TypeEnter.java revision 3043:4914b013c305
1/* 2 * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.HashSet; 29import java.util.Set; 30import java.util.function.BiConsumer; 31 32import javax.tools.JavaFileObject; 33 34import com.sun.tools.javac.code.*; 35import com.sun.tools.javac.code.Lint.LintCategory; 36import com.sun.tools.javac.code.Scope.ImportFilter; 37import com.sun.tools.javac.code.Scope.NamedImportScope; 38import com.sun.tools.javac.code.Scope.StarImportScope; 39import com.sun.tools.javac.code.Scope.WriteableScope; 40import com.sun.tools.javac.comp.Annotate.AnnotationTypeMetadata; 41import com.sun.tools.javac.tree.*; 42import com.sun.tools.javac.util.*; 43import com.sun.tools.javac.util.DefinedBy.Api; 44 45import com.sun.tools.javac.code.Symbol.*; 46import com.sun.tools.javac.code.Type.*; 47import com.sun.tools.javac.tree.JCTree.*; 48 49import static com.sun.tools.javac.code.Flags.*; 50import static com.sun.tools.javac.code.Flags.ANNOTATION; 51import static com.sun.tools.javac.code.Scope.LookupKind.NON_RECURSIVE; 52import static com.sun.tools.javac.code.Kinds.Kind.*; 53import static com.sun.tools.javac.code.TypeTag.CLASS; 54import static com.sun.tools.javac.code.TypeTag.ERROR; 55import static com.sun.tools.javac.tree.JCTree.Tag.*; 56 57import com.sun.tools.javac.util.Dependencies.AttributionKind; 58import com.sun.tools.javac.util.Dependencies.CompletionCause; 59import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 60import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 61 62/** This is the second phase of Enter, in which classes are completed 63 * by resolving their headers and entering their members in the into 64 * the class scope. See Enter for an overall overview. 65 * 66 * This class uses internal phases to process the classes. When a phase 67 * processes classes, the lower phases are not invoked until all classes 68 * pass through the current phase. Note that it is possible that upper phases 69 * are run due to recursive completion. The internal phases are: 70 * - ImportPhase: shallow pass through imports, adds information about imports 71 * the NamedImportScope and StarImportScope, but avoids queries 72 * about class hierarchy. 73 * - HierarchyPhase: resolves the supertypes of the given class. Does not handle 74 * type parameters of the class or type argument of the supertypes. 75 * - HeaderPhase: finishes analysis of the header of the given class by resolving 76 * type parameters, attributing supertypes including type arguments 77 * and scheduling full annotation attribution. This phase also adds 78 * a synthetic default constructor if needed and synthetic "this" field. 79 * - MembersPhase: resolves headers for fields, methods and constructors in the given class. 80 * Also generates synthetic enum members. 81 * 82 * <p><b>This is NOT part of any supported API. 83 * If you write code that depends on this, you do so at your own risk. 84 * This code and its internal interfaces are subject to change or 85 * deletion without notice.</b> 86 */ 87public class TypeEnter implements Completer { 88 protected static final Context.Key<TypeEnter> typeEnterKey = new Context.Key<>(); 89 90 /** A switch to determine whether we check for package/class conflicts 91 */ 92 final static boolean checkClash = true; 93 94 private final Names names; 95 private final Enter enter; 96 private final MemberEnter memberEnter; 97 private final Log log; 98 private final Check chk; 99 private final Attr attr; 100 private final Symtab syms; 101 private final TreeMaker make; 102 private final Todo todo; 103 private final Annotate annotate; 104 private final TypeAnnotations typeAnnotations; 105 private final Types types; 106 private final JCDiagnostic.Factory diags; 107 private final Source source; 108 private final DeferredLintHandler deferredLintHandler; 109 private final Lint lint; 110 private final TypeEnvs typeEnvs; 111 private final Dependencies dependencies; 112 113 public static TypeEnter instance(Context context) { 114 TypeEnter instance = context.get(typeEnterKey); 115 if (instance == null) 116 instance = new TypeEnter(context); 117 return instance; 118 } 119 120 protected TypeEnter(Context context) { 121 context.put(typeEnterKey, this); 122 names = Names.instance(context); 123 enter = Enter.instance(context); 124 memberEnter = MemberEnter.instance(context); 125 log = Log.instance(context); 126 chk = Check.instance(context); 127 attr = Attr.instance(context); 128 syms = Symtab.instance(context); 129 make = TreeMaker.instance(context); 130 todo = Todo.instance(context); 131 annotate = Annotate.instance(context); 132 typeAnnotations = TypeAnnotations.instance(context); 133 types = Types.instance(context); 134 diags = JCDiagnostic.Factory.instance(context); 135 source = Source.instance(context); 136 deferredLintHandler = DeferredLintHandler.instance(context); 137 lint = Lint.instance(context); 138 typeEnvs = TypeEnvs.instance(context); 139 dependencies = Dependencies.instance(context); 140 Source source = Source.instance(context); 141 allowTypeAnnos = source.allowTypeAnnotations(); 142 allowDeprecationOnImport = source.allowDeprecationOnImport(); 143 } 144 145 /** Switch: support type annotations. 