Context.java revision 1318:5808c1886a90
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.nashorn.internal.codegen.CompilerConstants.CONSTANTS; 29import static jdk.nashorn.internal.codegen.CompilerConstants.CREATE_PROGRAM_FUNCTION; 30import static jdk.nashorn.internal.codegen.CompilerConstants.SOURCE; 31import static jdk.nashorn.internal.codegen.CompilerConstants.STRICT_MODE; 32import static jdk.nashorn.internal.runtime.CodeStore.newCodeStore; 33import static jdk.nashorn.internal.runtime.ECMAErrors.typeError; 34import static jdk.nashorn.internal.runtime.ScriptRuntime.UNDEFINED; 35import static jdk.nashorn.internal.runtime.Source.sourceFor; 36 37import java.io.File; 38import java.io.IOException; 39import java.io.PrintWriter; 40import java.lang.invoke.MethodHandle; 41import java.lang.invoke.MethodHandles; 42import java.lang.invoke.MethodType; 43import java.lang.invoke.SwitchPoint; 44import java.lang.ref.ReferenceQueue; 45import java.lang.ref.SoftReference; 46import java.lang.reflect.Field; 47import java.lang.reflect.Modifier; 48import java.net.MalformedURLException; 49import java.net.URL; 50import java.security.AccessControlContext; 51import java.security.AccessController; 52import java.security.CodeSigner; 53import java.security.CodeSource; 54import java.security.Permissions; 55import java.security.PrivilegedAction; 56import java.security.PrivilegedActionException; 57import java.security.PrivilegedExceptionAction; 58import java.security.ProtectionDomain; 59import java.util.Collection; 60import java.util.HashMap; 61import java.util.LinkedHashMap; 62import java.util.Map; 63import java.util.Objects; 64import java.util.concurrent.atomic.AtomicLong; 65import java.util.concurrent.atomic.AtomicReference; 66import java.util.function.Consumer; 67import java.util.function.Supplier; 68import java.util.logging.Level; 69import javax.script.ScriptContext; 70import javax.script.ScriptEngine; 71import jdk.internal.org.objectweb.asm.ClassReader; 72import jdk.internal.org.objectweb.asm.util.CheckClassAdapter; 73import jdk.nashorn.api.scripting.ClassFilter; 74import jdk.nashorn.api.scripting.ScriptObjectMirror; 75import jdk.nashorn.internal.codegen.Compiler; 76import jdk.nashorn.internal.codegen.Compiler.CompilationPhases; 77import jdk.nashorn.internal.codegen.ObjectClassGenerator; 78import jdk.nashorn.internal.ir.FunctionNode; 79import jdk.nashorn.internal.ir.debug.ASTWriter; 80import jdk.nashorn.internal.ir.debug.PrintVisitor; 81import jdk.nashorn.internal.lookup.MethodHandleFactory; 82import jdk.nashorn.internal.objects.Global; 83import jdk.nashorn.internal.parser.Parser; 84import jdk.nashorn.internal.runtime.events.RuntimeEvent; 85import jdk.nashorn.internal.runtime.logging.DebugLogger; 86import jdk.nashorn.internal.runtime.logging.Loggable; 87import jdk.nashorn.internal.runtime.logging.Logger; 88import jdk.nashorn.internal.runtime.options.LoggingOption.LoggerInfo; 89import jdk.nashorn.internal.runtime.options.Options; 90 91/** 92 * This class manages the global state of execution. Context is immutable. 93 */ 94public final class Context { 95 // nashorn specific security runtime access permission names 96 /** 97 * Permission needed to pass arbitrary nashorn command line options when creating Context. 98 */ 99 public static final String NASHORN_SET_CONFIG = "nashorn.setConfig"; 100 101 /** 102 * Permission needed to create Nashorn Context instance. 103 */ 104 public static final String NASHORN_CREATE_CONTEXT = "nashorn.createContext"; 105 106 /** 107 * Permission needed to create Nashorn Global instance. 108 */ 109 public static final String NASHORN_CREATE_GLOBAL = "nashorn.createGlobal"; 110 111 /** 112 * Permission to get current Nashorn Context from thread local storage. 113 */ 114 public static final String NASHORN_GET_CONTEXT = "nashorn.getContext"; 115 116 /** 117 * Permission to use Java reflection/jsr292 from script code. 118 */ 119 public static final String NASHORN_JAVA_REFLECTION = "nashorn.JavaReflection"; 120 121 /** 122 * Permission to enable nashorn debug mode. 123 */ 124 public static final String NASHORN_DEBUG_MODE = "nashorn.debugMode"; 125 126 // nashorn load psuedo URL prefixes 127 private static final String LOAD_CLASSPATH = "classpath:"; 128 private static final String LOAD_FX = "fx:"; 129 private static final String LOAD_NASHORN = "nashorn:"; 130 131 private static MethodHandles.Lookup LOOKUP = MethodHandles.lookup(); 132 private static MethodType CREATE_PROGRAM_FUNCTION_TYPE = MethodType.methodType(ScriptFunction.class, ScriptObject.class); 133 134 /** 135 * Should scripts use only object slots for fields, or dual long/object slots? The default 136 * behaviour is to couple this to optimistic types, using dual representation if optimistic types are enabled 137 * and single field representation otherwise. This can be overridden by setting either the "nashorn.fields.objects" 138 * or "nashorn.fields.dual" system property. 139 */ 140 private final FieldMode fieldMode; 141 142 private static enum FieldMode { 143 /** Value for automatic field representation depending on optimistic types setting */ 144 AUTO, 145 /** Value for object field representation regardless of optimistic types setting */ 146 OBJECTS, 147 /** Value for dual primitive/object field representation regardless of optimistic types setting */ 148 DUAL 149 } 150 151 /** 152 * Keeps track of which builtin prototypes and properties have been relinked 153 * Currently we are conservative and associate the name of a builtin class with all 154 * its properties, so it's enough to invalidate a property to break all assumptions 155 * about a prototype. This can be changed to a more fine grained approach, but no one 156 * ever needs this, given the very rare occurance of swapping out only parts of 157 * a builtin v.s. the entire builtin object 158 */ 159 private final Map<String, SwitchPoint> builtinSwitchPoints = new HashMap<>(); 160 161 /* Force DebuggerSupport to be loaded. */ 162 static { 163 DebuggerSupport.FORCELOAD = true; 164 } 165 166 /** 167 * ContextCodeInstaller that has the privilege of installing classes in the Context. 168 * Can only be instantiated from inside the context and is opaque to other classes 169 */ 170 public static class ContextCodeInstaller implements CodeInstaller<ScriptEnvironment> { 171 private final Context context; 172 private final ScriptLoader loader; 173 private final CodeSource codeSource; 174 private int usageCount = 0; 175 private int bytesDefined = 0; 176 177 // We reuse this installer for 10 compilations or 200000 defined bytes. Usually the first condition 178 // will occur much earlier, the second is a safety measure for very large scripts/functions. 