Attr.java revision 3347:8214105024db
1/* 2 * Copyright (c) 1999, 2016, 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.*; 73 74/** This is the main context-dependent analysis phase in GJC. It 75 * encompasses name resolution, type checking and constant folding as 76 * subtasks. Some subtasks involve auxiliary classes. 77 * @see Check 78 * @see Resolve 79 * @see ConstFold 80 * @see Infer 81 * 82 * <p><b>This is NOT part of any supported API. 83 * If you write code that depends on this, you do so at your own risk. 84 * This code and its internal interfaces are subject to change or 85 * deletion without notice.</b> 86 */ 87public class Attr extends JCTree.Visitor { 88 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 89 90 final Names names; 91 final Log log; 92 final Symtab syms; 93 final Resolve rs; 94 final Operators operators; 95 final Infer infer; 96 final Analyzer analyzer; 97 final DeferredAttr deferredAttr; 98 final Check chk; 99 final Flow flow; 100 final MemberEnter memberEnter; 101 final TypeEnter typeEnter; 102 final TreeMaker make; 103 final ConstFold cfolder; 104 final Enter enter; 105 final Target target; 106 final Types types; 107 final JCDiagnostic.Factory diags; 108 final TypeAnnotations typeAnnotations; 109 final DeferredLintHandler deferredLintHandler; 110 final TypeEnvs typeEnvs; 111 final Dependencies dependencies; 112 final Annotate annotate; 113 final ArgumentAttr argumentAttr; 114 115 public static Attr instance(Context context) { 116 Attr instance = context.get(attrKey); 117 if (instance == null) 118 instance = new Attr(context); 119 return instance; 120 } 121 122 protected Attr(Context context) { 123 context.put(attrKey, this); 124 125 names = Names.instance(context); 126 log = Log.instance(context); 127 syms = Symtab.instance(context); 128 rs = Resolve.instance(context); 129 operators = Operators.instance(context); 130 chk = Check.instance(context); 131 flow = Flow.instance(context); 132 memberEnter = MemberEnter.instance(context); 133 typeEnter = TypeEnter.instance(context); 134 make = TreeMaker.instance(context); 135 enter = Enter.instance(context); 136 infer = Infer.instance(context); 137 analyzer = Analyzer.instance(context); 138 deferredAttr = DeferredAttr.instance(context); 139 cfolder = ConstFold.instance(context); 140 target = Target.instance(context); 141 types = Types.instance(context); 142 diags = JCDiagnostic.Factory.instance(context); 143 annotate = Annotate.instance(context); 144 typeAnnotations = TypeAnnotations.instance(context); 145 deferredLintHandler = DeferredLintHandler.instance(context); 146 typeEnvs = TypeEnvs.instance(context); 147 dependencies = Dependencies.instance(context); 148 argumentAttr = ArgumentAttr.instance(context); 149 150 Options options = Options.instance(context); 151 152 Source source = Source.instance(context); 153 allowStringsInSwitch = source.allowStringsInSwitch(); 154 allowPoly = source.allowPoly(); 155 allowTypeAnnos = source.allowTypeAnnotations(); 156 allowLambda = source.allowLambda(); 157 allowDefaultMethods = source.allowDefaultMethods(); 158 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 159 sourceName = source.name; 160 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 161 162 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 163 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 164 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 165 methodAttrInfo = new MethodAttrInfo(); 166 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 167 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 168 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 169 } 170 171 /** Switch: support target-typing inference 172 */ 173 boolean allowPoly; 174 175 /** Switch: support type annotations. 176 */ 177 boolean allowTypeAnnos; 178 179 /** Switch: support lambda expressions ? 180 */ 181 boolean allowLambda; 182 183 /** Switch: support default methods ? 184 */ 185 boolean allowDefaultMethods; 186 187 /** Switch: static interface methods enabled? 188 */ 189 boolean allowStaticInterfaceMethods; 190 191 /** 192 * Switch: warn about use of variable before declaration? 193 * RFE: 6425594 194 */ 195 boolean useBeforeDeclarationWarning; 196 197 /** 198 * Switch: allow strings in switch? 199 */ 200 boolean allowStringsInSwitch; 201 202 /** 203 * Switch: name of source level; used for error reporting. 204 */ 205 String sourceName; 206 207 /** Check kind and type of given tree against protokind and prototype. 208 * If check succeeds, store type in tree and return it. 209 * If check fails, store errType in tree and return it. 210 * No checks are performed if the prototype is a method type. 211 * It is not necessary in this case since we know that kind and type 212 * are correct. 213 * 214 * @param tree The tree whose kind and type is checked 215 * @param found The computed type of the tree 216 * @param ownkind The computed kind of the tree 217 * @param resultInfo The expected result of the tree 218 */ 219 Type check(final JCTree tree, 220 final Type found, 221 final KindSelector ownkind, 222 final ResultInfo resultInfo) { 223 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 224 Type owntype; 225 boolean shouldCheck = !found.hasTag(ERROR) && 226 !resultInfo.pt.hasTag(METHOD) && 227 !resultInfo.pt.hasTag(FORALL); 228 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 229 log.error(tree.pos(), "unexpected.type", 230 resultInfo.pkind.kindNames(), 231 ownkind.kindNames()); 232 owntype = types.createErrorType(found); 233 } else if (allowPoly && inferenceContext.free(found)) { 234 //delay the check if there are inference variables in the found type 235 //this means we are dealing with a partially inferred poly expression 236 owntype = shouldCheck ? resultInfo.pt : found; 237 if (resultInfo.checkMode.installPostInferenceHook()) { 238 inferenceContext.addFreeTypeListener(List.of(found), 239 instantiatedContext -> { 240 ResultInfo pendingResult = 241 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 242 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 243 }); 244 } 245 } else { 246 owntype = shouldCheck ? 247 resultInfo.check(tree, found) : 248 found; 249 } 250 if (resultInfo.checkMode.updateTreeType()) { 251 tree.type = owntype; 252 } 253 return owntype; 254 } 255 256 /** Is given blank final variable assignable, i.e. in a scope where it 257 * may be assigned to even though it is final? 258 * @param v The blank final variable. 259 * @param env The current environment. 260 */ 261 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 262 Symbol owner = env.info.scope.owner; 263 // owner refers to the innermost variable, method or 264 // initializer block declaration at this point. 265 return 266 v.owner == owner 267 || 268 ((owner.name == names.init || // i.e. we are in a constructor 269 owner.kind == VAR || // i.e. we are in a variable initializer 270 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 271 && 272 v.owner == owner.owner 273 && 274 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 275 } 276 277 /** Check that variable can be assigned to. 278 * @param pos The current source code position. 279 * @param v The assigned variable 280 * @param base If the variable is referred to in a Select, the part 281 * to the left of the `.', null otherwise. 282 * @param env The current environment. 283 */ 284 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 285 if (v.name == names._this) { 286 log.error(pos, Errors.CantAssignValToThis); 287 } else if ((v.flags() & FINAL) != 0 && 288 ((v.flags() & HASINIT) != 0 289 || 290 !((base == null || 291 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 292 isAssignableAsBlankFinal(v, env)))) { 293 if (v.isResourceVariable()) { //TWR resource 294 log.error(pos, "try.resource.may.not.be.assigned", v); 295 } else { 296 log.error(pos, "cant.assign.val.to.final.var", v); 297 } 298 } 299 } 300 301 /** Does tree represent a static reference to an identifier? 302 * It is assumed that tree is either a SELECT or an IDENT. 303 * We have to weed out selects from non-type names here. 304 * @param tree The candidate tree. 305 */ 306 boolean isStaticReference(JCTree tree) { 307 if (tree.hasTag(SELECT)) { 308 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 309 if (lsym == null || lsym.kind != TYP) { 310 return false; 311 } 312 } 313 return true; 314 } 315 316 /** Is this symbol a type? 317 */ 318 static boolean isType(Symbol sym) { 319 return sym != null && sym.kind == TYP; 320 } 321 322 /** The current `this' symbol. 323 * @param env The current environment. 324 */ 325 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 326 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 327 } 328 329 /** Attribute a parsed identifier. 330 * @param tree Parsed identifier name 331 * @param topLevel The toplevel to use 332 */ 333 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 334 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 335 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 336 syms.errSymbol.name, 337 null, null, null, null); 338 localEnv.enclClass.sym = syms.errSymbol; 339 return attribIdent(tree, localEnv); 340 } 341 342 /** Attribute a parsed identifier. 343 * @param tree Parsed identifier name 344 * @param env The env to use 345 */ 346 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 347 return tree.accept(identAttributer, env); 348 } 349 // where 350 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 351 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 352 @Override @DefinedBy(Api.COMPILER_TREE) 353 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 354 Symbol site = visit(node.getExpression(), env); 355 if (site.kind == ERR || site.kind == ABSENT_TYP) 356 return site; 357 Name name = (Name)node.getIdentifier(); 358 if (site.kind == PCK) { 359 env.toplevel.packge = (PackageSymbol)site; 360 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 361 KindSelector.TYP_PCK); 362 } else { 363 env.enclClass.sym = (ClassSymbol)site; 364 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 365 } 366 } 367 368 @Override @DefinedBy(Api.COMPILER_TREE) 369 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 370 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 371 } 372 } 373 374 public Type coerce(Type etype, Type ttype) { 375 return cfolder.coerce(etype, ttype); 376 } 377 378 public Type attribType(JCTree node, TypeSymbol sym) { 379 Env<AttrContext> env = typeEnvs.get(sym); 380 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 381 return attribTree(node, localEnv, unknownTypeInfo); 382 } 383 384 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 385 // Attribute qualifying package or class. 386 JCFieldAccess s = (JCFieldAccess)tree.qualid; 387 return attribTree(s.selected, env, 388 new ResultInfo(tree.staticImport ? 389 KindSelector.TYP : KindSelector.TYP_PCK, 390 Type.noType)); 391 } 392 393 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 394 breakTree = tree; 395 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 396 try { 397 attribExpr(expr, env); 398 } catch (BreakAttr b) { 399 return b.env; 400 } catch (AssertionError ae) { 401 if (ae.getCause() instanceof BreakAttr) { 402 return ((BreakAttr)(ae.getCause())).env; 403 } else { 404 throw ae; 405 } 406 } finally { 407 breakTree = null; 408 log.useSource(prev); 409 } 410 return env; 411 } 412 413 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 414 breakTree = tree; 415 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 416 try { 417 attribStat(stmt, env); 418 } catch (BreakAttr b) { 419 return b.env; 420 } catch (AssertionError ae) { 421 if (ae.getCause() instanceof BreakAttr) { 422 return ((BreakAttr)(ae.getCause())).env; 423 } else { 424 throw ae; 425 } 426 } finally { 427 breakTree = null; 428 log.useSource(prev); 429 } 430 return env; 431 } 432 433 private JCTree breakTree = null; 434 435 private static class BreakAttr extends RuntimeException { 436 static final long serialVersionUID = -6924771130405446405L; 437 private Env<AttrContext> env; 438 private BreakAttr(Env<AttrContext> env) { 439 this.env = env; 440 } 441 } 442 443 /** 444 * Mode controlling behavior of Attr.Check 445 */ 446 enum CheckMode { 447 448 NORMAL, 449 450 NO_TREE_UPDATE { // Mode signalling 'fake check' - skip tree update 451 @Override 452 public boolean updateTreeType() { 453 return false; 454 } 455 }, 456 NO_INFERENCE_HOOK { // Mode signalling that caller will manage free types in tree decorations. 457 @Override 458 public boolean installPostInferenceHook() { 459 return false; 460 } 461 }; 462 463 public boolean updateTreeType() { 464 return true; 465 } 466 public boolean installPostInferenceHook() { 467 return true; 468 } 469 } 470 471 472 class ResultInfo { 473 final KindSelector pkind; 474 final Type pt; 475 final CheckContext checkContext; 476 final CheckMode checkMode; 477 478 ResultInfo(KindSelector pkind, Type pt) { 479 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 480 } 481 482 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 483 this(pkind, pt, chk.basicHandler, checkMode); 484 } 485 486 protected ResultInfo(KindSelector pkind, 487 Type pt, CheckContext checkContext) { 488 this(pkind, pt, checkContext, CheckMode.NORMAL); 489 } 490 491 protected ResultInfo(KindSelector pkind, 492 Type pt, CheckContext checkContext, CheckMode checkMode) { 493 this.pkind = pkind; 494 this.pt = pt; 495 this.checkContext = checkContext; 496 this.checkMode = checkMode; 497 } 498 499 protected void attr(JCTree tree, Env<AttrContext> env) { 500 tree.accept(Attr.this); 501 } 502 503 protected Type check(final DiagnosticPosition pos, final Type found) { 504 return chk.checkType(pos, found, pt, checkContext); 505 } 506 507 protected ResultInfo dup(Type newPt) { 508 return new ResultInfo(pkind, newPt, checkContext, checkMode); 509 } 510 511 protected ResultInfo dup(CheckContext newContext) { 512 return new ResultInfo(pkind, pt, newContext, checkMode); 513 } 514 515 protected ResultInfo dup(Type newPt, CheckContext newContext) { 516 return new ResultInfo(pkind, newPt, newContext, checkMode); 517 } 518 519 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 520 return new ResultInfo(pkind, newPt, newContext, newMode); 521 } 522 523 protected ResultInfo dup(CheckMode newMode) { 524 return new ResultInfo(pkind, pt, checkContext, newMode); 525 } 526 527 @Override 528 public String toString() { 529 if (pt != null) { 530 return pt.toString(); 531 } else { 532 return ""; 533 } 534 } 535 } 536 537 class MethodAttrInfo extends ResultInfo { 538 public MethodAttrInfo() { 539 this(chk.basicHandler); 540 } 541 542 public MethodAttrInfo(CheckContext checkContext) { 543 super(KindSelector.VAL, Infer.anyPoly, checkContext); 544 } 545 546 @Override 547 protected void attr(JCTree tree, Env<AttrContext> env) { 548 result = argumentAttr.attribArg(tree, env); 549 } 550 551 protected ResultInfo dup(Type newPt) { 552 throw new IllegalStateException(); 553 } 554 555 protected ResultInfo dup(CheckContext newContext) { 556 return new MethodAttrInfo(newContext); 557 } 558 559 protected ResultInfo dup(Type newPt, CheckContext newContext) { 560 throw new IllegalStateException(); 561 } 562 563 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 564 throw new IllegalStateException(); 565 } 566 567 protected ResultInfo dup(CheckMode newMode) { 568 throw new IllegalStateException(); 569 } 570 } 571 572 class RecoveryInfo extends ResultInfo { 573 574 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 575 super(KindSelector.VAL, Type.recoveryType, 576 new Check.NestedCheckContext(chk.basicHandler) { 577 @Override 578 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 579 return deferredAttrContext; 580 } 581 @Override 582 public boolean compatible(Type found, Type req, Warner warn) { 583 return true; 584 } 585 @Override 586 public void report(DiagnosticPosition pos, JCDiagnostic details) { 587 chk.basicHandler.report(pos, details); 588 } 589 }); 590 } 591 } 592 593 final ResultInfo statInfo; 594 final ResultInfo varAssignmentInfo; 595 final ResultInfo methodAttrInfo; 596 final ResultInfo unknownExprInfo; 597 final ResultInfo unknownTypeInfo; 598 final ResultInfo unknownTypeExprInfo; 599 final ResultInfo recoveryInfo; 600 601 Type pt() { 602 return resultInfo.pt; 603 } 604 605 KindSelector pkind() { 606 return resultInfo.pkind; 607 } 608 609/* ************************************************************************ 610 * Visitor methods 611 *************************************************************************/ 612 613 /** Visitor argument: the current environment. 614 */ 615 Env<AttrContext> env; 616 617 /** Visitor argument: the currently expected attribution result. 618 */ 619 ResultInfo resultInfo; 620 621 /** Visitor result: the computed type. 622 */ 623 Type result; 624 625 /** Visitor method: attribute a tree, catching any completion failure 626 * exceptions. Return the tree's type. 627 * 628 * @param tree The tree to be visited. 629 * @param env The environment visitor argument. 630 * @param resultInfo The result info visitor argument. 631 */ 632 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 633 Env<AttrContext> prevEnv = this.env; 634 ResultInfo prevResult = this.resultInfo; 635 try { 636 this.env = env; 637 this.resultInfo = resultInfo; 638 resultInfo.attr(tree, env); 639 if (tree == breakTree && 640 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 641 throw new BreakAttr(copyEnv(env)); 642 } 643 return result; 644 } catch (CompletionFailure ex) { 645 tree.type = syms.errType; 646 return chk.completionError(tree.pos(), ex); 647 } finally { 648 this.env = prevEnv; 649 this.resultInfo = prevResult; 650 } 651 } 652 653 Env<AttrContext> copyEnv(Env<AttrContext> env) { 654 Env<AttrContext> newEnv = 655 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 656 if (newEnv.outer != null) { 657 newEnv.outer = copyEnv(newEnv.outer); 658 } 659 return newEnv; 660 } 661 662 WriteableScope copyScope(WriteableScope sc) { 663 WriteableScope newScope = WriteableScope.create(sc.owner); 664 List<Symbol> elemsList = List.nil(); 665 for (Symbol sym : sc.getSymbols()) { 666 elemsList = elemsList.prepend(sym); 667 } 668 for (Symbol s : elemsList) { 669 newScope.enter(s); 670 } 671 return newScope; 672 } 673 674 /** Derived visitor method: attribute an expression tree. 675 */ 676 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 677 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 678 } 679 680 /** Derived visitor method: attribute an expression tree with 681 * no constraints on the computed type. 682 */ 683 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 684 return attribTree(tree, env, unknownExprInfo); 685 } 686 687 /** Derived visitor method: attribute a type tree. 688 */ 689 public Type attribType(JCTree tree, Env<AttrContext> env) { 690 Type result = attribType(tree, env, Type.noType); 691 return result; 692 } 693 694 /** Derived visitor method: attribute a type tree. 695 */ 696 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 697 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 698 return result; 699 } 700 701 /** Derived visitor method: attribute a statement or definition tree. 702 */ 703 public Type attribStat(JCTree tree, Env<AttrContext> env) { 704 Env<AttrContext> analyzeEnv = 705 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 706 try { 707 return attribTree(tree, env, statInfo); 708 } finally { 709 analyzer.analyzeIfNeeded(tree, analyzeEnv); 710 } 711 } 712 713 /** Attribute a list of expressions, returning a list of types. 