Attr.java revision 4046:6b51827c339c
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 NO_TREE_UPDATE { // Mode signalling 'fake check' - skip tree update 452 @Override 453 public boolean updateTreeType() { 454 return false; 455 } 456 }, 457 NO_INFERENCE_HOOK { // Mode signalling that caller will manage free types in tree decorations. 458 @Override 459 public boolean installPostInferenceHook() { 460 return false; 461 } 462 }; 463 464 public boolean updateTreeType() { 465 return true; 466 } 467 public boolean installPostInferenceHook() { 468 return true; 469 } 470 } 471 472 473 class ResultInfo { 474 final KindSelector pkind; 475 final Type pt; 476 final CheckContext checkContext; 477 final CheckMode checkMode; 478 479 ResultInfo(KindSelector pkind, Type pt) { 480 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 481 } 482 483 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 484 this(pkind, pt, chk.basicHandler, checkMode); 485 } 486 487 protected ResultInfo(KindSelector pkind, 488 Type pt, CheckContext checkContext) { 489 this(pkind, pt, checkContext, CheckMode.NORMAL); 490 } 491 492 protected ResultInfo(KindSelector pkind, 493 Type pt, CheckContext checkContext, CheckMode checkMode) { 494 this.pkind = pkind; 495 this.pt = pt; 496 this.checkContext = checkContext; 497 this.checkMode = checkMode; 498 } 499 500 protected void attr(JCTree tree, Env<AttrContext> env) { 501 tree.accept(Attr.this); 502 } 503 504 protected Type check(final DiagnosticPosition pos, final Type found) { 505 return chk.checkType(pos, found, pt, checkContext); 506 } 507 508 protected ResultInfo dup(Type newPt) { 509 return new ResultInfo(pkind, newPt, checkContext, checkMode); 510 } 511 512 protected ResultInfo dup(CheckContext newContext) { 513 return new ResultInfo(pkind, pt, newContext, checkMode); 514 } 515 516 protected ResultInfo dup(Type newPt, CheckContext newContext) { 517 return new ResultInfo(pkind, newPt, newContext, checkMode); 518 } 519 520 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 521 return new ResultInfo(pkind, newPt, newContext, newMode); 522 } 523 524 protected ResultInfo dup(CheckMode newMode) { 525 return new ResultInfo(pkind, pt, checkContext, newMode); 526 } 527 528 @Override 529 public String toString() { 530 if (pt != null) { 531 return pt.toString(); 532 } else { 533 return ""; 534 } 535 } 536 } 537 538 class MethodAttrInfo extends ResultInfo { 539 public MethodAttrInfo() { 540 this(chk.basicHandler); 541 } 542 543 public MethodAttrInfo(CheckContext checkContext) { 544 super(KindSelector.VAL, Infer.anyPoly, checkContext); 545 } 546 547 @Override 548 protected void attr(JCTree tree, Env<AttrContext> env) { 549 result = argumentAttr.attribArg(tree, env); 550 } 551 552 protected ResultInfo dup(Type newPt) { 553 throw new IllegalStateException(); 554 } 555 556 protected ResultInfo dup(CheckContext newContext) { 557 return new MethodAttrInfo(newContext); 558 } 559 560 protected ResultInfo dup(Type newPt, CheckContext newContext) { 561 throw new IllegalStateException(); 562 } 563 564 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 565 throw new IllegalStateException(); 566 } 567 568 protected ResultInfo dup(CheckMode newMode) { 569 throw new IllegalStateException(); 570 } 571 } 572 573 class RecoveryInfo extends ResultInfo { 574 575 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 576 super(KindSelector.VAL, Type.recoveryType, 577 new Check.NestedCheckContext(chk.basicHandler) { 578 @Override 579 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 580 return deferredAttrContext; 581 } 582 @Override 583 public boolean compatible(Type found, Type req, Warner warn) { 584 return true; 585 } 586 @Override 587 public void report(DiagnosticPosition pos, JCDiagnostic details) { 588 chk.basicHandler.report(pos, details); 589 } 590 }); 591 } 592 } 593 594 final ResultInfo statInfo; 595 final ResultInfo varAssignmentInfo; 596 final ResultInfo methodAttrInfo; 597 final ResultInfo unknownExprInfo; 598 final ResultInfo unknownTypeInfo; 599 final ResultInfo unknownTypeExprInfo; 600 final ResultInfo recoveryInfo; 601 602 Type pt() { 603 return resultInfo.pt; 604 } 605 606 KindSelector pkind() { 607 return resultInfo.pkind; 608 } 609 610/* ************************************************************************ 611 * Visitor methods 612 *************************************************************************/ 613 614 /** Visitor argument: the current environment. 615 */ 616 Env<AttrContext> env; 617 618 /** Visitor argument: the currently expected attribution result. 619 */ 620 ResultInfo resultInfo; 621 622 /** Visitor result: the computed type. 623 */ 624 Type result; 625 626 /** Visitor method: attribute a tree, catching any completion failure 627 * exceptions. Return the tree's type. 628 * 629 * @param tree The tree to be visited. 630 * @param env The environment visitor argument. 631 * @param resultInfo The result info visitor argument. 632 */ 633 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 634 Env<AttrContext> prevEnv = this.env; 635 ResultInfo prevResult = this.resultInfo; 636 try { 637 this.env = env; 638 this.resultInfo = resultInfo; 639 resultInfo.attr(tree, env); 640 if (tree == breakTree && 641 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 642 throw new BreakAttr(copyEnv(env)); 643 } 644 return result; 645 } catch (CompletionFailure ex) { 646 tree.type = syms.errType; 647 return chk.completionError(tree.pos(), ex); 648 } finally { 649 this.env = prevEnv; 650 this.resultInfo = prevResult; 651 } 652 } 653 654 Env<AttrContext> copyEnv(Env<AttrContext> env) { 655 Env<AttrContext> newEnv = 656 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 657 if (newEnv.outer != null) { 658 newEnv.outer = copyEnv(newEnv.outer); 659 } 660 return newEnv; 661 } 662 663 WriteableScope copyScope(WriteableScope sc) { 664 WriteableScope newScope = WriteableScope.create(sc.owner); 665 List<Symbol> elemsList = List.nil(); 666 for (Symbol sym : sc.getSymbols()) { 667 elemsList = elemsList.prepend(sym); 668 } 669 for (Symbol s : elemsList) { 670 newScope.enter(s); 671 } 672 return newScope; 673 } 674 675 /** Derived visitor method: attribute an expression tree. 676 */ 677 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 678 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 679 } 680 681 /** Derived visitor method: attribute an expression tree with 682 * no constraints on the computed type. 683 */ 684 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 685 return attribTree(tree, env, unknownExprInfo); 686 } 687 688 /** Derived visitor method: attribute a type tree. 689 */ 690 public Type attribType(JCTree tree, Env<AttrContext> env) { 691 Type result = attribType(tree, env, Type.noType); 692 return result; 693 } 694 695 /** Derived visitor method: attribute a type tree. 696 */ 697 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 698 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 699 return result; 700 } 701 702 /** Derived visitor method: attribute a statement or definition tree. 703 */ 704 public Type attribStat(JCTree tree, Env<AttrContext> env) { 705 Env<AttrContext> analyzeEnv = 706 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 707 try { 708 return attribTree(tree, env, statInfo); 709 } finally { 710 analyzer.analyzeIfNeeded(tree, analyzeEnv); 711 } 712 } 713 714 /** Attribute a list of expressions, returning a list of types. 715 */ 716 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 717 ListBuffer<Type> ts = new ListBuffer<>(); 718 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 719 ts.append(attribExpr(l.head, env, pt)); 720 return ts.toList(); 721 } 722 723 /** Attribute a list of statements, returning nothing. 724 */ 725 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 726 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 727 attribStat(l.head, env); 728 } 729 730 /** Attribute the arguments in a method call, returning the method kind. 731 */ 732 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 733 KindSelector kind = initialKind; 734 for (JCExpression arg : trees) { 735 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 736 if (argtype.hasTag(DEFERRED)) { 737 kind = KindSelector.of(KindSelector.POLY, kind); 738 } 739 argtypes.append(argtype); 740 } 741 return kind; 742 } 743 744 /** Attribute a type argument list, returning a list of types. 745 * Caller is responsible for calling checkRefTypes. 746 */ 747 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 748 ListBuffer<Type> argtypes = new ListBuffer<>(); 749 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 750 argtypes.append(attribType(l.head, env)); 751 return argtypes.toList(); 752 } 753 754 /** Attribute a type argument list, returning a list of types. 755 * Check that all the types are references. 756 */ 757 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 758 List<Type> types = attribAnyTypes(trees, env); 759 return chk.checkRefTypes(trees, types); 760 } 761 762 /** 763 * Attribute type variables (of generic classes or methods). 764 * Compound types are attributed later in attribBounds. 765 * @param typarams the type variables to enter 766 * @param env the current environment 767 */ 768 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 769 for (JCTypeParameter tvar : typarams) { 770 TypeVar a = (TypeVar)tvar.type; 771 a.tsym.flags_field |= UNATTRIBUTED; 772 a.bound = Type.noType; 773 if (!tvar.bounds.isEmpty()) { 774 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 775 for (JCExpression bound : tvar.bounds.tail) 776 bounds = bounds.prepend(attribType(bound, env)); 777 types.setBounds(a, bounds.reverse()); 778 } else { 779 // if no bounds are given, assume a single bound of 780 // java.lang.Object. 781 types.setBounds(a, List.of(syms.objectType)); 782 } 783 a.tsym.flags_field &= ~UNATTRIBUTED; 784 } 785 for (JCTypeParameter tvar : typarams) { 786 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 787 } 788 } 789 790 /** 791 * Attribute the type references in a list of annotations. 792 */ 793 void attribAnnotationTypes(List<JCAnnotation> annotations, 794 Env<AttrContext> env) { 795 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 796 JCAnnotation a = al.head; 797 attribType(a.annotationType, env); 798 } 799 } 800 801 /** 802 * Attribute a "lazy constant value". 803 * @param env The env for the const value 804 * @param variable The initializer for the const value 805 * @param type The expected type, or null 806 * @see VarSymbol#setLazyConstValue 807 */ 808 public Object attribLazyConstantValue(Env<AttrContext> env, 809 JCVariableDecl variable, 810 Type type) { 811 812 DiagnosticPosition prevLintPos 813 = deferredLintHandler.setPos(variable.pos()); 814 815 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 816 try { 817 Type itype = attribExpr(variable.init, env, type); 818 if (itype.constValue() != null) { 819 return coerce(itype, type).constValue(); 820 } else { 821 return null; 822 } 823 } finally { 824 log.useSource(prevSource); 825 deferredLintHandler.setPos(prevLintPos); 826 } 827 } 828 829 /** Attribute type reference in an `extends' or `implements' clause. 830 * Supertypes of anonymous inner classes are usually already attributed. 831 * 832 * @param tree The tree making up the type reference. 833 * @param env The environment current at the reference. 834 * @param classExpected true if only a class is expected here. 835 * @param interfaceExpected true if only an interface is expected here. 836 */ 837 Type attribBase(JCTree tree, 838 Env<AttrContext> env, 839 boolean classExpected, 840 boolean interfaceExpected, 841 boolean checkExtensible) { 842 Type t = tree.type != null ? 843 tree.type : 844 attribType(tree, env); 845 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 846 } 847 Type checkBase(Type t, 848 JCTree tree, 849 Env<AttrContext> env, 850 boolean classExpected, 851 boolean interfaceExpected, 852 boolean checkExtensible) { 853 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 854 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 855 if (t.tsym.isAnonymous()) { 856 log.error(pos, "cant.inherit.from.anon"); 857 return types.createErrorType(t); 858 } 859 if (t.isErroneous()) 860 return t; 861 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 862 // check that type variable is already visible 863 if (t.getUpperBound() == null) { 864 log.error(pos, "illegal.forward.ref"); 865 return types.createErrorType(t); 866 } 867 } else { 868 t = chk.checkClassType(pos, t, checkExtensible); 869 } 870 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 871 log.error(pos, "intf.expected.here"); 872 // return errType is necessary since otherwise there might 873 // be undetected cycles which cause attribution to loop 874 return types.createErrorType(t); 875 } else if (checkExtensible && 876 classExpected && 877 (t.tsym.flags() & INTERFACE) != 0) { 878 log.error(pos, "no.intf.expected.here"); 879 return types.createErrorType(t); 880 } 881 if (checkExtensible && 882 ((t.tsym.flags() & FINAL) != 0)) { 883 log.error(pos, 884 "cant.inherit.from.final", t.tsym); 885 } 886 chk.checkNonCyclic(pos, t); 887 return t; 888 } 889 890 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 891 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 892 id.type = env.info.scope.owner.enclClass().type; 893 id.sym = env.info.scope.owner.enclClass(); 894 return id.type; 895 } 896 897 public void visitClassDef(JCClassDecl tree) { 898 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 899 Optional.ofNullable(env.info.isSpeculative ? 900 argumentAttr.withLocalCacheContext() : null); 901 try { 902 // Local and anonymous classes have not been entered yet, so we need to 903 // do it now. 904 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 905 enter.classEnter(tree, env); 906 } else { 907 // If this class declaration is part of a class level annotation, 908 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 909 // order to simplify later steps and allow for sensible error 910 // messages. 911 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 912 enter.classEnter(tree, env); 913 } 914 915 ClassSymbol c = tree.sym; 916 if (c == null) { 917 // exit in case something drastic went wrong during enter. 918 result = null; 919 } else { 920 // make sure class has been completed: 921 c.complete(); 922 923 // If this class appears as an anonymous class 924 // in a superclass constructor call 925 // disable implicit outer instance from being passed. 926 // (This would be an illegal access to "this before super"). 927 if (env.info.isSelfCall && 928 env.tree.hasTag(NEWCLASS)) { 929 c.flags_field |= NOOUTERTHIS; 930 } 931 attribClass(tree.pos(), c); 932 result = tree.type = c.type; 933 } 934 } finally { 935 localCacheContext.ifPresent(LocalCacheContext::leave); 936 } 937 } 938 939 public void visitMethodDef(JCMethodDecl tree) { 940 MethodSymbol m = tree.sym; 941 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 942 943 Lint lint = env.info.lint.augment(m); 944 Lint prevLint = chk.setLint(lint); 945 MethodSymbol prevMethod = chk.setMethod(m); 946 try { 947 deferredLintHandler.flush(tree.pos()); 948 chk.checkDeprecatedAnnotation(tree.pos(), m); 949 950 951 // Create a new environment with local scope 952 // for attributing the method. 953 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 954 localEnv.info.lint = lint; 955 956 attribStats(tree.typarams, localEnv); 957 958 // If we override any other methods, check that we do so properly. 959 // JLS ??? 960 if (m.isStatic()) { 961 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 962 } else { 963 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 964 } 965 chk.checkOverride(env, tree, m); 966 967 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 968 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 969 } 970 971 // Enter all type parameters into the local method scope. 972 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 973 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 974 975 ClassSymbol owner = env.enclClass.sym; 976 if ((owner.flags() & ANNOTATION) != 0 && 977 (tree.params.nonEmpty() || 978 tree.recvparam != null)) 979 log.error(tree.params.nonEmpty() ? 980 tree.params.head.pos() : 981 tree.recvparam.pos(), 982 "intf.annotation.members.cant.have.params"); 983 984 // Attribute all value parameters. 985 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 986 attribStat(l.head, localEnv); 987 } 988 989 chk.checkVarargsMethodDecl(localEnv, tree); 990 991 // Check that type parameters are well-formed. 992 chk.validate(tree.typarams, localEnv); 993 994 // Check that result type is well-formed. 995 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 996 chk.validate(tree.restype, localEnv); 997 998 // Check that receiver type is well-formed. 999 if (tree.recvparam != null) { 1000 // Use a new environment to check the receiver parameter. 1001 // Otherwise I get "might not have been initialized" errors. 1002 // Is there a better way? 1003 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1004 attribType(tree.recvparam, newEnv); 1005 chk.validate(tree.recvparam, newEnv); 1006 } 1007 1008 // annotation method checks 1009 if ((owner.flags() & ANNOTATION) != 0) { 1010 // annotation method cannot have throws clause 1011 if (tree.thrown.nonEmpty()) { 1012 log.error(tree.thrown.head.pos(), 1013 "throws.not.allowed.in.intf.annotation"); 1014 } 1015 // annotation method cannot declare type-parameters 1016 if (tree.typarams.nonEmpty()) { 1017 log.error(tree.typarams.head.pos(), 1018 "intf.annotation.members.cant.have.type.params"); 1019 } 1020 // validate annotation method's return type (could be an annotation type) 1021 chk.validateAnnotationType(tree.restype); 1022 // ensure that annotation method does not clash with members of Object/Annotation 1023 chk.validateAnnotationMethod(tree.pos(), m); 1024 } 1025 1026 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1027 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1028 1029 if (tree.body == null) { 1030 // Empty bodies are only allowed for 1031 // abstract, native, or interface methods, or for methods 1032 // in a retrofit signature class. 1033 if (tree.defaultValue != null) { 1034 if ((owner.flags() & ANNOTATION) == 0) 1035 log.error(tree.pos(), 1036 "default.allowed.in.intf.annotation.member"); 1037 } 1038 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1039 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1040 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1041 if ((owner.flags() & INTERFACE) != 0) { 1042 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1043 } else { 1044 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1045 } 1046 } else if ((tree.mods.flags & NATIVE) != 0) { 1047 log.error(tree.pos(), "native.meth.cant.have.body"); 1048 } else { 1049 // Add an implicit super() call unless an explicit call to 1050 // super(...) or this(...) is given 1051 // or we are compiling class java.lang.Object. 1052 if (tree.name == names.init && owner.type != syms.objectType) { 1053 JCBlock body = tree.body; 1054 if (body.stats.isEmpty() || 1055 !TreeInfo.isSelfCall(body.stats.head)) { 1056 body.stats = body.stats. 