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