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