J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.java; |
| 27 | |
| 28 | import java.util.*; |
| 29 | import java.io.OutputStream; |
| 30 | import java.io.PrintStream; |
| 31 | import sun.tools.tree.Context; |
| 32 | import sun.tools.tree.Vset; |
| 33 | import sun.tools.tree.Expression; |
| 34 | import sun.tools.tree.LocalMember; |
| 35 | import sun.tools.tree.UplevelReference; |
| 36 | |
| 37 | /** |
| 38 | * This class is a Java class definition |
| 39 | * |
| 40 | * WARNING: The contents of this source file are not part of any |
| 41 | * supported API. Code that depends on them does so at its own risk: |
| 42 | * they are subject to change or removal without notice. |
| 43 | */ |
| 44 | public |
| 45 | class ClassDefinition implements Constants { |
| 46 | |
| 47 | protected Object source; |
| 48 | protected long where; |
| 49 | protected int modifiers; |
| 50 | protected Identifier localName; // for local classes |
| 51 | protected ClassDeclaration declaration; |
| 52 | protected IdentifierToken superClassId; |
| 53 | protected IdentifierToken interfaceIds[]; |
| 54 | protected ClassDeclaration superClass; |
| 55 | protected ClassDeclaration interfaces[]; |
| 56 | protected ClassDefinition outerClass; |
| 57 | protected MemberDefinition outerMember; |
| 58 | protected MemberDefinition innerClassMember; // field for me in outerClass |
| 59 | protected MemberDefinition firstMember; |
| 60 | protected MemberDefinition lastMember; |
| 61 | protected boolean resolved; |
| 62 | protected String documentation; |
| 63 | protected boolean error; |
| 64 | protected boolean nestError; |
| 65 | protected UplevelReference references; |
| 66 | protected boolean referencesFrozen; |
| 67 | private Hashtable fieldHash = new Hashtable(31); |
| 68 | private int abstr; |
| 69 | |
| 70 | // Table of local and anonymous classes whose internal names are constructed |
| 71 | // using the current class as a prefix. This is part of a fix for |
| 72 | // bugid 4054523 and 4030421. See also 'Environment.getClassDefinition' |
| 73 | // and 'BatchEnvironment.makeClassDefinition'. Allocated on demand. |
| 74 | private Hashtable localClasses = null; |
| 75 | private final int LOCAL_CLASSES_SIZE = 31; |
| 76 | |
| 77 | // The immediately surrounding context in which the class appears. |
| 78 | // Set at the beginning of checking, upon entry to 'SourceClass.checkInternal'. |
| 79 | // Null for classes that are not local or inside a local class. |
| 80 | // At present, this field exists only for the benefit of 'resolveName' as part |
| 81 | // of the fix for 4095716. |
| 82 | protected Context classContext; |
| 83 | |
| 84 | // The saved class context is now also used in 'SourceClass.getAccessMember'. |
| 85 | // Provide read-only access via this method. Part of fix for 4098093. |
| 86 | public Context getClassContext() { |
| 87 | return classContext; |
| 88 | } |
| 89 | |
| 90 | |
| 91 | /** |
| 92 | * Constructor |
| 93 | */ |
| 94 | protected ClassDefinition(Object source, long where, ClassDeclaration declaration, |
| 95 | int modifiers, IdentifierToken superClass, IdentifierToken interfaces[]) { |
| 96 | this.source = source; |
| 97 | this.where = where; |
| 98 | this.declaration = declaration; |
| 99 | this.modifiers = modifiers; |
| 100 | this.superClassId = superClass; |
| 101 | this.interfaceIds = interfaces; |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Get the source of the class |
| 106 | */ |
| 107 | public final Object getSource() { |
| 108 | return source; |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Check if there were any errors in this class. |
| 113 | */ |
| 114 | public final boolean getError() { |
| 115 | return error; |
| 116 | } |
| 117 | |
| 118 | /** |
| 119 | * Mark this class to be erroneous. |
| 120 | */ |
| 121 | public final void setError() { |
| 122 | this.error = true; |
| 123 | setNestError(); |
| 124 | } |
| 125 | |
| 126 | /** |
| 127 | * Check if there were any errors in our class nest. |
| 128 | */ |
| 129 | public final boolean getNestError() { |
| 130 | // Check to see if our error value is set, or if any of our |
| 131 | // outer classes' error values are set. This will work in |
| 132 | // conjunction with setError(), which sets the error value |
| 133 | // of its outer class, to yield true is any of our nest |
| 134 | // siblings has an error. This addresses bug 4111488: either |
| 135 | // code should be generated for all classes in a nest, or |
| 136 | // none of them. |
| 137 | return nestError || ((outerClass != null) ? outerClass.getNestError() : false); |
| 138 | } |
| 139 | |
| 140 | /** |
| 141 | * Mark this class, and all siblings in its class nest, to be |
| 142 | * erroneous. |
| 143 | */ |
| 144 | public final void setNestError() { |
| 145 | this.nestError = true; |
| 146 | if (outerClass != null) { |
| 147 | // If we have an outer class, set it to be erroneous as well. |
| 148 | // This will work in conjunction with getError(), which checks |
| 149 | // the error value of its outer class, to set the whole class |
| 150 | // nest to be erroneous. This address bug 4111488: either |
| 151 | // code should be generated for all classes in a nest, or |
| 152 | // none of them. |
| 153 | outerClass.setNestError(); |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Get the position in the input |
| 159 | */ |
| 160 | public final long getWhere() { |
| 161 | return where; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Get the class declaration |
| 166 | */ |
| 167 | public final ClassDeclaration getClassDeclaration() { |
| 168 | return declaration; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Get the class' modifiers |
| 173 | */ |
| 174 | public final int getModifiers() { |
| 175 | return modifiers; |
| 176 | } |
| 177 | public final void subModifiers(int mod) { |
| 178 | modifiers &= ~mod; |
| 179 | } |
| 180 | public final void addModifiers(int mod) { |
| 181 | modifiers |= mod; |
| 182 | } |
| 183 | |
| 184 | // *** DEBUG *** |
| 185 | protected boolean supersCheckStarted = !(this instanceof sun.tools.javac.SourceClass); |
| 186 | |
| 187 | /** |
| 188 | * Get the class' super class |
| 189 | */ |
| 190 | public final ClassDeclaration getSuperClass() { |
| 191 | /*--- |
| 192 | if (superClass == null && superClassId != null) |
| 193 | throw new CompilerError("getSuperClass "+superClassId); |
| 194 | // There are obscure cases where null is the right answer, |
| 195 | // in order to enable some error reporting later on. |
| 196 | // For example: class T extends T.N { class N { } } |
| 197 | ---*/ |
| 198 | |
| 199 | // *** DEBUG *** |
| 200 | // This method should not be called if the superclass has not been resolved. |
| 201 | if (!supersCheckStarted) throw new CompilerError("unresolved super"); |
| 202 | |
| 203 | return superClass; |
| 204 | } |
| 205 | |
| 206 | /** |
| 207 | * Get the super class, and resolve names now if necessary. |
| 208 | * |
| 209 | * It is only possible to resolve names at this point if we are |
| 210 | * a source class. The provision of this method at this level |
| 211 | * in the class hierarchy is dubious, but see 'getInnerClass' below. |
| 212 | * All other calls to 'getSuperClass(env)' appear in 'SourceClass'. |
| 213 | * NOTE: An older definition of this method has been moved to |
| 214 | * 'SourceClass', where it overrides this one. |
| 215 | * |
| 216 | * @see #resolveTypeStructure |
| 217 | */ |
| 218 | |
| 219 | public ClassDeclaration getSuperClass(Environment env) { |
| 220 | return getSuperClass(); |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * Get the class' interfaces |
| 225 | */ |
| 226 | public final ClassDeclaration getInterfaces()[] { |
| 227 | if (interfaces == null) throw new CompilerError("getInterfaces"); |
| 228 | return interfaces; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * Get the class' enclosing class (or null if not inner) |
| 233 | */ |
| 234 | public final ClassDefinition getOuterClass() { |
| 235 | return outerClass; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Set the class' enclosing class. Must be done at most once. |
| 240 | */ |
| 241 | protected final void setOuterClass(ClassDefinition outerClass) { |
| 242 | if (this.outerClass != null) throw new CompilerError("setOuterClass"); |
| 243 | this.outerClass = outerClass; |
| 244 | } |
| 245 | |
| 246 | /** |
| 247 | * Set the class' enclosing current instance pointer. |
| 248 | * Must be done at most once. |
| 249 | */ |
| 250 | protected final void setOuterMember(MemberDefinition outerMember) { |
| 251 | |
| 252 | if (isStatic() || !isInnerClass()) throw new CompilerError("setOuterField"); |
| 253 | if (this.outerMember != null) throw new CompilerError("setOuterField"); |
| 254 | this.outerMember = outerMember; |
| 255 | } |
| 256 | |
| 257 | /** |
| 258 | * Tell if the class is inner. |
| 259 | * This predicate also returns true for top-level nested types. |
| 260 | * To test for a true inner class as seen by the programmer, |
| 261 | * use <tt>!isTopLevel()</tt>. |
| 262 | */ |
| 263 | public final boolean isInnerClass() { |
| 264 | return outerClass != null; |
| 265 | } |
| 266 | |
| 267 | /** |
| 268 | * Tell if the class is a member of another class. |
| 269 | * This is false for package members and for block-local classes. |
| 270 | */ |
| 271 | public final boolean isMember() { |
| 272 | return outerClass != null && !isLocal(); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Tell if the class is "top-level", which is either a package member, |
| 277 | * or a static member of another top-level class. |
| 278 | */ |
| 279 | public final boolean isTopLevel() { |
| 280 | return outerClass == null || isStatic() || isInterface(); |
| 281 | } |
| 282 | |
| 283 | /** |
| 284 | * Tell if the class is local or inside a local class, |
| 285 | * which means it cannot be mentioned outside of its file. |
| 286 | */ |
| 287 | |
| 288 | // The comment above is true only because M_LOCAL is set |
