Attr.java revision 4077:24582dd2649a
1/* 2 * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.*; 29 30import javax.lang.model.element.ElementKind; 31import javax.tools.JavaFileObject; 32 33import com.sun.source.tree.IdentifierTree; 34import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 35import com.sun.source.tree.MemberSelectTree; 36import com.sun.source.tree.TreeVisitor; 37import com.sun.source.util.SimpleTreeVisitor; 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Directive.RequiresFlag; 40import com.sun.tools.javac.code.Lint.LintCategory; 41import com.sun.tools.javac.code.Scope.WriteableScope; 42import com.sun.tools.javac.code.Symbol.*; 43import com.sun.tools.javac.code.Type.*; 44import com.sun.tools.javac.code.TypeMetadata.Annotations; 45import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 46import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext; 47import com.sun.tools.javac.comp.Check.CheckContext; 48import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 49import com.sun.tools.javac.comp.Infer.FreeTypeListener; 50import com.sun.tools.javac.jvm.*; 51import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 52import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 53import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 54import com.sun.tools.javac.resources.CompilerProperties.Errors; 55import com.sun.tools.javac.resources.CompilerProperties.Fragments; 56import com.sun.tools.javac.tree.*; 57import com.sun.tools.javac.tree.JCTree.*; 58import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 59import com.sun.tools.javac.util.*; 60import com.sun.tools.javac.util.DefinedBy.Api; 61import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 62import com.sun.tools.javac.util.JCDiagnostic.Fragment; 63import com.sun.tools.javac.util.List; 64 65import static com.sun.tools.javac.code.Flags.*; 66import static com.sun.tools.javac.code.Flags.ANNOTATION; 67import static com.sun.tools.javac.code.Flags.BLOCK; 68import static com.sun.tools.javac.code.Kinds.*; 69import static com.sun.tools.javac.code.Kinds.Kind.*; 70import static com.sun.tools.javac.code.TypeTag.*; 71import static com.sun.tools.javac.code.TypeTag.WILDCARD; 72import static com.sun.tools.javac.tree.JCTree.Tag.*; 73import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag; 74 75/** This is the main context-dependent analysis phase in GJC. It 76 * encompasses name resolution, type checking and constant folding as 77 * subtasks. Some subtasks involve auxiliary classes. 78 * @see Check 79 * @see Resolve 80 * @see ConstFold 81 * @see Infer 82 * 83 * <p><b>This is NOT part of any supported API. 84 * If you write code that depends on this, you do so at your own risk. 85 * This code and its internal interfaces are subject to change or 86 * deletion without notice.</b> 87 */ 88public class Attr extends JCTree.Visitor { 89 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 90 91 final Names names; 92 final Log log; 93 final Symtab syms; 94 final Resolve rs; 95 final Operators operators; 96 final Infer infer; 97 final Analyzer analyzer; 98 final DeferredAttr deferredAttr; 99 final Check chk; 100 final Flow flow; 101 final MemberEnter memberEnter; 102 final TypeEnter typeEnter; 103 final TreeMaker make; 104 final ConstFold cfolder; 105 final Enter enter; 106 final Target target; 107 final Types types; 108 final JCDiagnostic.Factory diags; 109 final TypeAnnotations typeAnnotations; 110 final DeferredLintHandler deferredLintHandler; 111 final TypeEnvs typeEnvs; 112 final Dependencies dependencies; 113 final Annotate annotate; 114 final ArgumentAttr argumentAttr; 115 116 public static Attr instance(Context context) { 117 Attr instance = context.get(attrKey); 118 if (instance == null) 119 instance = new Attr(context); 120 return instance; 121 } 122 123 protected Attr(Context context) { 124 context.put(attrKey, this); 125 126 names = Names.instance(context); 127 log = Log.instance(context); 128 syms = Symtab.instance(context); 129 rs = Resolve.instance(context); 130 operators = Operators.instance(context); 131 chk = Check.instance(context); 132 flow = Flow.instance(context); 133 memberEnter = MemberEnter.instance(context); 134 typeEnter = TypeEnter.instance(context); 135 make = TreeMaker.instance(context); 136 enter = Enter.instance(context); 137 infer = Infer.instance(context); 138 analyzer = Analyzer.instance(context); 139 deferredAttr = DeferredAttr.instance(context); 140 cfolder = ConstFold.instance(context); 141 target = Target.instance(context); 142 types = Types.instance(context); 143 diags = JCDiagnostic.Factory.instance(context); 144 annotate = Annotate.instance(context); 145 typeAnnotations = TypeAnnotations.instance(context); 146 deferredLintHandler = DeferredLintHandler.instance(context); 147 typeEnvs = TypeEnvs.instance(context); 148 dependencies = Dependencies.instance(context); 149 argumentAttr = ArgumentAttr.instance(context); 150 151 Options options = Options.instance(context); 152 153 Source source = Source.instance(context); 154 allowStringsInSwitch = source.allowStringsInSwitch(); 155 allowPoly = source.allowPoly(); 156 allowTypeAnnos = source.allowTypeAnnotations(); 157 allowLambda = source.allowLambda(); 158 allowDefaultMethods = source.allowDefaultMethods(); 159 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 160 sourceName = source.name; 161 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 162 163 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 164 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 165 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 166 methodAttrInfo = new MethodAttrInfo(); 167 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 168 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 169 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 170 } 171 172 /** Switch: support target-typing inference 173 */ 174 boolean allowPoly; 175 176 /** Switch: support type annotations. 177 */ 178 boolean allowTypeAnnos; 179 180 /** Switch: support lambda expressions ? 181 */ 182 boolean allowLambda; 183 184 /** Switch: support default methods ? 185 */ 186 boolean allowDefaultMethods; 187 188 /** Switch: static interface methods enabled? 189 */ 190 boolean allowStaticInterfaceMethods; 191 192 /** 193 * Switch: warn about use of variable before declaration? 194 * RFE: 6425594 195 */ 196 boolean useBeforeDeclarationWarning; 197 198 /** 199 * Switch: allow strings in switch? 200 */ 201 boolean allowStringsInSwitch; 202 203 /** 204 * Switch: name of source level; used for error reporting. 205 */ 206 String sourceName; 207 208 /** Check kind and type of given tree against protokind and prototype. 209 * If check succeeds, store type in tree and return it. 210 * If check fails, store errType in tree and return it. 211 * No checks are performed if the prototype is a method type. 212 * It is not necessary in this case since we know that kind and type 213 * are correct. 214 * 215 * @param tree The tree whose kind and type is checked 216 * @param found The computed type of the tree 217 * @param ownkind The computed kind of the tree 218 * @param resultInfo The expected result of the tree 219 */ 220 Type check(final JCTree tree, 221 final Type found, 222 final KindSelector ownkind, 223 final ResultInfo resultInfo) { 224 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 225 Type owntype; 226 boolean shouldCheck = !found.hasTag(ERROR) && 227 !resultInfo.pt.hasTag(METHOD) && 228 !resultInfo.pt.hasTag(FORALL); 229 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 230 log.error(tree.pos(), "unexpected.type", 231 resultInfo.pkind.kindNames(), 232 ownkind.kindNames()); 233 owntype = types.createErrorType(found); 234 } else if (allowPoly && inferenceContext.free(found)) { 235 //delay the check if there are inference variables in the found type 236 //this means we are dealing with a partially inferred poly expression 237 owntype = shouldCheck ? resultInfo.pt : found; 238 if (resultInfo.checkMode.installPostInferenceHook()) { 239 inferenceContext.addFreeTypeListener(List.of(found), 240 instantiatedContext -> { 241 ResultInfo pendingResult = 242 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 243 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 244 }); 245 } 246 } else { 247 owntype = shouldCheck ? 248 resultInfo.check(tree, found) : 249 found; 250 } 251 if (resultInfo.checkMode.updateTreeType()) { 252 tree.type = owntype; 253 } 254 return owntype; 255 } 256 257 /** Is given blank final variable assignable, i.e. in a scope where it 258 * may be assigned to even though it is final? 259 * @param v The blank final variable. 260 * @param env The current environment. 261 */ 262 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 263 Symbol owner = env.info.scope.owner; 264 // owner refers to the innermost variable, method or 265 // initializer block declaration at this point. 266 return 267 v.owner == owner 268 || 269 ((owner.name == names.init || // i.e. we are in a constructor 270 owner.kind == VAR || // i.e. we are in a variable initializer 271 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 272 && 273 v.owner == owner.owner 274 && 275 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 276 } 277 278 /** Check that variable can be assigned to. 279 * @param pos The current source code position. 280 * @param v The assigned variable 281 * @param base If the variable is referred to in a Select, the part 282 * to the left of the `.', null otherwise. 283 * @param env The current environment. 284 */ 285 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 286 if (v.name == names._this) { 287 log.error(pos, Errors.CantAssignValToThis); 288 } else if ((v.flags() & FINAL) != 0 && 289 ((v.flags() & HASINIT) != 0 290 || 291 !((base == null || 292 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 293 isAssignableAsBlankFinal(v, env)))) { 294 if (v.isResourceVariable()) { //TWR resource 295 log.error(pos, "try.resource.may.not.be.assigned", v); 296 } else { 297 log.error(pos, "cant.assign.val.to.final.var", v); 298 } 299 } 300 } 301 302 /** Does tree represent a static reference to an identifier? 303 * It is assumed that tree is either a SELECT or an IDENT. 304 * We have to weed out selects from non-type names here. 305 * @param tree The candidate tree. 306 */ 307 boolean isStaticReference(JCTree tree) { 308 if (tree.hasTag(SELECT)) { 309 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 310 if (lsym == null || lsym.kind != TYP) { 311 return false; 312 } 313 } 314 return true; 315 } 316 317 /** Is this symbol a type? 318 */ 319 static boolean isType(Symbol sym) { 320 return sym != null && sym.kind == TYP; 321 } 322 323 /** The current `this' symbol. 324 * @param env The current environment. 325 */ 326 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 327 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 328 } 329 330 /** Attribute a parsed identifier. 331 * @param tree Parsed identifier name 332 * @param topLevel The toplevel to use 333 */ 334 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 335 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 336 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 337 syms.errSymbol.name, 338 null, null, null, null); 339 localEnv.enclClass.sym = syms.errSymbol; 340 return attribIdent(tree, localEnv); 341 } 342 343 /** Attribute a parsed identifier. 344 * @param tree Parsed identifier name 345 * @param env The env to use 346 */ 347 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 348 return tree.accept(identAttributer, env); 349 } 350 // where 351 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 352 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 353 @Override @DefinedBy(Api.COMPILER_TREE) 354 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 355 Symbol site = visit(node.getExpression(), env); 356 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN) 357 return site; 358 Name name = (Name)node.getIdentifier(); 359 if (site.kind == PCK) { 360 env.toplevel.packge = (PackageSymbol)site; 361 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 362 KindSelector.TYP_PCK); 363 } else { 364 env.enclClass.sym = (ClassSymbol)site; 365 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 366 } 367 } 368 369 @Override @DefinedBy(Api.COMPILER_TREE) 370 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 371 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 372 } 373 } 374 375 public Type coerce(Type etype, Type ttype) { 376 return cfolder.coerce(etype, ttype); 377 } 378 379 public Type attribType(JCTree node, TypeSymbol sym) { 380 Env<AttrContext> env = typeEnvs.get(sym); 381 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 382 return attribTree(node, localEnv, unknownTypeInfo); 383 } 384 385 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 386 // Attribute qualifying package or class. 387 JCFieldAccess s = (JCFieldAccess)tree.qualid; 388 return attribTree(s.selected, env, 389 new ResultInfo(tree.staticImport ? 390 KindSelector.TYP : KindSelector.TYP_PCK, 391 Type.noType)); 392 } 393 394 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 395 breakTree = tree; 396 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 397 try { 398 attribExpr(expr, env); 399 } catch (BreakAttr b) { 400 return b.env; 401 } catch (AssertionError ae) { 402 if (ae.getCause() instanceof BreakAttr) { 403 return ((BreakAttr)(ae.getCause())).env; 404 } else { 405 throw ae; 406 } 407 } finally { 408 breakTree = null; 409 log.useSource(prev); 410 } 411 return env; 412 } 413 414 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 415 breakTree = tree; 416 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 417 try { 418 attribStat(stmt, env); 419 } catch (BreakAttr b) { 420 return b.env; 421 } catch (AssertionError ae) { 422 if (ae.getCause() instanceof BreakAttr) { 423 return ((BreakAttr)(ae.getCause())).env; 424 } else { 425 throw ae; 426 } 427 } finally { 428 breakTree = null; 429 log.useSource(prev); 430 } 431 return env; 432 } 433 434 private JCTree breakTree = null; 435 436 private static class BreakAttr extends RuntimeException { 437 static final long serialVersionUID = -6924771130405446405L; 438 private Env<AttrContext> env; 439 private BreakAttr(Env<AttrContext> env) { 440 this.env = env; 441 } 442 } 443 444 /** 445 * Mode controlling behavior of Attr.Check 446 */ 447 enum CheckMode { 448 449 NORMAL, 450 451 /** 452 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is 453 * that the captured var cache in {@code InferenceContext} will be used in read-only 454 * mode when performing inference checks. 455 */ 456 NO_TREE_UPDATE { 457 @Override 458 public boolean updateTreeType() { 459 return false; 460 } 461 }, 462 /** 463 * Mode signalling that caller will manage free types in tree decorations. 464 */ 465 NO_INFERENCE_HOOK { 466 @Override 467 public boolean installPostInferenceHook() { 468 return false; 469 } 470 }; 471 472 public boolean updateTreeType() { 473 return true; 474 } 475 public boolean installPostInferenceHook() { 476 return true; 477 } 478 } 479 480 481 class ResultInfo { 482 final KindSelector pkind; 483 final Type pt; 484 final CheckContext checkContext; 485 final CheckMode checkMode; 486 487 ResultInfo(KindSelector pkind, Type pt) { 488 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 489 } 490 491 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 492 this(pkind, pt, chk.basicHandler, checkMode); 493 } 494 495 protected ResultInfo(KindSelector pkind, 496 Type pt, CheckContext checkContext) { 497 this(pkind, pt, checkContext, CheckMode.NORMAL); 498 } 499 500 protected ResultInfo(KindSelector pkind, 501 Type pt, CheckContext checkContext, CheckMode checkMode) { 502 this.pkind = pkind; 503 this.pt = pt; 504 this.checkContext = checkContext; 505 this.checkMode = checkMode; 506 } 507 508 protected void attr(JCTree tree, Env<AttrContext> env) { 509 tree.accept(Attr.this); 510 } 511 512 protected Type check(final DiagnosticPosition pos, final Type found) { 513 return chk.checkType(pos, found, pt, checkContext); 514 } 515 516 protected ResultInfo dup(Type newPt) { 517 return new ResultInfo(pkind, newPt, checkContext, checkMode); 518 } 519 520 protected ResultInfo dup(CheckContext newContext) { 521 return new ResultInfo(pkind, pt, newContext, checkMode); 522 } 523 524 protected ResultInfo dup(Type newPt, CheckContext newContext) { 525 return new ResultInfo(pkind, newPt, newContext, checkMode); 526 } 527 528 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 529 return new ResultInfo(pkind, newPt, newContext, newMode); 530 } 531 532 protected ResultInfo dup(CheckMode newMode) { 533 return new ResultInfo(pkind, pt, checkContext, newMode); 534 } 535 536 @Override 537 public String toString() { 538 if (pt != null) { 539 return pt.toString(); 540 } else { 541 return ""; 542 } 543 } 544 } 545 546 class MethodAttrInfo extends ResultInfo { 547 public MethodAttrInfo() { 548 this(chk.basicHandler); 549 } 550 551 public MethodAttrInfo(CheckContext checkContext) { 552 super(KindSelector.VAL, Infer.anyPoly, checkContext); 553 } 554 555 @Override 556 protected void attr(JCTree tree, Env<AttrContext> env) { 557 result = argumentAttr.attribArg(tree, env); 558 } 559 560 protected ResultInfo dup(Type newPt) { 561 throw new IllegalStateException(); 562 } 563 564 protected ResultInfo dup(CheckContext newContext) { 565 return new MethodAttrInfo(newContext); 566 } 567 568 protected ResultInfo dup(Type newPt, CheckContext newContext) { 569 throw new IllegalStateException(); 570 } 571 572 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 573 throw new IllegalStateException(); 574 } 575 576 protected ResultInfo dup(CheckMode newMode) { 577 throw new IllegalStateException(); 578 } 579 } 580 581 class RecoveryInfo extends ResultInfo { 582 583 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 584 super(KindSelector.VAL, Type.recoveryType, 585 new Check.NestedCheckContext(chk.basicHandler) { 586 @Override 587 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 588 return deferredAttrContext; 589 } 590 @Override 591 public boolean compatible(Type found, Type req, Warner warn) { 592 return true; 593 } 594 @Override 595 public void report(DiagnosticPosition pos, JCDiagnostic details) { 596 chk.basicHandler.report(pos, details); 597 } 598 }); 599 } 600 } 601 602 final ResultInfo statInfo; 603 final ResultInfo varAssignmentInfo; 604 final ResultInfo methodAttrInfo; 605 final ResultInfo unknownExprInfo; 606 final ResultInfo unknownTypeInfo; 607 final ResultInfo unknownTypeExprInfo; 608 final ResultInfo recoveryInfo; 609 610 Type pt() { 611 return resultInfo.pt; 612 } 613 614 KindSelector pkind() { 615 return resultInfo.pkind; 616 } 617 618/* ************************************************************************ 619 * Visitor methods 620 *************************************************************************/ 621 622 /** Visitor argument: the current environment. 623 */ 624 Env<AttrContext> env; 625 626 /** Visitor argument: the currently expected attribution result. 627 */ 628 ResultInfo resultInfo; 629 630 /** Visitor result: the computed type. 631 */ 632 Type result; 633 634 /** Visitor method: attribute a tree, catching any completion failure 635 * exceptions. Return the tree's type. 636 * 637 * @param tree The tree to be visited. 638 * @param env The environment visitor argument. 639 * @param resultInfo The result info visitor argument. 640 */ 641 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 642 Env<AttrContext> prevEnv = this.env; 643 ResultInfo prevResult = this.resultInfo; 644 try { 645 this.env = env; 646 this.resultInfo = resultInfo; 647 resultInfo.attr(tree, env); 648 if (tree == breakTree && 649 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 650 throw new BreakAttr(copyEnv(env)); 651 } 652 return result; 653 } catch (CompletionFailure ex) { 654 tree.type = syms.errType; 655 return chk.completionError(tree.pos(), ex); 656 } finally { 657 this.env = prevEnv; 658 this.resultInfo = prevResult; 659 } 660 } 661 662 Env<AttrContext> copyEnv(Env<AttrContext> env) { 663 Env<AttrContext> newEnv = 664 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 665 if (newEnv.outer != null) { 666 newEnv.outer = copyEnv(newEnv.outer); 667 } 668 return newEnv; 669 } 670 671 WriteableScope copyScope(WriteableScope sc) { 672 WriteableScope newScope = WriteableScope.create(sc.owner); 673 List<Symbol> elemsList = List.nil(); 674 for (Symbol sym : sc.getSymbols()) { 675 elemsList = elemsList.prepend(sym); 676 } 677 for (Symbol s : elemsList) { 678 newScope.enter(s); 679 } 680 return newScope; 681 } 682 683 /** Derived visitor method: attribute an expression tree. 684 */ 685 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 686 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 687 } 688 689 /** Derived visitor method: attribute an expression tree with 690 * no constraints on the computed type. 691 */ 692 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 693 return attribTree(tree, env, unknownExprInfo); 694 } 695 696 /** Derived visitor method: attribute a type tree. 697 */ 698 public Type attribType(JCTree tree, Env<AttrContext> env) { 699 Type result = attribType(tree, env, Type.noType); 700 return result; 701 } 702 703 /** Derived visitor method: attribute a type tree. 704 */ 705 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 706 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 707 return result; 708 } 709 710 /** Derived visitor method: attribute a statement or definition tree. 711 */ 712 public Type attribStat(JCTree tree, Env<AttrContext> env) { 713 Env<AttrContext> analyzeEnv = 714 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 715 try { 716 return attribTree(tree, env, statInfo); 717 } finally { 718 analyzer.analyzeIfNeeded(tree, analyzeEnv); 719 } 720 } 721 722 /** Attribute a list of expressions, returning a list of types. 