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 allowPoly = Feature.POLY.allowedInSource(source);
157 allowTypeAnnos = Feature.TYPE_ANNOTATIONS.allowedInSource(source);
158 allowLambda = Feature.LAMBDA.allowedInSource(source);
159 allowDefaultMethods = Feature.DEFAULT_METHODS.allowedInSource(source);
160 allowStaticInterfaceMethods = Feature.STATIC_INTERFACE_METHODS.allowedInSource(source);
161 sourceName = source.name;
162 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
163
164 statInfo = new ResultInfo(KindSelector.NIL, Type.noType);
165 varAssignmentInfo = new ResultInfo(KindSelector.ASG, Type.noType);
166 unknownExprInfo = new ResultInfo(KindSelector.VAL, Type.noType);
167 methodAttrInfo = new MethodAttrInfo();
168 unknownTypeInfo = new ResultInfo(KindSelector.TYP, Type.noType);
169 unknownTypeExprInfo = new ResultInfo(KindSelector.VAL_TYP, Type.noType);
170 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
171 }
172
173 /** Switch: support target-typing inference
174 */
175 boolean allowPoly;
176
177 /** Switch: support type annotations.
178 */
179 boolean allowTypeAnnos;
180
181 /** Switch: support lambda expressions ?
182 */
183 boolean allowLambda;
184
185 /** Switch: support default methods ?
186 */
187 boolean allowDefaultMethods;
188
189 /** Switch: static interface methods enabled?
190 */
191 boolean allowStaticInterfaceMethods;
192
193 /**
194 * Switch: warn about use of variable before declaration?
195 * RFE: 6425594
196 */
197 boolean useBeforeDeclarationWarning;
198
199 /**
200 * Switch: name of source level; used for error reporting.
201 */
202 String sourceName;
203
204 /** Check kind and type of given tree against protokind and prototype.
205 * If check succeeds, store type in tree and return it.
206 * If check fails, store errType in tree and return it.
207 * No checks are performed if the prototype is a method type.
208 * It is not necessary in this case since we know that kind and type
209 * are correct.
210 *
211 * @param tree The tree whose kind and type is checked
212 * @param found The computed type of the tree
213 * @param ownkind The computed kind of the tree
214 * @param resultInfo The expected result of the tree
215 */
216 Type check(final JCTree tree,
217 final Type found,
218 final KindSelector ownkind,
219 final ResultInfo resultInfo) {
220 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
221 Type owntype;
222 boolean shouldCheck = !found.hasTag(ERROR) &&
223 !resultInfo.pt.hasTag(METHOD) &&
224 !resultInfo.pt.hasTag(FORALL);
225 if (shouldCheck && !ownkind.subset(resultInfo.pkind)) {
226 log.error(tree.pos(),
227 Errors.UnexpectedType(resultInfo.pkind.kindNames(),
228 ownkind.kindNames()));
229 owntype = types.createErrorType(found);
230 } else if (allowPoly && inferenceContext.free(found)) {
231 //delay the check if there are inference variables in the found type
232 //this means we are dealing with a partially inferred poly expression
233 owntype = shouldCheck ? resultInfo.pt : found;
234 if (resultInfo.checkMode.installPostInferenceHook()) {
235 inferenceContext.addFreeTypeListener(List.of(found),
236 instantiatedContext -> {
237 ResultInfo pendingResult =
238 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
239 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
240 });
241 }
242 } else {
243 owntype = shouldCheck ?
244 resultInfo.check(tree, found) :
245 found;
246 }
247 if (resultInfo.checkMode.updateTreeType()) {
248 tree.type = owntype;
249 }
250 return owntype;
251 }
252
253 /** Is given blank final variable assignable, i.e. in a scope where it
254 * may be assigned to even though it is final?
255 * @param v The blank final variable.
256 * @param env The current environment.
257 */
258 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
259 Symbol owner = env.info.scope.owner;
260 // owner refers to the innermost variable, method or
261 // initializer block declaration at this point.
262 return
263 v.owner == owner
264 ||
265 ((owner.name == names.init || // i.e. we are in a constructor
266 owner.kind == VAR || // i.e. we are in a variable initializer
267 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
268 &&
269 v.owner == owner.owner
270 &&
271 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
272 }
273
274 /** Check that variable can be assigned to.
275 * @param pos The current source code position.
276 * @param v The assigned variable
277 * @param base If the variable is referred to in a Select, the part
278 * to the left of the `.', null otherwise.
279 * @param env The current environment.
280 */
281 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
282 if (v.name == names._this) {
283 log.error(pos, Errors.CantAssignValToThis);
284 } else if ((v.flags() & FINAL) != 0 &&
285 ((v.flags() & HASINIT) != 0
286 ||
287 !((base == null ||
288 TreeInfo.isThisQualifier(base)) &&
289 isAssignableAsBlankFinal(v, env)))) {
290 if (v.isResourceVariable()) { //TWR resource
291 log.error(pos, Errors.TryResourceMayNotBeAssigned(v));
292 } else {
293 log.error(pos, Errors.CantAssignValToFinalVar(v));
294 }
295 }
296 }
297
298 /** Does tree represent a static reference to an identifier?
299 * It is assumed that tree is either a SELECT or an IDENT.
300 * We have to weed out selects from non-type names here.
301 * @param tree The candidate tree.
302 */
303 boolean isStaticReference(JCTree tree) {
304 if (tree.hasTag(SELECT)) {
305 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
306 if (lsym == null || lsym.kind != TYP) {
307 return false;
308 }
309 }
310 return true;
311 }
312
313 /** Is this symbol a type?
314 */
315 static boolean isType(Symbol sym) {
316 return sym != null && sym.kind == TYP;
317 }
318
319 /** The current `this' symbol.
320 * @param env The current environment.
321 */
322 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
323 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
324 }
325
326 /** Attribute a parsed identifier.
327 * @param tree Parsed identifier name
328 * @param topLevel The toplevel to use
329 */
330 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
331 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
332 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
333 syms.errSymbol.name,
334 null, null, null, null);
335 localEnv.enclClass.sym = syms.errSymbol;
336 return attribIdent(tree, localEnv);
337 }
338
339 /** Attribute a parsed identifier.
340 * @param tree Parsed identifier name
341 * @param env The env to use
342 */
343 public Symbol attribIdent(JCTree tree, Env<AttrContext> env) {
344 return tree.accept(identAttributer, env);
345 }
346 // where
347 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
348 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
349 @Override @DefinedBy(Api.COMPILER_TREE)
350 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
351 Symbol site = visit(node.getExpression(), env);
352 if (site.kind == ERR || site.kind == ABSENT_TYP || site.kind == HIDDEN)
353 return site;
354 Name name = (Name)node.getIdentifier();
355 if (site.kind == PCK) {
356 env.toplevel.packge = (PackageSymbol)site;
357 return rs.findIdentInPackage(env, (TypeSymbol)site, name,
358 KindSelector.TYP_PCK);
359 } else {
360 env.enclClass.sym = (ClassSymbol)site;
361 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
362 }
363 }
364
365 @Override @DefinedBy(Api.COMPILER_TREE)
366 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
367 return rs.findIdent(env, (Name)node.getName(), KindSelector.TYP_PCK);
368 }
369 }
370
371 public Type coerce(Type etype, Type ttype) {
372 return cfolder.coerce(etype, ttype);
373 }
374
375 public Type attribType(JCTree node, TypeSymbol sym) {
376 Env<AttrContext> env = typeEnvs.get(sym);
377 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
378 return attribTree(node, localEnv, unknownTypeInfo);
379 }
380
381 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
382 // Attribute qualifying package or class.
383 JCFieldAccess s = (JCFieldAccess)tree.qualid;
384 return attribTree(s.selected, env,
385 new ResultInfo(tree.staticImport ?
386 KindSelector.TYP : KindSelector.TYP_PCK,
387 Type.noType));
388 }
389
390 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
391 breakTree = tree;
392 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
393 try {
394 attribExpr(expr, env);
395 } catch (BreakAttr b) {
396 return b.env;
397 } catch (AssertionError ae) {
398 if (ae.getCause() instanceof BreakAttr) {
399 return ((BreakAttr)(ae.getCause())).env;
400 } else {
401 throw ae;
402 }
403 } finally {
404 breakTree = null;
405 log.useSource(prev);
406 }
407 return env;
408 }
409
410 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
411 breakTree = tree;
412 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
413 try {
414 attribStat(stmt, env);
415 } catch (BreakAttr b) {
416 return b.env;
417 } catch (AssertionError ae) {
418 if (ae.getCause() instanceof BreakAttr) {
419 return ((BreakAttr)(ae.getCause())).env;
420 } else {
421 throw ae;
422 }
423 } finally {
424 breakTree = null;
425 log.useSource(prev);
426 }
427 return env;
428 }
429
430 private JCTree breakTree = null;
431
432 private static class BreakAttr extends RuntimeException {
433 static final long serialVersionUID = -6924771130405446405L;
434 private Env<AttrContext> env;
435 private BreakAttr(Env<AttrContext> env) {
436 this.env = env;
437 }
438 }
439
440 /**
441 * Mode controlling behavior of Attr.Check
442 */
443 enum CheckMode {
444
445 NORMAL,
446
447 /**
448 * Mode signalling 'fake check' - skip tree update. A side-effect of this mode is
449 * that the captured var cache in {@code InferenceContext} will be used in read-only
450 * mode when performing inference checks.
451 */
452 NO_TREE_UPDATE {
453 @Override
454 public boolean updateTreeType() {
455 return false;
456 }
457 },
458 /**
459 * Mode signalling that caller will manage free types in tree decorations.
460 */
461 NO_INFERENCE_HOOK {
462 @Override
463 public boolean installPostInferenceHook() {
464 return false;
465 }
466 };
467
468 public boolean updateTreeType() {
469 return true;
470 }
471 public boolean installPostInferenceHook() {
472 return true;
473 }
474 }
475
476
477 class ResultInfo {
478 final KindSelector pkind;
479 final Type pt;
480 final CheckContext checkContext;
481 final CheckMode checkMode;
482
483 ResultInfo(KindSelector pkind, Type pt) {
484 this(pkind, pt, chk.basicHandler, CheckMode.NORMAL);
485 }
486
487 ResultInfo(KindSelector pkind, Type pt, CheckMode checkMode) {
488 this(pkind, pt, chk.basicHandler, checkMode);
489 }
490
491 protected ResultInfo(KindSelector pkind,
492 Type pt, CheckContext checkContext) {
493 this(pkind, pt, checkContext, CheckMode.NORMAL);
494 }
495
496 protected ResultInfo(KindSelector pkind,
497 Type pt, CheckContext checkContext, CheckMode checkMode) {
498 this.pkind = pkind;
499 this.pt = pt;
500 this.checkContext = checkContext;
501 this.checkMode = checkMode;
502 }
503
504 /**
505 * Should {@link Attr#attribTree} use the {@ArgumentAttr} visitor instead of this one?
506 * @param tree The tree to be type-checked.
507 * @return true if {@ArgumentAttr} should be used.
508 */
509 protected boolean needsArgumentAttr(JCTree tree) { return false; }
510
511 protected Type check(final DiagnosticPosition pos, final Type found) {
512 return chk.checkType(pos, found, pt, checkContext);
513 }
514
515 protected ResultInfo dup(Type newPt) {
516 return new ResultInfo(pkind, newPt, checkContext, checkMode);
517 }
518
519 protected ResultInfo dup(CheckContext newContext) {
520 return new ResultInfo(pkind, pt, newContext, checkMode);
521 }
522
523 protected ResultInfo dup(Type newPt, CheckContext newContext) {
524 return new ResultInfo(pkind, newPt, newContext, checkMode);
525 }
526
527 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
528 return new ResultInfo(pkind, newPt, newContext, newMode);
529 }
530
531 protected ResultInfo dup(CheckMode newMode) {
532 return new ResultInfo(pkind, pt, checkContext, newMode);
533 }
534
535 @Override
536 public String toString() {
537 if (pt != null) {
538 return pt.toString();
539 } else {
540 return "";
541 }
542 }
543 }
544
545 class MethodAttrInfo extends ResultInfo {
546 public MethodAttrInfo() {
547 this(chk.basicHandler);
548 }
549
550 public MethodAttrInfo(CheckContext checkContext) {
551 super(KindSelector.VAL, Infer.anyPoly, checkContext);
552 }
553
554 @Override
555 protected boolean needsArgumentAttr(JCTree tree) {
556 return true;
557 }
558
559 protected ResultInfo dup(Type newPt) {
560 throw new IllegalStateException();
561 }
562
563 protected ResultInfo dup(CheckContext newContext) {
564 return new MethodAttrInfo(newContext);
565 }
566
567 protected ResultInfo dup(Type newPt, CheckContext newContext) {
568 throw new IllegalStateException();
569 }
570
571 protected ResultInfo dup(Type newPt, CheckContext newContext, CheckMode newMode) {
572 throw new IllegalStateException();
573 }
574
575 protected ResultInfo dup(CheckMode newMode) {
576 throw new IllegalStateException();
577 }
578 }
579
580 class RecoveryInfo extends ResultInfo {
581
582 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
583 this(deferredAttrContext, Type.recoveryType);
584 }
585
586 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext, Type pt) {
587 super(KindSelector.VAL, pt, new Check.NestedCheckContext(chk.basicHandler) {
588 @Override
589 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
590 return deferredAttrContext;
591 }
592 @Override
593 public boolean compatible(Type found, Type req, Warner warn) {
594 return true;
595 }
596 @Override
597 public void report(DiagnosticPosition pos, JCDiagnostic details) {
598 if (pt == Type.recoveryType) {
599 chk.basicHandler.report(pos, details);
600 }
601 }
602 });
603 }
604 }
605
606 final ResultInfo statInfo;
607 final ResultInfo varAssignmentInfo;
608 final ResultInfo methodAttrInfo;
609 final ResultInfo unknownExprInfo;
610 final ResultInfo unknownTypeInfo;
611 final ResultInfo unknownTypeExprInfo;
612 final ResultInfo recoveryInfo;
613
614 Type pt() {
615 return resultInfo.pt;
616 }
617
618 KindSelector pkind() {
619 return resultInfo.pkind;
620 }
621
622 /* ************************************************************************
623 * Visitor methods
624 *************************************************************************/
625
626 /** Visitor argument: the current environment.
627 */
628 Env<AttrContext> env;
629
630 /** Visitor argument: the currently expected attribution result.
631 */
632 ResultInfo resultInfo;
633
634 /** Visitor result: the computed type.
635 */
636 Type result;
637
638 /** Visitor method: attribute a tree, catching any completion failure
639 * exceptions. Return the tree's type.
640 *
641 * @param tree The tree to be visited.
642 * @param env The environment visitor argument.
643 * @param resultInfo The result info visitor argument.
644 */
645 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
646 Env<AttrContext> prevEnv = this.env;
647 ResultInfo prevResult = this.resultInfo;
648 try {
649 this.env = env;
650 this.resultInfo = resultInfo;
651 if (resultInfo.needsArgumentAttr(tree)) {
652 result = argumentAttr.attribArg(tree, env);
653 } else {
654 tree.accept(this);
655 }
656 if (tree == breakTree &&
657 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
658 breakTreeFound(copyEnv(env));
659 }
660 return result;
661 } catch (CompletionFailure ex) {
662 tree.type = syms.errType;
663 return chk.completionError(tree.pos(), ex);
664 } finally {
665 this.env = prevEnv;
666 this.resultInfo = prevResult;
667 }
668 }
669
670 protected void breakTreeFound(Env<AttrContext> env) {
671 throw new BreakAttr(env);
672 }
673
674 Env<AttrContext> copyEnv(Env<AttrContext> env) {
675 Env<AttrContext> newEnv =
676 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
677 if (newEnv.outer != null) {
678 newEnv.outer = copyEnv(newEnv.outer);
679 }
680 return newEnv;
681 }
682
683 WriteableScope copyScope(WriteableScope sc) {
684 WriteableScope newScope = WriteableScope.create(sc.owner);
685 List<Symbol> elemsList = List.nil();
686 for (Symbol sym : sc.getSymbols()) {
687 elemsList = elemsList.prepend(sym);
688 }
689 for (Symbol s : elemsList) {
690 newScope.enter(s);
691 }
692 return newScope;
693 }
694
695 /** Derived visitor method: attribute an expression tree.
696 */
697 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
698 return attribTree(tree, env, new ResultInfo(KindSelector.VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
699 }
700
701 /** Derived visitor method: attribute an expression tree with
702 * no constraints on the computed type.
703 */
704 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
705 return attribTree(tree, env, unknownExprInfo);
706 }
707
708 /** Derived visitor method: attribute a type tree.
709 */
710 public Type attribType(JCTree tree, Env<AttrContext> env) {
711 Type result = attribType(tree, env, Type.noType);
712 return result;
713 }
714
715 /** Derived visitor method: attribute a type tree.
716 */
717 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
718 Type result = attribTree(tree, env, new ResultInfo(KindSelector.TYP, pt));
719 return result;
720 }
721
722 /** Derived visitor method: attribute a statement or definition tree.