| 289 | // whenever M_ANONYMOUS is. I think it is risky to assume that |
| 290 | // isAnonymous(x) => isLocal(x). |
| 291 | |
| 292 | public final boolean isInsideLocal() { |
| 293 | return isLocal() || |
| 294 | (outerClass != null && outerClass.isInsideLocal()); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * Tell if the class is local or or anonymous class, or inside |
| 299 | * such a class, which means it cannot be mentioned outside of |
| 300 | * its file. |
| 301 | */ |
| 302 | public final boolean isInsideLocalOrAnonymous() { |
| 303 | return isLocal() || isAnonymous () || |
| 304 | (outerClass != null && outerClass.isInsideLocalOrAnonymous()); |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * Return a simple identifier for this class (idNull if anonymous). |
| 309 | */ |
| 310 | public Identifier getLocalName() { |
| 311 | if (localName != null) { |
| 312 | return localName; |
| 313 | } |
| 314 | // This is also the name of the innerClassMember, if any: |
| 315 | return getName().getFlatName().getName(); |
| 316 | } |
| 317 | |
| 318 | /** |
| 319 | * Set the local name of a class. Must be a local class. |
| 320 | */ |
| 321 | public void setLocalName(Identifier name) { |
| 322 | if (isLocal()) { |
| 323 | localName = name; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | /** |
| 328 | * If inner, get the field for this class in the enclosing class |
| 329 | */ |
| 330 | public final MemberDefinition getInnerClassMember() { |
| 331 | if (outerClass == null) |
| 332 | return null; |
| 333 | if (innerClassMember == null) { |
| 334 | // We must find the field in the outer class. |
| 335 | Identifier nm = getName().getFlatName().getName(); |
| 336 | for (MemberDefinition field = outerClass.getFirstMatch(nm); |
| 337 | field != null; field = field.getNextMatch()) { |
| 338 | if (field.isInnerClass()) { |
| 339 | innerClassMember = field; |
| 340 | break; |
| 341 | } |
| 342 | } |
| 343 | if (innerClassMember == null) |
| 344 | throw new CompilerError("getInnerClassField"); |
| 345 | } |
| 346 | return innerClassMember; |
| 347 | } |
| 348 | |
| 349 | /** |
| 350 | * If inner, return an innermost uplevel self pointer, if any exists. |
| 351 | * Otherwise, return null. |
| 352 | */ |
| 353 | public final MemberDefinition findOuterMember() { |
| 354 | return outerMember; |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * See if this is a (nested) static class. |
| 359 | */ |
| 360 | public final boolean isStatic() { |
| 361 | return (modifiers & ACC_STATIC) != 0; |
| 362 | } |
| 363 | |
| 364 | /** |
| 365 | * Get the class' top-level enclosing class |
| 366 | */ |
| 367 | public final ClassDefinition getTopClass() { |
| 368 | ClassDefinition p, q; |
| 369 | for (p = this; (q = p.outerClass) != null; p = q) |
| 370 | ; |
| 371 | return p; |
| 372 | } |
| 373 | |
| 374 | /** |
| 375 | * Get the class' first field or first match |
| 376 | */ |
| 377 | public final MemberDefinition getFirstMember() { |
| 378 | return firstMember; |
| 379 | } |
| 380 | public final MemberDefinition getFirstMatch(Identifier name) { |
| 381 | return (MemberDefinition)fieldHash.get(name); |
| 382 | } |
| 383 | |
| 384 | /** |
| 385 | * Get the class' name |
| 386 | */ |
| 387 | public final Identifier getName() { |
| 388 | return declaration.getName(); |
| 389 | } |
| 390 | |
| 391 | /** |
| 392 | * Get the class' type |
| 393 | */ |
| 394 | public final Type getType() { |
| 395 | return declaration.getType(); |
| 396 | } |
| 397 | |
| 398 | /** |
| 399 | * Get the class' documentation |
| 400 | */ |
| 401 | public String getDocumentation() { |
| 402 | return documentation; |
| 403 | } |
| 404 | |
| 405 | /** |
| 406 | * Return true if the given documentation string contains a deprecation |
| 407 | * paragraph. This is true if the string contains the tag @deprecated |
| 408 | * is the first word in a line. |
| 409 | */ |
| 410 | public static boolean containsDeprecated(String documentation) { |
| 411 | if (documentation == null) { |
| 412 | return false; |
| 413 | } |
| 414 | doScan: |
| 415 | for (int scan = 0; |
| 416 | (scan = documentation.indexOf(paraDeprecated, scan)) >= 0; |
| 417 | scan += paraDeprecated.length()) { |
| 418 | // make sure there is only whitespace between this word |
| 419 | // and the beginning of the line |
| 420 | for (int beg = scan-1; beg >= 0; beg--) { |
| 421 | char ch = documentation.charAt(beg); |
| 422 | if (ch == '\n' || ch == '\r') { |
| 423 | break; // OK |
| 424 | } |
| 425 | if (!Character.isSpace(ch)) { |
| 426 | continue doScan; |
| 427 | } |
| 428 | } |
| 429 | // make sure the char after the word is space or end of line |
| 430 | int end = scan+paraDeprecated.length(); |
| 431 | if (end < documentation.length()) { |
| 432 | char ch = documentation.charAt(end); |
| 433 | if (!(ch == '\n' || ch == '\r') && !Character.isSpace(ch)) { |
| 434 | continue doScan; |
| 435 | } |
| 436 | } |
| 437 | return true; |
| 438 | } |
| 439 | return false; |
| 440 | } |
| 441 | |
| 442 | public final boolean inSamePackage(ClassDeclaration c) { |
| 443 | // find out if the class stored in c is defined in the same |
| 444 | // package as the current class. |
| 445 | return inSamePackage(c.getName().getQualifier()); |
| 446 | } |
| 447 | |
| 448 | public final boolean inSamePackage(ClassDefinition c) { |
| 449 | // find out if the class stored in c is defined in the same |
| 450 | // package as the current class. |
| 451 | return inSamePackage(c.getName().getQualifier()); |
| 452 | } |
| 453 | |
| 454 | public final boolean inSamePackage(Identifier packageName) { |
| 455 | return (getName().getQualifier().equals(packageName)); |
| 456 | } |
| 457 | |
| 458 | /** |
| 459 | * Checks |
| 460 | */ |
| 461 | public final boolean isInterface() { |
| 462 | return (getModifiers() & M_INTERFACE) != 0; |
| 463 | } |
| 464 | public final boolean isClass() { |
| 465 | return (getModifiers() & M_INTERFACE) == 0; |
| 466 | } |
| 467 | public final boolean isPublic() { |
| 468 | return (getModifiers() & M_PUBLIC) != 0; |
| 469 | } |
| 470 | public final boolean isPrivate() { |
| 471 | return (getModifiers() & M_PRIVATE) != 0; |
| 472 | } |
| 473 | public final boolean isProtected() { |
| 474 | return (getModifiers() & M_PROTECTED) != 0; |
| 475 | } |
| 476 | public final boolean isPackagePrivate() { |
| 477 | return (modifiers & (M_PUBLIC | M_PRIVATE | M_PROTECTED)) == 0; |
| 478 | } |
| 479 | public final boolean isFinal() { |
| 480 | return (getModifiers() & M_FINAL) != 0; |
| 481 | } |
| 482 | public final boolean isAbstract() { |
| 483 | return (getModifiers() & M_ABSTRACT) != 0; |
| 484 | } |
| 485 | public final boolean isSynthetic() { |
| 486 | return (getModifiers() & M_SYNTHETIC) != 0; |
| 487 | } |
| 488 | public final boolean isDeprecated() { |
| 489 | return (getModifiers() & M_DEPRECATED) != 0; |
| 490 | } |
| 491 | public final boolean isAnonymous() { |
| 492 | return (getModifiers() & M_ANONYMOUS) != 0; |
| 493 | } |
| 494 | public final boolean isLocal() { |
| 495 | return (getModifiers() & M_LOCAL) != 0; |
| 496 | } |
| 497 | public final boolean hasConstructor() { |
| 498 | return getFirstMatch(idInit) != null; |
| 499 | } |
| 500 | |
| 501 | |
| 502 | /** |
| 503 | * Check to see if a class must be abstract. This method replaces |
| 504 | * isAbstract(env) |
| 505 | */ |
| 506 | public final boolean mustBeAbstract(Environment env) { |
| 507 | // If it is declared abstract, return true. |
| 508 | // (Fix for 4110534.) |
| 509 | if (isAbstract()) { |
| 510 | return true; |
| 511 | } |
| 512 | |
| 513 | // Check to see if the class should have been declared to be |
| 514 | // abstract. |
| 515 | |
| 516 | // We make sure that the inherited method collection has been |
| 517 | // performed. |
| 518 | collectInheritedMethods(env); |
| 519 | |
| 520 | // We check for any abstract methods inherited or declared |
| 521 | // by this class. |
| 522 | Iterator methods = getMethods(); |
| 523 | while (methods.hasNext()) { |
| 524 | MemberDefinition method = (MemberDefinition) methods.next(); |
| 525 | |
| 526 | if (method.isAbstract()) { |
| 527 | return true; |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | // We check for hidden "permanently abstract" methods in |
| 532 | // our superclasses. |
| 533 | return getPermanentlyAbstractMethods().hasNext(); |
| 534 | } |
| 535 | |
| 536 | /** |
| 537 | * Check if this is a super class of another class |
| 538 | */ |
| 539 | public boolean superClassOf(Environment env, ClassDeclaration otherClass) |
| 540 | throws ClassNotFound { |
| 541 | while (otherClass != null) { |
| 542 | if (getClassDeclaration().equals(otherClass)) { |
| 543 | return true; |
| 544 | } |
| 545 | otherClass = otherClass.getClassDefinition(env).getSuperClass(); |
| 546 | } |
| 547 | return false; |
| 548 | } |
| 549 | |
| 550 | /** |
| 551 | * Check if this is an enclosing class of another class |
| 552 | */ |
| 553 | public boolean enclosingClassOf(ClassDefinition otherClass) { |
| 554 | while ((otherClass = otherClass.getOuterClass()) != null) { |
| 555 | if (this == otherClass) { |
| 556 | return true; |
| 557 | } |
| 558 | } |
| 559 | return false; |
| 560 | } |
| 561 | |
| 562 | /** |
| 563 | * Check if this is a sub class of another class |
| 564 | */ |
| 565 | public boolean subClassOf(Environment env, ClassDeclaration otherClass) throws ClassNotFound { |
| 566 | ClassDeclaration c = getClassDeclaration(); |
| 567 | while (c != null) { |
| 568 | if (c.equals(otherClass)) { |
| 569 | return true; |
| 570 | } |
| 571 | c = c.getClassDefinition(env).getSuperClass(); |
| 572 | } |
| 573 | return false; |
| 574 | } |
| 575 | |
| 576 | /** |
| 577 | * Check if this class is implemented by another class |
| 578 | */ |
| 579 | public boolean implementedBy(Environment env, ClassDeclaration c) throws ClassNotFound { |
| 580 | for (; c != null ; c = c.getClassDefinition(env).getSuperClass()) { |
| 581 | if (getClassDeclaration().equals(c)) { |
| 582 | return true; |
| 583 | } |
