 NAMED_INSTALLED_SCRIPT_COUNT.increment(); 301 return loader.installClass(Compiler.binaryName(className), bytecode, codeSource); 302 } 303 304 @Override 305 public CodeInstaller getOnDemandCompilationInstaller() { 306 // Reuse this installer if we're within our limits. 307 if (usageCount < MAX_USAGES && bytesDefined < MAX_BYTES_DEFINED) { 308 return this; 309 } 310 return new NamedContextCodeInstaller(context, codeSource, context.createNewLoader()); 311 } 312 313 @Override 314 public CodeInstaller getMultiClassCodeInstaller() { 315 // This installer is perfectly suitable for installing multiple classes that reference each other 316 // as it produces classes with resolvable names, all defined in a single class loader. 317 return this; 318 } 319 } 320 321 private final WeakValueCache<CodeSource, Class<?>> anonymousHostClasses = new WeakValueCache<>(); 322 323 private static final class AnonymousContextCodeInstaller extends ContextCodeInstaller { 324 private static final Unsafe UNSAFE = getUnsafe(); 325 private static final String ANONYMOUS_HOST_CLASS_NAME = Compiler.SCRIPTS_PACKAGE.replace('/', '.') + ".AnonymousHost"; 326 private static final byte[] ANONYMOUS_HOST_CLASS_BYTES = getAnonymousHostClassBytes(); 327 328 private final Class<?> hostClass; 329 330 private AnonymousContextCodeInstaller(final Context context, final CodeSource codeSource, final Class<?> hostClass) { 331 super(context, codeSource); 332 this.hostClass = hostClass; 333 } 334 335 @Override 336 public Class<?> install(final String className, final byte[] bytecode) { 337 ANONYMOUS_INSTALLED_SCRIPT_COUNT.increment(); 338 return UNSAFE.defineAnonymousClass(hostClass, bytecode, null); 339 } 340 341 @Override 342 public CodeInstaller getOnDemandCompilationInstaller() { 343 // This code loader can be indefinitely reused for on-demand recompilations for the same code source. 344 return this; 345 } 346 347 @Override 348 public CodeInstaller getMultiClassCodeInstaller() { 349 // This code loader can not be used to install multiple classes that reference each other, as they 350 // would have no resolvable names. Therefore, in such situation we must revert to an installer that 351 // produces named classes. 352 return new NamedContextCodeInstaller(context, codeSource, context.createNewLoader()); 353 } 354 355 private static byte[] getAnonymousHostClassBytes() { 356 final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS); 357 cw.visit(V1_7, Opcodes.ACC_INTERFACE | Opcodes.ACC_ABSTRACT, ANONYMOUS_HOST_CLASS_NAME.replace('.', '/'), null, "java/lang/Object", null); 358 cw.visitEnd(); 359 return cw.toByteArray(); 360 } 361 362 private static Unsafe getUnsafe() { 363 return AccessController.doPrivileged(new PrivilegedAction<Unsafe>() { 364 @Override 365 public Unsafe run() { 366 try { 367 final Field theUnsafeField = Unsafe.class.getDeclaredField("theUnsafe"); 368 theUnsafeField.setAccessible(true); 369 return (Unsafe)theUnsafeField.get(null); 370 } catch (final ReflectiveOperationException e) { 371 throw new RuntimeException(e); 372 } 373 } 374 }); 375 } 376 } 377 378 /** Is Context global debug mode enabled ? */ 379 public static final boolean DEBUG = Options.getBooleanProperty("nashorn.debug"); 380 381 private static final ThreadLocal<Global> currentGlobal = new ThreadLocal<>(); 382 383 // in-memory cache for loaded classes 384 private ClassCache classCache; 385 386 // persistent code store 387 private CodeStore codeStore; 388 389 // A factory for linking global properties as constant method handles. It is created when the first Global 390 // is created, and invalidated forever once the second global is created. 391 private final AtomicReference<GlobalConstants> globalConstantsRef = new AtomicReference<>(); 392 393 /** 394 * Get the current global scope 395 * @return the current global scope 396 */ 397 public static Global getGlobal() { 398 // This class in a package.access protected package. 399 // Trusted code only can call this method. 400 return currentGlobal.get(); 401 } 402 403 /** 404 * Set the current global scope 405 * @param global the global scope 406 */ 407 public static void setGlobal(final ScriptObject global) { 408 if (global != null && !(global instanceof Global)) { 409 throw new IllegalArgumentException("not a global!"); 410 } 411 setGlobal((Global)global); 412 } 413 414 /** 415 * Set the current global scope 416 * @param global the global scope 417 */ 418 public static void setGlobal(final Global global) { 419 // This class in a package.access protected package. 420 // Trusted code only can call this method. 421 assert getGlobal() != global; 422 //same code can be cached between globals, then we need to invalidate method handle constants 423 if (global != null) { 424 final GlobalConstants globalConstants = getContext(global).getGlobalConstants(); 425 if (globalConstants != null) { 426 globalConstants.invalidateAll(); 427 } 428 } 429 currentGlobal.set(global); 430 } 431 432 /** 433 * Get context of the current global 434 * @return current global scope's context. 435 */ 436 public static Context getContext() { 437 final SecurityManager sm = System.getSecurityManager(); 438 if (sm != null) { 439 sm.checkPermission(new RuntimePermission(NASHORN_GET_CONTEXT)); 440 } 441 return getContextTrusted(); 442 } 443 444 /** 445 * Get current context's error writer 446 * 447 * @return error writer of the current context 448 */ 449 public static PrintWriter getCurrentErr() { 450 final ScriptObject global = getGlobal(); 451 return (global != null)? global.getContext().getErr() : new PrintWriter(System.err); 452 } 453 454 /** 455 * Output text to this Context's error stream 456 * @param str text to write 457 */ 458 public static void err(final String str) { 459 err(str, true); 460 } 461 462 /** 463 * Output text to this Context's error stream, optionally with 464 * a newline afterwards 465 * 466 * @param str text to write 467 * @param crlf write a carriage return/new line after text 468 */ 469 public static void err(final String str, final boolean crlf) { 470 final PrintWriter err = Context.getCurrentErr(); 471 if (err != null) { 472 if (crlf) { 473 err.println(str); 474 } else { 475 err.print(str); 476 } 477 } 478 } 479 480 /** Current environment. */ 481 private final ScriptEnvironment env; 482 483 /** is this context in strict mode? Cached from env. as this is used heavily. */ 484 final boolean _strict; 485 486 /** class loader to resolve classes from script. */ 487 private final ClassLoader appLoader; 488 489 /** Class loader to load classes compiled from scripts. */ 490 private final ScriptLoader scriptLoader; 491 492 /** Dynamic linker for linking call sites in script code loaded by this context */ 493 private final DynamicLinker dynamicLinker; 494 495 /** Current error manager. */ 496 private final ErrorManager errors; 497 498 /** Unique id for script. Used only when --loader-per-compile=false */ 499 private final AtomicLong uniqueScriptId; 500 501 /** Optional class filter to use for Java classes. Can be null. */ 502 private final ClassFilter classFilter; 503 504 private static final StructureLoader sharedLoader; 505 private static final ConcurrentMap<String, Class<?