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src/share/classes/com/sun/tools/javac/comp/Attr.java@f218bb5ebd53
src/share/classes/com/sun/tools/javac/comp/Attr.java
Thu, 06 Jun 2013 15:37:23 +0100
- author
- mcimadamore
- date
- Thu, 06 Jun 2013 15:37:23 +0100
- changeset 1813
- f218bb5ebd53
- parent 1812
- f8472e561a97
- child 1820
- 6b48ebae2569
- permissions
- -rw-r--r--
8015648: Duplicate variable in lambda causes javac crash
Summary: Missing flag in synthetic lambda blog is causing duplicates symbol to go undetected
Reviewed-by: jjg, 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 DeferredLintHandler deferredLintHandler;
98 public static Attr instance(Context context) {
99 Attr instance = context.get(attrKey);
100 if (instance == null)
101 instance = new Attr(context);
102 return instance;
103 }
105 protected Attr(Context context) {
106 context.put(attrKey, this);
108 names = Names.instance(context);
109 log = Log.instance(context);
110 syms = Symtab.instance(context);
111 rs = Resolve.instance(context);
112 chk = Check.instance(context);
113 flow = Flow.instance(context);
114 memberEnter = MemberEnter.instance(context);
115 make = TreeMaker.instance(context);
116 enter = Enter.instance(context);
117 infer = Infer.instance(context);
118 deferredAttr = DeferredAttr.instance(context);
119 cfolder = ConstFold.instance(context);
120 target = Target.instance(context);
121 types = Types.instance(context);
122 diags = JCDiagnostic.Factory.instance(context);
123 annotate = Annotate.instance(context);
124 deferredLintHandler = DeferredLintHandler.instance(context);
126 Options options = Options.instance(context);
128 Source source = Source.instance(context);
129 allowGenerics = source.allowGenerics();
130 allowVarargs = source.allowVarargs();
131 allowEnums = source.allowEnums();
132 allowBoxing = source.allowBoxing();
133 allowCovariantReturns = source.allowCovariantReturns();
134 allowAnonOuterThis = source.allowAnonOuterThis();
135 allowStringsInSwitch = source.allowStringsInSwitch();
136 allowPoly = source.allowPoly();
137 allowLambda = source.allowLambda();
138 allowDefaultMethods = source.allowDefaultMethods();
139 sourceName = source.name;
140 relax = (options.isSet("-retrofit") ||
141 options.isSet("-relax"));
142 findDiamonds = options.get("findDiamond") != null &&
143 source.allowDiamond();
144 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
145 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
147 statInfo = new ResultInfo(NIL, Type.noType);
148 varInfo = new ResultInfo(VAR, Type.noType);
149 unknownExprInfo = new ResultInfo(VAL, Type.noType);
150 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
151 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
152 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
153 }
155 /** Switch: relax some constraints for retrofit mode.
156 */
157 boolean relax;
159 /** Switch: support target-typing inference
160 */
161 boolean allowPoly;
163 /** Switch: support generics?
164 */
165 boolean allowGenerics;
167 /** Switch: allow variable-arity methods.
168 */
169 boolean allowVarargs;
171 /** Switch: support enums?
172 */
173 boolean allowEnums;
175 /** Switch: support boxing and unboxing?
176 */
177 boolean allowBoxing;
179 /** Switch: support covariant result types?
180 */
181 boolean allowCovariantReturns;
183 /** Switch: support lambda expressions ?
184 */
185 boolean allowLambda;
187 /** Switch: support default methods ?
188 */
189 boolean allowDefaultMethods;
191 /** Switch: allow references to surrounding object from anonymous
192 * objects during constructor call?
193 */
194 boolean allowAnonOuterThis;
196 /** Switch: generates a warning if diamond can be safely applied
197 * to a given new expression
198 */
199 boolean findDiamonds;
201 /**
202 * Internally enables/disables diamond finder feature
203 */
204 static final boolean allowDiamondFinder = true;
206 /**
207 * Switch: warn about use of variable before declaration?
208 * RFE: 6425594
209 */
210 boolean useBeforeDeclarationWarning;
212 /**
213 * Switch: generate warnings whenever an anonymous inner class that is convertible
214 * to a lambda expression is found
215 */
216 boolean identifyLambdaCandidate;
218 /**
219 * Switch: allow strings in switch?
220 */
221 boolean allowStringsInSwitch;
223 /**
224 * Switch: name of source level; used for error reporting.
225 */
226 String sourceName;
228 /** Check kind and type of given tree against protokind and prototype.
229 * If check succeeds, store type in tree and return it.
230 * If check fails, store errType in tree and return it.
231 * No checks are performed if the prototype is a method type.
232 * It is not necessary in this case since we know that kind and type
233 * are correct.
234 *
235 * @param tree The tree whose kind and type is checked
236 * @param ownkind The computed kind of the tree
237 * @param resultInfo The expected result of the tree
238 */
239 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
240 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
241 Type owntype = found;
242 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
243 if (inferenceContext.free(found)) {
244 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
245 @Override
246 public void typesInferred(InferenceContext inferenceContext) {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 }
251 });
252 return tree.type = resultInfo.pt;
253 } else {
254 if ((ownkind & ~resultInfo.pkind) == 0) {
255 owntype = resultInfo.check(tree, owntype);
256 } else {
257 log.error(tree.pos(), "unexpected.type",
258 kindNames(resultInfo.pkind),
259 kindName(ownkind));
260 owntype = types.createErrorType(owntype);
261 }
262 }
263 }
264 tree.type = owntype;
265 return owntype;
266 }
268 /** Is given blank final variable assignable, i.e. in a scope where it
269 * may be assigned to even though it is final?
270 * @param v The blank final variable.
271 * @param env The current environment.
272 */
273 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
274 Symbol owner = owner(env);
275 // owner refers to the innermost variable, method or
276 // initializer block declaration at this point.
277 return
278 v.owner == owner
279 ||
280 ((owner.name == names.init || // i.e. we are in a constructor
281 owner.kind == VAR || // i.e. we are in a variable initializer
282 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
283 &&
284 v.owner == owner.owner
285 &&
286 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
287 }
289 /**
290 * Return the innermost enclosing owner symbol in a given attribution context
291 */
292 Symbol owner(Env<AttrContext> env) {
293 while (true) {
294 switch (env.tree.getTag()) {
295 case VARDEF:
296 //a field can be owner
297 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
298 if (vsym.owner.kind == TYP) {
299 return vsym;
300 }
301 break;
302 case METHODDEF:
303 //method def is always an owner
304 return ((JCMethodDecl)env.tree).sym;
305 case CLASSDEF:
306 //class def is always an owner
307 return ((JCClassDecl)env.tree).sym;
308 case LAMBDA:
309 //a lambda is an owner - return a fresh synthetic method symbol
310 return new MethodSymbol(0, names.empty, null, syms.methodClass);
311 case BLOCK:
312 //static/instance init blocks are owner
313 Symbol blockSym = env.info.scope.owner;
314 if ((blockSym.flags() & BLOCK) != 0) {
315 return blockSym;
316 }
317 break;
318 case TOPLEVEL:
319 //toplevel is always an owner (for pkge decls)
320 return env.info.scope.owner;
321 }
322 Assert.checkNonNull(env.next);
323 env = env.next;
324 }
325 }
327 /** Check that variable can be assigned to.
