Attr.java revision 4102:b873436b362b
1/* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.*; 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.Directive.RequiresFlag; 40import com.sun.tools.javac.code.Lint.LintCategory; 41import com.sun.tools.javac.code.Scope.WriteableScope; 42import com.sun.tools.javac.code.Symbol.*; 43import com.sun.tools.javac.code.Type.*; 44import com.sun.tools.javac.code.TypeMetadata.Annotations; 45import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 46import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext; 47import com.sun.tools.javac.comp.Check.CheckContext; 48import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 49import com.sun.tools.javac.comp.Infer.FreeTypeListener; 50import com.sun.tools.javac.jvm.*; 51import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 52import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 53import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 54import com.sun.tools.javac.resources.CompilerProperties.Errors; 55import com.sun.tools.javac.resources.CompilerProperties.Fragments; 56import com.sun.tools.javac.tree.*; 57import com.sun.tools.javac.tree.JCTree.*; 58import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 59import com.sun.tools.javac.util.*; 60import com.sun.tools.javac.util.DefinedBy.Api; 61import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 62import com.sun.tools.javac.util.JCDiagnostic.Fragment; 63import com.sun.tools.javac.util.List; 64 65import static com.sun.tools.javac.code.Flags.*; 66import static com.sun.tools.javac.code.Flags.ANNOTATION; 67import static com.sun.tools.javac.code.Flags.BLOCK; 68import static com.sun.tools.javac.code.Kinds.*; 69import static com.sun.tools.javac.code.Kinds.Kind.*; 70import static com.sun.tools.javac.code.TypeTag.*; 71import static com.sun.tools.javac.code.TypeTag.WILDCARD; 72import static com.sun.tools.javac.tree.JCTree.Tag.*; 73import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 74 75/** This is the main context-dependent analysis phase in GJC. It 76 * encompasses name resolution, type checking and constant folding as 77 * subtasks. Some subtasks involve auxiliary classes. 78 * @see Check 79 * @see Resolve 80 * @see ConstFold 81 * @see Infer 82 * 83 * <p><b>This is NOT part of any supported API. 84 * If you write code that depends on this, you do so at your own risk. 85 * This code and its internal interfaces are subject to change or 86 * deletion without notice.</b> 87 */ 88public class Attr extends JCTree.Visitor { 89 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 90 91 final Names names; 92 final Log log; 93 final Symtab syms; 94 final Resolve rs; 95 final Operators operators; 96 final Infer infer; 97 final Analyzer analyzer; 98 final DeferredAttr deferredAttr; 99 final Check chk; 100 final Flow flow; 101 final MemberEnter memberEnter; 102 final TypeEnter typeEnter; 103 final TreeMaker make; 104 final ConstFold cfolder; 105 final Enter enter; 106 final Target target; 107 final Types types; 108 final JCDiagnostic.Factory diags; 109 final TypeAnnotations typeAnnotations; 110 final DeferredLintHandler deferredLintHandler; 111 final TypeEnvs typeEnvs; 112 final Dependencies dependencies; 113 final Annotate annotate; 114 final ArgumentAttr argumentAttr; 115 116 public static Attr instance(Context context) { 117 Attr instance = context.get(attrKey); 118 if (instance == null) 119 instance = new Attr(context); 120 return instance; 121 } 122 123 protected Attr(Context context) { 124 context.put(attrKey, this); 125 126 names = Names.instance(context); 127 log = Log.instance(context); 128 syms = Symtab.instance(context); 129 rs = Resolve.instance(context); 130 operators = Operators.instance(context); 131 chk = Check.instance(context); 132 flow = Flow.instance(context); 133 memberEnter = MemberEnter.instance(context); 134 typeEnter = TypeEnter.instance(context); 135 make = TreeMaker.instance(context); 136 enter = Enter.instance(context); 137 infer = Infer.instance(context); 138 analyzer = Analyzer.instance(context); 139 deferredAttr = DeferredAttr.instance(context); 140 cfolder = ConstFold.instance(context); 141 target = Target.instance(context); 142 types = Types.instance(context); 143 diags = JCDiagnostic.Factory.instance(context); 144 annotate = Annotate.instance(context); 145 typeAnnotations = TypeAnnotations.instance(context); 146 deferredLintHandler = DeferredLintHandler.instance(context); 147 typeEnvs = TypeEnvs.instance(context); 148 dependencies = Dependencies.instance(context); 149 argumentAttr = ArgumentAttr.instance(context); 150 151 Options options = Options.instance(context); 152 153 Source source = Source.instance(context); 154 allowStringsInSwitch = source.allowStringsInSwitch(); 155 allowPoly = source.allowPoly(); 156 allowTypeAnnos = source.allowTypeAnnotations(); 157 allowLambda = source.allowLambda(); 158 allowDefaultMethods = source.allowDefaultMethods(); 159 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 160 sourceName = source.name; 161 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 162 163 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 164 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 165 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 166 methodAttrInfo = new MethodAttrInfo(); 167 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 168 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 169 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 170 } 171 172 /** Switch: support target-typing inference 173 */ 174 boolean allowPoly; 175 176 /** Switch: support type annotations. 177 */ 178 boolean allowTypeAnnos; 179 180 /** Switch: support lambda expressions ? 181 */ 182 boolean allowLambda; 183 184 /** Switch: support default methods ? 185 */ 186 boolean allowDefaultMethods; 187 188 /** Switch: static interface methods enabled? 189 */ 190 boolean allowStaticInterfaceMethods; 191 192 /** 193 * Switch: warn about use of variable before declaration? 194 * RFE: 6425594 195 */ 196 boolean useBeforeDeclarationWarning; 197 198 /** 199 * Switch: allow strings in switch? 200 */ 201 boolean allowStringsInSwitch; 202 203 /** 204 * Switch: name of source level; used for error reporting. 205 */ 206 String sourceName; 207 208 /** Check kind and type of given tree against protokind and prototype. 209 * If check succeeds, store type in tree and return it. 210 * If check fails, store errType in tree and return it. 211 * No checks are performed if the prototype is a method type. 212 * It is not necessary in this case since we know that kind and type 213 * are correct. 214 * 215 * @param tree The tree whose kind and type is checked 216 * @param found The computed type of the tree 217 * @param ownkind The computed kind of the tree 218 * @param resultInfo The expected result of the tree 219 */ 220 Type check(final JCTree tree, 221 final Type found, 222 final KindSelector ownkind, 223 final ResultInfo resultInfo) { 224 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 225 Type owntype; 226 boolean shouldCheck = !found.hasTag(ERROR) && 227 !resultInfo.pt.hasTag(METHOD) && 228 !resultInfo.pt.hasTag(FORALL); 229 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 230 log.error(tree.pos(), "unexpected.type", 231 resultInfo.pkind.kindNames(), 232 ownkind.kindNames()); 233 owntype = types.createErrorType(found); 234 } else if (allowPoly && inferenceContext.free(found)) { 235 //delay the check if there are inference variables in the found type 236 //this means we are dealing with a partially inferred poly expression 237 owntype = shouldCheck ? resultInfo.pt : found; 238 if (resultInfo.checkMode.installPostInferenceHook()) { 239 inferenceContext.addFreeTypeListener(List.of(found), 240 instantiatedContext -> { 241 ResultInfo pendingResult = 242 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 243 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 244 }); 245 } 246 } else { 247 owntype = shouldCheck ? 248 resultInfo.check(tree, found) : 249 found; 250 } 251 if (resultInfo.checkMode.updateTreeType()) { 252 tree.type = owntype; 253 } 254 return owntype; 255 } 256 257 /** Is given blank final variable assignable, i.e. in a scope where it 258 * may be assigned to even though it is final? 259 * @param v The blank final variable. 260 * @param env The current environment. 261 */ 262 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 263 Symbol owner = env.info.scope.owner; 264 // owner refers to the innermost variable, method or 265 // initializer block declaration at this point. 266 return 267 v.owner == owner 268 || 269 ((owner.name == names.init || // i.e. we are in a constructor 270 owner.kind == VAR || // i.e. we are in a variable initializer 271 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 272 && 273 v.owner == owner.owner 274 && 275 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 276 } 277 278 /** Check that variable can be assigned to. 279 * @param pos The current source code position. 280 * @param v The assigned variable 281 * @param base If the variable is referred to in a Select, the part 282 * to the left of the `.', null otherwise. 283 * @param env The current environment. 284 */ 285 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 286 if (v.name == names._this) { 287 log.error(pos, Errors.CantAssignValToThis); 288 } else if ((v.flags() & FINAL) != 0 && 289 ((v.flags() & HASINIT) != 0 290 || 291 !((base == null || 292 (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 attribIdent(tree, localEnv); 341 } 342 343 /** Attribute a parsed identifier. 344 * @param tree Parsed identifier name 345 * @param env The env to use 346 */ 347 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 348 return tree.accept(identAttributer, env); 349 } 350 // where 351 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 352 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 353 @Override @DefinedBy(Api.COMPILER_TREE) 354 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 355 Symbol site = visit(node.getExpression(), env); 356 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN) 357 return site; 358 Name name = (Name)node.getIdentifier(); 359 if (site.kind == PCK) { 360 env.toplevel.packge = (PackageSymbol)site; 361 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 362 KindSelector.TYP_PCK); 363 } else { 364 env.enclClass.sym = (ClassSymbol)site; 365 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 366 } 367 } 368 369 @Override @DefinedBy(Api.COMPILER_TREE) 370 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 371 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 372 } 373 } 374 375 public Type coerce(Type etype, Type ttype) { 376 return cfolder.coerce(etype, ttype); 377 } 378 379 public Type attribType(JCTree node, TypeSymbol sym) { 380 Env<AttrContext> env = typeEnvs.get(sym); 381 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 382 return attribTree(node, localEnv, unknownTypeInfo); 383 } 384 385 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 386 // Attribute qualifying package or class. 387 JCFieldAccess s = (JCFieldAccess)tree.qualid; 388 return attribTree(s.selected, env, 389 new ResultInfo(tree.staticImport ? 390 KindSelector.TYP : KindSelector.TYP_PCK, 391 Type.noType)); 392 } 393 394 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 395 breakTree = tree; 396 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 397 try { 398 attribExpr(expr, env); 399 } catch (BreakAttr b) { 400 return b.env; 401 } catch (AssertionError ae) { 402 if (ae.getCause() instanceof BreakAttr) { 403 return ((BreakAttr)(ae.getCause())).env; 404 } else { 405 throw ae; 406 } 407 } finally { 408 breakTree = null; 409 log.useSource(prev); 410 } 411 return env; 412 } 413 414 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 415 breakTree = tree; 416 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 417 try { 418 attribStat(stmt, env); 419 } catch (BreakAttr b) { 420 return b.env; 421 } catch (AssertionError ae) { 422 if (ae.getCause() instanceof BreakAttr) { 423 return ((BreakAttr)(ae.getCause())).env; 424 } else { 425 throw ae; 426 } 427 } finally { 428 breakTree = null; 429 log.useSource(prev); 430 } 431 return env; 432 } 433 434 private JCTree breakTree = null; 435 436 private static class BreakAttr extends RuntimeException { 437 static final long serialVersionUID = -6924771130405446405L; 438 private Env<AttrContext> env; 439 private BreakAttr(Env<AttrContext> env) { 440 this.env = env; 441 } 442 } 443 444 /** 445 * Mode controlling behavior of Attr.Check 446 */ 447 enum CheckMode { 448 449 NORMAL, 450 451 /** 452 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is 453 * that the captured var cache in {@code InferenceContext} will be used in read-only 454 * mode when performing inference checks. 455 */ 456 NO_TREE_UPDATE { 457 @Override 458 public boolean updateTreeType() { 459 return false; 460 } 461 }, 462 /** 463 * Mode signalling that caller will manage free types in tree decorations. 464 */ 465 NO_INFERENCE_HOOK { 466 @Override 467 public boolean installPostInferenceHook() { 468 return false; 469 } 470 }; 471 472 public boolean updateTreeType() { 473 return true; 474 } 475 public boolean installPostInferenceHook() { 476 return true; 477 } 478 } 479 480 481 class ResultInfo { 482 final KindSelector pkind; 483 final Type pt; 484 final CheckContext checkContext; 485 final CheckMode checkMode; 486 487 ResultInfo(KindSelector pkind, Type pt) { 488 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 489 } 490 491 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 492 this(pkind, pt, chk.basicHandler, checkMode); 493 } 494 495 protected ResultInfo(KindSelector pkind, 496 Type pt, CheckContext checkContext) { 497 this(pkind, pt, checkContext, CheckMode.NORMAL); 498 } 499 500 protected ResultInfo(KindSelector pkind, 501 Type pt, CheckContext checkContext, CheckMode checkMode) { 502 this.pkind = pkind; 503 this.pt = pt; 504 this.checkContext = checkContext; 505 this.checkMode = checkMode; 506 } 507 508 /** 509 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one? 510 * @param tree The tree to be type-checked. 511 * @return true if {@ArgumentAttr} should be used. 512 */ 513 protected boolean needsArgumentAttr(JCTree tree) { return false; } 514 515 protected Type check(final DiagnosticPosition pos, final Type found) { 516 return chk.checkType(pos, found, pt, checkContext); 517 } 518 519 protected ResultInfo dup(Type newPt) { 520 return new ResultInfo(pkind, newPt, checkContext, checkMode); 521 } 522 523 protected ResultInfo dup(CheckContext newContext) { 524 return new ResultInfo(pkind, pt, newContext, checkMode); 525 } 526 527 protected ResultInfo dup(Type newPt, CheckContext newContext) { 528 return new ResultInfo(pkind, newPt, newContext, checkMode); 529 } 530 531 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 532 return new ResultInfo(pkind, newPt, newContext, newMode); 533 } 534 535 protected ResultInfo dup(CheckMode newMode) { 536 return new ResultInfo(pkind, pt, checkContext, newMode); 537 } 538 539 @Override 540 public String toString() { 541 if (pt != null) { 542 return pt.toString(); 543 } else { 544 return ""; 545 } 546 } 547 } 548 549 class MethodAttrInfo extends ResultInfo { 550 public MethodAttrInfo() { 551 this(chk.basicHandler); 552 } 553 554 public MethodAttrInfo(CheckContext checkContext) { 555 super(KindSelector.VAL, Infer.anyPoly, checkContext); 556 } 557 558 @Override 559 protected boolean needsArgumentAttr(JCTree tree) { 560 return true; 561 } 562 563 protected ResultInfo dup(Type newPt) { 564 throw new IllegalStateException(); 565 } 566 567 protected ResultInfo dup(CheckContext newContext) { 568 return new MethodAttrInfo(newContext); 569 } 570 571 protected ResultInfo dup(Type newPt, CheckContext newContext) { 572 throw new IllegalStateException(); 573 } 574 575 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 576 throw new IllegalStateException(); 577 } 578 579 protected ResultInfo dup(CheckMode newMode) { 580 throw new IllegalStateException(); 581 } 582 } 583 584 class RecoveryInfo extends ResultInfo { 585 586 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 587 super(KindSelector.VAL, Type.recoveryType, 588 new Check.NestedCheckContext(chk.basicHandler) { 589 @Override 590 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 591 return deferredAttrContext; 592 } 593 @Override 594 public boolean compatible(Type found, Type req, Warner warn) { 595 return true; 596 } 597 @Override 598 public void report(DiagnosticPosition pos, JCDiagnostic details) { 599 chk.basicHandler.report(pos, details); 600 } 601 }); 602 } 603 } 604 605 final ResultInfo statInfo; 606 final ResultInfo varAssignmentInfo; 607 final ResultInfo methodAttrInfo; 608 final ResultInfo unknownExprInfo; 609 final ResultInfo unknownTypeInfo; 610 final ResultInfo unknownTypeExprInfo; 611 final ResultInfo recoveryInfo; 612 613 Type pt() { 614 return resultInfo.pt; 615 } 616 617 KindSelector pkind() { 618 return resultInfo.pkind; 619 } 620 621/* ************************************************************************ 622 * Visitor methods 623 *************************************************************************/ 624 625 /** Visitor argument: the current environment. 626 */ 627 Env<AttrContext> env; 628 629 /** Visitor argument: the currently expected attribution result. 630 */ 631 ResultInfo resultInfo; 632 633 /** Visitor result: the computed type. 634 */ 635 Type result; 636 637 /** Visitor method: attribute a tree, catching any completion failure 638 * exceptions. Return the tree's type. 639 * 640 * @param tree The tree to be visited. 641 * @param env The environment visitor argument. 642 * @param resultInfo The result info visitor argument. 643 */ 644 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 645 Env<AttrContext> prevEnv = this.env; 646 ResultInfo prevResult = this.resultInfo; 647 try { 648 this.env = env; 649 this.resultInfo = resultInfo; 650 if (resultInfo.needsArgumentAttr(tree)) { 651 result = argumentAttr.attribArg(tree, env); 652 } else { 653 tree.accept(this); 654 } 655 if (tree == breakTree && 656 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 657 throw new BreakAttr(copyEnv(env)); 658 } 659 return result; 660 } catch (CompletionFailure ex) { 661 tree.type = syms.errType; 662 return chk.completionError(tree.pos(), ex); 663 } finally { 664 this.env = prevEnv; 665 this.resultInfo = prevResult; 666 } 667 } 668 669 Env<AttrContext> copyEnv(Env<AttrContext> env) { 670 Env<AttrContext> newEnv = 671 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 672 if (newEnv.outer != null) { 673 newEnv.outer = copyEnv(newEnv.outer); 674 } 675 return newEnv; 676 } 677 678 WriteableScope copyScope(WriteableScope sc) { 679 WriteableScope newScope = WriteableScope.create(sc.owner); 680 List<Symbol> elemsList = List.nil(); 681 for (Symbol sym : sc.getSymbols()) { 682 elemsList = elemsList.prepend(sym); 683 } 684 for (Symbol s : elemsList) { 685 newScope.enter(s); 686 } 687 return newScope; 688 } 689 690 /** Derived visitor method: attribute an expression tree. 691 */ 692 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 693 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 694 } 695 696 /** Derived visitor method: attribute an expression tree with 697 * no constraints on the computed type. 698 */ 699 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 700 return attribTree(tree, env, unknownExprInfo); 701 } 702 703 /** Derived visitor method: attribute a type tree. 704 */ 705 public Type attribType(JCTree tree, Env<AttrContext> env) { 706 Type result = attribType(tree, env, Type.noType); 707 return result; 708 } 709 710 /** Derived visitor method: attribute a type tree. 711 */ 712 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 713 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 714 return result; 715 } 716 717 /** Derived visitor method: attribute a statement or definition tree. 718 */ 719 public Type attribStat(JCTree tree, Env<AttrContext> env) { 720 Env<AttrContext> analyzeEnv = 721 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 722 try { 723 return attribTree(tree, env, statInfo); 724 } finally { 725 analyzer.analyzeIfNeeded(tree, analyzeEnv); 726 } 727 } 728 729 /** Attribute a list of expressions, returning a list of types. 730 */ 731 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 732 ListBuffer<Type> ts = new ListBuffer<>(); 733 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 734 ts.append(attribExpr(l.head, env, pt)); 735 return ts.toList(); 736 } 737 738 /** Attribute a list of statements, returning nothing. 739 */ 740 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 741 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 742 attribStat(l.head, env); 743 } 744 745 /** Attribute the arguments in a method call, returning the method kind. 746 */ 747 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 748 KindSelector kind = initialKind; 749 for (JCExpression arg : trees) { 750 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 751 if (argtype.hasTag(DEFERRED)) { 752 kind = KindSelector.of(KindSelector.POLY, kind); 753 } 754 argtypes.append(argtype); 755 } 756 return kind; 757 } 758 759 /** Attribute a type argument list, returning a list of types. 760 * Caller is responsible for calling checkRefTypes. 