>> structureClasses = new ConcurrentHashMap<>(); 506 507 /*package-private*/ @SuppressWarnings("static-method") 508 StructureLoader getSharedLoader() { 509 return sharedLoader; 510 } 511 512 private static AccessControlContext createNoPermAccCtxt() { 513 return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, new Permissions()) }); 514 } 515 516 private static AccessControlContext createPermAccCtxt(final String permName) { 517 final Permissions perms = new Permissions(); 518 perms.add(new RuntimePermission(permName)); 519 return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) }); 520 } 521 522 private static final AccessControlContext NO_PERMISSIONS_ACC_CTXT = createNoPermAccCtxt(); 523 private static final AccessControlContext CREATE_LOADER_ACC_CTXT = createPermAccCtxt("createClassLoader"); 524 private static final AccessControlContext CREATE_GLOBAL_ACC_CTXT = createPermAccCtxt(NASHORN_CREATE_GLOBAL); 525 private static final AccessControlContext GET_LOADER_ACC_CTXT = createPermAccCtxt("getClassLoader"); 526 527 static { 528 final ClassLoader myLoader = Context.class.getClassLoader(); 529 sharedLoader = AccessController.doPrivileged(new PrivilegedAction<StructureLoader>() { 530 @Override 531 public StructureLoader run() { 532 return new StructureLoader(myLoader); 533 } 534 }, CREATE_LOADER_ACC_CTXT); 535 } 536 537 /** 538 * ThrowErrorManager that throws ParserException upon error conditions. 539 */ 540 public static class ThrowErrorManager extends ErrorManager { 541 @Override 542 public void error(final String message) { 543 throw new ParserException(message); 544 } 545 546 @Override 547 public void error(final ParserException e) { 548 throw e; 549 } 550 } 551 552 /** 553 * Constructor 554 * 555 * @param options options from command line or Context creator 556 * @param errors error manger 557 * @param appLoader application class loader 558 */ 559 public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader) { 560 this(options, errors, appLoader, null); 561 } 562 563 /** 564 * Constructor 565 * 566 * @param options options from command line or Context creator 567 * @param errors error manger 568 * @param appLoader application class loader 569 * @param classFilter class filter to use 570 */ 571 public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader, final ClassFilter classFilter) { 572 this(options, errors, new PrintWriter(System.out, true), new PrintWriter(System.err, true), appLoader, classFilter); 573 } 574 575 /** 576 * Constructor 577 * 578 * @param options options from command line or Context creator 579 * @param errors error manger 580 * @param out output writer for this Context 581 * @param err error writer for this Context 582 * @param appLoader application class loader 583 */ 584 public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader) { 585 this(options, errors, out, err, appLoader, (ClassFilter)null); 586 } 587 588 /** 589 * Constructor 590 * 591 * @param options options from command line or Context creator 592 * @param errors error manger 593 * @param out output writer for this Context 594 * @param err error writer for this Context 595 * @param appLoader application class loader 596 * @param classFilter class filter to use 597 */ 598 public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader, final ClassFilter classFilter) { 599 final SecurityManager sm = System.getSecurityManager(); 600 if (sm != null) { 601 sm.checkPermission(new RuntimePermission(NASHORN_CREATE_CONTEXT)); 602 } 603 604 this.classFilter = classFilter; 605 this.env = new ScriptEnvironment(options, out, err); 606 this._strict = env._strict; 607 if (env._loader_per_compile) { 608 this.scriptLoader = null; 609 this.uniqueScriptId = null; 610 } else { 611 this.scriptLoader = createNewLoader(); 612 this.uniqueScriptId = new AtomicLong(); 613 } 614 this.errors = errors; 615 616 // if user passed -classpath option, make a URLClassLoader with that and 617 // the app loader as the parent. 618 final String classPath = options.getString("classpath"); 619 if (!env._compile_only && classPath != null && !classPath.isEmpty()) { 620 // make sure that caller can create a class loader. 621 if (sm != null) { 622 sm.checkCreateClassLoader(); 623 } 624 this.appLoader = NashornLoader.createClassLoader(classPath, appLoader); 625 } else { 626 this.appLoader = appLoader; 627 } 628 this.dynamicLinker = Bootstrap.createDynamicLinker(this.appLoader, env._unstable_relink_threshold); 629 630 final int cacheSize = env._class_cache_size; 631 if (cacheSize > 0) { 632 classCache = new ClassCache(this, cacheSize); 633 } 634 635 if (env._persistent_cache) { 636 codeStore = newCodeStore(this); 637 } 638 639 // print version info if asked. 640 if (env._version) { 641 getErr().println("nashorn " + Version.version()); 642 } 643 644 if (env._fullversion) { 645 getErr().println("nashorn full version " + Version.fullVersion()); 646 } 647 648 if (Options.getBooleanProperty("nashorn.fields.dual")) { 649 fieldMode = FieldMode.DUAL; 650 } else if (Options.getBooleanProperty("nashorn.fields.objects")) { 651 fieldMode = FieldMode.OBJECTS; 652 } else { 653 fieldMode = FieldMode.AUTO; 654 } 655 656 initLoggers(); 657 } 658 659 660 /** 661 * Get the class filter for this context 662 * @return class filter 663 */ 664 public ClassFilter getClassFilter() { 665 return classFilter; 666 } 667 668 /** 669 * Returns the factory for constant method handles for global properties. The returned factory can be 670 * invalidated if this Context has more than one Global. 671 * @return the factory for constant method handles for global properties. 