328 * @param pos The current source code position.
329 * @param v The assigned varaible
330 * @param base If the variable is referred to in a Select, the part
331 * to the left of the `.', null otherwise.
332 * @param env The current environment.
333 */
334 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
335 if ((v.flags() & FINAL) != 0 &&
336 ((v.flags() & HASINIT) != 0
337 ||
338 !((base == null ||
339 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
340 isAssignableAsBlankFinal(v, env)))) {
341 if (v.isResourceVariable()) { //TWR resource
342 log.error(pos, "try.resource.may.not.be.assigned", v);
343 } else {
344 log.error(pos, "cant.assign.val.to.final.var", v);
345 }
346 }
347 }
349 /** Does tree represent a static reference to an identifier?
350 * It is assumed that tree is either a SELECT or an IDENT.
351 * We have to weed out selects from non-type names here.
352 * @param tree The candidate tree.
353 */
354 boolean isStaticReference(JCTree tree) {
355 if (tree.hasTag(SELECT)) {
356 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
357 if (lsym == null || lsym.kind != TYP) {
358 return false;
359 }
360 }
361 return true;
362 }
364 /** Is this symbol a type?
365 */
366 static boolean isType(Symbol sym) {
367 return sym != null && sym.kind == TYP;
368 }
370 /** The current `this' symbol.
371 * @param env The current environment.
372 */
373 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
374 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
375 }
377 /** Attribute a parsed identifier.
378 * @param tree Parsed identifier name
379 * @param topLevel The toplevel to use
380 */
381 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
382 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
383 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
384 syms.errSymbol.name,
385 null, null, null, null);
386 localEnv.enclClass.sym = syms.errSymbol;
387 return tree.accept(identAttributer, localEnv);
388 }
389 // where
390 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
391 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
392 @Override
393 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
394 Symbol site = visit(node.getExpression(), env);
395 if (site.kind == ERR)
396 return site;
397 Name name = (Name)node.getIdentifier();
398 if (site.kind == PCK) {
399 env.toplevel.packge = (PackageSymbol)site;
400 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
401 } else {
402 env.enclClass.sym = (ClassSymbol)site;
403 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
404 }
405 }
407 @Override
408 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
409 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
410 }
411 }
413 public Type coerce(Type etype, Type ttype) {
414 return cfolder.coerce(etype, ttype);
415 }
417 public Type attribType(JCTree node, TypeSymbol sym) {
418 Env<AttrContext> env = enter.typeEnvs.get(sym);
419 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
420 return attribTree(node, localEnv, unknownTypeInfo);
421 }
423 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
424 // Attribute qualifying package or class.
425 JCFieldAccess s = (JCFieldAccess)tree.qualid;
426 return attribTree(s.selected,
427 env,
428 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
429 Type.noType));
430 }
432 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
433 breakTree = tree;
434 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
435 try {
436 attribExpr(expr, env);
437 } catch (BreakAttr b) {
438 return b.env;
439 } catch (AssertionError ae) {
440 if (ae.getCause() instanceof BreakAttr) {
441 return ((BreakAttr)(ae.getCause())).env;
442 } else {
443 throw ae;
444 }
445 } finally {
446 breakTree = null;
447 log.useSource(prev);
448 }
449 return env;
450 }
452 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
453 breakTree = tree;
454 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
455 try {
456 attribStat(stmt, env);
457 } catch (BreakAttr b) {
458 return b.env;
459 } catch (AssertionError ae) {
460 if (ae.getCause() instanceof BreakAttr) {
461 return ((BreakAttr)(ae.getCause())).env;
462 } else {
463 throw ae;
464 }
465 } finally {
466 breakTree = null;
467 log.useSource(prev);
468 }
469 return env;
470 }
472 private JCTree breakTree = null;
474 private static class BreakAttr extends RuntimeException {
475 static final long serialVersionUID = -6924771130405446405L;
476 private Env<AttrContext> env;
477 private BreakAttr(Env<AttrContext> env) {
478 this.env = copyEnv(env);
479 }
481 private Env<AttrContext> copyEnv(Env<AttrContext> env) {
482 Env<AttrContext> newEnv =
483 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
484 if (newEnv.outer != null) {
485 newEnv.outer = copyEnv(newEnv.outer);
486 }
487 return newEnv;
488 }
490 private Scope copyScope(Scope sc) {
491 Scope newScope = new Scope(sc.owner);
492 List<Symbol> elemsList = List.nil();
493 while (sc != null) {
494 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
495 elemsList = elemsList.prepend(e.sym);
496 }
497 sc = sc.next;
498 }
499 for (Symbol s : elemsList) {
500 newScope.enter(s);
501 }
502 return newScope;
503 }
504 }
506 class ResultInfo {
507 final int pkind;
508 final Type pt;
509 final CheckContext checkContext;
511 ResultInfo(int pkind, Type pt) {
512 this(pkind, pt, chk.basicHandler);
513 }
515 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
516 this.pkind = pkind;
517 this.pt = pt;
518 this.checkContext = checkContext;
519 }
521 protected Type check(final DiagnosticPosition pos, final Type found) {
522 return chk.checkType(pos, found, pt, checkContext);
523 }
525 protected ResultInfo dup(Type newPt) {
526 return new ResultInfo(pkind, newPt, checkContext);
527 }
529 protected ResultInfo dup(CheckContext newContext) {
530 return new ResultInfo(pkind, pt, newContext);
531 }
532 }
534 class RecoveryInfo extends ResultInfo {
536 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
537 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
538 @Override
539 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
540 return deferredAttrContext;
541 }
542 @Override
543 public boolean compatible(Type found, Type req, Warner warn) {
544 return true;
545 }
546 @Override
547 public void report(DiagnosticPosition pos, JCDiagnostic details) {
548 chk.basicHandler.report(pos, details);
549 }
550 });
551 }
553 @Override
554 protected Type check(DiagnosticPosition pos, Type found) {
555 return chk.checkNonVoid(pos, super.check(pos, found));
556 }
557 }
559 final ResultInfo statInfo;
560 final ResultInfo varInfo;
561 final ResultInfo unknownExprInfo;
562 final ResultInfo unknownTypeInfo;
563 final ResultInfo unknownTypeExprInfo;
564 final ResultInfo recoveryInfo;
566 Type pt() {
567 return resultInfo.pt;
568 }
570 int pkind() {
571 return resultInfo.pkind;
572 }
574 /* ************************************************************************
575 * Visitor methods
576 *************************************************************************/
578 /** Visitor argument: the current environment.