| 584 | ClassDeclaration intf[] = c.getClassDefinition(env).getInterfaces(); |
| 585 | for (int i = 0 ; i < intf.length ; i++) { |
| 586 | if (implementedBy(env, intf[i])) { |
| 587 | return true; |
| 588 | } |
| 589 | } |
| 590 | } |
| 591 | return false; |
| 592 | } |
| 593 | |
| 594 | /** |
| 595 | * Check to see if a class which implements interface `this' could |
| 596 | * possibly implement the interface `intDef'. Note that the only |
| 597 | * way that this can fail is if `this' and `intDef' have methods |
| 598 | * which are of the same signature and different return types. This |
| 599 | * method is used by Environment.explicitCast() to determine if a |
| 600 | * cast between two interfaces is legal. |
| 601 | * |
| 602 | * This method should only be called on a class after it has been |
| 603 | * basicCheck()'ed. |
| 604 | */ |
| 605 | public boolean couldImplement(ClassDefinition intDef) { |
| 606 | // Check to see if we could have done the necessary checks. |
| 607 | if (!doInheritanceChecks) { |
| 608 | throw new CompilerError("couldImplement: no checks"); |
| 609 | } |
| 610 | |
| 611 | // This method should only be called for interfaces. |
| 612 | if (!isInterface() || !intDef.isInterface()) { |
| 613 | throw new CompilerError("couldImplement: not interface"); |
| 614 | } |
| 615 | |
| 616 | // Make sure we are not called before we have collected our |
| 617 | // inheritance information. |
| 618 | if (allMethods == null) { |
| 619 | throw new CompilerError("couldImplement: called early"); |
| 620 | } |
| 621 | |
| 622 | // Get the other classes' methods. getMethods() in |
| 623 | // general can return methods which are not visible to the |
| 624 | // current package. We need to make sure that these do not |
| 625 | // prevent this class from being implemented. |
| 626 | Iterator otherMethods = intDef.getMethods(); |
| 627 | |
| 628 | while (otherMethods.hasNext()) { |
| 629 | // Get one of the methods from intDef... |
| 630 | MemberDefinition method = |
| 631 | (MemberDefinition) otherMethods.next(); |
| 632 | |
| 633 | Identifier name = method.getName(); |
| 634 | Type type = method.getType(); |
| 635 | |
| 636 | // See if we implement a method of the same signature... |
| 637 | MemberDefinition myMethod = allMethods.lookupSig(name, type); |
| 638 | |
| 639 | //System.out.println("Comparing\n\t" + myMethod + |
| 640 | // "\nand\n\t" + method); |
| 641 | |
| 642 | if (myMethod != null) { |
| 643 | // We do. Make sure the methods have the same return type. |
| 644 | if (!myMethod.sameReturnType(method)) { |
| 645 | return false; |
| 646 | } |
| 647 | } |
| 648 | } |
| 649 | |
| 650 | return true; |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Check if another class can be accessed from the 'extends' or 'implements' |
| 655 | * clause of this class. |
| 656 | */ |
| 657 | public boolean extendsCanAccess(Environment env, ClassDeclaration c) throws ClassNotFound { |
| 658 | |
| 659 | // Names in the 'extends' or 'implements' clause of an inner class |
| 660 | // are checked as if they appeared in the body of the surrounding class. |
| 661 | if (outerClass != null) { |
| 662 | return outerClass.canAccess(env, c); |
| 663 | } |
| 664 | |
| 665 | // We are a package member. |
| 666 | |
| 667 | ClassDefinition cdef = c.getClassDefinition(env); |
| 668 | |
| 669 | if (cdef.isLocal()) { |
| 670 | // No locals should be in scope in the 'extends' or |
| 671 | // 'implements' clause of a package member. |
| 672 | throw new CompilerError("top local"); |
| 673 | } |
| 674 | |
| 675 | if (cdef.isInnerClass()) { |
| 676 | MemberDefinition f = cdef.getInnerClassMember(); |
| 677 | |
| 678 | // Access to public member is always allowed. |
| 679 | if (f.isPublic()) { |
| 680 | return true; |
| 681 | } |
| 682 | |
| 683 | // Private access is ok only from the same class nest. This can |
| 684 | // happen only if the class represented by 'this' encloses the inner |
| 685 | // class represented by 'f'. |
| 686 | if (f.isPrivate()) { |
| 687 | return getClassDeclaration().equals(f.getTopClass().getClassDeclaration()); |
| 688 | } |
| 689 | |
| 690 | // Protected or default access -- allow access if in same package. |
| 691 | return getName().getQualifier().equals(f.getClassDeclaration().getName().getQualifier()); |
| 692 | } |
| 693 | |
| 694 | // Access to public member is always allowed. |
| 695 | if (cdef.isPublic()) { |
| 696 | return true; |
| 697 | } |
| 698 | |
| 699 | // Default access -- allow access if in same package. |
| 700 | return getName().getQualifier().equals(c.getName().getQualifier()); |
| 701 | } |
| 702 | |
| 703 | /** |
| 704 | * Check if another class can be accessed from within the body of this class. |
| 705 | */ |
| 706 | public boolean canAccess(Environment env, ClassDeclaration c) throws ClassNotFound { |
| 707 | ClassDefinition cdef = c.getClassDefinition(env); |
| 708 | |
| 709 | if (cdef.isLocal()) { |
| 710 | // if it's in scope, it's accessible |
| 711 | return true; |
| 712 | } |
| 713 | |
| 714 | if (cdef.isInnerClass()) { |
| 715 | return canAccess(env, cdef.getInnerClassMember()); |
| 716 | } |
| 717 | |
| 718 | // Public access is always ok |
| 719 | if (cdef.isPublic()) { |
| 720 | return true; |
| 721 | } |
| 722 | |
| 723 | // It must be in the same package |
| 724 | return getName().getQualifier().equals(c.getName().getQualifier()); |
| 725 | } |
| 726 | |
| 727 | /** |
| 728 | * Check if a field can be accessed from a class |
| 729 | */ |
| 730 | |
| 731 | public boolean canAccess(Environment env, MemberDefinition f) |
| 732 | throws ClassNotFound { |
| 733 | |
| 734 | // Public access is always ok |
| 735 | if (f.isPublic()) { |
| 736 | return true; |
| 737 | } |
| 738 | // Protected access is ok from a subclass |
| 739 | if (f.isProtected() && subClassOf(env, f.getClassDeclaration())) { |
| 740 | return true; |
| 741 | } |
| 742 | // Private access is ok only from the same class nest |
| 743 | if (f.isPrivate()) { |
| 744 | return getTopClass().getClassDeclaration() |
| 745 | .equals(f.getTopClass().getClassDeclaration()); |
| 746 | } |
| 747 | // It must be in the same package |
| 748 | return getName().getQualifier().equals(f.getClassDeclaration().getName().getQualifier()); |
| 749 | } |
| 750 | |
| 751 | /** |
| 752 | * Check if a class is entitled to inline access to a class from |
| 753 | * another class. |
| 754 | */ |
| 755 | public boolean permitInlinedAccess(Environment env, ClassDeclaration c) |
| 756 | throws ClassNotFound { |
| 757 | |
| 758 | return (env.opt() && c.equals(declaration)) || |
| 759 | (env.opt_interclass() && canAccess(env, c)); |
| 760 | } |
| 761 | |
| 762 | /** |
| 763 | * Check if a class is entitled to inline access to a method from |
| 764 | * another class. |
| 765 | */ |
| 766 | public boolean permitInlinedAccess(Environment env, MemberDefinition f) |
| 767 | throws ClassNotFound { |
| 768 | return (env.opt() |
| 769 | && (f.clazz.getClassDeclaration().equals(declaration))) || |
| 770 | (env.opt_interclass() && canAccess(env, f)); |
| 771 | } |
| 772 | |
| 773 | /** |
| 774 | * We know the the field is marked protected (and not public) and that |
| 775 | * the field is visible (as per canAccess). Can we access the field as |
| 776 | * <accessor>.<field>, where <accessor> has the type <accessorType>? |
| 777 | * |
| 778 | * Protected fields can only be accessed when the accessorType is a |
| 779 | * subclass of the current class |
| 780 | */ |
| 781 | public boolean protectedAccess(Environment env, MemberDefinition f, |
| 782 | Type accessorType) |
| 783 | throws ClassNotFound |
| 784 | { |
| 785 | |
| 786 | return |
| 787 | // static protected fields are accessible |
| 788 | f.isStatic() |
| 789 | || // allow array.clone() |
| 790 | (accessorType.isType(TC_ARRAY) && (f.getName() == idClone) |
| 791 | && (f.getType().getArgumentTypes().length == 0)) |
| 792 | || // <accessorType> is a subtype of the current class |
| 793 | (accessorType.isType(TC_CLASS) |
| 794 | && env.getClassDefinition(accessorType.getClassName()) |
| 795 | .subClassOf(env, getClassDeclaration())) |
| 796 | || // we are accessing the field from a friendly class (same package) |
| 797 | (getName().getQualifier() |
| 798 | .equals(f.getClassDeclaration().getName().getQualifier())); |
| 799 | } |
| 800 | |
| 801 | |
| 802 | /** |
| 803 | * Find or create an access method for a private member, |
| 804 | * or return null if this is not possible. |
| 805 | */ |
| 806 | public MemberDefinition getAccessMember(Environment env, Context ctx, |
| 807 | MemberDefinition field, boolean isSuper) { |
| 808 | throw new CompilerError("binary getAccessMember"); |
| 809 | } |
| 810 | |
| 811 | /** |
| 812 | * Find or create an update method for a private member, |
| 813 | * or return null if this is not possible. |
| 814 | */ |
| 815 | public MemberDefinition getUpdateMember(Environment env, Context ctx, |
| 816 | MemberDefinition field, boolean isSuper) { |
| 817 | throw new CompilerError("binary getUpdateMember"); |
| 818 | } |
| 819 | |
| 820 | /** |
| 821 | * Get a field from this class. Report ambiguous fields. |
| 822 | * If no accessible field is found, this method may return an |
| 823 | * inaccessible field to allow a useful error message. |
| 824 | * |
| 825 | * getVariable now takes the source class `source' as an argument. |
| 826 | * This allows getVariable to check whether a field is inaccessible |
| 827 | * before it signals that a field is ambiguous. The compiler used to |
| 828 | * signal an ambiguity even when one of the fields involved was not |
| 829 | * accessible. (bug 4053724) |
| 830 | */ |
| 831 | public MemberDefinition getVariable(Environment env, |
| 832 | Identifier nm, |
| 833 | ClassDefinition source) |
| 834 | throws AmbiguousMember, ClassNotFound { |
| 835 | |
| 836 | return getVariable0(env, nm, source, true, true); |
| 837 | } |
| 838 | |
| 839 | /* |
| 840 | * private fields are never inherited. package-private fields are |
| 841 | * not inherited across package boundaries. To capture this, we |
