Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@23fe1a96bc0f
src/share/classes/com/sun/tools/javac/comp/Attr.java
Tue, 30 Oct 2012 10:15:19 -0700
- author
- jjg
- date
- Tue, 30 Oct 2012 10:15:19 -0700
- changeset 1381
- 23fe1a96bc0f
- parent 1374
- c002fdee76fd
- child 1384
- bf54daa9dcd8
- permissions
- -rw-r--r--
8001929: fix doclint errors in langtools doc comments
Reviewed-by: darcy
1 /*
2 * Copyright (c) 1999, 2012, 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.*;
29 import java.util.Set;
31 import javax.lang.model.element.ElementKind;
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.InferenceContext.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.jvm.Target;
49 import com.sun.tools.javac.tree.*;
50 import com.sun.tools.javac.tree.JCTree.*;
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() && options.isSet("allowPoly");
137 allowLambda = source.allowLambda();
138 sourceName = source.name;
139 relax = (options.isSet("-retrofit") ||
140 options.isSet("-relax"));
141 findDiamonds = options.get("findDiamond") != null &&
142 source.allowDiamond();
143 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
144 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
146 statInfo = new ResultInfo(NIL, Type.noType);
147 varInfo = new ResultInfo(VAR, Type.noType);
148 unknownExprInfo = new ResultInfo(VAL, Type.noType);
149 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
150 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
151 }
153 /** Switch: relax some constraints for retrofit mode.
154 */
155 boolean relax;
157 /** Switch: support target-typing inference
158 */
159 boolean allowPoly;
161 /** Switch: support generics?
162 */
163 boolean allowGenerics;
165 /** Switch: allow variable-arity methods.
166 */
167 boolean allowVarargs;
169 /** Switch: support enums?
170 */
171 boolean allowEnums;
173 /** Switch: support boxing and unboxing?
174 */
175 boolean allowBoxing;
177 /** Switch: support covariant result types?
178 */
179 boolean allowCovariantReturns;
181 /** Switch: support lambda expressions ?
182 */
183 boolean allowLambda;
185 /** Switch: allow references to surrounding object from anonymous
186 * objects during constructor call?
187 */
188 boolean allowAnonOuterThis;
190 /** Switch: generates a warning if diamond can be safely applied
191 * to a given new expression
192 */
193 boolean findDiamonds;
195 /**
196 * Internally enables/disables diamond finder feature
197 */
198 static final boolean allowDiamondFinder = true;
200 /**
201 * Switch: warn about use of variable before declaration?
202 * RFE: 6425594
203 */
204 boolean useBeforeDeclarationWarning;
206 /**
207 * Switch: generate warnings whenever an anonymous inner class that is convertible
208 * to a lambda expression is found
209 */
210 boolean identifyLambdaCandidate;
212 /**
213 * Switch: allow strings in switch?
214 */
215 boolean allowStringsInSwitch;
217 /**
218 * Switch: name of source level; used for error reporting.
219 */
220 String sourceName;
222 /** Check kind and type of given tree against protokind and prototype.
223 * If check succeeds, store type in tree and return it.
224 * If check fails, store errType in tree and return it.
225 * No checks are performed if the prototype is a method type.
226 * It is not necessary in this case since we know that kind and type
227 * are correct.
228 *
229 * @param tree The tree whose kind and type is checked
230 * @param ownkind The computed kind of the tree
231 * @param resultInfo The expected result of the tree
232 */
233 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
234 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
235 Type owntype = found;
236 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
237 if (inferenceContext.free(found)) {
238 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
239 @Override
240 public void typesInferred(InferenceContext inferenceContext) {
241 ResultInfo pendingResult =
242 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt, types));
243 check(tree, inferenceContext.asInstType(found, types), ownkind, pendingResult);
244 }
245 });
246 return tree.type = resultInfo.pt;
247 } else {
248 if ((ownkind & ~resultInfo.pkind) == 0) {
249 owntype = resultInfo.check(tree, owntype);
250 } else {
251 log.error(tree.pos(), "unexpected.type",
252 kindNames(resultInfo.pkind),
253 kindName(ownkind));
254 owntype = types.createErrorType(owntype);
255 }
256 }
257 }
258 tree.type = owntype;
259 return owntype;
260 }
262 /** Is given blank final variable assignable, i.e. in a scope where it
263 * may be assigned to even though it is final?
264 * @param v The blank final variable.
265 * @param env The current environment.
266 */
267 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
268 Symbol owner = owner(env);
269 // owner refers to the innermost variable, method or
270 // initializer block declaration at this point.
271 return
272 v.owner == owner
273 ||
274 ((owner.name == names.init || // i.e. we are in a constructor
275 owner.kind == VAR || // i.e. we are in a variable initializer
276 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
277 &&
278 v.owner == owner.owner
279 &&
280 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
281 }
283 /**
284 * Return the innermost enclosing owner symbol in a given attribution context
285 */
286 Symbol owner(Env<AttrContext> env) {
287 while (true) {
288 switch (env.tree.getTag()) {
289 case VARDEF:
290 //a field can be owner
291 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
292 if (vsym.owner.kind == TYP) {
293 return vsym;
294 }
295 break;
296 case METHODDEF:
297 //method def is always an owner
298 return ((JCMethodDecl)env.tree).sym;
299 case CLASSDEF:
300 //class def is always an owner
301 return ((JCClassDecl)env.tree).sym;
302 case LAMBDA:
303 //a lambda is an owner - return a fresh synthetic method symbol
304 return new MethodSymbol(0, names.empty, null, syms.methodClass);
305 case BLOCK:
306 //static/instance init blocks are owner
307 Symbol blockSym = env.info.scope.owner;
308 if ((blockSym.flags() & BLOCK) != 0) {
309 return blockSym;
310 }
311 break;
312 case TOPLEVEL:
313 //toplevel is always an owner (for pkge decls)
314 return env.info.scope.owner;
315 }
316 Assert.checkNonNull(env.next);
317 env = env.next;
318 }
319 }
321 /** Check that variable can be assigned to.
322 * @param pos The current source code position.
323 * @param v The assigned varaible
324 * @param base If the variable is referred to in a Select, the part
325 * to the left of the `.', null otherwise.
326 * @param env The current environment.
327 */
328 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
329 if ((v.flags() & FINAL) != 0 &&
330 ((v.flags() & HASINIT) != 0
331 ||
332 !((base == null ||
333 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
334 isAssignableAsBlankFinal(v, env)))) {
335 if (v.isResourceVariable()) { //TWR resource
336 log.error(pos, "try.resource.may.not.be.assigned", v);
337 } else {
338 log.error(pos, "cant.assign.val.to.final.var", v);
339 }
340 }
341 }
343 /** Does tree represent a static reference to an identifier?
344 * It is assumed that tree is either a SELECT or an IDENT.
345 * We have to weed out selects from non-type names here.
346 * @param tree The candidate tree.
347 */
348 boolean isStaticReference(JCTree tree) {
349 if (tree.hasTag(SELECT)) {
350 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
351 if (lsym == null || lsym.kind != TYP) {
352 return false;
353 }
354 }
355 return true;
356 }
358 /** Is this symbol a type?
359 */
360 static boolean isType(Symbol sym) {
361 return sym != null && sym.kind == TYP;
362 }
364 /** The current `this' symbol.
365 * @param env The current environment.
366 */
367 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
368 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
369 }
371 /** Attribute a parsed identifier.
372 * @param tree Parsed identifier name
373 * @param topLevel The toplevel to use
374 */
375 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
376 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
377 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
378 syms.errSymbol.name,
379 null, null, null, null);
380 localEnv.enclClass.sym = syms.errSymbol;
381 return tree.accept(identAttributer, localEnv);
382 }
383 // where
384 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
385 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
386 @Override
387 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
388 Symbol site = visit(node.getExpression(), env);
389 if (site.kind == ERR)
390 return site;
391 Name name = (Name)node.getIdentifier();
392 if (site.kind == PCK) {
393 env.toplevel.packge = (PackageSymbol)site;
394 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
395 } else {
396 env.enclClass.sym = (ClassSymbol)site;
397 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
398 }
399 }
401 @Override
402 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
403 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
404 }
405 }
407 public Type coerce(Type etype, Type ttype) {
408 return cfolder.coerce(etype, ttype);
409 }
411 public Type attribType(JCTree node, TypeSymbol sym) {
412 Env<AttrContext> env = enter.typeEnvs.get(sym);
413 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
414 return attribTree(node, localEnv, unknownTypeInfo);
415 }
417 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
418 // Attribute qualifying package or class.
419 JCFieldAccess s = (JCFieldAccess)tree.qualid;
420 return attribTree(s.selected,
421 env,
422 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
423 Type.noType));
424 }
426 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
427 breakTree = tree;
428 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
429 try {
430 attribExpr(expr, env);
431 } catch (BreakAttr b) {
432 return b.env;
433 } catch (AssertionError ae) {
434 if (ae.getCause() instanceof BreakAttr) {
435 return ((BreakAttr)(ae.getCause())).env;
436 } else {
437 throw ae;
438 }
439 } finally {
440 breakTree = null;
441 log.useSource(prev);
442 }
443 return env;
444 }
446 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
447 breakTree = tree;
448 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
449 try {
450 attribStat(stmt, env);
451 } catch (BreakAttr b) {
452 return b.env;
453 } catch (AssertionError ae) {
454 if (ae.getCause() instanceof BreakAttr) {
455 return ((BreakAttr)(ae.getCause())).env;
456 } else {
457 throw ae;
458 }
459 } finally {
460 breakTree = null;
461 log.useSource(prev);
462 }
463 return env;
464 }
466 private JCTree breakTree = null;
468 private static class BreakAttr extends RuntimeException {
469 static final long serialVersionUID = -6924771130405446405L;
470 private Env<AttrContext> env;
471 private BreakAttr(Env<AttrContext> env) {
472 this.env = copyEnv(env);
473 }
475 private Env<AttrContext> copyEnv(Env<AttrContext> env) {
476 Env<AttrContext> newEnv =
477 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
478 if (newEnv.outer != null) {
479 newEnv.outer = copyEnv(newEnv.outer);
480 }
481 return newEnv;
482 }
484 private Scope copyScope(Scope sc) {
485 Scope newScope = new Scope(sc.owner);
486 List<Symbol> elemsList = List.nil();
487 while (sc != null) {
488 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
489 elemsList = elemsList.prepend(e.sym);
490 }
491 sc = sc.next;
492 }
493 for (Symbol s : elemsList) {
494 newScope.enter(s);
495 }
496 return newScope;
497 }
498 }
500 class ResultInfo {
501 final int pkind;
502 final Type pt;
503 final CheckContext checkContext;
505 ResultInfo(int pkind, Type pt) {
506 this(pkind, pt, chk.basicHandler);
507 }
509 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
510 this.pkind = pkind;
511 this.pt = pt;
512 this.checkContext = checkContext;
513 }
515 protected Type check(final DiagnosticPosition pos, final Type found) {
516 return chk.checkType(pos, found, pt, checkContext);
517 }
519 protected ResultInfo dup(Type newPt) {
520 return new ResultInfo(pkind, newPt, checkContext);
521 }
522 }
524 class RecoveryInfo extends ResultInfo {
526 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
527 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
528 @Override
529 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
530 return deferredAttrContext;
531 }
532 @Override
533 public boolean compatible(Type found, Type req, Warner warn) {
534 return true;
535 }
536 @Override
537 public void report(DiagnosticPosition pos, JCDiagnostic details) {
538 //do nothing
539 }
540 });
541 }
543 @Override
544 protected Type check(DiagnosticPosition pos, Type found) {
545 return chk.checkNonVoid(pos, super.check(pos, found));
546 }
547 }
549 final ResultInfo statInfo;
550 final ResultInfo varInfo;
551 final ResultInfo unknownExprInfo;
552 final ResultInfo unknownTypeInfo;
553 final ResultInfo recoveryInfo;
555 Type pt() {
556 return resultInfo.pt;
557 }
559 int pkind() {
560 return resultInfo.pkind;
561 }
563 /* ************************************************************************
564 * Visitor methods
565 *************************************************************************/
567 /** Visitor argument: the current environment.
568 */
569 Env<AttrContext> env;
571 /** Visitor argument: the currently expected attribution result.
572 */
573 ResultInfo resultInfo;
575 /** Visitor result: the computed type.
576 */
577 Type result;
579 /** Visitor method: attribute a tree, catching any completion failure
580 * exceptions. Return the tree's type.
581 *
582 * @param tree The tree to be visited.
583 * @param env The environment visitor argument.
584 * @param resultInfo The result info visitor argument.
585 */
586 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
587 Env<AttrContext> prevEnv = this.env;
588 ResultInfo prevResult = this.resultInfo;
589 try {
590 this.env = env;
591 this.resultInfo = resultInfo;
592 tree.accept(this);
593 if (tree == breakTree)
594 throw new BreakAttr(env);
595 return result;
596 } catch (CompletionFailure ex) {
597 tree.type = syms.errType;
598 return chk.completionError(tree.pos(), ex);
599 } finally {
600 this.env = prevEnv;
601 this.resultInfo = prevResult;
602 }
603 }
605 /** Derived visitor method: attribute an expression tree.
606 */
607 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
608 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
609 }
611 /** Derived visitor method: attribute an expression tree with
612 * no constraints on the computed type.
613 */
614 Type attribExpr(JCTree tree, Env<AttrContext> env) {
615 return attribTree(tree, env, unknownExprInfo);
616 }
618 /** Derived visitor method: attribute a type tree.
619 */
620 Type attribType(JCTree tree, Env<AttrContext> env) {
621 Type result = attribType(tree, env, Type.noType);
622 return result;
623 }
625 /** Derived visitor method: attribute a type tree.
626 */
627 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
628 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
629 return result;
630 }
632 /** Derived visitor method: attribute a statement or definition tree.
633 */
634 public Type attribStat(JCTree tree, Env<AttrContext> env) {
635 return attribTree(tree, env, statInfo);
636 }
638 /** Attribute a list of expressions, returning a list of types.
639 */
640 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
641 ListBuffer<Type> ts = new ListBuffer<Type>();
642 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
643 ts.append(attribExpr(l.head, env, pt));
644 return ts.toList();
645 }
647 /** Attribute a list of statements, returning nothing.
648 */
649 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
650 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
651 attribStat(l.head, env);
652 }
654 /** Attribute the arguments in a method call, returning a list of types.
655 */
656 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
657 ListBuffer<Type> argtypes = new ListBuffer<Type>();
658 for (JCExpression arg : trees) {
659 Type argtype = allowPoly && TreeInfo.isPoly(arg, env.tree) ?
660 deferredAttr.new DeferredType(arg, env) :
661 chk.checkNonVoid(arg, attribExpr(arg, env, Infer.anyPoly));
662 argtypes.append(argtype);
663 }
664 return argtypes.toList();
665 }
667 /** Attribute a type argument list, returning a list of types.
668 * Caller is responsible for calling checkRefTypes.
669 */
670 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
671 ListBuffer<Type> argtypes = new ListBuffer<Type>();
672 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
673 argtypes.append(attribType(l.head, env));
674 return argtypes.toList();
675 }
677 /** Attribute a type argument list, returning a list of types.
678 * Check that all the types are references.
679 */
680 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
681 List<Type> types = attribAnyTypes(trees, env);
682 return chk.checkRefTypes(trees, types);
683 }
685 /**
686 * Attribute type variables (of generic classes or methods).
687 * Compound types are attributed later in attribBounds.