723 */
724 public Type attribStat(JCTree tree, Env<AttrContext> env) {
725 Env<AttrContext> analyzeEnv = analyzer.copyEnvIfNeeded(tree, env);
726 try {
727 return attribTree(tree, env, statInfo);
728 } finally {
729 analyzer.analyzeIfNeeded(tree, analyzeEnv);
730 }
731 }
732
733 /** Attribute a list of expressions, returning a list of types.
734 */
735 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
736 ListBuffer<Type> ts = new ListBuffer<>();
737 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
738 ts.append(attribExpr(l.head, env, pt));
739 return ts.toList();
740 }
741
742 /** Attribute a list of statements, returning nothing.
743 */
744 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
745 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
746 attribStat(l.head, env);
747 }
748
749 /** Attribute the arguments in a method call, returning the method kind.
750 */
751 KindSelector attribArgs(KindSelector initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
752 KindSelector kind = initialKind;
753 for (JCExpression arg : trees) {
754 Type argtype = chk.checkNonVoid(arg, attribTree(arg, env, allowPoly ? methodAttrInfo : unknownExprInfo));
755 if (argtype.hasTag(DEFERRED)) {
756 kind = KindSelector.of(KindSelector.POLY, kind);
757 }
758 argtypes.append(argtype);
759 }
760 return kind;
761 }
762
763 /** Attribute a type argument list, returning a list of types.
764 * Caller is responsible for calling checkRefTypes.
765 */
766 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
767 ListBuffer<Type> argtypes = new ListBuffer<>();
768 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
769 argtypes.append(attribType(l.head, env));
770 return argtypes.toList();
771 }
772
773 /** Attribute a type argument list, returning a list of types.
774 * Check that all the types are references.
775 */
776 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
777 List<Type> types = attribAnyTypes(trees, env);
778 return chk.checkRefTypes(trees, types);
779 }
780
781 /**
782 * Attribute type variables (of generic classes or methods).
783 * Compound types are attributed later in attribBounds.
784 * @param typarams the type variables to enter
785 * @param env the current environment
786 */
787 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
788 for (JCTypeParameter tvar : typarams) {
789 TypeVar a = (TypeVar)tvar.type;
790 a.tsym.flags_field |= UNATTRIBUTED;
791 a.bound = Type.noType;
792 if (!tvar.bounds.isEmpty()) {
793 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
794 for (JCExpression bound : tvar.bounds.tail)
795 bounds = bounds.prepend(attribType(bound, env));
796 types.setBounds(a, bounds.reverse());
797 } else {
798 // if no bounds are given, assume a single bound of
799 // java.lang.Object.
800 types.setBounds(a, List.of(syms.objectType));
801 }
802 a.tsym.flags_field &= ~UNATTRIBUTED;
803 }
804 for (JCTypeParameter tvar : typarams) {
805 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
806 }
807 }
808
809 /**
810 * Attribute the type references in a list of annotations.
811 */
812 void attribAnnotationTypes(List<JCAnnotation> annotations,
813 Env<AttrContext> env) {
814 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
815 JCAnnotation a = al.head;
816 attribType(a.annotationType, env);
817 }
818 }
819
820 /**
821 * Attribute a "lazy constant value".
822 * @param env The env for the const value
823 * @param variable The initializer for the const value
824 * @param type The expected type, or null
825 * @see VarSymbol#setLazyConstValue
826 */
827 public Object attribLazyConstantValue(Env<AttrContext> env,
828 JCVariableDecl variable,
829 Type type) {
830
831 DiagnosticPosition prevLintPos
832 = deferredLintHandler.setPos(variable.pos());
833
834 final JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
835 try {
836 Type itype = attribExpr(variable.init, env, type);
837 if (variable.isImplicitlyTyped()) {
838 //fixup local variable type
839 type = variable.type = variable.sym.type = chk.checkLocalVarType(variable, itype.baseType(), variable.name);
840 }
841 if (itype.constValue() != null) {
842 return coerce(itype, type).constValue();
843 } else {
844 return null;
845 }
846 } finally {
847 log.useSource(prevSource);
848 deferredLintHandler.setPos(prevLintPos);
849 }
850 }
851
852 /** Attribute type reference in an `extends' or `implements' clause.
853 * Supertypes of anonymous inner classes are usually already attributed.
854 *
855 * @param tree The tree making up the type reference.
856 * @param env The environment current at the reference.
857 * @param classExpected true if only a class is expected here.
858 * @param interfaceExpected true if only an interface is expected here.
859 */
860 Type attribBase(JCTree tree,
861 Env<AttrContext> env,
862 boolean classExpected,
863 boolean interfaceExpected,
864 boolean checkExtensible) {
865 Type t = tree.type != null ?
866 tree.type :
867 attribType(tree, env);
868 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
869 }
870 Type checkBase(Type t,
871 JCTree tree,
872 Env<AttrContext> env,
873 boolean classExpected,
874 boolean interfaceExpected,
875 boolean checkExtensible) {
876 final DiagnosticPosition pos = tree.hasTag(TYPEAPPLY) ?
877 (((JCTypeApply) tree).clazz).pos() : tree.pos();
878 if (t.tsym.isAnonymous()) {
879 log.error(pos, Errors.CantInheritFromAnon);
880 return types.createErrorType(t);
881 }
882 if (t.isErroneous())
883 return t;
884 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
885 // check that type variable is already visible
886 if (t.getUpperBound() == null) {
887 log.error(pos, Errors.IllegalForwardRef);
888 return types.createErrorType(t);
889 }
890 } else {
891 t = chk.checkClassType(pos, t, checkExtensible);
892 }
893 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
894 log.error(pos, Errors.IntfExpectedHere);
895 // return errType is necessary since otherwise there might
896 // be undetected cycles which cause attribution to loop
897 return types.createErrorType(t);
898 } else if (checkExtensible &&
899 classExpected &&
900 (t.tsym.flags() & INTERFACE) != 0) {
901 log.error(pos, Errors.NoIntfExpectedHere);
902 return types.createErrorType(t);
903 }
904 if (checkExtensible &&
905 ((t.tsym.flags() & FINAL) != 0)) {
906 log.error(pos,
907 Errors.CantInheritFromFinal(t.tsym));
908 }
909 chk.checkNonCyclic(pos, t);
910 return t;
911 }
912
913 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
914 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
915 id.type = env.info.scope.owner.enclClass().type;
916 id.sym = env.info.scope.owner.enclClass();
917 return id.type;
918 }
919
920 public void visitClassDef(JCClassDecl tree) {
921 Optional<ArgumentAttr.LocalCacheContext> localCacheContext =
922 Optional.ofNullable(env.info.isSpeculative ?
923 argumentAttr.withLocalCacheContext() : null);
924 try {
925 // Local and anonymous classes have not been entered yet, so we need to
926 // do it now.
927 if (env.info.scope.owner.kind.matches(KindSelector.VAL_MTH)) {
928 enter.classEnter(tree, env);
929 } else {
930 // If this class declaration is part of a class level annotation,
931 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
932 // order to simplify later steps and allow for sensible error
933 // messages.
934 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
935 enter.classEnter(tree, env);
936 }
937
938 ClassSymbol c = tree.sym;
939 if (c == null) {
940 // exit in case something drastic went wrong during enter.
941 result = null;
942 } else {
943 // make sure class has been completed:
944 c.complete();
945
946 // If this class appears as an anonymous class
947 // in a superclass constructor call
948 // disable implicit outer instance from being passed.
949 // (This would be an illegal access to "this before super").
950 if (env.info.isSelfCall &&
951 env.tree.hasTag(NEWCLASS)) {
952 c.flags_field |= NOOUTERTHIS;
953 }
954 attribClass(tree.pos(), c);
955 result = tree.type = c.type;
956 }
957 } finally {
958 localCacheContext.ifPresent(LocalCacheContext::leave);
959 }
960 }
961
962 public void visitMethodDef(JCMethodDecl tree) {
963 MethodSymbol m = tree.sym;
964 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
965
966 Lint lint = env.info.lint.augment(m);
967 Lint prevLint = chk.setLint(lint);
968 MethodSymbol prevMethod = chk.setMethod(m);
969 try {
970 deferredLintHandler.flush(tree.pos());
971 chk.checkDeprecatedAnnotation(tree.pos(), m);
972
973
974 // Create a new environment with local scope
975 // for attributing the method.
976 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
977 localEnv.info.lint = lint;
978
979 attribStats(tree.typarams, localEnv);
980
981 // If we override any other methods, check that we do so properly.
982 // JLS ???
983 if (m.isStatic()) {
984 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
985 } else {
986 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
987 }
988 chk.checkOverride(env, tree, m);
989
990 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
991 log.error(tree, Errors.DefaultOverridesObjectMember(m.name, Kinds.kindName(m.location()), m.location()));
992 }
993
994 // Enter all type parameters into the local method scope.
995 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
996 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
997
998 ClassSymbol owner = env.enclClass.sym;
999 if ((owner.flags() & ANNOTATION) != 0 &&
1000 (tree.params.nonEmpty() ||
1001 tree.recvparam != null))
1002 log.error(tree.params.nonEmpty() ?
1003 tree.params.head.pos() :
1004 tree.recvparam.pos(),
1005 Errors.IntfAnnotationMembersCantHaveParams);
1006
1007 // Attribute all value parameters.
1008 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
1009 attribStat(l.head, localEnv);
1010 }
1011
1012 chk.checkVarargsMethodDecl(localEnv, tree);
1013
1014 // Check that type parameters are well-formed.
1015 chk.validate(tree.typarams, localEnv);
1016
1017 // Check that result type is well-formed.
1018 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
1019 chk.validate(tree.restype, localEnv);
1020
1021 // Check that receiver type is well-formed.
1022 if (tree.recvparam != null) {
1023 // Use a new environment to check the receiver parameter.
1024 // Otherwise I get "might not have been initialized" errors.
1025 // Is there a better way?
1026 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
1027 attribType(tree.recvparam, newEnv);
1028 chk.validate(tree.recvparam, newEnv);
1029 }
1030
1031 // annotation method checks
1032 if ((owner.flags() & ANNOTATION) != 0) {
1033 // annotation method cannot have throws clause
1034 if (tree.thrown.nonEmpty()) {
1035 log.error(tree.thrown.head.pos(),
1036 Errors.ThrowsNotAllowedInIntfAnnotation);
1037 }
1038 // annotation method cannot declare type-parameters
1039 if (tree.typarams.nonEmpty()) {
1040 log.error(tree.typarams.head.pos(),
1041 Errors.IntfAnnotationMembersCantHaveTypeParams);
1042 }
1043 // validate annotation method's return type (could be an annotation type)
1044 chk.validateAnnotationType(tree.restype);
1045 // ensure that annotation method does not clash with members of Object/Annotation
1046 chk.validateAnnotationMethod(tree.pos(), m);
1047 }
1048
1049 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
1050 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
1051
1052 if (tree.body == null) {
1053 // Empty bodies are only allowed for
1054 // abstract, native, or interface methods, or for methods
1055 // in a retrofit signature class.
1056 if (tree.defaultValue != null) {
1057 if ((owner.flags() & ANNOTATION) == 0)
1058 log.error(tree.pos(),
1059 Errors.DefaultAllowedInIntfAnnotationMember);
1060 }
1061 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0)
1062 log.error(tree.pos(), Errors.MissingMethBodyOrDeclAbstract);
1063 } else if ((tree.sym.flags() & (ABSTRACT|DEFAULT|PRIVATE)) == ABSTRACT) {
1064 if ((owner.flags() & INTERFACE) != 0) {
1065 log.error(tree.body.pos(), Errors.IntfMethCantHaveBody);
1066 } else {
1067 log.error(tree.pos(), Errors.AbstractMethCantHaveBody);
1068 }
1069 } else if ((tree.mods.flags & NATIVE) != 0) {
1070 log.error(tree.pos(), Errors.NativeMethCantHaveBody);
1071 } else {
1072 // Add an implicit super() call unless an explicit call to
1073 // super(...) or this(...) is given
1074 // or we are compiling class java.lang.Object.
1075 if (tree.name == names.init && owner.type != syms.objectType) {
1076 JCBlock body = tree.body;
1077 if (body.stats.isEmpty() ||
1078 !TreeInfo.isSelfCall(body.stats.head)) {
1079 body.stats = body.stats.
1080 prepend(typeEnter.SuperCall(make.at(body.pos),
1081 List.nil(),
1082 List.nil(),
1083 false));
1084 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1085 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1086 TreeInfo.isSuperCall(body.stats.head)) {
1087 // enum constructors are not allowed to call super
1088 // directly, so make sure there aren't any super calls
1089 // in enum constructors, except in the compiler
1090 // generated one.
1091 log.error(tree.body.stats.head.pos(),
1092 Errors.CallToSuperNotAllowedInEnumCtor(env.enclClass.sym));
1093 }
1094 }
1095
1096 // Attribute all type annotations in the body
1097 annotate.queueScanTreeAndTypeAnnotate(tree.body, localEnv, m, null);
1098 annotate.flush();
1099
1100 // Attribute method body.
1101 attribStat(tree.body, localEnv);
1102 }
1103
1104 localEnv.info.scope.leave();
1105 result = tree.type = m.type;
1106 } finally {
1107 chk.setLint(prevLint);
1108 chk.setMethod(prevMethod);
1109 }
1110 }
1111
1112 public void visitVarDef(JCVariableDecl tree) {
1113 // Local variables have not been entered yet, so we need to do it now:
1114 if (env.info.scope.owner.kind == MTH) {
1115 if (tree.sym != null) {
1116 // parameters have already been entered
1117 env.info.scope.enter(tree.sym);
1118 } else {
1119 if (tree.isImplicitlyTyped() && (tree.getModifiers().flags & PARAMETER) == 0) {
1120 if (tree.init == null) {
1121 //cannot use 'var' without initializer
1122 log.error(tree, Errors.CantInferLocalVarType(tree.name, Fragments.LocalMissingInit));
1123 tree.vartype = make.Erroneous();
1124 } else {
1125 Fragment msg = canInferLocalVarType(tree);
1126 if (msg != null) {
1127 //cannot use 'var' with initializer which require an explicit target
1128 //(e.g. lambda, method reference, array initializer).
1129 log.error(tree, Errors.CantInferLocalVarType(tree.name, msg));
1130 tree.vartype = make.Erroneous();
1131 }
1132 }
1133 }
1134 try {
1135 annotate.blockAnnotations();
1136 memberEnter.memberEnter(tree, env);
1137 } finally {
1138 annotate.unblockAnnotations();
1139 }
1140 }
1141 } else {
1142 if (tree.init != null) {
1143 // Field initializer expression need to be entered.
1144 annotate.queueScanTreeAndTypeAnnotate(tree.init, env, tree.sym, tree.pos());
1145 annotate.flush();
1146 }
1147 }
1148
1149 VarSymbol v = tree.sym;
1150 Lint lint = env.info.lint.augment(v);
1151 Lint prevLint = chk.setLint(lint);
1152
1153 // Check that the variable's declared type is well-formed.
1154 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1155 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1156 (tree.sym.flags() & PARAMETER) != 0;
1157 chk.validate(tree.vartype, env, !isImplicitLambdaParameter && !tree.isImplicitlyTyped());
1158
1159 try {
1160 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1161 deferredLintHandler.flush(tree.pos());
1162 chk.checkDeprecatedAnnotation(tree.pos(), v);
1163
1164 if (tree.init != null) {
1165 if ((v.flags_field & FINAL) == 0 ||
1166 !memberEnter.needsLazyConstValue(tree.init)) {
1167 // Not a compile-time constant
1168 // Attribute initializer in a new environment
1169 // with the declared variable as owner.
1170 // Check that initializer conforms to variable's declared type.
1171 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1172 initEnv.info.lint = lint;
1173 // In order to catch self-references, we set the variable's
1174 // declaration position to maximal possible value, effectively
1175 // marking the variable as undefined.
