1 /* 2 * Copyright (c) 2009, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.javac.file; 27 28 import java.io.IOException; 29 import java.io.InputStream; 30 import java.lang.ref.SoftReference; 31 import java.lang.reflect.Constructor; 32 import java.lang.reflect.Method; 33 import java.net.URL; 34 import java.net.URLClassLoader; 35 import java.nio.ByteBuffer; 36 import java.nio.CharBuffer; 37 import java.nio.charset.Charset; 38 import java.nio.charset.CharsetDecoder; 39 import java.nio.charset.CoderResult; 40 import java.nio.charset.CodingErrorAction; 41 import java.nio.charset.IllegalCharsetNameException; 42 import java.nio.charset.UnsupportedCharsetException; 43 import java.nio.file.Path; 44 import java.util.Collection; 45 import java.util.HashMap; 46 import java.util.Iterator; 47 import java.util.Map; 48 import java.util.Objects; 49 import java.util.Set; 50 51 import javax.tools.JavaFileManager; 52 import javax.tools.JavaFileObject; 53 import javax.tools.JavaFileObject.Kind; 54 55 import com.sun.tools.javac.code.Lint; 56 import com.sun.tools.javac.code.Source; 57 import com.sun.tools.javac.main.Option; 58 import com.sun.tools.javac.main.OptionHelper; 59 import com.sun.tools.javac.main.OptionHelper.GrumpyHelper; 60 import com.sun.tools.javac.resources.CompilerProperties.Errors; 61 import com.sun.tools.javac.util.Abort; 62 import com.sun.tools.javac.util.Context; 63 import com.sun.tools.javac.util.DefinedBy; 64 import com.sun.tools.javac.util.DefinedBy.Api; 65 import com.sun.tools.javac.util.Log; 66 import com.sun.tools.javac.util.Options; 67 68 /** 69 * Utility methods for building a filemanager. 70 * There are no references here to file-system specific objects such as 71 * java.io.File or java.nio.file.Path. 72 */ 73 public abstract class BaseFileManager implements JavaFileManager { 74 protected BaseFileManager(Charset charset) { 75 this.charset = charset; 76 byteBufferCache = new ByteBufferCache(); 77 locations = createLocations(); 78 } 79 80 /** 81 * Set the context for JavacPathFileManager. 82 * @param context the context containing items to be associated with the file manager 83 */ 84 public void setContext(Context context) { 85 log = Log.instance(context); 86 options = Options.instance(context); 87 classLoaderClass = options.get("procloader"); 88 locations.update(log, Lint.instance(context), FSInfo.instance(context)); 89 90 // Setting this option is an indication that close() should defer actually closing 91 // the file manager until after a specified period of inactivity. 92 // This is to accomodate clients which save references to Symbols created for use 93 // within doclets or annotation processors, and which then attempt to use those 94 // references after the tool exits, having closed any internally managed file manager. 95 // Ideally, such clients should run the tool via the javax.tools API, providing their 96 // own file manager, which can be closed by the client when all use of that file 97 // manager is complete. 98 // If the option has a numeric value, it will be interpreted as the duration, 99 // in seconds, of the period of inactivity to wait for, before the file manager 100 // is actually closed. 101 // See also deferredClose(). 102 String s = options.get("fileManager.deferClose"); 103 if (s != null) { 104 try { 105 deferredCloseTimeout = (int) (Float.parseFloat(s) * 1000); 106 } catch (NumberFormatException e) { 107 deferredCloseTimeout = 60 * 1000; // default: one minute, in millis 108 } 109 } 110 } 111 112 protected Locations createLocations() { 113 return new Locations(); 114 } 115 116 /** 117 * The log to be used for error reporting. 118 */ 119 public Log log; 120 121 /** 122 * User provided charset (through javax.tools). 123 */ 124 protected Charset charset; 125 126 protected Options options; 127 128 protected String classLoaderClass; 129 130 protected Locations locations; 131 132 /** 133 * A flag for clients to use to indicate that this file manager should 134 * be closed when it is no longer required. 