Attr.java revision 3555:3665ebc22a42
1173589Sdelphij/* 2173589Sdelphij * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved. 3173589Sdelphij * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4173589Sdelphij * 5191930Sdelphij * This code is free software; you can redistribute it and/or modify it 6191930Sdelphij * under the terms of the GNU General Public License version 2 only, as 7191930Sdelphij * published by the Free Software Foundation. Oracle designates this 8191930Sdelphij * particular file as subject to the "Classpath" exception as provided 9191930Sdelphij * by Oracle in the LICENSE file that accompanied this code. 10191930Sdelphij * 11191930Sdelphij * This code is distributed in the hope that it will be useful, but WITHOUT 12191930Sdelphij * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13191930Sdelphij * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14191930Sdelphij * version 2 for more details (a copy is included in the LICENSE file that 15191930Sdelphij * accompanied this code). 16191930Sdelphij * 17191930Sdelphij * You should have received a copy of the GNU General Public License version 18191930Sdelphij * 2 along with this work; if not, write to the Free Software Foundation, 19173589Sdelphij * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20173589Sdelphij * 21191930Sdelphij * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22173589Sdelphij * or visit www.oracle.com if you need additional information or have any 23191930Sdelphij * questions. 24173589Sdelphij */ 25191930Sdelphij 26173589Sdelphijpackage com.sun.tools.javac.comp; 27191930Sdelphij 28import java.util.*; 29 30import javax.lang.model.element.ElementKind; 31import javax.tools.JavaFileObject; 32 33import com.sun.source.tree.IdentifierTree; 34import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 35import com.sun.source.tree.MemberSelectTree; 36import com.sun.source.tree.TreeVisitor; 37import com.sun.source.util.SimpleTreeVisitor; 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Directive.RequiresFlag; 40import com.sun.tools.javac.code.Lint.LintCategory; 41import com.sun.tools.javac.code.Scope.WriteableScope; 42import com.sun.tools.javac.code.Symbol.*; 43import com.sun.tools.javac.code.Type.*; 44import com.sun.tools.javac.code.TypeMetadata.Annotations; 45import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 46import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext; 47import com.sun.tools.javac.comp.Check.CheckContext; 48import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 49import com.sun.tools.javac.comp.Infer.FreeTypeListener; 50import com.sun.tools.javac.jvm.*; 51import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 52import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 53import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 54import com.sun.tools.javac.resources.CompilerProperties.Errors; 55import com.sun.tools.javac.resources.CompilerProperties.Fragments; 56import com.sun.tools.javac.tree.*; 57import com.sun.tools.javac.tree.JCTree.*; 58import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 59import com.sun.tools.javac.util.*; 60import com.sun.tools.javac.util.DefinedBy.Api; 61import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 62import com.sun.tools.javac.util.JCDiagnostic.Fragment; 63import com.sun.tools.javac.util.List; 64 65import static com.sun.tools.javac.code.Flags.*; 66import static com.sun.tools.javac.code.Flags.ANNOTATION; 67import static com.sun.tools.javac.code.Flags.BLOCK; 68import static com.sun.tools.javac.code.Kinds.*; 69import static com.sun.tools.javac.code.Kinds.Kind.*; 70import static com.sun.tools.javac.code.TypeTag.*; 71import static com.sun.tools.javac.code.TypeTag.WILDCARD; 72import static com.sun.tools.javac.tree.JCTree.Tag.*; 73 74/** This is the main context-dependent analysis phase in GJC. It 75 * encompasses name resolution, type checking and constant folding as 76 * subtasks. Some subtasks involve auxiliary classes. 77 * @see Check 78 * @see Resolve 79 * @see ConstFold 80 * @see Infer 81 * 82 * <p><b>This is NOT part of any supported API. 83 * If you write code that depends on this, you do so at your own risk. 84 * This code and its internal interfaces are subject to change or 85 * deletion without notice.</b> 86 */ 87public class Attr extends JCTree.Visitor { 88 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 89 90 final Names names; 91 final Log log; 92 final Symtab syms; 93 final Resolve rs; 94 final Operators operators; 95 final Infer infer; 96 final Analyzer analyzer; 97 final DeferredAttr deferredAttr; 98 final Check chk; 99 final Flow flow; 100 final MemberEnter memberEnter; 101 final TypeEnter typeEnter; 102 final TreeMaker make; 103 final ConstFold cfolder; 104 final Enter enter; 105 final Target target; 106 final Types types; 107 final JCDiagnostic.Factory diags; 108 final TypeAnnotations typeAnnotations; 109 final DeferredLintHandler deferredLintHandler; 110 final TypeEnvs typeEnvs; 111 final Dependencies dependencies; 112 final Annotate annotate; 113 final ArgumentAttr argumentAttr; 114 115 public static Attr instance(Context context) { 116 Attr instance = context.get(attrKey); 117 if (instance == null) 118 instance = new Attr(context); 119 return instance; 120 } 121 122 protected Attr(Context context) { 123 context.put(attrKey, this); 124 125 names = Names.instance(context); 126 log = Log.instance(context); 127 syms = Symtab.instance(context); 128 rs = Resolve.instance(context); 129 operators = Operators.instance(context); 130 chk = Check.instance(context); 131 flow = Flow.instance(context); 132 memberEnter = MemberEnter.instance(context); 133 typeEnter = TypeEnter.instance(context); 134 make = TreeMaker.instance(context); 135 enter = Enter.instance(context); 136 infer = Infer.instance(context); 137 analyzer = Analyzer.instance(context); 138 deferredAttr = DeferredAttr.instance(context); 139 cfolder = ConstFold.instance(context); 140 target = Target.instance(context); 141 types = Types.instance(context); 142 diags = JCDiagnostic.Factory.instance(context); 143 annotate = Annotate.instance(context); 144 typeAnnotations = TypeAnnotations.instance(context); 145 deferredLintHandler = DeferredLintHandler.instance(context); 146 typeEnvs = TypeEnvs.instance(context); 147 dependencies = Dependencies.instance(context); 148 argumentAttr = ArgumentAttr.instance(context); 149 150 Options options = Options.instance(context); 151 152 Source source = Source.instance(context); 153 allowStringsInSwitch = source.allowStringsInSwitch(); 154 allowPoly = source.allowPoly(); 155 allowTypeAnnos = source.allowTypeAnnotations(); 156 allowLambda = source.allowLambda(); 157 allowDefaultMethods = source.allowDefaultMethods(); 158 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 159 sourceName = source.name; 160 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 161 162 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 163 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 164 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 165 methodAttrInfo = new MethodAttrInfo(); 166 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 167 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 168 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 169 } 170 171 /** Switch: support target-typing inference 172 */ 173 boolean allowPoly; 174 175 /** Switch: support type annotations. 176 */ 177 boolean allowTypeAnnos; 178 179 /** Switch: support lambda expressions ? 180 */ 181 boolean allowLambda; 182 183 /** Switch: support default methods ? 184 */ 185 boolean allowDefaultMethods; 186 187 /** Switch: static interface methods enabled? 188 */ 189 boolean allowStaticInterfaceMethods; 190 191 /** 192 * Switch: warn about use of variable before declaration? 193 * RFE: 6425594 194 */ 195 boolean useBeforeDeclarationWarning; 196 197 /** 198 * Switch: allow strings in switch? 199 */ 200 boolean allowStringsInSwitch; 201 202 /** 203 * Switch: name of source level; used for error reporting. 204 */ 205 String sourceName; 206 207 /** Check kind and type of given tree against protokind and prototype. 208 * If check succeeds, store type in tree and return it. 209 * If check fails, store errType in tree and return it. 210 * No checks are performed if the prototype is a method type. 211 * It is not necessary in this case since we know that kind and type 212 * are correct. 213 * 214 * @param tree The tree whose kind and type is checked 215 * @param found The computed type of the tree 216 * @param ownkind The computed kind of the tree 217 * @param resultInfo The expected result of the tree 218 */ 219 Type check(final JCTree tree, 220 final Type found, 221 final KindSelector ownkind, 222 final ResultInfo resultInfo) { 223 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 224 Type owntype; 225 boolean shouldCheck = !found.hasTag(ERROR) && 226 !resultInfo.pt.hasTag(METHOD) && 227 !resultInfo.pt.hasTag(FORALL); 228 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 229 log.error(tree.pos(), "unexpected.type", 230 resultInfo.pkind.kindNames(), 231 ownkind.kindNames()); 232 owntype = types.createErrorType(found); 233 } else if (allowPoly && inferenceContext.free(found)) { 234 //delay the check if there are inference variables in the found type 235 //this means we are dealing with a partially inferred poly expression 236 owntype = shouldCheck ? resultInfo.pt : found; 237 if (resultInfo.checkMode.installPostInferenceHook()) { 238 inferenceContext.addFreeTypeListener(List.of(found), 239 instantiatedContext -> { 240 ResultInfo pendingResult = 241 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 242 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 243 }); 244 } 245 } else { 246 owntype = shouldCheck ? 247 resultInfo.check(tree, found) : 248 found; 249 } 250 if (resultInfo.checkMode.updateTreeType()) { 251 tree.type = owntype; 252 } 253 return owntype; 254 } 255 256 /** Is given blank final variable assignable, i.e. in a scope where it 257 * may be assigned to even though it is final? 258 * @param v The blank final variable. 259 * @param env The current environment. 260 */ 261 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 262 Symbol owner = env.info.scope.owner; 263 // owner refers to the innermost variable, method or 264 // initializer block declaration at this point. 265 return 266 v.owner == owner 267 || 268 ((owner.name == names.init || // i.e. we are in a constructor 269 owner.kind == VAR || // i.e. we are in a variable initializer 270 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 271 && 272 v.owner == owner.owner 273 && 274 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 275 } 276 277 /** Check that variable can be assigned to. 278 * @param pos The current source code position. 279 * @param v The assigned variable 280 * @param base If the variable is referred to in a Select, the part 281 * to the left of the `.', null otherwise. 282 * @param env The current environment. 283 */ 284 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 285 if (v.name == names._this) { 286 log.error(pos, Errors.CantAssignValToThis); 287 } else if ((v.flags() & FINAL) != 0 && 288 ((v.flags() & HASINIT) != 0 289 || 290 !((base == null || 291 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 292 isAssignableAsBlankFinal(v, env)))) { 293 if (v.isResourceVariable()) { //TWR resource 294 log.error(pos, "try.resource.may.not.be.assigned", v); 295 } else { 296 log.error(pos, "cant.assign.val.to.final.var", v); 297 } 298 } 299 } 300 301 /** Does tree represent a static reference to an identifier? 302 * It is assumed that tree is either a SELECT or an IDENT. 303 * We have to weed out selects from non-type names here. 304 * @param tree The candidate tree. 305 */ 306 boolean isStaticReference(JCTree tree) { 307 if (tree.hasTag(SELECT)) { 308 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 309 if (lsym == null || lsym.kind != TYP) { 310 return false; 311 } 312 } 313 return true; 314 } 315 316 /** Is this symbol a type? 317 */ 318 static boolean isType(Symbol sym) { 319 return sym != null && sym.kind == TYP; 320 } 321 322 /** The current `this' symbol. 323 * @param env The current environment. 324 */ 325 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 326 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 327 } 328 329 /** Attribute a parsed identifier. 330 * @param tree Parsed identifier name 331 * @param topLevel The toplevel to use 332 */ 333 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 334 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 335 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 336 syms.errSymbol.name, 337 null, null, null, null); 338 localEnv.enclClass.sym = syms.errSymbol; 339 return attribIdent(tree, localEnv); 340 } 341 342 /** Attribute a parsed identifier. 343 * @param tree Parsed identifier name 344 * @param env The env to use 345 */ 346 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) { 347 return tree.accept(identAttributer, env); 348 } 349 // where 350 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 351 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 352 @Override @DefinedBy(Api.COMPILER_TREE) 353 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 354 Symbol site = visit(node.getExpression(), env); 355 if (site.kind == ERR || site.kind == ABSENT_TYP) 356 return site; 357 Name name = (Name)node.getIdentifier(); 358 if (site.kind == PCK) { 359 env.toplevel.packge = (PackageSymbol)site; 360 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 361 KindSelector.TYP_PCK); 362 } else { 363 env.enclClass.sym = (ClassSymbol)site; 364 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 365 } 366 } 367 368 @Override @DefinedBy(Api.COMPILER_TREE) 369 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 370 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 371 } 372 } 373 374 public Type coerce(Type etype, Type ttype) { 375 return cfolder.coerce(etype, ttype); 376 } 377 378 public Type attribType(JCTree node, TypeSymbol sym) { 379 Env<AttrContext> env = typeEnvs.get(sym); 380 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 381 return attribTree(node, localEnv, unknownTypeInfo); 382 } 383 384 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 385 // Attribute qualifying package or class. 386 JCFieldAccess s = (JCFieldAccess)tree.qualid; 387 return attribTree(s.selected, env, 388 new ResultInfo(tree.staticImport ? 389 KindSelector.TYP : KindSelector.TYP_PCK, 390 Type.noType)); 391 } 392 393 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 394 breakTree = tree; 395 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 396 try { 397 attribExpr(expr, env); 398 } catch (BreakAttr b) { 399 return b.env; 400 } catch (AssertionError ae) { 401 if (ae.getCause() instanceof BreakAttr) { 402 return ((BreakAttr)(ae.getCause())).env; 403 } else { 404 throw ae; 405 } 406 } finally { 407 breakTree = null; 408 log.useSource(prev); 409 } 410 return env; 411 } 412 413 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 414 breakTree = tree; 415 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 416 try { 417 attribStat(stmt, env); 418 } catch (BreakAttr b) { 419 return b.env; 420 } catch (AssertionError ae) { 421 if (ae.getCause() instanceof BreakAttr) { 422 return ((BreakAttr)(ae.getCause())).env; 423 } else { 424 throw ae; 425 } 426 } finally { 427 breakTree = null; 428 log.useSource(prev); 429 } 430 return env; 431 } 432 433 private JCTree breakTree = null; 434 435 private static class BreakAttr extends RuntimeException { 436 static final long serialVersionUID = -6924771130405446405L; 437 private Env<AttrContext> env; 438 private BreakAttr(Env<AttrContext> env) { 439 this.env = env; 440 } 441 } 442 443 /** 444 * Mode controlling behavior of Attr.Check 445 */ 446 enum CheckMode { 447 448 NORMAL, 449 450 NO_TREE_UPDATE { // Mode signalling 'fake check' - skip tree update 451 @Override 452 public boolean updateTreeType() { 453 return false; 454 } 455 }, 456 NO_INFERENCE_HOOK { // Mode signalling that caller will manage free types in tree decorations. 457 @Override 458 public boolean installPostInferenceHook() { 459 return false; 460 } 461 }; 462 463 public boolean updateTreeType() { 464 return true; 465 } 466 public boolean installPostInferenceHook() { 467 return true; 468 } 469 } 470 471 472 class ResultInfo { 473 final KindSelector pkind; 474 final Type pt; 475 final CheckContext checkContext; 476 final CheckMode checkMode; 477 478 ResultInfo(KindSelector pkind, Type pt) { 479 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL); 480 } 481 482 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) { 483 this(pkind, pt, chk.basicHandler, checkMode); 484 } 485 486 protected ResultInfo(KindSelector pkind, 487 Type pt, CheckContext checkContext) { 488 this(pkind, pt, checkContext, CheckMode.NORMAL); 489 } 490 491 protected ResultInfo(KindSelector pkind, 492 Type pt, CheckContext checkContext, CheckMode checkMode) { 493 this.pkind = pkind; 494 this.pt = pt; 495 this.checkContext = checkContext; 496 this.checkMode = checkMode; 497 } 498 499 protected void attr(JCTree tree, Env<AttrContext> env) { 500 tree.accept(Attr.this); 501 } 502 503 protected Type check(final DiagnosticPosition pos, final Type found) { 504 return chk.checkType(pos, found, pt, checkContext); 505 } 506 507 protected ResultInfo dup(Type newPt) { 508 return new ResultInfo(pkind, newPt, checkContext, checkMode); 509 } 510 511 protected ResultInfo dup(CheckContext newContext) { 512 return new ResultInfo(pkind, pt, newContext, checkMode); 513 } 514 515 protected ResultInfo dup(Type newPt, CheckContext newContext) { 516 return new ResultInfo(pkind, newPt, newContext, checkMode); 517 } 518 519 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 520 return new ResultInfo(pkind, newPt, newContext, newMode); 521 } 522 523 protected ResultInfo dup(CheckMode newMode) { 524 return new ResultInfo(pkind, pt, checkContext, newMode); 525 } 526 527 @Override 528 public String toString() { 529 if (pt != null) { 530 return pt.toString(); 531 } else { 532 return ""; 533 } 534 } 535 } 536 537 class MethodAttrInfo extends ResultInfo { 538 public MethodAttrInfo() { 539 this(chk.basicHandler); 540 } 541 542 public MethodAttrInfo(CheckContext checkContext) { 543 super(KindSelector.VAL, Infer.anyPoly, checkContext); 544 } 545 546 @Override 547 protected void attr(JCTree tree, Env<AttrContext> env) { 548 result = argumentAttr.attribArg(tree, env); 549 } 550 551 protected ResultInfo dup(Type newPt) { 552 throw new IllegalStateException(); 553 } 554 555 protected ResultInfo dup(CheckContext newContext) { 556 return new MethodAttrInfo(newContext); 557 } 558 559 protected ResultInfo dup(Type newPt, CheckContext newContext) { 560 throw new IllegalStateException(); 561 } 562 563 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) { 564 throw new IllegalStateException(); 565 } 566 567 protected ResultInfo dup(CheckMode newMode) { 568 throw new IllegalStateException(); 569 } 570 } 571 572 class RecoveryInfo extends ResultInfo { 573 574 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 575 super(KindSelector.VAL, Type.recoveryType, 576 new Check.NestedCheckContext(chk.basicHandler) { 577 @Override 578 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 579 return deferredAttrContext; 580 } 581 @Override 582 public boolean compatible(Type found, Type req, Warner warn) { 583 return true; 584 } 585 @Override 586 public void report(DiagnosticPosition pos, JCDiagnostic details) { 587 chk.basicHandler.report(pos, details); 588 } 589 }); 590 } 591 } 592 593 final ResultInfo statInfo; 594 final ResultInfo varAssignmentInfo; 595 final ResultInfo methodAttrInfo; 596 final ResultInfo unknownExprInfo; 597 final ResultInfo unknownTypeInfo; 598 final ResultInfo unknownTypeExprInfo; 599 final ResultInfo recoveryInfo; 600 601 Type pt() { 602 return resultInfo.pt; 603 } 604 605 KindSelector pkind() { 606 return resultInfo.pkind; 607 } 608 609/* ************************************************************************ 610 * Visitor methods 611 *************************************************************************/ 612 613 /** Visitor argument: the current environment. 614 */ 615 Env<AttrContext> env; 616 617 /** Visitor argument: the currently expected attribution result. 618 */ 619 ResultInfo resultInfo; 620 621 /** Visitor result: the computed type. 622 */ 623 Type result; 624 625 /** Visitor method: attribute a tree, catching any completion failure 626 * exceptions. Return the tree's type. 627 * 628 * @param tree The tree to be visited. 629 * @param env The environment visitor argument. 630 * @param resultInfo The result info visitor argument. 