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src/share/classes/com/sun/tools/javac/comp/Attr.java@e42c27026290
src/share/classes/com/sun/tools/javac/comp/Attr.java
Thu, 27 Jun 2013 16:04:05 +0100
- author
- vromero
- date
- Thu, 27 Jun 2013 16:04:05 +0100
- changeset 1864
- e42c27026290
- parent 1851
- e9ebff1840e5
- child 1869
- 5c548a8542b8
- permissions
- -rw-r--r--
8016099: Some @SuppressWarnings annotations ignored ( unchecked, rawtypes )
Reviewed-by: jjg
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 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
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.*;
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>();
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;
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 }
105 protected Attr(Context context) {
106 context.put(attrKey, this);
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);
126 Options options = Options.instance(context);
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 allowTypeAnnos = source.allowTypeAnnotations();
138 allowLambda = source.allowLambda();
139 allowDefaultMethods = source.allowDefaultMethods();
140 sourceName = source.name;
141 relax = (options.isSet("-retrofit") ||
142 options.isSet("-relax"));
143 findDiamonds = options.get("findDiamond") != null &&
144 source.allowDiamond();
145 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
146 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
148 statInfo = new ResultInfo(NIL, Type.noType);
149 varInfo = new ResultInfo(VAR, Type.noType);
150 unknownExprInfo = new ResultInfo(VAL, Type.noType);
151 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
152 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
153 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
154 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
155 }
157 /** Switch: relax some constraints for retrofit mode.
158 */
159 boolean relax;
161 /** Switch: support target-typing inference
162 */
163 boolean allowPoly;
165 /** Switch: support type annotations.
166 */
167 boolean allowTypeAnnos;
169 /** Switch: support generics?
170 */
171 boolean allowGenerics;
173 /** Switch: allow variable-arity methods.
174 */
175 boolean allowVarargs;
177 /** Switch: support enums?
178 */
179 boolean allowEnums;
181 /** Switch: support boxing and unboxing?
182 */
183 boolean allowBoxing;
185 /** Switch: support covariant result types?
186 */
187 boolean allowCovariantReturns;
189 /** Switch: support lambda expressions ?
190 */
191 boolean allowLambda;
193 /** Switch: support default methods ?
194 */
195 boolean allowDefaultMethods;
197 /** Switch: allow references to surrounding object from anonymous
198 * objects during constructor call?
199 */
200 boolean allowAnonOuterThis;
202 /** Switch: generates a warning if diamond can be safely applied
203 * to a given new expression
204 */
205 boolean findDiamonds;
207 /**
208 * Internally enables/disables diamond finder feature
209 */
210 static final boolean allowDiamondFinder = true;
212 /**
213 * Switch: warn about use of variable before declaration?
214 * RFE: 6425594
215 */
216 boolean useBeforeDeclarationWarning;
218 /**
219 * Switch: generate warnings whenever an anonymous inner class that is convertible
220 * to a lambda expression is found
221 */
222 boolean identifyLambdaCandidate;
224 /**
225 * Switch: allow strings in switch?
226 */
227 boolean allowStringsInSwitch;
229 /**
230 * Switch: name of source level; used for error reporting.
231 */
232 String sourceName;
234 /** Check kind and type of given tree against protokind and prototype.
235 * If check succeeds, store type in tree and return it.
236 * If check fails, store errType in tree and return it.
237 * No checks are performed if the prototype is a method type.
238 * It is not necessary in this case since we know that kind and type
239 * are correct.
240 *
241 * @param tree The tree whose kind and type is checked
242 * @param ownkind The computed kind of the tree
243 * @param resultInfo The expected result of the tree
244 */
245 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
246 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
247 Type owntype = found;
248 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
249 if (allowPoly && inferenceContext.free(found)) {
250 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
251 @Override
252 public void typesInferred(InferenceContext inferenceContext) {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 }
257 });
258 return tree.type = resultInfo.pt;
259 } else {
260 if ((ownkind & ~resultInfo.pkind) == 0) {
261 owntype = resultInfo.check(tree, owntype);
262 } else {
263 log.error(tree.pos(), "unexpected.type",
264 kindNames(resultInfo.pkind),
265 kindName(ownkind));
266 owntype = types.createErrorType(owntype);
267 }
268 }
269 }
270 tree.type = owntype;
271 return owntype;
272 }
274 /** Is given blank final variable assignable, i.e. in a scope where it
275 * may be assigned to even though it is final?
276 * @param v The blank final variable.
277 * @param env The current environment.
278 */
279 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
280 Symbol owner = owner(env);
281 // owner refers to the innermost variable, method or
282 // initializer block declaration at this point.
283 return
284 v.owner == owner
285 ||
286 ((owner.name == names.init || // i.e. we are in a constructor
287 owner.kind == VAR || // i.e. we are in a variable initializer
288 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
289 &&
290 v.owner == owner.owner
291 &&
292 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
293 }
295 /**
296 * Return the innermost enclosing owner symbol in a given attribution context
297 */
298 Symbol owner(Env<AttrContext> env) {
299 while (true) {
300 switch (env.tree.getTag()) {
301 case VARDEF:
302 //a field can be owner
303 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
304 if (vsym.owner.kind == TYP) {
305 return vsym;
306 }
307 break;
308 case METHODDEF:
309 //method def is always an owner
310 return ((JCMethodDecl)env.tree).sym;
311 case CLASSDEF:
312 //class def is always an owner
313 return ((JCClassDecl)env.tree).sym;
314 case LAMBDA:
315 //a lambda is an owner - return a fresh synthetic method symbol
316 return new MethodSymbol(0, names.empty, null, syms.methodClass);
317 case BLOCK:
318 //static/instance init blocks are owner
319 Symbol blockSym = env.info.scope.owner;
320 if ((blockSym.flags() & BLOCK) != 0) {
321 return blockSym;
322 }
323 break;
324 case TOPLEVEL:
325 //toplevel is always an owner (for pkge decls)
326 return env.info.scope.owner;
327 }
328 Assert.checkNonNull(env.next);
329 env = env.next;
330 }
331 }
333 /** Check that variable can be assigned to.
334 * @param pos The current source code position.
335 * @param v The assigned varaible
336 * @param base If the variable is referred to in a Select, the part
337 * to the left of the `.', null otherwise.
338 * @param env The current environment.
339 */
340 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
341 if ((v.flags() & FINAL) != 0 &&
342 ((v.flags() & HASINIT) != 0
343 ||
344 !((base == null ||
345 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
346 isAssignableAsBlankFinal(v, env)))) {
347 if (v.isResourceVariable()) { //TWR resource
348 log.error(pos, "try.resource.may.not.be.assigned", v);
349 } else {
350 log.error(pos, "cant.assign.val.to.final.var", v);
351 }
352 }
353 }
355 /** Does tree represent a static reference to an identifier?
356 * It is assumed that tree is either a SELECT or an IDENT.
357 * We have to weed out selects from non-type names here.
358 * @param tree The candidate tree.
359 */
360 boolean isStaticReference(JCTree tree) {
361 if (tree.hasTag(SELECT)) {
362 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
363 if (lsym == null || lsym.kind != TYP) {
364 return false;
365 }
366 }
367 return true;
368 }
370 /** Is this symbol a type?
371 */
372 static boolean isType(Symbol sym) {
373 return sym != null && sym.kind == TYP;
374 }
376 /** The current `this' symbol.
377 * @param env The current environment.
378 */
379 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
380 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
381 }
383 /** Attribute a parsed identifier.
384 * @param tree Parsed identifier name
385 * @param topLevel The toplevel to use
386 */
387 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
388 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
389 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
390 syms.errSymbol.name,
391 null, null, null, null);
392 localEnv.enclClass.sym = syms.errSymbol;
393 return tree.accept(identAttributer, localEnv);
394 }
395 // where
396 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
397 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
398 @Override
399 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
400 Symbol site = visit(node.getExpression(), env);
401 if (site.kind == ERR)
402 return site;
403 Name name = (Name)node.getIdentifier();
404 if (site.kind == PCK) {
405 env.toplevel.packge = (PackageSymbol)site;
406 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
407 } else {
408 env.enclClass.sym = (ClassSymbol)site;
409 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
410 }
411 }
413 @Override
414 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
415 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
416 }
417 }
419 public Type coerce(Type etype, Type ttype) {
420 return cfolder.coerce(etype, ttype);
421 }
423 public Type attribType(JCTree node, TypeSymbol sym) {
424 Env<AttrContext> env = enter.typeEnvs.get(sym);
425 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
426 return attribTree(node, localEnv, unknownTypeInfo);
427 }
429 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
430 // Attribute qualifying package or class.
431 JCFieldAccess s = (JCFieldAccess)tree.qualid;
432 return attribTree(s.selected,
433 env,
434 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
435 Type.noType));
436 }
438 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
439 breakTree = tree;
440 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
441 try {
442 attribExpr(expr, env);
443 } catch (BreakAttr b) {
444 return b.env;
445 } catch (AssertionError ae) {
446 if (ae.getCause() instanceof BreakAttr) {
447 return ((BreakAttr)(ae.getCause())).env;
448 } else {
449 throw ae;
450 }
451 } finally {
452 breakTree = null;
453 log.useSource(prev);
454 }
455 return env;
456 }
458 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
459 breakTree = tree;
460 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
461 try {
462 attribStat(stmt, env);
463 } catch (BreakAttr b) {
464 return b.env;
465 } catch (AssertionError ae) {
466 if (ae.getCause() instanceof BreakAttr) {
467 return ((BreakAttr)(ae.getCause())).env;
468 } else {
469 throw ae;
470 }
471 } finally {
472 breakTree = null;
473 log.useSource(prev);
474 }
475 return env;
476 }
478 private JCTree breakTree = null;
480 private static class BreakAttr extends RuntimeException {
481 static final long serialVersionUID = -6924771130405446405L;
482 private Env<AttrContext> env;
483 private BreakAttr(Env<AttrContext> env) {
484 this.env = copyEnv(env);
485 }
487 private Env<AttrContext> copyEnv(Env<AttrContext> env) {
488 Env<AttrContext> newEnv =
489 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
490 if (newEnv.outer != null) {
491 newEnv.outer = copyEnv(newEnv.outer);
492 }
493 return newEnv;
494 }
496 private Scope copyScope(Scope sc) {
497 Scope newScope = new Scope(sc.owner);
498 List<Symbol> elemsList = List.nil();
499 while (sc != null) {
500 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
501 elemsList = elemsList.prepend(e.sym);
502 }
503 sc = sc.next;
504 }
505 for (Symbol s : elemsList) {
506 newScope.enter(s);
507 }
508 return newScope;
509 }
510 }
512 class ResultInfo {
513 final int pkind;
514 final Type pt;
515 final CheckContext checkContext;
517 ResultInfo(int pkind, Type pt) {
518 this(pkind, pt, chk.basicHandler);
519 }
521 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
522 this.pkind = pkind;
523 this.pt = pt;
524 this.checkContext = checkContext;
525 }
527 protected Type check(final DiagnosticPosition pos, final Type found) {
528 return chk.checkType(pos, found, pt, checkContext);
529 }
531 protected ResultInfo dup(Type newPt) {
532 return new ResultInfo(pkind, newPt, checkContext);
533 }
535 protected ResultInfo dup(CheckContext newContext) {
536 return new ResultInfo(pkind, pt, newContext);
537 }
538 }
540 class RecoveryInfo extends ResultInfo {
542 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
543 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
544 @Override
545 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
546 return deferredAttrContext;
547 }
548 @Override
549 public boolean compatible(Type found, Type req, Warner warn) {
550 return true;
551 }
552 @Override
553 public void report(DiagnosticPosition pos, JCDiagnostic details) {
554 chk.basicHandler.report(pos, details);
555 }
556 });
557 }
559 @Override
560 protected Type check(DiagnosticPosition pos, Type found) {
561 return chk.checkNonVoid(pos, super.check(pos, found));
562 }
563 }
565 final ResultInfo statInfo;
566 final ResultInfo varInfo;
567 final ResultInfo unknownAnyPolyInfo;
568 final ResultInfo unknownExprInfo;
569 final ResultInfo unknownTypeInfo;
570 final ResultInfo unknownTypeExprInfo;
571 final ResultInfo recoveryInfo;
573 Type pt() {
574 return resultInfo.pt;
575 }
577 int pkind() {
578 return resultInfo.pkind;
579 }
581 /* ************************************************************************
582 * Visitor methods
583 *************************************************************************/
585 /** Visitor argument: the current environment.
586 */
587 Env<AttrContext> env;
589 /** Visitor argument: the currently expected attribution result.
590 */
591 ResultInfo resultInfo;
593 /** Visitor result: the computed type.
594 */
595 Type result;
597 /** Visitor method: attribute a tree, catching any completion failure
598 * exceptions. Return the tree's type.
599 *
600 * @param tree The tree to be visited.
601 * @param env The environment visitor argument.
602 * @param resultInfo The result info visitor argument.
603 */
604 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
605 Env<AttrContext> prevEnv = this.env;
606 ResultInfo prevResult = this.resultInfo;
607 try {
608 this.env = env;
609 this.resultInfo = resultInfo;
610 tree.accept(this);
611 if (tree == breakTree &&
612 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
613 throw new BreakAttr(env);
614 }
615 return result;
616 } catch (CompletionFailure ex) {
617 tree.type = syms.errType;
618 return chk.completionError(tree.pos(), ex);
619 } finally {
620 this.env = prevEnv;
621 this.resultInfo = prevResult;
622 }
623 }
625 /** Derived visitor method: attribute an expression tree.
626 */
627 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
628 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
629 }
631 /** Derived visitor method: attribute an expression tree with
632 * no constraints on the computed type.
633 */
634 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
635 return attribTree(tree, env, unknownExprInfo);
636 }
638 /** Derived visitor method: attribute a type tree.
639 */
640 public Type attribType(JCTree tree, Env<AttrContext> env) {
641 Type result = attribType(tree, env, Type.noType);
642 return result;
643 }
645 /** Derived visitor method: attribute a type tree.
646 */
647 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
648 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
649 return result;
650 }
652 /** Derived visitor method: attribute a statement or definition tree.
653 */
654 public Type attribStat(JCTree tree, Env<AttrContext> env) {
655 return attribTree(tree, env, statInfo);
656 }
658 /** Attribute a list of expressions, returning a list of types.
659 */
660 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
661 ListBuffer<Type> ts = new ListBuffer<Type>();
662 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
663 ts.append(attribExpr(l.head, env, pt));
664 return ts.toList();
665 }
667 /** Attribute a list of statements, returning nothing.
668 */
669 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
670 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
671 attribStat(l.head, env);
672 }
674 /** Attribute the arguments in a method call, returning the method kind.
675 */
676 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
677 int kind = VAL;
678 for (JCExpression arg : trees) {
679 Type argtype;
680 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
681 argtype = deferredAttr.new DeferredType(arg, env);
682 kind |= POLY;
683 } else {
684 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
685 }
686 argtypes.append(argtype);
687 }
688 return kind;
689 }
691 /** Attribute a type argument list, returning a list of types.
692 * Caller is responsible for calling checkRefTypes.
693 */
694 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
695 ListBuffer<Type> argtypes = new ListBuffer<Type>();
696 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
697 argtypes.append(attribType(l.head, env));
698 return argtypes.toList();
699 }
701 /** Attribute a type argument list, returning a list of types.
702 * Check that all the types are references.
703 */
704 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
705 List<Type> types = attribAnyTypes(trees, env);
706 return chk.checkRefTypes(trees, types);
707 }
709 /**
710 * Attribute type variables (of generic classes or methods).
711 * Compound types are attributed later in attribBounds.
712 * @param typarams the type variables to enter
713 * @param env the current environment
714 */
715 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
716 for (JCTypeParameter tvar : typarams) {
717 TypeVar a = (TypeVar)tvar.type;
718 a.tsym.flags_field |= UNATTRIBUTED;
719 a.bound = Type.noType;
720 if (!tvar.bounds.isEmpty()) {
721 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
722 for (JCExpression bound : tvar.bounds.tail)
723 bounds = bounds.prepend(attribType(bound, env));
724 types.setBounds(a, bounds.reverse());
725 } else {
726 // if no bounds are given, assume a single bound of
727 // java.lang.Object.
728 types.setBounds(a, List.of(syms.objectType));
729 }
730 a.tsym.flags_field &= ~UNATTRIBUTED;
731 }
732 for (JCTypeParameter tvar : typarams) {
733 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
734 }
735 }
737 /**
738 * Attribute the type references in a list of annotations.
739 */
740 void attribAnnotationTypes(List<JCAnnotation> annotations,
741 Env<AttrContext> env) {
742 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
743 JCAnnotation a = al.head;
744 attribType(a.annotationType, env);
745 }
746 }
748 /**
749 * Attribute a "lazy constant value".
750 * @param env The env for the const value
751 * @param initializer The initializer for the const value
752 * @param type The expected type, or null
753 * @see VarSymbol#setLazyConstValue
754 */
755 public Object attribLazyConstantValue(Env<AttrContext> env,
756 JCTree.JCExpression initializer,
757 Type type) {
759 /* When this env was created, it didn't have the correct lint nor had
760 * annotations has been processed.
761 * But now at this phase we have already processed annotations and the
762 * correct lint must have been set in chk, so we should use that one to
763 * attribute the initializer.
764 */
765 Lint prevLint = env.info.lint;
766 env.info.lint = chk.getLint();
768 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
770 try {
771 // Use null as symbol to not attach the type annotation to any symbol.