135 */ 136 public boolean autoClose; 137 138 /** 139 * Wait for a period of inactivity before calling close(). 140 * The length of the period of inactivity is given by {@code deferredCloseTimeout} 141 */ 142 protected void deferredClose() { 143 Thread t = new Thread(getClass().getName() + " DeferredClose") { 144 @Override 145 public void run() { 146 try { 147 synchronized (BaseFileManager.this) { 148 long now = System.currentTimeMillis(); 149 while (now < lastUsedTime + deferredCloseTimeout) { 150 BaseFileManager.this.wait(lastUsedTime + deferredCloseTimeout - now); 151 now = System.currentTimeMillis(); 152 } 153 deferredCloseTimeout = 0; 154 close(); 155 } 156 } catch (InterruptedException e) { 157 } catch (IOException e) { 158 } 159 } 160 }; 161 t.setDaemon(true); 162 t.start(); 163 } 164 165 synchronized void updateLastUsedTime() { 166 if (deferredCloseTimeout > 0) { // avoid updating the time unnecessarily 167 lastUsedTime = System.currentTimeMillis(); 168 } 169 } 170 171 private long lastUsedTime = System.currentTimeMillis(); 172 protected long deferredCloseTimeout = 0; 173 174 protected Source getSource() { 175 String sourceName = options.get(Option.SOURCE); 176 Source source = null; 177 if (sourceName != null) 178 source = Source.lookup(sourceName); 179 return (source != null ? source : Source.DEFAULT); 180 } 181 182 protected ClassLoader getClassLoader(URL[] urls) { 183 ClassLoader thisClassLoader = getClass().getClassLoader(); 184 185 // Allow the following to specify a closeable classloader 186 // other than URLClassLoader. 187 188 // 1: Allow client to specify the class to use via hidden option 189 if (classLoaderClass != null) { 190 try { 191 Class<? extends ClassLoader> loader = 192 Class.forName(classLoaderClass).asSubclass(ClassLoader.class); 193 Class<?>[] constrArgTypes = { URL[].class, ClassLoader.class }; 194 Constructor<? extends ClassLoader> constr = loader.getConstructor(constrArgTypes); 195 return ensureReadable(constr.newInstance(urls, thisClassLoader)); 196 } catch (ReflectiveOperationException t) { 197 // ignore errors loading user-provided class loader, fall through 198 } 199 } 200 return ensureReadable(new URLClassLoader(urls, thisClassLoader)); 201 } 202 203 /** 204 * Ensures that the unnamed module of the given classloader is readable to this 205 * module. 206 */ 207 private ClassLoader ensureReadable(ClassLoader targetLoader) { 208 try { 209 Method getModuleMethod = Class.class.getMethod("getModule"); 210 Object thisModule = getModuleMethod.invoke(this.getClass()); 211 Method getUnnamedModuleMethod = ClassLoader.class.getMethod("getUnnamedModule"); 212 Object targetModule = getUnnamedModuleMethod.invoke(targetLoader); 213 214 Class<?> moduleClass = getModuleMethod.getReturnType(); 215 Method addReadsMethod = moduleClass.getMethod("addReads", moduleClass); 216 addReadsMethod.invoke(thisModule, targetModule); 217 } catch (NoSuchMethodException e) { 218 // ignore 219 } catch (Exception e) { 220 throw new Abort(e); 221 } 222 return targetLoader; 223 } 224 225 public boolean isDefaultBootClassPath() { 226 return locations.isDefaultBootClassPath(); 227 } 228 229 // <editor-fold defaultstate="collapsed" desc="Option handling"> 230 @Override @DefinedBy(Api.COMPILER) 231 public boolean handleOption(String current, Iterator<String> remaining) { 232 OptionHelper helper = new GrumpyHelper(log) { 233 @Override 234 public String get(Option option) { 235 return options.get(option.getText()); 236 } 237 238 @Override 239 public void put(String name, String value) { 240 options.put(name, value); 241 } 242 243 @Override 244 public void remove(String name) { 245 options.remove(name); 246 } 247 248 @Override 249 public boolean handleFileManagerOption(Option option, String value) { 250 return handleOption(option, value); 251 } 252 }; 253 254 for (Option o: javacFileManagerOptions) { 255 if (o.matches(current)) { 256 if (o.hasArg()) { 257 if (remaining.hasNext()) { 258 if (!o.process(helper, current, remaining.next())) 259 return true; 260 } 261 } else { 262 if (!o.process(helper, current)) 263 return true; 264 } 265 // operand missing, or process returned true 266 throw new IllegalArgumentException(current); 267 } 268 } 269 270 return false; 271 } 272 // where 273 private static final Set<Option> javacFileManagerOptions = 274 Option.getJavacFileManagerOptions(); 275 276 @Override @DefinedBy(Api.COMPILER) 277 public int isSupportedOption(String option) { 278 for (Option o : javacFileManagerOptions) { 279 if (o.matches(option)) 280 return o.hasArg() ? 