Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@4788eb38cac5
src/share/classes/com/sun/tools/javac/comp/Attr.java
Mon, 11 Nov 2013 09:47:46 -0500
- author
- emc
- date
- Mon, 11 Nov 2013 09:47:46 -0500
- changeset 2187
- 4788eb38cac5
- parent 2179
- 8b4e1421a9b7
- child 2191
- e79d6425f1c4
- permissions
- -rw-r--r--
8027439: Compile-time error in the case of ((Integer[] & Serializable)new Integer[1]).getClass()
8027253: javac illegally accepts array as bound
Summary: backing out change allowing arrays in intersection types
Reviewed-by: vromero
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 TypeAnnotations typeAnnotations;
97 final DeferredLintHandler deferredLintHandler;
99 public static Attr instance(Context context) {
100 Attr instance = context.get(attrKey);
101 if (instance == null)
102 instance = new Attr(context);
103 return instance;
104 }
106 protected Attr(Context context) {
107 context.put(attrKey, this);
109 names = Names.instance(context);
110 log = Log.instance(context);
111 syms = Symtab.instance(context);
112 rs = Resolve.instance(context);
113 chk = Check.instance(context);
114 flow = Flow.instance(context);
115 memberEnter = MemberEnter.instance(context);
116 make = TreeMaker.instance(context);
117 enter = Enter.instance(context);
118 infer = Infer.instance(context);
119 deferredAttr = DeferredAttr.instance(context);
120 cfolder = ConstFold.instance(context);
121 target = Target.instance(context);
122 types = Types.instance(context);
123 diags = JCDiagnostic.Factory.instance(context);
124 annotate = Annotate.instance(context);
125 typeAnnotations = TypeAnnotations.instance(context);
126 deferredLintHandler = DeferredLintHandler.instance(context);
128 Options options = Options.instance(context);
130 Source source = Source.instance(context);
131 allowGenerics = source.allowGenerics();
132 allowVarargs = source.allowVarargs();
133 allowEnums = source.allowEnums();
134 allowBoxing = source.allowBoxing();
135 allowCovariantReturns = source.allowCovariantReturns();
136 allowAnonOuterThis = source.allowAnonOuterThis();
137 allowStringsInSwitch = source.allowStringsInSwitch();
138 allowPoly = source.allowPoly();
139 allowTypeAnnos = source.allowTypeAnnotations();
140 allowLambda = source.allowLambda();
141 allowDefaultMethods = source.allowDefaultMethods();
142 sourceName = source.name;
143 relax = (options.isSet("-retrofit") ||
144 options.isSet("-relax"));
145 findDiamonds = options.get("findDiamond") != null &&
146 source.allowDiamond();
147 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
148 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
150 statInfo = new ResultInfo(NIL, Type.noType);
151 varInfo = new ResultInfo(VAR, Type.noType);
152 unknownExprInfo = new ResultInfo(VAL, Type.noType);
153 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
154 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
155 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
156 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
157 }
159 /** Switch: relax some constraints for retrofit mode.
160 */
161 boolean relax;
163 /** Switch: support target-typing inference
164 */
165 boolean allowPoly;
167 /** Switch: support type annotations.
168 */
169 boolean allowTypeAnnos;
171 /** Switch: support generics?
172 */
173 boolean allowGenerics;
175 /** Switch: allow variable-arity methods.
176 */
177 boolean allowVarargs;
179 /** Switch: support enums?
180 */
181 boolean allowEnums;
183 /** Switch: support boxing and unboxing?
184 */
185 boolean allowBoxing;
187 /** Switch: support covariant result types?
188 */
189 boolean allowCovariantReturns;
191 /** Switch: support lambda expressions ?
192 */
193 boolean allowLambda;
195 /** Switch: support default methods ?
196 */
197 boolean allowDefaultMethods;
199 /** Switch: allow references to surrounding object from anonymous
200 * objects during constructor call?
201 */
202 boolean allowAnonOuterThis;
204 /** Switch: generates a warning if diamond can be safely applied
205 * to a given new expression
206 */
207 boolean findDiamonds;
209 /**
210 * Internally enables/disables diamond finder feature
211 */
212 static final boolean allowDiamondFinder = true;
214 /**
215 * Switch: warn about use of variable before declaration?
216 * RFE: 6425594
217 */
218 boolean useBeforeDeclarationWarning;
220 /**
221 * Switch: generate warnings whenever an anonymous inner class that is convertible
222 * to a lambda expression is found
223 */
224 boolean identifyLambdaCandidate;
226 /**
227 * Switch: allow strings in switch?
228 */
229 boolean allowStringsInSwitch;
231 /**
232 * Switch: name of source level; used for error reporting.
233 */
234 String sourceName;
236 /** Check kind and type of given tree against protokind and prototype.
237 * If check succeeds, store type in tree and return it.
238 * If check fails, store errType in tree and return it.
239 * No checks are performed if the prototype is a method type.
240 * It is not necessary in this case since we know that kind and type
241 * are correct.
242 *
243 * @param tree The tree whose kind and type is checked
244 * @param ownkind The computed kind of the tree
245 * @param resultInfo The expected result of the tree
246 */
247 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
248 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
249 Type owntype = found;
250 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
251 if (allowPoly && inferenceContext.free(found)) {
252 if ((ownkind & ~resultInfo.pkind) == 0) {
253 owntype = resultInfo.check(tree, inferenceContext.asFree(owntype));
254 } else {
255 log.error(tree.pos(), "unexpected.type",
256 kindNames(resultInfo.pkind),
257 kindName(ownkind));
258 owntype = types.createErrorType(owntype);
259 }
260 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
261 @Override
262 public void typesInferred(InferenceContext inferenceContext) {
263 ResultInfo pendingResult =
264 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
265 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
266 }
267 });
268 return tree.type = resultInfo.pt;
269 } else {
270 if ((ownkind & ~resultInfo.pkind) == 0) {
271 owntype = resultInfo.check(tree, owntype);
272 } else {
273 log.error(tree.pos(), "unexpected.type",
274 kindNames(resultInfo.pkind),
275 kindName(ownkind));
276 owntype = types.createErrorType(owntype);
277 }
278 }
279 }
280 tree.type = owntype;
281 return owntype;
282 }
284 /** Is given blank final variable assignable, i.e. in a scope where it
285 * may be assigned to even though it is final?
286 * @param v The blank final variable.
287 * @param env The current environment.
288 */
289 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
290 Symbol owner = owner(env);
291 // owner refers to the innermost variable, method or
292 // initializer block declaration at this point.
293 return
294 v.owner == owner
295 ||
296 ((owner.name == names.init || // i.e. we are in a constructor
297 owner.kind == VAR || // i.e. we are in a variable initializer
298 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
299 &&
300 v.owner == owner.owner
301 &&
302 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
303 }
305 /**
306 * Return the innermost enclosing owner symbol in a given attribution context
307 */
308 Symbol owner(Env<AttrContext> env) {
309 while (true) {
310 switch (env.tree.getTag()) {
311 case VARDEF:
312 //a field can be owner
313 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
314 if (vsym.owner.kind == TYP) {
315 return vsym;
316 }
317 break;
318 case METHODDEF:
319 //method def is always an owner
320 return ((JCMethodDecl)env.tree).sym;
321 case CLASSDEF:
322 //class def is always an owner
323 return ((JCClassDecl)env.tree).sym;
324 case BLOCK:
325 //static/instance init blocks are owner
326 Symbol blockSym = env.info.scope.owner;
327 if ((blockSym.flags() & BLOCK) != 0) {
328 return blockSym;
329 }
330 break;
331 case TOPLEVEL:
332 //toplevel is always an owner (for pkge decls)
333 return env.info.scope.owner;
334 }
335 Assert.checkNonNull(env.next);
336 env = env.next;
337 }
338 }
340 /** Check that variable can be assigned to.
341 * @param pos The current source code position.
342 * @param v The assigned varaible
343 * @param base If the variable is referred to in a Select, the part
344 * to the left of the `.', null otherwise.
345 * @param env The current environment.
346 */
347 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
348 if ((v.flags() & FINAL) != 0 &&
349 ((v.flags() & HASINIT) != 0
350 ||
351 !((base == null ||
352 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
353 isAssignableAsBlankFinal(v, env)))) {
354 if (v.isResourceVariable()) { //TWR resource
355 log.error(pos, "try.resource.may.not.be.assigned", v);
356 } else {
357 log.error(pos, "cant.assign.val.to.final.var", v);
358 }
359 }
360 }
362 /** Does tree represent a static reference to an identifier?
363 * It is assumed that tree is either a SELECT or an IDENT.
364 * We have to weed out selects from non-type names here.
365 * @param tree The candidate tree.
366 */
367 boolean isStaticReference(JCTree tree) {
368 if (tree.hasTag(SELECT)) {
369 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
370 if (lsym == null || lsym.kind != TYP) {
371 return false;
372 }
373 }
374 return true;
375 }
377 /** Is this symbol a type?
378 */
379 static boolean isType(Symbol sym) {
380 return sym != null && sym.kind == TYP;
381 }
383 /** The current `this' symbol.
384 * @param env The current environment.
385 */
386 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
387 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
388 }
390 /** Attribute a parsed identifier.
391 * @param tree Parsed identifier name
392 * @param topLevel The toplevel to use
393 */
394 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
395 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
396 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
397 syms.errSymbol.name,
398 null, null, null, null);
399 localEnv.enclClass.sym = syms.errSymbol;
400 return tree.accept(identAttributer, localEnv);
401 }
402 // where
403 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
404 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
405 @Override
406 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
407 Symbol site = visit(node.getExpression(), env);
408 if (site.kind == ERR || site.kind == ABSENT_TYP)
409 return site;
410 Name name = (Name)node.getIdentifier();
411 if (site.kind == PCK) {
412 env.toplevel.packge = (PackageSymbol)site;
413 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
414 } else {
415 env.enclClass.sym = (ClassSymbol)site;
416 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
417 }
418 }
420 @Override
421 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
422 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
423 }
424 }
426 public Type coerce(Type etype, Type ttype) {
427 return cfolder.coerce(etype, ttype);
428 }
430 public Type attribType(JCTree node, TypeSymbol sym) {
431 Env<AttrContext> env = enter.typeEnvs.get(sym);
432 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
433 return attribTree(node, localEnv, unknownTypeInfo);
434 }
436 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
437 // Attribute qualifying package or class.
438 JCFieldAccess s = (JCFieldAccess)tree.qualid;
439 return attribTree(s.selected,
440 env,
441 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
442 Type.noType));
443 }
445 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
446 breakTree = tree;
447 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
448 try {
449 attribExpr(expr, env);
450 } catch (BreakAttr b) {
451 return b.env;
452 } catch (AssertionError ae) {
453 if (ae.getCause() instanceof BreakAttr) {
454 return ((BreakAttr)(ae.getCause())).env;
455 } else {
456 throw ae;
457 }
458 } finally {
459 breakTree = null;
460 log.useSource(prev);
461 }
462 return env;
463 }
465 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
466 breakTree = tree;
467 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
468 try {
469 attribStat(stmt, env);
470 } catch (BreakAttr b) {
471 return b.env;
472 } catch (AssertionError ae) {
473 if (ae.getCause() instanceof BreakAttr) {
474 return ((BreakAttr)(ae.getCause())).env;
475 } else {
476 throw ae;
477 }
478 } finally {
479 breakTree = null;
480 log.useSource(prev);
481 }
482 return env;
483 }
485 private JCTree breakTree = null;
487 private static class BreakAttr extends RuntimeException {
488 static final long serialVersionUID = -6924771130405446405L;
489 private Env<AttrContext> env;
490 private BreakAttr(Env<AttrContext> env) {
491 this.env = env;
492 }
493 }
495 class ResultInfo {
496 final int pkind;
497 final Type pt;
498 final CheckContext checkContext;
500 ResultInfo(int pkind, Type pt) {
501 this(pkind, pt, chk.basicHandler);
502 }
504 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
505 this.pkind = pkind;
506 this.pt = pt;
507 this.checkContext = checkContext;
508 }
510 protected Type check(final DiagnosticPosition pos, final Type found) {
511 return chk.checkType(pos, found, pt, checkContext);
512 }
514 protected ResultInfo dup(Type newPt) {
515 return new ResultInfo(pkind, newPt, checkContext);
516 }
518 protected ResultInfo dup(CheckContext newContext) {
519 return new ResultInfo(pkind, pt, newContext);
520 }
522 @Override
523 public String toString() {
524 if (pt != null) {
525 return pt.toString();
526 } else {
527 return "";
528 }
529 }
530 }
532 class RecoveryInfo extends ResultInfo {
534 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
535 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
536 @Override
537 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
538 return deferredAttrContext;
539 }
540 @Override
541 public boolean compatible(Type found, Type req, Warner warn) {
542 return true;
543 }
544 @Override
545 public void report(DiagnosticPosition pos, JCDiagnostic details) {
546 chk.basicHandler.report(pos, details);
547 }
548 });
549 }
550 }
552 final ResultInfo statInfo;
553 final ResultInfo varInfo;
554 final ResultInfo unknownAnyPolyInfo;
555 final ResultInfo unknownExprInfo;
556 final ResultInfo unknownTypeInfo;
557 final ResultInfo unknownTypeExprInfo;
558 final ResultInfo recoveryInfo;
560 Type pt() {
561 return resultInfo.pt;
562 }
564 int pkind() {
565 return resultInfo.pkind;
566 }
568 /* ************************************************************************
569 * Visitor methods
570 *************************************************************************/
572 /** Visitor argument: the current environment.
573 */
574 Env<AttrContext> env;
576 /** Visitor argument: the currently expected attribution result.
577 */
578 ResultInfo resultInfo;
580 /** Visitor result: the computed type.
581 */
582 Type result;
584 /** Visitor method: attribute a tree, catching any completion failure
585 * exceptions. Return the tree's type.
586 *
587 * @param tree The tree to be visited.
588 * @param env The environment visitor argument.
589 * @param resultInfo The result info visitor argument.
590 */
591 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
592 Env<AttrContext> prevEnv = this.env;
593 ResultInfo prevResult = this.resultInfo;
594 try {
595 this.env = env;
596 this.resultInfo = resultInfo;
597 tree.accept(this);
598 if (tree == breakTree &&
599 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
600 throw new BreakAttr(copyEnv(env));
601 }
602 return result;
603 } catch (CompletionFailure ex) {
604 tree.type = syms.errType;
605 return chk.completionError(tree.pos(), ex);
606 } finally {
607 this.env = prevEnv;
608 this.resultInfo = prevResult;
609 }
610 }
612 Env<AttrContext> copyEnv(Env<AttrContext> env) {
613 Env<AttrContext> newEnv =
614 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
615 if (newEnv.outer != null) {
616 newEnv.outer = copyEnv(newEnv.outer);
617 }
618 return newEnv;
619 }
621 Scope copyScope(Scope sc) {
622 Scope newScope = new Scope(sc.owner);
623 List<Symbol> elemsList = List.nil();
624 while (sc != null) {
625 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
626 elemsList = elemsList.prepend(e.sym);
627 }
628 sc = sc.next;
629 }
630 for (Symbol s : elemsList) {
631 newScope.enter(s);
632 }
633 return newScope;
634 }
636 /** Derived visitor method: attribute an expression tree.
637 */
638 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
639 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
640 }
642 /** Derived visitor method: attribute an expression tree with
643 * no constraints on the computed type.
644 */
645 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
646 return attribTree(tree, env, unknownExprInfo);
647 }
649 /** Derived visitor method: attribute a type tree.
650 */
651 public Type attribType(JCTree tree, Env<AttrContext> env) {
652 Type result = attribType(tree, env, Type.noType);
653 return result;
654 }
656 /** Derived visitor method: attribute a type tree.
657 */
658 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
659 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
660 return result;
661 }
663 /** Derived visitor method: attribute a statement or definition tree.
664 */
665 public Type attribStat(JCTree tree, Env<AttrContext> env) {
666 return attribTree(tree, env, statInfo);
667 }
669 /** Attribute a list of expressions, returning a list of types.
670 */
671 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
672 ListBuffer<Type> ts = new ListBuffer<Type>();
673 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
674 ts.append(attribExpr(l.head, env, pt));
675 return ts.toList();
676 }
678 /** Attribute a list of statements, returning nothing.
679 */
680 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
681 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
682 attribStat(l.head, env);
683 }
685 /** Attribute the arguments in a method call, returning the method kind.
686 */
687 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
688 int kind = VAL;
689 for (JCExpression arg : trees) {
690 Type argtype;
691 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
692 argtype = deferredAttr.new DeferredType(arg, env);
693 kind |= POLY;
694 } else {
695 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
696 }
697 argtypes.append(argtype);
698 }
699 return kind;
700 }
702 /** Attribute a type argument list, returning a list of types.
703 * Caller is responsible for calling checkRefTypes.
704 */
705 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
706 ListBuffer<Type> argtypes = new ListBuffer<Type>();
707 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
708 argtypes.append(attribType(l.head, env));
709 return argtypes.toList();
710 }
712 /** Attribute a type argument list, returning a list of types.
713 * Check that all the types are references.
714 */
715 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
716 List<Type> types = attribAnyTypes(trees, env);
717 return chk.checkRefTypes(trees, types);
718 }
720 /**
721 * Attribute type variables (of generic classes or methods).
722 * Compound types are attributed later in attribBounds.
723 * @param typarams the type variables to enter
724 * @param env the current environment
725 */
726 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
727 for (JCTypeParameter tvar : typarams) {
728 TypeVar a = (TypeVar)tvar.type;
729 a.tsym.flags_field |= UNATTRIBUTED;
730 a.bound = Type.noType;
731 if (!tvar.bounds.isEmpty()) {
732 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
733 for (JCExpression bound : tvar.bounds.tail)
734 bounds = bounds.prepend(attribType(bound, env));
735 types.setBounds(a, bounds.reverse());
736 } else {
737 // if no bounds are given, assume a single bound of
738 // java.lang.Object.
