Attr.java revision 2673:bf8500822576
1/* 2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.*; 29 30import javax.lang.model.element.ElementKind; 31import javax.tools.JavaFileObject; 32 33import com.sun.source.tree.IdentifierTree; 34import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 35import com.sun.source.tree.MemberSelectTree; 36import com.sun.source.tree.TreeVisitor; 37import com.sun.source.util.SimpleTreeVisitor; 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Lint.LintCategory; 40import com.sun.tools.javac.code.Scope.WriteableScope; 41import com.sun.tools.javac.code.Symbol.*; 42import com.sun.tools.javac.code.Type.*; 43import com.sun.tools.javac.comp.Check.CheckContext; 44import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 45import com.sun.tools.javac.comp.Infer.InferenceContext; 46import com.sun.tools.javac.comp.Infer.FreeTypeListener; 47import com.sun.tools.javac.jvm.*; 48import com.sun.tools.javac.tree.*; 49import com.sun.tools.javac.tree.JCTree.*; 50import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 51import com.sun.tools.javac.util.*; 52import com.sun.tools.javac.util.DefinedBy.Api; 53import com.sun.tools.javac.util.Dependencies.AttributionKind; 54import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 55import com.sun.tools.javac.util.List; 56import static com.sun.tools.javac.code.Flags.*; 57import static com.sun.tools.javac.code.Flags.ANNOTATION; 58import static com.sun.tools.javac.code.Flags.BLOCK; 59import static com.sun.tools.javac.code.Kinds.*; 60import static com.sun.tools.javac.code.Kinds.Kind.*; 61import static com.sun.tools.javac.code.TypeTag.*; 62import static com.sun.tools.javac.code.TypeTag.WILDCARD; 63import static com.sun.tools.javac.tree.JCTree.Tag.*; 64 65/** This is the main context-dependent analysis phase in GJC. It 66 * encompasses name resolution, type checking and constant folding as 67 * subtasks. Some subtasks involve auxiliary classes. 68 * @see Check 69 * @see Resolve 70 * @see ConstFold 71 * @see Infer 72 * 73 * <p><b>This is NOT part of any supported API. 74 * If you write code that depends on this, you do so at your own risk. 75 * This code and its internal interfaces are subject to change or 76 * deletion without notice.</b> 77 */ 78public class Attr extends JCTree.Visitor { 79 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 80 81 final Names names; 82 final Log log; 83 final Symtab syms; 84 final Resolve rs; 85 final Infer infer; 86 final DeferredAttr deferredAttr; 87 final Check chk; 88 final Flow flow; 89 final MemberEnter memberEnter; 90 final TreeMaker make; 91 final ConstFold cfolder; 92 final Enter enter; 93 final Target target; 94 final Types types; 95 final JCDiagnostic.Factory diags; 96 final Annotate annotate; 97 final TypeAnnotations typeAnnotations; 98 final DeferredLintHandler deferredLintHandler; 99 final TypeEnvs typeEnvs; 100 final Dependencies dependencies; 101 102 public static Attr instance(Context context) { 103 Attr instance = context.get(attrKey); 104 if (instance == null) 105 instance = new Attr(context); 106 return instance; 107 } 108 109 protected Attr(Context context) { 110 context.put(attrKey, this); 111 112 names = Names.instance(context); 113 log = Log.instance(context); 114 syms = Symtab.instance(context); 115 rs = Resolve.instance(context); 116 chk = Check.instance(context); 117 flow = Flow.instance(context); 118 memberEnter = MemberEnter.instance(context); 119 make = TreeMaker.instance(context); 120 enter = Enter.instance(context); 121 infer = Infer.instance(context); 122 deferredAttr = DeferredAttr.instance(context); 123 cfolder = ConstFold.instance(context); 124 target = Target.instance(context); 125 types = Types.instance(context); 126 diags = JCDiagnostic.Factory.instance(context); 127 annotate = Annotate.instance(context); 128 typeAnnotations = TypeAnnotations.instance(context); 129 deferredLintHandler = DeferredLintHandler.instance(context); 130 typeEnvs = TypeEnvs.instance(context); 131 dependencies = Dependencies.instance(context); 132 133 Options options = Options.instance(context); 134 135 Source source = Source.instance(context); 136 allowStringsInSwitch = source.allowStringsInSwitch(); 137 allowPoly = source.allowPoly(); 138 allowTypeAnnos = source.allowTypeAnnotations(); 139 allowLambda = source.allowLambda(); 140 allowDefaultMethods = source.allowDefaultMethods(); 141 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 142 sourceName = source.name; 143 relax = (options.isSet("-retrofit") || 144 options.isSet("-relax")); 145 findDiamonds = options.get("findDiamond") != null && 146 source.allowDiamond(); 147 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 148 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false); 149 150 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 151 varInfo = new ResultInfo(KindSelector.VAR, Type.noType); 152 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 153 unknownAnyPolyInfo = new ResultInfo(KindSelector.VAL, Infer.anyPoly); 154 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 155 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 156 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 157 } 158 159 /** Switch: relax some constraints for retrofit mode. 160 */ 161 boolean relax; 162 163 /** Switch: support target-typing inference 164 */ 165 boolean allowPoly; 166 167 /** Switch: support type annotations. 168 */ 169 boolean allowTypeAnnos; 170 171 /** Switch: support lambda expressions ? 172 */ 173 boolean allowLambda; 174 175 /** Switch: support default methods ? 176 */ 177 boolean allowDefaultMethods; 178 179 /** Switch: static interface methods enabled? 180 */ 181 boolean allowStaticInterfaceMethods; 182 183 /** Switch: generates a warning if diamond can be safely applied 184 * to a given new expression 185 */ 186 boolean findDiamonds; 187 188 /** 189 * Internally enables/disables diamond finder feature 190 */ 191 static final boolean allowDiamondFinder = true; 192 193 /** 194 * Switch: warn about use of variable before declaration? 195 * RFE: 6425594 196 */ 197 boolean useBeforeDeclarationWarning; 198 199 /** 200 * Switch: generate warnings whenever an anonymous inner class that is convertible 201 * to a lambda expression is found 202 */ 203 boolean identifyLambdaCandidate; 204 205 /** 206 * Switch: allow strings in switch? 207 */ 208 boolean allowStringsInSwitch; 209 210 /** 211 * Switch: name of source level; used for error reporting. 212 */ 213 String sourceName; 214 215 /** Check kind and type of given tree against protokind and prototype. 216 * If check succeeds, store type in tree and return it. 217 * If check fails, store errType in tree and return it. 218 * No checks are performed if the prototype is a method type. 219 * It is not necessary in this case since we know that kind and type 220 * are correct. 221 * 222 * @param tree The tree whose kind and type is checked 223 * @param ownkind The computed kind of the tree 224 * @param resultInfo The expected result of the tree 225 */ 226 Type check(final JCTree tree, 227 final Type found, 228 final KindSelector ownkind, 229 final ResultInfo resultInfo) { 230 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 231 Type owntype; 232 if (!found.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) { 233 if (!ownkind.subset(resultInfo.pkind)) { 234 log.error(tree.pos(), "unexpected.type", 235 resultInfo.pkind.kindNames(), 236 ownkind.kindNames()); 237 owntype = types.createErrorType(found); 238 } else if (allowPoly && inferenceContext.free(found)) { 239 //delay the check if there are inference variables in the found type 240 //this means we are dealing with a partially inferred poly expression 241 owntype = resultInfo.pt; 242 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() { 243 @Override 244 public void typesInferred(InferenceContext inferenceContext) { 245 ResultInfo pendingResult = 246 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 247 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult); 248 } 249 }); 250 } else { 251 owntype = resultInfo.check(tree, found); 252 } 253 } else { 254 owntype = found; 255 } 256 tree.type = owntype; 257 return owntype; 258 } 259 260 /** Is given blank final variable assignable, i.e. in a scope where it 261 * may be assigned to even though it is final? 262 * @param v The blank final variable. 263 * @param env The current environment. 264 */ 265 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 266 Symbol owner = env.info.scope.owner; 267 // owner refers to the innermost variable, method or 268 // initializer block declaration at this point. 269 return 270 v.owner == owner 271 || 272 ((owner.name == names.init || // i.e. we are in a constructor 273 owner.kind == VAR || // i.e. we are in a variable initializer 274 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 275 && 276 v.owner == owner.owner 277 && 278 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 279 } 280 281 /** Check that variable can be assigned to. 282 * @param pos The current source code position. 283 * @param v The assigned varaible 284 * @param base If the variable is referred to in a Select, the part 285 * to the left of the `.', null otherwise. 286 * @param env The current environment. 287 */ 288 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 289 if ((v.flags() & FINAL) != 0 && 290 ((v.flags() & HASINIT) != 0 291 || 292 !((base == null || 293 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 294 isAssignableAsBlankFinal(v, env)))) { 295 if (v.isResourceVariable()) { //TWR resource 296 log.error(pos, "try.resource.may.not.be.assigned", v); 297 } else { 298 log.error(pos, "cant.assign.val.to.final.var", v); 299 } 300 } 301 } 302 303 /** Does tree represent a static reference to an identifier? 304 * It is assumed that tree is either a SELECT or an IDENT. 305 * We have to weed out selects from non-type names here. 306 * @param tree The candidate tree. 307 */ 308 boolean isStaticReference(JCTree tree) { 309 if (tree.hasTag(SELECT)) { 310 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 311 if (lsym == null || lsym.kind != TYP) { 312 return false; 313 } 314 } 315 return true; 316 } 317 318 /** Is this symbol a type? 319 */ 320 static boolean isType(Symbol sym) { 321 return sym != null && sym.kind == TYP; 322 } 323 324 /** The current `this' symbol. 325 * @param env The current environment. 326 */ 327 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 328 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 329 } 330 331 /** Attribute a parsed identifier. 332 * @param tree Parsed identifier name 333 * @param topLevel The toplevel to use 334 */ 335 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 336 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 337 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 338 syms.errSymbol.name, 339 null, null, null, null); 340 localEnv.enclClass.sym = syms.errSymbol; 341 return tree.accept(identAttributer, localEnv); 342 } 343 // where 344 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 345 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 346 @Override @DefinedBy(Api.COMPILER_TREE) 347 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 348 Symbol site = visit(node.getExpression(), env); 349 if (site.kind == ERR || site.kind == ABSENT_TYP) 350 return site; 351 Name name = (Name)node.getIdentifier(); 352 if (site.kind == PCK) { 353 env.toplevel.packge = (PackageSymbol)site; 354 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 355 KindSelector.TYP_PCK); 356 } else { 357 env.enclClass.sym = (ClassSymbol)site; 358 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 359 } 360 } 361 362 @Override @DefinedBy(Api.COMPILER_TREE) 363 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 364 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 365 } 366 } 367 368 public Type coerce(Type etype, Type ttype) { 369 return cfolder.coerce(etype, ttype); 370 } 371 372 public Type attribType(JCTree node, TypeSymbol sym) { 373 Env<AttrContext> env = typeEnvs.get(sym); 374 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 375 return attribTree(node, localEnv, unknownTypeInfo); 376 } 377 378 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 379 // Attribute qualifying package or class. 380 JCFieldAccess s = (JCFieldAccess)tree.qualid; 381 return attribTree(s.selected, env, 382 new ResultInfo(tree.staticImport ? 383 KindSelector.TYP : KindSelector.TYP_PCK, 384 Type.noType)); 385 } 386 387 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 388 breakTree = tree; 389 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 390 try { 391 attribExpr(expr, env); 392 } catch (BreakAttr b) { 393 return b.env; 394 } catch (AssertionError ae) { 395 if (ae.getCause() instanceof BreakAttr) { 396 return ((BreakAttr)(ae.getCause())).env; 397 } else { 398 throw ae; 399 } 400 } finally { 401 breakTree = null; 402 log.useSource(prev); 403 } 404 return env; 405 } 406 407 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 408 breakTree = tree; 409 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 410 try { 411 attribStat(stmt, env); 412 } catch (BreakAttr b) { 413 return b.env; 414 } catch (AssertionError ae) { 415 if (ae.getCause() instanceof BreakAttr) { 416 return ((BreakAttr)(ae.getCause())).env; 417 } else { 418 throw ae; 419 } 420 } finally { 421 breakTree = null; 422 log.useSource(prev); 423 } 424 return env; 425 } 426 427 private JCTree breakTree = null; 428 429 private static class BreakAttr extends RuntimeException { 430 static final long serialVersionUID = -6924771130405446405L; 431 private Env<AttrContext> env; 432 private BreakAttr(Env<AttrContext> env) { 433 this.env = env; 434 } 435 } 436 437 class ResultInfo { 438 final KindSelector pkind; 439 final Type pt; 440 final CheckContext checkContext; 441 442 ResultInfo(KindSelector pkind, Type pt) { 443 this(pkind, pt, chk.basicHandler); 444 } 445 446 protected ResultInfo(KindSelector pkind, 447 Type pt, CheckContext checkContext) { 448 this.pkind = pkind; 449 this.pt = pt; 450 this.checkContext = checkContext; 451 } 452 453 protected Type check(final DiagnosticPosition pos, final Type found) { 454 return chk.checkType(pos, found, pt, checkContext); 455 } 456 457 protected ResultInfo dup(Type newPt) { 458 return new ResultInfo(pkind, newPt, checkContext); 459 } 460 461 protected ResultInfo dup(CheckContext newContext) { 462 return new ResultInfo(pkind, pt, newContext); 463 } 464 465 protected ResultInfo dup(Type newPt, CheckContext newContext) { 466 return new ResultInfo(pkind, newPt, newContext); 467 } 468 469 @Override 470 public String toString() { 471 if (pt != null) { 472 return pt.toString(); 473 } else { 474 return ""; 475 } 476 } 477 } 478 479 class RecoveryInfo extends ResultInfo { 480 481 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 482 super(KindSelector.VAL, Type.recoveryType, 483 new Check.NestedCheckContext(chk.basicHandler) { 484 @Override 485 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 486 return deferredAttrContext; 487 } 488 @Override 489 public boolean compatible(Type found, Type req, Warner warn) { 490 return true; 491 } 492 @Override 493 public void report(DiagnosticPosition pos, JCDiagnostic details) { 494 chk.basicHandler.report(pos, details); 495 } 496 }); 497 } 498 } 499 500 final ResultInfo statInfo; 501 final ResultInfo varInfo; 502 final ResultInfo unknownAnyPolyInfo; 503 final ResultInfo unknownExprInfo; 504 final ResultInfo unknownTypeInfo; 505 final ResultInfo unknownTypeExprInfo; 506 final ResultInfo recoveryInfo; 507 508 Type pt() { 509 return resultInfo.pt; 510 } 511 512 KindSelector pkind() { 513 return resultInfo.pkind; 514 } 515 516/* ************************************************************************ 517 * Visitor methods 518 *************************************************************************/ 519 520 /** Visitor argument: the current environment. 521 */ 522 Env<AttrContext> env; 523 524 /** Visitor argument: the currently expected attribution result. 525 */ 526 ResultInfo resultInfo; 527 528 /** Visitor result: the computed type. 529 */ 530 Type result; 531 532 /** Visitor method: attribute a tree, catching any completion failure 533 * exceptions. Return the tree's type. 534 * 535 * @param tree The tree to be visited. 536 * @param env The environment visitor argument. 537 * @param resultInfo The result info visitor argument. 538 */ 539 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 540 Env<AttrContext> prevEnv = this.env; 541 ResultInfo prevResult = this.resultInfo; 542 try { 543 this.env = env; 544 this.resultInfo = resultInfo; 545 tree.accept(this); 546 if (tree == breakTree && 547 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 548 throw new BreakAttr(copyEnv(env)); 549 } 550 return result; 551 } catch (CompletionFailure ex) { 552 tree.type = syms.errType; 553 return chk.completionError(tree.pos(), ex); 554 } finally { 555 this.env = prevEnv; 556 this.resultInfo = prevResult; 557 } 558 } 559 560 Env<AttrContext> copyEnv(Env<AttrContext> env) { 561 Env<AttrContext> newEnv = 562 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 563 if (newEnv.outer != null) { 564 newEnv.outer = copyEnv(newEnv.outer); 565 } 566 return newEnv; 567 } 568 569 WriteableScope copyScope(WriteableScope sc) { 570 WriteableScope newScope = WriteableScope.create(sc.owner); 571 List<Symbol> elemsList = List.nil(); 572 for (Symbol sym : sc.getSymbols()) { 573 elemsList = elemsList.prepend(sym); 574 } 575 for (Symbol s : elemsList) { 576 newScope.enter(s); 577 } 578 return newScope; 579 } 580 581 /** Derived visitor method: attribute an expression tree. 582 */ 583 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) { 584 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType)); 585 } 586 587 /** Derived visitor method: attribute an expression tree with 588 * no constraints on the computed type. 589 */ 590 public Type attribExpr(JCTree tree, Env<AttrContext> env) { 591 return attribTree(tree, env, unknownExprInfo); 592 } 593 594 /** Derived visitor method: attribute a type tree. 595 */ 596 public Type attribType(JCTree tree, Env<AttrContext> env) { 597 Type result = attribType(tree, env, Type.noType); 598 return result; 599 } 600 601 /** Derived visitor method: attribute a type tree. 602 */ 603 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) { 604 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt)); 605 return result; 606 } 607 608 /** Derived visitor method: attribute a statement or definition tree. 609 */ 610 public Type attribStat(JCTree tree, Env<AttrContext> env) { 611 return attribTree(tree, env, statInfo); 612 } 613 614 /** Attribute a list of expressions, returning a list of types. 615 */ 616 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 617 ListBuffer<Type> ts = new ListBuffer<>(); 618 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 619 ts.append(attribExpr(l.head, env, pt)); 620 return ts.toList(); 621 } 622 623 /** Attribute a list of statements, returning nothing. 624 */ 625 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 626 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 627 attribStat(l.head, env); 628 } 629 630 /** Attribute the arguments in a method call, returning the method kind. 631 */ 632 KindSelector attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 633 boolean polykind = false; 634 for (JCExpression arg : trees) { 635 Type argtype; 636 if (allowPoly && deferredAttr.isDeferred(env, arg)) { 637 argtype = deferredAttr.new DeferredType(arg, env); 638 polykind = true; 639 } else { 640 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo)); 641 } 642 argtypes.append(argtype); 643 } 644 return polykind ? KindSelector.VAL_POLY : KindSelector.VAL; 645 } 646 647 /** Attribute a type argument list, returning a list of types. 648 * Caller is responsible for calling checkRefTypes. 649 */ 650 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 651 ListBuffer<Type> argtypes = new ListBuffer<>(); 652 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 653 argtypes.append(attribType(l.head, env)); 654 return argtypes.toList(); 655 } 656 657 /** Attribute a type argument list, returning a list of types. 658 * Check that all the types are references. 659 */ 660 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 661 List<Type> types = attribAnyTypes(trees, env); 662 return chk.checkRefTypes(trees, types); 663 } 664 665 /** 666 * Attribute type variables (of generic classes or methods). 