714 */ 715 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 716 ListBuffer<Type> ts = new ListBuffer<>(); 717 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 718 ts.append(attribExpr(l.head, env, pt)); 719 return ts.toList(); 720 } 721 722 /** Attribute a list of statements, returning nothing. 723 */ 724 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 725 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 726 attribStat(l.head, env); 727 } 728 729 /** Attribute the arguments in a method call, returning the method kind. 730 */ 731 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 732 KindSelector kind = initialKind; 733 for (JCExpression arg : trees) { 734 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 735 if (argtype.hasTag(DEFERRED)) { 736 kind = KindSelector.of(KindSelector.POLY, kind); 737 } 738 argtypes.append(argtype); 739 } 740 return kind; 741 } 742 743 /** Attribute a type argument list, returning a list of types. 744 * Caller is responsible for calling checkRefTypes. 745 */ 746 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 747 ListBuffer<Type> argtypes = new ListBuffer<>(); 748 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 749 argtypes.append(attribType(l.head, env)); 750 return argtypes.toList(); 751 } 752 753 /** Attribute a type argument list, returning a list of types. 754 * Check that all the types are references. 755 */ 756 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 757 List<Type> types = attribAnyTypes(trees, env); 758 return chk.checkRefTypes(trees, types); 759 } 760 761 /** 762 * Attribute type variables (of generic classes or methods). 763 * Compound types are attributed later in attribBounds. 764 * @param typarams the type variables to enter 765 * @param env the current environment 766 */ 767 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 768 for (JCTypeParameter tvar : typarams) { 769 TypeVar a = (TypeVar)tvar.type; 770 a.tsym.flags_field |= UNATTRIBUTED; 771 a.bound = Type.noType; 772 if (!tvar.bounds.isEmpty()) { 773 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 774 for (JCExpression bound : tvar.bounds.tail) 775 bounds = bounds.prepend(attribType(bound, env)); 776 types.setBounds(a, bounds.reverse()); 777 } else { 778 // if no bounds are given, assume a single bound of 779 // java.lang.Object. 780 types.setBounds(a, List.of(syms.objectType)); 781 } 782 a.tsym.flags_field &= ~UNATTRIBUTED; 783 } 784 for (JCTypeParameter tvar : typarams) { 785 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 786 } 787 } 788 789 /** 790 * Attribute the type references in a list of annotations. 791 */ 792 void attribAnnotationTypes(List<JCAnnotation> annotations, 793 Env<AttrContext> env) { 794 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 795 JCAnnotation a = al.head; 796 attribType(a.annotationType, env); 797 } 798 } 799 800 /** 801 * Attribute a "lazy constant value". 802 * @param env The env for the const value 803 * @param variable The initializer for the const value 804 * @param type The expected type, or null 805 * @see VarSymbol#setLazyConstValue 806 */ 807 public Object attribLazyConstantValue(Env<AttrContext> env, 808 JCVariableDecl variable, 809 Type type) { 810 811 DiagnosticPosition prevLintPos 812 = deferredLintHandler.setPos(variable.pos()); 813 814 try { 815 Type itype = attribExpr(variable.init, env, type); 816 if (itype.constValue() != null) { 817 return coerce(itype, type).constValue(); 818 } else { 819 return null; 820 } 821 } finally { 822 deferredLintHandler.setPos(prevLintPos); 823 } 824 } 825 826 /** Attribute type reference in an `extends' or `implements' clause. 827 * Supertypes of anonymous inner classes are usually already attributed. 828 * 829 * @param tree The tree making up the type reference. 830 * @param env The environment current at the reference. 831 * @param classExpected true if only a class is expected here. 832 * @param interfaceExpected true if only an interface is expected here. 833 */ 834 Type attribBase(JCTree tree, 835 Env<AttrContext> env, 836 boolean classExpected, 837 boolean interfaceExpected, 838 boolean checkExtensible) { 839 Type t = tree.type != null ? 840 tree.type : 841 attribType(tree, env); 842 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 843 } 844 Type checkBase(Type t, 845 JCTree tree, 846 Env<AttrContext> env, 847 boolean classExpected, 848 boolean interfaceExpected, 849 boolean checkExtensible) { 850 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 851 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 852 if (t.tsym.isAnonymous()) { 853 log.error(pos, "cant.inherit.from.anon"); 854 return types.createErrorType(t); 855 } 856 if (t.isErroneous()) 857 return t; 858 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 859 // check that type variable is already visible 860 if (t.getUpperBound() == null) { 861 log.error(pos, "illegal.forward.ref"); 862 return types.createErrorType(t); 863 } 864 } else { 865 t = chk.checkClassType(pos, t, checkExtensible); 866 } 867 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 868 log.error(pos, "intf.expected.here"); 869 // return errType is necessary since otherwise there might 870 // be undetected cycles which cause attribution to loop 871 return types.createErrorType(t); 872 } else if (checkExtensible && 873 classExpected && 874 (t.tsym.flags() & INTERFACE) != 0) { 875 log.error(pos, "no.intf.expected.here"); 876 return types.createErrorType(t); 877 } 878 if (checkExtensible && 879 ((t.tsym.flags() & FINAL) != 0)) { 880 log.error(pos, 881 "cant.inherit.from.final", t.tsym); 882 } 883 chk.checkNonCyclic(pos, t); 884 return t; 885 } 886 887 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 888 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 889 id.type = env.info.scope.owner.enclClass().type; 890 id.sym = env.info.scope.owner.enclClass(); 891 return id.type; 892 } 893 894 public void visitClassDef(JCClassDecl tree) { 895 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 896 Optional.ofNullable(env.info.isSpeculative ? 897 argumentAttr.withLocalCacheContext() : null); 898 try { 899 // Local and anonymous classes have not been entered yet, so we need to 900 // do it now. 901 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 902 enter.classEnter(tree, env); 903 } else { 904 // If this class declaration is part of a class level annotation, 905 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 906 // order to simplify later steps and allow for sensible error 907 // messages. 908 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 909 enter.classEnter(tree, env); 910 } 911 912 ClassSymbol c = tree.sym; 913 if (c == null) { 914 // exit in case something drastic went wrong during enter. 915 result = null; 916 } else { 917 // make sure class has been completed: 918 c.complete(); 919 920 // If this class appears as an anonymous class 921 // in a superclass constructor call where 922 // no explicit outer instance is given, 923 // disable implicit outer instance from being passed. 924 // (This would be an illegal access to "this before super"). 925 if (env.info.isSelfCall && 926 env.tree.hasTag(NEWCLASS) && 927 ((JCNewClass)env.tree).encl == null) { 928 c.flags_field |= NOOUTERTHIS; 929 } 930 attribClass(tree.pos(), c); 931 result = tree.type = c.type; 932 } 933 } finally { 934 localCacheContext.ifPresent(LocalCacheContext::leave); 935 } 936 } 937 938 public void visitMethodDef(JCMethodDecl tree) { 939 MethodSymbol m = tree.sym; 940 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 941 942 Lint lint = env.info.lint.augment(m); 943 Lint prevLint = chk.setLint(lint); 944 MethodSymbol prevMethod = chk.setMethod(m); 945 try { 946 deferredLintHandler.flush(tree.pos()); 947 chk.checkDeprecatedAnnotation(tree.pos(), m); 948 949 950 // Create a new environment with local scope 951 // for attributing the method. 952 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 953 localEnv.info.lint = lint; 954 955 attribStats(tree.typarams, localEnv); 956 957 // If we override any other methods, check that we do so properly. 958 // JLS ??? 959 if (m.isStatic()) { 960 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 961 } else { 962 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 963 } 964 chk.checkOverride(env, tree, m); 965 966 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 967 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 968 } 969 970 // Enter all type parameters into the local method scope. 971 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 972 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 973 974 ClassSymbol owner = env.enclClass.sym; 975 if ((owner.flags() & ANNOTATION) != 0 && 976 tree.params.nonEmpty()) 977 log.error(tree.params.head.pos(), 978 "intf.annotation.members.cant.have.params"); 979 980 // Attribute all value parameters. 981 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 982 attribStat(l.head, localEnv); 983 } 984 985 chk.checkVarargsMethodDecl(localEnv, tree); 986 987 // Check that type parameters are well-formed. 988 chk.validate(tree.typarams, localEnv); 989 990 // Check that result type is well-formed. 991 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 992 chk.validate(tree.restype, localEnv); 993 994 // Check that receiver type is well-formed. 995 if (tree.recvparam != null) { 996 // Use a new environment to check the receiver parameter. 997 // Otherwise I get "might not have been initialized" errors. 998 // Is there a better way? 999 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1000 attribType(tree.recvparam, newEnv); 1001 chk.validate(tree.recvparam, newEnv); 1002 } 1003 1004 // annotation method checks 1005 if ((owner.flags() & ANNOTATION) != 0) { 1006 // annotation method cannot have throws clause 1007 if (tree.thrown.nonEmpty()) { 1008 log.error(tree.thrown.head.pos(), 1009 "throws.not.allowed.in.intf.annotation"); 1010 } 1011 // annotation method cannot declare type-parameters 1012 if (tree.typarams.nonEmpty()) { 1013 log.error(tree.typarams.head.pos(), 1014 "intf.annotation.members.cant.have.type.params"); 1015 } 1016 // validate annotation method's return type (could be an annotation type) 1017 chk.validateAnnotationType(tree.restype); 1018 // ensure that annotation method does not clash with members of Object/Annotation 1019 chk.validateAnnotationMethod(tree.pos(), m); 1020 } 1021 1022 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1023 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1024 1025 if (tree.body == null) { 1026 // Empty bodies are only allowed for 1027 // abstract, native, or interface methods, or for methods 1028 // in a retrofit signature class. 1029 if (tree.defaultValue != null) { 1030 if ((owner.flags() & ANNOTATION) == 0) 1031 log.error(tree.pos(), 1032 "default.allowed.in.intf.annotation.member"); 1033 } 1034 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1035 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1036 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1037 if ((owner.flags() & INTERFACE) != 0) { 1038 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1039 } else { 1040 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1041 } 1042 } else if ((tree.mods.flags & NATIVE) != 0) { 1043 log.error(tree.pos(), "native.meth.cant.have.body"); 1044 } else { 1045 // Add an implicit super() call unless an explicit call to 1046 // super(...) or this(...) is given 1047 // or we are compiling class java.lang.Object. 1048 if (tree.name == names.init && owner.type != syms.objectType) { 1049 JCBlock body = tree.body; 1050 if (body.stats.isEmpty() || 1051 !TreeInfo.isSelfCall(body.stats.head)) { 1052 body.stats = body.stats. 1053 prepend(typeEnter.SuperCall(make.at(body.pos), 1054 List.<Type>nil(), 1055 List.<JCVariableDecl>nil(), 1056 false)); 1057 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1058 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1059 TreeInfo.isSuperCall(body.stats.head)) { 1060 // enum constructors are not allowed to call super 1061 // directly, so make sure there aren't any super calls 1062 // in enum constructors, except in the compiler 1063 // generated one. 1064 log.error(tree.body.stats.head.pos(), 1065 "call.to.super.not.allowed.in.enum.ctor", 1066 env.enclClass.sym); 1067 } 1068 } 1069 1070 // Attribute all type annotations in the body 1071 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1072 annotate.flush(); 1073 1074 // Attribute method body. 1075 attribStat(tree.body, localEnv); 1076 } 1077 1078 localEnv.info.scope.leave(); 1079 result = tree.type = m.type; 1080 } finally { 1081 chk.setLint(prevLint); 1082 chk.setMethod(prevMethod); 1083 } 1084 } 1085 1086 public void visitVarDef(JCVariableDecl tree) { 1087 // Local variables have not been entered yet, so we need to do it now: 1088 if (env.info.scope.owner.kind == MTH) { 1089 if (tree.sym != null) { 1090 // parameters have already been entered 1091 env.info.scope.enter(tree.sym); 1092 } else { 1093 try { 1094 annotate.blockAnnotations(); 1095 memberEnter.memberEnter(tree, env); 1096 } finally { 1097 annotate.unblockAnnotations(); 1098 } 1099 } 1100 } else { 1101 if (tree.init != null) { 1102 // Field initializer expression need to be entered. 1103 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1104 annotate.flush(); 1105 } 1106 } 1107 1108 VarSymbol v = tree.sym; 1109 Lint lint = env.info.lint.augment(v); 1110 Lint prevLint = chk.setLint(lint); 1111 1112 // Check that the variable's declared type is well-formed. 1113 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1114 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1115 (tree.sym.flags() & PARAMETER) != 0; 1116 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1117 1118 try { 1119 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1120 deferredLintHandler.flush(tree.pos()); 1121 chk.checkDeprecatedAnnotation(tree.pos(), v); 1122 1123 if (tree.init != null) { 1124 if ((v.flags_field & FINAL) == 0 || 1125 !memberEnter.needsLazyConstValue(tree.init)) { 1126 // Not a compile-time constant 1127 // Attribute initializer in a new environment 1128 // with the declared variable as owner. 1129 // Check that initializer conforms to variable's declared type. 1130 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1131 initEnv.info.lint = lint; 1132 // In order to catch self-references, we set the variable's 1133 // declaration position to maximal possible value, effectively 1134 // marking the variable as undefined. 1135 initEnv.info.enclVar = v; 1136 attribExpr(tree.init, initEnv, v.type); 1137 } 1138 } 1139 result = tree.type = v.type; 1140 } 1141 finally { 1142 chk.setLint(prevLint); 1143 } 1144 } 1145 1146 public void visitSkip(JCSkip tree) { 1147 result = null; 1148 } 1149 1150 public void visitBlock(JCBlock tree) { 1151 if (env.info.scope.owner.kind == TYP) { 1152 // Block is a static or instance initializer; 1153 // let the owner of the environment be a freshly 1154 // created BLOCK-method. 1155 Symbol fakeOwner = 1156 new MethodSymbol(tree.flags | BLOCK | 1157 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1158 env.info.scope.owner); 1159 final Env<AttrContext> localEnv = 1160 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1161 1162 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1163 // Attribute all type annotations in the block 1164 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1165 annotate.flush(); 1166 attribStats(tree.stats, localEnv); 1167 1168 { 1169 // Store init and clinit type annotations with the ClassSymbol 1170 // to allow output in Gen.normalizeDefs. 1171 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1172 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1173 if ((tree.flags & STATIC) != 0) { 1174 cs.appendClassInitTypeAttributes(tas); 1175 } else { 1176 cs.appendInitTypeAttributes(tas); 1177 } 1178 } 1179 } else { 1180 // Create a new local environment with a local scope. 1181 Env<AttrContext> localEnv = 1182 env.dup(tree, env.info.dup(env.info.scope.dup())); 1183 try { 1184 attribStats(tree.stats, localEnv); 1185 } finally { 1186 localEnv.info.scope.leave(); 1187 } 1188 } 1189 result = null; 1190 } 1191 1192 public void visitDoLoop(JCDoWhileLoop tree) { 1193 attribStat(tree.body, env.dup(tree)); 1194 attribExpr(tree.cond, env, syms.booleanType); 1195 result = null; 1196 } 1197 1198 public void visitWhileLoop(JCWhileLoop tree) { 1199 attribExpr(tree.cond, env, syms.booleanType); 1200 attribStat(tree.body, env.dup(tree)); 1201 result = null; 1202 } 1203 1204 public void visitForLoop(JCForLoop tree) { 1205 Env<AttrContext> loopEnv = 1206 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1207 try { 1208 attribStats(tree.init, loopEnv); 1209 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1210 loopEnv.tree = tree; // before, we were not in loop! 1211 attribStats(tree.step, loopEnv); 1212 attribStat(tree.body, loopEnv); 1213 result = null; 1214 } 1215 finally { 1216 loopEnv.info.scope.leave(); 1217 } 1218 } 1219 1220 public void visitForeachLoop(JCEnhancedForLoop tree) { 1221 Env<AttrContext> loopEnv = 1222 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1223 try { 1224 //the Formal Parameter of a for-each loop is not in the scope when 1225 //attributing the for-each expression; we mimick this by attributing 1226 //the for-each expression first (against original scope). 