Attr.java revision 2868:816bd88d33a8
1/* 2 * Copyright (c) 1999, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.tools.javac.comp; 27 28import java.util.*; 29 30import javax.lang.model.element.ElementKind; 31import javax.tools.JavaFileObject; 32 33import com.sun.source.tree.IdentifierTree; 34import com.sun.source.tree.MemberReferenceTree.ReferenceMode; 35import com.sun.source.tree.MemberSelectTree; 36import com.sun.source.tree.TreeVisitor; 37import com.sun.source.util.SimpleTreeVisitor; 38import com.sun.tools.javac.code.*; 39import com.sun.tools.javac.code.Lint.LintCategory; 40import com.sun.tools.javac.code.Scope.WriteableScope; 41import com.sun.tools.javac.code.Symbol.*; 42import com.sun.tools.javac.code.Type.*; 43import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError; 44import com.sun.tools.javac.comp.Check.CheckContext; 45import com.sun.tools.javac.comp.DeferredAttr.AttrMode; 46import com.sun.tools.javac.comp.Infer.InferenceContext; 47import com.sun.tools.javac.comp.Infer.FreeTypeListener; 48import com.sun.tools.javac.jvm.*; 49import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond; 50import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg; 51import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs; 52import com.sun.tools.javac.resources.CompilerProperties.Errors; 53import com.sun.tools.javac.resources.CompilerProperties.Fragments; 54import com.sun.tools.javac.tree.*; 55import com.sun.tools.javac.tree.JCTree.*; 56import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*; 57import com.sun.tools.javac.util.*; 58import com.sun.tools.javac.util.DefinedBy.Api; 59import com.sun.tools.javac.util.Dependencies.AttributionKind; 60import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition; 61import com.sun.tools.javac.util.JCDiagnostic.Fragment; 62import com.sun.tools.javac.util.List; 63import static com.sun.tools.javac.code.Flags.*; 64import static com.sun.tools.javac.code.Flags.ANNOTATION; 65import static com.sun.tools.javac.code.Flags.BLOCK; 66import static com.sun.tools.javac.code.Kinds.*; 67import static com.sun.tools.javac.code.Kinds.Kind.*; 68import static com.sun.tools.javac.code.TypeTag.*; 69import static com.sun.tools.javac.code.TypeTag.WILDCARD; 70import static com.sun.tools.javac.tree.JCTree.Tag.*; 71 72/** This is the main context-dependent analysis phase in GJC. It 73 * encompasses name resolution, type checking and constant folding as 74 * subtasks. Some subtasks involve auxiliary classes. 75 * @see Check 76 * @see Resolve 77 * @see ConstFold 78 * @see Infer 79 * 80 * <p><b>This is NOT part of any supported API. 81 * If you write code that depends on this, you do so at your own risk. 82 * This code and its internal interfaces are subject to change or 83 * deletion without notice.</b> 84 */ 85public class Attr extends JCTree.Visitor { 86 protected static final Context.Key<Attr> attrKey = new Context.Key<>(); 87 88 final Names names; 89 final Log log; 90 final Symtab syms; 91 final Resolve rs; 92 final Operators operators; 93 final Infer infer; 94 final Analyzer analyzer; 95 final DeferredAttr deferredAttr; 96 final Check chk; 97 final Flow flow; 98 final MemberEnter memberEnter; 99 final TypeEnter typeEnter; 100 final TreeMaker make; 101 final ConstFold cfolder; 102 final Enter enter; 103 final Target target; 104 final Types types; 105 final JCDiagnostic.Factory diags; 106 final Annotate annotate; 107 final TypeAnnotations typeAnnotations; 108 final DeferredLintHandler deferredLintHandler; 109 final TypeEnvs typeEnvs; 110 final Dependencies dependencies; 111 112 public static Attr instance(Context context) { 113 Attr instance = context.get(attrKey); 114 if (instance == null) 115 instance = new Attr(context); 116 return instance; 117 } 118 119 protected Attr(Context context) { 120 context.put(attrKey, this); 121 122 names = Names.instance(context); 123 log = Log.instance(context); 124 syms = Symtab.instance(context); 125 rs = Resolve.instance(context); 126 operators = Operators.instance(context); 127 chk = Check.instance(context); 128 flow = Flow.instance(context); 129 memberEnter = MemberEnter.instance(context); 130 typeEnter = TypeEnter.instance(context); 131 make = TreeMaker.instance(context); 132 enter = Enter.instance(context); 133 infer = Infer.instance(context); 134 analyzer = Analyzer.instance(context); 135 deferredAttr = DeferredAttr.instance(context); 136 cfolder = ConstFold.instance(context); 137 target = Target.instance(context); 138 types = Types.instance(context); 139 diags = JCDiagnostic.Factory.instance(context); 140 annotate = Annotate.instance(context); 141 typeAnnotations = TypeAnnotations.instance(context); 142 deferredLintHandler = DeferredLintHandler.instance(context); 143 typeEnvs = TypeEnvs.instance(context); 144 dependencies = Dependencies.instance(context); 145 146 Options options = Options.instance(context); 147 148 Source source = Source.instance(context); 149 allowStringsInSwitch = source.allowStringsInSwitch(); 150 allowPoly = source.allowPoly(); 151 allowTypeAnnos = source.allowTypeAnnotations(); 152 allowLambda = source.allowLambda(); 153 allowDefaultMethods = source.allowDefaultMethods(); 154 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods(); 155 sourceName = source.name; 156 relax = (options.isSet("-retrofit") || 157 options.isSet("-relax")); 158 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning"); 159 160 statInfo = new ResultInfo(KindSelector.NIL, Type.noType); 161 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType); 162 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType); 163 unknownAnyPolyInfo = new ResultInfo(KindSelector.VAL, Infer.anyPoly); 164 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType); 165 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType); 166 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext); 167 168 noCheckTree = make.at(-1).Skip(); 169 } 170 171 /** Switch: relax some constraints for retrofit mode. 172 */ 173 boolean relax; 174 175 /** Switch: support target-typing inference 176 */ 177 boolean allowPoly; 178 179 /** Switch: support type annotations. 180 */ 181 boolean allowTypeAnnos; 182 183 /** Switch: support lambda expressions ? 184 */ 185 boolean allowLambda; 186 187 /** Switch: support default methods ? 188 */ 189 boolean allowDefaultMethods; 190 191 /** Switch: static interface methods enabled? 192 */ 193 boolean allowStaticInterfaceMethods; 194 195 /** 196 * Switch: warn about use of variable before declaration? 197 * RFE: 6425594 198 */ 199 boolean useBeforeDeclarationWarning; 200 201 /** 202 * Switch: allow strings in switch? 203 */ 204 boolean allowStringsInSwitch; 205 206 /** 207 * Switch: name of source level; used for error reporting. 208 */ 209 String sourceName; 210 211 /** Check kind and type of given tree against protokind and prototype. 212 * If check succeeds, store type in tree and return it. 213 * If check fails, store errType in tree and return it. 214 * No checks are performed if the prototype is a method type. 215 * It is not necessary in this case since we know that kind and type 216 * are correct. 217 * 218 * @param tree The tree whose kind and type is checked 219 * @param found The computed type of the tree 220 * @param ownkind The computed kind of the tree 221 * @param resultInfo The expected result of the tree 222 */ 223 Type check(final JCTree tree, 224 final Type found, 225 final KindSelector ownkind, 226 final ResultInfo resultInfo) { 227 return check(tree, found, ownkind, resultInfo, true); 228 } 229 /** Check kind and type of given tree against protokind and prototype. 230 * If check succeeds, store type in tree and return it. 231 * If check fails, store errType in tree and return it. 232 * No checks are performed if the prototype is a method type. 233 * It is not necessary in this case since we know that kind and type 234 * are correct. 235 * 236 * @param tree The tree whose kind and type is checked 237 * @param found The computed type of the tree 238 * @param ownkind The computed kind of the tree 239 * @param resultInfo The expected result of the tree 240 * @param recheckPostInference If true and inference is underway, arrange to recheck the tree after inference finishes. 241 */ 242 Type check(final JCTree tree, 243 final Type found, 244 final KindSelector ownkind, 245 final ResultInfo resultInfo, 246 boolean recheckPostInference) { 247 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 248 Type owntype; 249 boolean shouldCheck = !found.hasTag(ERROR) && 250 !resultInfo.pt.hasTag(METHOD) && 251 !resultInfo.pt.hasTag(FORALL); 252 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) { 253 log.error(tree.pos(), "unexpected.type", 254 resultInfo.pkind.kindNames(), 255 ownkind.kindNames()); 256 owntype = types.createErrorType(found); 257 } else if (allowPoly && inferenceContext.free(found)) { 258 //delay the check if there are inference variables in the found type 259 //this means we are dealing with a partially inferred poly expression 260 owntype = shouldCheck ? resultInfo.pt : found; 261 if (recheckPostInference) { 262 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), 263 instantiatedContext -> { 264 ResultInfo pendingResult = 265 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt)); 266 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult, false); 267 }); 268 } 269 } else { 270 owntype = shouldCheck ? 271 resultInfo.check(tree, found) : 272 found; 273 } 274 if (tree != noCheckTree) { 275 tree.type = owntype; 276 } 277 return owntype; 278 } 279 280 /** Is given blank final variable assignable, i.e. in a scope where it 281 * may be assigned to even though it is final? 282 * @param v The blank final variable. 283 * @param env The current environment. 284 */ 285 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) { 286 Symbol owner = env.info.scope.owner; 287 // owner refers to the innermost variable, method or 288 // initializer block declaration at this point. 289 return 290 v.owner == owner 291 || 292 ((owner.name == names.init || // i.e. we are in a constructor 293 owner.kind == VAR || // i.e. we are in a variable initializer 294 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block 295 && 296 v.owner == owner.owner 297 && 298 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env)); 299 } 300 301 /** Check that variable can be assigned to. 302 * @param pos The current source code position. 303 * @param v The assigned varaible 304 * @param base If the variable is referred to in a Select, the part 305 * to the left of the `.', null otherwise. 306 * @param env The current environment. 307 */ 308 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) { 309 if ((v.flags() & FINAL) != 0 && 310 ((v.flags() & HASINIT) != 0 311 || 312 !((base == null || 313 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) && 314 isAssignableAsBlankFinal(v, env)))) { 315 if (v.isResourceVariable()) { //TWR resource 316 log.error(pos, "try.resource.may.not.be.assigned", v); 317 } else { 318 log.error(pos, "cant.assign.val.to.final.var", v); 319 } 320 } 321 } 322 323 /** Does tree represent a static reference to an identifier? 324 * It is assumed that tree is either a SELECT or an IDENT. 325 * We have to weed out selects from non-type names here. 326 * @param tree The candidate tree. 327 */ 328 boolean isStaticReference(JCTree tree) { 329 if (tree.hasTag(SELECT)) { 330 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected); 331 if (lsym == null || lsym.kind != TYP) { 332 return false; 333 } 334 } 335 return true; 336 } 337 338 /** Is this symbol a type? 339 */ 340 static boolean isType(Symbol sym) { 341 return sym != null && sym.kind == TYP; 342 } 343 344 /** The current `this' symbol. 345 * @param env The current environment. 346 */ 347 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) { 348 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this); 349 } 350 351 /** Attribute a parsed identifier. 352 * @param tree Parsed identifier name 353 * @param topLevel The toplevel to use 354 */ 355 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) { 356 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel); 357 localEnv.enclClass = make.ClassDef(make.Modifiers(0), 358 syms.errSymbol.name, 359 null, null, null, null); 360 localEnv.enclClass.sym = syms.errSymbol; 361 return tree.accept(identAttributer, localEnv); 362 } 363 // where 364 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer(); 365 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> { 366 @Override @DefinedBy(Api.COMPILER_TREE) 367 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) { 368 Symbol site = visit(node.getExpression(), env); 369 if (site.kind == ERR || site.kind == ABSENT_TYP) 370 return site; 371 Name name = (Name)node.getIdentifier(); 372 if (site.kind == PCK) { 373 env.toplevel.packge = (PackageSymbol)site; 374 return rs.findIdentInPackage(env, (TypeSymbol)site, name, 375 KindSelector.TYP_PCK); 376 } else { 377 env.enclClass.sym = (ClassSymbol)site; 378 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site); 379 } 380 } 381 382 @Override @DefinedBy(Api.COMPILER_TREE) 383 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) { 384 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK); 385 } 386 } 387 388 public Type coerce(Type etype, Type ttype) { 389 return cfolder.coerce(etype, ttype); 390 } 391 392 public Type attribType(JCTree node, TypeSymbol sym) { 393 Env<AttrContext> env = typeEnvs.get(sym); 394 Env<AttrContext> localEnv = env.dup(node, env.info.dup()); 395 return attribTree(node, localEnv, unknownTypeInfo); 396 } 397 398 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) { 399 // Attribute qualifying package or class. 400 JCFieldAccess s = (JCFieldAccess)tree.qualid; 401 return attribTree(s.selected, env, 402 new ResultInfo(tree.staticImport ? 403 KindSelector.TYP : KindSelector.TYP_PCK, 404 Type.noType)); 405 } 406 407 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) { 408 breakTree = tree; 409 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 410 try { 411 attribExpr(expr, env); 412 } catch (BreakAttr b) { 413 return b.env; 414 } catch (AssertionError ae) { 415 if (ae.getCause() instanceof BreakAttr) { 416 return ((BreakAttr)(ae.getCause())).env; 417 } else { 418 throw ae; 419 } 420 } finally { 421 breakTree = null; 422 log.useSource(prev); 423 } 424 return env; 425 } 426 427 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) { 428 breakTree = tree; 429 JavaFileObject prev = log.useSource(env.toplevel.sourcefile); 430 try { 431 attribStat(stmt, env); 432 } catch (BreakAttr b) { 433 return b.env; 434 } catch (AssertionError ae) { 435 if (ae.getCause() instanceof BreakAttr) { 436 return ((BreakAttr)(ae.getCause())).env; 437 } else { 438 throw ae; 439 } 440 } finally { 441 breakTree = null; 442 log.useSource(prev); 443 } 444 return env; 445 } 446 447 private JCTree breakTree = null; 448 449 private static class BreakAttr extends RuntimeException { 450 static final long serialVersionUID = -6924771130405446405L; 451 private Env<AttrContext> env; 452 private BreakAttr(Env<AttrContext> env) { 453 this.env = env; 454 } 455 } 456 457 class ResultInfo { 458 final KindSelector pkind; 459 final Type pt; 460 final CheckContext checkContext; 461 462 ResultInfo(KindSelector pkind, Type pt) { 463 this(pkind, pt, chk.basicHandler); 464 } 465 466 protected ResultInfo(KindSelector pkind, 467 Type pt, CheckContext checkContext) { 468 this.pkind = pkind; 469 this.pt = pt; 470 this.checkContext = checkContext; 471 } 472 473 protected Type check(final DiagnosticPosition pos, final Type found) { 474 return chk.checkType(pos, found, pt, checkContext); 475 } 476 477 protected ResultInfo dup(Type newPt) { 478 return new ResultInfo(pkind, newPt, checkContext); 479 } 480 481 protected ResultInfo dup(CheckContext newContext) { 482 return new ResultInfo(pkind, pt, newContext); 483 } 484 485 protected ResultInfo dup(Type newPt, CheckContext newContext) { 486 return new ResultInfo(pkind, newPt, newContext); 487 } 488 489 @Override 490 public String toString() { 491 if (pt != null) { 492 return pt.toString(); 493 } else { 494 return ""; 495 } 496 } 497 } 498 499 class RecoveryInfo extends ResultInfo { 500 501 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) { 502 super(KindSelector.VAL, Type.recoveryType, 503 new Check.NestedCheckContext(chk.basicHandler) { 504 @Override 505 public DeferredAttr.DeferredAttrContext deferredAttrContext() { 506 return deferredAttrContext; 507 } 508 @Override 509 public boolean compatible(Type found, Type req, Warner warn) { 510 return true; 511 } 512 @Override 513 public void report(DiagnosticPosition pos, JCDiagnostic details) { 514 chk.basicHandler.report(pos, details); 515 } 516 }); 517 } 518 } 519 520 final ResultInfo statInfo; 521 final ResultInfo varAssignmentInfo; 522 final ResultInfo unknownAnyPolyInfo; 523 final ResultInfo unknownExprInfo; 524 final ResultInfo unknownTypeInfo; 525 final ResultInfo unknownTypeExprInfo; 526 final ResultInfo recoveryInfo; 527 528 Type pt() { 529 return resultInfo.pt; 530 } 531 532 KindSelector pkind() { 533 return resultInfo.pkind; 534 } 535 536/* ************************************************************************ 537 * Visitor methods 538 *************************************************************************/ 539 540 /** Visitor argument: the current environment. 541 */ 542 Env<AttrContext> env; 543 544 /** Visitor argument: the currently expected attribution result. 545 */ 546 ResultInfo resultInfo; 547 548 /** Visitor result: the computed type. 549 */ 550 Type result; 551 552 /** Synthetic tree to be used during 'fake' checks. 553 */ 554 JCTree noCheckTree; 555 556 /** Visitor method: attribute a tree, catching any completion failure 557 * exceptions. Return the tree's type. 558 * 559 * @param tree The tree to be visited. 560 * @param env The environment visitor argument. 561 * @param resultInfo The result info visitor argument. 562 */ 563 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) { 564 Env<AttrContext> prevEnv = this.env; 565 ResultInfo prevResult = this.resultInfo; 566 try { 567 this.env = env; 568 this.resultInfo = resultInfo; 569 tree.accept(this); 570 if (tree == breakTree && 571 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 572 throw new BreakAttr(copyEnv(env)); 573 } 574 return result; 575 } catch (CompletionFailure ex) { 576 tree.type = syms.errType; 577 return chk.completionError(tree.pos(), ex); 578 } finally { 579 this.env = prevEnv; 580 this.resultInfo = prevResult; 581 } 582 } 583 584 Env<AttrContext> copyEnv(Env<AttrContext> env) { 585 Env<AttrContext> newEnv = 586 env.dup(env.tree, env.info.dup(copyScope(env.info.scope))); 587 if (newEnv.outer != null) { 588 newEnv.outer = copyEnv(newEnv.outer); 589 } 590 return newEnv; 591 } 592 593 WriteableScope copyScope(WriteableScope sc) { 594 WriteableScope newScope = WriteableScope.create(sc.owner); 595 List<Symbol> elemsList = List.nil(); 596 for (Symbol sym : sc.getSymbols()) { 597 elemsList = elemsList.prepend(sym); 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(KindSelector.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(KindSelector.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 Env<AttrContext> analyzeEnv = 636 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(env.info.scope.owner))); 637 try { 638 return attribTree(tree, env, statInfo); 639 } finally { 640 analyzer.analyzeIfNeeded(tree, analyzeEnv); 641 } 642 } 643 644 /** Attribute a list of expressions, returning a list of types. 