1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.javac.comp; 27 28 import java.util.*; 29 import java.util.function.BiConsumer; 30 import java.util.stream.Collectors; 31 32 import javax.lang.model.element.ElementKind; 33 import javax.tools.JavaFileObject; 34 35 import com.sun.source.tree.CaseTree.CaseKind; 36 import com.sun.source.tree.IdentifierTree; 37 import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 38 import com.sun.source.tree.MemberSelectTree; 39 import com.sun.source.tree.TreeVisitor; 40 import com.sun.source.util.SimpleTreeVisitor; 41 import com.sun.tools.javac.code.*; 42 import com.sun.tools.javac.code.Lint.LintCategory; 43 import com.sun.tools.javac.code.Scope.WriteableScope; 44 import com.sun.tools.javac.code.Source.Feature; 45 import com.sun.tools.javac.code.Symbol.*; 46 import com.sun.tools.javac.code.Type.*; 47 import com.sun.tools.javac.code.TypeMetadata.Annotations; 48 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 49 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext; 50 import com.sun.tools.javac.comp.Check.CheckContext; 51 import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 52 import com.sun.tools.javac.jvm.*; 53 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 54 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 56 import com.sun.tools.javac.resources.CompilerProperties.Errors; 57 import com.sun.tools.javac.resources.CompilerProperties.Fragments; 58 import com.sun.tools.javac.resources.CompilerProperties.Warnings; 59 import com.sun.tools.javac.tree.*; 60 import com.sun.tools.javac.tree.JCTree.*; 61 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 62 import com.sun.tools.javac.util.*; 63 import com.sun.tools.javac.util.DefinedBy.Api; 64 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 65 import com.sun.tools.javac.util.JCDiagnostic.Error; 66 import com.sun.tools.javac.util.JCDiagnostic.Fragment; 67 import com.sun.tools.javac.util.JCDiagnostic.Warning; 68 import com.sun.tools.javac.util.List; 69 70 import static com.sun.tools.javac.code.Flags.*; 71 import static com.sun.tools.javac.code.Flags.ANNOTATION; 72 import static com.sun.tools.javac.code.Flags.BLOCK; 73 import static com.sun.tools.javac.code.Kinds.*; 74 import static com.sun.tools.javac.code.Kinds.Kind.*; 75 import static com.sun.tools.javac.code.TypeTag.*; 76 import static com.sun.tools.javac.code.TypeTag.WILDCARD; 77 import com.sun.tools.javac.comp.Analyzer.AnalyzerMode; 78 import static com.sun.tools.javac.tree.JCTree.Tag.*; 79 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 80 81 /** This is the main context-dependent analysis phase in GJC. It 82 * encompasses name resolution, type checking and constant folding as 83 * subtasks. Some subtasks involve auxiliary classes. 84 * @see Check 85 * @see Resolve 86 * @see ConstFold 87 * @see Infer 88 * 89 * <p><b>This is NOT part of any supported API. 90 * If you write code that depends on this, you do so at your own risk. 91 * This code and its internal interfaces are subject to change or 92 * deletion without notice.</b> 93 */ 94 public class Attr extends JCTree.Visitor { 95 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 96 97 final Names names; 98 final Log log; 99 final Symtab syms; 100 final Resolve rs; 101 final Operators operators; 102 final Infer infer; 103 final Analyzer analyzer; 104 final DeferredAttr deferredAttr; 105 final Check chk; 106 final Flow flow; 107 final MemberEnter memberEnter; 108 final TypeEnter typeEnter; 109 final TreeMaker make; 110 final ConstFold cfolder; 111 final Enter enter; 112 final Target target; 113 final Types types; 114 final JCDiagnostic.Factory diags; 115 final TypeAnnotations typeAnnotations; 116 final DeferredLintHandler deferredLintHandler; 117 final TypeEnvs typeEnvs; 118 final Dependencies dependencies; 119 final Annotate annotate; 120 final ArgumentAttr argumentAttr; 121 122 public static Attr instance(Context context) { 123 Attr instance = context.get(attrKey); 124 if (instance == null) 125 instance = new Attr(context); 126 return instance; 127 } 128 129 protected Attr(Context context) { 130 context.put(attrKey, this); 131 132 names = Names.instance(context); 133 log = Log.instance(context); 134 syms = Symtab.instance(context); 135 rs = Resolve.instance(context); 136 operators = Operators.instance(context); 137 chk = Check.instance(context); 138 flow = Flow.instance(context); 139 memberEnter = MemberEnter.instance(context); 140 typeEnter = TypeEnter.instance(context); 141 make = TreeMaker.instance(context); 142 enter = Enter.instance(context); 143 infer = Infer.instance(context); 144 analyzer = Analyzer.instance(context); 145 deferredAttr = DeferredAttr.instance(context); 146 cfolder = ConstFold.instance(context); 147 target = Target.instance(context); 148 types = Types.instance(context); 149 diags = JCDiagnostic.Factory.instance(context); 150 annotate = Annotate.instance(context); 151 typeAnnotations = TypeAnnotations.instance(context); 152 deferredLintHandler = DeferredLintHandler.instance(context); 153 typeEnvs = TypeEnvs.instance(context); 154 dependencies = Dependencies.instance(context); 155 argumentAttr = ArgumentAttr.instance(context); 156 157 Options options = Options.instance(context); 158 159 Source source = Source.instance(context); 160 allowPoly = Feature.POLY.allowedInSource(source); 161 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source); 162 allowLambda = Feature.LAMBDA.allowedInSource(source); 163 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source); 164 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source); 165 sourceName = source.name; 166 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 167 168 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 169 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 170 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 171 methodAttrInfo = new MethodAttrInfo(); 172 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 173 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 174 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 175 } 176 177 /** Switch: support target-typing inference 178 */ 179 boolean allowPoly; 180 181 /** Switch: support type annotations. 182 */ 183 boolean allowTypeAnnos; 184 185 /** Switch: support lambda expressions ? 186 */ 187 boolean allowLambda; 188 189 /** Switch: support default methods ? 190 */ 191 boolean allowDefaultMethods; 192 193 /** Switch: static interface methods enabled? 194 */ 195 boolean allowStaticInterfaceMethods; 196 197 /** 198 * Switch: warn about use of variable before declaration? 199 * RFE: 6425594 200 */ 201 boolean useBeforeDeclarationWarning; 202 203 /** 204 * Switch: name of source level; used for error reporting. 205 */ 206 String sourceName; 207 208 /** Check kind and type of given tree against protokind and prototype. 209 * If check succeeds, store type in tree and return it. 210 * If check fails, store errType in tree and return it. 211 * No checks are performed if the prototype is a method type. 212 * It is not necessary in this case since we know that kind and type 213 * are correct. 214 * 215 * @param tree The tree whose kind and type is checked 216 * @param found The computed type of the tree 217 * @param ownkind The computed kind of the tree 218 * @param resultInfo The expected result of the tree 219 */ 220 Type check(final JCTree tree, 221 final Type found, 222 final KindSelector ownkind, 223 final ResultInfo resultInfo) { 224 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 225 Type owntype; 226 boolean shouldCheck = !found.hasTag(ERROR) && 227 !resultInfo.pt.hasTag(METHOD) && 228 !resultInfo.pt.hasTag(FORALL); 229 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 230 log.error(tree.pos(), 231 Errors.UnexpectedType(resultInfo.pkind.kindNames(), 232 ownkind.kindNames())); 233 owntype = types.createErrorType(found); 234 } else if (allowPoly && inferenceContext.free(found)) { 235 //delay the check if there are inference variables in the found type 236 //this means we are dealing with a partially inferred poly expression 237 owntype = shouldCheck ? resultInfo.pt : found; 238 if (resultInfo.checkMode.installPostInferenceHook()) { 239 inferenceContext.addFreeTypeListener(List.of(found), 240 instantiatedContext -> { 241 ResultInfo pendingResult = 242 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 243 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 244 }); 245 } 246 } else { 247 owntype = shouldCheck ? 248 resultInfo.check(tree, found) : 249 found; 250 } 251 if (resultInfo.checkMode.updateTreeType()) { 252 tree.type = owntype; 253 } 254 return owntype; 255 } 256 257 /** Is given blank final variable assignable, i.e. in a scope where it 258 * may be assigned to even though it is final? 259 * @param v The blank final variable. 260 * @param env The current environment. 261 */ 262 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 263 Symbol owner = env.info.scope.owner; 264 // owner refers to the innermost variable, method or 265 // initializer block declaration at this point. 266 return 267 v.owner == owner 268 || 269 ((owner.name == names.init || // i.e. we are in a constructor 270 owner.kind == VAR || // i.e. we are in a variable initializer 271 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 272 && 273 v.owner == owner.owner 274 && 275 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 276 } 277 278 /** Check that variable can be assigned to. 279 * @param pos The current source code position. 280 * @param v The assigned variable 281 * @param base If the variable is referred to in a Select, the part 282 * to the left of the `.', null otherwise. 283 * @param env The current environment. 284 */ 285 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 286 if (v.name == names._this) { 287 log.error(pos, Errors.CantAssignValToThis); 288 } else if ((v.flags() & FINAL) != 0 && 289 ((v.flags() & HASINIT) != 0 290 || 291 !((base == null || 292 TreeInfo.isThisQualifier(base)) && 293 isAssignableAsBlankFinal(v, env)))) { 294 if (v.isResourceVariable()) { //TWR resource 295 log.error(pos, Errors.TryResourceMayNotBeAssigned(v)); 296 } else { 297 log.error(pos, Errors.CantAssignValToFinalVar(v)); 298 } 299 } 300 } 301 302 /** Does tree represent a static reference to an identifier? 303 * It is assumed that tree is either a SELECT or an IDENT. 304 * We have to weed out selects from non-type names here. 305 * @param tree The candidate tree. 306 */ 307 boolean isStaticReference(JCTree tree) { 308 if (tree.hasTag(SELECT)) { 309 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 310 if (lsym == null || lsym.kind != TYP) { 311 return false; 312 } 313 } 314 return true; 315 } 316 317 /** Is this symbol a type? 318 */ 319 static boolean isType(Symbol sym) { 320 return sym != null && sym.kind == TYP; 321 } 322 323 /** The current `this' symbol. 324 * @param env The current environment. 325 */ 326 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 327 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 328 } 329 330 /** Attribute a parsed identifier. 331 * @param tree Parsed identifier name 332 * @param topLevel The toplevel to use 333 */ 334 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 335 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 336 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 337 syms.errSymbol.name, 338 null, null, null, null); 339 localEnv.enclClass.sym = syms.errSymbol; 340 return attribIdent(tree, localEnv); 341 } 342 343 /** Attribute a parsed identifier. 344 * @param tree Parsed identifier name 345 * @param env The env to use 346 */ 347 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 348 return tree.accept(identAttributer, env); 349 } 350 // where 351 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 352 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 353 @Override @DefinedBy(Api.COMPILER_TREE) 354 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 355 Symbol site = visit(node.getExpression(), env); 356 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN) 357 return site; 358 Name name = (Name)node.getIdentifier(); 359 if (site.kind == PCK) { 360 env.toplevel.packge = (PackageSymbol)site; 361 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 362 KindSelector.TYP_PCK); 363 } else { 364 env.enclClass.sym = (ClassSymbol)site; 365 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 366 } 367 } 368 369 @Override @DefinedBy(Api.COMPILER_TREE) 370 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 371 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 372 } 373 } 374 375 public Type coerce(Type etype, Type ttype) { 376 return cfolder.coerce(etype, ttype); 377 } 378 379 public Type attribType(JCTree node, TypeSymbol sym) { 380 Env<AttrContext> env = typeEnvs.get(sym); 381 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 382 return attribTree(node, localEnv, unknownTypeInfo); 383 } 384 385 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 386 // Attribute qualifying package or class. 387 JCFieldAccess s = (JCFieldAccess)tree.qualid; 388 return attribTree(s.selected, env, 389 new ResultInfo(tree.staticImport ? 390 KindSelector.TYP : KindSelector.TYP_PCK, 391 Type.noType)); 392 } 393 394 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 395 breakTree = tree; 396 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 397 EnumSet<AnalyzerMode> analyzerModes = EnumSet.copyOf(analyzer.analyzerModes); 398 try { 399 analyzer.analyzerModes.clear(); 400 attribExpr(expr, env); 401 } catch (BreakAttr b) { 402 return b.env; 403 } catch (AssertionError ae) { 404 if (ae.getCause() instanceof BreakAttr) { 405 return ((BreakAttr)(ae.getCause())).env; 406 } else { 407 throw ae; 408 } 409 } finally { 410 breakTree = null; 411 log.useSource(prev); 412 analyzer.analyzerModes.addAll(analyzerModes); 413 } 414 return env; 415 } 416 417 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 418 breakTree = tree; 419 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 420 EnumSet<AnalyzerMode> analyzerModes = EnumSet.copyOf(analyzer.analyzerModes); 421 try { 422 analyzer.analyzerModes.clear(); 423 attribStat(stmt, env); 424 } catch (BreakAttr b) { 425 return b.env; 426 } catch (AssertionError ae) { 427 if (ae.getCause() instanceof BreakAttr) { 428 return ((BreakAttr)(ae.getCause())).env; 429 } else { 430 throw ae; 431 } 432 } finally { 433 breakTree = null; 434 log.useSource(prev); 435 analyzer.analyzerModes.addAll(analyzerModes); 436 } 437 return env; 438 } 439 440 private JCTree breakTree = null; 441 442 private static class BreakAttr extends RuntimeException { 443 static final long serialVersionUID = -6924771130405446405L; 444 private Env<AttrContext> env; 445 private BreakAttr(Env<AttrContext> env) { 446 this.env = env; 447 } 448 } 449 450 /** 451 * Mode controlling behavior of Attr.Check 452 */ 453 enum CheckMode { 454 455 NORMAL, 456 457 /** 458 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is 459 * that the captured var cache in {@code InferenceContext} will be used in read-only 460 * mode when performing inference checks. 461 */ 462 NO_TREE_UPDATE { 463 @Override 464 public boolean updateTreeType() { 465 return false; 466 } 467 }, 468 /** 469 * Mode signalling that caller will manage free types in tree decorations. 470 */ 471 NO_INFERENCE_HOOK { 472 @Override 473 public boolean installPostInferenceHook() { 474 return false; 475 } 476 }; 477 478 public boolean updateTreeType() { 479 return true; 480 } 481 public boolean installPostInferenceHook() { 482 return true; 483 } 484 } 485 486 487 class ResultInfo { 488 final KindSelector pkind; 489 final Type pt; 490 final CheckContext checkContext; 491 final CheckMode checkMode; 492 493 ResultInfo(KindSelector pkind, Type pt) { 494 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 495 } 496 497 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 498 this(pkind, pt, chk.basicHandler, checkMode); 499 } 500 501 protected ResultInfo(KindSelector pkind, 502 Type pt, CheckContext checkContext) { 503 this(pkind, pt, checkContext, CheckMode.NORMAL); 504 } 505 506 protected ResultInfo(KindSelector pkind, 507 Type pt, CheckContext checkContext, CheckMode checkMode) { 508 this.pkind = pkind; 509 this.pt = pt; 510 this.checkContext = checkContext; 511 this.checkMode = checkMode; 512 } 513 514 /** 515 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one? 516 * @param tree The tree to be type-checked. 517 * @return true if {@ArgumentAttr} should be used. 518 */ 519 protected boolean needsArgumentAttr(JCTree tree) { return false; } 520 521 protected Type check(final DiagnosticPosition pos, final Type found) { 522 return chk.checkType(pos, found, pt, checkContext); 523 } 524 525 protected ResultInfo dup(Type newPt) { 526 return new ResultInfo(pkind, newPt, checkContext, checkMode); 527 } 528 529 protected ResultInfo dup(CheckContext newContext) { 530 return new ResultInfo(pkind, pt, newContext, checkMode); 531 } 532 533 protected ResultInfo dup(Type newPt, CheckContext newContext) { 534 return new ResultInfo(pkind, newPt, newContext, checkMode); 535 } 536 537 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 538 return new ResultInfo(pkind, newPt, newContext, newMode); 539 } 540 541 protected ResultInfo dup(CheckMode newMode) { 542 return new ResultInfo(pkind, pt, checkContext, newMode); 543 } 544 545 @Override 546 public String toString() { 547 if (pt != null) { 548 return pt.toString(); 549 } else { 550 return ""; 551 } 552 } 553 } 554 555 class MethodAttrInfo extends ResultInfo { 556 public MethodAttrInfo() { 557 this(chk.basicHandler); 558 } 559 560 public MethodAttrInfo(CheckContext checkContext) { 561 super(KindSelector.VAL, Infer.anyPoly, checkContext); 562 } 563 564 @Override 565 protected boolean needsArgumentAttr(JCTree tree) { 566 return true; 567 } 568 569 protected ResultInfo dup(Type newPt) { 570 throw new IllegalStateException(); 571 } 572 573 protected ResultInfo dup(CheckContext newContext) { 574 return new MethodAttrInfo(newContext); 575 } 576 577 protected ResultInfo dup(Type newPt, CheckContext newContext) { 578 throw new IllegalStateException(); 579 } 580 581 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 582 throw new IllegalStateException(); 583 } 584 585 protected ResultInfo dup(CheckMode newMode) { 586 throw new IllegalStateException(); 587 } 588 } 589 590 class RecoveryInfo extends ResultInfo { 591 592 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 593 this(deferredAttrContext, Type.recoveryType); 594 } 595 596 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) { 597 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) { 598 @Override 599 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 600 return deferredAttrContext; 601 } 602 @Override 603 public boolean compatible(Type found, Type req, Warner warn) { 604 return true; 605 } 606 @Override 607 public void report(DiagnosticPosition pos, JCDiagnostic details) { 608 if (pt == Type.recoveryType) { 609 chk.basicHandler.report(pos, details); 610 } 611 } 612 }); 613 } 614 } 615 616 final ResultInfo statInfo; 617 final ResultInfo varAssignmentInfo; 618 final ResultInfo methodAttrInfo; 619 final ResultInfo unknownExprInfo; 620 final ResultInfo unknownTypeInfo; 621 final ResultInfo unknownTypeExprInfo; 622 final ResultInfo recoveryInfo; 623 624 Type pt() { 625 return resultInfo.pt; 626 } 627 628 KindSelector pkind() { 629 return resultInfo.pkind; 630 } 631 632 /* ************************************************************************ 633 * Visitor methods 634 *************************************************************************/ 635 636 /** Visitor argument: the current environment. 637 */ 638 Env<AttrContext> env; 639 640 /** Visitor argument: the currently expected attribution result. 641 */ 642 ResultInfo resultInfo; 643 644 /** Visitor result: the computed type. 645 */ 646 Type result; 647 648 /** Visitor method: attribute a tree, catching any completion failure 649 * exceptions. Return the tree's type. 650 * 651 * @param tree The tree to be visited. 652 * @param env The environment visitor argument. 653 * @param resultInfo The result info visitor argument. 654 */ 655 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 656 Env<AttrContext> prevEnv = this.env; 657 ResultInfo prevResult = this.resultInfo; 658 try { 659 this.env = env; 660 this.resultInfo = resultInfo; 661 if (resultInfo.needsArgumentAttr(tree)) { 662 result = argumentAttr.attribArg(tree, env); 663 } else { 664 tree.accept(this); 665 } 666 if (tree == breakTree && 667 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 668 breakTreeFound(copyEnv(env)); 669 } 670 return result; 671 } catch (CompletionFailure ex) { 672 tree.type = syms.errType; 673 return chk.completionError(tree.pos(), ex); 674 } finally { 675 this.env = prevEnv; 676 this.resultInfo = prevResult; 677 } 678 } 679 680 protected void breakTreeFound(Env<AttrContext> env) { 681 throw new BreakAttr(env); 682 } 683 684 Env<AttrContext> copyEnv(Env<AttrContext> env) { 685 Env<AttrContext> newEnv = 686 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 687 if (newEnv.outer != null) { 688 newEnv.outer = copyEnv(newEnv.outer); 689 } 690 return newEnv; 691 } 692 693 WriteableScope copyScope(WriteableScope sc) { 694 WriteableScope newScope = WriteableScope.create(sc.owner); 695 List<Symbol> elemsList = List.nil(); 696 for (Symbol sym : sc.getSymbols()) { 697 elemsList = elemsList.prepend(sym); 698 } 699 for (Symbol s : elemsList) { 700 newScope.enter(s); 701 } 702 return newScope; 703 } 704 705 /** Derived visitor method: attribute an expression tree. 706 */ 707 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 708 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 709 } 710 711 /** Derived visitor method: attribute an expression tree with 712 * no constraints on the computed type. 713 */ 714 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 715 return attribTree(tree, env, unknownExprInfo); 716 } 717 718 /** Derived visitor method: attribute a type tree. 719 */ 720 public Type attribType(JCTree tree, Env<AttrContext> env) { 721 Type result = attribType(tree, env, Type.noType); 722 return result; 723 } 724 725 /** Derived visitor method: attribute a type tree. 726 */ 727 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 728 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 729 return result; 730 } 731 732 /** Derived visitor method: attribute a statement or definition tree. 733 */ 734 public Type attribStat(JCTree tree, Env<AttrContext> env) { 735 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env); 736 try { 737 return attribTree(tree, env, statInfo); 738 } finally { 739 analyzer.analyzeIfNeeded(tree, analyzeEnv); 740 } 741 } 742 743 /** Attribute a list of expressions, returning a list of types. 744 */ 745 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 746 ListBuffer<Type> ts = new ListBuffer<>(); 747 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 748 ts.append(attribExpr(l.head, env, pt)); 749 return ts.toList(); 750 } 751 752 /** Attribute a list of statements, returning nothing. 