1 : 0; 281 } 282 return -1; 283 } 284 285 protected String multiReleaseValue; 286 287 /** 288 * Common back end for OptionHelper handleFileManagerOption. 289 * @param option the option whose value to be set 290 * @param value the value for the option 291 * @return true if successful, and false otherwise 292 */ 293 public boolean handleOption(Option option, String value) { 294 switch (option) { 295 case ENCODING: 296 encodingName = value; 297 return true; 298 299 case MULTIRELEASE: 300 multiReleaseValue = value; 301 return true; 302 303 default: 304 return locations.handleOption(option, value); 305 } 306 } 307 308 /** 309 * Call handleOption for collection of options and corresponding values. 310 * @param map a collection of options and corresponding values 311 * @return true if all the calls are successful 312 */ 313 public boolean handleOptions(Map<Option, String> map) { 314 boolean ok = true; 315 for (Map.Entry<Option, String> e: map.entrySet()) { 316 try { 317 ok = ok & handleOption(e.getKey(), e.getValue()); 318 } catch (IllegalArgumentException ex) { 319 log.error(Errors.IllegalArgumentForOption(e.getKey().getText(), ex.getMessage())); 320 ok = false; 321 } 322 } 323 return ok; 324 } 325 326 // </editor-fold> 327 328 // <editor-fold defaultstate="collapsed" desc="Encoding"> 329 private String encodingName; 330 private String defaultEncodingName; 331 private String getDefaultEncodingName() { 332 if (defaultEncodingName == null) { 333 defaultEncodingName = Charset.defaultCharset().name(); 334 } 335 return defaultEncodingName; 336 } 337 338 public String getEncodingName() { 339 return (encodingName != null) ? encodingName : getDefaultEncodingName(); 340 } 341 342 @SuppressWarnings("cast") 343 public CharBuffer decode(ByteBuffer inbuf, boolean ignoreEncodingErrors) { 344 String encodingName = getEncodingName(); 345 CharsetDecoder decoder; 346 try { 347 decoder = getDecoder(encodingName, ignoreEncodingErrors); 348 } catch (IllegalCharsetNameException | UnsupportedCharsetException e) { 349 log.error("unsupported.encoding", encodingName); 350 return (CharBuffer)CharBuffer.allocate(1).flip(); 351 } 352 353 // slightly overestimate the buffer size to avoid reallocation. 354 float factor = 355 decoder.averageCharsPerByte() * 0.8f + 356 decoder.maxCharsPerByte() * 0.2f; 357 CharBuffer dest = CharBuffer. 358 allocate(10 + (int)(inbuf.remaining()*factor)); 359 360 while (true) { 361 CoderResult result = decoder.decode(inbuf, dest, true); 362 dest.flip(); 363 364 if (result.isUnderflow()) { // done reading 365 // make sure there is at least one extra character 366 if (dest.limit() == dest.capacity()) { 367 dest = CharBuffer.allocate(dest.capacity()+1).put(dest); 368 dest.flip(); 369 } 370 return dest; 371 } else if (result.isOverflow()) { // buffer too small; expand 372 int newCapacity = 373 10 + dest.capacity() + 374 (int)(inbuf.remaining()*decoder.maxCharsPerByte()); 375 dest = CharBuffer.allocate(newCapacity).put(dest); 376 } else if (result.isMalformed() || result.isUnmappable()) { 377 // bad character in input 378 StringBuilder unmappable = new StringBuilder(); 379 int len = result.length(); 380 381 for (int i = 0; i < len; i++) { 382 unmappable.append(String.format("%02X", inbuf.get())); 383 } 384 385 String charsetName = charset == null ? encodingName : charset.name(); 386 387 log.error(dest.limit(), 388 Errors.IllegalCharForEncoding(unmappable.toString(), charsetName)); 389 390 // undo the flip() to prepare the output buffer 391 // for more translation 392 dest.position(dest.limit()); 393 