1 /* 2 * Copyright (c) 1999, 2023, 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.function.Consumer; 31 import java.util.stream.Stream; 32 33 import javax.lang.model.element.ElementKind; 34 import javax.tools.JavaFileObject; 35 36 import com.sun.source.tree.CaseTree; 37 import com.sun.source.tree.IdentifierTree; 38 import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 39 import com.sun.source.tree.MemberSelectTree; 40 import com.sun.source.tree.TreeVisitor; 41 import com.sun.source.util.SimpleTreeVisitor; 42 import com.sun.tools.javac.code.*; 43 import com.sun.tools.javac.code.Lint.LintCategory; 44 import com.sun.tools.javac.code.Scope.WriteableScope; 45 import com.sun.tools.javac.code.Source.Feature; 46 import com.sun.tools.javac.code.Symbol.*; 47 import com.sun.tools.javac.code.Type.*; 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.comp.MatchBindingsComputer.MatchBindings; 53 import com.sun.tools.javac.jvm.*; 54 55 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 56 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 57 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 58 59 import com.sun.tools.javac.resources.CompilerProperties.Errors; 60 import com.sun.tools.javac.resources.CompilerProperties.Fragments; 61 import com.sun.tools.javac.resources.CompilerProperties.Warnings; 62 import com.sun.tools.javac.tree.*; 63 import com.sun.tools.javac.tree.JCTree.*; 64 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 65 import com.sun.tools.javac.util.*; 66 import com.sun.tools.javac.util.DefinedBy.Api; 67 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 68 import com.sun.tools.javac.util.JCDiagnostic.Error; 69 import com.sun.tools.javac.util.JCDiagnostic.Fragment; 70 import com.sun.tools.javac.util.JCDiagnostic.Warning; 71 import com.sun.tools.javac.util.List; 72 73 import static com.sun.tools.javac.code.Flags.*; 74 import static com.sun.tools.javac.code.Flags.ANNOTATION; 75 import static com.sun.tools.javac.code.Flags.BLOCK; 76 import static com.sun.tools.javac.code.Kinds.*; 77 import static com.sun.tools.javac.code.Kinds.Kind.*; 78 import static com.sun.tools.javac.code.TypeTag.*; 79 import static com.sun.tools.javac.code.TypeTag.WILDCARD; 80 import static com.sun.tools.javac.tree.JCTree.Tag.*; 81 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 82 83 /** This is the main context-dependent analysis phase in GJC. It 84 * encompasses name resolution, type checking and constant folding as 85 * subtasks. Some subtasks involve auxiliary classes. 86 * @see Check 87 * @see Resolve 88 * @see ConstFold 89 * @see Infer 90 * 91 * <p><b>This is NOT part of any supported API. 92 * If you write code that depends on this, you do so at your own risk. 93 * This code and its internal interfaces are subject to change or 94 * deletion without notice.</b> 95 */ 96 public class Attr extends JCTree.Visitor { 97 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 98 99 final Names names; 100 final Log log; 101 final Symtab syms; 102 final Resolve rs; 103 final Operators operators; 104 final Infer infer; 105 final Analyzer analyzer; 106 final DeferredAttr deferredAttr; 107 final Check chk; 108 final Flow flow; 109 final MemberEnter memberEnter; 110 final TypeEnter typeEnter; 111 final TreeMaker make; 112 final ConstFold cfolder; 113 final Enter enter; 114 final Target target; 115 final Types types; 116 final Preview preview; 117 final JCDiagnostic.Factory diags; 118 final TypeAnnotations typeAnnotations; 119 final DeferredLintHandler deferredLintHandler; 120 final TypeEnvs typeEnvs; 121 final Dependencies dependencies; 122 final Annotate annotate; 123 final ArgumentAttr argumentAttr; 124 final MatchBindingsComputer matchBindingsComputer; 125 final AttrRecover attrRecover; 126 127 public static Attr instance(Context context) { 128 Attr instance = context.get(attrKey); 129 if (instance == null) 130 instance = new Attr(context); 131 return instance; 132 } 133 134 @SuppressWarnings("this-escape") 135 protected Attr(Context context) { 136 context.put(attrKey, this); 137 138 names = Names.instance(context); 139 log = Log.instance(context); 140 syms = Symtab.instance(context); 141 rs = Resolve.instance(context); 142 operators = Operators.instance(context); 143 chk = Check.instance(context); 144 flow = Flow.instance(context); 145 memberEnter = MemberEnter.instance(context); 146 typeEnter = TypeEnter.instance(context); 147 make = TreeMaker.instance(context); 148 enter = Enter.instance(context); 149 infer = Infer.instance(context); 150 analyzer = Analyzer.instance(context); 151 deferredAttr = DeferredAttr.instance(context); 152 cfolder = ConstFold.instance(context); 153 target = Target.instance(context); 154 types = Types.instance(context); 155 preview = Preview.instance(context); 156 diags = JCDiagnostic.Factory.instance(context); 157 annotate = Annotate.instance(context); 158 typeAnnotations = TypeAnnotations.instance(context); 159 deferredLintHandler = DeferredLintHandler.instance(context); 160 typeEnvs = TypeEnvs.instance(context); 161 dependencies = Dependencies.instance(context); 162 argumentAttr = ArgumentAttr.instance(context); 163 matchBindingsComputer = MatchBindingsComputer.instance(context); 164 attrRecover = AttrRecover.instance(context); 165 166 Options options = Options.instance(context); 167 168 Source source = Source.instance(context); 169 allowReifiableTypesInInstanceof = Feature.REIFIABLE_TYPES_INSTANCEOF.allowedInSource(source); 170 allowRecords = Feature.RECORDS.allowedInSource(source); 171 allowPatternSwitch = (preview.isEnabled() || !preview.isPreview(Feature.PATTERN_SWITCH)) && 172 Feature.PATTERN_SWITCH.allowedInSource(source); 173 allowUnconditionalPatternsInstanceOf = 174 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.allowedInSource(source); 175 sourceName = source.name; 176 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 177 178 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 179 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 180 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 181 methodAttrInfo = new MethodAttrInfo(); 182 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 183 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 184 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 185 } 186 187 /** Switch: reifiable types in instanceof enabled? 188 */ 189 boolean allowReifiableTypesInInstanceof; 190 191 /** Are records allowed 192 */ 193 private final boolean allowRecords; 194 195 /** Are patterns in switch allowed 196 */ 197 private final boolean allowPatternSwitch; 198 199 /** Are unconditional patterns in instanceof allowed 200 */ 201 private final boolean allowUnconditionalPatternsInstanceOf; 202 203 /** 204 * Switch: warn about use of variable before declaration? 205 * RFE: 6425594 206 */ 207 boolean useBeforeDeclarationWarning; 208 209 /** 210 * Switch: name of source level; used for error reporting. 211 */ 212 String sourceName; 213 214 /** Check kind and type of given tree against protokind and prototype. 215 * If check succeeds, store type in tree and return it. 216 * If check fails, store errType in tree and return it. 217 * No checks are performed if the prototype is a method type. 218 * It is not necessary in this case since we know that kind and type 219 * are correct. 220 * 221 * @param tree The tree whose kind and type is checked 222 * @param found The computed type of the tree 223 * @param ownkind The computed kind of the tree 224 * @param resultInfo The expected result of the tree 225 */ 226 Type check(final JCTree tree, 227 final Type found, 228 final KindSelector ownkind, 229 final ResultInfo resultInfo) { 230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 231 Type owntype; 232 boolean shouldCheck = !found.hasTag(ERROR) && 233 !resultInfo.pt.hasTag(METHOD) && 234 !resultInfo.pt.hasTag(FORALL); 235 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 236 log.error(tree.pos(), 237 Errors.UnexpectedType(resultInfo.pkind.kindNames(), 238 ownkind.kindNames())); 239 owntype = types.createErrorType(found); 240 } else if (inferenceContext.free(found)) { 241 //delay the check if there are inference variables in the found type 242 //this means we are dealing with a partially inferred poly expression 243 owntype = shouldCheck ? resultInfo.pt : found; 244 if (resultInfo.checkMode.installPostInferenceHook()) { 245 inferenceContext.addFreeTypeListener(List.of(found), 246 instantiatedContext -> { 247 ResultInfo pendingResult = 248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 250 }); 251 } 252 } else { 253 owntype = shouldCheck ? 254 resultInfo.check(tree, found) : 255 found; 256 } 257 if (resultInfo.checkMode.updateTreeType()) { 258 tree.type = owntype; 259 } 260 return owntype; 261 } 262 263 /** Is given blank final variable assignable, i.e. in a scope where it 264 * may be assigned to even though it is final? 265 * @param v The blank final variable. 266 * @param env The current environment. 267 */ 268 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 269 Symbol owner = env.info.scope.owner; 270 // owner refers to the innermost variable, method or 271 // initializer block declaration at this point. 272 boolean isAssignable = 273 v.owner == owner 274 || 275 ((owner.name == names.init || // i.e. we are in a constructor 276 owner.kind == VAR || // i.e. we are in a variable initializer 277 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 278 && 279 v.owner == owner.owner 280 && 281 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 282 boolean insideCompactConstructor = env.enclMethod != null && TreeInfo.isCompactConstructor(env.enclMethod); 283 return isAssignable & !insideCompactConstructor; 284 } 285 286 /** Check that variable can be assigned to. 287 * @param pos The current source code position. 288 * @param v The assigned variable 289 * @param base If the variable is referred to in a Select, the part 290 * to the left of the `.', null otherwise. 291 * @param env The current environment. 292 */ 293 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 294 if (v.name == names._this) { 295 log.error(pos, Errors.CantAssignValToThis); 296 } else if ((v.flags() & FINAL) != 0 && 297 ((v.flags() & HASINIT) != 0 298 || 299 !((base == null || 300 TreeInfo.isThisQualifier(base)) && 301 isAssignableAsBlankFinal(v, env)))) { 302 if (v.isResourceVariable()) { //TWR resource 303 log.error(pos, Errors.TryResourceMayNotBeAssigned(v)); 304 } else { 305 log.error(pos, Errors.CantAssignValToVar(Flags.toSource(v.flags() & (STATIC | FINAL)), v)); 306 } 307 } 308 309 if (!env.info.ctorPrologue && 310 v.owner.isValueClass() && 311 !env.info.instanceInitializerBlock && // it is OK instance initializer blocks will go after super() anyways 312 v.owner.kind == TYP && 313 v.owner == env.enclClass.sym && 314 (v.flags() & STATIC) == 0 && 315 (base == null || 316 TreeInfo.isExplicitThisReference(types, (ClassType)env.enclClass.type, base))) { 317 log.error(pos, Errors.CantRefAfterCtorCalled(v)); 318 } 319 } 320 321 /** Does tree represent a static reference to an identifier? 322 * It is assumed that tree is either a SELECT or an IDENT. 323 * We have to weed out selects from non-type names here. 324 * @param tree The candidate tree. 325 */ 326 boolean isStaticReference(JCTree tree) { 327 if (tree.hasTag(SELECT)) { 328 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 329 if (lsym == null || lsym.kind != TYP) { 330 return false; 331 } 332 } 333 return true; 334 } 335 336 /** Is this symbol a type? 337 */ 338 static boolean isType(Symbol sym) { 339 return sym != null && sym.kind == TYP; 340 } 341 342 /** The current `this' symbol. 343 * @param env The current environment. 344 */ 345 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 346 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 347 } 348 349 /** Attribute a parsed identifier. 350 * @param tree Parsed identifier name 351 * @param topLevel The toplevel to use 352 */ 353 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 354 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 355 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 356 syms.errSymbol.name, 357 null, null, null, null); 358 localEnv.enclClass.sym = syms.errSymbol; 359 return attribIdent(tree, localEnv); 360 } 361 362 /** Attribute a parsed identifier. 363 * @param tree Parsed identifier name 364 * @param env The env to use 365 */ 366 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 367 return tree.accept(identAttributer, env); 368 } 369 // where 370 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 371 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 372 @Override @DefinedBy(Api.COMPILER_TREE) 373 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 374 Symbol site = visit(node.getExpression(), env); 375 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN) 376 return site; 377 Name name = (Name)node.getIdentifier(); 378 if (site.kind == PCK) { 379 env.toplevel.packge = (PackageSymbol)site; 380 return rs.findIdentInPackage(null, env, (TypeSymbol)site, name, 381 KindSelector.TYP_PCK); 382 } else { 383 env.enclClass.sym = (ClassSymbol)site; 384 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 385 } 386 } 387 388 @Override @DefinedBy(Api.COMPILER_TREE) 389 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 390 return rs.findIdent(null, env, (Name)node.getName(), KindSelector.TYP_PCK); 391 } 392 } 393 394 public Type coerce(Type etype, Type ttype) { 395 return cfolder.coerce(etype, ttype); 396 } 397 398 public Type attribType(JCTree node, TypeSymbol sym) { 399 Env<AttrContext> env = typeEnvs.get(sym); 400 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 401 return attribTree(node, localEnv, unknownTypeInfo); 402 } 403 404 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 405 // Attribute qualifying package or class. 406 JCFieldAccess s = tree.qualid; 407 return attribTree(s.selected, env, 408 new ResultInfo(tree.staticImport ? 409 KindSelector.TYP : KindSelector.TYP_PCK, 410 Type.noType)); 411 } 412 413 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 414 return attribToTree(expr, env, tree, unknownExprInfo); 415 } 416 417 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 418 return attribToTree(stmt, env, tree, statInfo); 419 } 420 421 private Env<AttrContext> attribToTree(JCTree root, Env<AttrContext> env, JCTree tree, ResultInfo resultInfo) { 422 breakTree = tree; 423 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 424 try { 425 deferredAttr.attribSpeculative(root, env, resultInfo, 426 null, DeferredAttr.AttributionMode.ATTRIB_TO_TREE, 427 argumentAttr.withLocalCacheContext()); 428 attrRecover.doRecovery(); 429 } catch (BreakAttr b) { 430 return b.env; 431 } catch (AssertionError ae) { 432 if (ae.getCause() instanceof BreakAttr breakAttr) { 433 return breakAttr.env; 434 } else { 435 throw ae; 436 } 437 } finally { 438 breakTree = null; 439 log.useSource(prev); 440 } 441 return env; 442 } 443 444 private JCTree breakTree = null; 445 446 private static class BreakAttr extends RuntimeException { 447 static final long serialVersionUID = -6924771130405446405L; 448 private transient Env<AttrContext> env; 449 private BreakAttr(Env<AttrContext> env) { 450 this.env = env; 451 } 452 } 453 454 /** 455 * Mode controlling behavior of Attr.Check 456 */ 457 enum CheckMode { 458 459 NORMAL, 460 461 /** 462 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is 463 * that the captured var cache in {@code InferenceContext} will be used in read-only 464 * mode when performing inference checks. 465 */ 466 NO_TREE_UPDATE { 467 @Override 468 public boolean updateTreeType() { 469 return false; 470 } 471 }, 472 /** 473 * Mode signalling that caller will manage free types in tree decorations. 474 */ 475 NO_INFERENCE_HOOK { 476 @Override 477 public boolean installPostInferenceHook() { 478 return false; 479 } 480 }; 481 482 public boolean updateTreeType() { 483 return true; 484 } 485 public boolean installPostInferenceHook() { 486 return true; 487 } 488 } 489 490 491 class ResultInfo { 492 final KindSelector pkind; 493 final Type pt; 494 final CheckContext checkContext; 495 final CheckMode checkMode; 496 497 ResultInfo(KindSelector pkind, Type pt) { 498 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 499 } 500 501 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 502 this(pkind, pt, chk.basicHandler, checkMode); 503 } 504 505 protected ResultInfo(KindSelector pkind, 506 Type pt, CheckContext checkContext) { 507 this(pkind, pt, checkContext, CheckMode.NORMAL); 508 } 509 510 protected ResultInfo(KindSelector pkind, 511 Type pt, CheckContext checkContext, CheckMode checkMode) { 512 this.pkind = pkind; 513 this.pt = pt; 514 this.checkContext = checkContext; 515 this.checkMode = checkMode; 516 } 517 518 /** 519 * Should {@link Attr#attribTree} use the {@code ArgumentAttr} visitor instead of this one? 520 * @param tree The tree to be type-checked. 521 * @return true if {@code ArgumentAttr} should be used. 522 */ 523 protected boolean needsArgumentAttr(JCTree tree) { return false; } 524 525 protected Type check(final DiagnosticPosition pos, final Type found) { 526 return chk.checkType(pos, found, pt, checkContext); 527 } 528 529 protected ResultInfo dup(Type newPt) { 530 return new ResultInfo(pkind, newPt, checkContext, checkMode); 531 } 532 533 protected ResultInfo dup(CheckContext newContext) { 534 return new ResultInfo(pkind, pt, newContext, checkMode); 535 } 536 537 protected ResultInfo dup(Type newPt, CheckContext newContext) { 538 return new ResultInfo(pkind, newPt, newContext, checkMode); 539 } 540 541 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 542 return new ResultInfo(pkind, newPt, newContext, newMode); 543 } 544 545 protected ResultInfo dup(CheckMode newMode) { 546 return new ResultInfo(pkind, pt, checkContext, newMode); 547 } 548 549 @Override 550 public String toString() { 551 if (pt != null) { 552 return pt.toString(); 553 } else { 554 return ""; 555 } 556 } 557 } 558 559 class MethodAttrInfo extends ResultInfo { 560 public MethodAttrInfo() { 561 this(chk.basicHandler); 562 } 563 564 public MethodAttrInfo(CheckContext checkContext) { 565 super(KindSelector.VAL, Infer.anyPoly, checkContext); 566 } 567 568 @Override 569 protected boolean needsArgumentAttr(JCTree tree) { 570 return true; 571 } 572 573 protected ResultInfo dup(Type newPt) { 574 throw new IllegalStateException(); 575 } 576 577 protected ResultInfo dup(CheckContext newContext) { 578 return new MethodAttrInfo(newContext); 579 } 580 581 protected ResultInfo dup(Type newPt, CheckContext newContext) { 582 throw new IllegalStateException(); 583 } 584 585 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 586 throw new IllegalStateException(); 587 } 588 589 protected ResultInfo dup(CheckMode newMode) { 590 throw new IllegalStateException(); 591 } 592 } 593 594 class RecoveryInfo extends ResultInfo { 595 596 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 597 this(deferredAttrContext, Type.recoveryType); 598 } 599 600 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) { 601 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) { 602 @Override 603 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 604 return deferredAttrContext; 605 } 606 @Override 607 public boolean compatible(Type found, Type req, Warner warn) { 608 return true; 609 } 610 @Override 611 public void report(DiagnosticPosition pos, JCDiagnostic details) { 612 boolean needsReport = pt == Type.recoveryType || 613 (details.getDiagnosticPosition() != null && 614 details.getDiagnosticPosition().getTree().hasTag(LAMBDA)); 615 if (needsReport) { 616 chk.basicHandler.report(pos, details); 617 } 618 } 619 }); 620 } 621 } 622 623 final ResultInfo statInfo; 624 final ResultInfo varAssignmentInfo; 625 final ResultInfo methodAttrInfo; 626 final ResultInfo unknownExprInfo; 627 final ResultInfo unknownTypeInfo; 628 final ResultInfo unknownTypeExprInfo; 629 final ResultInfo recoveryInfo; 630 631 Type pt() { 632 return resultInfo.pt; 633 } 634 635 KindSelector pkind() { 636 return resultInfo.pkind; 637 } 638 639 /* ************************************************************************ 640 * Visitor methods 641 *************************************************************************/ 642 643 /** Visitor argument: the current environment. 644 */ 645 Env<AttrContext> env; 646 647 /** Visitor argument: the currently expected attribution result. 648 */ 649 ResultInfo resultInfo; 650 651 /** Visitor result: the computed type. 652 */ 653 Type result; 654 655 MatchBindings matchBindings = MatchBindingsComputer.EMPTY; 656 657 /** Visitor method: attribute a tree, catching any completion failure 658 * exceptions. Return the tree's type. 659 * 660 * @param tree The tree to be visited. 661 * @param env The environment visitor argument. 662 * @param resultInfo The result info visitor argument. 663 */ 664 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 665 Env<AttrContext> prevEnv = this.env; 666 ResultInfo prevResult = this.resultInfo; 667 try { 668 this.env = env; 669 this.resultInfo = resultInfo; 670 if (resultInfo.needsArgumentAttr(tree)) { 671 result = argumentAttr.attribArg(tree, env); 672 } else { 673 tree.accept(this); 674 } 675 matchBindings = matchBindingsComputer.finishBindings(tree, 676 matchBindings); 677 if (tree == breakTree && 678 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 679 breakTreeFound(copyEnv(env)); 680 } 681 return result; 682 } catch (CompletionFailure ex) { 683 tree.type = syms.errType; 684 return chk.completionError(tree.pos(), ex); 685 } finally { 686 this.env = prevEnv; 687 this.resultInfo = prevResult; 688 } 689 } 690 691 protected void breakTreeFound(Env<AttrContext> env) { 692 throw new BreakAttr(env); 693 } 694 695 Env<AttrContext> copyEnv(Env<AttrContext> env) { 696 Env<AttrContext> newEnv = 697 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 698 if (newEnv.outer != null) { 699 newEnv.outer = copyEnv(newEnv.outer); 700 } 701 return newEnv; 702 } 703 704 WriteableScope copyScope(WriteableScope sc) { 705 WriteableScope newScope = WriteableScope.create(sc.owner); 706 List<Symbol> elemsList = List.nil(); 707 for (Symbol sym : sc.getSymbols()) { 708 elemsList = elemsList.prepend(sym); 709 } 710 for (Symbol s : elemsList) { 711 newScope.enter(s); 712 } 713 return newScope; 714 } 715 716 /** Derived visitor method: attribute an expression tree. 717 */ 718 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 719 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 720 } 721 722 /** Derived visitor method: attribute an expression tree with 723 * no constraints on the computed type. 724 */ 725 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 726 return attribTree(tree, env, unknownExprInfo); 727 } 728 729 /** Derived visitor method: attribute a type tree. 730 */ 731 public Type attribType(JCTree tree, Env<AttrContext> env) { 732 Type result = attribType(tree, env, Type.noType); 733 return result; 734 } 735 736 /** Derived visitor method: attribute a type tree. 737 */ 738 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 739 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 740 return result; 741 } 742 743 /** Derived visitor method: attribute a statement or definition tree. 744 */ 745 public Type attribStat(JCTree tree, Env<AttrContext> env) { 746 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env); 747 Type result = attribTree(tree, env, statInfo); 748 analyzer.analyzeIfNeeded(tree, analyzeEnv); 749 attrRecover.doRecovery(); 750 return result; 751 } 752 753 /** Attribute a list of expressions, returning a list of types. 754 */ 755 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 756 ListBuffer<Type> ts = new ListBuffer<>(); 757 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 758 ts.append(attribExpr(l.head, env, pt)); 759 return ts.toList(); 760 } 761 762 /** Attribute a list of statements, returning nothing. 763 */ 764 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 765 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 766 attribStat(l.head, env); 767 } 768 769 /** Attribute the arguments in a method call, returning the method kind. 770 */ 771 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 772 KindSelector kind = initialKind; 773 for (JCExpression arg : trees) { 774 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, methodAttrInfo)); 775 if (argtype.hasTag(DEFERRED)) { 776 kind = KindSelector.of(KindSelector.POLY, kind); 777 } 778 argtypes.append(argtype); 779 } 780 return kind; 781 } 782 783 /** Attribute a type argument list, returning a list of types. 784 * Caller is responsible for calling checkRefTypes. 785 */ 786 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 787 ListBuffer<Type> argtypes = new ListBuffer<>(); 788 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 789 argtypes.append(attribType(l.head, env)); 790 return argtypes.toList(); 791 } 792 793 /** Attribute a type argument list, returning a list of types. 794 * Check that all the types are references. 795 */ 796 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 797 List<Type> types = attribAnyTypes(trees, env); 798 return chk.checkRefTypes(trees, types); 799 } 800 801 /** 802 * Attribute type variables (of generic classes or methods). 803 * Compound types are attributed later in attribBounds. 804 * @param typarams the type variables to enter 805 * @param env the current environment 806 */ 807 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env, boolean checkCyclic) { 808 for (JCTypeParameter tvar : typarams) { 809 TypeVar a = (TypeVar)tvar.type; 810 a.tsym.flags_field |= UNATTRIBUTED; 811 a.setUpperBound(Type.noType); 812 if (!tvar.bounds.isEmpty()) { 813 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 814 for (JCExpression bound : tvar.bounds.tail) 815 bounds = bounds.prepend(attribType(bound, env)); 816 types.setBounds(a, bounds.reverse()); 817 } else { 818 // if no bounds are given, assume a single bound of 819 // java.lang.Object. 820 types.setBounds(a, List.of(syms.objectType)); 821 } 822 a.tsym.flags_field &= ~UNATTRIBUTED; 823 } 824 if (checkCyclic) { 825 for (JCTypeParameter tvar : typarams) { 826 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 827 } 828 } 829 } 830 831 /** 832 * Attribute the type references in a list of annotations. 833 */ 834 void attribAnnotationTypes(List<JCAnnotation> annotations, 835 Env<AttrContext> env) { 836 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 837 JCAnnotation a = al.head; 838 attribType(a.annotationType, env); 839 } 840 } 841 842 /** 843 * Attribute a "lazy constant value". 