1 /*
2 * Copyright (c) 1999, 2013, 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.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
33
34 import com.sun.source.tree.IdentifierTree;
35 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
36 import com.sun.source.tree.MemberSelectTree;
37 import com.sun.source.tree.TreeVisitor;
38 import com.sun.source.util.SimpleTreeVisitor;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.code.Type.*;
43 import com.sun.tools.javac.comp.Check.CheckContext;
44 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
45 import com.sun.tools.javac.comp.Infer.InferenceContext;
46 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.tree.*;
49 import com.sun.tools.javac.tree.JCTree.*;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
53 import com.sun.tools.javac.util.List;
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Flags.ANNOTATION;
56 import static com.sun.tools.javac.code.Flags.BLOCK;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
59 import static com.sun.tools.javac.code.TypeTag.*;
60 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
61 import static com.sun.tools.javac.tree.JCTree.Tag.*;
62
63 /** This is the main context-dependent analysis phase in GJC. It
64 * encompasses name resolution, type checking and constant folding as
65 * subtasks. Some subtasks involve auxiliary classes.
66 * @see Check
67 * @see Resolve
68 * @see ConstFold
69 * @see Infer
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Attr extends JCTree.Visitor {
77 protected static final Context.Key<Attr> attrKey =
78 new Context.Key<Attr>();
79
80 final Names names;
81 final Log log;
82 final Symtab syms;
83 final Resolve rs;
84 final Infer infer;
85 final DeferredAttr deferredAttr;
86 final Check chk;
87 final Flow flow;
88 final MemberEnter memberEnter;
89 final TreeMaker make;
90 final ConstFold cfolder;
91 final Enter enter;
92 final Target target;
93 final Types types;
94 final JCDiagnostic.Factory diags;
95 final Annotate annotate;
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 deferredLintHandler = DeferredLintHandler.instance(context);
125
126 Options options = Options.instance(context);
127
128 Source source = Source.instance(context);
129 allowGenerics = source.allowGenerics();
130 allowVarargs = source.allowVarargs();
131 allowEnums = source.allowEnums();
132 allowBoxing = source.allowBoxing();
133 allowCovariantReturns = source.allowCovariantReturns();
134 allowAnonOuterThis = source.allowAnonOuterThis();
135 allowStringsInSwitch = source.allowStringsInSwitch();
136 allowPoly = source.allowPoly();
137 allowLambda = source.allowLambda();
138 allowDefaultMethods = source.allowDefaultMethods();
139 sourceName = source.name;
140 relax = (options.isSet("-retrofit") ||
141 options.isSet("-relax"));
142 findDiamonds = options.get("findDiamond") != null &&
143 source.allowDiamond();
144 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
145 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
146
147 statInfo = new ResultInfo(NIL, Type.noType);
148 varInfo = new ResultInfo(VAR, Type.noType);
149 unknownExprInfo = new ResultInfo(VAL, Type.noType);
150 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
151 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
152 }
153
154 /** Switch: relax some constraints for retrofit mode.
155 */
156 boolean relax;
157
158 /** Switch: support target-typing inference
159 */
160 boolean allowPoly;
161
162 /** Switch: support generics?
163 */
164 boolean allowGenerics;
165
166 /** Switch: allow variable-arity methods.
167 */
168 boolean allowVarargs;
169
170 /** Switch: support enums?
171 */
172 boolean allowEnums;
173
174 /** Switch: support boxing and unboxing?
175 */
176 boolean allowBoxing;
177
178 /** Switch: support covariant result types?
179 */
180 boolean allowCovariantReturns;
181
182 /** Switch: support lambda expressions ?
183 */
184 boolean allowLambda;
185
186 /** Switch: support default methods ?
187 */
188 boolean allowDefaultMethods;
189
190 /** Switch: allow references to surrounding object from anonymous
191 * objects during constructor call?
192 */
193 boolean allowAnonOuterThis;
194
195 /** Switch: generates a warning if diamond can be safely applied
196 * to a given new expression
197 */
198 boolean findDiamonds;
199
200 /**
201 * Internally enables/disables diamond finder feature
202 */
203 static final boolean allowDiamondFinder = true;
204
205 /**
206 * Switch: warn about use of variable before declaration?
207 * RFE: 6425594
208 */
209 boolean useBeforeDeclarationWarning;
210
211 /**
212 * Switch: generate warnings whenever an anonymous inner class that is convertible
213 * to a lambda expression is found
214 */
215 boolean identifyLambdaCandidate;
216
217 /**
218 * Switch: allow strings in switch?
219 */
220 boolean allowStringsInSwitch;
221
222 /**
223 * Switch: name of source level; used for error reporting.
224 */
225 String sourceName;
226
227 /** Check kind and type of given tree against protokind and prototype.
228 * If check succeeds, store type in tree and return it.
229 * If check fails, store errType in tree and return it.
230 * No checks are performed if the prototype is a method type.
231 * It is not necessary in this case since we know that kind and type
232 * are correct.
233 *
234 * @param tree The tree whose kind and type is checked
235 * @param ownkind The computed kind of the tree
236 * @param resultInfo The expected result of the tree
237 */
238 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
239 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
240 Type owntype = found;
241 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
242 if (inferenceContext.free(found)) {
243 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
244 @Override
245 public void typesInferred(InferenceContext inferenceContext) {
246 ResultInfo pendingResult =
247 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
248 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
249 }
250 });
251 return tree.type = resultInfo.pt;
252 } else {
253 if ((ownkind & ~resultInfo.pkind) == 0) {
254 owntype = resultInfo.check(tree, owntype);
255 } else {
256 log.error(tree.pos(), "unexpected.type",
257 kindNames(resultInfo.pkind),
258 kindName(ownkind));
259 owntype = types.createErrorType(owntype);
260 }
261 }
262 }
263 tree.type = owntype;
264 return owntype;
265 }
266
267 /** Is given blank final variable assignable, i.e. in a scope where it
268 * may be assigned to even though it is final?
269 * @param v The blank final variable.
270 * @param env The current environment.
271 */
272 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
273 Symbol owner = owner(env);
274 // owner refers to the innermost variable, method or
275 // initializer block declaration at this point.
276 return
277 v.owner == owner
278 ||
279 ((owner.name == names.init || // i.e. we are in a constructor
280 owner.kind == VAR || // i.e. we are in a variable initializer
281 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
282 &&
283 v.owner == owner.owner
284 &&
285 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
286 }
287
288 /**
289 * Return the innermost enclosing owner symbol in a given attribution context
290 */
291 Symbol owner(Env<AttrContext> env) {
292 while (true) {
293 switch (env.tree.getTag()) {
294 case VARDEF:
295 //a field can be owner
296 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
297 if (vsym.owner.kind == TYP) {
298 return vsym;
299 }
300 break;
301 case METHODDEF:
302 //method def is always an owner
303 return ((JCMethodDecl)env.tree).sym;
304 case CLASSDEF:
305 //class def is always an owner
306 return ((JCClassDecl)env.tree).sym;
307 case LAMBDA:
308 //a lambda is an owner - return a fresh synthetic method symbol
309 return new MethodSymbol(0, names.empty, null, syms.methodClass);
310 case BLOCK:
311 //static/instance init blocks are owner
312 Symbol blockSym = env.info.scope.owner;
313 if ((blockSym.flags() & BLOCK) != 0) {
314 return blockSym;
315 }
316 break;
317 case TOPLEVEL:
318 //toplevel is always an owner (for pkge decls)
319 return env.info.scope.owner;
320 }
321 Assert.checkNonNull(env.next);
322 env = env.next;
323 }
324 }
325
326 /** Check that variable can be assigned to.
327 * @param pos The current source code position.
328 * @param v The assigned varaible
329 * @param base If the variable is referred to in a Select, the part
330 * to the left of the `.', null otherwise.
331 * @param env The current environment.
332 */
333 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
334 if ((v.flags() & FINAL) != 0 &&
335 ((v.flags() & HASINIT) != 0
336 ||
337 !((base == null ||
338 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
339 isAssignableAsBlankFinal(v, env)))) {
340 if (v.isResourceVariable()) { //TWR resource
341 log.error(pos, "try.resource.may.not.be.assigned", v);
342 } else {
343 log.error(pos, "cant.assign.val.to.final.var", v);
344 }
345 }
346 }
347
348 /** Does tree represent a static reference to an identifier?
349 * It is assumed that tree is either a SELECT or an IDENT.
350 * We have to weed out selects from non-type names here.
351 * @param tree The candidate tree.
352 */
353 boolean isStaticReference(JCTree tree) {
354 if (tree.hasTag(SELECT)) {
355 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
356 if (lsym == null || lsym.kind != TYP) {
357 return false;
358 }
359 }
360 return true;
361 }
362
363 /** Is this symbol a type?
364 */
365 static boolean isType(Symbol sym) {
366 return sym != null && sym.kind == TYP;
367 }
368
369 /** The current `this' symbol.
370 * @param env The current environment.
371 */
372 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
373 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
374 }
375
376 /** Attribute a parsed identifier.
377 * @param tree Parsed identifier name
378 * @param topLevel The toplevel to use
379 */
380 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
381 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
382 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
383 syms.errSymbol.name,
384 null, null, null, null);
385 localEnv.enclClass.sym = syms.errSymbol;
386 return tree.accept(identAttributer, localEnv);
387 }
388 // where
389 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
390 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
391 @Override
392 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
393 Symbol site = visit(node.getExpression(), env);
394 if (site.kind == ERR)
395 return site;
396 Name name = (Name)node.getIdentifier();
397 if (site.kind == PCK) {
398 env.toplevel.packge = (PackageSymbol)site;
399 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
400 } else {
401 env.enclClass.sym = (ClassSymbol)site;
402 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
403 }
404 }
405
406 @Override
407 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
408 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
409 }
410 }
411
412 public Type coerce(Type etype, Type ttype) {
413 return cfolder.coerce(etype, ttype);
414 }
415
416 public Type attribType(JCTree node, TypeSymbol sym) {
417 Env<AttrContext> env = enter.typeEnvs.get(sym);
418 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
419 return attribTree(node, localEnv, unknownTypeInfo);
420 }
421
422 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
423 // Attribute qualifying package or class.
424 JCFieldAccess s = (JCFieldAccess)tree.qualid;
425 return attribTree(s.selected,
426 env,
427 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
428 Type.noType));
429 }
430
431 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
432 breakTree = tree;
433 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
434 try {
435 attribExpr(expr, env);
436 } catch (BreakAttr b) {
437 return b.env;
438 } catch (AssertionError ae) {
439 if (ae.getCause() instanceof BreakAttr) {
440 return ((BreakAttr)(ae.getCause())).env;
441 } else {
442 throw ae;
443 }
444 } finally {
445 breakTree = null;
446 log.useSource(prev);
447 }
448 return env;
449 }
450
451 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
452 breakTree = tree;
453 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
454 try {
455 attribStat(stmt, env);
456 } catch (BreakAttr b) {
457 return b.env;
458 } catch (AssertionError ae) {
459 if (ae.getCause() instanceof BreakAttr) {
460 return ((BreakAttr)(ae.getCause())).env;
461 } else {
462 throw ae;
463 }
464 } finally {
465 breakTree = null;
466 log.useSource(prev);
467 }
468 return env;
469 }
470
471 private JCTree breakTree = null;
472
473 private static class BreakAttr extends RuntimeException {
474 static final long serialVersionUID = -6924771130405446405L;
475 private Env<AttrContext> env;
476 private BreakAttr(Env<AttrContext> env) {
477 this.env = copyEnv(env);
478 }
479
480 private Env<AttrContext> copyEnv(Env<AttrContext> env) {
481 Env<AttrContext> newEnv =
482 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
483 if (newEnv.outer != null) {
484 newEnv.outer = copyEnv(newEnv.outer);
485 }
486 return newEnv;
487 }
488
489 private Scope copyScope(Scope sc) {
490 Scope newScope = new Scope(sc.owner);
491 List<Symbol> elemsList = List.nil();
492 while (sc != null) {
493 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
494 elemsList = elemsList.prepend(e.sym);
495 }
496 sc = sc.next;
497 }
498 for (Symbol s : elemsList) {
499 newScope.enter(s);
500 }
501 return newScope;
502 }
503 }
504
505 class ResultInfo {
506 final int pkind;
507 final Type pt;
508 final CheckContext checkContext;
509
510 ResultInfo(int pkind, Type pt) {
511 this(pkind, pt, chk.basicHandler);
512 }
513
514 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
515 this.pkind = pkind;
516 this.pt = pt;
517 this.checkContext = checkContext;
518 }
519
520 protected Type check(final DiagnosticPosition pos, final Type found) {
521 return chk.checkType(pos, found, pt, checkContext);
522 }
523
524 protected ResultInfo dup(Type newPt) {
525 return new ResultInfo(pkind, newPt, checkContext);
526 }
527
528 protected ResultInfo dup(CheckContext newContext) {
529 return new ResultInfo(pkind, pt, newContext);
530 }
531 }
532
533 class RecoveryInfo extends ResultInfo {
534
535 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
536 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
537 @Override
538 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
539 return deferredAttrContext;
540 }
541 @Override
542 public boolean compatible(Type found, Type req, Warner warn) {
543 return true;
544 }
545 @Override
546 public void report(DiagnosticPosition pos, JCDiagnostic details) {
547 chk.basicHandler.report(pos, details);
548 }
549 });
550 }
551
552 @Override
553 protected Type check(DiagnosticPosition pos, Type found) {
554 return chk.checkNonVoid(pos, super.check(pos, found));
555 }
556 }
557
558 final ResultInfo statInfo;
559 final ResultInfo varInfo;
560 final ResultInfo unknownExprInfo;
561 final ResultInfo unknownTypeInfo;
562 final ResultInfo recoveryInfo;
563
564 Type pt() {
565 return resultInfo.pt;
566 }
567
568 int pkind() {
569 return resultInfo.pkind;
570 }
571
572 /* ************************************************************************
573 * Visitor methods
574 *************************************************************************/
575
576 /** Visitor argument: the current environment.
577 */
578 Env<AttrContext> env;
579
580 /** Visitor argument: the currently expected attribution result.
581 */
582 ResultInfo resultInfo;
583
584 /** Visitor result: the computed type.
585 */
586 Type result;
587
588 /** Visitor method: attribute a tree, catching any completion failure
589 * exceptions. Return the tree's type.
590 *
591 * @param tree The tree to be visited.
592 * @param env The environment visitor argument.
593 * @param resultInfo The result info visitor argument.
594 */
595 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
596 Env<AttrContext> prevEnv = this.env;
597 ResultInfo prevResult = this.resultInfo;
598 try {
599 this.env = env;
600 this.resultInfo = resultInfo;
601 tree.accept(this);
602 if (tree == breakTree &&
603 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
604 throw new BreakAttr(env);
605 }
606 return result;
607 } catch (CompletionFailure ex) {
608 tree.type = syms.errType;
609 return chk.completionError(tree.pos(), ex);
610 } finally {
611 this.env = prevEnv;
612 this.resultInfo = prevResult;
613 }
614 }
615
616 /** Derived visitor method: attribute an expression tree.
617 */
618 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
619 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
620 }
621
622 /** Derived visitor method: attribute an expression tree with
623 * no constraints on the computed type.
624 */
625 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
626 return attribTree(tree, env, unknownExprInfo);
627 }
628
629 /** Derived visitor method: attribute a type tree.
630 */
631 public Type attribType(JCTree tree, Env<AttrContext> env) {
632 Type result = attribType(tree, env, Type.noType);
633 return result;
634 }
635
636 /** Derived visitor method: attribute a type tree.
637 */
638 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
639 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
640 return result;
641 }
642
643 /** Derived visitor method: attribute a statement or definition tree.
644 */
645 public Type attribStat(JCTree tree, Env<AttrContext> env) {
646 return attribTree(tree, env, statInfo);
647 }
648
649 /** Attribute a list of expressions, returning a list of types.
650 */
651 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
652 ListBuffer<Type> ts = new ListBuffer<Type>();
653 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
654 ts.append(attribExpr(l.head, env, pt));
655 return ts.toList();
656 }
657
658 /** Attribute a list of statements, returning nothing.
659 */
660 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
661 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
662 attribStat(l.head, env);
663 }
664
665 /** Attribute the arguments in a method call, returning a list of types.
666 */
667 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
668 ListBuffer<Type> argtypes = new ListBuffer<Type>();
669 for (JCExpression arg : trees) {
670 Type argtype = allowPoly && TreeInfo.isPoly(arg, env.tree) ?
671 deferredAttr.new DeferredType(arg, env) :
672 chk.checkNonVoid(arg, attribExpr(arg, env, Infer.anyPoly));
673 argtypes.append(argtype);
674 }
675 return argtypes.toList();
676 }
677
678 /** Attribute a type argument list, returning a list of types.
679 * Caller is responsible for calling checkRefTypes.
680 */
681 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
682 ListBuffer<Type> argtypes = new ListBuffer<Type>();
683 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
684 argtypes.append(attribType(l.head, env));
685 return argtypes.toList();
686 }
687
688 /** Attribute a type argument list, returning a list of types.
689 * Check that all the types are references.
690 */
691 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
692 List<Type> types = attribAnyTypes(trees, env);
693 return chk.checkRefTypes(trees, types);
694 }
695
696 /**
697 * Attribute type variables (of generic classes or methods).
698 * Compound types are attributed later in attribBounds.
