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 Type polyPt = allowPoly ?
2155 syms.objectType :
2156 clazztype;
2157 if (!inferred.isErroneous() &&
2158 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings)) {
2159 String key = types.isSameType(clazztype, inferred) ?
2160 "diamond.redundant.args" :
2161 "diamond.redundant.args.1";
2162 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2163 }
2164 } finally {
2165 ta.arguments = prevTypeargs;
2166 }
2167 }
2168 }
2169
2170 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2171 if (allowLambda &&
2172 identifyLambdaCandidate &&
2173 clazztype.hasTag(CLASS) &&
2174 !pt().hasTag(NONE) &&
2175 types.isFunctionalInterface(clazztype.tsym)) {
2176 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2177 int count = 0;
2178 boolean found = false;
2179 for (Symbol sym : csym.members().getElements()) {
2180 if ((sym.flags() & SYNTHETIC) != 0 ||
2181 sym.isConstructor()) continue;
2182 count++;
2183 if (sym.kind != MTH ||
2184 !sym.name.equals(descriptor.name)) continue;
2185 Type mtype = types.memberType(clazztype, sym);
2186 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2187 found = true;
2188 }
2189 }
2190 if (found && count == 1) {
2191 log.note(tree.def, "potential.lambda.found");
2192 }
2193 }
2194 }
2195
2196 /** Make an attributed null check tree.
2197 */
2198 public JCExpression makeNullCheck(JCExpression arg) {
2199 // optimization: X.this is never null; skip null check
2200 Name name = TreeInfo.name(arg);
2201 if (name == names._this || name == names._super) return arg;
2202
2203 JCTree.Tag optag = NULLCHK;
2204 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2205 tree.operator = syms.nullcheck;
2206 tree.type = arg.type;
2207 return tree;
2208 }
2209
2210 public void visitNewArray(JCNewArray tree) {
2211 Type owntype = types.createErrorType(tree.type);
2212 Env<AttrContext> localEnv = env.dup(tree);
2213 Type elemtype;
2214 if (tree.elemtype != null) {
2215 elemtype = attribType(tree.elemtype, localEnv);
2216 chk.validate(tree.elemtype, localEnv);
2217 owntype = elemtype;
2218 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2219 attribExpr(l.head, localEnv, syms.intType);
2220 owntype = new ArrayType(owntype, syms.arrayClass);
2221 }
2222 } else {
2223 // we are seeing an untyped aggregate { ... }
2224 // this is allowed only if the prototype is an array
2225 if (pt().hasTag(ARRAY)) {
2226 elemtype = types.elemtype(pt());
2227 } else {
2228 if (!pt().hasTag(ERROR)) {
2229 log.error(tree.pos(), "illegal.initializer.for.type",
2230 pt());
2231 }
2232 elemtype = types.createErrorType(pt());
2233 }
2234 }
2235 if (tree.elems != null) {
2236 attribExprs(tree.elems, localEnv, elemtype);
2237 owntype = new ArrayType(elemtype, syms.arrayClass);
2238 }
2239 if (!types.isReifiable(elemtype))
2240 log.error(tree.pos(), "generic.array.creation");
2241 result = check(tree, owntype, VAL, resultInfo);
2242 }
2243
2244 /*
2245 * A lambda expression can only be attributed when a target-type is available.
2246 * In addition, if the target-type is that of a functional interface whose
2247 * descriptor contains inference variables in argument position the lambda expression
2248 * is 'stuck' (see DeferredAttr).
2249 */
2250 @Override
2251 public void visitLambda(final JCLambda that) {
2252 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2253 if (pt().hasTag(NONE)) {
2254 //lambda only allowed in assignment or method invocation/cast context
2255 log.error(that.pos(), "unexpected.lambda");
2256 }
2257 result = that.type = types.createErrorType(pt());
2258 return;
2259 }
2260 //create an environment for attribution of the lambda expression
2261 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2262 boolean needsRecovery =
2263 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2264 try {
2265 Type target = pt();
2266 List<Type> explicitParamTypes = null;
2267 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2268 //attribute lambda parameters
2269 attribStats(that.params, localEnv);
2270 explicitParamTypes = TreeInfo.types(that.params);
2271 target = infer.instantiateFunctionalInterface(that, target, explicitParamTypes, resultInfo.checkContext);
2272 }
2273
2274 Type lambdaType;
2275 if (pt() != Type.recoveryType) {
2276 target = checkIntersectionTarget(that, target, resultInfo.checkContext);
2277 lambdaType = types.findDescriptorType(target);
2278 chk.checkFunctionalInterface(that, target);
2279 } else {
2280 target = Type.recoveryType;
2281 lambdaType = fallbackDescriptorType(that);
2282 }
2283
2284 setFunctionalInfo(that, pt(), lambdaType, resultInfo.checkContext.inferenceContext());
2285
2286 if (lambdaType.hasTag(FORALL)) {
2287 //lambda expression target desc cannot be a generic method
2288 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2289 lambdaType, kindName(target.tsym), target.tsym));
2290 result = that.type = types.createErrorType(pt());
2291 return;
2292 }
2293
2294 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2295 //add param type info in the AST
2296 List<Type> actuals = lambdaType.getParameterTypes();
2297 List<JCVariableDecl> params = that.params;
2298
2299 boolean arityMismatch = false;
2300
2301 while (params.nonEmpty()) {
2302 if (actuals.isEmpty()) {
2303 //not enough actuals to perform lambda parameter inference
2304 arityMismatch = true;
2305 }
2306 //reset previously set info
2307 Type argType = arityMismatch ?
2308 syms.errType :
2309 actuals.head;
2310 params.head.vartype = make.Type(argType);
2311 params.head.sym = null;
2312 actuals = actuals.isEmpty() ?
2313 actuals :
2314 actuals.tail;
2315 params = params.tail;
2316 }
2317
2318 //attribute lambda parameters
2319 attribStats(that.params, localEnv);
2320
2321 if (arityMismatch) {
2322 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2323 result = that.type = types.createErrorType(target);
2324 return;
2325 }
2326 }
2327
2328 //from this point on, no recovery is needed; if we are in assignment context
2329 //we will be able to attribute the whole lambda body, regardless of errors;
2330 //if we are in a 'check' method context, and the lambda is not compatible
2331 //with the target-type, it will be recovered anyway in Attr.checkId
2332 needsRecovery = false;
2333
2334 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2335 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2336 new FunctionalReturnContext(resultInfo.checkContext);
2337
2338 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2339 recoveryInfo :
2340 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2341 localEnv.info.returnResult = bodyResultInfo;
2342
2343 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2344 attribTree(that.getBody(), localEnv, bodyResultInfo);
2345 } else {
2346 JCBlock body = (JCBlock)that.body;
2347 attribStats(body.stats, localEnv);
2348 }
2349
2350 result = check(that, target, VAL, resultInfo);
2351
2352 boolean isSpeculativeRound =
2353 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2354
2355 postAttr(that);
2356 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2357
2358 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2359
2360 if (!isSpeculativeRound) {
2361 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, target);
2362 }
2363 result = check(that, target, VAL, resultInfo);
2364 } catch (Types.FunctionDescriptorLookupError ex) {
2365 JCDiagnostic cause = ex.getDiagnostic();
2366 resultInfo.checkContext.report(that, cause);
2367 result = that.type = types.createErrorType(pt());
2368 return;
2369 } finally {
2370 localEnv.info.scope.leave();
2371 if (needsRecovery) {
2372 attribTree(that, env, recoveryInfo);
2373 }
2374 }
2375 }
2376
2377 private Type checkIntersectionTarget(DiagnosticPosition pos, Type pt, CheckContext checkContext) {
2378 if (pt != Type.recoveryType && pt.isCompound()) {
2379 IntersectionClassType ict = (IntersectionClassType)pt;
2380 List<Type> bounds = ict.allInterfaces ?
2381 ict.getComponents().tail :
2382 ict.getComponents();
2383 types.findDescriptorType(bounds.head); //propagate exception outwards!
2384 for (Type bound : bounds.tail) {
2385 if (!types.isMarkerInterface(bound)) {
2386 checkContext.report(pos, diags.fragment("secondary.bound.must.be.marker.intf", bound));
2387 }
2388 }
2389 //for now (translation doesn't support intersection types)
2390 return bounds.head;
2391 } else {
2392 return pt;
2393 }
2394 }
2395 //where
2396 private Type fallbackDescriptorType(JCExpression tree) {
2397 switch (tree.getTag()) {
2398 case LAMBDA:
2399 JCLambda lambda = (JCLambda)tree;
2400 List<Type> argtypes = List.nil();
2401 for (JCVariableDecl param : lambda.params) {
2402 argtypes = param.vartype != null ?
2403 argtypes.append(param.vartype.type) :
2404 argtypes.append(syms.errType);
2405 }
2406 return new MethodType(argtypes, Type.recoveryType, List.<Type>nil(), syms.methodClass);
2407 case REFERENCE:
2408 return new MethodType(List.<Type>nil(), Type.recoveryType, List.<Type>nil(), syms.methodClass);
2409 default:
2410 Assert.error("Cannot get here!");
2411 }
2412 return null;
2413 }
2414
2415 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, final InferenceContext inferenceContext, final Type... ts) {
2416 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2417 }
2418
2419 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env, final InferenceContext inferenceContext, final List<Type> ts) {
2420 if (inferenceContext.free(ts)) {
2421 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2422 @Override
2423 public void typesInferred(InferenceContext inferenceContext) {
2424 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2425 }
2426 });
2427 } else {
2428 for (Type t : ts) {
2429 rs.checkAccessibleType(env, t);
2430 }
2431 }
2432 }
2433
2434 /**
2435 * Lambda/method reference have a special check context that ensures
2436 * that i.e. a lambda return type is compatible with the expected
2437 * type according to both the inherited context and the assignment
2438 * context.
