TypeEnter.java revision 3874:97a60778fc6a
1/* 2 * Copyright (c) 2003, 2017, 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.CompletionCause; 58import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 59import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 60 61/** This is the second phase of Enter, in which classes are completed 62 * by resolving their headers and entering their members in the into 63 * the class scope. See Enter for an overall overview. 64 * 65 * This class uses internal phases to process the classes. When a phase 66 * processes classes, the lower phases are not invoked until all classes 67 * pass through the current phase. Note that it is possible that upper phases 68 * are run due to recursive completion. The internal phases are: 69 * - ImportPhase: shallow pass through imports, adds information about imports 70 * the NamedImportScope and StarImportScope, but avoids queries 71 * about class hierarchy. 72 * - HierarchyPhase: resolves the supertypes of the given class. Does not handle 73 * type parameters of the class or type argument of the supertypes. 74 * - HeaderPhase: finishes analysis of the header of the given class by resolving 75 * type parameters, attributing supertypes including type arguments 76 * and scheduling full annotation attribution. This phase also adds 77 * a synthetic default constructor if needed and synthetic "this" field. 78 * - MembersPhase: resolves headers for fields, methods and constructors in the given class. 79 * Also generates synthetic enum members. 80 * 81 * <p><b>This is NOT part of any supported API. 82 * If you write code that depends on this, you do so at your own risk. 83 * This code and its internal interfaces are subject to change or 84 * deletion without notice.</b> 85 */ 86public class TypeEnter implements Completer { 87 protected static final Context.Key<TypeEnter> typeEnterKey = new Context.Key<>(); 88 89 /** A switch to determine whether we check for package/class conflicts 90 */ 91 final static boolean checkClash = true; 92 93 private final Names names; 94 private final Enter enter; 95 private final MemberEnter memberEnter; 96 private final Log log; 97 private final Check chk; 98 private final Attr attr; 99 private final Symtab syms; 100 private final TreeMaker make; 101 private final Todo todo; 102 private final Annotate annotate; 103 private final TypeAnnotations typeAnnotations; 104 private final Types types; 105 private final JCDiagnostic.Factory diags; 106 private final DeferredLintHandler deferredLintHandler; 107 private final Lint lint; 108 private final TypeEnvs typeEnvs; 109 private final Dependencies dependencies; 110 111 public static TypeEnter instance(Context context) { 112 TypeEnter instance = context.get(typeEnterKey); 113 if (instance == null) 114 instance = new TypeEnter(context); 115 return instance; 116 } 117 118 protected TypeEnter(Context context) { 119 context.put(typeEnterKey, this); 120 names = Names.instance(context); 121 enter = Enter.instance(context); 122 memberEnter = MemberEnter.instance(context); 123 log = Log.instance(context); 124 chk = Check.instance(context); 125 attr = Attr.instance(context); 126 syms = Symtab.instance(context); 127 make = TreeMaker.instance(context); 128 todo = Todo.instance(context); 129 annotate = Annotate.instance(context); 130 typeAnnotations = TypeAnnotations.instance(context); 131 types = Types.instance(context); 132 diags = JCDiagnostic.Factory.instance(context); 133 deferredLintHandler = DeferredLintHandler.instance(context); 134 lint = Lint.instance(context); 135 typeEnvs = TypeEnvs.instance(context); 136 dependencies = Dependencies.instance(context); 137 Source source = Source.instance(context); 138 allowTypeAnnos = source.allowTypeAnnotations(); 139 allowDeprecationOnImport = source.allowDeprecationOnImport(); 140 } 141 142 /** Switch: support type annotations. 143 */ 144 boolean allowTypeAnnos; 145 146 /** 147 * Switch: should deprecation warnings be issued on import 148 */ 149 boolean allowDeprecationOnImport; 150 151 /** A flag to disable completion from time to time during member 152 * enter, as we only need to look up types. This avoids 153 * unnecessarily deep recursion. 154 */ 155 boolean completionEnabled = true; 156 157 /* Verify Imports: 158 */ 159 protected void ensureImportsChecked(List<JCCompilationUnit> trees) { 160 // if there remain any unimported toplevels (these must have 161 // no classes at all), process their import statements as well. 162 for (JCCompilationUnit tree : trees) { 163 if (!tree.starImportScope.isFilled()) { 164 Env<AttrContext> topEnv = enter.topLevelEnv(tree); 165 finishImports(tree, () -> { completeClass.resolveImports(tree, topEnv); }); 166 } 167 } 168 } 169 170/* ******************************************************************** 171 * Source completer 172 *********************************************************************/ 173 174 /** Complete entering a class. 