1057 prepend(typeEnter.SuperCall(make.at(body.pos), 1058 List.nil(), 1059 List.nil(), 1060 false)); 1061 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1062 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1063 TreeInfo.isSuperCall(body.stats.head)) { 1064 // enum constructors are not allowed to call super 1065 // directly, so make sure there aren't any super calls 1066 // in enum constructors, except in the compiler 1067 // generated one. 1068 log.error(tree.body.stats.head.pos(), 1069 "call.to.super.not.allowed.in.enum.ctor", 1070 env.enclClass.sym); 1071 } 1072 } 1073 1074 // Attribute all type annotations in the body 1075 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1076 annotate.flush(); 1077 1078 // Attribute method body. 1079 attribStat(tree.body, localEnv); 1080 } 1081 1082 localEnv.info.scope.leave(); 1083 result = tree.type = m.type; 1084 } finally { 1085 chk.setLint(prevLint); 1086 chk.setMethod(prevMethod); 1087 } 1088 } 1089 1090 public void visitVarDef(JCVariableDecl tree) { 1091 // Local variables have not been entered yet, so we need to do it now: 1092 if (env.info.scope.owner.kind == MTH) { 1093 if (tree.sym != null) { 1094 // parameters have already been entered 1095 env.info.scope.enter(tree.sym); 1096 } else { 1097 try { 1098 annotate.blockAnnotations(); 1099 memberEnter.memberEnter(tree, env); 1100 } finally { 1101 annotate.unblockAnnotations(); 1102 } 1103 } 1104 } else { 1105 if (tree.init != null) { 1106 // Field initializer expression need to be entered. 1107 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1108 annotate.flush(); 1109 } 1110 } 1111 1112 VarSymbol v = tree.sym; 1113 Lint lint = env.info.lint.augment(v); 1114 Lint prevLint = chk.setLint(lint); 1115 1116 // Check that the variable's declared type is well-formed. 1117 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1118 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1119 (tree.sym.flags() & PARAMETER) != 0; 1120 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1121 1122 try { 1123 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1124 deferredLintHandler.flush(tree.pos()); 1125 chk.checkDeprecatedAnnotation(tree.pos(), v); 1126 1127 if (tree.init != null) { 1128 if ((v.flags_field & FINAL) == 0 || 1129 !memberEnter.needsLazyConstValue(tree.init)) { 1130 // Not a compile-time constant 1131 // Attribute initializer in a new environment 1132 // with the declared variable as owner. 1133 // Check that initializer conforms to variable's declared type. 1134 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1135 initEnv.info.lint = lint; 1136 // In order to catch self-references, we set the variable's 1137 // declaration position to maximal possible value, effectively 1138 // marking the variable as undefined. 1139 initEnv.info.enclVar = v; 1140 attribExpr(tree.init, initEnv, v.type); 1141 } 1142 } 1143 result = tree.type = v.type; 1144 } 1145 finally { 1146 chk.setLint(prevLint); 1147 } 1148 } 1149 1150 public void visitSkip(JCSkip tree) { 1151 result = null; 1152 } 1153 1154 public void visitBlock(JCBlock tree) { 1155 if (env.info.scope.owner.kind == TYP) { 1156 // Block is a static or instance initializer; 1157 // let the owner of the environment be a freshly 1158 // created BLOCK-method. 1159 Symbol fakeOwner = 1160 new MethodSymbol(tree.flags | BLOCK | 1161 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1162 env.info.scope.owner); 1163 final Env<AttrContext> localEnv = 1164 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1165 1166 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1167 // Attribute all type annotations in the block 1168 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1169 annotate.flush(); 1170 attribStats(tree.stats, localEnv); 1171 1172 { 1173 // Store init and clinit type annotations with the ClassSymbol 1174 // to allow output in Gen.normalizeDefs. 1175 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1176 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1177 if ((tree.flags & STATIC) != 0) { 1178 cs.appendClassInitTypeAttributes(tas); 1179 } else { 1180 cs.appendInitTypeAttributes(tas); 1181 } 1182 } 1183 } else { 1184 // Create a new local environment with a local scope. 1185 Env<AttrContext> localEnv = 1186 env.dup(tree, env.info.dup(env.info.scope.dup())); 1187 try { 1188 attribStats(tree.stats, localEnv); 1189 } finally { 1190 localEnv.info.scope.leave(); 1191 } 1192 } 1193 result = null; 1194 } 1195 1196 public void visitDoLoop(JCDoWhileLoop tree) { 1197 attribStat(tree.body, env.dup(tree)); 1198 attribExpr(tree.cond, env, syms.booleanType); 1199 result = null; 1200 } 1201 1202 public void visitWhileLoop(JCWhileLoop tree) { 1203 attribExpr(tree.cond, env, syms.booleanType); 1204 attribStat(tree.body, env.dup(tree)); 1205 result = null; 1206 } 1207 1208 public void visitForLoop(JCForLoop tree) { 1209 Env<AttrContext> loopEnv = 1210 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1211 try { 1212 attribStats(tree.init, loopEnv); 1213 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1214 loopEnv.tree = tree; // before, we were not in loop! 1215 attribStats(tree.step, loopEnv); 1216 attribStat(tree.body, loopEnv); 1217 result = null; 1218 } 1219 finally { 1220 loopEnv.info.scope.leave(); 1221 } 1222 } 1223 1224 public void visitForeachLoop(JCEnhancedForLoop tree) { 1225 Env<AttrContext> loopEnv = 1226 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1227 try { 1228 //the Formal Parameter of a for-each loop is not in the scope when 1229 //attributing the for-each expression; we mimick this by attributing 1230 //the for-each expression first (against original scope). 1231 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1232 attribStat(tree.var, loopEnv); 1233 chk.checkNonVoid(tree.pos(), exprType); 1234 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1235 if (elemtype == null) { 1236 // or perhaps expr implements Iterable<T>? 1237 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1238 if (base == null) { 1239 log.error(tree.expr.pos(), 1240 "foreach.not.applicable.to.type", 1241 exprType, 1242 diags.fragment("type.req.array.or.iterable")); 1243 elemtype = types.createErrorType(exprType); 1244 } else { 1245 List<Type> iterableParams = base.allparams(); 1246 elemtype = iterableParams.isEmpty() 1247 ? syms.objectType 1248 : types.wildUpperBound(iterableParams.head); 1249 } 1250 } 1251 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1252 loopEnv.tree = tree; // before, we were not in loop! 1253 attribStat(tree.body, loopEnv); 1254 result = null; 1255 } 1256 finally { 1257 loopEnv.info.scope.leave(); 1258 } 1259 } 1260 1261 public void visitLabelled(JCLabeledStatement tree) { 1262 // Check that label is not used in an enclosing statement 1263 Env<AttrContext> env1 = env; 1264 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1265 if (env1.tree.hasTag(LABELLED) && 1266 ((JCLabeledStatement) env1.tree).label == tree.label) { 1267 log.error(tree.pos(), "label.already.in.use", 1268 tree.label); 1269 break; 1270 } 1271 env1 = env1.next; 1272 } 1273 1274 attribStat(tree.body, env.dup(tree)); 1275 result = null; 1276 } 1277 1278 public void visitSwitch(JCSwitch tree) { 1279 Type seltype = attribExpr(tree.selector, env); 1280 1281 Env<AttrContext> switchEnv = 1282 env.dup(tree, env.info.dup(env.info.scope.dup())); 1283 1284 try { 1285 1286 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1287 boolean stringSwitch = types.isSameType(seltype, syms.stringType); 1288 if (stringSwitch && !allowStringsInSwitch) { 1289 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1290 } 1291 if (!enumSwitch && !stringSwitch) 1292 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1293 1294 // Attribute all cases and 1295 // check that there are no duplicate case labels or default clauses. 1296 Set<Object> labels = new HashSet<>(); // The set of case labels. 1297 boolean hasDefault = false; // Is there a default label? 1298 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1299 JCCase c = l.head; 1300 if (c.pat != null) { 1301 if (enumSwitch) { 1302 Symbol sym = enumConstant(c.pat, seltype); 1303 if (sym == null) { 1304 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1305 } else if (!labels.add(sym)) { 1306 log.error(c.pos(), "duplicate.case.label"); 1307 } 1308 } else { 1309 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1310 if (!pattype.hasTag(ERROR)) { 1311 if (pattype.constValue() == null) { 1312 log.error(c.pat.pos(), 1313 (stringSwitch ? "string.const.req" : "const.expr.req")); 1314 } else if (!labels.add(pattype.constValue())) { 1315 log.error(c.pos(), "duplicate.case.label"); 1316 } 1317 } 1318 } 1319 } else if (hasDefault) { 1320 log.error(c.pos(), "duplicate.default.label"); 1321 } else { 1322 hasDefault = true; 1323 } 1324 Env<AttrContext> caseEnv = 1325 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1326 try { 1327 attribStats(c.stats, caseEnv); 1328 } finally { 1329 caseEnv.info.scope.leave(); 1330 addVars(c.stats, switchEnv.info.scope); 1331 } 1332 } 1333 1334 result = null; 1335 } 1336 finally { 1337 switchEnv.info.scope.leave(); 1338 } 1339 } 1340 // where 1341 /** Add any variables defined in stats to the switch scope. */ 1342 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1343 for (;stats.nonEmpty(); stats = stats.tail) { 1344 JCTree stat = stats.head; 1345 if (stat.hasTag(VARDEF)) 1346 switchScope.enter(((JCVariableDecl) stat).sym); 1347 } 1348 } 1349 // where 1350 /** Return the selected enumeration constant symbol, or null. */ 1351 private Symbol enumConstant(JCTree tree, Type enumType) { 1352 if (tree.hasTag(IDENT)) { 1353 JCIdent ident = (JCIdent)tree; 1354 Name name = ident.name; 1355 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1356 if (sym.kind == VAR) { 1357 Symbol s = ident.sym = sym; 1358 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1359 ident.type = s.type; 1360 return ((s.flags_field & Flags.ENUM) == 0) 1361 ? null : s; 1362 } 1363 } 1364 } 1365 return null; 1366 } 1367 1368 public void visitSynchronized(JCSynchronized tree) { 1369 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1370 attribStat(tree.body, env); 1371 result = null; 1372 } 1373 1374 public void visitTry(JCTry tree) { 1375 // Create a new local environment with a local 1376 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1377 try { 1378 boolean isTryWithResource = tree.resources.nonEmpty(); 1379 // Create a nested environment for attributing the try block if needed 1380 Env<AttrContext> tryEnv = isTryWithResource ? 1381 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1382 localEnv; 1383 try { 1384 // Attribute resource declarations 1385 for (JCTree resource : tree.resources) { 1386 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1387 @Override 1388 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1389 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1390 } 1391 }; 1392 ResultInfo twrResult = 1393 new ResultInfo(KindSelector.VAR, 1394 syms.autoCloseableType, 1395 twrContext); 1396 if (resource.hasTag(VARDEF)) { 1397 attribStat(resource, tryEnv); 1398 twrResult.check(resource, resource.type); 1399 1400 //check that resource type cannot throw InterruptedException 1401 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1402 1403 VarSymbol var = ((JCVariableDecl) resource).sym; 1404 var.setData(ElementKind.RESOURCE_VARIABLE); 1405 } else { 1406 attribTree(resource, tryEnv, twrResult); 1407 } 1408 } 1409 // Attribute body 1410 attribStat(tree.body, tryEnv); 1411 } finally { 1412 if (isTryWithResource) 1413 tryEnv.info.scope.leave(); 1414 } 1415 1416 // Attribute catch clauses 1417 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1418 JCCatch c = l.head; 1419 Env<AttrContext> catchEnv = 1420 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1421 try { 1422 Type ctype = attribStat(c.param, catchEnv); 1423 if (TreeInfo.isMultiCatch(c)) { 1424 //multi-catch parameter is implicitly marked as final 1425 c.param.sym.flags_field |= FINAL | UNION; 1426 } 1427 if (c.param.sym.kind == VAR) { 1428 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1429 } 1430 chk.checkType(c.param.vartype.pos(), 1431 chk.checkClassType(c.param.vartype.pos(), ctype), 1432 syms.throwableType); 1433 attribStat(c.body, catchEnv); 1434 } finally { 1435 catchEnv.info.scope.leave(); 1436 } 1437 } 1438 1439 // Attribute finalizer 1440 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1441 result = null; 1442 } 1443 finally { 1444 localEnv.info.scope.leave(); 1445 } 1446 } 1447 1448 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1449 if (!resource.isErroneous() && 1450 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1451 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1452 Symbol close = syms.noSymbol; 1453 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1454 try { 1455 close = rs.resolveQualifiedMethod(pos, 1456 env, 1457 types.skipTypeVars(resource, false), 1458 names.close, 1459 List.nil(), 1460 List.nil()); 1461 } 1462 finally { 1463 log.popDiagnosticHandler(discardHandler); 1464 } 1465 if (close.kind == MTH && 1466 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1467 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1468 env.info.lint.isEnabled(LintCategory.TRY)) { 1469 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1470 } 1471 } 1472 } 1473 1474 public void visitConditional(JCConditional tree) { 1475 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1476 1477 tree.polyKind = (!allowPoly || 1478 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1479 isBooleanOrNumeric(env, tree)) ? 1480 PolyKind.STANDALONE : PolyKind.POLY; 1481 1482 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1483 //this means we are returning a poly conditional from void-compatible lambda expression 1484 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1485 result = tree.type = types.createErrorType(resultInfo.pt); 1486 return; 1487 } 1488 1489 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1490 unknownExprInfo : 1491 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1492 1493 Type truetype = attribTree(tree.truepart, env, condInfo); 1494 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1495 1496 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1497 if (condtype.constValue() != null && 1498 truetype.constValue() != null && 1499 falsetype.constValue() != null && 1500 !owntype.hasTag(NONE)) { 1501 //constant folding 1502 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1503 } 1504 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1505 } 1506 //where 1507 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1508 switch (tree.getTag()) { 1509 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1510 ((JCLiteral)tree).typetag == BOOLEAN || 1511 ((JCLiteral)tree).typetag == BOT; 1512 case LAMBDA: case REFERENCE: return false; 1513 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1514 case CONDEXPR: 1515 JCConditional condTree = (JCConditional)tree; 1516 return isBooleanOrNumeric(env, condTree.truepart) && 1517 isBooleanOrNumeric(env, condTree.falsepart); 1518 case APPLY: 1519 JCMethodInvocation speculativeMethodTree = 1520 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo); 1521 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1522 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1523 env.enclClass.type : 1524 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1525 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1526 return primitiveOrBoxed(owntype); 1527 case NEWCLASS: 1528 JCExpression className = 1529 removeClassParams.translate(((JCNewClass)tree).clazz); 1530 JCExpression speculativeNewClassTree = 1531 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo); 1532 return primitiveOrBoxed(speculativeNewClassTree.type); 1533 default: 1534 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type; 1535 return primitiveOrBoxed(speculativeType); 1536 } 1537 } 1538 //where 1539 boolean primitiveOrBoxed(Type t) { 1540 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1541 } 1542 1543 TreeTranslator removeClassParams = new TreeTranslator() { 1544 @Override 1545 public void visitTypeApply(JCTypeApply tree) { 1546 result = translate(tree.clazz); 1547 } 1548 }; 1549 1550 CheckContext conditionalContext(CheckContext checkContext) { 1551 return new Check.NestedCheckContext(checkContext) { 1552 //this will use enclosing check context to check compatibility of 1553 //subexpression against target type; if we are in a method check context, 1554 //depending on whether boxing is allowed, we could have incompatibilities 1555 @Override 1556 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1557 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1558 } 1559 }; 1560 } 1561 1562 /** Compute the type of a conditional expression, after 1563 * checking that it exists. See JLS 15.25. Does not take into 1564 * account the special case where condition and both arms 1565 * are constants. 1566 * 1567 * @param pos The source position to be used for error 1568 * diagnostics. 1569 * @param thentype The type of the expression's then-part. 1570 * @param elsetype The type of the expression's else-part. 1571 */ 1572 Type condType(DiagnosticPosition pos, 1573 Type thentype, Type elsetype) { 1574 // If same type, that is the result 1575 if (types.isSameType(thentype, elsetype)) 1576 return thentype.baseType(); 1577 1578 Type thenUnboxed = (thentype.isPrimitive()) 1579 ? thentype : types.unboxedType(thentype); 1580 Type elseUnboxed = (elsetype.isPrimitive()) 1581 ? elsetype : types.unboxedType(elsetype); 1582 1583 // Otherwise, if both arms can be converted to a numeric 1584 // type, return the least numeric type that fits both arms 1585 // (i.e. return larger of the two, or return int if one 1586 // arm is short, the other is char). 1587 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1588 // If one arm has an integer subrange type (i.e., byte, 1589 // short, or char), and the other is an integer constant 1590 // that fits into the subrange, return the subrange type. 1591 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1592 elseUnboxed.hasTag(INT) && 1593 types.isAssignable(elseUnboxed, thenUnboxed)) { 1594 return thenUnboxed.baseType(); 1595 } 1596 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1597 thenUnboxed.hasTag(INT) && 1598 types.isAssignable(thenUnboxed, elseUnboxed)) { 1599 return elseUnboxed.baseType(); 1600 } 1601 1602 for (TypeTag tag : primitiveTags) { 1603 Type candidate = syms.typeOfTag[tag.ordinal()]; 1604 if (types.isSubtype(thenUnboxed, candidate) && 1605 types.isSubtype(elseUnboxed, candidate)) { 1606 return candidate; 1607 } 1608 } 1609 } 1610 1611 // Those were all the cases that could result in a primitive 1612 if (thentype.isPrimitive()) 1613 thentype = types.boxedClass(thentype).type; 1614 if (elsetype.isPrimitive()) 1615 elsetype = types.boxedClass(elsetype).type; 1616 1617 if (types.isSubtype(thentype, elsetype)) 1618 return elsetype.baseType(); 1619 if (types.isSubtype(elsetype, thentype)) 1620 return thentype.baseType(); 1621 1622 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1623 log.error(pos, "neither.conditional.subtype", 1624 thentype, elsetype); 1625 return thentype.baseType(); 1626 } 1627 1628 // both are known to be reference types. The result is 1629 // lub(thentype,elsetype). This cannot fail, as it will 1630 // always be possible to infer "Object" if nothing better. 1631 return types.lub(thentype.baseType(), elsetype.baseType()); 1632 } 1633 1634 final static TypeTag[] primitiveTags = new TypeTag[]{ 1635 BYTE, 1636 CHAR, 1637 SHORT, 1638 INT, 1639 LONG, 1640 FLOAT, 1641 DOUBLE, 1642 BOOLEAN, 1643 }; 1644 1645 public void visitIf(JCIf tree) { 1646 attribExpr(tree.cond, env, syms.booleanType); 1647 attribStat(tree.thenpart, env); 1648 if (tree.elsepart != null) 1649 attribStat(tree.elsepart, env); 1650 chk.checkEmptyIf(tree); 1651 result = null; 1652 } 1653 1654 public void visitExec(JCExpressionStatement tree) { 1655 //a fresh environment is required for 292 inference to work properly --- 1656 //see Infer.instantiatePolymorphicSignatureInstance() 1657 Env<AttrContext> localEnv = env.dup(tree); 1658 attribExpr(tree.expr, localEnv); 1659 result = null; 1660 } 1661 1662 public void visitBreak(JCBreak tree) { 1663 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1664 result = null; 1665 } 1666 1667 public void visitContinue(JCContinue tree) { 1668 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1669 result = null; 1670 } 1671 //where 1672 /** Return the target of a break or continue statement, if it exists, 1673 * report an error if not. 1674 * Note: The target of a labelled break or continue is the 1675 * (non-labelled) statement tree referred to by the label, 1676 * not the tree representing the labelled statement itself. 