699 * @param typarams the type variables to enter
700 * @param env the current environment
701 */
702 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
703 for (JCTypeParameter tvar : typarams) {
704 TypeVar a = (TypeVar)tvar.type;
705 a.tsym.flags_field |= UNATTRIBUTED;
706 a.bound = Type.noType;
707 if (!tvar.bounds.isEmpty()) {
708 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
709 for (JCExpression bound : tvar.bounds.tail)
710 bounds = bounds.prepend(attribType(bound, env));
711 types.setBounds(a, bounds.reverse());
712 } else {
713 // if no bounds are given, assume a single bound of
714 // java.lang.Object.
715 types.setBounds(a, List.of(syms.objectType));
716 }
717 a.tsym.flags_field &= ~UNATTRIBUTED;
718 }
719 for (JCTypeParameter tvar : typarams) {
720 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
721 }
722 }
723
724 /**
725 * Attribute the type references in a list of annotations.
726 */
727 void attribAnnotationTypes(List<JCAnnotation> annotations,
728 Env<AttrContext> env) {
729 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
730 JCAnnotation a = al.head;
731 attribType(a.annotationType, env);
732 }
733 }
734
735 /**
736 * Attribute a "lazy constant value".
737 * @param env The env for the const value
738 * @param initializer The initializer for the const value
739 * @param type The expected type, or null
740 * @see VarSymbol#setLazyConstValue
741 */
742 public Object attribLazyConstantValue(Env<AttrContext> env,
743 JCTree.JCExpression initializer,
744 Type type) {
745
746 // in case no lint value has been set up for this env, scan up
747 // env stack looking for smallest enclosing env for which it is set.
748 Env<AttrContext> lintEnv = env;
749 while (lintEnv.info.lint == null)
750 lintEnv = lintEnv.next;
751
752 // Having found the enclosing lint value, we can initialize the lint value for this class
753 // ... but ...
754 // There's a problem with evaluating annotations in the right order, such that
755 // env.info.enclVar.attributes_field might not yet have been evaluated, and so might be
756 // null. In that case, calling augment will throw an NPE. To avoid this, for now we
757 // revert to the jdk 6 behavior and ignore the (unevaluated) attributes.
758 if (env.info.enclVar.annotations.pendingCompletion()) {
759 env.info.lint = lintEnv.info.lint;
760 } else {
761 env.info.lint = lintEnv.info.lint.augment(env.info.enclVar.annotations,
762 env.info.enclVar.flags());
763 }
764
765 Lint prevLint = chk.setLint(env.info.lint);
766 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
767
768 try {
769 memberEnter.typeAnnotate(initializer, env, env.info.enclVar);
770 annotate.flush();
771 Type itype = attribExpr(initializer, env, type);
772 if (itype.constValue() != null)
773 return coerce(itype, type).constValue();
774 else
775 return null;
776 } finally {
777 env.info.lint = prevLint;
778 log.useSource(prevSource);
779 }
780 }
781
782 /** Attribute type reference in an `extends' or `implements' clause.
783 * Supertypes of anonymous inner classes are usually already attributed.
784 *
785 * @param tree The tree making up the type reference.
786 * @param env The environment current at the reference.
787 * @param classExpected true if only a class is expected here.
788 * @param interfaceExpected true if only an interface is expected here.
789 */
790 Type attribBase(JCTree tree,
791 Env<AttrContext> env,
792 boolean classExpected,
793 boolean interfaceExpected,
794 boolean checkExtensible) {
795 Type t = tree.type != null ?
796 tree.type :
797 attribType(tree, env);
798 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
799 }
800 Type checkBase(Type t,
801 JCTree tree,
802 Env<AttrContext> env,
803 boolean classExpected,
804 boolean interfaceExpected,
805 boolean checkExtensible) {
806 if (t.isErroneous())
807 return t;
808 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
809 // check that type variable is already visible
810 if (t.getUpperBound() == null) {
811 log.error(tree.pos(), "illegal.forward.ref");
812 return types.createErrorType(t);
813 }
814 } else {
815 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
816 }
817 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
818 log.error(tree.pos(), "intf.expected.here");
819 // return errType is necessary since otherwise there might
820 // be undetected cycles which cause attribution to loop
821 return types.createErrorType(t);
822 } else if (checkExtensible &&
823 classExpected &&
824 (t.tsym.flags() & INTERFACE) != 0) {
825 log.error(tree.pos(), "no.intf.expected.here");
826 return types.createErrorType(t);
827 }
828 if (checkExtensible &&
829 ((t.tsym.flags() & FINAL) != 0)) {
830 log.error(tree.pos(),
831 "cant.inherit.from.final", t.tsym);
832 }
833 chk.checkNonCyclic(tree.pos(), t);
834 return t;
835 }
836
837 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
838 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
839 id.type = env.info.scope.owner.type;
840 id.sym = env.info.scope.owner;
841 return id.type;
842 }
843
844 public void visitClassDef(JCClassDecl tree) {
845 // Local classes have not been entered yet, so we need to do it now:
846 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
847 enter.classEnter(tree, env);
848
849 ClassSymbol c = tree.sym;
850 if (c == null) {
851 // exit in case something drastic went wrong during enter.
852 result = null;
853 } else {
854 // make sure class has been completed:
855 c.complete();
856
857 // If this class appears as an anonymous class
858 // in a superclass constructor call where
859 // no explicit outer instance is given,
860 // disable implicit outer instance from being passed.
861 // (This would be an illegal access to "this before super").
862 if (env.info.isSelfCall &&
863 env.tree.hasTag(NEWCLASS) &&
864 ((JCNewClass) env.tree).encl == null)
865 {
866 c.flags_field |= NOOUTERTHIS;
867 }
868 attribClass(tree.pos(), c);
869 result = tree.type = c.type;
870 }
871 }
872
873 public void visitMethodDef(JCMethodDecl tree) {
874 MethodSymbol m = tree.sym;
875 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
876
877 Lint lint = env.info.lint.augment(m.annotations, m.flags());
878 Lint prevLint = chk.setLint(lint);
879 MethodSymbol prevMethod = chk.setMethod(m);
880 try {
881 deferredLintHandler.flush(tree.pos());
882 chk.checkDeprecatedAnnotation(tree.pos(), m);
883
884
885 // Create a new environment with local scope
886 // for attributing the method.
887 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
888 localEnv.info.lint = lint;
889
890 attribStats(tree.typarams, localEnv);
891
892 // If we override any other methods, check that we do so properly.
893 // JLS ???
894 if (m.isStatic()) {
895 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
896 } else {
897 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
898 }
899 chk.checkOverride(tree, m);
900
901 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
902 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
903 }
904
905 // Enter all type parameters into the local method scope.
906 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
907 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
908
909 ClassSymbol owner = env.enclClass.sym;
910 if ((owner.flags() & ANNOTATION) != 0 &&
911 tree.params.nonEmpty())
912 log.error(tree.params.head.pos(),
913 "intf.annotation.members.cant.have.params");
914
915 // Attribute all value parameters.
916 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
917 attribStat(l.head, localEnv);
918 }
919
920 chk.checkVarargsMethodDecl(localEnv, tree);
921
922 // Check that type parameters are well-formed.
923 chk.validate(tree.typarams, localEnv);
924
925 // Check that result type is well-formed.
926 chk.validate(tree.restype, localEnv);
927
928 // Check that receiver type is well-formed.
929 if (tree.recvparam != null) {
930 // Use a new environment to check the receiver parameter.
931 // Otherwise I get "might not have been initialized" errors.
932 // Is there a better way?
933 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
934 attribType(tree.recvparam, newEnv);
935 chk.validate(tree.recvparam, newEnv);
936 if (!(tree.recvparam.type == m.owner.type || types.isSameType(tree.recvparam.type, m.owner.type))) {
937 // The == covers the common non-generic case, but for generic classes we need isSameType;
938 // note that equals didn't work.
939 log.error(tree.recvparam.pos(), "incorrect.receiver.type");
940 }
941 }
942
943 // annotation method checks
944 if ((owner.flags() & ANNOTATION) != 0) {
945 // annotation method cannot have throws clause
946 if (tree.thrown.nonEmpty()) {
947 log.error(tree.thrown.head.pos(),
948 "throws.not.allowed.in.intf.annotation");
949 }
950 // annotation method cannot declare type-parameters
951 if (tree.typarams.nonEmpty()) {
952 log.error(tree.typarams.head.pos(),
953 "intf.annotation.members.cant.have.type.params");
954 }
955 // validate annotation method's return type (could be an annotation type)
956 chk.validateAnnotationType(tree.restype);
957 // ensure that annotation method does not clash with members of Object/Annotation
958 chk.validateAnnotationMethod(tree.pos(), m);
959
960 if (tree.defaultValue != null) {
961 // if default value is an annotation, check it is a well-formed
962 // annotation value (e.g. no duplicate values, no missing values, etc.)
963 chk.validateAnnotationTree(tree.defaultValue);
964 }
965 }
966
967 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
968 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
969
970 if (tree.body == null) {
971 // Empty bodies are only allowed for
972 // abstract, native, or interface methods, or for methods
973 // in a retrofit signature class.
974 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
975 !relax)
976 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
977 if (tree.defaultValue != null) {
978 if ((owner.flags() & ANNOTATION) == 0)
979 log.error(tree.pos(),
980 "default.allowed.in.intf.annotation.member");
981 }
982 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
983 if ((owner.flags() & INTERFACE) != 0) {
984 log.error(tree.body.pos(), "intf.meth.cant.have.body");
985 } else {
986 log.error(tree.pos(), "abstract.meth.cant.have.body");
987 }
988 } else if ((tree.mods.flags & NATIVE) != 0) {
989 log.error(tree.pos(), "native.meth.cant.have.body");
990 } else {
991 // Add an implicit super() call unless an explicit call to
992 // super(...) or this(...) is given
993 // or we are compiling class java.lang.Object.
994 if (tree.name == names.init && owner.type != syms.objectType) {
995 JCBlock body = tree.body;
996 if (body.stats.isEmpty() ||
997 !TreeInfo.isSelfCall(body.stats.head)) {
998 body.stats = body.stats.
999 prepend(memberEnter.SuperCall(make.at(body.pos),
1000 List.<Type>nil(),
1001 List.<JCVariableDecl>nil(),
1002 false));
1003 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1004 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1005 TreeInfo.isSuperCall(body.stats.head)) {
1006 // enum constructors are not allowed to call super
1007 // directly, so make sure there aren't any super calls
1008 // in enum constructors, except in the compiler
1009 // generated one.
1010 log.error(tree.body.stats.head.pos(),
1011 "call.to.super.not.allowed.in.enum.ctor",
1012 env.enclClass.sym);
1013 }
1014 }
1015
1016 // Attribute all type annotations in the body
1017 memberEnter.typeAnnotate(tree.body, localEnv, m);
1018 annotate.flush();
1019
1020 // Attribute method body.
1021 attribStat(tree.body, localEnv);
1022 }
1023
1024 localEnv.info.scope.leave();
1025 result = tree.type = m.type;
1026 chk.validateAnnotations(tree.mods.annotations, m);
1027 }
1028 finally {
1029 chk.setLint(prevLint);
1030 chk.setMethod(prevMethod);
1031 }
1032 }
1033
1034 public void visitVarDef(JCVariableDecl tree) {
1035 // Local variables have not been entered yet, so we need to do it now:
1036 if (env.info.scope.owner.kind == MTH) {
1037 if (tree.sym != null) {
1038 // parameters have already been entered
1039 env.info.scope.enter(tree.sym);
1040 } else {
1041 memberEnter.memberEnter(tree, env);
1042 annotate.flush();
1043 }
1044 } else {
1045 if (tree.init != null) {
1046 // Field initializer expression need to be entered.
1047 memberEnter.typeAnnotate(tree.init, env, tree.sym);
1048 annotate.flush();
1049 }
1050 }
1051
1052 VarSymbol v = tree.sym;
1053 Lint lint = env.info.lint.augment(v.annotations, v.flags());
1054 Lint prevLint = chk.setLint(lint);
1055
1056 // Check that the variable's declared type is well-formed.
1057 chk.validate(tree.vartype, env);
1058 deferredLintHandler.flush(tree.pos());
1059
1060 try {
1061 chk.checkDeprecatedAnnotation(tree.pos(), v);
1062
1063 if (tree.init != null) {
1064 if ((v.flags_field & FINAL) != 0 &&
1065 !tree.init.hasTag(NEWCLASS) &&
1066 !tree.init.hasTag(LAMBDA) &&
1067 !tree.init.hasTag(REFERENCE)) {
1068 // In this case, `v' is final. Ensure that it's initializer is
1069 // evaluated.
1070 v.getConstValue(); // ensure initializer is evaluated
1071 } else {
1072 // Attribute initializer in a new environment
1073 // with the declared variable as owner.
1074 // Check that initializer conforms to variable's declared type.
1075 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1076 initEnv.info.lint = lint;
1077 // In order to catch self-references, we set the variable's
1078 // declaration position to maximal possible value, effectively
1079 // marking the variable as undefined.
1080 initEnv.info.enclVar = v;
1081 attribExpr(tree.init, initEnv, v.type);
1082 }
1083 }
1084 result = tree.type = v.type;
1085 chk.validateAnnotations(tree.mods.annotations, v);
1086 }
1087 finally {
1088 chk.setLint(prevLint);
1089 }
1090 }
1091
1092 public void visitSkip(JCSkip tree) {
1093 result = null;
1094 }
1095
1096 public void visitBlock(JCBlock tree) {
1097 if (env.info.scope.owner.kind == TYP) {
1098 // Block is a static or instance initializer;
1099 // let the owner of the environment be a freshly
1100 // created BLOCK-method.
1101 Env<AttrContext> localEnv =
1102 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1103 localEnv.info.scope.owner =
1104 new MethodSymbol(tree.flags | BLOCK |
1105 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1106 env.info.scope.owner);
1107 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1108
1109 // Attribute all type annotations in the block
1110 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1111 annotate.flush();
1112
1113 attribStats(tree.stats, localEnv);
1114 } else {
1115 // Create a new local environment with a local scope.
1116 Env<AttrContext> localEnv =
1117 env.dup(tree, env.info.dup(env.info.scope.dup()));
1118 try {
1119 attribStats(tree.stats, localEnv);
1120 } finally {
1121 localEnv.info.scope.leave();
1122 }
1123 }
1124 result = null;
1125 }
1126
1127 public void visitDoLoop(JCDoWhileLoop tree) {
1128 attribStat(tree.body, env.dup(tree));
1129 attribExpr(tree.cond, env, syms.booleanType);
1130 result = null;
1131 }
1132
1133 public void visitWhileLoop(JCWhileLoop tree) {
1134 attribExpr(tree.cond, env, syms.booleanType);
1135 attribStat(tree.body, env.dup(tree));
1136 result = null;
1137 }
1138
1139 public void visitForLoop(JCForLoop tree) {
1140 Env<AttrContext> loopEnv =
1141 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1142 try {
1143 attribStats(tree.init, loopEnv);
1144 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1145 loopEnv.tree = tree; // before, we were not in loop!
1146 attribStats(tree.step, loopEnv);
1147 attribStat(tree.body, loopEnv);
1148 result = null;
1149 }
1150 finally {
1151 loopEnv.info.scope.leave();
1152 }
1153 }
1154
1155 public void visitForeachLoop(JCEnhancedForLoop tree) {
1156 Env<AttrContext> loopEnv =
1157 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1158 try {
1159 attribStat(tree.var, loopEnv);
1160 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1161 chk.checkNonVoid(tree.pos(), exprType);
1162 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1163 if (elemtype == null) {
1164 // or perhaps expr implements Iterable<T>?
1165 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1166 if (base == null) {
1167 log.error(tree.expr.pos(),
1168 "foreach.not.applicable.to.type",
1169 exprType,
1170 diags.fragment("type.req.array.or.iterable"));
1171 elemtype = types.createErrorType(exprType);
1172 } else {
1173 List<Type> iterableParams = base.allparams();
1174 elemtype = iterableParams.isEmpty()
1175 ? syms.objectType
1176 : types.upperBound(iterableParams.head);
1177 }
1178 }
1179 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1180 loopEnv.tree = tree; // before, we were not in loop!
1181 attribStat(tree.body, loopEnv);
1182 result = null;
1183 }
1184 finally {
1185 loopEnv.info.scope.leave();
1186 }
1187 }
1188
1189 public void visitLabelled(JCLabeledStatement tree) {
1190 // Check that label is not used in an enclosing statement
1191 Env<AttrContext> env1 = env;
1192 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1193 if (env1.tree.hasTag(LABELLED) &&
1194 ((JCLabeledStatement) env1.tree).label == tree.label) {
1195 log.error(tree.pos(), "label.already.in.use",
1196 tree.label);
1197 break;
1198 }
1199 env1 = env1.next;
1200 }
1201
1202 attribStat(tree.body, env.dup(tree));
1203 result = null;
1204 }
1205
1206 public void visitSwitch(JCSwitch tree) {
1207 Type seltype = attribExpr(tree.selector, env);
1208
1209 Env<AttrContext> switchEnv =
1210 env.dup(tree, env.info.dup(env.info.scope.dup()));
1211
1212 try {
1213
1214 boolean enumSwitch =
1215 allowEnums &&
1216 (seltype.tsym.flags() & Flags.ENUM) != 0;
1217 boolean stringSwitch = false;
1218 if (types.isSameType(seltype, syms.stringType)) {
1219 if (allowStringsInSwitch) {
1220 stringSwitch = true;
1221 } else {
1222 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1223 }
1224 }
1225 if (!enumSwitch && !stringSwitch)
1226 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1227
1228 // Attribute all cases and
1229 // check that there are no duplicate case labels or default clauses.