753 */ 754 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 755 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 756 attribStat(l.head, env); 757 } 758 759 /** Attribute the arguments in a method call, returning the method kind. 760 */ 761 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 762 KindSelector kind = initialKind; 763 for (JCExpression arg : trees) { 764 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 765 if (argtype.hasTag(DEFERRED)) { 766 kind = KindSelector.of(KindSelector.POLY, kind); 767 } 768 argtypes.append(argtype); 769 } 770 return kind; 771 } 772 773 /** Attribute a type argument list, returning a list of types. 774 * Caller is responsible for calling checkRefTypes. 775 */ 776 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 777 ListBuffer<Type> argtypes = new ListBuffer<>(); 778 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 779 argtypes.append(attribType(l.head, env)); 780 return argtypes.toList(); 781 } 782 783 /** Attribute a type argument list, returning a list of types. 784 * Check that all the types are references. 785 */ 786 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 787 List<Type> types = attribAnyTypes(trees, env); 788 return chk.checkRefTypes(trees, types); 789 } 790 791 /** 792 * Attribute type variables (of generic classes or methods). 793 * Compound types are attributed later in attribBounds. 794 * @param typarams the type variables to enter 795 * @param env the current environment 796 */ 797 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 798 for (JCTypeParameter tvar : typarams) { 799 TypeVar a = (TypeVar)tvar.type; 800 a.tsym.flags_field |= UNATTRIBUTED; 801 a.bound = Type.noType; 802 if (!tvar.bounds.isEmpty()) { 803 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 804 for (JCExpression bound : tvar.bounds.tail) 805 bounds = bounds.prepend(attribType(bound, env)); 806 types.setBounds(a, bounds.reverse()); 807 } else { 808 // if no bounds are given, assume a single bound of 809 // java.lang.Object. 810 types.setBounds(a, List.of(syms.objectType)); 811 } 812 a.tsym.flags_field &= ~UNATTRIBUTED; 813 } 814 for (JCTypeParameter tvar : typarams) { 815 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 816 } 817 } 818 819 /** 820 * Attribute the type references in a list of annotations. 821 */ 822 void attribAnnotationTypes(List<JCAnnotation> annotations, 823 Env<AttrContext> env) { 824 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 825 JCAnnotation a = al.head; 826 attribType(a.annotationType, env); 827 } 828 } 829 830 /** 831 * Attribute a "lazy constant value". 832 * @param env The env for the const value 833 * @param variable The initializer for the const value 834 * @param type The expected type, or null 835 * @see VarSymbol#setLazyConstValue 836 */ 837 public Object attribLazyConstantValue(Env<AttrContext> env, 838 JCVariableDecl variable, 839 Type type) { 840 841 DiagnosticPosition prevLintPos 842 = deferredLintHandler.setPos(variable.pos()); 843 844 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 845 try { 846 Type itype = attribExpr(variable.init, env, type); 847 if (variable.isImplicitlyTyped()) { 848 //fixup local variable type 849 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name); 850 } 851 if (itype.constValue() != null) { 852 return coerce(itype, type).constValue(); 853 } else { 854 return null; 855 } 856 } finally { 857 log.useSource(prevSource); 858 deferredLintHandler.setPos(prevLintPos); 859 } 860 } 861 862 /** Attribute type reference in an `extends' or `implements' clause. 863 * Supertypes of anonymous inner classes are usually already attributed. 864 * 865 * @param tree The tree making up the type reference. 866 * @param env The environment current at the reference. 867 * @param classExpected true if only a class is expected here. 868 * @param interfaceExpected true if only an interface is expected here. 869 */ 870 Type attribBase(JCTree tree, 871 Env<AttrContext> env, 872 boolean classExpected, 873 boolean interfaceExpected, 874 boolean checkExtensible) { 875 Type t = tree.type != null ? 876 tree.type : 877 attribType(tree, env); 878 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 879 } 880 Type checkBase(Type t, 881 JCTree tree, 882 Env<AttrContext> env, 883 boolean classExpected, 884 boolean interfaceExpected, 885 boolean checkExtensible) { 886 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 887 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 888 if (t.tsym.isAnonymous()) { 889 log.error(pos, Errors.CantInheritFromAnon); 890 return types.createErrorType(t); 891 } 892 if (t.isErroneous()) 893 return t; 894 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 895 // check that type variable is already visible 896 if (t.getUpperBound() == null) { 897 log.error(pos, Errors.IllegalForwardRef); 898 return types.createErrorType(t); 899 } 900 } else { 901 t = chk.checkClassType(pos, t, checkExtensible); 902 } 903 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 904 log.error(pos, Errors.IntfExpectedHere); 905 // return errType is necessary since otherwise there might 906 // be undetected cycles which cause attribution to loop 907 return types.createErrorType(t); 908 } else if (checkExtensible && 909 classExpected && 910 (t.tsym.flags() & INTERFACE) != 0) { 911 log.error(pos, Errors.NoIntfExpectedHere); 912 return types.createErrorType(t); 913 } 914 if (checkExtensible && 915 ((t.tsym.flags() & FINAL) != 0)) { 916 log.error(pos, 917 Errors.CantInheritFromFinal(t.tsym)); 918 } 919 chk.checkNonCyclic(pos, t); 920 return t; 921 } 922 923 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 924 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 925 id.type = env.info.scope.owner.enclClass().type; 926 id.sym = env.info.scope.owner.enclClass(); 927 return id.type; 928 } 929 930 public void visitClassDef(JCClassDecl tree) { 931 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 932 Optional.ofNullable(env.info.isSpeculative ? 933 argumentAttr.withLocalCacheContext() : null); 934 try { 935 // Local and anonymous classes have not been entered yet, so we need to 936 // do it now. 937 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 938 enter.classEnter(tree, env); 939 } else { 940 // If this class declaration is part of a class level annotation, 941 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 942 // order to simplify later steps and allow for sensible error 943 // messages. 944 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 945 enter.classEnter(tree, env); 946 } 947 948 ClassSymbol c = tree.sym; 949 if (c == null) { 950 // exit in case something drastic went wrong during enter. 951 result = null; 952 } else { 953 // make sure class has been completed: 954 c.complete(); 955 956 // If this class appears as an anonymous class 957 // in a superclass constructor call 958 // disable implicit outer instance from being passed. 959 // (This would be an illegal access to "this before super"). 960 if (env.info.isSelfCall && 961 env.tree.hasTag(NEWCLASS)) { 962 c.flags_field |= NOOUTERTHIS; 963 } 964 attribClass(tree.pos(), c); 965 result = tree.type = c.type; 966 } 967 } finally { 968 localCacheContext.ifPresent(LocalCacheContext::leave); 969 } 970 } 971 972 public void visitMethodDef(JCMethodDecl tree) { 973 MethodSymbol m = tree.sym; 974 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 975 976 Lint lint = env.info.lint.augment(m); 977 Lint prevLint = chk.setLint(lint); 978 MethodSymbol prevMethod = chk.setMethod(m); 979 try { 980 deferredLintHandler.flush(tree.pos()); 981 chk.checkDeprecatedAnnotation(tree.pos(), m); 982 983 984 // Create a new environment with local scope 985 // for attributing the method. 986 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 987 localEnv.info.lint = lint; 988 989 attribStats(tree.typarams, localEnv); 990 991 // If we override any other methods, check that we do so properly. 992 // JLS ??? 993 if (m.isStatic()) { 994 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 995 } else { 996 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 997 } 998 chk.checkOverride(env, tree, m); 999 1000 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 1001 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location())); 1002 } 1003 1004 // Enter all type parameters into the local method scope. 1005 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 1006 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 1007 1008 ClassSymbol owner = env.enclClass.sym; 1009 if ((owner.flags() & ANNOTATION) != 0 && 1010 (tree.params.nonEmpty() || 1011 tree.recvparam != null)) 1012 log.error(tree.params.nonEmpty() ? 1013 tree.params.head.pos() : 1014 tree.recvparam.pos(), 1015 Errors.IntfAnnotationMembersCantHaveParams); 1016 1017 // Attribute all value parameters. 1018 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 1019 attribStat(l.head, localEnv); 1020 } 1021 1022 chk.checkVarargsMethodDecl(localEnv, tree); 1023 1024 // Check that type parameters are well-formed. 1025 chk.validate(tree.typarams, localEnv); 1026 1027 // Check that result type is well-formed. 1028 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 1029 chk.validate(tree.restype, localEnv); 1030 1031 // Check that receiver type is well-formed. 1032 if (tree.recvparam != null) { 1033 // Use a new environment to check the receiver parameter. 1034 // Otherwise I get "might not have been initialized" errors. 1035 // Is there a better way? 1036 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1037 attribType(tree.recvparam, newEnv); 1038 chk.validate(tree.recvparam, newEnv); 1039 } 1040 1041 // annotation method checks 1042 if ((owner.flags() & ANNOTATION) != 0) { 1043 // annotation method cannot have throws clause 1044 if (tree.thrown.nonEmpty()) { 1045 log.error(tree.thrown.head.pos(), 1046 Errors.ThrowsNotAllowedInIntfAnnotation); 1047 } 1048 // annotation method cannot declare type-parameters 1049 if (tree.typarams.nonEmpty()) { 1050 log.error(tree.typarams.head.pos(), 1051 Errors.IntfAnnotationMembersCantHaveTypeParams); 1052 } 1053 // validate annotation method's return type (could be an annotation type) 1054 chk.validateAnnotationType(tree.restype); 1055 // ensure that annotation method does not clash with members of Object/Annotation 1056 chk.validateAnnotationMethod(tree.pos(), m); 1057 } 1058 1059 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1060 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1061 1062 if (tree.body == null) { 1063 // Empty bodies are only allowed for 1064 // abstract, native, or interface methods, or for methods 1065 // in a retrofit signature class. 1066 if (tree.defaultValue != null) { 1067 if ((owner.flags() & ANNOTATION) == 0) 1068 log.error(tree.pos(), 1069 Errors.DefaultAllowedInIntfAnnotationMember); 1070 } 1071 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1072 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract); 1073 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1074 if ((owner.flags() & INTERFACE) != 0) { 1075 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody); 1076 } else { 1077 log.error(tree.pos(), Errors.AbstractMethCantHaveBody); 1078 } 1079 } else if ((tree.mods.flags & NATIVE) != 0) { 1080 log.error(tree.pos(), Errors.NativeMethCantHaveBody); 1081 } else { 1082 // Add an implicit super() call unless an explicit call to 1083 // super(...) or this(...) is given 1084 // or we are compiling class java.lang.Object. 1085 if (tree.name == names.init && owner.type != syms.objectType) { 1086 JCBlock body = tree.body; 1087 if (body.stats.isEmpty() || 1088 !TreeInfo.isSelfCall(body.stats.head)) { 1089 body.stats = body.stats. 1090 prepend(typeEnter.SuperCall(make.at(body.pos), 1091 List.nil(), 1092 List.nil(), 1093 false)); 1094 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1095 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1096 TreeInfo.isSuperCall(body.stats.head)) { 1097 // enum constructors are not allowed to call super 1098 // directly, so make sure there aren't any super calls 1099 // in enum constructors, except in the compiler 1100 // generated one. 1101 log.error(tree.body.stats.head.pos(), 1102 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym)); 1103 } 1104 } 1105 1106 // Attribute all type annotations in the body 1107 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1108 annotate.flush(); 1109 1110 // Attribute method body. 1111 attribStat(tree.body, localEnv); 1112 } 1113 1114 localEnv.info.scope.leave(); 1115 result = tree.type = m.type; 1116 } finally { 1117 chk.setLint(prevLint); 1118 chk.setMethod(prevMethod); 1119 } 1120 } 1121 1122 public void visitVarDef(JCVariableDecl tree) { 1123 // Local variables have not been entered yet, so we need to do it now: 1124 if (env.info.scope.owner.kind == MTH) { 1125 if (tree.sym != null) { 1126 // parameters have already been entered 1127 env.info.scope.enter(tree.sym); 1128 } else { 1129 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) { 1130 if (tree.init == null) { 1131 //cannot use 'var' without initializer 1132 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit)); 1133 tree.vartype = make.Erroneous(); 1134 } else { 1135 Fragment msg = canInferLocalVarType(tree); 1136 if (msg != null) { 1137 //cannot use 'var' with initializer which require an explicit target 1138 //(e.g. lambda, method reference, array initializer). 1139 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg)); 1140 tree.vartype = make.Erroneous(); 1141 } 1142 } 1143 } 1144 try { 1145 annotate.blockAnnotations(); 1146 memberEnter.memberEnter(tree, env); 1147 } finally { 1148 annotate.unblockAnnotations(); 1149 } 1150 } 1151 } else { 1152 if (tree.init != null) { 1153 // Field initializer expression need to be entered. 1154 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1155 annotate.flush(); 1156 } 1157 } 1158 1159 VarSymbol v = tree.sym; 1160 Lint lint = env.info.lint.augment(v); 1161 Lint prevLint = chk.setLint(lint); 1162 1163 // Check that the variable's declared type is well-formed. 1164 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1165 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1166 (tree.sym.flags() & PARAMETER) != 0; 1167 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped()); 1168 1169 try { 1170 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1171 deferredLintHandler.flush(tree.pos()); 1172 chk.checkDeprecatedAnnotation(tree.pos(), v); 1173 1174 if (tree.init != null) { 1175 if ((v.flags_field & FINAL) == 0 || 1176 !memberEnter.needsLazyConstValue(tree.init)) { 1177 // Not a compile-time constant 1178 // Attribute initializer in a new environment 1179 // with the declared variable as owner. 1180 // Check that initializer conforms to variable's declared type. 1181 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1182 initEnv.info.lint = lint; 1183 // In order to catch self-references, we set the variable's 1184 // declaration position to maximal possible value, effectively 1185 // marking the variable as undefined. 1186 initEnv.info.enclVar = v; 1187 attribExpr(tree.init, initEnv, v.type); 1188 if (tree.isImplicitlyTyped()) { 1189 //fixup local variable type 1190 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name); 1191 } 1192 } 1193 if (tree.isImplicitlyTyped()) { 1194 setSyntheticVariableType(tree, v.type); 1195 } 1196 } 1197 result = tree.type = v.type; 1198 } 1199 finally { 1200 chk.setLint(prevLint); 1201 } 1202 } 1203 1204 Fragment canInferLocalVarType(JCVariableDecl tree) { 1205 LocalInitScanner lis = new LocalInitScanner(); 1206 lis.scan(tree.init); 1207 return lis.badInferenceMsg; 1208 } 1209 1210 static class LocalInitScanner extends TreeScanner { 1211 Fragment badInferenceMsg = null; 1212 boolean needsTarget = true; 1213 1214 @Override 1215 public void visitNewArray(JCNewArray tree) { 1216 if (tree.elemtype == null && needsTarget) { 1217 badInferenceMsg = Fragments.LocalArrayMissingTarget; 1218 } 1219 } 1220 1221 @Override 1222 public void visitLambda(JCLambda tree) { 1223 if (needsTarget) { 1224 badInferenceMsg = Fragments.LocalLambdaMissingTarget; 1225 } 1226 } 1227 1228 @Override 1229 public void visitTypeCast(JCTypeCast tree) { 1230 boolean prevNeedsTarget = needsTarget; 1231 try { 1232 needsTarget = false; 1233 super.visitTypeCast(tree); 1234 } finally { 1235 needsTarget = prevNeedsTarget; 1236 } 1237 } 1238 1239 @Override 1240 public void visitReference(JCMemberReference tree) { 1241 if (needsTarget) { 1242 badInferenceMsg = Fragments.LocalMrefMissingTarget; 1243 } 1244 } 1245 1246 @Override 1247 public void visitNewClass(JCNewClass tree) { 1248 boolean prevNeedsTarget = needsTarget; 1249 try { 1250 needsTarget = false; 1251 super.visitNewClass(tree); 1252 } finally { 1253 needsTarget = prevNeedsTarget; 1254 } 1255 } 1256 1257 @Override 1258 public void visitApply(JCMethodInvocation tree) { 1259 boolean prevNeedsTarget = needsTarget; 1260 try { 1261 needsTarget = false; 1262 super.visitApply(tree); 1263 } finally { 1264 needsTarget = prevNeedsTarget; 1265 } 1266 } 1267 } 1268 1269 public void visitSkip(JCSkip tree) { 1270 result = null; 1271 } 1272 1273 public void visitBlock(JCBlock tree) { 1274 if (env.info.scope.owner.kind == TYP) { 1275 // Block is a static or instance initializer; 1276 // let the owner of the environment be a freshly 1277 // created BLOCK-method. 1278 Symbol fakeOwner = 1279 new MethodSymbol(tree.flags | BLOCK | 1280 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1281 env.info.scope.owner); 1282 final Env<AttrContext> localEnv = 1283 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1284 1285 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1286 // Attribute all type annotations in the block 1287 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1288 annotate.flush(); 1289 attribStats(tree.stats, localEnv); 1290 1291 { 1292 // Store init and clinit type annotations with the ClassSymbol 1293 // to allow output in Gen.normalizeDefs. 1294 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1295 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1296 if ((tree.flags & STATIC) != 0) { 1297 cs.appendClassInitTypeAttributes(tas); 1298 } else { 1299 cs.appendInitTypeAttributes(tas); 1300 } 1301 } 1302 } else { 1303 // Create a new local environment with a local scope. 1304 Env<AttrContext> localEnv = 1305 env.dup(tree, env.info.dup(env.info.scope.dup())); 1306 try { 1307 attribStats(tree.stats, localEnv); 1308 } finally { 1309 localEnv.info.scope.leave(); 1310 } 1311 } 1312 result = null; 1313 } 1314 1315 public void visitDoLoop(JCDoWhileLoop tree) { 1316 attribStat(tree.body, env.dup(tree)); 1317 attribExpr(tree.cond, env, syms.booleanType); 1318 result = null; 1319 } 1320 1321 public void visitWhileLoop(JCWhileLoop tree) { 1322 attribExpr(tree.cond, env, syms.booleanType); 1323 attribStat(tree.body, env.dup(tree)); 1324 result = null; 1325 } 1326 1327 public void visitForLoop(JCForLoop tree) { 1328 Env<AttrContext> loopEnv = 1329 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1330 try { 1331 attribStats(tree.init, loopEnv); 1332 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1333 loopEnv.tree = tree; // before, we were not in loop! 1334 attribStats(tree.step, loopEnv); 1335 attribStat(tree.body, loopEnv); 1336 result = null; 1337 } 1338 finally { 1339 loopEnv.info.scope.leave(); 1340 } 1341 } 1342 1343 public void visitForeachLoop(JCEnhancedForLoop tree) { 1344 Env<AttrContext> loopEnv = 1345 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1346 try { 1347 //the Formal Parameter of a for-each loop is not in the scope when 1348 //attributing the for-each expression; we mimick this by attributing 1349 //the for-each expression first (against original scope). 1350 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1351 chk.checkNonVoid(tree.pos(), exprType); 1352 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1353 if (elemtype == null) { 1354 // or perhaps expr implements Iterable<T>? 1355 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1356 if (base == null) { 1357 log.error(tree.expr.pos(), 1358 Errors.ForeachNotApplicableToType(exprType, 1359 Fragments.TypeReqArrayOrIterable)); 1360 elemtype = types.createErrorType(exprType); 1361 } else { 1362 List<Type> iterableParams = base.allparams(); 1363 elemtype = iterableParams.isEmpty() 1364 ? syms.objectType 1365 : types.wildUpperBound(iterableParams.head); 1366 } 1367 } 1368 if (tree.var.isImplicitlyTyped()) { 1369 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name); 1370 setSyntheticVariableType(tree.var, inferredType); 1371 } 1372 attribStat(tree.var, loopEnv); 1373 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1374 loopEnv.tree = tree; // before, we were not in loop! 1375 attribStat(tree.body, loopEnv); 1376 result = null; 1377 } 1378 finally { 1379 loopEnv.info.scope.leave(); 1380 } 1381 } 1382 1383 public void visitLabelled(JCLabeledStatement tree) { 1384 // Check that label is not used in an enclosing statement 1385 Env<AttrContext> env1 = env; 1386 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1387 if (env1.tree.hasTag(LABELLED) && 1388 ((JCLabeledStatement) env1.tree).label == tree.label) { 1389 log.error(tree.pos(), 1390 Errors.LabelAlreadyInUse(tree.label)); 1391 break; 1392 } 1393 env1 = env1.next; 1394 } 1395 1396 attribStat(tree.body, env.dup(tree)); 1397 result = null; 1398 } 1399 1400 public void visitSwitch(JCSwitch tree) { 1401 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> { 1402 attribStats(c.stats, caseEnv); 1403 }); 1404 result = null; 1405 } 1406 1407 public void visitSwitchExpression(JCSwitchExpression tree) { 1408 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ? 