844 * @param env The env for the const value 845 * @param variable The initializer for the const value 846 * @param type The expected type, or null 847 * @see VarSymbol#setLazyConstValue 848 */ 849 public Object attribLazyConstantValue(Env<AttrContext> env, 850 JCVariableDecl variable, 851 Type type) { 852 853 DiagnosticPosition prevLintPos 854 = deferredLintHandler.setPos(variable.pos()); 855 856 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 857 try { 858 Type itype = attribExpr(variable.init, env, type); 859 if (variable.isImplicitlyTyped()) { 860 //fixup local variable type 861 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype, variable.name); 862 } 863 if (itype.constValue() != null) { 864 return coerce(itype, type).constValue(); 865 } else { 866 return null; 867 } 868 } finally { 869 log.useSource(prevSource); 870 deferredLintHandler.setPos(prevLintPos); 871 } 872 } 873 874 /** Attribute type reference in an `extends' or `implements' clause. 875 * Supertypes of anonymous inner classes are usually already attributed. 876 * 877 * @param tree The tree making up the type reference. 878 * @param env The environment current at the reference. 879 * @param classExpected true if only a class is expected here. 880 * @param interfaceExpected true if only an interface is expected here. 881 */ 882 Type attribBase(JCTree tree, 883 Env<AttrContext> env, 884 boolean classExpected, 885 boolean interfaceExpected, 886 boolean checkExtensible) { 887 Type t = tree.type != null ? 888 tree.type : 889 attribType(tree, env); 890 try { 891 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 892 } catch (CompletionFailure ex) { 893 chk.completionError(tree.pos(), ex); 894 return t; 895 } 896 } 897 Type checkBase(Type t, 898 JCTree tree, 899 Env<AttrContext> env, 900 boolean classExpected, 901 boolean interfaceExpected, 902 boolean checkExtensible) { 903 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 904 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 905 if (t.tsym.isAnonymous()) { 906 log.error(pos, Errors.CantInheritFromAnon); 907 return types.createErrorType(t); 908 } 909 if (t.isErroneous()) 910 return t; 911 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 912 // check that type variable is already visible 913 if (t.getUpperBound() == null) { 914 log.error(pos, Errors.IllegalForwardRef); 915 return types.createErrorType(t); 916 } 917 } else { 918 t = chk.checkClassType(pos, t, checkExtensible); 919 } 920 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 921 log.error(pos, Errors.IntfExpectedHere); 922 // return errType is necessary since otherwise there might 923 // be undetected cycles which cause attribution to loop 924 return types.createErrorType(t); 925 } else if (checkExtensible && 926 classExpected && 927 (t.tsym.flags() & INTERFACE) != 0) { 928 log.error(pos, Errors.NoIntfExpectedHere); 929 return types.createErrorType(t); 930 } 931 if (checkExtensible && 932 ((t.tsym.flags() & FINAL) != 0)) { 933 log.error(pos, 934 Errors.CantInheritFromFinal(t.tsym)); 935 } 936 chk.checkNonCyclic(pos, t); 937 return t; 938 } 939 940 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 941 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 942 id.type = env.info.scope.owner.enclClass().type; 943 id.sym = env.info.scope.owner.enclClass(); 944 return id.type; 945 } 946 947 public void visitClassDef(JCClassDecl tree) { 948 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 949 Optional.ofNullable(env.info.attributionMode.isSpeculative ? 950 argumentAttr.withLocalCacheContext() : null); 951 boolean ctorProloguePrev = env.info.ctorPrologue; 952 env.info.ctorPrologue = false; 953 try { 954 // Local and anonymous classes have not been entered yet, so we need to 955 // do it now. 956 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 957 enter.classEnter(tree, env); 958 } else { 959 // If this class declaration is part of a class level annotation, 960 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 961 // order to simplify later steps and allow for sensible error 962 // messages. 963 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 964 enter.classEnter(tree, env); 965 } 966 967 ClassSymbol c = tree.sym; 968 if (c == null) { 969 // exit in case something drastic went wrong during enter. 970 result = null; 971 } else { 972 // make sure class has been completed: 973 c.complete(); 974 975 // If this class appears as an anonymous class in a constructor 976 // prologue, disable implicit outer instance from being passed. 977 // (This would be an illegal access to "this before super"). 978 if (ctorProloguePrev && env.tree.hasTag(NEWCLASS)) { 979 c.flags_field |= NOOUTERTHIS; 980 } 981 attribClass(tree.pos(), c); 982 result = tree.type = c.type; 983 } 984 } finally { 985 localCacheContext.ifPresent(LocalCacheContext::leave); 986 env.info.ctorPrologue = ctorProloguePrev; 987 } 988 } 989 990 public void visitMethodDef(JCMethodDecl tree) { 991 MethodSymbol m = tree.sym; 992 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 993 994 Lint lint = env.info.lint.augment(m); 995 Lint prevLint = chk.setLint(lint); 996 boolean ctorProloguePrev = env.info.ctorPrologue; 997 env.info.ctorPrologue = false; 998 MethodSymbol prevMethod = chk.setMethod(m); 999 try { 1000 deferredLintHandler.flush(tree.pos()); 1001 chk.checkDeprecatedAnnotation(tree.pos(), m); 1002 1003 1004 // Create a new environment with local scope 1005 // for attributing the method. 1006 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 1007 localEnv.info.lint = lint; 1008 1009 attribStats(tree.typarams, localEnv); 1010 1011 // If we override any other methods, check that we do so properly. 1012 // JLS ??? 1013 if (m.isStatic()) { 1014 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 1015 } else { 1016 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 1017 } 1018 chk.checkOverride(env, tree, m); 1019 1020 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 1021 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location())); 1022 } 1023 1024 // Enter all type parameters into the local method scope. 1025 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 1026 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 1027 1028 ClassSymbol owner = env.enclClass.sym; 1029 if ((owner.flags() & ANNOTATION) != 0 && 1030 (tree.params.nonEmpty() || 1031 tree.recvparam != null)) 1032 log.error(tree.params.nonEmpty() ? 1033 tree.params.head.pos() : 1034 tree.recvparam.pos(), 1035 Errors.IntfAnnotationMembersCantHaveParams); 1036 1037 // Attribute all value parameters. 1038 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 1039 attribStat(l.head, localEnv); 1040 } 1041 1042 chk.checkVarargsMethodDecl(localEnv, tree); 1043 1044 // Check that type parameters are well-formed. 1045 chk.validate(tree.typarams, localEnv); 1046 1047 // Check that result type is well-formed. 1048 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 1049 chk.validate(tree.restype, localEnv); 1050 1051 // Check that receiver type is well-formed. 1052 if (tree.recvparam != null) { 1053 // Use a new environment to check the receiver parameter. 1054 // Otherwise I get "might not have been initialized" errors. 1055 // Is there a better way? 1056 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1057 attribType(tree.recvparam, newEnv); 1058 chk.validate(tree.recvparam, newEnv); 1059 } 1060 1061 // Is this method a constructor? 1062 boolean isConstructor = TreeInfo.isConstructor(tree); 1063 1064 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP) { 1065 // lets find if this method is an accessor 1066 Optional<? extends RecordComponent> recordComponent = env.enclClass.sym.getRecordComponents().stream() 1067 .filter(rc -> rc.accessor == tree.sym && (rc.accessor.flags_field & GENERATED_MEMBER) == 0).findFirst(); 1068 if (recordComponent.isPresent()) { 1069 // the method is a user defined accessor lets check that everything is fine 1070 if (!tree.sym.isPublic()) { 1071 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.MethodMustBePublic)); 1072 } 1073 if (!types.isSameType(tree.sym.type.getReturnType(), recordComponent.get().type)) { 1074 log.error(tree, Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, 1075 Fragments.AccessorReturnTypeDoesntMatch(tree.sym, recordComponent.get()))); 1076 } 1077 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) { 1078 log.error(tree, 1079 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodCantThrowException)); 1080 } 1081 if (!tree.typarams.isEmpty()) { 1082 log.error(tree, 1083 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeGeneric)); 1084 } 1085 if (tree.sym.isStatic()) { 1086 log.error(tree, 1087 Errors.InvalidAccessorMethodInRecord(env.enclClass.sym, Fragments.AccessorMethodMustNotBeStatic)); 1088 } 1089 } 1090 1091 if (isConstructor) { 1092 // if this a constructor other than the canonical one 1093 if ((tree.sym.flags_field & RECORD) == 0) { 1094 if (!TreeInfo.hasConstructorCall(tree, names._this)) { 1095 log.error(tree, Errors.NonCanonicalConstructorInvokeAnotherConstructor(env.enclClass.sym)); 1096 } 1097 } else { 1098 // but if it is the canonical: 1099 1100 /* if user generated, then it shouldn't: 1101 * - have an accessibility stricter than that of the record type 1102 * - explicitly invoke any other constructor 1103 */ 1104 if ((tree.sym.flags_field & GENERATEDCONSTR) == 0) { 1105 if (Check.protection(m.flags()) > Check.protection(env.enclClass.sym.flags())) { 1106 log.error(tree, 1107 (env.enclClass.sym.flags() & AccessFlags) == 0 ? 1108 Errors.InvalidCanonicalConstructorInRecord( 1109 Fragments.Canonical, 1110 env.enclClass.sym.name, 1111 Fragments.CanonicalMustNotHaveStrongerAccess("package") 1112 ) : 1113 Errors.InvalidCanonicalConstructorInRecord( 1114 Fragments.Canonical, 1115 env.enclClass.sym.name, 1116 Fragments.CanonicalMustNotHaveStrongerAccess(asFlagSet(env.enclClass.sym.flags() & AccessFlags)) 1117 ) 1118 ); 1119 } 1120 1121 if (TreeInfo.hasAnyConstructorCall(tree)) { 1122 log.error(tree, Errors.InvalidCanonicalConstructorInRecord( 1123 Fragments.Canonical, env.enclClass.sym.name, 1124 Fragments.CanonicalMustNotContainExplicitConstructorInvocation)); 1125 } 1126 } 1127 1128 // also we want to check that no type variables have been defined 1129 if (!tree.typarams.isEmpty()) { 1130 log.error(tree, Errors.InvalidCanonicalConstructorInRecord( 1131 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalMustNotDeclareTypeVariables)); 1132 } 1133 1134 /* and now we need to check that the constructor's arguments are exactly the same as those of the 1135 * record components 1136 */ 1137 List<? extends RecordComponent> recordComponents = env.enclClass.sym.getRecordComponents(); 1138 List<Type> recordFieldTypes = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.type); 1139 for (JCVariableDecl param: tree.params) { 1140 boolean paramIsVarArgs = (param.sym.flags_field & VARARGS) != 0; 1141 if (!types.isSameType(param.type, recordFieldTypes.head) || 1142 (recordComponents.head.isVarargs() != paramIsVarArgs)) { 1143 log.error(param, Errors.InvalidCanonicalConstructorInRecord( 1144 Fragments.Canonical, env.enclClass.sym.name, 1145 Fragments.TypeMustBeIdenticalToCorrespondingRecordComponentType)); 1146 } 1147 recordComponents = recordComponents.tail; 1148 recordFieldTypes = recordFieldTypes.tail; 1149 } 1150 } 1151 } 1152 } 1153 1154 // annotation method checks 1155 if ((owner.flags() & ANNOTATION) != 0) { 1156 // annotation method cannot have throws clause 1157 if (tree.thrown.nonEmpty()) { 1158 log.error(tree.thrown.head.pos(), 1159 Errors.ThrowsNotAllowedInIntfAnnotation); 1160 } 1161 // annotation method cannot declare type-parameters 1162 if (tree.typarams.nonEmpty()) { 1163 log.error(tree.typarams.head.pos(), 1164 Errors.IntfAnnotationMembersCantHaveTypeParams); 1165 } 1166 // validate annotation method's return type (could be an annotation type) 1167 chk.validateAnnotationType(tree.restype); 1168 // ensure that annotation method does not clash with members of Object/Annotation 1169 chk.validateAnnotationMethod(tree.pos(), m); 1170 } 1171 1172 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1173 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1174 1175 if (tree.body == null) { 1176 // Empty bodies are only allowed for 1177 // abstract, native, or interface methods, or for methods 1178 // in a retrofit signature class. 1179 if (tree.defaultValue != null) { 1180 if ((owner.flags() & ANNOTATION) == 0) 1181 log.error(tree.pos(), 1182 Errors.DefaultAllowedInIntfAnnotationMember); 1183 } 1184 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1185 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract); 1186 } else { 1187 if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1188 if ((owner.flags() & INTERFACE) != 0) { 1189 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody); 1190 } else { 1191 log.error(tree.pos(), Errors.AbstractMethCantHaveBody); 1192 } 1193 } else if ((tree.mods.flags & NATIVE) != 0) { 1194 log.error(tree.pos(), Errors.NativeMethCantHaveBody); 1195 } 1196 // Add an implicit super() call unless an explicit call to 1197 // super(...) or this(...) is given 1198 // or we are compiling class java.lang.Object. 1199 if (isConstructor && owner.type != syms.objectType) { 1200 if (!TreeInfo.hasAnyConstructorCall(tree)) { 1201 JCStatement supCall = make.at(tree.body.pos).Exec(make.Apply(List.nil(), 1202 make.Ident(names._super), make.Idents(List.nil()))); 1203 if (owner.isValueClass()) { 1204 tree.body.stats = tree.body.stats.append(supCall); 1205 } else { 1206 tree.body.stats = tree.body.stats.prepend(supCall); 1207 } 1208 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1209 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1210 TreeInfo.hasConstructorCall(tree, names._super)) { 1211 // enum constructors are not allowed to call super 1212 // directly, so make sure there aren't any super calls 1213 // in enum constructors, except in the compiler 1214 // generated one. 1215 log.error(tree.body.stats.head.pos(), 1216 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym)); 1217 } 1218 if (env.enclClass.sym.isRecord() && (tree.sym.flags_field & RECORD) != 0) { // we are seeing the canonical constructor 1219 List<Name> recordComponentNames = TreeInfo.recordFields(env.enclClass).map(vd -> vd.sym.name); 1220 List<Name> initParamNames = tree.sym.params.map(p -> p.name); 1221 if (!initParamNames.equals(recordComponentNames)) { 1222 log.error(tree, Errors.InvalidCanonicalConstructorInRecord( 1223 Fragments.Canonical, env.enclClass.sym.name, Fragments.CanonicalWithNameMismatch)); 1224 } 1225 if (tree.sym.type.asMethodType().thrown != null && !tree.sym.type.asMethodType().thrown.isEmpty()) { 1226 log.error(tree, 1227 Errors.InvalidCanonicalConstructorInRecord( 1228 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical, 1229 env.enclClass.sym.name, 1230 Fragments.ThrowsClauseNotAllowedForCanonicalConstructor( 1231 TreeInfo.isCompactConstructor(tree) ? Fragments.Compact : Fragments.Canonical))); 1232 } 1233 } 1234 } 1235 1236 // Attribute all type annotations in the body 1237 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1238 annotate.flush(); 1239 1240 // Start of constructor prologue 1241 localEnv.info.ctorPrologue = isConstructor; 1242 1243 // Attribute method body. 1244 attribStat(tree.body, localEnv); 1245 } 1246 1247 localEnv.info.scope.leave(); 1248 result = tree.type = m.type; 1249 } finally { 1250 chk.setLint(prevLint); 1251 chk.setMethod(prevMethod); 1252 env.info.ctorPrologue = ctorProloguePrev; 1253 } 1254 } 1255 1256 public void visitVarDef(JCVariableDecl tree) { 1257 // Local variables have not been entered yet, so we need to do it now: 1258 if (env.info.scope.owner.kind == MTH || env.info.scope.owner.kind == VAR) { 1259 if (tree.sym != null) { 1260 // parameters have already been entered 1261 env.info.scope.enter(tree.sym); 1262 } else { 1263 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) { 1264 if (tree.init == null) { 1265 //cannot use 'var' without initializer 1266 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit)); 1267 tree.vartype = make.Erroneous(); 1268 } else { 1269 Fragment msg = canInferLocalVarType(tree); 1270 if (msg != null) { 1271 //cannot use 'var' with initializer which require an explicit target 1272 //(e.g. lambda, method reference, array initializer). 1273 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg)); 1274 tree.vartype = make.Erroneous(); 1275 } 1276 } 1277 } 1278 try { 1279 annotate.blockAnnotations(); 1280 memberEnter.memberEnter(tree, env); 1281 } finally { 1282 annotate.unblockAnnotations(); 1283 } 1284 } 1285 } else { 1286 if (tree.init != null) { 1287 // Field initializer expression need to be entered. 1288 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1289 annotate.flush(); 1290 } 1291 } 1292 1293 VarSymbol v = tree.sym; 1294 Lint lint = env.info.lint.augment(v); 1295 Lint prevLint = chk.setLint(lint); 1296 1297 // Check that the variable's declared type is well-formed. 1298 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1299 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1300 (tree.sym.flags() & PARAMETER) != 0; 1301 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped()); 1302 1303 try { 1304 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1305 deferredLintHandler.flush(tree.pos()); 1306 chk.checkDeprecatedAnnotation(tree.pos(), v); 1307 1308 if (tree.init != null) { 1309 if ((v.flags_field & FINAL) == 0 || 1310 !memberEnter.needsLazyConstValue(tree.init)) { 1311 // Not a compile-time constant 1312 // Attribute initializer in a new environment 1313 // with the declared variable as owner. 1314 // Check that initializer conforms to variable's declared type. 1315 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1316 initEnv.info.lint = lint; 1317 // In order to catch self-references, we set the variable's 1318 // declaration position to maximal possible value, effectively 1319 // marking the variable as undefined. 1320 initEnv.info.enclVar = v; 1321 boolean previousCtorPrologue = initEnv.info.ctorPrologue; 1322 try { 1323 if (v.owner.kind == TYP && v.owner.isValueClass() && !v.isStatic()) { 1324 // strict instance initializer in a value class 1325 initEnv.info.ctorPrologue = true; 1326 } 1327 attribExpr(tree.init, initEnv, v.type); 1328 if (tree.isImplicitlyTyped()) { 1329 //fixup local variable type 1330 v.type = chk.checkLocalVarType(tree, tree.init.type, tree.name); 1331 } 1332 } finally { 1333 initEnv.info.ctorPrologue = previousCtorPrologue; 1334 } 1335 } 1336 if (tree.isImplicitlyTyped()) { 1337 setSyntheticVariableType(tree, v.type); 1338 } 1339 } 1340 result = tree.type = v.type; 1341 if (env.enclClass.sym.isRecord() && tree.sym.owner.kind == TYP && !v.isStatic()) { 1342 if (isNonArgsMethodInObject(v.name)) { 1343 log.error(tree, Errors.IllegalRecordComponentName(v)); 1344 } 1345 } 1346 } 1347 finally { 1348 chk.setLint(prevLint); 1349 } 1350 } 1351 1352 private boolean isNonArgsMethodInObject(Name name) { 1353 for (Symbol s : syms.objectType.tsym.members().getSymbolsByName(name, s -> s.kind == MTH)) { 1354 if (s.type.getParameterTypes().isEmpty()) { 1355 return true; 1356 } 1357 } 1358 return false; 1359 } 1360 1361 Fragment canInferLocalVarType(JCVariableDecl tree) { 1362 LocalInitScanner lis = new LocalInitScanner(); 1363 lis.scan(tree.init); 1364 return lis.badInferenceMsg; 1365 } 1366 1367 static class LocalInitScanner extends TreeScanner { 1368 Fragment badInferenceMsg = null; 1369 boolean needsTarget = true; 1370 1371 @Override 1372 public void visitNewArray(JCNewArray tree) { 1373 if (tree.elemtype == null && needsTarget) { 1374 badInferenceMsg = Fragments.LocalArrayMissingTarget; 1375 } 1376 } 1377 1378 @Override 1379 public void visitLambda(JCLambda tree) { 1380 if (needsTarget) { 1381 badInferenceMsg = Fragments.LocalLambdaMissingTarget; 1382 } 1383 } 1384 1385 @Override 1386 public void visitTypeCast(JCTypeCast tree) { 1387 boolean prevNeedsTarget = needsTarget; 1388 try { 1389 needsTarget = false; 1390 super.visitTypeCast(tree); 1391 } finally { 1392 needsTarget = prevNeedsTarget; 1393 } 1394 } 1395 1396 @Override 1397 public void visitReference(JCMemberReference tree) { 1398 if (needsTarget) { 1399 badInferenceMsg = Fragments.LocalMrefMissingTarget; 1400 } 1401 } 1402 1403 @Override 1404 public void visitNewClass(JCNewClass tree) { 1405 boolean prevNeedsTarget = needsTarget; 1406 try { 1407 needsTarget = false; 1408 super.visitNewClass(tree); 1409 } finally { 1410 needsTarget = prevNeedsTarget; 1411 } 1412 } 1413 1414 @Override 1415 public void visitApply(JCMethodInvocation tree) { 1416 boolean prevNeedsTarget = needsTarget; 1417 try { 1418 needsTarget = false; 1419 super.visitApply(tree); 1420 } finally { 1421 needsTarget = prevNeedsTarget; 1422 } 1423 } 1424 } 1425 1426 public void visitSkip(JCSkip tree) { 1427 result = null; 1428 } 1429 1430 public void visitBlock(JCBlock tree) { 1431 if (env.info.scope.owner.kind == TYP || env.info.scope.owner.kind == ERR) { 1432 // Block is a static or instance initializer; 1433 // let the owner of the environment be a freshly 1434 // created BLOCK-method. 1435 Symbol fakeOwner = 1436 new MethodSymbol(tree.flags | BLOCK | 1437 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1438 env.info.scope.owner); 1439 final Env<AttrContext> localEnv = 1440 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1441 1442 if ((tree.flags & STATIC) != 0) { 1443 localEnv.info.staticLevel++; 1444 } else { 1445 localEnv.info.instanceInitializerBlock = true; 1446 } 1447 // Attribute all type annotations in the block 1448 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1449 annotate.flush(); 1450 attribStats(tree.stats, localEnv); 1451 1452 { 1453 // Store init and clinit type annotations with the ClassSymbol 1454 // to allow output in Gen.normalizeDefs. 1455 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1456 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1457 if ((tree.flags & STATIC) != 0) { 1458 cs.appendClassInitTypeAttributes(tas); 1459 } else { 1460 cs.appendInitTypeAttributes(tas); 1461 } 1462 } 1463 } else { 1464 // Create a new local environment with a local scope. 1465 Env<AttrContext> localEnv = 1466 env.dup(tree, env.info.dup(env.info.scope.dup())); 1467 try { 1468 attribStats(tree.stats, localEnv); 1469 } finally { 1470 localEnv.info.scope.leave(); 1471 } 1472 } 1473 result = null; 1474 } 1475 1476 public void visitDoLoop(JCDoWhileLoop tree) { 1477 attribStat(tree.body, env.dup(tree)); 1478 attribExpr(tree.cond, env, syms.booleanType); 1479 handleLoopConditionBindings(matchBindings, tree, tree.body); 1480 result = null; 1481 } 1482 1483 public void visitWhileLoop(JCWhileLoop tree) { 1484 attribExpr(tree.cond, env, syms.booleanType); 1485 MatchBindings condBindings = matchBindings; 1486 // include condition's bindings when true in the body: 1487 Env<AttrContext> whileEnv = bindingEnv(env, condBindings.bindingsWhenTrue); 1488 try { 1489 attribStat(tree.body, whileEnv.dup(tree)); 1490 } finally { 1491 whileEnv.info.scope.leave(); 1492 } 1493 handleLoopConditionBindings(condBindings, tree, tree.body); 1494 result = null; 1495 } 1496 1497 public void visitForLoop(JCForLoop tree) { 1498 Env<AttrContext> loopEnv = 1499 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1500 MatchBindings condBindings = MatchBindingsComputer.EMPTY; 1501 try { 1502 attribStats(tree.init, loopEnv); 1503 if (tree.cond != null) { 1504 attribExpr(tree.cond, loopEnv, syms.booleanType); 1505 // include condition's bindings when true in the body and step: 1506 condBindings = matchBindings; 1507 } 1508 Env<AttrContext> bodyEnv = bindingEnv(loopEnv, condBindings.bindingsWhenTrue); 1509 try { 1510 bodyEnv.tree = tree; // before, we were not in loop! 1511 attribStats(tree.step, bodyEnv); 1512 attribStat(tree.body, bodyEnv); 1513 } finally { 1514 bodyEnv.info.scope.leave(); 1515 } 1516 result = null; 1517 } 1518 finally { 1519 loopEnv.info.scope.leave(); 1520 } 1521 handleLoopConditionBindings(condBindings, tree, tree.body); 1522 } 1523 1524 /** 1525 * Include condition's bindings when false after the loop, if cannot get out of the loop 1526 */ 1527 private void handleLoopConditionBindings(MatchBindings condBindings, 1528 JCStatement loop, 1529 JCStatement loopBody) { 1530 if (condBindings.bindingsWhenFalse.nonEmpty() && 1531 !breaksTo(env, loop, loopBody)) { 1532 addBindings2Scope(loop, condBindings.bindingsWhenFalse); 1533 } 1534 } 1535 1536 private boolean breaksTo(Env<AttrContext> env, JCTree loop, JCTree body) { 1537 preFlow(body); 1538 return flow.breaksToTree(env, loop, body, make); 1539 } 1540 1541 /** 1542 * Add given bindings to the current scope, unless there's a break to 1543 * an immediately enclosing labeled statement. 1544 */ 1545 private void addBindings2Scope(JCStatement introducingStatement, 1546 List<BindingSymbol> bindings) { 1547 if (bindings.isEmpty()) { 1548 return ; 1549 } 1550 1551 var searchEnv = env; 1552 while (searchEnv.tree instanceof JCLabeledStatement labeled && 1553 labeled.body == introducingStatement) { 1554 if (breaksTo(env, labeled, labeled.body)) { 1555 //breaking to an immediately enclosing labeled statement 1556 return ; 1557 } 1558 searchEnv = searchEnv.next; 1559 introducingStatement = labeled; 1560 } 1561 1562 //include condition's body when false after the while, if cannot get out of the loop 1563 bindings.forEach(env.info.scope::enter); 1564 bindings.forEach(BindingSymbol::preserveBinding); 1565 } 1566 1567 public void visitForeachLoop(JCEnhancedForLoop tree) { 1568 Env<AttrContext> loopEnv = 1569 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1570 try { 1571 //the Formal Parameter of a for-each loop is not in the scope when 1572 //attributing the for-each expression; we mimic this by attributing 1573 //the for-each expression first (against original scope). 1574 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1575 chk.checkNonVoid(tree.pos(), exprType); 1576 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1577 if (elemtype == null) { 1578 // or perhaps expr implements Iterable<T>? 1579 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1580 if (base == null) { 1581 log.error(tree.expr.pos(), 1582 Errors.ForeachNotApplicableToType(exprType, 1583 Fragments.TypeReqArrayOrIterable)); 1584 elemtype = types.createErrorType(exprType); 1585 } else { 1586 List<Type> iterableParams = base.allparams(); 1587 elemtype = iterableParams.isEmpty() 1588 ? syms.objectType 1589 : types.wildUpperBound(iterableParams.head); 1590 1591 // Check the return type of the method iterator(). 1592 // This is the bare minimum we need to verify to make sure code generation doesn't crash. 