1 /*
2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29
30 import javax.lang.model.element.ElementKind;
31 import javax.tools.JavaFileObject;
32
33 import com.sun.source.tree.IdentifierTree;
34 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
35 import com.sun.source.tree.MemberSelectTree;
36 import com.sun.source.tree.TreeVisitor;
37 import com.sun.source.util.SimpleTreeVisitor;
38 import com.sun.tools.javac.code.*;
39 import com.sun.tools.javac.code.Lint.LintCategory;
40 import com.sun.tools.javac.code.Scope.WriteableScope;
41 import com.sun.tools.javac.code.Source.Feature;
42 import com.sun.tools.javac.code.Symbol.*;
43 import com.sun.tools.javac.code.Type.*;
44 import com.sun.tools.javac.code.TypeMetadata.Annotations;
45 import com.sun.tools.javac.code.Types.FunctionDescriptorLookupError;
46 import com.sun.tools.javac.comp.ArgumentAttr.LocalCacheContext;
47 import com.sun.tools.javac.comp.Check.CheckContext;
48 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
49 import com.sun.tools.javac.jvm.*;
50 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.Diamond;
51 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArg;
52 import static com.sun.tools.javac.resources.CompilerProperties.Fragments.DiamondInvalidArgs;
53 import com.sun.tools.javac.resources.CompilerProperties.Errors;
54 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
55 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
56 import com.sun.tools.javac.tree.*;
57 import com.sun.tools.javac.tree.JCTree.*;
58 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
59 import com.sun.tools.javac.util.*;
60 import com.sun.tools.javac.util.DefinedBy.Api;
61 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
62 import com.sun.tools.javac.util.JCDiagnostic.Error;
63 import com.sun.tools.javac.util.JCDiagnostic.Fragment;
64 import com.sun.tools.javac.util.JCDiagnostic.Warning;
65 import com.sun.tools.javac.util.List;
66
67 import static com.sun.tools.javac.code.Flags.*;
68 import static com.sun.tools.javac.code.Flags.ANNOTATION;
69 import static com.sun.tools.javac.code.Flags.BLOCK;
70 import static com.sun.tools.javac.code.Kinds.*;
71 import static com.sun.tools.javac.code.Kinds.Kind.*;
72 import static com.sun.tools.javac.code.TypeTag.*;
73 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
74 import static com.sun.tools.javac.tree.JCTree.Tag.*;
75 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
76
77 /** This is the main context-dependent analysis phase in GJC. It
78 * encompasses name resolution, type checking and constant folding as
79 * subtasks. Some subtasks involve auxiliary classes.
80 * @see Check
81 * @see Resolve
82 * @see ConstFold
83 * @see Infer
84 *
85 * <p><b>This is NOT part of any supported API.
86 * If you write code that depends on this, you do so at your own risk.
87 * This code and its internal interfaces are subject to change or
88 * deletion without notice.</b>
89 */
90 public class Attr extends JCTree.Visitor {
91 protected static final Context.Key<Attr> attrKey = new Context.Key<>();
92
93 final Names names;
94 final Log log;
95 final Symtab syms;
96 final Resolve rs;
97 final Operators operators;
98 final Infer infer;
99 final Analyzer analyzer;
100 final DeferredAttr deferredAttr;
101 final Check chk;
102 final Flow flow;
103 final MemberEnter memberEnter;
104 final TypeEnter typeEnter;
105 final TreeMaker make;
106 final ConstFold cfolder;
107 final Enter enter;
108 final Target target;
109 final Types types;
110 final JCDiagnostic.Factory diags;
111 final TypeAnnotations typeAnnotations;
112 final DeferredLintHandler deferredLintHandler;
113 final TypeEnvs typeEnvs;
114 final Dependencies dependencies;
115 final Annotate annotate;
116 final ArgumentAttr argumentAttr;
117
118 public static Attr instance(Context context) {
119 Attr instance = context.get(attrKey);
120 if (instance == null)
121 instance = new Attr(context);
122 return instance;
123 }
124
125 protected Attr(Context context) {
126 context.put(attrKey, this);
127
128 names = Names.instance(context);
129 log = Log.instance(context);
130 syms = Symtab.instance(context);
131 rs = Resolve.instance(context);
132 operators = Operators.instance(context);
133 chk = Check.instance(context);
134 flow = Flow.instance(context);
135 memberEnter = MemberEnter.instance(context);
136 typeEnter = TypeEnter.instance(context);
137 make = TreeMaker.instance(context);
138 enter = Enter.instance(context);
139 infer = Infer.instance(context);
140 analyzer = Analyzer.instance(context);
141 deferredAttr = DeferredAttr.instance(context);
142 cfolder = ConstFold.instance(context);
143 target = Target.instance(context);
144 types = Types.instance(context);
145 diags = JCDiagnostic.Factory.instance(context);
146 annotate = Annotate.instance(context);
147 typeAnnotations = TypeAnnotations.instance(context);
148 deferredLintHandler = DeferredLintHandler.instance(context);
149 typeEnvs = TypeEnvs.instance(context);
150 dependencies = Dependencies.instance(context);
151 argumentAttr = ArgumentAttr.instance(context);
152
153 Options options = Options.instance(context);
154
155 Source source = Source.instance(context);
156 allowStringsInSwitch = Feature.STRINGS_IN_SWITCH.allowedInSource(source);
157 allowPoly = Feature.POLY.allowedInSource(source);
158 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
159 allowLambda = Feature.LAMBDA.allowedInSource(source);
160 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
161 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
162 sourceName = source.name;
163 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
164
165 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
166 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
167 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
168 methodAttrInfo = new MethodAttrInfo();
169 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
170 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
171 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
172 }
173
174 /** Switch: support target-typing inference
175 */
176 boolean allowPoly;
177
178 /** Switch: support type annotations.
179 */
180 boolean allowTypeAnnos;
181
182 /** Switch: support lambda expressions ?
183 */
184 boolean allowLambda;
185
186 /** Switch: support default methods ?
187 */
188 boolean allowDefaultMethods;
189
190 /** Switch: static interface methods enabled?
191 */
192 boolean allowStaticInterfaceMethods;
193
194 /**
195 * Switch: warn about use of variable before declaration?
196 * RFE: 6425594
197 */
198 boolean useBeforeDeclarationWarning;
199
200 /**
201 * Switch: allow strings in switch?
202 */
203 boolean allowStringsInSwitch;
204
205 /**
206 * Switch: name of source level; used for error reporting.
207 */
208 String sourceName;
209
210 /** Check kind and type of given tree against protokind and prototype.
211 * If check succeeds, store type in tree and return it.
212 * If check fails, store errType in tree and return it.
213 * No checks are performed if the prototype is a method type.
214 * It is not necessary in this case since we know that kind and type
215 * are correct.
216 *
217 * @param tree The tree whose kind and type is checked
218 * @param found The computed type of the tree
219 * @param ownkind The computed kind of the tree
220 * @param resultInfo The expected result of the tree
221 */
222 Type check(final JCTree tree,
223 final Type found,
224 final KindSelector ownkind,
225 final ResultInfo resultInfo) {
226 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
227 Type owntype;
228 boolean shouldCheck = !found.hasTag(ERROR) &&
229 !resultInfo.pt.hasTag(METHOD) &&
230 !resultInfo.pt.hasTag(FORALL);
231 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
232 log.error(tree.pos(),
233 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
234 ownkind.kindNames()));
235 owntype = types.createErrorType(found);
236 } else if (allowPoly && inferenceContext.free(found)) {
237 //delay the check if there are inference variables in the found type
238 //this means we are dealing with a partially inferred poly expression
239 owntype = shouldCheck ? resultInfo.pt : found;
240 if (resultInfo.checkMode.installPostInferenceHook()) {
241 inferenceContext.addFreeTypeListener(List.of(found),
242 instantiatedContext -> {
243 ResultInfo pendingResult =
244 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
245 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
246 });
247 }
248 } else {
249 owntype = shouldCheck ?
250 resultInfo.check(tree, found) :
251 found;
252 }
253 if (resultInfo.checkMode.updateTreeType()) {
254 tree.type = owntype;
255 }
256 return owntype;
257 }
258
259 /** Is given blank final variable assignable, i.e. in a scope where it
260 * may be assigned to even though it is final?
261 * @param v The blank final variable.
262 * @param env The current environment.
263 */
264 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
265 Symbol owner = env.info.scope.owner;
266 // owner refers to the innermost variable, method or
267 // initializer block declaration at this point.
268 return
269 v.owner == owner
270 ||
271 ((owner.name == names.init || // i.e. we are in a constructor
272 owner.kind == VAR || // i.e. we are in a variable initializer
273 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
274 &&
275 v.owner == owner.owner
276 &&
277 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
278 }
279
280 /** Check that variable can be assigned to.
281 * @param pos The current source code position.
282 * @param v The assigned variable
283 * @param base If the variable is referred to in a Select, the part
284 * to the left of the `.', null otherwise.
285 * @param env The current environment.
286 */
287 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
288 if (v.name == names._this) {
289 log.error(pos, Errors.CantAssignValToThis);
290 } else if ((v.flags() & FINAL) != 0 &&
291 ((v.flags() & HASINIT) != 0
292 ||
293 !((base == null ||
294 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
295 isAssignableAsBlankFinal(v, env)))) {
296 if (v.isResourceVariable()) { //TWR resource
297 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
298 } else {
299 log.error(pos, Errors.CantAssignValToFinalVar(v));
300 }
301 }
302 }
303
304 /** Does tree represent a static reference to an identifier?
305 * It is assumed that tree is either a SELECT or an IDENT.
306 * We have to weed out selects from non-type names here.
307 * @param tree The candidate tree.
308 */
309 boolean isStaticReference(JCTree tree) {
310 if (tree.hasTag(SELECT)) {
311 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
312 if (lsym == null || lsym.kind != TYP) {
313 return false;
314 }
315 }
316 return true;
317 }
318
319 /** Is this symbol a type?
320 */
321 static boolean isType(Symbol sym) {
322 return sym != null && sym.kind == TYP;
323 }
324
325 /** The current `this' symbol.
326 * @param env The current environment.
327 */
328 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
329 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
330 }
331
332 /** Attribute a parsed identifier.
333 * @param tree Parsed identifier name
334 * @param topLevel The toplevel to use
335 */
336 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
337 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
338 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
339 syms.errSymbol.name,
340 null, null, null, null);
341 localEnv.enclClass.sym = syms.errSymbol;
342 return attribIdent(tree, localEnv);
343 }
344
345 /** Attribute a parsed identifier.
346 * @param tree Parsed identifier name
347 * @param env The env to use
348 */
349 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
350 return tree.accept(identAttributer, env);
351 }
352 // where
353 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
354 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
355 @Override @DefinedBy(Api.COMPILER_TREE)
356 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
357 Symbol site = visit(node.getExpression(), env);
358 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
359 return site;
360 Name name = (Name)node.getIdentifier();
361 if (site.kind == PCK) {
362 env.toplevel.packge = (PackageSymbol)site;
363 return rs.findIdentInPackage(env, (TypeSymbol)site, name,
364 KindSelector.TYP_PCK);
365 } else {
366 env.enclClass.sym = (ClassSymbol)site;
367 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
368 }
369 }
370
371 @Override @DefinedBy(Api.COMPILER_TREE)
372 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
373 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK);
374 }
375 }
376
377 public Type coerce(Type etype, Type ttype) {
378 return cfolder.coerce(etype, ttype);
379 }
380
381 public Type attribType(JCTree node, TypeSymbol sym) {
382 Env<AttrContext> env = typeEnvs.get(sym);
383 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
384 return attribTree(node, localEnv, unknownTypeInfo);
385 }
386
387 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
388 // Attribute qualifying package or class.
389 JCFieldAccess s = (JCFieldAccess)tree.qualid;
390 return attribTree(s.selected, env,
391 new ResultInfo(tree.staticImport ?
392 KindSelector.TYP : KindSelector.TYP_PCK,
393 Type.noType));
394 }
395
396 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
397 breakTree = tree;
398 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
399 try {
400 attribExpr(expr, env);
401 } catch (BreakAttr b) {
402 return b.env;
403 } catch (AssertionError ae) {
404 if (ae.getCause() instanceof BreakAttr) {
405 return ((BreakAttr)(ae.getCause())).env;
406 } else {
407 throw ae;
408 }
409 } finally {
410 breakTree = null;
411 log.useSource(prev);
412 }
413 return env;
414 }
415
416 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
417 breakTree = tree;
418 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
419 try {
420 attribStat(stmt, env);
421 } catch (BreakAttr b) {
422 return b.env;
423 } catch (AssertionError ae) {
424 if (ae.getCause() instanceof BreakAttr) {
425 return ((BreakAttr)(ae.getCause())).env;
426 } else {
427 throw ae;
428 }
429 } finally {
430 breakTree = null;
431 log.useSource(prev);
432 }
433 return env;
434 }
435
436 private JCTree breakTree = null;
437
438 private static class BreakAttr extends RuntimeException {
439 static final long serialVersionUID = -6924771130405446405L;
440 private Env<AttrContext> env;
441 private BreakAttr(Env<AttrContext> env) {
442 this.env = env;
443 }
444 }
445
446 /**
447 * Mode controlling behavior of Attr.Check
448 */
449 enum CheckMode {
450
451 NORMAL,
452
453 /**
454 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
455 * that the captured var cache in {@code InferenceContext} will be used in read-only
456 * mode when performing inference checks.
457 */
458 NO_TREE_UPDATE {
459 @Override
460 public boolean updateTreeType() {
461 return false;
462 }
463 },
464 /**
465 * Mode signalling that caller will manage free types in tree decorations.
466 */
467 NO_INFERENCE_HOOK {
468 @Override
469 public boolean installPostInferenceHook() {
470 return false;
471 }
472 };
473
474 public boolean updateTreeType() {
475 return true;
476 }
477 public boolean installPostInferenceHook() {
478 return true;
479 }
480 }
481
482
483 class ResultInfo {
484 final KindSelector pkind;
485 final Type pt;
486 final CheckContext checkContext;
487 final CheckMode checkMode;
488
489 ResultInfo(KindSelector pkind, Type pt) {
490 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
491 }
492
493 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
494 this(pkind, pt, chk.basicHandler, checkMode);
495 }
496
497 protected ResultInfo(KindSelector pkind,
498 Type pt, CheckContext checkContext) {
499 this(pkind, pt, checkContext, CheckMode.NORMAL);
500 }
501
502 protected ResultInfo(KindSelector pkind,
503 Type pt, CheckContext checkContext, CheckMode checkMode) {
504 this.pkind = pkind;
505 this.pt = pt;
506 this.checkContext = checkContext;
507 this.checkMode = checkMode;
508 }
509
510 /**
511 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
512 * @param tree The tree to be type-checked.
513 * @return true if {@ArgumentAttr} should be used.
514 */
515 protected boolean needsArgumentAttr(JCTree tree) { return false; }
516
517 protected Type check(final DiagnosticPosition pos, final Type found) {
518 return chk.checkType(pos, found, pt, checkContext);
519 }
520
521 protected ResultInfo dup(Type newPt) {
522 return new ResultInfo(pkind, newPt, checkContext, checkMode);
523 }
524
525 protected ResultInfo dup(CheckContext newContext) {
526 return new ResultInfo(pkind, pt, newContext, checkMode);
527 }
528
529 protected ResultInfo dup(Type newPt, CheckContext newContext) {
530 return new ResultInfo(pkind, newPt, newContext, checkMode);
531 }
532
533 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
534 return new ResultInfo(pkind, newPt, newContext, newMode);
535 }
536
537 protected ResultInfo dup(CheckMode newMode) {
538 return new ResultInfo(pkind, pt, checkContext, newMode);
539 }
540
541 @Override
542 public String toString() {
543 if (pt != null) {
544 return pt.toString();
545 } else {
546 return "";
547 }
548 }
549 }
550
551 class MethodAttrInfo extends ResultInfo {
552 public MethodAttrInfo() {
553 this(chk.basicHandler);
554 }
555
556 public MethodAttrInfo(CheckContext checkContext) {
557 super(KindSelector.VAL, Infer.anyPoly, checkContext);
558 }
559
560 @Override
561 protected boolean needsArgumentAttr(JCTree tree) {
562 return true;
563 }
564
565 protected ResultInfo dup(Type newPt) {
566 throw new IllegalStateException();
567 }
568
569 protected ResultInfo dup(CheckContext newContext) {
570 return new MethodAttrInfo(newContext);
571 }
572
573 protected ResultInfo dup(Type newPt, CheckContext newContext) {
574 throw new IllegalStateException();
575 }
576
577 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
578 throw new IllegalStateException();
579 }
580
581 protected ResultInfo dup(CheckMode newMode) {
582 throw new IllegalStateException();
583 }
584 }
585
586 class RecoveryInfo extends ResultInfo {
587
588 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
589 super(KindSelector.VAL, Type.recoveryType,
590 new Check.NestedCheckContext(chk.basicHandler) {
591 @Override
592 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
593 return deferredAttrContext;
594 }
595 @Override
596 public boolean compatible(Type found, Type req, Warner warn) {
597 return true;
598 }
599 @Override
600 public void report(DiagnosticPosition pos, JCDiagnostic details) {
601 chk.basicHandler.report(pos, details);
602 }
603 });
604 }
605 }
606
607 final ResultInfo statInfo;
608 final ResultInfo varAssignmentInfo;
609 final ResultInfo methodAttrInfo;
610 final ResultInfo unknownExprInfo;
611 final ResultInfo unknownTypeInfo;
612 final ResultInfo unknownTypeExprInfo;
613 final ResultInfo recoveryInfo;
614
615 Type pt() {
616 return resultInfo.pt;
617 }
618
619 KindSelector pkind() {
620 return resultInfo.pkind;
621 }
622
623 /* ************************************************************************
624 * Visitor methods
625 *************************************************************************/
626
627 /** Visitor argument: the current environment.
628 */
629 Env<AttrContext> env;
630
631 /** Visitor argument: the currently expected attribution result.
632 */
633 ResultInfo resultInfo;
634
635 /** Visitor result: the computed type.
636 */
637 Type result;
638
639 /** Visitor method: attribute a tree, catching any completion failure
640 * exceptions. Return the tree's type.
641 *
642 * @param tree The tree to be visited.
643 * @param env The environment visitor argument.
644 * @param resultInfo The result info visitor argument.
645 */
646 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
647 Env<AttrContext> prevEnv = this.env;
648 ResultInfo prevResult = this.resultInfo;
649 try {
650 this.env = env;
651 this.resultInfo = resultInfo;
652 if (resultInfo.needsArgumentAttr(tree)) {
653 result = argumentAttr.attribArg(tree, env);
654 } else {
655 tree.accept(this);
656 }
657 if (tree == breakTree &&
658 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
659 throw new BreakAttr(copyEnv(env));
660 }
661 return result;
662 } catch (CompletionFailure ex) {
663 tree.type = syms.errType;
664 return chk.completionError(tree.pos(), ex);
665 } finally {
666 this.env = prevEnv;
667 this.resultInfo = prevResult;
668 }
669 }
670
671 Env<AttrContext> copyEnv(Env<AttrContext> env) {
672 Env<AttrContext> newEnv =
673 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
674 if (newEnv.outer != null) {
675 newEnv.outer = copyEnv(newEnv.outer);
676 }
677 return newEnv;
678 }
679
680 WriteableScope copyScope(WriteableScope sc) {
681 WriteableScope newScope = WriteableScope.create(sc.owner);
682 List<Symbol> elemsList = List.nil();
683 for (Symbol sym : sc.getSymbols()) {
684 elemsList = elemsList.prepend(sym);
685 }
686 for (Symbol s : elemsList) {
687 newScope.enter(s);
688 }
689 return newScope;
690 }
691
692 /** Derived visitor method: attribute an expression tree.
693 */
694 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
695 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
696 }
697
698 /** Derived visitor method: attribute an expression tree with
699 * no constraints on the computed type.
700 */
701 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
702 return attribTree(tree, env, unknownExprInfo);
703 }
704
705 /** Derived visitor method: attribute a type tree.
706 */
707 public Type attribType(JCTree tree, Env<AttrContext> env) {
708 Type result = attribType(tree, env, Type.noType);
709 return result;
710 }
711
712 /** Derived visitor method: attribute a type tree.
713 */
714 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
715 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
716 return result;
717 }
718
719 /** Derived visitor method: attribute a statement or definition tree.
720 */
721 public Type attribStat(JCTree tree, Env<AttrContext> env) {
722 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
723 try {
724 return attribTree(tree, env, statInfo);
725 } finally {
726 analyzer.analyzeIfNeeded(tree, analyzeEnv);
727 }
728 }
729
730 /** Attribute a list of expressions, returning a list of types.
731 */
732 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
733 ListBuffer<Type> ts = new ListBuffer<>();
734 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
735 ts.append(attribExpr(l.head, env, pt));
736 return ts.toList();
737 }
738
739 /** Attribute a list of statements, returning nothing.
740 */
741 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
742 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
743 attribStat(l.head, env);
744 }
745
746 /** Attribute the arguments in a method call, returning the method kind.