667 * Compound types are attributed later in attribBounds. 668 * @param typarams the type variables to enter 669 * @param env the current environment 670 */ 671 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 672 for (JCTypeParameter tvar : typarams) { 673 dependencies.push(AttributionKind.TVAR, tvar); 674 TypeVar a = (TypeVar)tvar.type; 675 a.tsym.flags_field |= UNATTRIBUTED; 676 a.bound = Type.noType; 677 if (!tvar.bounds.isEmpty()) { 678 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 679 for (JCExpression bound : tvar.bounds.tail) 680 bounds = bounds.prepend(attribType(bound, env)); 681 types.setBounds(a, bounds.reverse()); 682 } else { 683 // if no bounds are given, assume a single bound of 684 // java.lang.Object. 685 types.setBounds(a, List.of(syms.objectType)); 686 } 687 a.tsym.flags_field &= ~UNATTRIBUTED; 688 dependencies.pop(); 689 } 690 for (JCTypeParameter tvar : typarams) { 691 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 692 } 693 } 694 695 /** 696 * Attribute the type references in a list of annotations. 697 */ 698 void attribAnnotationTypes(List<JCAnnotation> annotations, 699 Env<AttrContext> env) { 700 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 701 JCAnnotation a = al.head; 702 attribType(a.annotationType, env); 703 } 704 } 705 706 /** 707 * Attribute a "lazy constant value". 708 * @param env The env for the const value 709 * @param initializer The initializer for the const value 710 * @param type The expected type, or null 711 * @see VarSymbol#setLazyConstValue 712 */ 713 public Object attribLazyConstantValue(Env<AttrContext> env, 714 JCVariableDecl variable, 715 Type type) { 716 717 DiagnosticPosition prevLintPos 718 = deferredLintHandler.setPos(variable.pos()); 719 720 try { 721 Type itype = attribExpr(variable.init, env, type); 722 if (itype.constValue() != null) { 723 return coerce(itype, type).constValue(); 724 } else { 725 return null; 726 } 727 } finally { 728 deferredLintHandler.setPos(prevLintPos); 729 } 730 } 731 732 /** Attribute type reference in an `extends' or `implements' clause. 733 * Supertypes of anonymous inner classes are usually already attributed. 734 * 735 * @param tree The tree making up the type reference. 736 * @param env The environment current at the reference. 737 * @param classExpected true if only a class is expected here. 738 * @param interfaceExpected true if only an interface is expected here. 739 */ 740 Type attribBase(JCTree tree, 741 Env<AttrContext> env, 742 boolean classExpected, 743 boolean interfaceExpected, 744 boolean checkExtensible) { 745 Type t = tree.type != null ? 746 tree.type : 747 attribType(tree, env); 748 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 749 } 750 Type checkBase(Type t, 751 JCTree tree, 752 Env<AttrContext> env, 753 boolean classExpected, 754 boolean interfaceExpected, 755 boolean checkExtensible) { 756 if (t.tsym.isAnonymous()) { 757 log.error(tree.pos(), "cant.inherit.from.anon"); 758 return types.createErrorType(t); 759 } 760 if (t.isErroneous()) 761 return t; 762 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 763 // check that type variable is already visible 764 if (t.getUpperBound() == null) { 765 log.error(tree.pos(), "illegal.forward.ref"); 766 return types.createErrorType(t); 767 } 768 } else { 769 t = chk.checkClassType(tree.pos(), t, checkExtensible); 770 } 771 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 772 log.error(tree.pos(), "intf.expected.here"); 773 // return errType is necessary since otherwise there might 774 // be undetected cycles which cause attribution to loop 775 return types.createErrorType(t); 776 } else if (checkExtensible && 777 classExpected && 778 (t.tsym.flags() & INTERFACE) != 0) { 779 log.error(tree.pos(), "no.intf.expected.here"); 780 return types.createErrorType(t); 781 } 782 if (checkExtensible && 783 ((t.tsym.flags() & FINAL) != 0)) { 784 log.error(tree.pos(), 785 "cant.inherit.from.final", t.tsym); 786 } 787 chk.checkNonCyclic(tree.pos(), t); 788 return t; 789 } 790 791 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 792 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 793 id.type = env.info.scope.owner.type; 794 id.sym = env.info.scope.owner; 795 return id.type; 796 } 797 798 public void visitClassDef(JCClassDecl tree) { 799 // Local and anonymous classes have not been entered yet, so we need to 800 // do it now. 801 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 802 enter.classEnter(tree, env); 803 } else { 804 // If this class declaration is part of a class level annotation, 805 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 806 // order to simplify later steps and allow for sensible error 807 // messages. 808 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 809 enter.classEnter(tree, env); 810 } 811 812 ClassSymbol c = tree.sym; 813 if (c == null) { 814 // exit in case something drastic went wrong during enter. 815 result = null; 816 } else { 817 // make sure class has been completed: 818 c.complete(); 819 820 // If this class appears as an anonymous class 821 // in a superclass constructor call where 822 // no explicit outer instance is given, 823 // disable implicit outer instance from being passed. 824 // (This would be an illegal access to "this before super"). 825 if (env.info.isSelfCall && 826 env.tree.hasTag(NEWCLASS) && 827 ((JCNewClass) env.tree).encl == null) 828 { 829 c.flags_field |= NOOUTERTHIS; 830 } 831 attribClass(tree.pos(), c); 832 result = tree.type = c.type; 833 } 834 } 835 836 public void visitMethodDef(JCMethodDecl tree) { 837 MethodSymbol m = tree.sym; 838 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 839 840 Lint lint = env.info.lint.augment(m); 841 Lint prevLint = chk.setLint(lint); 842 MethodSymbol prevMethod = chk.setMethod(m); 843 try { 844 deferredLintHandler.flush(tree.pos()); 845 chk.checkDeprecatedAnnotation(tree.pos(), m); 846 847 848 // Create a new environment with local scope 849 // for attributing the method. 850 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 851 localEnv.info.lint = lint; 852 853 attribStats(tree.typarams, localEnv); 854 855 // If we override any other methods, check that we do so properly. 856 // JLS ??? 857 if (m.isStatic()) { 858 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 859 } else { 860 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 861 } 862 chk.checkOverride(tree, m); 863 864 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 865 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 866 } 867 868 // Enter all type parameters into the local method scope. 869 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 870 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 871 872 ClassSymbol owner = env.enclClass.sym; 873 if ((owner.flags() & ANNOTATION) != 0 && 874 tree.params.nonEmpty()) 875 log.error(tree.params.head.pos(), 876 "intf.annotation.members.cant.have.params"); 877 878 // Attribute all value parameters. 879 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 880 attribStat(l.head, localEnv); 881 } 882 883 chk.checkVarargsMethodDecl(localEnv, tree); 884 885 // Check that type parameters are well-formed. 886 chk.validate(tree.typarams, localEnv); 887 888 // Check that result type is well-formed. 889 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 890 chk.validate(tree.restype, localEnv); 891 892 // Check that receiver type is well-formed. 893 if (tree.recvparam != null) { 894 // Use a new environment to check the receiver parameter. 895 // Otherwise I get "might not have been initialized" errors. 896 // Is there a better way? 897 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 898 attribType(tree.recvparam, newEnv); 899 chk.validate(tree.recvparam, newEnv); 900 } 901 902 // annotation method checks 903 if ((owner.flags() & ANNOTATION) != 0) { 904 // annotation method cannot have throws clause 905 if (tree.thrown.nonEmpty()) { 906 log.error(tree.thrown.head.pos(), 907 "throws.not.allowed.in.intf.annotation"); 908 } 909 // annotation method cannot declare type-parameters 910 if (tree.typarams.nonEmpty()) { 911 log.error(tree.typarams.head.pos(), 912 "intf.annotation.members.cant.have.type.params"); 913 } 914 // validate annotation method's return type (could be an annotation type) 915 chk.validateAnnotationType(tree.restype); 916 // ensure that annotation method does not clash with members of Object/Annotation 917 chk.validateAnnotationMethod(tree.pos(), m); 918 } 919 920 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 921 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 922 923 if (tree.body == null) { 924 // Empty bodies are only allowed for 925 // abstract, native, or interface methods, or for methods 926 // in a retrofit signature class. 927 if (tree.defaultValue != null) { 928 if ((owner.flags() & ANNOTATION) == 0) 929 log.error(tree.pos(), 930 "default.allowed.in.intf.annotation.member"); 931 } 932 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 && 933 !relax) 934 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 935 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) { 936 if ((owner.flags() & INTERFACE) != 0) { 937 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 938 } else { 939 log.error(tree.pos(), "abstract.meth.cant.have.body"); 940 } 941 } else if ((tree.mods.flags & NATIVE) != 0) { 942 log.error(tree.pos(), "native.meth.cant.have.body"); 943 } else { 944 // Add an implicit super() call unless an explicit call to 945 // super(...) or this(...) is given 946 // or we are compiling class java.lang.Object. 947 if (tree.name == names.init && owner.type != syms.objectType) { 948 JCBlock body = tree.body; 949 if (body.stats.isEmpty() || 950 !TreeInfo.isSelfCall(body.stats.head)) { 951 body.stats = body.stats. 952 prepend(memberEnter.SuperCall(make.at(body.pos), 953 List.<Type>nil(), 954 List.<JCVariableDecl>nil(), 955 false)); 956 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 957 (tree.mods.flags & GENERATEDCONSTR) == 0 && 958 TreeInfo.isSuperCall(body.stats.head)) { 959 // enum constructors are not allowed to call super 960 // directly, so make sure there aren't any super calls 961 // in enum constructors, except in the compiler 962 // generated one. 963 log.error(tree.body.stats.head.pos(), 964 "call.to.super.not.allowed.in.enum.ctor", 965 env.enclClass.sym); 966 } 967 } 968 969 // Attribute all type annotations in the body 970 annotate.annotateTypeLater(tree.body, localEnv, m, null); 971 annotate.flush(); 972 973 // Attribute method body. 974 attribStat(tree.body, localEnv); 975 } 976 977 localEnv.info.scope.leave(); 978 result = tree.type = m.type; 979 } finally { 980 chk.setLint(prevLint); 981 chk.setMethod(prevMethod); 982 } 983 } 984 985 public void visitVarDef(JCVariableDecl tree) { 986 // Local variables have not been entered yet, so we need to do it now: 987 if (env.info.scope.owner.kind == MTH) { 988 if (tree.sym != null) { 989 // parameters have already been entered 990 env.info.scope.enter(tree.sym); 991 } else { 992 memberEnter.memberEnter(tree, env); 993 annotate.flush(); 994 } 995 } else { 996 if (tree.init != null) { 997 // Field initializer expression need to be entered. 998 annotate.annotateTypeLater(tree.init, env, tree.sym, tree.pos()); 999 annotate.flush(); 1000 } 1001 } 1002 1003 VarSymbol v = tree.sym; 1004 Lint lint = env.info.lint.augment(v); 1005 Lint prevLint = chk.setLint(lint); 1006 1007 // Check that the variable's declared type is well-formed. 1008 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) && 1009 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT && 1010 (tree.sym.flags() & PARAMETER) != 0; 1011 chk.validate(tree.vartype, env, !isImplicitLambdaParameter); 1012 1013 try { 1014 v.getConstValue(); // ensure compile-time constant initializer is evaluated 1015 deferredLintHandler.flush(tree.pos()); 1016 chk.checkDeprecatedAnnotation(tree.pos(), v); 1017 1018 if (tree.init != null) { 1019 if ((v.flags_field & FINAL) == 0 || 1020 !memberEnter.needsLazyConstValue(tree.init)) { 1021 // Not a compile-time constant 1022 // Attribute initializer in a new environment 1023 // with the declared variable as owner. 1024 // Check that initializer conforms to variable's declared type. 1025 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env); 1026 initEnv.info.lint = lint; 1027 // In order to catch self-references, we set the variable's 1028 // declaration position to maximal possible value, effectively 1029 // marking the variable as undefined. 1030 initEnv.info.enclVar = v; 1031 attribExpr(tree.init, initEnv, v.type); 1032 } 1033 } 1034 result = tree.type = v.type; 1035 } 1036 finally { 1037 chk.setLint(prevLint); 1038 } 1039 } 1040 1041 public void visitSkip(JCSkip tree) { 1042 result = null; 1043 } 1044 1045 public void visitBlock(JCBlock tree) { 1046 if (env.info.scope.owner.kind == TYP) { 1047 // Block is a static or instance initializer; 1048 // let the owner of the environment be a freshly 1049 // created BLOCK-method. 1050 Symbol fakeOwner = 1051 new MethodSymbol(tree.flags | BLOCK | 1052 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1053 env.info.scope.owner); 1054 final Env<AttrContext> localEnv = 1055 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1056 1057 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1058 // Attribute all type annotations in the block 1059 annotate.annotateTypeLater(tree, localEnv, localEnv.info.scope.owner, null); 1060 annotate.flush(); 1061 attribStats(tree.stats, localEnv); 1062 1063 { 1064 // Store init and clinit type annotations with the ClassSymbol 1065 // to allow output in Gen.normalizeDefs. 1066 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1067 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1068 if ((tree.flags & STATIC) != 0) { 1069 cs.appendClassInitTypeAttributes(tas); 1070 } else { 1071 cs.appendInitTypeAttributes(tas); 1072 } 1073 } 1074 } else { 1075 // Create a new local environment with a local scope. 1076 Env<AttrContext> localEnv = 1077 env.dup(tree, env.info.dup(env.info.scope.dup())); 1078 try { 1079 attribStats(tree.stats, localEnv); 1080 } finally { 1081 localEnv.info.scope.leave(); 1082 } 1083 } 1084 result = null; 1085 } 1086 1087 public void visitDoLoop(JCDoWhileLoop tree) { 1088 attribStat(tree.body, env.dup(tree)); 1089 attribExpr(tree.cond, env, syms.booleanType); 1090 result = null; 1091 } 1092 1093 public void visitWhileLoop(JCWhileLoop tree) { 1094 attribExpr(tree.cond, env, syms.booleanType); 1095 attribStat(tree.body, env.dup(tree)); 1096 result = null; 1097 } 1098 1099 public void visitForLoop(JCForLoop tree) { 1100 Env<AttrContext> loopEnv = 1101 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1102 try { 1103 attribStats(tree.init, loopEnv); 1104 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1105 loopEnv.tree = tree; // before, we were not in loop! 1106 attribStats(tree.step, loopEnv); 1107 attribStat(tree.body, loopEnv); 1108 result = null; 1109 } 1110 finally { 1111 loopEnv.info.scope.leave(); 1112 } 1113 } 1114 1115 public void visitForeachLoop(JCEnhancedForLoop tree) { 1116 Env<AttrContext> loopEnv = 1117 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1118 try { 1119 //the Formal Parameter of a for-each loop is not in the scope when 1120 //attributing the for-each expression; we mimick this by attributing 1121 //the for-each expression first (against original scope). 1122 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1123 attribStat(tree.var, loopEnv); 1124 chk.checkNonVoid(tree.pos(), exprType); 1125 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1126 if (elemtype == null) { 1127 // or perhaps expr implements Iterable<T>? 1128 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1129 if (base == null) { 1130 log.error(tree.expr.pos(), 1131 "foreach.not.applicable.to.type", 1132 exprType, 1133 diags.fragment("type.req.array.or.iterable")); 1134 elemtype = types.createErrorType(exprType); 1135 } else { 1136 List<Type> iterableParams = base.allparams(); 1137 elemtype = iterableParams.isEmpty() 1138 ? syms.objectType 1139 : types.wildUpperBound(iterableParams.head); 1140 } 1141 } 1142 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1143 loopEnv.tree = tree; // before, we were not in loop! 1144 attribStat(tree.body, loopEnv); 1145 result = null; 1146 } 1147 finally { 1148 loopEnv.info.scope.leave(); 1149 } 1150 } 1151 1152 public void visitLabelled(JCLabeledStatement tree) { 1153 // Check that label is not used in an enclosing statement 1154 Env<AttrContext> env1 = env; 1155 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1156 if (env1.tree.hasTag(LABELLED) && 1157 ((JCLabeledStatement) env1.tree).label == tree.label) { 1158 log.error(tree.pos(), "label.already.in.use", 1159 tree.label); 1160 break; 1161 } 1162 env1 = env1.next; 1163 } 1164 1165 attribStat(tree.body, env.dup(tree)); 1166 result = null; 1167 } 1168 1169 public void visitSwitch(JCSwitch tree) { 1170 Type seltype = attribExpr(tree.selector, env); 1171 1172 Env<AttrContext> switchEnv = 1173 env.dup(tree, env.info.dup(env.info.scope.dup())); 1174 1175 try { 1176 1177 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1178 boolean stringSwitch = false; 1179 if (types.isSameType(seltype, syms.stringType)) { 1180 if (allowStringsInSwitch) { 1181 stringSwitch = true; 1182 } else { 1183 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1184 } 1185 } 1186 if (!enumSwitch && !stringSwitch) 1187 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1188 1189 // Attribute all cases and 1190 // check that there are no duplicate case labels or default clauses. 1191 Set<Object> labels = new HashSet<>(); // The set of case labels. 1192 boolean hasDefault = false; // Is there a default label? 1193 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1194 JCCase c = l.head; 1195 Env<AttrContext> caseEnv = 1196 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1197 try { 1198 if (c.pat != null) { 1199 if (enumSwitch) { 1200 Symbol sym = enumConstant(c.pat, seltype); 1201 if (sym == null) { 1202 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1203 } else if (!labels.add(sym)) { 1204 log.error(c.pos(), "duplicate.case.label"); 1205 } 1206 } else { 1207 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1208 if (!pattype.hasTag(ERROR)) { 1209 if (pattype.constValue() == null) { 1210 log.error(c.pat.pos(), 1211 (stringSwitch ? "string.const.req" : "const.expr.req")); 1212 } else if (labels.contains(pattype.constValue())) { 1213 log.error(c.pos(), "duplicate.case.label"); 1214 } else { 1215 labels.add(pattype.constValue()); 1216 } 1217 } 1218 } 1219 } else if (hasDefault) { 1220 log.error(c.pos(), "duplicate.default.label"); 1221 } else { 1222 hasDefault = true; 1223 } 1224 attribStats(c.stats, caseEnv); 1225 } finally { 1226 caseEnv.info.scope.leave(); 1227 addVars(c.stats, switchEnv.info.scope); 1228 } 1229 } 1230 1231 result = null; 1232 } 1233 finally { 1234 switchEnv.info.scope.leave(); 1235 } 1236 } 1237 // where 1238 /** Add any variables defined in stats to the switch scope. */ 1239 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1240 for (;stats.nonEmpty(); stats = stats.tail) { 1241 JCTree stat = stats.head; 1242 if (stat.hasTag(VARDEF)) 1243 switchScope.enter(((JCVariableDecl) stat).sym); 1244 } 1245 } 1246 // where 1247 /** Return the selected enumeration constant symbol, or null. */ 1248 private Symbol enumConstant(JCTree tree, Type enumType) { 1249 if (!tree.hasTag(IDENT)) { 1250 log.error(tree.pos(), "enum.label.must.be.unqualified.enum"); 1251 return syms.errSymbol; 1252 } 1253 JCIdent ident = (JCIdent)tree; 1254 Name name = ident.name; 1255 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1256 if (sym.kind == VAR) { 1257 Symbol s = ident.sym = sym; 1258 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1259 ident.type = s.type; 1260 return ((s.flags_field & Flags.ENUM) == 0) 1261 ? null : s; 1262 } 1263 } 1264 return null; 1265 } 1266 1267 public void visitSynchronized(JCSynchronized tree) { 1268 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1269 attribStat(tree.body, env); 1270 result = null; 1271 } 1272 1273 public void visitTry(JCTry tree) { 1274 // Create a new local environment with a local 1275 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1276 try { 1277 boolean isTryWithResource = tree.resources.nonEmpty(); 1278 // Create a nested environment for attributing the try block if needed 1279 Env<AttrContext> tryEnv = isTryWithResource ? 