| 842 | * take two booleans as parameters: showPrivate indicates whether |
| 843 | * we have passed a class boundary, and showPackage indicates whether |
| 844 | * we have crossed a package boundary. |
| 845 | */ |
| 846 | private MemberDefinition getVariable0(Environment env, |
| 847 | Identifier nm, |
| 848 | ClassDefinition source, |
| 849 | boolean showPrivate, |
| 850 | boolean showPackage) |
| 851 | throws AmbiguousMember, ClassNotFound { |
| 852 | |
| 853 | // Check to see if this field is defined in the current class |
| 854 | for (MemberDefinition member = getFirstMatch(nm); |
| 855 | member != null; |
| 856 | member = member.getNextMatch()) { |
| 857 | if (member.isVariable()) { |
| 858 | if ((showPrivate || !member.isPrivate()) && |
| 859 | (showPackage || !member.isPackagePrivate())) { |
| 860 | // It is defined in this class. |
| 861 | return member; |
| 862 | } else { |
| 863 | // Even though this definition is not inherited, |
| 864 | // it hides all definitions in supertypes. |
| 865 | return null; |
| 866 | } |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | // Find the field in our superclass. |
| 871 | ClassDeclaration sup = getSuperClass(); |
| 872 | MemberDefinition field = null; |
| 873 | if (sup != null) { |
| 874 | field = |
| 875 | sup.getClassDefinition(env) |
| 876 | .getVariable0(env, nm, source, |
| 877 | false, |
| 878 | showPackage && inSamePackage(sup)); |
| 879 | } |
| 880 | |
| 881 | // Find the field in our superinterfaces. |
| 882 | for (int i = 0 ; i < interfaces.length ; i++) { |
| 883 | // Try to look up the field in an interface. Since interfaces |
| 884 | // only have public fields, the values of the two boolean |
| 885 | // arguments are not important. |
| 886 | MemberDefinition field2 = |
| 887 | interfaces[i].getClassDefinition(env) |
| 888 | .getVariable0(env, nm, source, true, true); |
| 889 | |
| 890 | if (field2 != null) { |
| 891 | // If we have two different, accessible fields, then |
| 892 | // we've found an ambiguity. |
| 893 | if (field != null && |
| 894 | source.canAccess(env, field) && |
| 895 | field2 != field) { |
| 896 | |
| 897 | throw new AmbiguousMember(field2, field); |
| 898 | } |
| 899 | field = field2; |
| 900 | } |
| 901 | } |
| 902 | return field; |
| 903 | } |
| 904 | |
| 905 | /** |
| 906 | * Tells whether to report a deprecation error for this class. |
| 907 | */ |
| 908 | public boolean reportDeprecated(Environment env) { |
| 909 | return (isDeprecated() |
| 910 | || (outerClass != null && outerClass.reportDeprecated(env))); |
| 911 | } |
| 912 | |
| 913 | /** |
| 914 | * Note that this class is being used somehow by <tt>ref</tt>. |
| 915 | * Report deprecation errors, etc. |
| 916 | */ |
| 917 | public void noteUsedBy(ClassDefinition ref, long where, Environment env) { |
| 918 | // (Have this deal with canAccess() checks, too?) |
| 919 | if (reportDeprecated(env)) { |
| 920 | env.error(where, "warn.class.is.deprecated", this); |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | /** |
| 925 | * Get an inner class. |
| 926 | * Look in supers but not outers. |
| 927 | * (This is used directly to resolve expressions like "site.K", and |
| 928 | * inside a loop to resolve lone names like "K" or the "K" in "K.L".) |
| 929 | * |
| 930 | * Called from 'Context' and 'FieldExpression' as well as this class. |
| 931 | * |
| 932 | * @see FieldExpression.checkCommon |
| 933 | * @see resolveName |
| 934 | */ |
| 935 | public MemberDefinition getInnerClass(Environment env, Identifier nm) |
| 936 | throws ClassNotFound { |
| 937 | // Note: AmbiguousClass will not be thrown unless and until |
| 938 | // inner classes can be defined inside interfaces. |
| 939 | |
| 940 | // Check if it is defined in the current class |
| 941 | for (MemberDefinition field = getFirstMatch(nm); |
| 942 | field != null ; field = field.getNextMatch()) { |
| 943 | if (field.isInnerClass()) { |
| 944 | if (field.getInnerClass().isLocal()) { |
| 945 | continue; // ignore this name; it is internally generated |
| 946 | } |
| 947 | return field; |
| 948 | } |
| 949 | } |
| 950 | |
| 951 | // Get it from the super class |
| 952 | // It is likely that 'getSuperClass()' could be made to work here |
| 953 | // but we would have to assure somehow that 'resolveTypeStructure' |
| 954 | // has been called on the current class nest. Since we can get |
| 955 | // here from 'resolveName', which is called from 'resolveSupers', |
| 956 | // it is possible that the first attempt to resolve the superclass |
| 957 | // will originate here, instead of in the call to 'getSuperClass' |
| 958 | // in 'checkSupers'. See 'resolveTypeStructure', in which a call |
| 959 | // to 'resolveSupers' precedes the call to 'checkSupers'. Why is |
| 960 | // name resolution done twice, first in 'resolveName'? |
| 961 | // NOTE: 'SourceMember.resolveTypeStructure' may initiate type |
| 962 | // structure resolution for an inner class. Normally, this |
| 963 | // occurs during the resolution of the outer class, but fields |
| 964 | // added after the resolution of their containing class will |
| 965 | // be resolved late -- see 'addMember(env,field)' below. |
| 966 | // This should only happen for synthetic members, which should |
| 967 | // never be an inner class. |
| 968 | ClassDeclaration sup = getSuperClass(env); |
| 969 | if (sup != null) |
| 970 | return sup.getClassDefinition(env).getInnerClass(env, nm); |
| 971 | |
| 972 | return null; |
| 973 | } |
| 974 | |
| 975 | /** |
| 976 | * Lookup a method. This code implements the method lookup |
| 977 | * mechanism specified in JLS 15.11.2. |
| 978 | * |
| 979 | * This mechanism cannot be used to lookup synthetic methods. |
| 980 | */ |
| 981 | private MemberDefinition matchMethod(Environment env, |
| 982 | ClassDefinition accessor, |
| 983 | Identifier methodName, |
| 984 | Type[] argumentTypes, |
| 985 | boolean isAnonConstCall, |
| 986 | Identifier accessPackage) |
| 987 | throws AmbiguousMember, ClassNotFound { |
| 988 | |
| 989 | if (allMethods == null || !allMethods.isFrozen()) { |
| 990 | // This may be too restrictive. |
| 991 | throw new CompilerError("matchMethod called early"); |
| 992 | // collectInheritedMethods(env); |
| 993 | } |
| 994 | |
| 995 | // A tentative maximally specific method. |
| 996 | MemberDefinition tentative = null; |
| 997 | |
| 998 | // A list of other methods which may be maximally specific too. |
| 999 | List candidateList = null; |
| 1000 | |
| 1001 | // Get all the methods inherited by this class which |
| 1002 | // have the name `methodName'. |
| 1003 | Iterator methods = allMethods.lookupName(methodName); |
| 1004 | |
| 1005 | while (methods.hasNext()) { |
| 1006 | MemberDefinition method = (MemberDefinition)methods.next(); |
| 1007 | |
| 1008 | // See if this method is applicable. |
| 1009 | if (!env.isApplicable(method, argumentTypes)) { |
| 1010 | continue; |
| 1011 | } |
| 1012 | |
| 1013 | // See if this method is accessible. |
| 1014 | if (accessor != null) { |
| 1015 | if (!accessor.canAccess(env, method)) { |
| 1016 | continue; |
| 1017 | } |
| 1018 | } else if (isAnonConstCall) { |
| 1019 | if (method.isPrivate() || |
| 1020 | (method.isPackagePrivate() && |
| 1021 | accessPackage != null && |
| 1022 | !inSamePackage(accessPackage))) { |
| 1023 | // For anonymous constructor accesses, we |
| 1024 | // haven't yet built an accessing class. |
| 1025 | // We disallow anonymous classes from seeing |
| 1026 | // private/package-private inaccessible |
| 1027 | // constructors in their superclass. |
| 1028 | continue; |
| 1029 | } |
| 1030 | } else { |
| 1031 | // If accessor is null, we assume that the access |
| 1032 | // is allowed. Query: is this option used? |
| 1033 | } |
| 1034 | |
| 1035 | if (tentative == null) { |
| 1036 | // `method' becomes our tentative maximally specific match. |
| 1037 | tentative = method; |
| 1038 | } else { |
| 1039 | if (env.isMoreSpecific(method, tentative)) { |
| 1040 | // We have found a method which is a strictly better |
| 1041 | // match than `tentative'. Replace it. |
| 1042 | tentative = method; |
| 1043 | } else { |
| 1044 | // If this method could possibly be another |
| 1045 | // maximally specific method, add it to our |
| 1046 | // list of other candidates. |
| 1047 | if (!env.isMoreSpecific(tentative,method)) { |
| 1048 | if (candidateList == null) { |
| 1049 | candidateList = new ArrayList(); |
| 1050 | } |
| 1051 | candidateList.add(method); |
| 1052 | } |
| 1053 | } |
| 1054 | } |
| 1055 | } |
| 1056 | |
| 1057 | if (tentative != null && candidateList != null) { |
| 1058 | // Find out if our `tentative' match is a uniquely |
| 1059 | // maximally specific. |
| 1060 | Iterator candidates = candidateList.iterator(); |
| 1061 | while (candidates.hasNext()) { |
| 1062 | MemberDefinition method = (MemberDefinition)candidates.next(); |
| 1063 | if (!env.isMoreSpecific(tentative, method)) { |
| 1064 | throw new AmbiguousMember(tentative, method); |
| 1065 | } |
| 1066 | } |
| 1067 | } |
| 1068 | |
| 1069 | return tentative; |
| 1070 | } |
| 1071 | |
| 1072 | /** |
| 1073 | * Lookup a method. This code implements the method lookup |
| 1074 | * mechanism specified in JLS 15.11.2. |
| 1075 | * |
| 1076 | * This mechanism cannot be used to lookup synthetic methods. |
| 1077 | */ |
| 1078 | public MemberDefinition matchMethod(Environment env, |
| 1079 | ClassDefinition accessor, |
| 1080 | Identifier methodName, |
| 1081 | Type[] argumentTypes) |
| 1082 | throws AmbiguousMember, ClassNotFound { |
| 1083 | |
| 1084 | return matchMethod(env, accessor, methodName, |
| 1085 | argumentTypes, false, null); |
| 1086 | } |
| 1087 | |
| 1088 | /** |
| 1089 | * Lookup a method. This code implements the method lookup |
| 1090 | * mechanism specified in JLS 15.11.2. |
| 1091 | * |
| 1092 | * This mechanism cannot be used to lookup synthetic methods. |
| 1093 | */ |
| 1094 | public MemberDefinition matchMethod(Environment env, |
| 1095 | ClassDefinition accessor, |