772 // The initializer will later also be visited and then we'll attach
773 // to the symbol.
774 // This prevents having multiple type annotations, just because of
775 // lazy constant value evaluation.
776 memberEnter.typeAnnotate(initializer, env, null);
777 annotate.flush();
778 Type itype = attribExpr(initializer, env, type);
779 if (itype.constValue() != null) {
780 return coerce(itype, type).constValue();
781 } else {
782 return null;
783 }
784 } finally {
785 env.info.lint = prevLint;
786 log.useSource(prevSource);
787 }
788 }
790 /** Attribute type reference in an `extends' or `implements' clause.
791 * Supertypes of anonymous inner classes are usually already attributed.
792 *
793 * @param tree The tree making up the type reference.
794 * @param env The environment current at the reference.
795 * @param classExpected true if only a class is expected here.
796 * @param interfaceExpected true if only an interface is expected here.
797 */
798 Type attribBase(JCTree tree,
799 Env<AttrContext> env,
800 boolean classExpected,
801 boolean interfaceExpected,
802 boolean checkExtensible) {
803 Type t = tree.type != null ?
804 tree.type :
805 attribType(tree, env);
806 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
807 }
808 Type checkBase(Type t,
809 JCTree tree,
810 Env<AttrContext> env,
811 boolean classExpected,
812 boolean interfaceExpected,
813 boolean checkExtensible) {
814 if (t.isErroneous())
815 return t;
816 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
817 // check that type variable is already visible
818 if (t.getUpperBound() == null) {
819 log.error(tree.pos(), "illegal.forward.ref");
820 return types.createErrorType(t);
821 }
822 } else {
823 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
824 }
825 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
826 log.error(tree.pos(), "intf.expected.here");
827 // return errType is necessary since otherwise there might
828 // be undetected cycles which cause attribution to loop
829 return types.createErrorType(t);
830 } else if (checkExtensible &&
831 classExpected &&
832 (t.tsym.flags() & INTERFACE) != 0) {
833 log.error(tree.pos(), "no.intf.expected.here");
834 return types.createErrorType(t);
835 }
836 if (checkExtensible &&
837 ((t.tsym.flags() & FINAL) != 0)) {
838 log.error(tree.pos(),
839 "cant.inherit.from.final", t.tsym);
840 }
841 chk.checkNonCyclic(tree.pos(), t);
842 return t;
843 }
845 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
846 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
847 id.type = env.info.scope.owner.type;
848 id.sym = env.info.scope.owner;
849 return id.type;
850 }
852 public void visitClassDef(JCClassDecl tree) {
853 // Local classes have not been entered yet, so we need to do it now:
854 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
855 enter.classEnter(tree, env);
857 ClassSymbol c = tree.sym;
858 if (c == null) {
859 // exit in case something drastic went wrong during enter.
860 result = null;
861 } else {
862 // make sure class has been completed:
863 c.complete();
865 // If this class appears as an anonymous class
866 // in a superclass constructor call where
867 // no explicit outer instance is given,
868 // disable implicit outer instance from being passed.
869 // (This would be an illegal access to "this before super").
870 if (env.info.isSelfCall &&
871 env.tree.hasTag(NEWCLASS) &&
872 ((JCNewClass) env.tree).encl == null)
873 {
874 c.flags_field |= NOOUTERTHIS;
875 }
876 attribClass(tree.pos(), c);
877 result = tree.type = c.type;
878 }
879 }
881 public void visitMethodDef(JCMethodDecl tree) {
882 MethodSymbol m = tree.sym;
883 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
885 Lint lint = env.info.lint.augment(m);
886 Lint prevLint = chk.setLint(lint);
887 MethodSymbol prevMethod = chk.setMethod(m);
888 try {
889 deferredLintHandler.flush(tree.pos());
890 chk.checkDeprecatedAnnotation(tree.pos(), m);
893 // Create a new environment with local scope
894 // for attributing the method.
895 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
896 localEnv.info.lint = lint;
898 attribStats(tree.typarams, localEnv);
900 // If we override any other methods, check that we do so properly.
901 // JLS ???
902 if (m.isStatic()) {
903 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
904 } else {
905 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
906 }
907 chk.checkOverride(tree, m);
909 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
910 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
911 }
913 // Enter all type parameters into the local method scope.
914 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
915 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
917 ClassSymbol owner = env.enclClass.sym;
918 if ((owner.flags() & ANNOTATION) != 0 &&
919 tree.params.nonEmpty())
920 log.error(tree.params.head.pos(),
921 "intf.annotation.members.cant.have.params");
923 // Attribute all value parameters.
924 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
925 attribStat(l.head, localEnv);
926 }
928 chk.checkVarargsMethodDecl(localEnv, tree);
930 // Check that type parameters are well-formed.
931 chk.validate(tree.typarams, localEnv);
933 // Check that result type is well-formed.
934 chk.validate(tree.restype, localEnv);
936 // Check that receiver type is well-formed.
937 if (tree.recvparam != null) {
938 // Use a new environment to check the receiver parameter.
939 // Otherwise I get "might not have been initialized" errors.
940 // Is there a better way?
941 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
942 attribType(tree.recvparam, newEnv);
943 chk.validate(tree.recvparam, newEnv);
944 }
946 // annotation method checks
947 if ((owner.flags() & ANNOTATION) != 0) {
948 // annotation method cannot have throws clause
949 if (tree.thrown.nonEmpty()) {
950 log.error(tree.thrown.head.pos(),
951 "throws.not.allowed.in.intf.annotation");
952 }
953 // annotation method cannot declare type-parameters
954 if (tree.typarams.nonEmpty()) {
955 log.error(tree.typarams.head.pos(),
956 "intf.annotation.members.cant.have.type.params");
957 }
958 // validate annotation method's return type (could be an annotation type)
959 chk.validateAnnotationType(tree.restype);
960 // ensure that annotation method does not clash with members of Object/Annotation
961 chk.validateAnnotationMethod(tree.pos(), m);
963 if (tree.defaultValue != null) {
964 // if default value is an annotation, check it is a well-formed
965 // annotation value (e.g. no duplicate values, no missing values, etc.)
966 chk.validateAnnotationTree(tree.defaultValue);
967 }
968 }
970 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
971 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
973 if (tree.body == null) {
974 // Empty bodies are only allowed for
975 // abstract, native, or interface methods, or for methods
976 // in a retrofit signature class.
977 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
978 !relax)
979 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
980 if (tree.defaultValue != null) {
981 if ((owner.flags() & ANNOTATION) == 0)
982 log.error(tree.pos(),
983 "default.allowed.in.intf.annotation.member");
984 }
985 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
986 if ((owner.flags() & INTERFACE) != 0) {
987 log.error(tree.body.pos(), "intf.meth.cant.have.body");
988 } else {
989 log.error(tree.pos(), "abstract.meth.cant.have.body");
990 }
991 } else if ((tree.mods.flags & NATIVE) != 0) {
992 log.error(tree.pos(), "native.meth.cant.have.body");
993 } else {
994 // Add an implicit super() call unless an explicit call to
995 // super(...) or this(...) is given
996 // or we are compiling class java.lang.Object.
997 if (tree.name == names.init && owner.type != syms.objectType) {
998 JCBlock body = tree.body;
999 if (body.stats.isEmpty() ||
1000 !TreeInfo.isSelfCall(body.stats.head)) {
1001 body.stats = body.stats.
1002 prepend(memberEnter.SuperCall(make.at(body.pos),
1003 List.<Type>nil(),
1004 List.<JCVariableDecl>nil(),
1005 false));
1006 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1007 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1008 TreeInfo.isSuperCall(body.stats.head)) {
1009 // enum constructors are not allowed to call super
1010 // directly, so make sure there aren't any super calls
1011 // in enum constructors, except in the compiler
1012 // generated one.
1013 log.error(tree.body.stats.head.pos(),
1014 "call.to.super.not.allowed.in.enum.ctor",
1015 env.enclClass.sym);
1016 }
1017 }
1019 // Attribute all type annotations in the body
1020 memberEnter.typeAnnotate(tree.body, localEnv, m);
1021 annotate.flush();
1023 // Attribute method body.
1024 attribStat(tree.body, localEnv);
1025 }
1027 localEnv.info.scope.leave();
1028 result = tree.type = m.type;
1029 chk.validateAnnotations(tree.mods.annotations, m);
1030 }
1031 finally {
1032 chk.setLint(prevLint);
1033 chk.setMethod(prevMethod);
1034 }
1035 }
1037 public void visitVarDef(JCVariableDecl tree) {
1038 // Local variables have not been entered yet, so we need to do it now:
1039 if (env.info.scope.owner.kind == MTH) {
1040 if (tree.sym != null) {
1041 // parameters have already been entered
1042 env.info.scope.enter(tree.sym);
1043 } else {
1044 memberEnter.memberEnter(tree, env);
1045 annotate.flush();
1046 }
1047 } else {
1048 if (tree.init != null) {
1049 // Field initializer expression need to be entered.
1050 memberEnter.typeAnnotate(tree.init, env, tree.sym);
1051 annotate.flush();
1052 }
1053 }
1055 VarSymbol v = tree.sym;
1056 Lint lint = env.info.lint.augment(v);
1057 Lint prevLint = chk.setLint(lint);
1059 // Check that the variable's declared type is well-formed.
1060 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1061 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1062 (tree.sym.flags() & PARAMETER) != 0;
1063 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1064 deferredLintHandler.flush(tree.pos());
1066 try {
1067 chk.checkDeprecatedAnnotation(tree.pos(), v);
1069 if (tree.init != null) {
1070 if ((v.flags_field & FINAL) != 0 &&
1071 !tree.init.hasTag(NEWCLASS) &&
1072 !tree.init.hasTag(LAMBDA) &&
1073 !tree.init.hasTag(REFERENCE)) {
1074 // In this case, `v' is final. Ensure that it's initializer is
1075 // evaluated.
1076 v.getConstValue(); // ensure initializer is evaluated
1077 } else {
1078 // Attribute initializer in a new environment
1079 // with the declared variable as owner.
1080 // Check that initializer conforms to variable's declared type.
1081 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1082 initEnv.info.lint = lint;
1083 // In order to catch self-references, we set the variable's
1084 // declaration position to maximal possible value, effectively
1085 // marking the variable as undefined.
1086 initEnv.info.enclVar = v;
1087 attribExpr(tree.init, initEnv, v.type);
1088 }
1089 }
1090 result = tree.type = v.type;
1091 chk.validateAnnotations(tree.mods.annotations, v);
1092 }
1093 finally {
1094 chk.setLint(prevLint);
1095 }
1096 }
1098 public void visitSkip(JCSkip tree) {
1099 result = null;
1100 }
1102 public void visitBlock(JCBlock tree) {
1103 if (env.info.scope.owner.kind == TYP) {
1104 // Block is a static or instance initializer;
1105 // let the owner of the environment be a freshly
1106 // created BLOCK-method.
1107 Env<AttrContext> localEnv =
1108 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1109 localEnv.info.scope.owner =
1110 new MethodSymbol(tree.flags | BLOCK |
1111 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1112 env.info.scope.owner);
1113 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1115 // Attribute all type annotations in the block
1116 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1117 annotate.flush();
1119 {
1120 // Store init and clinit type annotations with the ClassSymbol
1121 // to allow output in Gen.normalizeDefs.
1122 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1123 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1124 if ((tree.flags & STATIC) != 0) {
1125 cs.appendClassInitTypeAttributes(tas);
1126 } else {
1127 cs.appendInitTypeAttributes(tas);
1128 }
1129 }
1131 attribStats(tree.stats, localEnv);
1132 } else {
1133 // Create a new local environment with a local scope.
1134 Env<AttrContext> localEnv =
1135 env.dup(tree, env.info.dup(env.info.scope.dup()));
1136 try {
1137 attribStats(tree.stats, localEnv);
1138 } finally {
1139 localEnv.info.scope.leave();
1140 }
1141 }
1142 result = null;
1143 }
1145 public void visitDoLoop(JCDoWhileLoop tree) {
1146 attribStat(tree.body, env.dup(tree));
1147 attribExpr(tree.cond, env, syms.booleanType);
1148 result = null;
1149 }
1151 public void visitWhileLoop(JCWhileLoop tree) {
1152 attribExpr(tree.cond, env, syms.booleanType);
1153 attribStat(tree.body, env.dup(tree));
1154 result = null;
1155 }
1157 public void visitForLoop(JCForLoop tree) {
1158 Env<AttrContext> loopEnv =
1159 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1160 try {
1161 attribStats(tree.init, loopEnv);
1162 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1163 loopEnv.tree = tree; // before, we were not in loop!
1164 attribStats(tree.step, loopEnv);
1165 attribStat(tree.body, loopEnv);
1166 result = null;
1167 }
1168 finally {
1169 loopEnv.info.scope.leave();
1170 }
1171 }
1173 public void visitForeachLoop(JCEnhancedForLoop tree) {
1174 Env<AttrContext> loopEnv =
1175 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1176 try {
1177 //the Formal Parameter of a for-each loop is not in the scope when
1178 //attributing the for-each expression; we mimick this by attributing
1179 //the for-each expression first (against original scope).
1180 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1181 attribStat(tree.var, loopEnv);
1182 chk.checkNonVoid(tree.pos(), exprType);
1183 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1184 if (elemtype == null) {
1185 // or perhaps expr implements Iterable<T>?
1186 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1187 if (base == null) {
1188 log.error(tree.expr.pos(),
1189 "foreach.not.applicable.to.type",
1190 exprType,
1191 diags.fragment("type.req.array.or.iterable"));
1192 elemtype = types.createErrorType(exprType);
1193 } else {
1194 List<Type> iterableParams = base.allparams();
1195 elemtype = iterableParams.isEmpty()
1196 ? syms.objectType
1197 : types.upperBound(iterableParams.head);
1198 }
1199 }
1200 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1201 loopEnv.tree = tree; // before, we were not in loop!
1202 attribStat(tree.body, loopEnv);
1203 result = null;
1204 }
1205 finally {
1206 loopEnv.info.scope.leave();
1207 }
1208 }
1210 public void visitLabelled(JCLabeledStatement tree) {
1211 // Check that label is not used in an enclosing statement
1212 Env<AttrContext> env1 = env;
1213 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1214 if (env1.tree.hasTag(LABELLED) &&
1215 ((JCLabeledStatement) env1.tree).label == tree.label) {
1216 log.error(tree.pos(), "label.already.in.use",
1217 tree.label);
1218 break;
1219 }
1220 env1 = env1.next;
1221 }
1223 attribStat(tree.body, env.dup(tree));
1224 result = null;
1225 }
1227 public void visitSwitch(JCSwitch tree) {
1228 Type seltype = attribExpr(tree.selector, env);
1230 Env<AttrContext> switchEnv =
1231 env.dup(tree, env.info.dup(env.info.scope.dup()));
1233 try {
1235 boolean enumSwitch =
1236 allowEnums &&
1237 (seltype.tsym.flags() & Flags.ENUM) != 0;
1238 boolean stringSwitch = false;
1239 if (types.isSameType(seltype, syms.stringType)) {
1240 if (allowStringsInSwitch) {
1241 stringSwitch = true;
1242 } else {
1243 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1244 }
1245 }
1246 if (!enumSwitch && !stringSwitch)
1247 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1249 // Attribute all cases and
1250 // check that there are no duplicate case labels or default clauses.
1251 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1252 boolean hasDefault = false; // Is there a default label?