1409 PolyKind.STANDALONE : PolyKind.POLY; 1410 1411 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1412 //this means we are returning a poly conditional from void-compatible lambda expression 1413 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid)); 1414 result = tree.type = types.createErrorType(resultInfo.pt); 1415 return; 1416 } 1417 1418 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1419 unknownExprInfo : 1420 resultInfo.dup(switchExpressionContext(resultInfo.checkContext)); 1421 1422 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>(); 1423 ListBuffer<Type> caseTypes = new ListBuffer<>(); 1424 1425 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> { 1426 caseEnv.info.breakResult = condInfo; 1427 attribStats(c.stats, caseEnv); 1428 new TreeScanner() { 1429 @Override 1430 public void visitBreak(JCBreak brk) { 1431 if (brk.target == tree) { 1432 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos()); 1433 caseTypes.append(brk.value != null ? brk.value.type : syms.errType); 1434 } 1435 super.visitBreak(brk); 1436 } 1437 1438 @Override public void visitClassDef(JCClassDecl tree) {} 1439 @Override public void visitLambda(JCLambda tree) {} 1440 }.scan(c.stats); 1441 }); 1442 1443 if (tree.cases.isEmpty()) { 1444 log.error(tree.pos(), 1445 Errors.SwitchExpressionEmpty); 1446 } 1447 1448 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt(); 1449 1450 result = tree.type = check(tree, owntype, KindSelector.VAL, resultInfo); 1451 } 1452 //where: 1453 CheckContext switchExpressionContext(CheckContext checkContext) { 1454 return new Check.NestedCheckContext(checkContext) { 1455 //this will use enclosing check context to check compatibility of 1456 //subexpression against target type; if we are in a method check context, 1457 //depending on whether boxing is allowed, we could have incompatibilities 1458 @Override 1459 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1460 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details))); 1461 } 1462 }; 1463 } 1464 1465 private void handleSwitch(JCTree switchTree, 1466 JCExpression selector, 1467 List<JCCase> cases, 1468 BiConsumer<JCCase, Env<AttrContext>> attribCase) { 1469 Type seltype = attribExpr(selector, env); 1470 1471 Env<AttrContext> switchEnv = 1472 env.dup(switchTree, env.info.dup(env.info.scope.dup())); 1473 1474 try { 1475 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1476 boolean stringSwitch = types.isSameType(seltype, syms.stringType); 1477 if (!enumSwitch && !stringSwitch) 1478 seltype = chk.checkType(selector.pos(), seltype, syms.intType); 1479 1480 // Attribute all cases and 1481 // check that there are no duplicate case labels or default clauses. 1482 Set<Object> labels = new HashSet<>(); // The set of case labels. 1483 boolean hasDefault = false; // Is there a default label? 1484 @SuppressWarnings("removal") 1485 CaseKind caseKind = null; 1486 boolean wasError = false; 1487 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) { 1488 JCCase c = l.head; 1489 if (caseKind == null) { 1490 caseKind = c.caseKind; 1491 } else if (caseKind != c.caseKind && !wasError) { 1492 log.error(c.pos(), 1493 Errors.SwitchMixingCaseTypes); 1494 wasError = true; 1495 } 1496 if (c.getExpressions().nonEmpty()) { 1497 for (JCExpression pat : c.getExpressions()) { 1498 if (TreeInfo.isNull(pat)) { 1499 log.error(pat.pos(), 1500 Errors.SwitchNullNotAllowed); 1501 } else if (enumSwitch) { 1502 Symbol sym = enumConstant(pat, seltype); 1503 if (sym == null) { 1504 log.error(pat.pos(), Errors.EnumLabelMustBeUnqualifiedEnum); 1505 } else if (!labels.add(sym)) { 1506 log.error(c.pos(), Errors.DuplicateCaseLabel); 1507 } 1508 } else { 1509 Type pattype = attribExpr(pat, switchEnv, seltype); 1510 if (!pattype.hasTag(ERROR)) { 1511 if (pattype.constValue() == null) { 1512 log.error(pat.pos(), 1513 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq)); 1514 } else if (!labels.add(pattype.constValue())) { 1515 log.error(c.pos(), Errors.DuplicateCaseLabel); 1516 } 1517 } 1518 } 1519 } 1520 } else if (hasDefault) { 1521 log.error(c.pos(), Errors.DuplicateDefaultLabel); 1522 } else { 1523 hasDefault = true; 1524 } 1525 Env<AttrContext> caseEnv = 1526 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1527 try { 1528 attribCase.accept(c, caseEnv); 1529 } finally { 1530 caseEnv.info.scope.leave(); 1531 addVars(c.stats, switchEnv.info.scope); 1532 } 1533 } 1534 } finally { 1535 switchEnv.info.scope.leave(); 1536 } 1537 } 1538 // where 1539 /** Add any variables defined in stats to the switch scope. */ 1540 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1541 for (;stats.nonEmpty(); stats = stats.tail) { 1542 JCTree stat = stats.head; 1543 if (stat.hasTag(VARDEF)) 1544 switchScope.enter(((JCVariableDecl) stat).sym); 1545 } 1546 } 1547 // where 1548 /** Return the selected enumeration constant symbol, or null. */ 1549 private Symbol enumConstant(JCTree tree, Type enumType) { 1550 if (tree.hasTag(IDENT)) { 1551 JCIdent ident = (JCIdent)tree; 1552 Name name = ident.name; 1553 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1554 if (sym.kind == VAR) { 1555 Symbol s = ident.sym = sym; 1556 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1557 ident.type = s.type; 1558 return ((s.flags_field & Flags.ENUM) == 0) 1559 ? null : s; 1560 } 1561 } 1562 } 1563 return null; 1564 } 1565 1566 public void visitSynchronized(JCSynchronized tree) { 1567 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1568 attribStat(tree.body, env); 1569 result = null; 1570 } 1571 1572 public void visitTry(JCTry tree) { 1573 // Create a new local environment with a local 1574 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1575 try { 1576 boolean isTryWithResource = tree.resources.nonEmpty(); 1577 // Create a nested environment for attributing the try block if needed 1578 Env<AttrContext> tryEnv = isTryWithResource ? 1579 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1580 localEnv; 1581 try { 1582 // Attribute resource declarations 1583 for (JCTree resource : tree.resources) { 1584 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1585 @Override 1586 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1587 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details))); 1588 } 1589 }; 1590 ResultInfo twrResult = 1591 new ResultInfo(KindSelector.VAR, 1592 syms.autoCloseableType, 1593 twrContext); 1594 if (resource.hasTag(VARDEF)) { 1595 attribStat(resource, tryEnv); 1596 twrResult.check(resource, resource.type); 1597 1598 //check that resource type cannot throw InterruptedException 1599 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1600 1601 VarSymbol var = ((JCVariableDecl) resource).sym; 1602 var.setData(ElementKind.RESOURCE_VARIABLE); 1603 } else { 1604 attribTree(resource, tryEnv, twrResult); 1605 } 1606 } 1607 // Attribute body 1608 attribStat(tree.body, tryEnv); 1609 } finally { 1610 if (isTryWithResource) 1611 tryEnv.info.scope.leave(); 1612 } 1613 1614 // Attribute catch clauses 1615 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1616 JCCatch c = l.head; 1617 Env<AttrContext> catchEnv = 1618 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1619 try { 1620 Type ctype = attribStat(c.param, catchEnv); 1621 if (TreeInfo.isMultiCatch(c)) { 1622 //multi-catch parameter is implicitly marked as final 1623 c.param.sym.flags_field |= FINAL | UNION; 1624 } 1625 if (c.param.sym.kind == VAR) { 1626 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1627 } 1628 chk.checkType(c.param.vartype.pos(), 1629 chk.checkClassType(c.param.vartype.pos(), ctype), 1630 syms.throwableType); 1631 attribStat(c.body, catchEnv); 1632 } finally { 1633 catchEnv.info.scope.leave(); 1634 } 1635 } 1636 1637 // Attribute finalizer 1638 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1639 result = null; 1640 } 1641 finally { 1642 localEnv.info.scope.leave(); 1643 } 1644 } 1645 1646 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1647 if (!resource.isErroneous() && 1648 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1649 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1650 Symbol close = syms.noSymbol; 1651 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1652 try { 1653 close = rs.resolveQualifiedMethod(pos, 1654 env, 1655 types.skipTypeVars(resource, false), 1656 names.close, 1657 List.nil(), 1658 List.nil()); 1659 } 1660 finally { 1661 log.popDiagnosticHandler(discardHandler); 1662 } 1663 if (close.kind == MTH && 1664 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1665 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1666 env.info.lint.isEnabled(LintCategory.TRY)) { 1667 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource)); 1668 } 1669 } 1670 } 1671 1672 public void visitConditional(JCConditional tree) { 1673 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1674 1675 tree.polyKind = (!allowPoly || 1676 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1677 isBooleanOrNumeric(env, tree)) ? 1678 PolyKind.STANDALONE : PolyKind.POLY; 1679 1680 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1681 //this means we are returning a poly conditional from void-compatible lambda expression 1682 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid)); 1683 result = tree.type = types.createErrorType(resultInfo.pt); 1684 return; 1685 } 1686 1687 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1688 unknownExprInfo : 1689 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1690 1691 Type truetype = attribTree(tree.truepart, env, condInfo); 1692 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1693 1694 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? 1695 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()), 1696 List.of(truetype, falsetype)) : pt(); 1697 if (condtype.constValue() != null && 1698 truetype.constValue() != null && 1699 falsetype.constValue() != null && 1700 !owntype.hasTag(NONE)) { 1701 //constant folding 1702 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1703 } 1704 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1705 } 1706 //where 1707 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1708 switch (tree.getTag()) { 1709 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1710 ((JCLiteral)tree).typetag == BOOLEAN || 1711 ((JCLiteral)tree).typetag == BOT; 1712 case LAMBDA: case REFERENCE: return false; 1713 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1714 case CONDEXPR: 1715 JCConditional condTree = (JCConditional)tree; 1716 return isBooleanOrNumeric(env, condTree.truepart) && 1717 isBooleanOrNumeric(env, condTree.falsepart); 1718 case APPLY: 1719 JCMethodInvocation speculativeMethodTree = 1720 (JCMethodInvocation)deferredAttr.attribSpeculative( 1721 tree, env, unknownExprInfo, 1722 argumentAttr.withLocalCacheContext()); 1723 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1724 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1725 env.enclClass.type : 1726 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1727 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1728 return primitiveOrBoxed(owntype); 1729 case NEWCLASS: 1730 JCExpression className = 1731 removeClassParams.translate(((JCNewClass)tree).clazz); 1732 JCExpression speculativeNewClassTree = 1733 (JCExpression)deferredAttr.attribSpeculative( 1734 className, env, unknownTypeInfo, 1735 argumentAttr.withLocalCacheContext()); 1736 return primitiveOrBoxed(speculativeNewClassTree.type); 1737 default: 1738 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo, 1739 argumentAttr.withLocalCacheContext()).type; 1740 return primitiveOrBoxed(speculativeType); 1741 } 1742 } 1743 //where 1744 boolean primitiveOrBoxed(Type t) { 1745 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1746 } 1747 1748 TreeTranslator removeClassParams = new TreeTranslator() { 1749 @Override 1750 public void visitTypeApply(JCTypeApply tree) { 1751 result = translate(tree.clazz); 1752 } 1753 }; 1754 1755 CheckContext conditionalContext(CheckContext checkContext) { 1756 return new Check.NestedCheckContext(checkContext) { 1757 //this will use enclosing check context to check compatibility of 1758 //subexpression against target type; if we are in a method check context, 1759 //depending on whether boxing is allowed, we could have incompatibilities 1760 @Override 1761 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1762 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details))); 1763 } 1764 }; 1765 } 1766 1767 /** Compute the type of a conditional expression, after 1768 * checking that it exists. See JLS 15.25. Does not take into 1769 * account the special case where condition and both arms 1770 * are constants. 1771 * 1772 * @param pos The source position to be used for error 1773 * diagnostics. 1774 * @param thentype The type of the expression's then-part. 1775 * @param elsetype The type of the expression's else-part. 1776 */ 1777 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) { 1778 if (condTypes.isEmpty()) { 1779 return syms.objectType; //TODO: how to handle? 1780 } 1781 if (condTypes.size() == 1) { 1782 return condTypes.head; 1783 } 1784 Type first = condTypes.head; 1785 // If same type, that is the result 1786 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t))) 1787 return first.baseType(); 1788 1789 List<Type> unboxedTypes = condTypes.stream() 1790 .map(t -> t.isPrimitive() ? t : types.unboxedType(t)) 1791 .collect(List.collector()); 1792 1793 // Otherwise, if both arms can be converted to a numeric 1794 // type, return the least numeric type that fits both arms 1795 // (i.e. return larger of the two, or return int if one 1796 // arm is short, the other is char). 1797 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) { 1798 // If one arm has an integer subrange type (i.e., byte, 1799 // short, or char), and the other is an integer constant 1800 // that fits into the subrange, return the subrange type. 1801 for (Type type : unboxedTypes) { 1802 if (!type.getTag().isStrictSubRangeOf(INT)) { 1803 continue; 1804 } 1805 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type))) 1806 return type.baseType(); 1807 } 1808 1809 for (TypeTag tag : primitiveTags) { 1810 Type candidate = syms.typeOfTag[tag.ordinal()]; 1811 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) { 1812 return candidate; 1813 } 1814 } 1815 } 1816 1817 // Those were all the cases that could result in a primitive 1818 condTypes = condTypes.stream() 1819 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t) 1820 .collect(List.collector()); 1821 1822 for (Type type : condTypes) { 1823 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type))) 1824 return type.baseType(); 1825 } 1826 1827 Iterator<DiagnosticPosition> posIt = positions.iterator(); 1828 1829 condTypes = condTypes.stream() 1830 .map(t -> chk.checkNonVoid(posIt.next(), t)) 1831 .collect(List.collector()); 1832 1833 // both are known to be reference types. The result is 1834 // lub(thentype,elsetype). This cannot fail, as it will 1835 // always be possible to infer "Object" if nothing better. 1836 return types.lub(condTypes.stream().map(t -> t.baseType()).collect(List.collector())); 1837 } 1838 1839 final static TypeTag[] primitiveTags = new TypeTag[]{ 1840 BYTE, 1841 CHAR, 1842 SHORT, 1843 INT, 1844 LONG, 1845 FLOAT, 1846 DOUBLE, 1847 BOOLEAN, 1848 }; 1849 1850 public void visitIf(JCIf tree) { 1851 attribExpr(tree.cond, env, syms.booleanType); 1852 attribStat(tree.thenpart, env); 1853 if (tree.elsepart != null) 1854 attribStat(tree.elsepart, env); 1855 chk.checkEmptyIf(tree); 1856 result = null; 1857 } 1858 1859 public void visitExec(JCExpressionStatement tree) { 1860 //a fresh environment is required for 292 inference to work properly --- 1861 //see Infer.instantiatePolymorphicSignatureInstance() 1862 Env<AttrContext> localEnv = env.dup(tree); 1863 attribExpr(tree.expr, localEnv); 1864 result = null; 1865 } 1866 1867 public void visitBreak(JCBreak tree) { 1868 if (env.info.breakResult != null) { 1869 if (tree.value == null) { 1870 tree.target = findJumpTarget(tree.pos(), tree.getTag(), null, env); 1871 if (tree.target.hasTag(SWITCH_EXPRESSION)) { 1872 log.error(tree.pos(), Errors.BreakMissingValue); 1873 } 1874 } else { 1875 if (env.info.breakResult.pt.hasTag(VOID)) { 1876 //can happen? 1877 env.info.breakResult.checkContext.report(tree.value.pos(), 1878 diags.fragment(Fragments.UnexpectedRetVal)); 1879 } 1880 boolean attribute = true; 1881 if (tree.value.hasTag(IDENT)) { 1882 //disambiguate break <LABEL> and break <ident-as-an-expression>: 1883 Name label = ((JCIdent) tree.value).name; 1884 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tree.getTag(), label, env); 1885 1886 if (jumpTarget.fst != null) { 1887 JCTree speculative = deferredAttr.attribSpeculative(tree.value, env, unknownExprInfo); 1888 if (!speculative.type.hasTag(ERROR)) { 1889 log.error(tree.pos(), Errors.BreakAmbiguousTarget(label)); 1890 if (jumpTarget.snd == null) { 1891 tree.target = jumpTarget.fst; 1892 attribute = false; 1893 } else { 1894 //nothing 1895 } 1896 } else { 1897 if (jumpTarget.snd != null) { 1898 log.error(tree.pos(), jumpTarget.snd); 1899 } 1900 tree.target = jumpTarget.fst; 1901 attribute = false; 1902 } 1903 } 1904 } 1905 if (attribute) { 1906 attribTree(tree.value, env, env.info.breakResult); 1907 JCTree immediateTarget = findJumpTarget(tree.pos(), tree.getTag(), null, env); 1908 if (immediateTarget.getTag() != SWITCH_EXPRESSION) { 1909 log.error(tree.pos(), Errors.BreakExprNotImmediate); 1910 Env<AttrContext> env1 = env; 1911 while (env1 != null && env1.tree.getTag() != SWITCH_EXPRESSION) { 1912 env1 = env1.next; 1913 } 1914 Assert.checkNonNull(env1); 1915 tree.target = env1.tree; 1916 } else { 1917 tree.target = immediateTarget; 1918 } 1919 } 1920 } 1921 } else { 1922 if (tree.value == null || tree.value.hasTag(IDENT)) { 1923 Name label = tree.value != null ? ((JCIdent) tree.value).name : null; 1924 tree.target = findJumpTarget(tree.pos(), tree.getTag(), label, env); 1925 } else { 1926 log.error(tree.pos(), Errors.BreakComplexValueNoSwitchExpression); 1927 attribTree(tree.value, env, unknownExprInfo); 1928 } 1929 } 1930 result = null; 1931 } 1932 1933 public void visitContinue(JCContinue tree) { 1934 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1935 result = null; 1936 } 1937 //where 1938 /** Return the target of a break or continue statement, if it exists, 1939 * report an error if not. 1940 * Note: The target of a labelled break or continue is the 1941 * (non-labelled) statement tree referred to by the label, 1942 * not the tree representing the labelled statement itself. 1943 * 1944 * @param pos The position to be used for error diagnostics 1945 * @param tag The tag of the jump statement. This is either 1946 * Tree.BREAK or Tree.CONTINUE. 1947 * @param label The label of the jump statement, or null if no 1948 * label is given. 1949 * @param env The environment current at the jump statement. 1950 */ 1951 private JCTree findJumpTarget(DiagnosticPosition pos, 1952 JCTree.Tag tag, 1953 Name label, 1954 Env<AttrContext> env) { 1955 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env); 1956 1957 if (jumpTarget.snd != null) { 1958 log.error(pos, jumpTarget.snd); 1959 } 1960 1961 return jumpTarget.fst; 1962 } 1963 /** Return the target of a break or continue statement, if it exists, 1964 * report an error if not. 1965 * Note: The target of a labelled break or continue is the 1966 * (non-labelled) statement tree referred to by the label, 1967 * not the tree representing the labelled statement itself. 1968 * 1969 * @param tag The tag of the jump statement. This is either 1970 * Tree.BREAK or Tree.CONTINUE. 1971 * @param label The label of the jump statement, or null if no 1972 * label is given. 1973 * @param env The environment current at the jump statement. 1974 */ 1975 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag, 1976 Name label, 1977 Env<AttrContext> env) { 1978 // Search environments outwards from the point of jump. 1979 Env<AttrContext> env1 = env; 1980 JCDiagnostic.Error pendingError = null; 1981 LOOP: 1982 while (env1 != null) { 1983 switch (env1.tree.getTag()) { 1984 case LABELLED: 1985 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1986 if (label == labelled.label) { 1987 // If jump is a continue, check that target is a loop. 1988 if (tag == CONTINUE) { 1989 if (!labelled.body.hasTag(DOLOOP) && 1990 !labelled.body.hasTag(WHILELOOP) && 1991 !labelled.body.hasTag(FORLOOP) && 1992 !labelled.body.hasTag(FOREACHLOOP)) { 1993 pendingError = Errors.NotLoopLabel(label); 1994 } 1995 // Found labelled statement target, now go inwards 1996 // to next non-labelled tree. 1997 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError); 1998 } else { 1999 return Pair.of(labelled, pendingError); 2000 } 2001 } 2002 break; 2003 case DOLOOP: 2004 case WHILELOOP: 2005 case FORLOOP: 2006 case FOREACHLOOP: 2007 if (label == null) return Pair.of(env1.tree, pendingError); 2008 break; 2009 case SWITCH: 2010 if (label == null && tag == BREAK) return Pair.of(env1.tree, null); 2011 break; 2012 case SWITCH_EXPRESSION: 2013 if (tag == BREAK) { 2014 if (label == null) { 2015 return Pair.of(env1.tree, null); 2016 } else { 2017 pendingError = Errors.BreakOutsideSwitchExpression; 2018 } 2019 } else { 2020 pendingError = Errors.ContinueOutsideSwitchExpression; 2021 } 2022 break; 2023 case LAMBDA: 2024 case METHODDEF: 2025 case CLASSDEF: 2026 break LOOP; 2027 default: 2028 } 2029 env1 = env1.next; 2030 } 2031 if (label != null) 2032 return Pair.of(null, Errors.UndefLabel(label)); 2033 else if (tag == CONTINUE) 2034 return Pair.of(null, Errors.ContOutsideLoop); 2035 else 2036 return Pair.of(null, Errors.BreakOutsideSwitchLoop); 2037 } 2038 2039 public void visitReturn(JCReturn tree) { 2040 // Check that there is an enclosing method which is 2041 // nested within than the enclosing class. 2042 if (env.info.returnResult == null) { 2043 log.error(tree.pos(), Errors.RetOutsideMeth); 2044 } else if (env.info.breakResult != null) { 2045 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression); 2046 } else { 2047 // Attribute return expression, if it exists, and check that 2048 // it conforms to result type of enclosing method. 2049 if (tree.expr != null) { 2050 if (env.info.returnResult.pt.hasTag(VOID)) { 2051 env.info.returnResult.checkContext.report(tree.expr.pos(), 2052 diags.fragment(Fragments.UnexpectedRetVal)); 2053 } 2054 attribTree(tree.expr, env, env.info.returnResult); 2055 } else if (!env.info.returnResult.pt.hasTag(VOID) && 2056 !env.info.returnResult.pt.hasTag(NONE)) { 2057 env.info.returnResult.checkContext.report(tree.pos(), 2058 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt))); 2059 } 2060 } 2061 result = null; 2062 } 2063 2064 public void visitThrow(JCThrow tree) { 2065 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 2066 if (allowPoly) { 2067 chk.checkType(tree, owntype, syms.throwableType); 2068 } 2069 result = null; 2070 } 2071 2072 public void visitAssert(JCAssert tree) { 2073 attribExpr(tree.cond, env, syms.booleanType); 2074 if (tree.detail != null) { 2075 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 2076 } 2077 result = null; 2078 } 2079 2080 /** Visitor method for method invocations. 2081 * NOTE: The method part of an application will have in its type field 2082 * the return type of the method, not the method's type itself! 2083 */ 2084 public void visitApply(JCMethodInvocation tree) { 2085 // The local environment of a method application is 2086 // a new environment nested in the current one. 2087 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 2088 2089 // The types of the actual method arguments. 2090 List<Type> argtypes; 2091 2092 // The types of the actual method type arguments. 2093 List<Type> typeargtypes = null; 2094 2095 Name methName = TreeInfo.name(tree.meth); 2096 2097 boolean isConstructorCall = 2098 methName == names._this || methName == names._super; 2099 2100 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2101 if (isConstructorCall) { 2102 // We are seeing a ...this(...) or ...super(...) call. 2103 // Check that this is the first statement in a constructor. 2104 if (checkFirstConstructorStat(tree, env)) { 2105 2106 // Record the fact 2107 // that this is a constructor call (using isSelfCall). 