739 types.setBounds(a, List.of(syms.objectType));
740 }
741 a.tsym.flags_field &= ~UNATTRIBUTED;
742 }
743 for (JCTypeParameter tvar : typarams) {
744 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
745 }
746 }
748 /**
749 * Attribute the type references in a list of annotations.
750 */
751 void attribAnnotationTypes(List<JCAnnotation> annotations,
752 Env<AttrContext> env) {
753 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
754 JCAnnotation a = al.head;
755 attribType(a.annotationType, env);
756 }
757 }
759 /**
760 * Attribute a "lazy constant value".
761 * @param env The env for the const value
762 * @param initializer The initializer for the const value
763 * @param type The expected type, or null
764 * @see VarSymbol#setLazyConstValue
765 */
766 public Object attribLazyConstantValue(Env<AttrContext> env,
767 JCVariableDecl variable,
768 Type type) {
770 DiagnosticPosition prevLintPos
771 = deferredLintHandler.setPos(variable.pos());
773 try {
774 // Use null as symbol to not attach the type annotation to any symbol.
775 // The initializer will later also be visited and then we'll attach
776 // to the symbol.
777 // This prevents having multiple type annotations, just because of
778 // lazy constant value evaluation.
779 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
780 annotate.flush();
781 Type itype = attribExpr(variable.init, env, type);
782 if (itype.constValue() != null) {
783 return coerce(itype, type).constValue();
784 } else {
785 return null;
786 }
787 } finally {
788 deferredLintHandler.setPos(prevLintPos);
789 }
790 }
792 /** Attribute type reference in an `extends' or `implements' clause.
793 * Supertypes of anonymous inner classes are usually already attributed.
794 *
795 * @param tree The tree making up the type reference.
796 * @param env The environment current at the reference.
797 * @param classExpected true if only a class is expected here.
798 * @param interfaceExpected true if only an interface is expected here.
799 */
800 Type attribBase(JCTree tree,
801 Env<AttrContext> env,
802 boolean classExpected,
803 boolean interfaceExpected,
804 boolean checkExtensible) {
805 Type t = tree.type != null ?
806 tree.type :
807 attribType(tree, env);
808 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
809 }
810 Type checkBase(Type t,
811 JCTree tree,
812 Env<AttrContext> env,
813 boolean classExpected,
814 boolean interfaceExpected,
815 boolean checkExtensible) {
816 if (t.isErroneous())
817 return t;
818 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
819 // check that type variable is already visible
820 if (t.getUpperBound() == null) {
821 log.error(tree.pos(), "illegal.forward.ref");
822 return types.createErrorType(t);
823 }
824 } else {
825 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
826 }
827 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
828 log.error(tree.pos(), "intf.expected.here");
829 // return errType is necessary since otherwise there might
830 // be undetected cycles which cause attribution to loop
831 return types.createErrorType(t);
832 } else if (checkExtensible &&
833 classExpected &&
834 (t.tsym.flags() & INTERFACE) != 0) {
835 log.error(tree.pos(), "no.intf.expected.here");
836 return types.createErrorType(t);
837 }
838 if (checkExtensible &&
839 ((t.tsym.flags() & FINAL) != 0)) {
840 log.error(tree.pos(),
841 "cant.inherit.from.final", t.tsym);
842 }
843 chk.checkNonCyclic(tree.pos(), t);
844 return t;
845 }
847 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
848 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
849 id.type = env.info.scope.owner.type;
850 id.sym = env.info.scope.owner;
851 return id.type;
852 }
854 public void visitClassDef(JCClassDecl tree) {
855 // Local classes have not been entered yet, so we need to do it now:
856 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
857 enter.classEnter(tree, env);
859 ClassSymbol c = tree.sym;
860 if (c == null) {
861 // exit in case something drastic went wrong during enter.
862 result = null;
863 } else {
864 // make sure class has been completed:
865 c.complete();
867 // If this class appears as an anonymous class
868 // in a superclass constructor call where
869 // no explicit outer instance is given,
870 // disable implicit outer instance from being passed.
871 // (This would be an illegal access to "this before super").
872 if (env.info.isSelfCall &&
873 env.tree.hasTag(NEWCLASS) &&
874 ((JCNewClass) env.tree).encl == null)
875 {
876 c.flags_field |= NOOUTERTHIS;
877 }
878 attribClass(tree.pos(), c);
879 result = tree.type = c.type;
880 }
881 }
883 public void visitMethodDef(JCMethodDecl tree) {
884 MethodSymbol m = tree.sym;
885 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
887 Lint lint = env.info.lint.augment(m);
888 Lint prevLint = chk.setLint(lint);
889 MethodSymbol prevMethod = chk.setMethod(m);
890 try {
891 deferredLintHandler.flush(tree.pos());
892 chk.checkDeprecatedAnnotation(tree.pos(), m);
895 // Create a new environment with local scope
896 // for attributing the method.
897 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
898 localEnv.info.lint = lint;
900 attribStats(tree.typarams, localEnv);
902 // If we override any other methods, check that we do so properly.
903 // JLS ???
904 if (m.isStatic()) {
905 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
906 } else {
907 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
908 }
909 chk.checkOverride(tree, m);
911 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
912 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
913 }
915 // Enter all type parameters into the local method scope.
916 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
917 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
919 ClassSymbol owner = env.enclClass.sym;
920 if ((owner.flags() & ANNOTATION) != 0 &&
921 tree.params.nonEmpty())
922 log.error(tree.params.head.pos(),
923 "intf.annotation.members.cant.have.params");
925 // Attribute all value parameters.
926 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
927 attribStat(l.head, localEnv);
928 }
930 chk.checkVarargsMethodDecl(localEnv, tree);
932 // Check that type parameters are well-formed.
933 chk.validate(tree.typarams, localEnv);
935 // Check that result type is well-formed.
936 chk.validate(tree.restype, localEnv);
938 // Check that receiver type is well-formed.
939 if (tree.recvparam != null) {
940 // Use a new environment to check the receiver parameter.
941 // Otherwise I get "might not have been initialized" errors.
942 // Is there a better way?
943 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
944 attribType(tree.recvparam, newEnv);
945 chk.validate(tree.recvparam, newEnv);
946 }
948 // annotation method checks
949 if ((owner.flags() & ANNOTATION) != 0) {
950 // annotation method cannot have throws clause
951 if (tree.thrown.nonEmpty()) {
952 log.error(tree.thrown.head.pos(),
953 "throws.not.allowed.in.intf.annotation");
954 }
955 // annotation method cannot declare type-parameters
956 if (tree.typarams.nonEmpty()) {
957 log.error(tree.typarams.head.pos(),
958 "intf.annotation.members.cant.have.type.params");
959 }
960 // validate annotation method's return type (could be an annotation type)
961 chk.validateAnnotationType(tree.restype);
962 // ensure that annotation method does not clash with members of Object/Annotation
963 chk.validateAnnotationMethod(tree.pos(), m);
964 }
966 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
967 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
969 if (tree.body == null) {
970 // Empty bodies are only allowed for
971 // abstract, native, or interface methods, or for methods
972 // in a retrofit signature class.
973 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
974 !relax)
975 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
976 if (tree.defaultValue != null) {
977 if ((owner.flags() & ANNOTATION) == 0)
978 log.error(tree.pos(),
979 "default.allowed.in.intf.annotation.member");
980 }
981 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
982 if ((owner.flags() & INTERFACE) != 0) {
983 log.error(tree.body.pos(), "intf.meth.cant.have.body");
984 } else {
985 log.error(tree.pos(), "abstract.meth.cant.have.body");
986 }
987 } else if ((tree.mods.flags & NATIVE) != 0) {
988 log.error(tree.pos(), "native.meth.cant.have.body");
989 } else {
990 // Add an implicit super() call unless an explicit call to
991 // super(...) or this(...) is given
992 // or we are compiling class java.lang.Object.
993 if (tree.name == names.init && owner.type != syms.objectType) {
994 JCBlock body = tree.body;
995 if (body.stats.isEmpty() ||
996 !TreeInfo.isSelfCall(body.stats.head)) {
997 body.stats = body.stats.
998 prepend(memberEnter.SuperCall(make.at(body.pos),
999 List.<Type>nil(),
1000 List.<JCVariableDecl>nil(),
1001 false));
1002 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1003 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1004 TreeInfo.isSuperCall(body.stats.head)) {
1005 // enum constructors are not allowed to call super
1006 // directly, so make sure there aren't any super calls
1007 // in enum constructors, except in the compiler
1008 // generated one.
1009 log.error(tree.body.stats.head.pos(),
1010 "call.to.super.not.allowed.in.enum.ctor",
1011 env.enclClass.sym);
1012 }
1013 }
1015 // Attribute all type annotations in the body
1016 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1017 annotate.flush();
1019 // Attribute method body.
1020 attribStat(tree.body, localEnv);
1021 }
1023 localEnv.info.scope.leave();
1024 result = tree.type = m.type;
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, tree.pos());
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);
1060 try {
1061 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1062 deferredLintHandler.flush(tree.pos());
1063 chk.checkDeprecatedAnnotation(tree.pos(), v);
1065 if (tree.init != null) {
1066 if ((v.flags_field & FINAL) == 0 ||
1067 !memberEnter.needsLazyConstValue(tree.init)) {
1068 // Not a compile-time constant
1069 // Attribute initializer in a new environment
1070 // with the declared variable as owner.
1071 // Check that initializer conforms to variable's declared type.
1072 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1073 initEnv.info.lint = lint;
1074 // In order to catch self-references, we set the variable's
1075 // declaration position to maximal possible value, effectively
1076 // marking the variable as undefined.
1077 initEnv.info.enclVar = v;
1078 attribExpr(tree.init, initEnv, v.type);
1079 }
1080 }
1081 result = tree.type = v.type;
1082 }
1083 finally {
1084 chk.setLint(prevLint);
1085 }
1086 }
1088 public void visitSkip(JCSkip tree) {
1089 result = null;
1090 }
1092 public void visitBlock(JCBlock tree) {
1093 if (env.info.scope.owner.kind == TYP) {
1094 // Block is a static or instance initializer;
1095 // let the owner of the environment be a freshly
1096 // created BLOCK-method.
1097 Env<AttrContext> localEnv =
1098 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1099 localEnv.info.scope.owner =
1100 new MethodSymbol(tree.flags | BLOCK |
1101 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1102 env.info.scope.owner);
1103 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1105 // Attribute all type annotations in the block
1106 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1107 annotate.flush();
1109 {
1110 // Store init and clinit type annotations with the ClassSymbol
1111 // to allow output in Gen.normalizeDefs.
1112 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1113 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1114 if ((tree.flags & STATIC) != 0) {
1115 cs.appendClassInitTypeAttributes(tas);
1116 } else {
1117 cs.appendInitTypeAttributes(tas);
1118 }
1119 }
1121 attribStats(tree.stats, localEnv);
1122 } else {
1123 // Create a new local environment with a local scope.
1124 Env<AttrContext> localEnv =
1125 env.dup(tree, env.info.dup(env.info.scope.dup()));
1126 try {
1127 attribStats(tree.stats, localEnv);
1128 } finally {
1129 localEnv.info.scope.leave();
1130 }
1131 }
1132 result = null;
1133 }
1135 public void visitDoLoop(JCDoWhileLoop tree) {
1136 attribStat(tree.body, env.dup(tree));
1137 attribExpr(tree.cond, env, syms.booleanType);
1138 result = null;
1139 }
1141 public void visitWhileLoop(JCWhileLoop tree) {
1142 attribExpr(tree.cond, env, syms.booleanType);
1143 attribStat(tree.body, env.dup(tree));
1144 result = null;
1145 }
1147 public void visitForLoop(JCForLoop tree) {
1148 Env<AttrContext> loopEnv =
1149 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1150 try {
1151 attribStats(tree.init, loopEnv);
1152 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1153 loopEnv.tree = tree; // before, we were not in loop!
1154 attribStats(tree.step, loopEnv);
1155 attribStat(tree.body, loopEnv);
1156 result = null;
1157 }
1158 finally {
1159 loopEnv.info.scope.leave();
1160 }
1161 }
1163 public void visitForeachLoop(JCEnhancedForLoop tree) {
1164 Env<AttrContext> loopEnv =
1165 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1166 try {
1167 //the Formal Parameter of a for-each loop is not in the scope when
1168 //attributing the for-each expression; we mimick this by attributing
1169 //the for-each expression first (against original scope).
1170 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1171 attribStat(tree.var, loopEnv);
1172 chk.checkNonVoid(tree.pos(), exprType);
1173 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1174 if (elemtype == null) {
1175 // or perhaps expr implements Iterable<T>?
1176 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1177 if (base == null) {
1178 log.error(tree.expr.pos(),
1179 "foreach.not.applicable.to.type",
1180 exprType,
1181 diags.fragment("type.req.array.or.iterable"));
1182 elemtype = types.createErrorType(exprType);
1183 } else {
1184 List<Type> iterableParams = base.allparams();
1185 elemtype = iterableParams.isEmpty()
1186 ? syms.objectType
1187 : types.upperBound(iterableParams.head);
1188 }
1189 }
1190 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1191 loopEnv.tree = tree; // before, we were not in loop!
1192 attribStat(tree.body, loopEnv);
1193 result = null;
1194 }
1195 finally {
1196 loopEnv.info.scope.leave();
1197 }
1198 }
1200 public void visitLabelled(JCLabeledStatement tree) {
1201 // Check that label is not used in an enclosing statement
1202 Env<AttrContext> env1 = env;
1203 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1204 if (env1.tree.hasTag(LABELLED) &&
1205 ((JCLabeledStatement) env1.tree).label == tree.label) {
1206 log.error(tree.pos(), "label.already.in.use",
1207 tree.label);
1208 break;
1209 }
1210 env1 = env1.next;
1211 }
1213 attribStat(tree.body, env.dup(tree));
1214 result = null;
1215 }
1217 public void visitSwitch(JCSwitch tree) {
1218 Type seltype = attribExpr(tree.selector, env);
1220 Env<AttrContext> switchEnv =
1221 env.dup(tree, env.info.dup(env.info.scope.dup()));
1223 try {
1225 boolean enumSwitch =
1226 allowEnums &&
1227 (seltype.tsym.flags() & Flags.ENUM) != 0;
1228 boolean stringSwitch = false;
1229 if (types.isSameType(seltype, syms.stringType)) {
1230 if (allowStringsInSwitch) {
1231 stringSwitch = true;
1232 } else {
1233 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1234 }
1235 }
1236 if (!enumSwitch && !stringSwitch)
1237 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1239 // Attribute all cases and
1240 // check that there are no duplicate case labels or default clauses.
1241 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1242 boolean hasDefault = false; // Is there a default label?
1243 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1244 JCCase c = l.head;
1245 Env<AttrContext> caseEnv =
1246 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1247 try {
1248 if (c.pat != null) {
1249 if (enumSwitch) {
1250 Symbol sym = enumConstant(c.pat, seltype);
1251 if (sym == null) {
1252 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1253 } else if (!labels.add(sym)) {
1254 log.error(c.pos(), "duplicate.case.label");
1255 }
1256 } else {
1257 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1258 if (!pattype.hasTag(ERROR)) {
1259 if (pattype.constValue() == null) {
1260 log.error(c.pat.pos(),
1261 (stringSwitch ? "string.const.req" : "const.expr.req"));
1262 } else if (labels.contains(pattype.constValue())) {
1263 log.error(c.pos(), "duplicate.case.label");
1264 } else {
1265 labels.add(pattype.constValue());
1266 }
1267 }
1268 }
1269 } else if (hasDefault) {
1270 log.error(c.pos(), "duplicate.default.label");
1271 } else {
1272 hasDefault = true;
1273 }
1274 attribStats(c.stats, caseEnv);
1275 } finally {
1276 caseEnv.info.scope.leave();
1277 addVars(c.stats, switchEnv.info.scope);
1278 }
1279 }
1281 result = null;
1282 }
1283 finally {
1284 switchEnv.info.scope.leave();
1285 }
1286 }
1287 // where
1288 /** Add any variables defined in stats to the switch scope. */
1289 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1290 for (;stats.nonEmpty(); stats = stats.tail) {
1291 JCTree stat = stats.head;
1292 if (stat.hasTag(VARDEF))
1293 switchScope.enter(((JCVariableDecl) stat).sym);
1294 }
1295 }
1296 // where
1297 /** Return the selected enumeration constant symbol, or null. */
1298 private Symbol enumConstant(JCTree tree, Type enumType) {
1299 if (!tree.hasTag(IDENT)) {
1300 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1301 return syms.errSymbol;
1302 }
1303 JCIdent ident = (JCIdent)tree;
1304 Name name = ident.name;
1305 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1306 e.scope != null; e = e.next()) {
1307 if (e.sym.kind == VAR) {
1308 Symbol s = ident.sym = e.sym;
1309 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1310 ident.type = s.type;
1311 return ((s.flags_field & Flags.ENUM) == 0)
1312 ? null : s;
1313 }
1314 }
1315 return null;
1316 }
1318 public void visitSynchronized(JCSynchronized tree) {
1319 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1320 attribStat(tree.body, env);
1321 result = null;
1322 }
1324 public void visitTry(JCTry tree) {
1325 // Create a new local environment with a local
1326 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1327 try {
1328 boolean isTryWithResource = tree.resources.nonEmpty();
1329 // Create a nested environment for attributing the try block if needed
1330 Env<AttrContext> tryEnv = isTryWithResource ?
1331 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1332 localEnv;
1333 try {
1334 // Attribute resource declarations
1335 for (JCTree resource : tree.resources) {
1336 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1337 @Override
1338 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1339 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1340 }
1341 };
1342 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1343 if (resource.hasTag(VARDEF)) {
1344 attribStat(resource, tryEnv);
1345 twrResult.check(resource, resource.type);
1347 //check that resource type cannot throw InterruptedException
1348 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1350 VarSymbol var = ((JCVariableDecl) resource).sym;
1351 var.setData(ElementKind.RESOURCE_VARIABLE);
1352 } else {
1353 attribTree(resource, tryEnv, twrResult);
1354 }
1355 }
1356 // Attribute body
1357 attribStat(tree.body, tryEnv);
1358 } finally {
1359 if (isTryWithResource)
1360 tryEnv.info.scope.leave();
1361 }
1363 // Attribute catch clauses
1364 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1365 JCCatch c = l.head;
1366 Env<AttrContext> catchEnv =
1367 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1368 try {
1369 Type ctype = attribStat(c.param, catchEnv);
1370 if (TreeInfo.isMultiCatch(c)) {
1371 //multi-catch parameter is implicitly marked as final
1372 c.param.sym.flags_field |= FINAL | UNION;
1373 }
1374 if (c.param.sym.kind == Kinds.VAR) {
1375 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1376 }
1377 chk.checkType(c.param.vartype.pos(),
1378 chk.checkClassType(c.param.vartype.pos(), ctype),
1379 syms.throwableType);
1380 attribStat(c.body, catchEnv);
1381 } finally {
1382 catchEnv.info.scope.leave();
1383 }
1384 }
1386 // Attribute finalizer
1387 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1388 result = null;
1389 }
1390 finally {
1391 localEnv.info.scope.leave();
1392 }
1393 }
1395 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1396 if (!resource.isErroneous() &&
1397 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1398 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1399 Symbol close = syms.noSymbol;
1400 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1401 try {
1402 close = rs.resolveQualifiedMethod(pos,
1403 env,
1404 resource,
1405 names.close,
1406 List.<Type>nil(),
1407 List.<Type>nil());
1408 }
1409 finally {
1410 log.popDiagnosticHandler(discardHandler);
1411 }
1412 if (close.kind == MTH &&
1413 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1414 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1415 env.info.lint.isEnabled(LintCategory.TRY)) {
1416 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1417 }
1418 }
1419 }
1421 public void visitConditional(JCConditional tree) {
1422 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1424 tree.polyKind = (!allowPoly ||
1425 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1426 isBooleanOrNumeric(env, tree)) ?