1176 initEnv.info.enclVar = v;
1177 attribExpr(tree.init, initEnv, v.type);
1178 if (tree.isImplicitlyTyped()) {
1179 //fixup local variable type
1180 v.type = chk.checkLocalVarType(tree, tree.init.type.baseType(), tree.name);
1181 }
1182 }
1183 if (tree.isImplicitlyTyped()) {
1184 setSyntheticVariableType(tree, v.type);
1185 }
1186 }
1187 result = tree.type = v.type;
1188 }
1189 finally {
1190 chk.setLint(prevLint);
1191 }
1192 }
1193
1194 Fragment canInferLocalVarType(JCVariableDecl tree) {
1195 LocalInitScanner lis = new LocalInitScanner();
1196 lis.scan(tree.init);
1197 return lis.badInferenceMsg;
1198 }
1199
1200 static class LocalInitScanner extends TreeScanner {
1201 Fragment badInferenceMsg = null;
1202 boolean needsTarget = true;
1203
1204 @Override
1205 public void visitNewArray(JCNewArray tree) {
1206 if (tree.elemtype == null && needsTarget) {
1207 badInferenceMsg = Fragments.LocalArrayMissingTarget;
1208 }
1209 }
1210
1211 @Override
1212 public void visitLambda(JCLambda tree) {
1213 if (needsTarget) {
1214 badInferenceMsg = Fragments.LocalLambdaMissingTarget;
1215 }
1216 }
1217
1218 @Override
1219 public void visitTypeCast(JCTypeCast tree) {
1220 boolean prevNeedsTarget = needsTarget;
1221 try {
1222 needsTarget = false;
1223 super.visitTypeCast(tree);
1224 } finally {
1225 needsTarget = prevNeedsTarget;
1226 }
1227 }
1228
1229 @Override
1230 public void visitReference(JCMemberReference tree) {
1231 if (needsTarget) {
1232 badInferenceMsg = Fragments.LocalMrefMissingTarget;
1233 }
1234 }
1235
1236 @Override
1237 public void visitNewClass(JCNewClass tree) {
1238 boolean prevNeedsTarget = needsTarget;
1239 try {
1240 needsTarget = false;
1241 super.visitNewClass(tree);
1242 } finally {
1243 needsTarget = prevNeedsTarget;
1244 }
1245 }
1246
1247 @Override
1248 public void visitApply(JCMethodInvocation tree) {
1249 boolean prevNeedsTarget = needsTarget;
1250 try {
1251 needsTarget = false;
1252 super.visitApply(tree);
1253 } finally {
1254 needsTarget = prevNeedsTarget;
1255 }
1256 }
1257 }
1258
1259 public void visitSkip(JCSkip tree) {
1260 result = null;
1261 }
1262
1263 public void visitBlock(JCBlock tree) {
1264 if (env.info.scope.owner.kind == TYP) {
1265 // Block is a static or instance initializer;
1266 // let the owner of the environment be a freshly
1267 // created BLOCK-method.
1268 Symbol fakeOwner =
1269 new MethodSymbol(tree.flags | BLOCK |
1270 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1271 env.info.scope.owner);
1272 final Env<AttrContext> localEnv =
1273 env.dup(tree, env.info.dup(env.info.scope.dupUnshared(fakeOwner)));
1274
1275 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1276 // Attribute all type annotations in the block
1277 annotate.queueScanTreeAndTypeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1278 annotate.flush();
1279 attribStats(tree.stats, localEnv);
1280
1281 {
1282 // Store init and clinit type annotations with the ClassSymbol
1283 // to allow output in Gen.normalizeDefs.
1284 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1285 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1286 if ((tree.flags & STATIC) != 0) {
1287 cs.appendClassInitTypeAttributes(tas);
1288 } else {
1289 cs.appendInitTypeAttributes(tas);
1290 }
1291 }
1292 } else {
1293 // Create a new local environment with a local scope.
1294 Env<AttrContext> localEnv =
1295 env.dup(tree, env.info.dup(env.info.scope.dup()));
1296 try {
1297 attribStats(tree.stats, localEnv);
1298 } finally {
1299 localEnv.info.scope.leave();
1300 }
1301 }
1302 result = null;
1303 }
1304
1305 public void visitDoLoop(JCDoWhileLoop tree) {
1306 attribStat(tree.body, env.dup(tree));
1307 attribExpr(tree.cond, env, syms.booleanType);
1308 result = null;
1309 }
1310
1311 public void visitWhileLoop(JCWhileLoop tree) {
1312 attribExpr(tree.cond, env, syms.booleanType);
1313 attribStat(tree.body, env.dup(tree));
1314 result = null;
1315 }
1316
1317 public void visitForLoop(JCForLoop tree) {
1318 Env<AttrContext> loopEnv =
1319 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1320 try {
1321 attribStats(tree.init, loopEnv);
1322 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1323 loopEnv.tree = tree; // before, we were not in loop!
1324 attribStats(tree.step, loopEnv);
1325 attribStat(tree.body, loopEnv);
1326 result = null;
1327 }
1328 finally {
1329 loopEnv.info.scope.leave();
1330 }
1331 }
1332
1333 public void visitForeachLoop(JCEnhancedForLoop tree) {
1334 Env<AttrContext> loopEnv =
1335 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1336 try {
1337 //the Formal Parameter of a for-each loop is not in the scope when
1338 //attributing the for-each expression; we mimick this by attributing
1339 //the for-each expression first (against original scope).
1340 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1341 chk.checkNonVoid(tree.pos(), exprType);
1342 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1343 if (elemtype == null) {
1344 // or perhaps expr implements Iterable<T>?
1345 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1346 if (base == null) {
1347 log.error(tree.expr.pos(),
1348 Errors.ForeachNotApplicableToType(exprType,
1349 Fragments.TypeReqArrayOrIterable));
1350 elemtype = types.createErrorType(exprType);
1351 } else {
1352 List<Type> iterableParams = base.allparams();
1353 elemtype = iterableParams.isEmpty()
1354 ? syms.objectType
1355 : types.wildUpperBound(iterableParams.head);
1356 }
1357 }
1358 if (tree.var.isImplicitlyTyped()) {
1359 Type inferredType = chk.checkLocalVarType(tree.var, elemtype, tree.var.name);
1360 setSyntheticVariableType(tree.var, inferredType);
1361 }
1362 attribStat(tree.var, loopEnv);
1363 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1364 loopEnv.tree = tree; // before, we were not in loop!
1365 attribStat(tree.body, loopEnv);
1366 result = null;
1367 }
1368 finally {
1369 loopEnv.info.scope.leave();
1370 }
1371 }
1372
1373 public void visitLabelled(JCLabeledStatement tree) {
1374 // Check that label is not used in an enclosing statement
1375 Env<AttrContext> env1 = env;
1376 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1377 if (env1.tree.hasTag(LABELLED) &&
1378 ((JCLabeledStatement) env1.tree).label == tree.label) {
1379 log.error(tree.pos(),
1380 Errors.LabelAlreadyInUse(tree.label));
1381 break;
1382 }
1383 env1 = env1.next;
1384 }
1385
1386 attribStat(tree.body, env.dup(tree));
1387 result = null;
1388 }
1389
1390 public void visitSwitch(JCSwitch tree) {
1391 Type seltype = attribExpr(tree.selector, env);
1392
1393 Env<AttrContext> switchEnv =
1394 env.dup(tree, env.info.dup(env.info.scope.dup()));
1395
1396 try {
1397
1398 boolean enumSwitch = (seltype.tsym.flags() & Flags.ENUM) != 0;
1399 boolean stringSwitch = types.isSameType(seltype, syms.stringType);
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 resultInfo = recoveryInfo;
2510 }
2511 //create an environment for attribution of the lambda expression
2512 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2513 boolean needsRecovery =
2514 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2515 try {
2516 if (needsRecovery && isSerializable(pt())) {
2517 localEnv.info.isSerializable = true;
2518 localEnv.info.isLambda = true;
2519 }
2520 List<Type> explicitParamTypes = null;
2521 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2522 //attribute lambda parameters
2523 attribStats(that.params, localEnv);
2524 explicitParamTypes = TreeInfo.types(that.params);
2525 }
2526
2527 TargetInfo targetInfo = getTargetInfo(that, resultInfo, explicitParamTypes);
2528 Type currentTarget = targetInfo.target;
2529 Type lambdaType = targetInfo.descriptor;
2530
2531 if (currentTarget.isErroneous()) {
2532 result = that.type = currentTarget;
2533 return;
2534 }
2535
2536 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2537
2538 if (lambdaType.hasTag(FORALL)) {
2539 //lambda expression target desc cannot be a generic method
2540 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
2541 kindName(currentTarget.tsym),
2542 currentTarget.tsym);
2543 resultInfo.checkContext.report(that, diags.fragment(msg));
2544 result = that.type = types.createErrorType(pt());
2545 return;
2546 }
2547
2548 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2549 //add param type info in the AST
2550 List<Type> actuals = lambdaType.getParameterTypes();
2551 List<JCVariableDecl> params = that.params;
2552
2553 boolean arityMismatch = false;
2554
2555 while (params.nonEmpty()) {
2556 if (actuals.isEmpty()) {
2557 //not enough actuals to perform lambda parameter inference
2558 arityMismatch = true;
2559 }
2560 //reset previously set info
2561 Type argType = arityMismatch ?
2562 syms.errType :
2563 actuals.head;
2564 if (params.head.isImplicitlyTyped()) {
2565 setSyntheticVariableType(params.head, argType);
2566 }
2567 params.head.sym = null;
2568 actuals = actuals.isEmpty() ?
2569 actuals :
2570 actuals.tail;
2571 params = params.tail;
2572 }
2573
2574 //attribute lambda parameters
2575 attribStats(that.params, localEnv);
2576
2577 if (arityMismatch) {
2578 resultInfo.checkContext.report(that, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
2579 result = that.type = types.createErrorType(currentTarget);
2580 return;
2581 }
2582 }
2583
2584 //from this point on, no recovery is needed; if we are in assignment context
2585 //we will be able to attribute the whole lambda body, regardless of errors;
2586 //if we are in a 'check' method context, and the lambda is not compatible
2587 //with the target-type, it will be recovered anyway in Attr.checkId
2588 needsRecovery = false;
2589
2590 ResultInfo bodyResultInfo = localEnv.info.returnResult =
2591 lambdaBodyResult(that, lambdaType, resultInfo);
2592
2593 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2594 attribTree(that.getBody(), localEnv, bodyResultInfo);
2595 } else {
2596 JCBlock body = (JCBlock)that.body;
2597 if (body == breakTree &&
2598 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2599 breakTreeFound(copyEnv(localEnv));
2600 }
2601 attribStats(body.stats, localEnv);
2602 }
2603
2604 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
2605
2606 boolean isSpeculativeRound =
2607 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2608
2609 preFlow(that);
2610 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2611
2612 that.type = currentTarget; //avoids recovery at this stage
2613 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2614
2615 if (!isSpeculativeRound) {
2616 //add thrown types as bounds to the thrown types free variables if needed:
2617 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2618 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2619 if(!checkExConstraints(inferredThrownTypes, lambdaType.getThrownTypes(), resultInfo.checkContext.inferenceContext())) {
2620 log.error(that, Errors.IncompatibleThrownTypesInMref(lambdaType.getThrownTypes()));
2621 }
2622 }
2623
2624 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2625 }
2626 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
2627 } catch (Types.FunctionDescriptorLookupError ex) {
2628 JCDiagnostic cause = ex.getDiagnostic();
2629 resultInfo.checkContext.report(that, cause);
2630 result = that.type = types.createErrorType(pt());
2631 return;
2632 } catch (Throwable t) {
2633 //when an unexpected exception happens, avoid attempts to attribute the same tree again
2634 //as that would likely cause the same exception again.
2635 needsRecovery = false;
2636 throw t;
2637 } finally {
2638 localEnv.info.scope.leave();
2639 if (needsRecovery) {
2640 attribTree(that, env, recoveryInfo);
2641 }
2642 }
2643 }
2644 //where
2645 class TargetInfo {
2646 Type target;
2647 Type descriptor;
2648
2649 public TargetInfo(Type target, Type descriptor) {
2650 this.target = target;
2651 this.descriptor = descriptor;
2652 }
2653 }
2654
2655 TargetInfo getTargetInfo(JCPolyExpression that, ResultInfo resultInfo, List<Type> explicitParamTypes) {
2656 Type lambdaType;
2657 Type currentTarget = resultInfo.pt;
2658 if (resultInfo.pt != Type.recoveryType) {
2659 /* We need to adjust the target. If the target is an
2660 * intersection type, for example: SAM & I1 & I2 ...
2661 * the target will be updated to SAM
2662 */
2663 currentTarget = targetChecker.visit(currentTarget, that);
2664 if (!currentTarget.isIntersection()) {
2665 if (explicitParamTypes != null) {
2666 currentTarget = infer.instantiateFunctionalInterface(that,
2667 currentTarget, explicitParamTypes, resultInfo.checkContext);
2668 }
2669 currentTarget = types.removeWildcards(currentTarget);
2670 lambdaType = types.findDescriptorType(currentTarget);
2671 } else {
2672 IntersectionClassType ict = (IntersectionClassType)currentTarget;
2673 ListBuffer<Type> components = new ListBuffer<>();
2674 for (Type bound : ict.getExplicitComponents()) {
2675 if (explicitParamTypes != null) {
2676 try {
2677 bound = infer.instantiateFunctionalInterface(that,
2678 bound, explicitParamTypes, resultInfo.checkContext);
2679 } catch (FunctionDescriptorLookupError t) {
2680 // do nothing
2681 }
2682 }
2683 bound = types.removeWildcards(bound);
2684 components.add(bound);
2685 }
2686 currentTarget = types.makeIntersectionType(components.toList());
2687 currentTarget.tsym.flags_field |= INTERFACE;
2688 lambdaType = types.findDescriptorType(currentTarget);
2689 }
2690
2691 } else {
2692 currentTarget = Type.recoveryType;
2693 lambdaType = fallbackDescriptorType(that);
2694 }
2695 if (that.hasTag(LAMBDA) && lambdaType.hasTag(FORALL)) {
2696 //lambda expression target desc cannot be a generic method
2697 Fragment msg = Fragments.InvalidGenericLambdaTarget(lambdaType,
2698 kindName(currentTarget.tsym),
2699 currentTarget.tsym);
2700 resultInfo.checkContext.report(that, diags.fragment(msg));
2701 currentTarget = types.createErrorType(pt());
2702 }
2703 return new TargetInfo(currentTarget, lambdaType);
2704 }
2705
2706 void preFlow(JCLambda tree) {
2707 new PostAttrAnalyzer() {
2708 @Override
2709 public void scan(JCTree tree) {
2710 if (tree == null ||
2711 (tree.type != null &&
2712 tree.type == Type.stuckType)) {
2713 //don't touch stuck expressions!
2714 return;
2715 }
2716 super.scan(tree);
2717 }
2718 }.scan(tree);
2719 }
2720
2721 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2722
2723 @Override
2724 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2725 return t.isIntersection() ?
2726 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2727 }
2728
2729 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2730 types.findDescriptorSymbol(makeNotionalInterface(ict, pos));
2731 return ict;
2732 }
2733
2734 private TypeSymbol makeNotionalInterface(IntersectionClassType ict, DiagnosticPosition pos) {
2735 ListBuffer<Type> targs = new ListBuffer<>();
2736 ListBuffer<Type> supertypes = new ListBuffer<>();
2737 for (Type i : ict.interfaces_field) {
2738 if (i.isParameterized()) {
2739 targs.appendList(i.tsym.type.allparams());
2740 }
2741 supertypes.append(i.tsym.type);
2742 }
2743 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
2744 notionalIntf.allparams_field = targs.toList();
2745 notionalIntf.tsym.flags_field |= INTERFACE;
2746 return notionalIntf.tsym;
2747 }
2748 };
2749
2750 private Type fallbackDescriptorType(JCExpression tree) {
2751 switch (tree.getTag()) {
2752 case LAMBDA:
2753 JCLambda lambda = (JCLambda)tree;
2754 List<Type> argtypes = List.nil();
2755 for (JCVariableDecl param : lambda.params) {
2756 argtypes = param.vartype != null ?
2757 argtypes.append(param.vartype.type) :
2758 argtypes.append(syms.errType);
2759 }
2760 return new MethodType(argtypes, Type.recoveryType,
2761 List.of(syms.throwableType), syms.methodClass);
2762 case REFERENCE:
2763 return new MethodType(List.nil(), Type.recoveryType,
2764 List.of(syms.throwableType), syms.methodClass);
2765 default:
2766 Assert.error("Cannot get here!");
2767 }
2768 return null;
2769 }
2770
2771 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2772 final InferenceContext inferenceContext, final Type... ts) {
2773 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2774 }
2775
2776 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2777 final InferenceContext inferenceContext, final List<Type> ts) {
2778 if (inferenceContext.free(ts)) {
2779 inferenceContext.addFreeTypeListener(ts,
2780 solvedContext -> checkAccessibleTypes(pos, env, solvedContext, solvedContext.asInstTypes(ts)));
2781 } else {
2782 for (Type t : ts) {
2783 rs.checkAccessibleType(env, t);
2784 }
2785 }
2786 }
2787
2788 /**
2789 * Lambda/method reference have a special check context that ensures
2790 * that i.e. a lambda return type is compatible with the expected
2791 * type according to both the inherited context and the assignment
2792 * context.