179 private final static int MAX_USAGES = 10; 180 private final static int MAX_BYTES_DEFINED = 200_000; 181 182 private ContextCodeInstaller(final Context context, final ScriptLoader loader, final CodeSource codeSource) { 183 this.context = context; 184 this.loader = loader; 185 this.codeSource = codeSource; 186 } 187 188 /** 189 * Return the script environment for this installer 190 * @return ScriptEnvironment 191 */ 192 @Override 193 public ScriptEnvironment getOwner() { 194 return context.env; 195 } 196 197 @Override 198 public Class<?> install(final String className, final byte[] bytecode) { 199 usageCount++; 200 bytesDefined += bytecode.length; 201 final String binaryName = Compiler.binaryName(className); 202 return loader.installClass(binaryName, bytecode, codeSource); 203 } 204 205 @Override 206 public void initialize(final Collection<Class<?>> classes, final Source source, final Object[] constants) { 207 try { 208 AccessController.doPrivileged(new PrivilegedExceptionAction<Void>() { 209 @Override 210 public Void run() throws Exception { 211 for (final Class<?> clazz : classes) { 212 //use reflection to write source and constants table to installed classes 213 final Field sourceField = clazz.getDeclaredField(SOURCE.symbolName()); 214 sourceField.setAccessible(true); 215 sourceField.set(null, source); 216 217 final Field constantsField = clazz.getDeclaredField(CONSTANTS.symbolName()); 218 constantsField.setAccessible(true); 219 constantsField.set(null, constants); 220 } 221 return null; 222 } 223 }); 224 } catch (final PrivilegedActionException e) { 225 throw new RuntimeException(e); 226 } 227 } 228 229 @Override 230 public void verify(final byte[] code) { 231 context.verify(code); 232 } 233 234 @Override 235 public long getUniqueScriptId() { 236 return context.getUniqueScriptId(); 237 } 238 239 @Override 240 public void storeScript(final String cacheKey, final Source source, final String mainClassName, 241 final Map<String,byte[]> classBytes, final Map<Integer, FunctionInitializer> initializers, 242 final Object[] constants, final int compilationId) { 243 if (context.codeStore != null) { 244 context.codeStore.store(cacheKey, source, mainClassName, classBytes, initializers, constants, compilationId); 245 } 246 } 247 248 @Override 249 public StoredScript loadScript(final Source source, final String functionKey) { 250 if (context.codeStore != null) { 251 return context.codeStore.load(source, functionKey); 252 } 253 return null; 254 } 255 256 @Override 257 public CodeInstaller<ScriptEnvironment> withNewLoader() { 258 // Reuse this installer if we're within our limits. 259 if (usageCount < MAX_USAGES && bytesDefined < MAX_BYTES_DEFINED) { 260 return this; 261 } 262 return new ContextCodeInstaller(context, context.createNewLoader(), codeSource); 263 } 264 265 @Override 266 public boolean isCompatibleWith(final CodeInstaller<ScriptEnvironment> other) { 267 if (other instanceof ContextCodeInstaller) { 268 final ContextCodeInstaller cci = (ContextCodeInstaller)other; 269 return cci.context == context && cci.codeSource == codeSource; 270 } 271 return false; 272 } 273 } 274 275 /** Is Context global debug mode enabled ? */ 276 public static final boolean DEBUG = Options.getBooleanProperty("nashorn.debug"); 277 278 private static final ThreadLocal<Global> currentGlobal = new ThreadLocal<>(); 279 280 // in-memory cache for loaded classes 281 private ClassCache classCache; 282 283 // persistent code store 284 private CodeStore codeStore; 285 286 // A factory for linking global properties as constant method handles. It is created when the first Global 287 // is created, and invalidated forever once the second global is created. 288 private final AtomicReference<GlobalConstants> globalConstantsRef = new AtomicReference<>(); 289 290 /** 291 * Get the current global scope 292 * @return the current global scope 293 */ 294 public static Global getGlobal() { 295 // This class in a package.access protected package. 296 // Trusted code only can call this method. 297 return currentGlobal.get(); 298 } 299 300 /** 301 * Set the current global scope 302 * @param global the global scope 303 */ 304 public static void setGlobal(final ScriptObject global) { 305 if (global != null && !(global instanceof Global)) { 306 throw new IllegalArgumentException("not a global!"); 307 } 308 setGlobal((Global)global); 309 } 310 311 /** 312 * Set the current global scope 313 * @param global the global scope 314 */ 315 public static void setGlobal(final Global global) { 316 // This class in a package.access protected package. 317 // Trusted code only can call this method. 318 assert getGlobal() != global; 319 //same code can be cached between globals, then we need to invalidate method handle constants 320 if (global != null) { 321 final GlobalConstants globalConstants = getContext(global).getGlobalConstants(); 322 if (globalConstants != null) { 323 globalConstants.invalidateAll(); 324 } 325 } 326 currentGlobal.set(global); 327 } 328 329 /** 330 * Get context of the current global 331 * @return current global scope's context. 332 */ 333 public static Context getContext() { 334 final SecurityManager sm = System.getSecurityManager(); 335 if (sm != null) { 336 sm.checkPermission(new RuntimePermission(NASHORN_GET_CONTEXT)); 337 } 338 return getContextTrusted(); 339 } 340 341 /** 342 * Get current context's error writer 343 * 344 * @return error writer of the current context 345 */ 346 public static PrintWriter getCurrentErr() { 347 final ScriptObject global = getGlobal(); 348 return (global != null)? global.getContext().getErr() : new PrintWriter(System.err); 349 } 350 351 /** 352 * Output text to this Context's error stream 353 * @param str text to write 354 */ 355 public static void err(final String str) { 356 err(str, true); 357 } 358 359 /** 360 * Output text to this Context's error stream, optionally with 361 * a newline afterwards 362 * 363 * @param str text to write 364 * @param crlf write a carriage return/new line after text 365 */ 366 public static void err(final String str, final boolean crlf) { 367 final PrintWriter err = Context.getCurrentErr(); 368 if (err != null) { 369 if (crlf) { 370 err.println(str); 371 } else { 372 err.print(str); 373 } 374 } 375 } 376 377 /** Current environment. */ 378 private final