761 */ 762 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 763 ListBuffer<Type> argtypes = new ListBuffer<>(); 764 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 765 argtypes.append(attribType(l.head, env)); 766 return argtypes.toList(); 767 } 768 769 /** Attribute a type argument list, returning a list of types. 770 * Check that all the types are references. 771 */ 772 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 773 List<Type> types = attribAnyTypes(trees, env); 774 return chk.checkRefTypes(trees, types); 775 } 776 777 /** 778 * Attribute type variables (of generic classes or methods). 779 * Compound types are attributed later in attribBounds. 780 * @param typarams the type variables to enter 781 * @param env the current environment 782 */ 783 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 784 for (JCTypeParameter tvar : typarams) { 785 TypeVar a = (TypeVar)tvar.type; 786 a.tsym.flags_field |= UNATTRIBUTED; 787 a.bound = Type.noType; 788 if (!tvar.bounds.isEmpty()) { 789 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 790 for (JCExpression bound : tvar.bounds.tail) 791 bounds = bounds.prepend(attribType(bound, env)); 792 types.setBounds(a, bounds.reverse()); 793 } else { 794 // if no bounds are given, assume a single bound of 795 // java.lang.Object. 796 types.setBounds(a, List.of(syms.objectType)); 797 } 798 a.tsym.flags_field &= ~UNATTRIBUTED; 799 } 800 for (JCTypeParameter tvar : typarams) { 801 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 802 } 803 } 804 805 /** 806 * Attribute the type references in a list of annotations. 807 */ 808 void attribAnnotationTypes(List<JCAnnotation> annotations, 809 Env<AttrContext> env) { 810 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 811 JCAnnotation a = al.head; 812 attribType(a.annotationType, env); 813 } 814 } 815 816 /** 817 * Attribute a "lazy constant value". 818 * @param env The env for the const value 819 * @param variable The initializer for the const value 820 * @param type The expected type, or null 821 * @see VarSymbol#setLazyConstValue 822 */ 823 public Object attribLazyConstantValue(Env<AttrContext> env, 824 JCVariableDecl variable, 825 Type type) { 826 827 DiagnosticPosition prevLintPos 828 = deferredLintHandler.setPos(variable.pos()); 829 830 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 831 try { 832 Type itype = attribExpr(variable.init, env, type); 833 if (itype.constValue() != null) { 834 return coerce(itype, type).constValue(); 835 } else { 836 return null; 837 } 838 } finally { 839 log.useSource(prevSource); 840 deferredLintHandler.setPos(prevLintPos); 841 } 842 } 843 844 /** Attribute type reference in an `extends' or `implements' clause. 845 * Supertypes of anonymous inner classes are usually already attributed. 846 * 847 * @param tree The tree making up the type reference. 848 * @param env The environment current at the reference. 849 * @param classExpected true if only a class is expected here. 850 * @param interfaceExpected true if only an interface is expected here. 851 */ 852 Type attribBase(JCTree tree, 853 Env<AttrContext> env, 854 boolean classExpected, 855 boolean interfaceExpected, 856 boolean checkExtensible) { 857 Type t = tree.type != null ? 858 tree.type : 859 attribType(tree, env); 860 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 861 } 862 Type checkBase(Type t, 863 JCTree tree, 864 Env<AttrContext> env, 865 boolean classExpected, 866 boolean interfaceExpected, 867 boolean checkExtensible) { 868 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 869 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 870 if (t.tsym.isAnonymous()) { 871 log.error(pos, "cant.inherit.from.anon"); 872 return types.createErrorType(t); 873 } 874 if (t.isErroneous()) 875 return t; 876 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 877 // check that type variable is already visible 878 if (t.getUpperBound() == null) { 879 log.error(pos, "illegal.forward.ref"); 880 return types.createErrorType(t); 881 } 882 } else { 883 t = chk.checkClassType(pos, t, checkExtensible); 884 } 885 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 886 log.error(pos, "intf.expected.here"); 887 // return errType is necessary since otherwise there might 888 // be undetected cycles which cause attribution to loop 889 return types.createErrorType(t); 890 } else if (checkExtensible && 891 classExpected && 892 (t.tsym.flags() & INTERFACE) != 0) { 893 log.error(pos, "no.intf.expected.here"); 894 return types.createErrorType(t); 895 } 896 if (checkExtensible && 897 ((t.tsym.flags() & FINAL) != 0)) { 898 log.error(pos, 899 "cant.inherit.from.final", t.tsym); 900 } 901 chk.checkNonCyclic(pos, t); 902 return t; 903 } 904 905 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 906 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 907 id.type = env.info.scope.owner.enclClass().type; 908 id.sym = env.info.scope.owner.enclClass(); 909 return id.type; 910 } 911 912 public void visitClassDef(JCClassDecl tree) { 913 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 914 Optional.ofNullable(env.info.isSpeculative ? 915 argumentAttr.withLocalCacheContext() : null); 916 try { 917 // Local and anonymous classes have not been entered yet, so we need to 918 // do it now. 919 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 920 enter.classEnter(tree, env); 921 } else { 922 // If this class declaration is part of a class level annotation, 923 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 924 // order to simplify later steps and allow for sensible error 925 // messages. 926 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 927 enter.classEnter(tree, env); 928 } 929 930 ClassSymbol c = tree.sym; 931 if (c == null) { 932 // exit in case something drastic went wrong during enter. 933 result = null; 934 } else { 935 // make sure class has been completed: 936 c.complete(); 937 938 // If this class appears as an anonymous class 939 // in a superclass constructor call 940 // disable implicit outer instance from being passed. 941 // (This would be an illegal access to "this before super"). 942 if (env.info.isSelfCall && 943 env.tree.hasTag(NEWCLASS)) { 944 c.flags_field |= NOOUTERTHIS; 945 } 946 attribClass(tree.pos(), c); 947 result = tree.type = c.type; 948 } 949 } finally { 950 localCacheContext.ifPresent(LocalCacheContext::leave); 951 } 952 } 953 954 public void visitMethodDef(JCMethodDecl tree) { 955 MethodSymbol m = tree.sym; 956 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 957 958 Lint lint = env.info.lint.augment(m); 959 Lint prevLint = chk.setLint(lint); 960 MethodSymbol prevMethod = chk.setMethod(m); 961 try { 962 deferredLintHandler.flush(tree.pos()); 963 chk.checkDeprecatedAnnotation(tree.pos(), m); 964 965 966 // Create a new environment with local scope 967 // for attributing the method. 968 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 969 localEnv.info.lint = lint; 970 971 attribStats(tree.typarams, localEnv); 972 973 // If we override any other methods, check that we do so properly. 974 // JLS ??? 975 if (m.isStatic()) { 976 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 977 } else { 978 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 979 } 980 chk.checkOverride(env, tree, m); 981 982 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 983 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 984 } 985 986 // Enter all type parameters into the local method scope. 987 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 988 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 989 990 ClassSymbol owner = env.enclClass.sym; 991 if ((owner.flags() & ANNOTATION) != 0 && 992 (tree.params.nonEmpty() || 993 tree.recvparam != null)) 994 log.error(tree.params.nonEmpty() ? 995 tree.params.head.pos() : 996 tree.recvparam.pos(), 997 "intf.annotation.members.cant.have.params"); 998 999 // Attribute all value parameters. 1000 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 1001 attribStat(l.head, localEnv); 1002 } 1003 1004 chk.checkVarargsMethodDecl(localEnv, tree); 1005 1006 // Check that type parameters are well-formed. 1007 chk.validate(tree.typarams, localEnv); 1008 1009 // Check that result type is well-formed. 1010 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 1011 chk.validate(tree.restype, localEnv); 1012 1013 // Check that receiver type is well-formed. 1014 if (tree.recvparam != null) { 1015 // Use a new environment to check the receiver parameter. 1016 // Otherwise I get "might not have been initialized" errors. 1017 // Is there a better way? 1018 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1019 attribType(tree.recvparam, newEnv); 1020 chk.validate(tree.recvparam, newEnv); 1021 } 1022 1023 // annotation method checks 1024 if ((owner.flags() & ANNOTATION) != 0) { 1025 // annotation method cannot have throws clause 1026 if (tree.thrown.nonEmpty()) { 1027 log.error(tree.thrown.head.pos(), 1028 "throws.not.allowed.in.intf.annotation"); 1029 } 1030 // annotation method cannot declare type-parameters 1031 if (tree.typarams.nonEmpty()) { 1032 log.error(tree.typarams.head.pos(), 1033 "intf.annotation.members.cant.have.type.params"); 1034 } 1035 // validate annotation method's return type (could be an annotation type) 1036 chk.validateAnnotationType(tree.restype); 1037 // ensure that annotation method does not clash with members of Object/Annotation 1038 chk.validateAnnotationMethod(tree.pos(), m); 1039 } 1040 1041 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1042 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1043 1044 if (tree.body == null) { 1045 // Empty bodies are only allowed for 1046 // abstract, native, or interface methods, or for methods 1047 // in a retrofit signature class. 1048 if (tree.defaultValue != null) { 1049 if ((owner.flags() & ANNOTATION) == 0) 1050 log.error(tree.pos(), 1051 "default.allowed.in.intf.annotation.member"); 1052 } 1053 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1054 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1055 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1056 if ((owner.flags() & INTERFACE) != 0) { 1057 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1058 } else { 1059 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1060 } 1061 } else if ((tree.mods.flags & NATIVE) != 0) { 1062 log.error(tree.pos(), "native.meth.cant.have.body"); 1063 } else { 1064 // Add an implicit super() call unless an explicit call to 1065 // super(...) or this(...) is given 1066 // or we are compiling class java.lang.Object. 1067 if (tree.name == names.init && owner.type != syms.objectType) { 1068 JCBlock body = tree.body; 1069 if (body.stats.isEmpty() || 1070 !TreeInfo.isSelfCall(body.stats.head)) { 1071 body.stats = body.stats. 1072 prepend(typeEnter.SuperCall(make.at(body.pos), 1073 List.nil(), 1074 List.nil(), 1075 false)); 1076 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1077 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1078 TreeInfo.isSuperCall(body.stats.head)) { 1079 // enum constructors are not allowed to call super 1080 // directly, so make sure there aren't any super calls 1081 // in enum constructors, except in the compiler 1082 // generated one. 1083 log.error(tree.body.stats.head.pos(), 1084 "call.to.super.not.allowed.in.enum.ctor", 1085 env.enclClass.sym); 1086 } 1087 } 1088 1089 // Attribute all type annotations in the body 1090 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1091 annotate.flush(); 1092 1093 // Attribute method body. 1094 attribStat(tree.body, localEnv); 1095 } 1096 1097 localEnv.info.scope.leave(); 1098 result = tree.type = m.type; 1099 } finally { 1100 chk.setLint(prevLint); 1101 chk.setMethod(prevMethod); 1102 } 1103 } 1104 1105 public void visitVarDef(JCVariableDecl tree) { 1106 // Local variables have not been entered yet, so we need to do it now: 1107 if (env.info.scope.owner.kind == MTH) { 1108 if (tree.sym != null) { 1109 // parameters have already been entered 1110 env.info.scope.enter(tree.sym); 1111 } else { 1112 try { 1113 annotate.blockAnnotations(); 1114 memberEnter.memberEnter(tree, env); 1115 } finally { 1116 annotate.unblockAnnotations(); 1117 } 1118 } 1119 } else { 1120 if (tree.init != null) { 1121 // Field initializer expression need to be entered. 1122 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1123 annotate.flush(); 1124 } 1125 } 1126 1127 VarSymbol v = tree.sym; 1128 Lint lint = env.info.lint.augment(v); 1129 Lint prevLint = chk.setLint(lint); 1130 1131 // Check that the variable's declared type is well-formed. 1132 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1133 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1134 (tree.sym.flags() & PARAMETER) != 0; 1135 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1136 1137 try { 1138 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1139 deferredLintHandler.flush(tree.pos()); 1140 chk.checkDeprecatedAnnotation(tree.pos(), v); 1141 1142 if (tree.init != null) { 1143 if ((v.flags_field & FINAL) == 0 || 1144 !memberEnter.needsLazyConstValue(tree.init)) { 1145 // Not a compile-time constant 1146 // Attribute initializer in a new environment 1147 // with the declared variable as owner. 1148 // Check that initializer conforms to variable's declared type. 1149 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1150 initEnv.info.lint = lint; 1151 // In order to catch self-references, we set the variable's 1152 // declaration position to maximal possible value, effectively 1153 // marking the variable as undefined. 1154 initEnv.info.enclVar = v; 1155 attribExpr(tree.init, initEnv, v.type); 1156 } 1157 } 1158 result = tree.type = v.type; 1159 } 1160 finally { 1161 chk.setLint(prevLint); 1162 } 1163 } 1164 1165 public void visitSkip(JCSkip tree) { 1166 result = null; 1167 } 1168 1169 public void visitBlock(JCBlock tree) { 1170 if (env.info.scope.owner.kind == TYP) { 1171 // Block is a static or instance initializer; 1172 // let the owner of the environment be a freshly 1173 // created BLOCK-method. 1174 Symbol fakeOwner = 1175 new MethodSymbol(tree.flags | BLOCK | 1176 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1177 env.info.scope.owner); 1178 final Env<AttrContext> localEnv = 1179 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1180 1181 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1182 // Attribute all type annotations in the block 1183 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1184 annotate.flush(); 1185 attribStats(tree.stats, localEnv); 1186 1187 { 1188 // Store init and clinit type annotations with the ClassSymbol 1189 // to allow output in Gen.normalizeDefs. 1190 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1191 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1192 if ((tree.flags & STATIC) != 0) { 1193 cs.appendClassInitTypeAttributes(tas); 1194 } else { 1195 cs.appendInitTypeAttributes(tas); 1196 } 1197 } 1198 } else { 1199 // Create a new local environment with a local scope. 1200 Env<AttrContext> localEnv = 1201 env.dup(tree, env.info.dup(env.info.scope.dup())); 1202 try { 1203 attribStats(tree.stats, localEnv); 1204 } finally { 1205 localEnv.info.scope.leave(); 1206 } 1207 } 1208 result = null; 1209 } 1210 1211 public void visitDoLoop(JCDoWhileLoop tree) { 1212 attribStat(tree.body, env.dup(tree)); 1213 attribExpr(tree.cond, env, syms.booleanType); 1214 result = null; 1215 } 1216 1217 public void visitWhileLoop(JCWhileLoop tree) { 1218 attribExpr(tree.cond, env, syms.booleanType); 1219 attribStat(tree.body, env.dup(tree)); 1220 result = null; 1221 } 1222 1223 public void visitForLoop(JCForLoop tree) { 1224 Env<AttrContext> loopEnv = 1225 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1226 try { 1227 attribStats(tree.init, loopEnv); 1228 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1229 loopEnv.tree = tree; // before, we were not in loop! 1230 attribStats(tree.step, loopEnv); 1231 attribStat(tree.body, loopEnv); 1232 result = null; 1233 } 1234 finally { 1235 loopEnv.info.scope.leave(); 1236 } 1237 } 1238 1239 public void visitForeachLoop(JCEnhancedForLoop tree) { 1240 Env<AttrContext> loopEnv = 1241 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1242 try { 1243 //the Formal Parameter of a for-each loop is not in the scope when 1244 //attributing the for-each expression; we mimick this by attributing 1245 //the for-each expression first (against original scope). 1246 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1247 attribStat(tree.var, loopEnv); 1248 chk.checkNonVoid(tree.pos(), exprType); 1249 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1250 if (elemtype == null) { 1251 // or perhaps expr implements Iterable<T>? 1252 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1253 if (base == null) { 1254 log.error(tree.expr.pos(), 1255 "foreach.not.applicable.to.type", 1256 exprType, 1257 diags.fragment("type.req.array.or.iterable")); 1258 elemtype = types.createErrorType(exprType); 1259 } else { 1260 List<Type> iterableParams = base.allparams(); 1261 elemtype = iterableParams.isEmpty() 1262 ? syms.objectType 1263 : types.wildUpperBound(iterableParams.head); 1264 } 1265 } 1266 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1267 loopEnv.tree = tree; // before, we were not in loop! 1268 attribStat(tree.body, loopEnv); 1269 result = null; 1270 } 1271 finally { 1272 loopEnv.info.scope.leave(); 1273 } 1274 } 1275 1276 public void visitLabelled(JCLabeledStatement tree) { 1277 // Check that label is not used in an enclosing statement 1278 Env<AttrContext> env1 = env; 1279 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1280 if (env1.tree.hasTag(LABELLED) && 1281 ((JCLabeledStatement) env1.tree).label == tree.label) { 1282 log.error(tree.pos(), "label.already.in.use", 1283 tree.label); 1284 break; 1285 } 1286 env1 = env1.next; 1287 } 1288 1289 attribStat(tree.body, env.dup(tree)); 1290 result = null; 1291 } 1292 1293 public void visitSwitch(JCSwitch tree) { 1294 Type seltype = attribExpr(tree.selector, env); 1295 1296 Env<AttrContext> switchEnv = 1297 env.dup(tree, env.info.dup(env.info.scope.dup())); 1298 1299 try { 1300 1301 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1302 boolean stringSwitch = types.isSameType(seltype, syms.stringType); 1303 if (stringSwitch && !allowStringsInSwitch) { 1304 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1305 } 1306 if (!enumSwitch && !stringSwitch) 1307 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1308 1309 // Attribute all cases and 1310 // check that there are no duplicate case labels or default clauses. 1311 Set<Object> labels = new HashSet<>(); // The set of case labels. 1312 boolean hasDefault = false; // Is there a default label? 1313 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1314 JCCase c = l.head; 1315 if (c.pat != null) { 1316 if (enumSwitch) { 1317 Symbol sym = enumConstant(c.pat, seltype); 1318 if (sym == null) { 1319 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1320 } else if (!labels.add(sym)) { 1321 log.error(c.pos(), "duplicate.case.label"); 1322 } 1323 } else { 1324 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1325 if (!pattype.hasTag(ERROR)) { 1326 if (pattype.constValue() == null) { 1327 log.error(c.pat.pos(), 1328 (stringSwitch ? "string.const.req" : "const.expr.req")); 1329 } else if (!labels.add(pattype.constValue())) { 1330 log.error(c.pos(), "duplicate.case.label"); 1331 } 1332 } 1333 } 1334 } else if (hasDefault) { 1335 log.error(c.pos(), "duplicate.default.label"); 1336 } else { 1337 hasDefault = true; 1338 } 1339 Env<AttrContext> caseEnv = 1340 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1341 try { 1342 attribStats(c.stats, caseEnv); 1343 } finally { 1344 caseEnv.info.scope.leave(); 1345 addVars(c.stats, switchEnv.info.scope); 1346 } 1347 } 1348 1349 result = null; 1350 } 1351 finally { 1352 switchEnv.info.scope.leave(); 1353 } 1354 } 1355 // where 1356 /** Add any variables defined in stats to the switch scope. */ 1357 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1358 for (;stats.nonEmpty(); stats = stats.tail) { 1359 JCTree stat = stats.head; 1360 if (stat.hasTag(VARDEF)) 1361 switchScope.enter(((JCVariableDecl) stat).sym); 1362 } 1363 } 1364 // where 1365 /** Return the selected enumeration constant symbol, or null. */ 1366 private Symbol enumConstant(JCTree tree, Type enumType) { 1367 if (tree.hasTag(IDENT)) { 1368 JCIdent ident = (JCIdent)tree; 1369 Name name = ident.name; 1370 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1371 if (sym.kind == VAR) { 1372 Symbol s = ident.sym = sym; 1373 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1374 ident.type = s.type; 1375 return ((s.flags_field & Flags.ENUM) == 0) 1376 ? null : s; 1377 } 1378 } 1379 } 1380 return null; 1381 } 1382 1383 public void visitSynchronized(JCSynchronized tree) { 1384 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1385 attribStat(tree.body, env); 1386 result = null; 1387 } 1388 1389 public void visitTry(JCTry tree) { 1390 // Create a new local environment with a local 1391 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1392 try { 1393 boolean isTryWithResource = tree.resources.nonEmpty(); 1394 // Create a nested environment for attributing the try block if needed 1395 Env<AttrContext> tryEnv = isTryWithResource ? 