1677 * 1678 * @param pos The position to be used for error diagnostics 1679 * @param tag The tag of the jump statement. This is either 1680 * Tree.BREAK or Tree.CONTINUE. 1681 * @param label The label of the jump statement, or null if no 1682 * label is given. 1683 * @param env The environment current at the jump statement. 1684 */ 1685 private JCTree findJumpTarget(DiagnosticPosition pos, 1686 JCTree.Tag tag, 1687 Name label, 1688 Env<AttrContext> env) { 1689 // Search environments outwards from the point of jump. 1690 Env<AttrContext> env1 = env; 1691 LOOP: 1692 while (env1 != null) { 1693 switch (env1.tree.getTag()) { 1694 case LABELLED: 1695 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1696 if (label == labelled.label) { 1697 // If jump is a continue, check that target is a loop. 1698 if (tag == CONTINUE) { 1699 if (!labelled.body.hasTag(DOLOOP) && 1700 !labelled.body.hasTag(WHILELOOP) && 1701 !labelled.body.hasTag(FORLOOP) && 1702 !labelled.body.hasTag(FOREACHLOOP)) 1703 log.error(pos, "not.loop.label", label); 1704 // Found labelled statement target, now go inwards 1705 // to next non-labelled tree. 1706 return TreeInfo.referencedStatement(labelled); 1707 } else { 1708 return labelled; 1709 } 1710 } 1711 break; 1712 case DOLOOP: 1713 case WHILELOOP: 1714 case FORLOOP: 1715 case FOREACHLOOP: 1716 if (label == null) return env1.tree; 1717 break; 1718 case SWITCH: 1719 if (label == null && tag == BREAK) return env1.tree; 1720 break; 1721 case LAMBDA: 1722 case METHODDEF: 1723 case CLASSDEF: 1724 break LOOP; 1725 default: 1726 } 1727 env1 = env1.next; 1728 } 1729 if (label != null) 1730 log.error(pos, "undef.label", label); 1731 else if (tag == CONTINUE) 1732 log.error(pos, "cont.outside.loop"); 1733 else 1734 log.error(pos, "break.outside.switch.loop"); 1735 return null; 1736 } 1737 1738 public void visitReturn(JCReturn tree) { 1739 // Check that there is an enclosing method which is 1740 // nested within than the enclosing class. 1741 if (env.info.returnResult == null) { 1742 log.error(tree.pos(), "ret.outside.meth"); 1743 } else { 1744 // Attribute return expression, if it exists, and check that 1745 // it conforms to result type of enclosing method. 1746 if (tree.expr != null) { 1747 if (env.info.returnResult.pt.hasTag(VOID)) { 1748 env.info.returnResult.checkContext.report(tree.expr.pos(), 1749 diags.fragment("unexpected.ret.val")); 1750 } 1751 attribTree(tree.expr, env, env.info.returnResult); 1752 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1753 !env.info.returnResult.pt.hasTag(NONE)) { 1754 env.info.returnResult.checkContext.report(tree.pos(), 1755 diags.fragment("missing.ret.val")); 1756 } 1757 } 1758 result = null; 1759 } 1760 1761 public void visitThrow(JCThrow tree) { 1762 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1763 if (allowPoly) { 1764 chk.checkType(tree, owntype, syms.throwableType); 1765 } 1766 result = null; 1767 } 1768 1769 public void visitAssert(JCAssert tree) { 1770 attribExpr(tree.cond, env, syms.booleanType); 1771 if (tree.detail != null) { 1772 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1773 } 1774 result = null; 1775 } 1776 1777 /** Visitor method for method invocations. 1778 * NOTE: The method part of an application will have in its type field 1779 * the return type of the method, not the method's type itself! 1780 */ 1781 public void visitApply(JCMethodInvocation tree) { 1782 // The local environment of a method application is 1783 // a new environment nested in the current one. 1784 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1785 1786 // The types of the actual method arguments. 1787 List<Type> argtypes; 1788 1789 // The types of the actual method type arguments. 1790 List<Type> typeargtypes = null; 1791 1792 Name methName = TreeInfo.name(tree.meth); 1793 1794 boolean isConstructorCall = 1795 methName == names._this || methName == names._super; 1796 1797 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1798 if (isConstructorCall) { 1799 // We are seeing a ...this(...) or ...super(...) call. 1800 // Check that this is the first statement in a constructor. 1801 if (checkFirstConstructorStat(tree, env)) { 1802 1803 // Record the fact 1804 // that this is a constructor call (using isSelfCall). 1805 localEnv.info.isSelfCall = true; 1806 1807 // Attribute arguments, yielding list of argument types. 1808 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 1809 argtypes = argtypesBuf.toList(); 1810 typeargtypes = attribTypes(tree.typeargs, localEnv); 1811 1812 // Variable `site' points to the class in which the called 1813 // constructor is defined. 1814 Type site = env.enclClass.sym.type; 1815 if (methName == names._super) { 1816 if (site == syms.objectType) { 1817 log.error(tree.meth.pos(), "no.superclass", site); 1818 site = types.createErrorType(syms.objectType); 1819 } else { 1820 site = types.supertype(site); 1821 } 1822 } 1823 1824 if (site.hasTag(CLASS)) { 1825 Type encl = site.getEnclosingType(); 1826 while (encl != null && encl.hasTag(TYPEVAR)) 1827 encl = encl.getUpperBound(); 1828 if (encl.hasTag(CLASS)) { 1829 // we are calling a nested class 1830 1831 if (tree.meth.hasTag(SELECT)) { 1832 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1833 1834 // We are seeing a prefixed call, of the form 1835 // <expr>.super(...). 1836 // Check that the prefix expression conforms 1837 // to the outer instance type of the class. 1838 chk.checkRefType(qualifier.pos(), 1839 attribExpr(qualifier, localEnv, 1840 encl)); 1841 } else if (methName == names._super) { 1842 // qualifier omitted; check for existence 1843 // of an appropriate implicit qualifier. 1844 rs.resolveImplicitThis(tree.meth.pos(), 1845 localEnv, site, true); 1846 } 1847 } else if (tree.meth.hasTag(SELECT)) { 1848 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1849 site.tsym); 1850 } 1851 1852 // if we're calling a java.lang.Enum constructor, 1853 // prefix the implicit String and int parameters 1854 if (site.tsym == syms.enumSym) 1855 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1856 1857 // Resolve the called constructor under the assumption 1858 // that we are referring to a superclass instance of the 1859 // current instance (JLS ???). 1860 boolean selectSuperPrev = localEnv.info.selectSuper; 1861 localEnv.info.selectSuper = true; 1862 localEnv.info.pendingResolutionPhase = null; 1863 Symbol sym = rs.resolveConstructor( 1864 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1865 localEnv.info.selectSuper = selectSuperPrev; 1866 1867 // Set method symbol to resolved constructor... 1868 TreeInfo.setSymbol(tree.meth, sym); 1869 1870 // ...and check that it is legal in the current context. 1871 // (this will also set the tree's type) 1872 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1873 checkId(tree.meth, site, sym, localEnv, 1874 new ResultInfo(kind, mpt)); 1875 } 1876 // Otherwise, `site' is an error type and we do nothing 1877 } 1878 result = tree.type = syms.voidType; 1879 } else { 1880 // Otherwise, we are seeing a regular method call. 1881 // Attribute the arguments, yielding list of argument types, ... 1882 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1883 argtypes = argtypesBuf.toList(); 1884 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1885 1886 // ... and attribute the method using as a prototype a methodtype 1887 // whose formal argument types is exactly the list of actual 1888 // arguments (this will also set the method symbol). 1889 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1890 localEnv.info.pendingResolutionPhase = null; 1891 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1892 1893 // Compute the result type. 1894 Type restype = mtype.getReturnType(); 1895 if (restype.hasTag(WILDCARD)) 1896 throw new AssertionError(mtype); 1897 1898 Type qualifier = (tree.meth.hasTag(SELECT)) 1899 ? ((JCFieldAccess) tree.meth).selected.type 1900 : env.enclClass.sym.type; 1901 Symbol msym = TreeInfo.symbol(tree.meth); 1902 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 1903 1904 chk.checkRefTypes(tree.typeargs, typeargtypes); 1905 1906 // Check that value of resulting type is admissible in the 1907 // current context. Also, capture the return type 1908 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 1909 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 1910 } 1911 chk.validate(tree.typeargs, localEnv); 1912 } 1913 //where 1914 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1915 if (msym != null && 1916 msym.owner == syms.objectType.tsym && 1917 methodName == names.getClass && 1918 argtypes.isEmpty()) { 1919 // as a special case, x.getClass() has type Class<? extends |X|> 1920 return new ClassType(restype.getEnclosingType(), 1921 List.of(new WildcardType(types.erasure(qualifierType), 1922 BoundKind.EXTENDS, 1923 syms.boundClass)), 1924 restype.tsym, 1925 restype.getMetadata()); 1926 } else if (msym != null && 1927 msym.owner == syms.arrayClass && 1928 methodName == names.clone && 1929 types.isArray(qualifierType)) { 1930 // as a special case, array.clone() has a result that is 1931 // the same as static type of the array being cloned 1932 return qualifierType; 1933 } else { 1934 return restype; 1935 } 1936 } 1937 1938 /** Check that given application node appears as first statement 1939 * in a constructor call. 1940 * @param tree The application node 1941 * @param env The environment current at the application. 1942 */ 1943 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1944 JCMethodDecl enclMethod = env.enclMethod; 1945 if (enclMethod != null && enclMethod.name == names.init) { 1946 JCBlock body = enclMethod.body; 1947 if (body.stats.head.hasTag(EXEC) && 1948 ((JCExpressionStatement) body.stats.head).expr == tree) 1949 return true; 1950 } 1951 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1952 TreeInfo.name(tree.meth)); 1953 return false; 1954 } 1955 1956 /** Obtain a method type with given argument types. 1957 */ 1958 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1959 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass); 1960 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1961 } 1962 1963 public void visitNewClass(final JCNewClass tree) { 1964 Type owntype = types.createErrorType(tree.type); 1965 1966 // The local environment of a class creation is 1967 // a new environment nested in the current one. 1968 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1969 1970 // The anonymous inner class definition of the new expression, 1971 // if one is defined by it. 1972 JCClassDecl cdef = tree.def; 1973 1974 // If enclosing class is given, attribute it, and 1975 // complete class name to be fully qualified 1976 JCExpression clazz = tree.clazz; // Class field following new 1977 JCExpression clazzid; // Identifier in class field 1978 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1979 annoclazzid = null; 1980 1981 if (clazz.hasTag(TYPEAPPLY)) { 1982 clazzid = ((JCTypeApply) clazz).clazz; 1983 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1984 annoclazzid = (JCAnnotatedType) clazzid; 1985 clazzid = annoclazzid.underlyingType; 1986 } 1987 } else { 1988 if (clazz.hasTag(ANNOTATED_TYPE)) { 1989 annoclazzid = (JCAnnotatedType) clazz; 1990 clazzid = annoclazzid.underlyingType; 1991 } else { 1992 clazzid = clazz; 1993 } 1994 } 1995 1996 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1997 1998 if (tree.encl != null) { 1999 // We are seeing a qualified new, of the form 2000 // <expr>.new C <...> (...) ... 2001 // In this case, we let clazz stand for the name of the 2002 // allocated class C prefixed with the type of the qualifier 2003 // expression, so that we can 2004 // resolve it with standard techniques later. I.e., if 2005 // <expr> has type T, then <expr>.new C <...> (...) 2006 // yields a clazz T.C. 2007 Type encltype = chk.checkRefType(tree.encl.pos(), 2008 attribExpr(tree.encl, env)); 2009 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2010 // from expr to the combined type, or not? Yes, do this. 2011 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2012 ((JCIdent) clazzid).name); 2013 2014 EndPosTable endPosTable = this.env.toplevel.endPositions; 2015 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2016 if (clazz.hasTag(ANNOTATED_TYPE)) { 2017 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2018 List<JCAnnotation> annos = annoType.annotations; 2019 2020 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2021 clazzid1 = make.at(tree.pos). 2022 TypeApply(clazzid1, 2023 ((JCTypeApply) clazz).arguments); 2024 } 2025 2026 clazzid1 = make.at(tree.pos). 2027 AnnotatedType(annos, clazzid1); 2028 } else if (clazz.hasTag(TYPEAPPLY)) { 2029 clazzid1 = make.at(tree.pos). 2030 TypeApply(clazzid1, 2031 ((JCTypeApply) clazz).arguments); 2032 } 2033 2034 clazz = clazzid1; 2035 } 2036 2037 // Attribute clazz expression and store 2038 // symbol + type back into the attributed tree. 2039 Type clazztype; 2040 2041 try { 2042 env.info.isNewClass = true; 2043 clazztype = TreeInfo.isEnumInit(env.tree) ? 2044 attribIdentAsEnumType(env, (JCIdent)clazz) : 2045 attribType(clazz, env); 2046 } finally { 2047 env.info.isNewClass = false; 2048 } 2049 2050 clazztype = chk.checkDiamond(tree, clazztype); 2051 chk.validate(clazz, localEnv); 2052 if (tree.encl != null) { 2053 // We have to work in this case to store 2054 // symbol + type back into the attributed tree. 2055 tree.clazz.type = clazztype; 2056 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2057 clazzid.type = ((JCIdent) clazzid).sym.type; 2058 if (annoclazzid != null) { 2059 annoclazzid.type = clazzid.type; 2060 } 2061 if (!clazztype.isErroneous()) { 2062 if (cdef != null && clazztype.tsym.isInterface()) { 2063 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2064 } else if (clazztype.tsym.isStatic()) { 2065 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2066 } 2067 } 2068 } else if (!clazztype.tsym.isInterface() && 2069 clazztype.getEnclosingType().hasTag(CLASS)) { 2070 // Check for the existence of an apropos outer instance 2071 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2072 } 2073 2074 // Attribute constructor arguments. 2075 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2076 final KindSelector pkind = 2077 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2078 List<Type> argtypes = argtypesBuf.toList(); 2079 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2080 2081 // If we have made no mistakes in the class type... 2082 if (clazztype.hasTag(CLASS)) { 2083 // Enums may not be instantiated except implicitly 2084 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2085 (!env.tree.hasTag(VARDEF) || 2086 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2087 ((JCVariableDecl) env.tree).init != tree)) 2088 log.error(tree.pos(), "enum.cant.be.instantiated"); 2089 2090 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2091 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2092 boolean skipNonDiamondPath = false; 2093 // Check that class is not abstract 2094 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2095 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2096 log.error(tree.pos(), "abstract.cant.be.instantiated", 2097 clazztype.tsym); 2098 skipNonDiamondPath = true; 2099 } else if (cdef != null && clazztype.tsym.isInterface()) { 2100 // Check that no constructor arguments are given to 2101 // anonymous classes implementing an interface 2102 if (!argtypes.isEmpty()) 2103 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2104 2105 if (!typeargtypes.isEmpty()) 2106 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2107 2108 // Error recovery: pretend no arguments were supplied. 2109 argtypes = List.nil(); 2110 typeargtypes = List.nil(); 2111 skipNonDiamondPath = true; 2112 } 2113 if (TreeInfo.isDiamond(tree)) { 2114 ClassType site = new ClassType(clazztype.getEnclosingType(), 2115 clazztype.tsym.type.getTypeArguments(), 2116 clazztype.tsym, 2117 clazztype.getMetadata()); 2118 2119 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2120 diamondEnv.info.selectSuper = cdef != null; 2121 diamondEnv.info.pendingResolutionPhase = null; 2122 2123 //if the type of the instance creation expression is a class type 2124 //apply method resolution inference (JLS 15.12.2.7). The return type 2125 //of the resolved constructor will be a partially instantiated type 2126 Symbol constructor = rs.resolveDiamond(tree.pos(), 2127 diamondEnv, 2128 site, 2129 argtypes, 2130 typeargtypes); 2131 tree.constructor = constructor.baseSymbol(); 2132 2133 final TypeSymbol csym = clazztype.tsym; 2134 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2135 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2136 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2137 constructorType = checkId(tree, site, 2138 constructor, 2139 diamondEnv, 2140 diamondResult); 2141 2142 tree.clazz.type = types.createErrorType(clazztype); 2143 if (!constructorType.isErroneous()) { 2144 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2145 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2146 } 2147 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2148 } 2149 2150 // Resolve the called constructor under the assumption 2151 // that we are referring to a superclass instance of the 2152 // current instance (JLS ???). 2153 else if (!skipNonDiamondPath) { 2154 //the following code alters some of the fields in the current 2155 //AttrContext - hence, the current context must be dup'ed in 2156 //order to avoid downstream failures 2157 Env<AttrContext> rsEnv = localEnv.dup(tree); 2158 rsEnv.info.selectSuper = cdef != null; 2159 rsEnv.info.pendingResolutionPhase = null; 2160 tree.constructor = rs.resolveConstructor( 2161 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2162 if (cdef == null) { //do not check twice! 2163 tree.constructorType = checkId(tree, 2164 clazztype, 2165 tree.constructor, 2166 rsEnv, 2167 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2168 if (rsEnv.info.lastResolveVarargs()) 2169 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2170 } 2171 } 2172 2173 if (cdef != null) { 2174 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2175 return; 2176 } 2177 2178 if (tree.constructor != null && tree.constructor.kind == MTH) 2179 owntype = clazztype; 2180 } 2181 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2182 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2183 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2184 //we need to wait for inference to finish and then replace inference vars in the constructor type 2185 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2186 instantiatedContext -> { 2187 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2188 }); 2189 } 2190 chk.validate(tree.typeargs, localEnv); 2191 } 2192 2193 // where 2194 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2195 JCClassDecl cdef, Env<AttrContext> localEnv, 2196 List<Type> argtypes, List<Type> typeargtypes, 2197 KindSelector pkind) { 2198 // We are seeing an anonymous class instance creation. 