| 1096 | Identifier methodName) |
| 1097 | throws AmbiguousMember, ClassNotFound { |
| 1098 | |
| 1099 | return matchMethod(env, accessor, methodName, |
| 1100 | Type.noArgs, false, null); |
| 1101 | } |
| 1102 | |
| 1103 | /** |
| 1104 | * A version of matchMethod to be used only for constructors |
| 1105 | * when we cannot pass in a sourceClass argument. We just assert |
| 1106 | * our package name. |
| 1107 | * |
| 1108 | * This is used only for anonymous classes, where we have to look up |
| 1109 | * a (potentially) protected constructor with no valid sourceClass |
| 1110 | * parameter available. |
| 1111 | */ |
| 1112 | public MemberDefinition matchAnonConstructor(Environment env, |
| 1113 | Identifier accessPackage, |
| 1114 | Type argumentTypes[]) |
| 1115 | throws AmbiguousMember, ClassNotFound { |
| 1116 | |
| 1117 | return matchMethod(env, null, idInit, argumentTypes, |
| 1118 | true, accessPackage); |
| 1119 | } |
| 1120 | |
| 1121 | /** |
| 1122 | * Find a method, ie: exact match in this class or any of the super |
| 1123 | * classes. |
| 1124 | * |
| 1125 | * Only called by javadoc. For now I am holding off rewriting this |
| 1126 | * code to rely on collectInheritedMethods(), as that code has |
| 1127 | * not gotten along with javadoc in the past. |
| 1128 | */ |
| 1129 | public MemberDefinition findMethod(Environment env, Identifier nm, Type t) |
| 1130 | throws ClassNotFound { |
| 1131 | // look in the current class |
| 1132 | MemberDefinition f; |
| 1133 | for (f = getFirstMatch(nm) ; f != null ; f = f.getNextMatch()) { |
| 1134 | // Note that non-method types return false for equalArguments(). |
| 1135 | if (f.getType().equalArguments(t)) { |
| 1136 | return f; |
| 1137 | } |
| 1138 | } |
| 1139 | |
| 1140 | // constructors are not inherited |
| 1141 | if (nm.equals(idInit)) { |
| 1142 | return null; |
| 1143 | } |
| 1144 | |
| 1145 | // look in the super class |
| 1146 | ClassDeclaration sup = getSuperClass(); |
| 1147 | if (sup == null) |
| 1148 | return null; |
| 1149 | |
| 1150 | return sup.getClassDefinition(env).findMethod(env, nm, t); |
| 1151 | } |
| 1152 | |
| 1153 | // We create a stub for this. Source classes do more work. |
| 1154 | protected void basicCheck(Environment env) throws ClassNotFound { |
| 1155 | // Do the outer class first. |
| 1156 | if (outerClass != null) |
| 1157 | outerClass.basicCheck(env); |
| 1158 | } |
| 1159 | |
| 1160 | /** |
| 1161 | * Check this class. |
| 1162 | */ |
| 1163 | public void check(Environment env) throws ClassNotFound { |
| 1164 | } |
| 1165 | |
| 1166 | public Vset checkLocalClass(Environment env, Context ctx, |
| 1167 | Vset vset, ClassDefinition sup, |
| 1168 | Expression args[], Type argTypes[] |
| 1169 | ) throws ClassNotFound { |
| 1170 | throw new CompilerError("checkLocalClass"); |
| 1171 | } |
| 1172 | |
| 1173 | //--------------------------------------------------------------- |
| 1174 | // The non-synthetic methods defined in this class or in any |
| 1175 | // of its parents (class or interface). This member is used |
| 1176 | // to cache work done in collectInheritedMethods for use by |
| 1177 | // getMethods() and matchMethod(). It should be accessed by |
| 1178 | // no other method without forethought. |
| 1179 | MethodSet allMethods = null; |
| 1180 | |
| 1181 | // One of our superclasses may contain an abstract method which |
| 1182 | // we are unable to ever implement. This happens when there is |
| 1183 | // a package-private abstract method in our parent and we are in |
| 1184 | // a different package than our parent. In these cases, we |
| 1185 | // keep a list of the "permanently abstract" or "unimplementable" |
| 1186 | // methods so that we can correctly detect that this class is |
| 1187 | // indeed abstract and so that we can give somewhat comprehensible |
| 1188 | // error messages. |
| 1189 | private List permanentlyAbstractMethods = new ArrayList(); |
| 1190 | |
| 1191 | /** |
| 1192 | * This method returns an Iterator of all abstract methods |
| 1193 | * in our superclasses which we are unable to implement. |
| 1194 | */ |
| 1195 | protected Iterator getPermanentlyAbstractMethods() { |
| 1196 | // This method can only be called after collectInheritedMethods. |
| 1197 | if (allMethods == null) { |
| 1198 | throw new CompilerError("isPermanentlyAbstract() called early"); |
| 1199 | } |
| 1200 | |
| 1201 | return permanentlyAbstractMethods.iterator(); |
| 1202 | } |
| 1203 | |
| 1204 | /** |
| 1205 | * A flag used by turnOffInheritanceChecks() to indicate if |
| 1206 | * inheritance checks are on or off. |
| 1207 | */ |
| 1208 | protected static boolean doInheritanceChecks = true; |
| 1209 | |
| 1210 | /** |
| 1211 | * This is a workaround to allow javadoc to turn off certain |
| 1212 | * inheritance/override checks which interfere with javadoc |
| 1213 | * badly. In the future it might be good to eliminate the |
| 1214 | * shared sources of javadoc and javac to avoid the need for this |
| 1215 | * sort of workaround. |
| 1216 | */ |
| 1217 | public static void turnOffInheritanceChecks() { |
| 1218 | doInheritanceChecks = false; |
| 1219 | } |
| 1220 | |
| 1221 | /** |
| 1222 | * Add all of the methods declared in or above `parent' to |
| 1223 | * `allMethods', the set of methods in the current class. |
| 1224 | * `myMethods' is the set of all methods declared in this |
| 1225 | * class, and `mirandaMethods' is a repository for Miranda methods. |
| 1226 | * If mirandaMethods is null, no mirandaMethods will be |
| 1227 | * generated. |
| 1228 | * |
| 1229 | * For a definition of Miranda methods, see the comment above the |
| 1230 | * method addMirandaMethods() which occurs later in this file. |
| 1231 | */ |
| 1232 | private void collectOneClass(Environment env, |
| 1233 | ClassDeclaration parent, |
| 1234 | MethodSet myMethods, |
| 1235 | MethodSet allMethods, |
| 1236 | MethodSet mirandaMethods) { |
| 1237 | |
| 1238 | // System.out.println("Inheriting methods from " + parent); |
| 1239 | |
| 1240 | try { |
| 1241 | ClassDefinition pClass = parent.getClassDefinition(env); |
| 1242 | Iterator methods = pClass.getMethods(env); |
| 1243 | while (methods.hasNext()) { |
| 1244 | MemberDefinition method = |
| 1245 | (MemberDefinition) methods.next(); |
| 1246 | |
| 1247 | // Private methods are not inherited. |
| 1248 | // |
| 1249 | // Constructors are not inherited. |
| 1250 | // |
| 1251 | // Any non-abstract methods in an interface come |
| 1252 | // from java.lang.Object. This means that they |
| 1253 | // should have already been added to allMethods |
| 1254 | // when we walked our superclass lineage. |
| 1255 | if (method.isPrivate() || |
| 1256 | method.isConstructor() || |
| 1257 | (pClass.isInterface() && !method.isAbstract())) { |
| 1258 | |
| 1259 | continue; |
| 1260 | } |
| 1261 | |
| 1262 | // Get the components of the methods' signature. |
| 1263 | Identifier name = method.getName(); |
| 1264 | Type type = method.getType(); |
| 1265 | |
| 1266 | // Check for a method of the same signature which |
| 1267 | // was locally declared. |
| 1268 | MemberDefinition override = |
| 1269 | myMethods.lookupSig(name, type); |
| 1270 | |
| 1271 | // Is this method inaccessible due to package-private |
| 1272 | // visibility? |
| 1273 | if (method.isPackagePrivate() && |
| 1274 | !inSamePackage(method.getClassDeclaration())) { |
| 1275 | |
| 1276 | if (override != null && this instanceof |
| 1277 | sun.tools.javac.SourceClass) { |
| 1278 | // We give a warning when a class shadows an |
| 1279 | // inaccessible package-private method from |
| 1280 | // its superclass. This warning is meant |
| 1281 | // to prevent people from relying on overriding |
| 1282 | // when it does not happen. This warning should |
| 1283 | // probably be removed to be consistent with the |
| 1284 | // general "no warnings" policy of this |
| 1285 | // compiler. |
| 1286 | // |
| 1287 | // The `instanceof' above is a hack so that only |
| 1288 | // SourceClass generates this warning, not a |
| 1289 | // BinaryClass, for example. |
| 1290 | env.error(method.getWhere(), |
| 1291 | "warn.no.override.access", |
| 1292 | override, |
| 1293 | override.getClassDeclaration(), |
| 1294 | method.getClassDeclaration()); |
| 1295 | } |
| 1296 | |
| 1297 | // If our superclass has a package-private abstract |
| 1298 | // method that we have no access to, then we add |
| 1299 | // this method to our list of permanently abstract |
| 1300 | // methods. The idea is, since we cannot override |
| 1301 | // the method, we can never make this class |
| 1302 | // non-abstract. |
| 1303 | if (method.isAbstract()) { |
| 1304 | permanentlyAbstractMethods.add(method); |
| 1305 | } |
| 1306 | |
| 1307 | // `method' is inaccessible. We do not inherit it. |
| 1308 | continue; |
| 1309 | } |
| 1310 | |
| 1311 | if (override != null) { |
| 1312 | // `method' and `override' have the same signature. |
| 1313 | // We are required to check that `override' is a |
| 1314 | // legal override of `method' |
| 1315 | |
| 1316 | //System.out.println ("About to check override of " + |
| 1317 | // method); |
| 1318 | |
| 1319 | override.checkOverride(env, method); |
| 1320 | } else { |
| 1321 | // In the absence of a definition in the class |
| 1322 | // itself, we check to see if this definition |
| 1323 | // can be successfully merged with any other |
| 1324 | // inherited definitions. |
| 1325 | |
| 1326 | // Have we added a member of the same signature |
| 1327 | // to `allMethods' already? |
| 1328 | MemberDefinition formerMethod = |
| 1329 | allMethods.lookupSig(name, type); |
| 1330 | |
| 1331 | // If the previous definition is nonexistent or |
| 1332 | // ignorable, replace it. |
| 1333 | if (formerMethod == null) { |
| 1334 | //System.out.println("Added " + method + " to " + |
| 1335 | // this); |
| 1336 | |
| 1337 | if (mirandaMethods != null && |
| 1338 | pClass.isInterface() && !isInterface()) { |
| 1339 | // Whenever a class inherits a method |
| 1340 | // from an interface, that method is |