1230 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1231 boolean hasDefault = false; // Is there a default label?
1232 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1233 JCCase c = l.head;
1234 Env<AttrContext> caseEnv =
1235 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1236 try {
1237 if (c.pat != null) {
1238 if (enumSwitch) {
1239 Symbol sym = enumConstant(c.pat, seltype);
1240 if (sym == null) {
1241 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1242 } else if (!labels.add(sym)) {
1243 log.error(c.pos(), "duplicate.case.label");
1244 }
1245 } else {
1246 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1247 if (!pattype.hasTag(ERROR)) {
1248 if (pattype.constValue() == null) {
1249 log.error(c.pat.pos(),
1250 (stringSwitch ? "string.const.req" : "const.expr.req"));
1251 } else if (labels.contains(pattype.constValue())) {
1252 log.error(c.pos(), "duplicate.case.label");
1253 } else {
1254 labels.add(pattype.constValue());
1255 }
1256 }
1257 }
1258 } else if (hasDefault) {
1259 log.error(c.pos(), "duplicate.default.label");
1260 } else {
1261 hasDefault = true;
1262 }
1263 attribStats(c.stats, caseEnv);
1264 } finally {
1265 caseEnv.info.scope.leave();
1266 addVars(c.stats, switchEnv.info.scope);
1267 }
1268 }
1269
1270 result = null;
1271 }
1272 finally {
1273 switchEnv.info.scope.leave();
1274 }
1275 }
1276 // where
1277 /** Add any variables defined in stats to the switch scope. */
1278 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1279 for (;stats.nonEmpty(); stats = stats.tail) {
1280 JCTree stat = stats.head;
1281 if (stat.hasTag(VARDEF))
1282 switchScope.enter(((JCVariableDecl) stat).sym);
1283 }
1284 }
1285 // where
1286 /** Return the selected enumeration constant symbol, or null. */
1287 private Symbol enumConstant(JCTree tree, Type enumType) {
1288 if (!tree.hasTag(IDENT)) {
1289 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1290 return syms.errSymbol;
1291 }
1292 JCIdent ident = (JCIdent)tree;
1293 Name name = ident.name;
1294 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1295 e.scope != null; e = e.next()) {
1296 if (e.sym.kind == VAR) {
1297 Symbol s = ident.sym = e.sym;
1298 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1299 ident.type = s.type;
1300 return ((s.flags_field & Flags.ENUM) == 0)
1301 ? null : s;
1302 }
1303 }
1304 return null;
1305 }
1306
1307 public void visitSynchronized(JCSynchronized tree) {
1308 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1309 attribStat(tree.body, env);
1310 result = null;
1311 }
1312
1313 public void visitTry(JCTry tree) {
1314 // Create a new local environment with a local
1315 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1316 try {
1317 boolean isTryWithResource = tree.resources.nonEmpty();
1318 // Create a nested environment for attributing the try block if needed
1319 Env<AttrContext> tryEnv = isTryWithResource ?
1320 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1321 localEnv;
1322 try {
1323 // Attribute resource declarations
1324 for (JCTree resource : tree.resources) {
1325 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1326 @Override
1327 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1328 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1329 }
1330 };
1331 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1332 if (resource.hasTag(VARDEF)) {
1333 attribStat(resource, tryEnv);
1334 twrResult.check(resource, resource.type);
1335
1336 //check that resource type cannot throw InterruptedException
1337 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1338
1339 VarSymbol var = (VarSymbol)TreeInfo.symbolFor(resource);
1340 var.setData(ElementKind.RESOURCE_VARIABLE);
1341 } else {
1342 attribTree(resource, tryEnv, twrResult);
1343 }
1344 }
1345 // Attribute body
1346 attribStat(tree.body, tryEnv);
1347 } finally {
1348 if (isTryWithResource)
1349 tryEnv.info.scope.leave();
1350 }
1351
1352 // Attribute catch clauses
1353 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1354 JCCatch c = l.head;
1355 Env<AttrContext> catchEnv =
1356 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1357 try {
1358 Type ctype = attribStat(c.param, catchEnv);
1359 if (TreeInfo.isMultiCatch(c)) {
1360 //multi-catch parameter is implicitly marked as final
1361 c.param.sym.flags_field |= FINAL | UNION;
1362 }
1363 if (c.param.sym.kind == Kinds.VAR) {
1364 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1365 }
1366 chk.checkType(c.param.vartype.pos(),
1367 chk.checkClassType(c.param.vartype.pos(), ctype),
1368 syms.throwableType);
1369 attribStat(c.body, catchEnv);
1370 } finally {
1371 catchEnv.info.scope.leave();
1372 }
1373 }
1374
1375 // Attribute finalizer
1376 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1377 result = null;
1378 }
1379 finally {
1380 localEnv.info.scope.leave();
1381 }
1382 }
1383
1384 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1385 if (!resource.isErroneous() &&
1386 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1387 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1388 Symbol close = syms.noSymbol;
1389 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1390 try {
1391 close = rs.resolveQualifiedMethod(pos,
1392 env,
1393 resource,
1394 names.close,
1395 List.<Type>nil(),
1396 List.<Type>nil());
1397 }
1398 finally {
1399 log.popDiagnosticHandler(discardHandler);
1400 }
1401 if (close.kind == MTH &&
1402 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1403 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1404 env.info.lint.isEnabled(LintCategory.TRY)) {
1405 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1406 }
1407 }
1408 }
1409
1410 public void visitConditional(JCConditional tree) {
1411 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1412
1413 tree.polyKind = (!allowPoly ||
1414 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1415 isBooleanOrNumeric(env, tree)) ?
1416 PolyKind.STANDALONE : PolyKind.POLY;
1417
1418 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1419 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1420 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1421 result = tree.type = types.createErrorType(resultInfo.pt);
1422 return;
1423 }
1424
1425 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1426 unknownExprInfo :
1427 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1428 //this will use enclosing check context to check compatibility of
1429 //subexpression against target type; if we are in a method check context,
1430 //depending on whether boxing is allowed, we could have incompatibilities
1431 @Override
1432 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1433 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1434 }
1435 });
1436
1437 Type truetype = attribTree(tree.truepart, env, condInfo);
1438 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1439
1440 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1441 if (condtype.constValue() != null &&
1442 truetype.constValue() != null &&
1443 falsetype.constValue() != null &&
1444 !owntype.hasTag(NONE)) {
1445 //constant folding
1446 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1447 }
1448 result = check(tree, owntype, VAL, resultInfo);
1449 }
1450 //where
1451 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1452 switch (tree.getTag()) {
1453 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1454 ((JCLiteral)tree).typetag == BOOLEAN ||
1455 ((JCLiteral)tree).typetag == BOT;
1456 case LAMBDA: case REFERENCE: return false;
1457 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1458 case CONDEXPR:
1459 JCConditional condTree = (JCConditional)tree;
1460 return isBooleanOrNumeric(env, condTree.truepart) &&
1461 isBooleanOrNumeric(env, condTree.falsepart);
1462 case APPLY:
1463 JCMethodInvocation speculativeMethodTree =
1464 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1465 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1466 return types.unboxedTypeOrType(owntype).isPrimitive();
1467 case NEWCLASS:
1468 JCExpression className =
1469 removeClassParams.translate(((JCNewClass)tree).clazz);
1470 JCExpression speculativeNewClassTree =
1471 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1472 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1473 default:
1474 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1475 speculativeType = types.unboxedTypeOrType(speculativeType);
1476 return speculativeType.isPrimitive();
1477 }
1478 }
1479 //where
1480 TreeTranslator removeClassParams = new TreeTranslator() {
1481 @Override
1482 public void visitTypeApply(JCTypeApply tree) {
1483 result = translate(tree.clazz);
1484 }
1485 };
1486
1487 /** Compute the type of a conditional expression, after
1488 * checking that it exists. See JLS 15.25. Does not take into
1489 * account the special case where condition and both arms
1490 * are constants.
1491 *
1492 * @param pos The source position to be used for error
1493 * diagnostics.
1494 * @param thentype The type of the expression's then-part.
1495 * @param elsetype The type of the expression's else-part.
1496 */
1497 private Type condType(DiagnosticPosition pos,
1498 Type thentype, Type elsetype) {
1499 // If same type, that is the result
1500 if (types.isSameType(thentype, elsetype))
1501 return thentype.baseType();
1502
1503 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1504 ? thentype : types.unboxedType(thentype);
1505 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1506 ? elsetype : types.unboxedType(elsetype);
1507
1508 // Otherwise, if both arms can be converted to a numeric
1509 // type, return the least numeric type that fits both arms
1510 // (i.e. return larger of the two, or return int if one
1511 // arm is short, the other is char).
1512 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1513 // If one arm has an integer subrange type (i.e., byte,
1514 // short, or char), and the other is an integer constant
1515 // that fits into the subrange, return the subrange type.
1516 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && elseUnboxed.hasTag(INT) &&
1517 types.isAssignable(elseUnboxed, thenUnboxed))
1518 return thenUnboxed.baseType();
1519 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && thenUnboxed.hasTag(INT) &&
1520 types.isAssignable(thenUnboxed, elseUnboxed))
1521 return elseUnboxed.baseType();
1522
1523 for (TypeTag tag : TypeTag.values()) {
1524 if (tag.ordinal() >= TypeTag.getTypeTagCount()) break;
1525 Type candidate = syms.typeOfTag[tag.ordinal()];
1526 if (candidate != null &&
1527 candidate.isPrimitive() &&
1528 types.isSubtype(thenUnboxed, candidate) &&
1529 types.isSubtype(elseUnboxed, candidate))
1530 return candidate;
1531 }
1532 }
1533
1534 // Those were all the cases that could result in a primitive
1535 if (allowBoxing) {
1536 if (thentype.isPrimitive())
1537 thentype = types.boxedClass(thentype).type;
1538 if (elsetype.isPrimitive())
1539 elsetype = types.boxedClass(elsetype).type;
1540 }
1541
1542 if (types.isSubtype(thentype, elsetype))
1543 return elsetype.baseType();
1544 if (types.isSubtype(elsetype, thentype))
1545 return thentype.baseType();
1546
1547 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1548 log.error(pos, "neither.conditional.subtype",
1549 thentype, elsetype);
1550 return thentype.baseType();
1551 }
1552
1553 // both are known to be reference types. The result is
1554 // lub(thentype,elsetype). This cannot fail, as it will
1555 // always be possible to infer "Object" if nothing better.
1556 return types.lub(thentype.baseType(), elsetype.baseType());
1557 }
1558
1559 public void visitIf(JCIf tree) {
1560 attribExpr(tree.cond, env, syms.booleanType);
1561 attribStat(tree.thenpart, env);
1562 if (tree.elsepart != null)
1563 attribStat(tree.elsepart, env);
1564 chk.checkEmptyIf(tree);
1565 result = null;
1566 }
1567
1568 public void visitExec(JCExpressionStatement tree) {
1569 //a fresh environment is required for 292 inference to work properly ---
1570 //see Infer.instantiatePolymorphicSignatureInstance()
1571 Env<AttrContext> localEnv = env.dup(tree);
1572 attribExpr(tree.expr, localEnv);
1573 result = null;
1574 }
1575
1576 public void visitBreak(JCBreak tree) {
1577 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1578 result = null;
1579 }
1580
1581 public void visitContinue(JCContinue tree) {
1582 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1583 result = null;
1584 }
1585 //where
1586 /** Return the target of a break or continue statement, if it exists,
1587 * report an error if not.
1588 * Note: The target of a labelled break or continue is the
1589 * (non-labelled) statement tree referred to by the label,
1590 * not the tree representing the labelled statement itself.
1591 *
1592 * @param pos The position to be used for error diagnostics
1593 * @param tag The tag of the jump statement. This is either
1594 * Tree.BREAK or Tree.CONTINUE.
1595 * @param label The label of the jump statement, or null if no
1596 * label is given.
1597 * @param env The environment current at the jump statement.
1598 */
1599 private JCTree findJumpTarget(DiagnosticPosition pos,
1600 JCTree.Tag tag,
1601 Name label,
1602 Env<AttrContext> env) {
1603 // Search environments outwards from the point of jump.
1604 Env<AttrContext> env1 = env;
1605 LOOP:
1606 while (env1 != null) {
1607 switch (env1.tree.getTag()) {
1608 case LABELLED:
1609 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1610 if (label == labelled.label) {
1611 // If jump is a continue, check that target is a loop.
1612 if (tag == CONTINUE) {
1613 if (!labelled.body.hasTag(DOLOOP) &&
1614 !labelled.body.hasTag(WHILELOOP) &&
1615 !labelled.body.hasTag(FORLOOP) &&
1616 !labelled.body.hasTag(FOREACHLOOP))
1617 log.error(pos, "not.loop.label", label);
1618 // Found labelled statement target, now go inwards
1619 // to next non-labelled tree.
1620 return TreeInfo.referencedStatement(labelled);
1621 } else {
1622 return labelled;
1623 }
1624 }
1625 break;
1626 case DOLOOP:
1627 case WHILELOOP:
1628 case FORLOOP:
1629 case FOREACHLOOP:
1630 if (label == null) return env1.tree;
1631 break;
1632 case SWITCH:
1633 if (label == null && tag == BREAK) return env1.tree;
1634 break;
1635 case LAMBDA:
1636 case METHODDEF:
1637 case CLASSDEF:
1638 break LOOP;
1639 default:
1640 }
1641 env1 = env1.next;
1642 }
1643 if (label != null)
1644 log.error(pos, "undef.label", label);
1645 else if (tag == CONTINUE)
1646 log.error(pos, "cont.outside.loop");
1647 else
1648 log.error(pos, "break.outside.switch.loop");
1649 return null;
1650 }
1651
1652 public void visitReturn(JCReturn tree) {
1653 // Check that there is an enclosing method which is
1654 // nested within than the enclosing class.
1655 if (env.info.returnResult == null) {
1656 log.error(tree.pos(), "ret.outside.meth");
1657 } else {
1658 // Attribute return expression, if it exists, and check that
1659 // it conforms to result type of enclosing method.
1660 if (tree.expr != null) {
1661 if (env.info.returnResult.pt.hasTag(VOID)) {
1662 env.info.returnResult.checkContext.report(tree.expr.pos(),
1663 diags.fragment("unexpected.ret.val"));
1664 }
1665 attribTree(tree.expr, env, env.info.returnResult);
1666 } else if (!env.info.returnResult.pt.hasTag(VOID)) {
1667 env.info.returnResult.checkContext.report(tree.pos(),
1668 diags.fragment("missing.ret.val"));
1669 }
1670 }
1671 result = null;
1672 }
1673
1674 public void visitThrow(JCThrow tree) {
1675 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1676 if (allowPoly) {
1677 chk.checkType(tree, owntype, syms.throwableType);
1678 }
1679 result = null;
1680 }
1681
1682 public void visitAssert(JCAssert tree) {
1683 attribExpr(tree.cond, env, syms.booleanType);
1684 if (tree.detail != null) {
1685 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1686 }
1687 result = null;
1688 }
1689
1690 /** Visitor method for method invocations.
1691 * NOTE: The method part of an application will have in its type field
1692 * the return type of the method, not the method's type itself!
1693 */
1694 public void visitApply(JCMethodInvocation tree) {
1695 // The local environment of a method application is
1696 // a new environment nested in the current one.
1697 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1698
1699 // The types of the actual method arguments.
1700 List<Type> argtypes;
1701
1702 // The types of the actual method type arguments.
1703 List<Type> typeargtypes = null;
1704
1705 Name methName = TreeInfo.name(tree.meth);
1706
1707 boolean isConstructorCall =
1708 methName == names._this || methName == names._super;
1709
1710 if (isConstructorCall) {
1711 // We are seeing a ...this(...) or ...super(...) call.
1712 // Check that this is the first statement in a constructor.
1713 if (checkFirstConstructorStat(tree, env)) {
1714
1715 // Record the fact
1716 // that this is a constructor call (using isSelfCall).
1717 localEnv.info.isSelfCall = true;
1718
1719 // Attribute arguments, yielding list of argument types.
1720 argtypes = attribArgs(tree.args, localEnv);
1721 typeargtypes = attribTypes(tree.typeargs, localEnv);
1722
1723 // Variable `site' points to the class in which the called
1724 // constructor is defined.
1725 Type site = env.enclClass.sym.type;
1726 if (methName == names._super) {
1727 if (site == syms.objectType) {
1728 log.error(tree.meth.pos(), "no.superclass", site);
1729 site = types.createErrorType(syms.objectType);
1730 } else {
1731 site = types.supertype(site);
1732 }
1733 }
1734
1735 if (site.hasTag(CLASS)) {
1736 Type encl = site.getEnclosingType();
1737 while (encl != null && encl.hasTag(TYPEVAR))
1738 encl = encl.getUpperBound();
1739 if (encl.hasTag(CLASS)) {
1740 // we are calling a nested class
1741
1742 if (tree.meth.hasTag(SELECT)) {
1743 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1744
1745 // We are seeing a prefixed call, of the form
1746 // <expr>.super(...).
1747 // Check that the prefix expression conforms
1748 // to the outer instance type of the class.
1749 chk.checkRefType(qualifier.pos(),
1750 attribExpr(qualifier, localEnv,
1751 encl));
1752 } else if (methName == names._super) {
1753 // qualifier omitted; check for existence
1754 // of an appropriate implicit qualifier.