1253 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1254 JCCase c = l.head;
1255 Env<AttrContext> caseEnv =
1256 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1257 try {
1258 if (c.pat != null) {
1259 if (enumSwitch) {
1260 Symbol sym = enumConstant(c.pat, seltype);
1261 if (sym == null) {
1262 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1263 } else if (!labels.add(sym)) {
1264 log.error(c.pos(), "duplicate.case.label");
1265 }
1266 } else {
1267 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1268 if (!pattype.hasTag(ERROR)) {
1269 if (pattype.constValue() == null) {
1270 log.error(c.pat.pos(),
1271 (stringSwitch ? "string.const.req" : "const.expr.req"));
1272 } else if (labels.contains(pattype.constValue())) {
1273 log.error(c.pos(), "duplicate.case.label");
1274 } else {
1275 labels.add(pattype.constValue());
1276 }
1277 }
1278 }
1279 } else if (hasDefault) {
1280 log.error(c.pos(), "duplicate.default.label");
1281 } else {
1282 hasDefault = true;
1283 }
1284 attribStats(c.stats, caseEnv);
1285 } finally {
1286 caseEnv.info.scope.leave();
1287 addVars(c.stats, switchEnv.info.scope);
1288 }
1289 }
1291 result = null;
1292 }
1293 finally {
1294 switchEnv.info.scope.leave();
1295 }
1296 }
1297 // where
1298 /** Add any variables defined in stats to the switch scope. */
1299 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1300 for (;stats.nonEmpty(); stats = stats.tail) {
1301 JCTree stat = stats.head;
1302 if (stat.hasTag(VARDEF))
1303 switchScope.enter(((JCVariableDecl) stat).sym);
1304 }
1305 }
1306 // where
1307 /** Return the selected enumeration constant symbol, or null. */
1308 private Symbol enumConstant(JCTree tree, Type enumType) {
1309 if (!tree.hasTag(IDENT)) {
1310 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1311 return syms.errSymbol;
1312 }
1313 JCIdent ident = (JCIdent)tree;
1314 Name name = ident.name;
1315 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1316 e.scope != null; e = e.next()) {
1317 if (e.sym.kind == VAR) {
1318 Symbol s = ident.sym = e.sym;
1319 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1320 ident.type = s.type;
1321 return ((s.flags_field & Flags.ENUM) == 0)
1322 ? null : s;
1323 }
1324 }
1325 return null;
1326 }
1328 public void visitSynchronized(JCSynchronized tree) {
1329 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1330 attribStat(tree.body, env);
1331 result = null;
1332 }
1334 public void visitTry(JCTry tree) {
1335 // Create a new local environment with a local
1336 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1337 try {
1338 boolean isTryWithResource = tree.resources.nonEmpty();
1339 // Create a nested environment for attributing the try block if needed
1340 Env<AttrContext> tryEnv = isTryWithResource ?
1341 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1342 localEnv;
1343 try {
1344 // Attribute resource declarations
1345 for (JCTree resource : tree.resources) {
1346 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1347 @Override
1348 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1349 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1350 }
1351 };
1352 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1353 if (resource.hasTag(VARDEF)) {
1354 attribStat(resource, tryEnv);
1355 twrResult.check(resource, resource.type);
1357 //check that resource type cannot throw InterruptedException
1358 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1360 VarSymbol var = ((JCVariableDecl) resource).sym;
1361 var.setData(ElementKind.RESOURCE_VARIABLE);
1362 } else {
1363 attribTree(resource, tryEnv, twrResult);
1364 }
1365 }
1366 // Attribute body
1367 attribStat(tree.body, tryEnv);
1368 } finally {
1369 if (isTryWithResource)
1370 tryEnv.info.scope.leave();
1371 }
1373 // Attribute catch clauses
1374 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1375 JCCatch c = l.head;
1376 Env<AttrContext> catchEnv =
1377 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1378 try {
1379 Type ctype = attribStat(c.param, catchEnv);
1380 if (TreeInfo.isMultiCatch(c)) {
1381 //multi-catch parameter is implicitly marked as final
1382 c.param.sym.flags_field |= FINAL | UNION;
1383 }
1384 if (c.param.sym.kind == Kinds.VAR) {
1385 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1386 }
1387 chk.checkType(c.param.vartype.pos(),
1388 chk.checkClassType(c.param.vartype.pos(), ctype),
1389 syms.throwableType);
1390 attribStat(c.body, catchEnv);
1391 } finally {
1392 catchEnv.info.scope.leave();
1393 }
1394 }
1396 // Attribute finalizer
1397 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1398 result = null;
1399 }
1400 finally {
1401 localEnv.info.scope.leave();
1402 }
1403 }
1405 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1406 if (!resource.isErroneous() &&
1407 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1408 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1409 Symbol close = syms.noSymbol;
1410 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1411 try {
1412 close = rs.resolveQualifiedMethod(pos,
1413 env,
1414 resource,
1415 names.close,
1416 List.<Type>nil(),
1417 List.<Type>nil());
1418 }
1419 finally {
1420 log.popDiagnosticHandler(discardHandler);
1421 }
1422 if (close.kind == MTH &&
1423 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1424 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1425 env.info.lint.isEnabled(LintCategory.TRY)) {
1426 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1427 }
1428 }
1429 }
1431 public void visitConditional(JCConditional tree) {
1432 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1434 tree.polyKind = (!allowPoly ||
1435 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1436 isBooleanOrNumeric(env, tree)) ?
1437 PolyKind.STANDALONE : PolyKind.POLY;
1439 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1440 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1441 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1442 result = tree.type = types.createErrorType(resultInfo.pt);
1443 return;
1444 }
1446 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1447 unknownExprInfo :
1448 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1449 //this will use enclosing check context to check compatibility of
1450 //subexpression against target type; if we are in a method check context,
1451 //depending on whether boxing is allowed, we could have incompatibilities
1452 @Override
1453 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1454 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1455 }
1456 });
1458 Type truetype = attribTree(tree.truepart, env, condInfo);
1459 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1461 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1462 if (condtype.constValue() != null &&
1463 truetype.constValue() != null &&
1464 falsetype.constValue() != null &&
1465 !owntype.hasTag(NONE)) {
1466 //constant folding
1467 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1468 }
1469 result = check(tree, owntype, VAL, resultInfo);
1470 }
1471 //where
1472 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1473 switch (tree.getTag()) {
1474 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1475 ((JCLiteral)tree).typetag == BOOLEAN ||
1476 ((JCLiteral)tree).typetag == BOT;
1477 case LAMBDA: case REFERENCE: return false;
1478 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1479 case CONDEXPR:
1480 JCConditional condTree = (JCConditional)tree;
1481 return isBooleanOrNumeric(env, condTree.truepart) &&
1482 isBooleanOrNumeric(env, condTree.falsepart);
1483 case APPLY:
1484 JCMethodInvocation speculativeMethodTree =
1485 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1486 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1487 return types.unboxedTypeOrType(owntype).isPrimitive();
1488 case NEWCLASS:
1489 JCExpression className =
1490 removeClassParams.translate(((JCNewClass)tree).clazz);
1491 JCExpression speculativeNewClassTree =
1492 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1493 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1494 default:
1495 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1496 speculativeType = types.unboxedTypeOrType(speculativeType);
1497 return speculativeType.isPrimitive();
1498 }
1499 }
1500 //where
1501 TreeTranslator removeClassParams = new TreeTranslator() {
1502 @Override
1503 public void visitTypeApply(JCTypeApply tree) {
1504 result = translate(tree.clazz);
1505 }
1506 };
1508 /** Compute the type of a conditional expression, after
1509 * checking that it exists. See JLS 15.25. Does not take into
1510 * account the special case where condition and both arms
1511 * are constants.
1512 *
1513 * @param pos The source position to be used for error
1514 * diagnostics.
1515 * @param thentype The type of the expression's then-part.
1516 * @param elsetype The type of the expression's else-part.
1517 */
1518 private Type condType(DiagnosticPosition pos,
1519 Type thentype, Type elsetype) {
1520 // If same type, that is the result
1521 if (types.isSameType(thentype, elsetype))
1522 return thentype.baseType();
1524 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1525 ? thentype : types.unboxedType(thentype);
1526 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1527 ? elsetype : types.unboxedType(elsetype);
1529 // Otherwise, if both arms can be converted to a numeric
1530 // type, return the least numeric type that fits both arms
1531 // (i.e. return larger of the two, or return int if one
1532 // arm is short, the other is char).
1533 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1534 // If one arm has an integer subrange type (i.e., byte,
1535 // short, or char), and the other is an integer constant
1536 // that fits into the subrange, return the subrange type.
1537 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1538 elseUnboxed.hasTag(INT) &&
1539 types.isAssignable(elseUnboxed, thenUnboxed)) {
1540 return thenUnboxed.baseType();
1541 }
1542 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1543 thenUnboxed.hasTag(INT) &&
1544 types.isAssignable(thenUnboxed, elseUnboxed)) {
1545 return elseUnboxed.baseType();
1546 }
1548 for (TypeTag tag : primitiveTags) {
1549 Type candidate = syms.typeOfTag[tag.ordinal()];
1550 if (types.isSubtype(thenUnboxed, candidate) &&
1551 types.isSubtype(elseUnboxed, candidate)) {
1552 return candidate;
1553 }
1554 }
1555 }
1557 // Those were all the cases that could result in a primitive
1558 if (allowBoxing) {
1559 if (thentype.isPrimitive())
1560 thentype = types.boxedClass(thentype).type;
1561 if (elsetype.isPrimitive())
1562 elsetype = types.boxedClass(elsetype).type;
1563 }
1565 if (types.isSubtype(thentype, elsetype))
1566 return elsetype.baseType();
1567 if (types.isSubtype(elsetype, thentype))
1568 return thentype.baseType();
1570 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1571 log.error(pos, "neither.conditional.subtype",
1572 thentype, elsetype);
1573 return thentype.baseType();
1574 }
1576 // both are known to be reference types. The result is
1577 // lub(thentype,elsetype). This cannot fail, as it will
1578 // always be possible to infer "Object" if nothing better.
1579 return types.lub(thentype.baseType(), elsetype.baseType());
1580 }
1582 final static TypeTag[] primitiveTags = new TypeTag[]{
1583 BYTE,
1584 CHAR,
1585 SHORT,
1586 INT,
1587 LONG,
1588 FLOAT,
1589 DOUBLE,
1590 BOOLEAN,
1591 };
1593 public void visitIf(JCIf tree) {
1594 attribExpr(tree.cond, env, syms.booleanType);
1595 attribStat(tree.thenpart, env);
1596 if (tree.elsepart != null)
1597 attribStat(tree.elsepart, env);
1598 chk.checkEmptyIf(tree);
1599 result = null;
1600 }
1602 public void visitExec(JCExpressionStatement tree) {
1603 //a fresh environment is required for 292 inference to work properly ---
1604 //see Infer.instantiatePolymorphicSignatureInstance()
1605 Env<AttrContext> localEnv = env.dup(tree);
1606 attribExpr(tree.expr, localEnv);
1607 result = null;
1608 }
1610 public void visitBreak(JCBreak tree) {
1611 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1612 result = null;
1613 }
1615 public void visitContinue(JCContinue tree) {
1616 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1617 result = null;
1618 }
1619 //where
1620 /** Return the target of a break or continue statement, if it exists,
1621 * report an error if not.
1622 * Note: The target of a labelled break or continue is the
1623 * (non-labelled) statement tree referred to by the label,
1624 * not the tree representing the labelled statement itself.
1625 *
1626 * @param pos The position to be used for error diagnostics
1627 * @param tag The tag of the jump statement. This is either
1628 * Tree.BREAK or Tree.CONTINUE.
1629 * @param label The label of the jump statement, or null if no
1630 * label is given.
1631 * @param env The environment current at the jump statement.
1632 */
1633 private JCTree findJumpTarget(DiagnosticPosition pos,
1634 JCTree.Tag tag,
1635 Name label,
1636 Env<AttrContext> env) {
1637 // Search environments outwards from the point of jump.
1638 Env<AttrContext> env1 = env;
1639 LOOP:
1640 while (env1 != null) {
1641 switch (env1.tree.getTag()) {
1642 case LABELLED:
1643 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1644 if (label == labelled.label) {
1645 // If jump is a continue, check that target is a loop.
1646 if (tag == CONTINUE) {
1647 if (!labelled.body.hasTag(DOLOOP) &&
1648 !labelled.body.hasTag(WHILELOOP) &&
1649 !labelled.body.hasTag(FORLOOP) &&
1650 !labelled.body.hasTag(FOREACHLOOP))
1651 log.error(pos, "not.loop.label", label);
1652 // Found labelled statement target, now go inwards
1653 // to next non-labelled tree.
1654 return TreeInfo.referencedStatement(labelled);
1655 } else {
1656 return labelled;
1657 }
1658 }
1659 break;
1660 case DOLOOP:
1661 case WHILELOOP:
1662 case FORLOOP:
1663 case FOREACHLOOP:
1664 if (label == null) return env1.tree;
1665 break;
1666 case SWITCH:
1667 if (label == null && tag == BREAK) return env1.tree;
1668 break;
1669 case LAMBDA:
1670 case METHODDEF:
1671 case CLASSDEF:
1672 break LOOP;
1673 default:
1674 }
1675 env1 = env1.next;
1676 }
1677 if (label != null)
1678 log.error(pos, "undef.label", label);
1679 else if (tag == CONTINUE)
1680 log.error(pos, "cont.outside.loop");
1681 else
1682 log.error(pos, "break.outside.switch.loop");
1683 return null;
1684 }
1686 public void visitReturn(JCReturn tree) {
1687 // Check that there is an enclosing method which is
1688 // nested within than the enclosing class.
1689 if (env.info.returnResult == null) {
1690 log.error(tree.pos(), "ret.outside.meth");
1691 } else {
1692 // Attribute return expression, if it exists, and check that
1693 // it conforms to result type of enclosing method.
1694 if (tree.expr != null) {
1695 if (env.info.returnResult.pt.hasTag(VOID)) {
1696 env.info.returnResult.checkContext.report(tree.expr.pos(),
1697 diags.fragment("unexpected.ret.val"));
1698 }
1699 attribTree(tree.expr, env, env.info.returnResult);
1700 } else if (!env.info.returnResult.pt.hasTag(VOID)) {
1701 env.info.returnResult.checkContext.report(tree.pos(),
1702 diags.fragment("missing.ret.val"));
1703 }
1704 }
1705 result = null;
1706 }
1708 public void visitThrow(JCThrow tree) {
1709 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1710 if (allowPoly) {
1711 chk.checkType(tree, owntype, syms.throwableType);
1712 }
1713 result = null;
1714 }
1716 public void visitAssert(JCAssert tree) {
1717 attribExpr(tree.cond, env, syms.booleanType);
1718 if (tree.detail != null) {
1719 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1720 }
1721 result = null;
1722 }
1724 /** Visitor method for method invocations.
1725 * NOTE: The method part of an application will have in its type field
1726 * the return type of the method, not the method's type itself!
1727 */
1728 public void visitApply(JCMethodInvocation tree) {
1729 // The local environment of a method application is
1730 // a new environment nested in the current one.
1731 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1733 // The types of the actual method arguments.
1734 List<Type> argtypes;
1736 // The types of the actual method type arguments.
1737 List<Type> typeargtypes = null;
1739 Name methName = TreeInfo.name(tree.meth);
1741 boolean isConstructorCall =
1742 methName == names._this || methName == names._super;
1744 ListBuffer<Type> argtypesBuf = ListBuffer.lb();
1745 if (isConstructorCall) {
1746 // We are seeing a ...this(...) or ...super(...) call.
1747 // Check that this is the first statement in a constructor.
1748 if (checkFirstConstructorStat(tree, env)) {
1750 // Record the fact
1751 // that this is a constructor call (using isSelfCall).
1752 localEnv.info.isSelfCall = true;
1754 // Attribute arguments, yielding list of argument types.
1755 attribArgs(tree.args, localEnv, argtypesBuf);
1756 argtypes = argtypesBuf.toList();
1757 typeargtypes = attribTypes(tree.typeargs, localEnv);
1759 // Variable `site' points to the class in which the called
1760 // constructor is defined.
1761 Type site = env.enclClass.sym.type;
1762 if (methName == names._super) {
1763 if (site == syms.objectType) {
1764 log.error(tree.meth.pos(), "no.superclass", site);
1765 site = types.createErrorType(syms.objectType);
1766 } else {
1767 site = types.supertype(site);
1768 }
1769 }
1771 if (site.hasTag(CLASS)) {
1772 Type encl = site.getEnclosingType();
1773 while (encl != null && encl.hasTag(TYPEVAR))
1774 encl = encl.getUpperBound();
1775 if (encl.hasTag(CLASS)) {
1776 // we are calling a nested class
1778 if (tree.meth.hasTag(SELECT)) {
1779 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1781 // We are seeing a prefixed call, of the form
1782 // <expr>.super(...).
1783 // Check that the prefix expression conforms
1784 // to the outer instance type of the class.
1785 chk.checkRefType(qualifier.pos(),
1786 attribExpr(qualifier, localEnv,
1787 encl));
1788 } else if (methName == names._super) {
1789 // qualifier omitted; check for existence
1790 // of an appropriate implicit qualifier.
1791 rs.resolveImplicitThis(tree.meth.pos(),
1792 localEnv, site, true);
1793 }
1794 } else if (tree.meth.hasTag(SELECT)) {
1795 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1796 site.tsym);
1797 }
1799 // if we're calling a java.lang.Enum constructor,
1800 // prefix the implicit String and int parameters
1801 if (site.tsym == syms.enumSym && allowEnums)
1802 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1804 // Resolve the called constructor under the assumption
1805 // that we are referring to a superclass instance of the
1806 // current instance (JLS ???).
1807 boolean selectSuperPrev = localEnv.info.selectSuper;
1808 localEnv.info.selectSuper = true;
1809 localEnv.info.pendingResolutionPhase = null;
1810 Symbol sym = rs.resolveConstructor(
1811 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1812 localEnv.info.selectSuper = selectSuperPrev;
1814 // Set method symbol to resolved constructor...
1815 TreeInfo.setSymbol(tree.meth, sym);
1817 // ...and check that it is legal in the current context.
1818 // (this will also set the tree's type)
1819 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1820 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1821 }
1822 // Otherwise, `site' is an error type and we do nothing
1823 }
1824 result = tree.type = syms.voidType;
1825 } else {
1826 // Otherwise, we are seeing a regular method call.
1827 // Attribute the arguments, yielding list of argument types, ...
1828 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1829 argtypes = argtypesBuf.toList();
1830 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1832 // ... and attribute the method using as a prototype a methodtype
1833 // whose formal argument types is exactly the list of actual
1834 // arguments (this will also set the method symbol).
1835 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1836 localEnv.info.pendingResolutionPhase = null;
1837 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1839 // Compute the result type.
1840 Type restype = mtype.getReturnType();
1841 if (restype.hasTag(WILDCARD))
1842 throw new AssertionError(mtype);
1844 Type qualifier = (tree.meth.hasTag(SELECT))
1845 ? ((JCFieldAccess) tree.meth).selected.type
1846 : env.enclClass.sym.type;
1847 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1849 chk.checkRefTypes(tree.typeargs, typeargtypes);
1851 // Check that value of resulting type is admissible in the
1852 // current context. Also, capture the return type
1853 result = check(tree, capture(restype), VAL, resultInfo);
1854 }
1855 chk.validate(tree.typeargs, localEnv);
1856 }
1857 //where
1858 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1859 if (allowCovariantReturns &&
1860 methodName == names.clone &&
1861 types.isArray(qualifierType)) {
1862 // as a special case, array.clone() has a result that is
1863 // the same as static type of the array being cloned
1864 return qualifierType;
1865 } else if (allowGenerics &&
1866 methodName == names.getClass &&
1867 argtypes.isEmpty()) {
1868 // as a special case, x.getClass() has type Class<? extends |X|>
1869 return new ClassType(restype.getEnclosingType(),
1870 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1871 BoundKind.EXTENDS,
1872 syms.boundClass)),
1873 restype.tsym);
1874 } else {
1875 return restype;
1876 }
1877 }
1879 /** Check that given application node appears as first statement
1880 * in a constructor call.