723 */ 724 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 725 ListBuffer<Type> ts = new ListBuffer<>(); 726 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 727 ts.append(attribExpr(l.head, env, pt)); 728 return ts.toList(); 729 } 730 731 /** Attribute a list of statements, returning nothing. 732 */ 733 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 734 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 735 attribStat(l.head, env); 736 } 737 738 /** Attribute the arguments in a method call, returning the method kind. 739 */ 740 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 741 KindSelector kind = initialKind; 742 for (JCExpression arg : trees) { 743 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 744 if (argtype.hasTag(DEFERRED)) { 745 kind = KindSelector.of(KindSelector.POLY, kind); 746 } 747 argtypes.append(argtype); 748 } 749 return kind; 750 } 751 752 /** Attribute a type argument list, returning a list of types. 753 * Caller is responsible for calling checkRefTypes. 754 */ 755 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 756 ListBuffer<Type> argtypes = new ListBuffer<>(); 757 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 758 argtypes.append(attribType(l.head, env)); 759 return argtypes.toList(); 760 } 761 762 /** Attribute a type argument list, returning a list of types. 763 * Check that all the types are references. 764 */ 765 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 766 List<Type> types = attribAnyTypes(trees, env); 767 return chk.checkRefTypes(trees, types); 768 } 769 770 /** 771 * Attribute type variables (of generic classes or methods). 772 * Compound types are attributed later in attribBounds. 773 * @param typarams the type variables to enter 774 * @param env the current environment 775 */ 776 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 777 for (JCTypeParameter tvar : typarams) { 778 TypeVar a = (TypeVar)tvar.type; 779 a.tsym.flags_field |= UNATTRIBUTED; 780 a.bound = Type.noType; 781 if (!tvar.bounds.isEmpty()) { 782 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 783 for (JCExpression bound : tvar.bounds.tail) 784 bounds = bounds.prepend(attribType(bound, env)); 785 types.setBounds(a, bounds.reverse()); 786 } else { 787 // if no bounds are given, assume a single bound of 788 // java.lang.Object. 789 types.setBounds(a, List.of(syms.objectType)); 790 } 791 a.tsym.flags_field &= ~UNATTRIBUTED; 792 } 793 for (JCTypeParameter tvar : typarams) { 794 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 795 } 796 } 797 798 /** 799 * Attribute the type references in a list of annotations. 800 */ 801 void attribAnnotationTypes(List<JCAnnotation> annotations, 802 Env<AttrContext> env) { 803 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 804 JCAnnotation a = al.head; 805 attribType(a.annotationType, env); 806 } 807 } 808 809 /** 810 * Attribute a "lazy constant value". 811 * @param env The env for the const value 812 * @param variable The initializer for the const value 813 * @param type The expected type, or null 814 * @see VarSymbol#setLazyConstValue 815 */ 816 public Object attribLazyConstantValue(Env<AttrContext> env, 817 JCVariableDecl variable, 818 Type type) { 819 820 DiagnosticPosition prevLintPos 821 = deferredLintHandler.setPos(variable.pos()); 822 823 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 824 try { 825 Type itype = attribExpr(variable.init, env, type); 826 if (itype.constValue() != null) { 827 return coerce(itype, type).constValue(); 828 } else { 829 return null; 830 } 831 } finally { 832 log.useSource(prevSource); 833 deferredLintHandler.setPos(prevLintPos); 834 } 835 } 836 837 /** Attribute type reference in an `extends' or `implements' clause. 838 * Supertypes of anonymous inner classes are usually already attributed. 839 * 840 * @param tree The tree making up the type reference. 841 * @param env The environment current at the reference. 842 * @param classExpected true if only a class is expected here. 843 * @param interfaceExpected true if only an interface is expected here. 844 */ 845 Type attribBase(JCTree tree, 846 Env<AttrContext> env, 847 boolean classExpected, 848 boolean interfaceExpected, 849 boolean checkExtensible) { 850 Type t = tree.type != null ? 851 tree.type : 852 attribType(tree, env); 853 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 854 } 855 Type checkBase(Type t, 856 JCTree tree, 857 Env<AttrContext> env, 858 boolean classExpected, 859 boolean interfaceExpected, 860 boolean checkExtensible) { 861 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 862 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 863 if (t.tsym.isAnonymous()) { 864 log.error(pos, "cant.inherit.from.anon"); 865 return types.createErrorType(t); 866 } 867 if (t.isErroneous()) 868 return t; 869 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 870 // check that type variable is already visible 871 if (t.getUpperBound() == null) { 872 log.error(pos, "illegal.forward.ref"); 873 return types.createErrorType(t); 874 } 875 } else { 876 t = chk.checkClassType(pos, t, checkExtensible); 877 } 878 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 879 log.error(pos, "intf.expected.here"); 880 // return errType is necessary since otherwise there might 881 // be undetected cycles which cause attribution to loop 882 return types.createErrorType(t); 883 } else if (checkExtensible && 884 classExpected && 885 (t.tsym.flags() & INTERFACE) != 0) { 886 log.error(pos, "no.intf.expected.here"); 887 return types.createErrorType(t); 888 } 889 if (checkExtensible && 890 ((t.tsym.flags() & FINAL) != 0)) { 891 log.error(pos, 892 "cant.inherit.from.final", t.tsym); 893 } 894 chk.checkNonCyclic(pos, t); 895 return t; 896 } 897 898 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 899 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 900 id.type = env.info.scope.owner.enclClass().type; 901 id.sym = env.info.scope.owner.enclClass(); 902 return id.type; 903 } 904 905 public void visitClassDef(JCClassDecl tree) { 906 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 907 Optional.ofNullable(env.info.isSpeculative ? 908 argumentAttr.withLocalCacheContext() : null); 909 try { 910 // Local and anonymous classes have not been entered yet, so we need to 911 // do it now. 912 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 913 enter.classEnter(tree, env); 914 } else { 915 // If this class declaration is part of a class level annotation, 916 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 917 // order to simplify later steps and allow for sensible error 918 // messages. 919 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 920 enter.classEnter(tree, env); 921 } 922 923 ClassSymbol c = tree.sym; 924 if (c == null) { 925 // exit in case something drastic went wrong during enter. 926 result = null; 927 } else { 928 // make sure class has been completed: 929 c.complete(); 930 931 // If this class appears as an anonymous class 932 // in a superclass constructor call 933 // disable implicit outer instance from being passed. 934 // (This would be an illegal access to "this before super"). 935 if (env.info.isSelfCall && 936 env.tree.hasTag(NEWCLASS)) { 937 c.flags_field |= NOOUTERTHIS; 938 } 939 attribClass(tree.pos(), c); 940 result = tree.type = c.type; 941 } 942 } finally { 943 localCacheContext.ifPresent(LocalCacheContext::leave); 944 } 945 } 946 947 public void visitMethodDef(JCMethodDecl tree) { 948 MethodSymbol m = tree.sym; 949 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 950 951 Lint lint = env.info.lint.augment(m); 952 Lint prevLint = chk.setLint(lint); 953 MethodSymbol prevMethod = chk.setMethod(m); 954 try { 955 deferredLintHandler.flush(tree.pos()); 956 chk.checkDeprecatedAnnotation(tree.pos(), m); 957 958 959 // Create a new environment with local scope 960 // for attributing the method. 961 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 962 localEnv.info.lint = lint; 963 964 attribStats(tree.typarams, localEnv); 965 966 // If we override any other methods, check that we do so properly. 967 // JLS ??? 968 if (m.isStatic()) { 969 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 970 } else { 971 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 972 } 973 chk.checkOverride(env, tree, m); 974 975 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 976 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 977 } 978 979 // Enter all type parameters into the local method scope. 980 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 981 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 982 983 ClassSymbol owner = env.enclClass.sym; 984 if ((owner.flags() & ANNOTATION) != 0 && 985 (tree.params.nonEmpty() || 986 tree.recvparam != null)) 987 log.error(tree.params.nonEmpty() ? 988 tree.params.head.pos() : 989 tree.recvparam.pos(), 990 "intf.annotation.members.cant.have.params"); 991 992 // Attribute all value parameters. 993 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 994 attribStat(l.head, localEnv); 995 } 996 997 chk.checkVarargsMethodDecl(localEnv, tree); 998 999 // Check that type parameters are well-formed. 1000 chk.validate(tree.typarams, localEnv); 1001 1002 // Check that result type is well-formed. 1003 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 1004 chk.validate(tree.restype, localEnv); 1005 1006 // Check that receiver type is well-formed. 1007 if (tree.recvparam != null) { 1008 // Use a new environment to check the receiver parameter. 1009 // Otherwise I get "might not have been initialized" errors. 1010 // Is there a better way? 1011 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1012 attribType(tree.recvparam, newEnv); 1013 chk.validate(tree.recvparam, newEnv); 1014 } 1015 1016 // annotation method checks 1017 if ((owner.flags() & ANNOTATION) != 0) { 1018 // annotation method cannot have throws clause 1019 if (tree.thrown.nonEmpty()) { 1020 log.error(tree.thrown.head.pos(), 1021 "throws.not.allowed.in.intf.annotation"); 1022 } 1023 // annotation method cannot declare type-parameters 1024 if (tree.typarams.nonEmpty()) { 1025 log.error(tree.typarams.head.pos(), 1026 "intf.annotation.members.cant.have.type.params"); 1027 } 1028 // validate annotation method's return type (could be an annotation type) 1029 chk.validateAnnotationType(tree.restype); 1030 // ensure that annotation method does not clash with members of Object/Annotation 1031 chk.validateAnnotationMethod(tree.pos(), m); 1032 } 1033 1034 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1035 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1036 1037 if (tree.body == null) { 1038 // Empty bodies are only allowed for 1039 // abstract, native, or interface methods, or for methods 1040 // in a retrofit signature class. 1041 if (tree.defaultValue != null) { 1042 if ((owner.flags() & ANNOTATION) == 0) 1043 log.error(tree.pos(), 1044 "default.allowed.in.intf.annotation.member"); 1045 } 1046 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1047 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1048 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1049 if ((owner.flags() & INTERFACE) != 0) { 1050 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1051 } else { 1052 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1053 } 1054 } else if ((tree.mods.flags & NATIVE) != 0) { 1055 log.error(tree.pos(), "native.meth.cant.have.body"); 1056 } else { 1057 // Add an implicit super() call unless an explicit call to 1058 // super(...) or this(...) is given 1059 // or we are compiling class java.lang.Object. 1060 if (tree.name == names.init && owner.type != syms.objectType) { 1061 JCBlock body = tree.body; 1062 if (body.stats.isEmpty() || 1063 !TreeInfo.isSelfCall(body.stats.head)) { 1064 body.stats = body.stats. 1065 prepend(typeEnter.SuperCall(make.at(body.pos), 1066 List.nil(), 1067 List.nil(), 1068 false)); 1069 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1070 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1071 TreeInfo.isSuperCall(body.stats.head)) { 1072 // enum constructors are not allowed to call super 1073 // directly, so make sure there aren't any super calls 1074 // in enum constructors, except in the compiler 1075 // generated one. 1076 log.error(tree.body.stats.head.pos(), 1077 "call.to.super.not.allowed.in.enum.ctor", 1078 env.enclClass.sym); 1079 } 1080 } 1081 1082 // Attribute all type annotations in the body 1083 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1084 annotate.flush(); 1085 1086 // Attribute method body. 1087 attribStat(tree.body, localEnv); 1088 } 1089 1090 localEnv.info.scope.leave(); 1091 result = tree.type = m.type; 1092 } finally { 1093 chk.setLint(prevLint); 1094 chk.setMethod(prevMethod); 1095 } 1096 } 1097 1098 public void visitVarDef(JCVariableDecl tree) { 1099 // Local variables have not been entered yet, so we need to do it now: 1100 if (env.info.scope.owner.kind == MTH) { 1101 if (tree.sym != null) { 1102 // parameters have already been entered 1103 env.info.scope.enter(tree.sym); 1104 } else { 1105 try { 1106 annotate.blockAnnotations(); 1107 memberEnter.memberEnter(tree, env); 1108 } finally { 1109 annotate.unblockAnnotations(); 1110 } 1111 } 1112 } else { 1113 if (tree.init != null) { 1114 // Field initializer expression need to be entered. 1115 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1116 annotate.flush(); 1117 } 1118 } 1119 1120 VarSymbol v = tree.sym; 1121 Lint lint = env.info.lint.augment(v); 1122 Lint prevLint = chk.setLint(lint); 1123 1124 // Check that the variable's declared type is well-formed. 1125 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1126 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1127 (tree.sym.flags() & PARAMETER) != 0; 1128 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1129 1130 try { 1131 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1132 deferredLintHandler.flush(tree.pos()); 1133 chk.checkDeprecatedAnnotation(tree.pos(), v); 1134 1135 if (tree.init != null) { 1136 if ((v.flags_field & FINAL) == 0 || 1137 !memberEnter.needsLazyConstValue(tree.init)) { 1138 // Not a compile-time constant 1139 // Attribute initializer in a new environment 1140 // with the declared variable as owner. 1141 // Check that initializer conforms to variable's declared type. 1142 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1143 initEnv.info.lint = lint; 1144 // In order to catch self-references, we set the variable's 1145 // declaration position to maximal possible value, effectively 1146 // marking the variable as undefined. 1147 initEnv.info.enclVar = v; 1148 attribExpr(tree.init, initEnv, v.type); 1149 } 1150 } 1151 result = tree.type = v.type; 1152 } 1153 finally { 1154 chk.setLint(prevLint); 1155 } 1156 } 1157 1158 public void visitSkip(JCSkip tree) { 1159 result = null; 1160 } 1161 1162 public void visitBlock(JCBlock tree) { 1163 if (env.info.scope.owner.kind == TYP) { 1164 // Block is a static or instance initializer; 1165 // let the owner of the environment be a freshly 1166 // created BLOCK-method. 1167 Symbol fakeOwner = 1168 new MethodSymbol(tree.flags | BLOCK | 1169 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1170 env.info.scope.owner); 1171 final Env<AttrContext> localEnv = 1172 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1173 1174 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1175 // Attribute all type annotations in the block 1176 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1177 annotate.flush(); 1178 attribStats(tree.stats, localEnv); 1179 1180 { 1181 // Store init and clinit type annotations with the ClassSymbol 1182 // to allow output in Gen.normalizeDefs. 1183 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1184 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1185 if ((tree.flags & STATIC) != 0) { 1186 cs.appendClassInitTypeAttributes(tas); 1187 } else { 1188 cs.appendInitTypeAttributes(tas); 1189 } 1190 } 1191 } else { 1192 // Create a new local environment with a local scope. 1193 Env<AttrContext> localEnv = 1194 env.dup(tree, env.info.dup(env.info.scope.dup())); 1195 try { 1196 attribStats(tree.stats, localEnv); 1197 } finally { 1198 localEnv.info.scope.leave(); 1199 } 1200 } 1201 result = null; 1202 } 1203 1204 public void visitDoLoop(JCDoWhileLoop tree) { 1205 attribStat(tree.body, env.dup(tree)); 1206 attribExpr(tree.cond, env, syms.booleanType); 1207 result = null; 1208 } 1209 1210 public void visitWhileLoop(JCWhileLoop tree) { 1211 attribExpr(tree.cond, env, syms.booleanType); 1212 attribStat(tree.body, env.dup(tree)); 1213 result = null; 1214 } 1215 1216 public void visitForLoop(JCForLoop tree) { 1217 Env<AttrContext> loopEnv = 1218 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1219 try { 1220 attribStats(tree.init, loopEnv); 1221 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1222 loopEnv.tree = tree; // before, we were not in loop! 1223 attribStats(tree.step, loopEnv); 1224 attribStat(tree.body, loopEnv); 1225 result = null; 1226 } 1227 finally { 1228 loopEnv.info.scope.leave(); 1229 } 1230 } 1231 1232 public void visitForeachLoop(JCEnhancedForLoop tree) { 1233 Env<AttrContext> loopEnv = 1234 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1235 try { 1236 //the Formal Parameter of a for-each loop is not in the scope when 1237 //attributing the for-each expression; we mimick this by attributing 1238 //the for-each expression first (against original scope). 1239 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1240 attribStat(tree.var, loopEnv); 1241 chk.checkNonVoid(tree.pos(), exprType); 1242 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1243 if (elemtype == null) { 1244 // or perhaps expr implements Iterable<T>? 1245 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1246 if (base == null) { 1247 log.error(tree.expr.pos(), 1248 "foreach.not.applicable.to.type", 1249 exprType, 1250 diags.fragment("type.req.array.or.iterable")); 1251 elemtype = types.createErrorType(exprType); 1252 } else { 1253 List<Type> iterableParams = base.allparams(); 1254 elemtype = iterableParams.isEmpty() 1255 ? syms.objectType 1256 : types.wildUpperBound(iterableParams.head); 1257 } 1258 } 1259 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1260 loopEnv.tree = tree; // before, we were not in loop! 1261 attribStat(tree.body, loopEnv); 1262 result = null; 1263 } 1264 finally { 1265 loopEnv.info.scope.leave(); 1266 } 1267 } 1268 1269 public void visitLabelled(JCLabeledStatement tree) { 1270 // Check that label is not used in an enclosing statement 1271 Env<AttrContext> env1 = env; 1272 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1273 if (env1.tree.hasTag(LABELLED) && 1274 ((JCLabeledStatement) env1.tree).label == tree.label) { 1275 log.error(tree.pos(), "label.already.in.use", 1276 tree.label); 1277 break; 1278 } 1279 env1 = env1.next; 1280 } 1281 1282 attribStat(tree.body, env.dup(tree)); 1283 result = null; 1284 } 1285 1286 public void visitSwitch(JCSwitch tree) { 1287 Type seltype = attribExpr(tree.selector, env); 1288 1289 Env<AttrContext> switchEnv = 1290 env.dup(tree, env.info.dup(env.info.scope.dup())); 1291 1292 try { 1293 1294 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1295 boolean stringSwitch = types.isSameType(seltype, syms.stringType); 1296 if (stringSwitch && !allowStringsInSwitch) { 1297 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1298 } 1299 if (!enumSwitch && !stringSwitch) 1300 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1301 1302 // Attribute all cases and 1303 // check that there are no duplicate case labels or default clauses. 1304 Set<Object> labels = new HashSet<>(); // The set of case labels. 1305 boolean hasDefault = false; // Is there a default label? 1306 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1307 JCCase c = l.head; 1308 if (c.pat != null) { 1309 if (enumSwitch) { 1310 Symbol sym = enumConstant(c.pat, seltype); 1311 if (sym == null) { 1312 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1313 } else if (!labels.add(sym)) { 1314 log.error(c.pos(), "duplicate.case.label"); 1315 } 1316 } else { 1317 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1318 if (!pattype.hasTag(ERROR)) { 1319 if (pattype.constValue() == null) { 1320 log.error(c.pat.pos(), 1321 (stringSwitch ? "string.const.req" : "const.expr.req")); 1322 } else if (!labels.add(pattype.constValue())) { 1323 log.error(c.pos(), "duplicate.case.label"); 1324 } 1325 } 1326 } 1327 } else if (hasDefault) { 1328 log.error(c.pos(), "duplicate.default.label"); 1329 } else { 1330 hasDefault = true; 1331 } 1332 Env<AttrContext> caseEnv = 1333 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1334 try { 1335 attribStats(c.stats, caseEnv); 1336 } finally { 1337 caseEnv.info.scope.leave(); 1338 addVars(c.stats, switchEnv.info.scope); 1339 } 1340 } 1341 1342 result = null; 1343 } 1344 finally { 1345 switchEnv.info.scope.leave(); 1346 } 1347 } 1348 // where 1349 /** Add any variables defined in stats to the switch scope. */ 1350 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1351 for (;stats.nonEmpty(); stats = stats.tail) { 1352 JCTree stat = stats.head; 1353 if (stat.hasTag(VARDEF)) 1354 switchScope.enter(((JCVariableDecl) stat).sym); 1355 } 1356 } 1357 // where 1358 /** Return the selected enumeration constant symbol, or null. */ 1359 private Symbol enumConstant(JCTree tree, Type enumType) { 1360 if (tree.hasTag(IDENT)) { 1361 JCIdent ident = (JCIdent)tree; 1362 Name name = ident.name; 1363 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1364 if (sym.kind == VAR) { 1365 Symbol s = ident.sym = sym; 1366 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1367 ident.type = s.type; 1368 return ((s.flags_field & Flags.ENUM) == 0) 1369 ? null : s; 1370 } 1371 } 1372 } 1373 return null; 1374 } 1375 1376 public void visitSynchronized(JCSynchronized tree) { 1377 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1378 attribStat(tree.body, env); 1379 result = null; 1380 } 1381 1382 public void visitTry(JCTry tree) { 1383 // Create a new local environment with a local 1384 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1385 try { 1386 boolean isTryWithResource = tree.resources.nonEmpty(); 1387 // Create a nested environment for attributing the try block if needed 1388 Env<AttrContext> tryEnv = isTryWithResource ? 