688 * @param typarams the type variables to enter
689 * @param env the current environment
690 */
691 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
692 for (JCTypeParameter tvar : typarams) {
693 TypeVar a = (TypeVar)tvar.type;
694 a.tsym.flags_field |= UNATTRIBUTED;
695 a.bound = Type.noType;
696 if (!tvar.bounds.isEmpty()) {
697 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
698 for (JCExpression bound : tvar.bounds.tail)
699 bounds = bounds.prepend(attribType(bound, env));
700 types.setBounds(a, bounds.reverse());
701 } else {
702 // if no bounds are given, assume a single bound of
703 // java.lang.Object.
704 types.setBounds(a, List.of(syms.objectType));
705 }
706 a.tsym.flags_field &= ~UNATTRIBUTED;
707 }
708 for (JCTypeParameter tvar : typarams)
709 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
710 attribStats(typarams, env);
711 }
713 void attribBounds(List<JCTypeParameter> typarams) {
714 for (JCTypeParameter typaram : typarams) {
715 Type bound = typaram.type.getUpperBound();
716 if (bound != null && bound.tsym instanceof ClassSymbol) {
717 ClassSymbol c = (ClassSymbol)bound.tsym;
718 if ((c.flags_field & COMPOUND) != 0) {
719 Assert.check((c.flags_field & UNATTRIBUTED) != 0, c);
720 attribClass(typaram.pos(), c);
721 }
722 }
723 }
724 }
726 /**
727 * Attribute the type references in a list of annotations.
728 */
729 void attribAnnotationTypes(List<JCAnnotation> annotations,
730 Env<AttrContext> env) {
731 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
732 JCAnnotation a = al.head;
733 attribType(a.annotationType, env);
734 }
735 }
737 /**
738 * Attribute a "lazy constant value".
739 * @param env The env for the const value
740 * @param initializer The initializer for the const value
741 * @param type The expected type, or null
742 * @see VarSymbol#setLazyConstValue
743 */
744 public Object attribLazyConstantValue(Env<AttrContext> env,
745 JCTree.JCExpression initializer,
746 Type type) {
748 // in case no lint value has been set up for this env, scan up
749 // env stack looking for smallest enclosing env for which it is set.
750 Env<AttrContext> lintEnv = env;
751 while (lintEnv.info.lint == null)
752 lintEnv = lintEnv.next;
754 // Having found the enclosing lint value, we can initialize the lint value for this class
755 // ... but ...
756 // There's a problem with evaluating annotations in the right order, such that
757 // env.info.enclVar.attributes_field might not yet have been evaluated, and so might be
758 // null. In that case, calling augment will throw an NPE. To avoid this, for now we
759 // revert to the jdk 6 behavior and ignore the (unevaluated) attributes.
760 if (env.info.enclVar.annotations.pendingCompletion()) {
761 env.info.lint = lintEnv.info.lint;
762 } else {
763 env.info.lint = lintEnv.info.lint.augment(env.info.enclVar.annotations,
764 env.info.enclVar.flags());
765 }
767 Lint prevLint = chk.setLint(env.info.lint);
768 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
770 try {
771 Type itype = attribExpr(initializer, env, type);
772 if (itype.constValue() != null)
773 return coerce(itype, type).constValue();
774 else
775 return null;
776 } finally {
777 env.info.lint = prevLint;
778 log.useSource(prevSource);
779 }
780 }
782 /** Attribute type reference in an `extends' or `implements' clause.
783 * Supertypes of anonymous inner classes are usually already attributed.
784 *
785 * @param tree The tree making up the type reference.
786 * @param env The environment current at the reference.
787 * @param classExpected true if only a class is expected here.
788 * @param interfaceExpected true if only an interface is expected here.
789 */
790 Type attribBase(JCTree tree,
791 Env<AttrContext> env,
792 boolean classExpected,
793 boolean interfaceExpected,
794 boolean checkExtensible) {
795 Type t = tree.type != null ?
796 tree.type :
797 attribType(tree, env);
798 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
799 }
800 Type checkBase(Type t,
801 JCTree tree,
802 Env<AttrContext> env,
803 boolean classExpected,
804 boolean interfaceExpected,
805 boolean checkExtensible) {
806 if (t.isErroneous())
807 return t;
808 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
809 // check that type variable is already visible
810 if (t.getUpperBound() == null) {
811 log.error(tree.pos(), "illegal.forward.ref");
812 return types.createErrorType(t);
813 }
814 } else {
815 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
816 }
817 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
818 log.error(tree.pos(), "intf.expected.here");
819 // return errType is necessary since otherwise there might
820 // be undetected cycles which cause attribution to loop
821 return types.createErrorType(t);
822 } else if (checkExtensible &&
823 classExpected &&
824 (t.tsym.flags() & INTERFACE) != 0) {
825 log.error(tree.pos(), "no.intf.expected.here");
826 return types.createErrorType(t);
827 }
828 if (checkExtensible &&
829 ((t.tsym.flags() & FINAL) != 0)) {
830 log.error(tree.pos(),
831 "cant.inherit.from.final", t.tsym);
832 }
833 chk.checkNonCyclic(tree.pos(), t);
834 return t;
835 }
837 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
838 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
839 id.type = env.info.scope.owner.type;
840 id.sym = env.info.scope.owner;
841 return id.type;
842 }
844 public void visitClassDef(JCClassDecl tree) {
845 // Local classes have not been entered yet, so we need to do it now:
846 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
847 enter.classEnter(tree, env);
849 ClassSymbol c = tree.sym;
850 if (c == null) {
851 // exit in case something drastic went wrong during enter.
852 result = null;
853 } else {
854 // make sure class has been completed:
855 c.complete();
857 // If this class appears as an anonymous class
858 // in a superclass constructor call where
859 // no explicit outer instance is given,
860 // disable implicit outer instance from being passed.
861 // (This would be an illegal access to "this before super").
862 if (env.info.isSelfCall &&
863 env.tree.hasTag(NEWCLASS) &&
864 ((JCNewClass) env.tree).encl == null)
865 {
866 c.flags_field |= NOOUTERTHIS;
867 }
868 attribClass(tree.pos(), c);
869 result = tree.type = c.type;
870 }
871 }
873 public void visitMethodDef(JCMethodDecl tree) {
874 MethodSymbol m = tree.sym;
875 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
877 Lint lint = env.info.lint.augment(m.annotations, m.flags());
878 Lint prevLint = chk.setLint(lint);
879 MethodSymbol prevMethod = chk.setMethod(m);
880 try {
881 deferredLintHandler.flush(tree.pos());
882 chk.checkDeprecatedAnnotation(tree.pos(), m);
884 attribBounds(tree.typarams);
886 // If we override any other methods, check that we do so properly.
887 // JLS ???
888 if (m.isStatic()) {
889 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
890 } else {
891 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
892 }
893 chk.checkOverride(tree, m);
895 // Create a new environment with local scope
896 // for attributing the method.
897 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
899 localEnv.info.lint = lint;
901 // Enter all type parameters into the local method scope.
902 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
903 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
905 ClassSymbol owner = env.enclClass.sym;
906 if ((owner.flags() & ANNOTATION) != 0 &&
907 tree.params.nonEmpty())
908 log.error(tree.params.head.pos(),
909 "intf.annotation.members.cant.have.params");
911 // Attribute all value parameters.
912 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
913 attribStat(l.head, localEnv);
914 }
916 chk.checkVarargsMethodDecl(localEnv, tree);
918 // Check that type parameters are well-formed.
919 chk.validate(tree.typarams, localEnv);
921 // Check that result type is well-formed.
922 chk.validate(tree.restype, localEnv);
924 // annotation method checks
925 if ((owner.flags() & ANNOTATION) != 0) {
926 // annotation method cannot have throws clause
927 if (tree.thrown.nonEmpty()) {
928 log.error(tree.thrown.head.pos(),
929 "throws.not.allowed.in.intf.annotation");
930 }
931 // annotation method cannot declare type-parameters
932 if (tree.typarams.nonEmpty()) {
933 log.error(tree.typarams.head.pos(),
934 "intf.annotation.members.cant.have.type.params");
935 }
936 // validate annotation method's return type (could be an annotation type)
937 chk.validateAnnotationType(tree.restype);
938 // ensure that annotation method does not clash with members of Object/Annotation
939 chk.validateAnnotationMethod(tree.pos(), m);
941 if (tree.defaultValue != null) {
942 // if default value is an annotation, check it is a well-formed
943 // annotation value (e.g. no duplicate values, no missing values, etc.)
944 chk.validateAnnotationTree(tree.defaultValue);
945 }
946 }
948 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
949 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
951 if (tree.body == null) {
952 // Empty bodies are only allowed for
953 // abstract, native, or interface methods, or for methods
954 // in a retrofit signature class.
955 if (isDefaultMethod || ((owner.flags() & INTERFACE) == 0 &&
956 (tree.mods.flags & (ABSTRACT | NATIVE)) == 0) &&
957 !relax)
958 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
959 if (tree.defaultValue != null) {
960 if ((owner.flags() & ANNOTATION) == 0)
961 log.error(tree.pos(),
962 "default.allowed.in.intf.annotation.member");
963 }
964 } else if ((owner.flags() & INTERFACE) != 0 && !isDefaultMethod) {
965 log.error(tree.body.pos(), "intf.meth.cant.have.body");
966 } else if ((tree.mods.flags & ABSTRACT) != 0) {
967 log.error(tree.pos(), "abstract.meth.cant.have.body");
968 } else if ((tree.mods.flags & NATIVE) != 0) {
969 log.error(tree.pos(), "native.meth.cant.have.body");
970 } else {
971 // Add an implicit super() call unless an explicit call to
972 // super(...) or this(...) is given
973 // or we are compiling class java.lang.Object.
974 if (tree.name == names.init && owner.type != syms.objectType) {
975 JCBlock body = tree.body;
976 if (body.stats.isEmpty() ||
977 !TreeInfo.isSelfCall(body.stats.head)) {
978 body.stats = body.stats.
979 prepend(memberEnter.SuperCall(make.at(body.pos),
980 List.<Type>nil(),
981 List.<JCVariableDecl>nil(),
982 false));
983 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
984 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
985 TreeInfo.isSuperCall(body.stats.head)) {
986 // enum constructors are not allowed to call super
987 // directly, so make sure there aren't any super calls
988 // in enum constructors, except in the compiler
989 // generated one.
990 log.error(tree.body.stats.head.pos(),
991 "call.to.super.not.allowed.in.enum.ctor",
992 env.enclClass.sym);
993 }
994 }
996 // Attribute method body.
997 attribStat(tree.body, localEnv);
998 }
999 localEnv.info.scope.leave();
1000 result = tree.type = m.type;
1001 chk.validateAnnotations(tree.mods.annotations, m);
1002 }
1003 finally {
1004 chk.setLint(prevLint);
1005 chk.setMethod(prevMethod);
1006 }
1007 }
1009 public void visitVarDef(JCVariableDecl tree) {
1010 // Local variables have not been entered yet, so we need to do it now:
1011 if (env.info.scope.owner.kind == MTH) {
1012 if (tree.sym != null) {
1013 // parameters have already been entered
1014 env.info.scope.enter(tree.sym);
1015 } else {
1016 memberEnter.memberEnter(tree, env);
1017 annotate.flush();
1018 }
1019 }
1021 VarSymbol v = tree.sym;
1022 Lint lint = env.info.lint.augment(v.annotations, v.flags());
1023 Lint prevLint = chk.setLint(lint);
1025 // Check that the variable's declared type is well-formed.
1026 chk.validate(tree.vartype, env);
1027 deferredLintHandler.flush(tree.pos());
1029 try {
1030 chk.checkDeprecatedAnnotation(tree.pos(), v);
1032 if (tree.init != null) {
1033 if ((v.flags_field & FINAL) != 0 &&
1034 !tree.init.hasTag(NEWCLASS) &&
1035 !tree.init.hasTag(LAMBDA) &&
1036 !tree.init.hasTag(REFERENCE)) {
1037 // In this case, `v' is final. Ensure that it's initializer is
1038 // evaluated.
1039 v.getConstValue(); // ensure initializer is evaluated
1040 } else {
1041 // Attribute initializer in a new environment
1042 // with the declared variable as owner.
1043 // Check that initializer conforms to variable's declared type.
1044 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1045 initEnv.info.lint = lint;
1046 // In order to catch self-references, we set the variable's
1047 // declaration position to maximal possible value, effectively
1048 // marking the variable as undefined.
1049 initEnv.info.enclVar = v;
1050 attribExpr(tree.init, initEnv, v.type);
1051 }
1052 }
1053 result = tree.type = v.type;
1054 chk.validateAnnotations(tree.mods.annotations, v);
1055 }
1056 finally {
1057 chk.setLint(prevLint);
1058 }
1059 }
1061 public void visitSkip(JCSkip tree) {
1062 result = null;
1063 }
1065 public void visitBlock(JCBlock tree) {
1066 if (env.info.scope.owner.kind == TYP) {
1067 // Block is a static or instance initializer;
1068 // let the owner of the environment be a freshly
1069 // created BLOCK-method.
1070 Env<AttrContext> localEnv =
1071 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1072 localEnv.info.scope.owner =
1073 new MethodSymbol(tree.flags | BLOCK, names.empty, null,
1074 env.info.scope.owner);
1075 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1076 attribStats(tree.stats, localEnv);
1077 } else {
1078 // Create a new local environment with a local scope.
1079 Env<AttrContext> localEnv =
1080 env.dup(tree, env.info.dup(env.info.scope.dup()));
1081 try {
1082 attribStats(tree.stats, localEnv);
1083 } finally {
1084 localEnv.info.scope.leave();
1085 }
1086 }
1087 result = null;
1088 }
1090 public void visitDoLoop(JCDoWhileLoop tree) {
1091 attribStat(tree.body, env.dup(tree));
1092 attribExpr(tree.cond, env, syms.booleanType);
1093 result = null;
1094 }
1096 public void visitWhileLoop(JCWhileLoop tree) {
1097 attribExpr(tree.cond, env, syms.booleanType);
1098 attribStat(tree.body, env.dup(tree));
1099 result = null;
1100 }
1102 public void visitForLoop(JCForLoop tree) {
1103 Env<AttrContext> loopEnv =
1104 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1105 try {
1106 attribStats(tree.init, loopEnv);
1107 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1108 loopEnv.tree = tree; // before, we were not in loop!
1109 attribStats(tree.step, loopEnv);
1110 attribStat(tree.body, loopEnv);
1111 result = null;
1112 }
1113 finally {
1114 loopEnv.info.scope.leave();
1115 }
1116 }
1118 public void visitForeachLoop(JCEnhancedForLoop tree) {
1119 Env<AttrContext> loopEnv =
1120 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1121 try {
1122 attribStat(tree.var, loopEnv);
1123 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1124 chk.checkNonVoid(tree.pos(), exprType);
1125 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1126 if (elemtype == null) {
1127 // or perhaps expr implements Iterable<T>?
1128 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1129 if (base == null) {
1130 log.error(tree.expr.pos(),
1131 "foreach.not.applicable.to.type",
1132 exprType,
1133 diags.fragment("type.req.array.or.iterable"));
1134 elemtype = types.createErrorType(exprType);
1135 } else {
1136 List<Type> iterableParams = base.allparams();
1137 elemtype = iterableParams.isEmpty()
1138 ? syms.objectType
1139 : types.upperBound(iterableParams.head);
1140 }
1141 }
1142 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1143 loopEnv.tree = tree; // before, we were not in loop!