631 */ 632 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 633 Env<AttrContext> prevEnv = this.env; 634 ResultInfo prevResult = this.resultInfo; 635 try { 636 this.env = env; 637 this.resultInfo = resultInfo; 638 resultInfo.attr(tree, env); 639 if (tree == breakTree && 640 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 641 throw new BreakAttr(copyEnv(env)); 642 } 643 return result; 644 } catch (CompletionFailure ex) { 645 tree.type = syms.errType; 646 return chk.completionError(tree.pos(), ex); 647 } finally { 648 this.env = prevEnv; 649 this.resultInfo = prevResult; 650 } 651 } 652 653 Env<AttrContext> copyEnv(Env<AttrContext> env) { 654 Env<AttrContext> newEnv = 655 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 656 if (newEnv.outer != null) { 657 newEnv.outer = copyEnv(newEnv.outer); 658 } 659 return newEnv; 660 } 661 662 WriteableScope copyScope(WriteableScope sc) { 663 WriteableScope newScope = WriteableScope.create(sc.owner); 664 List<Symbol> elemsList = List.nil(); 665 for (Symbol sym : sc.getSymbols()) { 666 elemsList = elemsList.prepend(sym); 667 } 668 for (Symbol s : elemsList) { 669 newScope.enter(s); 670 } 671 return newScope; 672 } 673 674 /** Derived visitor method: attribute an expression tree. 675 */ 676 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 677 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 678 } 679 680 /** Derived visitor method: attribute an expression tree with 681 * no constraints on the computed type. 682 */ 683 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 684 return attribTree(tree, env, unknownExprInfo); 685 } 686 687 /** Derived visitor method: attribute a type tree. 688 */ 689 public Type attribType(JCTree tree, Env<AttrContext> env) { 690 Type result = attribType(tree, env, Type.noType); 691 return result; 692 } 693 694 /** Derived visitor method: attribute a type tree. 695 */ 696 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 697 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 698 return result; 699 } 700 701 /** Derived visitor method: attribute a statement or definition tree. 702 */ 703 public Type attribStat(JCTree tree, Env<AttrContext> env) { 704 Env<AttrContext> analyzeEnv = 705 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 706 try { 707 return attribTree(tree, env, statInfo); 708 } finally { 709 analyzer.analyzeIfNeeded(tree, analyzeEnv); 710 } 711 } 712 713 /** Attribute a list of expressions, returning a list of types. 714 */ 715 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 716 ListBuffer<Type> ts = new ListBuffer<>(); 717 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 718 ts.append(attribExpr(l.head, env, pt)); 719 return ts.toList(); 720 } 721 722 /** Attribute a list of statements, returning nothing. 723 */ 724 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 725 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 726 attribStat(l.head, env); 727 } 728 729 /** Attribute the arguments in a method call, returning the method kind. 730 */ 731 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 732 KindSelector kind = initialKind; 733 for (JCExpression arg : trees) { 734 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo)); 735 if (argtype.hasTag(DEFERRED)) { 736 kind = KindSelector.of(KindSelector.POLY, kind); 737 } 738 argtypes.append(argtype); 739 } 740 return kind; 741 } 742 743 /** Attribute a type argument list, returning a list of types. 744 * Caller is responsible for calling checkRefTypes. 745 */ 746 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 747 ListBuffer<Type> argtypes = new ListBuffer<>(); 748 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 749 argtypes.append(attribType(l.head, env)); 750 return argtypes.toList(); 751 } 752 753 /** Attribute a type argument list, returning a list of types. 754 * Check that all the types are references. 755 */ 756 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 757 List<Type> types = attribAnyTypes(trees, env); 758 return chk.checkRefTypes(trees, types); 759 } 760 761 /** 762 * Attribute type variables (of generic classes or methods). 763 * Compound types are attributed later in attribBounds. 764 * @param typarams the type variables to enter 765 * @param env the current environment 766 */ 767 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 768 for (JCTypeParameter tvar : typarams) { 769 TypeVar a = (TypeVar)tvar.type; 770 a.tsym.flags_field |= UNATTRIBUTED; 771 a.bound = Type.noType; 772 if (!tvar.bounds.isEmpty()) { 773 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 774 for (JCExpression bound : tvar.bounds.tail) 775 bounds = bounds.prepend(attribType(bound, env)); 776 types.setBounds(a, bounds.reverse()); 777 } else { 778 // if no bounds are given, assume a single bound of 779 // java.lang.Object. 780 types.setBounds(a, List.of(syms.objectType)); 781 } 782 a.tsym.flags_field &= ~UNATTRIBUTED; 783 } 784 for (JCTypeParameter tvar : typarams) { 785 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 786 } 787 } 788 789 /** 790 * Attribute the type references in a list of annotations. 791 */ 792 void attribAnnotationTypes(List<JCAnnotation> annotations, 793 Env<AttrContext> env) { 794 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 795 JCAnnotation a = al.head; 796 attribType(a.annotationType, env); 797 } 798 } 799 800 /** 801 * Attribute a "lazy constant value". 802 * @param env The env for the const value 803 * @param variable The initializer for the const value 804 * @param type The expected type, or null 805 * @see VarSymbol#setLazyConstValue 806 */ 807 public Object attribLazyConstantValue(Env<AttrContext> env, 808 JCVariableDecl variable, 809 Type type) { 810 811 DiagnosticPosition prevLintPos 812 = deferredLintHandler.setPos(variable.pos()); 813 814 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile); 815 try { 816 Type itype = attribExpr(variable.init, env, type); 817 if (itype.constValue() != null) { 818 return coerce(itype, type).constValue(); 819 } else { 820 return null; 821 } 822 } finally { 823 log.useSource(prevSource); 824 deferredLintHandler.setPos(prevLintPos); 825 } 826 } 827 828 /** Attribute type reference in an `extends' or `implements' clause. 829 * Supertypes of anonymous inner classes are usually already attributed. 830 * 831 * @param tree The tree making up the type reference. 832 * @param env The environment current at the reference. 833 * @param classExpected true if only a class is expected here. 834 * @param interfaceExpected true if only an interface is expected here. 835 */ 836 Type attribBase(JCTree tree, 837 Env<AttrContext> env, 838 boolean classExpected, 839 boolean interfaceExpected, 840 boolean checkExtensible) { 841 Type t = tree.type != null ? 842 tree.type : 843 attribType(tree, env); 844 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 845 } 846 Type checkBase(Type t, 847 JCTree tree, 848 Env<AttrContext> env, 849 boolean classExpected, 850 boolean interfaceExpected, 851 boolean checkExtensible) { 852 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ? 853 (((JCTypeApply) tree).clazz).pos() : tree.pos(); 854 if (t.tsym.isAnonymous()) { 855 log.error(pos, "cant.inherit.from.anon"); 856 return types.createErrorType(t); 857 } 858 if (t.isErroneous()) 859 return t; 860 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 861 // check that type variable is already visible 862 if (t.getUpperBound() == null) { 863 log.error(pos, "illegal.forward.ref"); 864 return types.createErrorType(t); 865 } 866 } else { 867 t = chk.checkClassType(pos, t, checkExtensible); 868 } 869 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 870 log.error(pos, "intf.expected.here"); 871 // return errType is necessary since otherwise there might 872 // be undetected cycles which cause attribution to loop 873 return types.createErrorType(t); 874 } else if (checkExtensible && 875 classExpected && 876 (t.tsym.flags() & INTERFACE) != 0) { 877 log.error(pos, "no.intf.expected.here"); 878 return types.createErrorType(t); 879 } 880 if (checkExtensible && 881 ((t.tsym.flags() & FINAL) != 0)) { 882 log.error(pos, 883 "cant.inherit.from.final", t.tsym); 884 } 885 chk.checkNonCyclic(pos, t); 886 return t; 887 } 888 889 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 890 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 891 id.type = env.info.scope.owner.enclClass().type; 892 id.sym = env.info.scope.owner.enclClass(); 893 return id.type; 894 } 895 896 public void visitClassDef(JCClassDecl tree) { 897 Optional<ArgumentAttr.LocalCacheContext> localCacheContext = 898 Optional.ofNullable(env.info.isSpeculative ? 899 argumentAttr.withLocalCacheContext() : null); 900 try { 901 // Local and anonymous classes have not been entered yet, so we need to 902 // do it now. 903 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 904 enter.classEnter(tree, env); 905 } else { 906 // If this class declaration is part of a class level annotation, 907 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 908 // order to simplify later steps and allow for sensible error 909 // messages. 910 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 911 enter.classEnter(tree, env); 912 } 913 914 ClassSymbol c = tree.sym; 915 if (c == null) { 916 // exit in case something drastic went wrong during enter. 917 result = null; 918 } else { 919 // make sure class has been completed: 920 c.complete(); 921 922 // If this class appears as an anonymous class 923 // in a superclass constructor call where 924 // no explicit outer instance is given, 925 // disable implicit outer instance from being passed. 926 // (This would be an illegal access to "this before super"). 927 if (env.info.isSelfCall && 928 env.tree.hasTag(NEWCLASS) && 929 ((JCNewClass)env.tree).encl == null) { 930 c.flags_field |= NOOUTERTHIS; 931 } 932 attribClass(tree.pos(), c); 933 result = tree.type = c.type; 934 } 935 } finally { 936 localCacheContext.ifPresent(LocalCacheContext::leave); 937 } 938 } 939 940 public void visitMethodDef(JCMethodDecl tree) { 941 MethodSymbol m = tree.sym; 942 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 943 944 Lint lint = env.info.lint.augment(m); 945 Lint prevLint = chk.setLint(lint); 946 MethodSymbol prevMethod = chk.setMethod(m); 947 try { 948 deferredLintHandler.flush(tree.pos()); 949 chk.checkDeprecatedAnnotation(tree.pos(), m); 950 951 952 // Create a new environment with local scope 953 // for attributing the method. 954 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 955 localEnv.info.lint = lint; 956 957 attribStats(tree.typarams, localEnv); 958 959 // If we override any other methods, check that we do so properly. 960 // JLS ??? 961 if (m.isStatic()) { 962 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 963 } else { 964 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 965 } 966 chk.checkOverride(env, tree, m); 967 968 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 969 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 970 } 971 972 // Enter all type parameters into the local method scope. 973 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 974 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 975 976 ClassSymbol owner = env.enclClass.sym; 977 if ((owner.flags() & ANNOTATION) != 0 && 978 tree.params.nonEmpty()) 979 log.error(tree.params.head.pos(), 980 "intf.annotation.members.cant.have.params"); 981 982 // Attribute all value parameters. 983 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 984 attribStat(l.head, localEnv); 985 } 986 987 chk.checkVarargsMethodDecl(localEnv, tree); 988 989 // Check that type parameters are well-formed. 990 chk.validate(tree.typarams, localEnv); 991 992 // Check that result type is well-formed. 993 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 994 chk.validate(tree.restype, localEnv); 995 996 // Check that receiver type is well-formed. 997 if (tree.recvparam != null) { 998 // Use a new environment to check the receiver parameter. 999 // Otherwise I get "might not have been initialized" errors. 1000 // Is there a better way? 1001 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 1002 attribType(tree.recvparam, newEnv); 1003 chk.validate(tree.recvparam, newEnv); 1004 } 1005 1006 // annotation method checks 1007 if ((owner.flags() & ANNOTATION) != 0) { 1008 // annotation method cannot have throws clause 1009 if (tree.thrown.nonEmpty()) { 1010 log.error(tree.thrown.head.pos(), 1011 "throws.not.allowed.in.intf.annotation"); 1012 } 1013 // annotation method cannot declare type-parameters 1014 if (tree.typarams.nonEmpty()) { 1015 log.error(tree.typarams.head.pos(), 1016 "intf.annotation.members.cant.have.type.params"); 1017 } 1018 // validate annotation method's return type (could be an annotation type) 1019 chk.validateAnnotationType(tree.restype); 1020 // ensure that annotation method does not clash with members of Object/Annotation 1021 chk.validateAnnotationMethod(tree.pos(), m); 1022 } 1023 1024 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 1025 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 1026 1027 if (tree.body == null) { 1028 // Empty bodies are only allowed for 1029 // abstract, native, or interface methods, or for methods 1030 // in a retrofit signature class. 1031 if (tree.defaultValue != null) { 1032 if ((owner.flags() & ANNOTATION) == 0) 1033 log.error(tree.pos(), 1034 "default.allowed.in.intf.annotation.member"); 1035 } 1036 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0) 1037 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 1038 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) { 1039 if ((owner.flags() & INTERFACE) != 0) { 1040 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 1041 } else { 1042 log.error(tree.pos(), "abstract.meth.cant.have.body"); 1043 } 1044 } else if ((tree.mods.flags & NATIVE) != 0) { 1045 log.error(tree.pos(), "native.meth.cant.have.body"); 1046 } else { 1047 // Add an implicit super() call unless an explicit call to 1048 // super(...) or this(...) is given 1049 // or we are compiling class java.lang.Object. 1050 if (tree.name == names.init && owner.type != syms.objectType) { 1051 JCBlock body = tree.body; 1052 if (body.stats.isEmpty() || 1053 !TreeInfo.isSelfCall(body.stats.head)) { 1054 body.stats = body.stats. 1055 prepend(typeEnter.SuperCall(make.at(body.pos), 1056 List.<Type>nil(), 1057 List.<JCVariableDecl>nil(), 1058 false)); 1059 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 1060 (tree.mods.flags & GENERATEDCONSTR) == 0 && 1061 TreeInfo.isSuperCall(body.stats.head)) { 1062 // enum constructors are not allowed to call super 1063 // directly, so make sure there aren't any super calls 1064 // in enum constructors, except in the compiler 1065 // generated one. 1066 log.error(tree.body.stats.head.pos(), 1067 "call.to.super.not.allowed.in.enum.ctor", 1068 env.enclClass.sym); 1069 } 1070 } 1071 1072 // Attribute all type annotations in the body 1073 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null); 1074 annotate.flush(); 1075 1076 // Attribute method body. 1077 attribStat(tree.body, localEnv); 1078 } 1079 1080 localEnv.info.scope.leave(); 1081 result = tree.type = m.type; 1082 } finally { 1083 chk.setLint(prevLint); 1084 chk.setMethod(prevMethod); 1085 } 1086 } 1087 1088 public void visitVarDef(JCVariableDecl tree) { 1089 // Local variables have not been entered yet, so we need to do it now: 1090 if (env.info.scope.owner.kind == MTH) { 1091 if (tree.sym != null) { 1092 // parameters have already been entered 1093 env.info.scope.enter(tree.sym); 1094 } else { 1095 try { 1096 annotate.blockAnnotations(); 1097 memberEnter.memberEnter(tree, env); 1098 } finally { 1099 annotate.unblockAnnotations(); 1100 } 1101 } 1102 } else { 1103 if (tree.init != null) { 1104 // Field initializer expression need to be entered. 1105 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos()); 1106 annotate.flush(); 1107 } 1108 } 1109 1110 VarSymbol v = tree.sym; 1111 Lint lint = env.info.lint.augment(v); 1112 Lint prevLint = chk.setLint(lint); 1113 1114 // Check that the variable's declared type is well-formed. 1115 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1116 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1117 (tree.sym.flags() & PARAMETER) != 0; 1118 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1119 1120 try { 1121 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1122 deferredLintHandler.flush(tree.pos()); 1123 chk.checkDeprecatedAnnotation(tree.pos(), v); 1124 1125 if (tree.init != null) { 1126 if ((v.flags_field & FINAL) == 0 || 1127 !memberEnter.needsLazyConstValue(tree.init)) { 1128 // Not a compile-time constant 1129 // Attribute initializer in a new environment 1130 // with the declared variable as owner. 1131 // Check that initializer conforms to variable's declared type. 1132 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1133 initEnv.info.lint = lint; 1134 // In order to catch self-references, we set the variable's 1135 // declaration position to maximal possible value, effectively 1136 // marking the variable as undefined. 1137 initEnv.info.enclVar = v; 1138 attribExpr(tree.init, initEnv, v.type); 1139 } 1140 } 1141 result = tree.type = v.type; 1142 } 1143 finally { 1144 chk.setLint(prevLint); 1145 } 1146 } 1147 1148 public void visitSkip(JCSkip tree) { 1149 result = null; 1150 } 1151 1152 public void visitBlock(JCBlock tree) { 1153 if (env.info.scope.owner.kind == TYP) { 1154 // Block is a static or instance initializer; 1155 // let the owner of the environment be a freshly 1156 // created BLOCK-method. 1157 Symbol fakeOwner = 1158 new MethodSymbol(tree.flags | BLOCK | 1159 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1160 env.info.scope.owner); 1161 final Env<AttrContext> localEnv = 1162 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1163 1164 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1165 // Attribute all type annotations in the block 1166 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null); 1167 annotate.flush(); 1168 attribStats(tree.stats, localEnv); 1169 1170 { 1171 // Store init and clinit type annotations with the ClassSymbol 1172 // to allow output in Gen.normalizeDefs. 1173 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1174 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1175 if ((tree.flags & STATIC) != 0) { 1176 cs.appendClassInitTypeAttributes(tas); 1177 } else { 1178 cs.appendInitTypeAttributes(tas); 1179 } 1180 } 1181 } else { 1182 // Create a new local environment with a local scope. 1183 Env<AttrContext> localEnv = 1184 env.dup(tree, env.info.dup(env.info.scope.dup())); 1185 try { 1186 attribStats(tree.stats, localEnv); 1187 } finally { 1188 localEnv.info.scope.leave(); 1189 } 1190 } 1191 result = null; 1192 } 1193 1194 public void visitDoLoop(JCDoWhileLoop tree) { 1195 attribStat(tree.body, env.dup(tree)); 1196 attribExpr(tree.cond, env, syms.booleanType); 1197 result = null; 1198 } 1199 1200 public void visitWhileLoop(JCWhileLoop tree) { 1201 attribExpr(tree.cond, env, syms.booleanType); 1202 attribStat(tree.body, env.dup(tree)); 1203 result = null; 1204 } 1205 1206 public void visitForLoop(JCForLoop tree) { 1207 Env<AttrContext> loopEnv = 1208 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1209 try { 1210 attribStats(tree.init, loopEnv); 1211 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1212 loopEnv.tree = tree; // before, we were not in loop! 1213 attribStats(tree.step, loopEnv); 1214 attribStat(tree.body, loopEnv); 1215 result = null; 1216 } 1217 finally { 1218 loopEnv.info.scope.leave(); 1219 } 1220 } 1221 1222 public void visitForeachLoop(JCEnhancedForLoop tree) { 1223 Env<AttrContext> loopEnv = 1224 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1225 try { 1226 //the Formal Parameter of a for-each loop is not in the scope when 1227 //attributing the for-each expression; we mimick this by attributing 1228 //the for-each expression first (against original scope). 1229 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1230 attribStat(tree.var, loopEnv); 1231 chk.checkNonVoid(tree.pos(), exprType); 1232 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1233 if (elemtype == null) { 1234 // or perhaps expr implements Iterable<T>? 1235 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1236 if (base == null) { 1237 log.error(tree.expr.pos(), 1238 "foreach.not.applicable.to.type", 1239 exprType, 1240 diags.fragment("type.req.array.or.iterable")); 1241 elemtype = types.createErrorType(exprType); 1242 } else { 1243 List<Type> iterableParams = base.allparams(); 1244 elemtype = iterableParams.isEmpty() 1245 ? syms.objectType 1246 : types.wildUpperBound(iterableParams.head); 1247 } 1248 } 1249 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1250 loopEnv.tree = tree; // before, we were not in loop! 1251 attribStat(tree.body, loopEnv); 1252 result = null; 1253 } 1254 finally { 1255 loopEnv.info.scope.leave(); 1256 } 1257 } 1258 1259 public void visitLabelled(JCLabeledStatement tree) { 1260 // Check that label is not used in an enclosing statement 1261 Env<AttrContext> env1 = env; 1262 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1263 if (env1.tree.hasTag(LABELLED) && 1264 ((JCLabeledStatement) env1.tree).label == tree.label) { 1265 log.error(tree.pos(), "label.already.in.use", 1266 tree.label); 1267 break; 1268 } 1269 env1 = env1.next; 1270 } 1271 1272 attribStat(tree.body, env.dup(tree)); 1273 result = null; 1274 } 1275 1276 public void visitSwitch(JCSwitch tree) { 1277 Type seltype = attribExpr(tree.selector, env); 1278 1279 Env<AttrContext> switchEnv = 1280 env.dup(tree, env.info.dup(env.info.scope.dup())); 1281 1282 try { 1283 1284 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1285 boolean stringSwitch = false; 1286 if (types.isSameType(seltype, syms.stringType)) { 1287 if (allowStringsInSwitch) { 1288 stringSwitch = true; 1289 } else { 1290 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1291 } 1292 } 1293 if (!enumSwitch && !stringSwitch) 1294 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1295 1296 // Attribute all cases and 1297 // check that there are no duplicate case labels or default clauses. 1298 Set<Object> labels = new HashSet<>(); // The set of case labels. 1299 boolean hasDefault = false; // Is there a default label? 