146 */ 147 boolean allowTypeAnnos; 148 149 /** 150 * Switch: should deprecation warnings be issued on import 151 */ 152 boolean allowDeprecationOnImport; 153 154 /** A flag to disable completion from time to time during member 155 * enter, as we only need to look up types. This avoids 156 * unnecessarily deep recursion. 157 */ 158 boolean completionEnabled = true; 159 160 /* Verify Imports: 161 */ 162 protected void ensureImportsChecked(List<JCCompilationUnit> trees) { 163 // if there remain any unimported toplevels (these must have 164 // no classes at all), process their import statements as well. 165 for (JCCompilationUnit tree : trees) { 166 if (!tree.starImportScope.isFilled()) { 167 Env<AttrContext> topEnv = enter.topLevelEnv(tree); 168 finishImports(tree, () -> { completeClass.resolveImports(tree, topEnv); }); 169 } 170 } 171 } 172 173/* ******************************************************************** 174 * Source completer 175 *********************************************************************/ 176 177 /** Complete entering a class. 178 * @param sym The symbol of the class to be completed. 179 */ 180 public void complete(Symbol sym) throws CompletionFailure { 181 // Suppress some (recursive) MemberEnter invocations 182 if (!completionEnabled) { 183 // Re-install same completer for next time around and return. 184 Assert.check((sym.flags() & Flags.COMPOUND) == 0); 185 sym.completer = this; 186 return; 187 } 188 189 try { 190 annotate.blockAnnotations(); 191 sym.flags_field |= UNATTRIBUTED; 192 193 List<Env<AttrContext>> queue; 194 195 dependencies.push((ClassSymbol) sym, CompletionCause.MEMBER_ENTER); 196 try { 197 queue = completeClass.completeEnvs(List.of(typeEnvs.get((ClassSymbol) sym))); 198 } finally { 199 dependencies.pop(); 200 } 201 202 if (!queue.isEmpty()) { 203 Set<JCCompilationUnit> seen = new HashSet<>(); 204 205 for (Env<AttrContext> env : queue) { 206 if (env.toplevel.defs.contains(env.enclClass) && seen.add(env.toplevel)) { 207 finishImports(env.toplevel, () -> {}); 208 } 209 } 210 } 211 } finally { 212 annotate.unblockAnnotations(); 213 } 214 } 215 216 void finishImports(JCCompilationUnit toplevel, Runnable resolve) { 217 JavaFileObject prev = log.useSource(toplevel.sourcefile); 218 try { 219 resolve.run(); 220 chk.checkImportsUnique(toplevel); 221 chk.checkImportsResolvable(toplevel); 222 chk.checkImportedPackagesObservable(toplevel); 223 toplevel.namedImportScope.finalizeScope(); 224 toplevel.starImportScope.finalizeScope(); 225 } finally { 226 log.useSource(prev); 227 } 228 } 229 230 abstract class Phase { 231 private final ListBuffer<Env<AttrContext>> queue = new ListBuffer<>(); 232 private final Phase next; 233 private final CompletionCause phaseName; 234 235 Phase(CompletionCause phaseName, Phase next) { 236 this.phaseName = phaseName; 237 this.next = next; 238 } 239 240 public final List<Env<AttrContext>> completeEnvs(List<Env<AttrContext>> envs) { 241 boolean firstToComplete = queue.isEmpty(); 242 243 doCompleteEnvs(envs); 244 245 if (firstToComplete) { 246 List<Env<AttrContext>> out = queue.toList(); 247 248 queue.clear(); 249 return next != null ? next.completeEnvs(out) : out; 250 } else { 251 return List.nil(); 252 } 253 } 254 255 protected void doCompleteEnvs(List<Env<AttrContext>> envs) { 256 for (Env<AttrContext> env : envs) { 257 JCClassDecl tree = (JCClassDecl)env.tree; 258 259 queue.add(env); 260 261 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 262 DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos()); 263 try { 264 dependencies.push(env.enclClass.sym, phaseName); 265 runPhase(env); 266 } catch (CompletionFailure ex) { 267 chk.completionError(tree.pos(), ex); 268 } finally { 269 dependencies.pop(); 270 deferredLintHandler.setPos(prevLintPos); 271 log.useSource(prev); 272 } 273 } 274 } 275 276 protected abstract void runPhase(Env<AttrContext> env); 277 } 278 279 private final ImportsPhase completeClass = new ImportsPhase(); 280 281 /**Analyze import clauses. 