1427 PolyKind.STANDALONE : PolyKind.POLY;
1429 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1430 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1431 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1432 result = tree.type = types.createErrorType(resultInfo.pt);
1433 return;
1434 }
1436 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1437 unknownExprInfo :
1438 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1439 //this will use enclosing check context to check compatibility of
1440 //subexpression against target type; if we are in a method check context,
1441 //depending on whether boxing is allowed, we could have incompatibilities
1442 @Override
1443 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1444 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1445 }
1446 });
1448 Type truetype = attribTree(tree.truepart, env, condInfo);
1449 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1451 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1452 if (condtype.constValue() != null &&
1453 truetype.constValue() != null &&
1454 falsetype.constValue() != null &&
1455 !owntype.hasTag(NONE)) {
1456 //constant folding
1457 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1458 }
1459 result = check(tree, owntype, VAL, resultInfo);
1460 }
1461 //where
1462 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1463 switch (tree.getTag()) {
1464 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1465 ((JCLiteral)tree).typetag == BOOLEAN ||
1466 ((JCLiteral)tree).typetag == BOT;
1467 case LAMBDA: case REFERENCE: return false;
1468 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1469 case CONDEXPR:
1470 JCConditional condTree = (JCConditional)tree;
1471 return isBooleanOrNumeric(env, condTree.truepart) &&
1472 isBooleanOrNumeric(env, condTree.falsepart);
1473 case APPLY:
1474 JCMethodInvocation speculativeMethodTree =
1475 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1476 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1477 return types.unboxedTypeOrType(owntype).isPrimitive();
1478 case NEWCLASS:
1479 JCExpression className =
1480 removeClassParams.translate(((JCNewClass)tree).clazz);
1481 JCExpression speculativeNewClassTree =
1482 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1483 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1484 default:
1485 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1486 speculativeType = types.unboxedTypeOrType(speculativeType);
1487 return speculativeType.isPrimitive();
1488 }
1489 }
1490 //where
1491 TreeTranslator removeClassParams = new TreeTranslator() {
1492 @Override
1493 public void visitTypeApply(JCTypeApply tree) {
1494 result = translate(tree.clazz);
1495 }
1496 };
1498 /** Compute the type of a conditional expression, after
1499 * checking that it exists. See JLS 15.25. Does not take into
1500 * account the special case where condition and both arms
1501 * are constants.
1502 *
1503 * @param pos The source position to be used for error
1504 * diagnostics.
1505 * @param thentype The type of the expression's then-part.
1506 * @param elsetype The type of the expression's else-part.
1507 */
1508 private Type condType(DiagnosticPosition pos,
1509 Type thentype, Type elsetype) {
1510 // If same type, that is the result
1511 if (types.isSameType(thentype, elsetype))
1512 return thentype.baseType();
1514 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1515 ? thentype : types.unboxedType(thentype);
1516 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1517 ? elsetype : types.unboxedType(elsetype);
1519 // Otherwise, if both arms can be converted to a numeric
1520 // type, return the least numeric type that fits both arms
1521 // (i.e. return larger of the two, or return int if one
1522 // arm is short, the other is char).
1523 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1524 // If one arm has an integer subrange type (i.e., byte,
1525 // short, or char), and the other is an integer constant
1526 // that fits into the subrange, return the subrange type.
1527 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1528 elseUnboxed.hasTag(INT) &&
1529 types.isAssignable(elseUnboxed, thenUnboxed)) {
1530 return thenUnboxed.baseType();
1531 }
1532 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1533 thenUnboxed.hasTag(INT) &&
1534 types.isAssignable(thenUnboxed, elseUnboxed)) {
1535 return elseUnboxed.baseType();
1536 }
1538 for (TypeTag tag : primitiveTags) {
1539 Type candidate = syms.typeOfTag[tag.ordinal()];
1540 if (types.isSubtype(thenUnboxed, candidate) &&
1541 types.isSubtype(elseUnboxed, candidate)) {
1542 return candidate;
1543 }
1544 }
1545 }
1547 // Those were all the cases that could result in a primitive
1548 if (allowBoxing) {
1549 if (thentype.isPrimitive())
1550 thentype = types.boxedClass(thentype).type;
1551 if (elsetype.isPrimitive())
1552 elsetype = types.boxedClass(elsetype).type;
1553 }
1555 if (types.isSubtype(thentype, elsetype))
1556 return elsetype.baseType();
1557 if (types.isSubtype(elsetype, thentype))
1558 return thentype.baseType();
1560 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1561 log.error(pos, "neither.conditional.subtype",
1562 thentype, elsetype);
1563 return thentype.baseType();
1564 }
1566 // both are known to be reference types. The result is
1567 // lub(thentype,elsetype). This cannot fail, as it will
1568 // always be possible to infer "Object" if nothing better.
1569 return types.lub(thentype.baseType(), elsetype.baseType());
1570 }
1572 final static TypeTag[] primitiveTags = new TypeTag[]{
1573 BYTE,
1574 CHAR,
1575 SHORT,
1576 INT,
1577 LONG,
1578 FLOAT,
1579 DOUBLE,
1580 BOOLEAN,
1581 };
1583 public void visitIf(JCIf tree) {
1584 attribExpr(tree.cond, env, syms.booleanType);
1585 attribStat(tree.thenpart, env);
1586 if (tree.elsepart != null)
1587 attribStat(tree.elsepart, env);
1588 chk.checkEmptyIf(tree);
1589 result = null;
1590 }
1592 public void visitExec(JCExpressionStatement tree) {
1593 //a fresh environment is required for 292 inference to work properly ---
1594 //see Infer.instantiatePolymorphicSignatureInstance()
1595 Env<AttrContext> localEnv = env.dup(tree);
1596 attribExpr(tree.expr, localEnv);
1597 result = null;
1598 }
1600 public void visitBreak(JCBreak tree) {
1601 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1602 result = null;
1603 }
1605 public void visitContinue(JCContinue tree) {
1606 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1607 result = null;
1608 }
1609 //where
1610 /** Return the target of a break or continue statement, if it exists,
1611 * report an error if not.
1612 * Note: The target of a labelled break or continue is the
1613 * (non-labelled) statement tree referred to by the label,
1614 * not the tree representing the labelled statement itself.
1615 *
1616 * @param pos The position to be used for error diagnostics
1617 * @param tag The tag of the jump statement. This is either
1618 * Tree.BREAK or Tree.CONTINUE.
1619 * @param label The label of the jump statement, or null if no
1620 * label is given.
1621 * @param env The environment current at the jump statement.
1622 */
1623 private JCTree findJumpTarget(DiagnosticPosition pos,
1624 JCTree.Tag tag,
1625 Name label,
1626 Env<AttrContext> env) {
1627 // Search environments outwards from the point of jump.
1628 Env<AttrContext> env1 = env;
1629 LOOP:
1630 while (env1 != null) {
1631 switch (env1.tree.getTag()) {
1632 case LABELLED:
1633 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1634 if (label == labelled.label) {
1635 // If jump is a continue, check that target is a loop.
1636 if (tag == CONTINUE) {
1637 if (!labelled.body.hasTag(DOLOOP) &&
1638 !labelled.body.hasTag(WHILELOOP) &&
1639 !labelled.body.hasTag(FORLOOP) &&
1640 !labelled.body.hasTag(FOREACHLOOP))
1641 log.error(pos, "not.loop.label", label);
1642 // Found labelled statement target, now go inwards
1643 // to next non-labelled tree.
1644 return TreeInfo.referencedStatement(labelled);
1645 } else {
1646 return labelled;
1647 }
1648 }
1649 break;
1650 case DOLOOP:
1651 case WHILELOOP:
1652 case FORLOOP:
1653 case FOREACHLOOP:
1654 if (label == null) return env1.tree;
1655 break;
1656 case SWITCH:
1657 if (label == null && tag == BREAK) return env1.tree;
1658 break;
1659 case LAMBDA:
1660 case METHODDEF:
1661 case CLASSDEF:
1662 break LOOP;
1663 default:
1664 }
1665 env1 = env1.next;
1666 }
1667 if (label != null)
1668 log.error(pos, "undef.label", label);
1669 else if (tag == CONTINUE)
1670 log.error(pos, "cont.outside.loop");
1671 else
1672 log.error(pos, "break.outside.switch.loop");
1673 return null;
1674 }
1676 public void visitReturn(JCReturn tree) {
1677 // Check that there is an enclosing method which is
1678 // nested within than the enclosing class.
1679 if (env.info.returnResult == null) {
1680 log.error(tree.pos(), "ret.outside.meth");
1681 } else {
1682 // Attribute return expression, if it exists, and check that
1683 // it conforms to result type of enclosing method.
1684 if (tree.expr != null) {
1685 if (env.info.returnResult.pt.hasTag(VOID)) {
1686 env.info.returnResult.checkContext.report(tree.expr.pos(),
1687 diags.fragment("unexpected.ret.val"));
1688 }
1689 attribTree(tree.expr, env, env.info.returnResult);
1690 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1691 !env.info.returnResult.pt.hasTag(NONE)) {
1692 env.info.returnResult.checkContext.report(tree.pos(),
1693 diags.fragment("missing.ret.val"));
1694 }
1695 }
1696 result = null;
1697 }
1699 public void visitThrow(JCThrow tree) {
1700 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1701 if (allowPoly) {
1702 chk.checkType(tree, owntype, syms.throwableType);
1703 }
1704 result = null;
1705 }
1707 public void visitAssert(JCAssert tree) {
1708 attribExpr(tree.cond, env, syms.booleanType);
1709 if (tree.detail != null) {
1710 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1711 }
1712 result = null;
1713 }
1715 /** Visitor method for method invocations.
1716 * NOTE: The method part of an application will have in its type field
1717 * the return type of the method, not the method's type itself!
1718 */
1719 public void visitApply(JCMethodInvocation tree) {
1720 // The local environment of a method application is
1721 // a new environment nested in the current one.
1722 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1724 // The types of the actual method arguments.
1725 List<Type> argtypes;
1727 // The types of the actual method type arguments.
1728 List<Type> typeargtypes = null;
1730 Name methName = TreeInfo.name(tree.meth);
1732 boolean isConstructorCall =
1733 methName == names._this || methName == names._super;
1735 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1736 if (isConstructorCall) {
1737 // We are seeing a ...this(...) or ...super(...) call.
1738 // Check that this is the first statement in a constructor.
1739 if (checkFirstConstructorStat(tree, env)) {
1741 // Record the fact
1742 // that this is a constructor call (using isSelfCall).
1743 localEnv.info.isSelfCall = true;
1745 // Attribute arguments, yielding list of argument types.
1746 attribArgs(tree.args, localEnv, argtypesBuf);
1747 argtypes = argtypesBuf.toList();
1748 typeargtypes = attribTypes(tree.typeargs, localEnv);
1750 // Variable `site' points to the class in which the called
1751 // constructor is defined.
1752 Type site = env.enclClass.sym.type;
1753 if (methName == names._super) {
1754 if (site == syms.objectType) {
1755 log.error(tree.meth.pos(), "no.superclass", site);
1756 site = types.createErrorType(syms.objectType);
1757 } else {
1758 site = types.supertype(site);
1759 }
1760 }
1762 if (site.hasTag(CLASS)) {
1763 Type encl = site.getEnclosingType();
1764 while (encl != null && encl.hasTag(TYPEVAR))
1765 encl = encl.getUpperBound();
1766 if (encl.hasTag(CLASS)) {
1767 // we are calling a nested class
1769 if (tree.meth.hasTag(SELECT)) {
1770 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1772 // We are seeing a prefixed call, of the form
1773 // <expr>.super(...).
1774 // Check that the prefix expression conforms
1775 // to the outer instance type of the class.
1776 chk.checkRefType(qualifier.pos(),
1777 attribExpr(qualifier, localEnv,
1778 encl));
1779 } else if (methName == names._super) {
1780 // qualifier omitted; check for existence
1781 // of an appropriate implicit qualifier.
1782 rs.resolveImplicitThis(tree.meth.pos(),
1783 localEnv, site, true);
1784 }
1785 } else if (tree.meth.hasTag(SELECT)) {
1786 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1787 site.tsym);
1788 }
1790 // if we're calling a java.lang.Enum constructor,
1791 // prefix the implicit String and int parameters
1792 if (site.tsym == syms.enumSym && allowEnums)
1793 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1795 // Resolve the called constructor under the assumption
1796 // that we are referring to a superclass instance of the
1797 // current instance (JLS ???).
1798 boolean selectSuperPrev = localEnv.info.selectSuper;
1799 localEnv.info.selectSuper = true;
1800 localEnv.info.pendingResolutionPhase = null;
1801 Symbol sym = rs.resolveConstructor(
1802 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1803 localEnv.info.selectSuper = selectSuperPrev;
1805 // Set method symbol to resolved constructor...
1806 TreeInfo.setSymbol(tree.meth, sym);
1808 // ...and check that it is legal in the current context.
1809 // (this will also set the tree's type)
1810 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1811 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1812 }
1813 // Otherwise, `site' is an error type and we do nothing
1814 }
1815 result = tree.type = syms.voidType;
1816 } else {
1817 // Otherwise, we are seeing a regular method call.
1818 // Attribute the arguments, yielding list of argument types, ...
1819 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1820 argtypes = argtypesBuf.toList();
1821 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1823 // ... and attribute the method using as a prototype a methodtype
1824 // whose formal argument types is exactly the list of actual
1825 // arguments (this will also set the method symbol).
1826 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1827 localEnv.info.pendingResolutionPhase = null;
1828 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1830 // Compute the result type.
1831 Type restype = mtype.getReturnType();
1832 if (restype.hasTag(WILDCARD))
1833 throw new AssertionError(mtype);
1835 Type qualifier = (tree.meth.hasTag(SELECT))
1836 ? ((JCFieldAccess) tree.meth).selected.type
1837 : env.enclClass.sym.type;
1838 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1840 chk.checkRefTypes(tree.typeargs, typeargtypes);
1842 // Check that value of resulting type is admissible in the
1843 // current context. Also, capture the return type
1844 result = check(tree, capture(restype), VAL, resultInfo);
1845 }
1846 chk.validate(tree.typeargs, localEnv);
1847 }
1848 //where
1849 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1850 if (allowCovariantReturns &&
1851 methodName == names.clone &&
1852 types.isArray(qualifierType)) {
1853 // as a special case, array.clone() has a result that is
1854 // the same as static type of the array being cloned
1855 return qualifierType;
1856 } else if (allowGenerics &&
1857 methodName == names.getClass &&
1858 argtypes.isEmpty()) {
1859 // as a special case, x.getClass() has type Class<? extends |X|>
1860 return new ClassType(restype.getEnclosingType(),
1861 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1862 BoundKind.EXTENDS,
1863 syms.boundClass)),
1864 restype.tsym);
1865 } else {
1866 return restype;
1867 }
1868 }
1870 /** Check that given application node appears as first statement
1871 * in a constructor call.
1872 * @param tree The application node
1873 * @param env The environment current at the application.
1874 */
1875 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1876 JCMethodDecl enclMethod = env.enclMethod;
1877 if (enclMethod != null && enclMethod.name == names.init) {
1878 JCBlock body = enclMethod.body;
1879 if (body.stats.head.hasTag(EXEC) &&
1880 ((JCExpressionStatement) body.stats.head).expr == tree)
1881 return true;
1882 }
1883 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1884 TreeInfo.name(tree.meth));
1885 return false;
1886 }
1888 /** Obtain a method type with given argument types.
