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