282 */ 283 private final class ImportsPhase extends Phase { 284 285 public ImportsPhase() { 286 super(CompletionCause.IMPORTS_PHASE, new HierarchyPhase()); 287 } 288 289 Env<AttrContext> env; 290 ImportFilter staticImportFilter; 291 ImportFilter typeImportFilter; 292 BiConsumer<JCImport, CompletionFailure> cfHandler = 293 (imp, cf) -> chk.completionError(imp.pos(), cf); 294 295 @Override 296 protected void runPhase(Env<AttrContext> env) { 297 JCClassDecl tree = env.enclClass; 298 ClassSymbol sym = tree.sym; 299 300 // If sym is a toplevel-class, make sure any import 301 // clauses in its source file have been seen. 302 if (sym.owner.kind == PCK) { 303 resolveImports(env.toplevel, env.enclosing(TOPLEVEL)); 304 todo.append(env); 305 } 306 307 if (sym.owner.kind == TYP) 308 sym.owner.complete(); 309 } 310 311 private void resolveImports(JCCompilationUnit tree, Env<AttrContext> env) { 312 if (tree.starImportScope.isFilled()) { 313 // we must have already processed this toplevel 314 return; 315 } 316 317 ImportFilter prevStaticImportFilter = staticImportFilter; 318 ImportFilter prevTypeImportFilter = typeImportFilter; 319 DiagnosticPosition prevLintPos = deferredLintHandler.immediate(); 320 Lint prevLint = chk.setLint(lint); 321 Env<AttrContext> prevEnv = this.env; 322 try { 323 this.env = env; 324 final PackageSymbol packge = env.toplevel.packge; 325 this.staticImportFilter = 326 (origin, sym) -> sym.isStatic() && 327 chk.importAccessible(sym, packge) && 328 sym.isMemberOf((TypeSymbol) origin.owner, types); 329 this.typeImportFilter = 330 (origin, sym) -> sym.kind == TYP && 331 chk.importAccessible(sym, packge); 332 333 // Import-on-demand java.lang. 334 PackageSymbol javaLang = syms.enterPackage(names.java_lang); 335 if (javaLang.members().isEmpty() && !javaLang.exists()) 336 throw new FatalError(diags.fragment("fatal.err.no.java.lang")); 337 importAll(make.at(tree.pos()).Import(make.QualIdent(javaLang), false), javaLang, env); 338 339 // Process the package def and all import clauses. 340 if (tree.getPackage() != null) 341 checkClassPackageClash(tree.getPackage()); 342 343 for (JCImport imp : tree.getImports()) { 344 doImport(imp); 345 } 346 } finally { 347 this.env = prevEnv; 348 chk.setLint(prevLint); 349 deferredLintHandler.setPos(prevLintPos); 350 this.staticImportFilter = prevStaticImportFilter; 351 this.typeImportFilter = prevTypeImportFilter; 352 } 353 } 354 355 private void checkClassPackageClash(JCPackageDecl tree) { 356 // check that no class exists with same fully qualified name as 357 // toplevel package 358 if (checkClash && tree.pid != null) { 359 Symbol p = env.toplevel.packge; 360 while (p.owner != syms.rootPackage) { 361 p.owner.complete(); // enter all class members of p 362 if (syms.classes.get(p.getQualifiedName()) != null) { 363 log.error(tree.pos, 364 "pkg.clashes.with.class.of.same.name", 365 p); 366 } 367 p = p.owner; 368 } 369 } 370 // process package annotations 371 annotate.annotateLater(tree.annotations, env, env.toplevel.packge, null); 372 } 373 374 private void doImport(JCImport tree) { 375 dependencies.push(AttributionKind.IMPORT, tree); 376 JCFieldAccess imp = (JCFieldAccess)tree.qualid; 377 Name name = TreeInfo.name(imp); 378 379 // Create a local environment pointing to this tree to disable 380 // effects of other imports in Resolve.findGlobalType 381 Env<AttrContext> localEnv = env.dup(tree); 382 383 TypeSymbol p = attr.attribImportQualifier(tree, localEnv).tsym; 384 if (name == names.asterisk) { 385 // Import on demand. 386 chk.checkCanonical(imp.selected); 387 if (tree.staticImport) 388 importStaticAll(tree, p, env); 389 else 390 importAll(tree, p, env); 391 } else { 392 // Named type import. 393 if (tree.staticImport) { 394 importNamedStatic(tree, p, name, localEnv); 395 chk.checkCanonical(imp.selected); 396 } else { 397 TypeSymbol c = attribImportType(imp, localEnv).tsym; 398 chk.checkCanonical(imp); 399 importNamed(tree.pos(), c, env, tree); 400 } 401 } 402 dependencies.pop(); 403 } 404 405 Type attribImportType(JCTree tree, Env<AttrContext> env) { 406 Assert.check(completionEnabled); 407 Lint prevLint = chk.setLint(allowDeprecationOnImport ? 408 lint : lint.suppress(LintCategory.DEPRECATION)); 409 try { 410 // To prevent deep recursion, suppress completion of some 411 // types. 