1280 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1281 localEnv; 1282 try { 1283 // Attribute resource declarations 1284 for (JCTree resource : tree.resources) { 1285 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1286 @Override 1287 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1288 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1289 } 1290 }; 1291 ResultInfo twrResult = 1292 new ResultInfo(KindSelector.VAL, 1293 syms.autoCloseableType, 1294 twrContext); 1295 if (resource.hasTag(VARDEF)) { 1296 attribStat(resource, tryEnv); 1297 twrResult.check(resource, resource.type); 1298 1299 //check that resource type cannot throw InterruptedException 1300 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1301 1302 VarSymbol var = ((JCVariableDecl) resource).sym; 1303 var.setData(ElementKind.RESOURCE_VARIABLE); 1304 } else { 1305 attribTree(resource, tryEnv, twrResult); 1306 } 1307 } 1308 // Attribute body 1309 attribStat(tree.body, tryEnv); 1310 } finally { 1311 if (isTryWithResource) 1312 tryEnv.info.scope.leave(); 1313 } 1314 1315 // Attribute catch clauses 1316 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1317 JCCatch c = l.head; 1318 Env<AttrContext> catchEnv = 1319 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1320 try { 1321 Type ctype = attribStat(c.param, catchEnv); 1322 if (TreeInfo.isMultiCatch(c)) { 1323 //multi-catch parameter is implicitly marked as final 1324 c.param.sym.flags_field |= FINAL | UNION; 1325 } 1326 if (c.param.sym.kind == VAR) { 1327 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1328 } 1329 chk.checkType(c.param.vartype.pos(), 1330 chk.checkClassType(c.param.vartype.pos(), ctype), 1331 syms.throwableType); 1332 attribStat(c.body, catchEnv); 1333 } finally { 1334 catchEnv.info.scope.leave(); 1335 } 1336 } 1337 1338 // Attribute finalizer 1339 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1340 result = null; 1341 } 1342 finally { 1343 localEnv.info.scope.leave(); 1344 } 1345 } 1346 1347 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1348 if (!resource.isErroneous() && 1349 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1350 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1351 Symbol close = syms.noSymbol; 1352 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1353 try { 1354 close = rs.resolveQualifiedMethod(pos, 1355 env, 1356 resource, 1357 names.close, 1358 List.<Type>nil(), 1359 List.<Type>nil()); 1360 } 1361 finally { 1362 log.popDiagnosticHandler(discardHandler); 1363 } 1364 if (close.kind == MTH && 1365 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1366 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1367 env.info.lint.isEnabled(LintCategory.TRY)) { 1368 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1369 } 1370 } 1371 } 1372 1373 public void visitConditional(JCConditional tree) { 1374 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1375 1376 tree.polyKind = (!allowPoly || 1377 pt().hasTag(NONE) && pt() != Type.recoveryType || 1378 isBooleanOrNumeric(env, tree)) ? 1379 PolyKind.STANDALONE : PolyKind.POLY; 1380 1381 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1382 //cannot get here (i.e. it means we are returning from void method - which is already an error) 1383 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1384 result = tree.type = types.createErrorType(resultInfo.pt); 1385 return; 1386 } 1387 1388 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1389 unknownExprInfo : 1390 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) { 1391 //this will use enclosing check context to check compatibility of 1392 //subexpression against target type; if we are in a method check context, 1393 //depending on whether boxing is allowed, we could have incompatibilities 1394 @Override 1395 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1396 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1397 } 1398 }); 1399 1400 Type truetype = attribTree(tree.truepart, env, condInfo); 1401 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1402 1403 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1404 if (condtype.constValue() != null && 1405 truetype.constValue() != null && 1406 falsetype.constValue() != null && 1407 !owntype.hasTag(NONE)) { 1408 //constant folding 1409 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1410 } 1411 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1412 } 1413 //where 1414 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1415 switch (tree.getTag()) { 1416 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1417 ((JCLiteral)tree).typetag == BOOLEAN || 1418 ((JCLiteral)tree).typetag == BOT; 1419 case LAMBDA: case REFERENCE: return false; 1420 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1421 case CONDEXPR: 1422 JCConditional condTree = (JCConditional)tree; 1423 return isBooleanOrNumeric(env, condTree.truepart) && 1424 isBooleanOrNumeric(env, condTree.falsepart); 1425 case APPLY: 1426 JCMethodInvocation speculativeMethodTree = 1427 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo); 1428 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType(); 1429 return types.unboxedTypeOrType(owntype).isPrimitive(); 1430 case NEWCLASS: 1431 JCExpression className = 1432 removeClassParams.translate(((JCNewClass)tree).clazz); 1433 JCExpression speculativeNewClassTree = 1434 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo); 1435 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive(); 1436 default: 1437 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type; 1438 speculativeType = types.unboxedTypeOrType(speculativeType); 1439 return speculativeType.isPrimitive(); 1440 } 1441 } 1442 //where 1443 TreeTranslator removeClassParams = new TreeTranslator() { 1444 @Override 1445 public void visitTypeApply(JCTypeApply tree) { 1446 result = translate(tree.clazz); 1447 } 1448 }; 1449 1450 /** Compute the type of a conditional expression, after 1451 * checking that it exists. See JLS 15.25. Does not take into 1452 * account the special case where condition and both arms 1453 * are constants. 1454 * 1455 * @param pos The source position to be used for error 1456 * diagnostics. 1457 * @param thentype The type of the expression's then-part. 1458 * @param elsetype The type of the expression's else-part. 1459 */ 1460 private Type condType(DiagnosticPosition pos, 1461 Type thentype, Type elsetype) { 1462 // If same type, that is the result 1463 if (types.isSameType(thentype, elsetype)) 1464 return thentype.baseType(); 1465 1466 Type thenUnboxed = (thentype.isPrimitive()) 1467 ? thentype : types.unboxedType(thentype); 1468 Type elseUnboxed = (elsetype.isPrimitive()) 1469 ? elsetype : types.unboxedType(elsetype); 1470 1471 // Otherwise, if both arms can be converted to a numeric 1472 // type, return the least numeric type that fits both arms 1473 // (i.e. return larger of the two, or return int if one 1474 // arm is short, the other is char). 1475 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1476 // If one arm has an integer subrange type (i.e., byte, 1477 // short, or char), and the other is an integer constant 1478 // that fits into the subrange, return the subrange type. 1479 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1480 elseUnboxed.hasTag(INT) && 1481 types.isAssignable(elseUnboxed, thenUnboxed)) { 1482 return thenUnboxed.baseType(); 1483 } 1484 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1485 thenUnboxed.hasTag(INT) && 1486 types.isAssignable(thenUnboxed, elseUnboxed)) { 1487 return elseUnboxed.baseType(); 1488 } 1489 1490 for (TypeTag tag : primitiveTags) { 1491 Type candidate = syms.typeOfTag[tag.ordinal()]; 1492 if (types.isSubtype(thenUnboxed, candidate) && 1493 types.isSubtype(elseUnboxed, candidate)) { 1494 return candidate; 1495 } 1496 } 1497 } 1498 1499 // Those were all the cases that could result in a primitive 1500 if (thentype.isPrimitive()) 1501 thentype = types.boxedClass(thentype).type; 1502 if (elsetype.isPrimitive()) 1503 elsetype = types.boxedClass(elsetype).type; 1504 1505 if (types.isSubtype(thentype, elsetype)) 1506 return elsetype.baseType(); 1507 if (types.isSubtype(elsetype, thentype)) 1508 return thentype.baseType(); 1509 1510 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) { 1511 log.error(pos, "neither.conditional.subtype", 1512 thentype, elsetype); 1513 return thentype.baseType(); 1514 } 1515 1516 // both are known to be reference types. The result is 1517 // lub(thentype,elsetype). This cannot fail, as it will 1518 // always be possible to infer "Object" if nothing better. 1519 return types.lub(thentype.baseType(), elsetype.baseType()); 1520 } 1521 1522 final static TypeTag[] primitiveTags = new TypeTag[]{ 1523 BYTE, 1524 CHAR, 1525 SHORT, 1526 INT, 1527 LONG, 1528 FLOAT, 1529 DOUBLE, 1530 BOOLEAN, 1531 }; 1532 1533 public void visitIf(JCIf tree) { 1534 attribExpr(tree.cond, env, syms.booleanType); 1535 attribStat(tree.thenpart, env); 1536 if (tree.elsepart != null) 1537 attribStat(tree.elsepart, env); 1538 chk.checkEmptyIf(tree); 1539 result = null; 1540 } 1541 1542 public void visitExec(JCExpressionStatement tree) { 1543 //a fresh environment is required for 292 inference to work properly --- 1544 //see Infer.instantiatePolymorphicSignatureInstance() 1545 Env<AttrContext> localEnv = env.dup(tree); 1546 attribExpr(tree.expr, localEnv); 1547 result = null; 1548 } 1549 1550 public void visitBreak(JCBreak tree) { 1551 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1552 result = null; 1553 } 1554 1555 public void visitContinue(JCContinue tree) { 1556 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env); 1557 result = null; 1558 } 1559 //where 1560 /** Return the target of a break or continue statement, if it exists, 1561 * report an error if not. 1562 * Note: The target of a labelled break or continue is the 1563 * (non-labelled) statement tree referred to by the label, 1564 * not the tree representing the labelled statement itself. 1565 * 1566 * @param pos The position to be used for error diagnostics 1567 * @param tag The tag of the jump statement. This is either 1568 * Tree.BREAK or Tree.CONTINUE. 1569 * @param label The label of the jump statement, or null if no 1570 * label is given. 1571 * @param env The environment current at the jump statement. 1572 */ 1573 private JCTree findJumpTarget(DiagnosticPosition pos, 1574 JCTree.Tag tag, 1575 Name label, 1576 Env<AttrContext> env) { 1577 // Search environments outwards from the point of jump. 1578 Env<AttrContext> env1 = env; 1579 LOOP: 1580 while (env1 != null) { 1581 switch (env1.tree.getTag()) { 1582 case LABELLED: 1583 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree; 1584 if (label == labelled.label) { 1585 // If jump is a continue, check that target is a loop. 1586 if (tag == CONTINUE) { 1587 if (!labelled.body.hasTag(DOLOOP) && 1588 !labelled.body.hasTag(WHILELOOP) && 1589 !labelled.body.hasTag(FORLOOP) && 1590 !labelled.body.hasTag(FOREACHLOOP)) 1591 log.error(pos, "not.loop.label", label); 1592 // Found labelled statement target, now go inwards 1593 // to next non-labelled tree. 1594 return TreeInfo.referencedStatement(labelled); 1595 } else { 1596 return labelled; 1597 } 1598 } 1599 break; 1600 case DOLOOP: 1601 case WHILELOOP: 1602 case FORLOOP: 1603 case FOREACHLOOP: 1604 if (label == null) return env1.tree; 1605 break; 1606 case SWITCH: 1607 if (label == null && tag == BREAK) return env1.tree; 1608 break; 1609 case LAMBDA: 1610 case METHODDEF: 1611 case CLASSDEF: 1612 break LOOP; 1613 default: 1614 } 1615 env1 = env1.next; 1616 } 1617 if (label != null) 1618 log.error(pos, "undef.label", label); 1619 else if (tag == CONTINUE) 1620 log.error(pos, "cont.outside.loop"); 1621 else 1622 log.error(pos, "break.outside.switch.loop"); 1623 return null; 1624 } 1625 1626 public void visitReturn(JCReturn tree) { 1627 // Check that there is an enclosing method which is 1628 // nested within than the enclosing class. 1629 if (env.info.returnResult == null) { 1630 log.error(tree.pos(), "ret.outside.meth"); 1631 } else { 1632 // Attribute return expression, if it exists, and check that 1633 // it conforms to result type of enclosing method. 1634 if (tree.expr != null) { 1635 if (env.info.returnResult.pt.hasTag(VOID)) { 1636 env.info.returnResult.checkContext.report(tree.expr.pos(), 1637 diags.fragment("unexpected.ret.val")); 1638 } 1639 attribTree(tree.expr, env, env.info.returnResult); 1640 } else if (!env.info.returnResult.pt.hasTag(VOID) && 1641 !env.info.returnResult.pt.hasTag(NONE)) { 1642 env.info.returnResult.checkContext.report(tree.pos(), 1643 diags.fragment("missing.ret.val")); 1644 } 1645 } 1646 result = null; 1647 } 1648 1649 public void visitThrow(JCThrow tree) { 1650 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType); 1651 if (allowPoly) { 1652 chk.checkType(tree, owntype, syms.throwableType); 1653 } 1654 result = null; 1655 } 1656 1657 public void visitAssert(JCAssert tree) { 1658 attribExpr(tree.cond, env, syms.booleanType); 1659 if (tree.detail != null) { 1660 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env)); 1661 } 1662 result = null; 1663 } 1664 1665 /** Visitor method for method invocations. 1666 * NOTE: The method part of an application will have in its type field 1667 * the return type of the method, not the method's type itself! 1668 */ 1669 public void visitApply(JCMethodInvocation tree) { 1670 // The local environment of a method application is 1671 // a new environment nested in the current one. 1672 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1673 1674 // The types of the actual method arguments. 1675 List<Type> argtypes; 1676 1677 // The types of the actual method type arguments. 1678 List<Type> typeargtypes = null; 1679 1680 Name methName = TreeInfo.name(tree.meth); 1681 1682 boolean isConstructorCall = 1683 methName == names._this || methName == names._super; 1684 1685 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1686 if (isConstructorCall) { 1687 // We are seeing a ...this(...) or ...super(...) call. 1688 // Check that this is the first statement in a constructor. 1689 if (checkFirstConstructorStat(tree, env)) { 1690 1691 // Record the fact 1692 // that this is a constructor call (using isSelfCall). 1693 localEnv.info.isSelfCall = true; 1694 1695 // Attribute arguments, yielding list of argument types. 1696 attribArgs(tree.args, localEnv, argtypesBuf); 1697 argtypes = argtypesBuf.toList(); 1698 typeargtypes = attribTypes(tree.typeargs, localEnv); 1699 1700 // Variable `site' points to the class in which the called 1701 // constructor is defined. 1702 Type site = env.enclClass.sym.type; 1703 if (methName == names._super) { 1704 if (site == syms.objectType) { 1705 log.error(tree.meth.pos(), "no.superclass", site); 1706 site = types.createErrorType(syms.objectType); 1707 } else { 1708 site = types.supertype(site); 1709 } 1710 } 1711 1712 if (site.hasTag(CLASS)) { 1713 Type encl = site.getEnclosingType(); 1714 while (encl != null && encl.hasTag(TYPEVAR)) 1715 encl = encl.getUpperBound(); 1716 if (encl.hasTag(CLASS)) { 1717 // we are calling a nested class 1718 1719 if (tree.meth.hasTag(SELECT)) { 1720 JCTree qualifier = ((JCFieldAccess) tree.meth).selected; 1721 1722 // We are seeing a prefixed call, of the form 1723 // <expr>.super(...). 1724 // Check that the prefix expression conforms 1725 // to the outer instance type of the class. 1726 chk.checkRefType(qualifier.pos(), 1727 attribExpr(qualifier, localEnv, 1728 encl)); 1729 } else if (methName == names._super) { 1730 // qualifier omitted; check for existence 1731 // of an appropriate implicit qualifier. 1732 rs.resolveImplicitThis(tree.meth.pos(), 1733 localEnv, site, true); 1734 } 1735 } else if (tree.meth.hasTag(SELECT)) { 1736 log.error(tree.meth.pos(), "illegal.qual.not.icls", 1737 site.tsym); 1738 } 1739 1740 // if we're calling a java.lang.Enum constructor, 1741 // prefix the implicit String and int parameters 1742 if (site.tsym == syms.enumSym) 1743 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType); 1744 1745 // Resolve the called constructor under the assumption 1746 // that we are referring to a superclass instance of the 1747 // current instance (JLS ???). 1748 boolean selectSuperPrev = localEnv.info.selectSuper; 1749 localEnv.info.selectSuper = true; 1750 localEnv.info.pendingResolutionPhase = null; 1751 Symbol sym = rs.resolveConstructor( 1752 tree.meth.pos(), localEnv, site, argtypes, typeargtypes); 1753 localEnv.info.selectSuper = selectSuperPrev; 1754 1755 // Set method symbol to resolved constructor... 1756 TreeInfo.setSymbol(tree.meth, sym); 1757 1758 // ...and check that it is legal in the current context. 1759 // (this will also set the tree's type) 1760 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1761 checkId(tree.meth, site, sym, localEnv, 1762 new ResultInfo(KindSelector.MTH, mpt)); 1763 } 1764 // Otherwise, `site' is an error type and we do nothing 1765 } 1766 result = tree.type = syms.voidType; 1767 } else { 1768 // Otherwise, we are seeing a regular method call. 1769 // Attribute the arguments, yielding list of argument types, ... 1770 KindSelector kind = attribArgs(tree.args, localEnv, argtypesBuf); 1771 argtypes = argtypesBuf.toList(); 1772 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1773 1774 // ... and attribute the method using as a prototype a methodtype 1775 // whose formal argument types is exactly the list of actual 1776 // arguments (this will also set the method symbol). 1777 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1778 localEnv.info.pendingResolutionPhase = null; 1779 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1780 1781 // Compute the result type. 1782 Type restype = mtype.getReturnType(); 1783 if (restype.hasTag(WILDCARD)) 1784 throw new AssertionError(mtype); 1785 1786 Type qualifier = (tree.meth.hasTag(SELECT)) 1787 ? ((JCFieldAccess) tree.meth).selected.type 1788 : env.enclClass.sym.type; 1789 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype); 1790 1791 chk.checkRefTypes(tree.typeargs, typeargtypes); 1792 1793 // Check that value of resulting type is admissible in the 1794 // current context. Also, capture the return type 1795 result = check(tree, capture(restype), KindSelector.VAL, resultInfo); 1796 } 1797 chk.validate(tree.typeargs, localEnv); 1798 } 1799 //where 1800 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1801 if (methodName == names.clone && types.isArray(qualifierType)) { 1802 // as a special case, array.clone() has a result that is 1803 // the same as static type of the array being cloned 1804 return qualifierType; 1805 } else if (methodName == names.getClass && argtypes.isEmpty()) { 1806 // as a special case, x.getClass() has type Class<? extends |X|> 1807 return new ClassType(restype.getEnclosingType(), 1808 List.<Type>of(new WildcardType(types.erasure(qualifierType), 1809 BoundKind.EXTENDS, 1810 syms.boundClass)), 1811 restype.tsym, 1812 restype.getMetadata()); 1813 } else { 1814 return restype; 1815 } 1816 } 1817 1818 /** Check that given application node appears as first statement 1819 * in a constructor call. 1820 * @param tree The application node 1821 * @param env The environment current at the application. 1822 */ 1823 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1824 JCMethodDecl enclMethod = env.enclMethod; 1825 if (enclMethod != null && enclMethod.name == names.init) { 1826 JCBlock body = enclMethod.body; 1827 if (body.stats.head.hasTag(EXEC) && 1828 ((JCExpressionStatement) body.stats.head).expr == tree) 1829 return true; 1830 } 1831 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1832 TreeInfo.name(tree.meth)); 1833 return false; 1834 } 1835 1836 /** Obtain a method type with given argument types. 