1396 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1397 localEnv; 1398 try { 1399 // Attribute resource declarations 1400 for (JCTree resource : tree.resources) { 1401 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1402 @Override 1403 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1404 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1405 } 1406 }; 1407 ResultInfo twrResult = 1408 new ResultInfo(KindSelector.VAR, 1409 syms.autoCloseableType, 1410 twrContext); 1411 if (resource.hasTag(VARDEF)) { 1412 attribStat(resource, tryEnv); 1413 twrResult.check(resource, resource.type); 1414 1415 //check that resource type cannot throw InterruptedException 1416 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1417 1418 VarSymbol var = ((JCVariableDecl) resource).sym; 1419 var.setData(ElementKind.RESOURCE_VARIABLE); 1420 } else { 1421 attribTree(resource, tryEnv, twrResult); 1422 } 1423 } 1424 // Attribute body 1425 attribStat(tree.body, tryEnv); 1426 } finally { 1427 if (isTryWithResource) 1428 tryEnv.info.scope.leave(); 1429 } 1430 1431 // Attribute catch clauses 1432 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1433 JCCatch c = l.head; 1434 Env<AttrContext> catchEnv = 1435 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1436 try { 1437 Type ctype = attribStat(c.param, catchEnv); 1438 if (TreeInfo.isMultiCatch(c)) { 1439 //multi-catch parameter is implicitly marked as final 1440 c.param.sym.flags_field |= FINAL | UNION; 1441 } 1442 if (c.param.sym.kind == VAR) { 1443 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1444 } 1445 chk.checkType(c.param.vartype.pos(), 1446 chk.checkClassType(c.param.vartype.pos(), ctype), 1447 syms.throwableType); 1448 attribStat(c.body, catchEnv); 1449 } finally { 1450 catchEnv.info.scope.leave(); 1451 } 1452 } 1453 1454 // Attribute finalizer 1455 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1456 result = null; 1457 } 1458 finally { 1459 localEnv.info.scope.leave(); 1460 } 1461 } 1462 1463 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1464 if (!resource.isErroneous() && 1465 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1466 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1467 Symbol close = syms.noSymbol; 1468 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1469 try { 1470 close = rs.resolveQualifiedMethod(pos, 1471 env, 1472 types.skipTypeVars(resource, false), 1473 names.close, 1474 List.nil(), 1475 List.nil()); 1476 } 1477 finally { 1478 log.popDiagnosticHandler(discardHandler); 1479 } 1480 if (close.kind == MTH && 1481 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1482 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1483 env.info.lint.isEnabled(LintCategory.TRY)) { 1484 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1485 } 1486 } 1487 } 1488 1489 public void visitConditional(JCConditional tree) { 1490 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1491 1492 tree.polyKind = (!allowPoly || 1493 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1494 isBooleanOrNumeric(env, tree)) ? 1495 PolyKind.STANDALONE : PolyKind.POLY; 1496 1497 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1498 //this means we are returning a poly conditional from void-compatible lambda expression 1499 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1500 result = tree.type = types.createErrorType(resultInfo.pt); 1501 return; 1502 } 1503 1504 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1505 unknownExprInfo : 1506 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1507 1508 Type truetype = attribTree(tree.truepart, env, condInfo); 1509 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1510 1511 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1512 if (condtype.constValue() != null && 1513 truetype.constValue() != null && 1514 falsetype.constValue() != null && 1515 !owntype.hasTag(NONE)) { 1516 //constant folding 1517 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1518 } 1519 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1520 } 1521 //where 1522 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1523 switch (tree.getTag()) { 1524 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1525 ((JCLiteral)tree).typetag == BOOLEAN || 1526 ((JCLiteral)tree).typetag == BOT; 1527 case LAMBDA: case REFERENCE: return false; 1528 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1529 case CONDEXPR: 1530 JCConditional condTree = (JCConditional)tree; 1531 return isBooleanOrNumeric(env, condTree.truepart) && 1532 isBooleanOrNumeric(env, condTree.falsepart); 1533 case APPLY: 1534 JCMethodInvocation speculativeMethodTree = 1535 (JCMethodInvocation)deferredAttr.attribSpeculative( 1536 tree, env, unknownExprInfo, 1537 argumentAttr.withLocalCacheContext()); 1538 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1539 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1540 env.enclClass.type : 1541 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1542 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1543 return primitiveOrBoxed(owntype); 1544 case NEWCLASS: 1545 JCExpression className = 1546 removeClassParams.translate(((JCNewClass)tree).clazz); 1547 JCExpression speculativeNewClassTree = 1548 (JCExpression)deferredAttr.attribSpeculative( 1549 className, env, unknownTypeInfo, 1550 argumentAttr.withLocalCacheContext()); 1551 return primitiveOrBoxed(speculativeNewClassTree.type); 1552 default: 1553 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo, 1554 argumentAttr.withLocalCacheContext()).type; 1555 return primitiveOrBoxed(speculativeType); 1556 } 1557 } 1558 //where 1559 boolean primitiveOrBoxed(Type t) { 1560 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1561 } 1562 1563 TreeTranslator removeClassParams = new TreeTranslator() { 1564 @Override 1565 public void visitTypeApply(JCTypeApply tree) { 1566 result = translate(tree.clazz); 1567 } 1568 }; 1569 1570 CheckContext conditionalContext(CheckContext checkContext) { 1571 return new Check.NestedCheckContext(checkContext) { 1572 //this will use enclosing check context to check compatibility of 1573 //subexpression against target type; if we are in a method check context, 1574 //depending on whether boxing is allowed, we could have incompatibilities 1575 @Override 1576 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1577 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1578 } 1579 }; 1580 } 1581 1582 /** Compute the type of a conditional expression, after 1583 * checking that it exists. See JLS 15.25. Does not take into 1584 * account the special case where condition and both arms 1585 * are constants. 1586 * 1587 * @param pos The source position to be used for error 1588 * diagnostics. 1589 * @param thentype The type of the expression's then-part. 1590 * @param elsetype The type of the expression's else-part. 1591 */ 1592 Type condType(DiagnosticPosition pos, 1593 Type thentype, Type elsetype) { 1594 // If same type, that is the result 1595 if (types.isSameType(thentype, elsetype)) 1596 return thentype.baseType(); 1597 1598 Type thenUnboxed = (thentype.isPrimitive()) 1599 ? thentype : types.unboxedType(thentype); 1600 Type elseUnboxed = (elsetype.isPrimitive()) 1601 ? elsetype : types.unboxedType(elsetype); 1602 1603 // Otherwise, if both arms can be converted to a numeric 1604 // type, return the least numeric type that fits both arms 1605 // (i.e. return larger of the two, or return int if one 1606 // arm is short, the other is char). 1607 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1608 // If one arm has an integer subrange type (i.e., byte, 1609 // short, or char), and the other is an integer constant 1610 // that fits into the subrange, return the subrange type. 1611 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1612 elseUnboxed.hasTag(INT) && 1613 types.isAssignable(elseUnboxed, thenUnboxed)) { 1614 return thenUnboxed.baseType(); 1615 } 1616 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1617 thenUnboxed.hasTag(INT) && 1618 types.isAssignable(thenUnboxed, elseUnboxed)) { 1619 return elseUnboxed.baseType(); 1620 } 1621 1622 for (TypeTag tag : primitiveTags) { 1623 Type candidate = syms.typeOfTag[tag.ordinal()]; 1624 if (types.isSubtype(thenUnboxed, candidate) && 1625 types.isSubtype(elseUnboxed, candidate)) { 1626 return candidate; 1627 } 1628 } 1629 } 1630 1631 // Those were all the cases that could result in a primitive 1632 if (thentype.isPrimitive()) 1633 thentype = types.boxedClass(thentype).type; 1634 if (elsetype.isPrimitive()) 1635 elsetype = types.boxedClass(elsetype).type; 1636 1637 if (types.isSubtype(thentype, elsetype)) 1638 return elsetype.baseType(); 1639 if (types.isSubtype(elsetype, thentype)) 1640 return thentype.baseType(); 1641 1642 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1643 log.error(pos, "neither.conditional.subtype", 1644 thentype, elsetype); 1645 return thentype.baseType(); 1646 } 1647 1648 // both are known to be reference types. The result is 1649 // lub(thentype,elsetype). This cannot fail, as it will 1650 // always be possible to infer "Object" if nothing better. 1651 return types.lub(thentype.baseType(), elsetype.baseType()); 1652 } 1653 1654 final static TypeTag[] primitiveTags = new TypeTag[]{ 1655 BYTE, 1656 CHAR, 1657 SHORT, 1658 INT, 1659 LONG, 1660 FLOAT, 1661 DOUBLE, 1662 BOOLEAN, 1663 }; 1664 1665 public void visitIf(JCIf tree) { 1666 attribExpr(tree.cond, env, syms.booleanType); 1667 attribStat(tree.thenpart, env); 1668 if (tree.elsepart != null) 1669 attribStat(tree.elsepart, env); 1670 chk.checkEmptyIf(tree); 1671 result = null; 1672 } 1673 1674 public void visitExec(JCExpressionStatement tree) { 1675 //a fresh environment is required for 292 inference to work properly --- 1676 //see Infer.instantiatePolymorphicSignatureInstance() 1677 Env<AttrContext> localEnv = env.dup(tree); 1678 attribExpr(tree.expr, localEnv); 1679 result = null; 1680 } 1681 1682 public void visitBreak(JCBreak tree) { 1683 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1684 result = null; 1685 } 1686 1687 public void visitContinue(JCContinue tree) { 1688 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1689 result = null; 1690 } 1691 //where 1692 /** Return the target of a break or continue statement, if it exists, 1693 * report an error if not. 1694 * Note: The target of a labelled break or continue is the 1695 * (non-labelled) statement tree referred to by the label, 1696 * not the tree representing the labelled statement itself. 1697 * 1698 * @param pos The position to be used for error diagnostics 1699 * @param tag The tag of the jump statement. This is either 1700 * Tree.BREAK or Tree.CONTINUE. 1701 * @param label The label of the jump statement, or null if no 1702 * label is given. 1703 * @param env The environment current at the jump statement. 1704 */ 1705 private JCTree findJumpTarget(DiagnosticPosition pos, 1706 JCTree.Tag tag, 1707 Name label, 1708 Env<AttrContext> env) { 1709 // Search environments outwards from the point of jump. 1710 Env<AttrContext> env1 = env; 1711 LOOP: 1712 while (env1 != null) { 1713 switch (env1.tree.getTag()) { 1714 case LABELLED: 1715 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1716 if (label == labelled.label) { 1717 // If jump is a continue, check that target is a loop. 1718 if (tag == CONTINUE) { 1719 if (!labelled.body.hasTag(DOLOOP) && 1720 !labelled.body.hasTag(WHILELOOP) && 1721 !labelled.body.hasTag(FORLOOP) && 1722 !labelled.body.hasTag(FOREACHLOOP)) 1723 log.error(pos, "not.loop.label", label); 1724 // Found labelled statement target, now go inwards 1725 // to next non-labelled tree. 1726 return TreeInfo.referencedStatement(labelled); 1727 } else { 1728 return labelled; 1729 } 1730 } 1731 break; 1732 case DOLOOP: 1733 case WHILELOOP: 1734 case FORLOOP: 1735 case FOREACHLOOP: 1736 if (label == null) return env1.tree; 1737 break; 1738 case SWITCH: 1739 if (label == null && tag == BREAK) return env1.tree; 1740 break; 1741 case LAMBDA: 1742 case METHODDEF: 1743 case CLASSDEF: 1744 break LOOP; 1745 default: 1746 } 1747 env1 = env1.next; 1748 } 1749 if (label != null) 1750 log.error(pos, "undef.label", label); 1751 else if (tag == CONTINUE) 1752 log.error(pos, "cont.outside.loop"); 1753 else 1754 log.error(pos, "break.outside.switch.loop"); 1755 return null; 1756 } 1757 1758 public void visitReturn(JCReturn tree) { 1759 // Check that there is an enclosing method which is 1760 // nested within than the enclosing class. 1761 if (env.info.returnResult == null) { 1762 log.error(tree.pos(), "ret.outside.meth"); 1763 } else { 1764 // Attribute return expression, if it exists, and check that 1765 // it conforms to result type of enclosing method. 1766 if (tree.expr != null) { 1767 if (env.info.returnResult.pt.hasTag(VOID)) { 1768 env.info.returnResult.checkContext.report(tree.expr.pos(), 1769 diags.fragment("unexpected.ret.val")); 1770 } 1771 attribTree(tree.expr, env, env.info.returnResult); 1772 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1773 !env.info.returnResult.pt.hasTag(NONE)) { 1774 env.info.returnResult.checkContext.report(tree.pos(), 1775 diags.fragment("missing.ret.val")); 1776 } 1777 } 1778 result = null; 1779 } 1780 1781 public void visitThrow(JCThrow tree) { 1782 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1783 if (allowPoly) { 1784 chk.checkType(tree, owntype, syms.throwableType); 1785 } 1786 result = null; 1787 } 1788 1789 public void visitAssert(JCAssert tree) { 1790 attribExpr(tree.cond, env, syms.booleanType); 1791 if (tree.detail != null) { 1792 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1793 } 1794 result = null; 1795 } 1796 1797 /** Visitor method for method invocations. 1798 * NOTE: The method part of an application will have in its type field 1799 * the return type of the method, not the method's type itself! 1800 */ 1801 public void visitApply(JCMethodInvocation tree) { 1802 // The local environment of a method application is 1803 // a new environment nested in the current one. 1804 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1805 1806 // The types of the actual method arguments. 1807 List<Type> argtypes; 1808 1809 // The types of the actual method type arguments. 1810 List<Type> typeargtypes = null; 1811 1812 Name methName = TreeInfo.name(tree.meth); 1813 1814 boolean isConstructorCall = 1815 methName == names._this || methName == names._super; 1816 1817 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1818 if (isConstructorCall) { 1819 // We are seeing a ...this(...) or ...super(...) call. 1820 // Check that this is the first statement in a constructor. 1821 if (checkFirstConstructorStat(tree, env)) { 1822 1823 // Record the fact 1824 // that this is a constructor call (using isSelfCall). 1825 localEnv.info.isSelfCall = true; 1826 1827 // Attribute arguments, yielding list of argument types. 1828 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 1829 argtypes = argtypesBuf.toList(); 1830 typeargtypes = attribTypes(tree.typeargs, localEnv); 1831 1832 // Variable `site' points to the class in which the called 1833 // constructor is defined. 1834 Type site = env.enclClass.sym.type; 1835 if (methName == names._super) { 1836 if (site == syms.objectType) { 1837 log.error(tree.meth.pos(), "no.superclass", site); 1838 site = types.createErrorType(syms.objectType); 1839 } else { 1840 site = types.supertype(site); 1841 } 1842 } 1843 1844 if (site.hasTag(CLASS)) { 1845 Type encl = site.getEnclosingType(); 1846 while (encl != null && encl.hasTag(TYPEVAR)) 1847 encl = encl.getUpperBound(); 1848 if (encl.hasTag(CLASS)) { 1849 // we are calling a nested class 1850 1851 if (tree.meth.hasTag(SELECT)) { 1852 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1853 1854 // We are seeing a prefixed call, of the form 1855 // <expr>.super(...). 1856 // Check that the prefix expression conforms 1857 // to the outer instance type of the class. 1858 chk.checkRefType(qualifier.pos(), 1859 attribExpr(qualifier, localEnv, 1860 encl)); 1861 } else if (methName == names._super) { 1862 // qualifier omitted; check for existence 1863 // of an appropriate implicit qualifier. 1864 rs.resolveImplicitThis(tree.meth.pos(), 1865 localEnv, site, true); 1866 } 1867 } else if (tree.meth.hasTag(SELECT)) { 1868 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1869 site.tsym); 1870 } 1871 1872 // if we're calling a java.lang.Enum constructor, 1873 // prefix the implicit String and int parameters 1874 if (site.tsym == syms.enumSym) 1875 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1876 1877 // Resolve the called constructor under the assumption 1878 // that we are referring to a superclass instance of the 1879 // current instance (JLS ???). 1880 boolean selectSuperPrev = localEnv.info.selectSuper; 1881 localEnv.info.selectSuper = true; 1882 localEnv.info.pendingResolutionPhase = null; 1883 Symbol sym = rs.resolveConstructor( 1884 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1885 localEnv.info.selectSuper = selectSuperPrev; 1886 1887 // Set method symbol to resolved constructor... 1888 TreeInfo.setSymbol(tree.meth, sym); 1889 1890 // ...and check that it is legal in the current context. 1891 // (this will also set the tree's type) 1892 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1893 checkId(tree.meth, site, sym, localEnv, 1894 new ResultInfo(kind, mpt)); 1895 } 1896 // Otherwise, `site' is an error type and we do nothing 1897 } 1898 result = tree.type = syms.voidType; 1899 } else { 1900 // Otherwise, we are seeing a regular method call. 1901 // Attribute the arguments, yielding list of argument types, ... 1902 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1903 argtypes = argtypesBuf.toList(); 1904 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1905 1906 // ... and attribute the method using as a prototype a methodtype 1907 // whose formal argument types is exactly the list of actual 1908 // arguments (this will also set the method symbol). 1909 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1910 localEnv.info.pendingResolutionPhase = null; 1911 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1912 1913 // Compute the result type. 1914 Type restype = mtype.getReturnType(); 1915 if (restype.hasTag(WILDCARD)) 1916 throw new AssertionError(mtype); 1917 1918 Type qualifier = (tree.meth.hasTag(SELECT)) 1919 ? ((JCFieldAccess) tree.meth).selected.type 1920 : env.enclClass.sym.type; 1921 Symbol msym = TreeInfo.symbol(tree.meth); 1922 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 1923 1924 chk.checkRefTypes(tree.typeargs, typeargtypes); 1925 1926 // Check that value of resulting type is admissible in the 1927 // current context. Also, capture the return type 1928 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 1929 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 1930 } 1931 chk.validate(tree.typeargs, localEnv); 1932 } 1933 //where 1934 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1935 if (msym != null && 1936 msym.owner == syms.objectType.tsym && 1937 methodName == names.getClass && 1938 argtypes.isEmpty()) { 1939 // as a special case, x.getClass() has type Class<? extends |X|> 1940 return new ClassType(restype.getEnclosingType(), 1941 List.of(new WildcardType(types.erasure(qualifierType), 1942 BoundKind.EXTENDS, 1943 syms.boundClass)), 1944 restype.tsym, 1945 restype.getMetadata()); 1946 } else if (msym != null && 1947 msym.owner == syms.arrayClass && 1948 methodName == names.clone && 1949 types.isArray(qualifierType)) { 1950 // as a special case, array.clone() has a result that is 1951 // the same as static type of the array being cloned 1952 return qualifierType; 1953 } else { 1954 return restype; 1955 } 1956 } 1957 1958 /** Check that given application node appears as first statement 1959 * in a constructor call. 1960 * @param tree The application node 1961 * @param env The environment current at the application. 1962 */ 1963 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1964 JCMethodDecl enclMethod = env.enclMethod; 1965 if (enclMethod != null && enclMethod.name == names.init) { 1966 JCBlock body = enclMethod.body; 1967 if (body.stats.head.hasTag(EXEC) && 1968 ((JCExpressionStatement) body.stats.head).expr == tree) 1969 return true; 1970 } 1971 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1972 TreeInfo.name(tree.meth)); 1973 return false; 1974 } 1975 1976 /** Obtain a method type with given argument types. 1977 */ 1978 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1979 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass); 1980 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1981 } 1982 1983 public void visitNewClass(final JCNewClass tree) { 1984 Type owntype = types.createErrorType(tree.type); 1985 1986 // The local environment of a class creation is 1987 // a new environment nested in the current one. 1988 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1989 1990 // The anonymous inner class definition of the new expression, 1991 // if one is defined by it. 1992 JCClassDecl cdef = tree.def; 1993 1994 // If enclosing class is given, attribute it, and 1995 // complete class name to be fully qualified 1996 JCExpression clazz = tree.clazz; // Class field following new 1997 JCExpression clazzid; // Identifier in class field 1998 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1999 annoclazzid = null; 2000 2001 if (clazz.hasTag(TYPEAPPLY)) { 2002 clazzid = ((JCTypeApply) clazz).clazz; 2003 if (clazzid.hasTag(ANNOTATED_TYPE)) { 2004 annoclazzid = (JCAnnotatedType) clazzid; 2005 clazzid = annoclazzid.underlyingType; 2006 } 2007 } else { 2008 if (clazz.hasTag(ANNOTATED_TYPE)) { 2009 annoclazzid = (JCAnnotatedType) clazz; 2010 clazzid = annoclazzid.underlyingType; 2011 } else { 2012 clazzid = clazz; 2013 } 2014 } 2015 2016 JCExpression clazzid1 = clazzid; // The same in fully qualified form 2017 2018 if (tree.encl != null) { 2019 // We are seeing a qualified new, of the form 2020 // <expr>.new C <...