747 */
748 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
749 KindSelector kind = initialKind;
750 for (JCExpression arg : trees) {
751 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
752 if (argtype.hasTag(DEFERRED)) {
753 kind = KindSelector.of(KindSelector.POLY, kind);
754 }
755 argtypes.append(argtype);
756 }
757 return kind;
758 }
759
760 /** Attribute a type argument list, returning a list of types.
761 * Caller is responsible for calling checkRefTypes.
762 */
763 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
764 ListBuffer<Type> argtypes = new ListBuffer<>();
765 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
766 argtypes.append(attribType(l.head, env));
767 return argtypes.toList();
768 }
769
770 /** Attribute a type argument list, returning a list of types.
771 * Check that all the types are references.
772 */
773 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
774 List<Type> types = attribAnyTypes(trees, env);
775 return chk.checkRefTypes(trees, types);
776 }
777
778 /**
779 * Attribute type variables (of generic classes or methods).
780 * Compound types are attributed later in attribBounds.
781 * @param typarams the type variables to enter
782 * @param env the current environment
783 */
784 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
785 for (JCTypeParameter tvar : typarams) {
786 TypeVar a = (TypeVar)tvar.type;
787 a.tsym.flags_field |= UNATTRIBUTED;
788 a.bound = Type.noType;
789 if (!tvar.bounds.isEmpty()) {
790 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
791 for (JCExpression bound : tvar.bounds.tail)
792 bounds = bounds.prepend(attribType(bound, env));
793 types.setBounds(a, bounds.reverse());
794 } else {
795 // if no bounds are given, assume a single bound of
796 // java.lang.Object.
797 types.setBounds(a, List.of(syms.objectType));
798 }
799 a.tsym.flags_field &= ~UNATTRIBUTED;
800 }
801 for (JCTypeParameter tvar : typarams) {
802 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
803 }
804 }
805
806 /**
807 * Attribute the type references in a list of annotations.
808 */
809 void attribAnnotationTypes(List<JCAnnotation> annotations,
810 Env<AttrContext> env) {
811 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
812 JCAnnotation a = al.head;
813 attribType(a.annotationType, env);
814 }
815 }
816
817 /**
818 * Attribute a "lazy constant value".
819 * @param env The env for the const value
820 * @param variable The initializer for the const value
821 * @param type The expected type, or null
822 * @see VarSymbol#setLazyConstValue
823 */
824 public Object attribLazyConstantValue(Env<AttrContext> env,
825 JCVariableDecl variable,
826 Type type) {
827
828 DiagnosticPosition prevLintPos
829 = deferredLintHandler.setPos(variable.pos());
830
831 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
832 try {
833 Type itype = attribExpr(variable.init, env, type);
834 if (variable.isImplicitlyTyped()) {
835 //fixup local variable type
836 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
837 }
838 if (itype.constValue() != null) {
839 return coerce(itype, type).constValue();
840 } else {
841 return null;
842 }
843 } finally {
844 log.useSource(prevSource);
845 deferredLintHandler.setPos(prevLintPos);
846 }
847 }
848
849 /** Attribute type reference in an `extends' or `implements' clause.
850 * Supertypes of anonymous inner classes are usually already attributed.
851 *
852 * @param tree The tree making up the type reference.
853 * @param env The environment current at the reference.
854 * @param classExpected true if only a class is expected here.
855 * @param interfaceExpected true if only an interface is expected here.
856 */
857 Type attribBase(JCTree tree,
858 Env<AttrContext> env,
859 boolean classExpected,
860 boolean interfaceExpected,
861 boolean checkExtensible) {
862 Type t = tree.type != null ?
863 tree.type :
864 attribType(tree, env);
865 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
866 }
867 Type checkBase(Type t,
868 JCTree tree,
869 Env<AttrContext> env,
870 boolean classExpected,
871 boolean interfaceExpected,
872 boolean checkExtensible) {
873 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
874 (((JCTypeApply) tree).clazz).pos() : tree.pos();
875 if (t.tsym.isAnonymous()) {
876 log.error(pos, Errors.CantInheritFromAnon);
877 return types.createErrorType(t);
878 }
879 if (t.isErroneous())
880 return t;
881 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
882 // check that type variable is already visible
883 if (t.getUpperBound() == null) {
884 log.error(pos, Errors.IllegalForwardRef);
885 return types.createErrorType(t);
886 }
887 } else {
888 t = chk.checkClassType(pos, t, checkExtensible);
889 }
890 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
891 log.error(pos, Errors.IntfExpectedHere);
892 // return errType is necessary since otherwise there might
893 // be undetected cycles which cause attribution to loop
894 return types.createErrorType(t);
895 } else if (checkExtensible &&
896 classExpected &&
897 (t.tsym.flags() & INTERFACE) != 0) {
898 log.error(pos, Errors.NoIntfExpectedHere);
899 return types.createErrorType(t);
900 }
901 if (checkExtensible &&
902 ((t.tsym.flags() & FINAL) != 0)) {
903 log.error(pos,
904 Errors.CantInheritFromFinal(t.tsym));
905 }
906 chk.checkNonCyclic(pos, t);
907 return t;
908 }
909
910 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
911 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
912 id.type = env.info.scope.owner.enclClass().type;
913 id.sym = env.info.scope.owner.enclClass();
914 return id.type;
915 }
916
917 public void visitClassDef(JCClassDecl tree) {
918 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
919 Optional.ofNullable(env.info.isSpeculative ?
920 argumentAttr.withLocalCacheContext() : null);
921 try {
922 // Local and anonymous classes have not been entered yet, so we need to
923 // do it now.
924 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
925 enter.classEnter(tree, env);
926 } else {
927 // If this class declaration is part of a class level annotation,
928 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
929 // order to simplify later steps and allow for sensible error
930 // messages.
931 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
932 enter.classEnter(tree, env);
933 }
934
935 ClassSymbol c = tree.sym;
936 if (c == null) {
937 // exit in case something drastic went wrong during enter.
938 result = null;
939 } else {
940 // make sure class has been completed:
941 c.complete();
942
943 // If this class appears as an anonymous class
944 // in a superclass constructor call
945 // disable implicit outer instance from being passed.
946 // (This would be an illegal access to "this before super").
947 if (env.info.isSelfCall &&
948 env.tree.hasTag(NEWCLASS)) {
949 c.flags_field |= NOOUTERTHIS;
950 }
951 attribClass(tree.pos(), c);
952 result = tree.type = c.type;
953 }
954 } finally {
955 localCacheContext.ifPresent(LocalCacheContext::leave);
956 }
957 }
958
959 public void visitMethodDef(JCMethodDecl tree) {
960 MethodSymbol m = tree.sym;
961 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
962
963 Lint lint = env.info.lint.augment(m);
964 Lint prevLint = chk.setLint(lint);
965 MethodSymbol prevMethod = chk.setMethod(m);
966 try {
967 deferredLintHandler.flush(tree.pos());
968 chk.checkDeprecatedAnnotation(tree.pos(), m);
969
970
971 // Create a new environment with local scope
972 // for attributing the method.
973 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
974 localEnv.info.lint = lint;
975
976 attribStats(tree.typarams, localEnv);
977
978 // If we override any other methods, check that we do so properly.
979 // JLS ???
980 if (m.isStatic()) {
981 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
982 } else {
983 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
984 }
985 chk.checkOverride(env, tree, m);
986
987 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
988 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
989 }
990
991 // Enter all type parameters into the local method scope.
992 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
993 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
994
995 ClassSymbol owner = env.enclClass.sym;
996 if ((owner.flags() & ANNOTATION) != 0 &&
997 (tree.params.nonEmpty() ||
998 tree.recvparam != null))
999 log.error(tree.params.nonEmpty() ?
1000 tree.params.head.pos() :
1001 tree.recvparam.pos(),
1002 Errors.IntfAnnotationMembersCantHaveParams);
1003
1004 // Attribute all value parameters.
1005 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1006 attribStat(l.head, localEnv);
1007 }
1008
1009 chk.checkVarargsMethodDecl(localEnv, tree);
1010
1011 // Check that type parameters are well-formed.
1012 chk.validate(tree.typarams, localEnv);
1013
1014 // Check that result type is well-formed.
1015 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1016 chk.validate(tree.restype, localEnv);
1017
1018 // Check that receiver type is well-formed.
1019 if (tree.recvparam != null) {
1020 // Use a new environment to check the receiver parameter.
1021 // Otherwise I get "might not have been initialized" errors.
1022 // Is there a better way?
1023 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1024 attribType(tree.recvparam, newEnv);
1025 chk.validate(tree.recvparam, newEnv);
1026 }
1027
1028 // annotation method checks
1029 if ((owner.flags() & ANNOTATION) != 0) {
1030 // annotation method cannot have throws clause
1031 if (tree.thrown.nonEmpty()) {
1032 log.error(tree.thrown.head.pos(),
1033 Errors.ThrowsNotAllowedInIntfAnnotation);
1034 }
1035 // annotation method cannot declare type-parameters
1036 if (tree.typarams.nonEmpty()) {
1037 log.error(tree.typarams.head.pos(),
1038 Errors.IntfAnnotationMembersCantHaveTypeParams);
1039 }
1040 // validate annotation method's return type (could be an annotation type)
1041 chk.validateAnnotationType(tree.restype);
1042 // ensure that annotation method does not clash with members of Object/Annotation
1043 chk.validateAnnotationMethod(tree.pos(), m);
1044 }
1045
1046 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1047 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1048
1049 if (tree.body == null) {
1050 // Empty bodies are only allowed for
1051 // abstract, native, or interface methods, or for methods
1052 // in a retrofit signature class.
1053 if (tree.defaultValue != null) {
1054 if ((owner.flags() & ANNOTATION) == 0)
1055 log.error(tree.pos(),
1056 Errors.DefaultAllowedInIntfAnnotationMember);
1057 }
1058 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1059 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1060 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1061 if ((owner.flags() & INTERFACE) != 0) {
1062 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1063 } else {
1064 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1065 }
1066 } else if ((tree.mods.flags & NATIVE) != 0) {
1067 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1068 } else {
1069 // Add an implicit super() call unless an explicit call to
1070 // super(...) or this(...) is given
1071 // or we are compiling class java.lang.Object.
1072 if (tree.name == names.init && owner.type != syms.objectType) {
1073 JCBlock body = tree.body;
1074 if (body.stats.isEmpty() ||
1075 !TreeInfo.isSelfCall(body.stats.head)) {
1076 body.stats = body.stats.
1077 prepend(typeEnter.SuperCall(make.at(body.pos),
1078 List.nil(),
1079 List.nil(),
1080 false));
1081 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1082 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1083 TreeInfo.isSuperCall(body.stats.head)) {
1084 // enum constructors are not allowed to call super
1085 // directly, so make sure there aren't any super calls
1086 // in enum constructors, except in the compiler
1087 // generated one.
1088 log.error(tree.body.stats.head.pos(),
1089 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1090 }
1091 }
1092
1093 // Attribute all type annotations in the body
1094 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1095 annotate.flush();
1096
1097 // Attribute method body.
1098 attribStat(tree.body, localEnv);
1099 }
1100
1101 localEnv.info.scope.leave();
1102 result = tree.type = m.type;
1103 } finally {
1104 chk.setLint(prevLint);
1105 chk.setMethod(prevMethod);
1106 }
1107 }
1108
1109 public void visitVarDef(JCVariableDecl tree) {
1110 // Local variables have not been entered yet, so we need to do it now:
1111 if (env.info.scope.owner.kind == MTH) {
1112 if (tree.sym != null) {
1113 // parameters have already been entered
1114 env.info.scope.enter(tree.sym);
1115 } else {
1116 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1117 if (tree.init == null) {
1118 //cannot use 'var' without initializer
1119 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1120 tree.vartype = make.Erroneous();
1121 } else {
1122 Fragment msg = canInferLocalVarType(tree);
1123 if (msg != null) {
1124 //cannot use 'var' with initializer which require an explicit target
1125 //(e.g. lambda, method reference, array initializer).
1126 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1127 tree.vartype = make.Erroneous();
1128 }
1129 }
1130 }
1131 try {
1132 annotate.blockAnnotations();
1133 memberEnter.memberEnter(tree, env);
1134 } finally {
1135 annotate.unblockAnnotations();
1136 }
1137 }
1138 } else {
1139 if (tree.init != null) {
1140 // Field initializer expression need to be entered.
1141 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1142 annotate.flush();
1143 }
1144 }
1145
1146 VarSymbol v = tree.sym;
1147 Lint lint = env.info.lint.augment(v);
1148 Lint prevLint = chk.setLint(lint);
1149
1150 // Check that the variable's declared type is well-formed.
1151 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1152 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1153 (tree.sym.flags() & PARAMETER) != 0;
1154 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1155
1156 try {
1157 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1158 deferredLintHandler.flush(tree.pos());
1159 chk.checkDeprecatedAnnotation(tree.pos(), v);
1160
1161 if (tree.init != null) {
1162 if ((v.flags_field & FINAL) == 0 ||
1163 !memberEnter.needsLazyConstValue(tree.init)) {
1164 // Not a compile-time constant
1165 // Attribute initializer in a new environment
1166 // with the declared variable as owner.
1167 // Check that initializer conforms to variable's declared type.
1168 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1169 initEnv.info.lint = lint;
1170 // In order to catch self-references, we set the variable's
1171 // declaration position to maximal possible value, effectively
1172 // marking the variable as undefined.
1173 initEnv.info.enclVar = v;
1174 attribExpr(tree.init, initEnv, v.type);
1175 if (tree.isImplicitlyTyped()) {
1176 //fixup local variable type
1177 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1178 }
1179 }
1180 if (tree.isImplicitlyTyped()) {
1181 setSyntheticVariableType(tree, v.type);
1182 }
1183 }
1184 result = tree.type = v.type;
1185 }
1186 finally {
1187 chk.setLint(prevLint);
1188 }
1189 }
1190
1191 Fragment canInferLocalVarType(JCVariableDecl tree) {
1192 LocalInitScanner lis = new LocalInitScanner();
1193 lis.scan(tree.init);
1194 return lis.badInferenceMsg;
1195 }
1196
1197 static class LocalInitScanner extends TreeScanner {
1198 Fragment badInferenceMsg = null;
1199 boolean needsTarget = true;
1200
1201 @Override
1202 public void visitNewArray(JCNewArray tree) {
1203 if (tree.elemtype == null && needsTarget) {
1204 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1205 }
1206 }
1207
1208 @Override
1209 public void visitLambda(JCLambda tree) {
1210 if (needsTarget) {
1211 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1212 }
1213 }
1214
1215 @Override
1216 public void visitTypeCast(JCTypeCast tree) {
1217 boolean prevNeedsTarget = needsTarget;
1218 try {
1219 needsTarget = false;
1220 super.visitTypeCast(tree);
1221 } finally {
1222 needsTarget = prevNeedsTarget;
1223 }
1224 }
1225
1226 @Override
1227 public void visitReference(JCMemberReference tree) {
1228 if (needsTarget) {
1229 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1230 }
1231 }
1232
1233 @Override
1234 public void visitNewClass(JCNewClass tree) {
1235 boolean prevNeedsTarget = needsTarget;
1236 try {
1237 needsTarget = false;
1238 super.visitNewClass(tree);
1239 } finally {
1240 needsTarget = prevNeedsTarget;
1241 }
1242 }
1243
1244 @Override
1245 public void visitApply(JCMethodInvocation tree) {
1246 boolean prevNeedsTarget = needsTarget;
1247 try {
1248 needsTarget = false;
1249 super.visitApply(tree);
1250 } finally {
1251 needsTarget = prevNeedsTarget;
1252 }
1253 }
1254 }
1255
1256 public void visitSkip(JCSkip tree) {
1257 result = null;
1258 }
1259
1260 public void visitBlock(JCBlock tree) {
1261 if (env.info.scope.owner.kind == TYP) {
1262 // Block is a static or instance initializer;
1263 // let the owner of the environment be a freshly
1264 // created BLOCK-method.
1265 Symbol fakeOwner =
1266 new MethodSymbol(tree.flags | BLOCK |
1267 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1268 env.info.scope.owner);
1269 final Env<AttrContext> localEnv =
1270 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1271
1272 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1273 // Attribute all type annotations in the block
1274 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1275 annotate.flush();
1276 attribStats(tree.stats, localEnv);
1277
1278 {
1279 // Store init and clinit type annotations with the ClassSymbol
1280 // to allow output in Gen.normalizeDefs.
1281 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1282 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1283 if ((tree.flags & STATIC) != 0) {
1284 cs.appendClassInitTypeAttributes(tas);
1285 } else {
1286 cs.appendInitTypeAttributes(tas);
1287 }
1288 }
1289 } else {
1290 // Create a new local environment with a local scope.
1291 Env<AttrContext> localEnv =
1292 env.dup(tree, env.info.dup(env.info.scope.dup()));
1293 try {
1294 attribStats(tree.stats, localEnv);
1295 } finally {
1296 localEnv.info.scope.leave();
1297 }
1298 }
1299 result = null;
1300 }
1301
1302 public void visitDoLoop(JCDoWhileLoop tree) {
1303 attribStat(tree.body, env.dup(tree));
1304 attribExpr(tree.cond, env, syms.booleanType);
1305 result = null;
1306 }
1307
1308 public void visitWhileLoop(JCWhileLoop tree) {
1309 attribExpr(tree.cond, env, syms.booleanType);
1310 attribStat(tree.body, env.dup(tree));
1311 result = null;
1312 }
1313
1314 public void visitForLoop(JCForLoop tree) {
1315 Env<AttrContext> loopEnv =
1316 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1317 try {
1318 attribStats(tree.init, loopEnv);
1319 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1320 loopEnv.tree = tree; // before, we were not in loop!
1321 attribStats(tree.step, loopEnv);
1322 attribStat(tree.body, loopEnv);
1323 result = null;
1324 }
1325 finally {
1326 loopEnv.info.scope.leave();
1327 }
1328 }
1329
1330 public void visitForeachLoop(JCEnhancedForLoop tree) {
1331 Env<AttrContext> loopEnv =
1332 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1333 try {
1334 //the Formal Parameter of a for-each loop is not in the scope when
1335 //attributing the for-each expression; we mimick this by attributing
1336 //the for-each expression first (against original scope).
1337 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1338 chk.checkNonVoid(tree.pos(), exprType);
1339 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1340 if (elemtype == null) {
1341 // or perhaps expr implements Iterable<T>?
1342 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1343 if (base == null) {
1344 log.error(tree.expr.pos(),
1345 Errors.ForeachNotApplicableToType(exprType,
1346 Fragments.TypeReqArrayOrIterable));
1347 elemtype = types.createErrorType(exprType);
1348 } else {
1349 List<Type> iterableParams = base.allparams();
1350 elemtype = iterableParams.isEmpty()
1351 ? syms.objectType
1352 : types.wildUpperBound(iterableParams.head);
1353 }
1354 }
1355 if (tree.var.isImplicitlyTyped()) {
1356 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1357 setSyntheticVariableType(tree.var, inferredType);
1358 }
1359 attribStat(tree.var, loopEnv);
1360 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1361 loopEnv.tree = tree; // before, we were not in loop!
1362 attribStat(tree.body, loopEnv);
1363 result = null;
1364 }
1365 finally {
1366 loopEnv.info.scope.leave();
1367 }
1368 }
1369
1370 public void visitLabelled(JCLabeledStatement tree) {
1371 // Check that label is not used in an enclosing statement
1372 Env<AttrContext> env1 = env;
1373 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1374 if (env1.tree.hasTag(LABELLED) &&
1375 ((JCLabeledStatement) env1.tree).label == tree.label) {
1376 log.error(tree.pos(),
1377 Errors.LabelAlreadyInUse(tree.label));
1378 break;
1379 }
1380 env1 = env1.next;
1381 }
1382
1383 attribStat(tree.body, env.dup(tree));
1384 result = null;
1385 }
1386
1387 public void visitSwitch(JCSwitch tree) {
1388 Type seltype = attribExpr(tree.selector, env);
1389
1390 Env<AttrContext> switchEnv =
1391 env.dup(tree, env.info.dup(env.info.scope.dup()));
1392
1393 try {
1394
1395 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1396 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
1397 if (stringSwitch && !allowStringsInSwitch) {
1398 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.selector.pos(), Feature.STRINGS_IN_SWITCH.error(sourceName));
1399 }
1400 if (!enumSwitch && !stringSwitch)
1401 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1402
1403 // Attribute all cases and
1404 // check that there are no duplicate case labels or default clauses.
1405 Set<Object> labels = new HashSet<>(); // The set of case labels.
1406 boolean hasDefault = false; // Is there a default label?