175 * @param sym The symbol of the class to be completed. 176 */ 177 @Override 178 public void complete(Symbol sym) throws CompletionFailure { 179 // Suppress some (recursive) MemberEnter invocations 180 if (!completionEnabled) { 181 // Re-install same completer for next time around and return. 182 Assert.check((sym.flags() & Flags.COMPOUND) == 0); 183 sym.completer = this; 184 return; 185 } 186 187 try { 188 annotate.blockAnnotations(); 189 sym.flags_field |= UNATTRIBUTED; 190 191 List<Env<AttrContext>> queue; 192 193 dependencies.push((ClassSymbol) sym, CompletionCause.MEMBER_ENTER); 194 try { 195 queue = completeClass.completeEnvs(List.of(typeEnvs.get((ClassSymbol) sym))); 196 } finally { 197 dependencies.pop(); 198 } 199 200 if (!queue.isEmpty()) { 201 Set<JCCompilationUnit> seen = new HashSet<>(); 202 203 for (Env<AttrContext> env : queue) { 204 if (env.toplevel.defs.contains(env.enclClass) && seen.add(env.toplevel)) { 205 finishImports(env.toplevel, () -> {}); 206 } 207 } 208 } 209 } finally { 210 annotate.unblockAnnotations(); 211 } 212 } 213 214 void finishImports(JCCompilationUnit toplevel, Runnable resolve) { 215 JavaFileObject prev = log.useSource(toplevel.sourcefile); 216 try { 217 resolve.run(); 218 chk.checkImportsUnique(toplevel); 219 chk.checkImportsResolvable(toplevel); 220 chk.checkImportedPackagesObservable(toplevel); 221 toplevel.namedImportScope.finalizeScope(); 222 toplevel.starImportScope.finalizeScope(); 223 } finally { 224 log.useSource(prev); 225 } 226 } 227 228 abstract class Phase { 229 private final ListBuffer<Env<AttrContext>> queue = new ListBuffer<>(); 230 private final Phase next; 231 private final CompletionCause phaseName; 232 233 Phase(CompletionCause phaseName, Phase next) { 234 this.phaseName = phaseName; 235 this.next = next; 236 } 237 238 public final List<Env<AttrContext>> completeEnvs(List<Env<AttrContext>> envs) { 239 boolean firstToComplete = queue.isEmpty(); 240 241 Phase prevTopLevelPhase = topLevelPhase; 242 243 try { 244 topLevelPhase = this; 245 doCompleteEnvs(envs); 246 } finally { 247 topLevelPhase = prevTopLevelPhase; 248 } 249 250 if (firstToComplete) { 251 List<Env<AttrContext>> out = queue.toList(); 252 253 queue.clear(); 254 return next != null ? next.completeEnvs(out) : out; 255 } else { 256 return List.nil(); 257 } 258 } 259 260 protected void doCompleteEnvs(List<Env<AttrContext>> envs) { 261 for (Env<AttrContext> env : envs) { 262 JCClassDecl tree = (JCClassDecl)env.tree; 263 264 queue.add(env); 265 266 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 267 DiagnosticPosition prevLintPos = deferredLintHandler.setPos(tree.pos()); 268 try { 269 dependencies.push(env.enclClass.sym, phaseName); 270 runPhase(env); 271 } catch (CompletionFailure ex) { 272 chk.completionError(tree.pos(), ex); 273 } finally { 274 dependencies.pop(); 275 deferredLintHandler.setPos(prevLintPos); 276 log.useSource(prev); 277 } 278 } 279 } 280 281 protected abstract void runPhase(Env<AttrContext> env); 282 } 283 284 private final ImportsPhase completeClass = new ImportsPhase(); 285 private Phase topLevelPhase; 286 287 /**Analyze import clauses. 288 */ 289 private final class ImportsPhase extends Phase { 290 291 public ImportsPhase() { 292 super(CompletionCause.IMPORTS_PHASE, new HierarchyPhase()); 293 } 294 295 Env<AttrContext> env; 296 ImportFilter staticImportFilter; 297 ImportFilter typeImportFilter; 298 BiConsumer<JCImport, CompletionFailure> cfHandler = 299 (imp, cf) -> chk.completionError(imp.pos(), cf); 300 301 @Override 302 protected void runPhase(Env<AttrContext> env) { 303 JCClassDecl tree = env.enclClass; 304 ClassSymbol sym = tree.sym; 305 306 // If sym is a toplevel-class, make sure any import 307 // clauses in its source file have been seen. 308 if (sym.owner.kind == PCK) { 309 resolveImports(env.toplevel, env.enclosing(TOPLEVEL)); 310 todo.append(env); 311 } 312 313 if (sym.owner.kind == TYP) 314 sym.owner.complete(); 315 } 316 317 private void resolveImports(JCCompilationUnit tree, Env<AttrContext> env) { 318 if (tree.starImportScope.isFilled()) { 319 // we must have already processed this toplevel 320 return; 321 } 322 323 ImportFilter prevStaticImportFilter = staticImportFilter; 324 ImportFilter prevTypeImportFilter = typeImportFilter; 325 DiagnosticPosition