| 1341 | // one of our "miranda" methods. Early |
| 1342 | // VMs require that these methods be |
| 1343 | // added as true members to the class |
| 1344 | // to enable method lookup to work in the |
| 1345 | // VM. |
| 1346 | method = |
| 1347 | new sun.tools.javac.SourceMember(method,this, |
| 1348 | env); |
| 1349 | mirandaMethods.add(method); |
| 1350 | |
| 1351 | //System.out.println("Added " + method + |
| 1352 | // " to " + this + " as a Miranda"); |
| 1353 | } |
| 1354 | |
| 1355 | // There is no previous inherited definition. |
| 1356 | // Add `method' to `allMethods'. |
| 1357 | allMethods.add(method); |
| 1358 | } else if (isInterface() && |
| 1359 | !formerMethod.isAbstract() && |
| 1360 | method.isAbstract()) { |
| 1361 | // If we are in an interface and we have inherited |
| 1362 | // both an abstract method and a non-abstract method |
| 1363 | // then we know that the non-abstract method is |
| 1364 | // a placeholder from Object put in for type checking |
| 1365 | // and the abstract method was already checked to |
| 1366 | // be proper by our superinterface. |
| 1367 | allMethods.replace(method); |
| 1368 | |
| 1369 | } else { |
| 1370 | // Okay, `formerMethod' and `method' both have the |
| 1371 | // same signature. See if they are compatible. |
| 1372 | |
| 1373 | //System.out.println ("About to check meet of " + |
| 1374 | // method); |
| 1375 | |
| 1376 | if (!formerMethod.checkMeet(env, |
| 1377 | method, |
| 1378 | this.getClassDeclaration())) { |
| 1379 | // The methods are incompatible. Skip to |
| 1380 | // next method. |
| 1381 | continue; |
| 1382 | } |
| 1383 | |
| 1384 | if (formerMethod.couldOverride(env, method)) { |
| 1385 | // Do nothing. The current definition |
| 1386 | // is specific enough. |
| 1387 | |
| 1388 | //System.out.println("trivial meet of " + |
| 1389 | // method); |
| 1390 | continue; |
| 1391 | } |
| 1392 | |
| 1393 | if (method.couldOverride(env, formerMethod)) { |
| 1394 | // `method' is more specific than |
| 1395 | // `formerMethod'. replace `formerMethod'. |
| 1396 | |
| 1397 | //System.out.println("new def of " + method); |
| 1398 | if (mirandaMethods != null && |
| 1399 | pClass.isInterface() && !isInterface()) { |
| 1400 | // Whenever a class inherits a method |
| 1401 | // from an interface, that method is |
| 1402 | // one of our "miranda" methods. Early |
| 1403 | // VMs require that these methods be |
| 1404 | // added as true members to the class |
| 1405 | // to enable method lookup to work in the |
| 1406 | // VM. |
| 1407 | method = |
| 1408 | new sun.tools.javac.SourceMember(method, |
| 1409 | this,env); |
| 1410 | |
| 1411 | mirandaMethods.replace(method); |
| 1412 | |
| 1413 | //System.out.println("Added " + method + |
| 1414 | // " to " + this + " as a Miranda"); |
| 1415 | } |
| 1416 | |
| 1417 | allMethods.replace(method); |
| 1418 | |
| 1419 | continue; |
| 1420 | } |
| 1421 | |
| 1422 | // Neither method is more specific than the other. |
| 1423 | // Oh well. We need to construct a nontrivial |
| 1424 | // meet of the two methods. |
| 1425 | // |
| 1426 | // This is not yet implemented, so we give |
| 1427 | // a message with a helpful workaround. |
| 1428 | env.error(this.where, |
| 1429 | "nontrivial.meet", method, |
| 1430 | formerMethod.getClassDefinition(), |
| 1431 | method.getClassDeclaration() |
| 1432 | ); |
| 1433 | } |
| 1434 | } |
| 1435 | } |
| 1436 | } catch (ClassNotFound ee) { |
| 1437 | env.error(getWhere(), "class.not.found", ee.name, this); |
| 1438 | } |
| 1439 | } |
| 1440 | |
| 1441 | /** |
| 1442 | * <p>Collect all methods defined in this class or inherited from |
| 1443 | * any of our superclasses or interfaces. Look for any |
| 1444 | * incompatible definitions. |
| 1445 | * |
| 1446 | * <p>This function is also responsible for collecting the |
| 1447 | * <em>Miranda</em> methods for a class. For a definition of |
| 1448 | * Miranda methods, see the comment in addMirandaMethods() |
| 1449 | * below. |
| 1450 | */ |
| 1451 | protected void collectInheritedMethods(Environment env) { |
| 1452 | // The methods defined in this class. |
| 1453 | MethodSet myMethods; |
| 1454 | MethodSet mirandaMethods; |
| 1455 | |
| 1456 | //System.out.println("Called collectInheritedMethods() for " + |
| 1457 | // this); |
| 1458 | |
| 1459 | if (allMethods != null) { |
| 1460 | if (allMethods.isFrozen()) { |
| 1461 | // We have already done the collection. No need to |
| 1462 | // do it again. |
| 1463 | return; |
| 1464 | } else { |
| 1465 | // We have run into a circular need to collect our methods. |
| 1466 | // This should not happen at this stage. |
| 1467 | throw new CompilerError("collectInheritedMethods()"); |
| 1468 | } |
| 1469 | } |
| 1470 | |
| 1471 | myMethods = new MethodSet(); |
| 1472 | allMethods = new MethodSet(); |
| 1473 | |
| 1474 | // For testing, do not generate miranda methods. |
| 1475 | if (env.version12()) { |
| 1476 | mirandaMethods = null; |
| 1477 | } else { |
| 1478 | mirandaMethods = new MethodSet(); |
| 1479 | } |
| 1480 | |
| 1481 | // Any methods defined in the current class get added |
| 1482 | // to both the myMethods and the allMethods MethodSets. |
| 1483 | |
| 1484 | for (MemberDefinition member = getFirstMember(); |
| 1485 | member != null; |
| 1486 | member = member.nextMember) { |
| 1487 | |
| 1488 | // We only collect methods. Initializers are not relevant. |
| 1489 | if (member.isMethod() && |
| 1490 | !member.isInitializer()) { |
| 1491 | |
| 1492 | //System.out.println("Declared in " + this + ", " + member); |
| 1493 | |
| 1494 | //////////////////////////////////////////////////////////// |
| 1495 | // PCJ 2003-07-30 modified the following code because with |
| 1496 | // the covariant return type feature of the 1.5 compiler, |
| 1497 | // there might be multiple methods with the same signature |
| 1498 | // but different return types, and MethodSet doesn't |
| 1499 | // support that. We use a new utility method that attempts |
| 1500 | // to ensure that the appropriate method winds up in the |
| 1501 | // MethodSet. See 4892308. |
| 1502 | //////////////////////////////////////////////////////////// |
| 1503 | // myMethods.add(member); |
| 1504 | // allMethods.add(member); |
| 1505 | //////////////////////////////////////////////////////////// |
| 1506 | methodSetAdd(env, myMethods, member); |
| 1507 | methodSetAdd(env, allMethods, member); |
| 1508 | //////////////////////////////////////////////////////////// |
| 1509 | } |
| 1510 | } |
| 1511 | |
| 1512 | // We're ready to start adding inherited methods. First add |
| 1513 | // the methods from our superclass. |
| 1514 | |
| 1515 | //System.out.println("About to start superclasses for " + this); |
| 1516 | |
| 1517 | ClassDeclaration scDecl = getSuperClass(env); |
| 1518 | if (scDecl != null) { |
| 1519 | collectOneClass(env, scDecl, |
| 1520 | myMethods, allMethods, mirandaMethods); |
| 1521 | |
| 1522 | // Make sure that we add all unimplementable methods from our |
| 1523 | // superclass to our list of unimplementable methods. |
| 1524 | ClassDefinition sc = scDecl.getClassDefinition(); |
| 1525 | Iterator supIter = sc.getPermanentlyAbstractMethods(); |
| 1526 | while (supIter.hasNext()) { |
| 1527 | permanentlyAbstractMethods.add(supIter.next()); |
| 1528 | } |
| 1529 | } |
| 1530 | |
| 1531 | // Now we inherit all of the methods from our interfaces. |
| 1532 | |
| 1533 | //System.out.println("About to start interfaces for " + this); |
| 1534 | |
| 1535 | for (int i = 0; i < interfaces.length; i++) { |
| 1536 | collectOneClass(env, interfaces[i], |
| 1537 | myMethods, allMethods, mirandaMethods); |
| 1538 | } |
| 1539 | allMethods.freeze(); |
| 1540 | |
| 1541 | // Now we have collected all of our methods from our superclasses |
| 1542 | // and interfaces into our `allMethods' member. Good. As a last |
| 1543 | // task, we add our collected miranda methods to this class. |
| 1544 | // |
| 1545 | // If we do not add the mirandas to the class explicitly, there |
| 1546 | // will be no code generated for them. |
| 1547 | if (mirandaMethods != null && mirandaMethods.size() > 0) { |
| 1548 | addMirandaMethods(env, mirandaMethods.iterator()); |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | //////////////////////////////////////////////////////////// |
| 1553 | // PCJ 2003-07-30 added this utility method to insulate |
| 1554 | // MethodSet additions from the covariant return type |
| 1555 | // feature of the 1.5 compiler. When there are multiple |
| 1556 | // methods with the same signature and different return |
| 1557 | // types to be added, we try to ensure that the one with |
| 1558 | // the most specific return type winds up in the MethodSet. |
| 1559 | // This logic was not put into MethodSet itself because it |
| 1560 | // requires access to an Environment for type relationship |
| 1561 | // checking. No error checking is performed here, but that |
| 1562 | // should be OK because this code is only still used by |
| 1563 | // rmic. See 4892308. |
| 1564 | //////////////////////////////////////////////////////////// |
| 1565 | private static void methodSetAdd(Environment env, |
| 1566 | MethodSet methodSet, |
| 1567 | MemberDefinition newMethod) |
| 1568 | { |
| 1569 | MemberDefinition oldMethod = methodSet.lookupSig(newMethod.getName(), |
| 1570 | newMethod.getType()); |
| 1571 | if (oldMethod != null) { |
| 1572 | Type oldReturnType = oldMethod.getType().getReturnType(); |
| 1573 | Type newReturnType = newMethod.getType().getReturnType(); |
| 1574 | try { |
| 1575 | if (env.isMoreSpecific(newReturnType, oldReturnType)) { |
| 1576 | methodSet.replace(newMethod); |
| 1577 | } |
| 1578 | } catch (ClassNotFound ignore) { |
| 1579 | } |
| 1580 | } else { |
| 1581 | methodSet.add(newMethod); |
| 1582 | } |
| 1583 | } |
| 1584 | //////////////////////////////////////////////////////////// |
| 1585 | |
| 1586 | /** |
| 1587 | * Get an Iterator of all methods which could be accessed in an |
| 1588 | * instance of this class. |
| 1589 | */ |