2793 */
2794 class FunctionalReturnContext extends Check.NestedCheckContext {
2795
2796 FunctionalReturnContext(CheckContext enclosingContext) {
2797 super(enclosingContext);
2798 }
2799
2800 @Override
2801 public boolean compatible(Type found, Type req, Warner warn) {
2802 //return type must be compatible in both current context and assignment context
2803 return chk.basicHandler.compatible(inferenceContext().asUndetVar(found), inferenceContext().asUndetVar(req), warn);
2804 }
2805
2806 @Override
2807 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2808 enclosingContext.report(pos, diags.fragment(Fragments.IncompatibleRetTypeInLambda(details)));
2809 }
2810 }
2811
2812 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2813
2814 JCExpression expr;
2815 boolean expStmtExpected;
2816
2817 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2818 super(enclosingContext);
2819 this.expr = expr;
2820 }
2821
2822 @Override
2823 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2824 if (expStmtExpected) {
2825 enclosingContext.report(pos, diags.fragment(Fragments.StatExprExpected));
2826 } else {
2827 super.report(pos, details);
2828 }
2829 }
2830
2831 @Override
2832 public boolean compatible(Type found, Type req, Warner warn) {
2833 //a void return is compatible with an expression statement lambda
2834 if (req.hasTag(VOID)) {
2835 expStmtExpected = true;
2836 return TreeInfo.isExpressionStatement(expr);
2837 } else {
2838 return super.compatible(found, req, warn);
2839 }
2840 }
2841 }
2842
2843 ResultInfo lambdaBodyResult(JCLambda that, Type descriptor, ResultInfo resultInfo) {
2844 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2845 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2846 new FunctionalReturnContext(resultInfo.checkContext);
2847
2848 return descriptor.getReturnType() == Type.recoveryType ?
2849 recoveryInfo :
2850 new ResultInfo(KindSelector.VAL,
2851 descriptor.getReturnType(), funcContext);
2852 }
2853
2854 /**
2855 * Lambda compatibility. Check that given return types, thrown types, parameter types
2856 * are compatible with the expected functional interface descriptor. This means that:
2857 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2858 * types must be compatible with the return type of the expected descriptor.
2859 */
2860 void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2861 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2862
2863 //return values have already been checked - but if lambda has no return
2864 //values, we must ensure that void/value compatibility is correct;
2865 //this amounts at checking that, if a lambda body can complete normally,
2866 //the descriptor's return type must be void
2867 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2868 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2869 Fragment msg =
2870 Fragments.IncompatibleRetTypeInLambda(Fragments.MissingRetVal(returnType));
2871 checkContext.report(tree,
2872 diags.fragment(msg));
2873 }
2874
2875 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2876 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2877 checkContext.report(tree, diags.fragment(Fragments.IncompatibleArgTypesInLambda));
2878 }
2879 }
2880
2881 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2882 * static field and that lambda has type annotations, these annotations will
2883 * also be stored at these fake clinit methods.
2884 *
2885 * LambdaToMethod also use fake clinit methods so they can be reused.
2886 * Also as LTM is a phase subsequent to attribution, the methods from
2887 * clinits can be safely removed by LTM to save memory.
2888 */
2889 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2890
2891 public MethodSymbol removeClinit(ClassSymbol sym) {
2892 return clinits.remove(sym);
2893 }
2894
2895 /* This method returns an environment to be used to attribute a lambda
2896 * expression.
2897 *
2898 * The owner of this environment is a method symbol. If the current owner
2899 * is not a method, for example if the lambda is used to initialize
2900 * a field, then if the field is:
2901 *
2902 * - an instance field, we use the first constructor.
2903 * - a static field, we create a fake clinit method.
2904 */
2905 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2906 Env<AttrContext> lambdaEnv;
2907 Symbol owner = env.info.scope.owner;
2908 if (owner.kind == VAR && owner.owner.kind == TYP) {
2909 //field initializer
2910 ClassSymbol enclClass = owner.enclClass();
2911 Symbol newScopeOwner = env.info.scope.owner;
2912 /* if the field isn't static, then we can get the first constructor
2913 * and use it as the owner of the environment. This is what
2914 * LTM code is doing to look for type annotations so we are fine.
2915 */
2916 if ((owner.flags() & STATIC) == 0) {
2917 for (Symbol s : enclClass.members_field.getSymbolsByName(names.init)) {
2918 newScopeOwner = s;
2919 break;
2920 }
2921 } else {
2922 /* if the field is static then we need to create a fake clinit
2923 * method, this method can later be reused by LTM.
2924 */
2925 MethodSymbol clinit = clinits.get(enclClass);
2926 if (clinit == null) {
2927 Type clinitType = new MethodType(List.nil(),
2928 syms.voidType, List.nil(), syms.methodClass);
2929 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2930 names.clinit, clinitType, enclClass);
2931 clinit.params = List.nil();
2932 clinits.put(enclClass, clinit);
2933 }
2934 newScopeOwner = clinit;
2935 }
2936 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared(newScopeOwner)));
2937 } else {
2938 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2939 }
2940 return lambdaEnv;
2941 }
2942
2943 @Override
2944 public void visitReference(final JCMemberReference that) {
2945 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2946 if (pt().hasTag(NONE) && (env.info.enclVar == null || !env.info.enclVar.type.isErroneous())) {
2947 //method reference only allowed in assignment or method invocation/cast context
2948 log.error(that.pos(), Errors.UnexpectedMref);
2949 }
2950 result = that.type = types.createErrorType(pt());
2951 return;
2952 }
2953 final Env<AttrContext> localEnv = env.dup(that);
2954 try {
2955 //attribute member reference qualifier - if this is a constructor
2956 //reference, the expected kind must be a type
2957 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2958
2959 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2960 exprType = chk.checkConstructorRefType(that.expr, exprType);
2961 if (!exprType.isErroneous() &&
2962 exprType.isRaw() &&
2963 that.typeargs != null) {
2964 log.error(that.expr.pos(),
2965 Errors.InvalidMref(Kinds.kindName(that.getMode()),
2966 Fragments.MrefInferAndExplicitParams));
2967 exprType = types.createErrorType(exprType);
2968 }
2969 }
2970
2971 if (exprType.isErroneous()) {
2972 //if the qualifier expression contains problems,
2973 //give up attribution of method reference
2974 result = that.type = exprType;
2975 return;
2976 }
2977
2978 if (TreeInfo.isStaticSelector(that.expr, names)) {
2979 //if the qualifier is a type, validate it; raw warning check is
2980 //omitted as we don't know at this stage as to whether this is a
2981 //raw selector (because of inference)
2982 chk.validate(that.expr, env, false);
2983 } else {
2984 Symbol lhsSym = TreeInfo.symbol(that.expr);
2985 localEnv.info.selectSuper = lhsSym != null && lhsSym.name == names._super;
2986 }
2987 //attrib type-arguments
2988 List<Type> typeargtypes = List.nil();
2989 if (that.typeargs != null) {
2990 typeargtypes = attribTypes(that.typeargs, localEnv);
2991 }
2992
2993 boolean isTargetSerializable =
2994 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2995 isSerializable(pt());
2996 TargetInfo targetInfo = getTargetInfo(that, resultInfo, null);
2997 Type currentTarget = targetInfo.target;
2998 Type desc = targetInfo.descriptor;
2999
3000 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
3001 List<Type> argtypes = desc.getParameterTypes();
3002 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
3003
3004 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
3005 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
3006 }
3007
3008 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
3009 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
3010 try {
3011 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
3012 that.name, argtypes, typeargtypes, targetInfo.descriptor, referenceCheck,
3013 resultInfo.checkContext.inferenceContext(), rs.basicReferenceChooser);
3014 } finally {
3015 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
3016 }
3017
3018 Symbol refSym = refResult.fst;
3019 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
3020
3021 /** this switch will need to go away and be replaced by the new RESOLUTION_TARGET testing
3022 * JDK-8075541
3023 */
3024 if (refSym.kind != MTH) {
3025 boolean targetError;
3026 switch (refSym.kind) {
3027 case ABSENT_MTH:
3028 case MISSING_ENCL:
3029 targetError = false;
3030 break;
3031 case WRONG_MTH:
3032 case WRONG_MTHS:
3033 case AMBIGUOUS:
3034 case HIDDEN:
3035 case STATICERR:
3036 targetError = true;
3037 break;
3038 default:
3039 Assert.error("unexpected result kind " + refSym.kind);
3040 targetError = false;
3041 }
3042
3043 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol())
3044 .getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
3045 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
3046
3047 JCDiagnostic diag = diags.create(log.currentSource(), that,
3048 targetError ?
3049 Fragments.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag) :
3050 Errors.InvalidMref(Kinds.kindName(that.getMode()), detailsDiag));
3051
3052 if (targetError && currentTarget == Type.recoveryType) {
3053 //a target error doesn't make sense during recovery stage
3054 //as we don't know what actual parameter types are
3055 result = that.type = currentTarget;
3056 return;
3057 } else {
3058 if (targetError) {
3059 resultInfo.checkContext.report(that, diag);
3060 } else {
3061 log.report(diag);
3062 }
3063 result = that.type = types.createErrorType(currentTarget);
3064 return;
3065 }
3066 }
3067
3068 that.sym = refSym.isConstructor() ? refSym.baseSymbol() : refSym;
3069 that.kind = lookupHelper.referenceKind(that.sym);
3070 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
3071
3072 if (desc.getReturnType() == Type.recoveryType) {
3073 // stop here
3074 result = that.type = currentTarget;
3075 return;
3076 }
3077
3078 if (!env.info.isSpeculative && that.getMode() == JCMemberReference.ReferenceMode.NEW) {
3079 Type enclosingType = exprType.getEnclosingType();
3080 if (enclosingType != null && enclosingType.hasTag(CLASS)) {
3081 // Check for the existence of an apropriate outer instance
3082 rs.resolveImplicitThis(that.pos(), env, exprType);
3083 }
3084 }
3085
3086 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
3087
3088 if (that.getMode() == ReferenceMode.INVOKE &&
3089 TreeInfo.isStaticSelector(that.expr, names) &&
3090 that.kind.isUnbound() &&
3091 lookupHelper.site.isRaw()) {
3092 chk.checkRaw(that.expr, localEnv);
3093 }
3094
3095 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
3096 exprType.getTypeArguments().nonEmpty()) {
3097 //static ref with class type-args
3098 log.error(that.expr.pos(),
3099 Errors.InvalidMref(Kinds.kindName(that.getMode()),
3100 Fragments.StaticMrefWithTargs));
3101 result = that.type = types.createErrorType(currentTarget);
3102 return;
3103 }
3104
3105 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
3106 // Check that super-qualified symbols are not abstract (JLS)
3107 rs.checkNonAbstract(that.pos(), that.sym);
3108 }
3109
3110 if (isTargetSerializable) {
3111 chk.checkAccessFromSerializableElement(that, true);
3112 }
3113 }
3114
3115 ResultInfo checkInfo =
3116 resultInfo.dup(newMethodTemplate(
3117 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
3118 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
3119 new FunctionalReturnContext(resultInfo.checkContext), CheckMode.NO_TREE_UPDATE);
3120
3121 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
3122
3123 if (that.kind.isUnbound() &&
3124 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
3125 //re-generate inference constraints for unbound receiver
3126 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
3127 //cannot happen as this has already been checked - we just need
3128 //to regenerate the inference constraints, as that has been lost
3129 //as a result of the call to inferenceContext.save()
3130 Assert.error("Can't get here");
3131 }
3132 }
3133
3134 if (!refType.isErroneous()) {
3135 refType = types.createMethodTypeWithReturn(refType,
3136 adjustMethodReturnType(refSym, lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
3137 }
3138
3139 //go ahead with standard method reference compatibility check - note that param check
3140 //is a no-op (as this has been taken care during method applicability)
3141 boolean isSpeculativeRound =
3142 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
3143
3144 that.type = currentTarget; //avoids recovery at this stage
3145 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
3146 if (!isSpeculativeRound) {
3147 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
3148 }
3149 result = check(that, currentTarget, KindSelector.VAL, resultInfo);
3150 } catch (Types.FunctionDescriptorLookupError ex) {
3151 JCDiagnostic cause = ex.getDiagnostic();
3152 resultInfo.checkContext.report(that, cause);
3153 result = that.type = types.createErrorType(pt());
3154 return;
3155 }
3156 }
3157 //where
3158 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
3159 //if this is a constructor reference, the expected kind must be a type
3160 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ?
3161 KindSelector.VAL_TYP : KindSelector.TYP,
3162 Type.noType);
3163 }
3164
3165
3166 @SuppressWarnings("fallthrough")
3167 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
3168 InferenceContext inferenceContext = checkContext.inferenceContext();
3169 Type returnType = inferenceContext.asUndetVar(descriptor.getReturnType());
3170
3171 Type resType;
3172 switch (tree.getMode()) {
3173 case NEW:
3174 if (!tree.expr.type.isRaw()) {
3175 resType = tree.expr.type;
3176 break;
3177 }
3178 default:
3179 resType = refType.getReturnType();
3180 }
3181
3182 Type incompatibleReturnType = resType;
3183
3184 if (returnType.hasTag(VOID)) {
3185 incompatibleReturnType = null;
3186 }
3187
3188 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
3189 if (resType.isErroneous() ||
3190 new FunctionalReturnContext(checkContext).compatible(resType, returnType,
3191 checkContext.checkWarner(tree, resType, returnType))) {
3192 incompatibleReturnType = null;
3193 }
3194 }
3195
3196 if (incompatibleReturnType != null) {
3197 Fragment msg =
3198 Fragments.IncompatibleRetTypeInMref(Fragments.InconvertibleTypes(resType, descriptor.getReturnType()));
3199 checkContext.report(tree, diags.fragment(msg));
3200 } else {
3201 if (inferenceContext.free(refType)) {
3202 // we need to wait for inference to finish and then replace inference vars in the referent type
3203 inferenceContext.addFreeTypeListener(List.of(refType),
3204 instantiatedContext -> {
3205 tree.referentType = instantiatedContext.asInstType(refType);
3206 });
3207 } else {
3208 tree.referentType = refType;
3209 }
3210 }
3211
3212 if (!speculativeAttr) {
3213 if (!checkExConstraints(refType.getThrownTypes(), descriptor.getThrownTypes(), inferenceContext)) {
3214 log.error(tree, Errors.IncompatibleThrownTypesInMref(refType.getThrownTypes()));
3215 }
3216 }
3217 }
3218
3219 boolean checkExConstraints(
3220 List<Type> thrownByFuncExpr,
3221 List<Type> thrownAtFuncType,
3222 InferenceContext inferenceContext) {
3223 /** 18.2.5: Otherwise, let E1, ..., En be the types in the function type's throws clause that
3224 * are not proper types
3225 */
3226 List<Type> nonProperList = thrownAtFuncType.stream()
3227 .filter(e -> inferenceContext.free(e)).collect(List.collector());
3228 List<Type> properList = thrownAtFuncType.diff(nonProperList);
3229
3230 /** Let X1,...,Xm be the checked exception types that the lambda body can throw or
3231 * in the throws clause of the invocation type of the method reference's compile-time
3232 * declaration
3233 */
3234 List<Type> checkedList = thrownByFuncExpr.stream()
3235 .filter(e -> chk.isChecked(e)).collect(List.collector());
3236
3237 /** If n = 0 (the function type's throws clause consists only of proper types), then
3238 * if there exists some i (1 <= i <= m) such that Xi is not a subtype of any proper type
3239 * in the throws clause, the constraint reduces to false; otherwise, the constraint
3240 * reduces to true
3241 */
3242 ListBuffer<Type> uncaughtByProperTypes = new ListBuffer<>();
3243 for (Type checked : checkedList) {
3244 boolean isSubtype = false;
3245 for (Type proper : properList) {
3246 if (types.isSubtype(checked, proper)) {
3247 isSubtype = true;
3248 break;
3249 }
3250 }
3251 if (!isSubtype) {
3252 uncaughtByProperTypes.add(checked);
3253 }
3254 }
3255
3256 if (nonProperList.isEmpty() && !uncaughtByProperTypes.isEmpty()) {
3257 return false;
3258 }
3259
3260 /** If n > 0, the constraint reduces to a set of subtyping constraints:
3261 * for all i (1 <= i <= m), if Xi is not a subtype of any proper type in the
3262 * throws clause, then the constraints include, for all j (1 <= j <= n), <Xi <: Ej>
3263 */
3264 List<Type> nonProperAsUndet = inferenceContext.asUndetVars(nonProperList);
3265 uncaughtByProperTypes.forEach(checkedEx -> {
3266 nonProperAsUndet.forEach(nonProper -> {
3267 types.isSubtype(checkedEx, nonProper);
3268 });
3269 });
3270
3271 /** In addition, for all j (1 <= j <= n), the constraint reduces to the bound throws Ej
3272 */
3273 nonProperAsUndet.stream()
3274 .filter(t -> t.hasTag(UNDETVAR))
3275 .forEach(t -> ((UndetVar)t).setThrow());
3276 return true;
3277 }
3278
3279 /**
3280 * Set functional type info on the underlying AST. Note: as the target descriptor
3281 * might contain inference variables, we might need to register an hook in the
3282 * current inference context.
3283 */
3284 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
3285 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
3286 if (checkContext.inferenceContext().free(descriptorType)) {
3287 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType),
3288 inferenceContext -> setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
3289 inferenceContext.asInstType(primaryTarget), checkContext));
3290 } else {
3291 if (pt.hasTag(CLASS)) {
3292 fExpr.target = primaryTarget;
3293 }
3294 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
3295 pt != Type.recoveryType) {
3296 //check that functional interface class is well-formed
3297 try {
3298 /* Types.makeFunctionalInterfaceClass() may throw an exception
3299 * when it's executed post-inference. See the listener code
3300 * above.
