Mon, 09 Sep 2013 23:13:45 +0200
8019521: Enhanced rethrow disabled in lambdas
Summary: Fixing effectively final detection inside lambdas, small cleanup related to thrown types detection in lambdas
Reviewed-by: mcimadamore, jjg
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
34 import com.sun.source.tree.IdentifierTree;
35 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
36 import com.sun.source.tree.MemberSelectTree;
37 import com.sun.source.tree.TreeVisitor;
38 import com.sun.source.util.SimpleTreeVisitor;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.code.Type.*;
43 import com.sun.tools.javac.comp.Check.CheckContext;
44 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
45 import com.sun.tools.javac.comp.Infer.InferenceContext;
46 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.tree.*;
49 import com.sun.tools.javac.tree.JCTree.*;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
53 import com.sun.tools.javac.util.List;
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Flags.ANNOTATION;
56 import static com.sun.tools.javac.code.Flags.BLOCK;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
59 import static com.sun.tools.javac.code.TypeTag.*;
60 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
61 import static com.sun.tools.javac.tree.JCTree.Tag.*;
63 /** This is the main context-dependent analysis phase in GJC. It
64 * encompasses name resolution, type checking and constant folding as
65 * subtasks. Some subtasks involve auxiliary classes.
66 * @see Check
67 * @see Resolve
68 * @see ConstFold
69 * @see Infer
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Attr extends JCTree.Visitor {
77 protected static final Context.Key<Attr> attrKey =
78 new Context.Key<Attr>();
80 final Names names;
81 final Log log;
82 final Symtab syms;
83 final Resolve rs;
84 final Infer infer;
85 final DeferredAttr deferredAttr;
86 final Check chk;
87 final Flow flow;
88 final MemberEnter memberEnter;
89 final TreeMaker make;
90 final ConstFold cfolder;
91 final Enter enter;
92 final Target target;
93 final Types types;
94 final JCDiagnostic.Factory diags;
95 final Annotate annotate;
96 final DeferredLintHandler deferredLintHandler;
98 public static Attr instance(Context context) {
99 Attr instance = context.get(attrKey);
100 if (instance == null)
101 instance = new Attr(context);
102 return instance;
103 }
105 protected Attr(Context context) {
106 context.put(attrKey, this);
108 names = Names.instance(context);
109 log = Log.instance(context);
110 syms = Symtab.instance(context);
111 rs = Resolve.instance(context);
112 chk = Check.instance(context);
113 flow = Flow.instance(context);
114 memberEnter = MemberEnter.instance(context);
115 make = TreeMaker.instance(context);
116 enter = Enter.instance(context);
117 infer = Infer.instance(context);
118 deferredAttr = DeferredAttr.instance(context);
119 cfolder = ConstFold.instance(context);
120 target = Target.instance(context);
121 types = Types.instance(context);
122 diags = JCDiagnostic.Factory.instance(context);
123 annotate = Annotate.instance(context);
124 deferredLintHandler = DeferredLintHandler.instance(context);
126 Options options = Options.instance(context);
128 Source source = Source.instance(context);
129 allowGenerics = source.allowGenerics();
130 allowVarargs = source.allowVarargs();
131 allowEnums = source.allowEnums();
132 allowBoxing = source.allowBoxing();
133 allowCovariantReturns = source.allowCovariantReturns();
134 allowAnonOuterThis = source.allowAnonOuterThis();
135 allowStringsInSwitch = source.allowStringsInSwitch();
136 allowPoly = source.allowPoly();
137 allowTypeAnnos = source.allowTypeAnnotations();
138 allowLambda = source.allowLambda();
139 allowDefaultMethods = source.allowDefaultMethods();
140 sourceName = source.name;
141 relax = (options.isSet("-retrofit") ||
142 options.isSet("-relax"));
143 findDiamonds = options.get("findDiamond") != null &&
144 source.allowDiamond();
145 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
146 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
148 statInfo = new ResultInfo(NIL, Type.noType);
149 varInfo = new ResultInfo(VAR, Type.noType);
150 unknownExprInfo = new ResultInfo(VAL, Type.noType);
151 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
152 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
153 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
154 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
155 }
157 /** Switch: relax some constraints for retrofit mode.
158 */
159 boolean relax;
161 /** Switch: support target-typing inference
162 */
163 boolean allowPoly;
165 /** Switch: support type annotations.
166 */
167 boolean allowTypeAnnos;
169 /** Switch: support generics?
170 */
171 boolean allowGenerics;
173 /** Switch: allow variable-arity methods.
174 */
175 boolean allowVarargs;
177 /** Switch: support enums?
178 */
179 boolean allowEnums;
181 /** Switch: support boxing and unboxing?
182 */
183 boolean allowBoxing;
185 /** Switch: support covariant result types?
186 */
187 boolean allowCovariantReturns;
189 /** Switch: support lambda expressions ?
190 */
191 boolean allowLambda;
193 /** Switch: support default methods ?
194 */
195 boolean allowDefaultMethods;
197 /** Switch: allow references to surrounding object from anonymous
198 * objects during constructor call?
199 */
200 boolean allowAnonOuterThis;
202 /** Switch: generates a warning if diamond can be safely applied
203 * to a given new expression
204 */
205 boolean findDiamonds;
207 /**
208 * Internally enables/disables diamond finder feature
209 */
210 static final boolean allowDiamondFinder = true;
212 /**
213 * Switch: warn about use of variable before declaration?
214 * RFE: 6425594
215 */
216 boolean useBeforeDeclarationWarning;
218 /**
219 * Switch: generate warnings whenever an anonymous inner class that is convertible
220 * to a lambda expression is found
221 */
222 boolean identifyLambdaCandidate;
224 /**
225 * Switch: allow strings in switch?
226 */
227 boolean allowStringsInSwitch;
229 /**
230 * Switch: name of source level; used for error reporting.
231 */
232 String sourceName;
234 /** Check kind and type of given tree against protokind and prototype.
235 * If check succeeds, store type in tree and return it.
236 * If check fails, store errType in tree and return it.
237 * No checks are performed if the prototype is a method type.
238 * It is not necessary in this case since we know that kind and type
239 * are correct.
240 *
241 * @param tree The tree whose kind and type is checked
242 * @param ownkind The computed kind of the tree
243 * @param resultInfo The expected result of the tree
244 */
245 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
246 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
247 Type owntype = found;
248 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
249 if (allowPoly && inferenceContext.free(found)) {
250 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
251 @Override
252 public void typesInferred(InferenceContext inferenceContext) {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 }
257 });
258 return tree.type = resultInfo.pt;
259 } else {
260 if ((ownkind & ~resultInfo.pkind) == 0) {
261 owntype = resultInfo.check(tree, owntype);
262 } else {
263 log.error(tree.pos(), "unexpected.type",
264 kindNames(resultInfo.pkind),
265 kindName(ownkind));
266 owntype = types.createErrorType(owntype);
267 }
268 }
269 }
270 tree.type = owntype;
271 return owntype;
272 }
274 /** Is given blank final variable assignable, i.e. in a scope where it
275 * may be assigned to even though it is final?
276 * @param v The blank final variable.
277 * @param env The current environment.
278 */
279 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
280 Symbol owner = owner(env);
281 // owner refers to the innermost variable, method or
282 // initializer block declaration at this point.
283 return
284 v.owner == owner
285 ||
286 ((owner.name == names.init || // i.e. we are in a constructor
287 owner.kind == VAR || // i.e. we are in a variable initializer
288 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
289 &&
290 v.owner == owner.owner
291 &&
292 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
293 }
295 /**
296 * Return the innermost enclosing owner symbol in a given attribution context
297 */
298 Symbol owner(Env<AttrContext> env) {
299 while (true) {
300 switch (env.tree.getTag()) {
301 case VARDEF:
302 //a field can be owner
303 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
304 if (vsym.owner.kind == TYP) {
305 return vsym;
306 }
307 break;
308 case METHODDEF:
309 //method def is always an owner
310 return ((JCMethodDecl)env.tree).sym;
311 case CLASSDEF:
312 //class def is always an owner
313 return ((JCClassDecl)env.tree).sym;
314 case LAMBDA:
315 //a lambda is an owner - return a fresh synthetic method symbol
316 return new MethodSymbol(0, names.empty, null, syms.methodClass);
317 case BLOCK:
318 //static/instance init blocks are owner
319 Symbol blockSym = env.info.scope.owner;
320 if ((blockSym.flags() & BLOCK) != 0) {
321 return blockSym;
322 }
323 break;
324 case TOPLEVEL:
325 //toplevel is always an owner (for pkge decls)
326 return env.info.scope.owner;
327 }
328 Assert.checkNonNull(env.next);
329 env = env.next;
330 }
331 }
333 /** Check that variable can be assigned to.
334 * @param pos The current source code position.
335 * @param v The assigned varaible
336 * @param base If the variable is referred to in a Select, the part
337 * to the left of the `.', null otherwise.
338 * @param env The current environment.
339 */
340 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
341 if ((v.flags() & FINAL) != 0 &&
342 ((v.flags() & HASINIT) != 0
343 ||
344 !((base == null ||
345 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
346 isAssignableAsBlankFinal(v, env)))) {
347 if (v.isResourceVariable()) { //TWR resource
348 log.error(pos, "try.resource.may.not.be.assigned", v);
349 } else {
350 log.error(pos, "cant.assign.val.to.final.var", v);
351 }
352 }
353 }
355 /** Does tree represent a static reference to an identifier?
356 * It is assumed that tree is either a SELECT or an IDENT.
357 * We have to weed out selects from non-type names here.
358 * @param tree The candidate tree.
359 */
360 boolean isStaticReference(JCTree tree) {
361 if (tree.hasTag(SELECT)) {
362 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
363 if (lsym == null || lsym.kind != TYP) {
364 return false;
365 }
366 }
367 return true;
368 }
370 /** Is this symbol a type?
371 */
372 static boolean isType(Symbol sym) {
373 return sym != null && sym.kind == TYP;
374 }
376 /** The current `this' symbol.
377 * @param env The current environment.
378 */
379 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
380 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
381 }
383 /** Attribute a parsed identifier.
384 * @param tree Parsed identifier name
385 * @param topLevel The toplevel to use
386 */
387 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
388 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
389 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
390 syms.errSymbol.name,
391 null, null, null, null);
392 localEnv.enclClass.sym = syms.errSymbol;
393 return tree.accept(identAttributer, localEnv);
394 }
395 // where
396 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
397 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
398 @Override
399 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
400 Symbol site = visit(node.getExpression(), env);
401 if (site.kind == ERR || site.kind == ABSENT_TYP)
402 return site;
403 Name name = (Name)node.getIdentifier();
404 if (site.kind == PCK) {
405 env.toplevel.packge = (PackageSymbol)site;
406 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
407 } else {
408 env.enclClass.sym = (ClassSymbol)site;
409 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
410 }
411 }
413 @Override
414 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
415 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
416 }
417 }
419 public Type coerce(Type etype, Type ttype) {
420 return cfolder.coerce(etype, ttype);
421 }
423 public Type attribType(JCTree node, TypeSymbol sym) {
424 Env<AttrContext> env = enter.typeEnvs.get(sym);
425 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
426 return attribTree(node, localEnv, unknownTypeInfo);
427 }
429 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
430 // Attribute qualifying package or class.
431 JCFieldAccess s = (JCFieldAccess)tree.qualid;
432 return attribTree(s.selected,
433 env,
434 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
435 Type.noType));
436 }
438 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
439 breakTree = tree;
440 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
441 try {
442 attribExpr(expr, env);
443 } catch (BreakAttr b) {
444 return b.env;
445 } catch (AssertionError ae) {
446 if (ae.getCause() instanceof BreakAttr) {
447 return ((BreakAttr)(ae.getCause())).env;
448 } else {
449 throw ae;
450 }
451 } finally {
452 breakTree = null;
453 log.useSource(prev);
454 }
455 return env;
456 }
458 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
459 breakTree = tree;
460 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
461 try {
462 attribStat(stmt, env);
463 } catch (BreakAttr b) {
464 return b.env;
465 } catch (AssertionError ae) {
466 if (ae.getCause() instanceof BreakAttr) {
467 return ((BreakAttr)(ae.getCause())).env;
468 } else {
469 throw ae;
470 }
471 } finally {
472 breakTree = null;
473 log.useSource(prev);
474 }
475 return env;
476 }
478 private JCTree breakTree = null;
480 private static class BreakAttr extends RuntimeException {
481 static final long serialVersionUID = -6924771130405446405L;
482 private Env<AttrContext> env;
483 private BreakAttr(Env<AttrContext> env) {
484 this.env = env;
485 }
486 }
488 class ResultInfo {
489 final int pkind;
490 final Type pt;
491 final CheckContext checkContext;
493 ResultInfo(int pkind, Type pt) {
494 this(pkind, pt, chk.basicHandler);
495 }
497 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
498 this.pkind = pkind;
499 this.pt = pt;
500 this.checkContext = checkContext;
501 }
503 protected Type check(final DiagnosticPosition pos, final Type found) {
504 return chk.checkType(pos, found, pt, checkContext);
505 }
507 protected ResultInfo dup(Type newPt) {
508 return new ResultInfo(pkind, newPt, checkContext);
509 }
511 protected ResultInfo dup(CheckContext newContext) {
512 return new ResultInfo(pkind, pt, newContext);
513 }
514 }
516 class RecoveryInfo extends ResultInfo {
518 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
519 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
520 @Override
521 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
522 return deferredAttrContext;
523 }
524 @Override
525 public boolean compatible(Type found, Type req, Warner warn) {
526 return true;
527 }
528 @Override
529 public void report(DiagnosticPosition pos, JCDiagnostic details) {
530 chk.basicHandler.report(pos, details);
531 }
532 });
533 }
534 }
536 final ResultInfo statInfo;
537 final ResultInfo varInfo;
538 final ResultInfo unknownAnyPolyInfo;
539 final ResultInfo unknownExprInfo;
540 final ResultInfo unknownTypeInfo;
541 final ResultInfo unknownTypeExprInfo;
542 final ResultInfo recoveryInfo;
544 Type pt() {
545 return resultInfo.pt;
546 }
548 int pkind() {
549 return resultInfo.pkind;
550 }
552 /* ************************************************************************
553 * Visitor methods
554 *************************************************************************/
556 /** Visitor argument: the current environment.
557 */
558 Env<AttrContext> env;
560 /** Visitor argument: the currently expected attribution result.
561 */
562 ResultInfo resultInfo;
564 /** Visitor result: the computed type.
565 */
566 Type result;
568 /** Visitor method: attribute a tree, catching any completion failure
569 * exceptions. Return the tree's type.
570 *
571 * @param tree The tree to be visited.
572 * @param env The environment visitor argument.
573 * @param resultInfo The result info visitor argument.
574 */
575 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
576 Env<AttrContext> prevEnv = this.env;
577 ResultInfo prevResult = this.resultInfo;
578 try {
579 this.env = env;
580 this.resultInfo = resultInfo;
581 tree.accept(this);
582 if (tree == breakTree &&
583 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
584 throw new BreakAttr(copyEnv(env));
585 }
586 return result;
587 } catch (CompletionFailure ex) {
588 tree.type = syms.errType;
589 return chk.completionError(tree.pos(), ex);
590 } finally {
591 this.env = prevEnv;
592 this.resultInfo = prevResult;
593 }
594 }
596 Env<AttrContext> copyEnv(Env<AttrContext> env) {
597 Env<AttrContext> newEnv =
598 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
599 if (newEnv.outer != null) {
600 newEnv.outer = copyEnv(newEnv.outer);
601 }
602 return newEnv;
603 }
605 Scope copyScope(Scope sc) {
606 Scope newScope = new Scope(sc.owner);
607 List<Symbol> elemsList = List.nil();
608 while (sc != null) {
609 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
610 elemsList = elemsList.prepend(e.sym);
611 }
612 sc = sc.next;
613 }
614 for (Symbol s : elemsList) {
615 newScope.enter(s);
616 }
617 return newScope;
618 }
620 /** Derived visitor method: attribute an expression tree.
621 */
622 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
623 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
624 }
626 /** Derived visitor method: attribute an expression tree with
627 * no constraints on the computed type.
628 */
629 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
630 return attribTree(tree, env, unknownExprInfo);
631 }
633 /** Derived visitor method: attribute a type tree.
634 */
635 public Type attribType(JCTree tree, Env<AttrContext> env) {
636 Type result = attribType(tree, env, Type.noType);
637 return result;
638 }
640 /** Derived visitor method: attribute a type tree.
641 */
642 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
643 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
644 return result;
645 }
647 /** Derived visitor method: attribute a statement or definition tree.
648 */
649 public Type attribStat(JCTree tree, Env<AttrContext> env) {
650 return attribTree(tree, env, statInfo);
651 }
653 /** Attribute a list of expressions, returning a list of types.
654 */
655 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
656 ListBuffer<Type> ts = new ListBuffer<Type>();
657 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
658 ts.append(attribExpr(l.head, env, pt));
659 return ts.toList();
660 }
662 /** Attribute a list of statements, returning nothing.
663 */
664 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
665 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
666 attribStat(l.head, env);
667 }
669 /** Attribute the arguments in a method call, returning the method kind.
670 */
671 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
672 int kind = VAL;
673 for (JCExpression arg : trees) {
674 Type argtype;
675 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
676 argtype = deferredAttr.new DeferredType(arg, env);
677 kind |= POLY;
678 } else {
679 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
680 }
681 argtypes.append(argtype);
682 }
683 return kind;
684 }
686 /** Attribute a type argument list, returning a list of types.
687 * Caller is responsible for calling checkRefTypes.
688 */
689 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
690 ListBuffer<Type> argtypes = new ListBuffer<Type>();
691 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
692 argtypes.append(attribType(l.head, env));
693 return argtypes.toList();
694 }
696 /** Attribute a type argument list, returning a list of types.
697 * Check that all the types are references.