412 completionEnabled = false; 413 return attr.attribType(tree, env); 414 } finally { 415 completionEnabled = true; 416 chk.setLint(prevLint); 417 } 418 } 419 420 /** Import all classes of a class or package on demand. 421 * @param imp The import that is being handled. 422 * @param tsym The class or package the members of which are imported. 423 * @param env The env in which the imported classes will be entered. 424 */ 425 private void importAll(JCImport imp, 426 final TypeSymbol tsym, 427 Env<AttrContext> env) { 428 env.toplevel.starImportScope.importAll(types, tsym.members(), typeImportFilter, imp, cfHandler); 429 } 430 431 /** Import all static members of a class or package on demand. 432 * @param imp The import that is being handled. 433 * @param tsym The class or package the members of which are imported. 434 * @param env The env in which the imported classes will be entered. 435 */ 436 private void importStaticAll(JCImport imp, 437 final TypeSymbol tsym, 438 Env<AttrContext> env) { 439 final StarImportScope toScope = env.toplevel.starImportScope; 440 final TypeSymbol origin = tsym; 441 442 toScope.importAll(types, origin.members(), staticImportFilter, imp, cfHandler); 443 } 444 445 /** Import statics types of a given name. Non-types are handled in Attr. 446 * @param imp The import that is being handled. 447 * @param tsym The class from which the name is imported. 448 * @param name The (simple) name being imported. 449 * @param env The environment containing the named import 450 * scope to add to. 451 */ 452 private void importNamedStatic(final JCImport imp, 453 final TypeSymbol tsym, 454 final Name name, 455 final Env<AttrContext> env) { 456 if (tsym.kind != TYP) { 457 log.error(DiagnosticFlag.RECOVERABLE, imp.pos(), "static.imp.only.classes.and.interfaces"); 458 return; 459 } 460 461 final NamedImportScope toScope = env.toplevel.namedImportScope; 462 final Scope originMembers = tsym.members(); 463 464 imp.importScope = toScope.importByName(types, originMembers, name, staticImportFilter, imp, cfHandler); 465 } 466 467 /** Import given class. 468 * @param pos Position to be used for error reporting. 469 * @param tsym The class to be imported. 470 * @param env The environment containing the named import 471 * scope to add to. 472 */ 473 private void importNamed(DiagnosticPosition pos, final Symbol tsym, Env<AttrContext> env, JCImport imp) { 474 if (tsym.kind == TYP) 475 imp.importScope = env.toplevel.namedImportScope.importType(tsym.owner.members(), tsym.owner.members(), tsym); 476 } 477 478 } 479 480 /**Defines common utility methods used by the HierarchyPhase and HeaderPhase. 481 */ 482 private abstract class AbstractHeaderPhase extends Phase { 483 484 public AbstractHeaderPhase(CompletionCause phaseName, Phase next) { 485 super(phaseName, next); 486 } 487 488 protected Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) { 489 WriteableScope baseScope = WriteableScope.create(tree.sym); 490 //import already entered local classes into base scope 491 for (Symbol sym : env.outer.info.scope.getSymbols(NON_RECURSIVE)) { 492 if (sym.isLocal()) { 493 baseScope.enter(sym); 494 } 495 } 496 //import current type-parameters into base scope 497 if (tree.typarams != null) 498 for (List<JCTypeParameter> typarams = tree.typarams; 499 typarams.nonEmpty(); 500 typarams = typarams.tail) 501 baseScope.enter(typarams.head.type.tsym); 502 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class 503 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope)); 504 localEnv.baseClause = true; 505 localEnv.outer = outer; 506 localEnv.info.isSelfCall = false; 507 return localEnv; 508 } 509 510 /** Generate a base clause for an enum type. 511 * @param pos The position for trees and diagnostics, if any 512 * @param c The class symbol of the enum 513 */ 514 protected JCExpression enumBase(int pos, ClassSymbol c) { 515 JCExpression result = make.at(pos). 516 TypeApply(make.QualIdent(syms.enumSym), 517 List.