1407 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1408 JCCase c = l.head;
1409 if (c.pat != null) {
1410 if (enumSwitch) {
1411 Symbol sym = enumConstant(c.pat, seltype);
1412 if (sym == null) {
1413 log.error(c.pat.pos(), Errors.EnumLabelMustBeUnqualifiedEnum);
1414 } else if (!labels.add(sym)) {
1415 log.error(c.pos(), Errors.DuplicateCaseLabel);
1416 }
1417 } else {
1418 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1419 if (!pattype.hasTag(ERROR)) {
1420 if (pattype.constValue() == null) {
1421 log.error(c.pat.pos(),
1422 (stringSwitch ? Errors.StringConstReq : Errors.ConstExprReq));
1423 } else if (!labels.add(pattype.constValue())) {
1424 log.error(c.pos(), Errors.DuplicateCaseLabel);
1425 }
1426 }
1427 }
1428 } else if (hasDefault) {
1429 log.error(c.pos(), Errors.DuplicateDefaultLabel);
1430 } else {
1431 hasDefault = true;
1432 }
1433 Env<AttrContext> caseEnv =
1434 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1435 try {
1436 attribStats(c.stats, caseEnv);
1437 } finally {
1438 caseEnv.info.scope.leave();
1439 addVars(c.stats, switchEnv.info.scope);
1440 }
1441 }
1442
1443 result = null;
1444 }
1445 finally {
1446 switchEnv.info.scope.leave();
1447 }
1448 }
1449 // where
1450 /** Add any variables defined in stats to the switch scope. */
1451 private static void addVars(List<JCStatement> stats, WriteableScope switchScope) {
1452 for (;stats.nonEmpty(); stats = stats.tail) {
1453 JCTree stat = stats.head;
1454 if (stat.hasTag(VARDEF))
1455 switchScope.enter(((JCVariableDecl) stat).sym);
1456 }
1457 }
1458 // where
1459 /** Return the selected enumeration constant symbol, or null. */
1460 private Symbol enumConstant(JCTree tree, Type enumType) {
1461 if (tree.hasTag(IDENT)) {
1462 JCIdent ident = (JCIdent)tree;
1463 Name name = ident.name;
1464 for (Symbol sym : enumType.tsym.members().getSymbolsByName(name)) {
1465 if (sym.kind == VAR) {
1466 Symbol s = ident.sym = sym;
1467 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1468 ident.type = s.type;
1469 return ((s.flags_field & Flags.ENUM) == 0)
1470 ? null : s;
1471 }
1472 }
1473 }
1474 return null;
1475 }
1476
1477 public void visitSynchronized(JCSynchronized tree) {
1478 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1479 attribStat(tree.body, env);
1480 result = null;
1481 }
1482
1483 public void visitTry(JCTry tree) {
1484 // Create a new local environment with a local
1485 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1486 try {
1487 boolean isTryWithResource = tree.resources.nonEmpty();
1488 // Create a nested environment for attributing the try block if needed
1489 Env<AttrContext> tryEnv = isTryWithResource ?
1490 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1491 localEnv;
1492 try {
1493 // Attribute resource declarations
1494 for (JCTree resource : tree.resources) {
1495 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1496 @Override
1497 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1498 chk.basicHandler.report(pos, diags.fragment(Fragments.TryNotApplicableToType(details)));
1499 }
1500 };
1501 ResultInfo twrResult =
1502 new ResultInfo(KindSelector.VAR,
1503 syms.autoCloseableType,
1504 twrContext);
1505 if (resource.hasTag(VARDEF)) {
1506 attribStat(resource, tryEnv);
1507 twrResult.check(resource, resource.type);
1508
1509 //check that resource type cannot throw InterruptedException
1510 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1511
1512 VarSymbol var = ((JCVariableDecl) resource).sym;
1513 var.setData(ElementKind.RESOURCE_VARIABLE);
1514 } else {
1515 attribTree(resource, tryEnv, twrResult);
1516 }
1517 }
1518 // Attribute body
1519 attribStat(tree.body, tryEnv);
1520 } finally {
1521 if (isTryWithResource)
1522 tryEnv.info.scope.leave();
1523 }
1524
1525 // Attribute catch clauses
1526 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1527 JCCatch c = l.head;
1528 Env<AttrContext> catchEnv =
1529 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1530 try {
1531 Type ctype = attribStat(c.param, catchEnv);
1532 if (TreeInfo.isMultiCatch(c)) {
1533 //multi-catch parameter is implicitly marked as final
1534 c.param.sym.flags_field |= FINAL | UNION;
1535 }
1536 if (c.param.sym.kind == VAR) {
1537 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1538 }
1539 chk.checkType(c.param.vartype.pos(),
1540 chk.checkClassType(c.param.vartype.pos(), ctype),
1541 syms.throwableType);
1542 attribStat(c.body, catchEnv);
1543 } finally {
1544 catchEnv.info.scope.leave();
1545 }
1546 }
1547
1548 // Attribute finalizer
1549 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1550 result = null;
1551 }
1552 finally {
1553 localEnv.info.scope.leave();
1554 }
1555 }
1556
1557 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1558 if (!resource.isErroneous() &&
1559 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1560 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1561 Symbol close = syms.noSymbol;
1562 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1563 try {
1564 close = rs.resolveQualifiedMethod(pos,
1565 env,
1566 types.skipTypeVars(resource, false),
1567 names.close,
1568 List.nil(),
1569 List.nil());
1570 }
1571 finally {
1572 log.popDiagnosticHandler(discardHandler);
1573 }
1574 if (close.kind == MTH &&
1575 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1576 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1577 env.info.lint.isEnabled(LintCategory.TRY)) {
1578 log.warning(LintCategory.TRY, pos, Warnings.TryResourceThrowsInterruptedExc(resource));
1579 }
1580 }
1581 }
1582
1583 public void visitConditional(JCConditional tree) {
1584 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1585
1586 tree.polyKind = (!allowPoly ||
1587 pt().hasTag(NONE) && pt() != Type.recoveryType && pt() != Infer.anyPoly ||
1588 isBooleanOrNumeric(env, tree)) ?
1589 PolyKind.STANDALONE : PolyKind.POLY;
1590
1591 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1592 //this means we are returning a poly conditional from void-compatible lambda expression
1593 resultInfo.checkContext.report(tree, diags.fragment(Fragments.ConditionalTargetCantBeVoid));
1594 result = tree.type = types.createErrorType(resultInfo.pt);
1595 return;
1596 }
1597
1598 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1599 unknownExprInfo :
1600 resultInfo.dup(conditionalContext(resultInfo.checkContext));
1601
1602 Type truetype = attribTree(tree.truepart, env, condInfo);
1603 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1604
1605 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1606 if (condtype.constValue() != null &&
1607 truetype.constValue() != null &&
1608 falsetype.constValue() != null &&
1609 !owntype.hasTag(NONE)) {
1610 //constant folding
1611 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1612 }
1613 result = check(tree, owntype, KindSelector.VAL, resultInfo);
1614 }
1615 //where
1616 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1617 switch (tree.getTag()) {
1618 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1619 ((JCLiteral)tree).typetag == BOOLEAN ||
1620 ((JCLiteral)tree).typetag == BOT;
1621 case LAMBDA: case REFERENCE: return false;
1622 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1623 case CONDEXPR:
1624 JCConditional condTree = (JCConditional)tree;
1625 return isBooleanOrNumeric(env, condTree.truepart) &&
1626 isBooleanOrNumeric(env, condTree.falsepart);
1627 case APPLY:
1628 JCMethodInvocation speculativeMethodTree =
1629 (JCMethodInvocation)deferredAttr.attribSpeculative(
1630 tree, env, unknownExprInfo,
1631 argumentAttr.withLocalCacheContext());
1632 Symbol msym = TreeInfo.symbol(speculativeMethodTree.meth);
1633 Type receiverType = speculativeMethodTree.meth.hasTag(IDENT) ?
1634 env.enclClass.type :
1635 ((JCFieldAccess)speculativeMethodTree.meth).selected.type;
1636 Type owntype = types.memberType(receiverType, msym).getReturnType();
1637 return primitiveOrBoxed(owntype);
1638 case NEWCLASS:
1639 JCExpression className =
1640 removeClassParams.translate(((JCNewClass)tree).clazz);
1641 JCExpression speculativeNewClassTree =
1642 (JCExpression)deferredAttr.attribSpeculative(
1643 className, env, unknownTypeInfo,
1644 argumentAttr.withLocalCacheContext());
1645 return primitiveOrBoxed(speculativeNewClassTree.type);
1646 default:
1647 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo,
1648 argumentAttr.withLocalCacheContext()).type;
1649 return primitiveOrBoxed(speculativeType);
1650 }
1651 }
1652 //where
1653 boolean primitiveOrBoxed(Type t) {
1654 return (!t.hasTag(TYPEVAR) && types.unboxedTypeOrType(t).isPrimitive());
1655 }
1656
1657 TreeTranslator removeClassParams = new TreeTranslator() {
1658 @Override
1659 public void visitTypeApply(JCTypeApply tree) {
1660 result = translate(tree.clazz);
1661 }
1662 };
1663
1664 CheckContext conditionalContext(CheckContext checkContext) {
1665 return new Check.NestedCheckContext(checkContext) {
1666 //this will use enclosing check context to check compatibility of
1667 //subexpression against target type; if we are in a method check context,
1668 //depending on whether boxing is allowed, we could have incompatibilities
1669 @Override
1670 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1671 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleTypeInConditional(details)));
1672 }
1673 };
1674 }
1675
1676 /** Compute the type of a conditional expression, after
1677 * checking that it exists. See JLS 15.25. Does not take into
1678 * account the special case where condition and both arms
1679 * are constants.
1680 *
1681 * @param pos The source position to be used for error
1682 * diagnostics.
1683 * @param thentype The type of the expression's then-part.
1684 * @param elsetype The type of the expression's else-part.
1685 */
1686 Type condType(DiagnosticPosition pos,
1687 Type thentype, Type elsetype) {
1688 // If same type, that is the result
1689 if (types.isSameType(thentype, elsetype))
1690 return thentype.baseType();
1691
1692 Type thenUnboxed = (thentype.isPrimitive())
1693 ? thentype : types.unboxedType(thentype);
1694 Type elseUnboxed = (elsetype.isPrimitive())
1695 ? elsetype : types.unboxedType(elsetype);
1696
1697 // Otherwise, if both arms can be converted to a numeric
1698 // type, return the least numeric type that fits both arms
1699 // (i.e. return larger of the two, or return int if one
1700 // arm is short, the other is char).
1701 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1702 // If one arm has an integer subrange type (i.e., byte,
1703 // short, or char), and the other is an integer constant
1704 // that fits into the subrange, return the subrange type.
1705 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1706 elseUnboxed.hasTag(INT) &&
1707 types.isAssignable(elseUnboxed, thenUnboxed)) {
1708 return thenUnboxed.baseType();
1709 }
1710 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1711 thenUnboxed.hasTag(INT) &&
1712 types.isAssignable(thenUnboxed, elseUnboxed)) {
1713 return elseUnboxed.baseType();
1714 }
1715
1716 for (TypeTag tag : primitiveTags) {
1717 Type candidate = syms.typeOfTag[tag.ordinal()];
1718 if (types.isSubtype(thenUnboxed, candidate) &&
1719 types.isSubtype(elseUnboxed, candidate)) {
1720 return candidate;
1721 }
1722 }
1723 }
1724
1725 // Those were all the cases that could result in a primitive
1726 if (thentype.isPrimitive())
1727 thentype = types.boxedClass(thentype).type;
1728 if (elsetype.isPrimitive())
1729 elsetype = types.boxedClass(elsetype).type;
1730
1731 if (types.isSubtype(thentype, elsetype))
1732 return elsetype.baseType();
1733 if (types.isSubtype(elsetype, thentype))
1734 return thentype.baseType();
1735
1736 if (thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1737 log.error(pos,
1738 Errors.NeitherConditionalSubtype(thentype,
1739 elsetype));
1740 return thentype.baseType();
1741 }
1742
1743 // both are known to be reference types. The result is
1744 // lub(thentype,elsetype). This cannot fail, as it will
1745 // always be possible to infer "Object" if nothing better.
1746 return types.lub(thentype.baseType(), elsetype.baseType());
1747 }
1748
1749 final static TypeTag[] primitiveTags = new TypeTag[]{
1750 BYTE,
1751 CHAR,
1752 SHORT,
1753 INT,
1754 LONG,
1755 FLOAT,
1756 DOUBLE,
1757 BOOLEAN,
1758 };
1759
1760 public void visitIf(JCIf tree) {
1761 attribExpr(tree.cond, env, syms.booleanType);
1762 attribStat(tree.thenpart, env);
1763 if (tree.elsepart != null)
1764 attribStat(tree.elsepart, env);
1765 chk.checkEmptyIf(tree);
1766 result = null;
1767 }
1768
1769 public void visitExec(JCExpressionStatement tree) {
1770 //a fresh environment is required for 292 inference to work properly ---
1771 //see Infer.instantiatePolymorphicSignatureInstance()
1772 Env<AttrContext> localEnv = env.dup(tree);
1773 attribExpr(tree.expr, localEnv);
1774 result = null;
1775 }
1776
1777 public void visitBreak(JCBreak tree) {
1778 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1779 result = null;
1780 }
1781
1782 public void visitContinue(JCContinue tree) {
1783 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1784 result = null;
1785 }
1786 //where
1787 /** Return the target of a break or continue statement, if it exists,
1788 * report an error if not.
1789 * Note: The target of a labelled break or continue is the
1790 * (non-labelled) statement tree referred to by the label,
1791 * not the tree representing the labelled statement itself.
1792 *
1793 * @param pos The position to be used for error diagnostics
1794 * @param tag The tag of the jump statement. This is either
1795 * Tree.BREAK or Tree.CONTINUE.
1796 * @param label The label of the jump statement, or null if no
1797 * label is given.
1798 * @param env The environment current at the jump statement.
1799 */
1800 private JCTree findJumpTarget(DiagnosticPosition pos,
1801 JCTree.Tag tag,
1802 Name label,
1803 Env<AttrContext> env) {
1804 // Search environments outwards from the point of jump.
1805 Env<AttrContext> env1 = env;
1806 LOOP:
1807 while (env1 != null) {
1808 switch (env1.tree.getTag()) {
1809 case LABELLED:
1810 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1811 if (label == labelled.label) {
1812 // If jump is a continue, check that target is a loop.
1813 if (tag == CONTINUE) {
1814 if (!labelled.body.hasTag(DOLOOP) &&
1815 !labelled.body.hasTag(WHILELOOP) &&
1816 !labelled.body.hasTag(FORLOOP) &&
1817 !labelled.body.hasTag(FOREACHLOOP))
1818 log.error(pos, Errors.NotLoopLabel(label));
1819 // Found labelled statement target, now go inwards
1820 // to next non-labelled tree.
1821 return TreeInfo.referencedStatement(labelled);
1822 } else {
1823 return labelled;
1824 }
1825 }
1826 break;
1827 case DOLOOP:
1828 case WHILELOOP:
1829 case FORLOOP:
1830 case FOREACHLOOP:
1831 if (label == null) return env1.tree;
1832 break;
1833 case SWITCH:
1834 if (label == null && tag == BREAK) return env1.tree;
1835 break;
1836 case LAMBDA:
1837 case METHODDEF:
1838 case CLASSDEF:
1839 break LOOP;
1840 default:
1841 }
1842 env1 = env1.next;
1843 }
1844 if (label != null)
1845 log.error(pos, Errors.UndefLabel(label));
1846 else if (tag == CONTINUE)
1847 log.error(pos, Errors.ContOutsideLoop);
1848 else
1849 log.error(pos, Errors.BreakOutsideSwitchLoop);
1850 return null;
1851 }
1852
1853 public void visitReturn(JCReturn tree) {
1854 // Check that there is an enclosing method which is
1855 // nested within than the enclosing class.
1856 if (env.info.returnResult == null) {
1857 log.error(tree.pos(), Errors.RetOutsideMeth);
1858 } else {
1859 // Attribute return expression, if it exists, and check that
1860 // it conforms to result type of enclosing method.
1861 if (tree.expr != null) {
1862 if (env.info.returnResult.pt.hasTag(VOID)) {
1863 env.info.returnResult.checkContext.report(tree.expr.pos(),
1864 diags.fragment(Fragments.UnexpectedRetVal));
1865 }
1866 attribTree(tree.expr, env, env.info.returnResult);
1867 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1868 !env.info.returnResult.pt.hasTag(NONE)) {
1869 env.info.returnResult.checkContext.report(tree.pos(),
1870 diags.fragment(Fragments.MissingRetVal(env.info.returnResult.pt)));
1871 }
1872 }
1873 result = null;
1874 }
1875
1876 public void visitThrow(JCThrow tree) {
1877 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1878 if (allowPoly) {
1879 chk.checkType(tree, owntype, syms.throwableType);
1880 }
1881 result = null;
1882 }
1883
1884 public void visitAssert(JCAssert tree) {
1885 attribExpr(tree.cond, env, syms.booleanType);
1886 if (tree.detail != null) {
1887 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1888 }
1889 result = null;
1890 }
1891
1892 /** Visitor method for method invocations.
1893 * NOTE: The method part of an application will have in its type field
1894 * the return type of the method, not the method's type itself!
1895 */
1896 public void visitApply(JCMethodInvocation tree) {
1897 // The local environment of a method application is
1898 // a new environment nested in the current one.
1899 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1900
1901 // The types of the actual method arguments.
1902 List<Type> argtypes;
1903
1904 // The types of the actual method type arguments.
1905 List<Type> typeargtypes = null;
1906
1907 Name methName = TreeInfo.name(tree.meth);
1908
1909 boolean isConstructorCall =
1910 methName == names._this || methName == names._super;
1911
1912 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1913 if (isConstructorCall) {
1914 // We are seeing a ...this(...) or ...super(...) call.
1915 // Check that this is the first statement in a constructor.
1916 if (checkFirstConstructorStat(tree, env)) {
1917
1918 // Record the fact
1919 // that this is a constructor call (using isSelfCall).
1920 localEnv.info.isSelfCall = true;
1921
1922 // Attribute arguments, yielding list of argument types.
1923 KindSelector kind = attribArgs(KindSelector.MTH, tree.args, localEnv, argtypesBuf);
1924 argtypes = argtypesBuf.toList();
1925 typeargtypes = attribTypes(tree.typeargs, localEnv);
1926
1927 // Variable `site' points to the class in which the called
1928 // constructor is defined.
1929 Type site = env.enclClass.sym.type;
1930 if (methName == names._super) {
1931 if (site == syms.objectType) {
1932 log.error(tree.meth.pos(), Errors.NoSuperclass(site));
1933 site = types.createErrorType(syms.objectType);
1934 } else {
1935 site = types.supertype(site);
1936 }
1937 }
1938
1939 if (site.hasTag(CLASS)) {
1940 Type encl = site.getEnclosingType();
1941 while (encl != null && encl.hasTag(TYPEVAR))
1942 encl = encl.getUpperBound();
1943 if (encl.hasTag(CLASS)) {
1944 // we are calling a nested class
1945
1946 if (tree.meth.hasTag(SELECT)) {
1947 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1948
1949 // We are seeing a prefixed call, of the form
1950 // <expr>.super(...).
1951 // Check that the prefix expression conforms
1952 // to the outer instance type of the class.
1953 chk.checkRefType(qualifier.pos(),
1954 attribExpr(qualifier, localEnv,
1955 encl));
1956 } else if (methName == names._super) {
1957 // qualifier omitted; check for existence
1958 // of an appropriate implicit qualifier.
1959 rs.resolveImplicitThis(tree.meth.pos(),
1960 localEnv, site, true);
1961 }
1962 } else if (tree.meth.hasTag(SELECT)) {
1963 log.error(tree.meth.pos(),
1964 Errors.IllegalQualNotIcls(site.tsym));
1965 }
1966
1967 // if we're calling a java.lang.Enum constructor,
1968 // prefix the implicit String and int parameters
1969 if (site.tsym == syms.enumSym)
1970 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1971
1972 // Resolve the called constructor under the assumption
1973 // that we are referring to a superclass instance of the
1974 // current instance (JLS ???).
1975 boolean selectSuperPrev = localEnv.info.selectSuper;
1976 localEnv.info.selectSuper = true;
1977 localEnv.info.pendingResolutionPhase = null;
1978 Symbol sym = rs.resolveConstructor(
1979 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1980 localEnv.info.selectSuper = selectSuperPrev;
1981
1982 // Set method symbol to resolved constructor...
1983 TreeInfo.setSymbol(tree.meth, sym);
1984
1985 // ...and check that it is legal in the current context.
1986 // (this will also set the tree's type)
1987 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1988 checkId(tree.meth, site, sym, localEnv,
1989 new ResultInfo(kind, mpt));
1990 }
1991 // Otherwise, `site' is an error type and we do nothing
1992 }
1993 result = tree.type = syms.voidType;
1994 } else {
1995 // Otherwise, we are seeing a regular method call.
1996 // Attribute the arguments, yielding list of argument types, ...
1997 KindSelector kind = attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
1998 argtypes = argtypesBuf.toList();
1999 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
2000
2001 // ... and attribute the method using as a prototype a methodtype
2002 // whose formal argument types is exactly the list of actual
2003 // arguments (this will also set the method symbol).
2004 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
2005 localEnv.info.pendingResolutionPhase = null;
2006 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
2007
2008 // Compute the result type.