2199 // In this case, the class instance creation 2200 // expression 2201 // 2202 // E.new <typeargs1>C<typargs2>(args) { ... } 2203 // 2204 // is represented internally as 2205 // 2206 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2207 // 2208 // This expression is then *transformed* as follows: 2209 // 2210 // (1) add an extends or implements clause 2211 // (2) add a constructor. 2212 // 2213 // For instance, if C is a class, and ET is the type of E, 2214 // the expression 2215 // 2216 // E.new <typeargs1>C<typargs2>(args) { ... } 2217 // 2218 // is translated to (where X is a fresh name and typarams is the 2219 // parameter list of the super constructor): 2220 // 2221 // new <typeargs1>X(<*nullchk*>E, args) where 2222 // X extends C<typargs2> { 2223 // <typarams> X(ET e, args) { 2224 // e.<typeargs1>super(args) 2225 // } 2226 // ... 2227 // } 2228 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2229 final boolean isDiamond = TreeInfo.isDiamond(tree); 2230 if (isDiamond 2231 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2232 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2233 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2234 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2235 instantiatedContext -> { 2236 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2237 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2238 ResultInfo prevResult = this.resultInfo; 2239 try { 2240 this.resultInfo = resultInfoForClassDefinition; 2241 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2242 localEnv, argtypes, typeargtypes, pkind); 2243 } finally { 2244 this.resultInfo = prevResult; 2245 } 2246 }); 2247 } else { 2248 if (isDiamond && clazztype.hasTag(CLASS)) { 2249 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2250 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2251 // One or more types inferred in the previous steps is non-denotable. 2252 Fragment fragment = Diamond(clazztype.tsym); 2253 log.error(tree.clazz.pos(), 2254 Errors.CantApplyDiamond1( 2255 fragment, 2256 invalidDiamondArgs.size() > 1 ? 2257 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2258 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2259 } 2260 // For <>(){}, inferred types must also be accessible. 2261 for (Type t : clazztype.getTypeArguments()) { 2262 rs.checkAccessibleType(env, t); 2263 } 2264 } 2265 2266 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2267 // false for isInterface call even when the original type is an interface. 2268 boolean implementing = clazztype.tsym.isInterface() || 2269 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2270 2271 if (implementing) { 2272 cdef.implementing = List.of(clazz); 2273 } else { 2274 cdef.extending = clazz; 2275 } 2276 2277 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2278 isSerializable(clazztype)) { 2279 localEnv.info.isSerializable = true; 2280 } 2281 2282 attribStat(cdef, localEnv); 2283 2284 List<Type> finalargtypes; 2285 // If an outer instance is given, 2286 // prefix it to the constructor arguments 2287 // and delete it from the new expression 2288 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2289 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2290 finalargtypes = argtypes.prepend(tree.encl.type); 2291 tree.encl = null; 2292 } else { 2293 finalargtypes = argtypes; 2294 } 2295 2296 // Reassign clazztype and recompute constructor. As this necessarily involves 2297 // another attribution pass for deferred types in the case of <>, replicate 2298 // them. Original arguments have right decorations already. 2299 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2300 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2301 } 2302 2303 clazztype = cdef.sym.type; 2304 Symbol sym = tree.constructor = rs.resolveConstructor( 2305 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2306 Assert.check(!sym.kind.isResolutionError()); 2307 tree.constructor = sym; 2308 tree.constructorType = checkId(tree, 2309 clazztype, 2310 tree.constructor, 2311 localEnv, 2312 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2313 } 2314 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2315 clazztype : types.createErrorType(tree.type); 2316 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2317 chk.validate(tree.typeargs, localEnv); 2318 } 2319 2320 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2321 return new Check.NestedCheckContext(checkContext) { 2322 @Override 2323 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2324 enclosingContext.report(clazz.clazz, 2325 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2326 } 2327 }; 2328 } 2329 2330 /** Make an attributed null check tree. 2331 */ 2332 public JCExpression makeNullCheck(JCExpression arg) { 2333 // optimization: new Outer() can never be null; skip null check 2334 if (arg.getTag() == NEWCLASS) 2335 return arg; 2336 // optimization: X.this is never null; skip null check 2337 Name name = TreeInfo.name(arg); 2338 if (name == names._this || name == names._super) return arg; 2339 2340 JCTree.Tag optag = NULLCHK; 2341 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2342 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2343 tree.type = arg.type; 2344 return tree; 2345 } 2346 2347 public void visitNewArray(JCNewArray tree) { 2348 Type owntype = types.createErrorType(tree.type); 2349 Env<AttrContext> localEnv = env.dup(tree); 2350 Type elemtype; 2351 if (tree.elemtype != null) { 2352 elemtype = attribType(tree.elemtype, localEnv); 2353 chk.validate(tree.elemtype, localEnv); 2354 owntype = elemtype; 2355 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2356 attribExpr(l.head, localEnv, syms.intType); 2357 owntype = new ArrayType(owntype, syms.arrayClass); 2358 } 2359 } else { 2360 // we are seeing an untyped aggregate { ... } 2361 // this is allowed only if the prototype is an array 2362 if (pt().hasTag(ARRAY)) { 2363 elemtype = types.elemtype(pt()); 2364 } else { 2365 if (!pt().hasTag(ERROR)) { 2366 log.error(tree.pos(), "illegal.initializer.for.type", 2367 pt()); 2368 } 2369 elemtype = types.createErrorType(pt()); 2370 } 2371 } 2372 if (tree.elems != null) { 2373 attribExprs(tree.elems, localEnv, elemtype); 2374 owntype = new ArrayType(elemtype, syms.arrayClass); 2375 } 2376 if (!types.isReifiable(elemtype)) 2377 log.error(tree.pos(), "generic.array.creation"); 2378 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2379 } 2380 2381 /* 2382 * A lambda expression can only be attributed when a target-type is available. 2383 * In addition, if the target-type is that of a functional interface whose 2384 * descriptor contains inference variables in argument position the lambda expression 2385 * is 'stuck' (see DeferredAttr). 2386 */ 2387 @Override 2388 public void visitLambda(final JCLambda that) { 2389 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2390 if (pt().hasTag(NONE)) { 2391 //lambda only allowed in assignment or method invocation/cast context 2392 log.error(that.pos(), "unexpected.lambda"); 2393 } 2394 result = that.type = types.createErrorType(pt()); 2395 return; 2396 } 2397 //create an environment for attribution of the lambda expression 2398 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2399 boolean needsRecovery = 2400 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2401 try { 2402 if (needsRecovery && isSerializable(pt())) { 2403 localEnv.info.isSerializable = true; 2404 localEnv.info.isLambda = true; 2405 } 2406 List<Type> explicitParamTypes = null; 2407 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2408 //attribute lambda parameters 2409 attribStats(that.params, localEnv); 2410 explicitParamTypes = TreeInfo.types(that.params); 2411 } 2412 2413 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2414 Type currentTarget = targetInfo.target; 2415 Type lambdaType = targetInfo.descriptor; 2416 2417 if (currentTarget.isErroneous()) { 2418 result = that.type = currentTarget; 2419 return; 2420 } 2421 2422 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2423 2424 if (lambdaType.hasTag(FORALL)) { 2425 //lambda expression target desc cannot be a generic method 2426 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2427 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2428 result = that.type = types.createErrorType(pt()); 2429 return; 2430 } 2431 2432 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2433 //add param type info in the AST 2434 List<Type> actuals = lambdaType.getParameterTypes(); 2435 List<JCVariableDecl> params = that.params; 2436 2437 boolean arityMismatch = false; 2438 2439 while (params.nonEmpty()) { 2440 if (actuals.isEmpty()) { 2441 //not enough actuals to perform lambda parameter inference 2442 arityMismatch = true; 2443 } 2444 //reset previously set info 2445 Type argType = arityMismatch ? 2446 syms.errType : 2447 actuals.head; 2448 params.head.vartype = make.at(params.head).Type(argType); 2449 params.head.sym = null; 2450 actuals = actuals.isEmpty() ? 2451 actuals : 2452 actuals.tail; 2453 params = params.tail; 2454 } 2455 2456 //attribute lambda parameters 2457 attribStats(that.params, localEnv); 2458 2459 if (arityMismatch) { 2460 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2461 result = that.type = types.createErrorType(currentTarget); 2462 return; 2463 } 2464 } 2465 2466 //from this point on, no recovery is needed; if we are in assignment context 2467 //we will be able to attribute the whole lambda body, regardless of errors; 2468 //if we are in a 'check' method context, and the lambda is not compatible 2469 //with the target-type, it will be recovered anyway in Attr.checkId 2470 needsRecovery = false; 2471 2472 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2473 lambdaBodyResult(that, lambdaType, resultInfo); 2474 2475 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2476 attribTree(that.getBody(), localEnv, bodyResultInfo); 2477 } else { 2478 JCBlock body = (JCBlock)that.body; 2479 attribStats(body.stats, localEnv); 2480 } 2481 2482 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2483 2484 boolean isSpeculativeRound = 2485 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2486 2487 preFlow(that); 2488 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2489 2490 that.type = currentTarget; //avoids recovery at this stage 2491 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2492 2493 if (!isSpeculativeRound) { 2494 //add thrown types as bounds to the thrown types free variables if needed: 2495 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2496 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2497 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2498 2499 chk.unhandled(inferredThrownTypes, thrownTypes); 2500 2501 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 2502 thrownTypes.stream() 2503 .filter(t -> t.hasTag(UNDETVAR)) 2504 .forEach(t -> ((UndetVar)t).setThrow()); 2505 } 2506 2507 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2508 } 2509 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2510 } catch (Types.FunctionDescriptorLookupError ex) { 2511 JCDiagnostic cause = ex.getDiagnostic(); 2512 resultInfo.checkContext.report(that, cause); 2513 result = that.type = types.createErrorType(pt()); 2514 return; 2515 } catch (Throwable t) { 2516 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2517 //as that would likely cause the same exception again. 2518 needsRecovery = false; 2519 throw t; 2520 } finally { 2521 localEnv.info.scope.leave(); 2522 if (needsRecovery) { 2523 attribTree(that, env, recoveryInfo); 2524 } 2525 } 2526 } 2527 //where 2528 class TargetInfo { 2529 Type target; 2530 Type descriptor; 2531 2532 public TargetInfo(Type target, Type descriptor) { 2533 this.target = target; 2534 this.descriptor = descriptor; 2535 } 2536 } 2537 2538 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2539 Type lambdaType; 2540 Type currentTarget = resultInfo.pt; 2541 if (resultInfo.pt != Type.recoveryType) { 2542 /* We need to adjust the target. If the target is an 2543 * intersection type, for example: SAM & I1 & I2 ... 2544 * the target will be updated to SAM 2545 */ 2546 currentTarget = targetChecker.visit(currentTarget, that); 2547 if (explicitParamTypes != null) { 2548 currentTarget = infer.instantiateFunctionalInterface(that, 2549 currentTarget, explicitParamTypes, resultInfo.checkContext); 2550 } 2551 currentTarget = types.removeWildcards(currentTarget); 2552 lambdaType = types.findDescriptorType(currentTarget); 2553 } else { 2554 currentTarget = Type.recoveryType; 2555 lambdaType = fallbackDescriptorType(that); 2556 } 2557 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2558 //lambda expression target desc cannot be a generic method 2559 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2560 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2561 currentTarget = types.createErrorType(pt()); 2562 } 2563 return new TargetInfo(currentTarget, lambdaType); 2564 } 2565 2566 void preFlow(JCLambda tree) { 2567 new PostAttrAnalyzer() { 2568 @Override 2569 public void scan(JCTree tree) { 2570 if (tree == null || 2571 (tree.type != null && 2572 tree.type == Type.stuckType)) { 2573 //don't touch stuck expressions! 2574 return; 2575 } 2576 super.scan(tree); 2577 } 2578 }.scan(tree); 2579 } 2580 2581 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2582 2583 @Override 2584 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2585 return t.isIntersection() ? 2586 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2587 } 2588 2589 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2590 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2591 Type target = null; 2592 for (Type bound : ict.getExplicitComponents()) { 2593 TypeSymbol boundSym = bound.tsym; 2594 if (types.isFunctionalInterface(boundSym) && 2595 types.findDescriptorSymbol(boundSym) == desc) { 2596 target = bound; 2597 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2598 //bound must be an interface 2599 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2600 } 2601 } 2602 return target != null ? 2603 target : 2604 ict.getExplicitComponents().head; //error recovery 2605 } 2606 2607 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2608 ListBuffer<Type> targs = new ListBuffer<>(); 2609 ListBuffer<Type> supertypes = new ListBuffer<>(); 2610 for (Type i : ict.interfaces_field) { 2611 if (i.isParameterized()) { 2612 targs.appendList(i.tsym.type.allparams()); 2613 } 2614 supertypes.append(i.tsym.type); 2615 } 2616 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2617 notionalIntf.allparams_field = targs.toList(); 2618 notionalIntf.tsym.flags_field |= INTERFACE; 2619 return notionalIntf.tsym; 2620 } 2621 2622 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2623 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2624 diags.fragment(key, args))); 2625 } 2626 }; 2627 2628 private Type fallbackDescriptorType(JCExpression tree) { 2629 switch (tree.getTag()) { 2630 case LAMBDA: 2631 JCLambda lambda = (JCLambda)tree; 2632 List<Type> argtypes = List.nil(); 2633 for (JCVariableDecl param : lambda.params) { 2634 argtypes = param.vartype != null ? 2635 argtypes.append(param.vartype.type) : 2636 argtypes.append(syms.errType); 2637 } 2638 return new MethodType(argtypes, Type.recoveryType, 2639 List.of(syms.throwableType), syms.methodClass); 2640 case REFERENCE: 2641 return new MethodType(List.nil(), Type.recoveryType, 2642 List.of(syms.throwableType), syms.methodClass); 2643 default: 2644 Assert.error("Cannot get here!"); 2645 } 2646 return null; 2647 } 2648 2649 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2650 final InferenceContext inferenceContext, final Type... ts) { 2651 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2652 } 2653 2654 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2655 final InferenceContext inferenceContext, final List<Type> ts) { 2656 if (inferenceContext.free(ts)) { 2657 inferenceContext.addFreeTypeListener(ts, 2658 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts))); 2659 } else { 2660 for (Type t : ts) { 2661 rs.checkAccessibleType(env, t); 2662 } 2663 } 2664 } 2665 2666 /** 2667 * Lambda/method reference have a special check context that ensures 2668 * that i.e. a lambda return type is compatible with the expected 2669 * type according to both the inherited context and the assignment 2670 * context. 2671 */ 2672 class FunctionalReturnContext extends Check.NestedCheckContext { 2673 2674 FunctionalReturnContext(CheckContext enclosingContext) { 2675 super(enclosingContext); 2676 } 2677 2678 @Override 2679 public boolean compatible(Type found, Type req, Warner warn) { 2680 //return type must be compatible in both current context and assignment context 2681 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 2682 } 2683 2684 @Override 2685 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2686 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2687 } 2688 } 2689 2690 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2691 2692 JCExpression expr; 2693 boolean expStmtExpected; 2694 2695 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2696 super(enclosingContext); 2697 this.expr = expr; 2698 } 2699 2700 @Override 2701 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2702 if (expStmtExpected) { 2703 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 2704 } else { 2705 super.report(pos, details); 2706 } 2707 } 2708 2709 @Override 2710 public boolean compatible(Type found, Type req, Warner warn) { 2711 //a void return is compatible with an expression statement lambda 2712 if (req.hasTag(VOID)) { 2713 expStmtExpected = true; 2714 return TreeInfo.isExpressionStatement(expr); 2715 } else { 2716 return super.compatible(found, req, warn); 2717 } 2718 } 2719 } 2720 2721 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2722 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2723 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2724 new FunctionalReturnContext(resultInfo.checkContext); 2725 2726 return descriptor.getReturnType() == Type.recoveryType ? 2727 recoveryInfo : 2728 new ResultInfo(KindSelector.VAL, 2729 descriptor.getReturnType(), funcContext); 2730 } 2731 2732 /** 2733 * Lambda compatibility. Check that given return types, thrown types, parameter types 2734 * are compatible with the expected functional interface descriptor. This means that: 2735 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2736 * types must be compatible with the return type of the expected descriptor. 2737 */ 2738 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2739 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2740 2741 //return values have already been checked - but if lambda has no return 2742 //values, we must ensure that void/value compatibility is correct; 2743 //this amounts at checking that, if a lambda body can complete normally, 2744 //the descriptor's return type must be void 2745 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2746 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2747 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2748 diags.fragment("missing.ret.val", returnType))); 2749 } 2750 2751 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2752 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2753 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2754 } 2755 } 2756 2757 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2758 * static field and that lambda has type annotations, these annotations will 2759 * also be stored at these fake clinit methods. 2760 * 2761 * LambdaToMethod also use fake clinit methods so they can be reused. 2762 * Also as LTM is a phase subsequent to attribution, the methods from 2763 * clinits can be safely removed by LTM to save memory. 