1227 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1228 attribStat(tree.var, loopEnv); 1229 chk.checkNonVoid(tree.pos(), exprType); 1230 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1231 if (elemtype == null) { 1232 // or perhaps expr implements Iterable<T>? 1233 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1234 if (base == null) { 1235 log.error(tree.expr.pos(), 1236 "foreach.not.applicable.to.type", 1237 exprType, 1238 diags.fragment("type.req.array.or.iterable")); 1239 elemtype = types.createErrorType(exprType); 1240 } else { 1241 List<Type> iterableParams = base.allparams(); 1242 elemtype = iterableParams.isEmpty() 1243 ? syms.objectType 1244 : types.wildUpperBound(iterableParams.head); 1245 } 1246 } 1247 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1248 loopEnv.tree = tree; // before, we were not in loop! 1249 attribStat(tree.body, loopEnv); 1250 result = null; 1251 } 1252 finally { 1253 loopEnv.info.scope.leave(); 1254 } 1255 } 1256 1257 public void visitLabelled(JCLabeledStatement tree) { 1258 // Check that label is not used in an enclosing statement 1259 Env<AttrContext> env1 = env; 1260 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1261 if (env1.tree.hasTag(LABELLED) && 1262 ((JCLabeledStatement) env1.tree).label == tree.label) { 1263 log.error(tree.pos(), "label.already.in.use", 1264 tree.label); 1265 break; 1266 } 1267 env1 = env1.next; 1268 } 1269 1270 attribStat(tree.body, env.dup(tree)); 1271 result = null; 1272 } 1273 1274 public void visitSwitch(JCSwitch tree) { 1275 Type seltype = attribExpr(tree.selector, env); 1276 1277 Env<AttrContext> switchEnv = 1278 env.dup(tree, env.info.dup(env.info.scope.dup())); 1279 1280 try { 1281 1282 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1283 boolean stringSwitch = false; 1284 if (types.isSameType(seltype, syms.stringType)) { 1285 if (allowStringsInSwitch) { 1286 stringSwitch = true; 1287 } else { 1288 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1289 } 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 resource, 1458 names.close, 1459 List.<Type>nil(), 1460 List.<Type>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 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype); 1902 1903 chk.checkRefTypes(tree.typeargs, typeargtypes); 1904 1905 // Check that value of resulting type is admissible in the 1906 // current context. Also, capture the return type 1907 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 1908 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 1909 } 1910 chk.validate(tree.typeargs, localEnv); 1911 } 1912 //where 1913 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1914 if (methodName == names.clone && types.isArray(qualifierType)) { 1915 // as a special case, array.clone() has a result that is 1916 // the same as static type of the array being cloned 1917 return qualifierType; 1918 } else if (methodName == names.getClass && argtypes.isEmpty()) { 1919 // as a special case, x.getClass() has type Class<? extends |X|> 1920 return new ClassType(restype.getEnclosingType(), 1921 List.<Type>of(new WildcardType(types.erasure(qualifierType), 1922 BoundKind.EXTENDS, 1923 syms.boundClass)), 1924 restype.tsym, 1925 restype.getMetadata()); 1926 } else { 1927 return restype; 1928 } 1929 } 1930 1931 /** Check that given application node appears as first statement 1932 * in a constructor call. 1933 * @param tree The application node 1934 * @param env The environment current at the application. 1935 */ 1936 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1937 JCMethodDecl enclMethod = env.enclMethod; 1938 if (enclMethod != null && enclMethod.name == names.init) { 1939 JCBlock body = enclMethod.body; 1940 if (body.stats.head.hasTag(EXEC) && 1941 ((JCExpressionStatement) body.stats.head).expr == tree) 1942 return true; 1943 } 1944 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1945 TreeInfo.name(tree.meth)); 1946 return false; 1947 } 1948 1949 /** Obtain a method type with given argument types. 1950 */ 1951 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1952 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass); 1953 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1954 } 1955 1956 public void visitNewClass(final JCNewClass tree) { 1957 Type owntype = types.createErrorType(tree.type); 1958 1959 // The local environment of a class creation is 1960 // a new environment nested in the current one. 1961 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1962 1963 // The anonymous inner class definition of the new expression, 1964 // if one is defined by it. 1965 JCClassDecl cdef = tree.def; 1966 1967 // If enclosing class is given, attribute it, and 1968 // complete class name to be fully qualified 1969 JCExpression clazz = tree.clazz; // Class field following new 1970 JCExpression clazzid; // Identifier in class field 1971 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1972 annoclazzid = null; 1973 1974 if (clazz.hasTag(TYPEAPPLY)) { 1975 clazzid = ((JCTypeApply) clazz).clazz; 1976 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1977 annoclazzid = (JCAnnotatedType) clazzid; 1978 clazzid = annoclazzid.underlyingType; 1979 } 1980 } else { 1981 if (clazz.hasTag(ANNOTATED_TYPE)) { 1982 annoclazzid = (JCAnnotatedType) clazz; 1983 clazzid = annoclazzid.underlyingType; 1984 } else { 1985 clazzid = clazz; 1986 } 1987 } 1988 1989 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1990 1991 if (tree.encl != null) { 1992 // We are seeing a qualified new, of the form 1993 // <expr>.new C <...> (...) ... 1994 // In this case, we let clazz stand for the name of the 1995 // allocated class C prefixed with the type of the qualifier 1996 // expression, so that we can 1997 // resolve it with standard techniques later. I.e., if 1998 // <expr> has type T, then <expr>.new C <...> (...) 1999 // yields a clazz T.C. 2000 Type encltype = chk.checkRefType(tree.encl.pos(), 2001 attribExpr(tree.encl, env)); 2002 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2003 // from expr to the combined type, or not? Yes, do this. 2004 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2005 ((JCIdent) clazzid).name); 2006 2007 EndPosTable endPosTable = this.env.toplevel.endPositions; 2008 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2009 if (clazz.hasTag(ANNOTATED_TYPE)) { 2010 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2011 List<JCAnnotation> annos = annoType.annotations; 2012 2013 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2014 clazzid1 = make.at(tree.pos). 2015 TypeApply(clazzid1, 2016 ((JCTypeApply) clazz).arguments); 2017 } 2018 2019 clazzid1 = make.at(tree.pos). 2020 AnnotatedType(annos, clazzid1); 2021 } else if (clazz.hasTag(TYPEAPPLY)) { 2022 clazzid1 = make.at(tree.pos). 2023 TypeApply(clazzid1, 2024 ((JCTypeApply) clazz).arguments); 2025 } 2026 2027 clazz = clazzid1; 2028 } 2029 2030 // Attribute clazz expression and store 2031 // symbol + type back into the attributed tree. 2032 Type clazztype; 2033 2034 try { 2035 env.info.isNewClass = true; 2036 clazztype = TreeInfo.isEnumInit(env.tree) ? 2037 attribIdentAsEnumType(env, (JCIdent)clazz) : 2038 attribType(clazz, env); 2039 } finally { 2040 env.info.isNewClass = false; 2041 } 2042 2043 clazztype = chk.checkDiamond(tree, clazztype); 2044 chk.validate(clazz, localEnv); 2045 if (tree.encl != null) { 2046 // We have to work in this case to store 2047 // symbol + type back into the attributed tree. 2048 tree.clazz.type = clazztype; 2049 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2050 clazzid.type = ((JCIdent) clazzid).sym.type; 2051 if (annoclazzid != null) { 2052 annoclazzid.type = clazzid.type; 2053 } 2054 if (!clazztype.isErroneous()) { 2055 if (cdef != null && clazztype.tsym.isInterface()) { 2056 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2057 } else if (clazztype.tsym.isStatic()) { 2058 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2059 } 2060 } 2061 } else if (!clazztype.tsym.isInterface() && 2062 clazztype.getEnclosingType().hasTag(CLASS)) { 2063 // Check for the existence of an apropos outer instance 2064 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2065 } 2066 2067 // Attribute constructor arguments. 2068 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2069 final KindSelector pkind = 2070 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2071 List<Type> argtypes = argtypesBuf.toList(); 2072 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2073 2074 // If we have made no mistakes in the class type... 2075 if (clazztype.hasTag(CLASS)) { 2076 // Enums may not be instantiated except implicitly 2077 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2078 (!env.tree.hasTag(VARDEF) || 2079 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2080 ((JCVariableDecl) env.tree).init != tree)) 2081 log.error(tree.pos(), "enum.cant.be.instantiated"); 2082 2083 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2084 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2085 boolean skipNonDiamondPath = false; 2086 // Check that class is not abstract 2087 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2088 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2089 log.error(tree.pos(), "abstract.cant.be.instantiated", 2090 clazztype.tsym); 2091 skipNonDiamondPath = true; 2092 } else if (cdef != null && clazztype.tsym.isInterface()) { 2093 // Check that no constructor arguments are given to 2094 // anonymous classes implementing an interface 2095 if (!argtypes.isEmpty()) 2096 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2097 2098 if (!typeargtypes.isEmpty()) 2099 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2100 2101 // Error recovery: pretend no arguments were supplied. 2102 argtypes = List.nil(); 2103 typeargtypes = List.nil(); 2104 skipNonDiamondPath = true; 2105 } 2106 if (TreeInfo.isDiamond(tree)) { 2107 ClassType site = new ClassType(clazztype.getEnclosingType(), 2108 clazztype.tsym.type.getTypeArguments(), 2109 clazztype.tsym, 2110 clazztype.getMetadata()); 2111 2112 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2113 diamondEnv.info.selectSuper = cdef != null; 2114 diamondEnv.info.pendingResolutionPhase = null; 2115 2116 //if the type of the instance creation expression is a class type 2117 //apply method resolution inference (JLS 15.12.2.7). The return type 2118 //of the resolved constructor will be a partially instantiated type 2119 Symbol constructor = rs.resolveDiamond(tree.pos(), 2120 diamondEnv, 2121 site, 2122 argtypes, 2123 typeargtypes); 2124 tree.constructor = constructor.baseSymbol(); 2125 2126 final TypeSymbol csym = clazztype.tsym; 2127 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2128 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2129 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2130 constructorType = checkId(tree, site, 2131 constructor, 2132 diamondEnv, 2133 diamondResult); 2134 2135 tree.clazz.type = types.createErrorType(clazztype); 2136 if (!constructorType.isErroneous()) { 2137 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2138 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2139 } 2140 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2141 } 2142 2143 // Resolve the called constructor under the assumption 2144 // that we are referring to a superclass instance of the 2145 // current instance (JLS ???). 2146 else if (!skipNonDiamondPath) { 2147 //the following code alters some of the fields in the current 2148 //AttrContext - hence, the current context must be dup'ed in 2149 //order to avoid downstream failures 2150 Env<AttrContext> rsEnv = localEnv.dup(tree); 2151 rsEnv.info.selectSuper = cdef != null; 2152 rsEnv.info.pendingResolutionPhase = null; 2153 tree.constructor = rs.resolveConstructor( 2154 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2155 if (cdef == null) { //do not check twice! 2156 tree.constructorType = checkId(tree, 2157 clazztype, 2158 tree.constructor, 2159 rsEnv, 2160 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2161 if (rsEnv.info.lastResolveVarargs()) 2162 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2163 } 2164 } 2165 2166 if (cdef != null) { 2167 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2168 return; 2169 } 2170 2171 if (tree.constructor != null && tree.constructor.kind == MTH) 2172 owntype = clazztype; 2173 } 2174 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2175 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2176 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2177 //we need to wait for inference to finish and then replace inference vars in the constructor type 2178 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2179 instantiatedContext -> { 2180 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2181 }); 2182 } 2183 chk.validate(tree.typeargs, localEnv); 2184 } 2185 2186 // where 2187 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2188 JCClassDecl cdef, Env<AttrContext> localEnv, 2189 List<Type> argtypes, List<Type> typeargtypes, 2190 KindSelector pkind) { 2191 // We are seeing an anonymous class instance creation. 2192 // In this case, the class instance creation 2193 // expression 2194 // 2195 // E.new <typeargs1>C<typargs2>(args) { ... } 2196 // 2197 // is represented internally as 2198 // 2199 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2200 // 2201 // This expression is then *transformed* as follows: 2202 // 2203 // (1) add an extends or implements clause 2204 // (2) add a constructor. 2205 // 2206 // For instance, if C is a class, and ET is the type of E, 2207 // the expression 2208 // 2209 // E.new <typeargs1>C<typargs2>(args) { ... } 2210 // 2211 // is translated to (where X is a fresh name and typarams is the 2212 // parameter list of the super constructor): 2213 // 2214 // new <typeargs1>X(<*nullchk*>E, args) where 2215 // X extends C<typargs2> { 2216 // <typarams> X(ET e, args) { 2217 // e.<typeargs1>super(args) 2218 // } 2219 // ... 2220 // } 2221 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2222 final boolean isDiamond = TreeInfo.isDiamond(tree); 2223 if (isDiamond 2224 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2225 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2226 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2227 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2228 instantiatedContext -> { 2229 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2230 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2231 ResultInfo prevResult = this.resultInfo; 2232 try { 2233 this.resultInfo = resultInfoForClassDefinition; 2234 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2235 localEnv, argtypes, typeargtypes, pkind); 2236 } finally { 2237 this.resultInfo = prevResult; 2238 } 2239 }); 2240 } else { 2241 if (isDiamond && clazztype.hasTag(CLASS)) { 2242 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2243 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2244 // One or more types inferred in the previous steps is non-denotable. 2245 Fragment fragment = Diamond(clazztype.tsym); 2246 log.error(tree.clazz.pos(), 2247 Errors.CantApplyDiamond1( 2248 fragment, 2249 invalidDiamondArgs.size() > 1 ? 2250 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2251 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2252 } 2253 // For <>(){}, inferred types must also be accessible. 2254 for (Type t : clazztype.getTypeArguments()) { 2255 rs.checkAccessibleType(env, t); 2256 } 2257 } 2258 2259 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2260 // false for isInterface call even when the original type is an interface. 2261 boolean implementing = clazztype.tsym.isInterface() || 2262 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2263 2264 if (implementing) { 2265 cdef.implementing = List.of(clazz); 2266 } else { 2267 cdef.extending = clazz; 2268 } 2269 2270 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2271 isSerializable(clazztype)) { 2272 localEnv.info.isSerializable = true; 2273 } 2274 2275 attribStat(cdef, localEnv); 2276 2277 List<Type> finalargtypes; 2278 // If an outer instance is given, 2279 // prefix it to the constructor arguments 2280 // and delete it from the new expression 2281 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2282 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2283 finalargtypes = argtypes.prepend(tree.encl.type); 2284 tree.encl = null; 2285 } else { 2286 finalargtypes = argtypes; 2287 } 2288 2289 // Reassign clazztype and recompute constructor. As this necessarily involves 2290 // another attribution pass for deferred types in the case of <>, replicate 2291 // them. Original arguments have right decorations already. 2292 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2293 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2294 } 2295 2296 clazztype = cdef.sym.type; 2297 Symbol sym = tree.constructor = rs.resolveConstructor( 2298 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2299 Assert.check(!sym.kind.isResolutionError()); 2300 tree.constructor = sym; 2301 tree.constructorType = checkId(tree, 2302 clazztype, 2303 tree.constructor, 2304 localEnv, 2305 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2306 } 2307 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2308 clazztype : types.createErrorType(tree.type); 2309 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2310 chk.validate(tree.typeargs, localEnv); 2311 } 2312 2313 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2314 return new Check.NestedCheckContext(checkContext) { 2315 @Override 2316 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2317 enclosingContext.report(clazz.clazz, 2318 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2319 } 2320 }; 2321 } 2322 2323 /** Make an attributed null check tree. 2324 */ 2325 public JCExpression makeNullCheck(JCExpression arg) { 2326 // optimization: X.this is never null; skip null check 2327 Name name = TreeInfo.name(arg); 2328 if (name == names._this || name == names._super) return arg; 2329 2330 JCTree.Tag optag = NULLCHK; 2331 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2332 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2333 tree.type = arg.type; 2334 return tree; 2335 } 2336 2337 public void visitNewArray(JCNewArray tree) { 2338 Type owntype = types.createErrorType(tree.type); 2339 Env<AttrContext> localEnv = env.dup(tree); 2340 Type elemtype; 2341 if (tree.elemtype != null) { 2342 elemtype = attribType(tree.elemtype, localEnv); 2343 chk.validate(tree.elemtype, localEnv); 2344 owntype = elemtype; 2345 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2346 attribExpr(l.head, localEnv, syms.intType); 2347 owntype = new ArrayType(owntype, syms.arrayClass); 2348 } 2349 } else { 2350 // we are seeing an untyped aggregate { ... } 2351 // this is allowed only if the prototype is an array 2352 if (pt().hasTag(ARRAY)) { 2353 elemtype = types.elemtype(pt()); 2354 } else { 2355 if (!pt().hasTag(ERROR)) { 2356 log.error(tree.pos(), "illegal.initializer.for.type", 2357 pt()); 2358 } 2359 elemtype = types.createErrorType(pt()); 2360 } 2361 } 2362 if (tree.elems != null) { 2363 attribExprs(tree.elems, localEnv, elemtype); 2364 owntype = new ArrayType(elemtype, syms.arrayClass); 2365 } 2366 if (!types.isReifiable(elemtype)) 2367 log.error(tree.pos(), "generic.array.creation"); 2368 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2369 } 2370 2371 /* 2372 * A lambda expression can only be attributed when a target-type is available. 