2108 localEnv.info.isSelfCall = true; 2109 2110 // Attribute arguments, yielding list of argument types. 2111 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 2112 argtypes = argtypesBuf.toList(); 2113 typeargtypes = attribTypes(tree.typeargs, localEnv); 2114 2115 // Variable `site' points to the class in which the called 2116 // constructor is defined. 2117 Type site = env.enclClass.sym.type; 2118 if (methName == names._super) { 2119 if (site == syms.objectType) { 2120 log.error(tree.meth.pos(), Errors.NoSuperclass(site)); 2121 site = types.createErrorType(syms.objectType); 2122 } else { 2123 site = types.supertype(site); 2124 } 2125 } 2126 2127 if (site.hasTag(CLASS)) { 2128 Type encl = site.getEnclosingType(); 2129 while (encl != null && encl.hasTag(TYPEVAR)) 2130 encl = encl.getUpperBound(); 2131 if (encl.hasTag(CLASS)) { 2132 // we are calling a nested class 2133 2134 if (tree.meth.hasTag(SELECT)) { 2135 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 2136 2137 // We are seeing a prefixed call, of the form 2138 // <expr>.super(...). 2139 // Check that the prefix expression conforms 2140 // to the outer instance type of the class. 2141 chk.checkRefType(qualifier.pos(), 2142 attribExpr(qualifier, localEnv, 2143 encl)); 2144 } else if (methName == names._super) { 2145 // qualifier omitted; check for existence 2146 // of an appropriate implicit qualifier. 2147 rs.resolveImplicitThis(tree.meth.pos(), 2148 localEnv, site, true); 2149 } 2150 } else if (tree.meth.hasTag(SELECT)) { 2151 log.error(tree.meth.pos(), 2152 Errors.IllegalQualNotIcls(site.tsym)); 2153 } 2154 2155 // if we're calling a java.lang.Enum constructor, 2156 // prefix the implicit String and int parameters 2157 if (site.tsym == syms.enumSym) 2158 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 2159 2160 // Resolve the called constructor under the assumption 2161 // that we are referring to a superclass instance of the 2162 // current instance (JLS ???). 2163 boolean selectSuperPrev = localEnv.info.selectSuper; 2164 localEnv.info.selectSuper = true; 2165 localEnv.info.pendingResolutionPhase = null; 2166 Symbol sym = rs.resolveConstructor( 2167 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 2168 localEnv.info.selectSuper = selectSuperPrev; 2169 2170 // Set method symbol to resolved constructor... 2171 TreeInfo.setSymbol(tree.meth, sym); 2172 2173 // ...and check that it is legal in the current context. 2174 // (this will also set the tree's type) 2175 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 2176 checkId(tree.meth, site, sym, localEnv, 2177 new ResultInfo(kind, mpt)); 2178 } 2179 // Otherwise, `site' is an error type and we do nothing 2180 } 2181 result = tree.type = syms.voidType; 2182 } else { 2183 // Otherwise, we are seeing a regular method call. 2184 // Attribute the arguments, yielding list of argument types, ... 2185 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2186 argtypes = argtypesBuf.toList(); 2187 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 2188 2189 // ... and attribute the method using as a prototype a methodtype 2190 // whose formal argument types is exactly the list of actual 2191 // arguments (this will also set the method symbol). 2192 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 2193 localEnv.info.pendingResolutionPhase = null; 2194 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 2195 2196 // Compute the result type. 2197 Type restype = mtype.getReturnType(); 2198 if (restype.hasTag(WILDCARD)) 2199 throw new AssertionError(mtype); 2200 2201 Type qualifier = (tree.meth.hasTag(SELECT)) 2202 ? ((JCFieldAccess) tree.meth).selected.type 2203 : env.enclClass.sym.type; 2204 Symbol msym = TreeInfo.symbol(tree.meth); 2205 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 2206 2207 chk.checkRefTypes(tree.typeargs, typeargtypes); 2208 2209 // Check that value of resulting type is admissible in the 2210 // current context. Also, capture the return type 2211 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 2212 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 2213 } 2214 chk.validate(tree.typeargs, localEnv); 2215 } 2216 //where 2217 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 2218 if (msym != null && 2219 msym.owner == syms.objectType.tsym && 2220 methodName == names.getClass && 2221 argtypes.isEmpty()) { 2222 // as a special case, x.getClass() has type Class<? extends |X|> 2223 return new ClassType(restype.getEnclosingType(), 2224 List.of(new WildcardType(types.erasure(qualifierType), 2225 BoundKind.EXTENDS, 2226 syms.boundClass)), 2227 restype.tsym, 2228 restype.getMetadata()); 2229 } else if (msym != null && 2230 msym.owner == syms.arrayClass && 2231 methodName == names.clone && 2232 types.isArray(qualifierType)) { 2233 // as a special case, array.clone() has a result that is 2234 // the same as static type of the array being cloned 2235 return qualifierType; 2236 } else { 2237 return restype; 2238 } 2239 } 2240 2241 /** Check that given application node appears as first statement 2242 * in a constructor call. 2243 * @param tree The application node 2244 * @param env The environment current at the application. 2245 */ 2246 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 2247 JCMethodDecl enclMethod = env.enclMethod; 2248 if (enclMethod != null && enclMethod.name == names.init) { 2249 JCBlock body = enclMethod.body; 2250 if (body.stats.head.hasTag(EXEC) && 2251 ((JCExpressionStatement) body.stats.head).expr == tree) 2252 return true; 2253 } 2254 log.error(tree.pos(), 2255 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth))); 2256 return false; 2257 } 2258 2259 /** Obtain a method type with given argument types. 2260 */ 2261 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 2262 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass); 2263 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 2264 } 2265 2266 public void visitNewClass(final JCNewClass tree) { 2267 Type owntype = types.createErrorType(tree.type); 2268 2269 // The local environment of a class creation is 2270 // a new environment nested in the current one. 2271 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 2272 2273 // The anonymous inner class definition of the new expression, 2274 // if one is defined by it. 2275 JCClassDecl cdef = tree.def; 2276 2277 // If enclosing class is given, attribute it, and 2278 // complete class name to be fully qualified 2279 JCExpression clazz = tree.clazz; // Class field following new 2280 JCExpression clazzid; // Identifier in class field 2281 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 2282 annoclazzid = null; 2283 2284 if (clazz.hasTag(TYPEAPPLY)) { 2285 clazzid = ((JCTypeApply) clazz).clazz; 2286 if (clazzid.hasTag(ANNOTATED_TYPE)) { 2287 annoclazzid = (JCAnnotatedType) clazzid; 2288 clazzid = annoclazzid.underlyingType; 2289 } 2290 } else { 2291 if (clazz.hasTag(ANNOTATED_TYPE)) { 2292 annoclazzid = (JCAnnotatedType) clazz; 2293 clazzid = annoclazzid.underlyingType; 2294 } else { 2295 clazzid = clazz; 2296 } 2297 } 2298 2299 JCExpression clazzid1 = clazzid; // The same in fully qualified form 2300 2301 if (tree.encl != null) { 2302 // We are seeing a qualified new, of the form 2303 // <expr>.new C <...> (...) ... 2304 // In this case, we let clazz stand for the name of the 2305 // allocated class C prefixed with the type of the qualifier 2306 // expression, so that we can 2307 // resolve it with standard techniques later. I.e., if 2308 // <expr> has type T, then <expr>.new C <...> (...) 2309 // yields a clazz T.C. 2310 Type encltype = chk.checkRefType(tree.encl.pos(), 2311 attribExpr(tree.encl, env)); 2312 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2313 // from expr to the combined type, or not? Yes, do this. 2314 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2315 ((JCIdent) clazzid).name); 2316 2317 EndPosTable endPosTable = this.env.toplevel.endPositions; 2318 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2319 if (clazz.hasTag(ANNOTATED_TYPE)) { 2320 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2321 List<JCAnnotation> annos = annoType.annotations; 2322 2323 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2324 clazzid1 = make.at(tree.pos). 2325 TypeApply(clazzid1, 2326 ((JCTypeApply) clazz).arguments); 2327 } 2328 2329 clazzid1 = make.at(tree.pos). 2330 AnnotatedType(annos, clazzid1); 2331 } else if (clazz.hasTag(TYPEAPPLY)) { 2332 clazzid1 = make.at(tree.pos). 2333 TypeApply(clazzid1, 2334 ((JCTypeApply) clazz).arguments); 2335 } 2336 2337 clazz = clazzid1; 2338 } 2339 2340 // Attribute clazz expression and store 2341 // symbol + type back into the attributed tree. 2342 Type clazztype; 2343 2344 try { 2345 env.info.isNewClass = true; 2346 clazztype = TreeInfo.isEnumInit(env.tree) ? 2347 attribIdentAsEnumType(env, (JCIdent)clazz) : 2348 attribType(clazz, env); 2349 } finally { 2350 env.info.isNewClass = false; 2351 } 2352 2353 clazztype = chk.checkDiamond(tree, clazztype); 2354 chk.validate(clazz, localEnv); 2355 if (tree.encl != null) { 2356 // We have to work in this case to store 2357 // symbol + type back into the attributed tree. 2358 tree.clazz.type = clazztype; 2359 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2360 clazzid.type = ((JCIdent) clazzid).sym.type; 2361 if (annoclazzid != null) { 2362 annoclazzid.type = clazzid.type; 2363 } 2364 if (!clazztype.isErroneous()) { 2365 if (cdef != null && clazztype.tsym.isInterface()) { 2366 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew); 2367 } else if (clazztype.tsym.isStatic()) { 2368 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym)); 2369 } 2370 } 2371 } else if (!clazztype.tsym.isInterface() && 2372 clazztype.getEnclosingType().hasTag(CLASS)) { 2373 // Check for the existence of an apropos outer instance 2374 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2375 } 2376 2377 // Attribute constructor arguments. 2378 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2379 final KindSelector pkind = 2380 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2381 List<Type> argtypes = argtypesBuf.toList(); 2382 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2383 2384 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) { 2385 // Enums may not be instantiated except implicitly 2386 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2387 (!env.tree.hasTag(VARDEF) || 2388 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2389 ((JCVariableDecl) env.tree).init != tree)) 2390 log.error(tree.pos(), Errors.EnumCantBeInstantiated); 2391 2392 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2393 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2394 boolean skipNonDiamondPath = false; 2395 // Check that class is not abstract 2396 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2397 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2398 log.error(tree.pos(), 2399 Errors.AbstractCantBeInstantiated(clazztype.tsym)); 2400 skipNonDiamondPath = true; 2401 } else if (cdef != null && clazztype.tsym.isInterface()) { 2402 // Check that no constructor arguments are given to 2403 // anonymous classes implementing an interface 2404 if (!argtypes.isEmpty()) 2405 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs); 2406 2407 if (!typeargtypes.isEmpty()) 2408 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs); 2409 2410 // Error recovery: pretend no arguments were supplied. 2411 argtypes = List.nil(); 2412 typeargtypes = List.nil(); 2413 skipNonDiamondPath = true; 2414 } 2415 if (TreeInfo.isDiamond(tree)) { 2416 ClassType site = new ClassType(clazztype.getEnclosingType(), 2417 clazztype.tsym.type.getTypeArguments(), 2418 clazztype.tsym, 2419 clazztype.getMetadata()); 2420 2421 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2422 diamondEnv.info.selectSuper = cdef != null; 2423 diamondEnv.info.pendingResolutionPhase = null; 2424 2425 //if the type of the instance creation expression is a class type 2426 //apply method resolution inference (JLS 15.12.2.7). The return type 2427 //of the resolved constructor will be a partially instantiated type 2428 Symbol constructor = rs.resolveDiamond(tree.pos(), 2429 diamondEnv, 2430 site, 2431 argtypes, 2432 typeargtypes); 2433 tree.constructor = constructor.baseSymbol(); 2434 2435 final TypeSymbol csym = clazztype.tsym; 2436 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2437 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2438 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2439 constructorType = checkId(tree, site, 2440 constructor, 2441 diamondEnv, 2442 diamondResult); 2443 2444 tree.clazz.type = types.createErrorType(clazztype); 2445 if (!constructorType.isErroneous()) { 2446 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2447 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2448 } 2449 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2450 } 2451 2452 // Resolve the called constructor under the assumption 2453 // that we are referring to a superclass instance of the 2454 // current instance (JLS ???). 2455 else if (!skipNonDiamondPath) { 2456 //the following code alters some of the fields in the current 2457 //AttrContext - hence, the current context must be dup'ed in 2458 //order to avoid downstream failures 2459 Env<AttrContext> rsEnv = localEnv.dup(tree); 2460 rsEnv.info.selectSuper = cdef != null; 2461 rsEnv.info.pendingResolutionPhase = null; 2462 tree.constructor = rs.resolveConstructor( 2463 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2464 if (cdef == null) { //do not check twice! 2465 tree.constructorType = checkId(tree, 2466 clazztype, 2467 tree.constructor, 2468 rsEnv, 2469 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2470 if (rsEnv.info.lastResolveVarargs()) 2471 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2472 } 2473 } 2474 2475 if (cdef != null) { 2476 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2477 return; 2478 } 2479 2480 if (tree.constructor != null && tree.constructor.kind == MTH) 2481 owntype = clazztype; 2482 } 2483 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2484 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2485 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2486 //we need to wait for inference to finish and then replace inference vars in the constructor type 2487 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2488 instantiatedContext -> { 2489 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2490 }); 2491 } 2492 chk.validate(tree.typeargs, localEnv); 2493 } 2494 2495 // where 2496 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2497 JCClassDecl cdef, Env<AttrContext> localEnv, 2498 List<Type> argtypes, List<Type> typeargtypes, 2499 KindSelector pkind) { 2500 // We are seeing an anonymous class instance creation. 2501 // In this case, the class instance creation 2502 // expression 2503 // 2504 // E.new <typeargs1>C<typargs2>(args) { ... } 2505 // 2506 // is represented internally as 2507 // 2508 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2509 // 2510 // This expression is then *transformed* as follows: 2511 // 2512 // (1) add an extends or implements clause 2513 // (2) add a constructor. 2514 // 2515 // For instance, if C is a class, and ET is the type of E, 2516 // the expression 2517 // 2518 // E.new <typeargs1>C<typargs2>(args) { ... } 2519 // 2520 // is translated to (where X is a fresh name and typarams is the 2521 // parameter list of the super constructor): 2522 // 2523 // new <typeargs1>X(<*nullchk*>E, args) where 2524 // X extends C<typargs2> { 2525 // <typarams> X(ET e, args) { 2526 // e.<typeargs1>super(args) 2527 // } 2528 // ... 2529 // } 2530 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2531 final boolean isDiamond = TreeInfo.isDiamond(tree); 2532 if (isDiamond 2533 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2534 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2535 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2536 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2537 instantiatedContext -> { 2538 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2539 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2540 ResultInfo prevResult = this.resultInfo; 2541 try { 2542 this.resultInfo = resultInfoForClassDefinition; 2543 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2544 localEnv, argtypes, typeargtypes, pkind); 2545 } finally { 2546 this.resultInfo = prevResult; 2547 } 2548 }); 2549 } else { 2550 if (isDiamond && clazztype.hasTag(CLASS)) { 2551 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2552 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2553 // One or more types inferred in the previous steps is non-denotable. 2554 Fragment fragment = Diamond(clazztype.tsym); 2555 log.error(tree.clazz.pos(), 2556 Errors.CantApplyDiamond1( 2557 fragment, 2558 invalidDiamondArgs.size() > 1 ? 2559 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2560 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2561 } 2562 // For <>(){}, inferred types must also be accessible. 2563 for (Type t : clazztype.getTypeArguments()) { 2564 rs.checkAccessibleType(env, t); 2565 } 2566 } 2567 2568 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2569 // false for isInterface call even when the original type is an interface. 2570 boolean implementing = clazztype.tsym.isInterface() || 2571 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) && 2572 clazztype.getOriginalType().tsym.isInterface(); 2573 2574 if (implementing) { 2575 cdef.implementing = List.of(clazz); 2576 } else { 2577 cdef.extending = clazz; 2578 } 2579 2580 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2581 isSerializable(clazztype)) { 2582 localEnv.info.isSerializable = true; 2583 } 2584 2585 attribStat(cdef, localEnv); 2586 2587 List<Type> finalargtypes; 2588 // If an outer instance is given, 2589 // prefix it to the constructor arguments 2590 // and delete it from the new expression 2591 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2592 finalargtypes = argtypes.prepend(tree.encl.type); 2593 } else { 2594 finalargtypes = argtypes; 2595 } 2596 2597 // Reassign clazztype and recompute constructor. As this necessarily involves 2598 // another attribution pass for deferred types in the case of <>, replicate 2599 // them. Original arguments have right decorations already. 2600 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2601 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2602 } 2603 2604 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type) 2605 : cdef.sym.type; 2606 Symbol sym = tree.constructor = rs.resolveConstructor( 2607 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2608 Assert.check(!sym.kind.isResolutionError()); 2609 tree.constructor = sym; 2610 tree.constructorType = checkId(tree, 2611 clazztype, 2612 tree.constructor, 2613 localEnv, 2614 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2615 } 2616 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2617 clazztype : types.createErrorType(tree.type); 2618 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2619 chk.validate(tree.typeargs, localEnv); 2620 } 2621 2622 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2623 return new Check.NestedCheckContext(checkContext) { 2624 @Override 2625 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2626 enclosingContext.report(clazz.clazz, 2627 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details))); 2628 } 2629 }; 2630 } 2631 2632 /** Make an attributed null check tree. 2633 */ 2634 public JCExpression makeNullCheck(JCExpression arg) { 2635 // optimization: new Outer() can never be null; skip null check 2636 if (arg.getTag() == NEWCLASS) 2637 return arg; 2638 // optimization: X.this is never null; skip null check 2639 Name name = TreeInfo.name(arg); 2640 if (name == names._this || name == names._super) return arg; 2641 2642 JCTree.Tag optag = NULLCHK; 2643 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2644 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2645 tree.type = arg.type; 2646 return tree; 2647 } 2648 2649 public void visitNewArray(JCNewArray tree) { 2650 Type owntype = types.createErrorType(tree.type); 2651 Env<AttrContext> localEnv = env.dup(tree); 2652 Type elemtype; 2653 if (tree.elemtype != null) { 2654 elemtype = attribType(tree.elemtype, localEnv); 2655 chk.validate(tree.elemtype, localEnv); 2656 owntype = elemtype; 2657 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2658 attribExpr(l.head, localEnv, syms.intType); 2659 owntype = new ArrayType(owntype, syms.arrayClass); 2660 } 2661 } else { 2662 // we are seeing an untyped aggregate { ... } 2663 // this is allowed only if the prototype is an array 2664 if (pt().hasTag(ARRAY)) { 2665 elemtype = types.elemtype(pt()); 2666 } else { 2667 if (!pt().hasTag(ERROR) && 2668 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 2669 log.error(tree.pos(), 2670 Errors.IllegalInitializerForType(pt())); 2671 } 2672 elemtype = types.createErrorType(pt()); 2673 } 2674 } 2675 if (tree.elems != null) { 2676 attribExprs(tree.elems, localEnv, elemtype); 2677 owntype = new ArrayType(elemtype, syms.arrayClass); 2678 } 2679 if (!types.isReifiable(elemtype)) 2680 log.error(tree.pos(), Errors.GenericArrayCreation); 2681 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2682 } 2683 2684 /* 2685 * A lambda expression can only be attributed when a target-type is available. 2686 * In addition, if the target-type is that of a functional interface whose 2687 * descriptor contains inference variables in argument position the lambda expression 2688 * is 'stuck' (see DeferredAttr). 2689 */ 2690 @Override 2691 public void visitLambda(final JCLambda that) { 2692 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2693 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 2694 //lambda only allowed in assignment or method invocation/cast context 2695 log.error(that.pos(), Errors.UnexpectedLambda); 2696 } 2697 resultInfo = recoveryInfo; 2698 } 2699 //create an environment for attribution of the lambda expression 2700 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2701 boolean needsRecovery = 2702 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2703 try { 2704 if (needsRecovery && isSerializable(pt())) { 2705 localEnv.info.isSerializable = true; 2706 localEnv.info.isLambda = true; 2707 } 2708 List<Type> explicitParamTypes = null; 2709 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2710 //attribute lambda parameters 2711 attribStats(that.params, localEnv); 2712 explicitParamTypes = TreeInfo.types(that.params); 2713 } 2714 2715 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2716 Type currentTarget = targetInfo.target; 2717 Type lambdaType = targetInfo.descriptor; 2718 2719 if (currentTarget.isErroneous()) { 2720 result = that.type = currentTarget; 2721 return; 2722 } 2723 2724 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2725 2726 if (lambdaType.hasTag(FORALL)) { 2727 //lambda expression target desc cannot be a generic method 2728 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType, 2729 kindName(currentTarget.tsym), 2730 currentTarget.tsym); 2731 resultInfo.checkContext.report(that, diags.fragment(msg)); 2732 result = that.type = types.createErrorType(pt()); 2733 return; 2734 } 2735 2736 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2737 //add param type info in the AST 2738 List<Type> actuals = lambdaType.getParameterTypes(); 2739 List<JCVariableDecl> params = that.params; 2740 2741 boolean arityMismatch = false; 2742 2743 while (params.nonEmpty()) { 2744 if (actuals.isEmpty()) { 2745 //not enough actuals to perform lambda parameter inference 2746 arityMismatch = true; 2747 } 2748 //reset previously set info 2749 Type argType = arityMismatch ? 