672 */ 673 GlobalConstants getGlobalConstants() { 674 return globalConstantsRef.get(); 675 } 676 677 /** 678 * Get the error manager for this context 679 * @return error manger 680 */ 681 public ErrorManager getErrorManager() { 682 return errors; 683 } 684 685 /** 686 * Get the script environment for this context 687 * @return script environment 688 */ 689 public ScriptEnvironment getEnv() { 690 return env; 691 } 692 693 /** 694 * Get the output stream for this context 695 * @return output print writer 696 */ 697 public PrintWriter getOut() { 698 return env.getOut(); 699 } 700 701 /** 702 * Get the error stream for this context 703 * @return error print writer 704 */ 705 public PrintWriter getErr() { 706 return env.getErr(); 707 } 708 709 /** 710 * Should scripts compiled by this context use dual field representation? 711 * @return true if using dual fields, false for object-only fields 712 */ 713 public boolean useDualFields() { 714 return fieldMode == FieldMode.DUAL || (fieldMode == FieldMode.AUTO && env._optimistic_types); 715 } 716 717 /** 718 * Get the PropertyMap of the current global scope 719 * @return the property map of the current global scope 720 */ 721 public static PropertyMap getGlobalMap() { 722 return Context.getGlobal().getMap(); 723 } 724 725 /** 726 * Compile a top level script. 727 * 728 * @param source the source 729 * @param scope the scope 730 * 731 * @return top level function for script 732 */ 733 public ScriptFunction compileScript(final Source source, final ScriptObject scope) { 734 return compileScript(source, scope, this.errors); 735 } 736 737 /** 738 * Interface to represent compiled code that can be re-used across many 739 * global scope instances 740 */ 741 public static interface MultiGlobalCompiledScript { 742 /** 743 * Obtain script function object for a specific global scope object. 744 * 745 * @param newGlobal global scope for which function object is obtained 746 * @return script function for script level expressions 747 */ 748 public ScriptFunction getFunction(final Global newGlobal); 749 } 750 751 /** 752 * Compile a top level script. 753 * 754 * @param source the script source 755 * @return reusable compiled script across many global scopes. 756 */ 757 public MultiGlobalCompiledScript compileScript(final Source source) { 758 final Class<?> clazz = compile(source, this.errors, this._strict, false); 759 final MethodHandle createProgramFunctionHandle = getCreateProgramFunctionHandle(clazz); 760 761 return new MultiGlobalCompiledScript() { 762 @Override 763 public ScriptFunction getFunction(final Global newGlobal) { 764 return invokeCreateProgramFunctionHandle(createProgramFunctionHandle, newGlobal); 765 } 766 }; 767 } 768 769 /** 770 * Entry point for {@code eval} 771 * 772 * @param initialScope The scope of this eval call 773 * @param string Evaluated code as a String 774 * @param callThis "this" to be passed to the evaluated code 775 * @param location location of the eval call 776 * @return the return value of the {@code eval} 777 */ 778 public Object eval(final ScriptObject initialScope, final String string, 779 final Object callThis, final Object location) { 780 return eval(initialScope, string, callThis, location, false, false); 781 } 782 783 /** 784 * Entry point for {@code eval} 785 * 786 * @param initialScope The scope of this eval call 787 * @param string Evaluated code as a String 788 * @param callThis "this" to be passed to the evaluated code 789 * @param location location of the eval call 790 * @param strict is this {@code eval} call from a strict mode code? 791 * @param evalCall is this called from "eval" builtin? 792 * 793 * @return the return value of the {@code eval} 794 */ 795 public Object eval(final ScriptObject initialScope, final String string, 796 final Object callThis, final Object location, final boolean strict, final boolean evalCall) { 797 final String file = location == UNDEFINED || location == null ? "<eval>" : location.toString(); 798 final Source source = sourceFor(file, string, evalCall); 799 // is this direct 'eval' builtin call? 800 final boolean directEval = evalCall && (location != UNDEFINED); 801 final Global global = Context.getGlobal(); 802 ScriptObject scope = initialScope; 803 804 // ECMA section 10.1.1 point 2 says eval code is strict if it begins 805 // with "use strict" directive or eval direct call itself is made 806 // from from strict mode code. We are passed with caller's strict mode. 807 // Nashorn extension: any 'eval' is unconditionally strict when -strict is specified. 808 boolean strictFlag = strict || this._strict; 809 810 Class<?> clazz; 811 try { 812 clazz = compile(source, new ThrowErrorManager(), strictFlag, true); 813 } catch (final ParserException e) { 814 e.throwAsEcmaException(global); 815 return null; 816 } 817 818 if (!strictFlag) { 819 // We need to get strict mode flag from compiled class. This is 820 // because eval code may start with "use strict" directive. 821 try { 822 strictFlag = clazz.getField(STRICT_MODE.symbolName()).getBoolean(null); 823 } catch (final NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { 824 //ignored 825 strictFlag = false; 826 } 827 } 828 829 // In strict mode, eval does not instantiate variables and functions 830 // in the caller's environment. A new environment is created! 831 if (strictFlag) { 832 // Create a new scope object with given scope as its prototype 833 scope = newScope(scope); 834 } 835 836 final ScriptFunction func = getProgramFunction(clazz, scope); 837 Object evalThis; 838 if (directEval) { 839 evalThis = (callThis != UNDEFINED && callThis != null) || strictFlag ? callThis : global; 840 } else { 841 // either indirect evalCall or non-eval (Function, engine.eval, ScriptObjectMirror.eval..) 842 evalThis = callThis; 843 } 844 845 return ScriptRuntime.apply(func, evalThis); 846 } 847 848 private static ScriptObject newScope(final ScriptObject callerScope) { 849 return new Scope(callerScope, PropertyMap.newMap(Scope.class)); 850 } 851 852 private static Source loadInternal(final String srcStr, final String prefix, final String resourcePath) { 853 if (srcStr.startsWith(prefix)) { 854 final String resource = resourcePath + srcStr.substring(prefix.length()); 855 // NOTE: even sandbox scripts should be able to load scripts in nashorn: scheme 856 // These scripts are always available and are loaded from nashorn.jar's resources. 