645 */ 646 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) { 647 ListBuffer<Type> ts = new ListBuffer<>(); 648 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 649 ts.append(attribExpr(l.head, env, pt)); 650 return ts.toList(); 651 } 652 653 /** Attribute a list of statements, returning nothing. 654 */ 655 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) { 656 for (List<T> l = trees; l.nonEmpty(); l = l.tail) 657 attribStat(l.head, env); 658 } 659 660 /** Attribute the arguments in a method call, returning the method kind. 661 */ 662 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) { 663 KindSelector kind = initialKind; 664 for (JCExpression arg : trees) { 665 Type argtype; 666 if (allowPoly && deferredAttr.isDeferred(env, arg)) { 667 argtype = deferredAttr.new DeferredType(arg, env); 668 kind = KindSelector.of(KindSelector.POLY, kind); 669 } else { 670 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo)); 671 } 672 argtypes.append(argtype); 673 } 674 return kind; 675 } 676 677 /** Attribute a type argument list, returning a list of types. 678 * Caller is responsible for calling checkRefTypes. 679 */ 680 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) { 681 ListBuffer<Type> argtypes = new ListBuffer<>(); 682 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail) 683 argtypes.append(attribType(l.head, env)); 684 return argtypes.toList(); 685 } 686 687 /** Attribute a type argument list, returning a list of types. 688 * Check that all the types are references. 689 */ 690 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) { 691 List<Type> types = attribAnyTypes(trees, env); 692 return chk.checkRefTypes(trees, types); 693 } 694 695 /** 696 * Attribute type variables (of generic classes or methods). 697 * Compound types are attributed later in attribBounds. 698 * @param typarams the type variables to enter 699 * @param env the current environment 700 */ 701 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) { 702 for (JCTypeParameter tvar : typarams) { 703 dependencies.push(AttributionKind.TVAR, tvar); 704 TypeVar a = (TypeVar)tvar.type; 705 a.tsym.flags_field |= UNATTRIBUTED; 706 a.bound = Type.noType; 707 if (!tvar.bounds.isEmpty()) { 708 List<Type> bounds = List.of(attribType(tvar.bounds.head, env)); 709 for (JCExpression bound : tvar.bounds.tail) 710 bounds = bounds.prepend(attribType(bound, env)); 711 types.setBounds(a, bounds.reverse()); 712 } else { 713 // if no bounds are given, assume a single bound of 714 // java.lang.Object. 715 types.setBounds(a, List.of(syms.objectType)); 716 } 717 a.tsym.flags_field &= ~UNATTRIBUTED; 718 dependencies.pop(); 719 } 720 for (JCTypeParameter tvar : typarams) { 721 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type); 722 } 723 } 724 725 /** 726 * Attribute the type references in a list of annotations. 727 */ 728 void attribAnnotationTypes(List<JCAnnotation> annotations, 729 Env<AttrContext> env) { 730 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) { 731 JCAnnotation a = al.head; 732 attribType(a.annotationType, env); 733 } 734 } 735 736 /** 737 * Attribute a "lazy constant value". 738 * @param env The env for the const value 739 * @param initializer The initializer for the const value 740 * @param type The expected type, or null 741 * @see VarSymbol#setLazyConstValue 742 */ 743 public Object attribLazyConstantValue(Env<AttrContext> env, 744 JCVariableDecl variable, 745 Type type) { 746 747 DiagnosticPosition prevLintPos 748 = deferredLintHandler.setPos(variable.pos()); 749 750 try { 751 Type itype = attribExpr(variable.init, env, type); 752 if (itype.constValue() != null) { 753 return coerce(itype, type).constValue(); 754 } else { 755 return null; 756 } 757 } finally { 758 deferredLintHandler.setPos(prevLintPos); 759 } 760 } 761 762 /** Attribute type reference in an `extends' or `implements' clause. 763 * Supertypes of anonymous inner classes are usually already attributed. 764 * 765 * @param tree The tree making up the type reference. 766 * @param env The environment current at the reference. 767 * @param classExpected true if only a class is expected here. 768 * @param interfaceExpected true if only an interface is expected here. 769 */ 770 Type attribBase(JCTree tree, 771 Env<AttrContext> env, 772 boolean classExpected, 773 boolean interfaceExpected, 774 boolean checkExtensible) { 775 Type t = tree.type != null ? 776 tree.type : 777 attribType(tree, env); 778 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible); 779 } 780 Type checkBase(Type t, 781 JCTree tree, 782 Env<AttrContext> env, 783 boolean classExpected, 784 boolean interfaceExpected, 785 boolean checkExtensible) { 786 if (t.tsym.isAnonymous()) { 787 log.error(tree.pos(), "cant.inherit.from.anon"); 788 return types.createErrorType(t); 789 } 790 if (t.isErroneous()) 791 return t; 792 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) { 793 // check that type variable is already visible 794 if (t.getUpperBound() == null) { 795 log.error(tree.pos(), "illegal.forward.ref"); 796 return types.createErrorType(t); 797 } 798 } else { 799 t = chk.checkClassType(tree.pos(), t, checkExtensible); 800 } 801 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) { 802 log.error(tree.pos(), "intf.expected.here"); 803 // return errType is necessary since otherwise there might 804 // be undetected cycles which cause attribution to loop 805 return types.createErrorType(t); 806 } else if (checkExtensible && 807 classExpected && 808 (t.tsym.flags() & INTERFACE) != 0) { 809 log.error(tree.pos(), "no.intf.expected.here"); 810 return types.createErrorType(t); 811 } 812 if (checkExtensible && 813 ((t.tsym.flags() & FINAL) != 0)) { 814 log.error(tree.pos(), 815 "cant.inherit.from.final", t.tsym); 816 } 817 chk.checkNonCyclic(tree.pos(), t); 818 return t; 819 } 820 821 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) { 822 Assert.check((env.enclClass.sym.flags() & ENUM) != 0); 823 id.type = env.info.scope.owner.enclClass().type; 824 id.sym = env.info.scope.owner.enclClass(); 825 return id.type; 826 } 827 828 public void visitClassDef(JCClassDecl tree) { 829 // Local and anonymous classes have not been entered yet, so we need to 830 // do it now. 831 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) { 832 enter.classEnter(tree, env); 833 } else { 834 // If this class declaration is part of a class level annotation, 835 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in 836 // order to simplify later steps and allow for sensible error 837 // messages. 838 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree)) 839 enter.classEnter(tree, env); 840 } 841 842 ClassSymbol c = tree.sym; 843 if (c == null) { 844 // exit in case something drastic went wrong during enter. 845 result = null; 846 } else { 847 // make sure class has been completed: 848 c.complete(); 849 850 // If this class appears as an anonymous class 851 // in a superclass constructor call where 852 // no explicit outer instance is given, 853 // disable implicit outer instance from being passed. 854 // (This would be an illegal access to "this before super"). 855 if (env.info.isSelfCall && 856 env.tree.hasTag(NEWCLASS) && 857 ((JCNewClass) env.tree).encl == null) 858 { 859 c.flags_field |= NOOUTERTHIS; 860 } 861 attribClass(tree.pos(), c); 862 result = tree.type = c.type; 863 } 864 } 865 866 public void visitMethodDef(JCMethodDecl tree) { 867 MethodSymbol m = tree.sym; 868 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0; 869 870 Lint lint = env.info.lint.augment(m); 871 Lint prevLint = chk.setLint(lint); 872 MethodSymbol prevMethod = chk.setMethod(m); 873 try { 874 deferredLintHandler.flush(tree.pos()); 875 chk.checkDeprecatedAnnotation(tree.pos(), m); 876 877 878 // Create a new environment with local scope 879 // for attributing the method. 880 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env); 881 localEnv.info.lint = lint; 882 883 attribStats(tree.typarams, localEnv); 884 885 // If we override any other methods, check that we do so properly. 886 // JLS ??? 887 if (m.isStatic()) { 888 chk.checkHideClashes(tree.pos(), env.enclClass.type, m); 889 } else { 890 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m); 891 } 892 chk.checkOverride(env, tree, m); 893 894 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) { 895 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location()); 896 } 897 898 // Enter all type parameters into the local method scope. 899 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail) 900 localEnv.info.scope.enterIfAbsent(l.head.type.tsym); 901 902 ClassSymbol owner = env.enclClass.sym; 903 if ((owner.flags() & ANNOTATION) != 0 && 904 tree.params.nonEmpty()) 905 log.error(tree.params.head.pos(), 906 "intf.annotation.members.cant.have.params"); 907 908 // Attribute all value parameters. 909 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) { 910 attribStat(l.head, localEnv); 911 } 912 913 chk.checkVarargsMethodDecl(localEnv, tree); 914 915 // Check that type parameters are well-formed. 916 chk.validate(tree.typarams, localEnv); 917 918 // Check that result type is well-formed. 919 if (tree.restype != null && !tree.restype.type.hasTag(VOID)) 920 chk.validate(tree.restype, localEnv); 921 922 // Check that receiver type is well-formed. 923 if (tree.recvparam != null) { 924 // Use a new environment to check the receiver parameter. 925 // Otherwise I get "might not have been initialized" errors. 926 // Is there a better way? 927 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env); 928 attribType(tree.recvparam, newEnv); 929 chk.validate(tree.recvparam, newEnv); 930 } 931 932 // annotation method checks 933 if ((owner.flags() & ANNOTATION) != 0) { 934 // annotation method cannot have throws clause 935 if (tree.thrown.nonEmpty()) { 936 log.error(tree.thrown.head.pos(), 937 "throws.not.allowed.in.intf.annotation"); 938 } 939 // annotation method cannot declare type-parameters 940 if (tree.typarams.nonEmpty()) { 941 log.error(tree.typarams.head.pos(), 942 "intf.annotation.members.cant.have.type.params"); 943 } 944 // validate annotation method's return type (could be an annotation type) 945 chk.validateAnnotationType(tree.restype); 946 // ensure that annotation method does not clash with members of Object/Annotation 947 chk.validateAnnotationMethod(tree.pos(), m); 948 } 949 950 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail) 951 chk.checkType(l.head.pos(), l.head.type, syms.throwableType); 952 953 if (tree.body == null) { 954 // Empty bodies are only allowed for 955 // abstract, native, or interface methods, or for methods 956 // in a retrofit signature class. 957 if (tree.defaultValue != null) { 958 if ((owner.flags() & ANNOTATION) == 0) 959 log.error(tree.pos(), 960 "default.allowed.in.intf.annotation.member"); 961 } 962 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 && 963 !relax) 964 log.error(tree.pos(), "missing.meth.body.or.decl.abstract"); 965 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) { 966 if ((owner.flags() & INTERFACE) != 0) { 967 log.error(tree.body.pos(), "intf.meth.cant.have.body"); 968 } else { 969 log.error(tree.pos(), "abstract.meth.cant.have.body"); 970 } 971 } else if ((tree.mods.flags & NATIVE) != 0) { 972 log.error(tree.pos(), "native.meth.cant.have.body"); 973 } else { 974 // Add an implicit super() call unless an explicit call to 975 // super(...) or this(...) is given 976 // or we are compiling class java.lang.Object. 977 if (tree.name == names.init && owner.type != syms.objectType) { 978 JCBlock body = tree.body; 979 if (body.stats.isEmpty() || 980 !TreeInfo.isSelfCall(body.stats.head)) { 981 body.stats = body.stats. 982 prepend(typeEnter.SuperCall(make.at(body.pos), 983 List.<Type>nil(), 984 List.<JCVariableDecl>nil(), 985 false)); 986 } else if ((env.enclClass.sym.flags() & ENUM) != 0 && 987 (tree.mods.flags & GENERATEDCONSTR) == 0 && 988 TreeInfo.isSuperCall(body.stats.head)) { 989 // enum constructors are not allowed to call super 990 // directly, so make sure there aren't any super calls 991 // in enum constructors, except in the compiler 992 // generated one. 993 log.error(tree.body.stats.head.pos(), 994 "call.to.super.not.allowed.in.enum.ctor", 995 env.enclClass.sym); 996 } 997 } 998 999 // Attribute all type annotations in the body 1000 annotate.annotateTypeLater(tree.body, localEnv, m, null); 1001 annotate.flush(); 1002 1003 // Attribute method body. 1004 attribStat(tree.body, localEnv); 1005 } 1006 1007 localEnv.info.scope.leave(); 1008 result = tree.type = m.type; 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 annotate.annotateTypeLater(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 Symbol fakeOwner = 1085 new MethodSymbol(tree.flags | BLOCK | 1086 env.info.scope.owner.flags() & STRICTFP, names.empty, null, 1087 env.info.scope.owner); 1088 final Env<AttrContext> localEnv = 1089 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner))); 1090 1091 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++; 1092 // Attribute all type annotations in the block 1093 annotate.annotateTypeLater(tree, localEnv, localEnv.info.scope.owner, null); 1094 annotate.flush(); 1095 attribStats(tree.stats, localEnv); 1096 1097 { 1098 // Store init and clinit type annotations with the ClassSymbol 1099 // to allow output in Gen.normalizeDefs. 1100 ClassSymbol cs = (ClassSymbol)env.info.scope.owner; 1101 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes(); 1102 if ((tree.flags & STATIC) != 0) { 1103 cs.appendClassInitTypeAttributes(tas); 1104 } else { 1105 cs.appendInitTypeAttributes(tas); 1106 } 1107 } 1108 } else { 1109 // Create a new local environment with a local scope. 1110 Env<AttrContext> localEnv = 1111 env.dup(tree, env.info.dup(env.info.scope.dup())); 1112 try { 1113 attribStats(tree.stats, localEnv); 1114 } finally { 1115 localEnv.info.scope.leave(); 1116 } 1117 } 1118 result = null; 1119 } 1120 1121 public void visitDoLoop(JCDoWhileLoop tree) { 1122 attribStat(tree.body, env.dup(tree)); 1123 attribExpr(tree.cond, env, syms.booleanType); 1124 result = null; 1125 } 1126 1127 public void visitWhileLoop(JCWhileLoop tree) { 1128 attribExpr(tree.cond, env, syms.booleanType); 1129 attribStat(tree.body, env.dup(tree)); 1130 result = null; 1131 } 1132 1133 public void visitForLoop(JCForLoop tree) { 1134 Env<AttrContext> loopEnv = 1135 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1136 try { 1137 attribStats(tree.init, loopEnv); 1138 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType); 1139 loopEnv.tree = tree; // before, we were not in loop! 1140 attribStats(tree.step, loopEnv); 1141 attribStat(tree.body, loopEnv); 1142 result = null; 1143 } 1144 finally { 1145 loopEnv.info.scope.leave(); 1146 } 1147 } 1148 1149 public void visitForeachLoop(JCEnhancedForLoop tree) { 1150 Env<AttrContext> loopEnv = 1151 env.dup(env.tree, env.info.dup(env.info.scope.dup())); 1152 try { 1153 //the Formal Parameter of a for-each loop is not in the scope when 1154 //attributing the for-each expression; we mimick this by attributing 1155 //the for-each expression first (against original scope). 1156 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv)); 1157 attribStat(tree.var, loopEnv); 1158 chk.checkNonVoid(tree.pos(), exprType); 1159 Type elemtype = types.elemtype(exprType); // perhaps expr is an array? 1160 if (elemtype == null) { 1161 // or perhaps expr implements Iterable<T>? 1162 Type base = types.asSuper(exprType, syms.iterableType.tsym); 1163 if (base == null) { 1164 log.error(tree.expr.pos(), 1165 "foreach.not.applicable.to.type", 1166 exprType, 1167 diags.fragment("type.req.array.or.iterable")); 1168 elemtype = types.createErrorType(exprType); 1169 } else { 1170 List<Type> iterableParams = base.allparams(); 1171 elemtype = iterableParams.isEmpty() 1172 ? syms.objectType 1173 : types.wildUpperBound(iterableParams.head); 1174 } 1175 } 1176 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type); 1177 loopEnv.tree = tree; // before, we were not in loop! 1178 attribStat(tree.body, loopEnv); 1179 result = null; 1180 } 1181 finally { 1182 loopEnv.info.scope.leave(); 1183 } 1184 } 1185 1186 public void visitLabelled(JCLabeledStatement tree) { 1187 // Check that label is not used in an enclosing statement 1188 Env<AttrContext> env1 = env; 1189 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) { 1190 if (env1.tree.hasTag(LABELLED) && 1191 ((JCLabeledStatement) env1.tree).label == tree.label) { 1192 log.error(tree.pos(), "label.already.in.use", 1193 tree.label); 1194 break; 1195 } 1196 env1 = env1.next; 1197 } 1198 1199 attribStat(tree.body, env.dup(tree)); 1200 result = null; 1201 } 1202 1203 public void visitSwitch(JCSwitch tree) { 1204 Type seltype = attribExpr(tree.selector, env); 1205 1206 Env<AttrContext> switchEnv = 1207 env.dup(tree, env.info.dup(env.info.scope.dup())); 1208 1209 try { 1210 1211 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0; 1212 boolean stringSwitch = false; 1213 if (types.isSameType(seltype, syms.stringType)) { 1214 if (allowStringsInSwitch) { 1215 stringSwitch = true; 1216 } else { 1217 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName); 1218 } 1219 } 1220 if (!enumSwitch && !stringSwitch) 1221 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType); 1222 1223 // Attribute all cases and 1224 // check that there are no duplicate case labels or default clauses. 1225 Set<Object> labels = new HashSet<>(); // The set of case labels. 1226 boolean hasDefault = false; // Is there a default label? 1227 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) { 1228 JCCase c = l.head; 1229 if (c.pat != null) { 1230 if (enumSwitch) { 1231 Symbol sym = enumConstant(c.pat, seltype); 1232 if (sym == null) { 1233 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum"); 1234 } else if (!labels.add(sym)) { 1235 log.error(c.pos(), "duplicate.case.label"); 1236 } 1237 } else { 1238 Type pattype = attribExpr(c.pat, switchEnv, seltype); 1239 if (!pattype.hasTag(ERROR)) { 1240 if (pattype.constValue() == null) { 1241 log.error(c.pat.pos(), 1242 (stringSwitch ? "string.const.req" : "const.expr.req")); 1243 } else if (!labels.add(pattype.constValue())) { 1244 log.error(c.pos(), "duplicate.case.label"); 1245 } 1246 } 1247 } 1248 } else if (hasDefault) { 1249 log.error(c.pos(), "duplicate.default.label"); 1250 } else { 1251 hasDefault = true; 1252 } 1253 Env<AttrContext> caseEnv = 1254 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup())); 1255 try { 1256 attribStats(c.stats, caseEnv); 1257 } finally { 1258 caseEnv.info.scope.leave(); 1259 addVars(c.stats, switchEnv.info.scope); 1260 } 1261 } 1262 1263 result = null; 1264 } 1265 finally { 1266 switchEnv.info.scope.leave(); 1267 } 1268 } 1269 // where 1270 /** Add any variables defined in stats to the switch scope. */ 1271 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) { 1272 for (;stats.nonEmpty(); stats = stats.tail) { 1273 JCTree stat = stats.head; 1274 if (stat.hasTag(VARDEF)) 1275 switchScope.enter(((JCVariableDecl) stat).sym); 1276 } 1277 } 1278 // where 1279 /** Return the selected enumeration constant symbol, or null. */ 1280 private Symbol enumConstant(JCTree tree, Type enumType) { 1281 if (tree.hasTag(IDENT)) { 1282 JCIdent ident = (JCIdent)tree; 1283 Name name = ident.name; 1284 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) { 1285 if (sym.kind == VAR) { 1286 Symbol s = ident.sym = sym; 1287 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated 1288 ident.type = s.type; 1289 return ((s.flags_field & Flags.ENUM) == 0) 1290 ? null : s; 1291 } 1292 } 1293 } 1294 return null; 1295 } 1296 1297 public void visitSynchronized(JCSynchronized tree) { 1298 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env)); 1299 attribStat(tree.body, env); 1300 result = null; 1301 } 1302 1303 public void visitTry(JCTry tree) { 1304 // Create a new local environment with a local 1305 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup())); 1306 try { 1307 boolean isTryWithResource = tree.resources.nonEmpty(); 1308 // Create a nested environment for attributing the try block if needed 1309 Env<AttrContext> tryEnv = isTryWithResource ? 