ScriptEnvironment env; 379 380 /** is this context in strict mode? Cached from env. as this is used heavily. */ 381 final boolean _strict; 382 383 /** class loader to resolve classes from script. */ 384 private final ClassLoader appLoader; 385 386 /** Class loader to load classes from -classpath option, if set. */ 387 private final ClassLoader classPathLoader; 388 389 /** Class loader to load classes compiled from scripts. */ 390 private final ScriptLoader scriptLoader; 391 392 /** Current error manager. */ 393 private final ErrorManager errors; 394 395 /** Unique id for script. Used only when --loader-per-compile=false */ 396 private final AtomicLong uniqueScriptId; 397 398 /** Optional class filter to use for Java classes. Can be null. */ 399 private final ClassFilter classFilter; 400 401 private static final ClassLoader myLoader = Context.class.getClassLoader(); 402 private static final StructureLoader sharedLoader; 403 404 /*package-private*/ @SuppressWarnings("static-method") 405 ClassLoader getSharedLoader() { 406 return sharedLoader; 407 } 408 409 private static AccessControlContext createNoPermAccCtxt() { 410 return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, new Permissions()) }); 411 } 412 413 private static AccessControlContext createPermAccCtxt(final String permName) { 414 final Permissions perms = new Permissions(); 415 perms.add(new RuntimePermission(permName)); 416 return new AccessControlContext(new ProtectionDomain[] { new ProtectionDomain(null, perms) }); 417 } 418 419 private static final AccessControlContext NO_PERMISSIONS_ACC_CTXT = createNoPermAccCtxt(); 420 private static final AccessControlContext CREATE_LOADER_ACC_CTXT = createPermAccCtxt("createClassLoader"); 421 private static final AccessControlContext CREATE_GLOBAL_ACC_CTXT = createPermAccCtxt(NASHORN_CREATE_GLOBAL); 422 423 static { 424 sharedLoader = AccessController.doPrivileged(new PrivilegedAction<StructureLoader>() { 425 @Override 426 public StructureLoader run() { 427 return new StructureLoader(myLoader); 428 } 429 }, CREATE_LOADER_ACC_CTXT); 430 } 431 432 /** 433 * ThrowErrorManager that throws ParserException upon error conditions. 434 */ 435 public static class ThrowErrorManager extends ErrorManager { 436 @Override 437 public void error(final String message) { 438 throw new ParserException(message); 439 } 440 441 @Override 442 public void error(final ParserException e) { 443 throw e; 444 } 445 } 446 447 /** 448 * Constructor 449 * 450 * @param options options from command line or Context creator 451 * @param errors error manger 452 * @param appLoader application class loader 453 */ 454 public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader) { 455 this(options, errors, appLoader, null); 456 } 457 458 /** 459 * Constructor 460 * 461 * @param options options from command line or Context creator 462 * @param errors error manger 463 * @param appLoader application class loader 464 * @param classFilter class filter to use 465 */ 466 public Context(final Options options, final ErrorManager errors, final ClassLoader appLoader, final ClassFilter classFilter) { 467 this(options, errors, new PrintWriter(System.out, true), new PrintWriter(System.err, true), appLoader, classFilter); 468 } 469 470 /** 471 * Constructor 472 * 473 * @param options options from command line or Context creator 474 * @param errors error manger 475 * @param out output writer for this Context 476 * @param err error writer for this Context 477 * @param appLoader application class loader 478 */ 479 public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader) { 480 this(options, errors, out, err, appLoader, (ClassFilter)null); 481 } 482 483 /** 484 * Constructor 485 * 486 * @param options options from command line or Context creator 487 * @param errors error manger 488 * @param out output writer for this Context 489 * @param err error writer for this Context 490 * @param appLoader application class loader 491 * @param classFilter class filter to use 492 */ 493 public Context(final Options options, final ErrorManager errors, final PrintWriter out, final PrintWriter err, final ClassLoader appLoader, final ClassFilter classFilter) { 494 final SecurityManager sm = System.getSecurityManager(); 495 if (sm != null) { 496 sm.checkPermission(new RuntimePermission(NASHORN_CREATE_CONTEXT)); 497 } 498 499 this.classFilter = classFilter; 500 this.env = new ScriptEnvironment(options, out, err); 501 this._strict = env._strict; 502 this.appLoader = appLoader; 503 if (env._loader_per_compile) { 504 this.scriptLoader = null; 505 this.uniqueScriptId = null; 506 } else { 507 this.scriptLoader = createNewLoader(); 508 this.uniqueScriptId = new AtomicLong(); 509 } 510 this.errors = errors; 511 512 // if user passed -classpath option, make a class loader with that and set it as 513 // thread context class loader so that script can access classes from that path. 514 final String classPath = options.getString("classpath"); 515 if (!env._compile_only && classPath != null && !classPath.isEmpty()) { 516 // make sure that caller can create a class loader. 517 if (sm != null) { 518 sm.checkPermission(new RuntimePermission("createClassLoader")); 519 } 520 this.classPathLoader = NashornLoader.createClassLoader(classPath); 521 } else { 522 this.classPathLoader = null; 523 } 524 525 final int cacheSize = env._class_cache_size; 526 if (cacheSize > 0) { 527 classCache = new ClassCache(this, cacheSize); 528 } 529 530 if (env._persistent_cache) { 531 codeStore = newCodeStore(this); 532 } 533 534 // print version info if asked. 535 if (env._version) { 536 getErr().println("nashorn " + Version.version()); 537 } 538 539 if (env._fullversion) { 540 getErr().println("nashorn full version " + Version.fullVersion()); 541 } 542 543 if (Options.getBooleanProperty("nashorn.fields.dual")) { 544 fieldMode = FieldMode.DUAL; 545 } else if (Options.getBooleanProperty("nashorn.fields.objects")) { 546 fieldMode = FieldMode.OBJECTS; 547 } else { 548 fieldMode = FieldMode.AUTO; 549 } 550 551 initLoggers(); 552 } 553 554 555 /** 556 * Get the class filter for this context 557 * @return class filter 558 */ 559 public ClassFilter getClassFilter() { 560 return classFilter; 561 } 562 563 /** 564 * Returns the factory for constant method handles for global properties. The returned factory can be 565 * invalidated if this Context has more than one Global. 566 * @return the factory for constant method handles for global properties. 