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