1755 rs.resolveImplicitThis(tree.meth.pos(),
1756 localEnv, site, true);
1757 }
1758 } else if (tree.meth.hasTag(SELECT)) {
1759 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1760 site.tsym);
1761 }
1762
1763 // if we're calling a java.lang.Enum constructor,
1764 // prefix the implicit String and int parameters
1765 if (site.tsym == syms.enumSym && allowEnums)
1766 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1767
1768 // Resolve the called constructor under the assumption
1769 // that we are referring to a superclass instance of the
1770 // current instance (JLS ???).
1771 boolean selectSuperPrev = localEnv.info.selectSuper;
1772 localEnv.info.selectSuper = true;
1773 localEnv.info.pendingResolutionPhase = null;
1774 Symbol sym = rs.resolveConstructor(
1775 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1776 localEnv.info.selectSuper = selectSuperPrev;
1777
1778 // Set method symbol to resolved constructor...
1779 TreeInfo.setSymbol(tree.meth, sym);
1780
1781 // ...and check that it is legal in the current context.
1782 // (this will also set the tree's type)
1783 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1784 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1785 }
1786 // Otherwise, `site' is an error type and we do nothing
1787 }
1788 result = tree.type = syms.voidType;
1789 } else {
1790 // Otherwise, we are seeing a regular method call.
1791 // Attribute the arguments, yielding list of argument types, ...
1792 argtypes = attribArgs(tree.args, localEnv);
1793 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1794
1795 // ... and attribute the method using as a prototype a methodtype
1796 // whose formal argument types is exactly the list of actual
1797 // arguments (this will also set the method symbol).
1798 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1799 localEnv.info.pendingResolutionPhase = null;
1800 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(VAL, mpt, resultInfo.checkContext));
1801
1802 // Compute the result type.
1803 Type restype = mtype.getReturnType();
1804 if (restype.hasTag(WILDCARD))
1805 throw new AssertionError(mtype);
1806
1807 Type qualifier = (tree.meth.hasTag(SELECT))
1808 ? ((JCFieldAccess) tree.meth).selected.type
1809 : env.enclClass.sym.type;
1810 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1811
1812 chk.checkRefTypes(tree.typeargs, typeargtypes);
1813
1814 // Check that value of resulting type is admissible in the
1815 // current context. Also, capture the return type
1816 result = check(tree, capture(restype), VAL, resultInfo);
1817
1818 if (localEnv.info.lastResolveVarargs())
1819 Assert.check(result.isErroneous() || tree.varargsElement != null);
1820 }
1821 chk.validate(tree.typeargs, localEnv);
1822 }
1823 //where
1824 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1825 if (allowCovariantReturns &&
1826 methodName == names.clone &&
1827 types.isArray(qualifierType)) {
1828 // as a special case, array.clone() has a result that is
1829 // the same as static type of the array being cloned
1830 return qualifierType;
1831 } else if (allowGenerics &&
1832 methodName == names.getClass &&
1833 argtypes.isEmpty()) {
1834 // as a special case, x.getClass() has type Class<? extends |X|>
1835 return new ClassType(restype.getEnclosingType(),
1836 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1837 BoundKind.EXTENDS,
1838 syms.boundClass)),
1839 restype.tsym);
1840 } else {
1841 return restype;
1842 }
1843 }
1844
1845 /** Check that given application node appears as first statement
1846 * in a constructor call.
1847 * @param tree The application node
1848 * @param env The environment current at the application.
1849 */
1850 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1851 JCMethodDecl enclMethod = env.enclMethod;
1852 if (enclMethod != null && enclMethod.name == names.init) {
1853 JCBlock body = enclMethod.body;
1854 if (body.stats.head.hasTag(EXEC) &&
1855 ((JCExpressionStatement) body.stats.head).expr == tree)
1856 return true;
1857 }
1858 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1859 TreeInfo.name(tree.meth));
1860 return false;
1861 }
1862
1863 /** Obtain a method type with given argument types.
1864 */
1865 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1866 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1867 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1868 }
1869
1870 public void visitNewClass(final JCNewClass tree) {
1871 Type owntype = types.createErrorType(tree.type);
1872
1873 // The local environment of a class creation is
1874 // a new environment nested in the current one.
1875 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1876
1877 // The anonymous inner class definition of the new expression,
1878 // if one is defined by it.
1879 JCClassDecl cdef = tree.def;
1880
1881 // If enclosing class is given, attribute it, and
1882 // complete class name to be fully qualified
1883 JCExpression clazz = tree.clazz; // Class field following new
1884 JCExpression clazzid; // Identifier in class field
1885 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1886 annoclazzid = null;
1887
1888 if (clazz.hasTag(TYPEAPPLY)) {
1889 clazzid = ((JCTypeApply) clazz).clazz;
1890 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1891 annoclazzid = (JCAnnotatedType) clazzid;
1892 clazzid = annoclazzid.underlyingType;
1893 }
1894 } else {
1895 if (clazz.hasTag(ANNOTATED_TYPE)) {
1896 annoclazzid = (JCAnnotatedType) clazz;
1897 clazzid = annoclazzid.underlyingType;
1898 } else {
1899 clazzid = clazz;
1900 }
1901 }
1902
1903 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1904
1905 if (tree.encl != null) {
1906 // We are seeing a qualified new, of the form
1907 // <expr>.new C <...> (...) ...
1908 // In this case, we let clazz stand for the name of the
1909 // allocated class C prefixed with the type of the qualifier
1910 // expression, so that we can
1911 // resolve it with standard techniques later. I.e., if
1912 // <expr> has type T, then <expr>.new C <...> (...)
1913 // yields a clazz T.C.
1914 Type encltype = chk.checkRefType(tree.encl.pos(),
1915 attribExpr(tree.encl, env));
1916 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1917 // from expr to the combined type, or not? Yes, do this.
1918 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1919 ((JCIdent) clazzid).name);
1920
1921 if (clazz.hasTag(ANNOTATED_TYPE)) {
1922 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1923 List<JCAnnotation> annos = annoType.annotations;
1924
1925 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1926 clazzid1 = make.at(tree.pos).
1927 TypeApply(clazzid1,
1928 ((JCTypeApply) clazz).arguments);
1929 }
1930
1931 clazzid1 = make.at(tree.pos).
1932 AnnotatedType(annos, clazzid1);
1933 } else if (clazz.hasTag(TYPEAPPLY)) {
1934 clazzid1 = make.at(tree.pos).
1935 TypeApply(clazzid1,
1936 ((JCTypeApply) clazz).arguments);
1937 }
1938
1939 clazz = clazzid1;
1940 }
1941
1942 // Attribute clazz expression and store
1943 // symbol + type back into the attributed tree.
1944 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1945 attribIdentAsEnumType(env, (JCIdent)clazz) :
1946 attribType(clazz, env);
1947
1948 clazztype = chk.checkDiamond(tree, clazztype);
1949 chk.validate(clazz, localEnv);
1950 if (tree.encl != null) {
1951 // We have to work in this case to store
1952 // symbol + type back into the attributed tree.
1953 tree.clazz.type = clazztype;
1954 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1955 clazzid.type = ((JCIdent) clazzid).sym.type;
1956 if (annoclazzid != null) {
1957 annoclazzid.type = clazzid.type;
1958 }
1959 if (!clazztype.isErroneous()) {
1960 if (cdef != null && clazztype.tsym.isInterface()) {
1961 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1962 } else if (clazztype.tsym.isStatic()) {
1963 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1964 }
1965 }
1966 } else if (!clazztype.tsym.isInterface() &&
1967 clazztype.getEnclosingType().hasTag(CLASS)) {
1968 // Check for the existence of an apropos outer instance
1969 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1970 }
1971
1972 // Attribute constructor arguments.
1973 List<Type> argtypes = attribArgs(tree.args, localEnv);
1974 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1975
1976 // If we have made no mistakes in the class type...
1977 if (clazztype.hasTag(CLASS)) {
1978 // Enums may not be instantiated except implicitly
1979 if (allowEnums &&
1980 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1981 (!env.tree.hasTag(VARDEF) ||
1982 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1983 ((JCVariableDecl) env.tree).init != tree))
1984 log.error(tree.pos(), "enum.cant.be.instantiated");
1985 // Check that class is not abstract
1986 if (cdef == null &&
1987 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
1988 log.error(tree.pos(), "abstract.cant.be.instantiated",
1989 clazztype.tsym);
1990 } else if (cdef != null && clazztype.tsym.isInterface()) {
1991 // Check that no constructor arguments are given to
1992 // anonymous classes implementing an interface
1993 if (!argtypes.isEmpty())
1994 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
1995
1996 if (!typeargtypes.isEmpty())
1997 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
1998
1999 // Error recovery: pretend no arguments were supplied.
2000 argtypes = List.nil();
2001 typeargtypes = List.nil();
2002 } else if (TreeInfo.isDiamond(tree)) {
2003 ClassType site = new ClassType(clazztype.getEnclosingType(),
2004 clazztype.tsym.type.getTypeArguments(),
2005 clazztype.tsym);
2006
2007 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2008 diamondEnv.info.selectSuper = cdef != null;
2009 diamondEnv.info.pendingResolutionPhase = null;
2010
2011 //if the type of the instance creation expression is a class type
2012 //apply method resolution inference (JLS 15.12.2.7). The return type
2013 //of the resolved constructor will be a partially instantiated type
2014 Symbol constructor = rs.resolveDiamond(tree.pos(),
2015 diamondEnv,
2016 site,
2017 argtypes,
2018 typeargtypes);
2019 tree.constructor = constructor.baseSymbol();
2020
2021 final TypeSymbol csym = clazztype.tsym;
2022 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2023 @Override
2024 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2025 enclosingContext.report(tree.clazz,
2026 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2027 }
2028 });
2029 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2030 constructorType = checkId(tree, site,
2031 constructor,
2032 diamondEnv,
2033 diamondResult);
2034
2035 tree.clazz.type = types.createErrorType(clazztype);
2036 if (!constructorType.isErroneous()) {
2037 tree.clazz.type = clazztype = constructorType.getReturnType();
2038 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2039 }
2040 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2041 }
2042
2043 // Resolve the called constructor under the assumption
2044 // that we are referring to a superclass instance of the
2045 // current instance (JLS ???).
2046 else {
2047 //the following code alters some of the fields in the current
2048 //AttrContext - hence, the current context must be dup'ed in
2049 //order to avoid downstream failures
2050 Env<AttrContext> rsEnv = localEnv.dup(tree);
2051 rsEnv.info.selectSuper = cdef != null;
2052 rsEnv.info.pendingResolutionPhase = null;
2053 tree.constructor = rs.resolveConstructor(
2054 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2055 if (cdef == null) { //do not check twice!
2056 tree.constructorType = checkId(tree,
2057 clazztype,
2058 tree.constructor,
2059 rsEnv,
2060 new ResultInfo(MTH, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2061 if (rsEnv.info.lastResolveVarargs())
2062 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2063 }
2064 findDiamondIfNeeded(localEnv, tree, clazztype);
2065 }
2066
2067 if (cdef != null) {
2068 // We are seeing an anonymous class instance creation.
2069 // In this case, the class instance creation
2070 // expression
2071 //
2072 // E.new <typeargs1>C<typargs2>(args) { ... }
2073 //
2074 // is represented internally as
2075 //
2076 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2077 //
2078 // This expression is then *transformed* as follows:
2079 //
2080 // (1) add a STATIC flag to the class definition
2081 // if the current environment is static
2082 // (2) add an extends or implements clause
2083 // (3) add a constructor.
2084 //
2085 // For instance, if C is a class, and ET is the type of E,
2086 // the expression
2087 //
2088 // E.new <typeargs1>C<typargs2>(args) { ... }
2089 //
2090 // is translated to (where X is a fresh name and typarams is the
2091 // parameter list of the super constructor):
2092 //
2093 // new <typeargs1>X(<*nullchk*>E, args) where
2094 // X extends C<typargs2> {
2095 // <typarams> X(ET e, args) {
2096 // e.<typeargs1>super(args)
2097 // }
2098 // ...
2099 // }
2100 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2101
2102 if (clazztype.tsym.isInterface()) {
2103 cdef.implementing = List.of(clazz);
2104 } else {
2105 cdef.extending = clazz;
2106 }
2107
2108 attribStat(cdef, localEnv);
2109
2110 checkLambdaCandidate(tree, cdef.sym, clazztype);
2111
2112 // If an outer instance is given,
2113 // prefix it to the constructor arguments
2114 // and delete it from the new expression
2115 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2116 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2117 argtypes = argtypes.prepend(tree.encl.type);
2118 tree.encl = null;
2119 }
2120
2121 // Reassign clazztype and recompute constructor.
2122 clazztype = cdef.sym.type;
2123 Symbol sym = tree.constructor = rs.resolveConstructor(
2124 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2125 Assert.check(sym.kind < AMBIGUOUS);
2126 tree.constructor = sym;
2127 tree.constructorType = checkId(tree,
2128 clazztype,
2129 tree.constructor,
2130 localEnv,
2131 new ResultInfo(VAL, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2132 }
2133
2134 if (tree.constructor != null && tree.constructor.kind == MTH)
2135 owntype = clazztype;
2136 }
2137 result = check(tree, owntype, VAL, resultInfo);
2138 chk.validate(tree.typeargs, localEnv);
2139 }
2140 //where
2141 void findDiamondIfNeeded(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2142 if (tree.def == null &&
2143 !clazztype.isErroneous() &&
2144 clazztype.getTypeArguments().nonEmpty() &&
2145 findDiamonds) {
2146 JCTypeApply ta = (JCTypeApply)tree.clazz;
2147 List<JCExpression> prevTypeargs = ta.arguments;
2148 try {
2149 //create a 'fake' diamond AST node by removing type-argument trees
2150 ta.arguments = List.nil();
2151 ResultInfo findDiamondResult = new ResultInfo(VAL,
2152 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2153 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2154 if (!inferred.isErroneous() &&
2155 types.isAssignable(inferred, pt().hasTag(NONE) ? syms.objectType : pt(), types.noWarnings)) {
2156 String key = types.isSameType(clazztype, inferred) ?
2157 "diamond.redundant.args" :
2158 "diamond.redundant.args.1";
2159 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2160 }
2161 } finally {
2162 ta.arguments = prevTypeargs;
2163 }
2164 }
2165 }
2166
2167 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2168 if (allowLambda &&
2169 identifyLambdaCandidate &&
2170 clazztype.hasTag(CLASS) &&
2171 !pt().hasTag(NONE) &&
2172 types.isFunctionalInterface(clazztype.tsym)) {
2173 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2174 int count = 0;
2175 boolean found = false;
2176 for (Symbol sym : csym.members().getElements()) {
2177 if ((sym.flags() & SYNTHETIC) != 0 ||
2178 sym.isConstructor()) continue;
2179 count++;
2180 if (sym.kind != MTH ||
2181 !sym.name.equals(descriptor.name)) continue;
2182 Type mtype = types.memberType(clazztype, sym);
2183 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2184 found = true;
2185 }
2186 }
2187 if (found && count == 1) {
2188 log.note(tree.def, "potential.lambda.found");
2189 }
2190 }
2191 }
2192
2193 /** Make an attributed null check tree.
2194 */
2195 public JCExpression makeNullCheck(JCExpression arg) {
2196 // optimization: X.this is never null; skip null check
2197 Name name = TreeInfo.name(arg);
2198 if (name == names._this || name == names._super) return arg;
2199
2200 JCTree.Tag optag = NULLCHK;
2201 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2202 tree.operator = syms.nullcheck;
2203 tree.type = arg.type;
2204 return tree;
2205 }
2206
2207 public void visitNewArray(JCNewArray tree) {
2208 Type owntype = types.createErrorType(tree.type);
2209 Env<AttrContext> localEnv = env.dup(tree);
2210 Type elemtype;
2211 if (tree.elemtype != null) {
2212 elemtype = attribType(tree.elemtype, localEnv);
2213 chk.validate(tree.elemtype, localEnv);
2214 owntype = elemtype;
2215 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2216 attribExpr(l.head, localEnv, syms.intType);
2217 owntype = new ArrayType(owntype, syms.arrayClass);
2218 }
2219 } else {
2220 // we are seeing an untyped aggregate { ... }
2221 // this is allowed only if the prototype is an array
2222 if (pt().hasTag(ARRAY)) {
2223 elemtype = types.elemtype(pt());
2224 } else {
2225 if (!pt().hasTag(ERROR)) {
2226 log.error(tree.pos(), "illegal.initializer.for.type",
2227 pt());
2228 }
2229 elemtype = types.createErrorType(pt());
2230 }
2231 }
2232 if (tree.elems != null) {
2233 attribExprs(tree.elems, localEnv, elemtype);
2234 owntype = new ArrayType(elemtype, syms.arrayClass);
2235 }
2236 if (!types.isReifiable(elemtype))
2237 log.error(tree.pos(), "generic.array.creation");
2238 result = check(tree, owntype, VAL, resultInfo);
2239 }
2240
2241 /*
2242 * A lambda expression can only be attributed when a target-type is available.
2243 * In addition, if the target-type is that of a functional interface whose
2244 * descriptor contains inference variables in argument position the lambda expression
2245 * is 'stuck' (see DeferredAttr).