1889 */
1890 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1891 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1892 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1893 }
1895 public void visitNewClass(final JCNewClass tree) {
1896 Type owntype = types.createErrorType(tree.type);
1898 // The local environment of a class creation is
1899 // a new environment nested in the current one.
1900 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1902 // The anonymous inner class definition of the new expression,
1903 // if one is defined by it.
1904 JCClassDecl cdef = tree.def;
1906 // If enclosing class is given, attribute it, and
1907 // complete class name to be fully qualified
1908 JCExpression clazz = tree.clazz; // Class field following new
1909 JCExpression clazzid; // Identifier in class field
1910 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1911 annoclazzid = null;
1913 if (clazz.hasTag(TYPEAPPLY)) {
1914 clazzid = ((JCTypeApply) clazz).clazz;
1915 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1916 annoclazzid = (JCAnnotatedType) clazzid;
1917 clazzid = annoclazzid.underlyingType;
1918 }
1919 } else {
1920 if (clazz.hasTag(ANNOTATED_TYPE)) {
1921 annoclazzid = (JCAnnotatedType) clazz;
1922 clazzid = annoclazzid.underlyingType;
1923 } else {
1924 clazzid = clazz;
1925 }
1926 }
1928 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1930 if (tree.encl != null) {
1931 // We are seeing a qualified new, of the form
1932 // <expr>.new C <...> (...) ...
1933 // In this case, we let clazz stand for the name of the
1934 // allocated class C prefixed with the type of the qualifier
1935 // expression, so that we can
1936 // resolve it with standard techniques later. I.e., if
1937 // <expr> has type T, then <expr>.new C <...> (...)
1938 // yields a clazz T.C.
1939 Type encltype = chk.checkRefType(tree.encl.pos(),
1940 attribExpr(tree.encl, env));
1941 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1942 // from expr to the combined type, or not? Yes, do this.
1943 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1944 ((JCIdent) clazzid).name);
1946 EndPosTable endPosTable = this.env.toplevel.endPositions;
1947 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1948 if (clazz.hasTag(ANNOTATED_TYPE)) {
1949 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1950 List<JCAnnotation> annos = annoType.annotations;
1952 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1953 clazzid1 = make.at(tree.pos).
1954 TypeApply(clazzid1,
1955 ((JCTypeApply) clazz).arguments);
1956 }
1958 clazzid1 = make.at(tree.pos).
1959 AnnotatedType(annos, clazzid1);
1960 } else if (clazz.hasTag(TYPEAPPLY)) {
1961 clazzid1 = make.at(tree.pos).
1962 TypeApply(clazzid1,
1963 ((JCTypeApply) clazz).arguments);
1964 }
1966 clazz = clazzid1;
1967 }
1969 // Attribute clazz expression and store
1970 // symbol + type back into the attributed tree.
1971 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1972 attribIdentAsEnumType(env, (JCIdent)clazz) :
1973 attribType(clazz, env);
1975 clazztype = chk.checkDiamond(tree, clazztype);
1976 chk.validate(clazz, localEnv);
1977 if (tree.encl != null) {
1978 // We have to work in this case to store
1979 // symbol + type back into the attributed tree.
1980 tree.clazz.type = clazztype;
1981 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1982 clazzid.type = ((JCIdent) clazzid).sym.type;
1983 if (annoclazzid != null) {
1984 annoclazzid.type = clazzid.type;
1985 }
1986 if (!clazztype.isErroneous()) {
1987 if (cdef != null && clazztype.tsym.isInterface()) {
1988 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1989 } else if (clazztype.tsym.isStatic()) {
1990 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1991 }
1992 }
1993 } else if (!clazztype.tsym.isInterface() &&
1994 clazztype.getEnclosingType().hasTag(CLASS)) {
1995 // Check for the existence of an apropos outer instance
1996 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1997 }
1999 // Attribute constructor arguments.
2000 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2001 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
2002 List<Type> argtypes = argtypesBuf.toList();
2003 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2005 // If we have made no mistakes in the class type...
2006 if (clazztype.hasTag(CLASS)) {
2007 // Enums may not be instantiated except implicitly
2008 if (allowEnums &&
2009 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2010 (!env.tree.hasTag(VARDEF) ||
2011 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2012 ((JCVariableDecl) env.tree).init != tree))
2013 log.error(tree.pos(), "enum.cant.be.instantiated");
2014 // Check that class is not abstract
2015 if (cdef == null &&
2016 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2017 log.error(tree.pos(), "abstract.cant.be.instantiated",
2018 clazztype.tsym);
2019 } else if (cdef != null && clazztype.tsym.isInterface()) {
2020 // Check that no constructor arguments are given to
2021 // anonymous classes implementing an interface
2022 if (!argtypes.isEmpty())
2023 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2025 if (!typeargtypes.isEmpty())
2026 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2028 // Error recovery: pretend no arguments were supplied.
2029 argtypes = List.nil();
2030 typeargtypes = List.nil();
2031 } else if (TreeInfo.isDiamond(tree)) {
2032 ClassType site = new ClassType(clazztype.getEnclosingType(),
2033 clazztype.tsym.type.getTypeArguments(),
2034 clazztype.tsym);
2036 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2037 diamondEnv.info.selectSuper = cdef != null;
2038 diamondEnv.info.pendingResolutionPhase = null;
2040 //if the type of the instance creation expression is a class type
2041 //apply method resolution inference (JLS 15.12.2.7). The return type
2042 //of the resolved constructor will be a partially instantiated type
2043 Symbol constructor = rs.resolveDiamond(tree.pos(),
2044 diamondEnv,
2045 site,
2046 argtypes,
2047 typeargtypes);
2048 tree.constructor = constructor.baseSymbol();
2050 final TypeSymbol csym = clazztype.tsym;
2051 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2052 @Override
2053 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2054 enclosingContext.report(tree.clazz,
2055 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2056 }
2057 });
2058 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2059 constructorType = checkId(tree, site,
2060 constructor,
2061 diamondEnv,
2062 diamondResult);
2064 tree.clazz.type = types.createErrorType(clazztype);
2065 if (!constructorType.isErroneous()) {
2066 tree.clazz.type = clazztype = constructorType.getReturnType();
2067 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2068 }
2069 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2070 }
2072 // Resolve the called constructor under the assumption
2073 // that we are referring to a superclass instance of the
2074 // current instance (JLS ???).
2075 else {
2076 //the following code alters some of the fields in the current
2077 //AttrContext - hence, the current context must be dup'ed in
2078 //order to avoid downstream failures
2079 Env<AttrContext> rsEnv = localEnv.dup(tree);
2080 rsEnv.info.selectSuper = cdef != null;
2081 rsEnv.info.pendingResolutionPhase = null;
2082 tree.constructor = rs.resolveConstructor(
2083 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2084 if (cdef == null) { //do not check twice!
2085 tree.constructorType = checkId(tree,
2086 clazztype,
2087 tree.constructor,
2088 rsEnv,
2089 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2090 if (rsEnv.info.lastResolveVarargs())
2091 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2092 }
2093 if (cdef == null &&
2094 !clazztype.isErroneous() &&
2095 clazztype.getTypeArguments().nonEmpty() &&
2096 findDiamonds) {
2097 findDiamond(localEnv, tree, clazztype);
2098 }
2099 }
2101 if (cdef != null) {
2102 // We are seeing an anonymous class instance creation.
2103 // In this case, the class instance creation
2104 // expression
2105 //
2106 // E.new <typeargs1>C<typargs2>(args) { ... }
2107 //
2108 // is represented internally as
2109 //
2110 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2111 //
2112 // This expression is then *transformed* as follows:
2113 //
2114 // (1) add a STATIC flag to the class definition
2115 // if the current environment is static
2116 // (2) add an extends or implements clause
2117 // (3) add a constructor.
2118 //
2119 // For instance, if C is a class, and ET is the type of E,
2120 // the expression
2121 //
2122 // E.new <typeargs1>C<typargs2>(args) { ... }
2123 //
2124 // is translated to (where X is a fresh name and typarams is the
2125 // parameter list of the super constructor):
2126 //
2127 // new <typeargs1>X(<*nullchk*>E, args) where
2128 // X extends C<typargs2> {
2129 // <typarams> X(ET e, args) {
2130 // e.<typeargs1>super(args)
2131 // }
2132 // ...
2133 // }
2134 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2136 if (clazztype.tsym.isInterface()) {
2137 cdef.implementing = List.of(clazz);
2138 } else {
2139 cdef.extending = clazz;
2140 }
2142 attribStat(cdef, localEnv);
2144 checkLambdaCandidate(tree, cdef.sym, clazztype);
2146 // If an outer instance is given,
2147 // prefix it to the constructor arguments
2148 // and delete it from the new expression
2149 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2150 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2151 argtypes = argtypes.prepend(tree.encl.type);
2152 tree.encl = null;
2153 }
2155 // Reassign clazztype and recompute constructor.
2156 clazztype = cdef.sym.type;
2157 Symbol sym = tree.constructor = rs.resolveConstructor(
2158 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2159 Assert.check(sym.kind < AMBIGUOUS);
2160 tree.constructor = sym;
2161 tree.constructorType = checkId(tree,
2162 clazztype,
2163 tree.constructor,
2164 localEnv,
2165 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2166 } else {
2167 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2168 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2169 tree.clazz.type.tsym);
2170 }
2171 }
2173 if (tree.constructor != null && tree.constructor.kind == MTH)
2174 owntype = clazztype;
2175 }
2176 result = check(tree, owntype, VAL, resultInfo);
2177 chk.validate(tree.typeargs, localEnv);
2178 }
2179 //where
2180 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2181 JCTypeApply ta = (JCTypeApply)tree.clazz;
2182 List<JCExpression> prevTypeargs = ta.arguments;
2183 try {
2184 //create a 'fake' diamond AST node by removing type-argument trees
2185 ta.arguments = List.nil();
2186 ResultInfo findDiamondResult = new ResultInfo(VAL,
2187 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2188 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2189 Type polyPt = allowPoly ?
2190 syms.objectType :
2191 clazztype;
2192 if (!inferred.isErroneous() &&
2193 (allowPoly && pt() == Infer.anyPoly ?
2194 types.isSameType(inferred, clazztype) :
2195 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2196 String key = types.isSameType(clazztype, inferred) ?
2197 "diamond.redundant.args" :
2198 "diamond.redundant.args.1";
2199 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2200 }
2201 } finally {
2202 ta.arguments = prevTypeargs;
2203 }
2204 }
2206 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2207 if (allowLambda &&
2208 identifyLambdaCandidate &&
2209 clazztype.hasTag(CLASS) &&
2210 !pt().hasTag(NONE) &&
2211 types.isFunctionalInterface(clazztype.tsym)) {
2212 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2213 int count = 0;
2214 boolean found = false;
2215 for (Symbol sym : csym.members().getElements()) {
2216 if ((sym.flags() & SYNTHETIC) != 0 ||
2217 sym.isConstructor()) continue;
2218 count++;
2219 if (sym.kind != MTH ||
2220 !sym.name.equals(descriptor.name)) continue;
2221 Type mtype = types.memberType(clazztype, sym);
2222 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2223 found = true;
2224 }
2225 }
2226 if (found && count == 1) {
2227 log.note(tree.def, "potential.lambda.found");
2228 }
2229 }
2230 }
2232 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2233 Symbol sym) {
2234 // Ensure that no declaration annotations are present.
2235 // Note that a tree type might be an AnnotatedType with
2236 // empty annotations, if only declaration annotations were given.
2237 // This method will raise an error for such a type.
2238 for (JCAnnotation ai : annotations) {
2239 if (!ai.type.isErroneous() &&
2240 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2241 log.error(ai.pos(), "annotation.type.not.applicable");
2242 }
2243 }
2244 }
2247 /** Make an attributed null check tree.
2248 */
2249 public JCExpression makeNullCheck(JCExpression arg) {
2250 // optimization: X.this is never null; skip null check
2251 Name name = TreeInfo.name(arg);
2252 if (name == names._this || name == names._super) return arg;
2254 JCTree.Tag optag = NULLCHK;
2255 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2256 tree.operator = syms.nullcheck;
2257 tree.type = arg.type;
2258 return tree;
2259 }
2261 public void visitNewArray(JCNewArray tree) {
2262 Type owntype = types.createErrorType(tree.type);
2263 Env<AttrContext> localEnv = env.dup(tree);
2264 Type elemtype;
2265 if (tree.elemtype != null) {
2266 elemtype = attribType(tree.elemtype, localEnv);
2267 chk.validate(tree.elemtype, localEnv);
2268 owntype = elemtype;
2269 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2270 attribExpr(l.head, localEnv, syms.intType);
2271 owntype = new ArrayType(owntype, syms.arrayClass);
2272 }
2273 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2274 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2275 tree.elemtype.type.tsym);
2276 }
2277 } else {
2278 // we are seeing an untyped aggregate { ... }
2279 // this is allowed only if the prototype is an array
2280 if (pt().hasTag(ARRAY)) {
2281 elemtype = types.elemtype(pt());
2282 } else {
2283 if (!pt().hasTag(ERROR)) {
2284 log.error(tree.pos(), "illegal.initializer.for.type",
2285 pt());
2286 }
2287 elemtype = types.createErrorType(pt());
2288 }
2289 }
2290 if (tree.elems != null) {
2291 attribExprs(tree.elems, localEnv, elemtype);
2292 owntype = new ArrayType(elemtype, syms.arrayClass);
2293 }
2294 if (!types.isReifiable(elemtype))
2295 log.error(tree.pos(), "generic.array.creation");
2296 result = check(tree, owntype, VAL, resultInfo);
2297 }
2299 /*
2300 * A lambda expression can only be attributed when a target-type is available.
2301 * In addition, if the target-type is that of a functional interface whose
2302 * descriptor contains inference variables in argument position the lambda expression
2303 * is 'stuck' (see DeferredAttr).
2304 */
2305 @Override
2306 public void visitLambda(final JCLambda that) {
2307 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2308 if (pt().hasTag(NONE)) {
2309 //lambda only allowed in assignment or method invocation/cast context
2310 log.error(that.pos(), "unexpected.lambda");
2311 }
2312 result = that.type = types.createErrorType(pt());
2313 return;
2314 }
2315 //create an environment for attribution of the lambda expression
2316 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2317 boolean needsRecovery =
2318 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2319 try {
2320 Type currentTarget = pt();
2321 List<Type> explicitParamTypes = null;
2322 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2323 //attribute lambda parameters
2324 attribStats(that.params, localEnv);
2325 explicitParamTypes = TreeInfo.types(that.params);
2326 }
2328 Type lambdaType;
2329 if (pt() != Type.recoveryType) {
2330 /* We need to adjust the target. If the target is an
2331 * intersection type, for example: SAM & I1 & I2 ...
2332 * the target will be updated to SAM
2333 */
2334 currentTarget = targetChecker.visit(currentTarget, that);
2335 if (explicitParamTypes != null) {
2336 currentTarget = infer.instantiateFunctionalInterface(that,
2337 currentTarget, explicitParamTypes, resultInfo.checkContext);
2338 }
2339 lambdaType = types.findDescriptorType(currentTarget);
2340 } else {
2341 currentTarget = Type.recoveryType;
2342 lambdaType = fallbackDescriptorType(that);
2343 }
2345 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2347 if (lambdaType.hasTag(FORALL)) {
2348 //lambda expression target desc cannot be a generic method
2349 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2350 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2351 result = that.type = types.createErrorType(pt());
2352 return;
2353 }
2355 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2356 //add param type info in the AST
2357 List<Type> actuals = lambdaType.getParameterTypes();
2358 List<JCVariableDecl> params = that.params;
2360 boolean arityMismatch = false;
2362 while (params.nonEmpty()) {
2363 if (actuals.isEmpty()) {
2364 //not enough actuals to perform lambda parameter inference
2365 arityMismatch = true;
2366 }
2367 //reset previously set info
2368 Type argType = arityMismatch ?
2369 syms.errType :
2370 actuals.head;
2371 params.head.vartype = make.at(params.head).Type(argType);
2372 params.head.sym = null;
2373 actuals = actuals.isEmpty() ?
2374 actuals :
2375 actuals.tail;
2376 params = params.tail;
2377 }
2379 //attribute lambda parameters
2380 attribStats(that.params, localEnv);
2382 if (arityMismatch) {
2383 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2384 result = that.type = types.createErrorType(currentTarget);
2385 return;
2386 }
2387 }
2389 //from this point on, no recovery is needed; if we are in assignment context
2390 //we will be able to attribute the whole lambda body, regardless of errors;
2391 //if we are in a 'check' method context, and the lambda is not compatible
2392 //with the target-type, it will be recovered anyway in Attr.checkId
2393 needsRecovery = false;
2395 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2396 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2397 new FunctionalReturnContext(resultInfo.checkContext);
2399 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2400 recoveryInfo :
2401 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2402 localEnv.info.returnResult = bodyResultInfo;
2404 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2405 attribTree(that.getBody(), localEnv, bodyResultInfo);
2406 } else {
2407 JCBlock body = (JCBlock)that.body;
2408 attribStats(body.stats, localEnv);
2409 }
2411 result = check(that, currentTarget, VAL, resultInfo);
2413 boolean isSpeculativeRound =
2414 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2416 preFlow(that);
2417 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2419 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2421 if (!isSpeculativeRound) {
2422 //add thrown types as bounds to the thrown types free variables if needed:
2423 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2424 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2425 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asFree(lambdaType.getThrownTypes());
2427 chk.unhandled(inferredThrownTypes, thrownTypes);
2428 }
2430 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2431 }
2432 result = check(that, currentTarget, VAL, resultInfo);
2433 } catch (Types.FunctionDescriptorLookupError ex) {
2434 JCDiagnostic cause = ex.getDiagnostic();
2435 resultInfo.checkContext.report(that, cause);
2436 result = that.type = types.createErrorType(pt());
2437 return;
2438 } finally {
2439 localEnv.info.scope.leave();
2440 if (needsRecovery) {
2441 attribTree(that, env, recoveryInfo);
2442 }
2443 }
2444 }
2445 //where
2446 void preFlow(JCLambda tree) {
2447 new PostAttrAnalyzer() {
2448 @Override
2449 public void scan(JCTree tree) {
2450 if (tree == null ||
2451 (tree.type != null &&
2452 tree.type == Type.stuckType)) {
2453 //don't touch stuck expressions!