1310 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) : 1311 localEnv; 1312 try { 1313 // Attribute resource declarations 1314 for (JCTree resource : tree.resources) { 1315 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) { 1316 @Override 1317 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1318 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details)); 1319 } 1320 }; 1321 ResultInfo twrResult = 1322 new ResultInfo(KindSelector.VAR, 1323 syms.autoCloseableType, 1324 twrContext); 1325 if (resource.hasTag(VARDEF)) { 1326 attribStat(resource, tryEnv); 1327 twrResult.check(resource, resource.type); 1328 1329 //check that resource type cannot throw InterruptedException 1330 checkAutoCloseable(resource.pos(), localEnv, resource.type); 1331 1332 VarSymbol var = ((JCVariableDecl) resource).sym; 1333 var.setData(ElementKind.RESOURCE_VARIABLE); 1334 } else { 1335 attribTree(resource, tryEnv, twrResult); 1336 } 1337 } 1338 // Attribute body 1339 attribStat(tree.body, tryEnv); 1340 } finally { 1341 if (isTryWithResource) 1342 tryEnv.info.scope.leave(); 1343 } 1344 1345 // Attribute catch clauses 1346 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) { 1347 JCCatch c = l.head; 1348 Env<AttrContext> catchEnv = 1349 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup())); 1350 try { 1351 Type ctype = attribStat(c.param, catchEnv); 1352 if (TreeInfo.isMultiCatch(c)) { 1353 //multi-catch parameter is implicitly marked as final 1354 c.param.sym.flags_field |= FINAL | UNION; 1355 } 1356 if (c.param.sym.kind == VAR) { 1357 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER); 1358 } 1359 chk.checkType(c.param.vartype.pos(), 1360 chk.checkClassType(c.param.vartype.pos(), ctype), 1361 syms.throwableType); 1362 attribStat(c.body, catchEnv); 1363 } finally { 1364 catchEnv.info.scope.leave(); 1365 } 1366 } 1367 1368 // Attribute finalizer 1369 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv); 1370 result = null; 1371 } 1372 finally { 1373 localEnv.info.scope.leave(); 1374 } 1375 } 1376 1377 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) { 1378 if (!resource.isErroneous() && 1379 types.asSuper(resource, syms.autoCloseableType.tsym) != null && 1380 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself 1381 Symbol close = syms.noSymbol; 1382 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log); 1383 try { 1384 close = rs.resolveQualifiedMethod(pos, 1385 env, 1386 resource, 1387 names.close, 1388 List.<Type>nil(), 1389 List.<Type>nil()); 1390 } 1391 finally { 1392 log.popDiagnosticHandler(discardHandler); 1393 } 1394 if (close.kind == MTH && 1395 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) && 1396 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) && 1397 env.info.lint.isEnabled(LintCategory.TRY)) { 1398 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource); 1399 } 1400 } 1401 } 1402 1403 public void visitConditional(JCConditional tree) { 1404 Type condtype = attribExpr(tree.cond, env, syms.booleanType); 1405 1406 tree.polyKind = (!allowPoly || 1407 pt().hasTag(NONE) && pt() != Type.recoveryType || 1408 isBooleanOrNumeric(env, tree)) ? 1409 PolyKind.STANDALONE : PolyKind.POLY; 1410 1411 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) { 1412 //cannot get here (i.e. it means we are returning from void method - which is already an error) 1413 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void")); 1414 result = tree.type = types.createErrorType(resultInfo.pt); 1415 return; 1416 } 1417 1418 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ? 1419 unknownExprInfo : 1420 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) { 1421 //this will use enclosing check context to check compatibility of 1422 //subexpression against target type; if we are in a method check context, 1423 //depending on whether boxing is allowed, we could have incompatibilities 1424 @Override 1425 public void report(DiagnosticPosition pos, JCDiagnostic details) { 1426 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details)); 1427 } 1428 }); 1429 1430 Type truetype = attribTree(tree.truepart, env, condInfo); 1431 Type falsetype = attribTree(tree.falsepart, env, condInfo); 1432 1433 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt(); 1434 if (condtype.constValue() != null && 1435 truetype.constValue() != null && 1436 falsetype.constValue() != null && 1437 !owntype.hasTag(NONE)) { 1438 //constant folding 1439 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype); 1440 } 1441 result = check(tree, owntype, KindSelector.VAL, resultInfo); 1442 } 1443 //where 1444 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) { 1445 switch (tree.getTag()) { 1446 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) || 1447 ((JCLiteral)tree).typetag == BOOLEAN || 1448 ((JCLiteral)tree).typetag == BOT; 1449 case LAMBDA: case REFERENCE: return false; 1450 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr); 1451 case CONDEXPR: 1452 JCConditional condTree = (JCConditional)tree; 1453 return isBooleanOrNumeric(env, condTree.truepart) && 1454 isBooleanOrNumeric(env, condTree.falsepart); 1455 case APPLY: 1456 JCMethodInvocation speculativeMethodTree = 1457 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo); 1458 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth); 1459 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ? 1460 env.enclClass.type : 1461 ((JCFieldAccess)speculativeMethodTree.meth).selected.type; 1462 Type owntype = types.memberType(receiverType, msym).getReturnType(); 1463 return primitiveOrBoxed(owntype); 1464 case NEWCLASS: 1465 JCExpression className = 1466 removeClassParams.translate(((JCNewClass)tree).clazz); 1467 JCExpression speculativeNewClassTree = 1468 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo); 1469 return primitiveOrBoxed(speculativeNewClassTree.type); 1470 default: 1471 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type; 1472 return primitiveOrBoxed(speculativeType); 1473 } 1474 } 1475 //where 1476 boolean primitiveOrBoxed(Type t) { 1477 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive()); 1478 } 1479 1480 TreeTranslator removeClassParams = new TreeTranslator() { 1481 @Override 1482 public void visitTypeApply(JCTypeApply tree) { 1483 result = translate(tree.clazz); 1484 } 1485 }; 1486 1487 /** Compute the type of a conditional expression, after 1488 * checking that it exists. See JLS 15.25. Does not take into 1489 * account the special case where condition and both arms 1490 * are constants. 1491 * 1492 * @param pos The source position to be used for error 1493 * diagnostics. 1494 * @param thentype The type of the expression's then-part. 1495 * @param elsetype The type of the expression's else-part. 1496 */ 1497 Type condType(DiagnosticPosition pos, 1498 Type thentype, Type elsetype) { 1499 // If same type, that is the result 1500 if (types.isSameType(thentype, elsetype)) 1501 return thentype.baseType(); 1502 1503 Type thenUnboxed = (thentype.isPrimitive()) 1504 ? thentype : types.unboxedType(thentype); 1505 Type elseUnboxed = (elsetype.isPrimitive()) 1506 ? elsetype : types.unboxedType(elsetype); 1507 1508 // Otherwise, if both arms can be converted to a numeric 1509 // type, return the least numeric type that fits both arms 1510 // (i.e. return larger of the two, or return int if one 1511 // arm is short, the other is char). 1512 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) { 1513 // If one arm has an integer subrange type (i.e., byte, 1514 // short, or char), and the other is an integer constant 1515 // that fits into the subrange, return the subrange type. 1516 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && 1517 elseUnboxed.hasTag(INT) && 1518 types.isAssignable(elseUnboxed, thenUnboxed)) { 1519 return thenUnboxed.baseType(); 1520 } 1521 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && 1522 thenUnboxed.hasTag(INT) && 1523 types.isAssignable(thenUnboxed, elseUnboxed)) { 1524 return elseUnboxed.baseType(); 1525 } 1526 1527 for (TypeTag tag : primitiveTags) { 1528 Type candidate = syms.typeOfTag[tag.ordinal()]; 1529 if (types.isSubtype(thenUnboxed, candidate) && 1530 types.isSubtype(elseUnboxed, candidate)) { 1531 return candidate; 1532 } 1533 } 1534 } 1535 1536 // Those were all the cases that could result in a primitive 1537 if (thentype.isPrimitive()) 1538 thentype = types.boxedClass(thentype).type; 1539 if (elsetype.isPrimitive()) 1540 elsetype = types.boxedClass(elsetype).type; 1541 1542 if (types.isSubtype(thentype, elsetype)) 1543 return elsetype.baseType(); 1544 if (types.isSubtype(elsetype, thentype)) 1545 return thentype.baseType(); 1546 1547 if (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 KindSelector kind = attribArgs(KindSelector.MTH, 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) 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, 1799 new ResultInfo(kind, mpt)); 1800 } 1801 // Otherwise, `site' is an error type and we do nothing 1802 } 1803 result = tree.type = syms.voidType; 1804 } else { 1805 // Otherwise, we are seeing a regular method call. 1806 // Attribute the arguments, yielding list of argument types, ... 1807 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1808 argtypes = argtypesBuf.toList(); 1809 typeargtypes = attribAnyTypes(tree.typeargs, localEnv); 1810 1811 // ... and attribute the method using as a prototype a methodtype 1812 // whose formal argument types is exactly the list of actual 1813 // arguments (this will also set the method symbol). 1814 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes); 1815 localEnv.info.pendingResolutionPhase = null; 1816 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext)); 1817 1818 // Compute the result type. 1819 Type restype = mtype.getReturnType(); 1820 if (restype.hasTag(WILDCARD)) 1821 throw new AssertionError(mtype); 1822 1823 Type qualifier = (tree.meth.hasTag(SELECT)) 1824 ? ((JCFieldAccess) tree.meth).selected.type 1825 : env.enclClass.sym.type; 1826 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype); 1827 1828 chk.checkRefTypes(tree.typeargs, typeargtypes); 1829 1830 // Check that value of resulting type is admissible in the 1831 // current context. Also, capture the return type 1832 result = check(tree, capture(restype), KindSelector.VAL, resultInfo); 1833 } 1834 chk.validate(tree.typeargs, localEnv); 1835 } 1836 //where 1837 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) { 1838 if (methodName == names.clone && types.isArray(qualifierType)) { 1839 // as a special case, array.clone() has a result that is 1840 // the same as static type of the array being cloned 1841 return qualifierType; 1842 } else if (methodName == names.getClass && argtypes.isEmpty()) { 1843 // as a special case, x.getClass() has type Class<? extends |X|> 1844 return new ClassType(restype.getEnclosingType(), 1845 List.<Type>of(new WildcardType(types.erasure(qualifierType), 1846 BoundKind.EXTENDS, 1847 syms.boundClass)), 1848 restype.tsym, 1849 restype.getMetadata()); 1850 } else { 1851 return restype; 1852 } 1853 } 1854 1855 /** Check that given application node appears as first statement 1856 * in a constructor call. 1857 * @param tree The application node 1858 * @param env The environment current at the application. 1859 */ 1860 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) { 1861 JCMethodDecl enclMethod = env.enclMethod; 1862 if (enclMethod != null && enclMethod.name == names.init) { 1863 JCBlock body = enclMethod.body; 1864 if (body.stats.head.hasTag(EXEC) && 1865 ((JCExpressionStatement) body.stats.head).expr == tree) 1866 return true; 1867 } 1868 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor", 1869 TreeInfo.name(tree.meth)); 1870 return false; 1871 } 1872 1873 /** Obtain a method type with given argument types. 1874 */ 1875 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) { 1876 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass); 1877 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt); 1878 } 1879 1880 public void visitNewClass(final JCNewClass tree) { 1881 Type owntype = types.createErrorType(tree.type); 1882 1883 // The local environment of a class creation is 1884 // a new environment nested in the current one. 1885 Env<AttrContext> localEnv = env.dup(tree, env.info.dup()); 1886 1887 // The anonymous inner class definition of the new expression, 1888 // if one is defined by it. 1889 JCClassDecl cdef = tree.def; 1890 1891 // If enclosing class is given, attribute it, and 1892 // complete class name to be fully qualified 1893 JCExpression clazz = tree.clazz; // Class field following new 1894 JCExpression clazzid; // Identifier in class field 1895 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid 1896 annoclazzid = null; 1897 1898 if (clazz.hasTag(TYPEAPPLY)) { 1899 clazzid = ((JCTypeApply) clazz).clazz; 1900 if (clazzid.hasTag(ANNOTATED_TYPE)) { 1901 annoclazzid = (JCAnnotatedType) clazzid; 1902 clazzid = annoclazzid.underlyingType; 1903 } 1904 } else { 1905 if (clazz.hasTag(ANNOTATED_TYPE)) { 1906 annoclazzid = (JCAnnotatedType) clazz; 1907 clazzid = annoclazzid.underlyingType; 1908 } else { 1909 clazzid = clazz; 1910 } 1911 } 1912 1913 JCExpression clazzid1 = clazzid; // The same in fully qualified form 1914 1915 if (tree.encl != null) { 1916 // We are seeing a qualified new, of the form 1917 // <expr>.new C <...> (...) ... 1918 // In this case, we let clazz stand for the name of the 1919 // allocated class C prefixed with the type of the qualifier 1920 // expression, so that we can 1921 // resolve it with standard techniques later. I.e., if 1922 // <expr> has type T, then <expr>.new C <...> (...) 1923 // yields a clazz T.C. 1924 Type encltype = chk.checkRefType(tree.encl.pos(), 1925 attribExpr(tree.encl, env)); 1926 // TODO 308: in <expr>.new C, do we also want to add the type annotations 1927 // from expr to the combined type, or not? Yes, do this. 1928 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype), 1929 ((JCIdent) clazzid).name); 1930 1931 EndPosTable endPosTable = this.env.toplevel.endPositions; 1932 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable)); 1933 if (clazz.hasTag(ANNOTATED_TYPE)) { 1934 JCAnnotatedType annoType = (JCAnnotatedType) clazz; 1935 List<JCAnnotation> annos = annoType.annotations; 1936 1937 if (annoType.underlyingType.hasTag(TYPEAPPLY)) { 1938 clazzid1 = make.at(tree.pos). 1939 TypeApply(clazzid1, 1940 ((JCTypeApply) clazz).arguments); 1941 } 1942 1943 clazzid1 = make.at(tree.pos). 1944 AnnotatedType(annos, clazzid1); 1945 } else if (clazz.hasTag(TYPEAPPLY)) { 1946 clazzid1 = make.at(tree.pos). 1947 TypeApply(clazzid1, 1948 ((JCTypeApply) clazz).arguments); 1949 } 1950 1951 clazz = clazzid1; 1952 } 1953 1954 // Attribute clazz expression and store 1955 // symbol + type back into the attributed tree. 1956 Type clazztype = TreeInfo.isEnumInit(env.tree) ? 1957 attribIdentAsEnumType(env, (JCIdent)clazz) : 1958 attribType(clazz, env); 1959 1960 clazztype = chk.checkDiamond(tree, clazztype); 1961 chk.validate(clazz, localEnv); 1962 if (tree.encl != null) { 1963 // We have to work in this case to store 1964 // symbol + type back into the attributed tree. 1965 tree.clazz.type = clazztype; 1966 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1)); 1967 clazzid.type = ((JCIdent) clazzid).sym.type; 1968 if (annoclazzid != null) { 1969 annoclazzid.type = clazzid.type; 1970 } 1971 if (!clazztype.isErroneous()) { 1972 if (cdef != null && clazztype.tsym.isInterface()) { 1973 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new"); 1974 } else if (clazztype.tsym.isStatic()) { 1975 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym); 1976 } 1977 } 1978 } else if (!clazztype.tsym.isInterface() && 1979 clazztype.getEnclosingType().hasTag(CLASS)) { 1980 // Check for the existence of an apropos outer instance 1981 rs.resolveImplicitThis(tree.pos(), env, clazztype); 1982 } 1983 1984 // Attribute constructor arguments. 1985 ListBuffer<Type> argtypesBuf = new ListBuffer<>(); 1986 final KindSelector pkind = 1987 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf); 1988 List<Type> argtypes = argtypesBuf.toList(); 1989 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv); 1990 1991 // If we have made no mistakes in the class type... 1992 if (clazztype.hasTag(CLASS)) { 1993 // Enums may not be instantiated except implicitly 1994 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 && 1995 (!env.tree.hasTag(VARDEF) || 1996 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 || 1997 ((JCVariableDecl) env.tree).init != tree)) 1998 log.error(tree.pos(), "enum.cant.be.instantiated"); 1999 2000 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) && 2001 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2002 boolean skipNonDiamondPath = false; 2003 // Check that class is not abstract 2004 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy 2005 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) { 2006 log.error(tree.pos(), "abstract.cant.be.instantiated", 2007 clazztype.tsym); 2008 skipNonDiamondPath = true; 2009 } else if (cdef != null && clazztype.tsym.isInterface()) { 2010 // Check that no constructor arguments are given to 2011 // anonymous classes implementing an interface 2012 if (!argtypes.isEmpty()) 2013 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args"); 2014 2015 if (!typeargtypes.isEmpty()) 2016 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs"); 2017 2018 // Error recovery: pretend no arguments were supplied. 2019 argtypes = List.nil(); 2020 typeargtypes = List.nil(); 2021 skipNonDiamondPath = true; 2022 } 2023 if (TreeInfo.isDiamond(tree)) { 2024 ClassType site = new ClassType(clazztype.getEnclosingType(), 2025 clazztype.tsym.type.getTypeArguments(), 2026 clazztype.tsym, 2027 clazztype.getMetadata()); 2028 2029 Env<AttrContext> diamondEnv = localEnv.dup(tree); 2030 diamondEnv.info.selectSuper = cdef != null; 2031 diamondEnv.info.pendingResolutionPhase = null; 2032 2033 //if the type of the instance creation expression is a class type 2034 //apply method resolution inference (JLS 15.12.2.7). The return type 2035 //of the resolved constructor will be a partially instantiated type 2036 Symbol constructor = rs.resolveDiamond(tree.pos(), 2037 diamondEnv, 2038 site, 2039 argtypes, 2040 typeargtypes); 2041 tree.constructor = constructor.baseSymbol(); 2042 2043 final TypeSymbol csym = clazztype.tsym; 2044 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) { 2045 @Override 2046 public void report(DiagnosticPosition _unused, JCDiagnostic details) { 2047 enclosingContext.report(tree.clazz, 2048 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details)); 2049 } 2050 }); 2051 Type constructorType = tree.constructorType = types.createErrorType(clazztype); 2052 constructorType = checkId(noCheckTree, site, 2053 constructor, 2054 diamondEnv, 2055 diamondResult); 2056 2057 tree.clazz.type = types.createErrorType(clazztype); 2058 if (!constructorType.isErroneous()) { 2059 tree.clazz.type = clazz.type = constructorType.getReturnType(); 2060 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType); 2061 } 2062 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true); 2063 } 2064 2065 // Resolve the called constructor under the assumption 2066 // that we are referring to a superclass instance of the 2067 // current instance (JLS ???). 