3301 */
3302 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
3303 names.empty, fExpr.target, ABSTRACT);
3304 if (csym != null) {
3305 chk.checkImplementations(env.tree, csym, csym);
3306 try {
3307 //perform an additional functional interface check on the synthetic class,
3308 //as there may be spurious errors for raw targets - because of existing issues
3309 //with membership and inheritance (see JDK-8074570).
3310 csym.flags_field |= INTERFACE;
3311 types.findDescriptorType(csym.type);
3312 } catch (FunctionDescriptorLookupError err) {
3313 resultInfo.checkContext.report(fExpr,
3314 diags.fragment(Fragments.NoSuitableFunctionalIntfInst(fExpr.target)));
3315 }
3316 }
3317 } catch (Types.FunctionDescriptorLookupError ex) {
3318 JCDiagnostic cause = ex.getDiagnostic();
3319 resultInfo.checkContext.report(env.tree, cause);
3320 }
3321 }
3322 }
3323 }
3324
3325 public void visitParens(JCParens tree) {
3326 Type owntype = attribTree(tree.expr, env, resultInfo);
3327 result = check(tree, owntype, pkind(), resultInfo);
3328 Symbol sym = TreeInfo.symbol(tree);
3329 if (sym != null && sym.kind.matches(KindSelector.TYP_PCK))
3330 log.error(tree.pos(), Errors.IllegalParenthesizedExpression);
3331 }
3332
3333 public void visitAssign(JCAssign tree) {
3334 Type owntype = attribTree(tree.lhs, env.dup(tree), varAssignmentInfo);
3335 Type capturedType = capture(owntype);
3336 attribExpr(tree.rhs, env, owntype);
3337 result = check(tree, capturedType, KindSelector.VAL, resultInfo);
3338 }
3339
3340 public void visitAssignop(JCAssignOp tree) {
3341 // Attribute arguments.
3342 Type owntype = attribTree(tree.lhs, env, varAssignmentInfo);
3343 Type operand = attribExpr(tree.rhs, env);
3344 // Find operator.
3345 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag().noAssignOp(), owntype, operand);
3346 if (operator != operators.noOpSymbol &&
3347 !owntype.isErroneous() &&
3348 !operand.isErroneous()) {
3349 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3350 chk.checkCastable(tree.rhs.pos(),
3351 operator.type.getReturnType(),
3352 owntype);
3353 }
3354 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3355 }
3356
3357 public void visitUnary(JCUnary tree) {
3358 // Attribute arguments.
3359 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3360 ? attribTree(tree.arg, env, varAssignmentInfo)
3361 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3362
3363 // Find operator.
3364 Symbol operator = tree.operator = operators.resolveUnary(tree, tree.getTag(), argtype);
3365 Type owntype = types.createErrorType(tree.type);
3366 if (operator != operators.noOpSymbol &&
3367 !argtype.isErroneous()) {
3368 owntype = (tree.getTag().isIncOrDecUnaryOp())
3369 ? tree.arg.type
3370 : operator.type.getReturnType();
3371 int opc = ((OperatorSymbol)operator).opcode;
3372
3373 // If the argument is constant, fold it.
3374 if (argtype.constValue() != null) {
3375 Type ctype = cfolder.fold1(opc, argtype);
3376 if (ctype != null) {
3377 owntype = cfolder.coerce(ctype, owntype);
3378 }
3379 }
3380 }
3381 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3382 }
3383
3384 public void visitBinary(JCBinary tree) {
3385 // Attribute arguments.
3386 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3387 Type right = chk.checkNonVoid(tree.rhs.pos(), attribExpr(tree.rhs, env));
3388 // Find operator.
3389 Symbol operator = tree.operator = operators.resolveBinary(tree, tree.getTag(), left, right);
3390 Type owntype = types.createErrorType(tree.type);
3391 if (operator != operators.noOpSymbol &&
3392 !left.isErroneous() &&
3393 !right.isErroneous()) {
3394 owntype = operator.type.getReturnType();
3395 int opc = ((OperatorSymbol)operator).opcode;
3396 // If both arguments are constants, fold them.
3397 if (left.constValue() != null && right.constValue() != null) {
3398 Type ctype = cfolder.fold2(opc, left, right);
3399 if (ctype != null) {
3400 owntype = cfolder.coerce(ctype, owntype);
3401 }
3402 }
3403
3404 // Check that argument types of a reference ==, != are
3405 // castable to each other, (JLS 15.21). Note: unboxing
3406 // comparisons will not have an acmp* opc at this point.
3407 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3408 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3409 log.error(tree.pos(), Errors.IncomparableTypes(left, right));
3410 }
3411 }
3412
3413 chk.checkDivZero(tree.rhs.pos(), operator, right);
3414 }
3415 result = check(tree, owntype, KindSelector.VAL, resultInfo);
3416 }
3417
3418 public void visitTypeCast(final JCTypeCast tree) {
3419 Type clazztype = attribType(tree.clazz, env);
3420 chk.validate(tree.clazz, env, false);
3421 //a fresh environment is required for 292 inference to work properly ---
3422 //see Infer.instantiatePolymorphicSignatureInstance()
3423 Env<AttrContext> localEnv = env.dup(tree);
3424 //should we propagate the target type?
3425 final ResultInfo castInfo;
3426 JCExpression expr = TreeInfo.skipParens(tree.expr);
3427 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3428 if (isPoly) {
3429 //expression is a poly - we need to propagate target type info
3430 castInfo = new ResultInfo(KindSelector.VAL, clazztype,
3431 new Check.NestedCheckContext(resultInfo.checkContext) {
3432 @Override
3433 public boolean compatible(Type found, Type req, Warner warn) {
3434 return types.isCastable(found, req, warn);
3435 }
3436 });
3437 } else {
3438 //standalone cast - target-type info is not propagated
3439 castInfo = unknownExprInfo;
3440 }
3441 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3442 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3443 if (exprtype.constValue() != null)
3444 owntype = cfolder.coerce(exprtype, owntype);
3445 result = check(tree, capture(owntype), KindSelector.VAL, resultInfo);
3446 if (!isPoly)
3447 chk.checkRedundantCast(localEnv, tree);
3448 }
3449
3450 public void visitTypeTest(JCInstanceOf tree) {
3451 Type exprtype = chk.checkNullOrRefType(
3452 tree.expr.pos(), attribExpr(tree.expr, env));
3453 Type clazztype = attribType(tree.clazz, env);
3454 if (!clazztype.hasTag(TYPEVAR)) {
3455 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3456 }
3457 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3458 log.error(tree.clazz.pos(), Errors.IllegalGenericTypeForInstof);
3459 clazztype = types.createErrorType(clazztype);
3460 }
3461 chk.validate(tree.clazz, env, false);
3462 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3463 result = check(tree, syms.booleanType, KindSelector.VAL, resultInfo);
3464 }
3465
3466 public void visitIndexed(JCArrayAccess tree) {
3467 Type owntype = types.createErrorType(tree.type);
3468 Type atype = attribExpr(tree.indexed, env);
3469 attribExpr(tree.index, env, syms.intType);
3470 if (types.isArray(atype))
3471 owntype = types.elemtype(atype);
3472 else if (!atype.hasTag(ERROR))
3473 log.error(tree.pos(), Errors.ArrayReqButFound(atype));
3474 if (!pkind().contains(KindSelector.VAL))
3475 owntype = capture(owntype);
3476 result = check(tree, owntype, KindSelector.VAR, resultInfo);
3477 }
3478
3479 public void visitIdent(JCIdent tree) {
3480 Symbol sym;
3481
3482 // Find symbol
3483 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3484 // If we are looking for a method, the prototype `pt' will be a
3485 // method type with the type of the call's arguments as parameters.
3486 env.info.pendingResolutionPhase = null;
3487 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3488 } else if (tree.sym != null && tree.sym.kind != VAR) {
3489 sym = tree.sym;
3490 } else {
3491 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3492 }
3493 tree.sym = sym;
3494
3495 // (1) Also find the environment current for the class where
3496 // sym is defined (`symEnv').
3497 // Only for pre-tiger versions (1.4 and earlier):
3498 // (2) Also determine whether we access symbol out of an anonymous
3499 // class in a this or super call. This is illegal for instance
3500 // members since such classes don't carry a this$n link.
3501 // (`noOuterThisPath').
3502 Env<AttrContext> symEnv = env;
3503 boolean noOuterThisPath = false;
3504 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3505 sym.kind.matches(KindSelector.VAL_MTH) &&
3506 sym.owner.kind == TYP &&
3507 tree.name != names._this && tree.name != names._super) {
3508
3509 // Find environment in which identifier is defined.
3510 while (symEnv.outer != null &&
3511 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3512 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3513 noOuterThisPath = false;
3514 symEnv = symEnv.outer;
3515 }
3516 }
3517
3518 // If symbol is a variable, ...
3519 if (sym.kind == VAR) {
3520 VarSymbol v = (VarSymbol)sym;
3521
3522 // ..., evaluate its initializer, if it has one, and check for
3523 // illegal forward reference.
3524 checkInit(tree, env, v, false);
3525
3526 // If we are expecting a variable (as opposed to a value), check
3527 // that the variable is assignable in the current environment.
3528 if (KindSelector.ASG.subset(pkind()))
3529 checkAssignable(tree.pos(), v, null, env);
3530 }
3531
3532 // In a constructor body,
3533 // if symbol is a field or instance method, check that it is
3534 // not accessed before the supertype constructor is called.
3535 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3536 sym.kind.matches(KindSelector.VAL_MTH) &&
3537 sym.owner.kind == TYP &&
3538 (sym.flags() & STATIC) == 0) {
3539 chk.earlyRefError(tree.pos(), sym.kind == VAR ?
3540 sym : thisSym(tree.pos(), env));
3541 }
3542 Env<AttrContext> env1 = env;
3543 if (sym.kind != ERR && sym.kind != TYP &&
3544 sym.owner != null && sym.owner != env1.enclClass.sym) {
3545 // If the found symbol is inaccessible, then it is
3546 // accessed through an enclosing instance. Locate this
3547 // enclosing instance:
3548 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3549 env1 = env1.outer;
3550 }
3551
3552 if (env.info.isSerializable) {
3553 chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
3554 }
3555
3556 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3557 }
3558
3559 public void visitSelect(JCFieldAccess tree) {
3560 // Determine the expected kind of the qualifier expression.
3561 KindSelector skind = KindSelector.NIL;
3562 if (tree.name == names._this || tree.name == names._super ||
3563 tree.name == names._class)
3564 {
3565 skind = KindSelector.TYP;
3566 } else {
3567 if (pkind().contains(KindSelector.PCK))
3568 skind = KindSelector.of(skind, KindSelector.PCK);
3569 if (pkind().contains(KindSelector.TYP))
3570 skind = KindSelector.of(skind, KindSelector.TYP, KindSelector.PCK);
3571 if (pkind().contains(KindSelector.VAL_MTH))
3572 skind = KindSelector.of(skind, KindSelector.VAL, KindSelector.TYP);
3573 }
3574
3575 // Attribute the qualifier expression, and determine its symbol (if any).
3576 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Type.noType));
3577 if (!pkind().contains(KindSelector.TYP_PCK))
3578 site = capture(site); // Capture field access
3579
3580 // don't allow T.class T[].class, etc
3581 if (skind == KindSelector.TYP) {
3582 Type elt = site;
3583 while (elt.hasTag(ARRAY))
3584 elt = ((ArrayType)elt).elemtype;
3585 if (elt.hasTag(TYPEVAR)) {
3586 log.error(tree.pos(), Errors.TypeVarCantBeDeref);
3587 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
3588 tree.sym = tree.type.tsym;
3589 return ;
3590 }
3591 }
3592
3593 // If qualifier symbol is a type or `super', assert `selectSuper'
3594 // for the selection. This is relevant for determining whether
3595 // protected symbols are accessible.
3596 Symbol sitesym = TreeInfo.symbol(tree.selected);
3597 boolean selectSuperPrev = env.info.selectSuper;
3598 env.info.selectSuper =
3599 sitesym != null &&
3600 sitesym.name == names._super;
3601
3602 // Determine the symbol represented by the selection.
3603 env.info.pendingResolutionPhase = null;
3604 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3605 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
3606 log.error(tree.selected.pos(), Errors.NotEnclClass(site.tsym));
3607 sym = syms.errSymbol;
3608 }
3609 if (sym.exists() && !isType(sym) && pkind().contains(KindSelector.TYP_PCK)) {
3610 site = capture(site);
3611 sym = selectSym(tree, sitesym, site, env, resultInfo);
3612 }
3613 boolean varArgs = env.info.lastResolveVarargs();
3614 tree.sym = sym;
3615
3616 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3617 site = types.skipTypeVars(site, true);
3618 }
3619
3620 // If that symbol is a variable, ...
3621 if (sym.kind == VAR) {
3622 VarSymbol v = (VarSymbol)sym;
3623
3624 // ..., evaluate its initializer, if it has one, and check for
3625 // illegal forward reference.
3626 checkInit(tree, env, v, true);
3627
3628 // If we are expecting a variable (as opposed to a value), check
3629 // that the variable is assignable in the current environment.
3630 if (KindSelector.ASG.subset(pkind()))
3631 checkAssignable(tree.pos(), v, tree.selected, env);
3632 }
3633
3634 if (sitesym != null &&
3635 sitesym.kind == VAR &&
3636 ((VarSymbol)sitesym).isResourceVariable() &&
3637 sym.kind == MTH &&
3638 sym.name.equals(names.close) &&
3639 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3640 env.info.lint.isEnabled(LintCategory.TRY)) {
3641 log.warning(LintCategory.TRY, tree, Warnings.TryExplicitCloseCall);
3642 }
3643
3644 // Disallow selecting a type from an expression
3645 if (isType(sym) && (sitesym == null || !sitesym.kind.matches(KindSelector.TYP_PCK))) {
3646 tree.type = check(tree.selected, pt(),
3647 sitesym == null ?
3648 KindSelector.VAL : sitesym.kind.toSelector(),
3649 new ResultInfo(KindSelector.TYP_PCK, pt()));
3650 }
3651
3652 if (isType(sitesym)) {
3653 if (sym.name == names._this) {
3654 // If `C' is the currently compiled class, check that
3655 // C.this' does not appear in a call to a super(...)
3656 if (env.info.isSelfCall &&
3657 site.tsym == env.enclClass.sym) {
3658 chk.earlyRefError(tree.pos(), sym);
3659 }
3660 } else {
3661 // Check if type-qualified fields or methods are static (JLS)
3662 if ((sym.flags() & STATIC) == 0 &&
3663 sym.name != names._super &&
3664 (sym.kind == VAR || sym.kind == MTH)) {
3665 rs.accessBase(rs.new StaticError(sym),
3666 tree.pos(), site, sym.name, true);
3667 }
3668 }
3669 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
3670 sym.isStatic() && sym.kind == MTH) {
3671 log.error(DiagnosticFlag.SOURCE_LEVEL, tree.pos(), Feature.STATIC_INTERFACE_METHODS_INVOKE.error(sourceName));
3672 }
3673 } else if (sym.kind != ERR &&
3674 (sym.flags() & STATIC) != 0 &&
3675 sym.name != names._class) {
3676 // If the qualified item is not a type and the selected item is static, report
3677 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3678 chk.warnStatic(tree, Warnings.StaticNotQualifiedByType(sym.kind.kindName(), sym.owner));
3679 }
3680
3681 // If we are selecting an instance member via a `super', ...
3682 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3683
3684 // Check that super-qualified symbols are not abstract (JLS)
3685 rs.checkNonAbstract(tree.pos(), sym);
3686
3687 if (site.isRaw()) {
3688 // Determine argument types for site.
3689 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3690 if (site1 != null) site = site1;
3691 }
3692 }
3693
3694 if (env.info.isSerializable) {
3695 chk.checkAccessFromSerializableElement(tree, env.info.isLambda);
3696 }
3697
3698 env.info.selectSuper = selectSuperPrev;
3699 result = checkId(tree, site, sym, env, resultInfo);
3700 }
3701 //where
3702 /** Determine symbol referenced by a Select expression,
3703 *
3704 * @param tree The select tree.
3705 * @param site The type of the selected expression,
3706 * @param env The current environment.
3707 * @param resultInfo The current result.
3708 */
3709 private Symbol selectSym(JCFieldAccess tree,
3710 Symbol location,
3711 Type site,
3712 Env<AttrContext> env,
3713 ResultInfo resultInfo) {
3714 DiagnosticPosition pos = tree.pos();
3715 Name name = tree.name;
3716 switch (site.getTag()) {
3717 case PACKAGE:
3718 return rs.accessBase(
3719 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3720 pos, location, site, name, true);
3721 case ARRAY:
3722 case CLASS:
3723 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3724 return rs.resolveQualifiedMethod(
3725 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3726 } else if (name == names._this || name == names._super) {
3727 return rs.resolveSelf(pos, env, site.tsym, name);
3728 } else if (name == names._class) {
3729 // In this case, we have already made sure in
3730 // visitSelect that qualifier expression is a type.