2439 */
2440 class FunctionalReturnContext extends Check.NestedCheckContext {
2441
2442 FunctionalReturnContext(CheckContext enclosingContext) {
2443 super(enclosingContext);
2444 }
2445
2446 @Override
2447 public boolean compatible(Type found, Type req, Warner warn) {
2448 //return type must be compatible in both current context and assignment context
2449 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2450 }
2451
2452 @Override
2453 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2454 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2455 }
2456 }
2457
2458 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2459
2460 JCExpression expr;
2461
2462 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2463 super(enclosingContext);
2464 this.expr = expr;
2465 }
2466
2467 @Override
2468 public boolean compatible(Type found, Type req, Warner warn) {
2469 //a void return is compatible with an expression statement lambda
2470 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2471 super.compatible(found, req, warn);
2472 }
2473 }
2474
2475 /**
2476 * Lambda compatibility. Check that given return types, thrown types, parameter types
2477 * are compatible with the expected functional interface descriptor. This means that:
2478 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2479 * types must be compatible with the return type of the expected descriptor;
2480 * (iii) thrown types must be 'included' in the thrown types list of the expected
2481 * descriptor.
2482 */
2483 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2484 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2485
2486 //return values have already been checked - but if lambda has no return
2487 //values, we must ensure that void/value compatibility is correct;
2488 //this amounts at checking that, if a lambda body can complete normally,
2489 //the descriptor's return type must be void
2490 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2491 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2492 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2493 diags.fragment("missing.ret.val", returnType)));
2494 }
2495
2496 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2497 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2498 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2499 }
2500
2501 if (!speculativeAttr) {
2502 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2503 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2504 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2505 }
2506 }
2507 }
2508
2509 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2510 Env<AttrContext> lambdaEnv;
2511 Symbol owner = env.info.scope.owner;
2512 if (owner.kind == VAR && owner.owner.kind == TYP) {
2513 //field initializer
2514 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2515 lambdaEnv.info.scope.owner =
2516 new MethodSymbol(0, names.empty, null,
2517 env.info.scope.owner);
2518 } else {
2519 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2520 }
2521 return lambdaEnv;
2522 }
2523
2524 @Override
2525 public void visitReference(final JCMemberReference that) {
2526 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2527 if (pt().hasTag(NONE)) {
2528 //method reference only allowed in assignment or method invocation/cast context
2529 log.error(that.pos(), "unexpected.mref");
2530 }
2531 result = that.type = types.createErrorType(pt());
2532 return;
2533 }
2534 final Env<AttrContext> localEnv = env.dup(that);
2535 try {
2536 //attribute member reference qualifier - if this is a constructor
2537 //reference, the expected kind must be a type
2538 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2539
2540 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2541 exprType = chk.checkConstructorRefType(that.expr, exprType);
2542 }
2543
2544 if (exprType.isErroneous()) {
2545 //if the qualifier expression contains problems,
2546 //give up attribution of method reference
2547 result = that.type = exprType;
2548 return;
2549 }
2550
2551 if (TreeInfo.isStaticSelector(that.expr, names) &&
2552 (that.getMode() != ReferenceMode.NEW || !that.expr.type.isRaw())) {
2553 //if the qualifier is a type, validate it
2554 chk.validate(that.expr, env);
2555 }
2556
2557 //attrib type-arguments
2558 List<Type> typeargtypes = List.nil();
2559 if (that.typeargs != null) {
2560 typeargtypes = attribTypes(that.typeargs, localEnv);
2561 }
2562
2563 Type target;
2564 Type desc;
2565 if (pt() != Type.recoveryType) {
2566 target = checkIntersectionTarget(that, pt(), resultInfo.checkContext);
2567 desc = types.findDescriptorType(target);
2568 chk.checkFunctionalInterface(that, target);
2569 } else {
2570 target = Type.recoveryType;
2571 desc = fallbackDescriptorType(that);
2572 }
2573
2574 setFunctionalInfo(that, pt(), desc, resultInfo.checkContext.inferenceContext());
2575 List<Type> argtypes = desc.getParameterTypes();
2576
2577 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = rs.resolveMemberReference(that.pos(), localEnv, that,
2578 that.expr.type, that.name, argtypes, typeargtypes, true);
2579
2580 Symbol refSym = refResult.fst;
2581 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2582
2583 if (refSym.kind != MTH) {
2584 boolean targetError;
2585 switch (refSym.kind) {
2586 case ABSENT_MTH:
2587 targetError = false;
2588 break;
2589 case WRONG_MTH:
2590 case WRONG_MTHS:
2591 case AMBIGUOUS:
2592 case HIDDEN:
2593 case STATICERR:
2594 case MISSING_ENCL:
2595 targetError = true;
2596 break;
2597 default:
2598 Assert.error("unexpected result kind " + refSym.kind);
2599 targetError = false;
2600 }
2601
2602 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2603 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2604
2605 JCDiagnostic.DiagnosticType diagKind = targetError ?
2606 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2607
2608 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2609 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2610
2611 if (targetError && target == Type.recoveryType) {
2612 //a target error doesn't make sense during recovery stage
2613 //as we don't know what actual parameter types are
2614 result = that.type = target;
2615 return;
2616 } else {
2617 if (targetError) {
2618 resultInfo.checkContext.report(that, diag);
2619 } else {
2620 log.report(diag);
2621 }
2622 result = that.type = types.createErrorType(target);
2623 return;
2624 }
2625 }
2626
2627 that.sym = refSym.baseSymbol();
2628 that.kind = lookupHelper.referenceKind(that.sym);
2629 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2630
2631 if (desc.getReturnType() == Type.recoveryType) {
2632 // stop here
2633 result = that.type = target;
2634 return;
2635 }
2636
2637 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2638
2639 if (!that.kind.isUnbound() &&
2640 that.getMode() == ReferenceMode.INVOKE &&
2641 TreeInfo.isStaticSelector(that.expr, names) &&
2642 !that.sym.isStatic()) {
2643 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2644 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2645 result = that.type = types.createErrorType(target);
2646 return;
2647 }
2648
2649 if (that.kind.isUnbound() &&
2650 that.getMode() == ReferenceMode.INVOKE &&
2651 TreeInfo.isStaticSelector(that.expr, names) &&
2652 that.sym.isStatic()) {
2653 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2654 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2655 result = that.type = types.createErrorType(target);
2656 return;
2657 }
2658
2659 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2660 exprType.getTypeArguments().nonEmpty()) {
2661 //static ref with class type-args
2662 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2663 diags.fragment("static.mref.with.targs"));
2664 result = that.type = types.createErrorType(target);
2665 return;
2666 }
2667
2668 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2669 !that.kind.isUnbound()) {
2670 //no static bound mrefs
2671 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2672 diags.fragment("static.bound.mref"));
2673 result = that.type = types.createErrorType(target);
2674 return;
2675 }
2676
2677 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2678 // Check that super-qualified symbols are not abstract (JLS)
2679 rs.checkNonAbstract(that.pos(), that.sym);
2680 }
2681 }
2682
2683 that.sym = refSym.baseSymbol();
2684 that.kind = lookupHelper.referenceKind(that.sym);
2685
2686 ResultInfo checkInfo =
2687 resultInfo.dup(newMethodTemplate(
2688 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2689 lookupHelper.argtypes,
2690 typeargtypes));
2691
2692 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2693
2694 if (!refType.isErroneous()) {
2695 refType = types.createMethodTypeWithReturn(refType,
2696 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2697 }
2698
2699 //go ahead with standard method reference compatibility check - note that param check
2700 //is a no-op (as this has been taken care during method applicability)
2701 boolean isSpeculativeRound =
2702 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2703 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2704 if (!isSpeculativeRound) {
2705 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2706 }
2707 result = check(that, target, VAL, resultInfo);
2708 } catch (Types.FunctionDescriptorLookupError ex) {
2709 JCDiagnostic cause = ex.getDiagnostic();
2710 resultInfo.checkContext.report(that, cause);
2711 result = that.type = types.createErrorType(pt());
2712 return;
2713 }
2714 }
2715 //where
2716 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2717 //if this is a constructor reference, the expected kind must be a type
2718 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2719 }
2720
2721
2722 @SuppressWarnings("fallthrough")
2723 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2724 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2725
2726 Type resType;
2727 switch (tree.getMode()) {
2728 case NEW:
2729 if (!tree.expr.type.isRaw()) {
2730 resType = tree.expr.type;
2731 break;
2732 }
2733 default:
2734 resType = refType.getReturnType();
2735 }
2736
2737 Type incompatibleReturnType = resType;
2738
2739 if (returnType.hasTag(VOID)) {
2740 incompatibleReturnType = null;
2741 }
2742
2743 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2744 if (resType.isErroneous() ||
2745 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2746 incompatibleReturnType = null;
2747 }
2748 }
2749
2750 if (incompatibleReturnType != null) {
2751 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2752 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2753 }
2754
2755 if (!speculativeAttr) {
2756 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2757 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2758 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2759 }
2760 }
2761 }
2762
2763 /**
2764 * Set functional type info on the underlying AST. Note: as the target descriptor
2765 * might contain inference variables, we might need to register an hook in the
2766 * current inference context.