1389 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1390 localEnv; 1391 try { 1392 // Attribute resource declarations 1393 for (JCTree resource : tree.resources) { 1394 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1395 @Override 1396 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1397 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1398 } 1399 }; 1400 ResultInfo twrResult = 1401 new ResultInfo(KindSelector.VAR, 1402 syms.autoCloseableType, 1403 twrContext); 1404 if (resource.hasTag(VARDEF)) { 1405 attribStat(resource, tryEnv); 1406 twrResult.check(resource, resource.type); 1407 1408 //check that resource type cannot throw InterruptedException 1409 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1410 1411 VarSymbol var = ((JCVariableDecl) resource).sym; 1412 var.setData(ElementKind.RESOURCE_VARIABLE); 1413 } else { 1414 attribTree(resource, tryEnv, twrResult); 1415 } 1416 } 1417 // Attribute body 1418 attribStat(tree.body, tryEnv); 1419 } finally { 1420 if (isTryWithResource) 1421 tryEnv.info.scope.leave(); 1422 } 1423 1424 // Attribute catch clauses 1425 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1426 JCCatch c = l.head; 1427 Env<AttrContext> catchEnv = 1428 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1429 try { 1430 Type ctype = attribStat(c.param, catchEnv); 1431 if (TreeInfo.isMultiCatch(c)) { 1432 //multi-catch parameter is implicitly marked as final 1433 c.param.sym.flags_field |= FINAL | UNION; 1434 } 1435 if (c.param.sym.kind == VAR) { 1436 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1437 } 1438 chk.checkType(c.param.vartype.pos(), 1439 chk.checkClassType(c.param.vartype.pos(), ctype), 1440 syms.throwableType); 1441 attribStat(c.body, catchEnv); 1442 } finally { 1443 catchEnv.info.scope.leave(); 1444 } 1445 } 1446 1447 // Attribute finalizer 1448 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1449 result = null; 1450 } 1451 finally { 1452 localEnv.info.scope.leave(); 1453 } 1454 } 1455 1456 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1457 if (!resource.isErroneous() && 1458 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1459 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1460 Symbol close = syms.noSymbol; 1461 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1462 try { 1463 close = rs.resolveQualifiedMethod(pos, 1464 env, 1465 types.skipTypeVars(resource, false), 1466 names.close, 1467 List.nil(), 1468 List.nil()); 1469 } 1470 finally { 1471 log.popDiagnosticHandler(discardHandler); 1472 } 1473 if (close.kind == MTH && 1474 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1475 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1476 env.info.lint.isEnabled(LintCategory.TRY)) { 1477 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1478 } 1479 } 1480 } 1481 1482 public void visitConditional(JCConditional tree) { 1483 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1484 1485 tree.polyKind = (!allowPoly || 1486 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1487 isBooleanOrNumeric(env, tree)) ? 1488 PolyKind.STANDALONE : PolyKind.POLY; 1489 1490 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1491 //this means we are returning a poly conditional from void-compatible lambda expression 1492 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1493 result = tree.type = types.createErrorType(resultInfo.pt); 1494 return; 1495 } 1496 1497 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1498 unknownExprInfo : 1499 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1500 1501 Type truetype = attribTree(tree.truepart, env, condInfo); 1502 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1503 1504 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1505 if (condtype.constValue() != null && 1506 truetype.constValue() != null && 1507 falsetype.constValue() != null && 1508 !owntype.hasTag(NONE)) { 1509 //constant folding 1510 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1511 } 1512 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1513 } 1514 //where 1515 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1516 switch (tree.getTag()) { 1517 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1518 ((JCLiteral)tree).typetag == BOOLEAN || 1519 ((JCLiteral)tree).typetag == BOT; 1520 case LAMBDA: case REFERENCE: return false; 1521 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1522 case CONDEXPR: 1523 JCConditional condTree = (JCConditional)tree; 1524 return isBooleanOrNumeric(env, condTree.truepart) && 1525 isBooleanOrNumeric(env, condTree.falsepart); 1526 case APPLY: 1527 JCMethodInvocation speculativeMethodTree = 1528 (JCMethodInvocation)deferredAttr.attribSpeculative( 1529 tree, env, unknownExprInfo, 1530 argumentAttr.withLocalCacheContext()); 1531 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1532 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1533 env.enclClass.type : 1534 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1535 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1536 return primitiveOrBoxed(owntype); 1537 case NEWCLASS: 1538 JCExpression className = 1539 removeClassParams.translate(((JCNewClass)tree).clazz); 1540 JCExpression speculativeNewClassTree = 1541 (JCExpression)deferredAttr.attribSpeculative( 1542 className, env, unknownTypeInfo, 1543 argumentAttr.withLocalCacheContext()); 1544 return primitiveOrBoxed(speculativeNewClassTree.type); 1545 default: 1546 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo, 1547 argumentAttr.withLocalCacheContext()).type; 1548 return primitiveOrBoxed(speculativeType); 1549 } 1550 } 1551 //where 1552 boolean primitiveOrBoxed(Type t) { 1553 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1554 } 1555 1556 TreeTranslator removeClassParams = new TreeTranslator() { 1557 @Override 1558 public void visitTypeApply(JCTypeApply tree) { 1559 result = translate(tree.clazz); 1560 } 1561 }; 1562 1563 CheckContext conditionalContext(CheckContext checkContext) { 1564 return new Check.NestedCheckContext(checkContext) { 1565 //this will use enclosing check context to check compatibility of 1566 //subexpression against target type; if we are in a method check context, 1567 //depending on whether boxing is allowed, we could have incompatibilities 1568 @Override 1569 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1570 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1571 } 1572 }; 1573 } 1574 1575 /** Compute the type of a conditional expression, after 1576 * checking that it exists. See JLS 15.25. Does not take into 1577 * account the special case where condition and both arms 1578 * are constants. 1579 * 1580 * @param pos The source position to be used for error 1581 * diagnostics. 1582 * @param thentype The type of the expression's then-part. 1583 * @param elsetype The type of the expression's else-part. 1584 */ 1585 Type condType(DiagnosticPosition pos, 1586 Type thentype, Type elsetype) { 1587 // If same type, that is the result 1588 if (types.isSameType(thentype, elsetype)) 1589 return thentype.baseType(); 1590 1591 Type thenUnboxed = (thentype.isPrimitive()) 1592 ? thentype : types.unboxedType(thentype); 1593 Type elseUnboxed = (elsetype.isPrimitive()) 1594 ? elsetype : types.unboxedType(elsetype); 1595 1596 // Otherwise, if both arms can be converted to a numeric 1597 // type, return the least numeric type that fits both arms 1598 // (i.e. return larger of the two, or return int if one 1599 // arm is short, the other is char). 1600 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1601 // If one arm has an integer subrange type (i.e., byte, 1602 // short, or char), and the other is an integer constant 1603 // that fits into the subrange, return the subrange type. 1604 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1605 elseUnboxed.hasTag(INT) && 1606 types.isAssignable(elseUnboxed, thenUnboxed)) { 1607 return thenUnboxed.baseType(); 1608 } 1609 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1610 thenUnboxed.hasTag(INT) && 1611 types.isAssignable(thenUnboxed, elseUnboxed)) { 1612 return elseUnboxed.baseType(); 1613 } 1614 1615 for (TypeTag tag : primitiveTags) { 1616 Type candidate = syms.typeOfTag[tag.ordinal()]; 1617 if (types.isSubtype(thenUnboxed, candidate) && 1618 types.isSubtype(elseUnboxed, candidate)) { 1619 return candidate; 1620 } 1621 } 1622 } 1623 1624 // Those were all the cases that could result in a primitive 1625 if (thentype.isPrimitive()) 1626 thentype = types.boxedClass(thentype).type; 1627 if (elsetype.isPrimitive()) 1628 elsetype = types.boxedClass(elsetype).type; 1629 1630 if (types.isSubtype(thentype, elsetype)) 1631 return elsetype.baseType(); 1632 if (types.isSubtype(elsetype, thentype)) 1633 return thentype.baseType(); 1634 1635 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1636 log.error(pos, "neither.conditional.subtype", 1637 thentype, elsetype); 1638 return thentype.baseType(); 1639 } 1640 1641 // both are known to be reference types. The result is 1642 // lub(thentype,elsetype). This cannot fail, as it will 1643 // always be possible to infer "Object" if nothing better. 1644 return types.lub(thentype.baseType(), elsetype.baseType()); 1645 } 1646 1647 final static TypeTag[] primitiveTags = new TypeTag[]{ 1648 BYTE, 1649 CHAR, 1650 SHORT, 1651 INT, 1652 LONG, 1653 FLOAT, 1654 DOUBLE, 1655 BOOLEAN, 1656 }; 1657 1658 public void visitIf(JCIf tree) { 1659 attribExpr(tree.cond, env, syms.booleanType); 1660 attribStat(tree.thenpart, env); 1661 if (tree.elsepart != null) 1662 attribStat(tree.elsepart, env); 1663 chk.checkEmptyIf(tree); 1664 result = null; 1665 } 1666 1667 public void visitExec(JCExpressionStatement tree) { 1668 //a fresh environment is required for 292 inference to work properly --- 1669 //see Infer.instantiatePolymorphicSignatureInstance() 1670 Env<AttrContext> localEnv = env.dup(tree); 1671 attribExpr(tree.expr, localEnv); 1672 result = null; 1673 } 1674 1675 public void visitBreak(JCBreak tree) { 1676 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1677 result = null; 1678 } 1679 1680 public void visitContinue(JCContinue tree) { 1681 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1682 result = null; 1683 } 1684 //where 1685 /** Return the target of a break or continue statement, if it exists, 1686 * report an error if not. 1687 * Note: The target of a labelled break or continue is the 1688 * (non-labelled) statement tree referred to by the label, 1689 * not the tree representing the labelled statement itself. 1690 * 1691 * @param pos The position to be used for error diagnostics 1692 * @param tag The tag of the jump statement. This is either 1693 * Tree.BREAK or Tree.CONTINUE. 1694 * @param label The label of the jump statement, or null if no 1695 * label is given. 1696 * @param env The environment current at the jump statement. 1697 */ 1698 private JCTree findJumpTarget(DiagnosticPosition pos, 1699 JCTree.Tag tag, 1700 Name label, 1701 Env<AttrContext> env) { 1702 // Search environments outwards from the point of jump. 1703 Env<AttrContext> env1 = env; 1704 LOOP: 1705 while (env1 != null) { 1706 switch (env1.tree.getTag()) { 1707 case LABELLED: 1708 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1709 if (label == labelled.label) { 1710 // If jump is a continue, check that target is a loop. 1711 if (tag == CONTINUE) { 1712 if (!labelled.body.hasTag(DOLOOP) && 1713 !labelled.body.hasTag(WHILELOOP) && 1714 !labelled.body.hasTag(FORLOOP) && 1715 !labelled.body.hasTag(FOREACHLOOP)) 1716 log.error(pos, "not.loop.label", label); 1717 // Found labelled statement target, now go inwards 1718 // to next non-labelled tree. 1719 return TreeInfo.referencedStatement(labelled); 1720 } else { 1721 return labelled; 1722 } 1723 } 1724 break; 1725 case DOLOOP: 1726 case WHILELOOP: 1727 case FORLOOP: 1728 case FOREACHLOOP: 1729 if (label == null) return env1.tree; 1730 break; 1731 case SWITCH: 1732 if (label == null && tag == BREAK) return env1.tree; 1733 break; 1734 case LAMBDA: 1735 case METHODDEF: 1736 case CLASSDEF: 1737 break LOOP; 1738 default: 1739 } 1740 env1 = env1.next; 1741 } 1742 if (label != null) 1743 log.error(pos, "undef.label", label); 1744 else if (tag == CONTINUE) 1745 log.error(pos, "cont.outside.loop"); 1746 else 1747 log.error(pos, "break.outside.switch.loop"); 1748 return null; 1749 } 1750 1751 public void visitReturn(JCReturn tree) { 1752 // Check that there is an enclosing method which is 1753 // nested within than the enclosing class. 1754 if (env.info.returnResult == null) { 1755 log.error(tree.pos(), "ret.outside.meth"); 1756 } else { 1757 // Attribute return expression, if it exists, and check that 1758 // it conforms to result type of enclosing method. 1759 if (tree.expr != null) { 1760 if (env.info.returnResult.pt.hasTag(VOID)) { 1761 env.info.returnResult.checkContext.report(tree.expr.pos(), 1762 diags.fragment("unexpected.ret.val")); 1763 } 1764 attribTree(tree.expr, env, env.info.returnResult); 1765 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1766 !env.info.returnResult.pt.hasTag(NONE)) { 1767 env.info.returnResult.checkContext.report(tree.pos(), 1768 diags.fragment("missing.ret.val")); 1769 } 1770 } 1771 result = null; 1772 } 1773 1774 public void visitThrow(JCThrow tree) { 1775 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1776 if (allowPoly) { 1777 chk.checkType(tree, owntype, syms.throwableType); 1778 } 1779 result = null; 1780 } 1781 1782 public void visitAssert(JCAssert tree) { 1783 attribExpr(tree.cond, env, syms.booleanType); 1784 if (tree.detail != null) { 1785 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1786 } 1787 result = null; 1788 } 1789 1790 /** Visitor method for method invocations. 1791 * NOTE: The method part of an application will have in its type field 1792 * the return type of the method, not the method's type itself! 1793 */ 1794 public void visitApply(JCMethodInvocation tree) { 1795 // The local environment of a method application is 1796 // a new environment nested in the current one. 1797 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1798 1799 // The types of the actual method arguments. 1800 List<Type> argtypes; 1801 1802 // The types of the actual method type arguments. 1803 List<Type> typeargtypes = null; 1804 1805 Name methName = TreeInfo.name(tree.meth); 1806 1807 boolean isConstructorCall = 1808 methName == names._this || methName == names._super; 1809 1810 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1811 if (isConstructorCall) { 1812 // We are seeing a ...this(...) or ...super(...) call. 1813 // Check that this is the first statement in a constructor. 1814 if (checkFirstConstructorStat(tree, env)) { 1815 1816 // Record the fact 1817 // that this is a constructor call (using isSelfCall). 1818 localEnv.info.isSelfCall = true; 1819 1820 // Attribute arguments, yielding list of argument types. 1821 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 1822 argtypes = argtypesBuf.toList(); 1823 typeargtypes = attribTypes(tree.typeargs, localEnv); 1824 1825 // Variable `site' points to the class in which the called 1826 // constructor is defined. 1827 Type site = env.enclClass.sym.type; 1828 if (methName == names._super) { 1829 if (site == syms.objectType) { 1830 log.error(tree.meth.pos(), "no.superclass", site); 1831 site = types.createErrorType(syms.objectType); 1832 } else { 1833 site = types.supertype(site); 1834 } 1835 } 1836 1837 if (site.hasTag(CLASS)) { 1838 Type encl = site.getEnclosingType(); 1839 while (encl != null && encl.hasTag(TYPEVAR)) 1840 encl = encl.getUpperBound(); 1841 if (encl.hasTag(CLASS)) { 1842 // we are calling a nested class 1843 1844 if (tree.meth.hasTag(SELECT)) { 1845 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1846 1847 // We are seeing a prefixed call, of the form 1848 // <expr>.super(...). 1849 // Check that the prefix expression conforms 1850 // to the outer instance type of the class. 1851 chk.checkRefType(qualifier.pos(), 1852 attribExpr(qualifier, localEnv, 1853 encl)); 1854 } else if (methName == names._super) { 1855 // qualifier omitted; check for existence 1856 // of an appropriate implicit qualifier. 1857 rs.resolveImplicitThis(tree.meth.pos(), 1858 localEnv, site, true); 1859 } 1860 } else if (tree.meth.hasTag(SELECT)) { 1861 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1862 site.tsym); 1863 } 1864 1865 // if we're calling a java.lang.Enum constructor, 1866 // prefix the implicit String and int parameters 1867 if (site.tsym == syms.enumSym) 1868 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1869 1870 // Resolve the called constructor under the assumption 1871 // that we are referring to a superclass instance of the 1872 // current instance (JLS ???). 1873 boolean selectSuperPrev = localEnv.info.selectSuper; 1874 localEnv.info.selectSuper = true; 1875 localEnv.info.pendingResolutionPhase = null; 1876 Symbol sym = rs.resolveConstructor( 1877 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1878 localEnv.info.selectSuper = selectSuperPrev; 1879 1880 // Set method symbol to resolved constructor... 1881 TreeInfo.setSymbol(tree.meth, sym); 1882 1883 // ...and check that it is legal in the current context. 1884 // (this will also set the tree's type) 1885 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1886 checkId(tree.meth, site, sym, localEnv, 1887 new ResultInfo(kind, mpt)); 1888 } 1889 // Otherwise, `site' is an error type and we do nothing 1890 } 1891 result = tree.type = syms.voidType; 1892 } else { 1893 // Otherwise, we are seeing a regular method call. 1894 // Attribute the arguments, yielding list of argument types, ... 1895 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1896 argtypes = argtypesBuf.toList(); 1897 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1898 1899 // ... and attribute the method using as a prototype a methodtype 1900 // whose formal argument types is exactly the list of actual 1901 // arguments (this will also set the method symbol). 1902 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1903 localEnv.info.pendingResolutionPhase = null; 1904 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1905 1906 // Compute the result type. 1907 Type restype = mtype.getReturnType(); 1908 if (restype.hasTag(WILDCARD)) 1909 throw new AssertionError(mtype); 1910 1911 Type qualifier = (tree.meth.hasTag(SELECT)) 1912 ? ((JCFieldAccess) tree.meth).selected.type 1913 : env.enclClass.sym.type; 1914 Symbol msym = TreeInfo.symbol(tree.meth); 1915 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 1916 1917 chk.checkRefTypes(tree.typeargs, typeargtypes); 1918 1919 // Check that value of resulting type is admissible in the 1920 // current context. Also, capture the return type 1921 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 1922 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 1923 } 1924 chk.validate(tree.typeargs, localEnv); 1925 } 1926 //where 1927 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1928 if (msym != null && 1929 msym.owner == syms.objectType.tsym && 1930 methodName == names.getClass && 1931 argtypes.isEmpty()) { 1932 // as a special case, x.getClass() has type Class<? extends |X|> 1933 return new ClassType(restype.getEnclosingType(), 1934 List.of(new WildcardType(types.erasure(qualifierType), 1935 BoundKind.EXTENDS, 1936 syms.boundClass)), 1937 restype.tsym, 1938 restype.getMetadata()); 1939 } else if (msym != null && 1940 msym.owner == syms.arrayClass && 1941 methodName == names.clone && 1942 types.isArray(qualifierType)) { 1943 // as a special case, array.clone() has a result that is 1944 // the same as static type of the array being cloned 1945 return qualifierType; 1946 } else { 1947 return restype; 1948 } 1949 } 1950 1951 /** Check that given application node appears as first statement 1952 * in a constructor call. 1953 * @param tree The application node 1954 * @param env The environment current at the application. 1955 */ 1956 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1957 JCMethodDecl enclMethod = env.enclMethod; 1958 if (enclMethod != null && enclMethod.name == names.init) { 1959 JCBlock body = enclMethod.body; 1960 if (body.stats.head.hasTag(EXEC) && 1961 ((JCExpressionStatement) body.stats.head).expr == tree) 1962 return true; 1963 } 1964 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1965 TreeInfo.name(tree.meth)); 1966 return false; 1967 } 1968 1969 /** Obtain a method type with given argument types. 