2009 Type restype = mtype.getReturnType();
2010 if (restype.hasTag(WILDCARD))
2011 throw new AssertionError(mtype);
2012
2013 Type qualifier = (tree.meth.hasTag(SELECT))
2014 ? ((JCFieldAccess) tree.meth).selected.type
2015 : env.enclClass.sym.type;
2016 Symbol msym = TreeInfo.symbol(tree.meth);
2017 restype = adjustMethodReturnType(msym, qualifier, methName, argtypes, restype);
2018
2019 chk.checkRefTypes(tree.typeargs, typeargtypes);
2020
2021 // Check that value of resulting type is admissible in the
2022 // current context. Also, capture the return type
2023 Type capturedRes = resultInfo.checkContext.inferenceContext().cachedCapture(tree, restype, true);
2024 result = check(tree, capturedRes, KindSelector.VAL, resultInfo);
2025 }
2026 chk.validate(tree.typeargs, localEnv);
2027 }
2028 //where
2029 Type adjustMethodReturnType(Symbol msym, Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
2030 if (msym != null &&
2031 msym.owner == syms.objectType.tsym &&
2032 methodName == names.getClass &&
2033 argtypes.isEmpty()) {
2034 // as a special case, x.getClass() has type Class<? extends |X|>
2035 return new ClassType(restype.getEnclosingType(),
2036 List.of(new WildcardType(types.erasure(qualifierType),
2037 BoundKind.EXTENDS,
2038 syms.boundClass)),
2039 restype.tsym,
2040 restype.getMetadata());
2041 } else if (msym != null &&
2042 msym.owner == syms.arrayClass &&
2043 methodName == names.clone &&
2044 types.isArray(qualifierType)) {
2045 // as a special case, array.clone() has a result that is
2046 // the same as static type of the array being cloned
2047 return qualifierType;
2048 } else {
2049 return restype;
2050 }
2051 }
2052
2053 /** Check that given application node appears as first statement
2054 * in a constructor call.
2055 * @param tree The application node
2056 * @param env The environment current at the application.
2057 */
2058 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
2059 JCMethodDecl enclMethod = env.enclMethod;
2060 if (enclMethod != null && enclMethod.name == names.init) {
2061 JCBlock body = enclMethod.body;
2062 if (body.stats.head.hasTag(EXEC) &&
2063 ((JCExpressionStatement) body.stats.head).expr == tree)
2064 return true;
2065 }
2066 log.error(tree.pos(),
2067 Errors.CallMustBeFirstStmtInCtor(TreeInfo.name(tree.meth)));
2068 return false;
2069 }
2070
2071 /** Obtain a method type with given argument types.
2072 */
2073 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
2074 MethodType mt = new MethodType(argtypes, restype, List.nil(), syms.methodClass);
2075 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
2076 }
2077
2078 public void visitNewClass(final JCNewClass tree) {
2079 Type owntype = types.createErrorType(tree.type);
2080
2081 // The local environment of a class creation is
2082 // a new environment nested in the current one.
2083 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
2084
2085 // The anonymous inner class definition of the new expression,
2086 // if one is defined by it.
2087 JCClassDecl cdef = tree.def;
2088
2089 // If enclosing class is given, attribute it, and
2090 // complete class name to be fully qualified
2091 JCExpression clazz = tree.clazz; // Class field following new
2092 JCExpression clazzid; // Identifier in class field
2093 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
2094 annoclazzid = null;
2095
2096 if (clazz.hasTag(TYPEAPPLY)) {
2097 clazzid = ((JCTypeApply) clazz).clazz;
2098 if (clazzid.hasTag(ANNOTATED_TYPE)) {
2099 annoclazzid = (JCAnnotatedType) clazzid;
2100 clazzid = annoclazzid.underlyingType;
2101 }
2102 } else {
2103 if (clazz.hasTag(ANNOTATED_TYPE)) {
2104 annoclazzid = (JCAnnotatedType) clazz;
2105 clazzid = annoclazzid.underlyingType;
2106 } else {
2107 clazzid = clazz;
2108 }
2109 }
2110
2111 JCExpression clazzid1 = clazzid; // The same in fully qualified form
2112
2113 if (tree.encl != null) {
2114 // We are seeing a qualified new, of the form
2115 // <expr>.new C <...> (...) ...
2116 // In this case, we let clazz stand for the name of the
2117 // allocated class C prefixed with the type of the qualifier
2118 // expression, so that we can
2119 // resolve it with standard techniques later. I.e., if
2120 // <expr> has type T, then <expr>.new C <...> (...)
2121 // yields a clazz T.C.
2122 Type encltype = chk.checkRefType(tree.encl.pos(),
2123 attribExpr(tree.encl, env));
2124 // TODO 308: in <expr>.new C, do we also want to add the type annotations
2125 // from expr to the combined type, or not? Yes, do this.
2126 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
2127 ((JCIdent) clazzid).name);
2128
2129 EndPosTable endPosTable = this.env.toplevel.endPositions;
2130 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
2131 if (clazz.hasTag(ANNOTATED_TYPE)) {
2132 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
2133 List<JCAnnotation> annos = annoType.annotations;
2134
2135 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
2136 clazzid1 = make.at(tree.pos).
2137 TypeApply(clazzid1,
2138 ((JCTypeApply) clazz).arguments);
2139 }
2140
2141 clazzid1 = make.at(tree.pos).
2142 AnnotatedType(annos, clazzid1);
2143 } else if (clazz.hasTag(TYPEAPPLY)) {
2144 clazzid1 = make.at(tree.pos).
2145 TypeApply(clazzid1,
2146 ((JCTypeApply) clazz).arguments);
2147 }
2148
2149 clazz = clazzid1;
2150 }
2151
2152 // Attribute clazz expression and store
2153 // symbol + type back into the attributed tree.
2154 Type clazztype;
2155
2156 try {
2157 env.info.isNewClass = true;
2158 clazztype = TreeInfo.isEnumInit(env.tree) ?
2159 attribIdentAsEnumType(env, (JCIdent)clazz) :
2160 attribType(clazz, env);
2161 } finally {
2162 env.info.isNewClass = false;
2163 }
2164
2165 clazztype = chk.checkDiamond(tree, clazztype);
2166 chk.validate(clazz, localEnv);
2167 if (tree.encl != null) {
2168 // We have to work in this case to store
2169 // symbol + type back into the attributed tree.
2170 tree.clazz.type = clazztype;
2171 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
2172 clazzid.type = ((JCIdent) clazzid).sym.type;
2173 if (annoclazzid != null) {
2174 annoclazzid.type = clazzid.type;
2175 }
2176 if (!clazztype.isErroneous()) {
2177 if (cdef != null && clazztype.tsym.isInterface()) {
2178 log.error(tree.encl.pos(), Errors.AnonClassImplIntfNoQualForNew);
2179 } else if (clazztype.tsym.isStatic()) {
2180 log.error(tree.encl.pos(), Errors.QualifiedNewOfStaticClass(clazztype.tsym));
2181 }
2182 }
2183 } else if (!clazztype.tsym.isInterface() &&
2184 clazztype.getEnclosingType().hasTag(CLASS)) {
2185 // Check for the existence of an apropos outer instance
2186 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2187 }
2188
2189 // Attribute constructor arguments.
2190 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2191 final KindSelector pkind =
2192 attribArgs(KindSelector.VAL, tree.args, localEnv, argtypesBuf);
2193 List<Type> argtypes = argtypesBuf.toList();
2194 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2195
2196 if (clazztype.hasTag(CLASS) || clazztype.hasTag(ERROR)) {
2197 // Enums may not be instantiated except implicitly
2198 if ((clazztype.tsym.flags_field & Flags.ENUM) != 0 &&
2199 (!env.tree.hasTag(VARDEF) ||
2200 (((JCVariableDecl) env.tree).mods.flags & Flags.ENUM) == 0 ||
2201 ((JCVariableDecl) env.tree).init != tree))
2202 log.error(tree.pos(), Errors.EnumCantBeInstantiated);
2203
2204 boolean isSpeculativeDiamondInferenceRound = TreeInfo.isDiamond(tree) &&
2205 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2206 boolean skipNonDiamondPath = false;
2207 // Check that class is not abstract
2208 if (cdef == null && !isSpeculativeDiamondInferenceRound && // class body may be nulled out in speculative tree copy
2209 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2210 log.error(tree.pos(),
2211 Errors.AbstractCantBeInstantiated(clazztype.tsym));
2212 skipNonDiamondPath = true;
2213 } else if (cdef != null && clazztype.tsym.isInterface()) {
2214 // Check that no constructor arguments are given to
2215 // anonymous classes implementing an interface
2216 if (!argtypes.isEmpty())
2217 log.error(tree.args.head.pos(), Errors.AnonClassImplIntfNoArgs);
2218
2219 if (!typeargtypes.isEmpty())
2220 log.error(tree.typeargs.head.pos(), Errors.AnonClassImplIntfNoTypeargs);
2221
2222 // Error recovery: pretend no arguments were supplied.
2223 argtypes = List.nil();
2224 typeargtypes = List.nil();
2225 skipNonDiamondPath = true;
2226 }
2227 if (TreeInfo.isDiamond(tree)) {
2228 ClassType site = new ClassType(clazztype.getEnclosingType(),
2229 clazztype.tsym.type.getTypeArguments(),
2230 clazztype.tsym,
2231 clazztype.getMetadata());
2232
2233 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2234 diamondEnv.info.selectSuper = cdef != null;
2235 diamondEnv.info.pendingResolutionPhase = null;
2236
2237 //if the type of the instance creation expression is a class type
2238 //apply method resolution inference (JLS 15.12.2.7). The return type
2239 //of the resolved constructor will be a partially instantiated type
2240 Symbol constructor = rs.resolveDiamond(tree.pos(),
2241 diamondEnv,
2242 site,
2243 argtypes,
2244 typeargtypes);
2245 tree.constructor = constructor.baseSymbol();
2246
2247 final TypeSymbol csym = clazztype.tsym;
2248 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes),
2249 diamondContext(tree, csym, resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
2250 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2251 constructorType = checkId(tree, site,
2252 constructor,
2253 diamondEnv,
2254 diamondResult);
2255
2256 tree.clazz.type = types.createErrorType(clazztype);
2257 if (!constructorType.isErroneous()) {
2258 tree.clazz.type = clazz.type = constructorType.getReturnType();
2259 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2260 }
2261 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2262 }
2263
2264 // Resolve the called constructor under the assumption
2265 // that we are referring to a superclass instance of the
2266 // current instance (JLS ???).
2267 else if (!skipNonDiamondPath) {
2268 //the following code alters some of the fields in the current
2269 //AttrContext - hence, the current context must be dup'ed in
2270 //order to avoid downstream failures
2271 Env<AttrContext> rsEnv = localEnv.dup(tree);
2272 rsEnv.info.selectSuper = cdef != null;
2273 rsEnv.info.pendingResolutionPhase = null;
2274 tree.constructor = rs.resolveConstructor(
2275 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2276 if (cdef == null) { //do not check twice!
2277 tree.constructorType = checkId(tree,
2278 clazztype,
2279 tree.constructor,
2280 rsEnv,
2281 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2282 if (rsEnv.info.lastResolveVarargs())
2283 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2284 }
2285 }
2286
2287 if (cdef != null) {
2288 visitAnonymousClassDefinition(tree, clazz, clazztype, cdef, localEnv, argtypes, typeargtypes, pkind);
2289 return;
2290 }
2291
2292 if (tree.constructor != null && tree.constructor.kind == MTH)
2293 owntype = clazztype;
2294 }
2295 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2296 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2297 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2298 //we need to wait for inference to finish and then replace inference vars in the constructor type
2299 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2300 instantiatedContext -> {
2301 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2302 });
2303 }
2304 chk.validate(tree.typeargs, localEnv);
2305 }
2306
2307 // where
2308 private void visitAnonymousClassDefinition(JCNewClass tree, JCExpression clazz, Type clazztype,
2309 JCClassDecl cdef, Env<AttrContext> localEnv,
2310 List<Type> argtypes, List<Type> typeargtypes,
2311 KindSelector pkind) {
2312 // We are seeing an anonymous class instance creation.
2313 // In this case, the class instance creation
2314 // expression
2315 //
2316 // E.new <typeargs1>C<typargs2>(args) { ... }
2317 //
2318 // is represented internally as
2319 //
2320 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2321 //
2322 // This expression is then *transformed* as follows:
2323 //
2324 // (1) add an extends or implements clause
2325 // (2) add a constructor.
2326 //
2327 // For instance, if C is a class, and ET is the type of E,
2328 // the expression
2329 //
2330 // E.new <typeargs1>C<typargs2>(args) { ... }
2331 //
2332 // is translated to (where X is a fresh name and typarams is the
2333 // parameter list of the super constructor):
2334 //
2335 // new <typeargs1>X(<*nullchk*>E, args) where
2336 // X extends C<typargs2> {
2337 // <typarams> X(ET e, args) {
2338 // e.<typeargs1>super(args)
2339 // }
2340 // ...
2341 // }
2342 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2343 final boolean isDiamond = TreeInfo.isDiamond(tree);
2344 if (isDiamond
2345 && ((tree.constructorType != null && inferenceContext.free(tree.constructorType))
2346 || (tree.clazz.type != null && inferenceContext.free(tree.clazz.type)))) {
2347 final ResultInfo resultInfoForClassDefinition = this.resultInfo;
2348 inferenceContext.addFreeTypeListener(List.of(tree.constructorType, tree.clazz.type),
2349 instantiatedContext -> {
2350 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2351 tree.clazz.type = clazz.type = instantiatedContext.asInstType(clazz.type);
2352 ResultInfo prevResult = this.resultInfo;
2353 try {
2354 this.resultInfo = resultInfoForClassDefinition;
2355 visitAnonymousClassDefinition(tree, clazz, clazz.type, cdef,
2356 localEnv, argtypes, typeargtypes, pkind);
2357 } finally {
2358 this.resultInfo = prevResult;
2359 }
2360 });
2361 } else {
2362 if (isDiamond && clazztype.hasTag(CLASS)) {
2363 List<Type> invalidDiamondArgs = chk.checkDiamondDenotable((ClassType)clazztype);
2364 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
2365 // One or more types inferred in the previous steps is non-denotable.
2366 Fragment fragment = Diamond(clazztype.tsym);
2367 log.error(tree.clazz.pos(),
2368 Errors.CantApplyDiamond1(
2369 fragment,
2370 invalidDiamondArgs.size() > 1 ?
2371 DiamondInvalidArgs(invalidDiamondArgs, fragment) :
2372 DiamondInvalidArg(invalidDiamondArgs, fragment)));
2373 }
2374 // For <>(){}, inferred types must also be accessible.
2375 for (Type t : clazztype.getTypeArguments()) {
2376 rs.checkAccessibleType(env, t);
2377 }
2378 }
2379
2380 // If we already errored, be careful to avoid a further avalanche. ErrorType answers
2381 // false for isInterface call even when the original type is an interface.
2382 boolean implementing = clazztype.tsym.isInterface() ||
2383 clazztype.isErroneous() && !clazztype.getOriginalType().hasTag(NONE) &&
2384 clazztype.getOriginalType().tsym.isInterface();
2385
2386 if (implementing) {
2387 cdef.implementing = List.of(clazz);
2388 } else {
2389 cdef.extending = clazz;
2390 }
2391
2392 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2393 isSerializable(clazztype)) {
2394 localEnv.info.isSerializable = true;
2395 }
2396
2397 attribStat(cdef, localEnv);
2398
2399 List<Type> finalargtypes;
2400 // If an outer instance is given,
2401 // prefix it to the constructor arguments
2402 // and delete it from the new expression
2403 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2404 finalargtypes = argtypes.prepend(tree.encl.type);
2405 } else {
2406 finalargtypes = argtypes;
2407 }
2408
2409 // Reassign clazztype and recompute constructor. As this necessarily involves
2410 // another attribution pass for deferred types in the case of <>, replicate
2411 // them. Original arguments have right decorations already.
2412 if (isDiamond && pkind.contains(KindSelector.POLY)) {
2413 finalargtypes = finalargtypes.map(deferredAttr.deferredCopier);
2414 }
2415
2416 clazztype = clazztype.hasTag(ERROR) ? types.createErrorType(cdef.sym.type)
2417 : cdef.sym.type;
2418 Symbol sym = tree.constructor = rs.resolveConstructor(
2419 tree.pos(), localEnv, clazztype, finalargtypes, typeargtypes);
2420 Assert.check(!sym.kind.isResolutionError());
2421 tree.constructor = sym;
2422 tree.constructorType = checkId(tree,
2423 clazztype,
2424 tree.constructor,
2425 localEnv,
2426 new ResultInfo(pkind, newMethodTemplate(syms.voidType, finalargtypes, typeargtypes), CheckMode.NO_TREE_UPDATE));
2427 }
2428 Type owntype = (tree.constructor != null && tree.constructor.kind == MTH) ?
2429 clazztype : types.createErrorType(tree.type);
2430 result = check(tree, owntype, KindSelector.VAL, resultInfo.dup(CheckMode.NO_INFERENCE_HOOK));
2431 chk.validate(tree.typeargs, localEnv);
2432 }
2433
2434 CheckContext diamondContext(JCNewClass clazz, TypeSymbol tsym, CheckContext checkContext) {
2435 return new Check.NestedCheckContext(checkContext) {
2436 @Override
2437 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2438 enclosingContext.report(clazz.clazz,
2439 diags.fragment(Fragments.CantApplyDiamond1(Fragments.Diamond(tsym), details)));
2440 }
2441 };
2442 }
2443
2444 /** Make an attributed null check tree.
2445 */
2446 public JCExpression makeNullCheck(JCExpression arg) {
2447 // optimization: new Outer() can never be null; skip null check
2448 if (arg.getTag() == NEWCLASS)
2449 return arg;
2450 // optimization: X.this is never null; skip null check
2451 Name name = TreeInfo.name(arg);
2452 if (name == names._this || name == names._super) return arg;
2453
2454 JCTree.Tag optag = NULLCHK;
2455 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2456 tree.operator = operators.resolveUnary(arg, optag, arg.type);
2457 tree.type = arg.type;
2458 return tree;
2459 }
2460
2461 public void visitNewArray(JCNewArray tree) {
2462 Type owntype = types.createErrorType(tree.type);
2463 Env<AttrContext> localEnv = env.dup(tree);
2464 Type elemtype;
2465 if (tree.elemtype != null) {
2466 elemtype = attribType(tree.elemtype, localEnv);
2467 chk.validate(tree.elemtype, localEnv);
2468 owntype = elemtype;
2469 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2470 attribExpr(l.head, localEnv, syms.intType);
2471 owntype = new ArrayType(owntype, syms.arrayClass);
2472 }
2473 } else {
2474 // we are seeing an untyped aggregate { ... }
2475 // this is allowed only if the prototype is an array
2476 if (pt().hasTag(ARRAY)) {
2477 elemtype = types.elemtype(pt());
2478 } else {
2479 if (!pt().hasTag(ERROR) &&
2480 (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2481 log.error(tree.pos(),
2482 Errors.IllegalInitializerForType(pt()));
2483 }
2484 elemtype = types.createErrorType(pt());
2485 }
2486 }
2487 if (tree.elems != null) {
2488 attribExprs(tree.elems, localEnv, elemtype);
2489 owntype = new ArrayType(elemtype, syms.arrayClass);
2490 }
2491 if (!types.isReifiable(elemtype))
2492 log.error(tree.pos(), Errors.GenericArrayCreation);
2493 result = check(tree, owntype, KindSelector.VAL, resultInfo);
2494 }
2495
2496 /*
2497 * A lambda expression can only be attributed when a target-type is available.
2498 * In addition, if the target-type is that of a functional interface whose
2499 * descriptor contains inference variables in argument position the lambda expression
2500 * is 'stuck' (see DeferredAttr).
2501 */
2502 @Override
2503 public void visitLambda(final JCLambda that) {
2504 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2505 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2506 //lambda only allowed in assignment or method invocation/cast context
2507 log.error(that.pos(), Errors.UnexpectedLambda);
2508 }
2509 result = that.type = types.createErrorType(pt());
2510 return;
2511 }
2512 //create an environment for attribution of the lambda expression
2513 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2514 boolean needsRecovery =
2515 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2516 try {
2517 if (needsRecovery && isSerializable(pt())) {
2518 localEnv.info.isSerializable = true;
2519 localEnv.info.isLambda = true;
2520 }
2521 List<Type> explicitParamTypes = null;
2522 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2523 //attribute lambda parameters
2524 attribStats(that.params, localEnv);
2525 explicitParamTypes = TreeInfo.types(that.params);
2526 }
2527
2528 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
2529 Type currentTarget = targetInfo.target;
2530 Type lambdaType = targetInfo.descriptor;
2531
2532 if (currentTarget.isErroneous()) {
2533 result = that.type = currentTarget;
2534 return;
2535 }
2536
2537 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2538
2539 if (lambdaType.hasTag(FORALL)) {
2540 //lambda expression target desc cannot be a generic method
2541 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
2542 kindName(currentTarget.tsym),
2543 currentTarget.tsym);
2544 resultInfo.checkContext.report(that, diags.fragment(msg));
2545 result = that.type = types.createErrorType(pt());
2546 return;
2547 }
2548
2549 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2550 //add param type info in the AST
2551 List<Type> actuals = lambdaType.getParameterTypes();
2552 List<JCVariableDecl> params = that.params;
2553
2554 boolean arityMismatch = false;
2555
2556 while (params.nonEmpty()) {
2557 if (actuals.isEmpty()) {
2558 //not enough actuals to perform lambda parameter inference
2559 arityMismatch = true;
2560 }
2561 //reset previously set info
2562 Type argType = arityMismatch ?
2563 syms.errType :
2564 actuals.head;
2565 setSyntheticVariableType(params.head, argType);
2566 params.head.sym = null;
2567 actuals = actuals.isEmpty() ?