1593 Symbol iterSymbol = rs.resolveInternalMethod(tree.pos(), 1594 loopEnv, types.skipTypeVars(exprType, false), names.iterator, List.nil(), List.nil()); 1595 if (types.asSuper(iterSymbol.type.getReturnType(), syms.iteratorType.tsym) == null) { 1596 log.error(tree.pos(), 1597 Errors.ForeachNotApplicableToType(exprType, Fragments.TypeReqArrayOrIterable)); 1598 } 1599 } 1600 } 1601 if (tree.var.isImplicitlyTyped()) { 1602 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name); 1603 setSyntheticVariableType(tree.var, inferredType); 1604 } 1605 attribStat(tree.var, loopEnv); 1606 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1607 loopEnv.tree = tree; // before, we were not in loop! 1608 attribStat(tree.body, loopEnv); 1609 result = null; 1610 } 1611 finally { 1612 loopEnv.info.scope.leave(); 1613 } 1614 } 1615 1616 public void visitLabelled(JCLabeledStatement tree) { 1617 // Check that label is not used in an enclosing statement 1618 Env<AttrContext> env1 = env; 1619 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1620 if (env1.tree.hasTag(LABELLED) && 1621 ((JCLabeledStatement) env1.tree).label == tree.label) { 1622 log.error(tree.pos(), 1623 Errors.LabelAlreadyInUse(tree.label)); 1624 break; 1625 } 1626 env1 = env1.next; 1627 } 1628 1629 attribStat(tree.body, env.dup(tree)); 1630 result = null; 1631 } 1632 1633 public void visitSwitch(JCSwitch tree) { 1634 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> { 1635 attribStats(c.stats, caseEnv); 1636 }); 1637 result = null; 1638 } 1639 1640 public void visitSwitchExpression(JCSwitchExpression tree) { 1641 boolean wrongContext = false; 1642 1643 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly) ? 1644 PolyKind.STANDALONE : PolyKind.POLY; 1645 1646 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1647 //this means we are returning a poly conditional from void-compatible lambda expression 1648 resultInfo.checkContext.report(tree, diags.fragment(Fragments.SwitchExpressionTargetCantBeVoid)); 1649 resultInfo = recoveryInfo; 1650 wrongContext = true; 1651 } 1652 1653 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1654 unknownExprInfo : 1655 resultInfo.dup(switchExpressionContext(resultInfo.checkContext)); 1656 1657 ListBuffer<DiagnosticPosition> caseTypePositions = new ListBuffer<>(); 1658 ListBuffer<Type> caseTypes = new ListBuffer<>(); 1659 1660 handleSwitch(tree, tree.selector, tree.cases, (c, caseEnv) -> { 1661 caseEnv.info.yieldResult = condInfo; 1662 attribStats(c.stats, caseEnv); 1663 new TreeScanner() { 1664 @Override 1665 public void visitYield(JCYield brk) { 1666 if (brk.target == tree) { 1667 caseTypePositions.append(brk.value != null ? brk.value.pos() : brk.pos()); 1668 caseTypes.append(brk.value != null ? brk.value.type : syms.errType); 1669 } 1670 super.visitYield(brk); 1671 } 1672 1673 @Override public void visitClassDef(JCClassDecl tree) {} 1674 @Override public void visitLambda(JCLambda tree) {} 1675 }.scan(c.stats); 1676 }); 1677 1678 if (tree.cases.isEmpty()) { 1679 log.error(tree.pos(), 1680 Errors.SwitchExpressionEmpty); 1681 } else if (caseTypes.isEmpty()) { 1682 log.error(tree.pos(), 1683 Errors.SwitchExpressionNoResultExpressions); 1684 } 1685 1686 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(caseTypePositions.toList(), caseTypes.toList()) : pt(); 1687 1688 result = tree.type = wrongContext? types.createErrorType(pt()) : check(tree, owntype, KindSelector.VAL, resultInfo); 1689 } 1690 //where: 1691 CheckContext switchExpressionContext(CheckContext checkContext) { 1692 return new Check.NestedCheckContext(checkContext) { 1693 //this will use enclosing check context to check compatibility of 1694 //subexpression against target type; if we are in a method check context, 1695 //depending on whether boxing is allowed, we could have incompatibilities 1696 @Override 1697 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1698 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInSwitchExpression(details))); 1699 } 1700 }; 1701 } 1702 1703 private void handleSwitch(JCTree switchTree, 1704 JCExpression selector, 1705 List<JCCase> cases, 1706 BiConsumer<JCCase, Env<AttrContext>> attribCase) { 1707 Type seltype = attribExpr(selector, env); 1708 1709 Env<AttrContext> switchEnv = 1710 env.dup(switchTree, env.info.dup(env.info.scope.dup())); 1711 1712 try { 1713 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1714 boolean stringSwitch = types.isSameType(seltype, syms.stringType); 1715 boolean booleanSwitch = types.isSameType(types.unboxedTypeOrType(seltype), syms.booleanType); 1716 boolean errorEnumSwitch = TreeInfo.isErrorEnumSwitch(selector, cases); 1717 boolean intSwitch = types.isAssignable(seltype, syms.intType); 1718 boolean patternSwitch; 1719 if (seltype.isPrimitive() && !intSwitch) { 1720 preview.checkSourceLevel(selector.pos(), Feature.PRIMITIVE_PATTERNS); 1721 patternSwitch = true; 1722 } 1723 if (!enumSwitch && !stringSwitch && !errorEnumSwitch && 1724 !intSwitch) { 1725 preview.checkSourceLevel(selector.pos(), Feature.PATTERN_SWITCH); 1726 patternSwitch = true; 1727 } else { 1728 patternSwitch = cases.stream() 1729 .flatMap(c -> c.labels.stream()) 1730 .anyMatch(l -> l.hasTag(PATTERNCASELABEL) || 1731 TreeInfo.isNullCaseLabel(l)); 1732 } 1733 1734 // Attribute all cases and 1735 // check that there are no duplicate case labels or default clauses. 1736 Set<Object> constants = new HashSet<>(); // The set of case constants. 1737 boolean hasDefault = false; // Is there a default label? 1738 boolean hasUnconditionalPattern = false; // Is there a unconditional pattern? 1739 boolean lastPatternErroneous = false; // Has the last pattern erroneous type? 1740 boolean hasNullPattern = false; // Is there a null pattern? 1741 CaseTree.CaseKind caseKind = null; 1742 boolean wasError = false; 1743 JCCaseLabel unconditionalCaseLabel = null; 1744 for (List<JCCase> l = cases; l.nonEmpty(); l = l.tail) { 1745 JCCase c = l.head; 1746 if (caseKind == null) { 1747 caseKind = c.caseKind; 1748 } else if (caseKind != c.caseKind && !wasError) { 1749 log.error(c.pos(), 1750 Errors.SwitchMixingCaseTypes); 1751 wasError = true; 1752 } 1753 MatchBindings currentBindings = null; 1754 MatchBindings guardBindings = null; 1755 for (List<JCCaseLabel> labels = c.labels; labels.nonEmpty(); labels = labels.tail) { 1756 JCCaseLabel label = labels.head; 1757 if (label instanceof JCConstantCaseLabel constLabel) { 1758 JCExpression expr = constLabel.expr; 1759 if (TreeInfo.isNull(expr)) { 1760 preview.checkSourceLevel(expr.pos(), Feature.CASE_NULL); 1761 if (hasNullPattern) { 1762 log.error(label.pos(), Errors.DuplicateCaseLabel); 1763 } 1764 hasNullPattern = true; 1765 attribExpr(expr, switchEnv, seltype); 1766 matchBindings = new MatchBindings(matchBindings.bindingsWhenTrue, matchBindings.bindingsWhenFalse, true); 1767 } else if (enumSwitch) { 1768 Symbol sym = enumConstant(expr, seltype); 1769 if (sym == null) { 1770 if (allowPatternSwitch) { 1771 attribTree(expr, switchEnv, caseLabelResultInfo(seltype)); 1772 Symbol enumSym = TreeInfo.symbol(expr); 1773 if (enumSym == null || !enumSym.isEnum() || enumSym.kind != VAR) { 1774 log.error(expr.pos(), Errors.EnumLabelMustBeEnumConstant); 1775 } else if (!constants.add(enumSym)) { 1776 log.error(label.pos(), Errors.DuplicateCaseLabel); 1777 } 1778 } else { 1779 log.error(expr.pos(), Errors.EnumLabelMustBeUnqualifiedEnum); 1780 } 1781 } else if (!constants.add(sym)) { 1782 log.error(label.pos(), Errors.DuplicateCaseLabel); 1783 } 1784 } else if (errorEnumSwitch) { 1785 //error recovery: the selector is erroneous, and all the case labels 1786 //are identifiers. This could be an enum switch - don't report resolve 1787 //error for the case label: 1788 var prevResolveHelper = rs.basicLogResolveHelper; 1789 try { 1790 rs.basicLogResolveHelper = rs.silentLogResolveHelper; 1791 attribExpr(expr, switchEnv, seltype); 1792 } finally { 1793 rs.basicLogResolveHelper = prevResolveHelper; 1794 } 1795 } else { 1796 Type pattype = attribTree(expr, switchEnv, caseLabelResultInfo(seltype)); 1797 if (!pattype.hasTag(ERROR)) { 1798 if (pattype.constValue() == null) { 1799 Symbol s = TreeInfo.symbol(expr); 1800 if (s != null && s.kind == TYP) { 1801 log.error(expr.pos(), 1802 Errors.PatternExpected); 1803 } else if (s == null || !s.isEnum()) { 1804 log.error(expr.pos(), 1805 (stringSwitch ? Errors.StringConstReq 1806 : intSwitch ? Errors.ConstExprReq 1807 : Errors.PatternOrEnumReq)); 1808 } else if (!constants.add(s)) { 1809 log.error(label.pos(), Errors.DuplicateCaseLabel); 1810 } 1811 } 1812 else { 1813 if (!stringSwitch && !intSwitch && 1814 !((pattype.getTag().isInSuperClassesOf(LONG) || pattype.getTag().equals(BOOLEAN)) && 1815 types.isSameType(types.unboxedTypeOrType(seltype), pattype))) { 1816 log.error(label.pos(), Errors.ConstantLabelNotCompatible(pattype, seltype)); 1817 } else if (!constants.add(pattype.constValue())) { 1818 log.error(c.pos(), Errors.DuplicateCaseLabel); 1819 } 1820 } 1821 } 1822 } 1823 } else if (label instanceof JCDefaultCaseLabel def) { 1824 if (hasDefault) { 1825 log.error(label.pos(), Errors.DuplicateDefaultLabel); 1826 } else if (hasUnconditionalPattern) { 1827 log.error(label.pos(), Errors.UnconditionalPatternAndDefault); 1828 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) { 1829 log.error(label.pos(), Errors.DefaultAndBothBooleanValues); 1830 } 1831 hasDefault = true; 1832 matchBindings = MatchBindingsComputer.EMPTY; 1833 } else if (label instanceof JCPatternCaseLabel patternlabel) { 1834 //pattern 1835 JCPattern pat = patternlabel.pat; 1836 attribExpr(pat, switchEnv, seltype); 1837 Type primaryType = TreeInfo.primaryPatternType(pat); 1838 1839 if (primaryType.isPrimitive()) { 1840 preview.checkSourceLevel(pat.pos(), Feature.PRIMITIVE_PATTERNS); 1841 } else if (!primaryType.hasTag(TYPEVAR)) { 1842 primaryType = chk.checkClassOrArrayType(pat.pos(), primaryType); 1843 } 1844 checkCastablePattern(pat.pos(), seltype, primaryType); 1845 Type patternType = types.erasure(primaryType); 1846 JCExpression guard = c.guard; 1847 if (guardBindings == null && guard != null) { 1848 MatchBindings afterPattern = matchBindings; 1849 Env<AttrContext> bodyEnv = bindingEnv(switchEnv, matchBindings.bindingsWhenTrue); 1850 try { 1851 attribExpr(guard, bodyEnv, syms.booleanType); 1852 } finally { 1853 bodyEnv.info.scope.leave(); 1854 } 1855 1856 guardBindings = matchBindings; 1857 matchBindings = afterPattern; 1858 1859 if (TreeInfo.isBooleanWithValue(guard, 0)) { 1860 log.error(guard.pos(), Errors.GuardHasConstantExpressionFalse); 1861 } 1862 } 1863 boolean unguarded = TreeInfo.unguardedCase(c) && !pat.hasTag(RECORDPATTERN); 1864 boolean unconditional = 1865 unguarded && 1866 !patternType.isErroneous() && 1867 types.isUnconditionallyExact(seltype, patternType); 1868 if (unconditional) { 1869 if (hasUnconditionalPattern) { 1870 log.error(pat.pos(), Errors.DuplicateUnconditionalPattern); 1871 } else if (hasDefault) { 1872 log.error(pat.pos(), Errors.UnconditionalPatternAndDefault); 1873 } else if (booleanSwitch && constants.containsAll(Set.of(0, 1))) { 1874 log.error(pat.pos(), Errors.UnconditionalPatternAndBothBooleanValues); 1875 } 1876 hasUnconditionalPattern = true; 1877 unconditionalCaseLabel = label; 1878 } 1879 lastPatternErroneous = patternType.isErroneous(); 1880 } else { 1881 Assert.error(); 1882 } 1883 currentBindings = matchBindingsComputer.switchCase(label, currentBindings, matchBindings); 1884 } 1885 1886 if (guardBindings != null) { 1887 currentBindings = matchBindingsComputer.caseGuard(c, currentBindings, guardBindings); 1888 } 1889 1890 Env<AttrContext> caseEnv = 1891 bindingEnv(switchEnv, c, currentBindings.bindingsWhenTrue); 1892 try { 1893 attribCase.accept(c, caseEnv); 1894 } finally { 1895 caseEnv.info.scope.leave(); 1896 } 1897 addVars(c.stats, switchEnv.info.scope); 1898 1899 preFlow(c); 1900 c.completesNormally = flow.aliveAfter(caseEnv, c, make); 1901 } 1902 if (patternSwitch) { 1903 chk.checkSwitchCaseStructure(cases); 1904 chk.checkSwitchCaseLabelDominated(unconditionalCaseLabel, cases); 1905 } 1906 if (switchTree.hasTag(SWITCH)) { 1907 ((JCSwitch) switchTree).hasUnconditionalPattern = 1908 hasDefault || hasUnconditionalPattern || lastPatternErroneous; 1909 ((JCSwitch) switchTree).patternSwitch = patternSwitch; 1910 } else if (switchTree.hasTag(SWITCH_EXPRESSION)) { 1911 ((JCSwitchExpression) switchTree).hasUnconditionalPattern = 1912 hasDefault || hasUnconditionalPattern || lastPatternErroneous; 1913 ((JCSwitchExpression) switchTree).patternSwitch = patternSwitch; 1914 } else { 1915 Assert.error(switchTree.getTag().name()); 1916 } 1917 } finally { 1918 switchEnv.info.scope.leave(); 1919 } 1920 } 1921 // where 1922 private ResultInfo caseLabelResultInfo(Type seltype) { 1923 return new ResultInfo(KindSelector.VAL_TYP, 1924 !seltype.hasTag(ERROR) ? seltype 1925 : Type.noType); 1926 } 1927 /** Add any variables defined in stats to the switch scope. */ 1928 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1929 for (;stats.nonEmpty(); stats = stats.tail) { 1930 JCTree stat = stats.head; 1931 if (stat.hasTag(VARDEF)) 1932 switchScope.enter(((JCVariableDecl) stat).sym); 1933 } 1934 } 1935 // where 1936 /** Return the selected enumeration constant symbol, or null. */ 1937 private Symbol enumConstant(JCTree tree, Type enumType) { 1938 if (tree.hasTag(IDENT)) { 1939 JCIdent ident = (JCIdent)tree; 1940 Name name = ident.name; 1941 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1942 if (sym.kind == VAR) { 1943 Symbol s = ident.sym = sym; 1944 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1945 ident.type = s.type; 1946 return ((s.flags_field & Flags.ENUM) == 0) 1947 ? null : s; 1948 } 1949 } 1950 } 1951 return null; 1952 } 1953 1954 public void visitSynchronized(JCSynchronized tree) { 1955 boolean identityType = chk.checkIdentityType(tree.pos(), attribExpr(tree.lock, env)); 1956 if (env.info.lint.isEnabled(LintCategory.SYNCHRONIZATION) && 1957 identityType && 1958 isValueBased(tree.lock.type)) { 1959 log.warning(LintCategory.SYNCHRONIZATION, tree.pos(), Warnings.AttemptToSynchronizeOnInstanceOfValueBasedClass); 1960 } 1961 attribStat(tree.body, env); 1962 result = null; 1963 } 1964 // where 1965 private boolean isValueBased(Type t) { 1966 return t != null && t.tsym != null && (t.tsym.flags() & VALUE_BASED) != 0; 1967 } 1968 1969 public void visitTry(JCTry tree) { 1970 // Create a new local environment with a local 1971 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1972 try { 1973 boolean isTryWithResource = tree.resources.nonEmpty(); 1974 // Create a nested environment for attributing the try block if needed 1975 Env<AttrContext> tryEnv = isTryWithResource ? 1976 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1977 localEnv; 1978 try { 1979 // Attribute resource declarations 1980 for (JCTree resource : tree.resources) { 1981 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1982 @Override 1983 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1984 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details))); 1985 } 1986 }; 1987 ResultInfo twrResult = 1988 new ResultInfo(KindSelector.VAR, 1989 syms.autoCloseableType, 1990 twrContext); 1991 if (resource.hasTag(VARDEF)) { 1992 attribStat(resource, tryEnv); 1993 twrResult.check(resource, resource.type); 1994 1995 //check that resource type cannot throw InterruptedException 1996 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1997 1998 VarSymbol var = ((JCVariableDecl) resource).sym; 1999 2000 var.flags_field |= Flags.FINAL; 2001 var.setData(ElementKind.RESOURCE_VARIABLE); 2002 } else { 2003 attribTree(resource, tryEnv, twrResult); 2004 } 2005 } 2006 // Attribute body 2007 attribStat(tree.body, tryEnv); 2008 } finally { 2009 if (isTryWithResource) 2010 tryEnv.info.scope.leave(); 2011 } 2012 2013 // Attribute catch clauses 2014 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 2015 JCCatch c = l.head; 2016 Env<AttrContext> catchEnv = 2017 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 2018 try { 2019 Type ctype = attribStat(c.param, catchEnv); 2020 if (TreeInfo.isMultiCatch(c)) { 2021 //multi-catch parameter is implicitly marked as final 2022 c.param.sym.flags_field |= FINAL | UNION; 2023 } 2024 if (c.param.sym.kind == VAR) { 2025 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 2026 } 2027 chk.checkType(c.param.vartype.pos(), 2028 chk.checkClassType(c.param.vartype.pos(), ctype), 2029 syms.throwableType); 2030 attribStat(c.body, catchEnv); 2031 } finally { 2032 catchEnv.info.scope.leave(); 2033 } 2034 } 2035 2036 // Attribute finalizer 2037 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 2038 result = null; 2039 } 2040 finally { 2041 localEnv.info.scope.leave(); 2042 } 2043 } 2044 2045 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 2046 if (!resource.isErroneous() && 2047 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 2048 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 2049 Symbol close = syms.noSymbol; 2050 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 2051 try { 2052 close = rs.resolveQualifiedMethod(pos, 2053 env, 2054 types.skipTypeVars(resource, false), 2055 names.close, 2056 List.nil(), 2057 List.nil()); 2058 } 2059 finally { 2060 log.popDiagnosticHandler(discardHandler); 2061 } 2062 if (close.kind == MTH && 2063 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 2064 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 2065 env.info.lint.isEnabled(LintCategory.TRY)) { 2066 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource)); 2067 } 2068 } 2069 } 2070 2071 public void visitConditional(JCConditional tree) { 2072 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 2073 MatchBindings condBindings = matchBindings; 2074 2075 tree.polyKind = (pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 2076 isBooleanOrNumeric(env, tree)) ? 2077 PolyKind.STANDALONE : PolyKind.POLY; 2078 2079 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 2080 //this means we are returning a poly conditional from void-compatible lambda expression 2081 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid)); 2082 result = tree.type = types.createErrorType(resultInfo.pt); 2083 return; 2084 } 2085 2086 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 2087 unknownExprInfo : 2088 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 2089 2090 2091 // x ? y : z 2092 // include x's bindings when true in y 2093 // include x's bindings when false in z 2094 2095 Type truetype; 2096 Env<AttrContext> trueEnv = bindingEnv(env, condBindings.bindingsWhenTrue); 2097 try { 2098 truetype = attribTree(tree.truepart, trueEnv, condInfo); 2099 } finally { 2100 trueEnv.info.scope.leave(); 2101 } 2102 2103 MatchBindings trueBindings = matchBindings; 2104 2105 Type falsetype; 2106 Env<AttrContext> falseEnv = bindingEnv(env, condBindings.bindingsWhenFalse); 2107 try { 2108 falsetype = attribTree(tree.falsepart, falseEnv, condInfo); 2109 } finally { 2110 falseEnv.info.scope.leave(); 2111 } 2112 2113 MatchBindings falseBindings = matchBindings; 2114 2115 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? 2116 condType(List.of(tree.truepart.pos(), tree.falsepart.pos()), 2117 List.of(truetype, falsetype)) : pt(); 2118 if (condtype.constValue() != null && 2119 truetype.constValue() != null && 2120 falsetype.constValue() != null && 2121 !owntype.hasTag(NONE)) { 2122 //constant folding 2123 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 2124 } 2125 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2126 matchBindings = matchBindingsComputer.conditional(tree, condBindings, trueBindings, falseBindings); 2127 } 2128 //where 2129 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 2130 switch (tree.getTag()) { 2131 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 2132 ((JCLiteral)tree).typetag == BOOLEAN || 2133 ((JCLiteral)tree).typetag == BOT; 2134 case LAMBDA: case REFERENCE: return false; 2135 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 2136 case CONDEXPR: 2137 JCConditional condTree = (JCConditional)tree; 2138 return isBooleanOrNumeric(env, condTree.truepart) && 2139 isBooleanOrNumeric(env, condTree.falsepart); 2140 case APPLY: 2141 JCMethodInvocation speculativeMethodTree = 2142 (JCMethodInvocation)deferredAttr.attribSpeculative( 2143 tree, env, unknownExprInfo, 2144 argumentAttr.withLocalCacheContext()); 2145 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 2146 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 2147 env.enclClass.type : 2148 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 2149 Type owntype = types.memberType(receiverType, msym).getReturnType(); 2150 return primitiveOrBoxed(owntype); 2151 case NEWCLASS: 2152 JCExpression className = 2153 removeClassParams.translate(((JCNewClass)tree).clazz); 2154 JCExpression speculativeNewClassTree = 2155 (JCExpression)deferredAttr.attribSpeculative( 2156 className, env, unknownTypeInfo, 2157 argumentAttr.withLocalCacheContext()); 2158 return primitiveOrBoxed(speculativeNewClassTree.type); 2159 default: 2160 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo, 2161 argumentAttr.withLocalCacheContext()).type; 2162 return primitiveOrBoxed(speculativeType); 2163 } 2164 } 2165 //where 2166 boolean primitiveOrBoxed(Type t) { 2167 return (!t.hasTag(TYPEVAR) && !t.isErroneous() && types.unboxedTypeOrType(t).isPrimitive()); 2168 } 2169 2170 TreeTranslator removeClassParams = new TreeTranslator() { 2171 @Override 2172 public void visitTypeApply(JCTypeApply tree) { 2173 result = translate(tree.clazz); 2174 } 2175 }; 2176 2177 CheckContext conditionalContext(CheckContext checkContext) { 2178 return new Check.NestedCheckContext(checkContext) { 2179 //this will use enclosing check context to check compatibility of 2180 //subexpression against target type; if we are in a method check context, 2181 //depending on whether boxing is allowed, we could have incompatibilities 2182 @Override 2183 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2184 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details))); 2185 } 2186 }; 2187 } 2188 2189 /** Compute the type of a conditional expression, after 2190 * checking that it exists. See JLS 15.25. Does not take into 2191 * account the special case where condition and both arms 2192 * are constants. 2193 * 2194 * @param pos The source position to be used for error 2195 * diagnostics. 2196 * @param thentype The type of the expression's then-part. 2197 * @param elsetype The type of the expression's else-part. 2198 */ 2199 Type condType(List<DiagnosticPosition> positions, List<Type> condTypes) { 2200 if (condTypes.isEmpty()) { 2201 return syms.objectType; //TODO: how to handle? 2202 } 2203 Type first = condTypes.head; 2204 // If same type, that is the result 2205 if (condTypes.tail.stream().allMatch(t -> types.isSameType(first, t))) 2206 return first.baseType(); 2207 2208 List<Type> unboxedTypes = condTypes.stream() 2209 .map(t -> t.isPrimitive() ? t : types.unboxedType(t)) 2210 .collect(List.collector()); 2211 2212 // Otherwise, if both arms can be converted to a numeric 2213 // type, return the least numeric type that fits both arms 2214 // (i.e. return larger of the two, or return int if one 2215 // arm is short, the other is char). 2216 if (unboxedTypes.stream().allMatch(t -> t.isPrimitive())) { 2217 // If one arm has an integer subrange type (i.e., byte, 2218 // short, or char), and the other is an integer constant 2219 // that fits into the subrange, return the subrange type. 2220 for (Type type : unboxedTypes) { 2221 if (!type.getTag().isStrictSubRangeOf(INT)) { 2222 continue; 2223 } 2224 if (unboxedTypes.stream().filter(t -> t != type).allMatch(t -> t.hasTag(INT) && types.isAssignable(t, type))) 2225 return type.baseType(); 2226 } 2227 2228 for (TypeTag tag : primitiveTags) { 2229 Type candidate = syms.typeOfTag[tag.ordinal()]; 2230 if (unboxedTypes.stream().allMatch(t -> types.isSubtype(t, candidate))) { 2231 return candidate; 2232 } 2233 } 2234 } 2235 2236 // Those were all the cases that could result in a primitive 2237 condTypes = condTypes.stream() 2238 .map(t -> t.isPrimitive() ? types.boxedClass(t).type : t) 2239 .collect(List.collector()); 2240 2241 for (Type type : condTypes) { 2242 if (condTypes.stream().filter(t -> t != type).allMatch(t -> types.isAssignable(t, type))) 2243 return type.baseType(); 2244 } 2245 2246 Iterator<DiagnosticPosition> posIt = positions.iterator(); 2247 2248 condTypes = condTypes.stream() 2249 .map(t -> chk.checkNonVoid(posIt.next(), t)) 2250 .collect(List.collector()); 2251 2252 // both are known to be reference types. The result is 2253 // lub(thentype,elsetype). This cannot fail, as it will 2254 // always be possible to infer "Object" if nothing better. 2255 return types.lub(condTypes.stream() 2256 .map(t -> t.baseType()) 2257 .filter(t -> !t.hasTag(BOT)) 2258 .collect(List.collector())); 2259 } 2260 2261 static final TypeTag[] primitiveTags = new TypeTag[]{ 2262 BYTE, 2263 CHAR, 2264 SHORT, 2265 INT, 2266 LONG, 2267 FLOAT, 2268 DOUBLE, 2269 BOOLEAN, 2270 }; 2271 2272 Env<AttrContext> bindingEnv(Env<AttrContext> env, List<BindingSymbol> bindings) { 2273 return bindingEnv(env, env.tree, bindings); 2274 } 2275 2276 Env<AttrContext> bindingEnv(Env<AttrContext> env, JCTree newTree, List<BindingSymbol> bindings) { 2277 Env<AttrContext> env1 = env.dup(newTree, env.info.dup(env.info.scope.dup())); 2278 bindings.forEach(env1.info.scope::enter); 2279 return env1; 2280 } 2281 2282 public void visitIf(JCIf tree) { 2283 attribExpr(tree.cond, env, syms.booleanType); 2284 2285 // if (x) { y } [ else z ] 2286 // include x's bindings when true in y 2287 // include x's bindings when false in z 2288 2289 MatchBindings condBindings = matchBindings; 2290 Env<AttrContext> thenEnv = bindingEnv(env, condBindings.bindingsWhenTrue); 2291 2292 try { 2293 attribStat(tree.thenpart, thenEnv); 2294 } finally { 2295 thenEnv.info.scope.leave(); 2296 } 2297 2298 preFlow(tree.thenpart); 2299 boolean aliveAfterThen = flow.aliveAfter(env, tree.thenpart, make); 2300 boolean aliveAfterElse; 2301 2302 if (tree.elsepart != null) { 2303 Env<AttrContext> elseEnv = bindingEnv(env, condBindings.bindingsWhenFalse); 2304 try { 2305 attribStat(tree.elsepart, elseEnv); 2306 } finally { 2307 elseEnv.info.scope.leave(); 2308 } 2309 preFlow(tree.elsepart); 2310 aliveAfterElse = flow.aliveAfter(env, tree.elsepart, make); 2311 } else { 2312 aliveAfterElse = true; 2313 } 2314 2315 chk.checkEmptyIf(tree); 2316 2317 List<BindingSymbol> afterIfBindings = List.nil(); 2318 2319 if (aliveAfterThen && !aliveAfterElse) { 2320 afterIfBindings = condBindings.bindingsWhenTrue; 2321 } else if (aliveAfterElse && !aliveAfterThen) { 2322 afterIfBindings = condBindings.bindingsWhenFalse; 2323 } 2324 2325 addBindings2Scope(tree, afterIfBindings); 2326 2327 result = null; 2328 } 2329 2330 void preFlow(JCTree tree) { 2331 attrRecover.doRecovery(); 2332 new PostAttrAnalyzer() { 2333 @Override 2334 public void scan(JCTree tree) { 2335 if (tree == null || 2336 (tree.type != null && 2337 tree.type == Type.stuckType)) { 2338 //don't touch stuck expressions! 2339 return; 2340 } 2341 super.scan(tree); 2342 } 2343 2344 @Override 2345 public void visitClassDef(JCClassDecl that) { 2346 if (that.sym != null) { 2347 // Method preFlow shouldn't visit class definitions 2348 // that have not been entered and attributed. 