1970 */ 1971 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1972 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass); 1973 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1974 } 1975 1976 public void visitNewClass(final JCNewClass tree) { 1977 Type owntype = types.createErrorType(tree.type); 1978 1979 // The local environment of a class creation is 1980 // a new environment nested in the current one. 1981 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1982 1983 // The anonymous inner class definition of the new expression, 1984 // if one is defined by it. 1985 JCClassDecl cdef = tree.def; 1986 1987 // If enclosing class is given, attribute it, and 1988 // complete class name to be fully qualified 1989 JCExpression clazz = tree.clazz; // Class field following new 1990 JCExpression clazzid; // Identifier in class field 1991 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1992 annoclazzid = null; 1993 1994 if (clazz.hasTag(TYPEAPPLY)) { 1995 clazzid = ((JCTypeApply) clazz).clazz; 1996 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1997 annoclazzid = (JCAnnotatedType) clazzid; 1998 clazzid = annoclazzid.underlyingType; 1999 } 2000 } else { 2001 if (clazz.hasTag(ANNOTATED_TYPE)) { 2002 annoclazzid = (JCAnnotatedType) clazz; 2003 clazzid = annoclazzid.underlyingType; 2004 } else { 2005 clazzid = clazz; 2006 } 2007 } 2008 2009 JCExpression clazzid1 = clazzid; // The same in fully qualified form 2010 2011 if (tree.encl != null) { 2012 // We are seeing a qualified new, of the form 2013 // <expr>.new C <...> (...) ... 2014 // In this case, we let clazz stand for the name of the 2015 // allocated class C prefixed with the type of the qualifier 2016 // expression, so that we can 2017 // resolve it with standard techniques later. I.e., if 2018 // <expr> has type T, then <expr>.new C <...> (...) 2019 // yields a clazz T.C. 2020 Type encltype = chk.checkRefType(tree.encl.pos(), 2021 attribExpr(tree.encl, env)); 2022 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2023 // from expr to the combined type, or not? Yes, do this. 2024 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2025 ((JCIdent) clazzid).name); 2026 2027 EndPosTable endPosTable = this.env.toplevel.endPositions; 2028 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2029 if (clazz.hasTag(ANNOTATED_TYPE)) { 2030 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2031 List<JCAnnotation> annos = annoType.annotations; 2032 2033 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2034 clazzid1 = make.at(tree.pos). 2035 TypeApply(clazzid1, 2036 ((JCTypeApply) clazz).arguments); 2037 } 2038 2039 clazzid1 = make.at(tree.pos). 2040 AnnotatedType(annos, clazzid1); 2041 } else if (clazz.hasTag(TYPEAPPLY)) { 2042 clazzid1 = make.at(tree.pos). 2043 TypeApply(clazzid1, 2044 ((JCTypeApply) clazz).arguments); 2045 } 2046 2047 clazz = clazzid1; 2048 } 2049 2050 // Attribute clazz expression and store 2051 // symbol + type back into the attributed tree. 2052 Type clazztype; 2053 2054 try { 2055 env.info.isNewClass = true; 2056 clazztype = TreeInfo.isEnumInit(env.tree) ? 2057 attribIdentAsEnumType(env, (JCIdent)clazz) : 2058 attribType(clazz, env); 2059 } finally { 2060 env.info.isNewClass = false; 2061 } 2062 2063 clazztype = chk.checkDiamond(tree, clazztype); 2064 chk.validate(clazz, localEnv); 2065 if (tree.encl != null) { 2066 // We have to work in this case to store 2067 // symbol + type back into the attributed tree. 2068 tree.clazz.type = clazztype; 2069 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2070 clazzid.type = ((JCIdent) clazzid).sym.type; 2071 if (annoclazzid != null) { 2072 annoclazzid.type = clazzid.type; 2073 } 2074 if (!clazztype.isErroneous()) { 2075 if (cdef != null && clazztype.tsym.isInterface()) { 2076 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2077 } else if (clazztype.tsym.isStatic()) { 2078 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2079 } 2080 } 2081 } else if (!clazztype.tsym.isInterface() && 2082 clazztype.getEnclosingType().hasTag(CLASS)) { 2083 // Check for the existence of an apropos outer instance 2084 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2085 } 2086 2087 // Attribute constructor arguments. 2088 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2089 final KindSelector pkind = 2090 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2091 List<Type> argtypes = argtypesBuf.toList(); 2092 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2093 2094 // If we have made no mistakes in the class type... 2095 if (clazztype.hasTag(CLASS)) { 2096 // Enums may not be instantiated except implicitly 2097 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2098 (!env.tree.hasTag(VARDEF) || 2099 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2100 ((JCVariableDecl) env.tree).init != tree)) 2101 log.error(tree.pos(), "enum.cant.be.instantiated"); 2102 2103 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2104 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2105 boolean skipNonDiamondPath = false; 2106 // Check that class is not abstract 2107 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2108 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2109 log.error(tree.pos(), "abstract.cant.be.instantiated", 2110 clazztype.tsym); 2111 skipNonDiamondPath = true; 2112 } else if (cdef != null && clazztype.tsym.isInterface()) { 2113 // Check that no constructor arguments are given to 2114 // anonymous classes implementing an interface 2115 if (!argtypes.isEmpty()) 2116 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2117 2118 if (!typeargtypes.isEmpty()) 2119 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2120 2121 // Error recovery: pretend no arguments were supplied. 2122 argtypes = List.nil(); 2123 typeargtypes = List.nil(); 2124 skipNonDiamondPath = true; 2125 } 2126 if (TreeInfo.isDiamond(tree)) { 2127 ClassType site = new ClassType(clazztype.getEnclosingType(), 2128 clazztype.tsym.type.getTypeArguments(), 2129 clazztype.tsym, 2130 clazztype.getMetadata()); 2131 2132 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2133 diamondEnv.info.selectSuper = cdef != null; 2134 diamondEnv.info.pendingResolutionPhase = null; 2135 2136 //if the type of the instance creation expression is a class type 2137 //apply method resolution inference (JLS 15.12.2.7). The return type 2138 //of the resolved constructor will be a partially instantiated type 2139 Symbol constructor = rs.resolveDiamond(tree.pos(), 2140 diamondEnv, 2141 site, 2142 argtypes, 2143 typeargtypes); 2144 tree.constructor = constructor.baseSymbol(); 2145 2146 final TypeSymbol csym = clazztype.tsym; 2147 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2148 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2149 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2150 constructorType = checkId(tree, site, 2151 constructor, 2152 diamondEnv, 2153 diamondResult); 2154 2155 tree.clazz.type = types.createErrorType(clazztype); 2156 if (!constructorType.isErroneous()) { 2157 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2158 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2159 } 2160 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2161 } 2162 2163 // Resolve the called constructor under the assumption 2164 // that we are referring to a superclass instance of the 2165 // current instance (JLS ???). 2166 else if (!skipNonDiamondPath) { 2167 //the following code alters some of the fields in the current 2168 //AttrContext - hence, the current context must be dup'ed in 2169 //order to avoid downstream failures 2170 Env<AttrContext> rsEnv = localEnv.dup(tree); 2171 rsEnv.info.selectSuper = cdef != null; 2172 rsEnv.info.pendingResolutionPhase = null; 2173 tree.constructor = rs.resolveConstructor( 2174 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2175 if (cdef == null) { //do not check twice! 2176 tree.constructorType = checkId(tree, 2177 clazztype, 2178 tree.constructor, 2179 rsEnv, 2180 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2181 if (rsEnv.info.lastResolveVarargs()) 2182 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2183 } 2184 } 2185 2186 if (cdef != null) { 2187 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2188 return; 2189 } 2190 2191 if (tree.constructor != null && tree.constructor.kind == MTH) 2192 owntype = clazztype; 2193 } 2194 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2195 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2196 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2197 //we need to wait for inference to finish and then replace inference vars in the constructor type 2198 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2199 instantiatedContext -> { 2200 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2201 }); 2202 } 2203 chk.validate(tree.typeargs, localEnv); 2204 } 2205 2206 // where 2207 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2208 JCClassDecl cdef, Env<AttrContext> localEnv, 2209 List<Type> argtypes, List<Type> typeargtypes, 2210 KindSelector pkind) { 2211 // We are seeing an anonymous class instance creation. 2212 // In this case, the class instance creation 2213 // expression 2214 // 2215 // E.new <typeargs1>C<typargs2>(args) { ... } 2216 // 2217 // is represented internally as 2218 // 2219 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2220 // 2221 // This expression is then *transformed* as follows: 2222 // 2223 // (1) add an extends or implements clause 2224 // (2) add a constructor. 2225 // 2226 // For instance, if C is a class, and ET is the type of E, 2227 // the expression 2228 // 2229 // E.new <typeargs1>C<typargs2>(args) { ... } 2230 // 2231 // is translated to (where X is a fresh name and typarams is the 2232 // parameter list of the super constructor): 2233 // 2234 // new <typeargs1>X(<*nullchk*>E, args) where 2235 // X extends C<typargs2> { 2236 // <typarams> X(ET e, args) { 2237 // e.<typeargs1>super(args) 2238 // } 2239 // ... 2240 // } 2241 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2242 final boolean isDiamond = TreeInfo.isDiamond(tree); 2243 if (isDiamond 2244 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2245 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2246 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2247 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2248 instantiatedContext -> { 2249 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2250 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2251 ResultInfo prevResult = this.resultInfo; 2252 try { 2253 this.resultInfo = resultInfoForClassDefinition; 2254 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2255 localEnv, argtypes, typeargtypes, pkind); 2256 } finally { 2257 this.resultInfo = prevResult; 2258 } 2259 }); 2260 } else { 2261 if (isDiamond && clazztype.hasTag(CLASS)) { 2262 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2263 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2264 // One or more types inferred in the previous steps is non-denotable. 2265 Fragment fragment = Diamond(clazztype.tsym); 2266 log.error(tree.clazz.pos(), 2267 Errors.CantApplyDiamond1( 2268 fragment, 2269 invalidDiamondArgs.size() > 1 ? 2270 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2271 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2272 } 2273 // For <>(){}, inferred types must also be accessible. 2274 for (Type t : clazztype.getTypeArguments()) { 2275 rs.checkAccessibleType(env, t); 2276 } 2277 } 2278 2279 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2280 // false for isInterface call even when the original type is an interface. 2281 boolean implementing = clazztype.tsym.isInterface() || 2282 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2283 2284 if (implementing) { 2285 cdef.implementing = List.of(clazz); 2286 } else { 2287 cdef.extending = clazz; 2288 } 2289 2290 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2291 isSerializable(clazztype)) { 2292 localEnv.info.isSerializable = true; 2293 } 2294 2295 attribStat(cdef, localEnv); 2296 2297 List<Type> finalargtypes; 2298 // If an outer instance is given, 2299 // prefix it to the constructor arguments 2300 // and delete it from the new expression 2301 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2302 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2303 finalargtypes = argtypes.prepend(tree.encl.type); 2304 tree.encl = null; 2305 } else { 2306 finalargtypes = argtypes; 2307 } 2308 2309 // Reassign clazztype and recompute constructor. As this necessarily involves 2310 // another attribution pass for deferred types in the case of <>, replicate 2311 // them. Original arguments have right decorations already. 2312 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2313 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2314 } 2315 2316 clazztype = cdef.sym.type; 2317 Symbol sym = tree.constructor = rs.resolveConstructor( 2318 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2319 Assert.check(!sym.kind.isResolutionError()); 2320 tree.constructor = sym; 2321 tree.constructorType = checkId(tree, 2322 clazztype, 2323 tree.constructor, 2324 localEnv, 2325 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2326 } 2327 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2328 clazztype : types.createErrorType(tree.type); 2329 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2330 chk.validate(tree.typeargs, localEnv); 2331 } 2332 2333 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2334 return new Check.NestedCheckContext(checkContext) { 2335 @Override 2336 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2337 enclosingContext.report(clazz.clazz, 2338 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2339 } 2340 }; 2341 } 2342 2343 /** Make an attributed null check tree. 2344 */ 2345 public JCExpression makeNullCheck(JCExpression arg) { 2346 // optimization: new Outer() can never be null; skip null check 2347 if (arg.getTag() == NEWCLASS) 2348 return arg; 2349 // optimization: X.this is never null; skip null check 2350 Name name = TreeInfo.name(arg); 2351 if (name == names._this || name == names._super) return arg; 2352 2353 JCTree.Tag optag = NULLCHK; 2354 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2355 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2356 tree.type = arg.type; 2357 return tree; 2358 } 2359 2360 public void visitNewArray(JCNewArray tree) { 2361 Type owntype = types.createErrorType(tree.type); 2362 Env<AttrContext> localEnv = env.dup(tree); 2363 Type elemtype; 2364 if (tree.elemtype != null) { 2365 elemtype = attribType(tree.elemtype, localEnv); 2366 chk.validate(tree.elemtype, localEnv); 2367 owntype = elemtype; 2368 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2369 attribExpr(l.head, localEnv, syms.intType); 2370 owntype = new ArrayType(owntype, syms.arrayClass); 2371 } 2372 } else { 2373 // we are seeing an untyped aggregate { ... } 2374 // this is allowed only if the prototype is an array 2375 if (pt().hasTag(ARRAY)) { 2376 elemtype = types.elemtype(pt()); 2377 } else { 2378 if (!pt().hasTag(ERROR)) { 2379 log.error(tree.pos(), "illegal.initializer.for.type", 2380 pt()); 2381 } 2382 elemtype = types.createErrorType(pt()); 2383 } 2384 } 2385 if (tree.elems != null) { 2386 attribExprs(tree.elems, localEnv, elemtype); 2387 owntype = new ArrayType(elemtype, syms.arrayClass); 2388 } 2389 if (!types.isReifiable(elemtype)) 2390 log.error(tree.pos(), "generic.array.creation"); 2391 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2392 } 2393 2394 /* 2395 * A lambda expression can only be attributed when a target-type is available. 2396 * In addition, if the target-type is that of a functional interface whose 2397 * descriptor contains inference variables in argument position the lambda expression 2398 * is 'stuck' (see DeferredAttr). 2399 */ 2400 @Override 2401 public void visitLambda(final JCLambda that) { 2402 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2403 if (pt().hasTag(NONE)) { 2404 //lambda only allowed in assignment or method invocation/cast context 2405 log.error(that.pos(), "unexpected.lambda"); 2406 } 2407 result = that.type = types.createErrorType(pt()); 2408 return; 2409 } 2410 //create an environment for attribution of the lambda expression 2411 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2412 boolean needsRecovery = 2413 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2414 try { 2415 if (needsRecovery && isSerializable(pt())) { 2416 localEnv.info.isSerializable = true; 2417 localEnv.info.isLambda = true; 2418 } 2419 List<Type> explicitParamTypes = null; 2420 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2421 //attribute lambda parameters 2422 attribStats(that.params, localEnv); 2423 explicitParamTypes = TreeInfo.types(that.params); 2424 } 2425 2426 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2427 Type currentTarget = targetInfo.target; 2428 Type lambdaType = targetInfo.descriptor; 2429 2430 if (currentTarget.isErroneous()) { 2431 result = that.type = currentTarget; 2432 return; 2433 } 2434 2435 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2436 2437 if (lambdaType.hasTag(FORALL)) { 2438 //lambda expression target desc cannot be a generic method 2439 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2440 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2441 result = that.type = types.createErrorType(pt()); 2442 return; 2443 } 2444 2445 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2446 //add param type info in the AST 2447 List<Type> actuals = lambdaType.getParameterTypes(); 2448 List<JCVariableDecl> params = that.params; 2449 2450 boolean arityMismatch = false; 2451 2452 while (params.nonEmpty()) { 2453 if (actuals.isEmpty()) { 2454 //not enough actuals to perform lambda parameter inference 2455 arityMismatch = true; 2456 } 2457 //reset previously set info 2458 Type argType = arityMismatch ? 2459 syms.errType : 2460 actuals.head; 2461 params.head.vartype = make.at(params.head).Type(argType); 2462 params.head.sym = null; 2463 actuals = actuals.isEmpty() ? 2464 actuals : 2465 actuals.tail; 2466 params = params.tail; 2467 } 2468 2469 //attribute lambda parameters 2470 attribStats(that.params, localEnv); 2471 2472 if (arityMismatch) { 2473 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2474 result = that.type = types.createErrorType(currentTarget); 2475 return; 2476 } 2477 } 2478 2479 //from this point on, no recovery is needed; if we are in assignment context 2480 //we will be able to attribute the whole lambda body, regardless of errors; 2481 //if we are in a 'check' method context, and the lambda is not compatible 2482 //with the target-type, it will be recovered anyway in Attr.checkId 2483 needsRecovery = false; 2484 2485 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2486 lambdaBodyResult(that, lambdaType, resultInfo); 2487 2488 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2489 attribTree(that.getBody(), localEnv, bodyResultInfo); 2490 } else { 2491 JCBlock body = (JCBlock)that.body; 2492 attribStats(body.stats, localEnv); 2493 } 2494 2495 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2496 2497 boolean isSpeculativeRound = 2498 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2499 2500 preFlow(that); 2501 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2502 2503 that.type = currentTarget; //avoids recovery at this stage 2504 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2505 2506 if (!isSpeculativeRound) { 2507 //add thrown types as bounds to the thrown types free variables if needed: 2508 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2509 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2510 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2511 2512 chk.unhandled(inferredThrownTypes, thrownTypes); 2513 2514 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 2515 thrownTypes.stream() 2516 .filter(t -> t.hasTag(UNDETVAR)) 2517 .forEach(t -> ((UndetVar)t).setThrow()); 2518 } 2519 2520 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2521 } 2522 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2523 } catch (Types.FunctionDescriptorLookupError ex) { 2524 JCDiagnostic cause = ex.getDiagnostic(); 2525 resultInfo.checkContext.report(that, cause); 2526 result = that.type = types.createErrorType(pt()); 2527 return; 2528 } catch (Throwable t) { 2529 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2530 //as that would likely cause the same exception again. 2531 needsRecovery = false; 2532 throw t; 2533 } finally { 2534 localEnv.info.scope.leave(); 2535 if (needsRecovery) { 2536 attribTree(that, env, recoveryInfo); 2537 } 2538 } 2539 } 2540 //where 2541 class TargetInfo { 2542 Type target; 2543 Type descriptor; 2544 2545 public TargetInfo(Type target, Type descriptor) { 2546 this.target = target; 2547 this.descriptor = descriptor; 2548 } 2549 } 2550 2551 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2552 Type lambdaType; 2553 Type currentTarget = resultInfo.pt; 2554 if (resultInfo.pt != Type.recoveryType) { 2555 /* We need to adjust the target. If the target is an 2556 * intersection type, for example: SAM & I1 & I2 ... 