567 */ 568 GlobalConstants getGlobalConstants() { 569 return globalConstantsRef.get(); 570 } 571 572 /** 573 * Get the error manager for this context 574 * @return error manger 575 */ 576 public ErrorManager getErrorManager() { 577 return errors; 578 } 579 580 /** 581 * Get the script environment for this context 582 * @return script environment 583 */ 584 public ScriptEnvironment getEnv() { 585 return env; 586 } 587 588 /** 589 * Get the output stream for this context 590 * @return output print writer 591 */ 592 public PrintWriter getOut() { 593 return env.getOut(); 594 } 595 596 /** 597 * Get the error stream for this context 598 * @return error print writer 599 */ 600 public PrintWriter getErr() { 601 return env.getErr(); 602 } 603 604 /** 605 * Should scripts compiled by this context use dual field representation? 606 * @return true if using dual fields, false for object-only fields 607 */ 608 public boolean useDualFields() { 609 return fieldMode == FieldMode.DUAL || (fieldMode == FieldMode.AUTO && env._optimistic_types); 610 } 611 612 /** 613 * Get the PropertyMap of the current global scope 614 * @return the property map of the current global scope 615 */ 616 public static PropertyMap getGlobalMap() { 617 return Context.getGlobal().getMap(); 618 } 619 620 /** 621 * Compile a top level script. 622 * 623 * @param source the source 624 * @param scope the scope 625 * 626 * @return top level function for script 627 */ 628 public ScriptFunction compileScript(final Source source, final ScriptObject scope) { 629 return compileScript(source, scope, this.errors); 630 } 631 632 /** 633 * Interface to represent compiled code that can be re-used across many 634 * global scope instances 635 */ 636 public static interface MultiGlobalCompiledScript { 637 /** 638 * Obtain script function object for a specific global scope object. 639 * 640 * @param newGlobal global scope for which function object is obtained 641 * @return script function for script level expressions 642 */ 643 public ScriptFunction getFunction(final Global newGlobal); 644 } 645 646 /** 647 * Compile a top level script. 648 * 649 * @param source the script source 650 * @return reusable compiled script across many global scopes. 651 */ 652 public MultiGlobalCompiledScript compileScript(final Source source) { 653 final Class<?> clazz = compile(source, this.errors, this._strict); 654 final MethodHandle createProgramFunctionHandle = getCreateProgramFunctionHandle(clazz); 655 656 return new MultiGlobalCompiledScript() { 657 @Override 658 public ScriptFunction getFunction(final Global newGlobal) { 659 return invokeCreateProgramFunctionHandle(createProgramFunctionHandle, newGlobal); 660 } 661 }; 662 } 663 664 /** 665 * Entry point for {@code eval} 666 * 667 * @param initialScope The scope of this eval call 668 * @param string Evaluated code as a String 669 * @param callThis "this" to be passed to the evaluated code 670 * @param location location of the eval call 671 * @return the return value of the {@code eval} 672 */ 673 public Object eval(final ScriptObject initialScope, final String string, 674 final Object callThis, final Object location) { 675 return eval(initialScope, string, callThis, location, false, false); 676 } 677 678 /** 679 * Entry point for {@code eval} 680 * 681 * @param initialScope The scope of this eval call 682 * @param string Evaluated code as a String 683 * @param callThis "this" to be passed to the evaluated code 684 * @param location location of the eval call 685 * @param strict is this {@code eval} call from a strict mode code? 686 * @param evalCall is this called from "eval" builtin? 687 * 688 * @return the return value of the {@code eval} 689 */ 690 public Object eval(final ScriptObject initialScope, final String string, 691 final Object callThis, final Object location, final boolean strict, final boolean evalCall) { 692 final String file = location == UNDEFINED || location == null ? "<eval>" : location.toString(); 693 final Source source = sourceFor(file, string, evalCall); 694 // is this direct 'eval' builtin call? 695 final boolean directEval = evalCall && (location != UNDEFINED); 696 final Global global = Context.getGlobal(); 697 ScriptObject scope = initialScope; 698 699 // ECMA section 10.1.1 point 2 says eval code is strict if it begins 700 // with "use strict" directive or eval direct call itself is made 701 // from from strict mode code. We are passed with caller's strict mode. 702 // Nashorn extension: any 'eval' is unconditionally strict when -strict is specified. 703 boolean strictFlag = strict || this._strict; 704 705 Class<?> clazz = null; 706 try { 707 clazz = compile(source, new ThrowErrorManager(), strictFlag); 708 } catch (final ParserException e) { 709 e.throwAsEcmaException(global); 710 return null; 711 } 712 713 if (!strictFlag) { 714 // We need to get strict mode flag from compiled class. This is 715 // because eval code may start with "use strict" directive. 716 try { 717 strictFlag = clazz.getField(STRICT_MODE.symbolName()).getBoolean(null); 718 } catch (final NoSuchFieldException | SecurityException | IllegalArgumentException | IllegalAccessException e) { 719 //ignored 720 strictFlag = false; 721 } 722 } 723 724 // In strict mode, eval does not instantiate variables and functions 725 // in the caller's environment. A new environment is created! 726 if (strictFlag) { 727 // Create a new scope object 728 final ScriptObject strictEvalScope = global.newObject(); 729 730 // bless it as a "scope" 731 strictEvalScope.setIsScope(); 732 733 // set given scope to be it's proto so that eval can still 734 // access caller environment vars in the new environment. 735 strictEvalScope.setProto(scope); 736 scope = strictEvalScope; 737 } 738 739 final ScriptFunction func = getProgramFunction(clazz, scope); 740 Object evalThis; 741 if (directEval) { 742 evalThis = (callThis != UNDEFINED && callThis != null) || strictFlag ? callThis : global; 743 } else { 744 // either indirect evalCall or non-eval (Function, engine.eval, ScriptObjectMirror.eval..) 745 evalThis = callThis; 746 } 747 748 return ScriptRuntime.apply(func, evalThis); 749 } 750 751 private static Source loadInternal(final String srcStr, final String prefix, final String resourcePath) { 752 if (srcStr.startsWith(prefix)) { 753 final String resource = resourcePath + srcStr.substring(prefix.length()); 754 // NOTE: even sandbox scripts should be able to load scripts in nashorn: scheme 755 // These scripts are always available and are loaded from nashorn.jar's resources. 