1144 attribStat(tree.body, loopEnv);
1145 result = null;
1146 }
1147 finally {
1148 loopEnv.info.scope.leave();
1149 }
1150 }
1152 public void visitLabelled(JCLabeledStatement tree) {
1153 // Check that label is not used in an enclosing statement
1154 Env<AttrContext> env1 = env;
1155 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1156 if (env1.tree.hasTag(LABELLED) &&
1157 ((JCLabeledStatement) env1.tree).label == tree.label) {
1158 log.error(tree.pos(), "label.already.in.use",
1159 tree.label);
1160 break;
1161 }
1162 env1 = env1.next;
1163 }
1165 attribStat(tree.body, env.dup(tree));
1166 result = null;
1167 }
1169 public void visitSwitch(JCSwitch tree) {
1170 Type seltype = attribExpr(tree.selector, env);
1172 Env<AttrContext> switchEnv =
1173 env.dup(tree, env.info.dup(env.info.scope.dup()));
1175 try {
1177 boolean enumSwitch =
1178 allowEnums &&
1179 (seltype.tsym.flags() & Flags.ENUM) != 0;
1180 boolean stringSwitch = false;
1181 if (types.isSameType(seltype, syms.stringType)) {
1182 if (allowStringsInSwitch) {
1183 stringSwitch = true;
1184 } else {
1185 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1186 }
1187 }
1188 if (!enumSwitch && !stringSwitch)
1189 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1191 // Attribute all cases and
1192 // check that there are no duplicate case labels or default clauses.
1193 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1194 boolean hasDefault = false; // Is there a default label?
1195 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1196 JCCase c = l.head;
1197 Env<AttrContext> caseEnv =
1198 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1199 try {
1200 if (c.pat != null) {
1201 if (enumSwitch) {
1202 Symbol sym = enumConstant(c.pat, seltype);
1203 if (sym == null) {
1204 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1205 } else if (!labels.add(sym)) {
1206 log.error(c.pos(), "duplicate.case.label");
1207 }
1208 } else {
1209 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1210 if (!pattype.hasTag(ERROR)) {
1211 if (pattype.constValue() == null) {
1212 log.error(c.pat.pos(),
1213 (stringSwitch ? "string.const.req" : "const.expr.req"));
1214 } else if (labels.contains(pattype.constValue())) {
1215 log.error(c.pos(), "duplicate.case.label");
1216 } else {
1217 labels.add(pattype.constValue());
1218 }
1219 }
1220 }
1221 } else if (hasDefault) {
1222 log.error(c.pos(), "duplicate.default.label");
1223 } else {
1224 hasDefault = true;
1225 }
1226 attribStats(c.stats, caseEnv);
1227 } finally {
1228 caseEnv.info.scope.leave();
1229 addVars(c.stats, switchEnv.info.scope);
1230 }
1231 }
1233 result = null;
1234 }
1235 finally {
1236 switchEnv.info.scope.leave();
1237 }
1238 }
1239 // where
1240 /** Add any variables defined in stats to the switch scope. */
1241 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1242 for (;stats.nonEmpty(); stats = stats.tail) {
1243 JCTree stat = stats.head;
1244 if (stat.hasTag(VARDEF))
1245 switchScope.enter(((JCVariableDecl) stat).sym);
1246 }
1247 }
1248 // where
1249 /** Return the selected enumeration constant symbol, or null. */
1250 private Symbol enumConstant(JCTree tree, Type enumType) {
1251 if (!tree.hasTag(IDENT)) {
1252 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1253 return syms.errSymbol;
1254 }
1255 JCIdent ident = (JCIdent)tree;
1256 Name name = ident.name;
1257 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1258 e.scope != null; e = e.next()) {
1259 if (e.sym.kind == VAR) {
1260 Symbol s = ident.sym = e.sym;
1261 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1262 ident.type = s.type;
1263 return ((s.flags_field & Flags.ENUM) == 0)
1264 ? null : s;
1265 }
1266 }
1267 return null;
1268 }
1270 public void visitSynchronized(JCSynchronized tree) {
1271 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1272 attribStat(tree.body, env);
1273 result = null;
1274 }
1276 public void visitTry(JCTry tree) {
1277 // Create a new local environment with a local
1278 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1279 try {
1280 boolean isTryWithResource = tree.resources.nonEmpty();
1281 // Create a nested environment for attributing the try block if needed
1282 Env<AttrContext> tryEnv = isTryWithResource ?
1283 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1284 localEnv;
1285 try {
1286 // Attribute resource declarations
1287 for (JCTree resource : tree.resources) {
1288 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1289 @Override
1290 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1291 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1292 }
1293 };
1294 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1295 if (resource.hasTag(VARDEF)) {
1296 attribStat(resource, tryEnv);
1297 twrResult.check(resource, resource.type);
1299 //check that resource type cannot throw InterruptedException
1300 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1302 VarSymbol var = (VarSymbol)TreeInfo.symbolFor(resource);
1303 var.setData(ElementKind.RESOURCE_VARIABLE);
1304 } else {
1305 attribTree(resource, tryEnv, twrResult);
1306 }
1307 }
1308 // Attribute body
1309 attribStat(tree.body, tryEnv);
1310 } finally {
1311 if (isTryWithResource)
1312 tryEnv.info.scope.leave();
1313 }
1315 // Attribute catch clauses
1316 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1317 JCCatch c = l.head;
1318 Env<AttrContext> catchEnv =
1319 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1320 try {
1321 Type ctype = attribStat(c.param, catchEnv);
1322 if (TreeInfo.isMultiCatch(c)) {
1323 //multi-catch parameter is implicitly marked as final
1324 c.param.sym.flags_field |= FINAL | UNION;
1325 }
1326 if (c.param.sym.kind == Kinds.VAR) {
1327 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1328 }
1329 chk.checkType(c.param.vartype.pos(),
1330 chk.checkClassType(c.param.vartype.pos(), ctype),
1331 syms.throwableType);
1332 attribStat(c.body, catchEnv);
1333 } finally {
1334 catchEnv.info.scope.leave();
1335 }
1336 }
1338 // Attribute finalizer
1339 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1340 result = null;
1341 }
1342 finally {
1343 localEnv.info.scope.leave();
1344 }
1345 }
1347 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1348 if (!resource.isErroneous() &&
1349 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1350 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1351 Symbol close = syms.noSymbol;
1352 Filter<JCDiagnostic> prevDeferDiagsFilter = log.deferredDiagFilter;
1353 Queue<JCDiagnostic> prevDeferredDiags = log.deferredDiagnostics;
1354 try {
1355 log.deferAll();
1356 log.deferredDiagnostics = ListBuffer.lb();
1357 close = rs.resolveQualifiedMethod(pos,
1358 env,
1359 resource,
1360 names.close,
1361 List.<Type>nil(),
1362 List.<Type>nil());
1363 }
1364 finally {
1365 log.deferredDiagFilter = prevDeferDiagsFilter;
1366 log.deferredDiagnostics = prevDeferredDiags;
1367 }
1368 if (close.kind == MTH &&
1369 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1370 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1371 env.info.lint.isEnabled(LintCategory.TRY)) {
1372 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1373 }
1374 }
1375 }
1377 public void visitConditional(JCConditional tree) {
1378 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1380 boolean standaloneConditional = !allowPoly ||
1381 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1382 isBooleanOrNumeric(env, tree);
1384 if (!standaloneConditional && resultInfo.pt.hasTag(VOID)) {
1385 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1386 result = tree.type = types.createErrorType(resultInfo.pt);
1387 return;
1388 }
1390 ResultInfo condInfo = standaloneConditional ?
1391 unknownExprInfo :
1392 new ResultInfo(VAL, pt(), new Check.NestedCheckContext(resultInfo.checkContext) {
1393 //this will use enclosing check context to check compatibility of
1394 //subexpression against target type; if we are in a method check context,
1395 //depending on whether boxing is allowed, we could have incompatibilities
1396 @Override
1397 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1398 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1399 }
1400 });
1402 Type truetype = attribTree(tree.truepart, env, condInfo);
1403 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1405 Type owntype = standaloneConditional ? condType(tree, truetype, falsetype) : pt();
1406 if (condtype.constValue() != null &&
1407 truetype.constValue() != null &&
1408 falsetype.constValue() != null) {
1409 //constant folding
1410 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1411 }
1412 result = check(tree, owntype, VAL, resultInfo);
1413 }
1414 //where
1415 @SuppressWarnings("fallthrough")
1416 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1417 switch (tree.getTag()) {
1418 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1419 ((JCLiteral)tree).typetag == BOOLEAN;
1420 case LAMBDA: case REFERENCE: return false;
1421 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1422 case CONDEXPR:
1423 JCConditional condTree = (JCConditional)tree;
1424 return isBooleanOrNumeric(env, condTree.truepart) &&
1425 isBooleanOrNumeric(env, condTree.falsepart);
1426 default:
1427 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1428 speculativeType = types.unboxedTypeOrType(speculativeType);
1429 return speculativeType.isPrimitive();
1430 }
1431 }
1433 /** Compute the type of a conditional expression, after
1434 * checking that it exists. See JLS 15.25. Does not take into
1435 * account the special case where condition and both arms
1436 * are constants.
1437 *
1438 * @param pos The source position to be used for error
1439 * diagnostics.
1440 * @param thentype The type of the expression's then-part.
1441 * @param elsetype The type of the expression's else-part.
1442 */
1443 private Type condType(DiagnosticPosition pos,
1444 Type thentype, Type elsetype) {
1445 // If same type, that is the result
1446 if (types.isSameType(thentype, elsetype))
1447 return thentype.baseType();
1449 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1450 ? thentype : types.unboxedType(thentype);
1451 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1452 ? elsetype : types.unboxedType(elsetype);
1454 // Otherwise, if both arms can be converted to a numeric
1455 // type, return the least numeric type that fits both arms
1456 // (i.e. return larger of the two, or return int if one
1457 // arm is short, the other is char).
1458 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1459 // If one arm has an integer subrange type (i.e., byte,
1460 // short, or char), and the other is an integer constant
1461 // that fits into the subrange, return the subrange type.
1462 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && elseUnboxed.hasTag(INT) &&
1463 types.isAssignable(elseUnboxed, thenUnboxed))
1464 return thenUnboxed.baseType();
1465 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && thenUnboxed.hasTag(INT) &&
1466 types.isAssignable(thenUnboxed, elseUnboxed))
1467 return elseUnboxed.baseType();
1469 for (TypeTag tag : TypeTag.values()) {
1470 if (tag.ordinal() >= TypeTag.getTypeTagCount()) break;
1471 Type candidate = syms.typeOfTag[tag.ordinal()];
1472 if (candidate != null &&
1473 candidate.isPrimitive() &&
1474 types.isSubtype(thenUnboxed, candidate) &&
1475 types.isSubtype(elseUnboxed, candidate))
1476 return candidate;
1477 }
1478 }
1480 // Those were all the cases that could result in a primitive
1481 if (allowBoxing) {
1482 if (thentype.isPrimitive())
1483 thentype = types.boxedClass(thentype).type;
1484 if (elsetype.isPrimitive())
1485 elsetype = types.boxedClass(elsetype).type;
1486 }
1488 if (types.isSubtype(thentype, elsetype))
1489 return elsetype.baseType();
1490 if (types.isSubtype(elsetype, thentype))
1491 return thentype.baseType();
1493 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1494 log.error(pos, "neither.conditional.subtype",
1495 thentype, elsetype);
1496 return thentype.baseType();
1497 }
1499 // both are known to be reference types. The result is
1500 // lub(thentype,elsetype). This cannot fail, as it will
1501 // always be possible to infer "Object" if nothing better.
1502 return types.lub(thentype.baseType(), elsetype.baseType());
1503 }
1505 public void visitIf(JCIf tree) {
1506 attribExpr(tree.cond, env, syms.booleanType);
1507 attribStat(tree.thenpart, env);
1508 if (tree.elsepart != null)
1509 attribStat(tree.elsepart, env);
1510 chk.checkEmptyIf(tree);
1511 result = null;
1512 }
1514 public void visitExec(JCExpressionStatement tree) {
1515 //a fresh environment is required for 292 inference to work properly ---
1516 //see Infer.instantiatePolymorphicSignatureInstance()
1517 Env<AttrContext> localEnv = env.dup(tree);
1518 attribExpr(tree.expr, localEnv);
1519 result = null;
1520 }
1522 public void visitBreak(JCBreak tree) {
1523 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1524 result = null;
1525 }
1527 public void visitContinue(JCContinue tree) {
1528 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1529 result = null;
1530 }
1531 //where
1532 /** Return the target of a break or continue statement, if it exists,
1533 * report an error if not.
1534 * Note: The target of a labelled break or continue is the
1535 * (non-labelled) statement tree referred to by the label,
1536 * not the tree representing the labelled statement itself.
1537 *
1538 * @param pos The position to be used for error diagnostics
1539 * @param tag The tag of the jump statement. This is either
1540 * Tree.BREAK or Tree.CONTINUE.
1541 * @param label The label of the jump statement, or null if no
1542 * label is given.
1543 * @param env The environment current at the jump statement.
1544 */
1545 private JCTree findJumpTarget(DiagnosticPosition pos,
1546 JCTree.Tag tag,
1547 Name label,
1548 Env<AttrContext> env) {
1549 // Search environments outwards from the point of jump.
1550 Env<AttrContext> env1 = env;
1551 LOOP:
1552 while (env1 != null) {
1553 switch (env1.tree.getTag()) {
1554 case LABELLED:
1555 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1556 if (label == labelled.label) {
1557 // If jump is a continue, check that target is a loop.
1558 if (tag == CONTINUE) {
1559 if (!labelled.body.hasTag(DOLOOP) &&
1560 !labelled.body.hasTag(WHILELOOP) &&
1561 !labelled.body.hasTag(FORLOOP) &&
1562 !labelled.body.hasTag(FOREACHLOOP))
1563 log.error(pos, "not.loop.label", label);
1564 // Found labelled statement target, now go inwards
1565 // to next non-labelled tree.
1566 return TreeInfo.referencedStatement(labelled);
1567 } else {
1568 return labelled;
1569 }
1570 }
1571 break;
1572 case DOLOOP:
1573 case WHILELOOP:
1574 case FORLOOP:
1575 case FOREACHLOOP:
1576 if (label == null) return env1.tree;
1577 break;
1578 case SWITCH:
1579 if (label == null && tag == BREAK) return env1.tree;
1580 break;
1581 case LAMBDA:
1582 case METHODDEF:
1583 case CLASSDEF:
1584 break LOOP;
1585 default:
1586 }
1587 env1 = env1.next;
1588 }
1589 if (label != null)
1590 log.error(pos, "undef.label", label);
1591 else if (tag == CONTINUE)
1592 log.error(pos, "cont.outside.loop");
1593 else
1594 log.error(pos, "break.outside.switch.loop");
1595 return null;
1596 }
1598 public void visitReturn(JCReturn tree) {
1599 // Check that there is an enclosing method which is
1600 // nested within than the enclosing class.
1601 if (env.info.returnResult == null) {
1602 log.error(tree.pos(), "ret.outside.meth");
1603 } else {
1604 // Attribute return expression, if it exists, and check that
1605 // it conforms to result type of enclosing method.
1606 if (tree.expr != null) {
1607 if (env.info.returnResult.pt.hasTag(VOID)) {
1608 log.error(tree.expr.pos(),
1609 "cant.ret.val.from.meth.decl.void");
1610 }
1611 attribTree(tree.expr, env, env.info.returnResult);
1612 } else if (!env.info.returnResult.pt.hasTag(VOID)) {
1613 log.error(tree.pos(), "missing.ret.val");
1614 }
1615 }
1616 result = null;
1617 }
1619 public void visitThrow(JCThrow tree) {
1620 attribExpr(tree.expr, env, syms.throwableType);
1621 result = null;
1622 }
1624 public void visitAssert(JCAssert tree) {
1625 attribExpr(tree.cond, env, syms.booleanType);
1626 if (tree.detail != null) {
1627 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1628 }
1629 result = null;
1630 }
1632 /** Visitor method for method invocations.