2349 // See JDK-8254557 and JDK-8203277 for more details. 2350 super.visitClassDef(that); 2351 } 2352 } 2353 2354 @Override 2355 public void visitLambda(JCLambda that) { 2356 if (that.type != null) { 2357 // Method preFlow shouldn't visit lambda expressions 2358 // that have not been entered and attributed. 2359 // See JDK-8254557 and JDK-8203277 for more details. 2360 super.visitLambda(that); 2361 } 2362 } 2363 }.scan(tree); 2364 } 2365 2366 public void visitExec(JCExpressionStatement tree) { 2367 //a fresh environment is required for 292 inference to work properly --- 2368 //see Infer.instantiatePolymorphicSignatureInstance() 2369 Env<AttrContext> localEnv = env.dup(tree); 2370 attribExpr(tree.expr, localEnv); 2371 result = null; 2372 } 2373 2374 public void visitBreak(JCBreak tree) { 2375 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 2376 result = null; 2377 } 2378 2379 public void visitYield(JCYield tree) { 2380 if (env.info.yieldResult != null) { 2381 attribTree(tree.value, env, env.info.yieldResult); 2382 tree.target = findJumpTarget(tree.pos(), tree.getTag(), names.empty, env); 2383 } else { 2384 log.error(tree.pos(), tree.value.hasTag(PARENS) 2385 ? Errors.NoSwitchExpressionQualify 2386 : Errors.NoSwitchExpression); 2387 attribTree(tree.value, env, unknownExprInfo); 2388 } 2389 result = null; 2390 } 2391 2392 public void visitContinue(JCContinue tree) { 2393 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 2394 result = null; 2395 } 2396 //where 2397 /** Return the target of a break, continue or yield statement, 2398 * if it exists, report an error if not. 2399 * Note: The target of a labelled break or continue is the 2400 * (non-labelled) statement tree referred to by the label, 2401 * not the tree representing the labelled statement itself. 2402 * 2403 * @param pos The position to be used for error diagnostics 2404 * @param tag The tag of the jump statement. This is either 2405 * Tree.BREAK or Tree.CONTINUE. 2406 * @param label The label of the jump statement, or null if no 2407 * label is given. 2408 * @param env The environment current at the jump statement. 2409 */ 2410 private JCTree findJumpTarget(DiagnosticPosition pos, 2411 JCTree.Tag tag, 2412 Name label, 2413 Env<AttrContext> env) { 2414 Pair<JCTree, Error> jumpTarget = findJumpTargetNoError(tag, label, env); 2415 2416 if (jumpTarget.snd != null) { 2417 log.error(pos, jumpTarget.snd); 2418 } 2419 2420 return jumpTarget.fst; 2421 } 2422 /** Return the target of a break or continue statement, if it exists, 2423 * report an error if not. 2424 * Note: The target of a labelled break or continue is the 2425 * (non-labelled) statement tree referred to by the label, 2426 * not the tree representing the labelled statement itself. 2427 * 2428 * @param tag The tag of the jump statement. This is either 2429 * Tree.BREAK or Tree.CONTINUE. 2430 * @param label The label of the jump statement, or null if no 2431 * label is given. 2432 * @param env The environment current at the jump statement. 2433 */ 2434 private Pair<JCTree, JCDiagnostic.Error> findJumpTargetNoError(JCTree.Tag tag, 2435 Name label, 2436 Env<AttrContext> env) { 2437 // Search environments outwards from the point of jump. 2438 Env<AttrContext> env1 = env; 2439 JCDiagnostic.Error pendingError = null; 2440 LOOP: 2441 while (env1 != null) { 2442 switch (env1.tree.getTag()) { 2443 case LABELLED: 2444 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 2445 if (label == labelled.label) { 2446 // If jump is a continue, check that target is a loop. 2447 if (tag == CONTINUE) { 2448 if (!labelled.body.hasTag(DOLOOP) && 2449 !labelled.body.hasTag(WHILELOOP) && 2450 !labelled.body.hasTag(FORLOOP) && 2451 !labelled.body.hasTag(FOREACHLOOP)) { 2452 pendingError = Errors.NotLoopLabel(label); 2453 } 2454 // Found labelled statement target, now go inwards 2455 // to next non-labelled tree. 2456 return Pair.of(TreeInfo.referencedStatement(labelled), pendingError); 2457 } else { 2458 return Pair.of(labelled, pendingError); 2459 } 2460 } 2461 break; 2462 case DOLOOP: 2463 case WHILELOOP: 2464 case FORLOOP: 2465 case FOREACHLOOP: 2466 if (label == null) return Pair.of(env1.tree, pendingError); 2467 break; 2468 case SWITCH: 2469 if (label == null && tag == BREAK) return Pair.of(env1.tree, null); 2470 break; 2471 case SWITCH_EXPRESSION: 2472 if (tag == YIELD) { 2473 return Pair.of(env1.tree, null); 2474 } else if (tag == BREAK) { 2475 pendingError = Errors.BreakOutsideSwitchExpression; 2476 } else { 2477 pendingError = Errors.ContinueOutsideSwitchExpression; 2478 } 2479 break; 2480 case LAMBDA: 2481 case METHODDEF: 2482 case CLASSDEF: 2483 break LOOP; 2484 default: 2485 } 2486 env1 = env1.next; 2487 } 2488 if (label != null) 2489 return Pair.of(null, Errors.UndefLabel(label)); 2490 else if (pendingError != null) 2491 return Pair.of(null, pendingError); 2492 else if (tag == CONTINUE) 2493 return Pair.of(null, Errors.ContOutsideLoop); 2494 else 2495 return Pair.of(null, Errors.BreakOutsideSwitchLoop); 2496 } 2497 2498 public void visitReturn(JCReturn tree) { 2499 // Check that there is an enclosing method which is 2500 // nested within than the enclosing class. 2501 if (env.info.returnResult == null) { 2502 log.error(tree.pos(), Errors.RetOutsideMeth); 2503 } else if (env.info.yieldResult != null) { 2504 log.error(tree.pos(), Errors.ReturnOutsideSwitchExpression); 2505 } else if (!env.info.isLambda && 2506 !env.info.isNewClass && 2507 env.enclMethod != null && 2508 TreeInfo.isCompactConstructor(env.enclMethod)) { 2509 log.error(env.enclMethod, 2510 Errors.InvalidCanonicalConstructorInRecord(Fragments.Compact, env.enclMethod.sym.name, Fragments.CanonicalCantHaveReturnStatement)); 2511 } else { 2512 // Attribute return expression, if it exists, and check that 2513 // it conforms to result type of enclosing method. 2514 if (tree.expr != null) { 2515 if (env.info.returnResult.pt.hasTag(VOID)) { 2516 env.info.returnResult.checkContext.report(tree.expr.pos(), 2517 diags.fragment(Fragments.UnexpectedRetVal)); 2518 } 2519 attribTree(tree.expr, env, env.info.returnResult); 2520 } else if (!env.info.returnResult.pt.hasTag(VOID) && 2521 !env.info.returnResult.pt.hasTag(NONE)) { 2522 env.info.returnResult.checkContext.report(tree.pos(), 2523 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt))); 2524 } 2525 } 2526 result = null; 2527 } 2528 2529 public void visitThrow(JCThrow tree) { 2530 Type owntype = attribExpr(tree.expr, env, Type.noType); 2531 chk.checkType(tree, owntype, syms.throwableType); 2532 result = null; 2533 } 2534 2535 public void visitAssert(JCAssert tree) { 2536 attribExpr(tree.cond, env, syms.booleanType); 2537 if (tree.detail != null) { 2538 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 2539 } 2540 result = null; 2541 } 2542 2543 /** Visitor method for method invocations. 2544 * NOTE: The method part of an application will have in its type field 2545 * the return type of the method, not the method's type itself! 2546 */ 2547 public void visitApply(JCMethodInvocation tree) { 2548 // The local environment of a method application is 2549 // a new environment nested in the current one. 2550 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 2551 2552 // The types of the actual method arguments. 2553 List<Type> argtypes; 2554 2555 // The types of the actual method type arguments. 2556 List<Type> typeargtypes = null; 2557 2558 Name methName = TreeInfo.name(tree.meth); 2559 2560 boolean isConstructorCall = 2561 methName == names._this || methName == names._super; 2562 2563 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2564 if (isConstructorCall) { 2565 2566 // Attribute arguments, yielding list of argument types. 2567 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 2568 argtypes = argtypesBuf.toList(); 2569 typeargtypes = attribTypes(tree.typeargs, localEnv); 2570 2571 // Done with this()/super() parameters. End of constructor prologue. 2572 env.info.ctorPrologue = false; 2573 2574 // Variable `site' points to the class in which the called 2575 // constructor is defined. 2576 Type site = env.enclClass.sym.type; 2577 if (methName == names._super) { 2578 if (site == syms.objectType) { 2579 log.error(tree.meth.pos(), Errors.NoSuperclass(site)); 2580 site = types.createErrorType(syms.objectType); 2581 } else { 2582 site = types.supertype(site); 2583 } 2584 } 2585 2586 if (site.hasTag(CLASS)) { 2587 Type encl = site.getEnclosingType(); 2588 while (encl != null && encl.hasTag(TYPEVAR)) 2589 encl = encl.getUpperBound(); 2590 if (encl.hasTag(CLASS)) { 2591 // we are calling a nested class 2592 2593 if (tree.meth.hasTag(SELECT)) { 2594 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 2595 2596 // We are seeing a prefixed call, of the form 2597 // <expr>.super(...). 2598 // Check that the prefix expression conforms 2599 // to the outer instance type of the class. 2600 chk.checkRefType(qualifier.pos(), 2601 attribExpr(qualifier, localEnv, 2602 encl)); 2603 } else if (methName == names._super) { 2604 // qualifier omitted; check for existence 2605 // of an appropriate implicit qualifier. 2606 rs.resolveImplicitThis(tree.meth.pos(), 2607 localEnv, site, true); 2608 } 2609 } else if (tree.meth.hasTag(SELECT)) { 2610 log.error(tree.meth.pos(), 2611 Errors.IllegalQualNotIcls(site.tsym)); 2612 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site); 2613 } 2614 2615 // if we're calling a java.lang.Enum constructor, 2616 // prefix the implicit String and int parameters 2617 if (site.tsym == syms.enumSym) 2618 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 2619 2620 // Resolve the called constructor under the assumption 2621 // that we are referring to a superclass instance of the 2622 // current instance (JLS ???). 2623 boolean selectSuperPrev = localEnv.info.selectSuper; 2624 localEnv.info.selectSuper = true; 2625 localEnv.info.pendingResolutionPhase = null; 2626 Symbol sym = rs.resolveConstructor( 2627 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 2628 localEnv.info.selectSuper = selectSuperPrev; 2629 2630 // Set method symbol to resolved constructor... 2631 TreeInfo.setSymbol(tree.meth, sym); 2632 2633 // ...and check that it is legal in the current context. 2634 // (this will also set the tree's type) 2635 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 2636 checkId(tree.meth, site, sym, localEnv, 2637 new ResultInfo(kind, mpt)); 2638 } else if (site.hasTag(ERROR) && tree.meth.hasTag(SELECT)) { 2639 attribExpr(((JCFieldAccess) tree.meth).selected, localEnv, site); 2640 } 2641 // Otherwise, `site' is an error type and we do nothing 2642 result = tree.type = syms.voidType; 2643 } else { 2644 // Otherwise, we are seeing a regular method call. 2645 // Attribute the arguments, yielding list of argument types, ... 2646 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2647 argtypes = argtypesBuf.toList(); 2648 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 2649 2650 // ... and attribute the method using as a prototype a methodtype 2651 // whose formal argument types is exactly the list of actual 2652 // arguments (this will also set the method symbol). 2653 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 2654 localEnv.info.pendingResolutionPhase = null; 2655 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 2656 2657 // Compute the result type. 2658 Type restype = mtype.getReturnType(); 2659 if (restype.hasTag(WILDCARD)) 2660 throw new AssertionError(mtype); 2661 2662 Type qualifier = (tree.meth.hasTag(SELECT)) 2663 ? ((JCFieldAccess) tree.meth).selected.type 2664 : env.enclClass.sym.type; 2665 Symbol msym = TreeInfo.symbol(tree.meth); 2666 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 2667 2668 chk.checkRefTypes(tree.typeargs, typeargtypes); 2669 2670 // Check that value of resulting type is admissible in the 2671 // current context. Also, capture the return type 2672 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 2673 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 2674 } 2675 chk.validate(tree.typeargs, localEnv); 2676 } 2677 //where 2678 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 2679 if (msym != null && 2680 (msym.owner == syms.objectType.tsym || msym.owner.isInterface()) && 2681 methodName == names.getClass && 2682 argtypes.isEmpty()) { 2683 // as a special case, x.getClass() has type Class<? extends |X|> 2684 return new ClassType(restype.getEnclosingType(), 2685 List.of(new WildcardType(types.erasure(qualifierType.baseType()), 2686 BoundKind.EXTENDS, 2687 syms.boundClass)), 2688 restype.tsym, 2689 restype.getMetadata()); 2690 } else if (msym != null && 2691 msym.owner == syms.arrayClass && 2692 methodName == names.clone && 2693 types.isArray(qualifierType)) { 2694 // as a special case, array.clone() has a result that is 2695 // the same as static type of the array being cloned 2696 return qualifierType; 2697 } else { 2698 return restype; 2699 } 2700 } 2701 2702 /** Obtain a method type with given argument types. 2703 */ 2704 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 2705 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass); 2706 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 2707 } 2708 2709 public void visitNewClass(final JCNewClass tree) { 2710 Type owntype = types.createErrorType(tree.type); 2711 2712 // The local environment of a class creation is 2713 // a new environment nested in the current one. 2714 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 2715 2716 // The anonymous inner class definition of the new expression, 2717 // if one is defined by it. 2718 JCClassDecl cdef = tree.def; 2719 2720 // If enclosing class is given, attribute it, and 2721 // complete class name to be fully qualified 2722 JCExpression clazz = tree.clazz; // Class field following new 2723 JCExpression clazzid; // Identifier in class field 2724 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 2725 annoclazzid = null; 2726 2727 if (clazz.hasTag(TYPEAPPLY)) { 2728 clazzid = ((JCTypeApply) clazz).clazz; 2729 if (clazzid.hasTag(ANNOTATED_TYPE)) { 2730 annoclazzid = (JCAnnotatedType) clazzid; 2731 clazzid = annoclazzid.underlyingType; 2732 } 2733 } else { 2734 if (clazz.hasTag(ANNOTATED_TYPE)) { 2735 annoclazzid = (JCAnnotatedType) clazz; 2736 clazzid = annoclazzid.underlyingType; 2737 } else { 2738 clazzid = clazz; 2739 } 2740 } 2741 2742 JCExpression clazzid1 = clazzid; // The same in fully qualified form 2743 2744 if (tree.encl != null) { 2745 // We are seeing a qualified new, of the form 2746 // <expr>.new C <...> (...) ... 2747 // In this case, we let clazz stand for the name of the 2748 // allocated class C prefixed with the type of the qualifier 2749 // expression, so that we can 2750 // resolve it with standard techniques later. I.e., if 2751 // <expr> has type T, then <expr>.new C <...> (...) 2752 // yields a clazz T.C. 2753 Type encltype = chk.checkRefType(tree.encl.pos(), 2754 attribExpr(tree.encl, env)); 2755 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2756 // from expr to the combined type, or not? Yes, do this. 2757 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2758 ((JCIdent) clazzid).name); 2759 2760 EndPosTable endPosTable = this.env.toplevel.endPositions; 2761 endPosTable.storeEnd(clazzid1, clazzid.getEndPosition(endPosTable)); 2762 if (clazz.hasTag(ANNOTATED_TYPE)) { 2763 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2764 List<JCAnnotation> annos = annoType.annotations; 2765 2766 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2767 clazzid1 = make.at(tree.pos). 2768 TypeApply(clazzid1, 2769 ((JCTypeApply) clazz).arguments); 2770 } 2771 2772 clazzid1 = make.at(tree.pos). 2773 AnnotatedType(annos, clazzid1); 2774 } else if (clazz.hasTag(TYPEAPPLY)) { 2775 clazzid1 = make.at(tree.pos). 2776 TypeApply(clazzid1, 2777 ((JCTypeApply) clazz).arguments); 2778 } 2779 2780 clazz = clazzid1; 2781 } 2782 2783 // Attribute clazz expression and store 2784 // symbol + type back into the attributed tree. 2785 Type clazztype; 2786 2787 try { 2788 env.info.isNewClass = true; 2789 clazztype = TreeInfo.isEnumInit(env.tree) ? 2790 attribIdentAsEnumType(env, (JCIdent)clazz) : 2791 attribType(clazz, env); 2792 } finally { 2793 env.info.isNewClass = false; 2794 } 2795 2796 clazztype = chk.checkDiamond(tree, clazztype); 2797 chk.validate(clazz, localEnv); 2798 if (tree.encl != null) { 2799 // We have to work in this case to store 2800 // symbol + type back into the attributed tree. 2801 tree.clazz.type = clazztype; 2802 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2803 clazzid.type = ((JCIdent) clazzid).sym.type; 2804 if (annoclazzid != null) { 2805 annoclazzid.type = clazzid.type; 2806 } 2807 if (!clazztype.isErroneous()) { 2808 if (cdef != null && clazztype.tsym.isInterface()) { 2809 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew); 2810 } else if (clazztype.tsym.isStatic()) { 2811 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym)); 2812 } 2813 } 2814 } else if (!clazztype.tsym.isInterface() && 2815 clazztype.getEnclosingType().hasTag(CLASS)) { 2816 // Check for the existence of an apropos outer instance 2817 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2818 } 2819 2820 // Attribute constructor arguments. 2821 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2822 final KindSelector pkind = 2823 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2824 List<Type> argtypes = argtypesBuf.toList(); 2825 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2826 2827 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) { 2828 // Enums may not be instantiated except implicitly 2829 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2830 (!env.tree.hasTag(VARDEF) || 2831 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2832 ((JCVariableDecl) env.tree).init != tree)) 2833 log.error(tree.pos(), Errors.EnumCantBeInstantiated); 2834 2835 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2836 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2837 boolean skipNonDiamondPath = false; 2838 // Check that class is not abstract 2839 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2840 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2841 log.error(tree.pos(), 2842 Errors.AbstractCantBeInstantiated(clazztype.tsym)); 2843 skipNonDiamondPath = true; 2844 } else if (cdef != null && clazztype.tsym.isInterface()) { 2845 // Check that no constructor arguments are given to 2846 // anonymous classes implementing an interface 2847 if (!argtypes.isEmpty()) 2848 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs); 2849 2850 if (!typeargtypes.isEmpty()) 2851 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs); 2852 2853 // Error recovery: pretend no arguments were supplied. 2854 argtypes = List.nil(); 2855 typeargtypes = List.nil(); 2856 skipNonDiamondPath = true; 2857 } 2858 if (TreeInfo.isDiamond(tree)) { 2859 ClassType site = new ClassType(clazztype.getEnclosingType(), 2860 clazztype.tsym.type.getTypeArguments(), 2861 clazztype.tsym, 2862 clazztype.getMetadata()); 2863 2864 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2865 diamondEnv.info.selectSuper = cdef != null || tree.classDeclRemoved(); 2866 diamondEnv.info.pendingResolutionPhase = null; 2867 2868 //if the type of the instance creation expression is a class type 2869 //apply method resolution inference (JLS 15.12.2.7). The return type 2870 //of the resolved constructor will be a partially instantiated type 2871 Symbol constructor = rs.resolveDiamond(tree.pos(), 2872 diamondEnv, 2873 site, 2874 argtypes, 2875 typeargtypes); 2876 tree.constructor = constructor.baseSymbol(); 2877 2878 final TypeSymbol csym = clazztype.tsym; 2879 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2880 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2881 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2882 constructorType = checkId(tree, site, 2883 constructor, 2884 diamondEnv, 2885 diamondResult); 2886 2887 tree.clazz.type = types.createErrorType(clazztype); 2888 if (!constructorType.isErroneous()) { 2889 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2890 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2891 } 2892 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2893 } 2894 2895 // Resolve the called constructor under the assumption 2896 // that we are referring to a superclass instance of the 2897 // current instance (JLS ???). 2898 else if (!skipNonDiamondPath) { 2899 //the following code alters some of the fields in the current 2900 //AttrContext - hence, the current context must be dup'ed in 2901 //order to avoid downstream failures 2902 Env<AttrContext> rsEnv = localEnv.dup(tree); 2903 rsEnv.info.selectSuper = cdef != null; 2904 rsEnv.info.pendingResolutionPhase = null; 2905 tree.constructor = rs.resolveConstructor( 2906 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2907 if (cdef == null) { //do not check twice! 2908 tree.constructorType = checkId(tree, 2909 clazztype, 2910 tree.constructor, 2911 rsEnv, 2912 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2913 if (rsEnv.info.lastResolveVarargs()) 2914 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2915 } 2916 } 2917 2918 if (cdef != null) { 2919 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2920 return; 2921 } 2922 2923 if (tree.constructor != null && tree.constructor.kind == MTH) 2924 owntype = clazztype; 2925 } 2926 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2927 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2928 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2929 //we need to wait for inference to finish and then replace inference vars in the constructor type 2930 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2931 instantiatedContext -> { 2932 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2933 }); 2934 } 2935 chk.validate(tree.typeargs, localEnv); 2936 } 2937 2938 // where 2939 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2940 JCClassDecl cdef, Env<AttrContext> localEnv, 2941 List<Type> argtypes, List<Type> typeargtypes, 2942 KindSelector pkind) { 2943 // We are seeing an anonymous class instance creation. 2944 // In this case, the class instance creation 2945 // expression 2946 // 2947 // E.new <typeargs1>C<typargs2>(args) { ... } 2948 // 2949 // is represented internally as 2950 // 2951 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2952 // 2953 // This expression is then *transformed* as follows: 2954 // 2955 // (1) add an extends or implements clause 2956 // (2) add a constructor. 2957 // 2958 // For instance, if C is a class, and ET is the type of E, 2959 // the expression 2960 // 2961 // E.new <typeargs1>C<typargs2>(args) { ... } 2962 // 2963 // is translated to (where X is a fresh name and typarams is the 2964 // parameter list of the super constructor): 2965 // 2966 // new <typeargs1>X(<*nullchk*>E, args) where 2967 // X extends C<typargs2> { 2968 // <typarams> X(ET e, args) { 2969 // e.<typeargs1>super(args) 2970 // } 2971 // ... 2972 // } 2973 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2974 Type enclType = clazztype.getEnclosingType(); 2975 if (enclType != null && 2976 enclType.hasTag(CLASS) && 2977 !chk.checkDenotable((ClassType)enclType)) { 2978 log.error(tree.encl, Errors.EnclosingClassTypeNonDenotable(enclType)); 2979 } 2980 final boolean isDiamond = TreeInfo.isDiamond(tree); 2981 if (isDiamond 2982 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2983 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2984 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2985 Env<AttrContext> dupLocalEnv = copyEnv(localEnv); 2986 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2987 instantiatedContext -> { 2988 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2989 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2990 ResultInfo prevResult = this.resultInfo; 2991 try { 2992 this.resultInfo = resultInfoForClassDefinition; 2993 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2994 dupLocalEnv, argtypes, typeargtypes, pkind); 2995 } finally { 2996 this.resultInfo = prevResult; 2997 } 2998 }); 2999 } else { 3000 if (isDiamond && clazztype.hasTag(CLASS)) { 3001 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 3002 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 3003 // One or more types inferred in the previous steps is non-denotable. 3004 Fragment fragment = Diamond(clazztype.tsym); 3005 log.error(tree.clazz.pos(), 3006 Errors.CantApplyDiamond1( 3007 fragment, 3008 invalidDiamondArgs.size() > 1 ? 3009 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 3010 DiamondInvalidArg(invalidDiamondArgs, fragment))); 3011 } 3012 // For <>(){}, inferred types must also be accessible. 3013 for (Type t : clazztype.getTypeArguments()) { 3014 rs.checkAccessibleType(env, t); 3015 } 3016 } 3017 3018 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 3019 // false for isInterface call even when the original type is an interface. 3020 boolean implementing = clazztype.tsym.isInterface() || 3021 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) && 3022 clazztype.getOriginalType().tsym.isInterface(); 3023 3024 if (implementing) { 3025 cdef.implementing = List.of(clazz); 3026 } else { 3027 cdef.extending = clazz; 3028 } 3029 3030 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3031 rs.isSerializable(clazztype)) { 3032 localEnv.info.isSerializable = true; 3033 } 3034 3035 attribStat(cdef, localEnv); 3036 3037 List<Type> finalargtypes; 3038 // If an outer instance is given, 3039 // prefix it to the constructor arguments 3040 // and delete it from the new expression 3041 if (tree.encl != null && !clazztype.tsym.isInterface()) { 3042 finalargtypes = argtypes.prepend(tree.encl.type); 3043 } else { 3044 finalargtypes = argtypes; 3045 } 3046 3047 // Reassign clazztype and recompute constructor. As this necessarily involves 3048 // another attribution pass for deferred types in the case of <>, replicate 3049 // them. Original arguments have right decorations already. 