2750 syms.errType : 2751 actuals.head; 2752 if (params.head.isImplicitlyTyped()) { 2753 setSyntheticVariableType(params.head, argType); 2754 } 2755 params.head.sym = null; 2756 actuals = actuals.isEmpty() ? 2757 actuals : 2758 actuals.tail; 2759 params = params.tail; 2760 } 2761 2762 //attribute lambda parameters 2763 attribStats(that.params, localEnv); 2764 2765 if (arityMismatch) { 2766 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda)); 2767 result = that.type = types.createErrorType(currentTarget); 2768 return; 2769 } 2770 } 2771 2772 //from this point on, no recovery is needed; if we are in assignment context 2773 //we will be able to attribute the whole lambda body, regardless of errors; 2774 //if we are in a 'check' method context, and the lambda is not compatible 2775 //with the target-type, it will be recovered anyway in Attr.checkId 2776 needsRecovery = false; 2777 2778 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2779 lambdaBodyResult(that, lambdaType, resultInfo); 2780 2781 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2782 attribTree(that.getBody(), localEnv, bodyResultInfo); 2783 } else { 2784 JCBlock body = (JCBlock)that.body; 2785 if (body == breakTree && 2786 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2787 breakTreeFound(copyEnv(localEnv)); 2788 } 2789 attribStats(body.stats, localEnv); 2790 } 2791 2792 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2793 2794 boolean isSpeculativeRound = 2795 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2796 2797 preFlow(that); 2798 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2799 2800 that.type = currentTarget; //avoids recovery at this stage 2801 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2802 2803 if (!isSpeculativeRound) { 2804 //add thrown types as bounds to the thrown types free variables if needed: 2805 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2806 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2807 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) { 2808 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes())); 2809 } 2810 } 2811 2812 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2813 } 2814 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2815 } catch (Types.FunctionDescriptorLookupError ex) { 2816 JCDiagnostic cause = ex.getDiagnostic(); 2817 resultInfo.checkContext.report(that, cause); 2818 result = that.type = types.createErrorType(pt()); 2819 return; 2820 } catch (Throwable t) { 2821 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2822 //as that would likely cause the same exception again. 2823 needsRecovery = false; 2824 throw t; 2825 } finally { 2826 localEnv.info.scope.leave(); 2827 if (needsRecovery) { 2828 attribTree(that, env, recoveryInfo); 2829 } 2830 } 2831 } 2832 //where 2833 class TargetInfo { 2834 Type target; 2835 Type descriptor; 2836 2837 public TargetInfo(Type target, Type descriptor) { 2838 this.target = target; 2839 this.descriptor = descriptor; 2840 } 2841 } 2842 2843 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2844 Type lambdaType; 2845 Type currentTarget = resultInfo.pt; 2846 if (resultInfo.pt != Type.recoveryType) { 2847 /* We need to adjust the target. If the target is an 2848 * intersection type, for example: SAM & I1 & I2 ... 2849 * the target will be updated to SAM 2850 */ 2851 currentTarget = targetChecker.visit(currentTarget, that); 2852 if (!currentTarget.isIntersection()) { 2853 if (explicitParamTypes != null) { 2854 currentTarget = infer.instantiateFunctionalInterface(that, 2855 currentTarget, explicitParamTypes, resultInfo.checkContext); 2856 } 2857 currentTarget = types.removeWildcards(currentTarget); 2858 lambdaType = types.findDescriptorType(currentTarget); 2859 } else { 2860 IntersectionClassType ict = (IntersectionClassType)currentTarget; 2861 ListBuffer<Type> components = new ListBuffer<>(); 2862 for (Type bound : ict.getExplicitComponents()) { 2863 if (explicitParamTypes != null) { 2864 try { 2865 bound = infer.instantiateFunctionalInterface(that, 2866 bound, explicitParamTypes, resultInfo.checkContext); 2867 } catch (FunctionDescriptorLookupError t) { 2868 // do nothing 2869 } 2870 } 2871 bound = types.removeWildcards(bound); 2872 components.add(bound); 2873 } 2874 currentTarget = types.makeIntersectionType(components.toList()); 2875 currentTarget.tsym.flags_field |= INTERFACE; 2876 lambdaType = types.findDescriptorType(currentTarget); 2877 } 2878 2879 } else { 2880 currentTarget = Type.recoveryType; 2881 lambdaType = fallbackDescriptorType(that); 2882 } 2883 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2884 //lambda expression target desc cannot be a generic method 2885 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType, 2886 kindName(currentTarget.tsym), 2887 currentTarget.tsym); 2888 resultInfo.checkContext.report(that, diags.fragment(msg)); 2889 currentTarget = types.createErrorType(pt()); 2890 } 2891 return new TargetInfo(currentTarget, lambdaType); 2892 } 2893 2894 void preFlow(JCLambda tree) { 2895 new PostAttrAnalyzer() { 2896 @Override 2897 public void scan(JCTree tree) { 2898 if (tree == null || 2899 (tree.type != null && 2900 tree.type == Type.stuckType)) { 2901 //don't touch stuck expressions! 2902 return; 2903 } 2904 super.scan(tree); 2905 } 2906 }.scan(tree); 2907 } 2908 2909 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2910 2911 @Override 2912 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2913 return t.isIntersection() ? 2914 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2915 } 2916 2917 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2918 types.findDescriptorSymbol(makeNotionalInterface(ict, pos)); 2919 return ict; 2920 } 2921 2922 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) { 2923 ListBuffer<Type> targs = new ListBuffer<>(); 2924 ListBuffer<Type> supertypes = new ListBuffer<>(); 2925 for (Type i : ict.interfaces_field) { 2926 if (i.isParameterized()) { 2927 targs.appendList(i.tsym.type.allparams()); 2928 } 2929 supertypes.append(i.tsym.type); 2930 } 2931 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2932 notionalIntf.allparams_field = targs.toList(); 2933 notionalIntf.tsym.flags_field |= INTERFACE; 2934 return notionalIntf.tsym; 2935 } 2936 }; 2937 2938 private Type fallbackDescriptorType(JCExpression tree) { 2939 switch (tree.getTag()) { 2940 case LAMBDA: 2941 JCLambda lambda = (JCLambda)tree; 2942 List<Type> argtypes = List.nil(); 2943 for (JCVariableDecl param : lambda.params) { 2944 argtypes = param.vartype != null && param.vartype.type != null ? 2945 argtypes.append(param.vartype.type) : 2946 argtypes.append(syms.errType); 2947 } 2948 return new MethodType(argtypes, Type.recoveryType, 2949 List.of(syms.throwableType), syms.methodClass); 2950 case REFERENCE: 2951 return new MethodType(List.nil(), Type.recoveryType, 2952 List.of(syms.throwableType), syms.methodClass); 2953 default: 2954 Assert.error("Cannot get here!"); 2955 } 2956 return null; 2957 } 2958 2959 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2960 final InferenceContext inferenceContext, final Type... ts) { 2961 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2962 } 2963 2964 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2965 final InferenceContext inferenceContext, final List<Type> ts) { 2966 if (inferenceContext.free(ts)) { 2967 inferenceContext.addFreeTypeListener(ts, 2968 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts))); 2969 } else { 2970 for (Type t : ts) { 2971 rs.checkAccessibleType(env, t); 2972 } 2973 } 2974 } 2975 2976 /** 2977 * Lambda/method reference have a special check context that ensures 2978 * that i.e. a lambda return type is compatible with the expected 2979 * type according to both the inherited context and the assignment 2980 * context. 2981 */ 2982 class FunctionalReturnContext extends Check.NestedCheckContext { 2983 2984 FunctionalReturnContext(CheckContext enclosingContext) { 2985 super(enclosingContext); 2986 } 2987 2988 @Override 2989 public boolean compatible(Type found, Type req, Warner warn) { 2990 //return type must be compatible in both current context and assignment context 2991 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 2992 } 2993 2994 @Override 2995 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2996 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details))); 2997 } 2998 } 2999 3000 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 3001 3002 JCExpression expr; 3003 boolean expStmtExpected; 3004 3005 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 3006 super(enclosingContext); 3007 this.expr = expr; 3008 } 3009 3010 @Override 3011 public void report(DiagnosticPosition pos, JCDiagnostic details) { 3012 if (expStmtExpected) { 3013 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 3014 } else { 3015 super.report(pos, details); 3016 } 3017 } 3018 3019 @Override 3020 public boolean compatible(Type found, Type req, Warner warn) { 3021 //a void return is compatible with an expression statement lambda 3022 if (req.hasTag(VOID)) { 3023 expStmtExpected = true; 3024 return TreeInfo.isExpressionStatement(expr); 3025 } else { 3026 return super.compatible(found, req, warn); 3027 } 3028 } 3029 } 3030 3031 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 3032 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 3033 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 3034 new FunctionalReturnContext(resultInfo.checkContext); 3035 3036 return descriptor.getReturnType() == Type.recoveryType ? 3037 recoveryInfo : 3038 new ResultInfo(KindSelector.VAL, 3039 descriptor.getReturnType(), funcContext); 3040 } 3041 3042 /** 3043 * Lambda compatibility. Check that given return types, thrown types, parameter types 3044 * are compatible with the expected functional interface descriptor. This means that: 3045 * (i) parameter types must be identical to those of the target descriptor; (ii) return 3046 * types must be compatible with the return type of the expected descriptor. 3047 */ 3048 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 3049 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 3050 3051 //return values have already been checked - but if lambda has no return 3052 //values, we must ensure that void/value compatibility is correct; 3053 //this amounts at checking that, if a lambda body can complete normally, 3054 //the descriptor's return type must be void 3055 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 3056 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 3057 Fragment msg = 3058 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType)); 3059 checkContext.report(tree, 3060 diags.fragment(msg)); 3061 } 3062 3063 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 3064 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 3065 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda)); 3066 } 3067 } 3068 3069 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 3070 * static field and that lambda has type annotations, these annotations will 3071 * also be stored at these fake clinit methods. 3072 * 3073 * LambdaToMethod also use fake clinit methods so they can be reused. 3074 * Also as LTM is a phase subsequent to attribution, the methods from 3075 * clinits can be safely removed by LTM to save memory. 3076 */ 3077 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 3078 3079 public MethodSymbol removeClinit(ClassSymbol sym) { 3080 return clinits.remove(sym); 3081 } 3082 3083 /* This method returns an environment to be used to attribute a lambda 3084 * expression. 3085 * 3086 * The owner of this environment is a method symbol. If the current owner 3087 * is not a method, for example if the lambda is used to initialize 3088 * a field, then if the field is: 3089 * 3090 * - an instance field, we use the first constructor. 3091 * - a static field, we create a fake clinit method. 3092 */ 3093 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 3094 Env<AttrContext> lambdaEnv; 3095 Symbol owner = env.info.scope.owner; 3096 if (owner.kind == VAR && owner.owner.kind == TYP) { 3097 //field initializer 3098 ClassSymbol enclClass = owner.enclClass(); 3099 Symbol newScopeOwner = env.info.scope.owner; 3100 /* if the field isn't static, then we can get the first constructor 3101 * and use it as the owner of the environment. This is what 3102 * LTM code is doing to look for type annotations so we are fine. 3103 */ 3104 if ((owner.flags() & STATIC) == 0) { 3105 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 3106 newScopeOwner = s; 3107 break; 3108 } 3109 } else { 3110 /* if the field is static then we need to create a fake clinit 3111 * method, this method can later be reused by LTM. 3112 */ 3113 MethodSymbol clinit = clinits.get(enclClass); 3114 if (clinit == null) { 3115 Type clinitType = new MethodType(List.nil(), 3116 syms.voidType, List.nil(), syms.methodClass); 3117 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 3118 names.clinit, clinitType, enclClass); 3119 clinit.params = List.nil(); 3120 clinits.put(enclClass, clinit); 3121 } 3122 newScopeOwner = clinit; 3123 } 3124 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 3125 } else { 3126 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 3127 } 3128 lambdaEnv.info.breakResult = null; 3129 return lambdaEnv; 3130 } 3131 3132 @Override 3133 public void visitReference(final JCMemberReference that) { 3134 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 3135 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 3136 //method reference only allowed in assignment or method invocation/cast context 3137 log.error(that.pos(), Errors.UnexpectedMref); 3138 } 3139 result = that.type = types.createErrorType(pt()); 3140 return; 3141 } 3142 final Env<AttrContext> localEnv = env.dup(that); 3143 try { 3144 //attribute member reference qualifier - if this is a constructor 3145 //reference, the expected kind must be a type 3146 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 3147 3148 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 3149 exprType = chk.checkConstructorRefType(that.expr, exprType); 3150 if (!exprType.isErroneous() && 3151 exprType.isRaw() && 3152 that.typeargs != null) { 3153 log.error(that.expr.pos(), 3154 Errors.InvalidMref(Kinds.kindName(that.getMode()), 3155 Fragments.MrefInferAndExplicitParams)); 3156 exprType = types.createErrorType(exprType); 3157 } 3158 } 3159 3160 if (exprType.isErroneous()) { 3161 //if the qualifier expression contains problems, 3162 //give up attribution of method reference 3163 result = that.type = exprType; 3164 return; 3165 } 3166 3167 if (TreeInfo.isStaticSelector(that.expr, names)) { 3168 //if the qualifier is a type, validate it; raw warning check is 3169 //omitted as we don't know at this stage as to whether this is a 3170 //raw selector (because of inference) 3171 chk.validate(that.expr, env, false); 3172 } else { 3173 Symbol lhsSym = TreeInfo.symbol(that.expr); 3174 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 3175 } 3176 //attrib type-arguments 3177 List<Type> typeargtypes = List.nil(); 3178 if (that.typeargs != null) { 3179 typeargtypes = attribTypes(that.typeargs, localEnv); 3180 } 3181 3182 boolean isTargetSerializable = 3183 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3184 isSerializable(pt()); 3185 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 3186 Type currentTarget = targetInfo.target; 3187 Type desc = targetInfo.descriptor; 3188 3189 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 3190 List<Type> argtypes = desc.getParameterTypes(); 3191 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 3192 3193 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 3194 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 3195 } 3196 3197 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 3198 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 3199 try { 3200 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 3201 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck, 3202 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 3203 } finally { 3204 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 3205 } 3206 3207 Symbol refSym = refResult.fst; 3208 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 3209 3210 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 3211 * JDK-8075541 3212 */ 3213 if (refSym.kind != MTH) { 3214 boolean targetError; 3215 switch (refSym.kind) { 3216 case ABSENT_MTH: 3217 case MISSING_ENCL: 3218 targetError = false; 3219 break; 3220 case WRONG_MTH: 3221 case WRONG_MTHS: 3222 case AMBIGUOUS: 3223 case HIDDEN: 3224 case STATICERR: 3225 targetError = true; 3226 break; 3227 default: 3228 Assert.error("unexpected result kind " + refSym.kind); 3229 targetError = false; 3230 } 3231 3232 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()) 3233 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 3234 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 3235 3236 JCDiagnostic diag = diags.create(log.currentSource(), that, 3237 targetError ? 3238 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) : 3239 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag)); 3240 3241 if (targetError && currentTarget == Type.recoveryType) { 3242 //a target error doesn't make sense during recovery stage 3243 //as we don't know what actual parameter types are 3244 result = that.type = currentTarget; 3245 return; 3246 } else { 3247 if (targetError) { 3248 resultInfo.checkContext.report(that, diag); 3249 } else { 3250 log.report(diag); 3251 } 3252 result = that.type = types.createErrorType(currentTarget); 3253 return; 3254 } 3255 } 3256 3257 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym; 3258 that.kind = lookupHelper.referenceKind(that.sym); 3259 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 3260 3261 if (desc.getReturnType() == Type.recoveryType) { 3262 // stop here 3263 result = that.type = currentTarget; 3264 return; 3265 } 3266 3267 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) { 3268 Type enclosingType = exprType.getEnclosingType(); 3269 if (enclosingType != null && enclosingType.hasTag(CLASS)) { 3270 // Check for the existence of an apropriate outer instance 3271 rs.resolveImplicitThis(that.pos(), env, exprType); 3272 } 3273 } 3274 3275 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 3276 3277 if (that.getMode() == ReferenceMode.INVOKE && 3278 TreeInfo.isStaticSelector(that.expr, names) && 3279 that.kind.isUnbound() && 3280 lookupHelper.site.isRaw()) { 3281 chk.checkRaw(that.expr, localEnv); 3282 } 3283 3284 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 3285 exprType.getTypeArguments().nonEmpty()) { 3286 //static ref with class type-args 3287 log.error(that.expr.pos(), 3288 Errors.InvalidMref(Kinds.kindName(that.getMode()), 3289 Fragments.StaticMrefWithTargs)); 3290 result = that.type = types.createErrorType(currentTarget); 3291 return; 3292 } 3293 3294 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 3295 // Check that super-qualified symbols are not abstract (JLS) 3296 rs.checkNonAbstract(that.pos(), that.sym); 3297 } 3298 3299 if (isTargetSerializable) { 3300 chk.checkAccessFromSerializableElement(that, true); 3301 } 3302 } 3303 3304 ResultInfo checkInfo = 3305 resultInfo.dup(newMethodTemplate( 3306 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 3307 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 3308 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 3309 3310 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 3311 3312 if (that.kind.isUnbound() && 3313 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 3314 //re-generate inference constraints for unbound receiver 3315 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 3316 //cannot happen as this has already been checked - we just need 3317 //to regenerate the inference constraints, as that has been lost 3318 //as a result of the call to inferenceContext.save() 3319 Assert.error("Can't get here"); 3320 } 3321 } 3322 3323 if (!refType.isErroneous()) { 3324 refType = types.createMethodTypeWithReturn(refType, 3325 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3326 } 3327 3328 //go ahead with standard method reference compatibility check - note that param check 3329 //is a no-op (as this has been taken care during method applicability) 3330 boolean isSpeculativeRound = 3331 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3332 3333 that.type = currentTarget; //avoids recovery at this stage 3334 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3335 if (!isSpeculativeRound) { 3336 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3337 } 3338 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3339 } catch (Types.FunctionDescriptorLookupError ex) { 3340 JCDiagnostic cause = ex.getDiagnostic(); 3341 resultInfo.checkContext.report(that, cause); 3342 result = that.type = types.createErrorType(pt()); 3343 return; 3344 } 3345 } 3346 //where 3347 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3348 //if this is a constructor reference, the expected kind must be a type 3349 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3350 KindSelector.VAL_TYP : KindSelector.TYP, 3351 Type.noType); 3352 } 3353 3354 3355 @SuppressWarnings("fallthrough") 3356 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3357 InferenceContext inferenceContext = checkContext.inferenceContext(); 3358 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3359 3360 Type resType; 3361 switch (tree.getMode()) { 3362 case NEW: 3363 if (!tree.expr.type.isRaw()) { 3364 resType = tree.expr.type; 3365 break; 3366 } 3367 default: 3368 resType = refType.getReturnType(); 3369 } 3370 3371 Type incompatibleReturnType = resType; 3372 3373 if (returnType.hasTag(VOID)) { 3374 incompatibleReturnType = null; 3375 } 3376 3377 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3378 if (resType.isErroneous() || 3379 new FunctionalReturnContext(checkContext).compatible(resType, returnType, 3380 checkContext.checkWarner(tree, resType, returnType))) { 3381 incompatibleReturnType = null; 3382 } 3383 } 3384 3385 if (incompatibleReturnType != null) { 3386 Fragment msg = 3387 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType())); 3388 checkContext.report(tree, diags.fragment(msg)); 3389 } else { 3390 if (inferenceContext.free(refType)) { 3391 // we need to wait for inference to finish and then replace inference vars in the referent type 3392 inferenceContext.addFreeTypeListener(List.of(refType), 3393 instantiatedContext -> { 3394 tree.referentType = instantiatedContext.asInstType(refType); 3395 }); 3396 } else { 3397 tree.referentType = refType; 3398 } 3399 } 3400 3401 if (!speculativeAttr) { 3402 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) { 3403 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes())); 3404 } 3405 } 3406 } 3407 3408 boolean checkExConstraints( 3409 List<Type> thrownByFuncExpr, 3410 List<Type> thrownAtFuncType, 3411 InferenceContext inferenceContext) { 3412 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that 3413 * are not proper types 3414 */ 3415 List<Type> nonProperList = thrownAtFuncType.stream() 3416 .filter(e -> inferenceContext.free(e)).collect(List.collector()); 3417 List<Type> properList = thrownAtFuncType.diff(nonProperList); 3418 3419 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or 3420 * in the throws clause of the invocation type of the method reference's compile-time 3421 * declaration 3422 */ 3423 List<Type> checkedList = thrownByFuncExpr.stream() 3424 .filter(e -> chk.isChecked(e)).collect(List.collector()); 3425 3426 /** If n = 0 (the function type's throws clause consists only of proper types), then 3427 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type 3428 * in the throws clause, the constraint reduces to false; otherwise, the constraint 3429 * reduces to true 3430 */ 3431 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>(); 3432 for (Type checked : checkedList) { 3433 boolean isSubtype = false; 3434 for (Type proper : properList) { 3435 if (types.isSubtype(checked, proper)) { 3436 isSubtype = true; 3437 break; 3438 } 3439 } 3440 if (!isSubtype) { 3441 uncaughtByProperTypes.add(checked); 3442 } 3443 } 3444 3445 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) { 3446 return false; 3447 } 3448 3449 /** If n > 0, the constraint reduces to a set of subtyping constraints: 3450 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the 3451 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej> 3452 */ 3453 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList); 3454 uncaughtByProperTypes.forEach(checkedEx -> { 3455 nonProperAsUndet.forEach(nonProper -> { 3456 types.isSubtype(checkedEx, nonProper); 3457 }); 3458 }); 3459 3460 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej 3461 */ 3462 nonProperAsUndet.stream() 3463 .filter(t -> t.hasTag(UNDETVAR)) 3464 .forEach(t -> ((UndetVar)t).setThrow()); 3465 return true; 3466 } 3467 3468 /** 3469 * Set functional type info on the underlying AST. Note: as the target descriptor 3470 * might contain inference variables, we might need to register an hook in the 3471 * current inference context. 