prevLintPos = deferredLintHandler.immediate(); 326 Lint prevLint = chk.setLint(lint); 327 Env<AttrContext> prevEnv = this.env; 328 try { 329 this.env = env; 330 final PackageSymbol packge = env.toplevel.packge; 331 this.staticImportFilter = 332 (origin, sym) -> sym.isStatic() && 333 chk.importAccessible(sym, packge) && 334 sym.isMemberOf((TypeSymbol) origin.owner, types); 335 this.typeImportFilter = 336 (origin, sym) -> sym.kind == TYP && 337 chk.importAccessible(sym, packge); 338 339 // Import-on-demand java.lang. 340 PackageSymbol javaLang = syms.enterPackage(syms.java_base, names.java_lang); 341 if (javaLang.members().isEmpty() && !javaLang.exists()) 342 throw new FatalError(diags.fragment("fatal.err.no.java.lang")); 343 importAll(make.at(tree.pos()).Import(make.QualIdent(javaLang), false), javaLang, env); 344 345 JCModuleDecl decl = tree.getModuleDecl(); 346 347 // Process the package def and all import clauses. 348 if (tree.getPackage() != null && decl == null) 349 checkClassPackageClash(tree.getPackage()); 350 351 for (JCImport imp : tree.getImports()) { 352 doImport(imp); 353 } 354 355 if (decl != null) { 356 //check @Deprecated: 357 markDeprecated(decl.sym, decl.mods.annotations, env); 358 // process module annotations 359 annotate.annotateLater(decl.mods.annotations, env, env.toplevel.modle, null); 360 } 361 } finally { 362 this.env = prevEnv; 363 chk.setLint(prevLint); 364 deferredLintHandler.setPos(prevLintPos); 365 this.staticImportFilter = prevStaticImportFilter; 366 this.typeImportFilter = prevTypeImportFilter; 367 } 368 } 369 370 private void checkClassPackageClash(JCPackageDecl tree) { 371 // check that no class exists with same fully qualified name as 372 // toplevel package 373 if (checkClash && tree.pid != null) { 374 Symbol p = env.toplevel.packge; 375 while (p.owner != syms.rootPackage) { 376 p.owner.complete(); // enter all class members of p 377 //need to lookup the owning module/package: 378 PackageSymbol pack = syms.lookupPackage(env.toplevel.modle, p.owner.getQualifiedName()); 379 if (syms.getClass(pack.modle, p.getQualifiedName()) != null) { 380 log.error(tree.pos, 381 "pkg.clashes.with.class.of.same.name", 382 p); 383 } 384 p = p.owner; 385 } 386 } 387 // process package annotations 388 annotate.annotateLater(tree.annotations, env, env.toplevel.packge, null); 389 } 390 391 private void doImport(JCImport tree) { 392 JCFieldAccess imp = (JCFieldAccess)tree.qualid; 393 Name name = TreeInfo.name(imp); 394 395 // Create a local environment pointing to this tree to disable 396 // effects of other imports in Resolve.findGlobalType 397 Env<AttrContext> localEnv = env.dup(tree); 398 399 TypeSymbol p = attr.attribImportQualifier(tree, localEnv).tsym; 400 if (name == names.asterisk) { 401 // Import on demand. 402 chk.checkCanonical(imp.selected); 403 if (tree.staticImport) 404 importStaticAll(tree, p, env); 405 else 406 importAll(tree, p, env); 407 } else { 408 // Named type import. 409 if (tree.staticImport) { 410 importNamedStatic(tree, p, name, localEnv); 411 chk.checkCanonical(imp.selected); 412 } else { 413 TypeSymbol c = attribImportType(imp, localEnv).tsym; 414 chk.checkCanonical(imp); 415 importNamed(tree.pos(), c, env, tree); 416 } 417 } 418 } 419 420 Type attribImportType(JCTree tree, Env<AttrContext> env) { 421 Assert.check(completionEnabled); 422 Lint prevLint = chk.setLint(allowDeprecationOnImport ? 423 lint : lint.suppress(LintCategory.DEPRECATION, LintCategory.REMOVAL)); 424 try { 425 // To prevent deep recursion, suppress completion of some 426 // types. 427 completionEnabled = false; 428 return attr.attribType(tree, env); 429 } finally { 430 completionEnabled = true; 431 chk.setLint(prevLint); 432 } 433 } 434 435 /** Import all classes of a class or package on demand. 436 * @param imp The import that is being handled. 437 * @param tsym The class or package the members of which are imported. 438 * @param env The env in which the imported classes will be entered. 439 */ 440 private void importAll(JCImport imp, 441 final TypeSymbol tsym, 442 Env<AttrContext> env) { 443 env.toplevel.starImportScope.importAll(types, tsym.members(), typeImportFilter, imp, cfHandler); 444 } 445 446 /** Import all static members of a class or package on demand. 447 * @param imp The import that is being handled. 448 * @param tsym The class or package the members of which are imported. 449 * @param env The env in which the imported classes will be entered. 