2373 * In addition, if the target-type is that of a functional interface whose 2374 * descriptor contains inference variables in argument position the lambda expression 2375 * is 'stuck' (see DeferredAttr). 2376 */ 2377 @Override 2378 public void visitLambda(final JCLambda that) { 2379 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2380 if (pt().hasTag(NONE)) { 2381 //lambda only allowed in assignment or method invocation/cast context 2382 log.error(that.pos(), "unexpected.lambda"); 2383 } 2384 result = that.type = types.createErrorType(pt()); 2385 return; 2386 } 2387 //create an environment for attribution of the lambda expression 2388 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2389 boolean needsRecovery = 2390 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2391 try { 2392 if (needsRecovery && isSerializable(pt())) { 2393 localEnv.info.isSerializable = true; 2394 } 2395 List<Type> explicitParamTypes = null; 2396 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2397 //attribute lambda parameters 2398 attribStats(that.params, localEnv); 2399 explicitParamTypes = TreeInfo.types(that.params); 2400 } 2401 2402 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2403 Type currentTarget = targetInfo.target; 2404 Type lambdaType = targetInfo.descriptor; 2405 2406 if (currentTarget.isErroneous()) { 2407 result = that.type = currentTarget; 2408 return; 2409 } 2410 2411 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2412 2413 if (lambdaType.hasTag(FORALL)) { 2414 //lambda expression target desc cannot be a generic method 2415 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2416 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2417 result = that.type = types.createErrorType(pt()); 2418 return; 2419 } 2420 2421 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2422 //add param type info in the AST 2423 List<Type> actuals = lambdaType.getParameterTypes(); 2424 List<JCVariableDecl> params = that.params; 2425 2426 boolean arityMismatch = false; 2427 2428 while (params.nonEmpty()) { 2429 if (actuals.isEmpty()) { 2430 //not enough actuals to perform lambda parameter inference 2431 arityMismatch = true; 2432 } 2433 //reset previously set info 2434 Type argType = arityMismatch ? 2435 syms.errType : 2436 actuals.head; 2437 params.head.vartype = make.at(params.head).Type(argType); 2438 params.head.sym = null; 2439 actuals = actuals.isEmpty() ? 2440 actuals : 2441 actuals.tail; 2442 params = params.tail; 2443 } 2444 2445 //attribute lambda parameters 2446 attribStats(that.params, localEnv); 2447 2448 if (arityMismatch) { 2449 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2450 result = that.type = types.createErrorType(currentTarget); 2451 return; 2452 } 2453 } 2454 2455 //from this point on, no recovery is needed; if we are in assignment context 2456 //we will be able to attribute the whole lambda body, regardless of errors; 2457 //if we are in a 'check' method context, and the lambda is not compatible 2458 //with the target-type, it will be recovered anyway in Attr.checkId 2459 needsRecovery = false; 2460 2461 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2462 lambdaBodyResult(that, lambdaType, resultInfo); 2463 2464 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2465 attribTree(that.getBody(), localEnv, bodyResultInfo); 2466 } else { 2467 JCBlock body = (JCBlock)that.body; 2468 attribStats(body.stats, localEnv); 2469 } 2470 2471 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2472 2473 boolean isSpeculativeRound = 2474 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2475 2476 preFlow(that); 2477 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2478 2479 that.type = currentTarget; //avoids recovery at this stage 2480 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2481 2482 if (!isSpeculativeRound) { 2483 //add thrown types as bounds to the thrown types free variables if needed: 2484 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2485 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2486 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2487 2488 chk.unhandled(inferredThrownTypes, thrownTypes); 2489 } 2490 2491 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2492 } 2493 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2494 } catch (Types.FunctionDescriptorLookupError ex) { 2495 JCDiagnostic cause = ex.getDiagnostic(); 2496 resultInfo.checkContext.report(that, cause); 2497 result = that.type = types.createErrorType(pt()); 2498 return; 2499 } catch (Throwable t) { 2500 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2501 //as that would likely cause the same exception again. 2502 needsRecovery = false; 2503 throw t; 2504 } finally { 2505 localEnv.info.scope.leave(); 2506 if (needsRecovery) { 2507 attribTree(that, env, recoveryInfo); 2508 } 2509 } 2510 } 2511 //where 2512 class TargetInfo { 2513 Type target; 2514 Type descriptor; 2515 2516 public TargetInfo(Type target, Type descriptor) { 2517 this.target = target; 2518 this.descriptor = descriptor; 2519 } 2520 } 2521 2522 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2523 Type lambdaType; 2524 Type currentTarget = resultInfo.pt; 2525 if (resultInfo.pt != Type.recoveryType) { 2526 /* We need to adjust the target. If the target is an 2527 * intersection type, for example: SAM & I1 & I2 ... 2528 * the target will be updated to SAM 2529 */ 2530 currentTarget = targetChecker.visit(currentTarget, that); 2531 if (explicitParamTypes != null) { 2532 currentTarget = infer.instantiateFunctionalInterface(that, 2533 currentTarget, explicitParamTypes, resultInfo.checkContext); 2534 } 2535 currentTarget = types.removeWildcards(currentTarget); 2536 lambdaType = types.findDescriptorType(currentTarget); 2537 } else { 2538 currentTarget = Type.recoveryType; 2539 lambdaType = fallbackDescriptorType(that); 2540 } 2541 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2542 //lambda expression target desc cannot be a generic method 2543 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2544 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2545 currentTarget = types.createErrorType(pt()); 2546 } 2547 return new TargetInfo(currentTarget, lambdaType); 2548 } 2549 2550 void preFlow(JCLambda tree) { 2551 new PostAttrAnalyzer() { 2552 @Override 2553 public void scan(JCTree tree) { 2554 if (tree == null || 2555 (tree.type != null && 2556 tree.type == Type.stuckType)) { 2557 //don't touch stuck expressions! 2558 return; 2559 } 2560 super.scan(tree); 2561 } 2562 }.scan(tree); 2563 } 2564 2565 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2566 2567 @Override 2568 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2569 return t.isIntersection() ? 2570 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2571 } 2572 2573 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2574 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2575 Type target = null; 2576 for (Type bound : ict.getExplicitComponents()) { 2577 TypeSymbol boundSym = bound.tsym; 2578 if (types.isFunctionalInterface(boundSym) && 2579 types.findDescriptorSymbol(boundSym) == desc) { 2580 target = bound; 2581 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2582 //bound must be an interface 2583 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2584 } 2585 } 2586 return target != null ? 2587 target : 2588 ict.getExplicitComponents().head; //error recovery 2589 } 2590 2591 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2592 ListBuffer<Type> targs = new ListBuffer<>(); 2593 ListBuffer<Type> supertypes = new ListBuffer<>(); 2594 for (Type i : ict.interfaces_field) { 2595 if (i.isParameterized()) { 2596 targs.appendList(i.tsym.type.allparams()); 2597 } 2598 supertypes.append(i.tsym.type); 2599 } 2600 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2601 notionalIntf.allparams_field = targs.toList(); 2602 notionalIntf.tsym.flags_field |= INTERFACE; 2603 return notionalIntf.tsym; 2604 } 2605 2606 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2607 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2608 diags.fragment(key, args))); 2609 } 2610 }; 2611 2612 private Type fallbackDescriptorType(JCExpression tree) { 2613 switch (tree.getTag()) { 2614 case LAMBDA: 2615 JCLambda lambda = (JCLambda)tree; 2616 List<Type> argtypes = List.nil(); 2617 for (JCVariableDecl param : lambda.params) { 2618 argtypes = param.vartype != null ? 2619 argtypes.append(param.vartype.type) : 2620 argtypes.append(syms.errType); 2621 } 2622 return new MethodType(argtypes, Type.recoveryType, 2623 List.of(syms.throwableType), syms.methodClass); 2624 case REFERENCE: 2625 return new MethodType(List.<Type>nil(), Type.recoveryType, 2626 List.of(syms.throwableType), syms.methodClass); 2627 default: 2628 Assert.error("Cannot get here!"); 2629 } 2630 return null; 2631 } 2632 2633 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2634 final InferenceContext inferenceContext, final Type... ts) { 2635 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2636 } 2637 2638 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2639 final InferenceContext inferenceContext, final List<Type> ts) { 2640 if (inferenceContext.free(ts)) { 2641 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() { 2642 @Override 2643 public void typesInferred(InferenceContext inferenceContext) { 2644 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts)); 2645 } 2646 }); 2647 } else { 2648 for (Type t : ts) { 2649 rs.checkAccessibleType(env, t); 2650 } 2651 } 2652 } 2653 2654 /** 2655 * Lambda/method reference have a special check context that ensures 2656 * that i.e. a lambda return type is compatible with the expected 2657 * type according to both the inherited context and the assignment 2658 * context. 2659 */ 2660 class FunctionalReturnContext extends Check.NestedCheckContext { 2661 2662 FunctionalReturnContext(CheckContext enclosingContext) { 2663 super(enclosingContext); 2664 } 2665 2666 @Override 2667 public boolean compatible(Type found, Type req, Warner warn) { 2668 //return type must be compatible in both current context and assignment context 2669 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn); 2670 } 2671 2672 @Override 2673 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2674 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2675 } 2676 } 2677 2678 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2679 2680 JCExpression expr; 2681 2682 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2683 super(enclosingContext); 2684 this.expr = expr; 2685 } 2686 2687 @Override 2688 public boolean compatible(Type found, Type req, Warner warn) { 2689 //a void return is compatible with an expression statement lambda 2690 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) || 2691 super.compatible(found, req, warn); 2692 } 2693 } 2694 2695 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2696 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2697 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2698 new FunctionalReturnContext(resultInfo.checkContext); 2699 2700 return descriptor.getReturnType() == Type.recoveryType ? 2701 recoveryInfo : 2702 new ResultInfo(KindSelector.VAL, 2703 descriptor.getReturnType(), funcContext); 2704 } 2705 2706 /** 2707 * Lambda compatibility. Check that given return types, thrown types, parameter types 2708 * are compatible with the expected functional interface descriptor. This means that: 2709 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2710 * types must be compatible with the return type of the expected descriptor. 2711 */ 2712 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2713 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2714 2715 //return values have already been checked - but if lambda has no return 2716 //values, we must ensure that void/value compatibility is correct; 2717 //this amounts at checking that, if a lambda body can complete normally, 2718 //the descriptor's return type must be void 2719 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2720 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2721 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2722 diags.fragment("missing.ret.val", returnType))); 2723 } 2724 2725 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2726 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2727 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2728 } 2729 } 2730 2731 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2732 * static field and that lambda has type annotations, these annotations will 2733 * also be stored at these fake clinit methods. 2734 * 2735 * LambdaToMethod also use fake clinit methods so they can be reused. 2736 * Also as LTM is a phase subsequent to attribution, the methods from 2737 * clinits can be safely removed by LTM to save memory. 2738 */ 2739 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2740 2741 public MethodSymbol removeClinit(ClassSymbol sym) { 2742 return clinits.remove(sym); 2743 } 2744 2745 /* This method returns an environment to be used to attribute a lambda 2746 * expression. 2747 * 2748 * The owner of this environment is a method symbol. If the current owner 2749 * is not a method, for example if the lambda is used to initialize 2750 * a field, then if the field is: 2751 * 2752 * - an instance field, we use the first constructor. 2753 * - a static field, we create a fake clinit method. 2754 */ 2755 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2756 Env<AttrContext> lambdaEnv; 2757 Symbol owner = env.info.scope.owner; 2758 if (owner.kind == VAR && owner.owner.kind == TYP) { 2759 //field initializer 2760 ClassSymbol enclClass = owner.enclClass(); 2761 Symbol newScopeOwner = env.info.scope.owner; 2762 /* if the field isn't static, then we can get the first constructor 2763 * and use it as the owner of the environment. This is what 2764 * LTM code is doing to look for type annotations so we are fine. 2765 */ 2766 if ((owner.flags() & STATIC) == 0) { 2767 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2768 newScopeOwner = s; 2769 break; 2770 } 2771 } else { 2772 /* if the field is static then we need to create a fake clinit 2773 * method, this method can later be reused by LTM. 2774 */ 2775 MethodSymbol clinit = clinits.get(enclClass); 2776 if (clinit == null) { 2777 Type clinitType = new MethodType(List.<Type>nil(), 2778 syms.voidType, List.<Type>nil(), syms.methodClass); 2779 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2780 names.clinit, clinitType, enclClass); 2781 clinit.params = List.<VarSymbol>nil(); 2782 clinits.put(enclClass, clinit); 2783 } 2784 newScopeOwner = clinit; 2785 } 2786 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2787 } else { 2788 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2789 } 2790 return lambdaEnv; 2791 } 2792 2793 @Override 2794 public void visitReference(final JCMemberReference that) { 2795 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2796 if (pt().hasTag(NONE)) { 2797 //method reference only allowed in assignment or method invocation/cast context 2798 log.error(that.pos(), "unexpected.mref"); 2799 } 2800 result = that.type = types.createErrorType(pt()); 2801 return; 2802 } 2803 final Env<AttrContext> localEnv = env.dup(that); 2804 try { 2805 //attribute member reference qualifier - if this is a constructor 2806 //reference, the expected kind must be a type 2807 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2808 2809 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2810 exprType = chk.checkConstructorRefType(that.expr, exprType); 2811 if (!exprType.isErroneous() && 2812 exprType.isRaw() && 2813 that.typeargs != null) { 2814 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2815 diags.fragment("mref.infer.and.explicit.params")); 2816 exprType = types.createErrorType(exprType); 2817 } 2818 } 2819 2820 if (exprType.isErroneous()) { 2821 //if the qualifier expression contains problems, 2822 //give up attribution of method reference 2823 result = that.type = exprType; 2824 return; 2825 } 2826 2827 if (TreeInfo.isStaticSelector(that.expr, names)) { 2828 //if the qualifier is a type, validate it; raw warning check is 2829 //omitted as we don't know at this stage as to whether this is a 2830 //raw selector (because of inference) 2831 chk.validate(that.expr, env, false); 2832 } else { 2833 Symbol lhsSym = TreeInfo.symbol(that.expr); 2834 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2835 } 2836 //attrib type-arguments 2837 List<Type> typeargtypes = List.nil(); 2838 if (that.typeargs != null) { 2839 typeargtypes = attribTypes(that.typeargs, localEnv); 2840 } 2841 2842 boolean isTargetSerializable = 2843 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2844 isSerializable(pt()); 2845 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2846 Type currentTarget = targetInfo.target; 2847 Type desc = targetInfo.descriptor; 2848 2849 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2850 List<Type> argtypes = desc.getParameterTypes(); 2851 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2852 2853 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2854 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2855 } 2856 2857 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2858 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2859 try { 2860 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2861 that.name, argtypes, typeargtypes, referenceCheck, 2862 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2863 } finally { 2864 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2865 } 2866 2867 Symbol refSym = refResult.fst; 2868 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2869 2870 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2871 * JDK-8075541 2872 */ 2873 if (refSym.kind != MTH) { 2874 boolean targetError; 2875 switch (refSym.kind) { 2876 case ABSENT_MTH: 2877 case MISSING_ENCL: 2878 targetError = false; 2879 break; 2880 case WRONG_MTH: 2881 case WRONG_MTHS: 2882 case AMBIGUOUS: 2883 case HIDDEN: 2884 case STATICERR: 2885 targetError = true; 2886 break; 2887 default: 2888 Assert.error("unexpected result kind " + refSym.kind); 2889 targetError = false; 2890 } 2891 2892 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2893 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2894 2895 JCDiagnostic.DiagnosticType diagKind = targetError ? 