2246 */
2247 @Override
2248 public void visitLambda(final JCLambda that) {
2249 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2250 if (pt().hasTag(NONE)) {
2251 //lambda only allowed in assignment or method invocation/cast context
2252 log.error(that.pos(), "unexpected.lambda");
2253 }
2254 result = that.type = types.createErrorType(pt());
2255 return;
2256 }
2257 //create an environment for attribution of the lambda expression
2258 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2259 boolean needsRecovery =
2260 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2261 try {
2262 Type target = pt();
2263 List<Type> explicitParamTypes = null;
2264 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2265 //attribute lambda parameters
2266 attribStats(that.params, localEnv);
2267 explicitParamTypes = TreeInfo.types(that.params);
2268 target = infer.instantiateFunctionalInterface(that, target, explicitParamTypes, resultInfo.checkContext);
2269 }
2270
2271 Type lambdaType;
2272 if (pt() != Type.recoveryType) {
2273 target = checkIntersectionTarget(that, target, resultInfo.checkContext);
2274 lambdaType = types.findDescriptorType(target);
2275 chk.checkFunctionalInterface(that, target);
2276 } else {
2277 target = Type.recoveryType;
2278 lambdaType = fallbackDescriptorType(that);
2279 }
2280
2281 setFunctionalInfo(that, pt(), lambdaType, resultInfo.checkContext.inferenceContext());
2282
2283 if (lambdaType.hasTag(FORALL)) {
2284 //lambda expression target desc cannot be a generic method
2285 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2286 lambdaType, kindName(target.tsym), target.tsym));
2287 result = that.type = types.createErrorType(pt());
2288 return;
2289 }
2290
2291 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2292 //add param type info in the AST
2293 List<Type> actuals = lambdaType.getParameterTypes();
2294 List<JCVariableDecl> params = that.params;
2295
2296 boolean arityMismatch = false;
2297
2298 while (params.nonEmpty()) {
2299 if (actuals.isEmpty()) {
2300 //not enough actuals to perform lambda parameter inference
2301 arityMismatch = true;
2302 }
2303 //reset previously set info
2304 Type argType = arityMismatch ?
2305 syms.errType :
2306 actuals.head;
2307 params.head.vartype = make.Type(argType);
2308 params.head.sym = null;
2309 actuals = actuals.isEmpty() ?
2310 actuals :
2311 actuals.tail;
2312 params = params.tail;
2313 }
2314
2315 //attribute lambda parameters
2316 attribStats(that.params, localEnv);
2317
2318 if (arityMismatch) {
2319 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2320 result = that.type = types.createErrorType(target);
2321 return;
2322 }
2323 }
2324
2325 //from this point on, no recovery is needed; if we are in assignment context
2326 //we will be able to attribute the whole lambda body, regardless of errors;
2327 //if we are in a 'check' method context, and the lambda is not compatible
2328 //with the target-type, it will be recovered anyway in Attr.checkId
2329 needsRecovery = false;
2330
2331 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2332 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2333 new FunctionalReturnContext(resultInfo.checkContext);
2334
2335 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2336 recoveryInfo :
2337 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2338 localEnv.info.returnResult = bodyResultInfo;
2339
2340 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2341 attribTree(that.getBody(), localEnv, bodyResultInfo);
2342 } else {
2343 JCBlock body = (JCBlock)that.body;
2344 attribStats(body.stats, localEnv);
2345 }
2346
2347 result = check(that, target, VAL, resultInfo);
2348
2349 boolean isSpeculativeRound =
2350 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2351
2352 postAttr(that);
2353 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2354
2355 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2356
2357 if (!isSpeculativeRound) {
2358 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, target);
2359 }
2360 result = check(that, target, VAL, resultInfo);
2361 } catch (Types.FunctionDescriptorLookupError ex) {
2362 JCDiagnostic cause = ex.getDiagnostic();
2363 resultInfo.checkContext.report(that, cause);
2364 result = that.type = types.createErrorType(pt());
2365 return;
2366 } finally {
2367 localEnv.info.scope.leave();
2368 if (needsRecovery) {
2369 attribTree(that, env, recoveryInfo);
2370 }
2371 }
2372 }
2373
2374 private Type checkIntersectionTarget(DiagnosticPosition pos, Type pt, CheckContext checkContext) {
2375 if (pt != Type.recoveryType && pt.isCompound()) {
2376 IntersectionClassType ict = (IntersectionClassType)pt;
2377 List<Type> bounds = ict.allInterfaces ?
2378 ict.getComponents().tail :
2379 ict.getComponents();
2380 types.findDescriptorType(bounds.head); //propagate exception outwards!
2381 for (Type bound : bounds.tail) {
2382 if (!types.isMarkerInterface(bound)) {
2383 checkContext.report(pos, diags.fragment("secondary.bound.must.be.marker.intf", bound));
2384 }
2385 }
2386 //for now (translation doesn't support intersection types)
2387 return bounds.head;
2388 } else {
2389 return pt;
2390 }
2391 }
2392 //where
2393 private Type fallbackDescriptorType(JCExpression tree) {
2394 switch (tree.getTag()) {
2395 case LAMBDA:
2396 JCLambda lambda = (JCLambda)tree;
2397 List<Type> argtypes = List.nil();
2398 for (JCVariableDecl param : lambda.params) {
2399 argtypes = param.vartype != null ?
2400 argtypes.append(param.vartype.type) :
2401 argtypes.append(syms.errType);
2402 }
2403 return new MethodType(argtypes, Type.recoveryType, List.<Type>nil(), syms.methodClass);
2404 case REFERENCE:
2405 return new MethodType(List.<Type>nil(), Type.recoveryType, List.<Type>nil(), syms.methodClass);
2406 default:
2407 Assert.error("Cannot get here!");
2408 }
2409 return null;
2410 }
2411
2412 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, final InferenceContext inferenceContext, final Type... ts) {
2413 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2414 }
2415
2416 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, final InferenceContext inferenceContext, final List<Type> ts) {
2417 if (inferenceContext.free(ts)) {
2418 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2419 @Override
2420 public void typesInferred(InferenceContext inferenceContext) {
2421 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2422 }
2423 });
2424 } else {
2425 for (Type t : ts) {
2426 rs.checkAccessibleType(env, t);
2427 }
2428 }
2429 }
2430
2431 /**
2432 * Lambda/method reference have a special check context that ensures
2433 * that i.e. a lambda return type is compatible with the expected
2434 * type according to both the inherited context and the assignment
2435 * context.
2436 */
2437 class FunctionalReturnContext extends Check.NestedCheckContext {
2438
2439 FunctionalReturnContext(CheckContext enclosingContext) {
2440 super(enclosingContext);
2441 }
2442
2443 @Override
2444 public boolean compatible(Type found, Type req, Warner warn) {
2445 //return type must be compatible in both current context and assignment context
2446 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2447 }
2448
2449 @Override
2450 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2451 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2452 }
2453 }
2454
2455 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2456
2457 JCExpression expr;
2458
2459 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2460 super(enclosingContext);
2461 this.expr = expr;
2462 }
2463
2464 @Override
2465 public boolean compatible(Type found, Type req, Warner warn) {
2466 //a void return is compatible with an expression statement lambda
2467 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2468 super.compatible(found, req, warn);
2469 }
2470 }
2471
2472 /**
2473 * Lambda compatibility. Check that given return types, thrown types, parameter types
2474 * are compatible with the expected functional interface descriptor. This means that:
2475 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2476 * types must be compatible with the return type of the expected descriptor;
2477 * (iii) thrown types must be 'included' in the thrown types list of the expected
2478 * descriptor.
2479 */
2480 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2481 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2482
2483 //return values have already been checked - but if lambda has no return
2484 //values, we must ensure that void/value compatibility is correct;
2485 //this amounts at checking that, if a lambda body can complete normally,
2486 //the descriptor's return type must be void
2487 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2488 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2489 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2490 diags.fragment("missing.ret.val", returnType)));
2491 }
2492
2493 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2494 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2495 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2496 }
2497
2498 if (!speculativeAttr) {
2499 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2500 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2501 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2502 }
2503 }
2504 }
2505
2506 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2507 Env<AttrContext> lambdaEnv;
2508 Symbol owner = env.info.scope.owner;
2509 if (owner.kind == VAR && owner.owner.kind == TYP) {
2510 //field initializer
2511 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2512 lambdaEnv.info.scope.owner =
2513 new MethodSymbol(0, names.empty, null,
2514 env.info.scope.owner);
2515 } else {
2516 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2517 }
2518 return lambdaEnv;
2519 }
2520
2521 @Override
2522 public void visitReference(final JCMemberReference that) {
2523 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2524 if (pt().hasTag(NONE)) {
2525 //method reference only allowed in assignment or method invocation/cast context
2526 log.error(that.pos(), "unexpected.mref");
2527 }
2528 result = that.type = types.createErrorType(pt());
2529 return;
2530 }
2531 final Env<AttrContext> localEnv = env.dup(that);
2532 try {
2533 //attribute member reference qualifier - if this is a constructor
2534 //reference, the expected kind must be a type
2535 Type exprType = attribTree(that.expr,
2536 env, new ResultInfo(that.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType));
2537
2538 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2539 exprType = chk.checkConstructorRefType(that.expr, exprType);
2540 }
2541
2542 if (exprType.isErroneous()) {
2543 //if the qualifier expression contains problems,
2544 //give up attribution of method reference
2545 result = that.type = exprType;
2546 return;
2547 }
2548
2549 if (TreeInfo.isStaticSelector(that.expr, names) &&
2550 (that.getMode() != ReferenceMode.NEW || !that.expr.type.isRaw())) {
2551 //if the qualifier is a type, validate it
2552 chk.validate(that.expr, env);
2553 }
2554
2555 //attrib type-arguments
2556 List<Type> typeargtypes = List.nil();
2557 if (that.typeargs != null) {
2558 typeargtypes = attribTypes(that.typeargs, localEnv);
2559 }
2560
2561 Type target;
2562 Type desc;
2563 if (pt() != Type.recoveryType) {
2564 target = checkIntersectionTarget(that, pt(), resultInfo.checkContext);
2565 desc = types.findDescriptorType(target);
2566 chk.checkFunctionalInterface(that, target);
2567 } else {
2568 target = Type.recoveryType;
2569 desc = fallbackDescriptorType(that);
2570 }
2571
2572 setFunctionalInfo(that, pt(), desc, resultInfo.checkContext.inferenceContext());
2573 List<Type> argtypes = desc.getParameterTypes();
2574
2575 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = rs.resolveMemberReference(that.pos(), localEnv, that,
2576 that.expr.type, that.name, argtypes, typeargtypes, true);
2577
2578 Symbol refSym = refResult.fst;
2579 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2580
2581 if (refSym.kind != MTH) {
2582 boolean targetError;
2583 switch (refSym.kind) {
2584 case ABSENT_MTH:
2585 targetError = false;
2586 break;
2587 case WRONG_MTH:
2588 case WRONG_MTHS:
2589 case AMBIGUOUS:
2590 case HIDDEN:
2591 case STATICERR:
2592 case MISSING_ENCL:
2593 targetError = true;
2594 break;
2595 default:
2596 Assert.error("unexpected result kind " + refSym.kind);
2597 targetError = false;
2598 }
2599
2600 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2601 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2602
2603 JCDiagnostic.DiagnosticType diagKind = targetError ?
2604 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2605
2606 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2607 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2608
2609 if (targetError && target == Type.recoveryType) {
2610 //a target error doesn't make sense during recovery stage
2611 //as we don't know what actual parameter types are
2612 result = that.type = target;
2613 return;
2614 } else {
2615 if (targetError) {
2616 resultInfo.checkContext.report(that, diag);
2617 } else {
2618 log.report(diag);
2619 }
2620 result = that.type = types.createErrorType(target);
2621 return;
2622 }
2623 }
2624
2625 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2626 if (refSym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2627 exprType.getTypeArguments().nonEmpty()) {
2628 //static ref with class type-args
2629 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2630 diags.fragment("static.mref.with.targs"));
2631 result = that.type = types.createErrorType(target);
2632 return;
2633 }
2634
2635 if (refSym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2636 !lookupHelper.referenceKind(refSym).isUnbound()) {
2637 //no static bound mrefs
2638 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2639 diags.fragment("static.bound.mref"));
2640 result = that.type = types.createErrorType(target);
2641 return;
2642 }
2643 }
2644
2645 if (desc.getReturnType() == Type.recoveryType) {
2646 // stop here
2647 result = that.type = target;
2648 return;
2649 }
2650
2651 that.sym = refSym.baseSymbol();
2652 that.kind = lookupHelper.referenceKind(that.sym);
2653
2654 ResultInfo checkInfo =
2655 resultInfo.dup(newMethodTemplate(
2656 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2657 lookupHelper.argtypes,
2658 typeargtypes));
2659
2660 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2661
2662 if (!refType.isErroneous()) {
2663 refType = types.createMethodTypeWithReturn(refType,
2664 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2665 }
2666
2667 //go ahead with standard method reference compatibility check - note that param check
2668 //is a no-op (as this has been taken care during method applicability)
2669 boolean isSpeculativeRound =
2670 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2671 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2672 if (!isSpeculativeRound) {
2673 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2674 }
2675 result = check(that, target, VAL, resultInfo);
2676 } catch (Types.FunctionDescriptorLookupError ex) {
2677 JCDiagnostic cause = ex.getDiagnostic();
2678 resultInfo.checkContext.report(that, cause);
2679 result = that.type = types.createErrorType(pt());
2680 return;
2681 }
2682 }
2683
2684 @SuppressWarnings("fallthrough")
2685 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2686 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2687
2688 Type resType;
2689 switch (tree.getMode()) {
2690 case NEW:
2691 if (!tree.expr.type.isRaw()) {
2692 resType = tree.expr.type;
2693 break;
2694 }
2695 default:
2696 resType = refType.getReturnType();
2697 }
2698
2699 Type incompatibleReturnType = resType;
2700
2701 if (returnType.hasTag(VOID)) {
2702 incompatibleReturnType = null;
2703 }
2704
2705 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2706 if (resType.isErroneous() ||
2707 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2708 incompatibleReturnType = null;
2709 }
2710 }
2711
2712 if (incompatibleReturnType != null) {
2713 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2714 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2715 }
2716
2717 if (!speculativeAttr) {
2718 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2719 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2720 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2721 }
2722 }
2723 }
2724
2725 /**
2726 * Set functional type info on the underlying AST. Note: as the target descriptor
2727 * might contain inference variables, we might need to register an hook in the
2728 * current inference context.
2729 */
2730 private void setFunctionalInfo(final JCFunctionalExpression fExpr, final Type pt, final Type descriptorType, InferenceContext inferenceContext) {
2731 if (inferenceContext.free(descriptorType)) {
2732 inferenceContext.addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2733 public void typesInferred(InferenceContext inferenceContext) {
2734 setFunctionalInfo(fExpr, pt, inferenceContext.asInstType(descriptorType), inferenceContext);
2735 }
2736 });
2737 } else {
2738 ListBuffer<TypeSymbol> targets = ListBuffer.lb();
2739 if (pt.hasTag(CLASS)) {
2740 if (pt.isCompound()) {
2741 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2742 targets.append(t.tsym);
2743 }
2744 } else {
2745 targets.append(pt.tsym);
2746 }
2747 }
2748 fExpr.targets = targets.toList();
2749 fExpr.descriptorType = descriptorType;
2750 }
2751 }
2752
2753 public void visitParens(JCParens tree) {
2754 Type owntype = attribTree(tree.expr, env, resultInfo);
2755 result = check(tree, owntype, pkind(), resultInfo);
2756 Symbol sym = TreeInfo.symbol(tree);
2757 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2758 log.error(tree.pos(), "illegal.start.of.type");
2759 }
2760
2761 public void visitAssign(JCAssign tree) {
2762 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2763 Type capturedType = capture(owntype);
2764 attribExpr(tree.rhs, env, owntype);
2765 result = check(tree, capturedType, VAL, resultInfo);
2766 }
2767
2768 public void visitAssignop(JCAssignOp tree) {
2769 // Attribute arguments.
2770 Type owntype = attribTree(tree.lhs, env, varInfo);
2771 Type operand = attribExpr(tree.rhs, env);
2772 // Find operator.
2773 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2774 tree.pos(), tree.getTag().noAssignOp(), env,
2775 owntype, operand);
2776
2777 if (operator.kind == MTH &&
2778 !owntype.isErroneous() &&
2779 !operand.isErroneous()) {
2780 chk.checkOperator(tree.pos(),
2781 (OperatorSymbol)operator,
2782 tree.getTag().noAssignOp(),
2783 owntype,
2784 operand);
2785 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2786 chk.checkCastable(tree.rhs.pos(),
2787 operator.type.getReturnType(),
2788 owntype);
2789 }
2790 result = check(tree, owntype, VAL, resultInfo);
2791 }
2792
2793 public void visitUnary(JCUnary tree) {
2794 // Attribute arguments.
2795 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2796 ? attribTree(tree.arg, env, varInfo)
2797 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2798
2799 // Find operator.
2800 Symbol operator = tree.operator =
2801 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2802
2803 Type owntype = types.createErrorType(tree.type);
2804 if (operator.kind == MTH &&
2805 !argtype.isErroneous()) {
2806 owntype = (tree.getTag().isIncOrDecUnaryOp())
2807 ? tree.arg.type
2808 : operator.type.getReturnType();
2809 int opc = ((OperatorSymbol)operator).opcode;
2810
2811 // If the argument is constant, fold it.
2812 if (argtype.constValue() != null) {
2813 Type ctype = cfolder.fold1(opc, argtype);
2814 if (ctype != null) {
2815 owntype = cfolder.coerce(ctype, owntype);
2816
2817 // Remove constant types from arguments to
2818 // conserve space. The parser will fold concatenations
2819 // of string literals; the code here also
2820 // gets rid of intermediate results when some of the
2821 // operands are constant identifiers.