450 */ 451 private void importStaticAll(JCImport imp, 452 final TypeSymbol tsym, 453 Env<AttrContext> env) { 454 final StarImportScope toScope = env.toplevel.starImportScope; 455 final TypeSymbol origin = tsym; 456 457 toScope.importAll(types, origin.members(), staticImportFilter, imp, cfHandler); 458 } 459 460 /** Import statics types of a given name. Non-types are handled in Attr. 461 * @param imp The import that is being handled. 462 * @param tsym The class from which the name is imported. 463 * @param name The (simple) name being imported. 464 * @param env The environment containing the named import 465 * scope to add to. 466 */ 467 private void importNamedStatic(final JCImport imp, 468 final TypeSymbol tsym, 469 final Name name, 470 final Env<AttrContext> env) { 471 if (tsym.kind != TYP) { 472 log.error(DiagnosticFlag.RECOVERABLE, imp.pos(), "static.imp.only.classes.and.interfaces"); 473 return; 474 } 475 476 final NamedImportScope toScope = env.toplevel.namedImportScope; 477 final Scope originMembers = tsym.members(); 478 479 imp.importScope = toScope.importByName(types, originMembers, name, staticImportFilter, imp, cfHandler); 480 } 481 482 /** Import given class. 483 * @param pos Position to be used for error reporting. 484 * @param tsym The class to be imported. 485 * @param env The environment containing the named import 486 * scope to add to. 487 */ 488 private void importNamed(DiagnosticPosition pos, final Symbol tsym, Env<AttrContext> env, JCImport imp) { 489 if (tsym.kind == TYP) 490 imp.importScope = env.toplevel.namedImportScope.importType(tsym.owner.members(), tsym.owner.members(), tsym); 491 } 492 493 } 494 495 /**Defines common utility methods used by the HierarchyPhase and HeaderPhase. 496 */ 497 private abstract class AbstractHeaderPhase extends Phase { 498 499 public AbstractHeaderPhase(CompletionCause phaseName, Phase next) { 500 super(phaseName, next); 501 } 502 503 protected Env<AttrContext> baseEnv(JCClassDecl tree, Env<AttrContext> env) { 504 WriteableScope baseScope = WriteableScope.create(tree.sym); 505 //import already entered local classes into base scope 506 for (Symbol sym : env.outer.info.scope.getSymbols(NON_RECURSIVE)) { 507 if (sym.isLocal()) { 508 baseScope.enter(sym); 509 } 510 } 511 //import current type-parameters into base scope 512 if (tree.typarams != null) 513 for (List<JCTypeParameter> typarams = tree.typarams; 514 typarams.nonEmpty(); 515 typarams = typarams.tail) 516 baseScope.enter(typarams.head.type.tsym); 517 Env<AttrContext> outer = env.outer; // the base clause can't see members of this class 518 Env<AttrContext> localEnv = outer.dup(tree, outer.info.dup(baseScope)); 519 localEnv.baseClause = true; 520 localEnv.outer = outer; 521 localEnv.info.isSelfCall = false; 522 return localEnv; 523 } 524 525 /** Generate a base clause for an enum type. 526 * @param pos The position for trees and diagnostics, if any 527 * @param c The class symbol of the enum 528 */ 529 protected JCExpression enumBase(int pos, ClassSymbol c) { 530 JCExpression result = make.at(pos). 531 TypeApply(make.QualIdent(syms.enumSym), 532 List.of(make.Type(c.type))); 533 return result; 534 } 535 536 protected Type modelMissingTypes(Env<AttrContext> env, Type t, final JCExpression tree, final boolean interfaceExpected) { 537 if (!t.hasTag(ERROR)) 538 return t; 539 540 return new ErrorType(t.getOriginalType(), t.tsym) { 541 private Type modelType; 542 543 @Override 544 public Type getModelType() { 545 if (modelType == null) 546 modelType = new Synthesizer(env.toplevel.modle, getOriginalType(), interfaceExpected).visit(tree); 547 return modelType; 548 } 549 }; 550 } 551 // where: 552 private class Synthesizer extends JCTree.Visitor { 553 ModuleSymbol msym; 554 Type originalType; 555 boolean interfaceExpected; 556 List<ClassSymbol> synthesizedSymbols = List.nil(); 557 Type result; 558 559 Synthesizer(ModuleSymbol msym, Type originalType, boolean interfaceExpected) { 560 this.msym = msym; 561 this.originalType = originalType; 562 this.interfaceExpected = interfaceExpected; 563 } 564 565 Type visit(JCTree tree) { 566 tree.accept(this); 567 return result; 568 } 569 570 List<Type> visit(List<? extends JCTree> trees) { 571 ListBuffer<Type> lb = new ListBuffer<>(); 572 for (JCTree t: trees) 573 lb.append(visit(t)); 574 return lb.toList(); 575 } 576 577 @Override 578 public void visitTree(JCTree tree) { 579 result = syms.errType; 580 } 581 582 @Override 583 public void visitIdent(JCIdent tree) { 584 if (!tree.type.hasTag(ERROR)) { 585 result = tree.type; 586 } else { 587 result = synthesizeClass(tree.name, msym.unnamedPackage).type; 588 } 589 } 590 591 @Override 592 public void visitSelect(JCFieldAccess tree) { 593 if (!tree.type.hasTag(ERROR)) { 594 result = tree.type; 595 } else { 596 Type