Attr.java revision 3066:820841f0e8bd
1/* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.*; 29 30import javax.lang.model.element.ElementKind; 31import javax.tools.JavaFileObject; 32 33import com.sun.source.tree.IdentifierTree; 34import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 35import com.sun.source.tree.MemberSelectTree; 36import com.sun.source.tree.TreeVisitor; 37import com.sun.source.util.SimpleTreeVisitor; 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Lint.LintCategory; 40import com.sun.tools.javac.code.Scope.WriteableScope; 41import com.sun.tools.javac.code.Symbol.*; 42import com.sun.tools.javac.code.Type.*; 43import com.sun.tools.javac.code.TypeMetadata.Annotations; 44import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 45import com.sun.tools.javac.comp.Check.CheckContext; 46import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 47import com.sun.tools.javac.comp.Infer.FreeTypeListener; 48import com.sun.tools.javac.jvm.*; 49import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 50import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 51import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 52import com.sun.tools.javac.resources.CompilerProperties.Errors; 53import com.sun.tools.javac.resources.CompilerProperties.Fragments; 54import com.sun.tools.javac.tree.*; 55import com.sun.tools.javac.tree.JCTree.*; 56import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 57import com.sun.tools.javac.util.*; 58import com.sun.tools.javac.util.DefinedBy.Api; 59import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 60import com.sun.tools.javac.util.JCDiagnostic.Fragment; 61import com.sun.tools.javac.util.List; 62import static com.sun.tools.javac.code.Flags.*; 63import static com.sun.tools.javac.code.Flags.ANNOTATION; 64import static com.sun.tools.javac.code.Flags.BLOCK; 65import static com.sun.tools.javac.code.Kinds.*; 66import static com.sun.tools.javac.code.Kinds.Kind.*; 67import static com.sun.tools.javac.code.TypeTag.*; 68import static com.sun.tools.javac.code.TypeTag.WILDCARD; 69import static com.sun.tools.javac.tree.JCTree.Tag.*; 70 71/** This is the main context-dependent analysis phase in GJC. It 72 * encompasses name resolution, type checking and constant folding as 73 * subtasks. Some subtasks involve auxiliary classes. 74 * @see Check 75 * @see Resolve 76 * @see ConstFold 77 * @see Infer 78 * 79 * <p><b>This is NOT part of any supported API. 80 * If you write code that depends on this, you do so at your own risk. 81 * This code and its internal interfaces are subject to change or 82 * deletion without notice.</b> 83 */ 84public class Attr extends JCTree.Visitor { 85 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 86 87 final Names names; 88 final Log log; 89 final Symtab syms; 90 final Resolve rs; 91 final Operators operators; 92 final Infer infer; 93 final Analyzer analyzer; 94 final DeferredAttr deferredAttr; 95 final Check chk; 96 final Flow flow; 97 final MemberEnter memberEnter; 98 final TypeEnter typeEnter; 99 final TreeMaker make; 100 final ConstFold cfolder; 101 final Enter enter; 102 final Target target; 103 final Types types; 104 final JCDiagnostic.Factory diags; 105 final TypeAnnotations typeAnnotations; 106 final DeferredLintHandler deferredLintHandler; 107 final TypeEnvs typeEnvs; 108 final Dependencies dependencies; 109 final Annotate annotate; 110 final ArgumentAttr argumentAttr; 111 112 public static Attr instance(Context context) { 113 Attr instance = context.get(attrKey); 114 if (instance == null) 115 instance = new Attr(context); 116 return instance; 117 } 118 119 protected Attr(Context context) { 120 context.put(attrKey, this); 121 122 names = Names.instance(context); 123 log = Log.instance(context); 124 syms = Symtab.instance(context); 125 rs = Resolve.instance(context); 126 operators = Operators.instance(context); 127 chk = Check.instance(context); 128 flow = Flow.instance(context); 129 memberEnter = MemberEnter.instance(context); 130 typeEnter = TypeEnter.instance(context); 131 make = TreeMaker.instance(context); 132 enter = Enter.instance(context); 133 infer = Infer.instance(context); 134 analyzer = Analyzer.instance(context); 135 deferredAttr = DeferredAttr.instance(context); 136 cfolder = ConstFold.instance(context); 137 target = Target.instance(context); 138 types = Types.instance(context); 139 diags = JCDiagnostic.Factory.instance(context); 140 annotate = Annotate.instance(context); 141 typeAnnotations = TypeAnnotations.instance(context); 142 deferredLintHandler = DeferredLintHandler.instance(context); 143 typeEnvs = TypeEnvs.instance(context); 144 dependencies = Dependencies.instance(context); 145 argumentAttr = ArgumentAttr.instance(context); 146 147 Options options = Options.instance(context); 148 149 Source source = Source.instance(context); 150 allowStringsInSwitch = source.allowStringsInSwitch(); 151 allowPoly = source.allowPoly(); 152 allowTypeAnnos = source.allowTypeAnnotations(); 153 allowLambda = source.allowLambda(); 154 allowDefaultMethods = source.allowDefaultMethods(); 155 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 156 sourceName = source.name; 157 relax = (options.isSet("-retrofit") || 158 options.isSet("-relax")); 159 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 160 161 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 162 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 163 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 164 methodAttrInfo = new MethodAttrInfo(); 165 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 166 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 167 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 168 } 169 170 /** Switch: relax some constraints for retrofit mode. 171 */ 172 boolean relax; 173 174 /** Switch: support target-typing inference 175 */ 176 boolean allowPoly; 177 178 /** Switch: support type annotations. 179 */ 180 boolean allowTypeAnnos; 181 182 /** Switch: support lambda expressions ? 183 */ 184 boolean allowLambda; 185 186 /** Switch: support default methods ? 187 */ 188 boolean allowDefaultMethods; 189 190 /** Switch: static interface methods enabled? 191 */ 192 boolean allowStaticInterfaceMethods; 193 194 /** 195 * Switch: warn about use of variable before declaration? 196 * RFE: 6425594 197 */ 198 boolean useBeforeDeclarationWarning; 199 200 /** 201 * Switch: allow strings in switch? 202 */ 203 boolean allowStringsInSwitch; 204 205 /** 206 * Switch: name of source level; used for error reporting. 207 */ 208 String sourceName; 209 210 /** Check kind and type of given tree against protokind and prototype. 211 * If check succeeds, store type in tree and return it. 212 * If check fails, store errType in tree and return it. 213 * No checks are performed if the prototype is a method type. 214 * It is not necessary in this case since we know that kind and type 215 * are correct. 216 * 217 * @param tree The tree whose kind and type is checked 218 * @param found The computed type of the tree 219 * @param ownkind The computed kind of the tree 220 * @param resultInfo The expected result of the tree 221 */ 222 Type check(final JCTree tree, 223 final Type found, 224 final KindSelector ownkind, 225 final ResultInfo resultInfo) { 226 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 227 Type owntype; 228 boolean shouldCheck = !found.hasTag(ERROR) && 229 !resultInfo.pt.hasTag(METHOD) && 230 !resultInfo.pt.hasTag(FORALL); 231 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 232 log.error(tree.pos(), "unexpected.type", 233 resultInfo.pkind.kindNames(), 234 ownkind.kindNames()); 235 owntype = types.createErrorType(found); 236 } else if (allowPoly && inferenceContext.free(found)) { 237 //delay the check if there are inference variables in the found type 238 //this means we are dealing with a partially inferred poly expression 239 owntype = shouldCheck ? resultInfo.pt : found; 240 if (resultInfo.checkMode.installPostInferenceHook()) { 241 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), 242 instantiatedContext -> { 243 ResultInfo pendingResult = 244 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 245 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 246 }); 247 } 248 } else { 249 owntype = shouldCheck ? 250 resultInfo.check(tree, found) : 251 found; 252 } 253 if (resultInfo.checkMode.updateTreeType()) { 254 tree.type = owntype; 255 } 256 return owntype; 257 } 258 259 /** Is given blank final variable assignable, i.e. in a scope where it 260 * may be assigned to even though it is final? 261 * @param v The blank final variable. 262 * @param env The current environment. 263 */ 264 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 265 Symbol owner = env.info.scope.owner; 266 // owner refers to the innermost variable, method or 267 // initializer block declaration at this point. 268 return 269 v.owner == owner 270 || 271 ((owner.name == names.init || // i.e. we are in a constructor 272 owner.kind == VAR || // i.e. we are in a variable initializer 273 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 274 && 275 v.owner == owner.owner 276 && 277 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 278 } 279 280 /** Check that variable can be assigned to. 281 * @param pos The current source code position. 282 * @param v The assigned variable 283 * @param base If the variable is referred to in a Select, the part 284 * to the left of the `.', null otherwise. 285 * @param env The current environment. 286 */ 287 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 288 if ((v.flags() & FINAL) != 0 && 289 ((v.flags() & HASINIT) != 0 290 || 291 !((base == null || 292 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 293 isAssignableAsBlankFinal(v, env)))) { 294 if (v.isResourceVariable()) { //TWR resource 295 log.error(pos, "try.resource.may.not.be.assigned", v); 296 } else { 297 log.error(pos, "cant.assign.val.to.final.var", v); 298 } 299 } 300 } 301 302 /** Does tree represent a static reference to an identifier? 303 * It is assumed that tree is either a SELECT or an IDENT. 304 * We have to weed out selects from non-type names here. 305 * @param tree The candidate tree. 306 */ 307 boolean isStaticReference(JCTree tree) { 308 if (tree.hasTag(SELECT)) { 309 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 310 if (lsym == null || lsym.kind != TYP) { 311 return false; 312 } 313 } 314 return true; 315 } 316 317 /** Is this symbol a type? 318 */ 319 static boolean isType(Symbol sym) { 320 return sym != null && sym.kind == TYP; 321 } 322 323 /** The current `this' symbol. 324 * @param env The current environment. 325 */ 326 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 327 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 328 } 329 330 /** Attribute a parsed identifier. 331 * @param tree Parsed identifier name 332 * @param topLevel The toplevel to use 333 */ 334 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 335 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 336 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 337 syms.errSymbol.name, 338 null, null, null, null); 339 localEnv.enclClass.sym = syms.errSymbol; 340 return tree.accept(identAttributer, localEnv); 341 } 342 // where 343 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 344 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 345 @Override @DefinedBy(Api.COMPILER_TREE) 346 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 347 Symbol site = visit(node.getExpression(), env); 348 if (site.kind == ERR || site.kind == ABSENT_TYP) 349 return site; 350 Name name = (Name)node.getIdentifier(); 351 if (site.kind == PCK) { 352 env.toplevel.packge = (PackageSymbol)site; 353 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 354 KindSelector.TYP_PCK); 355 } else { 356 env.enclClass.sym = (ClassSymbol)site; 357 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 358 } 359 } 360 361 @Override @DefinedBy(Api.COMPILER_TREE) 362 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 363 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 364 } 365 } 366 367 public Type coerce(Type etype, Type ttype) { 368 return cfolder.coerce(etype, ttype); 369 } 370 371 public Type attribType(JCTree node, TypeSymbol sym) { 372 Env<AttrContext> env = typeEnvs.get(sym); 373 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 374 return attribTree(node, localEnv, unknownTypeInfo); 375 } 376 377 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 378 // Attribute qualifying package or class. 379 JCFieldAccess s = (JCFieldAccess)tree.qualid; 380 return attribTree(s.selected, env, 381 new ResultInfo(tree.staticImport ? 382 KindSelector.TYP : KindSelector.TYP_PCK, 383 Type.noType)); 384 } 385 386 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 387 breakTree = tree; 388 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 389 try { 390 attribExpr(expr, env); 391 } catch (BreakAttr b) { 392 return b.env; 393 } catch (AssertionError ae) { 394 if (ae.getCause() instanceof BreakAttr) { 395 return ((BreakAttr)(ae.getCause())).env; 396 } else { 397 throw ae; 398 } 399 } finally { 400 breakTree = null; 401 log.useSource(prev); 402 } 403 return env; 404 } 405 406 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 407 breakTree = tree; 408 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 409 try { 410 attribStat(stmt, env); 411 } catch (BreakAttr b) { 412 return b.env; 413 } catch (AssertionError ae) { 414 if (ae.getCause() instanceof BreakAttr) { 415 return ((BreakAttr)(ae.getCause())).env; 416 } else { 417 throw ae; 418 } 419 } finally { 420 breakTree = null; 421 log.useSource(prev); 422 } 423 return env; 424 } 425 426 private JCTree breakTree = null; 427 428 private static class BreakAttr extends RuntimeException { 429 static final long serialVersionUID = -6924771130405446405L; 430 private Env<AttrContext> env; 431 private BreakAttr(Env<AttrContext> env) { 432 this.env = env; 433 } 434 } 435 436 /** 437 * Mode controlling behavior of Attr.Check 438 */ 439 enum CheckMode { 440 441 NORMAL, 442 443 NO_TREE_UPDATE { // Mode signalling 'fake check' - skip tree update 444 @Override 445 public boolean updateTreeType() { 446 return false; 447 } 448 }, 449 NO_INFERENCE_HOOK { // Mode signalling that caller will manage free types in tree decorations. 450 @Override 451 public boolean installPostInferenceHook() { 452 return false; 453 } 454 }; 455 456 public boolean updateTreeType() { 457 return true; 458 } 459 public boolean installPostInferenceHook() { 460 return true; 461 } 462 } 463 464 465 class ResultInfo { 466 final KindSelector pkind; 467 final Type pt; 468 final CheckContext checkContext; 469 final CheckMode checkMode; 470 471 ResultInfo(KindSelector pkind, Type pt) { 472 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 473 } 474 475 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 476 this(pkind, pt, chk.basicHandler, checkMode); 477 } 478 479 protected ResultInfo(KindSelector pkind, 480 Type pt, CheckContext checkContext) { 481 this(pkind, pt, checkContext, CheckMode.NORMAL); 482 } 483 484 protected ResultInfo(KindSelector pkind, 485 Type pt, CheckContext checkContext, CheckMode checkMode) { 486 this.pkind = pkind; 487 this.pt = pt; 488 this.checkContext = checkContext; 489 this.checkMode = checkMode; 490 } 491 492 protected void attr(JCTree tree, Env<AttrContext> env) { 493 tree.accept(Attr.this); 494 } 495 496 protected Type check(final DiagnosticPosition pos, final Type found) { 497 return chk.checkType(pos, found, pt, checkContext); 498 } 499 500 protected ResultInfo dup(Type newPt) { 501 return new ResultInfo(pkind, newPt, checkContext, checkMode); 502 } 503 504 protected ResultInfo dup(CheckContext newContext) { 505 return new ResultInfo(pkind, pt, newContext, checkMode); 506 } 507 508 protected ResultInfo dup(Type newPt, CheckContext newContext) { 509 return new ResultInfo(pkind, newPt, newContext, checkMode); 510 } 511 512 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 513 return new ResultInfo(pkind, newPt, newContext, newMode); 514 } 515 516 protected ResultInfo dup(CheckMode newMode) { 517 return new ResultInfo(pkind, pt, checkContext, newMode); 518 } 519 520 @Override 521 public String toString() { 522 if (pt != null) { 523 return pt.toString(); 524 } else { 525 return ""; 526 } 527 } 528 } 529 530 class MethodAttrInfo extends ResultInfo { 531 public MethodAttrInfo() { 532 this(chk.basicHandler); 533 } 534 535 public MethodAttrInfo(CheckContext checkContext) { 536 super(KindSelector.VAL, Infer.anyPoly, checkContext); 537 } 538 539 @Override 540 protected void attr(JCTree tree, Env<AttrContext> env) { 541 result = argumentAttr.attribArg(tree, env); 542 } 543 544 protected ResultInfo dup(Type newPt) { 545 throw new IllegalStateException(); 546 } 547 548 protected ResultInfo dup(CheckContext newContext) { 549 return new MethodAttrInfo(newContext); 550 } 551 552 protected ResultInfo dup(Type newPt, CheckContext newContext) { 553 throw new IllegalStateException(); 554 } 555 556 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 557 throw new IllegalStateException(); 558 } 559 560 protected ResultInfo dup(CheckMode newMode) { 561 throw new IllegalStateException(); 562 } 563 } 564 565 class RecoveryInfo extends ResultInfo { 566 567 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 568 super(KindSelector.VAL, Type.recoveryType, 569 new Check.NestedCheckContext(chk.basicHandler) { 570 @Override 571 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 572 return deferredAttrContext; 573 } 574 @Override 575 public boolean compatible(Type found, Type req, Warner warn) { 576 return true; 577 } 578 @Override 579 public void report(DiagnosticPosition pos, JCDiagnostic details) { 580 chk.basicHandler.report(pos, details); 581 } 582 }); 583 } 584 } 585 586 final ResultInfo statInfo; 587 final ResultInfo varAssignmentInfo; 588 final ResultInfo methodAttrInfo; 589 final ResultInfo unknownExprInfo; 590 final ResultInfo unknownTypeInfo; 591 final ResultInfo unknownTypeExprInfo; 592 final ResultInfo recoveryInfo; 593 594 Type pt() { 595 return resultInfo.pt; 596 } 597 598 KindSelector pkind() { 599 return resultInfo.pkind; 600 } 601 602/* ************************************************************************ 603 * Visitor methods 604 *************************************************************************/ 605 606 /** Visitor argument: the current environment. 607 */ 608 Env<AttrContext> env; 609 610 /** Visitor argument: the currently expected attribution result. 611 */ 612 ResultInfo resultInfo; 613 614 /** Visitor result: the computed type. 615 */ 616 Type result; 617 618 /** Visitor method: attribute a tree, catching any completion failure 619 * exceptions. Return the tree's type. 620 * 621 * @param tree The tree to be visited. 622 * @param env The environment visitor argument. 623 * @param resultInfo The result info visitor argument. 624 */ 625 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 626 Env<AttrContext> prevEnv = this.env; 627 ResultInfo prevResult = this.resultInfo; 628 try { 629 this.env = env; 630 this.resultInfo = resultInfo; 631 resultInfo.attr(tree, env); 632 if (tree == breakTree && 633 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 634 throw new BreakAttr(copyEnv(env)); 635 } 636 return result; 637 } catch (CompletionFailure ex) { 638 tree.type = syms.errType; 639 return chk.completionError(tree.pos(), ex); 640 } finally { 641 this.env = prevEnv; 642 this.resultInfo = prevResult; 643 } 644 } 645 646 Env<AttrContext> copyEnv(Env<AttrContext> env) { 647 Env<AttrContext> newEnv = 648 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 649 if (newEnv.outer != null) { 650 newEnv.outer = copyEnv(newEnv.outer); 651 } 652 return newEnv; 653 } 654 655 WriteableScope copyScope(WriteableScope sc) { 656 WriteableScope newScope = WriteableScope.create(sc.owner); 657 List<Symbol> elemsList = List.nil(); 658 for (Symbol sym : sc.getSymbols()) { 659 elemsList = elemsList.prepend(sym); 660 } 661 for (Symbol s : elemsList) { 662 newScope.enter(s); 663 } 664 return newScope; 665 } 666 667 /** Derived visitor method: attribute an expression tree. 668 */ 669 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 670 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 671 } 672 673 /** Derived visitor method: attribute an expression tree with 674 * no constraints on the computed type. 675 */ 676 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 677 return attribTree(tree, env, unknownExprInfo); 678 } 679 680 /** Derived visitor method: attribute a type tree. 681 */ 682 public Type attribType(JCTree tree, Env<AttrContext> env) { 683 Type result = attribType(tree, env, Type.noType); 684 return result; 685 } 686 687 /** Derived visitor method: attribute a type tree. 688 */ 689 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 690 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 691 return result; 692 } 693 694 /** Derived visitor method: attribute a statement or definition tree. 695 */ 696 public Type attribStat(JCTree tree, Env<AttrContext> env) { 697 Env<AttrContext> analyzeEnv = 698 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 699 try { 700 return attribTree(tree, env, statInfo); 701 } finally { 702 analyzer.analyzeIfNeeded(tree, analyzeEnv); 703 } 704 } 705 706 /** Attribute a list of expressions, returning a list of types. 