857 return AccessController.doPrivileged( 858 new PrivilegedAction<Source>() { 859 @Override 860 public Source run() { 861 try { 862 final InputStream resStream = Context.class.getResourceAsStream(resource); 863 return resStream != null ? sourceFor(srcStr, Source.readFully(resStream)) : null; 864 } catch (final IOException exp) { 865 return null; 866 } 867 } 868 }); 869 } 870 871 return null; 872 } 873 874 /** 875 * Implementation of {@code load} Nashorn extension. Load a script file from a source 876 * expression 877 * 878 * @param scope the scope 879 * @param from source expression for script 880 * 881 * @return return value for load call (undefined) 882 * 883 * @throws IOException if source cannot be found or loaded 884 */ 885 public Object load(final Object scope, final Object from) throws IOException { 886 final Object src = from instanceof ConsString ? from.toString() : from; 887 Source source = null; 888 889 // load accepts a String (which could be a URL or a file name), a File, a URL 890 // or a ScriptObject that has "name" and "source" (string valued) properties. 891 if (src instanceof String) { 892 final String srcStr = (String)src; 893 if (srcStr.startsWith(LOAD_CLASSPATH)) { 894 final URL url = getResourceURL(srcStr.substring(LOAD_CLASSPATH.length())); 895 source = url != null ? sourceFor(url.toString(), url) : null; 896 } else { 897 final File file = new File(srcStr); 898 if (srcStr.indexOf(':') != -1) { 899 if ((source = loadInternal(srcStr, LOAD_NASHORN, "resources/")) == null && 900 (source = loadInternal(srcStr, LOAD_FX, "resources/fx/")) == null) { 901 URL url; 902 try { 903 //check for malformed url. if malformed, it may still be a valid file 904 url = new URL(srcStr); 905 } catch (final MalformedURLException e) { 906 url = file.toURI().toURL(); 907 } 908 source = sourceFor(url.toString(), url); 909 } 910 } else if (file.isFile()) { 911 source = sourceFor(srcStr, file); 912 } 913 } 914 } else if (src instanceof File && ((File)src).isFile()) { 915 final File file = (File)src; 916 source = sourceFor(file.getName(), file); 917 } else if (src instanceof URL) { 918 final URL url = (URL)src; 919 source = sourceFor(url.toString(), url); 920 } else if (src instanceof ScriptObject) { 921 final ScriptObject sobj = (ScriptObject)src; 922 if (sobj.has("script") && sobj.has("name")) { 923 final String script = JSType.toString(sobj.get("script")); 924 final String name = JSType.toString(sobj.get("name")); 925 source = sourceFor(name, script); 926 } 927 } else if (src instanceof Map) { 928 final Map<?,?> map = (Map<?,?>)src; 929 if (map.containsKey("script") && map.containsKey("name")) { 930 final String script = JSType.toString(map.get("script")); 931 final String name = JSType.toString(map.get("name")); 932 source = sourceFor(name, script); 933 } 934 } 935 936 if (source != null) { 937 if (scope instanceof ScriptObject && ((ScriptObject)scope).isScope()) { 938 final ScriptObject sobj = (ScriptObject)scope; 939 // passed object is a script object 940 // Global is the only user accessible scope ScriptObject 941 assert sobj.isGlobal() : "non-Global scope object!!"; 942 return evaluateSource(source, sobj, sobj); 943 } else if (scope == null || scope == UNDEFINED) { 944 // undefined or null scope. Use current global instance. 945 final Global global = getGlobal(); 946 return evaluateSource(source, global, global); 947 } else { 948 /* 949 * Arbitrary object passed for scope. 950 * Indirect load that is equivalent to: 951 * 952 * (function(scope, source) { 953 * with (scope) { 954 * eval(<script_from_source>); 955 * } 956 * })(scope, source); 957 */ 958 final Global global = getGlobal(); 959 // Create a new object. This is where all declarations 960 // (var, function) from the evaluated code go. 961 // make global to be its __proto__ so that global 962 // definitions are accessible to the evaluated code. 963 final ScriptObject evalScope = newScope(global); 964 965 // finally, make a WithObject around user supplied scope object 966 // so that it's properties are accessible as variables. 967 final ScriptObject withObj = ScriptRuntime.openWith(evalScope, scope); 968 969 // evaluate given source with 'withObj' as scope 970 // but use global object as "this". 971 return evaluateSource(source, withObj, global); 972 } 973 } 974 975 throw typeError("cant.load.script", ScriptRuntime.safeToString(from)); 976 } 977 978 /** 979 * Implementation of {@code loadWithNewGlobal} Nashorn extension. Load a script file from a source 980 * expression, after creating a new global scope. 981 * 982 * @param from source expression for script 983 * @param args (optional) arguments to be passed to the loaded script 984 * 985 * @return return value for load call (undefined) 986 * 987 * @throws IOException if source cannot be found or loaded 988 */ 989 public Object loadWithNewGlobal(final Object from, final Object...args) throws IOException { 990 final Global oldGlobal = getGlobal(); 991 final Global newGlobal = AccessController.doPrivileged(new PrivilegedAction<Global>() { 992 @Override 993 public Global run() { 994 try { 995 return newGlobal(); 996 } catch (final RuntimeException e) { 997 if (Context.DEBUG) { 998 e.printStackTrace(); 999 } 1000 throw e; 1001 } 1002 } 1003 }, CREATE_GLOBAL_ACC_CTXT); 1004 // initialize newly created Global instance 1005 initGlobal(newGlobal); 1006 setGlobal(newGlobal); 1007 1008 final Object[] wrapped = args == null? ScriptRuntime.EMPTY_ARRAY : ScriptObjectMirror.wrapArray(args, oldGlobal); 1009 newGlobal.put("arguments", newGlobal.wrapAsObject(wrapped), env._strict); 1010 1011 try { 1012 // wrap objects from newGlobal's world as mirrors - but if result 1013 // is from oldGlobal's world, unwrap it! 1014 return ScriptObjectMirror.unwrap(ScriptObjectMirror.wrap(load(newGlobal, from), newGlobal), oldGlobal); 1015 } finally { 1016 setGlobal(oldGlobal); 1017 } 1018 } 1019 1020 /** 1021 * Load or get a structure class. Structure class names are based on the number of parameter fields 1022 * and {@link AccessorProperty} fields in them. Structure classes are used to represent ScriptObjects 1023 * 1024 * @see ObjectClassGenerator 1025 * @see AccessorProperty 1026 * @see ScriptObject 1027 * 1028 * @param fullName full name of class, e.g. jdk.nashorn.internal.objects.JO2P1 contains 2 fields and 1 parameter. 1029 * 1030 * @return the {@code Class<?