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