> (...) ... 2021 // In this case, we let clazz stand for the name of the 2022 // allocated class C prefixed with the type of the qualifier 2023 // expression, so that we can 2024 // resolve it with standard techniques later. I.e., if 2025 // <expr> has type T, then <expr>.new C <...> (...) 2026 // yields a clazz T.C. 2027 Type encltype = chk.checkRefType(tree.encl.pos(), 2028 attribExpr(tree.encl, env)); 2029 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2030 // from expr to the combined type, or not? Yes, do this. 2031 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2032 ((JCIdent) clazzid).name); 2033 2034 EndPosTable endPosTable = this.env.toplevel.endPositions; 2035 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2036 if (clazz.hasTag(ANNOTATED_TYPE)) { 2037 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2038 List<JCAnnotation> annos = annoType.annotations; 2039 2040 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2041 clazzid1 = make.at(tree.pos). 2042 TypeApply(clazzid1, 2043 ((JCTypeApply) clazz).arguments); 2044 } 2045 2046 clazzid1 = make.at(tree.pos). 2047 AnnotatedType(annos, clazzid1); 2048 } else if (clazz.hasTag(TYPEAPPLY)) { 2049 clazzid1 = make.at(tree.pos). 2050 TypeApply(clazzid1, 2051 ((JCTypeApply) clazz).arguments); 2052 } 2053 2054 clazz = clazzid1; 2055 } 2056 2057 // Attribute clazz expression and store 2058 // symbol + type back into the attributed tree. 2059 Type clazztype; 2060 2061 try { 2062 env.info.isNewClass = true; 2063 clazztype = TreeInfo.isEnumInit(env.tree) ? 2064 attribIdentAsEnumType(env, (JCIdent)clazz) : 2065 attribType(clazz, env); 2066 } finally { 2067 env.info.isNewClass = false; 2068 } 2069 2070 clazztype = chk.checkDiamond(tree, clazztype); 2071 chk.validate(clazz, localEnv); 2072 if (tree.encl != null) { 2073 // We have to work in this case to store 2074 // symbol + type back into the attributed tree. 2075 tree.clazz.type = clazztype; 2076 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2077 clazzid.type = ((JCIdent) clazzid).sym.type; 2078 if (annoclazzid != null) { 2079 annoclazzid.type = clazzid.type; 2080 } 2081 if (!clazztype.isErroneous()) { 2082 if (cdef != null && clazztype.tsym.isInterface()) { 2083 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2084 } else if (clazztype.tsym.isStatic()) { 2085 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2086 } 2087 } 2088 } else if (!clazztype.tsym.isInterface() && 2089 clazztype.getEnclosingType().hasTag(CLASS)) { 2090 // Check for the existence of an apropos outer instance 2091 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2092 } 2093 2094 // Attribute constructor arguments. 2095 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2096 final KindSelector pkind = 2097 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2098 List<Type> argtypes = argtypesBuf.toList(); 2099 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2100 2101 // If we have made no mistakes in the class type... 2102 if (clazztype.hasTag(CLASS)) { 2103 // Enums may not be instantiated except implicitly 2104 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2105 (!env.tree.hasTag(VARDEF) || 2106 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2107 ((JCVariableDecl) env.tree).init != tree)) 2108 log.error(tree.pos(), "enum.cant.be.instantiated"); 2109 2110 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2111 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2112 boolean skipNonDiamondPath = false; 2113 // Check that class is not abstract 2114 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2115 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2116 log.error(tree.pos(), "abstract.cant.be.instantiated", 2117 clazztype.tsym); 2118 skipNonDiamondPath = true; 2119 } else if (cdef != null && clazztype.tsym.isInterface()) { 2120 // Check that no constructor arguments are given to 2121 // anonymous classes implementing an interface 2122 if (!argtypes.isEmpty()) 2123 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2124 2125 if (!typeargtypes.isEmpty()) 2126 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2127 2128 // Error recovery: pretend no arguments were supplied. 2129 argtypes = List.nil(); 2130 typeargtypes = List.nil(); 2131 skipNonDiamondPath = true; 2132 } 2133 if (TreeInfo.isDiamond(tree)) { 2134 ClassType site = new ClassType(clazztype.getEnclosingType(), 2135 clazztype.tsym.type.getTypeArguments(), 2136 clazztype.tsym, 2137 clazztype.getMetadata()); 2138 2139 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2140 diamondEnv.info.selectSuper = cdef != null; 2141 diamondEnv.info.pendingResolutionPhase = null; 2142 2143 //if the type of the instance creation expression is a class type 2144 //apply method resolution inference (JLS 15.12.2.7). The return type 2145 //of the resolved constructor will be a partially instantiated type 2146 Symbol constructor = rs.resolveDiamond(tree.pos(), 2147 diamondEnv, 2148 site, 2149 argtypes, 2150 typeargtypes); 2151 tree.constructor = constructor.baseSymbol(); 2152 2153 final TypeSymbol csym = clazztype.tsym; 2154 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2155 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2156 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2157 constructorType = checkId(tree, site, 2158 constructor, 2159 diamondEnv, 2160 diamondResult); 2161 2162 tree.clazz.type = types.createErrorType(clazztype); 2163 if (!constructorType.isErroneous()) { 2164 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2165 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2166 } 2167 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2168 } 2169 2170 // Resolve the called constructor under the assumption 2171 // that we are referring to a superclass instance of the 2172 // current instance (JLS ???). 2173 else if (!skipNonDiamondPath) { 2174 //the following code alters some of the fields in the current 2175 //AttrContext - hence, the current context must be dup'ed in 2176 //order to avoid downstream failures 2177 Env<AttrContext> rsEnv = localEnv.dup(tree); 2178 rsEnv.info.selectSuper = cdef != null; 2179 rsEnv.info.pendingResolutionPhase = null; 2180 tree.constructor = rs.resolveConstructor( 2181 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2182 if (cdef == null) { //do not check twice! 2183 tree.constructorType = checkId(tree, 2184 clazztype, 2185 tree.constructor, 2186 rsEnv, 2187 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2188 if (rsEnv.info.lastResolveVarargs()) 2189 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2190 } 2191 } 2192 2193 if (cdef != null) { 2194 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2195 return; 2196 } 2197 2198 if (tree.constructor != null && tree.constructor.kind == MTH) 2199 owntype = clazztype; 2200 } 2201 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2202 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2203 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2204 //we need to wait for inference to finish and then replace inference vars in the constructor type 2205 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2206 instantiatedContext -> { 2207 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2208 }); 2209 } 2210 chk.validate(tree.typeargs, localEnv); 2211 } 2212 2213 // where 2214 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2215 JCClassDecl cdef, Env<AttrContext> localEnv, 2216 List<Type> argtypes, List<Type> typeargtypes, 2217 KindSelector pkind) { 2218 // We are seeing an anonymous class instance creation. 2219 // In this case, the class instance creation 2220 // expression 2221 // 2222 // E.new <typeargs1>C<typargs2>(args) { ... } 2223 // 2224 // is represented internally as 2225 // 2226 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2227 // 2228 // This expression is then *transformed* as follows: 2229 // 2230 // (1) add an extends or implements clause 2231 // (2) add a constructor. 2232 // 2233 // For instance, if C is a class, and ET is the type of E, 2234 // the expression 2235 // 2236 // E.new <typeargs1>C<typargs2>(args) { ... } 2237 // 2238 // is translated to (where X is a fresh name and typarams is the 2239 // parameter list of the super constructor): 2240 // 2241 // new <typeargs1>X(<*nullchk*>E, args) where 2242 // X extends C<typargs2> { 2243 // <typarams> X(ET e, args) { 2244 // e.<typeargs1>super(args) 2245 // } 2246 // ... 2247 // } 2248 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2249 final boolean isDiamond = TreeInfo.isDiamond(tree); 2250 if (isDiamond 2251 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2252 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2253 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2254 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2255 instantiatedContext -> { 2256 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2257 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2258 ResultInfo prevResult = this.resultInfo; 2259 try { 2260 this.resultInfo = resultInfoForClassDefinition; 2261 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2262 localEnv, argtypes, typeargtypes, pkind); 2263 } finally { 2264 this.resultInfo = prevResult; 2265 } 2266 }); 2267 } else { 2268 if (isDiamond && clazztype.hasTag(CLASS)) { 2269 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2270 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2271 // One or more types inferred in the previous steps is non-denotable. 2272 Fragment fragment = Diamond(clazztype.tsym); 2273 log.error(tree.clazz.pos(), 2274 Errors.CantApplyDiamond1( 2275 fragment, 2276 invalidDiamondArgs.size() > 1 ? 2277 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2278 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2279 } 2280 // For <>(){}, inferred types must also be accessible. 2281 for (Type t : clazztype.getTypeArguments()) { 2282 rs.checkAccessibleType(env, t); 2283 } 2284 } 2285 2286 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2287 // false for isInterface call even when the original type is an interface. 2288 boolean implementing = clazztype.tsym.isInterface() || 2289 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2290 2291 if (implementing) { 2292 cdef.implementing = List.of(clazz); 2293 } else { 2294 cdef.extending = clazz; 2295 } 2296 2297 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2298 isSerializable(clazztype)) { 2299 localEnv.info.isSerializable = true; 2300 } 2301 2302 attribStat(cdef, localEnv); 2303 2304 List<Type> finalargtypes; 2305 // If an outer instance is given, 2306 // prefix it to the constructor arguments 2307 // and delete it from the new expression 2308 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2309 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2310 finalargtypes = argtypes.prepend(tree.encl.type); 2311 tree.encl = null; 2312 } else { 2313 finalargtypes = argtypes; 2314 } 2315 2316 // Reassign clazztype and recompute constructor. As this necessarily involves 2317 // another attribution pass for deferred types in the case of <>, replicate 2318 // them. Original arguments have right decorations already. 2319 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2320 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2321 } 2322 2323 clazztype = cdef.sym.type; 2324 Symbol sym = tree.constructor = rs.resolveConstructor( 2325 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2326 Assert.check(!sym.kind.isResolutionError()); 2327 tree.constructor = sym; 2328 tree.constructorType = checkId(tree, 2329 clazztype, 2330 tree.constructor, 2331 localEnv, 2332 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2333 } 2334 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2335 clazztype : types.createErrorType(tree.type); 2336 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2337 chk.validate(tree.typeargs, localEnv); 2338 } 2339 2340 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2341 return new Check.NestedCheckContext(checkContext) { 2342 @Override 2343 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2344 enclosingContext.report(clazz.clazz, 2345 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2346 } 2347 }; 2348 } 2349 2350 /** Make an attributed null check tree. 2351 */ 2352 public JCExpression makeNullCheck(JCExpression arg) { 2353 // optimization: new Outer() can never be null; skip null check 2354 if (arg.getTag() == NEWCLASS) 2355 return arg; 2356 // optimization: X.this is never null; skip null check 2357 Name name = TreeInfo.name(arg); 2358 if (name == names._this || name == names._super) return arg; 2359 2360 JCTree.Tag optag = NULLCHK; 2361 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2362 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2363 tree.type = arg.type; 2364 return tree; 2365 } 2366 2367 public void visitNewArray(JCNewArray tree) { 2368 Type owntype = types.createErrorType(tree.type); 2369 Env<AttrContext> localEnv = env.dup(tree); 2370 Type elemtype; 2371 if (tree.elemtype != null) { 2372 elemtype = attribType(tree.elemtype, localEnv); 2373 chk.validate(tree.elemtype, localEnv); 2374 owntype = elemtype; 2375 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2376 attribExpr(l.head, localEnv, syms.intType); 2377 owntype = new ArrayType(owntype, syms.arrayClass); 2378 } 2379 } else { 2380 // we are seeing an untyped aggregate { ... } 2381 // this is allowed only if the prototype is an array 2382 if (pt().hasTag(ARRAY)) { 2383 elemtype = types.elemtype(pt()); 2384 } else { 2385 if (!pt().hasTag(ERROR)) { 2386 log.error(tree.pos(), "illegal.initializer.for.type", 2387 pt()); 2388 } 2389 elemtype = types.createErrorType(pt()); 2390 } 2391 } 2392 if (tree.elems != null) { 2393 attribExprs(tree.elems, localEnv, elemtype); 2394 owntype = new ArrayType(elemtype, syms.arrayClass); 2395 } 2396 if (!types.isReifiable(elemtype)) 2397 log.error(tree.pos(), "generic.array.creation"); 2398 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2399 } 2400 2401 /* 2402 * A lambda expression can only be attributed when a target-type is available. 2403 * In addition, if the target-type is that of a functional interface whose 2404 * descriptor contains inference variables in argument position the lambda expression 2405 * is 'stuck' (see DeferredAttr). 2406 */ 2407 @Override 2408 public void visitLambda(final JCLambda that) { 2409 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2410 if (pt().hasTag(NONE)) { 2411 //lambda only allowed in assignment or method invocation/cast context 2412 log.error(that.pos(), "unexpected.lambda"); 2413 } 2414 result = that.type = types.createErrorType(pt()); 2415 return; 2416 } 2417 //create an environment for attribution of the lambda expression 2418 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2419 boolean needsRecovery = 2420 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2421 try { 2422 if (needsRecovery && isSerializable(pt())) { 2423 localEnv.info.isSerializable = true; 2424 localEnv.info.isLambda = true; 2425 } 2426 List<Type> explicitParamTypes = null; 2427 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2428 //attribute lambda parameters 2429 attribStats(that.params, localEnv); 2430 explicitParamTypes = TreeInfo.types(that.params); 2431 } 2432 2433 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2434 Type currentTarget = targetInfo.target; 2435 Type lambdaType = targetInfo.descriptor; 2436 2437 if (currentTarget.isErroneous()) { 2438 result = that.type = currentTarget; 2439 return; 2440 } 2441 2442 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2443 2444 if (lambdaType.hasTag(FORALL)) { 2445 //lambda expression target desc cannot be a generic method 2446 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2447 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2448 result = that.type = types.createErrorType(pt()); 2449 return; 2450 } 2451 2452 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2453 //add param type info in the AST 2454 List<Type> actuals = lambdaType.getParameterTypes(); 2455 List<JCVariableDecl> params = that.params; 2456 2457 boolean arityMismatch = false; 2458 2459 while (params.nonEmpty()) { 2460 if (actuals.isEmpty()) { 2461 //not enough actuals to perform lambda parameter inference 2462 arityMismatch = true; 2463 } 2464 //reset previously set info 2465 Type argType = arityMismatch ? 2466 syms.errType : 2467 actuals.head; 2468 params.head.vartype = make.at(params.head).Type(argType); 2469 params.head.sym = null; 2470 actuals = actuals.isEmpty() ? 2471 actuals : 2472 actuals.tail; 2473 params = params.tail; 2474 } 2475 2476 //attribute lambda parameters 2477 attribStats(that.params, localEnv); 2478 2479 if (arityMismatch) { 2480 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2481 result = that.type = types.createErrorType(currentTarget); 2482 return; 2483 } 2484 } 2485 2486 //from this point on, no recovery is needed; if we are in assignment context 2487 //we will be able to attribute the whole lambda body, regardless of errors; 2488 //if we are in a 'check' method context, and the lambda is not compatible 2489 //with the target-type, it will be recovered anyway in Attr.checkId 2490 needsRecovery = false; 2491 2492 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2493 lambdaBodyResult(that, lambdaType, resultInfo); 2494 2495 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2496 attribTree(that.getBody(), localEnv, bodyResultInfo); 2497 } else { 2498 JCBlock body = (JCBlock)that.body; 2499 attribStats(body.stats, localEnv); 2500 } 2501 2502 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2503 2504 boolean isSpeculativeRound = 2505 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2506 2507 preFlow(that); 2508 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2509 2510 that.type = currentTarget; //avoids recovery at this stage 2511 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2512 2513 if (!isSpeculativeRound) { 2514 //add thrown types as bounds to the thrown types free variables if needed: 2515 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2516 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2517 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2518 2519 chk.unhandled(inferredThrownTypes, thrownTypes); 2520 2521 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 2522 thrownTypes.stream() 2523 .filter(t -> t.hasTag(UNDETVAR)) 2524 .forEach(t -> ((UndetVar)t).setThrow()); 2525 } 2526 2527 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2528 } 2529 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2530 } catch (Types.FunctionDescriptorLookupError ex) { 2531 JCDiagnostic cause = ex.getDiagnostic(); 2532 resultInfo.checkContext.report(that, cause); 2533 result = that.type = types.createErrorType(pt()); 2534 return; 2535 } catch (Throwable t) { 2536 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2537 //as that would likely cause the same exception again. 2538 needsRecovery = false; 2539 throw t; 2540 } finally { 2541 localEnv.info.scope.leave(); 2542 if (needsRecovery) { 2543 attribTree(that, env, recoveryInfo); 2544 } 2545 } 2546 } 2547 //where 2548 class TargetInfo { 2549 Type target; 2550 Type descriptor; 2551 2552 public TargetInfo(Type target, Type descriptor) { 2553 this.target = target; 2554 this.descriptor = descriptor; 2555 } 2556 } 2557 2558 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2559 Type lambdaType; 2560 Type currentTarget = resultInfo.pt; 2561 if (resultInfo.pt != Type.recoveryType) { 2562 /* We need to adjust the target. If the target is an 2563 * intersection type, for example: SAM & I1 & I2 ... 2564 * the target will be updated to SAM 2565 */ 2566 currentTarget = targetChecker.visit(currentTarget, that); 2567 if (explicitParamTypes != null) { 2568 currentTarget = infer.instantiateFunctionalInterface(that, 2569 currentTarget, explicitParamTypes, resultInfo.checkContext); 2570 } 2571 currentTarget = types.removeWildcards(currentTarget); 2572 lambdaType = types.findDescriptorType(currentTarget); 2573 } else { 2574 currentTarget = Type.recoveryType; 2575 lambdaType = fallbackDescriptorType(that); 2576 } 2577 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2578 //lambda expression target desc cannot be a generic method 2579 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2580 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2581 currentTarget = types.createErrorType(pt()); 2582 } 2583 return new TargetInfo(currentTarget, lambdaType); 2584 } 2585 2586 void preFlow(JCLambda tree) { 2587 new PostAttrAnalyzer() { 2588 @Override 2589 public void scan(JCTree tree) { 2590 if (tree == null || 2591 (tree.type != null && 2592 tree.type == Type.stuckType)) { 2593 //don't touch stuck expressions! 