2764 */ 2765 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2766 2767 public MethodSymbol removeClinit(ClassSymbol sym) { 2768 return clinits.remove(sym); 2769 } 2770 2771 /* This method returns an environment to be used to attribute a lambda 2772 * expression. 2773 * 2774 * The owner of this environment is a method symbol. If the current owner 2775 * is not a method, for example if the lambda is used to initialize 2776 * a field, then if the field is: 2777 * 2778 * - an instance field, we use the first constructor. 2779 * - a static field, we create a fake clinit method. 2780 */ 2781 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2782 Env<AttrContext> lambdaEnv; 2783 Symbol owner = env.info.scope.owner; 2784 if (owner.kind == VAR && owner.owner.kind == TYP) { 2785 //field initializer 2786 ClassSymbol enclClass = owner.enclClass(); 2787 Symbol newScopeOwner = env.info.scope.owner; 2788 /* if the field isn't static, then we can get the first constructor 2789 * and use it as the owner of the environment. This is what 2790 * LTM code is doing to look for type annotations so we are fine. 2791 */ 2792 if ((owner.flags() & STATIC) == 0) { 2793 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2794 newScopeOwner = s; 2795 break; 2796 } 2797 } else { 2798 /* if the field is static then we need to create a fake clinit 2799 * method, this method can later be reused by LTM. 2800 */ 2801 MethodSymbol clinit = clinits.get(enclClass); 2802 if (clinit == null) { 2803 Type clinitType = new MethodType(List.nil(), 2804 syms.voidType, List.nil(), syms.methodClass); 2805 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2806 names.clinit, clinitType, enclClass); 2807 clinit.params = List.nil(); 2808 clinits.put(enclClass, clinit); 2809 } 2810 newScopeOwner = clinit; 2811 } 2812 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2813 } else { 2814 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2815 } 2816 return lambdaEnv; 2817 } 2818 2819 @Override 2820 public void visitReference(final JCMemberReference that) { 2821 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2822 if (pt().hasTag(NONE)) { 2823 //method reference only allowed in assignment or method invocation/cast context 2824 log.error(that.pos(), "unexpected.mref"); 2825 } 2826 result = that.type = types.createErrorType(pt()); 2827 return; 2828 } 2829 final Env<AttrContext> localEnv = env.dup(that); 2830 try { 2831 //attribute member reference qualifier - if this is a constructor 2832 //reference, the expected kind must be a type 2833 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2834 2835 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2836 exprType = chk.checkConstructorRefType(that.expr, exprType); 2837 if (!exprType.isErroneous() && 2838 exprType.isRaw() && 2839 that.typeargs != null) { 2840 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2841 diags.fragment("mref.infer.and.explicit.params")); 2842 exprType = types.createErrorType(exprType); 2843 } 2844 } 2845 2846 if (exprType.isErroneous()) { 2847 //if the qualifier expression contains problems, 2848 //give up attribution of method reference 2849 result = that.type = exprType; 2850 return; 2851 } 2852 2853 if (TreeInfo.isStaticSelector(that.expr, names)) { 2854 //if the qualifier is a type, validate it; raw warning check is 2855 //omitted as we don't know at this stage as to whether this is a 2856 //raw selector (because of inference) 2857 chk.validate(that.expr, env, false); 2858 } else { 2859 Symbol lhsSym = TreeInfo.symbol(that.expr); 2860 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2861 } 2862 //attrib type-arguments 2863 List<Type> typeargtypes = List.nil(); 2864 if (that.typeargs != null) { 2865 typeargtypes = attribTypes(that.typeargs, localEnv); 2866 } 2867 2868 boolean isTargetSerializable = 2869 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2870 isSerializable(pt()); 2871 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2872 Type currentTarget = targetInfo.target; 2873 Type desc = targetInfo.descriptor; 2874 2875 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2876 List<Type> argtypes = desc.getParameterTypes(); 2877 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2878 2879 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2880 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2881 } 2882 2883 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2884 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2885 try { 2886 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2887 that.name, argtypes, typeargtypes, referenceCheck, 2888 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2889 } finally { 2890 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2891 } 2892 2893 Symbol refSym = refResult.fst; 2894 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2895 2896 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2897 * JDK-8075541 2898 */ 2899 if (refSym.kind != MTH) { 2900 boolean targetError; 2901 switch (refSym.kind) { 2902 case ABSENT_MTH: 2903 case MISSING_ENCL: 2904 targetError = false; 2905 break; 2906 case WRONG_MTH: 2907 case WRONG_MTHS: 2908 case AMBIGUOUS: 2909 case HIDDEN: 2910 case STATICERR: 2911 targetError = true; 2912 break; 2913 default: 2914 Assert.error("unexpected result kind " + refSym.kind); 2915 targetError = false; 2916 } 2917 2918 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2919 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2920 2921 JCDiagnostic.DiagnosticType diagKind = targetError ? 2922 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2923 2924 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2925 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2926 2927 if (targetError && currentTarget == Type.recoveryType) { 2928 //a target error doesn't make sense during recovery stage 2929 //as we don't know what actual parameter types are 2930 result = that.type = currentTarget; 2931 return; 2932 } else { 2933 if (targetError) { 2934 resultInfo.checkContext.report(that, diag); 2935 } else { 2936 log.report(diag); 2937 } 2938 result = that.type = types.createErrorType(currentTarget); 2939 return; 2940 } 2941 } 2942 2943 that.sym = refSym.baseSymbol(); 2944 that.kind = lookupHelper.referenceKind(that.sym); 2945 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2946 2947 if (desc.getReturnType() == Type.recoveryType) { 2948 // stop here 2949 result = that.type = currentTarget; 2950 return; 2951 } 2952 2953 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2954 Type enclosingType = exprType.getEnclosingType(); 2955 if (enclosingType != null && enclosingType.hasTag(CLASS)) { 2956 // Check for the existence of an apropriate outer instance 2957 rs.resolveImplicitThis(that.pos(), env, exprType); 2958 } 2959 } 2960 2961 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2962 2963 if (that.getMode() == ReferenceMode.INVOKE && 2964 TreeInfo.isStaticSelector(that.expr, names) && 2965 that.kind.isUnbound() && 2966 !desc.getParameterTypes().head.isParameterized()) { 2967 chk.checkRaw(that.expr, localEnv); 2968 } 2969 2970 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2971 exprType.getTypeArguments().nonEmpty()) { 2972 //static ref with class type-args 2973 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2974 diags.fragment("static.mref.with.targs")); 2975 result = that.type = types.createErrorType(currentTarget); 2976 return; 2977 } 2978 2979 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2980 // Check that super-qualified symbols are not abstract (JLS) 2981 rs.checkNonAbstract(that.pos(), that.sym); 2982 } 2983 2984 if (isTargetSerializable) { 2985 chk.checkAccessFromSerializableElement(that, true); 2986 } 2987 } 2988 2989 ResultInfo checkInfo = 2990 resultInfo.dup(newMethodTemplate( 2991 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2992 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2993 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2994 2995 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 2996 2997 if (that.kind.isUnbound() && 2998 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2999 //re-generate inference constraints for unbound receiver 3000 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 3001 //cannot happen as this has already been checked - we just need 3002 //to regenerate the inference constraints, as that has been lost 3003 //as a result of the call to inferenceContext.save() 3004 Assert.error("Can't get here"); 3005 } 3006 } 3007 3008 if (!refType.isErroneous()) { 3009 refType = types.createMethodTypeWithReturn(refType, 3010 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3011 } 3012 3013 //go ahead with standard method reference compatibility check - note that param check 3014 //is a no-op (as this has been taken care during method applicability) 3015 boolean isSpeculativeRound = 3016 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3017 3018 that.type = currentTarget; //avoids recovery at this stage 3019 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3020 if (!isSpeculativeRound) { 3021 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3022 } 3023 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3024 } catch (Types.FunctionDescriptorLookupError ex) { 3025 JCDiagnostic cause = ex.getDiagnostic(); 3026 resultInfo.checkContext.report(that, cause); 3027 result = that.type = types.createErrorType(pt()); 3028 return; 3029 } 3030 } 3031 //where 3032 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3033 //if this is a constructor reference, the expected kind must be a type 3034 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3035 KindSelector.VAL_TYP : KindSelector.TYP, 3036 Type.noType); 3037 } 3038 3039 3040 @SuppressWarnings("fallthrough") 3041 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3042 InferenceContext inferenceContext = checkContext.inferenceContext(); 3043 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3044 3045 Type resType; 3046 switch (tree.getMode()) { 3047 case NEW: 3048 if (!tree.expr.type.isRaw()) { 3049 resType = tree.expr.type; 3050 break; 3051 } 3052 default: 3053 resType = refType.getReturnType(); 3054 } 3055 3056 Type incompatibleReturnType = resType; 3057 3058 if (returnType.hasTag(VOID)) { 3059 incompatibleReturnType = null; 3060 } 3061 3062 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3063 if (resType.isErroneous() || 3064 new FunctionalReturnContext(checkContext).compatible(resType, returnType, 3065 checkContext.checkWarner(tree, resType, returnType))) { 3066 incompatibleReturnType = null; 3067 } 3068 } 3069 3070 if (incompatibleReturnType != null) { 3071 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3072 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3073 } else { 3074 if (inferenceContext.free(refType)) { 3075 // we need to wait for inference to finish and then replace inference vars in the referent type 3076 inferenceContext.addFreeTypeListener(List.of(refType), 3077 instantiatedContext -> { 3078 tree.referentType = instantiatedContext.asInstType(refType); 3079 }); 3080 } else { 3081 tree.referentType = refType; 3082 } 3083 } 3084 3085 if (!speculativeAttr) { 3086 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3087 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3088 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3089 } 3090 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 3091 thrownTypes.stream() 3092 .filter(t -> t.hasTag(UNDETVAR)) 3093 .forEach(t -> ((UndetVar)t).setThrow()); 3094 } 3095 } 3096 3097 /** 3098 * Set functional type info on the underlying AST. Note: as the target descriptor 3099 * might contain inference variables, we might need to register an hook in the 3100 * current inference context. 3101 */ 3102 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3103 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3104 if (checkContext.inferenceContext().free(descriptorType)) { 3105 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), 3106 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3107 inferenceContext.asInstType(primaryTarget), checkContext)); 3108 } else { 3109 ListBuffer<Type> targets = new ListBuffer<>(); 3110 if (pt.hasTag(CLASS)) { 3111 if (pt.isCompound()) { 3112 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3113 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3114 if (t != primaryTarget) { 3115 targets.append(types.removeWildcards(t)); 3116 } 3117 } 3118 } else { 3119 targets.append(types.removeWildcards(primaryTarget)); 3120 } 3121 } 3122 fExpr.targets = targets.toList(); 3123 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3124 pt != Type.recoveryType) { 3125 //check that functional interface class is well-formed 3126 try { 3127 /* Types.makeFunctionalInterfaceClass() may throw an exception 3128 * when it's executed post-inference. See the listener code 3129 * above. 3130 */ 3131 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3132 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3133 if (csym != null) { 3134 chk.checkImplementations(env.tree, csym, csym); 3135 try { 3136 //perform an additional functional interface check on the synthetic class, 3137 //as there may be spurious errors for raw targets - because of existing issues 3138 //with membership and inheritance (see JDK-8074570). 3139 csym.flags_field |= INTERFACE; 3140 types.findDescriptorType(csym.type); 3141 } catch (FunctionDescriptorLookupError err) { 3142 resultInfo.checkContext.report(fExpr, 3143 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3144 } 3145 } 3146 } catch (Types.FunctionDescriptorLookupError ex) { 3147 JCDiagnostic cause = ex.getDiagnostic(); 3148 resultInfo.checkContext.report(env.tree, cause); 3149 } 3150 } 3151 } 3152 } 3153 3154 public void visitParens(JCParens tree) { 3155 Type owntype = attribTree(tree.expr, env, resultInfo); 3156 result = check(tree, owntype, pkind(), resultInfo); 3157 Symbol sym = TreeInfo.symbol(tree); 3158 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3159 log.error(tree.pos(), "illegal.start.of.type"); 3160 } 3161 3162 public void visitAssign(JCAssign tree) { 3163 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3164 Type capturedType = capture(owntype); 3165 attribExpr(tree.rhs, env, owntype); 3166 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3167 } 3168 3169 public void visitAssignop(JCAssignOp tree) { 3170 // Attribute arguments. 3171 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3172 Type operand = attribExpr(tree.rhs, env); 3173 // Find operator. 3174 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3175 if (operator != operators.noOpSymbol && 3176 !owntype.isErroneous() && 3177 !operand.isErroneous()) { 3178 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3179 chk.checkCastable(tree.rhs.pos(), 3180 operator.type.getReturnType(), 3181 owntype); 3182 } 3183 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3184 } 3185 3186 public void visitUnary(JCUnary tree) { 3187 // Attribute arguments. 3188 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3189 ? attribTree(tree.arg, env, varAssignmentInfo) 3190 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3191 3192 // Find operator. 3193 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3194 Type owntype = types.createErrorType(tree.type); 3195 if (operator != operators.noOpSymbol && 3196 !argtype.isErroneous()) { 3197 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3198 ? tree.arg.type 3199 : operator.type.getReturnType(); 3200 int opc = ((OperatorSymbol)operator).opcode; 3201 3202 // If the argument is constant, fold it. 3203 if (argtype.constValue() != null) { 3204 Type ctype = cfolder.fold1(opc, argtype); 3205 if (ctype != null) { 3206 owntype = cfolder.coerce(ctype, owntype); 3207 } 3208 } 3209 } 3210 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3211 } 3212 3213 public void visitBinary(JCBinary tree) { 3214 // Attribute arguments. 3215 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3216 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3217 // Find operator. 3218 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3219 Type owntype = types.createErrorType(tree.type); 3220 if (operator != operators.noOpSymbol && 3221 !left.isErroneous() && 3222 !right.isErroneous()) { 3223 owntype = operator.type.getReturnType(); 3224 int opc = ((OperatorSymbol)operator).opcode; 3225 // If both arguments are constants, fold them. 3226 if (left.constValue() != null && right.constValue() != null) { 3227 Type ctype = cfolder.fold2(opc, left, right); 3228 if (ctype != null) { 3229 owntype = cfolder.coerce(ctype, owntype); 3230 } 3231 } 3232 3233 // Check that argument types of a reference ==, != are 3234 // castable to each other, (JLS 15.21). Note: unboxing 3235 // comparisons will not have an acmp* opc at this point. 3236 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3237 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3238 log.error(tree.pos(), "incomparable.types", left, right); 3239 } 3240 } 3241 3242 chk.checkDivZero(tree.rhs.pos(), operator, right); 3243 } 3244 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3245 } 3246 3247 public void visitTypeCast(final JCTypeCast tree) { 3248 Type clazztype = attribType(tree.clazz, env); 3249 chk.validate(tree.clazz, env, false); 3250 //a fresh environment is required for 292 inference to work properly --- 3251 //see Infer.instantiatePolymorphicSignatureInstance() 3252 Env<AttrContext> localEnv = env.dup(tree); 3253 //should we propagate the target type? 3254 final ResultInfo castInfo; 3255 JCExpression expr = TreeInfo.skipParens(tree.expr); 3256 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3257 if (isPoly) { 3258 //expression is a poly - we need to propagate target type info 3259 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3260 new Check.NestedCheckContext(resultInfo.checkContext) { 3261 @Override 3262 public boolean compatible(Type found, Type req, Warner warn) { 3263 return types.isCastable(found, req, warn); 3264 } 3265 }); 3266 } else { 3267 //standalone cast - target-type info is not propagated 3268 castInfo = unknownExprInfo; 3269 } 3270 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3271 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3272 if (exprtype.constValue() != null) 3273 owntype = cfolder.coerce(exprtype, owntype); 3274 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3275 if (!isPoly) 3276 chk.checkRedundantCast(localEnv, tree); 3277 } 3278 3279 public void visitTypeTest(JCInstanceOf tree) { 3280 Type exprtype = chk.checkNullOrRefType( 3281 tree.expr.pos(), attribExpr(tree.expr, env)); 3282 Type clazztype = attribType(tree.clazz, env); 3283 if (!clazztype.hasTag(TYPEVAR)) { 3284 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3285 } 3286 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3287 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3288 clazztype = types.createErrorType(clazztype); 3289 } 3290 chk.validate(tree.clazz, env, false); 3291 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3292 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3293 } 3294 3295 public void visitIndexed(JCArrayAccess tree) { 3296 Type owntype = types.createErrorType(tree.type); 3297 Type atype = attribExpr(tree.indexed, env); 3298 attribExpr(tree.index, env, syms.intType); 3299 if (types.isArray(atype)) 3300 owntype = types.elemtype(atype); 3301 else if (!atype.hasTag(ERROR)) 3302 log.error(tree.pos(), "array.req.but.found", atype); 3303 if (!pkind().contains(KindSelector.VAL)) 3304 owntype = capture(owntype); 3305 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3306 } 3307 3308 public void visitIdent(JCIdent tree) { 3309 Symbol sym; 3310 3311 // Find symbol 3312 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3313 // If we are looking for a method, the prototype `pt' will be a 3314 // method type with the type of the call's arguments as parameters. 