1300 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1301 JCCase c = l.head; 1302 if (c.pat != null) { 1303 if (enumSwitch) { 1304 Symbol sym = enumConstant(c.pat, seltype); 1305 if (sym == null) { 1306 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1307 } else if (!labels.add(sym)) { 1308 log.error(c.pos(), "duplicate.case.label"); 1309 } 1310 } else { 1311 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1312 if (!pattype.hasTag(ERROR)) { 1313 if (pattype.constValue() == null) { 1314 log.error(c.pat.pos(), 1315 (stringSwitch ? "string.const.req" : "const.expr.req")); 1316 } else if (!labels.add(pattype.constValue())) { 1317 log.error(c.pos(), "duplicate.case.label"); 1318 } 1319 } 1320 } 1321 } else if (hasDefault) { 1322 log.error(c.pos(), "duplicate.default.label"); 1323 } else { 1324 hasDefault = true; 1325 } 1326 Env<AttrContext> caseEnv = 1327 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1328 try { 1329 attribStats(c.stats, caseEnv); 1330 } finally { 1331 caseEnv.info.scope.leave(); 1332 addVars(c.stats, switchEnv.info.scope); 1333 } 1334 } 1335 1336 result = null; 1337 } 1338 finally { 1339 switchEnv.info.scope.leave(); 1340 } 1341 } 1342 // where 1343 /** Add any variables defined in stats to the switch scope. */ 1344 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1345 for (;stats.nonEmpty(); stats = stats.tail) { 1346 JCTree stat = stats.head; 1347 if (stat.hasTag(VARDEF)) 1348 switchScope.enter(((JCVariableDecl) stat).sym); 1349 } 1350 } 1351 // where 1352 /** Return the selected enumeration constant symbol, or null. */ 1353 private Symbol enumConstant(JCTree tree, Type enumType) { 1354 if (tree.hasTag(IDENT)) { 1355 JCIdent ident = (JCIdent)tree; 1356 Name name = ident.name; 1357 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1358 if (sym.kind == VAR) { 1359 Symbol s = ident.sym = sym; 1360 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1361 ident.type = s.type; 1362 return ((s.flags_field & Flags.ENUM) == 0) 1363 ? null : s; 1364 } 1365 } 1366 } 1367 return null; 1368 } 1369 1370 public void visitSynchronized(JCSynchronized tree) { 1371 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1372 attribStat(tree.body, env); 1373 result = null; 1374 } 1375 1376 public void visitTry(JCTry tree) { 1377 // Create a new local environment with a local 1378 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1379 try { 1380 boolean isTryWithResource = tree.resources.nonEmpty(); 1381 // Create a nested environment for attributing the try block if needed 1382 Env<AttrContext> tryEnv = isTryWithResource ? 1383 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1384 localEnv; 1385 try { 1386 // Attribute resource declarations 1387 for (JCTree resource : tree.resources) { 1388 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1389 @Override 1390 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1391 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1392 } 1393 }; 1394 ResultInfo twrResult = 1395 new ResultInfo(KindSelector.VAR, 1396 syms.autoCloseableType, 1397 twrContext); 1398 if (resource.hasTag(VARDEF)) { 1399 attribStat(resource, tryEnv); 1400 twrResult.check(resource, resource.type); 1401 1402 //check that resource type cannot throw InterruptedException 1403 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1404 1405 VarSymbol var = ((JCVariableDecl) resource).sym; 1406 var.setData(ElementKind.RESOURCE_VARIABLE); 1407 } else { 1408 attribTree(resource, tryEnv, twrResult); 1409 } 1410 } 1411 // Attribute body 1412 attribStat(tree.body, tryEnv); 1413 } finally { 1414 if (isTryWithResource) 1415 tryEnv.info.scope.leave(); 1416 } 1417 1418 // Attribute catch clauses 1419 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1420 JCCatch c = l.head; 1421 Env<AttrContext> catchEnv = 1422 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1423 try { 1424 Type ctype = attribStat(c.param, catchEnv); 1425 if (TreeInfo.isMultiCatch(c)) { 1426 //multi-catch parameter is implicitly marked as final 1427 c.param.sym.flags_field |= FINAL | UNION; 1428 } 1429 if (c.param.sym.kind == VAR) { 1430 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1431 } 1432 chk.checkType(c.param.vartype.pos(), 1433 chk.checkClassType(c.param.vartype.pos(), ctype), 1434 syms.throwableType); 1435 attribStat(c.body, catchEnv); 1436 } finally { 1437 catchEnv.info.scope.leave(); 1438 } 1439 } 1440 1441 // Attribute finalizer 1442 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1443 result = null; 1444 } 1445 finally { 1446 localEnv.info.scope.leave(); 1447 } 1448 } 1449 1450 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1451 if (!resource.isErroneous() && 1452 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1453 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1454 Symbol close = syms.noSymbol; 1455 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1456 try { 1457 close = rs.resolveQualifiedMethod(pos, 1458 env, 1459 resource, 1460 names.close, 1461 List.<Type>nil(), 1462 List.<Type>nil()); 1463 } 1464 finally { 1465 log.popDiagnosticHandler(discardHandler); 1466 } 1467 if (close.kind == MTH && 1468 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1469 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1470 env.info.lint.isEnabled(LintCategory.TRY)) { 1471 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1472 } 1473 } 1474 } 1475 1476 public void visitConditional(JCConditional tree) { 1477 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1478 1479 tree.polyKind = (!allowPoly || 1480 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly || 1481 isBooleanOrNumeric(env, tree)) ? 1482 PolyKind.STANDALONE : PolyKind.POLY; 1483 1484 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1485 //this means we are returning a poly conditional from void-compatible lambda expression 1486 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1487 result = tree.type = types.createErrorType(resultInfo.pt); 1488 return; 1489 } 1490 1491 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1492 unknownExprInfo : 1493 resultInfo.dup(conditionalContext(resultInfo.checkContext)); 1494 1495 Type truetype = attribTree(tree.truepart, env, condInfo); 1496 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1497 1498 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1499 if (condtype.constValue() != null && 1500 truetype.constValue() != null && 1501 falsetype.constValue() != null && 1502 !owntype.hasTag(NONE)) { 1503 //constant folding 1504 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1505 } 1506 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1507 } 1508 //where 1509 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1510 switch (tree.getTag()) { 1511 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1512 ((JCLiteral)tree).typetag == BOOLEAN || 1513 ((JCLiteral)tree).typetag == BOT; 1514 case LAMBDA: case REFERENCE: return false; 1515 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1516 case CONDEXPR: 1517 JCConditional condTree = (JCConditional)tree; 1518 return isBooleanOrNumeric(env, condTree.truepart) && 1519 isBooleanOrNumeric(env, condTree.falsepart); 1520 case APPLY: 1521 JCMethodInvocation speculativeMethodTree = 1522 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo); 1523 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1524 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1525 env.enclClass.type : 1526 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1527 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1528 return primitiveOrBoxed(owntype); 1529 case NEWCLASS: 1530 JCExpression className = 1531 removeClassParams.translate(((JCNewClass)tree).clazz); 1532 JCExpression speculativeNewClassTree = 1533 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo); 1534 return primitiveOrBoxed(speculativeNewClassTree.type); 1535 default: 1536 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type; 1537 return primitiveOrBoxed(speculativeType); 1538 } 1539 } 1540 //where 1541 boolean primitiveOrBoxed(Type t) { 1542 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1543 } 1544 1545 TreeTranslator removeClassParams = new TreeTranslator() { 1546 @Override 1547 public void visitTypeApply(JCTypeApply tree) { 1548 result = translate(tree.clazz); 1549 } 1550 }; 1551 1552 CheckContext conditionalContext(CheckContext checkContext) { 1553 return new Check.NestedCheckContext(checkContext) { 1554 //this will use enclosing check context to check compatibility of 1555 //subexpression against target type; if we are in a method check context, 1556 //depending on whether boxing is allowed, we could have incompatibilities 1557 @Override 1558 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1559 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1560 } 1561 }; 1562 } 1563 1564 /** Compute the type of a conditional expression, after 1565 * checking that it exists. See JLS 15.25. Does not take into 1566 * account the special case where condition and both arms 1567 * are constants. 1568 * 1569 * @param pos The source position to be used for error 1570 * diagnostics. 1571 * @param thentype The type of the expression's then-part. 1572 * @param elsetype The type of the expression's else-part. 1573 */ 1574 Type condType(DiagnosticPosition pos, 1575 Type thentype, Type elsetype) { 1576 // If same type, that is the result 1577 if (types.isSameType(thentype, elsetype)) 1578 return thentype.baseType(); 1579 1580 Type thenUnboxed = (thentype.isPrimitive()) 1581 ? thentype : types.unboxedType(thentype); 1582 Type elseUnboxed = (elsetype.isPrimitive()) 1583 ? elsetype : types.unboxedType(elsetype); 1584 1585 // Otherwise, if both arms can be converted to a numeric 1586 // type, return the least numeric type that fits both arms 1587 // (i.e. return larger of the two, or return int if one 1588 // arm is short, the other is char). 1589 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1590 // If one arm has an integer subrange type (i.e., byte, 1591 // short, or char), and the other is an integer constant 1592 // that fits into the subrange, return the subrange type. 1593 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1594 elseUnboxed.hasTag(INT) && 1595 types.isAssignable(elseUnboxed, thenUnboxed)) { 1596 return thenUnboxed.baseType(); 1597 } 1598 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1599 thenUnboxed.hasTag(INT) && 1600 types.isAssignable(thenUnboxed, elseUnboxed)) { 1601 return elseUnboxed.baseType(); 1602 } 1603 1604 for (TypeTag tag : primitiveTags) { 1605 Type candidate = syms.typeOfTag[tag.ordinal()]; 1606 if (types.isSubtype(thenUnboxed, candidate) && 1607 types.isSubtype(elseUnboxed, candidate)) { 1608 return candidate; 1609 } 1610 } 1611 } 1612 1613 // Those were all the cases that could result in a primitive 1614 if (thentype.isPrimitive()) 1615 thentype = types.boxedClass(thentype).type; 1616 if (elsetype.isPrimitive()) 1617 elsetype = types.boxedClass(elsetype).type; 1618 1619 if (types.isSubtype(thentype, elsetype)) 1620 return elsetype.baseType(); 1621 if (types.isSubtype(elsetype, thentype)) 1622 return thentype.baseType(); 1623 1624 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1625 log.error(pos, "neither.conditional.subtype", 1626 thentype, elsetype); 1627 return thentype.baseType(); 1628 } 1629 1630 // both are known to be reference types. The result is 1631 // lub(thentype,elsetype). This cannot fail, as it will 1632 // always be possible to infer "Object" if nothing better. 1633 return types.lub(thentype.baseType(), elsetype.baseType()); 1634 } 1635 1636 final static TypeTag[] primitiveTags = new TypeTag[]{ 1637 BYTE, 1638 CHAR, 1639 SHORT, 1640 INT, 1641 LONG, 1642 FLOAT, 1643 DOUBLE, 1644 BOOLEAN, 1645 }; 1646 1647 public void visitIf(JCIf tree) { 1648 attribExpr(tree.cond, env, syms.booleanType); 1649 attribStat(tree.thenpart, env); 1650 if (tree.elsepart != null) 1651 attribStat(tree.elsepart, env); 1652 chk.checkEmptyIf(tree); 1653 result = null; 1654 } 1655 1656 public void visitExec(JCExpressionStatement tree) { 1657 //a fresh environment is required for 292 inference to work properly --- 1658 //see Infer.instantiatePolymorphicSignatureInstance() 1659 Env<AttrContext> localEnv = env.dup(tree); 1660 attribExpr(tree.expr, localEnv); 1661 result = null; 1662 } 1663 1664 public void visitBreak(JCBreak tree) { 1665 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1666 result = null; 1667 } 1668 1669 public void visitContinue(JCContinue tree) { 1670 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1671 result = null; 1672 } 1673 //where 1674 /** Return the target of a break or continue statement, if it exists, 1675 * report an error if not. 1676 * Note: The target of a labelled break or continue is the 1677 * (non-labelled) statement tree referred to by the label, 1678 * not the tree representing the labelled statement itself. 1679 * 1680 * @param pos The position to be used for error diagnostics 1681 * @param tag The tag of the jump statement. This is either 1682 * Tree.BREAK or Tree.CONTINUE. 1683 * @param label The label of the jump statement, or null if no 1684 * label is given. 1685 * @param env The environment current at the jump statement. 1686 */ 1687 private JCTree findJumpTarget(DiagnosticPosition pos, 1688 JCTree.Tag tag, 1689 Name label, 1690 Env<AttrContext> env) { 1691 // Search environments outwards from the point of jump. 1692 Env<AttrContext> env1 = env; 1693 LOOP: 1694 while (env1 != null) { 1695 switch (env1.tree.getTag()) { 1696 case LABELLED: 1697 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1698 if (label == labelled.label) { 1699 // If jump is a continue, check that target is a loop. 1700 if (tag == CONTINUE) { 1701 if (!labelled.body.hasTag(DOLOOP) && 1702 !labelled.body.hasTag(WHILELOOP) && 1703 !labelled.body.hasTag(FORLOOP) && 1704 !labelled.body.hasTag(FOREACHLOOP)) 1705 log.error(pos, "not.loop.label", label); 1706 // Found labelled statement target, now go inwards 1707 // to next non-labelled tree. 1708 return TreeInfo.referencedStatement(labelled); 1709 } else { 1710 return labelled; 1711 } 1712 } 1713 break; 1714 case DOLOOP: 1715 case WHILELOOP: 1716 case FORLOOP: 1717 case FOREACHLOOP: 1718 if (label == null) return env1.tree; 1719 break; 1720 case SWITCH: 1721 if (label == null && tag == BREAK) return env1.tree; 1722 break; 1723 case LAMBDA: 1724 case METHODDEF: 1725 case CLASSDEF: 1726 break LOOP; 1727 default: 1728 } 1729 env1 = env1.next; 1730 } 1731 if (label != null) 1732 log.error(pos, "undef.label", label); 1733 else if (tag == CONTINUE) 1734 log.error(pos, "cont.outside.loop"); 1735 else 1736 log.error(pos, "break.outside.switch.loop"); 1737 return null; 1738 } 1739 1740 public void visitReturn(JCReturn tree) { 1741 // Check that there is an enclosing method which is 1742 // nested within than the enclosing class. 1743 if (env.info.returnResult == null) { 1744 log.error(tree.pos(), "ret.outside.meth"); 1745 } else { 1746 // Attribute return expression, if it exists, and check that 1747 // it conforms to result type of enclosing method. 1748 if (tree.expr != null) { 1749 if (env.info.returnResult.pt.hasTag(VOID)) { 1750 env.info.returnResult.checkContext.report(tree.expr.pos(), 1751 diags.fragment("unexpected.ret.val")); 1752 } 1753 attribTree(tree.expr, env, env.info.returnResult); 1754 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1755 !env.info.returnResult.pt.hasTag(NONE)) { 1756 env.info.returnResult.checkContext.report(tree.pos(), 1757 diags.fragment("missing.ret.val")); 1758 } 1759 } 1760 result = null; 1761 } 1762 1763 public void visitThrow(JCThrow tree) { 1764 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1765 if (allowPoly) { 1766 chk.checkType(tree, owntype, syms.throwableType); 1767 } 1768 result = null; 1769 } 1770 1771 public void visitAssert(JCAssert tree) { 1772 attribExpr(tree.cond, env, syms.booleanType); 1773 if (tree.detail != null) { 1774 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1775 } 1776 result = null; 1777 } 1778 1779 /** Visitor method for method invocations. 1780 * NOTE: The method part of an application will have in its type field 1781 * the return type of the method, not the method's type itself! 1782 */ 1783 public void visitApply(JCMethodInvocation tree) { 1784 // The local environment of a method application is 1785 // a new environment nested in the current one. 1786 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1787 1788 // The types of the actual method arguments. 1789 List<Type> argtypes; 1790 1791 // The types of the actual method type arguments. 1792 List<Type> typeargtypes = null; 1793 1794 Name methName = TreeInfo.name(tree.meth); 1795 1796 boolean isConstructorCall = 1797 methName == names._this || methName == names._super; 1798 1799 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1800 if (isConstructorCall) { 1801 // We are seeing a ...this(...) or ...super(...) call. 1802 // Check that this is the first statement in a constructor. 1803 if (checkFirstConstructorStat(tree, env)) { 1804 1805 // Record the fact 1806 // that this is a constructor call (using isSelfCall). 1807 localEnv.info.isSelfCall = true; 1808 1809 // Attribute arguments, yielding list of argument types. 1810 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf); 1811 argtypes = argtypesBuf.toList(); 1812 typeargtypes = attribTypes(tree.typeargs, localEnv); 1813 1814 // Variable `site' points to the class in which the called 1815 // constructor is defined. 1816 Type site = env.enclClass.sym.type; 1817 if (methName == names._super) { 1818 if (site == syms.objectType) { 1819 log.error(tree.meth.pos(), "no.superclass", site); 1820 site = types.createErrorType(syms.objectType); 1821 } else { 1822 site = types.supertype(site); 1823 } 1824 } 1825 1826 if (site.hasTag(CLASS)) { 1827 Type encl = site.getEnclosingType(); 1828 while (encl != null && encl.hasTag(TYPEVAR)) 1829 encl = encl.getUpperBound(); 1830 if (encl.hasTag(CLASS)) { 1831 // we are calling a nested class 1832 1833 if (tree.meth.hasTag(SELECT)) { 1834 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1835 1836 // We are seeing a prefixed call, of the form 1837 // <expr>.super(...). 1838 // Check that the prefix expression conforms 1839 // to the outer instance type of the class. 1840 chk.checkRefType(qualifier.pos(), 1841 attribExpr(qualifier, localEnv, 1842 encl)); 1843 } else if (methName == names._super) { 1844 // qualifier omitted; check for existence 1845 // of an appropriate implicit qualifier. 1846 rs.resolveImplicitThis(tree.meth.pos(), 1847 localEnv, site, true); 1848 } 1849 } else if (tree.meth.hasTag(SELECT)) { 1850 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1851 site.tsym); 1852 } 1853 1854 // if we're calling a java.lang.Enum constructor, 1855 // prefix the implicit String and int parameters 1856 if (site.tsym == syms.enumSym) 1857 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1858 1859 // Resolve the called constructor under the assumption 1860 // that we are referring to a superclass instance of the 1861 // current instance (JLS ???). 1862 boolean selectSuperPrev = localEnv.info.selectSuper; 1863 localEnv.info.selectSuper = true; 1864 localEnv.info.pendingResolutionPhase = null; 1865 Symbol sym = rs.resolveConstructor( 1866 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1867 localEnv.info.selectSuper = selectSuperPrev; 1868 1869 // Set method symbol to resolved constructor... 1870 TreeInfo.setSymbol(tree.meth, sym); 1871 1872 // ...and check that it is legal in the current context. 1873 // (this will also set the tree's type) 1874 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1875 checkId(tree.meth, site, sym, localEnv, 1876 new ResultInfo(kind, mpt)); 1877 } 1878 // Otherwise, `site' is an error type and we do nothing 1879 } 1880 result = tree.type = syms.voidType; 1881 } else { 1882 // Otherwise, we are seeing a regular method call. 1883 // Attribute the arguments, yielding list of argument types, ... 1884 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1885 argtypes = argtypesBuf.toList(); 1886 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1887 1888 // ... and attribute the method using as a prototype a methodtype 1889 // whose formal argument types is exactly the list of actual 1890 // arguments (this will also set the method symbol). 1891 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1892 localEnv.info.pendingResolutionPhase = null; 1893 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1894 1895 // Compute the result type. 1896 Type restype = mtype.getReturnType(); 1897 if (restype.hasTag(WILDCARD)) 1898 throw new AssertionError(mtype); 1899 1900 Type qualifier = (tree.meth.hasTag(SELECT)) 1901 ? ((JCFieldAccess) tree.meth).selected.type 1902 : env.enclClass.sym.type; 1903 Symbol msym = TreeInfo.symbol(tree.meth); 1904 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype); 1905 1906 chk.checkRefTypes(tree.typeargs, typeargtypes); 1907 1908 // Check that value of resulting type is admissible in the 1909 // current context. Also, capture the return type 1910 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true); 1911 result = check(tree, capturedRes, KindSelector.VAL, resultInfo); 1912 } 1913 chk.validate(tree.typeargs, localEnv); 1914 } 1915 //where 1916 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1917 if (msym != null && 1918 msym.owner == syms.objectType.tsym && 1919 methodName == names.getClass && 1920 argtypes.isEmpty()) { 1921 // as a special case, x.getClass() has type Class<? extends |X|> 1922 return new ClassType(restype.getEnclosingType(), 1923 List.