698 */
699 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
700 List<Type> types = attribAnyTypes(trees, env);
701 return chk.checkRefTypes(trees, types);
702 }
704 /**
705 * Attribute type variables (of generic classes or methods).
706 * Compound types are attributed later in attribBounds.
707 * @param typarams the type variables to enter
708 * @param env the current environment
709 */
710 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
711 for (JCTypeParameter tvar : typarams) {
712 TypeVar a = (TypeVar)tvar.type;
713 a.tsym.flags_field |= UNATTRIBUTED;
714 a.bound = Type.noType;
715 if (!tvar.bounds.isEmpty()) {
716 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
717 for (JCExpression bound : tvar.bounds.tail)
718 bounds = bounds.prepend(attribType(bound, env));
719 types.setBounds(a, bounds.reverse());
720 } else {
721 // if no bounds are given, assume a single bound of
722 // java.lang.Object.
723 types.setBounds(a, List.of(syms.objectType));
724 }
725 a.tsym.flags_field &= ~UNATTRIBUTED;
726 }
727 for (JCTypeParameter tvar : typarams) {
728 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
729 }
730 }
732 /**
733 * Attribute the type references in a list of annotations.
734 */
735 void attribAnnotationTypes(List<JCAnnotation> annotations,
736 Env<AttrContext> env) {
737 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
738 JCAnnotation a = al.head;
739 attribType(a.annotationType, env);
740 }
741 }
743 /**
744 * Attribute a "lazy constant value".
745 * @param env The env for the const value
746 * @param initializer The initializer for the const value
747 * @param type The expected type, or null
748 * @see VarSymbol#setLazyConstValue
749 */
750 public Object attribLazyConstantValue(Env<AttrContext> env,
751 JCTree.JCExpression initializer,
752 Type type) {
754 /* When this env was created, it didn't have the correct lint nor had
755 * annotations has been processed.
756 * But now at this phase we have already processed annotations and the
757 * correct lint must have been set in chk, so we should use that one to
758 * attribute the initializer.
759 */
760 Lint prevLint = env.info.lint;
761 env.info.lint = chk.getLint();
763 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
765 try {
766 // Use null as symbol to not attach the type annotation to any symbol.
767 // The initializer will later also be visited and then we'll attach
768 // to the symbol.
769 // This prevents having multiple type annotations, just because of
770 // lazy constant value evaluation.
771 memberEnter.typeAnnotate(initializer, env, null);
772 annotate.flush();
773 Type itype = attribExpr(initializer, env, type);
774 if (itype.constValue() != null) {
775 return coerce(itype, type).constValue();
776 } else {
777 return null;
778 }
779 } finally {
780 env.info.lint = prevLint;
781 log.useSource(prevSource);
782 }
783 }
785 /** Attribute type reference in an `extends' or `implements' clause.
786 * Supertypes of anonymous inner classes are usually already attributed.
787 *
788 * @param tree The tree making up the type reference.
789 * @param env The environment current at the reference.
790 * @param classExpected true if only a class is expected here.
791 * @param interfaceExpected true if only an interface is expected here.
792 */
793 Type attribBase(JCTree tree,
794 Env<AttrContext> env,
795 boolean classExpected,
796 boolean interfaceExpected,
797 boolean checkExtensible) {
798 Type t = tree.type != null ?
799 tree.type :
800 attribType(tree, env);
801 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
802 }
803 Type checkBase(Type t,
804 JCTree tree,
805 Env<AttrContext> env,
806 boolean classExpected,
807 boolean interfaceExpected,
808 boolean checkExtensible) {
809 if (t.isErroneous())
810 return t;
811 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
812 // check that type variable is already visible
813 if (t.getUpperBound() == null) {
814 log.error(tree.pos(), "illegal.forward.ref");
815 return types.createErrorType(t);
816 }
817 } else {
818 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
819 }
820 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
821 log.error(tree.pos(), "intf.expected.here");
822 // return errType is necessary since otherwise there might
823 // be undetected cycles which cause attribution to loop
824 return types.createErrorType(t);
825 } else if (checkExtensible &&
826 classExpected &&
827 (t.tsym.flags() & INTERFACE) != 0) {
828 log.error(tree.pos(), "no.intf.expected.here");
829 return types.createErrorType(t);
830 }
831 if (checkExtensible &&
832 ((t.tsym.flags() & FINAL) != 0)) {
833 log.error(tree.pos(),
834 "cant.inherit.from.final", t.tsym);
835 }
836 chk.checkNonCyclic(tree.pos(), t);
837 return t;
838 }
840 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
841 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
842 id.type = env.info.scope.owner.type;
843 id.sym = env.info.scope.owner;
844 return id.type;
845 }
847 public void visitClassDef(JCClassDecl tree) {
848 // Local classes have not been entered yet, so we need to do it now:
849 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
850 enter.classEnter(tree, env);
852 ClassSymbol c = tree.sym;
853 if (c == null) {
854 // exit in case something drastic went wrong during enter.
855 result = null;
856 } else {
857 // make sure class has been completed:
858 c.complete();
860 // If this class appears as an anonymous class
861 // in a superclass constructor call where
862 // no explicit outer instance is given,
863 // disable implicit outer instance from being passed.
864 // (This would be an illegal access to "this before super").
865 if (env.info.isSelfCall &&
866 env.tree.hasTag(NEWCLASS) &&
867 ((JCNewClass) env.tree).encl == null)
868 {
869 c.flags_field |= NOOUTERTHIS;
870 }
871 attribClass(tree.pos(), c);
872 result = tree.type = c.type;
873 }
874 }
876 public void visitMethodDef(JCMethodDecl tree) {
877 MethodSymbol m = tree.sym;
878 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
880 Lint lint = env.info.lint.augment(m);
881 Lint prevLint = chk.setLint(lint);
882 MethodSymbol prevMethod = chk.setMethod(m);
883 try {
884 deferredLintHandler.flush(tree.pos());
885 chk.checkDeprecatedAnnotation(tree.pos(), m);
888 // Create a new environment with local scope
889 // for attributing the method.
890 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
891 localEnv.info.lint = lint;
893 attribStats(tree.typarams, localEnv);
895 // If we override any other methods, check that we do so properly.
896 // JLS ???
897 if (m.isStatic()) {
898 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
899 } else {
900 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
901 }
902 chk.checkOverride(tree, m);
904 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
905 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
906 }
908 // Enter all type parameters into the local method scope.
909 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
910 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
912 ClassSymbol owner = env.enclClass.sym;
913 if ((owner.flags() & ANNOTATION) != 0 &&
914 tree.params.nonEmpty())
915 log.error(tree.params.head.pos(),
916 "intf.annotation.members.cant.have.params");
918 // Attribute all value parameters.
919 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
920 attribStat(l.head, localEnv);
921 }
923 chk.checkVarargsMethodDecl(localEnv, tree);
925 // Check that type parameters are well-formed.
926 chk.validate(tree.typarams, localEnv);
928 // Check that result type is well-formed.
929 chk.validate(tree.restype, localEnv);
931 // Check that receiver type is well-formed.
932 if (tree.recvparam != null) {
933 // Use a new environment to check the receiver parameter.
934 // Otherwise I get "might not have been initialized" errors.
935 // Is there a better way?
936 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
937 attribType(tree.recvparam, newEnv);
938 chk.validate(tree.recvparam, newEnv);
939 }
941 // annotation method checks
942 if ((owner.flags() & ANNOTATION) != 0) {
943 // annotation method cannot have throws clause
944 if (tree.thrown.nonEmpty()) {
945 log.error(tree.thrown.head.pos(),
946 "throws.not.allowed.in.intf.annotation");
947 }
948 // annotation method cannot declare type-parameters
949 if (tree.typarams.nonEmpty()) {
950 log.error(tree.typarams.head.pos(),
951 "intf.annotation.members.cant.have.type.params");
952 }
953 // validate annotation method's return type (could be an annotation type)
954 chk.validateAnnotationType(tree.restype);
955 // ensure that annotation method does not clash with members of Object/Annotation
956 chk.validateAnnotationMethod(tree.pos(), m);
958 if (tree.defaultValue != null) {
959 // if default value is an annotation, check it is a well-formed
960 // annotation value (e.g. no duplicate values, no missing values, etc.)
961 chk.validateAnnotationTree(tree.defaultValue);
962 }
963 }
965 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
966 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
968 if (tree.body == null) {
969 // Empty bodies are only allowed for
970 // abstract, native, or interface methods, or for methods
971 // in a retrofit signature class.
972 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
973 !relax)
974 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
975 if (tree.defaultValue != null) {
976 if ((owner.flags() & ANNOTATION) == 0)
977 log.error(tree.pos(),
978 "default.allowed.in.intf.annotation.member");
979 }
980 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
981 if ((owner.flags() & INTERFACE) != 0) {
982 log.error(tree.body.pos(), "intf.meth.cant.have.body");
983 } else {
984 log.error(tree.pos(), "abstract.meth.cant.have.body");
985 }
986 } else if ((tree.mods.flags & NATIVE) != 0) {
987 log.error(tree.pos(), "native.meth.cant.have.body");
988 } else {
989 // Add an implicit super() call unless an explicit call to
990 // super(...) or this(...) is given
991 // or we are compiling class java.lang.Object.
992 if (tree.name == names.init && owner.type != syms.objectType) {
993 JCBlock body = tree.body;
994 if (body.stats.isEmpty() ||
995 !TreeInfo.isSelfCall(body.stats.head)) {
996 body.stats = body.stats.
997 prepend(memberEnter.SuperCall(make.at(body.pos),
998 List.<Type>nil(),
999 List.<JCVariableDecl>nil(),
1000 false));
1001 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1002 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1003 TreeInfo.isSuperCall(body.stats.head)) {
1004 // enum constructors are not allowed to call super
1005 // directly, so make sure there aren't any super calls
1006 // in enum constructors, except in the compiler
1007 // generated one.
1008 log.error(tree.body.stats.head.pos(),
1009 "call.to.super.not.allowed.in.enum.ctor",
1010 env.enclClass.sym);
1011 }
1012 }
1014 // Attribute all type annotations in the body
1015 memberEnter.typeAnnotate(tree.body, localEnv, m);
1016 annotate.flush();
1018 // Attribute method body.
1019 attribStat(tree.body, localEnv);
1020 }
1022 localEnv.info.scope.leave();
1023 result = tree.type = m.type;
1024 chk.validateAnnotations(tree.mods.annotations, m);
1025 }
1026 finally {
1027 chk.setLint(prevLint);
1028 chk.setMethod(prevMethod);
1029 }
1030 }
1032 public void visitVarDef(JCVariableDecl tree) {
1033 // Local variables have not been entered yet, so we need to do it now:
1034 if (env.info.scope.owner.kind == MTH) {
1035 if (tree.sym != null) {
1036 // parameters have already been entered
1037 env.info.scope.enter(tree.sym);
1038 } else {
1039 memberEnter.memberEnter(tree, env);
1040 annotate.flush();
1041 }
1042 } else {
1043 if (tree.init != null) {
1044 // Field initializer expression need to be entered.
1045 memberEnter.typeAnnotate(tree.init, env, tree.sym);
1046 annotate.flush();
1047 }
1048 }
1050 VarSymbol v = tree.sym;
1051 Lint lint = env.info.lint.augment(v);
1052 Lint prevLint = chk.setLint(lint);
1054 // Check that the variable's declared type is well-formed.
1055 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1056 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1057 (tree.sym.flags() & PARAMETER) != 0;
1058 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1059 deferredLintHandler.flush(tree.pos());
1061 try {
1062 chk.checkDeprecatedAnnotation(tree.pos(), v);
1064 if (tree.init != null) {
1065 if ((v.flags_field & FINAL) != 0 &&
1066 memberEnter.needsLazyConstValue(tree.init)) {
1067 // In this case, `v' is final. Ensure that it's initializer is
1068 // evaluated.
1069 v.getConstValue(); // ensure initializer is evaluated
1070 } else {
1071 // Attribute initializer in a new environment
1072 // with the declared variable as owner.
1073 // Check that initializer conforms to variable's declared type.
1074 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1075 initEnv.info.lint = lint;
1076 // In order to catch self-references, we set the variable's
1077 // declaration position to maximal possible value, effectively
1078 // marking the variable as undefined.
1079 initEnv.info.enclVar = v;
1080 attribExpr(tree.init, initEnv, v.type);
1081 }
1082 }
1083 result = tree.type = v.type;
1084 chk.validateAnnotations(tree.mods.annotations, v);
1085 }
1086 finally {
1087 chk.setLint(prevLint);
1088 }
1089 }
1091 public void visitSkip(JCSkip tree) {
1092 result = null;
1093 }
1095 public void visitBlock(JCBlock tree) {
1096 if (env.info.scope.owner.kind == TYP) {
1097 // Block is a static or instance initializer;
1098 // let the owner of the environment be a freshly
1099 // created BLOCK-method.
1100 Env<AttrContext> localEnv =
1101 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1102 localEnv.info.scope.owner =
1103 new MethodSymbol(tree.flags | BLOCK |
1104 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1105 env.info.scope.owner);
1106 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1108 // Attribute all type annotations in the block
1109 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1110 annotate.flush();
1112 {
1113 // Store init and clinit type annotations with the ClassSymbol
1114 // to allow output in Gen.normalizeDefs.
1115 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1116 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1117 if ((tree.flags & STATIC) != 0) {
1118 cs.appendClassInitTypeAttributes(tas);
1119 } else {
1120 cs.appendInitTypeAttributes(tas);
1121 }
1122 }
1124 attribStats(tree.stats, localEnv);
1125 } else {
1126 // Create a new local environment with a local scope.
1127 Env<AttrContext> localEnv =
1128 env.dup(tree, env.info.dup(env.info.scope.dup()));
1129 try {
1130 attribStats(tree.stats, localEnv);
1131 } finally {
1132 localEnv.info.scope.leave();
1133 }
1134 }
1135 result = null;
1136 }
1138 public void visitDoLoop(JCDoWhileLoop tree) {
1139 attribStat(tree.body, env.dup(tree));
1140 attribExpr(tree.cond, env, syms.booleanType);
1141 result = null;
1142 }
1144 public void visitWhileLoop(JCWhileLoop tree) {
1145 attribExpr(tree.cond, env, syms.booleanType);
1146 attribStat(tree.body, env.dup(tree));
1147 result = null;
1148 }
1150 public void visitForLoop(JCForLoop tree) {
1151 Env<AttrContext> loopEnv =
1152 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1153 try {
1154 attribStats(tree.init, loopEnv);
1155 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1156 loopEnv.tree = tree; // before, we were not in loop!
1157 attribStats(tree.step, loopEnv);
1158 attribStat(tree.body, loopEnv);
1159 result = null;
1160 }
1161 finally {
1162 loopEnv.info.scope.leave();
1163 }
1164 }
1166 public void visitForeachLoop(JCEnhancedForLoop tree) {
1167 Env<AttrContext> loopEnv =
1168 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1169 try {
1170 //the Formal Parameter of a for-each loop is not in the scope when
1171 //attributing the for-each expression; we mimick this by attributing
1172 //the for-each expression first (against original scope).
1173 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1174 attribStat(tree.var, loopEnv);
1175 chk.checkNonVoid(tree.pos(), exprType);
1176 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1177 if (elemtype == null) {
1178 // or perhaps expr implements Iterable<T>?
1179 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1180 if (base == null) {
1181 log.error(tree.expr.pos(),
1182 "foreach.not.applicable.to.type",
1183 exprType,
1184 diags.fragment("type.req.array.or.iterable"));
1185 elemtype = types.createErrorType(exprType);
1186 } else {
1187 List<Type> iterableParams = base.allparams();
1188 elemtype = iterableParams.isEmpty()
1189 ? syms.objectType
1190 : types.upperBound(iterableParams.head);
1191 }
1192 }
1193 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1194 loopEnv.tree = tree; // before, we were not in loop!
1195 attribStat(tree.body, loopEnv);
1196 result = null;
1197 }
1198 finally {
1199 loopEnv.info.scope.leave();
1200 }
1201 }
1203 public void visitLabelled(JCLabeledStatement tree) {
1204 // Check that label is not used in an enclosing statement
1205 Env<AttrContext> env1 = env;
1206 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1207 if (env1.tree.hasTag(LABELLED) &&
1208 ((JCLabeledStatement) env1.tree).label == tree.label) {
1209 log.error(tree.pos(), "label.already.in.use",
1210 tree.label);
1211 break;
1212 }
1213 env1 = env1.next;
1214 }
1216 attribStat(tree.body, env.dup(tree));
1217 result = null;
1218 }
1220 public void visitSwitch(JCSwitch tree) {
1221 Type seltype = attribExpr(tree.selector, env);
1223 Env<AttrContext> switchEnv =
1224 env.dup(tree, env.info.dup(env.info.scope.dup()));
1226 try {
1228 boolean enumSwitch =
1229 allowEnums &&
1230 (seltype.tsym.flags() & Flags.ENUM) != 0;
1231 boolean stringSwitch = false;
1232 if (types.isSameType(seltype, syms.stringType)) {
1233 if (allowStringsInSwitch) {
1234 stringSwitch = true;
1235 } else {
1236 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1237 }
1238 }
1239 if (!enumSwitch && !stringSwitch)
1240 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1242 // Attribute all cases and
1243 // check that there are no duplicate case labels or default clauses.
1244 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1245 boolean hasDefault = false; // Is there a default label?