1633 * NOTE: The method part of an application will have in its type field
1634 * the return type of the method, not the method's type itself!
1635 */
1636 public void visitApply(JCMethodInvocation tree) {
1637 // The local environment of a method application is
1638 // a new environment nested in the current one.
1639 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1641 // The types of the actual method arguments.
1642 List<Type> argtypes;
1644 // The types of the actual method type arguments.
1645 List<Type> typeargtypes = null;
1647 Name methName = TreeInfo.name(tree.meth);
1649 boolean isConstructorCall =
1650 methName == names._this || methName == names._super;
1652 if (isConstructorCall) {
1653 // We are seeing a ...this(...) or ...super(...) call.
1654 // Check that this is the first statement in a constructor.
1655 if (checkFirstConstructorStat(tree, env)) {
1657 // Record the fact
1658 // that this is a constructor call (using isSelfCall).
1659 localEnv.info.isSelfCall = true;
1661 // Attribute arguments, yielding list of argument types.
1662 argtypes = attribArgs(tree.args, localEnv);
1663 typeargtypes = attribTypes(tree.typeargs, localEnv);
1665 // Variable `site' points to the class in which the called
1666 // constructor is defined.
1667 Type site = env.enclClass.sym.type;
1668 if (methName == names._super) {
1669 if (site == syms.objectType) {
1670 log.error(tree.meth.pos(), "no.superclass", site);
1671 site = types.createErrorType(syms.objectType);
1672 } else {
1673 site = types.supertype(site);
1674 }
1675 }
1677 if (site.hasTag(CLASS)) {
1678 Type encl = site.getEnclosingType();
1679 while (encl != null && encl.hasTag(TYPEVAR))
1680 encl = encl.getUpperBound();
1681 if (encl.hasTag(CLASS)) {
1682 // we are calling a nested class
1684 if (tree.meth.hasTag(SELECT)) {
1685 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1687 // We are seeing a prefixed call, of the form
1688 // <expr>.super(...).
1689 // Check that the prefix expression conforms
1690 // to the outer instance type of the class.
1691 chk.checkRefType(qualifier.pos(),
1692 attribExpr(qualifier, localEnv,
1693 encl));
1694 } else if (methName == names._super) {
1695 // qualifier omitted; check for existence
1696 // of an appropriate implicit qualifier.
1697 rs.resolveImplicitThis(tree.meth.pos(),
1698 localEnv, site, true);
1699 }
1700 } else if (tree.meth.hasTag(SELECT)) {
1701 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1702 site.tsym);
1703 }
1705 // if we're calling a java.lang.Enum constructor,
1706 // prefix the implicit String and int parameters
1707 if (site.tsym == syms.enumSym && allowEnums)
1708 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1710 // Resolve the called constructor under the assumption
1711 // that we are referring to a superclass instance of the
1712 // current instance (JLS ???).
1713 boolean selectSuperPrev = localEnv.info.selectSuper;
1714 localEnv.info.selectSuper = true;
1715 localEnv.info.pendingResolutionPhase = null;
1716 Symbol sym = rs.resolveConstructor(
1717 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1718 localEnv.info.selectSuper = selectSuperPrev;
1720 // Set method symbol to resolved constructor...
1721 TreeInfo.setSymbol(tree.meth, sym);
1723 // ...and check that it is legal in the current context.
1724 // (this will also set the tree's type)
1725 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1726 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1727 }
1728 // Otherwise, `site' is an error type and we do nothing
1729 }
1730 result = tree.type = syms.voidType;
1731 } else {
1732 // Otherwise, we are seeing a regular method call.
1733 // Attribute the arguments, yielding list of argument types, ...
1734 argtypes = attribArgs(tree.args, localEnv);
1735 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1737 // ... and attribute the method using as a prototype a methodtype
1738 // whose formal argument types is exactly the list of actual
1739 // arguments (this will also set the method symbol).
1740 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1741 localEnv.info.pendingResolutionPhase = null;
1742 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(VAL, mpt, resultInfo.checkContext));
1744 // Compute the result type.
1745 Type restype = mtype.getReturnType();
1746 if (restype.hasTag(WILDCARD))
1747 throw new AssertionError(mtype);
1749 Type qualifier = (tree.meth.hasTag(SELECT))
1750 ? ((JCFieldAccess) tree.meth).selected.type
1751 : env.enclClass.sym.type;
1752 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1754 chk.checkRefTypes(tree.typeargs, typeargtypes);
1756 // Check that value of resulting type is admissible in the
1757 // current context. Also, capture the return type
1758 result = check(tree, capture(restype), VAL, resultInfo);
1760 if (localEnv.info.lastResolveVarargs())
1761 Assert.check(result.isErroneous() || tree.varargsElement != null);
1762 }
1763 chk.validate(tree.typeargs, localEnv);
1764 }
1765 //where
1766 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1767 if (allowCovariantReturns &&
1768 methodName == names.clone &&
1769 types.isArray(qualifierType)) {
1770 // as a special case, array.clone() has a result that is
1771 // the same as static type of the array being cloned
1772 return qualifierType;
1773 } else if (allowGenerics &&
1774 methodName == names.getClass &&
1775 argtypes.isEmpty()) {
1776 // as a special case, x.getClass() has type Class<? extends |X|>
1777 return new ClassType(restype.getEnclosingType(),
1778 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1779 BoundKind.EXTENDS,
1780 syms.boundClass)),
1781 restype.tsym);
1782 } else {
1783 return restype;
1784 }
1785 }
1787 /** Check that given application node appears as first statement
1788 * in a constructor call.
1789 * @param tree The application node
1790 * @param env The environment current at the application.
1791 */
1792 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1793 JCMethodDecl enclMethod = env.enclMethod;
1794 if (enclMethod != null && enclMethod.name == names.init) {
1795 JCBlock body = enclMethod.body;
1796 if (body.stats.head.hasTag(EXEC) &&
1797 ((JCExpressionStatement) body.stats.head).expr == tree)
1798 return true;
1799 }
1800 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1801 TreeInfo.name(tree.meth));
1802 return false;
1803 }
1805 /** Obtain a method type with given argument types.
1806 */
1807 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1808 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1809 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1810 }
1812 public void visitNewClass(final JCNewClass tree) {
1813 Type owntype = types.createErrorType(tree.type);
1815 // The local environment of a class creation is
1816 // a new environment nested in the current one.
1817 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1819 // The anonymous inner class definition of the new expression,
1820 // if one is defined by it.
1821 JCClassDecl cdef = tree.def;
1823 // If enclosing class is given, attribute it, and
1824 // complete class name to be fully qualified
1825 JCExpression clazz = tree.clazz; // Class field following new
1826 JCExpression clazzid = // Identifier in class field
1827 (clazz.hasTag(TYPEAPPLY))
1828 ? ((JCTypeApply) clazz).clazz
1829 : clazz;
1831 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1833 if (tree.encl != null) {
1834 // We are seeing a qualified new, of the form
1835 // <expr>.new C <...> (...) ...
1836 // In this case, we let clazz stand for the name of the
1837 // allocated class C prefixed with the type of the qualifier
1838 // expression, so that we can
1839 // resolve it with standard techniques later. I.e., if
1840 // <expr> has type T, then <expr>.new C <...> (...)
1841 // yields a clazz T.C.
1842 Type encltype = chk.checkRefType(tree.encl.pos(),
1843 attribExpr(tree.encl, env));
1844 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1845 ((JCIdent) clazzid).name);
1846 if (clazz.hasTag(TYPEAPPLY))
1847 clazz = make.at(tree.pos).
1848 TypeApply(clazzid1,
1849 ((JCTypeApply) clazz).arguments);
1850 else
1851 clazz = clazzid1;
1852 }
1854 // Attribute clazz expression and store
1855 // symbol + type back into the attributed tree.
1856 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1857 attribIdentAsEnumType(env, (JCIdent)clazz) :
1858 attribType(clazz, env);
1860 clazztype = chk.checkDiamond(tree, clazztype);
1861 chk.validate(clazz, localEnv);
1862 if (tree.encl != null) {
1863 // We have to work in this case to store
1864 // symbol + type back into the attributed tree.
1865 tree.clazz.type = clazztype;
1866 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1867 clazzid.type = ((JCIdent) clazzid).sym.type;
1868 if (!clazztype.isErroneous()) {
1869 if (cdef != null && clazztype.tsym.isInterface()) {
1870 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1871 } else if (clazztype.tsym.isStatic()) {
1872 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1873 }
1874 }
1875 } else if (!clazztype.tsym.isInterface() &&
1876 clazztype.getEnclosingType().hasTag(CLASS)) {
1877 // Check for the existence of an apropos outer instance
1878 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1879 }
1881 // Attribute constructor arguments.
1882 List<Type> argtypes = attribArgs(tree.args, localEnv);
1883 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1885 // If we have made no mistakes in the class type...
1886 if (clazztype.hasTag(CLASS)) {
1887 // Enums may not be instantiated except implicitly
1888 if (allowEnums &&
1889 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1890 (!env.tree.hasTag(VARDEF) ||
1891 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1892 ((JCVariableDecl) env.tree).init != tree))
1893 log.error(tree.pos(), "enum.cant.be.instantiated");
1894 // Check that class is not abstract
1895 if (cdef == null &&
1896 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
1897 log.error(tree.pos(), "abstract.cant.be.instantiated",
1898 clazztype.tsym);
1899 } else if (cdef != null && clazztype.tsym.isInterface()) {
1900 // Check that no constructor arguments are given to
1901 // anonymous classes implementing an interface
1902 if (!argtypes.isEmpty())
1903 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
1905 if (!typeargtypes.isEmpty())
1906 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
1908 // Error recovery: pretend no arguments were supplied.
1909 argtypes = List.nil();
1910 typeargtypes = List.nil();
1911 } else if (TreeInfo.isDiamond(tree)) {
1912 ClassType site = new ClassType(clazztype.getEnclosingType(),
1913 clazztype.tsym.type.getTypeArguments(),
1914 clazztype.tsym);
1916 Env<AttrContext> diamondEnv = localEnv.dup(tree);
1917 diamondEnv.info.selectSuper = cdef != null;
1918 diamondEnv.info.pendingResolutionPhase = null;
1920 //if the type of the instance creation expression is a class type
1921 //apply method resolution inference (JLS 15.12.2.7). The return type
1922 //of the resolved constructor will be a partially instantiated type
1923 Symbol constructor = rs.resolveDiamond(tree.pos(),
1924 diamondEnv,
1925 site,
1926 argtypes,
1927 typeargtypes);
1928 tree.constructor = constructor.baseSymbol();
1930 final TypeSymbol csym = clazztype.tsym;
1931 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
1932 @Override
1933 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
1934 enclosingContext.report(tree.clazz,
1935 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
1936 }
1937 });
1938 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
1939 constructorType = checkId(tree, site,
1940 constructor,
1941 diamondEnv,
1942 diamondResult);
1944 tree.clazz.type = types.createErrorType(clazztype);
1945 if (!constructorType.isErroneous()) {
1946 tree.clazz.type = clazztype = constructorType.getReturnType();
1947 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
1948 }
1949 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
1950 }
1952 // Resolve the called constructor under the assumption
1953 // that we are referring to a superclass instance of the
1954 // current instance (JLS ???).
1955 else {
1956 //the following code alters some of the fields in the current
1957 //AttrContext - hence, the current context must be dup'ed in
1958 //order to avoid downstream failures
1959 Env<AttrContext> rsEnv = localEnv.dup(tree);
1960 rsEnv.info.selectSuper = cdef != null;
1961 rsEnv.info.pendingResolutionPhase = null;
1962 tree.constructor = rs.resolveConstructor(
1963 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
1964 if (cdef == null) { //do not check twice!
1965 tree.constructorType = checkId(tree,
1966 clazztype,
1967 tree.constructor,
1968 rsEnv,
1969 new ResultInfo(MTH, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
1970 if (rsEnv.info.lastResolveVarargs())
1971 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
1972 }
1973 findDiamondIfNeeded(localEnv, tree, clazztype);
1974 }
1976 if (cdef != null) {
1977 // We are seeing an anonymous class instance creation.
1978 // In this case, the class instance creation
1979 // expression
1980 //
1981 // E.new <typeargs1>C<typargs2>(args) { ... }
1982 //
1983 // is represented internally as
1984 //
1985 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
1986 //
1987 // This expression is then *transformed* as follows:
1988 //
1989 // (1) add a STATIC flag to the class definition
1990 // if the current environment is static
1991 // (2) add an extends or implements clause
1992 // (3) add a constructor.
1993 //
1994 // For instance, if C is a class, and ET is the type of E,
1995 // the expression
1996 //
1997 // E.new <typeargs1>C<typargs2>(args) { ... }
1998 //
1999 // is translated to (where X is a fresh name and typarams is the
2000 // parameter list of the super constructor):
2001 //
2002 // new <typeargs1>X(<*nullchk*>E, args) where
2003 // X extends C<typargs2> {
2004 // <typarams> X(ET e, args) {
2005 // e.<typeargs1>super(args)
2006 // }
2007 // ...
2008 // }
2009 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2011 if (clazztype.tsym.isInterface()) {
2012 cdef.implementing = List.of(clazz);
2013 } else {
2014 cdef.extending = clazz;
2015 }
2017 attribStat(cdef, localEnv);
2019 checkLambdaCandidate(tree, cdef.sym, clazztype);
2021 // If an outer instance is given,
2022 // prefix it to the constructor arguments
2023 // and delete it from the new expression
2024 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2025 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2026 argtypes = argtypes.prepend(tree.encl.type);
2027 tree.encl = null;
2028 }
2030 // Reassign clazztype and recompute constructor.
2031 clazztype = cdef.sym.type;
2032 Symbol sym = tree.constructor = rs.resolveConstructor(
2033 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2034 Assert.check(sym.kind < AMBIGUOUS);
2035 tree.constructor = sym;
2036 tree.constructorType = checkId(tree,
2037 clazztype,
2038 tree.constructor,
2039 localEnv,
2040 new ResultInfo(VAL, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2041 }
2043 if (tree.constructor != null && tree.constructor.kind == MTH)
2044 owntype = clazztype;
2045 }
2046 result = check(tree, owntype, VAL, resultInfo);
2047 chk.validate(tree.typeargs, localEnv);
2048 }
2049 //where
2050 void findDiamondIfNeeded(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2051 if (tree.def == null &&
2052 !clazztype.isErroneous() &&
2053 clazztype.getTypeArguments().nonEmpty() &&
2054 findDiamonds) {
2055 JCTypeApply ta = (JCTypeApply)tree.clazz;
2056 List<JCExpression> prevTypeargs = ta.arguments;
2057 try {
2058 //create a 'fake' diamond AST node by removing type-argument trees
2059 ta.arguments = List.nil();
2060 ResultInfo findDiamondResult = new ResultInfo(VAL,
2061 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2062 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2063 if (!inferred.isErroneous() &&
2064 types.isAssignable(inferred, pt().hasTag(NONE) ? syms.objectType : pt(), Warner.noWarnings)) {
2065 String key = types.isSameType(clazztype, inferred) ?
2066 "diamond.redundant.args" :
2067 "diamond.redundant.args.1";
2068 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2069 }
2070 } finally {
2071 ta.arguments = prevTypeargs;
2072 }
2073 }
2074 }
2076 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2077 if (allowLambda &&
2078 identifyLambdaCandidate &&
2079 clazztype.hasTag(CLASS) &&
2080 !pt().hasTag(NONE) &&
2081 types.isFunctionalInterface(clazztype.tsym)) {
2082 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2083 int count = 0;
2084 boolean found = false;
2085 for (Symbol sym : csym.members().getElements()) {
2086 if ((sym.flags() & SYNTHETIC) != 0 ||
2087 sym.isConstructor()) continue;
2088 count++;
2089 if (sym.kind != MTH ||
2090 !sym.name.equals(descriptor.name)) continue;
2091 Type mtype = types.memberType(clazztype, sym);
2092 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2093 found = true;
2094 }
2095 }
2096 if (found && count == 1) {
2097 log.note(tree.def, "potential.lambda.found");
2098 }
2099 }
2100 }
2102 /** Make an attributed null check tree.