2896 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2897 2898 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2899 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2900 2901 if (targetError && currentTarget == Type.recoveryType) { 2902 //a target error doesn't make sense during recovery stage 2903 //as we don't know what actual parameter types are 2904 result = that.type = currentTarget; 2905 return; 2906 } else { 2907 if (targetError) { 2908 resultInfo.checkContext.report(that, diag); 2909 } else { 2910 log.report(diag); 2911 } 2912 result = that.type = types.createErrorType(currentTarget); 2913 return; 2914 } 2915 } 2916 2917 that.sym = refSym.baseSymbol(); 2918 that.kind = lookupHelper.referenceKind(that.sym); 2919 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2920 2921 if (desc.getReturnType() == Type.recoveryType) { 2922 // stop here 2923 result = that.type = currentTarget; 2924 return; 2925 } 2926 2927 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2928 2929 if (that.getMode() == ReferenceMode.INVOKE && 2930 TreeInfo.isStaticSelector(that.expr, names) && 2931 that.kind.isUnbound() && 2932 !desc.getParameterTypes().head.isParameterized()) { 2933 chk.checkRaw(that.expr, localEnv); 2934 } 2935 2936 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2937 exprType.getTypeArguments().nonEmpty()) { 2938 //static ref with class type-args 2939 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2940 diags.fragment("static.mref.with.targs")); 2941 result = that.type = types.createErrorType(currentTarget); 2942 return; 2943 } 2944 2945 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2946 // Check that super-qualified symbols are not abstract (JLS) 2947 rs.checkNonAbstract(that.pos(), that.sym); 2948 } 2949 2950 if (isTargetSerializable) { 2951 chk.checkElemAccessFromSerializableLambda(that); 2952 } 2953 } 2954 2955 ResultInfo checkInfo = 2956 resultInfo.dup(newMethodTemplate( 2957 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2958 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2959 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2960 2961 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 2962 2963 if (that.kind.isUnbound() && 2964 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2965 //re-generate inference constraints for unbound receiver 2966 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 2967 //cannot happen as this has already been checked - we just need 2968 //to regenerate the inference constraints, as that has been lost 2969 //as a result of the call to inferenceContext.save() 2970 Assert.error("Can't get here"); 2971 } 2972 } 2973 2974 if (!refType.isErroneous()) { 2975 refType = types.createMethodTypeWithReturn(refType, 2976 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 2977 } 2978 2979 //go ahead with standard method reference compatibility check - note that param check 2980 //is a no-op (as this has been taken care during method applicability) 2981 boolean isSpeculativeRound = 2982 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2983 2984 that.type = currentTarget; //avoids recovery at this stage 2985 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 2986 if (!isSpeculativeRound) { 2987 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 2988 } 2989 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2990 } catch (Types.FunctionDescriptorLookupError ex) { 2991 JCDiagnostic cause = ex.getDiagnostic(); 2992 resultInfo.checkContext.report(that, cause); 2993 result = that.type = types.createErrorType(pt()); 2994 return; 2995 } 2996 } 2997 //where 2998 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 2999 //if this is a constructor reference, the expected kind must be a type 3000 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3001 KindSelector.VAL_TYP : KindSelector.TYP, 3002 Type.noType); 3003 } 3004 3005 3006 @SuppressWarnings("fallthrough") 3007 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3008 InferenceContext inferenceContext = checkContext.inferenceContext(); 3009 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3010 3011 Type resType; 3012 switch (tree.getMode()) { 3013 case NEW: 3014 if (!tree.expr.type.isRaw()) { 3015 resType = tree.expr.type; 3016 break; 3017 } 3018 default: 3019 resType = refType.getReturnType(); 3020 } 3021 3022 Type incompatibleReturnType = resType; 3023 3024 if (returnType.hasTag(VOID)) { 3025 incompatibleReturnType = null; 3026 } 3027 3028 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3029 if (resType.isErroneous() || 3030 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) { 3031 incompatibleReturnType = null; 3032 } 3033 } 3034 3035 if (incompatibleReturnType != null) { 3036 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3037 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3038 } else { 3039 if (inferenceContext.free(refType)) { 3040 // we need to wait for inference to finish and then replace inference vars in the referent type 3041 inferenceContext.addFreeTypeListener(List.of(refType), 3042 instantiatedContext -> { 3043 tree.referentType = instantiatedContext.asInstType(refType); 3044 }); 3045 } else { 3046 tree.referentType = refType; 3047 } 3048 } 3049 3050 if (!speculativeAttr) { 3051 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3052 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3053 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3054 } 3055 } 3056 } 3057 3058 /** 3059 * Set functional type info on the underlying AST. Note: as the target descriptor 3060 * might contain inference variables, we might need to register an hook in the 3061 * current inference context. 3062 */ 3063 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3064 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3065 if (checkContext.inferenceContext().free(descriptorType)) { 3066 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() { 3067 public void typesInferred(InferenceContext inferenceContext) { 3068 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3069 inferenceContext.asInstType(primaryTarget), checkContext); 3070 } 3071 }); 3072 } else { 3073 ListBuffer<Type> targets = new ListBuffer<>(); 3074 if (pt.hasTag(CLASS)) { 3075 if (pt.isCompound()) { 3076 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3077 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3078 if (t != primaryTarget) { 3079 targets.append(types.removeWildcards(t)); 3080 } 3081 } 3082 } else { 3083 targets.append(types.removeWildcards(primaryTarget)); 3084 } 3085 } 3086 fExpr.targets = targets.toList(); 3087 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3088 pt != Type.recoveryType) { 3089 //check that functional interface class is well-formed 3090 try { 3091 /* Types.makeFunctionalInterfaceClass() may throw an exception 3092 * when it's executed post-inference. See the listener code 3093 * above. 3094 */ 3095 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3096 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3097 if (csym != null) { 3098 chk.checkImplementations(env.tree, csym, csym); 3099 try { 3100 //perform an additional functional interface check on the synthetic class, 3101 //as there may be spurious errors for raw targets - because of existing issues 3102 //with membership and inheritance (see JDK-8074570). 3103 csym.flags_field |= INTERFACE; 3104 types.findDescriptorType(csym.type); 3105 } catch (FunctionDescriptorLookupError err) { 3106 resultInfo.checkContext.report(fExpr, 3107 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3108 } 3109 } 3110 } catch (Types.FunctionDescriptorLookupError ex) { 3111 JCDiagnostic cause = ex.getDiagnostic(); 3112 resultInfo.checkContext.report(env.tree, cause); 3113 } 3114 } 3115 } 3116 } 3117 3118 public void visitParens(JCParens tree) { 3119 Type owntype = attribTree(tree.expr, env, resultInfo); 3120 result = check(tree, owntype, pkind(), resultInfo); 3121 Symbol sym = TreeInfo.symbol(tree); 3122 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3123 log.error(tree.pos(), "illegal.start.of.type"); 3124 } 3125 3126 public void visitAssign(JCAssign tree) { 3127 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3128 Type capturedType = capture(owntype); 3129 attribExpr(tree.rhs, env, owntype); 3130 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3131 } 3132 3133 public void visitAssignop(JCAssignOp tree) { 3134 // Attribute arguments. 3135 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3136 Type operand = attribExpr(tree.rhs, env); 3137 // Find operator. 3138 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3139 if (operator.kind == MTH && 3140 !owntype.isErroneous() && 3141 !operand.isErroneous()) { 3142 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3143 chk.checkCastable(tree.rhs.pos(), 3144 operator.type.getReturnType(), 3145 owntype); 3146 } 3147 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3148 } 3149 3150 public void visitUnary(JCUnary tree) { 3151 // Attribute arguments. 3152 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3153 ? attribTree(tree.arg, env, varAssignmentInfo) 3154 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3155 3156 // Find operator. 3157 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3158 Type owntype = types.createErrorType(tree.type); 3159 if (operator.kind == MTH && 3160 !argtype.isErroneous()) { 3161 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3162 ? tree.arg.type 3163 : operator.type.getReturnType(); 3164 int opc = ((OperatorSymbol)operator).opcode; 3165 3166 // If the argument is constant, fold it. 3167 if (argtype.constValue() != null) { 3168 Type ctype = cfolder.fold1(opc, argtype); 3169 if (ctype != null) { 3170 owntype = cfolder.coerce(ctype, owntype); 3171 } 3172 } 3173 } 3174 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3175 } 3176 3177 public void visitBinary(JCBinary tree) { 3178 // Attribute arguments. 3179 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3180 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3181 // Find operator. 3182 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3183 Type owntype = types.createErrorType(tree.type); 3184 if (operator.kind == MTH && 3185 !left.isErroneous() && 3186 !right.isErroneous()) { 3187 owntype = operator.type.getReturnType(); 3188 int opc = ((OperatorSymbol)operator).opcode; 3189 // If both arguments are constants, fold them. 3190 if (left.constValue() != null && right.constValue() != null) { 3191 Type ctype = cfolder.fold2(opc, left, right); 3192 if (ctype != null) { 3193 owntype = cfolder.coerce(ctype, owntype); 3194 } 3195 } 3196 3197 // Check that argument types of a reference ==, != are 3198 // castable to each other, (JLS 15.21). Note: unboxing 3199 // comparisons will not have an acmp* opc at this point. 3200 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3201 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3202 log.error(tree.pos(), "incomparable.types", left, right); 3203 } 3204 } 3205 3206 chk.checkDivZero(tree.rhs.pos(), operator, right); 3207 } 3208 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3209 } 3210 3211 public void visitTypeCast(final JCTypeCast tree) { 3212 Type clazztype = attribType(tree.clazz, env); 3213 chk.validate(tree.clazz, env, false); 3214 //a fresh environment is required for 292 inference to work properly --- 3215 //see Infer.instantiatePolymorphicSignatureInstance() 3216 Env<AttrContext> localEnv = env.dup(tree); 3217 //should we propagate the target type? 3218 final ResultInfo castInfo; 3219 JCExpression expr = TreeInfo.skipParens(tree.expr); 3220 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3221 if (isPoly) { 3222 //expression is a poly - we need to propagate target type info 3223 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3224 new Check.NestedCheckContext(resultInfo.checkContext) { 3225 @Override 3226 public boolean compatible(Type found, Type req, Warner warn) { 3227 return types.isCastable(found, req, warn); 3228 } 3229 }); 3230 } else { 3231 //standalone cast - target-type info is not propagated 3232 castInfo = unknownExprInfo; 3233 } 3234 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3235 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3236 if (exprtype.constValue() != null) 3237 owntype = cfolder.coerce(exprtype, owntype); 3238 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3239 if (!isPoly) 3240 chk.checkRedundantCast(localEnv, tree); 3241 } 3242 3243 public void visitTypeTest(JCInstanceOf tree) { 3244 Type exprtype = chk.checkNullOrRefType( 3245 tree.expr.pos(), attribExpr(tree.expr, env)); 3246 Type clazztype = attribType(tree.clazz, env); 3247 if (!clazztype.hasTag(TYPEVAR)) { 3248 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3249 } 3250 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3251 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3252 clazztype = types.createErrorType(clazztype); 3253 } 3254 chk.validate(tree.clazz, env, false); 3255 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3256 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3257 } 3258 3259 public void visitIndexed(JCArrayAccess tree) { 3260 Type owntype = types.createErrorType(tree.type); 3261 Type atype = attribExpr(tree.indexed, env); 3262 attribExpr(tree.index, env, syms.intType); 3263 if (types.isArray(atype)) 3264 owntype = types.elemtype(atype); 3265 else if (!atype.hasTag(ERROR)) 3266 log.error(tree.pos(), "array.req.but.found", atype); 3267 if (!pkind().contains(KindSelector.VAL)) 3268 owntype = capture(owntype); 3269 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3270 } 3271 3272 public void visitIdent(JCIdent tree) { 3273 Symbol sym; 3274 3275 // Find symbol 3276 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3277 // If we are looking for a method, the prototype `pt' will be a 3278 // method type with the type of the call's arguments as parameters. 3279 env.info.pendingResolutionPhase = null; 3280 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3281 } else if (tree.sym != null && tree.sym.kind != VAR) { 3282 sym = tree.sym; 3283 } else { 3284 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3285 } 3286 tree.sym = sym; 3287 3288 // (1) Also find the environment current for the class where 3289 // sym is defined (`symEnv'). 3290 // Only for pre-tiger versions (1.4 and earlier): 3291 // (2) Also determine whether we access symbol out of an anonymous 3292 // class in a this or super call. This is illegal for instance 3293 // members since such classes don't carry a this$n link. 3294 // (`noOuterThisPath'). 3295 Env<AttrContext> symEnv = env; 3296 boolean noOuterThisPath = false; 3297 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3298 sym.kind.matches(KindSelector.VAL_MTH) && 3299 sym.owner.kind == TYP && 3300 tree.name != names._this && tree.name != names._super) { 3301 3302 // Find environment in which identifier is defined. 3303 while (symEnv.outer != null && 3304 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3305 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3306 noOuterThisPath = false; 3307 symEnv = symEnv.outer; 3308 } 3309 } 3310 3311 // If symbol is a variable, ... 3312 if (sym.kind == VAR) { 3313 VarSymbol v = (VarSymbol)sym; 3314 3315 // ..., evaluate its initializer, if it has one, and check for 3316 // illegal forward reference. 3317 checkInit(tree, env, v, false); 3318 3319 // If we are expecting a variable (as opposed to a value), check 3320 // that the variable is assignable in the current environment. 3321 if (KindSelector.ASG.subset(pkind())) 3322 checkAssignable(tree.pos(), v, null, env); 3323 } 3324 3325 // In a constructor body, 3326 // if symbol is a field or instance method, check that it is 3327 // not accessed before the supertype constructor is called. 3328 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3329 sym.kind.matches(KindSelector.VAL_MTH) && 3330 sym.owner.kind == TYP && 3331 (sym.flags() & STATIC) == 0) { 3332 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3333 sym : thisSym(tree.pos(), env)); 3334 } 3335 Env<AttrContext> env1 = env; 3336 if (sym.kind != ERR && sym.kind != TYP && 3337 sym.owner != null && sym.owner != env1.enclClass.sym) { 3338 // If the found symbol is inaccessible, then it is 3339 // accessed through an enclosing instance. Locate this 3340 // enclosing instance: 3341 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3342 env1 = env1.outer; 3343 } 3344 3345 if (env.info.isSerializable) { 3346 chk.checkElemAccessFromSerializableLambda(tree); 3347 } 3348 3349 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3350 } 3351 3352 public void visitSelect(JCFieldAccess tree) { 3353 // Determine the expected kind of the qualifier expression. 