selectedType; 597 boolean prev = interfaceExpected; 598 try { 599 interfaceExpected = false; 600 selectedType = visit(tree.selected); 601 } finally { 602 interfaceExpected = prev; 603 } 604 ClassSymbol c = synthesizeClass(tree.name, selectedType.tsym); 605 result = c.type; 606 } 607 } 608 609 @Override 610 public void visitTypeApply(JCTypeApply tree) { 611 if (!tree.type.hasTag(ERROR)) { 612 result = tree.type; 613 } else { 614 ClassType clazzType = (ClassType) visit(tree.clazz); 615 if (synthesizedSymbols.contains(clazzType.tsym)) 616 synthesizeTyparams((ClassSymbol) clazzType.tsym, tree.arguments.size()); 617 final List<Type> actuals = visit(tree.arguments); 618 result = new ErrorType(tree.type, clazzType.tsym) { 619 @Override @DefinedBy(Api.LANGUAGE_MODEL) 620 public List<Type> getTypeArguments() { 621 return actuals; 622 } 623 }; 624 } 625 } 626 627 ClassSymbol synthesizeClass(Name name, Symbol owner) { 628 int flags = interfaceExpected ? INTERFACE : 0; 629 ClassSymbol c = new ClassSymbol(flags, name, owner); 630 c.members_field = new Scope.ErrorScope(c); 631 c.type = new ErrorType(originalType, c) { 632 @Override @DefinedBy(Api.LANGUAGE_MODEL) 633 public List<Type> getTypeArguments() { 634 return typarams_field; 635 } 636 }; 637 synthesizedSymbols = synthesizedSymbols.prepend(c); 638 return c; 639 } 640 641 void synthesizeTyparams(ClassSymbol sym, int n) { 642 ClassType ct = (ClassType) sym.type; 643 Assert.check(ct.typarams_field.isEmpty()); 644 if (n == 1) { 645 TypeVar v = new TypeVar(names.fromString("T"), sym, syms.botType); 646 ct.typarams_field = ct.typarams_field.prepend(v); 647 } else { 648 for (int i = n; i > 0; i--) { 649 TypeVar v = new TypeVar(names.fromString("T" + i), sym, 650 syms.botType); 651 ct.typarams_field = ct.typarams_field.prepend(v); 652 } 653 } 654 } 655 } 656 657 protected void attribSuperTypes(Env<AttrContext> env, Env<AttrContext> baseEnv) { 658 JCClassDecl tree = env.enclClass; 659 ClassSymbol sym = tree.sym; 660 ClassType ct = (ClassType)sym.type; 661 // Determine supertype. 662 Type supertype; 663 JCExpression extending; 664 665 if (tree.extending != null) { 666 extending = clearTypeParams(tree.extending); 667 supertype = attr.attribBase(extending, baseEnv, true, false, true); 668 } else { 669 extending = null; 670 supertype = ((tree.mods.flags & Flags.ENUM) != 0) 671 ? attr.attribBase(enumBase(tree.pos, sym), baseEnv, 672 true, false, false) 673 : (sym.fullname == names.java_lang_Object) 674 ? Type.noType 675 : syms.objectType; 676 } 677 ct.supertype_field = modelMissingTypes(baseEnv, supertype, extending, false); 678 679 // Determine interfaces. 680 ListBuffer<Type> interfaces = new ListBuffer<>(); 681 ListBuffer<Type> all_interfaces = null; // lazy init 682 List<JCExpression> interfaceTrees = tree.implementing; 683 for (JCExpression iface : interfaceTrees) { 684 iface = clearTypeParams(iface); 685 Type it = attr.attribBase(iface, baseEnv, false, true, true); 686 if (it.hasTag(CLASS)) { 687 interfaces.append(it); 688 if (all_interfaces != null) all_interfaces.append(it); 689 } else { 690 if (all_interfaces == null) 691 all_interfaces = new ListBuffer<Type>().appendList(interfaces); 692 all_interfaces.append(modelMissingTypes(baseEnv, it, iface, true)); 693 } 694 } 695 696 if ((sym.flags_field & ANNOTATION) != 0) { 697 ct.interfaces_field = List.of(syms.annotationType); 698 ct.all_interfaces_field = ct.interfaces_field; 699 } else { 700 ct.interfaces_field = interfaces.toList(); 701 ct.all_interfaces_field = (all_interfaces == null) 702 ? ct.interfaces_field : all_interfaces.toList(); 703 } 704 } 705 //where: 706 protected JCExpression clearTypeParams(JCExpression superType) { 707 return superType; 708 } 709 } 710 711 private final class HierarchyPhase extends AbstractHeaderPhase implements Completer { 712 713 public HierarchyPhase() { 714 super(CompletionCause.HIERARCHY_PHASE, new HeaderPhase()); 715 } 716 717 @Override 718 protected void doCompleteEnvs(List<Env<AttrContext>> envs) { 719 //The ClassSymbols in the envs list may not be in the dependency order. 720 //To get proper results, for every class or interface C, the supertypes of 721 //C must be processed by the HierarchyPhase phase before C. 722 //To achieve that, the HierarchyPhase is registered as the Completer for 723 //all the classes first, and then all the classes are completed. 