2103 */
2104 public JCExpression makeNullCheck(JCExpression arg) {
2105 // optimization: X.this is never null; skip null check
2106 Name name = TreeInfo.name(arg);
2107 if (name == names._this || name == names._super) return arg;
2109 JCTree.Tag optag = NULLCHK;
2110 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2111 tree.operator = syms.nullcheck;
2112 tree.type = arg.type;
2113 return tree;
2114 }
2116 public void visitNewArray(JCNewArray tree) {
2117 Type owntype = types.createErrorType(tree.type);
2118 Env<AttrContext> localEnv = env.dup(tree);
2119 Type elemtype;
2120 if (tree.elemtype != null) {
2121 elemtype = attribType(tree.elemtype, localEnv);
2122 chk.validate(tree.elemtype, localEnv);
2123 owntype = elemtype;
2124 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2125 attribExpr(l.head, localEnv, syms.intType);
2126 owntype = new ArrayType(owntype, syms.arrayClass);
2127 }
2128 } else {
2129 // we are seeing an untyped aggregate { ... }
2130 // this is allowed only if the prototype is an array
2131 if (pt().hasTag(ARRAY)) {
2132 elemtype = types.elemtype(pt());
2133 } else {
2134 if (!pt().hasTag(ERROR)) {
2135 log.error(tree.pos(), "illegal.initializer.for.type",
2136 pt());
2137 }
2138 elemtype = types.createErrorType(pt());
2139 }
2140 }
2141 if (tree.elems != null) {
2142 attribExprs(tree.elems, localEnv, elemtype);
2143 owntype = new ArrayType(elemtype, syms.arrayClass);
2144 }
2145 if (!types.isReifiable(elemtype))
2146 log.error(tree.pos(), "generic.array.creation");
2147 result = check(tree, owntype, VAL, resultInfo);
2148 }
2150 /*
2151 * A lambda expression can only be attributed when a target-type is available.
2152 * In addition, if the target-type is that of a functional interface whose
2153 * descriptor contains inference variables in argument position the lambda expression
2154 * is 'stuck' (see DeferredAttr).
2155 */
2156 @Override
2157 public void visitLambda(final JCLambda that) {
2158 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2159 if (pt().hasTag(NONE)) {
2160 //lambda only allowed in assignment or method invocation/cast context
2161 log.error(that.pos(), "unexpected.lambda");
2162 }
2163 result = that.type = types.createErrorType(pt());
2164 return;
2165 }
2166 //create an environment for attribution of the lambda expression
2167 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2168 boolean needsRecovery = resultInfo.checkContext.deferredAttrContext() == deferredAttr.emptyDeferredAttrContext ||
2169 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2170 try {
2171 List<Type> explicitParamTypes = null;
2172 if (TreeInfo.isExplicitLambda(that)) {
2173 //attribute lambda parameters
2174 attribStats(that.params, localEnv);
2175 explicitParamTypes = TreeInfo.types(that.params);
2176 }
2178 Type target = infer.instantiateFunctionalInterface(that, pt(), explicitParamTypes, resultInfo.checkContext);
2179 Type lambdaType = (target == Type.recoveryType) ?
2180 fallbackDescriptorType(that) :
2181 types.findDescriptorType(target);
2183 if (!TreeInfo.isExplicitLambda(that)) {
2184 //add param type info in the AST
2185 List<Type> actuals = lambdaType.getParameterTypes();
2186 List<JCVariableDecl> params = that.params;
2188 boolean arityMismatch = false;
2190 while (params.nonEmpty()) {
2191 if (actuals.isEmpty()) {
2192 //not enough actuals to perform lambda parameter inference
2193 arityMismatch = true;
2194 }
2195 //reset previously set info
2196 Type argType = arityMismatch ?
2197 syms.errType :
2198 actuals.head;
2199 params.head.vartype = make.Type(argType);
2200 params.head.sym = null;
2201 actuals = actuals.isEmpty() ?
2202 actuals :
2203 actuals.tail;
2204 params = params.tail;
2205 }
2207 //attribute lambda parameters
2208 attribStats(that.params, localEnv);
2210 if (arityMismatch) {
2211 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2212 result = that.type = types.createErrorType(target);
2213 return;
2214 }
2215 }
2217 //from this point on, no recovery is needed; if we are in assignment context
2218 //we will be able to attribute the whole lambda body, regardless of errors;
2219 //if we are in a 'check' method context, and the lambda is not compatible
2220 //with the target-type, it will be recovered anyway in Attr.checkId
2221 needsRecovery = false;
2223 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2224 recoveryInfo :
2225 new ResultInfo(VAL, lambdaType.getReturnType(), new LambdaReturnContext(resultInfo.checkContext));
2226 localEnv.info.returnResult = bodyResultInfo;
2228 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2229 attribTree(that.getBody(), localEnv, bodyResultInfo);
2230 } else {
2231 JCBlock body = (JCBlock)that.body;
2232 attribStats(body.stats, localEnv);
2233 }
2235 result = check(that, target, VAL, resultInfo);
2237 boolean isSpeculativeRound =
2238 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2240 postAttr(that);
2241 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2243 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2245 if (!isSpeculativeRound) {
2246 checkAccessibleFunctionalDescriptor(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType);
2247 }
2248 result = check(that, target, VAL, resultInfo);
2249 } catch (Types.FunctionDescriptorLookupError ex) {
2250 JCDiagnostic cause = ex.getDiagnostic();
2251 resultInfo.checkContext.report(that, cause);
2252 result = that.type = types.createErrorType(pt());
2253 return;
2254 } finally {
2255 localEnv.info.scope.leave();
2256 if (needsRecovery) {
2257 attribTree(that, env, recoveryInfo);
2258 }
2259 }
2260 }
2261 //where
2262 private Type fallbackDescriptorType(JCExpression tree) {
2263 switch (tree.getTag()) {
2264 case LAMBDA:
2265 JCLambda lambda = (JCLambda)tree;
2266 List<Type> argtypes = List.nil();
2267 for (JCVariableDecl param : lambda.params) {
2268 argtypes = param.vartype != null ?
2269 argtypes.append(param.vartype.type) :
2270 argtypes.append(syms.errType);
2271 }
2272 return new MethodType(argtypes, Type.recoveryType, List.<Type>nil(), syms.methodClass);
2273 case REFERENCE:
2274 return new MethodType(List.<Type>nil(), Type.recoveryType, List.<Type>nil(), syms.methodClass);
2275 default:
2276 Assert.error("Cannot get here!");
2277 }
2278 return null;
2279 }
2281 private void checkAccessibleFunctionalDescriptor(final DiagnosticPosition pos,
2282 final Env<AttrContext> env, final InferenceContext inferenceContext, final Type desc) {
2283 if (inferenceContext.free(desc)) {
2284 inferenceContext.addFreeTypeListener(List.of(desc), new FreeTypeListener() {
2285 @Override
2286 public void typesInferred(InferenceContext inferenceContext) {
2287 checkAccessibleFunctionalDescriptor(pos, env, inferenceContext, inferenceContext.asInstType(desc, types));
2288 }
2289 });
2290 } else {
2291 chk.checkAccessibleFunctionalDescriptor(pos, env, desc);
2292 }
2293 }
2295 /**
2296 * Lambda/method reference have a special check context that ensures
2297 * that i.e. a lambda return type is compatible with the expected
2298 * type according to both the inherited context and the assignment
2299 * context.
2300 */
2301 class LambdaReturnContext extends Check.NestedCheckContext {
2302 public LambdaReturnContext(CheckContext enclosingContext) {
2303 super(enclosingContext);
2304 }
2306 @Override
2307 public boolean compatible(Type found, Type req, Warner warn) {
2308 //return type must be compatible in both current context and assignment context
2309 return types.isAssignable(found, inferenceContext().asFree(req, types), warn) &&
2310 super.compatible(found, req, warn);
2311 }
2312 @Override
2313 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2314 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2315 }
2316 }
2318 /**
2319 * Lambda compatibility. Check that given return types, thrown types, parameter types
2320 * are compatible with the expected functional interface descriptor. This means that:
2321 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2322 * types must be compatible with the return type of the expected descriptor;
2323 * (iii) thrown types must be 'included' in the thrown types list of the expected
2324 * descriptor.
2325 */
2326 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2327 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType(), types);
2329 //return values have already been checked - but if lambda has no return
2330 //values, we must ensure that void/value compatibility is correct;
2331 //this amounts at checking that, if a lambda body can complete normally,
2332 //the descriptor's return type must be void
2333 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2334 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2335 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2336 diags.fragment("missing.ret.val", returnType)));
2337 }
2339 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes(), types);
2340 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2341 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2342 }
2344 if (!speculativeAttr) {
2345 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes(), types);
2346 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2347 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2348 }
2349 }
2350 }
2352 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2353 Env<AttrContext> lambdaEnv;
2354 Symbol owner = env.info.scope.owner;
2355 if (owner.kind == VAR && owner.owner.kind == TYP) {
2356 //field initializer
2357 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2358 lambdaEnv.info.scope.owner =
2359 new MethodSymbol(0, names.empty, null,
2360 env.info.scope.owner);
2361 } else {
2362 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2363 }
2364 return lambdaEnv;
2365 }
2367 @Override
2368 public void visitReference(final JCMemberReference that) {
2369 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2370 if (pt().hasTag(NONE)) {
2371 //method reference only allowed in assignment or method invocation/cast context
2372 log.error(that.pos(), "unexpected.mref");
2373 }
2374 result = that.type = types.createErrorType(pt());
2375 return;
2376 }
2377 final Env<AttrContext> localEnv = env.dup(that);
2378 try {
2379 //attribute member reference qualifier - if this is a constructor
2380 //reference, the expected kind must be a type
2381 Type exprType = attribTree(that.expr,
2382 env, new ResultInfo(that.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType));
2384 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2385 exprType = chk.checkConstructorRefType(that.expr, exprType);
2386 }
2388 if (exprType.isErroneous()) {
2389 //if the qualifier expression contains problems,
2390 //give up atttribution of method reference
2391 result = that.type = exprType;
2392 return;
2393 }
2395 if (TreeInfo.isStaticSelector(that.expr, names) &&
2396 (that.getMode() != ReferenceMode.NEW || !that.expr.type.isRaw())) {
2397 //if the qualifier is a type, validate it
2398 chk.validate(that.expr, env);
2399 }
2401 //attrib type-arguments
2402 List<Type> typeargtypes = null;
2403 if (that.typeargs != null) {
2404 typeargtypes = attribTypes(that.typeargs, localEnv);
2405 }
2407 Type target = infer.instantiateFunctionalInterface(that, pt(), null, resultInfo.checkContext);
2408 Type desc = (target == Type.recoveryType) ?
2409 fallbackDescriptorType(that) :
2410 types.findDescriptorType(target);
2412 List<Type> argtypes = desc.getParameterTypes();
2414 boolean allowBoxing =
2415 resultInfo.checkContext.deferredAttrContext() == deferredAttr.emptyDeferredAttrContext ||
2416 resultInfo.checkContext.deferredAttrContext().phase.isBoxingRequired();
2417 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = rs.resolveMemberReference(that.pos(), localEnv, that,
2418 that.expr.type, that.name, argtypes, typeargtypes, allowBoxing);
2420 Symbol refSym = refResult.fst;
2421 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2423 if (refSym.kind != MTH) {
2424 boolean targetError;
2425 switch (refSym.kind) {
2426 case ABSENT_MTH:
2427 targetError = false;
2428 break;
2429 case WRONG_MTH:
2430 case WRONG_MTHS:
2431 case AMBIGUOUS:
2432 case HIDDEN:
2433 case STATICERR:
2434 case MISSING_ENCL:
2435 targetError = true;
2436 break;
2437 default:
2438 Assert.error("unexpected result kind " + refSym.kind);
2439 targetError = false;
2440 }
2442 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2443 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2445 JCDiagnostic.DiagnosticType diagKind = targetError ?
2446 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2448 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2449 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2451 if (targetError) {
2452 resultInfo.checkContext.report(that, diag);
2453 } else {
2454 log.report(diag);
2455 }
2456 result = that.type = types.createErrorType(target);
2457 return;
2458 }
2460 if (desc.getReturnType() == Type.recoveryType) {
2461 // stop here
2462 result = that.type = types.createErrorType(target);
2463 return;
2464 }
2466 that.sym = refSym.baseSymbol();
2467 that.kind = lookupHelper.referenceKind(that.sym);
2469 ResultInfo checkInfo =
2470 resultInfo.dup(newMethodTemplate(
2471 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2472 lookupHelper.argtypes,
2473 typeargtypes));
2475 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2477 if (!refType.isErroneous()) {
2478 refType = types.createMethodTypeWithReturn(refType,
2479 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2480 }
2482 //go ahead with standard method reference compatibility check - note that param check
2483 //is a no-op (as this has been taken care during method applicability)
2484 boolean isSpeculativeRound =
2485 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2486 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2487 if (!isSpeculativeRound) {
2488 checkAccessibleFunctionalDescriptor(that, localEnv, resultInfo.checkContext.inferenceContext(), desc);
2489 }
2490 result = check(that, target, VAL, resultInfo);
2491 } catch (Types.FunctionDescriptorLookupError ex) {
2492 JCDiagnostic cause = ex.getDiagnostic();
2493 resultInfo.checkContext.report(that, cause);
2494 result = that.type = types.createErrorType(pt());
2495 return;
2496 }
2497 }
2499 @SuppressWarnings("fallthrough")
2500 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2501 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType(), types);
2503 Type resType;
2504 switch (tree.getMode()) {
2505 case NEW:
2506 if (!tree.expr.type.isRaw()) {
2507 resType = tree.expr.type;
2508 break;
2509 }
2510 default:
2511 resType = refType.getReturnType();
2512 }
2514 Type incompatibleReturnType = resType;
2516 if (returnType.hasTag(VOID)) {
2517 incompatibleReturnType = null;
2518 }
2520 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2521 if (resType.isErroneous() ||
2522 new LambdaReturnContext(checkContext).compatible(resType, returnType, Warner.noWarnings)) {
2523 incompatibleReturnType = null;
2524 }
2525 }
2527 if (incompatibleReturnType != null) {
2528 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2529 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2530 }
2532 if (!speculativeAttr) {
2533 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes(), types);
2534 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2535 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2536 }
2537 }
2538 }
2540 public void visitParens(JCParens tree) {
2541 Type owntype = attribTree(tree.expr, env, resultInfo);
2542 result = check(tree, owntype, pkind(), resultInfo);
2543 Symbol sym = TreeInfo.symbol(tree);
2544 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2545 log.error(tree.pos(), "illegal.start.of.type");
2546 }
2548 public void visitAssign(JCAssign tree) {
2549 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2550 Type capturedType = capture(owntype);
2551 attribExpr(tree.rhs, env, owntype);
2552 result = check(tree, capturedType, VAL, resultInfo);
2553 }
2555 public void visitAssignop(JCAssignOp tree) {
2556 // Attribute arguments.