3731 return syms.getClassField(site, types);
3732 } else {
3733 // We are seeing a plain identifier as selector.
3734 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3735 sym = rs.accessBase(sym, pos, location, site, name, true);
3736 return sym;
3737 }
3738 case WILDCARD:
3739 throw new AssertionError(tree);
3740 case TYPEVAR:
3741 // Normally, site.getUpperBound() shouldn't be null.
3742 // It should only happen during memberEnter/attribBase
3743 // when determining the super type which *must* beac
3744 // done before attributing the type variables. In
3745 // other words, we are seeing this illegal program:
3746 // class B<T> extends A<T.foo> {}
3747 Symbol sym = (site.getUpperBound() != null)
3748 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3749 : null;
3750 if (sym == null) {
3751 log.error(pos, Errors.TypeVarCantBeDeref);
3752 return syms.errSymbol;
3753 } else {
3754 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3755 rs.new AccessError(env, site, sym) :
3756 sym;
3757 rs.accessBase(sym2, pos, location, site, name, true);
3758 return sym;
3759 }
3760 case ERROR:
3761 // preserve identifier names through errors
3762 return types.createErrorType(name, site.tsym, site).tsym;
3763 default:
3764 // The qualifier expression is of a primitive type -- only
3765 // .class is allowed for these.
3766 if (name == names._class) {
3767 // In this case, we have already made sure in Select that
3768 // qualifier expression is a type.
3769 return syms.getClassField(site, types);
3770 } else {
3771 log.error(pos, Errors.CantDeref(site));
3772 return syms.errSymbol;
3773 }
3774 }
3775 }
3776
3777 /** Determine type of identifier or select expression and check that
3778 * (1) the referenced symbol is not deprecated
3779 * (2) the symbol's type is safe (@see checkSafe)
3780 * (3) if symbol is a variable, check that its type and kind are
3781 * compatible with the prototype and protokind.
3782 * (4) if symbol is an instance field of a raw type,
3783 * which is being assigned to, issue an unchecked warning if its
3784 * type changes under erasure.
3785 * (5) if symbol is an instance method of a raw type, issue an
3786 * unchecked warning if its argument types change under erasure.
3787 * If checks succeed:
3788 * If symbol is a constant, return its constant type
3789 * else if symbol is a method, return its result type
3790 * otherwise return its type.
3791 * Otherwise return errType.
3792 *
3793 * @param tree The syntax tree representing the identifier
3794 * @param site If this is a select, the type of the selected
3795 * expression, otherwise the type of the current class.
3796 * @param sym The symbol representing the identifier.
3797 * @param env The current environment.
3798 * @param resultInfo The expected result
3799 */
3800 Type checkId(JCTree tree,
3801 Type site,
3802 Symbol sym,
3803 Env<AttrContext> env,
3804 ResultInfo resultInfo) {
3805 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3806 checkMethodIdInternal(tree, site, sym, env, resultInfo) :
3807 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3808 }
3809
3810 Type checkMethodIdInternal(JCTree tree,
3811 Type site,
3812 Symbol sym,
3813 Env<AttrContext> env,
3814 ResultInfo resultInfo) {
3815 if (resultInfo.pkind.contains(KindSelector.POLY)) {
3816 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3817 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3818 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3819 return owntype;
3820 } else {
3821 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3822 }
3823 }
3824
3825 Type checkIdInternal(JCTree tree,
3826 Type site,
3827 Symbol sym,
3828 Type pt,
3829 Env<AttrContext> env,
3830 ResultInfo resultInfo) {
3831 if (pt.isErroneous()) {
3832 return types.createErrorType(site);
3833 }
3834 Type owntype; // The computed type of this identifier occurrence.
3835 switch (sym.kind) {
3836 case TYP:
3837 // For types, the computed type equals the symbol's type,
3838 // except for two situations:
3839 owntype = sym.type;
3840 if (owntype.hasTag(CLASS)) {
3841 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3842 Type ownOuter = owntype.getEnclosingType();
3843
3844 // (a) If the symbol's type is parameterized, erase it
3845 // because no type parameters were given.
3846 // We recover generic outer type later in visitTypeApply.
3847 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3848 owntype = types.erasure(owntype);
3849 }
3850
3851 // (b) If the symbol's type is an inner class, then
3852 // we have to interpret its outer type as a superclass
3853 // of the site type. Example:
3854 //
3855 // class Tree<A> { class Visitor { ... } }
3856 // class PointTree extends Tree<Point> { ... }
3857 // ...PointTree.Visitor...
3858 //
3859 // Then the type of the last expression above is
3860 // Tree<Point>.Visitor.
3861 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3862 Type normOuter = site;
3863 if (normOuter.hasTag(CLASS)) {
3864 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3865 }
3866 if (normOuter == null) // perhaps from an import
3867 normOuter = types.erasure(ownOuter);
3868 if (normOuter != ownOuter)
3869 owntype = new ClassType(
3870 normOuter, List.nil(), owntype.tsym,
3871 owntype.getMetadata());
3872 }
3873 }
3874 break;
3875 case VAR:
3876 VarSymbol v = (VarSymbol)sym;
3877
3878 if (env.info.enclVar != null
3879 && v.type.hasTag(NONE)) {
3880 //self reference to implicitly typed variable declaration
3881 log.error(TreeInfo.positionFor(v, env.enclClass), Errors.CantInferLocalVarType(v.name, Fragments.LocalSelfRef));
3882 return v.type = types.createErrorType(v.type);
3883 }
3884
3885 // Test (4): if symbol is an instance field of a raw type,
3886 // which is being assigned to, issue an unchecked warning if
3887 // its type changes under erasure.
3888 if (KindSelector.ASG.subset(pkind()) &&
3889 v.owner.kind == TYP &&
3890 (v.flags() & STATIC) == 0 &&
3891 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3892 Type s = types.asOuterSuper(site, v.owner);
3893 if (s != null &&
3894 s.isRaw() &&
3895 !types.isSameType(v.type, v.erasure(types))) {
3896 chk.warnUnchecked(tree.pos(), Warnings.UncheckedAssignToVar(v, s));
3897 }
3898 }
3899 // The computed type of a variable is the type of the
3900 // variable symbol, taken as a member of the site type.
3901 owntype = (sym.owner.kind == TYP &&
3902 sym.name != names._this && sym.name != names._super)
3903 ? types.memberType(site, sym)
3904 : sym.type;
3905
3906 // If the variable is a constant, record constant value in
3907 // computed type.
3908 if (v.getConstValue() != null && isStaticReference(tree))
3909 owntype = owntype.constType(v.getConstValue());
3910
3911 if (resultInfo.pkind == KindSelector.VAL) {
3912 owntype = capture(owntype); // capture "names as expressions"
3913 }
3914 break;
3915 case MTH: {
3916 owntype = checkMethod(site, sym,
3917 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext, resultInfo.checkMode),
3918 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3919 resultInfo.pt.getTypeArguments());
3920 break;
3921 }
3922 case PCK: case ERR:
3923 owntype = sym.type;
3924 break;
3925 default:
3926 throw new AssertionError("unexpected kind: " + sym.kind +
3927 " in tree " + tree);
3928 }
3929
3930 // Emit a `deprecation' warning if symbol is deprecated.
3931 // (for constructors (but not for constructor references), the error
3932 // was given when the constructor was resolved)
3933
3934 if (sym.name != names.init || tree.hasTag(REFERENCE)) {
3935 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3936 chk.checkSunAPI(tree.pos(), sym);
3937 chk.checkProfile(tree.pos(), sym);
3938 }
3939
3940 // If symbol is a variable, check that its type and
3941 // kind are compatible with the prototype and protokind.
3942 return check(tree, owntype, sym.kind.toSelector(), resultInfo);
3943 }
3944
3945 /** Check that variable is initialized and evaluate the variable's
3946 * initializer, if not yet done. Also check that variable is not
3947 * referenced before it is defined.
3948 * @param tree The tree making up the variable reference.
3949 * @param env The current environment.
3950 * @param v The variable's symbol.
3951 */
3952 private void checkInit(JCTree tree,
3953 Env<AttrContext> env,
3954 VarSymbol v,
3955 boolean onlyWarning) {
3956 // A forward reference is diagnosed if the declaration position
3957 // of the variable is greater than the current tree position
3958 // and the tree and variable definition occur in the same class
3959 // definition. Note that writes don't count as references.
3960 // This check applies only to class and instance
3961 // variables. Local variables follow different scope rules,
3962 // and are subject to definite assignment checking.
3963 Env<AttrContext> initEnv = enclosingInitEnv(env);
3964 if (initEnv != null &&
3965 (initEnv.info.enclVar == v || v.pos > tree.pos) &&
3966 v.owner.kind == TYP &&
3967 v.owner == env.info.scope.owner.enclClass() &&
3968 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3969 (!env.tree.hasTag(ASSIGN) ||
3970 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3971 if (!onlyWarning || isStaticEnumField(v)) {
3972 Error errkey = (initEnv.info.enclVar == v) ?
3973 Errors.IllegalSelfRef : Errors.IllegalForwardRef;
3974 log.error(tree.pos(), errkey);
3975 } else if (useBeforeDeclarationWarning) {
3976 Warning warnkey = (initEnv.info.enclVar == v) ?
3977 Warnings.SelfRef(v) : Warnings.ForwardRef(v);
3978 log.warning(tree.pos(), warnkey);
3979 }
3980 }
3981
3982 v.getConstValue(); // ensure initializer is evaluated
3983
3984 checkEnumInitializer(tree, env, v);
3985 }
3986
3987 /**
3988 * Returns the enclosing init environment associated with this env (if any). An init env
3989 * can be either a field declaration env or a static/instance initializer env.
3990 */
3991 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
3992 while (true) {
3993 switch (env.tree.getTag()) {
3994 case VARDEF:
3995 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
3996 if (vdecl.sym.owner.kind == TYP) {
3997 //field
3998 return env;
3999 }
4000 break;
4001 case BLOCK:
4002 if (env.next.tree.hasTag(CLASSDEF)) {
4003 //instance/static initializer
4004 return env;
4005 }
4006 break;
4007 case METHODDEF:
4008 case CLASSDEF:
4009 case TOPLEVEL:
4010 return null;
4011 }
4012 Assert.checkNonNull(env.next);
4013 env = env.next;
4014 }
4015 }
4016
4017 /**
4018 * Check for illegal references to static members of enum. In
4019 * an enum type, constructors and initializers may not
4020 * reference its static members unless they are constant.
4021 *
4022 * @param tree The tree making up the variable reference.
4023 * @param env The current environment.
4024 * @param v The variable's symbol.
4025 * @jls section 8.9 Enums
4026 */
4027 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
4028 // JLS:
4029 //
4030 // "It is a compile-time error to reference a static field
4031 // of an enum type that is not a compile-time constant
4032 // (15.28) from constructors, instance initializer blocks,
4033 // or instance variable initializer expressions of that
4034 // type. It is a compile-time error for the constructors,
4035 // instance initializer blocks, or instance variable
4036 // initializer expressions of an enum constant e to refer
4037 // to itself or to an enum constant of the same type that
4038 // is declared to the right of e."
4039 if (isStaticEnumField(v)) {
4040 ClassSymbol enclClass = env.info.scope.owner.enclClass();
4041
4042 if (enclClass == null || enclClass.owner == null)
4043 return;
4044
4045 // See if the enclosing class is the enum (or a
4046 // subclass thereof) declaring v. If not, this
4047 // reference is OK.
4048 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
4049 return;
4050
4051 // If the reference isn't from an initializer, then
4052 // the reference is OK.
4053 if (!Resolve.isInitializer(env))
4054 return;
4055
4056 log.error(tree.pos(), Errors.IllegalEnumStaticRef);
4057 }
4058 }
4059
4060 /** Is the given symbol a static, non-constant field of an Enum?
4061 * Note: enum literals should not be regarded as such
4062 */
4063 private boolean isStaticEnumField(VarSymbol v) {
4064 return Flags.isEnum(v.owner) &&
4065 Flags.isStatic(v) &&
4066 !Flags.isConstant(v) &&
4067 v.name != names._class;
4068 }
4069
4070 /**
4071 * Check that method arguments conform to its instantiation.
4072 **/
4073 public Type checkMethod(Type site,
4074 final Symbol sym,
4075 ResultInfo resultInfo,
4076 Env<AttrContext> env,
4077 final List<JCExpression> argtrees,
4078 List<Type> argtypes,
4079 List<Type> typeargtypes) {
4080 // Test (5): if symbol is an instance method of a raw type, issue
4081 // an unchecked warning if its argument types change under erasure.
4082 if ((sym.flags() & STATIC) == 0 &&
4083 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
4084 Type s = types.asOuterSuper(site, sym.owner);
4085 if (s != null && s.isRaw() &&
4086 !types.isSameTypes(sym.type.getParameterTypes(),
4087 sym.erasure(types).getParameterTypes())) {
4088 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedCallMbrOfRawType(sym, s));
4089 }
4090 }
4091
4092 if (env.info.defaultSuperCallSite != null) {
4093 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
4094 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
4095 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
4096 List<MethodSymbol> icand_sup =
4097 types.interfaceCandidates(sup, (MethodSymbol)sym);
4098 if (icand_sup.nonEmpty() &&
4099 icand_sup.head != sym &&
4100 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
4101 log.error(env.tree.pos(),
4102 Errors.IllegalDefaultSuperCall(env.info.defaultSuperCallSite, Fragments.OverriddenDefault(sym, sup)));
4103 break;
4104 }
4105 }
4106 env.info.defaultSuperCallSite = null;
4107 }
4108
4109 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
4110 JCMethodInvocation app = (JCMethodInvocation)env.tree;
4111 if (app.meth.hasTag(SELECT) &&
4112 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
4113 log.error(env.tree.pos(), Errors.IllegalStaticIntfMethCall(site));
4114 }
4115 }
4116
4117 // Compute the identifier's instantiated type.
4118 // For methods, we need to compute the instance type by
4119 // Resolve.instantiate from the symbol's type as well as
4120 // any type arguments and value arguments.
4121 Warner noteWarner = new Warner();
4122 try {
4123 Type owntype = rs.checkMethod(
4124 env,
4125 site,
4126 sym,
4127 resultInfo,
4128 argtypes,
4129 typeargtypes,
4130 noteWarner);
4131
4132 DeferredAttr.DeferredTypeMap<Void> checkDeferredMap =
4133 deferredAttr.new DeferredTypeMap<>(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
4134
4135 argtypes = argtypes.map(checkDeferredMap);
4136
4137 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
4138 chk.warnUnchecked(env.tree.pos(), Warnings.UncheckedMethInvocationApplied(kindName(sym),
4139 sym.name,
4140 rs.methodArguments(sym.type.getParameterTypes()),
4141 rs.methodArguments(argtypes.map(checkDeferredMap)),
4142 kindName(sym.location()),
4143 sym.location()));
4144 if (resultInfo.pt != Infer.anyPoly ||
4145 !owntype.hasTag(METHOD) ||
4146 !owntype.isPartial()) {
4147 //if this is not a partially inferred method type, erase return type. Otherwise,
4148 //erasure is carried out in PartiallyInferredMethodType.check().
4149 owntype = new MethodType(owntype.getParameterTypes(),
4150 types.erasure(owntype.getReturnType()),
4151 types.erasure(owntype.getThrownTypes()),
4152 syms.methodClass);
4153 }
4154 }
4155
4156 PolyKind pkind = (sym.type.hasTag(FORALL) &&
4157 sym.type.getReturnType().containsAny(((ForAll)sym.type).tvars)) ?
4158 PolyKind.POLY : PolyKind.STANDALONE;
4159 TreeInfo.setPolyKind(env.tree, pkind);
4160
4161 return (resultInfo.pt == Infer.anyPoly) ?
4162 owntype :
4163 chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
4164 resultInfo.checkContext.inferenceContext());
4165 } catch (Infer.InferenceException ex) {
4166 //invalid target type - propagate exception outwards or report error
4167 //depending on the current check context
4168 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
4169 return types.createErrorType(site);
4170 } catch (Resolve.InapplicableMethodException ex) {
4171 final JCDiagnostic diag = ex.getDiagnostic();
4172 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
4173 @Override
4174 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4175 return new Pair<>(sym, diag);
4176 }
4177 };
4178 List<Type> argtypes2 = argtypes.map(
4179 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
4180 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
4181 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
4182 log.report(errDiag);
4183 return types.createErrorType(site);
4184 }
4185 }
4186
4187 public void visitLiteral(JCLiteral tree) {
4188 result = check(tree, litType(tree.typetag).constType(tree.value),
4189 KindSelector.VAL, resultInfo);
4190 }
4191 //where
4192 /** Return the type of a literal with given type tag.
4193 */
4194 Type litType(TypeTag tag) {
4195 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
4196 }
4197
4198 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
4199 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], KindSelector.TYP, resultInfo);
4200 }
4201
4202 public void visitTypeArray(JCArrayTypeTree tree) {
4203 Type etype = attribType(tree.elemtype, env);
4204 Type type = new ArrayType(etype, syms.arrayClass);
4205 result = check(tree, type, KindSelector.TYP, resultInfo);
4206 }
4207
4208 /** Visitor method for parameterized types.