756 return AccessController.doPrivileged( 757 new PrivilegedAction<Source>() { 758 @Override 759 public Source run() { 760 try { 761 final URL resURL = Context.class.getResource(resource); 762 return resURL != null ? sourceFor(srcStr, resURL) : null; 763 } catch (final IOException exp) { 764 return null; 765 } 766 } 767 }); 768 } 769 770 return null; 771 } 772 773 /** 774 * Implementation of {@code load} Nashorn extension. Load a script file from a source 775 * expression 776 * 777 * @param scope the scope 778 * @param from source expression for script 779 * 780 * @return return value for load call (undefined) 781 * 782 * @throws IOException if source cannot be found or loaded 783 */ 784 public Object load(final ScriptObject scope, final Object from) throws IOException { 785 final Object src = from instanceof ConsString ? from.toString() : from; 786 Source source = null; 787 788 // load accepts a String (which could be a URL or a file name), a File, a URL 789 // or a ScriptObject that has "name" and "source" (string valued) properties. 790 if (src instanceof String) { 791 final String srcStr = (String)src; 792 if (srcStr.startsWith(LOAD_CLASSPATH)) { 793 final URL url = getResourceURL(srcStr.substring(LOAD_CLASSPATH.length())); 794 source = url != null ? sourceFor(url.toString(), url) : null; 795 } else { 796 final File file = new File(srcStr); 797 if (srcStr.indexOf(':') != -1) { 798 if ((source = loadInternal(srcStr, LOAD_NASHORN, "resources/")) == null && 799 (source = loadInternal(srcStr, LOAD_FX, "resources/fx/")) == null) { 800 URL url; 801 try { 802 //check for malformed url. if malformed, it may still be a valid file 803 url = new URL(srcStr); 804 } catch (final MalformedURLException e) { 805 url = file.toURI().toURL(); 806 } 807 source = sourceFor(url.toString(), url); 808 } 809 } else if (file.isFile()) { 810 source = sourceFor(srcStr, file); 811 } 812 } 813 } else if (src instanceof File && ((File)src).isFile()) { 814 final File file = (File)src; 815 source = sourceFor(file.getName(), file); 816 } else if (src instanceof URL) { 817 final URL url = (URL)src; 818 source = sourceFor(url.toString(), url); 819 } else if (src instanceof ScriptObject) { 820 final ScriptObject sobj = (ScriptObject)src; 821 if (sobj.has("script") && sobj.has("name")) { 822 final String script = JSType.toString(sobj.get("script")); 823 final String name = JSType.toString(sobj.get("name")); 824 source = sourceFor(name, script); 825 } 826 } else if (src instanceof Map) { 827 final Map<?,?> map = (Map<?,?>)src; 828 if (map.containsKey("script") && map.containsKey("name")) { 829 final String script = JSType.toString(map.get("script")); 830 final String name = JSType.toString(map.get("name")); 831 source = sourceFor(name, script); 832 } 833 } 834 835 if (source != null) { 836 return evaluateSource(source, scope, scope); 837 } 838 839 throw typeError("cant.load.script", ScriptRuntime.safeToString(from)); 840 } 841 842 /** 843 * Implementation of {@code loadWithNewGlobal} Nashorn extension. Load a script file from a source 844 * expression, after creating a new global scope. 845 * 846 * @param from source expression for script 847 * @param args (optional) arguments to be passed to the loaded script 848 * 849 * @return return value for load call (undefined) 850 * 851 * @throws IOException if source cannot be found or loaded 852 */ 853 public Object loadWithNewGlobal(final Object from, final Object...args) throws IOException { 854 final Global oldGlobal = getGlobal(); 855 final Global newGlobal = AccessController.doPrivileged(new PrivilegedAction<Global>() { 856 @Override 857 public Global run() { 858 try { 859 return newGlobal(); 860 } catch (final RuntimeException e) { 861 if (Context.DEBUG) { 862 e.printStackTrace(); 863 } 864 throw e; 865 } 866 } 867 }, CREATE_GLOBAL_ACC_CTXT); 868 // initialize newly created Global instance 869 initGlobal(newGlobal); 870 setGlobal(newGlobal); 871 872 final Object[] wrapped = args == null? ScriptRuntime.EMPTY_ARRAY : ScriptObjectMirror.wrapArray(args, oldGlobal); 873 newGlobal.put("arguments", newGlobal.wrapAsObject(wrapped), env._strict); 874 875 try { 876 // wrap objects from newGlobal's world as mirrors - but if result 877 // is from oldGlobal's world, unwrap it! 878 return ScriptObjectMirror.unwrap(ScriptObjectMirror.wrap(load(newGlobal, from), newGlobal), oldGlobal); 879 } finally { 880 setGlobal(oldGlobal); 881 } 882 } 883 884 /** 885 * Load or get a structure class. Structure class names are based on the number of parameter fields 886 * and {@link AccessorProperty} fields in them. Structure classes are used to represent ScriptObjects 887 * 888 * @see ObjectClassGenerator 889 * @see AccessorProperty 890 * @see ScriptObject 891 * 892 * @param fullName full name of class, e.g. jdk.nashorn.internal.objects.JO2P1 contains 2 fields and 1 parameter. 893 * 894 * @return the {@code Class<?>} for this structure 895 * 896 * @throws ClassNotFoundException if structure class cannot be resolved 897 */ 898 @SuppressWarnings("unchecked") 899 public static Class<? extends ScriptObject> forStructureClass(final String fullName) throws ClassNotFoundException { 900 if (System.getSecurityManager() != null && !StructureLoader.isStructureClass(fullName)) { 901 throw new ClassNotFoundException(fullName); 902 } 903 return (Class<? extends ScriptObject>)Class.forName(fullName, true, sharedLoader); 904 } 905 906 /** 907 * Checks that the given Class can be accessed from no permissions context. 908 * 909 * @param clazz Class object 910 * @throws SecurityException if not accessible 911 */ 912 public static void checkPackageAccess(final Class<?> clazz) { 913 final SecurityManager sm = System.getSecurityManager(); 914 if (sm != null) { 915 Class<?> bottomClazz = clazz; 916 while (bottomClazz.isArray()) { 917 bottomClazz = bottomClazz.getComponentType(); 918 } 919 checkPackageAccess(sm, bottomClazz.getName()); 920 } 921 } 922 923 /** 924 * Checks that the given package name can be accessed from no permissions context. 925 * 926 * @param pkgName package name 927 * @throws SecurityException if not accessible 928 */ 929 public static void checkPackageAccess(final String pkgName) { 930 final SecurityManager sm = System.getSecurityManager(); 931 if (sm != null) { 932 checkPackageAccess(sm, pkgName.endsWith(".") ? pkgName : pkgName + "."); 933 } 934 } 935 936 /** 937 * Checks that the given package can be accessed from no permissions context. 