1837 */ 1838 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1839 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass); 1840 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1841 } 1842 1843 public void visitNewClass(final JCNewClass tree) { 1844 Type owntype = types.createErrorType(tree.type); 1845 1846 // The local environment of a class creation is 1847 // a new environment nested in the current one. 1848 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1849 1850 // The anonymous inner class definition of the new expression, 1851 // if one is defined by it. 1852 JCClassDecl cdef = tree.def; 1853 1854 // If enclosing class is given, attribute it, and 1855 // complete class name to be fully qualified 1856 JCExpression clazz = tree.clazz; // Class field following new 1857 JCExpression clazzid; // Identifier in class field 1858 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1859 annoclazzid = null; 1860 1861 if (clazz.hasTag(TYPEAPPLY)) { 1862 clazzid = ((JCTypeApply) clazz).clazz; 1863 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1864 annoclazzid = (JCAnnotatedType) clazzid; 1865 clazzid = annoclazzid.underlyingType; 1866 } 1867 } else { 1868 if (clazz.hasTag(ANNOTATED_TYPE)) { 1869 annoclazzid = (JCAnnotatedType) clazz; 1870 clazzid = annoclazzid.underlyingType; 1871 } else { 1872 clazzid = clazz; 1873 } 1874 } 1875 1876 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1877 1878 if (tree.encl != null) { 1879 // We are seeing a qualified new, of the form 1880 // <expr>.new C <...> (...) ... 1881 // In this case, we let clazz stand for the name of the 1882 // allocated class C prefixed with the type of the qualifier 1883 // expression, so that we can 1884 // resolve it with standard techniques later. I.e., if 1885 // <expr> has type T, then <expr>.new C <...> (...) 1886 // yields a clazz T.C. 1887 Type encltype = chk.checkRefType(tree.encl.pos(), 1888 attribExpr(tree.encl, env)); 1889 // TODO 308: in <expr>.new C, do we also want to add the type annotations 1890 // from expr to the combined type, or not? Yes, do this. 1891 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 1892 ((JCIdent) clazzid).name); 1893 1894 EndPosTable endPosTable = this.env.toplevel.endPositions; 1895 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 1896 if (clazz.hasTag(ANNOTATED_TYPE)) { 1897 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 1898 List<JCAnnotation> annos = annoType.annotations; 1899 1900 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 1901 clazzid1 = make.at(tree.pos). 1902 TypeApply(clazzid1, 1903 ((JCTypeApply) clazz).arguments); 1904 } 1905 1906 clazzid1 = make.at(tree.pos). 1907 AnnotatedType(annos, clazzid1); 1908 } else if (clazz.hasTag(TYPEAPPLY)) { 1909 clazzid1 = make.at(tree.pos). 1910 TypeApply(clazzid1, 1911 ((JCTypeApply) clazz).arguments); 1912 } 1913 1914 clazz = clazzid1; 1915 } 1916 1917 // Attribute clazz expression and store 1918 // symbol + type back into the attributed tree. 1919 Type clazztype = TreeInfo.isEnumInit(env.tree) ? 1920 attribIdentAsEnumType(env, (JCIdent)clazz) : 1921 attribType(clazz, env); 1922 1923 clazztype = chk.checkDiamond(tree, clazztype); 1924 chk.validate(clazz, localEnv); 1925 if (tree.encl != null) { 1926 // We have to work in this case to store 1927 // symbol + type back into the attributed tree. 1928 tree.clazz.type = clazztype; 1929 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 1930 clazzid.type = ((JCIdent) clazzid).sym.type; 1931 if (annoclazzid != null) { 1932 annoclazzid.type = clazzid.type; 1933 } 1934 if (!clazztype.isErroneous()) { 1935 if (cdef != null && clazztype.tsym.isInterface()) { 1936 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 1937 } else if (clazztype.tsym.isStatic()) { 1938 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 1939 } 1940 } 1941 } else if (!clazztype.tsym.isInterface() && 1942 clazztype.getEnclosingType().hasTag(CLASS)) { 1943 // Check for the existence of an apropos outer instance 1944 rs.resolveImplicitThis(tree.pos(), env, clazztype); 1945 } 1946 1947 // Attribute constructor arguments. 1948 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1949 final KindSelector pkind = 1950 attribArgs(tree.args, localEnv, argtypesBuf); 1951 List<Type> argtypes = argtypesBuf.toList(); 1952 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 1953 1954 // If we have made no mistakes in the class type... 1955 if (clazztype.hasTag(CLASS)) { 1956 // Enums may not be instantiated except implicitly 1957 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 1958 (!env.tree.hasTag(VARDEF) || 1959 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 1960 ((JCVariableDecl) env.tree).init != tree)) 1961 log.error(tree.pos(), "enum.cant.be.instantiated"); 1962 // Check that class is not abstract 1963 if (cdef == null && 1964 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 1965 log.error(tree.pos(), "abstract.cant.be.instantiated", 1966 clazztype.tsym); 1967 } else if (cdef != null && clazztype.tsym.isInterface()) { 1968 // Check that no constructor arguments are given to 1969 // anonymous classes implementing an interface 1970 if (!argtypes.isEmpty()) 1971 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 1972 1973 if (!typeargtypes.isEmpty()) 1974 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 1975 1976 // Error recovery: pretend no arguments were supplied. 1977 argtypes = List.nil(); 1978 typeargtypes = List.nil(); 1979 } else if (TreeInfo.isDiamond(tree)) { 1980 ClassType site = new ClassType(clazztype.getEnclosingType(), 1981 clazztype.tsym.type.getTypeArguments(), 1982 clazztype.tsym, 1983 clazztype.getMetadata()); 1984 1985 Env<AttrContext> diamondEnv = localEnv.dup(tree); 1986 diamondEnv.info.selectSuper = cdef != null; 1987 diamondEnv.info.pendingResolutionPhase = null; 1988 1989 //if the type of the instance creation expression is a class type 1990 //apply method resolution inference (JLS 15.12.2.7). The return type 1991 //of the resolved constructor will be a partially instantiated type 1992 Symbol constructor = rs.resolveDiamond(tree.pos(), 1993 diamondEnv, 1994 site, 1995 argtypes, 1996 typeargtypes); 1997 tree.constructor = constructor.baseSymbol(); 1998 1999 final TypeSymbol csym = clazztype.tsym; 2000 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) { 2001 @Override 2002 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2003 enclosingContext.report(tree.clazz, 2004 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details)); 2005 } 2006 }); 2007 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2008 constructorType = checkId(tree, site, 2009 constructor, 2010 diamondEnv, 2011 diamondResult); 2012 2013 tree.clazz.type = types.createErrorType(clazztype); 2014 if (!constructorType.isErroneous()) { 2015 tree.clazz.type = clazztype = constructorType.getReturnType(); 2016 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2017 } 2018 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2019 } 2020 2021 // Resolve the called constructor under the assumption 2022 // that we are referring to a superclass instance of the 2023 // current instance (JLS ???). 2024 else { 2025 //the following code alters some of the fields in the current 2026 //AttrContext - hence, the current context must be dup'ed in 2027 //order to avoid downstream failures 2028 Env<AttrContext> rsEnv = localEnv.dup(tree); 2029 rsEnv.info.selectSuper = cdef != null; 2030 rsEnv.info.pendingResolutionPhase = null; 2031 tree.constructor = rs.resolveConstructor( 2032 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2033 if (cdef == null) { //do not check twice! 2034 tree.constructorType = checkId(tree, 2035 clazztype, 2036 tree.constructor, 2037 rsEnv, 2038 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes))); 2039 if (rsEnv.info.lastResolveVarargs()) 2040 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2041 } 2042 if (cdef == null && 2043 !clazztype.isErroneous() && 2044 clazztype.getTypeArguments().nonEmpty() && 2045 findDiamonds) { 2046 findDiamond(localEnv, tree, clazztype); 2047 } 2048 } 2049 2050 if (cdef != null) { 2051 // We are seeing an anonymous class instance creation. 2052 // In this case, the class instance creation 2053 // expression 2054 // 2055 // E.new <typeargs1>C<typargs2>(args) { ... } 2056 // 2057 // is represented internally as 2058 // 2059 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2060 // 2061 // This expression is then *transformed* as follows: 2062 // 2063 // (1) add an extends or implements clause 2064 // (2) add a constructor. 2065 // 2066 // For instance, if C is a class, and ET is the type of E, 2067 // the expression 2068 // 2069 // E.new <typeargs1>C<typargs2>(args) { ... } 2070 // 2071 // is translated to (where X is a fresh name and typarams is the 2072 // parameter list of the super constructor): 2073 // 2074 // new <typeargs1>X(<*nullchk*>E, args) where 2075 // X extends C<typargs2> { 2076 // <typarams> X(ET e, args) { 2077 // e.<typeargs1>super(args) 2078 // } 2079 // ... 2080 // } 2081 2082 if (clazztype.tsym.isInterface()) { 2083 cdef.implementing = List.of(clazz); 2084 } else { 2085 cdef.extending = clazz; 2086 } 2087 2088 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2089 isSerializable(clazztype)) { 2090 localEnv.info.isSerializable = true; 2091 } 2092 2093 attribStat(cdef, localEnv); 2094 2095 checkLambdaCandidate(tree, cdef.sym, clazztype); 2096 2097 // If an outer instance is given, 2098 // prefix it to the constructor arguments 2099 // and delete it from the new expression 2100 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2101 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2102 argtypes = argtypes.prepend(tree.encl.type); 2103 tree.encl = null; 2104 } 2105 2106 // Reassign clazztype and recompute constructor. 2107 clazztype = cdef.sym.type; 2108 Symbol sym = tree.constructor = rs.resolveConstructor( 2109 tree.pos(), localEnv, clazztype, argtypes, typeargtypes); 2110 Assert.check(!sym.kind.isOverloadError()); 2111 tree.constructor = sym; 2112 tree.constructorType = checkId(tree, 2113 clazztype, 2114 tree.constructor, 2115 localEnv, 2116 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes))); 2117 } 2118 2119 if (tree.constructor != null && tree.constructor.kind == MTH) 2120 owntype = clazztype; 2121 } 2122 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2123 chk.validate(tree.typeargs, localEnv); 2124 } 2125 //where 2126 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) { 2127 JCTypeApply ta = (JCTypeApply)tree.clazz; 2128 List<JCExpression> prevTypeargs = ta.arguments; 2129 try { 2130 //create a 'fake' diamond AST node by removing type-argument trees 2131 ta.arguments = List.nil(); 2132 ResultInfo findDiamondResult = new ResultInfo(KindSelector.VAL, 2133 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt()); 2134 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type; 2135 Type polyPt = allowPoly ? 2136 syms.objectType : 2137 clazztype; 2138 if (!inferred.isErroneous() && 2139 (allowPoly && pt() == Infer.anyPoly ? 2140 types.isSameType(inferred, clazztype) : 2141 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) { 2142 String key = types.isSameType(clazztype, inferred) ? 2143 "diamond.redundant.args" : 2144 "diamond.redundant.args.1"; 2145 log.warning(tree.clazz.pos(), key, clazztype, inferred); 2146 } 2147 } finally { 2148 ta.arguments = prevTypeargs; 2149 } 2150 } 2151 2152 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) { 2153 if (allowLambda && 2154 identifyLambdaCandidate && 2155 clazztype.hasTag(CLASS) && 2156 !pt().hasTag(NONE) && 2157 types.isFunctionalInterface(clazztype.tsym)) { 2158 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym); 2159 int count = 0; 2160 boolean found = false; 2161 for (Symbol sym : csym.members().getSymbols()) { 2162 if ((sym.flags() & SYNTHETIC) != 0 || 2163 sym.isConstructor()) continue; 2164 count++; 2165 if (sym.kind != MTH || 2166 !sym.name.equals(descriptor.name)) continue; 2167 Type mtype = types.memberType(clazztype, sym); 2168 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) { 2169 found = true; 2170 } 2171 } 2172 if (found && count == 1) { 2173 log.note(tree.def, "potential.lambda.found"); 2174 } 2175 } 2176 } 2177 2178 /** Make an attributed null check tree. 2179 */ 2180 public JCExpression makeNullCheck(JCExpression arg) { 2181 // optimization: X.this is never null; skip null check 2182 Name name = TreeInfo.name(arg); 2183 if (name == names._this || name == names._super) return arg; 2184 2185 JCTree.Tag optag = NULLCHK; 2186 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2187 tree.operator = syms.nullcheck; 2188 tree.type = arg.type; 2189 return tree; 2190 } 2191 2192 public void visitNewArray(JCNewArray tree) { 2193 Type owntype = types.createErrorType(tree.type); 2194 Env<AttrContext> localEnv = env.dup(tree); 2195 Type elemtype; 2196 if (tree.elemtype != null) { 2197 elemtype = attribType(tree.elemtype, localEnv); 2198 chk.validate(tree.elemtype, localEnv); 2199 owntype = elemtype; 2200 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2201 attribExpr(l.head, localEnv, syms.intType); 2202 owntype = new ArrayType(owntype, syms.arrayClass); 2203 } 2204 } else { 2205 // we are seeing an untyped aggregate { ... } 2206 // this is allowed only if the prototype is an array 2207 if (pt().hasTag(ARRAY)) { 2208 elemtype = types.elemtype(pt()); 2209 } else { 2210 if (!pt().hasTag(ERROR)) { 2211 log.error(tree.pos(), "illegal.initializer.for.type", 2212 pt()); 2213 } 2214 elemtype = types.createErrorType(pt()); 2215 } 2216 } 2217 if (tree.elems != null) { 2218 attribExprs(tree.elems, localEnv, elemtype); 2219 owntype = new ArrayType(elemtype, syms.arrayClass); 2220 } 2221 if (!types.isReifiable(elemtype)) 2222 log.error(tree.pos(), "generic.array.creation"); 2223 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2224 } 2225 2226 /* 2227 * A lambda expression can only be attributed when a target-type is available. 2228 * In addition, if the target-type is that of a functional interface whose 2229 * descriptor contains inference variables in argument position the lambda expression 2230 * is 'stuck' (see DeferredAttr). 2231 */ 2232 @Override 2233 public void visitLambda(final JCLambda that) { 2234 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2235 if (pt().hasTag(NONE)) { 2236 //lambda only allowed in assignment or method invocation/cast context 2237 log.error(that.pos(), "unexpected.lambda"); 2238 } 2239 result = that.type = types.createErrorType(pt()); 2240 return; 2241 } 2242 //create an environment for attribution of the lambda expression 2243 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2244 boolean needsRecovery = 2245 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2246 try { 2247 Type currentTarget = pt(); 2248 if (needsRecovery && isSerializable(currentTarget)) { 2249 localEnv.info.isSerializable = true; 2250 } 2251 List<Type> explicitParamTypes = null; 2252 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2253 //attribute lambda parameters 2254 attribStats(that.params, localEnv); 2255 explicitParamTypes = TreeInfo.types(that.params); 2256 } 2257 2258 Type lambdaType; 2259 if (pt() != Type.recoveryType) { 2260 /* We need to adjust the target. If the target is an 2261 * intersection type, for example: SAM & I1 & I2 ... 2262 * the target will be updated to SAM 2263 */ 2264 currentTarget = targetChecker.visit(currentTarget, that); 2265 if (explicitParamTypes != null) { 2266 currentTarget = infer.instantiateFunctionalInterface(that, 2267 currentTarget, explicitParamTypes, resultInfo.checkContext); 2268 } 2269 currentTarget = types.removeWildcards(currentTarget); 2270 lambdaType = types.findDescriptorType(currentTarget); 2271 } else { 2272 currentTarget = Type.recoveryType; 2273 lambdaType = fallbackDescriptorType(that); 2274 } 2275 2276 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2277 2278 if (lambdaType.hasTag(FORALL)) { 2279 //lambda expression target desc cannot be a generic method 2280 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2281 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2282 result = that.type = types.createErrorType(pt()); 2283 return; 2284 } 2285 2286 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2287 //add param type info in the AST 2288 List<Type> actuals = lambdaType.getParameterTypes(); 2289 List<JCVariableDecl> params = that.params; 2290 2291 boolean arityMismatch = false; 2292 2293 while (params.nonEmpty()) { 2294 if (actuals.isEmpty()) { 2295 //not enough actuals to perform lambda parameter inference 2296 arityMismatch = true; 2297 } 2298 //reset previously set info 2299 Type argType = arityMismatch ? 2300 syms.errType : 2301 actuals.head; 2302 params.head.vartype = make.at(params.head).Type(argType); 2303 params.head.sym = null; 2304 actuals = actuals.isEmpty() ? 2305 actuals : 2306 actuals.tail; 2307 params = params.tail; 2308 } 2309 2310 //attribute lambda parameters 2311 attribStats(that.params, localEnv); 2312 2313 if (arityMismatch) { 2314 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2315 result = that.type = types.createErrorType(currentTarget); 2316 return; 2317 } 2318 } 2319 2320 //from this point on, no recovery is needed; if we are in assignment context 2321 //we will be able to attribute the whole lambda body, regardless of errors; 2322 //if we are in a 'check' method context, and the lambda is not compatible 2323 //with the target-type, it will be recovered anyway in Attr.checkId 2324 needsRecovery = false; 2325 2326 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2327 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2328 new FunctionalReturnContext(resultInfo.checkContext); 2329 2330 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ? 2331 recoveryInfo : 2332 new ResultInfo(KindSelector.VAL, 2333 lambdaType.getReturnType(), funcContext); 2334 localEnv.info.returnResult = bodyResultInfo; 2335 2336 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2337 attribTree(that.getBody(), localEnv, bodyResultInfo); 2338 } else { 2339 JCBlock body = (JCBlock)that.body; 2340 attribStats(body.stats, localEnv); 2341 } 2342 2343 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2344 2345 boolean isSpeculativeRound = 2346 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2347 2348 preFlow(that); 2349 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2350 2351 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2352 2353 if (!isSpeculativeRound) { 2354 //add thrown types as bounds to the thrown types free variables if needed: 2355 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2356 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2357 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2358 2359 chk.unhandled(inferredThrownTypes, thrownTypes); 2360 } 2361 2362 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2363 } 2364 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2365 } catch (Types.FunctionDescriptorLookupError ex) { 2366 JCDiagnostic cause = ex.getDiagnostic(); 2367 resultInfo.checkContext.report(that, cause); 2368 result = that.type = types.createErrorType(pt()); 2369 return; 2370 } finally { 2371 localEnv.info.scope.leave(); 2372 if (needsRecovery) { 2373 attribTree(that, env, recoveryInfo); 2374 } 2375 } 2376 } 2377 //where 2378 void preFlow(JCLambda tree) { 2379 new PostAttrAnalyzer() { 2380 @Override 2381 public void scan(JCTree tree) { 2382 if (tree == null || 2383 (tree.type != null && 2384 tree.type == Type.stuckType)) { 2385 //don't touch stuck expressions! 2386 return; 2387 } 2388 super.scan(tree); 2389 } 2390 }.scan(tree); 2391 } 2392 2393 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2394 2395 @Override 2396 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2397 return t.isCompound() ? 2398 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2399 } 2400 2401 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2402 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2403 Type target = null; 2404 for (Type bound : ict.getExplicitComponents()) { 2405 TypeSymbol boundSym = bound.tsym; 2406 if (types.isFunctionalInterface(boundSym) && 2407 types.findDescriptorSymbol(boundSym) == desc) { 2408 target = bound; 2409 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2410 //bound must be an interface 2411 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2412 } 2413 } 2414 return target != null ? 