707 */ 708 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 709 ListBuffer<Type> ts = new ListBuffer<>(); 710 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 711 ts.append(attribExpr(l.head, env, pt)); 712 return ts.toList(); 713 } 714 715 /** Attribute a list of statements, returning nothing. 716 */ 717 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 718 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 719 attribStat(l.head, env); 720 } 721 722 /** Attribute the arguments in a method call, returning the method kind. 723 */ 724 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 725 KindSelector kind = initialKind; 726 for (JCExpression arg : trees) { 727 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 728 if (argtype.hasTag(DEFERRED)) { 729 kind = KindSelector.of(KindSelector.POLY, kind); 730 } 731 argtypes.append(argtype); 732 } 733 return kind; 734 } 735 736 /** Attribute a type argument list, returning a list of types. 737 * Caller is responsible for calling checkRefTypes. 738 */ 739 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 740 ListBuffer<Type> argtypes = new ListBuffer<>(); 741 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 742 argtypes.append(attribType(l.head, env)); 743 return argtypes.toList(); 744 } 745 746 /** Attribute a type argument list, returning a list of types. 747 * Check that all the types are references. 748 */ 749 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 750 List<Type> types = attribAnyTypes(trees, env); 751 return chk.checkRefTypes(trees, types); 752 } 753 754 /** 755 * Attribute type variables (of generic classes or methods). 756 * Compound types are attributed later in attribBounds. 757 * @param typarams the type variables to enter 758 * @param env the current environment 759 */ 760 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 761 for (JCTypeParameter tvar : typarams) { 762 TypeVar a = (TypeVar)tvar.type; 763 a.tsym.flags_field |= UNATTRIBUTED; 764 a.bound = Type.noType; 765 if (!tvar.bounds.isEmpty()) { 766 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 767 for (JCExpression bound : tvar.bounds.tail) 768 bounds = bounds.prepend(attribType(bound, env)); 769 types.setBounds(a, bounds.reverse()); 770 } else { 771 // if no bounds are given, assume a single bound of 772 // java.lang.Object. 773 types.setBounds(a, List.of(syms.objectType)); 774 } 775 a.tsym.flags_field &= ~UNATTRIBUTED; 776 } 777 for (JCTypeParameter tvar : typarams) { 778 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 779 } 780 } 781 782 /** 783 * Attribute the type references in a list of annotations. 784 */ 785 void attribAnnotationTypes(List<JCAnnotation> annotations, 786 Env<AttrContext> env) { 787 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 788 JCAnnotation a = al.head; 789 attribType(a.annotationType, env); 790 } 791 } 792 793 /** 794 * Attribute a "lazy constant value". 795 * @param env The env for the const value 796 * @param variable The initializer for the const value 797 * @param type The expected type, or null 798 * @see VarSymbol#setLazyConstValue 799 */ 800 public Object attribLazyConstantValue(Env<AttrContext> env, 801 JCVariableDecl variable, 802 Type type) { 803 804 DiagnosticPosition prevLintPos 805 = deferredLintHandler.setPos(variable.pos()); 806 807 try { 808 Type itype = attribExpr(variable.init, env, type); 809 if (itype.constValue() != null) { 810 return coerce(itype, type).constValue(); 811 } else { 812 return null; 813 } 814 } finally { 815 deferredLintHandler.setPos(prevLintPos); 816 } 817 } 818 819 /** Attribute type reference in an `extends' or `implements' clause. 820 * Supertypes of anonymous inner classes are usually already attributed. 821 * 822 * @param tree The tree making up the type reference. 823 * @param env The environment current at the reference. 824 * @param classExpected true if only a class is expected here. 825 * @param interfaceExpected true if only an interface is expected here. 826 */ 827 Type attribBase(JCTree tree, 828 Env<AttrContext> env, 829 boolean classExpected, 830 boolean interfaceExpected, 831 boolean checkExtensible) { 832 Type t = tree.type != null ? 833 tree.type : 834 attribType(tree, env); 835 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 836 } 837 Type checkBase(Type t, 838 JCTree tree, 839 Env<AttrContext> env, 840 boolean classExpected, 841 boolean interfaceExpected, 842 boolean checkExtensible) { 843 if (t.tsym.isAnonymous()) { 844 log.error(tree.pos(), "cant.inherit.from.anon"); 845 return types.createErrorType(t); 846 } 847 if (t.isErroneous()) 848 return t; 849 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 850 // check that type variable is already visible 851 if (t.getUpperBound() == null) { 852 log.error(tree.pos(), "illegal.forward.ref"); 853 return types.createErrorType(t); 854 } 855 } else { 856 t = chk.checkClassType(tree.pos(), t, checkExtensible); 857 } 858 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 859 log.error(tree.pos(), "intf.expected.here"); 860 // return errType is necessary since otherwise there might 861 // be undetected cycles which cause attribution to loop 862 return types.createErrorType(t); 863 } else if (checkExtensible && 864 classExpected && 865 (t.tsym.flags() & INTERFACE) != 0) { 866 log.error(tree.pos(), "no.intf.expected.here"); 867 return types.createErrorType(t); 868 } 869 if (checkExtensible && 870 ((t.tsym.flags() & FINAL) != 0)) { 871 log.error(tree.pos(), 872 "cant.inherit.from.final", t.tsym); 873 } 874 chk.checkNonCyclic(tree.pos(), t); 875 return t; 876 } 877 878 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 879 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 880 id.type = env.info.scope.owner.enclClass().type; 881 id.sym = env.info.scope.owner.enclClass(); 882 return id.type; 883 } 884 885 public void visitClassDef(JCClassDecl tree) { 886 // Local and anonymous classes have not been entered yet, so we need to 887 // do it now. 888 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 889 enter.classEnter(tree, env); 890 } else { 891 // If this class declaration is part of a class level annotation, 892 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 893 // order to simplify later steps and allow for sensible error 894 // messages. 895 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 896 enter.classEnter(tree, env); 897 } 898 899 ClassSymbol c = tree.sym; 900 if (c == null) { 901 // exit in case something drastic went wrong during enter. 902 result = null; 903 } else { 904 // make sure class has been completed: 905 c.complete(); 906 907 // If this class appears as an anonymous class 908 // in a superclass constructor call where 909 // no explicit outer instance is given, 910 // disable implicit outer instance from being passed. 911 // (This would be an illegal access to "this before super"). 912 if (env.info.isSelfCall && 913 env.tree.hasTag(NEWCLASS) && 914 ((JCNewClass) env.tree).encl == null) 915 { 916 c.flags_field |= NOOUTERTHIS; 917 } 918 attribClass(tree.pos(), c); 919 result = tree.type = c.type; 920 } 921 } 922 923 public void visitMethodDef(JCMethodDecl tree) { 924 MethodSymbol m = tree.sym; 925 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 926 927 Lint lint = env.info.lint.augment(m); 928 Lint prevLint = chk.setLint(lint); 929 MethodSymbol prevMethod = chk.setMethod(m); 930 try { 931 deferredLintHandler.flush(tree.pos()); 932 chk.checkDeprecatedAnnotation(tree.pos(), m); 933 934 935 // Create a new environment with local scope 936 // for attributing the method. 937 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 938 localEnv.info.lint = lint; 939 940 attribStats(tree.typarams, localEnv); 941 942 // If we override any other methods, check that we do so properly. 943 // JLS ??? 944 if (m.isStatic()) { 945 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 946 } else { 947 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 948 } 949 chk.checkOverride(env, tree, m); 950 951 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 952 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 953 } 954 955 // Enter all type parameters into the local method scope. 956 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 957 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 958 959 ClassSymbol owner = env.enclClass.sym; 960 if ((owner.flags() & ANNOTATION) != 0 && 961 tree.params.nonEmpty()) 962 log.error(tree.params.head.pos(), 963 "intf.annotation.members.cant.have.params"); 964 965 // Attribute all value parameters. 966 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 967 attribStat(l.head, localEnv); 968 } 969 970 chk.checkVarargsMethodDecl(localEnv, tree); 971 972 // Check that type parameters are well-formed. 973 chk.validate(tree.typarams, localEnv); 974 975 // Check that result type is well-formed. 976 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 977 chk.validate(tree.restype, localEnv); 978 979 // Check that receiver type is well-formed. 980 if (tree.recvparam != null) { 981 // Use a new environment to check the receiver parameter. 982 // Otherwise I get "might not have been initialized" errors. 983 // Is there a better way? 984 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 985 attribType(tree.recvparam, newEnv); 986 chk.validate(tree.recvparam, newEnv); 987 } 988 989 // annotation method checks 990 if ((owner.flags() & ANNOTATION) != 0) { 991 // annotation method cannot have throws clause 992 if (tree.thrown.nonEmpty()) { 993 log.error(tree.thrown.head.pos(), 994 "throws.not.allowed.in.intf.annotation"); 995 } 996 // annotation method cannot declare type-parameters 997 if (tree.typarams.nonEmpty()) { 998 log.error(tree.typarams.head.pos(), 999 "intf.annotation.members.cant.have.type.params"); 1000 } 1001 // validate annotation method's return type (could be an annotation type) 1002 chk.validateAnnotationType(tree.restype); 1003 // ensure that annotation method does not clash with members of Object/Annotation 1004 chk.validateAnnotationMethod(tree.pos(), m); 1005 } 1006 1007 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1008 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1009 1010 if (tree.body == null) { 1011 // Empty bodies are only allowed for 1012 // abstract, native, or interface methods, or for methods 1013 // in a retrofit signature class. 1014 if (tree.defaultValue != null) { 1015 if ((owner.flags() & ANNOTATION) == 0) 1016 log.error(tree.pos(), 1017 "default.allowed.in.intf.annotation.member"); 1018 } 1019 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 && 1020 !relax) 1021 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1022 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1023 if ((owner.flags() & INTERFACE) != 0) { 1024 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1025 } else { 1026 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1027 } 1028 } else if ((tree.mods.flags & NATIVE) != 0) { 1029 log.error(tree.pos(), "native.meth.cant.have.body"); 1030 } else { 1031 // Add an implicit super() call unless an explicit call to 1032 // super(...) or this(...) is given 1033 // or we are compiling class java.lang.Object. 1034 if (tree.name == names.init && owner.type != syms.objectType) { 1035 JCBlock body = tree.body; 1036 if (body.stats.isEmpty() || 1037 !TreeInfo.isSelfCall(body.stats.head)) { 1038 body.stats = body.stats. 1039 prepend(typeEnter.SuperCall(make.at(body.pos), 1040 List.<Type>nil(), 1041 List.<JCVariableDecl>nil(), 1042 false)); 1043 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1044 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1045 TreeInfo.isSuperCall(body.stats.head)) { 1046 // enum constructors are not allowed to call super 1047 // directly, so make sure there aren't any super calls 1048 // in enum constructors, except in the compiler 1049 // generated one. 1050 log.error(tree.body.stats.head.pos(), 1051 "call.to.super.not.allowed.in.enum.ctor", 1052 env.enclClass.sym); 1053 } 1054 } 1055 1056 // Attribute all type annotations in the body 1057 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1058 annotate.flush(); 1059 1060 // Attribute method body. 1061 attribStat(tree.body, localEnv); 1062 } 1063 1064 localEnv.info.scope.leave(); 1065 result = tree.type = m.type; 1066 } finally { 1067 chk.setLint(prevLint); 1068 chk.setMethod(prevMethod); 1069 } 1070 } 1071 1072 public void visitVarDef(JCVariableDecl tree) { 1073 // Local variables have not been entered yet, so we need to do it now: 1074 if (env.info.scope.owner.kind == MTH) { 1075 if (tree.sym != null) { 1076 // parameters have already been entered 1077 env.info.scope.enter(tree.sym); 1078 } else { 1079 try { 1080 annotate.blockAnnotations(); 1081 memberEnter.memberEnter(tree, env); 1082 } finally { 1083 annotate.unblockAnnotations(); 1084 } 1085 } 1086 } else { 1087 if (tree.init != null) { 1088 // Field initializer expression need to be entered. 1089 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1090 annotate.flush(); 1091 } 1092 } 1093 1094 VarSymbol v = tree.sym; 1095 Lint lint = env.info.lint.augment(v); 1096 Lint prevLint = chk.setLint(lint); 1097 1098 // Check that the variable's declared type is well-formed. 1099 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1100 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1101 (tree.sym.flags() & PARAMETER) != 0; 1102 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1103 1104 try { 1105 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1106 deferredLintHandler.flush(tree.pos()); 1107 chk.checkDeprecatedAnnotation(tree.pos(), v); 1108 1109 if (tree.init != null) { 1110 if ((v.flags_field & FINAL) == 0 || 1111 !memberEnter.needsLazyConstValue(tree.init)) { 1112 // Not a compile-time constant 1113 // Attribute initializer in a new environment 1114 // with the declared variable as owner. 1115 // Check that initializer conforms to variable's declared type. 1116 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1117 initEnv.info.lint = lint; 1118 // In order to catch self-references, we set the variable's 1119 // declaration position to maximal possible value, effectively 1120 // marking the variable as undefined. 1121 initEnv.info.enclVar = v; 1122 attribExpr(tree.init, initEnv, v.type); 1123 } 1124 } 1125 result = tree.type = v.type; 1126 } 1127 finally { 1128 chk.setLint(prevLint); 1129 } 1130 } 1131 1132 public void visitSkip(JCSkip tree) { 1133 result = null; 1134 } 1135 1136 public void visitBlock(JCBlock tree) { 1137 if (env.info.scope.owner.kind == TYP) { 1138 // Block is a static or instance initializer; 1139 // let the owner of the environment be a freshly 1140 // created BLOCK-method. 1141 Symbol fakeOwner = 1142 new MethodSymbol(tree.flags | BLOCK | 1143 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1144 env.info.scope.owner); 1145 final Env<AttrContext> localEnv = 1146 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1147 1148 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1149 // Attribute all type annotations in the block 1150 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1151 annotate.flush(); 1152 attribStats(tree.stats, localEnv); 1153 1154 { 1155 // Store init and clinit type annotations with the ClassSymbol 1156 // to allow output in Gen.normalizeDefs. 1157 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1158 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1159 if ((tree.flags & STATIC) != 0) { 1160 cs.appendClassInitTypeAttributes(tas); 1161 } else { 1162 cs.appendInitTypeAttributes(tas); 1163 } 1164 } 1165 } else { 1166 // Create a new local environment with a local scope. 1167 Env<AttrContext> localEnv = 1168 env.dup(tree, env.info.dup(env.info.scope.dup())); 1169 try { 1170 attribStats(tree.stats, localEnv); 1171 } finally { 1172 localEnv.info.scope.leave(); 1173 } 1174 } 1175 result = null; 1176 } 1177 1178 public void visitDoLoop(JCDoWhileLoop tree) { 1179 attribStat(tree.body, env.dup(tree)); 1180 attribExpr(tree.cond, env, syms.booleanType); 1181 result = null; 1182 } 1183 1184 public void visitWhileLoop(JCWhileLoop tree) { 1185 attribExpr(tree.cond, env, syms.booleanType); 1186 attribStat(tree.body, env.dup(tree)); 1187 result = null; 1188 } 1189 1190 public void visitForLoop(JCForLoop tree) { 1191 Env<AttrContext> loopEnv = 1192 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1193 try { 1194 attribStats(tree.init, loopEnv); 1195 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1196 loopEnv.tree = tree; // before, we were not in loop! 1197 attribStats(tree.step, loopEnv); 1198 attribStat(tree.body, loopEnv); 1199 result = null; 1200 } 1201 finally { 1202 loopEnv.info.scope.leave(); 1203 } 1204 } 1205 1206 public void visitForeachLoop(JCEnhancedForLoop tree) { 1207 Env<AttrContext> loopEnv = 1208 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1209 try { 1210 //the Formal Parameter of a for-each loop is not in the scope when 1211 //attributing the for-each expression; we mimick this by attributing 1212 //the for-each expression first (against original scope). 1213 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1214 attribStat(tree.var, loopEnv); 1215 chk.checkNonVoid(tree.pos(), exprType); 1216 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1217 if (elemtype == null) { 1218 // or perhaps expr implements Iterable<T>? 1219 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1220 if (base == null) { 1221 log.error(tree.expr.pos(), 1222 "foreach.not.applicable.to.type", 1223 exprType, 1224 diags.fragment("type.req.array.or.iterable")); 1225 elemtype = types.createErrorType(exprType); 1226 } else { 1227 List<Type> iterableParams = base.allparams(); 1228 elemtype = iterableParams.isEmpty() 1229 ? syms.objectType 1230 : types.wildUpperBound(iterableParams.head); 1231 } 1232 } 1233 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1234 loopEnv.tree = tree; // before, we were not in loop! 1235 attribStat(tree.body, loopEnv); 1236 result = null; 1237 } 1238 finally { 1239 loopEnv.info.scope.leave(); 1240 } 1241 } 1242 1243 public void visitLabelled(JCLabeledStatement tree) { 1244 // Check that label is not used in an enclosing statement 1245 Env<AttrContext> env1 = env; 1246 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1247 if (env1.tree.hasTag(LABELLED) && 1248 ((JCLabeledStatement) env1.tree).label == tree.label) { 1249 log.error(tree.pos(), "label.already.in.use", 1250 tree.label); 1251 break; 1252 } 1253 env1 = env1.next; 1254 } 1255 1256 attribStat(tree.body, env.dup(tree)); 1257 result = null; 1258 } 1259 1260 public void visitSwitch(JCSwitch tree) { 1261 Type seltype = attribExpr(tree.selector, env); 1262 1263 Env<AttrContext> switchEnv = 1264 env.dup(tree, env.info.dup(env.info.scope.dup())); 1265 1266 try { 1267 1268 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1269 boolean stringSwitch = false; 1270 if (types.isSameType(seltype, syms.stringType)) { 1271 if (allowStringsInSwitch) { 1272 stringSwitch = true; 1273 } else { 1274 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1275 } 1276 } 1277 if (!enumSwitch && !stringSwitch) 1278 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1279 1280 // Attribute all cases and 1281 // check that there are no duplicate case labels or default clauses. 1282 Set<Object> labels = new HashSet<>(); // The set of case labels. 1283 boolean hasDefault = false; // Is there a default label? 