2822 if (tree.arg.type.tsym == syms.stringType.tsym) {
2823 tree.arg.type = syms.stringType;
2824 }
2825 }
2826 }
2827 }
2828 result = check(tree, owntype, VAL, resultInfo);
2829 }
2830
2831 public void visitBinary(JCBinary tree) {
2832 // Attribute arguments.
2833 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
2834 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
2835
2836 // Find operator.
2837 Symbol operator = tree.operator =
2838 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
2839
2840 Type owntype = types.createErrorType(tree.type);
2841 if (operator.kind == MTH &&
2842 !left.isErroneous() &&
2843 !right.isErroneous()) {
2844 owntype = operator.type.getReturnType();
2845 int opc = chk.checkOperator(tree.lhs.pos(),
2846 (OperatorSymbol)operator,
2847 tree.getTag(),
2848 left,
2849 right);
2850
2851 // If both arguments are constants, fold them.
2852 if (left.constValue() != null && right.constValue() != null) {
2853 Type ctype = cfolder.fold2(opc, left, right);
2854 if (ctype != null) {
2855 owntype = cfolder.coerce(ctype, owntype);
2856
2857 // Remove constant types from arguments to
2858 // conserve space. The parser will fold concatenations
2859 // of string literals; the code here also
2860 // gets rid of intermediate results when some of the
2861 // operands are constant identifiers.
2862 if (tree.lhs.type.tsym == syms.stringType.tsym) {
2863 tree.lhs.type = syms.stringType;
2864 }
2865 if (tree.rhs.type.tsym == syms.stringType.tsym) {
2866 tree.rhs.type = syms.stringType;
2867 }
2868 }
2869 }
2870
2871 // Check that argument types of a reference ==, != are
2872 // castable to each other, (JLS???).
2873 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
2874 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
2875 log.error(tree.pos(), "incomparable.types", left, right);
2876 }
2877 }
2878
2879 chk.checkDivZero(tree.rhs.pos(), operator, right);
2880 }
2881 result = check(tree, owntype, VAL, resultInfo);
2882 }
2883
2884 public void visitTypeCast(final JCTypeCast tree) {
2885 Type clazztype = attribType(tree.clazz, env);
2886 chk.validate(tree.clazz, env, false);
2887 //a fresh environment is required for 292 inference to work properly ---
2888 //see Infer.instantiatePolymorphicSignatureInstance()
2889 Env<AttrContext> localEnv = env.dup(tree);
2890 //should we propagate the target type?
2891 final ResultInfo castInfo;
2892 final boolean isPoly = TreeInfo.isPoly(tree.expr, tree);
2893 if (isPoly) {
2894 //expression is a poly - we need to propagate target type info
2895 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
2896 @Override
2897 public boolean compatible(Type found, Type req, Warner warn) {
2898 return types.isCastable(found, req, warn);
2899 }
2900 });
2901 } else {
2902 //standalone cast - target-type info is not propagated
2903 castInfo = unknownExprInfo;
2904 }
2905 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
2906 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2907 if (exprtype.constValue() != null)
2908 owntype = cfolder.coerce(exprtype, owntype);
2909 result = check(tree, capture(owntype), VAL, resultInfo);
2910 if (!isPoly)
2911 chk.checkRedundantCast(localEnv, tree);
2912 }
2913
2914 public void visitTypeTest(JCInstanceOf tree) {
2915 Type exprtype = chk.checkNullOrRefType(
2916 tree.expr.pos(), attribExpr(tree.expr, env));
2917 Type clazztype = chk.checkReifiableReferenceType(
2918 tree.clazz.pos(), attribType(tree.clazz, env));
2919 chk.validate(tree.clazz, env, false);
2920 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2921 result = check(tree, syms.booleanType, VAL, resultInfo);
2922 }
2923
2924 public void visitIndexed(JCArrayAccess tree) {
2925 Type owntype = types.createErrorType(tree.type);
2926 Type atype = attribExpr(tree.indexed, env);
2927 attribExpr(tree.index, env, syms.intType);
2928 if (types.isArray(atype))
2929 owntype = types.elemtype(atype);
2930 else if (!atype.hasTag(ERROR))
2931 log.error(tree.pos(), "array.req.but.found", atype);
2932 if ((pkind() & VAR) == 0) owntype = capture(owntype);
2933 result = check(tree, owntype, VAR, resultInfo);
2934 }
2935
2936 public void visitIdent(JCIdent tree) {
2937 Symbol sym;
2938
2939 // Find symbol
2940 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
2941 // If we are looking for a method, the prototype `pt' will be a
2942 // method type with the type of the call's arguments as parameters.
2943 env.info.pendingResolutionPhase = null;
2944 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
2945 } else if (tree.sym != null && tree.sym.kind != VAR) {
2946 sym = tree.sym;
2947 } else {
2948 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
2949 }
2950 tree.sym = sym;
2951
2952 // (1) Also find the environment current for the class where
2953 // sym is defined (`symEnv').
2954 // Only for pre-tiger versions (1.4 and earlier):
2955 // (2) Also determine whether we access symbol out of an anonymous
2956 // class in a this or super call. This is illegal for instance
2957 // members since such classes don't carry a this$n link.
2958 // (`noOuterThisPath').
2959 Env<AttrContext> symEnv = env;
2960 boolean noOuterThisPath = false;
2961 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
2962 (sym.kind & (VAR | MTH | TYP)) != 0 &&
2963 sym.owner.kind == TYP &&
2964 tree.name != names._this && tree.name != names._super) {
2965
2966 // Find environment in which identifier is defined.
2967 while (symEnv.outer != null &&
2968 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
2969 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
2970 noOuterThisPath = !allowAnonOuterThis;
2971 symEnv = symEnv.outer;
2972 }
2973 }
2974
2975 // If symbol is a variable, ...
2976 if (sym.kind == VAR) {
2977 VarSymbol v = (VarSymbol)sym;
2978
2979 // ..., evaluate its initializer, if it has one, and check for
2980 // illegal forward reference.
2981 checkInit(tree, env, v, false);
2982
2983 // If we are expecting a variable (as opposed to a value), check
2984 // that the variable is assignable in the current environment.
2985 if (pkind() == VAR)
2986 checkAssignable(tree.pos(), v, null, env);
2987 }
2988
2989 // In a constructor body,
2990 // if symbol is a field or instance method, check that it is
2991 // not accessed before the supertype constructor is called.
2992 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
2993 (sym.kind & (VAR | MTH)) != 0 &&
2994 sym.owner.kind == TYP &&
2995 (sym.flags() & STATIC) == 0) {
2996 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
2997 }
2998 Env<AttrContext> env1 = env;
2999 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3000 // If the found symbol is inaccessible, then it is
3001 // accessed through an enclosing instance. Locate this
3002 // enclosing instance:
3003 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3004 env1 = env1.outer;
3005 }
3006 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3007 }
3008
3009 public void visitSelect(JCFieldAccess tree) {
3010 // Determine the expected kind of the qualifier expression.
3011 int skind = 0;
3012 if (tree.name == names._this || tree.name == names._super ||
3013 tree.name == names._class)
3014 {
3015 skind = TYP;
3016 } else {
3017 if ((pkind() & PCK) != 0) skind = skind | PCK;
3018 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3019 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3020 }
3021
3022 // Attribute the qualifier expression, and determine its symbol (if any).
3023 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3024 if ((pkind() & (PCK | TYP)) == 0)
3025 site = capture(site); // Capture field access
3026
3027 // don't allow T.class T[].class, etc
3028 if (skind == TYP) {
3029 Type elt = site;
3030 while (elt.hasTag(ARRAY))
3031 elt = ((ArrayType)elt).elemtype;
3032 if (elt.hasTag(TYPEVAR)) {
3033 log.error(tree.pos(), "type.var.cant.be.deref");
3034 result = types.createErrorType(tree.type);
3035 return;
3036 }
3037 }
3038
3039 // If qualifier symbol is a type or `super', assert `selectSuper'
3040 // for the selection. This is relevant for determining whether
3041 // protected symbols are accessible.
3042 Symbol sitesym = TreeInfo.symbol(tree.selected);
3043 boolean selectSuperPrev = env.info.selectSuper;
3044 env.info.selectSuper =
3045 sitesym != null &&
3046 sitesym.name == names._super;
3047
3048 // Determine the symbol represented by the selection.
3049 env.info.pendingResolutionPhase = null;
3050 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3051 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3052 site = capture(site);
3053 sym = selectSym(tree, sitesym, site, env, resultInfo);
3054 }
3055 boolean varArgs = env.info.lastResolveVarargs();
3056 tree.sym = sym;
3057
3058 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3059 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3060 site = capture(site);
3061 }
3062
3063 // If that symbol is a variable, ...
3064 if (sym.kind == VAR) {
3065 VarSymbol v = (VarSymbol)sym;
3066
3067 // ..., evaluate its initializer, if it has one, and check for
3068 // illegal forward reference.
3069 checkInit(tree, env, v, true);
3070
3071 // If we are expecting a variable (as opposed to a value), check
3072 // that the variable is assignable in the current environment.
3073 if (pkind() == VAR)
3074 checkAssignable(tree.pos(), v, tree.selected, env);
3075 }
3076
3077 if (sitesym != null &&
3078 sitesym.kind == VAR &&
3079 ((VarSymbol)sitesym).isResourceVariable() &&
3080 sym.kind == MTH &&
3081 sym.name.equals(names.close) &&
3082 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3083 env.info.lint.isEnabled(LintCategory.TRY)) {
3084 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3085 }
3086
3087 // Disallow selecting a type from an expression
3088 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3089 tree.type = check(tree.selected, pt(),
3090 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3091 }
3092
3093 if (isType(sitesym)) {
3094 if (sym.name == names._this) {
3095 // If `C' is the currently compiled class, check that
3096 // C.this' does not appear in a call to a super(...)
3097 if (env.info.isSelfCall &&
3098 site.tsym == env.enclClass.sym) {
3099 chk.earlyRefError(tree.pos(), sym);
3100 }
3101 } else {
3102 // Check if type-qualified fields or methods are static (JLS)
3103 if ((sym.flags() & STATIC) == 0 &&
3104 !env.next.tree.hasTag(REFERENCE) &&
3105 sym.name != names._super &&
3106 (sym.kind == VAR || sym.kind == MTH)) {
3107 rs.accessBase(rs.new StaticError(sym),
3108 tree.pos(), site, sym.name, true);
3109 }
3110 }
3111 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3112 // If the qualified item is not a type and the selected item is static, report
3113 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3114 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3115 }
3116
3117 // If we are selecting an instance member via a `super', ...
3118 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3119
3120 // Check that super-qualified symbols are not abstract (JLS)
3121 rs.checkNonAbstract(tree.pos(), sym);
3122
3123 if (site.isRaw()) {
3124 // Determine argument types for site.
3125 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3126 if (site1 != null) site = site1;
3127 }
3128 }
3129
3130 env.info.selectSuper = selectSuperPrev;
3131 result = checkId(tree, site, sym, env, resultInfo);
3132 }
3133 //where
3134 /** Determine symbol referenced by a Select expression,
3135 *
3136 * @param tree The select tree.
3137 * @param site The type of the selected expression,
3138 * @param env The current environment.
3139 * @param resultInfo The current result.
3140 */
3141 private Symbol selectSym(JCFieldAccess tree,
3142 Symbol location,
3143 Type site,
3144 Env<AttrContext> env,
3145 ResultInfo resultInfo) {
3146 DiagnosticPosition pos = tree.pos();
3147 Name name = tree.name;
3148 switch (site.getTag()) {
3149 case PACKAGE:
3150 return rs.accessBase(
3151 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3152 pos, location, site, name, true);
3153 case ARRAY:
3154 case CLASS:
3155 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3156 return rs.resolveQualifiedMethod(
3157 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3158 } else if (name == names._this || name == names._super) {
3159 return rs.resolveSelf(pos, env, site.tsym, name);
3160 } else if (name == names._class) {
3161 // In this case, we have already made sure in
3162 // visitSelect that qualifier expression is a type.
3163 Type t = syms.classType;
3164 List<Type> typeargs = allowGenerics
3165 ? List.of(types.erasure(site))
3166 : List.<Type>nil();
3167 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3168 return new VarSymbol(
3169 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3170 } else {
3171 // We are seeing a plain identifier as selector.
3172 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3173 if ((resultInfo.pkind & ERRONEOUS) == 0)
3174 sym = rs.accessBase(sym, pos, location, site, name, true);
3175 return sym;
3176 }
3177 case WILDCARD:
3178 throw new AssertionError(tree);
3179 case TYPEVAR:
3180 // Normally, site.getUpperBound() shouldn't be null.
3181 // It should only happen during memberEnter/attribBase
3182 // when determining the super type which *must* beac
3183 // done before attributing the type variables. In
3184 // other words, we are seeing this illegal program:
3185 // class B<T> extends A<T.foo> {}
3186 Symbol sym = (site.getUpperBound() != null)
3187 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3188 : null;
3189 if (sym == null) {
3190 log.error(pos, "type.var.cant.be.deref");
3191 return syms.errSymbol;
3192 } else {
3193 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3194 rs.new AccessError(env, site, sym) :
3195 sym;
3196 rs.accessBase(sym2, pos, location, site, name, true);
3197 return sym;
3198 }
3199 case ERROR:
3200 // preserve identifier names through errors
3201 return types.createErrorType(name, site.tsym, site).tsym;
3202 default:
3203 // The qualifier expression is of a primitive type -- only
3204 // .class is allowed for these.
3205 if (name == names._class) {
3206 // In this case, we have already made sure in Select that
3207 // qualifier expression is a type.
3208 Type t = syms.classType;
3209 Type arg = types.boxedClass(site).type;
3210 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3211 return new VarSymbol(
3212 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3213 } else {
3214 log.error(pos, "cant.deref", site);
3215 return syms.errSymbol;
3216 }
3217 }
3218 }
3219
3220 /** Determine type of identifier or select expression and check that
3221 * (1) the referenced symbol is not deprecated
3222 * (2) the symbol's type is safe (@see checkSafe)
3223 * (3) if symbol is a variable, check that its type and kind are
3224 * compatible with the prototype and protokind.
3225 * (4) if symbol is an instance field of a raw type,
3226 * which is being assigned to, issue an unchecked warning if its
3227 * type changes under erasure.
3228 * (5) if symbol is an instance method of a raw type, issue an
3229 * unchecked warning if its argument types change under erasure.
3230 * If checks succeed:
3231 * If symbol is a constant, return its constant type
3232 * else if symbol is a method, return its result type
3233 * otherwise return its type.
3234 * Otherwise return errType.
3235 *
3236 * @param tree The syntax tree representing the identifier
3237 * @param site If this is a select, the type of the selected
3238 * expression, otherwise the type of the current class.
3239 * @param sym The symbol representing the identifier.
3240 * @param env The current environment.
3241 * @param resultInfo The expected result
3242 */
3243 Type checkId(JCTree tree,
3244 Type site,
3245 Symbol sym,
3246 Env<AttrContext> env,
3247 ResultInfo resultInfo) {
3248 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3249 checkMethodId(tree, site, sym, env, resultInfo) :
3250 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3251 }
3252
3253 Type checkMethodId(JCTree tree,
3254 Type site,
3255 Symbol sym,
3256 Env<AttrContext> env,
3257 ResultInfo resultInfo) {
3258 boolean isPolymorhicSignature =
3259 sym.kind == MTH && ((MethodSymbol)sym.baseSymbol()).isSignaturePolymorphic(types);
3260 return isPolymorhicSignature ?
3261 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3262 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3263 }
3264
3265 Type checkSigPolyMethodId(JCTree tree,
3266 Type site,
3267 Symbol sym,
3268 Env<AttrContext> env,
3269 ResultInfo resultInfo) {
3270 //recover original symbol for signature polymorphic methods
3271 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3272 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3273 return sym.type;
3274 }
3275
3276 Type checkMethodIdInternal(JCTree tree,
3277 Type site,
3278 Symbol sym,
3279 Env<AttrContext> env,
3280 ResultInfo resultInfo) {
3281 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3282 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3283 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3284 return owntype;
3285 }
3286
3287 Type checkIdInternal(JCTree tree,
3288 Type site,
3289 Symbol sym,
3290 Type pt,
3291 Env<AttrContext> env,
3292 ResultInfo resultInfo) {
3293 if (pt.isErroneous()) {
3294 return types.createErrorType(site);
3295 }
3296 Type owntype; // The computed type of this identifier occurrence.
3297 switch (sym.kind) {
3298 case TYP:
3299 // For types, the computed type equals the symbol's type,
3300 // except for two situations:
3301 owntype = sym.type;
3302 if (owntype.hasTag(CLASS)) {
3303 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3304 Type ownOuter = owntype.getEnclosingType();
3305
3306 // (a) If the symbol's type is parameterized, erase it
3307 // because no type parameters were given.
3308 // We recover generic outer type later in visitTypeApply.
3309 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3310 owntype = types.erasure(owntype);
3311 }
3312
3313 // (b) If the symbol's type is an inner class, then
3314 // we have to interpret its outer type as a superclass
3315 // of the site type. Example:
3316 //
3317 // class Tree<A> { class Visitor { ... } }
3318 // class PointTree extends Tree<Point> { ... }
3319 // ...PointTree.Visitor...
3320 //
3321 // Then the type of the last expression above is
3322 // Tree<Point>.Visitor.
3323 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3324 Type normOuter = site;
3325 if (normOuter.hasTag(CLASS)) {
3326 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3327 if (site.getKind() == TypeKind.ANNOTATED) {
3328 // Propagate any type annotations.
3329 // TODO: should asEnclosingSuper do this?