3050 if (isDiamond && pkind.contains(KindSelector.POLY)) { 3051 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 3052 } 3053 3054 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type) 3055 : cdef.sym.type; 3056 Symbol sym = tree.constructor = rs.resolveConstructor( 3057 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 3058 Assert.check(!sym.kind.isResolutionError()); 3059 tree.constructor = sym; 3060 tree.constructorType = checkId(tree, 3061 clazztype, 3062 tree.constructor, 3063 localEnv, 3064 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 3065 } 3066 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 3067 clazztype : types.createErrorType(tree.type); 3068 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 3069 chk.validate(tree.typeargs, localEnv); 3070 } 3071 3072 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 3073 return new Check.NestedCheckContext(checkContext) { 3074 @Override 3075 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 3076 enclosingContext.report(clazz.clazz, 3077 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details))); 3078 } 3079 }; 3080 } 3081 3082 /** Make an attributed null check tree. 3083 */ 3084 public JCExpression makeNullCheck(JCExpression arg) { 3085 // optimization: new Outer() can never be null; skip null check 3086 if (arg.getTag() == NEWCLASS) 3087 return arg; 3088 // optimization: X.this is never null; skip null check 3089 Name name = TreeInfo.name(arg); 3090 if (name == names._this || name == names._super) return arg; 3091 3092 JCTree.Tag optag = NULLCHK; 3093 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 3094 tree.operator = operators.resolveUnary(arg, optag, arg.type); 3095 tree.type = arg.type; 3096 return tree; 3097 } 3098 3099 public void visitNewArray(JCNewArray tree) { 3100 Type owntype = types.createErrorType(tree.type); 3101 Env<AttrContext> localEnv = env.dup(tree); 3102 Type elemtype; 3103 if (tree.elemtype != null) { 3104 elemtype = attribType(tree.elemtype, localEnv); 3105 chk.validate(tree.elemtype, localEnv); 3106 owntype = elemtype; 3107 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 3108 attribExpr(l.head, localEnv, syms.intType); 3109 owntype = new ArrayType(owntype, syms.arrayClass); 3110 } 3111 } else { 3112 // we are seeing an untyped aggregate { ... } 3113 // this is allowed only if the prototype is an array 3114 if (pt().hasTag(ARRAY)) { 3115 elemtype = types.elemtype(pt()); 3116 } else { 3117 if (!pt().hasTag(ERROR) && 3118 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 3119 log.error(tree.pos(), 3120 Errors.IllegalInitializerForType(pt())); 3121 } 3122 elemtype = types.createErrorType(pt()); 3123 } 3124 } 3125 if (tree.elems != null) { 3126 attribExprs(tree.elems, localEnv, elemtype); 3127 owntype = new ArrayType(elemtype, syms.arrayClass); 3128 } 3129 if (!types.isReifiable(elemtype)) 3130 log.error(tree.pos(), Errors.GenericArrayCreation); 3131 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3132 } 3133 3134 /* 3135 * A lambda expression can only be attributed when a target-type is available. 3136 * In addition, if the target-type is that of a functional interface whose 3137 * descriptor contains inference variables in argument position the lambda expression 3138 * is 'stuck' (see DeferredAttr). 3139 */ 3140 @Override 3141 public void visitLambda(final JCLambda that) { 3142 boolean wrongContext = false; 3143 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 3144 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 3145 //lambda only allowed in assignment or method invocation/cast context 3146 log.error(that.pos(), Errors.UnexpectedLambda); 3147 } 3148 resultInfo = recoveryInfo; 3149 wrongContext = true; 3150 } 3151 //create an environment for attribution of the lambda expression 3152 final Env<AttrContext> localEnv = lambdaEnv(that, env); 3153 boolean needsRecovery = 3154 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 3155 try { 3156 if (needsRecovery && rs.isSerializable(pt())) { 3157 localEnv.info.isSerializable = true; 3158 localEnv.info.isSerializableLambda = true; 3159 } 3160 List<Type> explicitParamTypes = null; 3161 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 3162 //attribute lambda parameters 3163 attribStats(that.params, localEnv); 3164 explicitParamTypes = TreeInfo.types(that.params); 3165 } 3166 3167 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 3168 Type currentTarget = targetInfo.target; 3169 Type lambdaType = targetInfo.descriptor; 3170 3171 if (currentTarget.isErroneous()) { 3172 result = that.type = currentTarget; 3173 return; 3174 } 3175 3176 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 3177 3178 if (lambdaType.hasTag(FORALL)) { 3179 //lambda expression target desc cannot be a generic method 3180 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType, 3181 kindName(currentTarget.tsym), 3182 currentTarget.tsym); 3183 resultInfo.checkContext.report(that, diags.fragment(msg)); 3184 result = that.type = types.createErrorType(pt()); 3185 return; 3186 } 3187 3188 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 3189 //add param type info in the AST 3190 List<Type> actuals = lambdaType.getParameterTypes(); 3191 List<JCVariableDecl> params = that.params; 3192 3193 boolean arityMismatch = false; 3194 3195 while (params.nonEmpty()) { 3196 if (actuals.isEmpty()) { 3197 //not enough actuals to perform lambda parameter inference 3198 arityMismatch = true; 3199 } 3200 //reset previously set info 3201 Type argType = arityMismatch ? 3202 syms.errType : 3203 actuals.head; 3204 if (params.head.isImplicitlyTyped()) { 3205 setSyntheticVariableType(params.head, argType); 3206 } 3207 params.head.sym = null; 3208 actuals = actuals.isEmpty() ? 3209 actuals : 3210 actuals.tail; 3211 params = params.tail; 3212 } 3213 3214 //attribute lambda parameters 3215 attribStats(that.params, localEnv); 3216 3217 if (arityMismatch) { 3218 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda)); 3219 result = that.type = types.createErrorType(currentTarget); 3220 return; 3221 } 3222 } 3223 3224 //from this point on, no recovery is needed; if we are in assignment context 3225 //we will be able to attribute the whole lambda body, regardless of errors; 3226 //if we are in a 'check' method context, and the lambda is not compatible 3227 //with the target-type, it will be recovered anyway in Attr.checkId 3228 needsRecovery = false; 3229 3230 ResultInfo bodyResultInfo = localEnv.info.returnResult = 3231 lambdaBodyResult(that, lambdaType, resultInfo); 3232 3233 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 3234 attribTree(that.getBody(), localEnv, bodyResultInfo); 3235 } else { 3236 JCBlock body = (JCBlock)that.body; 3237 if (body == breakTree && 3238 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 3239 breakTreeFound(copyEnv(localEnv)); 3240 } 3241 attribStats(body.stats, localEnv); 3242 } 3243 3244 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3245 3246 boolean isSpeculativeRound = 3247 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3248 3249 preFlow(that); 3250 flow.analyzeLambda(env, that, make, isSpeculativeRound); 3251 3252 that.type = currentTarget; //avoids recovery at this stage 3253 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 3254 3255 if (!isSpeculativeRound) { 3256 //add thrown types as bounds to the thrown types free variables if needed: 3257 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 3258 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 3259 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) { 3260 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes())); 3261 } 3262 } 3263 3264 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 3265 } 3266 result = wrongContext ? that.type = types.createErrorType(pt()) 3267 : check(that, currentTarget, KindSelector.VAL, resultInfo); 3268 } catch (Types.FunctionDescriptorLookupError ex) { 3269 JCDiagnostic cause = ex.getDiagnostic(); 3270 resultInfo.checkContext.report(that, cause); 3271 result = that.type = types.createErrorType(pt()); 3272 return; 3273 } catch (CompletionFailure cf) { 3274 chk.completionError(that.pos(), cf); 3275 } catch (Throwable t) { 3276 //when an unexpected exception happens, avoid attempts to attribute the same tree again 3277 //as that would likely cause the same exception again. 3278 needsRecovery = false; 3279 throw t; 3280 } finally { 3281 localEnv.info.scope.leave(); 3282 if (needsRecovery) { 3283 Type prevResult = result; 3284 try { 3285 attribTree(that, env, recoveryInfo); 3286 } finally { 3287 if (result == Type.recoveryType) { 3288 result = prevResult; 3289 } 3290 } 3291 } 3292 } 3293 } 3294 //where 3295 class TargetInfo { 3296 Type target; 3297 Type descriptor; 3298 3299 public TargetInfo(Type target, Type descriptor) { 3300 this.target = target; 3301 this.descriptor = descriptor; 3302 } 3303 } 3304 3305 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 3306 Type lambdaType; 3307 Type currentTarget = resultInfo.pt; 3308 if (resultInfo.pt != Type.recoveryType) { 3309 /* We need to adjust the target. If the target is an 3310 * intersection type, for example: SAM & I1 & I2 ... 3311 * the target will be updated to SAM 3312 */ 3313 currentTarget = targetChecker.visit(currentTarget, that); 3314 if (!currentTarget.isIntersection()) { 3315 if (explicitParamTypes != null) { 3316 currentTarget = infer.instantiateFunctionalInterface(that, 3317 currentTarget, explicitParamTypes, resultInfo.checkContext); 3318 } 3319 currentTarget = types.removeWildcards(currentTarget); 3320 lambdaType = types.findDescriptorType(currentTarget); 3321 } else { 3322 IntersectionClassType ict = (IntersectionClassType)currentTarget; 3323 ListBuffer<Type> components = new ListBuffer<>(); 3324 for (Type bound : ict.getExplicitComponents()) { 3325 if (explicitParamTypes != null) { 3326 try { 3327 bound = infer.instantiateFunctionalInterface(that, 3328 bound, explicitParamTypes, resultInfo.checkContext); 3329 } catch (FunctionDescriptorLookupError t) { 3330 // do nothing 3331 } 3332 } 3333 bound = types.removeWildcards(bound); 3334 components.add(bound); 3335 } 3336 currentTarget = types.makeIntersectionType(components.toList()); 3337 currentTarget.tsym.flags_field |= INTERFACE; 3338 lambdaType = types.findDescriptorType(currentTarget); 3339 } 3340 3341 } else { 3342 currentTarget = Type.recoveryType; 3343 lambdaType = fallbackDescriptorType(that); 3344 } 3345 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 3346 //lambda expression target desc cannot be a generic method 3347 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType, 3348 kindName(currentTarget.tsym), 3349 currentTarget.tsym); 3350 resultInfo.checkContext.report(that, diags.fragment(msg)); 3351 currentTarget = types.createErrorType(pt()); 3352 } 3353 return new TargetInfo(currentTarget, lambdaType); 3354 } 3355 3356 void preFlow(JCLambda tree) { 3357 attrRecover.doRecovery(); 3358 new PostAttrAnalyzer() { 3359 @Override 3360 public void scan(JCTree tree) { 3361 if (tree == null || 3362 (tree.type != null && 3363 tree.type == Type.stuckType)) { 3364 //don't touch stuck expressions! 3365 return; 3366 } 3367 super.scan(tree); 3368 } 3369 3370 @Override 3371 public void visitClassDef(JCClassDecl that) { 3372 // or class declaration trees! 3373 } 3374 3375 public void visitLambda(JCLambda that) { 3376 // or lambda expressions! 3377 } 3378 }.scan(tree.body); 3379 } 3380 3381 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 3382 3383 @Override 3384 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 3385 return t.isIntersection() ? 3386 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 3387 } 3388 3389 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 3390 types.findDescriptorSymbol(makeNotionalInterface(ict, pos)); 3391 return ict; 3392 } 3393 3394 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) { 3395 ListBuffer<Type> targs = new ListBuffer<>(); 3396 ListBuffer<Type> supertypes = new ListBuffer<>(); 3397 for (Type i : ict.interfaces_field) { 3398 if (i.isParameterized()) { 3399 targs.appendList(i.tsym.type.allparams()); 3400 } 3401 supertypes.append(i.tsym.type); 3402 } 3403 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 3404 notionalIntf.allparams_field = targs.toList(); 3405 notionalIntf.tsym.flags_field |= INTERFACE; 3406 return notionalIntf.tsym; 3407 } 3408 }; 3409 3410 private Type fallbackDescriptorType(JCExpression tree) { 3411 switch (tree.getTag()) { 3412 case LAMBDA: 3413 JCLambda lambda = (JCLambda)tree; 3414 List<Type> argtypes = List.nil(); 3415 for (JCVariableDecl param : lambda.params) { 3416 argtypes = param.vartype != null && param.vartype.type != null ? 3417 argtypes.append(param.vartype.type) : 3418 argtypes.append(syms.errType); 3419 } 3420 return new MethodType(argtypes, Type.recoveryType, 3421 List.of(syms.throwableType), syms.methodClass); 3422 case REFERENCE: 3423 return new MethodType(List.nil(), Type.recoveryType, 3424 List.of(syms.throwableType), syms.methodClass); 3425 default: 3426 Assert.error("Cannot get here!"); 3427 } 3428 return null; 3429 } 3430 3431 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 3432 final InferenceContext inferenceContext, final Type... ts) { 3433 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 3434 } 3435 3436 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 3437 final InferenceContext inferenceContext, final List<Type> ts) { 3438 if (inferenceContext.free(ts)) { 3439 inferenceContext.addFreeTypeListener(ts, 3440 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts))); 3441 } else { 3442 for (Type t : ts) { 3443 rs.checkAccessibleType(env, t); 3444 } 3445 } 3446 } 3447 3448 /** 3449 * Lambda/method reference have a special check context that ensures 3450 * that i.e. a lambda return type is compatible with the expected 3451 * type according to both the inherited context and the assignment 3452 * context. 3453 */ 3454 class FunctionalReturnContext extends Check.NestedCheckContext { 3455 3456 FunctionalReturnContext(CheckContext enclosingContext) { 3457 super(enclosingContext); 3458 } 3459 3460 @Override 3461 public boolean compatible(Type found, Type req, Warner warn) { 3462 //return type must be compatible in both current context and assignment context 3463 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 3464 } 3465 3466 @Override 3467 public void report(DiagnosticPosition pos, JCDiagnostic details) { 3468 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details))); 3469 } 3470 } 3471 3472 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 3473 3474 JCExpression expr; 3475 boolean expStmtExpected; 3476 3477 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 3478 super(enclosingContext); 3479 this.expr = expr; 3480 } 3481 3482 @Override 3483 public void report(DiagnosticPosition pos, JCDiagnostic details) { 3484 if (expStmtExpected) { 3485 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 3486 } else { 3487 super.report(pos, details); 3488 } 3489 } 3490 3491 @Override 3492 public boolean compatible(Type found, Type req, Warner warn) { 3493 //a void return is compatible with an expression statement lambda 3494 if (req.hasTag(VOID)) { 3495 expStmtExpected = true; 3496 return TreeInfo.isExpressionStatement(expr); 3497 } else { 3498 return super.compatible(found, req, warn); 3499 } 3500 } 3501 } 3502 3503 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 3504 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 3505 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 3506 new FunctionalReturnContext(resultInfo.checkContext); 3507 3508 return descriptor.getReturnType() == Type.recoveryType ? 3509 recoveryInfo : 3510 new ResultInfo(KindSelector.VAL, 3511 descriptor.getReturnType(), funcContext); 3512 } 3513 3514 /** 3515 * Lambda compatibility. Check that given return types, thrown types, parameter types 3516 * are compatible with the expected functional interface descriptor. This means that: 3517 * (i) parameter types must be identical to those of the target descriptor; (ii) return 3518 * types must be compatible with the return type of the expected descriptor. 3519 */ 3520 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 3521 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 3522 3523 //return values have already been checked - but if lambda has no return 3524 //values, we must ensure that void/value compatibility is correct; 3525 //this amounts at checking that, if a lambda body can complete normally, 3526 //the descriptor's return type must be void 3527 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 3528 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 3529 Fragment msg = 3530 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType)); 3531 checkContext.report(tree, 3532 diags.fragment(msg)); 3533 } 3534 3535 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 3536 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 3537 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda)); 3538 } 3539 } 3540 3541 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 3542 * static field and that lambda has type annotations, these annotations will 3543 * also be stored at these fake clinit methods. 3544 * 3545 * LambdaToMethod also use fake clinit methods so they can be reused. 3546 * Also as LTM is a phase subsequent to attribution, the methods from 3547 * clinits can be safely removed by LTM to save memory. 3548 */ 3549 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 3550 3551 public MethodSymbol removeClinit(ClassSymbol sym) { 3552 return clinits.remove(sym); 3553 } 3554 3555 /* This method returns an environment to be used to attribute a lambda 3556 * expression. 3557 * 3558 * The owner of this environment is a method symbol. If the current owner 3559 * is not a method, for example if the lambda is used to initialize 3560 * a field, then if the field is: 3561 * 3562 * - an instance field, we use the first constructor. 3563 * - a static field, we create a fake clinit method. 3564 */ 3565 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 3566 Env<AttrContext> lambdaEnv; 3567 Symbol owner = env.info.scope.owner; 3568 if (owner.kind == VAR && owner.owner.kind == TYP) { 3569 //field initializer 3570 ClassSymbol enclClass = owner.enclClass(); 3571 Symbol newScopeOwner = env.info.scope.owner; 3572 /* if the field isn't static, then we can get the first constructor 3573 * and use it as the owner of the environment. This is what 3574 * LTM code is doing to look for type annotations so we are fine. 3575 */ 3576 if ((owner.flags() & STATIC) == 0) { 3577 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 3578 newScopeOwner = s; 3579 break; 3580 } 3581 } else { 3582 /* if the field is static then we need to create a fake clinit 3583 * method, this method can later be reused by LTM. 3584 */ 3585 MethodSymbol clinit = clinits.get(enclClass); 3586 if (clinit == null) { 3587 Type clinitType = new MethodType(List.nil(), 3588 syms.voidType, List.nil(), syms.methodClass); 3589 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 3590 names.clinit, clinitType, enclClass); 3591 clinit.params = List.nil(); 3592 clinits.put(enclClass, clinit); 3593 } 3594 newScopeOwner = clinit; 3595 } 3596 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 3597 } else { 3598 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 3599 } 3600 lambdaEnv.info.yieldResult = null; 3601 lambdaEnv.info.isLambda = true; 3602 return lambdaEnv; 3603 } 3604 3605 @Override 3606 public void visitReference(final JCMemberReference that) { 3607 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 3608 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) { 3609 //method reference only allowed in assignment or method invocation/cast context 3610 log.error(that.pos(), Errors.UnexpectedMref); 3611 } 3612 result = that.type = types.createErrorType(pt()); 3613 return; 3614 } 3615 final Env<AttrContext> localEnv = env.dup(that); 3616 try { 3617 //attribute member reference qualifier - if this is a constructor 3618 //reference, the expected kind must be a type 3619 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 3620 3621 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 3622 exprType = chk.checkConstructorRefType(that.expr, exprType); 3623 if (!exprType.isErroneous() && 3624 exprType.isRaw() && 3625 that.typeargs != null) { 3626 log.error(that.expr.pos(), 3627 Errors.InvalidMref(Kinds.kindName(that.getMode()), 3628 Fragments.MrefInferAndExplicitParams)); 3629 exprType = types.createErrorType(exprType); 3630 } 3631 } 3632 3633 if (exprType.isErroneous()) { 3634 //if the qualifier expression contains problems, 3635 //give up attribution of method reference 3636 result = that.type = exprType; 3637 return; 3638 } 3639 3640 if (TreeInfo.isStaticSelector(that.expr, names)) { 3641 //if the qualifier is a type, validate it; raw warning check is 3642 //omitted as we don't know at this stage as to whether this is a 3643 //raw selector (because of inference) 3644 chk.validate(that.expr, env, false); 3645 } else { 3646 Symbol lhsSym = TreeInfo.symbol(that.expr); 3647 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 3648 } 3649 //attrib type-arguments 3650 List<Type> typeargtypes = List.nil(); 3651 if (that.typeargs != null) { 3652 typeargtypes = attribTypes(that.typeargs, localEnv); 3653 } 3654 3655 boolean isTargetSerializable = 3656 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3657 rs.isSerializable(pt()); 3658 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 3659 Type currentTarget = targetInfo.target; 3660 Type desc = targetInfo.descriptor; 3661 3662 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 3663 List<Type> argtypes = desc.getParameterTypes(); 3664 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 3665 3666 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 3667 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 3668 } 3669 3670 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 3671 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 3672 try { 3673 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 3674 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck, 3675 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 3676 } finally { 3677 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 3678 } 3679 3680 Symbol refSym = refResult.fst; 3681 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 3682 3683 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 3684 * JDK-8075541 3685 */ 3686 if (refSym.kind != MTH) { 3687 boolean targetError; 3688 switch (refSym.kind) { 3689 case ABSENT_MTH: 3690 case MISSING_ENCL: 3691 targetError = false; 3692 break; 3693 case WRONG_MTH: 3694 case WRONG_MTHS: 3695 case AMBIGUOUS: 3696 case HIDDEN: 3697 case STATICERR: 3698 targetError = true; 3699 break; 3700 default: 3701 Assert.error("unexpected result kind " + refSym.kind); 3702 targetError = false; 3703 } 3704 3705 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()) 3706 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 3707 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 3708 3709 JCDiagnostic diag = diags.create(log.currentSource(), that, 3710 targetError ? 3711 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) : 3712 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag)); 3713 3714 if (targetError && currentTarget == Type.recoveryType) { 3715 //a target error doesn't make sense during recovery stage 3716 //as we don't know what actual parameter types are 3717 result = that.type = currentTarget; 3718 return; 3719 } else { 3720 if (targetError) { 3721 resultInfo.checkContext.report(that, diag); 3722 } else { 3723 log.report(diag); 3724 } 3725 result = that.type = types.createErrorType(currentTarget); 3726 return; 3727 } 3728 } 3729 3730 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym; 3731 that.kind = lookupHelper.referenceKind(that.sym); 3732 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 3733 3734 if (desc.getReturnType() == Type.recoveryType) { 3735 // stop here 3736 result = that.type = currentTarget; 3737 return; 3738 } 3739 3740 if (!env.info.attributionMode.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) { 3741 Type enclosingType = exprType.getEnclosingType(); 3742 if (enclosingType != null && enclosingType.hasTag(CLASS)) { 3743 // Check for the existence of an appropriate outer instance 3744 rs.resolveImplicitThis(that.pos(), env, exprType); 3745 } 3746 } 3747 3748 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 3749 3750 if (that.getMode() == ReferenceMode.INVOKE && 3751 TreeInfo.isStaticSelector(that.expr, names) && 3752 that.kind.isUnbound() && 3753 lookupHelper.site.isRaw()) { 3754 chk.checkRaw(that.expr, localEnv); 3755 } 3756 3757 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 3758 exprType.getTypeArguments().nonEmpty()) { 3759 //static ref with class type-args 3760 log.error(that.expr.pos(), 3761 Errors.InvalidMref(Kinds.kindName(that.getMode()), 3762 Fragments.StaticMrefWithTargs)); 3763 result = that.type = types.createErrorType(currentTarget); 3764 return; 3765 } 3766 3767 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 3768 // Check that super-qualified symbols are not abstract (JLS) 3769 rs.checkNonAbstract(that.pos(), that.sym); 3770 } 3771 3772 if (isTargetSerializable) { 3773 chk.checkAccessFromSerializableElement(that, true); 3774 } 3775 } 3776 3777 ResultInfo checkInfo = 3778 resultInfo.dup(newMethodTemplate( 3779 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 3780 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 3781 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 3782 3783 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 3784 3785 if (that.kind.isUnbound() && 3786 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 3787 //re-generate inference constraints for unbound receiver 3788 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 3789 //cannot happen as this has already been checked - we just need 3790 //to regenerate the inference constraints, as that has been lost 3791 //as a result of the call to inferenceContext.save() 3792 Assert.error("Can't get here"); 3793 } 3794 } 3795 3796 if (!refType.isErroneous()) { 3797 refType = types.createMethodTypeWithReturn(refType, 3798 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3799 } 3800 3801 //go ahead with standard method reference compatibility check - note that param check 3802 //is a no-op (as this has been taken care during method applicability) 3803 boolean isSpeculativeRound = 3804 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3805 3806 that.type = currentTarget; //avoids recovery at this stage 3807 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3808 if (!isSpeculativeRound) { 3809 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3810 } 3811 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3812 } catch (Types.FunctionDescriptorLookupError ex) { 3813 JCDiagnostic cause = ex.getDiagnostic(); 3814 resultInfo.checkContext.report(that, cause); 3815 result = that.type = types.createErrorType(pt()); 3816 return; 3817 } 3818 } 3819 //where 3820 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3821 //if this is a constructor reference, the expected kind must be a type 3822 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3823 KindSelector.VAL_TYP : KindSelector.TYP, 3824 Type.noType); 3825 } 3826 3827 3828 @SuppressWarnings("fallthrough") 3829 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3830 InferenceContext inferenceContext = checkContext.inferenceContext(); 3831 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3832 3833 Type resType; 3834 switch (tree.getMode()) { 3835 case NEW: 3836 if (!tree.expr.type.isRaw()) { 3837 resType = tree.expr.type; 3838 break; 3839 } 3840 default: 3841 resType = refType.getReturnType(); 3842 } 3843 3844 Type incompatibleReturnType = resType; 3845 3846 if (returnType.hasTag(VOID)) { 3847 incompatibleReturnType = null; 3848 } 3849 3850 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3851 if (resType.isErroneous() || 3852 new FunctionalReturnContext(checkContext).compatible(resType, returnType, 3853 checkContext.checkWarner(tree, resType, returnType))) { 3854 incompatibleReturnType = null; 3855 } 3856 } 3857 3858 if (incompatibleReturnType != null) { 3859 Fragment msg = 3860 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType())); 3861 checkContext.report(tree, diags.fragment(msg)); 3862 } else { 3863 if (inferenceContext.free(refType)) { 3864 // we need to wait for inference to finish and then replace inference vars in the referent type 3865 inferenceContext.addFreeTypeListener(List.of(refType), 3866 instantiatedContext -> { 3867 tree.referentType = instantiatedContext.asInstType(refType); 3868 }); 3869 } else { 3870 tree.referentType = refType; 3871 } 3872 } 3873 3874 if (!speculativeAttr) { 3875 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) { 3876 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes())); 3877 } 3878 } 3879 } 3880 3881 boolean checkExConstraints( 3882 List<Type> thrownByFuncExpr, 3883 List<Type> thrownAtFuncType, 3884 InferenceContext inferenceContext) { 3885 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that 3886 * are not proper types 3887 */ 3888 List<Type> nonProperList = thrownAtFuncType.stream() 3889 .filter(e -> inferenceContext.free(e)).collect(List.collector()); 3890 List<Type> properList = thrownAtFuncType.diff(nonProperList); 3891 3892 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or 3893 * in the throws clause of the invocation type of the method reference's compile-time 3894 * declaration 3895 */ 3896 List<Type> checkedList = thrownByFuncExpr.stream() 3897 .filter(e -> chk.isChecked(e)).collect(List.collector()); 3898 3899 /** If n = 0 (the function type's throws clause consists only of proper types), then 3900 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type 3901 * in the throws clause, the constraint reduces to false; otherwise, the constraint 3902 * reduces to true 3903 */ 3904 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>(); 3905 for (Type checked : checkedList) { 3906 boolean isSubtype = false; 3907 for (Type proper : properList) { 3908 if (types.isSubtype(checked, proper)) { 3909 isSubtype = true; 3910 break; 3911 } 3912 } 3913 if (!isSubtype) { 3914 uncaughtByProperTypes.add(checked); 3915 } 3916 } 3917 3918 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) { 3919 return false; 3920 } 3921 3922 /** If n > 0, the constraint reduces to a set of subtyping constraints: 3923 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the 3924 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej> 3925 */ 3926 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList); 3927 uncaughtByProperTypes.forEach(checkedEx -> { 3928 nonProperAsUndet.forEach(nonProper -> { 3929 types.isSubtype(checkedEx, nonProper); 3930 }); 3931 }); 3932 3933 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej 3934 */ 3935 nonProperAsUndet.stream() 3936 .filter(t -> t.hasTag(UNDETVAR)) 3937 .forEach(t -> ((UndetVar)t).setThrow()); 3938 return true; 3939 } 3940 3941 /** 3942 * Set functional type info on the underlying AST. Note: as the target descriptor 3943 * might contain inference variables, we might need to register an hook in the 3944 * current inference context. 