| 1590 | public Iterator getMethods(Environment env) { |
| 1591 | if (allMethods == null) { |
| 1592 | collectInheritedMethods(env); |
| 1593 | } |
| 1594 | return getMethods(); |
| 1595 | } |
| 1596 | |
| 1597 | /** |
| 1598 | * Get an Iterator of all methods which could be accessed in an |
| 1599 | * instance of this class. Throw a compiler error if we haven't |
| 1600 | * generated this information yet. |
| 1601 | */ |
| 1602 | public Iterator getMethods() { |
| 1603 | if (allMethods == null) { |
| 1604 | throw new CompilerError("getMethods: too early"); |
| 1605 | } |
| 1606 | return allMethods.iterator(); |
| 1607 | } |
| 1608 | |
| 1609 | // In early VM's there was a bug -- the VM didn't walk the interfaces |
| 1610 | // of a class looking for a method, they only walked the superclass |
| 1611 | // chain. This meant that abstract methods defined only in interfaces |
| 1612 | // were not being found. To fix this bug, a counter-bug was introduced |
| 1613 | // in the compiler -- the so-called Miranda methods. If a class |
| 1614 | // does not provide a definition for an abstract method in one of |
| 1615 | // its interfaces then the compiler inserts one in the class artificially. |
| 1616 | // That way the VM didn't have to bother looking at the interfaces. |
| 1617 | // |
| 1618 | // This is a problem. Miranda methods are not part of the specification. |
| 1619 | // But they continue to be inserted so that old VM's can run new code. |
| 1620 | // Someday, when the old VM's are gone, perhaps classes can be compiled |
| 1621 | // without Miranda methods. Towards this end, the compiler has a |
| 1622 | // flag, -nomiranda, which can turn off the creation of these methods. |
| 1623 | // Eventually that behavior should become the default. |
| 1624 | // |
| 1625 | // Why are they called Miranda methods? Well the sentence "If the |
| 1626 | // class is not able to provide a method, then one will be provided |
| 1627 | // by the compiler" is very similar to the sentence "If you cannot |
| 1628 | // afford an attorney, one will be provided by the court," -- one |
| 1629 | // of the so-called "Miranda" rights in the United States. |
| 1630 | |
| 1631 | /** |
| 1632 | * Add a list of methods to this class as miranda methods. This |
| 1633 | * gets overridden with a meaningful implementation in SourceClass. |
| 1634 | * BinaryClass should not need to do anything -- it should already |
| 1635 | * have its miranda methods and, if it doesn't, then that doesn't |
| 1636 | * affect our compilation. |
| 1637 | */ |
| 1638 | protected void addMirandaMethods(Environment env, |
| 1639 | Iterator mirandas) { |
| 1640 | // do nothing. |
| 1641 | } |
| 1642 | |
| 1643 | //--------------------------------------------------------------- |
| 1644 | |
| 1645 | public void inlineLocalClass(Environment env) { |
| 1646 | } |
| 1647 | |
| 1648 | /** |
| 1649 | * We create a stub for this. Source classes do more work. |
| 1650 | * Some calls from 'SourceClass.checkSupers' execute this method. |
| 1651 | * @see sun.tools.javac.SourceClass#resolveTypeStructure |
| 1652 | */ |
| 1653 | |
| 1654 | public void resolveTypeStructure(Environment env) { |
| 1655 | } |
| 1656 | |
| 1657 | /** |
| 1658 | * Look up an inner class name, from somewhere inside this class. |
| 1659 | * Since supers and outers are in scope, search them too. |
| 1660 | * <p> |
| 1661 | * If no inner class is found, env.resolveName() is then called, |
| 1662 | * to interpret the ambient package and import directives. |
| 1663 | * <p> |
| 1664 | * This routine operates on a "best-efforts" basis. If |
| 1665 | * at some point a class is not found, the partially-resolved |
| 1666 | * identifier is returned. Eventually, someone else has to |
| 1667 | * try to get the ClassDefinition and diagnose the ClassNotFound. |
| 1668 | * <p> |
| 1669 | * resolveName() looks at surrounding scopes, and hence |
| 1670 | * pulling in both inherited and uplevel types. By contrast, |
| 1671 | * resolveInnerClass() is intended only for interpreting |
| 1672 | * explicitly qualified names, and so look only at inherited |
| 1673 | * types. Also, resolveName() looks for package prefixes, |
| 1674 | * which appear similar to "very uplevel" outer classes. |
| 1675 | * <p> |
| 1676 | * A similar (but more complex) name-lookup process happens |
| 1677 | * when field and identifier expressions denoting qualified names |
| 1678 | * are type-checked. The added complexity comes from the fact |
| 1679 | * that variables may occur in such names, and take precedence |
| 1680 | * over class and package names. |
| 1681 | * <p> |
| 1682 | * In the expression type-checker, resolveInnerClass() is paralleled |
| 1683 | * by code in FieldExpression.checkAmbigName(), which also calls |
| 1684 | * ClassDefinition.getInnerClass() to interpret names of the form |
| 1685 | * "OuterClass.Inner" (and also outerObject.Inner). The checking |
| 1686 | * of an identifier expression that fails to be a variable is referred |
| 1687 | * directly to resolveName(). |
| 1688 | */ |
| 1689 | public Identifier resolveName(Environment env, Identifier name) { |
| 1690 | if (tracing) env.dtEvent("ClassDefinition.resolveName: " + name); |
| 1691 | // This logic is pretty much exactly parallel to that of |
| 1692 | // Environment.resolveName(). |
| 1693 | if (name.isQualified()) { |
| 1694 | // Try to resolve the first identifier component, |
| 1695 | // because inner class names take precedence over |
| 1696 | // package prefixes. (Cf. Environment.resolveName.) |
| 1697 | Identifier rhead = resolveName(env, name.getHead()); |
| 1698 | |
| 1699 | if (rhead.hasAmbigPrefix()) { |
| 1700 | // The first identifier component refers to an |
| 1701 | // ambiguous class. Limp on. We throw away the |
| 1702 | // rest of the classname as it is irrelevant. |
| 1703 | // (part of solution for 4059855). |
| 1704 | return rhead; |
| 1705 | } |
| 1706 | |
| 1707 | if (!env.classExists(rhead)) { |
| 1708 | return env.resolvePackageQualifiedName(name); |
| 1709 | } |
| 1710 | try { |
| 1711 | return env.getClassDefinition(rhead). |
| 1712 | resolveInnerClass(env, name.getTail()); |
| 1713 | } catch (ClassNotFound ee) { |
| 1714 | // return partially-resolved name someone else can fail on |
| 1715 | return Identifier.lookupInner(rhead, name.getTail()); |
| 1716 | } |
| 1717 | } |
| 1718 | |
| 1719 | // This method used to fail to look for local classes, thus a |
| 1720 | // reference to a local class within, e.g., the type of a member |
| 1721 | // declaration, would fail to resolve if the immediately enclosing |
| 1722 | // context was an inner class. The code added below is ugly, but |
| 1723 | // it works, and is lifted from existing code in 'Context.resolveName' |
| 1724 | // and 'Context.getClassCommon'. See the comments there about the design. |
| 1725 | // Fixes 4095716. |
| 1726 | |
| 1727 | int ls = -2; |
| 1728 | LocalMember lf = null; |
| 1729 | if (classContext != null) { |
| 1730 | lf = classContext.getLocalClass(name); |
| 1731 | if (lf != null) { |
| 1732 | ls = lf.getScopeNumber(); |
| 1733 | } |
| 1734 | } |
| 1735 | |
| 1736 | // Look for an unqualified name in enclosing scopes. |
| 1737 | for (ClassDefinition c = this; c != null; c = c.outerClass) { |
| 1738 | try { |
| 1739 | MemberDefinition f = c.getInnerClass(env, name); |
| 1740 | if (f != null && |
| 1741 | (lf == null || classContext.getScopeNumber(c) > ls)) { |
| 1742 | // An uplevel member was found, and was nested more deeply than |
| 1743 | // any enclosing local of the same name. |
| 1744 | return f.getInnerClass().getName(); |
| 1745 | } |
| 1746 | } catch (ClassNotFound ee) { |
| 1747 | // a missing superclass, or something catastrophic |
| 1748 | } |
| 1749 | } |
| 1750 | |
| 1751 | // No uplevel member found, so use the enclosing local if one was found. |
| 1752 | if (lf != null) { |
| 1753 | return lf.getInnerClass().getName(); |
| 1754 | } |
| 1755 | |
| 1756 | // look in imports, etc. |
| 1757 | return env.resolveName(name); |
| 1758 | } |
| 1759 | |
| 1760 | /** |
| 1761 | * Interpret a qualified class name, which may have further subcomponents.. |
| 1762 | * Follow inheritance links, as in: |
| 1763 | * class C { class N { } } class D extends C { } ... new D.N() ... |
| 1764 | * Ignore outer scopes and packages. |
| 1765 | * @see resolveName |
| 1766 | */ |
| 1767 | public Identifier resolveInnerClass(Environment env, Identifier nm) { |
| 1768 | if (nm.isInner()) throw new CompilerError("inner"); |
| 1769 | if (nm.isQualified()) { |
| 1770 | Identifier rhead = resolveInnerClass(env, nm.getHead()); |
| 1771 | try { |
| 1772 | return env.getClassDefinition(rhead). |
| 1773 | resolveInnerClass(env, nm.getTail()); |
| 1774 | } catch (ClassNotFound ee) { |
| 1775 | // return partially-resolved name someone else can fail on |
| 1776 | return Identifier.lookupInner(rhead, nm.getTail()); |
| 1777 | } |
| 1778 | } else { |
| 1779 | try { |
| 1780 | MemberDefinition f = getInnerClass(env, nm); |
| 1781 | if (f != null) { |
| 1782 | return f.getInnerClass().getName(); |
| 1783 | } |
| 1784 | } catch (ClassNotFound ee) { |
| 1785 | // a missing superclass, or something catastrophic |
| 1786 | } |
| 1787 | // Fake a good name for a diagnostic. |
| 1788 | return Identifier.lookupInner(this.getName(), nm); |
| 1789 | } |
| 1790 | } |
| 1791 | |
| 1792 | /** |
| 1793 | * While resolving import directives, the question has arisen: |
| 1794 | * does a given inner class exist? If the top-level class exists, |
| 1795 | * we ask it about an inner class via this method. |
| 1796 | * This method looks only at the literal name of the class, |
| 1797 | * and does not attempt to follow inheritance links. |
| 1798 | * This is necessary, since at the time imports are being |
| 1799 | * processed, inheritance links have not been resolved yet. |
| 1800 | * (Thus, an import directive must always spell a class |
| 1801 | * name exactly.) |
| 1802 | */ |
| 1803 | public boolean innerClassExists(Identifier nm) { |