1881 * @param tree The application node
1882 * @param env The environment current at the application.
1883 */
1884 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1885 JCMethodDecl enclMethod = env.enclMethod;
1886 if (enclMethod != null && enclMethod.name == names.init) {
1887 JCBlock body = enclMethod.body;
1888 if (body.stats.head.hasTag(EXEC) &&
1889 ((JCExpressionStatement) body.stats.head).expr == tree)
1890 return true;
1891 }
1892 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1893 TreeInfo.name(tree.meth));
1894 return false;
1895 }
1897 /** Obtain a method type with given argument types.
1898 */
1899 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1900 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1901 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1902 }
1904 public void visitNewClass(final JCNewClass tree) {
1905 Type owntype = types.createErrorType(tree.type);
1907 // The local environment of a class creation is
1908 // a new environment nested in the current one.
1909 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1911 // The anonymous inner class definition of the new expression,
1912 // if one is defined by it.
1913 JCClassDecl cdef = tree.def;
1915 // If enclosing class is given, attribute it, and
1916 // complete class name to be fully qualified
1917 JCExpression clazz = tree.clazz; // Class field following new
1918 JCExpression clazzid; // Identifier in class field
1919 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1920 annoclazzid = null;
1922 if (clazz.hasTag(TYPEAPPLY)) {
1923 clazzid = ((JCTypeApply) clazz).clazz;
1924 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1925 annoclazzid = (JCAnnotatedType) clazzid;
1926 clazzid = annoclazzid.underlyingType;
1927 }
1928 } else {
1929 if (clazz.hasTag(ANNOTATED_TYPE)) {
1930 annoclazzid = (JCAnnotatedType) clazz;
1931 clazzid = annoclazzid.underlyingType;
1932 } else {
1933 clazzid = clazz;
1934 }
1935 }
1937 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1939 if (tree.encl != null) {
1940 // We are seeing a qualified new, of the form
1941 // <expr>.new C <...> (...) ...
1942 // In this case, we let clazz stand for the name of the
1943 // allocated class C prefixed with the type of the qualifier
1944 // expression, so that we can
1945 // resolve it with standard techniques later. I.e., if
1946 // <expr> has type T, then <expr>.new C <...> (...)
1947 // yields a clazz T.C.
1948 Type encltype = chk.checkRefType(tree.encl.pos(),
1949 attribExpr(tree.encl, env));
1950 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1951 // from expr to the combined type, or not? Yes, do this.
1952 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1953 ((JCIdent) clazzid).name);
1955 if (clazz.hasTag(ANNOTATED_TYPE)) {
1956 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1957 List<JCAnnotation> annos = annoType.annotations;
1959 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1960 clazzid1 = make.at(tree.pos).
1961 TypeApply(clazzid1,
1962 ((JCTypeApply) clazz).arguments);
1963 }
1965 clazzid1 = make.at(tree.pos).
1966 AnnotatedType(annos, clazzid1);
1967 } else if (clazz.hasTag(TYPEAPPLY)) {
1968 clazzid1 = make.at(tree.pos).
1969 TypeApply(clazzid1,
1970 ((JCTypeApply) clazz).arguments);
1971 }
1973 clazz = clazzid1;
1974 }
1976 // Attribute clazz expression and store
1977 // symbol + type back into the attributed tree.
1978 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1979 attribIdentAsEnumType(env, (JCIdent)clazz) :
1980 attribType(clazz, env);
1982 clazztype = chk.checkDiamond(tree, clazztype);
1983 chk.validate(clazz, localEnv);
1984 if (tree.encl != null) {
1985 // We have to work in this case to store
1986 // symbol + type back into the attributed tree.
1987 tree.clazz.type = clazztype;
1988 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1989 clazzid.type = ((JCIdent) clazzid).sym.type;
1990 if (annoclazzid != null) {
1991 annoclazzid.type = clazzid.type;
1992 }
1993 if (!clazztype.isErroneous()) {
1994 if (cdef != null && clazztype.tsym.isInterface()) {
1995 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1996 } else if (clazztype.tsym.isStatic()) {
1997 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1998 }
1999 }
2000 } else if (!clazztype.tsym.isInterface() &&
2001 clazztype.getEnclosingType().hasTag(CLASS)) {
2002 // Check for the existence of an apropos outer instance
2003 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2004 }
2006 // Attribute constructor arguments.
2007 ListBuffer<Type> argtypesBuf = ListBuffer.lb();
2008 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
2009 List<Type> argtypes = argtypesBuf.toList();
2010 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2012 // If we have made no mistakes in the class type...
2013 if (clazztype.hasTag(CLASS)) {
2014 // Enums may not be instantiated except implicitly
2015 if (allowEnums &&
2016 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2017 (!env.tree.hasTag(VARDEF) ||
2018 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2019 ((JCVariableDecl) env.tree).init != tree))
2020 log.error(tree.pos(), "enum.cant.be.instantiated");
2021 // Check that class is not abstract
2022 if (cdef == null &&
2023 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2024 log.error(tree.pos(), "abstract.cant.be.instantiated",
2025 clazztype.tsym);
2026 } else if (cdef != null && clazztype.tsym.isInterface()) {
2027 // Check that no constructor arguments are given to
2028 // anonymous classes implementing an interface
2029 if (!argtypes.isEmpty())
2030 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2032 if (!typeargtypes.isEmpty())
2033 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2035 // Error recovery: pretend no arguments were supplied.
2036 argtypes = List.nil();
2037 typeargtypes = List.nil();
2038 } else if (TreeInfo.isDiamond(tree)) {
2039 ClassType site = new ClassType(clazztype.getEnclosingType(),
2040 clazztype.tsym.type.getTypeArguments(),
2041 clazztype.tsym);
2043 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2044 diamondEnv.info.selectSuper = cdef != null;
2045 diamondEnv.info.pendingResolutionPhase = null;
2047 //if the type of the instance creation expression is a class type
2048 //apply method resolution inference (JLS 15.12.2.7). The return type
2049 //of the resolved constructor will be a partially instantiated type
2050 Symbol constructor = rs.resolveDiamond(tree.pos(),
2051 diamondEnv,
2052 site,
2053 argtypes,
2054 typeargtypes);
2055 tree.constructor = constructor.baseSymbol();
2057 final TypeSymbol csym = clazztype.tsym;
2058 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2059 @Override
2060 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2061 enclosingContext.report(tree.clazz,
2062 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2063 }
2064 });
2065 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2066 constructorType = checkId(tree, site,
2067 constructor,
2068 diamondEnv,
2069 diamondResult);
2071 tree.clazz.type = types.createErrorType(clazztype);
2072 if (!constructorType.isErroneous()) {
2073 tree.clazz.type = clazztype = constructorType.getReturnType();
2074 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2075 }
2076 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2077 }
2079 // Resolve the called constructor under the assumption
2080 // that we are referring to a superclass instance of the
2081 // current instance (JLS ???).
2082 else {
2083 //the following code alters some of the fields in the current
2084 //AttrContext - hence, the current context must be dup'ed in
2085 //order to avoid downstream failures
2086 Env<AttrContext> rsEnv = localEnv.dup(tree);
2087 rsEnv.info.selectSuper = cdef != null;
2088 rsEnv.info.pendingResolutionPhase = null;
2089 tree.constructor = rs.resolveConstructor(
2090 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2091 if (cdef == null) { //do not check twice!
2092 tree.constructorType = checkId(tree,
2093 clazztype,
2094 tree.constructor,
2095 rsEnv,
2096 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2097 if (rsEnv.info.lastResolveVarargs())
2098 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2099 }
2100 if (cdef == null &&
2101 !clazztype.isErroneous() &&
2102 clazztype.getTypeArguments().nonEmpty() &&
2103 findDiamonds) {
2104 findDiamond(localEnv, tree, clazztype);
2105 }
2106 }
2108 if (cdef != null) {
2109 // We are seeing an anonymous class instance creation.
2110 // In this case, the class instance creation
2111 // expression
2112 //
2113 // E.new <typeargs1>C<typargs2>(args) { ... }
2114 //
2115 // is represented internally as
2116 //
2117 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2118 //
2119 // This expression is then *transformed* as follows:
2120 //
2121 // (1) add a STATIC flag to the class definition
2122 // if the current environment is static
2123 // (2) add an extends or implements clause
2124 // (3) add a constructor.
2125 //
2126 // For instance, if C is a class, and ET is the type of E,
2127 // the expression
2128 //
2129 // E.new <typeargs1>C<typargs2>(args) { ... }
2130 //
2131 // is translated to (where X is a fresh name and typarams is the
2132 // parameter list of the super constructor):
2133 //
2134 // new <typeargs1>X(<*nullchk*>E, args) where
2135 // X extends C<typargs2> {
2136 // <typarams> X(ET e, args) {
2137 // e.<typeargs1>super(args)
2138 // }
2139 // ...
2140 // }
2141 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2143 if (clazztype.tsym.isInterface()) {
2144 cdef.implementing = List.of(clazz);
2145 } else {
2146 cdef.extending = clazz;
2147 }
2149 attribStat(cdef, localEnv);
2151 checkLambdaCandidate(tree, cdef.sym, clazztype);
2153 // If an outer instance is given,
2154 // prefix it to the constructor arguments
2155 // and delete it from the new expression
2156 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2157 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2158 argtypes = argtypes.prepend(tree.encl.type);
2159 tree.encl = null;
2160 }
2162 // Reassign clazztype and recompute constructor.
2163 clazztype = cdef.sym.type;
2164 Symbol sym = tree.constructor = rs.resolveConstructor(
2165 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2166 Assert.check(sym.kind < AMBIGUOUS);
2167 tree.constructor = sym;
2168 tree.constructorType = checkId(tree,
2169 clazztype,
2170 tree.constructor,
2171 localEnv,
2172 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2173 } else {
2174 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2175 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2176 tree.clazz.type.tsym);
2177 }
2178 }
2180 if (tree.constructor != null && tree.constructor.kind == MTH)
2181 owntype = clazztype;
2182 }
2183 result = check(tree, owntype, VAL, resultInfo);
2184 chk.validate(tree.typeargs, localEnv);
2185 }
2186 //where
2187 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2188 JCTypeApply ta = (JCTypeApply)tree.clazz;
2189 List<JCExpression> prevTypeargs = ta.arguments;
2190 try {
2191 //create a 'fake' diamond AST node by removing type-argument trees
2192 ta.arguments = List.nil();
2193 ResultInfo findDiamondResult = new ResultInfo(VAL,
2194 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2195 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2196 Type polyPt = allowPoly ?
2197 syms.objectType :
2198 clazztype;
2199 if (!inferred.isErroneous() &&
2200 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings)) {
2201 String key = types.isSameType(clazztype, inferred) ?
2202 "diamond.redundant.args" :
2203 "diamond.redundant.args.1";
2204 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2205 }
2206 } finally {
2207 ta.arguments = prevTypeargs;
2208 }
2209 }
2211 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2212 if (allowLambda &&
2213 identifyLambdaCandidate &&
2214 clazztype.hasTag(CLASS) &&
2215 !pt().hasTag(NONE) &&
2216 types.isFunctionalInterface(clazztype.tsym)) {
2217 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2218 int count = 0;
2219 boolean found = false;
2220 for (Symbol sym : csym.members().getElements()) {
2221 if ((sym.flags() & SYNTHETIC) != 0 ||
2222 sym.isConstructor()) continue;
2223 count++;
2224 if (sym.kind != MTH ||
2225 !sym.name.equals(descriptor.name)) continue;
2226 Type mtype = types.memberType(clazztype, sym);
2227 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2228 found = true;
2229 }
2230 }
2231 if (found && count == 1) {
2232 log.note(tree.def, "potential.lambda.found");
2233 }
2234 }
2235 }
2237 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2238 Symbol sym) {
2239 // Ensure that no declaration annotations are present.
2240 // Note that a tree type might be an AnnotatedType with
2241 // empty annotations, if only declaration annotations were given.
2242 // This method will raise an error for such a type.
2243 for (JCAnnotation ai : annotations) {
2244 if (TypeAnnotations.annotationType(syms, names, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2245 log.error(ai.pos(), "annotation.type.not.applicable");
2246 }
2247 }
2248 }
2251 /** Make an attributed null check tree.
2252 */
2253 public JCExpression makeNullCheck(JCExpression arg) {
2254 // optimization: X.this is never null; skip null check
2255 Name name = TreeInfo.name(arg);
2256 if (name == names._this || name == names._super) return arg;
2258 JCTree.Tag optag = NULLCHK;
2259 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2260 tree.operator = syms.nullcheck;
2261 tree.type = arg.type;
2262 return tree;
2263 }
2265 public void visitNewArray(JCNewArray tree) {
2266 Type owntype = types.createErrorType(tree.type);
2267 Env<AttrContext> localEnv = env.dup(tree);
2268 Type elemtype;
2269 if (tree.elemtype != null) {
2270 elemtype = attribType(tree.elemtype, localEnv);
2271 chk.validate(tree.elemtype, localEnv);
2272 owntype = elemtype;
2273 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2274 attribExpr(l.head, localEnv, syms.intType);
2275 owntype = new ArrayType(owntype, syms.arrayClass);
2276 }
2277 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2278 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2279 tree.elemtype.type.tsym);
2280 }
2281 } else {
2282 // we are seeing an untyped aggregate { ... }
2283 // this is allowed only if the prototype is an array
2284 if (pt().hasTag(ARRAY)) {
2285 elemtype = types.elemtype(pt());
2286 } else {
2287 if (!pt().hasTag(ERROR)) {
2288 log.error(tree.pos(), "illegal.initializer.for.type",
2289 pt());
2290 }
2291 elemtype = types.createErrorType(pt());
2292 }
2293 }
2294 if (tree.elems != null) {
2295 attribExprs(tree.elems, localEnv, elemtype);
2296 owntype = new ArrayType(elemtype, syms.arrayClass);
2297 }
2298 if (!types.isReifiable(elemtype))
2299 log.error(tree.pos(), "generic.array.creation");
2300 result = check(tree, owntype, VAL, resultInfo);
2301 }
2303 /*
2304 * A lambda expression can only be attributed when a target-type is available.
2305 * In addition, if the target-type is that of a functional interface whose
2306 * descriptor contains inference variables in argument position the lambda expression
2307 * is 'stuck' (see DeferredAttr).
2308 */
2309 @Override
2310 public void visitLambda(final JCLambda that) {
2311 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2312 if (pt().hasTag(NONE)) {
2313 //lambda only allowed in assignment or method invocation/cast context
2314 log.error(that.pos(), "unexpected.lambda");
2315 }
2316 result = that.type = types.createErrorType(pt());
2317 return;
2318 }
2319 //create an environment for attribution of the lambda expression
2320 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2321 boolean needsRecovery =
2322 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2323 try {
2324 Type target = pt();
2325 List<Type> explicitParamTypes = null;
2326 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2327 //attribute lambda parameters
2328 attribStats(that.params, localEnv);
2329 explicitParamTypes = TreeInfo.types(that.params);
2330 target = infer.instantiateFunctionalInterface(that, target, explicitParamTypes, resultInfo.checkContext);
2331 }
2333 Type lambdaType;
2334 if (pt() != Type.recoveryType) {
2335 target = targetChecker.visit(target, that);
2336 lambdaType = types.findDescriptorType(target);
2337 chk.checkFunctionalInterface(that, target);
2338 } else {
2339 target = Type.recoveryType;
2340 lambdaType = fallbackDescriptorType(that);
2341 }
2343 setFunctionalInfo(that, pt(), lambdaType, target, resultInfo.checkContext.inferenceContext());
2345 if (lambdaType.hasTag(FORALL)) {
2346 //lambda expression target desc cannot be a generic method
2347 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2348 lambdaType, kindName(target.tsym), target.tsym));
2349 result = that.type = types.createErrorType(pt());
2350 return;
2351 }
2353 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2354 //add param type info in the AST
2355 List<Type> actuals = lambdaType.getParameterTypes();
2356 List<JCVariableDecl> params = that.params;
2358 boolean arityMismatch = false;
2360 while (params.nonEmpty()) {
2361 if (actuals.isEmpty()) {
2362 //not enough actuals to perform lambda parameter inference
2363 arityMismatch = true;
2364 }
2365 //reset previously set info
2366 Type argType = arityMismatch ?
2367 syms.errType :
2368 actuals.head;
2369 params.head.vartype = make.at(params.head).Type(argType);
2370 params.head.sym = null;
2371 actuals = actuals.isEmpty() ?