1284 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1285 JCCase c = l.head; 1286 if (c.pat != null) { 1287 if (enumSwitch) { 1288 Symbol sym = enumConstant(c.pat, seltype); 1289 if (sym == null) { 1290 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1291 } else if (!labels.add(sym)) { 1292 log.error(c.pos(), "duplicate.case.label"); 1293 } 1294 } else { 1295 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1296 if (!pattype.hasTag(ERROR)) { 1297 if (pattype.constValue() == null) { 1298 log.error(c.pat.pos(), 1299 (stringSwitch ? "string.const.req" : "const.expr.req")); 1300 } else if (!labels.add(pattype.constValue())) { 1301 log.error(c.pos(), "duplicate.case.label"); 1302 } 1303 } 1304 } 1305 } else if (hasDefault) { 1306 log.error(c.pos(), "duplicate.default.label"); 1307 } else { 1308 hasDefault = true; 1309 } 1310 Env<AttrContext> caseEnv = 1311 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1312 try { 1313 attribStats(c.stats, caseEnv); 1314 } finally { 1315 caseEnv.info.scope.leave(); 1316 addVars(c.stats, switchEnv.info.scope); 1317 } 1318 } 1319 1320 result = null; 1321 } 1322 finally { 1323 switchEnv.info.scope.leave(); 1324 } 1325 } 1326 // where 1327 /** Add any variables defined in stats to the switch scope. */ 1328 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1329 for (;stats.nonEmpty(); stats = stats.tail) { 1330 JCTree stat = stats.head; 1331 if (stat.hasTag(VARDEF)) 1332 switchScope.enter(((JCVariableDecl) stat).sym); 1333 } 1334 } 1335 // where 1336 /** Return the selected enumeration constant symbol, or null. */ 1337 private Symbol enumConstant(JCTree tree, Type enumType) { 1338 if (tree.hasTag(IDENT)) { 1339 JCIdent ident = (JCIdent)tree; 1340 Name name = ident.name; 1341 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1342 if (sym.kind == VAR) { 1343 Symbol s = ident.sym = sym; 1344 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1345 ident.type = s.type; 1346 return ((s.flags_field & Flags.ENUM) == 0) 1347 ? null : s; 1348 } 1349 } 1350 } 1351 return null; 1352 } 1353 1354 public void visitSynchronized(JCSynchronized tree) { 1355 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1356 attribStat(tree.body, env); 1357 result = null; 1358 } 1359 1360 public void visitTry(JCTry tree) { 1361 // Create a new local environment with a local 1362 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1363 try { 1364 boolean isTryWithResource = tree.resources.nonEmpty(); 1365 // Create a nested environment for attributing the try block if needed 1366 Env<AttrContext> tryEnv = isTryWithResource ? 1367 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1368 localEnv; 1369 try { 1370 // Attribute resource declarations 1371 for (JCTree resource : tree.resources) { 1372 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1373 @Override 1374 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1375 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1376 } 1377 }; 1378 ResultInfo twrResult = 1379 new ResultInfo(KindSelector.VAR, 1380 syms.autoCloseableType, 1381 twrContext); 1382 if (resource.hasTag(VARDEF)) { 1383 attribStat(resource, tryEnv); 1384 twrResult.check(resource, resource.type); 1385 1386 //check that resource type cannot throw InterruptedException 1387 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1388 1389 VarSymbol var = ((JCVariableDecl) resource).sym; 1390 var.setData(ElementKind.RESOURCE_VARIABLE); 1391 } else { 1392 attribTree(resource, tryEnv, twrResult); 1393 } 1394 } 1395 // Attribute body 1396 attribStat(tree.body, tryEnv); 1397 } finally { 1398 if (isTryWithResource) 1399 tryEnv.info.scope.leave(); 1400 } 1401 1402 // Attribute catch clauses 1403 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1404 JCCatch c = l.head; 1405 Env<AttrContext> catchEnv = 1406 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1407 try { 1408 Type ctype = attribStat(c.param, catchEnv); 1409 if (TreeInfo.isMultiCatch(c)) { 1410 //multi-catch parameter is implicitly marked as final 1411 c.param.sym.flags_field |= FINAL | UNION; 1412 } 1413 if (c.param.sym.kind == VAR) { 1414 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1415 } 1416 chk.checkType(c.param.vartype.pos(), 1417 chk.checkClassType(c.param.vartype.pos(), ctype), 1418 syms.throwableType); 1419 attribStat(c.body, catchEnv); 1420 } finally { 1421 catchEnv.info.scope.leave(); 1422 } 1423 } 1424 1425 // Attribute finalizer 1426 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1427 result = null; 1428 } 1429 finally { 1430 localEnv.info.scope.leave(); 1431 } 1432 } 1433 1434 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1435 if (!resource.isErroneous() && 1436 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1437 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1438 Symbol close = syms.noSymbol; 1439 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1440 try { 1441 close = rs.resolveQualifiedMethod(pos, 1442 env, 1443 resource, 1444 names.close, 1445 List.<Type>nil(), 1446 List.<Type>nil()); 1447 } 1448 finally { 1449 log.popDiagnosticHandler(discardHandler); 1450 } 1451 if (close.kind == MTH && 1452 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1453 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1454 env.info.lint.isEnabled(LintCategory.TRY)) { 1455 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1456 } 1457 } 1458 } 1459 1460 public void visitConditional(JCConditional tree) { 1461 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1462 1463 tree.polyKind = (!allowPoly || 1464 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1465 isBooleanOrNumeric(env, tree)) ? 1466 PolyKind.STANDALONE : PolyKind.POLY; 1467 1468 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1469 //this means we are returning a poly conditional from void-compatible lambda expression 1470 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1471 result = tree.type = types.createErrorType(resultInfo.pt); 1472 return; 1473 } 1474 1475 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1476 unknownExprInfo : 1477 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1478 1479 Type truetype = attribTree(tree.truepart, env, condInfo); 1480 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1481 1482 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1483 if (condtype.constValue() != null && 1484 truetype.constValue() != null && 1485 falsetype.constValue() != null && 1486 !owntype.hasTag(NONE)) { 1487 //constant folding 1488 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1489 } 1490 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1491 } 1492 //where 1493 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1494 switch (tree.getTag()) { 1495 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1496 ((JCLiteral)tree).typetag == BOOLEAN || 1497 ((JCLiteral)tree).typetag == BOT; 1498 case LAMBDA: case REFERENCE: return false; 1499 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1500 case CONDEXPR: 1501 JCConditional condTree = (JCConditional)tree; 1502 return isBooleanOrNumeric(env, condTree.truepart) && 1503 isBooleanOrNumeric(env, condTree.falsepart); 1504 case APPLY: 1505 JCMethodInvocation speculativeMethodTree = 1506 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo); 1507 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1508 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1509 env.enclClass.type : 1510 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1511 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1512 return primitiveOrBoxed(owntype); 1513 case NEWCLASS: 1514 JCExpression className = 1515 removeClassParams.translate(((JCNewClass)tree).clazz); 1516 JCExpression speculativeNewClassTree = 1517 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo); 1518 return primitiveOrBoxed(speculativeNewClassTree.type); 1519 default: 1520 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type; 1521 return primitiveOrBoxed(speculativeType); 1522 } 1523 } 1524 //where 1525 boolean primitiveOrBoxed(Type t) { 1526 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1527 } 1528 1529 TreeTranslator removeClassParams = new TreeTranslator() { 1530 @Override 1531 public void visitTypeApply(JCTypeApply tree) { 1532 result = translate(tree.clazz); 1533 } 1534 }; 1535 1536 CheckContext conditionalContext(CheckContext checkContext) { 1537 return new Check.NestedCheckContext(checkContext) { 1538 //this will use enclosing check context to check compatibility of 1539 //subexpression against target type; if we are in a method check context, 1540 //depending on whether boxing is allowed, we could have incompatibilities 1541 @Override 1542 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1543 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1544 } 1545 }; 1546 } 1547 1548 /** Compute the type of a conditional expression, after 1549 * checking that it exists. See JLS 15.25. Does not take into 1550 * account the special case where condition and both arms 1551 * are constants. 1552 * 1553 * @param pos The source position to be used for error 1554 * diagnostics. 1555 * @param thentype The type of the expression's then-part. 1556 * @param elsetype The type of the expression's else-part. 1557 */ 1558 Type condType(DiagnosticPosition pos, 1559 Type thentype, Type elsetype) { 1560 // If same type, that is the result 1561 if (types.isSameType(thentype, elsetype)) 1562 return thentype.baseType(); 1563 1564 Type thenUnboxed = (thentype.isPrimitive()) 1565 ? thentype : types.unboxedType(thentype); 1566 Type elseUnboxed = (elsetype.isPrimitive()) 1567 ? elsetype : types.unboxedType(elsetype); 1568 1569 // Otherwise, if both arms can be converted to a numeric 1570 // type, return the least numeric type that fits both arms 1571 // (i.e. return larger of the two, or return int if one 1572 // arm is short, the other is char). 1573 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1574 // If one arm has an integer subrange type (i.e., byte, 1575 // short, or char), and the other is an integer constant 1576 // that fits into the subrange, return the subrange type. 1577 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1578 elseUnboxed.hasTag(INT) && 1579 types.isAssignable(elseUnboxed, thenUnboxed)) { 1580 return thenUnboxed.baseType(); 1581 } 1582 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1583 thenUnboxed.hasTag(INT) && 1584 types.isAssignable(thenUnboxed, elseUnboxed)) { 1585 return elseUnboxed.baseType(); 1586 } 1587 1588 for (TypeTag tag : primitiveTags) { 1589 Type candidate = syms.typeOfTag[tag.ordinal()]; 1590 if (types.isSubtype(thenUnboxed, candidate) && 1591 types.isSubtype(elseUnboxed, candidate)) { 1592 return candidate; 1593 } 1594 } 1595 } 1596 1597 // Those were all the cases that could result in a primitive 1598 if (thentype.isPrimitive()) 1599 thentype = types.boxedClass(thentype).type; 1600 if (elsetype.isPrimitive()) 1601 elsetype = types.boxedClass(elsetype).type; 1602 1603 if (types.isSubtype(thentype, elsetype)) 1604 return elsetype.baseType(); 1605 if (types.isSubtype(elsetype, thentype)) 1606 return thentype.baseType(); 1607 1608 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1609 log.error(pos, "neither.conditional.subtype", 1610 thentype, elsetype); 1611 return thentype.baseType(); 1612 } 1613 1614 // both are known to be reference types. The result is 1615 // lub(thentype,elsetype). This cannot fail, as it will 1616 // always be possible to infer "Object" if nothing better. 1617 return types.lub(thentype.baseType(), elsetype.baseType()); 1618 } 1619 1620 final static TypeTag[] primitiveTags = new TypeTag[]{ 1621 BYTE, 1622 CHAR, 1623 SHORT, 1624 INT, 1625 LONG, 1626 FLOAT, 1627 DOUBLE, 1628 BOOLEAN, 1629 }; 1630 1631 public void visitIf(JCIf tree) { 1632 attribExpr(tree.cond, env, syms.booleanType); 1633 attribStat(tree.thenpart, env); 1634 if (tree.elsepart != null) 1635 attribStat(tree.elsepart, env); 1636 chk.checkEmptyIf(tree); 1637 result = null; 1638 } 1639 1640 public void visitExec(JCExpressionStatement tree) { 1641 //a fresh environment is required for 292 inference to work properly --- 1642 //see Infer.instantiatePolymorphicSignatureInstance() 1643 Env<AttrContext> localEnv = env.dup(tree); 1644 attribExpr(tree.expr, localEnv); 1645 result = null; 1646 } 1647 1648 public void visitBreak(JCBreak tree) { 1649 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1650 result = null; 1651 } 1652 1653 public void visitContinue(JCContinue tree) { 1654 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1655 result = null; 1656 } 1657 //where 1658 /** Return the target of a break or continue statement, if it exists, 1659 * report an error if not. 1660 * Note: The target of a labelled break or continue is the 1661 * (non-labelled) statement tree referred to by the label, 1662 * not the tree representing the labelled statement itself. 1663 * 1664 * @param pos The position to be used for error diagnostics 1665 * @param tag The tag of the jump statement. This is either 1666 * Tree.BREAK or Tree.CONTINUE. 1667 * @param label The label of the jump statement, or null if no 1668 * label is given. 1669 * @param env The environment current at the jump statement. 1670 */ 1671 private JCTree findJumpTarget(DiagnosticPosition pos, 1672 JCTree.Tag tag, 1673 Name label, 1674 Env<AttrContext> env) { 1675 // Search environments outwards from the point of jump. 1676 Env<AttrContext> env1 = env; 1677 LOOP: 1678 while (env1 != null) { 1679 switch (env1.tree.getTag()) { 1680 case LABELLED: 1681 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1682 if (label == labelled.label) { 1683 // If jump is a continue, check that target is a loop. 1684 if (tag == CONTINUE) { 1685 if (!labelled.body.hasTag(DOLOOP) && 1686 !labelled.body.hasTag(WHILELOOP) && 1687 !labelled.body.hasTag(FORLOOP) && 1688 !labelled.body.hasTag(FOREACHLOOP)) 1689 log.error(pos, "not.loop.label", label); 1690 // Found labelled statement target, now go inwards 1691 // to next non-labelled tree. 1692 return TreeInfo.referencedStatement(labelled); 1693 } else { 1694 return labelled; 1695 } 1696 } 1697 break; 1698 case DOLOOP: 1699 case WHILELOOP: 1700 case FORLOOP: 1701 case FOREACHLOOP: 1702 if (label == null) return env1.tree; 1703 break; 1704 case SWITCH: 1705 if (label == null && tag == BREAK) return env1.tree; 1706 break; 1707 case LAMBDA: 1708 case METHODDEF: 1709 case CLASSDEF: 1710 break LOOP; 1711 default: 1712 } 1713 env1 = env1.next; 1714 } 1715 if (label != null) 1716 log.error(pos, "undef.label", label); 1717 else if (tag == CONTINUE) 1718 log.error(pos, "cont.outside.loop"); 1719 else 1720 log.error(pos, "break.outside.switch.loop"); 1721 return null; 1722 } 1723 1724 public void visitReturn(JCReturn tree) { 1725 // Check that there is an enclosing method which is 1726 // nested within than the enclosing class. 1727 if (env.info.returnResult == null) { 1728 log.error(tree.pos(), "ret.outside.meth"); 1729 } else { 1730 // Attribute return expression, if it exists, and check that 1731 // it conforms to result type of enclosing method. 1732 if (tree.expr != null) { 1733 if (env.info.returnResult.pt.hasTag(VOID)) { 1734 env.info.returnResult.checkContext.report(tree.expr.pos(), 1735 diags.fragment("unexpected.ret.val")); 1736 } 1737 attribTree(tree.expr, env, env.info.returnResult); 1738 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1739 !env.info.returnResult.pt.hasTag(NONE)) { 1740 env.info.returnResult.checkContext.report(tree.pos(), 1741 diags.fragment("missing.ret.val")); 1742 } 1743 } 1744 result = null; 1745 } 1746 1747 public void visitThrow(JCThrow tree) { 1748 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1749 if (allowPoly) { 1750 chk.checkType(tree, owntype, syms.throwableType); 1751 } 1752 result = null; 1753 } 1754 1755 public void visitAssert(JCAssert tree) { 1756 attribExpr(tree.cond, env, syms.booleanType); 1757 if (tree.detail != null) { 1758 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1759 } 1760 result = null; 1761 } 1762 1763 /** Visitor method for method invocations. 1764 * NOTE: The method part of an application will have in its type field 1765 * the return type of the method, not the method's type itself! 1766 */ 1767 public void visitApply(JCMethodInvocation tree) { 1768 // The local environment of a method application is 1769 // a new environment nested in the current one. 1770 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1771 1772 // The types of the actual method arguments. 1773 List<Type> argtypes; 1774 1775 // The types of the actual method type arguments. 1776 List<Type> typeargtypes = null; 1777 1778 Name methName = TreeInfo.name(tree.meth); 1779 1780 boolean isConstructorCall = 1781 methName == names._this || methName == names._super; 1782 1783 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1784 if (isConstructorCall) { 1785 // We are seeing a ...this(...) or ...super(...) call. 1786 // Check that this is the first statement in a constructor. 1787 if (checkFirstConstructorStat(tree, env)) { 1788 1789 // Record the fact 1790 // that this is a constructor call (using isSelfCall). 1791 localEnv.info.isSelfCall = true; 1792 1793 // Attribute arguments, yielding list of argument types. 1794 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 1795 argtypes = argtypesBuf.toList(); 1796 typeargtypes = attribTypes(tree.typeargs, localEnv); 1797 1798 // Variable `site' points to the class in which the called 1799 // constructor is defined. 1800 Type site = env.enclClass.sym.type; 1801 if (methName == names._super) { 1802 if (site == syms.objectType) { 1803 log.error(tree.meth.pos(), "no.superclass", site); 1804 site = types.createErrorType(syms.objectType); 1805 } else { 1806 site = types.supertype(site); 1807 } 1808 } 1809 1810 if (site.hasTag(CLASS)) { 1811 Type encl = site.getEnclosingType(); 1812 while (encl != null && encl.hasTag(TYPEVAR)) 1813 encl = encl.getUpperBound(); 1814 if (encl.hasTag(CLASS)) { 1815 // we are calling a nested class 1816 1817 if (tree.meth.hasTag(SELECT)) { 1818 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1819 1820 // We are seeing a prefixed call, of the form 1821 // <expr>.super(...). 1822 // Check that the prefix expression conforms 1823 // to the outer instance type of the class. 1824 chk.checkRefType(qualifier.pos(), 1825 attribExpr(qualifier, localEnv, 1826 encl)); 1827 } else if (methName == names._super) { 1828 // qualifier omitted; check for existence 1829 // of an appropriate implicit qualifier. 1830 rs.resolveImplicitThis(tree.meth.pos(), 1831 localEnv, site, true); 1832 } 1833 } else if (tree.meth.hasTag(SELECT)) { 1834 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1835 site.tsym); 1836 } 1837 1838 // if we're calling a java.lang.Enum constructor, 1839 // prefix the implicit String and int parameters 1840 if (site.tsym == syms.enumSym) 1841 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1842 1843 // Resolve the called constructor under the assumption 1844 // that we are referring to a superclass instance of the 1845 // current instance (JLS ???). 1846 boolean selectSuperPrev = localEnv.info.selectSuper; 1847 localEnv.info.selectSuper = true; 1848 localEnv.info.pendingResolutionPhase = null; 1849 Symbol sym = rs.resolveConstructor( 1850 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1851 localEnv.info.selectSuper = selectSuperPrev; 1852 1853 // Set method symbol to resolved constructor... 1854 TreeInfo.setSymbol(tree.meth, sym); 1855 1856 // ...and check that it is legal in the current context. 1857 // (this will also set the tree's type) 1858 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1859 checkId(tree.meth, site, sym, localEnv, 1860 new ResultInfo(kind, mpt)); 1861 } 1862 // Otherwise, `site' is an error type and we do nothing 1863 } 1864 result = tree.type = syms.voidType; 1865 } else { 1866 // Otherwise, we are seeing a regular method call. 1867 // Attribute the arguments, yielding list of argument types, ... 1868 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1869 argtypes = argtypesBuf.toList(); 1870 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1871 1872 // ... and attribute the method using as a prototype a methodtype 1873 // whose formal argument types is exactly the list of actual 1874 // arguments (this will also set the method symbol). 1875 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1876 localEnv.info.pendingResolutionPhase = null; 1877 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1878 1879 // Compute the result type. 1880 Type restype = mtype.getReturnType(); 1881 if (restype.hasTag(WILDCARD)) 1882 throw new AssertionError(mtype); 1883 1884 Type qualifier = (tree.meth.hasTag(SELECT)) 1885 ? ((JCFieldAccess) tree.meth).selected.type 1886 : env.enclClass.sym.type; 1887 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype); 1888 1889 chk.checkRefTypes(tree.typeargs, typeargtypes); 1890 1891 // Check that value of resulting type is admissible in the 1892 // current context. Also, capture the return type 1893 result = check(tree, capture(restype), KindSelector.VAL, resultInfo); 1894 } 1895 chk.validate(tree.typeargs, localEnv); 1896 } 1897 //where 1898 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1899 if (methodName == names.clone && types.isArray(qualifierType)) { 1900 // as a special case, array.clone() has a result that is 1901 // the same as static type of the array being cloned 1902 return qualifierType; 1903 } else if (methodName == names.getClass && argtypes.isEmpty()) { 1904 // as a special case, x.getClass() has type Class<? extends |X|> 1905 return new ClassType(restype.getEnclosingType(), 1906 List.<Type>of(new WildcardType(types.erasure(qualifierType), 1907 BoundKind.EXTENDS, 1908 syms.boundClass)), 1909 restype.tsym, 1910 restype.getMetadata()); 1911 } else { 1912 return restype; 1913 } 1914 } 1915 1916 /** Check that given application node appears as first statement 1917 * in a constructor call. 1918 * @param tree The application node 1919 * @param env The environment current at the application. 