| 1804 | for (MemberDefinition field = getFirstMatch(nm.getHead()) ; field != null ; field = field.getNextMatch()) { |
| 1805 | if (field.isInnerClass()) { |
| 1806 | if (field.getInnerClass().isLocal()) { |
| 1807 | continue; // ignore this name; it is internally generated |
| 1808 | } |
| 1809 | return !nm.isQualified() || |
| 1810 | field.getInnerClass().innerClassExists(nm.getTail()); |
| 1811 | } |
| 1812 | } |
| 1813 | return false; |
| 1814 | } |
| 1815 | |
| 1816 | /** |
| 1817 | * Find any method with a given name. |
| 1818 | */ |
| 1819 | public MemberDefinition findAnyMethod(Environment env, Identifier nm) throws ClassNotFound { |
| 1820 | MemberDefinition f; |
| 1821 | for (f = getFirstMatch(nm) ; f != null ; f = f.getNextMatch()) { |
| 1822 | if (f.isMethod()) { |
| 1823 | return f; |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | // look in the super class |
| 1828 | ClassDeclaration sup = getSuperClass(); |
| 1829 | if (sup == null) |
| 1830 | return null; |
| 1831 | return sup.getClassDefinition(env).findAnyMethod(env, nm); |
| 1832 | } |
| 1833 | |
| 1834 | /** |
| 1835 | * Given the fact that this class has no method "nm" matching "argTypes", |
| 1836 | * find out if the mismatch can be blamed on a particular actual argument |
| 1837 | * which disagrees with all of the overloadings. |
| 1838 | * If so, return the code (i<<2)+(castOK<<1)+ambig, where |
| 1839 | * "i" is the number of the offending argument, and |
| 1840 | * "castOK" is 1 if a cast could fix the problem. |
| 1841 | * The target type for the argument is returned in margTypeResult[0]. |
| 1842 | * If not all methods agree on this type, "ambig" is 1. |
| 1843 | * If there is more than one method, the choice of target type is |
| 1844 | * arbitrary.<p> |
| 1845 | * Return -1 if every argument is acceptable to at least one method. |
| 1846 | * Return -2 if there are no methods of the required arity. |
| 1847 | * The value "start" gives the index of the first argument to begin |
| 1848 | * checking. |
| 1849 | */ |
| 1850 | public int diagnoseMismatch(Environment env, Identifier nm, Type argTypes[], |
| 1851 | int start, Type margTypeResult[]) throws ClassNotFound { |
| 1852 | int haveMatch[] = new int[argTypes.length]; |
| 1853 | Type margType[] = new Type[argTypes.length]; |
| 1854 | if (!diagnoseMismatch(env, nm, argTypes, start, haveMatch, margType)) |
| 1855 | return -2; |
| 1856 | for (int i = start; i < argTypes.length; i++) { |
| 1857 | if (haveMatch[i] < 4) { |
| 1858 | margTypeResult[0] = margType[i]; |
| 1859 | return (i<<2) | haveMatch[i]; |
| 1860 | } |
| 1861 | } |
| 1862 | return -1; |
| 1863 | } |
| 1864 | |
| 1865 | private boolean diagnoseMismatch(Environment env, Identifier nm, Type argTypes[], int start, |
| 1866 | int haveMatch[], Type margType[]) throws ClassNotFound { |
| 1867 | // look in the current class |
| 1868 | boolean haveOne = false; |
| 1869 | MemberDefinition f; |
| 1870 | for (f = getFirstMatch(nm) ; f != null ; f = f.getNextMatch()) { |
| 1871 | if (!f.isMethod()) { |
| 1872 | continue; |
| 1873 | } |
| 1874 | Type fArgTypes[] = f.getType().getArgumentTypes(); |
| 1875 | if (fArgTypes.length == argTypes.length) { |
| 1876 | haveOne = true; |
| 1877 | for (int i = start; i < argTypes.length; i++) { |
| 1878 | Type at = argTypes[i]; |
| 1879 | Type ft = fArgTypes[i]; |
| 1880 | if (env.implicitCast(at, ft)) { |
| 1881 | haveMatch[i] = 4; |
| 1882 | continue; |
| 1883 | } else if (haveMatch[i] <= 2 && env.explicitCast(at, ft)) { |
| 1884 | if (haveMatch[i] < 2) margType[i] = null; |
| 1885 | haveMatch[i] = 2; |
| 1886 | } else if (haveMatch[i] > 0) { |
| 1887 | continue; |
| 1888 | } |
| 1889 | if (margType[i] == null) |
| 1890 | margType[i] = ft; |
| 1891 | else if (margType[i] != ft) |
| 1892 | haveMatch[i] |= 1; |
| 1893 | } |
| 1894 | } |
| 1895 | } |
| 1896 | |
| 1897 | // constructors are not inherited |
| 1898 | if (nm.equals(idInit)) { |
| 1899 | return haveOne; |
| 1900 | } |
| 1901 | |
| 1902 | // look in the super class |
| 1903 | ClassDeclaration sup = getSuperClass(); |
| 1904 | if (sup != null) { |
| 1905 | if (sup.getClassDefinition(env).diagnoseMismatch(env, nm, argTypes, start, |
| 1906 | haveMatch, margType)) |
| 1907 | haveOne = true; |
| 1908 | } |
| 1909 | return haveOne; |
| 1910 | } |
| 1911 | |
| 1912 | /** |
| 1913 | * Add a field (no checks) |
| 1914 | */ |
| 1915 | public void addMember(MemberDefinition field) { |
| 1916 | //System.out.println("ADD = " + field); |
| 1917 | if (firstMember == null) { |
| 1918 | firstMember = lastMember = field; |
| 1919 | } else if (field.isSynthetic() && field.isFinal() |
| 1920 | && field.isVariable()) { |
| 1921 | // insert this at the front, because of initialization order |
| 1922 | field.nextMember = firstMember; |
| 1923 | firstMember = field; |
| 1924 | field.nextMatch = (MemberDefinition)fieldHash.get(field.name); |
| 1925 | } else { |
| 1926 | lastMember.nextMember = field; |
| 1927 | lastMember = field; |
| 1928 | field.nextMatch = (MemberDefinition)fieldHash.get(field.name); |
| 1929 | } |
| 1930 | fieldHash.put(field.name, field); |
| 1931 | } |
| 1932 | |
| 1933 | /** |
| 1934 | * Add a field (subclasses make checks) |
| 1935 | */ |
| 1936 | public void addMember(Environment env, MemberDefinition field) { |
| 1937 | addMember(field); |
| 1938 | if (resolved) { |
| 1939 | // a late addition |
| 1940 | field.resolveTypeStructure(env); |
| 1941 | } |
| 1942 | } |
| 1943 | |
| 1944 | /** |
| 1945 | * Find or create an uplevel reference for the given target. |
| 1946 | */ |
| 1947 | public UplevelReference getReference(LocalMember target) { |
| 1948 | for (UplevelReference r = references; r != null; r = r.getNext()) { |
| 1949 | if (r.getTarget() == target) { |
| 1950 | return r; |
| 1951 | } |
| 1952 | } |
| 1953 | return addReference(target); |
| 1954 | } |
| 1955 | |
| 1956 | protected UplevelReference addReference(LocalMember target) { |
| 1957 | if (target.getClassDefinition() == this) { |
| 1958 | throw new CompilerError("addReference "+target); |
| 1959 | } |
| 1960 | referencesMustNotBeFrozen(); |
| 1961 | UplevelReference r = new UplevelReference(this, target); |
| 1962 | references = r.insertInto(references); |
| 1963 | return r; |
| 1964 | } |
| 1965 | |
| 1966 | /** |
| 1967 | * Return the list of all uplevel references. |
| 1968 | */ |
| 1969 | public UplevelReference getReferences() { |
| 1970 | return references; |
| 1971 | } |
| 1972 | |
| 1973 | /** |
| 1974 | * Return the same value as getReferences. |
| 1975 | * Also, mark the set of references frozen. |
| 1976 | * After that, it is an error to add new references. |
| 1977 | */ |
| 1978 | public UplevelReference getReferencesFrozen() { |
| 1979 | referencesFrozen = true; |
| 1980 | return references; |
| 1981 | } |
| 1982 | |
| 1983 | /** |
| 1984 | * assertion check |
| 1985 | */ |
| 1986 | public final void referencesMustNotBeFrozen() { |
| 1987 | if (referencesFrozen) { |
| 1988 | throw new CompilerError("referencesMustNotBeFrozen "+this); |
| 1989 | } |
| 1990 | } |
| 1991 | |
| 1992 | /** |
| 1993 | * Get helper method for class literal lookup. |
| 1994 | */ |
| 1995 | public MemberDefinition getClassLiteralLookup(long fwhere) { |
| 1996 | throw new CompilerError("binary class"); |
| 1997 | } |
| 1998 | |
| 1999 | /** |
| 2000 | * Add a dependency |
| 2001 | */ |
| 2002 | public void addDependency(ClassDeclaration c) { |
| 2003 | throw new CompilerError("addDependency"); |
| 2004 | } |
| 2005 | |
| 2006 | /** |
| 2007 | * Maintain a hash table of local and anonymous classes |
| 2008 | * whose internal names are prefixed by the current class. |
| 2009 | * The key is the simple internal name, less the prefix. |
| 2010 | */ |
| 2011 | |
| 2012 | public ClassDefinition getLocalClass(String name) { |
| 2013 | if (localClasses == null) { |
| 2014 | return null; |
| 2015 | } else { |
| 2016 | return (ClassDefinition)localClasses.get(name); |
| 2017 | } |
| 2018 | } |
| 2019 | |
| 2020 | public void addLocalClass(ClassDefinition c, String name) { |
| 2021 | if (localClasses == null) { |
| 2022 | localClasses = new Hashtable(LOCAL_CLASSES_SIZE); |
| 2023 | } |
| 2024 | localClasses.put(name, c); |
| 2025 | } |
| 2026 | |
| 2027 | |
| 2028 | /** |
| 2029 | * Print for debugging |
| 2030 | */ |
| 2031 | public void print(PrintStream out) { |
| 2032 | if (isPublic()) { |
| 2033 | out.print("public "); |
| 2034 | } |
| 2035 | if (isInterface()) { |
| 2036 | out.print("interface "); |
| 2037 | } else { |
| 2038 | out.print("class "); |
| 2039 | } |
| 2040 | out.print(getName() + " "); |
| 2041 | if (getSuperClass() != null) { |
| 2042 | out.print("extends " + getSuperClass().getName() + " "); |
| 2043 | } |
| 2044 | if (interfaces.length > 0) { |
| 2045 | out.print("implements "); |
| 2046 | for (int i = 0 ; i < interfaces.length ; i++) { |
| 2047 | if (i > 0) { |
| 2048 | out.print(", "); |
| 2049 | } |
| 2050 | out.print(interfaces[i].getName()); |
| 2051 | out.print(" "); |
| 2052 | } |
| 2053 | } |
| 2054 | out.println("{"); |
| 2055 | |
| 2056 | for (MemberDefinition f = getFirstMember() ; f != null ; f = f.getNextMember()) { |
| 2057 | out.print(" "); |
| 2058 | f.print(out); |
| 2059 | } |
| 2060 | |
| 2061 | out.println("}"); |
| 2062 | } |
| 2063 | |
| 2064 | /** |
| 2065 | * Convert to String |
| 2066 | */ |
| 2067 | public String toString() { |
| 2068 | return getClassDeclaration().toString(); |
| 2069 | } |
| 2070 | |
| 2071 | /** |
| 2072 | * After the class has been written to disk, try to free up |
| 2073 | * some storage. |
| 2074 | */ |
| 2075 | public void cleanup(Environment env) { |
| 2076 | if (env.dump()) { |
| 2077 | env.output("[cleanup " + getName() + "]"); |
| 2078 | } |
| 2079 | for (MemberDefinition f = getFirstMember() ; f != null ; f = f.getNextMember()) { |
| 2080 | f.cleanup(env); |
| 2081 | } |
| 2082 | // keep "references" around, for the sake of local subclasses |
| 2083 | documentation = null; |
| 2084 | } |
| 2085 | } |