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