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