3354 KindSelector skind = KindSelector.NIL; 3355 if (tree.name == names._this || tree.name == names._super || 3356 tree.name == names._class) 3357 { 3358 skind = KindSelector.TYP; 3359 } else { 3360 if (pkind().contains(KindSelector.PCK)) 3361 skind = KindSelector.of(skind, KindSelector.PCK); 3362 if (pkind().contains(KindSelector.TYP)) 3363 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3364 if (pkind().contains(KindSelector.VAL_MTH)) 3365 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3366 } 3367 3368 // Attribute the qualifier expression, and determine its symbol (if any). 3369 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3370 if (!pkind().contains(KindSelector.TYP_PCK)) 3371 site = capture(site); // Capture field access 3372 3373 // don't allow T.class T[].class, etc 3374 if (skind == KindSelector.TYP) { 3375 Type elt = site; 3376 while (elt.hasTag(ARRAY)) 3377 elt = ((ArrayType)elt).elemtype; 3378 if (elt.hasTag(TYPEVAR)) { 3379 log.error(tree.pos(), "type.var.cant.be.deref"); 3380 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3381 tree.sym = tree.type.tsym; 3382 return ; 3383 } 3384 } 3385 3386 // If qualifier symbol is a type or `super', assert `selectSuper' 3387 // for the selection. This is relevant for determining whether 3388 // protected symbols are accessible. 3389 Symbol sitesym = TreeInfo.symbol(tree.selected); 3390 boolean selectSuperPrev = env.info.selectSuper; 3391 env.info.selectSuper = 3392 sitesym != null && 3393 sitesym.name == names._super; 3394 3395 // Determine the symbol represented by the selection. 3396 env.info.pendingResolutionPhase = null; 3397 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3398 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3399 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3400 sym = syms.errSymbol; 3401 } 3402 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3403 site = capture(site); 3404 sym = selectSym(tree, sitesym, site, env, resultInfo); 3405 } 3406 boolean varArgs = env.info.lastResolveVarargs(); 3407 tree.sym = sym; 3408 3409 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3410 site = types.skipTypeVars(site, true); 3411 } 3412 3413 // If that symbol is a variable, ... 3414 if (sym.kind == VAR) { 3415 VarSymbol v = (VarSymbol)sym; 3416 3417 // ..., evaluate its initializer, if it has one, and check for 3418 // illegal forward reference. 3419 checkInit(tree, env, v, true); 3420 3421 // If we are expecting a variable (as opposed to a value), check 3422 // that the variable is assignable in the current environment. 3423 if (KindSelector.ASG.subset(pkind())) 3424 checkAssignable(tree.pos(), v, tree.selected, env); 3425 } 3426 3427 if (sitesym != null && 3428 sitesym.kind == VAR && 3429 ((VarSymbol)sitesym).isResourceVariable() && 3430 sym.kind == MTH && 3431 sym.name.equals(names.close) && 3432 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3433 env.info.lint.isEnabled(LintCategory.TRY)) { 3434 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3435 } 3436 3437 // Disallow selecting a type from an expression 3438 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3439 tree.type = check(tree.selected, pt(), 3440 sitesym == null ? 3441 KindSelector.VAL : sitesym.kind.toSelector(), 3442 new ResultInfo(KindSelector.TYP_PCK, pt())); 3443 } 3444 3445 if (isType(sitesym)) { 3446 if (sym.name == names._this) { 3447 // If `C' is the currently compiled class, check that 3448 // C.this' does not appear in a call to a super(...) 3449 if (env.info.isSelfCall && 3450 site.tsym == env.enclClass.sym) { 3451 chk.earlyRefError(tree.pos(), sym); 3452 } 3453 } else { 3454 // Check if type-qualified fields or methods are static (JLS) 3455 if ((sym.flags() & STATIC) == 0 && 3456 !env.next.tree.hasTag(REFERENCE) && 3457 sym.name != names._super && 3458 (sym.kind == VAR || sym.kind == MTH)) { 3459 rs.accessBase(rs.new StaticError(sym), 3460 tree.pos(), site, sym.name, true); 3461 } 3462 } 3463 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3464 sym.isStatic() && sym.kind == MTH) { 3465 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3466 } 3467 } else if (sym.kind != ERR && 3468 (sym.flags() & STATIC) != 0 && 3469 sym.name != names._class) { 3470 // If the qualified item is not a type and the selected item is static, report 3471 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3472 chk.warnStatic(tree, "static.not.qualified.by.type", 3473 sym.kind.kindName(), sym.owner); 3474 } 3475 3476 // If we are selecting an instance member via a `super', ... 3477 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3478 3479 // Check that super-qualified symbols are not abstract (JLS) 3480 rs.checkNonAbstract(tree.pos(), sym); 3481 3482 if (site.isRaw()) { 3483 // Determine argument types for site. 3484 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3485 if (site1 != null) site = site1; 3486 } 3487 } 3488 3489 if (env.info.isSerializable) { 3490 chk.checkElemAccessFromSerializableLambda(tree); 3491 } 3492 3493 env.info.selectSuper = selectSuperPrev; 3494 result = checkId(tree, site, sym, env, resultInfo); 3495 } 3496 //where 3497 /** Determine symbol referenced by a Select expression, 3498 * 3499 * @param tree The select tree. 3500 * @param site The type of the selected expression, 3501 * @param env The current environment. 3502 * @param resultInfo The current result. 3503 */ 3504 private Symbol selectSym(JCFieldAccess tree, 3505 Symbol location, 3506 Type site, 3507 Env<AttrContext> env, 3508 ResultInfo resultInfo) { 3509 DiagnosticPosition pos = tree.pos(); 3510 Name name = tree.name; 3511 switch (site.getTag()) { 3512 case PACKAGE: 3513 return rs.accessBase( 3514 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3515 pos, location, site, name, true); 3516 case ARRAY: 3517 case CLASS: 3518 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3519 return rs.resolveQualifiedMethod( 3520 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3521 } else if (name == names._this || name == names._super) { 3522 return rs.resolveSelf(pos, env, site.tsym, name); 3523 } else if (name == names._class) { 3524 // In this case, we have already made sure in 3525 // visitSelect that qualifier expression is a type. 3526 Type t = syms.classType; 3527 List<Type> typeargs = List.of(types.erasure(site)); 3528 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3529 return new VarSymbol( 3530 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3531 } else { 3532 // We are seeing a plain identifier as selector. 3533 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3534 sym = rs.accessBase(sym, pos, location, site, name, true); 3535 return sym; 3536 } 3537 case WILDCARD: 3538 throw new AssertionError(tree); 3539 case TYPEVAR: 3540 // Normally, site.getUpperBound() shouldn't be null. 3541 // It should only happen during memberEnter/attribBase 3542 // when determining the super type which *must* beac 3543 // done before attributing the type variables. In 3544 // other words, we are seeing this illegal program: 3545 // class B<T> extends A<T.foo> {} 3546 Symbol sym = (site.getUpperBound() != null) 3547 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3548 : null; 3549 if (sym == null) { 3550 log.error(pos, "type.var.cant.be.deref"); 3551 return syms.errSymbol; 3552 } else { 3553 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3554 rs.new AccessError(env, site, sym) : 3555 sym; 3556 rs.accessBase(sym2, pos, location, site, name, true); 3557 return sym; 3558 } 3559 case ERROR: 3560 // preserve identifier names through errors 3561 return types.createErrorType(name, site.tsym, site).tsym; 3562 default: 3563 // The qualifier expression is of a primitive type -- only 3564 // .class is allowed for these. 3565 if (name == names._class) { 3566 // In this case, we have already made sure in Select that 3567 // qualifier expression is a type. 3568 Type t = syms.classType; 3569 Type arg = types.boxedClass(site).type; 3570 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3571 return new VarSymbol( 3572 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3573 } else { 3574 log.error(pos, "cant.deref", site); 3575 return syms.errSymbol; 3576 } 3577 } 3578 } 3579 3580 /** Determine type of identifier or select expression and check that 3581 * (1) the referenced symbol is not deprecated 3582 * (2) the symbol's type is safe (@see checkSafe) 3583 * (3) if symbol is a variable, check that its type and kind are 3584 * compatible with the prototype and protokind. 3585 * (4) if symbol is an instance field of a raw type, 3586 * which is being assigned to, issue an unchecked warning if its 3587 * type changes under erasure. 3588 * (5) if symbol is an instance method of a raw type, issue an 3589 * unchecked warning if its argument types change under erasure. 3590 * If checks succeed: 3591 * If symbol is a constant, return its constant type 3592 * else if symbol is a method, return its result type 3593 * otherwise return its type. 3594 * Otherwise return errType. 3595 * 3596 * @param tree The syntax tree representing the identifier 3597 * @param site If this is a select, the type of the selected 3598 * expression, otherwise the type of the current class. 3599 * @param sym The symbol representing the identifier. 3600 * @param env The current environment. 3601 * @param resultInfo The expected result 3602 */ 3603 Type checkId(JCTree tree, 3604 Type site, 3605 Symbol sym, 3606 Env<AttrContext> env, 3607 ResultInfo resultInfo) { 3608 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3609 checkMethodId(tree, site, sym, env, resultInfo) : 3610 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3611 } 3612 3613 Type checkMethodId(JCTree tree, 3614 Type site, 3615 Symbol sym, 3616 Env<AttrContext> env, 3617 ResultInfo resultInfo) { 3618 boolean isPolymorhicSignature = 3619 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3620 return isPolymorhicSignature ? 3621 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3622 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3623 } 3624 3625 Type checkSigPolyMethodId(JCTree tree, 3626 Type site, 3627 Symbol sym, 3628 Env<AttrContext> env, 3629 ResultInfo resultInfo) { 3630 //recover original symbol for signature polymorphic methods 3631 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3632 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3633 return sym.type; 3634 } 3635 3636 Type checkMethodIdInternal(JCTree tree, 3637 Type site, 3638 Symbol sym, 3639 Env<AttrContext> env, 3640 ResultInfo resultInfo) { 3641 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3642 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3643 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3644 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3645 return owntype; 3646 } else { 3647 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3648 } 3649 } 3650 3651 Type checkIdInternal(JCTree tree, 3652 Type site, 3653 Symbol sym, 3654 Type pt, 3655 Env<AttrContext> env, 3656 ResultInfo resultInfo) { 3657 if (pt.isErroneous()) { 3658 return types.createErrorType(site); 3659 } 3660 Type owntype; // The computed type of this identifier occurrence. 3661 switch (sym.kind) { 3662 case TYP: 3663 // For types, the computed type equals the symbol's type, 3664 // except for two situations: 3665 owntype = sym.type; 3666 if (owntype.hasTag(CLASS)) { 3667 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3668 Type ownOuter = owntype.getEnclosingType(); 3669 3670 // (a) If the symbol's type is parameterized, erase it 3671 // because no type parameters were given. 3672 // We recover generic outer type later in visitTypeApply. 3673 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3674 owntype = types.erasure(owntype); 3675 } 3676 3677 // (b) If the symbol's type is an inner class, then 3678 // we have to interpret its outer type as a superclass 3679 // of the site type. Example: 3680 // 3681 // class Tree<A> { class Visitor { ... } } 3682 // class PointTree extends Tree<Point> { ... } 3683 // ...PointTree.Visitor... 3684 // 3685 // Then the type of the last expression above is 3686 // Tree<Point>.Visitor. 3687 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3688 Type normOuter = site; 3689 if (normOuter.hasTag(CLASS)) { 3690 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3691 } 3692 if (normOuter == null) // perhaps from an import 3693 normOuter = types.erasure(ownOuter); 3694 if (normOuter != ownOuter) 3695 owntype = new ClassType( 3696 normOuter, List.<Type>nil(), owntype.tsym, 3697 owntype.getMetadata()); 3698 } 3699 } 3700 break; 3701 case VAR: 3702 VarSymbol v = (VarSymbol)sym; 3703 // Test (4): if symbol is an instance field of a raw type, 3704 // which is being assigned to, issue an unchecked warning if 3705 // its type changes under erasure. 3706 if (KindSelector.ASG.subset(pkind()) && 3707 v.owner.kind == TYP && 3708 (v.flags() & STATIC) == 0 && 3709 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3710 Type s = types.asOuterSuper(site, v.owner); 3711 if (s != null && 3712 s.isRaw() && 3713 !types.isSameType(v.type, v.erasure(types))) { 3714 chk.warnUnchecked(tree.pos(), 3715 "unchecked.assign.to.var", 3716 v, s); 3717 } 3718 } 3719 // The computed type of a variable is the type of the 3720 // variable symbol, taken as a member of the site type. 3721 owntype = (sym.owner.kind == TYP && 3722 sym.name != names._this && sym.name != names._super) 3723 ? types.memberType(site, sym) 3724 : sym.type; 3725 3726 // If the variable is a constant, record constant value in 3727 // computed type. 3728 if (v.getConstValue() != null && isStaticReference(tree)) 3729 owntype = owntype.constType(v.getConstValue()); 3730 3731 if (resultInfo.pkind == KindSelector.VAL) { 3732 owntype = capture(owntype); // capture "names as expressions" 3733 } 3734 break; 3735 case MTH: { 3736 owntype = checkMethod(site, sym, 3737 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3738 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3739 resultInfo.pt.getTypeArguments()); 3740 break; 3741 } 3742 case PCK: case ERR: 3743 owntype = sym.type; 3744 break; 3745 default: 3746 throw new AssertionError("unexpected kind: " + sym.kind + 3747 " in tree " + tree); 3748 } 3749 3750 // Emit a `deprecation' warning if symbol is deprecated. 3751 // (for constructors (but not for constructor references), the error 3752 // was given when the constructor was resolved) 3753 3754 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3755 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3756 chk.checkSunAPI(tree.pos(), sym); 3757 chk.checkProfile(tree.pos(), sym); 3758 } 3759 3760 // If symbol is a variable, check that its type and 3761 // kind are compatible with the prototype and protokind. 3762 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3763 } 3764 3765 /** Check that variable is initialized and evaluate the variable's 3766 * initializer, if not yet done. Also check that variable is not 3767 * referenced before it is defined. 3768 * @param tree The tree making up the variable reference. 3769 * @param env The current environment. 3770 * @param v The variable's symbol. 3771 */ 3772 private void checkInit(JCTree tree, 3773 Env<AttrContext> env, 3774 VarSymbol v, 3775 boolean onlyWarning) { 3776 // A forward reference is diagnosed if the declaration position 3777 // of the variable is greater than the current tree position 3778 // and the tree and variable definition occur in the same class 3779 // definition. Note that writes don't count as references. 3780 // This check applies only to class and instance 3781 // variables. Local variables follow different scope rules, 3782 // and are subject to definite assignment checking. 3783 Env<AttrContext> initEnv = enclosingInitEnv(env); 3784 if (initEnv != null && 3785 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3786 v.owner.kind == TYP && 3787 v.owner == env.info.scope.owner.enclClass() && 3788 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3789 (!env.tree.hasTag(ASSIGN) || 3790 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3791 String suffix = (initEnv.info.enclVar == v) ? 3792 "self.ref" : "forward.ref"; 3793 if (!onlyWarning || isStaticEnumField(v)) { 3794 log.error(tree.pos(), "illegal." + suffix); 3795 } else if (useBeforeDeclarationWarning) { 3796 log.warning(tree.pos(), suffix, v); 3797 } 3798 } 3799 3800 v.getConstValue(); // ensure initializer is evaluated 3801 3802 checkEnumInitializer(tree, env, v); 3803 } 3804 3805 /** 3806 * Returns the enclosing init environment associated with this env (if any). An init env 3807 * can be either a field declaration env or a static/instance initializer env. 3808 */ 3809 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3810 while (true) { 3811 switch (env.tree.getTag()) { 3812 case VARDEF: 3813 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3814 if (vdecl.sym.owner.kind == TYP) { 3815 //field 3816 return env; 3817 } 3818 break; 3819 case BLOCK: 3820 if (env.next.tree.hasTag(CLASSDEF)) { 3821 //instance/static initializer 3822 return env; 3823 } 3824 break; 3825 case METHODDEF: 3826 case CLASSDEF: 3827 case TOPLEVEL: 3828 return null; 3829 } 3830 Assert.checkNonNull(env.next); 3831 env = env.next; 3832 } 3833 } 3834 3835 /** 3836 * Check for illegal references to static members of enum. In 3837 * an enum type, constructors and initializers may not 3838 * reference its static members unless they are constant. 3839 * 3840 * @param tree The tree making up the variable reference. 3841 * @param env The current environment. 3842 * @param v The variable's symbol. 3843 * @jls section 8.9 Enums 3844 */ 3845 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3846 // JLS: 3847 // 3848 // "It is a compile-time error to reference a static field 3849 // of an enum type that is not a compile-time constant 3850 // (15.28) from constructors, instance initializer blocks, 3851 // or instance variable initializer expressions of that 3852 // type. It is a compile-time error for the constructors, 3853 // instance initializer blocks, or instance variable 3854 // initializer expressions of an enum constant e to refer 3855 // to itself or to an enum constant of the same type that 3856 // is declared to the right of e." 3857 if (isStaticEnumField(v)) { 3858 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3859 3860 if (enclClass == null || enclClass.owner == null) 3861 return; 3862 3863 // See if the enclosing class is the enum (or a 3864 // subclass thereof) declaring v. If not, this 3865 // reference is OK. 3866 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3867 return; 3868 3869 // If the reference isn't from an initializer, then 3870 // the reference is OK. 3871 if (!Resolve.isInitializer(env)) 3872 return; 3873 3874 log.error(tree.pos(), "illegal.enum.static.ref"); 3875 } 3876 } 3877 3878 /** Is the given symbol a static, non-constant field of an Enum? 3879 * Note: enum literals should not be regarded as such 3880 */ 3881 private boolean isStaticEnumField(VarSymbol v) { 3882 return Flags.isEnum(v.owner) && 3883 Flags.isStatic(v) && 3884 !Flags.isConstant(v) && 3885 v.name != names._class; 3886 } 3887 3888 /** 3889 * Check that method arguments conform to its instantiation. 