3315 env.info.pendingResolutionPhase = null; 3316 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3317 } else if (tree.sym != null && tree.sym.kind != VAR) { 3318 sym = tree.sym; 3319 } else { 3320 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3321 } 3322 tree.sym = sym; 3323 3324 // (1) Also find the environment current for the class where 3325 // sym is defined (`symEnv'). 3326 // Only for pre-tiger versions (1.4 and earlier): 3327 // (2) Also determine whether we access symbol out of an anonymous 3328 // class in a this or super call. This is illegal for instance 3329 // members since such classes don't carry a this$n link. 3330 // (`noOuterThisPath'). 3331 Env<AttrContext> symEnv = env; 3332 boolean noOuterThisPath = false; 3333 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3334 sym.kind.matches(KindSelector.VAL_MTH) && 3335 sym.owner.kind == TYP && 3336 tree.name != names._this && tree.name != names._super) { 3337 3338 // Find environment in which identifier is defined. 3339 while (symEnv.outer != null && 3340 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3341 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3342 noOuterThisPath = false; 3343 symEnv = symEnv.outer; 3344 } 3345 } 3346 3347 // If symbol is a variable, ... 3348 if (sym.kind == VAR) { 3349 VarSymbol v = (VarSymbol)sym; 3350 3351 // ..., evaluate its initializer, if it has one, and check for 3352 // illegal forward reference. 3353 checkInit(tree, env, v, false); 3354 3355 // If we are expecting a variable (as opposed to a value), check 3356 // that the variable is assignable in the current environment. 3357 if (KindSelector.ASG.subset(pkind())) 3358 checkAssignable(tree.pos(), v, null, env); 3359 } 3360 3361 // In a constructor body, 3362 // if symbol is a field or instance method, check that it is 3363 // not accessed before the supertype constructor is called. 3364 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3365 sym.kind.matches(KindSelector.VAL_MTH) && 3366 sym.owner.kind == TYP && 3367 (sym.flags() & STATIC) == 0) { 3368 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3369 sym : thisSym(tree.pos(), env)); 3370 } 3371 Env<AttrContext> env1 = env; 3372 if (sym.kind != ERR && sym.kind != TYP && 3373 sym.owner != null && sym.owner != env1.enclClass.sym) { 3374 // If the found symbol is inaccessible, then it is 3375 // accessed through an enclosing instance. Locate this 3376 // enclosing instance: 3377 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3378 env1 = env1.outer; 3379 } 3380 3381 if (env.info.isSerializable) { 3382 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3383 } 3384 3385 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3386 } 3387 3388 public void visitSelect(JCFieldAccess tree) { 3389 // Determine the expected kind of the qualifier expression. 3390 KindSelector skind = KindSelector.NIL; 3391 if (tree.name == names._this || tree.name == names._super || 3392 tree.name == names._class) 3393 { 3394 skind = KindSelector.TYP; 3395 } else { 3396 if (pkind().contains(KindSelector.PCK)) 3397 skind = KindSelector.of(skind, KindSelector.PCK); 3398 if (pkind().contains(KindSelector.TYP)) 3399 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3400 if (pkind().contains(KindSelector.VAL_MTH)) 3401 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3402 } 3403 3404 // Attribute the qualifier expression, and determine its symbol (if any). 3405 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3406 if (!pkind().contains(KindSelector.TYP_PCK)) 3407 site = capture(site); // Capture field access 3408 3409 // don't allow T.class T[].class, etc 3410 if (skind == KindSelector.TYP) { 3411 Type elt = site; 3412 while (elt.hasTag(ARRAY)) 3413 elt = ((ArrayType)elt).elemtype; 3414 if (elt.hasTag(TYPEVAR)) { 3415 log.error(tree.pos(), "type.var.cant.be.deref"); 3416 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3417 tree.sym = tree.type.tsym; 3418 return ; 3419 } 3420 } 3421 3422 // If qualifier symbol is a type or `super', assert `selectSuper' 3423 // for the selection. This is relevant for determining whether 3424 // protected symbols are accessible. 3425 Symbol sitesym = TreeInfo.symbol(tree.selected); 3426 boolean selectSuperPrev = env.info.selectSuper; 3427 env.info.selectSuper = 3428 sitesym != null && 3429 sitesym.name == names._super; 3430 3431 // Determine the symbol represented by the selection. 3432 env.info.pendingResolutionPhase = null; 3433 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3434 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3435 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3436 sym = syms.errSymbol; 3437 } 3438 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3439 site = capture(site); 3440 sym = selectSym(tree, sitesym, site, env, resultInfo); 3441 } 3442 boolean varArgs = env.info.lastResolveVarargs(); 3443 tree.sym = sym; 3444 3445 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3446 site = types.skipTypeVars(site, true); 3447 } 3448 3449 // If that symbol is a variable, ... 3450 if (sym.kind == VAR) { 3451 VarSymbol v = (VarSymbol)sym; 3452 3453 // ..., evaluate its initializer, if it has one, and check for 3454 // illegal forward reference. 3455 checkInit(tree, env, v, true); 3456 3457 // If we are expecting a variable (as opposed to a value), check 3458 // that the variable is assignable in the current environment. 3459 if (KindSelector.ASG.subset(pkind())) 3460 checkAssignable(tree.pos(), v, tree.selected, env); 3461 } 3462 3463 if (sitesym != null && 3464 sitesym.kind == VAR && 3465 ((VarSymbol)sitesym).isResourceVariable() && 3466 sym.kind == MTH && 3467 sym.name.equals(names.close) && 3468 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3469 env.info.lint.isEnabled(LintCategory.TRY)) { 3470 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3471 } 3472 3473 // Disallow selecting a type from an expression 3474 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3475 tree.type = check(tree.selected, pt(), 3476 sitesym == null ? 3477 KindSelector.VAL : sitesym.kind.toSelector(), 3478 new ResultInfo(KindSelector.TYP_PCK, pt())); 3479 } 3480 3481 if (isType(sitesym)) { 3482 if (sym.name == names._this) { 3483 // If `C' is the currently compiled class, check that 3484 // C.this' does not appear in a call to a super(...) 3485 if (env.info.isSelfCall && 3486 site.tsym == env.enclClass.sym) { 3487 chk.earlyRefError(tree.pos(), sym); 3488 } 3489 } else { 3490 // Check if type-qualified fields or methods are static (JLS) 3491 if ((sym.flags() & STATIC) == 0 && 3492 sym.name != names._super && 3493 (sym.kind == VAR || sym.kind == MTH)) { 3494 rs.accessBase(rs.new StaticError(sym), 3495 tree.pos(), site, sym.name, true); 3496 } 3497 } 3498 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3499 sym.isStatic() && sym.kind == MTH) { 3500 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3501 } 3502 } else if (sym.kind != ERR && 3503 (sym.flags() & STATIC) != 0 && 3504 sym.name != names._class) { 3505 // If the qualified item is not a type and the selected item is static, report 3506 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3507 chk.warnStatic(tree, "static.not.qualified.by.type", 3508 sym.kind.kindName(), sym.owner); 3509 } 3510 3511 // If we are selecting an instance member via a `super', ... 3512 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3513 3514 // Check that super-qualified symbols are not abstract (JLS) 3515 rs.checkNonAbstract(tree.pos(), sym); 3516 3517 if (site.isRaw()) { 3518 // Determine argument types for site. 3519 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3520 if (site1 != null) site = site1; 3521 } 3522 } 3523 3524 if (env.info.isSerializable) { 3525 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3526 } 3527 3528 env.info.selectSuper = selectSuperPrev; 3529 result = checkId(tree, site, sym, env, resultInfo); 3530 } 3531 //where 3532 /** Determine symbol referenced by a Select expression, 3533 * 3534 * @param tree The select tree. 3535 * @param site The type of the selected expression, 3536 * @param env The current environment. 3537 * @param resultInfo The current result. 3538 */ 3539 private Symbol selectSym(JCFieldAccess tree, 3540 Symbol location, 3541 Type site, 3542 Env<AttrContext> env, 3543 ResultInfo resultInfo) { 3544 DiagnosticPosition pos = tree.pos(); 3545 Name name = tree.name; 3546 switch (site.getTag()) { 3547 case PACKAGE: 3548 return rs.accessBase( 3549 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3550 pos, location, site, name, true); 3551 case ARRAY: 3552 case CLASS: 3553 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3554 return rs.resolveQualifiedMethod( 3555 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3556 } else if (name == names._this || name == names._super) { 3557 return rs.resolveSelf(pos, env, site.tsym, name); 3558 } else if (name == names._class) { 3559 // In this case, we have already made sure in 3560 // visitSelect that qualifier expression is a type. 3561 Type t = syms.classType; 3562 List<Type> typeargs = List.of(types.erasure(site)); 3563 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3564 return new VarSymbol( 3565 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3566 } else { 3567 // We are seeing a plain identifier as selector. 3568 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3569 sym = rs.accessBase(sym, pos, location, site, name, true); 3570 return sym; 3571 } 3572 case WILDCARD: 3573 throw new AssertionError(tree); 3574 case TYPEVAR: 3575 // Normally, site.getUpperBound() shouldn't be null. 3576 // It should only happen during memberEnter/attribBase 3577 // when determining the super type which *must* beac 3578 // done before attributing the type variables. In 3579 // other words, we are seeing this illegal program: 3580 // class B<T> extends A<T.foo> {} 3581 Symbol sym = (site.getUpperBound() != null) 3582 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3583 : null; 3584 if (sym == null) { 3585 log.error(pos, "type.var.cant.be.deref"); 3586 return syms.errSymbol; 3587 } else { 3588 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3589 rs.new AccessError(env, site, sym) : 3590 sym; 3591 rs.accessBase(sym2, pos, location, site, name, true); 3592 return sym; 3593 } 3594 case ERROR: 3595 // preserve identifier names through errors 3596 return types.createErrorType(name, site.tsym, site).tsym; 3597 default: 3598 // The qualifier expression is of a primitive type -- only 3599 // .class is allowed for these. 3600 if (name == names._class) { 3601 // In this case, we have already made sure in Select that 3602 // qualifier expression is a type. 3603 Type t = syms.classType; 3604 Type arg = types.boxedClass(site).type; 3605 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3606 return new VarSymbol( 3607 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3608 } else { 3609 log.error(pos, "cant.deref", site); 3610 return syms.errSymbol; 3611 } 3612 } 3613 } 3614 3615 /** Determine type of identifier or select expression and check that 3616 * (1) the referenced symbol is not deprecated 3617 * (2) the symbol's type is safe (@see checkSafe) 3618 * (3) if symbol is a variable, check that its type and kind are 3619 * compatible with the prototype and protokind. 3620 * (4) if symbol is an instance field of a raw type, 3621 * which is being assigned to, issue an unchecked warning if its 3622 * type changes under erasure. 3623 * (5) if symbol is an instance method of a raw type, issue an 3624 * unchecked warning if its argument types change under erasure. 3625 * If checks succeed: 3626 * If symbol is a constant, return its constant type 3627 * else if symbol is a method, return its result type 3628 * otherwise return its type. 3629 * Otherwise return errType. 3630 * 3631 * @param tree The syntax tree representing the identifier 3632 * @param site If this is a select, the type of the selected 3633 * expression, otherwise the type of the current class. 3634 * @param sym The symbol representing the identifier. 3635 * @param env The current environment. 3636 * @param resultInfo The expected result 3637 */ 3638 Type checkId(JCTree tree, 3639 Type site, 3640 Symbol sym, 3641 Env<AttrContext> env, 3642 ResultInfo resultInfo) { 3643 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3644 checkMethodId(tree, site, sym, env, resultInfo) : 3645 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3646 } 3647 3648 Type checkMethodId(JCTree tree, 3649 Type site, 3650 Symbol sym, 3651 Env<AttrContext> env, 3652 ResultInfo resultInfo) { 3653 boolean isPolymorhicSignature = 3654 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3655 return isPolymorhicSignature ? 3656 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3657 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3658 } 3659 3660 Type checkSigPolyMethodId(JCTree tree, 3661 Type site, 3662 Symbol sym, 3663 Env<AttrContext> env, 3664 ResultInfo resultInfo) { 3665 //recover original symbol for signature polymorphic methods 3666 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3667 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3668 return sym.type; 3669 } 3670 3671 Type checkMethodIdInternal(JCTree tree, 3672 Type site, 3673 Symbol sym, 3674 Env<AttrContext> env, 3675 ResultInfo resultInfo) { 3676 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3677 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3678 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3679 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3680 return owntype; 3681 } else { 3682 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3683 } 3684 } 3685 3686 Type checkIdInternal(JCTree tree, 3687 Type site, 3688 Symbol sym, 3689 Type pt, 3690 Env<AttrContext> env, 3691 ResultInfo resultInfo) { 3692 if (pt.isErroneous()) { 3693 return types.createErrorType(site); 3694 } 3695 Type owntype; // The computed type of this identifier occurrence. 3696 switch (sym.kind) { 3697 case TYP: 3698 // For types, the computed type equals the symbol's type, 3699 // except for two situations: 3700 owntype = sym.type; 3701 if (owntype.hasTag(CLASS)) { 3702 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3703 Type ownOuter = owntype.getEnclosingType(); 3704 3705 // (a) If the symbol's type is parameterized, erase it 3706 // because no type parameters were given. 3707 // We recover generic outer type later in visitTypeApply. 3708 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3709 owntype = types.erasure(owntype); 3710 } 3711 3712 // (b) If the symbol's type is an inner class, then 3713 // we have to interpret its outer type as a superclass 3714 // of the site type. Example: 3715 // 3716 // class Tree<A> { class Visitor { ... } } 3717 // class PointTree extends Tree<Point> { ... } 3718 // ...PointTree.Visitor... 3719 // 3720 // Then the type of the last expression above is 3721 // Tree<Point>.Visitor. 3722 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3723 Type normOuter = site; 3724 if (normOuter.hasTag(CLASS)) { 3725 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3726 } 3727 if (normOuter == null) // perhaps from an import 3728 normOuter = types.erasure(ownOuter); 3729 if (normOuter != ownOuter) 3730 owntype = new ClassType( 3731 normOuter, List.nil(), owntype.tsym, 3732 owntype.getMetadata()); 3733 } 3734 } 3735 break; 3736 case VAR: 3737 VarSymbol v = (VarSymbol)sym; 3738 // Test (4): if symbol is an instance field of a raw type, 3739 // which is being assigned to, issue an unchecked warning if 3740 // its type changes under erasure. 3741 if (KindSelector.ASG.subset(pkind()) && 3742 v.owner.kind == TYP && 3743 (v.flags() & STATIC) == 0 && 3744 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3745 Type s = types.asOuterSuper(site, v.owner); 3746 if (s != null && 3747 s.isRaw() && 3748 !types.isSameType(v.type, v.erasure(types))) { 3749 chk.warnUnchecked(tree.pos(), 3750 "unchecked.assign.to.var", 3751 v, s); 3752 } 3753 } 3754 // The computed type of a variable is the type of the 3755 // variable symbol, taken as a member of the site type. 3756 owntype = (sym.owner.kind == TYP && 3757 sym.name != names._this && sym.name != names._super) 3758 ? types.memberType(site, sym) 3759 : sym.type; 3760 3761 // If the variable is a constant, record constant value in 3762 // computed type. 3763 if (v.getConstValue() != null && isStaticReference(tree)) 3764 owntype = owntype.constType(v.getConstValue()); 3765 3766 if (resultInfo.pkind == KindSelector.VAL) { 3767 owntype = capture(owntype); // capture "names as expressions" 3768 } 3769 break; 3770 case MTH: { 3771 owntype = checkMethod(site, sym, 3772 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3773 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3774 resultInfo.pt.getTypeArguments()); 3775 break; 3776 } 3777 case PCK: case ERR: 3778 owntype = sym.type; 3779 break; 3780 default: 3781 throw new AssertionError("unexpected kind: " + sym.kind + 3782 " in tree " + tree); 3783 } 3784 3785 // Emit a `deprecation' warning if symbol is deprecated. 3786 // (for constructors (but not for constructor references), the error 3787 // was given when the constructor was resolved) 3788 3789 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3790 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3791 chk.checkSunAPI(tree.pos(), sym); 3792 chk.checkProfile(tree.pos(), sym); 3793 } 3794 3795 // If symbol is a variable, check that its type and 3796 // kind are compatible with the prototype and protokind. 3797 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3798 } 3799 3800 /** Check that variable is initialized and evaluate the variable's 3801 * initializer, if not yet done. Also check that variable is not 3802 * referenced before it is defined. 3803 * @param tree The tree making up the variable reference. 3804 * @param env The current environment. 3805 * @param v The variable's symbol. 3806 */ 3807 private void checkInit(JCTree tree, 3808 Env<AttrContext> env, 3809 VarSymbol v, 3810 boolean onlyWarning) { 3811 // A forward reference is diagnosed if the declaration position 3812 // of the variable is greater than the current tree position 3813 // and the tree and variable definition occur in the same class 3814 // definition. Note that writes don't count as references. 3815 // This check applies only to class and instance 3816 // variables. Local variables follow different scope rules, 3817 // and are subject to definite assignment checking. 3818 Env<AttrContext> initEnv = enclosingInitEnv(env); 3819 if (initEnv != null && 3820 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3821 v.owner.kind == TYP && 3822 v.owner == env.info.scope.owner.enclClass() && 3823 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3824 (!env.tree.hasTag(ASSIGN) || 3825 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3826 String suffix = (initEnv.info.enclVar == v) ? 3827 "self.ref" : "forward.ref"; 3828 if (!onlyWarning || isStaticEnumField(v)) { 3829 log.error(tree.pos(), "illegal." + suffix); 3830 } else if (useBeforeDeclarationWarning) { 3831 log.warning(tree.pos(), suffix, v); 3832 } 3833 } 3834 3835 v.getConstValue(); // ensure initializer is evaluated 3836 3837 checkEnumInitializer(tree, env, v); 3838 } 3839 3840 /** 3841 * Returns the enclosing init environment associated with this env (if any). An init env 3842 * can be either a field declaration env or a static/instance initializer env. 3843 */ 3844 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3845 while (true) { 3846 switch (env.tree.getTag()) { 3847 case VARDEF: 3848 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3849 if (vdecl.sym.owner.kind == TYP) { 3850 //field 3851 return env; 3852 } 3853 break; 3854 case BLOCK: 3855 if (env.next.tree.hasTag(CLASSDEF)) { 3856 //instance/static initializer 3857 return env; 3858 } 3859 break; 3860 case METHODDEF: 3861 case CLASSDEF: 3862 case TOPLEVEL: 3863 return null; 3864 } 3865 Assert.checkNonNull(env.next); 3866 env = env.next; 3867 } 3868 } 3869 3870 /** 3871 * Check for illegal references to static members of enum. In 3872 * an enum type, constructors and initializers may not 3873 * reference its static members unless they are constant. 