3472 */ 3473 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3474 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3475 if (checkContext.inferenceContext().free(descriptorType)) { 3476 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), 3477 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3478 inferenceContext.asInstType(primaryTarget), checkContext)); 3479 } else { 3480 if (pt.hasTag(CLASS)) { 3481 fExpr.target = primaryTarget; 3482 } 3483 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3484 pt != Type.recoveryType) { 3485 //check that functional interface class is well-formed 3486 try { 3487 /* Types.makeFunctionalInterfaceClass() may throw an exception 3488 * when it's executed post-inference. See the listener code 3489 * above. 3490 */ 3491 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3492 names.empty, fExpr.target, ABSTRACT); 3493 if (csym != null) { 3494 chk.checkImplementations(env.tree, csym, csym); 3495 try { 3496 //perform an additional functional interface check on the synthetic class, 3497 //as there may be spurious errors for raw targets - because of existing issues 3498 //with membership and inheritance (see JDK-8074570). 3499 csym.flags_field |= INTERFACE; 3500 types.findDescriptorType(csym.type); 3501 } catch (FunctionDescriptorLookupError err) { 3502 resultInfo.checkContext.report(fExpr, 3503 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target))); 3504 } 3505 } 3506 } catch (Types.FunctionDescriptorLookupError ex) { 3507 JCDiagnostic cause = ex.getDiagnostic(); 3508 resultInfo.checkContext.report(env.tree, cause); 3509 } 3510 } 3511 } 3512 } 3513 3514 public void visitParens(JCParens tree) { 3515 Type owntype = attribTree(tree.expr, env, resultInfo); 3516 result = check(tree, owntype, pkind(), resultInfo); 3517 Symbol sym = TreeInfo.symbol(tree); 3518 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3519 log.error(tree.pos(), Errors.IllegalParenthesizedExpression); 3520 } 3521 3522 public void visitAssign(JCAssign tree) { 3523 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3524 Type capturedType = capture(owntype); 3525 attribExpr(tree.rhs, env, owntype); 3526 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3527 } 3528 3529 public void visitAssignop(JCAssignOp tree) { 3530 // Attribute arguments. 3531 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3532 Type operand = attribExpr(tree.rhs, env); 3533 // Find operator. 3534 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3535 if (operator != operators.noOpSymbol && 3536 !owntype.isErroneous() && 3537 !operand.isErroneous()) { 3538 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3539 chk.checkCastable(tree.rhs.pos(), 3540 operator.type.getReturnType(), 3541 owntype); 3542 } 3543 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3544 } 3545 3546 public void visitUnary(JCUnary tree) { 3547 // Attribute arguments. 3548 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3549 ? attribTree(tree.arg, env, varAssignmentInfo) 3550 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3551 3552 // Find operator. 3553 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3554 Type owntype = types.createErrorType(tree.type); 3555 if (operator != operators.noOpSymbol && 3556 !argtype.isErroneous()) { 3557 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3558 ? tree.arg.type 3559 : operator.type.getReturnType(); 3560 int opc = ((OperatorSymbol)operator).opcode; 3561 3562 // If the argument is constant, fold it. 3563 if (argtype.constValue() != null) { 3564 Type ctype = cfolder.fold1(opc, argtype); 3565 if (ctype != null) { 3566 owntype = cfolder.coerce(ctype, owntype); 3567 } 3568 } 3569 } 3570 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3571 } 3572 3573 public void visitBinary(JCBinary tree) { 3574 // Attribute arguments. 3575 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3576 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3577 // Find operator. 3578 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3579 Type owntype = types.createErrorType(tree.type); 3580 if (operator != operators.noOpSymbol && 3581 !left.isErroneous() && 3582 !right.isErroneous()) { 3583 owntype = operator.type.getReturnType(); 3584 int opc = ((OperatorSymbol)operator).opcode; 3585 // If both arguments are constants, fold them. 3586 if (left.constValue() != null && right.constValue() != null) { 3587 Type ctype = cfolder.fold2(opc, left, right); 3588 if (ctype != null) { 3589 owntype = cfolder.coerce(ctype, owntype); 3590 } 3591 } 3592 3593 // Check that argument types of a reference ==, != are 3594 // castable to each other, (JLS 15.21). Note: unboxing 3595 // comparisons will not have an acmp* opc at this point. 3596 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3597 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3598 log.error(tree.pos(), Errors.IncomparableTypes(left, right)); 3599 } 3600 } 3601 3602 chk.checkDivZero(tree.rhs.pos(), operator, right); 3603 } 3604 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3605 } 3606 3607 public void visitTypeCast(final JCTypeCast tree) { 3608 Type clazztype = attribType(tree.clazz, env); 3609 chk.validate(tree.clazz, env, false); 3610 //a fresh environment is required for 292 inference to work properly --- 3611 //see Infer.instantiatePolymorphicSignatureInstance() 3612 Env<AttrContext> localEnv = env.dup(tree); 3613 //should we propagate the target type? 3614 final ResultInfo castInfo; 3615 JCExpression expr = TreeInfo.skipParens(tree.expr); 3616 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3617 if (isPoly) { 3618 //expression is a poly - we need to propagate target type info 3619 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3620 new Check.NestedCheckContext(resultInfo.checkContext) { 3621 @Override 3622 public boolean compatible(Type found, Type req, Warner warn) { 3623 return types.isCastable(found, req, warn); 3624 } 3625 }); 3626 } else { 3627 //standalone cast - target-type info is not propagated 3628 castInfo = unknownExprInfo; 3629 } 3630 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3631 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3632 if (exprtype.constValue() != null) 3633 owntype = cfolder.coerce(exprtype, owntype); 3634 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3635 if (!isPoly) 3636 chk.checkRedundantCast(localEnv, tree); 3637 } 3638 3639 public void visitTypeTest(JCInstanceOf tree) { 3640 Type exprtype = chk.checkNullOrRefType( 3641 tree.expr.pos(), attribExpr(tree.expr, env)); 3642 Type clazztype = attribType(tree.clazz, env); 3643 if (!clazztype.hasTag(TYPEVAR)) { 3644 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3645 } 3646 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3647 log.error(tree.clazz.pos(), Errors.IllegalGenericTypeForInstof); 3648 clazztype = types.createErrorType(clazztype); 3649 } 3650 chk.validate(tree.clazz, env, false); 3651 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3652 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3653 } 3654 3655 public void visitIndexed(JCArrayAccess tree) { 3656 Type owntype = types.createErrorType(tree.type); 3657 Type atype = attribExpr(tree.indexed, env); 3658 attribExpr(tree.index, env, syms.intType); 3659 if (types.isArray(atype)) 3660 owntype = types.elemtype(atype); 3661 else if (!atype.hasTag(ERROR)) 3662 log.error(tree.pos(), Errors.ArrayReqButFound(atype)); 3663 if (!pkind().contains(KindSelector.VAL)) 3664 owntype = capture(owntype); 3665 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3666 } 3667 3668 public void visitIdent(JCIdent tree) { 3669 Symbol sym; 3670 3671 // Find symbol 3672 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3673 // If we are looking for a method, the prototype `pt' will be a 3674 // method type with the type of the call's arguments as parameters. 3675 env.info.pendingResolutionPhase = null; 3676 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3677 } else if (tree.sym != null && tree.sym.kind != VAR) { 3678 sym = tree.sym; 3679 } else { 3680 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3681 } 3682 tree.sym = sym; 3683 3684 // (1) Also find the environment current for the class where 3685 // sym is defined (`symEnv'). 3686 // Only for pre-tiger versions (1.4 and earlier): 3687 // (2) Also determine whether we access symbol out of an anonymous 3688 // class in a this or super call. This is illegal for instance 3689 // members since such classes don't carry a this$n link. 3690 // (`noOuterThisPath'). 3691 Env<AttrContext> symEnv = env; 3692 boolean noOuterThisPath = false; 3693 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3694 sym.kind.matches(KindSelector.VAL_MTH) && 3695 sym.owner.kind == TYP && 3696 tree.name != names._this && tree.name != names._super) { 3697 3698 // Find environment in which identifier is defined. 3699 while (symEnv.outer != null && 3700 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3701 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3702 noOuterThisPath = false; 3703 symEnv = symEnv.outer; 3704 } 3705 } 3706 3707 // If symbol is a variable, ... 3708 if (sym.kind == VAR) { 3709 VarSymbol v = (VarSymbol)sym; 3710 3711 // ..., evaluate its initializer, if it has one, and check for 3712 // illegal forward reference. 3713 checkInit(tree, env, v, false); 3714 3715 // If we are expecting a variable (as opposed to a value), check 3716 // that the variable is assignable in the current environment. 3717 if (KindSelector.ASG.subset(pkind())) 3718 checkAssignable(tree.pos(), v, null, env); 3719 } 3720 3721 // In a constructor body, 3722 // if symbol is a field or instance method, check that it is 3723 // not accessed before the supertype constructor is called. 3724 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3725 sym.kind.matches(KindSelector.VAL_MTH) && 3726 sym.owner.kind == TYP && 3727 (sym.flags() & STATIC) == 0) { 3728 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3729 sym : thisSym(tree.pos(), env)); 3730 } 3731 Env<AttrContext> env1 = env; 3732 if (sym.kind != ERR && sym.kind != TYP && 3733 sym.owner != null && sym.owner != env1.enclClass.sym) { 3734 // If the found symbol is inaccessible, then it is 3735 // accessed through an enclosing instance. Locate this 3736 // enclosing instance: 3737 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3738 env1 = env1.outer; 3739 } 3740 3741 if (env.info.isSerializable) { 3742 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3743 } 3744 3745 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3746 } 3747 3748 public void visitSelect(JCFieldAccess tree) { 3749 // Determine the expected kind of the qualifier expression. 3750 KindSelector skind = KindSelector.NIL; 3751 if (tree.name == names._this || tree.name == names._super || 3752 tree.name == names._class) 3753 { 3754 skind = KindSelector.TYP; 3755 } else { 3756 if (pkind().contains(KindSelector.PCK)) 3757 skind = KindSelector.of(skind, KindSelector.PCK); 3758 if (pkind().contains(KindSelector.TYP)) 3759 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3760 if (pkind().contains(KindSelector.VAL_MTH)) 3761 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3762 } 3763 3764 // Attribute the qualifier expression, and determine its symbol (if any). 3765 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3766 if (!pkind().contains(KindSelector.TYP_PCK)) 3767 site = capture(site); // Capture field access 3768 3769 // don't allow T.class T[].class, etc 3770 if (skind == KindSelector.TYP) { 3771 Type elt = site; 3772 while (elt.hasTag(ARRAY)) 3773 elt = ((ArrayType)elt).elemtype; 3774 if (elt.hasTag(TYPEVAR)) { 3775 log.error(tree.pos(), Errors.TypeVarCantBeDeref); 3776 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3777 tree.sym = tree.type.tsym; 3778 return ; 3779 } 3780 } 3781 3782 // If qualifier symbol is a type or `super', assert `selectSuper' 3783 // for the selection. This is relevant for determining whether 3784 // protected symbols are accessible. 3785 Symbol sitesym = TreeInfo.symbol(tree.selected); 3786 boolean selectSuperPrev = env.info.selectSuper; 3787 env.info.selectSuper = 3788 sitesym != null && 3789 sitesym.name == names._super; 3790 3791 // Determine the symbol represented by the selection. 3792 env.info.pendingResolutionPhase = null; 3793 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3794 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3795 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym)); 3796 sym = syms.errSymbol; 3797 } 3798 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3799 site = capture(site); 3800 sym = selectSym(tree, sitesym, site, env, resultInfo); 3801 } 3802 boolean varArgs = env.info.lastResolveVarargs(); 3803 tree.sym = sym; 3804 3805 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3806 site = types.skipTypeVars(site, true); 3807 } 3808 3809 // If that symbol is a variable, ... 3810 if (sym.kind == VAR) { 3811 VarSymbol v = (VarSymbol)sym; 3812 3813 // ..., evaluate its initializer, if it has one, and check for 3814 // illegal forward reference. 3815 checkInit(tree, env, v, true); 3816 3817 // If we are expecting a variable (as opposed to a value), check 3818 // that the variable is assignable in the current environment. 3819 if (KindSelector.ASG.subset(pkind())) 3820 checkAssignable(tree.pos(), v, tree.selected, env); 3821 } 3822 3823 if (sitesym != null && 3824 sitesym.kind == VAR && 3825 ((VarSymbol)sitesym).isResourceVariable() && 3826 sym.kind == MTH && 3827 sym.name.equals(names.close) && 3828 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3829 env.info.lint.isEnabled(LintCategory.TRY)) { 3830 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall); 3831 } 3832 3833 // Disallow selecting a type from an expression 3834 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3835 tree.type = check(tree.selected, pt(), 3836 sitesym == null ? 3837 KindSelector.VAL : sitesym.kind.toSelector(), 3838 new ResultInfo(KindSelector.TYP_PCK, pt())); 3839 } 3840 3841 if (isType(sitesym)) { 3842 if (sym.name == names._this) { 3843 // If `C' is the currently compiled class, check that 3844 // C.this' does not appear in a call to a super(...) 3845 if (env.info.isSelfCall && 3846 site.tsym == env.enclClass.sym) { 3847 chk.earlyRefError(tree.pos(), sym); 3848 } 3849 } else { 3850 // Check if type-qualified fields or methods are static (JLS) 3851 if ((sym.flags() & STATIC) == 0 && 3852 sym.name != names._super && 3853 (sym.kind == VAR || sym.kind == MTH)) { 3854 rs.accessBase(rs.new StaticError(sym), 3855 tree.pos(), site, sym.name, true); 3856 } 3857 } 3858 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3859 sym.isStatic() && sym.kind == MTH) { 3860 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName)); 3861 } 3862 } else if (sym.kind != ERR && 3863 (sym.flags() & STATIC) != 0 && 3864 sym.name != names._class) { 3865 // If the qualified item is not a type and the selected item is static, report 3866 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3867 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner)); 3868 } 3869 3870 // If we are selecting an instance member via a `super', ... 3871 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3872 3873 // Check that super-qualified symbols are not abstract (JLS) 3874 rs.checkNonAbstract(tree.pos(), sym); 3875 3876 if (site.isRaw()) { 3877 // Determine argument types for site. 3878 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3879 if (site1 != null) site = site1; 3880 } 3881 } 3882 3883 if (env.info.isSerializable) { 3884 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3885 } 3886 3887 env.info.selectSuper = selectSuperPrev; 3888 result = checkId(tree, site, sym, env, resultInfo); 3889 } 3890 //where 3891 /** Determine symbol referenced by a Select expression, 3892 * 3893 * @param tree The select tree. 3894 * @param site The type of the selected expression, 3895 * @param env The current environment. 3896 * @param resultInfo The current result. 3897 */ 3898 private Symbol selectSym(JCFieldAccess tree, 3899 Symbol location, 3900 Type site, 3901 Env<AttrContext> env, 3902 ResultInfo resultInfo) { 3903 DiagnosticPosition pos = tree.pos(); 3904 Name name = tree.name; 3905 switch (site.getTag()) { 3906 case PACKAGE: 3907 return rs.accessBase( 3908 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3909 pos, location, site, name, true); 3910 case ARRAY: 3911 case CLASS: 3912 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3913 return rs.resolveQualifiedMethod( 3914 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3915 } else if (name == names._this || name == names._super) { 3916 return rs.resolveSelf(pos, env, site.tsym, name); 3917 } else if (name == names._class) { 3918 // In this case, we have already made sure in 3919 // visitSelect that qualifier expression is a type. 3920 return syms.getClassField(site, types); 3921 } else { 3922 // We are seeing a plain identifier as selector. 3923 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3924 sym = rs.accessBase(sym, pos, location, site, name, true); 3925 return sym; 3926 } 3927 case WILDCARD: 3928 throw new AssertionError(tree); 3929 case TYPEVAR: 3930 // Normally, site.getUpperBound() shouldn't be null. 3931 // It should only happen during memberEnter/attribBase 3932 // when determining the super type which *must* beac 3933 // done before attributing the type variables. In 3934 // other words, we are seeing this illegal program: 3935 // class B<T> extends A<T.foo> {} 3936 Symbol sym = (site.getUpperBound() != null) 3937 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3938 : null; 3939 if (sym == null) { 3940 log.error(pos, Errors.TypeVarCantBeDeref); 3941 return syms.errSymbol; 3942 } else { 3943 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3944 rs.new AccessError(env, site, sym) : 3945 sym; 3946 rs.accessBase(sym2, pos, location, site, name, true); 3947 return sym; 3948 } 3949 case ERROR: 3950 // preserve identifier names through errors 3951 return types.createErrorType(name, site.tsym, site).tsym; 3952 default: 3953 // The qualifier expression is of a primitive type -- only 3954 // .class is allowed for these. 3955 if (name == names._class) { 3956 // In this case, we have already made sure in Select that 3957 // qualifier expression is a type. 3958 return syms.getClassField(site, types); 3959 } else { 3960 log.error(pos, Errors.CantDeref(site)); 3961 return syms.errSymbol; 3962 } 3963 } 3964 } 3965 3966 /** Determine type of identifier or select expression and check that 3967 * (1) the referenced symbol is not deprecated 3968 * (2) the symbol's type is safe (@see checkSafe) 3969 * (3) if symbol is a variable, check that its type and kind are 3970 * compatible with the prototype and protokind. 3971 * (4) if symbol is an instance field of a raw type, 3972 * which is being assigned to, issue an unchecked warning if its 3973 * type changes under erasure. 3974 * (5) if symbol is an instance method of a raw type, issue an 3975 * unchecked warning if its argument types change under erasure. 3976 * If checks succeed: 3977 * If symbol is a constant, return its constant type 3978 * else if symbol is a method, return its result type 3979 * otherwise return its type. 3980 * Otherwise return errType. 3981 * 3982 * @param tree The syntax tree representing the identifier 3983 * @param site If this is a select, the type of the selected 3984 * expression, otherwise the type of the current class. 3985 * @param sym The symbol representing the identifier. 3986 * @param env The current environment. 