>} for this structure 1031 * 1032 * @throws ClassNotFoundException if structure class cannot be resolved 1033 */ 1034 @SuppressWarnings("unchecked") 1035 public static Class<? extends ScriptObject> forStructureClass(final String fullName) throws ClassNotFoundException { 1036 if (System.getSecurityManager() != null && !StructureLoader.isStructureClass(fullName)) { 1037 throw new ClassNotFoundException(fullName); 1038 } 1039 return (Class<? extends ScriptObject>)structureClasses.computeIfAbsent(fullName, (name) -> { 1040 try { 1041 return Class.forName(name, true, sharedLoader); 1042 } catch (final ClassNotFoundException e) { 1043 throw new AssertionError(e); 1044 } 1045 }); 1046 } 1047 1048 /** 1049 * Is {@code className} the name of a structure class? 1050 * 1051 * @param className a class name 1052 * @return true if className is a structure class name 1053 */ 1054 public static boolean isStructureClass(final String className) { 1055 return StructureLoader.isStructureClass(className); 1056 } 1057 1058 /** 1059 * Checks that the given Class can be accessed from no permissions context. 1060 * 1061 * @param clazz Class object 1062 * @throws SecurityException if not accessible 1063 */ 1064 public static void checkPackageAccess(final Class<?> clazz) { 1065 final SecurityManager sm = System.getSecurityManager(); 1066 if (sm != null) { 1067 Class<?> bottomClazz = clazz; 1068 while (bottomClazz.isArray()) { 1069 bottomClazz = bottomClazz.getComponentType(); 1070 } 1071 checkPackageAccess(sm, bottomClazz.getName()); 1072 } 1073 } 1074 1075 /** 1076 * Checks that the given package name can be accessed from no permissions context. 1077 * 1078 * @param pkgName package name 1079 * @throws SecurityException if not accessible 1080 */ 1081 public static void checkPackageAccess(final String pkgName) { 1082 final SecurityManager sm = System.getSecurityManager(); 1083 if (sm != null) { 1084 checkPackageAccess(sm, pkgName.endsWith(".") ? pkgName : pkgName + "."); 1085 } 1086 } 1087 1088 /** 1089 * Checks that the given package can be accessed from no permissions context. 1090 * 1091 * @param sm current security manager instance 1092 * @param fullName fully qualified package name 1093 * @throw SecurityException if not accessible 1094 */ 1095 private static void checkPackageAccess(final SecurityManager sm, final String fullName) { 1096 Objects.requireNonNull(sm); 1097 final int index = fullName.lastIndexOf('.'); 1098 if (index != -1) { 1099 final String pkgName = fullName.substring(0, index); 1100 AccessController.doPrivileged(new PrivilegedAction<Void>() { 1101 @Override 1102 public Void run() { 1103 sm.checkPackageAccess(pkgName); 1104 return null; 1105 } 1106 }, NO_PERMISSIONS_ACC_CTXT); 1107 } 1108 } 1109 1110 /** 1111 * Checks that the given Class can be accessed from no permissions context. 1112 * 1113 * @param clazz Class object 1114 * @return true if package is accessible, false otherwise 1115 */ 1116 private static boolean isAccessiblePackage(final Class<?> clazz) { 1117 try { 1118 checkPackageAccess(clazz); 1119 return true; 1120 } catch (final SecurityException se) { 1121 return false; 1122 } 1123 } 1124 1125 /** 1126 * Checks that the given Class is public and it can be accessed from no permissions context. 1127 * 1128 * @param clazz Class object to check 1129 * @return true if Class is accessible, false otherwise 1130 */ 1131 public static boolean isAccessibleClass(final Class<?> clazz) { 1132 return Modifier.isPublic(clazz.getModifiers()) && Context.isAccessiblePackage(clazz); 1133 } 1134 1135 /** 1136 * Lookup a Java class. This is used for JSR-223 stuff linking in from 1137 * {@code jdk.nashorn.internal.objects.NativeJava} and {@code jdk.nashorn.internal.runtime.NativeJavaPackage} 1138 * 1139 * @param fullName full name of class to load 1140 * 1141 * @return the {@code Class<?>} for the name 1142 * 1143 * @throws ClassNotFoundException if class cannot be resolved 1144 */ 1145 public Class<?> findClass(final String fullName) throws ClassNotFoundException { 1146 if (fullName.indexOf('[') != -1 || fullName.indexOf('/') != -1) { 1147 // don't allow array class names or internal names. 1148 throw new ClassNotFoundException(fullName); 1149 } 1150 1151 // give chance to ClassFilter to filter out, if present 1152 if (classFilter != null && !classFilter.exposeToScripts(fullName)) { 1153 throw new ClassNotFoundException(fullName); 1154 } 1155 1156 // check package access as soon as possible! 1157 final SecurityManager sm = System.getSecurityManager(); 1158 if (sm != null) { 1159 checkPackageAccess(sm, fullName); 1160 } 1161 1162 // Try finding using the "app" loader. 1163 return Class.forName(fullName, true, appLoader); 1164 } 1165 1166 /** 1167 * Hook to print stack trace for a {@link Throwable} that occurred during 1168 * execution 1169 * 1170 * @param t throwable for which to dump stack 1171 */ 1172 public static void printStackTrace(final Throwable t) { 1173 if (Context.DEBUG) { 1174 t.printStackTrace(Context.getCurrentErr()); 1175 } 1176 } 1177 1178 /** 1179 * Verify generated bytecode before emission. This is called back from the 1180 * {@link ObjectClassGenerator} or the {@link Compiler}. If the "--verify-code" parameter 1181 * hasn't been given, this is a nop 1182 * 1183 * Note that verification may load classes -- we don't want to do that unless 1184 * user specified verify option. We check it here even though caller 1185 * may have already checked that flag 1186 * 1187 * @param bytecode bytecode to verify 1188 */ 1189 public void verify(final byte[] bytecode) { 1190 if (env._verify_code) { 1191 // No verification when security manager is around as verifier 1192 // may load further classes - which should be avoided. 1193 if (System.getSecurityManager() == null) { 1194 CheckClassAdapter.verify(new ClassReader(bytecode), sharedLoader, false, new PrintWriter(System.err, true)); 1195 } 1196 } 1197 } 1198 1199 /** 1200 * Create and initialize a new global scope object. 1201 * 1202 * @return the initialized global scope object. 