2568 actuals :
2569 actuals.tail;
2570 params = params.tail;
2571 }
2572
2573 //attribute lambda parameters
2574 attribStats(that.params, localEnv);
2575
2576 if (arityMismatch) {
2577 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
2578 result = that.type = types.createErrorType(currentTarget);
2579 return;
2580 }
2581 }
2582
2583 //from this point on, no recovery is needed; if we are in assignment context
2584 //we will be able to attribute the whole lambda body, regardless of errors;
2585 //if we are in a 'check' method context, and the lambda is not compatible
2586 //with the target-type, it will be recovered anyway in Attr.checkId
2587 needsRecovery = false;
2588
2589 ResultInfo bodyResultInfo = localEnv.info.returnResult =
2590 lambdaBodyResult(that, lambdaType, resultInfo);
2591
2592 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2593 attribTree(that.getBody(), localEnv, bodyResultInfo);
2594 } else {
2595 JCBlock body = (JCBlock)that.body;
2596 attribStats(body.stats, localEnv);
2597 }
2598
2599 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
2600
2601 boolean isSpeculativeRound =
2602 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2603
2604 preFlow(that);
2605 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2606
2607 that.type = currentTarget; //avoids recovery at this stage
2608 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2609
2610 if (!isSpeculativeRound) {
2611 //add thrown types as bounds to the thrown types free variables if needed:
2612 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2613 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2614 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
2615 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
2616 }
2617 }
2618
2619 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2620 }
2621 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
2622 } catch (Types.FunctionDescriptorLookupError ex) {
2623 JCDiagnostic cause = ex.getDiagnostic();
2624 resultInfo.checkContext.report(that, cause);
2625 result = that.type = types.createErrorType(pt());
2626 return;
2627 } catch (Throwable t) {
2628 //when an unexpected exception happens, avoid attempts to attribute the same tree again
2629 //as that would likely cause the same exception again.
2630 needsRecovery = false;
2631 throw t;
2632 } finally {
2633 localEnv.info.scope.leave();
2634 if (needsRecovery) {
2635 attribTree(that, env, recoveryInfo);
2636 }
2637 }
2638 }
2639 //where
2640 class TargetInfo {
2641 Type target;
2642 Type descriptor;
2643
2644 public TargetInfo(Type target, Type descriptor) {
2645 this.target = target;
2646 this.descriptor = descriptor;
2647 }
2648 }
2649
2650 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
2651 Type lambdaType;
2652 Type currentTarget = resultInfo.pt;
2653 if (resultInfo.pt != Type.recoveryType) {
2654 /* We need to adjust the target. If the target is an
2655 * intersection type, for example: SAM & I1 & I2 ...
2656 * the target will be updated to SAM
2657 */
2658 currentTarget = targetChecker.visit(currentTarget, that);
2659 if (explicitParamTypes != null) {
2660 currentTarget = infer.instantiateFunctionalInterface(that,
2661 currentTarget, explicitParamTypes, resultInfo.checkContext);
2662 }
2663 currentTarget = types.removeWildcards(currentTarget);
2664 lambdaType = types.findDescriptorType(currentTarget);
2665 } else {
2666 currentTarget = Type.recoveryType;
2667 lambdaType = fallbackDescriptorType(that);
2668 }
2669 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
2670 //lambda expression target desc cannot be a generic method
2671 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
2672 kindName(currentTarget.tsym),
2673 currentTarget.tsym);
2674 resultInfo.checkContext.report(that, diags.fragment(msg));
2675 currentTarget = types.createErrorType(pt());
2676 }
2677 return new TargetInfo(currentTarget, lambdaType);
2678 }
2679
2680 void preFlow(JCLambda tree) {
2681 new PostAttrAnalyzer() {
2682 @Override
2683 public void scan(JCTree tree) {
2684 if (tree == null ||
2685 (tree.type != null &&
2686 tree.type == Type.stuckType)) {
2687 //don't touch stuck expressions!
2688 return;
2689 }
2690 super.scan(tree);
2691 }
2692 }.scan(tree);
2693 }
2694
2695 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2696
2697 @Override
2698 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2699 return t.isIntersection() ?
2700 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2701 }
2702
2703 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2704 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2705 Type target = null;
2706 for (Type bound : ict.getExplicitComponents()) {
2707 TypeSymbol boundSym = bound.tsym;
2708 if (types.isFunctionalInterface(boundSym) &&
2709 types.findDescriptorSymbol(boundSym) == desc) {
2710 target = bound;
2711 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2712 //bound must be an interface
2713 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2714 }
2715 }
2716 return target != null ?
2717 target :
2718 ict.getExplicitComponents().head; //error recovery
2719 }
2720
2721 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2722 ListBuffer<Type> targs = new ListBuffer<>();
2723 ListBuffer<Type> supertypes = new ListBuffer<>();
2724 for (Type i : ict.interfaces_field) {
2725 if (i.isParameterized()) {
2726 targs.appendList(i.tsym.type.allparams());
2727 }
2728 supertypes.append(i.tsym.type);
2729 }
2730 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
2731 notionalIntf.allparams_field = targs.toList();
2732 notionalIntf.tsym.flags_field |= INTERFACE;
2733 return notionalIntf.tsym;
2734 }
2735
2736 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2737 resultInfo.checkContext.report(pos,
2738 diags.fragment(Fragments.BadIntersectionTargetForFunctionalExpr(diags.fragment(key, args))));
2739 }
2740 };
2741
2742 private Type fallbackDescriptorType(JCExpression tree) {
2743 switch (tree.getTag()) {
2744 case LAMBDA:
2745 JCLambda lambda = (JCLambda)tree;
2746 List<Type> argtypes = List.nil();
2747 for (JCVariableDecl param : lambda.params) {
2748 argtypes = param.vartype != null ?
2749 argtypes.append(param.vartype.type) :
2750 argtypes.append(syms.errType);
2751 }
2752 return new MethodType(argtypes, Type.recoveryType,
2753 List.of(syms.throwableType), syms.methodClass);
2754 case REFERENCE:
2755 return new MethodType(List.nil(), Type.recoveryType,
2756 List.of(syms.throwableType), syms.methodClass);
2757 default:
2758 Assert.error("Cannot get here!");
2759 }
2760 return null;
2761 }
2762
2763 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2764 final InferenceContext inferenceContext, final Type... ts) {
2765 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2766 }
2767
2768 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2769 final InferenceContext inferenceContext, final List<Type> ts) {
2770 if (inferenceContext.free(ts)) {
2771 inferenceContext.addFreeTypeListener(ts,
2772 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
2773 } else {
2774 for (Type t : ts) {
2775 rs.checkAccessibleType(env, t);
2776 }
2777 }
2778 }
2779
2780 /**
2781 * Lambda/method reference have a special check context that ensures
2782 * that i.e. a lambda return type is compatible with the expected
2783 * type according to both the inherited context and the assignment
2784 * context.
2785 */
2786 class FunctionalReturnContext extends Check.NestedCheckContext {
2787
2788 FunctionalReturnContext(CheckContext enclosingContext) {
2789 super(enclosingContext);
2790 }
2791
2792 @Override
2793 public boolean compatible(Type found, Type req, Warner warn) {
2794 //return type must be compatible in both current context and assignment context
2795 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
2796 }
2797
2798 @Override
2799 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2800 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
2801 }
2802 }
2803
2804 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2805
2806 JCExpression expr;
2807 boolean expStmtExpected;
2808
2809 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2810 super(enclosingContext);
2811 this.expr = expr;
2812 }
2813
2814 @Override
2815 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2816 if (expStmtExpected) {
2817 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
2818 } else {
2819 super.report(pos, details);
2820 }
2821 }
2822
2823 @Override
2824 public boolean compatible(Type found, Type req, Warner warn) {
2825 //a void return is compatible with an expression statement lambda
2826 if (req.hasTag(VOID)) {
2827 expStmtExpected = true;
2828 return TreeInfo.isExpressionStatement(expr);
2829 } else {
2830 return super.compatible(found, req, warn);
2831 }
2832 }
2833 }
2834
2835 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
2836 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2837 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2838 new FunctionalReturnContext(resultInfo.checkContext);
2839
2840 return descriptor.getReturnType() == Type.recoveryType ?
2841 recoveryInfo :
2842 new ResultInfo(KindSelector.VAL,
2843 descriptor.getReturnType(), funcContext);
2844 }
2845
2846 /**
2847 * Lambda compatibility. Check that given return types, thrown types, parameter types
2848 * are compatible with the expected functional interface descriptor. This means that:
2849 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2850 * types must be compatible with the return type of the expected descriptor.
2851 */
2852 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2853 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2854
2855 //return values have already been checked - but if lambda has no return
2856 //values, we must ensure that void/value compatibility is correct;
2857 //this amounts at checking that, if a lambda body can complete normally,
2858 //the descriptor's return type must be void
2859 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2860 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2861 Fragment msg =
2862 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
2863 checkContext.report(tree,
2864 diags.fragment(msg));
2865 }
2866
2867 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2868 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2869 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
2870 }
2871 }
2872
2873 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2874 * static field and that lambda has type annotations, these annotations will
2875 * also be stored at these fake clinit methods.
2876 *
2877 * LambdaToMethod also use fake clinit methods so they can be reused.
2878 * Also as LTM is a phase subsequent to attribution, the methods from
2879 * clinits can be safely removed by LTM to save memory.
2880 */
2881 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2882
2883 public MethodSymbol removeClinit(ClassSymbol sym) {
2884 return clinits.remove(sym);
2885 }
2886
2887 /* This method returns an environment to be used to attribute a lambda
2888 * expression.
2889 *
2890 * The owner of this environment is a method symbol. If the current owner
2891 * is not a method, for example if the lambda is used to initialize
2892 * a field, then if the field is:
2893 *
2894 * - an instance field, we use the first constructor.
2895 * - a static field, we create a fake clinit method.
2896 */
2897 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2898 Env<AttrContext> lambdaEnv;
2899 Symbol owner = env.info.scope.owner;
2900 if (owner.kind == VAR && owner.owner.kind == TYP) {
2901 //field initializer
2902 ClassSymbol enclClass = owner.enclClass();
2903 Symbol newScopeOwner = env.info.scope.owner;
2904 /* if the field isn't static, then we can get the first constructor
2905 * and use it as the owner of the environment. This is what
2906 * LTM code is doing to look for type annotations so we are fine.
2907 */
2908 if ((owner.flags() & STATIC) == 0) {
2909 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
2910 newScopeOwner = s;
2911 break;
2912 }
2913 } else {
2914 /* if the field is static then we need to create a fake clinit
2915 * method, this method can later be reused by LTM.
2916 */
2917 MethodSymbol clinit = clinits.get(enclClass);
2918 if (clinit == null) {
2919 Type clinitType = new MethodType(List.nil(),
2920 syms.voidType, List.nil(), syms.methodClass);
2921 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2922 names.clinit, clinitType, enclClass);
2923 clinit.params = List.nil();
2924 clinits.put(enclClass, clinit);
2925 }
2926 newScopeOwner = clinit;
2927 }
2928 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
2929 } else {
2930 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2931 }
2932 return lambdaEnv;
2933 }
2934
2935 @Override
2936 public void visitReference(final JCMemberReference that) {
2937 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2938 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2939 //method reference only allowed in assignment or method invocation/cast context
2940 log.error(that.pos(), Errors.UnexpectedMref);
2941 }
2942 result = that.type = types.createErrorType(pt());
2943 return;
2944 }
2945 final Env<AttrContext> localEnv = env.dup(that);
2946 try {
2947 //attribute member reference qualifier - if this is a constructor
2948 //reference, the expected kind must be a type
2949 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2950
2951 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2952 exprType = chk.checkConstructorRefType(that.expr, exprType);
2953 if (!exprType.isErroneous() &&
2954 exprType.isRaw() &&
2955 that.typeargs != null) {
2956 log.error(that.expr.pos(),
2957 Errors.InvalidMref(Kinds.kindName(that.getMode()),
2958 Fragments.MrefInferAndExplicitParams));
2959 exprType = types.createErrorType(exprType);
2960 }
2961 }
2962
2963 if (exprType.isErroneous()) {
2964 //if the qualifier expression contains problems,
2965 //give up attribution of method reference
2966 result = that.type = exprType;
2967 return;
2968 }
2969
2970 if (TreeInfo.isStaticSelector(that.expr, names)) {
2971 //if the qualifier is a type, validate it; raw warning check is
2972 //omitted as we don't know at this stage as to whether this is a
2973 //raw selector (because of inference)
2974 chk.validate(that.expr, env, false);
2975 } else {
2976 Symbol lhsSym = TreeInfo.symbol(that.expr);
2977 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
2978 }
2979 //attrib type-arguments
2980 List<Type> typeargtypes = List.nil();
2981 if (that.typeargs != null) {
2982 typeargtypes = attribTypes(that.typeargs, localEnv);
2983 }
2984
2985 boolean isTargetSerializable =
2986 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2987 isSerializable(pt());
2988 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
2989 Type currentTarget = targetInfo.target;
2990 Type desc = targetInfo.descriptor;
2991
2992 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
2993 List<Type> argtypes = desc.getParameterTypes();
2994 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2995
2996 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2997 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2998 }
2999
3000 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3001 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3002 try {
3003 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3004 that.name, argtypes, typeargtypes, referenceCheck,
3005 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3006 } finally {
3007 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3008 }
3009
3010 Symbol refSym = refResult.fst;
3011 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3012
3013 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3014 * JDK-8075541
3015 */
3016 if (refSym.kind != MTH) {
3017 boolean targetError;
3018 switch (refSym.kind) {
3019 case ABSENT_MTH:
3020 case MISSING_ENCL:
3021 targetError = false;
3022 break;
3023 case WRONG_MTH:
3024 case WRONG_MTHS:
3025 case AMBIGUOUS:
3026 case HIDDEN:
3027 case STATICERR:
3028 targetError = true;
3029 break;
3030 default:
3031 Assert.error("unexpected result kind " + refSym.kind);
3032 targetError = false;
3033 }
3034
3035 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3036 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3037
3038 JCDiagnostic.DiagnosticType diagKind = targetError ?
3039 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
3040
3041 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
3042 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
3043
3044 if (targetError && currentTarget == Type.recoveryType) {
3045 //a target error doesn't make sense during recovery stage
3046 //as we don't know what actual parameter types are
3047 result = that.type = currentTarget;
3048 return;
3049 } else {
3050 if (targetError) {
3051 resultInfo.checkContext.report(that, diag);
3052 } else {
3053 log.report(diag);
3054 }
3055 result = that.type = types.createErrorType(currentTarget);
3056 return;
3057 }
3058 }
3059
3060 that.sym = refSym.baseSymbol();
3061 that.kind = lookupHelper.referenceKind(that.sym);
3062 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3063
3064 if (desc.getReturnType() == Type.recoveryType) {
3065 // stop here
3066 result = that.type = currentTarget;
3067 return;
3068 }
3069
3070 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3071 Type enclosingType = exprType.getEnclosingType();
3072 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3073 // Check for the existence of an apropriate outer instance
3074 rs.resolveImplicitThis(that.pos(), env, exprType);
3075 }
3076 }
3077
3078 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3079
3080 if (that.getMode() == ReferenceMode.INVOKE &&
3081 TreeInfo.isStaticSelector(that.expr, names) &&
3082 that.kind.isUnbound() &&
3083 lookupHelper.site.isRaw()) {
3084 chk.checkRaw(that.expr, localEnv);
3085 }
3086
3087 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3088 exprType.getTypeArguments().nonEmpty()) {
3089 //static ref with class type-args
3090 log.error(that.expr.pos(),
3091 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3092 Fragments.StaticMrefWithTargs));
3093 result = that.type = types.createErrorType(currentTarget);
3094 return;
3095 }
3096
3097 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3098 // Check that super-qualified symbols are not abstract (JLS)
3099 rs.checkNonAbstract(that.pos(), that.sym);
3100 }
3101
3102 if (isTargetSerializable) {
3103 chk.checkAccessFromSerializableElement(that, true);
3104 }
3105 }
3106
3107 ResultInfo checkInfo =
3108 resultInfo.dup(newMethodTemplate(
3109 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3110 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3111 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3112
3113 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3114
3115 if (that.kind.isUnbound() &&
3116 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3117 //re-generate inference constraints for unbound receiver
3118 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3119 //cannot happen as this has already been checked - we just need
3120 //to regenerate the inference constraints, as that has been lost
3121 //as a result of the call to inferenceContext.save()
3122 Assert.error("Can't get here");
3123 }
3124 }
3125
3126 if (!refType.isErroneous()) {
3127 refType = types.createMethodTypeWithReturn(refType,
3128 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3129 }
3130
3131 //go ahead with standard method reference compatibility check - note that param check
3132 //is a no-op (as this has been taken care during method applicability)
3133 boolean isSpeculativeRound =
3134 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3135
3136 that.type = currentTarget; //avoids recovery at this stage
3137 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3138 if (!isSpeculativeRound) {
3139 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3140 }
3141 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3142 } catch (Types.FunctionDescriptorLookupError ex) {
3143 JCDiagnostic cause = ex.getDiagnostic();
3144 resultInfo.checkContext.report(that, cause);
3145 result = that.type = types.createErrorType(pt());
3146 return;
3147 }
3148 }
3149 //where
3150 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3151 //if this is a constructor reference, the expected kind must be a type
3152 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3153 KindSelector.VAL_TYP : KindSelector.TYP,
3154 Type.noType);
3155 }
3156
3157
3158 @SuppressWarnings("fallthrough")
3159 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3160 InferenceContext inferenceContext = checkContext.inferenceContext();
3161 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3162
3163 Type resType;
3164 switch (tree.getMode()) {
3165 case NEW:
3166 if (!tree.expr.type.isRaw()) {
3167 resType = tree.expr.type;
3168 break;
3169 }
3170 default:
3171 resType = refType.getReturnType();
3172 }
3173
3174 Type incompatibleReturnType = resType;
3175
3176 if (returnType.hasTag(VOID)) {
3177 incompatibleReturnType = null;
3178 }
3179
3180 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3181 if (resType.isErroneous() ||
3182 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3183 checkContext.checkWarner(tree, resType, returnType))) {
3184 incompatibleReturnType = null;
3185 }
3186 }
3187
3188 if (incompatibleReturnType != null) {
3189 Fragment msg =
3190 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3191 checkContext.report(tree, diags.fragment(msg));
3192 } else {
3193 if (inferenceContext.free(refType)) {
3194 // we need to wait for inference to finish and then replace inference vars in the referent type
3195 inferenceContext.addFreeTypeListener(List.of(refType),
3196 instantiatedContext -> {
3197 tree.referentType = instantiatedContext.asInstType(refType);
3198 });
3199 } else {
3200 tree.referentType = refType;
3201 }
3202 }
3203
3204 if (!speculativeAttr) {
3205 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3206 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3207 }
3208 }
3209 }
3210
3211 boolean checkExConstraints(
3212 List<Type> thrownByFuncExpr,
3213 List<Type> thrownAtFuncType,
3214 InferenceContext inferenceContext) {
3215 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3216 * are not proper types
3217 */
3218 List<Type> nonProperList = thrownAtFuncType.stream()
3219 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3220 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3221
3222 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3223 * in the throws clause of the invocation type of the method reference's compile-time
3224 * declaration
3225 */
3226 List<Type> checkedList = thrownByFuncExpr.stream()
3227 .filter(e -> chk.isChecked(e)).collect(List.collector());
3228
3229 /** If n = 0 (the function type's throws clause consists only of proper types), then
3230 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3231 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3232 * reduces to true
3233 */
3234 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3235 for (Type checked : checkedList) {
3236 boolean isSubtype = false;
3237 for (Type proper : properList) {
3238 if (types.isSubtype(checked, proper)) {
3239 isSubtype = true;
3240 break;
3241 }
3242 }
3243 if (!isSubtype) {
3244 uncaughtByProperTypes.add(checked);
3245 }
3246 }
3247
3248 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3249 return false;
3250 }
3251
3252 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3253 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3254 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3255 */
3256 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3257 uncaughtByProperTypes.forEach(checkedEx -> {
3258 nonProperAsUndet.forEach(nonProper -> {
3259 types.isSubtype(checkedEx, nonProper);
3260 });
3261 });
3262
3263 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3264 */
3265 nonProperAsUndet.stream()
3266 .filter(t -> t.hasTag(UNDETVAR))
3267 .forEach(t -> ((UndetVar)t).setThrow());
3268 return true;
3269 }
3270
3271 /**
3272 * Set functional type info on the underlying AST. Note: as the target descriptor
3273 * might contain inference variables, we might need to register an hook in the
3274 * current inference context.