2767 */
2768 private void setFunctionalInfo(final JCFunctionalExpression fExpr, final Type pt, final Type descriptorType, InferenceContext inferenceContext) {
2769 if (inferenceContext.free(descriptorType)) {
2770 inferenceContext.addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2771 public void typesInferred(InferenceContext inferenceContext) {
2772 setFunctionalInfo(fExpr, pt, inferenceContext.asInstType(descriptorType), inferenceContext);
2773 }
2774 });
2775 } else {
2776 ListBuffer<TypeSymbol> targets = ListBuffer.lb();
2777 if (pt.hasTag(CLASS)) {
2778 if (pt.isCompound()) {
2779 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2780 targets.append(t.tsym);
2781 }
2782 } else {
2783 targets.append(pt.tsym);
2784 }
2785 }
2786 fExpr.targets = targets.toList();
2787 fExpr.descriptorType = descriptorType;
2788 }
2789 }
2790
2791 public void visitParens(JCParens tree) {
2792 Type owntype = attribTree(tree.expr, env, resultInfo);
2793 result = check(tree, owntype, pkind(), resultInfo);
2794 Symbol sym = TreeInfo.symbol(tree);
2795 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2796 log.error(tree.pos(), "illegal.start.of.type");
2797 }
2798
2799 public void visitAssign(JCAssign tree) {
2800 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2801 Type capturedType = capture(owntype);
2802 attribExpr(tree.rhs, env, owntype);
2803 result = check(tree, capturedType, VAL, resultInfo);
2804 }
2805
2806 public void visitAssignop(JCAssignOp tree) {
2807 // Attribute arguments.
2808 Type owntype = attribTree(tree.lhs, env, varInfo);
2809 Type operand = attribExpr(tree.rhs, env);
2810 // Find operator.
2811 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2812 tree.pos(), tree.getTag().noAssignOp(), env,
2813 owntype, operand);
2814
2815 if (operator.kind == MTH &&
2816 !owntype.isErroneous() &&
2817 !operand.isErroneous()) {
2818 chk.checkOperator(tree.pos(),
2819 (OperatorSymbol)operator,
2820 tree.getTag().noAssignOp(),
2821 owntype,
2822 operand);
2823 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2824 chk.checkCastable(tree.rhs.pos(),
2825 operator.type.getReturnType(),
2826 owntype);
2827 }
2828 result = check(tree, owntype, VAL, resultInfo);
2829 }
2830
2831 public void visitUnary(JCUnary tree) {
2832 // Attribute arguments.
2833 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2834 ? attribTree(tree.arg, env, varInfo)
2835 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2836
2837 // Find operator.
2838 Symbol operator = tree.operator =
2839 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2840
2841 Type owntype = types.createErrorType(tree.type);
2842 if (operator.kind == MTH &&
2843 !argtype.isErroneous()) {
2844 owntype = (tree.getTag().isIncOrDecUnaryOp())
2845 ? tree.arg.type
2846 : operator.type.getReturnType();
2847 int opc = ((OperatorSymbol)operator).opcode;
2848
2849 // If the argument is constant, fold it.
2850 if (argtype.constValue() != null) {
2851 Type ctype = cfolder.fold1(opc, argtype);
2852 if (ctype != null) {
2853 owntype = cfolder.coerce(ctype, owntype);
2854
2855 // Remove constant types from arguments to
2856 // conserve space. The parser will fold concatenations
2857 // of string literals; the code here also
2858 // gets rid of intermediate results when some of the
2859 // operands are constant identifiers.
2860 if (tree.arg.type.tsym == syms.stringType.tsym) {
2861 tree.arg.type = syms.stringType;
2862 }
2863 }
2864 }
2865 }
2866 result = check(tree, owntype, VAL, resultInfo);
2867 }
2868
2869 public void visitBinary(JCBinary tree) {
2870 // Attribute arguments.
2871 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
2872 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
2873
2874 // Find operator.
2875 Symbol operator = tree.operator =
2876 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
2877
2878 Type owntype = types.createErrorType(tree.type);
2879 if (operator.kind == MTH &&
2880 !left.isErroneous() &&
2881 !right.isErroneous()) {
2882 owntype = operator.type.getReturnType();
2883 int opc = chk.checkOperator(tree.lhs.pos(),
2884 (OperatorSymbol)operator,
2885 tree.getTag(),
2886 left,
2887 right);
2888
2889 // If both arguments are constants, fold them.
2890 if (left.constValue() != null && right.constValue() != null) {
2891 Type ctype = cfolder.fold2(opc, left, right);
2892 if (ctype != null) {
2893 owntype = cfolder.coerce(ctype, owntype);
2894
2895 // Remove constant types from arguments to
2896 // conserve space. The parser will fold concatenations
2897 // of string literals; the code here also
2898 // gets rid of intermediate results when some of the
2899 // operands are constant identifiers.
2900 if (tree.lhs.type.tsym == syms.stringType.tsym) {
2901 tree.lhs.type = syms.stringType;
2902 }
2903 if (tree.rhs.type.tsym == syms.stringType.tsym) {
2904 tree.rhs.type = syms.stringType;
2905 }
2906 }
2907 }
2908
2909 // Check that argument types of a reference ==, != are
2910 // castable to each other, (JLS???).
2911 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
2912 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
2913 log.error(tree.pos(), "incomparable.types", left, right);
2914 }
2915 }
2916
2917 chk.checkDivZero(tree.rhs.pos(), operator, right);
2918 }
2919 result = check(tree, owntype, VAL, resultInfo);
2920 }
2921
2922 public void visitTypeCast(final JCTypeCast tree) {
2923 Type clazztype = attribType(tree.clazz, env);
2924 chk.validate(tree.clazz, env, false);
2925 //a fresh environment is required for 292 inference to work properly ---
2926 //see Infer.instantiatePolymorphicSignatureInstance()
2927 Env<AttrContext> localEnv = env.dup(tree);
2928 //should we propagate the target type?
2929 final ResultInfo castInfo;
2930 final boolean isPoly = TreeInfo.isPoly(tree.expr, tree);
2931 if (isPoly) {
2932 //expression is a poly - we need to propagate target type info
2933 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
2934 @Override
2935 public boolean compatible(Type found, Type req, Warner warn) {
2936 return types.isCastable(found, req, warn);
2937 }
2938 });
2939 } else {
2940 //standalone cast - target-type info is not propagated
2941 castInfo = unknownExprInfo;
2942 }
2943 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
2944 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2945 if (exprtype.constValue() != null)
2946 owntype = cfolder.coerce(exprtype, owntype);
2947 result = check(tree, capture(owntype), VAL, resultInfo);
2948 if (!isPoly)
2949 chk.checkRedundantCast(localEnv, tree);
2950 }
2951
2952 public void visitTypeTest(JCInstanceOf tree) {
2953 Type exprtype = chk.checkNullOrRefType(
2954 tree.expr.pos(), attribExpr(tree.expr, env));
2955 Type clazztype = chk.checkReifiableReferenceType(
2956 tree.clazz.pos(), attribType(tree.clazz, env));
2957 chk.validate(tree.clazz, env, false);
2958 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2959 result = check(tree, syms.booleanType, VAL, resultInfo);
2960 }
2961
2962 public void visitIndexed(JCArrayAccess tree) {
2963 Type owntype = types.createErrorType(tree.type);
2964 Type atype = attribExpr(tree.indexed, env);
2965 attribExpr(tree.index, env, syms.intType);
2966 if (types.isArray(atype))
2967 owntype = types.elemtype(atype);
2968 else if (!atype.hasTag(ERROR))
2969 log.error(tree.pos(), "array.req.but.found", atype);
2970 if ((pkind() & VAR) == 0) owntype = capture(owntype);
2971 result = check(tree, owntype, VAR, resultInfo);
2972 }
2973
2974 public void visitIdent(JCIdent tree) {
2975 Symbol sym;
2976
2977 // Find symbol
2978 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
2979 // If we are looking for a method, the prototype `pt' will be a
2980 // method type with the type of the call's arguments as parameters.
2981 env.info.pendingResolutionPhase = null;
2982 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
2983 } else if (tree.sym != null && tree.sym.kind != VAR) {
2984 sym = tree.sym;
2985 } else {
2986 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
2987 }
2988 tree.sym = sym;
2989
2990 // (1) Also find the environment current for the class where
2991 // sym is defined (`symEnv').
2992 // Only for pre-tiger versions (1.4 and earlier):
2993 // (2) Also determine whether we access symbol out of an anonymous
2994 // class in a this or super call. This is illegal for instance
2995 // members since such classes don't carry a this$n link.
2996 // (`noOuterThisPath').
2997 Env<AttrContext> symEnv = env;
2998 boolean noOuterThisPath = false;
2999 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3000 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3001 sym.owner.kind == TYP &&
3002 tree.name != names._this && tree.name != names._super) {
3003
3004 // Find environment in which identifier is defined.
3005 while (symEnv.outer != null &&
3006 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3007 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3008 noOuterThisPath = !allowAnonOuterThis;
3009 symEnv = symEnv.outer;
3010 }
3011 }
3012
3013 // If symbol is a variable, ...
3014 if (sym.kind == VAR) {
3015 VarSymbol v = (VarSymbol)sym;
3016
3017 // ..., evaluate its initializer, if it has one, and check for
3018 // illegal forward reference.