2594 return; 2595 } 2596 super.scan(tree); 2597 } 2598 }.scan(tree); 2599 } 2600 2601 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2602 2603 @Override 2604 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2605 return t.isIntersection() ? 2606 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2607 } 2608 2609 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2610 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2611 Type target = null; 2612 for (Type bound : ict.getExplicitComponents()) { 2613 TypeSymbol boundSym = bound.tsym; 2614 if (types.isFunctionalInterface(boundSym) && 2615 types.findDescriptorSymbol(boundSym) == desc) { 2616 target = bound; 2617 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2618 //bound must be an interface 2619 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2620 } 2621 } 2622 return target != null ? 2623 target : 2624 ict.getExplicitComponents().head; //error recovery 2625 } 2626 2627 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2628 ListBuffer<Type> targs = new ListBuffer<>(); 2629 ListBuffer<Type> supertypes = new ListBuffer<>(); 2630 for (Type i : ict.interfaces_field) { 2631 if (i.isParameterized()) { 2632 targs.appendList(i.tsym.type.allparams()); 2633 } 2634 supertypes.append(i.tsym.type); 2635 } 2636 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2637 notionalIntf.allparams_field = targs.toList(); 2638 notionalIntf.tsym.flags_field |= INTERFACE; 2639 return notionalIntf.tsym; 2640 } 2641 2642 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2643 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2644 diags.fragment(key, args))); 2645 } 2646 }; 2647 2648 private Type fallbackDescriptorType(JCExpression tree) { 2649 switch (tree.getTag()) { 2650 case LAMBDA: 2651 JCLambda lambda = (JCLambda)tree; 2652 List<Type> argtypes = List.nil(); 2653 for (JCVariableDecl param : lambda.params) { 2654 argtypes = param.vartype != null ? 2655 argtypes.append(param.vartype.type) : 2656 argtypes.append(syms.errType); 2657 } 2658 return new MethodType(argtypes, Type.recoveryType, 2659 List.of(syms.throwableType), syms.methodClass); 2660 case REFERENCE: 2661 return new MethodType(List.nil(), Type.recoveryType, 2662 List.of(syms.throwableType), syms.methodClass); 2663 default: 2664 Assert.error("Cannot get here!"); 2665 } 2666 return null; 2667 } 2668 2669 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2670 final InferenceContext inferenceContext, final Type... ts) { 2671 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2672 } 2673 2674 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2675 final InferenceContext inferenceContext, final List<Type> ts) { 2676 if (inferenceContext.free(ts)) { 2677 inferenceContext.addFreeTypeListener(ts, 2678 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts))); 2679 } else { 2680 for (Type t : ts) { 2681 rs.checkAccessibleType(env, t); 2682 } 2683 } 2684 } 2685 2686 /** 2687 * Lambda/method reference have a special check context that ensures 2688 * that i.e. a lambda return type is compatible with the expected 2689 * type according to both the inherited context and the assignment 2690 * context. 2691 */ 2692 class FunctionalReturnContext extends Check.NestedCheckContext { 2693 2694 FunctionalReturnContext(CheckContext enclosingContext) { 2695 super(enclosingContext); 2696 } 2697 2698 @Override 2699 public boolean compatible(Type found, Type req, Warner warn) { 2700 //return type must be compatible in both current context and assignment context 2701 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 2702 } 2703 2704 @Override 2705 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2706 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2707 } 2708 } 2709 2710 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2711 2712 JCExpression expr; 2713 boolean expStmtExpected; 2714 2715 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2716 super(enclosingContext); 2717 this.expr = expr; 2718 } 2719 2720 @Override 2721 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2722 if (expStmtExpected) { 2723 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 2724 } else { 2725 super.report(pos, details); 2726 } 2727 } 2728 2729 @Override 2730 public boolean compatible(Type found, Type req, Warner warn) { 2731 //a void return is compatible with an expression statement lambda 2732 if (req.hasTag(VOID)) { 2733 expStmtExpected = true; 2734 return TreeInfo.isExpressionStatement(expr); 2735 } else { 2736 return super.compatible(found, req, warn); 2737 } 2738 } 2739 } 2740 2741 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2742 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2743 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2744 new FunctionalReturnContext(resultInfo.checkContext); 2745 2746 return descriptor.getReturnType() == Type.recoveryType ? 2747 recoveryInfo : 2748 new ResultInfo(KindSelector.VAL, 2749 descriptor.getReturnType(), funcContext); 2750 } 2751 2752 /** 2753 * Lambda compatibility. Check that given return types, thrown types, parameter types 2754 * are compatible with the expected functional interface descriptor. This means that: 2755 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2756 * types must be compatible with the return type of the expected descriptor. 2757 */ 2758 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2759 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2760 2761 //return values have already been checked - but if lambda has no return 2762 //values, we must ensure that void/value compatibility is correct; 2763 //this amounts at checking that, if a lambda body can complete normally, 2764 //the descriptor's return type must be void 2765 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2766 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2767 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2768 diags.fragment("missing.ret.val", returnType))); 2769 } 2770 2771 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2772 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2773 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2774 } 2775 } 2776 2777 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2778 * static field and that lambda has type annotations, these annotations will 2779 * also be stored at these fake clinit methods. 2780 * 2781 * LambdaToMethod also use fake clinit methods so they can be reused. 2782 * Also as LTM is a phase subsequent to attribution, the methods from 2783 * clinits can be safely removed by LTM to save memory. 2784 */ 2785 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2786 2787 public MethodSymbol removeClinit(ClassSymbol sym) { 2788 return clinits.remove(sym); 2789 } 2790 2791 /* This method returns an environment to be used to attribute a lambda 2792 * expression. 2793 * 2794 * The owner of this environment is a method symbol. If the current owner 2795 * is not a method, for example if the lambda is used to initialize 2796 * a field, then if the field is: 2797 * 2798 * - an instance field, we use the first constructor. 2799 * - a static field, we create a fake clinit method. 2800 */ 2801 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2802 Env<AttrContext> lambdaEnv; 2803 Symbol owner = env.info.scope.owner; 2804 if (owner.kind == VAR && owner.owner.kind == TYP) { 2805 //field initializer 2806 ClassSymbol enclClass = owner.enclClass(); 2807 Symbol newScopeOwner = env.info.scope.owner; 2808 /* if the field isn't static, then we can get the first constructor 2809 * and use it as the owner of the environment. This is what 2810 * LTM code is doing to look for type annotations so we are fine. 2811 */ 2812 if ((owner.flags() & STATIC) == 0) { 2813 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2814 newScopeOwner = s; 2815 break; 2816 } 2817 } else { 2818 /* if the field is static then we need to create a fake clinit 2819 * method, this method can later be reused by LTM. 2820 */ 2821 MethodSymbol clinit = clinits.get(enclClass); 2822 if (clinit == null) { 2823 Type clinitType = new MethodType(List.nil(), 2824 syms.voidType, List.nil(), syms.methodClass); 2825 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2826 names.clinit, clinitType, enclClass); 2827 clinit.params = List.nil(); 2828 clinits.put(enclClass, clinit); 2829 } 2830 newScopeOwner = clinit; 2831 } 2832 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2833 } else { 2834 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2835 } 2836 return lambdaEnv; 2837 } 2838 2839 @Override 2840 public void visitReference(final JCMemberReference that) { 2841 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2842 if (pt().hasTag(NONE)) { 2843 //method reference only allowed in assignment or method invocation/cast context 2844 log.error(that.pos(), "unexpected.mref"); 2845 } 2846 result = that.type = types.createErrorType(pt()); 2847 return; 2848 } 2849 final Env<AttrContext> localEnv = env.dup(that); 2850 try { 2851 //attribute member reference qualifier - if this is a constructor 2852 //reference, the expected kind must be a type 2853 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2854 2855 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2856 exprType = chk.checkConstructorRefType(that.expr, exprType); 2857 if (!exprType.isErroneous() && 2858 exprType.isRaw() && 2859 that.typeargs != null) { 2860 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2861 diags.fragment("mref.infer.and.explicit.params")); 2862 exprType = types.createErrorType(exprType); 2863 } 2864 } 2865 2866 if (exprType.isErroneous()) { 2867 //if the qualifier expression contains problems, 2868 //give up attribution of method reference 2869 result = that.type = exprType; 2870 return; 2871 } 2872 2873 if (TreeInfo.isStaticSelector(that.expr, names)) { 2874 //if the qualifier is a type, validate it; raw warning check is 2875 //omitted as we don't know at this stage as to whether this is a 2876 //raw selector (because of inference) 2877 chk.validate(that.expr, env, false); 2878 } else { 2879 Symbol lhsSym = TreeInfo.symbol(that.expr); 2880 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2881 } 2882 //attrib type-arguments 2883 List<Type> typeargtypes = List.nil(); 2884 if (that.typeargs != null) { 2885 typeargtypes = attribTypes(that.typeargs, localEnv); 2886 } 2887 2888 boolean isTargetSerializable = 2889 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2890 isSerializable(pt()); 2891 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2892 Type currentTarget = targetInfo.target; 2893 Type desc = targetInfo.descriptor; 2894 2895 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2896 List<Type> argtypes = desc.getParameterTypes(); 2897 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2898 2899 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2900 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2901 } 2902 2903 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2904 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2905 try { 2906 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2907 that.name, argtypes, typeargtypes, referenceCheck, 2908 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2909 } finally { 2910 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2911 } 2912 2913 Symbol refSym = refResult.fst; 2914 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2915 2916 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2917 * JDK-8075541 2918 */ 2919 if (refSym.kind != MTH) { 2920 boolean targetError; 2921 switch (refSym.kind) { 2922 case ABSENT_MTH: 2923 case MISSING_ENCL: 2924 targetError = false; 2925 break; 2926 case WRONG_MTH: 2927 case WRONG_MTHS: 2928 case AMBIGUOUS: 2929 case HIDDEN: 2930 case STATICERR: 2931 targetError = true; 2932 break; 2933 default: 2934 Assert.error("unexpected result kind " + refSym.kind); 2935 targetError = false; 2936 } 2937 2938 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2939 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2940 2941 JCDiagnostic.DiagnosticType diagKind = targetError ? 2942 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2943 2944 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2945 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2946 2947 if (targetError && currentTarget == Type.recoveryType) { 2948 //a target error doesn't make sense during recovery stage 2949 //as we don't know what actual parameter types are 2950 result = that.type = currentTarget; 2951 return; 2952 } else { 2953 if (targetError) { 2954 resultInfo.checkContext.report(that, diag); 2955 } else { 2956 log.report(diag); 2957 } 2958 result = that.type = types.createErrorType(currentTarget); 2959 return; 2960 } 2961 } 2962 2963 that.sym = refSym.baseSymbol(); 2964 that.kind = lookupHelper.referenceKind(that.sym); 2965 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2966 2967 if (desc.getReturnType() == Type.recoveryType) { 2968 // stop here 2969 result = that.type = currentTarget; 2970 return; 2971 } 2972 2973 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2974 Type enclosingType = exprType.getEnclosingType(); 2975 if (enclosingType != null && enclosingType.hasTag(CLASS)) { 2976 // Check for the existence of an apropriate outer instance 2977 rs.resolveImplicitThis(that.pos(), env, exprType); 2978 } 2979 } 2980 2981 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2982 2983 if (that.getMode() == ReferenceMode.INVOKE && 2984 TreeInfo.isStaticSelector(that.expr, names) && 2985 that.kind.isUnbound() && 2986 !desc.getParameterTypes().head.isParameterized()) { 2987 chk.checkRaw(that.expr, localEnv); 2988 } 2989 2990 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2991 exprType.getTypeArguments().nonEmpty()) { 2992 //static ref with class type-args 2993 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2994 diags.fragment("static.mref.with.targs")); 2995 result = that.type = types.createErrorType(currentTarget); 2996 return; 2997 } 2998 2999 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 3000 // Check that super-qualified symbols are not abstract (JLS) 3001 rs.checkNonAbstract(that.pos(), that.sym); 3002 } 3003 3004 if (isTargetSerializable) { 3005 chk.checkAccessFromSerializableElement(that, true); 3006 } 3007 } 3008 3009 ResultInfo checkInfo = 3010 resultInfo.dup(newMethodTemplate( 3011 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 3012 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 3013 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 3014 3015 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 3016 3017 if (that.kind.isUnbound() && 3018 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 3019 //re-generate inference constraints for unbound receiver 3020 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 3021 //cannot happen as this has already been checked - we just need 3022 //to regenerate the inference constraints, as that has been lost 3023 //as a result of the call to inferenceContext.save() 3024 Assert.error("Can't get here"); 3025 } 3026 } 3027 3028 if (!refType.isErroneous()) { 3029 refType = types.createMethodTypeWithReturn(refType, 3030 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3031 } 3032 3033 //go ahead with standard method reference compatibility check - note that param check 3034 //is a no-op (as this has been taken care during method applicability) 3035 boolean isSpeculativeRound = 3036 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3037 3038 that.type = currentTarget; //avoids recovery at this stage 3039 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3040 if (!isSpeculativeRound) { 3041 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3042 } 3043 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3044 } catch (Types.FunctionDescriptorLookupError ex) { 3045 JCDiagnostic cause = ex.getDiagnostic(); 3046 resultInfo.checkContext.report(that, cause); 3047 result = that.type = types.createErrorType(pt()); 3048 return; 3049 } 3050 } 3051 //where 3052 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3053 //if this is a constructor reference, the expected kind must be a type 3054 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3055 KindSelector.VAL_TYP : KindSelector.TYP, 3056 Type.noType); 3057 } 3058 3059 3060 @SuppressWarnings("fallthrough") 3061 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3062 InferenceContext inferenceContext = checkContext.inferenceContext(); 3063 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3064 3065 Type resType; 3066 switch (tree.getMode()) { 3067 case NEW: 3068 if (!tree.expr.type.isRaw()) { 3069 resType = tree.expr.type; 3070 break; 3071 } 3072 default: 3073 resType = refType.getReturnType(); 3074 } 3075 3076 Type incompatibleReturnType = resType; 3077 3078 if (returnType.hasTag(VOID)) { 3079 incompatibleReturnType = null; 3080 } 3081 3082 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3083 if (resType.isErroneous() || 3084 new FunctionalReturnContext(checkContext).compatible(resType, returnType, 3085 checkContext.checkWarner(tree, resType, returnType))) { 3086 incompatibleReturnType = null; 3087 } 3088 } 3089 3090 if (incompatibleReturnType != null) { 3091 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3092 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3093 } else { 3094 if (inferenceContext.free(refType)) { 3095 // we need to wait for inference to finish and then replace inference vars in the referent type 3096 inferenceContext.addFreeTypeListener(List.of(refType), 3097 instantiatedContext -> { 3098 tree.referentType = instantiatedContext.asInstType(refType); 3099 }); 3100 } else { 3101 tree.referentType = refType; 3102 } 3103 } 3104 3105 if (!speculativeAttr) { 3106 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3107 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3108 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3109 } 3110 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 3111 thrownTypes.stream() 3112 .filter(t -> t.hasTag(UNDETVAR)) 3113 .forEach(t -> ((UndetVar)t).setThrow()); 3114 } 3115 } 3116 3117 /** 3118 * Set functional type info on the underlying AST. Note: as the target descriptor 3119 * might contain inference variables, we might need to register an hook in the 3120 * current inference context. 3121 */ 3122 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3123 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3124 if (checkContext.inferenceContext().free(descriptorType)) { 3125 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), 3126 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3127 inferenceContext.asInstType(primaryTarget), checkContext)); 3128 } else { 3129 ListBuffer<Type> targets = new ListBuffer<>(); 3130 if (pt.hasTag(CLASS)) { 3131 if (pt.isCompound()) { 3132 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3133 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3134 if (t != primaryTarget) { 3135 targets.append(types.removeWildcards(t)); 3136 } 3137 } 3138 } else { 3139 targets.append(types.removeWildcards(primaryTarget)); 3140 } 3141 } 3142 fExpr.targets = targets.toList(); 3143 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3144 pt != Type.recoveryType) { 3145 //check that functional interface class is well-formed 3146 try { 3147 /* Types.makeFunctionalInterfaceClass() may throw an exception 3148 * when it's executed post-inference. See the listener code 3149 * above. 3150 */ 3151 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3152 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3153 if (csym != null) { 3154 chk.checkImplementations(env.tree, csym, csym); 3155 try { 3156 //perform an additional functional interface check on the synthetic class, 3157 //as there may be spurious errors for raw targets - because of existing issues 3158 //with membership and inheritance (see JDK-8074570). 3159 csym.flags_field |= INTERFACE; 3160 types.findDescriptorType(csym.type); 3161 } catch (FunctionDescriptorLookupError err) { 3162 resultInfo.checkContext.report(fExpr, 3163 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3164 } 3165 } 3166 } catch (Types.FunctionDescriptorLookupError ex) { 3167 JCDiagnostic cause = ex.getDiagnostic(); 3168 resultInfo.checkContext.report(env.tree, cause); 3169 } 3170 } 3171 } 3172 } 3173 3174 public void visitParens(JCParens tree) { 3175 Type owntype = attribTree(tree.expr, env, resultInfo); 3176 result = check(tree, owntype, pkind(), resultInfo); 3177 Symbol sym = TreeInfo.symbol(tree); 3178 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3179 log.error(tree.pos(), "illegal.start.of.type"); 3180 } 3181 3182 public void visitAssign(JCAssign tree) { 3183 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3184 Type capturedType = capture(owntype); 3185 attribExpr(tree.rhs, env, owntype); 3186 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3187 } 3188 3189 public void visitAssignop(JCAssignOp tree) { 3190 // Attribute arguments. 3191 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3192 Type operand = attribExpr(tree.rhs, env); 3193 // Find operator. 3194 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3195 if (operator != operators.noOpSymbol && 3196 !owntype.isErroneous() && 3197 !operand.isErroneous()) { 3198 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3199 chk.checkCastable(tree.rhs.pos(), 3200 operator.type.getReturnType(), 3201 owntype); 3202 } 3203 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3204 } 3205 3206 public void visitUnary(JCUnary tree) { 3207 // Attribute arguments. 