1203 */ 1204 public Global createGlobal() { 1205 return initGlobal(newGlobal()); 1206 } 1207 1208 /** 1209 * Create a new uninitialized global scope object 1210 * @return the global script object 1211 */ 1212 public Global newGlobal() { 1213 createOrInvalidateGlobalConstants(); 1214 return new Global(this); 1215 } 1216 1217 private void createOrInvalidateGlobalConstants() { 1218 for (;;) { 1219 final GlobalConstants currentGlobalConstants = getGlobalConstants(); 1220 if (currentGlobalConstants != null) { 1221 // Subsequent invocation; we're creating our second or later Global. GlobalConstants is not safe to use 1222 // with more than one Global, as the constant method handle linkages it creates create a coupling 1223 // between the Global and the call sites in the compiled code. 1224 currentGlobalConstants.invalidateForever(); 1225 return; 1226 } 1227 final GlobalConstants newGlobalConstants = new GlobalConstants(getLogger(GlobalConstants.class)); 1228 if (globalConstantsRef.compareAndSet(null, newGlobalConstants)) { 1229 // First invocation; we're creating the first Global in this Context. Create the GlobalConstants object 1230 // for this Context. 1231 return; 1232 } 1233 1234 // If we reach here, then we started out as the first invocation, but another concurrent invocation won the 1235 // CAS race. We'll just let the loop repeat and invalidate the CAS race winner. 1236 } 1237 } 1238 1239 /** 1240 * Initialize given global scope object. 1241 * 1242 * @param global the global 1243 * @param engine the associated ScriptEngine instance, can be null 1244 * @return the initialized global scope object. 1245 */ 1246 public Global initGlobal(final Global global, final ScriptEngine engine) { 1247 // Need only minimal global object, if we are just compiling. 1248 if (!env._compile_only) { 1249 final Global oldGlobal = Context.getGlobal(); 1250 try { 1251 Context.setGlobal(global); 1252 // initialize global scope with builtin global objects 1253 global.initBuiltinObjects(engine); 1254 } finally { 1255 Context.setGlobal(oldGlobal); 1256 } 1257 } 1258 1259 return global; 1260 } 1261 1262 /** 1263 * Initialize given global scope object. 1264 * 1265 * @param global the global 1266 * @return the initialized global scope object. 1267 */ 1268 public Global initGlobal(final Global global) { 1269 return initGlobal(global, null); 1270 } 1271 1272 /** 1273 * Return the current global's context 1274 * @return current global's context 1275 */ 1276 static Context getContextTrusted() { 1277 return getContext(getGlobal()); 1278 } 1279 1280 /** 1281 * Gets the Nashorn dynamic linker for the specified class. If the class is 1282 * a script class, the dynamic linker associated with its context is 1283 * returned. Otherwise the dynamic linker associated with the current 1284 * context is returned. 1285 * @param clazz the class for which we want to retrieve a dynamic linker. 1286 * @return the Nashorn dynamic linker for the specified class. 1287 */ 1288 public static DynamicLinker getDynamicLinker(final Class<?> clazz) { 1289 return fromClass(clazz).dynamicLinker; 1290 } 1291 1292 /** 1293 * Gets the Nashorn dynamic linker associated with the current context. 1294 * @return the Nashorn dynamic linker for the current context. 1295 */ 1296 public static DynamicLinker getDynamicLinker() { 1297 return getContextTrusted().dynamicLinker; 1298 } 1299 1300 /** 1301 * Creates a module layer with one module that is defined to the given class 1302 * loader. 1303 * 1304 * @param descriptor the module descriptor for the newly created module 1305 * @param loader the class loader of the module 1306 * @return the new Module 1307 */ 1308 public static Module createModule(final ModuleDescriptor descriptor, final ClassLoader loader) { 1309 final SecurityManager sm = System.getSecurityManager(); 1310 if (sm != null) { 1311 sm.checkPermission(new RuntimePermission(NASHORN_CREATE_MODULE)); 1312 } 1313 return createModuleTrusted(descriptor, loader); 1314 } 1315 1316 /** 1317 * Creates a module layer with one module that is defined to the given class 1318 * loader. 1319 * 1320 * @param descriptor the module descriptor for the newly created module 1321 * @param loader the class loader of the module 1322 * @return the new Module 1323 */ 1324 static Module createModuleTrusted(final ModuleDescriptor descriptor, final ClassLoader loader) { 1325 return createModuleTrusted(Layer.boot(), descriptor, loader); 1326 } 1327 1328 /** 1329 * Creates a module layer with one module that is defined to the given class 1330 * loader. 1331 * 1332 * @param parent the parent layer of the new module 1333 * @param descriptor the module descriptor for the newly created module 1334 * @param loader the class loader of the module 1335 * @return the new Module 1336 */ 1337 static Module createModuleTrusted(final Layer parent, final ModuleDescriptor descriptor, final ClassLoader loader) { 1338 final String mn = descriptor.name(); 1339 1340 final ModuleReference mref = new ModuleReference(descriptor, null, () -> { 1341 IOException ioe = new IOException("<dynamic module>"); 1342 throw new UncheckedIOException(ioe); 1343 }); 1344 1345 final ModuleFinder finder = new ModuleFinder() { 1346 @Override 1347 public Optional<ModuleReference> find(String name) { 1348 if (name.equals(mn)) { 1349 return Optional.of(mref); 1350 } else { 1351 return Optional.empty(); 1352 } 1353 } 1354 @Override 1355 public Set<ModuleReference> findAll() { 1356 return Set.of(mref); 1357 } 1358 }; 1359 1360 final Configuration cf = parent.configuration() 1361 .resolveRequires(finder, ModuleFinder.of(), Set.of(mn)); 1362 1363 final PrivilegedAction<Layer> pa = () -> parent.defineModules(cf, name -> loader); 1364 final Layer layer = AccessController.doPrivileged(pa, GET_LOADER_ACC_CTXT); 1365 1366 final Module m = layer.findModule(mn).get(); 1367 assert m.getLayer() == layer; 1368 1369 return m; 1370 } 1371 1372 static Context getContextTrustedOrNull() { 1373 final Global global = Context.getGlobal(); 1374 return global == null ? null : getContext(global); 1375 } 1376 1377 private static Context getContext(final Global global) { 1378 // We can't invoke Global.getContext() directly, as it's a protected override, and Global isn't in our package. 1379 // In order to access the method, we must cast it to ScriptObject first (which is in our package) and then let 1380 // virtual invocation do its thing. 1381 return ((ScriptObject)global).getContext(); 1382 } 1383 1384 /** 1385 * Try to infer Context instance from the Class. If we cannot, 1386 * then get it from the thread local variable. 1387 * 1388 * @param clazz the class 1389 * @return context 1390 */ 1391 static Context fromClass(final Class<?