2068 else if (!skipNonDiamondPath) { 2069 //the following code alters some of the fields in the current 2070 //AttrContext - hence, the current context must be dup'ed in 2071 //order to avoid downstream failures 2072 Env<AttrContext> rsEnv = localEnv.dup(tree); 2073 rsEnv.info.selectSuper = cdef != null; 2074 rsEnv.info.pendingResolutionPhase = null; 2075 tree.constructor = rs.resolveConstructor( 2076 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes); 2077 if (cdef == null) { //do not check twice! 2078 tree.constructorType = checkId(noCheckTree, 2079 clazztype, 2080 tree.constructor, 2081 rsEnv, 2082 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes))); 2083 if (rsEnv.info.lastResolveVarargs()) 2084 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null); 2085 } 2086 } 2087 2088 if (cdef != null) { 2089 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind); 2090 return; 2091 } 2092 2093 if (tree.constructor != null && tree.constructor.kind == MTH) 2094 owntype = clazztype; 2095 } 2096 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2097 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2098 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) { 2099 //we need to wait for inference to finish and then replace inference vars in the constructor type 2100 inferenceContext.addFreeTypeListener(List.of(tree.constructorType), 2101 instantiatedContext -> { 2102 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2103 }); 2104 } 2105 chk.validate(tree.typeargs, localEnv); 2106 } 2107 2108 // where 2109 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype, 2110 JCClassDecl cdef, Env<AttrContext> localEnv, 2111 List<Type> argtypes, List<Type> typeargtypes, 2112 KindSelector pkind) { 2113 // We are seeing an anonymous class instance creation. 2114 // In this case, the class instance creation 2115 // expression 2116 // 2117 // E.new <typeargs1>C<typargs2>(args) { ... } 2118 // 2119 // is represented internally as 2120 // 2121 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) . 2122 // 2123 // This expression is then *transformed* as follows: 2124 // 2125 // (1) add an extends or implements clause 2126 // (2) add a constructor. 2127 // 2128 // For instance, if C is a class, and ET is the type of E, 2129 // the expression 2130 // 2131 // E.new <typeargs1>C<typargs2>(args) { ... } 2132 // 2133 // is translated to (where X is a fresh name and typarams is the 2134 // parameter list of the super constructor): 2135 // 2136 // new <typeargs1>X(<*nullchk*>E, args) where 2137 // X extends C<typargs2> { 2138 // <typarams> X(ET e, args) { 2139 // e.<typeargs1>super(args) 2140 // } 2141 // ... 2142 // } 2143 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext(); 2144 final boolean isDiamond = TreeInfo.isDiamond(tree); 2145 if (isDiamond 2146 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType)) 2147 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) { 2148 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type), 2149 instantiatedContext -> { 2150 tree.constructorType = instantiatedContext.asInstType(tree.constructorType); 2151 clazz.type = instantiatedContext.asInstType(clazz.type); 2152 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef, localEnv, argtypes, typeargtypes, pkind); 2153 }); 2154 } else { 2155 if (isDiamond && clazztype.hasTag(CLASS)) { 2156 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype); 2157 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) { 2158 // One or more types inferred in the previous steps is non-denotable. 2159 Fragment fragment = Diamond(clazztype.tsym); 2160 log.error(tree.clazz.pos(), 2161 Errors.CantApplyDiamond1( 2162 fragment, 2163 invalidDiamondArgs.size() > 1 ? 2164 DiamondInvalidArgs(invalidDiamondArgs, fragment) : 2165 DiamondInvalidArg(invalidDiamondArgs, fragment))); 2166 } 2167 // For <>(){}, inferred types must also be accessible. 2168 for (Type t : clazztype.getTypeArguments()) { 2169 rs.checkAccessibleType(env, t); 2170 } 2171 } 2172 2173 // If we already errored, be careful to avoid a further avalanche. ErrorType answers 2174 // false for isInterface call even when the original type is an interface. 2175 boolean implementing = clazztype.tsym.isInterface() || 2176 clazztype.isErroneous() && clazztype.getOriginalType().tsym.isInterface(); 2177 2178 if (implementing) { 2179 cdef.implementing = List.of(clazz); 2180 } else { 2181 cdef.extending = clazz; 2182 } 2183 2184 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2185 isSerializable(clazztype)) { 2186 localEnv.info.isSerializable = true; 2187 } 2188 2189 attribStat(cdef, localEnv); 2190 2191 List<Type> finalargtypes; 2192 // If an outer instance is given, 2193 // prefix it to the constructor arguments 2194 // and delete it from the new expression 2195 if (tree.encl != null && !clazztype.tsym.isInterface()) { 2196 tree.args = tree.args.prepend(makeNullCheck(tree.encl)); 2197 finalargtypes = argtypes.prepend(tree.encl.type); 2198 tree.encl = null; 2199 } else { 2200 finalargtypes = argtypes; 2201 } 2202 2203 // Reassign clazztype and recompute constructor. As this necessarily involves 2204 // another attribution pass for deferred types in the case of <>, replicate 2205 // them. Original arguments have right decorations already. 2206 if (isDiamond && pkind.contains(KindSelector.POLY)) { 2207 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier); 2208 } 2209 2210 clazztype = cdef.sym.type; 2211 Symbol sym = tree.constructor = rs.resolveConstructor( 2212 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes); 2213 Assert.check(!sym.kind.isResolutionError()); 2214 tree.constructor = sym; 2215 tree.constructorType = checkId(noCheckTree, 2216 clazztype, 2217 tree.constructor, 2218 localEnv, 2219 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes))); 2220 } 2221 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ? 2222 clazztype : types.createErrorType(tree.type); 2223 result = check(tree, owntype, KindSelector.VAL, resultInfo, false); 2224 chk.validate(tree.typeargs, localEnv); 2225 } 2226 2227 /** Make an attributed null check tree. 2228 */ 2229 public JCExpression makeNullCheck(JCExpression arg) { 2230 // optimization: X.this is never null; skip null check 2231 Name name = TreeInfo.name(arg); 2232 if (name == names._this || name == names._super) return arg; 2233 2234 JCTree.Tag optag = NULLCHK; 2235 JCUnary tree = make.at(arg.pos).Unary(optag, arg); 2236 tree.operator = operators.resolveUnary(arg, optag, arg.type); 2237 tree.type = arg.type; 2238 return tree; 2239 } 2240 2241 public void visitNewArray(JCNewArray tree) { 2242 Type owntype = types.createErrorType(tree.type); 2243 Env<AttrContext> localEnv = env.dup(tree); 2244 Type elemtype; 2245 if (tree.elemtype != null) { 2246 elemtype = attribType(tree.elemtype, localEnv); 2247 chk.validate(tree.elemtype, localEnv); 2248 owntype = elemtype; 2249 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) { 2250 attribExpr(l.head, localEnv, syms.intType); 2251 owntype = new ArrayType(owntype, syms.arrayClass); 2252 } 2253 } else { 2254 // we are seeing an untyped aggregate { ... } 2255 // this is allowed only if the prototype is an array 2256 if (pt().hasTag(ARRAY)) { 2257 elemtype = types.elemtype(pt()); 2258 } else { 2259 if (!pt().hasTag(ERROR)) { 2260 log.error(tree.pos(), "illegal.initializer.for.type", 2261 pt()); 2262 } 2263 elemtype = types.createErrorType(pt()); 2264 } 2265 } 2266 if (tree.elems != null) { 2267 attribExprs(tree.elems, localEnv, elemtype); 2268 owntype = new ArrayType(elemtype, syms.arrayClass); 2269 } 2270 if (!types.isReifiable(elemtype)) 2271 log.error(tree.pos(), "generic.array.creation"); 2272 result = check(tree, owntype, KindSelector.VAL, resultInfo); 2273 } 2274 2275 /* 2276 * A lambda expression can only be attributed when a target-type is available. 2277 * In addition, if the target-type is that of a functional interface whose 2278 * descriptor contains inference variables in argument position the lambda expression 2279 * is 'stuck' (see DeferredAttr). 2280 */ 2281 @Override 2282 public void visitLambda(final JCLambda that) { 2283 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2284 if (pt().hasTag(NONE)) { 2285 //lambda only allowed in assignment or method invocation/cast context 2286 log.error(that.pos(), "unexpected.lambda"); 2287 } 2288 result = that.type = types.createErrorType(pt()); 2289 return; 2290 } 2291 //create an environment for attribution of the lambda expression 2292 final Env<AttrContext> localEnv = lambdaEnv(that, env); 2293 boolean needsRecovery = 2294 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK; 2295 try { 2296 Type currentTarget = pt(); 2297 if (needsRecovery && isSerializable(currentTarget)) { 2298 localEnv.info.isSerializable = true; 2299 } 2300 List<Type> explicitParamTypes = null; 2301 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) { 2302 //attribute lambda parameters 2303 attribStats(that.params, localEnv); 2304 explicitParamTypes = TreeInfo.types(that.params); 2305 } 2306 2307 Type lambdaType; 2308 if (pt() != Type.recoveryType) { 2309 /* We need to adjust the target. If the target is an 2310 * intersection type, for example: SAM & I1 & I2 ... 2311 * the target will be updated to SAM 2312 */ 2313 currentTarget = targetChecker.visit(currentTarget, that); 2314 if (explicitParamTypes != null) { 2315 currentTarget = infer.instantiateFunctionalInterface(that, 2316 currentTarget, explicitParamTypes, resultInfo.checkContext); 2317 } 2318 currentTarget = types.removeWildcards(currentTarget); 2319 lambdaType = types.findDescriptorType(currentTarget); 2320 } else { 2321 currentTarget = Type.recoveryType; 2322 lambdaType = fallbackDescriptorType(that); 2323 } 2324 2325 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext); 2326 2327 if (lambdaType.hasTag(FORALL)) { 2328 //lambda expression target desc cannot be a generic method 2329 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target", 2330 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym)); 2331 result = that.type = types.createErrorType(pt()); 2332 return; 2333 } 2334 2335 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) { 2336 //add param type info in the AST 2337 List<Type> actuals = lambdaType.getParameterTypes(); 2338 List<JCVariableDecl> params = that.params; 2339 2340 boolean arityMismatch = false; 2341 2342 while (params.nonEmpty()) { 2343 if (actuals.isEmpty()) { 2344 //not enough actuals to perform lambda parameter inference 2345 arityMismatch = true; 2346 } 2347 //reset previously set info 2348 Type argType = arityMismatch ? 2349 syms.errType : 2350 actuals.head; 2351 params.head.vartype = make.at(params.head).Type(argType); 2352 params.head.sym = null; 2353 actuals = actuals.isEmpty() ? 2354 actuals : 2355 actuals.tail; 2356 params = params.tail; 2357 } 2358 2359 //attribute lambda parameters 2360 attribStats(that.params, localEnv); 2361 2362 if (arityMismatch) { 2363 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda")); 2364 result = that.type = types.createErrorType(currentTarget); 2365 return; 2366 } 2367 } 2368 2369 //from this point on, no recovery is needed; if we are in assignment context 2370 //we will be able to attribute the whole lambda body, regardless of errors; 2371 //if we are in a 'check' method context, and the lambda is not compatible 2372 //with the target-type, it will be recovered anyway in Attr.checkId 2373 needsRecovery = false; 2374 2375 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ? 2376 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) : 2377 new FunctionalReturnContext(resultInfo.checkContext); 2378 2379 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ? 2380 recoveryInfo : 2381 new ResultInfo(KindSelector.VAL, 2382 lambdaType.getReturnType(), funcContext); 2383 localEnv.info.returnResult = bodyResultInfo; 2384 2385 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) { 2386 attribTree(that.getBody(), localEnv, bodyResultInfo); 2387 } else { 2388 JCBlock body = (JCBlock)that.body; 2389 attribStats(body.stats, localEnv); 2390 } 2391 2392 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2393 2394 boolean isSpeculativeRound = 2395 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2396 2397 preFlow(that); 2398 flow.analyzeLambda(env, that, make, isSpeculativeRound); 2399 2400 that.type = currentTarget; //avoids recovery at this stage 2401 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext); 2402 2403 if (!isSpeculativeRound) { 2404 //add thrown types as bounds to the thrown types free variables if needed: 2405 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) { 2406 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make); 2407 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes()); 2408 2409 chk.unhandled(inferredThrownTypes, thrownTypes); 2410 } 2411 2412 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget); 2413 } 2414 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2415 } catch (Types.FunctionDescriptorLookupError ex) { 2416 JCDiagnostic cause = ex.getDiagnostic(); 2417 resultInfo.checkContext.report(that, cause); 2418 result = that.type = types.createErrorType(pt()); 2419 return; 2420 } finally { 2421 localEnv.info.scope.leave(); 2422 if (needsRecovery) { 2423 attribTree(that, env, recoveryInfo); 2424 } 2425 } 2426 } 2427 //where 2428 void preFlow(JCLambda tree) { 2429 new PostAttrAnalyzer() { 2430 @Override 2431 public void scan(JCTree tree) { 2432 if (tree == null || 2433 (tree.type != null && 2434 tree.type == Type.stuckType)) { 2435 //don't touch stuck expressions! 2436 return; 2437 } 2438 super.scan(tree); 2439 } 2440 }.scan(tree); 2441 } 2442 2443 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() { 2444 2445 @Override 2446 public Type visitClassType(ClassType t, DiagnosticPosition pos) { 2447 return t.isIntersection() ? 2448 visitIntersectionClassType((IntersectionClassType)t, pos) : t; 2449 } 2450 2451 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) { 2452 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict)); 2453 Type target = null; 2454 for (Type bound : ict.getExplicitComponents()) { 2455 TypeSymbol boundSym = bound.tsym; 2456 if (types.isFunctionalInterface(boundSym) && 2457 types.findDescriptorSymbol(boundSym) == desc) { 2458 target = bound; 2459 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) { 2460 //bound must be an interface 2461 reportIntersectionError(pos, "not.an.intf.component", boundSym); 2462 } 2463 } 2464 return target != null ? 2465 target : 2466 ict.getExplicitComponents().head; //error recovery 2467 } 2468 2469 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) { 2470 ListBuffer<Type> targs = new ListBuffer<>(); 2471 ListBuffer<Type> supertypes = new ListBuffer<>(); 2472 for (Type i : ict.interfaces_field) { 2473 if (i.isParameterized()) { 2474 targs.appendList(i.tsym.type.allparams()); 2475 } 2476 supertypes.append(i.tsym.type); 2477 } 2478 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList()); 2479 notionalIntf.allparams_field = targs.toList(); 2480 notionalIntf.tsym.flags_field |= INTERFACE; 2481 return notionalIntf.tsym; 2482 } 2483 2484 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) { 2485 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr", 2486 diags.fragment(key, args))); 2487 } 2488 }; 2489 2490 private Type fallbackDescriptorType(JCExpression tree) { 2491 switch (tree.getTag()) { 2492 case LAMBDA: 2493 JCLambda lambda = (JCLambda)tree; 2494 List<Type> argtypes = List.nil(); 2495 for (JCVariableDecl param : lambda.params) { 2496 argtypes = param.vartype != null ? 2497 argtypes.append(param.vartype.type) : 2498 argtypes.append(syms.errType); 2499 } 2500 return new MethodType(argtypes, Type.recoveryType, 2501 List.of(syms.throwableType), syms.methodClass); 2502 case REFERENCE: 2503 return new MethodType(List.<Type>nil(), Type.recoveryType, 2504 List.of(syms.throwableType), syms.methodClass); 2505 default: 2506 Assert.error("Cannot get here!"); 2507 } 2508 return null; 2509 } 2510 2511 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2512 final InferenceContext inferenceContext, final Type... ts) { 2513 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts)); 2514 } 2515 2516 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, 2517 final InferenceContext inferenceContext, final List<Type> ts) { 2518 if (inferenceContext.free(ts)) { 2519 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() { 2520 @Override 2521 public void typesInferred(InferenceContext inferenceContext) { 2522 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts)); 2523 } 2524 }); 2525 } else { 2526 for (Type t : ts) { 2527 rs.checkAccessibleType(env, t); 2528 } 2529 } 2530 } 2531 2532 /** 2533 * Lambda/method reference have a special check context that ensures 2534 * that i.e. a lambda return type is compatible with the expected 2535 * type according to both the inherited context and the assignment 2536 * context. 2537 */ 2538 class FunctionalReturnContext extends Check.NestedCheckContext { 2539 2540 FunctionalReturnContext(CheckContext enclosingContext) { 2541 super(enclosingContext); 2542 } 2543 2544 @Override 2545 public boolean compatible(Type found, Type req, Warner warn) { 2546 //return type must be compatible in both current context and assignment context 2547 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn); 2548 } 2549 2550 @Override 2551 public void report(DiagnosticPosition pos, JCDiagnostic details) { 2552 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details)); 2553 } 2554 } 2555 2556 class ExpressionLambdaReturnContext extends FunctionalReturnContext { 2557 2558 JCExpression expr; 2559 2560 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) { 2561 super(enclosingContext); 2562 this.expr = expr; 2563 } 2564 2565 @Override 2566 public boolean compatible(Type found, Type req, Warner warn) { 2567 //a void return is compatible with an expression statement lambda 2568 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) || 2569 super.compatible(found, req, warn); 2570 } 2571 } 2572 2573 /** 2574 * Lambda compatibility. Check that given return types, thrown types, parameter types 2575 * are compatible with the expected functional interface descriptor. This means that: 2576 * (i) parameter types must be identical to those of the target descriptor; (ii) return 2577 * types must be compatible with the return type of the expected descriptor. 2578 */ 2579 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) { 2580 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType()); 2581 2582 //return values have already been checked - but if lambda has no return 2583 //values, we must ensure that void/value compatibility is correct; 2584 //this amounts at checking that, if a lambda body can complete normally, 2585 //the descriptor's return type must be void 2586 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally && 2587 !returnType.hasTag(VOID) && returnType != Type.recoveryType) { 2588 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda", 2589 diags.fragment("missing.ret.val", returnType))); 2590 } 2591 2592 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes()); 2593 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) { 2594 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda")); 2595 } 2596 } 2597 2598 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a 2599 * static field and that lambda has type annotations, these annotations will 2600 * also be stored at these fake clinit methods. 2601 * 2602 * LambdaToMethod also use fake clinit methods so they can be reused. 