1246 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1247 JCCase c = l.head;
1248 Env<AttrContext> caseEnv =
1249 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1250 try {
1251 if (c.pat != null) {
1252 if (enumSwitch) {
1253 Symbol sym = enumConstant(c.pat, seltype);
1254 if (sym == null) {
1255 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1256 } else if (!labels.add(sym)) {
1257 log.error(c.pos(), "duplicate.case.label");
1258 }
1259 } else {
1260 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1261 if (!pattype.hasTag(ERROR)) {
1262 if (pattype.constValue() == null) {
1263 log.error(c.pat.pos(),
1264 (stringSwitch ? "string.const.req" : "const.expr.req"));
1265 } else if (labels.contains(pattype.constValue())) {
1266 log.error(c.pos(), "duplicate.case.label");
1267 } else {
1268 labels.add(pattype.constValue());
1269 }
1270 }
1271 }
1272 } else if (hasDefault) {
1273 log.error(c.pos(), "duplicate.default.label");
1274 } else {
1275 hasDefault = true;
1276 }
1277 attribStats(c.stats, caseEnv);
1278 } finally {
1279 caseEnv.info.scope.leave();
1280 addVars(c.stats, switchEnv.info.scope);
1281 }
1282 }
1284 result = null;
1285 }
1286 finally {
1287 switchEnv.info.scope.leave();
1288 }
1289 }
1290 // where
1291 /** Add any variables defined in stats to the switch scope. */
1292 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1293 for (;stats.nonEmpty(); stats = stats.tail) {
1294 JCTree stat = stats.head;
1295 if (stat.hasTag(VARDEF))
1296 switchScope.enter(((JCVariableDecl) stat).sym);
1297 }
1298 }
1299 // where
1300 /** Return the selected enumeration constant symbol, or null. */
1301 private Symbol enumConstant(JCTree tree, Type enumType) {
1302 if (!tree.hasTag(IDENT)) {
1303 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1304 return syms.errSymbol;
1305 }
1306 JCIdent ident = (JCIdent)tree;
1307 Name name = ident.name;
1308 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1309 e.scope != null; e = e.next()) {
1310 if (e.sym.kind == VAR) {
1311 Symbol s = ident.sym = e.sym;
1312 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1313 ident.type = s.type;
1314 return ((s.flags_field & Flags.ENUM) == 0)
1315 ? null : s;
1316 }
1317 }
1318 return null;
1319 }
1321 public void visitSynchronized(JCSynchronized tree) {
1322 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1323 attribStat(tree.body, env);
1324 result = null;
1325 }
1327 public void visitTry(JCTry tree) {
1328 // Create a new local environment with a local
1329 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1330 try {
1331 boolean isTryWithResource = tree.resources.nonEmpty();
1332 // Create a nested environment for attributing the try block if needed
1333 Env<AttrContext> tryEnv = isTryWithResource ?
1334 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1335 localEnv;
1336 try {
1337 // Attribute resource declarations
1338 for (JCTree resource : tree.resources) {
1339 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1340 @Override
1341 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1342 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1343 }
1344 };
1345 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1346 if (resource.hasTag(VARDEF)) {
1347 attribStat(resource, tryEnv);
1348 twrResult.check(resource, resource.type);
1350 //check that resource type cannot throw InterruptedException
1351 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1353 VarSymbol var = ((JCVariableDecl) resource).sym;
1354 var.setData(ElementKind.RESOURCE_VARIABLE);
1355 } else {
1356 attribTree(resource, tryEnv, twrResult);
1357 }
1358 }
1359 // Attribute body
1360 attribStat(tree.body, tryEnv);
1361 } finally {
1362 if (isTryWithResource)
1363 tryEnv.info.scope.leave();
1364 }
1366 // Attribute catch clauses
1367 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1368 JCCatch c = l.head;
1369 Env<AttrContext> catchEnv =
1370 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1371 try {
1372 Type ctype = attribStat(c.param, catchEnv);
1373 if (TreeInfo.isMultiCatch(c)) {
1374 //multi-catch parameter is implicitly marked as final
1375 c.param.sym.flags_field |= FINAL | UNION;
1376 }
1377 if (c.param.sym.kind == Kinds.VAR) {
1378 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1379 }
1380 chk.checkType(c.param.vartype.pos(),
1381 chk.checkClassType(c.param.vartype.pos(), ctype),
1382 syms.throwableType);
1383 attribStat(c.body, catchEnv);
1384 } finally {
1385 catchEnv.info.scope.leave();
1386 }
1387 }
1389 // Attribute finalizer
1390 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1391 result = null;
1392 }
1393 finally {
1394 localEnv.info.scope.leave();
1395 }
1396 }
1398 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1399 if (!resource.isErroneous() &&
1400 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1401 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1402 Symbol close = syms.noSymbol;
1403 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1404 try {
1405 close = rs.resolveQualifiedMethod(pos,
1406 env,
1407 resource,
1408 names.close,
1409 List.<Type>nil(),
1410 List.<Type>nil());
1411 }
1412 finally {
1413 log.popDiagnosticHandler(discardHandler);
1414 }
1415 if (close.kind == MTH &&
1416 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1417 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1418 env.info.lint.isEnabled(LintCategory.TRY)) {
1419 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1420 }
1421 }
1422 }
1424 public void visitConditional(JCConditional tree) {
1425 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1427 tree.polyKind = (!allowPoly ||
1428 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1429 isBooleanOrNumeric(env, tree)) ?
1430 PolyKind.STANDALONE : PolyKind.POLY;
1432 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1433 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1434 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1435 result = tree.type = types.createErrorType(resultInfo.pt);
1436 return;
1437 }
1439 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1440 unknownExprInfo :
1441 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1442 //this will use enclosing check context to check compatibility of
1443 //subexpression against target type; if we are in a method check context,
1444 //depending on whether boxing is allowed, we could have incompatibilities
1445 @Override
1446 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1447 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1448 }
1449 });
1451 Type truetype = attribTree(tree.truepart, env, condInfo);
1452 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1454 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1455 if (condtype.constValue() != null &&
1456 truetype.constValue() != null &&
1457 falsetype.constValue() != null &&
1458 !owntype.hasTag(NONE)) {
1459 //constant folding
1460 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1461 }
1462 result = check(tree, owntype, VAL, resultInfo);
1463 }
1464 //where
1465 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1466 switch (tree.getTag()) {
1467 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1468 ((JCLiteral)tree).typetag == BOOLEAN ||
1469 ((JCLiteral)tree).typetag == BOT;
1470 case LAMBDA: case REFERENCE: return false;
1471 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1472 case CONDEXPR:
1473 JCConditional condTree = (JCConditional)tree;
1474 return isBooleanOrNumeric(env, condTree.truepart) &&
1475 isBooleanOrNumeric(env, condTree.falsepart);
1476 case APPLY:
1477 JCMethodInvocation speculativeMethodTree =
1478 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1479 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1480 return types.unboxedTypeOrType(owntype).isPrimitive();
1481 case NEWCLASS:
1482 JCExpression className =
1483 removeClassParams.translate(((JCNewClass)tree).clazz);
1484 JCExpression speculativeNewClassTree =
1485 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1486 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1487 default:
1488 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1489 speculativeType = types.unboxedTypeOrType(speculativeType);
1490 return speculativeType.isPrimitive();
1491 }
1492 }
1493 //where
1494 TreeTranslator removeClassParams = new TreeTranslator() {
1495 @Override
1496 public void visitTypeApply(JCTypeApply tree) {
1497 result = translate(tree.clazz);
1498 }
1499 };
1501 /** Compute the type of a conditional expression, after
1502 * checking that it exists. See JLS 15.25. Does not take into
1503 * account the special case where condition and both arms
1504 * are constants.
1505 *
1506 * @param pos The source position to be used for error
1507 * diagnostics.
1508 * @param thentype The type of the expression's then-part.
1509 * @param elsetype The type of the expression's else-part.
1510 */
1511 private Type condType(DiagnosticPosition pos,
1512 Type thentype, Type elsetype) {
1513 // If same type, that is the result
1514 if (types.isSameType(thentype, elsetype))
1515 return thentype.baseType();
1517 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1518 ? thentype : types.unboxedType(thentype);
1519 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1520 ? elsetype : types.unboxedType(elsetype);
1522 // Otherwise, if both arms can be converted to a numeric
1523 // type, return the least numeric type that fits both arms
1524 // (i.e. return larger of the two, or return int if one
1525 // arm is short, the other is char).
1526 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1527 // If one arm has an integer subrange type (i.e., byte,
1528 // short, or char), and the other is an integer constant
1529 // that fits into the subrange, return the subrange type.
1530 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1531 elseUnboxed.hasTag(INT) &&
1532 types.isAssignable(elseUnboxed, thenUnboxed)) {
1533 return thenUnboxed.baseType();
1534 }
1535 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1536 thenUnboxed.hasTag(INT) &&
1537 types.isAssignable(thenUnboxed, elseUnboxed)) {
1538 return elseUnboxed.baseType();
1539 }
1541 for (TypeTag tag : primitiveTags) {
1542 Type candidate = syms.typeOfTag[tag.ordinal()];
1543 if (types.isSubtype(thenUnboxed, candidate) &&
1544 types.isSubtype(elseUnboxed, candidate)) {
1545 return candidate;
1546 }
1547 }
1548 }
1550 // Those were all the cases that could result in a primitive
1551 if (allowBoxing) {
1552 if (thentype.isPrimitive())
1553 thentype = types.boxedClass(thentype).type;
1554 if (elsetype.isPrimitive())
1555 elsetype = types.boxedClass(elsetype).type;
1556 }
1558 if (types.isSubtype(thentype, elsetype))
1559 return elsetype.baseType();
1560 if (types.isSubtype(elsetype, thentype))
1561 return thentype.baseType();
1563 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1564 log.error(pos, "neither.conditional.subtype",
1565 thentype, elsetype);
1566 return thentype.baseType();
1567 }
1569 // both are known to be reference types. The result is
1570 // lub(thentype,elsetype). This cannot fail, as it will
1571 // always be possible to infer "Object" if nothing better.
1572 return types.lub(thentype.baseType(), elsetype.baseType());
1573 }
1575 final static TypeTag[] primitiveTags = new TypeTag[]{
1576 BYTE,
1577 CHAR,
1578 SHORT,
1579 INT,
1580 LONG,
1581 FLOAT,
1582 DOUBLE,
1583 BOOLEAN,
1584 };
1586 public void visitIf(JCIf tree) {
1587 attribExpr(tree.cond, env, syms.booleanType);
1588 attribStat(tree.thenpart, env);
1589 if (tree.elsepart != null)
1590 attribStat(tree.elsepart, env);
1591 chk.checkEmptyIf(tree);
1592 result = null;
1593 }
1595 public void visitExec(JCExpressionStatement tree) {
1596 //a fresh environment is required for 292 inference to work properly ---
1597 //see Infer.instantiatePolymorphicSignatureInstance()
1598 Env<AttrContext> localEnv = env.dup(tree);
1599 attribExpr(tree.expr, localEnv);
1600 result = null;
1601 }
1603 public void visitBreak(JCBreak tree) {
1604 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1605 result = null;
1606 }
1608 public void visitContinue(JCContinue tree) {
1609 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1610 result = null;
1611 }
1612 //where
1613 /** Return the target of a break or continue statement, if it exists,
1614 * report an error if not.
1615 * Note: The target of a labelled break or continue is the
1616 * (non-labelled) statement tree referred to by the label,
1617 * not the tree representing the labelled statement itself.
1618 *
1619 * @param pos The position to be used for error diagnostics
1620 * @param tag The tag of the jump statement. This is either
1621 * Tree.BREAK or Tree.CONTINUE.
1622 * @param label The label of the jump statement, or null if no
1623 * label is given.
1624 * @param env The environment current at the jump statement.
1625 */
1626 private JCTree findJumpTarget(DiagnosticPosition pos,
1627 JCTree.Tag tag,
1628 Name label,
1629 Env<AttrContext> env) {
1630 // Search environments outwards from the point of jump.
1631 Env<AttrContext> env1 = env;
1632 LOOP:
1633 while (env1 != null) {
1634 switch (env1.tree.getTag()) {
1635 case LABELLED:
1636 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1637 if (label == labelled.label) {
1638 // If jump is a continue, check that target is a loop.
1639 if (tag == CONTINUE) {
1640 if (!labelled.body.hasTag(DOLOOP) &&
1641 !labelled.body.hasTag(WHILELOOP) &&
1642 !labelled.body.hasTag(FORLOOP) &&
1643 !labelled.body.hasTag(FOREACHLOOP))
1644 log.error(pos, "not.loop.label", label);
1645 // Found labelled statement target, now go inwards
1646 // to next non-labelled tree.
1647 return TreeInfo.referencedStatement(labelled);
1648 } else {
1649 return labelled;
1650 }
1651 }
1652 break;
1653 case DOLOOP:
1654 case WHILELOOP:
1655 case FORLOOP:
1656 case FOREACHLOOP:
1657 if (label == null) return env1.tree;
1658 break;
1659 case SWITCH:
1660 if (label == null && tag == BREAK) return env1.tree;
1661 break;
1662 case LAMBDA:
1663 case METHODDEF:
1664 case CLASSDEF:
1665 break LOOP;
1666 default:
1667 }
1668 env1 = env1.next;
1669 }
1670 if (label != null)
1671 log.error(pos, "undef.label", label);
1672 else if (tag == CONTINUE)
1673 log.error(pos, "cont.outside.loop");
1674 else
1675 log.error(pos, "break.outside.switch.loop");
1676 return null;
1677 }
1679 public void visitReturn(JCReturn tree) {
1680 // Check that there is an enclosing method which is
1681 // nested within than the enclosing class.
1682 if (env.info.returnResult == null) {
1683 log.error(tree.pos(), "ret.outside.meth");
1684 } else {
1685 // Attribute return expression, if it exists, and check that
1686 // it conforms to result type of enclosing method.
1687 if (tree.expr != null) {
1688 if (env.info.returnResult.pt.hasTag(VOID)) {
1689 env.info.returnResult.checkContext.report(tree.expr.pos(),
1690 diags.fragment("unexpected.ret.val"));
1691 }
1692 attribTree(tree.expr, env, env.info.returnResult);
1693 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1694 !env.info.returnResult.pt.hasTag(NONE)) {
1695 env.info.returnResult.checkContext.report(tree.pos(),
1696 diags.fragment("missing.ret.val"));
1697 }
1698 }
1699 result = null;
1700 }
1702 public void visitThrow(JCThrow tree) {
1703 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1704 if (allowPoly) {
1705 chk.checkType(tree, owntype, syms.throwableType);
1706 }
1707 result = null;
1708 }
1710 public void visitAssert(JCAssert tree) {
1711 attribExpr(tree.cond, env, syms.booleanType);
1712 if (tree.detail != null) {
1713 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1714 }
1715 result = null;
1716 }
1718 /** Visitor method for method invocations.
1719 * NOTE: The method part of an application will have in its type field
1720 * the return type of the method, not the method's type itself!
1721 */
1722 public void visitApply(JCMethodInvocation tree) {
1723 // The local environment of a method application is
1724 // a new environment nested in the current one.
1725 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1727 // The types of the actual method arguments.
1728 List<Type> argtypes;
1730 // The types of the actual method type arguments.
1731 List<Type> typeargtypes = null;
1733 Name methName = TreeInfo.name(tree.meth);
1735 boolean isConstructorCall =
1736 methName == names._this || methName == names._super;
1738 ListBuffer<Type> argtypesBuf = ListBuffer.lb();
1739 if (isConstructorCall) {
1740 // We are seeing a ...this(...) or ...super(...) call.
1741 // Check that this is the first statement in a constructor.
1742 if (checkFirstConstructorStat(tree, env)) {
1744 // Record the fact
1745 // that this is a constructor call (using isSelfCall).
1746 localEnv.info.isSelfCall = true;
1748 // Attribute arguments, yielding list of argument types.
1749 attribArgs(tree.args, localEnv, argtypesBuf);
1750 argtypes = argtypesBuf.toList();
1751 typeargtypes = attribTypes(tree.typeargs, localEnv);
1753 // Variable `site' points to the class in which the called
1754 // constructor is defined.
1755 Type site = env.enclClass.sym.type;
1756 if (methName == names._super) {
1757 if (site == syms.objectType) {
1758 log.error(tree.meth.pos(), "no.superclass", site);
1759 site = types.createErrorType(syms.objectType);
1760 } else {
1761 site = types.supertype(site);
1762 }
1763 }
1765 if (site.hasTag(CLASS)) {
1766 Type encl = site.getEnclosingType();
1767 while (encl != null && encl.hasTag(TYPEVAR))
1768 encl = encl.getUpperBound();
1769 if (encl.hasTag(CLASS)) {
1770 // we are calling a nested class
1772 if (tree.meth.hasTag(SELECT)) {
1773 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1775 // We are seeing a prefixed call, of the form
1776 // <expr>.super(...).
1777 // Check that the prefix expression conforms
1778 // to the outer instance type of the class.
1779 chk.checkRefType(qualifier.pos(),
1780 attribExpr(qualifier, localEnv,
1781 encl));
1782 } else if (methName == names._super) {
1783 // qualifier omitted; check for existence
1784 // of an appropriate implicit qualifier.
1785 rs.resolveImplicitThis(tree.meth.pos(),
1786 localEnv, site, true);
1787 }
1788 } else if (tree.meth.hasTag(SELECT)) {
1789 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1790 site.tsym);
1791 }
1793 // if we're calling a java.lang.Enum constructor,
1794 // prefix the implicit String and int parameters
1795 if (site.tsym == syms.enumSym && allowEnums)
1796 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1798 // Resolve the called constructor under the assumption
1799 // that we are referring to a superclass instance of the
1800 // current instance (JLS ???).
1801 boolean selectSuperPrev = localEnv.info.selectSuper;
1802 localEnv.info.selectSuper = true;
1803 localEnv.info.pendingResolutionPhase = null;
1804 Symbol sym = rs.resolveConstructor(
1805 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1806 localEnv.info.selectSuper = selectSuperPrev;
1808 // Set method symbol to resolved constructor...
1809 TreeInfo.setSymbol(tree.meth, sym);
1811 // ...and check that it is legal in the current context.