> clazz) { 1392 ClassLoader loader = null; 1393 try { 1394 loader = clazz.getClassLoader(); 1395 } catch (SecurityException ignored) { 1396 // This could fail because of anonymous classes being used. 1397 // Accessing loader of anonymous class fails (for extension 1398 // loader class too?). In any case, for us fetching Context 1399 // from class loader is just an optimization. We can always 1400 // get Context from thread local storage (below). 1401 } 1402 1403 if (loader instanceof ScriptLoader) { 1404 return ((ScriptLoader)loader).getContext(); 1405 } 1406 1407 return Context.getContextTrusted(); 1408 } 1409 1410 private URL getResourceURL(final String resName) { 1411 if (appLoader != null) { 1412 return appLoader.getResource(resName); 1413 } 1414 return ClassLoader.getSystemResource(resName); 1415 } 1416 1417 private Object evaluateSource(final Source source, final ScriptObject scope, final ScriptObject thiz) { 1418 ScriptFunction script = null; 1419 1420 try { 1421 script = compileScript(source, scope, new Context.ThrowErrorManager()); 1422 } catch (final ParserException e) { 1423 e.throwAsEcmaException(); 1424 } 1425 1426 return ScriptRuntime.apply(script, thiz); 1427 } 1428 1429 private static ScriptFunction getProgramFunction(final Class<?> script, final ScriptObject scope) { 1430 if (script == null) { 1431 return null; 1432 } 1433 return invokeCreateProgramFunctionHandle(getCreateProgramFunctionHandle(script), scope); 1434 } 1435 1436 private static MethodHandle getCreateProgramFunctionHandle(final Class<?> script) { 1437 try { 1438 return LOOKUP.findStatic(script, CREATE_PROGRAM_FUNCTION.symbolName(), CREATE_PROGRAM_FUNCTION_TYPE); 1439 } catch (NoSuchMethodException | IllegalAccessException e) { 1440 throw new AssertionError("Failed to retrieve a handle for the program function for " + script.getName(), e); 1441 } 1442 } 1443 1444 private static ScriptFunction invokeCreateProgramFunctionHandle(final MethodHandle createProgramFunctionHandle, final ScriptObject scope) { 1445 try { 1446 return (ScriptFunction)createProgramFunctionHandle.invokeExact(scope); 1447 } catch (final RuntimeException|Error e) { 1448 throw e; 1449 } catch (final Throwable t) { 1450 throw new AssertionError("Failed to create a program function", t); 1451 } 1452 } 1453 1454 private ScriptFunction compileScript(final Source source, final ScriptObject scope, final ErrorManager errMan) { 1455 return getProgramFunction(compile(source, errMan, this._strict, false), scope); 1456 } 1457 1458 private synchronized Class<?> compile(final Source source, final ErrorManager errMan, final boolean strict, final boolean isEval) { 1459 // start with no errors, no warnings. 1460 errMan.reset(); 1461 1462 Class<?> script = findCachedClass(source); 1463 if (script != null) { 1464 final DebugLogger log = getLogger(Compiler.class); 1465 if (log.isEnabled()) { 1466 log.fine(new RuntimeEvent<>(Level.INFO, source), "Code cache hit for ", source, " avoiding recompile."); 1467 } 1468 return script; 1469 } 1470 1471 StoredScript storedScript = null; 1472 FunctionNode functionNode = null; 1473 // Don't use code store if optimistic types is enabled but lazy compilation is not. 1474 // This would store a full script compilation with many wrong optimistic assumptions that would 1475 // do more harm than good on later runs with both optimistic types and lazy compilation enabled. 1476 final boolean useCodeStore = codeStore != null && !env._parse_only && (!env._optimistic_types || env._lazy_compilation); 1477 final String cacheKey = useCodeStore ? CodeStore.getCacheKey("script", null) : null; 1478 1479 if (useCodeStore) { 1480 storedScript = codeStore.load(source, cacheKey); 1481 } 1482 1483 if (storedScript == null) { 1484 if (env._dest_dir != null) { 1485 source.dump(env._dest_dir); 1486 } 1487 1488 functionNode = new Parser(env, source, errMan, strict, getLogger(Parser.class)).parse(); 1489 1490 if (errMan.hasErrors()) { 1491 return null; 1492 } 1493 1494 if (env._print_ast || functionNode.getDebugFlag(FunctionNode.DEBUG_PRINT_AST)) { 1495 getErr().println(new ASTWriter(functionNode)); 1496 } 1497 1498 if (env._print_parse || functionNode.getDebugFlag(FunctionNode.DEBUG_PRINT_PARSE)) { 1499 getErr().println(new PrintVisitor(functionNode, true, false)); 1500 } 1501 } 1502 1503 if (env._parse_only) { 1504 return null; 1505 } 1506 1507 final URL url = source.getURL(); 1508 final CodeSource cs = new CodeSource(url, (CodeSigner[])null); 1509 final CodeInstaller installer; 1510 if (!env.useAnonymousClasses(isEval) || env._persistent_cache || !env._lazy_compilation) { 1511 // Persistent code cache and eager compilation preclude use of VM anonymous classes 1512 final ScriptLoader loader = env._loader_per_compile ? createNewLoader() : scriptLoader; 1513 installer = new NamedContextCodeInstaller(this, cs, loader); 1514 } else { 1515 installer = new AnonymousContextCodeInstaller(this, cs, 1516 anonymousHostClasses.getOrCreate(cs, (key) -> 1517 createNewLoader().installClass( 1518 // NOTE: we're defining these constants in AnonymousContextCodeInstaller so they are not 1519 // initialized if we don't use AnonymousContextCodeInstaller. As this method is only ever 1520 // invoked from AnonymousContextCodeInstaller, this is okay. 1521 AnonymousContextCodeInstaller.ANONYMOUS_HOST_CLASS_NAME, 1522 AnonymousContextCodeInstaller.ANONYMOUS_HOST_CLASS_BYTES, cs))); 1523 } 1524 1525 if (storedScript == null) { 1526 final CompilationPhases phases = Compiler.CompilationPhases.COMPILE_ALL; 1527 1528 final Compiler compiler = Compiler.forInitialCompilation( 1529 installer, 1530 source, 1531 errMan, 1532 strict | functionNode.isStrict()); 1533 1534 final FunctionNode compiledFunction = compiler.compile(functionNode, phases); 1535 if (errMan.hasErrors()) { 1536 return null; 1537 } 1538 script = compiledFunction.getRootClass(); 1539 compiler.persistClassInfo(cacheKey, compiledFunction); 1540 } else { 1541 Compiler.updateCompilationId(storedScript.getCompilationId()); 1542 script = storedScript.installScript(source, installer); 1543 } 1544 1545 cacheClass(source, script); 1546 return script; 1547 } 1548 1549 private ScriptLoader createNewLoader() { 1550 return AccessController.doPrivileged( 1551 new PrivilegedAction<ScriptLoader>() { 1552 @Override 1553 public ScriptLoader run() { 1554 return new ScriptLoader(appLoader, Context.this); 1555 } 1556 }, CREATE_LOADER_ACC_CTXT); 1557 } 1558 1559 private long getUniqueScriptId() { 1560 return uniqueScriptId.getAndIncrement(); 1561 } 1562 1563 /** 1564 * Cache for compiled script classes. 