2557 * the target will be updated to SAM 2558 */ 2559 currentTarget = targetChecker.visit(currentTarget, that); 2560 if (explicitParamTypes != null) { 2561 currentTarget = infer.instantiateFunctionalInterface(that, 2562 currentTarget, explicitParamTypes, resultInfo.checkContext); 2563 } 2564 currentTarget = types.removeWildcards(currentTarget); 2565 lambdaType = types.findDescriptorType(currentTarget); 2566 } else { 2567 currentTarget = Type.recoveryType; 2568 lambdaType = fallbackDescriptorType(that); 2569 } 2570 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2571 //lambda expression target desc cannot be a generic method 2572 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2573 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2574 currentTarget = types.createErrorType(pt()); 2575 } 2576 return new TargetInfo(currentTarget, lambdaType); 2577 } 2578 2579 void preFlow(JCLambda tree) { 2580 new PostAttrAnalyzer() { 2581 @Override 2582 public void scan(JCTree tree) { 2583 if (tree == null || 2584 (tree.type != null && 2585 tree.type == Type.stuckType)) { 2586 //don't touch stuck expressions! 2587 return; 2588 } 2589 super.scan(tree); 2590 } 2591 }.scan(tree); 2592 } 2593 2594 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2595 2596 @Override 2597 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2598 return t.isIntersection() ? 2599 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2600 } 2601 2602 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2603 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2604 Type target = null; 2605 for (Type bound : ict.getExplicitComponents()) { 2606 TypeSymbol boundSym = bound.tsym; 2607 if (types.isFunctionalInterface(boundSym) && 2608 types.findDescriptorSymbol(boundSym) == desc) { 2609 target = bound; 2610 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2611 //bound must be an interface 2612 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2613 } 2614 } 2615 return target != null ? 2616 target : 2617 ict.getExplicitComponents().head; //error recovery 2618 } 2619 2620 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2621 ListBuffer<Type> targs = new ListBuffer<>(); 2622 ListBuffer<Type> supertypes = new ListBuffer<>(); 2623 for (Type i : ict.interfaces_field) { 2624 if (i.isParameterized()) { 2625 targs.appendList(i.tsym.type.allparams()); 2626 } 2627 supertypes.append(i.tsym.type); 2628 } 2629 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2630 notionalIntf.allparams_field = targs.toList(); 2631 notionalIntf.tsym.flags_field |= INTERFACE; 2632 return notionalIntf.tsym; 2633 } 2634 2635 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2636 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2637 diags.fragment(key, args))); 2638 } 2639 }; 2640 2641 private Type fallbackDescriptorType(JCExpression tree) { 2642 switch (tree.getTag()) { 2643 case LAMBDA: 2644 JCLambda lambda = (JCLambda)tree; 2645 List<Type> argtypes = List.nil(); 2646 for (JCVariableDecl param : lambda.params) { 2647 argtypes = param.vartype != null ? 2648 argtypes.append(param.vartype.type) : 2649 argtypes.append(syms.errType); 2650 } 2651 return new MethodType(argtypes, Type.recoveryType, 2652 List.of(syms.throwableType), syms.methodClass); 2653 case REFERENCE: 2654 return new MethodType(List.nil(), Type.recoveryType, 2655 List.of(syms.throwableType), syms.methodClass); 2656 default: 2657 Assert.error("Cannot get here!"); 2658 } 2659 return null; 2660 } 2661 2662 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2663 final InferenceContext inferenceContext, final Type... ts) { 2664 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2665 } 2666 2667 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2668 final InferenceContext inferenceContext, final List<Type> ts) { 2669 if (inferenceContext.free(ts)) { 2670 inferenceContext.addFreeTypeListener(ts, 2671 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts))); 2672 } else { 2673 for (Type t : ts) { 2674 rs.checkAccessibleType(env, t); 2675 } 2676 } 2677 } 2678 2679 /** 2680 * Lambda/method reference have a special check context that ensures 2681 * that i.e. a lambda return type is compatible with the expected 2682 * type according to both the inherited context and the assignment 2683 * context. 2684 */ 2685 class FunctionalReturnContext extends Check.NestedCheckContext { 2686 2687 FunctionalReturnContext(CheckContext enclosingContext) { 2688 super(enclosingContext); 2689 } 2690 2691 @Override 2692 public boolean compatible(Type found, Type req, Warner warn) { 2693 //return type must be compatible in both current context and assignment context 2694 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 2695 } 2696 2697 @Override 2698 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2699 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2700 } 2701 } 2702 2703 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2704 2705 JCExpression expr; 2706 boolean expStmtExpected; 2707 2708 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2709 super(enclosingContext); 2710 this.expr = expr; 2711 } 2712 2713 @Override 2714 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2715 if (expStmtExpected) { 2716 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 2717 } else { 2718 super.report(pos, details); 2719 } 2720 } 2721 2722 @Override 2723 public boolean compatible(Type found, Type req, Warner warn) { 2724 //a void return is compatible with an expression statement lambda 2725 if (req.hasTag(VOID)) { 2726 expStmtExpected = true; 2727 return TreeInfo.isExpressionStatement(expr); 2728 } else { 2729 return super.compatible(found, req, warn); 2730 } 2731 } 2732 } 2733 2734 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2735 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2736 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2737 new FunctionalReturnContext(resultInfo.checkContext); 2738 2739 return descriptor.getReturnType() == Type.recoveryType ? 2740 recoveryInfo : 2741 new ResultInfo(KindSelector.VAL, 2742 descriptor.getReturnType(), funcContext); 2743 } 2744 2745 /** 2746 * Lambda compatibility. Check that given return types, thrown types, parameter types 2747 * are compatible with the expected functional interface descriptor. This means that: 2748 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2749 * types must be compatible with the return type of the expected descriptor. 2750 */ 2751 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2752 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2753 2754 //return values have already been checked - but if lambda has no return 2755 //values, we must ensure that void/value compatibility is correct; 2756 //this amounts at checking that, if a lambda body can complete normally, 2757 //the descriptor's return type must be void 2758 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2759 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2760 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2761 diags.fragment("missing.ret.val", returnType))); 2762 } 2763 2764 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2765 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2766 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2767 } 2768 } 2769 2770 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2771 * static field and that lambda has type annotations, these annotations will 2772 * also be stored at these fake clinit methods. 2773 * 2774 * LambdaToMethod also use fake clinit methods so they can be reused. 2775 * Also as LTM is a phase subsequent to attribution, the methods from 2776 * clinits can be safely removed by LTM to save memory. 2777 */ 2778 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2779 2780 public MethodSymbol removeClinit(ClassSymbol sym) { 2781 return clinits.remove(sym); 2782 } 2783 2784 /* This method returns an environment to be used to attribute a lambda 2785 * expression. 2786 * 2787 * The owner of this environment is a method symbol. If the current owner 2788 * is not a method, for example if the lambda is used to initialize 2789 * a field, then if the field is: 2790 * 2791 * - an instance field, we use the first constructor. 2792 * - a static field, we create a fake clinit method. 2793 */ 2794 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2795 Env<AttrContext> lambdaEnv; 2796 Symbol owner = env.info.scope.owner; 2797 if (owner.kind == VAR && owner.owner.kind == TYP) { 2798 //field initializer 2799 ClassSymbol enclClass = owner.enclClass(); 2800 Symbol newScopeOwner = env.info.scope.owner; 2801 /* if the field isn't static, then we can get the first constructor 2802 * and use it as the owner of the environment. This is what 2803 * LTM code is doing to look for type annotations so we are fine. 2804 */ 2805 if ((owner.flags() & STATIC) == 0) { 2806 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2807 newScopeOwner = s; 2808 break; 2809 } 2810 } else { 2811 /* if the field is static then we need to create a fake clinit 2812 * method, this method can later be reused by LTM. 2813 */ 2814 MethodSymbol clinit = clinits.get(enclClass); 2815 if (clinit == null) { 2816 Type clinitType = new MethodType(List.nil(), 2817 syms.voidType, List.nil(), syms.methodClass); 2818 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2819 names.clinit, clinitType, enclClass); 2820 clinit.params = List.nil(); 2821 clinits.put(enclClass, clinit); 2822 } 2823 newScopeOwner = clinit; 2824 } 2825 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2826 } else { 2827 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2828 } 2829 return lambdaEnv; 2830 } 2831 2832 @Override 2833 public void visitReference(final JCMemberReference that) { 2834 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2835 if (pt().hasTag(NONE)) { 2836 //method reference only allowed in assignment or method invocation/cast context 2837 log.error(that.pos(), "unexpected.mref"); 2838 } 2839 result = that.type = types.createErrorType(pt()); 2840 return; 2841 } 2842 final Env<AttrContext> localEnv = env.dup(that); 2843 try { 2844 //attribute member reference qualifier - if this is a constructor 2845 //reference, the expected kind must be a type 2846 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2847 2848 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2849 exprType = chk.checkConstructorRefType(that.expr, exprType); 2850 if (!exprType.isErroneous() && 2851 exprType.isRaw() && 2852 that.typeargs != null) { 2853 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2854 diags.fragment("mref.infer.and.explicit.params")); 2855 exprType = types.createErrorType(exprType); 2856 } 2857 } 2858 2859 if (exprType.isErroneous()) { 2860 //if the qualifier expression contains problems, 2861 //give up attribution of method reference 2862 result = that.type = exprType; 2863 return; 2864 } 2865 2866 if (TreeInfo.isStaticSelector(that.expr, names)) { 2867 //if the qualifier is a type, validate it; raw warning check is 2868 //omitted as we don't know at this stage as to whether this is a 2869 //raw selector (because of inference) 2870 chk.validate(that.expr, env, false); 2871 } else { 2872 Symbol lhsSym = TreeInfo.symbol(that.expr); 2873 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2874 } 2875 //attrib type-arguments 2876 List<Type> typeargtypes = List.nil(); 2877 if (that.typeargs != null) { 2878 typeargtypes = attribTypes(that.typeargs, localEnv); 2879 } 2880 2881 boolean isTargetSerializable = 2882 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2883 isSerializable(pt()); 2884 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2885 Type currentTarget = targetInfo.target; 2886 Type desc = targetInfo.descriptor; 2887 2888 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2889 List<Type> argtypes = desc.getParameterTypes(); 2890 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2891 2892 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2893 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2894 } 2895 2896 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2897 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2898 try { 2899 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2900 that.name, argtypes, typeargtypes, referenceCheck, 2901 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2902 } finally { 2903 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2904 } 2905 2906 Symbol refSym = refResult.fst; 2907 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2908 2909 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2910 * JDK-8075541 2911 */ 2912 if (refSym.kind != MTH) { 2913 boolean targetError; 2914 switch (refSym.kind) { 2915 case ABSENT_MTH: 2916 case MISSING_ENCL: 2917 targetError = false; 2918 break; 2919 case WRONG_MTH: 2920 case WRONG_MTHS: 2921 case AMBIGUOUS: 2922 case HIDDEN: 2923 case STATICERR: 2924 targetError = true; 2925 break; 2926 default: 2927 Assert.error("unexpected result kind " + refSym.kind); 2928 targetError = false; 2929 } 2930 2931 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2932 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2933 2934 JCDiagnostic.DiagnosticType diagKind = targetError ? 2935 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2936 2937 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2938 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2939 2940 if (targetError && currentTarget == Type.recoveryType) { 2941 //a target error doesn't make sense during recovery stage 2942 //as we don't know what actual parameter types are 2943 result = that.type = currentTarget; 2944 return; 2945 } else { 2946 if (targetError) { 2947 resultInfo.checkContext.report(that, diag); 2948 } else { 2949 log.report(diag); 2950 } 2951 result = that.type = types.createErrorType(currentTarget); 2952 return; 2953 } 2954 } 2955 2956 that.sym = refSym.baseSymbol(); 2957 that.kind = lookupHelper.referenceKind(that.sym); 2958 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2959 2960 if (desc.getReturnType() == Type.recoveryType) { 2961 // stop here 2962 result = that.type = currentTarget; 2963 return; 2964 } 2965 2966 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2967 Type enclosingType = exprType.getEnclosingType(); 2968 if (enclosingType != null && enclosingType.hasTag(CLASS)) { 2969 // Check for the existence of an apropriate outer instance 2970 rs.resolveImplicitThis(that.pos(), env, exprType); 2971 } 2972 } 2973 2974 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2975 2976 if (that.getMode() == ReferenceMode.INVOKE && 2977 TreeInfo.isStaticSelector(that.expr, names) && 2978 that.kind.isUnbound() && 2979 !desc.getParameterTypes().head.isParameterized()) { 2980 chk.checkRaw(that.expr, localEnv); 2981 } 2982 2983 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2984 exprType.getTypeArguments().nonEmpty()) { 2985 //static ref with class type-args 2986 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2987 diags.fragment("static.mref.with.targs")); 2988 result = that.type = types.createErrorType(currentTarget); 2989 return; 2990 } 2991 2992 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2993 // Check that super-qualified symbols are not abstract (JLS) 2994 rs.checkNonAbstract(that.pos(), that.sym); 2995 } 2996 2997 if (isTargetSerializable) { 2998 chk.checkAccessFromSerializableElement(that, true); 2999 } 3000 } 3001 3002 ResultInfo checkInfo = 3003 resultInfo.dup(newMethodTemplate( 3004 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 3005 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 3006 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 3007 3008 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 3009 3010 if (that.kind.isUnbound() && 3011 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 3012 //re-generate inference constraints for unbound receiver 3013 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 3014 //cannot happen as this has already been checked - we just need 3015 //to regenerate the inference constraints, as that has been lost 3016 //as a result of the call to inferenceContext.save() 3017 Assert.error("Can't get here"); 3018 } 3019 } 3020 3021 if (!refType.isErroneous()) { 3022 refType = types.createMethodTypeWithReturn(refType, 3023 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3024 } 3025 3026 //go ahead with standard method reference compatibility check - note that param check 3027 //is a no-op (as this has been taken care during method applicability) 3028 boolean isSpeculativeRound = 3029 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3030 3031 that.type = currentTarget; //avoids recovery at this stage 3032 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3033 if (!isSpeculativeRound) { 3034 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3035 } 3036 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3037 } catch (Types.FunctionDescriptorLookupError ex) { 3038 JCDiagnostic cause = ex.getDiagnostic(); 3039 resultInfo.checkContext.report(that, cause); 3040 result = that.type = types.createErrorType(pt()); 3041 return; 3042 } 3043 } 3044 //where 3045 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3046 //if this is a constructor reference, the expected kind must be a type 3047 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3048 KindSelector.VAL_TYP : KindSelector.TYP, 3049 Type.noType); 3050 } 3051 3052 3053 @SuppressWarnings("fallthrough") 3054 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3055 InferenceContext inferenceContext = checkContext.inferenceContext(); 3056 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3057 3058 Type resType; 3059 switch (tree.getMode()) { 3060 case NEW: 3061 if (!tree.expr.type.isRaw()) { 3062 resType = tree.expr.type; 3063 break; 3064 } 3065 default: 3066 resType = refType.getReturnType(); 3067 } 3068 3069 Type incompatibleReturnType = resType; 3070 3071 if (returnType.hasTag(VOID)) { 3072 incompatibleReturnType = null; 3073 } 3074 3075 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3076 if (resType.isErroneous() || 3077 new FunctionalReturnContext(checkContext).compatible(resType, returnType, 3078 checkContext.checkWarner(tree, resType, returnType))) { 3079 incompatibleReturnType = null; 3080 } 3081 } 3082 3083 if (incompatibleReturnType != null) { 3084 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3085 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3086 } else { 3087 if (inferenceContext.free(refType)) { 3088 // we need to wait for inference to finish and then replace inference vars in the referent type 3089 inferenceContext.addFreeTypeListener(List.of(refType), 3090 instantiatedContext -> { 3091 tree.referentType = instantiatedContext.asInstType(refType); 3092 }); 3093 } else { 3094 tree.referentType = refType; 3095 } 3096 } 3097 3098 if (!speculativeAttr) { 3099 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3100 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3101 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3102 } 3103 //18.2.5: "In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej" 3104 thrownTypes.stream() 3105 .filter(t -> t.hasTag(UNDETVAR)) 3106 .forEach(t -> ((UndetVar)t).setThrow()); 3107 } 3108 } 3109 3110 /** 3111 * Set functional type info on the underlying AST. Note: as the target descriptor 3112 * might contain inference variables, we might need to register an hook in the 3113 * current inference context. 3114 */ 3115 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3116 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3117 if (checkContext.inferenceContext().free(descriptorType)) { 3118 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), 3119 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3120 inferenceContext.asInstType(primaryTarget), checkContext)); 3121 } else { 3122 ListBuffer<Type> targets = new ListBuffer<>(); 3123 if (pt.hasTag(CLASS)) { 3124 if (pt.isCompound()) { 3125 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3126 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3127 if (t != primaryTarget) { 3128 targets.append(types.removeWildcards(t)); 3129 } 3130 } 3131 } else { 3132 targets.append(types.removeWildcards(primaryTarget)); 3133 } 3134 } 3135 fExpr.targets = targets.toList(); 3136 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3137 pt != Type.recoveryType) { 3138 //check that functional interface class is well-formed 3139 try { 3140 /* Types.makeFunctionalInterfaceClass() may throw an exception 3141 * when it's executed post-inference. See the listener code 3142 * above. 3143 */ 3144 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3145 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3146 if (csym != null) { 3147 chk.checkImplementations(env.tree, csym, csym); 3148 try { 3149 //perform an additional functional interface check on the synthetic class, 3150 //as there may be spurious errors for raw targets - because of existing issues 3151 //with membership and inheritance (see JDK-8074570). 3152 csym.flags_field |= INTERFACE; 3153 types.findDescriptorType(csym.type); 3154 } catch (FunctionDescriptorLookupError err) { 3155 resultInfo.checkContext.report(fExpr, 3156 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3157 } 3158 } 3159 } catch (Types.FunctionDescriptorLookupError ex) { 3160 JCDiagnostic cause = ex.getDiagnostic(); 3161 resultInfo.checkContext.report(env.tree, cause); 3162 } 3163 } 3164 } 3165 } 3166 3167 public void visitParens(JCParens tree) { 3168 Type owntype = attribTree(tree.expr, env, resultInfo); 3169 result = check(tree, owntype, pkind(), resultInfo); 3170 Symbol sym = TreeInfo.symbol(tree); 3171 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3172 log.error(tree.pos(), "illegal.start.of.type"); 3173 } 3174 3175 public void visitAssign(JCAssign tree) { 3176 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3177 Type capturedType = capture(owntype); 3178 attribExpr(tree.rhs, env, owntype); 3179 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3180 } 3181 3182 public void visitAssignop(JCAssignOp tree) { 3183 // Attribute arguments. 