938 * 939 * @param sm current security manager instance 940 * @param fullName fully qualified package name 941 * @throw SecurityException if not accessible 942 */ 943 private static void checkPackageAccess(final SecurityManager sm, final String fullName) { 944 Objects.requireNonNull(sm); 945 final int index = fullName.lastIndexOf('.'); 946 if (index != -1) { 947 final String pkgName = fullName.substring(0, index); 948 AccessController.doPrivileged(new PrivilegedAction<Void>() { 949 @Override 950 public Void run() { 951 sm.checkPackageAccess(pkgName); 952 return null; 953 } 954 }, NO_PERMISSIONS_ACC_CTXT); 955 } 956 } 957 958 /** 959 * Checks that the given Class can be accessed from no permissions context. 960 * 961 * @param clazz Class object 962 * @return true if package is accessible, false otherwise 963 */ 964 private static boolean isAccessiblePackage(final Class<?> clazz) { 965 try { 966 checkPackageAccess(clazz); 967 return true; 968 } catch (final SecurityException se) { 969 return false; 970 } 971 } 972 973 /** 974 * Checks that the given Class is public and it can be accessed from no permissions context. 975 * 976 * @param clazz Class object to check 977 * @return true if Class is accessible, false otherwise 978 */ 979 public static boolean isAccessibleClass(final Class<?> clazz) { 980 return Modifier.isPublic(clazz.getModifiers()) && Context.isAccessiblePackage(clazz); 981 } 982 983 /** 984 * Lookup a Java class. This is used for JSR-223 stuff linking in from 985 * {@code jdk.nashorn.internal.objects.NativeJava} and {@code jdk.nashorn.internal.runtime.NativeJavaPackage} 986 * 987 * @param fullName full name of class to load 988 * 989 * @return the {@code Class<?>} for the name 990 * 991 * @throws ClassNotFoundException if class cannot be resolved 992 */ 993 public Class<?> findClass(final String fullName) throws ClassNotFoundException { 994 if (fullName.indexOf('[') != -1 || fullName.indexOf('/') != -1) { 995 // don't allow array class names or internal names. 996 throw new ClassNotFoundException(fullName); 997 } 998 999 // give chance to ClassFilter to filter out, if present 1000 if (classFilter != null && !classFilter.exposeToScripts(fullName)) { 1001 throw new ClassNotFoundException(fullName); 1002 } 1003 1004 // check package access as soon as possible! 1005 final SecurityManager sm = System.getSecurityManager(); 1006 if (sm != null) { 1007 checkPackageAccess(sm, fullName); 1008 } 1009 1010 // try the script -classpath loader, if that is set 1011 if (classPathLoader != null) { 1012 try { 1013 return Class.forName(fullName, true, classPathLoader); 1014 } catch (final ClassNotFoundException ignored) { 1015 // ignore, continue search 1016 } 1017 } 1018 1019 // Try finding using the "app" loader. 1020 return Class.forName(fullName, true, appLoader); 1021 } 1022 1023 /** 1024 * Hook to print stack trace for a {@link Throwable} that occurred during 1025 * execution 1026 * 1027 * @param t throwable for which to dump stack 1028 */ 1029 public static void printStackTrace(final Throwable t) { 1030 if (Context.DEBUG) { 1031 t.printStackTrace(Context.getCurrentErr()); 1032 } 1033 } 1034 1035 /** 1036 * Verify generated bytecode before emission. This is called back from the 1037 * {@link ObjectClassGenerator} or the {@link Compiler}. If the "--verify-code" parameter 1038 * hasn't been given, this is a nop 1039 * 1040 * Note that verification may load classes -- we don't want to do that unless 1041 * user specified verify option. We check it here even though caller 1042 * may have already checked that flag 1043 * 1044 * @param bytecode bytecode to verify 1045 */ 1046 public void verify(final byte[] bytecode) { 1047 if (env._verify_code) { 1048 // No verification when security manager is around as verifier 1049 // may load further classes - which should be avoided. 1050 if (System.getSecurityManager() == null) { 1051 CheckClassAdapter.verify(new ClassReader(bytecode), sharedLoader, false, new PrintWriter(System.err, true)); 1052 } 1053 } 1054 } 1055 1056 /** 1057 * Create and initialize a new global scope object. 1058 * 1059 * @return the initialized global scope object. 1060 */ 1061 public Global createGlobal() { 1062 return initGlobal(newGlobal()); 1063 } 1064 1065 /** 1066 * Create a new uninitialized global scope object 1067 * @return the global script object 1068 */ 1069 public Global newGlobal() { 1070 createOrInvalidateGlobalConstants(); 1071 return new Global(this); 1072 } 1073 1074 private void createOrInvalidateGlobalConstants() { 1075 for (;;) { 1076 final GlobalConstants currentGlobalConstants = getGlobalConstants(); 1077 if (currentGlobalConstants != null) { 1078 // Subsequent invocation; we're creating our second or later Global. GlobalConstants is not safe to use 1079 // with more than one Global, as the constant method handle linkages it creates create a coupling 1080 // between the Global and the call sites in the compiled code. 1081 currentGlobalConstants.invalidateForever(); 1082 return; 1083 } 1084 final GlobalConstants newGlobalConstants = new GlobalConstants(getLogger(GlobalConstants.class)); 1085 if (globalConstantsRef.compareAndSet(null, newGlobalConstants)) { 1086 // First invocation; we're creating the first Global in this Context. Create the GlobalConstants object 1087 // for this Context. 1088 return; 1089 } 1090 1091 // If we reach here, then we started out as the first invocation, but another concurrent invocation won the 1092 // CAS race. We'll just let the loop repeat and invalidate the CAS race winner. 1093 } 1094 } 1095 1096 /** 1097 * Initialize given global scope object. 1098 * 1099 * @param global the global 1100 * @param engine the associated ScriptEngine instance, can be null 1101 * @param ctxt the initial ScriptContext, can be null 1102 * @return the initialized global scope object. 1103 */ 1104 public Global initGlobal(final Global global, final ScriptEngine engine, final ScriptContext ctxt) { 1105 // Need only minimal global object, if we are just compiling. 1106 if (!env._compile_only) { 1107 final Global oldGlobal = Context.getGlobal(); 1108 try { 1109 Context.setGlobal(global); 1110 // initialize global scope with builtin global objects 1111 global.initBuiltinObjects(engine, ctxt); 1112 } finally { 1113 Context.setGlobal(oldGlobal); 1114 } 1115 } 1116 1117 return global; 1118 } 1119 1120 /** 1121 * Initialize given global scope object. 1122 * 1123 * @param global the global 1124 * @return the initialized global scope object. 