<JCExpression>of(make.Type(c.type))); 518 return result; 519 } 520 521 protected Type modelMissingTypes(Type t, final JCExpression tree, final boolean interfaceExpected) { 522 if (!t.hasTag(ERROR)) 523 return t; 524 525 return new ErrorType(t.getOriginalType(), t.tsym) { 526 private Type modelType; 527 528 @Override 529 public Type getModelType() { 530 if (modelType == null) 531 modelType = new Synthesizer(getOriginalType(), interfaceExpected).visit(tree); 532 return modelType; 533 } 534 }; 535 } 536 // where: 537 private class Synthesizer extends JCTree.Visitor { 538 Type originalType; 539 boolean interfaceExpected; 540 List<ClassSymbol> synthesizedSymbols = List.nil(); 541 Type result; 542 543 Synthesizer(Type originalType, boolean interfaceExpected) { 544 this.originalType = originalType; 545 this.interfaceExpected = interfaceExpected; 546 } 547 548 Type visit(JCTree tree) { 549 tree.accept(this); 550 return result; 551 } 552 553 List<Type> visit(List<? extends JCTree> trees) { 554 ListBuffer<Type> lb = new ListBuffer<>(); 555 for (JCTree t: trees) 556 lb.append(visit(t)); 557 return lb.toList(); 558 } 559 560 @Override 561 public void visitTree(JCTree tree) { 562 result = syms.errType; 563 } 564 565 @Override 566 public void visitIdent(JCIdent tree) { 567 if (!tree.type.hasTag(ERROR)) { 568 result = tree.type; 569 } else { 570 result = synthesizeClass(tree.name, syms.unnamedPackage).type; 571 } 572 } 573 574 @Override 575 public void visitSelect(JCFieldAccess tree) { 576 if (!tree.type.hasTag(ERROR)) { 577 result = tree.type; 578 } else { 579 Type selectedType; 580 boolean prev = interfaceExpected; 581 try { 582 interfaceExpected = false; 583 selectedType = visit(tree.selected); 584 } finally { 585 interfaceExpected = prev; 586 } 587 ClassSymbol c = synthesizeClass(tree.name, selectedType.tsym); 588 result = c.type; 589 } 590 } 591 592 @Override 593 public void visitTypeApply(JCTypeApply tree) { 594 if (!tree.type.hasTag(ERROR)) { 595 result = tree.type; 596 } else { 597 ClassType clazzType = (ClassType) visit(tree.clazz); 598 if (synthesizedSymbols.contains(clazzType.tsym)) 599 synthesizeTyparams((ClassSymbol) clazzType.tsym, tree.arguments.size()); 600 final List<Type> actuals = visit(tree.arguments); 601 result = new ErrorType(tree.type, clazzType.tsym) { 602 @Override @DefinedBy(Api.LANGUAGE_MODEL) 603 public List<Type> getTypeArguments() { 604 return actuals; 605 } 606 }; 607 } 608 } 609 610 ClassSymbol synthesizeClass(Name name, Symbol owner) { 611 int flags = interfaceExpected ? INTERFACE : 0; 612 ClassSymbol c = new ClassSymbol(flags, name, owner); 613 c.members_field = new Scope.ErrorScope(c); 614 c.type = new ErrorType(originalType, c) { 615 @Override @DefinedBy(Api.LANGUAGE_MODEL) 616 public List<Type> getTypeArguments() { 617 return typarams_field; 618 } 619 }; 620 synthesizedSymbols = synthesizedSymbols.prepend(c); 621 return c; 622 } 623 624 void synthesizeTyparams(ClassSymbol sym, int n) { 625 ClassType ct = (ClassType) sym.type; 626 Assert.check(ct.typarams_field.isEmpty()); 627 if (n == 1) { 628 TypeVar v = new TypeVar(names.fromString("T"), sym, syms.botType); 629 ct.typarams_field = ct.typarams_field.prepend(v); 630 } else { 631 for (int i = n; i > 0; i--) { 632 TypeVar v = new TypeVar(names.fromString("T" + i), sym, 633 syms.botType); 634 ct.typarams_field = ct.typarams_field.prepend(v); 635 } 636 } 637 } 638 } 639 640 protected void attribSuperTypes(Env<AttrContext> env, Env<AttrContext> baseEnv) { 641 JCClassDecl tree = env.enclClass; 642 ClassSymbol sym = tree.sym; 643 ClassType ct = (ClassType)sym.type; 644 // Determine supertype. 645 Type supertype; 646 JCExpression extending; 647 648 if (tree.extending != null) { 649 extending = clearTypeParams(tree.extending); 650 dependencies.push(AttributionKind.EXTENDS, tree.extending); 651 try { 652 supertype = attr.attribBase(extending, baseEnv, 653 true, false, true); 654 } finally { 655 dependencies.pop(); 656 } 657 } else { 658 extending = null; 659 supertype = ((tree.mods.flags & Flags.ENUM) != 0) 660 ? attr.attribBase(enumBase(tree.pos, sym), baseEnv, 661 true, false, false) 662 : (sym.fullname == names.java_lang_Object) 663 ? Type.noType 664 : syms.objectType; 665 } 666 ct.supertype_field = modelMissingTypes(supertype, extending, false); 667 668 // Determine interfaces. 669 ListBuffer<Type> interfaces = new ListBuffer<>(); 670 ListBuffer<Type> all_interfaces = null; // lazy init 671 List<JCExpression> interfaceTrees = tree.implementing; 672 for (JCExpression iface : interfaceTrees) { 673 iface = clearTypeParams(iface); 674 dependencies.push(AttributionKind.IMPLEMENTS, iface); 675 try { 676 Type it = attr.attribBase(iface, baseEnv, false, true, true); 677 if (it.hasTag(CLASS)) { 678 interfaces.append(it); 679 if (all_interfaces != null) all_interfaces.append(it); 680 } else { 681 if (all_interfaces == null) 682 all_interfaces = new ListBuffer<Type>().appendList(interfaces); 683 all_interfaces.append(modelMissingTypes(it, iface, true)); 684 685 } 686 } finally { 687 dependencies.pop(); 688 } 689 } 690 691 if ((sym.flags_field & ANNOTATION) != 0) { 692 ct.interfaces_field = List.of(syms.annotationType); 