1920 */ 1921 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1922 JCMethodDecl enclMethod = env.enclMethod; 1923 if (enclMethod != null && enclMethod.name == names.init) { 1924 JCBlock body = enclMethod.body; 1925 if (body.stats.head.hasTag(EXEC) && 1926 ((JCExpressionStatement) body.stats.head).expr == tree) 1927 return true; 1928 } 1929 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1930 TreeInfo.name(tree.meth)); 1931 return false; 1932 } 1933 1934 /** Obtain a method type with given argument types. 1935 */ 1936 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1937 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass); 1938 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1939 } 1940 1941 public void visitNewClass(final JCNewClass tree) { 1942 Type owntype = types.createErrorType(tree.type); 1943 1944 // The local environment of a class creation is 1945 // a new environment nested in the current one. 1946 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1947 1948 // The anonymous inner class definition of the new expression, 1949 // if one is defined by it. 1950 JCClassDecl cdef = tree.def; 1951 1952 // If enclosing class is given, attribute it, and 1953 // complete class name to be fully qualified 1954 JCExpression clazz = tree.clazz; // Class field following new 1955 JCExpression clazzid; // Identifier in class field 1956 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1957 annoclazzid = null; 1958 1959 if (clazz.hasTag(TYPEAPPLY)) { 1960 clazzid = ((JCTypeApply) clazz).clazz; 1961 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1962 annoclazzid = (JCAnnotatedType) clazzid; 1963 clazzid = annoclazzid.underlyingType; 1964 } 1965 } else { 1966 if (clazz.hasTag(ANNOTATED_TYPE)) { 1967 annoclazzid = (JCAnnotatedType) clazz; 1968 clazzid = annoclazzid.underlyingType; 1969 } else { 1970 clazzid = clazz; 1971 } 1972 } 1973 1974 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1975 1976 if (tree.encl != null) { 1977 // We are seeing a qualified new, of the form 1978 // <expr>.new C <...> (...) ... 1979 // In this case, we let clazz stand for the name of the 1980 // allocated class C prefixed with the type of the qualifier 1981 // expression, so that we can 1982 // resolve it with standard techniques later. I.e., if 1983 // <expr> has type T, then <expr>.new C <...> (...) 1984 // yields a clazz T.C. 1985 Type encltype = chk.checkRefType(tree.encl.pos(), 1986 attribExpr(tree.encl, env)); 1987 // TODO 308: in <expr>.new C, do we also want to add the type annotations 1988 // from expr to the combined type, or not? Yes, do this. 1989 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 1990 ((JCIdent) clazzid).name); 1991 1992 EndPosTable endPosTable = this.env.toplevel.endPositions; 1993 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 1994 if (clazz.hasTag(ANNOTATED_TYPE)) { 1995 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 1996 List<JCAnnotation> annos = annoType.annotations; 1997 1998 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 1999 clazzid1 = make.at(tree.pos). 2000 TypeApply(clazzid1, 2001 ((JCTypeApply) clazz).arguments); 2002 } 2003 2004 clazzid1 = make.at(tree.pos). 2005 AnnotatedType(annos, clazzid1); 2006 } else if (clazz.hasTag(TYPEAPPLY)) { 2007 clazzid1 = make.at(tree.pos). 2008 TypeApply(clazzid1, 2009 ((JCTypeApply) clazz).arguments); 2010 } 2011 2012 clazz = clazzid1; 2013 } 2014 2015 // Attribute clazz expression and store 2016 // symbol + type back into the attributed tree. 2017 Type clazztype; 2018 2019 try { 2020 env.info.isNewClass = true; 2021 clazztype = TreeInfo.isEnumInit(env.tree) ? 2022 attribIdentAsEnumType(env, (JCIdent)clazz) : 2023 attribType(clazz, env); 2024 } finally { 2025 env.info.isNewClass = false; 2026 } 2027 2028 clazztype = chk.checkDiamond(tree, clazztype); 2029 chk.validate(clazz, localEnv); 2030 if (tree.encl != null) { 2031 // We have to work in this case to store 2032 // symbol + type back into the attributed tree. 2033 tree.clazz.type = clazztype; 2034 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2035 clazzid.type = ((JCIdent) clazzid).sym.type; 2036 if (annoclazzid != null) { 2037 annoclazzid.type = clazzid.type; 2038 } 2039 if (!clazztype.isErroneous()) { 2040 if (cdef != null && clazztype.tsym.isInterface()) { 2041 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2042 } else if (clazztype.tsym.isStatic()) { 2043 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2044 } 2045 } 2046 } else if (!clazztype.tsym.isInterface() && 2047 clazztype.getEnclosingType().hasTag(CLASS)) { 2048 // Check for the existence of an apropos outer instance 2049 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2050 } 2051 2052 // Attribute constructor arguments. 2053 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2054 final KindSelector pkind = 2055 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2056 List<Type> argtypes = argtypesBuf.toList(); 2057 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2058 2059 // If we have made no mistakes in the class type... 2060 if (clazztype.hasTag(CLASS)) { 2061 // Enums may not be instantiated except implicitly 2062 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2063 (!env.tree.hasTag(VARDEF) || 2064 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2065 ((JCVariableDecl) env.tree).init != tree)) 2066 log.error(tree.pos(), "enum.cant.be.instantiated"); 2067 2068 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2069 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2070 boolean skipNonDiamondPath = false; 2071 // Check that class is not abstract 2072 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2073 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2074 log.error(tree.pos(), "abstract.cant.be.instantiated", 2075 clazztype.tsym); 2076 skipNonDiamondPath = true; 2077 } else if (cdef != null && clazztype.tsym.isInterface()) { 2078 // Check that no constructor arguments are given to 2079 // anonymous classes implementing an interface 2080 if (!argtypes.isEmpty()) 2081 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2082 2083 if (!typeargtypes.isEmpty()) 2084 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2085 2086 // Error recovery: pretend no arguments were supplied. 2087 argtypes = List.nil(); 2088 typeargtypes = List.nil(); 2089 skipNonDiamondPath = true; 2090 } 2091 if (TreeInfo.isDiamond(tree)) { 2092 ClassType site = new ClassType(clazztype.getEnclosingType(), 2093 clazztype.tsym.type.getTypeArguments(), 2094 clazztype.tsym, 2095 clazztype.getMetadata()); 2096 2097 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2098 diamondEnv.info.selectSuper = cdef != null; 2099 diamondEnv.info.pendingResolutionPhase = null; 2100 2101 //if the type of the instance creation expression is a class type 2102 //apply method resolution inference (JLS 15.12.2.7). The return type 2103 //of the resolved constructor will be a partially instantiated type 2104 Symbol constructor = rs.resolveDiamond(tree.pos(), 2105 diamondEnv, 2106 site, 2107 argtypes, 2108 typeargtypes); 2109 tree.constructor = constructor.baseSymbol(); 2110 2111 final TypeSymbol csym = clazztype.tsym; 2112 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2113 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2114 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2115 constructorType = checkId(tree, site, 2116 constructor, 2117 diamondEnv, 2118 diamondResult); 2119 2120 tree.clazz.type = types.createErrorType(clazztype); 2121 if (!constructorType.isErroneous()) { 2122 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2123 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2124 } 2125 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2126 } 2127 2128 // Resolve the called constructor under the assumption 2129 // that we are referring to a superclass instance of the 2130 // current instance (JLS ???). 2131 else if (!skipNonDiamondPath) { 2132 //the following code alters some of the fields in the current 2133 //AttrContext - hence, the current context must be dup'ed in 2134 //order to avoid downstream failures 2135 Env<AttrContext> rsEnv = localEnv.dup(tree); 2136 rsEnv.info.selectSuper = cdef != null; 2137 rsEnv.info.pendingResolutionPhase = null; 2138 tree.constructor = rs.resolveConstructor( 2139 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2140 if (cdef == null) { //do not check twice! 2141 tree.constructorType = checkId(tree, 2142 clazztype, 2143 tree.constructor, 2144 rsEnv, 2145 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2146 if (rsEnv.info.lastResolveVarargs()) 2147 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2148 } 2149 } 2150 2151 if (cdef != null) { 2152 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2153 return; 2154 } 2155 2156 if (tree.constructor != null && tree.constructor.kind == MTH) 2157 owntype = clazztype; 2158 } 2159 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2160 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2161 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2162 //we need to wait for inference to finish and then replace inference vars in the constructor type 2163 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2164 instantiatedContext -> { 2165 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2166 }); 2167 } 2168 chk.validate(tree.typeargs, localEnv); 2169 } 2170 2171 // where 2172 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2173 JCClassDecl cdef, Env<AttrContext> localEnv, 2174 List<Type> argtypes, List<Type> typeargtypes, 2175 KindSelector pkind) { 2176 // We are seeing an anonymous class instance creation. 2177 // In this case, the class instance creation 2178 // expression 2179 // 2180 // E.new <typeargs1>C<typargs2>(args) { ... } 2181 // 2182 // is represented internally as 2183 // 2184 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2185 // 2186 // This expression is then *transformed* as follows: 2187 // 2188 // (1) add an extends or implements clause 2189 // (2) add a constructor. 2190 // 2191 // For instance, if C is a class, and ET is the type of E, 2192 // the expression 2193 // 2194 // E.new <typeargs1>C<typargs2>(args) { ... } 2195 // 2196 // is translated to (where X is a fresh name and typarams is the 2197 // parameter list of the super constructor): 2198 // 2199 // new <typeargs1>X(<*nullchk*>E, args) where 2200 // X extends C<typargs2> { 2201 // <typarams> X(ET e, args) { 2202 // e.<typeargs1>super(args) 2203 // } 2204 // ... 2205 // } 2206 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2207 final boolean isDiamond = TreeInfo.isDiamond(tree); 2208 if (isDiamond 2209 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2210 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2211 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2212 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2213 instantiatedContext -> { 2214 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2215 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2216 ResultInfo prevResult = this.resultInfo; 2217 try { 2218 this.resultInfo = resultInfoForClassDefinition; 2219 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2220 localEnv, argtypes, typeargtypes, pkind); 2221 } finally { 2222 this.resultInfo = prevResult; 2223 } 2224 }); 2225 } else { 2226 if (isDiamond && clazztype.hasTag(CLASS)) { 2227 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2228 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2229 // One or more types inferred in the previous steps is non-denotable. 2230 Fragment fragment = Diamond(clazztype.tsym); 2231 log.error(tree.clazz.pos(), 2232 Errors.CantApplyDiamond1( 2233 fragment, 2234 invalidDiamondArgs.size() > 1 ? 2235 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2236 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2237 } 2238 // For <>(){}, inferred types must also be accessible. 2239 for (Type t : clazztype.getTypeArguments()) { 2240 rs.checkAccessibleType(env, t); 2241 } 2242 } 2243 2244 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2245 // false for isInterface call even when the original type is an interface. 2246 boolean implementing = clazztype.tsym.isInterface() || 2247 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2248 2249 if (implementing) { 2250 cdef.implementing = List.of(clazz); 2251 } else { 2252 cdef.extending = clazz; 2253 } 2254 2255 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2256 isSerializable(clazztype)) { 2257 localEnv.info.isSerializable = true; 2258 } 2259 2260 attribStat(cdef, localEnv); 2261 2262 List<Type> finalargtypes; 2263 // If an outer instance is given, 2264 // prefix it to the constructor arguments 2265 // and delete it from the new expression 2266 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2267 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2268 finalargtypes = argtypes.prepend(tree.encl.type); 2269 tree.encl = null; 2270 } else { 2271 finalargtypes = argtypes; 2272 } 2273 2274 // Reassign clazztype and recompute constructor. As this necessarily involves 2275 // another attribution pass for deferred types in the case of <>, replicate 2276 // them. Original arguments have right decorations already. 2277 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2278 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2279 } 2280 2281 clazztype = cdef.sym.type; 2282 Symbol sym = tree.constructor = rs.resolveConstructor( 2283 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2284 Assert.check(!sym.kind.isResolutionError()); 2285 tree.constructor = sym; 2286 tree.constructorType = checkId(tree, 2287 clazztype, 2288 tree.constructor, 2289 localEnv, 2290 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2291 } 2292 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2293 clazztype : types.createErrorType(tree.type); 2294 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2295 chk.validate(tree.typeargs, localEnv); 2296 } 2297 2298 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2299 return new Check.NestedCheckContext(checkContext) { 2300 @Override 2301 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2302 enclosingContext.report(clazz.clazz, 2303 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2304 } 2305 }; 2306 } 2307 2308 /** Make an attributed null check tree. 2309 */ 2310 public JCExpression makeNullCheck(JCExpression arg) { 2311 // optimization: X.this is never null; skip null check 2312 Name name = TreeInfo.name(arg); 2313 if (name == names._this || name == names._super) return arg; 2314 2315 JCTree.Tag optag = NULLCHK; 2316 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2317 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2318 tree.type = arg.type; 2319 return tree; 2320 } 2321 2322 public void visitNewArray(JCNewArray tree) { 2323 Type owntype = types.createErrorType(tree.type); 2324 Env<AttrContext> localEnv = env.dup(tree); 2325 Type elemtype; 2326 if (tree.elemtype != null) { 2327 elemtype = attribType(tree.elemtype, localEnv); 2328 chk.validate(tree.elemtype, localEnv); 2329 owntype = elemtype; 2330 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2331 attribExpr(l.head, localEnv, syms.intType); 2332 owntype = new ArrayType(owntype, syms.arrayClass); 2333 } 2334 } else { 2335 // we are seeing an untyped aggregate { ... } 2336 // this is allowed only if the prototype is an array 2337 if (pt().hasTag(ARRAY)) { 2338 elemtype = types.elemtype(pt()); 2339 } else { 2340 if (!pt().hasTag(ERROR)) { 2341 log.error(tree.pos(), "illegal.initializer.for.type", 2342 pt()); 2343 } 2344 elemtype = types.createErrorType(pt()); 2345 } 2346 } 2347 if (tree.elems != null) { 2348 attribExprs(tree.elems, localEnv, elemtype); 2349 owntype = new ArrayType(elemtype, syms.arrayClass); 2350 } 2351 if (!types.isReifiable(elemtype)) 2352 log.error(tree.pos(), "generic.array.creation"); 2353 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2354 } 2355 2356 /* 2357 * A lambda expression can only be attributed when a target-type is available. 2358 * In addition, if the target-type is that of a functional interface whose 2359 * descriptor contains inference variables in argument position the lambda expression 2360 * is 'stuck' (see DeferredAttr). 2361 */ 2362 @Override 2363 public void visitLambda(final JCLambda that) { 2364 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2365 if (pt().hasTag(NONE)) { 2366 //lambda only allowed in assignment or method invocation/cast context 2367 log.error(that.pos(), "unexpected.lambda"); 2368 } 2369 result = that.type = types.createErrorType(pt()); 2370 return; 2371 } 2372 //create an environment for attribution of the lambda expression 2373 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2374 boolean needsRecovery = 2375 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2376 try { 2377 if (needsRecovery && isSerializable(pt())) { 2378 localEnv.info.isSerializable = true; 2379 } 2380 List<Type> explicitParamTypes = null; 2381 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2382 //attribute lambda parameters 2383 attribStats(that.params, localEnv); 2384 explicitParamTypes = TreeInfo.types(that.params); 2385 } 2386 2387 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2388 Type currentTarget = targetInfo.target; 2389 Type lambdaType = targetInfo.descriptor; 2390 2391 if (currentTarget.isErroneous()) { 2392 result = that.type = currentTarget; 2393 return; 2394 } 2395 2396 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2397 2398 if (lambdaType.hasTag(FORALL)) { 2399 //lambda expression target desc cannot be a generic method 2400 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2401 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2402 result = that.type = types.createErrorType(pt()); 2403 return; 2404 } 2405 2406 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2407 //add param type info in the AST 2408 List<Type> actuals = lambdaType.getParameterTypes(); 2409 List<JCVariableDecl> params = that.params; 2410 2411 boolean arityMismatch = false; 2412 2413 while (params.nonEmpty()) { 2414 if (actuals.isEmpty()) { 2415 //not enough actuals to perform lambda parameter inference 2416 arityMismatch = true; 2417 } 2418 //reset previously set info 2419 Type argType = arityMismatch ? 2420 syms.errType : 2421 actuals.head; 2422 params.head.vartype = make.at(params.head).Type(argType); 2423 params.head.sym = null; 2424 actuals = actuals.isEmpty() ? 2425 actuals : 2426 actuals.tail; 2427 params = params.tail; 2428 } 2429 2430 //attribute lambda parameters 2431 attribStats(that.params, localEnv); 2432 2433 if (arityMismatch) { 2434 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2435 result = that.type = types.createErrorType(currentTarget); 2436 return; 2437 } 2438 } 2439 2440 //from this point on, no recovery is needed; if we are in assignment context 2441 //we will be able to attribute the whole lambda body, regardless of errors; 2442 //if we are in a 'check' method context, and the lambda is not compatible 2443 //with the target-type, it will be recovered anyway in Attr.checkId 2444 needsRecovery = false; 2445 2446 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2447 lambdaBodyResult(that, lambdaType, resultInfo); 2448 2449 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2450 attribTree(that.getBody(), localEnv, bodyResultInfo); 2451 } else { 2452 JCBlock body = (JCBlock)that.body; 2453 attribStats(body.stats, localEnv); 2454 } 2455 2456 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2457 2458 boolean isSpeculativeRound = 2459 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2460 2461 preFlow(that); 2462 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2463 2464 that.type = currentTarget; //avoids recovery at this stage 2465 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2466 2467 if (!isSpeculativeRound) { 2468 //add thrown types as bounds to the thrown types free variables if needed: 2469 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2470 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2471 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2472 2473 chk.unhandled(inferredThrownTypes, thrownTypes); 2474 } 2475 2476 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2477 } 2478 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2479 } catch (Types.FunctionDescriptorLookupError ex) { 2480 JCDiagnostic cause = ex.getDiagnostic(); 2481 resultInfo.checkContext.report(that, cause); 2482 result = that.type = types.createErrorType(pt()); 2483 return; 2484 } catch (Throwable t) { 2485 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2486 //as that would likely cause the same exception again. 2487 needsRecovery = false; 2488 throw t; 2489 } finally { 2490 localEnv.info.scope.leave(); 2491 if (needsRecovery) { 2492 attribTree(that, env, recoveryInfo); 2493 } 2494 } 2495 } 2496 //where 2497 class TargetInfo { 2498 Type target; 2499 Type descriptor; 2500 2501 public TargetInfo(Type target, Type descriptor) { 2502 this.target = target; 2503 this.descriptor = descriptor; 2504 } 2505 } 2506 2507 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2508 Type lambdaType; 2509 Type currentTarget = resultInfo.pt; 2510 if (resultInfo.pt != Type.recoveryType) { 2511 /* We need to adjust the target. If the target is an 2512 * intersection type, for example: SAM & I1 & I2 ... 