3275 */
3276 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3277 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3278 if (checkContext.inferenceContext().free(descriptorType)) {
3279 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3280 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3281 inferenceContext.asInstType(primaryTarget), checkContext));
3282 } else {
3283 ListBuffer<Type> targets = new ListBuffer<>();
3284 if (pt.hasTag(CLASS)) {
3285 if (pt.isCompound()) {
3286 targets.append(types.removeWildcards(primaryTarget)); //this goes first
3287 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
3288 if (t != primaryTarget) {
3289 targets.append(types.removeWildcards(t));
3290 }
3291 }
3292 } else {
3293 targets.append(types.removeWildcards(primaryTarget));
3294 }
3295 }
3296 fExpr.targets = targets.toList();
3297 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3298 pt != Type.recoveryType) {
3299 //check that functional interface class is well-formed
3300 try {
3301 /* Types.makeFunctionalInterfaceClass() may throw an exception
3302 * when it's executed post-inference. See the listener code
3303 * above.
3304 */
3305 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3306 names.empty, List.of(fExpr.targets.head), ABSTRACT);
3307 if (csym != null) {
3308 chk.checkImplementations(env.tree, csym, csym);
3309 try {
3310 //perform an additional functional interface check on the synthetic class,
3311 //as there may be spurious errors for raw targets - because of existing issues
3312 //with membership and inheritance (see JDK-8074570).
3313 csym.flags_field |= INTERFACE;
3314 types.findDescriptorType(csym.type);
3315 } catch (FunctionDescriptorLookupError err) {
3316 resultInfo.checkContext.report(fExpr,
3317 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.targets.head)));
3318 }
3319 }
3320 } catch (Types.FunctionDescriptorLookupError ex) {
3321 JCDiagnostic cause = ex.getDiagnostic();
3322 resultInfo.checkContext.report(env.tree, cause);
3323 }
3324 }
3325 }
3326 }
3327
3328 public void visitParens(JCParens tree) {
3329 Type owntype = attribTree(tree.expr, env, resultInfo);
3330 result = check(tree, owntype, pkind(), resultInfo);
3331 Symbol sym = TreeInfo.symbol(tree);
3332 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK))
3333 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3334 }
3335
3336 public void visitAssign(JCAssign tree) {
3337 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3338 Type capturedType = capture(owntype);
3339 attribExpr(tree.rhs, env, owntype);
3340 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3341 }
3342
3343 public void visitAssignop(JCAssignOp tree) {
3344 // Attribute arguments.
3345 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3346 Type operand = attribExpr(tree.rhs, env);
3347 // Find operator.
3348 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3349 if (operator != operators.noOpSymbol &&
3350 !owntype.isErroneous() &&
3351 !operand.isErroneous()) {
3352 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3353 chk.checkCastable(tree.rhs.pos(),
3354 operator.type.getReturnType(),
3355 owntype);
3356 }
3357 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3358 }
3359
3360 public void visitUnary(JCUnary tree) {
3361 // Attribute arguments.
3362 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3363 ? attribTree(tree.arg, env, varAssignmentInfo)
3364 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3365
3366 // Find operator.
3367 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3368 Type owntype = types.createErrorType(tree.type);
3369 if (operator != operators.noOpSymbol &&
3370 !argtype.isErroneous()) {
3371 owntype = (tree.getTag().isIncOrDecUnaryOp())
3372 ? tree.arg.type
3373 : operator.type.getReturnType();
3374 int opc = ((OperatorSymbol)operator).opcode;
3375
3376 // If the argument is constant, fold it.
3377 if (argtype.constValue() != null) {
3378 Type ctype = cfolder.fold1(opc, argtype);
3379 if (ctype != null) {
3380 owntype = cfolder.coerce(ctype, owntype);
3381 }
3382 }
3383 }
3384 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3385 }
3386
3387 public void visitBinary(JCBinary tree) {
3388 // Attribute arguments.
3389 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3390 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env));
3391 // Find operator.
3392 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
3393 Type owntype = types.createErrorType(tree.type);
3394 if (operator != operators.noOpSymbol &&
3395 !left.isErroneous() &&
3396 !right.isErroneous()) {
3397 owntype = operator.type.getReturnType();
3398 int opc = ((OperatorSymbol)operator).opcode;
3399 // If both arguments are constants, fold them.
3400 if (left.constValue() != null && right.constValue() != null) {
3401 Type ctype = cfolder.fold2(opc, left, right);
3402 if (ctype != null) {
3403 owntype = cfolder.coerce(ctype, owntype);
3404 }
3405 }
3406
3407 // Check that argument types of a reference ==, != are
3408 // castable to each other, (JLS 15.21). Note: unboxing
3409 // comparisons will not have an acmp* opc at this point.
3410 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3411 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3412 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
3413 }
3414 }
3415
3416 chk.checkDivZero(tree.rhs.pos(), operator, right);
3417 }
3418 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3419 }
3420
3421 public void visitTypeCast(final JCTypeCast tree) {
3422 Type clazztype = attribType(tree.clazz, env);
3423 chk.validate(tree.clazz, env, false);
3424 //a fresh environment is required for 292 inference to work properly ---
3425 //see Infer.instantiatePolymorphicSignatureInstance()
3426 Env<AttrContext> localEnv = env.dup(tree);
3427 //should we propagate the target type?
3428 final ResultInfo castInfo;
3429 JCExpression expr = TreeInfo.skipParens(tree.expr);
3430 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3431 if (isPoly) {
3432 //expression is a poly - we need to propagate target type info
3433 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
3434 new Check.NestedCheckContext(resultInfo.checkContext) {
3435 @Override
3436 public boolean compatible(Type found, Type req, Warner warn) {
3437 return types.isCastable(found, req, warn);
3438 }
3439 });
3440 } else {
3441 //standalone cast - target-type info is not propagated
3442 castInfo = unknownExprInfo;
3443 }
3444 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3445 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3446 if (exprtype.constValue() != null)
3447 owntype = cfolder.coerce(exprtype, owntype);
3448 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
3449 if (!isPoly)
3450 chk.checkRedundantCast(localEnv, tree);
3451 }
3452
3453 public void visitTypeTest(JCInstanceOf tree) {
3454 Type exprtype = chk.checkNullOrRefType(
3455 tree.expr.pos(), attribExpr(tree.expr, env));
3456 Type clazztype = attribType(tree.clazz, env);
3457 if (!clazztype.hasTag(TYPEVAR)) {
3458 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3459 }
3460 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3461 log.error(tree.clazz.pos(), Errors.IllegalGenericTypeForInstof);
3462 clazztype = types.createErrorType(clazztype);
3463 }
3464 chk.validate(tree.clazz, env, false);
3465 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3466 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
3467 }
3468
3469 public void visitIndexed(JCArrayAccess tree) {
3470 Type owntype = types.createErrorType(tree.type);
3471 Type atype = attribExpr(tree.indexed, env);
3472 attribExpr(tree.index, env, syms.intType);
3473 if (types.isArray(atype))
3474 owntype = types.elemtype(atype);
3475 else if (!atype.hasTag(ERROR))
3476 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
3477 if (!pkind().contains(KindSelector.VAL))
3478 owntype = capture(owntype);
3479 result = check(tree, owntype, KindSelector.VAR, resultInfo);
3480 }
3481
3482 public void visitIdent(JCIdent tree) {
3483 Symbol sym;
3484
3485 // Find symbol
3486 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3487 // If we are looking for a method, the prototype `pt' will be a
3488 // method type with the type of the call's arguments as parameters.
3489 env.info.pendingResolutionPhase = null;
3490 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3491 } else if (tree.sym != null && tree.sym.kind != VAR) {
3492 sym = tree.sym;
3493 } else {
3494 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3495 }
3496 tree.sym = sym;
3497
3498 // (1) Also find the environment current for the class where
3499 // sym is defined (`symEnv').
3500 // Only for pre-tiger versions (1.4 and earlier):
3501 // (2) Also determine whether we access symbol out of an anonymous
3502 // class in a this or super call. This is illegal for instance
3503 // members since such classes don't carry a this$n link.
3504 // (`noOuterThisPath').
3505 Env<AttrContext> symEnv = env;
3506 boolean noOuterThisPath = false;
3507 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3508 sym.kind.matches(KindSelector.VAL_MTH) &&
3509 sym.owner.kind == TYP &&
3510 tree.name != names._this && tree.name != names._super) {
3511
3512 // Find environment in which identifier is defined.
3513 while (symEnv.outer != null &&
3514 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3515 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3516 noOuterThisPath = false;
3517 symEnv = symEnv.outer;
3518 }
3519 }
3520
3521 // If symbol is a variable, ...
3522 if (sym.kind == VAR) {
3523 VarSymbol v = (VarSymbol)sym;
3524
3525 // ..., evaluate its initializer, if it has one, and check for
3526 // illegal forward reference.
3527 checkInit(tree, env, v, false);
3528
3529 // If we are expecting a variable (as opposed to a value), check
3530 // that the variable is assignable in the current environment.
3531 if (KindSelector.ASG.subset(pkind()))
3532 checkAssignable(tree.pos(), v, null, env);
3533 }
3534
3535 // In a constructor body,
3536 // if symbol is a field or instance method, check that it is
3537 // not accessed before the supertype constructor is called.
3538 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3539 sym.kind.matches(KindSelector.VAL_MTH) &&
3540 sym.owner.kind == TYP &&
3541 (sym.flags() & STATIC) == 0) {
3542 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
3543 sym : thisSym(tree.pos(), env));
3544 }
3545 Env<AttrContext> env1 = env;
3546 if (sym.kind != ERR && sym.kind != TYP &&
3547 sym.owner != null && sym.owner != env1.enclClass.sym) {
3548 // If the found symbol is inaccessible, then it is
3549 // accessed through an enclosing instance. Locate this
3550 // enclosing instance:
3551 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3552 env1 = env1.outer;
3553 }
3554
3555 if (env.info.isSerializable) {
3556 chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
3557 }
3558
3559 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3560 }
3561
3562 public void visitSelect(JCFieldAccess tree) {
3563 // Determine the expected kind of the qualifier expression.
3564 KindSelector skind = KindSelector.NIL;
3565 if (tree.name == names._this || tree.name == names._super ||
3566 tree.name == names._class)
3567 {
3568 skind = KindSelector.TYP;
3569 } else {
3570 if (pkind().contains(KindSelector.PCK))
3571 skind = KindSelector.of(skind, KindSelector.PCK);
3572 if (pkind().contains(KindSelector.TYP))
3573 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
3574 if (pkind().contains(KindSelector.VAL_MTH))
3575 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
3576 }
3577
3578 // Attribute the qualifier expression, and determine its symbol (if any).
3579 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
3580 if (!pkind().contains(KindSelector.TYP_PCK))
3581 site = capture(site); // Capture field access
3582
3583 // don't allow T.class T[].class, etc
3584 if (skind == KindSelector.TYP) {
3585 Type elt = site;
3586 while (elt.hasTag(ARRAY))
3587 elt = ((ArrayType)elt).elemtype;
3588 if (elt.hasTag(TYPEVAR)) {
3589 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
3590 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
3591 tree.sym = tree.type.tsym;
3592 return ;
3593 }
3594 }
3595
3596 // If qualifier symbol is a type or `super', assert `selectSuper'
3597 // for the selection. This is relevant for determining whether
3598 // protected symbols are accessible.
3599 Symbol sitesym = TreeInfo.symbol(tree.selected);
3600 boolean selectSuperPrev = env.info.selectSuper;
3601 env.info.selectSuper =
3602 sitesym != null &&
3603 sitesym.name == names._super;
3604
3605 // Determine the symbol represented by the selection.
3606 env.info.pendingResolutionPhase = null;
3607 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3608 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
3609 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
3610 sym = syms.errSymbol;
3611 }
3612 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
3613 site = capture(site);
3614 sym = selectSym(tree, sitesym, site, env, resultInfo);
3615 }
3616 boolean varArgs = env.info.lastResolveVarargs();
3617 tree.sym = sym;
3618
3619 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3620 site = types.skipTypeVars(site, true);
3621 }
3622
3623 // If that symbol is a variable, ...
3624 if (sym.kind == VAR) {
3625 VarSymbol v = (VarSymbol)sym;
3626
3627 // ..., evaluate its initializer, if it has one, and check for
3628 // illegal forward reference.
3629 checkInit(tree, env, v, true);
3630
3631 // If we are expecting a variable (as opposed to a value), check
3632 // that the variable is assignable in the current environment.
3633 if (KindSelector.ASG.subset(pkind()))
3634 checkAssignable(tree.pos(), v, tree.selected, env);
3635 }
3636
3637 if (sitesym != null &&
3638 sitesym.kind == VAR &&
3639 ((VarSymbol)sitesym).isResourceVariable() &&
3640 sym.kind == MTH &&
3641 sym.name.equals(names.close) &&
3642 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3643 env.info.lint.isEnabled(LintCategory.TRY)) {
3644 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
3645 }
3646
3647 // Disallow selecting a type from an expression
3648 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
3649 tree.type = check(tree.selected, pt(),
3650 sitesym == null ?
3651 KindSelector.VAL : sitesym.kind.toSelector(),
3652 new ResultInfo(KindSelector.TYP_PCK, pt()));
3653 }
3654
3655 if (isType(sitesym)) {
3656 if (sym.name == names._this) {
3657 // If `C' is the currently compiled class, check that
3658 // C.this' does not appear in a call to a super(...)
3659 if (env.info.isSelfCall &&
3660 site.tsym == env.enclClass.sym) {
3661 chk.earlyRefError(tree.pos(), sym);
3662 }
3663 } else {
3664 // Check if type-qualified fields or methods are static (JLS)
3665 if ((sym.flags() & STATIC) == 0 &&
3666 sym.name != names._super &&
3667 (sym.kind == VAR || sym.kind == MTH)) {
3668 rs.accessBase(rs.new StaticError(sym),
3669 tree.pos(), site, sym.name, true);
3670 }
3671 }
3672 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
3673 sym.isStatic() && sym.kind == MTH) {
3674 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
3675 }
3676 } else if (sym.kind != ERR &&
3677 (sym.flags() & STATIC) != 0 &&
3678 sym.name != names._class) {
3679 // If the qualified item is not a type and the selected item is static, report
3680 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3681 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
3682 }
3683
3684 // If we are selecting an instance member via a `super', ...
3685 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3686
3687 // Check that super-qualified symbols are not abstract (JLS)
3688 rs.checkNonAbstract(tree.pos(), sym);
3689
3690 if (site.isRaw()) {
3691 // Determine argument types for site.
3692 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3693 if (site1 != null) site = site1;
3694 }
3695 }
3696
3697 if (env.info.isSerializable) {
3698 chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
3699 }
3700
3701 env.info.selectSuper = selectSuperPrev;
3702 result = checkId(tree, site, sym, env, resultInfo);
3703 }
3704 //where
3705 /** Determine symbol referenced by a Select expression,
3706 *
3707 * @param tree The select tree.
3708 * @param site The type of the selected expression,
3709 * @param env The current environment.
3710 * @param resultInfo The current result.
3711 */
3712 private Symbol selectSym(JCFieldAccess tree,
3713 Symbol location,
3714 Type site,
3715 Env<AttrContext> env,
3716 ResultInfo resultInfo) {
3717 DiagnosticPosition pos = tree.pos();
3718 Name name = tree.name;
3719 switch (site.getTag()) {
3720 case PACKAGE:
3721 return rs.accessBase(
3722 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3723 pos, location, site, name, true);
3724 case ARRAY:
3725 case CLASS:
3726 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3727 return rs.resolveQualifiedMethod(
3728 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3729 } else if (name == names._this || name == names._super) {
3730 return rs.resolveSelf(pos, env, site.tsym, name);
3731 } else if (name == names._class) {
3732 // In this case, we have already made sure in
3733 // visitSelect that qualifier expression is a type.
3734 Type t = syms.classType;
3735 List<Type> typeargs = List.of(types.erasure(site));
3736 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3737 return new VarSymbol(
3738 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3739 } else {
3740 // We are seeing a plain identifier as selector.
3741 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3742 sym = rs.accessBase(sym, pos, location, site, name, true);
3743 return sym;
3744 }
3745 case WILDCARD:
3746 throw new AssertionError(tree);
3747 case TYPEVAR:
3748 // Normally, site.getUpperBound() shouldn't be null.
3749 // It should only happen during memberEnter/attribBase
3750 // when determining the super type which *must* beac
3751 // done before attributing the type variables. In
3752 // other words, we are seeing this illegal program:
3753 // class B<T> extends A<T.foo> {}
3754 Symbol sym = (site.getUpperBound() != null)
3755 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3756 : null;
3757 if (sym == null) {
3758 log.error(pos, Errors.TypeVarCantBeDeref);
3759 return syms.errSymbol;
3760 } else {
3761 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3762 rs.new AccessError(env, site, sym) :
3763 sym;
3764 rs.accessBase(sym2, pos, location, site, name, true);
3765 return sym;
3766 }
3767 case ERROR:
3768 // preserve identifier names through errors
3769 return types.createErrorType(name, site.tsym, site).tsym;
3770 default:
3771 // The qualifier expression is of a primitive type -- only
3772 // .class is allowed for these.
3773 if (name == names._class) {
3774 // In this case, we have already made sure in Select that
3775 // qualifier expression is a type.
3776 Type t = syms.classType;
3777 Type arg = types.boxedClass(site).type;
3778 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3779 return new VarSymbol(
3780 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3781 } else {
3782 log.error(pos, Errors.CantDeref(site));
3783 return syms.errSymbol;
3784 }
3785 }
3786 }
3787
3788 /** Determine type of identifier or select expression and check that
3789 * (1) the referenced symbol is not deprecated
3790 * (2) the symbol's type is safe (@see checkSafe)
3791 * (3) if symbol is a variable, check that its type and kind are
3792 * compatible with the prototype and protokind.
3793 * (4) if symbol is an instance field of a raw type,
3794 * which is being assigned to, issue an unchecked warning if its
3795 * type changes under erasure.
3796 * (5) if symbol is an instance method of a raw type, issue an
3797 * unchecked warning if its argument types change under erasure.
3798 * If checks succeed:
3799 * If symbol is a constant, return its constant type
3800 * else if symbol is a method, return its result type
3801 * otherwise return its type.
3802 * Otherwise return errType.
3803 *
3804 * @param tree The syntax tree representing the identifier
3805 * @param site If this is a select, the type of the selected
3806 * expression, otherwise the type of the current class.
3807 * @param sym The symbol representing the identifier.
3808 * @param env The current environment.
3809 * @param resultInfo The expected result
3810 */
3811 Type checkId(JCTree tree,
3812 Type site,
3813 Symbol sym,
3814 Env<AttrContext> env,
3815 ResultInfo resultInfo) {
3816 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3817 checkMethodId(tree, site, sym, env, resultInfo) :
3818 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3819 }
3820
3821 Type checkMethodId(JCTree tree,
3822 Type site,
3823 Symbol sym,
3824 Env<AttrContext> env,
3825 ResultInfo resultInfo) {
3826 boolean isPolymorhicSignature =
3827 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3828 return isPolymorhicSignature ?
3829 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3830 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3831 }
3832
3833 Type checkSigPolyMethodId(JCTree tree,
3834 Type site,
3835 Symbol sym,
3836 Env<AttrContext> env,
3837 ResultInfo resultInfo) {
3838 //recover original symbol for signature polymorphic methods
3839 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3840 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3841 return sym.type;
3842 }
3843
3844 Type checkMethodIdInternal(JCTree tree,
3845 Type site,
3846 Symbol sym,
3847 Env<AttrContext> env,
3848 ResultInfo resultInfo) {
3849 if (resultInfo.pkind.contains(KindSelector.POLY)) {
3850 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3851 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3852 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3853 return owntype;
3854 } else {
3855 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3856 }
3857 }
3858
3859 Type checkIdInternal(JCTree tree,
3860 Type site,
3861 Symbol sym,
3862 Type pt,
3863 Env<AttrContext> env,
3864 ResultInfo resultInfo) {
3865 if (pt.isErroneous()) {
3866 return types.createErrorType(site);
3867 }
3868 Type owntype; // The computed type of this identifier occurrence.
3869 switch (sym.kind) {
3870 case TYP:
3871 // For types, the computed type equals the symbol's type,
3872 // except for two situations:
3873 owntype = sym.type;
3874 if (owntype.hasTag(CLASS)) {
3875 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3876 Type ownOuter = owntype.getEnclosingType();
3877
3878 // (a) If the symbol's type is parameterized, erase it
3879 // because no type parameters were given.
3880 // We recover generic outer type later in visitTypeApply.
3881 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3882 owntype = types.erasure(owntype);
3883 }
3884
3885 // (b) If the symbol's type is an inner class, then
3886 // we have to interpret its outer type as a superclass
3887 // of the site type. Example:
3888 //
3889 // class Tree<A> { class Visitor { ... } }
3890 // class PointTree extends Tree<Point> { ... }
3891 // ...PointTree.Visitor...
3892 //
3893 // Then the type of the last expression above is
3894 // Tree<Point>.Visitor.