579 */
580 Env<AttrContext> env;
582 /** Visitor argument: the currently expected attribution result.
583 */
584 ResultInfo resultInfo;
586 /** Visitor result: the computed type.
587 */
588 Type result;
590 /** Visitor method: attribute a tree, catching any completion failure
591 * exceptions. Return the tree's type.
592 *
593 * @param tree The tree to be visited.
594 * @param env The environment visitor argument.
595 * @param resultInfo The result info visitor argument.
596 */
597 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
598 Env<AttrContext> prevEnv = this.env;
599 ResultInfo prevResult = this.resultInfo;
600 try {
601 this.env = env;
602 this.resultInfo = resultInfo;
603 tree.accept(this);
604 if (tree == breakTree &&
605 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
606 throw new BreakAttr(env);
607 }
608 return result;
609 } catch (CompletionFailure ex) {
610 tree.type = syms.errType;
611 return chk.completionError(tree.pos(), ex);
612 } finally {
613 this.env = prevEnv;
614 this.resultInfo = prevResult;
615 }
616 }
618 /** Derived visitor method: attribute an expression tree.
619 */
620 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
621 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
622 }
624 /** Derived visitor method: attribute an expression tree with
625 * no constraints on the computed type.
626 */
627 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
628 return attribTree(tree, env, unknownExprInfo);
629 }
631 /** Derived visitor method: attribute a type tree.
632 */
633 public Type attribType(JCTree tree, Env<AttrContext> env) {
634 Type result = attribType(tree, env, Type.noType);
635 return result;
636 }
638 /** Derived visitor method: attribute a type tree.
639 */
640 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
641 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
642 return result;
643 }
645 /** Derived visitor method: attribute a statement or definition tree.
646 */
647 public Type attribStat(JCTree tree, Env<AttrContext> env) {
648 return attribTree(tree, env, statInfo);
649 }
651 /** Attribute a list of expressions, returning a list of types.
652 */
653 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
654 ListBuffer<Type> ts = new ListBuffer<Type>();
655 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
656 ts.append(attribExpr(l.head, env, pt));
657 return ts.toList();
658 }
660 /** Attribute a list of statements, returning nothing.
661 */
662 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
663 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
664 attribStat(l.head, env);
665 }
667 /** Attribute the arguments in a method call, returning a list of types.
668 */
669 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
670 ListBuffer<Type> argtypes = new ListBuffer<Type>();
671 for (JCExpression arg : trees) {
672 Type argtype = allowPoly && deferredAttr.isDeferred(env, arg) ?
673 deferredAttr.new DeferredType(arg, env) :
674 chk.checkNonVoid(arg, attribExpr(arg, env, Infer.anyPoly));
675 argtypes.append(argtype);
676 }
677 return argtypes.toList();
678 }
680 /** Attribute a type argument list, returning a list of types.
681 * Caller is responsible for calling checkRefTypes.
682 */
683 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
684 ListBuffer<Type> argtypes = new ListBuffer<Type>();
685 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
686 argtypes.append(attribType(l.head, env));
687 return argtypes.toList();
688 }
690 /** Attribute a type argument list, returning a list of types.
691 * Check that all the types are references.
692 */
693 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
694 List<Type> types = attribAnyTypes(trees, env);
695 return chk.checkRefTypes(trees, types);
696 }
698 /**
699 * Attribute type variables (of generic classes or methods).
700 * Compound types are attributed later in attribBounds.
701 * @param typarams the type variables to enter
702 * @param env the current environment
703 */
704 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
705 for (JCTypeParameter tvar : typarams) {
706 TypeVar a = (TypeVar)tvar.type;
707 a.tsym.flags_field |= UNATTRIBUTED;
708 a.bound = Type.noType;
709 if (!tvar.bounds.isEmpty()) {
710 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
711 for (JCExpression bound : tvar.bounds.tail)
712 bounds = bounds.prepend(attribType(bound, env));
713 types.setBounds(a, bounds.reverse());
714 } else {
715 // if no bounds are given, assume a single bound of
716 // java.lang.Object.
717 types.setBounds(a, List.of(syms.objectType));
718 }
719 a.tsym.flags_field &= ~UNATTRIBUTED;
720 }
721 for (JCTypeParameter tvar : typarams) {
722 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
723 }
724 }
726 /**
727 * Attribute the type references in a list of annotations.
728 */
729 void attribAnnotationTypes(List<JCAnnotation> annotations,
730 Env<AttrContext> env) {
731 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
732 JCAnnotation a = al.head;
733 attribType(a.annotationType, env);
734 }
735 }
737 /**
738 * Attribute a "lazy constant value".
739 * @param env The env for the const value
740 * @param initializer The initializer for the const value
741 * @param type The expected type, or null
742 * @see VarSymbol#setLazyConstValue
743 */
744 public Object attribLazyConstantValue(Env<AttrContext> env,
745 JCTree.JCExpression initializer,
746 Type type) {
748 // in case no lint value has been set up for this env, scan up
749 // env stack looking for smallest enclosing env for which it is set.
750 Env<AttrContext> lintEnv = env;
751 while (lintEnv.info.lint == null)
752 lintEnv = lintEnv.next;
754 // Having found the enclosing lint value, we can initialize the lint value for this class
755 // ... but ...
756 // There's a problem with evaluating annotations in the right order, such that
757 // env.info.enclVar.attributes_field might not yet have been evaluated, and so might be
758 // null. In that case, calling augment will throw an NPE. To avoid this, for now we
759 // revert to the jdk 6 behavior and ignore the (unevaluated) attributes.
760 if (env.info.enclVar.annotationsPendingCompletion()) {
761 env.info.lint = lintEnv.info.lint;
762 } else {
763 env.info.lint = lintEnv.info.lint.augment(env.info.enclVar);
764 }
766 Lint prevLint = chk.setLint(env.info.lint);
767 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
769 try {
770 // Use null as symbol to not attach the type annotation to any symbol.
771 // The initializer will later also be visited and then we'll attach
772 // to the symbol.
773 // This prevents having multiple type annotations, just because of
774 // lazy constant value evaluation.