4209 * Bound checking is left until later, since types are attributed
4210 * before supertype structure is completely known
4211 */
4212 public void visitTypeApply(JCTypeApply tree) {
4213 Type owntype = types.createErrorType(tree.type);
4214
4215 // Attribute functor part of application and make sure it's a class.
4216 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
4217
4218 // Attribute type parameters
4219 List<Type> actuals = attribTypes(tree.arguments, env);
4220
4221 if (clazztype.hasTag(CLASS)) {
4222 List<Type> formals = clazztype.tsym.type.getTypeArguments();
4223 if (actuals.isEmpty()) //diamond
4224 actuals = formals;
4225
4226 if (actuals.length() == formals.length()) {
4227 List<Type> a = actuals;
4228 List<Type> f = formals;
4229 while (a.nonEmpty()) {
4230 a.head = a.head.withTypeVar(f.head);
4231 a = a.tail;
4232 f = f.tail;
4233 }
4234 // Compute the proper generic outer
4235 Type clazzOuter = clazztype.getEnclosingType();
4236 if (clazzOuter.hasTag(CLASS)) {
4237 Type site;
4238 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
4239 if (clazz.hasTag(IDENT)) {
4240 site = env.enclClass.sym.type;
4241 } else if (clazz.hasTag(SELECT)) {
4242 site = ((JCFieldAccess) clazz).selected.type;
4243 } else throw new AssertionError(""+tree);
4244 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
4245 if (site.hasTag(CLASS))
4246 site = types.asOuterSuper(site, clazzOuter.tsym);
4247 if (site == null)
4248 site = types.erasure(clazzOuter);
4249 clazzOuter = site;
4250 }
4251 }
4252 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym,
4253 clazztype.getMetadata());
4254 } else {
4255 if (formals.length() != 0) {
4256 log.error(tree.pos(),
4257 Errors.WrongNumberTypeArgs(Integer.toString(formals.length())));
4258 } else {
4259 log.error(tree.pos(), Errors.TypeDoesntTakeParams(clazztype.tsym));
4260 }
4261 owntype = types.createErrorType(tree.type);
4262 }
4263 }
4264 result = check(tree, owntype, KindSelector.TYP, resultInfo);
4265 }
4266
4267 public void visitTypeUnion(JCTypeUnion tree) {
4268 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
4269 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
4270 for (JCExpression typeTree : tree.alternatives) {
4271 Type ctype = attribType(typeTree, env);
4272 ctype = chk.checkType(typeTree.pos(),
4273 chk.checkClassType(typeTree.pos(), ctype),
4274 syms.throwableType);
4275 if (!ctype.isErroneous()) {
4276 //check that alternatives of a union type are pairwise
4277 //unrelated w.r.t. subtyping
4278 if (chk.intersects(ctype, multicatchTypes.toList())) {
4279 for (Type t : multicatchTypes) {
4280 boolean sub = types.isSubtype(ctype, t);
4281 boolean sup = types.isSubtype(t, ctype);
4282 if (sub || sup) {
4283 //assume 'a' <: 'b'
4284 Type a = sub ? ctype : t;
4285 Type b = sub ? t : ctype;
4286 log.error(typeTree.pos(), Errors.MulticatchTypesMustBeDisjoint(a, b));
4287 }
4288 }
4289 }
4290 multicatchTypes.append(ctype);
4291 if (all_multicatchTypes != null)
4292 all_multicatchTypes.append(ctype);
4293 } else {
4294 if (all_multicatchTypes == null) {
4295 all_multicatchTypes = new ListBuffer<>();
4296 all_multicatchTypes.appendList(multicatchTypes);
4297 }
4298 all_multicatchTypes.append(ctype);
4299 }
4300 }
4301 Type t = check(tree, types.lub(multicatchTypes.toList()),
4302 KindSelector.TYP, resultInfo.dup(CheckMode.NO_TREE_UPDATE));
4303 if (t.hasTag(CLASS)) {
4304 List<Type> alternatives =
4305 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
4306 t = new UnionClassType((ClassType) t, alternatives);
4307 }
4308 tree.type = result = t;
4309 }
4310
4311 public void visitTypeIntersection(JCTypeIntersection tree) {
4312 attribTypes(tree.bounds, env);
4313 tree.type = result = checkIntersection(tree, tree.bounds);
4314 }
4315
4316 public void visitTypeParameter(JCTypeParameter tree) {
4317 TypeVar typeVar = (TypeVar) tree.type;
4318
4319 if (tree.annotations != null && tree.annotations.nonEmpty()) {
4320 annotate.annotateTypeParameterSecondStage(tree, tree.annotations);
4321 }
4322
4323 if (!typeVar.bound.isErroneous()) {
4324 //fixup type-parameter bound computed in 'attribTypeVariables'
4325 typeVar.bound = checkIntersection(tree, tree.bounds);
4326 }
4327 }
4328
4329 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
4330 Set<Type> boundSet = new HashSet<>();
4331 if (bounds.nonEmpty()) {
4332 // accept class or interface or typevar as first bound.
4333 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4334 boundSet.add(types.erasure(bounds.head.type));
4335 if (bounds.head.type.isErroneous()) {
4336 return bounds.head.type;
4337 }
4338 else if (bounds.head.type.hasTag(TYPEVAR)) {
4339 // if first bound was a typevar, do not accept further bounds.
4340 if (bounds.tail.nonEmpty()) {
4341 log.error(bounds.tail.head.pos(),
4342 Errors.TypeVarMayNotBeFollowedByOtherBounds);
4343 return bounds.head.type;
4344 }
4345 } else {
4346 // if first bound was a class or interface, accept only interfaces
4347 // as further bounds.
4348 for (JCExpression bound : bounds.tail) {
4349 bound.type = checkBase(bound.type, bound, env, false, true, false);
4350 if (bound.type.isErroneous()) {
4351 bounds = List.of(bound);
4352 }
4353 else if (bound.type.hasTag(CLASS)) {
4354 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4355 }
4356 }
4357 }
4358 }
4359
4360 if (bounds.length() == 0) {
4361 return syms.objectType;
4362 } else if (bounds.length() == 1) {
4363 return bounds.head.type;
4364 } else {
4365 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
4366 // ... the variable's bound is a class type flagged COMPOUND
4367 // (see comment for TypeVar.bound).
4368 // In this case, generate a class tree that represents the
4369 // bound class, ...
4370 JCExpression extending;
4371 List<JCExpression> implementing;
4372 if (!bounds.head.type.isInterface()) {
4373 extending = bounds.head;
4374 implementing = bounds.tail;
4375 } else {
4376 extending = null;
4377 implementing = bounds;
4378 }
4379 JCClassDecl cd = make.at(tree).ClassDef(
4380 make.Modifiers(PUBLIC | ABSTRACT),
4381 names.empty, List.nil(),
4382 extending, implementing, List.nil());
4383
4384 ClassSymbol c = (ClassSymbol)owntype.tsym;
4385 Assert.check((c.flags() & COMPOUND) != 0);
4386 cd.sym = c;
4387 c.sourcefile = env.toplevel.sourcefile;
4388
4389 // ... and attribute the bound class
4390 c.flags_field |= UNATTRIBUTED;
4391 Env<AttrContext> cenv = enter.classEnv(cd, env);
4392 typeEnvs.put(c, cenv);
4393 attribClass(c);
4394 return owntype;
4395 }
4396 }
4397
4398 public void visitWildcard(JCWildcard tree) {
4399 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4400 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4401 ? syms.objectType
4402 : attribType(tree.inner, env);
4403 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4404 tree.kind.kind,
4405 syms.boundClass),
4406 KindSelector.TYP, resultInfo);
4407 }
4408
4409 public void visitAnnotation(JCAnnotation tree) {
4410 Assert.error("should be handled in annotate");
4411 }
4412
4413 public void visitAnnotatedType(JCAnnotatedType tree) {
4414 attribAnnotationTypes(tree.annotations, env);
4415 Type underlyingType = attribType(tree.underlyingType, env);
4416 Type annotatedType = underlyingType.annotatedType(Annotations.TO_BE_SET);
4417
4418 if (!env.info.isNewClass)
4419 annotate.annotateTypeSecondStage(tree, tree.annotations, annotatedType);
4420 result = tree.type = annotatedType;
4421 }
4422
4423 public void visitErroneous(JCErroneous tree) {
4424 if (tree.errs != null)
4425 for (JCTree err : tree.errs)
4426 attribTree(err, env, new ResultInfo(KindSelector.ERR, pt()));
4427 result = tree.type = syms.errType;
4428 }
4429
4430 /** Default visitor method for all other trees.
4431 */
4432 public void visitTree(JCTree tree) {
4433 throw new AssertionError();
4434 }
4435
4436 /**
4437 * Attribute an env for either a top level tree or class or module declaration.
4438 */
4439 public void attrib(Env<AttrContext> env) {
4440 switch (env.tree.getTag()) {
4441 case MODULEDEF:
4442 attribModule(env.tree.pos(), ((JCModuleDecl)env.tree).sym);
4443 break;
4444 case TOPLEVEL:
4445 attribTopLevel(env);
4446 break;
4447 case PACKAGEDEF:
4448 attribPackage(env.tree.pos(), ((JCPackageDecl) env.tree).packge);
4449 break;
4450 default:
4451 attribClass(env.tree.pos(), env.enclClass.sym);
4452 }
4453 }
4454
4455 /**
4456 * Attribute a top level tree. These trees are encountered when the
4457 * package declaration has annotations.
4458 */
4459 public void attribTopLevel(Env<AttrContext> env) {
4460 JCCompilationUnit toplevel = env.toplevel;
4461 try {
4462 annotate.flush();
4463 } catch (CompletionFailure ex) {
4464 chk.completionError(toplevel.pos(), ex);
4465 }
4466 }
4467
4468 public void attribPackage(DiagnosticPosition pos, PackageSymbol p) {
4469 try {
4470 annotate.flush();
4471 attribPackage(p);
4472 } catch (CompletionFailure ex) {
4473 chk.completionError(pos, ex);
4474 }
4475 }
4476
4477 void attribPackage(PackageSymbol p) {
4478 Env<AttrContext> env = typeEnvs.get(p);
4479 chk.checkDeprecatedAnnotation(((JCPackageDecl) env.tree).pid.pos(), p);
4480 }
4481
4482 public void attribModule(DiagnosticPosition pos, ModuleSymbol m) {
4483 try {
4484 annotate.flush();
4485 attribModule(m);
4486 } catch (CompletionFailure ex) {
4487 chk.completionError(pos, ex);
4488 }
4489 }
4490
4491 void attribModule(ModuleSymbol m) {
4492 // Get environment current at the point of module definition.
4493 Env<AttrContext> env = enter.typeEnvs.get(m);
4494 attribStat(env.tree, env);
4495 }
4496
4497 /** Main method: attribute class definition associated with given class symbol.
4498 * reporting completion failures at the given position.
4499 * @param pos The source position at which completion errors are to be
4500 * reported.
4501 * @param c The class symbol whose definition will be attributed.
4502 */
4503 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4504 try {
4505 annotate.flush();
4506 attribClass(c);
4507 } catch (CompletionFailure ex) {
4508 chk.completionError(pos, ex);
4509 }
4510 }
4511
4512 /** Attribute class definition associated with given class symbol.
4513 * @param c The class symbol whose definition will be attributed.
4514 */
4515 void attribClass(ClassSymbol c) throws CompletionFailure {
4516 if (c.type.hasTag(ERROR)) return;
4517
4518 // Check for cycles in the inheritance graph, which can arise from
4519 // ill-formed class files.
4520 chk.checkNonCyclic(null, c.type);
4521
4522 Type st = types.supertype(c.type);
4523 if ((c.flags_field & Flags.COMPOUND) == 0) {
4524 // First, attribute superclass.
4525 if (st.hasTag(CLASS))
4526 attribClass((ClassSymbol)st.tsym);
4527
4528 // Next attribute owner, if it is a class.
4529 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4530 attribClass((ClassSymbol)c.owner);
4531 }
4532
4533 // The previous operations might have attributed the current class
4534 // if there was a cycle. So we test first whether the class is still
4535 // UNATTRIBUTED.
4536 if ((c.flags_field & UNATTRIBUTED) != 0) {
4537 c.flags_field &= ~UNATTRIBUTED;
4538
4539 // Get environment current at the point of class definition.
4540 Env<AttrContext> env = typeEnvs.get(c);
4541
4542 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
4543 // because the annotations were not available at the time the env was created. Therefore,
4544 // we look up the environment chain for the first enclosing environment for which the
4545 // lint value is set. Typically, this is the parent env, but might be further if there
4546 // are any envs created as a result of TypeParameter nodes.
4547 Env<AttrContext> lintEnv = env;
4548 while (lintEnv.info.lint == null)
4549 lintEnv = lintEnv.next;
4550
4551 // Having found the enclosing lint value, we can initialize the lint value for this class
4552 env.info.lint = lintEnv.info.lint.augment(c);
4553
4554 Lint prevLint = chk.setLint(env.info.lint);
4555 JavaFileObject prev = log.useSource(c.sourcefile);
4556 ResultInfo prevReturnRes = env.info.returnResult;
4557
4558 try {
4559 deferredLintHandler.flush(env.tree);
4560 env.info.returnResult = null;
4561 // java.lang.Enum may not be subclassed by a non-enum
4562 if (st.tsym == syms.enumSym &&
4563 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4564 log.error(env.tree.pos(), Errors.EnumNoSubclassing);
4565
4566 // Enums may not be extended by source-level classes
4567 if (st.tsym != null &&
4568 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4569 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4570 log.error(env.tree.pos(), Errors.EnumTypesNotExtensible);
4571 }
4572
4573 if (isSerializable(c.type)) {
4574 env.info.isSerializable = true;
4575 }
4576
4577 attribClassBody(env, c);
4578
4579 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4580 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4581 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4582 chk.checkLeaksNotAccessible(env, (JCClassDecl) env.tree);
4583 } finally {
4584 env.info.returnResult = prevReturnRes;
4585 log.useSource(prev);
4586 chk.setLint(prevLint);
4587 }
4588
4589 }
4590 }
4591
4592 public void visitImport(JCImport tree) {
4593 // nothing to do
4594 }
4595
4596 public void visitModuleDef(JCModuleDecl tree) {
4597 tree.sym.completeUsesProvides();
4598 ModuleSymbol msym = tree.sym;
4599 Lint lint = env.outer.info.lint = env.outer.info.lint.augment(msym);
4600 Lint prevLint = chk.setLint(lint);
4601 chk.checkModuleName(tree);
4602 chk.checkDeprecatedAnnotation(tree, msym);
4603
4604 try {
4605 deferredLintHandler.flush(tree.pos());
4606 } finally {
4607 chk.setLint(prevLint);
4608 }
4609 }
4610
4611 /** Finish the attribution of a class. */
4612 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4613 JCClassDecl tree = (JCClassDecl)env.tree;
4614 Assert.check(c == tree.sym);
4615
4616 // Validate type parameters, supertype and interfaces.
4617 attribStats(tree.typarams, env);
4618 if (!c.isAnonymous()) {
4619 //already checked if anonymous
4620 chk.validate(tree.typarams, env);
4621 chk.validate(tree.extending, env);
4622 chk.validate(tree.implementing, env);
4623 }
4624
4625 c.markAbstractIfNeeded(types);
4626
4627 // If this is a non-abstract class, check that it has no abstract
4628 // methods or unimplemented methods of an implemented interface.
4629 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4630 chk.checkAllDefined(tree.pos(), c);
4631 }
4632
4633 if ((c.flags() & ANNOTATION) != 0) {
4634 if (tree.implementing.nonEmpty())
4635 log.error(tree.implementing.head.pos(),
4636 Errors.CantExtendIntfAnnotation);
4637 if (tree.typarams.nonEmpty()) {
4638 log.error(tree.typarams.head.pos(),
4639 Errors.IntfAnnotationCantHaveTypeParams(c));
4640 }
4641
4642 // If this annotation type has a @Repeatable, validate
4643 Attribute.Compound repeatable = c.getAnnotationTypeMetadata().getRepeatable();
4644 // If this annotation type has a @Repeatable, validate
4645 if (repeatable != null) {
4646 // get diagnostic position for error reporting
4647 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4648 Assert.checkNonNull(cbPos);
4649
4650 chk.validateRepeatable(c, repeatable, cbPos);
4651 }
4652 } else {
4653 // Check that all extended classes and interfaces
4654 // are compatible (i.e. no two define methods with same arguments
4655 // yet different return types). (JLS 8.4.6.3)
4656 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4657 if (allowDefaultMethods) {
4658 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4659 }
4660 }
4661
4662 // Check that class does not import the same parameterized interface
4663 // with two different argument lists.
