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