2454 return;
2455 }
2456 super.scan(tree);
2457 }
2458 }.scan(tree);
2459 }
2461 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2463 @Override
2464 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2465 return t.isCompound() ?
2466 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2467 }
2469 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2470 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2471 Type target = null;
2472 for (Type bound : ict.getExplicitComponents()) {
2473 TypeSymbol boundSym = bound.tsym;
2474 if (types.isFunctionalInterface(boundSym) &&
2475 types.findDescriptorSymbol(boundSym) == desc) {
2476 target = bound;
2477 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2478 //bound must be an interface
2479 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2480 }
2481 }
2482 return target != null ?
2483 target :
2484 ict.getExplicitComponents().head; //error recovery
2485 }
2487 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2488 ListBuffer<Type> targs = new ListBuffer<>();
2489 ListBuffer<Type> supertypes = new ListBuffer<>();
2490 for (Type i : ict.interfaces_field) {
2491 if (i.isParameterized()) {
2492 targs.appendList(i.tsym.type.allparams());
2493 }
2494 supertypes.append(i.tsym.type);
2495 }
2496 IntersectionClassType notionalIntf =
2497 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2498 notionalIntf.allparams_field = targs.toList();
2499 notionalIntf.tsym.flags_field |= INTERFACE;
2500 return notionalIntf.tsym;
2501 }
2503 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2504 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2505 diags.fragment(key, args)));
2506 }
2507 };
2509 private Type fallbackDescriptorType(JCExpression tree) {
2510 switch (tree.getTag()) {
2511 case LAMBDA:
2512 JCLambda lambda = (JCLambda)tree;
2513 List<Type> argtypes = List.nil();
2514 for (JCVariableDecl param : lambda.params) {
2515 argtypes = param.vartype != null ?
2516 argtypes.append(param.vartype.type) :
2517 argtypes.append(syms.errType);
2518 }
2519 return new MethodType(argtypes, Type.recoveryType,
2520 List.of(syms.throwableType), syms.methodClass);
2521 case REFERENCE:
2522 return new MethodType(List.<Type>nil(), Type.recoveryType,
2523 List.of(syms.throwableType), syms.methodClass);
2524 default:
2525 Assert.error("Cannot get here!");
2526 }
2527 return null;
2528 }
2530 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2531 final InferenceContext inferenceContext, final Type... ts) {
2532 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2533 }
2535 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2536 final InferenceContext inferenceContext, final List<Type> ts) {
2537 if (inferenceContext.free(ts)) {
2538 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2539 @Override
2540 public void typesInferred(InferenceContext inferenceContext) {
2541 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2542 }
2543 });
2544 } else {
2545 for (Type t : ts) {
2546 rs.checkAccessibleType(env, t);
2547 }
2548 }
2549 }
2551 /**
2552 * Lambda/method reference have a special check context that ensures
2553 * that i.e. a lambda return type is compatible with the expected
2554 * type according to both the inherited context and the assignment
2555 * context.
2556 */
2557 class FunctionalReturnContext extends Check.NestedCheckContext {
2559 FunctionalReturnContext(CheckContext enclosingContext) {
2560 super(enclosingContext);
2561 }
2563 @Override
2564 public boolean compatible(Type found, Type req, Warner warn) {
2565 //return type must be compatible in both current context and assignment context
2566 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2567 }
2569 @Override
2570 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2571 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2572 }
2573 }
2575 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2577 JCExpression expr;
2579 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2580 super(enclosingContext);
2581 this.expr = expr;
2582 }
2584 @Override
2585 public boolean compatible(Type found, Type req, Warner warn) {
2586 //a void return is compatible with an expression statement lambda
2587 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2588 super.compatible(found, req, warn);
2589 }
2590 }
2592 /**
2593 * Lambda compatibility. Check that given return types, thrown types, parameter types
2594 * are compatible with the expected functional interface descriptor. This means that:
2595 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2596 * types must be compatible with the return type of the expected descriptor.
2597 */
2598 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2599 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2601 //return values have already been checked - but if lambda has no return
2602 //values, we must ensure that void/value compatibility is correct;
2603 //this amounts at checking that, if a lambda body can complete normally,
2604 //the descriptor's return type must be void
2605 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2606 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2607 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2608 diags.fragment("missing.ret.val", returnType)));
2609 }
2611 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2612 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2613 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2614 }
2615 }
2617 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2618 Env<AttrContext> lambdaEnv;
2619 Symbol owner = env.info.scope.owner;
2620 if (owner.kind == VAR && owner.owner.kind == TYP) {
2621 //field initializer
2622 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2623 lambdaEnv.info.scope.owner =
2624 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2625 env.info.scope.owner);
2626 } else {
2627 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2628 }
2629 return lambdaEnv;
2630 }
2632 @Override
2633 public void visitReference(final JCMemberReference that) {
2634 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2635 if (pt().hasTag(NONE)) {
2636 //method reference only allowed in assignment or method invocation/cast context
2637 log.error(that.pos(), "unexpected.mref");
2638 }
2639 result = that.type = types.createErrorType(pt());
2640 return;
2641 }
2642 final Env<AttrContext> localEnv = env.dup(that);
2643 try {
2644 //attribute member reference qualifier - if this is a constructor
2645 //reference, the expected kind must be a type
2646 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2648 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2649 exprType = chk.checkConstructorRefType(that.expr, exprType);
2650 if (!exprType.isErroneous() &&
2651 exprType.isRaw() &&
2652 that.typeargs != null) {
2653 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2654 diags.fragment("mref.infer.and.explicit.params"));
2655 exprType = types.createErrorType(exprType);
2656 }
2657 }
2659 if (exprType.isErroneous()) {
2660 //if the qualifier expression contains problems,
2661 //give up attribution of method reference
2662 result = that.type = exprType;
2663 return;
2664 }
2666 if (TreeInfo.isStaticSelector(that.expr, names)) {
2667 //if the qualifier is a type, validate it; raw warning check is
2668 //omitted as we don't know at this stage as to whether this is a
2669 //raw selector (because of inference)
2670 chk.validate(that.expr, env, false);
2671 }
2673 //attrib type-arguments
2674 List<Type> typeargtypes = List.nil();
2675 if (that.typeargs != null) {
2676 typeargtypes = attribTypes(that.typeargs, localEnv);
2677 }
2679 Type target;
2680 Type desc;
2681 if (pt() != Type.recoveryType) {
2682 target = targetChecker.visit(pt(), that);
2683 desc = types.findDescriptorType(target);
2684 } else {
2685 target = Type.recoveryType;
2686 desc = fallbackDescriptorType(that);
2687 }
2689 setFunctionalInfo(localEnv, that, pt(), desc, target, resultInfo.checkContext);
2690 List<Type> argtypes = desc.getParameterTypes();
2691 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2693 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2694 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2695 }
2697 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2698 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2699 try {
2700 refResult = rs.resolveMemberReference(that.pos(), localEnv, that, that.expr.type,
2701 that.name, argtypes, typeargtypes, true, referenceCheck,
2702 resultInfo.checkContext.inferenceContext());
2703 } finally {
2704 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2705 }
2707 Symbol refSym = refResult.fst;
2708 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2710 if (refSym.kind != MTH) {
2711 boolean targetError;
2712 switch (refSym.kind) {
2713 case ABSENT_MTH:
2714 targetError = false;
2715 break;
2716 case WRONG_MTH:
2717 case WRONG_MTHS:
2718 case AMBIGUOUS:
2719 case HIDDEN:
2720 case STATICERR:
2721 case MISSING_ENCL:
2722 targetError = true;
2723 break;
2724 default:
2725 Assert.error("unexpected result kind " + refSym.kind);
2726 targetError = false;
2727 }
2729 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2730 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2732 JCDiagnostic.DiagnosticType diagKind = targetError ?
2733 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2735 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2736 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2738 if (targetError && target == Type.recoveryType) {
2739 //a target error doesn't make sense during recovery stage
2740 //as we don't know what actual parameter types are
2741 result = that.type = target;
2742 return;
2743 } else {
2744 if (targetError) {
2745 resultInfo.checkContext.report(that, diag);
2746 } else {
2747 log.report(diag);
2748 }
2749 result = that.type = types.createErrorType(target);
2750 return;
2751 }
2752 }
2754 that.sym = refSym.baseSymbol();
2755 that.kind = lookupHelper.referenceKind(that.sym);
2756 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2758 if (desc.getReturnType() == Type.recoveryType) {
2759 // stop here
2760 result = that.type = target;
2761 return;
2762 }
2764 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2766 if (that.getMode() == ReferenceMode.INVOKE &&
2767 TreeInfo.isStaticSelector(that.expr, names) &&
2768 that.kind.isUnbound() &&
2769 !desc.getParameterTypes().head.isParameterized()) {
2770 chk.checkRaw(that.expr, localEnv);
2771 }
2773 if (!that.kind.isUnbound() &&
2774 that.getMode() == ReferenceMode.INVOKE &&
2775 TreeInfo.isStaticSelector(that.expr, names) &&
2776 !that.sym.isStatic()) {
2777 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2778 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2779 result = that.type = types.createErrorType(target);
2780 return;
2781 }
2783 if (that.kind.isUnbound() &&
2784 that.getMode() == ReferenceMode.INVOKE &&
2785 TreeInfo.isStaticSelector(that.expr, names) &&
2786 that.sym.isStatic()) {
2787 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2788 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2789 result = that.type = types.createErrorType(target);
2790 return;
2791 }
2793 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2794 exprType.getTypeArguments().nonEmpty()) {
2795 //static ref with class type-args
2796 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2797 diags.fragment("static.mref.with.targs"));
2798 result = that.type = types.createErrorType(target);
2799 return;
2800 }
2802 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2803 !that.kind.isUnbound()) {
2804 //no static bound mrefs
2805 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2806 diags.fragment("static.bound.mref"));
2807 result = that.type = types.createErrorType(target);
2808 return;
2809 }
2811 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2812 // Check that super-qualified symbols are not abstract (JLS)
2813 rs.checkNonAbstract(that.pos(), that.sym);
2814 }
2815 }
2817 ResultInfo checkInfo =
2818 resultInfo.dup(newMethodTemplate(
2819 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2820 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes));
2822 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2824 if (that.kind.isUnbound() &&
2825 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2826 //re-generate inference constraints for unbound receiver
2827 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asFree(argtypes.head), exprType)) {
2828 //cannot happen as this has already been checked - we just need
2829 //to regenerate the inference constraints, as that has been lost
2830 //as a result of the call to inferenceContext.save()
2831 Assert.error("Can't get here");
2832 }
2833 }
2835 if (!refType.isErroneous()) {
2836 refType = types.createMethodTypeWithReturn(refType,
2837 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2838 }
2840 //go ahead with standard method reference compatibility check - note that param check
2841 //is a no-op (as this has been taken care during method applicability)
2842 boolean isSpeculativeRound =
2843 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2844 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2845 if (!isSpeculativeRound) {
2846 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2847 }
2848 result = check(that, target, VAL, resultInfo);
2849 } catch (Types.FunctionDescriptorLookupError ex) {
2850 JCDiagnostic cause = ex.getDiagnostic();
2851 resultInfo.checkContext.report(that, cause);
2852 result = that.type = types.createErrorType(pt());
2853 return;
2854 }
2855 }
2856 //where
2857 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2858 //if this is a constructor reference, the expected kind must be a type
2859 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2860 }
2863 @SuppressWarnings("fallthrough")
2864 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2865 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2867 Type resType;
2868 switch (tree.getMode()) {
2869 case NEW:
2870 if (!tree.expr.type.isRaw()) {
2871 resType = tree.expr.type;
2872 break;
2873 }
2874 default:
2875 resType = refType.getReturnType();
2876 }
2878 Type incompatibleReturnType = resType;
2880 if (returnType.hasTag(VOID)) {
2881 incompatibleReturnType = null;
2882 }
2884 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2885 if (resType.isErroneous() ||
2886 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2887 incompatibleReturnType = null;
2888 }
2889 }
2891 if (incompatibleReturnType != null) {
2892 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2893 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2894 }
2896 if (!speculativeAttr) {
2897 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2898 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2899 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2900 }
2901 }
2902 }
2904 /**
2905 * Set functional type info on the underlying AST. Note: as the target descriptor
2906 * might contain inference variables, we might need to register an hook in the
2907 * current inference context.
2908 */
2909 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2910 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2911 if (checkContext.inferenceContext().free(descriptorType)) {
2912 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2913 public void typesInferred(InferenceContext inferenceContext) {
2914 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2915 inferenceContext.asInstType(primaryTarget), checkContext);
2916 }
2917 });
2918 } else {
2919 ListBuffer<Type> targets = new ListBuffer<>();
2920 if (pt.hasTag(CLASS)) {
2921 if (pt.isCompound()) {
2922 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2923 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2924 if (t != primaryTarget) {
2925 targets.append(types.removeWildcards(t));
2926 }
2927 }
2928 } else {
2929 targets.append(types.removeWildcards(primaryTarget));
2930 }
2931 }
2932 fExpr.targets = targets.toList();
2933 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2934 pt != Type.recoveryType) {
2935 //check that functional interface class is well-formed
2936 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2937 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2938 if (csym != null) {
2939 chk.checkImplementations(env.tree, csym, csym);
2940 }
2941 }
2942 }
2943 }
2945 public void visitParens(JCParens tree) {
2946 Type owntype = attribTree(tree.expr, env, resultInfo);
2947 result = check(tree, owntype, pkind(), resultInfo);
2948 Symbol sym = TreeInfo.symbol(tree);
2949 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2950 log.error(tree.pos(), "illegal.start.of.type");
2951 }
2953 public void visitAssign(JCAssign tree) {
2954 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2955 Type capturedType = capture(owntype);
2956 attribExpr(tree.rhs, env, owntype);
2957 result = check(tree, capturedType, VAL, resultInfo);
2958 }
2960 public void visitAssignop(JCAssignOp tree) {
2961 // Attribute arguments.
2962 Type owntype = attribTree(tree.lhs, env, varInfo);
2963 Type operand = attribExpr(tree.rhs, env);
2964 // Find operator.
2965 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2966 tree.pos(), tree.getTag().noAssignOp(), env,
2967 owntype, operand);
2969 if (operator.kind == MTH &&
2970 !owntype.isErroneous() &&
2971 !operand.isErroneous()) {
2972 chk.checkOperator(tree.pos(),
2973 (OperatorSymbol)operator,
2974 tree.getTag().noAssignOp(),
2975 owntype,
2976 operand);
2977 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2978 chk.checkCastable(tree.rhs.pos(),
2979 operator.type.getReturnType(),
2980 owntype);
2981 }
2982 result = check(tree, owntype, VAL, resultInfo);
2983 }
2985 public void visitUnary(JCUnary tree) {
2986 // Attribute arguments.
2987 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2988 ? attribTree(tree.arg, env, varInfo)
2989 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2991 // Find operator.
2992 Symbol operator = tree.operator =
2993 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2995 Type owntype = types.createErrorType(tree.type);
2996 if (operator.kind == MTH &&
2997 !argtype.isErroneous()) {
2998 owntype = (tree.getTag().isIncOrDecUnaryOp())
2999 ? tree.arg.type
3000 : operator.type.getReturnType();
3001 int opc = ((OperatorSymbol)operator).opcode;
3003 // If the argument is constant, fold it.
3004 if (argtype.constValue() != null) {
3005 Type ctype = cfolder.fold1(opc, argtype);
3006 if (ctype != null) {
3007 owntype = cfolder.coerce(ctype, owntype);
3009 // Remove constant types from arguments to
3010 // conserve space. The parser will fold concatenations
3011 // of string literals; the code here also
3012 // gets rid of intermediate results when some of the
3013 // operands are constant identifiers.
3014 if (tree.arg.type.tsym == syms.stringType.tsym) {
3015 tree.arg.type = syms.stringType;
3016 }
3017 }
3018 }
3019 }
3020 result = check(tree, owntype, VAL, resultInfo);
3021 }
3023 public void visitBinary(JCBinary tree) {
3024 // Attribute arguments.
3025 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3026 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3028 // Find operator.
3029 Symbol operator = tree.operator =
3030 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3032 Type owntype = types.createErrorType(tree.type);
3033 if (operator.kind == MTH &&
3034 !left.isErroneous() &&
3035 !right.isErroneous()) {
3036 owntype = operator.type.getReturnType();
3037 // This will figure out when unboxing can happen and
3038 // choose the right comparison operator.
3039 int opc = chk.checkOperator(tree.lhs.pos(),
3040 (OperatorSymbol)operator,
3041 tree.getTag(),
3042 left,
3043 right);
3045 // If both arguments are constants, fold them.
3046 if (left.constValue() != null && right.constValue() != null) {
3047 Type ctype = cfolder.fold2(opc, left, right);
3048 if (ctype != null) {
3049 owntype = cfolder.coerce(ctype, owntype);
3051 // Remove constant types from arguments to
3052 // conserve space. The parser will fold concatenations
3053 // of string literals; the code here also
3054 // gets rid of intermediate results when some of the
3055 // operands are constant identifiers.
3056 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3057 tree.lhs.type = syms.stringType;
3058 }
3059 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3060 tree.rhs.type = syms.stringType;
3061 }
3062 }
3063 }
3065 // Check that argument types of a reference ==, != are
3066 // castable to each other, (JLS 15.21). Note: unboxing
3067 // comparisons will not have an acmp* opc at this point.