3184 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3185 Type operand = attribExpr(tree.rhs, env); 3186 // Find operator. 3187 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3188 if (operator != operators.noOpSymbol && 3189 !owntype.isErroneous() && 3190 !operand.isErroneous()) { 3191 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3192 chk.checkCastable(tree.rhs.pos(), 3193 operator.type.getReturnType(), 3194 owntype); 3195 } 3196 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3197 } 3198 3199 public void visitUnary(JCUnary tree) { 3200 // Attribute arguments. 3201 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3202 ? attribTree(tree.arg, env, varAssignmentInfo) 3203 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3204 3205 // Find operator. 3206 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3207 Type owntype = types.createErrorType(tree.type); 3208 if (operator != operators.noOpSymbol && 3209 !argtype.isErroneous()) { 3210 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3211 ? tree.arg.type 3212 : operator.type.getReturnType(); 3213 int opc = ((OperatorSymbol)operator).opcode; 3214 3215 // If the argument is constant, fold it. 3216 if (argtype.constValue() != null) { 3217 Type ctype = cfolder.fold1(opc, argtype); 3218 if (ctype != null) { 3219 owntype = cfolder.coerce(ctype, owntype); 3220 } 3221 } 3222 } 3223 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3224 } 3225 3226 public void visitBinary(JCBinary tree) { 3227 // Attribute arguments. 3228 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3229 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3230 // Find operator. 3231 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3232 Type owntype = types.createErrorType(tree.type); 3233 if (operator != operators.noOpSymbol && 3234 !left.isErroneous() && 3235 !right.isErroneous()) { 3236 owntype = operator.type.getReturnType(); 3237 int opc = ((OperatorSymbol)operator).opcode; 3238 // If both arguments are constants, fold them. 3239 if (left.constValue() != null && right.constValue() != null) { 3240 Type ctype = cfolder.fold2(opc, left, right); 3241 if (ctype != null) { 3242 owntype = cfolder.coerce(ctype, owntype); 3243 } 3244 } 3245 3246 // Check that argument types of a reference ==, != are 3247 // castable to each other, (JLS 15.21). Note: unboxing 3248 // comparisons will not have an acmp* opc at this point. 3249 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3250 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3251 log.error(tree.pos(), "incomparable.types", left, right); 3252 } 3253 } 3254 3255 chk.checkDivZero(tree.rhs.pos(), operator, right); 3256 } 3257 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3258 } 3259 3260 public void visitTypeCast(final JCTypeCast tree) { 3261 Type clazztype = attribType(tree.clazz, env); 3262 chk.validate(tree.clazz, env, false); 3263 //a fresh environment is required for 292 inference to work properly --- 3264 //see Infer.instantiatePolymorphicSignatureInstance() 3265 Env<AttrContext> localEnv = env.dup(tree); 3266 //should we propagate the target type? 3267 final ResultInfo castInfo; 3268 JCExpression expr = TreeInfo.skipParens(tree.expr); 3269 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3270 if (isPoly) { 3271 //expression is a poly - we need to propagate target type info 3272 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3273 new Check.NestedCheckContext(resultInfo.checkContext) { 3274 @Override 3275 public boolean compatible(Type found, Type req, Warner warn) { 3276 return types.isCastable(found, req, warn); 3277 } 3278 }); 3279 } else { 3280 //standalone cast - target-type info is not propagated 3281 castInfo = unknownExprInfo; 3282 } 3283 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3284 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3285 if (exprtype.constValue() != null) 3286 owntype = cfolder.coerce(exprtype, owntype); 3287 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3288 if (!isPoly) 3289 chk.checkRedundantCast(localEnv, tree); 3290 } 3291 3292 public void visitTypeTest(JCInstanceOf tree) { 3293 Type exprtype = chk.checkNullOrRefType( 3294 tree.expr.pos(), attribExpr(tree.expr, env)); 3295 Type clazztype = attribType(tree.clazz, env); 3296 if (!clazztype.hasTag(TYPEVAR)) { 3297 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3298 } 3299 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3300 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3301 clazztype = types.createErrorType(clazztype); 3302 } 3303 chk.validate(tree.clazz, env, false); 3304 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3305 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3306 } 3307 3308 public void visitIndexed(JCArrayAccess tree) { 3309 Type owntype = types.createErrorType(tree.type); 3310 Type atype = attribExpr(tree.indexed, env); 3311 attribExpr(tree.index, env, syms.intType); 3312 if (types.isArray(atype)) 3313 owntype = types.elemtype(atype); 3314 else if (!atype.hasTag(ERROR)) 3315 log.error(tree.pos(), "array.req.but.found", atype); 3316 if (!pkind().contains(KindSelector.VAL)) 3317 owntype = capture(owntype); 3318 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3319 } 3320 3321 public void visitIdent(JCIdent tree) { 3322 Symbol sym; 3323 3324 // Find symbol 3325 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3326 // If we are looking for a method, the prototype `pt' will be a 3327 // method type with the type of the call's arguments as parameters. 3328 env.info.pendingResolutionPhase = null; 3329 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3330 } else if (tree.sym != null && tree.sym.kind != VAR) { 3331 sym = tree.sym; 3332 } else { 3333 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3334 } 3335 tree.sym = sym; 3336 3337 // (1) Also find the environment current for the class where 3338 // sym is defined (`symEnv'). 3339 // Only for pre-tiger versions (1.4 and earlier): 3340 // (2) Also determine whether we access symbol out of an anonymous 3341 // class in a this or super call. This is illegal for instance 3342 // members since such classes don't carry a this$n link. 3343 // (`noOuterThisPath'). 3344 Env<AttrContext> symEnv = env; 3345 boolean noOuterThisPath = false; 3346 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3347 sym.kind.matches(KindSelector.VAL_MTH) && 3348 sym.owner.kind == TYP && 3349 tree.name != names._this && tree.name != names._super) { 3350 3351 // Find environment in which identifier is defined. 3352 while (symEnv.outer != null && 3353 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3354 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3355 noOuterThisPath = false; 3356 symEnv = symEnv.outer; 3357 } 3358 } 3359 3360 // If symbol is a variable, ... 3361 if (sym.kind == VAR) { 3362 VarSymbol v = (VarSymbol)sym; 3363 3364 // ..., evaluate its initializer, if it has one, and check for 3365 // illegal forward reference. 3366 checkInit(tree, env, v, false); 3367 3368 // If we are expecting a variable (as opposed to a value), check 3369 // that the variable is assignable in the current environment. 3370 if (KindSelector.ASG.subset(pkind())) 3371 checkAssignable(tree.pos(), v, null, env); 3372 } 3373 3374 // In a constructor body, 3375 // if symbol is a field or instance method, check that it is 3376 // not accessed before the supertype constructor is called. 3377 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3378 sym.kind.matches(KindSelector.VAL_MTH) && 3379 sym.owner.kind == TYP && 3380 (sym.flags() & STATIC) == 0) { 3381 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3382 sym : thisSym(tree.pos(), env)); 3383 } 3384 Env<AttrContext> env1 = env; 3385 if (sym.kind != ERR && sym.kind != TYP && 3386 sym.owner != null && sym.owner != env1.enclClass.sym) { 3387 // If the found symbol is inaccessible, then it is 3388 // accessed through an enclosing instance. Locate this 3389 // enclosing instance: 3390 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3391 env1 = env1.outer; 3392 } 3393 3394 if (env.info.isSerializable) { 3395 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3396 } 3397 3398 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3399 } 3400 3401 public void visitSelect(JCFieldAccess tree) { 3402 // Determine the expected kind of the qualifier expression. 3403 KindSelector skind = KindSelector.NIL; 3404 if (tree.name == names._this || tree.name == names._super || 3405 tree.name == names._class) 3406 { 3407 skind = KindSelector.TYP; 3408 } else { 3409 if (pkind().contains(KindSelector.PCK)) 3410 skind = KindSelector.of(skind, KindSelector.PCK); 3411 if (pkind().contains(KindSelector.TYP)) 3412 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3413 if (pkind().contains(KindSelector.VAL_MTH)) 3414 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3415 } 3416 3417 // Attribute the qualifier expression, and determine its symbol (if any). 3418 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3419 if (!pkind().contains(KindSelector.TYP_PCK)) 3420 site = capture(site); // Capture field access 3421 3422 // don't allow T.class T[].class, etc 3423 if (skind == KindSelector.TYP) { 3424 Type elt = site; 3425 while (elt.hasTag(ARRAY)) 3426 elt = ((ArrayType)elt).elemtype; 3427 if (elt.hasTag(TYPEVAR)) { 3428 log.error(tree.pos(), "type.var.cant.be.deref"); 3429 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3430 tree.sym = tree.type.tsym; 3431 return ; 3432 } 3433 } 3434 3435 // If qualifier symbol is a type or `super', assert `selectSuper' 3436 // for the selection. This is relevant for determining whether 3437 // protected symbols are accessible. 3438 Symbol sitesym = TreeInfo.symbol(tree.selected); 3439 boolean selectSuperPrev = env.info.selectSuper; 3440 env.info.selectSuper = 3441 sitesym != null && 3442 sitesym.name == names._super; 3443 3444 // Determine the symbol represented by the selection. 3445 env.info.pendingResolutionPhase = null; 3446 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3447 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3448 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3449 sym = syms.errSymbol; 3450 } 3451 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3452 site = capture(site); 3453 sym = selectSym(tree, sitesym, site, env, resultInfo); 3454 } 3455 boolean varArgs = env.info.lastResolveVarargs(); 3456 tree.sym = sym; 3457 3458 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3459 site = types.skipTypeVars(site, true); 3460 } 3461 3462 // If that symbol is a variable, ... 3463 if (sym.kind == VAR) { 3464 VarSymbol v = (VarSymbol)sym; 3465 3466 // ..., evaluate its initializer, if it has one, and check for 3467 // illegal forward reference. 3468 checkInit(tree, env, v, true); 3469 3470 // If we are expecting a variable (as opposed to a value), check 3471 // that the variable is assignable in the current environment. 3472 if (KindSelector.ASG.subset(pkind())) 3473 checkAssignable(tree.pos(), v, tree.selected, env); 3474 } 3475 3476 if (sitesym != null && 3477 sitesym.kind == VAR && 3478 ((VarSymbol)sitesym).isResourceVariable() && 3479 sym.kind == MTH && 3480 sym.name.equals(names.close) && 3481 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3482 env.info.lint.isEnabled(LintCategory.TRY)) { 3483 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3484 } 3485 3486 // Disallow selecting a type from an expression 3487 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3488 tree.type = check(tree.selected, pt(), 3489 sitesym == null ? 3490 KindSelector.VAL : sitesym.kind.toSelector(), 3491 new ResultInfo(KindSelector.TYP_PCK, pt())); 3492 } 3493 3494 if (isType(sitesym)) { 3495 if (sym.name == names._this) { 3496 // If `C' is the currently compiled class, check that 3497 // C.this' does not appear in a call to a super(...) 3498 if (env.info.isSelfCall && 3499 site.tsym == env.enclClass.sym) { 3500 chk.earlyRefError(tree.pos(), sym); 3501 } 3502 } else { 3503 // Check if type-qualified fields or methods are static (JLS) 3504 if ((sym.flags() & STATIC) == 0 && 3505 sym.name != names._super && 3506 (sym.kind == VAR || sym.kind == MTH)) { 3507 rs.accessBase(rs.new StaticError(sym), 3508 tree.pos(), site, sym.name, true); 3509 } 3510 } 3511 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3512 sym.isStatic() && sym.kind == MTH) { 3513 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3514 } 3515 } else if (sym.kind != ERR && 3516 (sym.flags() & STATIC) != 0 && 3517 sym.name != names._class) { 3518 // If the qualified item is not a type and the selected item is static, report 3519 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3520 chk.warnStatic(tree, "static.not.qualified.by.type", 3521 sym.kind.kindName(), sym.owner); 3522 } 3523 3524 // If we are selecting an instance member via a `super', ... 3525 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3526 3527 // Check that super-qualified symbols are not abstract (JLS) 3528 rs.checkNonAbstract(tree.pos(), sym); 3529 3530 if (site.isRaw()) { 3531 // Determine argument types for site. 3532 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3533 if (site1 != null) site = site1; 3534 } 3535 } 3536 3537 if (env.info.isSerializable) { 3538 chk.checkAccessFromSerializableElement(tree, env.info.isLambda); 3539 } 3540 3541 env.info.selectSuper = selectSuperPrev; 3542 result = checkId(tree, site, sym, env, resultInfo); 3543 } 3544 //where 3545 /** Determine symbol referenced by a Select expression, 3546 * 3547 * @param tree The select tree. 3548 * @param site The type of the selected expression, 3549 * @param env The current environment. 3550 * @param resultInfo The current result. 3551 */ 3552 private Symbol selectSym(JCFieldAccess tree, 3553 Symbol location, 3554 Type site, 3555 Env<AttrContext> env, 3556 ResultInfo resultInfo) { 3557 DiagnosticPosition pos = tree.pos(); 3558 Name name = tree.name; 3559 switch (site.getTag()) { 3560 case PACKAGE: 3561 return rs.accessBase( 3562 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3563 pos, location, site, name, true); 3564 case ARRAY: 3565 case CLASS: 3566 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3567 return rs.resolveQualifiedMethod( 3568 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3569 } else if (name == names._this || name == names._super) { 3570 return rs.resolveSelf(pos, env, site.tsym, name); 3571 } else if (name == names._class) { 3572 // In this case, we have already made sure in 3573 // visitSelect that qualifier expression is a type. 3574 Type t = syms.classType; 3575 List<Type> typeargs = List.of(types.erasure(site)); 3576 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3577 return new VarSymbol( 3578 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3579 } else { 3580 // We are seeing a plain identifier as selector. 3581 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3582 sym = rs.accessBase(sym, pos, location, site, name, true); 3583 return sym; 3584 } 3585 case WILDCARD: 3586 throw new AssertionError(tree); 3587 case TYPEVAR: 3588 // Normally, site.getUpperBound() shouldn't be null. 3589 // It should only happen during memberEnter/attribBase 3590 // when determining the super type which *must* beac 3591 // done before attributing the type variables. In 3592 // other words, we are seeing this illegal program: 3593 // class B<T> extends A<T.foo> {} 3594 Symbol sym = (site.getUpperBound() != null) 3595 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3596 : null; 3597 if (sym == null) { 3598 log.error(pos, "type.var.cant.be.deref"); 3599 return syms.errSymbol; 3600 } else { 3601 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3602 rs.new AccessError(env, site, sym) : 3603 sym; 3604 rs.accessBase(sym2, pos, location, site, name, true); 3605 return sym; 3606 } 3607 case ERROR: 3608 // preserve identifier names through errors 3609 return types.createErrorType(name, site.tsym, site).tsym; 3610 default: 3611 // The qualifier expression is of a primitive type -- only 3612 // .class is allowed for these. 3613 if (name == names._class) { 3614 // In this case, we have already made sure in Select that 3615 // qualifier expression is a type. 3616 Type t = syms.classType; 3617 Type arg = types.boxedClass(site).type; 3618 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3619 return new VarSymbol( 3620 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3621 } else { 3622 log.error(pos, "cant.deref", site); 3623 return syms.errSymbol; 3624 } 3625 } 3626 } 3627 3628 /** Determine type of identifier or select expression and check that 3629 * (1) the referenced symbol is not deprecated 3630 * (2) the symbol's type is safe (@see checkSafe) 3631 * (3) if symbol is a variable, check that its type and kind are 3632 * compatible with the prototype and protokind. 3633 * (4) if symbol is an instance field of a raw type, 3634 * which is being assigned to, issue an unchecked warning if its 3635 * type changes under erasure. 3636 * (5) if symbol is an instance method of a raw type, issue an 3637 * unchecked warning if its argument types change under erasure. 3638 * If checks succeed: 3639 * If symbol is a constant, return its constant type 3640 * else if symbol is a method, return its result type 3641 * otherwise return its type. 3642 * Otherwise return errType. 3643 * 3644 * @param tree The syntax tree representing the identifier 3645 * @param site If this is a select, the type of the selected 3646 * expression, otherwise the type of the current class. 3647 * @param sym The symbol representing the identifier. 3648 * @param env The current environment. 3649 * @param resultInfo The expected result 3650 */ 3651 Type checkId(JCTree tree, 3652 Type site, 3653 Symbol sym, 3654 Env<AttrContext> env, 3655 ResultInfo resultInfo) { 3656 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3657 checkMethodId(tree, site, sym, env, resultInfo) : 3658 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3659 } 3660 3661 Type checkMethodId(JCTree tree, 3662 Type site, 3663 Symbol sym, 3664 Env<AttrContext> env, 3665 ResultInfo resultInfo) { 3666 boolean isPolymorhicSignature = 3667 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3668 return isPolymorhicSignature ? 3669 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3670 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3671 } 3672 3673 Type checkSigPolyMethodId(JCTree tree, 3674 Type site, 3675 Symbol sym, 3676 Env<AttrContext> env, 3677 ResultInfo resultInfo) { 3678 //recover original symbol for signature polymorphic methods 3679 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3680 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3681 return sym.type; 3682 } 3683 3684 Type checkMethodIdInternal(JCTree tree, 3685 Type site, 3686 Symbol sym, 3687 Env<AttrContext> env, 3688 ResultInfo resultInfo) { 3689 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3690 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3691 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3692 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3693 return owntype; 3694 } else { 3695 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3696 } 3697 } 3698 3699 Type checkIdInternal(JCTree tree, 3700 Type site, 3701 Symbol sym, 3702 Type pt, 3703 Env<AttrContext> env, 3704 ResultInfo resultInfo) { 3705 if (pt.isErroneous()) { 3706 return types.createErrorType(site); 3707 } 3708 Type owntype; // The computed type of this identifier occurrence. 3709 switch (sym.kind) { 3710 case TYP: 3711 // For types, the computed type equals the symbol's type, 3712 // except for two situations: 3713 owntype = sym.type; 3714 if (owntype.hasTag(CLASS)) { 3715 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3716 Type ownOuter = owntype.getEnclosingType(); 3717 3718 // (a) If the symbol's type is parameterized, erase it 3719 // because no type parameters were given. 3720 // We recover generic outer type later in visitTypeApply. 3721 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3722 owntype = types.erasure(owntype); 3723 } 3724 3725 // (b) If the symbol's type is an inner class, then 3726 // we have to interpret its outer type as a superclass 3727 // of the site type. Example: 3728 // 3729 // class Tree<A> { class Visitor { ... } } 3730 // class PointTree extends Tree<Point> { ... } 3731 // ...PointTree.Visitor... 3732 // 3733 // Then the type of the last expression above is 3734 // Tree<Point>.Visitor. 3735 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3736 Type normOuter = site; 3737 if (normOuter.hasTag(CLASS)) { 3738 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3739 } 3740 if (normOuter == null) // perhaps from an import 3741 normOuter = types.erasure(ownOuter); 3742 if (normOuter != ownOuter) 3743 owntype = new ClassType( 3744 normOuter, List.nil(), owntype.tsym, 3745 owntype.getMetadata()); 3746 } 3747 } 3748 break; 3749 case VAR: 3750 VarSymbol v = (VarSymbol)sym; 3751 // Test (4): if symbol is an instance field of a raw type, 3752 // which is being assigned to, issue an unchecked warning if 3753 // its type changes under erasure. 