3019 checkInit(tree, env, v, false);
3020
3021 // If we are expecting a variable (as opposed to a value), check
3022 // that the variable is assignable in the current environment.
3023 if (pkind() == VAR)
3024 checkAssignable(tree.pos(), v, null, env);
3025 }
3026
3027 // In a constructor body,
3028 // if symbol is a field or instance method, check that it is
3029 // not accessed before the supertype constructor is called.
3030 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3031 (sym.kind & (VAR | MTH)) != 0 &&
3032 sym.owner.kind == TYP &&
3033 (sym.flags() & STATIC) == 0) {
3034 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3035 }
3036 Env<AttrContext> env1 = env;
3037 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3038 // If the found symbol is inaccessible, then it is
3039 // accessed through an enclosing instance. Locate this
3040 // enclosing instance:
3041 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3042 env1 = env1.outer;
3043 }
3044 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3045 }
3046
3047 public void visitSelect(JCFieldAccess tree) {
3048 // Determine the expected kind of the qualifier expression.
3049 int skind = 0;
3050 if (tree.name == names._this || tree.name == names._super ||
3051 tree.name == names._class)
3052 {
3053 skind = TYP;
3054 } else {
3055 if ((pkind() & PCK) != 0) skind = skind | PCK;
3056 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3057 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3058 }
3059
3060 // Attribute the qualifier expression, and determine its symbol (if any).
3061 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3062 if ((pkind() & (PCK | TYP)) == 0)
3063 site = capture(site); // Capture field access
3064
3065 // don't allow T.class T[].class, etc
3066 if (skind == TYP) {
3067 Type elt = site;
3068 while (elt.hasTag(ARRAY))
3069 elt = ((ArrayType)elt).elemtype;
3070 if (elt.hasTag(TYPEVAR)) {
3071 log.error(tree.pos(), "type.var.cant.be.deref");
3072 result = types.createErrorType(tree.type);
3073 return;
3074 }
3075 }
3076
3077 // If qualifier symbol is a type or `super', assert `selectSuper'
3078 // for the selection. This is relevant for determining whether
3079 // protected symbols are accessible.
3080 Symbol sitesym = TreeInfo.symbol(tree.selected);
3081 boolean selectSuperPrev = env.info.selectSuper;
3082 env.info.selectSuper =
3083 sitesym != null &&
3084 sitesym.name == names._super;
3085
3086 // Determine the symbol represented by the selection.
3087 env.info.pendingResolutionPhase = null;
3088 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3089 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3090 site = capture(site);
3091 sym = selectSym(tree, sitesym, site, env, resultInfo);
3092 }
3093 boolean varArgs = env.info.lastResolveVarargs();
3094 tree.sym = sym;
3095
3096 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3097 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3098 site = capture(site);
3099 }
3100
3101 // If that symbol is a variable, ...
3102 if (sym.kind == VAR) {
3103 VarSymbol v = (VarSymbol)sym;
3104
3105 // ..., evaluate its initializer, if it has one, and check for
3106 // illegal forward reference.
3107 checkInit(tree, env, v, true);
3108
3109 // If we are expecting a variable (as opposed to a value), check
3110 // that the variable is assignable in the current environment.
3111 if (pkind() == VAR)
3112 checkAssignable(tree.pos(), v, tree.selected, env);
3113 }
3114
3115 if (sitesym != null &&
3116 sitesym.kind == VAR &&
3117 ((VarSymbol)sitesym).isResourceVariable() &&
3118 sym.kind == MTH &&
3119 sym.name.equals(names.close) &&
3120 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3121 env.info.lint.isEnabled(LintCategory.TRY)) {
3122 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3123 }
3124
3125 // Disallow selecting a type from an expression
3126 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3127 tree.type = check(tree.selected, pt(),
3128 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3129 }
3130
3131 if (isType(sitesym)) {
3132 if (sym.name == names._this) {
3133 // If `C' is the currently compiled class, check that
3134 // C.this' does not appear in a call to a super(...)
3135 if (env.info.isSelfCall &&
3136 site.tsym == env.enclClass.sym) {
3137 chk.earlyRefError(tree.pos(), sym);
3138 }
3139 } else {
3140 // Check if type-qualified fields or methods are static (JLS)
3141 if ((sym.flags() & STATIC) == 0 &&
3142 !env.next.tree.hasTag(REFERENCE) &&
3143 sym.name != names._super &&
3144 (sym.kind == VAR || sym.kind == MTH)) {
3145 rs.accessBase(rs.new StaticError(sym),
3146 tree.pos(), site, sym.name, true);
3147 }
3148 }
3149 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3150 // If the qualified item is not a type and the selected item is static, report
3151 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3152 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3153 }
3154
3155 // If we are selecting an instance member via a `super', ...
3156 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3157
3158 // Check that super-qualified symbols are not abstract (JLS)
3159 rs.checkNonAbstract(tree.pos(), sym);
3160
3161 if (site.isRaw()) {
3162 // Determine argument types for site.
3163 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3164 if (site1 != null) site = site1;
3165 }
3166 }
3167
3168 env.info.selectSuper = selectSuperPrev;
3169 result = checkId(tree, site, sym, env, resultInfo);
3170 }
3171 //where
3172 /** Determine symbol referenced by a Select expression,
3173 *
3174 * @param tree The select tree.
3175 * @param site The type of the selected expression,
3176 * @param env The current environment.
3177 * @param resultInfo The current result.
3178 */
3179 private Symbol selectSym(JCFieldAccess tree,
3180 Symbol location,
3181 Type site,
3182 Env<AttrContext> env,
3183 ResultInfo resultInfo) {
3184 DiagnosticPosition pos = tree.pos();
3185 Name name = tree.name;
3186 switch (site.getTag()) {
3187 case PACKAGE:
3188 return rs.accessBase(
3189 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3190 pos, location, site, name, true);
3191 case ARRAY:
3192 case CLASS:
3193 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3194 return rs.resolveQualifiedMethod(
3195 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3196 } else if (name == names._this || name == names._super) {
3197 return rs.resolveSelf(pos, env, site.tsym, name);
3198 } else if (name == names._class) {
3199 // In this case, we have already made sure in
3200 // visitSelect that qualifier expression is a type.
3201 Type t = syms.classType;
3202 List<Type> typeargs = allowGenerics
3203 ? List.of(types.erasure(site))
3204 : List.<Type>nil();
3205 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3206 return new VarSymbol(
3207 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3208 } else {
3209 // We are seeing a plain identifier as selector.
3210 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3211 if ((resultInfo.pkind & ERRONEOUS) == 0)
3212 sym = rs.accessBase(sym, pos, location, site, name, true);
3213 return sym;
3214 }
3215 case WILDCARD:
3216 throw new AssertionError(tree);
3217 case TYPEVAR:
3218 // Normally, site.getUpperBound() shouldn't be null.
3219 // It should only happen during memberEnter/attribBase
3220 // when determining the super type which *must* beac
3221 // done before attributing the type variables. In
3222 // other words, we are seeing this illegal program:
3223 // class B<T> extends A<T.foo> {}
3224 Symbol sym = (site.getUpperBound() != null)
3225 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3226 : null;
3227 if (sym == null) {
3228 log.error(pos, "type.var.cant.be.deref");
3229 return syms.errSymbol;
3230 } else {
3231 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3232 rs.new AccessError(env, site, sym) :
3233 sym;
3234 rs.accessBase(sym2, pos, location, site, name, true);
3235 return sym;
3236 }
3237 case ERROR:
3238 // preserve identifier names through errors
3239 return types.createErrorType(name, site.tsym, site).tsym;
3240 default:
3241 // The qualifier expression is of a primitive type -- only
3242 // .class is allowed for these.
3243 if (name == names._class) {
3244 // In this case, we have already made sure in Select that
3245 // qualifier expression is a type.
3246 Type t = syms.classType;
3247 Type arg = types.boxedClass(site).type;
3248 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3249 return new VarSymbol(
3250 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3251 } else {
3252 log.error(pos, "cant.deref", site);
3253 return syms.errSymbol;
3254 }
3255 }
3256 }
3257
3258 /** Determine type of identifier or select expression and check that
3259 * (1) the referenced symbol is not deprecated
3260 * (2) the symbol's type is safe (@see checkSafe)
3261 * (3) if symbol is a variable, check that its type and kind are
3262 * compatible with the prototype and protokind.
3263 * (4) if symbol is an instance field of a raw type,
3264 * which is being assigned to, issue an unchecked warning if its
3265 * type changes under erasure.
3266 * (5) if symbol is an instance method of a raw type, issue an
3267 * unchecked warning if its argument types change under erasure.
3268 * If checks succeed:
3269 * If symbol is a constant, return its constant type
3270 * else if symbol is a method, return its result type
3271 * otherwise return its type.
3272 * Otherwise return errType.
3273 *
3274 * @param tree The syntax tree representing the identifier
3275 * @param site If this is a select, the type of the selected
3276 * expression, otherwise the type of the current class.
3277 * @param sym The symbol representing the identifier.
3278 * @param env The current environment.
3279 * @param resultInfo The expected result
3280 */
3281 Type checkId(JCTree tree,
3282 Type site,
3283 Symbol sym,
3284 Env<AttrContext> env,
3285 ResultInfo resultInfo) {
3286 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3287 checkMethodId(tree, site, sym, env, resultInfo) :
3288 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3289 }
3290
3291 Type checkMethodId(JCTree tree,
3292 Type site,
3293 Symbol sym,
3294 Env<AttrContext> env,
3295 ResultInfo resultInfo) {
3296 boolean isPolymorhicSignature =
3297 sym.kind == MTH && ((MethodSymbol)sym.baseSymbol()).isSignaturePolymorphic(types);
3298 return isPolymorhicSignature ?