3068 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3069 if (!types.isEqualityComparable(left, right,
3070 new Warner(tree.pos()))) {
3071 log.error(tree.pos(), "incomparable.types", left, right);
3072 }
3073 }
3075 chk.checkDivZero(tree.rhs.pos(), operator, right);
3076 }
3077 result = check(tree, owntype, VAL, resultInfo);
3078 }
3080 public void visitTypeCast(final JCTypeCast tree) {
3081 Type clazztype = attribType(tree.clazz, env);
3082 chk.validate(tree.clazz, env, false);
3083 //a fresh environment is required for 292 inference to work properly ---
3084 //see Infer.instantiatePolymorphicSignatureInstance()
3085 Env<AttrContext> localEnv = env.dup(tree);
3086 //should we propagate the target type?
3087 final ResultInfo castInfo;
3088 JCExpression expr = TreeInfo.skipParens(tree.expr);
3089 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3090 if (isPoly) {
3091 //expression is a poly - we need to propagate target type info
3092 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3093 @Override
3094 public boolean compatible(Type found, Type req, Warner warn) {
3095 return types.isCastable(found, req, warn);
3096 }
3097 });
3098 } else {
3099 //standalone cast - target-type info is not propagated
3100 castInfo = unknownExprInfo;
3101 }
3102 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3103 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3104 if (exprtype.constValue() != null)
3105 owntype = cfolder.coerce(exprtype, owntype);
3106 result = check(tree, capture(owntype), VAL, resultInfo);
3107 if (!isPoly)
3108 chk.checkRedundantCast(localEnv, tree);
3109 }
3111 public void visitTypeTest(JCInstanceOf tree) {
3112 Type exprtype = chk.checkNullOrRefType(
3113 tree.expr.pos(), attribExpr(tree.expr, env));
3114 Type clazztype = attribType(tree.clazz, env);
3115 if (!clazztype.hasTag(TYPEVAR)) {
3116 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3117 }
3118 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3119 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3120 clazztype = types.createErrorType(clazztype);
3121 }
3122 chk.validate(tree.clazz, env, false);
3123 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3124 result = check(tree, syms.booleanType, VAL, resultInfo);
3125 }
3127 public void visitIndexed(JCArrayAccess tree) {
3128 Type owntype = types.createErrorType(tree.type);
3129 Type atype = attribExpr(tree.indexed, env);
3130 attribExpr(tree.index, env, syms.intType);
3131 if (types.isArray(atype))
3132 owntype = types.elemtype(atype);
3133 else if (!atype.hasTag(ERROR))
3134 log.error(tree.pos(), "array.req.but.found", atype);
3135 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3136 result = check(tree, owntype, VAR, resultInfo);
3137 }
3139 public void visitIdent(JCIdent tree) {
3140 Symbol sym;
3142 // Find symbol
3143 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3144 // If we are looking for a method, the prototype `pt' will be a
3145 // method type with the type of the call's arguments as parameters.
3146 env.info.pendingResolutionPhase = null;
3147 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3148 } else if (tree.sym != null && tree.sym.kind != VAR) {
3149 sym = tree.sym;
3150 } else {
3151 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3152 }
3153 tree.sym = sym;
3155 // (1) Also find the environment current for the class where
3156 // sym is defined (`symEnv').
3157 // Only for pre-tiger versions (1.4 and earlier):
3158 // (2) Also determine whether we access symbol out of an anonymous
3159 // class in a this or super call. This is illegal for instance
3160 // members since such classes don't carry a this$n link.
3161 // (`noOuterThisPath').
3162 Env<AttrContext> symEnv = env;
3163 boolean noOuterThisPath = false;
3164 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3165 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3166 sym.owner.kind == TYP &&
3167 tree.name != names._this && tree.name != names._super) {
3169 // Find environment in which identifier is defined.
3170 while (symEnv.outer != null &&
3171 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3172 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3173 noOuterThisPath = !allowAnonOuterThis;
3174 symEnv = symEnv.outer;
3175 }
3176 }
3178 // If symbol is a variable, ...
3179 if (sym.kind == VAR) {
3180 VarSymbol v = (VarSymbol)sym;
3182 // ..., evaluate its initializer, if it has one, and check for
3183 // illegal forward reference.
3184 checkInit(tree, env, v, false);
3186 // If we are expecting a variable (as opposed to a value), check
3187 // that the variable is assignable in the current environment.
3188 if (pkind() == VAR)
3189 checkAssignable(tree.pos(), v, null, env);
3190 }
3192 // In a constructor body,
3193 // if symbol is a field or instance method, check that it is
3194 // not accessed before the supertype constructor is called.
3195 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3196 (sym.kind & (VAR | MTH)) != 0 &&
3197 sym.owner.kind == TYP &&
3198 (sym.flags() & STATIC) == 0) {
3199 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3200 }
3201 Env<AttrContext> env1 = env;
3202 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3203 // If the found symbol is inaccessible, then it is
3204 // accessed through an enclosing instance. Locate this
3205 // enclosing instance:
3206 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3207 env1 = env1.outer;
3208 }
3209 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3210 }
3212 public void visitSelect(JCFieldAccess tree) {
3213 // Determine the expected kind of the qualifier expression.
3214 int skind = 0;
3215 if (tree.name == names._this || tree.name == names._super ||
3216 tree.name == names._class)
3217 {
3218 skind = TYP;
3219 } else {
3220 if ((pkind() & PCK) != 0) skind = skind | PCK;
3221 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3222 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3223 }
3225 // Attribute the qualifier expression, and determine its symbol (if any).
3226 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3227 if ((pkind() & (PCK | TYP)) == 0)
3228 site = capture(site); // Capture field access
3230 // don't allow T.class T[].class, etc
3231 if (skind == TYP) {
3232 Type elt = site;
3233 while (elt.hasTag(ARRAY))
3234 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3235 if (elt.hasTag(TYPEVAR)) {
3236 log.error(tree.pos(), "type.var.cant.be.deref");
3237 result = types.createErrorType(tree.type);
3238 return;
3239 }
3240 }
3242 // If qualifier symbol is a type or `super', assert `selectSuper'
3243 // for the selection. This is relevant for determining whether
3244 // protected symbols are accessible.
3245 Symbol sitesym = TreeInfo.symbol(tree.selected);
3246 boolean selectSuperPrev = env.info.selectSuper;
3247 env.info.selectSuper =
3248 sitesym != null &&
3249 sitesym.name == names._super;
3251 // Determine the symbol represented by the selection.
3252 env.info.pendingResolutionPhase = null;
3253 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3254 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3255 site = capture(site);
3256 sym = selectSym(tree, sitesym, site, env, resultInfo);
3257 }
3258 boolean varArgs = env.info.lastResolveVarargs();
3259 tree.sym = sym;
3261 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3262 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3263 site = capture(site);
3264 }
3266 // If that symbol is a variable, ...
3267 if (sym.kind == VAR) {
3268 VarSymbol v = (VarSymbol)sym;
3270 // ..., evaluate its initializer, if it has one, and check for
3271 // illegal forward reference.
3272 checkInit(tree, env, v, true);
3274 // If we are expecting a variable (as opposed to a value), check
3275 // that the variable is assignable in the current environment.
3276 if (pkind() == VAR)
3277 checkAssignable(tree.pos(), v, tree.selected, env);
3278 }
3280 if (sitesym != null &&
3281 sitesym.kind == VAR &&
3282 ((VarSymbol)sitesym).isResourceVariable() &&
3283 sym.kind == MTH &&
3284 sym.name.equals(names.close) &&
3285 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3286 env.info.lint.isEnabled(LintCategory.TRY)) {
3287 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3288 }
3290 // Disallow selecting a type from an expression
3291 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3292 tree.type = check(tree.selected, pt(),
3293 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3294 }
3296 if (isType(sitesym)) {
3297 if (sym.name == names._this) {
3298 // If `C' is the currently compiled class, check that
3299 // C.this' does not appear in a call to a super(...)
3300 if (env.info.isSelfCall &&
3301 site.tsym == env.enclClass.sym) {
3302 chk.earlyRefError(tree.pos(), sym);
3303 }
3304 } else {
3305 // Check if type-qualified fields or methods are static (JLS)
3306 if ((sym.flags() & STATIC) == 0 &&
3307 !env.next.tree.hasTag(REFERENCE) &&
3308 sym.name != names._super &&
3309 (sym.kind == VAR || sym.kind == MTH)) {
3310 rs.accessBase(rs.new StaticError(sym),
3311 tree.pos(), site, sym.name, true);
3312 }
3313 }
3314 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3315 // If the qualified item is not a type and the selected item is static, report
3316 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3317 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3318 }
3320 // If we are selecting an instance member via a `super', ...
3321 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3323 // Check that super-qualified symbols are not abstract (JLS)
3324 rs.checkNonAbstract(tree.pos(), sym);
3326 if (site.isRaw()) {
3327 // Determine argument types for site.
3328 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3329 if (site1 != null) site = site1;
3330 }
3331 }
3333 env.info.selectSuper = selectSuperPrev;
3334 result = checkId(tree, site, sym, env, resultInfo);
3335 }
3336 //where
3337 /** Determine symbol referenced by a Select expression,
3338 *
3339 * @param tree The select tree.
3340 * @param site The type of the selected expression,
3341 * @param env The current environment.
3342 * @param resultInfo The current result.
3343 */
3344 private Symbol selectSym(JCFieldAccess tree,
3345 Symbol location,
3346 Type site,
3347 Env<AttrContext> env,
3348 ResultInfo resultInfo) {
3349 DiagnosticPosition pos = tree.pos();
3350 Name name = tree.name;
3351 switch (site.getTag()) {
3352 case PACKAGE:
3353 return rs.accessBase(
3354 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3355 pos, location, site, name, true);
3356 case ARRAY:
3357 case CLASS:
3358 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3359 return rs.resolveQualifiedMethod(
3360 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3361 } else if (name == names._this || name == names._super) {
3362 return rs.resolveSelf(pos, env, site.tsym, name);
3363 } else if (name == names._class) {
3364 // In this case, we have already made sure in
3365 // visitSelect that qualifier expression is a type.
3366 Type t = syms.classType;
3367 List<Type> typeargs = allowGenerics
3368 ? List.of(types.erasure(site))
3369 : List.<Type>nil();
3370 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3371 return new VarSymbol(
3372 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3373 } else {
3374 // We are seeing a plain identifier as selector.
3375 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3376 if ((resultInfo.pkind & ERRONEOUS) == 0)
3377 sym = rs.accessBase(sym, pos, location, site, name, true);
3378 return sym;
3379 }
3380 case WILDCARD:
3381 throw new AssertionError(tree);
3382 case TYPEVAR:
3383 // Normally, site.getUpperBound() shouldn't be null.
3384 // It should only happen during memberEnter/attribBase
3385 // when determining the super type which *must* beac
3386 // done before attributing the type variables. In
3387 // other words, we are seeing this illegal program:
3388 // class B<T> extends A<T.foo> {}
3389 Symbol sym = (site.getUpperBound() != null)
3390 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3391 : null;
3392 if (sym == null) {
3393 log.error(pos, "type.var.cant.be.deref");
3394 return syms.errSymbol;
3395 } else {
3396 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3397 rs.new AccessError(env, site, sym) :
3398 sym;
3399 rs.accessBase(sym2, pos, location, site, name, true);
3400 return sym;
3401 }
3402 case ERROR:
3403 // preserve identifier names through errors
3404 return types.createErrorType(name, site.tsym, site).tsym;
3405 default:
3406 // The qualifier expression is of a primitive type -- only
3407 // .class is allowed for these.
3408 if (name == names._class) {
3409 // In this case, we have already made sure in Select that
3410 // qualifier expression is a type.
3411 Type t = syms.classType;
3412 Type arg = types.boxedClass(site).type;
3413 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3414 return new VarSymbol(
3415 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3416 } else {
3417 log.error(pos, "cant.deref", site);
3418 return syms.errSymbol;
3419 }
3420 }
3421 }
3423 /** Determine type of identifier or select expression and check that
3424 * (1) the referenced symbol is not deprecated
3425 * (2) the symbol's type is safe (@see checkSafe)
3426 * (3) if symbol is a variable, check that its type and kind are
3427 * compatible with the prototype and protokind.
3428 * (4) if symbol is an instance field of a raw type,
3429 * which is being assigned to, issue an unchecked warning if its
3430 * type changes under erasure.
3431 * (5) if symbol is an instance method of a raw type, issue an
3432 * unchecked warning if its argument types change under erasure.
3433 * If checks succeed:
3434 * If symbol is a constant, return its constant type
3435 * else if symbol is a method, return its result type
3436 * otherwise return its type.
3437 * Otherwise return errType.
3438 *
3439 * @param tree The syntax tree representing the identifier
3440 * @param site If this is a select, the type of the selected
3441 * expression, otherwise the type of the current class.
3442 * @param sym The symbol representing the identifier.
3443 * @param env The current environment.
3444 * @param resultInfo The expected result
3445 */
3446 Type checkId(JCTree tree,
3447 Type site,
3448 Symbol sym,
3449 Env<AttrContext> env,
3450 ResultInfo resultInfo) {
3451 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3452 checkMethodId(tree, site, sym, env, resultInfo) :
3453 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3454 }
3456 Type checkMethodId(JCTree tree,
3457 Type site,
3458 Symbol sym,
3459 Env<AttrContext> env,
3460 ResultInfo resultInfo) {
3461 boolean isPolymorhicSignature =
3462 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3463 return isPolymorhicSignature ?
3464 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3465 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3466 }
3468 Type checkSigPolyMethodId(JCTree tree,
3469 Type site,
3470 Symbol sym,
3471 Env<AttrContext> env,
3472 ResultInfo resultInfo) {
3473 //recover original symbol for signature polymorphic methods
3474 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3475 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3476 return sym.type;
3477 }
3479 Type checkMethodIdInternal(JCTree tree,
3480 Type site,
3481 Symbol sym,
3482 Env<AttrContext> env,
3483 ResultInfo resultInfo) {
3484 if ((resultInfo.pkind & POLY) != 0) {
3485 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3486 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3487 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3488 return owntype;
3489 } else {
3490 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3491 }
3492 }
3494 Type checkIdInternal(JCTree tree,
3495 Type site,
3496 Symbol sym,
3497 Type pt,
3498 Env<AttrContext> env,
3499 ResultInfo resultInfo) {
3500 if (pt.isErroneous()) {
3501 return types.createErrorType(site);
3502 }
3503 Type owntype; // The computed type of this identifier occurrence.
3504 switch (sym.kind) {
3505 case TYP:
3506 // For types, the computed type equals the symbol's type,
3507 // except for two situations:
3508 owntype = sym.type;
3509 if (owntype.hasTag(CLASS)) {
3510 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3511 Type ownOuter = owntype.getEnclosingType();
3513 // (a) If the symbol's type is parameterized, erase it
3514 // because no type parameters were given.
3515 // We recover generic outer type later in visitTypeApply.
3516 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3517 owntype = types.erasure(owntype);
3518 }
3520 // (b) If the symbol's type is an inner class, then
3521 // we have to interpret its outer type as a superclass
3522 // of the site type. Example:
3523 //
3524 // class Tree<A> { class Visitor { ... } }
3525 // class PointTree extends Tree<Point> { ... }
3526 // ...PointTree.Visitor...
3527 //
3528 // Then the type of the last expression above is
3529 // Tree<Point>.Visitor.
3530 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3531 Type normOuter = site;
3532 if (normOuter.hasTag(CLASS)) {
3533 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3534 }
3535 if (normOuter == null) // perhaps from an import
3536 normOuter = types.erasure(ownOuter);
3537 if (normOuter != ownOuter)
3538 owntype = new ClassType(
3539 normOuter, List.<Type>nil(), owntype.tsym);
3540 }
3541 }
3542 break;
3543 case VAR:
3544 VarSymbol v = (VarSymbol)sym;
3545 // Test (4): if symbol is an instance field of a raw type,
3546 // which is being assigned to, issue an unchecked warning if
3547 // its type changes under erasure.
3548 if (allowGenerics &&
3549 resultInfo.pkind == VAR &&
3550 v.owner.kind == TYP &&
3551 (v.flags() & STATIC) == 0 &&
3552 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3553 Type s = types.asOuterSuper(site, v.owner);
3554 if (s != null &&
3555 s.isRaw() &&
3556 !types.isSameType(v.type, v.erasure(types))) {
3557 chk.warnUnchecked(tree.pos(),
3558 "unchecked.assign.to.var",
3559 v, s);
3560 }
3561 }
3562 // The computed type of a variable is the type of the
3563 // variable symbol, taken as a member of the site type.
3564 owntype = (sym.owner.kind == TYP &&
3565 sym.name != names._this && sym.name != names._super)
3566 ? types.memberType(site, sym)
3567 : sym.type;
3569 // If the variable is a constant, record constant value in
3570 // computed type.
3571 if (v.getConstValue() != null && isStaticReference(tree))
3572 owntype = owntype.constType(v.getConstValue());
3574 if (resultInfo.pkind == VAL) {
3575 owntype = capture(owntype); // capture "names as expressions"
3576 }
3577 break;
3578 case MTH: {
3579 owntype = checkMethod(site, sym,
3580 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3581 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3582 resultInfo.pt.getTypeArguments());
3583 break;
3584 }
3585 case PCK: case ERR:
3586 owntype = sym.type;
3587 break;
3588 default:
3589 throw new AssertionError("unexpected kind: " + sym.kind +
3590 " in tree " + tree);
3591 }
3593 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3594 // (for constructors, the error was given when the constructor was
3595 // resolved)
3597 if (sym.name != names.init) {
3598 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3599 chk.checkSunAPI(tree.pos(), sym);
3600 chk.checkProfile(tree.pos(), sym);
3601 }
3603 // Test (3): if symbol is a variable, check that its type and
3604 // kind are compatible with the prototype and protokind.