<Type>of(new WildcardType(types.erasure(qualifierType), 1924 BoundKind.EXTENDS, 1925 syms.boundClass)), 1926 restype.tsym, 1927 restype.getMetadata()); 1928 } else if (msym != null && 1929 msym.owner == syms.arrayClass && 1930 methodName == names.clone && 1931 types.isArray(qualifierType)) { 1932 // as a special case, array.clone() has a result that is 1933 // the same as static type of the array being cloned 1934 return qualifierType; 1935 } else { 1936 return restype; 1937 } 1938 } 1939 1940 /** Check that given application node appears as first statement 1941 * in a constructor call. 1942 * @param tree The application node 1943 * @param env The environment current at the application. 1944 */ 1945 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1946 JCMethodDecl enclMethod = env.enclMethod; 1947 if (enclMethod != null && enclMethod.name == names.init) { 1948 JCBlock body = enclMethod.body; 1949 if (body.stats.head.hasTag(EXEC) && 1950 ((JCExpressionStatement) body.stats.head).expr == tree) 1951 return true; 1952 } 1953 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1954 TreeInfo.name(tree.meth)); 1955 return false; 1956 } 1957 1958 /** Obtain a method type with given argument types. 1959 */ 1960 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1961 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass); 1962 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1963 } 1964 1965 public void visitNewClass(final JCNewClass tree) { 1966 Type owntype = types.createErrorType(tree.type); 1967 1968 // The local environment of a class creation is 1969 // a new environment nested in the current one. 1970 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1971 1972 // The anonymous inner class definition of the new expression, 1973 // if one is defined by it. 1974 JCClassDecl cdef = tree.def; 1975 1976 // If enclosing class is given, attribute it, and 1977 // complete class name to be fully qualified 1978 JCExpression clazz = tree.clazz; // Class field following new 1979 JCExpression clazzid; // Identifier in class field 1980 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1981 annoclazzid = null; 1982 1983 if (clazz.hasTag(TYPEAPPLY)) { 1984 clazzid = ((JCTypeApply) clazz).clazz; 1985 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1986 annoclazzid = (JCAnnotatedType) clazzid; 1987 clazzid = annoclazzid.underlyingType; 1988 } 1989 } else { 1990 if (clazz.hasTag(ANNOTATED_TYPE)) { 1991 annoclazzid = (JCAnnotatedType) clazz; 1992 clazzid = annoclazzid.underlyingType; 1993 } else { 1994 clazzid = clazz; 1995 } 1996 } 1997 1998 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1999 2000 if (tree.encl != null) { 2001 // We are seeing a qualified new, of the form 2002 // <expr>.new C <...> (...) ... 2003 // In this case, we let clazz stand for the name of the 2004 // allocated class C prefixed with the type of the qualifier 2005 // expression, so that we can 2006 // resolve it with standard techniques later. I.e., if 2007 // <expr> has type T, then <expr>.new C <...> (...) 2008 // yields a clazz T.C. 2009 Type encltype = chk.checkRefType(tree.encl.pos(), 2010 attribExpr(tree.encl, env)); 2011 // TODO 308: in <expr>.new C, do we also want to add the type annotations 2012 // from expr to the combined type, or not? Yes, do this. 2013 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 2014 ((JCIdent) clazzid).name); 2015 2016 EndPosTable endPosTable = this.env.toplevel.endPositions; 2017 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 2018 if (clazz.hasTag(ANNOTATED_TYPE)) { 2019 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 2020 List<JCAnnotation> annos = annoType.annotations; 2021 2022 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 2023 clazzid1 = make.at(tree.pos). 2024 TypeApply(clazzid1, 2025 ((JCTypeApply) clazz).arguments); 2026 } 2027 2028 clazzid1 = make.at(tree.pos). 2029 AnnotatedType(annos, clazzid1); 2030 } else if (clazz.hasTag(TYPEAPPLY)) { 2031 clazzid1 = make.at(tree.pos). 2032 TypeApply(clazzid1, 2033 ((JCTypeApply) clazz).arguments); 2034 } 2035 2036 clazz = clazzid1; 2037 } 2038 2039 // Attribute clazz expression and store 2040 // symbol + type back into the attributed tree. 2041 Type clazztype; 2042 2043 try { 2044 env.info.isNewClass = true; 2045 clazztype = TreeInfo.isEnumInit(env.tree) ? 2046 attribIdentAsEnumType(env, (JCIdent)clazz) : 2047 attribType(clazz, env); 2048 } finally { 2049 env.info.isNewClass = false; 2050 } 2051 2052 clazztype = chk.checkDiamond(tree, clazztype); 2053 chk.validate(clazz, localEnv); 2054 if (tree.encl != null) { 2055 // We have to work in this case to store 2056 // symbol + type back into the attributed tree. 2057 tree.clazz.type = clazztype; 2058 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 2059 clazzid.type = ((JCIdent) clazzid).sym.type; 2060 if (annoclazzid != null) { 2061 annoclazzid.type = clazzid.type; 2062 } 2063 if (!clazztype.isErroneous()) { 2064 if (cdef != null && clazztype.tsym.isInterface()) { 2065 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 2066 } else if (clazztype.tsym.isStatic()) { 2067 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 2068 } 2069 } 2070 } else if (!clazztype.tsym.isInterface() && 2071 clazztype.getEnclosingType().hasTag(CLASS)) { 2072 // Check for the existence of an apropos outer instance 2073 rs.resolveImplicitThis(tree.pos(), env, clazztype); 2074 } 2075 2076 // Attribute constructor arguments. 2077 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 2078 final KindSelector pkind = 2079 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 2080 List<Type> argtypes = argtypesBuf.toList(); 2081 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 2082 2083 // If we have made no mistakes in the class type... 2084 if (clazztype.hasTag(CLASS)) { 2085 // Enums may not be instantiated except implicitly 2086 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 2087 (!env.tree.hasTag(VARDEF) || 2088 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 2089 ((JCVariableDecl) env.tree).init != tree)) 2090 log.error(tree.pos(), "enum.cant.be.instantiated"); 2091 2092 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2093 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2094 boolean skipNonDiamondPath = false; 2095 // Check that class is not abstract 2096 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2097 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2098 log.error(tree.pos(), "abstract.cant.be.instantiated", 2099 clazztype.tsym); 2100 skipNonDiamondPath = true; 2101 } else if (cdef != null && clazztype.tsym.isInterface()) { 2102 // Check that no constructor arguments are given to 2103 // anonymous classes implementing an interface 2104 if (!argtypes.isEmpty()) 2105 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2106 2107 if (!typeargtypes.isEmpty()) 2108 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2109 2110 // Error recovery: pretend no arguments were supplied. 2111 argtypes = List.nil(); 2112 typeargtypes = List.nil(); 2113 skipNonDiamondPath = true; 2114 } 2115 if (TreeInfo.isDiamond(tree)) { 2116 ClassType site = new ClassType(clazztype.getEnclosingType(), 2117 clazztype.tsym.type.getTypeArguments(), 2118 clazztype.tsym, 2119 clazztype.getMetadata()); 2120 2121 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2122 diamondEnv.info.selectSuper = cdef != null; 2123 diamondEnv.info.pendingResolutionPhase = null; 2124 2125 //if the type of the instance creation expression is a class type 2126 //apply method resolution inference (JLS 15.12.2.7). The return type 2127 //of the resolved constructor will be a partially instantiated type 2128 Symbol constructor = rs.resolveDiamond(tree.pos(), 2129 diamondEnv, 2130 site, 2131 argtypes, 2132 typeargtypes); 2133 tree.constructor = constructor.baseSymbol(); 2134 2135 final TypeSymbol csym = clazztype.tsym; 2136 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), 2137 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2138 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2139 constructorType = checkId(tree, site, 2140 constructor, 2141 diamondEnv, 2142 diamondResult); 2143 2144 tree.clazz.type = types.createErrorType(clazztype); 2145 if (!constructorType.isErroneous()) { 2146 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2147 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2148 } 2149 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2150 } 2151 2152 // Resolve the called constructor under the assumption 2153 // that we are referring to a superclass instance of the 2154 // current instance (JLS ???). 2155 else if (!skipNonDiamondPath) { 2156 //the following code alters some of the fields in the current 2157 //AttrContext - hence, the current context must be dup'ed in 2158 //order to avoid downstream failures 2159 Env<AttrContext> rsEnv = localEnv.dup(tree); 2160 rsEnv.info.selectSuper = cdef != null; 2161 rsEnv.info.pendingResolutionPhase = null; 2162 tree.constructor = rs.resolveConstructor( 2163 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2164 if (cdef == null) { //do not check twice! 2165 tree.constructorType = checkId(tree, 2166 clazztype, 2167 tree.constructor, 2168 rsEnv, 2169 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2170 if (rsEnv.info.lastResolveVarargs()) 2171 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2172 } 2173 } 2174 2175 if (cdef != null) { 2176 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2177 return; 2178 } 2179 2180 if (tree.constructor != null && tree.constructor.kind == MTH) 2181 owntype = clazztype; 2182 } 2183 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2184 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2185 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2186 //we need to wait for inference to finish and then replace inference vars in the constructor type 2187 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2188 instantiatedContext -> { 2189 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2190 }); 2191 } 2192 chk.validate(tree.typeargs, localEnv); 2193 } 2194 2195 // where 2196 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2197 JCClassDecl cdef, Env<AttrContext> localEnv, 2198 List<Type> argtypes, List<Type> typeargtypes, 2199 KindSelector pkind) { 2200 // We are seeing an anonymous class instance creation. 2201 // In this case, the class instance creation 2202 // expression 2203 // 2204 // E.new <typeargs1>C<typargs2>(args) { ... } 2205 // 2206 // is represented internally as 2207 // 2208 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2209 // 2210 // This expression is then *transformed* as follows: 2211 // 2212 // (1) add an extends or implements clause 2213 // (2) add a constructor. 2214 // 2215 // For instance, if C is a class, and ET is the type of E, 2216 // the expression 2217 // 2218 // E.new <typeargs1>C<typargs2>(args) { ... } 2219 // 2220 // is translated to (where X is a fresh name and typarams is the 2221 // parameter list of the super constructor): 2222 // 2223 // new <typeargs1>X(<*nullchk*>E, args) where 2224 // X extends C<typargs2> { 2225 // <typarams> X(ET e, args) { 2226 // e.<typeargs1>super(args) 2227 // } 2228 // ... 2229 // } 2230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2231 final boolean isDiamond = TreeInfo.isDiamond(tree); 2232 if (isDiamond 2233 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2234 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2235 final ResultInfo resultInfoForClassDefinition = this.resultInfo; 2236 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2237 instantiatedContext -> { 2238 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2239 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type); 2240 ResultInfo prevResult = this.resultInfo; 2241 try { 2242 this.resultInfo = resultInfoForClassDefinition; 2243 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, 2244 localEnv, argtypes, typeargtypes, pkind); 2245 } finally { 2246 this.resultInfo = prevResult; 2247 } 2248 }); 2249 } else { 2250 if (isDiamond && clazztype.hasTag(CLASS)) { 2251 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2252 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2253 // One or more types inferred in the previous steps is non-denotable. 2254 Fragment fragment = Diamond(clazztype.tsym); 2255 log.error(tree.clazz.pos(), 2256 Errors.CantApplyDiamond1( 2257 fragment, 2258 invalidDiamondArgs.size() > 1 ? 2259 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2260 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2261 } 2262 // For <>(){}, inferred types must also be accessible. 2263 for (Type t : clazztype.getTypeArguments()) { 2264 rs.checkAccessibleType(env, t); 2265 } 2266 } 2267 2268 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2269 // false for isInterface call even when the original type is an interface. 2270 boolean implementing = clazztype.tsym.isInterface() || 2271 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2272 2273 if (implementing) { 2274 cdef.implementing = List.of(clazz); 2275 } else { 2276 cdef.extending = clazz; 2277 } 2278 2279 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2280 isSerializable(clazztype)) { 2281 localEnv.info.isSerializable = true; 2282 } 2283 2284 attribStat(cdef, localEnv); 2285 2286 List<Type> finalargtypes; 2287 // If an outer instance is given, 2288 // prefix it to the constructor arguments 2289 // and delete it from the new expression 2290 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2291 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2292 finalargtypes = argtypes.prepend(tree.encl.type); 2293 tree.encl = null; 2294 } else { 2295 finalargtypes = argtypes; 2296 } 2297 2298 // Reassign clazztype and recompute constructor. As this necessarily involves 2299 // another attribution pass for deferred types in the case of <>, replicate 2300 // them. Original arguments have right decorations already. 2301 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2302 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2303 } 2304 2305 clazztype = cdef.sym.type; 2306 Symbol sym = tree.constructor = rs.resolveConstructor( 2307 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2308 Assert.check(!sym.kind.isResolutionError()); 2309 tree.constructor = sym; 2310 tree.constructorType = checkId(tree, 2311 clazztype, 2312 tree.constructor, 2313 localEnv, 2314 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE)); 2315 } 2316 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2317 clazztype : types.createErrorType(tree.type); 2318 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK)); 2319 chk.validate(tree.typeargs, localEnv); 2320 } 2321 2322 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) { 2323 return new Check.NestedCheckContext(checkContext) { 2324 @Override 2325 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2326 enclosingContext.report(clazz.clazz, 2327 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", tsym), details)); 2328 } 2329 }; 2330 } 2331 2332 /** Make an attributed null check tree. 2333 */ 2334 public JCExpression makeNullCheck(JCExpression arg) { 2335 // optimization: X.this is never null; skip null check 2336 Name name = TreeInfo.name(arg); 2337 if (name == names._this || name == names._super) return arg; 2338 2339 JCTree.Tag optag = NULLCHK; 2340 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2341 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2342 tree.type = arg.type; 2343 return tree; 2344 } 2345 2346 public void visitNewArray(JCNewArray tree) { 2347 Type owntype = types.createErrorType(tree.type); 2348 Env<AttrContext> localEnv = env.dup(tree); 2349 Type elemtype; 2350 if (tree.elemtype != null) { 2351 elemtype = attribType(tree.elemtype, localEnv); 2352 chk.validate(tree.elemtype, localEnv); 2353 owntype = elemtype; 2354 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2355 attribExpr(l.head, localEnv, syms.intType); 2356 owntype = new ArrayType(owntype, syms.arrayClass); 2357 } 2358 } else { 2359 // we are seeing an untyped aggregate { ... } 2360 // this is allowed only if the prototype is an array 2361 if (pt().hasTag(ARRAY)) { 2362 elemtype = types.elemtype(pt()); 2363 } else { 2364 if (!pt().hasTag(ERROR)) { 2365 log.error(tree.pos(), "illegal.initializer.for.type", 2366 pt()); 2367 } 2368 elemtype = types.createErrorType(pt()); 2369 } 2370 } 2371 if (tree.elems != null) { 2372 attribExprs(tree.elems, localEnv, elemtype); 2373 owntype = new ArrayType(elemtype, syms.arrayClass); 2374 } 2375 if (!types.isReifiable(elemtype)) 2376 log.error(tree.pos(), "generic.array.creation"); 2377 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2378 } 2379 2380 /* 2381 * A lambda expression can only be attributed when a target-type is available. 2382 * In addition, if the target-type is that of a functional interface whose 2383 * descriptor contains inference variables in argument position the lambda expression 2384 * is 'stuck' (see DeferredAttr). 2385 */ 2386 @Override 2387 public void visitLambda(final JCLambda that) { 2388 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2389 if (pt().hasTag(NONE)) { 2390 //lambda only allowed in assignment or method invocation/cast context 2391 log.error(that.pos(), "unexpected.lambda"); 2392 } 2393 result = that.type = types.createErrorType(pt()); 2394 return; 2395 } 2396 //create an environment for attribution of the lambda expression 2397 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2398 boolean needsRecovery = 2399 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2400 try { 2401 if (needsRecovery && isSerializable(pt())) { 2402 localEnv.info.isSerializable = true; 2403 } 2404 List<Type> explicitParamTypes = null; 2405 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2406 //attribute lambda parameters 2407 attribStats(that.params, localEnv); 2408 explicitParamTypes = TreeInfo.types(that.params); 2409 } 2410 2411 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes); 2412 Type currentTarget = targetInfo.target; 2413 Type lambdaType = targetInfo.descriptor; 2414 2415 if (currentTarget.isErroneous()) { 2416 result = that.type = currentTarget; 2417 return; 2418 } 2419 2420 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2421 2422 if (lambdaType.hasTag(FORALL)) { 2423 //lambda expression target desc cannot be a generic method 2424 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2425 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2426 result = that.type = types.createErrorType(pt()); 2427 return; 2428 } 2429 2430 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2431 //add param type info in the AST 2432 List<Type> actuals = lambdaType.getParameterTypes(); 2433 List<JCVariableDecl> params = that.params; 2434 2435 boolean arityMismatch = false; 2436 2437 while (params.nonEmpty()) { 2438 if (actuals.isEmpty()) { 2439 //not enough actuals to perform lambda parameter inference 2440 arityMismatch = true; 2441 } 2442 //reset previously set info 2443 Type argType = arityMismatch ? 2444 syms.errType : 2445 actuals.head; 2446 params.head.vartype = make.at(params.head).Type(argType); 2447 params.head.sym = null; 2448 actuals = actuals.isEmpty() ? 2449 actuals : 2450 actuals.tail; 2451 params = params.tail; 2452 } 2453 2454 //attribute lambda parameters 2455 attribStats(that.params, localEnv); 2456 2457 if (arityMismatch) { 2458 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2459 result = that.type = types.createErrorType(currentTarget); 2460 return; 2461 } 2462 } 2463 2464 //from this point on, no recovery is needed; if we are in assignment context 2465 //we will be able to attribute the whole lambda body, regardless of errors; 2466 //if we are in a 'check' method context, and the lambda is not compatible 2467 //with the target-type, it will be recovered anyway in Attr.checkId 2468 needsRecovery = false; 2469 2470 ResultInfo bodyResultInfo = localEnv.info.returnResult = 2471 lambdaBodyResult(that, lambdaType, resultInfo); 2472 2473 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2474 attribTree(that.getBody(), localEnv, bodyResultInfo); 2475 } else { 2476 JCBlock body = (JCBlock)that.body; 2477 attribStats(body.stats, localEnv); 2478 } 2479 2480 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2481 2482 boolean isSpeculativeRound = 2483 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2484 2485 preFlow(that); 2486 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2487 2488 that.type = currentTarget; //avoids recovery at this stage 2489 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2490 2491 if (!isSpeculativeRound) { 2492 //add thrown types as bounds to the thrown types free variables if needed: 2493 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2494 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2495 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2496 2497 chk.unhandled(inferredThrownTypes, thrownTypes); 2498 } 2499 2500 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2501 } 2502 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2503 } catch (Types.FunctionDescriptorLookupError ex) { 2504 JCDiagnostic cause = ex.getDiagnostic(); 2505 resultInfo.checkContext.report(that, cause); 2506 result = that.type = types.createErrorType(pt()); 2507 return; 2508 } catch (Throwable t) { 2509 //when an unexpected exception happens, avoid attempts to attribute the same tree again 2510 //as that would likely cause the same exception again. 