775 memberEnter.typeAnnotate(initializer, env, null);
776 annotate.flush();
777 Type itype = attribExpr(initializer, env, type);
778 if (itype.constValue() != null)
779 return coerce(itype, type).constValue();
780 else
781 return null;
782 } finally {
783 env.info.lint = prevLint;
784 log.useSource(prevSource);
785 }
786 }
788 /** Attribute type reference in an `extends' or `implements' clause.
789 * Supertypes of anonymous inner classes are usually already attributed.
790 *
791 * @param tree The tree making up the type reference.
792 * @param env The environment current at the reference.
793 * @param classExpected true if only a class is expected here.
794 * @param interfaceExpected true if only an interface is expected here.
795 */
796 Type attribBase(JCTree tree,
797 Env<AttrContext> env,
798 boolean classExpected,
799 boolean interfaceExpected,
800 boolean checkExtensible) {
801 Type t = tree.type != null ?
802 tree.type :
803 attribType(tree, env);
804 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
805 }
806 Type checkBase(Type t,
807 JCTree tree,
808 Env<AttrContext> env,
809 boolean classExpected,
810 boolean interfaceExpected,
811 boolean checkExtensible) {
812 if (t.isErroneous())
813 return t;
814 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
815 // check that type variable is already visible
816 if (t.getUpperBound() == null) {
817 log.error(tree.pos(), "illegal.forward.ref");
818 return types.createErrorType(t);
819 }
820 } else {
821 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
822 }
823 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
824 log.error(tree.pos(), "intf.expected.here");
825 // return errType is necessary since otherwise there might
826 // be undetected cycles which cause attribution to loop
827 return types.createErrorType(t);
828 } else if (checkExtensible &&
829 classExpected &&
830 (t.tsym.flags() & INTERFACE) != 0) {
831 log.error(tree.pos(), "no.intf.expected.here");
832 return types.createErrorType(t);
833 }
834 if (checkExtensible &&
835 ((t.tsym.flags() & FINAL) != 0)) {
836 log.error(tree.pos(),
837 "cant.inherit.from.final", t.tsym);
838 }
839 chk.checkNonCyclic(tree.pos(), t);
840 return t;
841 }
843 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
844 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
845 id.type = env.info.scope.owner.type;
846 id.sym = env.info.scope.owner;
847 return id.type;
848 }
850 public void visitClassDef(JCClassDecl tree) {
851 // Local classes have not been entered yet, so we need to do it now:
852 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
853 enter.classEnter(tree, env);
855 ClassSymbol c = tree.sym;
856 if (c == null) {
857 // exit in case something drastic went wrong during enter.
858 result = null;
859 } else {
860 // make sure class has been completed:
861 c.complete();
863 // If this class appears as an anonymous class
864 // in a superclass constructor call where
865 // no explicit outer instance is given,
866 // disable implicit outer instance from being passed.
867 // (This would be an illegal access to "this before super").
868 if (env.info.isSelfCall &&
869 env.tree.hasTag(NEWCLASS) &&
870 ((JCNewClass) env.tree).encl == null)
871 {
872 c.flags_field |= NOOUTERTHIS;
873 }
874 attribClass(tree.pos(), c);
875 result = tree.type = c.type;
876 }
877 }
879 public void visitMethodDef(JCMethodDecl tree) {
880 MethodSymbol m = tree.sym;
881 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
883 Lint lint = env.info.lint.augment(m);
884 Lint prevLint = chk.setLint(lint);
885 MethodSymbol prevMethod = chk.setMethod(m);
886 try {
887 deferredLintHandler.flush(tree.pos());
888 chk.checkDeprecatedAnnotation(tree.pos(), m);
891 // Create a new environment with local scope
892 // for attributing the method.
893 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
894 localEnv.info.lint = lint;
896 attribStats(tree.typarams, localEnv);
898 // If we override any other methods, check that we do so properly.
899 // JLS ???
900 if (m.isStatic()) {
901 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
902 } else {
903 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
904 }
905 chk.checkOverride(tree, m);
907 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
908 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
909 }
911 // Enter all type parameters into the local method scope.
912 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
913 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
915 ClassSymbol owner = env.enclClass.sym;
916 if ((owner.flags() & ANNOTATION) != 0 &&
917 tree.params.nonEmpty())
918 log.error(tree.params.head.pos(),
919 "intf.annotation.members.cant.have.params");
921 // Attribute all value parameters.
922 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
923 attribStat(l.head, localEnv);
924 }
926 chk.checkVarargsMethodDecl(localEnv, tree);
928 // Check that type parameters are well-formed.
929 chk.validate(tree.typarams, localEnv);
931 // Check that result type is well-formed.
932 chk.validate(tree.restype, localEnv);
934 // Check that receiver type is well-formed.
935 if (tree.recvparam != null) {
936 // Use a new environment to check the receiver parameter.
937 // Otherwise I get "might not have been initialized" errors.
938 // Is there a better way?
939 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
940 attribType(tree.recvparam, newEnv);
941 chk.validate(tree.recvparam, newEnv);
942 }
944 // annotation method checks
945 if ((owner.flags() & ANNOTATION) != 0) {
946 // annotation method cannot have throws clause
947 if (tree.thrown.nonEmpty()) {
948 log.error(tree.thrown.head.pos(),
949 "throws.not.allowed.in.intf.annotation");
950 }
951 // annotation method cannot declare type-parameters
952 if (tree.typarams.nonEmpty()) {
953 log.error(tree.typarams.head.pos(),
954 "intf.annotation.members.cant.have.type.params");
955 }
956 // validate annotation method's return type (could be an annotation type)
957 chk.validateAnnotationType(tree.restype);
958 // ensure that annotation method does not clash with members of Object/Annotation
959 chk.validateAnnotationMethod(tree.pos(), m);
961 if (tree.defaultValue != null) {
962 // if default value is an annotation, check it is a well-formed
963 // annotation value (e.g. no duplicate values, no missing values, etc.)
964 chk.validateAnnotationTree(tree.defaultValue);
965 }
966 }
968 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
969 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
971 if (tree.body == null) {
972 // Empty bodies are only allowed for
973 // abstract, native, or interface methods, or for methods
974 // in a retrofit signature class.
975 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
976 !relax)
977 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
978 if (tree.defaultValue != null) {
979 if ((owner.flags() & ANNOTATION) == 0)
980 log.error(tree.pos(),
981 "default.allowed.in.intf.annotation.member");
982 }
983 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
984 if ((owner.flags() & INTERFACE) != 0) {
985 log.error(tree.body.pos(), "intf.meth.cant.have.body");
986 } else {
987 log.error(tree.pos(), "abstract.meth.cant.have.body");
988 }
989 } else if ((tree.mods.flags & NATIVE) != 0) {
990 log.error(tree.pos(), "native.meth.cant.have.body");
991 } else {
992 // Add an implicit super() call unless an explicit call to
993 // super(...) or this(...) is given
994 // or we are compiling class java.lang.Object.