693 ct.all_interfaces_field = ct.interfaces_field; 694 } else { 695 ct.interfaces_field = interfaces.toList(); 696 ct.all_interfaces_field = (all_interfaces == null) 697 ? ct.interfaces_field : all_interfaces.toList(); 698 } 699 } 700 //where: 701 protected JCExpression clearTypeParams(JCExpression superType) { 702 return superType; 703 } 704 } 705 706 private final class HierarchyPhase extends AbstractHeaderPhase implements Completer { 707 708 public HierarchyPhase() { 709 super(CompletionCause.HIERARCHY_PHASE, new HeaderPhase()); 710 } 711 712 @Override 713 protected void doCompleteEnvs(List<Env<AttrContext>> envs) { 714 //The ClassSymbols in the envs list may not be in the dependency order. 715 //To get proper results, for every class or interface C, the supertypes of 716 //C must be processed by the HierarchyPhase phase before C. 717 //To achieve that, the HierarchyPhase is registered as the Completer for 718 //all the classes first, and then all the classes are completed. 719 for (Env<AttrContext> env : envs) { 720 env.enclClass.sym.completer = this; 721 } 722 for (Env<AttrContext> env : envs) { 723 env.enclClass.sym.complete(); 724 } 725 } 726 727 @Override 728 protected void runPhase(Env<AttrContext> env) { 729 JCClassDecl tree = env.enclClass; 730 ClassSymbol sym = tree.sym; 731 ClassType ct = (ClassType)sym.type; 732 733 Env<AttrContext> baseEnv = baseEnv(tree, env); 734 735 attribSuperTypes(env, baseEnv); 736 737 if (sym.fullname == names.java_lang_Object) { 738 if (tree.extending != null) { 739 chk.checkNonCyclic(tree.extending.pos(), 740 ct.supertype_field); 741 ct.supertype_field = Type.noType; 742 } 743 else if (tree.implementing.nonEmpty()) { 744 chk.checkNonCyclic(tree.implementing.head.pos(), 745 ct.interfaces_field.head); 746 ct.interfaces_field = List.nil(); 747 } 748 } 749 750 // Annotations. 751 // In general, we cannot fully process annotations yet, but we 752 // can attribute the annotation types and then check to see if the 753 // @Deprecated annotation is present. 754 attr.attribAnnotationTypes(tree.mods.annotations, baseEnv); 755 if (hasDeprecatedAnnotation(tree.mods.annotations)) 756 sym.flags_field |= DEPRECATED; 757 758 chk.checkNonCyclicDecl(tree); 759 } 760 //where: 761 protected JCExpression clearTypeParams(JCExpression superType) { 762 switch (superType.getTag()) { 763 case TYPEAPPLY: 764 return ((JCTypeApply) superType).clazz; 765 } 766 767 return superType; 768 } 769 770 /** 771 * Check if a list of annotations contains a reference to 772 * java.lang.Deprecated. 773 **/ 774 private boolean hasDeprecatedAnnotation(List<JCAnnotation> annotations) { 775 for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) { 776 JCAnnotation a = al.head; 777 if (a.annotationType.type == syms.deprecatedType && a.args.isEmpty()) 778 return true; 779 } 780 return false; 781 } 782 783 @Override 784 public void complete(Symbol sym) throws CompletionFailure { 785 Env<AttrContext> env = typeEnvs.get((ClassSymbol) sym); 786 787 super.doCompleteEnvs(List.of(env)); 788 } 789 790 } 791 792 private final class HeaderPhase extends AbstractHeaderPhase { 793 794 public HeaderPhase() { 795 super(CompletionCause.HEADER_PHASE, new MembersPhase()); 796 } 797 798 @Override 799 protected void runPhase(Env<AttrContext> env) { 800 JCClassDecl tree = env.enclClass; 801 ClassSymbol sym = tree.sym; 802 ClassType ct = (ClassType)sym.type; 803 804 // create an environment for evaluating the base clauses 805 Env<AttrContext> baseEnv = baseEnv(tree, env); 806 807 if (tree.extending != null) 808 annotate.queueScanTreeAndTypeAnnotate(tree.extending, baseEnv, sym, tree.pos()); 809 for (JCExpression impl : tree.implementing) 810 annotate.queueScanTreeAndTypeAnnotate(impl, baseEnv, sym, tree.pos()); 811 annotate.flush(); 812 813 attribSuperTypes(env, baseEnv); 814 815 Set<Type> interfaceSet = new HashSet<>(); 816 817 for (JCExpression iface : tree.implementing) { 818 Type it = iface.type; 819 if (it.hasTag(CLASS)) 820 chk.checkNotRepeated(iface.pos(), types.erasure(it), interfaceSet); 821 } 822 823 annotate.annotateLater(tree.mods.annotations, baseEnv, 824 sym, tree.pos()); 825 826 attr.attribTypeVariables(tree.typarams, baseEnv); 827 for (JCTypeParameter tp : tree.typarams) 828 annotate.queueScanTreeAndTypeAnnotate(tp, baseEnv, sym, tree.pos()); 829 830 // check that no package exists with same fully qualified name, 831 // but admit classes in the unnamed package which have the same 832 // name as a top-level package. 