3987 * @param resultInfo The expected result 3988 */ 3989 Type checkId(JCTree tree, 3990 Type site, 3991 Symbol sym, 3992 Env<AttrContext> env, 3993 ResultInfo resultInfo) { 3994 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3995 checkMethodIdInternal(tree, site, sym, env, resultInfo) : 3996 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3997 } 3998 3999 Type checkMethodIdInternal(JCTree tree, 4000 Type site, 4001 Symbol sym, 4002 Env<AttrContext> env, 4003 ResultInfo resultInfo) { 4004 if (resultInfo.pkind.contains(KindSelector.POLY)) { 4005 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 4006 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 4007 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4008 return owntype; 4009 } else { 4010 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 4011 } 4012 } 4013 4014 Type checkIdInternal(JCTree tree, 4015 Type site, 4016 Symbol sym, 4017 Type pt, 4018 Env<AttrContext> env, 4019 ResultInfo resultInfo) { 4020 if (pt.isErroneous()) { 4021 return types.createErrorType(site); 4022 } 4023 Type owntype; // The computed type of this identifier occurrence. 4024 switch (sym.kind) { 4025 case TYP: 4026 // For types, the computed type equals the symbol's type, 4027 // except for two situations: 4028 owntype = sym.type; 4029 if (owntype.hasTag(CLASS)) { 4030 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 4031 Type ownOuter = owntype.getEnclosingType(); 4032 4033 // (a) If the symbol's type is parameterized, erase it 4034 // because no type parameters were given. 4035 // We recover generic outer type later in visitTypeApply. 4036 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 4037 owntype = types.erasure(owntype); 4038 } 4039 4040 // (b) If the symbol's type is an inner class, then 4041 // we have to interpret its outer type as a superclass 4042 // of the site type. Example: 4043 // 4044 // class Tree<A> { class Visitor { ... } } 4045 // class PointTree extends Tree<Point> { ... } 4046 // ...PointTree.Visitor... 4047 // 4048 // Then the type of the last expression above is 4049 // Tree<Point>.Visitor. 4050 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 4051 Type normOuter = site; 4052 if (normOuter.hasTag(CLASS)) { 4053 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 4054 } 4055 if (normOuter == null) // perhaps from an import 4056 normOuter = types.erasure(ownOuter); 4057 if (normOuter != ownOuter) 4058 owntype = new ClassType( 4059 normOuter, List.nil(), owntype.tsym, 4060 owntype.getMetadata()); 4061 } 4062 } 4063 break; 4064 case VAR: 4065 VarSymbol v = (VarSymbol)sym; 4066 4067 if (env.info.enclVar != null 4068 && v.type.hasTag(NONE)) { 4069 //self reference to implicitly typed variable declaration 4070 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef)); 4071 return v.type = types.createErrorType(v.type); 4072 } 4073 4074 // Test (4): if symbol is an instance field of a raw type, 4075 // which is being assigned to, issue an unchecked warning if 4076 // its type changes under erasure. 4077 if (KindSelector.ASG.subset(pkind()) && 4078 v.owner.kind == TYP && 4079 (v.flags() & STATIC) == 0 && 4080 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 4081 Type s = types.asOuterSuper(site, v.owner); 4082 if (s != null && 4083 s.isRaw() && 4084 !types.isSameType(v.type, v.erasure(types))) { 4085 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s)); 4086 } 4087 } 4088 // The computed type of a variable is the type of the 4089 // variable symbol, taken as a member of the site type. 4090 owntype = (sym.owner.kind == TYP && 4091 sym.name != names._this && sym.name != names._super) 4092 ? types.memberType(site, sym) 4093 : sym.type; 4094 4095 // If the variable is a constant, record constant value in 4096 // computed type. 4097 if (v.getConstValue() != null && isStaticReference(tree)) 4098 owntype = owntype.constType(v.getConstValue()); 4099 4100 if (resultInfo.pkind == KindSelector.VAL) { 4101 owntype = capture(owntype); // capture "names as expressions" 4102 } 4103 break; 4104 case MTH: { 4105 owntype = checkMethod(site, sym, 4106 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode), 4107 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 4108 resultInfo.pt.getTypeArguments()); 4109 break; 4110 } 4111 case PCK: case ERR: 4112 owntype = sym.type; 4113 break; 4114 default: 4115 throw new AssertionError("unexpected kind: " + sym.kind + 4116 " in tree " + tree); 4117 } 4118 4119 // Emit a `deprecation' warning if symbol is deprecated. 4120 // (for constructors (but not for constructor references), the error 4121 // was given when the constructor was resolved) 4122 4123 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 4124 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 4125 chk.checkSunAPI(tree.pos(), sym); 4126 chk.checkProfile(tree.pos(), sym); 4127 } 4128 4129 // If symbol is a variable, check that its type and 4130 // kind are compatible with the prototype and protokind. 4131 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 4132 } 4133 4134 /** Check that variable is initialized and evaluate the variable's 4135 * initializer, if not yet done. Also check that variable is not 4136 * referenced before it is defined. 4137 * @param tree The tree making up the variable reference. 4138 * @param env The current environment. 4139 * @param v The variable's symbol. 4140 */ 4141 private void checkInit(JCTree tree, 4142 Env<AttrContext> env, 4143 VarSymbol v, 4144 boolean onlyWarning) { 4145 // A forward reference is diagnosed if the declaration position 4146 // of the variable is greater than the current tree position 4147 // and the tree and variable definition occur in the same class 4148 // definition. Note that writes don't count as references. 4149 // This check applies only to class and instance 4150 // variables. Local variables follow different scope rules, 4151 // and are subject to definite assignment checking. 4152 Env<AttrContext> initEnv = enclosingInitEnv(env); 4153 if (initEnv != null && 4154 (initEnv.info.enclVar == v || v.pos > tree.pos) && 4155 v.owner.kind == TYP && 4156 v.owner == env.info.scope.owner.enclClass() && 4157 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 4158 (!env.tree.hasTag(ASSIGN) || 4159 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 4160 if (!onlyWarning || isStaticEnumField(v)) { 4161 Error errkey = (initEnv.info.enclVar == v) ? 4162 Errors.IllegalSelfRef : Errors.IllegalForwardRef; 4163 log.error(tree.pos(), errkey); 4164 } else if (useBeforeDeclarationWarning) { 4165 Warning warnkey = (initEnv.info.enclVar == v) ? 4166 Warnings.SelfRef(v) : Warnings.ForwardRef(v); 4167 log.warning(tree.pos(), warnkey); 4168 } 4169 } 4170 4171 v.getConstValue(); // ensure initializer is evaluated 4172 4173 checkEnumInitializer(tree, env, v); 4174 } 4175 4176 /** 4177 * Returns the enclosing init environment associated with this env (if any). An init env 4178 * can be either a field declaration env or a static/instance initializer env. 4179 */ 4180 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 4181 while (true) { 4182 switch (env.tree.getTag()) { 4183 case VARDEF: 4184 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 4185 if (vdecl.sym.owner.kind == TYP) { 4186 //field 4187 return env; 4188 } 4189 break; 4190 case BLOCK: 4191 if (env.next.tree.hasTag(CLASSDEF)) { 4192 //instance/static initializer 4193 return env; 4194 } 4195 break; 4196 case METHODDEF: 4197 case CLASSDEF: 4198 case TOPLEVEL: 4199 return null; 4200 } 4201 Assert.checkNonNull(env.next); 4202 env = env.next; 4203 } 4204 } 4205 4206 /** 4207 * Check for illegal references to static members of enum. In 4208 * an enum type, constructors and initializers may not 4209 * reference its static members unless they are constant. 4210 * 4211 * @param tree The tree making up the variable reference. 4212 * @param env The current environment. 4213 * @param v The variable's symbol. 4214 * @jls section 8.9 Enums 4215 */ 4216 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 4217 // JLS: 4218 // 4219 // "It is a compile-time error to reference a static field 4220 // of an enum type that is not a compile-time constant 4221 // (15.28) from constructors, instance initializer blocks, 4222 // or instance variable initializer expressions of that 4223 // type. It is a compile-time error for the constructors, 4224 // instance initializer blocks, or instance variable 4225 // initializer expressions of an enum constant e to refer 4226 // to itself or to an enum constant of the same type that 4227 // is declared to the right of e." 4228 if (isStaticEnumField(v)) { 4229 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 4230 4231 if (enclClass == null || enclClass.owner == null) 4232 return; 4233 4234 // See if the enclosing class is the enum (or a 4235 // subclass thereof) declaring v. If not, this 4236 // reference is OK. 4237 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 4238 return; 4239 4240 // If the reference isn't from an initializer, then 4241 // the reference is OK. 4242 if (!Resolve.isInitializer(env)) 4243 return; 4244 4245 log.error(tree.pos(), Errors.IllegalEnumStaticRef); 4246 } 4247 } 4248 4249 /** Is the given symbol a static, non-constant field of an Enum? 4250 * Note: enum literals should not be regarded as such 4251 */ 4252 private boolean isStaticEnumField(VarSymbol v) { 4253 return Flags.isEnum(v.owner) && 4254 Flags.isStatic(v) && 4255 !Flags.isConstant(v) && 4256 v.name != names._class; 4257 } 4258 4259 /** 4260 * Check that method arguments conform to its instantiation. 4261 **/ 4262 public Type checkMethod(Type site, 4263 final Symbol sym, 4264 ResultInfo resultInfo, 4265 Env<AttrContext> env, 4266 final List<JCExpression> argtrees, 4267 List<Type> argtypes, 4268 List<Type> typeargtypes) { 4269 // Test (5): if symbol is an instance method of a raw type, issue 4270 // an unchecked warning if its argument types change under erasure. 4271 if ((sym.flags() & STATIC) == 0 && 4272 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 4273 Type s = types.asOuterSuper(site, sym.owner); 4274 if (s != null && s.isRaw() && 4275 !types.isSameTypes(sym.type.getParameterTypes(), 4276 sym.erasure(types).getParameterTypes())) { 4277 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s)); 4278 } 4279 } 4280 4281 if (env.info.defaultSuperCallSite != null) { 4282 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 4283 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 4284 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 4285 List<MethodSymbol> icand_sup = 4286 types.interfaceCandidates(sup, (MethodSymbol)sym); 4287 if (icand_sup.nonEmpty() && 4288 icand_sup.head != sym && 4289 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 4290 log.error(env.tree.pos(), 4291 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup))); 4292 break; 4293 } 4294 } 4295 env.info.defaultSuperCallSite = null; 4296 } 4297 4298 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 4299 JCMethodInvocation app = (JCMethodInvocation)env.tree; 4300 if (app.meth.hasTag(SELECT) && 4301 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 4302 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site)); 4303 } 4304 } 4305 4306 // Compute the identifier's instantiated type. 4307 // For methods, we need to compute the instance type by 4308 // Resolve.instantiate from the symbol's type as well as 4309 // any type arguments and value arguments. 4310 Warner noteWarner = new Warner(); 4311 try { 4312 Type owntype = rs.checkMethod( 4313 env, 4314 site, 4315 sym, 4316 resultInfo, 4317 argtypes, 4318 typeargtypes, 4319 noteWarner); 4320 4321 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap = 4322 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 4323 4324 argtypes = argtypes.map(checkDeferredMap); 4325 4326 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 4327 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym), 4328 sym.name, 4329 rs.methodArguments(sym.type.getParameterTypes()), 4330 rs.methodArguments(argtypes.map(checkDeferredMap)), 4331 kindName(sym.location()), 4332 sym.location())); 4333 if (resultInfo.pt != Infer.anyPoly || 4334 !owntype.hasTag(METHOD) || 4335 !owntype.isPartial()) { 4336 //if this is not a partially inferred method type, erase return type. Otherwise, 4337 //erasure is carried out in PartiallyInferredMethodType.check(). 4338 owntype = new MethodType(owntype.getParameterTypes(), 4339 types.erasure(owntype.getReturnType()), 4340 types.erasure(owntype.getThrownTypes()), 4341 syms.methodClass); 4342 } 4343 } 4344 4345 PolyKind pkind = (sym.type.hasTag(FORALL) && 4346 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 4347 PolyKind.POLY : PolyKind.STANDALONE; 4348 TreeInfo.setPolyKind(env.tree, pkind); 4349 4350 return (resultInfo.pt == Infer.anyPoly) ? 4351 owntype : 4352 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4353 resultInfo.checkContext.inferenceContext()); 4354 } catch (Infer.InferenceException ex) { 4355 //invalid target type - propagate exception outwards or report error 4356 //depending on the current check context 4357 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 4358 return types.createErrorType(site); 4359 } catch (Resolve.InapplicableMethodException ex) { 4360 final JCDiagnostic diag = ex.getDiagnostic(); 4361 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 4362 @Override 4363 protected Pair<Symbol, JCDiagnostic> errCandidate() { 4364 return new Pair<>(sym, diag); 4365 } 4366 }; 4367 List<Type> argtypes2 = argtypes.map( 4368 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4369 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 4370 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 4371 log.report(errDiag); 4372 return types.createErrorType(site); 4373 } 4374 } 4375 4376 public void visitLiteral(JCLiteral tree) { 4377 result = check(tree, litType(tree.typetag).constType(tree.value), 4378 KindSelector.VAL, resultInfo); 4379 } 4380 //where 4381 /** Return the type of a literal with given type tag. 4382 */ 4383 Type litType(TypeTag tag) { 4384 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4385 } 4386 4387 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4388 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4389 } 4390 4391 public void visitTypeArray(JCArrayTypeTree tree) { 4392 Type etype = attribType(tree.elemtype, env); 4393 Type type = new ArrayType(etype, syms.arrayClass); 4394 result = check(tree, type, KindSelector.TYP, resultInfo); 4395 } 4396 4397 /** Visitor method for parameterized types. 4398 * Bound checking is left until later, since types are attributed 4399 * before supertype structure is completely known 4400 */ 4401 public void visitTypeApply(JCTypeApply tree) { 4402 Type owntype = types.createErrorType(tree.type); 4403 4404 // Attribute functor part of application and make sure it's a class. 4405 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4406 4407 // Attribute type parameters 4408 List<Type> actuals = attribTypes(tree.arguments, env); 4409 4410 if (clazztype.hasTag(CLASS)) { 4411 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4412 if (actuals.isEmpty()) //diamond 4413 actuals = formals; 4414 4415 if (actuals.length() == formals.length()) { 4416 List<Type> a = actuals; 4417 List<Type> f = formals; 4418 while (a.nonEmpty()) { 4419 a.head = a.head.withTypeVar(f.head); 4420 a = a.tail; 4421 f = f.tail; 4422 } 4423 // Compute the proper generic outer 4424 Type clazzOuter = clazztype.getEnclosingType(); 4425 if (clazzOuter.hasTag(CLASS)) { 4426 Type site; 4427 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4428 if (clazz.hasTag(IDENT)) { 4429 site = env.enclClass.sym.type; 4430 } else if (clazz.hasTag(SELECT)) { 4431 site = ((JCFieldAccess) clazz).selected.type; 4432 } else throw new AssertionError(""+tree); 4433 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4434 if (site.hasTag(CLASS)) 4435 site = types.asOuterSuper(site, clazzOuter.tsym); 4436 if (site == null) 4437 site = types.erasure(clazzOuter); 4438 clazzOuter = site; 4439 } 4440 } 4441 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4442 clazztype.getMetadata()); 4443 } else { 4444 if (formals.length() != 0) { 4445 log.error(tree.pos(), 4446 Errors.WrongNumberTypeArgs(Integer.toString(formals.length()))); 4447 } else { 4448 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym)); 4449 } 4450 owntype = types.createErrorType(tree.type); 4451 } 4452 } 4453 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4454 } 4455 4456 public void visitTypeUnion(JCTypeUnion tree) { 4457 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4458 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4459 for (JCExpression typeTree : tree.alternatives) { 4460 Type ctype = attribType(typeTree, env); 4461 ctype = chk.checkType(typeTree.pos(), 4462 chk.checkClassType(typeTree.pos(), ctype), 4463 syms.throwableType); 4464 if (!ctype.isErroneous()) { 4465 //check that alternatives of a union type are pairwise 4466 //unrelated w.r.t. subtyping 4467 if (chk.intersects(ctype, multicatchTypes.toList())) { 4468 for (Type t : multicatchTypes) { 4469 boolean sub = types.isSubtype(ctype, t); 4470 boolean sup = types.isSubtype(t, ctype); 4471 if (sub || sup) { 4472 //assume 'a' <: 'b' 4473 Type a = sub ? ctype : t; 4474 Type b = sub ? t : ctype; 4475 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b)); 4476 } 4477 } 4478 } 4479 multicatchTypes.append(ctype); 4480 if (all_multicatchTypes != null) 4481 all_multicatchTypes.append(ctype); 4482 } else { 4483 if (all_multicatchTypes == null) { 4484 all_multicatchTypes = new ListBuffer<>(); 4485 all_multicatchTypes.appendList(multicatchTypes); 4486 } 4487 all_multicatchTypes.append(ctype); 4488 } 4489 } 4490 Type t = check(tree, types.lub(multicatchTypes.toList()), 4491 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4492 if (t.hasTag(CLASS)) { 4493 List<Type> alternatives = 4494 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4495 t = new UnionClassType((ClassType) t, alternatives); 4496 } 4497 tree.type = result = t; 4498 } 4499 4500 public void visitTypeIntersection(JCTypeIntersection tree) { 4501 attribTypes(tree.bounds, env); 4502 tree.type = result = checkIntersection(tree, tree.bounds); 4503 } 4504 4505 public void visitTypeParameter(JCTypeParameter tree) { 4506 TypeVar typeVar = (TypeVar) tree.type; 4507 4508 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4509 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4510 } 4511 4512 if (!typeVar.bound.isErroneous()) { 4513 //fixup type-parameter bound computed in 'attribTypeVariables' 4514 typeVar.bound = checkIntersection(tree, tree.bounds); 4515 } 4516 } 4517 4518 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4519 Set<Type> boundSet = new HashSet<>(); 4520 if (bounds.nonEmpty()) { 4521 // accept class or interface or typevar as first bound. 4522 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4523 boundSet.add(types.erasure(bounds.head.type)); 4524 if (bounds.head.type.isErroneous()) { 4525 return bounds.head.type; 4526 } 4527 else if (bounds.head.type.hasTag(TYPEVAR)) { 4528 // if first bound was a typevar, do not accept further bounds. 4529 if (bounds.tail.nonEmpty()) { 4530 log.error(bounds.tail.head.pos(), 4531 Errors.TypeVarMayNotBeFollowedByOtherBounds); 4532 return bounds.head.type; 4533 } 4534 } else { 4535 // if first bound was a class or interface, accept only interfaces 4536 // as further bounds. 4537 for (JCExpression bound : bounds.tail) { 4538 bound.type = checkBase(bound.type, bound, env, false, true, false); 4539 if (bound.type.isErroneous()) { 4540 bounds = List.of(bound); 4541 } 4542 else if (bound.type.hasTag(CLASS)) { 4543 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4544 } 4545 } 4546 } 4547 } 4548 4549 if (bounds.length() == 0) { 4550 return syms.objectType; 4551 } else if (bounds.length() == 1) { 4552 return bounds.head.type; 4553 } else { 4554 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4555 // ... the variable's bound is a class type flagged COMPOUND 4556 // (see comment for TypeVar.bound). 4557 // In this case, generate a class tree that represents the 4558 // bound class, ... 4559 JCExpression extending; 4560 List<JCExpression> implementing; 4561 if (!bounds.head.type.isInterface()) { 4562 extending = bounds.head; 4563 implementing = bounds.tail; 4564 } else { 4565 extending = null; 4566 implementing = bounds; 4567 } 4568 JCClassDecl cd = make.at(tree).ClassDef( 4569 make.Modifiers(PUBLIC | ABSTRACT), 4570 names.empty, List.nil(), 4571 extending, implementing, List.nil()); 4572 4573 ClassSymbol c = (ClassSymbol)owntype.tsym; 4574 Assert.check((c.flags() & COMPOUND) != 0); 4575 cd.sym = c; 4576 c.sourcefile = env.toplevel.sourcefile; 4577 4578 // ... and attribute the bound class 4579 c.flags_field |= UNATTRIBUTED; 4580 Env<AttrContext> cenv = enter.classEnv(cd, env); 4581 typeEnvs.put(c, cenv); 4582 attribClass(c); 4583 return owntype; 4584 } 4585 } 4586 4587 public void visitWildcard(JCWildcard tree) { 4588 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4589 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4590 ? syms.objectType 4591 : attribType(tree.inner, env); 4592 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4593 tree.kind.kind, 4594 syms.boundClass), 4595 KindSelector.TYP, resultInfo); 4596 } 4597 4598 public void visitAnnotation(JCAnnotation tree) { 4599 Assert.error("should be handled in annotate"); 4600 } 4601 4602 public void visitAnnotatedType(JCAnnotatedType tree) { 4603 attribAnnotationTypes(tree.annotations, env); 4604 Type underlyingType = attribType(tree.underlyingType, env); 4605 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4606 4607 if (!env.info.isNewClass) 4608 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4609 result = tree.type = annotatedType; 4610 } 4611 4612 public void visitErroneous(JCErroneous tree) { 4613 if (tree.errs != null) 4614 for (JCTree err : tree.errs) 4615 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4616 result = tree.type = syms.errType; 4617 } 4618 4619 /** Default visitor method for all other trees. 4620 */ 4621 public void visitTree(JCTree tree) { 4622 throw new AssertionError(); 4623 } 4624 4625 /** 4626 * Attribute an env for either a top level tree or class or module declaration. 4627 */ 4628 public void attrib(Env<AttrContext> env) { 4629 switch (env.tree.getTag()) { 4630 case MODULEDEF: 4631 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4632 break; 4633 case TOPLEVEL: 4634 attribTopLevel(env); 4635 break; 4636 case PACKAGEDEF: 4637 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge); 4638 break; 4639 default: 4640 attribClass(env.tree.pos(), env.enclClass.sym); 4641 } 4642 } 4643 4644 /** 4645 * Attribute a top level tree. These trees are encountered when the 4646 * package declaration has annotations. 4647 */ 4648 public void attribTopLevel(Env<AttrContext> env) { 4649 JCCompilationUnit toplevel = env.toplevel; 4650 try { 4651 annotate.flush(); 4652 } catch (CompletionFailure ex) { 4653 chk.completionError(toplevel.pos(), ex); 4654 } 4655 } 4656 4657 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) { 4658 try { 4659 annotate.flush(); 4660 attribPackage(p); 4661 } catch (CompletionFailure ex) { 4662 chk.completionError(pos, ex); 4663 } 4664 } 4665 4666 void attribPackage(PackageSymbol p) { 4667 Env<AttrContext> env = typeEnvs.get(p); 4668 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p); 4669 } 4670 4671 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4672 try { 4673 annotate.flush(); 4674 attribModule(m); 4675 } catch (CompletionFailure ex) { 4676 chk.completionError(pos, ex); 4677 } 4678 } 4679 4680 void attribModule(ModuleSymbol m) { 4681 // Get environment current at the point of module definition. 