2511 needsRecovery = false; 2512 throw t; 2513 } finally { 2514 localEnv.info.scope.leave(); 2515 if (needsRecovery) { 2516 attribTree(that, env, recoveryInfo); 2517 } 2518 } 2519 } 2520 //where 2521 class TargetInfo { 2522 Type target; 2523 Type descriptor; 2524 2525 public TargetInfo(Type target, Type descriptor) { 2526 this.target = target; 2527 this.descriptor = descriptor; 2528 } 2529 } 2530 2531 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) { 2532 Type lambdaType; 2533 Type currentTarget = resultInfo.pt; 2534 if (resultInfo.pt != Type.recoveryType) { 2535 /* We need to adjust the target. If the target is an 2536 * intersection type, for example: SAM & I1 & I2 ... 2537 * the target will be updated to SAM 2538 */ 2539 currentTarget = targetChecker.visit(currentTarget, that); 2540 if (explicitParamTypes != null) { 2541 currentTarget = infer.instantiateFunctionalInterface(that, 2542 currentTarget, explicitParamTypes, resultInfo.checkContext); 2543 } 2544 currentTarget = types.removeWildcards(currentTarget); 2545 lambdaType = types.findDescriptorType(currentTarget); 2546 } else { 2547 currentTarget = Type.recoveryType; 2548 lambdaType = fallbackDescriptorType(that); 2549 } 2550 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) { 2551 //lambda expression target desc cannot be a generic method 2552 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2553 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2554 currentTarget = types.createErrorType(pt()); 2555 } 2556 return new TargetInfo(currentTarget, lambdaType); 2557 } 2558 2559 void preFlow(JCLambda tree) { 2560 new PostAttrAnalyzer() { 2561 @Override 2562 public void scan(JCTree tree) { 2563 if (tree == null || 2564 (tree.type != null && 2565 tree.type == Type.stuckType)) { 2566 //don't touch stuck expressions! 2567 return; 2568 } 2569 super.scan(tree); 2570 } 2571 }.scan(tree); 2572 } 2573 2574 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2575 2576 @Override 2577 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2578 return t.isIntersection() ? 2579 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2580 } 2581 2582 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2583 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2584 Type target = null; 2585 for (Type bound : ict.getExplicitComponents()) { 2586 TypeSymbol boundSym = bound.tsym; 2587 if (types.isFunctionalInterface(boundSym) && 2588 types.findDescriptorSymbol(boundSym) == desc) { 2589 target = bound; 2590 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2591 //bound must be an interface 2592 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2593 } 2594 } 2595 return target != null ? 2596 target : 2597 ict.getExplicitComponents().head; //error recovery 2598 } 2599 2600 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2601 ListBuffer<Type> targs = new ListBuffer<>(); 2602 ListBuffer<Type> supertypes = new ListBuffer<>(); 2603 for (Type i : ict.interfaces_field) { 2604 if (i.isParameterized()) { 2605 targs.appendList(i.tsym.type.allparams()); 2606 } 2607 supertypes.append(i.tsym.type); 2608 } 2609 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2610 notionalIntf.allparams_field = targs.toList(); 2611 notionalIntf.tsym.flags_field |= INTERFACE; 2612 return notionalIntf.tsym; 2613 } 2614 2615 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2616 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2617 diags.fragment(key, args))); 2618 } 2619 }; 2620 2621 private Type fallbackDescriptorType(JCExpression tree) { 2622 switch (tree.getTag()) { 2623 case LAMBDA: 2624 JCLambda lambda = (JCLambda)tree; 2625 List<Type> argtypes = List.nil(); 2626 for (JCVariableDecl param : lambda.params) { 2627 argtypes = param.vartype != null ? 2628 argtypes.append(param.vartype.type) : 2629 argtypes.append(syms.errType); 2630 } 2631 return new MethodType(argtypes, Type.recoveryType, 2632 List.of(syms.throwableType), syms.methodClass); 2633 case REFERENCE: 2634 return new MethodType(List.<Type>nil(), Type.recoveryType, 2635 List.of(syms.throwableType), syms.methodClass); 2636 default: 2637 Assert.error("Cannot get here!"); 2638 } 2639 return null; 2640 } 2641 2642 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2643 final InferenceContext inferenceContext, final Type... ts) { 2644 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2645 } 2646 2647 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2648 final InferenceContext inferenceContext, final List<Type> ts) { 2649 if (inferenceContext.free(ts)) { 2650 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() { 2651 @Override 2652 public void typesInferred(InferenceContext inferenceContext) { 2653 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts)); 2654 } 2655 }); 2656 } else { 2657 for (Type t : ts) { 2658 rs.checkAccessibleType(env, t); 2659 } 2660 } 2661 } 2662 2663 /** 2664 * Lambda/method reference have a special check context that ensures 2665 * that i.e. a lambda return type is compatible with the expected 2666 * type according to both the inherited context and the assignment 2667 * context. 2668 */ 2669 class FunctionalReturnContext extends Check.NestedCheckContext { 2670 2671 FunctionalReturnContext(CheckContext enclosingContext) { 2672 super(enclosingContext); 2673 } 2674 2675 @Override 2676 public boolean compatible(Type found, Type req, Warner warn) { 2677 //return type must be compatible in both current context and assignment context 2678 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn); 2679 } 2680 2681 @Override 2682 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2683 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2684 } 2685 } 2686 2687 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2688 2689 JCExpression expr; 2690 boolean expStmtExpected; 2691 2692 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2693 super(enclosingContext); 2694 this.expr = expr; 2695 } 2696 2697 @Override 2698 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2699 if (expStmtExpected) { 2700 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected)); 2701 } else { 2702 super.report(pos, details); 2703 } 2704 } 2705 2706 @Override 2707 public boolean compatible(Type found, Type req, Warner warn) { 2708 //a void return is compatible with an expression statement lambda 2709 if (req.hasTag(VOID)) { 2710 expStmtExpected = true; 2711 return TreeInfo.isExpressionStatement(expr); 2712 } else { 2713 return super.compatible(found, req, warn); 2714 } 2715 } 2716 } 2717 2718 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) { 2719 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2720 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2721 new FunctionalReturnContext(resultInfo.checkContext); 2722 2723 return descriptor.getReturnType() == Type.recoveryType ? 2724 recoveryInfo : 2725 new ResultInfo(KindSelector.VAL, 2726 descriptor.getReturnType(), funcContext); 2727 } 2728 2729 /** 2730 * Lambda compatibility. Check that given return types, thrown types, parameter types 2731 * are compatible with the expected functional interface descriptor. This means that: 2732 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2733 * types must be compatible with the return type of the expected descriptor. 2734 */ 2735 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2736 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2737 2738 //return values have already been checked - but if lambda has no return 2739 //values, we must ensure that void/value compatibility is correct; 2740 //this amounts at checking that, if a lambda body can complete normally, 2741 //the descriptor's return type must be void 2742 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2743 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2744 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2745 diags.fragment("missing.ret.val", returnType))); 2746 } 2747 2748 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2749 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2750 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2751 } 2752 } 2753 2754 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2755 * static field and that lambda has type annotations, these annotations will 2756 * also be stored at these fake clinit methods. 2757 * 2758 * LambdaToMethod also use fake clinit methods so they can be reused. 2759 * Also as LTM is a phase subsequent to attribution, the methods from 2760 * clinits can be safely removed by LTM to save memory. 2761 */ 2762 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2763 2764 public MethodSymbol removeClinit(ClassSymbol sym) { 2765 return clinits.remove(sym); 2766 } 2767 2768 /* This method returns an environment to be used to attribute a lambda 2769 * expression. 2770 * 2771 * The owner of this environment is a method symbol. If the current owner 2772 * is not a method, for example if the lambda is used to initialize 2773 * a field, then if the field is: 2774 * 2775 * - an instance field, we use the first constructor. 2776 * - a static field, we create a fake clinit method. 2777 */ 2778 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2779 Env<AttrContext> lambdaEnv; 2780 Symbol owner = env.info.scope.owner; 2781 if (owner.kind == VAR && owner.owner.kind == TYP) { 2782 //field initializer 2783 ClassSymbol enclClass = owner.enclClass(); 2784 Symbol newScopeOwner = env.info.scope.owner; 2785 /* if the field isn't static, then we can get the first constructor 2786 * and use it as the owner of the environment. This is what 2787 * LTM code is doing to look for type annotations so we are fine. 2788 */ 2789 if ((owner.flags() & STATIC) == 0) { 2790 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2791 newScopeOwner = s; 2792 break; 2793 } 2794 } else { 2795 /* if the field is static then we need to create a fake clinit 2796 * method, this method can later be reused by LTM. 2797 */ 2798 MethodSymbol clinit = clinits.get(enclClass); 2799 if (clinit == null) { 2800 Type clinitType = new MethodType(List.<Type>nil(), 2801 syms.voidType, List.<Type>nil(), syms.methodClass); 2802 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2803 names.clinit, clinitType, enclClass); 2804 clinit.params = List.<VarSymbol>nil(); 2805 clinits.put(enclClass, clinit); 2806 } 2807 newScopeOwner = clinit; 2808 } 2809 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2810 } else { 2811 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2812 } 2813 return lambdaEnv; 2814 } 2815 2816 @Override 2817 public void visitReference(final JCMemberReference that) { 2818 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2819 if (pt().hasTag(NONE)) { 2820 //method reference only allowed in assignment or method invocation/cast context 2821 log.error(that.pos(), "unexpected.mref"); 2822 } 2823 result = that.type = types.createErrorType(pt()); 2824 return; 2825 } 2826 final Env<AttrContext> localEnv = env.dup(that); 2827 try { 2828 //attribute member reference qualifier - if this is a constructor 2829 //reference, the expected kind must be a type 2830 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2831 2832 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2833 exprType = chk.checkConstructorRefType(that.expr, exprType); 2834 if (!exprType.isErroneous() && 2835 exprType.isRaw() && 2836 that.typeargs != null) { 2837 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2838 diags.fragment("mref.infer.and.explicit.params")); 2839 exprType = types.createErrorType(exprType); 2840 } 2841 } 2842 2843 if (exprType.isErroneous()) { 2844 //if the qualifier expression contains problems, 2845 //give up attribution of method reference 2846 result = that.type = exprType; 2847 return; 2848 } 2849 2850 if (TreeInfo.isStaticSelector(that.expr, names)) { 2851 //if the qualifier is a type, validate it; raw warning check is 2852 //omitted as we don't know at this stage as to whether this is a 2853 //raw selector (because of inference) 2854 chk.validate(that.expr, env, false); 2855 } else { 2856 Symbol lhsSym = TreeInfo.symbol(that.expr); 2857 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super; 2858 } 2859 //attrib type-arguments 2860 List<Type> typeargtypes = List.nil(); 2861 if (that.typeargs != null) { 2862 typeargtypes = attribTypes(that.typeargs, localEnv); 2863 } 2864 2865 boolean isTargetSerializable = 2866 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2867 isSerializable(pt()); 2868 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null); 2869 Type currentTarget = targetInfo.target; 2870 Type desc = targetInfo.descriptor; 2871 2872 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2873 List<Type> argtypes = desc.getParameterTypes(); 2874 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2875 2876 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2877 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2878 } 2879 2880 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2881 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2882 try { 2883 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2884 that.name, argtypes, typeargtypes, referenceCheck, 2885 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2886 } finally { 2887 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2888 } 2889 2890 Symbol refSym = refResult.fst; 2891 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2892 2893 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2894 * JDK-8075541 2895 */ 2896 if (refSym.kind != MTH) { 2897 boolean targetError; 2898 switch (refSym.kind) { 2899 case ABSENT_MTH: 2900 case MISSING_ENCL: 2901 targetError = false; 2902 break; 2903 case WRONG_MTH: 2904 case WRONG_MTHS: 2905 case AMBIGUOUS: 2906 case HIDDEN: 2907 case STATICERR: 2908 targetError = true; 2909 break; 2910 default: 2911 Assert.error("unexpected result kind " + refSym.kind); 2912 targetError = false; 2913 } 2914 2915 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2916 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2917 2918 JCDiagnostic.DiagnosticType diagKind = targetError ? 2919 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2920 2921 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2922 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2923 2924 if (targetError && currentTarget == Type.recoveryType) { 2925 //a target error doesn't make sense during recovery stage 2926 //as we don't know what actual parameter types are 2927 result = that.type = currentTarget; 2928 return; 2929 } else { 2930 if (targetError) { 2931 resultInfo.checkContext.report(that, diag); 2932 } else { 2933 log.report(diag); 2934 } 2935 result = that.type = types.createErrorType(currentTarget); 2936 return; 2937 } 2938 } 2939 2940 that.sym = refSym.baseSymbol(); 2941 that.kind = lookupHelper.referenceKind(that.sym); 2942 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2943 2944 if (desc.getReturnType() == Type.recoveryType) { 2945 // stop here 2946 result = that.type = currentTarget; 2947 return; 2948 } 2949 2950 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2951 2952 if (that.getMode() == ReferenceMode.INVOKE && 2953 TreeInfo.isStaticSelector(that.expr, names) && 2954 that.kind.isUnbound() && 2955 !desc.getParameterTypes().head.isParameterized()) { 2956 chk.checkRaw(that.expr, localEnv); 2957 } 2958 2959 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2960 exprType.getTypeArguments().nonEmpty()) { 2961 //static ref with class type-args 2962 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2963 diags.fragment("static.mref.with.targs")); 2964 result = that.type = types.createErrorType(currentTarget); 2965 return; 2966 } 2967 2968 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2969 // Check that super-qualified symbols are not abstract (JLS) 2970 rs.checkNonAbstract(that.pos(), that.sym); 2971 } 2972 2973 if (isTargetSerializable) { 2974 chk.checkElemAccessFromSerializableLambda(that); 2975 } 2976 } 2977 2978 ResultInfo checkInfo = 2979 resultInfo.dup(newMethodTemplate( 2980 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2981 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2982 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE); 2983 2984 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 2985 2986 if (that.kind.isUnbound() && 2987 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2988 //re-generate inference constraints for unbound receiver 2989 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 2990 //cannot happen as this has already been checked - we just need 2991 //to regenerate the inference constraints, as that has been lost 2992 //as a result of the call to inferenceContext.save() 2993 Assert.error("Can't get here"); 2994 } 2995 } 2996 2997 if (!refType.isErroneous()) { 2998 refType = types.createMethodTypeWithReturn(refType, 2999 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 3000 } 3001 3002 //go ahead with standard method reference compatibility check - note that param check 3003 //is a no-op (as this has been taken care during method applicability) 3004 boolean isSpeculativeRound = 3005 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 3006 3007 that.type = currentTarget; //avoids recovery at this stage 3008 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 3009 if (!isSpeculativeRound) { 3010 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 3011 } 3012 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 3013 } catch (Types.FunctionDescriptorLookupError ex) { 3014 JCDiagnostic cause = ex.getDiagnostic(); 3015 resultInfo.checkContext.report(that, cause); 3016 result = that.type = types.createErrorType(pt()); 3017 return; 3018 } 3019 } 3020 //where 3021 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 3022 //if this is a constructor reference, the expected kind must be a type 3023 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 3024 KindSelector.VAL_TYP : KindSelector.TYP, 3025 Type.noType); 3026 } 3027 3028 3029 @SuppressWarnings("fallthrough") 3030 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 3031 InferenceContext inferenceContext = checkContext.inferenceContext(); 3032 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 3033 3034 Type resType; 3035 switch (tree.getMode()) { 3036 case NEW: 3037 if (!tree.expr.type.isRaw()) { 3038 resType = tree.expr.type; 3039 break; 3040 } 3041 default: 3042 resType = refType.getReturnType(); 3043 } 3044 3045 Type incompatibleReturnType = resType; 3046 3047 if (returnType.hasTag(VOID)) { 3048 incompatibleReturnType = null; 3049 } 3050 3051 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 3052 if (resType.isErroneous() || 3053 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) { 3054 incompatibleReturnType = null; 3055 } 3056 } 3057 3058 if (incompatibleReturnType != null) { 3059 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 3060 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 3061 } else { 3062 if (inferenceContext.free(refType)) { 3063 // we need to wait for inference to finish and then replace inference vars in the referent type 3064 inferenceContext.addFreeTypeListener(List.of(refType), 3065 instantiatedContext -> { 3066 tree.referentType = instantiatedContext.asInstType(refType); 3067 }); 3068 } else { 3069 tree.referentType = refType; 3070 } 3071 } 3072 3073 if (!speculativeAttr) { 3074 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 3075 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 3076 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 3077 } 3078 } 3079 } 3080 3081 /** 3082 * Set functional type info on the underlying AST. Note: as the target descriptor 3083 * might contain inference variables, we might need to register an hook in the 3084 * current inference context. 3085 */ 3086 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 3087 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 3088 if (checkContext.inferenceContext().free(descriptorType)) { 3089 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() { 3090 public void typesInferred(InferenceContext inferenceContext) { 3091 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 3092 inferenceContext.asInstType(primaryTarget), checkContext); 3093 } 3094 }); 3095 } else { 3096 ListBuffer<Type> targets = new ListBuffer<>(); 3097 if (pt.hasTag(CLASS)) { 3098 if (pt.isCompound()) { 3099 targets.append(types.removeWildcards(primaryTarget)); //this goes first 3100 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 3101 if (t != primaryTarget) { 3102 targets.append(types.removeWildcards(t)); 3103 } 3104 } 3105 } else { 3106 targets.append(types.removeWildcards(primaryTarget)); 3107 } 3108 } 3109 fExpr.targets = targets.toList(); 3110 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 3111 pt != Type.recoveryType) { 3112 //check that functional interface class is well-formed 3113 try { 3114 /* Types.makeFunctionalInterfaceClass() may throw an exception 3115 * when it's executed post-inference. See the listener code 3116 * above. 3117 */ 3118 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 3119 names.empty, List.of(fExpr.targets.head), ABSTRACT); 3120 if (csym != null) { 3121 chk.checkImplementations(env.tree, csym, csym); 3122 try { 3123 //perform an additional functional interface check on the synthetic class, 3124 //as there may be spurious errors for raw targets - because of existing issues 3125 //with membership and inheritance (see JDK-8074570). 