2557 Type owntype = attribTree(tree.lhs, env, varInfo);
2558 Type operand = attribExpr(tree.rhs, env);
2559 // Find operator.
2560 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2561 tree.pos(), tree.getTag().noAssignOp(), env,
2562 owntype, operand);
2564 if (operator.kind == MTH &&
2565 !owntype.isErroneous() &&
2566 !operand.isErroneous()) {
2567 chk.checkOperator(tree.pos(),
2568 (OperatorSymbol)operator,
2569 tree.getTag().noAssignOp(),
2570 owntype,
2571 operand);
2572 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2573 chk.checkCastable(tree.rhs.pos(),
2574 operator.type.getReturnType(),
2575 owntype);
2576 }
2577 result = check(tree, owntype, VAL, resultInfo);
2578 }
2580 public void visitUnary(JCUnary tree) {
2581 // Attribute arguments.
2582 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2583 ? attribTree(tree.arg, env, varInfo)
2584 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2586 // Find operator.
2587 Symbol operator = tree.operator =
2588 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2590 Type owntype = types.createErrorType(tree.type);
2591 if (operator.kind == MTH &&
2592 !argtype.isErroneous()) {
2593 owntype = (tree.getTag().isIncOrDecUnaryOp())
2594 ? tree.arg.type
2595 : operator.type.getReturnType();
2596 int opc = ((OperatorSymbol)operator).opcode;
2598 // If the argument is constant, fold it.
2599 if (argtype.constValue() != null) {
2600 Type ctype = cfolder.fold1(opc, argtype);
2601 if (ctype != null) {
2602 owntype = cfolder.coerce(ctype, owntype);
2604 // Remove constant types from arguments to
2605 // conserve space. The parser will fold concatenations
2606 // of string literals; the code here also
2607 // gets rid of intermediate results when some of the
2608 // operands are constant identifiers.
2609 if (tree.arg.type.tsym == syms.stringType.tsym) {
2610 tree.arg.type = syms.stringType;
2611 }
2612 }
2613 }
2614 }
2615 result = check(tree, owntype, VAL, resultInfo);
2616 }
2618 public void visitBinary(JCBinary tree) {
2619 // Attribute arguments.
2620 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
2621 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
2623 // Find operator.
2624 Symbol operator = tree.operator =
2625 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
2627 Type owntype = types.createErrorType(tree.type);
2628 if (operator.kind == MTH &&
2629 !left.isErroneous() &&
2630 !right.isErroneous()) {
2631 owntype = operator.type.getReturnType();
2632 int opc = chk.checkOperator(tree.lhs.pos(),
2633 (OperatorSymbol)operator,
2634 tree.getTag(),
2635 left,
2636 right);
2638 // If both arguments are constants, fold them.
2639 if (left.constValue() != null && right.constValue() != null) {
2640 Type ctype = cfolder.fold2(opc, left, right);
2641 if (ctype != null) {
2642 owntype = cfolder.coerce(ctype, owntype);
2644 // Remove constant types from arguments to
2645 // conserve space. The parser will fold concatenations
2646 // of string literals; the code here also
2647 // gets rid of intermediate results when some of the
2648 // operands are constant identifiers.
2649 if (tree.lhs.type.tsym == syms.stringType.tsym) {
2650 tree.lhs.type = syms.stringType;
2651 }
2652 if (tree.rhs.type.tsym == syms.stringType.tsym) {
2653 tree.rhs.type = syms.stringType;
2654 }
2655 }
2656 }
2658 // Check that argument types of a reference ==, != are
2659 // castable to each other, (JLS???).
2660 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
2661 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
2662 log.error(tree.pos(), "incomparable.types", left, right);
2663 }
2664 }
2666 chk.checkDivZero(tree.rhs.pos(), operator, right);
2667 }
2668 result = check(tree, owntype, VAL, resultInfo);
2669 }
2671 public void visitTypeCast(final JCTypeCast tree) {
2672 Type clazztype = attribType(tree.clazz, env);
2673 chk.validate(tree.clazz, env, false);
2674 //a fresh environment is required for 292 inference to work properly ---
2675 //see Infer.instantiatePolymorphicSignatureInstance()
2676 Env<AttrContext> localEnv = env.dup(tree);
2677 //should we propagate the target type?
2678 final ResultInfo castInfo;
2679 final boolean isPoly = TreeInfo.isPoly(tree.expr, tree);
2680 if (isPoly) {
2681 //expression is a poly - we need to propagate target type info
2682 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
2683 @Override
2684 public boolean compatible(Type found, Type req, Warner warn) {
2685 return types.isCastable(found, req, warn);
2686 }
2687 });
2688 } else {
2689 //standalone cast - target-type info is not propagated
2690 castInfo = unknownExprInfo;
2691 }
2692 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
2693 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2694 if (exprtype.constValue() != null)
2695 owntype = cfolder.coerce(exprtype, owntype);
2696 result = check(tree, capture(owntype), VAL, resultInfo);
2697 if (!isPoly)
2698 chk.checkRedundantCast(localEnv, tree);
2699 }
2701 public void visitTypeTest(JCInstanceOf tree) {
2702 Type exprtype = chk.checkNullOrRefType(
2703 tree.expr.pos(), attribExpr(tree.expr, env));
2704 Type clazztype = chk.checkReifiableReferenceType(
2705 tree.clazz.pos(), attribType(tree.clazz, env));
2706 chk.validate(tree.clazz, env, false);
2707 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2708 result = check(tree, syms.booleanType, VAL, resultInfo);
2709 }
2711 public void visitIndexed(JCArrayAccess tree) {
2712 Type owntype = types.createErrorType(tree.type);
2713 Type atype = attribExpr(tree.indexed, env);
2714 attribExpr(tree.index, env, syms.intType);
2715 if (types.isArray(atype))
2716 owntype = types.elemtype(atype);
2717 else if (!atype.hasTag(ERROR))
2718 log.error(tree.pos(), "array.req.but.found", atype);
2719 if ((pkind() & VAR) == 0) owntype = capture(owntype);
2720 result = check(tree, owntype, VAR, resultInfo);
2721 }
2723 public void visitIdent(JCIdent tree) {
2724 Symbol sym;
2726 // Find symbol
2727 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
2728 // If we are looking for a method, the prototype `pt' will be a
2729 // method type with the type of the call's arguments as parameters.
2730 env.info.pendingResolutionPhase = null;
2731 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
2732 } else if (tree.sym != null && tree.sym.kind != VAR) {
2733 sym = tree.sym;
2734 } else {
2735 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
2736 }
2737 tree.sym = sym;
2739 // (1) Also find the environment current for the class where
2740 // sym is defined (`symEnv').
2741 // Only for pre-tiger versions (1.4 and earlier):
2742 // (2) Also determine whether we access symbol out of an anonymous
2743 // class in a this or super call. This is illegal for instance
2744 // members since such classes don't carry a this$n link.
2745 // (`noOuterThisPath').
2746 Env<AttrContext> symEnv = env;
2747 boolean noOuterThisPath = false;
2748 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
2749 (sym.kind & (VAR | MTH | TYP)) != 0 &&
2750 sym.owner.kind == TYP &&
2751 tree.name != names._this && tree.name != names._super) {
2753 // Find environment in which identifier is defined.
2754 while (symEnv.outer != null &&
2755 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
2756 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
2757 noOuterThisPath = !allowAnonOuterThis;
2758 symEnv = symEnv.outer;
2759 }
2760 }
2762 // If symbol is a variable, ...
2763 if (sym.kind == VAR) {
2764 VarSymbol v = (VarSymbol)sym;
2766 // ..., evaluate its initializer, if it has one, and check for
2767 // illegal forward reference.
2768 checkInit(tree, env, v, false);
2770 // If we are expecting a variable (as opposed to a value), check
2771 // that the variable is assignable in the current environment.
2772 if (pkind() == VAR)
2773 checkAssignable(tree.pos(), v, null, env);
2774 }
2776 // In a constructor body,
2777 // if symbol is a field or instance method, check that it is
2778 // not accessed before the supertype constructor is called.
2779 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
2780 (sym.kind & (VAR | MTH)) != 0 &&
2781 sym.owner.kind == TYP &&
2782 (sym.flags() & STATIC) == 0) {
2783 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
2784 }
2785 Env<AttrContext> env1 = env;
2786 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
2787 // If the found symbol is inaccessible, then it is
2788 // accessed through an enclosing instance. Locate this
2789 // enclosing instance:
2790 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
2791 env1 = env1.outer;
2792 }
2793 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
2794 }
2796 public void visitSelect(JCFieldAccess tree) {
2797 // Determine the expected kind of the qualifier expression.
2798 int skind = 0;
2799 if (tree.name == names._this || tree.name == names._super ||
2800 tree.name == names._class)
2801 {
2802 skind = TYP;
2803 } else {
2804 if ((pkind() & PCK) != 0) skind = skind | PCK;
2805 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
2806 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
2807 }
2809 // Attribute the qualifier expression, and determine its symbol (if any).
2810 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
2811 if ((pkind() & (PCK | TYP)) == 0)
2812 site = capture(site); // Capture field access
2814 // don't allow T.class T[].class, etc
2815 if (skind == TYP) {
2816 Type elt = site;
2817 while (elt.hasTag(ARRAY))
2818 elt = ((ArrayType)elt).elemtype;
2819 if (elt.hasTag(TYPEVAR)) {
2820 log.error(tree.pos(), "type.var.cant.be.deref");
2821 result = types.createErrorType(tree.type);
2822 return;
2823 }
2824 }
2826 // If qualifier symbol is a type or `super', assert `selectSuper'
2827 // for the selection. This is relevant for determining whether
2828 // protected symbols are accessible.
2829 Symbol sitesym = TreeInfo.symbol(tree.selected);
2830 boolean selectSuperPrev = env.info.selectSuper;
2831 env.info.selectSuper =
2832 sitesym != null &&
2833 sitesym.name == names._super;
2835 // Determine the symbol represented by the selection.
2836 env.info.pendingResolutionPhase = null;
2837 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
2838 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
2839 site = capture(site);
2840 sym = selectSym(tree, sitesym, site, env, resultInfo);
2841 }
2842 boolean varArgs = env.info.lastResolveVarargs();
2843 tree.sym = sym;
2845 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
2846 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
2847 site = capture(site);
2848 }
2850 // If that symbol is a variable, ...
2851 if (sym.kind == VAR) {
2852 VarSymbol v = (VarSymbol)sym;
2854 // ..., evaluate its initializer, if it has one, and check for
2855 // illegal forward reference.
2856 checkInit(tree, env, v, true);
2858 // If we are expecting a variable (as opposed to a value), check
2859 // that the variable is assignable in the current environment.
2860 if (pkind() == VAR)
2861 checkAssignable(tree.pos(), v, tree.selected, env);
2862 }
2864 if (sitesym != null &&
2865 sitesym.kind == VAR &&
2866 ((VarSymbol)sitesym).isResourceVariable() &&
2867 sym.kind == MTH &&
2868 sym.name.equals(names.close) &&
2869 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
2870 env.info.lint.isEnabled(LintCategory.TRY)) {
2871 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
2872 }
2874 // Disallow selecting a type from an expression
2875 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
2876 tree.type = check(tree.selected, pt(),
2877 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
2878 }
2880 if (isType(sitesym)) {
2881 if (sym.name == names._this) {
2882 // If `C' is the currently compiled class, check that
2883 // C.this' does not appear in a call to a super(...)
2884 if (env.info.isSelfCall &&
2885 site.tsym == env.enclClass.sym) {
2886 chk.earlyRefError(tree.pos(), sym);
2887 }
2888 } else {
2889 // Check if type-qualified fields or methods are static (JLS)
2890 if ((sym.flags() & STATIC) == 0 &&
2891 !env.next.tree.hasTag(REFERENCE) &&
2892 sym.name != names._super &&
2893 (sym.kind == VAR || sym.kind == MTH)) {
2894 rs.accessBase(rs.new StaticError(sym),
2895 tree.pos(), site, sym.name, true);
2896 }
2897 }
2898 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
2899 // If the qualified item is not a type and the selected item is static, report
2900 // a warning. Make allowance for the class of an array type e.g. Object[].class)
2901 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
2902 }
2904 // If we are selecting an instance member via a `super', ...
2905 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
2907 // Check that super-qualified symbols are not abstract (JLS)
2908 rs.checkNonAbstract(tree.pos(), sym);
2910 if (site.isRaw()) {
2911 // Determine argument types for site.
2912 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
2913 if (site1 != null) site = site1;
2914 }
2915 }
2917 env.info.selectSuper = selectSuperPrev;
2918 result = checkId(tree, site, sym, env, resultInfo);
2919 }
2920 //where
2921 /** Determine symbol referenced by a Select expression,
2922 *
2923 * @param tree The select tree.
2924 * @param site The type of the selected expression,
2925 * @param env The current environment.
2926 * @param resultInfo The current result.
2927 */
2928 private Symbol selectSym(JCFieldAccess tree,
2929 Symbol location,
2930 Type site,
2931 Env<AttrContext> env,
2932 ResultInfo resultInfo) {
2933 DiagnosticPosition pos = tree.pos();
2934 Name name = tree.name;
2935 switch (site.getTag()) {
2936 case PACKAGE:
2937 return rs.accessBase(
2938 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
2939 pos, location, site, name, true);
2940 case ARRAY:
2941 case CLASS:
2942 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
2943 return rs.resolveQualifiedMethod(
2944 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
2945 } else if (name == names._this || name == names._super) {
2946 return rs.resolveSelf(pos, env, site.tsym, name);
2947 } else if (name == names._class) {
2948 // In this case, we have already made sure in
2949 // visitSelect that qualifier expression is a type.
2950 Type t = syms.classType;
2951 List<Type> typeargs = allowGenerics
2952 ? List.of(types.erasure(site))
2953 : List.<Type>nil();
2954 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
2955 return new VarSymbol(
2956 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2957 } else {
2958 // We are seeing a plain identifier as selector.
2959 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
2960 if ((resultInfo.pkind & ERRONEOUS) == 0)
2961 sym = rs.accessBase(sym, pos, location, site, name, true);
2962 return sym;
2963 }
2964 case WILDCARD:
2965 throw new AssertionError(tree);
2966 case TYPEVAR:
2967 // Normally, site.getUpperBound() shouldn't be null.
2968 // It should only happen during memberEnter/attribBase
2969 // when determining the super type which *must* beac
2970 // done before attributing the type variables. In
2971 // other words, we are seeing this illegal program:
2972 // class B<T> extends A<T.foo> {}
2973 Symbol sym = (site.getUpperBound() != null)
2974 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
2975 : null;
2976 if (sym == null) {
2977 log.error(pos, "type.var.cant.be.deref");
2978 return syms.errSymbol;
2979 } else {
2980 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
2981 rs.new AccessError(env, site, sym) :
2982 sym;
2983 rs.accessBase(sym2, pos, location, site, name, true);
2984 return sym;
2985 }
2986 case ERROR:
2987 // preserve identifier names through errors
2988 return types.createErrorType(name, site.tsym, site).tsym;
2989 default:
2990 // The qualifier expression is of a primitive type -- only
2991 // .class is allowed for these.