4682 Env<AttrContext> env = enter.typeEnvs.get(m); 4683 attribStat(env.tree, env); 4684 } 4685 4686 /** Main method: attribute class definition associated with given class symbol. 4687 * reporting completion failures at the given position. 4688 * @param pos The source position at which completion errors are to be 4689 * reported. 4690 * @param c The class symbol whose definition will be attributed. 4691 */ 4692 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4693 try { 4694 annotate.flush(); 4695 attribClass(c); 4696 } catch (CompletionFailure ex) { 4697 chk.completionError(pos, ex); 4698 } 4699 } 4700 4701 /** Attribute class definition associated with given class symbol. 4702 * @param c The class symbol whose definition will be attributed. 4703 */ 4704 void attribClass(ClassSymbol c) throws CompletionFailure { 4705 if (c.type.hasTag(ERROR)) return; 4706 4707 // Check for cycles in the inheritance graph, which can arise from 4708 // ill-formed class files. 4709 chk.checkNonCyclic(null, c.type); 4710 4711 Type st = types.supertype(c.type); 4712 if ((c.flags_field & Flags.COMPOUND) == 0) { 4713 // First, attribute superclass. 4714 if (st.hasTag(CLASS)) 4715 attribClass((ClassSymbol)st.tsym); 4716 4717 // Next attribute owner, if it is a class. 4718 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4719 attribClass((ClassSymbol)c.owner); 4720 } 4721 4722 // The previous operations might have attributed the current class 4723 // if there was a cycle. So we test first whether the class is still 4724 // UNATTRIBUTED. 4725 if ((c.flags_field & UNATTRIBUTED) != 0) { 4726 c.flags_field &= ~UNATTRIBUTED; 4727 4728 // Get environment current at the point of class definition. 4729 Env<AttrContext> env = typeEnvs.get(c); 4730 4731 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4732 // because the annotations were not available at the time the env was created. Therefore, 4733 // we look up the environment chain for the first enclosing environment for which the 4734 // lint value is set. Typically, this is the parent env, but might be further if there 4735 // are any envs created as a result of TypeParameter nodes. 4736 Env<AttrContext> lintEnv = env; 4737 while (lintEnv.info.lint == null) 4738 lintEnv = lintEnv.next; 4739 4740 // Having found the enclosing lint value, we can initialize the lint value for this class 4741 env.info.lint = lintEnv.info.lint.augment(c); 4742 4743 Lint prevLint = chk.setLint(env.info.lint); 4744 JavaFileObject prev = log.useSource(c.sourcefile); 4745 ResultInfo prevReturnRes = env.info.returnResult; 4746 4747 try { 4748 deferredLintHandler.flush(env.tree); 4749 env.info.returnResult = null; 4750 // java.lang.Enum may not be subclassed by a non-enum 4751 if (st.tsym == syms.enumSym && 4752 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4753 log.error(env.tree.pos(), Errors.EnumNoSubclassing); 4754 4755 // Enums may not be extended by source-level classes 4756 if (st.tsym != null && 4757 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4758 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4759 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible); 4760 } 4761 4762 if (isSerializable(c.type)) { 4763 env.info.isSerializable = true; 4764 } 4765 4766 attribClassBody(env, c); 4767 4768 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4769 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4770 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4771 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree); 4772 } finally { 4773 env.info.returnResult = prevReturnRes; 4774 log.useSource(prev); 4775 chk.setLint(prevLint); 4776 } 4777 4778 } 4779 } 4780 4781 public void visitImport(JCImport tree) { 4782 // nothing to do 4783 } 4784 4785 public void visitModuleDef(JCModuleDecl tree) { 4786 tree.sym.completeUsesProvides(); 4787 ModuleSymbol msym = tree.sym; 4788 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym); 4789 Lint prevLint = chk.setLint(lint); 4790 chk.checkModuleName(tree); 4791 chk.checkDeprecatedAnnotation(tree, msym); 4792 4793 try { 4794 deferredLintHandler.flush(tree.pos()); 4795 } finally { 4796 chk.setLint(prevLint); 4797 } 4798 } 4799 4800 /** Finish the attribution of a class. */ 4801 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4802 JCClassDecl tree = (JCClassDecl)env.tree; 4803 Assert.check(c == tree.sym); 4804 4805 // Validate type parameters, supertype and interfaces. 4806 attribStats(tree.typarams, env); 4807 if (!c.isAnonymous()) { 4808 //already checked if anonymous 4809 chk.validate(tree.typarams, env); 4810 chk.validate(tree.extending, env); 4811 chk.validate(tree.implementing, env); 4812 } 4813 4814 c.markAbstractIfNeeded(types); 4815 4816 // If this is a non-abstract class, check that it has no abstract 4817 // methods or unimplemented methods of an implemented interface. 4818 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4819 chk.checkAllDefined(tree.pos(), c); 4820 } 4821 4822 if ((c.flags() & ANNOTATION) != 0) { 4823 if (tree.implementing.nonEmpty()) 4824 log.error(tree.implementing.head.pos(), 4825 Errors.CantExtendIntfAnnotation); 4826 if (tree.typarams.nonEmpty()) { 4827 log.error(tree.typarams.head.pos(), 4828 Errors.IntfAnnotationCantHaveTypeParams(c)); 4829 } 4830 4831 // If this annotation type has a @Repeatable, validate 4832 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4833 // If this annotation type has a @Repeatable, validate 4834 if (repeatable != null) { 4835 // get diagnostic position for error reporting 4836 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4837 Assert.checkNonNull(cbPos); 4838 4839 chk.validateRepeatable(c, repeatable, cbPos); 4840 } 4841 } else { 4842 // Check that all extended classes and interfaces 4843 // are compatible (i.e. no two define methods with same arguments 4844 // yet different return types). (JLS 8.4.6.3) 4845 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4846 if (allowDefaultMethods) { 4847 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4848 } 4849 } 4850 4851 // Check that class does not import the same parameterized interface 4852 // with two different argument lists. 4853 chk.checkClassBounds(tree.pos(), c.type); 4854 4855 tree.type = c.type; 4856 4857 for (List<JCTypeParameter> l = tree.typarams; 4858 l.nonEmpty(); l = l.tail) { 4859 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4860 } 4861 4862 // Check that a generic class doesn't extend Throwable 4863 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4864 log.error(tree.extending.pos(), Errors.GenericThrowable); 4865 4866 // Check that all methods which implement some 4867 // method conform to the method they implement. 4868 chk.checkImplementations(tree); 4869 4870 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4871 checkAutoCloseable(tree.pos(), env, c.type); 4872 4873 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4874 // Attribute declaration 4875 attribStat(l.head, env); 4876 // Check that declarations in inner classes are not static (JLS 8.1.2) 4877 // Make an exception for static constants. 4878 if (c.owner.kind != PCK && 4879 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4880 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4881 Symbol sym = null; 4882 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4883 if (sym == null || 4884 sym.kind != VAR || 4885 ((VarSymbol) sym).getConstValue() == null) 4886 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c)); 4887 } 4888 } 4889 4890 // Check for cycles among non-initial constructors. 4891 chk.checkCyclicConstructors(tree); 4892 4893 // Check for cycles among annotation elements. 4894 chk.checkNonCyclicElements(tree); 4895 4896 // Check for proper use of serialVersionUID 4897 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4898 && isSerializable(c.type) 4899 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0 4900 && !c.isAnonymous()) { 4901 checkSerialVersionUID(tree, c); 4902 } 4903 if (allowTypeAnnos) { 4904 // Correctly organize the postions of the type annotations 4905 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4906 4907 // Check type annotations applicability rules 4908 validateTypeAnnotations(tree, false); 4909 } 4910 } 4911 // where 4912 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4913 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4914 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4915 if (types.isSameType(al.head.annotationType.type, t)) 4916 return al.head.pos(); 4917 } 4918 4919 return null; 4920 } 4921 4922 /** check if a type is a subtype of Serializable, if that is available. */ 4923 boolean isSerializable(Type t) { 4924 try { 4925 syms.serializableType.complete(); 4926 } 4927 catch (CompletionFailure e) { 4928 return false; 4929 } 4930 return types.isSubtype(t, syms.serializableType); 4931 } 4932 4933 /** Check that an appropriate serialVersionUID member is defined. */ 4934 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4935 4936 // check for presence of serialVersionUID 4937 VarSymbol svuid = null; 4938 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4939 if (sym.kind == VAR) { 4940 svuid = (VarSymbol)sym; 4941 break; 4942 } 4943 } 4944 4945 if (svuid == null) { 4946 log.warning(LintCategory.SERIAL, 4947 tree.pos(), Warnings.MissingSVUID(c)); 4948 return; 4949 } 4950 4951 // check that it is static final 4952 if ((svuid.flags() & (STATIC | FINAL)) != 4953 (STATIC | FINAL)) 4954 log.warning(LintCategory.SERIAL, 4955 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c)); 4956 4957 // check that it is long 4958 else if (!svuid.type.hasTag(LONG)) 4959 log.warning(LintCategory.SERIAL, 4960 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c)); 4961 4962 // check constant 4963 else if (svuid.getConstValue() == null) 4964 log.warning(LintCategory.SERIAL, 4965 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c)); 4966 } 4967 4968 private Type capture(Type type) { 4969 return types.capture(type); 4970 } 4971 4972 private void setSyntheticVariableType(JCVariableDecl tree, Type type) { 4973 if (type.isErroneous()) { 4974 tree.vartype = make.at(Position.NOPOS).Erroneous(); 4975 } else { 4976 tree.vartype = make.at(Position.NOPOS).Type(type); 4977 } 4978 } 4979 4980 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4981 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4982 } 4983 //where 4984 private final class TypeAnnotationsValidator extends TreeScanner { 4985 4986 private final boolean sigOnly; 4987 public TypeAnnotationsValidator(boolean sigOnly) { 4988 this.sigOnly = sigOnly; 4989 } 4990 4991 public void visitAnnotation(JCAnnotation tree) { 4992 chk.validateTypeAnnotation(tree, false); 4993 super.visitAnnotation(tree); 4994 } 4995 public void visitAnnotatedType(JCAnnotatedType tree) { 4996 if (!tree.underlyingType.type.isErroneous()) { 4997 super.visitAnnotatedType(tree); 4998 } 4999 } 5000 public void visitTypeParameter(JCTypeParameter tree) { 5001 chk.validateTypeAnnotations(tree.annotations, true); 5002 scan(tree.bounds); 5003 // Don't call super. 5004 // This is needed because above we call validateTypeAnnotation with 5005 // false, which would forbid annotations on type parameters. 5006 // super.visitTypeParameter(tree); 5007 } 5008 public void visitMethodDef(JCMethodDecl tree) { 5009 if (tree.recvparam != null && 5010 !tree.recvparam.vartype.type.isErroneous()) { 5011 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 5012 tree.recvparam.vartype.type.tsym); 5013 } 5014 if (tree.restype != null && tree.restype.type != null) { 5015 validateAnnotatedType(tree.restype, tree.restype.type); 5016 } 5017 if (sigOnly) { 5018 scan(tree.mods); 5019 scan(tree.restype); 5020 scan(tree.typarams); 5021 scan(tree.recvparam); 5022 scan(tree.params); 5023 scan(tree.thrown); 5024 } else { 5025 scan(tree.defaultValue); 5026 scan(tree.body); 5027 } 5028 } 5029 public void visitVarDef(final JCVariableDecl tree) { 5030 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 5031 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped()) 5032 validateAnnotatedType(tree.vartype, tree.sym.type); 5033 scan(tree.mods); 5034 scan(tree.vartype); 5035 if (!sigOnly) { 5036 scan(tree.init); 5037 } 5038 } 5039 public void visitTypeCast(JCTypeCast tree) { 5040 if (tree.clazz != null && tree.clazz.type != null) 5041 validateAnnotatedType(tree.clazz, tree.clazz.type); 5042 super.visitTypeCast(tree); 5043 } 5044 public void visitTypeTest(JCInstanceOf tree) { 5045 if (tree.clazz != null && tree.clazz.type != null) 5046 validateAnnotatedType(tree.clazz, tree.clazz.type); 5047 super.visitTypeTest(tree); 5048 } 5049 public void visitNewClass(JCNewClass tree) { 5050 if (tree.clazz != null && tree.clazz.type != null) { 5051 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 5052 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 5053 tree.clazz.type.tsym); 5054 } 5055 if (tree.def != null) { 5056 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 5057 } 5058 5059 validateAnnotatedType(tree.clazz, tree.clazz.type); 5060 } 5061 super.visitNewClass(tree); 5062 } 5063 public void visitNewArray(JCNewArray tree) { 5064 if (tree.elemtype != null && tree.elemtype.type != null) { 5065 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 5066 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 5067 tree.elemtype.type.tsym); 5068 } 5069 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 5070 } 5071 super.visitNewArray(tree); 5072 } 5073 public void visitClassDef(JCClassDecl tree) { 5074 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 5075 if (sigOnly) { 5076 scan(tree.mods); 5077 scan(tree.typarams); 5078 scan(tree.extending); 5079 scan(tree.implementing); 5080 } 5081 for (JCTree member : tree.defs) { 5082 if (member.hasTag(Tag.CLASSDEF)) { 5083 continue; 5084 } 5085 scan(member); 5086 } 5087 } 5088 public void visitBlock(JCBlock tree) { 5089 if (!sigOnly) { 5090 scan(tree.stats); 5091 } 5092 } 5093 5094 /* I would want to model this after 5095 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 5096 * and override visitSelect and visitTypeApply. 5097 * However, we only set the annotated type in the top-level type 5098 * of the symbol. 5099 * Therefore, we need to override each individual location where a type 5100 * can occur. 5101 */ 5102 private void validateAnnotatedType(final JCTree errtree, final Type type) { 5103 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 5104 5105 if (type.isPrimitiveOrVoid()) { 5106 return; 5107 } 5108 5109 JCTree enclTr = errtree; 5110 Type enclTy = type; 5111 5112 boolean repeat = true; 5113 while (repeat) { 5114 if (enclTr.hasTag(TYPEAPPLY)) { 5115 List<Type> tyargs = enclTy.getTypeArguments(); 5116 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 5117 if (trargs.length() > 0) { 5118 // Nothing to do for diamonds 5119 if (tyargs.length() == trargs.length()) { 5120 for (int i = 0; i < tyargs.length(); ++i) { 5121 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 5122 } 5123 } 5124 // If the lengths don't match, it's either a diamond 5125 // or some nested type that redundantly provides 5126 // type arguments in the tree. 5127 } 5128 5129 // Look at the clazz part of a generic type 5130 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 5131 } 5132 5133 if (enclTr.hasTag(SELECT)) { 5134 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 5135 if (enclTy != null && 5136 !enclTy.hasTag(NONE)) { 5137 enclTy = enclTy.getEnclosingType(); 5138 } 5139 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 5140 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 5141 if (enclTy == null || enclTy.hasTag(NONE)) { 5142 if (at.getAnnotations().size() == 1) { 5143 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute)); 5144 } else { 5145 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 5146 for (JCAnnotation an : at.getAnnotations()) { 5147 comps.add(an.attribute); 5148 } 5149 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList())); 5150 } 5151 repeat = false; 5152 } 5153 enclTr = at.underlyingType; 5154 // enclTy doesn't need to be changed 5155 } else if (enclTr.hasTag(IDENT)) { 5156 repeat = false; 5157 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 5158 JCWildcard wc = (JCWildcard) enclTr; 5159 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD || 5160 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 5161 validateAnnotatedType(wc.getBound(), wc.getBound().type); 5162 } else { 5163 // Nothing to do for UNBOUND 5164 } 5165 repeat = false; 5166 } else if (enclTr.hasTag(TYPEARRAY)) { 5167 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 5168 validateAnnotatedType(art.getType(), art.elemtype.type); 5169 repeat = false; 5170 } else if (enclTr.hasTag(TYPEUNION)) { 5171 JCTypeUnion ut = (JCTypeUnion) enclTr; 5172 for (JCTree t : ut.getTypeAlternatives()) { 5173 validateAnnotatedType(t, t.type); 5174 } 5175 repeat = false; 5176 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 5177 JCTypeIntersection it = (JCTypeIntersection) enclTr; 5178 for (JCTree t : it.getBounds()) { 5179 validateAnnotatedType(t, t.type); 5180 } 5181 repeat = false; 5182 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 5183 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 5184 repeat = false; 5185 } else { 5186 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 5187 " within: "+ errtree + " with kind: " + errtree.getKind()); 5188 } 5189 } 5190 } 5191 5192 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 5193 Symbol sym) { 5194 // Ensure that no declaration annotations are present. 5195 // Note that a tree type might be an AnnotatedType with 5196 // empty annotations, if only declaration annotations were given. 5197 // This method will raise an error for such a type. 5198 for (JCAnnotation ai : annotations) { 5199 if (!ai.type.isErroneous() && 5200 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 5201 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 5202 } 5203 } 5204 } 5205 } 5206 5207 // <editor-fold desc="post-attribution visitor"> 5208 5209 /** 5210 * Handle missing types/symbols in an AST. This routine is useful when 5211 * the compiler has encountered some errors (which might have ended up 5212 * terminating attribution abruptly); if the compiler is used in fail-over 5213 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 5214 * prevents NPE to be progagated during subsequent compilation steps. 5215 */ 5216 public void postAttr(JCTree tree) { 5217 new PostAttrAnalyzer().scan(tree); 5218 } 5219 5220 class PostAttrAnalyzer extends TreeScanner { 5221 5222 private void initTypeIfNeeded(JCTree that) { 5223 if (that.type == null) { 5224 if (that.hasTag(METHODDEF)) { 5225 that.type = dummyMethodType((JCMethodDecl)that); 5226 } else { 5227 that.type = syms.unknownType; 5228 } 5229 } 5230 } 5231 5232 /* Construct a dummy method type. If we have a method declaration, 5233 * and the declared return type is void, then use that return type 5234 * instead of UNKNOWN to avoid spurious error messages in lambda 5235 * bodies (see:JDK-8041704). 5236 */ 5237 private Type dummyMethodType(JCMethodDecl md) { 5238 Type restype = syms.unknownType; 5239 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) { 5240 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 5241 if (prim.typetag == VOID) 5242 restype = syms.voidType; 5243 } 5244 return new MethodType(List.nil(), restype, 5245 List.nil(), syms.methodClass); 5246 } 5247 private Type dummyMethodType() { 5248 return dummyMethodType(null); 5249 } 5250 5251 @Override 5252 public void scan(JCTree tree) { 5253 if (tree == null) return; 5254 if (tree instanceof JCExpression) { 5255 initTypeIfNeeded(tree); 5256 } 5257 super.scan(tree); 5258 } 5259 5260 @Override 5261 public void visitIdent(JCIdent that) { 5262 if (that.sym == null) { 5263 that.sym = syms.unknownSymbol; 5264 } 5265 } 5266 5267 @Override 5268 public void visitSelect(JCFieldAccess that) { 5269 if (that.sym == null) { 5270 that.sym = syms.unknownSymbol; 5271 } 5272 super.visitSelect(that); 5273 } 5274 5275 @Override 5276 public void visitClassDef(JCClassDecl that) { 5277 initTypeIfNeeded(that); 5278 if (that.sym == null) { 5279 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 5280 } 5281 super.visitClassDef(that); 5282 } 5283 5284 @Override 5285 public void visitMethodDef(JCMethodDecl that) { 5286 initTypeIfNeeded(that); 5287 if (that.sym == null) { 5288 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 5289 } 5290 super.visitMethodDef(that); 5291 } 5292 5293 @Override 5294 public void visitVarDef(JCVariableDecl that) { 5295 initTypeIfNeeded(that); 5296 if (that.sym == null) { 5297 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 5298 that.sym.adr = 0; 5299 } 5300 if (that.vartype == null) { 5301 that.vartype = make.at(Position.NOPOS).Erroneous(); 5302 } 5303 super.visitVarDef(that); 5304 } 5305 5306 @Override 5307 public void visitNewClass(JCNewClass that) { 5308 if (that.constructor == null) { 5309 that.constructor = new MethodSymbol(0, names.init, 5310 dummyMethodType(), syms.noSymbol); 5311 } 5312 if (that.constructorType == null) { 5313 that.constructorType = syms.unknownType; 5314 } 5315 super.visitNewClass(that); 5316 } 5317 5318 @Override 5319 public void visitAssignop(JCAssignOp that) { 5320 if (that.operator == null) { 5321 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5322 -1, syms.noSymbol); 5323 } 5324 super.visitAssignop(that); 5325 } 5326 5327 @Override 5328 public void visitBinary(JCBinary that) { 5329 if (that.operator == null) { 5330 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5331 -1, syms.noSymbol); 5332 } 5333 super.visitBinary(that); 5334 } 5335 5336 @Override 5337 public void visitUnary(JCUnary that) { 5338 if (that.operator == null) { 5339 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5340 -1, syms.noSymbol); 5341 } 5342 super.visitUnary(that); 5343 } 5344 5345 @Override 5346 public void visitLambda(JCLambda that) { 5347 super.visitLambda(that); 5348 if (that.target == null) { 5349 that.target = syms.unknownType; 5350 } 5351 } 5352 5353 @Override 5354 public void visitReference(JCMemberReference that) { 5355 super.visitReference(that); 5356 if (that.sym == null) { 5357 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 5358 syms.noSymbol); 5359 } 5360 if (that.target == null) { 5361 that.target = syms.unknownType; 5362 } 5363 } 5364 } 5365 // </editor-fold> 5366 5367 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 5368 new TreeScanner() { 5369 Symbol packge = pkg; 5370 @Override 5371 public void visitIdent(JCIdent that) { 5372 that.sym = packge; 5373 } 5374 5375 @Override 5376 public void visitSelect(JCFieldAccess that) { 5377 that.sym = packge; 5378 packge = packge.owner; 5379 super.visitSelect(that); 5380 } 5381 }.scan(pid); 5382 } 5383 5384 }