3945 */ 3946 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3947 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3948 if (checkContext.inferenceContext().free(descriptorType)) { 3949 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), 3950 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3951 inferenceContext.asInstType(primaryTarget), checkContext)); 3952 } else { 3953 if (pt.hasTag(CLASS)) { 3954 fExpr.target = primaryTarget; 3955 } 3956 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3957 pt != Type.recoveryType) { 3958 //check that functional interface class is well-formed 3959 try { 3960 /* Types.makeFunctionalInterfaceClass() may throw an exception 3961 * when it's executed post-inference. See the listener code 3962 * above. 3963 */ 3964 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3965 names.empty, fExpr.target, ABSTRACT); 3966 if (csym != null) { 3967 chk.checkImplementations(env.tree, csym, csym); 3968 try { 3969 //perform an additional functional interface check on the synthetic class, 3970 //as there may be spurious errors for raw targets - because of existing issues 3971 //with membership and inheritance (see JDK-8074570). 3972 csym.flags_field |= INTERFACE; 3973 types.findDescriptorType(csym.type); 3974 } catch (FunctionDescriptorLookupError err) { 3975 resultInfo.checkContext.report(fExpr, 3976 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target))); 3977 } 3978 } 3979 } catch (Types.FunctionDescriptorLookupError ex) { 3980 JCDiagnostic cause = ex.getDiagnostic(); 3981 resultInfo.checkContext.report(env.tree, cause); 3982 } 3983 } 3984 } 3985 } 3986 3987 public void visitParens(JCParens tree) { 3988 Type owntype = attribTree(tree.expr, env, resultInfo); 3989 result = check(tree, owntype, pkind(), resultInfo); 3990 Symbol sym = TreeInfo.symbol(tree); 3991 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK) && sym.kind != Kind.ERR) 3992 log.error(tree.pos(), Errors.IllegalParenthesizedExpression); 3993 } 3994 3995 public void visitAssign(JCAssign tree) { 3996 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3997 Type capturedType = capture(owntype); 3998 attribExpr(tree.rhs, env, owntype); 3999 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 4000 } 4001 4002 public void visitAssignop(JCAssignOp tree) { 4003 // Attribute arguments. 4004 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 4005 Type operand = attribExpr(tree.rhs, env); 4006 // Find operator. 4007 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 4008 if (operator != operators.noOpSymbol && 4009 !owntype.isErroneous() && 4010 !operand.isErroneous()) { 4011 chk.checkDivZero(tree.rhs.pos(), operator, operand); 4012 chk.checkCastable(tree.rhs.pos(), 4013 operator.type.getReturnType(), 4014 owntype); 4015 chk.checkLossOfPrecision(tree.rhs.pos(), operand, owntype); 4016 } 4017 result = check(tree, owntype, KindSelector.VAL, resultInfo); 4018 } 4019 4020 public void visitUnary(JCUnary tree) { 4021 // Attribute arguments. 4022 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 4023 ? attribTree(tree.arg, env, varAssignmentInfo) 4024 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 4025 4026 // Find operator. 4027 OperatorSymbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 4028 Type owntype = types.createErrorType(tree.type); 4029 if (operator != operators.noOpSymbol && 4030 !argtype.isErroneous()) { 4031 owntype = (tree.getTag().isIncOrDecUnaryOp()) 4032 ? tree.arg.type 4033 : operator.type.getReturnType(); 4034 int opc = operator.opcode; 4035 4036 // If the argument is constant, fold it. 4037 if (argtype.constValue() != null) { 4038 Type ctype = cfolder.fold1(opc, argtype); 4039 if (ctype != null) { 4040 owntype = cfolder.coerce(ctype, owntype); 4041 } 4042 } 4043 } 4044 result = check(tree, owntype, KindSelector.VAL, resultInfo); 4045 matchBindings = matchBindingsComputer.unary(tree, matchBindings); 4046 } 4047 4048 public void visitBinary(JCBinary tree) { 4049 // Attribute arguments. 4050 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 4051 // x && y 4052 // include x's bindings when true in y 4053 4054 // x || y 4055 // include x's bindings when false in y 4056 4057 MatchBindings lhsBindings = matchBindings; 4058 List<BindingSymbol> propagatedBindings; 4059 switch (tree.getTag()) { 4060 case AND: 4061 propagatedBindings = lhsBindings.bindingsWhenTrue; 4062 break; 4063 case OR: 4064 propagatedBindings = lhsBindings.bindingsWhenFalse; 4065 break; 4066 default: 4067 propagatedBindings = List.nil(); 4068 break; 4069 } 4070 Env<AttrContext> rhsEnv = bindingEnv(env, propagatedBindings); 4071 Type right; 4072 try { 4073 right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, rhsEnv)); 4074 } finally { 4075 rhsEnv.info.scope.leave(); 4076 } 4077 4078 matchBindings = matchBindingsComputer.binary(tree, lhsBindings, matchBindings); 4079 4080 // Find operator. 4081 OperatorSymbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 4082 Type owntype = types.createErrorType(tree.type); 4083 if (operator != operators.noOpSymbol && 4084 !left.isErroneous() && 4085 !right.isErroneous()) { 4086 owntype = operator.type.getReturnType(); 4087 int opc = operator.opcode; 4088 // If both arguments are constants, fold them. 4089 if (left.constValue() != null && right.constValue() != null) { 4090 Type ctype = cfolder.fold2(opc, left, right); 4091 if (ctype != null) { 4092 owntype = cfolder.coerce(ctype, owntype); 4093 } 4094 } 4095 4096 // Check that argument types of a reference ==, != are 4097 // castable to each other, (JLS 15.21). Note: unboxing 4098 // comparisons will not have an acmp* opc at this point. 4099 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 4100 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 4101 log.error(tree.pos(), Errors.IncomparableTypes(left, right)); 4102 } 4103 } 4104 4105 chk.checkDivZero(tree.rhs.pos(), operator, right); 4106 } 4107 result = check(tree, owntype, KindSelector.VAL, resultInfo); 4108 } 4109 4110 public void visitTypeCast(final JCTypeCast tree) { 4111 Type clazztype = attribType(tree.clazz, env); 4112 chk.validate(tree.clazz, env, false); 4113 //a fresh environment is required for 292 inference to work properly --- 4114 //see Infer.instantiatePolymorphicSignatureInstance() 4115 Env<AttrContext> localEnv = env.dup(tree); 4116 //should we propagate the target type? 4117 final ResultInfo castInfo; 4118 JCExpression expr = TreeInfo.skipParens(tree.expr); 4119 boolean isPoly = (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 4120 if (isPoly) { 4121 //expression is a poly - we need to propagate target type info 4122 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 4123 new Check.NestedCheckContext(resultInfo.checkContext) { 4124 @Override 4125 public boolean compatible(Type found, Type req, Warner warn) { 4126 return types.isCastable(found, req, warn); 4127 } 4128 }); 4129 } else { 4130 //standalone cast - target-type info is not propagated 4131 castInfo = unknownExprInfo; 4132 } 4133 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 4134 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 4135 if (exprtype.constValue() != null) 4136 owntype = cfolder.coerce(exprtype, owntype); 4137 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 4138 if (!isPoly) 4139 chk.checkRedundantCast(localEnv, tree); 4140 } 4141 4142 public void visitTypeTest(JCInstanceOf tree) { 4143 Type exprtype = attribExpr(tree.expr, env); 4144 if (exprtype.isPrimitive()) { 4145 preview.checkSourceLevel(tree.expr.pos(), Feature.PRIMITIVE_PATTERNS); 4146 } else { 4147 exprtype = chk.checkNullOrRefType( 4148 tree.expr.pos(), exprtype); 4149 } 4150 Type clazztype; 4151 JCTree typeTree; 4152 if (tree.pattern.getTag() == BINDINGPATTERN || 4153 tree.pattern.getTag() == RECORDPATTERN) { 4154 attribExpr(tree.pattern, env, exprtype); 4155 clazztype = tree.pattern.type; 4156 if (types.isSubtype(exprtype, clazztype) && 4157 !exprtype.isErroneous() && !clazztype.isErroneous() && 4158 tree.pattern.getTag() != RECORDPATTERN) { 4159 if (!allowUnconditionalPatternsInstanceOf) { 4160 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), 4161 Feature.UNCONDITIONAL_PATTERN_IN_INSTANCEOF.error(this.sourceName)); 4162 } 4163 } 4164 typeTree = TreeInfo.primaryPatternTypeTree((JCPattern) tree.pattern); 4165 } else { 4166 clazztype = attribType(tree.pattern, env); 4167 typeTree = tree.pattern; 4168 chk.validate(typeTree, env, false); 4169 } 4170 if (clazztype.isPrimitive()) { 4171 preview.checkSourceLevel(tree.pattern.pos(), Feature.PRIMITIVE_PATTERNS); 4172 } else { 4173 if (!clazztype.hasTag(TYPEVAR)) { 4174 clazztype = chk.checkClassOrArrayType(typeTree.pos(), clazztype); 4175 } 4176 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 4177 boolean valid = false; 4178 if (allowReifiableTypesInInstanceof) { 4179 valid = checkCastablePattern(tree.expr.pos(), exprtype, clazztype); 4180 } else { 4181 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), 4182 Feature.REIFIABLE_TYPES_INSTANCEOF.error(this.sourceName)); 4183 allowReifiableTypesInInstanceof = true; 4184 } 4185 if (!valid) { 4186 clazztype = types.createErrorType(clazztype); 4187 } 4188 } 4189 } 4190 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 4191 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 4192 } 4193 4194 private boolean checkCastablePattern(DiagnosticPosition pos, 4195 Type exprType, 4196 Type pattType) { 4197 Warner warner = new Warner(); 4198 // if any type is erroneous, the problem is reported elsewhere 4199 if (exprType.isErroneous() || pattType.isErroneous()) { 4200 return false; 4201 } 4202 if (!types.isCastable(exprType, pattType, warner)) { 4203 chk.basicHandler.report(pos, 4204 diags.fragment(Fragments.InconvertibleTypes(exprType, pattType))); 4205 return false; 4206 } else if ((exprType.isPrimitive() || pattType.isPrimitive()) && 4207 (!exprType.isPrimitive() || !pattType.isPrimitive() || !types.isSameType(exprType, pattType))) { 4208 preview.checkSourceLevel(pos, Feature.PRIMITIVE_PATTERNS); 4209 return true; 4210 } else if (warner.hasLint(LintCategory.UNCHECKED)) { 4211 log.error(pos, 4212 Errors.InstanceofReifiableNotSafe(exprType, pattType)); 4213 return false; 4214 } else { 4215 return true; 4216 } 4217 } 4218 4219 @Override 4220 public void visitAnyPattern(JCAnyPattern tree) { 4221 result = tree.type = resultInfo.pt; 4222 } 4223 4224 public void visitBindingPattern(JCBindingPattern tree) { 4225 Type type; 4226 if (tree.var.vartype != null) { 4227 type = attribType(tree.var.vartype, env); 4228 } else { 4229 type = resultInfo.pt; 4230 } 4231 tree.type = tree.var.type = type; 4232 BindingSymbol v = new BindingSymbol(tree.var.mods.flags, tree.var.name, type, env.info.scope.owner); 4233 v.pos = tree.pos; 4234 tree.var.sym = v; 4235 if (chk.checkUnique(tree.var.pos(), v, env.info.scope)) { 4236 chk.checkTransparentVar(tree.var.pos(), v, env.info.scope); 4237 } 4238 annotate.annotateLater(tree.var.mods.annotations, env, v, tree.pos()); 4239 if (!tree.var.isImplicitlyTyped()) { 4240 annotate.queueScanTreeAndTypeAnnotate(tree.var.vartype, env, v, tree.var.pos()); 4241 } 4242 annotate.flush(); 4243 chk.validate(tree.var.vartype, env, true); 4244 result = tree.type; 4245 if (v.isUnnamedVariable()) { 4246 matchBindings = MatchBindingsComputer.EMPTY; 4247 } else { 4248 matchBindings = new MatchBindings(List.of(v), List.nil()); 4249 } 4250 } 4251 4252 @Override 4253 public void visitRecordPattern(JCRecordPattern tree) { 4254 Type site; 4255 4256 if (tree.deconstructor == null) { 4257 log.error(tree.pos(), Errors.DeconstructionPatternVarNotAllowed); 4258 tree.record = syms.errSymbol; 4259 site = tree.type = types.createErrorType(tree.record.type); 4260 } else { 4261 Type type = attribType(tree.deconstructor, env); 4262 if (type.isRaw() && type.tsym.getTypeParameters().nonEmpty()) { 4263 Type inferred = infer.instantiatePatternType(resultInfo.pt, type.tsym); 4264 if (inferred == null) { 4265 log.error(tree.pos(), Errors.PatternTypeCannotInfer); 4266 } else { 4267 type = inferred; 4268 } 4269 } 4270 tree.type = tree.deconstructor.type = type; 4271 site = types.capture(tree.type); 4272 } 4273 4274 List<Type> expectedRecordTypes; 4275 if (site.tsym.kind == Kind.TYP && ((ClassSymbol) site.tsym).isRecord()) { 4276 ClassSymbol record = (ClassSymbol) site.tsym; 4277 expectedRecordTypes = record.getRecordComponents() 4278 .stream() 4279 .map(rc -> types.memberType(site, rc)) 4280 .map(t -> types.upward(t, types.captures(t)).baseType()) 4281 .collect(List.collector()); 4282 tree.record = record; 4283 } else { 4284 log.error(tree.pos(), Errors.DeconstructionPatternOnlyRecords(site.tsym)); 4285 expectedRecordTypes = Stream.generate(() -> types.createErrorType(tree.type)) 4286 .limit(tree.nested.size()) 4287 .collect(List.collector()); 4288 tree.record = syms.errSymbol; 4289 } 4290 ListBuffer<BindingSymbol> outBindings = new ListBuffer<>(); 4291 List<Type> recordTypes = expectedRecordTypes; 4292 List<JCPattern> nestedPatterns = tree.nested; 4293 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 4294 try { 4295 while (recordTypes.nonEmpty() && nestedPatterns.nonEmpty()) { 4296 attribExpr(nestedPatterns.head, localEnv, recordTypes.head); 4297 checkCastablePattern(nestedPatterns.head.pos(), recordTypes.head, nestedPatterns.head.type); 4298 outBindings.addAll(matchBindings.bindingsWhenTrue); 4299 matchBindings.bindingsWhenTrue.forEach(localEnv.info.scope::enter); 4300 nestedPatterns = nestedPatterns.tail; 4301 recordTypes = recordTypes.tail; 4302 } 4303 if (recordTypes.nonEmpty() || nestedPatterns.nonEmpty()) { 4304 while (nestedPatterns.nonEmpty()) { 4305 attribExpr(nestedPatterns.head, localEnv, Type.noType); 4306 nestedPatterns = nestedPatterns.tail; 4307 } 4308 List<Type> nestedTypes = 4309 tree.nested.stream().map(p -> p.type).collect(List.collector()); 4310 log.error(tree.pos(), 4311 Errors.IncorrectNumberOfNestedPatterns(expectedRecordTypes, 4312 nestedTypes)); 4313 } 4314 } finally { 4315 localEnv.info.scope.leave(); 4316 } 4317 chk.validate(tree.deconstructor, env, true); 4318 result = tree.type; 4319 matchBindings = new MatchBindings(outBindings.toList(), List.nil()); 4320 } 4321 4322 public void visitIndexed(JCArrayAccess tree) { 4323 Type owntype = types.createErrorType(tree.type); 4324 Type atype = attribExpr(tree.indexed, env); 4325 attribExpr(tree.index, env, syms.intType); 4326 if (types.isArray(atype)) 4327 owntype = types.elemtype(atype); 4328 else if (!atype.hasTag(ERROR)) 4329 log.error(tree.pos(), Errors.ArrayReqButFound(atype)); 4330 if (!pkind().contains(KindSelector.VAL)) 4331 owntype = capture(owntype); 4332 result = check(tree, owntype, KindSelector.VAR, resultInfo); 4333 } 4334 4335 public void visitIdent(JCIdent tree) { 4336 Symbol sym; 4337 4338 // Find symbol 4339 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 4340 // If we are looking for a method, the prototype `pt' will be a 4341 // method type with the type of the call's arguments as parameters. 4342 env.info.pendingResolutionPhase = null; 4343 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 4344 } else if (tree.sym != null && tree.sym.kind != VAR) { 4345 sym = tree.sym; 4346 } else { 4347 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 4348 } 4349 tree.sym = sym; 4350 4351 // Also find the environment current for the class where 4352 // sym is defined (`symEnv'). 4353 Env<AttrContext> symEnv = env; 4354 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 4355 sym.kind.matches(KindSelector.VAL_MTH) && 4356 sym.owner.kind == TYP && 4357 tree.name != names._this && tree.name != names._super) { 4358 4359 // Find environment in which identifier is defined. 4360 while (symEnv.outer != null && 4361 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 4362 symEnv = symEnv.outer; 4363 } 4364 } 4365 4366 // If symbol is a variable, ... 4367 if (sym.kind == VAR) { 4368 VarSymbol v = (VarSymbol)sym; 4369 4370 // ..., evaluate its initializer, if it has one, and check for 4371 // illegal forward reference. 4372 checkInit(tree, env, v, false); 4373 4374 // If we are expecting a variable (as opposed to a value), check 4375 // that the variable is assignable in the current environment. 4376 if (KindSelector.ASG.subset(pkind())) 4377 checkAssignable(tree.pos(), v, null, env); 4378 } 4379 4380 Env<AttrContext> env1 = env; 4381 if (sym.kind != ERR && sym.kind != TYP && 4382 sym.owner != null && sym.owner != env1.enclClass.sym) { 4383 // If the found symbol is inaccessible, then it is 4384 // accessed through an enclosing instance. Locate this 4385 // enclosing instance: 4386 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 4387 env1 = env1.outer; 4388 } 4389 4390 if (env.info.isSerializable) { 4391 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda); 4392 } 4393 4394 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 4395 } 4396 4397 public void visitSelect(JCFieldAccess tree) { 4398 // Determine the expected kind of the qualifier expression. 4399 KindSelector skind = KindSelector.NIL; 4400 if (tree.name == names._this || tree.name == names._super || 4401 tree.name == names._class) 4402 { 4403 skind = KindSelector.TYP; 4404 } else { 4405 if (pkind().contains(KindSelector.PCK)) 4406 skind = KindSelector.of(skind, KindSelector.PCK); 4407 if (pkind().contains(KindSelector.TYP)) 4408 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 4409 if (pkind().contains(KindSelector.VAL_MTH)) 4410 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 4411 } 4412 4413 // Attribute the qualifier expression, and determine its symbol (if any). 4414 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 4415 Assert.check(site == tree.selected.type); 4416 if (!pkind().contains(KindSelector.TYP_PCK)) 4417 site = capture(site); // Capture field access 4418 4419 // don't allow T.class T[].class, etc 4420 if (skind == KindSelector.TYP) { 4421 Type elt = site; 4422 while (elt.hasTag(ARRAY)) 4423 elt = ((ArrayType)elt).elemtype; 4424 if (elt.hasTag(TYPEVAR)) { 4425 log.error(tree.pos(), Errors.TypeVarCantBeDeref); 4426 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 4427 tree.sym = tree.type.tsym; 4428 return ; 4429 } 4430 } 4431 4432 // If qualifier symbol is a type or `super', assert `selectSuper' 4433 // for the selection. This is relevant for determining whether 4434 // protected symbols are accessible. 4435 Symbol sitesym = TreeInfo.symbol(tree.selected); 4436 boolean selectSuperPrev = env.info.selectSuper; 4437 env.info.selectSuper = 4438 sitesym != null && 4439 sitesym.name == names._super; 4440 4441 // Determine the symbol represented by the selection. 4442 env.info.pendingResolutionPhase = null; 4443 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 4444 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 4445 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym)); 4446 sym = syms.errSymbol; 4447 } 4448 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 4449 site = capture(site); 4450 sym = selectSym(tree, sitesym, site, env, resultInfo); 4451 } 4452 boolean varArgs = env.info.lastResolveVarargs(); 4453 tree.sym = sym; 4454 4455 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 4456 site = types.skipTypeVars(site, true); 4457 } 4458 4459 // If that symbol is a variable, ... 4460 if (sym.kind == VAR) { 4461 VarSymbol v = (VarSymbol)sym; 4462 4463 // ..., evaluate its initializer, if it has one, and check for 4464 // illegal forward reference. 4465 checkInit(tree, env, v, true); 4466 4467 // If we are expecting a variable (as opposed to a value), check 4468 // that the variable is assignable in the current environment. 4469 if (KindSelector.ASG.subset(pkind())) 4470 checkAssignable(tree.pos(), v, tree.selected, env); 4471 } 4472 4473 if (sitesym != null && 4474 sitesym.kind == VAR && 4475 ((VarSymbol)sitesym).isResourceVariable() && 4476 sym.kind == MTH && 4477 sym.name.equals(names.close) && 4478 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 4479 env.info.lint.isEnabled(LintCategory.TRY)) { 4480 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall); 4481 } 4482 4483 // Disallow selecting a type from an expression 4484 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 4485 tree.type = check(tree.selected, pt(), 4486 sitesym == null ? 4487 KindSelector.VAL : sitesym.kind.toSelector(), 4488 new ResultInfo(KindSelector.TYP_PCK, pt())); 4489 } 4490 4491 if (isType(sitesym)) { 4492 if (sym.name != names._this && sym.name != names._super) { 4493 // Check if type-qualified fields or methods are static (JLS) 4494 if ((sym.flags() & STATIC) == 0 && 4495 sym.name != names._super && 4496 (sym.kind == VAR || sym.kind == MTH)) { 4497 rs.accessBase(rs.new StaticError(sym), 4498 tree.pos(), site, sym.name, true); 4499 } 4500 } 4501 } else if (sym.kind != ERR && 4502 (sym.flags() & STATIC) != 0 && 4503 sym.name != names._class) { 4504 // If the qualified item is not a type and the selected item is static, report 4505 // a warning. Make allowance for the class of an array type e.g. Object[].class) 4506 if (!sym.owner.isAnonymous()) { 4507 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner)); 4508 } else { 4509 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType2(sym.kind.kindName())); 4510 } 4511 } 4512 4513 // If we are selecting an instance member via a `super', ... 4514 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 4515 4516 // Check that super-qualified symbols are not abstract (JLS) 4517 rs.checkNonAbstract(tree.pos(), sym); 4518 4519 if (site.isRaw()) { 4520 // Determine argument types for site. 4521 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 4522 if (site1 != null) site = site1; 4523 } 4524 } 4525 4526 if (env.info.isSerializable) { 4527 chk.checkAccessFromSerializableElement(tree, env.info.isSerializableLambda); 4528 } 4529 4530 env.info.selectSuper = selectSuperPrev; 4531 result = checkId(tree, site, sym, env, resultInfo); 4532 } 4533 //where 4534 /** Determine symbol referenced by a Select expression, 4535 * 4536 * @param tree The select tree. 4537 * @param site The type of the selected expression, 4538 * @param env The current environment. 4539 * @param resultInfo The current result. 4540 */ 4541 private Symbol selectSym(JCFieldAccess tree, 4542 Symbol location, 4543 Type site, 4544 Env<AttrContext> env, 4545 ResultInfo resultInfo) { 4546 DiagnosticPosition pos = tree.pos(); 4547 Name name = tree.name; 4548 switch (site.getTag()) { 4549 case PACKAGE: 4550 return rs.accessBase( 4551 rs.findIdentInPackage(pos, env, site.tsym, name, resultInfo.pkind), 4552 pos, location, site, name, true); 4553 case ARRAY: 4554 case CLASS: 4555 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 4556 return rs.resolveQualifiedMethod( 4557 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 4558 } else if (name == names._this || name == names._super) { 4559 return rs.resolveSelf(pos, env, site.tsym, name); 4560 } else if (name == names._class) { 4561 // In this case, we have already made sure in 4562 // visitSelect that qualifier expression is a type. 4563 return syms.getClassField(site, types); 4564 } else { 4565 // We are seeing a plain identifier as selector. 