4664 chk.checkClassBounds(tree.pos(), c.type);
4665
4666 tree.type = c.type;
4667
4668 for (List<JCTypeParameter> l = tree.typarams;
4669 l.nonEmpty(); l = l.tail) {
4670 Assert.checkNonNull(env.info.scope.findFirst(l.head.name));
4671 }
4672
4673 // Check that a generic class doesn't extend Throwable
4674 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4675 log.error(tree.extending.pos(), Errors.GenericThrowable);
4676
4677 // Check that all methods which implement some
4678 // method conform to the method they implement.
4679 chk.checkImplementations(tree);
4680
4681 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4682 checkAutoCloseable(tree.pos(), env, c.type);
4683
4684 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4685 // Attribute declaration
4686 attribStat(l.head, env);
4687 // Check that declarations in inner classes are not static (JLS 8.1.2)
4688 // Make an exception for static constants.
4689 if (c.owner.kind != PCK &&
4690 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4691 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4692 Symbol sym = null;
4693 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4694 if (sym == null ||
4695 sym.kind != VAR ||
4696 ((VarSymbol) sym).getConstValue() == null)
4697 log.error(l.head.pos(), Errors.IclsCantHaveStaticDecl(c));
4698 }
4699 }
4700
4701 // Check for cycles among non-initial constructors.
4702 chk.checkCyclicConstructors(tree);
4703
4704 // Check for cycles among annotation elements.
4705 chk.checkNonCyclicElements(tree);
4706
4707 // Check for proper use of serialVersionUID
4708 if (env.info.lint.isEnabled(LintCategory.SERIAL)
4709 && isSerializable(c.type)
4710 && (c.flags() & (Flags.ENUM | Flags.INTERFACE)) == 0
4711 && !c.isAnonymous()) {
4712 checkSerialVersionUID(tree, c);
4713 }
4714 if (allowTypeAnnos) {
4715 // Correctly organize the postions of the type annotations
4716 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4717
4718 // Check type annotations applicability rules
4719 validateTypeAnnotations(tree, false);
4720 }
4721 }
4722 // where
4723 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4724 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4725 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4726 if (types.isSameType(al.head.annotationType.type, t))
4727 return al.head.pos();
4728 }
4729
4730 return null;
4731 }
4732
4733 /** check if a type is a subtype of Serializable, if that is available. */
4734 boolean isSerializable(Type t) {
4735 try {
4736 syms.serializableType.complete();
4737 }
4738 catch (CompletionFailure e) {
4739 return false;
4740 }
4741 return types.isSubtype(t, syms.serializableType);
4742 }
4743
4744 /** Check that an appropriate serialVersionUID member is defined. */
4745 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4746
4747 // check for presence of serialVersionUID
4748 VarSymbol svuid = null;
4749 for (Symbol sym : c.members().getSymbolsByName(names.serialVersionUID)) {
4750 if (sym.kind == VAR) {
4751 svuid = (VarSymbol)sym;
4752 break;
4753 }
4754 }
4755
4756 if (svuid == null) {
4757 log.warning(LintCategory.SERIAL,
4758 tree.pos(), Warnings.MissingSVUID(c));
4759 return;
4760 }
4761
4762 // check that it is static final
4763 if ((svuid.flags() & (STATIC | FINAL)) !=
4764 (STATIC | FINAL))
4765 log.warning(LintCategory.SERIAL,
4766 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ImproperSVUID(c));
4767
4768 // check that it is long
4769 else if (!svuid.type.hasTag(LONG))
4770 log.warning(LintCategory.SERIAL,
4771 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.LongSVUID(c));
4772
4773 // check constant
4774 else if (svuid.getConstValue() == null)
4775 log.warning(LintCategory.SERIAL,
4776 TreeInfo.diagnosticPositionFor(svuid, tree), Warnings.ConstantSVUID(c));
4777 }
4778
4779 private Type capture(Type type) {
4780 return types.capture(type);
4781 }
4782
4783 private void setSyntheticVariableType(JCVariableDecl tree, Type type) {
4784 if (type.isErroneous()) {
4785 tree.vartype = make.at(Position.NOPOS).Erroneous();
4786 } else {
4787 tree.vartype = make.at(Position.NOPOS).Type(type);
4788 }
4789 }
4790
4791 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4792 tree.accept(new TypeAnnotationsValidator(sigOnly));
4793 }
4794 //where
4795 private final class TypeAnnotationsValidator extends TreeScanner {
4796
4797 private final boolean sigOnly;
4798 public TypeAnnotationsValidator(boolean sigOnly) {
4799 this.sigOnly = sigOnly;
4800 }
4801
4802 public void visitAnnotation(JCAnnotation tree) {
4803 chk.validateTypeAnnotation(tree, false);
4804 super.visitAnnotation(tree);
4805 }
4806 public void visitAnnotatedType(JCAnnotatedType tree) {
4807 if (!tree.underlyingType.type.isErroneous()) {
4808 super.visitAnnotatedType(tree);
4809 }
4810 }
4811 public void visitTypeParameter(JCTypeParameter tree) {
4812 chk.validateTypeAnnotations(tree.annotations, true);
4813 scan(tree.bounds);
4814 // Don't call super.
4815 // This is needed because above we call validateTypeAnnotation with
4816 // false, which would forbid annotations on type parameters.
4817 // super.visitTypeParameter(tree);
4818 }
4819 public void visitMethodDef(JCMethodDecl tree) {
4820 if (tree.recvparam != null &&
4821 !tree.recvparam.vartype.type.isErroneous()) {
4822 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4823 tree.recvparam.vartype.type.tsym);
4824 }
4825 if (tree.restype != null && tree.restype.type != null) {
4826 validateAnnotatedType(tree.restype, tree.restype.type);
4827 }
4828 if (sigOnly) {
4829 scan(tree.mods);
4830 scan(tree.restype);
4831 scan(tree.typarams);
4832 scan(tree.recvparam);
4833 scan(tree.params);
4834 scan(tree.thrown);
4835 } else {
4836 scan(tree.defaultValue);
4837 scan(tree.body);
4838 }
4839 }
4840 public void visitVarDef(final JCVariableDecl tree) {
4841 //System.err.println("validateTypeAnnotations.visitVarDef " + tree);
4842 if (tree.sym != null && tree.sym.type != null && !tree.isImplicitlyTyped())
4843 validateAnnotatedType(tree.vartype, tree.sym.type);
4844 scan(tree.mods);
4845 scan(tree.vartype);
4846 if (!sigOnly) {
4847 scan(tree.init);
4848 }
4849 }
4850 public void visitTypeCast(JCTypeCast tree) {
4851 if (tree.clazz != null && tree.clazz.type != null)
4852 validateAnnotatedType(tree.clazz, tree.clazz.type);
4853 super.visitTypeCast(tree);
4854 }
4855 public void visitTypeTest(JCInstanceOf tree) {
4856 if (tree.clazz != null && tree.clazz.type != null)
4857 validateAnnotatedType(tree.clazz, tree.clazz.type);
4858 super.visitTypeTest(tree);
4859 }
4860 public void visitNewClass(JCNewClass tree) {
4861 if (tree.clazz != null && tree.clazz.type != null) {
4862 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4863 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4864 tree.clazz.type.tsym);
4865 }
4866 if (tree.def != null) {
4867 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4868 }
4869
4870 validateAnnotatedType(tree.clazz, tree.clazz.type);
4871 }
4872 super.visitNewClass(tree);
4873 }
4874 public void visitNewArray(JCNewArray tree) {
4875 if (tree.elemtype != null && tree.elemtype.type != null) {
4876 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4877 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4878 tree.elemtype.type.tsym);
4879 }
4880 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4881 }
4882 super.visitNewArray(tree);
4883 }
4884 public void visitClassDef(JCClassDecl tree) {
4885 //System.err.println("validateTypeAnnotations.visitClassDef " + tree);
4886 if (sigOnly) {
4887 scan(tree.mods);
4888 scan(tree.typarams);
4889 scan(tree.extending);
4890 scan(tree.implementing);
4891 }
4892 for (JCTree member : tree.defs) {
4893 if (member.hasTag(Tag.CLASSDEF)) {
4894 continue;
4895 }
4896 scan(member);
4897 }
4898 }
4899 public void visitBlock(JCBlock tree) {
4900 if (!sigOnly) {
4901 scan(tree.stats);
4902 }
4903 }
4904
4905 /* I would want to model this after
4906 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4907 * and override visitSelect and visitTypeApply.
4908 * However, we only set the annotated type in the top-level type
4909 * of the symbol.
4910 * Therefore, we need to override each individual location where a type
4911 * can occur.
4912 */
4913 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4914 //System.err.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4915
4916 if (type.isPrimitiveOrVoid()) {
4917 return;
4918 }
4919
4920 JCTree enclTr = errtree;
4921 Type enclTy = type;
4922
4923 boolean repeat = true;
4924 while (repeat) {
4925 if (enclTr.hasTag(TYPEAPPLY)) {
4926 List<Type> tyargs = enclTy.getTypeArguments();
4927 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4928 if (trargs.length() > 0) {
4929 // Nothing to do for diamonds
4930 if (tyargs.length() == trargs.length()) {
4931 for (int i = 0; i < tyargs.length(); ++i) {
4932 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4933 }
4934 }
4935 // If the lengths don't match, it's either a diamond
4936 // or some nested type that redundantly provides
4937 // type arguments in the tree.
4938 }
4939
4940 // Look at the clazz part of a generic type
4941 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4942 }
4943
4944 if (enclTr.hasTag(SELECT)) {
4945 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4946 if (enclTy != null &&
4947 !enclTy.hasTag(NONE)) {
4948 enclTy = enclTy.getEnclosingType();
4949 }
4950 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4951 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4952 if (enclTy == null || enclTy.hasTag(NONE)) {
4953 if (at.getAnnotations().size() == 1) {
4954 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping1(at.getAnnotations().head.attribute));
4955 } else {
4956 ListBuffer<Attribute.Compound> comps = new ListBuffer<>();
4957 for (JCAnnotation an : at.getAnnotations()) {
4958 comps.add(an.attribute);
4959 }
4960 log.error(at.underlyingType.pos(), Errors.CantTypeAnnotateScoping(comps.toList()));
4961 }
4962 repeat = false;
4963 }
4964 enclTr = at.underlyingType;
4965 // enclTy doesn't need to be changed
4966 } else if (enclTr.hasTag(IDENT)) {
4967 repeat = false;
4968 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4969 JCWildcard wc = (JCWildcard) enclTr;
4970 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD ||
4971 wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4972 validateAnnotatedType(wc.getBound(), wc.getBound().type);
4973 } else {
4974 // Nothing to do for UNBOUND
4975 }
4976 repeat = false;
4977 } else if (enclTr.hasTag(TYPEARRAY)) {
4978 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4979 validateAnnotatedType(art.getType(), art.elemtype.type);
4980 repeat = false;
4981 } else if (enclTr.hasTag(TYPEUNION)) {
4982 JCTypeUnion ut = (JCTypeUnion) enclTr;
4983 for (JCTree t : ut.getTypeAlternatives()) {
4984 validateAnnotatedType(t, t.type);
4985 }
4986 repeat = false;
4987 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4988 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4989 for (JCTree t : it.getBounds()) {
4990 validateAnnotatedType(t, t.type);
4991 }
4992 repeat = false;
4993 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4994 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4995 repeat = false;
4996 } else {
4997 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4998 " within: "+ errtree + " with kind: " + errtree.getKind());
4999 }
5000 }
5001 }
5002
5003 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
5004 Symbol sym) {
5005 // Ensure that no declaration annotations are present.
5006 // Note that a tree type might be an AnnotatedType with
5007 // empty annotations, if only declaration annotations were given.
5008 // This method will raise an error for such a type.
5009 for (JCAnnotation ai : annotations) {
5010 if (!ai.type.isErroneous() &&
5011 typeAnnotations.annotationTargetType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
5012 log.error(ai.pos(), Errors.AnnotationTypeNotApplicableToType(ai.type));
5013 }
5014 }
5015 }
5016 }
5017
5018 // <editor-fold desc="post-attribution visitor">
5019
5020 /**
5021 * Handle missing types/symbols in an AST. This routine is useful when
5022 * the compiler has encountered some errors (which might have ended up
5023 * terminating attribution abruptly); if the compiler is used in fail-over
5024 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
5025 * prevents NPE to be progagated during subsequent compilation steps.
5026 */
5027 public void postAttr(JCTree tree) {
5028 new PostAttrAnalyzer().scan(tree);
5029 }
5030
5031 class PostAttrAnalyzer extends TreeScanner {
5032
5033 private void initTypeIfNeeded(JCTree that) {
5034 if (that.type == null) {
5035 if (that.hasTag(METHODDEF)) {
5036 that.type = dummyMethodType((JCMethodDecl)that);
5037 } else {
5038 that.type = syms.unknownType;
5039 }
5040 }
5041 }
5042
5043 /* Construct a dummy method type. If we have a method declaration,
5044 * and the declared return type is void, then use that return type
5045 * instead of UNKNOWN to avoid spurious error messages in lambda
5046 * bodies (see:JDK-8041704).
5047 */
5048 private Type dummyMethodType(JCMethodDecl md) {
5049 Type restype = syms.unknownType;
5050 if (md != null && md.restype != null && md.restype.hasTag(TYPEIDENT)) {
5051 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
5052 if (prim.typetag == VOID)
5053 restype = syms.voidType;
5054 }
5055 return new MethodType(List.nil(), restype,
5056 List.nil(), syms.methodClass);
5057 }
5058 private Type dummyMethodType() {
5059 return dummyMethodType(null);
5060 }
5061
5062 @Override
5063 public void scan(JCTree tree) {
5064 if (tree == null) return;
5065 if (tree instanceof JCExpression) {
5066 initTypeIfNeeded(tree);
5067 }
5068 super.scan(tree);
5069 }
5070
5071 @Override
5072 public void visitIdent(JCIdent that) {
5073 if (that.sym == null) {
5074 that.sym = syms.unknownSymbol;
5075 }
5076 }
5077
5078 @Override
5079 public void visitSelect(JCFieldAccess that) {
5080 if (that.sym == null) {
5081 that.sym = syms.unknownSymbol;
5082 }
5083 super.visitSelect(that);
5084 }
5085
5086 @Override
5087 public void visitClassDef(JCClassDecl that) {
5088 initTypeIfNeeded(that);
5089 if (that.sym == null) {
5090 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
5091 }
5092 super.visitClassDef(that);
5093 }
5094
5095 @Override
5096 public void visitMethodDef(JCMethodDecl that) {
5097 initTypeIfNeeded(that);
5098 if (that.sym == null) {
5099 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
5100 }
5101 super.visitMethodDef(that);
5102 }
5103
5104 @Override
5105 public void visitVarDef(JCVariableDecl that) {
5106 initTypeIfNeeded(that);
5107 if (that.sym == null) {
5108 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
5109 that.sym.adr = 0;
5110 }
5111 if (that.vartype == null) {
5112 that.vartype = make.at(Position.NOPOS).Erroneous();
5113 }
5114 super.visitVarDef(that);
5115 }
5116
5117 @Override
5118 public void visitNewClass(JCNewClass that) {
5119 if (that.constructor == null) {
5120 that.constructor = new MethodSymbol(0, names.init,
5121 dummyMethodType(), syms.noSymbol);
5122 }
5123 if (that.constructorType == null) {
5124 that.constructorType = syms.unknownType;
5125 }
5126 super.visitNewClass(that);
5127 }
5128
5129 @Override
5130 public void visitAssignop(JCAssignOp that) {
5131 if (that.operator == null) {
5132 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5133 -1, syms.noSymbol);
5134 }
5135 super.visitAssignop(that);
5136 }
5137
5138 @Override
5139 public void visitBinary(JCBinary that) {
5140 if (that.operator == null) {
5141 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5142 -1, syms.noSymbol);
5143 }
5144 super.visitBinary(that);
5145 }
5146
5147 @Override
5148 public void visitUnary(JCUnary that) {
5149 if (that.operator == null) {
5150 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
5151 -1, syms.noSymbol);
5152 }
5153 super.visitUnary(that);
5154 }
5155
5156 @Override
5157 public void visitLambda(JCLambda that) {
5158 super.visitLambda(that);
5159 if (that.target == null) {
5160 that.target = syms.unknownType;
5161 }
5162 }
5163
5164 @Override
5165 public void visitReference(JCMemberReference that) {
5166 super.visitReference(that);
5167 if (that.sym == null) {
5168 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
5169 syms.noSymbol);
5170 }
5171 if (that.target == null) {
5172 that.target = syms.unknownType;
5173 }
5174 }
5175 }
5176 // </editor-fold>
5177
5178 public void setPackageSymbols(JCExpression pid, Symbol pkg) {
5179 new TreeScanner() {
5180 Symbol packge = pkg;
5181 @Override
5182 public void visitIdent(JCIdent that) {
5183 that.sym = packge;
5184 }
5185
5186 @Override
5187 public void visitSelect(JCFieldAccess that) {
5188 that.sym = packge;
5189 packge = packge.owner;
5190 super.visitSelect(that);
5191 }
5192 }.scan(pid);
5193 }
5194
5195 }