1125 */ 1126 public Global initGlobal(final Global global) { 1127 return initGlobal(global, null, null); 1128 } 1129 1130 /** 1131 * Return the current global's context 1132 * @return current global's context 1133 */ 1134 static Context getContextTrusted() { 1135 return getContext(getGlobal()); 1136 } 1137 1138 static Context getContextTrustedOrNull() { 1139 final Global global = Context.getGlobal(); 1140 return global == null ? null : getContext(global); 1141 } 1142 1143 private static Context getContext(final Global global) { 1144 // We can't invoke Global.getContext() directly, as it's a protected override, and Global isn't in our package. 1145 // In order to access the method, we must cast it to ScriptObject first (which is in our package) and then let 1146 // virtual invocation do its thing. 1147 return ((ScriptObject)global).getContext(); 1148 } 1149 1150 /** 1151 * Try to infer Context instance from the Class. If we cannot, 1152 * then get it from the thread local variable. 1153 * 1154 * @param clazz the class 1155 * @return context 1156 */ 1157 static Context fromClass(final Class<?> clazz) { 1158 final ClassLoader loader = clazz.getClassLoader(); 1159 1160 if (loader instanceof ScriptLoader) { 1161 return ((ScriptLoader)loader).getContext(); 1162 } 1163 1164 return Context.getContextTrusted(); 1165 } 1166 1167 private URL getResourceURL(final String resName) { 1168 // try the classPathLoader if we have and then 1169 // try the appLoader if non-null. 1170 if (classPathLoader != null) { 1171 return classPathLoader.getResource(resName); 1172 } else if (appLoader != null) { 1173 return appLoader.getResource(resName); 1174 } 1175 1176 return null; 1177 } 1178 1179 private Object evaluateSource(final Source source, final ScriptObject scope, final ScriptObject thiz) { 1180 ScriptFunction script = null; 1181 1182 try { 1183 script = compileScript(source, scope, new Context.ThrowErrorManager()); 1184 } catch (final ParserException e) { 1185 e.throwAsEcmaException(); 1186 } 1187 1188 return ScriptRuntime.apply(script, thiz); 1189 } 1190 1191 private static ScriptFunction getProgramFunction(final Class<?> script, final ScriptObject scope) { 1192 if (script == null) { 1193 return null; 1194 } 1195 return invokeCreateProgramFunctionHandle(getCreateProgramFunctionHandle(script), scope); 1196 } 1197 1198 private static MethodHandle getCreateProgramFunctionHandle(final Class<?> script) { 1199 try { 1200 return LOOKUP.findStatic(script, CREATE_PROGRAM_FUNCTION.symbolName(), CREATE_PROGRAM_FUNCTION_TYPE); 1201 } catch (NoSuchMethodException | IllegalAccessException e) { 1202 throw new AssertionError("Failed to retrieve a handle for the program function for " + script.getName(), e); 1203 } 1204 } 1205 1206 private static ScriptFunction invokeCreateProgramFunctionHandle(final MethodHandle createProgramFunctionHandle, final ScriptObject scope) { 1207 try { 1208 return (ScriptFunction)createProgramFunctionHandle.invokeExact(scope); 1209 } catch (final RuntimeException|Error e) { 1210 throw e; 1211 } catch (final Throwable t) { 1212 throw new AssertionError("Failed to create a program function", t); 1213 } 1214 } 1215 1216 private ScriptFunction compileScript(final Source source, final ScriptObject scope, final ErrorManager errMan) { 1217 return getProgramFunction(compile(source, errMan, this._strict), scope); 1218 } 1219 1220 private synchronized Class<?> compile(final Source source, final ErrorManager errMan, final boolean strict) { 1221 // start with no errors, no warnings. 1222 errMan.reset(); 1223 1224 Class<?> script = findCachedClass(source); 1225 if (script != null) { 1226 final DebugLogger log = getLogger(Compiler.class); 1227 if (log.isEnabled()) { 1228 log.fine(new RuntimeEvent<>(Level.INFO, source), "Code cache hit for ", source, " avoiding recompile."); 1229 } 1230 return script; 1231 } 1232 1233 StoredScript storedScript = null; 1234 FunctionNode functionNode = null; 1235 // Don't use code store if optimistic types is enabled but lazy compilation is not. 1236 // This would store a full script compilation with many wrong optimistic assumptions that would 1237 // do more harm than good on later runs with both optimistic types and lazy compilation enabled. 1238 final boolean useCodeStore = codeStore != null && !env._parse_only && (!env._optimistic_types || env._lazy_compilation); 1239 final String cacheKey = useCodeStore ? CodeStore.getCacheKey("script", null) : null; 1240 1241 if (useCodeStore) { 1242 storedScript = codeStore.load(source, cacheKey); 1243 } 1244 1245 if (storedScript == null) { 1246 if (env._dest_dir != null) { 1247 source.dump(env._dest_dir); 1248 } 1249 1250 functionNode = new Parser(env, source, errMan, strict, getLogger(Parser.class)).parse(); 1251 1252 if (errMan.hasErrors()) { 1253 return null; 1254 } 1255 1256 if (env._print_ast || functionNode.getFlag(FunctionNode.IS_PRINT_AST)) { 1257 getErr().println(new ASTWriter(functionNode)); 1258 } 1259 1260 if (env._print_parse || functionNode.getFlag(FunctionNode.IS_PRINT_PARSE)) { 1261 getErr().println(new PrintVisitor(functionNode, true, false)); 1262 } 1263 } 1264 1265 if (env._parse_only) { 1266 return null; 1267 } 1268 1269 final URL url = source.getURL(); 1270 final ScriptLoader loader = env._loader_per_compile ? createNewLoader() : scriptLoader; 1271 final CodeSource cs = new CodeSource(url, (CodeSigner[])null); 1272 final CodeInstaller<ScriptEnvironment> installer = new ContextCodeInstaller(this, loader, cs); 1273 1274 if (storedScript == null) { 1275 final CompilationPhases phases = Compiler.CompilationPhases.COMPILE_ALL; 1276 1277 final Compiler compiler = new Compiler( 1278 this, 1279 env, 1280 installer, 1281 source, 1282 errMan, 1283 strict | functionNode.isStrict()); 1284 1285 final FunctionNode compiledFunction = compiler.compile(functionNode, phases); 1286 if (errMan.hasErrors()) { 1287 return null; 1288 } 1289 script = compiledFunction.getRootClass(); 1290 compiler.persistClassInfo(cacheKey, compiledFunction); 1291 } else { 1292 Compiler.updateCompilationId(storedScript.getCompilationId()); 1293 script = storedScript.installScript(source, installer); 1294 } 1295 1296 cacheClass(source, script); 1297 return script; 1298 } 1299 1300 private ScriptLoader createNewLoader() { 1301 return AccessController.doPrivileged( 1302 new PrivilegedAction<ScriptLoader>() { 1303 @Override 1304 public ScriptLoader run() { 1305 return new ScriptLoader(appLoader, Context.this); 1306 } 1307 }, CREATE_LOADER_ACC_CTXT); 1308 } 1309 1310 private long getUniqueScriptId() { 1311 return uniqueScriptId.getAndIncrement(); 1312 } 1313 1314 /** 1315 * Cache for compiled script classes. 