2513 * the target will be updated to SAM 2514 */ 2515 currentTarget = targetChecker.visit(currentTarget, that); 2516 if (explicitParamTypes != null) { 2517 currentTarget = infer.instantiateFunctionalInterface(that, 2518 currentTarget, explicitParamTypes, resultInfo.checkContext); 2519 } 2520 currentTarget = types.removeWildcards(currentTarget); 2521 lambdaType = types.findDescriptorType(currentTarget); 2522 } else { 2523 currentTarget = Type.recoveryType; 2524 lambdaType = fallbackDescriptorType(that); 2525 } 2526 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2527 //lambda expression target desc cannot be a generic method 2528 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2529 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2530 currentTarget = types.createErrorType(pt()); 2531 } 2532 return new TargetInfo(currentTarget, lambdaType); 2533 } 2534 2535 void preFlow(JCLambda tree) { 2536 new PostAttrAnalyzer() { 2537 @Override 2538 public void scan(JCTree tree) { 2539 if (tree == null || 2540 (tree.type != null && 2541 tree.type == Type.stuckType)) { 2542 //don't touch stuck expressions! 2543 return; 2544 } 2545 super.scan(tree); 2546 } 2547 }.scan(tree); 2548 } 2549 2550 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2551 2552 @Override 2553 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2554 return t.isIntersection() ? 2555 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2556 } 2557 2558 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2559 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2560 Type target = null; 2561 for (Type bound : ict.getExplicitComponents()) { 2562 TypeSymbol boundSym = bound.tsym; 2563 if (types.isFunctionalInterface(boundSym) && 2564 types.findDescriptorSymbol(boundSym) == desc) { 2565 target = bound; 2566 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2567 //bound must be an interface 2568 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2569 } 2570 } 2571 return target != null ? 2572 target : 2573 ict.getExplicitComponents().head; //error recovery 2574 } 2575 2576 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2577 ListBuffer<Type> targs = new ListBuffer<>(); 2578 ListBuffer<Type> supertypes = new ListBuffer<>(); 2579 for (Type i : ict.interfaces_field) { 2580 if (i.isParameterized()) { 2581 targs.appendList(i.tsym.type.allparams()); 2582 } 2583 supertypes.append(i.tsym.type); 2584 } 2585 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2586 notionalIntf.allparams_field = targs.toList(); 2587 notionalIntf.tsym.flags_field |= INTERFACE; 2588 return notionalIntf.tsym; 2589 } 2590 2591 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2592 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2593 diags.fragment(key, args))); 2594 } 2595 }; 2596 2597 private Type fallbackDescriptorType(JCExpression tree) { 2598 switch (tree.getTag()) { 2599 case LAMBDA: 2600 JCLambda lambda = (JCLambda)tree; 2601 List<Type> argtypes = List.nil(); 2602 for (JCVariableDecl param : lambda.params) { 2603 argtypes = param.vartype != null ? 2604 argtypes.append(param.vartype.type) : 2605 argtypes.append(syms.errType); 2606 } 2607 return new MethodType(argtypes, Type.recoveryType, 2608 List.of(syms.throwableType), syms.methodClass); 2609 case REFERENCE: 2610 return new MethodType(List.<Type>nil(), Type.recoveryType, 2611 List.of(syms.throwableType), syms.methodClass); 2612 default: 2613 Assert.error("Cannot get here!"); 2614 } 2615 return null; 2616 } 2617 2618 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2619 final InferenceContext inferenceContext, final Type... ts) { 2620 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2621 } 2622 2623 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2624 final InferenceContext inferenceContext, final List<Type> ts) { 2625 if (inferenceContext.free(ts)) { 2626 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() { 2627 @Override 2628 public void typesInferred(InferenceContext inferenceContext) { 2629 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts)); 2630 } 2631 }); 2632 } else { 2633 for (Type t : ts) { 2634 rs.checkAccessibleType(env, t); 2635 } 2636 } 2637 } 2638 2639 /** 2640 * Lambda/method reference have a special check context that ensures 2641 * that i.e. a lambda return type is compatible with the expected 2642 * type according to both the inherited context and the assignment 2643 * context. 2644 */ 2645 class FunctionalReturnContext extends Check.NestedCheckContext { 2646 2647 FunctionalReturnContext(CheckContext enclosingContext) { 2648 super(enclosingContext); 2649 } 2650 2651 @Override 2652 public boolean compatible(Type found, Type req, Warner warn) { 2653 //return type must be compatible in both current context and assignment context 2654 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn); 2655 } 2656 2657 @Override 2658 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2659 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2660 } 2661 } 2662 2663 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2664 2665 JCExpression expr; 2666 2667 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2668 super(enclosingContext); 2669 this.expr = expr; 2670 } 2671 2672 @Override 2673 public boolean compatible(Type found, Type req, Warner warn) { 2674 //a void return is compatible with an expression statement lambda 2675 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) || 2676 super.compatible(found, req, warn); 2677 } 2678 } 2679 2680 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2681 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2682 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2683 new FunctionalReturnContext(resultInfo.checkContext); 2684 2685 return descriptor.getReturnType() == Type.recoveryType ? 2686 recoveryInfo : 2687 new ResultInfo(KindSelector.VAL, 2688 descriptor.getReturnType(), funcContext); 2689 } 2690 2691 /** 2692 * Lambda compatibility. Check that given return types, thrown types, parameter types 2693 * are compatible with the expected functional interface descriptor. This means that: 2694 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2695 * types must be compatible with the return type of the expected descriptor. 2696 */ 2697 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2698 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2699 2700 //return values have already been checked - but if lambda has no return 2701 //values, we must ensure that void/value compatibility is correct; 2702 //this amounts at checking that, if a lambda body can complete normally, 2703 //the descriptor's return type must be void 2704 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2705 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2706 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2707 diags.fragment("missing.ret.val", returnType))); 2708 } 2709 2710 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2711 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2712 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2713 } 2714 } 2715 2716 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2717 * static field and that lambda has type annotations, these annotations will 2718 * also be stored at these fake clinit methods. 2719 * 2720 * LambdaToMethod also use fake clinit methods so they can be reused. 2721 * Also as LTM is a phase subsequent to attribution, the methods from 2722 * clinits can be safely removed by LTM to save memory. 2723 */ 2724 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2725 2726 public MethodSymbol removeClinit(ClassSymbol sym) { 2727 return clinits.remove(sym); 2728 } 2729 2730 /* This method returns an environment to be used to attribute a lambda 2731 * expression. 2732 * 2733 * The owner of this environment is a method symbol. If the current owner 2734 * is not a method, for example if the lambda is used to initialize 2735 * a field, then if the field is: 2736 * 2737 * - an instance field, we use the first constructor. 2738 * - a static field, we create a fake clinit method. 2739 */ 2740 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2741 Env<AttrContext> lambdaEnv; 2742 Symbol owner = env.info.scope.owner; 2743 if (owner.kind == VAR && owner.owner.kind == TYP) { 2744 //field initializer 2745 ClassSymbol enclClass = owner.enclClass(); 2746 Symbol newScopeOwner = env.info.scope.owner; 2747 /* if the field isn't static, then we can get the first constructor 2748 * and use it as the owner of the environment. This is what 2749 * LTM code is doing to look for type annotations so we are fine. 2750 */ 2751 if ((owner.flags() & STATIC) == 0) { 2752 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2753 newScopeOwner = s; 2754 break; 2755 } 2756 } else { 2757 /* if the field is static then we need to create a fake clinit 2758 * method, this method can later be reused by LTM. 2759 */ 2760 MethodSymbol clinit = clinits.get(enclClass); 2761 if (clinit == null) { 2762 Type clinitType = new MethodType(List.<Type>nil(), 2763 syms.voidType, List.<Type>nil(), syms.methodClass); 2764 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2765 names.clinit, clinitType, enclClass); 2766 clinit.params = List.<VarSymbol>nil(); 2767 clinits.put(enclClass, clinit); 2768 } 2769 newScopeOwner = clinit; 2770 } 2771 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2772 } else { 2773 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2774 } 2775 return lambdaEnv; 2776 } 2777 2778 @Override 2779 public void visitReference(final JCMemberReference that) { 2780 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2781 if (pt().hasTag(NONE)) { 2782 //method reference only allowed in assignment or method invocation/cast context 2783 log.error(that.pos(), "unexpected.mref"); 2784 } 2785 result = that.type = types.createErrorType(pt()); 2786 return; 2787 } 2788 final Env<AttrContext> localEnv = env.dup(that); 2789 try { 2790 //attribute member reference qualifier - if this is a constructor 2791 //reference, the expected kind must be a type 2792 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2793 2794 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2795 exprType = chk.checkConstructorRefType(that.expr, exprType); 2796 if (!exprType.isErroneous() && 2797 exprType.isRaw() && 2798 that.typeargs != null) { 2799 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2800 diags.fragment("mref.infer.and.explicit.params")); 2801 exprType = types.createErrorType(exprType); 2802 } 2803 } 2804 2805 if (exprType.isErroneous()) { 2806 //if the qualifier expression contains problems, 2807 //give up attribution of method reference 2808 result = that.type = exprType; 2809 return; 2810 } 2811 2812 if (TreeInfo.isStaticSelector(that.expr, names)) { 2813 //if the qualifier is a type, validate it; raw warning check is 2814 //omitted as we don't know at this stage as to whether this is a 2815 //raw selector (because of inference) 2816 chk.validate(that.expr, env, false); 2817 } else { 2818 Symbol lhsSym = TreeInfo.symbol(that.expr); 2819 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2820 } 2821 //attrib type-arguments 2822 List<Type> typeargtypes = List.nil(); 2823 if (that.typeargs != null) { 2824 typeargtypes = attribTypes(that.typeargs, localEnv); 2825 } 2826 2827 boolean isTargetSerializable = 2828 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2829 isSerializable(pt()); 2830 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2831 Type currentTarget = targetInfo.target; 2832 Type desc = targetInfo.descriptor; 2833 2834 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2835 List<Type> argtypes = desc.getParameterTypes(); 2836 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2837 2838 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2839 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2840 } 2841 2842 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2843 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2844 try { 2845 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2846 that.name, argtypes, typeargtypes, referenceCheck, 2847 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2848 } finally { 2849 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2850 } 2851 2852 Symbol refSym = refResult.fst; 2853 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2854 2855 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2856 * JDK-8075541 2857 */ 2858 if (refSym.kind != MTH) { 2859 boolean targetError; 2860 switch (refSym.kind) { 2861 case ABSENT_MTH: 2862 case MISSING_ENCL: 2863 targetError = false; 2864 break; 2865 case WRONG_MTH: 2866 case WRONG_MTHS: 2867 case AMBIGUOUS: 2868 case HIDDEN: 2869 case STATICERR: 2870 targetError = true; 2871 break; 2872 default: 2873 Assert.error("unexpected result kind " + refSym.kind); 2874 targetError = false; 2875 } 2876 2877 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2878 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2879 2880 JCDiagnostic.DiagnosticType diagKind = targetError ? 2881 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2882 2883 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2884 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2885 2886 if (targetError && currentTarget == Type.recoveryType) { 2887 //a target error doesn't make sense during recovery stage 2888 //as we don't know what actual parameter types are 2889 result = that.type = currentTarget; 2890 return; 2891 } else { 2892 if (targetError) { 2893 resultInfo.checkContext.report(that, diag); 2894 } else { 2895 log.report(diag); 2896 } 2897 result = that.type = types.createErrorType(currentTarget); 2898 return; 2899 } 2900 } 2901 2902 that.sym = refSym.baseSymbol(); 2903 that.kind = lookupHelper.referenceKind(that.sym); 2904 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2905 2906 if (desc.getReturnType() == Type.recoveryType) { 2907 // stop here 2908 result = that.type = currentTarget; 2909 return; 2910 } 2911 2912 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2913 2914 if (that.getMode() == ReferenceMode.INVOKE && 2915 TreeInfo.isStaticSelector(that.expr, names) && 2916 that.kind.isUnbound() && 2917 !desc.getParameterTypes().head.isParameterized()) { 2918 chk.checkRaw(that.expr, localEnv); 2919 } 2920 2921 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2922 exprType.getTypeArguments().nonEmpty()) { 2923 //static ref with class type-args 2924 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2925 diags.fragment("static.mref.with.targs")); 2926 result = that.type = types.createErrorType(currentTarget); 2927 return; 2928 } 2929 2930 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2931 // Check that super-qualified symbols are not abstract (JLS) 2932 rs.checkNonAbstract(that.pos(), that.sym); 2933 } 2934 2935 if (isTargetSerializable) { 2936 chk.checkElemAccessFromSerializableLambda(that); 2937 } 2938 } 2939 2940 ResultInfo checkInfo = 2941 resultInfo.dup(newMethodTemplate( 2942 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2943 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2944 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2945 2946 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 2947 2948 if (that.kind.isUnbound() && 2949 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2950 //re-generate inference constraints for unbound receiver 2951 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 2952 //cannot happen as this has already been checked - we just need 2953 //to regenerate the inference constraints, as that has been lost 2954 //as a result of the call to inferenceContext.save() 2955 Assert.error("Can't get here"); 2956 } 2957 } 2958 2959 if (!refType.isErroneous()) { 2960 refType = types.createMethodTypeWithReturn(refType, 2961 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 2962 } 2963 2964 //go ahead with standard method reference compatibility check - note that param check 2965 //is a no-op (as this has been taken care during method applicability) 2966 boolean isSpeculativeRound = 2967 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2968 2969 that.type = currentTarget; //avoids recovery at this stage 2970 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 2971 if (!isSpeculativeRound) { 2972 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 2973 } 2974 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2975 } catch (Types.FunctionDescriptorLookupError ex) { 2976 JCDiagnostic cause = ex.getDiagnostic(); 2977 resultInfo.checkContext.report(that, cause); 2978 result = that.type = types.createErrorType(pt()); 2979 return; 2980 } 2981 } 2982 //where 2983 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 2984 //if this is a constructor reference, the expected kind must be a type 2985 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 2986 KindSelector.VAL_TYP : KindSelector.TYP, 2987 Type.noType); 2988 } 2989 2990 2991 @SuppressWarnings("fallthrough") 2992 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 2993 InferenceContext inferenceContext = checkContext.inferenceContext(); 2994 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 2995 2996 Type resType; 2997 switch (tree.getMode()) { 2998 case NEW: 2999 if (!tree.expr.type.isRaw()) { 3000 resType = tree.expr.type; 3001 break; 3002 } 3003 default: 3004 resType = refType.getReturnType(); 3005 } 3006 3007 Type incompatibleReturnType = resType; 3008 3009 if (returnType.hasTag(VOID)) { 3010 incompatibleReturnType = null; 3011 } 3012 3013 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3014 if (resType.isErroneous() || 3015 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) { 3016 incompatibleReturnType = null; 3017 } 3018 } 3019 3020 if (incompatibleReturnType != null) { 3021 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3022 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3023 } else { 3024 if (inferenceContext.free(refType)) { 3025 // we need to wait for inference to finish and then replace inference vars in the referent type 3026 inferenceContext.addFreeTypeListener(List.of(refType), 3027 instantiatedContext -> { 3028 tree.referentType = instantiatedContext.asInstType(refType); 3029 }); 3030 } else { 3031 tree.referentType = refType; 3032 } 3033 } 3034 3035 if (!speculativeAttr) { 3036 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3037 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3038 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3039 } 3040 } 3041 } 3042 3043 /** 3044 * Set functional type info on the underlying AST. Note: as the target descriptor 3045 * might contain inference variables, we might need to register an hook in the 3046 * current inference context. 3047 */ 3048 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3049 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3050 if (checkContext.inferenceContext().free(descriptorType)) { 3051 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() { 3052 public void typesInferred(InferenceContext inferenceContext) { 3053 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3054 inferenceContext.asInstType(primaryTarget), checkContext); 3055 } 3056 }); 3057 } else { 3058 ListBuffer<Type> targets = new ListBuffer<>(); 3059 if (pt.hasTag(CLASS)) { 3060 if (pt.isCompound()) { 3061 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3062 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3063 if (t != primaryTarget) { 3064 targets.append(types.removeWildcards(t)); 3065 } 3066 } 3067 } else { 3068 targets.append(types.removeWildcards(primaryTarget)); 3069 } 3070 } 3071 fExpr.targets = targets.toList(); 3072 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3073 pt != Type.recoveryType) { 3074 //check that functional interface class is well-formed 3075 try { 3076 /* Types.makeFunctionalInterfaceClass() may throw an exception 3077 * when it's executed post-inference. See the listener code 3078 * above. 3079 */ 3080 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3081 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3082 if (csym != null) { 3083 chk.checkImplementations(env.tree, csym, csym); 3084 try { 3085 //perform an additional functional interface check on the synthetic class, 3086 //as there may be spurious errors for raw targets - because of existing issues 3087 //with membership and inheritance (see JDK-8074570). 