2992 if (name == names._class) {
2993 // In this case, we have already made sure in Select that
2994 // qualifier expression is a type.
2995 Type t = syms.classType;
2996 Type arg = types.boxedClass(site).type;
2997 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
2998 return new VarSymbol(
2999 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3000 } else {
3001 log.error(pos, "cant.deref", site);
3002 return syms.errSymbol;
3003 }
3004 }
3005 }
3007 /** Determine type of identifier or select expression and check that
3008 * (1) the referenced symbol is not deprecated
3009 * (2) the symbol's type is safe (@see checkSafe)
3010 * (3) if symbol is a variable, check that its type and kind are
3011 * compatible with the prototype and protokind.
3012 * (4) if symbol is an instance field of a raw type,
3013 * which is being assigned to, issue an unchecked warning if its
3014 * type changes under erasure.
3015 * (5) if symbol is an instance method of a raw type, issue an
3016 * unchecked warning if its argument types change under erasure.
3017 * If checks succeed:
3018 * If symbol is a constant, return its constant type
3019 * else if symbol is a method, return its result type
3020 * otherwise return its type.
3021 * Otherwise return errType.
3022 *
3023 * @param tree The syntax tree representing the identifier
3024 * @param site If this is a select, the type of the selected
3025 * expression, otherwise the type of the current class.
3026 * @param sym The symbol representing the identifier.
3027 * @param env The current environment.
3028 * @param resultInfo The expected result
3029 */
3030 Type checkId(JCTree tree,
3031 Type site,
3032 Symbol sym,
3033 Env<AttrContext> env,
3034 ResultInfo resultInfo) {
3035 Type pt = resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD) ?
3036 resultInfo.pt.map(deferredAttr.new DeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase)) :
3037 resultInfo.pt;
3039 DeferredAttr.DeferredTypeMap recoveryMap =
3040 deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3042 if (pt.isErroneous()) {
3043 Type.map(resultInfo.pt.getParameterTypes(), recoveryMap);
3044 return types.createErrorType(site);
3045 }
3046 Type owntype; // The computed type of this identifier occurrence.
3047 switch (sym.kind) {
3048 case TYP:
3049 // For types, the computed type equals the symbol's type,
3050 // except for two situations:
3051 owntype = sym.type;
3052 if (owntype.hasTag(CLASS)) {
3053 Type ownOuter = owntype.getEnclosingType();
3055 // (a) If the symbol's type is parameterized, erase it
3056 // because no type parameters were given.
3057 // We recover generic outer type later in visitTypeApply.
3058 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3059 owntype = types.erasure(owntype);
3060 }
3062 // (b) If the symbol's type is an inner class, then
3063 // we have to interpret its outer type as a superclass
3064 // of the site type. Example:
3065 //
3066 // class Tree<A> { class Visitor { ... } }
3067 // class PointTree extends Tree<Point> { ... }
3068 // ...PointTree.Visitor...
3069 //
3070 // Then the type of the last expression above is
3071 // Tree<Point>.Visitor.
3072 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3073 Type normOuter = site;
3074 if (normOuter.hasTag(CLASS))
3075 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3076 if (normOuter == null) // perhaps from an import
3077 normOuter = types.erasure(ownOuter);
3078 if (normOuter != ownOuter)
3079 owntype = new ClassType(
3080 normOuter, List.<Type>nil(), owntype.tsym);
3081 }
3082 }
3083 break;
3084 case VAR:
3085 VarSymbol v = (VarSymbol)sym;
3086 // Test (4): if symbol is an instance field of a raw type,
3087 // which is being assigned to, issue an unchecked warning if
3088 // its type changes under erasure.
3089 if (allowGenerics &&
3090 resultInfo.pkind == VAR &&
3091 v.owner.kind == TYP &&
3092 (v.flags() & STATIC) == 0 &&
3093 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3094 Type s = types.asOuterSuper(site, v.owner);
3095 if (s != null &&
3096 s.isRaw() &&
3097 !types.isSameType(v.type, v.erasure(types))) {
3098 chk.warnUnchecked(tree.pos(),
3099 "unchecked.assign.to.var",
3100 v, s);
3101 }
3102 }
3103 // The computed type of a variable is the type of the
3104 // variable symbol, taken as a member of the site type.
3105 owntype = (sym.owner.kind == TYP &&
3106 sym.name != names._this && sym.name != names._super)
3107 ? types.memberType(site, sym)
3108 : sym.type;
3110 // If the variable is a constant, record constant value in
3111 // computed type.
3112 if (v.getConstValue() != null && isStaticReference(tree))
3113 owntype = owntype.constType(v.getConstValue());
3115 if (resultInfo.pkind == VAL) {
3116 owntype = capture(owntype); // capture "names as expressions"
3117 }
3118 break;
3119 case MTH: {
3120 owntype = checkMethod(site, sym,
3121 new ResultInfo(VAL, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3122 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3123 resultInfo.pt.getTypeArguments());
3124 break;
3125 }
3126 case PCK: case ERR:
3127 Type.map(resultInfo.pt.getParameterTypes(), recoveryMap);
3128 owntype = sym.type;
3129 break;
3130 default:
3131 throw new AssertionError("unexpected kind: " + sym.kind +
3132 " in tree " + tree);
3133 }
3135 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3136 // (for constructors, the error was given when the constructor was
3137 // resolved)
3139 if (sym.name != names.init) {
3140 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3141 chk.checkSunAPI(tree.pos(), sym);
3142 }
3144 // Test (3): if symbol is a variable, check that its type and
3145 // kind are compatible with the prototype and protokind.
3146 return check(tree, owntype, sym.kind, resultInfo);
3147 }
3149 /** Check that variable is initialized and evaluate the variable's
3150 * initializer, if not yet done. Also check that variable is not
3151 * referenced before it is defined.
3152 * @param tree The tree making up the variable reference.
3153 * @param env The current environment.
3154 * @param v The variable's symbol.
3155 */
3156 private void checkInit(JCTree tree,
3157 Env<AttrContext> env,
3158 VarSymbol v,
3159 boolean onlyWarning) {
3160 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3161 // tree.pos + " " + v.pos + " " +
3162 // Resolve.isStatic(env));//DEBUG
3164 // A forward reference is diagnosed if the declaration position
3165 // of the variable is greater than the current tree position
3166 // and the tree and variable definition occur in the same class
3167 // definition. Note that writes don't count as references.
3168 // This check applies only to class and instance
3169 // variables. Local variables follow different scope rules,
3170 // and are subject to definite assignment checking.
3171 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3172 v.owner.kind == TYP &&
3173 canOwnInitializer(owner(env)) &&
3174 v.owner == env.info.scope.owner.enclClass() &&
3175 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3176 (!env.tree.hasTag(ASSIGN) ||
3177 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3178 String suffix = (env.info.enclVar == v) ?
3179 "self.ref" : "forward.ref";
3180 if (!onlyWarning || isStaticEnumField(v)) {
3181 log.error(tree.pos(), "illegal." + suffix);
3182 } else if (useBeforeDeclarationWarning) {
3183 log.warning(tree.pos(), suffix, v);
3184 }
3185 }
3187 v.getConstValue(); // ensure initializer is evaluated
3189 checkEnumInitializer(tree, env, v);
3190 }
3192 /**
3193 * Check for illegal references to static members of enum. In
3194 * an enum type, constructors and initializers may not
3195 * reference its static members unless they are constant.
3196 *
3197 * @param tree The tree making up the variable reference.
3198 * @param env The current environment.
3199 * @param v The variable's symbol.
3200 * @jls section 8.9 Enums
3201 */
3202 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3203 // JLS:
3204 //
3205 // "It is a compile-time error to reference a static field
3206 // of an enum type that is not a compile-time constant
3207 // (15.28) from constructors, instance initializer blocks,
3208 // or instance variable initializer expressions of that
3209 // type. It is a compile-time error for the constructors,
3210 // instance initializer blocks, or instance variable
3211 // initializer expressions of an enum constant e to refer
3212 // to itself or to an enum constant of the same type that
3213 // is declared to the right of e."
3214 if (isStaticEnumField(v)) {
3215 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3217 if (enclClass == null || enclClass.owner == null)
3218 return;
3220 // See if the enclosing class is the enum (or a
3221 // subclass thereof) declaring v. If not, this
3222 // reference is OK.
3223 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3224 return;
3226 // If the reference isn't from an initializer, then
3227 // the reference is OK.
3228 if (!Resolve.isInitializer(env))
3229 return;
3231 log.error(tree.pos(), "illegal.enum.static.ref");
3232 }
3233 }
3235 /** Is the given symbol a static, non-constant field of an Enum?
3236 * Note: enum literals should not be regarded as such
3237 */
3238 private boolean isStaticEnumField(VarSymbol v) {
3239 return Flags.isEnum(v.owner) &&
3240 Flags.isStatic(v) &&
3241 !Flags.isConstant(v) &&
3242 v.name != names._class;
3243 }
3245 /** Can the given symbol be the owner of code which forms part
3246 * if class initialization? This is the case if the symbol is
3247 * a type or field, or if the symbol is the synthetic method.
3248 * owning a block.
3249 */
3250 private boolean canOwnInitializer(Symbol sym) {
3251 return
3252 (sym.kind & (VAR | TYP)) != 0 ||
3253 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3254 }
3256 Warner noteWarner = new Warner();
3258 /**
3259 * Check that method arguments conform to its instantiation.
3260 **/
3261 public Type checkMethod(Type site,
3262 Symbol sym,
3263 ResultInfo resultInfo,
3264 Env<AttrContext> env,
3265 final List<JCExpression> argtrees,
3266 List<Type> argtypes,
3267 List<Type> typeargtypes) {
3268 // Test (5): if symbol is an instance method of a raw type, issue
3269 // an unchecked warning if its argument types change under erasure.
3270 if (allowGenerics &&
3271 (sym.flags() & STATIC) == 0 &&
3272 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3273 Type s = types.asOuterSuper(site, sym.owner);
3274 if (s != null && s.isRaw() &&
3275 !types.isSameTypes(sym.type.getParameterTypes(),
3276 sym.erasure(types).getParameterTypes())) {
3277 chk.warnUnchecked(env.tree.pos(),
3278 "unchecked.call.mbr.of.raw.type",
3279 sym, s);
3280 }
3281 }
3283 // Compute the identifier's instantiated type.
3284 // For methods, we need to compute the instance type by
3285 // Resolve.instantiate from the symbol's type as well as
3286 // any type arguments and value arguments.
3287 noteWarner.clear();
3288 try {
3289 Type owntype = rs.checkMethod(
3290 env,
3291 site,
3292 sym,
3293 resultInfo,
3294 argtypes,
3295 typeargtypes,
3296 noteWarner);
3298 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3299 noteWarner.hasNonSilentLint(LintCategory.UNCHECKED));
3300 } catch (Infer.InferenceException ex) {
3301 //invalid target type - propagate exception outwards or report error
3302 //depending on the current check context
3303 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3304 return types.createErrorType(site);
3305 } catch (Resolve.InapplicableMethodException ex) {
3306 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3307 return null;
3308 }
3309 }
3311 public void visitLiteral(JCLiteral tree) {
3312 result = check(
3313 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3314 }
3315 //where
3316 /** Return the type of a literal with given type tag.
3317 */
3318 Type litType(TypeTag tag) {
3319 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3320 }
3322 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3323 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3324 }
3326 public void visitTypeArray(JCArrayTypeTree tree) {
3327 Type etype = attribType(tree.elemtype, env);
3328 Type type = new ArrayType(etype, syms.arrayClass);
3329 result = check(tree, type, TYP, resultInfo);
3330 }
3332 /** Visitor method for parameterized types.
3333 * Bound checking is left until later, since types are attributed
3334 * before supertype structure is completely known
3335 */
3336 public void visitTypeApply(JCTypeApply tree) {
3337 Type owntype = types.createErrorType(tree.type);
3339 // Attribute functor part of application and make sure it's a class.
3340 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3342 // Attribute type parameters
3343 List<Type> actuals = attribTypes(tree.arguments, env);
3345 if (clazztype.hasTag(CLASS)) {
3346 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3347 if (actuals.isEmpty()) //diamond
3348 actuals = formals;
3350 if (actuals.length() == formals.length()) {
3351 List<Type> a = actuals;
3352 List<Type> f = formals;
3353 while (a.nonEmpty()) {
3354 a.head = a.head.withTypeVar(f.head);
3355 a = a.tail;
3356 f = f.tail;
3357 }
3358 // Compute the proper generic outer
3359 Type clazzOuter = clazztype.getEnclosingType();
3360 if (clazzOuter.hasTag(CLASS)) {
3361 Type site;
3362 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3363 if (clazz.hasTag(IDENT)) {
3364 site = env.enclClass.sym.type;
3365 } else if (clazz.hasTag(SELECT)) {
3366 site = ((JCFieldAccess) clazz).selected.type;
3367 } else throw new AssertionError(""+tree);
3368 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3369 if (site.hasTag(CLASS))
3370 site = types.asOuterSuper(site, clazzOuter.tsym);
3371 if (site == null)
3372 site = types.erasure(clazzOuter);
3373 clazzOuter = site;
3374 }
3375 }
3376 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3377 } else {
3378 if (formals.length() != 0) {
3379 log.error(tree.pos(), "wrong.number.type.args",
3380 Integer.toString(formals.length()));
3381 } else {
3382 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3383 }
3384 owntype = types.createErrorType(tree.type);
3385 }
3386 }
3387 result = check(tree, owntype, TYP, resultInfo);
3388 }
3390 public void visitTypeUnion(JCTypeUnion tree) {
3391 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3392 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3393 for (JCExpression typeTree : tree.alternatives) {
3394 Type ctype = attribType(typeTree, env);
3395 ctype = chk.checkType(typeTree.pos(),
3396 chk.checkClassType(typeTree.pos(), ctype),
3397 syms.throwableType);
3398 if (!ctype.isErroneous()) {
3399 //check that alternatives of a union type are pairwise
3400 //unrelated w.r.t. subtyping
3401 if (chk.intersects(ctype, multicatchTypes.toList())) {
3402 for (Type t : multicatchTypes) {
3403 boolean sub = types.isSubtype(ctype, t);
3404 boolean sup = types.isSubtype(t, ctype);
3405 if (sub || sup) {
3406 //assume 'a' <: 'b'
3407 Type a = sub ? ctype : t;
3408 Type b = sub ? t : ctype;
3409 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3410 }
3411 }
3412 }
3413 multicatchTypes.append(ctype);
3414 if (all_multicatchTypes != null)
3415 all_multicatchTypes.append(ctype);
3416 } else {
3417 if (all_multicatchTypes == null) {
3418 all_multicatchTypes = ListBuffer.lb();
3419 all_multicatchTypes.appendList(multicatchTypes);
3420 }
3421 all_multicatchTypes.append(ctype);
3422 }
3423 }
3424 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3425 if (t.hasTag(CLASS)) {
3426 List<Type> alternatives =
3427 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3428 t = new UnionClassType((ClassType) t, alternatives);
3429 }
3430 tree.type = result = t;
3431 }
3433 public void visitTypeParameter(JCTypeParameter tree) {
3434 TypeVar a = (TypeVar)tree.type;
3435 Set<Type> boundSet = new HashSet<Type>();
3436 if (a.bound.isErroneous())
3437 return;
3438 List<Type> bs = types.getBounds(a);
3439 if (tree.bounds.nonEmpty()) {
3440 // accept class or interface or typevar as first bound.