1316 */ 1317 @SuppressWarnings("serial") 1318 @Logger(name="classcache") 1319 private static class ClassCache extends LinkedHashMap<Source, ClassReference> implements Loggable { 1320 private final int size; 1321 private final ReferenceQueue<Class<?>> queue; 1322 private final DebugLogger log; 1323 1324 ClassCache(final Context context, final int size) { 1325 super(size, 0.75f, true); 1326 this.size = size; 1327 this.queue = new ReferenceQueue<>(); 1328 this.log = initLogger(context); 1329 } 1330 1331 void cache(final Source source, final Class<?> clazz) { 1332 if (log.isEnabled()) { 1333 log.info("Caching ", source, " in class cache"); 1334 } 1335 put(source, new ClassReference(clazz, queue, source)); 1336 } 1337 1338 @Override 1339 protected boolean removeEldestEntry(final Map.Entry<Source, ClassReference> eldest) { 1340 return size() > size; 1341 } 1342 1343 @Override 1344 public ClassReference get(final Object key) { 1345 for (ClassReference ref; (ref = (ClassReference)queue.poll()) != null; ) { 1346 final Source source = ref.source; 1347 if (log.isEnabled()) { 1348 log.info("Evicting ", source, " from class cache."); 1349 } 1350 remove(source); 1351 } 1352 1353 final ClassReference ref = super.get(key); 1354 if (ref != null && log.isEnabled()) { 1355 log.info("Retrieved class reference for ", ref.source, " from class cache"); 1356 } 1357 return ref; 1358 } 1359 1360 @Override 1361 public DebugLogger initLogger(final Context context) { 1362 return context.getLogger(getClass()); 1363 } 1364 1365 @Override 1366 public DebugLogger getLogger() { 1367 return log; 1368 } 1369 1370 } 1371 1372 private static class ClassReference extends SoftReference<Class<?>> { 1373 private final Source source; 1374 1375 ClassReference(final Class<?> clazz, final ReferenceQueue<Class<?>> queue, final Source source) { 1376 super(clazz, queue); 1377 this.source = source; 1378 } 1379 } 1380 1381 // Class cache management 1382 private Class<?> findCachedClass(final Source source) { 1383 final ClassReference ref = classCache == null ? null : classCache.get(source); 1384 return ref != null ? ref.get() : null; 1385 } 1386 1387 private void cacheClass(final Source source, final Class<?> clazz) { 1388 if (classCache != null) { 1389 classCache.cache(source, clazz); 1390 } 1391 } 1392 1393 // logging 1394 private final Map<String, DebugLogger> loggers = new HashMap<>(); 1395 1396 private void initLoggers() { 1397 ((Loggable)MethodHandleFactory.getFunctionality()).initLogger(this); 1398 } 1399 1400 /** 1401 * Get a logger, given a loggable class 1402 * @param clazz a Loggable class 1403 * @return debuglogger associated with that class 1404 */ 1405 public DebugLogger getLogger(final Class<? extends Loggable> clazz) { 1406 return getLogger(clazz, null); 1407 } 1408 1409 /** 1410 * Get a logger, given a loggable class 1411 * @param clazz a Loggable class 1412 * @param initHook an init hook - if this is the first time the logger is created in the context, run the init hook 1413 * @return debuglogger associated with that class 1414 */ 1415 public DebugLogger getLogger(final Class<? extends Loggable> clazz, final Consumer<DebugLogger> initHook) { 1416 final String name = getLoggerName(clazz); 1417 DebugLogger logger = loggers.get(name); 1418 if (logger == null) { 1419 if (!env.hasLogger(name)) { 1420 return DebugLogger.DISABLED_LOGGER; 1421 } 1422 final LoggerInfo info = env._loggers.get(name); 1423 logger = new DebugLogger(name, info.getLevel(), info.isQuiet()); 1424 if (initHook != null) { 1425 initHook.accept(logger); 1426 } 1427 loggers.put(name, logger); 1428 } 1429 return logger; 1430 } 1431 1432 /** 1433 * Given a Loggable class, weave debug info info a method handle for that logger. 1434 * Level.INFO is used 1435 * 1436 * @param clazz loggable 1437 * @param mh method handle 1438 * @param text debug printout to add 1439 * 1440 * @return instrumented method handle, or null if logger not enabled 1441 */ 1442 public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final MethodHandle mh, final Supplier<String> text) { 1443 return addLoggingToHandle(clazz, Level.INFO, mh, Integer.MAX_VALUE, false, text); 1444 } 1445 1446 /** 1447 * Given a Loggable class, weave debug info info a method handle for that logger. 1448 * 1449 * @param clazz loggable 1450 * @param level log level 1451 * @param mh method handle 1452 * @param paramStart first parameter to print 1453 * @param printReturnValue should we print the return vaulue? 1454 * @param text debug printout to add 1455 * 1456 * @return instrumented method handle, or null if logger not enabled 1457 */ 1458 public MethodHandle addLoggingToHandle(final Class<? extends Loggable> clazz, final Level level, final MethodHandle mh, final int paramStart, final boolean printReturnValue, final Supplier<String> text) { 1459 final DebugLogger log = getLogger(clazz); 1460 if (log.isEnabled()) { 1461 return MethodHandleFactory.addDebugPrintout(log, level, mh, paramStart, printReturnValue, text.get()); 1462 } 1463 return mh; 1464 } 1465 1466 private static String getLoggerName(final Class<?> clazz) { 1467 Class<?> current = clazz; 1468 while (current != null) { 1469 final Logger log = current.getAnnotation(Logger.class); 1470 if (log != null) { 1471 assert !"".equals(log.name()); 1472 return log.name(); 1473 } 1474 current = current.getSuperclass(); 1475 } 1476 assert false; 1477 return null; 1478 } 1479 1480 /** 1481 * This is a special kind of switchpoint used to guard builtin 1482 * properties and prototypes. In the future it might contain 1483 * logic to e.g. multiple switchpoint classes. 1484 */ 1485 public static final class BuiltinSwitchPoint extends SwitchPoint { 1486 //empty 1487 } 1488 1489 /** 1490 * Create a new builtin switchpoint and return it 1491 * @param name key name 1492 * @return new builtin switchpoint 1493 */ 1494 public SwitchPoint newBuiltinSwitchPoint(final String name) { 1495 assert builtinSwitchPoints.get(name) == null; 1496 final SwitchPoint sp = new BuiltinSwitchPoint(); 1497 builtinSwitchPoints.put(name, sp); 1498 return sp; 1499 } 1500 1501 /** 1502 * Return the builtin switchpoint for a particular key name 1503 * @param name key name 1504 * @return builtin switchpoint or null if none 1505 */ 1506 public SwitchPoint getBuiltinSwitchPoint(final String name) { 1507 return builtinSwitchPoints.get(name); 1508 } 1509 1510} 1511