3088 csym.flags_field |= INTERFACE; 3089 types.findDescriptorType(csym.type); 3090 } catch (FunctionDescriptorLookupError err) { 3091 resultInfo.checkContext.report(fExpr, 3092 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3093 } 3094 } 3095 } catch (Types.FunctionDescriptorLookupError ex) { 3096 JCDiagnostic cause = ex.getDiagnostic(); 3097 resultInfo.checkContext.report(env.tree, cause); 3098 } 3099 } 3100 } 3101 } 3102 3103 public void visitParens(JCParens tree) { 3104 Type owntype = attribTree(tree.expr, env, resultInfo); 3105 result = check(tree, owntype, pkind(), resultInfo); 3106 Symbol sym = TreeInfo.symbol(tree); 3107 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3108 log.error(tree.pos(), "illegal.start.of.type"); 3109 } 3110 3111 public void visitAssign(JCAssign tree) { 3112 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3113 Type capturedType = capture(owntype); 3114 attribExpr(tree.rhs, env, owntype); 3115 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3116 } 3117 3118 public void visitAssignop(JCAssignOp tree) { 3119 // Attribute arguments. 3120 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3121 Type operand = attribExpr(tree.rhs, env); 3122 // Find operator. 3123 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3124 if (operator.kind == MTH && 3125 !owntype.isErroneous() && 3126 !operand.isErroneous()) { 3127 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3128 chk.checkCastable(tree.rhs.pos(), 3129 operator.type.getReturnType(), 3130 owntype); 3131 } 3132 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3133 } 3134 3135 public void visitUnary(JCUnary tree) { 3136 // Attribute arguments. 3137 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3138 ? attribTree(tree.arg, env, varAssignmentInfo) 3139 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3140 3141 // Find operator. 3142 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3143 Type owntype = types.createErrorType(tree.type); 3144 if (operator.kind == MTH && 3145 !argtype.isErroneous()) { 3146 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3147 ? tree.arg.type 3148 : operator.type.getReturnType(); 3149 int opc = ((OperatorSymbol)operator).opcode; 3150 3151 // If the argument is constant, fold it. 3152 if (argtype.constValue() != null) { 3153 Type ctype = cfolder.fold1(opc, argtype); 3154 if (ctype != null) { 3155 owntype = cfolder.coerce(ctype, owntype); 3156 } 3157 } 3158 } 3159 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3160 } 3161 3162 public void visitBinary(JCBinary tree) { 3163 // Attribute arguments. 3164 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3165 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3166 // Find operator. 3167 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3168 Type owntype = types.createErrorType(tree.type); 3169 if (operator.kind == MTH && 3170 !left.isErroneous() && 3171 !right.isErroneous()) { 3172 owntype = operator.type.getReturnType(); 3173 int opc = ((OperatorSymbol)operator).opcode; 3174 // If both arguments are constants, fold them. 3175 if (left.constValue() != null && right.constValue() != null) { 3176 Type ctype = cfolder.fold2(opc, left, right); 3177 if (ctype != null) { 3178 owntype = cfolder.coerce(ctype, owntype); 3179 } 3180 } 3181 3182 // Check that argument types of a reference ==, != are 3183 // castable to each other, (JLS 15.21). Note: unboxing 3184 // comparisons will not have an acmp* opc at this point. 3185 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3186 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3187 log.error(tree.pos(), "incomparable.types", left, right); 3188 } 3189 } 3190 3191 chk.checkDivZero(tree.rhs.pos(), operator, right); 3192 } 3193 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3194 } 3195 3196 public void visitTypeCast(final JCTypeCast tree) { 3197 Type clazztype = attribType(tree.clazz, env); 3198 chk.validate(tree.clazz, env, false); 3199 //a fresh environment is required for 292 inference to work properly --- 3200 //see Infer.instantiatePolymorphicSignatureInstance() 3201 Env<AttrContext> localEnv = env.dup(tree); 3202 //should we propagate the target type? 3203 final ResultInfo castInfo; 3204 JCExpression expr = TreeInfo.skipParens(tree.expr); 3205 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3206 if (isPoly) { 3207 //expression is a poly - we need to propagate target type info 3208 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3209 new Check.NestedCheckContext(resultInfo.checkContext) { 3210 @Override 3211 public boolean compatible(Type found, Type req, Warner warn) { 3212 return types.isCastable(found, req, warn); 3213 } 3214 }); 3215 } else { 3216 //standalone cast - target-type info is not propagated 3217 castInfo = unknownExprInfo; 3218 } 3219 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3220 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3221 if (exprtype.constValue() != null) 3222 owntype = cfolder.coerce(exprtype, owntype); 3223 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3224 if (!isPoly) 3225 chk.checkRedundantCast(localEnv, tree); 3226 } 3227 3228 public void visitTypeTest(JCInstanceOf tree) { 3229 Type exprtype = chk.checkNullOrRefType( 3230 tree.expr.pos(), attribExpr(tree.expr, env)); 3231 Type clazztype = attribType(tree.clazz, env); 3232 if (!clazztype.hasTag(TYPEVAR)) { 3233 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3234 } 3235 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3236 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3237 clazztype = types.createErrorType(clazztype); 3238 } 3239 chk.validate(tree.clazz, env, false); 3240 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3241 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3242 } 3243 3244 public void visitIndexed(JCArrayAccess tree) { 3245 Type owntype = types.createErrorType(tree.type); 3246 Type atype = attribExpr(tree.indexed, env); 3247 attribExpr(tree.index, env, syms.intType); 3248 if (types.isArray(atype)) 3249 owntype = types.elemtype(atype); 3250 else if (!atype.hasTag(ERROR)) 3251 log.error(tree.pos(), "array.req.but.found", atype); 3252 if (!pkind().contains(KindSelector.VAL)) 3253 owntype = capture(owntype); 3254 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3255 } 3256 3257 public void visitIdent(JCIdent tree) { 3258 Symbol sym; 3259 3260 // Find symbol 3261 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3262 // If we are looking for a method, the prototype `pt' will be a 3263 // method type with the type of the call's arguments as parameters. 3264 env.info.pendingResolutionPhase = null; 3265 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3266 } else if (tree.sym != null && tree.sym.kind != VAR) { 3267 sym = tree.sym; 3268 } else { 3269 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3270 } 3271 tree.sym = sym; 3272 3273 // (1) Also find the environment current for the class where 3274 // sym is defined (`symEnv'). 3275 // Only for pre-tiger versions (1.4 and earlier): 3276 // (2) Also determine whether we access symbol out of an anonymous 3277 // class in a this or super call. This is illegal for instance 3278 // members since such classes don't carry a this$n link. 3279 // (`noOuterThisPath'). 3280 Env<AttrContext> symEnv = env; 3281 boolean noOuterThisPath = false; 3282 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3283 sym.kind.matches(KindSelector.VAL_MTH) && 3284 sym.owner.kind == TYP && 3285 tree.name != names._this && tree.name != names._super) { 3286 3287 // Find environment in which identifier is defined. 3288 while (symEnv.outer != null && 3289 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3290 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3291 noOuterThisPath = false; 3292 symEnv = symEnv.outer; 3293 } 3294 } 3295 3296 // If symbol is a variable, ... 3297 if (sym.kind == VAR) { 3298 VarSymbol v = (VarSymbol)sym; 3299 3300 // ..., evaluate its initializer, if it has one, and check for 3301 // illegal forward reference. 3302 checkInit(tree, env, v, false); 3303 3304 // If we are expecting a variable (as opposed to a value), check 3305 // that the variable is assignable in the current environment. 3306 if (KindSelector.ASG.subset(pkind())) 3307 checkAssignable(tree.pos(), v, null, env); 3308 } 3309 3310 // In a constructor body, 3311 // if symbol is a field or instance method, check that it is 3312 // not accessed before the supertype constructor is called. 3313 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3314 sym.kind.matches(KindSelector.VAL_MTH) && 3315 sym.owner.kind == TYP && 3316 (sym.flags() & STATIC) == 0) { 3317 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3318 sym : thisSym(tree.pos(), env)); 3319 } 3320 Env<AttrContext> env1 = env; 3321 if (sym.kind != ERR && sym.kind != TYP && 3322 sym.owner != null && sym.owner != env1.enclClass.sym) { 3323 // If the found symbol is inaccessible, then it is 3324 // accessed through an enclosing instance. Locate this 3325 // enclosing instance: 3326 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3327 env1 = env1.outer; 3328 } 3329 3330 if (env.info.isSerializable) { 3331 chk.checkElemAccessFromSerializableLambda(tree); 3332 } 3333 3334 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3335 } 3336 3337 public void visitSelect(JCFieldAccess tree) { 3338 // Determine the expected kind of the qualifier expression. 3339 KindSelector skind = KindSelector.NIL; 3340 if (tree.name == names._this || tree.name == names._super || 3341 tree.name == names._class) 3342 { 3343 skind = KindSelector.TYP; 3344 } else { 3345 if (pkind().contains(KindSelector.PCK)) 3346 skind = KindSelector.of(skind, KindSelector.PCK); 3347 if (pkind().contains(KindSelector.TYP)) 3348 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3349 if (pkind().contains(KindSelector.VAL_MTH)) 3350 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3351 } 3352 3353 // Attribute the qualifier expression, and determine its symbol (if any). 3354 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3355 if (!pkind().contains(KindSelector.TYP_PCK)) 3356 site = capture(site); // Capture field access 3357 3358 // don't allow T.class T[].class, etc 3359 if (skind == KindSelector.TYP) { 3360 Type elt = site; 3361 while (elt.hasTag(ARRAY)) 3362 elt = ((ArrayType)elt).elemtype; 3363 if (elt.hasTag(TYPEVAR)) { 3364 log.error(tree.pos(), "type.var.cant.be.deref"); 3365 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3366 tree.sym = tree.type.tsym; 3367 return ; 3368 } 3369 } 3370 3371 // If qualifier symbol is a type or `super', assert `selectSuper' 3372 // for the selection. This is relevant for determining whether 3373 // protected symbols are accessible. 3374 Symbol sitesym = TreeInfo.symbol(tree.selected); 3375 boolean selectSuperPrev = env.info.selectSuper; 3376 env.info.selectSuper = 3377 sitesym != null && 3378 sitesym.name == names._super; 3379 3380 // Determine the symbol represented by the selection. 3381 env.info.pendingResolutionPhase = null; 3382 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3383 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3384 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3385 sym = syms.errSymbol; 3386 } 3387 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3388 site = capture(site); 3389 sym = selectSym(tree, sitesym, site, env, resultInfo); 3390 } 3391 boolean varArgs = env.info.lastResolveVarargs(); 3392 tree.sym = sym; 3393 3394 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3395 site = types.skipTypeVars(site, true); 3396 } 3397 3398 // If that symbol is a variable, ... 3399 if (sym.kind == VAR) { 3400 VarSymbol v = (VarSymbol)sym; 3401 3402 // ..., evaluate its initializer, if it has one, and check for 3403 // illegal forward reference. 3404 checkInit(tree, env, v, true); 3405 3406 // If we are expecting a variable (as opposed to a value), check 3407 // that the variable is assignable in the current environment. 3408 if (KindSelector.ASG.subset(pkind())) 3409 checkAssignable(tree.pos(), v, tree.selected, env); 3410 } 3411 3412 if (sitesym != null && 3413 sitesym.kind == VAR && 3414 ((VarSymbol)sitesym).isResourceVariable() && 3415 sym.kind == MTH && 3416 sym.name.equals(names.close) && 3417 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3418 env.info.lint.isEnabled(LintCategory.TRY)) { 3419 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3420 } 3421 3422 // Disallow selecting a type from an expression 3423 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3424 tree.type = check(tree.selected, pt(), 3425 sitesym == null ? 3426 KindSelector.VAL : sitesym.kind.toSelector(), 3427 new ResultInfo(KindSelector.TYP_PCK, pt())); 3428 } 3429 3430 if (isType(sitesym)) { 3431 if (sym.name == names._this) { 3432 // If `C' is the currently compiled class, check that 3433 // C.this' does not appear in a call to a super(...) 3434 if (env.info.isSelfCall && 3435 site.tsym == env.enclClass.sym) { 3436 chk.earlyRefError(tree.pos(), sym); 3437 } 3438 } else { 3439 // Check if type-qualified fields or methods are static (JLS) 3440 if ((sym.flags() & STATIC) == 0 && 3441 !env.next.tree.hasTag(REFERENCE) && 3442 sym.name != names._super && 3443 (sym.kind == VAR || sym.kind == MTH)) { 3444 rs.accessBase(rs.new StaticError(sym), 3445 tree.pos(), site, sym.name, true); 3446 } 3447 } 3448 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3449 sym.isStatic() && sym.kind == MTH) { 3450 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3451 } 3452 } else if (sym.kind != ERR && 3453 (sym.flags() & STATIC) != 0 && 3454 sym.name != names._class) { 3455 // If the qualified item is not a type and the selected item is static, report 3456 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3457 chk.warnStatic(tree, "static.not.qualified.by.type", 3458 sym.kind.kindName(), sym.owner); 3459 } 3460 3461 // If we are selecting an instance member via a `super', ... 3462 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3463 3464 // Check that super-qualified symbols are not abstract (JLS) 3465 rs.checkNonAbstract(tree.pos(), sym); 3466 3467 if (site.isRaw()) { 3468 // Determine argument types for site. 3469 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3470 if (site1 != null) site = site1; 3471 } 3472 } 3473 3474 if (env.info.isSerializable) { 3475 chk.checkElemAccessFromSerializableLambda(tree); 3476 } 3477 3478 env.info.selectSuper = selectSuperPrev; 3479 result = checkId(tree, site, sym, env, resultInfo); 3480 } 3481 //where 3482 /** Determine symbol referenced by a Select expression, 3483 * 3484 * @param tree The select tree. 3485 * @param site The type of the selected expression, 3486 * @param env The current environment. 3487 * @param resultInfo The current result. 3488 */ 3489 private Symbol selectSym(JCFieldAccess tree, 3490 Symbol location, 3491 Type site, 3492 Env<AttrContext> env, 3493 ResultInfo resultInfo) { 3494 DiagnosticPosition pos = tree.pos(); 3495 Name name = tree.name; 3496 switch (site.getTag()) { 3497 case PACKAGE: 3498 return rs.accessBase( 3499 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3500 pos, location, site, name, true); 3501 case ARRAY: 3502 case CLASS: 3503 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3504 return rs.resolveQualifiedMethod( 3505 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3506 } else if (name == names._this || name == names._super) { 3507 return rs.resolveSelf(pos, env, site.tsym, name); 3508 } else if (name == names._class) { 3509 // In this case, we have already made sure in 3510 // visitSelect that qualifier expression is a type. 3511 Type t = syms.classType; 3512 List<Type> typeargs = List.of(types.erasure(site)); 3513 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3514 return new VarSymbol( 3515 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3516 } else { 3517 // We are seeing a plain identifier as selector. 3518 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3519 sym = rs.accessBase(sym, pos, location, site, name, true); 3520 return sym; 3521 } 3522 case WILDCARD: 3523 throw new AssertionError(tree); 3524 case TYPEVAR: 3525 // Normally, site.getUpperBound() shouldn't be null. 3526 // It should only happen during memberEnter/attribBase 3527 // when determining the super type which *must* beac 3528 // done before attributing the type variables. In 3529 // other words, we are seeing this illegal program: 3530 // class B<T> extends A<T.foo> {} 3531 Symbol sym = (site.getUpperBound() != null) 3532 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3533 : null; 3534 if (sym == null) { 3535 log.error(pos, "type.var.cant.be.deref"); 3536 return syms.errSymbol; 3537 } else { 3538 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3539 rs.new AccessError(env, site, sym) : 3540 sym; 3541 rs.accessBase(sym2, pos, location, site, name, true); 3542 return sym; 3543 } 3544 case ERROR: 3545 // preserve identifier names through errors 3546 return types.createErrorType(name, site.tsym, site).tsym; 3547 default: 3548 // The qualifier expression is of a primitive type -- only 3549 // .class is allowed for these. 3550 if (name == names._class) { 3551 // In this case, we have already made sure in Select that 3552 // qualifier expression is a type. 3553 Type t = syms.classType; 3554 Type arg = types.boxedClass(site).type; 3555 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3556 return new VarSymbol( 3557 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3558 } else { 3559 log.error(pos, "cant.deref", site); 3560 return syms.errSymbol; 3561 } 3562 } 3563 } 3564 3565 /** Determine type of identifier or select expression and check that 3566 * (1) the referenced symbol is not deprecated 3567 * (2) the symbol's type is safe (@see checkSafe) 3568 * (3) if symbol is a variable, check that its type and kind are 3569 * compatible with the prototype and protokind. 3570 * (4) if symbol is an instance field of a raw type, 3571 * which is being assigned to, issue an unchecked warning if its 3572 * type changes under erasure. 3573 * (5) if symbol is an instance method of a raw type, issue an 3574 * unchecked warning if its argument types change under erasure. 3575 * If checks succeed: 3576 * If symbol is a constant, return its constant type 3577 * else if symbol is a method, return its result type 3578 * otherwise return its type. 3579 * Otherwise return errType. 3580 * 3581 * @param tree The syntax tree representing the identifier 3582 * @param site If this is a select, the type of the selected 3583 * expression, otherwise the type of the current class. 3584 * @param sym The symbol representing the identifier. 3585 * @param env The current environment. 3586 * @param resultInfo The expected result 3587 */ 3588 Type checkId(JCTree tree, 3589 Type site, 3590 Symbol sym, 3591 Env<AttrContext> env, 3592 ResultInfo resultInfo) { 3593 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3594 checkMethodId(tree, site, sym, env, resultInfo) : 3595 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3596 } 3597 3598 Type checkMethodId(JCTree tree, 3599 Type site, 3600 Symbol sym, 3601 Env<AttrContext> env, 3602 ResultInfo resultInfo) { 3603 boolean isPolymorhicSignature = 3604 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3605 return isPolymorhicSignature ? 3606 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3607 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3608 } 3609 3610 Type checkSigPolyMethodId(JCTree tree, 3611 Type site, 3612 Symbol sym, 3613 Env<AttrContext> env, 3614 ResultInfo resultInfo) { 3615 //recover original symbol for signature polymorphic methods 3616 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3617 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3618 return sym.type; 3619 } 3620 3621 Type checkMethodIdInternal(JCTree tree, 3622 Type site, 3623 Symbol sym, 3624 Env<AttrContext> env, 3625 ResultInfo resultInfo) { 3626 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3627 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3628 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3629 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3630 return owntype; 3631 } else { 3632 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3633 } 3634 } 3635 3636 Type checkIdInternal(JCTree tree, 3637 Type site, 3638 Symbol sym, 3639 Type pt, 3640 Env<AttrContext> env, 3641 ResultInfo resultInfo) { 3642 if (pt.isErroneous()) { 3643 return types.createErrorType(site); 3644 } 3645 Type owntype; // The computed type of this identifier occurrence. 3646 switch (sym.kind) { 3647 case TYP: 3648 // For types, the computed type equals the symbol's type, 3649 // except for two situations: 3650 owntype = sym.type; 3651 if (owntype.hasTag(CLASS)) { 3652 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3653 Type ownOuter = owntype.getEnclosingType(); 3654 3655 // (a) If the symbol's type is parameterized, erase it 3656 // because no type parameters were given. 3657 // We recover generic outer type later in visitTypeApply. 3658 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3659 owntype = types.erasure(owntype); 3660 } 3661 3662 // (b) If the symbol's type is an inner class, then 3663 // we have to interpret its outer type as a superclass 3664 // of the site type. Example: 3665 // 3666 // class Tree<A> { class Visitor { ... } } 3667 // class PointTree extends Tree<Point> { ... } 3668 // ...PointTree.Visitor... 3669 // 3670 // Then the type of the last expression above is 3671 // Tree<Point>.Visitor. 