3330 // Note that the type annotations in site will be updated
3331 // by annotateType. Therefore, modify site instead
3332 // of creating a new AnnotatedType.
3333 ((AnnotatedType)site).underlyingType = normOuter;
3334 normOuter = site;
3335 }
3336 }
3337 if (normOuter == null) // perhaps from an import
3338 normOuter = types.erasure(ownOuter);
3339 if (normOuter != ownOuter)
3340 owntype = new ClassType(
3341 normOuter, List.<Type>nil(), owntype.tsym);
3342 }
3343 }
3344 break;
3345 case VAR:
3346 VarSymbol v = (VarSymbol)sym;
3347 // Test (4): if symbol is an instance field of a raw type,
3348 // which is being assigned to, issue an unchecked warning if
3349 // its type changes under erasure.
3350 if (allowGenerics &&
3351 resultInfo.pkind == VAR &&
3352 v.owner.kind == TYP &&
3353 (v.flags() & STATIC) == 0 &&
3354 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3355 Type s = types.asOuterSuper(site, v.owner);
3356 if (s != null &&
3357 s.isRaw() &&
3358 !types.isSameType(v.type, v.erasure(types))) {
3359 chk.warnUnchecked(tree.pos(),
3360 "unchecked.assign.to.var",
3361 v, s);
3362 }
3363 }
3364 // The computed type of a variable is the type of the
3365 // variable symbol, taken as a member of the site type.
3366 owntype = (sym.owner.kind == TYP &&
3367 sym.name != names._this && sym.name != names._super)
3368 ? types.memberType(site, sym)
3369 : sym.type;
3370
3371 // If the variable is a constant, record constant value in
3372 // computed type.
3373 if (v.getConstValue() != null && isStaticReference(tree))
3374 owntype = owntype.constType(v.getConstValue());
3375
3376 if (resultInfo.pkind == VAL) {
3377 owntype = capture(owntype); // capture "names as expressions"
3378 }
3379 break;
3380 case MTH: {
3381 owntype = checkMethod(site, sym,
3382 new ResultInfo(VAL, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3383 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3384 resultInfo.pt.getTypeArguments());
3385 break;
3386 }
3387 case PCK: case ERR:
3388 owntype = sym.type;
3389 break;
3390 default:
3391 throw new AssertionError("unexpected kind: " + sym.kind +
3392 " in tree " + tree);
3393 }
3394
3395 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3396 // (for constructors, the error was given when the constructor was
3397 // resolved)
3398
3399 if (sym.name != names.init) {
3400 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3401 chk.checkSunAPI(tree.pos(), sym);
3402 }
3403
3404 // Test (3): if symbol is a variable, check that its type and
3405 // kind are compatible with the prototype and protokind.
3406 return check(tree, owntype, sym.kind, resultInfo);
3407 }
3408
3409 /** Check that variable is initialized and evaluate the variable's
3410 * initializer, if not yet done. Also check that variable is not
3411 * referenced before it is defined.
3412 * @param tree The tree making up the variable reference.
3413 * @param env The current environment.
3414 * @param v The variable's symbol.
3415 */
3416 private void checkInit(JCTree tree,
3417 Env<AttrContext> env,
3418 VarSymbol v,
3419 boolean onlyWarning) {
3420 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3421 // tree.pos + " " + v.pos + " " +
3422 // Resolve.isStatic(env));//DEBUG
3423
3424 // A forward reference is diagnosed if the declaration position
3425 // of the variable is greater than the current tree position
3426 // and the tree and variable definition occur in the same class
3427 // definition. Note that writes don't count as references.
3428 // This check applies only to class and instance
3429 // variables. Local variables follow different scope rules,
3430 // and are subject to definite assignment checking.
3431 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3432 v.owner.kind == TYP &&
3433 canOwnInitializer(owner(env)) &&
3434 v.owner == env.info.scope.owner.enclClass() &&
3435 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3436 (!env.tree.hasTag(ASSIGN) ||
3437 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3438 String suffix = (env.info.enclVar == v) ?
3439 "self.ref" : "forward.ref";
3440 if (!onlyWarning || isStaticEnumField(v)) {
3441 log.error(tree.pos(), "illegal." + suffix);
3442 } else if (useBeforeDeclarationWarning) {
3443 log.warning(tree.pos(), suffix, v);
3444 }
3445 }
3446
3447 v.getConstValue(); // ensure initializer is evaluated
3448
3449 checkEnumInitializer(tree, env, v);
3450 }
3451
3452 /**
3453 * Check for illegal references to static members of enum. In
3454 * an enum type, constructors and initializers may not
3455 * reference its static members unless they are constant.
3456 *
3457 * @param tree The tree making up the variable reference.
3458 * @param env The current environment.
3459 * @param v The variable's symbol.
3460 * @jls section 8.9 Enums
3461 */
3462 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3463 // JLS:
3464 //
3465 // "It is a compile-time error to reference a static field
3466 // of an enum type that is not a compile-time constant
3467 // (15.28) from constructors, instance initializer blocks,
3468 // or instance variable initializer expressions of that
3469 // type. It is a compile-time error for the constructors,
3470 // instance initializer blocks, or instance variable
3471 // initializer expressions of an enum constant e to refer
3472 // to itself or to an enum constant of the same type that
3473 // is declared to the right of e."
3474 if (isStaticEnumField(v)) {
3475 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3476
3477 if (enclClass == null || enclClass.owner == null)
3478 return;
3479
3480 // See if the enclosing class is the enum (or a
3481 // subclass thereof) declaring v. If not, this
3482 // reference is OK.
3483 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3484 return;
3485
3486 // If the reference isn't from an initializer, then
3487 // the reference is OK.
3488 if (!Resolve.isInitializer(env))
3489 return;
3490
3491 log.error(tree.pos(), "illegal.enum.static.ref");
3492 }
3493 }
3494
3495 /** Is the given symbol a static, non-constant field of an Enum?
3496 * Note: enum literals should not be regarded as such
3497 */
3498 private boolean isStaticEnumField(VarSymbol v) {
3499 return Flags.isEnum(v.owner) &&
3500 Flags.isStatic(v) &&
3501 !Flags.isConstant(v) &&
3502 v.name != names._class;
3503 }
3504
3505 /** Can the given symbol be the owner of code which forms part
3506 * if class initialization? This is the case if the symbol is
3507 * a type or field, or if the symbol is the synthetic method.
3508 * owning a block.
3509 */
3510 private boolean canOwnInitializer(Symbol sym) {
3511 return
3512 (sym.kind & (VAR | TYP)) != 0 ||
3513 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3514 }
3515
3516 Warner noteWarner = new Warner();
3517
3518 /**
3519 * Check that method arguments conform to its instantiation.
3520 **/
3521 public Type checkMethod(Type site,
3522 Symbol sym,
3523 ResultInfo resultInfo,
3524 Env<AttrContext> env,
3525 final List<JCExpression> argtrees,
3526 List<Type> argtypes,
3527 List<Type> typeargtypes) {
3528 // Test (5): if symbol is an instance method of a raw type, issue
3529 // an unchecked warning if its argument types change under erasure.
3530 if (allowGenerics &&
3531 (sym.flags() & STATIC) == 0 &&
3532 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3533 Type s = types.asOuterSuper(site, sym.owner);
3534 if (s != null && s.isRaw() &&
3535 !types.isSameTypes(sym.type.getParameterTypes(),
3536 sym.erasure(types).getParameterTypes())) {
3537 chk.warnUnchecked(env.tree.pos(),
3538 "unchecked.call.mbr.of.raw.type",
3539 sym, s);
3540 }
3541 }
3542
3543 if (env.info.defaultSuperCallSite != null) {
3544 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3545 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3546 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3547 List<MethodSymbol> icand_sup =
3548 types.interfaceCandidates(sup, (MethodSymbol)sym);
3549 if (icand_sup.nonEmpty() &&
3550 icand_sup.head != sym &&
3551 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3552 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3553 diags.fragment("overridden.default", sym, sup));
3554 break;
3555 }
3556 }
3557 env.info.defaultSuperCallSite = null;
3558 }
3559
3560 if (sym.isStatic() && site.isInterface()) {
3561 Assert.check(env.tree.hasTag(APPLY));
3562 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3563 if (app.meth.hasTag(SELECT) &&
3564 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3565 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3566 }
3567 }
3568
3569 // Compute the identifier's instantiated type.
3570 // For methods, we need to compute the instance type by
3571 // Resolve.instantiate from the symbol's type as well as
3572 // any type arguments and value arguments.
3573 noteWarner.clear();
3574 try {
3575 Type owntype = rs.checkMethod(
3576 env,
3577 site,
3578 sym,
3579 resultInfo,
3580 argtypes,
3581 typeargtypes,
3582 noteWarner);
3583
3584 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3585 noteWarner.hasNonSilentLint(LintCategory.UNCHECKED));
3586 } catch (Infer.InferenceException ex) {
3587 //invalid target type - propagate exception outwards or report error
3588 //depending on the current check context
3589 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3590 return types.createErrorType(site);
3591 } catch (Resolve.InapplicableMethodException ex) {
3592 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3593 return null;
3594 }
3595 }
3596
3597 public void visitLiteral(JCLiteral tree) {
3598 result = check(
3599 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3600 }
3601 //where
3602 /** Return the type of a literal with given type tag.
3603 */
3604 Type litType(TypeTag tag) {
3605 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3606 }
3607
3608 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3609 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3610 }
3611
3612 public void visitTypeArray(JCArrayTypeTree tree) {
3613 Type etype = attribType(tree.elemtype, env);
3614 Type type = new ArrayType(etype, syms.arrayClass);
3615 result = check(tree, type, TYP, resultInfo);
3616 }
3617
3618 /** Visitor method for parameterized types.
3619 * Bound checking is left until later, since types are attributed
3620 * before supertype structure is completely known
3621 */
3622 public void visitTypeApply(JCTypeApply tree) {
3623 Type owntype = types.createErrorType(tree.type);
3624
3625 // Attribute functor part of application and make sure it's a class.
3626 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3627
3628 // Attribute type parameters
3629 List<Type> actuals = attribTypes(tree.arguments, env);
3630
3631 if (clazztype.hasTag(CLASS)) {
3632 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3633 if (actuals.isEmpty()) //diamond
3634 actuals = formals;
3635
3636 if (actuals.length() == formals.length()) {
3637 List<Type> a = actuals;
3638 List<Type> f = formals;
3639 while (a.nonEmpty()) {
3640 a.head = a.head.withTypeVar(f.head);
3641 a = a.tail;
3642 f = f.tail;
3643 }
3644 // Compute the proper generic outer
3645 Type clazzOuter = clazztype.getEnclosingType();
3646 if (clazzOuter.hasTag(CLASS)) {
3647 Type site;
3648 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3649 if (clazz.hasTag(IDENT)) {
3650 site = env.enclClass.sym.type;
3651 } else if (clazz.hasTag(SELECT)) {
3652 site = ((JCFieldAccess) clazz).selected.type;
3653 } else throw new AssertionError(""+tree);
3654 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3655 if (site.hasTag(CLASS))
3656 site = types.asOuterSuper(site, clazzOuter.tsym);
3657 if (site == null)
3658 site = types.erasure(clazzOuter);
3659 clazzOuter = site;
3660 }
3661 }
3662 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3663 } else {
3664 if (formals.length() != 0) {
3665 log.error(tree.pos(), "wrong.number.type.args",
3666 Integer.toString(formals.length()));
3667 } else {
3668 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3669 }
3670 owntype = types.createErrorType(tree.type);
3671 }
3672 }
3673 result = check(tree, owntype, TYP, resultInfo);
3674 }
3675
3676 public void visitTypeUnion(JCTypeUnion tree) {
3677 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3678 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3679 for (JCExpression typeTree : tree.alternatives) {
3680 Type ctype = attribType(typeTree, env);
3681 ctype = chk.checkType(typeTree.pos(),
3682 chk.checkClassType(typeTree.pos(), ctype),
3683 syms.throwableType);
3684 if (!ctype.isErroneous()) {
3685 //check that alternatives of a union type are pairwise
3686 //unrelated w.r.t. subtyping
3687 if (chk.intersects(ctype, multicatchTypes.toList())) {
3688 for (Type t : multicatchTypes) {
3689 boolean sub = types.isSubtype(ctype, t);
3690 boolean sup = types.isSubtype(t, ctype);
3691 if (sub || sup) {
3692 //assume 'a' <: 'b'
3693 Type a = sub ? ctype : t;
3694 Type b = sub ? t : ctype;
3695 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3696 }
3697 }
3698 }
3699 multicatchTypes.append(ctype);
3700 if (all_multicatchTypes != null)
3701 all_multicatchTypes.append(ctype);
3702 } else {
3703 if (all_multicatchTypes == null) {
3704 all_multicatchTypes = ListBuffer.lb();
3705 all_multicatchTypes.appendList(multicatchTypes);
3706 }
3707 all_multicatchTypes.append(ctype);
3708 }
3709 }
3710 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3711 if (t.hasTag(CLASS)) {
3712 List<Type> alternatives =
3713 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3714 t = new UnionClassType((ClassType) t, alternatives);
3715 }
3716 tree.type = result = t;
3717 }
3718
3719 public void visitTypeIntersection(JCTypeIntersection tree) {
3720 attribTypes(tree.bounds, env);
3721 tree.type = result = checkIntersection(tree, tree.bounds);
3722 }
3723
3724 public void visitTypeParameter(JCTypeParameter tree) {
3725 TypeVar typeVar = (TypeVar) tree.type;
3726
3727 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3728 AnnotatedType antype = new AnnotatedType(typeVar);
3729 annotateType(antype, tree.annotations);
3730 tree.type = antype;
3731 }
3732
3733 if (!typeVar.bound.isErroneous()) {
3734 //fixup type-parameter bound computed in 'attribTypeVariables'
3735 typeVar.bound = checkIntersection(tree, tree.bounds);
3736 }
3737 }
3738
3739 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3740 Set<Type> boundSet = new HashSet<Type>();
3741 if (bounds.nonEmpty()) {
3742 // accept class or interface or typevar as first bound.
3743 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3744 boundSet.add(types.erasure(bounds.head.type));
3745 if (bounds.head.type.isErroneous()) {
3746 return bounds.head.type;
3747 }
3748 else if (bounds.head.type.hasTag(TYPEVAR)) {
3749 // if first bound was a typevar, do not accept further bounds.
3750 if (bounds.tail.nonEmpty()) {
3751 log.error(bounds.tail.head.pos(),
3752 "type.var.may.not.be.followed.by.other.bounds");
3753 return bounds.head.type;
3754 }
3755 } else {
3756 // if first bound was a class or interface, accept only interfaces
3757 // as further bounds.
3758 for (JCExpression bound : bounds.tail) {
3759 bound.type = checkBase(bound.type, bound, env, false, true, false);
3760 if (bound.type.isErroneous()) {
3761 bounds = List.of(bound);
3762 }
3763 else if (bound.type.hasTag(CLASS)) {
3764 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3765 }
3766 }
3767 }
3768 }
3769
3770 if (bounds.length() == 0) {
3771 return syms.objectType;
3772 } else if (bounds.length() == 1) {
3773 return bounds.head.type;
3774 } else {
3775 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3776 if (tree.hasTag(TYPEINTERSECTION)) {
3777 ((IntersectionClassType)owntype).intersectionKind =
3778 IntersectionClassType.IntersectionKind.EXPLICIT;
3779 }
3780 // ... the variable's bound is a class type flagged COMPOUND
3781 // (see comment for TypeVar.bound).
3782 // In this case, generate a class tree that represents the
3783 // bound class, ...
3784 JCExpression extending;
3785 List<JCExpression> implementing;
3786 if (!bounds.head.type.isInterface()) {
3787 extending = bounds.head;
3788 implementing = bounds.tail;
3789 } else {
3790 extending = null;
3791 implementing = bounds;
3792 }
3793 JCClassDecl cd = make.at(tree).ClassDef(
3794 make.Modifiers(PUBLIC | ABSTRACT),
3795 names.empty, List.<JCTypeParameter>nil(),
3796 extending, implementing, List.<JCTree>nil());
3797
3798 ClassSymbol c = (ClassSymbol)owntype.tsym;
3799 Assert.check((c.flags() & COMPOUND) != 0);
3800 cd.sym = c;
3801 c.sourcefile = env.toplevel.sourcefile;
3802
3803 // ... and attribute the bound class
3804 c.flags_field |= UNATTRIBUTED;
3805 Env<AttrContext> cenv = enter.classEnv(cd, env);
3806 enter.typeEnvs.put(c, cenv);
3807 attribClass(c);
3808 return owntype;
3809 }
3810 }
3811
3812 public void visitWildcard(JCWildcard tree) {
3813 //- System.err.println("visitWildcard("+tree+");");//DEBUG
3814 Type type = (tree.kind.kind == BoundKind.UNBOUND)
3815 ? syms.objectType
3816 : attribType(tree.inner, env);
3817 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
3818 tree.kind.kind,
3819 syms.boundClass),
3820 TYP, resultInfo);
3821 }
3822
3823 public void visitAnnotation(JCAnnotation tree) {
3824 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
3825 result = tree.type = syms.errType;
3826 }
3827
3828 public void visitAnnotatedType(JCAnnotatedType tree) {
3829 Type underlyingType = attribType(tree.getUnderlyingType(), env);
3830 this.attribAnnotationTypes(tree.annotations, env);
3831 AnnotatedType antype = new AnnotatedType(underlyingType);
3832 annotateType(antype, tree.annotations);
3833 result = tree.type = antype;
3834 }
3835
3836 /**
3837 * Apply the annotations to the particular type.