3890 **/ 3891 public Type checkMethod(Type site, 3892 final Symbol sym, 3893 ResultInfo resultInfo, 3894 Env<AttrContext> env, 3895 final List<JCExpression> argtrees, 3896 List<Type> argtypes, 3897 List<Type> typeargtypes) { 3898 // Test (5): if symbol is an instance method of a raw type, issue 3899 // an unchecked warning if its argument types change under erasure. 3900 if ((sym.flags() & STATIC) == 0 && 3901 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3902 Type s = types.asOuterSuper(site, sym.owner); 3903 if (s != null && s.isRaw() && 3904 !types.isSameTypes(sym.type.getParameterTypes(), 3905 sym.erasure(types).getParameterTypes())) { 3906 chk.warnUnchecked(env.tree.pos(), 3907 "unchecked.call.mbr.of.raw.type", 3908 sym, s); 3909 } 3910 } 3911 3912 if (env.info.defaultSuperCallSite != null) { 3913 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3914 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3915 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3916 List<MethodSymbol> icand_sup = 3917 types.interfaceCandidates(sup, (MethodSymbol)sym); 3918 if (icand_sup.nonEmpty() && 3919 icand_sup.head != sym && 3920 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3921 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3922 diags.fragment("overridden.default", sym, sup)); 3923 break; 3924 } 3925 } 3926 env.info.defaultSuperCallSite = null; 3927 } 3928 3929 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3930 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3931 if (app.meth.hasTag(SELECT) && 3932 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3933 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3934 } 3935 } 3936 3937 // Compute the identifier's instantiated type. 3938 // For methods, we need to compute the instance type by 3939 // Resolve.instantiate from the symbol's type as well as 3940 // any type arguments and value arguments. 3941 Warner noteWarner = new Warner(); 3942 try { 3943 Type owntype = rs.checkMethod( 3944 env, 3945 site, 3946 sym, 3947 resultInfo, 3948 argtypes, 3949 typeargtypes, 3950 noteWarner); 3951 3952 DeferredAttr.DeferredTypeMap checkDeferredMap = 3953 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3954 3955 argtypes = argtypes.map(checkDeferredMap); 3956 3957 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3958 chk.warnUnchecked(env.tree.pos(), 3959 "unchecked.meth.invocation.applied", 3960 kindName(sym), 3961 sym.name, 3962 rs.methodArguments(sym.type.getParameterTypes()), 3963 rs.methodArguments(argtypes.map(checkDeferredMap)), 3964 kindName(sym.location()), 3965 sym.location()); 3966 owntype = new MethodType(owntype.getParameterTypes(), 3967 types.erasure(owntype.getReturnType()), 3968 types.erasure(owntype.getThrownTypes()), 3969 syms.methodClass); 3970 } 3971 3972 PolyKind pkind = (sym.type.hasTag(FORALL) && 3973 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 3974 PolyKind.POLY : PolyKind.STANDALONE; 3975 TreeInfo.setPolyKind(env.tree, pkind); 3976 3977 return (resultInfo.pt == Infer.anyPoly) ? 3978 owntype : 3979 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 3980 resultInfo.checkContext.inferenceContext()); 3981 } catch (Infer.InferenceException ex) { 3982 //invalid target type - propagate exception outwards or report error 3983 //depending on the current check context 3984 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 3985 return types.createErrorType(site); 3986 } catch (Resolve.InapplicableMethodException ex) { 3987 final JCDiagnostic diag = ex.getDiagnostic(); 3988 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 3989 @Override 3990 protected Pair<Symbol, JCDiagnostic> errCandidate() { 3991 return new Pair<>(sym, diag); 3992 } 3993 }; 3994 List<Type> argtypes2 = argtypes.map( 3995 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3996 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 3997 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 3998 log.report(errDiag); 3999 return types.createErrorType(site); 4000 } 4001 } 4002 4003 public void visitLiteral(JCLiteral tree) { 4004 result = check(tree, litType(tree.typetag).constType(tree.value), 4005 KindSelector.VAL, resultInfo); 4006 } 4007 //where 4008 /** Return the type of a literal with given type tag. 4009 */ 4010 Type litType(TypeTag tag) { 4011 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4012 } 4013 4014 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4015 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4016 } 4017 4018 public void visitTypeArray(JCArrayTypeTree tree) { 4019 Type etype = attribType(tree.elemtype, env); 4020 Type type = new ArrayType(etype, syms.arrayClass); 4021 result = check(tree, type, KindSelector.TYP, resultInfo); 4022 } 4023 4024 /** Visitor method for parameterized types. 4025 * Bound checking is left until later, since types are attributed 4026 * before supertype structure is completely known 4027 */ 4028 public void visitTypeApply(JCTypeApply tree) { 4029 Type owntype = types.createErrorType(tree.type); 4030 4031 // Attribute functor part of application and make sure it's a class. 4032 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4033 4034 // Attribute type parameters 4035 List<Type> actuals = attribTypes(tree.arguments, env); 4036 4037 if (clazztype.hasTag(CLASS)) { 4038 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4039 if (actuals.isEmpty()) //diamond 4040 actuals = formals; 4041 4042 if (actuals.length() == formals.length()) { 4043 List<Type> a = actuals; 4044 List<Type> f = formals; 4045 while (a.nonEmpty()) { 4046 a.head = a.head.withTypeVar(f.head); 4047 a = a.tail; 4048 f = f.tail; 4049 } 4050 // Compute the proper generic outer 4051 Type clazzOuter = clazztype.getEnclosingType(); 4052 if (clazzOuter.hasTag(CLASS)) { 4053 Type site; 4054 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4055 if (clazz.hasTag(IDENT)) { 4056 site = env.enclClass.sym.type; 4057 } else if (clazz.hasTag(SELECT)) { 4058 site = ((JCFieldAccess) clazz).selected.type; 4059 } else throw new AssertionError(""+tree); 4060 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4061 if (site.hasTag(CLASS)) 4062 site = types.asOuterSuper(site, clazzOuter.tsym); 4063 if (site == null) 4064 site = types.erasure(clazzOuter); 4065 clazzOuter = site; 4066 } 4067 } 4068 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4069 clazztype.getMetadata()); 4070 } else { 4071 if (formals.length() != 0) { 4072 log.error(tree.pos(), "wrong.number.type.args", 4073 Integer.toString(formals.length())); 4074 } else { 4075 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4076 } 4077 owntype = types.createErrorType(tree.type); 4078 } 4079 } 4080 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4081 } 4082 4083 public void visitTypeUnion(JCTypeUnion tree) { 4084 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4085 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4086 for (JCExpression typeTree : tree.alternatives) { 4087 Type ctype = attribType(typeTree, env); 4088 ctype = chk.checkType(typeTree.pos(), 4089 chk.checkClassType(typeTree.pos(), ctype), 4090 syms.throwableType); 4091 if (!ctype.isErroneous()) { 4092 //check that alternatives of a union type are pairwise 4093 //unrelated w.r.t. subtyping 4094 if (chk.intersects(ctype, multicatchTypes.toList())) { 4095 for (Type t : multicatchTypes) { 4096 boolean sub = types.isSubtype(ctype, t); 4097 boolean sup = types.isSubtype(t, ctype); 4098 if (sub || sup) { 4099 //assume 'a' <: 'b' 4100 Type a = sub ? ctype : t; 4101 Type b = sub ? t : ctype; 4102 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4103 } 4104 } 4105 } 4106 multicatchTypes.append(ctype); 4107 if (all_multicatchTypes != null) 4108 all_multicatchTypes.append(ctype); 4109 } else { 4110 if (all_multicatchTypes == null) { 4111 all_multicatchTypes = new ListBuffer<>(); 4112 all_multicatchTypes.appendList(multicatchTypes); 4113 } 4114 all_multicatchTypes.append(ctype); 4115 } 4116 } 4117 Type t = check(tree, types.lub(multicatchTypes.toList()), 4118 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4119 if (t.hasTag(CLASS)) { 4120 List<Type> alternatives = 4121 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4122 t = new UnionClassType((ClassType) t, alternatives); 4123 } 4124 tree.type = result = t; 4125 } 4126 4127 public void visitTypeIntersection(JCTypeIntersection tree) { 4128 attribTypes(tree.bounds, env); 4129 tree.type = result = checkIntersection(tree, tree.bounds); 4130 } 4131 4132 public void visitTypeParameter(JCTypeParameter tree) { 4133 TypeVar typeVar = (TypeVar) tree.type; 4134 4135 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4136 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4137 } 4138 4139 if (!typeVar.bound.isErroneous()) { 4140 //fixup type-parameter bound computed in 'attribTypeVariables' 4141 typeVar.bound = checkIntersection(tree, tree.bounds); 4142 } 4143 } 4144 4145 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4146 Set<Type> boundSet = new HashSet<>(); 4147 if (bounds.nonEmpty()) { 4148 // accept class or interface or typevar as first bound. 4149 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4150 boundSet.add(types.erasure(bounds.head.type)); 4151 if (bounds.head.type.isErroneous()) { 4152 return bounds.head.type; 4153 } 4154 else if (bounds.head.type.hasTag(TYPEVAR)) { 4155 // if first bound was a typevar, do not accept further bounds. 4156 if (bounds.tail.nonEmpty()) { 4157 log.error(bounds.tail.head.pos(), 4158 "type.var.may.not.be.followed.by.other.bounds"); 4159 return bounds.head.type; 4160 } 4161 } else { 4162 // if first bound was a class or interface, accept only interfaces 4163 // as further bounds. 4164 for (JCExpression bound : bounds.tail) { 4165 bound.type = checkBase(bound.type, bound, env, false, true, false); 4166 if (bound.type.isErroneous()) { 4167 bounds = List.of(bound); 4168 } 4169 else if (bound.type.hasTag(CLASS)) { 4170 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4171 } 4172 } 4173 } 4174 } 4175 4176 if (bounds.length() == 0) { 4177 return syms.objectType; 4178 } else if (bounds.length() == 1) { 4179 return bounds.head.type; 4180 } else { 4181 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4182 // ... the variable's bound is a class type flagged COMPOUND 4183 // (see comment for TypeVar.bound). 4184 // In this case, generate a class tree that represents the 4185 // bound class, ... 4186 JCExpression extending; 4187 List<JCExpression> implementing; 4188 if (!bounds.head.type.isInterface()) { 4189 extending = bounds.head; 4190 implementing = bounds.tail; 4191 } else { 4192 extending = null; 4193 implementing = bounds; 4194 } 4195 JCClassDecl cd = make.at(tree).ClassDef( 4196 make.Modifiers(PUBLIC | ABSTRACT), 4197 names.empty, List.<JCTypeParameter>nil(), 4198 extending, implementing, List.<JCTree>nil()); 4199 4200 ClassSymbol c = (ClassSymbol)owntype.tsym; 4201 Assert.check((c.flags() & COMPOUND) != 0); 4202 cd.sym = c; 4203 c.sourcefile = env.toplevel.sourcefile; 4204 4205 // ... and attribute the bound class 4206 c.flags_field |= UNATTRIBUTED; 4207 Env<AttrContext> cenv = enter.classEnv(cd, env); 4208 typeEnvs.put(c, cenv); 4209 attribClass(c); 4210 return owntype; 4211 } 4212 } 4213 4214 public void visitWildcard(JCWildcard tree) { 4215 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4216 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4217 ? syms.objectType 4218 : attribType(tree.inner, env); 4219 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4220 tree.kind.kind, 4221 syms.boundClass), 4222 KindSelector.TYP, resultInfo); 4223 } 4224 4225 public void visitAnnotation(JCAnnotation tree) { 4226 Assert.error("should be handled in annotate"); 4227 } 4228 4229 public void visitAnnotatedType(JCAnnotatedType tree) { 4230 attribAnnotationTypes(tree.annotations, env); 4231 Type underlyingType = attribType(tree.underlyingType, env); 4232 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4233 4234 if (!env.info.isNewClass) 4235 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4236 result = tree.type = annotatedType; 4237 } 4238 4239 public void visitErroneous(JCErroneous tree) { 4240 if (tree.errs != null) 4241 for (JCTree err : tree.errs) 4242 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4243 result = tree.type = syms.errType; 4244 } 4245 4246 /** Default visitor method for all other trees. 4247 */ 4248 public void visitTree(JCTree tree) { 4249 throw new AssertionError(); 4250 } 4251 4252 /** 4253 * Attribute an env for either a top level tree or class or module declaration. 4254 */ 4255 public void attrib(Env<AttrContext> env) { 4256 switch (env.tree.getTag()) { 4257 case MODULEDEF: 4258 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4259 break; 4260 case TOPLEVEL: 4261 attribTopLevel(env); 4262 break; 4263 default: 4264 attribClass(env.tree.pos(), env.enclClass.sym); 4265 } 4266 } 4267 4268 /** 4269 * Attribute a top level tree. These trees are encountered when the 4270 * package declaration has annotations. 4271 */ 4272 public void attribTopLevel(Env<AttrContext> env) { 4273 JCCompilationUnit toplevel = env.toplevel; 4274 try { 4275 annotate.flush(); 4276 } catch (CompletionFailure ex) { 4277 chk.completionError(toplevel.pos(), ex); 4278 } 4279 } 4280 4281 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4282 try { 4283 annotate.flush(); 4284 attribModule(m); 4285 } catch (CompletionFailure ex) { 4286 chk.completionError(pos, ex); 4287 } 4288 } 4289 4290 void attribModule(ModuleSymbol m) { 4291 // Get environment current at the point of module definition. 4292 Env<AttrContext> env = enter.typeEnvs.get(m); 4293 attribStat(env.tree, env); 4294 } 4295 4296 /** Main method: attribute class definition associated with given class symbol. 4297 * reporting completion failures at the given position. 4298 * @param pos The source position at which completion errors are to be 4299 * reported. 4300 * @param c The class symbol whose definition will be attributed. 4301 */ 4302 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4303 try { 4304 annotate.flush(); 4305 attribClass(c); 4306 } catch (CompletionFailure ex) { 4307 chk.completionError(pos, ex); 4308 } 4309 } 4310 4311 /** Attribute class definition associated with given class symbol. 4312 * @param c The class symbol whose definition will be attributed. 4313 */ 4314 void attribClass(ClassSymbol c) throws CompletionFailure { 4315 if (c.type.hasTag(ERROR)) return; 4316 4317 // Check for cycles in the inheritance graph, which can arise from 4318 // ill-formed class files. 4319 chk.checkNonCyclic(null, c.type); 4320 4321 Type st = types.supertype(c.type); 4322 if ((c.flags_field & Flags.COMPOUND) == 0) { 4323 // First, attribute superclass. 4324 if (st.hasTag(CLASS)) 4325 attribClass((ClassSymbol)st.tsym); 4326 4327 // Next attribute owner, if it is a class. 4328 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4329 attribClass((ClassSymbol)c.owner); 4330 } 4331 4332 // The previous operations might have attributed the current class 4333 // if there was a cycle. So we test first whether the class is still 4334 // UNATTRIBUTED. 4335 if ((c.flags_field & UNATTRIBUTED) != 0) { 4336 c.flags_field &= ~UNATTRIBUTED; 4337 4338 // Get environment current at the point of class definition. 4339 Env<AttrContext> env = typeEnvs.get(c); 4340 4341 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4342 // because the annotations were not available at the time the env was created. Therefore, 4343 // we look up the environment chain for the first enclosing environment for which the 4344 // lint value is set. Typically, this is the parent env, but might be further if there 4345 // are any envs created as a result of TypeParameter nodes. 4346 Env<AttrContext> lintEnv = env; 4347 while (lintEnv.info.lint == null) 4348 lintEnv = lintEnv.next; 4349 4350 // Having found the enclosing lint value, we can initialize the lint value for this class 4351 env.info.lint = lintEnv.info.lint.augment(c); 4352 4353 Lint prevLint = chk.setLint(env.info.lint); 4354 JavaFileObject prev = log.useSource(c.sourcefile); 4355 ResultInfo prevReturnRes = env.info.returnResult; 4356 4357 try { 4358 deferredLintHandler.flush(env.tree); 4359 env.info.returnResult = null; 4360 // java.lang.Enum may not be subclassed by a non-enum 4361 if (st.tsym == syms.enumSym && 4362 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4363 log.error(env.tree.pos(), "enum.no.subclassing"); 4364 4365 // Enums may not be extended by source-level classes 4366 if (st.tsym != null && 4367 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4368 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4369 log.error(env.tree.pos(), "enum.types.not.extensible"); 4370 } 4371 4372 if (isSerializable(c.type)) { 4373 env.info.isSerializable = true; 4374 } 4375 4376 attribClassBody(env, c); 4377 4378 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4379 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4380 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4381 } finally { 4382 env.info.returnResult = prevReturnRes; 4383 log.useSource(prev); 4384 chk.setLint(prevLint); 4385 } 4386 4387 } 4388 } 4389 4390 public void visitImport(JCImport tree) { 4391 // nothing to do 4392 } 4393 4394 public void visitModuleDef(JCModuleDecl tree) { 4395 tree.sym.completeUsesProvides(); 4396 } 4397 4398 /** Finish the attribution of a class. */ 4399 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4400 JCClassDecl tree = (JCClassDecl)env.tree; 4401 Assert.check(c == tree.sym); 4402 4403 // Validate type parameters, supertype and interfaces. 