3126 csym.flags_field |= INTERFACE; 3127 types.findDescriptorType(csym.type); 3128 } catch (FunctionDescriptorLookupError err) { 3129 resultInfo.checkContext.report(fExpr, 3130 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 3131 } 3132 } 3133 } catch (Types.FunctionDescriptorLookupError ex) { 3134 JCDiagnostic cause = ex.getDiagnostic(); 3135 resultInfo.checkContext.report(env.tree, cause); 3136 } 3137 } 3138 } 3139 } 3140 3141 public void visitParens(JCParens tree) { 3142 Type owntype = attribTree(tree.expr, env, resultInfo); 3143 result = check(tree, owntype, pkind(), resultInfo); 3144 Symbol sym = TreeInfo.symbol(tree); 3145 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 3146 log.error(tree.pos(), "illegal.start.of.type"); 3147 } 3148 3149 public void visitAssign(JCAssign tree) { 3150 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 3151 Type capturedType = capture(owntype); 3152 attribExpr(tree.rhs, env, owntype); 3153 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3154 } 3155 3156 public void visitAssignop(JCAssignOp tree) { 3157 // Attribute arguments. 3158 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3159 Type operand = attribExpr(tree.rhs, env); 3160 // Find operator. 3161 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3162 if (operator != operators.noOpSymbol && 3163 !owntype.isErroneous() && 3164 !operand.isErroneous()) { 3165 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3166 chk.checkCastable(tree.rhs.pos(), 3167 operator.type.getReturnType(), 3168 owntype); 3169 } 3170 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3171 } 3172 3173 public void visitUnary(JCUnary tree) { 3174 // Attribute arguments. 3175 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3176 ? attribTree(tree.arg, env, varAssignmentInfo) 3177 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3178 3179 // Find operator. 3180 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3181 Type owntype = types.createErrorType(tree.type); 3182 if (operator != operators.noOpSymbol && 3183 !argtype.isErroneous()) { 3184 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3185 ? tree.arg.type 3186 : operator.type.getReturnType(); 3187 int opc = ((OperatorSymbol)operator).opcode; 3188 3189 // If the argument is constant, fold it. 3190 if (argtype.constValue() != null) { 3191 Type ctype = cfolder.fold1(opc, argtype); 3192 if (ctype != null) { 3193 owntype = cfolder.coerce(ctype, owntype); 3194 } 3195 } 3196 } 3197 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3198 } 3199 3200 public void visitBinary(JCBinary tree) { 3201 // Attribute arguments. 3202 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3203 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3204 // Find operator. 3205 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3206 Type owntype = types.createErrorType(tree.type); 3207 if (operator != operators.noOpSymbol && 3208 !left.isErroneous() && 3209 !right.isErroneous()) { 3210 owntype = operator.type.getReturnType(); 3211 int opc = ((OperatorSymbol)operator).opcode; 3212 // If both arguments are constants, fold them. 3213 if (left.constValue() != null && right.constValue() != null) { 3214 Type ctype = cfolder.fold2(opc, left, right); 3215 if (ctype != null) { 3216 owntype = cfolder.coerce(ctype, owntype); 3217 } 3218 } 3219 3220 // Check that argument types of a reference ==, != are 3221 // castable to each other, (JLS 15.21). Note: unboxing 3222 // comparisons will not have an acmp* opc at this point. 3223 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3224 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3225 log.error(tree.pos(), "incomparable.types", left, right); 3226 } 3227 } 3228 3229 chk.checkDivZero(tree.rhs.pos(), operator, right); 3230 } 3231 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3232 } 3233 3234 public void visitTypeCast(final JCTypeCast tree) { 3235 Type clazztype = attribType(tree.clazz, env); 3236 chk.validate(tree.clazz, env, false); 3237 //a fresh environment is required for 292 inference to work properly --- 3238 //see Infer.instantiatePolymorphicSignatureInstance() 3239 Env<AttrContext> localEnv = env.dup(tree); 3240 //should we propagate the target type? 3241 final ResultInfo castInfo; 3242 JCExpression expr = TreeInfo.skipParens(tree.expr); 3243 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3244 if (isPoly) { 3245 //expression is a poly - we need to propagate target type info 3246 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3247 new Check.NestedCheckContext(resultInfo.checkContext) { 3248 @Override 3249 public boolean compatible(Type found, Type req, Warner warn) { 3250 return types.isCastable(found, req, warn); 3251 } 3252 }); 3253 } else { 3254 //standalone cast - target-type info is not propagated 3255 castInfo = unknownExprInfo; 3256 } 3257 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3258 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3259 if (exprtype.constValue() != null) 3260 owntype = cfolder.coerce(exprtype, owntype); 3261 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3262 if (!isPoly) 3263 chk.checkRedundantCast(localEnv, tree); 3264 } 3265 3266 public void visitTypeTest(JCInstanceOf tree) { 3267 Type exprtype = chk.checkNullOrRefType( 3268 tree.expr.pos(), attribExpr(tree.expr, env)); 3269 Type clazztype = attribType(tree.clazz, env); 3270 if (!clazztype.hasTag(TYPEVAR)) { 3271 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3272 } 3273 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3274 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3275 clazztype = types.createErrorType(clazztype); 3276 } 3277 chk.validate(tree.clazz, env, false); 3278 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3279 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3280 } 3281 3282 public void visitIndexed(JCArrayAccess tree) { 3283 Type owntype = types.createErrorType(tree.type); 3284 Type atype = attribExpr(tree.indexed, env); 3285 attribExpr(tree.index, env, syms.intType); 3286 if (types.isArray(atype)) 3287 owntype = types.elemtype(atype); 3288 else if (!atype.hasTag(ERROR)) 3289 log.error(tree.pos(), "array.req.but.found", atype); 3290 if (!pkind().contains(KindSelector.VAL)) 3291 owntype = capture(owntype); 3292 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3293 } 3294 3295 public void visitIdent(JCIdent tree) { 3296 Symbol sym; 3297 3298 // Find symbol 3299 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3300 // If we are looking for a method, the prototype `pt' will be a 3301 // method type with the type of the call's arguments as parameters. 3302 env.info.pendingResolutionPhase = null; 3303 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3304 } else if (tree.sym != null && tree.sym.kind != VAR) { 3305 sym = tree.sym; 3306 } else { 3307 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3308 } 3309 tree.sym = sym; 3310 3311 // (1) Also find the environment current for the class where 3312 // sym is defined (`symEnv'). 3313 // Only for pre-tiger versions (1.4 and earlier): 3314 // (2) Also determine whether we access symbol out of an anonymous 3315 // class in a this or super call. This is illegal for instance 3316 // members since such classes don't carry a this$n link. 3317 // (`noOuterThisPath'). 3318 Env<AttrContext> symEnv = env; 3319 boolean noOuterThisPath = false; 3320 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3321 sym.kind.matches(KindSelector.VAL_MTH) && 3322 sym.owner.kind == TYP && 3323 tree.name != names._this && tree.name != names._super) { 3324 3325 // Find environment in which identifier is defined. 3326 while (symEnv.outer != null && 3327 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3328 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3329 noOuterThisPath = false; 3330 symEnv = symEnv.outer; 3331 } 3332 } 3333 3334 // If symbol is a variable, ... 3335 if (sym.kind == VAR) { 3336 VarSymbol v = (VarSymbol)sym; 3337 3338 // ..., evaluate its initializer, if it has one, and check for 3339 // illegal forward reference. 3340 checkInit(tree, env, v, false); 3341 3342 // If we are expecting a variable (as opposed to a value), check 3343 // that the variable is assignable in the current environment. 3344 if (KindSelector.ASG.subset(pkind())) 3345 checkAssignable(tree.pos(), v, null, env); 3346 } 3347 3348 // In a constructor body, 3349 // if symbol is a field or instance method, check that it is 3350 // not accessed before the supertype constructor is called. 3351 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3352 sym.kind.matches(KindSelector.VAL_MTH) && 3353 sym.owner.kind == TYP && 3354 (sym.flags() & STATIC) == 0) { 3355 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3356 sym : thisSym(tree.pos(), env)); 3357 } 3358 Env<AttrContext> env1 = env; 3359 if (sym.kind != ERR && sym.kind != TYP && 3360 sym.owner != null && sym.owner != env1.enclClass.sym) { 3361 // If the found symbol is inaccessible, then it is 3362 // accessed through an enclosing instance. Locate this 3363 // enclosing instance: 3364 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3365 env1 = env1.outer; 3366 } 3367 3368 if (env.info.isSerializable) { 3369 chk.checkElemAccessFromSerializableLambda(tree); 3370 } 3371 3372 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3373 } 3374 3375 public void visitSelect(JCFieldAccess tree) { 3376 // Determine the expected kind of the qualifier expression. 3377 KindSelector skind = KindSelector.NIL; 3378 if (tree.name == names._this || tree.name == names._super || 3379 tree.name == names._class) 3380 { 3381 skind = KindSelector.TYP; 3382 } else { 3383 if (pkind().contains(KindSelector.PCK)) 3384 skind = KindSelector.of(skind, KindSelector.PCK); 3385 if (pkind().contains(KindSelector.TYP)) 3386 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3387 if (pkind().contains(KindSelector.VAL_MTH)) 3388 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3389 } 3390 3391 // Attribute the qualifier expression, and determine its symbol (if any). 3392 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType)); 3393 if (!pkind().contains(KindSelector.TYP_PCK)) 3394 site = capture(site); // Capture field access 3395 3396 // don't allow T.class T[].class, etc 3397 if (skind == KindSelector.TYP) { 3398 Type elt = site; 3399 while (elt.hasTag(ARRAY)) 3400 elt = ((ArrayType)elt).elemtype; 3401 if (elt.hasTag(TYPEVAR)) { 3402 log.error(tree.pos(), "type.var.cant.be.deref"); 3403 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3404 tree.sym = tree.type.tsym; 3405 return ; 3406 } 3407 } 3408 3409 // If qualifier symbol is a type or `super', assert `selectSuper' 3410 // for the selection. This is relevant for determining whether 3411 // protected symbols are accessible. 3412 Symbol sitesym = TreeInfo.symbol(tree.selected); 3413 boolean selectSuperPrev = env.info.selectSuper; 3414 env.info.selectSuper = 3415 sitesym != null && 3416 sitesym.name == names._super; 3417 3418 // Determine the symbol represented by the selection. 3419 env.info.pendingResolutionPhase = null; 3420 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3421 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3422 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3423 sym = syms.errSymbol; 3424 } 3425 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3426 site = capture(site); 3427 sym = selectSym(tree, sitesym, site, env, resultInfo); 3428 } 3429 boolean varArgs = env.info.lastResolveVarargs(); 3430 tree.sym = sym; 3431 3432 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3433 site = types.skipTypeVars(site, true); 3434 } 3435 3436 // If that symbol is a variable, ... 3437 if (sym.kind == VAR) { 3438 VarSymbol v = (VarSymbol)sym; 3439 3440 // ..., evaluate its initializer, if it has one, and check for 3441 // illegal forward reference. 3442 checkInit(tree, env, v, true); 3443 3444 // If we are expecting a variable (as opposed to a value), check 3445 // that the variable is assignable in the current environment. 3446 if (KindSelector.ASG.subset(pkind())) 3447 checkAssignable(tree.pos(), v, tree.selected, env); 3448 } 3449 3450 if (sitesym != null && 3451 sitesym.kind == VAR && 3452 ((VarSymbol)sitesym).isResourceVariable() && 3453 sym.kind == MTH && 3454 sym.name.equals(names.close) && 3455 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3456 env.info.lint.isEnabled(LintCategory.TRY)) { 3457 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3458 } 3459 3460 // Disallow selecting a type from an expression 3461 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3462 tree.type = check(tree.selected, pt(), 3463 sitesym == null ? 3464 KindSelector.VAL : sitesym.kind.toSelector(), 3465 new ResultInfo(KindSelector.TYP_PCK, pt())); 3466 } 3467 3468 if (isType(sitesym)) { 3469 if (sym.name == names._this) { 3470 // If `C' is the currently compiled class, check that 3471 // C.this' does not appear in a call to a super(...) 3472 if (env.info.isSelfCall && 3473 site.tsym == env.enclClass.sym) { 3474 chk.earlyRefError(tree.pos(), sym); 3475 } 3476 } else { 3477 // Check if type-qualified fields or methods are static (JLS) 3478 if ((sym.flags() & STATIC) == 0 && 3479 sym.name != names._super && 3480 (sym.kind == VAR || sym.kind == MTH)) { 3481 rs.accessBase(rs.new StaticError(sym), 3482 tree.pos(), site, sym.name, true); 3483 } 3484 } 3485 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3486 sym.isStatic() && sym.kind == MTH) { 3487 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3488 } 3489 } else if (sym.kind != ERR && 3490 (sym.flags() & STATIC) != 0 && 3491 sym.name != names._class) { 3492 // If the qualified item is not a type and the selected item is static, report 3493 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3494 chk.warnStatic(tree, "static.not.qualified.by.type", 3495 sym.kind.kindName(), sym.owner); 3496 } 3497 3498 // If we are selecting an instance member via a `super', ... 3499 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3500 3501 // Check that super-qualified symbols are not abstract (JLS) 3502 rs.checkNonAbstract(tree.pos(), sym); 3503 3504 if (site.isRaw()) { 3505 // Determine argument types for site. 3506 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3507 if (site1 != null) site = site1; 3508 } 3509 } 3510 3511 if (env.info.isSerializable) { 3512 chk.checkElemAccessFromSerializableLambda(tree); 3513 } 3514 3515 env.info.selectSuper = selectSuperPrev; 3516 result = checkId(tree, site, sym, env, resultInfo); 3517 } 3518 //where 3519 /** Determine symbol referenced by a Select expression, 3520 * 3521 * @param tree The select tree. 3522 * @param site The type of the selected expression, 3523 * @param env The current environment. 3524 * @param resultInfo The current result. 3525 */ 3526 private Symbol selectSym(JCFieldAccess tree, 3527 Symbol location, 3528 Type site, 3529 Env<AttrContext> env, 3530 ResultInfo resultInfo) { 3531 DiagnosticPosition pos = tree.pos(); 3532 Name name = tree.name; 3533 switch (site.getTag()) { 3534 case PACKAGE: 3535 return rs.accessBase( 3536 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3537 pos, location, site, name, true); 3538 case ARRAY: 3539 case CLASS: 3540 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3541 return rs.resolveQualifiedMethod( 3542 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3543 } else if (name == names._this || name == names._super) { 3544 return rs.resolveSelf(pos, env, site.tsym, name); 3545 } else if (name == names._class) { 3546 // In this case, we have already made sure in 3547 // visitSelect that qualifier expression is a type. 3548 Type t = syms.classType; 3549 List<Type> typeargs = List.of(types.erasure(site)); 3550 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3551 return new VarSymbol( 3552 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3553 } else { 3554 // We are seeing a plain identifier as selector. 3555 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3556 sym = rs.accessBase(sym, pos, location, site, name, true); 3557 return sym; 3558 } 3559 case WILDCARD: 3560 throw new AssertionError(tree); 3561 case TYPEVAR: 3562 // Normally, site.getUpperBound() shouldn't be null. 3563 // It should only happen during memberEnter/attribBase 3564 // when determining the super type which *must* beac 3565 // done before attributing the type variables. In 3566 // other words, we are seeing this illegal program: 3567 // class B<T> extends A<T.foo> {} 3568 Symbol sym = (site.getUpperBound() != null) 3569 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3570 : null; 3571 if (sym == null) { 3572 log.error(pos, "type.var.cant.be.deref"); 3573 return syms.errSymbol; 3574 } else { 3575 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3576 rs.new AccessError(env, site, sym) : 3577 sym; 3578 rs.accessBase(sym2, pos, location, site, name, true); 3579 return sym; 3580 } 3581 case ERROR: 3582 // preserve identifier names through errors 3583 return types.createErrorType(name, site.tsym, site).tsym; 3584 default: 3585 // The qualifier expression is of a primitive type -- only 3586 // .class is allowed for these. 3587 if (name == names._class) { 3588 // In this case, we have already made sure in Select that 3589 // qualifier expression is a type. 3590 Type t = syms.classType; 3591 Type arg = types.boxedClass(site).type; 3592 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3593 return new VarSymbol( 3594 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3595 } else { 3596 log.error(pos, "cant.deref", site); 3597 return syms.errSymbol; 3598 } 3599 } 3600 } 3601 3602 /** Determine type of identifier or select expression and check that 3603 * (1) the referenced symbol is not deprecated 3604 * (2) the symbol's type is safe (@see checkSafe) 3605 * (3) if symbol is a variable, check that its type and kind are 3606 * compatible with the prototype and protokind. 3607 * (4) if symbol is an instance field of a raw type, 3608 * which is being assigned to, issue an unchecked warning if its 3609 * type changes under erasure. 3610 * (5) if symbol is an instance method of a raw type, issue an 3611 * unchecked warning if its argument types change under erasure. 3612 * If checks succeed: 3613 * If symbol is a constant, return its constant type 3614 * else if symbol is a method, return its result type 3615 * otherwise return its type. 3616 * Otherwise return errType. 3617 * 3618 * @param tree The syntax tree representing the identifier 3619 * @param site If this is a select, the type of the selected 3620 * expression, otherwise the type of the current class. 3621 * @param sym The symbol representing the identifier. 3622 * @param env The current environment. 3623 * @param resultInfo The expected result 3624 */ 3625 Type checkId(JCTree tree, 3626 Type site, 3627 Symbol sym, 3628 Env<AttrContext> env, 3629 ResultInfo resultInfo) { 3630 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3631 checkMethodId(tree, site, sym, env, resultInfo) : 3632 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3633 } 3634 3635 Type checkMethodId(JCTree tree, 3636 Type site, 3637 Symbol sym, 3638 Env<AttrContext> env, 3639 ResultInfo resultInfo) { 3640 boolean isPolymorhicSignature = 3641 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3642 return isPolymorhicSignature ? 3643 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3644 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3645 } 3646 3647 Type checkSigPolyMethodId(JCTree tree, 3648 Type site, 3649 Symbol sym, 3650 Env<AttrContext> env, 3651 ResultInfo resultInfo) { 3652 //recover original symbol for signature polymorphic methods 3653 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3654 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3655 return sym.type; 3656 } 3657 3658 Type checkMethodIdInternal(JCTree tree, 3659 Type site, 3660 Symbol sym, 3661 Env<AttrContext> env, 3662 ResultInfo resultInfo) { 3663 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3664 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3665 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3666 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3667 return owntype; 3668 } else { 3669 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3670 } 3671 } 3672 3673 Type checkIdInternal(JCTree tree, 3674 Type site, 3675 Symbol sym, 3676 Type pt, 3677 Env<AttrContext> env, 3678 ResultInfo resultInfo) { 3679 if (pt.isErroneous()) { 3680 return types.createErrorType(site); 3681 } 3682 Type owntype; // The computed type of this identifier occurrence. 3683 switch (sym.kind) { 3684 case TYP: 3685 // For types, the computed type equals the symbol's type, 3686 // except for two situations: 3687 owntype = sym.type; 3688 if (owntype.hasTag(CLASS)) { 3689 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3690 Type ownOuter = owntype.getEnclosingType(); 3691 3692 // (a) If the symbol's type is parameterized, erase it 3693 // because no type parameters were given. 3694 // We recover generic outer type later in visitTypeApply. 3695 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3696 owntype = types.erasure(owntype); 3697 } 3698 3699 // (b) If the symbol's type is an inner class, then 3700 // we have to interpret its outer type as a superclass 3701 // of the site type. Example: 3702 // 3703 // class Tree<A> { class Visitor { ... } } 3704 // class PointTree extends Tree<Point> { ... } 3705 // ...PointTree.Visitor... 3706 // 3707 // Then the type of the last expression above is 3708 // Tree<Point>.Visitor. 