2603 * Also as LTM is a phase subsequent to attribution, the methods from 2604 * clinits can be safely removed by LTM to save memory. 2605 */ 2606 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>(); 2607 2608 public MethodSymbol removeClinit(ClassSymbol sym) { 2609 return clinits.remove(sym); 2610 } 2611 2612 /* This method returns an environment to be used to attribute a lambda 2613 * expression. 2614 * 2615 * The owner of this environment is a method symbol. If the current owner 2616 * is not a method, for example if the lambda is used to initialize 2617 * a field, then if the field is: 2618 * 2619 * - an instance field, we use the first constructor. 2620 * - a static field, we create a fake clinit method. 2621 */ 2622 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) { 2623 Env<AttrContext> lambdaEnv; 2624 Symbol owner = env.info.scope.owner; 2625 if (owner.kind == VAR && owner.owner.kind == TYP) { 2626 //field initializer 2627 ClassSymbol enclClass = owner.enclClass(); 2628 Symbol newScopeOwner = env.info.scope.owner; 2629 /* if the field isn't static, then we can get the first constructor 2630 * and use it as the owner of the environment. This is what 2631 * LTM code is doing to look for type annotations so we are fine. 2632 */ 2633 if ((owner.flags() & STATIC) == 0) { 2634 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) { 2635 newScopeOwner = s; 2636 break; 2637 } 2638 } else { 2639 /* if the field is static then we need to create a fake clinit 2640 * method, this method can later be reused by LTM. 2641 */ 2642 MethodSymbol clinit = clinits.get(enclClass); 2643 if (clinit == null) { 2644 Type clinitType = new MethodType(List.<Type>nil(), 2645 syms.voidType, List.<Type>nil(), syms.methodClass); 2646 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE, 2647 names.clinit, clinitType, enclClass); 2648 clinit.params = List.<VarSymbol>nil(); 2649 clinits.put(enclClass, clinit); 2650 } 2651 newScopeOwner = clinit; 2652 } 2653 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner))); 2654 } else { 2655 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup())); 2656 } 2657 return lambdaEnv; 2658 } 2659 2660 @Override 2661 public void visitReference(final JCMemberReference that) { 2662 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) { 2663 if (pt().hasTag(NONE)) { 2664 //method reference only allowed in assignment or method invocation/cast context 2665 log.error(that.pos(), "unexpected.mref"); 2666 } 2667 result = that.type = types.createErrorType(pt()); 2668 return; 2669 } 2670 final Env<AttrContext> localEnv = env.dup(that); 2671 try { 2672 //attribute member reference qualifier - if this is a constructor 2673 //reference, the expected kind must be a type 2674 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that)); 2675 2676 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) { 2677 exprType = chk.checkConstructorRefType(that.expr, exprType); 2678 if (!exprType.isErroneous() && 2679 exprType.isRaw() && 2680 that.typeargs != null) { 2681 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2682 diags.fragment("mref.infer.and.explicit.params")); 2683 exprType = types.createErrorType(exprType); 2684 } 2685 } 2686 2687 if (exprType.isErroneous()) { 2688 //if the qualifier expression contains problems, 2689 //give up attribution of method reference 2690 result = that.type = exprType; 2691 return; 2692 } 2693 2694 if (TreeInfo.isStaticSelector(that.expr, names)) { 2695 //if the qualifier is a type, validate it; raw warning check is 2696 //omitted as we don't know at this stage as to whether this is a 2697 //raw selector (because of inference) 2698 chk.validate(that.expr, env, false); 2699 } 2700 2701 //attrib type-arguments 2702 List<Type> typeargtypes = List.nil(); 2703 if (that.typeargs != null) { 2704 typeargtypes = attribTypes(that.typeargs, localEnv); 2705 } 2706 2707 Type desc; 2708 Type currentTarget = pt(); 2709 boolean isTargetSerializable = 2710 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2711 isSerializable(currentTarget); 2712 if (currentTarget != Type.recoveryType) { 2713 currentTarget = types.removeWildcards(targetChecker.visit(currentTarget, that)); 2714 desc = types.findDescriptorType(currentTarget); 2715 } else { 2716 currentTarget = Type.recoveryType; 2717 desc = fallbackDescriptorType(that); 2718 } 2719 2720 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext); 2721 List<Type> argtypes = desc.getParameterTypes(); 2722 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck; 2723 2724 if (resultInfo.checkContext.inferenceContext().free(argtypes)) { 2725 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext()); 2726 } 2727 2728 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null; 2729 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save(); 2730 try { 2731 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type, 2732 that.name, argtypes, typeargtypes, referenceCheck, 2733 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser); 2734 } finally { 2735 resultInfo.checkContext.inferenceContext().rollback(saved_undet); 2736 } 2737 2738 Symbol refSym = refResult.fst; 2739 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd; 2740 2741 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing 2742 * JDK-8075541 2743 */ 2744 if (refSym.kind != MTH) { 2745 boolean targetError; 2746 switch (refSym.kind) { 2747 case ABSENT_MTH: 2748 case MISSING_ENCL: 2749 targetError = false; 2750 break; 2751 case WRONG_MTH: 2752 case WRONG_MTHS: 2753 case AMBIGUOUS: 2754 case HIDDEN: 2755 case STATICERR: 2756 targetError = true; 2757 break; 2758 default: 2759 Assert.error("unexpected result kind " + refSym.kind); 2760 targetError = false; 2761 } 2762 2763 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, 2764 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes); 2765 2766 JCDiagnostic.DiagnosticType diagKind = targetError ? 2767 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR; 2768 2769 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that, 2770 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag); 2771 2772 if (targetError && currentTarget == Type.recoveryType) { 2773 //a target error doesn't make sense during recovery stage 2774 //as we don't know what actual parameter types are 2775 result = that.type = currentTarget; 2776 return; 2777 } else { 2778 if (targetError) { 2779 resultInfo.checkContext.report(that, diag); 2780 } else { 2781 log.report(diag); 2782 } 2783 result = that.type = types.createErrorType(currentTarget); 2784 return; 2785 } 2786 } 2787 2788 that.sym = refSym.baseSymbol(); 2789 that.kind = lookupHelper.referenceKind(that.sym); 2790 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass()); 2791 2792 if (desc.getReturnType() == Type.recoveryType) { 2793 // stop here 2794 result = that.type = currentTarget; 2795 return; 2796 } 2797 2798 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) { 2799 2800 if (that.getMode() == ReferenceMode.INVOKE && 2801 TreeInfo.isStaticSelector(that.expr, names) && 2802 that.kind.isUnbound() && 2803 !desc.getParameterTypes().head.isParameterized()) { 2804 chk.checkRaw(that.expr, localEnv); 2805 } 2806 2807 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) && 2808 exprType.getTypeArguments().nonEmpty()) { 2809 //static ref with class type-args 2810 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()), 2811 diags.fragment("static.mref.with.targs")); 2812 result = that.type = types.createErrorType(currentTarget); 2813 return; 2814 } 2815 2816 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) { 2817 // Check that super-qualified symbols are not abstract (JLS) 2818 rs.checkNonAbstract(that.pos(), that.sym); 2819 } 2820 2821 if (isTargetSerializable) { 2822 chk.checkElemAccessFromSerializableLambda(that); 2823 } 2824 } 2825 2826 ResultInfo checkInfo = 2827 resultInfo.dup(newMethodTemplate( 2828 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(), 2829 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes), 2830 new FunctionalReturnContext(resultInfo.checkContext)); 2831 2832 Type refType = checkId(noCheckTree, lookupHelper.site, refSym, localEnv, checkInfo); 2833 2834 if (that.kind.isUnbound() && 2835 resultInfo.checkContext.inferenceContext().free(argtypes.head)) { 2836 //re-generate inference constraints for unbound receiver 2837 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) { 2838 //cannot happen as this has already been checked - we just need 2839 //to regenerate the inference constraints, as that has been lost 2840 //as a result of the call to inferenceContext.save() 2841 Assert.error("Can't get here"); 2842 } 2843 } 2844 2845 if (!refType.isErroneous()) { 2846 refType = types.createMethodTypeWithReturn(refType, 2847 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType())); 2848 } 2849 2850 //go ahead with standard method reference compatibility check - note that param check 2851 //is a no-op (as this has been taken care during method applicability) 2852 boolean isSpeculativeRound = 2853 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE; 2854 2855 that.type = currentTarget; //avoids recovery at this stage 2856 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound); 2857 if (!isSpeculativeRound) { 2858 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget); 2859 } 2860 result = check(that, currentTarget, KindSelector.VAL, resultInfo); 2861 } catch (Types.FunctionDescriptorLookupError ex) { 2862 JCDiagnostic cause = ex.getDiagnostic(); 2863 resultInfo.checkContext.report(that, cause); 2864 result = that.type = types.createErrorType(pt()); 2865 return; 2866 } 2867 } 2868 //where 2869 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) { 2870 //if this is a constructor reference, the expected kind must be a type 2871 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? 2872 KindSelector.VAL_TYP : KindSelector.TYP, 2873 Type.noType); 2874 } 2875 2876 2877 @SuppressWarnings("fallthrough") 2878 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) { 2879 InferenceContext inferenceContext = checkContext.inferenceContext(); 2880 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType()); 2881 2882 Type resType; 2883 switch (tree.getMode()) { 2884 case NEW: 2885 if (!tree.expr.type.isRaw()) { 2886 resType = tree.expr.type; 2887 break; 2888 } 2889 default: 2890 resType = refType.getReturnType(); 2891 } 2892 2893 Type incompatibleReturnType = resType; 2894 2895 if (returnType.hasTag(VOID)) { 2896 incompatibleReturnType = null; 2897 } 2898 2899 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) { 2900 if (resType.isErroneous() || 2901 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) { 2902 incompatibleReturnType = null; 2903 } 2904 } 2905 2906 if (incompatibleReturnType != null) { 2907 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref", 2908 diags.fragment("inconvertible.types", resType, descriptor.getReturnType()))); 2909 } else { 2910 if (inferenceContext.free(refType)) { 2911 // we need to wait for inference to finish and then replace inference vars in the referent type 2912 inferenceContext.addFreeTypeListener(List.of(refType), 2913 instantiatedContext -> { 2914 tree.referentType = instantiatedContext.asInstType(refType); 2915 }); 2916 } else { 2917 tree.referentType = refType; 2918 } 2919 } 2920 2921 if (!speculativeAttr) { 2922 List<Type> thrownTypes = inferenceContext.asUndetVars(descriptor.getThrownTypes()); 2923 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) { 2924 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes()); 2925 } 2926 } 2927 } 2928 2929 /** 2930 * Set functional type info on the underlying AST. Note: as the target descriptor 2931 * might contain inference variables, we might need to register an hook in the 2932 * current inference context. 2933 */ 2934 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr, 2935 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) { 2936 if (checkContext.inferenceContext().free(descriptorType)) { 2937 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() { 2938 public void typesInferred(InferenceContext inferenceContext) { 2939 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType), 2940 inferenceContext.asInstType(primaryTarget), checkContext); 2941 } 2942 }); 2943 } else { 2944 ListBuffer<Type> targets = new ListBuffer<>(); 2945 if (pt.hasTag(CLASS)) { 2946 if (pt.isCompound()) { 2947 targets.append(types.removeWildcards(primaryTarget)); //this goes first 2948 for (Type t : ((IntersectionClassType)pt()).interfaces_field) { 2949 if (t != primaryTarget) { 2950 targets.append(types.removeWildcards(t)); 2951 } 2952 } 2953 } else { 2954 targets.append(types.removeWildcards(primaryTarget)); 2955 } 2956 } 2957 fExpr.targets = targets.toList(); 2958 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK && 2959 pt != Type.recoveryType) { 2960 //check that functional interface class is well-formed 2961 try { 2962 /* Types.makeFunctionalInterfaceClass() may throw an exception 2963 * when it's executed post-inference. See the listener code 2964 * above. 2965 */ 2966 ClassSymbol csym = types.makeFunctionalInterfaceClass(env, 2967 names.empty, List.of(fExpr.targets.head), ABSTRACT); 2968 if (csym != null) { 2969 chk.checkImplementations(env.tree, csym, csym); 2970 try { 2971 //perform an additional functional interface check on the synthetic class, 2972 //as there may be spurious errors for raw targets - because of existing issues 2973 //with membership and inheritance (see JDK-8074570). 2974 csym.flags_field |= INTERFACE; 2975 types.findDescriptorType(csym.type); 2976 } catch (FunctionDescriptorLookupError err) { 2977 resultInfo.checkContext.report(fExpr, 2978 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head))); 2979 } 2980 } 2981 } catch (Types.FunctionDescriptorLookupError ex) { 2982 JCDiagnostic cause = ex.getDiagnostic(); 2983 resultInfo.checkContext.report(env.tree, cause); 2984 } 2985 } 2986 } 2987 } 2988 2989 public void visitParens(JCParens tree) { 2990 Type owntype = attribTree(tree.expr, env, resultInfo); 2991 result = check(tree, owntype, pkind(), resultInfo); 2992 Symbol sym = TreeInfo.symbol(tree); 2993 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK)) 2994 log.error(tree.pos(), "illegal.start.of.type"); 2995 } 2996 2997 public void visitAssign(JCAssign tree) { 2998 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo); 2999 Type capturedType = capture(owntype); 3000 attribExpr(tree.rhs, env, owntype); 3001 result = check(tree, capturedType, KindSelector.VAL, resultInfo); 3002 } 3003 3004 public void visitAssignop(JCAssignOp tree) { 3005 // Attribute arguments. 3006 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo); 3007 Type operand = attribExpr(tree.rhs, env); 3008 // Find operator. 3009 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand); 3010 if (operator.kind == MTH && 3011 !owntype.isErroneous() && 3012 !operand.isErroneous()) { 3013 chk.checkDivZero(tree.rhs.pos(), operator, operand); 3014 chk.checkCastable(tree.rhs.pos(), 3015 operator.type.getReturnType(), 3016 owntype); 3017 } 3018 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3019 } 3020 3021 public void visitUnary(JCUnary tree) { 3022 // Attribute arguments. 3023 Type argtype = (tree.getTag().isIncOrDecUnaryOp()) 3024 ? attribTree(tree.arg, env, varAssignmentInfo) 3025 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env)); 3026 3027 // Find operator. 3028 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype); 3029 Type owntype = types.createErrorType(tree.type); 3030 if (operator.kind == MTH && 3031 !argtype.isErroneous()) { 3032 owntype = (tree.getTag().isIncOrDecUnaryOp()) 3033 ? tree.arg.type 3034 : operator.type.getReturnType(); 3035 int opc = ((OperatorSymbol)operator).opcode; 3036 3037 // If the argument is constant, fold it. 3038 if (argtype.constValue() != null) { 3039 Type ctype = cfolder.fold1(opc, argtype); 3040 if (ctype != null) { 3041 owntype = cfolder.coerce(ctype, owntype); 3042 } 3043 } 3044 } 3045 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3046 } 3047 3048 public void visitBinary(JCBinary tree) { 3049 // Attribute arguments. 3050 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env)); 3051 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env)); 3052 // Find operator. 3053 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right); 3054 Type owntype = types.createErrorType(tree.type); 3055 if (operator.kind == MTH && 3056 !left.isErroneous() && 3057 !right.isErroneous()) { 3058 owntype = operator.type.getReturnType(); 3059 int opc = ((OperatorSymbol)operator).opcode; 3060 // If both arguments are constants, fold them. 3061 if (left.constValue() != null && right.constValue() != null) { 3062 Type ctype = cfolder.fold2(opc, left, right); 3063 if (ctype != null) { 3064 owntype = cfolder.coerce(ctype, owntype); 3065 } 3066 } 3067 3068 // Check that argument types of a reference ==, != are 3069 // castable to each other, (JLS 15.21). Note: unboxing 3070 // comparisons will not have an acmp* opc at this point. 3071 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) { 3072 if (!types.isCastable(left, right, new Warner(tree.pos()))) { 3073 log.error(tree.pos(), "incomparable.types", left, right); 3074 } 3075 } 3076 3077 chk.checkDivZero(tree.rhs.pos(), operator, right); 3078 } 3079 result = check(tree, owntype, KindSelector.VAL, resultInfo); 3080 } 3081 3082 public void visitTypeCast(final JCTypeCast tree) { 3083 Type clazztype = attribType(tree.clazz, env); 3084 chk.validate(tree.clazz, env, false); 3085 //a fresh environment is required for 292 inference to work properly --- 3086 //see Infer.instantiatePolymorphicSignatureInstance() 3087 Env<AttrContext> localEnv = env.dup(tree); 3088 //should we propagate the target type? 3089 final ResultInfo castInfo; 3090 JCExpression expr = TreeInfo.skipParens(tree.expr); 3091 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE)); 3092 if (isPoly) { 3093 //expression is a poly - we need to propagate target type info 3094 castInfo = new ResultInfo(KindSelector.VAL, clazztype, 3095 new Check.NestedCheckContext(resultInfo.checkContext) { 3096 @Override 3097 public boolean compatible(Type found, Type req, Warner warn) { 3098 return types.isCastable(found, req, warn); 3099 } 3100 }); 3101 } else { 3102 //standalone cast - target-type info is not propagated 3103 castInfo = unknownExprInfo; 3104 } 3105 Type exprtype = attribTree(tree.expr, localEnv, castInfo); 3106 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3107 if (exprtype.constValue() != null) 3108 owntype = cfolder.coerce(exprtype, owntype); 3109 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo); 3110 if (!isPoly) 3111 chk.checkRedundantCast(localEnv, tree); 3112 } 3113 3114 public void visitTypeTest(JCInstanceOf tree) { 3115 Type exprtype = chk.checkNullOrRefType( 3116 tree.expr.pos(), attribExpr(tree.expr, env)); 3117 Type clazztype = attribType(tree.clazz, env); 3118 if (!clazztype.hasTag(TYPEVAR)) { 3119 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype); 3120 } 3121 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) { 3122 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof"); 3123 clazztype = types.createErrorType(clazztype); 3124 } 3125 chk.validate(tree.clazz, env, false); 3126 chk.checkCastable(tree.expr.pos(), exprtype, clazztype); 3127 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo); 3128 } 3129 3130 public void visitIndexed(JCArrayAccess tree) { 3131 Type owntype = types.createErrorType(tree.type); 3132 Type atype = attribExpr(tree.indexed, env); 3133 attribExpr(tree.index, env, syms.intType); 3134 if (types.isArray(atype)) 3135 owntype = types.elemtype(atype); 3136 else if (!atype.hasTag(ERROR)) 3137 log.error(tree.pos(), "array.req.but.found", atype); 3138 if (!pkind().contains(KindSelector.VAL)) 3139 owntype = capture(owntype); 3140 result = check(tree, owntype, KindSelector.VAR, resultInfo); 3141 } 3142 3143 public void visitIdent(JCIdent tree) { 3144 Symbol sym; 3145 3146 // Find symbol 3147 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) { 3148 // If we are looking for a method, the prototype `pt' will be a 3149 // method type with the type of the call's arguments as parameters. 