3208 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3209 ? attribTree(tree.arg, env, varAssignmentInfo) 3210 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3211 3212 // Find operator. 3213 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3214 Type owntype = types.createErrorType(tree.type); 3215 if (operator != operators.noOpSymbol && 3216 !argtype.isErroneous()) { 3217 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3218 ? tree.arg.type 3219 : operator.type.getReturnType(); 3220 int opc = ((OperatorSymbol)operator).opcode; 3221 3222 // If the argument is constant, fold it. 3223 if (argtype.constValue() != null) { 3224 Type ctype = cfolder.fold1(opc, argtype); 3225 if (ctype != null) { 3226 owntype = cfolder.coerce(ctype, owntype); 3227 } 3228 } 3229 } 3230 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3231 } 3232 3233 public void visitBinary(JCBinary tree) { 3234 // Attribute arguments. 3235 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3236 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3237 // Find operator. 3238 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3239 Type owntype = types.createErrorType(tree.type); 3240 if (operator != operators.noOpSymbol && 3241 !left.isErroneous() && 3242 !right.isErroneous()) { 3243 owntype = operator.type.getReturnType(); 3244 int opc = ((OperatorSymbol)operator).opcode; 3245 // If both arguments are constants, fold them. 3246 if (left.constValue() != null && right.constValue() != null) { 3247 Type ctype = cfolder.fold2(opc, left, right); 3248 if (ctype != null) { 3249 owntype = cfolder.coerce(ctype, owntype); 3250 } 3251 } 3252 3253 // Check that argument types of a reference ==, != are 3254 // castable to each other, (JLS 15.21). Note: unboxing 3255 // comparisons will not have an acmp* opc at this point. 3256 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3257 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3258 log.error(tree.pos(), "incomparable.types", left, right); 3259 } 3260 } 3261 3262 chk.checkDivZero(tree.rhs.pos(), operator, right); 3263 } 3264 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3265 } 3266 3267 public void visitTypeCast(final JCTypeCast tree) { 3268 Type clazztype = attribType(tree.clazz, env); 3269 chk.validate(tree.clazz, env, false); 3270 //a fresh environment is required for 292 inference to work properly --- 3271 //see Infer.instantiatePolymorphicSignatureInstance() 3272 Env<AttrContext> localEnv = env.dup(tree); 3273 //should we propagate the target type? 3274 final ResultInfo castInfo; 3275 JCExpression expr = TreeInfo.skipParens(tree.expr); 3276 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3277 if (isPoly) { 3278 //expression is a poly - we need to propagate target type info 3279 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3280 new Check.NestedCheckContext(resultInfo.checkContext) { 3281 @Override 3282 public boolean compatible(Type found, Type req, Warner warn) { 3283 return types.isCastable(found, req, warn); 3284 } 3285 }); 3286 } else { 3287 //standalone cast - target-type info is not propagated 3288 castInfo = unknownExprInfo; 3289 } 3290 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3291 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3292 if (exprtype.constValue() != null) 3293 owntype = cfolder.coerce(exprtype, owntype); 3294 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3295 if (!isPoly) 3296 chk.checkRedundantCast(localEnv, tree); 3297 } 3298 3299 public void visitTypeTest(JCInstanceOf tree) { 3300 Type exprtype = chk.checkNullOrRefType( 3301 tree.expr.pos(), attribExpr(tree.expr, env)); 3302 Type clazztype = attribType(tree.clazz, env); 3303 if (!clazztype.hasTag(TYPEVAR)) { 3304 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3305 } 3306 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3307 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3308 clazztype = types.createErrorType(clazztype); 3309 } 3310 chk.validate(tree.clazz, env, false); 3311 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3312 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3313 } 3314 3315 public void visitIndexed(JCArrayAccess tree) { 3316 Type owntype = types.createErrorType(tree.type); 3317 Type atype = attribExpr(tree.indexed, env); 3318 attribExpr(tree.index, env, syms.intType); 3319 if (types.isArray(atype)) 3320 owntype = types.elemtype(atype); 3321 else if (!atype.hasTag(ERROR)) 3322 log.error(tree.pos(), "array.req.but.found", atype); 3323 if (!pkind().contains(KindSelector.VAL)) 3324 owntype = capture(owntype); 3325 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3326 } 3327 3328 public void visitIdent(JCIdent tree) { 3329 Symbol sym; 3330 3331 // Find symbol 3332 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3333 // If we are looking for a method, the prototype `pt' will be a 3334 // method type with the type of the call's arguments as parameters. 3335 env.info.pendingResolutionPhase = null; 3336 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3337 } else if (tree.sym != null && tree.sym.kind != VAR) { 3338 sym = tree.sym; 3339 } else { 3340 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3341 } 3342 tree.sym = sym; 3343 3344 // (1) Also find the environment current for the class where 3345 // sym is defined (`symEnv'). 3346 // Only for pre-tiger versions (1.4 and earlier): 3347 // (2) Also determine whether we access symbol out of an anonymous 3348 // class in a this or super call. This is illegal for instance 3349 // members since such classes don't carry a this$n link. 3350 // (`noOuterThisPath'). 3351 Env<AttrContext> symEnv = env; 3352 boolean noOuterThisPath = false; 3353 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3354 sym.kind.matches(KindSelector.VAL_MTH) && 3355 sym.owner.kind == TYP && 3356 tree.name != names._this && tree.name != names._super) { 3357 3358 // Find environment in which identifier is defined. 3359 while (symEnv.outer != null && 3360 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3361 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3362 noOuterThisPath = false; 3363 symEnv = symEnv.outer; 3364 } 3365 } 3366 3367 // If symbol is a variable, ... 3368 if (sym.kind == VAR) { 3369 VarSymbol v = (VarSymbol)sym; 3370 3371 // ..., evaluate its initializer, if it has one, and check for 3372 // illegal forward reference. 3373 checkInit(tree, env, v, false); 3374 3375 // If we are expecting a variable (as opposed to a value), check 3376 // that the variable is assignable in the current environment. 3377 if (KindSelector.ASG.subset(pkind())) 3378 checkAssignable(tree.pos(), v, null, env); 3379 } 3380 3381 // In a constructor body, 3382 // if symbol is a field or instance method, check that it is 3383 // not accessed before the supertype constructor is called. 3384 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3385 sym.kind.matches(KindSelector.VAL_MTH) && 3386 sym.owner.kind == TYP && 3387 (sym.flags() & STATIC) == 0) { 3388 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3389 sym : thisSym(tree.pos(), env)); 3390 } 3391 Env<AttrContext> env1 = env; 3392 if (sym.kind != ERR && sym.kind != TYP && 3393 sym.owner != null && sym.owner != env1.enclClass.sym) { 3394 // If the found symbol is inaccessible, then it is 3395 // accessed through an enclosing instance. Locate this 3396 // enclosing instance: 3397 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3398 env1 = env1.outer; 3399 } 3400 3401 if (env.info.isSerializable) { 3402 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3403 } 3404 3405 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3406 } 3407 3408 public void visitSelect(JCFieldAccess tree) { 3409 // Determine the expected kind of the qualifier expression. 3410 KindSelector skind = KindSelector.NIL; 3411 if (tree.name == names._this || tree.name == names._super || 3412 tree.name == names._class) 3413 { 3414 skind = KindSelector.TYP; 3415 } else { 3416 if (pkind().contains(KindSelector.PCK)) 3417 skind = KindSelector.of(skind, KindSelector.PCK); 3418 if (pkind().contains(KindSelector.TYP)) 3419 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3420 if (pkind().contains(KindSelector.VAL_MTH)) 3421 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3422 } 3423 3424 // Attribute the qualifier expression, and determine its symbol (if any). 3425 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3426 if (!pkind().contains(KindSelector.TYP_PCK)) 3427 site = capture(site); // Capture field access 3428 3429 // don't allow T.class T[].class, etc 3430 if (skind == KindSelector.TYP) { 3431 Type elt = site; 3432 while (elt.hasTag(ARRAY)) 3433 elt = ((ArrayType)elt).elemtype; 3434 if (elt.hasTag(TYPEVAR)) { 3435 log.error(tree.pos(), "type.var.cant.be.deref"); 3436 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3437 tree.sym = tree.type.tsym; 3438 return ; 3439 } 3440 } 3441 3442 // If qualifier symbol is a type or `super', assert `selectSuper' 3443 // for the selection. This is relevant for determining whether 3444 // protected symbols are accessible. 3445 Symbol sitesym = TreeInfo.symbol(tree.selected); 3446 boolean selectSuperPrev = env.info.selectSuper; 3447 env.info.selectSuper = 3448 sitesym != null && 3449 sitesym.name == names._super; 3450 3451 // Determine the symbol represented by the selection. 3452 env.info.pendingResolutionPhase = null; 3453 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3454 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3455 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3456 sym = syms.errSymbol; 3457 } 3458 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3459 site = capture(site); 3460 sym = selectSym(tree, sitesym, site, env, resultInfo); 3461 } 3462 boolean varArgs = env.info.lastResolveVarargs(); 3463 tree.sym = sym; 3464 3465 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3466 site = types.skipTypeVars(site, true); 3467 } 3468 3469 // If that symbol is a variable, ... 3470 if (sym.kind == VAR) { 3471 VarSymbol v = (VarSymbol)sym; 3472 3473 // ..., evaluate its initializer, if it has one, and check for 3474 // illegal forward reference. 3475 checkInit(tree, env, v, true); 3476 3477 // If we are expecting a variable (as opposed to a value), check 3478 // that the variable is assignable in the current environment. 3479 if (KindSelector.ASG.subset(pkind())) 3480 checkAssignable(tree.pos(), v, tree.selected, env); 3481 } 3482 3483 if (sitesym != null && 3484 sitesym.kind == VAR && 3485 ((VarSymbol)sitesym).isResourceVariable() && 3486 sym.kind == MTH && 3487 sym.name.equals(names.close) && 3488 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3489 env.info.lint.isEnabled(LintCategory.TRY)) { 3490 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3491 } 3492 3493 // Disallow selecting a type from an expression 3494 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3495 tree.type = check(tree.selected, pt(), 3496 sitesym == null ? 3497 KindSelector.VAL : sitesym.kind.toSelector(), 3498 new ResultInfo(KindSelector.TYP_PCK, pt())); 3499 } 3500 3501 if (isType(sitesym)) { 3502 if (sym.name == names._this) { 3503 // If `C' is the currently compiled class, check that 3504 // C.this' does not appear in a call to a super(...) 3505 if (env.info.isSelfCall && 3506 site.tsym == env.enclClass.sym) { 3507 chk.earlyRefError(tree.pos(), sym); 3508 } 3509 } else { 3510 // Check if type-qualified fields or methods are static (JLS) 3511 if ((sym.flags() & STATIC) == 0 && 3512 sym.name != names._super && 3513 (sym.kind == VAR || sym.kind == MTH)) { 3514 rs.accessBase(rs.new StaticError(sym), 3515 tree.pos(), site, sym.name, true); 3516 } 3517 } 3518 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3519 sym.isStatic() && sym.kind == MTH) { 3520 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3521 } 3522 } else if (sym.kind != ERR && 3523 (sym.flags() & STATIC) != 0 && 3524 sym.name != names._class) { 3525 // If the qualified item is not a type and the selected item is static, report 3526 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3527 chk.warnStatic(tree, "static.not.qualified.by.type", 3528 sym.kind.kindName(), sym.owner); 3529 } 3530 3531 // If we are selecting an instance member via a `super', ... 3532 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3533 3534 // Check that super-qualified symbols are not abstract (JLS) 3535 rs.checkNonAbstract(tree.pos(), sym); 3536 3537 if (site.isRaw()) { 3538 // Determine argument types for site. 3539 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3540 if (site1 != null) site = site1; 3541 } 3542 } 3543 3544 if (env.info.isSerializable) { 3545 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3546 } 3547 3548 env.info.selectSuper = selectSuperPrev; 3549 result = checkId(tree, site, sym, env, resultInfo); 3550 } 3551 //where 3552 /** Determine symbol referenced by a Select expression, 3553 * 3554 * @param tree The select tree. 3555 * @param site The type of the selected expression, 3556 * @param env The current environment. 3557 * @param resultInfo The current result. 3558 */ 3559 private Symbol selectSym(JCFieldAccess tree, 3560 Symbol location, 3561 Type site, 3562 Env<AttrContext> env, 3563 ResultInfo resultInfo) { 3564 DiagnosticPosition pos = tree.pos(); 3565 Name name = tree.name; 3566 switch (site.getTag()) { 3567 case PACKAGE: 3568 return rs.accessBase( 3569 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3570 pos, location, site, name, true); 3571 case ARRAY: 3572 case CLASS: 3573 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3574 return rs.resolveQualifiedMethod( 3575 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3576 } else if (name == names._this || name == names._super) { 3577 return rs.resolveSelf(pos, env, site.tsym, name); 3578 } else if (name == names._class) { 3579 // In this case, we have already made sure in 3580 // visitSelect that qualifier expression is a type. 3581 Type t = syms.classType; 3582 List<Type> typeargs = List.of(types.erasure(site)); 3583 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3584 return new VarSymbol( 3585 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3586 } else { 3587 // We are seeing a plain identifier as selector. 3588 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3589 sym = rs.accessBase(sym, pos, location, site, name, true); 3590 return sym; 3591 } 3592 case WILDCARD: 3593 throw new AssertionError(tree); 3594 case TYPEVAR: 3595 // Normally, site.getUpperBound() shouldn't be null. 3596 // It should only happen during memberEnter/attribBase 3597 // when determining the super type which *must* beac 3598 // done before attributing the type variables. In 3599 // other words, we are seeing this illegal program: 3600 // class B<T> extends A<T.foo> {} 3601 Symbol sym = (site.getUpperBound() != null) 3602 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3603 : null; 3604 if (sym == null) { 3605 log.error(pos, "type.var.cant.be.deref"); 3606 return syms.errSymbol; 3607 } else { 3608 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3609 rs.new AccessError(env, site, sym) : 3610 sym; 3611 rs.accessBase(sym2, pos, location, site, name, true); 3612 return sym; 3613 } 3614 case ERROR: 3615 // preserve identifier names through errors 3616 return types.createErrorType(name, site.tsym, site).tsym; 3617 default: 3618 // The qualifier expression is of a primitive type -- only 3619 // .class is allowed for these. 3620 if (name == names._class) { 3621 // In this case, we have already made sure in Select that 3622 // qualifier expression is a type. 3623 Type t = syms.classType; 3624 Type arg = types.boxedClass(site).type; 3625 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3626 return new VarSymbol( 3627 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3628 } else { 3629 log.error(pos, "cant.deref", site); 3630 return syms.errSymbol; 3631 } 3632 } 3633 } 3634 3635 /** Determine type of identifier or select expression and check that 3636 * (1) the referenced symbol is not deprecated 3637 * (2) the symbol's type is safe (@see checkSafe) 3638 * (3) if symbol is a variable, check that its type and kind are 3639 * compatible with the prototype and protokind. 3640 * (4) if symbol is an instance field of a raw type, 3641 * which is being assigned to, issue an unchecked warning if its 3642 * type changes under erasure. 3643 * (5) if symbol is an instance method of a raw type, issue an 3644 * unchecked warning if its argument types change under erasure. 3645 * If checks succeed: 3646 * If symbol is a constant, return its constant type 3647 * else if symbol is a method, return its result type 3648 * otherwise return its type. 3649 * Otherwise return errType. 3650 * 3651 * @param tree The syntax tree representing the identifier 3652 * @param site If this is a select, the type of the selected 3653 * expression, otherwise the type of the current class. 3654 * @param sym The symbol representing the identifier. 3655 * @param env The current environment. 3656 * @param resultInfo The expected result 3657 */ 3658 Type checkId(JCTree tree, 3659 Type site, 3660 Symbol sym, 3661 Env<AttrContext> env, 3662 ResultInfo resultInfo) { 3663 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3664 checkMethodId(tree, site, sym, env, resultInfo) : 3665 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3666 } 3667 3668 Type checkMethodId(JCTree tree, 3669 Type site, 3670 Symbol sym, 3671 Env<AttrContext> env, 3672 ResultInfo resultInfo) { 3673 boolean isPolymorhicSignature = 3674 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3675 return isPolymorhicSignature ? 3676 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3677 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3678 } 3679 3680 Type checkSigPolyMethodId(JCTree tree, 3681 Type site, 3682 Symbol sym, 3683 Env<AttrContext> env, 3684 ResultInfo resultInfo) { 3685 //recover original symbol for signature polymorphic methods 3686 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3687 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3688 return sym.type; 3689 } 3690 3691 Type checkMethodIdInternal(JCTree tree, 3692 Type site, 3693 Symbol sym, 3694 Env<AttrContext> env, 3695 ResultInfo resultInfo) { 3696 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3697 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3698 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3699 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3700 return owntype; 3701 } else { 3702 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3703 } 3704 } 3705 3706 Type checkIdInternal(JCTree tree, 3707 Type site, 3708 Symbol sym, 3709 Type pt, 3710 Env<AttrContext> env, 3711 ResultInfo resultInfo) { 3712 if (pt.isErroneous()) { 3713 return types.createErrorType(site); 3714 } 3715 Type owntype; // The computed type of this identifier occurrence. 3716 switch (sym.kind) { 3717 case TYP: 3718 // For types, the computed type equals the symbol's type, 3719 // except for two situations: 3720 owntype = sym.type; 3721 if (owntype.hasTag(CLASS)) { 3722 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3723 Type ownOuter = owntype.getEnclosingType(); 3724 3725 // (a) If the symbol's type is parameterized, erase it 3726 // because no type parameters were given. 3727 // We recover generic outer type later in visitTypeApply. 3728 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3729 owntype = types.erasure(owntype); 3730 } 3731 3732 // (b) If the symbol's type is an inner class, then 3733 // we have to interpret its outer type as a superclass 3734 // of the site type. Example: 3735 // 3736 // class Tree<A> { class Visitor { ... } } 3737 // class PointTree extends Tree<Point> { ... } 3738 // ...PointTree.Visitor... 3739 // 3740 // Then the type of the last expression above is 3741 // Tree<Point>.Visitor. 3742 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3743 Type normOuter = site; 3744 if (normOuter.hasTag(CLASS)) { 3745 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3746 } 3747 if (normOuter == null) // perhaps from an import 3748 normOuter = types.erasure(ownOuter); 3749 if (normOuter != ownOuter) 3750 owntype = new ClassType( 3751 normOuter, List.nil(), owntype.tsym, 3752 owntype.getMetadata()); 3753 } 3754 } 3755 break; 3756 case VAR: 3757 VarSymbol v = (VarSymbol)sym; 3758 // Test (4): if symbol is an instance field of a raw type, 3759 // which is being assigned to, issue an unchecked warning if 3760 // its type changes under erasure. 3761 if (KindSelector.ASG.subset(pkind()) && 3762 v.owner.kind == TYP && 3763 (v.flags() & STATIC) == 0 && 3764 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3765 Type s = types.asOuterSuper(site, v.owner); 3766 if (s != null && 3767 s.isRaw() && 3768 !types.isSameType(v.type, v.erasure(types))) { 3769 chk.warnUnchecked(tree.pos(), 3770 "unchecked.assign.to.var", 3771 v, s); 3772 } 3773 } 3774 // The computed type of a variable is the type of the 3775 // variable symbol, taken as a member of the site type. 3776 owntype = (sym.owner.kind == TYP && 3777 sym.name != names._this && sym.name != names._super) 3778 ? types.memberType(site, sym) 3779 : sym.type; 3780 3781 // If the variable is a constant, record constant value in 3782 // computed type. 3783 if (v.getConstValue() != null && isStaticReference(tree)) 3784 owntype = owntype.constType(v.getConstValue()); 3785 3786 if (resultInfo.pkind == KindSelector.VAL) { 3787 owntype = capture(owntype); // capture "names as expressions" 3788 } 3789 break; 3790 case MTH: { 3791 owntype = checkMethod(site, sym, 3792 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode), 3793 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3794 resultInfo.pt.getTypeArguments()); 3795 break; 3796 } 3797 case PCK: case ERR: 3798 owntype = sym.type; 3799 break; 3800 default: 3801 throw new AssertionError("unexpected kind: " + sym.kind + 3802 " in tree " + tree); 3803 } 3804 3805 // Emit a `deprecation' warning if symbol is deprecated. 