2372 actuals :
2373 actuals.tail;
2374 params = params.tail;
2375 }
2377 //attribute lambda parameters
2378 attribStats(that.params, localEnv);
2380 if (arityMismatch) {
2381 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2382 result = that.type = types.createErrorType(target);
2383 return;
2384 }
2385 }
2387 //from this point on, no recovery is needed; if we are in assignment context
2388 //we will be able to attribute the whole lambda body, regardless of errors;
2389 //if we are in a 'check' method context, and the lambda is not compatible
2390 //with the target-type, it will be recovered anyway in Attr.checkId
2391 needsRecovery = false;
2393 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2394 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2395 new FunctionalReturnContext(resultInfo.checkContext);
2397 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2398 recoveryInfo :
2399 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2400 localEnv.info.returnResult = bodyResultInfo;
2402 Log.DeferredDiagnosticHandler lambdaDeferredHandler = new Log.DeferredDiagnosticHandler(log);
2403 try {
2404 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2405 attribTree(that.getBody(), localEnv, bodyResultInfo);
2406 } else {
2407 JCBlock body = (JCBlock)that.body;
2408 attribStats(body.stats, localEnv);
2409 }
2411 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.SPECULATIVE) {
2412 //check for errors in lambda body
2413 for (JCDiagnostic deferredDiag : lambdaDeferredHandler.getDiagnostics()) {
2414 if (deferredDiag.getKind() == JCDiagnostic.Kind.ERROR) {
2415 resultInfo.checkContext
2416 .report(that, diags.fragment("bad.arg.types.in.lambda", TreeInfo.types(that.params),
2417 deferredDiag)); //hidden diag parameter
2418 //we mark the lambda as erroneous - this is crucial in the recovery step
2419 //as parameter-dependent type error won't be reported in that stage,
2420 //meaning that a lambda will be deemed erroeneous only if there is
2421 //a target-independent error (which will cause method diagnostic
2422 //to be skipped).
2423 result = that.type = types.createErrorType(target);
2424 return;
2425 }
2426 }
2427 }
2428 } finally {
2429 lambdaDeferredHandler.reportDeferredDiagnostics();
2430 log.popDiagnosticHandler(lambdaDeferredHandler);
2431 }
2433 result = check(that, target, VAL, resultInfo);
2435 boolean isSpeculativeRound =
2436 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2438 postAttr(that);
2439 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2441 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2443 if (!isSpeculativeRound) {
2444 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, target);
2445 }
2446 result = check(that, target, VAL, resultInfo);
2447 } catch (Types.FunctionDescriptorLookupError ex) {
2448 JCDiagnostic cause = ex.getDiagnostic();
2449 resultInfo.checkContext.report(that, cause);
2450 result = that.type = types.createErrorType(pt());
2451 return;
2452 } finally {
2453 localEnv.info.scope.leave();
2454 if (needsRecovery) {
2455 attribTree(that, env, recoveryInfo);
2456 }
2457 }
2458 }
2459 //where
2460 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2462 @Override
2463 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2464 return t.isCompound() ?
2465 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2466 }
2468 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2469 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2470 Type target = null;
2471 for (Type bound : ict.getExplicitComponents()) {
2472 TypeSymbol boundSym = bound.tsym;
2473 if (types.isFunctionalInterface(boundSym) &&
2474 types.findDescriptorSymbol(boundSym) == desc) {
2475 target = bound;
2476 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2477 //bound must be an interface
2478 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2479 }
2480 }
2481 return target != null ?
2482 target :
2483 ict.getExplicitComponents().head; //error recovery
2484 }
2486 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2487 ListBuffer<Type> targs = ListBuffer.lb();
2488 ListBuffer<Type> supertypes = ListBuffer.lb();
2489 for (Type i : ict.interfaces_field) {
2490 if (i.isParameterized()) {
2491 targs.appendList(i.tsym.type.allparams());
2492 }
2493 supertypes.append(i.tsym.type);
2494 }
2495 IntersectionClassType notionalIntf =
2496 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2497 notionalIntf.allparams_field = targs.toList();
2498 notionalIntf.tsym.flags_field |= INTERFACE;
2499 return notionalIntf.tsym;
2500 }
2502 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2503 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2504 diags.fragment(key, args)));
2505 }
2506 };
2508 private Type fallbackDescriptorType(JCExpression tree) {
2509 switch (tree.getTag()) {
2510 case LAMBDA:
2511 JCLambda lambda = (JCLambda)tree;
2512 List<Type> argtypes = List.nil();
2513 for (JCVariableDecl param : lambda.params) {
2514 argtypes = param.vartype != null ?
2515 argtypes.append(param.vartype.type) :
2516 argtypes.append(syms.errType);
2517 }
2518 return new MethodType(argtypes, Type.recoveryType,
2519 List.of(syms.throwableType), syms.methodClass);
2520 case REFERENCE:
2521 return new MethodType(List.<Type>nil(), Type.recoveryType,
2522 List.of(syms.throwableType), syms.methodClass);
2523 default:
2524 Assert.error("Cannot get here!");
2525 }
2526 return null;
2527 }
2529 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2530 final InferenceContext inferenceContext, final Type... ts) {
2531 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2532 }
2534 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2535 final InferenceContext inferenceContext, final List<Type> ts) {
2536 if (inferenceContext.free(ts)) {
2537 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2538 @Override
2539 public void typesInferred(InferenceContext inferenceContext) {
2540 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2541 }
2542 });
2543 } else {
2544 for (Type t : ts) {
2545 rs.checkAccessibleType(env, t);
2546 }
2547 }
2548 }
2550 /**
2551 * Lambda/method reference have a special check context that ensures
2552 * that i.e. a lambda return type is compatible with the expected
2553 * type according to both the inherited context and the assignment
2554 * context.
2555 */
2556 class FunctionalReturnContext extends Check.NestedCheckContext {
2558 FunctionalReturnContext(CheckContext enclosingContext) {
2559 super(enclosingContext);
2560 }
2562 @Override
2563 public boolean compatible(Type found, Type req, Warner warn) {
2564 //return type must be compatible in both current context and assignment context
2565 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2566 }
2568 @Override
2569 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2570 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2571 }
2572 }
2574 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2576 JCExpression expr;
2578 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2579 super(enclosingContext);
2580 this.expr = expr;
2581 }
2583 @Override
2584 public boolean compatible(Type found, Type req, Warner warn) {
2585 //a void return is compatible with an expression statement lambda
2586 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2587 super.compatible(found, req, warn);
2588 }
2589 }
2591 /**
2592 * Lambda compatibility. Check that given return types, thrown types, parameter types
2593 * are compatible with the expected functional interface descriptor. This means that:
2594 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2595 * types must be compatible with the return type of the expected descriptor;
2596 * (iii) thrown types must be 'included' in the thrown types list of the expected
2597 * descriptor.
2598 */
2599 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2600 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2602 //return values have already been checked - but if lambda has no return
2603 //values, we must ensure that void/value compatibility is correct;
2604 //this amounts at checking that, if a lambda body can complete normally,
2605 //the descriptor's return type must be void
2606 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2607 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2608 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2609 diags.fragment("missing.ret.val", returnType)));
2610 }
2612 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2613 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2614 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2615 }
2617 if (!speculativeAttr) {
2618 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2619 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2620 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2621 }
2622 }
2623 }
2625 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2626 Env<AttrContext> lambdaEnv;
2627 Symbol owner = env.info.scope.owner;
2628 if (owner.kind == VAR && owner.owner.kind == TYP) {
2629 //field initializer
2630 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2631 lambdaEnv.info.scope.owner =
2632 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2633 env.info.scope.owner);
2634 } else {
2635 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2636 }
2637 return lambdaEnv;
2638 }
2640 @Override
2641 public void visitReference(final JCMemberReference that) {
2642 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2643 if (pt().hasTag(NONE)) {
2644 //method reference only allowed in assignment or method invocation/cast context
2645 log.error(that.pos(), "unexpected.mref");
2646 }
2647 result = that.type = types.createErrorType(pt());
2648 return;
2649 }
2650 final Env<AttrContext> localEnv = env.dup(that);
2651 try {
2652 //attribute member reference qualifier - if this is a constructor
2653 //reference, the expected kind must be a type
2654 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2656 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2657 exprType = chk.checkConstructorRefType(that.expr, exprType);
2658 }
2660 if (exprType.isErroneous()) {
2661 //if the qualifier expression contains problems,
2662 //give up attribution of method reference
2663 result = that.type = exprType;
2664 return;
2665 }
2667 if (TreeInfo.isStaticSelector(that.expr, names)) {
2668 //if the qualifier is a type, validate it; raw warning check is
2669 //omitted as we don't know at this stage as to whether this is a
2670 //raw selector (because of inference)
2671 chk.validate(that.expr, env, false);
2672 }
2674 //attrib type-arguments
2675 List<Type> typeargtypes = List.nil();
2676 if (that.typeargs != null) {
2677 typeargtypes = attribTypes(that.typeargs, localEnv);
2678 }
2680 Type target;
2681 Type desc;
2682 if (pt() != Type.recoveryType) {
2683 target = targetChecker.visit(pt(), that);
2684 desc = types.findDescriptorType(target);
2685 chk.checkFunctionalInterface(that, target);
2686 } else {
2687 target = Type.recoveryType;
2688 desc = fallbackDescriptorType(that);
2689 }
2691 setFunctionalInfo(that, pt(), desc, target, resultInfo.checkContext.inferenceContext());
2692 List<Type> argtypes = desc.getParameterTypes();
2694 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult =
2695 rs.resolveMemberReference(that.pos(), localEnv, that,
2696 that.expr.type, that.name, argtypes, typeargtypes, true, rs.resolveMethodCheck);
2698 Symbol refSym = refResult.fst;
2699 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2701 if (refSym.kind != MTH) {
2702 boolean targetError;
2703 switch (refSym.kind) {
2704 case ABSENT_MTH:
2705 targetError = false;
2706 break;
2707 case WRONG_MTH:
2708 case WRONG_MTHS:
2709 case AMBIGUOUS:
2710 case HIDDEN:
2711 case STATICERR:
2712 case MISSING_ENCL:
2713 targetError = true;
2714 break;
2715 default:
2716 Assert.error("unexpected result kind " + refSym.kind);
2717 targetError = false;
2718 }
2720 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2721 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2723 JCDiagnostic.DiagnosticType diagKind = targetError ?
2724 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2726 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2727 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2729 if (targetError && target == Type.recoveryType) {
2730 //a target error doesn't make sense during recovery stage
2731 //as we don't know what actual parameter types are
2732 result = that.type = target;
2733 return;
2734 } else {
2735 if (targetError) {
2736 resultInfo.checkContext.report(that, diag);
2737 } else {
2738 log.report(diag);
2739 }
2740 result = that.type = types.createErrorType(target);
2741 return;
2742 }
2743 }
2745 that.sym = refSym.baseSymbol();
2746 that.kind = lookupHelper.referenceKind(that.sym);
2747 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2749 if (desc.getReturnType() == Type.recoveryType) {
2750 // stop here
2751 result = that.type = target;
2752 return;
2753 }
2755 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2757 if (that.getMode() == ReferenceMode.INVOKE &&
2758 TreeInfo.isStaticSelector(that.expr, names) &&
2759 that.kind.isUnbound() &&
2760 !desc.getParameterTypes().head.isParameterized()) {
2761 chk.checkRaw(that.expr, localEnv);
2762 }
2764 if (!that.kind.isUnbound() &&
2765 that.getMode() == ReferenceMode.INVOKE &&
2766 TreeInfo.isStaticSelector(that.expr, names) &&
2767 !that.sym.isStatic()) {
2768 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2769 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2770 result = that.type = types.createErrorType(target);
2771 return;
2772 }
2774 if (that.kind.isUnbound() &&
2775 that.getMode() == ReferenceMode.INVOKE &&
2776 TreeInfo.isStaticSelector(that.expr, names) &&
2777 that.sym.isStatic()) {
2778 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2779 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2780 result = that.type = types.createErrorType(target);
2781 return;
2782 }
2784 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2785 exprType.getTypeArguments().nonEmpty()) {
2786 //static ref with class type-args
2787 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2788 diags.fragment("static.mref.with.targs"));
2789 result = that.type = types.createErrorType(target);
2790 return;
2791 }
2793 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2794 !that.kind.isUnbound()) {
2795 //no static bound mrefs
2796 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2797 diags.fragment("static.bound.mref"));
2798 result = that.type = types.createErrorType(target);
2799 return;
2800 }
2802 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2803 // Check that super-qualified symbols are not abstract (JLS)
2804 rs.checkNonAbstract(that.pos(), that.sym);
2805 }
2806 }
2808 that.sym = refSym.baseSymbol();
2809 that.kind = lookupHelper.referenceKind(that.sym);
2811 ResultInfo checkInfo =
2812 resultInfo.dup(newMethodTemplate(
2813 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2814 lookupHelper.argtypes,
2815 typeargtypes));
2817 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2819 if (!refType.isErroneous()) {
2820 refType = types.createMethodTypeWithReturn(refType,
2821 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2822 }
2824 //go ahead with standard method reference compatibility check - note that param check
2825 //is a no-op (as this has been taken care during method applicability)
2826 boolean isSpeculativeRound =
2827 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2828 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2829 if (!isSpeculativeRound) {
2830 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2831 }
2832 result = check(that, target, VAL, resultInfo);
2833 } catch (Types.FunctionDescriptorLookupError ex) {
2834 JCDiagnostic cause = ex.getDiagnostic();
2835 resultInfo.checkContext.report(that, cause);
2836 result = that.type = types.createErrorType(pt());
2837 return;
2838 }
2839 }
2840 //where
2841 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2842 //if this is a constructor reference, the expected kind must be a type
2843 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2844 }
2847 @SuppressWarnings("fallthrough")
2848 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2849 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2851 Type resType;
2852 switch (tree.getMode()) {
2853 case NEW:
2854 if (!tree.expr.type.isRaw()) {
2855 resType = tree.expr.type;
2856 break;
2857 }
2858 default:
2859 resType = refType.getReturnType();
2860 }
2862 Type incompatibleReturnType = resType;
2864 if (returnType.hasTag(VOID)) {
2865 incompatibleReturnType = null;
2866 }
2868 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2869 if (resType.isErroneous() ||
2870 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2871 incompatibleReturnType = null;
2872 }
2873 }
2875 if (incompatibleReturnType != null) {
2876 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2877 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2878 }
2880 if (!speculativeAttr) {
2881 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2882 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2883 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2884 }
2885 }
2886 }
2888 /**
2889 * Set functional type info on the underlying AST. Note: as the target descriptor
2890 * might contain inference variables, we might need to register an hook in the
2891 * current inference context.
2892 */
2893 private void setFunctionalInfo(final JCFunctionalExpression fExpr, final Type pt,
2894 final Type descriptorType, final Type primaryTarget, InferenceContext inferenceContext) {
2895 if (inferenceContext.free(descriptorType)) {
2896 inferenceContext.addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2897 public void typesInferred(InferenceContext inferenceContext) {
2898 setFunctionalInfo(fExpr, pt, inferenceContext.asInstType(descriptorType),
2899 inferenceContext.asInstType(primaryTarget), inferenceContext);
2900 }
2901 });
2902 } else {
2903 ListBuffer<TypeSymbol> targets = ListBuffer.lb();
2904 if (pt.hasTag(CLASS)) {
2905 if (pt.isCompound()) {
2906 targets.append(primaryTarget.tsym); //this goes first
2907 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2908 if (t != primaryTarget) {
2909 targets.append(t.tsym);
2910 }
2911 }
2912 } else {
2913 targets.append(pt.tsym);
2914 }
2915 }
2916 fExpr.targets = targets.toList();
2917 fExpr.descriptorType = descriptorType;
2918 }
2919 }
2921 public void visitParens(JCParens tree) {
2922 Type owntype = attribTree(tree.expr, env, resultInfo);
2923 result = check(tree, owntype, pkind(), resultInfo);
2924 Symbol sym = TreeInfo.symbol(tree);
2925 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2926 log.error(tree.pos(), "illegal.start.of.type");
2927 }
2929 public void visitAssign(JCAssign tree) {
2930 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2931 Type capturedType = capture(owntype);
2932 attribExpr(tree.rhs, env, owntype);
2933 result = check(tree, capturedType, VAL, resultInfo);
2934 }
2936 public void visitAssignop(JCAssignOp tree) {
2937 // Attribute arguments.
2938 Type owntype = attribTree(tree.lhs, env, varInfo);
2939 Type operand = attribExpr(tree.rhs, env);
2940 // Find operator.
2941 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2942 tree.pos(), tree.getTag().noAssignOp(), env,
2943 owntype, operand);
2945 if (operator.kind == MTH &&
2946 !owntype.isErroneous() &&
2947 !operand.isErroneous()) {
2948 chk.checkOperator(tree.pos(),
2949 (OperatorSymbol)operator,
2950 tree.getTag().noAssignOp(),
2951 owntype,
2952 operand);
2953 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2954 chk.checkCastable(tree.rhs.pos(),
2955 operator.type.getReturnType(),
2956 owntype);
2957 }
2958 result = check(tree, owntype, VAL, resultInfo);
2959 }
2961 public void visitUnary(JCUnary tree) {
2962 // Attribute arguments.
2963 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2964 ? attribTree(tree.arg, env, varInfo)
2965 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2967 // Find operator.
2968 Symbol operator = tree.operator =
2969 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2971 Type owntype = types.createErrorType(tree.type);
2972 if (operator.kind == MTH &&
2973 !argtype.isErroneous()) {
2974 owntype = (tree.getTag().isIncOrDecUnaryOp())
2975 ? tree.arg.type
2976 : operator.type.getReturnType();
2977 int opc = ((OperatorSymbol)operator).opcode;
2979 // If the argument is constant, fold it.