3754 if (KindSelector.ASG.subset(pkind()) && 3755 v.owner.kind == TYP && 3756 (v.flags() & STATIC) == 0 && 3757 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3758 Type s = types.asOuterSuper(site, v.owner); 3759 if (s != null && 3760 s.isRaw() && 3761 !types.isSameType(v.type, v.erasure(types))) { 3762 chk.warnUnchecked(tree.pos(), 3763 "unchecked.assign.to.var", 3764 v, s); 3765 } 3766 } 3767 // The computed type of a variable is the type of the 3768 // variable symbol, taken as a member of the site type. 3769 owntype = (sym.owner.kind == TYP && 3770 sym.name != names._this && sym.name != names._super) 3771 ? types.memberType(site, sym) 3772 : sym.type; 3773 3774 // If the variable is a constant, record constant value in 3775 // computed type. 3776 if (v.getConstValue() != null && isStaticReference(tree)) 3777 owntype = owntype.constType(v.getConstValue()); 3778 3779 if (resultInfo.pkind == KindSelector.VAL) { 3780 owntype = capture(owntype); // capture "names as expressions" 3781 } 3782 break; 3783 case MTH: { 3784 owntype = checkMethod(site, sym, 3785 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode), 3786 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3787 resultInfo.pt.getTypeArguments()); 3788 break; 3789 } 3790 case PCK: case ERR: 3791 owntype = sym.type; 3792 break; 3793 default: 3794 throw new AssertionError("unexpected kind: " + sym.kind + 3795 " in tree " + tree); 3796 } 3797 3798 // Emit a `deprecation' warning if symbol is deprecated. 3799 // (for constructors (but not for constructor references), the error 3800 // was given when the constructor was resolved) 3801 3802 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3803 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3804 chk.checkSunAPI(tree.pos(), sym); 3805 chk.checkProfile(tree.pos(), sym); 3806 } 3807 3808 // If symbol is a variable, check that its type and 3809 // kind are compatible with the prototype and protokind. 3810 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3811 } 3812 3813 /** Check that variable is initialized and evaluate the variable's 3814 * initializer, if not yet done. Also check that variable is not 3815 * referenced before it is defined. 3816 * @param tree The tree making up the variable reference. 3817 * @param env The current environment. 3818 * @param v The variable's symbol. 3819 */ 3820 private void checkInit(JCTree tree, 3821 Env<AttrContext> env, 3822 VarSymbol v, 3823 boolean onlyWarning) { 3824 // A forward reference is diagnosed if the declaration position 3825 // of the variable is greater than the current tree position 3826 // and the tree and variable definition occur in the same class 3827 // definition. Note that writes don't count as references. 3828 // This check applies only to class and instance 3829 // variables. Local variables follow different scope rules, 3830 // and are subject to definite assignment checking. 3831 Env<AttrContext> initEnv = enclosingInitEnv(env); 3832 if (initEnv != null && 3833 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3834 v.owner.kind == TYP && 3835 v.owner == env.info.scope.owner.enclClass() && 3836 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3837 (!env.tree.hasTag(ASSIGN) || 3838 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3839 String suffix = (initEnv.info.enclVar == v) ? 3840 "self.ref" : "forward.ref"; 3841 if (!onlyWarning || isStaticEnumField(v)) { 3842 log.error(tree.pos(), "illegal." + suffix); 3843 } else if (useBeforeDeclarationWarning) { 3844 log.warning(tree.pos(), suffix, v); 3845 } 3846 } 3847 3848 v.getConstValue(); // ensure initializer is evaluated 3849 3850 checkEnumInitializer(tree, env, v); 3851 } 3852 3853 /** 3854 * Returns the enclosing init environment associated with this env (if any). An init env 3855 * can be either a field declaration env or a static/instance initializer env. 3856 */ 3857 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3858 while (true) { 3859 switch (env.tree.getTag()) { 3860 case VARDEF: 3861 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3862 if (vdecl.sym.owner.kind == TYP) { 3863 //field 3864 return env; 3865 } 3866 break; 3867 case BLOCK: 3868 if (env.next.tree.hasTag(CLASSDEF)) { 3869 //instance/static initializer 3870 return env; 3871 } 3872 break; 3873 case METHODDEF: 3874 case CLASSDEF: 3875 case TOPLEVEL: 3876 return null; 3877 } 3878 Assert.checkNonNull(env.next); 3879 env = env.next; 3880 } 3881 } 3882 3883 /** 3884 * Check for illegal references to static members of enum. In 3885 * an enum type, constructors and initializers may not 3886 * reference its static members unless they are constant. 3887 * 3888 * @param tree The tree making up the variable reference. 3889 * @param env The current environment. 3890 * @param v The variable's symbol. 3891 * @jls section 8.9 Enums 3892 */ 3893 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3894 // JLS: 3895 // 3896 // "It is a compile-time error to reference a static field 3897 // of an enum type that is not a compile-time constant 3898 // (15.28) from constructors, instance initializer blocks, 3899 // or instance variable initializer expressions of that 3900 // type. It is a compile-time error for the constructors, 3901 // instance initializer blocks, or instance variable 3902 // initializer expressions of an enum constant e to refer 3903 // to itself or to an enum constant of the same type that 3904 // is declared to the right of e." 3905 if (isStaticEnumField(v)) { 3906 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3907 3908 if (enclClass == null || enclClass.owner == null) 3909 return; 3910 3911 // See if the enclosing class is the enum (or a 3912 // subclass thereof) declaring v. If not, this 3913 // reference is OK. 3914 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3915 return; 3916 3917 // If the reference isn't from an initializer, then 3918 // the reference is OK. 3919 if (!Resolve.isInitializer(env)) 3920 return; 3921 3922 log.error(tree.pos(), "illegal.enum.static.ref"); 3923 } 3924 } 3925 3926 /** Is the given symbol a static, non-constant field of an Enum? 3927 * Note: enum literals should not be regarded as such 3928 */ 3929 private boolean isStaticEnumField(VarSymbol v) { 3930 return Flags.isEnum(v.owner) && 3931 Flags.isStatic(v) && 3932 !Flags.isConstant(v) && 3933 v.name != names._class; 3934 } 3935 3936 /** 3937 * Check that method arguments conform to its instantiation. 3938 **/ 3939 public Type checkMethod(Type site, 3940 final Symbol sym, 3941 ResultInfo resultInfo, 3942 Env<AttrContext> env, 3943 final List<JCExpression> argtrees, 3944 List<Type> argtypes, 3945 List<Type> typeargtypes) { 3946 // Test (5): if symbol is an instance method of a raw type, issue 3947 // an unchecked warning if its argument types change under erasure. 3948 if ((sym.flags() & STATIC) == 0 && 3949 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3950 Type s = types.asOuterSuper(site, sym.owner); 3951 if (s != null && s.isRaw() && 3952 !types.isSameTypes(sym.type.getParameterTypes(), 3953 sym.erasure(types).getParameterTypes())) { 3954 chk.warnUnchecked(env.tree.pos(), 3955 "unchecked.call.mbr.of.raw.type", 3956 sym, s); 3957 } 3958 } 3959 3960 if (env.info.defaultSuperCallSite != null) { 3961 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3962 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3963 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3964 List<MethodSymbol> icand_sup = 3965 types.interfaceCandidates(sup, (MethodSymbol)sym); 3966 if (icand_sup.nonEmpty() && 3967 icand_sup.head != sym && 3968 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3969 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3970 diags.fragment("overridden.default", sym, sup)); 3971 break; 3972 } 3973 } 3974 env.info.defaultSuperCallSite = null; 3975 } 3976 3977 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3978 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3979 if (app.meth.hasTag(SELECT) && 3980 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3981 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3982 } 3983 } 3984 3985 // Compute the identifier's instantiated type. 3986 // For methods, we need to compute the instance type by 3987 // Resolve.instantiate from the symbol's type as well as 3988 // any type arguments and value arguments. 3989 Warner noteWarner = new Warner(); 3990 try { 3991 Type owntype = rs.checkMethod( 3992 env, 3993 site, 3994 sym, 3995 resultInfo, 3996 argtypes, 3997 typeargtypes, 3998 noteWarner); 3999 4000 DeferredAttr.DeferredTypeMap checkDeferredMap = 4001 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 4002 4003 argtypes = argtypes.map(checkDeferredMap); 4004 4005 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 4006 chk.warnUnchecked(env.tree.pos(), 4007 "unchecked.meth.invocation.applied", 4008 kindName(sym), 4009 sym.name, 4010 rs.methodArguments(sym.type.getParameterTypes()), 4011 rs.methodArguments(argtypes.map(checkDeferredMap)), 4012 kindName(sym.location()), 4013 sym.location()); 4014 if (resultInfo.pt != Infer.anyPoly || 4015 !owntype.hasTag(METHOD) || 4016 !owntype.isPartial()) { 4017 //if this is not a partially inferred method type, erase return type. Otherwise, 4018 //erasure is carried out in PartiallyInferredMethodType.check(). 4019 owntype = new MethodType(owntype.getParameterTypes(), 4020 types.erasure(owntype.getReturnType()), 4021 types.erasure(owntype.getThrownTypes()), 4022 syms.methodClass); 4023 } 4024 } 4025 4026 PolyKind pkind = (sym.type.hasTag(FORALL) && 4027 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 4028 PolyKind.POLY : PolyKind.STANDALONE; 4029 TreeInfo.setPolyKind(env.tree, pkind); 4030 4031 return (resultInfo.pt == Infer.anyPoly) ? 4032 owntype : 4033 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4034 resultInfo.checkContext.inferenceContext()); 4035 } catch (Infer.InferenceException ex) { 4036 //invalid target type - propagate exception outwards or report error 4037 //depending on the current check context 4038 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 4039 return types.createErrorType(site); 4040 } catch (Resolve.InapplicableMethodException ex) { 4041 final JCDiagnostic diag = ex.getDiagnostic(); 4042 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 4043 @Override 4044 protected Pair<Symbol, JCDiagnostic> errCandidate() { 4045 return new Pair<>(sym, diag); 4046 } 4047 }; 4048 List<Type> argtypes2 = argtypes.map( 4049 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4050 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 4051 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 4052 log.report(errDiag); 4053 return types.createErrorType(site); 4054 } 4055 } 4056 4057 public void visitLiteral(JCLiteral tree) { 4058 result = check(tree, litType(tree.typetag).constType(tree.value), 4059 KindSelector.VAL, resultInfo); 4060 } 4061 //where 4062 /** Return the type of a literal with given type tag. 4063 */ 4064 Type litType(TypeTag tag) { 4065 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4066 } 4067 4068 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4069 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4070 } 4071 4072 public void visitTypeArray(JCArrayTypeTree tree) { 4073 Type etype = attribType(tree.elemtype, env); 4074 Type type = new ArrayType(etype, syms.arrayClass); 4075 result = check(tree, type, KindSelector.TYP, resultInfo); 4076 } 4077 4078 /** Visitor method for parameterized types. 4079 * Bound checking is left until later, since types are attributed 4080 * before supertype structure is completely known 4081 */ 4082 public void visitTypeApply(JCTypeApply tree) { 4083 Type owntype = types.createErrorType(tree.type); 4084 4085 // Attribute functor part of application and make sure it's a class. 4086 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4087 4088 // Attribute type parameters 4089 List<Type> actuals = attribTypes(tree.arguments, env); 4090 4091 if (clazztype.hasTag(CLASS)) { 4092 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4093 if (actuals.isEmpty()) //diamond 4094 actuals = formals; 4095 4096 if (actuals.length() == formals.length()) { 4097 List<Type> a = actuals; 4098 List<Type> f = formals; 4099 while (a.nonEmpty()) { 4100 a.head = a.head.withTypeVar(f.head); 4101 a = a.tail; 4102 f = f.tail; 4103 } 4104 // Compute the proper generic outer 4105 Type clazzOuter = clazztype.getEnclosingType(); 4106 if (clazzOuter.hasTag(CLASS)) { 4107 Type site; 4108 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4109 if (clazz.hasTag(IDENT)) { 4110 site = env.enclClass.sym.type; 4111 } else if (clazz.hasTag(SELECT)) { 4112 site = ((JCFieldAccess) clazz).selected.type; 4113 } else throw new AssertionError(""+tree); 4114 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4115 if (site.hasTag(CLASS)) 4116 site = types.asOuterSuper(site, clazzOuter.tsym); 4117 if (site == null) 4118 site = types.erasure(clazzOuter); 4119 clazzOuter = site; 4120 } 4121 } 4122 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4123 clazztype.getMetadata()); 4124 } else { 4125 if (formals.length() != 0) { 4126 log.error(tree.pos(), "wrong.number.type.args", 4127 Integer.toString(formals.length())); 4128 } else { 4129 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4130 } 4131 owntype = types.createErrorType(tree.type); 4132 } 4133 } 4134 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4135 } 4136 4137 public void visitTypeUnion(JCTypeUnion tree) { 4138 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4139 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4140 for (JCExpression typeTree : tree.alternatives) { 4141 Type ctype = attribType(typeTree, env); 4142 ctype = chk.checkType(typeTree.pos(), 4143 chk.checkClassType(typeTree.pos(), ctype), 4144 syms.throwableType); 4145 if (!ctype.isErroneous()) { 4146 //check that alternatives of a union type are pairwise 4147 //unrelated w.r.t. subtyping 4148 if (chk.intersects(ctype, multicatchTypes.toList())) { 4149 for (Type t : multicatchTypes) { 4150 boolean sub = types.isSubtype(ctype, t); 4151 boolean sup = types.isSubtype(t, ctype); 4152 if (sub || sup) { 4153 //assume 'a' <: 'b' 4154 Type a = sub ? ctype : t; 4155 Type b = sub ? t : ctype; 4156 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4157 } 4158 } 4159 } 4160 multicatchTypes.append(ctype); 4161 if (all_multicatchTypes != null) 4162 all_multicatchTypes.append(ctype); 4163 } else { 4164 if (all_multicatchTypes == null) { 4165 all_multicatchTypes = new ListBuffer<>(); 4166 all_multicatchTypes.appendList(multicatchTypes); 4167 } 4168 all_multicatchTypes.append(ctype); 4169 } 4170 } 4171 Type t = check(tree, types.lub(multicatchTypes.toList()), 4172 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4173 if (t.hasTag(CLASS)) { 4174 List<Type> alternatives = 4175 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4176 t = new UnionClassType((ClassType) t, alternatives); 4177 } 4178 tree.type = result = t; 4179 } 4180 4181 public void visitTypeIntersection(JCTypeIntersection tree) { 4182 attribTypes(tree.bounds, env); 4183 tree.type = result = checkIntersection(tree, tree.bounds); 4184 } 4185 4186 public void visitTypeParameter(JCTypeParameter tree) { 4187 TypeVar typeVar = (TypeVar) tree.type; 4188 4189 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4190 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4191 } 4192 4193 if (!typeVar.bound.isErroneous()) { 4194 //fixup type-parameter bound computed in 'attribTypeVariables' 4195 typeVar.bound = checkIntersection(tree, tree.bounds); 4196 } 4197 } 4198 4199 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4200 Set<Type> boundSet = new HashSet<>(); 4201 if (bounds.nonEmpty()) { 4202 // accept class or interface or typevar as first bound. 4203 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4204 boundSet.add(types.erasure(bounds.head.type)); 4205 if (bounds.head.type.isErroneous()) { 4206 return bounds.head.type; 4207 } 4208 else if (bounds.head.type.hasTag(TYPEVAR)) { 4209 // if first bound was a typevar, do not accept further bounds. 4210 if (bounds.tail.nonEmpty()) { 4211 log.error(bounds.tail.head.pos(), 4212 "type.var.may.not.be.followed.by.other.bounds"); 4213 return bounds.head.type; 4214 } 4215 } else { 4216 // if first bound was a class or interface, accept only interfaces 4217 // as further bounds. 4218 for (JCExpression bound : bounds.tail) { 4219 bound.type = checkBase(bound.type, bound, env, false, true, false); 4220 if (bound.type.isErroneous()) { 4221 bounds = List.of(bound); 4222 } 4223 else if (bound.type.hasTag(CLASS)) { 4224 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4225 } 4226 } 4227 } 4228 } 4229 4230 if (bounds.length() == 0) { 4231 return syms.objectType; 4232 } else if (bounds.length() == 1) { 4233 return bounds.head.type; 4234 } else { 4235 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4236 // ... the variable's bound is a class type flagged COMPOUND 4237 // (see comment for TypeVar.bound). 4238 // In this case, generate a class tree that represents the 4239 // bound class, ... 4240 JCExpression extending; 4241 List<JCExpression> implementing; 4242 if (!bounds.head.type.isInterface()) { 4243 extending = bounds.head; 4244 implementing = bounds.tail; 4245 } else { 4246 extending = null; 4247 implementing = bounds; 4248 } 4249 JCClassDecl cd = make.at(tree).ClassDef( 4250 make.Modifiers(PUBLIC | ABSTRACT), 4251 names.empty, List.nil(), 4252 extending, implementing, List.nil()); 4253 4254 ClassSymbol c = (ClassSymbol)owntype.tsym; 4255 Assert.check((c.flags() & COMPOUND) != 0); 4256 cd.sym = c; 4257 c.sourcefile = env.toplevel.sourcefile; 4258 4259 // ... and attribute the bound class 4260 c.flags_field |= UNATTRIBUTED; 4261 Env<AttrContext> cenv = enter.classEnv(cd, env); 4262 typeEnvs.put(c, cenv); 4263 attribClass(c); 4264 return owntype; 4265 } 4266 } 4267 4268 public void visitWildcard(JCWildcard tree) { 4269 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4270 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4271 ? syms.objectType 4272 : attribType(tree.inner, env); 4273 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4274 tree.kind.kind, 4275 syms.boundClass), 4276 KindSelector.TYP, resultInfo); 4277 } 4278 4279 public void visitAnnotation(JCAnnotation tree) { 4280 Assert.error("should be handled in annotate"); 4281 } 4282 4283 public void visitAnnotatedType(JCAnnotatedType tree) { 4284 attribAnnotationTypes(tree.annotations, env); 4285 Type underlyingType = attribType(tree.underlyingType, env); 4286 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4287 4288 if (!env.info.isNewClass) 4289 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4290 result = tree.type = annotatedType; 4291 } 4292 4293 public void visitErroneous(JCErroneous tree) { 4294 if (tree.errs != null) 4295 for (JCTree err : tree.errs) 4296 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4297 result = tree.type = syms.errType; 4298 } 4299 4300 /** Default visitor method for all other trees. 4301 */ 4302 public void visitTree(JCTree tree) { 4303 throw new AssertionError(); 4304 } 4305 4306 /** 4307 * Attribute an env for either a top level tree or class or module declaration. 4308 */ 4309 public void attrib(Env<AttrContext> env) { 4310 switch (env.tree.getTag()) { 4311 case MODULEDEF: 4312 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4313 break; 4314 case TOPLEVEL: 4315 attribTopLevel(env); 4316 break; 4317 case PACKAGEDEF: 4318 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge); 4319 break; 4320 default: 4321 attribClass(env.tree.pos(), env.enclClass.sym); 4322 } 4323 } 4324 4325 /** 4326 * Attribute a top level tree. These trees are encountered when the 4327 * package declaration has annotations. 4328 */ 4329 public void attribTopLevel(Env<AttrContext> env) { 4330 JCCompilationUnit toplevel = env.toplevel; 4331 try { 4332 annotate.flush(); 4333 } catch (CompletionFailure ex) { 4334 chk.completionError(toplevel.pos(), ex); 4335 } 4336 } 4337 4338 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) { 4339 try { 4340 annotate.flush(); 4341 attribPackage(p); 4342 } catch (CompletionFailure ex) { 4343 chk.completionError(pos, ex); 4344 } 4345 } 4346 4347 void attribPackage(PackageSymbol p) { 4348 Env<AttrContext> env = typeEnvs.get(p); 4349 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p); 4350 } 4351 4352 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4353 try { 4354 annotate.flush(); 4355 attribModule(m); 4356 } catch (CompletionFailure ex) { 4357 chk.completionError(pos, ex); 4358 } 4359 } 4360 4361 void attribModule(ModuleSymbol m) { 4362 // Get environment current at the point of module definition. 4363 Env<AttrContext> env = enter.typeEnvs.get(m); 4364 attribStat(env.tree, env); 4365 } 4366 4367 /** Main method: attribute class definition associated with given class symbol. 4368 * reporting completion failures at the given position. 4369 * @param pos The source position at which completion errors are to be 4370 * reported. 4371 * @param c The class symbol whose definition will be attributed. 4372 */ 4373 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4374 try { 4375 annotate.flush(); 4376 attribClass(c); 4377 } catch (CompletionFailure ex) { 4378 chk.completionError(pos, ex); 4379 } 4380 } 4381 4382 /** Attribute class definition associated with given class symbol. 4383 * @param c The class symbol whose definition will be attributed. 4384 */ 4385 void attribClass(ClassSymbol c) throws CompletionFailure { 4386 if (c.type.hasTag(ERROR)) return; 4387 4388 // Check for cycles in the inheritance graph, which can arise from 4389 // ill-formed class files. 4390 chk.checkNonCyclic(null, c.type); 4391 4392 Type st = types.supertype(c.type); 4393 if ((c.flags_field & Flags.COMPOUND) == 0) { 4394 // First, attribute superclass. 