724 for (Env<AttrContext> env : envs) { 725 env.enclClass.sym.completer = this; 726 } 727 for (Env<AttrContext> env : envs) { 728 env.enclClass.sym.complete(); 729 } 730 } 731 732 @Override 733 protected void runPhase(Env<AttrContext> env) { 734 JCClassDecl tree = env.enclClass; 735 ClassSymbol sym = tree.sym; 736 ClassType ct = (ClassType)sym.type; 737 738 Env<AttrContext> baseEnv = baseEnv(tree, env); 739 740 attribSuperTypes(env, baseEnv); 741 742 if (sym.fullname == names.java_lang_Object) { 743 if (tree.extending != null) { 744 chk.checkNonCyclic(tree.extending.pos(), 745 ct.supertype_field); 746 ct.supertype_field = Type.noType; 747 } 748 else if (tree.implementing.nonEmpty()) { 749 chk.checkNonCyclic(tree.implementing.head.pos(), 750 ct.interfaces_field.head); 751 ct.interfaces_field = List.nil(); 752 } 753 } 754 755 markDeprecated(sym, tree.mods.annotations, baseEnv); 756 757 chk.checkNonCyclicDecl(tree); 758 } 759 //where: 760 @Override 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 @Override 771 public void complete(Symbol sym) throws CompletionFailure { 772 Assert.check((topLevelPhase instanceof ImportsPhase) || 773 (topLevelPhase == this)); 774 775 if (topLevelPhase != this) { 776 //only do the processing based on dependencies in the HierarchyPhase: 777 sym.completer = this; 778 return ; 779 } 780 781 Env<AttrContext> env = typeEnvs.get((ClassSymbol) sym); 782 783 super.doCompleteEnvs(List.of(env)); 784 } 785 786 } 787 788 private final class HeaderPhase extends AbstractHeaderPhase { 789 790 public HeaderPhase() { 791 super(CompletionCause.HEADER_PHASE, new MembersPhase()); 792 } 793 794 @Override 795 protected void runPhase(Env<AttrContext> env) { 796 JCClassDecl tree = env.enclClass; 797 ClassSymbol sym = tree.sym; 798 ClassType ct = (ClassType)sym.type; 799 800 // create an environment for evaluating the base clauses 801 Env<AttrContext> baseEnv = baseEnv(tree, env); 802 803 if (tree.extending != null) 804 annotate.queueScanTreeAndTypeAnnotate(tree.extending, baseEnv, sym, tree.pos()); 805 for (JCExpression impl : tree.implementing) 806 annotate.queueScanTreeAndTypeAnnotate(impl, baseEnv, sym, tree.pos()); 807 annotate.flush(); 808 809 attribSuperTypes(env, baseEnv); 810 811 Set<Type> interfaceSet = new HashSet<>(); 812 813 for (JCExpression iface : tree.implementing) { 814 Type it = iface.type; 815 if (it.hasTag(CLASS)) 816 chk.checkNotRepeated(iface.pos(), types.erasure(it), interfaceSet); 817 } 818 819 annotate.annotateLater(tree.mods.annotations, baseEnv, 820 sym, tree.pos()); 821 822 attr.attribTypeVariables(tree.typarams, baseEnv); 823 for (JCTypeParameter tp : tree.typarams) 824 annotate.queueScanTreeAndTypeAnnotate(tp, baseEnv, sym, tree.pos()); 825 826 // check that no package exists with same fully qualified name, 827 // but admit classes in the unnamed package which have the same 828 // name as a top-level package. 829 if (checkClash && 830 sym.owner.kind == PCK && sym.owner != env.toplevel.modle.unnamedPackage && 831 syms.packageExists(env.toplevel.modle, sym.fullname)) { 832 log.error(tree.pos, "clash.with.pkg.of.same.name", Kinds.kindName(sym), sym); 833 } 834 if (sym.owner.kind == PCK && (sym.flags_field & PUBLIC) == 0 && 835 !env.toplevel.sourcefile.isNameCompatible(sym.name.toString(),JavaFileObject.Kind.SOURCE)) { 836 sym.flags_field |= AUXILIARY; 837 } 838 } 839 } 840 841 /** Enter member fields and methods of a class 842 */ 843 private final class MembersPhase extends Phase { 844 845 public MembersPhase() { 846 super(CompletionCause.MEMBERS_PHASE, null); 847 } 848 849 private boolean completing; 850 private List<Env<AttrContext>> todo = List.nil(); 851 852 @Override 853 protected void doCompleteEnvs(List<Env<AttrContext>> envs) { 854 todo = todo.prependList(envs); 855 if (completing) { 856 return ; //the top-level invocation will handle all envs 857 } 858 boolean prevCompleting = completing; 859 completing = true; 860 try { 861 while (todo.nonEmpty()) { 862 Env<AttrContext> head = todo.head; 863 todo = todo.tail; 864 super.doCompleteEnvs(List.of(head)); 865 } 866 } finally { 867 completing = prevCompleting; 868 } 869 } 870 871 @Override 872 protected void runPhase(Env<AttrContext> env) { 873 JCClassDecl tree = env.enclClass; 874 ClassSymbol sym = tree.sym; 875 ClassType ct = (ClassType)sym.type; 876 877 // Add default constructor if needed. 878 if ((sym.flags() & INTERFACE) == 0 && 879 !TreeInfo.hasConstructors(tree.defs)) { 880 List<Type> argtypes = List.nil(); 881 List<Type> typarams = List.nil(); 882 List<Type> thrown = List.nil(); 883 long ctorFlags = 0; 884 boolean based = false; 885 boolean addConstructor = true; 886 JCNewClass nc = null; 887 if (sym.name.isEmpty()) { 888 nc = (JCNewClass)env.next.tree; 889 if (nc.constructor != null) { 890 addConstructor = nc.constructor.kind != ERR; 891 Type superConstrType = types.memberType(sym.type, 892 nc.constructor); 893 argtypes = superConstrType.getParameterTypes(); 894 typarams = superConstrType.getTypeArguments(); 895 ctorFlags = nc.constructor.flags() & VARARGS; 896 if (nc.encl != null) { 897 argtypes = argtypes.prepend(nc.encl.type); 898 based = true; 899 } 900 thrown = superConstrType.getThrownTypes(); 901 } 902 } 903 if (addConstructor) { 904 MethodSymbol basedConstructor = nc != null ? 