995 if (tree.name == names.init && owner.type != syms.objectType) {
996 JCBlock body = tree.body;
997 if (body.stats.isEmpty() ||
998 !TreeInfo.isSelfCall(body.stats.head)) {
999 body.stats = body.stats.
1000 prepend(memberEnter.SuperCall(make.at(body.pos),
1001 List.<Type>nil(),
1002 List.<JCVariableDecl>nil(),
1003 false));
1004 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1005 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1006 TreeInfo.isSuperCall(body.stats.head)) {
1007 // enum constructors are not allowed to call super
1008 // directly, so make sure there aren't any super calls
1009 // in enum constructors, except in the compiler
1010 // generated one.
1011 log.error(tree.body.stats.head.pos(),
1012 "call.to.super.not.allowed.in.enum.ctor",
1013 env.enclClass.sym);
1014 }
1015 }
1017 // Attribute all type annotations in the body
1018 memberEnter.typeAnnotate(tree.body, localEnv, m);
1019 annotate.flush();
1021 // Attribute method body.
1022 attribStat(tree.body, localEnv);
1023 }
1025 localEnv.info.scope.leave();
1026 result = tree.type = m.type;
1027 chk.validateAnnotations(tree.mods.annotations, m);
1028 }
1029 finally {
1030 chk.setLint(prevLint);
1031 chk.setMethod(prevMethod);
1032 }
1033 }
1035 public void visitVarDef(JCVariableDecl tree) {
1036 // Local variables have not been entered yet, so we need to do it now:
1037 if (env.info.scope.owner.kind == MTH) {
1038 if (tree.sym != null) {
1039 // parameters have already been entered
1040 env.info.scope.enter(tree.sym);
1041 } else {
1042 memberEnter.memberEnter(tree, env);
1043 annotate.flush();
1044 }
1045 } else {
1046 if (tree.init != null) {
1047 // Field initializer expression need to be entered.
1048 memberEnter.typeAnnotate(tree.init, env, tree.sym);
1049 annotate.flush();
1050 }
1051 }
1053 VarSymbol v = tree.sym;
1054 Lint lint = env.info.lint.augment(v);
1055 Lint prevLint = chk.setLint(lint);
1057 // Check that the variable's declared type is well-formed.
1058 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1059 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1060 (tree.sym.flags() & PARAMETER) != 0;
1061 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1062 deferredLintHandler.flush(tree.pos());
1064 try {
1065 chk.checkDeprecatedAnnotation(tree.pos(), v);
1067 if (tree.init != null) {
1068 if ((v.flags_field & FINAL) != 0 &&
1069 !tree.init.hasTag(NEWCLASS) &&
1070 !tree.init.hasTag(LAMBDA) &&
1071 !tree.init.hasTag(REFERENCE)) {
1072 // In this case, `v' is final. Ensure that it's initializer is
1073 // evaluated.
1074 v.getConstValue(); // ensure initializer is evaluated
1075 } else {
1076 // Attribute initializer in a new environment
1077 // with the declared variable as owner.
1078 // Check that initializer conforms to variable's declared type.
1079 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1080 initEnv.info.lint = lint;
1081 // In order to catch self-references, we set the variable's
1082 // declaration position to maximal possible value, effectively
1083 // marking the variable as undefined.
1084 initEnv.info.enclVar = v;
1085 attribExpr(tree.init, initEnv, v.type);
1086 }
1087 }
1088 result = tree.type = v.type;
1089 chk.validateAnnotations(tree.mods.annotations, v);
1090 }
1091 finally {
1092 chk.setLint(prevLint);
1093 }
1094 }
1096 public void visitSkip(JCSkip tree) {
1097 result = null;
1098 }
1100 public void visitBlock(JCBlock tree) {
1101 if (env.info.scope.owner.kind == TYP) {
1102 // Block is a static or instance initializer;
1103 // let the owner of the environment be a freshly
1104 // created BLOCK-method.
1105 Env<AttrContext> localEnv =
1106 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1107 localEnv.info.scope.owner =
1108 new MethodSymbol(tree.flags | BLOCK |
1109 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1110 env.info.scope.owner);
1111 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1113 // Attribute all type annotations in the block
1114 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1115 annotate.flush();
1117 {
1118 // Store init and clinit type annotations with the ClassSymbol
1119 // to allow output in Gen.normalizeDefs.
1120 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1121 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1122 if ((tree.flags & STATIC) != 0) {
1123 cs.appendClassInitTypeAttributes(tas);
1124 } else {
1125 cs.appendInitTypeAttributes(tas);
1126 }
1127 }
1129 attribStats(tree.stats, localEnv);
1130 } else {
1131 // Create a new local environment with a local scope.
1132 Env<AttrContext> localEnv =
1133 env.dup(tree, env.info.dup(env.info.scope.dup()));
1134 try {
1135 attribStats(tree.stats, localEnv);
1136 } finally {
1137 localEnv.info.scope.leave();
1138 }
1139 }
1140 result = null;
1141 }
1143 public void visitDoLoop(JCDoWhileLoop tree) {
1144 attribStat(tree.body, env.dup(tree));
1145 attribExpr(tree.cond, env, syms.booleanType);
1146 result = null;
1147 }
1149 public void visitWhileLoop(JCWhileLoop tree) {
1150 attribExpr(tree.cond, env, syms.booleanType);
1151 attribStat(tree.body, env.dup(tree));
1152 result = null;
1153 }
1155 public void visitForLoop(JCForLoop tree) {
1156 Env<AttrContext> loopEnv =
1157 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1158 try {
1159 attribStats(tree.init, loopEnv);
1160 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1161 loopEnv.tree = tree; // before, we were not in loop!
1162 attribStats(tree.step, loopEnv);
1163 attribStat(tree.body, loopEnv);
1164 result = null;
1165 }
1166 finally {
1167 loopEnv.info.scope.leave();
1168 }
1169 }
1171 public void visitForeachLoop(JCEnhancedForLoop tree) {
1172 Env<AttrContext> loopEnv =
1173 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1174 try {
1175 //the Formal Parameter of a for-each loop is not in the scope when
1176 //attributing the for-each expression; we mimick this by attributing
1177 //the for-each expression first (against original scope).
1178 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1179 attribStat(tree.var, loopEnv);
1180 chk.checkNonVoid(tree.pos(), exprType);
1181 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1182 if (elemtype == null) {
1183 // or perhaps expr implements Iterable<T>?