3150 env.info.pendingResolutionPhase = null; 3151 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments()); 3152 } else if (tree.sym != null && tree.sym.kind != VAR) { 3153 sym = tree.sym; 3154 } else { 3155 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind()); 3156 } 3157 tree.sym = sym; 3158 3159 // (1) Also find the environment current for the class where 3160 // sym is defined (`symEnv'). 3161 // Only for pre-tiger versions (1.4 and earlier): 3162 // (2) Also determine whether we access symbol out of an anonymous 3163 // class in a this or super call. This is illegal for instance 3164 // members since such classes don't carry a this$n link. 3165 // (`noOuterThisPath'). 3166 Env<AttrContext> symEnv = env; 3167 boolean noOuterThisPath = false; 3168 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class 3169 sym.kind.matches(KindSelector.VAL_MTH) && 3170 sym.owner.kind == TYP && 3171 tree.name != names._this && tree.name != names._super) { 3172 3173 // Find environment in which identifier is defined. 3174 while (symEnv.outer != null && 3175 !sym.isMemberOf(symEnv.enclClass.sym, types)) { 3176 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0) 3177 noOuterThisPath = false; 3178 symEnv = symEnv.outer; 3179 } 3180 } 3181 3182 // If symbol is a variable, ... 3183 if (sym.kind == VAR) { 3184 VarSymbol v = (VarSymbol)sym; 3185 3186 // ..., evaluate its initializer, if it has one, and check for 3187 // illegal forward reference. 3188 checkInit(tree, env, v, false); 3189 3190 // If we are expecting a variable (as opposed to a value), check 3191 // that the variable is assignable in the current environment. 3192 if (KindSelector.ASG.subset(pkind())) 3193 checkAssignable(tree.pos(), v, null, env); 3194 } 3195 3196 // In a constructor body, 3197 // if symbol is a field or instance method, check that it is 3198 // not accessed before the supertype constructor is called. 3199 if ((symEnv.info.isSelfCall || noOuterThisPath) && 3200 sym.kind.matches(KindSelector.VAL_MTH) && 3201 sym.owner.kind == TYP && 3202 (sym.flags() & STATIC) == 0) { 3203 chk.earlyRefError(tree.pos(), sym.kind == VAR ? 3204 sym : thisSym(tree.pos(), env)); 3205 } 3206 Env<AttrContext> env1 = env; 3207 if (sym.kind != ERR && sym.kind != TYP && 3208 sym.owner != null && sym.owner != env1.enclClass.sym) { 3209 // If the found symbol is inaccessible, then it is 3210 // accessed through an enclosing instance. Locate this 3211 // enclosing instance: 3212 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym)) 3213 env1 = env1.outer; 3214 } 3215 3216 if (env.info.isSerializable) { 3217 chk.checkElemAccessFromSerializableLambda(tree); 3218 } 3219 3220 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo); 3221 } 3222 3223 public void visitSelect(JCFieldAccess tree) { 3224 // Determine the expected kind of the qualifier expression. 3225 KindSelector skind = KindSelector.NIL; 3226 if (tree.name == names._this || tree.name == names._super || 3227 tree.name == names._class) 3228 { 3229 skind = KindSelector.TYP; 3230 } else { 3231 if (pkind().contains(KindSelector.PCK)) 3232 skind = KindSelector.of(skind, KindSelector.PCK); 3233 if (pkind().contains(KindSelector.TYP)) 3234 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK); 3235 if (pkind().contains(KindSelector.VAL_MTH)) 3236 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP); 3237 } 3238 3239 // Attribute the qualifier expression, and determine its symbol (if any). 3240 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly)); 3241 if (!pkind().contains(KindSelector.TYP_PCK)) 3242 site = capture(site); // Capture field access 3243 3244 // don't allow T.class T[].class, etc 3245 if (skind == KindSelector.TYP) { 3246 Type elt = site; 3247 while (elt.hasTag(ARRAY)) 3248 elt = ((ArrayType)elt).elemtype; 3249 if (elt.hasTag(TYPEVAR)) { 3250 log.error(tree.pos(), "type.var.cant.be.deref"); 3251 result = tree.type = types.createErrorType(tree.name, site.tsym, site); 3252 tree.sym = tree.type.tsym; 3253 return ; 3254 } 3255 } 3256 3257 // If qualifier symbol is a type or `super', assert `selectSuper' 3258 // for the selection. This is relevant for determining whether 3259 // protected symbols are accessible. 3260 Symbol sitesym = TreeInfo.symbol(tree.selected); 3261 boolean selectSuperPrev = env.info.selectSuper; 3262 env.info.selectSuper = 3263 sitesym != null && 3264 sitesym.name == names._super; 3265 3266 // Determine the symbol represented by the selection. 3267 env.info.pendingResolutionPhase = null; 3268 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo); 3269 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) { 3270 log.error(tree.selected.pos(), "not.encl.class", site.tsym); 3271 sym = syms.errSymbol; 3272 } 3273 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) { 3274 site = capture(site); 3275 sym = selectSym(tree, sitesym, site, env, resultInfo); 3276 } 3277 boolean varArgs = env.info.lastResolveVarargs(); 3278 tree.sym = sym; 3279 3280 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) { 3281 site = types.skipTypeVars(site, true); 3282 } 3283 3284 // If that symbol is a variable, ... 3285 if (sym.kind == VAR) { 3286 VarSymbol v = (VarSymbol)sym; 3287 3288 // ..., evaluate its initializer, if it has one, and check for 3289 // illegal forward reference. 3290 checkInit(tree, env, v, true); 3291 3292 // If we are expecting a variable (as opposed to a value), check 3293 // that the variable is assignable in the current environment. 3294 if (KindSelector.ASG.subset(pkind())) 3295 checkAssignable(tree.pos(), v, tree.selected, env); 3296 } 3297 3298 if (sitesym != null && 3299 sitesym.kind == VAR && 3300 ((VarSymbol)sitesym).isResourceVariable() && 3301 sym.kind == MTH && 3302 sym.name.equals(names.close) && 3303 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) && 3304 env.info.lint.isEnabled(LintCategory.TRY)) { 3305 log.warning(LintCategory.TRY, tree, "try.explicit.close.call"); 3306 } 3307 3308 // Disallow selecting a type from an expression 3309 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) { 3310 tree.type = check(tree.selected, pt(), 3311 sitesym == null ? 3312 KindSelector.VAL : sitesym.kind.toSelector(), 3313 new ResultInfo(KindSelector.TYP_PCK, pt())); 3314 } 3315 3316 if (isType(sitesym)) { 3317 if (sym.name == names._this) { 3318 // If `C' is the currently compiled class, check that 3319 // C.this' does not appear in a call to a super(...) 3320 if (env.info.isSelfCall && 3321 site.tsym == env.enclClass.sym) { 3322 chk.earlyRefError(tree.pos(), sym); 3323 } 3324 } else { 3325 // Check if type-qualified fields or methods are static (JLS) 3326 if ((sym.flags() & STATIC) == 0 && 3327 !env.next.tree.hasTag(REFERENCE) && 3328 sym.name != names._super && 3329 (sym.kind == VAR || sym.kind == MTH)) { 3330 rs.accessBase(rs.new StaticError(sym), 3331 tree.pos(), site, sym.name, true); 3332 } 3333 } 3334 if (!allowStaticInterfaceMethods && sitesym.isInterface() && 3335 sym.isStatic() && sym.kind == MTH) { 3336 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName); 3337 } 3338 } else if (sym.kind != ERR && 3339 (sym.flags() & STATIC) != 0 && 3340 sym.name != names._class) { 3341 // If the qualified item is not a type and the selected item is static, report 3342 // a warning. Make allowance for the class of an array type e.g. Object[].class) 3343 chk.warnStatic(tree, "static.not.qualified.by.type", 3344 sym.kind.kindName(), sym.owner); 3345 } 3346 3347 // If we are selecting an instance member via a `super', ... 3348 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) { 3349 3350 // Check that super-qualified symbols are not abstract (JLS) 3351 rs.checkNonAbstract(tree.pos(), sym); 3352 3353 if (site.isRaw()) { 3354 // Determine argument types for site. 3355 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym); 3356 if (site1 != null) site = site1; 3357 } 3358 } 3359 3360 if (env.info.isSerializable) { 3361 chk.checkElemAccessFromSerializableLambda(tree); 3362 } 3363 3364 env.info.selectSuper = selectSuperPrev; 3365 result = checkId(tree, site, sym, env, resultInfo); 3366 } 3367 //where 3368 /** Determine symbol referenced by a Select expression, 3369 * 3370 * @param tree The select tree. 3371 * @param site The type of the selected expression, 3372 * @param env The current environment. 3373 * @param resultInfo The current result. 3374 */ 3375 private Symbol selectSym(JCFieldAccess tree, 3376 Symbol location, 3377 Type site, 3378 Env<AttrContext> env, 3379 ResultInfo resultInfo) { 3380 DiagnosticPosition pos = tree.pos(); 3381 Name name = tree.name; 3382 switch (site.getTag()) { 3383 case PACKAGE: 3384 return rs.accessBase( 3385 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind), 3386 pos, location, site, name, true); 3387 case ARRAY: 3388 case CLASS: 3389 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) { 3390 return rs.resolveQualifiedMethod( 3391 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments()); 3392 } else if (name == names._this || name == names._super) { 3393 return rs.resolveSelf(pos, env, site.tsym, name); 3394 } else if (name == names._class) { 3395 // In this case, we have already made sure in 3396 // visitSelect that qualifier expression is a type. 3397 Type t = syms.classType; 3398 List<Type> typeargs = List.of(types.erasure(site)); 3399 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym); 3400 return new VarSymbol( 3401 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3402 } else { 3403 // We are seeing a plain identifier as selector. 3404 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind); 3405 sym = rs.accessBase(sym, pos, location, site, name, true); 3406 return sym; 3407 } 3408 case WILDCARD: 3409 throw new AssertionError(tree); 3410 case TYPEVAR: 3411 // Normally, site.getUpperBound() shouldn't be null. 3412 // It should only happen during memberEnter/attribBase 3413 // when determining the super type which *must* beac 3414 // done before attributing the type variables. In 3415 // other words, we are seeing this illegal program: 3416 // class B<T> extends A<T.foo> {} 3417 Symbol sym = (site.getUpperBound() != null) 3418 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo) 3419 : null; 3420 if (sym == null) { 3421 log.error(pos, "type.var.cant.be.deref"); 3422 return syms.errSymbol; 3423 } else { 3424 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ? 3425 rs.new AccessError(env, site, sym) : 3426 sym; 3427 rs.accessBase(sym2, pos, location, site, name, true); 3428 return sym; 3429 } 3430 case ERROR: 3431 // preserve identifier names through errors 3432 return types.createErrorType(name, site.tsym, site).tsym; 3433 default: 3434 // The qualifier expression is of a primitive type -- only 3435 // .class is allowed for these. 3436 if (name == names._class) { 3437 // In this case, we have already made sure in Select that 3438 // qualifier expression is a type. 3439 Type t = syms.classType; 3440 Type arg = types.boxedClass(site).type; 3441 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym); 3442 return new VarSymbol( 3443 STATIC | PUBLIC | FINAL, names._class, t, site.tsym); 3444 } else { 3445 log.error(pos, "cant.deref", site); 3446 return syms.errSymbol; 3447 } 3448 } 3449 } 3450 3451 /** Determine type of identifier or select expression and check that 3452 * (1) the referenced symbol is not deprecated 3453 * (2) the symbol's type is safe (@see checkSafe) 3454 * (3) if symbol is a variable, check that its type and kind are 3455 * compatible with the prototype and protokind. 3456 * (4) if symbol is an instance field of a raw type, 3457 * which is being assigned to, issue an unchecked warning if its 3458 * type changes under erasure. 3459 * (5) if symbol is an instance method of a raw type, issue an 3460 * unchecked warning if its argument types change under erasure. 3461 * If checks succeed: 3462 * If symbol is a constant, return its constant type 3463 * else if symbol is a method, return its result type 3464 * otherwise return its type. 3465 * Otherwise return errType. 3466 * 3467 * @param tree The syntax tree representing the identifier 3468 * @param site If this is a select, the type of the selected 3469 * expression, otherwise the type of the current class. 3470 * @param sym The symbol representing the identifier. 3471 * @param env The current environment. 3472 * @param resultInfo The expected result 3473 */ 3474 Type checkId(JCTree tree, 3475 Type site, 3476 Symbol sym, 3477 Env<AttrContext> env, 3478 ResultInfo resultInfo) { 3479 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ? 3480 checkMethodId(tree, site, sym, env, resultInfo) : 3481 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3482 } 3483 3484 Type checkMethodId(JCTree tree, 3485 Type site, 3486 Symbol sym, 3487 Env<AttrContext> env, 3488 ResultInfo resultInfo) { 3489 boolean isPolymorhicSignature = 3490 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0; 3491 return isPolymorhicSignature ? 3492 checkSigPolyMethodId(tree, site, sym, env, resultInfo) : 3493 checkMethodIdInternal(tree, site, sym, env, resultInfo); 3494 } 3495 3496 Type checkSigPolyMethodId(JCTree tree, 3497 Type site, 3498 Symbol sym, 3499 Env<AttrContext> env, 3500 ResultInfo resultInfo) { 3501 //recover original symbol for signature polymorphic methods 3502 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo); 3503 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC; 3504 return sym.type; 3505 } 3506 3507 Type checkMethodIdInternal(JCTree tree, 3508 Type site, 3509 Symbol sym, 3510 Env<AttrContext> env, 3511 ResultInfo resultInfo) { 3512 if (resultInfo.pkind.contains(KindSelector.POLY)) { 3513 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)); 3514 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo); 3515 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3516 return owntype; 3517 } else { 3518 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo); 3519 } 3520 } 3521 3522 Type checkIdInternal(JCTree tree, 3523 Type site, 3524 Symbol sym, 3525 Type pt, 3526 Env<AttrContext> env, 3527 ResultInfo resultInfo) { 3528 if (pt.isErroneous()) { 3529 return types.createErrorType(site); 3530 } 3531 Type owntype; // The computed type of this identifier occurrence. 3532 switch (sym.kind) { 3533 case TYP: 3534 // For types, the computed type equals the symbol's type, 3535 // except for two situations: 3536 owntype = sym.type; 3537 if (owntype.hasTag(CLASS)) { 3538 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym); 3539 Type ownOuter = owntype.getEnclosingType(); 3540 3541 // (a) If the symbol's type is parameterized, erase it 3542 // because no type parameters were given. 3543 // We recover generic outer type later in visitTypeApply. 3544 if (owntype.tsym.type.getTypeArguments().nonEmpty()) { 3545 owntype = types.erasure(owntype); 3546 } 3547 3548 // (b) If the symbol's type is an inner class, then 3549 // we have to interpret its outer type as a superclass 3550 // of the site type. Example: 3551 // 3552 // class Tree<A> { class Visitor { ... } } 3553 // class PointTree extends Tree<Point> { ... } 3554 // ...PointTree.Visitor... 3555 // 3556 // Then the type of the last expression above is 3557 // Tree<Point>.Visitor. 3558 else if (ownOuter.hasTag(CLASS) && site != ownOuter) { 3559 Type normOuter = site; 3560 if (normOuter.hasTag(CLASS)) { 3561 normOuter = types.asEnclosingSuper(site, ownOuter.tsym); 3562 } 3563 if (normOuter == null) // perhaps from an import 3564 normOuter = types.erasure(ownOuter); 3565 if (normOuter != ownOuter) 3566 owntype = new ClassType( 3567 normOuter, List.<Type>nil(), owntype.tsym, 3568 owntype.getMetadata()); 3569 } 3570 } 3571 break; 3572 case VAR: 3573 VarSymbol v = (VarSymbol)sym; 3574 // Test (4): if symbol is an instance field of a raw type, 3575 // which is being assigned to, issue an unchecked warning if 3576 // its type changes under erasure. 3577 if (KindSelector.ASG.subset(pkind()) && 3578 v.owner.kind == TYP && 3579 (v.flags() & STATIC) == 0 && 3580 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3581 Type s = types.asOuterSuper(site, v.owner); 3582 if (s != null && 3583 s.isRaw() && 3584 !types.isSameType(v.type, v.erasure(types))) { 3585 chk.warnUnchecked(tree.pos(), 3586 "unchecked.assign.to.var", 3587 v, s); 3588 } 3589 } 3590 // The computed type of a variable is the type of the 3591 // variable symbol, taken as a member of the site type. 3592 owntype = (sym.owner.kind == TYP && 3593 sym.name != names._this && sym.name != names._super) 3594 ? types.memberType(site, sym) 3595 : sym.type; 3596 3597 // If the variable is a constant, record constant value in 3598 // computed type. 3599 if (v.getConstValue() != null && isStaticReference(tree)) 3600 owntype = owntype.constType(v.getConstValue()); 3601 3602 if (resultInfo.pkind == KindSelector.VAL) { 3603 owntype = capture(owntype); // capture "names as expressions" 3604 } 3605 break; 3606 case MTH: { 3607 owntype = checkMethod(site, sym, 3608 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext), 3609 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(), 3610 resultInfo.pt.getTypeArguments()); 3611 break; 3612 } 3613 case PCK: case ERR: 3614 owntype = sym.type; 3615 break; 3616 default: 3617 throw new AssertionError("unexpected kind: " + sym.kind + 3618 " in tree " + tree); 3619 } 3620 3621 // Test (1): emit a `deprecation' warning if symbol is deprecated. 3622 // (for constructors, the error was given when the constructor was 3623 // resolved) 3624 3625 if (sym.name != names.init) { 3626 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym); 3627 chk.checkSunAPI(tree.pos(), sym); 3628 chk.checkProfile(tree.pos(), sym); 3629 } 3630 3631 // Test (3): if symbol is a variable, check that its type and 3632 // kind are compatible with the prototype and protokind. 3633 return check(tree, owntype, sym.kind.toSelector(), resultInfo); 3634 } 3635 3636 /** Check that variable is initialized and evaluate the variable's 3637 * initializer, if not yet done. Also check that variable is not 3638 * referenced before it is defined. 3639 * @param tree The tree making up the variable reference. 3640 * @param env The current environment. 3641 * @param v The variable's symbol. 3642 */ 3643 private void checkInit(JCTree tree, 3644 Env<AttrContext> env, 3645 VarSymbol v, 3646 boolean onlyWarning) { 3647// System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " + 3648// tree.pos + " " + v.pos + " " + 3649// Resolve.isStatic(env));//DEBUG 3650 3651 // A forward reference is diagnosed if the declaration position 3652 // of the variable is greater than the current tree position 3653 // and the tree and variable definition occur in the same class 3654 // definition. Note that writes don't count as references. 3655 // This check applies only to class and instance 3656 // variables. Local variables follow different scope rules, 3657 // and are subject to definite assignment checking. 