3874 * 3875 * @param tree The tree making up the variable reference. 3876 * @param env The current environment. 3877 * @param v The variable's symbol. 3878 * @jls section 8.9 Enums 3879 */ 3880 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3881 // JLS: 3882 // 3883 // "It is a compile-time error to reference a static field 3884 // of an enum type that is not a compile-time constant 3885 // (15.28) from constructors, instance initializer blocks, 3886 // or instance variable initializer expressions of that 3887 // type. It is a compile-time error for the constructors, 3888 // instance initializer blocks, or instance variable 3889 // initializer expressions of an enum constant e to refer 3890 // to itself or to an enum constant of the same type that 3891 // is declared to the right of e." 3892 if (isStaticEnumField(v)) { 3893 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3894 3895 if (enclClass == null || enclClass.owner == null) 3896 return; 3897 3898 // See if the enclosing class is the enum (or a 3899 // subclass thereof) declaring v. If not, this 3900 // reference is OK. 3901 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3902 return; 3903 3904 // If the reference isn't from an initializer, then 3905 // the reference is OK. 3906 if (!Resolve.isInitializer(env)) 3907 return; 3908 3909 log.error(tree.pos(), "illegal.enum.static.ref"); 3910 } 3911 } 3912 3913 /** Is the given symbol a static, non-constant field of an Enum? 3914 * Note: enum literals should not be regarded as such 3915 */ 3916 private boolean isStaticEnumField(VarSymbol v) { 3917 return Flags.isEnum(v.owner) && 3918 Flags.isStatic(v) && 3919 !Flags.isConstant(v) && 3920 v.name != names._class; 3921 } 3922 3923 /** 3924 * Check that method arguments conform to its instantiation. 3925 **/ 3926 public Type checkMethod(Type site, 3927 final Symbol sym, 3928 ResultInfo resultInfo, 3929 Env<AttrContext> env, 3930 final List<JCExpression> argtrees, 3931 List<Type> argtypes, 3932 List<Type> typeargtypes) { 3933 // Test (5): if symbol is an instance method of a raw type, issue 3934 // an unchecked warning if its argument types change under erasure. 3935 if ((sym.flags() & STATIC) == 0 && 3936 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3937 Type s = types.asOuterSuper(site, sym.owner); 3938 if (s != null && s.isRaw() && 3939 !types.isSameTypes(sym.type.getParameterTypes(), 3940 sym.erasure(types).getParameterTypes())) { 3941 chk.warnUnchecked(env.tree.pos(), 3942 "unchecked.call.mbr.of.raw.type", 3943 sym, s); 3944 } 3945 } 3946 3947 if (env.info.defaultSuperCallSite != null) { 3948 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3949 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3950 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3951 List<MethodSymbol> icand_sup = 3952 types.interfaceCandidates(sup, (MethodSymbol)sym); 3953 if (icand_sup.nonEmpty() && 3954 icand_sup.head != sym && 3955 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3956 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3957 diags.fragment("overridden.default", sym, sup)); 3958 break; 3959 } 3960 } 3961 env.info.defaultSuperCallSite = null; 3962 } 3963 3964 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3965 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3966 if (app.meth.hasTag(SELECT) && 3967 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3968 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3969 } 3970 } 3971 3972 // Compute the identifier's instantiated type. 3973 // For methods, we need to compute the instance type by 3974 // Resolve.instantiate from the symbol's type as well as 3975 // any type arguments and value arguments. 3976 Warner noteWarner = new Warner(); 3977 try { 3978 Type owntype = rs.checkMethod( 3979 env, 3980 site, 3981 sym, 3982 resultInfo, 3983 argtypes, 3984 typeargtypes, 3985 noteWarner); 3986 3987 DeferredAttr.DeferredTypeMap checkDeferredMap = 3988 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3989 3990 argtypes = argtypes.map(checkDeferredMap); 3991 3992 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3993 chk.warnUnchecked(env.tree.pos(), 3994 "unchecked.meth.invocation.applied", 3995 kindName(sym), 3996 sym.name, 3997 rs.methodArguments(sym.type.getParameterTypes()), 3998 rs.methodArguments(argtypes.map(checkDeferredMap)), 3999 kindName(sym.location()), 4000 sym.location()); 4001 if (resultInfo.pt != Infer.anyPoly || 4002 !owntype.hasTag(METHOD) || 4003 !owntype.isPartial()) { 4004 //if this is not a partially inferred method type, erase return type. Otherwise, 4005 //erasure is carried out in PartiallyInferredMethodType.check(). 4006 owntype = new MethodType(owntype.getParameterTypes(), 4007 types.erasure(owntype.getReturnType()), 4008 types.erasure(owntype.getThrownTypes()), 4009 syms.methodClass); 4010 } 4011 } 4012 4013 PolyKind pkind = (sym.type.hasTag(FORALL) && 4014 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 4015 PolyKind.POLY : PolyKind.STANDALONE; 4016 TreeInfo.setPolyKind(env.tree, pkind); 4017 4018 return (resultInfo.pt == Infer.anyPoly) ? 4019 owntype : 4020 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4021 resultInfo.checkContext.inferenceContext()); 4022 } catch (Infer.InferenceException ex) { 4023 //invalid target type - propagate exception outwards or report error 4024 //depending on the current check context 4025 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 4026 return types.createErrorType(site); 4027 } catch (Resolve.InapplicableMethodException ex) { 4028 final JCDiagnostic diag = ex.getDiagnostic(); 4029 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 4030 @Override 4031 protected Pair<Symbol, JCDiagnostic> errCandidate() { 4032 return new Pair<>(sym, diag); 4033 } 4034 }; 4035 List<Type> argtypes2 = argtypes.map( 4036 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4037 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 4038 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 4039 log.report(errDiag); 4040 return types.createErrorType(site); 4041 } 4042 } 4043 4044 public void visitLiteral(JCLiteral tree) { 4045 result = check(tree, litType(tree.typetag).constType(tree.value), 4046 KindSelector.VAL, resultInfo); 4047 } 4048 //where 4049 /** Return the type of a literal with given type tag. 4050 */ 4051 Type litType(TypeTag tag) { 4052 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4053 } 4054 4055 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4056 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4057 } 4058 4059 public void visitTypeArray(JCArrayTypeTree tree) { 4060 Type etype = attribType(tree.elemtype, env); 4061 Type type = new ArrayType(etype, syms.arrayClass); 4062 result = check(tree, type, KindSelector.TYP, resultInfo); 4063 } 4064 4065 /** Visitor method for parameterized types. 4066 * Bound checking is left until later, since types are attributed 4067 * before supertype structure is completely known 4068 */ 4069 public void visitTypeApply(JCTypeApply tree) { 4070 Type owntype = types.createErrorType(tree.type); 4071 4072 // Attribute functor part of application and make sure it's a class. 4073 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4074 4075 // Attribute type parameters 4076 List<Type> actuals = attribTypes(tree.arguments, env); 4077 4078 if (clazztype.hasTag(CLASS)) { 4079 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4080 if (actuals.isEmpty()) //diamond 4081 actuals = formals; 4082 4083 if (actuals.length() == formals.length()) { 4084 List<Type> a = actuals; 4085 List<Type> f = formals; 4086 while (a.nonEmpty()) { 4087 a.head = a.head.withTypeVar(f.head); 4088 a = a.tail; 4089 f = f.tail; 4090 } 4091 // Compute the proper generic outer 4092 Type clazzOuter = clazztype.getEnclosingType(); 4093 if (clazzOuter.hasTag(CLASS)) { 4094 Type site; 4095 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4096 if (clazz.hasTag(IDENT)) { 4097 site = env.enclClass.sym.type; 4098 } else if (clazz.hasTag(SELECT)) { 4099 site = ((JCFieldAccess) clazz).selected.type; 4100 } else throw new AssertionError(""+tree); 4101 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4102 if (site.hasTag(CLASS)) 4103 site = types.asOuterSuper(site, clazzOuter.tsym); 4104 if (site == null) 4105 site = types.erasure(clazzOuter); 4106 clazzOuter = site; 4107 } 4108 } 4109 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4110 clazztype.getMetadata()); 4111 } else { 4112 if (formals.length() != 0) { 4113 log.error(tree.pos(), "wrong.number.type.args", 4114 Integer.toString(formals.length())); 4115 } else { 4116 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4117 } 4118 owntype = types.createErrorType(tree.type); 4119 } 4120 } 4121 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4122 } 4123 4124 public void visitTypeUnion(JCTypeUnion tree) { 4125 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4126 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4127 for (JCExpression typeTree : tree.alternatives) { 4128 Type ctype = attribType(typeTree, env); 4129 ctype = chk.checkType(typeTree.pos(), 4130 chk.checkClassType(typeTree.pos(), ctype), 4131 syms.throwableType); 4132 if (!ctype.isErroneous()) { 4133 //check that alternatives of a union type are pairwise 4134 //unrelated w.r.t. subtyping 4135 if (chk.intersects(ctype, multicatchTypes.toList())) { 4136 for (Type t : multicatchTypes) { 4137 boolean sub = types.isSubtype(ctype, t); 4138 boolean sup = types.isSubtype(t, ctype); 4139 if (sub || sup) { 4140 //assume 'a' <: 'b' 4141 Type a = sub ? ctype : t; 4142 Type b = sub ? t : ctype; 4143 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4144 } 4145 } 4146 } 4147 multicatchTypes.append(ctype); 4148 if (all_multicatchTypes != null) 4149 all_multicatchTypes.append(ctype); 4150 } else { 4151 if (all_multicatchTypes == null) { 4152 all_multicatchTypes = new ListBuffer<>(); 4153 all_multicatchTypes.appendList(multicatchTypes); 4154 } 4155 all_multicatchTypes.append(ctype); 4156 } 4157 } 4158 Type t = check(tree, types.lub(multicatchTypes.toList()), 4159 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4160 if (t.hasTag(CLASS)) { 4161 List<Type> alternatives = 4162 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4163 t = new UnionClassType((ClassType) t, alternatives); 4164 } 4165 tree.type = result = t; 4166 } 4167 4168 public void visitTypeIntersection(JCTypeIntersection tree) { 4169 attribTypes(tree.bounds, env); 4170 tree.type = result = checkIntersection(tree, tree.bounds); 4171 } 4172 4173 public void visitTypeParameter(JCTypeParameter tree) { 4174 TypeVar typeVar = (TypeVar) tree.type; 4175 4176 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4177 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4178 } 4179 4180 if (!typeVar.bound.isErroneous()) { 4181 //fixup type-parameter bound computed in 'attribTypeVariables' 4182 typeVar.bound = checkIntersection(tree, tree.bounds); 4183 } 4184 } 4185 4186 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4187 Set<Type> boundSet = new HashSet<>(); 4188 if (bounds.nonEmpty()) { 4189 // accept class or interface or typevar as first bound. 4190 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4191 boundSet.add(types.erasure(bounds.head.type)); 4192 if (bounds.head.type.isErroneous()) { 4193 return bounds.head.type; 4194 } 4195 else if (bounds.head.type.hasTag(TYPEVAR)) { 4196 // if first bound was a typevar, do not accept further bounds. 4197 if (bounds.tail.nonEmpty()) { 4198 log.error(bounds.tail.head.pos(), 4199 "type.var.may.not.be.followed.by.other.bounds"); 4200 return bounds.head.type; 4201 } 4202 } else { 4203 // if first bound was a class or interface, accept only interfaces 4204 // as further bounds. 4205 for (JCExpression bound : bounds.tail) { 4206 bound.type = checkBase(bound.type, bound, env, false, true, false); 4207 if (bound.type.isErroneous()) { 4208 bounds = List.of(bound); 4209 } 4210 else if (bound.type.hasTag(CLASS)) { 4211 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4212 } 4213 } 4214 } 4215 } 4216 4217 if (bounds.length() == 0) { 4218 return syms.objectType; 4219 } else if (bounds.length() == 1) { 4220 return bounds.head.type; 4221 } else { 4222 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4223 // ... the variable's bound is a class type flagged COMPOUND 4224 // (see comment for TypeVar.bound). 4225 // In this case, generate a class tree that represents the 4226 // bound class, ... 4227 JCExpression extending; 4228 List<JCExpression> implementing; 4229 if (!bounds.head.type.isInterface()) { 4230 extending = bounds.head; 4231 implementing = bounds.tail; 4232 } else { 4233 extending = null; 4234 implementing = bounds; 4235 } 4236 JCClassDecl cd = make.at(tree).ClassDef( 4237 make.Modifiers(PUBLIC | ABSTRACT), 4238 names.empty, List.nil(), 4239 extending, implementing, List.nil()); 4240 4241 ClassSymbol c = (ClassSymbol)owntype.tsym; 4242 Assert.check((c.flags() & COMPOUND) != 0); 4243 cd.sym = c; 4244 c.sourcefile = env.toplevel.sourcefile; 4245 4246 // ... and attribute the bound class 4247 c.flags_field |= UNATTRIBUTED; 4248 Env<AttrContext> cenv = enter.classEnv(cd, env); 4249 typeEnvs.put(c, cenv); 4250 attribClass(c); 4251 return owntype; 4252 } 4253 } 4254 4255 public void visitWildcard(JCWildcard tree) { 4256 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4257 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4258 ? syms.objectType 4259 : attribType(tree.inner, env); 4260 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4261 tree.kind.kind, 4262 syms.boundClass), 4263 KindSelector.TYP, resultInfo); 4264 } 4265 4266 public void visitAnnotation(JCAnnotation tree) { 4267 Assert.error("should be handled in annotate"); 4268 } 4269 4270 public void visitAnnotatedType(JCAnnotatedType tree) { 4271 attribAnnotationTypes(tree.annotations, env); 4272 Type underlyingType = attribType(tree.underlyingType, env); 4273 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4274 4275 if (!env.info.isNewClass) 4276 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4277 result = tree.type = annotatedType; 4278 } 4279 4280 public void visitErroneous(JCErroneous tree) { 4281 if (tree.errs != null) 4282 for (JCTree err : tree.errs) 4283 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4284 result = tree.type = syms.errType; 4285 } 4286 4287 /** Default visitor method for all other trees. 4288 */ 4289 public void visitTree(JCTree tree) { 4290 throw new AssertionError(); 4291 } 4292 4293 /** 4294 * Attribute an env for either a top level tree or class or module declaration. 4295 */ 4296 public void attrib(Env<AttrContext> env) { 4297 switch (env.tree.getTag()) { 4298 case MODULEDEF: 4299 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4300 break; 4301 case TOPLEVEL: 4302 attribTopLevel(env); 4303 break; 4304 case PACKAGEDEF: 4305 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge); 4306 break; 4307 default: 4308 attribClass(env.tree.pos(), env.enclClass.sym); 4309 } 4310 } 4311 4312 /** 4313 * Attribute a top level tree. These trees are encountered when the 4314 * package declaration has annotations. 4315 */ 4316 public void attribTopLevel(Env<AttrContext> env) { 4317 JCCompilationUnit toplevel = env.toplevel; 4318 try { 4319 annotate.flush(); 4320 } catch (CompletionFailure ex) { 4321 chk.completionError(toplevel.pos(), ex); 4322 } 4323 } 4324 4325 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) { 4326 try { 4327 annotate.flush(); 4328 attribPackage(p); 4329 } catch (CompletionFailure ex) { 4330 chk.completionError(pos, ex); 4331 } 4332 } 4333 4334 void attribPackage(PackageSymbol p) { 4335 Env<AttrContext> env = typeEnvs.get(p); 4336 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p); 4337 } 4338 4339 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4340 try { 4341 annotate.flush(); 4342 attribModule(m); 4343 } catch (CompletionFailure ex) { 4344 chk.completionError(pos, ex); 4345 } 4346 } 4347 4348 void attribModule(ModuleSymbol m) { 4349 // Get environment current at the point of module definition. 4350 Env<AttrContext> env = enter.typeEnvs.get(m); 4351 attribStat(env.tree, env); 4352 } 4353 4354 /** Main method: attribute class definition associated with given class symbol. 4355 * reporting completion failures at the given position. 4356 * @param pos The source position at which completion errors are to be 4357 * reported. 4358 * @param c The class symbol whose definition will be attributed. 4359 */ 4360 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4361 try { 4362 annotate.flush(); 4363 attribClass(c); 4364 } catch (CompletionFailure ex) { 4365 chk.completionError(pos, ex); 4366 } 4367 } 4368 4369 /** Attribute class definition associated with given class symbol. 4370 * @param c The class symbol whose definition will be attributed. 4371 */ 4372 void attribClass(ClassSymbol c) throws CompletionFailure { 4373 if (c.type.hasTag(ERROR)) return; 4374 4375 // Check for cycles in the inheritance graph, which can arise from 4376 // ill-formed class files. 4377 chk.checkNonCyclic(null, c.type); 4378 4379 Type st = types.supertype(c.type); 4380 if ((c.flags_field & Flags.COMPOUND) == 0) { 4381 // First, attribute superclass. 4382 if (st.hasTag(CLASS)) 4383 attribClass((ClassSymbol)st.tsym); 4384 4385 // Next attribute owner, if it is a class. 4386 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4387 attribClass((ClassSymbol)c.owner); 4388 } 4389 4390 // The previous operations might have attributed the current class 4391 // if there was a cycle. So we test first whether the class is still 4392 // UNATTRIBUTED. 4393 if ((c.flags_field & UNATTRIBUTED) != 0) { 4394 c.flags_field &= ~UNATTRIBUTED; 4395 4396 // Get environment current at the point of class definition. 4397 Env<AttrContext> env = typeEnvs.get(c); 4398 4399 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4400 // because the annotations were not available at the time the env was created. Therefore, 4401 // we look up the environment chain for the first enclosing environment for which the 4402 // lint value is set. Typically, this is the parent env, but might be further if there 4403 // are any envs created as a result of TypeParameter nodes. 