3299 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3300 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3301 }
3302
3303 Type checkSigPolyMethodId(JCTree tree,
3304 Type site,
3305 Symbol sym,
3306 Env<AttrContext> env,
3307 ResultInfo resultInfo) {
3308 //recover original symbol for signature polymorphic methods
3309 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3310 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3311 return sym.type;
3312 }
3313
3314 Type checkMethodIdInternal(JCTree tree,
3315 Type site,
3316 Symbol sym,
3317 Env<AttrContext> env,
3318 ResultInfo resultInfo) {
3319 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3320 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3321 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3322 return owntype;
3323 }
3324
3325 Type checkIdInternal(JCTree tree,
3326 Type site,
3327 Symbol sym,
3328 Type pt,
3329 Env<AttrContext> env,
3330 ResultInfo resultInfo) {
3331 if (pt.isErroneous()) {
3332 return types.createErrorType(site);
3333 }
3334 Type owntype; // The computed type of this identifier occurrence.
3335 switch (sym.kind) {
3336 case TYP:
3337 // For types, the computed type equals the symbol's type,
3338 // except for two situations:
3339 owntype = sym.type;
3340 if (owntype.hasTag(CLASS)) {
3341 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3342 Type ownOuter = owntype.getEnclosingType();
3343
3344 // (a) If the symbol's type is parameterized, erase it
3345 // because no type parameters were given.
3346 // We recover generic outer type later in visitTypeApply.
3347 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3348 owntype = types.erasure(owntype);
3349 }
3350
3351 // (b) If the symbol's type is an inner class, then
3352 // we have to interpret its outer type as a superclass
3353 // of the site type. Example:
3354 //
3355 // class Tree<A> { class Visitor { ... } }
3356 // class PointTree extends Tree<Point> { ... }
3357 // ...PointTree.Visitor...
3358 //
3359 // Then the type of the last expression above is
3360 // Tree<Point>.Visitor.
3361 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3362 Type normOuter = site;
3363 if (normOuter.hasTag(CLASS)) {
3364 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3365 if (site.getKind() == TypeKind.ANNOTATED) {
3366 // Propagate any type annotations.
3367 // TODO: should asEnclosingSuper do this?
3368 // Note that the type annotations in site will be updated
3369 // by annotateType. Therefore, modify site instead
3370 // of creating a new AnnotatedType.
3371 ((AnnotatedType)site).underlyingType = normOuter;
3372 normOuter = site;
3373 }
3374 }
3375 if (normOuter == null) // perhaps from an import
3376 normOuter = types.erasure(ownOuter);
3377 if (normOuter != ownOuter)
3378 owntype = new ClassType(
3379 normOuter, List.<Type>nil(), owntype.tsym);
3380 }
3381 }
3382 break;
3383 case VAR:
3384 VarSymbol v = (VarSymbol)sym;
3385 // Test (4): if symbol is an instance field of a raw type,
3386 // which is being assigned to, issue an unchecked warning if
3387 // its type changes under erasure.
3388 if (allowGenerics &&
3389 resultInfo.pkind == VAR &&
3390 v.owner.kind == TYP &&
3391 (v.flags() & STATIC) == 0 &&
3392 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3393 Type s = types.asOuterSuper(site, v.owner);
3394 if (s != null &&
3395 s.isRaw() &&
3396 !types.isSameType(v.type, v.erasure(types))) {
3397 chk.warnUnchecked(tree.pos(),
3398 "unchecked.assign.to.var",
3399 v, s);
3400 }
3401 }
3402 // The computed type of a variable is the type of the
3403 // variable symbol, taken as a member of the site type.
3404 owntype = (sym.owner.kind == TYP &&
3405 sym.name != names._this && sym.name != names._super)
3406 ? types.memberType(site, sym)
3407 : sym.type;
3408
3409 // If the variable is a constant, record constant value in
3410 // computed type.
3411 if (v.getConstValue() != null && isStaticReference(tree))
3412 owntype = owntype.constType(v.getConstValue());
3413
3414 if (resultInfo.pkind == VAL) {
3415 owntype = capture(owntype); // capture "names as expressions"
3416 }
3417 break;
3418 case MTH: {
3419 owntype = checkMethod(site, sym,
3420 new ResultInfo(VAL, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3421 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3422 resultInfo.pt.getTypeArguments());
3423 break;
3424 }
3425 case PCK: case ERR:
3426 owntype = sym.type;
3427 break;
3428 default:
3429 throw new AssertionError("unexpected kind: " + sym.kind +
3430 " in tree " + tree);
3431 }
3432
3433 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3434 // (for constructors, the error was given when the constructor was
3435 // resolved)
3436
3437 if (sym.name != names.init) {
3438 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3439 chk.checkSunAPI(tree.pos(), sym);
3440 chk.checkProfile(tree.pos(), sym);
3441 }
3442
3443 // Test (3): if symbol is a variable, check that its type and
3444 // kind are compatible with the prototype and protokind.
3445 return check(tree, owntype, sym.kind, resultInfo);
3446 }
3447
3448 /** Check that variable is initialized and evaluate the variable's
3449 * initializer, if not yet done. Also check that variable is not
3450 * referenced before it is defined.
3451 * @param tree The tree making up the variable reference.
3452 * @param env The current environment.
3453 * @param v The variable's symbol.
3454 */
3455 private void checkInit(JCTree tree,
3456 Env<AttrContext> env,
3457 VarSymbol v,
3458 boolean onlyWarning) {
3459 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3460 // tree.pos + " " + v.pos + " " +
3461 // Resolve.isStatic(env));//DEBUG
3462
3463 // A forward reference is diagnosed if the declaration position
3464 // of the variable is greater than the current tree position
3465 // and the tree and variable definition occur in the same class
3466 // definition. Note that writes don't count as references.
3467 // This check applies only to class and instance
3468 // variables. Local variables follow different scope rules,
3469 // and are subject to definite assignment checking.
3470 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3471 v.owner.kind == TYP &&
3472 canOwnInitializer(owner(env)) &&
3473 v.owner == env.info.scope.owner.enclClass() &&
3474 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3475 (!env.tree.hasTag(ASSIGN) ||
3476 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3477 String suffix = (env.info.enclVar == v) ?
3478 "self.ref" : "forward.ref";
3479 if (!onlyWarning || isStaticEnumField(v)) {
3480 log.error(tree.pos(), "illegal." + suffix);
3481 } else if (useBeforeDeclarationWarning) {
3482 log.warning(tree.pos(), suffix, v);
3483 }
3484 }
3485
3486 v.getConstValue(); // ensure initializer is evaluated
3487
3488 checkEnumInitializer(tree, env, v);
3489 }
3490
3491 /**
3492 * Check for illegal references to static members of enum. In
3493 * an enum type, constructors and initializers may not
3494 * reference its static members unless they are constant.
3495 *
3496 * @param tree The tree making up the variable reference.
3497 * @param env The current environment.
3498 * @param v The variable's symbol.
3499 * @jls section 8.9 Enums
3500 */
3501 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3502 // JLS:
3503 //
3504 // "It is a compile-time error to reference a static field
3505 // of an enum type that is not a compile-time constant
3506 // (15.28) from constructors, instance initializer blocks,
3507 // or instance variable initializer expressions of that
3508 // type. It is a compile-time error for the constructors,
3509 // instance initializer blocks, or instance variable
3510 // initializer expressions of an enum constant e to refer
3511 // to itself or to an enum constant of the same type that
3512 // is declared to the right of e."
3513 if (isStaticEnumField(v)) {
3514 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3515
3516 if (enclClass == null || enclClass.owner == null)
3517 return;
3518
3519 // See if the enclosing class is the enum (or a
3520 // subclass thereof) declaring v. If not, this
3521 // reference is OK.
3522 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3523 return;
3524
3525 // If the reference isn't from an initializer, then
3526 // the reference is OK.
3527 if (!Resolve.isInitializer(env))
3528 return;
3529
3530 log.error(tree.pos(), "illegal.enum.static.ref");
3531 }
3532 }
3533
3534 /** Is the given symbol a static, non-constant field of an Enum?
3535 * Note: enum literals should not be regarded as such
3536 */
3537 private boolean isStaticEnumField(VarSymbol v) {
3538 return Flags.isEnum(v.owner) &&
3539 Flags.isStatic(v) &&
3540 !Flags.isConstant(v) &&
3541 v.name != names._class;
3542 }
3543
3544 /** Can the given symbol be the owner of code which forms part
3545 * if class initialization? This is the case if the symbol is
3546 * a type or field, or if the symbol is the synthetic method.
3547 * owning a block.
3548 */
3549 private boolean canOwnInitializer(Symbol sym) {
3550 return
3551 (sym.kind & (VAR | TYP)) != 0 ||
3552 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3553 }
3554
3555 Warner noteWarner = new Warner();
3556
3557 /**
3558 * Check that method arguments conform to its instantiation.
3559 **/
3560 public Type checkMethod(Type site,
3561 Symbol sym,
3562 ResultInfo resultInfo,
3563 Env<AttrContext> env,
3564 final List<JCExpression> argtrees,
3565 List<Type> argtypes,
3566 List<Type> typeargtypes) {
3567 // Test (5): if symbol is an instance method of a raw type, issue
3568 // an unchecked warning if its argument types change under erasure.