2980 if (argtype.constValue() != null) {
2981 Type ctype = cfolder.fold1(opc, argtype);
2982 if (ctype != null) {
2983 owntype = cfolder.coerce(ctype, owntype);
2985 // Remove constant types from arguments to
2986 // conserve space. The parser will fold concatenations
2987 // of string literals; the code here also
2988 // gets rid of intermediate results when some of the
2989 // operands are constant identifiers.
2990 if (tree.arg.type.tsym == syms.stringType.tsym) {
2991 tree.arg.type = syms.stringType;
2992 }
2993 }
2994 }
2995 }
2996 result = check(tree, owntype, VAL, resultInfo);
2997 }
2999 public void visitBinary(JCBinary tree) {
3000 // Attribute arguments.
3001 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3002 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3004 // Find operator.
3005 Symbol operator = tree.operator =
3006 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3008 Type owntype = types.createErrorType(tree.type);
3009 if (operator.kind == MTH &&
3010 !left.isErroneous() &&
3011 !right.isErroneous()) {
3012 owntype = operator.type.getReturnType();
3013 int opc = chk.checkOperator(tree.lhs.pos(),
3014 (OperatorSymbol)operator,
3015 tree.getTag(),
3016 left,
3017 right);
3019 // If both arguments are constants, fold them.
3020 if (left.constValue() != null && right.constValue() != null) {
3021 Type ctype = cfolder.fold2(opc, left, right);
3022 if (ctype != null) {
3023 owntype = cfolder.coerce(ctype, owntype);
3025 // Remove constant types from arguments to
3026 // conserve space. The parser will fold concatenations
3027 // of string literals; the code here also
3028 // gets rid of intermediate results when some of the
3029 // operands are constant identifiers.
3030 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3031 tree.lhs.type = syms.stringType;
3032 }
3033 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3034 tree.rhs.type = syms.stringType;
3035 }
3036 }
3037 }
3039 // Check that argument types of a reference ==, != are
3040 // castable to each other, (JLS???).
3041 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3042 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3043 log.error(tree.pos(), "incomparable.types", left, right);
3044 }
3045 }
3047 chk.checkDivZero(tree.rhs.pos(), operator, right);
3048 }
3049 result = check(tree, owntype, VAL, resultInfo);
3050 }
3052 public void visitTypeCast(final JCTypeCast tree) {
3053 Type clazztype = attribType(tree.clazz, env);
3054 chk.validate(tree.clazz, env, false);
3055 //a fresh environment is required for 292 inference to work properly ---
3056 //see Infer.instantiatePolymorphicSignatureInstance()
3057 Env<AttrContext> localEnv = env.dup(tree);
3058 //should we propagate the target type?
3059 final ResultInfo castInfo;
3060 JCExpression expr = TreeInfo.skipParens(tree.expr);
3061 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3062 if (isPoly) {
3063 //expression is a poly - we need to propagate target type info
3064 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3065 @Override
3066 public boolean compatible(Type found, Type req, Warner warn) {
3067 return types.isCastable(found, req, warn);
3068 }
3069 });
3070 } else {
3071 //standalone cast - target-type info is not propagated
3072 castInfo = unknownExprInfo;
3073 }
3074 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3075 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3076 if (exprtype.constValue() != null)
3077 owntype = cfolder.coerce(exprtype, owntype);
3078 result = check(tree, capture(owntype), VAL, resultInfo);
3079 if (!isPoly)
3080 chk.checkRedundantCast(localEnv, tree);
3081 }
3083 public void visitTypeTest(JCInstanceOf tree) {
3084 Type exprtype = chk.checkNullOrRefType(
3085 tree.expr.pos(), attribExpr(tree.expr, env));
3086 Type clazztype = chk.checkReifiableReferenceType(
3087 tree.clazz.pos(), attribType(tree.clazz, env));
3088 chk.validate(tree.clazz, env, false);
3089 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3090 result = check(tree, syms.booleanType, VAL, resultInfo);
3091 }
3093 public void visitIndexed(JCArrayAccess tree) {
3094 Type owntype = types.createErrorType(tree.type);
3095 Type atype = attribExpr(tree.indexed, env);
3096 attribExpr(tree.index, env, syms.intType);
3097 if (types.isArray(atype))
3098 owntype = types.elemtype(atype);
3099 else if (!atype.hasTag(ERROR))
3100 log.error(tree.pos(), "array.req.but.found", atype);
3101 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3102 result = check(tree, owntype, VAR, resultInfo);
3103 }
3105 public void visitIdent(JCIdent tree) {
3106 Symbol sym;
3108 // Find symbol
3109 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3110 // If we are looking for a method, the prototype `pt' will be a
3111 // method type with the type of the call's arguments as parameters.
3112 env.info.pendingResolutionPhase = null;
3113 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3114 } else if (tree.sym != null && tree.sym.kind != VAR) {
3115 sym = tree.sym;
3116 } else {
3117 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3118 }
3119 tree.sym = sym;
3121 // (1) Also find the environment current for the class where
3122 // sym is defined (`symEnv').
3123 // Only for pre-tiger versions (1.4 and earlier):
3124 // (2) Also determine whether we access symbol out of an anonymous
3125 // class in a this or super call. This is illegal for instance
3126 // members since such classes don't carry a this$n link.
3127 // (`noOuterThisPath').
3128 Env<AttrContext> symEnv = env;
3129 boolean noOuterThisPath = false;
3130 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3131 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3132 sym.owner.kind == TYP &&
3133 tree.name != names._this && tree.name != names._super) {
3135 // Find environment in which identifier is defined.
3136 while (symEnv.outer != null &&
3137 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3138 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3139 noOuterThisPath = !allowAnonOuterThis;
3140 symEnv = symEnv.outer;
3141 }
3142 }
3144 // If symbol is a variable, ...
3145 if (sym.kind == VAR) {
3146 VarSymbol v = (VarSymbol)sym;
3148 // ..., evaluate its initializer, if it has one, and check for
3149 // illegal forward reference.
3150 checkInit(tree, env, v, false);
3152 // If we are expecting a variable (as opposed to a value), check
3153 // that the variable is assignable in the current environment.
3154 if (pkind() == VAR)
3155 checkAssignable(tree.pos(), v, null, env);
3156 }
3158 // In a constructor body,
3159 // if symbol is a field or instance method, check that it is
3160 // not accessed before the supertype constructor is called.
3161 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3162 (sym.kind & (VAR | MTH)) != 0 &&
3163 sym.owner.kind == TYP &&
3164 (sym.flags() & STATIC) == 0) {
3165 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3166 }
3167 Env<AttrContext> env1 = env;
3168 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3169 // If the found symbol is inaccessible, then it is
3170 // accessed through an enclosing instance. Locate this
3171 // enclosing instance:
3172 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3173 env1 = env1.outer;
3174 }
3175 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3176 }
3178 public void visitSelect(JCFieldAccess tree) {
3179 // Determine the expected kind of the qualifier expression.
3180 int skind = 0;
3181 if (tree.name == names._this || tree.name == names._super ||
3182 tree.name == names._class)
3183 {
3184 skind = TYP;
3185 } else {
3186 if ((pkind() & PCK) != 0) skind = skind | PCK;
3187 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3188 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3189 }
3191 // Attribute the qualifier expression, and determine its symbol (if any).
3192 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3193 if ((pkind() & (PCK | TYP)) == 0)
3194 site = capture(site); // Capture field access
3196 // don't allow T.class T[].class, etc
3197 if (skind == TYP) {
3198 Type elt = site;
3199 while (elt.hasTag(ARRAY))
3200 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3201 if (elt.hasTag(TYPEVAR)) {
3202 log.error(tree.pos(), "type.var.cant.be.deref");
3203 result = types.createErrorType(tree.type);
3204 return;
3205 }
3206 }
3208 // If qualifier symbol is a type or `super', assert `selectSuper'
3209 // for the selection. This is relevant for determining whether
3210 // protected symbols are accessible.
3211 Symbol sitesym = TreeInfo.symbol(tree.selected);
3212 boolean selectSuperPrev = env.info.selectSuper;
3213 env.info.selectSuper =
3214 sitesym != null &&
3215 sitesym.name == names._super;
3217 // Determine the symbol represented by the selection.
3218 env.info.pendingResolutionPhase = null;
3219 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3220 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3221 site = capture(site);
3222 sym = selectSym(tree, sitesym, site, env, resultInfo);
3223 }
3224 boolean varArgs = env.info.lastResolveVarargs();
3225 tree.sym = sym;
3227 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3228 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3229 site = capture(site);
3230 }
3232 // If that symbol is a variable, ...
3233 if (sym.kind == VAR) {
3234 VarSymbol v = (VarSymbol)sym;
3236 // ..., evaluate its initializer, if it has one, and check for
3237 // illegal forward reference.
3238 checkInit(tree, env, v, true);
3240 // If we are expecting a variable (as opposed to a value), check
3241 // that the variable is assignable in the current environment.
3242 if (pkind() == VAR)
3243 checkAssignable(tree.pos(), v, tree.selected, env);
3244 }
3246 if (sitesym != null &&
3247 sitesym.kind == VAR &&
3248 ((VarSymbol)sitesym).isResourceVariable() &&
3249 sym.kind == MTH &&
3250 sym.name.equals(names.close) &&
3251 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3252 env.info.lint.isEnabled(LintCategory.TRY)) {
3253 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3254 }
3256 // Disallow selecting a type from an expression
3257 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3258 tree.type = check(tree.selected, pt(),
3259 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3260 }
3262 if (isType(sitesym)) {
3263 if (sym.name == names._this) {
3264 // If `C' is the currently compiled class, check that
3265 // C.this' does not appear in a call to a super(...)
3266 if (env.info.isSelfCall &&
3267 site.tsym == env.enclClass.sym) {
3268 chk.earlyRefError(tree.pos(), sym);
3269 }
3270 } else {
3271 // Check if type-qualified fields or methods are static (JLS)
3272 if ((sym.flags() & STATIC) == 0 &&
3273 !env.next.tree.hasTag(REFERENCE) &&
3274 sym.name != names._super &&
3275 (sym.kind == VAR || sym.kind == MTH)) {
3276 rs.accessBase(rs.new StaticError(sym),
3277 tree.pos(), site, sym.name, true);
3278 }
3279 }
3280 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3281 // If the qualified item is not a type and the selected item is static, report
3282 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3283 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3284 }
3286 // If we are selecting an instance member via a `super', ...
3287 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3289 // Check that super-qualified symbols are not abstract (JLS)
3290 rs.checkNonAbstract(tree.pos(), sym);
3292 if (site.isRaw()) {
3293 // Determine argument types for site.
3294 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3295 if (site1 != null) site = site1;
3296 }
3297 }
3299 env.info.selectSuper = selectSuperPrev;
3300 result = checkId(tree, site, sym, env, resultInfo);
3301 }
3302 //where
3303 /** Determine symbol referenced by a Select expression,
3304 *
3305 * @param tree The select tree.
3306 * @param site The type of the selected expression,
3307 * @param env The current environment.
3308 * @param resultInfo The current result.
3309 */
3310 private Symbol selectSym(JCFieldAccess tree,
3311 Symbol location,
3312 Type site,
3313 Env<AttrContext> env,
3314 ResultInfo resultInfo) {
3315 DiagnosticPosition pos = tree.pos();
3316 Name name = tree.name;
3317 switch (site.getTag()) {
3318 case PACKAGE:
3319 return rs.accessBase(
3320 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3321 pos, location, site, name, true);
3322 case ARRAY:
3323 case CLASS:
3324 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3325 return rs.resolveQualifiedMethod(
3326 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3327 } else if (name == names._this || name == names._super) {
3328 return rs.resolveSelf(pos, env, site.tsym, name);
3329 } else if (name == names._class) {
3330 // In this case, we have already made sure in
3331 // visitSelect that qualifier expression is a type.
3332 Type t = syms.classType;
3333 List<Type> typeargs = allowGenerics
3334 ? List.of(types.erasure(site))
3335 : List.<Type>nil();
3336 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3337 return new VarSymbol(
3338 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3339 } else {
3340 // We are seeing a plain identifier as selector.
3341 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3342 if ((resultInfo.pkind & ERRONEOUS) == 0)
3343 sym = rs.accessBase(sym, pos, location, site, name, true);
3344 return sym;
3345 }
3346 case WILDCARD:
3347 throw new AssertionError(tree);
3348 case TYPEVAR:
3349 // Normally, site.getUpperBound() shouldn't be null.
3350 // It should only happen during memberEnter/attribBase
3351 // when determining the super type which *must* beac
3352 // done before attributing the type variables. In
3353 // other words, we are seeing this illegal program:
3354 // class B<T> extends A<T.foo> {}
3355 Symbol sym = (site.getUpperBound() != null)
3356 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3357 : null;
3358 if (sym == null) {
3359 log.error(pos, "type.var.cant.be.deref");
3360 return syms.errSymbol;
3361 } else {
3362 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3363 rs.new AccessError(env, site, sym) :
3364 sym;
3365 rs.accessBase(sym2, pos, location, site, name, true);
3366 return sym;
3367 }
3368 case ERROR:
3369 // preserve identifier names through errors
3370 return types.createErrorType(name, site.tsym, site).tsym;
3371 default:
3372 // The qualifier expression is of a primitive type -- only
3373 // .class is allowed for these.
3374 if (name == names._class) {
3375 // In this case, we have already made sure in Select that
3376 // qualifier expression is a type.
3377 Type t = syms.classType;
3378 Type arg = types.boxedClass(site).type;
3379 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3380 return new VarSymbol(
3381 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3382 } else {
3383 log.error(pos, "cant.deref", site);
3384 return syms.errSymbol;
3385 }
3386 }
3387 }
3389 /** Determine type of identifier or select expression and check that
3390 * (1) the referenced symbol is not deprecated
3391 * (2) the symbol's type is safe (@see checkSafe)
3392 * (3) if symbol is a variable, check that its type and kind are
3393 * compatible with the prototype and protokind.
3394 * (4) if symbol is an instance field of a raw type,
3395 * which is being assigned to, issue an unchecked warning if its
3396 * type changes under erasure.
3397 * (5) if symbol is an instance method of a raw type, issue an
3398 * unchecked warning if its argument types change under erasure.
3399 * If checks succeed:
3400 * If symbol is a constant, return its constant type
3401 * else if symbol is a method, return its result type
3402 * otherwise return its type.
3403 * Otherwise return errType.
3404 *
3405 * @param tree The syntax tree representing the identifier
3406 * @param site If this is a select, the type of the selected
3407 * expression, otherwise the type of the current class.
3408 * @param sym The symbol representing the identifier.
3409 * @param env The current environment.
3410 * @param resultInfo The expected result
3411 */
3412 Type checkId(JCTree tree,
3413 Type site,
3414 Symbol sym,
3415 Env<AttrContext> env,
3416 ResultInfo resultInfo) {
3417 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3418 checkMethodId(tree, site, sym, env, resultInfo) :
3419 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3420 }
3422 Type checkMethodId(JCTree tree,
3423 Type site,
3424 Symbol sym,
3425 Env<AttrContext> env,
3426 ResultInfo resultInfo) {
3427 boolean isPolymorhicSignature =
3428 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3429 return isPolymorhicSignature ?
3430 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3431 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3432 }
3434 Type checkSigPolyMethodId(JCTree tree,
3435 Type site,
3436 Symbol sym,
3437 Env<AttrContext> env,
3438 ResultInfo resultInfo) {
3439 //recover original symbol for signature polymorphic methods
3440 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3441 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3442 return sym.type;
3443 }
3445 Type checkMethodIdInternal(JCTree tree,
3446 Type site,
3447 Symbol sym,
3448 Env<AttrContext> env,
3449 ResultInfo resultInfo) {
3450 if ((resultInfo.pkind & POLY) != 0) {
3451 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3452 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3453 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3454 return owntype;
3455 } else {
3456 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3457 }
3458 }
3460 Type checkIdInternal(JCTree tree,
3461 Type site,
3462 Symbol sym,
3463 Type pt,
3464 Env<AttrContext> env,
3465 ResultInfo resultInfo) {
3466 if (pt.isErroneous()) {
3467 return types.createErrorType(site);
3468 }
3469 Type owntype; // The computed type of this identifier occurrence.
3470 switch (sym.kind) {
3471 case TYP:
3472 // For types, the computed type equals the symbol's type,
3473 // except for two situations:
3474 owntype = sym.type;
3475 if (owntype.hasTag(CLASS)) {
3476 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3477 Type ownOuter = owntype.getEnclosingType();
3479 // (a) If the symbol's type is parameterized, erase it
3480 // because no type parameters were given.
3481 // We recover generic outer type later in visitTypeApply.
3482 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3483 owntype = types.erasure(owntype);
3484 }
3486 // (b) If the symbol's type is an inner class, then
3487 // we have to interpret its outer type as a superclass
3488 // of the site type. Example:
3489 //
3490 // class Tree<A> { class Visitor { ... } }
3491 // class PointTree extends Tree<Point> { ... }
3492 // ...PointTree.Visitor...
3493 //
3494 // Then the type of the last expression above is
3495 // Tree<Point>.Visitor.
3496 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3497 Type normOuter = site;
3498 if (normOuter.hasTag(CLASS)) {
3499 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3500 if (site.isAnnotated()) {
3501 // Propagate any type annotations.
3502 // TODO: should asEnclosingSuper do this?
3503 // Note that the type annotations in site will be updated
3504 // by annotateType. Therefore, modify site instead
3505 // of creating a new AnnotatedType.