3895 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3896 Type normOuter = site;
3897 if (normOuter.hasTag(CLASS)) {
3898 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3899 }
3900 if (normOuter == null) // perhaps from an import
3901 normOuter = types.erasure(ownOuter);
3902 if (normOuter != ownOuter)
3903 owntype = new ClassType(
3904 normOuter, List.nil(), owntype.tsym,
3905 owntype.getMetadata());
3906 }
3907 }
3908 break;
3909 case VAR:
3910 VarSymbol v = (VarSymbol)sym;
3911
3912 if (env.info.enclVar != null
3913 && v.type.hasTag(NONE)) {
3914 //self reference to implicitly typed variable declaration
3915 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
3916 return v.type = types.createErrorType(v.type);
3917 }
3918
3919 // Test (4): if symbol is an instance field of a raw type,
3920 // which is being assigned to, issue an unchecked warning if
3921 // its type changes under erasure.
3922 if (KindSelector.ASG.subset(pkind()) &&
3923 v.owner.kind == TYP &&
3924 (v.flags() & STATIC) == 0 &&
3925 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3926 Type s = types.asOuterSuper(site, v.owner);
3927 if (s != null &&
3928 s.isRaw() &&
3929 !types.isSameType(v.type, v.erasure(types))) {
3930 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
3931 }
3932 }
3933 // The computed type of a variable is the type of the
3934 // variable symbol, taken as a member of the site type.
3935 owntype = (sym.owner.kind == TYP &&
3936 sym.name != names._this && sym.name != names._super)
3937 ? types.memberType(site, sym)
3938 : sym.type;
3939
3940 // If the variable is a constant, record constant value in
3941 // computed type.
3942 if (v.getConstValue() != null && isStaticReference(tree))
3943 owntype = owntype.constType(v.getConstValue());
3944
3945 if (resultInfo.pkind == KindSelector.VAL) {
3946 owntype = capture(owntype); // capture "names as expressions"
3947 }
3948 break;
3949 case MTH: {
3950 owntype = checkMethod(site, sym,
3951 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
3952 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3953 resultInfo.pt.getTypeArguments());
3954 break;
3955 }
3956 case PCK: case ERR:
3957 owntype = sym.type;
3958 break;
3959 default:
3960 throw new AssertionError("unexpected kind: " + sym.kind +
3961 " in tree " + tree);
3962 }
3963
3964 // Emit a `deprecation' warning if symbol is deprecated.
3965 // (for constructors (but not for constructor references), the error
3966 // was given when the constructor was resolved)
3967
3968 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
3969 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3970 chk.checkSunAPI(tree.pos(), sym);
3971 chk.checkProfile(tree.pos(), sym);
3972 }
3973
3974 // If symbol is a variable, check that its type and
3975 // kind are compatible with the prototype and protokind.
3976 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
3977 }
3978
3979 /** Check that variable is initialized and evaluate the variable's
3980 * initializer, if not yet done. Also check that variable is not
3981 * referenced before it is defined.
3982 * @param tree The tree making up the variable reference.
3983 * @param env The current environment.
3984 * @param v The variable's symbol.
3985 */
3986 private void checkInit(JCTree tree,
3987 Env<AttrContext> env,
3988 VarSymbol v,
3989 boolean onlyWarning) {
3990 // A forward reference is diagnosed if the declaration position
3991 // of the variable is greater than the current tree position
3992 // and the tree and variable definition occur in the same class
3993 // definition. Note that writes don't count as references.
3994 // This check applies only to class and instance
3995 // variables. Local variables follow different scope rules,
3996 // and are subject to definite assignment checking.
3997 Env<AttrContext> initEnv = enclosingInitEnv(env);
3998 if (initEnv != null &&
3999 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
4000 v.owner.kind == TYP &&
4001 v.owner == env.info.scope.owner.enclClass() &&
4002 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
4003 (!env.tree.hasTag(ASSIGN) ||
4004 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
4005 if (!onlyWarning || isStaticEnumField(v)) {
4006 Error errkey = (initEnv.info.enclVar == v) ?
4007 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
4008 log.error(tree.pos(), errkey);
4009 } else if (useBeforeDeclarationWarning) {
4010 Warning warnkey = (initEnv.info.enclVar == v) ?
4011 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
4012 log.warning(tree.pos(), warnkey);
4013 }
4014 }
4015
4016 v.getConstValue(); // ensure initializer is evaluated
4017
4018 checkEnumInitializer(tree, env, v);
4019 }
4020
4021 /**
4022 * Returns the enclosing init environment associated with this env (if any). An init env
4023 * can be either a field declaration env or a static/instance initializer env.
4024 */
4025 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
4026 while (true) {
4027 switch (env.tree.getTag()) {
4028 case VARDEF:
4029 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
4030 if (vdecl.sym.owner.kind == TYP) {
4031 //field
4032 return env;
4033 }
4034 break;
4035 case BLOCK:
4036 if (env.next.tree.hasTag(CLASSDEF)) {
4037 //instance/static initializer
4038 return env;
4039 }
4040 break;
4041 case METHODDEF:
4042 case CLASSDEF:
4043 case TOPLEVEL:
4044 return null;
4045 }
4046 Assert.checkNonNull(env.next);
4047 env = env.next;
4048 }
4049 }
4050
4051 /**
4052 * Check for illegal references to static members of enum. In
4053 * an enum type, constructors and initializers may not
4054 * reference its static members unless they are constant.
4055 *
4056 * @param tree The tree making up the variable reference.
4057 * @param env The current environment.
4058 * @param v The variable's symbol.
4059 * @jls section 8.9 Enums
4060 */
4061 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4062 // JLS:
4063 //
4064 // "It is a compile-time error to reference a static field
4065 // of an enum type that is not a compile-time constant
4066 // (15.28) from constructors, instance initializer blocks,
4067 // or instance variable initializer expressions of that
4068 // type. It is a compile-time error for the constructors,
4069 // instance initializer blocks, or instance variable
4070 // initializer expressions of an enum constant e to refer
4071 // to itself or to an enum constant of the same type that
4072 // is declared to the right of e."
4073 if (isStaticEnumField(v)) {
4074 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4075
4076 if (enclClass == null || enclClass.owner == null)
4077 return;
4078
4079 // See if the enclosing class is the enum (or a
4080 // subclass thereof) declaring v. If not, this
4081 // reference is OK.
4082 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4083 return;
4084
4085 // If the reference isn't from an initializer, then
4086 // the reference is OK.
4087 if (!Resolve.isInitializer(env))
4088 return;
4089
4090 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4091 }
4092 }
4093
4094 /** Is the given symbol a static, non-constant field of an Enum?
4095 * Note: enum literals should not be regarded as such
4096 */
4097 private boolean isStaticEnumField(VarSymbol v) {
4098 return Flags.isEnum(v.owner) &&
4099 Flags.isStatic(v) &&
4100 !Flags.isConstant(v) &&
4101 v.name != names._class;
4102 }
4103
4104 /**
4105 * Check that method arguments conform to its instantiation.
4106 **/
4107 public Type checkMethod(Type site,
4108 final Symbol sym,
4109 ResultInfo resultInfo,
4110 Env<AttrContext> env,
4111 final List<JCExpression> argtrees,
4112 List<Type> argtypes,
4113 List<Type> typeargtypes) {
4114 // Test (5): if symbol is an instance method of a raw type, issue
4115 // an unchecked warning if its argument types change under erasure.
4116 if ((sym.flags() & STATIC) == 0 &&
4117 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4118 Type s = types.asOuterSuper(site, sym.owner);
4119 if (s != null && s.isRaw() &&
4120 !types.isSameTypes(sym.type.getParameterTypes(),
4121 sym.erasure(types).getParameterTypes())) {
4122 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4123 }
4124 }
4125
4126 if (env.info.defaultSuperCallSite != null) {
4127 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4128 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4129 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4130 List<MethodSymbol> icand_sup =
4131 types.interfaceCandidates(sup, (MethodSymbol)sym);
4132 if (icand_sup.nonEmpty() &&
4133 icand_sup.head != sym &&
4134 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4135 log.error(env.tree.pos(),
4136 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4137 break;
4138 }
4139 }
4140 env.info.defaultSuperCallSite = null;
4141 }
4142
4143 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4144 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4145 if (app.meth.hasTag(SELECT) &&
4146 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4147 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4148 }
4149 }
4150
4151 // Compute the identifier's instantiated type.
4152 // For methods, we need to compute the instance type by
4153 // Resolve.instantiate from the symbol's type as well as
4154 // any type arguments and value arguments.
4155 Warner noteWarner = new Warner();
4156 try {
4157 Type owntype = rs.checkMethod(
4158 env,
4159 site,
4160 sym,
4161 resultInfo,
4162 argtypes,
4163 typeargtypes,
4164 noteWarner);
4165
4166 DeferredAttr.DeferredTypeMap checkDeferredMap =
4167 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4168
4169 argtypes = argtypes.map(checkDeferredMap);
4170
4171 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4172 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4173 sym.name,
4174 rs.methodArguments(sym.type.getParameterTypes()),
4175 rs.methodArguments(argtypes.map(checkDeferredMap)),
4176 kindName(sym.location()),
4177 sym.location()));
4178 if (resultInfo.pt != Infer.anyPoly ||
4179 !owntype.hasTag(METHOD) ||
4180 !owntype.isPartial()) {
4181 //if this is not a partially inferred method type, erase return type. Otherwise,
4182 //erasure is carried out in PartiallyInferredMethodType.check().
4183 owntype = new MethodType(owntype.getParameterTypes(),
4184 types.erasure(owntype.getReturnType()),
4185 types.erasure(owntype.getThrownTypes()),
4186 syms.methodClass);
4187 }
4188 }
4189
4190 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4191 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4192 PolyKind.POLY : PolyKind.STANDALONE;
4193 TreeInfo.setPolyKind(env.tree, pkind);
4194
4195 return (resultInfo.pt == Infer.anyPoly) ?
4196 owntype :
4197 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4198 resultInfo.checkContext.inferenceContext());
4199 } catch (Infer.InferenceException ex) {
4200 //invalid target type - propagate exception outwards or report error
4201 //depending on the current check context
4202 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4203 return types.createErrorType(site);
4204 } catch (Resolve.InapplicableMethodException ex) {
4205 final JCDiagnostic diag = ex.getDiagnostic();
4206 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4207 @Override
4208 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4209 return new Pair<>(sym, diag);
4210 }
4211 };
4212 List<Type> argtypes2 = argtypes.map(
4213 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4214 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4215 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4216 log.report(errDiag);
4217 return types.createErrorType(site);
4218 }
4219 }
4220
4221 public void visitLiteral(JCLiteral tree) {
4222 result = check(tree, litType(tree.typetag).constType(tree.value),
4223 KindSelector.VAL, resultInfo);
4224 }
4225 //where
4226 /** Return the type of a literal with given type tag.
4227 */
4228 Type litType(TypeTag tag) {
4229 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4230 }
4231
4232 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4233 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4234 }
4235
4236 public void visitTypeArray(JCArrayTypeTree tree) {
4237 Type etype = attribType(tree.elemtype, env);
4238 Type type = new ArrayType(etype, syms.arrayClass);
4239 result = check(tree, type, KindSelector.TYP, resultInfo);
4240 }
4241
4242 /** Visitor method for parameterized types.
4243 * Bound checking is left until later, since types are attributed
4244 * before supertype structure is completely known
4245 */
4246 public void visitTypeApply(JCTypeApply tree) {
4247 Type owntype = types.createErrorType(tree.type);
4248
4249 // Attribute functor part of application and make sure it's a class.
4250 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4251
4252 // Attribute type parameters
4253 List<Type> actuals = attribTypes(tree.arguments, env);
4254
4255 if (clazztype.hasTag(CLASS)) {
4256 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4257 if (actuals.isEmpty()) //diamond
4258 actuals = formals;
4259
4260 if (actuals.length() == formals.length()) {
4261 List<Type> a = actuals;
4262 List<Type> f = formals;
4263 while (a.nonEmpty()) {
4264 a.head = a.head.withTypeVar(f.head);
4265 a = a.tail;
4266 f = f.tail;
4267 }
4268 // Compute the proper generic outer
4269 Type clazzOuter = clazztype.getEnclosingType();
4270 if (clazzOuter.hasTag(CLASS)) {
4271 Type site;
4272 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4273 if (clazz.hasTag(IDENT)) {
4274 site = env.enclClass.sym.type;
4275 } else if (clazz.hasTag(SELECT)) {
4276 site = ((JCFieldAccess) clazz).selected.type;
4277 } else throw new AssertionError(""+tree);
4278 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4279 if (site.hasTag(CLASS))
4280 site = types.asOuterSuper(site, clazzOuter.tsym);
4281 if (site == null)
4282 site = types.erasure(clazzOuter);
4283 clazzOuter = site;
4284 }
4285 }
4286 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4287 clazztype.getMetadata());
4288 } else {
4289 if (formals.length() != 0) {
4290 log.error(tree.pos(),
4291 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4292 } else {
4293 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4294 }
4295 owntype = types.createErrorType(tree.type);
4296 }
4297 }
4298 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4299 }
4300
4301 public void visitTypeUnion(JCTypeUnion tree) {
4302 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4303 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4304 for (JCExpression typeTree : tree.alternatives) {
4305 Type ctype = attribType(typeTree, env);
4306 ctype = chk.checkType(typeTree.pos(),
4307 chk.checkClassType(typeTree.pos(), ctype),
4308 syms.throwableType);
4309 if (!ctype.isErroneous()) {
4310 //check that alternatives of a union type are pairwise
4311 //unrelated w.r.t. subtyping
4312 if (chk.intersects(ctype, multicatchTypes.toList())) {
4313 for (Type t : multicatchTypes) {
4314 boolean sub = types.isSubtype(ctype, t);
4315 boolean sup = types.isSubtype(t, ctype);
4316 if (sub || sup) {
4317 //assume 'a' <: 'b'
4318 Type a = sub ? ctype : t;
4319 Type b = sub ? t : ctype;
4320 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4321 }
4322 }
4323 }
4324 multicatchTypes.append(ctype);
4325 if (all_multicatchTypes != null)
4326 all_multicatchTypes.append(ctype);
4327 } else {
4328 if (all_multicatchTypes == null) {
4329 all_multicatchTypes = new ListBuffer<>();
4330 all_multicatchTypes.appendList(multicatchTypes);
4331 }
4332 all_multicatchTypes.append(ctype);
4333 }
4334 }
4335 Type t = check(tree, types.lub(multicatchTypes.toList()),
4336 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
4337 if (t.hasTag(CLASS)) {
4338 List<Type> alternatives =
4339 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
4340 t = new UnionClassType((ClassType) t, alternatives);
4341 }
4342 tree.type = result = t;
4343 }
4344
4345 public void visitTypeIntersection(JCTypeIntersection tree) {
4346 attribTypes(tree.bounds, env);
4347 tree.type = result = checkIntersection(tree, tree.bounds);
4348 }
4349
4350 public void visitTypeParameter(JCTypeParameter tree) {
4351 TypeVar typeVar = (TypeVar) tree.type;
4352
4353 if (tree.annotations != null && tree.annotations.nonEmpty()) {
4354 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
4355 }
4356
4357 if (!typeVar.bound.isErroneous()) {
4358 //fixup type-parameter bound computed in 'attribTypeVariables'
4359 typeVar.bound = checkIntersection(tree, tree.bounds);
4360 }
4361 }
4362
4363 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
4364 Set<Type> boundSet = new HashSet<>();
4365 if (bounds.nonEmpty()) {
4366 // accept class or interface or typevar as first bound.
4367 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4368 boundSet.add(types.erasure(bounds.head.type));
4369 if (bounds.head.type.isErroneous()) {
4370 return bounds.head.type;
4371 }
4372 else if (bounds.head.type.hasTag(TYPEVAR)) {
4373 // if first bound was a typevar, do not accept further bounds.
4374 if (bounds.tail.nonEmpty()) {
4375 log.error(bounds.tail.head.pos(),
4376 Errors.TypeVarMayNotBeFollowedByOtherBounds);
4377 return bounds.head.type;
4378 }
4379 } else {
4380 // if first bound was a class or interface, accept only interfaces
4381 // as further bounds.
4382 for (JCExpression bound : bounds.tail) {
4383 bound.type = checkBase(bound.type, bound, env, false, true, false);
4384 if (bound.type.isErroneous()) {
4385 bounds = List.of(bound);
4386 }
4387 else if (bound.type.hasTag(CLASS)) {
4388 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4389 }
4390 }
4391 }
4392 }
4393
4394 if (bounds.length() == 0) {
4395 return syms.objectType;
4396 } else if (bounds.length() == 1) {
4397 return bounds.head.type;
4398 } else {
4399 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
4400 // ... the variable's bound is a class type flagged COMPOUND
4401 // (see comment for TypeVar.bound).
4402 // In this case, generate a class tree that represents the
4403 // bound class, ...
4404 JCExpression extending;
4405 List<JCExpression> implementing;
4406 if (!bounds.head.type.isInterface()) {
4407 extending = bounds.head;
4408 implementing = bounds.tail;
4409 } else {
4410 extending = null;
4411 implementing = bounds;
4412 }
4413 JCClassDecl cd = make.at(tree).ClassDef(
4414 make.Modifiers(PUBLIC | ABSTRACT),
4415 names.empty, List.nil(),
4416 extending, implementing, List.nil());
4417
4418 ClassSymbol c = (ClassSymbol)owntype.tsym;
4419 Assert.check((c.flags() & COMPOUND) != 0);
4420 cd.sym = c;
4421 c.sourcefile = env.toplevel.sourcefile;
4422
4423 // ... and attribute the bound class
4424 c.flags_field |= UNATTRIBUTED;
4425 Env<AttrContext> cenv = enter.classEnv(cd, env);
4426 typeEnvs.put(c, cenv);
4427 attribClass(c);
4428 return owntype;
4429 }
4430 }
4431
4432 public void visitWildcard(JCWildcard tree) {
4433 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4434 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4435 ? syms.objectType
4436 : attribType(tree.inner, env);
4437 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4438 tree.kind.kind,
4439 syms.boundClass),
4440 KindSelector.TYP, resultInfo);
4441 }
4442
4443 public void visitAnnotation(JCAnnotation tree) {
4444 Assert.error("should be handled in annotate");
4445 }
4446
4447 public void visitAnnotatedType(JCAnnotatedType tree) {
4448 attribAnnotationTypes(tree.annotations, env);
4449 Type underlyingType = attribType(tree.underlyingType, env);
4450 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
4451
4452 if (!env.info.isNewClass)
4453 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
4454 result = tree.type = annotatedType;
4455 }
4456
4457 public void visitErroneous(JCErroneous tree) {
4458 if (tree.errs != null)
4459 for (JCTree err : tree.errs)
4460 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt()));
4461 result = tree.type = syms.errType;
4462 }
4463
4464 /** Default visitor method for all other trees.
4465 */
4466 public void visitTree(JCTree tree) {
4467 throw new AssertionError();
4468 }
4469
4470 /**
4471 * Attribute an env for either a top level tree or class or module declaration.
4472 */
4473 public void attrib(Env<AttrContext> env) {
4474 switch (env.tree.getTag()) {
4475 case MODULEDEF:
4476 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
4477 break;
4478 case TOPLEVEL:
4479 attribTopLevel(env);
4480 break;
4481 case PACKAGEDEF:
4482 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
4483 break;
4484 default:
4485 attribClass(env.tree.pos(), env.enclClass.sym);
4486 }
4487 }
4488
4489 /**
4490 * Attribute a top level tree. These trees are encountered when the
4491 * package declaration has annotations.
4492 */
4493 public void attribTopLevel(Env<AttrContext> env) {
4494 JCCompilationUnit toplevel = env.toplevel;
4495 try {
4496 annotate.flush();
4497 } catch (CompletionFailure ex) {
4498 chk.completionError(toplevel.pos(), ex);
4499 }
4500 }
4501
4502 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
4503 try {
4504 annotate.flush();
4505 attribPackage(p);
4506 } catch (CompletionFailure ex) {
4507 chk.completionError(pos, ex);
4508 }
4509 }
4510
4511 void attribPackage(PackageSymbol p) {
4512 Env<AttrContext> env = typeEnvs.get(p);
4513 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
4514 }
4515
4516 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
4517 try {
4518 annotate.flush();
4519 attribModule(m);
4520 } catch (CompletionFailure ex) {
4521 chk.completionError(pos, ex);
4522 }
4523 }
4524
4525 void attribModule(ModuleSymbol m) {
4526 // Get environment current at the point of module definition.
4527 Env<AttrContext> env = enter.typeEnvs.get(m);
4528 attribStat(env.tree, env);
4529 }
4530
4531 /** Main method: attribute class definition associated with given class symbol.
4532 * reporting completion failures at the given position.
4533 * @param pos The source position at which completion errors are to be
4534 * reported.
4535 * @param c The class symbol whose definition will be attributed.
4536 */
4537 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4538 try {
4539 annotate.flush();
4540 attribClass(c);
4541 } catch (CompletionFailure ex) {
4542 chk.completionError(pos, ex);
4543 }
4544 }
4545
4546 /** Attribute class definition associated with given class symbol.