4395 if (st.hasTag(CLASS)) 4396 attribClass((ClassSymbol)st.tsym); 4397 4398 // Next attribute owner, if it is a class. 4399 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4400 attribClass((ClassSymbol)c.owner); 4401 } 4402 4403 // The previous operations might have attributed the current class 4404 // if there was a cycle. So we test first whether the class is still 4405 // UNATTRIBUTED. 4406 if ((c.flags_field & UNATTRIBUTED) != 0) { 4407 c.flags_field &= ~UNATTRIBUTED; 4408 4409 // Get environment current at the point of class definition. 4410 Env<AttrContext> env = typeEnvs.get(c); 4411 4412 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4413 // because the annotations were not available at the time the env was created. Therefore, 4414 // we look up the environment chain for the first enclosing environment for which the 4415 // lint value is set. Typically, this is the parent env, but might be further if there 4416 // are any envs created as a result of TypeParameter nodes. 4417 Env<AttrContext> lintEnv = env; 4418 while (lintEnv.info.lint == null) 4419 lintEnv = lintEnv.next; 4420 4421 // Having found the enclosing lint value, we can initialize the lint value for this class 4422 env.info.lint = lintEnv.info.lint.augment(c); 4423 4424 Lint prevLint = chk.setLint(env.info.lint); 4425 JavaFileObject prev = log.useSource(c.sourcefile); 4426 ResultInfo prevReturnRes = env.info.returnResult; 4427 4428 try { 4429 deferredLintHandler.flush(env.tree); 4430 env.info.returnResult = null; 4431 // java.lang.Enum may not be subclassed by a non-enum 4432 if (st.tsym == syms.enumSym && 4433 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4434 log.error(env.tree.pos(), "enum.no.subclassing"); 4435 4436 // Enums may not be extended by source-level classes 4437 if (st.tsym != null && 4438 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4439 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4440 log.error(env.tree.pos(), "enum.types.not.extensible"); 4441 } 4442 4443 if (isSerializable(c.type)) { 4444 env.info.isSerializable = true; 4445 } 4446 4447 attribClassBody(env, c); 4448 4449 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4450 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4451 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4452 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree); 4453 } finally { 4454 env.info.returnResult = prevReturnRes; 4455 log.useSource(prev); 4456 chk.setLint(prevLint); 4457 } 4458 4459 } 4460 } 4461 4462 public void visitImport(JCImport tree) { 4463 // nothing to do 4464 } 4465 4466 public void visitModuleDef(JCModuleDecl tree) { 4467 tree.sym.completeUsesProvides(); 4468 ModuleSymbol msym = tree.sym; 4469 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym); 4470 Lint prevLint = chk.setLint(lint); 4471 chk.checkModuleName(tree); 4472 chk.checkDeprecatedAnnotation(tree, msym); 4473 4474 try { 4475 deferredLintHandler.flush(tree.pos()); 4476 } finally { 4477 chk.setLint(prevLint); 4478 } 4479 } 4480 4481 /** Finish the attribution of a class. */ 4482 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4483 JCClassDecl tree = (JCClassDecl)env.tree; 4484 Assert.check(c == tree.sym); 4485 4486 // Validate type parameters, supertype and interfaces. 4487 attribStats(tree.typarams, env); 4488 if (!c.isAnonymous()) { 4489 //already checked if anonymous 4490 chk.validate(tree.typarams, env); 4491 chk.validate(tree.extending, env); 4492 chk.validate(tree.implementing, env); 4493 } 4494 4495 c.markAbstractIfNeeded(types); 4496 4497 // If this is a non-abstract class, check that it has no abstract 4498 // methods or unimplemented methods of an implemented interface. 4499 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4500 chk.checkAllDefined(tree.pos(), c); 4501 } 4502 4503 if ((c.flags() & ANNOTATION) != 0) { 4504 if (tree.implementing.nonEmpty()) 4505 log.error(tree.implementing.head.pos(), 4506 "cant.extend.intf.annotation"); 4507 if (tree.typarams.nonEmpty()) 4508 log.error(tree.typarams.head.pos(), 4509 "intf.annotation.cant.have.type.params"); 4510 4511 // If this annotation type has a @Repeatable, validate 4512 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4513 // If this annotation type has a @Repeatable, validate 4514 if (repeatable != null) { 4515 // get diagnostic position for error reporting 4516 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4517 Assert.checkNonNull(cbPos); 4518 4519 chk.validateRepeatable(c, repeatable, cbPos); 4520 } 4521 } else { 4522 // Check that all extended classes and interfaces 4523 // are compatible (i.e. no two define methods with same arguments 4524 // yet different return types). (JLS 8.4.6.3) 4525 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4526 if (allowDefaultMethods) { 4527 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4528 } 4529 } 4530 4531 // Check that class does not import the same parameterized interface 4532 // with two different argument lists. 4533 chk.checkClassBounds(tree.pos(), c.type); 4534 4535 tree.type = c.type; 4536 4537 for (List<JCTypeParameter> l = tree.typarams; 4538 l.nonEmpty(); l = l.tail) { 4539 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4540 } 4541 4542 // Check that a generic class doesn't extend Throwable 4543 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4544 log.error(tree.extending.pos(), "generic.throwable"); 4545 4546 // Check that all methods which implement some 4547 // method conform to the method they implement. 4548 chk.checkImplementations(tree); 4549 4550 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4551 checkAutoCloseable(tree.pos(), env, c.type); 4552 4553 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4554 // Attribute declaration 4555 attribStat(l.head, env); 4556 // Check that declarations in inner classes are not static (JLS 8.1.2) 4557 // Make an exception for static constants. 4558 if (c.owner.kind != PCK && 4559 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4560 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4561 Symbol sym = null; 4562 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4563 if (sym == null || 4564 sym.kind != VAR || 4565 ((VarSymbol) sym).getConstValue() == null) 4566 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4567 } 4568 } 4569 4570 // Check for cycles among non-initial constructors. 4571 chk.checkCyclicConstructors(tree); 4572 4573 // Check for cycles among annotation elements. 4574 chk.checkNonCyclicElements(tree); 4575 4576 // Check for proper use of serialVersionUID 4577 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4578 && isSerializable(c.type) 4579 && (c.flags() & Flags.ENUM) == 0 4580 && !c.isAnonymous() 4581 && checkForSerial(c)) { 4582 checkSerialVersionUID(tree, c); 4583 } 4584 if (allowTypeAnnos) { 4585 // Correctly organize the postions of the type annotations 4586 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4587 4588 // Check type annotations applicability rules 4589 validateTypeAnnotations(tree, false); 4590 } 4591 } 4592 // where 4593 boolean checkForSerial(ClassSymbol c) { 4594 if ((c.flags() & ABSTRACT) == 0) { 4595 return true; 4596 } else { 4597 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4598 } 4599 } 4600 4601 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = s -> 4602 s.kind == MTH && (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4603 4604 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4605 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4606 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4607 if (types.isSameType(al.head.annotationType.type, t)) 4608 return al.head.pos(); 4609 } 4610 4611 return null; 4612 } 4613 4614 /** check if a type is a subtype of Serializable, if that is available. */ 4615 boolean isSerializable(Type t) { 4616 try { 4617 syms.serializableType.complete(); 4618 } 4619 catch (CompletionFailure e) { 4620 return false; 4621 } 4622 return types.isSubtype(t, syms.serializableType); 4623 } 4624 4625 /** Check that an appropriate serialVersionUID member is defined. */ 4626 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4627 4628 // check for presence of serialVersionUID 4629 VarSymbol svuid = null; 4630 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4631 if (sym.kind == VAR) { 4632 svuid = (VarSymbol)sym; 4633 break; 4634 } 4635 } 4636 4637 if (svuid == null) { 4638 log.warning(LintCategory.SERIAL, 4639 tree.pos(), "missing.SVUID", c); 4640 return; 4641 } 4642 4643 // check that it is static final 4644 if ((svuid.flags() & (STATIC | FINAL)) != 4645 (STATIC | FINAL)) 4646 log.warning(LintCategory.SERIAL, 4647 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4648 4649 // check that it is long 4650 else if (!svuid.type.hasTag(LONG)) 4651 log.warning(LintCategory.SERIAL, 4652 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4653 4654 // check constant 4655 else if (svuid.getConstValue() == null) 4656 log.warning(LintCategory.SERIAL, 4657 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4658 } 4659 4660 private Type capture(Type type) { 4661 return types.capture(type); 4662 } 4663 4664 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4665 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4666 } 4667 //where 4668 private final class TypeAnnotationsValidator extends TreeScanner { 4669 4670 private final boolean sigOnly; 4671 public TypeAnnotationsValidator(boolean sigOnly) { 4672 this.sigOnly = sigOnly; 4673 } 4674 4675 public void visitAnnotation(JCAnnotation tree) { 4676 chk.validateTypeAnnotation(tree, false); 4677 super.visitAnnotation(tree); 4678 } 4679 public void visitAnnotatedType(JCAnnotatedType tree) { 4680 if (!tree.underlyingType.type.isErroneous()) { 4681 super.visitAnnotatedType(tree); 4682 } 4683 } 4684 public void visitTypeParameter(JCTypeParameter tree) { 4685 chk.validateTypeAnnotations(tree.annotations, true); 4686 scan(tree.bounds); 4687 // Don't call super. 4688 // This is needed because above we call validateTypeAnnotation with 4689 // false, which would forbid annotations on type parameters. 4690 // super.visitTypeParameter(tree); 4691 } 4692 public void visitMethodDef(JCMethodDecl tree) { 4693 if (tree.recvparam != null && 4694 !tree.recvparam.vartype.type.isErroneous()) { 4695 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4696 tree.recvparam.vartype.type.tsym); 4697 } 4698 if (tree.restype != null && tree.restype.type != null) { 4699 validateAnnotatedType(tree.restype, tree.restype.type); 4700 } 4701 if (sigOnly) { 4702 scan(tree.mods); 4703 scan(tree.restype); 4704 scan(tree.typarams); 4705 scan(tree.recvparam); 4706 scan(tree.params); 4707 scan(tree.thrown); 4708 } else { 4709 scan(tree.defaultValue); 4710 scan(tree.body); 4711 } 4712 } 4713 public void visitVarDef(final JCVariableDecl tree) { 4714 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4715 if (tree.sym != null && tree.sym.type != null) 4716 validateAnnotatedType(tree.vartype, tree.sym.type); 4717 scan(tree.mods); 4718 scan(tree.vartype); 4719 if (!sigOnly) { 4720 scan(tree.init); 4721 } 4722 } 4723 public void visitTypeCast(JCTypeCast tree) { 4724 if (tree.clazz != null && tree.clazz.type != null) 4725 validateAnnotatedType(tree.clazz, tree.clazz.type); 4726 super.visitTypeCast(tree); 4727 } 4728 public void visitTypeTest(JCInstanceOf tree) { 4729 if (tree.clazz != null && tree.clazz.type != null) 4730 validateAnnotatedType(tree.clazz, tree.clazz.type); 4731 super.visitTypeTest(tree); 4732 } 4733 public void visitNewClass(JCNewClass tree) { 4734 if (tree.clazz != null && tree.clazz.type != null) { 4735 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4736 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4737 tree.clazz.type.tsym); 4738 } 4739 if (tree.def != null) { 4740 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4741 } 4742 4743 validateAnnotatedType(tree.clazz, tree.clazz.type); 4744 } 4745 super.visitNewClass(tree); 4746 } 4747 public void visitNewArray(JCNewArray tree) { 4748 if (tree.elemtype != null && tree.elemtype.type != null) { 4749 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4750 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4751 tree.elemtype.type.tsym); 4752 } 4753 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4754 } 4755 super.visitNewArray(tree); 4756 } 4757 public void visitClassDef(JCClassDecl tree) { 4758 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4759 if (sigOnly) { 4760 scan(tree.mods); 4761 scan(tree.typarams); 4762 scan(tree.extending); 4763 scan(tree.implementing); 4764 } 4765 for (JCTree member : tree.defs) { 4766 if (member.hasTag(Tag.CLASSDEF)) { 4767 continue; 4768 } 4769 scan(member); 4770 } 4771 } 4772 public void visitBlock(JCBlock tree) { 4773 if (!sigOnly) { 4774 scan(tree.stats); 4775 } 4776 } 4777 4778 /* I would want to model this after 4779 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4780 * and override visitSelect and visitTypeApply. 4781 * However, we only set the annotated type in the top-level type 4782 * of the symbol. 4783 * Therefore, we need to override each individual location where a type 4784 * can occur. 4785 */ 4786 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4787 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4788 4789 if (type.isPrimitiveOrVoid()) { 4790 return; 4791 } 4792 4793 JCTree enclTr = errtree; 4794 Type enclTy = type; 4795 4796 boolean repeat = true; 4797 while (repeat) { 4798 if (enclTr.hasTag(TYPEAPPLY)) { 4799 List<Type> tyargs = enclTy.getTypeArguments(); 4800 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4801 if (trargs.length() > 0) { 4802 // Nothing to do for diamonds 4803 if (tyargs.length() == trargs.length()) { 4804 for (int i = 0; i < tyargs.length(); ++i) { 4805 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4806 } 4807 } 4808 // If the lengths don't match, it's either a diamond 4809 // or some nested type that redundantly provides 4810 // type arguments in the tree. 4811 } 4812 4813 // Look at the clazz part of a generic type 4814 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4815 } 4816 4817 if (enclTr.hasTag(SELECT)) { 4818 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4819 if (enclTy != null && 4820 !enclTy.hasTag(NONE)) { 4821 enclTy = enclTy.getEnclosingType(); 4822 } 4823 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4824 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4825 if (enclTy == null || enclTy.hasTag(NONE)) { 4826 if (at.getAnnotations().size() == 1) { 4827 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4828 } else { 4829 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4830 for (JCAnnotation an : at.getAnnotations()) { 4831 comps.add(an.attribute); 4832 } 4833 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4834 } 4835 repeat = false; 4836 } 4837 enclTr = at.underlyingType; 4838 // enclTy doesn't need to be changed 4839 } else if (enclTr.hasTag(IDENT)) { 4840 repeat = false; 4841 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4842 JCWildcard wc = (JCWildcard) enclTr; 4843 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4844 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4845 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4846 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4847 } else { 4848 // Nothing to do for UNBOUND 4849 } 4850 repeat = false; 4851 } else if (enclTr.hasTag(TYPEARRAY)) { 4852 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4853 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4854 repeat = false; 4855 } else if (enclTr.hasTag(TYPEUNION)) { 4856 JCTypeUnion ut = (JCTypeUnion) enclTr; 4857 for (JCTree t : ut.getTypeAlternatives()) { 4858 validateAnnotatedType(t, t.type); 4859 } 4860 repeat = false; 4861 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4862 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4863 for (JCTree t : it.getBounds()) { 4864 validateAnnotatedType(t, t.type); 4865 } 4866 repeat = false; 4867 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4868 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4869 repeat = false; 4870 } else { 4871 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4872 " within: "+ errtree + " with kind: " + errtree.getKind()); 4873 } 4874 } 4875 } 4876 4877 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4878 Symbol sym) { 4879 // Ensure that no declaration annotations are present. 4880 // Note that a tree type might be an AnnotatedType with 4881 // empty annotations, if only declaration annotations were given. 4882 // This method will raise an error for such a type. 4883 for (JCAnnotation ai : annotations) { 4884 if (!ai.type.isErroneous() && 4885 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4886 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4887 } 4888 } 4889 } 4890 } 4891 4892 // <editor-fold desc="post-attribution visitor"> 4893 4894 /** 4895 * Handle missing types/symbols in an AST. This routine is useful when 4896 * the compiler has encountered some errors (which might have ended up 4897 * terminating attribution abruptly); if the compiler is used in fail-over 4898 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4899 * prevents NPE to be progagated during subsequent compilation steps. 4900 */ 4901 public void postAttr(JCTree tree) { 4902 new PostAttrAnalyzer().scan(tree); 4903 } 4904 4905 class PostAttrAnalyzer extends TreeScanner { 4906 4907 private void initTypeIfNeeded(JCTree that) { 4908 if (that.type == null) { 4909 if (that.hasTag(METHODDEF)) { 4910 that.type = dummyMethodType((JCMethodDecl)that); 4911 } else { 4912 that.type = syms.unknownType; 4913 } 4914 } 4915 } 4916 4917 /* Construct a dummy method type. If we have a method declaration, 4918 * and the declared return type is void, then use that return type 4919 * instead of UNKNOWN to avoid spurious error messages in lambda 4920 * bodies (see:JDK-8041704). 4921 */ 4922 private Type dummyMethodType(JCMethodDecl md) { 4923 Type restype = syms.unknownType; 4924 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4925 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4926 if (prim.typetag == VOID) 4927 restype = syms.voidType; 4928 } 4929 return new MethodType(List.nil(), restype, 4930 List.nil(), syms.methodClass); 4931 } 4932 private Type dummyMethodType() { 4933 return dummyMethodType(null); 4934 } 4935 4936 @Override 4937 public void scan(JCTree tree) { 4938 if (tree == null) return; 4939 if (tree instanceof JCExpression) { 4940 initTypeIfNeeded(tree); 4941 } 4942 super.scan(tree); 4943 } 4944 4945 @Override 4946 public void visitIdent(JCIdent that) { 4947 if (that.sym == null) { 4948 that.sym = syms.unknownSymbol; 4949 } 4950 } 4951 4952 @Override 4953 public void visitSelect(JCFieldAccess that) { 4954 if (that.sym == null) { 4955 that.sym = syms.unknownSymbol; 4956 } 4957 super.visitSelect(that); 4958 } 4959 4960 @Override 4961 public void visitClassDef(JCClassDecl that) { 4962 initTypeIfNeeded(that); 4963 if (that.sym == null) { 4964 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4965 } 4966 super.visitClassDef(that); 4967 } 4968 4969 @Override 4970 public void visitMethodDef(JCMethodDecl that) { 4971 initTypeIfNeeded(that); 4972 if (that.sym == null) { 4973 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4974 } 4975 super.visitMethodDef(that); 4976 } 4977 4978 @Override 4979 public void visitVarDef(JCVariableDecl that) { 4980 initTypeIfNeeded(that); 4981 if (that.sym == null) { 4982 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4983 that.sym.adr = 0; 4984 } 4985 if (that.vartype == null) { 4986 that.vartype = make.Erroneous(); 4987 } 4988 super.visitVarDef(that); 4989 } 4990 4991 @Override 4992 public void visitNewClass(JCNewClass that) { 4993 if (that.constructor == null) { 4994 that.constructor = new MethodSymbol(0, names.init, 4995 dummyMethodType(), syms.noSymbol); 4996 } 4997 if (that.constructorType == null) { 4998 that.constructorType = syms.unknownType; 4999 } 5000 super.visitNewClass(that); 5001 } 5002 5003 @Override 5004 public void visitAssignop(JCAssignOp that) { 5005 if (that.operator == null) { 5006 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5007 -1, syms.noSymbol); 5008 } 5009 super.visitAssignop(that); 5010 } 5011 5012 @Override 5013 public void visitBinary(JCBinary that) { 5014 if (that.operator == null) { 5015 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5016 -1, syms.noSymbol); 5017 } 5018 super.visitBinary(that); 5019 } 5020 5021 @Override 5022 public void visitUnary(JCUnary that) { 5023 if (that.operator == null) { 5024 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 5025 -1, syms.noSymbol); 5026 } 5027 super.visitUnary(that); 5028 } 5029 5030 @Override 5031 public void visitLambda(JCLambda that) { 5032 super.visitLambda(that); 5033 if (that.targets == null) { 5034 that.targets = List.nil(); 5035 } 5036 } 5037 5038 @Override 5039 public void visitReference(JCMemberReference that) { 5040 super.visitReference(that); 5041 if (that.sym == null) { 5042 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 5043 syms.noSymbol); 5044 } 5045 if (that.targets == null) { 5046 that.targets = List.nil(); 5047 } 5048 } 5049 } 5050 // </editor-fold> 5051 5052 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 5053 new TreeScanner() { 5054 Symbol packge = pkg; 5055 @Override 5056 public void visitIdent(JCIdent that) { 5057 that.sym = packge; 5058 } 5059 5060 @Override 5061 public void visitSelect(JCFieldAccess that) { 5062 that.sym = packge; 5063 packge = packge.owner; 5064 super.visitSelect(that); 5065 } 5066 }.scan(pid); 5067 } 5068 5069} 5070