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