1184 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1185 if (base == null) {
1186 log.error(tree.expr.pos(),
1187 "foreach.not.applicable.to.type",
1188 exprType,
1189 diags.fragment("type.req.array.or.iterable"));
1190 elemtype = types.createErrorType(exprType);
1191 } else {
1192 List<Type> iterableParams = base.allparams();
1193 elemtype = iterableParams.isEmpty()
1194 ? syms.objectType
1195 : types.upperBound(iterableParams.head);
1196 }
1197 }
1198 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1199 loopEnv.tree = tree; // before, we were not in loop!
1200 attribStat(tree.body, loopEnv);
1201 result = null;
1202 }
1203 finally {
1204 loopEnv.info.scope.leave();
1205 }
1206 }
1208 public void visitLabelled(JCLabeledStatement tree) {
1209 // Check that label is not used in an enclosing statement
1210 Env<AttrContext> env1 = env;
1211 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1212 if (env1.tree.hasTag(LABELLED) &&
1213 ((JCLabeledStatement) env1.tree).label == tree.label) {
1214 log.error(tree.pos(), "label.already.in.use",
1215 tree.label);
1216 break;
1217 }
1218 env1 = env1.next;
1219 }
1221 attribStat(tree.body, env.dup(tree));
1222 result = null;
1223 }
1225 public void visitSwitch(JCSwitch tree) {
1226 Type seltype = attribExpr(tree.selector, env);
1228 Env<AttrContext> switchEnv =
1229 env.dup(tree, env.info.dup(env.info.scope.dup()));
1231 try {
1233 boolean enumSwitch =
1234 allowEnums &&
1235 (seltype.tsym.flags() & Flags.ENUM) != 0;
1236 boolean stringSwitch = false;
1237 if (types.isSameType(seltype, syms.stringType)) {
1238 if (allowStringsInSwitch) {
1239 stringSwitch = true;
1240 } else {
1241 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1242 }
1243 }
1244 if (!enumSwitch && !stringSwitch)
1245 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1247 // Attribute all cases and
1248 // check that there are no duplicate case labels or default clauses.
1249 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1250 boolean hasDefault = false; // Is there a default label?
1251 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1252 JCCase c = l.head;
1253 Env<AttrContext> caseEnv =
1254 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1255 try {
1256 if (c.pat != null) {
1257 if (enumSwitch) {
1258 Symbol sym = enumConstant(c.pat, seltype);
1259 if (sym == null) {
1260 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1261 } else if (!labels.add(sym)) {
1262 log.error(c.pos(), "duplicate.case.label");
1263 }
1264 } else {
1265 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1266 if (!pattype.hasTag(ERROR)) {
1267 if (pattype.constValue() == null) {
1268 log.error(c.pat.pos(),
1269 (stringSwitch ? "string.const.req" : "const.expr.req"));
1270 } else if (labels.contains(pattype.constValue())) {
1271 log.error(c.pos(), "duplicate.case.label");
1272 } else {
1273 labels.add(pattype.constValue());
1274 }
1275 }
1276 }
1277 } else if (hasDefault) {
1278 log.error(c.pos(), "duplicate.default.label");
1279 } else {
1280 hasDefault = true;
1281 }
1282 attribStats(c.stats, caseEnv);
1283 } finally {
1284 caseEnv.info.scope.leave();
1285 addVars(c.stats, switchEnv.info.scope);
1286 }
1287 }
1289 result = null;
1290 }
1291 finally {
1292 switchEnv.info.scope.leave();
1293 }
1294 }
1295 // where
1296 /** Add any variables defined in stats to the switch scope. */
1297 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1298 for (;stats.nonEmpty(); stats = stats.tail) {
1299 JCTree stat = stats.head;
1300 if (stat.hasTag(VARDEF))
1301 switchScope.enter(((JCVariableDecl) stat).sym);
1302 }
1303 }
1304 // where
1305 /** Return the selected enumeration constant symbol, or null. */
1306 private Symbol enumConstant(JCTree tree, Type enumType) {
1307 if (!tree.hasTag(IDENT)) {
1308 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1309 return syms.errSymbol;
1310 }
1311 JCIdent ident = (JCIdent)tree;
1312 Name name = ident.name;
1313 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1314 e.scope != null; e = e.next()) {
1315 if (e.sym.kind == VAR) {
1316 Symbol s = ident.sym = e.sym;
1317 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1318 ident.type = s.type;
1319 return ((s.flags_field & Flags.ENUM) == 0)
1320 ? null : s;
1321 }
1322 }
1323 return null;
1324 }
1326 public void visitSynchronized(JCSynchronized tree) {
1327 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1328 attribStat(tree.body, env);
1329 result = null;
1330 }
1332 public void visitTry(JCTry tree) {
1333 // Create a new local environment with a local
1334 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1335 try {
1336 boolean isTryWithResource = tree.resources.nonEmpty();
1337 // Create a nested environment for attributing the try block if needed
1338 Env<AttrContext> tryEnv = isTryWithResource ?
1339 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1340 localEnv;
1341 try {
1342 // Attribute resource declarations
1343 for (JCTree resource : tree.resources) {
1344 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1345 @Override
1346 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1347 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1348 }
1349 };
1350 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1351 if (resource.hasTag(VARDEF)) {
1352 attribStat(resource, tryEnv);
1353 twrResult.check(resource, resource.type);
1355 //check that resource type cannot throw InterruptedException
1356 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1358 VarSymbol var = ((JCVariableDecl) resource).sym;
1359 var.setData(ElementKind.RESOURCE_VARIABLE);
1360 } else {
1361 attribTree(resource, tryEnv, twrResult);
1362 }
1363 }
1364 // Attribute body
1365 attribStat(tree.body, tryEnv);
1366 } finally {
1367 if (isTryWithResource)
1368 tryEnv.info.scope.leave();
1369 }
1371 // Attribute catch clauses
1372 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1373 JCCatch c = l.head;
1374 Env<AttrContext> catchEnv =
1375 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1376 try {
1377 Type ctype = attribStat(c.param, catchEnv);
1378 if (TreeInfo.isMultiCatch(c)) {
1379 //multi-catch parameter is implicitly marked as final
1380 c.param.sym.flags_field |= FINAL | UNION;
1381 }
1382 if (c.param.sym.kind == Kinds.VAR) {
1383 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1384 }
1385 chk.checkType(c.param.vartype.pos(),
1386 chk.checkClassType(c.param.vartype.pos(), ctype),
1387 syms.throwableType);
1388 attribStat(c.body, catchEnv);
1389 } finally {
1390 catchEnv.info.scope.leave();
1391 }
1392 }
1394 // Attribute finalizer
1395 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1396 result = null;
1397 }
1398 finally {
1399 localEnv.info.scope.leave();
1400 }
1401 }
1403 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1404 if (!resource.isErroneous() &&
1405 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1406 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1407 Symbol close = syms.noSymbol;
1408 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1409 try {
1410 close = rs.resolveQualifiedMethod(pos,
1411 env,
1412 resource,
1413 names.close,
1414 List.<Type>nil(),
1415 List.<Type>nil());
1416 }
1417 finally {
1418 log.popDiagnosticHandler(discardHandler);
1419 }
1420 if (close.kind == MTH &&
1421 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1422 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1423 env.info.lint.isEnabled(LintCategory.TRY)) {
1424 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1425 }
1426 }
1427 }
1429 public void visitConditional(JCConditional tree) {
1430 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1432 tree.polyKind = (!allowPoly ||
1433 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1434 isBooleanOrNumeric(env, tree)) ?