2415 target : 2416 ict.getExplicitComponents().head; //error recovery 2417 } 2418 2419 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2420 ListBuffer<Type> targs = new ListBuffer<>(); 2421 ListBuffer<Type> supertypes = new ListBuffer<>(); 2422 for (Type i : ict.interfaces_field) { 2423 if (i.isParameterized()) { 2424 targs.appendList(i.tsym.type.allparams()); 2425 } 2426 supertypes.append(i.tsym.type); 2427 } 2428 IntersectionClassType notionalIntf = 2429 (IntersectionClassType)types.makeCompoundType(supertypes.toList()); 2430 notionalIntf.allparams_field = targs.toList(); 2431 notionalIntf.tsym.flags_field |= INTERFACE; 2432 return notionalIntf.tsym; 2433 } 2434 2435 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2436 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2437 diags.fragment(key, args))); 2438 } 2439 }; 2440 2441 private Type fallbackDescriptorType(JCExpression tree) { 2442 switch (tree.getTag()) { 2443 case LAMBDA: 2444 JCLambda lambda = (JCLambda)tree; 2445 List<Type> argtypes = List.nil(); 2446 for (JCVariableDecl param : lambda.params) { 2447 argtypes = param.vartype != null ? 2448 argtypes.append(param.vartype.type) : 2449 argtypes.append(syms.errType); 2450 } 2451 return new MethodType(argtypes, Type.recoveryType, 2452 List.of(syms.throwableType), syms.methodClass); 2453 case REFERENCE: 2454 return new MethodType(List.<Type>nil(), Type.recoveryType, 2455 List.of(syms.throwableType), syms.methodClass); 2456 default: 2457 Assert.error("Cannot get here!"); 2458 } 2459 return null; 2460 } 2461 2462 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2463 final InferenceContext inferenceContext, final Type... ts) { 2464 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2465 } 2466 2467 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2468 final InferenceContext inferenceContext, final List<Type> ts) { 2469 if (inferenceContext.free(ts)) { 2470 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() { 2471 @Override 2472 public void typesInferred(InferenceContext inferenceContext) { 2473 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts)); 2474 } 2475 }); 2476 } else { 2477 for (Type t : ts) { 2478 rs.checkAccessibleType(env, t); 2479 } 2480 } 2481 } 2482 2483 /** 2484 * Lambda/method reference have a special check context that ensures 2485 * that i.e. a lambda return type is compatible with the expected 2486 * type according to both the inherited context and the assignment 2487 * context. 2488 */ 2489 class FunctionalReturnContext extends Check.NestedCheckContext { 2490 2491 FunctionalReturnContext(CheckContext enclosingContext) { 2492 super(enclosingContext); 2493 } 2494 2495 @Override 2496 public boolean compatible(Type found, Type req, Warner warn) { 2497 //return type must be compatible in both current context and assignment context 2498 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn); 2499 } 2500 2501 @Override 2502 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2503 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2504 } 2505 } 2506 2507 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2508 2509 JCExpression expr; 2510 2511 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2512 super(enclosingContext); 2513 this.expr = expr; 2514 } 2515 2516 @Override 2517 public boolean compatible(Type found, Type req, Warner warn) { 2518 //a void return is compatible with an expression statement lambda 2519 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) || 2520 super.compatible(found, req, warn); 2521 } 2522 } 2523 2524 /** 2525 * Lambda compatibility. Check that given return types, thrown types, parameter types 2526 * are compatible with the expected functional interface descriptor. This means that: 2527 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2528 * types must be compatible with the return type of the expected descriptor. 2529 */ 2530 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2531 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2532 2533 //return values have already been checked - but if lambda has no return 2534 //values, we must ensure that void/value compatibility is correct; 2535 //this amounts at checking that, if a lambda body can complete normally, 2536 //the descriptor's return type must be void 2537 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2538 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2539 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2540 diags.fragment("missing.ret.val", returnType))); 2541 } 2542 2543 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2544 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2545 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2546 } 2547 } 2548 2549 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2550 * static field and that lambda has type annotations, these annotations will 2551 * also be stored at these fake clinit methods. 2552 * 2553 * LambdaToMethod also use fake clinit methods so they can be reused. 2554 * Also as LTM is a phase subsequent to attribution, the methods from 2555 * clinits can be safely removed by LTM to save memory. 2556 */ 2557 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2558 2559 public MethodSymbol removeClinit(ClassSymbol sym) { 2560 return clinits.remove(sym); 2561 } 2562 2563 /* This method returns an environment to be used to attribute a lambda 2564 * expression. 2565 * 2566 * The owner of this environment is a method symbol. If the current owner 2567 * is not a method, for example if the lambda is used to initialize 2568 * a field, then if the field is: 2569 * 2570 * - an instance field, we use the first constructor. 2571 * - a static field, we create a fake clinit method. 2572 */ 2573 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2574 Env<AttrContext> lambdaEnv; 2575 Symbol owner = env.info.scope.owner; 2576 if (owner.kind == VAR && owner.owner.kind == TYP) { 2577 //field initializer 2578 ClassSymbol enclClass = owner.enclClass(); 2579 Symbol newScopeOwner = env.info.scope.owner; 2580 /* if the field isn't static, then we can get the first constructor 2581 * and use it as the owner of the environment. This is what 2582 * LTM code is doing to look for type annotations so we are fine. 2583 */ 2584 if ((owner.flags() & STATIC) == 0) { 2585 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2586 newScopeOwner = s; 2587 break; 2588 } 2589 } else { 2590 /* if the field is static then we need to create a fake clinit 2591 * method, this method can later be reused by LTM. 2592 */ 2593 MethodSymbol clinit = clinits.get(enclClass); 2594 if (clinit == null) { 2595 Type clinitType = new MethodType(List.<Type>nil(), 2596 syms.voidType, List.<Type>nil(), syms.methodClass); 2597 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2598 names.clinit, clinitType, enclClass); 2599 clinit.params = List.<VarSymbol>nil(); 2600 clinits.put(enclClass, clinit); 2601 } 2602 newScopeOwner = clinit; 2603 } 2604 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2605 } else { 2606 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2607 } 2608 return lambdaEnv; 2609 } 2610 2611 @Override 2612 public void visitReference(final JCMemberReference that) { 2613 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2614 if (pt().hasTag(NONE)) { 2615 //method reference only allowed in assignment or method invocation/cast context 2616 log.error(that.pos(), "unexpected.mref"); 2617 } 2618 result = that.type = types.createErrorType(pt()); 2619 return; 2620 } 2621 final Env<AttrContext> localEnv = env.dup(that); 2622 try { 2623 //attribute member reference qualifier - if this is a constructor 2624 //reference, the expected kind must be a type 2625 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2626 2627 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2628 exprType = chk.checkConstructorRefType(that.expr, exprType); 2629 if (!exprType.isErroneous() && 2630 exprType.isRaw() && 2631 that.typeargs != null) { 2632 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2633 diags.fragment("mref.infer.and.explicit.params")); 2634 exprType = types.createErrorType(exprType); 2635 } 2636 } 2637 2638 if (exprType.isErroneous()) { 2639 //if the qualifier expression contains problems, 2640 //give up attribution of method reference 2641 result = that.type = exprType; 2642 return; 2643 } 2644 2645 if (TreeInfo.isStaticSelector(that.expr, names)) { 2646 //if the qualifier is a type, validate it; raw warning check is 2647 //omitted as we don't know at this stage as to whether this is a 2648 //raw selector (because of inference) 2649 chk.validate(that.expr, env, false); 2650 } 2651 2652 //attrib type-arguments 2653 List<Type> typeargtypes = List.nil(); 2654 if (that.typeargs != null) { 2655 typeargtypes = attribTypes(that.typeargs, localEnv); 2656 } 2657 2658 Type desc; 2659 Type currentTarget = pt(); 2660 boolean isTargetSerializable = 2661 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2662 isSerializable(currentTarget); 2663 if (currentTarget != Type.recoveryType) { 2664 currentTarget = types.removeWildcards(targetChecker.visit(currentTarget, that)); 2665 desc = types.findDescriptorType(currentTarget); 2666 } else { 2667 currentTarget = Type.recoveryType; 2668 desc = fallbackDescriptorType(that); 2669 } 2670 2671 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2672 List<Type> argtypes = desc.getParameterTypes(); 2673 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2674 2675 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2676 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2677 } 2678 2679 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2680 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2681 try { 2682 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2683 that.name, argtypes, typeargtypes, referenceCheck, 2684 resultInfo.checkContext.inferenceContext(), 2685 resultInfo.checkContext.deferredAttrContext().mode); 2686 } finally { 2687 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2688 } 2689 2690 Symbol refSym = refResult.fst; 2691 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2692 2693 if (refSym.kind != MTH) { 2694 boolean targetError; 2695 switch (refSym.kind) { 2696 case ABSENT_MTH: 2697 targetError = false; 2698 break; 2699 case WRONG_MTH: 2700 case WRONG_MTHS: 2701 case AMBIGUOUS: 2702 case HIDDEN: 2703 case STATICERR: 2704 case MISSING_ENCL: 2705 case WRONG_STATICNESS: 2706 targetError = true; 2707 break; 2708 default: 2709 Assert.error("unexpected result kind " + refSym.kind); 2710 targetError = false; 2711 } 2712 2713 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2714 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2715 2716 JCDiagnostic.DiagnosticType diagKind = targetError ? 2717 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2718 2719 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2720 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2721 2722 if (targetError && currentTarget == Type.recoveryType) { 2723 //a target error doesn't make sense during recovery stage 2724 //as we don't know what actual parameter types are 2725 result = that.type = currentTarget; 2726 return; 2727 } else { 2728 if (targetError) { 2729 resultInfo.checkContext.report(that, diag); 2730 } else { 2731 log.report(diag); 2732 } 2733 result = that.type = types.createErrorType(currentTarget); 2734 return; 2735 } 2736 } 2737 2738 that.sym = refSym.baseSymbol(); 2739 that.kind = lookupHelper.referenceKind(that.sym); 2740 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2741 2742 if (desc.getReturnType() == Type.recoveryType) { 2743 // stop here 2744 result = that.type = currentTarget; 2745 return; 2746 } 2747 2748 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2749 2750 if (that.getMode() == ReferenceMode.INVOKE && 2751 TreeInfo.isStaticSelector(that.expr, names) && 2752 that.kind.isUnbound() && 2753 !desc.getParameterTypes().head.isParameterized()) { 2754 chk.checkRaw(that.expr, localEnv); 2755 } 2756 2757 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2758 exprType.getTypeArguments().nonEmpty()) { 2759 //static ref with class type-args 2760 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2761 diags.fragment("static.mref.with.targs")); 2762 result = that.type = types.createErrorType(currentTarget); 2763 return; 2764 } 2765 2766 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) && 2767 !that.kind.isUnbound()) { 2768 //no static bound mrefs 2769 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2770 diags.fragment("static.bound.mref")); 2771 result = that.type = types.createErrorType(currentTarget); 2772 return; 2773 } 2774 2775 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2776 // Check that super-qualified symbols are not abstract (JLS) 2777 rs.checkNonAbstract(that.pos(), that.sym); 2778 } 2779 2780 if (isTargetSerializable) { 2781 chk.checkElemAccessFromSerializableLambda(that); 2782 } 2783 } 2784 2785 ResultInfo checkInfo = 2786 resultInfo.dup(newMethodTemplate( 2787 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2788 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2789 new FunctionalReturnContext(resultInfo.checkContext)); 2790 2791 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo); 2792 2793 if (that.kind.isUnbound() && 2794 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2795 //re-generate inference constraints for unbound receiver 2796 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 2797 //cannot happen as this has already been checked - we just need 2798 //to regenerate the inference constraints, as that has been lost 2799 //as a result of the call to inferenceContext.save() 2800 Assert.error("Can't get here"); 2801 } 2802 } 2803 2804 if (!refType.isErroneous()) { 2805 refType = types.createMethodTypeWithReturn(refType, 2806 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 2807 } 2808 2809 //go ahead with standard method reference compatibility check - note that param check 2810 //is a no-op (as this has been taken care during method applicability) 2811 boolean isSpeculativeRound = 2812 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2813 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 2814 if (!isSpeculativeRound) { 2815 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 2816 } 2817 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2818 } catch (Types.FunctionDescriptorLookupError ex) { 2819 JCDiagnostic cause = ex.getDiagnostic(); 2820 resultInfo.checkContext.report(that, cause); 2821 result = that.type = types.createErrorType(pt()); 2822 return; 2823 } 2824 } 2825 //where 2826 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 2827 //if this is a constructor reference, the expected kind must be a type 2828 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 2829 KindSelector.VAL_TYP : KindSelector.TYP, 2830 Type.noType); 2831 } 2832 2833 2834 @SuppressWarnings("fallthrough") 2835 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 2836 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2837 2838 Type resType; 2839 switch (tree.getMode()) { 2840 case NEW: 2841 if (!tree.expr.type.isRaw()) { 2842 resType = tree.expr.type; 2843 break; 2844 } 2845 default: 2846 resType = refType.getReturnType(); 2847 } 2848 2849 Type incompatibleReturnType = resType; 2850 2851 if (returnType.hasTag(VOID)) { 2852 incompatibleReturnType = null; 2853 } 2854 2855 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 2856 if (resType.isErroneous() || 2857 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) { 2858 incompatibleReturnType = null; 2859 } 2860 } 2861 2862 if (incompatibleReturnType != null) { 2863 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 2864 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 2865 } 2866 2867 if (!speculativeAttr) { 2868 List<Type> thrownTypes = checkContext.inferenceContext().asUndetVars(descriptor.getThrownTypes()); 2869 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 2870 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 2871 } 2872 } 2873 } 2874 2875 /** 2876 * Set functional type info on the underlying AST. Note: as the target descriptor 2877 * might contain inference variables, we might need to register an hook in the 2878 * current inference context. 2879 */ 2880 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 2881 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 2882 if (checkContext.inferenceContext().free(descriptorType)) { 2883 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() { 2884 public void typesInferred(InferenceContext inferenceContext) { 2885 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 2886 inferenceContext.asInstType(primaryTarget), checkContext); 2887 } 2888 }); 2889 } else { 2890 ListBuffer<Type> targets = new ListBuffer<>(); 2891 if (pt.hasTag(CLASS)) { 2892 if (pt.isCompound()) { 2893 targets.append(types.removeWildcards(primaryTarget)); //this goes first 2894 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 2895 if (t != primaryTarget) { 2896 targets.append(types.removeWildcards(t)); 2897 } 2898 } 2899 } else { 2900 targets.append(types.removeWildcards(primaryTarget)); 2901 } 2902 } 2903 fExpr.targets = targets.toList(); 2904 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2905 pt != Type.recoveryType) { 2906 //check that functional interface class is well-formed 2907 try { 2908 /* Types.makeFunctionalInterfaceClass() may throw an exception 2909 * when it's executed post-inference. See the listener code 2910 * above. 2911 */ 2912 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 2913 names.empty, List.of(fExpr.targets.head), ABSTRACT); 2914 if (csym != null) { 2915 chk.checkImplementations(env.tree, csym, csym); 2916 } 2917 } catch (Types.FunctionDescriptorLookupError ex) { 2918 JCDiagnostic cause = ex.getDiagnostic(); 2919 resultInfo.checkContext.report(env.tree, cause); 2920 } 2921 } 2922 } 2923 } 2924 2925 public void visitParens(JCParens tree) { 2926 Type owntype = attribTree(tree.expr, env, resultInfo); 2927 result = check(tree, owntype, pkind(), resultInfo); 2928 Symbol sym = TreeInfo.symbol(tree); 2929 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 2930 log.error(tree.pos(), "illegal.start.of.type"); 2931 } 2932 2933 public void visitAssign(JCAssign tree) { 2934 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo); 2935 Type capturedType = capture(owntype); 2936 attribExpr(tree.rhs, env, owntype); 2937 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 2938 } 2939 2940 public void visitAssignop(JCAssignOp tree) { 2941 // Attribute arguments. 2942 Type owntype = attribTree(tree.lhs, env, varInfo); 2943 Type operand = attribExpr(tree.rhs, env); 2944 // Find operator. 2945 Symbol operator = tree.operator = rs.resolveBinaryOperator( 2946 tree.pos(), tree.getTag().noAssignOp(), env, 2947 owntype, operand); 2948 2949 if (operator.kind == MTH && 2950 !owntype.isErroneous() && 2951 !operand.isErroneous()) { 2952 chk.checkOperator(tree.pos(), 2953 (OperatorSymbol)operator, 2954 tree.getTag().noAssignOp(), 2955 owntype, 2956 operand); 2957 chk.checkDivZero(tree.rhs.pos(), operator, operand); 2958 chk.checkCastable(tree.rhs.pos(), 2959 operator.type.getReturnType(), 2960 owntype); 2961 } 2962 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2963 } 2964 2965 public void visitUnary(JCUnary tree) { 2966 // Attribute arguments. 2967 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 2968 ? attribTree(tree.arg, env, varInfo) 2969 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 2970 2971 // Find operator. 2972 Symbol operator = tree.operator = 2973 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype); 2974 2975 Type owntype = types.createErrorType(tree.type); 2976 if (operator.kind == MTH && 2977 !argtype.isErroneous()) { 2978 owntype = (tree.getTag().isIncOrDecUnaryOp()) 2979 ? tree.arg.type 2980 : operator.type.getReturnType(); 2981 int opc = ((OperatorSymbol)operator).opcode; 2982 2983 // If the argument is constant, fold it. 2984 if (argtype.constValue() != null) { 2985 Type ctype = cfolder.fold1(opc, argtype); 2986 if (ctype != null) { 2987 owntype = cfolder.coerce(ctype, owntype); 2988 } 2989 } 2990 } 2991 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2992 } 2993 2994 public void visitBinary(JCBinary tree) { 2995 // Attribute arguments. 2996 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 2997 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env)); 2998 // Find operator. 2999 Symbol operator = tree.operator = 3000 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right); 3001 3002 Type owntype = types.createErrorType(tree.type); 3003 if (operator.kind == MTH && 3004 !left.isErroneous() && 3005 !right.isErroneous()) { 3006 owntype = operator.type.getReturnType(); 3007 // This will figure out when unboxing can happen and 3008 // choose the right comparison operator. 