4566 Symbol sym = rs.findIdentInType(pos, env, site, name, resultInfo.pkind); 4567 sym = rs.accessBase(sym, pos, location, site, name, true); 4568 return sym; 4569 } 4570 case WILDCARD: 4571 throw new AssertionError(tree); 4572 case TYPEVAR: 4573 // Normally, site.getUpperBound() shouldn't be null. 4574 // It should only happen during memberEnter/attribBase 4575 // when determining the supertype which *must* be 4576 // done before attributing the type variables. In 4577 // other words, we are seeing this illegal program: 4578 // class B<T> extends A<T.foo> {} 4579 Symbol sym = (site.getUpperBound() != null) 4580 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 4581 : null; 4582 if (sym == null) { 4583 log.error(pos, Errors.TypeVarCantBeDeref); 4584 return syms.errSymbol; 4585 } else { 4586 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 4587 rs.new AccessError(env, site, sym) : 4588 sym; 4589 rs.accessBase(sym2, pos, location, site, name, true); 4590 return sym; 4591 } 4592 case ERROR: 4593 // preserve identifier names through errors 4594 return types.createErrorType(name, site.tsym, site).tsym; 4595 default: 4596 // The qualifier expression is of a primitive type -- only 4597 // .class is allowed for these. 4598 if (name == names._class) { 4599 // In this case, we have already made sure in Select that 4600 // qualifier expression is a type. 4601 return syms.getClassField(site, types); 4602 } else { 4603 log.error(pos, Errors.CantDeref(site)); 4604 return syms.errSymbol; 4605 } 4606 } 4607 } 4608 4609 /** Determine type of identifier or select expression and check that 4610 * (1) the referenced symbol is not deprecated 4611 * (2) the symbol's type is safe (@see checkSafe) 4612 * (3) if symbol is a variable, check that its type and kind are 4613 * compatible with the prototype and protokind. 4614 * (4) if symbol is an instance field of a raw type, 4615 * which is being assigned to, issue an unchecked warning if its 4616 * type changes under erasure. 4617 * (5) if symbol is an instance method of a raw type, issue an 4618 * unchecked warning if its argument types change under erasure. 4619 * If checks succeed: 4620 * If symbol is a constant, return its constant type 4621 * else if symbol is a method, return its result type 4622 * otherwise return its type. 4623 * Otherwise return errType. 4624 * 4625 * @param tree The syntax tree representing the identifier 4626 * @param site If this is a select, the type of the selected 4627 * expression, otherwise the type of the current class. 4628 * @param sym The symbol representing the identifier. 4629 * @param env The current environment. 4630 * @param resultInfo The expected result 4631 */ 4632 Type checkId(JCTree tree, 4633 Type site, 4634 Symbol sym, 4635 Env<AttrContext> env, 4636 ResultInfo resultInfo) { 4637 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 4638 checkMethodIdInternal(tree, site, sym, env, resultInfo) : 4639 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 4640 } 4641 4642 Type checkMethodIdInternal(JCTree tree, 4643 Type site, 4644 Symbol sym, 4645 Env<AttrContext> env, 4646 ResultInfo resultInfo) { 4647 if (resultInfo.pkind.contains(KindSelector.POLY)) { 4648 return attrRecover.recoverMethodInvocation(tree, site, sym, env, resultInfo); 4649 } else { 4650 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 4651 } 4652 } 4653 4654 Type checkIdInternal(JCTree tree, 4655 Type site, 4656 Symbol sym, 4657 Type pt, 4658 Env<AttrContext> env, 4659 ResultInfo resultInfo) { 4660 if (pt.isErroneous()) { 4661 return types.createErrorType(site); 4662 } 4663 Type owntype; // The computed type of this identifier occurrence. 4664 switch (sym.kind) { 4665 case TYP: 4666 // For types, the computed type equals the symbol's type, 4667 // except for two situations: 4668 owntype = sym.type; 4669 if (owntype.hasTag(CLASS)) { 4670 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 4671 Type ownOuter = owntype.getEnclosingType(); 4672 4673 // (a) If the symbol's type is parameterized, erase it 4674 // because no type parameters were given. 4675 // We recover generic outer type later in visitTypeApply. 4676 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 4677 owntype = types.erasure(owntype); 4678 } 4679 4680 // (b) If the symbol's type is an inner class, then 4681 // we have to interpret its outer type as a superclass 4682 // of the site type. Example: 4683 // 4684 // class Tree<A> { class Visitor { ... } } 4685 // class PointTree extends Tree<Point> { ... } 4686 // ...PointTree.Visitor... 4687 // 4688 // Then the type of the last expression above is 4689 // Tree<Point>.Visitor. 4690 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 4691 Type normOuter = site; 4692 if (normOuter.hasTag(CLASS)) { 4693 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 4694 } 4695 if (normOuter == null) // perhaps from an import 4696 normOuter = types.erasure(ownOuter); 4697 if (normOuter != ownOuter) 4698 owntype = new ClassType( 4699 normOuter, List.nil(), owntype.tsym, 4700 owntype.getMetadata()); 4701 } 4702 } 4703 break; 4704 case VAR: 4705 VarSymbol v = (VarSymbol)sym; 4706 4707 if (env.info.enclVar != null 4708 && v.type.hasTag(NONE)) { 4709 //self reference to implicitly typed variable declaration 4710 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef)); 4711 return tree.type = v.type = types.createErrorType(v.type); 4712 } 4713 4714 // Test (4): if symbol is an instance field of a raw type, 4715 // which is being assigned to, issue an unchecked warning if 4716 // its type changes under erasure. 4717 if (KindSelector.ASG.subset(pkind()) && 4718 v.owner.kind == TYP && 4719 (v.flags() & STATIC) == 0 && 4720 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 4721 Type s = types.asOuterSuper(site, v.owner); 4722 if (s != null && 4723 s.isRaw() && 4724 !types.isSameType(v.type, v.erasure(types))) { 4725 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s)); 4726 } 4727 } 4728 // The computed type of a variable is the type of the 4729 // variable symbol, taken as a member of the site type. 4730 owntype = (sym.owner.kind == TYP && 4731 sym.name != names._this && sym.name != names._super) 4732 ? types.memberType(site, sym) 4733 : sym.type; 4734 4735 // If the variable is a constant, record constant value in 4736 // computed type. 4737 if (v.getConstValue() != null && isStaticReference(tree)) 4738 owntype = owntype.constType(v.getConstValue()); 4739 4740 if (resultInfo.pkind == KindSelector.VAL) { 4741 owntype = capture(owntype); // capture "names as expressions" 4742 } 4743 break; 4744 case MTH: { 4745 owntype = checkMethod(site, sym, 4746 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode), 4747 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 4748 resultInfo.pt.getTypeArguments()); 4749 chk.checkRestricted(tree.pos(), sym); 4750 break; 4751 } 4752 case PCK: case ERR: 4753 owntype = sym.type; 4754 break; 4755 default: 4756 throw new AssertionError("unexpected kind: " + sym.kind + 4757 " in tree " + tree); 4758 } 4759 4760 // Emit a `deprecation' warning if symbol is deprecated. 4761 // (for constructors (but not for constructor references), the error 4762 // was given when the constructor was resolved) 4763 4764 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 4765 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 4766 chk.checkSunAPI(tree.pos(), sym); 4767 chk.checkProfile(tree.pos(), sym); 4768 chk.checkPreview(tree.pos(), env.info.scope.owner, sym); 4769 } 4770 4771 // If symbol is a variable, check that its type and 4772 // kind are compatible with the prototype and protokind. 4773 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 4774 } 4775 4776 /** Check that variable is initialized and evaluate the variable's 4777 * initializer, if not yet done. Also check that variable is not 4778 * referenced before it is defined. 4779 * @param tree The tree making up the variable reference. 4780 * @param env The current environment. 4781 * @param v The variable's symbol. 4782 */ 4783 private void checkInit(JCTree tree, 4784 Env<AttrContext> env, 4785 VarSymbol v, 4786 boolean onlyWarning) { 4787 // A forward reference is diagnosed if the declaration position 4788 // of the variable is greater than the current tree position 4789 // and the tree and variable definition occur in the same class 4790 // definition. Note that writes don't count as references. 4791 // This check applies only to class and instance 4792 // variables. Local variables follow different scope rules, 4793 // and are subject to definite assignment checking. 4794 Env<AttrContext> initEnv = enclosingInitEnv(env); 4795 if (initEnv != null && 4796 (initEnv.info.enclVar == v || v.pos > tree.pos) && 4797 v.owner.kind == TYP && 4798 v.owner == env.info.scope.owner.enclClass() && 4799 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 4800 (!env.tree.hasTag(ASSIGN) || 4801 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 4802 if (!onlyWarning || isStaticEnumField(v)) { 4803 Error errkey = (initEnv.info.enclVar == v) ? 4804 Errors.IllegalSelfRef : Errors.IllegalForwardRef; 4805 log.error(tree.pos(), errkey); 4806 } else if (useBeforeDeclarationWarning) { 4807 Warning warnkey = (initEnv.info.enclVar == v) ? 4808 Warnings.SelfRef(v) : Warnings.ForwardRef(v); 4809 log.warning(tree.pos(), warnkey); 4810 } 4811 } 4812 4813 v.getConstValue(); // ensure initializer is evaluated 4814 4815 checkEnumInitializer(tree, env, v); 4816 } 4817 4818 /** 4819 * Returns the enclosing init environment associated with this env (if any). An init env 4820 * can be either a field declaration env or a static/instance initializer env. 4821 */ 4822 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 4823 while (true) { 4824 switch (env.tree.getTag()) { 4825 case VARDEF: 4826 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 4827 if (vdecl.sym.owner.kind == TYP) { 4828 //field 4829 return env; 4830 } 4831 break; 4832 case BLOCK: 4833 if (env.next.tree.hasTag(CLASSDEF)) { 4834 //instance/static initializer 4835 return env; 4836 } 4837 break; 4838 case METHODDEF: 4839 case CLASSDEF: 4840 case TOPLEVEL: 4841 return null; 4842 } 4843 Assert.checkNonNull(env.next); 4844 env = env.next; 4845 } 4846 } 4847 4848 /** 4849 * Check for illegal references to static members of enum. In 4850 * an enum type, constructors and initializers may not 4851 * reference its static members unless they are constant. 4852 * 4853 * @param tree The tree making up the variable reference. 4854 * @param env The current environment. 4855 * @param v The variable's symbol. 4856 * @jls 8.9 Enum Types 4857 */ 4858 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 4859 // JLS: 4860 // 4861 // "It is a compile-time error to reference a static field 4862 // of an enum type that is not a compile-time constant 4863 // (15.28) from constructors, instance initializer blocks, 4864 // or instance variable initializer expressions of that 4865 // type. It is a compile-time error for the constructors, 4866 // instance initializer blocks, or instance variable 4867 // initializer expressions of an enum constant e to refer 4868 // to itself or to an enum constant of the same type that 4869 // is declared to the right of e." 4870 if (isStaticEnumField(v)) { 4871 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 4872 4873 if (enclClass == null || enclClass.owner == null) 4874 return; 4875 4876 // See if the enclosing class is the enum (or a 4877 // subclass thereof) declaring v. If not, this 4878 // reference is OK. 4879 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 4880 return; 4881 4882 // If the reference isn't from an initializer, then 4883 // the reference is OK. 4884 if (!Resolve.isInitializer(env)) 4885 return; 4886 4887 log.error(tree.pos(), Errors.IllegalEnumStaticRef); 4888 } 4889 } 4890 4891 /** Is the given symbol a static, non-constant field of an Enum? 4892 * Note: enum literals should not be regarded as such 4893 */ 4894 private boolean isStaticEnumField(VarSymbol v) { 4895 return Flags.isEnum(v.owner) && 4896 Flags.isStatic(v) && 4897 !Flags.isConstant(v) && 4898 v.name != names._class; 4899 } 4900 4901 /** 4902 * Check that method arguments conform to its instantiation. 4903 **/ 4904 public Type checkMethod(Type site, 4905 final Symbol sym, 4906 ResultInfo resultInfo, 4907 Env<AttrContext> env, 4908 final List<JCExpression> argtrees, 4909 List<Type> argtypes, 4910 List<Type> typeargtypes) { 4911 // Test (5): if symbol is an instance method of a raw type, issue 4912 // an unchecked warning if its argument types change under erasure. 4913 if ((sym.flags() & STATIC) == 0 && 4914 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 4915 Type s = types.asOuterSuper(site, sym.owner); 4916 if (s != null && s.isRaw() && 4917 !types.isSameTypes(sym.type.getParameterTypes(), 4918 sym.erasure(types).getParameterTypes())) { 4919 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s)); 4920 } 4921 } 4922 4923 if (env.info.defaultSuperCallSite != null) { 4924 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 4925 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 4926 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 4927 List<MethodSymbol> icand_sup = 4928 types.interfaceCandidates(sup, (MethodSymbol)sym); 4929 if (icand_sup.nonEmpty() && 4930 icand_sup.head != sym && 4931 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 4932 log.error(env.tree.pos(), 4933 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup))); 4934 break; 4935 } 4936 } 4937 env.info.defaultSuperCallSite = null; 4938 } 4939 4940 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 4941 JCMethodInvocation app = (JCMethodInvocation)env.tree; 4942 if (app.meth.hasTag(SELECT) && 4943 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 4944 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site)); 4945 } 4946 } 4947 4948 // Compute the identifier's instantiated type. 4949 // For methods, we need to compute the instance type by 4950 // Resolve.instantiate from the symbol's type as well as 4951 // any type arguments and value arguments. 4952 Warner noteWarner = new Warner(); 4953 try { 4954 Type owntype = rs.checkMethod( 4955 env, 4956 site, 4957 sym, 4958 resultInfo, 4959 argtypes, 4960 typeargtypes, 4961 noteWarner); 4962 4963 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap = 4964 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 4965 4966 argtypes = argtypes.map(checkDeferredMap); 4967 4968 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 4969 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym), 4970 sym.name, 4971 rs.methodArguments(sym.type.getParameterTypes()), 4972 rs.methodArguments(argtypes.map(checkDeferredMap)), 4973 kindName(sym.location()), 4974 sym.location())); 4975 if (resultInfo.pt != Infer.anyPoly || 4976 !owntype.hasTag(METHOD) || 4977 !owntype.isPartial()) { 4978 //if this is not a partially inferred method type, erase return type. Otherwise, 4979 //erasure is carried out in PartiallyInferredMethodType.check(). 4980 owntype = new MethodType(owntype.getParameterTypes(), 4981 types.erasure(owntype.getReturnType()), 4982 types.erasure(owntype.getThrownTypes()), 4983 syms.methodClass); 4984 } 4985 } 4986 4987 PolyKind pkind = (sym.type.hasTag(FORALL) && 4988 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 4989 PolyKind.POLY : PolyKind.STANDALONE; 4990 TreeInfo.setPolyKind(env.tree, pkind); 4991 4992 return (resultInfo.pt == Infer.anyPoly) ? 4993 owntype : 4994 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4995 resultInfo.checkContext.inferenceContext()); 4996 } catch (Infer.InferenceException ex) { 4997 //invalid target type - propagate exception outwards or report error 4998 //depending on the current check context 4999 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 5000 return types.createErrorType(site); 5001 } catch (Resolve.InapplicableMethodException ex) { 5002 final JCDiagnostic diag = ex.getDiagnostic(); 5003 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 5004 @Override 5005 protected Pair<Symbol, JCDiagnostic> errCandidate() { 5006 return new Pair<>(sym, diag); 5007 } 5008 }; 5009 List<Type> argtypes2 = argtypes.map( 5010 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 5011 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 5012 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 5013 log.report(errDiag); 5014 return types.createErrorType(site); 5015 } 5016 } 5017 5018 public void visitLiteral(JCLiteral tree) { 5019 result = check(tree, litType(tree.typetag).constType(tree.value), 5020 KindSelector.VAL, resultInfo); 5021 } 5022 //where 5023 /** Return the type of a literal with given type tag. 5024 */ 5025 Type litType(TypeTag tag) { 5026 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 5027 } 5028 5029 public void visitStringTemplate(JCStringTemplate tree) { 5030 JCExpression processor = tree.processor; 5031 Type processorType = attribTree(processor, env, new ResultInfo(KindSelector.VAL, Type.noType)); 5032 chk.checkProcessorType(processor, processorType, env); 5033 Type processMethodType = getProcessMethodType(tree, processorType); 5034 tree.processMethodType = processMethodType; 5035 Type resultType = processMethodType.getReturnType(); 5036 5037 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 5038 5039 for (JCExpression arg : tree.expressions) { 5040 chk.checkNonVoid(arg.pos(), attribExpr(arg, localEnv)); 5041 } 5042 5043 tree.type = resultType; 5044 result = resultType; 5045 check(tree, resultType, KindSelector.VAL, resultInfo); 5046 } 5047 5048 private Type getProcessMethodType(JCStringTemplate tree, Type processorType) { 5049 MethodSymbol processSymbol = rs.resolveInternalMethod(tree.pos(), 5050 env, types.skipTypeVars(processorType, false), 5051 names.process, List.of(syms.stringTemplateType), List.nil()); 5052 return types.memberType(processorType, processSymbol); 5053 } 5054 5055 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 5056 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 5057 } 5058 5059 public void visitTypeArray(JCArrayTypeTree tree) { 5060 Type etype = attribType(tree.elemtype, env); 5061 Type type = new ArrayType(etype, syms.arrayClass); 5062 result = check(tree, type, KindSelector.TYP, resultInfo); 5063 } 5064 5065 /** Visitor method for parameterized types. 5066 * Bound checking is left until later, since types are attributed 5067 * before supertype structure is completely known 5068 */ 5069 public void visitTypeApply(JCTypeApply tree) { 5070 Type owntype = types.createErrorType(tree.type); 5071 5072 // Attribute functor part of application and make sure it's a class. 5073 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 5074 5075 // Attribute type parameters 5076 List<Type> actuals = attribTypes(tree.arguments, env); 5077 5078 if (clazztype.hasTag(CLASS)) { 5079 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 5080 if (actuals.isEmpty()) //diamond 5081 actuals = formals; 5082 5083 if (actuals.length() == formals.length()) { 5084 List<Type> a = actuals; 5085 List<Type> f = formals; 5086 while (a.nonEmpty()) { 5087 a.head = a.head.withTypeVar(f.head); 5088 a = a.tail; 5089 f = f.tail; 5090 } 5091 // Compute the proper generic outer 5092 Type clazzOuter = clazztype.getEnclosingType(); 5093 if (clazzOuter.hasTag(CLASS)) { 5094 Type site; 5095 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 5096 if (clazz.hasTag(IDENT)) { 5097 site = env.enclClass.sym.type; 5098 } else if (clazz.hasTag(SELECT)) { 5099 site = ((JCFieldAccess) clazz).selected.type; 5100 } else throw new AssertionError(""+tree); 5101 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 5102 if (site.hasTag(CLASS)) 5103 site = types.asOuterSuper(site, clazzOuter.tsym); 5104 if (site == null) 5105 site = types.erasure(clazzOuter); 5106 clazzOuter = site; 5107 } 5108 } 5109 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 5110 clazztype.getMetadata()); 5111 } else { 5112 if (formals.length() != 0) { 5113 log.error(tree.pos(), 5114 Errors.WrongNumberTypeArgs(Integer.toString(formals.length()))); 5115 } else { 5116 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym)); 5117 } 5118 owntype = types.createErrorType(tree.type); 5119 } 5120 } 5121 result = check(tree, owntype, KindSelector.TYP, resultInfo); 5122 } 5123 5124 public void visitTypeUnion(JCTypeUnion tree) { 5125 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 5126 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 5127 for (JCExpression typeTree : tree.alternatives) { 5128 Type ctype = attribType(typeTree, env); 5129 ctype = chk.checkType(typeTree.pos(), 5130 chk.checkClassType(typeTree.pos(), ctype), 5131 syms.throwableType); 5132 if (!ctype.isErroneous()) { 5133 //check that alternatives of a union type are pairwise 5134 //unrelated w.r.t. subtyping 5135 if (chk.intersects(ctype, multicatchTypes.toList())) { 5136 for (Type t : multicatchTypes) { 5137 boolean sub = types.isSubtype(ctype, t); 5138 boolean sup = types.isSubtype(t, ctype); 5139 if (sub || sup) { 5140 //assume 'a' <: 'b' 5141 Type a = sub ? ctype : t; 5142 Type b = sub ? t : ctype; 5143 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b)); 5144 } 5145 } 5146 } 5147 multicatchTypes.append(ctype); 5148 if (all_multicatchTypes != null) 5149 all_multicatchTypes.append(ctype); 5150 } else { 5151 if (all_multicatchTypes == null) { 5152 all_multicatchTypes = new ListBuffer<>(); 5153 all_multicatchTypes.appendList(multicatchTypes); 5154 } 5155 all_multicatchTypes.append(ctype); 5156 } 5157 } 5158 Type t = check(tree, types.lub(multicatchTypes.toList()), 5159 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 5160 if (t.hasTag(CLASS)) { 5161 List<Type> alternatives = 5162 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 5163 t = new UnionClassType((ClassType) t, alternatives); 5164 } 5165 tree.type = result = t; 5166 } 5167 5168 public void visitTypeIntersection(JCTypeIntersection tree) { 5169 attribTypes(tree.bounds, env); 5170 tree.type = result = checkIntersection(tree, tree.bounds); 5171 } 5172 5173 public void visitTypeParameter(JCTypeParameter tree) { 5174 TypeVar typeVar = (TypeVar) tree.type; 5175 5176 if (tree.annotations != null && tree.annotations.nonEmpty()) { 5177 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 5178 } 5179 5180 if (!typeVar.getUpperBound().isErroneous()) { 5181 //fixup type-parameter bound computed in 'attribTypeVariables' 5182 typeVar.setUpperBound(checkIntersection(tree, tree.bounds)); 5183 } 5184 } 5185 5186 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 5187 Set<Symbol> boundSet = new HashSet<>(); 5188 if (bounds.nonEmpty()) { 5189 // accept class or interface or typevar as first bound. 5190 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 5191 boundSet.add(types.erasure(bounds.head.type).tsym); 5192 if (bounds.head.type.isErroneous()) { 5193 return bounds.head.type; 5194 } 5195 else if (bounds.head.type.hasTag(TYPEVAR)) { 5196 // if first bound was a typevar, do not accept further bounds. 5197 if (bounds.tail.nonEmpty()) { 5198 log.error(bounds.tail.head.pos(), 5199 Errors.TypeVarMayNotBeFollowedByOtherBounds); 5200 return bounds.head.type; 5201 } 5202 } else { 5203 // if first bound was a class or interface, accept only interfaces 5204 // as further bounds. 5205 for (JCExpression bound : bounds.tail) { 5206 bound.type = checkBase(bound.type, bound, env, false, true, false); 5207 if (bound.type.isErroneous()) { 5208 bounds = List.of(bound); 5209 } 5210 else if (bound.type.hasTag(CLASS)) { 5211 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 5212 } 5213 } 5214 } 5215 } 5216 5217 if (bounds.length() == 0) { 5218 return syms.objectType; 5219 } else if (bounds.length() == 1) { 5220 return bounds.head.type; 5221 } else { 5222 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 5223 // ... the variable's bound is a class type flagged COMPOUND 5224 // (see comment for TypeVar.bound). 5225 // In this case, generate a class tree that represents the 5226 // bound class, ... 5227 JCExpression extending; 5228 List<JCExpression> implementing; 5229 if (!bounds.head.type.isInterface()) { 5230 extending = bounds.head; 5231 implementing = bounds.tail; 5232 } else { 5233 extending = null; 5234 implementing = bounds; 5235 } 5236 JCClassDecl cd = make.at(tree).ClassDef( 5237 make.Modifiers(PUBLIC | ABSTRACT), 5238 names.empty, List.nil(), 5239 extending, implementing, List.nil()); 5240 5241 ClassSymbol c = (ClassSymbol)owntype.tsym; 5242 Assert.check((c.flags() & COMPOUND) != 0); 5243 cd.sym = c; 5244 c.sourcefile = env.toplevel.sourcefile; 5245 5246 // ... and attribute the bound class 5247 c.flags_field |= UNATTRIBUTED; 5248 Env<AttrContext> cenv = enter.classEnv(cd, env); 5249 typeEnvs.put(c, cenv); 5250 attribClass(c); 5251 return owntype; 5252 } 5253 } 5254 5255 public void visitWildcard(JCWildcard tree) { 5256 //- System.err.println("visitWildcard("+tree+");");//DEBUG 5257 Type type = (tree.kind.kind == BoundKind.UNBOUND) 5258 ? syms.objectType 5259 : attribType(tree.inner, env); 5260 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 5261 tree.kind.kind, 5262 syms.boundClass), 5263 KindSelector.TYP, resultInfo); 5264 } 5265 5266 public void visitAnnotation(JCAnnotation tree) { 5267 Assert.error("should be handled in annotate"); 5268 } 5269 5270 @Override 5271 public void visitModifiers(JCModifiers tree) { 5272 //error recovery only: 5273 Assert.check(resultInfo.pkind == KindSelector.ERR); 5274 5275 attribAnnotationTypes(tree.annotations, env); 5276 } 5277 5278 public void visitAnnotatedType(JCAnnotatedType tree) { 5279 attribAnnotationTypes(tree.annotations, env); 5280 Type underlyingType = attribType(tree.underlyingType, env); 5281 Type annotatedType = underlyingType.preannotatedType(); 5282 5283 if (!env.info.isNewClass) 5284 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 5285 result = tree.type = annotatedType; 5286 } 5287 5288 public void visitErroneous(JCErroneous tree) { 5289 if (tree.errs != null) { 5290 Env<AttrContext> errEnv = env.dup(env.tree, env.info.dup()); 5291 errEnv.info.returnResult = unknownExprInfo; 5292 for (JCTree err : tree.errs) 5293 attribTree(err, errEnv, new ResultInfo(KindSelector.ERR, pt())); 5294 } 5295 result = tree.type = syms.errType; 5296 } 5297 5298 /** Default visitor method for all other trees. 5299 */ 5300 public void visitTree(JCTree tree) { 5301 throw new AssertionError(); 5302 } 5303 5304 /** 5305 * Attribute an env for either a top level tree or class or module declaration. 