1812 // (this will also set the tree's type)
1813 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1814 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1815 }
1816 // Otherwise, `site' is an error type and we do nothing
1817 }
1818 result = tree.type = syms.voidType;
1819 } else {
1820 // Otherwise, we are seeing a regular method call.
1821 // Attribute the arguments, yielding list of argument types, ...
1822 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1823 argtypes = argtypesBuf.toList();
1824 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1826 // ... and attribute the method using as a prototype a methodtype
1827 // whose formal argument types is exactly the list of actual
1828 // arguments (this will also set the method symbol).
1829 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1830 localEnv.info.pendingResolutionPhase = null;
1831 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1833 // Compute the result type.
1834 Type restype = mtype.getReturnType();
1835 if (restype.hasTag(WILDCARD))
1836 throw new AssertionError(mtype);
1838 Type qualifier = (tree.meth.hasTag(SELECT))
1839 ? ((JCFieldAccess) tree.meth).selected.type
1840 : env.enclClass.sym.type;
1841 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1843 chk.checkRefTypes(tree.typeargs, typeargtypes);
1845 // Check that value of resulting type is admissible in the
1846 // current context. Also, capture the return type
1847 result = check(tree, capture(restype), VAL, resultInfo);
1848 }
1849 chk.validate(tree.typeargs, localEnv);
1850 }
1851 //where
1852 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1853 if (allowCovariantReturns &&
1854 methodName == names.clone &&
1855 types.isArray(qualifierType)) {
1856 // as a special case, array.clone() has a result that is
1857 // the same as static type of the array being cloned
1858 return qualifierType;
1859 } else if (allowGenerics &&
1860 methodName == names.getClass &&
1861 argtypes.isEmpty()) {
1862 // as a special case, x.getClass() has type Class<? extends |X|>
1863 return new ClassType(restype.getEnclosingType(),
1864 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1865 BoundKind.EXTENDS,
1866 syms.boundClass)),
1867 restype.tsym);
1868 } else {
1869 return restype;
1870 }
1871 }
1873 /** Check that given application node appears as first statement
1874 * in a constructor call.
1875 * @param tree The application node
1876 * @param env The environment current at the application.
1877 */
1878 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1879 JCMethodDecl enclMethod = env.enclMethod;
1880 if (enclMethod != null && enclMethod.name == names.init) {
1881 JCBlock body = enclMethod.body;
1882 if (body.stats.head.hasTag(EXEC) &&
1883 ((JCExpressionStatement) body.stats.head).expr == tree)
1884 return true;
1885 }
1886 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1887 TreeInfo.name(tree.meth));
1888 return false;
1889 }
1891 /** Obtain a method type with given argument types.
1892 */
1893 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1894 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1895 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1896 }
1898 public void visitNewClass(final JCNewClass tree) {
1899 Type owntype = types.createErrorType(tree.type);
1901 // The local environment of a class creation is
1902 // a new environment nested in the current one.
1903 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1905 // The anonymous inner class definition of the new expression,
1906 // if one is defined by it.
1907 JCClassDecl cdef = tree.def;
1909 // If enclosing class is given, attribute it, and
1910 // complete class name to be fully qualified
1911 JCExpression clazz = tree.clazz; // Class field following new
1912 JCExpression clazzid; // Identifier in class field
1913 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1914 annoclazzid = null;
1916 if (clazz.hasTag(TYPEAPPLY)) {
1917 clazzid = ((JCTypeApply) clazz).clazz;
1918 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1919 annoclazzid = (JCAnnotatedType) clazzid;
1920 clazzid = annoclazzid.underlyingType;
1921 }
1922 } else {
1923 if (clazz.hasTag(ANNOTATED_TYPE)) {
1924 annoclazzid = (JCAnnotatedType) clazz;
1925 clazzid = annoclazzid.underlyingType;
1926 } else {
1927 clazzid = clazz;
1928 }
1929 }
1931 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1933 if (tree.encl != null) {
1934 // We are seeing a qualified new, of the form
1935 // <expr>.new C <...> (...) ...
1936 // In this case, we let clazz stand for the name of the
1937 // allocated class C prefixed with the type of the qualifier
1938 // expression, so that we can
1939 // resolve it with standard techniques later. I.e., if
1940 // <expr> has type T, then <expr>.new C <...> (...)
1941 // yields a clazz T.C.
1942 Type encltype = chk.checkRefType(tree.encl.pos(),
1943 attribExpr(tree.encl, env));
1944 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1945 // from expr to the combined type, or not? Yes, do this.
1946 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1947 ((JCIdent) clazzid).name);
1949 EndPosTable endPosTable = this.env.toplevel.endPositions;
1950 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1951 if (clazz.hasTag(ANNOTATED_TYPE)) {
1952 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1953 List<JCAnnotation> annos = annoType.annotations;
1955 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1956 clazzid1 = make.at(tree.pos).
1957 TypeApply(clazzid1,
1958 ((JCTypeApply) clazz).arguments);
1959 }
1961 clazzid1 = make.at(tree.pos).
1962 AnnotatedType(annos, clazzid1);
1963 } else if (clazz.hasTag(TYPEAPPLY)) {
1964 clazzid1 = make.at(tree.pos).
1965 TypeApply(clazzid1,
1966 ((JCTypeApply) clazz).arguments);
1967 }
1969 clazz = clazzid1;
1970 }
1972 // Attribute clazz expression and store
1973 // symbol + type back into the attributed tree.
1974 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1975 attribIdentAsEnumType(env, (JCIdent)clazz) :
1976 attribType(clazz, env);
1978 clazztype = chk.checkDiamond(tree, clazztype);
1979 chk.validate(clazz, localEnv);
1980 if (tree.encl != null) {
1981 // We have to work in this case to store
1982 // symbol + type back into the attributed tree.
1983 tree.clazz.type = clazztype;
1984 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1985 clazzid.type = ((JCIdent) clazzid).sym.type;
1986 if (annoclazzid != null) {
1987 annoclazzid.type = clazzid.type;
1988 }
1989 if (!clazztype.isErroneous()) {
1990 if (cdef != null && clazztype.tsym.isInterface()) {
1991 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1992 } else if (clazztype.tsym.isStatic()) {
1993 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1994 }
1995 }
1996 } else if (!clazztype.tsym.isInterface() &&
1997 clazztype.getEnclosingType().hasTag(CLASS)) {
1998 // Check for the existence of an apropos outer instance
1999 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2000 }
2002 // Attribute constructor arguments.
2003 ListBuffer<Type> argtypesBuf = ListBuffer.lb();
2004 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
2005 List<Type> argtypes = argtypesBuf.toList();
2006 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2008 // If we have made no mistakes in the class type...
2009 if (clazztype.hasTag(CLASS)) {
2010 // Enums may not be instantiated except implicitly
2011 if (allowEnums &&
2012 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2013 (!env.tree.hasTag(VARDEF) ||
2014 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2015 ((JCVariableDecl) env.tree).init != tree))
2016 log.error(tree.pos(), "enum.cant.be.instantiated");
2017 // Check that class is not abstract
2018 if (cdef == null &&
2019 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2020 log.error(tree.pos(), "abstract.cant.be.instantiated",
2021 clazztype.tsym);
2022 } else if (cdef != null && clazztype.tsym.isInterface()) {
2023 // Check that no constructor arguments are given to
2024 // anonymous classes implementing an interface
2025 if (!argtypes.isEmpty())
2026 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2028 if (!typeargtypes.isEmpty())
2029 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2031 // Error recovery: pretend no arguments were supplied.
2032 argtypes = List.nil();
2033 typeargtypes = List.nil();
2034 } else if (TreeInfo.isDiamond(tree)) {
2035 ClassType site = new ClassType(clazztype.getEnclosingType(),
2036 clazztype.tsym.type.getTypeArguments(),
2037 clazztype.tsym);
2039 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2040 diamondEnv.info.selectSuper = cdef != null;
2041 diamondEnv.info.pendingResolutionPhase = null;
2043 //if the type of the instance creation expression is a class type
2044 //apply method resolution inference (JLS 15.12.2.7). The return type
2045 //of the resolved constructor will be a partially instantiated type
2046 Symbol constructor = rs.resolveDiamond(tree.pos(),
2047 diamondEnv,
2048 site,
2049 argtypes,
2050 typeargtypes);
2051 tree.constructor = constructor.baseSymbol();
2053 final TypeSymbol csym = clazztype.tsym;
2054 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2055 @Override
2056 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2057 enclosingContext.report(tree.clazz,
2058 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2059 }
2060 });
2061 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2062 constructorType = checkId(tree, site,
2063 constructor,
2064 diamondEnv,
2065 diamondResult);
2067 tree.clazz.type = types.createErrorType(clazztype);
2068 if (!constructorType.isErroneous()) {
2069 tree.clazz.type = clazztype = constructorType.getReturnType();
2070 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2071 }
2072 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2073 }
2075 // Resolve the called constructor under the assumption
2076 // that we are referring to a superclass instance of the
2077 // current instance (JLS ???).
2078 else {
2079 //the following code alters some of the fields in the current
2080 //AttrContext - hence, the current context must be dup'ed in
2081 //order to avoid downstream failures
2082 Env<AttrContext> rsEnv = localEnv.dup(tree);
2083 rsEnv.info.selectSuper = cdef != null;
2084 rsEnv.info.pendingResolutionPhase = null;
2085 tree.constructor = rs.resolveConstructor(
2086 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2087 if (cdef == null) { //do not check twice!
2088 tree.constructorType = checkId(tree,
2089 clazztype,
2090 tree.constructor,
2091 rsEnv,
2092 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2093 if (rsEnv.info.lastResolveVarargs())
2094 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2095 }
2096 if (cdef == null &&
2097 !clazztype.isErroneous() &&
2098 clazztype.getTypeArguments().nonEmpty() &&
2099 findDiamonds) {
2100 findDiamond(localEnv, tree, clazztype);
2101 }
2102 }
2104 if (cdef != null) {
2105 // We are seeing an anonymous class instance creation.
2106 // In this case, the class instance creation
2107 // expression
2108 //
2109 // E.new <typeargs1>C<typargs2>(args) { ... }
2110 //
2111 // is represented internally as
2112 //
2113 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2114 //
2115 // This expression is then *transformed* as follows:
2116 //
2117 // (1) add a STATIC flag to the class definition
2118 // if the current environment is static
2119 // (2) add an extends or implements clause
2120 // (3) add a constructor.
2121 //
2122 // For instance, if C is a class, and ET is the type of E,
2123 // the expression
2124 //
2125 // E.new <typeargs1>C<typargs2>(args) { ... }
2126 //
2127 // is translated to (where X is a fresh name and typarams is the
2128 // parameter list of the super constructor):
2129 //
2130 // new <typeargs1>X(<*nullchk*>E, args) where
2131 // X extends C<typargs2> {
2132 // <typarams> X(ET e, args) {
2133 // e.<typeargs1>super(args)
2134 // }
2135 // ...
2136 // }
2137 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2139 if (clazztype.tsym.isInterface()) {
2140 cdef.implementing = List.of(clazz);
2141 } else {
2142 cdef.extending = clazz;
2143 }
2145 attribStat(cdef, localEnv);
2147 checkLambdaCandidate(tree, cdef.sym, clazztype);
2149 // If an outer instance is given,
2150 // prefix it to the constructor arguments
2151 // and delete it from the new expression
2152 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2153 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2154 argtypes = argtypes.prepend(tree.encl.type);
2155 tree.encl = null;
2156 }
2158 // Reassign clazztype and recompute constructor.
2159 clazztype = cdef.sym.type;
2160 Symbol sym = tree.constructor = rs.resolveConstructor(
2161 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2162 Assert.check(sym.kind < AMBIGUOUS);
2163 tree.constructor = sym;
2164 tree.constructorType = checkId(tree,
2165 clazztype,
2166 tree.constructor,
2167 localEnv,
2168 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2169 } else {
2170 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2171 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2172 tree.clazz.type.tsym);
2173 }
2174 }
2176 if (tree.constructor != null && tree.constructor.kind == MTH)
2177 owntype = clazztype;
2178 }
2179 result = check(tree, owntype, VAL, resultInfo);
2180 chk.validate(tree.typeargs, localEnv);
2181 }
2182 //where
2183 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2184 JCTypeApply ta = (JCTypeApply)tree.clazz;
2185 List<JCExpression> prevTypeargs = ta.arguments;
2186 try {
2187 //create a 'fake' diamond AST node by removing type-argument trees
2188 ta.arguments = List.nil();
2189 ResultInfo findDiamondResult = new ResultInfo(VAL,
2190 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2191 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2192 Type polyPt = allowPoly ?
2193 syms.objectType :
2194 clazztype;
2195 if (!inferred.isErroneous() &&
2196 (allowPoly && pt() == Infer.anyPoly ?
2197 types.isSameType(inferred, clazztype) :
2198 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2199 String key = types.isSameType(clazztype, inferred) ?
2200 "diamond.redundant.args" :
2201 "diamond.redundant.args.1";
2202 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2203 }
2204 } finally {
2205 ta.arguments = prevTypeargs;
2206 }
2207 }
2209 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2210 if (allowLambda &&
2211 identifyLambdaCandidate &&
2212 clazztype.hasTag(CLASS) &&
2213 !pt().hasTag(NONE) &&
2214 types.isFunctionalInterface(clazztype.tsym)) {
2215 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2216 int count = 0;
2217 boolean found = false;
2218 for (Symbol sym : csym.members().getElements()) {
2219 if ((sym.flags() & SYNTHETIC) != 0 ||
2220 sym.isConstructor()) continue;
2221 count++;
2222 if (sym.kind != MTH ||
2223 !sym.name.equals(descriptor.name)) continue;
2224 Type mtype = types.memberType(clazztype, sym);
2225 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2226 found = true;
2227 }
2228 }
2229 if (found && count == 1) {
2230 log.note(tree.def, "potential.lambda.found");
2231 }
2232 }
2233 }
2235 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2236 Symbol sym) {
2237 // Ensure that no declaration annotations are present.
2238 // Note that a tree type might be an AnnotatedType with
2239 // empty annotations, if only declaration annotations were given.
2240 // This method will raise an error for such a type.
2241 for (JCAnnotation ai : annotations) {
2242 if (TypeAnnotations.annotationType(syms, names, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2243 log.error(ai.pos(), "annotation.type.not.applicable");
2244 }
2245 }
2246 }
2249 /** Make an attributed null check tree.
2250 */
2251 public JCExpression makeNullCheck(JCExpression arg) {
2252 // optimization: X.this is never null; skip null check
2253 Name name = TreeInfo.name(arg);
2254 if (name == names._this || name == names._super) return arg;
2256 JCTree.Tag optag = NULLCHK;
2257 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2258 tree.operator = syms.nullcheck;
2259 tree.type = arg.type;
2260 return tree;
2261 }
2263 public void visitNewArray(JCNewArray tree) {
2264 Type owntype = types.createErrorType(tree.type);
2265 Env<AttrContext> localEnv = env.dup(tree);
2266 Type elemtype;
2267 if (tree.elemtype != null) {
2268 elemtype = attribType(tree.elemtype, localEnv);
2269 chk.validate(tree.elemtype, localEnv);
2270 owntype = elemtype;
2271 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2272 attribExpr(l.head, localEnv, syms.intType);
2273 owntype = new ArrayType(owntype, syms.arrayClass);
2274 }
2275 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2276 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2277 tree.elemtype.type.tsym);
2278 }
2279 } else {
2280 // we are seeing an untyped aggregate { ... }
2281 // this is allowed only if the prototype is an array
2282 if (pt().hasTag(ARRAY)) {
2283 elemtype = types.elemtype(pt());
2284 } else {
2285 if (!pt().hasTag(ERROR)) {
2286 log.error(tree.pos(), "illegal.initializer.for.type",
2287 pt());
2288 }
2289 elemtype = types.createErrorType(pt());
2290 }
2291 }
2292 if (tree.elems != null) {
2293 attribExprs(tree.elems, localEnv, elemtype);
2294 owntype = new ArrayType(elemtype, syms.arrayClass);
2295 }
2296 if (!types.isReifiable(elemtype))
2297 log.error(tree.pos(), "generic.array.creation");
2298 result = check(tree, owntype, VAL, resultInfo);
2299 }
2301 /*
2302 * A lambda expression can only be attributed when a target-type is available.
2303 * In addition, if the target-type is that of a functional interface whose
2304 * descriptor contains inference variables in argument position the lambda expression
2305 * is 'stuck' (see DeferredAttr).
2306 */
2307 @Override
2308 public void visitLambda(final JCLambda that) {
2309 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2310 if (pt().hasTag(NONE)) {
2311 //lambda only allowed in assignment or method invocation/cast context
2312 log.error(that.pos(), "unexpected.lambda");
2313 }
2314 result = that.type = types.createErrorType(pt());
2315 return;
2316 }
2317 //create an environment for attribution of the lambda expression
2318 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2319 boolean needsRecovery =
2320 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2321 try {
2322 Type currentTarget = pt();
2323 List<Type> explicitParamTypes = null;
2324 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2325 //attribute lambda parameters
2326 attribStats(that.params, localEnv);
2327 explicitParamTypes = TreeInfo.types(that.params);
2328 }
2330 Type lambdaType;
2331 if (pt() != Type.recoveryType) {
2332 /* We need to adjust the target. If the target is an
2333 * intersection type, for example: SAM & I1 & I2 ...