1435 PolyKind.STANDALONE : PolyKind.POLY;
1437 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1438 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1439 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1440 result = tree.type = types.createErrorType(resultInfo.pt);
1441 return;
1442 }
1444 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1445 unknownExprInfo :
1446 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1447 //this will use enclosing check context to check compatibility of
1448 //subexpression against target type; if we are in a method check context,
1449 //depending on whether boxing is allowed, we could have incompatibilities
1450 @Override
1451 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1452 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1453 }
1454 });
1456 Type truetype = attribTree(tree.truepart, env, condInfo);
1457 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1459 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1460 if (condtype.constValue() != null &&
1461 truetype.constValue() != null &&
1462 falsetype.constValue() != null &&
1463 !owntype.hasTag(NONE)) {
1464 //constant folding
1465 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1466 }
1467 result = check(tree, owntype, VAL, resultInfo);
1468 }
1469 //where
1470 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1471 switch (tree.getTag()) {
1472 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1473 ((JCLiteral)tree).typetag == BOOLEAN ||
1474 ((JCLiteral)tree).typetag == BOT;
1475 case LAMBDA: case REFERENCE: return false;
1476 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1477 case CONDEXPR:
1478 JCConditional condTree = (JCConditional)tree;
1479 return isBooleanOrNumeric(env, condTree.truepart) &&
1480 isBooleanOrNumeric(env, condTree.falsepart);
1481 case APPLY:
1482 JCMethodInvocation speculativeMethodTree =
1483 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1484 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1485 return types.unboxedTypeOrType(owntype).isPrimitive();
1486 case NEWCLASS:
1487 JCExpression className =
1488 removeClassParams.translate(((JCNewClass)tree).clazz);
1489 JCExpression speculativeNewClassTree =
1490 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1491 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1492 default:
1493 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1494 speculativeType = types.unboxedTypeOrType(speculativeType);
1495 return speculativeType.isPrimitive();
1496 }
1497 }
1498 //where
1499 TreeTranslator removeClassParams = new TreeTranslator() {
1500 @Override
1501 public void visitTypeApply(JCTypeApply tree) {
1502 result = translate(tree.clazz);
1503 }
1504 };
1506 /** Compute the type of a conditional expression, after
1507 * checking that it exists. See JLS 15.25. Does not take into
1508 * account the special case where condition and both arms
1509 * are constants.
1510 *
1511 * @param pos The source position to be used for error
1512 * diagnostics.
1513 * @param thentype The type of the expression's then-part.
1514 * @param elsetype The type of the expression's else-part.
1515 */
1516 private Type condType(DiagnosticPosition pos,
1517 Type thentype, Type elsetype) {
1518 // If same type, that is the result
1519 if (types.isSameType(thentype, elsetype))
1520 return thentype.baseType();
1522 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1523 ? thentype : types.unboxedType(thentype);
1524 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1525 ? elsetype : types.unboxedType(elsetype);
1527 // Otherwise, if both arms can be converted to a numeric
1528 // type, return the least numeric type that fits both arms
1529 // (i.e. return larger of the two, or return int if one
1530 // arm is short, the other is char).
1531 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1532 // If one arm has an integer subrange type (i.e., byte,
1533 // short, or char), and the other is an integer constant
1534 // that fits into the subrange, return the subrange type.
1535 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && elseUnboxed.hasTag(INT) &&
1536 types.isAssignable(elseUnboxed, thenUnboxed))
1537 return thenUnboxed.baseType();
1538 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && thenUnboxed.hasTag(INT) &&
1539 types.isAssignable(thenUnboxed, elseUnboxed))
1540 return elseUnboxed.baseType();
1542 for (TypeTag tag : TypeTag.values()) {
1543 if (tag.ordinal() >= TypeTag.getTypeTagCount()) break;
1544 Type candidate = syms.typeOfTag[tag.ordinal()];
1545 if (candidate != null &&
1546 candidate.isPrimitive() &&
1547 types.isSubtype(thenUnboxed, candidate) &&
1548 types.isSubtype(elseUnboxed, candidate))
1549 return candidate;
1550 }
1551 }
1553 // Those were all the cases that could result in a primitive
1554 if (allowBoxing) {
1555 if (thentype.isPrimitive())
1556 thentype = types.boxedClass(thentype).type;
1557 if (elsetype.isPrimitive())
1558 elsetype = types.boxedClass(elsetype).type;
1559 }
1561 if (types.isSubtype(thentype, elsetype))
1562 return elsetype.baseType();
1563 if (types.isSubtype(elsetype, thentype))
1564 return thentype.baseType();
1566 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1567 log.error(pos, "neither.conditional.subtype",
1568 thentype, elsetype);
1569 return thentype.baseType();
1570 }
1572 // both are known to be reference types. The result is
1573 // lub(thentype,elsetype). This cannot fail, as it will
1574 // always be possible to infer "Object" if nothing better.
1575 return types.lub(thentype.baseType(), elsetype.baseType());
1576 }
1578 public void visitIf(JCIf tree) {
1579 attribExpr(tree.cond, env, syms.booleanType);
1580 attribStat(tree.thenpart, env);
1581 if (tree.elsepart != null)
1582 attribStat(tree.elsepart, env);
1583 chk.checkEmptyIf(tree);
1584 result = null;
1585 }
1587 public void visitExec(JCExpressionStatement tree) {
1588 //a fresh environment is required for 292 inference to work properly ---
1589 //see Infer.instantiatePolymorphicSignatureInstance()
1590 Env<AttrContext> localEnv = env.dup(tree);
1591 attribExpr(tree.expr, localEnv);
1592 result = null;
1593 }
1595 public void visitBreak(JCBreak tree) {
1596 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1597 result = null;
1598 }
1600 public void visitContinue(JCContinue tree) {
1601 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1602 result = null;
1603 }
1604 //where
1605 /** Return the target of a break or continue statement, if it exists,
1606 * report an error if not.
1607 * Note: The target of a labelled break or continue is the
1608 * (non-labelled) statement tree referred to by the label,
1609 * not the tree representing the labelled statement itself.