5306 */ 5307 public void attrib(Env<AttrContext> env) { 5308 switch (env.tree.getTag()) { 5309 case MODULEDEF: 5310 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 5311 break; 5312 case PACKAGEDEF: 5313 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge); 5314 break; 5315 default: 5316 attribClass(env.tree.pos(), env.enclClass.sym); 5317 } 5318 } 5319 5320 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) { 5321 try { 5322 annotate.flush(); 5323 attribPackage(p); 5324 } catch (CompletionFailure ex) { 5325 chk.completionError(pos, ex); 5326 } 5327 } 5328 5329 void attribPackage(PackageSymbol p) { 5330 attribWithLint(p, 5331 env -> chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p)); 5332 } 5333 5334 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 5335 try { 5336 annotate.flush(); 5337 attribModule(m); 5338 } catch (CompletionFailure ex) { 5339 chk.completionError(pos, ex); 5340 } 5341 } 5342 5343 void attribModule(ModuleSymbol m) { 5344 attribWithLint(m, env -> attribStat(env.tree, env)); 5345 } 5346 5347 private void attribWithLint(TypeSymbol sym, Consumer<Env<AttrContext>> attrib) { 5348 Env<AttrContext> env = typeEnvs.get(sym); 5349 5350 Env<AttrContext> lintEnv = env; 5351 while (lintEnv.info.lint == null) 5352 lintEnv = lintEnv.next; 5353 5354 Lint lint = lintEnv.info.lint.augment(sym); 5355 5356 Lint prevLint = chk.setLint(lint); 5357 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 5358 5359 try { 5360 deferredLintHandler.flush(env.tree.pos()); 5361 attrib.accept(env); 5362 } finally { 5363 log.useSource(prev); 5364 chk.setLint(prevLint); 5365 } 5366 } 5367 5368 /** Main method: attribute class definition associated with given class symbol. 5369 * reporting completion failures at the given position. 5370 * @param pos The source position at which completion errors are to be 5371 * reported. 5372 * @param c The class symbol whose definition will be attributed. 5373 */ 5374 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 5375 try { 5376 annotate.flush(); 5377 attribClass(c); 5378 } catch (CompletionFailure ex) { 5379 chk.completionError(pos, ex); 5380 } 5381 } 5382 5383 /** Attribute class definition associated with given class symbol. 5384 * @param c The class symbol whose definition will be attributed. 5385 */ 5386 void attribClass(ClassSymbol c) throws CompletionFailure { 5387 if (c.type.hasTag(ERROR)) return; 5388 5389 // Check for cycles in the inheritance graph, which can arise from 5390 // ill-formed class files. 5391 chk.checkNonCyclic(null, c.type); 5392 5393 Type st = types.supertype(c.type); 5394 if ((c.flags_field & Flags.COMPOUND) == 0 && 5395 (c.flags_field & Flags.SUPER_OWNER_ATTRIBUTED) == 0) { 5396 // First, attribute superclass. 5397 if (st.hasTag(CLASS)) 5398 attribClass((ClassSymbol)st.tsym); 5399 5400 // Next attribute owner, if it is a class. 5401 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 5402 attribClass((ClassSymbol)c.owner); 5403 5404 c.flags_field |= Flags.SUPER_OWNER_ATTRIBUTED; 5405 } 5406 5407 // The previous operations might have attributed the current class 5408 // if there was a cycle. So we test first whether the class is still 5409 // UNATTRIBUTED. 5410 if ((c.flags_field & UNATTRIBUTED) != 0) { 5411 c.flags_field &= ~UNATTRIBUTED; 5412 5413 // Get environment current at the point of class definition. 5414 Env<AttrContext> env = typeEnvs.get(c); 5415 5416 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 5417 // because the annotations were not available at the time the env was created. Therefore, 5418 // we look up the environment chain for the first enclosing environment for which the 5419 // lint value is set. Typically, this is the parent env, but might be further if there 5420 // are any envs created as a result of TypeParameter nodes. 5421 Env<AttrContext> lintEnv = env; 5422 while (lintEnv.info.lint == null) 5423 lintEnv = lintEnv.next; 5424 5425 // Having found the enclosing lint value, we can initialize the lint value for this class 5426 env.info.lint = lintEnv.info.lint.augment(c); 5427 5428 Lint prevLint = chk.setLint(env.info.lint); 5429 JavaFileObject prev = log.useSource(c.sourcefile); 5430 ResultInfo prevReturnRes = env.info.returnResult; 5431 5432 try { 5433 if (c.isSealed() && 5434 !c.isEnum() && 5435 !c.isPermittedExplicit && 5436 c.getPermittedSubclasses().isEmpty()) { 5437 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.SealedClassMustHaveSubclasses); 5438 } 5439 5440 if (c.isSealed()) { 5441 Set<Symbol> permittedTypes = new HashSet<>(); 5442 boolean sealedInUnnamed = c.packge().modle == syms.unnamedModule || c.packge().modle == syms.noModule; 5443 for (Type subType : c.getPermittedSubclasses()) { 5444 boolean isTypeVar = false; 5445 if (subType.getTag() == TYPEVAR) { 5446 isTypeVar = true; //error recovery 5447 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), 5448 Errors.InvalidPermitsClause(Fragments.IsATypeVariable(subType))); 5449 } 5450 if (subType.tsym.isAnonymous() && !c.isEnum()) { 5451 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), Errors.LocalClassesCantExtendSealed(Fragments.Anonymous)); 5452 } 5453 if (permittedTypes.contains(subType.tsym)) { 5454 DiagnosticPosition pos = 5455 env.enclClass.permitting.stream() 5456 .filter(permittedExpr -> TreeInfo.diagnosticPositionFor(subType.tsym, permittedExpr, true) != null) 5457 .limit(2).collect(List.collector()).get(1); 5458 log.error(pos, Errors.InvalidPermitsClause(Fragments.IsDuplicated(subType))); 5459 } else { 5460 permittedTypes.add(subType.tsym); 5461 } 5462 if (sealedInUnnamed) { 5463 if (subType.tsym.packge() != c.packge()) { 5464 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), 5465 Errors.ClassInUnnamedModuleCantExtendSealedInDiffPackage(c) 5466 ); 5467 } 5468 } else if (subType.tsym.packge().modle != c.packge().modle) { 5469 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), 5470 Errors.ClassInModuleCantExtendSealedInDiffModule(c, c.packge().modle) 5471 ); 5472 } 5473 if (subType.tsym == c.type.tsym || types.isSuperType(subType, c.type)) { 5474 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, ((JCClassDecl)env.tree).permitting), 5475 Errors.InvalidPermitsClause( 5476 subType.tsym == c.type.tsym ? 5477 Fragments.MustNotBeSameClass : 5478 Fragments.MustNotBeSupertype(subType) 5479 ) 5480 ); 5481 } else if (!isTypeVar) { 5482 boolean thisIsASuper = types.directSupertypes(subType) 5483 .stream() 5484 .anyMatch(d -> d.tsym == c); 5485 if (!thisIsASuper) { 5486 log.error(TreeInfo.diagnosticPositionFor(subType.tsym, env.tree), 5487 Errors.InvalidPermitsClause(Fragments.DoesntExtendSealed(subType))); 5488 } 5489 } 5490 } 5491 } 5492 5493 List<ClassSymbol> sealedSupers = types.directSupertypes(c.type) 5494 .stream() 5495 .filter(s -> s.tsym.isSealed()) 5496 .map(s -> (ClassSymbol) s.tsym) 5497 .collect(List.collector()); 5498 5499 if (sealedSupers.isEmpty()) { 5500 if ((c.flags_field & Flags.NON_SEALED) != 0) { 5501 boolean hasErrorSuper = false; 5502 5503 hasErrorSuper |= types.directSupertypes(c.type) 5504 .stream() 5505 .anyMatch(s -> s.tsym.kind == Kind.ERR); 5506 5507 ClassType ct = (ClassType) c.type; 5508 5509 hasErrorSuper |= !ct.isCompound() && ct.interfaces_field != ct.all_interfaces_field; 5510 5511 if (!hasErrorSuper) { 5512 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.NonSealedWithNoSealedSupertype(c)); 5513 } 5514 } 5515 } else if ((c.flags_field & Flags.COMPOUND) == 0) { 5516 if (c.isDirectlyOrIndirectlyLocal() && !c.isEnum()) { 5517 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), Errors.LocalClassesCantExtendSealed(c.isAnonymous() ? Fragments.Anonymous : Fragments.Local)); 5518 } 5519 5520 if (!c.type.isCompound()) { 5521 for (ClassSymbol supertypeSym : sealedSupers) { 5522 if (!supertypeSym.isPermittedSubclass(c.type.tsym)) { 5523 log.error(TreeInfo.diagnosticPositionFor(c.type.tsym, env.tree), Errors.CantInheritFromSealed(supertypeSym)); 5524 } 5525 } 5526 if (!c.isNonSealed() && !c.isFinal() && !c.isSealed()) { 5527 log.error(TreeInfo.diagnosticPositionFor(c, env.tree), 5528 c.isInterface() ? 5529 Errors.NonSealedOrSealedExpected : 5530 Errors.NonSealedSealedOrFinalExpected); 5531 } 5532 } 5533 } 5534 5535 deferredLintHandler.flush(env.tree); 5536 env.info.returnResult = null; 5537 // java.lang.Enum may not be subclassed by a non-enum 5538 if (st.tsym == syms.enumSym && 5539 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 5540 log.error(env.tree.pos(), Errors.EnumNoSubclassing); 5541 5542 // Enums may not be extended by source-level classes 5543 if (st.tsym != null && 5544 ((st.tsym.flags_field & Flags.ENUM) != 0) && 5545 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 5546 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible); 5547 } 5548 5549 if (rs.isSerializable(c.type)) { 5550 env.info.isSerializable = true; 5551 } 5552 5553 if (c.isValueClass()) { 5554 Assert.check(env.tree.hasTag(CLASSDEF)); 5555 chk.checkConstraintsOfValueClass((JCClassDecl) env.tree, c); 5556 } 5557 5558 attribClassBody(env, c); 5559 5560 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 5561 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 5562 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 5563 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree); 5564 5565 if (c.isImplicit()) { 5566 chk.checkHasMain(env.tree.pos(), c); 5567 } 5568 } finally { 5569 env.info.returnResult = prevReturnRes; 5570 log.useSource(prev); 5571 chk.setLint(prevLint); 5572 } 5573 5574 } 5575 } 5576 5577 public void visitImport(JCImport tree) { 5578 // nothing to do 5579 } 5580 5581 public void visitModuleDef(JCModuleDecl tree) { 5582 tree.sym.completeUsesProvides(); 5583 ModuleSymbol msym = tree.sym; 5584 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym); 5585 Lint prevLint = chk.setLint(lint); 5586 chk.checkModuleName(tree); 5587 chk.checkDeprecatedAnnotation(tree, msym); 5588 5589 try { 5590 deferredLintHandler.flush(tree.pos()); 5591 } finally { 5592 chk.setLint(prevLint); 5593 } 5594 } 5595 5596 /** Finish the attribution of a class. */ 5597 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 5598 JCClassDecl tree = (JCClassDecl)env.tree; 5599 Assert.check(c == tree.sym); 5600 5601 // Validate type parameters, supertype and interfaces. 5602 attribStats(tree.typarams, env); 5603 if (!c.isAnonymous()) { 5604 //already checked if anonymous 5605 chk.validate(tree.typarams, env); 5606 chk.validate(tree.extending, env); 5607 chk.validate(tree.implementing, env); 5608 } 5609 5610 c.markAbstractIfNeeded(types); 5611 5612 // If this is a non-abstract class, check that it has no abstract 5613 // methods or unimplemented methods of an implemented interface. 5614 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 5615 chk.checkAllDefined(tree.pos(), c); 5616 } 5617 5618 if ((c.flags() & ANNOTATION) != 0) { 5619 if (tree.implementing.nonEmpty()) 5620 log.error(tree.implementing.head.pos(), 5621 Errors.CantExtendIntfAnnotation); 5622 if (tree.typarams.nonEmpty()) { 5623 log.error(tree.typarams.head.pos(), 5624 Errors.IntfAnnotationCantHaveTypeParams(c)); 5625 } 5626 5627 // If this annotation type has a @Repeatable, validate 5628 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 5629 // If this annotation type has a @Repeatable, validate 5630 if (repeatable != null) { 5631 // get diagnostic position for error reporting 5632 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 5633 Assert.checkNonNull(cbPos); 5634 5635 chk.validateRepeatable(c, repeatable, cbPos); 5636 } 5637 } else { 5638 // Check that all extended classes and interfaces 5639 // are compatible (i.e. no two define methods with same arguments 5640 // yet different return types). (JLS 8.4.8.3) 5641 chk.checkCompatibleSupertypes(tree.pos(), c.type); 5642 chk.checkDefaultMethodClashes(tree.pos(), c.type); 5643 chk.checkPotentiallyAmbiguousOverloads(tree, c.type); 5644 } 5645 5646 // Check that class does not import the same parameterized interface 5647 // with two different argument lists. 5648 chk.checkClassBounds(tree.pos(), c.type); 5649 5650 tree.type = c.type; 5651 5652 for (List<JCTypeParameter> l = tree.typarams; 5653 l.nonEmpty(); l = l.tail) { 5654 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 5655 } 5656 5657 // Check that a generic class doesn't extend Throwable 5658 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 5659 log.error(tree.extending.pos(), Errors.GenericThrowable); 5660 5661 // Check that all methods which implement some 5662 // method conform to the method they implement. 5663 chk.checkImplementations(tree); 5664 5665 //check that a resource implementing AutoCloseable cannot throw InterruptedException 5666 checkAutoCloseable(tree.pos(), env, c.type); 5667 5668 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 5669 // Attribute declaration 5670 attribStat(l.head, env); 5671 // Check that declarations in inner classes are not static (JLS 8.1.2) 5672 // Make an exception for static constants. 5673 if (!allowRecords && 5674 c.owner.kind != PCK && 5675 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 5676 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 5677 VarSymbol sym = null; 5678 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 5679 if (sym == null || 5680 sym.kind != VAR || 5681 sym.getConstValue() == null) 5682 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c)); 5683 } 5684 } 5685 5686 // Check for proper placement of super()/this() calls. 5687 chk.checkSuperInitCalls(tree); 5688 5689 // Check for cycles among non-initial constructors. 5690 chk.checkCyclicConstructors(tree); 5691 5692 // Check for cycles among annotation elements. 5693 chk.checkNonCyclicElements(tree); 5694 5695 // Check for proper use of serialVersionUID and other 5696 // serialization-related fields and methods 5697 if (env.info.lint.isEnabled(LintCategory.SERIAL) 5698 && rs.isSerializable(c.type) 5699 && !c.isAnonymous()) { 5700 chk.checkSerialStructure(env, tree, c); 5701 } 5702 // Correctly organize the positions of the type annotations 5703 typeAnnotations.organizeTypeAnnotationsBodies(tree); 5704 5705 // Check type annotations applicability rules 5706 validateTypeAnnotations(tree, false); 5707 } 5708 // where 5709 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 5710 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 5711 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 5712 if (types.isSameType(al.head.annotationType.type, t)) 5713 return al.head.pos(); 5714 } 5715 5716 return null; 5717 } 5718 5719 private Type capture(Type type) { 5720 return types.capture(type); 5721 } 5722 5723 private void setSyntheticVariableType(JCVariableDecl tree, Type type) { 5724 if (type.isErroneous()) { 5725 tree.vartype = make.at(Position.NOPOS).Erroneous(); 5726 } else { 5727 tree.vartype = make.at(Position.NOPOS).Type(type); 5728 } 5729 } 5730 5731 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 5732 tree.accept(new TypeAnnotationsValidator(sigOnly)); 5733 } 5734 //where 5735 private final class TypeAnnotationsValidator extends TreeScanner { 5736 5737 private final boolean sigOnly; 5738 public TypeAnnotationsValidator(boolean sigOnly) { 5739 this.sigOnly = sigOnly; 5740 } 5741 5742 public void visitAnnotation(JCAnnotation tree) { 5743 chk.validateTypeAnnotation(tree, null, false); 5744 super.visitAnnotation(tree); 5745 } 5746 public void visitAnnotatedType(JCAnnotatedType tree) { 5747 if (!tree.underlyingType.type.isErroneous()) { 5748 super.visitAnnotatedType(tree); 5749 } 5750 } 5751 public void visitTypeParameter(JCTypeParameter tree) { 5752 chk.validateTypeAnnotations(tree.annotations, tree.type.tsym, true); 5753 scan(tree.bounds); 5754 // Don't call super. 5755 // This is needed because above we call validateTypeAnnotation with 5756 // false, which would forbid annotations on type parameters. 5757 // super.visitTypeParameter(tree); 5758 } 5759 public void visitMethodDef(JCMethodDecl tree) { 5760 if (tree.recvparam != null && 5761 !tree.recvparam.vartype.type.isErroneous()) { 5762 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, tree.recvparam.sym); 5763 } 5764 if (tree.restype != null && tree.restype.type != null) { 5765 validateAnnotatedType(tree.restype, tree.restype.type); 5766 } 5767 if (sigOnly) { 5768 scan(tree.mods); 5769 scan(tree.restype); 5770 scan(tree.typarams); 5771 scan(tree.recvparam); 5772 scan(tree.params); 5773 scan(tree.thrown); 5774 } else { 5775 scan(tree.defaultValue); 5776 scan(tree.body); 5777 } 5778 } 5779 public void visitVarDef(final JCVariableDecl tree) { 5780 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 5781 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped()) 5782 validateAnnotatedType(tree.vartype, tree.sym.type); 5783 scan(tree.mods); 5784 scan(tree.vartype); 5785 if (!sigOnly) { 5786 scan(tree.init); 5787 } 5788 } 5789 public void visitTypeCast(JCTypeCast tree) { 5790 if (tree.clazz != null && tree.clazz.type != null) 5791 validateAnnotatedType(tree.clazz, tree.clazz.type); 5792 super.visitTypeCast(tree); 5793 } 5794 public void visitTypeTest(JCInstanceOf tree) { 5795 if (tree.pattern != null && !(tree.pattern instanceof JCPattern) && tree.pattern.type != null) 5796 validateAnnotatedType(tree.pattern, tree.pattern.type); 5797 super.visitTypeTest(tree); 5798 } 5799 public void visitNewClass(JCNewClass tree) { 5800 if (tree.clazz != null && tree.clazz.type != null) { 5801 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 5802 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 5803 tree.clazz.type.tsym); 5804 } 5805 if (tree.def != null) { 5806 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 5807 } 5808 5809 validateAnnotatedType(tree.clazz, tree.clazz.type); 5810 } 5811 super.visitNewClass(tree); 5812 } 5813 public void visitNewArray(JCNewArray tree) { 5814 if (tree.elemtype != null && tree.elemtype.type != null) { 5815 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 5816 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 5817 tree.elemtype.type.tsym); 5818 } 5819 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 5820 } 5821 super.visitNewArray(tree); 5822 } 5823 public void visitClassDef(JCClassDecl tree) { 5824 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 5825 if (sigOnly) { 5826 scan(tree.mods); 5827 scan(tree.typarams); 5828 scan(tree.extending); 5829 scan(tree.implementing); 5830 } 5831 for (JCTree member : tree.defs) { 5832 if (member.hasTag(Tag.CLASSDEF)) { 5833 continue; 5834 } 5835 scan(member); 5836 } 5837 } 5838 public void visitBlock(JCBlock tree) { 5839 if (!sigOnly) { 5840 scan(tree.stats); 5841 } 5842 } 5843 5844 /* I would want to model this after 5845 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 5846 * and override visitSelect and visitTypeApply. 5847 * However, we only set the annotated type in the top-level type 5848 * of the symbol. 5849 * Therefore, we need to override each individual location where a type 5850 * can occur. 5851 */ 5852 private void validateAnnotatedType(final JCTree errtree, final Type type) { 5853 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 5854 5855 if (type.isPrimitiveOrVoid()) { 5856 return; 5857 } 5858 5859 JCTree enclTr = errtree; 5860 Type enclTy = type; 5861 5862 boolean repeat = true; 5863 while (repeat) { 5864 if (enclTr.hasTag(TYPEAPPLY)) { 5865 List<Type> tyargs = enclTy.getTypeArguments(); 5866 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 5867 if (trargs.length() > 0) { 5868 // Nothing to do for diamonds 5869 if (tyargs.length() == trargs.length()) { 5870 for (int i = 0; i < tyargs.length(); ++i) { 5871 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 5872 } 5873 } 5874 // If the lengths don't match, it's either a diamond 5875 // or some nested type that redundantly provides 5876 // type arguments in the tree. 5877 } 5878 5879 // Look at the clazz part of a generic type 5880 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 5881 } 5882 5883 if (enclTr.hasTag(SELECT)) { 5884 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 5885 if (enclTy != null && 5886 !enclTy.hasTag(NONE)) { 5887 enclTy = enclTy.getEnclosingType(); 5888 } 5889 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 5890 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 5891 if (enclTy == null || enclTy.hasTag(NONE)) { 5892 if (at.getAnnotations().size() == 1) { 5893 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute)); 5894 } else { 5895 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 5896 for (JCAnnotation an : at.getAnnotations()) { 5897 comps.add(an.attribute); 5898 } 5899 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList())); 5900 } 5901 repeat = false; 5902 } 5903 enclTr = at.underlyingType; 5904 // enclTy doesn't need to be changed 5905 } else if (enclTr.hasTag(IDENT)) { 5906 repeat = false; 5907 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 5908 JCWildcard wc = (JCWildcard) enclTr; 5909 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD || 5910 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 5911 validateAnnotatedType(wc.getBound(), wc.getBound().type); 5912 } else { 5913 // Nothing to do for UNBOUND 5914 } 5915 repeat = false; 5916 } else if (enclTr.hasTag(TYPEARRAY)) { 5917 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 5918 validateAnnotatedType(art.getType(), art.elemtype.type); 5919 repeat = false; 5920 } else if (enclTr.hasTag(TYPEUNION)) { 5921 JCTypeUnion ut = (JCTypeUnion) enclTr; 5922 for (JCTree t : ut.getTypeAlternatives()) { 5923 validateAnnotatedType(t, t.type); 5924 } 5925 repeat = false; 5926 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 5927 JCTypeIntersection it = (JCTypeIntersection) enclTr; 5928 for (JCTree t : it.getBounds()) { 5929 validateAnnotatedType(t, t.type); 5930 } 5931 repeat = false; 5932 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 5933 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 5934 repeat = false; 5935 } else { 5936 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 5937 " within: "+ errtree + " with kind: " + errtree.getKind()); 5938 } 5939 } 5940 } 5941 5942 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 5943 Symbol sym) { 5944 // Ensure that no declaration annotations are present. 5945 // Note that a tree type might be an AnnotatedType with 5946 // empty annotations, if only declaration annotations were given. 5947 // This method will raise an error for such a type. 5948 for (JCAnnotation ai : annotations) { 5949 if (!ai.type.isErroneous() && 5950 typeAnnotations.annotationTargetType(ai, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 5951 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 5952 } 5953 } 5954 } 5955 } 5956 5957 // <editor-fold desc="post-attribution visitor"> 5958 5959 /** 5960 * Handle missing types/symbols in an AST. This routine is useful when 5961 * the compiler has encountered some errors (which might have ended up 5962 * terminating attribution abruptly); if the compiler is used in fail-over 5963 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 5964 * prevents NPE to be propagated during subsequent compilation steps. 5965 */ 5966 public void postAttr(JCTree tree) { 5967 new PostAttrAnalyzer().scan(tree); 5968 } 5969 5970 class PostAttrAnalyzer extends TreeScanner { 5971 5972 private void initTypeIfNeeded(JCTree that) { 5973 if (that.type == null) { 5974 if (that.hasTag(METHODDEF)) { 5975 that.type = dummyMethodType((JCMethodDecl)that); 5976 } else { 5977 that.type = syms.unknownType; 5978 } 5979 } 5980 } 5981 5982 /* Construct a dummy method type. If we have a method declaration, 5983 * and the declared return type is void, then use that return type 5984 * instead of UNKNOWN to avoid spurious error messages in lambda 5985 * bodies (see:JDK-8041704). 5986 */ 5987 private Type dummyMethodType(JCMethodDecl md) { 5988 Type restype = syms.unknownType; 5989 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) { 5990 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 5991 if (prim.typetag == VOID) 5992 restype = syms.voidType; 5993 } 5994 return new MethodType(List.nil(), restype, 5995 List.nil(), syms.methodClass); 5996 } 5997 private Type dummyMethodType() { 5998 return dummyMethodType(null); 5999 } 6000 6001 @Override 6002 public void scan(JCTree tree) { 6003 if (tree == null) return; 6004 if (tree instanceof JCExpression) { 6005 initTypeIfNeeded(tree); 6006 } 6007 super.scan(tree); 6008 } 6009 6010 @Override 6011 public void visitIdent(JCIdent that) { 6012 if (that.sym == null) { 6013 that.sym = syms.unknownSymbol; 6014 } 6015 } 6016 6017 @Override 6018 public void visitSelect(JCFieldAccess that) { 6019 if (that.sym == null) { 6020 that.sym = syms.unknownSymbol; 6021 } 6022 super.visitSelect(that); 6023 } 6024 6025 @Override 6026 public void visitClassDef(JCClassDecl that) { 6027 initTypeIfNeeded(that); 6028 if (that.sym == null) { 6029 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 6030 } 6031 super.visitClassDef(that); 6032 } 6033 6034 @Override 6035 public void visitMethodDef(JCMethodDecl that) { 6036 initTypeIfNeeded(that); 6037 if (that.sym == null) { 6038 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 6039 } 6040 super.visitMethodDef(that); 6041 } 6042 6043 @Override 6044 public void visitVarDef(JCVariableDecl that) { 6045 initTypeIfNeeded(that); 6046 if (that.sym == null) { 6047 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 6048 that.sym.adr = 0; 6049 } 6050 if (that.vartype == null) { 6051 that.vartype = make.at(Position.NOPOS).Erroneous(); 6052 } 6053 super.visitVarDef(that); 6054 } 6055 6056 @Override 6057 public void visitBindingPattern(JCBindingPattern that) { 6058 initTypeIfNeeded(that); 6059 initTypeIfNeeded(that.var); 6060 if (that.var.sym == null) { 6061 that.var.sym = new BindingSymbol(0, that.var.name, that.var.type, syms.noSymbol); 6062 that.var.sym.adr = 0; 6063 } 6064 super.visitBindingPattern(that); 6065 } 6066 6067 @Override 6068 public void visitNewClass(JCNewClass that) { 6069 if (that.constructor == null) { 6070 that.constructor = new MethodSymbol(0, names.init, 6071 dummyMethodType(), syms.noSymbol); 6072 } 6073 if (that.constructorType == null) { 6074 that.constructorType = syms.unknownType; 6075 } 6076 super.visitNewClass(that); 6077 } 6078 6079 @Override 6080 public void visitAssignop(JCAssignOp that) { 6081 if (that.operator == null) { 6082 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 6083 -1, syms.noSymbol); 6084 } 6085 super.visitAssignop(that); 6086 } 6087 6088 @Override 6089 public void visitBinary(JCBinary that) { 6090 if (that.operator == null) { 6091 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 6092 -1, syms.noSymbol); 6093 } 6094 super.visitBinary(that); 6095 } 6096 6097 @Override 6098 public void visitUnary(JCUnary that) { 6099 if (that.operator == null) { 6100 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 6101 -1, syms.noSymbol); 6102 } 6103 super.visitUnary(that); 6104 } 6105 6106 @Override 6107 public void visitReference(JCMemberReference that) { 6108 super.visitReference(that); 6109 if (that.sym == null) { 6110 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 6111 syms.noSymbol); 6112 } 6113 } 6114 } 6115 // </editor-fold> 6116 6117 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 6118 new TreeScanner() { 6119 Symbol packge = pkg; 6120 @Override 6121 public void visitIdent(JCIdent that) { 6122 that.sym = packge; 6123 } 6124 6125 @Override 6126 public void visitSelect(JCFieldAccess that) { 6127 that.sym = packge; 6128 packge = packge.owner; 6129 super.visitSelect(that); 6130 } 6131 }.scan(pid); 6132 } 6133 6134 }