2334 * the target will be updated to SAM
2335 */
2336 currentTarget = targetChecker.visit(currentTarget, that);
2337 if (explicitParamTypes != null) {
2338 currentTarget = infer.instantiateFunctionalInterface(that,
2339 currentTarget, explicitParamTypes, resultInfo.checkContext);
2340 }
2341 lambdaType = types.findDescriptorType(currentTarget);
2342 } else {
2343 currentTarget = Type.recoveryType;
2344 lambdaType = fallbackDescriptorType(that);
2345 }
2347 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2349 if (lambdaType.hasTag(FORALL)) {
2350 //lambda expression target desc cannot be a generic method
2351 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2352 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2353 result = that.type = types.createErrorType(pt());
2354 return;
2355 }
2357 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2358 //add param type info in the AST
2359 List<Type> actuals = lambdaType.getParameterTypes();
2360 List<JCVariableDecl> params = that.params;
2362 boolean arityMismatch = false;
2364 while (params.nonEmpty()) {
2365 if (actuals.isEmpty()) {
2366 //not enough actuals to perform lambda parameter inference
2367 arityMismatch = true;
2368 }
2369 //reset previously set info
2370 Type argType = arityMismatch ?
2371 syms.errType :
2372 actuals.head;
2373 params.head.vartype = make.at(params.head).Type(argType);
2374 params.head.sym = null;
2375 actuals = actuals.isEmpty() ?
2376 actuals :
2377 actuals.tail;
2378 params = params.tail;
2379 }
2381 //attribute lambda parameters
2382 attribStats(that.params, localEnv);
2384 if (arityMismatch) {
2385 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2386 result = that.type = types.createErrorType(currentTarget);
2387 return;
2388 }
2389 }
2391 //from this point on, no recovery is needed; if we are in assignment context
2392 //we will be able to attribute the whole lambda body, regardless of errors;
2393 //if we are in a 'check' method context, and the lambda is not compatible
2394 //with the target-type, it will be recovered anyway in Attr.checkId
2395 needsRecovery = false;
2397 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2398 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2399 new FunctionalReturnContext(resultInfo.checkContext);
2401 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2402 recoveryInfo :
2403 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2404 localEnv.info.returnResult = bodyResultInfo;
2406 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2407 attribTree(that.getBody(), localEnv, bodyResultInfo);
2408 } else {
2409 JCBlock body = (JCBlock)that.body;
2410 attribStats(body.stats, localEnv);
2411 }
2413 result = check(that, currentTarget, VAL, resultInfo);
2415 boolean isSpeculativeRound =
2416 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2418 preFlow(that);
2419 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2421 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2423 if (!isSpeculativeRound) {
2424 //add thrown types as bounds to the thrown types free variables if needed:
2425 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2426 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2427 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asFree(lambdaType.getThrownTypes());
2429 chk.unhandled(inferredThrownTypes, thrownTypes);
2430 }
2432 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2433 }
2434 result = check(that, currentTarget, VAL, resultInfo);
2435 } catch (Types.FunctionDescriptorLookupError ex) {
2436 JCDiagnostic cause = ex.getDiagnostic();
2437 resultInfo.checkContext.report(that, cause);
2438 result = that.type = types.createErrorType(pt());
2439 return;
2440 } finally {
2441 localEnv.info.scope.leave();
2442 if (needsRecovery) {
2443 attribTree(that, env, recoveryInfo);
2444 }
2445 }
2446 }
2447 //where
2448 void preFlow(JCLambda tree) {
2449 new PostAttrAnalyzer() {
2450 @Override
2451 public void scan(JCTree tree) {
2452 if (tree == null ||
2453 (tree.type != null &&
2454 tree.type == Type.stuckType)) {
2455 //don't touch stuck expressions!
2456 return;
2457 }
2458 super.scan(tree);
2459 }
2460 }.scan(tree);
2461 }
2463 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2465 @Override
2466 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2467 return t.isCompound() ?
2468 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2469 }
2471 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2472 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2473 Type target = null;
2474 for (Type bound : ict.getExplicitComponents()) {
2475 TypeSymbol boundSym = bound.tsym;
2476 if (types.isFunctionalInterface(boundSym) &&
2477 types.findDescriptorSymbol(boundSym) == desc) {
2478 target = bound;
2479 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2480 //bound must be an interface
2481 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2482 }
2483 }
2484 return target != null ?
2485 target :
2486 ict.getExplicitComponents().head; //error recovery
2487 }
2489 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2490 ListBuffer<Type> targs = ListBuffer.lb();
2491 ListBuffer<Type> supertypes = ListBuffer.lb();
2492 for (Type i : ict.interfaces_field) {
2493 if (i.isParameterized()) {
2494 targs.appendList(i.tsym.type.allparams());
2495 }
2496 supertypes.append(i.tsym.type);
2497 }
2498 IntersectionClassType notionalIntf =
2499 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2500 notionalIntf.allparams_field = targs.toList();
2501 notionalIntf.tsym.flags_field |= INTERFACE;
2502 return notionalIntf.tsym;
2503 }
2505 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2506 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2507 diags.fragment(key, args)));
2508 }
2509 };
2511 private Type fallbackDescriptorType(JCExpression tree) {
2512 switch (tree.getTag()) {
2513 case LAMBDA:
2514 JCLambda lambda = (JCLambda)tree;
2515 List<Type> argtypes = List.nil();
2516 for (JCVariableDecl param : lambda.params) {
2517 argtypes = param.vartype != null ?
2518 argtypes.append(param.vartype.type) :
2519 argtypes.append(syms.errType);
2520 }
2521 return new MethodType(argtypes, Type.recoveryType,
2522 List.of(syms.throwableType), syms.methodClass);
2523 case REFERENCE:
2524 return new MethodType(List.<Type>nil(), Type.recoveryType,
2525 List.of(syms.throwableType), syms.methodClass);
2526 default:
2527 Assert.error("Cannot get here!");
2528 }
2529 return null;
2530 }
2532 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2533 final InferenceContext inferenceContext, final Type... ts) {
2534 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2535 }
2537 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2538 final InferenceContext inferenceContext, final List<Type> ts) {
2539 if (inferenceContext.free(ts)) {
2540 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2541 @Override
2542 public void typesInferred(InferenceContext inferenceContext) {
2543 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2544 }
2545 });
2546 } else {
2547 for (Type t : ts) {
2548 rs.checkAccessibleType(env, t);
2549 }
2550 }
2551 }
2553 /**
2554 * Lambda/method reference have a special check context that ensures
2555 * that i.e. a lambda return type is compatible with the expected
2556 * type according to both the inherited context and the assignment
2557 * context.
2558 */
2559 class FunctionalReturnContext extends Check.NestedCheckContext {
2561 FunctionalReturnContext(CheckContext enclosingContext) {
2562 super(enclosingContext);
2563 }
2565 @Override
2566 public boolean compatible(Type found, Type req, Warner warn) {
2567 //return type must be compatible in both current context and assignment context
2568 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2569 }
2571 @Override
2572 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2573 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2574 }
2575 }
2577 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2579 JCExpression expr;
2581 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2582 super(enclosingContext);
2583 this.expr = expr;
2584 }
2586 @Override
2587 public boolean compatible(Type found, Type req, Warner warn) {
2588 //a void return is compatible with an expression statement lambda
2589 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2590 super.compatible(found, req, warn);
2591 }
2592 }
2594 /**
2595 * Lambda compatibility. Check that given return types, thrown types, parameter types
2596 * are compatible with the expected functional interface descriptor. This means that:
2597 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2598 * types must be compatible with the return type of the expected descriptor.
2599 */
2600 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2601 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2603 //return values have already been checked - but if lambda has no return
2604 //values, we must ensure that void/value compatibility is correct;
2605 //this amounts at checking that, if a lambda body can complete normally,
2606 //the descriptor's return type must be void
2607 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2608 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2609 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2610 diags.fragment("missing.ret.val", returnType)));
2611 }
2613 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2614 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2615 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2616 }
2617 }
2619 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2620 Env<AttrContext> lambdaEnv;
2621 Symbol owner = env.info.scope.owner;
2622 if (owner.kind == VAR && owner.owner.kind == TYP) {
2623 //field initializer
2624 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2625 lambdaEnv.info.scope.owner =
2626 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2627 env.info.scope.owner);
2628 } else {
2629 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2630 }
2631 return lambdaEnv;
2632 }
2634 @Override
2635 public void visitReference(final JCMemberReference that) {
2636 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2637 if (pt().hasTag(NONE)) {
2638 //method reference only allowed in assignment or method invocation/cast context
2639 log.error(that.pos(), "unexpected.mref");
2640 }
2641 result = that.type = types.createErrorType(pt());
2642 return;
2643 }
2644 final Env<AttrContext> localEnv = env.dup(that);
2645 try {
2646 //attribute member reference qualifier - if this is a constructor
2647 //reference, the expected kind must be a type
2648 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2650 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2651 exprType = chk.checkConstructorRefType(that.expr, exprType);
2652 if (!exprType.isErroneous() &&
2653 exprType.isRaw() &&
2654 that.typeargs != null) {
2655 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2656 diags.fragment("mref.infer.and.explicit.params"));
2657 exprType = types.createErrorType(exprType);
2658 }
2659 }
2661 if (exprType.isErroneous()) {
2662 //if the qualifier expression contains problems,
2663 //give up attribution of method reference
2664 result = that.type = exprType;
2665 return;
2666 }
2668 if (TreeInfo.isStaticSelector(that.expr, names)) {
2669 //if the qualifier is a type, validate it; raw warning check is
2670 //omitted as we don't know at this stage as to whether this is a
2671 //raw selector (because of inference)
2672 chk.validate(that.expr, env, false);
2673 }
2675 //attrib type-arguments
2676 List<Type> typeargtypes = List.nil();
2677 if (that.typeargs != null) {
2678 typeargtypes = attribTypes(that.typeargs, localEnv);
2679 }
2681 Type target;
2682 Type desc;
2683 if (pt() != Type.recoveryType) {
2684 target = targetChecker.visit(pt(), that);
2685 desc = types.findDescriptorType(target);
2686 } else {
2687 target = Type.recoveryType;
2688 desc = fallbackDescriptorType(that);
2689 }
2691 setFunctionalInfo(localEnv, that, pt(), desc, target, resultInfo.checkContext);
2692 List<Type> argtypes = desc.getParameterTypes();
2693 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2695 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2696 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2697 }
2699 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2700 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2701 try {
2702 refResult = rs.resolveMemberReference(that.pos(), localEnv, that, that.expr.type,
2703 that.name, argtypes, typeargtypes, true, referenceCheck,
2704 resultInfo.checkContext.inferenceContext());
2705 } finally {
2706 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2707 }
2709 Symbol refSym = refResult.fst;
2710 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2712 if (refSym.kind != MTH) {
2713 boolean targetError;
2714 switch (refSym.kind) {
2715 case ABSENT_MTH:
2716 targetError = false;
2717 break;
2718 case WRONG_MTH:
2719 case WRONG_MTHS:
2720 case AMBIGUOUS:
2721 case HIDDEN:
2722 case STATICERR:
2723 case MISSING_ENCL:
2724 targetError = true;
2725 break;
2726 default:
2727 Assert.error("unexpected result kind " + refSym.kind);
2728 targetError = false;
2729 }
2731 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2732 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2734 JCDiagnostic.DiagnosticType diagKind = targetError ?
2735 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2737 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2738 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2740 if (targetError && target == Type.recoveryType) {
2741 //a target error doesn't make sense during recovery stage
2742 //as we don't know what actual parameter types are
2743 result = that.type = target;
2744 return;
2745 } else {
2746 if (targetError) {
2747 resultInfo.checkContext.report(that, diag);
2748 } else {
2749 log.report(diag);
2750 }
2751 result = that.type = types.createErrorType(target);
2752 return;
2753 }
2754 }
2756 that.sym = refSym.baseSymbol();
2757 that.kind = lookupHelper.referenceKind(that.sym);
2758 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2760 if (desc.getReturnType() == Type.recoveryType) {
2761 // stop here
2762 result = that.type = target;
2763 return;
2764 }
2766 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2768 if (that.getMode() == ReferenceMode.INVOKE &&
2769 TreeInfo.isStaticSelector(that.expr, names) &&
2770 that.kind.isUnbound() &&
2771 !desc.getParameterTypes().head.isParameterized()) {
2772 chk.checkRaw(that.expr, localEnv);
2773 }
2775 if (!that.kind.isUnbound() &&
2776 that.getMode() == ReferenceMode.INVOKE &&
2777 TreeInfo.isStaticSelector(that.expr, names) &&
2778 !that.sym.isStatic()) {
2779 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2780 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2781 result = that.type = types.createErrorType(target);
2782 return;
2783 }
2785 if (that.kind.isUnbound() &&
2786 that.getMode() == ReferenceMode.INVOKE &&
2787 TreeInfo.isStaticSelector(that.expr, names) &&
2788 that.sym.isStatic()) {
2789 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2790 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2791 result = that.type = types.createErrorType(target);
2792 return;
2793 }
2795 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2796 exprType.getTypeArguments().nonEmpty()) {
2797 //static ref with class type-args
2798 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2799 diags.fragment("static.mref.with.targs"));
2800 result = that.type = types.createErrorType(target);
2801 return;
2802 }
2804 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2805 !that.kind.isUnbound()) {
2806 //no static bound mrefs
2807 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2808 diags.fragment("static.bound.mref"));
2809 result = that.type = types.createErrorType(target);
2810 return;
2811 }
2813 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2814 // Check that super-qualified symbols are not abstract (JLS)
2815 rs.checkNonAbstract(that.pos(), that.sym);
2816 }
2817 }
2819 ResultInfo checkInfo =
2820 resultInfo.dup(newMethodTemplate(
2821 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2822 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes));
2824 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2826 if (that.kind.isUnbound() &&
2827 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2828 //re-generate inference constraints for unbound receiver
2829 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asFree(argtypes.head), exprType)) {
2830 //cannot happen as this has already been checked - we just need
2831 //to regenerate the inference constraints, as that has been lost
2832 //as a result of the call to inferenceContext.save()
2833 Assert.error("Can't get here");
2834 }
2835 }
2837 if (!refType.isErroneous()) {
2838 refType = types.createMethodTypeWithReturn(refType,
2839 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2840 }
2842 //go ahead with standard method reference compatibility check - note that param check
2843 //is a no-op (as this has been taken care during method applicability)
2844 boolean isSpeculativeRound =
2845 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2846 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2847 if (!isSpeculativeRound) {
2848 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2849 }
2850 result = check(that, target, VAL, resultInfo);
2851 } catch (Types.FunctionDescriptorLookupError ex) {
2852 JCDiagnostic cause = ex.getDiagnostic();
2853 resultInfo.checkContext.report(that, cause);
2854 result = that.type = types.createErrorType(pt());
2855 return;
2856 }
2857 }
2858 //where
2859 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2860 //if this is a constructor reference, the expected kind must be a type
2861 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2862 }
2865 @SuppressWarnings("fallthrough")
2866 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2867 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2869 Type resType;
2870 switch (tree.getMode()) {
2871 case NEW:
2872 if (!tree.expr.type.isRaw()) {
2873 resType = tree.expr.type;
2874 break;
2875 }
2876 default:
2877 resType = refType.getReturnType();
2878 }
2880 Type incompatibleReturnType = resType;
2882 if (returnType.hasTag(VOID)) {
2883 incompatibleReturnType = null;
2884 }
2886 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2887 if (resType.isErroneous() ||
2888 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2889 incompatibleReturnType = null;
2890 }
2891 }
2893 if (incompatibleReturnType != null) {
2894 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2895 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2896 }
2898 if (!speculativeAttr) {
2899 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2900 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2901 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2902 }
2903 }
2904 }
2906 /**
2907 * Set functional type info on the underlying AST. Note: as the target descriptor
2908 * might contain inference variables, we might need to register an hook in the
2909 * current inference context.
2910 */
2911 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2912 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2913 if (checkContext.inferenceContext().free(descriptorType)) {
2914 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2915 public void typesInferred(InferenceContext inferenceContext) {
2916 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2917 inferenceContext.asInstType(primaryTarget), checkContext);
2918 }
2919 });
2920 } else {
2921 ListBuffer<Type> targets = ListBuffer.lb();
2922 if (pt.hasTag(CLASS)) {
2923 if (pt.isCompound()) {
2924 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2925 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2926 if (t != primaryTarget) {
2927 targets.append(types.removeWildcards(t));
2928 }
2929 }
2930 } else {
2931 targets.append(types.removeWildcards(primaryTarget));
2932 }
2933 }
2934 fExpr.targets = targets.toList();
2935 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2936 pt != Type.recoveryType) {
2937 //check that functional interface class is well-formed
2938 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2939 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2940 if (csym != null) {
2941 chk.checkImplementations(env.tree, csym, csym);
2942 }
2943 }
2944 }
2945 }
2947 public void visitParens(JCParens tree) {
2948 Type owntype = attribTree(tree.expr, env, resultInfo);
2949 result = check(tree, owntype, pkind(), resultInfo);
2950 Symbol sym = TreeInfo.symbol(tree);
2951 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2952 log.error(tree.pos(), "illegal.start.of.type");
2953 }
2955 public void visitAssign(JCAssign tree) {
2956 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2957 Type capturedType = capture(owntype);
2958 attribExpr(tree.rhs, env, owntype);
2959 result = check(tree, capturedType, VAL, resultInfo);
2960 }
2962 public void visitAssignop(JCAssignOp tree) {
2963 // Attribute arguments.
2964 Type owntype = attribTree(tree.lhs, env, varInfo);
2965 Type operand = attribExpr(tree.rhs, env);
2966 // Find operator.
2967 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2968 tree.pos(), tree.getTag().noAssignOp(), env,
2969 owntype, operand);
2971 if (operator.kind == MTH &&
2972 !owntype.isErroneous() &&
2973 !operand.isErroneous()) {
2974 chk.checkOperator(tree.pos(),
2975 (OperatorSymbol)operator,
2976 tree.getTag().noAssignOp(),
2977 owntype,
2978 operand);
2979 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2980 chk.checkCastable(tree.rhs.pos(),
2981 operator.type.getReturnType(),
2982 owntype);
2983 }
2984 result = check(tree, owntype, VAL, resultInfo);
2985 }
2987 public void visitUnary(JCUnary tree) {
2988 // Attribute arguments.
2989 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2990 ? attribTree(tree.arg, env, varInfo)
2991 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2993 // Find operator.