3658 if ((env.info.enclVar == v || v.pos > tree.pos) && 3659 v.owner.kind == TYP && 3660 enclosingInitEnv(env) != null && 3661 v.owner == env.info.scope.owner.enclClass() && 3662 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) && 3663 (!env.tree.hasTag(ASSIGN) || 3664 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) { 3665 String suffix = (env.info.enclVar == v) ? 3666 "self.ref" : "forward.ref"; 3667 if (!onlyWarning || isStaticEnumField(v)) { 3668 log.error(tree.pos(), "illegal." + suffix); 3669 } else if (useBeforeDeclarationWarning) { 3670 log.warning(tree.pos(), suffix, v); 3671 } 3672 } 3673 3674 v.getConstValue(); // ensure initializer is evaluated 3675 3676 checkEnumInitializer(tree, env, v); 3677 } 3678 3679 /** 3680 * Returns the enclosing init environment associated with this env (if any). An init env 3681 * can be either a field declaration env or a static/instance initializer env. 3682 */ 3683 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) { 3684 while (true) { 3685 switch (env.tree.getTag()) { 3686 case VARDEF: 3687 JCVariableDecl vdecl = (JCVariableDecl)env.tree; 3688 if (vdecl.sym.owner.kind == TYP) { 3689 //field 3690 return env; 3691 } 3692 break; 3693 case BLOCK: 3694 if (env.next.tree.hasTag(CLASSDEF)) { 3695 //instance/static initializer 3696 return env; 3697 } 3698 break; 3699 case METHODDEF: 3700 case CLASSDEF: 3701 case TOPLEVEL: 3702 return null; 3703 } 3704 Assert.checkNonNull(env.next); 3705 env = env.next; 3706 } 3707 } 3708 3709 /** 3710 * Check for illegal references to static members of enum. In 3711 * an enum type, constructors and initializers may not 3712 * reference its static members unless they are constant. 3713 * 3714 * @param tree The tree making up the variable reference. 3715 * @param env The current environment. 3716 * @param v The variable's symbol. 3717 * @jls section 8.9 Enums 3718 */ 3719 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) { 3720 // JLS: 3721 // 3722 // "It is a compile-time error to reference a static field 3723 // of an enum type that is not a compile-time constant 3724 // (15.28) from constructors, instance initializer blocks, 3725 // or instance variable initializer expressions of that 3726 // type. It is a compile-time error for the constructors, 3727 // instance initializer blocks, or instance variable 3728 // initializer expressions of an enum constant e to refer 3729 // to itself or to an enum constant of the same type that 3730 // is declared to the right of e." 3731 if (isStaticEnumField(v)) { 3732 ClassSymbol enclClass = env.info.scope.owner.enclClass(); 3733 3734 if (enclClass == null || enclClass.owner == null) 3735 return; 3736 3737 // See if the enclosing class is the enum (or a 3738 // subclass thereof) declaring v. If not, this 3739 // reference is OK. 3740 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type)) 3741 return; 3742 3743 // If the reference isn't from an initializer, then 3744 // the reference is OK. 3745 if (!Resolve.isInitializer(env)) 3746 return; 3747 3748 log.error(tree.pos(), "illegal.enum.static.ref"); 3749 } 3750 } 3751 3752 /** Is the given symbol a static, non-constant field of an Enum? 3753 * Note: enum literals should not be regarded as such 3754 */ 3755 private boolean isStaticEnumField(VarSymbol v) { 3756 return Flags.isEnum(v.owner) && 3757 Flags.isStatic(v) && 3758 !Flags.isConstant(v) && 3759 v.name != names._class; 3760 } 3761 3762 Warner noteWarner = new Warner(); 3763 3764 /** 3765 * Check that method arguments conform to its instantiation. 3766 **/ 3767 public Type checkMethod(Type site, 3768 final Symbol sym, 3769 ResultInfo resultInfo, 3770 Env<AttrContext> env, 3771 final List<JCExpression> argtrees, 3772 List<Type> argtypes, 3773 List<Type> typeargtypes) { 3774 // Test (5): if symbol is an instance method of a raw type, issue 3775 // an unchecked warning if its argument types change under erasure. 3776 if ((sym.flags() & STATIC) == 0 && 3777 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) { 3778 Type s = types.asOuterSuper(site, sym.owner); 3779 if (s != null && s.isRaw() && 3780 !types.isSameTypes(sym.type.getParameterTypes(), 3781 sym.erasure(types).getParameterTypes())) { 3782 chk.warnUnchecked(env.tree.pos(), 3783 "unchecked.call.mbr.of.raw.type", 3784 sym, s); 3785 } 3786 } 3787 3788 if (env.info.defaultSuperCallSite != null) { 3789 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) { 3790 if (!sup.tsym.isSubClass(sym.enclClass(), types) || 3791 types.isSameType(sup, env.info.defaultSuperCallSite)) continue; 3792 List<MethodSymbol> icand_sup = 3793 types.interfaceCandidates(sup, (MethodSymbol)sym); 3794 if (icand_sup.nonEmpty() && 3795 icand_sup.head != sym && 3796 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) { 3797 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite, 3798 diags.fragment("overridden.default", sym, sup)); 3799 break; 3800 } 3801 } 3802 env.info.defaultSuperCallSite = null; 3803 } 3804 3805 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) { 3806 JCMethodInvocation app = (JCMethodInvocation)env.tree; 3807 if (app.meth.hasTag(SELECT) && 3808 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) { 3809 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site); 3810 } 3811 } 3812 3813 // Compute the identifier's instantiated type. 3814 // For methods, we need to compute the instance type by 3815 // Resolve.instantiate from the symbol's type as well as 3816 // any type arguments and value arguments. 3817 noteWarner.clear(); 3818 try { 3819 Type owntype = rs.checkMethod( 3820 env, 3821 site, 3822 sym, 3823 resultInfo, 3824 argtypes, 3825 typeargtypes, 3826 noteWarner); 3827 3828 DeferredAttr.DeferredTypeMap checkDeferredMap = 3829 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase); 3830 3831 argtypes = argtypes.map(checkDeferredMap); 3832 3833 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) { 3834 chk.warnUnchecked(env.tree.pos(), 3835 "unchecked.meth.invocation.applied", 3836 kindName(sym), 3837 sym.name, 3838 rs.methodArguments(sym.type.getParameterTypes()), 3839 rs.methodArguments(argtypes.map(checkDeferredMap)), 3840 kindName(sym.location()), 3841 sym.location()); 3842 owntype = new MethodType(owntype.getParameterTypes(), 3843 types.erasure(owntype.getReturnType()), 3844 types.erasure(owntype.getThrownTypes()), 3845 syms.methodClass); 3846 } 3847 3848 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(), 3849 resultInfo.checkContext.inferenceContext()); 3850 } catch (Infer.InferenceException ex) { 3851 //invalid target type - propagate exception outwards or report error 3852 //depending on the current check context 3853 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic()); 3854 return types.createErrorType(site); 3855 } catch (Resolve.InapplicableMethodException ex) { 3856 final JCDiagnostic diag = ex.getDiagnostic(); 3857 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) { 3858 @Override 3859 protected Pair<Symbol, JCDiagnostic> errCandidate() { 3860 return new Pair<>(sym, diag); 3861 } 3862 }; 3863 List<Type> argtypes2 = argtypes.map( 3864 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase)); 3865 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR, 3866 env.tree, sym, site, sym.name, argtypes2, typeargtypes); 3867 log.report(errDiag); 3868 return types.createErrorType(site); 3869 } 3870 } 3871 3872 public void visitLiteral(JCLiteral tree) { 3873 result = check(tree, litType(tree.typetag).constType(tree.value), 3874 KindSelector.VAL, resultInfo); 3875 } 3876 //where 3877 /** Return the type of a literal with given type tag. 3878 */ 3879 Type litType(TypeTag tag) { 3880 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()]; 3881 } 3882 3883 public void visitTypeIdent(JCPrimitiveTypeTree tree) { 3884 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo); 3885 } 3886 3887 public void visitTypeArray(JCArrayTypeTree tree) { 3888 Type etype = attribType(tree.elemtype, env); 3889 Type type = new ArrayType(etype, syms.arrayClass); 3890 result = check(tree, type, KindSelector.TYP, resultInfo); 3891 } 3892 3893 /** Visitor method for parameterized types. 3894 * Bound checking is left until later, since types are attributed 3895 * before supertype structure is completely known 3896 */ 3897 public void visitTypeApply(JCTypeApply tree) { 3898 Type owntype = types.createErrorType(tree.type); 3899 3900 // Attribute functor part of application and make sure it's a class. 3901 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env)); 3902 3903 // Attribute type parameters 3904 List<Type> actuals = attribTypes(tree.arguments, env); 3905 3906 if (clazztype.hasTag(CLASS)) { 3907 List<Type> formals = clazztype.tsym.type.getTypeArguments(); 3908 if (actuals.isEmpty()) //diamond 3909 actuals = formals; 3910 3911 if (actuals.length() == formals.length()) { 3912 List<Type> a = actuals; 3913 List<Type> f = formals; 3914 while (a.nonEmpty()) { 3915 a.head = a.head.withTypeVar(f.head); 3916 a = a.tail; 3917 f = f.tail; 3918 } 3919 // Compute the proper generic outer 3920 Type clazzOuter = clazztype.getEnclosingType(); 3921 if (clazzOuter.hasTag(CLASS)) { 3922 Type site; 3923 JCExpression clazz = TreeInfo.typeIn(tree.clazz); 3924 if (clazz.hasTag(IDENT)) { 3925 site = env.enclClass.sym.type; 3926 } else if (clazz.hasTag(SELECT)) { 3927 site = ((JCFieldAccess) clazz).selected.type; 3928 } else throw new AssertionError(""+tree); 3929 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) { 3930 if (site.hasTag(CLASS)) 3931 site = types.asOuterSuper(site, clazzOuter.tsym); 3932 if (site == null) 3933 site = types.erasure(clazzOuter); 3934 clazzOuter = site; 3935 } 3936 } 3937 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym, 3938 clazztype.getMetadata()); 3939 } else { 3940 if (formals.length() != 0) { 3941 log.error(tree.pos(), "wrong.number.type.args", 3942 Integer.toString(formals.length())); 3943 } else { 3944 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym); 3945 } 3946 owntype = types.createErrorType(tree.type); 3947 } 3948 } 3949 result = check(tree, owntype, KindSelector.TYP, resultInfo); 3950 } 3951 3952 public void visitTypeUnion(JCTypeUnion tree) { 3953 ListBuffer<Type> multicatchTypes = new ListBuffer<>(); 3954 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed 3955 for (JCExpression typeTree : tree.alternatives) { 3956 Type ctype = attribType(typeTree, env); 3957 ctype = chk.checkType(typeTree.pos(), 3958 chk.checkClassType(typeTree.pos(), ctype), 3959 syms.throwableType); 3960 if (!ctype.isErroneous()) { 3961 //check that alternatives of a union type are pairwise 3962 //unrelated w.r.t. subtyping 3963 if (chk.intersects(ctype, multicatchTypes.toList())) { 3964 for (Type t : multicatchTypes) { 3965 boolean sub = types.isSubtype(ctype, t); 3966 boolean sup = types.isSubtype(t, ctype); 3967 if (sub || sup) { 3968 //assume 'a' <: 'b' 3969 Type a = sub ? ctype : t; 3970 Type b = sub ? t : ctype; 3971 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b); 3972 } 3973 } 3974 } 3975 multicatchTypes.append(ctype); 3976 if (all_multicatchTypes != null) 3977 all_multicatchTypes.append(ctype); 3978 } else { 3979 if (all_multicatchTypes == null) { 3980 all_multicatchTypes = new ListBuffer<>(); 3981 all_multicatchTypes.appendList(multicatchTypes); 3982 } 3983 all_multicatchTypes.append(ctype); 3984 } 3985 } 3986 Type t = check(noCheckTree, types.lub(multicatchTypes.toList()), 3987 KindSelector.TYP, resultInfo); 3988 if (t.hasTag(CLASS)) { 3989 List<Type> alternatives = 3990 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList(); 3991 t = new UnionClassType((ClassType) t, alternatives); 3992 } 3993 tree.type = result = t; 3994 } 3995 3996 public void visitTypeIntersection(JCTypeIntersection tree) { 3997 attribTypes(tree.bounds, env); 3998 tree.type = result = checkIntersection(tree, tree.bounds); 3999 } 4000 4001 public void visitTypeParameter(JCTypeParameter tree) { 4002 TypeVar typeVar = (TypeVar) tree.type; 4003 4004 if (tree.annotations != null && tree.annotations.nonEmpty()) { 4005 annotateType(tree, tree.annotations); 4006 } 4007 4008 if (!typeVar.bound.isErroneous()) { 4009 //fixup type-parameter bound computed in 'attribTypeVariables' 4010 typeVar.bound = checkIntersection(tree, tree.bounds); 4011 } 4012 } 4013 4014 Type checkIntersection(JCTree tree, List<JCExpression> bounds) { 4015 Set<Type> boundSet = new HashSet<>(); 4016 if (bounds.nonEmpty()) { 4017 // accept class or interface or typevar as first bound. 4018 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false); 4019 boundSet.add(types.erasure(bounds.head.type)); 4020 if (bounds.head.type.isErroneous()) { 4021 return bounds.head.type; 4022 } 4023 else if (bounds.head.type.hasTag(TYPEVAR)) { 4024 // if first bound was a typevar, do not accept further bounds. 4025 if (bounds.tail.nonEmpty()) { 4026 log.error(bounds.tail.head.pos(), 4027 "type.var.may.not.be.followed.by.other.bounds"); 4028 return bounds.head.type; 4029 } 4030 } else { 4031 // if first bound was a class or interface, accept only interfaces 4032 // as further bounds. 4033 for (JCExpression bound : bounds.tail) { 4034 bound.type = checkBase(bound.type, bound, env, false, true, false); 4035 if (bound.type.isErroneous()) { 4036 bounds = List.of(bound); 4037 } 4038 else if (bound.type.hasTag(CLASS)) { 4039 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet); 4040 } 4041 } 4042 } 4043 } 4044 4045 if (bounds.length() == 0) { 4046 return syms.objectType; 4047 } else if (bounds.length() == 1) { 4048 return bounds.head.type; 4049 } else { 4050 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds)); 4051 // ... the variable's bound is a class type flagged COMPOUND 4052 // (see comment for TypeVar.bound). 4053 // In this case, generate a class tree that represents the 4054 // bound class, ... 4055 JCExpression extending; 4056 List<JCExpression> implementing; 4057 if (!bounds.head.type.isInterface()) { 4058 extending = bounds.head; 4059 implementing = bounds.tail; 4060 } else { 4061 extending = null; 4062 implementing = bounds; 4063 } 4064 JCClassDecl cd = make.at(tree).ClassDef( 4065 make.Modifiers(PUBLIC | ABSTRACT), 4066 names.empty, List.<JCTypeParameter>nil(), 4067 extending, implementing, List.<JCTree>nil()); 4068 4069 ClassSymbol c = (ClassSymbol)owntype.tsym; 4070 Assert.check((c.flags() & COMPOUND) != 0); 4071 cd.sym = c; 4072 c.sourcefile = env.toplevel.sourcefile; 4073 4074 // ... and attribute the bound class 4075 c.flags_field |= UNATTRIBUTED; 4076 Env<AttrContext> cenv = enter.classEnv(cd, env); 4077 typeEnvs.put(c, cenv); 4078 attribClass(c); 4079 return owntype; 4080 } 4081 } 4082 4083 public void visitWildcard(JCWildcard tree) { 4084 //- System.err.println("visitWildcard("+tree+");");//DEBUG 4085 Type type = (tree.kind.kind == BoundKind.UNBOUND) 4086 ? syms.objectType 4087 : attribType(tree.inner, env); 4088 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type), 4089 tree.kind.kind, 4090 syms.boundClass), 4091 KindSelector.TYP, resultInfo); 4092 } 4093 4094 public void visitAnnotation(JCAnnotation tree) { 4095 Assert.error("should be handled in Annotate"); 4096 } 4097 4098 public void visitAnnotatedType(JCAnnotatedType tree) { 4099 Type underlyingType = attribType(tree.getUnderlyingType(), env); 4100 this.attribAnnotationTypes(tree.annotations, env); 4101 annotateType(tree, tree.annotations); 4102 result = tree.type = underlyingType; 4103 } 4104 4105 /** 4106 * Apply the annotations to the particular type. 4107 */ 4108 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) { 4109 annotate.typeAnnotation(new Annotate.Worker() { 4110 @Override 4111 public String toString() { 4112 return "annotate " + annotations + " onto " + tree; 4113 } 4114 @Override 4115 public void run() { 4116 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations); 4117 Assert.check(annotations.size() == compounds.size()); 4118 tree.type = tree.type.annotatedType(compounds); 4119 } 4120 }); 4121 } 4122 4123 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) { 4124 if (annotations.isEmpty()) { 4125 return List.nil(); 4126 } 4127 4128 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>(); 4129 for (JCAnnotation anno : annotations) { 4130 Assert.checkNonNull(anno.attribute); 4131 buf.append((Attribute.TypeCompound) anno.attribute); 4132 } 4133 return buf.toList(); 4134 } 4135 4136 public void visitErroneous(JCErroneous tree) { 4137 if (tree.errs != null) 4138 for (JCTree err : tree.errs) 4139 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt())); 4140 result = tree.type = syms.errType; 4141 } 4142 4143 /** Default visitor method for all other trees. 4144 */ 4145 public void visitTree(JCTree tree) { 4146 throw new AssertionError(); 4147 } 4148 4149 /** 4150 * Attribute an env for either a top level tree or class declaration. 4151 */ 4152 public void attrib(Env<AttrContext> env) { 4153 if (env.tree.hasTag(TOPLEVEL)) 4154 attribTopLevel(env); 4155 else 4156 attribClass(env.tree.pos(), env.enclClass.sym); 4157 } 4158 4159 /** 4160 * Attribute a top level tree. These trees are encountered when the 4161 * package declaration has annotations. 4162 */ 4163 public void attribTopLevel(Env<AttrContext> env) { 4164 JCCompilationUnit toplevel = env.toplevel; 4165 try { 4166 annotate.flush(); 4167 } catch (CompletionFailure ex) { 4168 chk.completionError(toplevel.pos(), ex); 4169 } 4170 } 4171 4172 /** Main method: attribute class definition associated with given class symbol. 4173 * reporting completion failures at the given position. 4174 * @param pos The source position at which completion errors are to be 4175 * reported. 4176 * @param c The class symbol whose definition will be attributed. 4177 */ 4178 public void attribClass(DiagnosticPosition pos, ClassSymbol c) { 4179 try { 4180 annotate.flush(); 4181 attribClass(c); 4182 } catch (CompletionFailure ex) { 4183 chk.completionError(pos, ex); 4184 } 4185 } 4186 4187 /** Attribute class definition associated with given class symbol. 4188 * @param c The class symbol whose definition will be attributed. 4189 */ 4190 void attribClass(ClassSymbol c) throws CompletionFailure { 4191 if (c.type.hasTag(ERROR)) return; 4192 4193 // Check for cycles in the inheritance graph, which can arise from 4194 // ill-formed class files. 4195 chk.checkNonCyclic(null, c.type); 4196 4197 Type st = types.supertype(c.type); 4198 if ((c.flags_field & Flags.COMPOUND) == 0) { 4199 // First, attribute superclass. 4200 if (st.hasTag(CLASS)) 4201 attribClass((ClassSymbol)st.tsym); 4202 4203 // Next attribute owner, if it is a class. 4204 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS)) 4205 attribClass((ClassSymbol)c.owner); 4206 } 4207 4208 // The previous operations might have attributed the current class 4209 // if there was a cycle. So we test first whether the class is still 4210 // UNATTRIBUTED. 4211 if ((c.flags_field & UNATTRIBUTED) != 0) { 4212 c.flags_field &= ~UNATTRIBUTED; 4213 4214 // Get environment current at the point of class definition. 4215 Env<AttrContext> env = typeEnvs.get(c); 4216 4217 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized, 4218 // because the annotations were not available at the time the env was created. Therefore, 4219 // we look up the environment chain for the first enclosing environment for which the 4220 // lint value is set. Typically, this is the parent env, but might be further if there 4221 // are any envs created as a result of TypeParameter nodes. 