3569 if (allowGenerics &&
3570 (sym.flags() & STATIC) == 0 &&
3571 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3572 Type s = types.asOuterSuper(site, sym.owner);
3573 if (s != null && s.isRaw() &&
3574 !types.isSameTypes(sym.type.getParameterTypes(),
3575 sym.erasure(types).getParameterTypes())) {
3576 chk.warnUnchecked(env.tree.pos(),
3577 "unchecked.call.mbr.of.raw.type",
3578 sym, s);
3579 }
3580 }
3581
3582 if (env.info.defaultSuperCallSite != null) {
3583 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3584 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3585 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3586 List<MethodSymbol> icand_sup =
3587 types.interfaceCandidates(sup, (MethodSymbol)sym);
3588 if (icand_sup.nonEmpty() &&
3589 icand_sup.head != sym &&
3590 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3591 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3592 diags.fragment("overridden.default", sym, sup));
3593 break;
3594 }
3595 }
3596 env.info.defaultSuperCallSite = null;
3597 }
3598
3599 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3600 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3601 if (app.meth.hasTag(SELECT) &&
3602 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3603 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3604 }
3605 }
3606
3607 // Compute the identifier's instantiated type.
3608 // For methods, we need to compute the instance type by
3609 // Resolve.instantiate from the symbol's type as well as
3610 // any type arguments and value arguments.
3611 noteWarner.clear();
3612 try {
3613 Type owntype = rs.checkMethod(
3614 env,
3615 site,
3616 sym,
3617 resultInfo,
3618 argtypes,
3619 typeargtypes,
3620 noteWarner);
3621
3622 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3623 noteWarner.hasNonSilentLint(LintCategory.UNCHECKED));
3624 } catch (Infer.InferenceException ex) {
3625 //invalid target type - propagate exception outwards or report error
3626 //depending on the current check context
3627 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3628 return types.createErrorType(site);
3629 } catch (Resolve.InapplicableMethodException ex) {
3630 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3631 return null;
3632 }
3633 }
3634
3635 public void visitLiteral(JCLiteral tree) {
3636 result = check(
3637 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3638 }
3639 //where
3640 /** Return the type of a literal with given type tag.
3641 */
3642 Type litType(TypeTag tag) {
3643 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3644 }
3645
3646 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3647 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3648 }
3649
3650 public void visitTypeArray(JCArrayTypeTree tree) {
3651 Type etype = attribType(tree.elemtype, env);
3652 Type type = new ArrayType(etype, syms.arrayClass);
3653 result = check(tree, type, TYP, resultInfo);
3654 }
3655
3656 /** Visitor method for parameterized types.
3657 * Bound checking is left until later, since types are attributed
3658 * before supertype structure is completely known
3659 */
3660 public void visitTypeApply(JCTypeApply tree) {
3661 Type owntype = types.createErrorType(tree.type);
3662
3663 // Attribute functor part of application and make sure it's a class.
3664 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3665
3666 // Attribute type parameters
3667 List<Type> actuals = attribTypes(tree.arguments, env);
3668
3669 if (clazztype.hasTag(CLASS)) {
3670 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3671 if (actuals.isEmpty()) //diamond
3672 actuals = formals;
3673
3674 if (actuals.length() == formals.length()) {
3675 List<Type> a = actuals;
3676 List<Type> f = formals;
3677 while (a.nonEmpty()) {
3678 a.head = a.head.withTypeVar(f.head);
3679 a = a.tail;
3680 f = f.tail;
3681 }
3682 // Compute the proper generic outer
3683 Type clazzOuter = clazztype.getEnclosingType();
3684 if (clazzOuter.hasTag(CLASS)) {
3685 Type site;
3686 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3687 if (clazz.hasTag(IDENT)) {
3688 site = env.enclClass.sym.type;
3689 } else if (clazz.hasTag(SELECT)) {
3690 site = ((JCFieldAccess) clazz).selected.type;
3691 } else throw new AssertionError(""+tree);
3692 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3693 if (site.hasTag(CLASS))
3694 site = types.asOuterSuper(site, clazzOuter.tsym);
3695 if (site == null)
3696 site = types.erasure(clazzOuter);
3697 clazzOuter = site;
3698 }
3699 }
3700 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3701 } else {
3702 if (formals.length() != 0) {
3703 log.error(tree.pos(), "wrong.number.type.args",
3704 Integer.toString(formals.length()));
3705 } else {
3706 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3707 }
3708 owntype = types.createErrorType(tree.type);
3709 }
3710 }
3711 result = check(tree, owntype, TYP, resultInfo);
3712 }
3713
3714 public void visitTypeUnion(JCTypeUnion tree) {
3715 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3716 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3717 for (JCExpression typeTree : tree.alternatives) {
3718 Type ctype = attribType(typeTree, env);
3719 ctype = chk.checkType(typeTree.pos(),
3720 chk.checkClassType(typeTree.pos(), ctype),
3721 syms.throwableType);
3722 if (!ctype.isErroneous()) {
3723 //check that alternatives of a union type are pairwise
3724 //unrelated w.r.t. subtyping
3725 if (chk.intersects(ctype, multicatchTypes.toList())) {
3726 for (Type t : multicatchTypes) {
3727 boolean sub = types.isSubtype(ctype, t);
3728 boolean sup = types.isSubtype(t, ctype);
3729 if (sub || sup) {
3730 //assume 'a' <: 'b'
3731 Type a = sub ? ctype : t;
3732 Type b = sub ? t : ctype;
3733 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3734 }
3735 }
3736 }
3737 multicatchTypes.append(ctype);
3738 if (all_multicatchTypes != null)
3739 all_multicatchTypes.append(ctype);
3740 } else {
3741 if (all_multicatchTypes == null) {
3742 all_multicatchTypes = ListBuffer.lb();
3743 all_multicatchTypes.appendList(multicatchTypes);
3744 }
3745 all_multicatchTypes.append(ctype);
3746 }
3747 }
3748 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3749 if (t.hasTag(CLASS)) {
3750 List<Type> alternatives =
3751 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3752 t = new UnionClassType((ClassType) t, alternatives);
3753 }
3754 tree.type = result = t;
3755 }
3756
3757 public void visitTypeIntersection(JCTypeIntersection tree) {
3758 attribTypes(tree.bounds, env);
3759 tree.type = result = checkIntersection(tree, tree.bounds);
3760 }
3761
3762 public void visitTypeParameter(JCTypeParameter tree) {
3763 TypeVar typeVar = (TypeVar) tree.type;
3764
3765 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3766 AnnotatedType antype = new AnnotatedType(typeVar);
3767 annotateType(antype, tree.annotations);
3768 tree.type = antype;
3769 }
3770
3771 if (!typeVar.bound.isErroneous()) {
3772 //fixup type-parameter bound computed in 'attribTypeVariables'
3773 typeVar.bound = checkIntersection(tree, tree.bounds);
3774 }
3775 }
3776
3777 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3778 Set<Type> boundSet = new HashSet<Type>();
3779 if (bounds.nonEmpty()) {
3780 // accept class or interface or typevar as first bound.
3781 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3782 boundSet.add(types.erasure(bounds.head.type));
3783 if (bounds.head.type.isErroneous()) {
3784 return bounds.head.type;
3785 }
3786 else if (bounds.head.type.hasTag(TYPEVAR)) {
3787 // if first bound was a typevar, do not accept further bounds.
3788 if (bounds.tail.nonEmpty()) {
3789 log.error(bounds.tail.head.pos(),
3790 "type.var.may.not.be.followed.by.other.bounds");
3791 return bounds.head.type;
3792 }
3793 } else {
3794 // if first bound was a class or interface, accept only interfaces
3795 // as further bounds.
3796 for (JCExpression bound : bounds.tail) {
3797 bound.type = checkBase(bound.type, bound, env, false, true, false);
3798 if (bound.type.isErroneous()) {
3799 bounds = List.of(bound);
3800 }
3801 else if (bound.type.hasTag(CLASS)) {
3802 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3803 }
3804 }
3805 }
3806 }
3807
3808 if (bounds.length() == 0) {
3809 return syms.objectType;
3810 } else if (bounds.length() == 1) {
3811 return bounds.head.type;
3812 } else {
3813 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3814 if (tree.hasTag(TYPEINTERSECTION)) {
3815 ((IntersectionClassType)owntype).intersectionKind =
3816 IntersectionClassType.IntersectionKind.EXPLICIT;
3817 }
3818 // ... the variable's bound is a class type flagged COMPOUND
3819 // (see comment for TypeVar.bound).
3820 // In this case, generate a class tree that represents the
3821 // bound class, ...