1565 */ 1566 @SuppressWarnings("serial") 1567 @Logger(name="classcache") 1568 private static class ClassCache extends LinkedHashMap<Source, ClassReference> implements Loggable { 1569 private final int size; 1570 private final ReferenceQueue<Class<?>> queue; 1571 private final DebugLogger log; 1572 1573 ClassCache(final Context context, final int size) { 1574 super(size, 0.75f, true); 1575 this.size = size; 1576 this.queue = new ReferenceQueue<>(); 1577 this.log = initLogger(context); 1578 } 1579 1580 void cache(final Source source, final Class<?> clazz) { 1581 if (log.isEnabled()) { 1582 log.info("Caching ", source, " in class cache"); 1583 } 1584 put(source, new ClassReference(clazz, queue, source)); 1585 } 1586 1587 @Override 1588 protected boolean removeEldestEntry(final Map.Entry<Source, ClassReference> eldest) { 1589 return size() > size; 1590 } 1591 1592 @Override 1593 public ClassReference get(final Object key) { 1594 for (ClassReference ref; (ref = (ClassReference)queue.poll()) != null; ) { 1595 final Source source = ref.source; 1596 if (log.isEnabled()) { 1597 log.info("Evicting ", source, " from class cache."); 1598 } 1599 remove(source); 1600 } 1601 1602 final ClassReference ref = super.get(key); 1603 if (ref != null && log.isEnabled()) { 1604 log.info("Retrieved class reference for ", ref.source, " from class cache"); 1605 } 1606 return ref; 1607 } 1608 1609 @Override 1610 public DebugLogger initLogger(final Context context) { 1611 return context.getLogger(getClass()); 1612 } 1613 1614 @Override 1615 public DebugLogger getLogger() { 1616 return log; 1617 } 1618 1619 } 1620 1621 private static class ClassReference extends SoftReference<Class<?>> { 1622 private final Source source; 1623 1624 ClassReference(final Class<?> clazz, final ReferenceQueue<Class<?>> queue, final Source source) { 1625 super(clazz, queue); 1626 this.source = source; 1627 } 1628 } 1629 1630 // Class cache management 1631 private Class<?> findCachedClass(final Source source) { 1632 final ClassReference ref = classCache == null ? null : classCache.get(source); 1633 return ref != null ? ref.get() : null; 1634 } 1635 1636 private void cacheClass(final Source source, final Class<?> clazz) { 1637 if (classCache != null) { 1638 classCache.cache(source, clazz); 1639 } 1640 } 1641 1642 // logging 1643 private final Map<String, DebugLogger> loggers = new HashMap<>(); 1644 1645 private void initLoggers() { 1646 ((Loggable)MethodHandleFactory.getFunctionality()).initLogger(this); 1647 } 1648 1649 /** 1650 * Get a logger, given a loggable class 1651 * @param clazz a Loggable class 1652 * @return debuglogger associated with that class 1653 */ 1654 public DebugLogger getLogger(final Class<? extends Loggable> clazz) { 1655 return getLogger(clazz, null); 1656 } 1657 1658 /** 1659 * Get a logger, given a loggable class 1660 * @param clazz a Loggable class 1661 * @param initHook an init hook - if this is the first time the logger is created in the context, run the init hook 1662 * @return debuglogger associated with that class 1663 */ 1664 public DebugLogger getLogger(final Class<? extends Loggable> clazz, final Consumer<DebugLogger> initHook) { 1665 final String name = getLoggerName(clazz); 1666 DebugLogger logger = loggers.get(name); 1667 if (logger == null) { 1668 if (!env.hasLogger(name)) { 1669 return DebugLogger.DISABLED_LOGGER; 1670 } 1671 final LoggerInfo info = env._loggers.get(name); 1672 logger = new DebugLogger(name, info.getLevel(), info.isQuiet()); 1673 if (initHook != null) { 1674 initHook.accept(logger); 1675 } 1676 loggers.put(name, logger); 1677 } 1678 return logger; 1679 } 1680 1681 /** 1682 * Given a Loggable class, weave debug info info a method handle for that logger. 1683 * Level.INFO is used 1684 * 1685 * @param clazz loggable 1686 * @param mh method handle 1687 * @param text debug printout to add 1688 * 1689 * @return instrumented method handle, or null if logger not enabled 1690 */ 1691 public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final MethodHandle mh, final Supplier<String> text) { 1692 return addLoggingToHandle(clazz, Level.INFO, mh, Integer.MAX_VALUE, false, text); 1693 } 1694 1695 /** 1696 * Given a Loggable class, weave debug info info a method handle for that logger. 1697 * 1698 * @param clazz loggable 1699 * @param level log level 1700 * @param mh method handle 1701 * @param paramStart first parameter to print 1702 * @param printReturnValue should we print the return value? 1703 * @param text debug printout to add 1704 * 1705 * @return instrumented method handle, or null if logger not enabled 1706 */ 1707 public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final Level level, final MethodHandle mh, final int paramStart, final boolean printReturnValue, final Supplier<String> text) { 1708 final DebugLogger log = getLogger(clazz); 1709 if (log.isEnabled()) { 1710 return MethodHandleFactory.addDebugPrintout(log, level, mh, paramStart, printReturnValue, text.get()); 1711 } 1712 return mh; 1713 } 1714 1715 private static String getLoggerName(final Class<?> clazz) { 1716 Class<?> current = clazz; 1717 while (current != null) { 1718 final Logger log = current.getAnnotation(Logger.class); 1719 if (log != null) { 1720 assert !"".equals(log.name()); 1721 return log.name(); 1722 } 1723 current = current.getSuperclass(); 1724 } 1725 assert false; 1726 return null; 1727 } 1728 1729 /** 1730 * This is a special kind of switchpoint used to guard builtin 1731 * properties and prototypes. In the future it might contain 1732 * logic to e.g. multiple switchpoint classes. 1733 */ 1734 public static final class BuiltinSwitchPoint extends SwitchPoint { 1735 //empty 1736 } 1737 1738 /** 1739 * Create a new builtin switchpoint and return it 1740 * @param name key name 1741 * @return new builtin switchpoint 1742 */ 1743 public SwitchPoint newBuiltinSwitchPoint(final String name) { 1744 assert builtinSwitchPoints.get(name) == null; 1745 final SwitchPoint sp = new BuiltinSwitchPoint(); 1746 builtinSwitchPoints.put(name, sp); 1747 return sp; 1748 } 1749 1750 /** 1751 * Return the builtin switchpoint for a particular key name 1752 * @param name key name 1753 * @return builtin switchpoint or null if none 1754 */ 1755 public SwitchPoint getBuiltinSwitchPoint(final String name) { 1756 return builtinSwitchPoints.get(name); 1757 } 1758} 1759