2994 Symbol operator = tree.operator =
2995 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2997 Type owntype = types.createErrorType(tree.type);
2998 if (operator.kind == MTH &&
2999 !argtype.isErroneous()) {
3000 owntype = (tree.getTag().isIncOrDecUnaryOp())
3001 ? tree.arg.type
3002 : operator.type.getReturnType();
3003 int opc = ((OperatorSymbol)operator).opcode;
3005 // If the argument is constant, fold it.
3006 if (argtype.constValue() != null) {
3007 Type ctype = cfolder.fold1(opc, argtype);
3008 if (ctype != null) {
3009 owntype = cfolder.coerce(ctype, owntype);
3011 // Remove constant types from arguments to
3012 // conserve space. The parser will fold concatenations
3013 // of string literals; the code here also
3014 // gets rid of intermediate results when some of the
3015 // operands are constant identifiers.
3016 if (tree.arg.type.tsym == syms.stringType.tsym) {
3017 tree.arg.type = syms.stringType;
3018 }
3019 }
3020 }
3021 }
3022 result = check(tree, owntype, VAL, resultInfo);
3023 }
3025 public void visitBinary(JCBinary tree) {
3026 // Attribute arguments.
3027 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3028 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3030 // Find operator.
3031 Symbol operator = tree.operator =
3032 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3034 Type owntype = types.createErrorType(tree.type);
3035 if (operator.kind == MTH &&
3036 !left.isErroneous() &&
3037 !right.isErroneous()) {
3038 owntype = operator.type.getReturnType();
3039 // This will figure out when unboxing can happen and
3040 // choose the right comparison operator.
3041 int opc = chk.checkOperator(tree.lhs.pos(),
3042 (OperatorSymbol)operator,
3043 tree.getTag(),
3044 left,
3045 right);
3047 // If both arguments are constants, fold them.
3048 if (left.constValue() != null && right.constValue() != null) {
3049 Type ctype = cfolder.fold2(opc, left, right);
3050 if (ctype != null) {
3051 owntype = cfolder.coerce(ctype, owntype);
3053 // Remove constant types from arguments to
3054 // conserve space. The parser will fold concatenations
3055 // of string literals; the code here also
3056 // gets rid of intermediate results when some of the
3057 // operands are constant identifiers.
3058 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3059 tree.lhs.type = syms.stringType;
3060 }
3061 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3062 tree.rhs.type = syms.stringType;
3063 }
3064 }
3065 }
3067 // Check that argument types of a reference ==, != are
3068 // castable to each other, (JLS 15.21). Note: unboxing
3069 // comparisons will not have an acmp* opc at this point.
3070 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3071 if (!types.isEqualityComparable(left, right,
3072 new Warner(tree.pos()))) {
3073 log.error(tree.pos(), "incomparable.types", left, right);
3074 }
3075 }
3077 chk.checkDivZero(tree.rhs.pos(), operator, right);
3078 }
3079 result = check(tree, owntype, VAL, resultInfo);
3080 }
3082 public void visitTypeCast(final JCTypeCast tree) {
3083 Type clazztype = attribType(tree.clazz, env);
3084 chk.validate(tree.clazz, env, false);
3085 //a fresh environment is required for 292 inference to work properly ---
3086 //see Infer.instantiatePolymorphicSignatureInstance()
3087 Env<AttrContext> localEnv = env.dup(tree);
3088 //should we propagate the target type?
3089 final ResultInfo castInfo;
3090 JCExpression expr = TreeInfo.skipParens(tree.expr);
3091 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3092 if (isPoly) {
3093 //expression is a poly - we need to propagate target type info
3094 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3095 @Override
3096 public boolean compatible(Type found, Type req, Warner warn) {
3097 return types.isCastable(found, req, warn);
3098 }
3099 });
3100 } else {
3101 //standalone cast - target-type info is not propagated
3102 castInfo = unknownExprInfo;
3103 }
3104 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3105 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3106 if (exprtype.constValue() != null)
3107 owntype = cfolder.coerce(exprtype, owntype);
3108 result = check(tree, capture(owntype), VAL, resultInfo);
3109 if (!isPoly)
3110 chk.checkRedundantCast(localEnv, tree);
3111 }
3113 public void visitTypeTest(JCInstanceOf tree) {
3114 Type exprtype = chk.checkNullOrRefType(
3115 tree.expr.pos(), attribExpr(tree.expr, env));
3116 Type clazztype = chk.checkReifiableReferenceType(
3117 tree.clazz.pos(), attribType(tree.clazz, env));
3118 chk.validate(tree.clazz, env, false);
3119 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3120 result = check(tree, syms.booleanType, VAL, resultInfo);
3121 }
3123 public void visitIndexed(JCArrayAccess tree) {
3124 Type owntype = types.createErrorType(tree.type);
3125 Type atype = attribExpr(tree.indexed, env);
3126 attribExpr(tree.index, env, syms.intType);
3127 if (types.isArray(atype))
3128 owntype = types.elemtype(atype);
3129 else if (!atype.hasTag(ERROR))
3130 log.error(tree.pos(), "array.req.but.found", atype);
3131 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3132 result = check(tree, owntype, VAR, resultInfo);
3133 }
3135 public void visitIdent(JCIdent tree) {
3136 Symbol sym;
3138 // Find symbol
3139 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3140 // If we are looking for a method, the prototype `pt' will be a
3141 // method type with the type of the call's arguments as parameters.
3142 env.info.pendingResolutionPhase = null;
3143 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3144 } else if (tree.sym != null && tree.sym.kind != VAR) {
3145 sym = tree.sym;
3146 } else {
3147 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3148 }
3149 tree.sym = sym;
3151 // (1) Also find the environment current for the class where
3152 // sym is defined (`symEnv').
3153 // Only for pre-tiger versions (1.4 and earlier):
3154 // (2) Also determine whether we access symbol out of an anonymous
3155 // class in a this or super call. This is illegal for instance
3156 // members since such classes don't carry a this$n link.
3157 // (`noOuterThisPath').
3158 Env<AttrContext> symEnv = env;
3159 boolean noOuterThisPath = false;
3160 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3161 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3162 sym.owner.kind == TYP &&
3163 tree.name != names._this && tree.name != names._super) {
3165 // Find environment in which identifier is defined.
3166 while (symEnv.outer != null &&
3167 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3168 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3169 noOuterThisPath = !allowAnonOuterThis;
3170 symEnv = symEnv.outer;
3171 }
3172 }
3174 // If symbol is a variable, ...
3175 if (sym.kind == VAR) {
3176 VarSymbol v = (VarSymbol)sym;
3178 // ..., evaluate its initializer, if it has one, and check for
3179 // illegal forward reference.
3180 checkInit(tree, env, v, false);
3182 // If we are expecting a variable (as opposed to a value), check
3183 // that the variable is assignable in the current environment.
3184 if (pkind() == VAR)
3185 checkAssignable(tree.pos(), v, null, env);
3186 }
3188 // In a constructor body,
3189 // if symbol is a field or instance method, check that it is
3190 // not accessed before the supertype constructor is called.
3191 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3192 (sym.kind & (VAR | MTH)) != 0 &&
3193 sym.owner.kind == TYP &&
3194 (sym.flags() & STATIC) == 0) {
3195 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3196 }
3197 Env<AttrContext> env1 = env;
3198 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3199 // If the found symbol is inaccessible, then it is
3200 // accessed through an enclosing instance. Locate this
3201 // enclosing instance:
3202 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3203 env1 = env1.outer;
3204 }
3205 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3206 }
3208 public void visitSelect(JCFieldAccess tree) {
3209 // Determine the expected kind of the qualifier expression.
3210 int skind = 0;
3211 if (tree.name == names._this || tree.name == names._super ||
3212 tree.name == names._class)
3213 {
3214 skind = TYP;
3215 } else {
3216 if ((pkind() & PCK) != 0) skind = skind | PCK;
3217 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3218 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3219 }
3221 // Attribute the qualifier expression, and determine its symbol (if any).
3222 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3223 if ((pkind() & (PCK | TYP)) == 0)
3224 site = capture(site); // Capture field access
3226 // don't allow T.class T[].class, etc
3227 if (skind == TYP) {
3228 Type elt = site;
3229 while (elt.hasTag(ARRAY))
3230 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3231 if (elt.hasTag(TYPEVAR)) {
3232 log.error(tree.pos(), "type.var.cant.be.deref");
3233 result = types.createErrorType(tree.type);
3234 return;
3235 }
3236 }
3238 // If qualifier symbol is a type or `super', assert `selectSuper'
3239 // for the selection. This is relevant for determining whether
3240 // protected symbols are accessible.
3241 Symbol sitesym = TreeInfo.symbol(tree.selected);
3242 boolean selectSuperPrev = env.info.selectSuper;
3243 env.info.selectSuper =
3244 sitesym != null &&
3245 sitesym.name == names._super;
3247 // Determine the symbol represented by the selection.
3248 env.info.pendingResolutionPhase = null;
3249 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3250 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3251 site = capture(site);
3252 sym = selectSym(tree, sitesym, site, env, resultInfo);
3253 }
3254 boolean varArgs = env.info.lastResolveVarargs();
3255 tree.sym = sym;
3257 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3258 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3259 site = capture(site);
3260 }
3262 // If that symbol is a variable, ...
3263 if (sym.kind == VAR) {
3264 VarSymbol v = (VarSymbol)sym;
3266 // ..., evaluate its initializer, if it has one, and check for
3267 // illegal forward reference.
3268 checkInit(tree, env, v, true);
3270 // If we are expecting a variable (as opposed to a value), check
3271 // that the variable is assignable in the current environment.
3272 if (pkind() == VAR)
3273 checkAssignable(tree.pos(), v, tree.selected, env);
3274 }
3276 if (sitesym != null &&
3277 sitesym.kind == VAR &&
3278 ((VarSymbol)sitesym).isResourceVariable() &&
3279 sym.kind == MTH &&
3280 sym.name.equals(names.close) &&
3281 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3282 env.info.lint.isEnabled(LintCategory.TRY)) {
3283 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3284 }
3286 // Disallow selecting a type from an expression
3287 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3288 tree.type = check(tree.selected, pt(),
3289 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3290 }
3292 if (isType(sitesym)) {
3293 if (sym.name == names._this) {
3294 // If `C' is the currently compiled class, check that
3295 // C.this' does not appear in a call to a super(...)
3296 if (env.info.isSelfCall &&
3297 site.tsym == env.enclClass.sym) {
3298 chk.earlyRefError(tree.pos(), sym);
3299 }
3300 } else {
3301 // Check if type-qualified fields or methods are static (JLS)
3302 if ((sym.flags() & STATIC) == 0 &&
3303 !env.next.tree.hasTag(REFERENCE) &&
3304 sym.name != names._super &&
3305 (sym.kind == VAR || sym.kind == MTH)) {
3306 rs.accessBase(rs.new StaticError(sym),
3307 tree.pos(), site, sym.name, true);
3308 }
3309 }
3310 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3311 // If the qualified item is not a type and the selected item is static, report
3312 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3313 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3314 }
3316 // If we are selecting an instance member via a `super', ...
3317 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3319 // Check that super-qualified symbols are not abstract (JLS)
3320 rs.checkNonAbstract(tree.pos(), sym);
3322 if (site.isRaw()) {
3323 // Determine argument types for site.
3324 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3325 if (site1 != null) site = site1;
3326 }
3327 }
3329 env.info.selectSuper = selectSuperPrev;
3330 result = checkId(tree, site, sym, env, resultInfo);
3331 }
3332 //where
3333 /** Determine symbol referenced by a Select expression,
3334 *
3335 * @param tree The select tree.
3336 * @param site The type of the selected expression,
3337 * @param env The current environment.
3338 * @param resultInfo The current result.
3339 */
3340 private Symbol selectSym(JCFieldAccess tree,
3341 Symbol location,
3342 Type site,
3343 Env<AttrContext> env,
3344 ResultInfo resultInfo) {
3345 DiagnosticPosition pos = tree.pos();
3346 Name name = tree.name;
3347 switch (site.getTag()) {
3348 case PACKAGE:
3349 return rs.accessBase(
3350 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3351 pos, location, site, name, true);
3352 case ARRAY:
3353 case CLASS:
3354 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3355 return rs.resolveQualifiedMethod(
3356 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3357 } else if (name == names._this || name == names._super) {
3358 return rs.resolveSelf(pos, env, site.tsym, name);
3359 } else if (name == names._class) {
3360 // In this case, we have already made sure in
3361 // visitSelect that qualifier expression is a type.
3362 Type t = syms.classType;
3363 List<Type> typeargs = allowGenerics
3364 ? List.of(types.erasure(site))
3365 : List.<Type>nil();
3366 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3367 return new VarSymbol(
3368 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3369 } else {
3370 // We are seeing a plain identifier as selector.
3371 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3372 if ((resultInfo.pkind & ERRONEOUS) == 0)
3373 sym = rs.accessBase(sym, pos, location, site, name, true);
3374 return sym;
3375 }
3376 case WILDCARD:
3377 throw new AssertionError(tree);
3378 case TYPEVAR:
3379 // Normally, site.getUpperBound() shouldn't be null.
3380 // It should only happen during memberEnter/attribBase
3381 // when determining the super type which *must* beac
3382 // done before attributing the type variables. In
3383 // other words, we are seeing this illegal program:
3384 // class B<T> extends A<T.foo> {}
3385 Symbol sym = (site.getUpperBound() != null)
3386 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3387 : null;
3388 if (sym == null) {
3389 log.error(pos, "type.var.cant.be.deref");
3390 return syms.errSymbol;
3391 } else {
3392 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3393 rs.new AccessError(env, site, sym) :
3394 sym;
3395 rs.accessBase(sym2, pos, location, site, name, true);
3396 return sym;
3397 }
3398 case ERROR:
3399 // preserve identifier names through errors
3400 return types.createErrorType(name, site.tsym, site).tsym;
3401 default:
3402 // The qualifier expression is of a primitive type -- only
3403 // .class is allowed for these.
3404 if (name == names._class) {
3405 // In this case, we have already made sure in Select that
3406 // qualifier expression is a type.
3407 Type t = syms.classType;
3408 Type arg = types.boxedClass(site).type;
3409 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3410 return new VarSymbol(
3411 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3412 } else {
3413 log.error(pos, "cant.deref", site);
3414 return syms.errSymbol;
3415 }
3416 }
3417 }
3419 /** Determine type of identifier or select expression and check that
3420 * (1) the referenced symbol is not deprecated
3421 * (2) the symbol's type is safe (@see checkSafe)
3422 * (3) if symbol is a variable, check that its type and kind are
3423 * compatible with the prototype and protokind.
3424 * (4) if symbol is an instance field of a raw type,
3425 * which is being assigned to, issue an unchecked warning if its
3426 * type changes under erasure.
3427 * (5) if symbol is an instance method of a raw type, issue an
3428 * unchecked warning if its argument types change under erasure.
3429 * If checks succeed:
3430 * If symbol is a constant, return its constant type
3431 * else if symbol is a method, return its result type
3432 * otherwise return its type.
3433 * Otherwise return errType.
3434 *
3435 * @param tree The syntax tree representing the identifier
3436 * @param site If this is a select, the type of the selected
3437 * expression, otherwise the type of the current class.
3438 * @param sym The symbol representing the identifier.
3439 * @param env The current environment.
3440 * @param resultInfo The expected result
3441 */
3442 Type checkId(JCTree tree,
3443 Type site,
3444 Symbol sym,
3445 Env<AttrContext> env,
3446 ResultInfo resultInfo) {
3447 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3448 checkMethodId(tree, site, sym, env, resultInfo) :
3449 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3450 }
3452 Type checkMethodId(JCTree tree,
3453 Type site,
3454 Symbol sym,
3455 Env<AttrContext> env,
3456 ResultInfo resultInfo) {
3457 boolean isPolymorhicSignature =
3458 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3459 return isPolymorhicSignature ?
3460 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3461 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3462 }
3464 Type checkSigPolyMethodId(JCTree tree,
3465 Type site,
3466 Symbol sym,
3467 Env<AttrContext> env,
3468 ResultInfo resultInfo) {
3469 //recover original symbol for signature polymorphic methods
3470 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3471 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3472 return sym.type;
3473 }
3475 Type checkMethodIdInternal(JCTree tree,
3476 Type site,
3477 Symbol sym,
3478 Env<AttrContext> env,
3479 ResultInfo resultInfo) {
3480 if ((resultInfo.pkind & POLY) != 0) {
3481 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3482 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3483 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3484 return owntype;
3485 } else {
3486 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3487 }
3488 }
3490 Type checkIdInternal(JCTree tree,
3491 Type site,
3492 Symbol sym,
3493 Type pt,
3494 Env<AttrContext> env,
3495 ResultInfo resultInfo) {
3496 if (pt.isErroneous()) {
3497 return types.createErrorType(site);
3498 }
3499 Type owntype; // The computed type of this identifier occurrence.
3500 switch (sym.kind) {
3501 case TYP:
3502 // For types, the computed type equals the symbol's type,
3503 // except for two situations:
3504 owntype = sym.type;
3505 if (owntype.hasTag(CLASS)) {
3506 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3507 Type ownOuter = owntype.getEnclosingType();
3509 // (a) If the symbol's type is parameterized, erase it
3510 // because no type parameters were given.
3511 // We recover generic outer type later in visitTypeApply.
3512 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3513 owntype = types.erasure(owntype);
3514 }
3516 // (b) If the symbol's type is an inner class, then
3517 // we have to interpret its outer type as a superclass
3518 // of the site type. Example:
3519 //
3520 // class Tree<A> { class Visitor { ... } }
3521 // class PointTree extends Tree<Point> { ... }
3522 // ...PointTree.Visitor...
3523 //
3524 // Then the type of the last expression above is
3525 // Tree<Point>.Visitor.