3822 JCExpression extending;
3823 List<JCExpression> implementing;
3824 if (!bounds.head.type.isInterface()) {
3825 extending = bounds.head;
3826 implementing = bounds.tail;
3827 } else {
3828 extending = null;
3829 implementing = bounds;
3830 }
3831 JCClassDecl cd = make.at(tree).ClassDef(
3832 make.Modifiers(PUBLIC | ABSTRACT),
3833 names.empty, List.<JCTypeParameter>nil(),
3834 extending, implementing, List.<JCTree>nil());
3835
3836 ClassSymbol c = (ClassSymbol)owntype.tsym;
3837 Assert.check((c.flags() & COMPOUND) != 0);
3838 cd.sym = c;
3839 c.sourcefile = env.toplevel.sourcefile;
3840
3841 // ... and attribute the bound class
3842 c.flags_field |= UNATTRIBUTED;
3843 Env<AttrContext> cenv = enter.classEnv(cd, env);
3844 enter.typeEnvs.put(c, cenv);
3845 attribClass(c);
3846 return owntype;
3847 }
3848 }
3849
3850 public void visitWildcard(JCWildcard tree) {
3851 //- System.err.println("visitWildcard("+tree+");");//DEBUG
3852 Type type = (tree.kind.kind == BoundKind.UNBOUND)
3853 ? syms.objectType
3854 : attribType(tree.inner, env);
3855 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
3856 tree.kind.kind,
3857 syms.boundClass),
3858 TYP, resultInfo);
3859 }
3860
3861 public void visitAnnotation(JCAnnotation tree) {
3862 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
3863 result = tree.type = syms.errType;
3864 }
3865
3866 public void visitAnnotatedType(JCAnnotatedType tree) {
3867 Type underlyingType = attribType(tree.getUnderlyingType(), env);
3868 this.attribAnnotationTypes(tree.annotations, env);
3869 AnnotatedType antype = new AnnotatedType(underlyingType);
3870 annotateType(antype, tree.annotations);
3871 result = tree.type = antype;
3872 }
3873
3874 /**
3875 * Apply the annotations to the particular type.
3876 */
3877 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
3878 if (annotations.isEmpty())
3879 return;
3880 annotate.typeAnnotation(new Annotate.Annotator() {
3881 @Override
3882 public String toString() {
3883 return "annotate " + annotations + " onto " + type;
3884 }
3885 @Override
3886 public void enterAnnotation() {
3887 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
3888 type.typeAnnotations = compounds;
3889 }
3890 });
3891 }
3892
3893 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
3894 if (annotations.isEmpty())
3895 return List.nil();
3896
3897 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
3898 for (JCAnnotation anno : annotations) {
3899 buf.append((Attribute.TypeCompound) anno.attribute);
3900 }
3901 return buf.toList();
3902 }
3903
3904 public void visitErroneous(JCErroneous tree) {
3905 if (tree.errs != null)
3906 for (JCTree err : tree.errs)
3907 attribTree(err, env, new ResultInfo(ERR, pt()));
3908 result = tree.type = syms.errType;
3909 }
3910
3911 /** Default visitor method for all other trees.
3912 */
3913 public void visitTree(JCTree tree) {
3914 throw new AssertionError();
3915 }
3916
3917 /**
3918 * Attribute an env for either a top level tree or class declaration.
3919 */
3920 public void attrib(Env<AttrContext> env) {
3921 if (env.tree.hasTag(TOPLEVEL))
3922 attribTopLevel(env);
3923 else
3924 attribClass(env.tree.pos(), env.enclClass.sym);
3925 }
3926
3927 /**
3928 * Attribute a top level tree. These trees are encountered when the
3929 * package declaration has annotations.
3930 */
3931 public void attribTopLevel(Env<AttrContext> env) {
3932 JCCompilationUnit toplevel = env.toplevel;
3933 try {
3934 annotate.flush();
3935 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
3936 } catch (CompletionFailure ex) {
3937 chk.completionError(toplevel.pos(), ex);
3938 }
3939 }
3940
3941 /** Main method: attribute class definition associated with given class symbol.
3942 * reporting completion failures at the given position.
3943 * @param pos The source position at which completion errors are to be
3944 * reported.
3945 * @param c The class symbol whose definition will be attributed.
3946 */
3947 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
3948 try {
3949 annotate.flush();
3950 attribClass(c);
3951 } catch (CompletionFailure ex) {
3952 chk.completionError(pos, ex);
3953 }
3954 }
3955
3956 /** Attribute class definition associated with given class symbol.
3957 * @param c The class symbol whose definition will be attributed.
3958 */
3959 void attribClass(ClassSymbol c) throws CompletionFailure {
3960 if (c.type.hasTag(ERROR)) return;
3961
3962 // Check for cycles in the inheritance graph, which can arise from
3963 // ill-formed class files.
3964 chk.checkNonCyclic(null, c.type);
3965
3966 Type st = types.supertype(c.type);
3967 if ((c.flags_field & Flags.COMPOUND) == 0) {
3968 // First, attribute superclass.
3969 if (st.hasTag(CLASS))
3970 attribClass((ClassSymbol)st.tsym);
3971
3972 // Next attribute owner, if it is a class.
3973 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
3974 attribClass((ClassSymbol)c.owner);
3975 }
3976
3977 // The previous operations might have attributed the current class
3978 // if there was a cycle. So we test first whether the class is still
3979 // UNATTRIBUTED.
3980 if ((c.flags_field & UNATTRIBUTED) != 0) {
3981 c.flags_field &= ~UNATTRIBUTED;
3982
3983 // Get environment current at the point of class definition.
3984 Env<AttrContext> env = enter.typeEnvs.get(c);
3985
3986 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
3987 // because the annotations were not available at the time the env was created. Therefore,
3988 // we look up the environment chain for the first enclosing environment for which the
3989 // lint value is set. Typically, this is the parent env, but might be further if there
3990 // are any envs created as a result of TypeParameter nodes.
3991 Env<AttrContext> lintEnv = env;
3992 while (lintEnv.info.lint == null)
3993 lintEnv = lintEnv.next;
3994
3995 // Having found the enclosing lint value, we can initialize the lint value for this class
3996 env.info.lint = lintEnv.info.lint.augment(c.annotations, c.flags());
3997
3998 Lint prevLint = chk.setLint(env.info.lint);
3999 JavaFileObject prev = log.useSource(c.sourcefile);
4000 ResultInfo prevReturnRes = env.info.returnResult;
4001
4002 try {
4003 env.info.returnResult = null;
4004 // java.lang.Enum may not be subclassed by a non-enum
4005 if (st.tsym == syms.enumSym &&
4006 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4007 log.error(env.tree.pos(), "enum.no.subclassing");
4008
4009 // Enums may not be extended by source-level classes
4010 if (st.tsym != null &&
4011 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4012 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4013 log.error(env.tree.pos(), "enum.types.not.extensible");
4014 }
4015 attribClassBody(env, c);
4016
4017 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4018 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4019 } finally {
4020 env.info.returnResult = prevReturnRes;
4021 log.useSource(prev);
4022 chk.setLint(prevLint);
4023 }
4024
4025 }
4026 }
4027
4028 public void visitImport(JCImport tree) {
4029 // nothing to do
4030 }
4031
4032 /** Finish the attribution of a class. */
4033 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4034 JCClassDecl tree = (JCClassDecl)env.tree;
4035 Assert.check(c == tree.sym);
4036
4037 // Validate annotations
4038 chk.validateAnnotations(tree.mods.annotations, c);
4039
4040 // Validate type parameters, supertype and interfaces.
4041 attribStats(tree.typarams, env);
4042 if (!c.isAnonymous()) {
4043 //already checked if anonymous
4044 chk.validate(tree.typarams, env);
4045 chk.validate(tree.extending, env);
4046 chk.validate(tree.implementing, env);
4047 }
4048
4049 // If this is a non-abstract class, check that it has no abstract
4050 // methods or unimplemented methods of an implemented interface.
4051 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4052 if (!relax)
4053 chk.checkAllDefined(tree.pos(), c);
4054 }
4055
4056 if ((c.flags() & ANNOTATION) != 0) {
4057 if (tree.implementing.nonEmpty())
4058 log.error(tree.implementing.head.pos(),
4059 "cant.extend.intf.annotation");
4060 if (tree.typarams.nonEmpty())
4061 log.error(tree.typarams.head.pos(),
4062 "intf.annotation.cant.have.type.params");
4063
4064 // If this annotation has a @Repeatable, validate
4065 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4066 if (repeatable != null) {
4067 // get diagnostic position for error reporting
4068 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4069 Assert.checkNonNull(cbPos);
4070
4071 chk.validateRepeatable(c, repeatable, cbPos);
4072 }
4073 } else {
4074 // Check that all extended classes and interfaces
4075 // are compatible (i.e. no two define methods with same arguments
4076 // yet different return types). (JLS 8.4.6.3)
4077 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4078 if (allowDefaultMethods) {
4079 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4080 }
4081 }
4082
4083 // Check that class does not import the same parameterized interface
4084 // with two different argument lists.
4085 chk.checkClassBounds(tree.pos(), c.type);
4086
4087 tree.type = c.type;
4088
4089 for (List<JCTypeParameter> l = tree.typarams;
4090 l.nonEmpty(); l = l.tail) {
4091 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4092 }
4093
4094 // Check that a generic class doesn't extend Throwable
4095 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4096 log.error(tree.extending.pos(), "generic.throwable");
4097
4098 // Check that all methods which implement some
4099 // method conform to the method they implement.
4100 chk.checkImplementations(tree);
4101
4102 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4103 checkAutoCloseable(tree.pos(), env, c.type);
4104
4105 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4106 // Attribute declaration
4107 attribStat(l.head, env);
4108 // Check that declarations in inner classes are not static (JLS 8.1.2)
4109 // Make an exception for static constants.
4110 if (c.owner.kind != PCK &&
4111 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4112 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4113 Symbol sym = null;
4114 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4115 if (sym == null ||
4116 sym.kind != VAR ||
4117 ((VarSymbol) sym).getConstValue() == null)
4118 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4119 }
4120 }
4121
4122 // Check for cycles among non-initial constructors.
4123 chk.checkCyclicConstructors(tree);
4124
4125 // Check for cycles among annotation elements.