833 if (checkClash && 834 sym.owner.kind == PCK && sym.owner != syms.unnamedPackage && 835 syms.packageExists(sym.fullname)) { 836 log.error(tree.pos, "clash.with.pkg.of.same.name", Kinds.kindName(sym), sym); 837 } 838 if (sym.owner.kind == PCK && (sym.flags_field & PUBLIC) == 0 && 839 !env.toplevel.sourcefile.isNameCompatible(sym.name.toString(),JavaFileObject.Kind.SOURCE)) { 840 sym.flags_field |= AUXILIARY; 841 } 842 } 843 } 844 845 /** Enter member fields and methods of a class 846 */ 847 private final class MembersPhase extends Phase { 848 849 public MembersPhase() { 850 super(CompletionCause.MEMBERS_PHASE, null); 851 } 852 853 @Override 854 protected void runPhase(Env<AttrContext> env) { 855 JCClassDecl tree = env.enclClass; 856 ClassSymbol sym = tree.sym; 857 ClassType ct = (ClassType)sym.type; 858 859 // Add default constructor if needed. 860 if ((sym.flags() & INTERFACE) == 0 && 861 !TreeInfo.hasConstructors(tree.defs)) { 862 List<Type> argtypes = List.nil(); 863 List<Type> typarams = List.nil(); 864 List<Type> thrown = List.nil(); 865 long ctorFlags = 0; 866 boolean based = false; 867 boolean addConstructor = true; 868 JCNewClass nc = null; 869 if (sym.name.isEmpty()) { 870 nc = (JCNewClass)env.next.tree; 871 if (nc.constructor != null) { 872 addConstructor = nc.constructor.kind != ERR; 873 Type superConstrType = types.memberType(sym.type, 874 nc.constructor); 875 argtypes = superConstrType.getParameterTypes(); 876 typarams = superConstrType.getTypeArguments(); 877 ctorFlags = nc.constructor.flags() & VARARGS; 878 if (nc.encl != null) { 879 argtypes = argtypes.prepend(nc.encl.type); 880 based = true; 881 } 882 thrown = superConstrType.getThrownTypes(); 883 } 884 } 885 if (addConstructor) { 886 MethodSymbol basedConstructor = nc != null ? 887 (MethodSymbol)nc.constructor : null; 888 JCTree constrDef = DefaultConstructor(make.at(tree.pos), sym, 889 basedConstructor, 890 typarams, argtypes, thrown, 891 ctorFlags, based); 892 tree.defs = tree.defs.prepend(constrDef); 893 } 894 } 895 896 // enter symbols for 'this' into current scope. 897 VarSymbol thisSym = 898 new VarSymbol(FINAL | HASINIT, names._this, sym.type, sym); 899 thisSym.pos = Position.FIRSTPOS; 900 env.info.scope.enter(thisSym); 901 // if this is a class, enter symbol for 'super' into current scope. 902 if ((sym.flags_field & INTERFACE) == 0 && 903 ct.supertype_field.hasTag(CLASS)) { 904 VarSymbol superSym = 905 new VarSymbol(FINAL | HASINIT, names._super, 906 ct.supertype_field, sym); 907 superSym.pos = Position.FIRSTPOS; 908 env.info.scope.enter(superSym); 909 } 910 911 finishClass(tree, env); 912 913 if (allowTypeAnnos) { 914 typeAnnotations.organizeTypeAnnotationsSignatures(env, (JCClassDecl)env.tree); 915 typeAnnotations.validateTypeAnnotationsSignatures(env, (JCClassDecl)env.tree); 916 } 917 } 918 919 /** Enter members for a class. 920 */ 921 void finishClass(JCClassDecl tree, Env<AttrContext> env) { 922 if ((tree.mods.flags & Flags.ENUM) != 0 && 923 (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) { 924 addEnumMembers(tree, env); 925 } 926 memberEnter.memberEnter(tree.defs, env); 927 928 if (tree.sym.isAnnotationType()) { 929 Assert.check(tree.sym.isCompleted()); 930 tree.sym.setAnnotationTypeMetadata(new AnnotationTypeMetadata(tree.sym, annotate.annotationTypeSourceCompleter())); 931 } 932 } 933 934 /** Add the implicit members for an enum type 935 * to the symbol table. 936 */ 937 private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) { 938 JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass)); 939 940 // public static T[] values() { return ???; } 941 JCMethodDecl values = make. 942 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC), 943 names.values, 944 valuesType, 945 List.<JCTypeParameter>nil(), 946 List.<JCVariableDecl>nil(), 947 List.<JCExpression>nil(), // thrown 948 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))), 949 null); 950 memberEnter.memberEnter(values, env); 951 952 // public static T valueOf(String name) { return ???; } 953 JCMethodDecl valueOf = make. 954 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC), 955 names.valueOf, 956 make.Type(tree.sym.type), 957 List.<JCTypeParameter>nil(), 958 List.of(make.VarDef(make.Modifiers(Flags.PARAMETER | 959 Flags.MANDATED), 960 names.fromString("name"), 961 make.Type(syms.stringType), null)), 962 List.