3672 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3673 Type normOuter = site; 3674 if (normOuter.hasTag(CLASS)) { 3675 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3676 } 3677 if (normOuter == null) // perhaps from an import 3678 normOuter = types.erasure(ownOuter); 3679 if (normOuter != ownOuter) 3680 owntype = new ClassType( 3681 normOuter, List.<Type>nil(), owntype.tsym, 3682 owntype.getMetadata()); 3683 } 3684 } 3685 break; 3686 case VAR: 3687 VarSymbol v = (VarSymbol)sym; 3688 // Test (4): if symbol is an instance field of a raw type, 3689 // which is being assigned to, issue an unchecked warning if 3690 // its type changes under erasure. 3691 if (KindSelector.ASG.subset(pkind()) && 3692 v.owner.kind == TYP && 3693 (v.flags() & STATIC) == 0 && 3694 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3695 Type s = types.asOuterSuper(site, v.owner); 3696 if (s != null && 3697 s.isRaw() && 3698 !types.isSameType(v.type, v.erasure(types))) { 3699 chk.warnUnchecked(tree.pos(), 3700 "unchecked.assign.to.var", 3701 v, s); 3702 } 3703 } 3704 // The computed type of a variable is the type of the 3705 // variable symbol, taken as a member of the site type. 3706 owntype = (sym.owner.kind == TYP && 3707 sym.name != names._this && sym.name != names._super) 3708 ? types.memberType(site, sym) 3709 : sym.type; 3710 3711 // If the variable is a constant, record constant value in 3712 // computed type. 3713 if (v.getConstValue() != null && isStaticReference(tree)) 3714 owntype = owntype.constType(v.getConstValue()); 3715 3716 if (resultInfo.pkind == KindSelector.VAL) { 3717 owntype = capture(owntype); // capture "names as expressions" 3718 } 3719 break; 3720 case MTH: { 3721 owntype = checkMethod(site, sym, 3722 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3723 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3724 resultInfo.pt.getTypeArguments()); 3725 break; 3726 } 3727 case PCK: case ERR: 3728 owntype = sym.type; 3729 break; 3730 default: 3731 throw new AssertionError("unexpected kind: " + sym.kind + 3732 " in tree " + tree); 3733 } 3734 3735 // Emit a `deprecation' warning if symbol is deprecated. 3736 // (for constructors (but not for constructor references), the error 3737 // was given when the constructor was resolved) 3738 3739 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3740 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3741 chk.checkSunAPI(tree.pos(), sym); 3742 chk.checkProfile(tree.pos(), sym); 3743 } 3744 3745 // If symbol is a variable, check that its type and 3746 // kind are compatible with the prototype and protokind. 3747 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3748 } 3749 3750 /** Check that variable is initialized and evaluate the variable's 3751 * initializer, if not yet done. Also check that variable is not 3752 * referenced before it is defined. 3753 * @param tree The tree making up the variable reference. 3754 * @param env The current environment. 3755 * @param v The variable's symbol. 3756 */ 3757 private void checkInit(JCTree tree, 3758 Env<AttrContext> env, 3759 VarSymbol v, 3760 boolean onlyWarning) { 3761 // A forward reference is diagnosed if the declaration position 3762 // of the variable is greater than the current tree position 3763 // and the tree and variable definition occur in the same class 3764 // definition. Note that writes don't count as references. 3765 // This check applies only to class and instance 3766 // variables. Local variables follow different scope rules, 3767 // and are subject to definite assignment checking. 3768 Env<AttrContext> initEnv = enclosingInitEnv(env); 3769 if (initEnv != null && 3770 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3771 v.owner.kind == TYP && 3772 v.owner == env.info.scope.owner.enclClass() && 3773 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3774 (!env.tree.hasTag(ASSIGN) || 3775 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3776 String suffix = (initEnv.info.enclVar == v) ? 3777 "self.ref" : "forward.ref"; 3778 if (!onlyWarning || isStaticEnumField(v)) { 3779 log.error(tree.pos(), "illegal." + suffix); 3780 } else if (useBeforeDeclarationWarning) { 3781 log.warning(tree.pos(), suffix, v); 3782 } 3783 } 3784 3785 v.getConstValue(); // ensure initializer is evaluated 3786 3787 checkEnumInitializer(tree, env, v); 3788 } 3789 3790 /** 3791 * Returns the enclosing init environment associated with this env (if any). An init env 3792 * can be either a field declaration env or a static/instance initializer env. 3793 */ 3794 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3795 while (true) { 3796 switch (env.tree.getTag()) { 3797 case VARDEF: 3798 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3799 if (vdecl.sym.owner.kind == TYP) { 3800 //field 3801 return env; 3802 } 3803 break; 3804 case BLOCK: 3805 if (env.next.tree.hasTag(CLASSDEF)) { 3806 //instance/static initializer 3807 return env; 3808 } 3809 break; 3810 case METHODDEF: 3811 case CLASSDEF: 3812 case TOPLEVEL: 3813 return null; 3814 } 3815 Assert.checkNonNull(env.next); 3816 env = env.next; 3817 } 3818 } 3819 3820 /** 3821 * Check for illegal references to static members of enum. In 3822 * an enum type, constructors and initializers may not 3823 * reference its static members unless they are constant. 3824 * 3825 * @param tree The tree making up the variable reference. 3826 * @param env The current environment. 3827 * @param v The variable's symbol. 3828 * @jls section 8.9 Enums 3829 */ 3830 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3831 // JLS: 3832 // 3833 // "It is a compile-time error to reference a static field 3834 // of an enum type that is not a compile-time constant 3835 // (15.28) from constructors, instance initializer blocks, 3836 // or instance variable initializer expressions of that 3837 // type. It is a compile-time error for the constructors, 3838 // instance initializer blocks, or instance variable 3839 // initializer expressions of an enum constant e to refer 3840 // to itself or to an enum constant of the same type that 3841 // is declared to the right of e." 3842 if (isStaticEnumField(v)) { 3843 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3844 3845 if (enclClass == null || enclClass.owner == null) 3846 return; 3847 3848 // See if the enclosing class is the enum (or a 3849 // subclass thereof) declaring v. If not, this 3850 // reference is OK. 3851 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3852 return; 3853 3854 // If the reference isn't from an initializer, then 3855 // the reference is OK. 3856 if (!Resolve.isInitializer(env)) 3857 return; 3858 3859 log.error(tree.pos(), "illegal.enum.static.ref"); 3860 } 3861 } 3862 3863 /** Is the given symbol a static, non-constant field of an Enum? 3864 * Note: enum literals should not be regarded as such 3865 */ 3866 private boolean isStaticEnumField(VarSymbol v) { 3867 return Flags.isEnum(v.owner) && 3868 Flags.isStatic(v) && 3869 !Flags.isConstant(v) && 3870 v.name != names._class; 3871 } 3872 3873 Warner noteWarner = new Warner(); 3874 3875 /** 3876 * Check that method arguments conform to its instantiation. 3877 **/ 3878 public Type checkMethod(Type site, 3879 final Symbol sym, 3880 ResultInfo resultInfo, 3881 Env<AttrContext> env, 3882 final List<JCExpression> argtrees, 3883 List<Type> argtypes, 3884 List<Type> typeargtypes) { 3885 // Test (5): if symbol is an instance method of a raw type, issue 3886 // an unchecked warning if its argument types change under erasure. 3887 if ((sym.flags() & STATIC) == 0 && 3888 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3889 Type s = types.asOuterSuper(site, sym.owner); 3890 if (s != null && s.isRaw() && 3891 !types.isSameTypes(sym.type.getParameterTypes(), 3892 sym.erasure(types).getParameterTypes())) { 3893 chk.warnUnchecked(env.tree.pos(), 3894 "unchecked.call.mbr.of.raw.type", 3895 sym, s); 3896 } 3897 } 3898 3899 if (env.info.defaultSuperCallSite != null) { 3900 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3901 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3902 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3903 List<MethodSymbol> icand_sup = 3904 types.interfaceCandidates(sup, (MethodSymbol)sym); 3905 if (icand_sup.nonEmpty() && 3906 icand_sup.head != sym && 3907 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3908 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3909 diags.fragment("overridden.default", sym, sup)); 3910 break; 3911 } 3912 } 3913 env.info.defaultSuperCallSite = null; 3914 } 3915 3916 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3917 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3918 if (app.meth.hasTag(SELECT) && 3919 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3920 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3921 } 3922 } 3923 3924 // Compute the identifier's instantiated type. 3925 // For methods, we need to compute the instance type by 3926 // Resolve.instantiate from the symbol's type as well as 3927 // any type arguments and value arguments. 3928 noteWarner.clear(); 3929 try { 3930 Type owntype = rs.checkMethod( 3931 env, 3932 site, 3933 sym, 3934 resultInfo, 3935 argtypes, 3936 typeargtypes, 3937 noteWarner); 3938 3939 DeferredAttr.DeferredTypeMap checkDeferredMap = 3940 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3941 3942 argtypes = argtypes.map(checkDeferredMap); 3943 3944 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3945 chk.warnUnchecked(env.tree.pos(), 3946 "unchecked.meth.invocation.applied", 3947 kindName(sym), 3948 sym.name, 3949 rs.methodArguments(sym.type.getParameterTypes()), 3950 rs.methodArguments(argtypes.map(checkDeferredMap)), 3951 kindName(sym.location()), 3952 sym.location()); 3953 owntype = new MethodType(owntype.getParameterTypes(), 3954 types.erasure(owntype.getReturnType()), 3955 types.erasure(owntype.getThrownTypes()), 3956 syms.methodClass); 3957 } 3958 3959 PolyKind pkind = (sym.type.hasTag(FORALL) && 3960 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 3961 PolyKind.POLY : PolyKind.STANDALONE; 3962 TreeInfo.setPolyKind(env.tree, pkind); 3963 3964 return (resultInfo.pt == Infer.anyPoly) ? 3965 owntype : 3966 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 3967 resultInfo.checkContext.inferenceContext()); 3968 } catch (Infer.InferenceException ex) { 3969 //invalid target type - propagate exception outwards or report error 3970 //depending on the current check context 3971 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 3972 return types.createErrorType(site); 3973 } catch (Resolve.InapplicableMethodException ex) { 3974 final JCDiagnostic diag = ex.getDiagnostic(); 3975 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 3976 @Override 3977 protected Pair<Symbol, JCDiagnostic> errCandidate() { 3978 return new Pair<>(sym, diag); 3979 } 3980 }; 3981 List<Type> argtypes2 = argtypes.map( 3982 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3983 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 3984 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 3985 log.report(errDiag); 3986 return types.createErrorType(site); 3987 } 3988 } 3989 3990 public void visitLiteral(JCLiteral tree) { 3991 result = check(tree, litType(tree.typetag).constType(tree.value), 3992 KindSelector.VAL, resultInfo); 3993 } 3994 //where 3995 /** Return the type of a literal with given type tag. 3996 */ 3997 Type litType(TypeTag tag) { 3998 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 3999 } 4000 4001 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4002 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4003 } 4004 4005 public void visitTypeArray(JCArrayTypeTree tree) { 4006 Type etype = attribType(tree.elemtype, env); 4007 Type type = new ArrayType(etype, syms.arrayClass); 4008 result = check(tree, type, KindSelector.TYP, resultInfo); 4009 } 4010 4011 /** Visitor method for parameterized types. 4012 * Bound checking is left until later, since types are attributed 4013 * before supertype structure is completely known 4014 */ 4015 public void visitTypeApply(JCTypeApply tree) { 4016 Type owntype = types.createErrorType(tree.type); 4017 4018 // Attribute functor part of application and make sure it's a class. 4019 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4020 4021 // Attribute type parameters 4022 List<Type> actuals = attribTypes(tree.arguments, env); 4023 4024 if (clazztype.hasTag(CLASS)) { 4025 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4026 if (actuals.isEmpty()) //diamond 4027 actuals = formals; 4028 4029 if (actuals.length() == formals.length()) { 4030 List<Type> a = actuals; 4031 List<Type> f = formals; 4032 while (a.nonEmpty()) { 4033 a.head = a.head.withTypeVar(f.head); 4034 a = a.tail; 4035 f = f.tail; 4036 } 4037 // Compute the proper generic outer 4038 Type clazzOuter = clazztype.getEnclosingType(); 4039 if (clazzOuter.hasTag(CLASS)) { 4040 Type site; 4041 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4042 if (clazz.hasTag(IDENT)) { 4043 site = env.enclClass.sym.type; 4044 } else if (clazz.hasTag(SELECT)) { 4045 site = ((JCFieldAccess) clazz).selected.type; 4046 } else throw new AssertionError(""+tree); 4047 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4048 if (site.hasTag(CLASS)) 4049 site = types.asOuterSuper(site, clazzOuter.tsym); 4050 if (site == null) 4051 site = types.erasure(clazzOuter); 4052 clazzOuter = site; 4053 } 4054 } 4055 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4056 clazztype.getMetadata()); 4057 } else { 4058 if (formals.length() != 0) { 4059 log.error(tree.pos(), "wrong.number.type.args", 4060 Integer.toString(formals.length())); 4061 } else { 4062 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4063 } 4064 owntype = types.createErrorType(tree.type); 4065 } 4066 } 4067 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4068 } 4069 4070 public void visitTypeUnion(JCTypeUnion tree) { 4071 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4072 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4073 for (JCExpression typeTree : tree.alternatives) { 4074 Type ctype = attribType(typeTree, env); 4075 ctype = chk.checkType(typeTree.pos(), 4076 chk.checkClassType(typeTree.pos(), ctype), 4077 syms.throwableType); 4078 if (!ctype.isErroneous()) { 4079 //check that alternatives of a union type are pairwise 4080 //unrelated w.r.t. subtyping 4081 if (chk.intersects(ctype, multicatchTypes.toList())) { 4082 for (Type t : multicatchTypes) { 4083 boolean sub = types.isSubtype(ctype, t); 4084 boolean sup = types.isSubtype(t, ctype); 4085 if (sub || sup) { 4086 //assume 'a' <: 'b' 4087 Type a = sub ? ctype : t; 4088 Type b = sub ? t : ctype; 4089 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4090 } 4091 } 4092 } 4093 multicatchTypes.append(ctype); 4094 if (all_multicatchTypes != null) 4095 all_multicatchTypes.append(ctype); 4096 } else { 4097 if (all_multicatchTypes == null) { 4098 all_multicatchTypes = new ListBuffer<>(); 4099 all_multicatchTypes.appendList(multicatchTypes); 4100 } 4101 all_multicatchTypes.append(ctype); 4102 } 4103 } 4104 Type t = check(tree, types.lub(multicatchTypes.toList()), 4105 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4106 if (t.hasTag(CLASS)) { 4107 List<Type> alternatives = 4108 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4109 t = new UnionClassType((ClassType) t, alternatives); 4110 } 4111 tree.type = result = t; 4112 } 4113 4114 public void visitTypeIntersection(JCTypeIntersection tree) { 4115 attribTypes(tree.bounds, env); 4116 tree.type = result = checkIntersection(tree, tree.bounds); 4117 } 4118 4119 public void visitTypeParameter(JCTypeParameter tree) { 4120 TypeVar typeVar = (TypeVar) tree.type; 4121 4122 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4123 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4124 } 4125 4126 if (!typeVar.bound.isErroneous()) { 4127 //fixup type-parameter bound computed in 'attribTypeVariables' 4128 typeVar.bound = checkIntersection(tree, tree.bounds); 4129 } 4130 } 4131 4132 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4133 Set<Type> boundSet = new HashSet<>(); 4134 if (bounds.nonEmpty()) { 4135 // accept class or interface or typevar as first bound. 4136 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4137 boundSet.add(types.erasure(bounds.head.type)); 4138 if (bounds.head.type.isErroneous()) { 4139 return bounds.head.type; 4140 } 4141 else if (bounds.head.type.hasTag(TYPEVAR)) { 4142 // if first bound was a typevar, do not accept further bounds. 4143 if (bounds.tail.nonEmpty()) { 4144 log.error(bounds.tail.head.pos(), 4145 "type.var.may.not.be.followed.by.other.bounds"); 4146 return bounds.head.type; 4147 } 4148 } else { 4149 // if first bound was a class or interface, accept only interfaces 4150 // as further bounds. 4151 for (JCExpression bound : bounds.tail) { 4152 bound.type = checkBase(bound.type, bound, env, false, true, false); 4153 if (bound.type.isErroneous()) { 4154 bounds = List.of(bound); 4155 } 4156 else if (bound.type.hasTag(CLASS)) { 4157 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4158 } 4159 } 4160 } 4161 } 4162 4163 if (bounds.length() == 0) { 4164 return syms.objectType; 4165 } else if (bounds.length() == 1) { 4166 return bounds.head.type; 4167 } else { 4168 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4169 // ... the variable's bound is a class type flagged COMPOUND 4170 // (see comment for TypeVar.bound). 4171 // In this case, generate a class tree that represents the 4172 // bound class, ... 4173 JCExpression extending; 4174 List<JCExpression> implementing; 4175 if (!bounds.head.type.isInterface()) { 4176 extending = bounds.head; 4177 implementing = bounds.tail; 4178 } else { 4179 extending = null; 4180 implementing = bounds; 4181 } 4182 JCClassDecl cd = make.at(tree).ClassDef( 4183 make.Modifiers(PUBLIC | ABSTRACT), 4184 names.empty, List.<JCTypeParameter>nil(), 4185 extending, implementing, List.<JCTree>nil()); 4186 4187 ClassSymbol c = (ClassSymbol)owntype.tsym; 4188 Assert.check((c.flags() & COMPOUND) != 0); 4189 cd.sym = c; 4190 c.sourcefile = env.toplevel.sourcefile; 4191 4192 // ... and attribute the bound class 4193 c.flags_field |= UNATTRIBUTED; 4194 Env<AttrContext> cenv = enter.classEnv(cd, env); 4195 typeEnvs.put(c, cenv); 4196 attribClass(c); 4197 return owntype; 4198 } 4199 } 4200 4201 public void visitWildcard(JCWildcard tree) { 4202 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4203 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4204 ? syms.objectType 4205 : attribType(tree.inner, env); 4206 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4207 tree.kind.kind, 4208 syms.boundClass), 4209 KindSelector.TYP, resultInfo); 4210 } 4211 4212 public void visitAnnotation(JCAnnotation tree) { 4213 Assert.error("should be handled in annotate"); 4214 } 4215 4216 public void visitAnnotatedType(JCAnnotatedType tree) { 4217 attribAnnotationTypes(tree.annotations, env); 4218 Type underlyingType = attribType(tree.underlyingType, env); 4219 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4220 4221 if (!env.info.isNewClass) 4222 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4223 result = tree.type = annotatedType; 4224 } 4225 4226 public void visitErroneous(JCErroneous tree) { 4227 if (tree.errs != null) 4228 for (JCTree err : tree.errs) 4229 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4230 result = tree.type = syms.errType; 4231 } 4232 4233 /** Default visitor method for all other trees. 4234 */ 4235 public void visitTree(JCTree tree) { 4236 throw new AssertionError(); 4237 } 4238 4239 /** 4240 * Attribute an env for either a top level tree or class declaration. 4241 */ 4242 public void attrib(Env<AttrContext> env) { 4243 if (env.tree.hasTag(TOPLEVEL)) 4244 attribTopLevel(env); 4245 else 4246 attribClass(env.tree.pos(), env.enclClass.sym); 4247 } 4248 4249 /** 4250 * Attribute a top level tree. These trees are encountered when the 4251 * package declaration has annotations. 4252 */ 4253 public void attribTopLevel(Env<AttrContext> env) { 4254 JCCompilationUnit toplevel = env.toplevel; 4255 try { 4256 annotate.flush(); 4257 } catch (CompletionFailure ex) { 4258 chk.completionError(toplevel.pos(), ex); 4259 } 4260 } 4261 4262 /** Main method: attribute class definition associated with given class symbol. 4263 * reporting completion failures at the given position. 4264 * @param pos The source position at which completion errors are to be 4265 * reported. 4266 * @param c The class symbol whose definition will be attributed. 4267 */ 4268 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4269 try { 4270 annotate.flush(); 4271 attribClass(c); 4272 } catch (CompletionFailure ex) { 4273 chk.completionError(pos, ex); 4274 } 4275 } 4276 4277 /** Attribute class definition associated with given class symbol. 4278 * @param c The class symbol whose definition will be attributed. 