905 (MethodSymbol)nc.constructor : null; 906 JCTree constrDef = DefaultConstructor(make.at(tree.pos), sym, 907 basedConstructor, 908 typarams, argtypes, thrown, 909 ctorFlags, based); 910 tree.defs = tree.defs.prepend(constrDef); 911 } 912 } 913 914 // enter symbols for 'this' into current scope. 915 VarSymbol thisSym = 916 new VarSymbol(FINAL | HASINIT, names._this, sym.type, sym); 917 thisSym.pos = Position.FIRSTPOS; 918 env.info.scope.enter(thisSym); 919 // if this is a class, enter symbol for 'super' into current scope. 920 if ((sym.flags_field & INTERFACE) == 0 && 921 ct.supertype_field.hasTag(CLASS)) { 922 VarSymbol superSym = 923 new VarSymbol(FINAL | HASINIT, names._super, 924 ct.supertype_field, sym); 925 superSym.pos = Position.FIRSTPOS; 926 env.info.scope.enter(superSym); 927 } 928 929 finishClass(tree, env); 930 931 if (allowTypeAnnos) { 932 typeAnnotations.organizeTypeAnnotationsSignatures(env, (JCClassDecl)env.tree); 933 typeAnnotations.validateTypeAnnotationsSignatures(env, (JCClassDecl)env.tree); 934 } 935 } 936 937 /** Enter members for a class. 938 */ 939 void finishClass(JCClassDecl tree, Env<AttrContext> env) { 940 if ((tree.mods.flags & Flags.ENUM) != 0 && 941 !tree.sym.type.hasTag(ERROR) && 942 (types.supertype(tree.sym.type).tsym.flags() & Flags.ENUM) == 0) { 943 addEnumMembers(tree, env); 944 } 945 memberEnter.memberEnter(tree.defs, env); 946 947 if (tree.sym.isAnnotationType()) { 948 Assert.check(tree.sym.isCompleted()); 949 tree.sym.setAnnotationTypeMetadata(new AnnotationTypeMetadata(tree.sym, annotate.annotationTypeSourceCompleter())); 950 } 951 } 952 953 /** Add the implicit members for an enum type 954 * to the symbol table. 955 */ 956 private void addEnumMembers(JCClassDecl tree, Env<AttrContext> env) { 957 JCExpression valuesType = make.Type(new ArrayType(tree.sym.type, syms.arrayClass)); 958 959 // public static T[] values() { return ???; } 960 JCMethodDecl values = make. 961 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC), 962 names.values, 963 valuesType, 964 List.nil(), 965 List.nil(), 966 List.nil(), // thrown 967 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))), 968 null); 969 memberEnter.memberEnter(values, env); 970 971 // public static T valueOf(String name) { return ???; } 972 JCMethodDecl valueOf = make. 973 MethodDef(make.Modifiers(Flags.PUBLIC|Flags.STATIC), 974 names.valueOf, 975 make.Type(tree.sym.type), 976 List.nil(), 977 List.of(make.VarDef(make.Modifiers(Flags.PARAMETER | 978 Flags.MANDATED), 979 names.fromString("name"), 980 make.Type(syms.stringType), null)), 981 List.nil(), // thrown 982 null, //make.Block(0, Tree.emptyList.prepend(make.Return(make.Ident(names._null)))), 983 null); 984 memberEnter.memberEnter(valueOf, env); 985 } 986 987 } 988 989/* *************************************************************************** 990 * tree building 991 ****************************************************************************/ 992 993 /** Generate default constructor for given class. For classes different 994 * from java.lang.Object, this is: 995 * 996 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown { 997 * super(x_0, ..., x_n) 998 * } 999 * 1000 * or, if based == true: 1001 * 1002 * c(argtype_0 x_0, ..., argtype_n x_n) throws thrown { 1003 * x_0.super(x_1, ..., x_n) 1004 * } 1005 * 1006 * @param make The tree factory. 1007 * @param c The class owning the default constructor. 1008 * @param argtypes The parameter types of the constructor. 1009 * @param thrown The thrown exceptions of the constructor. 1010 * @param based Is first parameter a this$n? 1011 */ 1012 JCTree DefaultConstructor(TreeMaker make, 1013 ClassSymbol c, 1014 MethodSymbol baseInit, 1015 List<Type> typarams, 1016 List<Type> argtypes, 1017 List<Type> thrown, 1018 long flags, 1019 boolean based) { 1020 JCTree result; 1021 if ((c.flags() & ENUM) != 0 && 1022 (types.supertype(c.type).tsym == syms.enumSym)) { 1023 // constructors of true enums are private 1024 flags = (flags & ~AccessFlags) | PRIVATE | GENERATEDCONSTR; 1025 } else 1026 flags |= (c.flags() & AccessFlags) | GENERATEDCONSTR; 1027 if (c.name.isEmpty()) { 1028 flags |= ANONCONSTR; 1029 } 1030 Type mType = new MethodType(argtypes, null, thrown, c); 1031 Type initType = typarams.nonEmpty() ? 