3709 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3710 Type normOuter = site; 3711 if (normOuter.hasTag(CLASS)) { 3712 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3713 } 3714 if (normOuter == null) // perhaps from an import 3715 normOuter = types.erasure(ownOuter); 3716 if (normOuter != ownOuter) 3717 owntype = new ClassType( 3718 normOuter, List.<Type>nil(), owntype.tsym, 3719 owntype.getMetadata()); 3720 } 3721 } 3722 break; 3723 case VAR: 3724 VarSymbol v = (VarSymbol)sym; 3725 // Test (4): if symbol is an instance field of a raw type, 3726 // which is being assigned to, issue an unchecked warning if 3727 // its type changes under erasure. 3728 if (KindSelector.ASG.subset(pkind()) && 3729 v.owner.kind == TYP && 3730 (v.flags() & STATIC) == 0 && 3731 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3732 Type s = types.asOuterSuper(site, v.owner); 3733 if (s != null && 3734 s.isRaw() && 3735 !types.isSameType(v.type, v.erasure(types))) { 3736 chk.warnUnchecked(tree.pos(), 3737 "unchecked.assign.to.var", 3738 v, s); 3739 } 3740 } 3741 // The computed type of a variable is the type of the 3742 // variable symbol, taken as a member of the site type. 3743 owntype = (sym.owner.kind == TYP && 3744 sym.name != names._this && sym.name != names._super) 3745 ? types.memberType(site, sym) 3746 : sym.type; 3747 3748 // If the variable is a constant, record constant value in 3749 // computed type. 3750 if (v.getConstValue() != null && isStaticReference(tree)) 3751 owntype = owntype.constType(v.getConstValue()); 3752 3753 if (resultInfo.pkind == KindSelector.VAL) { 3754 owntype = capture(owntype); // capture "names as expressions" 3755 } 3756 break; 3757 case MTH: { 3758 owntype = checkMethod(site, sym, 3759 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3760 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3761 resultInfo.pt.getTypeArguments()); 3762 break; 3763 } 3764 case PCK: case ERR: 3765 owntype = sym.type; 3766 break; 3767 default: 3768 throw new AssertionError("unexpected kind: " + sym.kind + 3769 " in tree " + tree); 3770 } 3771 3772 // Emit a `deprecation' warning if symbol is deprecated. 3773 // (for constructors (but not for constructor references), the error 3774 // was given when the constructor was resolved) 3775 3776 if (sym.name != names.init || tree.hasTag(REFERENCE)) { 3777 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3778 chk.checkSunAPI(tree.pos(), sym); 3779 chk.checkProfile(tree.pos(), sym); 3780 } 3781 3782 // If symbol is a variable, check that its type and 3783 // kind are compatible with the prototype and protokind. 3784 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3785 } 3786 3787 /** Check that variable is initialized and evaluate the variable's 3788 * initializer, if not yet done. Also check that variable is not 3789 * referenced before it is defined. 3790 * @param tree The tree making up the variable reference. 3791 * @param env The current environment. 3792 * @param v The variable's symbol. 3793 */ 3794 private void checkInit(JCTree tree, 3795 Env<AttrContext> env, 3796 VarSymbol v, 3797 boolean onlyWarning) { 3798 // A forward reference is diagnosed if the declaration position 3799 // of the variable is greater than the current tree position 3800 // and the tree and variable definition occur in the same class 3801 // definition. Note that writes don't count as references. 3802 // This check applies only to class and instance 3803 // variables. Local variables follow different scope rules, 3804 // and are subject to definite assignment checking. 3805 Env<AttrContext> initEnv = enclosingInitEnv(env); 3806 if (initEnv != null && 3807 (initEnv.info.enclVar == v || v.pos > tree.pos) && 3808 v.owner.kind == TYP && 3809 v.owner == env.info.scope.owner.enclClass() && 3810 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3811 (!env.tree.hasTag(ASSIGN) || 3812 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3813 String suffix = (initEnv.info.enclVar == v) ? 3814 "self.ref" : "forward.ref"; 3815 if (!onlyWarning || isStaticEnumField(v)) { 3816 log.error(tree.pos(), "illegal." + suffix); 3817 } else if (useBeforeDeclarationWarning) { 3818 log.warning(tree.pos(), suffix, v); 3819 } 3820 } 3821 3822 v.getConstValue(); // ensure initializer is evaluated 3823 3824 checkEnumInitializer(tree, env, v); 3825 } 3826 3827 /** 3828 * Returns the enclosing init environment associated with this env (if any). An init env 3829 * can be either a field declaration env or a static/instance initializer env. 3830 */ 3831 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3832 while (true) { 3833 switch (env.tree.getTag()) { 3834 case VARDEF: 3835 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3836 if (vdecl.sym.owner.kind == TYP) { 3837 //field 3838 return env; 3839 } 3840 break; 3841 case BLOCK: 3842 if (env.next.tree.hasTag(CLASSDEF)) { 3843 //instance/static initializer 3844 return env; 3845 } 3846 break; 3847 case METHODDEF: 3848 case CLASSDEF: 3849 case TOPLEVEL: 3850 return null; 3851 } 3852 Assert.checkNonNull(env.next); 3853 env = env.next; 3854 } 3855 } 3856 3857 /** 3858 * Check for illegal references to static members of enum. In 3859 * an enum type, constructors and initializers may not 3860 * reference its static members unless they are constant. 3861 * 3862 * @param tree The tree making up the variable reference. 3863 * @param env The current environment. 3864 * @param v The variable's symbol. 3865 * @jls section 8.9 Enums 3866 */ 3867 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3868 // JLS: 3869 // 3870 // "It is a compile-time error to reference a static field 3871 // of an enum type that is not a compile-time constant 3872 // (15.28) from constructors, instance initializer blocks, 3873 // or instance variable initializer expressions of that 3874 // type. It is a compile-time error for the constructors, 3875 // instance initializer blocks, or instance variable 3876 // initializer expressions of an enum constant e to refer 3877 // to itself or to an enum constant of the same type that 3878 // is declared to the right of e." 3879 if (isStaticEnumField(v)) { 3880 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3881 3882 if (enclClass == null || enclClass.owner == null) 3883 return; 3884 3885 // See if the enclosing class is the enum (or a 3886 // subclass thereof) declaring v. If not, this 3887 // reference is OK. 3888 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3889 return; 3890 3891 // If the reference isn't from an initializer, then 3892 // the reference is OK. 3893 if (!Resolve.isInitializer(env)) 3894 return; 3895 3896 log.error(tree.pos(), "illegal.enum.static.ref"); 3897 } 3898 } 3899 3900 /** Is the given symbol a static, non-constant field of an Enum? 3901 * Note: enum literals should not be regarded as such 3902 */ 3903 private boolean isStaticEnumField(VarSymbol v) { 3904 return Flags.isEnum(v.owner) && 3905 Flags.isStatic(v) && 3906 !Flags.isConstant(v) && 3907 v.name != names._class; 3908 } 3909 3910 /** 3911 * Check that method arguments conform to its instantiation. 3912 **/ 3913 public Type checkMethod(Type site, 3914 final Symbol sym, 3915 ResultInfo resultInfo, 3916 Env<AttrContext> env, 3917 final List<JCExpression> argtrees, 3918 List<Type> argtypes, 3919 List<Type> typeargtypes) { 3920 // Test (5): if symbol is an instance method of a raw type, issue 3921 // an unchecked warning if its argument types change under erasure. 3922 if ((sym.flags() & STATIC) == 0 && 3923 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3924 Type s = types.asOuterSuper(site, sym.owner); 3925 if (s != null && s.isRaw() && 3926 !types.isSameTypes(sym.type.getParameterTypes(), 3927 sym.erasure(types).getParameterTypes())) { 3928 chk.warnUnchecked(env.tree.pos(), 3929 "unchecked.call.mbr.of.raw.type", 3930 sym, s); 3931 } 3932 } 3933 3934 if (env.info.defaultSuperCallSite != null) { 3935 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3936 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3937 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3938 List<MethodSymbol> icand_sup = 3939 types.interfaceCandidates(sup, (MethodSymbol)sym); 3940 if (icand_sup.nonEmpty() && 3941 icand_sup.head != sym && 3942 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3943 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3944 diags.fragment("overridden.default", sym, sup)); 3945 break; 3946 } 3947 } 3948 env.info.defaultSuperCallSite = null; 3949 } 3950 3951 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3952 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3953 if (app.meth.hasTag(SELECT) && 3954 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3955 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3956 } 3957 } 3958 3959 // Compute the identifier's instantiated type. 3960 // For methods, we need to compute the instance type by 3961 // Resolve.instantiate from the symbol's type as well as 3962 // any type arguments and value arguments. 3963 Warner noteWarner = new Warner(); 3964 try { 3965 Type owntype = rs.checkMethod( 3966 env, 3967 site, 3968 sym, 3969 resultInfo, 3970 argtypes, 3971 typeargtypes, 3972 noteWarner); 3973 3974 DeferredAttr.DeferredTypeMap checkDeferredMap = 3975 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3976 3977 argtypes = argtypes.map(checkDeferredMap); 3978 3979 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3980 chk.warnUnchecked(env.tree.pos(), 3981 "unchecked.meth.invocation.applied", 3982 kindName(sym), 3983 sym.name, 3984 rs.methodArguments(sym.type.getParameterTypes()), 3985 rs.methodArguments(argtypes.map(checkDeferredMap)), 3986 kindName(sym.location()), 3987 sym.location()); 3988 owntype = new MethodType(owntype.getParameterTypes(), 3989 types.erasure(owntype.getReturnType()), 3990 types.erasure(owntype.getThrownTypes()), 3991 syms.methodClass); 3992 } 3993 3994 PolyKind pkind = (sym.type.hasTag(FORALL) && 3995 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ? 3996 PolyKind.POLY : PolyKind.STANDALONE; 3997 TreeInfo.setPolyKind(env.tree, pkind); 3998 3999 return (resultInfo.pt == Infer.anyPoly) ? 4000 owntype : 4001 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 4002 resultInfo.checkContext.inferenceContext()); 4003 } catch (Infer.InferenceException ex) { 4004 //invalid target type - propagate exception outwards or report error 4005 //depending on the current check context 4006 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 4007 return types.createErrorType(site); 4008 } catch (Resolve.InapplicableMethodException ex) { 4009 final JCDiagnostic diag = ex.getDiagnostic(); 4010 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 4011 @Override 4012 protected Pair<Symbol, JCDiagnostic> errCandidate() { 4013 return new Pair<>(sym, diag); 4014 } 4015 }; 4016 List<Type> argtypes2 = argtypes.map( 4017 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 4018 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 4019 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 4020 log.report(errDiag); 4021 return types.createErrorType(site); 4022 } 4023 } 4024 4025 public void visitLiteral(JCLiteral tree) { 4026 result = check(tree, litType(tree.typetag).constType(tree.value), 4027 KindSelector.VAL, resultInfo); 4028 } 4029 //where 4030 /** Return the type of a literal with given type tag. 4031 */ 4032 Type litType(TypeTag tag) { 4033 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 4034 } 4035 4036 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 4037 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 4038 } 4039 4040 public void visitTypeArray(JCArrayTypeTree tree) { 4041 Type etype = attribType(tree.elemtype, env); 4042 Type type = new ArrayType(etype, syms.arrayClass); 4043 result = check(tree, type, KindSelector.TYP, resultInfo); 4044 } 4045 4046 /** Visitor method for parameterized types. 4047 * Bound checking is left until later, since types are attributed 4048 * before supertype structure is completely known 4049 */ 4050 public void visitTypeApply(JCTypeApply tree) { 4051 Type owntype = types.createErrorType(tree.type); 4052 4053 // Attribute functor part of application and make sure it's a class. 4054 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 4055 4056 // Attribute type parameters 4057 List<Type> actuals = attribTypes(tree.arguments, env); 4058 4059 if (clazztype.hasTag(CLASS)) { 4060 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 4061 if (actuals.isEmpty()) //diamond 4062 actuals = formals; 4063 4064 if (actuals.length() == formals.length()) { 4065 List<Type> a = actuals; 4066 List<Type> f = formals; 4067 while (a.nonEmpty()) { 4068 a.head = a.head.withTypeVar(f.head); 4069 a = a.tail; 4070 f = f.tail; 4071 } 4072 // Compute the proper generic outer 4073 Type clazzOuter = clazztype.getEnclosingType(); 4074 if (clazzOuter.hasTag(CLASS)) { 4075 Type site; 4076 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 4077 if (clazz.hasTag(IDENT)) { 4078 site = env.enclClass.sym.type; 4079 } else if (clazz.hasTag(SELECT)) { 4080 site = ((JCFieldAccess) clazz).selected.type; 4081 } else throw new AssertionError(""+tree); 4082 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 4083 if (site.hasTag(CLASS)) 4084 site = types.asOuterSuper(site, clazzOuter.tsym); 4085 if (site == null) 4086 site = types.erasure(clazzOuter); 4087 clazzOuter = site; 4088 } 4089 } 4090 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 4091 clazztype.getMetadata()); 4092 } else { 4093 if (formals.length() != 0) { 4094 log.error(tree.pos(), "wrong.number.type.args", 4095 Integer.toString(formals.length())); 4096 } else { 4097 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 4098 } 4099 owntype = types.createErrorType(tree.type); 4100 } 4101 } 4102 result = check(tree, owntype, KindSelector.TYP, resultInfo); 4103 } 4104 4105 public void visitTypeUnion(JCTypeUnion tree) { 4106 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 4107 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 4108 for (JCExpression typeTree : tree.alternatives) { 4109 Type ctype = attribType(typeTree, env); 4110 ctype = chk.checkType(typeTree.pos(), 4111 chk.checkClassType(typeTree.pos(), ctype), 4112 syms.throwableType); 4113 if (!ctype.isErroneous()) { 4114 //check that alternatives of a union type are pairwise 4115 //unrelated w.r.t. subtyping 4116 if (chk.intersects(ctype, multicatchTypes.toList())) { 4117 for (Type t : multicatchTypes) { 4118 boolean sub = types.isSubtype(ctype, t); 4119 boolean sup = types.isSubtype(t, ctype); 4120 if (sub || sup) { 4121 //assume 'a' <: 'b' 4122 Type a = sub ? ctype : t; 4123 Type b = sub ? t : ctype; 4124 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 4125 } 4126 } 4127 } 4128 multicatchTypes.append(ctype); 4129 if (all_multicatchTypes != null) 4130 all_multicatchTypes.append(ctype); 4131 } else { 4132 if (all_multicatchTypes == null) { 4133 all_multicatchTypes = new ListBuffer<>(); 4134 all_multicatchTypes.appendList(multicatchTypes); 4135 } 4136 all_multicatchTypes.append(ctype); 4137 } 4138 } 4139 Type t = check(tree, types.lub(multicatchTypes.toList()), 4140 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE)); 4141 if (t.hasTag(CLASS)) { 4142 List<Type> alternatives = 4143 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 4144 t = new UnionClassType((ClassType) t, alternatives); 4145 } 4146 tree.type = result = t; 4147 } 4148 4149 public void visitTypeIntersection(JCTypeIntersection tree) { 4150 attribTypes(tree.bounds, env); 4151 tree.type = result = checkIntersection(tree, tree.bounds); 4152 } 4153 4154 public void visitTypeParameter(JCTypeParameter tree) { 4155 TypeVar typeVar = (TypeVar) tree.type; 4156 4157 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4158 annotate.annotateTypeParameterSecondStage(tree, tree.annotations); 4159 } 4160 4161 if (!typeVar.bound.isErroneous()) { 4162 //fixup type-parameter bound computed in 'attribTypeVariables' 4163 typeVar.bound = checkIntersection(tree, tree.bounds); 4164 } 4165 } 4166 4167 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4168 Set<Type> boundSet = new HashSet<>(); 4169 if (bounds.nonEmpty()) { 4170 // accept class or interface or typevar as first bound. 4171 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4172 boundSet.add(types.erasure(bounds.head.type)); 4173 if (bounds.head.type.isErroneous()) { 4174 return bounds.head.type; 4175 } 4176 else if (bounds.head.type.hasTag(TYPEVAR)) { 4177 // if first bound was a typevar, do not accept further bounds. 4178 if (bounds.tail.nonEmpty()) { 4179 log.error(bounds.tail.head.pos(), 4180 "type.var.may.not.be.followed.by.other.bounds"); 4181 return bounds.head.type; 4182 } 4183 } else { 4184 // if first bound was a class or interface, accept only interfaces 4185 // as further bounds. 4186 for (JCExpression bound : bounds.tail) { 4187 bound.type = checkBase(bound.type, bound, env, false, true, false); 4188 if (bound.type.isErroneous()) { 4189 bounds = List.of(bound); 4190 } 4191 else if (bound.type.hasTag(CLASS)) { 4192 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4193 } 4194 } 4195 } 4196 } 4197 4198 if (bounds.length() == 0) { 4199 return syms.objectType; 4200 } else if (bounds.length() == 1) { 4201 return bounds.head.type; 4202 } else { 4203 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4204 // ... the variable's bound is a class type flagged COMPOUND 4205 // (see comment for TypeVar.bound). 4206 // In this case, generate a class tree that represents the 4207 // bound class, ... 4208 JCExpression extending; 4209 List<JCExpression> implementing; 4210 if (!bounds.head.type.isInterface()) { 4211 extending = bounds.head; 4212 implementing = bounds.tail; 4213 } else { 4214 extending = null; 4215 implementing = bounds; 4216 } 4217 JCClassDecl cd = make.at(tree).ClassDef( 4218 make.Modifiers(PUBLIC | ABSTRACT), 4219 names.empty, List.<JCTypeParameter>nil(), 4220 extending, implementing, List.<JCTree>nil()); 4221 4222 ClassSymbol c = (ClassSymbol)owntype.tsym; 4223 Assert.check((c.flags() & COMPOUND) != 0); 4224 cd.sym = c; 4225 c.sourcefile = env.toplevel.sourcefile; 4226 4227 // ... and attribute the bound class 4228 c.flags_field |= UNATTRIBUTED; 4229 Env<AttrContext> cenv = enter.classEnv(cd, env); 4230 typeEnvs.put(c, cenv); 4231 attribClass(c); 4232 return owntype; 4233 } 4234 } 4235 4236 public void visitWildcard(JCWildcard tree) { 4237 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4238 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4239 ? syms.objectType 4240 : attribType(tree.inner, env); 4241 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4242 tree.kind.kind, 4243 syms.boundClass), 4244 KindSelector.TYP, resultInfo); 4245 } 4246 4247 public void visitAnnotation(JCAnnotation tree) { 4248 Assert.error("should be handled in annotate"); 4249 } 4250 4251 public void visitAnnotatedType(JCAnnotatedType tree) { 4252 attribAnnotationTypes(tree.annotations, env); 4253 Type underlyingType = attribType(tree.underlyingType, env); 4254 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET); 4255 4256 if (!env.info.isNewClass) 4257 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType); 4258 result = tree.type = annotatedType; 4259 } 4260 4261 public void visitErroneous(JCErroneous tree) { 4262 if (tree.errs != null) 4263 for (JCTree err : tree.errs) 4264 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4265 result = tree.type = syms.errType; 4266 } 4267 4268 /** Default visitor method for all other trees. 4269 */ 4270 public void visitTree(JCTree tree) { 4271 throw new AssertionError(); 4272 } 4273 4274 /** 4275 * Attribute an env for either a top level tree or class or module declaration. 4276 */ 4277 public void attrib(Env<AttrContext> env) { 4278 switch (env.tree.getTag()) { 4279 case MODULEDEF: 4280 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym); 4281 break; 4282 case TOPLEVEL: 4283 attribTopLevel(env); 4284 break; 4285 default: 4286 attribClass(env.tree.pos(), env.enclClass.sym); 4287 } 4288 } 4289 4290 /** 4291 * Attribute a top level tree. These trees are encountered when the 4292 * package declaration has annotations. 4293 */ 4294 public void attribTopLevel(Env<AttrContext> env) { 4295 JCCompilationUnit toplevel = env.toplevel; 4296 try { 4297 annotate.flush(); 4298 } catch (CompletionFailure ex) { 4299 chk.completionError(toplevel.pos(), ex); 4300 } 4301 } 4302 4303 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) { 4304 try { 4305 annotate.flush(); 4306 attribModule(m); 4307 } catch (CompletionFailure ex) { 4308 chk.completionError(pos, ex); 4309 } 4310 } 4311 4312 void attribModule(ModuleSymbol m) { 4313 // Get environment current at the point of module definition. 4314 Env<AttrContext> env = enter.typeEnvs.get(m); 4315 attribStat(env.tree, env); 4316 } 4317 4318 /** Main method: attribute class definition associated with given class symbol. 4319 * reporting completion failures at the given position. 4320 * @param pos The source position at which completion errors are to be 4321 * reported. 4322 * @param c The class symbol whose definition will be attributed. 4323 */ 4324 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4325 try { 4326 annotate.flush(); 4327 attribClass(c); 4328 } catch (CompletionFailure ex) { 4329 chk.completionError(pos, ex); 4330 } 4331 } 4332 4333 /** Attribute class definition associated with given class symbol. 4334 * @param c The class symbol whose definition will be attributed. 