4279 */ 4280 void attribClass(ClassSymbol c) throws CompletionFailure { 4281 if (c.type.hasTag(ERROR)) return; 4282 4283 // Check for cycles in the inheritance graph, which can arise from 4284 // ill-formed class files. 4285 chk.checkNonCyclic(null, c.type); 4286 4287 Type st = types.supertype(c.type); 4288 if ((c.flags_field & Flags.COMPOUND) == 0) { 4289 // First, attribute superclass. 4290 if (st.hasTag(CLASS)) 4291 attribClass((ClassSymbol)st.tsym); 4292 4293 // Next attribute owner, if it is a class. 4294 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4295 attribClass((ClassSymbol)c.owner); 4296 } 4297 4298 // The previous operations might have attributed the current class 4299 // if there was a cycle. So we test first whether the class is still 4300 // UNATTRIBUTED. 4301 if ((c.flags_field & UNATTRIBUTED) != 0) { 4302 c.flags_field &= ~UNATTRIBUTED; 4303 4304 // Get environment current at the point of class definition. 4305 Env<AttrContext> env = typeEnvs.get(c); 4306 4307 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4308 // because the annotations were not available at the time the env was created. Therefore, 4309 // we look up the environment chain for the first enclosing environment for which the 4310 // lint value is set. Typically, this is the parent env, but might be further if there 4311 // are any envs created as a result of TypeParameter nodes. 4312 Env<AttrContext> lintEnv = env; 4313 while (lintEnv.info.lint == null) 4314 lintEnv = lintEnv.next; 4315 4316 // Having found the enclosing lint value, we can initialize the lint value for this class 4317 env.info.lint = lintEnv.info.lint.augment(c); 4318 4319 Lint prevLint = chk.setLint(env.info.lint); 4320 JavaFileObject prev = log.useSource(c.sourcefile); 4321 ResultInfo prevReturnRes = env.info.returnResult; 4322 4323 try { 4324 deferredLintHandler.flush(env.tree); 4325 env.info.returnResult = null; 4326 // java.lang.Enum may not be subclassed by a non-enum 4327 if (st.tsym == syms.enumSym && 4328 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4329 log.error(env.tree.pos(), "enum.no.subclassing"); 4330 4331 // Enums may not be extended by source-level classes 4332 if (st.tsym != null && 4333 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4334 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4335 log.error(env.tree.pos(), "enum.types.not.extensible"); 4336 } 4337 4338 if (isSerializable(c.type)) { 4339 env.info.isSerializable = true; 4340 } 4341 4342 attribClassBody(env, c); 4343 4344 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4345 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4346 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4347 } finally { 4348 env.info.returnResult = prevReturnRes; 4349 log.useSource(prev); 4350 chk.setLint(prevLint); 4351 } 4352 4353 } 4354 } 4355 4356 public void visitImport(JCImport tree) { 4357 // nothing to do 4358 } 4359 4360 /** Finish the attribution of a class. */ 4361 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4362 JCClassDecl tree = (JCClassDecl)env.tree; 4363 Assert.check(c == tree.sym); 4364 4365 // Validate type parameters, supertype and interfaces. 4366 attribStats(tree.typarams, env); 4367 if (!c.isAnonymous()) { 4368 //already checked if anonymous 4369 chk.validate(tree.typarams, env); 4370 chk.validate(tree.extending, env); 4371 chk.validate(tree.implementing, env); 4372 } 4373 4374 c.markAbstractIfNeeded(types); 4375 4376 // If this is a non-abstract class, check that it has no abstract 4377 // methods or unimplemented methods of an implemented interface. 4378 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4379 if (!relax) 4380 chk.checkAllDefined(tree.pos(), c); 4381 } 4382 4383 if ((c.flags() & ANNOTATION) != 0) { 4384 if (tree.implementing.nonEmpty()) 4385 log.error(tree.implementing.head.pos(), 4386 "cant.extend.intf.annotation"); 4387 if (tree.typarams.nonEmpty()) 4388 log.error(tree.typarams.head.pos(), 4389 "intf.annotation.cant.have.type.params"); 4390 4391 // If this annotation type has a @Repeatable, validate 4392 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4393 // If this annotation type has a @Repeatable, validate 4394 if (repeatable != null) { 4395 // get diagnostic position for error reporting 4396 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4397 Assert.checkNonNull(cbPos); 4398 4399 chk.validateRepeatable(c, repeatable, cbPos); 4400 } 4401 } else { 4402 // Check that all extended classes and interfaces 4403 // are compatible (i.e. no two define methods with same arguments 4404 // yet different return types). (JLS 8.4.6.3) 4405 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4406 if (allowDefaultMethods) { 4407 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4408 } 4409 } 4410 4411 // Check that class does not import the same parameterized interface 4412 // with two different argument lists. 4413 chk.checkClassBounds(tree.pos(), c.type); 4414 4415 tree.type = c.type; 4416 4417 for (List<JCTypeParameter> l = tree.typarams; 4418 l.nonEmpty(); l = l.tail) { 4419 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4420 } 4421 4422 // Check that a generic class doesn't extend Throwable 4423 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4424 log.error(tree.extending.pos(), "generic.throwable"); 4425 4426 // Check that all methods which implement some 4427 // method conform to the method they implement. 4428 chk.checkImplementations(tree); 4429 4430 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4431 checkAutoCloseable(tree.pos(), env, c.type); 4432 4433 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4434 // Attribute declaration 4435 attribStat(l.head, env); 4436 // Check that declarations in inner classes are not static (JLS 8.1.2) 4437 // Make an exception for static constants. 4438 if (c.owner.kind != PCK && 4439 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4440 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4441 Symbol sym = null; 4442 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4443 if (sym == null || 4444 sym.kind != VAR || 4445 ((VarSymbol) sym).getConstValue() == null) 4446 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4447 } 4448 } 4449 4450 // Check for cycles among non-initial constructors. 4451 chk.checkCyclicConstructors(tree); 4452 4453 // Check for cycles among annotation elements. 4454 chk.checkNonCyclicElements(tree); 4455 4456 // Check for proper use of serialVersionUID 4457 if (env.info.lint.isEnabled(LintCategory.SERIAL) && 4458 isSerializable(c.type) && 4459 (c.flags() & Flags.ENUM) == 0 && 4460 checkForSerial(c)) { 4461 checkSerialVersionUID(tree, c); 4462 } 4463 if (allowTypeAnnos) { 4464 // Correctly organize the postions of the type annotations 4465 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4466 4467 // Check type annotations applicability rules 4468 validateTypeAnnotations(tree, false); 4469 } 4470 } 4471 // where 4472 boolean checkForSerial(ClassSymbol c) { 4473 if ((c.flags() & ABSTRACT) == 0) { 4474 return true; 4475 } else { 4476 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4477 } 4478 } 4479 4480 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() { 4481 @Override 4482 public boolean accepts(Symbol s) { 4483 return s.kind == MTH && 4484 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4485 } 4486 }; 4487 4488 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4489 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4490 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4491 if (types.isSameType(al.head.annotationType.type, t)) 4492 return al.head.pos(); 4493 } 4494 4495 return null; 4496 } 4497 4498 /** check if a type is a subtype of Serializable, if that is available. */ 4499 boolean isSerializable(Type t) { 4500 try { 4501 syms.serializableType.complete(); 4502 } 4503 catch (CompletionFailure e) { 4504 return false; 4505 } 4506 return types.isSubtype(t, syms.serializableType); 4507 } 4508 4509 /** Check that an appropriate serialVersionUID member is defined. */ 4510 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4511 4512 // check for presence of serialVersionUID 4513 VarSymbol svuid = null; 4514 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4515 if (sym.kind == VAR) { 4516 svuid = (VarSymbol)sym; 4517 break; 4518 } 4519 } 4520 4521 if (svuid == null) { 4522 log.warning(LintCategory.SERIAL, 4523 tree.pos(), "missing.SVUID", c); 4524 return; 4525 } 4526 4527 // check that it is static final 4528 if ((svuid.flags() & (STATIC | FINAL)) != 4529 (STATIC | FINAL)) 4530 log.warning(LintCategory.SERIAL, 4531 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4532 4533 // check that it is long 4534 else if (!svuid.type.hasTag(LONG)) 4535 log.warning(LintCategory.SERIAL, 4536 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4537 4538 // check constant 4539 else if (svuid.getConstValue() == null) 4540 log.warning(LintCategory.SERIAL, 4541 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4542 } 4543 4544 private Type capture(Type type) { 4545 return types.capture(type); 4546 } 4547 4548 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4549 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4550 } 4551 //where 4552 private final class TypeAnnotationsValidator extends TreeScanner { 4553 4554 private final boolean sigOnly; 4555 public TypeAnnotationsValidator(boolean sigOnly) { 4556 this.sigOnly = sigOnly; 4557 } 4558 4559 public void visitAnnotation(JCAnnotation tree) { 4560 chk.validateTypeAnnotation(tree, false); 4561 super.visitAnnotation(tree); 4562 } 4563 public void visitAnnotatedType(JCAnnotatedType tree) { 4564 if (!tree.underlyingType.type.isErroneous()) { 4565 super.visitAnnotatedType(tree); 4566 } 4567 } 4568 public void visitTypeParameter(JCTypeParameter tree) { 4569 chk.validateTypeAnnotations(tree.annotations, true); 4570 scan(tree.bounds); 4571 // Don't call super. 4572 // This is needed because above we call validateTypeAnnotation with 4573 // false, which would forbid annotations on type parameters. 4574 // super.visitTypeParameter(tree); 4575 } 4576 public void visitMethodDef(JCMethodDecl tree) { 4577 if (tree.recvparam != null && 4578 !tree.recvparam.vartype.type.isErroneous()) { 4579 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4580 tree.recvparam.vartype.type.tsym); 4581 } 4582 if (tree.restype != null && tree.restype.type != null) { 4583 validateAnnotatedType(tree.restype, tree.restype.type); 4584 } 4585 if (sigOnly) { 4586 scan(tree.mods); 4587 scan(tree.restype); 4588 scan(tree.typarams); 4589 scan(tree.recvparam); 4590 scan(tree.params); 4591 scan(tree.thrown); 4592 } else { 4593 scan(tree.defaultValue); 4594 scan(tree.body); 4595 } 4596 } 4597 public void visitVarDef(final JCVariableDecl tree) { 4598 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4599 if (tree.sym != null && tree.sym.type != null) 4600 validateAnnotatedType(tree.vartype, tree.sym.type); 4601 scan(tree.mods); 4602 scan(tree.vartype); 4603 if (!sigOnly) { 4604 scan(tree.init); 4605 } 4606 } 4607 public void visitTypeCast(JCTypeCast tree) { 4608 if (tree.clazz != null && tree.clazz.type != null) 4609 validateAnnotatedType(tree.clazz, tree.clazz.type); 4610 super.visitTypeCast(tree); 4611 } 4612 public void visitTypeTest(JCInstanceOf tree) { 4613 if (tree.clazz != null && tree.clazz.type != null) 4614 validateAnnotatedType(tree.clazz, tree.clazz.type); 4615 super.visitTypeTest(tree); 4616 } 4617 public void visitNewClass(JCNewClass tree) { 4618 if (tree.clazz != null && tree.clazz.type != null) { 4619 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4620 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4621 tree.clazz.type.tsym); 4622 } 4623 if (tree.def != null) { 4624 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4625 } 4626 4627 validateAnnotatedType(tree.clazz, tree.clazz.type); 4628 } 4629 super.visitNewClass(tree); 4630 } 4631 public void visitNewArray(JCNewArray tree) { 4632 if (tree.elemtype != null && tree.elemtype.type != null) { 4633 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4634 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4635 tree.elemtype.type.tsym); 4636 } 4637 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4638 } 4639 super.visitNewArray(tree); 4640 } 4641 public void visitClassDef(JCClassDecl tree) { 4642 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4643 if (sigOnly) { 4644 scan(tree.mods); 4645 scan(tree.typarams); 4646 scan(tree.extending); 4647 scan(tree.implementing); 4648 } 4649 for (JCTree member : tree.defs) { 4650 if (member.hasTag(Tag.CLASSDEF)) { 4651 continue; 4652 } 4653 scan(member); 4654 } 4655 } 4656 public void visitBlock(JCBlock tree) { 4657 if (!sigOnly) { 4658 scan(tree.stats); 4659 } 4660 } 4661 4662 /* I would want to model this after 4663 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4664 * and override visitSelect and visitTypeApply. 4665 * However, we only set the annotated type in the top-level type 4666 * of the symbol. 4667 * Therefore, we need to override each individual location where a type 4668 * can occur. 4669 */ 4670 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4671 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4672 4673 if (type.isPrimitiveOrVoid()) { 4674 return; 4675 } 4676 4677 JCTree enclTr = errtree; 4678 Type enclTy = type; 4679 4680 boolean repeat = true; 4681 while (repeat) { 4682 if (enclTr.hasTag(TYPEAPPLY)) { 4683 List<Type> tyargs = enclTy.getTypeArguments(); 4684 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4685 if (trargs.length() > 0) { 4686 // Nothing to do for diamonds 4687 if (tyargs.length() == trargs.length()) { 4688 for (int i = 0; i < tyargs.length(); ++i) { 4689 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4690 } 4691 } 4692 // If the lengths don't match, it's either a diamond 4693 // or some nested type that redundantly provides 4694 // type arguments in the tree. 4695 } 4696 4697 // Look at the clazz part of a generic type 4698 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4699 } 4700 4701 if (enclTr.hasTag(SELECT)) { 4702 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4703 if (enclTy != null && 4704 !enclTy.hasTag(NONE)) { 4705 enclTy = enclTy.getEnclosingType(); 4706 } 4707 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4708 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4709 if (enclTy == null || enclTy.hasTag(NONE)) { 4710 if (at.getAnnotations().size() == 1) { 4711 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4712 } else { 4713 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4714 for (JCAnnotation an : at.getAnnotations()) { 4715 comps.add(an.attribute); 4716 } 4717 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4718 } 4719 repeat = false; 4720 } 4721 enclTr = at.underlyingType; 4722 // enclTy doesn't need to be changed 4723 } else if (enclTr.hasTag(IDENT)) { 4724 repeat = false; 4725 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4726 JCWildcard wc = (JCWildcard) enclTr; 4727 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4728 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4729 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4730 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4731 } else { 4732 // Nothing to do for UNBOUND 4733 } 4734 repeat = false; 4735 } else if (enclTr.hasTag(TYPEARRAY)) { 4736 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4737 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4738 repeat = false; 4739 } else if (enclTr.hasTag(TYPEUNION)) { 4740 JCTypeUnion ut = (JCTypeUnion) enclTr; 4741 for (JCTree t : ut.getTypeAlternatives()) { 4742 validateAnnotatedType(t, t.type); 4743 } 4744 repeat = false; 4745 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4746 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4747 for (JCTree t : it.getBounds()) { 4748 validateAnnotatedType(t, t.type); 4749 } 4750 repeat = false; 4751 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4752 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4753 repeat = false; 4754 } else { 4755 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4756 " within: "+ errtree + " with kind: " + errtree.getKind()); 4757 } 4758 } 4759 } 4760 4761 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4762 Symbol sym) { 4763 // Ensure that no declaration annotations are present. 4764 // Note that a tree type might be an AnnotatedType with 4765 // empty annotations, if only declaration annotations were given. 4766 // This method will raise an error for such a type. 4767 for (JCAnnotation ai : annotations) { 4768 if (!ai.type.isErroneous() && 4769 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4770 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4771 } 4772 } 4773 } 4774 } 4775 4776 // <editor-fold desc="post-attribution visitor"> 4777 4778 /** 4779 * Handle missing types/symbols in an AST. This routine is useful when 4780 * the compiler has encountered some errors (which might have ended up 4781 * terminating attribution abruptly); if the compiler is used in fail-over 4782 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4783 * prevents NPE to be progagated during subsequent compilation steps. 4784 */ 4785 public void postAttr(JCTree tree) { 4786 new PostAttrAnalyzer().scan(tree); 4787 } 4788 4789 class PostAttrAnalyzer extends TreeScanner { 4790 4791 private void initTypeIfNeeded(JCTree that) { 4792 if (that.type == null) { 4793 if (that.hasTag(METHODDEF)) { 4794 that.type = dummyMethodType((JCMethodDecl)that); 4795 } else { 4796 that.type = syms.unknownType; 4797 } 4798 } 4799 } 4800 4801 /* Construct a dummy method type. If we have a method declaration, 4802 * and the declared return type is void, then use that return type 4803 * instead of UNKNOWN to avoid spurious error messages in lambda 4804 * bodies (see:JDK-8041704). 4805 */ 4806 private Type dummyMethodType(JCMethodDecl md) { 4807 Type restype = syms.unknownType; 4808 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4809 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4810 if (prim.typetag == VOID) 4811 restype = syms.voidType; 4812 } 4813 return new MethodType(List.<Type>nil(), restype, 4814 List.<Type>nil(), syms.methodClass); 4815 } 4816 private Type dummyMethodType() { 4817 return dummyMethodType(null); 4818 } 4819 4820 @Override 4821 public void scan(JCTree tree) { 4822 if (tree == null) return; 4823 if (tree instanceof JCExpression) { 4824 initTypeIfNeeded(tree); 4825 } 4826 super.scan(tree); 4827 } 4828 4829 @Override 4830 public void visitIdent(JCIdent that) { 4831 if (that.sym == null) { 4832 that.sym = syms.unknownSymbol; 4833 } 4834 } 4835 4836 @Override 4837 public void visitSelect(JCFieldAccess that) { 4838 if (that.sym == null) { 4839 that.sym = syms.unknownSymbol; 4840 } 4841 super.visitSelect(that); 4842 } 4843 4844 @Override 4845 public void visitClassDef(JCClassDecl that) { 4846 initTypeIfNeeded(that); 4847 if (that.sym == null) { 4848 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4849 } 4850 super.visitClassDef(that); 4851 } 4852 4853 @Override 4854 public void visitMethodDef(JCMethodDecl that) { 4855 initTypeIfNeeded(that); 4856 if (that.sym == null) { 4857 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4858 } 4859 super.visitMethodDef(that); 4860 } 4861 4862 @Override 4863 public void visitVarDef(JCVariableDecl that) { 4864 initTypeIfNeeded(that); 4865 if (that.sym == null) { 4866 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4867 that.sym.adr = 0; 4868 } 4869 super.visitVarDef(that); 4870 } 4871 4872 @Override 4873 public void visitNewClass(JCNewClass that) { 4874 if (that.constructor == null) { 4875 that.constructor = new MethodSymbol(0, names.init, 4876 dummyMethodType(), syms.noSymbol); 4877 } 4878 if (that.constructorType == null) { 4879 that.constructorType = syms.unknownType; 4880 } 4881 super.visitNewClass(that); 4882 } 4883 4884 @Override 4885 public void visitAssignop(JCAssignOp that) { 4886 if (that.operator == null) { 4887 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4888 -1, syms.noSymbol); 4889 } 4890 super.visitAssignop(that); 4891 } 4892 4893 @Override 4894 public void visitBinary(JCBinary that) { 4895 if (that.operator == null) { 4896 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4897 -1, syms.noSymbol); 4898 } 4899 super.visitBinary(that); 4900 } 4901 4902 @Override 4903 public void visitUnary(JCUnary that) { 4904 if (that.operator == null) { 4905 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4906 -1, syms.noSymbol); 4907 } 4908 super.visitUnary(that); 4909 } 4910 4911 @Override 4912 public void visitLambda(JCLambda that) { 4913 super.visitLambda(that); 4914 if (that.targets == null) { 4915 that.targets = List.nil(); 4916 } 4917 } 4918 4919 @Override 4920 public void visitReference(JCMemberReference that) { 4921 super.visitReference(that); 4922 if (that.sym == null) { 4923 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 4924 syms.noSymbol); 4925 } 4926 if (that.targets == null) { 4927 that.targets = List.nil(); 4928 } 4929 } 4930 } 4931 // </editor-fold> 4932} 4933