3441 Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false);
3442 boundSet.add(types.erasure(b));
3443 if (b.isErroneous()) {
3444 a.bound = b;
3445 }
3446 else if (b.hasTag(TYPEVAR)) {
3447 // if first bound was a typevar, do not accept further bounds.
3448 if (tree.bounds.tail.nonEmpty()) {
3449 log.error(tree.bounds.tail.head.pos(),
3450 "type.var.may.not.be.followed.by.other.bounds");
3451 tree.bounds = List.of(tree.bounds.head);
3452 a.bound = bs.head;
3453 }
3454 } else {
3455 // if first bound was a class or interface, accept only interfaces
3456 // as further bounds.
3457 for (JCExpression bound : tree.bounds.tail) {
3458 bs = bs.tail;
3459 Type i = checkBase(bs.head, bound, env, false, true, false);
3460 if (i.isErroneous())
3461 a.bound = i;
3462 else if (i.hasTag(CLASS))
3463 chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet);
3464 }
3465 }
3466 }
3467 bs = types.getBounds(a);
3469 // in case of multiple bounds ...
3470 if (bs.length() > 1) {
3471 // ... the variable's bound is a class type flagged COMPOUND
3472 // (see comment for TypeVar.bound).
3473 // In this case, generate a class tree that represents the
3474 // bound class, ...
3475 JCExpression extending;
3476 List<JCExpression> implementing;
3477 if ((bs.head.tsym.flags() & INTERFACE) == 0) {
3478 extending = tree.bounds.head;
3479 implementing = tree.bounds.tail;
3480 } else {
3481 extending = null;
3482 implementing = tree.bounds;
3483 }
3484 JCClassDecl cd = make.at(tree.pos).ClassDef(
3485 make.Modifiers(PUBLIC | ABSTRACT),
3486 tree.name, List.<JCTypeParameter>nil(),
3487 extending, implementing, List.<JCTree>nil());
3489 ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym;
3490 Assert.check((c.flags() & COMPOUND) != 0);
3491 cd.sym = c;
3492 c.sourcefile = env.toplevel.sourcefile;
3494 // ... and attribute the bound class
3495 c.flags_field |= UNATTRIBUTED;
3496 Env<AttrContext> cenv = enter.classEnv(cd, env);
3497 enter.typeEnvs.put(c, cenv);
3498 }
3499 }
3502 public void visitWildcard(JCWildcard tree) {
3503 //- System.err.println("visitWildcard("+tree+");");//DEBUG
3504 Type type = (tree.kind.kind == BoundKind.UNBOUND)
3505 ? syms.objectType
3506 : attribType(tree.inner, env);
3507 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
3508 tree.kind.kind,
3509 syms.boundClass),
3510 TYP, resultInfo);
3511 }
3513 public void visitAnnotation(JCAnnotation tree) {
3514 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
3515 result = tree.type = syms.errType;
3516 }
3518 public void visitErroneous(JCErroneous tree) {
3519 if (tree.errs != null)
3520 for (JCTree err : tree.errs)
3521 attribTree(err, env, new ResultInfo(ERR, pt()));
3522 result = tree.type = syms.errType;
3523 }
3525 /** Default visitor method for all other trees.
3526 */
3527 public void visitTree(JCTree tree) {
3528 throw new AssertionError();
3529 }
3531 /**
3532 * Attribute an env for either a top level tree or class declaration.
3533 */
3534 public void attrib(Env<AttrContext> env) {
3535 if (env.tree.hasTag(TOPLEVEL))
3536 attribTopLevel(env);
3537 else
3538 attribClass(env.tree.pos(), env.enclClass.sym);
3539 }
3541 /**
3542 * Attribute a top level tree. These trees are encountered when the
3543 * package declaration has annotations.
3544 */
3545 public void attribTopLevel(Env<AttrContext> env) {
3546 JCCompilationUnit toplevel = env.toplevel;
3547 try {
3548 annotate.flush();
3549 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
3550 } catch (CompletionFailure ex) {
3551 chk.completionError(toplevel.pos(), ex);
3552 }
3553 }
3555 /** Main method: attribute class definition associated with given class symbol.
3556 * reporting completion failures at the given position.
3557 * @param pos The source position at which completion errors are to be
3558 * reported.
3559 * @param c The class symbol whose definition will be attributed.
3560 */
3561 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
3562 try {
3563 annotate.flush();
3564 attribClass(c);
3565 } catch (CompletionFailure ex) {
3566 chk.completionError(pos, ex);
3567 }
3568 }
3570 /** Attribute class definition associated with given class symbol.
3571 * @param c The class symbol whose definition will be attributed.
3572 */
3573 void attribClass(ClassSymbol c) throws CompletionFailure {
3574 if (c.type.hasTag(ERROR)) return;
3576 // Check for cycles in the inheritance graph, which can arise from
3577 // ill-formed class files.
3578 chk.checkNonCyclic(null, c.type);
3580 Type st = types.supertype(c.type);
3581 if ((c.flags_field & Flags.COMPOUND) == 0) {
3582 // First, attribute superclass.
3583 if (st.hasTag(CLASS))
3584 attribClass((ClassSymbol)st.tsym);
3586 // Next attribute owner, if it is a class.
3587 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
3588 attribClass((ClassSymbol)c.owner);
3589 }
3591 // The previous operations might have attributed the current class
3592 // if there was a cycle. So we test first whether the class is still
3593 // UNATTRIBUTED.
3594 if ((c.flags_field & UNATTRIBUTED) != 0) {
3595 c.flags_field &= ~UNATTRIBUTED;
3597 // Get environment current at the point of class definition.
3598 Env<AttrContext> env = enter.typeEnvs.get(c);
3600 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
3601 // because the annotations were not available at the time the env was created. Therefore,
3602 // we look up the environment chain for the first enclosing environment for which the
3603 // lint value is set. Typically, this is the parent env, but might be further if there
3604 // are any envs created as a result of TypeParameter nodes.
3605 Env<AttrContext> lintEnv = env;
3606 while (lintEnv.info.lint == null)
3607 lintEnv = lintEnv.next;
3609 // Having found the enclosing lint value, we can initialize the lint value for this class
3610 env.info.lint = lintEnv.info.lint.augment(c.annotations, c.flags());
3612 Lint prevLint = chk.setLint(env.info.lint);
3613 JavaFileObject prev = log.useSource(c.sourcefile);
3614 ResultInfo prevReturnRes = env.info.returnResult;
3616 try {
3617 env.info.returnResult = null;
3618 // java.lang.Enum may not be subclassed by a non-enum
3619 if (st.tsym == syms.enumSym &&
3620 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
3621 log.error(env.tree.pos(), "enum.no.subclassing");
3623 // Enums may not be extended by source-level classes
3624 if (st.tsym != null &&
3625 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
3626 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
3627 !target.compilerBootstrap(c)) {
3628 log.error(env.tree.pos(), "enum.types.not.extensible");
3629 }
3630 attribClassBody(env, c);
3632 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
3633 } finally {
3634 env.info.returnResult = prevReturnRes;
3635 log.useSource(prev);
3636 chk.setLint(prevLint);
3637 }
3639 }
3640 }
3642 public void visitImport(JCImport tree) {
3643 // nothing to do
3644 }
3646 /** Finish the attribution of a class. */
3647 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
3648 JCClassDecl tree = (JCClassDecl)env.tree;
3649 Assert.check(c == tree.sym);
3651 // Validate annotations
3652 chk.validateAnnotations(tree.mods.annotations, c);
3654 // Validate type parameters, supertype and interfaces.
3655 attribBounds(tree.typarams);
3656 if (!c.isAnonymous()) {
3657 //already checked if anonymous
3658 chk.validate(tree.typarams, env);
3659 chk.validate(tree.extending, env);
3660 chk.validate(tree.implementing, env);
3661 }
3663 // If this is a non-abstract class, check that it has no abstract
3664 // methods or unimplemented methods of an implemented interface.
3665 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
3666 if (!relax)
3667 chk.checkAllDefined(tree.pos(), c);
3668 }
3670 if ((c.flags() & ANNOTATION) != 0) {
3671 if (tree.implementing.nonEmpty())
3672 log.error(tree.implementing.head.pos(),
3673 "cant.extend.intf.annotation");
3674 if (tree.typarams.nonEmpty())
3675 log.error(tree.typarams.head.pos(),
3676 "intf.annotation.cant.have.type.params");
3678 // If this annotation has a @ContainedBy, validate
3679 Attribute.Compound containedBy = c.attribute(syms.containedByType.tsym);
3680 if (containedBy != null) {
3681 // get diagnositc position for error reporting
3682 DiagnosticPosition cbPos = getDiagnosticPosition(tree, containedBy.type);
3683 Assert.checkNonNull(cbPos);
3685 chk.validateContainedBy(c, containedBy, cbPos);
3686 }
3688 // If this annotation has a @ContainerFor, validate
3689 Attribute.Compound containerFor = c.attribute(syms.containerForType.tsym);
3690 if (containerFor != null) {
3691 // get diagnositc position for error reporting
3692 DiagnosticPosition cfPos = getDiagnosticPosition(tree, containerFor.type);
3693 Assert.checkNonNull(cfPos);
3695 chk.validateContainerFor(c, containerFor, cfPos);
3696 }
3697 } else {
3698 // Check that all extended classes and interfaces
3699 // are compatible (i.e. no two define methods with same arguments
3700 // yet different return types). (JLS 8.4.6.3)
3701 chk.checkCompatibleSupertypes(tree.pos(), c.type);
3702 }
3704 // Check that class does not import the same parameterized interface
3705 // with two different argument lists.
3706 chk.checkClassBounds(tree.pos(), c.type);
3708 tree.type = c.type;
3710 for (List<JCTypeParameter> l = tree.typarams;
3711 l.nonEmpty(); l = l.tail) {
3712 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
3713 }
3715 // Check that a generic class doesn't extend Throwable
3716 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
3717 log.error(tree.extending.pos(), "generic.throwable");
3719 // Check that all methods which implement some
3720 // method conform to the method they implement.
3721 chk.checkImplementations(tree);
3723 //check that a resource implementing AutoCloseable cannot throw InterruptedException
3724 checkAutoCloseable(tree.pos(), env, c.type);
3726 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
3727 // Attribute declaration
3728 attribStat(l.head, env);
3729 // Check that declarations in inner classes are not static (JLS 8.1.2)
3730 // Make an exception for static constants.
3731 if (c.owner.kind != PCK &&
3732 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
3733 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
3734 Symbol sym = null;
3735 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
3736 if (sym == null ||
3737 sym.kind != VAR ||
3738 ((VarSymbol) sym).getConstValue() == null)
3739 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
3740 }
3741 }
3743 // Check for cycles among non-initial constructors.
3744 chk.checkCyclicConstructors(tree);
3746 // Check for cycles among annotation elements.
3747 chk.checkNonCyclicElements(tree);
3749 // Check for proper use of serialVersionUID
3750 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
3751 isSerializable(c) &&
3752 (c.flags() & Flags.ENUM) == 0 &&
3753 (c.flags() & ABSTRACT) == 0) {
3754 checkSerialVersionUID(tree, c);
3755 }
3756 }
3757 // where
3758 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
3759 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
3760 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
3761 if (types.isSameType(al.head.annotationType.type, t))
3762 return al.head.pos();
3763 }
3765 return null;
3766 }
3768 /** check if a class is a subtype of Serializable, if that is available. */
3769 private boolean isSerializable(ClassSymbol c) {
3770 try {
3771 syms.serializableType.complete();
3772 }
3773 catch (CompletionFailure e) {
3774 return false;
3775 }
3776 return types.isSubtype(c.type, syms.serializableType);
3777 }
3779 /** Check that an appropriate serialVersionUID member is defined. */
3780 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
3782 // check for presence of serialVersionUID
3783 Scope.Entry e = c.members().lookup(names.serialVersionUID);
3784 while (e.scope != null && e.sym.kind != VAR) e = e.next();
3785 if (e.scope == null) {
3786 log.warning(LintCategory.SERIAL,
3787 tree.pos(), "missing.SVUID", c);
3788 return;
3789 }
3791 // check that it is static final
3792 VarSymbol svuid = (VarSymbol)e.sym;
3793 if ((svuid.flags() & (STATIC | FINAL)) !=
3794 (STATIC | FINAL))
3795 log.warning(LintCategory.SERIAL,
3796 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
3798 // check that it is long
3799 else if (!svuid.type.hasTag(LONG))
3800 log.warning(LintCategory.SERIAL,
3801 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
3803 // check constant
3804 else if (svuid.getConstValue() == null)
3805 log.warning(LintCategory.SERIAL,
3806 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
3807 }
3809 private Type capture(Type type) {
3810 return types.capture(type);
3811 }
3813 // <editor-fold desc="post-attribution visitor">
3815 /**
3816 * Handle missing types/symbols in an AST. This routine is useful when
3817 * the compiler has encountered some errors (which might have ended up
3818 * terminating attribution abruptly); if the compiler is used in fail-over
3819 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
3820 * prevents NPE to be progagated during subsequent compilation steps.
3821 */
3822 public void postAttr(JCTree tree) {
3823 new PostAttrAnalyzer().scan(tree);
3824 }
3826 class PostAttrAnalyzer extends TreeScanner {
3828 private void initTypeIfNeeded(JCTree that) {
3829 if (that.type == null) {
3830 that.type = syms.unknownType;
3831 }
3832 }
3834 @Override
3835 public void scan(JCTree tree) {
3836 if (tree == null) return;
3837 if (tree instanceof JCExpression) {
3838 initTypeIfNeeded(tree);
3839 }
3840 super.scan(tree);
3841 }
3843 @Override
3844 public void visitIdent(JCIdent that) {
3845 if (that.sym == null) {
3846 that.sym = syms.unknownSymbol;
3847 }
3848 }
3850 @Override
3851 public void visitSelect(JCFieldAccess that) {
3852 if (that.sym == null) {
3853 that.sym = syms.unknownSymbol;
3854 }
3855 super.visitSelect(that);
3856 }
3858 @Override
3859 public void visitClassDef(JCClassDecl that) {
3860 initTypeIfNeeded(that);
3861 if (that.sym == null) {
3862 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
3863 }
3864 super.visitClassDef(that);
3865 }
3867 @Override
3868 public void visitMethodDef(JCMethodDecl that) {
3869 initTypeIfNeeded(that);
3870 if (that.sym == null) {
3871 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
3872 }
3873 super.visitMethodDef(that);
3874 }
3876 @Override
3877 public void visitVarDef(JCVariableDecl that) {
3878 initTypeIfNeeded(that);
3879 if (that.sym == null) {
3880 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
3881 that.sym.adr = 0;
3882 }
3883 super.visitVarDef(that);
3884 }
3886 @Override
3887 public void visitNewClass(JCNewClass that) {
3888 if (that.constructor == null) {
3889 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
3890 }
3891 if (that.constructorType == null) {
3892 that.constructorType = syms.unknownType;
3893 }
3894 super.visitNewClass(that);
3895 }
3897 @Override
3898 public void visitAssignop(JCAssignOp that) {
3899 if (that.operator == null)
3900 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
3901 super.visitAssignop(that);
3902 }
3904 @Override
3905 public void visitBinary(JCBinary that) {
3906 if (that.operator == null)
3907 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
3908 super.visitBinary(that);
3909 }
3911 @Override
3912 public void visitUnary(JCUnary that) {
3913 if (that.operator == null)
3914 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
3915 super.visitUnary(that);
3916 }
3918 @Override
3919 public void visitReference(JCMemberReference that) {
3920 super.visitReference(that);
3921 if (that.sym == null) {
3922 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
3923 }
3924 }
3925 }
3926 // </editor-fold>
3927 }