<JCExpression>nil(), // thrown 963 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))), 964 null); 965 memberEnter.memberEnter(valueOf, env); 966 } 967 968 } 969 970/* *************************************************************************** 971 * tree building 972 ****************************************************************************/ 973 974 /** Generate default constructor for given class. For classes different 975 * from java.lang.Object, this is: 976 * 977 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown { 978 * super(x_0, ..., x_n) 979 * } 980 * 981 * or, if based == true: 982 * 983 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown { 984 * x_0.super(x_1, ..., x_n) 985 * } 986 * 987 * @param make The tree factory. 988 * @param c The class owning the default constructor. 989 * @param argtypes The parameter types of the constructor. 990 * @param thrown The thrown exceptions of the constructor. 991 * @param based Is first parameter a this$n? 992 */ 993 JCTree DefaultConstructor(TreeMaker make, 994 ClassSymbol c, 995 MethodSymbol baseInit, 996 List<Type> typarams, 997 List<Type> argtypes, 998 List<Type> thrown, 999 long flags, 1000 boolean based) { 1001 JCTree result; 1002 if ((c.flags() & ENUM) != 0 && 1003 (types.supertype(c.type).tsym == syms.enumSym)) { 1004 // constructors of true enums are private 1005 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR; 1006 } else 1007 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR; 1008 if (c.name.isEmpty()) { 1009 flags |= ANONCONSTR; 1010 } 1011 Type mType = new MethodType(argtypes, null, thrown, c); 1012 Type initType = typarams.nonEmpty() ? 1013 new ForAll(typarams, mType) : 1014 mType; 1015 MethodSymbol init = new MethodSymbol(flags, names.init, 1016 initType, c); 1017 init.params = createDefaultConstructorParams(make, baseInit, init, 1018 argtypes, based); 1019 List<JCVariableDecl> params = make.Params(argtypes, init); 1020 List<JCStatement> stats = List.nil(); 1021 if (c.type != syms.objectType) { 1022 stats = stats.prepend(SuperCall(make, typarams, params, based)); 1023 } 1024 result = make.MethodDef(init, make.Block(0, stats)); 1025 return result; 1026 } 1027 1028 private List<VarSymbol> createDefaultConstructorParams( 1029 TreeMaker make, 1030 MethodSymbol baseInit, 1031 MethodSymbol init, 1032 List<Type> argtypes, 1033 boolean based) { 1034 List<VarSymbol> initParams = null; 1035 List<Type> argTypesList = argtypes; 1036 if (based) { 1037 /* In this case argtypes will have an extra type, compared to baseInit, 1038 * corresponding to the type of the enclosing instance i.e.: 1039 * 1040 * Inner i = outer.new Inner(1){} 1041 * 1042 * in the above example argtypes will be (Outer, int) and baseInit 1043 * will have parameter's types (int). So in this case we have to add 1044 * first the extra type in argtypes and then get the names of the 1045 * parameters from baseInit. 1046 */ 1047 initParams = List.nil(); 1048 VarSymbol param = new VarSymbol(PARAMETER, make.paramName(0), argtypes.head, init); 1049 initParams = initParams.append(param); 1050 argTypesList = argTypesList.tail; 1051 } 1052 if (baseInit != null && baseInit.params != null && 1053 baseInit.params.nonEmpty() && argTypesList.nonEmpty()) { 1054 initParams = (initParams == null) ? List.<VarSymbol>nil() : initParams; 1055 List<VarSymbol> baseInitParams = baseInit.params; 1056 while (baseInitParams.nonEmpty() && argTypesList.nonEmpty()) { 1057 VarSymbol param = new VarSymbol(baseInitParams.head.flags() | PARAMETER, 1058 baseInitParams.head.name, argTypesList.head, init); 1059 initParams = initParams.append(param); 1060 baseInitParams = baseInitParams.tail; 1061 argTypesList = argTypesList.tail; 1062 } 1063 } 1064 return initParams; 1065 } 1066 1067 /** Generate call to superclass constructor. This is: 1068 * 1069 * super(id_0, ..., id_n) 1070 * 1071 * or, if based == true 1072 * 1073 * id_0.super(id_1,...,id_n) 1074 * 1075 * where id_0, ..., id_n are the names of the given parameters. 1076 * 1077 * @param make The tree factory 1078 * @param params The parameters that need to be passed to super 1079 * @param typarams The type parameters that need to be passed to super 1080 * @param based Is first parameter a this$n? 1081 */ 1082 JCExpressionStatement SuperCall(TreeMaker make, 1083 List<Type> typarams, 1084 List<JCVariableDecl> params, 1085 boolean based) { 1086 JCExpression meth; 1087 if (based) { 1088 meth = make.Select(make.Ident(params.head), names._super); 1089 params = params.tail; 1090 } else { 1091 meth = make.Ident(names._super); 1092 } 1093 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null; 1094 return make.Exec(make.Apply(typeargs, meth, make.Idents(params))); 1095 } 1096} 1097