4222 Env<AttrContext> lintEnv = env; 4223 while (lintEnv.info.lint == null) 4224 lintEnv = lintEnv.next; 4225 4226 // Having found the enclosing lint value, we can initialize the lint value for this class 4227 env.info.lint = lintEnv.info.lint.augment(c); 4228 4229 Lint prevLint = chk.setLint(env.info.lint); 4230 JavaFileObject prev = log.useSource(c.sourcefile); 4231 ResultInfo prevReturnRes = env.info.returnResult; 4232 4233 try { 4234 deferredLintHandler.flush(env.tree); 4235 env.info.returnResult = null; 4236 // java.lang.Enum may not be subclassed by a non-enum 4237 if (st.tsym == syms.enumSym && 4238 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0)) 4239 log.error(env.tree.pos(), "enum.no.subclassing"); 4240 4241 // Enums may not be extended by source-level classes 4242 if (st.tsym != null && 4243 ((st.tsym.flags_field & Flags.ENUM) != 0) && 4244 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) { 4245 log.error(env.tree.pos(), "enum.types.not.extensible"); 4246 } 4247 4248 if (isSerializable(c.type)) { 4249 env.info.isSerializable = true; 4250 } 4251 4252 attribClassBody(env, c); 4253 4254 chk.checkDeprecatedAnnotation(env.tree.pos(), c); 4255 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c); 4256 chk.checkFunctionalInterface((JCClassDecl) env.tree, c); 4257 } finally { 4258 env.info.returnResult = prevReturnRes; 4259 log.useSource(prev); 4260 chk.setLint(prevLint); 4261 } 4262 4263 } 4264 } 4265 4266 public void visitImport(JCImport tree) { 4267 // nothing to do 4268 } 4269 4270 /** Finish the attribution of a class. */ 4271 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) { 4272 JCClassDecl tree = (JCClassDecl)env.tree; 4273 Assert.check(c == tree.sym); 4274 4275 // Validate type parameters, supertype and interfaces. 4276 attribStats(tree.typarams, env); 4277 if (!c.isAnonymous()) { 4278 //already checked if anonymous 4279 chk.validate(tree.typarams, env); 4280 chk.validate(tree.extending, env); 4281 chk.validate(tree.implementing, env); 4282 } 4283 4284 c.markAbstractIfNeeded(types); 4285 4286 // If this is a non-abstract class, check that it has no abstract 4287 // methods or unimplemented methods of an implemented interface. 4288 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) { 4289 if (!relax) 4290 chk.checkAllDefined(tree.pos(), c); 4291 } 4292 4293 if ((c.flags() & ANNOTATION) != 0) { 4294 if (tree.implementing.nonEmpty()) 4295 log.error(tree.implementing.head.pos(), 4296 "cant.extend.intf.annotation"); 4297 if (tree.typarams.nonEmpty()) 4298 log.error(tree.typarams.head.pos(), 4299 "intf.annotation.cant.have.type.params"); 4300 4301 // If this annotation has a @Repeatable, validate 4302 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym); 4303 if (repeatable != null) { 4304 // get diagnostic position for error reporting 4305 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type); 4306 Assert.checkNonNull(cbPos); 4307 4308 chk.validateRepeatable(c, repeatable, cbPos); 4309 } 4310 } else { 4311 // Check that all extended classes and interfaces 4312 // are compatible (i.e. no two define methods with same arguments 4313 // yet different return types). (JLS 8.4.6.3) 4314 chk.checkCompatibleSupertypes(tree.pos(), c.type); 4315 if (allowDefaultMethods) { 4316 chk.checkDefaultMethodClashes(tree.pos(), c.type); 4317 } 4318 } 4319 4320 // Check that class does not import the same parameterized interface 4321 // with two different argument lists. 4322 chk.checkClassBounds(tree.pos(), c.type); 4323 4324 tree.type = c.type; 4325 4326 for (List<JCTypeParameter> l = tree.typarams; 4327 l.nonEmpty(); l = l.tail) { 4328 Assert.checkNonNull(env.info.scope.findFirst(l.head.name)); 4329 } 4330 4331 // Check that a generic class doesn't extend Throwable 4332 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType)) 4333 log.error(tree.extending.pos(), "generic.throwable"); 4334 4335 // Check that all methods which implement some 4336 // method conform to the method they implement. 4337 chk.checkImplementations(tree); 4338 4339 //check that a resource implementing AutoCloseable cannot throw InterruptedException 4340 checkAutoCloseable(tree.pos(), env, c.type); 4341 4342 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) { 4343 // Attribute declaration 4344 attribStat(l.head, env); 4345 // Check that declarations in inner classes are not static (JLS 8.1.2) 4346 // Make an exception for static constants. 4347 if (c.owner.kind != PCK && 4348 ((c.flags() & STATIC) == 0 || c.name == names.empty) && 4349 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) { 4350 Symbol sym = null; 4351 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym; 4352 if (sym == null || 4353 sym.kind != VAR || 4354 ((VarSymbol) sym).getConstValue() == null) 4355 log.error(l.head.pos(), "icls.cant.have.static.decl", c); 4356 } 4357 } 4358 4359 // Check for cycles among non-initial constructors. 4360 chk.checkCyclicConstructors(tree); 4361 4362 // Check for cycles among annotation elements. 4363 chk.checkNonCyclicElements(tree); 4364 4365 // Check for proper use of serialVersionUID 4366 if (env.info.lint.isEnabled(LintCategory.SERIAL) && 4367 isSerializable(c.type) && 4368 (c.flags() & Flags.ENUM) == 0 && 4369 checkForSerial(c)) { 4370 checkSerialVersionUID(tree, c); 4371 } 4372 if (allowTypeAnnos) { 4373 // Correctly organize the postions of the type annotations 4374 typeAnnotations.organizeTypeAnnotationsBodies(tree); 4375 4376 // Check type annotations applicability rules 4377 validateTypeAnnotations(tree, false); 4378 } 4379 } 4380 // where 4381 boolean checkForSerial(ClassSymbol c) { 4382 if ((c.flags() & ABSTRACT) == 0) { 4383 return true; 4384 } else { 4385 return c.members().anyMatch(anyNonAbstractOrDefaultMethod); 4386 } 4387 } 4388 4389 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() { 4390 @Override 4391 public boolean accepts(Symbol s) { 4392 return s.kind == MTH && 4393 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT; 4394 } 4395 }; 4396 4397 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */ 4398 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) { 4399 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) { 4400 if (types.isSameType(al.head.annotationType.type, t)) 4401 return al.head.pos(); 4402 } 4403 4404 return null; 4405 } 4406 4407 /** check if a type is a subtype of Serializable, if that is available. */ 4408 boolean isSerializable(Type t) { 4409 try { 4410 syms.serializableType.complete(); 4411 } 4412 catch (CompletionFailure e) { 4413 return false; 4414 } 4415 return types.isSubtype(t, syms.serializableType); 4416 } 4417 4418 /** Check that an appropriate serialVersionUID member is defined. */ 4419 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) { 4420 4421 // check for presence of serialVersionUID 4422 VarSymbol svuid = null; 4423 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) { 4424 if (sym.kind == VAR) { 4425 svuid = (VarSymbol)sym; 4426 break; 4427 } 4428 } 4429 4430 if (svuid == null) { 4431 log.warning(LintCategory.SERIAL, 4432 tree.pos(), "missing.SVUID", c); 4433 return; 4434 } 4435 4436 // check that it is static final 4437 if ((svuid.flags() & (STATIC | FINAL)) != 4438 (STATIC | FINAL)) 4439 log.warning(LintCategory.SERIAL, 4440 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c); 4441 4442 // check that it is long 4443 else if (!svuid.type.hasTag(LONG)) 4444 log.warning(LintCategory.SERIAL, 4445 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c); 4446 4447 // check constant 4448 else if (svuid.getConstValue() == null) 4449 log.warning(LintCategory.SERIAL, 4450 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c); 4451 } 4452 4453 private Type capture(Type type) { 4454 return types.capture(type); 4455 } 4456 4457 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) { 4458 tree.accept(new TypeAnnotationsValidator(sigOnly)); 4459 } 4460 //where 4461 private final class TypeAnnotationsValidator extends TreeScanner { 4462 4463 private final boolean sigOnly; 4464 public TypeAnnotationsValidator(boolean sigOnly) { 4465 this.sigOnly = sigOnly; 4466 } 4467 4468 public void visitAnnotation(JCAnnotation tree) { 4469 chk.validateTypeAnnotation(tree, false); 4470 super.visitAnnotation(tree); 4471 } 4472 public void visitAnnotatedType(JCAnnotatedType tree) { 4473 if (!tree.underlyingType.type.isErroneous()) { 4474 super.visitAnnotatedType(tree); 4475 } 4476 } 4477 public void visitTypeParameter(JCTypeParameter tree) { 4478 chk.validateTypeAnnotations(tree.annotations, true); 4479 scan(tree.bounds); 4480 // Don't call super. 4481 // This is needed because above we call validateTypeAnnotation with 4482 // false, which would forbid annotations on type parameters. 4483 // super.visitTypeParameter(tree); 4484 } 4485 public void visitMethodDef(JCMethodDecl tree) { 4486 if (tree.recvparam != null && 4487 !tree.recvparam.vartype.type.isErroneous()) { 4488 checkForDeclarationAnnotations(tree.recvparam.mods.annotations, 4489 tree.recvparam.vartype.type.tsym); 4490 } 4491 if (tree.restype != null && tree.restype.type != null) { 4492 validateAnnotatedType(tree.restype, tree.restype.type); 4493 } 4494 if (sigOnly) { 4495 scan(tree.mods); 4496 scan(tree.restype); 4497 scan(tree.typarams); 4498 scan(tree.recvparam); 4499 scan(tree.params); 4500 scan(tree.thrown); 4501 } else { 4502 scan(tree.defaultValue); 4503 scan(tree.body); 4504 } 4505 } 4506 public void visitVarDef(final JCVariableDecl tree) { 4507 //System.err.println("validateTypeAnnotations.visitVarDef " + tree); 4508 if (tree.sym != null && tree.sym.type != null) 4509 validateAnnotatedType(tree.vartype, tree.sym.type); 4510 scan(tree.mods); 4511 scan(tree.vartype); 4512 if (!sigOnly) { 4513 scan(tree.init); 4514 } 4515 } 4516 public void visitTypeCast(JCTypeCast tree) { 4517 if (tree.clazz != null && tree.clazz.type != null) 4518 validateAnnotatedType(tree.clazz, tree.clazz.type); 4519 super.visitTypeCast(tree); 4520 } 4521 public void visitTypeTest(JCInstanceOf tree) { 4522 if (tree.clazz != null && tree.clazz.type != null) 4523 validateAnnotatedType(tree.clazz, tree.clazz.type); 4524 super.visitTypeTest(tree); 4525 } 4526 public void visitNewClass(JCNewClass tree) { 4527 if (tree.clazz != null && tree.clazz.type != null) { 4528 if (tree.clazz.hasTag(ANNOTATED_TYPE)) { 4529 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations, 4530 tree.clazz.type.tsym); 4531 } 4532 if (tree.def != null) { 4533 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym); 4534 } 4535 4536 validateAnnotatedType(tree.clazz, tree.clazz.type); 4537 } 4538 super.visitNewClass(tree); 4539 } 4540 public void visitNewArray(JCNewArray tree) { 4541 if (tree.elemtype != null && tree.elemtype.type != null) { 4542 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) { 4543 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations, 4544 tree.elemtype.type.tsym); 4545 } 4546 validateAnnotatedType(tree.elemtype, tree.elemtype.type); 4547 } 4548 super.visitNewArray(tree); 4549 } 4550 public void visitClassDef(JCClassDecl tree) { 4551 //System.err.println("validateTypeAnnotations.visitClassDef " + tree); 4552 if (sigOnly) { 4553 scan(tree.mods); 4554 scan(tree.typarams); 4555 scan(tree.extending); 4556 scan(tree.implementing); 4557 } 4558 for (JCTree member : tree.defs) { 4559 if (member.hasTag(Tag.CLASSDEF)) { 4560 continue; 4561 } 4562 scan(member); 4563 } 4564 } 4565 public void visitBlock(JCBlock tree) { 4566 if (!sigOnly) { 4567 scan(tree.stats); 4568 } 4569 } 4570 4571 /* I would want to model this after 4572 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess) 4573 * and override visitSelect and visitTypeApply. 4574 * However, we only set the annotated type in the top-level type 4575 * of the symbol. 4576 * Therefore, we need to override each individual location where a type 4577 * can occur. 4578 */ 4579 private void validateAnnotatedType(final JCTree errtree, final Type type) { 4580 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type); 4581 4582 if (type.isPrimitiveOrVoid()) { 4583 return; 4584 } 4585 4586 JCTree enclTr = errtree; 4587 Type enclTy = type; 4588 4589 boolean repeat = true; 4590 while (repeat) { 4591 if (enclTr.hasTag(TYPEAPPLY)) { 4592 List<Type> tyargs = enclTy.getTypeArguments(); 4593 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments(); 4594 if (trargs.length() > 0) { 4595 // Nothing to do for diamonds 4596 if (tyargs.length() == trargs.length()) { 4597 for (int i = 0; i < tyargs.length(); ++i) { 4598 validateAnnotatedType(trargs.get(i), tyargs.get(i)); 4599 } 4600 } 4601 // If the lengths don't match, it's either a diamond 4602 // or some nested type that redundantly provides 4603 // type arguments in the tree. 4604 } 4605 4606 // Look at the clazz part of a generic type 4607 enclTr = ((JCTree.JCTypeApply)enclTr).clazz; 4608 } 4609 4610 if (enclTr.hasTag(SELECT)) { 4611 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression(); 4612 if (enclTy != null && 4613 !enclTy.hasTag(NONE)) { 4614 enclTy = enclTy.getEnclosingType(); 4615 } 4616 } else if (enclTr.hasTag(ANNOTATED_TYPE)) { 4617 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr; 4618 if (enclTy == null || enclTy.hasTag(NONE)) { 4619 if (at.getAnnotations().size() == 1) { 4620 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute); 4621 } else { 4622 ListBuffer<Attribute.Compound> comps = new ListBuffer<>(); 4623 for (JCAnnotation an : at.getAnnotations()) { 4624 comps.add(an.attribute); 4625 } 4626 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList()); 4627 } 4628 repeat = false; 4629 } 4630 enclTr = at.underlyingType; 4631 // enclTy doesn't need to be changed 4632 } else if (enclTr.hasTag(IDENT)) { 4633 repeat = false; 4634 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) { 4635 JCWildcard wc = (JCWildcard) enclTr; 4636 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) { 4637 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getExtendsBound()); 4638 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) { 4639 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy).getSuperBound()); 4640 } else { 4641 // Nothing to do for UNBOUND 4642 } 4643 repeat = false; 4644 } else if (enclTr.hasTag(TYPEARRAY)) { 4645 JCArrayTypeTree art = (JCArrayTypeTree) enclTr; 4646 validateAnnotatedType(art.getType(), ((ArrayType)enclTy).getComponentType()); 4647 repeat = false; 4648 } else if (enclTr.hasTag(TYPEUNION)) { 4649 JCTypeUnion ut = (JCTypeUnion) enclTr; 4650 for (JCTree t : ut.getTypeAlternatives()) { 4651 validateAnnotatedType(t, t.type); 4652 } 4653 repeat = false; 4654 } else if (enclTr.hasTag(TYPEINTERSECTION)) { 4655 JCTypeIntersection it = (JCTypeIntersection) enclTr; 4656 for (JCTree t : it.getBounds()) { 4657 validateAnnotatedType(t, t.type); 4658 } 4659 repeat = false; 4660 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE || 4661 enclTr.getKind() == JCTree.Kind.ERRONEOUS) { 4662 repeat = false; 4663 } else { 4664 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() + 4665 " within: "+ errtree + " with kind: " + errtree.getKind()); 4666 } 4667 } 4668 } 4669 4670 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations, 4671 Symbol sym) { 4672 // Ensure that no declaration annotations are present. 4673 // Note that a tree type might be an AnnotatedType with 4674 // empty annotations, if only declaration annotations were given. 4675 // This method will raise an error for such a type. 4676 for (JCAnnotation ai : annotations) { 4677 if (!ai.type.isErroneous() && 4678 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) { 4679 log.error(ai.pos(), "annotation.type.not.applicable"); 4680 } 4681 } 4682 } 4683 } 4684 4685 // <editor-fold desc="post-attribution visitor"> 4686 4687 /** 4688 * Handle missing types/symbols in an AST. This routine is useful when 4689 * the compiler has encountered some errors (which might have ended up 4690 * terminating attribution abruptly); if the compiler is used in fail-over 4691 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine 4692 * prevents NPE to be progagated during subsequent compilation steps. 4693 */ 4694 public void postAttr(JCTree tree) { 4695 new PostAttrAnalyzer().scan(tree); 4696 } 4697 4698 class PostAttrAnalyzer extends TreeScanner { 4699 4700 private void initTypeIfNeeded(JCTree that) { 4701 if (that.type == null) { 4702 if (that.hasTag(METHODDEF)) { 4703 that.type = dummyMethodType((JCMethodDecl)that); 4704 } else { 4705 that.type = syms.unknownType; 4706 } 4707 } 4708 } 4709 4710 /* Construct a dummy method type. If we have a method declaration, 4711 * and the declared return type is void, then use that return type 4712 * instead of UNKNOWN to avoid spurious error messages in lambda 4713 * bodies (see:JDK-8041704). 4714 */ 4715 private Type dummyMethodType(JCMethodDecl md) { 4716 Type restype = syms.unknownType; 4717 if (md != null && md.restype.hasTag(TYPEIDENT)) { 4718 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype; 4719 if (prim.typetag == VOID) 4720 restype = syms.voidType; 4721 } 4722 return new MethodType(List.<Type>nil(), restype, 4723 List.<Type>nil(), syms.methodClass); 4724 } 4725 private Type dummyMethodType() { 4726 return dummyMethodType(null); 4727 } 4728 4729 @Override 4730 public void scan(JCTree tree) { 4731 if (tree == null) return; 4732 if (tree instanceof JCExpression) { 4733 initTypeIfNeeded(tree); 4734 } 4735 super.scan(tree); 4736 } 4737 4738 @Override 4739 public void visitIdent(JCIdent that) { 4740 if (that.sym == null) { 4741 that.sym = syms.unknownSymbol; 4742 } 4743 } 4744 4745 @Override 4746 public void visitSelect(JCFieldAccess that) { 4747 if (that.sym == null) { 4748 that.sym = syms.unknownSymbol; 4749 } 4750 super.visitSelect(that); 4751 } 4752 4753 @Override 4754 public void visitClassDef(JCClassDecl that) { 4755 initTypeIfNeeded(that); 4756 if (that.sym == null) { 4757 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol); 4758 } 4759 super.visitClassDef(that); 4760 } 4761 4762 @Override 4763 public void visitMethodDef(JCMethodDecl that) { 4764 initTypeIfNeeded(that); 4765 if (that.sym == null) { 4766 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol); 4767 } 4768 super.visitMethodDef(that); 4769 } 4770 4771 @Override 4772 public void visitVarDef(JCVariableDecl that) { 4773 initTypeIfNeeded(that); 4774 if (that.sym == null) { 4775 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol); 4776 that.sym.adr = 0; 4777 } 4778 super.visitVarDef(that); 4779 } 4780 4781 @Override 4782 public void visitNewClass(JCNewClass that) { 4783 if (that.constructor == null) { 4784 that.constructor = new MethodSymbol(0, names.init, 4785 dummyMethodType(), syms.noSymbol); 4786 } 4787 if (that.constructorType == null) { 4788 that.constructorType = syms.unknownType; 4789 } 4790 super.visitNewClass(that); 4791 } 4792 4793 @Override 4794 public void visitAssignop(JCAssignOp that) { 4795 if (that.operator == null) { 4796 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4797 -1, syms.noSymbol); 4798 } 4799 super.visitAssignop(that); 4800 } 4801 4802 @Override 4803 public void visitBinary(JCBinary that) { 4804 if (that.operator == null) { 4805 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4806 -1, syms.noSymbol); 4807 } 4808 super.visitBinary(that); 4809 } 4810 4811 @Override 4812 public void visitUnary(JCUnary that) { 4813 if (that.operator == null) { 4814 that.operator = new OperatorSymbol(names.empty, dummyMethodType(), 4815 -1, syms.noSymbol); 4816 } 4817 super.visitUnary(that); 4818 } 4819 4820 @Override 4821 public void visitLambda(JCLambda that) { 4822 super.visitLambda(that); 4823 if (that.targets == null) { 4824 that.targets = List.nil(); 4825 } 4826 } 4827 4828 @Override 4829 public void visitReference(JCMemberReference that) { 4830 super.visitReference(that); 4831 if (that.sym == null) { 4832 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(), 4833 syms.noSymbol); 4834 } 4835 if (that.targets == null) { 4836 that.targets = List.nil(); 4837 } 4838 } 4839 } 4840 // </editor-fold> 4841} 4842