3806 // (for constructors (but not for constructor references), the error 3807 // was given when the constructor was resolved) 3808 3809 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3810 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3811 chk.checkSunAPI(tree.pos(), sym); 3812 chk.checkProfile(tree.pos(), sym); 3813 } 3814 3815 // If symbol is a variable, check that its type and 3816 // kind are compatible with the prototype and protokind. 3817 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3818 } 3819 3820 /** Check that variable is initialized and evaluate the variable's 3821 * initializer, if not yet done. Also check that variable is not 3822 * referenced before it is defined. 3823 * @param tree The tree making up the variable reference. 3824 * @param env The current environment. 3825 * @param v The variable's symbol. 3826 */ 3827 private void checkInit(JCTree tree, 3828 Env<AttrContext> env, 3829 VarSymbol v, 3830 boolean onlyWarning) { 3831 // A forward reference is diagnosed if the declaration position 3832 // of the variable is greater than the current tree position 3833 // and the tree and variable definition occur in the same class 3834 // definition. Note that writes don't count as references. 3835 // This check applies only to class and instance 3836 // variables. Local variables follow different scope rules, 3837 // and are subject to definite assignment checking. 3838 Env<AttrContext> initEnv = enclosingInitEnv(env); 3839 if (initEnv != null && 3840 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3841 v.owner.kind == TYP && 3842 v.owner == env.info.scope.owner.enclClass() && 3843 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3844 (!env.tree.hasTag(ASSIGN) || 3845 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3846 String suffix = (initEnv.info.enclVar == v) ? 3847 "self.ref" : "forward.ref"; 3848 if (!onlyWarning || isStaticEnumField(v)) { 3849 log.error(tree.pos(), "illegal." + suffix); 3850 } else if (useBeforeDeclarationWarning) { 3851 log.warning(tree.pos(), suffix, v); 3852 } 3853 } 3854 3855 v.getConstValue(); // ensure initializer is evaluated 3856 3857 checkEnumInitializer(tree, env, v); 3858 } 3859 3860 /** 3861 * Returns the enclosing init environment associated with this env (if any). An init env 3862 * can be either a field declaration env or a static/instance initializer env. 3863 */ 3864 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3865 while (true) { 3866 switch (env.tree.getTag()) { 3867 case VARDEF: 3868 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3869 if (vdecl.sym.owner.kind == TYP) { 3870 //field 3871 return env; 3872 } 3873 break; 3874 case BLOCK: 3875 if (env.next.tree.hasTag(CLASSDEF)) { 3876 //instance/static initializer 3877 return env; 3878 } 3879 break; 3880 case METHODDEF: 3881 case CLASSDEF: 3882 case TOPLEVEL: 3883 return null; 3884 } 3885 Assert.checkNonNull(env.next); 3886 env = env.next; 3887 } 3888 } 3889 3890 /** 3891 * Check for illegal references to static members of enum. In 3892 * an enum type, constructors and initializers may not 3893 * reference its static members unless they are constant. 3894 * 3895 * @param tree The tree making up the variable reference. 3896 * @param env The current environment. 3897 * @param v The variable's symbol. 3898 * @jls section 8.9 Enums 3899 */ 3900 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3901 // JLS: 3902 // 3903 // "It is a compile-time error to reference a static field 3904 // of an enum type that is not a compile-time constant 3905 // (15.28) from constructors, instance initializer blocks, 3906 // or instance variable initializer expressions of that 3907 // type. It is a compile-time error for the constructors, 3908 // instance initializer blocks, or instance variable 3909 // initializer expressions of an enum constant e to refer 3910 // to itself or to an enum constant of the same type that 3911 // is declared to the right of e." 3912 if (isStaticEnumField(v)) { 3913 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3914 3915 if (enclClass == null || enclClass.owner == null) 3916 return; 3917 3918 // See if the enclosing class is the enum (or a 3919 // subclass thereof) declaring v. If not, this 3920 // reference is OK. 3921 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3922 return; 3923 3924 // If the reference isn't from an initializer, then 3925 // the reference is OK. 3926 if (!Resolve.isInitializer(env)) 3927 return; 3928 3929 log.error(tree.pos(), "illegal.enum.static.ref"); 3930 } 3931 } 3932 3933 /** Is the given symbol a static, non-constant field of an Enum? 3934 * Note: enum literals should not be regarded as such 3935 */ 3936 private boolean isStaticEnumField(VarSymbol v) { 3937 return Flags.isEnum(v.owner) && 3938 Flags.isStatic(v) && 3939 !Flags.isConstant(v) && 3940 v.name != names._class; 3941 } 3942 3943 /** 3944 * Check that method arguments conform to its instantiation. 3945 **/ 3946 public Type checkMethod(Type site, 3947 final Symbol sym, 3948 ResultInfo resultInfo, 3949 Env<AttrContext> env, 3950 final List<JCExpression> argtrees, 3951 List<Type> argtypes, 3952 List<Type> typeargtypes) { 3953 // Test (5): if symbol is an instance method of a raw type, issue 3954 // an unchecked warning if its argument types change under erasure. 3955 if ((sym.flags() & STATIC) == 0 && 3956 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3957 Type s = types.asOuterSuper(site, sym.owner); 3958 if (s != null && s.isRaw() && 3959 !types.isSameTypes(sym.type.getParameterTypes(), 3960 sym.erasure(types).getParameterTypes())) { 3961 chk.warnUnchecked(env.tree.pos(), 3962 "unchecked.call.mbr.of.raw.type", 3963 sym, s); 3964 } 3965 } 3966 3967 if (env.info.defaultSuperCallSite != null) { 3968 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3969 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3970 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3971 List<MethodSymbol> icand_sup = 3972 types.interfaceCandidates(sup, (MethodSymbol)sym); 3973 if (icand_sup.nonEmpty() && 3974 icand_sup.head != sym && 3975 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3976 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3977 diags.fragment("overridden.default", sym, sup)); 3978 break; 3979 } 3980 } 3981 env.info.defaultSuperCallSite = null; 3982 } 3983 3984 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3985 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3986 if (app.meth.hasTag(SELECT) && 3987 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3988 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3989 } 3990 } 3991 3992 // Compute the identifier's instantiated type. 3993 // For methods, we need to compute the instance type by 3994 // Resolve.instantiate from the symbol's type as well as 3995 // any type arguments and value arguments. 3996 Warner noteWarner = new Warner(); 3997 try { 3998 Type owntype = rs.checkMethod( 3999 env, 4000 site, 4001 sym, 4002 resultInfo, 4003 argtypes, 4004 typeargtypes, 4005 noteWarner); 4006 4007 DeferredAttr.DeferredTypeMap checkDeferredMap = 4008 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 4009 4010 argtypes = argtypes.map(checkDeferredMap); 4011 4012 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 4013 chk.warnUnchecked(env.tree.pos(), 4014 "unchecked.meth.invocation.applied", 4015 kindName(sym), 4016 sym.name, 4017 rs.methodArguments(sym.type.getParameterTypes()), 4018 rs.methodArguments(argtypes.map(checkDeferredMap)), 4019 kindName(sym.location()), 4020 sym.location()); 4021 if (resultInfo.pt != Infer.anyPoly || 4022 !owntype.hasTag(METHOD) || 4023 !owntype.isPartial()) { 4024 //if this is not a partially inferred method type, erase return type. Otherwise, 4025 //erasure is carried out in PartiallyInferredMethodType.check(). 4026 owntype = new MethodType(owntype.getParameterTypes(), 4027 types.erasure(owntype.getReturnType()), 4028 types.erasure(owntype.getThrownTypes()), 4029 syms.methodClass); 4030 } 4031 } 4032 4033 PolyKind pkind = (sym.type.hasTag(FORALL) && 4034 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 4035 PolyKind.POLY : PolyKind.STANDALONE; 4036 TreeInfo.setPolyKind(env.tree, pkind); 4037 4038 return (resultInfo.pt == Infer.anyPoly) ? 4039 owntype : 4040 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4041 resultInfo.checkContext.inferenceContext()); 4042 } catch (Infer.InferenceException ex) { 4043 //invalid target type - propagate exception outwards or report error 4044 //depending on the current check context 4045 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 4046 return types.createErrorType(site); 4047 } catch (Resolve.InapplicableMethodException ex) { 4048 final JCDiagnostic diag = ex.getDiagnostic(); 4049 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 4050 @Override 4051 protected Pair<Symbol, JCDiagnostic> errCandidate() { 4052 return new Pair<>(sym, diag); 4053 } 4054 }; 4055 List<Type> argtypes2 = argtypes.map( 4056 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4057 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 4058 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 4059 log.report(errDiag); 4060 return types.createErrorType(site); 4061 } 4062 } 4063 4064 public void visitLiteral(JCLiteral tree) { 4065 result = check(tree, litType(tree.typetag).constType(tree.value), 4066 KindSelector.VAL, resultInfo); 4067 } 4068 //where 4069 /** Return the type of a literal with given type tag. 4070 */ 4071 Type litType(TypeTag tag) { 4072 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4073 } 4074 4075 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4076 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4077 } 4078 4079 public void visitTypeArray(JCArrayTypeTree tree) { 4080 Type etype = attribType(tree.elemtype, env); 4081 Type type = new ArrayType(etype, syms.arrayClass); 4082 result = check(tree, type, KindSelector.TYP, resultInfo); 4083 } 4084 4085 /** Visitor method for parameterized types. 4086 * Bound checking is left until later, since types are attributed 4087 * before supertype structure is completely known 4088 */ 4089 public void visitTypeApply(JCTypeApply tree) { 4090 Type owntype = types.createErrorType(tree.type); 4091 4092 // Attribute functor part of application and make sure it's a class. 4093 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4094 4095 // Attribute type parameters 4096 List<Type> actuals = attribTypes(tree.arguments, env); 4097 4098 if (clazztype.hasTag(CLASS)) { 4099 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4100 if (actuals.isEmpty()) //diamond 4101 actuals = formals; 4102 4103 if (actuals.length() == formals.length()) { 4104 List<Type> a = actuals; 4105 List<Type> f = formals; 4106 while (a.nonEmpty()) { 4107 a.head = a.head.withTypeVar(f.head); 4108 a = a.tail; 4109 f = f.tail; 4110 } 4111 // Compute the proper generic outer 4112 Type clazzOuter = clazztype.getEnclosingType(); 4113 if (clazzOuter.hasTag(CLASS)) { 4114 Type site; 4115 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4116 if (clazz.hasTag(IDENT)) { 4117 site = env.enclClass.sym.type; 4118 } else if (clazz.hasTag(SELECT)) { 4119 site = ((JCFieldAccess) clazz).selected.type; 4120 } else throw new AssertionError(""+tree); 4121 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4122 if (site.hasTag(CLASS)) 4123 site = types.asOuterSuper(site, clazzOuter.tsym); 4124 if (site == null) 4125 site = types.erasure(clazzOuter); 4126 clazzOuter = site; 4127 } 4128 } 4129 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4130 clazztype.getMetadata()); 4131 } else { 4132 if (formals.length() != 0) { 4133 log.error(tree.pos(), "wrong.number.type.args", 4134 Integer.toString(formals.length())); 4135 } else { 4136 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4137 } 4138 owntype = types.createErrorType(tree.type); 4139 } 4140 } 4141 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4142 } 4143 4144 public void visitTypeUnion(JCTypeUnion tree) { 4145 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4146 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4147 for (JCExpression typeTree : tree.alternatives) { 4148 Type ctype = attribType(typeTree, env); 4149 ctype = chk.checkType(typeTree.pos(), 4150 chk.checkClassType(typeTree.pos(), ctype), 4151 syms.throwableType); 4152 if (!ctype.isErroneous()) { 4153 //check that alternatives of a union type are pairwise 4154 //unrelated w.r.t. subtyping 4155 if (chk.intersects(ctype, multicatchTypes.toList())) { 4156 for (Type t : multicatchTypes) { 4157 boolean sub = types.isSubtype(ctype, t); 4158 boolean sup = types.isSubtype(t, ctype); 4159 if (sub || sup) { 4160 //assume 'a' <: 'b' 4161 Type a = sub ? ctype : t; 4162 Type b = sub ? t : ctype; 4163 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4164 } 4165 } 4166 } 4167 multicatchTypes.append(ctype); 4168 if (all_multicatchTypes != null) 4169 all_multicatchTypes.append(ctype); 4170 } else { 4171 if (all_multicatchTypes == null) { 4172 all_multicatchTypes = new ListBuffer<>(); 4173 all_multicatchTypes.appendList(multicatchTypes); 4174 } 4175 all_multicatchTypes.append(ctype); 4176 } 4177 } 4178 Type t = check(tree, types.lub(multicatchTypes.toList()), 4179 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4180 if (t.hasTag(CLASS)) { 4181 List<Type> alternatives = 4182 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4183 t = new UnionClassType((ClassType) t, alternatives); 4184 } 4185 tree.type = result = t; 4186 } 4187 4188 public void visitTypeIntersection(JCTypeIntersection tree) { 4189 attribTypes(tree.bounds, env); 4190 tree.type = result = checkIntersection(tree, tree.bounds); 4191 } 4192 4193 public void visitTypeParameter(JCTypeParameter tree) { 4194 TypeVar typeVar = (TypeVar) tree.type; 4195 4196 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4197 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4198 } 4199 4200 if (!typeVar.bound.isErroneous()) { 4201 //fixup type-parameter bound computed in 'attribTypeVariables' 4202 typeVar.bound = checkIntersection(tree, tree.bounds); 4203 } 4204 } 4205 4206 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4207 Set<Type> boundSet = new HashSet<>(); 4208 if (bounds.nonEmpty()) { 4209 // accept class or interface or typevar as first bound. 4210 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4211 boundSet.add(types.erasure(bounds.head.type)); 4212 if (bounds.head.type.isErroneous()) { 4213 return bounds.head.type; 4214 } 4215 else if (bounds.head.type.hasTag(TYPEVAR)) { 4216 // if first bound was a typevar, do not accept further bounds. 4217 if (bounds.tail.nonEmpty()) { 4218 log.error(bounds.tail.head.pos(), 4219 "type.var.may.not.be.followed.by.other.bounds"); 4220 return bounds.head.type; 4221 } 4222 } else { 4223 // if first bound was a class or interface, accept only interfaces 4224 // as further bounds. 4225 for (JCExpression bound : bounds.tail) { 4226 bound.type = checkBase(bound.type, bound, env, false, true, false); 4227 if (bound.type.isErroneous()) { 4228 bounds = List.of(bound); 4229 } 4230 else if (bound.type.hasTag(CLASS)) { 4231 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4232 } 4233 } 4234 } 4235 } 4236 4237 if (bounds.length() == 0) { 4238 return syms.objectType; 4239 } else if (bounds.length() == 1) { 4240 return bounds.head.type; 4241 } else { 4242 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4243 // ... the variable's bound is a class type flagged COMPOUND 4244 // (see comment for TypeVar.bound). 4245 // In this case, generate a class tree that represents the 4246 // bound class, ... 4247 JCExpression extending; 4248 List<JCExpression> implementing; 4249 if (!bounds.head.type.isInterface()) { 4250 extending = bounds.head; 4251 implementing = bounds.tail; 4252 } else { 4253 extending = null; 4254 implementing = bounds; 4255 } 4256 JCClassDecl cd = make.at(tree).ClassDef( 4257 make.Modifiers(PUBLIC | ABSTRACT), 4258 names.empty, List.nil(), 4259 extending, implementing, List.nil()); 4260 4261 ClassSymbol c = (ClassSymbol)owntype.tsym; 4262 Assert.check((c.flags() & COMPOUND) != 0); 4263 cd.sym = c; 4264 c.sourcefile = env.toplevel.sourcefile; 4265 4266 // ... and attribute the bound class 4267 c.flags_field |= UNATTRIBUTED; 4268 Env<AttrContext> cenv = enter.classEnv(cd, env); 4269 typeEnvs.put(c, cenv); 4270 attribClass(c); 4271 return owntype; 4272 } 4273 } 4274 4275 public void visitWildcard(JCWildcard tree) { 4276 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4277 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4278 ? syms.objectType 4279 : attribType(tree.inner, env); 4280 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4281 tree.kind.kind, 4282 syms.boundClass), 4283 KindSelector.TYP, resultInfo); 4284 } 4285 4286 public void visitAnnotation(JCAnnotation tree) { 4287 Assert.error("should be handled in annotate"); 4288 } 4289 4290 public void visitAnnotatedType(JCAnnotatedType tree) { 4291 attribAnnotationTypes(tree.annotations, env); 4292 Type underlyingType = attribType(tree.underlyingType, env); 4293 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4294 4295 if (!env.info.isNewClass) 4296 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4297 result = tree.type = annotatedType; 4298 } 4299 4300 public void visitErroneous(JCErroneous tree) { 4301 if (tree.errs != null) 4302 for (JCTree err : tree.errs) 4303 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4304 result = tree.type = syms.errType; 4305 } 4306 4307 /** Default visitor method for all other trees. 4308 */ 4309 public void visitTree(JCTree tree) { 4310 throw new AssertionError(); 4311 } 4312 4313 /** 4314 * Attribute an env for either a top level tree or class or module declaration. 4315 */ 4316 public void attrib(Env<AttrContext> env) { 4317 switch (env.tree.getTag()) { 4318 case MODULEDEF: 4319 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4320 break; 4321 case TOPLEVEL: 4322 attribTopLevel(env); 4323 break; 4324 case PACKAGEDEF: 4325 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge); 4326 break; 4327 default: 4328 attribClass(env.tree.pos(), env.enclClass.sym); 4329 } 4330 } 4331 4332 /** 4333 * Attribute a top level tree. These trees are encountered when the 4334 * package declaration has annotations. 4335 */ 4336 public void attribTopLevel(Env<AttrContext> env) { 4337 JCCompilationUnit toplevel = env.toplevel; 4338 try { 4339 annotate.flush(); 4340 } catch (CompletionFailure ex) { 4341 chk.completionError(toplevel.pos(), ex); 4342 } 4343 } 4344 4345 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) { 4346 try { 4347 annotate.flush(); 4348 attribPackage(p); 4349 } catch (CompletionFailure ex) { 4350 chk.completionError(pos, ex); 4351 } 4352 } 4353 4354 void attribPackage(PackageSymbol p) { 4355 Env<AttrContext> env = typeEnvs.get(p); 4356 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p); 4357 } 4358 4359 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4360 try { 4361 annotate.flush(); 4362 attribModule(m); 4363 } catch (CompletionFailure ex) { 4364 chk.completionError(pos, ex); 4365 } 4366 } 4367 4368 void attribModule(ModuleSymbol m) { 4369 // Get environment current at the point of module definition. 4370 Env<AttrContext> env = enter.typeEnvs.get(m); 4371 attribStat(env.tree, env); 4372 } 4373 4374 /** Main method: attribute class definition associated with given class symbol. 4375 * reporting completion failures at the given position. 4376 * @param pos The source position at which completion errors are to be 4377 * reported. 4378 * @param c The class symbol whose definition will be attributed. 4379 */ 4380 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4381 try { 4382 annotate.flush(); 4383 attribClass(c); 4384 } catch (CompletionFailure ex) { 4385 chk.completionError(pos, ex); 4386 } 4387 } 4388 4389 /** Attribute class definition associated with given class symbol. 4390 * @param c The class symbol whose definition will be attributed. 4391 */ 4392 void attribClass(ClassSymbol c) throws CompletionFailure { 4393 if (c.type.hasTag(ERROR)) return; 4394 4395 // Check for cycles in the inheritance graph, which can arise from 4396 // ill-formed class files. 4397 chk.checkNonCyclic(null, c.type); 4398 4399 Type st = types.supertype(c.type); 4400 if ((c.flags_field & Flags.COMPOUND) == 0) { 4401 // First, attribute superclass. 4402 if (st.hasTag(CLASS)) 4403 attribClass((ClassSymbol)st.tsym); 4404 4405 // Next attribute owner, if it is a class. 