3506 ((AnnotatedType)site).underlyingType = normOuter;
3507 normOuter = site;
3508 }
3509 }
3510 if (normOuter == null) // perhaps from an import
3511 normOuter = types.erasure(ownOuter);
3512 if (normOuter != ownOuter)
3513 owntype = new ClassType(
3514 normOuter, List.<Type>nil(), owntype.tsym);
3515 }
3516 }
3517 break;
3518 case VAR:
3519 VarSymbol v = (VarSymbol)sym;
3520 // Test (4): if symbol is an instance field of a raw type,
3521 // which is being assigned to, issue an unchecked warning if
3522 // its type changes under erasure.
3523 if (allowGenerics &&
3524 resultInfo.pkind == VAR &&
3525 v.owner.kind == TYP &&
3526 (v.flags() & STATIC) == 0 &&
3527 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3528 Type s = types.asOuterSuper(site, v.owner);
3529 if (s != null &&
3530 s.isRaw() &&
3531 !types.isSameType(v.type, v.erasure(types))) {
3532 chk.warnUnchecked(tree.pos(),
3533 "unchecked.assign.to.var",
3534 v, s);
3535 }
3536 }
3537 // The computed type of a variable is the type of the
3538 // variable symbol, taken as a member of the site type.
3539 owntype = (sym.owner.kind == TYP &&
3540 sym.name != names._this && sym.name != names._super)
3541 ? types.memberType(site, sym)
3542 : sym.type;
3544 // If the variable is a constant, record constant value in
3545 // computed type.
3546 if (v.getConstValue() != null && isStaticReference(tree))
3547 owntype = owntype.constType(v.getConstValue());
3549 if (resultInfo.pkind == VAL) {
3550 owntype = capture(owntype); // capture "names as expressions"
3551 }
3552 break;
3553 case MTH: {
3554 owntype = checkMethod(site, sym,
3555 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3556 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3557 resultInfo.pt.getTypeArguments());
3558 break;
3559 }
3560 case PCK: case ERR:
3561 owntype = sym.type;
3562 break;
3563 default:
3564 throw new AssertionError("unexpected kind: " + sym.kind +
3565 " in tree " + tree);
3566 }
3568 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3569 // (for constructors, the error was given when the constructor was
3570 // resolved)
3572 if (sym.name != names.init) {
3573 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3574 chk.checkSunAPI(tree.pos(), sym);
3575 chk.checkProfile(tree.pos(), sym);
3576 }
3578 // Test (3): if symbol is a variable, check that its type and
3579 // kind are compatible with the prototype and protokind.
3580 return check(tree, owntype, sym.kind, resultInfo);
3581 }
3583 /** Check that variable is initialized and evaluate the variable's
3584 * initializer, if not yet done. Also check that variable is not
3585 * referenced before it is defined.
3586 * @param tree The tree making up the variable reference.
3587 * @param env The current environment.
3588 * @param v The variable's symbol.
3589 */
3590 private void checkInit(JCTree tree,
3591 Env<AttrContext> env,
3592 VarSymbol v,
3593 boolean onlyWarning) {
3594 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3595 // tree.pos + " " + v.pos + " " +
3596 // Resolve.isStatic(env));//DEBUG
3598 // A forward reference is diagnosed if the declaration position
3599 // of the variable is greater than the current tree position
3600 // and the tree and variable definition occur in the same class
3601 // definition. Note that writes don't count as references.
3602 // This check applies only to class and instance
3603 // variables. Local variables follow different scope rules,
3604 // and are subject to definite assignment checking.
3605 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3606 v.owner.kind == TYP &&
3607 canOwnInitializer(owner(env)) &&
3608 v.owner == env.info.scope.owner.enclClass() &&
3609 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3610 (!env.tree.hasTag(ASSIGN) ||
3611 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3612 String suffix = (env.info.enclVar == v) ?
3613 "self.ref" : "forward.ref";
3614 if (!onlyWarning || isStaticEnumField(v)) {
3615 log.error(tree.pos(), "illegal." + suffix);
3616 } else if (useBeforeDeclarationWarning) {
3617 log.warning(tree.pos(), suffix, v);
3618 }
3619 }
3621 v.getConstValue(); // ensure initializer is evaluated
3623 checkEnumInitializer(tree, env, v);
3624 }
3626 /**
3627 * Check for illegal references to static members of enum. In
3628 * an enum type, constructors and initializers may not
3629 * reference its static members unless they are constant.
3630 *
3631 * @param tree The tree making up the variable reference.
3632 * @param env The current environment.
3633 * @param v The variable's symbol.
3634 * @jls section 8.9 Enums
3635 */
3636 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3637 // JLS:
3638 //
3639 // "It is a compile-time error to reference a static field
3640 // of an enum type that is not a compile-time constant
3641 // (15.28) from constructors, instance initializer blocks,
3642 // or instance variable initializer expressions of that
3643 // type. It is a compile-time error for the constructors,
3644 // instance initializer blocks, or instance variable
3645 // initializer expressions of an enum constant e to refer
3646 // to itself or to an enum constant of the same type that
3647 // is declared to the right of e."
3648 if (isStaticEnumField(v)) {
3649 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3651 if (enclClass == null || enclClass.owner == null)
3652 return;
3654 // See if the enclosing class is the enum (or a
3655 // subclass thereof) declaring v. If not, this
3656 // reference is OK.
3657 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3658 return;
3660 // If the reference isn't from an initializer, then
3661 // the reference is OK.
3662 if (!Resolve.isInitializer(env))
3663 return;
3665 log.error(tree.pos(), "illegal.enum.static.ref");
3666 }
3667 }
3669 /** Is the given symbol a static, non-constant field of an Enum?
3670 * Note: enum literals should not be regarded as such
3671 */
3672 private boolean isStaticEnumField(VarSymbol v) {
3673 return Flags.isEnum(v.owner) &&
3674 Flags.isStatic(v) &&
3675 !Flags.isConstant(v) &&
3676 v.name != names._class;
3677 }
3679 /** Can the given symbol be the owner of code which forms part
3680 * if class initialization? This is the case if the symbol is
3681 * a type or field, or if the symbol is the synthetic method.
3682 * owning a block.
3683 */
3684 private boolean canOwnInitializer(Symbol sym) {
3685 return
3686 (sym.kind & (VAR | TYP)) != 0 ||
3687 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3688 }
3690 Warner noteWarner = new Warner();
3692 /**
3693 * Check that method arguments conform to its instantiation.
3694 **/
3695 public Type checkMethod(Type site,
3696 Symbol sym,
3697 ResultInfo resultInfo,
3698 Env<AttrContext> env,
3699 final List<JCExpression> argtrees,
3700 List<Type> argtypes,
3701 List<Type> typeargtypes) {
3702 // Test (5): if symbol is an instance method of a raw type, issue
3703 // an unchecked warning if its argument types change under erasure.
3704 if (allowGenerics &&
3705 (sym.flags() & STATIC) == 0 &&
3706 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3707 Type s = types.asOuterSuper(site, sym.owner);
3708 if (s != null && s.isRaw() &&
3709 !types.isSameTypes(sym.type.getParameterTypes(),
3710 sym.erasure(types).getParameterTypes())) {
3711 chk.warnUnchecked(env.tree.pos(),
3712 "unchecked.call.mbr.of.raw.type",
3713 sym, s);
3714 }
3715 }
3717 if (env.info.defaultSuperCallSite != null) {
3718 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3719 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3720 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3721 List<MethodSymbol> icand_sup =
3722 types.interfaceCandidates(sup, (MethodSymbol)sym);
3723 if (icand_sup.nonEmpty() &&
3724 icand_sup.head != sym &&
3725 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3726 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3727 diags.fragment("overridden.default", sym, sup));
3728 break;
3729 }
3730 }
3731 env.info.defaultSuperCallSite = null;
3732 }
3734 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3735 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3736 if (app.meth.hasTag(SELECT) &&
3737 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3738 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3739 }
3740 }
3742 // Compute the identifier's instantiated type.
3743 // For methods, we need to compute the instance type by
3744 // Resolve.instantiate from the symbol's type as well as
3745 // any type arguments and value arguments.
3746 noteWarner.clear();
3747 try {
3748 Type owntype = rs.checkMethod(
3749 env,
3750 site,
3751 sym,
3752 resultInfo,
3753 argtypes,
3754 typeargtypes,
3755 noteWarner);
3757 DeferredAttr.DeferredTypeMap checkDeferredMap =
3758 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3760 argtypes = Type.map(argtypes, checkDeferredMap);
3762 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3763 chk.warnUnchecked(env.tree.pos(),
3764 "unchecked.meth.invocation.applied",
3765 kindName(sym),
3766 sym.name,
3767 rs.methodArguments(sym.type.getParameterTypes()),
3768 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3769 kindName(sym.location()),
3770 sym.location());
3771 owntype = new MethodType(owntype.getParameterTypes(),
3772 types.erasure(owntype.getReturnType()),
3773 types.erasure(owntype.getThrownTypes()),
3774 syms.methodClass);
3775 }
3777 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3778 resultInfo.checkContext.inferenceContext());
3779 } catch (Infer.InferenceException ex) {
3780 //invalid target type - propagate exception outwards or report error
3781 //depending on the current check context
3782 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3783 return types.createErrorType(site);
3784 } catch (Resolve.InapplicableMethodException ex) {
3785 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3786 return null;
3787 }
3788 }
3790 public void visitLiteral(JCLiteral tree) {
3791 result = check(
3792 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3793 }
3794 //where
3795 /** Return the type of a literal with given type tag.
3796 */
3797 Type litType(TypeTag tag) {
3798 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3799 }
3801 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3802 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3803 }
3805 public void visitTypeArray(JCArrayTypeTree tree) {
3806 Type etype = attribType(tree.elemtype, env);
3807 Type type = new ArrayType(etype, syms.arrayClass);
3808 result = check(tree, type, TYP, resultInfo);
3809 }
3811 /** Visitor method for parameterized types.
3812 * Bound checking is left until later, since types are attributed
3813 * before supertype structure is completely known
3814 */
3815 public void visitTypeApply(JCTypeApply tree) {
3816 Type owntype = types.createErrorType(tree.type);
3818 // Attribute functor part of application and make sure it's a class.
3819 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3821 // Attribute type parameters
3822 List<Type> actuals = attribTypes(tree.arguments, env);
3824 if (clazztype.hasTag(CLASS)) {
3825 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3826 if (actuals.isEmpty()) //diamond
3827 actuals = formals;
3829 if (actuals.length() == formals.length()) {
3830 List<Type> a = actuals;
3831 List<Type> f = formals;
3832 while (a.nonEmpty()) {
3833 a.head = a.head.withTypeVar(f.head);
3834 a = a.tail;
3835 f = f.tail;
3836 }
3837 // Compute the proper generic outer
3838 Type clazzOuter = clazztype.getEnclosingType();
3839 if (clazzOuter.hasTag(CLASS)) {
3840 Type site;
3841 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3842 if (clazz.hasTag(IDENT)) {
3843 site = env.enclClass.sym.type;
3844 } else if (clazz.hasTag(SELECT)) {
3845 site = ((JCFieldAccess) clazz).selected.type;
3846 } else throw new AssertionError(""+tree);
3847 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3848 if (site.hasTag(CLASS))
3849 site = types.asOuterSuper(site, clazzOuter.tsym);
3850 if (site == null)
3851 site = types.erasure(clazzOuter);
3852 clazzOuter = site;
3853 }
3854 }
3855 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3856 if (clazztype.isAnnotated()) {
3857 // Use the same AnnotatedType, because it will have
3858 // its annotations set later.
3859 ((AnnotatedType)clazztype).underlyingType = owntype;
3860 owntype = clazztype;
3861 }
3862 } else {
3863 if (formals.length() != 0) {
3864 log.error(tree.pos(), "wrong.number.type.args",
3865 Integer.toString(formals.length()));
3866 } else {
3867 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3868 }
3869 owntype = types.createErrorType(tree.type);
3870 }
3871 }
3872 result = check(tree, owntype, TYP, resultInfo);
3873 }
3875 public void visitTypeUnion(JCTypeUnion tree) {
3876 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3877 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3878 for (JCExpression typeTree : tree.alternatives) {
3879 Type ctype = attribType(typeTree, env);
3880 ctype = chk.checkType(typeTree.pos(),
3881 chk.checkClassType(typeTree.pos(), ctype),
3882 syms.throwableType);
3883 if (!ctype.isErroneous()) {
3884 //check that alternatives of a union type are pairwise
3885 //unrelated w.r.t. subtyping
3886 if (chk.intersects(ctype, multicatchTypes.toList())) {
3887 for (Type t : multicatchTypes) {
3888 boolean sub = types.isSubtype(ctype, t);
3889 boolean sup = types.isSubtype(t, ctype);
3890 if (sub || sup) {
3891 //assume 'a' <: 'b'
3892 Type a = sub ? ctype : t;
3893 Type b = sub ? t : ctype;
3894 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3895 }
3896 }
3897 }
3898 multicatchTypes.append(ctype);
3899 if (all_multicatchTypes != null)
3900 all_multicatchTypes.append(ctype);
3901 } else {
3902 if (all_multicatchTypes == null) {
3903 all_multicatchTypes = ListBuffer.lb();
3904 all_multicatchTypes.appendList(multicatchTypes);
3905 }
3906 all_multicatchTypes.append(ctype);
3907 }
3908 }
3909 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3910 if (t.hasTag(CLASS)) {
3911 List<Type> alternatives =
3912 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3913 t = new UnionClassType((ClassType) t, alternatives);
3914 }
3915 tree.type = result = t;
3916 }
3918 public void visitTypeIntersection(JCTypeIntersection tree) {
3919 attribTypes(tree.bounds, env);
3920 tree.type = result = checkIntersection(tree, tree.bounds);
3921 }
3923 public void visitTypeParameter(JCTypeParameter tree) {
3924 TypeVar typeVar = (TypeVar) tree.type;
3926 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3927 AnnotatedType antype = new AnnotatedType(typeVar);
3928 annotateType(antype, tree.annotations);
3929 tree.type = antype;
3930 }
3932 if (!typeVar.bound.isErroneous()) {
3933 //fixup type-parameter bound computed in 'attribTypeVariables'
3934 typeVar.bound = checkIntersection(tree, tree.bounds);
3935 }
3936 }
3938 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3939 Set<Type> boundSet = new HashSet<Type>();
3940 if (bounds.nonEmpty()) {
3941 // accept class or interface or typevar as first bound.
3942 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3943 boundSet.add(types.erasure(bounds.head.type));
3944 if (bounds.head.type.isErroneous()) {
3945 return bounds.head.type;
3946 }
3947 else if (bounds.head.type.hasTag(TYPEVAR)) {
3948 // if first bound was a typevar, do not accept further bounds.
3949 if (bounds.tail.nonEmpty()) {
3950 log.error(bounds.tail.head.pos(),
3951 "type.var.may.not.be.followed.by.other.bounds");
3952 return bounds.head.type;
3953 }
3954 } else {
3955 // if first bound was a class or interface, accept only interfaces
3956 // as further bounds.
3957 for (JCExpression bound : bounds.tail) {
3958 bound.type = checkBase(bound.type, bound, env, false, true, false);
3959 if (bound.type.isErroneous()) {
3960 bounds = List.of(bound);
3961 }
3962 else if (bound.type.hasTag(CLASS)) {
3963 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3964 }
3965 }
3966 }
3967 }
3969 if (bounds.length() == 0) {
3970 return syms.objectType;
3971 } else if (bounds.length() == 1) {
3972 return bounds.head.type;
3973 } else {
3974 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3975 if (tree.hasTag(TYPEINTERSECTION)) {
3976 ((IntersectionClassType)owntype).intersectionKind =
3977 IntersectionClassType.IntersectionKind.EXPLICIT;
3978 }
3979 // ... the variable's bound is a class type flagged COMPOUND
3980 // (see comment for TypeVar.bound).
3981 // In this case, generate a class tree that represents the
3982 // bound class, ...
3983 JCExpression extending;
3984 List<JCExpression> implementing;
3985 if (!bounds.head.type.isInterface()) {
3986 extending = bounds.head;
3987 implementing = bounds.tail;
3988 } else {
3989 extending = null;
3990 implementing = bounds;
3991 }
3992 JCClassDecl cd = make.at(tree).ClassDef(
3993 make.Modifiers(PUBLIC | ABSTRACT),
3994 names.empty, List.<JCTypeParameter>nil(),
3995 extending, implementing, List.<JCTree>nil());
3997 ClassSymbol c = (ClassSymbol)owntype.tsym;
3998 Assert.check((c.flags() & COMPOUND) != 0);
3999 cd.sym = c;
4000 c.sourcefile = env.toplevel.sourcefile;
4002 // ... and attribute the bound class
4003 c.flags_field |= UNATTRIBUTED;
4004 Env<AttrContext> cenv = enter.classEnv(cd, env);
4005 enter.typeEnvs.put(c, cenv);
4006 attribClass(c);
4007 return owntype;
4008 }
4009 }
4011 public void visitWildcard(JCWildcard tree) {
4012 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4013 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4014 ? syms.objectType
4015 : attribType(tree.inner, env);
4016 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4017 tree.kind.kind,
4018 syms.boundClass),
4019 TYP, resultInfo);
4020 }
4022 public void visitAnnotation(JCAnnotation tree) {
4023 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
4024 result = tree.type = syms.errType;
4025 }
4027 public void visitAnnotatedType(JCAnnotatedType tree) {
4028 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4029 this.attribAnnotationTypes(tree.annotations, env);
4030 AnnotatedType antype = new AnnotatedType(underlyingType);
4031 annotateType(antype, tree.annotations);
4032 result = tree.type = antype;
4033 }
4035 /**
4036 * Apply the annotations to the particular type.