3526 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3527 Type normOuter = site;
3528 if (normOuter.hasTag(CLASS)) {
3529 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3530 if (site.isAnnotated()) {
3531 // Propagate any type annotations.
3532 // TODO: should asEnclosingSuper do this?
3533 // Note that the type annotations in site will be updated
3534 // by annotateType. Therefore, modify site instead
3535 // of creating a new AnnotatedType.
3536 ((AnnotatedType)site).underlyingType = normOuter;
3537 normOuter = site;
3538 }
3539 }
3540 if (normOuter == null) // perhaps from an import
3541 normOuter = types.erasure(ownOuter);
3542 if (normOuter != ownOuter)
3543 owntype = new ClassType(
3544 normOuter, List.<Type>nil(), owntype.tsym);
3545 }
3546 }
3547 break;
3548 case VAR:
3549 VarSymbol v = (VarSymbol)sym;
3550 // Test (4): if symbol is an instance field of a raw type,
3551 // which is being assigned to, issue an unchecked warning if
3552 // its type changes under erasure.
3553 if (allowGenerics &&
3554 resultInfo.pkind == VAR &&
3555 v.owner.kind == TYP &&
3556 (v.flags() & STATIC) == 0 &&
3557 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3558 Type s = types.asOuterSuper(site, v.owner);
3559 if (s != null &&
3560 s.isRaw() &&
3561 !types.isSameType(v.type, v.erasure(types))) {
3562 chk.warnUnchecked(tree.pos(),
3563 "unchecked.assign.to.var",
3564 v, s);
3565 }
3566 }
3567 // The computed type of a variable is the type of the
3568 // variable symbol, taken as a member of the site type.
3569 owntype = (sym.owner.kind == TYP &&
3570 sym.name != names._this && sym.name != names._super)
3571 ? types.memberType(site, sym)
3572 : sym.type;
3574 // If the variable is a constant, record constant value in
3575 // computed type.
3576 if (v.getConstValue() != null && isStaticReference(tree))
3577 owntype = owntype.constType(v.getConstValue());
3579 if (resultInfo.pkind == VAL) {
3580 owntype = capture(owntype); // capture "names as expressions"
3581 }
3582 break;
3583 case MTH: {
3584 owntype = checkMethod(site, sym,
3585 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3586 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3587 resultInfo.pt.getTypeArguments());
3588 break;
3589 }
3590 case PCK: case ERR:
3591 owntype = sym.type;
3592 break;
3593 default:
3594 throw new AssertionError("unexpected kind: " + sym.kind +
3595 " in tree " + tree);
3596 }
3598 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3599 // (for constructors, the error was given when the constructor was
3600 // resolved)
3602 if (sym.name != names.init) {
3603 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3604 chk.checkSunAPI(tree.pos(), sym);
3605 chk.checkProfile(tree.pos(), sym);
3606 }
3608 // Test (3): if symbol is a variable, check that its type and
3609 // kind are compatible with the prototype and protokind.
3610 return check(tree, owntype, sym.kind, resultInfo);
3611 }
3613 /** Check that variable is initialized and evaluate the variable's
3614 * initializer, if not yet done. Also check that variable is not
3615 * referenced before it is defined.
3616 * @param tree The tree making up the variable reference.
3617 * @param env The current environment.
3618 * @param v The variable's symbol.
3619 */
3620 private void checkInit(JCTree tree,
3621 Env<AttrContext> env,
3622 VarSymbol v,
3623 boolean onlyWarning) {
3624 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3625 // tree.pos + " " + v.pos + " " +
3626 // Resolve.isStatic(env));//DEBUG
3628 // A forward reference is diagnosed if the declaration position
3629 // of the variable is greater than the current tree position
3630 // and the tree and variable definition occur in the same class
3631 // definition. Note that writes don't count as references.
3632 // This check applies only to class and instance
3633 // variables. Local variables follow different scope rules,
3634 // and are subject to definite assignment checking.
3635 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3636 v.owner.kind == TYP &&
3637 canOwnInitializer(owner(env)) &&
3638 v.owner == env.info.scope.owner.enclClass() &&
3639 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3640 (!env.tree.hasTag(ASSIGN) ||
3641 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3642 String suffix = (env.info.enclVar == v) ?
3643 "self.ref" : "forward.ref";
3644 if (!onlyWarning || isStaticEnumField(v)) {
3645 log.error(tree.pos(), "illegal." + suffix);
3646 } else if (useBeforeDeclarationWarning) {
3647 log.warning(tree.pos(), suffix, v);
3648 }
3649 }
3651 v.getConstValue(); // ensure initializer is evaluated
3653 checkEnumInitializer(tree, env, v);
3654 }
3656 /**
3657 * Check for illegal references to static members of enum. In
3658 * an enum type, constructors and initializers may not
3659 * reference its static members unless they are constant.
3660 *
3661 * @param tree The tree making up the variable reference.
3662 * @param env The current environment.
3663 * @param v The variable's symbol.
3664 * @jls section 8.9 Enums
3665 */
3666 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3667 // JLS:
3668 //
3669 // "It is a compile-time error to reference a static field
3670 // of an enum type that is not a compile-time constant
3671 // (15.28) from constructors, instance initializer blocks,
3672 // or instance variable initializer expressions of that
3673 // type. It is a compile-time error for the constructors,
3674 // instance initializer blocks, or instance variable
3675 // initializer expressions of an enum constant e to refer
3676 // to itself or to an enum constant of the same type that
3677 // is declared to the right of e."
3678 if (isStaticEnumField(v)) {
3679 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3681 if (enclClass == null || enclClass.owner == null)
3682 return;
3684 // See if the enclosing class is the enum (or a
3685 // subclass thereof) declaring v. If not, this
3686 // reference is OK.
3687 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3688 return;
3690 // If the reference isn't from an initializer, then
3691 // the reference is OK.
3692 if (!Resolve.isInitializer(env))
3693 return;
3695 log.error(tree.pos(), "illegal.enum.static.ref");
3696 }
3697 }
3699 /** Is the given symbol a static, non-constant field of an Enum?
3700 * Note: enum literals should not be regarded as such
3701 */
3702 private boolean isStaticEnumField(VarSymbol v) {
3703 return Flags.isEnum(v.owner) &&
3704 Flags.isStatic(v) &&
3705 !Flags.isConstant(v) &&
3706 v.name != names._class;
3707 }
3709 /** Can the given symbol be the owner of code which forms part
3710 * if class initialization? This is the case if the symbol is
3711 * a type or field, or if the symbol is the synthetic method.
3712 * owning a block.
3713 */
3714 private boolean canOwnInitializer(Symbol sym) {
3715 return
3716 (sym.kind & (VAR | TYP)) != 0 ||
3717 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3718 }
3720 Warner noteWarner = new Warner();
3722 /**
3723 * Check that method arguments conform to its instantiation.
3724 **/
3725 public Type checkMethod(Type site,
3726 final Symbol sym,
3727 ResultInfo resultInfo,
3728 Env<AttrContext> env,
3729 final List<JCExpression> argtrees,
3730 List<Type> argtypes,
3731 List<Type> typeargtypes) {
3732 // Test (5): if symbol is an instance method of a raw type, issue
3733 // an unchecked warning if its argument types change under erasure.
3734 if (allowGenerics &&
3735 (sym.flags() & STATIC) == 0 &&
3736 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3737 Type s = types.asOuterSuper(site, sym.owner);
3738 if (s != null && s.isRaw() &&
3739 !types.isSameTypes(sym.type.getParameterTypes(),
3740 sym.erasure(types).getParameterTypes())) {
3741 chk.warnUnchecked(env.tree.pos(),
3742 "unchecked.call.mbr.of.raw.type",
3743 sym, s);
3744 }
3745 }
3747 if (env.info.defaultSuperCallSite != null) {
3748 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3749 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3750 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3751 List<MethodSymbol> icand_sup =
3752 types.interfaceCandidates(sup, (MethodSymbol)sym);
3753 if (icand_sup.nonEmpty() &&
3754 icand_sup.head != sym &&
3755 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3756 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3757 diags.fragment("overridden.default", sym, sup));
3758 break;
3759 }
3760 }
3761 env.info.defaultSuperCallSite = null;
3762 }
3764 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3765 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3766 if (app.meth.hasTag(SELECT) &&
3767 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3768 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3769 }
3770 }
3772 // Compute the identifier's instantiated type.
3773 // For methods, we need to compute the instance type by
3774 // Resolve.instantiate from the symbol's type as well as
3775 // any type arguments and value arguments.
3776 noteWarner.clear();
3777 try {
3778 Type owntype = rs.checkMethod(
3779 env,
3780 site,
3781 sym,
3782 resultInfo,
3783 argtypes,
3784 typeargtypes,
3785 noteWarner);
3787 DeferredAttr.DeferredTypeMap checkDeferredMap =
3788 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3790 argtypes = Type.map(argtypes, checkDeferredMap);
3792 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3793 chk.warnUnchecked(env.tree.pos(),
3794 "unchecked.meth.invocation.applied",
3795 kindName(sym),
3796 sym.name,
3797 rs.methodArguments(sym.type.getParameterTypes()),
3798 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3799 kindName(sym.location()),
3800 sym.location());
3801 owntype = new MethodType(owntype.getParameterTypes(),
3802 types.erasure(owntype.getReturnType()),
3803 types.erasure(owntype.getThrownTypes()),
3804 syms.methodClass);
3805 }
3807 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3808 resultInfo.checkContext.inferenceContext());
3809 } catch (Infer.InferenceException ex) {
3810 //invalid target type - propagate exception outwards or report error
3811 //depending on the current check context
3812 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3813 return types.createErrorType(site);
3814 } catch (Resolve.InapplicableMethodException ex) {
3815 final JCDiagnostic diag = ex.getDiagnostic();
3816 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3817 @Override
3818 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3819 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3820 }
3821 };
3822 List<Type> argtypes2 = Type.map(argtypes,
3823 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3824 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3825 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3826 log.report(errDiag);
3827 return types.createErrorType(site);
3828 }
3829 }
3831 public void visitLiteral(JCLiteral tree) {
3832 result = check(
3833 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3834 }
3835 //where
3836 /** Return the type of a literal with given type tag.
3837 */
3838 Type litType(TypeTag tag) {
3839 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3840 }
3842 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3843 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3844 }
3846 public void visitTypeArray(JCArrayTypeTree tree) {
3847 Type etype = attribType(tree.elemtype, env);
3848 Type type = new ArrayType(etype, syms.arrayClass);
3849 result = check(tree, type, TYP, resultInfo);
3850 }
3852 /** Visitor method for parameterized types.
3853 * Bound checking is left until later, since types are attributed
3854 * before supertype structure is completely known
3855 */
3856 public void visitTypeApply(JCTypeApply tree) {
3857 Type owntype = types.createErrorType(tree.type);
3859 // Attribute functor part of application and make sure it's a class.
3860 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3862 // Attribute type parameters
3863 List<Type> actuals = attribTypes(tree.arguments, env);
3865 if (clazztype.hasTag(CLASS)) {
3866 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3867 if (actuals.isEmpty()) //diamond
3868 actuals = formals;
3870 if (actuals.length() == formals.length()) {
3871 List<Type> a = actuals;
3872 List<Type> f = formals;
3873 while (a.nonEmpty()) {
3874 a.head = a.head.withTypeVar(f.head);
3875 a = a.tail;
3876 f = f.tail;
3877 }
3878 // Compute the proper generic outer
3879 Type clazzOuter = clazztype.getEnclosingType();
3880 if (clazzOuter.hasTag(CLASS)) {
3881 Type site;
3882 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3883 if (clazz.hasTag(IDENT)) {
3884 site = env.enclClass.sym.type;
3885 } else if (clazz.hasTag(SELECT)) {
3886 site = ((JCFieldAccess) clazz).selected.type;
3887 } else throw new AssertionError(""+tree);
3888 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3889 if (site.hasTag(CLASS))
3890 site = types.asOuterSuper(site, clazzOuter.tsym);
3891 if (site == null)
3892 site = types.erasure(clazzOuter);
3893 clazzOuter = site;
3894 }
3895 }
3896 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3897 if (clazztype.isAnnotated()) {
3898 // Use the same AnnotatedType, because it will have
3899 // its annotations set later.
3900 ((AnnotatedType)clazztype).underlyingType = owntype;
3901 owntype = clazztype;
3902 }
3903 } else {
3904 if (formals.length() != 0) {
3905 log.error(tree.pos(), "wrong.number.type.args",
3906 Integer.toString(formals.length()));
3907 } else {
3908 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3909 }
3910 owntype = types.createErrorType(tree.type);
3911 }
3912 }
3913 result = check(tree, owntype, TYP, resultInfo);
3914 }
3916 public void visitTypeUnion(JCTypeUnion tree) {
3917 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3918 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3919 for (JCExpression typeTree : tree.alternatives) {
3920 Type ctype = attribType(typeTree, env);
3921 ctype = chk.checkType(typeTree.pos(),
3922 chk.checkClassType(typeTree.pos(), ctype),
3923 syms.throwableType);
3924 if (!ctype.isErroneous()) {
3925 //check that alternatives of a union type are pairwise
3926 //unrelated w.r.t. subtyping
3927 if (chk.intersects(ctype, multicatchTypes.toList())) {
3928 for (Type t : multicatchTypes) {
3929 boolean sub = types.isSubtype(ctype, t);
3930 boolean sup = types.isSubtype(t, ctype);
3931 if (sub || sup) {
3932 //assume 'a' <: 'b'
3933 Type a = sub ? ctype : t;
3934 Type b = sub ? t : ctype;
3935 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3936 }
3937 }
3938 }
3939 multicatchTypes.append(ctype);
3940 if (all_multicatchTypes != null)
3941 all_multicatchTypes.append(ctype);
3942 } else {
3943 if (all_multicatchTypes == null) {
3944 all_multicatchTypes = ListBuffer.lb();
3945 all_multicatchTypes.appendList(multicatchTypes);
3946 }
3947 all_multicatchTypes.append(ctype);
3948 }
3949 }
3950 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3951 if (t.hasTag(CLASS)) {
3952 List<Type> alternatives =
3953 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3954 t = new UnionClassType((ClassType) t, alternatives);
3955 }
3956 tree.type = result = t;
3957 }
3959 public void visitTypeIntersection(JCTypeIntersection tree) {
3960 attribTypes(tree.bounds, env);
3961 tree.type = result = checkIntersection(tree, tree.bounds);
3962 }
3964 public void visitTypeParameter(JCTypeParameter tree) {
3965 TypeVar typeVar = (TypeVar) tree.type;
3967 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3968 AnnotatedType antype = new AnnotatedType(typeVar);
3969 annotateType(antype, tree.annotations);
3970 tree.type = antype;
3971 }
3973 if (!typeVar.bound.isErroneous()) {
3974 //fixup type-parameter bound computed in 'attribTypeVariables'
3975 typeVar.bound = checkIntersection(tree, tree.bounds);
3976 }
3977 }
3979 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3980 Set<Type> boundSet = new HashSet<Type>();
3981 if (bounds.nonEmpty()) {
3982 // accept class or interface or typevar as first bound.
3983 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3984 boundSet.add(types.erasure(bounds.head.type));
3985 if (bounds.head.type.isErroneous()) {
3986 return bounds.head.type;
3987 }
3988 else if (bounds.head.type.hasTag(TYPEVAR)) {
3989 // if first bound was a typevar, do not accept further bounds.
3990 if (bounds.tail.nonEmpty()) {
3991 log.error(bounds.tail.head.pos(),
3992 "type.var.may.not.be.followed.by.other.bounds");
3993 return bounds.head.type;
3994 }
3995 } else {
3996 // if first bound was a class or interface, accept only interfaces
3997 // as further bounds.
3998 for (JCExpression bound : bounds.tail) {
3999 bound.type = checkBase(bound.type, bound, env, false, true, false);
4000 if (bound.type.isErroneous()) {
4001 bounds = List.of(bound);
4002 }
4003 else if (bound.type.hasTag(CLASS)) {
4004 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4005 }
4006 }
4007 }
4008 }
4010 if (bounds.length() == 0) {
4011 return syms.objectType;
4012 } else if (bounds.length() == 1) {
4013 return bounds.head.type;
4014 } else {
4015 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
4016 if (tree.hasTag(TYPEINTERSECTION)) {
4017 ((IntersectionClassType)owntype).intersectionKind =
4018 IntersectionClassType.IntersectionKind.EXPLICIT;
4019 }
4020 // ... the variable's bound is a class type flagged COMPOUND
4021 // (see comment for TypeVar.bound).
4022 // In this case, generate a class tree that represents the
4023 // bound class, ...
4024 JCExpression extending;
4025 List<JCExpression> implementing;
4026 if (!bounds.head.type.isInterface()) {
4027 extending = bounds.head;
4028 implementing = bounds.tail;
4029 } else {
4030 extending = null;
4031 implementing = bounds;
4032 }
4033 JCClassDecl cd = make.at(tree).ClassDef(
4034 make.Modifiers(PUBLIC | ABSTRACT),
4035 names.empty, List.<JCTypeParameter>nil(),
4036 extending, implementing, List.<JCTree>nil());
4038 ClassSymbol c = (ClassSymbol)owntype.tsym;
4039 Assert.check((c.flags() & COMPOUND) != 0);
4040 cd.sym = c;
4041 c.sourcefile = env.toplevel.sourcefile;
4043 // ... and attribute the bound class
4044 c.flags_field |= UNATTRIBUTED;
4045 Env<AttrContext> cenv = enter.classEnv(cd, env);
4046 enter.typeEnvs.put(c, cenv);
4047 attribClass(c);
4048 return owntype;
4049 }
4050 }
4052 public void visitWildcard(JCWildcard tree) {
4053 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4054 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4055 ? syms.objectType
4056 : attribType(tree.inner, env);
4057 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4058 tree.kind.kind,
4059 syms.boundClass),
4060 TYP, resultInfo);
4061 }
4063 public void visitAnnotation(JCAnnotation tree) {
4064 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
4065 result = tree.type = syms.errType;
4066 }
4068 public void visitAnnotatedType(JCAnnotatedType tree) {
4069 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4070 this.attribAnnotationTypes(tree.annotations, env);
4071 AnnotatedType antype = new AnnotatedType(underlyingType);
4072 annotateType(antype, tree.annotations);
4073 result = tree.type = antype;
4074 }
4076 /**
4077 * Apply the annotations to the particular type.