4126 chk.checkNonCyclicElements(tree);
4127
4128 // Check for proper use of serialVersionUID
4129 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4130 isSerializable(c) &&
4131 (c.flags() & Flags.ENUM) == 0 &&
4132 (c.flags() & ABSTRACT) == 0) {
4133 checkSerialVersionUID(tree, c);
4134 }
4135
4136 // Correctly organize the postions of the type annotations
4137 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4138
4139 // Check type annotations applicability rules
4140 validateTypeAnnotations(tree);
4141 }
4142 // where
4143 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4144 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4145 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4146 if (types.isSameType(al.head.annotationType.type, t))
4147 return al.head.pos();
4148 }
4149
4150 return null;
4151 }
4152
4153 /** check if a class is a subtype of Serializable, if that is available. */
4154 private boolean isSerializable(ClassSymbol c) {
4155 try {
4156 syms.serializableType.complete();
4157 }
4158 catch (CompletionFailure e) {
4159 return false;
4160 }
4161 return types.isSubtype(c.type, syms.serializableType);
4162 }
4163
4164 /** Check that an appropriate serialVersionUID member is defined. */
4165 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4166
4167 // check for presence of serialVersionUID
4168 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4169 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4170 if (e.scope == null) {
4171 log.warning(LintCategory.SERIAL,
4172 tree.pos(), "missing.SVUID", c);
4173 return;
4174 }
4175
4176 // check that it is static final
4177 VarSymbol svuid = (VarSymbol)e.sym;
4178 if ((svuid.flags() & (STATIC | FINAL)) !=
4179 (STATIC | FINAL))
4180 log.warning(LintCategory.SERIAL,
4181 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4182
4183 // check that it is long
4184 else if (!svuid.type.hasTag(LONG))
4185 log.warning(LintCategory.SERIAL,
4186 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4187
4188 // check constant
4189 else if (svuid.getConstValue() == null)
4190 log.warning(LintCategory.SERIAL,
4191 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4192 }
4193
4194 private Type capture(Type type) {
4195 //do not capture free types
4196 return resultInfo.checkContext.inferenceContext().free(type) ?
4197 type : types.capture(type);
4198 }
4199
4200 private void validateTypeAnnotations(JCTree tree) {
4201 tree.accept(typeAnnotationsValidator);
4202 }
4203 //where
4204 private final JCTree.Visitor typeAnnotationsValidator =
4205 new TreeScanner() {
4206 public void visitAnnotation(JCAnnotation tree) {
4207 if (tree.hasTag(TYPE_ANNOTATION)) {
4208 // TODO: It seems to WMD as if the annotation in
4209 // parameters, in particular also the recvparam, are never
4210 // of type JCTypeAnnotation and therefore never checked!
4211 // Luckily this check doesn't really do anything that isn't
4212 // also done elsewhere.
4213 chk.validateTypeAnnotation(tree, false);
4214 }
4215 super.visitAnnotation(tree);
4216 }
4217 public void visitTypeParameter(JCTypeParameter tree) {
4218 chk.validateTypeAnnotations(tree.annotations, true);
4219 scan(tree.bounds);
4220 // Don't call super.
4221 // This is needed because above we call validateTypeAnnotation with
4222 // false, which would forbid annotations on type parameters.
4223 // super.visitTypeParameter(tree);
4224 }
4225 public void visitMethodDef(JCMethodDecl tree) {
4226 // Static methods cannot have receiver type annotations.
4227 // In test case FailOver15.java, the nested method getString has
4228 // a null sym, because an unknown class is instantiated.
4229 // I would say it's safe to skip.
4230 if (tree.sym != null && (tree.sym.flags() & Flags.STATIC) != 0) {
4231 if (tree.recvparam != null) {
4232 // TODO: better error message. Is the pos good?
4233 log.error(tree.recvparam.pos(), "annotation.type.not.applicable");
4234 }
4235 }
4236 if (tree.restype != null && tree.restype.type != null) {
4237 validateAnnotatedType(tree.restype, tree.restype.type);
4238 }
4239 super.visitMethodDef(tree);
4240 }
4241 public void visitVarDef(final JCVariableDecl tree) {
4242 if (tree.sym != null && tree.sym.type != null)
4243 validateAnnotatedType(tree, tree.sym.type);
4244 super.visitVarDef(tree);
4245 }
4246 public void visitTypeCast(JCTypeCast tree) {
4247 if (tree.clazz != null && tree.clazz.type != null)
4248 validateAnnotatedType(tree.clazz, tree.clazz.type);
4249 super.visitTypeCast(tree);
4250 }
4251 public void visitTypeTest(JCInstanceOf tree) {
4252 if (tree.clazz != null && tree.clazz.type != null)
4253 validateAnnotatedType(tree.clazz, tree.clazz.type);
4254 super.visitTypeTest(tree);
4255 }
4256 // TODO: what else do we need?
4257 // public void visitNewClass(JCNewClass tree) {
4258 // public void visitNewArray(JCNewArray tree) {
4259
4260 /* I would want to model this after
4261 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4262 * and override visitSelect and visitTypeApply.
4263 * However, we only set the annotated type in the top-level type
4264 * of the symbol.
4265 * Therefore, we need to override each individual location where a type
4266 * can occur.
4267 */
4268 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4269 if (type.getEnclosingType() != null &&
4270 type != type.getEnclosingType()) {
4271 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4272 }
4273 for (Type targ : type.getTypeArguments()) {
4274 validateAnnotatedType(errtree, targ);
4275 }
4276 }
4277 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4278 validateAnnotatedType(errtree, type);
4279 if (type.tsym != null &&
4280 type.tsym.isStatic() &&
4281 type.getAnnotations().nonEmpty()) {
4282 // Enclosing static classes cannot have type annotations.
4283 log.error(errtree.pos(), "cant.annotate.static.class");
4284 }
4285 }
4286 };
4287
4288 // <editor-fold desc="post-attribution visitor">
4289
4290 /**
4291 * Handle missing types/symbols in an AST. This routine is useful when
4292 * the compiler has encountered some errors (which might have ended up
4293 * terminating attribution abruptly); if the compiler is used in fail-over
4294 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4295 * prevents NPE to be progagated during subsequent compilation steps.
4296 */
4297 public void postAttr(JCTree tree) {
4298 new PostAttrAnalyzer().scan(tree);
4299 }
4300
4301 class PostAttrAnalyzer extends TreeScanner {
4302
4303 private void initTypeIfNeeded(JCTree that) {
4304 if (that.type == null) {
4305 that.type = syms.unknownType;
4306 }
4307 }
4308
4309 @Override
4310 public void scan(JCTree tree) {
4311 if (tree == null) return;
4312 if (tree instanceof JCExpression) {
4313 initTypeIfNeeded(tree);
4314 }
4315 super.scan(tree);
4316 }
4317
4318 @Override
4319 public void visitIdent(JCIdent that) {
4320 if (that.sym == null) {
4321 that.sym = syms.unknownSymbol;
4322 }
4323 }
4324
4325 @Override
4326 public void visitSelect(JCFieldAccess that) {
4327 if (that.sym == null) {
4328 that.sym = syms.unknownSymbol;
4329 }
4330 super.visitSelect(that);
4331 }
4332
4333 @Override
4334 public void visitClassDef(JCClassDecl that) {
4335 initTypeIfNeeded(that);
4336 if (that.sym == null) {
4337 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4338 }
4339 super.visitClassDef(that);
4340 }
4341
4342 @Override
4343 public void visitMethodDef(JCMethodDecl that) {
4344 initTypeIfNeeded(that);
4345 if (that.sym == null) {
4346 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4347 }
4348 super.visitMethodDef(that);
4349 }
4350
4351 @Override
4352 public void visitVarDef(JCVariableDecl that) {
4353 initTypeIfNeeded(that);
4354 if (that.sym == null) {
4355 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4356 that.sym.adr = 0;
4357 }
4358 super.visitVarDef(that);
4359 }
4360
4361 @Override
4362 public void visitNewClass(JCNewClass that) {
4363 if (that.constructor == null) {
4364 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4365 }
4366 if (that.constructorType == null) {
4367 that.constructorType = syms.unknownType;
4368 }
4369 super.visitNewClass(that);
4370 }
4371
4372 @Override
4373 public void visitAssignop(JCAssignOp that) {
4374 if (that.operator == null)
4375 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4376 super.visitAssignop(that);
4377 }
4378
4379 @Override
4380 public void visitBinary(JCBinary that) {
4381 if (that.operator == null)
4382 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4383 super.visitBinary(that);
4384 }
4385
4386 @Override
4387 public void visitUnary(JCUnary that) {
4388 if (that.operator == null)
4389 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4390 super.visitUnary(that);
4391 }
4392
4393 @Override
4394 public void visitLambda(JCLambda that) {
4395 super.visitLambda(that);
4396 if (that.descriptorType == null) {
4397 that.descriptorType = syms.unknownType;
4398 }
4399 if (that.targets == null) {
4400 that.targets = List.nil();
4401 }
4402 }
4403
4404 @Override
4405 public void visitReference(JCMemberReference that) {
4406 super.visitReference(that);
4407 if (that.sym == null) {
4408 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4409 }
4410 if (that.descriptorType == null) {
4411 that.descriptorType = syms.unknownType;
4412 }
4413 if (that.targets == null) {
4414 that.targets = List.nil();
4415 }
4416 }
4417 }
4418 // </editor-fold>
4419 }