3009 int opc = chk.checkOperator(tree.lhs.pos(), 3010 (OperatorSymbol)operator, 3011 tree.getTag(), 3012 left, 3013 right); 3014 3015 // If both arguments are constants, fold them. 3016 if (left.constValue() != null && right.constValue() != null) { 3017 Type ctype = cfolder.fold2(opc, left, right); 3018 if (ctype != null) { 3019 owntype = cfolder.coerce(ctype, owntype); 3020 } 3021 } 3022 3023 // Check that argument types of a reference ==, != are 3024 // castable to each other, (JLS 15.21). Note: unboxing 3025 // comparisons will not have an acmp* opc at this point. 3026 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3027 if (!types.isEqualityComparable(left, right, 3028 new Warner(tree.pos()))) { 3029 log.error(tree.pos(), "incomparable.types", left, right); 3030 } 3031 } 3032 3033 chk.checkDivZero(tree.rhs.pos(), operator, right); 3034 } 3035 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3036 } 3037 3038 public void visitTypeCast(final JCTypeCast tree) { 3039 Type clazztype = attribType(tree.clazz, env); 3040 chk.validate(tree.clazz, env, false); 3041 //a fresh environment is required for 292 inference to work properly --- 3042 //see Infer.instantiatePolymorphicSignatureInstance() 3043 Env<AttrContext> localEnv = env.dup(tree); 3044 //should we propagate the target type? 3045 final ResultInfo castInfo; 3046 JCExpression expr = TreeInfo.skipParens(tree.expr); 3047 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3048 if (isPoly) { 3049 //expression is a poly - we need to propagate target type info 3050 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3051 new Check.NestedCheckContext(resultInfo.checkContext) { 3052 @Override 3053 public boolean compatible(Type found, Type req, Warner warn) { 3054 return types.isCastable(found, req, warn); 3055 } 3056 }); 3057 } else { 3058 //standalone cast - target-type info is not propagated 3059 castInfo = unknownExprInfo; 3060 } 3061 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3062 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3063 if (exprtype.constValue() != null) 3064 owntype = cfolder.coerce(exprtype, owntype); 3065 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3066 if (!isPoly) 3067 chk.checkRedundantCast(localEnv, tree); 3068 } 3069 3070 public void visitTypeTest(JCInstanceOf tree) { 3071 Type exprtype = chk.checkNullOrRefType( 3072 tree.expr.pos(), attribExpr(tree.expr, env)); 3073 Type clazztype = attribType(tree.clazz, env); 3074 if (!clazztype.hasTag(TYPEVAR)) { 3075 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3076 } 3077 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3078 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3079 clazztype = types.createErrorType(clazztype); 3080 } 3081 chk.validate(tree.clazz, env, false); 3082 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3083 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3084 } 3085 3086 public void visitIndexed(JCArrayAccess tree) { 3087 Type owntype = types.createErrorType(tree.type); 3088 Type atype = attribExpr(tree.indexed, env); 3089 attribExpr(tree.index, env, syms.intType); 3090 if (types.isArray(atype)) 3091 owntype = types.elemtype(atype); 3092 else if (!atype.hasTag(ERROR)) 3093 log.error(tree.pos(), "array.req.but.found", atype); 3094 if (!pkind().contains(KindSelector.VAL)) 3095 owntype = capture(owntype); 3096 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3097 } 3098 3099 public void visitIdent(JCIdent tree) { 3100 Symbol sym; 3101 3102 // Find symbol 3103 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3104 // If we are looking for a method, the prototype `pt' will be a 3105 // method type with the type of the call's arguments as parameters. 3106 env.info.pendingResolutionPhase = null; 3107 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3108 } else if (tree.sym != null && tree.sym.kind != VAR) { 3109 sym = tree.sym; 3110 } else { 3111 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3112 } 3113 tree.sym = sym; 3114 3115 // (1) Also find the environment current for the class where 3116 // sym is defined (`symEnv'). 3117 // Only for pre-tiger versions (1.4 and earlier): 3118 // (2) Also determine whether we access symbol out of an anonymous 3119 // class in a this or super call. This is illegal for instance 3120 // members since such classes don't carry a this$n link. 3121 // (`noOuterThisPath'). 3122 Env<AttrContext> symEnv = env; 3123 boolean noOuterThisPath = false; 3124 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3125 sym.kind.matches(KindSelector.VAL_MTH) && 3126 sym.owner.kind == TYP && 3127 tree.name != names._this && tree.name != names._super) { 3128 3129 // Find environment in which identifier is defined. 3130 while (symEnv.outer != null && 3131 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3132 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3133 noOuterThisPath = false; 3134 symEnv = symEnv.outer; 3135 } 3136 } 3137 3138 // If symbol is a variable, ... 3139 if (sym.kind == VAR) { 3140 VarSymbol v = (VarSymbol)sym; 3141 3142 // ..., evaluate its initializer, if it has one, and check for 3143 // illegal forward reference. 3144 checkInit(tree, env, v, false); 3145 3146 // If we are expecting a variable (as opposed to a value), check 3147 // that the variable is assignable in the current environment. 3148 if (pkind() == KindSelector.VAR) 3149 checkAssignable(tree.pos(), v, null, env); 3150 } 3151 3152 // In a constructor body, 3153 // if symbol is a field or instance method, check that it is 3154 // not accessed before the supertype constructor is called. 3155 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3156 sym.kind.matches(KindSelector.VAL_MTH) && 3157 sym.owner.kind == TYP && 3158 (sym.flags() & STATIC) == 0) { 3159 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3160 sym : thisSym(tree.pos(), env)); 3161 } 3162 Env<AttrContext> env1 = env; 3163 if (sym.kind != ERR && sym.kind != TYP && 3164 sym.owner != null && sym.owner != env1.enclClass.sym) { 3165 // If the found symbol is inaccessible, then it is 3166 // accessed through an enclosing instance. Locate this 3167 // enclosing instance: 3168 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3169 env1 = env1.outer; 3170 } 3171 3172 if (env.info.isSerializable) { 3173 chk.checkElemAccessFromSerializableLambda(tree); 3174 } 3175 3176 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3177 } 3178 3179 public void visitSelect(JCFieldAccess tree) { 3180 // Determine the expected kind of the qualifier expression. 3181 KindSelector skind = KindSelector.NIL; 3182 if (tree.name == names._this || tree.name == names._super || 3183 tree.name == names._class) 3184 { 3185 skind = KindSelector.TYP; 3186 } else { 3187 if (pkind().contains(KindSelector.PCK)) 3188 skind = KindSelector.of(skind, KindSelector.PCK); 3189 if (pkind().contains(KindSelector.TYP)) 3190 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3191 if (pkind().contains(KindSelector.VAL_MTH)) 3192 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3193 } 3194 3195 // Attribute the qualifier expression, and determine its symbol (if any). 3196 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly)); 3197 if (!pkind().contains(KindSelector.TYP_PCK)) 3198 site = capture(site); // Capture field access 3199 3200 // don't allow T.class T[].class, etc 3201 if (skind == KindSelector.TYP) { 3202 Type elt = site; 3203 while (elt.hasTag(ARRAY)) 3204 elt = ((ArrayType)elt).elemtype; 3205 if (elt.hasTag(TYPEVAR)) { 3206 log.error(tree.pos(), "type.var.cant.be.deref"); 3207 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3208 tree.sym = tree.type.tsym; 3209 return ; 3210 } 3211 } 3212 3213 // If qualifier symbol is a type or `super', assert `selectSuper' 3214 // for the selection. This is relevant for determining whether 3215 // protected symbols are accessible. 3216 Symbol sitesym = TreeInfo.symbol(tree.selected); 3217 boolean selectSuperPrev = env.info.selectSuper; 3218 env.info.selectSuper = 3219 sitesym != null && 3220 sitesym.name == names._super; 3221 3222 // Determine the symbol represented by the selection. 3223 env.info.pendingResolutionPhase = null; 3224 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3225 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3226 site = capture(site); 3227 sym = selectSym(tree, sitesym, site, env, resultInfo); 3228 } 3229 boolean varArgs = env.info.lastResolveVarargs(); 3230 tree.sym = sym; 3231 3232 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3233 while (site.hasTag(TYPEVAR)) site = site.getUpperBound(); 3234 site = capture(site); 3235 } 3236 3237 // If that symbol is a variable, ... 3238 if (sym.kind == VAR) { 3239 VarSymbol v = (VarSymbol)sym; 3240 3241 // ..., evaluate its initializer, if it has one, and check for 3242 // illegal forward reference. 3243 checkInit(tree, env, v, true); 3244 3245 // If we are expecting a variable (as opposed to a value), check 3246 // that the variable is assignable in the current environment. 3247 if (pkind() == KindSelector.VAR) 3248 checkAssignable(tree.pos(), v, tree.selected, env); 3249 } 3250 3251 if (sitesym != null && 3252 sitesym.kind == VAR && 3253 ((VarSymbol)sitesym).isResourceVariable() && 3254 sym.kind == MTH && 3255 sym.name.equals(names.close) && 3256 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3257 env.info.lint.isEnabled(LintCategory.TRY)) { 3258 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3259 } 3260 3261 // Disallow selecting a type from an expression 3262 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3263 tree.type = check(tree.selected, pt(), 3264 sitesym == null ? 3265 KindSelector.VAL : sitesym.kind.toSelector(), 3266 new ResultInfo(KindSelector.TYP_PCK, pt())); 3267 } 3268 3269 if (isType(sitesym)) { 3270 if (sym.name == names._this) { 3271 // If `C' is the currently compiled class, check that 3272 // C.this' does not appear in a call to a super(...) 3273 if (env.info.isSelfCall && 3274 site.tsym == env.enclClass.sym) { 3275 chk.earlyRefError(tree.pos(), sym); 3276 } 3277 } else { 3278 // Check if type-qualified fields or methods are static (JLS) 3279 if ((sym.flags() & STATIC) == 0 && 3280 !env.next.tree.hasTag(REFERENCE) && 3281 sym.name != names._super && 3282 (sym.kind == VAR || sym.kind == MTH)) { 3283 rs.accessBase(rs.new StaticError(sym), 3284 tree.pos(), site, sym.name, true); 3285 } 3286 } 3287 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3288 sym.isStatic() && sym.kind == MTH) { 3289 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3290 } 3291 } else if (sym.kind != ERR && 3292 (sym.flags() & STATIC) != 0 && 3293 sym.name != names._class) { 3294 // If the qualified item is not a type and the selected item is static, report 3295 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3296 chk.warnStatic(tree, "static.not.qualified.by.type", 3297 sym.kind.kindName(), sym.owner); 3298 } 3299 3300 // If we are selecting an instance member via a `super', ... 3301 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3302 3303 // Check that super-qualified symbols are not abstract (JLS) 3304 rs.checkNonAbstract(tree.pos(), sym); 3305 3306 if (site.isRaw()) { 3307 // Determine argument types for site. 3308 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3309 if (site1 != null) site = site1; 3310 } 3311 } 3312 3313 if (env.info.isSerializable) { 3314 chk.checkElemAccessFromSerializableLambda(tree); 3315 } 3316 3317 env.info.selectSuper = selectSuperPrev; 3318 result = checkId(tree, site, sym, env, resultInfo); 3319 } 3320 //where 3321 /** Determine symbol referenced by a Select expression, 3322 * 3323 * @param tree The select tree. 3324 * @param site The type of the selected expression, 3325 * @param env The current environment. 3326 * @param resultInfo The current result. 3327 */ 3328 private Symbol selectSym(JCFieldAccess tree, 3329 Symbol location, 3330 Type site, 3331 Env<AttrContext> env, 3332 ResultInfo resultInfo) { 3333 DiagnosticPosition pos = tree.pos(); 3334 Name name = tree.name; 3335 switch (site.getTag()) { 3336 case PACKAGE: 3337 return rs.accessBase( 3338 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3339 pos, location, site, name, true); 3340 case ARRAY: 3341 case CLASS: 3342 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3343 return rs.resolveQualifiedMethod( 3344 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3345 } else if (name == names._this || name == names._super) { 3346 return rs.resolveSelf(pos, env, site.tsym, name); 3347 } else if (name == names._class) { 3348 // In this case, we have already made sure in 3349 // visitSelect that qualifier expression is a type. 3350 Type t = syms.classType; 3351 List<Type> typeargs = List.of(types.erasure(site)); 3352 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3353 return new VarSymbol( 3354 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3355 } else { 3356 // We are seeing a plain identifier as selector. 3357 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3358 sym = rs.accessBase(sym, pos, location, site, name, true); 3359 return sym; 3360 } 3361 case WILDCARD: 3362 throw new AssertionError(tree); 3363 case TYPEVAR: 3364 // Normally, site.getUpperBound() shouldn't be null. 3365 // It should only happen during memberEnter/attribBase 3366 // when determining the super type which *must* beac 3367 // done before attributing the type variables. In 3368 // other words, we are seeing this illegal program: 3369 // class B<T> extends A<T.foo> {} 3370 Symbol sym = (site.getUpperBound() != null) 3371 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3372 : null; 3373 if (sym == null) { 3374 log.error(pos, "type.var.cant.be.deref"); 3375 return syms.errSymbol; 3376 } else { 3377 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3378 rs.new AccessError(env, site, sym) : 3379 sym; 3380 rs.accessBase(sym2, pos, location, site, name, true); 3381 return sym; 3382 } 3383 case ERROR: 3384 // preserve identifier names through errors 3385 return types.createErrorType(name, site.tsym, site).tsym; 3386 default: 3387 // The qualifier expression is of a primitive type -- only 3388 // .class is allowed for these. 3389 if (name == names._class) { 3390 // In this case, we have already made sure in Select that 3391 // qualifier expression is a type. 3392 Type t = syms.classType; 3393 Type arg = types.boxedClass(site).type; 3394 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3395 return new VarSymbol( 3396 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3397 } else { 3398 log.error(pos, "cant.deref", site); 3399 return syms.errSymbol; 3400 } 3401 } 3402 } 3403 3404 /** Determine type of identifier or select expression and check that 3405 * (1) the referenced symbol is not deprecated 3406 * (2) the symbol's type is safe (@see checkSafe) 3407 * (3) if symbol is a variable, check that its type and kind are 3408 * compatible with the prototype and protokind. 3409 * (4) if symbol is an instance field of a raw type, 3410 * which is being assigned to, issue an unchecked warning if its 3411 * type changes under erasure. 3412 * (5) if symbol is an instance method of a raw type, issue an 3413 * unchecked warning if its argument types change under erasure. 3414 * If checks succeed: 3415 * If symbol is a constant, return its constant type 3416 * else if symbol is a method, return its result type 3417 * otherwise return its type. 3418 * Otherwise return errType. 3419 * 3420 * @param tree The syntax tree representing the identifier 3421 * @param site If this is a select, the type of the selected 3422 * expression, otherwise the type of the current class. 3423 * @param sym The symbol representing the identifier. 3424 * @param env The current environment. 3425 * @param resultInfo The expected result 3426 */ 3427 Type checkId(JCTree tree, 3428 Type site, 3429 Symbol sym, 3430 Env<AttrContext> env, 3431 ResultInfo resultInfo) { 3432 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3433 checkMethodId(tree, site, sym, env, resultInfo) : 3434 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3435 } 3436 3437 Type checkMethodId(JCTree tree, 3438 Type site, 3439 Symbol sym, 3440 Env<AttrContext> env, 3441 ResultInfo resultInfo) { 3442 boolean isPolymorhicSignature = 3443 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3444 return isPolymorhicSignature ? 3445 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3446 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3447 } 3448 3449 Type checkSigPolyMethodId(JCTree tree, 3450 Type site, 3451 Symbol sym, 3452 Env<AttrContext> env, 3453 ResultInfo resultInfo) { 3454 //recover original symbol for signature polymorphic methods 3455 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3456 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3457 return sym.type; 3458 } 3459 3460 Type checkMethodIdInternal(JCTree tree, 3461 Type site, 3462 Symbol sym, 3463 Env<AttrContext> env, 3464 ResultInfo resultInfo) { 3465 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3466 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3467 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3468 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3469 return owntype; 3470 } else { 3471 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3472 } 3473 } 3474 3475 Type checkIdInternal(JCTree tree, 3476 Type site, 3477 Symbol sym, 3478 Type pt, 3479 Env<AttrContext> env, 3480 ResultInfo resultInfo) { 3481 if (pt.isErroneous()) { 3482 return types.createErrorType(site); 3483 } 3484 Type owntype; // The computed type of this identifier occurrence. 3485 switch (sym.kind) { 3486 case TYP: 3487 // For types, the computed type equals the symbol's type, 3488 // except for two situations: 3489 owntype = sym.type; 3490 if (owntype.hasTag(CLASS)) { 3491 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3492 Type ownOuter = owntype.getEnclosingType(); 3493 3494 // (a) If the symbol's type is parameterized, erase it 3495 // because no type parameters were given. 3496 // We recover generic outer type later in visitTypeApply. 3497 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3498 owntype = types.erasure(owntype); 3499 } 3500 3501 // (b) If the symbol's type is an inner class, then 3502 // we have to interpret its outer type as a superclass 3503 // of the site type. Example: 3504 // 3505 // class Tree<A> { class Visitor { ... } } 3506 // class PointTree extends Tree<Point> { ... } 3507 // ...PointTree.Visitor... 3508 // 3509 // Then the type of the last expression above is 3510 // Tree<Point>.Visitor. 3511 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3512 Type normOuter = site; 3513 if (normOuter.hasTag(CLASS)) { 3514 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3515 } 3516 if (normOuter == null) // perhaps from an import 3517 normOuter = types.erasure(ownOuter); 3518 if (normOuter != ownOuter) 3519 owntype = new ClassType( 3520 normOuter, List.<Type>nil(), owntype.tsym, 3521 owntype.getMetadata()); 3522 } 3523 } 3524 break; 3525 case VAR: 3526 VarSymbol v = (VarSymbol)sym; 3527 // Test (4): if symbol is an instance field of a raw type, 3528 // which is being assigned to, issue an unchecked warning if 3529 // its type changes under erasure. 3530 if (resultInfo.pkind == KindSelector.VAR && 3531 v.owner.kind == TYP && 3532 (v.flags() & STATIC) == 0 && 3533 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3534 Type s = types.asOuterSuper(site, v.owner); 3535 if (s != null && 3536 s.isRaw() && 3537 !types.isSameType(v.type, v.erasure(types))) { 3538 chk.warnUnchecked(tree.pos(), 3539 "unchecked.assign.to.var", 3540 v, s); 3541 } 3542 } 3543 // The computed type of a variable is the type of the 3544 // variable symbol, taken as a member of the site type. 3545 owntype = (sym.owner.kind == TYP && 3546 sym.name != names._this && sym.name != names._super) 3547 ? types.memberType(site, sym) 3548 : sym.type; 3549 3550 // If the variable is a constant, record constant value in 3551 // computed type. 3552 if (v.getConstValue() != null && isStaticReference(tree)) 3553 owntype = owntype.constType(v.getConstValue()); 3554 3555 if (resultInfo.pkind == KindSelector.VAL) { 3556 owntype = capture(owntype); // capture "names as expressions" 3557 } 3558 break; 3559 case MTH: { 3560 owntype = checkMethod(site, sym, 3561 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3562 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3563 resultInfo.pt.getTypeArguments()); 3564 break; 3565 } 3566 case PCK: case ERR: 3567 owntype = sym.type; 3568 break; 3569 default: 3570 throw new AssertionError("unexpected kind: " + sym.kind + 3571 " in tree " + tree); 3572 } 3573 3574 // Test (1): emit a `deprecation' warning if symbol is deprecated. 