4406 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4407 attribClass((ClassSymbol)c.owner); 4408 } 4409 4410 // The previous operations might have attributed the current class 4411 // if there was a cycle. So we test first whether the class is still 4412 // UNATTRIBUTED. 4413 if ((c.flags_field & UNATTRIBUTED) != 0) { 4414 c.flags_field &= ~UNATTRIBUTED; 4415 4416 // Get environment current at the point of class definition. 4417 Env<AttrContext> env = typeEnvs.get(c); 4418 4419 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4420 // because the annotations were not available at the time the env was created. Therefore, 4421 // we look up the environment chain for the first enclosing environment for which the 4422 // lint value is set. Typically, this is the parent env, but might be further if there 4423 // are any envs created as a result of TypeParameter nodes. 4424 Env<AttrContext> lintEnv = env; 4425 while (lintEnv.info.lint == null) 4426 lintEnv = lintEnv.next; 4427 4428 // Having found the enclosing lint value, we can initialize the lint value for this class 4429 env.info.lint = lintEnv.info.lint.augment(c); 4430 4431 Lint prevLint = chk.setLint(env.info.lint); 4432 JavaFileObject prev = log.useSource(c.sourcefile); 4433 ResultInfo prevReturnRes = env.info.returnResult; 4434 4435 try { 4436 deferredLintHandler.flush(env.tree); 4437 env.info.returnResult = null; 4438 // java.lang.Enum may not be subclassed by a non-enum 4439 if (st.tsym == syms.enumSym && 4440 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4441 log.error(env.tree.pos(), "enum.no.subclassing"); 4442 4443 // Enums may not be extended by source-level classes 4444 if (st.tsym != null && 4445 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4446 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4447 log.error(env.tree.pos(), "enum.types.not.extensible"); 4448 } 4449 4450 if (isSerializable(c.type)) { 4451 env.info.isSerializable = true; 4452 } 4453 4454 attribClassBody(env, c); 4455 4456 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4457 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4458 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4459 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree); 4460 } finally { 4461 env.info.returnResult = prevReturnRes; 4462 log.useSource(prev); 4463 chk.setLint(prevLint); 4464 } 4465 4466 } 4467 } 4468 4469 public void visitImport(JCImport tree) { 4470 // nothing to do 4471 } 4472 4473 public void visitModuleDef(JCModuleDecl tree) { 4474 tree.sym.completeUsesProvides(); 4475 ModuleSymbol msym = tree.sym; 4476 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym); 4477 Lint prevLint = chk.setLint(lint); 4478 chk.checkModuleName(tree); 4479 chk.checkDeprecatedAnnotation(tree, msym); 4480 4481 try { 4482 deferredLintHandler.flush(tree.pos()); 4483 } finally { 4484 chk.setLint(prevLint); 4485 } 4486 } 4487 4488 /** Finish the attribution of a class. */ 4489 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4490 JCClassDecl tree = (JCClassDecl)env.tree; 4491 Assert.check(c == tree.sym); 4492 4493 // Validate type parameters, supertype and interfaces. 4494 attribStats(tree.typarams, env); 4495 if (!c.isAnonymous()) { 4496 //already checked if anonymous 4497 chk.validate(tree.typarams, env); 4498 chk.validate(tree.extending, env); 4499 chk.validate(tree.implementing, env); 4500 } 4501 4502 c.markAbstractIfNeeded(types); 4503 4504 // If this is a non-abstract class, check that it has no abstract 4505 // methods or unimplemented methods of an implemented interface. 4506 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4507 chk.checkAllDefined(tree.pos(), c); 4508 } 4509 4510 if ((c.flags() & ANNOTATION) != 0) { 4511 if (tree.implementing.nonEmpty()) 4512 log.error(tree.implementing.head.pos(), 4513 "cant.extend.intf.annotation"); 4514 if (tree.typarams.nonEmpty()) 4515 log.error(tree.typarams.head.pos(), 4516 "intf.annotation.cant.have.type.params"); 4517 4518 // If this annotation type has a @Repeatable, validate 4519 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4520 // If this annotation type has a @Repeatable, validate 4521 if (repeatable != null) { 4522 // get diagnostic position for error reporting 4523 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4524 Assert.checkNonNull(cbPos); 4525 4526 chk.validateRepeatable(c, repeatable, cbPos); 4527 } 4528 } else { 4529 // Check that all extended classes and interfaces 4530 // are compatible (i.e. no two define methods with same arguments 4531 // yet different return types). (JLS 8.4.6.3) 4532 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4533 if (allowDefaultMethods) { 4534 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4535 } 4536 } 4537 4538 // Check that class does not import the same parameterized interface 4539 // with two different argument lists. 4540 chk.checkClassBounds(tree.pos(), c.type); 4541 4542 tree.type = c.type; 4543 4544 for (List<JCTypeParameter> l = tree.typarams; 4545 l.nonEmpty(); l = l.tail) { 4546 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4547 } 4548 4549 // Check that a generic class doesn't extend Throwable 4550 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4551 log.error(tree.extending.pos(), "generic.throwable"); 4552 4553 // Check that all methods which implement some 4554 // method conform to the method they implement. 4555 chk.checkImplementations(tree); 4556 4557 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4558 checkAutoCloseable(tree.pos(), env, c.type); 4559 4560 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4561 // Attribute declaration 4562 attribStat(l.head, env); 4563 // Check that declarations in inner classes are not static (JLS 8.1.2) 4564 // Make an exception for static constants. 4565 if (c.owner.kind != PCK && 4566 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4567 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4568 Symbol sym = null; 4569 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4570 if (sym == null || 4571 sym.kind != VAR || 4572 ((VarSymbol) sym).getConstValue() == null) 4573 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4574 } 4575 } 4576 4577 // Check for cycles among non-initial constructors. 4578 chk.checkCyclicConstructors(tree); 4579 4580 // Check for cycles among annotation elements. 4581 chk.checkNonCyclicElements(tree); 4582 4583 // Check for proper use of serialVersionUID 4584 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4585 && isSerializable(c.type) 4586 && (c.flags() & Flags.ENUM) == 0 4587 && !c.isAnonymous() 4588 && checkForSerial(c)) { 4589 checkSerialVersionUID(tree, c); 4590 } 4591 if (allowTypeAnnos) { 4592 // Correctly organize the postions of the type annotations 4593 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4594 4595 // Check type annotations applicability rules 4596 validateTypeAnnotations(tree, false); 4597 } 4598 } 4599 // where 4600 boolean checkForSerial(ClassSymbol c) { 4601 if ((c.flags() & ABSTRACT) == 0) { 4602 return true; 4603 } else { 4604 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4605 } 4606 } 4607 4608 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = s -> 4609 s.kind == MTH && (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4610 4611 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4612 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4613 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4614 if (types.isSameType(al.head.annotationType.type, t)) 4615 return al.head.pos(); 4616 } 4617 4618 return null; 4619 } 4620 4621 /** check if a type is a subtype of Serializable, if that is available. */ 4622 boolean isSerializable(Type t) { 4623 try { 4624 syms.serializableType.complete(); 4625 } 4626 catch (CompletionFailure e) { 4627 return false; 4628 } 4629 return types.isSubtype(t, syms.serializableType); 4630 } 4631 4632 /** Check that an appropriate serialVersionUID member is defined. */ 4633 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4634 4635 // check for presence of serialVersionUID 4636 VarSymbol svuid = null; 4637 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4638 if (sym.kind == VAR) { 4639 svuid = (VarSymbol)sym; 4640 break; 4641 } 4642 } 4643 4644 if (svuid == null) { 4645 log.warning(LintCategory.SERIAL, 4646 tree.pos(), "missing.SVUID", c); 4647 return; 4648 } 4649 4650 // check that it is static final 4651 if ((svuid.flags() & (STATIC | FINAL)) != 4652 (STATIC | FINAL)) 4653 log.warning(LintCategory.SERIAL, 4654 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4655 4656 // check that it is long 4657 else if (!svuid.type.hasTag(LONG)) 4658 log.warning(LintCategory.SERIAL, 4659 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4660 4661 // check constant 4662 else if (svuid.getConstValue() == null) 4663 log.warning(LintCategory.SERIAL, 4664 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4665 } 4666 4667 private Type capture(Type type) { 4668 return types.capture(type); 4669 } 4670 4671 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4672 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4673 } 4674 //where 4675 private final class TypeAnnotationsValidator extends TreeScanner { 4676 4677 private final boolean sigOnly; 4678 public TypeAnnotationsValidator(boolean sigOnly) { 4679 this.sigOnly = sigOnly; 4680 } 4681 4682 public void visitAnnotation(JCAnnotation tree) { 4683 chk.validateTypeAnnotation(tree, false); 4684 super.visitAnnotation(tree); 4685 } 4686 public void visitAnnotatedType(JCAnnotatedType tree) { 4687 if (!tree.underlyingType.type.isErroneous()) { 4688 super.visitAnnotatedType(tree); 4689 } 4690 } 4691 public void visitTypeParameter(JCTypeParameter tree) { 4692 chk.validateTypeAnnotations(tree.annotations, true); 4693 scan(tree.bounds); 4694 // Don't call super. 4695 // This is needed because above we call validateTypeAnnotation with 4696 // false, which would forbid annotations on type parameters. 4697 // super.visitTypeParameter(tree); 4698 } 4699 public void visitMethodDef(JCMethodDecl tree) { 4700 if (tree.recvparam != null && 4701 !tree.recvparam.vartype.type.isErroneous()) { 4702 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4703 tree.recvparam.vartype.type.tsym); 4704 } 4705 if (tree.restype != null && tree.restype.type != null) { 4706 validateAnnotatedType(tree.restype, tree.restype.type); 4707 } 4708 if (sigOnly) { 4709 scan(tree.mods); 4710 scan(tree.restype); 4711 scan(tree.typarams); 4712 scan(tree.recvparam); 4713 scan(tree.params); 4714 scan(tree.thrown); 4715 } else { 4716 scan(tree.defaultValue); 4717 scan(tree.body); 4718 } 4719 } 4720 public void visitVarDef(final JCVariableDecl tree) { 4721 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4722 if (tree.sym != null && tree.sym.type != null) 4723 validateAnnotatedType(tree.vartype, tree.sym.type); 4724 scan(tree.mods); 4725 scan(tree.vartype); 4726 if (!sigOnly) { 4727 scan(tree.init); 4728 } 4729 } 4730 public void visitTypeCast(JCTypeCast tree) { 4731 if (tree.clazz != null && tree.clazz.type != null) 4732 validateAnnotatedType(tree.clazz, tree.clazz.type); 4733 super.visitTypeCast(tree); 4734 } 4735 public void visitTypeTest(JCInstanceOf tree) { 4736 if (tree.clazz != null && tree.clazz.type != null) 4737 validateAnnotatedType(tree.clazz, tree.clazz.type); 4738 super.visitTypeTest(tree); 4739 } 4740 public void visitNewClass(JCNewClass tree) { 4741 if (tree.clazz != null && tree.clazz.type != null) { 4742 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4743 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4744 tree.clazz.type.tsym); 4745 } 4746 if (tree.def != null) { 4747 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4748 } 4749 4750 validateAnnotatedType(tree.clazz, tree.clazz.type); 4751 } 4752 super.visitNewClass(tree); 4753 } 4754 public void visitNewArray(JCNewArray tree) { 4755 if (tree.elemtype != null && tree.elemtype.type != null) { 4756 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4757 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4758 tree.elemtype.type.tsym); 4759 } 4760 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4761 } 4762 super.visitNewArray(tree); 4763 } 4764 public void visitClassDef(JCClassDecl tree) { 4765 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4766 if (sigOnly) { 4767 scan(tree.mods); 4768 scan(tree.typarams); 4769 scan(tree.extending); 4770 scan(tree.implementing); 4771 } 4772 for (JCTree member : tree.defs) { 4773 if (member.hasTag(Tag.CLASSDEF)) { 4774 continue; 4775 } 4776 scan(member); 4777 } 4778 } 4779 public void visitBlock(JCBlock tree) { 4780 if (!sigOnly) { 4781 scan(tree.stats); 4782 } 4783 } 4784 4785 /* I would want to model this after 4786 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4787 * and override visitSelect and visitTypeApply. 4788 * However, we only set the annotated type in the top-level type 4789 * of the symbol. 4790 * Therefore, we need to override each individual location where a type 4791 * can occur. 4792 */ 4793 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4794 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4795 4796 if (type.isPrimitiveOrVoid()) { 4797 return; 4798 } 4799 4800 JCTree enclTr = errtree; 4801 Type enclTy = type; 4802 4803 boolean repeat = true; 4804 while (repeat) { 4805 if (enclTr.hasTag(TYPEAPPLY)) { 4806 List<Type> tyargs = enclTy.getTypeArguments(); 4807 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4808 if (trargs.length() > 0) { 4809 // Nothing to do for diamonds 4810 if (tyargs.length() == trargs.length()) { 4811 for (int i = 0; i < tyargs.length(); ++i) { 4812 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4813 } 4814 } 4815 // If the lengths don't match, it's either a diamond 4816 // or some nested type that redundantly provides 4817 // type arguments in the tree. 4818 } 4819 4820 // Look at the clazz part of a generic type 4821 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4822 } 4823 4824 if (enclTr.hasTag(SELECT)) { 4825 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4826 if (enclTy != null && 4827 !enclTy.hasTag(NONE)) { 4828 enclTy = enclTy.getEnclosingType(); 4829 } 4830 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4831 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4832 if (enclTy == null || enclTy.hasTag(NONE)) { 4833 if (at.getAnnotations().size() == 1) { 4834 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4835 } else { 4836 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4837 for (JCAnnotation an : at.getAnnotations()) { 4838 comps.add(an.attribute); 4839 } 4840 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4841 } 4842 repeat = false; 4843 } 4844 enclTr = at.underlyingType; 4845 // enclTy doesn't need to be changed 4846 } else if (enclTr.hasTag(IDENT)) { 4847 repeat = false; 4848 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4849 JCWildcard wc = (JCWildcard) enclTr; 4850 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4851 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4852 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4853 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4854 } else { 4855 // Nothing to do for UNBOUND 4856 } 4857 repeat = false; 4858 } else if (enclTr.hasTag(TYPEARRAY)) { 4859 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4860 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4861 repeat = false; 4862 } else if (enclTr.hasTag(TYPEUNION)) { 4863 JCTypeUnion ut = (JCTypeUnion) enclTr; 4864 for (JCTree t : ut.getTypeAlternatives()) { 4865 validateAnnotatedType(t, t.type); 4866 } 4867 repeat = false; 4868 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4869 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4870 for (JCTree t : it.getBounds()) { 4871 validateAnnotatedType(t, t.type); 4872 } 4873 repeat = false; 4874 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4875 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4876 repeat = false; 4877 } else { 4878 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4879 " within: "+ errtree + " with kind: " + errtree.getKind()); 4880 } 4881 } 4882 } 4883 4884 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4885 Symbol sym) { 4886 // Ensure that no declaration annotations are present. 4887 // Note that a tree type might be an AnnotatedType with 4888 // empty annotations, if only declaration annotations were given. 4889 // This method will raise an error for such a type. 4890 for (JCAnnotation ai : annotations) { 4891 if (!ai.type.isErroneous() && 4892 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4893 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4894 } 4895 } 4896 } 4897 } 4898 4899 // <editor-fold desc="post-attribution visitor"> 4900 4901 /** 4902 * Handle missing types/symbols in an AST. This routine is useful when 4903 * the compiler has encountered some errors (which might have ended up 4904 * terminating attribution abruptly); if the compiler is used in fail-over 4905 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4906 * prevents NPE to be progagated during subsequent compilation steps. 4907 */ 4908 public void postAttr(JCTree tree) { 4909 new PostAttrAnalyzer().scan(tree); 4910 } 4911 4912 class PostAttrAnalyzer extends TreeScanner { 4913 4914 private void initTypeIfNeeded(JCTree that) { 4915 if (that.type == null) { 4916 if (that.hasTag(METHODDEF)) { 4917 that.type = dummyMethodType((JCMethodDecl)that); 4918 } else { 4919 that.type = syms.unknownType; 4920 } 4921 } 4922 } 4923 4924 /* Construct a dummy method type. If we have a method declaration, 4925 * and the declared return type is void, then use that return type 4926 * instead of UNKNOWN to avoid spurious error messages in lambda 4927 * bodies (see:JDK-8041704). 4928 */ 4929 private Type dummyMethodType(JCMethodDecl md) { 4930 Type restype = syms.unknownType; 4931 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4932 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4933 if (prim.typetag == VOID) 4934 restype = syms.voidType; 4935 } 4936 return new MethodType(List.nil(), restype, 4937 List.nil(), syms.methodClass); 4938 } 4939 private Type dummyMethodType() { 4940 return dummyMethodType(null); 4941 } 4942 4943 @Override 4944 public void scan(JCTree tree) { 4945 if (tree == null) return; 4946 if (tree instanceof JCExpression) { 4947 initTypeIfNeeded(tree); 4948 } 4949 super.scan(tree); 4950 } 4951 4952 @Override 4953 public void visitIdent(JCIdent that) { 4954 if (that.sym == null) { 4955 that.sym = syms.unknownSymbol; 4956 } 4957 } 4958 4959 @Override 4960 public void visitSelect(JCFieldAccess that) { 4961 if (that.sym == null) { 4962 that.sym = syms.unknownSymbol; 4963 } 4964 super.visitSelect(that); 4965 } 4966 4967 @Override 4968 public void visitClassDef(JCClassDecl that) { 4969 initTypeIfNeeded(that); 4970 if (that.sym == null) { 4971 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4972 } 4973 super.visitClassDef(that); 4974 } 4975 4976 @Override 4977 public void visitMethodDef(JCMethodDecl that) { 4978 initTypeIfNeeded(that); 4979 if (that.sym == null) { 4980 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4981 } 4982 super.visitMethodDef(that); 4983 } 4984 4985 @Override 4986 public void visitVarDef(JCVariableDecl that) { 4987 initTypeIfNeeded(that); 4988 if (that.sym == null) { 4989 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4990 that.sym.adr = 0; 4991 } 4992 if (that.vartype == null) { 4993 that.vartype = make.Erroneous(); 4994 } 4995 super.visitVarDef(that); 4996 } 4997 4998 @Override 4999 public void visitNewClass(JCNewClass that) { 5000 if (that.constructor == null) { 5001 that.constructor = new MethodSymbol(0, names.init, 5002 dummyMethodType(), syms.noSymbol); 5003 } 5004 if (that.constructorType == null) { 5005 that.constructorType = syms.unknownType; 5006 } 5007 super.visitNewClass(that); 5008 } 5009 5010 @Override 5011 public void visitAssignop(JCAssignOp that) { 5012 if (that.operator == null) { 5013 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5014 -1, syms.noSymbol); 5015 } 5016 super.visitAssignop(that); 5017 } 5018 5019 @Override 5020 public void visitBinary(JCBinary that) { 5021 if (that.operator == null) { 5022 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5023 -1, syms.noSymbol); 5024 } 5025 super.visitBinary(that); 5026 } 5027 5028 @Override 5029 public void visitUnary(JCUnary that) { 5030 if (that.operator == null) { 5031 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5032 -1, syms.noSymbol); 5033 } 5034 super.visitUnary(that); 5035 } 5036 5037 @Override 5038 public void visitLambda(JCLambda that) { 5039 super.visitLambda(that); 5040 if (that.targets == null) { 5041 that.targets = List.nil(); 5042 } 5043 } 5044 5045 @Override 5046 public void visitReference(JCMemberReference that) { 5047 super.visitReference(that); 5048 if (that.sym == null) { 5049 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 5050 syms.noSymbol); 5051 } 5052 if (that.targets == null) { 5053 that.targets = List.nil(); 5054 } 5055 } 5056 } 5057 // </editor-fold> 5058 5059 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 5060 new TreeScanner() { 5061 Symbol packge = pkg; 5062 @Override 5063 public void visitIdent(JCIdent that) { 5064 that.sym = packge; 5065 } 5066 5067 @Override 5068 public void visitSelect(JCFieldAccess that) { 5069 that.sym = packge; 5070 packge = packge.owner; 5071 super.visitSelect(that); 5072 } 5073 }.scan(pid); 5074 } 5075 5076} 5077