4078 */
4079 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
4080 if (annotations.isEmpty())
4081 return;
4082 annotate.typeAnnotation(new Annotate.Annotator() {
4083 @Override
4084 public String toString() {
4085 return "annotate " + annotations + " onto " + type;
4086 }
4087 @Override
4088 public void enterAnnotation() {
4089 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4090 type.typeAnnotations = compounds;
4091 }
4092 });
4093 }
4095 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4096 if (annotations.isEmpty())
4097 return List.nil();
4099 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
4100 for (JCAnnotation anno : annotations) {
4101 if (anno.attribute != null) {
4102 // TODO: this null-check is only needed for an obscure
4103 // ordering issue, where annotate.flush is called when
4104 // the attribute is not set yet. For an example failure
4105 // try the referenceinfos/NestedTypes.java test.
4106 // Any better solutions?
4107 buf.append((Attribute.TypeCompound) anno.attribute);
4108 }
4109 }
4110 return buf.toList();
4111 }
4113 public void visitErroneous(JCErroneous tree) {
4114 if (tree.errs != null)
4115 for (JCTree err : tree.errs)
4116 attribTree(err, env, new ResultInfo(ERR, pt()));
4117 result = tree.type = syms.errType;
4118 }
4120 /** Default visitor method for all other trees.
4121 */
4122 public void visitTree(JCTree tree) {
4123 throw new AssertionError();
4124 }
4126 /**
4127 * Attribute an env for either a top level tree or class declaration.
4128 */
4129 public void attrib(Env<AttrContext> env) {
4130 if (env.tree.hasTag(TOPLEVEL))
4131 attribTopLevel(env);
4132 else
4133 attribClass(env.tree.pos(), env.enclClass.sym);
4134 }
4136 /**
4137 * Attribute a top level tree. These trees are encountered when the
4138 * package declaration has annotations.
4139 */
4140 public void attribTopLevel(Env<AttrContext> env) {
4141 JCCompilationUnit toplevel = env.toplevel;
4142 try {
4143 annotate.flush();
4144 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
4145 } catch (CompletionFailure ex) {
4146 chk.completionError(toplevel.pos(), ex);
4147 }
4148 }
4150 /** Main method: attribute class definition associated with given class symbol.
4151 * reporting completion failures at the given position.
4152 * @param pos The source position at which completion errors are to be
4153 * reported.
4154 * @param c The class symbol whose definition will be attributed.
4155 */
4156 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4157 try {
4158 annotate.flush();
4159 attribClass(c);
4160 } catch (CompletionFailure ex) {
4161 chk.completionError(pos, ex);
4162 }
4163 }
4165 /** Attribute class definition associated with given class symbol.
4166 * @param c The class symbol whose definition will be attributed.
4167 */
4168 void attribClass(ClassSymbol c) throws CompletionFailure {
4169 if (c.type.hasTag(ERROR)) return;
4171 // Check for cycles in the inheritance graph, which can arise from
4172 // ill-formed class files.
4173 chk.checkNonCyclic(null, c.type);
4175 Type st = types.supertype(c.type);
4176 if ((c.flags_field & Flags.COMPOUND) == 0) {
4177 // First, attribute superclass.
4178 if (st.hasTag(CLASS))
4179 attribClass((ClassSymbol)st.tsym);
4181 // Next attribute owner, if it is a class.
4182 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4183 attribClass((ClassSymbol)c.owner);
4184 }
4186 // The previous operations might have attributed the current class
4187 // if there was a cycle. So we test first whether the class is still
4188 // UNATTRIBUTED.
4189 if ((c.flags_field & UNATTRIBUTED) != 0) {
4190 c.flags_field &= ~UNATTRIBUTED;
4192 // Get environment current at the point of class definition.
4193 Env<AttrContext> env = enter.typeEnvs.get(c);
4195 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4196 // because the annotations were not available at the time the env was created. Therefore,
4197 // we look up the environment chain for the first enclosing environment for which the
4198 // lint value is set. Typically, this is the parent env, but might be further if there
4199 // are any envs created as a result of TypeParameter nodes.
4200 Env<AttrContext> lintEnv = env;
4201 while (lintEnv.info.lint == null)
4202 lintEnv = lintEnv.next;
4204 // Having found the enclosing lint value, we can initialize the lint value for this class
4205 env.info.lint = lintEnv.info.lint.augment(c);
4207 Lint prevLint = chk.setLint(env.info.lint);
4208 JavaFileObject prev = log.useSource(c.sourcefile);
4209 ResultInfo prevReturnRes = env.info.returnResult;
4211 try {
4212 env.info.returnResult = null;
4213 // java.lang.Enum may not be subclassed by a non-enum
4214 if (st.tsym == syms.enumSym &&
4215 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4216 log.error(env.tree.pos(), "enum.no.subclassing");
4218 // Enums may not be extended by source-level classes
4219 if (st.tsym != null &&
4220 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4221 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4222 log.error(env.tree.pos(), "enum.types.not.extensible");
4223 }
4224 attribClassBody(env, c);
4226 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4227 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4228 } finally {
4229 env.info.returnResult = prevReturnRes;
4230 log.useSource(prev);
4231 chk.setLint(prevLint);
4232 }
4234 }
4235 }
4237 public void visitImport(JCImport tree) {
4238 // nothing to do
4239 }
4241 /** Finish the attribution of a class. */
4242 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4243 JCClassDecl tree = (JCClassDecl)env.tree;
4244 Assert.check(c == tree.sym);
4246 // Validate annotations
4247 chk.validateAnnotations(tree.mods.annotations, c);
4249 // Validate type parameters, supertype and interfaces.
4250 attribStats(tree.typarams, env);
4251 if (!c.isAnonymous()) {
4252 //already checked if anonymous
4253 chk.validate(tree.typarams, env);
4254 chk.validate(tree.extending, env);
4255 chk.validate(tree.implementing, env);
4256 }
4258 // If this is a non-abstract class, check that it has no abstract
4259 // methods or unimplemented methods of an implemented interface.
4260 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4261 if (!relax)
4262 chk.checkAllDefined(tree.pos(), c);
4263 }
4265 if ((c.flags() & ANNOTATION) != 0) {
4266 if (tree.implementing.nonEmpty())
4267 log.error(tree.implementing.head.pos(),
4268 "cant.extend.intf.annotation");
4269 if (tree.typarams.nonEmpty())
4270 log.error(tree.typarams.head.pos(),
4271 "intf.annotation.cant.have.type.params");
4273 // If this annotation has a @Repeatable, validate
4274 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4275 if (repeatable != null) {
4276 // get diagnostic position for error reporting
4277 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4278 Assert.checkNonNull(cbPos);
4280 chk.validateRepeatable(c, repeatable, cbPos);
4281 }
4282 } else {
4283 // Check that all extended classes and interfaces
4284 // are compatible (i.e. no two define methods with same arguments
4285 // yet different return types). (JLS 8.4.6.3)
4286 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4287 if (allowDefaultMethods) {
4288 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4289 }
4290 }
4292 // Check that class does not import the same parameterized interface
4293 // with two different argument lists.
4294 chk.checkClassBounds(tree.pos(), c.type);
4296 tree.type = c.type;
4298 for (List<JCTypeParameter> l = tree.typarams;
4299 l.nonEmpty(); l = l.tail) {
4300 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4301 }
4303 // Check that a generic class doesn't extend Throwable
4304 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4305 log.error(tree.extending.pos(), "generic.throwable");
4307 // Check that all methods which implement some
4308 // method conform to the method they implement.
4309 chk.checkImplementations(tree);
4311 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4312 checkAutoCloseable(tree.pos(), env, c.type);
4314 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4315 // Attribute declaration
4316 attribStat(l.head, env);
4317 // Check that declarations in inner classes are not static (JLS 8.1.2)
4318 // Make an exception for static constants.
4319 if (c.owner.kind != PCK &&
4320 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4321 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4322 Symbol sym = null;
4323 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4324 if (sym == null ||
4325 sym.kind != VAR ||
4326 ((VarSymbol) sym).getConstValue() == null)
4327 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4328 }
4329 }
4331 // Check for cycles among non-initial constructors.
4332 chk.checkCyclicConstructors(tree);
4334 // Check for cycles among annotation elements.
4335 chk.checkNonCyclicElements(tree);
4337 // Check for proper use of serialVersionUID
4338 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4339 isSerializable(c) &&
4340 (c.flags() & Flags.ENUM) == 0 &&
4341 checkForSerial(c)) {
4342 checkSerialVersionUID(tree, c);
4343 }
4344 if (allowTypeAnnos) {
4345 // Correctly organize the postions of the type annotations
4346 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4348 // Check type annotations applicability rules
4349 validateTypeAnnotations(tree);
4350 }
4351 }
4352 // where
4353 boolean checkForSerial(ClassSymbol c) {
4354 if ((c.flags() & ABSTRACT) == 0) {
4355 return true;
4356 } else {
4357 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4358 }
4359 }
4361 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4362 @Override
4363 public boolean accepts(Symbol s) {
4364 return s.kind == Kinds.MTH &&
4365 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4366 }
4367 };
4369 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4370 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4371 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4372 if (types.isSameType(al.head.annotationType.type, t))
4373 return al.head.pos();
4374 }
4376 return null;
4377 }
4379 /** check if a class is a subtype of Serializable, if that is available. */
4380 private boolean isSerializable(ClassSymbol c) {
4381 try {
4382 syms.serializableType.complete();
4383 }
4384 catch (CompletionFailure e) {
4385 return false;
4386 }
4387 return types.isSubtype(c.type, syms.serializableType);
4388 }
4390 /** Check that an appropriate serialVersionUID member is defined. */
4391 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4393 // check for presence of serialVersionUID
4394 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4395 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4396 if (e.scope == null) {
4397 log.warning(LintCategory.SERIAL,
4398 tree.pos(), "missing.SVUID", c);
4399 return;
4400 }
4402 // check that it is static final
4403 VarSymbol svuid = (VarSymbol)e.sym;
4404 if ((svuid.flags() & (STATIC | FINAL)) !=
4405 (STATIC | FINAL))
4406 log.warning(LintCategory.SERIAL,
4407 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4409 // check that it is long
4410 else if (!svuid.type.hasTag(LONG))
4411 log.warning(LintCategory.SERIAL,
4412 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4414 // check constant
4415 else if (svuid.getConstValue() == null)
4416 log.warning(LintCategory.SERIAL,
4417 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4418 }
4420 private Type capture(Type type) {
4421 return types.capture(type);
4422 }
4424 private void validateTypeAnnotations(JCTree tree) {
4425 tree.accept(typeAnnotationsValidator);
4426 }
4427 //where
4428 private final JCTree.Visitor typeAnnotationsValidator = new TreeScanner() {
4430 private boolean checkAllAnnotations = false;
4432 public void visitAnnotation(JCAnnotation tree) {
4433 if (tree.hasTag(TYPE_ANNOTATION) || checkAllAnnotations) {
4434 chk.validateTypeAnnotation(tree, false);
4435 }
4436 super.visitAnnotation(tree);
4437 }
4438 public void visitTypeParameter(JCTypeParameter tree) {
4439 chk.validateTypeAnnotations(tree.annotations, true);
4440 scan(tree.bounds);
4441 // Don't call super.
4442 // This is needed because above we call validateTypeAnnotation with
4443 // false, which would forbid annotations on type parameters.
4444 // super.visitTypeParameter(tree);
4445 }
4446 public void visitMethodDef(JCMethodDecl tree) {
4447 if (tree.recvparam != null &&
4448 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4449 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4450 tree.recvparam.vartype.type.tsym);
4451 }
4452 if (tree.restype != null && tree.restype.type != null) {
4453 validateAnnotatedType(tree.restype, tree.restype.type);
4454 }
4455 super.visitMethodDef(tree);
4456 }
4457 public void visitVarDef(final JCVariableDecl tree) {
4458 if (tree.sym != null && tree.sym.type != null)
4459 validateAnnotatedType(tree, tree.sym.type);
4460 super.visitVarDef(tree);
4461 }
4462 public void visitTypeCast(JCTypeCast tree) {
4463 if (tree.clazz != null && tree.clazz.type != null)
4464 validateAnnotatedType(tree.clazz, tree.clazz.type);
4465 super.visitTypeCast(tree);
4466 }
4467 public void visitTypeTest(JCInstanceOf tree) {
4468 if (tree.clazz != null && tree.clazz.type != null)
4469 validateAnnotatedType(tree.clazz, tree.clazz.type);
4470 super.visitTypeTest(tree);
4471 }
4472 public void visitNewClass(JCNewClass tree) {
4473 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4474 boolean prevCheck = this.checkAllAnnotations;
4475 try {
4476 this.checkAllAnnotations = true;
4477 scan(((JCAnnotatedType)tree.clazz).annotations);
4478 } finally {
4479 this.checkAllAnnotations = prevCheck;
4480 }
4481 }
4482 super.visitNewClass(tree);
4483 }
4484 public void visitNewArray(JCNewArray tree) {
4485 if (tree.elemtype != null && tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4486 boolean prevCheck = this.checkAllAnnotations;
4487 try {
4488 this.checkAllAnnotations = true;
4489 scan(((JCAnnotatedType)tree.elemtype).annotations);
4490 } finally {
4491 this.checkAllAnnotations = prevCheck;
4492 }
4493 }
4494 super.visitNewArray(tree);
4495 }
4497 /* I would want to model this after
4498 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4499 * and override visitSelect and visitTypeApply.
4500 * However, we only set the annotated type in the top-level type
4501 * of the symbol.
4502 * Therefore, we need to override each individual location where a type
4503 * can occur.
4504 */
4505 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4506 if (type.getEnclosingType() != null &&
4507 type != type.getEnclosingType()) {
4508 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4509 }
4510 for (Type targ : type.getTypeArguments()) {
4511 validateAnnotatedType(errtree, targ);
4512 }
4513 }
4514 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4515 validateAnnotatedType(errtree, type);
4516 if (type.tsym != null &&
4517 type.tsym.isStatic() &&
4518 type.getAnnotationMirrors().nonEmpty()) {
4519 // Enclosing static classes cannot have type annotations.
4520 log.error(errtree.pos(), "cant.annotate.static.class");
4521 }
4522 }
4523 };
4525 // <editor-fold desc="post-attribution visitor">
4527 /**
4528 * Handle missing types/symbols in an AST. This routine is useful when
4529 * the compiler has encountered some errors (which might have ended up
4530 * terminating attribution abruptly); if the compiler is used in fail-over
4531 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4532 * prevents NPE to be progagated during subsequent compilation steps.
4533 */
4534 public void postAttr(JCTree tree) {
4535 new PostAttrAnalyzer().scan(tree);
4536 }
4538 class PostAttrAnalyzer extends TreeScanner {
4540 private void initTypeIfNeeded(JCTree that) {
4541 if (that.type == null) {
4542 that.type = syms.unknownType;
4543 }
4544 }
4546 @Override
4547 public void scan(JCTree tree) {
4548 if (tree == null) return;
4549 if (tree instanceof JCExpression) {
4550 initTypeIfNeeded(tree);
4551 }
4552 super.scan(tree);
4553 }
4555 @Override
4556 public void visitIdent(JCIdent that) {
4557 if (that.sym == null) {
4558 that.sym = syms.unknownSymbol;
4559 }
4560 }
4562 @Override
4563 public void visitSelect(JCFieldAccess that) {
4564 if (that.sym == null) {
4565 that.sym = syms.unknownSymbol;
4566 }
4567 super.visitSelect(that);
4568 }
4570 @Override
4571 public void visitClassDef(JCClassDecl that) {
4572 initTypeIfNeeded(that);
4573 if (that.sym == null) {
4574 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4575 }
4576 super.visitClassDef(that);
4577 }
4579 @Override
4580 public void visitMethodDef(JCMethodDecl that) {
4581 initTypeIfNeeded(that);
4582 if (that.sym == null) {
4583 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4584 }
4585 super.visitMethodDef(that);
4586 }
4588 @Override
4589 public void visitVarDef(JCVariableDecl that) {
4590 initTypeIfNeeded(that);
4591 if (that.sym == null) {
4592 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4593 that.sym.adr = 0;
4594 }
4595 super.visitVarDef(that);
4596 }
4598 @Override
4599 public void visitNewClass(JCNewClass that) {
4600 if (that.constructor == null) {
4601 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4602 }
4603 if (that.constructorType == null) {
4604 that.constructorType = syms.unknownType;
4605 }
4606 super.visitNewClass(that);
4607 }
4609 @Override
4610 public void visitAssignop(JCAssignOp that) {
4611 if (that.operator == null)
4612 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4613 super.visitAssignop(that);
4614 }
4616 @Override
4617 public void visitBinary(JCBinary that) {
4618 if (that.operator == null)
4619 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4620 super.visitBinary(that);
4621 }
4623 @Override
4624 public void visitUnary(JCUnary that) {
4625 if (that.operator == null)
4626 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4627 super.visitUnary(that);
4628 }
4630 @Override
4631 public void visitLambda(JCLambda that) {
4632 super.visitLambda(that);
4633 if (that.targets == null) {
4634 that.targets = List.nil();
4635 }
4636 }
4638 @Override
4639 public void visitReference(JCMemberReference that) {
4640 super.visitReference(that);
4641 if (that.sym == null) {
4642 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4643 }
4644 if (that.targets == null) {
4645 that.targets = List.nil();
4646 }
4647 }
4648 }
4649 // </editor-fold>
4650 }