4404 Env<AttrContext> lintEnv = env; 4405 while (lintEnv.info.lint == null) 4406 lintEnv = lintEnv.next; 4407 4408 // Having found the enclosing lint value, we can initialize the lint value for this class 4409 env.info.lint = lintEnv.info.lint.augment(c); 4410 4411 Lint prevLint = chk.setLint(env.info.lint); 4412 JavaFileObject prev = log.useSource(c.sourcefile); 4413 ResultInfo prevReturnRes = env.info.returnResult; 4414 4415 try { 4416 deferredLintHandler.flush(env.tree); 4417 env.info.returnResult = null; 4418 // java.lang.Enum may not be subclassed by a non-enum 4419 if (st.tsym == syms.enumSym && 4420 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4421 log.error(env.tree.pos(), "enum.no.subclassing"); 4422 4423 // Enums may not be extended by source-level classes 4424 if (st.tsym != null && 4425 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4426 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4427 log.error(env.tree.pos(), "enum.types.not.extensible"); 4428 } 4429 4430 if (isSerializable(c.type)) { 4431 env.info.isSerializable = true; 4432 } 4433 4434 attribClassBody(env, c); 4435 4436 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4437 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4438 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4439 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree); 4440 } finally { 4441 env.info.returnResult = prevReturnRes; 4442 log.useSource(prev); 4443 chk.setLint(prevLint); 4444 } 4445 4446 } 4447 } 4448 4449 public void visitImport(JCImport tree) { 4450 // nothing to do 4451 } 4452 4453 public void visitModuleDef(JCModuleDecl tree) { 4454 tree.sym.completeUsesProvides(); 4455 ModuleSymbol msym = tree.sym; 4456 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym); 4457 Lint prevLint = chk.setLint(lint); 4458 chk.checkModuleName(tree); 4459 chk.checkDeprecatedAnnotation(tree, msym); 4460 4461 try { 4462 deferredLintHandler.flush(tree.pos()); 4463 } finally { 4464 chk.setLint(prevLint); 4465 } 4466 } 4467 4468 /** Finish the attribution of a class. */ 4469 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4470 JCClassDecl tree = (JCClassDecl)env.tree; 4471 Assert.check(c == tree.sym); 4472 4473 // Validate type parameters, supertype and interfaces. 4474 attribStats(tree.typarams, env); 4475 if (!c.isAnonymous()) { 4476 //already checked if anonymous 4477 chk.validate(tree.typarams, env); 4478 chk.validate(tree.extending, env); 4479 chk.validate(tree.implementing, env); 4480 } 4481 4482 c.markAbstractIfNeeded(types); 4483 4484 // If this is a non-abstract class, check that it has no abstract 4485 // methods or unimplemented methods of an implemented interface. 4486 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4487 chk.checkAllDefined(tree.pos(), c); 4488 } 4489 4490 if ((c.flags() & ANNOTATION) != 0) { 4491 if (tree.implementing.nonEmpty()) 4492 log.error(tree.implementing.head.pos(), 4493 "cant.extend.intf.annotation"); 4494 if (tree.typarams.nonEmpty()) 4495 log.error(tree.typarams.head.pos(), 4496 "intf.annotation.cant.have.type.params"); 4497 4498 // If this annotation type has a @Repeatable, validate 4499 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4500 // If this annotation type has a @Repeatable, validate 4501 if (repeatable != null) { 4502 // get diagnostic position for error reporting 4503 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4504 Assert.checkNonNull(cbPos); 4505 4506 chk.validateRepeatable(c, repeatable, cbPos); 4507 } 4508 } else { 4509 // Check that all extended classes and interfaces 4510 // are compatible (i.e. no two define methods with same arguments 4511 // yet different return types). (JLS 8.4.6.3) 4512 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4513 if (allowDefaultMethods) { 4514 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4515 } 4516 } 4517 4518 // Check that class does not import the same parameterized interface 4519 // with two different argument lists. 4520 chk.checkClassBounds(tree.pos(), c.type); 4521 4522 tree.type = c.type; 4523 4524 for (List<JCTypeParameter> l = tree.typarams; 4525 l.nonEmpty(); l = l.tail) { 4526 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4527 } 4528 4529 // Check that a generic class doesn't extend Throwable 4530 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4531 log.error(tree.extending.pos(), "generic.throwable"); 4532 4533 // Check that all methods which implement some 4534 // method conform to the method they implement. 4535 chk.checkImplementations(tree); 4536 4537 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4538 checkAutoCloseable(tree.pos(), env, c.type); 4539 4540 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4541 // Attribute declaration 4542 attribStat(l.head, env); 4543 // Check that declarations in inner classes are not static (JLS 8.1.2) 4544 // Make an exception for static constants. 4545 if (c.owner.kind != PCK && 4546 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4547 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4548 Symbol sym = null; 4549 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4550 if (sym == null || 4551 sym.kind != VAR || 4552 ((VarSymbol) sym).getConstValue() == null) 4553 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4554 } 4555 } 4556 4557 // Check for cycles among non-initial constructors. 4558 chk.checkCyclicConstructors(tree); 4559 4560 // Check for cycles among annotation elements. 4561 chk.checkNonCyclicElements(tree); 4562 4563 // Check for proper use of serialVersionUID 4564 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4565 && isSerializable(c.type) 4566 && (c.flags() & Flags.ENUM) == 0 4567 && !c.isAnonymous() 4568 && checkForSerial(c)) { 4569 checkSerialVersionUID(tree, c); 4570 } 4571 if (allowTypeAnnos) { 4572 // Correctly organize the postions of the type annotations 4573 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4574 4575 // Check type annotations applicability rules 4576 validateTypeAnnotations(tree, false); 4577 } 4578 } 4579 // where 4580 boolean checkForSerial(ClassSymbol c) { 4581 if ((c.flags() & ABSTRACT) == 0) { 4582 return true; 4583 } else { 4584 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4585 } 4586 } 4587 4588 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = s -> 4589 s.kind == MTH && (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4590 4591 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4592 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4593 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4594 if (types.isSameType(al.head.annotationType.type, t)) 4595 return al.head.pos(); 4596 } 4597 4598 return null; 4599 } 4600 4601 /** check if a type is a subtype of Serializable, if that is available. */ 4602 boolean isSerializable(Type t) { 4603 try { 4604 syms.serializableType.complete(); 4605 } 4606 catch (CompletionFailure e) { 4607 return false; 4608 } 4609 return types.isSubtype(t, syms.serializableType); 4610 } 4611 4612 /** Check that an appropriate serialVersionUID member is defined. */ 4613 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4614 4615 // check for presence of serialVersionUID 4616 VarSymbol svuid = null; 4617 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4618 if (sym.kind == VAR) { 4619 svuid = (VarSymbol)sym; 4620 break; 4621 } 4622 } 4623 4624 if (svuid == null) { 4625 log.warning(LintCategory.SERIAL, 4626 tree.pos(), "missing.SVUID", c); 4627 return; 4628 } 4629 4630 // check that it is static final 4631 if ((svuid.flags() & (STATIC | FINAL)) != 4632 (STATIC | FINAL)) 4633 log.warning(LintCategory.SERIAL, 4634 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4635 4636 // check that it is long 4637 else if (!svuid.type.hasTag(LONG)) 4638 log.warning(LintCategory.SERIAL, 4639 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4640 4641 // check constant 4642 else if (svuid.getConstValue() == null) 4643 log.warning(LintCategory.SERIAL, 4644 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4645 } 4646 4647 private Type capture(Type type) { 4648 return types.capture(type); 4649 } 4650 4651 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4652 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4653 } 4654 //where 4655 private final class TypeAnnotationsValidator extends TreeScanner { 4656 4657 private final boolean sigOnly; 4658 public TypeAnnotationsValidator(boolean sigOnly) { 4659 this.sigOnly = sigOnly; 4660 } 4661 4662 public void visitAnnotation(JCAnnotation tree) { 4663 chk.validateTypeAnnotation(tree, false); 4664 super.visitAnnotation(tree); 4665 } 4666 public void visitAnnotatedType(JCAnnotatedType tree) { 4667 if (!tree.underlyingType.type.isErroneous()) { 4668 super.visitAnnotatedType(tree); 4669 } 4670 } 4671 public void visitTypeParameter(JCTypeParameter tree) { 4672 chk.validateTypeAnnotations(tree.annotations, true); 4673 scan(tree.bounds); 4674 // Don't call super. 4675 // This is needed because above we call validateTypeAnnotation with 4676 // false, which would forbid annotations on type parameters. 4677 // super.visitTypeParameter(tree); 4678 } 4679 public void visitMethodDef(JCMethodDecl tree) { 4680 if (tree.recvparam != null && 4681 !tree.recvparam.vartype.type.isErroneous()) { 4682 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4683 tree.recvparam.vartype.type.tsym); 4684 } 4685 if (tree.restype != null && tree.restype.type != null) { 4686 validateAnnotatedType(tree.restype, tree.restype.type); 4687 } 4688 if (sigOnly) { 4689 scan(tree.mods); 4690 scan(tree.restype); 4691 scan(tree.typarams); 4692 scan(tree.recvparam); 4693 scan(tree.params); 4694 scan(tree.thrown); 4695 } else { 4696 scan(tree.defaultValue); 4697 scan(tree.body); 4698 } 4699 } 4700 public void visitVarDef(final JCVariableDecl tree) { 4701 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4702 if (tree.sym != null && tree.sym.type != null) 4703 validateAnnotatedType(tree.vartype, tree.sym.type); 4704 scan(tree.mods); 4705 scan(tree.vartype); 4706 if (!sigOnly) { 4707 scan(tree.init); 4708 } 4709 } 4710 public void visitTypeCast(JCTypeCast tree) { 4711 if (tree.clazz != null && tree.clazz.type != null) 4712 validateAnnotatedType(tree.clazz, tree.clazz.type); 4713 super.visitTypeCast(tree); 4714 } 4715 public void visitTypeTest(JCInstanceOf tree) { 4716 if (tree.clazz != null && tree.clazz.type != null) 4717 validateAnnotatedType(tree.clazz, tree.clazz.type); 4718 super.visitTypeTest(tree); 4719 } 4720 public void visitNewClass(JCNewClass tree) { 4721 if (tree.clazz != null && tree.clazz.type != null) { 4722 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4723 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4724 tree.clazz.type.tsym); 4725 } 4726 if (tree.def != null) { 4727 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4728 } 4729 4730 validateAnnotatedType(tree.clazz, tree.clazz.type); 4731 } 4732 super.visitNewClass(tree); 4733 } 4734 public void visitNewArray(JCNewArray tree) { 4735 if (tree.elemtype != null && tree.elemtype.type != null) { 4736 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4737 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4738 tree.elemtype.type.tsym); 4739 } 4740 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4741 } 4742 super.visitNewArray(tree); 4743 } 4744 public void visitClassDef(JCClassDecl tree) { 4745 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4746 if (sigOnly) { 4747 scan(tree.mods); 4748 scan(tree.typarams); 4749 scan(tree.extending); 4750 scan(tree.implementing); 4751 } 4752 for (JCTree member : tree.defs) { 4753 if (member.hasTag(Tag.CLASSDEF)) { 4754 continue; 4755 } 4756 scan(member); 4757 } 4758 } 4759 public void visitBlock(JCBlock tree) { 4760 if (!sigOnly) { 4761 scan(tree.stats); 4762 } 4763 } 4764 4765 /* I would want to model this after 4766 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4767 * and override visitSelect and visitTypeApply. 4768 * However, we only set the annotated type in the top-level type 4769 * of the symbol. 4770 * Therefore, we need to override each individual location where a type 4771 * can occur. 4772 */ 4773 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4774 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4775 4776 if (type.isPrimitiveOrVoid()) { 4777 return; 4778 } 4779 4780 JCTree enclTr = errtree; 4781 Type enclTy = type; 4782 4783 boolean repeat = true; 4784 while (repeat) { 4785 if (enclTr.hasTag(TYPEAPPLY)) { 4786 List<Type> tyargs = enclTy.getTypeArguments(); 4787 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4788 if (trargs.length() > 0) { 4789 // Nothing to do for diamonds 4790 if (tyargs.length() == trargs.length()) { 4791 for (int i = 0; i < tyargs.length(); ++i) { 4792 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4793 } 4794 } 4795 // If the lengths don't match, it's either a diamond 4796 // or some nested type that redundantly provides 4797 // type arguments in the tree. 4798 } 4799 4800 // Look at the clazz part of a generic type 4801 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4802 } 4803 4804 if (enclTr.hasTag(SELECT)) { 4805 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4806 if (enclTy != null && 4807 !enclTy.hasTag(NONE)) { 4808 enclTy = enclTy.getEnclosingType(); 4809 } 4810 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4811 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4812 if (enclTy == null || enclTy.hasTag(NONE)) { 4813 if (at.getAnnotations().size() == 1) { 4814 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4815 } else { 4816 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4817 for (JCAnnotation an : at.getAnnotations()) { 4818 comps.add(an.attribute); 4819 } 4820 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4821 } 4822 repeat = false; 4823 } 4824 enclTr = at.underlyingType; 4825 // enclTy doesn't need to be changed 4826 } else if (enclTr.hasTag(IDENT)) { 4827 repeat = false; 4828 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4829 JCWildcard wc = (JCWildcard) enclTr; 4830 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4831 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4832 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4833 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4834 } else { 4835 // Nothing to do for UNBOUND 4836 } 4837 repeat = false; 4838 } else if (enclTr.hasTag(TYPEARRAY)) { 4839 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4840 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4841 repeat = false; 4842 } else if (enclTr.hasTag(TYPEUNION)) { 4843 JCTypeUnion ut = (JCTypeUnion) enclTr; 4844 for (JCTree t : ut.getTypeAlternatives()) { 4845 validateAnnotatedType(t, t.type); 4846 } 4847 repeat = false; 4848 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4849 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4850 for (JCTree t : it.getBounds()) { 4851 validateAnnotatedType(t, t.type); 4852 } 4853 repeat = false; 4854 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4855 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4856 repeat = false; 4857 } else { 4858 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4859 " within: "+ errtree + " with kind: " + errtree.getKind()); 4860 } 4861 } 4862 } 4863 4864 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4865 Symbol sym) { 4866 // Ensure that no declaration annotations are present. 4867 // Note that a tree type might be an AnnotatedType with 4868 // empty annotations, if only declaration annotations were given. 4869 // This method will raise an error for such a type. 4870 for (JCAnnotation ai : annotations) { 4871 if (!ai.type.isErroneous() && 4872 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4873 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4874 } 4875 } 4876 } 4877 } 4878 4879 // <editor-fold desc="post-attribution visitor"> 4880 4881 /** 4882 * Handle missing types/symbols in an AST. This routine is useful when 4883 * the compiler has encountered some errors (which might have ended up 4884 * terminating attribution abruptly); if the compiler is used in fail-over 4885 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4886 * prevents NPE to be progagated during subsequent compilation steps. 4887 */ 4888 public void postAttr(JCTree tree) { 4889 new PostAttrAnalyzer().scan(tree); 4890 } 4891 4892 class PostAttrAnalyzer extends TreeScanner { 4893 4894 private void initTypeIfNeeded(JCTree that) { 4895 if (that.type == null) { 4896 if (that.hasTag(METHODDEF)) { 4897 that.type = dummyMethodType((JCMethodDecl)that); 4898 } else { 4899 that.type = syms.unknownType; 4900 } 4901 } 4902 } 4903 4904 /* Construct a dummy method type. If we have a method declaration, 4905 * and the declared return type is void, then use that return type 4906 * instead of UNKNOWN to avoid spurious error messages in lambda 4907 * bodies (see:JDK-8041704). 4908 */ 4909 private Type dummyMethodType(JCMethodDecl md) { 4910 Type restype = syms.unknownType; 4911 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4912 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4913 if (prim.typetag == VOID) 4914 restype = syms.voidType; 4915 } 4916 return new MethodType(List.nil(), restype, 4917 List.nil(), syms.methodClass); 4918 } 4919 private Type dummyMethodType() { 4920 return dummyMethodType(null); 4921 } 4922 4923 @Override 4924 public void scan(JCTree tree) { 4925 if (tree == null) return; 4926 if (tree instanceof JCExpression) { 4927 initTypeIfNeeded(tree); 4928 } 4929 super.scan(tree); 4930 } 4931 4932 @Override 4933 public void visitIdent(JCIdent that) { 4934 if (that.sym == null) { 4935 that.sym = syms.unknownSymbol; 4936 } 4937 } 4938 4939 @Override 4940 public void visitSelect(JCFieldAccess that) { 4941 if (that.sym == null) { 4942 that.sym = syms.unknownSymbol; 4943 } 4944 super.visitSelect(that); 4945 } 4946 4947 @Override 4948 public void visitClassDef(JCClassDecl that) { 4949 initTypeIfNeeded(that); 4950 if (that.sym == null) { 4951 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4952 } 4953 super.visitClassDef(that); 4954 } 4955 4956 @Override 4957 public void visitMethodDef(JCMethodDecl that) { 4958 initTypeIfNeeded(that); 4959 if (that.sym == null) { 4960 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4961 } 4962 super.visitMethodDef(that); 4963 } 4964 4965 @Override 4966 public void visitVarDef(JCVariableDecl that) { 4967 initTypeIfNeeded(that); 4968 if (that.sym == null) { 4969 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4970 that.sym.adr = 0; 4971 } 4972 if (that.vartype == null) { 4973 that.vartype = make.Erroneous(); 4974 } 4975 super.visitVarDef(that); 4976 } 4977 4978 @Override 4979 public void visitNewClass(JCNewClass that) { 4980 if (that.constructor == null) { 4981 that.constructor = new MethodSymbol(0, names.init, 4982 dummyMethodType(), syms.noSymbol); 4983 } 4984 if (that.constructorType == null) { 4985 that.constructorType = syms.unknownType; 4986 } 4987 super.visitNewClass(that); 4988 } 4989 4990 @Override 4991 public void visitAssignop(JCAssignOp that) { 4992 if (that.operator == null) { 4993 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4994 -1, syms.noSymbol); 4995 } 4996 super.visitAssignop(that); 4997 } 4998 4999 @Override 5000 public void visitBinary(JCBinary that) { 5001 if (that.operator == null) { 5002 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5003 -1, syms.noSymbol); 5004 } 5005 super.visitBinary(that); 5006 } 5007 5008 @Override 5009 public void visitUnary(JCUnary that) { 5010 if (that.operator == null) { 5011 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5012 -1, syms.noSymbol); 5013 } 5014 super.visitUnary(that); 5015 } 5016 5017 @Override 5018 public void visitLambda(JCLambda that) { 5019 super.visitLambda(that); 5020 if (that.targets == null) { 5021 that.targets = List.nil(); 5022 } 5023 } 5024 5025 @Override 5026 public void visitReference(JCMemberReference that) { 5027 super.visitReference(that); 5028 if (that.sym == null) { 5029 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 5030 syms.noSymbol); 5031 } 5032 if (that.targets == null) { 5033 that.targets = List.nil(); 5034 } 5035 } 5036 } 5037 // </editor-fold> 5038 5039 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 5040 new TreeScanner() { 5041 Symbol packge = pkg; 5042 @Override 5043 public void visitIdent(JCIdent that) { 5044 that.sym = packge; 5045 } 5046 5047 @Override 5048 public void visitSelect(JCFieldAccess that) { 5049 that.sym = packge; 5050 packge = packge.owner; 5051 super.visitSelect(that); 5052 } 5053 }.scan(pid); 5054 } 5055 5056} 5057