3838 */
3839 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
3840 if (annotations.isEmpty())
3841 return;
3842 annotate.typeAnnotation(new Annotate.Annotator() {
3843 @Override
3844 public String toString() {
3845 return "annotate " + annotations + " onto " + type;
3846 }
3847 @Override
3848 public void enterAnnotation() {
3849 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
3850 type.typeAnnotations = compounds;
3851 }
3852 });
3853 }
3854
3855 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
3856 if (annotations.isEmpty())
3857 return List.nil();
3858
3859 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
3860 for (JCAnnotation anno : annotations) {
3861 buf.append((Attribute.TypeCompound) anno.attribute);
3862 }
3863 return buf.toList();
3864 }
3865
3866 public void visitErroneous(JCErroneous tree) {
3867 if (tree.errs != null)
3868 for (JCTree err : tree.errs)
3869 attribTree(err, env, new ResultInfo(ERR, pt()));
3870 result = tree.type = syms.errType;
3871 }
3872
3873 /** Default visitor method for all other trees.
3874 */
3875 public void visitTree(JCTree tree) {
3876 throw new AssertionError();
3877 }
3878
3879 /**
3880 * Attribute an env for either a top level tree or class declaration.
3881 */
3882 public void attrib(Env<AttrContext> env) {
3883 if (env.tree.hasTag(TOPLEVEL))
3884 attribTopLevel(env);
3885 else
3886 attribClass(env.tree.pos(), env.enclClass.sym);
3887 }
3888
3889 /**
3890 * Attribute a top level tree. These trees are encountered when the
3891 * package declaration has annotations.
3892 */
3893 public void attribTopLevel(Env<AttrContext> env) {
3894 JCCompilationUnit toplevel = env.toplevel;
3895 try {
3896 annotate.flush();
3897 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
3898 } catch (CompletionFailure ex) {
3899 chk.completionError(toplevel.pos(), ex);
3900 }
3901 }
3902
3903 /** Main method: attribute class definition associated with given class symbol.
3904 * reporting completion failures at the given position.
3905 * @param pos The source position at which completion errors are to be
3906 * reported.
3907 * @param c The class symbol whose definition will be attributed.
3908 */
3909 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
3910 try {
3911 annotate.flush();
3912 attribClass(c);
3913 } catch (CompletionFailure ex) {
3914 chk.completionError(pos, ex);
3915 }
3916 }
3917
3918 /** Attribute class definition associated with given class symbol.
3919 * @param c The class symbol whose definition will be attributed.
3920 */
3921 void attribClass(ClassSymbol c) throws CompletionFailure {
3922 if (c.type.hasTag(ERROR)) return;
3923
3924 // Check for cycles in the inheritance graph, which can arise from
3925 // ill-formed class files.
3926 chk.checkNonCyclic(null, c.type);
3927
3928 Type st = types.supertype(c.type);
3929 if ((c.flags_field & Flags.COMPOUND) == 0) {
3930 // First, attribute superclass.
3931 if (st.hasTag(CLASS))
3932 attribClass((ClassSymbol)st.tsym);
3933
3934 // Next attribute owner, if it is a class.
3935 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
3936 attribClass((ClassSymbol)c.owner);
3937 }
3938
3939 // The previous operations might have attributed the current class
3940 // if there was a cycle. So we test first whether the class is still
3941 // UNATTRIBUTED.
3942 if ((c.flags_field & UNATTRIBUTED) != 0) {
3943 c.flags_field &= ~UNATTRIBUTED;
3944
3945 // Get environment current at the point of class definition.
3946 Env<AttrContext> env = enter.typeEnvs.get(c);
3947
3948 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
3949 // because the annotations were not available at the time the env was created. Therefore,
3950 // we look up the environment chain for the first enclosing environment for which the
3951 // lint value is set. Typically, this is the parent env, but might be further if there
3952 // are any envs created as a result of TypeParameter nodes.
3953 Env<AttrContext> lintEnv = env;
3954 while (lintEnv.info.lint == null)
3955 lintEnv = lintEnv.next;
3956
3957 // Having found the enclosing lint value, we can initialize the lint value for this class
3958 env.info.lint = lintEnv.info.lint.augment(c.annotations, c.flags());
3959
3960 Lint prevLint = chk.setLint(env.info.lint);
3961 JavaFileObject prev = log.useSource(c.sourcefile);
3962 ResultInfo prevReturnRes = env.info.returnResult;
3963
3964 try {
3965 env.info.returnResult = null;
3966 // java.lang.Enum may not be subclassed by a non-enum
3967 if (st.tsym == syms.enumSym &&
3968 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
3969 log.error(env.tree.pos(), "enum.no.subclassing");
3970
3971 // Enums may not be extended by source-level classes
3972 if (st.tsym != null &&
3973 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
3974 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
3975 !target.compilerBootstrap(c)) {
3976 log.error(env.tree.pos(), "enum.types.not.extensible");
3977 }
3978 attribClassBody(env, c);
3979
3980 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
3981 } finally {
3982 env.info.returnResult = prevReturnRes;
3983 log.useSource(prev);
3984 chk.setLint(prevLint);
3985 }
3986
3987 }
3988 }
3989
3990 public void visitImport(JCImport tree) {
3991 // nothing to do
3992 }
3993
3994 /** Finish the attribution of a class. */
3995 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
3996 JCClassDecl tree = (JCClassDecl)env.tree;
3997 Assert.check(c == tree.sym);
3998
3999 // Validate annotations
4000 chk.validateAnnotations(tree.mods.annotations, c);
4001
4002 // Validate type parameters, supertype and interfaces.
4003 attribStats(tree.typarams, env);
4004 if (!c.isAnonymous()) {
4005 //already checked if anonymous
4006 chk.validate(tree.typarams, env);
4007 chk.validate(tree.extending, env);
4008 chk.validate(tree.implementing, env);
4009 }
4010
4011 // If this is a non-abstract class, check that it has no abstract
4012 // methods or unimplemented methods of an implemented interface.
4013 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4014 if (!relax)
4015 chk.checkAllDefined(tree.pos(), c);
4016 }
4017
4018 if ((c.flags() & ANNOTATION) != 0) {
4019 if (tree.implementing.nonEmpty())
4020 log.error(tree.implementing.head.pos(),
4021 "cant.extend.intf.annotation");
4022 if (tree.typarams.nonEmpty())
4023 log.error(tree.typarams.head.pos(),
4024 "intf.annotation.cant.have.type.params");
4025
4026 // If this annotation has a @Repeatable, validate
4027 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4028 if (repeatable != null) {
4029 // get diagnostic position for error reporting
4030 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4031 Assert.checkNonNull(cbPos);
4032
4033 chk.validateRepeatable(c, repeatable, cbPos);
4034 }
4035 } else {
4036 // Check that all extended classes and interfaces
4037 // are compatible (i.e. no two define methods with same arguments
4038 // yet different return types). (JLS 8.4.6.3)
4039 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4040 if (allowDefaultMethods) {
4041 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4042 }
4043 }
4044
4045 // Check that class does not import the same parameterized interface
4046 // with two different argument lists.
4047 chk.checkClassBounds(tree.pos(), c.type);
4048
4049 tree.type = c.type;
4050
4051 for (List<JCTypeParameter> l = tree.typarams;
4052 l.nonEmpty(); l = l.tail) {
4053 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4054 }
4055
4056 // Check that a generic class doesn't extend Throwable
4057 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4058 log.error(tree.extending.pos(), "generic.throwable");
4059
4060 // Check that all methods which implement some
4061 // method conform to the method they implement.
4062 chk.checkImplementations(tree);
4063
4064 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4065 checkAutoCloseable(tree.pos(), env, c.type);
4066
4067 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4068 // Attribute declaration
4069 attribStat(l.head, env);
4070 // Check that declarations in inner classes are not static (JLS 8.1.2)
4071 // Make an exception for static constants.
4072 if (c.owner.kind != PCK &&
4073 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4074 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4075 Symbol sym = null;
4076 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4077 if (sym == null ||
4078 sym.kind != VAR ||
4079 ((VarSymbol) sym).getConstValue() == null)
4080 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4081 }
4082 }
4083
4084 // Check for cycles among non-initial constructors.
4085 chk.checkCyclicConstructors(tree);
4086
4087 // Check for cycles among annotation elements.
4088 chk.checkNonCyclicElements(tree);
4089
4090 // Check for proper use of serialVersionUID
4091 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4092 isSerializable(c) &&
4093 (c.flags() & Flags.ENUM) == 0 &&
4094 (c.flags() & ABSTRACT) == 0) {
4095 checkSerialVersionUID(tree, c);
4096 }
4097
4098 // Correctly organize the postions of the type annotations
4099 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4100
4101 // Check type annotations applicability rules
4102 validateTypeAnnotations(tree);
4103 }
4104 // where
4105 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4106 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4107 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4108 if (types.isSameType(al.head.annotationType.type, t))
4109 return al.head.pos();
4110 }
4111
4112 return null;
4113 }
4114
4115 /** check if a class is a subtype of Serializable, if that is available. */
4116 private boolean isSerializable(ClassSymbol c) {
4117 try {
4118 syms.serializableType.complete();
4119 }
4120 catch (CompletionFailure e) {
4121 return false;
4122 }
4123 return types.isSubtype(c.type, syms.serializableType);
4124 }
4125
4126 /** Check that an appropriate serialVersionUID member is defined. */
4127 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4128
4129 // check for presence of serialVersionUID
4130 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4131 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4132 if (e.scope == null) {
4133 log.warning(LintCategory.SERIAL,
4134 tree.pos(), "missing.SVUID", c);
4135 return;
4136 }
4137
4138 // check that it is static final
4139 VarSymbol svuid = (VarSymbol)e.sym;
4140 if ((svuid.flags() & (STATIC | FINAL)) !=
4141 (STATIC | FINAL))
4142 log.warning(LintCategory.SERIAL,
4143 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4144
4145 // check that it is long
4146 else if (!svuid.type.hasTag(LONG))
4147 log.warning(LintCategory.SERIAL,
4148 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4149
4150 // check constant
4151 else if (svuid.getConstValue() == null)
4152 log.warning(LintCategory.SERIAL,
4153 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4154 }
4155
4156 private Type capture(Type type) {
4157 //do not capture free types
4158 return resultInfo.checkContext.inferenceContext().free(type) ?
4159 type : types.capture(type);
4160 }
4161
4162 private void validateTypeAnnotations(JCTree tree) {
4163 tree.accept(typeAnnotationsValidator);
4164 }
4165 //where
4166 private final JCTree.Visitor typeAnnotationsValidator =
4167 new TreeScanner() {
4168 public void visitAnnotation(JCAnnotation tree) {
4169 if (tree.hasTag(TYPE_ANNOTATION)) {
4170 // TODO: It seems to WMD as if the annotation in
4171 // parameters, in particular also the recvparam, are never
4172 // of type JCTypeAnnotation and therefore never checked!
4173 // Luckily this check doesn't really do anything that isn't
4174 // also done elsewhere.
4175 chk.validateTypeAnnotation(tree, false);
4176 }
4177 super.visitAnnotation(tree);
4178 }
4179 public void visitTypeParameter(JCTypeParameter tree) {
4180 chk.validateTypeAnnotations(tree.annotations, true);
4181 scan(tree.bounds);
4182 // Don't call super.
4183 // This is needed because above we call validateTypeAnnotation with
4184 // false, which would forbid annotations on type parameters.
4185 // super.visitTypeParameter(tree);
4186 }
4187 public void visitMethodDef(JCMethodDecl tree) {
4188 // Static methods cannot have receiver type annotations.
4189 // In test case FailOver15.java, the nested method getString has
4190 // a null sym, because an unknown class is instantiated.
4191 // I would say it's safe to skip.
4192 if (tree.sym != null && (tree.sym.flags() & Flags.STATIC) != 0) {
4193 if (tree.recvparam != null) {
4194 // TODO: better error message. Is the pos good?
4195 log.error(tree.recvparam.pos(), "annotation.type.not.applicable");
4196 }
4197 }
4198 if (tree.restype != null && tree.restype.type != null) {
4199 validateAnnotatedType(tree.restype, tree.restype.type);
4200 }
4201 super.visitMethodDef(tree);
4202 }
4203 public void visitVarDef(final JCVariableDecl tree) {
4204 if (tree.sym != null && tree.sym.type != null)
4205 validateAnnotatedType(tree, tree.sym.type);
4206 super.visitVarDef(tree);
4207 }
4208 public void visitTypeCast(JCTypeCast tree) {
4209 if (tree.clazz != null && tree.clazz.type != null)
4210 validateAnnotatedType(tree.clazz, tree.clazz.type);
4211 super.visitTypeCast(tree);
4212 }
4213 public void visitTypeTest(JCInstanceOf tree) {
4214 if (tree.clazz != null && tree.clazz.type != null)
4215 validateAnnotatedType(tree.clazz, tree.clazz.type);
4216 super.visitTypeTest(tree);
4217 }
4218 // TODO: what else do we need?
4219 // public void visitNewClass(JCNewClass tree) {
4220 // public void visitNewArray(JCNewArray tree) {
4221
4222 /* I would want to model this after
4223 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4224 * and override visitSelect and visitTypeApply.
4225 * However, we only set the annotated type in the top-level type
4226 * of the symbol.
4227 * Therefore, we need to override each individual location where a type
4228 * can occur.
4229 */
4230 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4231 if (type.getEnclosingType() != null &&
4232 type != type.getEnclosingType()) {
4233 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4234 }
4235 for (Type targ : type.getTypeArguments()) {
4236 validateAnnotatedType(errtree, targ);
4237 }
4238 }
4239 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4240 validateAnnotatedType(errtree, type);
4241 if (type.tsym != null &&
4242 type.tsym.isStatic() &&
4243 type.getAnnotations().nonEmpty()) {
4244 // Enclosing static classes cannot have type annotations.
4245 log.error(errtree.pos(), "cant.annotate.static.class");
4246 }
4247 }
4248 };
4249
4250 // <editor-fold desc="post-attribution visitor">
4251
4252 /**
4253 * Handle missing types/symbols in an AST. This routine is useful when
4254 * the compiler has encountered some errors (which might have ended up
4255 * terminating attribution abruptly); if the compiler is used in fail-over
4256 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4257 * prevents NPE to be progagated during subsequent compilation steps.
4258 */
4259 public void postAttr(JCTree tree) {
4260 new PostAttrAnalyzer().scan(tree);
4261 }
4262
4263 class PostAttrAnalyzer extends TreeScanner {
4264
4265 private void initTypeIfNeeded(JCTree that) {
4266 if (that.type == null) {
4267 that.type = syms.unknownType;
4268 }
4269 }
4270
4271 @Override
4272 public void scan(JCTree tree) {
4273 if (tree == null) return;
4274 if (tree instanceof JCExpression) {
4275 initTypeIfNeeded(tree);
4276 }
4277 super.scan(tree);
4278 }
4279
4280 @Override
4281 public void visitIdent(JCIdent that) {
4282 if (that.sym == null) {
4283 that.sym = syms.unknownSymbol;
4284 }
4285 }
4286
4287 @Override
4288 public void visitSelect(JCFieldAccess that) {
4289 if (that.sym == null) {
4290 that.sym = syms.unknownSymbol;
4291 }
4292 super.visitSelect(that);
4293 }
4294
4295 @Override
4296 public void visitClassDef(JCClassDecl that) {
4297 initTypeIfNeeded(that);
4298 if (that.sym == null) {
4299 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4300 }
4301 super.visitClassDef(that);
4302 }
4303
4304 @Override
4305 public void visitMethodDef(JCMethodDecl that) {
4306 initTypeIfNeeded(that);
4307 if (that.sym == null) {
4308 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4309 }
4310 super.visitMethodDef(that);
4311 }
4312
4313 @Override
4314 public void visitVarDef(JCVariableDecl that) {
4315 initTypeIfNeeded(that);
4316 if (that.sym == null) {
4317 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4318 that.sym.adr = 0;
4319 }
4320 super.visitVarDef(that);
4321 }
4322
4323 @Override
4324 public void visitNewClass(JCNewClass that) {
4325 if (that.constructor == null) {
4326 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4327 }
4328 if (that.constructorType == null) {
4329 that.constructorType = syms.unknownType;
4330 }
4331 super.visitNewClass(that);
4332 }
4333
4334 @Override
4335 public void visitAssignop(JCAssignOp that) {
4336 if (that.operator == null)
4337 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4338 super.visitAssignop(that);
4339 }
4340
4341 @Override
4342 public void visitBinary(JCBinary that) {
4343 if (that.operator == null)
4344 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4345 super.visitBinary(that);
4346 }
4347
4348 @Override
4349 public void visitUnary(JCUnary that) {
4350 if (that.operator == null)
4351 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4352 super.visitUnary(that);
4353 }
4354
4355 @Override
4356 public void visitLambda(JCLambda that) {
4357 super.visitLambda(that);
4358 if (that.descriptorType == null) {
4359 that.descriptorType = syms.unknownType;
4360 }
4361 if (that.targets == null) {
4362 that.targets = List.nil();
4363 }
4364 }
4365
4366 @Override
4367 public void visitReference(JCMemberReference that) {
4368 super.visitReference(that);
4369 if (that.sym == null) {
4370 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4371 }
4372 if (that.descriptorType == null) {
4373 that.descriptorType = syms.unknownType;
4374 }
4375 if (that.targets == null) {
4376 that.targets = List.nil();
4377 }
4378 }
4379 }
4380 // </editor-fold>
4381 }