1032 new ForAll(typarams, mType) : 1033 mType; 1034 MethodSymbol init = new MethodSymbol(flags, names.init, 1035 initType, c); 1036 init.params = createDefaultConstructorParams(make, baseInit, init, 1037 argtypes, based); 1038 List<JCVariableDecl> params = make.Params(argtypes, init); 1039 List<JCStatement> stats = List.nil(); 1040 if (c.type != syms.objectType) { 1041 stats = stats.prepend(SuperCall(make, typarams, params, based)); 1042 } 1043 result = make.MethodDef(init, make.Block(0, stats)); 1044 return result; 1045 } 1046 1047 private List<VarSymbol> createDefaultConstructorParams( 1048 TreeMaker make, 1049 MethodSymbol baseInit, 1050 MethodSymbol init, 1051 List<Type> argtypes, 1052 boolean based) { 1053 List<VarSymbol> initParams = null; 1054 List<Type> argTypesList = argtypes; 1055 if (based) { 1056 /* In this case argtypes will have an extra type, compared to baseInit, 1057 * corresponding to the type of the enclosing instance i.e.: 1058 * 1059 * Inner i = outer.new Inner(1){} 1060 * 1061 * in the above example argtypes will be (Outer, int) and baseInit 1062 * will have parameter's types (int). So in this case we have to add 1063 * first the extra type in argtypes and then get the names of the 1064 * parameters from baseInit. 1065 */ 1066 initParams = List.nil(); 1067 VarSymbol param = new VarSymbol(PARAMETER, make.paramName(0), argtypes.head, init); 1068 initParams = initParams.append(param); 1069 argTypesList = argTypesList.tail; 1070 } 1071 if (baseInit != null && baseInit.params != null && 1072 baseInit.params.nonEmpty() && argTypesList.nonEmpty()) { 1073 initParams = (initParams == null) ? List.nil() : initParams; 1074 List<VarSymbol> baseInitParams = baseInit.params; 1075 while (baseInitParams.nonEmpty() && argTypesList.nonEmpty()) { 1076 VarSymbol param = new VarSymbol(baseInitParams.head.flags() | PARAMETER, 1077 baseInitParams.head.name, argTypesList.head, init); 1078 initParams = initParams.append(param); 1079 baseInitParams = baseInitParams.tail; 1080 argTypesList = argTypesList.tail; 1081 } 1082 } 1083 return initParams; 1084 } 1085 1086 /** Generate call to superclass constructor. This is: 1087 * 1088 * super(id_0, ..., id_n) 1089 * 1090 * or, if based == true 1091 * 1092 * id_0.super(id_1,...,id_n) 1093 * 1094 * where id_0, ..., id_n are the names of the given parameters. 1095 * 1096 * @param make The tree factory 1097 * @param params The parameters that need to be passed to super 1098 * @param typarams The type parameters that need to be passed to super 1099 * @param based Is first parameter a this$n? 1100 */ 1101 JCExpressionStatement SuperCall(TreeMaker make, 1102 List<Type> typarams, 1103 List<JCVariableDecl> params, 1104 boolean based) { 1105 JCExpression meth; 1106 if (based) { 1107 meth = make.Select(make.Ident(params.head), names._super); 1108 params = params.tail; 1109 } else { 1110 meth = make.Ident(names._super); 1111 } 1112 List<JCExpression> typeargs = typarams.nonEmpty() ? make.Types(typarams) : null; 1113 return make.Exec(make.Apply(typeargs, meth, make.Idents(params))); 1114 } 1115 1116 /** 1117 * Mark sym deprecated if annotations contain @Deprecated annotation. 1118 */ 1119 public void markDeprecated(Symbol sym, List<JCAnnotation> annotations, Env<AttrContext> env) { 1120 // In general, we cannot fully process annotations yet, but we 1121 // can attribute the annotation types and then check to see if the 1122 // @Deprecated annotation is present. 1123 attr.attribAnnotationTypes(annotations, env); 1124 handleDeprecatedAnnotations(annotations, sym); 1125 } 1126 1127 /** 1128 * If a list of annotations contains a reference to java.lang.Deprecated, 1129 * set the DEPRECATED flag. 1130 * If the annotation is marked forRemoval=true, also set DEPRECATED_REMOVAL. 1131 **/ 1132 private void handleDeprecatedAnnotations(List<JCAnnotation> annotations, Symbol sym) { 1133 for (List<JCAnnotation> al = annotations; !al.isEmpty(); al = al.tail) { 1134 JCAnnotation a = al.head; 1135 if (a.annotationType.type == syms.deprecatedType) { 1136 sym.flags_field |= (Flags.DEPRECATED | Flags.DEPRECATED_ANNOTATION); 1137 a.args.stream() 1138 .filter(e -> e.hasTag(ASSIGN)) 1139 .map(e -> (JCAssign) e) 1140 .filter(assign -> TreeInfo.name(assign.lhs) == names.forRemoval) 1141 .findFirst() 1142 .ifPresent(assign -> { 1143 JCExpression rhs = TreeInfo.skipParens(assign.rhs); 1144 if (rhs.hasTag(LITERAL) 1145 && Boolean.TRUE.equals(((JCLiteral) rhs).getValue())) { 1146 sym.flags_field |= DEPRECATED_REMOVAL; 1147 } 1148 }); 1149 } 1150 } 1151 } 1152} 1153