4037 */
4038 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
4039 if (annotations.isEmpty())
4040 return;
4041 annotate.typeAnnotation(new Annotate.Annotator() {
4042 @Override
4043 public String toString() {
4044 return "annotate " + annotations + " onto " + type;
4045 }
4046 @Override
4047 public void enterAnnotation() {
4048 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4049 type.typeAnnotations = compounds;
4050 }
4051 });
4052 }
4054 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4055 if (annotations.isEmpty())
4056 return List.nil();
4058 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
4059 for (JCAnnotation anno : annotations) {
4060 if (anno.attribute != null) {
4061 // TODO: this null-check is only needed for an obscure
4062 // ordering issue, where annotate.flush is called when
4063 // the attribute is not set yet. For an example failure
4064 // try the referenceinfos/NestedTypes.java test.
4065 // Any better solutions?
4066 buf.append((Attribute.TypeCompound) anno.attribute);
4067 }
4068 }
4069 return buf.toList();
4070 }
4072 public void visitErroneous(JCErroneous tree) {
4073 if (tree.errs != null)
4074 for (JCTree err : tree.errs)
4075 attribTree(err, env, new ResultInfo(ERR, pt()));
4076 result = tree.type = syms.errType;
4077 }
4079 /** Default visitor method for all other trees.
4080 */
4081 public void visitTree(JCTree tree) {
4082 throw new AssertionError();
4083 }
4085 /**
4086 * Attribute an env for either a top level tree or class declaration.
4087 */
4088 public void attrib(Env<AttrContext> env) {
4089 if (env.tree.hasTag(TOPLEVEL))
4090 attribTopLevel(env);
4091 else
4092 attribClass(env.tree.pos(), env.enclClass.sym);
4093 }
4095 /**
4096 * Attribute a top level tree. These trees are encountered when the
4097 * package declaration has annotations.
4098 */
4099 public void attribTopLevel(Env<AttrContext> env) {
4100 JCCompilationUnit toplevel = env.toplevel;
4101 try {
4102 annotate.flush();
4103 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
4104 } catch (CompletionFailure ex) {
4105 chk.completionError(toplevel.pos(), ex);
4106 }
4107 }
4109 /** Main method: attribute class definition associated with given class symbol.
4110 * reporting completion failures at the given position.
4111 * @param pos The source position at which completion errors are to be
4112 * reported.
4113 * @param c The class symbol whose definition will be attributed.
4114 */
4115 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4116 try {
4117 annotate.flush();
4118 attribClass(c);
4119 } catch (CompletionFailure ex) {
4120 chk.completionError(pos, ex);
4121 }
4122 }
4124 /** Attribute class definition associated with given class symbol.
4125 * @param c The class symbol whose definition will be attributed.
4126 */
4127 void attribClass(ClassSymbol c) throws CompletionFailure {
4128 if (c.type.hasTag(ERROR)) return;
4130 // Check for cycles in the inheritance graph, which can arise from
4131 // ill-formed class files.
4132 chk.checkNonCyclic(null, c.type);
4134 Type st = types.supertype(c.type);
4135 if ((c.flags_field & Flags.COMPOUND) == 0) {
4136 // First, attribute superclass.
4137 if (st.hasTag(CLASS))
4138 attribClass((ClassSymbol)st.tsym);
4140 // Next attribute owner, if it is a class.
4141 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4142 attribClass((ClassSymbol)c.owner);
4143 }
4145 // The previous operations might have attributed the current class
4146 // if there was a cycle. So we test first whether the class is still
4147 // UNATTRIBUTED.
4148 if ((c.flags_field & UNATTRIBUTED) != 0) {
4149 c.flags_field &= ~UNATTRIBUTED;
4151 // Get environment current at the point of class definition.
4152 Env<AttrContext> env = enter.typeEnvs.get(c);
4154 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4155 // because the annotations were not available at the time the env was created. Therefore,
4156 // we look up the environment chain for the first enclosing environment for which the
4157 // lint value is set. Typically, this is the parent env, but might be further if there
4158 // are any envs created as a result of TypeParameter nodes.
4159 Env<AttrContext> lintEnv = env;
4160 while (lintEnv.info.lint == null)
4161 lintEnv = lintEnv.next;
4163 // Having found the enclosing lint value, we can initialize the lint value for this class
4164 env.info.lint = lintEnv.info.lint.augment(c);
4166 Lint prevLint = chk.setLint(env.info.lint);
4167 JavaFileObject prev = log.useSource(c.sourcefile);
4168 ResultInfo prevReturnRes = env.info.returnResult;
4170 try {
4171 env.info.returnResult = null;
4172 // java.lang.Enum may not be subclassed by a non-enum
4173 if (st.tsym == syms.enumSym &&
4174 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4175 log.error(env.tree.pos(), "enum.no.subclassing");
4177 // Enums may not be extended by source-level classes
4178 if (st.tsym != null &&
4179 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4180 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4181 log.error(env.tree.pos(), "enum.types.not.extensible");
4182 }
4183 attribClassBody(env, c);
4185 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4186 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4187 } finally {
4188 env.info.returnResult = prevReturnRes;
4189 log.useSource(prev);
4190 chk.setLint(prevLint);
4191 }
4193 }
4194 }
4196 public void visitImport(JCImport tree) {
4197 // nothing to do
4198 }
4200 /** Finish the attribution of a class. */
4201 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4202 JCClassDecl tree = (JCClassDecl)env.tree;
4203 Assert.check(c == tree.sym);
4205 // Validate annotations
4206 chk.validateAnnotations(tree.mods.annotations, c);
4208 // Validate type parameters, supertype and interfaces.
4209 attribStats(tree.typarams, env);
4210 if (!c.isAnonymous()) {
4211 //already checked if anonymous
4212 chk.validate(tree.typarams, env);
4213 chk.validate(tree.extending, env);
4214 chk.validate(tree.implementing, env);
4215 }
4217 // If this is a non-abstract class, check that it has no abstract
4218 // methods or unimplemented methods of an implemented interface.
4219 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4220 if (!relax)
4221 chk.checkAllDefined(tree.pos(), c);
4222 }
4224 if ((c.flags() & ANNOTATION) != 0) {
4225 if (tree.implementing.nonEmpty())
4226 log.error(tree.implementing.head.pos(),
4227 "cant.extend.intf.annotation");
4228 if (tree.typarams.nonEmpty())
4229 log.error(tree.typarams.head.pos(),
4230 "intf.annotation.cant.have.type.params");
4232 // If this annotation has a @Repeatable, validate
4233 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4234 if (repeatable != null) {
4235 // get diagnostic position for error reporting
4236 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4237 Assert.checkNonNull(cbPos);
4239 chk.validateRepeatable(c, repeatable, cbPos);
4240 }
4241 } else {
4242 // Check that all extended classes and interfaces
4243 // are compatible (i.e. no two define methods with same arguments
4244 // yet different return types). (JLS 8.4.6.3)
4245 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4246 if (allowDefaultMethods) {
4247 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4248 }
4249 }
4251 // Check that class does not import the same parameterized interface
4252 // with two different argument lists.
4253 chk.checkClassBounds(tree.pos(), c.type);
4255 tree.type = c.type;
4257 for (List<JCTypeParameter> l = tree.typarams;
4258 l.nonEmpty(); l = l.tail) {
4259 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4260 }
4262 // Check that a generic class doesn't extend Throwable
4263 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4264 log.error(tree.extending.pos(), "generic.throwable");
4266 // Check that all methods which implement some
4267 // method conform to the method they implement.
4268 chk.checkImplementations(tree);
4270 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4271 checkAutoCloseable(tree.pos(), env, c.type);
4273 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4274 // Attribute declaration
4275 attribStat(l.head, env);
4276 // Check that declarations in inner classes are not static (JLS 8.1.2)
4277 // Make an exception for static constants.
4278 if (c.owner.kind != PCK &&
4279 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4280 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4281 Symbol sym = null;
4282 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4283 if (sym == null ||
4284 sym.kind != VAR ||
4285 ((VarSymbol) sym).getConstValue() == null)
4286 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4287 }
4288 }
4290 // Check for cycles among non-initial constructors.
4291 chk.checkCyclicConstructors(tree);
4293 // Check for cycles among annotation elements.
4294 chk.checkNonCyclicElements(tree);
4296 // Check for proper use of serialVersionUID
4297 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4298 isSerializable(c) &&
4299 (c.flags() & Flags.ENUM) == 0 &&
4300 (c.flags() & ABSTRACT) == 0) {
4301 checkSerialVersionUID(tree, c);
4302 }
4303 if (allowTypeAnnos) {
4304 // Correctly organize the postions of the type annotations
4305 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4307 // Check type annotations applicability rules
4308 validateTypeAnnotations(tree);
4309 }
4310 }
4311 // where
4312 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4313 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4314 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4315 if (types.isSameType(al.head.annotationType.type, t))
4316 return al.head.pos();
4317 }
4319 return null;
4320 }
4322 /** check if a class is a subtype of Serializable, if that is available. */
4323 private boolean isSerializable(ClassSymbol c) {
4324 try {
4325 syms.serializableType.complete();
4326 }
4327 catch (CompletionFailure e) {
4328 return false;
4329 }
4330 return types.isSubtype(c.type, syms.serializableType);
4331 }
4333 /** Check that an appropriate serialVersionUID member is defined. */
4334 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4336 // check for presence of serialVersionUID
4337 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4338 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4339 if (e.scope == null) {
4340 log.warning(LintCategory.SERIAL,
4341 tree.pos(), "missing.SVUID", c);
4342 return;
4343 }
4345 // check that it is static final
4346 VarSymbol svuid = (VarSymbol)e.sym;
4347 if ((svuid.flags() & (STATIC | FINAL)) !=
4348 (STATIC | FINAL))
4349 log.warning(LintCategory.SERIAL,
4350 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4352 // check that it is long
4353 else if (!svuid.type.hasTag(LONG))
4354 log.warning(LintCategory.SERIAL,
4355 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4357 // check constant
4358 else if (svuid.getConstValue() == null)
4359 log.warning(LintCategory.SERIAL,
4360 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4361 }
4363 private Type capture(Type type) {
4364 //do not capture free types
4365 return resultInfo.checkContext.inferenceContext().free(type) ?
4366 type : types.capture(type);
4367 }
4369 private void validateTypeAnnotations(JCTree tree) {
4370 tree.accept(typeAnnotationsValidator);
4371 }
4372 //where
4373 private final JCTree.Visitor typeAnnotationsValidator = new TreeScanner() {
4375 private boolean checkAllAnnotations = false;
4377 public void visitAnnotation(JCAnnotation tree) {
4378 if (tree.hasTag(TYPE_ANNOTATION) || checkAllAnnotations) {
4379 chk.validateTypeAnnotation(tree, false);
4380 }
4381 super.visitAnnotation(tree);
4382 }
4383 public void visitTypeParameter(JCTypeParameter tree) {
4384 chk.validateTypeAnnotations(tree.annotations, true);
4385 scan(tree.bounds);
4386 // Don't call super.
4387 // This is needed because above we call validateTypeAnnotation with
4388 // false, which would forbid annotations on type parameters.
4389 // super.visitTypeParameter(tree);
4390 }
4391 public void visitMethodDef(JCMethodDecl tree) {
4392 if (tree.recvparam != null &&
4393 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4394 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4395 tree.recvparam.vartype.type.tsym);
4396 }
4397 if (tree.restype != null && tree.restype.type != null) {
4398 validateAnnotatedType(tree.restype, tree.restype.type);
4399 }
4400 super.visitMethodDef(tree);
4401 }
4402 public void visitVarDef(final JCVariableDecl tree) {
4403 if (tree.sym != null && tree.sym.type != null)
4404 validateAnnotatedType(tree, tree.sym.type);
4405 super.visitVarDef(tree);
4406 }
4407 public void visitTypeCast(JCTypeCast tree) {
4408 if (tree.clazz != null && tree.clazz.type != null)
4409 validateAnnotatedType(tree.clazz, tree.clazz.type);
4410 super.visitTypeCast(tree);
4411 }
4412 public void visitTypeTest(JCInstanceOf tree) {
4413 if (tree.clazz != null && tree.clazz.type != null)
4414 validateAnnotatedType(tree.clazz, tree.clazz.type);
4415 super.visitTypeTest(tree);
4416 }
4417 public void visitNewClass(JCNewClass tree) {
4418 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4419 boolean prevCheck = this.checkAllAnnotations;
4420 try {
4421 this.checkAllAnnotations = true;
4422 scan(((JCAnnotatedType)tree.clazz).annotations);
4423 } finally {
4424 this.checkAllAnnotations = prevCheck;
4425 }
4426 }
4427 super.visitNewClass(tree);
4428 }
4429 public void visitNewArray(JCNewArray tree) {
4430 if (tree.elemtype != null && tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4431 boolean prevCheck = this.checkAllAnnotations;
4432 try {
4433 this.checkAllAnnotations = true;
4434 scan(((JCAnnotatedType)tree.elemtype).annotations);
4435 } finally {
4436 this.checkAllAnnotations = prevCheck;
4437 }
4438 }
4439 super.visitNewArray(tree);
4440 }
4442 /* I would want to model this after
4443 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4444 * and override visitSelect and visitTypeApply.
4445 * However, we only set the annotated type in the top-level type
4446 * of the symbol.
4447 * Therefore, we need to override each individual location where a type
4448 * can occur.
4449 */
4450 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4451 if (type.getEnclosingType() != null &&
4452 type != type.getEnclosingType()) {
4453 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4454 }
4455 for (Type targ : type.getTypeArguments()) {
4456 validateAnnotatedType(errtree, targ);
4457 }
4458 }
4459 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4460 validateAnnotatedType(errtree, type);
4461 if (type.tsym != null &&
4462 type.tsym.isStatic() &&
4463 type.getAnnotationMirrors().nonEmpty()) {
4464 // Enclosing static classes cannot have type annotations.
4465 log.error(errtree.pos(), "cant.annotate.static.class");
4466 }
4467 }
4468 };
4470 // <editor-fold desc="post-attribution visitor">
4472 /**
4473 * Handle missing types/symbols in an AST. This routine is useful when
4474 * the compiler has encountered some errors (which might have ended up
4475 * terminating attribution abruptly); if the compiler is used in fail-over
4476 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4477 * prevents NPE to be progagated during subsequent compilation steps.
4478 */
4479 public void postAttr(JCTree tree) {
4480 new PostAttrAnalyzer().scan(tree);
4481 }
4483 class PostAttrAnalyzer extends TreeScanner {
4485 private void initTypeIfNeeded(JCTree that) {
4486 if (that.type == null) {
4487 that.type = syms.unknownType;
4488 }
4489 }
4491 @Override
4492 public void scan(JCTree tree) {
4493 if (tree == null) return;
4494 if (tree instanceof JCExpression) {
4495 initTypeIfNeeded(tree);
4496 }
4497 super.scan(tree);
4498 }
4500 @Override
4501 public void visitIdent(JCIdent that) {
4502 if (that.sym == null) {
4503 that.sym = syms.unknownSymbol;
4504 }
4505 }
4507 @Override
4508 public void visitSelect(JCFieldAccess that) {
4509 if (that.sym == null) {
4510 that.sym = syms.unknownSymbol;
4511 }
4512 super.visitSelect(that);
4513 }
4515 @Override
4516 public void visitClassDef(JCClassDecl that) {
4517 initTypeIfNeeded(that);
4518 if (that.sym == null) {
4519 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4520 }
4521 super.visitClassDef(that);
4522 }
4524 @Override
4525 public void visitMethodDef(JCMethodDecl that) {
4526 initTypeIfNeeded(that);
4527 if (that.sym == null) {
4528 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4529 }
4530 super.visitMethodDef(that);
4531 }
4533 @Override
4534 public void visitVarDef(JCVariableDecl that) {
4535 initTypeIfNeeded(that);
4536 if (that.sym == null) {
4537 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4538 that.sym.adr = 0;
4539 }
4540 super.visitVarDef(that);
4541 }
4543 @Override
4544 public void visitNewClass(JCNewClass that) {
4545 if (that.constructor == null) {
4546 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4547 }
4548 if (that.constructorType == null) {
4549 that.constructorType = syms.unknownType;
4550 }
4551 super.visitNewClass(that);
4552 }
4554 @Override
4555 public void visitAssignop(JCAssignOp that) {
4556 if (that.operator == null)
4557 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4558 super.visitAssignop(that);
4559 }
4561 @Override
4562 public void visitBinary(JCBinary that) {
4563 if (that.operator == null)
4564 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4565 super.visitBinary(that);
4566 }
4568 @Override
4569 public void visitUnary(JCUnary that) {
4570 if (that.operator == null)
4571 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4572 super.visitUnary(that);
4573 }
4575 @Override
4576 public void visitLambda(JCLambda that) {
4577 super.visitLambda(that);
4578 if (that.descriptorType == null) {
4579 that.descriptorType = syms.unknownType;
4580 }
4581 if (that.targets == null) {
4582 that.targets = List.nil();
4583 }
4584 }
4586 @Override
4587 public void visitReference(JCMemberReference that) {
4588 super.visitReference(that);
4589 if (that.sym == null) {
4590 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4591 }
4592 if (that.descriptorType == null) {
4593 that.descriptorType = syms.unknownType;
4594 }
4595 if (that.targets == null) {
4596 that.targets = List.nil();
4597 }
4598 }
4599 }
4600 // </editor-fold>
4601 }