3605 return check(tree, owntype, sym.kind, resultInfo);
3606 }
3608 /** Check that variable is initialized and evaluate the variable's
3609 * initializer, if not yet done. Also check that variable is not
3610 * referenced before it is defined.
3611 * @param tree The tree making up the variable reference.
3612 * @param env The current environment.
3613 * @param v The variable's symbol.
3614 */
3615 private void checkInit(JCTree tree,
3616 Env<AttrContext> env,
3617 VarSymbol v,
3618 boolean onlyWarning) {
3619 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3620 // tree.pos + " " + v.pos + " " +
3621 // Resolve.isStatic(env));//DEBUG
3623 // A forward reference is diagnosed if the declaration position
3624 // of the variable is greater than the current tree position
3625 // and the tree and variable definition occur in the same class
3626 // definition. Note that writes don't count as references.
3627 // This check applies only to class and instance
3628 // variables. Local variables follow different scope rules,
3629 // and are subject to definite assignment checking.
3630 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3631 v.owner.kind == TYP &&
3632 canOwnInitializer(owner(env)) &&
3633 v.owner == env.info.scope.owner.enclClass() &&
3634 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3635 (!env.tree.hasTag(ASSIGN) ||
3636 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3637 String suffix = (env.info.enclVar == v) ?
3638 "self.ref" : "forward.ref";
3639 if (!onlyWarning || isStaticEnumField(v)) {
3640 log.error(tree.pos(), "illegal." + suffix);
3641 } else if (useBeforeDeclarationWarning) {
3642 log.warning(tree.pos(), suffix, v);
3643 }
3644 }
3646 v.getConstValue(); // ensure initializer is evaluated
3648 checkEnumInitializer(tree, env, v);
3649 }
3651 /**
3652 * Check for illegal references to static members of enum. In
3653 * an enum type, constructors and initializers may not
3654 * reference its static members unless they are constant.
3655 *
3656 * @param tree The tree making up the variable reference.
3657 * @param env The current environment.
3658 * @param v The variable's symbol.
3659 * @jls section 8.9 Enums
3660 */
3661 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3662 // JLS:
3663 //
3664 // "It is a compile-time error to reference a static field
3665 // of an enum type that is not a compile-time constant
3666 // (15.28) from constructors, instance initializer blocks,
3667 // or instance variable initializer expressions of that
3668 // type. It is a compile-time error for the constructors,
3669 // instance initializer blocks, or instance variable
3670 // initializer expressions of an enum constant e to refer
3671 // to itself or to an enum constant of the same type that
3672 // is declared to the right of e."
3673 if (isStaticEnumField(v)) {
3674 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3676 if (enclClass == null || enclClass.owner == null)
3677 return;
3679 // See if the enclosing class is the enum (or a
3680 // subclass thereof) declaring v. If not, this
3681 // reference is OK.
3682 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3683 return;
3685 // If the reference isn't from an initializer, then
3686 // the reference is OK.
3687 if (!Resolve.isInitializer(env))
3688 return;
3690 log.error(tree.pos(), "illegal.enum.static.ref");
3691 }
3692 }
3694 /** Is the given symbol a static, non-constant field of an Enum?
3695 * Note: enum literals should not be regarded as such
3696 */
3697 private boolean isStaticEnumField(VarSymbol v) {
3698 return Flags.isEnum(v.owner) &&
3699 Flags.isStatic(v) &&
3700 !Flags.isConstant(v) &&
3701 v.name != names._class;
3702 }
3704 /** Can the given symbol be the owner of code which forms part
3705 * if class initialization? This is the case if the symbol is
3706 * a type or field, or if the symbol is the synthetic method.
3707 * owning a block.
3708 */
3709 private boolean canOwnInitializer(Symbol sym) {
3710 return
3711 (sym.kind & (VAR | TYP)) != 0 ||
3712 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3713 }
3715 Warner noteWarner = new Warner();
3717 /**
3718 * Check that method arguments conform to its instantiation.
3719 **/
3720 public Type checkMethod(Type site,
3721 final Symbol sym,
3722 ResultInfo resultInfo,
3723 Env<AttrContext> env,
3724 final List<JCExpression> argtrees,
3725 List<Type> argtypes,
3726 List<Type> typeargtypes) {
3727 // Test (5): if symbol is an instance method of a raw type, issue
3728 // an unchecked warning if its argument types change under erasure.
3729 if (allowGenerics &&
3730 (sym.flags() & STATIC) == 0 &&
3731 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3732 Type s = types.asOuterSuper(site, sym.owner);
3733 if (s != null && s.isRaw() &&
3734 !types.isSameTypes(sym.type.getParameterTypes(),
3735 sym.erasure(types).getParameterTypes())) {
3736 chk.warnUnchecked(env.tree.pos(),
3737 "unchecked.call.mbr.of.raw.type",
3738 sym, s);
3739 }
3740 }
3742 if (env.info.defaultSuperCallSite != null) {
3743 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3744 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3745 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3746 List<MethodSymbol> icand_sup =
3747 types.interfaceCandidates(sup, (MethodSymbol)sym);
3748 if (icand_sup.nonEmpty() &&
3749 icand_sup.head != sym &&
3750 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3751 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3752 diags.fragment("overridden.default", sym, sup));
3753 break;
3754 }
3755 }
3756 env.info.defaultSuperCallSite = null;
3757 }
3759 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3760 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3761 if (app.meth.hasTag(SELECT) &&
3762 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3763 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3764 }
3765 }
3767 // Compute the identifier's instantiated type.
3768 // For methods, we need to compute the instance type by
3769 // Resolve.instantiate from the symbol's type as well as
3770 // any type arguments and value arguments.
3771 noteWarner.clear();
3772 try {
3773 Type owntype = rs.checkMethod(
3774 env,
3775 site,
3776 sym,
3777 resultInfo,
3778 argtypes,
3779 typeargtypes,
3780 noteWarner);
3782 DeferredAttr.DeferredTypeMap checkDeferredMap =
3783 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3785 argtypes = Type.map(argtypes, checkDeferredMap);
3787 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3788 chk.warnUnchecked(env.tree.pos(),
3789 "unchecked.meth.invocation.applied",
3790 kindName(sym),
3791 sym.name,
3792 rs.methodArguments(sym.type.getParameterTypes()),
3793 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3794 kindName(sym.location()),
3795 sym.location());
3796 owntype = new MethodType(owntype.getParameterTypes(),
3797 types.erasure(owntype.getReturnType()),
3798 types.erasure(owntype.getThrownTypes()),
3799 syms.methodClass);
3800 }
3802 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3803 resultInfo.checkContext.inferenceContext());
3804 } catch (Infer.InferenceException ex) {
3805 //invalid target type - propagate exception outwards or report error
3806 //depending on the current check context
3807 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3808 return types.createErrorType(site);
3809 } catch (Resolve.InapplicableMethodException ex) {
3810 final JCDiagnostic diag = ex.getDiagnostic();
3811 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3812 @Override
3813 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3814 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3815 }
3816 };
3817 List<Type> argtypes2 = Type.map(argtypes,
3818 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3819 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3820 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3821 log.report(errDiag);
3822 return types.createErrorType(site);
3823 }
3824 }
3826 public void visitLiteral(JCLiteral tree) {
3827 result = check(
3828 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3829 }
3830 //where
3831 /** Return the type of a literal with given type tag.
3832 */
3833 Type litType(TypeTag tag) {
3834 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3835 }
3837 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3838 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3839 }
3841 public void visitTypeArray(JCArrayTypeTree tree) {
3842 Type etype = attribType(tree.elemtype, env);
3843 Type type = new ArrayType(etype, syms.arrayClass);
3844 result = check(tree, type, TYP, resultInfo);
3845 }
3847 /** Visitor method for parameterized types.
3848 * Bound checking is left until later, since types are attributed
3849 * before supertype structure is completely known
3850 */
3851 public void visitTypeApply(JCTypeApply tree) {
3852 Type owntype = types.createErrorType(tree.type);
3854 // Attribute functor part of application and make sure it's a class.
3855 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3857 // Attribute type parameters
3858 List<Type> actuals = attribTypes(tree.arguments, env);
3860 if (clazztype.hasTag(CLASS)) {
3861 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3862 if (actuals.isEmpty()) //diamond
3863 actuals = formals;
3865 if (actuals.length() == formals.length()) {
3866 List<Type> a = actuals;
3867 List<Type> f = formals;
3868 while (a.nonEmpty()) {
3869 a.head = a.head.withTypeVar(f.head);
3870 a = a.tail;
3871 f = f.tail;
3872 }
3873 // Compute the proper generic outer
3874 Type clazzOuter = clazztype.getEnclosingType();
3875 if (clazzOuter.hasTag(CLASS)) {
3876 Type site;
3877 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3878 if (clazz.hasTag(IDENT)) {
3879 site = env.enclClass.sym.type;
3880 } else if (clazz.hasTag(SELECT)) {
3881 site = ((JCFieldAccess) clazz).selected.type;
3882 } else throw new AssertionError(""+tree);
3883 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3884 if (site.hasTag(CLASS))
3885 site = types.asOuterSuper(site, clazzOuter.tsym);
3886 if (site == null)
3887 site = types.erasure(clazzOuter);
3888 clazzOuter = site;
3889 }
3890 }
3891 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3892 } else {
3893 if (formals.length() != 0) {
3894 log.error(tree.pos(), "wrong.number.type.args",
3895 Integer.toString(formals.length()));
3896 } else {
3897 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3898 }
3899 owntype = types.createErrorType(tree.type);
3900 }
3901 }
3902 result = check(tree, owntype, TYP, resultInfo);
3903 }
3905 public void visitTypeUnion(JCTypeUnion tree) {
3906 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3907 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3908 for (JCExpression typeTree : tree.alternatives) {
3909 Type ctype = attribType(typeTree, env);
3910 ctype = chk.checkType(typeTree.pos(),
3911 chk.checkClassType(typeTree.pos(), ctype),
3912 syms.throwableType);
3913 if (!ctype.isErroneous()) {
3914 //check that alternatives of a union type are pairwise
3915 //unrelated w.r.t. subtyping
3916 if (chk.intersects(ctype, multicatchTypes.toList())) {
3917 for (Type t : multicatchTypes) {
3918 boolean sub = types.isSubtype(ctype, t);
3919 boolean sup = types.isSubtype(t, ctype);
3920 if (sub || sup) {
3921 //assume 'a' <: 'b'
3922 Type a = sub ? ctype : t;
3923 Type b = sub ? t : ctype;
3924 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3925 }
3926 }
3927 }
3928 multicatchTypes.append(ctype);
3929 if (all_multicatchTypes != null)
3930 all_multicatchTypes.append(ctype);
3931 } else {
3932 if (all_multicatchTypes == null) {
3933 all_multicatchTypes = new ListBuffer<>();
3934 all_multicatchTypes.appendList(multicatchTypes);
3935 }
3936 all_multicatchTypes.append(ctype);
3937 }
3938 }
3939 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3940 if (t.hasTag(CLASS)) {
3941 List<Type> alternatives =
3942 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3943 t = new UnionClassType((ClassType) t, alternatives);
3944 }
3945 tree.type = result = t;
3946 }
3948 public void visitTypeIntersection(JCTypeIntersection tree) {
3949 attribTypes(tree.bounds, env);
3950 tree.type = result = checkIntersection(tree, tree.bounds);
3951 }
3953 public void visitTypeParameter(JCTypeParameter tree) {
3954 TypeVar typeVar = (TypeVar) tree.type;
3956 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3957 annotateType(tree, tree.annotations);
3958 }
3960 if (!typeVar.bound.isErroneous()) {
3961 //fixup type-parameter bound computed in 'attribTypeVariables'
3962 typeVar.bound = checkIntersection(tree, tree.bounds);
3963 }
3964 }
3966 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3967 Set<Type> boundSet = new HashSet<Type>();
3968 if (bounds.nonEmpty()) {
3969 // accept class or interface or typevar as first bound.
3970 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3971 boundSet.add(types.erasure(bounds.head.type));
3972 if (bounds.head.type.isErroneous()) {
3973 return bounds.head.type;
3974 }
3975 else if (bounds.head.type.hasTag(TYPEVAR)) {
3976 // if first bound was a typevar, do not accept further bounds.
3977 if (bounds.tail.nonEmpty()) {
3978 log.error(bounds.tail.head.pos(),
3979 "type.var.may.not.be.followed.by.other.bounds");
3980 return bounds.head.type;
3981 }
3982 } else {
3983 // if first bound was a class or interface, accept only interfaces
3984 // as further bounds.
3985 for (JCExpression bound : bounds.tail) {
3986 bound.type = checkBase(bound.type, bound, env, false, true, false);
3987 if (bound.type.isErroneous()) {
3988 bounds = List.of(bound);
3989 }
3990 else if (bound.type.hasTag(CLASS)) {
3991 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3992 }
3993 }
3994 }
3995 }
3997 if (bounds.length() == 0) {
3998 return syms.objectType;
3999 } else if (bounds.length() == 1) {
4000 return bounds.head.type;
4001 } else {
4002 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
4003 if (tree.hasTag(TYPEINTERSECTION)) {
4004 ((IntersectionClassType)owntype).intersectionKind =
4005 IntersectionClassType.IntersectionKind.EXPLICIT;
4006 }
4007 // ... the variable's bound is a class type flagged COMPOUND
4008 // (see comment for TypeVar.bound).
4009 // In this case, generate a class tree that represents the
4010 // bound class, ...
4011 JCExpression extending;
4012 List<JCExpression> implementing;
4013 if (!bounds.head.type.isInterface()) {
4014 extending = bounds.head;
4015 implementing = bounds.tail;
4016 } else {
4017 extending = null;
4018 implementing = bounds;
4019 }
4020 JCClassDecl cd = make.at(tree).ClassDef(
4021 make.Modifiers(PUBLIC | ABSTRACT),
4022 names.empty, List.<JCTypeParameter>nil(),
4023 extending, implementing, List.<JCTree>nil());
4025 ClassSymbol c = (ClassSymbol)owntype.tsym;
4026 Assert.check((c.flags() & COMPOUND) != 0);
4027 cd.sym = c;
4028 c.sourcefile = env.toplevel.sourcefile;
4030 // ... and attribute the bound class
4031 c.flags_field |= UNATTRIBUTED;
4032 Env<AttrContext> cenv = enter.classEnv(cd, env);
4033 enter.typeEnvs.put(c, cenv);
4034 attribClass(c);
4035 return owntype;
4036 }
4037 }
4039 public void visitWildcard(JCWildcard tree) {
4040 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4041 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4042 ? syms.objectType
4043 : attribType(tree.inner, env);
4044 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4045 tree.kind.kind,
4046 syms.boundClass),
4047 TYP, resultInfo);
4048 }
4050 public void visitAnnotation(JCAnnotation tree) {
4051 Assert.error("should be handled in Annotate");
4052 }
4054 public void visitAnnotatedType(JCAnnotatedType tree) {
4055 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4056 this.attribAnnotationTypes(tree.annotations, env);
4057 annotateType(tree, tree.annotations);
4058 result = tree.type = underlyingType;
4059 }
4061 /**
4062 * Apply the annotations to the particular type.
4063 */
4064 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4065 annotate.typeAnnotation(new Annotate.Worker() {
4066 @Override
4067 public String toString() {
4068 return "annotate " + annotations + " onto " + tree;
4069 }
4070 @Override
4071 public void run() {
4072 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4073 if (annotations.size() == compounds.size()) {
4074 // All annotations were successfully converted into compounds
4075 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4076 }
4077 }
4078 });
4079 }
4081 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4082 if (annotations.isEmpty()) {
4083 return List.nil();
4084 }
4086 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4087 for (JCAnnotation anno : annotations) {
4088 if (anno.attribute != null) {
4089 // TODO: this null-check is only needed for an obscure
4090 // ordering issue, where annotate.flush is called when
4091 // the attribute is not set yet. For an example failure
4092 // try the referenceinfos/NestedTypes.java test.
4093 // Any better solutions?
4094 buf.append((Attribute.TypeCompound) anno.attribute);
4095 }
4096 // Eventually we will want to throw an exception here, but
4097 // we can't do that just yet, because it gets triggered
4098 // when attempting to attach an annotation that isn't
4099 // defined.
4100 }
4101 return buf.toList();
4102 }
4104 public void visitErroneous(JCErroneous tree) {
4105 if (tree.errs != null)
4106 for (JCTree err : tree.errs)
4107 attribTree(err, env, new ResultInfo(ERR, pt()));
4108 result = tree.type = syms.errType;
4109 }
4111 /** Default visitor method for all other trees.
4112 */
4113 public void visitTree(JCTree tree) {
4114 throw new AssertionError();
4115 }
4117 /**
4118 * Attribute an env for either a top level tree or class declaration.
4119 */
4120 public void attrib(Env<AttrContext> env) {
4121 if (env.tree.hasTag(TOPLEVEL))
4122 attribTopLevel(env);
4123 else
4124 attribClass(env.tree.pos(), env.enclClass.sym);
4125 }
4127 /**
4128 * Attribute a top level tree. These trees are encountered when the
4129 * package declaration has annotations.
4130 */
4131 public void attribTopLevel(Env<AttrContext> env) {
4132 JCCompilationUnit toplevel = env.toplevel;
4133 try {
4134 annotate.flush();
4135 } catch (CompletionFailure ex) {
4136 chk.completionError(toplevel.pos(), ex);
4137 }
4138 }
4140 /** Main method: attribute class definition associated with given class symbol.
4141 * reporting completion failures at the given position.
4142 * @param pos The source position at which completion errors are to be
4143 * reported.
4144 * @param c The class symbol whose definition will be attributed.
