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