4404 attribStats(tree.typarams, env); 4405 if (!c.isAnonymous()) { 4406 //already checked if anonymous 4407 chk.validate(tree.typarams, env); 4408 chk.validate(tree.extending, env); 4409 chk.validate(tree.implementing, env); 4410 } 4411 4412 c.markAbstractIfNeeded(types); 4413 4414 // If this is a non-abstract class, check that it has no abstract 4415 // methods or unimplemented methods of an implemented interface. 4416 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4417 chk.checkAllDefined(tree.pos(), c); 4418 } 4419 4420 if ((c.flags() & ANNOTATION) != 0) { 4421 if (tree.implementing.nonEmpty()) 4422 log.error(tree.implementing.head.pos(), 4423 "cant.extend.intf.annotation"); 4424 if (tree.typarams.nonEmpty()) 4425 log.error(tree.typarams.head.pos(), 4426 "intf.annotation.cant.have.type.params"); 4427 4428 // If this annotation type has a @Repeatable, validate 4429 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4430 // If this annotation type has a @Repeatable, validate 4431 if (repeatable != null) { 4432 // get diagnostic position for error reporting 4433 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4434 Assert.checkNonNull(cbPos); 4435 4436 chk.validateRepeatable(c, repeatable, cbPos); 4437 } 4438 } else { 4439 // Check that all extended classes and interfaces 4440 // are compatible (i.e. no two define methods with same arguments 4441 // yet different return types). (JLS 8.4.6.3) 4442 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4443 if (allowDefaultMethods) { 4444 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4445 } 4446 } 4447 4448 // Check that class does not import the same parameterized interface 4449 // with two different argument lists. 4450 chk.checkClassBounds(tree.pos(), c.type); 4451 4452 tree.type = c.type; 4453 4454 for (List<JCTypeParameter> l = tree.typarams; 4455 l.nonEmpty(); l = l.tail) { 4456 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4457 } 4458 4459 // Check that a generic class doesn't extend Throwable 4460 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4461 log.error(tree.extending.pos(), "generic.throwable"); 4462 4463 // Check that all methods which implement some 4464 // method conform to the method they implement. 4465 chk.checkImplementations(tree); 4466 4467 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4468 checkAutoCloseable(tree.pos(), env, c.type); 4469 4470 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4471 // Attribute declaration 4472 attribStat(l.head, env); 4473 // Check that declarations in inner classes are not static (JLS 8.1.2) 4474 // Make an exception for static constants. 4475 if (c.owner.kind != PCK && 4476 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4477 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4478 Symbol sym = null; 4479 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4480 if (sym == null || 4481 sym.kind != VAR || 4482 ((VarSymbol) sym).getConstValue() == null) 4483 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4484 } 4485 } 4486 4487 // Check for cycles among non-initial constructors. 4488 chk.checkCyclicConstructors(tree); 4489 4490 // Check for cycles among annotation elements. 4491 chk.checkNonCyclicElements(tree); 4492 4493 // Check for proper use of serialVersionUID 4494 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4495 && isSerializable(c.type) 4496 && (c.flags() & Flags.ENUM) == 0 4497 && !c.isAnonymous() 4498 && checkForSerial(c)) { 4499 checkSerialVersionUID(tree, c); 4500 } 4501 if (allowTypeAnnos) { 4502 // Correctly organize the postions of the type annotations 4503 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4504 4505 // Check type annotations applicability rules 4506 validateTypeAnnotations(tree, false); 4507 } 4508 } 4509 // where 4510 boolean checkForSerial(ClassSymbol c) { 4511 if ((c.flags() & ABSTRACT) == 0) { 4512 return true; 4513 } else { 4514 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4515 } 4516 } 4517 4518 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() { 4519 @Override 4520 public boolean accepts(Symbol s) { 4521 return s.kind == MTH && 4522 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4523 } 4524 }; 4525 4526 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4527 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4528 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4529 if (types.isSameType(al.head.annotationType.type, t)) 4530 return al.head.pos(); 4531 } 4532 4533 return null; 4534 } 4535 4536 /** check if a type is a subtype of Serializable, if that is available. */ 4537 boolean isSerializable(Type t) { 4538 try { 4539 syms.serializableType.complete(); 4540 } 4541 catch (CompletionFailure e) { 4542 return false; 4543 } 4544 return types.isSubtype(t, syms.serializableType); 4545 } 4546 4547 /** Check that an appropriate serialVersionUID member is defined. */ 4548 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4549 4550 // check for presence of serialVersionUID 4551 VarSymbol svuid = null; 4552 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4553 if (sym.kind == VAR) { 4554 svuid = (VarSymbol)sym; 4555 break; 4556 } 4557 } 4558 4559 if (svuid == null) { 4560 log.warning(LintCategory.SERIAL, 4561 tree.pos(), "missing.SVUID", c); 4562 return; 4563 } 4564 4565 // check that it is static final 4566 if ((svuid.flags() & (STATIC | FINAL)) != 4567 (STATIC | FINAL)) 4568 log.warning(LintCategory.SERIAL, 4569 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4570 4571 // check that it is long 4572 else if (!svuid.type.hasTag(LONG)) 4573 log.warning(LintCategory.SERIAL, 4574 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4575 4576 // check constant 4577 else if (svuid.getConstValue() == null) 4578 log.warning(LintCategory.SERIAL, 4579 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4580 } 4581 4582 private Type capture(Type type) { 4583 return types.capture(type); 4584 } 4585 4586 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4587 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4588 } 4589 //where 4590 private final class TypeAnnotationsValidator extends TreeScanner { 4591 4592 private final boolean sigOnly; 4593 public TypeAnnotationsValidator(boolean sigOnly) { 4594 this.sigOnly = sigOnly; 4595 } 4596 4597 public void visitAnnotation(JCAnnotation tree) { 4598 chk.validateTypeAnnotation(tree, false); 4599 super.visitAnnotation(tree); 4600 } 4601 public void visitAnnotatedType(JCAnnotatedType tree) { 4602 if (!tree.underlyingType.type.isErroneous()) { 4603 super.visitAnnotatedType(tree); 4604 } 4605 } 4606 public void visitTypeParameter(JCTypeParameter tree) { 4607 chk.validateTypeAnnotations(tree.annotations, true); 4608 scan(tree.bounds); 4609 // Don't call super. 4610 // This is needed because above we call validateTypeAnnotation with 4611 // false, which would forbid annotations on type parameters. 4612 // super.visitTypeParameter(tree); 4613 } 4614 public void visitMethodDef(JCMethodDecl tree) { 4615 if (tree.recvparam != null && 4616 !tree.recvparam.vartype.type.isErroneous()) { 4617 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4618 tree.recvparam.vartype.type.tsym); 4619 } 4620 if (tree.restype != null && tree.restype.type != null) { 4621 validateAnnotatedType(tree.restype, tree.restype.type); 4622 } 4623 if (sigOnly) { 4624 scan(tree.mods); 4625 scan(tree.restype); 4626 scan(tree.typarams); 4627 scan(tree.recvparam); 4628 scan(tree.params); 4629 scan(tree.thrown); 4630 } else { 4631 scan(tree.defaultValue); 4632 scan(tree.body); 4633 } 4634 } 4635 public void visitVarDef(final JCVariableDecl tree) { 4636 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4637 if (tree.sym != null && tree.sym.type != null) 4638 validateAnnotatedType(tree.vartype, tree.sym.type); 4639 scan(tree.mods); 4640 scan(tree.vartype); 4641 if (!sigOnly) { 4642 scan(tree.init); 4643 } 4644 } 4645 public void visitTypeCast(JCTypeCast tree) { 4646 if (tree.clazz != null && tree.clazz.type != null) 4647 validateAnnotatedType(tree.clazz, tree.clazz.type); 4648 super.visitTypeCast(tree); 4649 } 4650 public void visitTypeTest(JCInstanceOf tree) { 4651 if (tree.clazz != null && tree.clazz.type != null) 4652 validateAnnotatedType(tree.clazz, tree.clazz.type); 4653 super.visitTypeTest(tree); 4654 } 4655 public void visitNewClass(JCNewClass tree) { 4656 if (tree.clazz != null && tree.clazz.type != null) { 4657 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4658 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4659 tree.clazz.type.tsym); 4660 } 4661 if (tree.def != null) { 4662 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4663 } 4664 4665 validateAnnotatedType(tree.clazz, tree.clazz.type); 4666 } 4667 super.visitNewClass(tree); 4668 } 4669 public void visitNewArray(JCNewArray tree) { 4670 if (tree.elemtype != null && tree.elemtype.type != null) { 4671 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4672 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4673 tree.elemtype.type.tsym); 4674 } 4675 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4676 } 4677 super.visitNewArray(tree); 4678 } 4679 public void visitClassDef(JCClassDecl tree) { 4680 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4681 if (sigOnly) { 4682 scan(tree.mods); 4683 scan(tree.typarams); 4684 scan(tree.extending); 4685 scan(tree.implementing); 4686 } 4687 for (JCTree member : tree.defs) { 4688 if (member.hasTag(Tag.CLASSDEF)) { 4689 continue; 4690 } 4691 scan(member); 4692 } 4693 } 4694 public void visitBlock(JCBlock tree) { 4695 if (!sigOnly) { 4696 scan(tree.stats); 4697 } 4698 } 4699 4700 /* I would want to model this after 4701 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4702 * and override visitSelect and visitTypeApply. 4703 * However, we only set the annotated type in the top-level type 4704 * of the symbol. 4705 * Therefore, we need to override each individual location where a type 4706 * can occur. 4707 */ 4708 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4709 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4710 4711 if (type.isPrimitiveOrVoid()) { 4712 return; 4713 } 4714 4715 JCTree enclTr = errtree; 4716 Type enclTy = type; 4717 4718 boolean repeat = true; 4719 while (repeat) { 4720 if (enclTr.hasTag(TYPEAPPLY)) { 4721 List<Type> tyargs = enclTy.getTypeArguments(); 4722 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4723 if (trargs.length() > 0) { 4724 // Nothing to do for diamonds 4725 if (tyargs.length() == trargs.length()) { 4726 for (int i = 0; i < tyargs.length(); ++i) { 4727 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4728 } 4729 } 4730 // If the lengths don't match, it's either a diamond 4731 // or some nested type that redundantly provides 4732 // type arguments in the tree. 4733 } 4734 4735 // Look at the clazz part of a generic type 4736 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4737 } 4738 4739 if (enclTr.hasTag(SELECT)) { 4740 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4741 if (enclTy != null && 4742 !enclTy.hasTag(NONE)) { 4743 enclTy = enclTy.getEnclosingType(); 4744 } 4745 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4746 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4747 if (enclTy == null || enclTy.hasTag(NONE)) { 4748 if (at.getAnnotations().size() == 1) { 4749 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4750 } else { 4751 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4752 for (JCAnnotation an : at.getAnnotations()) { 4753 comps.add(an.attribute); 4754 } 4755 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4756 } 4757 repeat = false; 4758 } 4759 enclTr = at.underlyingType; 4760 // enclTy doesn't need to be changed 4761 } else if (enclTr.hasTag(IDENT)) { 4762 repeat = false; 4763 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4764 JCWildcard wc = (JCWildcard) enclTr; 4765 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4766 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4767 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4768 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4769 } else { 4770 // Nothing to do for UNBOUND 4771 } 4772 repeat = false; 4773 } else if (enclTr.hasTag(TYPEARRAY)) { 4774 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4775 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4776 repeat = false; 4777 } else if (enclTr.hasTag(TYPEUNION)) { 4778 JCTypeUnion ut = (JCTypeUnion) enclTr; 4779 for (JCTree t : ut.getTypeAlternatives()) { 4780 validateAnnotatedType(t, t.type); 4781 } 4782 repeat = false; 4783 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4784 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4785 for (JCTree t : it.getBounds()) { 4786 validateAnnotatedType(t, t.type); 4787 } 4788 repeat = false; 4789 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4790 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4791 repeat = false; 4792 } else { 4793 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4794 " within: "+ errtree + " with kind: " + errtree.getKind()); 4795 } 4796 } 4797 } 4798 4799 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4800 Symbol sym) { 4801 // Ensure that no declaration annotations are present. 4802 // Note that a tree type might be an AnnotatedType with 4803 // empty annotations, if only declaration annotations were given. 4804 // This method will raise an error for such a type. 4805 for (JCAnnotation ai : annotations) { 4806 if (!ai.type.isErroneous() && 4807 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4808 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4809 } 4810 } 4811 } 4812 } 4813 4814 // <editor-fold desc="post-attribution visitor"> 4815 4816 /** 4817 * Handle missing types/symbols in an AST. This routine is useful when 4818 * the compiler has encountered some errors (which might have ended up 4819 * terminating attribution abruptly); if the compiler is used in fail-over 4820 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4821 * prevents NPE to be progagated during subsequent compilation steps. 4822 */ 4823 public void postAttr(JCTree tree) { 4824 new PostAttrAnalyzer().scan(tree); 4825 } 4826 4827 class PostAttrAnalyzer extends TreeScanner { 4828 4829 private void initTypeIfNeeded(JCTree that) { 4830 if (that.type == null) { 4831 if (that.hasTag(METHODDEF)) { 4832 that.type = dummyMethodType((JCMethodDecl)that); 4833 } else { 4834 that.type = syms.unknownType; 4835 } 4836 } 4837 } 4838 4839 /* Construct a dummy method type. If we have a method declaration, 4840 * and the declared return type is void, then use that return type 4841 * instead of UNKNOWN to avoid spurious error messages in lambda 4842 * bodies (see:JDK-8041704). 4843 */ 4844 private Type dummyMethodType(JCMethodDecl md) { 4845 Type restype = syms.unknownType; 4846 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4847 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4848 if (prim.typetag == VOID) 4849 restype = syms.voidType; 4850 } 4851 return new MethodType(List.<Type>nil(), restype, 4852 List.<Type>nil(), syms.methodClass); 4853 } 4854 private Type dummyMethodType() { 4855 return dummyMethodType(null); 4856 } 4857 4858 @Override 4859 public void scan(JCTree tree) { 4860 if (tree == null) return; 4861 if (tree instanceof JCExpression) { 4862 initTypeIfNeeded(tree); 4863 } 4864 super.scan(tree); 4865 } 4866 4867 @Override 4868 public void visitIdent(JCIdent that) { 4869 if (that.sym == null) { 4870 that.sym = syms.unknownSymbol; 4871 } 4872 } 4873 4874 @Override 4875 public void visitSelect(JCFieldAccess that) { 4876 if (that.sym == null) { 4877 that.sym = syms.unknownSymbol; 4878 } 4879 super.visitSelect(that); 4880 } 4881 4882 @Override 4883 public void visitClassDef(JCClassDecl that) { 4884 initTypeIfNeeded(that); 4885 if (that.sym == null) { 4886 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4887 } 4888 super.visitClassDef(that); 4889 } 4890 4891 @Override 4892 public void visitMethodDef(JCMethodDecl that) { 4893 initTypeIfNeeded(that); 4894 if (that.sym == null) { 4895 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4896 } 4897 super.visitMethodDef(that); 4898 } 4899 4900 @Override 4901 public void visitVarDef(JCVariableDecl that) { 4902 initTypeIfNeeded(that); 4903 if (that.sym == null) { 4904 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4905 that.sym.adr = 0; 4906 } 4907 super.visitVarDef(that); 4908 } 4909 4910 @Override 4911 public void visitNewClass(JCNewClass that) { 4912 if (that.constructor == null) { 4913 that.constructor = new MethodSymbol(0, names.init, 4914 dummyMethodType(), syms.noSymbol); 4915 } 4916 if (that.constructorType == null) { 4917 that.constructorType = syms.unknownType; 4918 } 4919 super.visitNewClass(that); 4920 } 4921 4922 @Override 4923 public void visitAssignop(JCAssignOp that) { 4924 if (that.operator == null) { 4925 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4926 -1, syms.noSymbol); 4927 } 4928 super.visitAssignop(that); 4929 } 4930 4931 @Override 4932 public void visitBinary(JCBinary that) { 4933 if (that.operator == null) { 4934 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4935 -1, syms.noSymbol); 4936 } 4937 super.visitBinary(that); 4938 } 4939 4940 @Override 4941 public void visitUnary(JCUnary that) { 4942 if (that.operator == null) { 4943 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4944 -1, syms.noSymbol); 4945 } 4946 super.visitUnary(that); 4947 } 4948 4949 @Override 4950 public void visitLambda(JCLambda that) { 4951 super.visitLambda(that); 4952 if (that.targets == null) { 4953 that.targets = List.nil(); 4954 } 4955 } 4956 4957 @Override 4958 public void visitReference(JCMemberReference that) { 4959 super.visitReference(that); 4960 if (that.sym == null) { 4961 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 4962 syms.noSymbol); 4963 } 4964 if (that.targets == null) { 4965 that.targets = List.nil(); 4966 } 4967 } 4968 } 4969 // </editor-fold> 4970 4971 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 4972 new TreeScanner() { 4973 Symbol packge = pkg; 4974 @Override 4975 public void visitIdent(JCIdent that) { 4976 that.sym = packge; 4977 } 4978 4979 @Override 4980 public void visitSelect(JCFieldAccess that) { 4981 that.sym = packge; 4982 packge = packge.owner; 4983 super.visitSelect(that); 4984 } 4985 }.scan(pid); 4986 } 4987 4988} 4989