4145 */
4146 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4147 try {
4148 annotate.flush();
4149 attribClass(c);
4150 } catch (CompletionFailure ex) {
4151 chk.completionError(pos, ex);
4152 }
4153 }
4155 /** Attribute class definition associated with given class symbol.
4156 * @param c The class symbol whose definition will be attributed.
4157 */
4158 void attribClass(ClassSymbol c) throws CompletionFailure {
4159 if (c.type.hasTag(ERROR)) return;
4161 // Check for cycles in the inheritance graph, which can arise from
4162 // ill-formed class files.
4163 chk.checkNonCyclic(null, c.type);
4165 Type st = types.supertype(c.type);
4166 if ((c.flags_field & Flags.COMPOUND) == 0) {
4167 // First, attribute superclass.
4168 if (st.hasTag(CLASS))
4169 attribClass((ClassSymbol)st.tsym);
4171 // Next attribute owner, if it is a class.
4172 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4173 attribClass((ClassSymbol)c.owner);
4174 }
4176 // The previous operations might have attributed the current class
4177 // if there was a cycle. So we test first whether the class is still
4178 // UNATTRIBUTED.
4179 if ((c.flags_field & UNATTRIBUTED) != 0) {
4180 c.flags_field &= ~UNATTRIBUTED;
4182 // Get environment current at the point of class definition.
4183 Env<AttrContext> env = enter.typeEnvs.get(c);
4185 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4186 // because the annotations were not available at the time the env was created. Therefore,
4187 // we look up the environment chain for the first enclosing environment for which the
4188 // lint value is set. Typically, this is the parent env, but might be further if there
4189 // are any envs created as a result of TypeParameter nodes.
4190 Env<AttrContext> lintEnv = env;
4191 while (lintEnv.info.lint == null)
4192 lintEnv = lintEnv.next;
4194 // Having found the enclosing lint value, we can initialize the lint value for this class
4195 env.info.lint = lintEnv.info.lint.augment(c);
4197 Lint prevLint = chk.setLint(env.info.lint);
4198 JavaFileObject prev = log.useSource(c.sourcefile);
4199 ResultInfo prevReturnRes = env.info.returnResult;
4201 try {
4202 deferredLintHandler.flush(env.tree);
4203 env.info.returnResult = null;
4204 // java.lang.Enum may not be subclassed by a non-enum
4205 if (st.tsym == syms.enumSym &&
4206 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4207 log.error(env.tree.pos(), "enum.no.subclassing");
4209 // Enums may not be extended by source-level classes
4210 if (st.tsym != null &&
4211 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4212 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4213 log.error(env.tree.pos(), "enum.types.not.extensible");
4214 }
4215 attribClassBody(env, c);
4217 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4218 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4219 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4220 } finally {
4221 env.info.returnResult = prevReturnRes;
4222 log.useSource(prev);
4223 chk.setLint(prevLint);
4224 }
4226 }
4227 }
4229 public void visitImport(JCImport tree) {
4230 // nothing to do
4231 }
4233 /** Finish the attribution of a class. */
4234 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4235 JCClassDecl tree = (JCClassDecl)env.tree;
4236 Assert.check(c == tree.sym);
4238 // Validate type parameters, supertype and interfaces.
4239 attribStats(tree.typarams, env);
4240 if (!c.isAnonymous()) {
4241 //already checked if anonymous
4242 chk.validate(tree.typarams, env);
4243 chk.validate(tree.extending, env);
4244 chk.validate(tree.implementing, env);
4245 }
4247 // If this is a non-abstract class, check that it has no abstract
4248 // methods or unimplemented methods of an implemented interface.
4249 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4250 if (!relax)
4251 chk.checkAllDefined(tree.pos(), c);
4252 }
4254 if ((c.flags() & ANNOTATION) != 0) {
4255 if (tree.implementing.nonEmpty())
4256 log.error(tree.implementing.head.pos(),
4257 "cant.extend.intf.annotation");
4258 if (tree.typarams.nonEmpty())
4259 log.error(tree.typarams.head.pos(),
4260 "intf.annotation.cant.have.type.params");
4262 // If this annotation has a @Repeatable, validate
4263 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4264 if (repeatable != null) {
4265 // get diagnostic position for error reporting
4266 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4267 Assert.checkNonNull(cbPos);
4269 chk.validateRepeatable(c, repeatable, cbPos);
4270 }
4271 } else {
4272 // Check that all extended classes and interfaces
4273 // are compatible (i.e. no two define methods with same arguments
4274 // yet different return types). (JLS 8.4.6.3)
4275 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4276 if (allowDefaultMethods) {
4277 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4278 }
4279 }
4281 // Check that class does not import the same parameterized interface
4282 // with two different argument lists.
4283 chk.checkClassBounds(tree.pos(), c.type);
4285 tree.type = c.type;
4287 for (List<JCTypeParameter> l = tree.typarams;
4288 l.nonEmpty(); l = l.tail) {
4289 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4290 }
4292 // Check that a generic class doesn't extend Throwable
4293 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4294 log.error(tree.extending.pos(), "generic.throwable");
4296 // Check that all methods which implement some
4297 // method conform to the method they implement.
4298 chk.checkImplementations(tree);
4300 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4301 checkAutoCloseable(tree.pos(), env, c.type);
4303 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4304 // Attribute declaration
4305 attribStat(l.head, env);
4306 // Check that declarations in inner classes are not static (JLS 8.1.2)
4307 // Make an exception for static constants.
4308 if (c.owner.kind != PCK &&
4309 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4310 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4311 Symbol sym = null;
4312 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4313 if (sym == null ||
4314 sym.kind != VAR ||
4315 ((VarSymbol) sym).getConstValue() == null)
4316 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4317 }
4318 }
4320 // Check for cycles among non-initial constructors.
4321 chk.checkCyclicConstructors(tree);
4323 // Check for cycles among annotation elements.
4324 chk.checkNonCyclicElements(tree);
4326 // Check for proper use of serialVersionUID
4327 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4328 isSerializable(c) &&
4329 (c.flags() & Flags.ENUM) == 0 &&
4330 checkForSerial(c)) {
4331 checkSerialVersionUID(tree, c);
4332 }
4333 if (allowTypeAnnos) {
4334 // Correctly organize the postions of the type annotations
4335 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4337 // Check type annotations applicability rules
4338 validateTypeAnnotations(tree, false);
4339 }
4340 }
4341 // where
4342 boolean checkForSerial(ClassSymbol c) {
4343 if ((c.flags() & ABSTRACT) == 0) {
4344 return true;
4345 } else {
4346 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4347 }
4348 }
4350 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4351 @Override
4352 public boolean accepts(Symbol s) {
4353 return s.kind == Kinds.MTH &&
4354 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4355 }
4356 };
4358 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4359 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4360 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4361 if (types.isSameType(al.head.annotationType.type, t))
4362 return al.head.pos();
4363 }
4365 return null;
4366 }
4368 /** check if a class is a subtype of Serializable, if that is available. */
4369 private boolean isSerializable(ClassSymbol c) {
4370 try {
4371 syms.serializableType.complete();
4372 }
4373 catch (CompletionFailure e) {
4374 return false;
4375 }
4376 return types.isSubtype(c.type, syms.serializableType);
4377 }
4379 /** Check that an appropriate serialVersionUID member is defined. */
4380 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4382 // check for presence of serialVersionUID
4383 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4384 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4385 if (e.scope == null) {
4386 log.warning(LintCategory.SERIAL,
4387 tree.pos(), "missing.SVUID", c);
4388 return;
4389 }
4391 // check that it is static final
4392 VarSymbol svuid = (VarSymbol)e.sym;
4393 if ((svuid.flags() & (STATIC | FINAL)) !=
4394 (STATIC | FINAL))
4395 log.warning(LintCategory.SERIAL,
4396 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4398 // check that it is long
4399 else if (!svuid.type.hasTag(LONG))
4400 log.warning(LintCategory.SERIAL,
4401 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4403 // check constant
4404 else if (svuid.getConstValue() == null)
4405 log.warning(LintCategory.SERIAL,
4406 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4407 }
4409 private Type capture(Type type) {
4410 return types.capture(type);
4411 }
4413 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4414 tree.accept(new TypeAnnotationsValidator(sigOnly));
4415 }
4416 //where
4417 private final class TypeAnnotationsValidator extends TreeScanner {
4419 private final boolean sigOnly;
4420 public TypeAnnotationsValidator(boolean sigOnly) {
4421 this.sigOnly = sigOnly;
4422 }
4424 public void visitAnnotation(JCAnnotation tree) {
4425 chk.validateTypeAnnotation(tree, false);
4426 super.visitAnnotation(tree);
4427 }
4428 public void visitAnnotatedType(JCAnnotatedType tree) {
4429 if (!tree.underlyingType.type.isErroneous()) {
4430 super.visitAnnotatedType(tree);
4431 }
4432 }
4433 public void visitTypeParameter(JCTypeParameter tree) {
4434 chk.validateTypeAnnotations(tree.annotations, true);
4435 scan(tree.bounds);
4436 // Don't call super.
4437 // This is needed because above we call validateTypeAnnotation with
4438 // false, which would forbid annotations on type parameters.
4439 // super.visitTypeParameter(tree);
4440 }
4441 public void visitMethodDef(JCMethodDecl tree) {
4442 if (tree.recvparam != null &&
4443 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4444 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4445 tree.recvparam.vartype.type.tsym);
4446 }
4447 if (tree.restype != null && tree.restype.type != null) {
4448 validateAnnotatedType(tree.restype, tree.restype.type);
4449 }
4450 if (sigOnly) {
4451 scan(tree.mods);
4452 scan(tree.restype);
4453 scan(tree.typarams);
4454 scan(tree.recvparam);
4455 scan(tree.params);
4456 scan(tree.thrown);
4457 } else {
4458 scan(tree.defaultValue);
4459 scan(tree.body);
4460 }
4461 }
4462 public void visitVarDef(final JCVariableDecl tree) {
4463 if (tree.sym != null && tree.sym.type != null)
4464 validateAnnotatedType(tree.vartype, tree.sym.type);
4465 scan(tree.mods);
4466 scan(tree.vartype);
4467 if (!sigOnly) {
4468 scan(tree.init);
4469 }
4470 }
4471 public void visitTypeCast(JCTypeCast tree) {
4472 if (tree.clazz != null && tree.clazz.type != null)
4473 validateAnnotatedType(tree.clazz, tree.clazz.type);
4474 super.visitTypeCast(tree);
4475 }
4476 public void visitTypeTest(JCInstanceOf tree) {
4477 if (tree.clazz != null && tree.clazz.type != null)
4478 validateAnnotatedType(tree.clazz, tree.clazz.type);
4479 super.visitTypeTest(tree);
4480 }
4481 public void visitNewClass(JCNewClass tree) {
4482 if (tree.clazz.type != null)
4483 validateAnnotatedType(tree.clazz, tree.clazz.type);
4484 super.visitNewClass(tree);
4485 }
4486 public void visitNewArray(JCNewArray tree) {
4487 if (tree.elemtype != null && tree.elemtype.type != null)
4488 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4489 super.visitNewArray(tree);
4490 }
4492 @Override
4493 public void visitClassDef(JCClassDecl tree) {
4494 if (sigOnly) {
4495 scan(tree.mods);
4496 scan(tree.typarams);
4497 scan(tree.extending);
4498 scan(tree.implementing);
4499 }
4500 for (JCTree member : tree.defs) {
4501 if (member.hasTag(Tag.CLASSDEF)) {
4502 continue;
4503 }
4504 scan(member);
4505 }
4506 }
4508 @Override
4509 public void visitBlock(JCBlock tree) {
4510 if (!sigOnly) {
4511 scan(tree.stats);
4512 }
4513 }
4515 /* I would want to model this after
4516 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4517 * and override visitSelect and visitTypeApply.
4518 * However, we only set the annotated type in the top-level type
4519 * of the symbol.
4520 * Therefore, we need to override each individual location where a type
4521 * can occur.
4522 */
4523 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4524 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4526 if (type.isPrimitiveOrVoid()) {
4527 return;
4528 }
4530 JCTree enclTr = errtree;
4531 Type enclTy = type;
4533 boolean repeat = true;
4534 while (repeat) {
4535 if (enclTr.hasTag(TYPEAPPLY)) {
4536 List<Type> tyargs = enclTy.getTypeArguments();
4537 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4538 if (trargs.length() > 0) {
4539 // Nothing to do for diamonds
4540 if (tyargs.length() == trargs.length()) {
4541 for (int i = 0; i < tyargs.length(); ++i) {
4542 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4543 }
4544 }
4545 // If the lengths don't match, it's either a diamond
4546 // or some nested type that redundantly provides
4547 // type arguments in the tree.
4548 }
4550 // Look at the clazz part of a generic type
4551 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4552 }
4554 if (enclTr.hasTag(SELECT)) {
4555 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4556 if (enclTy != null &&
4557 !enclTy.hasTag(NONE)) {
4558 enclTy = enclTy.getEnclosingType();
4559 }
4560 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4561 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4562 if (enclTy == null ||
4563 enclTy.hasTag(NONE)) {
4564 if (at.getAnnotations().size() == 1) {
4565 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4566 } else {
4567 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4568 for (JCAnnotation an : at.getAnnotations()) {
4569 comps.add(an.attribute);
4570 }
4571 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4572 }
4573 repeat = false;
4574 }
4575 enclTr = at.underlyingType;
4576 // enclTy doesn't need to be changed
4577 } else if (enclTr.hasTag(IDENT)) {
4578 repeat = false;
4579 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4580 JCWildcard wc = (JCWildcard) enclTr;
4581 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4582 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4583 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4584 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4585 } else {
4586 // Nothing to do for UNBOUND
4587 }
4588 repeat = false;
4589 } else if (enclTr.hasTag(TYPEARRAY)) {
4590 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4591 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4592 repeat = false;
4593 } else if (enclTr.hasTag(TYPEUNION)) {
4594 JCTypeUnion ut = (JCTypeUnion) enclTr;
4595 for (JCTree t : ut.getTypeAlternatives()) {
4596 validateAnnotatedType(t, t.type);
4597 }
4598 repeat = false;
4599 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4600 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4601 for (JCTree t : it.getBounds()) {
4602 validateAnnotatedType(t, t.type);
4603 }
4604 repeat = false;
4605 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE) {
4606 // This happens in test TargetTypeTest52.java
4607 // Is there anything to do?
4608 repeat = false;
4609 } else {
4610 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4611 " within: "+ errtree + " with kind: " + errtree.getKind());
4612 }
4613 }
4614 }
4615 };
4617 // <editor-fold desc="post-attribution visitor">
4619 /**
4620 * Handle missing types/symbols in an AST. This routine is useful when
4621 * the compiler has encountered some errors (which might have ended up
4622 * terminating attribution abruptly); if the compiler is used in fail-over
4623 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4624 * prevents NPE to be progagated during subsequent compilation steps.
4625 */
4626 public void postAttr(JCTree tree) {
4627 new PostAttrAnalyzer().scan(tree);
4628 }
4630 class PostAttrAnalyzer extends TreeScanner {
4632 private void initTypeIfNeeded(JCTree that) {
4633 if (that.type == null) {
4634 that.type = syms.unknownType;
4635 }
4636 }
4638 @Override
4639 public void scan(JCTree tree) {
4640 if (tree == null) return;
4641 if (tree instanceof JCExpression) {
4642 initTypeIfNeeded(tree);
4643 }
4644 super.scan(tree);
4645 }
4647 @Override
4648 public void visitIdent(JCIdent that) {
4649 if (that.sym == null) {
4650 that.sym = syms.unknownSymbol;
4651 }
4652 }
4654 @Override
4655 public void visitSelect(JCFieldAccess that) {
4656 if (that.sym == null) {
4657 that.sym = syms.unknownSymbol;
4658 }
4659 super.visitSelect(that);
4660 }
4662 @Override
4663 public void visitClassDef(JCClassDecl that) {
4664 initTypeIfNeeded(that);
4665 if (that.sym == null) {
4666 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4667 }
4668 super.visitClassDef(that);
4669 }
4671 @Override
4672 public void visitMethodDef(JCMethodDecl that) {
4673 initTypeIfNeeded(that);
4674 if (that.sym == null) {
4675 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4676 }
4677 super.visitMethodDef(that);
4678 }
4680 @Override
4681 public void visitVarDef(JCVariableDecl that) {
4682 initTypeIfNeeded(that);
4683 if (that.sym == null) {
4684 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4685 that.sym.adr = 0;
4686 }
4687 super.visitVarDef(that);
4688 }
4690 @Override
4691 public void visitNewClass(JCNewClass that) {
4692 if (that.constructor == null) {
4693 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4694 }
4695 if (that.constructorType == null) {
4696 that.constructorType = syms.unknownType;
4697 }
4698 super.visitNewClass(that);
4699 }
4701 @Override
4702 public void visitAssignop(JCAssignOp that) {
4703 if (that.operator == null)
4704 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4705 super.visitAssignop(that);
4706 }
4708 @Override
4709 public void visitBinary(JCBinary that) {
4710 if (that.operator == null)
4711 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4712 super.visitBinary(that);
4713 }
4715 @Override
4716 public void visitUnary(JCUnary that) {
4717 if (that.operator == null)
4718 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4719 super.visitUnary(that);
4720 }
4722 @Override
4723 public void visitLambda(JCLambda that) {
4724 super.visitLambda(that);
4725 if (that.targets == null) {
4726 that.targets = List.nil();
4727 }
4728 }
4730 @Override
4731 public void visitReference(JCMemberReference that) {
4732 super.visitReference(that);
4733 if (that.sym == null) {
4734 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4735 }
4736 if (that.targets == null) {
4737 that.targets = List.nil();
4738 }
4739 }
4740 }
4741 // </editor-fold>
4742 }