4335 */ 4336 void attribClass(ClassSymbol c) throws CompletionFailure { 4337 if (c.type.hasTag(ERROR)) return; 4338 4339 // Check for cycles in the inheritance graph, which can arise from 4340 // ill-formed class files. 4341 chk.checkNonCyclic(null, c.type); 4342 4343 Type st = types.supertype(c.type); 4344 if ((c.flags_field & Flags.COMPOUND) == 0) { 4345 // First, attribute superclass. 4346 if (st.hasTag(CLASS)) 4347 attribClass((ClassSymbol)st.tsym); 4348 4349 // Next attribute owner, if it is a class. 4350 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4351 attribClass((ClassSymbol)c.owner); 4352 } 4353 4354 // The previous operations might have attributed the current class 4355 // if there was a cycle. So we test first whether the class is still 4356 // UNATTRIBUTED. 4357 if ((c.flags_field & UNATTRIBUTED) != 0) { 4358 c.flags_field &= ~UNATTRIBUTED; 4359 4360 // Get environment current at the point of class definition. 4361 Env<AttrContext> env = typeEnvs.get(c); 4362 4363 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4364 // because the annotations were not available at the time the env was created. Therefore, 4365 // we look up the environment chain for the first enclosing environment for which the 4366 // lint value is set. Typically, this is the parent env, but might be further if there 4367 // are any envs created as a result of TypeParameter nodes. 4368 Env<AttrContext> lintEnv = env; 4369 while (lintEnv.info.lint == null) 4370 lintEnv = lintEnv.next; 4371 4372 // Having found the enclosing lint value, we can initialize the lint value for this class 4373 env.info.lint = lintEnv.info.lint.augment(c); 4374 4375 Lint prevLint = chk.setLint(env.info.lint); 4376 JavaFileObject prev = log.useSource(c.sourcefile); 4377 ResultInfo prevReturnRes = env.info.returnResult; 4378 4379 try { 4380 deferredLintHandler.flush(env.tree); 4381 env.info.returnResult = null; 4382 // java.lang.Enum may not be subclassed by a non-enum 4383 if (st.tsym == syms.enumSym && 4384 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4385 log.error(env.tree.pos(), "enum.no.subclassing"); 4386 4387 // Enums may not be extended by source-level classes 4388 if (st.tsym != null && 4389 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4390 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4391 log.error(env.tree.pos(), "enum.types.not.extensible"); 4392 } 4393 4394 if (isSerializable(c.type)) { 4395 env.info.isSerializable = true; 4396 } 4397 4398 attribClassBody(env, c); 4399 4400 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4401 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4402 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4403 } finally { 4404 env.info.returnResult = prevReturnRes; 4405 log.useSource(prev); 4406 chk.setLint(prevLint); 4407 } 4408 4409 } 4410 } 4411 4412 public void visitImport(JCImport tree) { 4413 // nothing to do 4414 } 4415 4416 public void visitModuleDef(JCModuleDecl tree) { 4417 tree.sym.completeUsesProvides(); 4418 } 4419 4420 /** Finish the attribution of a class. */ 4421 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4422 JCClassDecl tree = (JCClassDecl)env.tree; 4423 Assert.check(c == tree.sym); 4424 4425 // Validate type parameters, supertype and interfaces. 4426 attribStats(tree.typarams, env); 4427 if (!c.isAnonymous()) { 4428 //already checked if anonymous 4429 chk.validate(tree.typarams, env); 4430 chk.validate(tree.extending, env); 4431 chk.validate(tree.implementing, env); 4432 } 4433 4434 c.markAbstractIfNeeded(types); 4435 4436 // If this is a non-abstract class, check that it has no abstract 4437 // methods or unimplemented methods of an implemented interface. 4438 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4439 chk.checkAllDefined(tree.pos(), c); 4440 } 4441 4442 if ((c.flags() & ANNOTATION) != 0) { 4443 if (tree.implementing.nonEmpty()) 4444 log.error(tree.implementing.head.pos(), 4445 "cant.extend.intf.annotation"); 4446 if (tree.typarams.nonEmpty()) 4447 log.error(tree.typarams.head.pos(), 4448 "intf.annotation.cant.have.type.params"); 4449 4450 // If this annotation type has a @Repeatable, validate 4451 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable(); 4452 // If this annotation type has a @Repeatable, validate 4453 if (repeatable != null) { 4454 // get diagnostic position for error reporting 4455 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4456 Assert.checkNonNull(cbPos); 4457 4458 chk.validateRepeatable(c, repeatable, cbPos); 4459 } 4460 } else { 4461 // Check that all extended classes and interfaces 4462 // are compatible (i.e. no two define methods with same arguments 4463 // yet different return types). (JLS 8.4.6.3) 4464 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4465 if (allowDefaultMethods) { 4466 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4467 } 4468 } 4469 4470 // Check that class does not import the same parameterized interface 4471 // with two different argument lists. 4472 chk.checkClassBounds(tree.pos(), c.type); 4473 4474 tree.type = c.type; 4475 4476 for (List<JCTypeParameter> l = tree.typarams; 4477 l.nonEmpty(); l = l.tail) { 4478 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4479 } 4480 4481 // Check that a generic class doesn't extend Throwable 4482 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4483 log.error(tree.extending.pos(), "generic.throwable"); 4484 4485 // Check that all methods which implement some 4486 // method conform to the method they implement. 4487 chk.checkImplementations(tree); 4488 4489 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4490 checkAutoCloseable(tree.pos(), env, c.type); 4491 4492 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4493 // Attribute declaration 4494 attribStat(l.head, env); 4495 // Check that declarations in inner classes are not static (JLS 8.1.2) 4496 // Make an exception for static constants. 4497 if (c.owner.kind != PCK && 4498 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4499 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4500 Symbol sym = null; 4501 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4502 if (sym == null || 4503 sym.kind != VAR || 4504 ((VarSymbol) sym).getConstValue() == null) 4505 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4506 } 4507 } 4508 4509 // Check for cycles among non-initial constructors. 4510 chk.checkCyclicConstructors(tree); 4511 4512 // Check for cycles among annotation elements. 4513 chk.checkNonCyclicElements(tree); 4514 4515 // Check for proper use of serialVersionUID 4516 if (env.info.lint.isEnabled(LintCategory.SERIAL) 4517 && isSerializable(c.type) 4518 && (c.flags() & Flags.ENUM) == 0 4519 && !c.isAnonymous() 4520 && checkForSerial(c)) { 4521 checkSerialVersionUID(tree, c); 4522 } 4523 if (allowTypeAnnos) { 4524 // Correctly organize the postions of the type annotations 4525 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4526 4527 // Check type annotations applicability rules 4528 validateTypeAnnotations(tree, false); 4529 } 4530 } 4531 // where 4532 boolean checkForSerial(ClassSymbol c) { 4533 if ((c.flags() & ABSTRACT) == 0) { 4534 return true; 4535 } else { 4536 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4537 } 4538 } 4539 4540 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() { 4541 @Override 4542 public boolean accepts(Symbol s) { 4543 return s.kind == MTH && 4544 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4545 } 4546 }; 4547 4548 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4549 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4550 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4551 if (types.isSameType(al.head.annotationType.type, t)) 4552 return al.head.pos(); 4553 } 4554 4555 return null; 4556 } 4557 4558 /** check if a type is a subtype of Serializable, if that is available. */ 4559 boolean isSerializable(Type t) { 4560 try { 4561 syms.serializableType.complete(); 4562 } 4563 catch (CompletionFailure e) { 4564 return false; 4565 } 4566 return types.isSubtype(t, syms.serializableType); 4567 } 4568 4569 /** Check that an appropriate serialVersionUID member is defined. */ 4570 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4571 4572 // check for presence of serialVersionUID 4573 VarSymbol svuid = null; 4574 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4575 if (sym.kind == VAR) { 4576 svuid = (VarSymbol)sym; 4577 break; 4578 } 4579 } 4580 4581 if (svuid == null) { 4582 log.warning(LintCategory.SERIAL, 4583 tree.pos(), "missing.SVUID", c); 4584 return; 4585 } 4586 4587 // check that it is static final 4588 if ((svuid.flags() & (STATIC | FINAL)) != 4589 (STATIC | FINAL)) 4590 log.warning(LintCategory.SERIAL, 4591 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4592 4593 // check that it is long 4594 else if (!svuid.type.hasTag(LONG)) 4595 log.warning(LintCategory.SERIAL, 4596 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4597 4598 // check constant 4599 else if (svuid.getConstValue() == null) 4600 log.warning(LintCategory.SERIAL, 4601 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4602 } 4603 4604 private Type capture(Type type) { 4605 return types.capture(type); 4606 } 4607 4608 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4609 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4610 } 4611 //where 4612 private final class TypeAnnotationsValidator extends TreeScanner { 4613 4614 private final boolean sigOnly; 4615 public TypeAnnotationsValidator(boolean sigOnly) { 4616 this.sigOnly = sigOnly; 4617 } 4618 4619 public void visitAnnotation(JCAnnotation tree) { 4620 chk.validateTypeAnnotation(tree, false); 4621 super.visitAnnotation(tree); 4622 } 4623 public void visitAnnotatedType(JCAnnotatedType tree) { 4624 if (!tree.underlyingType.type.isErroneous()) { 4625 super.visitAnnotatedType(tree); 4626 } 4627 } 4628 public void visitTypeParameter(JCTypeParameter tree) { 4629 chk.validateTypeAnnotations(tree.annotations, true); 4630 scan(tree.bounds); 4631 // Don't call super. 4632 // This is needed because above we call validateTypeAnnotation with 4633 // false, which would forbid annotations on type parameters. 4634 // super.visitTypeParameter(tree); 4635 } 4636 public void visitMethodDef(JCMethodDecl tree) { 4637 if (tree.recvparam != null && 4638 !tree.recvparam.vartype.type.isErroneous()) { 4639 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4640 tree.recvparam.vartype.type.tsym); 4641 } 4642 if (tree.restype != null && tree.restype.type != null) { 4643 validateAnnotatedType(tree.restype, tree.restype.type); 4644 } 4645 if (sigOnly) { 4646 scan(tree.mods); 4647 scan(tree.restype); 4648 scan(tree.typarams); 4649 scan(tree.recvparam); 4650 scan(tree.params); 4651 scan(tree.thrown); 4652 } else { 4653 scan(tree.defaultValue); 4654 scan(tree.body); 4655 } 4656 } 4657 public void visitVarDef(final JCVariableDecl tree) { 4658 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4659 if (tree.sym != null && tree.sym.type != null) 4660 validateAnnotatedType(tree.vartype, tree.sym.type); 4661 scan(tree.mods); 4662 scan(tree.vartype); 4663 if (!sigOnly) { 4664 scan(tree.init); 4665 } 4666 } 4667 public void visitTypeCast(JCTypeCast tree) { 4668 if (tree.clazz != null && tree.clazz.type != null) 4669 validateAnnotatedType(tree.clazz, tree.clazz.type); 4670 super.visitTypeCast(tree); 4671 } 4672 public void visitTypeTest(JCInstanceOf tree) { 4673 if (tree.clazz != null && tree.clazz.type != null) 4674 validateAnnotatedType(tree.clazz, tree.clazz.type); 4675 super.visitTypeTest(tree); 4676 } 4677 public void visitNewClass(JCNewClass tree) { 4678 if (tree.clazz != null && tree.clazz.type != null) { 4679 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4680 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4681 tree.clazz.type.tsym); 4682 } 4683 if (tree.def != null) { 4684 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4685 } 4686 4687 validateAnnotatedType(tree.clazz, tree.clazz.type); 4688 } 4689 super.visitNewClass(tree); 4690 } 4691 public void visitNewArray(JCNewArray tree) { 4692 if (tree.elemtype != null && tree.elemtype.type != null) { 4693 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4694 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4695 tree.elemtype.type.tsym); 4696 } 4697 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4698 } 4699 super.visitNewArray(tree); 4700 } 4701 public void visitClassDef(JCClassDecl tree) { 4702 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4703 if (sigOnly) { 4704 scan(tree.mods); 4705 scan(tree.typarams); 4706 scan(tree.extending); 4707 scan(tree.implementing); 4708 } 4709 for (JCTree member : tree.defs) { 4710 if (member.hasTag(Tag.CLASSDEF)) { 4711 continue; 4712 } 4713 scan(member); 4714 } 4715 } 4716 public void visitBlock(JCBlock tree) { 4717 if (!sigOnly) { 4718 scan(tree.stats); 4719 } 4720 } 4721 4722 /* I would want to model this after 4723 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4724 * and override visitSelect and visitTypeApply. 4725 * However, we only set the annotated type in the top-level type 4726 * of the symbol. 4727 * Therefore, we need to override each individual location where a type 4728 * can occur. 4729 */ 4730 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4731 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4732 4733 if (type.isPrimitiveOrVoid()) { 4734 return; 4735 } 4736 4737 JCTree enclTr = errtree; 4738 Type enclTy = type; 4739 4740 boolean repeat = true; 4741 while (repeat) { 4742 if (enclTr.hasTag(TYPEAPPLY)) { 4743 List<Type> tyargs = enclTy.getTypeArguments(); 4744 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4745 if (trargs.length() > 0) { 4746 // Nothing to do for diamonds 4747 if (tyargs.length() == trargs.length()) { 4748 for (int i = 0; i < tyargs.length(); ++i) { 4749 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4750 } 4751 } 4752 // If the lengths don't match, it's either a diamond 4753 // or some nested type that redundantly provides 4754 // type arguments in the tree. 4755 } 4756 4757 // Look at the clazz part of a generic type 4758 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4759 } 4760 4761 if (enclTr.hasTag(SELECT)) { 4762 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4763 if (enclTy != null && 4764 !enclTy.hasTag(NONE)) { 4765 enclTy = enclTy.getEnclosingType(); 4766 } 4767 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4768 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4769 if (enclTy == null || enclTy.hasTag(NONE)) { 4770 if (at.getAnnotations().size() == 1) { 4771 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4772 } else { 4773 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4774 for (JCAnnotation an : at.getAnnotations()) { 4775 comps.add(an.attribute); 4776 } 4777 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4778 } 4779 repeat = false; 4780 } 4781 enclTr = at.underlyingType; 4782 // enclTy doesn't need to be changed 4783 } else if (enclTr.hasTag(IDENT)) { 4784 repeat = false; 4785 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4786 JCWildcard wc = (JCWildcard) enclTr; 4787 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4788 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4789 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4790 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4791 } else { 4792 // Nothing to do for UNBOUND 4793 } 4794 repeat = false; 4795 } else if (enclTr.hasTag(TYPEARRAY)) { 4796 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4797 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4798 repeat = false; 4799 } else if (enclTr.hasTag(TYPEUNION)) { 4800 JCTypeUnion ut = (JCTypeUnion) enclTr; 4801 for (JCTree t : ut.getTypeAlternatives()) { 4802 validateAnnotatedType(t, t.type); 4803 } 4804 repeat = false; 4805 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4806 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4807 for (JCTree t : it.getBounds()) { 4808 validateAnnotatedType(t, t.type); 4809 } 4810 repeat = false; 4811 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4812 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4813 repeat = false; 4814 } else { 4815 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4816 " within: "+ errtree + " with kind: " + errtree.getKind()); 4817 } 4818 } 4819 } 4820 4821 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4822 Symbol sym) { 4823 // Ensure that no declaration annotations are present. 4824 // Note that a tree type might be an AnnotatedType with 4825 // empty annotations, if only declaration annotations were given. 4826 // This method will raise an error for such a type. 4827 for (JCAnnotation ai : annotations) { 4828 if (!ai.type.isErroneous() && 4829 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4830 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type)); 4831 } 4832 } 4833 } 4834 } 4835 4836 // <editor-fold desc="post-attribution visitor"> 4837 4838 /** 4839 * Handle missing types/symbols in an AST. This routine is useful when 4840 * the compiler has encountered some errors (which might have ended up 4841 * terminating attribution abruptly); if the compiler is used in fail-over 4842 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4843 * prevents NPE to be progagated during subsequent compilation steps. 4844 */ 4845 public void postAttr(JCTree tree) { 4846 new PostAttrAnalyzer().scan(tree); 4847 } 4848 4849 class PostAttrAnalyzer extends TreeScanner { 4850 4851 private void initTypeIfNeeded(JCTree that) { 4852 if (that.type == null) { 4853 if (that.hasTag(METHODDEF)) { 4854 that.type = dummyMethodType((JCMethodDecl)that); 4855 } else { 4856 that.type = syms.unknownType; 4857 } 4858 } 4859 } 4860 4861 /* Construct a dummy method type. If we have a method declaration, 4862 * and the declared return type is void, then use that return type 4863 * instead of UNKNOWN to avoid spurious error messages in lambda 4864 * bodies (see:JDK-8041704). 4865 */ 4866 private Type dummyMethodType(JCMethodDecl md) { 4867 Type restype = syms.unknownType; 4868 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4869 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4870 if (prim.typetag == VOID) 4871 restype = syms.voidType; 4872 } 4873 return new MethodType(List.<Type>nil(), restype, 4874 List.<Type>nil(), syms.methodClass); 4875 } 4876 private Type dummyMethodType() { 4877 return dummyMethodType(null); 4878 } 4879 4880 @Override 4881 public void scan(JCTree tree) { 4882 if (tree == null) return; 4883 if (tree instanceof JCExpression) { 4884 initTypeIfNeeded(tree); 4885 } 4886 super.scan(tree); 4887 } 4888 4889 @Override 4890 public void visitIdent(JCIdent that) { 4891 if (that.sym == null) { 4892 that.sym = syms.unknownSymbol; 4893 } 4894 } 4895 4896 @Override 4897 public void visitSelect(JCFieldAccess that) { 4898 if (that.sym == null) { 4899 that.sym = syms.unknownSymbol; 4900 } 4901 super.visitSelect(that); 4902 } 4903 4904 @Override 4905 public void visitClassDef(JCClassDecl that) { 4906 initTypeIfNeeded(that); 4907 if (that.sym == null) { 4908 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4909 } 4910 super.visitClassDef(that); 4911 } 4912 4913 @Override 4914 public void visitMethodDef(JCMethodDecl that) { 4915 initTypeIfNeeded(that); 4916 if (that.sym == null) { 4917 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4918 } 4919 super.visitMethodDef(that); 4920 } 4921 4922 @Override 4923 public void visitVarDef(JCVariableDecl that) { 4924 initTypeIfNeeded(that); 4925 if (that.sym == null) { 4926 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4927 that.sym.adr = 0; 4928 } 4929 super.visitVarDef(that); 4930 } 4931 4932 @Override 4933 public void visitNewClass(JCNewClass that) { 4934 if (that.constructor == null) { 4935 that.constructor = new MethodSymbol(0, names.init, 4936 dummyMethodType(), syms.noSymbol); 4937 } 4938 if (that.constructorType == null) { 4939 that.constructorType = syms.unknownType; 4940 } 4941 super.visitNewClass(that); 4942 } 4943 4944 @Override 4945 public void visitAssignop(JCAssignOp that) { 4946 if (that.operator == null) { 4947 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4948 -1, syms.noSymbol); 4949 } 4950 super.visitAssignop(that); 4951 } 4952 4953 @Override 4954 public void visitBinary(JCBinary that) { 4955 if (that.operator == null) { 4956 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4957 -1, syms.noSymbol); 4958 } 4959 super.visitBinary(that); 4960 } 4961 4962 @Override 4963 public void visitUnary(JCUnary that) { 4964 if (that.operator == null) { 4965 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4966 -1, syms.noSymbol); 4967 } 4968 super.visitUnary(that); 4969 } 4970 4971 @Override 4972 public void visitLambda(JCLambda that) { 4973 super.visitLambda(that); 4974 if (that.targets == null) { 4975 that.targets = List.nil(); 4976 } 4977 } 4978 4979 @Override 4980 public void visitReference(JCMemberReference that) { 4981 super.visitReference(that); 4982 if (that.sym == null) { 4983 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 4984 syms.noSymbol); 4985 } 4986 if (that.targets == null) { 4987 that.targets = List.nil(); 4988 } 4989 } 4990 } 4991 // </editor-fold> 4992 4993 public void setPackageSymbols(JCExpression pid, Symbol pkg) { 4994 new TreeScanner() { 4995 Symbol packge = pkg; 4996 @Override 4997 public void visitIdent(JCIdent that) { 4998 that.sym = packge; 4999 } 5000 5001 @Override 5002 public void visitSelect(JCFieldAccess that) { 5003 that.sym = packge; 5004 packge = packge.owner; 5005 super.visitSelect(that); 5006 } 5007 }.scan(pid); 5008 } 5009 5010} 5011