4547 * @param c The class symbol whose definition will be attributed.
4548 */
4549 void attribClass(ClassSymbol c) throws CompletionFailure {
4550 if (c.type.hasTag(ERROR)) return;
4551
4552 // Check for cycles in the inheritance graph, which can arise from
4553 // ill-formed class files.
4554 chk.checkNonCyclic(null, c.type);
4555
4556 Type st = types.supertype(c.type);
4557 if ((c.flags_field & Flags.COMPOUND) == 0) {
4558 // First, attribute superclass.
4559 if (st.hasTag(CLASS))
4560 attribClass((ClassSymbol)st.tsym);
4561
4562 // Next attribute owner, if it is a class.
4563 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4564 attribClass((ClassSymbol)c.owner);
4565 }
4566
4567 // The previous operations might have attributed the current class
4568 // if there was a cycle. So we test first whether the class is still
4569 // UNATTRIBUTED.
4570 if ((c.flags_field & UNATTRIBUTED) != 0) {
4571 c.flags_field &= ~UNATTRIBUTED;
4572
4573 // Get environment current at the point of class definition.
4574 Env<AttrContext> env = typeEnvs.get(c);
4575
4576 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
4577 // because the annotations were not available at the time the env was created. Therefore,
4578 // we look up the environment chain for the first enclosing environment for which the
4579 // lint value is set. Typically, this is the parent env, but might be further if there
4580 // are any envs created as a result of TypeParameter nodes.
4581 Env<AttrContext> lintEnv = env;
4582 while (lintEnv.info.lint == null)
4583 lintEnv = lintEnv.next;
4584
4585 // Having found the enclosing lint value, we can initialize the lint value for this class
4586 env.info.lint = lintEnv.info.lint.augment(c);
4587
4588 Lint prevLint = chk.setLint(env.info.lint);
4589 JavaFileObject prev = log.useSource(c.sourcefile);
4590 ResultInfo prevReturnRes = env.info.returnResult;
4591
4592 try {
4593 deferredLintHandler.flush(env.tree);
4594 env.info.returnResult = null;
4595 // java.lang.Enum may not be subclassed by a non-enum
4596 if (st.tsym == syms.enumSym &&
4597 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4598 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
4599
4600 // Enums may not be extended by source-level classes
4601 if (st.tsym != null &&
4602 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4603 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4604 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
4605 }
4606
4607 if (isSerializable(c.type)) {
4608 env.info.isSerializable = true;
4609 }
4610
4611 attribClassBody(env, c);
4612
4613 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4614 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4615 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4616 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
4617 } finally {
4618 env.info.returnResult = prevReturnRes;
4619 log.useSource(prev);
4620 chk.setLint(prevLint);
4621 }
4622
4623 }
4624 }
4625
4626 public void visitImport(JCImport tree) {
4627 // nothing to do
4628 }
4629
4630 public void visitModuleDef(JCModuleDecl tree) {
4631 tree.sym.completeUsesProvides();
4632 ModuleSymbol msym = tree.sym;
4633 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
4634 Lint prevLint = chk.setLint(lint);
4635 chk.checkModuleName(tree);
4636 chk.checkDeprecatedAnnotation(tree, msym);
4637
4638 try {
4639 deferredLintHandler.flush(tree.pos());
4640 } finally {
4641 chk.setLint(prevLint);
4642 }
4643 }
4644
4645 /** Finish the attribution of a class. */
4646 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4647 JCClassDecl tree = (JCClassDecl)env.tree;
4648 Assert.check(c == tree.sym);
4649
4650 // Validate type parameters, supertype and interfaces.
4651 attribStats(tree.typarams, env);
4652 if (!c.isAnonymous()) {
4653 //already checked if anonymous
4654 chk.validate(tree.typarams, env);
4655 chk.validate(tree.extending, env);
4656 chk.validate(tree.implementing, env);
4657 }
4658
4659 c.markAbstractIfNeeded(types);
4660
4661 // If this is a non-abstract class, check that it has no abstract
4662 // methods or unimplemented methods of an implemented interface.
4663 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4664 chk.checkAllDefined(tree.pos(), c);
4665 }
4666
4667 if ((c.flags() & ANNOTATION) != 0) {
4668 if (tree.implementing.nonEmpty())
4669 log.error(tree.implementing.head.pos(),
4670 Errors.CantExtendIntfAnnotation);
4671 if (tree.typarams.nonEmpty()) {
4672 log.error(tree.typarams.head.pos(),
4673 Errors.IntfAnnotationCantHaveTypeParams(c));
4674 }
4675
4676 // If this annotation type has a @Repeatable, validate
4677 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
4678 // If this annotation type has a @Repeatable, validate
4679 if (repeatable != null) {
4680 // get diagnostic position for error reporting
4681 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4682 Assert.checkNonNull(cbPos);
4683
4684 chk.validateRepeatable(c, repeatable, cbPos);
4685 }
4686 } else {
4687 // Check that all extended classes and interfaces
4688 // are compatible (i.e. no two define methods with same arguments
4689 // yet different return types). (JLS 8.4.6.3)
4690 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4691 if (allowDefaultMethods) {
4692 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4693 }
4694 }
4695
4696 // Check that class does not import the same parameterized interface
4697 // with two different argument lists.
4698 chk.checkClassBounds(tree.pos(), c.type);
4699
4700 tree.type = c.type;
4701
4702 for (List<JCTypeParameter> l = tree.typarams;
4703 l.nonEmpty(); l = l.tail) {
4704 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
4705 }
4706
4707 // Check that a generic class doesn't extend Throwable
4708 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4709 log.error(tree.extending.pos(), Errors.GenericThrowable);
4710
4711 // Check that all methods which implement some
4712 // method conform to the method they implement.
4713 chk.checkImplementations(tree);
4714
4715 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4716 checkAutoCloseable(tree.pos(), env, c.type);
4717
4718 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4719 // Attribute declaration
4720 attribStat(l.head, env);
4721 // Check that declarations in inner classes are not static (JLS 8.1.2)
4722 // Make an exception for static constants.
4723 if (c.owner.kind != PCK &&
4724 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4725 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4726 Symbol sym = null;
4727 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4728 if (sym == null ||
4729 sym.kind != VAR ||
4730 ((VarSymbol) sym).getConstValue() == null)
4731 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
4732 }
4733 }
4734
4735 // Check for cycles among non-initial constructors.
4736 chk.checkCyclicConstructors(tree);
4737
4738 // Check for cycles among annotation elements.
4739 chk.checkNonCyclicElements(tree);
4740
4741 // Check for proper use of serialVersionUID
4742 if (env.info.lint.isEnabled(LintCategory.SERIAL)
4743 && isSerializable(c.type)
4744 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0
4745 && !c.isAnonymous()) {
4746 checkSerialVersionUID(tree, c);
4747 }
4748 if (allowTypeAnnos) {
4749 // Correctly organize the postions of the type annotations
4750 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4751
4752 // Check type annotations applicability rules
4753 validateTypeAnnotations(tree, false);
4754 }
4755 }
4756 // where
4757 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4758 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4759 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4760 if (types.isSameType(al.head.annotationType.type, t))
4761 return al.head.pos();
4762 }
4763
4764 return null;
4765 }
4766
4767 /** check if a type is a subtype of Serializable, if that is available. */
4768 boolean isSerializable(Type t) {
4769 try {
4770 syms.serializableType.complete();
4771 }
4772 catch (CompletionFailure e) {
4773 return false;
4774 }
4775 return types.isSubtype(t, syms.serializableType);
4776 }
4777
4778 /** Check that an appropriate serialVersionUID member is defined. */
4779 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4780
4781 // check for presence of serialVersionUID
4782 VarSymbol svuid = null;
4783 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
4784 if (sym.kind == VAR) {
4785 svuid = (VarSymbol)sym;
4786 break;
4787 }
4788 }
4789
4790 if (svuid == null) {
4791 log.warning(LintCategory.SERIAL,
4792 tree.pos(), Warnings.MissingSVUID(c));
4793 return;
4794 }
4795
4796 // check that it is static final
4797 if ((svuid.flags() & (STATIC | FINAL)) !=
4798 (STATIC | FINAL))
4799 log.warning(LintCategory.SERIAL,
4800 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
4801
4802 // check that it is long
4803 else if (!svuid.type.hasTag(LONG))
4804 log.warning(LintCategory.SERIAL,
4805 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
4806
4807 // check constant
4808 else if (svuid.getConstValue() == null)
4809 log.warning(LintCategory.SERIAL,
4810 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
4811 }
4812
4813 private Type capture(Type type) {
4814 return types.capture(type);
4815 }
4816
4817 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
4818 if (type.isErroneous()) {
4819 tree.vartype = make.at(Position.NOPOS).Erroneous();
4820 } else {
4821 tree.vartype = make.at(Position.NOPOS).Type(type);
4822 }
4823 }
4824
4825 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4826 tree.accept(new TypeAnnotationsValidator(sigOnly));
4827 }
4828 //where
4829 private final class TypeAnnotationsValidator extends TreeScanner {
4830
4831 private final boolean sigOnly;
4832 public TypeAnnotationsValidator(boolean sigOnly) {
4833 this.sigOnly = sigOnly;
4834 }
4835
4836 public void visitAnnotation(JCAnnotation tree) {
4837 chk.validateTypeAnnotation(tree, false);
4838 super.visitAnnotation(tree);
4839 }
4840 public void visitAnnotatedType(JCAnnotatedType tree) {
4841 if (!tree.underlyingType.type.isErroneous()) {
4842 super.visitAnnotatedType(tree);
4843 }
4844 }
4845 public void visitTypeParameter(JCTypeParameter tree) {
4846 chk.validateTypeAnnotations(tree.annotations, true);
4847 scan(tree.bounds);
4848 // Don't call super.
4849 // This is needed because above we call validateTypeAnnotation with
4850 // false, which would forbid annotations on type parameters.
4851 // super.visitTypeParameter(tree);
4852 }
4853 public void visitMethodDef(JCMethodDecl tree) {
4854 if (tree.recvparam != null &&
4855 !tree.recvparam.vartype.type.isErroneous()) {
4856 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4857 tree.recvparam.vartype.type.tsym);
4858 }
4859 if (tree.restype != null && tree.restype.type != null) {
4860 validateAnnotatedType(tree.restype, tree.restype.type);
4861 }
4862 if (sigOnly) {
4863 scan(tree.mods);
4864 scan(tree.restype);
4865 scan(tree.typarams);
4866 scan(tree.recvparam);
4867 scan(tree.params);
4868 scan(tree.thrown);
4869 } else {
4870 scan(tree.defaultValue);
4871 scan(tree.body);
4872 }
4873 }
4874 public void visitVarDef(final JCVariableDecl tree) {
4875 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
4876 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
4877 validateAnnotatedType(tree.vartype, tree.sym.type);
4878 scan(tree.mods);
4879 scan(tree.vartype);
4880 if (!sigOnly) {
4881 scan(tree.init);
4882 }
4883 }
4884 public void visitTypeCast(JCTypeCast tree) {
4885 if (tree.clazz != null && tree.clazz.type != null)
4886 validateAnnotatedType(tree.clazz, tree.clazz.type);
4887 super.visitTypeCast(tree);
4888 }
4889 public void visitTypeTest(JCInstanceOf tree) {
4890 if (tree.clazz != null && tree.clazz.type != null)
4891 validateAnnotatedType(tree.clazz, tree.clazz.type);
4892 super.visitTypeTest(tree);
4893 }
4894 public void visitNewClass(JCNewClass tree) {
4895 if (tree.clazz != null && tree.clazz.type != null) {
4896 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4897 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4898 tree.clazz.type.tsym);
4899 }
4900 if (tree.def != null) {
4901 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4902 }
4903
4904 validateAnnotatedType(tree.clazz, tree.clazz.type);
4905 }
4906 super.visitNewClass(tree);
4907 }
4908 public void visitNewArray(JCNewArray tree) {
4909 if (tree.elemtype != null && tree.elemtype.type != null) {
4910 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4911 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4912 tree.elemtype.type.tsym);
4913 }
4914 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4915 }
4916 super.visitNewArray(tree);
4917 }
4918 public void visitClassDef(JCClassDecl tree) {
4919 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
4920 if (sigOnly) {
4921 scan(tree.mods);
4922 scan(tree.typarams);
4923 scan(tree.extending);
4924 scan(tree.implementing);
4925 }
4926 for (JCTree member : tree.defs) {
4927 if (member.hasTag(Tag.CLASSDEF)) {
4928 continue;
4929 }
4930 scan(member);
4931 }
4932 }
4933 public void visitBlock(JCBlock tree) {
4934 if (!sigOnly) {
4935 scan(tree.stats);
4936 }
4937 }
4938
4939 /* I would want to model this after
4940 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4941 * and override visitSelect and visitTypeApply.
4942 * However, we only set the annotated type in the top-level type
4943 * of the symbol.
4944 * Therefore, we need to override each individual location where a type
4945 * can occur.
4946 */
4947 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4948 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4949
4950 if (type.isPrimitiveOrVoid()) {
4951 return;
4952 }
4953
4954 JCTree enclTr = errtree;
4955 Type enclTy = type;
4956
4957 boolean repeat = true;
4958 while (repeat) {
4959 if (enclTr.hasTag(TYPEAPPLY)) {
4960 List<Type> tyargs = enclTy.getTypeArguments();
4961 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4962 if (trargs.length() > 0) {
4963 // Nothing to do for diamonds
4964 if (tyargs.length() == trargs.length()) {
4965 for (int i = 0; i < tyargs.length(); ++i) {
4966 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4967 }
4968 }
4969 // If the lengths don't match, it's either a diamond
4970 // or some nested type that redundantly provides
4971 // type arguments in the tree.
4972 }
4973
4974 // Look at the clazz part of a generic type
4975 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4976 }
4977
4978 if (enclTr.hasTag(SELECT)) {
4979 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4980 if (enclTy != null &&
4981 !enclTy.hasTag(NONE)) {
4982 enclTy = enclTy.getEnclosingType();
4983 }
4984 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4985 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4986 if (enclTy == null || enclTy.hasTag(NONE)) {
4987 if (at.getAnnotations().size() == 1) {
4988 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
4989 } else {
4990 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
4991 for (JCAnnotation an : at.getAnnotations()) {
4992 comps.add(an.attribute);
4993 }
4994 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
4995 }
4996 repeat = false;
4997 }
4998 enclTr = at.underlyingType;
4999 // enclTy doesn't need to be changed
5000 } else if (enclTr.hasTag(IDENT)) {
5001 repeat = false;
5002 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
5003 JCWildcard wc = (JCWildcard) enclTr;
5004 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
5005 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
5006 validateAnnotatedType(wc.getBound(), wc.getBound().type);
5007 } else {
5008 // Nothing to do for UNBOUND
5009 }
5010 repeat = false;
5011 } else if (enclTr.hasTag(TYPEARRAY)) {
5012 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
5013 validateAnnotatedType(art.getType(), art.elemtype.type);
5014 repeat = false;
5015 } else if (enclTr.hasTag(TYPEUNION)) {
5016 JCTypeUnion ut = (JCTypeUnion) enclTr;
5017 for (JCTree t : ut.getTypeAlternatives()) {
5018 validateAnnotatedType(t, t.type);
5019 }
5020 repeat = false;
5021 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
5022 JCTypeIntersection it = (JCTypeIntersection) enclTr;
5023 for (JCTree t : it.getBounds()) {
5024 validateAnnotatedType(t, t.type);
5025 }
5026 repeat = false;
5027 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
5028 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
5029 repeat = false;
5030 } else {
5031 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
5032 " within: "+ errtree + " with kind: " + errtree.getKind());
5033 }
5034 }
5035 }
5036
5037 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5038 Symbol sym) {
5039 // Ensure that no declaration annotations are present.
5040 // Note that a tree type might be an AnnotatedType with
5041 // empty annotations, if only declaration annotations were given.
5042 // This method will raise an error for such a type.
5043 for (JCAnnotation ai : annotations) {
5044 if (!ai.type.isErroneous() &&
5045 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5046 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5047 }
5048 }
5049 }
5050 }
5051
5052 // <editor-fold desc="post-attribution visitor">
5053
5054 /**
5055 * Handle missing types/symbols in an AST. This routine is useful when
5056 * the compiler has encountered some errors (which might have ended up
5057 * terminating attribution abruptly); if the compiler is used in fail-over
5058 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5059 * prevents NPE to be progagated during subsequent compilation steps.
5060 */
5061 public void postAttr(JCTree tree) {
5062 new PostAttrAnalyzer().scan(tree);
5063 }
5064
5065 class PostAttrAnalyzer extends TreeScanner {
5066
5067 private void initTypeIfNeeded(JCTree that) {
5068 if (that.type == null) {
5069 if (that.hasTag(METHODDEF)) {
5070 that.type = dummyMethodType((JCMethodDecl)that);
5071 } else {
5072 that.type = syms.unknownType;
5073 }
5074 }
5075 }
5076
5077 /* Construct a dummy method type. If we have a method declaration,
5078 * and the declared return type is void, then use that return type
5079 * instead of UNKNOWN to avoid spurious error messages in lambda
5080 * bodies (see:JDK-8041704).
5081 */
5082 private Type dummyMethodType(JCMethodDecl md) {
5083 Type restype = syms.unknownType;
5084 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5085 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5086 if (prim.typetag == VOID)
5087 restype = syms.voidType;
5088 }
5089 return new MethodType(List.nil(), restype,
5090 List.nil(), syms.methodClass);
5091 }
5092 private Type dummyMethodType() {
5093 return dummyMethodType(null);
5094 }
5095
5096 @Override
5097 public void scan(JCTree tree) {
5098 if (tree == null) return;
5099 if (tree instanceof JCExpression) {
5100 initTypeIfNeeded(tree);
5101 }
5102 super.scan(tree);
5103 }
5104
5105 @Override
5106 public void visitIdent(JCIdent that) {
5107 if (that.sym == null) {
5108 that.sym = syms.unknownSymbol;
5109 }
5110 }
5111
5112 @Override
5113 public void visitSelect(JCFieldAccess that) {
5114 if (that.sym == null) {
5115 that.sym = syms.unknownSymbol;
5116 }
5117 super.visitSelect(that);
5118 }
5119
5120 @Override
5121 public void visitClassDef(JCClassDecl that) {
5122 initTypeIfNeeded(that);
5123 if (that.sym == null) {
5124 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5125 }
5126 super.visitClassDef(that);
5127 }
5128
5129 @Override
5130 public void visitMethodDef(JCMethodDecl that) {
5131 initTypeIfNeeded(that);
5132 if (that.sym == null) {
5133 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5134 }
5135 super.visitMethodDef(that);
5136 }
5137
5138 @Override
5139 public void visitVarDef(JCVariableDecl that) {
5140 initTypeIfNeeded(that);
5141 if (that.sym == null) {
5142 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5143 that.sym.adr = 0;
5144 }
5145 if (that.vartype == null) {
5146 that.vartype = make.at(Position.NOPOS).Erroneous();
5147 }
5148 super.visitVarDef(that);
5149 }
5150
5151 @Override
5152 public void visitNewClass(JCNewClass that) {
5153 if (that.constructor == null) {
5154 that.constructor = new MethodSymbol(0, names.init,
5155 dummyMethodType(), syms.noSymbol);
5156 }
5157 if (that.constructorType == null) {
5158 that.constructorType = syms.unknownType;
5159 }
5160 super.visitNewClass(that);
5161 }
5162
5163 @Override
5164 public void visitAssignop(JCAssignOp that) {
5165 if (that.operator == null) {
5166 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5167 -1, syms.noSymbol);
5168 }
5169 super.visitAssignop(that);
5170 }
5171
5172 @Override
5173 public void visitBinary(JCBinary that) {
5174 if (that.operator == null) {
5175 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5176 -1, syms.noSymbol);
5177 }
5178 super.visitBinary(that);
5179 }
5180
5181 @Override
5182 public void visitUnary(JCUnary that) {
5183 if (that.operator == null) {
5184 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5185 -1, syms.noSymbol);
5186 }
5187 super.visitUnary(that);
5188 }
5189
5190 @Override
5191 public void visitLambda(JCLambda that) {
5192 super.visitLambda(that);
5193 if (that.targets == null) {
5194 that.targets = List.nil();
5195 }
5196 }
5197
5198 @Override
5199 public void visitReference(JCMemberReference that) {
5200 super.visitReference(that);
5201 if (that.sym == null) {
5202 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5203 syms.noSymbol);
5204 }
5205 if (that.targets == null) {
5206 that.targets = List.nil();
5207 }
5208 }
5209 }
5210 // </editor-fold>
5211
5212 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5213 new TreeScanner() {
5214 Symbol packge = pkg;
5215 @Override
5216 public void visitIdent(JCIdent that) {
5217 that.sym = packge;
5218 }
5219
5220 @Override
5221 public void visitSelect(JCFieldAccess that) {
5222 that.sym = packge;
5223 packge = packge.owner;
5224 super.visitSelect(that);
5225 }
5226 }.scan(pid);
5227 }
5228
5229 }