3575 // (for constructors, the error was given when the constructor was 3576 // resolved) 3577 3578 if (sym.name != names.init) { 3579 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3580 chk.checkSunAPI(tree.pos(), sym); 3581 chk.checkProfile(tree.pos(), sym); 3582 } 3583 3584 // Test (3): if symbol is a variable, check that its type and 3585 // kind are compatible with the prototype and protokind. 3586 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3587 } 3588 3589 /** Check that variable is initialized and evaluate the variable's 3590 * initializer, if not yet done. Also check that variable is not 3591 * referenced before it is defined. 3592 * @param tree The tree making up the variable reference. 3593 * @param env The current environment. 3594 * @param v The variable's symbol. 3595 */ 3596 private void checkInit(JCTree tree, 3597 Env<AttrContext> env, 3598 VarSymbol v, 3599 boolean onlyWarning) { 3600// System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " + 3601// tree.pos + " " + v.pos + " " + 3602// Resolve.isStatic(env));//DEBUG 3603 3604 // A forward reference is diagnosed if the declaration position 3605 // of the variable is greater than the current tree position 3606 // and the tree and variable definition occur in the same class 3607 // definition. Note that writes don't count as references. 3608 // This check applies only to class and instance 3609 // variables. Local variables follow different scope rules, 3610 // and are subject to definite assignment checking. 3611 if ((env.info.enclVar == v || v.pos > tree.pos) && 3612 v.owner.kind == TYP && 3613 enclosingInitEnv(env) != null && 3614 v.owner == env.info.scope.owner.enclClass() && 3615 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3616 (!env.tree.hasTag(ASSIGN) || 3617 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3618 String suffix = (env.info.enclVar == v) ? 3619 "self.ref" : "forward.ref"; 3620 if (!onlyWarning || isStaticEnumField(v)) { 3621 log.error(tree.pos(), "illegal." + suffix); 3622 } else if (useBeforeDeclarationWarning) { 3623 log.warning(tree.pos(), suffix, v); 3624 } 3625 } 3626 3627 v.getConstValue(); // ensure initializer is evaluated 3628 3629 checkEnumInitializer(tree, env, v); 3630 } 3631 3632 /** 3633 * Returns the enclosing init environment associated with this env (if any). An init env 3634 * can be either a field declaration env or a static/instance initializer env. 3635 */ 3636 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3637 while (true) { 3638 switch (env.tree.getTag()) { 3639 case VARDEF: 3640 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3641 if (vdecl.sym.owner.kind == TYP) { 3642 //field 3643 return env; 3644 } 3645 break; 3646 case BLOCK: 3647 if (env.next.tree.hasTag(CLASSDEF)) { 3648 //instance/static initializer 3649 return env; 3650 } 3651 break; 3652 case METHODDEF: 3653 case CLASSDEF: 3654 case TOPLEVEL: 3655 return null; 3656 } 3657 Assert.checkNonNull(env.next); 3658 env = env.next; 3659 } 3660 } 3661 3662 /** 3663 * Check for illegal references to static members of enum. In 3664 * an enum type, constructors and initializers may not 3665 * reference its static members unless they are constant. 3666 * 3667 * @param tree The tree making up the variable reference. 3668 * @param env The current environment. 3669 * @param v The variable's symbol. 3670 * @jls section 8.9 Enums 3671 */ 3672 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3673 // JLS: 3674 // 3675 // "It is a compile-time error to reference a static field 3676 // of an enum type that is not a compile-time constant 3677 // (15.28) from constructors, instance initializer blocks, 3678 // or instance variable initializer expressions of that 3679 // type. It is a compile-time error for the constructors, 3680 // instance initializer blocks, or instance variable 3681 // initializer expressions of an enum constant e to refer 3682 // to itself or to an enum constant of the same type that 3683 // is declared to the right of e." 3684 if (isStaticEnumField(v)) { 3685 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3686 3687 if (enclClass == null || enclClass.owner == null) 3688 return; 3689 3690 // See if the enclosing class is the enum (or a 3691 // subclass thereof) declaring v. If not, this 3692 // reference is OK. 3693 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3694 return; 3695 3696 // If the reference isn't from an initializer, then 3697 // the reference is OK. 3698 if (!Resolve.isInitializer(env)) 3699 return; 3700 3701 log.error(tree.pos(), "illegal.enum.static.ref"); 3702 } 3703 } 3704 3705 /** Is the given symbol a static, non-constant field of an Enum? 3706 * Note: enum literals should not be regarded as such 3707 */ 3708 private boolean isStaticEnumField(VarSymbol v) { 3709 return Flags.isEnum(v.owner) && 3710 Flags.isStatic(v) && 3711 !Flags.isConstant(v) && 3712 v.name != names._class; 3713 } 3714 3715 Warner noteWarner = new Warner(); 3716 3717 /** 3718 * Check that method arguments conform to its instantiation. 3719 **/ 3720 public Type checkMethod(Type site, 3721 final Symbol sym, 3722 ResultInfo resultInfo, 3723 Env<AttrContext> env, 3724 final List<JCExpression> argtrees, 3725 List<Type> argtypes, 3726 List<Type> typeargtypes) { 3727 // Test (5): if symbol is an instance method of a raw type, issue 3728 // an unchecked warning if its argument types change under erasure. 3729 if ((sym.flags() & STATIC) == 0 && 3730 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3731 Type s = types.asOuterSuper(site, sym.owner); 3732 if (s != null && s.isRaw() && 3733 !types.isSameTypes(sym.type.getParameterTypes(), 3734 sym.erasure(types).getParameterTypes())) { 3735 chk.warnUnchecked(env.tree.pos(), 3736 "unchecked.call.mbr.of.raw.type", 3737 sym, s); 3738 } 3739 } 3740 3741 if (env.info.defaultSuperCallSite != null) { 3742 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3743 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3744 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3745 List<MethodSymbol> icand_sup = 3746 types.interfaceCandidates(sup, (MethodSymbol)sym); 3747 if (icand_sup.nonEmpty() && 3748 icand_sup.head != sym && 3749 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3750 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3751 diags.fragment("overridden.default", sym, sup)); 3752 break; 3753 } 3754 } 3755 env.info.defaultSuperCallSite = null; 3756 } 3757 3758 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3759 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3760 if (app.meth.hasTag(SELECT) && 3761 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3762 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3763 } 3764 } 3765 3766 // Compute the identifier's instantiated type. 3767 // For methods, we need to compute the instance type by 3768 // Resolve.instantiate from the symbol's type as well as 3769 // any type arguments and value arguments. 3770 noteWarner.clear(); 3771 try { 3772 Type owntype = rs.checkMethod( 3773 env, 3774 site, 3775 sym, 3776 resultInfo, 3777 argtypes, 3778 typeargtypes, 3779 noteWarner); 3780 3781 DeferredAttr.DeferredTypeMap checkDeferredMap = 3782 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3783 3784 argtypes = Type.map(argtypes, checkDeferredMap); 3785 3786 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3787 chk.warnUnchecked(env.tree.pos(), 3788 "unchecked.meth.invocation.applied", 3789 kindName(sym), 3790 sym.name, 3791 rs.methodArguments(sym.type.getParameterTypes()), 3792 rs.methodArguments(Type.map(argtypes, checkDeferredMap)), 3793 kindName(sym.location()), 3794 sym.location()); 3795 owntype = new MethodType(owntype.getParameterTypes(), 3796 types.erasure(owntype.getReturnType()), 3797 types.erasure(owntype.getThrownTypes()), 3798 syms.methodClass); 3799 } 3800 3801 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 3802 resultInfo.checkContext.inferenceContext()); 3803 } catch (Infer.InferenceException ex) { 3804 //invalid target type - propagate exception outwards or report error 3805 //depending on the current check context 3806 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 3807 return types.createErrorType(site); 3808 } catch (Resolve.InapplicableMethodException ex) { 3809 final JCDiagnostic diag = ex.getDiagnostic(); 3810 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 3811 @Override 3812 protected Pair<Symbol, JCDiagnostic> errCandidate() { 3813 return new Pair<>(sym, diag); 3814 } 3815 }; 3816 List<Type> argtypes2 = Type.map(argtypes, 3817 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3818 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 3819 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 3820 log.report(errDiag); 3821 return types.createErrorType(site); 3822 } 3823 } 3824 3825 public void visitLiteral(JCLiteral tree) { 3826 result = check(tree, litType(tree.typetag).constType(tree.value), 3827 KindSelector.VAL, resultInfo); 3828 } 3829 //where 3830 /** Return the type of a literal with given type tag. 3831 */ 3832 Type litType(TypeTag tag) { 3833 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 3834 } 3835 3836 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 3837 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 3838 } 3839 3840 public void visitTypeArray(JCArrayTypeTree tree) { 3841 Type etype = attribType(tree.elemtype, env); 3842 Type type = new ArrayType(etype, syms.arrayClass); 3843 result = check(tree, type, KindSelector.TYP, resultInfo); 3844 } 3845 3846 /** Visitor method for parameterized types. 3847 * Bound checking is left until later, since types are attributed 3848 * before supertype structure is completely known 3849 */ 3850 public void visitTypeApply(JCTypeApply tree) { 3851 Type owntype = types.createErrorType(tree.type); 3852 3853 // Attribute functor part of application and make sure it's a class. 3854 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 3855 3856 // Attribute type parameters 3857 List<Type> actuals = attribTypes(tree.arguments, env); 3858 3859 if (clazztype.hasTag(CLASS)) { 3860 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 3861 if (actuals.isEmpty()) //diamond 3862 actuals = formals; 3863 3864 if (actuals.length() == formals.length()) { 3865 List<Type> a = actuals; 3866 List<Type> f = formals; 3867 while (a.nonEmpty()) { 3868 a.head = a.head.withTypeVar(f.head); 3869 a = a.tail; 3870 f = f.tail; 3871 } 3872 // Compute the proper generic outer 3873 Type clazzOuter = clazztype.getEnclosingType(); 3874 if (clazzOuter.hasTag(CLASS)) { 3875 Type site; 3876 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 3877 if (clazz.hasTag(IDENT)) { 3878 site = env.enclClass.sym.type; 3879 } else if (clazz.hasTag(SELECT)) { 3880 site = ((JCFieldAccess) clazz).selected.type; 3881 } else throw new AssertionError(""+tree); 3882 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 3883 if (site.hasTag(CLASS)) 3884 site = types.asOuterSuper(site, clazzOuter.tsym); 3885 if (site == null) 3886 site = types.erasure(clazzOuter); 3887 clazzOuter = site; 3888 } 3889 } 3890 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 3891 clazztype.getMetadata()); 3892 } else { 3893 if (formals.length() != 0) { 3894 log.error(tree.pos(), "wrong.number.type.args", 3895 Integer.toString(formals.length())); 3896 } else { 3897 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 3898 } 3899 owntype = types.createErrorType(tree.type); 3900 } 3901 } 3902 result = check(tree, owntype, KindSelector.TYP, resultInfo); 3903 } 3904 3905 public void visitTypeUnion(JCTypeUnion tree) { 3906 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 3907 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 3908 for (JCExpression typeTree : tree.alternatives) { 3909 Type ctype = attribType(typeTree, env); 3910 ctype = chk.checkType(typeTree.pos(), 3911 chk.checkClassType(typeTree.pos(), ctype), 3912 syms.throwableType); 3913 if (!ctype.isErroneous()) { 3914 //check that alternatives of a union type are pairwise 3915 //unrelated w.r.t. subtyping 3916 if (chk.intersects(ctype, multicatchTypes.toList())) { 3917 for (Type t : multicatchTypes) { 3918 boolean sub = types.isSubtype(ctype, t); 3919 boolean sup = types.isSubtype(t, ctype); 3920 if (sub || sup) { 3921 //assume 'a' <: 'b' 3922 Type a = sub ? ctype : t; 3923 Type b = sub ? t : ctype; 3924 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 3925 } 3926 } 3927 } 3928 multicatchTypes.append(ctype); 3929 if (all_multicatchTypes != null) 3930 all_multicatchTypes.append(ctype); 3931 } else { 3932 if (all_multicatchTypes == null) { 3933 all_multicatchTypes = new ListBuffer<>(); 3934 all_multicatchTypes.appendList(multicatchTypes); 3935 } 3936 all_multicatchTypes.append(ctype); 3937 } 3938 } 3939 Type t = check(tree, types.lub(multicatchTypes.toList()), 3940 KindSelector.TYP, resultInfo); 3941 if (t.hasTag(CLASS)) { 3942 List<Type> alternatives = 3943 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 3944 t = new UnionClassType((ClassType) t, alternatives); 3945 } 3946 tree.type = result = t; 3947 } 3948 3949 public void visitTypeIntersection(JCTypeIntersection tree) { 3950 attribTypes(tree.bounds, env); 3951 tree.type = result = checkIntersection(tree, tree.bounds); 3952 } 3953 3954 public void visitTypeParameter(JCTypeParameter tree) { 3955 TypeVar typeVar = (TypeVar) tree.type; 3956 3957 if (tree.annotations != null && tree.annotations.nonEmpty()) { 3958 annotateType(tree, tree.annotations); 3959 } 3960 3961 if (!typeVar.bound.isErroneous()) { 3962 //fixup type-parameter bound computed in 'attribTypeVariables' 3963 typeVar.bound = checkIntersection(tree, tree.bounds); 3964 } 3965 } 3966 3967 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 3968 Set<Type> boundSet = new HashSet<>(); 3969 if (bounds.nonEmpty()) { 3970 // accept class or interface or typevar as first bound. 3971 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 3972 boundSet.add(types.erasure(bounds.head.type)); 3973 if (bounds.head.type.isErroneous()) { 3974 return bounds.head.type; 3975 } 3976 else if (bounds.head.type.hasTag(TYPEVAR)) { 3977 // if first bound was a typevar, do not accept further bounds. 3978 if (bounds.tail.nonEmpty()) { 3979 log.error(bounds.tail.head.pos(), 3980 "type.var.may.not.be.followed.by.other.bounds"); 3981 return bounds.head.type; 3982 } 3983 } else { 3984 // if first bound was a class or interface, accept only interfaces 3985 // as further bounds. 3986 for (JCExpression bound : bounds.tail) { 3987 bound.type = checkBase(bound.type, bound, env, false, true, false); 3988 if (bound.type.isErroneous()) { 3989 bounds = List.of(bound); 3990 } 3991 else if (bound.type.hasTag(CLASS)) { 3992 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 3993 } 3994 } 3995 } 3996 } 3997 3998 if (bounds.length() == 0) { 3999 return syms.objectType; 4000 } else if (bounds.length() == 1) { 4001 return bounds.head.type; 4002 } else { 4003 Type owntype = types.makeCompoundType(TreeInfo.types(bounds)); 4004 // ... the variable's bound is a class type flagged COMPOUND 4005 // (see comment for TypeVar.bound). 4006 // In this case, generate a class tree that represents the 4007 // bound class, ... 4008 JCExpression extending; 4009 List<JCExpression> implementing; 4010 if (!bounds.head.type.isInterface()) { 4011 extending = bounds.head; 4012 implementing = bounds.tail; 4013 } else { 4014 extending = null; 4015 implementing = bounds; 4016 } 4017 JCClassDecl cd = make.at(tree).ClassDef( 4018 make.Modifiers(PUBLIC | ABSTRACT), 4019 names.empty, List.<JCTypeParameter>nil(), 4020 extending, implementing, List.<JCTree>nil()); 4021 4022 ClassSymbol c = (ClassSymbol)owntype.tsym; 4023 Assert.check((c.flags() & COMPOUND) != 0); 4024 cd.sym = c; 4025 c.sourcefile = env.toplevel.sourcefile; 4026 4027 // ... and attribute the bound class 4028 c.flags_field |= UNATTRIBUTED; 4029 Env<AttrContext> cenv = enter.classEnv(cd, env); 4030 typeEnvs.put(c, cenv); 4031 attribClass(c); 4032 return owntype; 4033 } 4034 } 4035 4036 public void visitWildcard(JCWildcard tree) { 4037 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4038 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4039 ? syms.objectType 4040 : attribType(tree.inner, env); 4041 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4042 tree.kind.kind, 4043 syms.boundClass), 4044 KindSelector.TYP, resultInfo); 4045 } 4046 4047 public void visitAnnotation(JCAnnotation tree) { 4048 Assert.error("should be handled in Annotate"); 4049 } 4050 4051 public void visitAnnotatedType(JCAnnotatedType tree) { 4052 Type underlyingType = attribType(tree.getUnderlyingType(), env); 4053 this.attribAnnotationTypes(tree.annotations, env); 4054 annotateType(tree, tree.annotations); 4055 result = tree.type = underlyingType; 4056 } 4057 4058 /** 4059 * Apply the annotations to the particular type. 4060 */ 4061 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) { 4062 annotate.typeAnnotation(new Annotate.Worker() { 4063 @Override 4064 public String toString() { 4065 return "annotate " + annotations + " onto " + tree; 4066 } 4067 @Override 4068 public void run() { 4069 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations); 4070 Assert.check(annotations.size() == compounds.size()); 4071 tree.type = tree.type.annotatedType(compounds); 4072 } 4073 }); 4074 } 4075 4076 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) { 4077 if (annotations.isEmpty()) { 4078 return List.nil(); 4079 } 4080 4081 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>(); 4082 for (JCAnnotation anno : annotations) { 4083 Assert.checkNonNull(anno.attribute); 4084 buf.append((Attribute.TypeCompound) anno.attribute); 4085 } 4086 return buf.toList(); 4087 } 4088 4089 public void visitErroneous(JCErroneous tree) { 4090 if (tree.errs != null) 4091 for (JCTree err : tree.errs) 4092 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4093 result = tree.type = syms.errType; 4094 } 4095 4096 /** Default visitor method for all other trees. 4097 */ 4098 public void visitTree(JCTree tree) { 4099 throw new AssertionError(); 4100 } 4101 4102 /** 4103 * Attribute an env for either a top level tree or class declaration. 4104 */ 4105 public void attrib(Env<AttrContext> env) { 4106 if (env.tree.hasTag(TOPLEVEL)) 4107 attribTopLevel(env); 4108 else 4109 attribClass(env.tree.pos(), env.enclClass.sym); 4110 } 4111 4112 /** 4113 * Attribute a top level tree. These trees are encountered when the 4114 * package declaration has annotations. 4115 */ 4116 public void attribTopLevel(Env<AttrContext> env) { 4117 JCCompilationUnit toplevel = env.toplevel; 4118 try { 4119 annotate.flush(); 4120 } catch (CompletionFailure ex) { 4121 chk.completionError(toplevel.pos(), ex); 4122 } 4123 } 4124 4125 /** Main method: attribute class definition associated with given class symbol. 4126 * reporting completion failures at the given position. 4127 * @param pos The source position at which completion errors are to be 4128 * reported. 4129 * @param c The class symbol whose definition will be attributed. 4130 */ 4131 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4132 try { 4133 annotate.flush(); 4134 attribClass(c); 4135 } catch (CompletionFailure ex) { 4136 chk.completionError(pos, ex); 4137 } 4138 } 4139 4140 /** Attribute class definition associated with given class symbol. 4141 * @param c The class symbol whose definition will be attributed. 4142 */ 4143 void attribClass(ClassSymbol c) throws CompletionFailure { 4144 if (c.type.hasTag(ERROR)) return; 4145 4146 // Check for cycles in the inheritance graph, which can arise from 4147 // ill-formed class files. 4148 chk.checkNonCyclic(null, c.type); 4149 4150 Type st = types.supertype(c.type); 4151 if ((c.flags_field & Flags.COMPOUND) == 0) { 4152 // First, attribute superclass. 4153 if (st.hasTag(CLASS)) 4154 attribClass((ClassSymbol)st.tsym); 4155 4156 // Next attribute owner, if it is a class. 