dest.limit(dest.capacity()); 394 dest.put((char)0xfffd); // backward compatible 395 } else { 396 throw new AssertionError(result); 397 } 398 } 399 // unreached 400 } 401 402 public CharsetDecoder getDecoder(String encodingName, boolean ignoreEncodingErrors) { 403 Charset cs = (this.charset == null) 404 ? Charset.forName(encodingName) 405 : this.charset; 406 CharsetDecoder decoder = cs.newDecoder(); 407 408 CodingErrorAction action; 409 if (ignoreEncodingErrors) 410 action = CodingErrorAction.REPLACE; 411 else 412 action = CodingErrorAction.REPORT; 413 414 return decoder 415 .onMalformedInput(action) 416 .onUnmappableCharacter(action); 417 } 418 // </editor-fold> 419 420 // <editor-fold defaultstate="collapsed" desc="ByteBuffers"> 421 /** 422 * Make a byte buffer from an input stream. 423 * @param in the stream 424 * @return a byte buffer containing the contents of the stream 425 * @throws IOException if an error occurred while reading the stream 426 */ 427 @SuppressWarnings("cast") 428 public ByteBuffer makeByteBuffer(InputStream in) 429 throws IOException { 430 int limit = in.available(); 431 if (limit < 1024) limit = 1024; 432 ByteBuffer result = byteBufferCache.get(limit); 433 int position = 0; 434 while (in.available() != 0) { 435 if (position >= limit) 436 // expand buffer 437 result = ByteBuffer. 438 allocate(limit <<= 1). 439 put((ByteBuffer)result.flip()); 440 int count = in.read(result.array(), 441 position, 442 limit - position); 443 if (count < 0) break; 444 result.position(position += count); 445 } 446 return (ByteBuffer)result.flip(); 447 } 448 449 public void recycleByteBuffer(ByteBuffer bb) { 450 byteBufferCache.put(bb); 451 } 452 453 /** 454 * A single-element cache of direct byte buffers. 455 */ 456 @SuppressWarnings("cast") 457 private static class ByteBufferCache { 458 private ByteBuffer cached; 459 ByteBuffer get(int capacity) { 460 if (capacity < 20480) capacity = 20480; 461 ByteBuffer result = 462 (cached != null && cached.capacity() >= capacity) 463 ? (ByteBuffer)cached.clear() 464 : ByteBuffer.allocate(capacity + capacity>>1); 465 cached = null; 466 return result; 467 } 468 void put(ByteBuffer x) { 469 cached = x; 470 } 471 } 472 473 private final ByteBufferCache byteBufferCache; 474 // </editor-fold> 475 476 // <editor-fold defaultstate="collapsed" desc="Content cache"> 477 public CharBuffer getCachedContent(JavaFileObject file) { 478 ContentCacheEntry e = contentCache.get(file); 479 if (e == null) 480 return null; 481 482 if (!e.isValid(file)) { 483 contentCache.remove(file); 484 return null; 485 } 486 487 return e.getValue(); 488 } 489 490 public void cache(JavaFileObject file, CharBuffer cb) { 491 contentCache.put(file, new ContentCacheEntry(file, cb)); 492 } 493 494 public void flushCache(JavaFileObject file) { 495 contentCache.remove(file); 496 } 497 498 protected final Map<JavaFileObject, ContentCacheEntry> contentCache = new HashMap<>(); 499 500 protected static class ContentCacheEntry { 501 final long timestamp; 502 final SoftReference<CharBuffer> ref; 503 504 ContentCacheEntry(JavaFileObject file, CharBuffer cb) { 505 this.timestamp = file.getLastModified(); 506 this.ref = new SoftReference<>(cb); 507 } 508 509 boolean isValid(JavaFileObject file) { 510 return timestamp == file.getLastModified(); 511 } 512 513 CharBuffer getValue() { 514 return ref.get(); 515 } 516 } 517 // </editor-fold> 518 519 public static Kind getKind(Path path) { 520 return getKind(path.getFileName().toString()); 521 } 522 523 public static Kind getKind(String name) { 524 if (name.endsWith(Kind.CLASS.extension)) 525 return Kind.CLASS; 526 else if (name.endsWith(Kind.SOURCE.extension)) 527 return Kind.SOURCE; 528 else if (name.endsWith(Kind.HTML.extension)) 529 return Kind.HTML; 530 else 531 return Kind.OTHER; 532 } 533 534 protected static <T> T nullCheck(T o) { 535 return Objects.requireNonNull(o); 536 } 537 538 protected static <T> Collection<T> nullCheck(Collection<T> it) { 539 for (T t : it) 540 Objects.requireNonNull(t); 541 return it; 542 } 543 }