4157 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4158 attribClass((ClassSymbol)c.owner); 4159 } 4160 4161 // The previous operations might have attributed the current class 4162 // if there was a cycle. So we test first whether the class is still 4163 // UNATTRIBUTED. 4164 if ((c.flags_field & UNATTRIBUTED) != 0) { 4165 c.flags_field &= ~UNATTRIBUTED; 4166 4167 // Get environment current at the point of class definition. 4168 Env<AttrContext> env = typeEnvs.get(c); 4169 4170 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4171 // because the annotations were not available at the time the env was created. Therefore, 4172 // we look up the environment chain for the first enclosing environment for which the 4173 // lint value is set. Typically, this is the parent env, but might be further if there 4174 // are any envs created as a result of TypeParameter nodes. 4175 Env<AttrContext> lintEnv = env; 4176 while (lintEnv.info.lint == null) 4177 lintEnv = lintEnv.next; 4178 4179 // Having found the enclosing lint value, we can initialize the lint value for this class 4180 env.info.lint = lintEnv.info.lint.augment(c); 4181 4182 Lint prevLint = chk.setLint(env.info.lint); 4183 JavaFileObject prev = log.useSource(c.sourcefile); 4184 ResultInfo prevReturnRes = env.info.returnResult; 4185 4186 try { 4187 deferredLintHandler.flush(env.tree); 4188 env.info.returnResult = null; 4189 // java.lang.Enum may not be subclassed by a non-enum 4190 if (st.tsym == syms.enumSym && 4191 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4192 log.error(env.tree.pos(), "enum.no.subclassing"); 4193 4194 // Enums may not be extended by source-level classes 4195 if (st.tsym != null && 4196 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4197 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4198 log.error(env.tree.pos(), "enum.types.not.extensible"); 4199 } 4200 4201 if (isSerializable(c.type)) { 4202 env.info.isSerializable = true; 4203 } 4204 4205 attribClassBody(env, c); 4206 4207 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4208 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4209 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4210 } finally { 4211 env.info.returnResult = prevReturnRes; 4212 log.useSource(prev); 4213 chk.setLint(prevLint); 4214 } 4215 4216 } 4217 } 4218 4219 public void visitImport(JCImport tree) { 4220 // nothing to do 4221 } 4222 4223 /** Finish the attribution of a class. */ 4224 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4225 JCClassDecl tree = (JCClassDecl)env.tree; 4226 Assert.check(c == tree.sym); 4227 4228 // Validate type parameters, supertype and interfaces. 4229 attribStats(tree.typarams, env); 4230 if (!c.isAnonymous()) { 4231 //already checked if anonymous 4232 chk.validate(tree.typarams, env); 4233 chk.validate(tree.extending, env); 4234 chk.validate(tree.implementing, env); 4235 } 4236 4237 // If this is a non-abstract class, check that it has no abstract 4238 // methods or unimplemented methods of an implemented interface. 4239 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4240 if (!relax) 4241 chk.checkAllDefined(tree.pos(), c); 4242 } 4243 4244 if ((c.flags() & ANNOTATION) != 0) { 4245 if (tree.implementing.nonEmpty()) 4246 log.error(tree.implementing.head.pos(), 4247 "cant.extend.intf.annotation"); 4248 if (tree.typarams.nonEmpty()) 4249 log.error(tree.typarams.head.pos(), 4250 "intf.annotation.cant.have.type.params"); 4251 4252 // If this annotation has a @Repeatable, validate 4253 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym); 4254 if (repeatable != null) { 4255 // get diagnostic position for error reporting 4256 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4257 Assert.checkNonNull(cbPos); 4258 4259 chk.validateRepeatable(c, repeatable, cbPos); 4260 } 4261 } else { 4262 // Check that all extended classes and interfaces 4263 // are compatible (i.e. no two define methods with same arguments 4264 // yet different return types). (JLS 8.4.6.3) 4265 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4266 if (allowDefaultMethods) { 4267 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4268 } 4269 } 4270 4271 // Check that class does not import the same parameterized interface 4272 // with two different argument lists. 4273 chk.checkClassBounds(tree.pos(), c.type); 4274 4275 tree.type = c.type; 4276 4277 for (List<JCTypeParameter> l = tree.typarams; 4278 l.nonEmpty(); l = l.tail) { 4279 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4280 } 4281 4282 // Check that a generic class doesn't extend Throwable 4283 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4284 log.error(tree.extending.pos(), "generic.throwable"); 4285 4286 // Check that all methods which implement some 4287 // method conform to the method they implement. 4288 chk.checkImplementations(tree); 4289 4290 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4291 checkAutoCloseable(tree.pos(), env, c.type); 4292 4293 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4294 // Attribute declaration 4295 attribStat(l.head, env); 4296 // Check that declarations in inner classes are not static (JLS 8.1.2) 4297 // Make an exception for static constants. 4298 if (c.owner.kind != PCK && 4299 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4300 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4301 Symbol sym = null; 4302 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4303 if (sym == null || 4304 sym.kind != VAR || 4305 ((VarSymbol) sym).getConstValue() == null) 4306 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4307 } 4308 } 4309 4310 // Check for cycles among non-initial constructors. 4311 chk.checkCyclicConstructors(tree); 4312 4313 // Check for cycles among annotation elements. 4314 chk.checkNonCyclicElements(tree); 4315 4316 // Check for proper use of serialVersionUID 4317 if (env.info.lint.isEnabled(LintCategory.SERIAL) && 4318 isSerializable(c.type) && 4319 (c.flags() & Flags.ENUM) == 0 && 4320 checkForSerial(c)) { 4321 checkSerialVersionUID(tree, c); 4322 } 4323 if (allowTypeAnnos) { 4324 // Correctly organize the postions of the type annotations 4325 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4326 4327 // Check type annotations applicability rules 4328 validateTypeAnnotations(tree, false); 4329 } 4330 } 4331 // where 4332 boolean checkForSerial(ClassSymbol c) { 4333 if ((c.flags() & ABSTRACT) == 0) { 4334 return true; 4335 } else { 4336 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4337 } 4338 } 4339 4340 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() { 4341 @Override 4342 public boolean accepts(Symbol s) { 4343 return s.kind == MTH && 4344 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4345 } 4346 }; 4347 4348 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4349 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4350 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4351 if (types.isSameType(al.head.annotationType.type, t)) 4352 return al.head.pos(); 4353 } 4354 4355 return null; 4356 } 4357 4358 /** check if a type is a subtype of Serializable, if that is available. */ 4359 boolean isSerializable(Type t) { 4360 try { 4361 syms.serializableType.complete(); 4362 } 4363 catch (CompletionFailure e) { 4364 return false; 4365 } 4366 return types.isSubtype(t, syms.serializableType); 4367 } 4368 4369 /** Check that an appropriate serialVersionUID member is defined. */ 4370 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4371 4372 // check for presence of serialVersionUID 4373 VarSymbol svuid = null; 4374 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4375 if (sym.kind == VAR) { 4376 svuid = (VarSymbol)sym; 4377 break; 4378 } 4379 } 4380 4381 if (svuid == null) { 4382 log.warning(LintCategory.SERIAL, 4383 tree.pos(), "missing.SVUID", c); 4384 return; 4385 } 4386 4387 // check that it is static final 4388 if ((svuid.flags() & (STATIC | FINAL)) != 4389 (STATIC | FINAL)) 4390 log.warning(LintCategory.SERIAL, 4391 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4392 4393 // check that it is long 4394 else if (!svuid.type.hasTag(LONG)) 4395 log.warning(LintCategory.SERIAL, 4396 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4397 4398 // check constant 4399 else if (svuid.getConstValue() == null) 4400 log.warning(LintCategory.SERIAL, 4401 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4402 } 4403 4404 private Type capture(Type type) { 4405 return types.capture(type); 4406 } 4407 4408 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4409 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4410 } 4411 //where 4412 private final class TypeAnnotationsValidator extends TreeScanner { 4413 4414 private final boolean sigOnly; 4415 public TypeAnnotationsValidator(boolean sigOnly) { 4416 this.sigOnly = sigOnly; 4417 } 4418 4419 public void visitAnnotation(JCAnnotation tree) { 4420 chk.validateTypeAnnotation(tree, false); 4421 super.visitAnnotation(tree); 4422 } 4423 public void visitAnnotatedType(JCAnnotatedType tree) { 4424 if (!tree.underlyingType.type.isErroneous()) { 4425 super.visitAnnotatedType(tree); 4426 } 4427 } 4428 public void visitTypeParameter(JCTypeParameter tree) { 4429 chk.validateTypeAnnotations(tree.annotations, true); 4430 scan(tree.bounds); 4431 // Don't call super. 4432 // This is needed because above we call validateTypeAnnotation with 4433 // false, which would forbid annotations on type parameters. 4434 // super.visitTypeParameter(tree); 4435 } 4436 public void visitMethodDef(JCMethodDecl tree) { 4437 if (tree.recvparam != null && 4438 !tree.recvparam.vartype.type.isErroneous()) { 4439 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4440 tree.recvparam.vartype.type.tsym); 4441 } 4442 if (tree.restype != null && tree.restype.type != null) { 4443 validateAnnotatedType(tree.restype, tree.restype.type); 4444 } 4445 if (sigOnly) { 4446 scan(tree.mods); 4447 scan(tree.restype); 4448 scan(tree.typarams); 4449 scan(tree.recvparam); 4450 scan(tree.params); 4451 scan(tree.thrown); 4452 } else { 4453 scan(tree.defaultValue); 4454 scan(tree.body); 4455 } 4456 } 4457 public void visitVarDef(final JCVariableDecl tree) { 4458 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4459 if (tree.sym != null && tree.sym.type != null) 4460 validateAnnotatedType(tree.vartype, tree.sym.type); 4461 scan(tree.mods); 4462 scan(tree.vartype); 4463 if (!sigOnly) { 4464 scan(tree.init); 4465 } 4466 } 4467 public void visitTypeCast(JCTypeCast tree) { 4468 if (tree.clazz != null && tree.clazz.type != null) 4469 validateAnnotatedType(tree.clazz, tree.clazz.type); 4470 super.visitTypeCast(tree); 4471 } 4472 public void visitTypeTest(JCInstanceOf tree) { 4473 if (tree.clazz != null && tree.clazz.type != null) 4474 validateAnnotatedType(tree.clazz, tree.clazz.type); 4475 super.visitTypeTest(tree); 4476 } 4477 public void visitNewClass(JCNewClass tree) { 4478 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4479 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4480 tree.clazz.type.tsym); 4481 } 4482 if (tree.def != null) { 4483 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4484 } 4485 if (tree.clazz.type != null) { 4486 validateAnnotatedType(tree.clazz, tree.clazz.type); 4487 } 4488 super.visitNewClass(tree); 4489 } 4490 public void visitNewArray(JCNewArray tree) { 4491 if (tree.elemtype != null && tree.elemtype.type != null) { 4492 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4493 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4494 tree.elemtype.type.tsym); 4495 } 4496 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4497 } 4498 super.visitNewArray(tree); 4499 } 4500 public void visitClassDef(JCClassDecl tree) { 4501 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4502 if (sigOnly) { 4503 scan(tree.mods); 4504 scan(tree.typarams); 4505 scan(tree.extending); 4506 scan(tree.implementing); 4507 } 4508 for (JCTree member : tree.defs) { 4509 if (member.hasTag(Tag.CLASSDEF)) { 4510 continue; 4511 } 4512 scan(member); 4513 } 4514 } 4515 public void visitBlock(JCBlock tree) { 4516 if (!sigOnly) { 4517 scan(tree.stats); 4518 } 4519 } 4520 4521 /* I would want to model this after 4522 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4523 * and override visitSelect and visitTypeApply. 4524 * However, we only set the annotated type in the top-level type 4525 * of the symbol. 4526 * Therefore, we need to override each individual location where a type 4527 * can occur. 4528 */ 4529 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4530 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4531 4532 if (type.isPrimitiveOrVoid()) { 4533 return; 4534 } 4535 4536 JCTree enclTr = errtree; 4537 Type enclTy = type; 4538 4539 boolean repeat = true; 4540 while (repeat) { 4541 if (enclTr.hasTag(TYPEAPPLY)) { 4542 List<Type> tyargs = enclTy.getTypeArguments(); 4543 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4544 if (trargs.length() > 0) { 4545 // Nothing to do for diamonds 4546 if (tyargs.length() == trargs.length()) { 4547 for (int i = 0; i < tyargs.length(); ++i) { 4548 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4549 } 4550 } 4551 // If the lengths don't match, it's either a diamond 4552 // or some nested type that redundantly provides 4553 // type arguments in the tree. 4554 } 4555 4556 // Look at the clazz part of a generic type 4557 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4558 } 4559 4560 if (enclTr.hasTag(SELECT)) { 4561 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4562 if (enclTy != null && 4563 !enclTy.hasTag(NONE)) { 4564 enclTy = enclTy.getEnclosingType(); 4565 } 4566 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4567 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4568 if (enclTy == null || enclTy.hasTag(NONE)) { 4569 if (at.getAnnotations().size() == 1) { 4570 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4571 } else { 4572 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4573 for (JCAnnotation an : at.getAnnotations()) { 4574 comps.add(an.attribute); 4575 } 4576 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4577 } 4578 repeat = false; 4579 } 4580 enclTr = at.underlyingType; 4581 // enclTy doesn't need to be changed 4582 } else if (enclTr.hasTag(IDENT)) { 4583 repeat = false; 4584 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4585 JCWildcard wc = (JCWildcard) enclTr; 4586 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4587 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4588 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4589 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4590 } else { 4591 // Nothing to do for UNBOUND 4592 } 4593 repeat = false; 4594 } else if (enclTr.hasTag(TYPEARRAY)) { 4595 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4596 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4597 repeat = false; 4598 } else if (enclTr.hasTag(TYPEUNION)) { 4599 JCTypeUnion ut = (JCTypeUnion) enclTr; 4600 for (JCTree t : ut.getTypeAlternatives()) { 4601 validateAnnotatedType(t, t.type); 4602 } 4603 repeat = false; 4604 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4605 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4606 for (JCTree t : it.getBounds()) { 4607 validateAnnotatedType(t, t.type); 4608 } 4609 repeat = false; 4610 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4611 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4612 repeat = false; 4613 } else { 4614 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4615 " within: "+ errtree + " with kind: " + errtree.getKind()); 4616 } 4617 } 4618 } 4619 4620 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4621 Symbol sym) { 4622 // Ensure that no declaration annotations are present. 4623 // Note that a tree type might be an AnnotatedType with 4624 // empty annotations, if only declaration annotations were given. 4625 // This method will raise an error for such a type. 4626 for (JCAnnotation ai : annotations) { 4627 if (!ai.type.isErroneous() && 4628 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4629 log.error(ai.pos(), "annotation.type.not.applicable"); 4630 } 4631 } 4632 } 4633 } 4634 4635 // <editor-fold desc="post-attribution visitor"> 4636 4637 /** 4638 * Handle missing types/symbols in an AST. This routine is useful when 4639 * the compiler has encountered some errors (which might have ended up 4640 * terminating attribution abruptly); if the compiler is used in fail-over 4641 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4642 * prevents NPE to be progagated during subsequent compilation steps. 4643 */ 4644 public void postAttr(JCTree tree) { 4645 new PostAttrAnalyzer().scan(tree); 4646 } 4647 4648 class PostAttrAnalyzer extends TreeScanner { 4649 4650 private void initTypeIfNeeded(JCTree that) { 4651 if (that.type == null) { 4652 if (that.hasTag(METHODDEF)) { 4653 that.type = dummyMethodType((JCMethodDecl)that); 4654 } else { 4655 that.type = syms.unknownType; 4656 } 4657 } 4658 } 4659 4660 /* Construct a dummy method type. If we have a method declaration, 4661 * and the declared return type is void, then use that return type 4662 * instead of UNKNOWN to avoid spurious error messages in lambda 4663 * bodies (see:JDK-8041704). 4664 */ 4665 private Type dummyMethodType(JCMethodDecl md) { 4666 Type restype = syms.unknownType; 4667 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4668 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4669 if (prim.typetag == VOID) 4670 restype = syms.voidType; 4671 } 4672 return new MethodType(List.<Type>nil(), restype, 4673 List.<Type>nil(), syms.methodClass); 4674 } 4675 private Type dummyMethodType() { 4676 return dummyMethodType(null); 4677 } 4678 4679 @Override 4680 public void scan(JCTree tree) { 4681 if (tree == null) return; 4682 if (tree instanceof JCExpression) { 4683 initTypeIfNeeded(tree); 4684 } 4685 super.scan(tree); 4686 } 4687 4688 @Override 4689 public void visitIdent(JCIdent that) { 4690 if (that.sym == null) { 4691 that.sym = syms.unknownSymbol; 4692 } 4693 } 4694 4695 @Override 4696 public void visitSelect(JCFieldAccess that) { 4697 if (that.sym == null) { 4698 that.sym = syms.unknownSymbol; 4699 } 4700 super.visitSelect(that); 4701 } 4702 4703 @Override 4704 public void visitClassDef(JCClassDecl that) { 4705 initTypeIfNeeded(that); 4706 if (that.sym == null) { 4707 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4708 } 4709 super.visitClassDef(that); 4710 } 4711 4712 @Override 4713 public void visitMethodDef(JCMethodDecl that) { 4714 initTypeIfNeeded(that); 4715 if (that.sym == null) { 4716 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4717 } 4718 super.visitMethodDef(that); 4719 } 4720 4721 @Override 4722 public void visitVarDef(JCVariableDecl that) { 4723 initTypeIfNeeded(that); 4724 if (that.sym == null) { 4725 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4726 that.sym.adr = 0; 4727 } 4728 super.visitVarDef(that); 4729 } 4730 4731 @Override 4732 public void visitNewClass(JCNewClass that) { 4733 if (that.constructor == null) { 4734 that.constructor = new MethodSymbol(0, names.init, 4735 dummyMethodType(), syms.noSymbol); 4736 } 4737 if (that.constructorType == null) { 4738 that.constructorType = syms.unknownType; 4739 } 4740 super.visitNewClass(that); 4741 } 4742 4743 @Override 4744 public void visitAssignop(JCAssignOp that) { 4745 if (that.operator == null) { 4746 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4747 -1, syms.noSymbol); 4748 } 4749 super.visitAssignop(that); 4750 } 4751 4752 @Override 4753 public void visitBinary(JCBinary that) { 4754 if (that.operator == null) { 4755 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4756 -1, syms.noSymbol); 4757 } 4758 super.visitBinary(that); 4759 } 4760 4761 @Override 4762 public void visitUnary(JCUnary that) { 4763 if (that.operator == null) { 4764 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4765 -1, syms.noSymbol); 4766 } 4767 super.visitUnary(that); 4768 } 4769 4770 @Override 4771 public void visitLambda(JCLambda that) { 4772 super.visitLambda(that); 4773 if (that.targets == null) { 4774 that.targets = List.nil(); 4775 } 4776 } 4777 4778 @Override 4779 public void visitReference(JCMemberReference that) { 4780 super.visitReference(that); 4781 if (that.sym == null) { 4782 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 4783 syms.noSymbol); 4784 } 4785 if (that.targets == null) { 4786 that.targets = List.nil(); 4787 } 4788 } 4789 } 4790 // </editor-fold> 4791} 4792