1610 *
1611 * @param pos The position to be used for error diagnostics
1612 * @param tag The tag of the jump statement. This is either
1613 * Tree.BREAK or Tree.CONTINUE.
1614 * @param label The label of the jump statement, or null if no
1615 * label is given.
1616 * @param env The environment current at the jump statement.
1617 */
1618 private JCTree findJumpTarget(DiagnosticPosition pos,
1619 JCTree.Tag tag,
1620 Name label,
1621 Env<AttrContext> env) {
1622 // Search environments outwards from the point of jump.
1623 Env<AttrContext> env1 = env;
1624 LOOP:
1625 while (env1 != null) {
1626 switch (env1.tree.getTag()) {
1627 case LABELLED:
1628 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1629 if (label == labelled.label) {
1630 // If jump is a continue, check that target is a loop.
1631 if (tag == CONTINUE) {
1632 if (!labelled.body.hasTag(DOLOOP) &&
1633 !labelled.body.hasTag(WHILELOOP) &&
1634 !labelled.body.hasTag(FORLOOP) &&
1635 !labelled.body.hasTag(FOREACHLOOP))
1636 log.error(pos, "not.loop.label", label);
1637 // Found labelled statement target, now go inwards
1638 // to next non-labelled tree.
1639 return TreeInfo.referencedStatement(labelled);
1640 } else {
1641 return labelled;
1642 }
1643 }
1644 break;
1645 case DOLOOP:
1646 case WHILELOOP:
1647 case FORLOOP:
1648 case FOREACHLOOP:
1649 if (label == null) return env1.tree;
1650 break;
1651 case SWITCH:
1652 if (label == null && tag == BREAK) return env1.tree;
1653 break;
1654 case LAMBDA:
1655 case METHODDEF:
1656 case CLASSDEF:
1657 break LOOP;
1658 default:
1659 }
1660 env1 = env1.next;
1661 }
1662 if (label != null)
1663 log.error(pos, "undef.label", label);
1664 else if (tag == CONTINUE)
1665 log.error(pos, "cont.outside.loop");
1666 else
1667 log.error(pos, "break.outside.switch.loop");
1668 return null;
1669 }
1671 public void visitReturn(JCReturn tree) {
1672 // Check that there is an enclosing method which is
1673 // nested within than the enclosing class.
1674 if (env.info.returnResult == null) {
1675 log.error(tree.pos(), "ret.outside.meth");
1676 } else {
1677 // Attribute return expression, if it exists, and check that
1678 // it conforms to result type of enclosing method.
1679 if (tree.expr != null) {
1680 if (env.info.returnResult.pt.hasTag(VOID)) {
1681 env.info.returnResult.checkContext.report(tree.expr.pos(),
1682 diags.fragment("unexpected.ret.val"));
1683 }
1684 attribTree(tree.expr, env, env.info.returnResult);
1685 } else if (!env.info.returnResult.pt.hasTag(VOID)) {
1686 env.info.returnResult.checkContext.report(tree.pos(),
1687 diags.fragment("missing.ret.val"));
1688 }
1689 }
1690 result = null;
1691 }
1693 public void visitThrow(JCThrow tree) {
1694 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1695 if (allowPoly) {
1696 chk.checkType(tree, owntype, syms.throwableType);
1697 }
1698 result = null;
1699 }
1701 public void visitAssert(JCAssert tree) {
1702 attribExpr(tree.cond, env, syms.booleanType);
1703 if (tree.detail != null) {
1704 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1705 }
1706 result = null;
1707 }
1709 /** Visitor method for method invocations.
1710 * NOTE: The method part of an application will have in its type field
1711 * the return type of the method, not the method's type itself!
1712 */
1713 public void visitApply(JCMethodInvocation tree) {
1714 // The local environment of a method application is
1715 // a new environment nested in the current one.
1716 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1718 // The types of the actual method arguments.
1719 List<Type> argtypes;
1721 // The types of the actual method type arguments.
1722 List<Type> typeargtypes = null;
1724 Name methName = TreeInfo.name(tree.meth);
1726 boolean isConstructorCall =
1727 methName == names._this || methName == names._super;
1729 if (isConstructorCall) {
1730 // We are seeing a ...this(...) or ...super(...) call.
1731 // Check that this is the first statement in a constructor.
1732 if (checkFirstConstructorStat(tree, env)) {
1734 // Record the fact
1735 // that this is a constructor call (using isSelfCall).
1736 localEnv.info.isSelfCall = true;
1738 // Attribute arguments, yielding list of argument types.
1739 argtypes = attribArgs(tree.args, localEnv);
1740 typeargtypes = attribTypes(tree.typeargs, localEnv);
1742 // Variable `site' points to the class in which the called
1743 // constructor is defined.
1744 Type site = env.enclClass.sym.type;
1745 if (methName == names._super) {
1746 if (site == syms.objectType) {
1747 log.error(tree.meth.pos(), "no.superclass", site);
1748 site = types.createErrorType(syms.objectType);
1749 } else {
1750 site = types.supertype(site);
1751 }
1752 }
1754 if (site.hasTag(CLASS)) {
1755 Type encl = site.getEnclosingType();
1756 while (encl != null && encl.hasTag(TYPEVAR))
1757 encl = encl.getUpperBound();
1758 if (encl.hasTag(CLASS)) {
1759 // we are calling a nested class
1761 if (tree.meth.hasTag(SELECT)) {
1762 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1764 // We are seeing a prefixed call, of the form
1765 // <expr>.super(...).
1766 // Check that the prefix expression conforms
1767 // to the outer instance type of the class.
1768 chk.checkRefType(qualifier.pos(),
1769 attribExpr(qualifier, localEnv,
1770 encl));
1771 } else if (methName == names._super) {
1772 // qualifier omitted; check for existence
1773 // of an appropriate implicit qualifier.
1774 rs.resolveImplicitThis(tree.meth.pos(),
1775 localEnv, site, true);
1776 }
1777 } else if (tree.meth.hasTag(SELECT)) {
1778 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1779 site.tsym);
1780 }
1782 // if we're calling a java.lang.Enum constructor,
1783 // prefix the implicit String and int parameters
1784 if (site.tsym == syms.enumSym && allowEnums)
1785 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1787 // Resolve the called constructor under the assumption
1788 // that we are referring to a superclass instance of the
1789 // current instance (JLS ???).
1790 boolean selectSuperPrev = localEnv.info.selectSuper;
1791 localEnv.info.selectSuper = true;
1792 localEnv.info.pendingResolutionPhase = null;
1793 Symbol sym = rs.resolveConstructor(
1794 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1795 localEnv.info.selectSuper = selectSuperPrev;
1797 // Set method symbol to resolved constructor...
1798 TreeInfo.setSymbol(tree.meth, sym);
1800 // ...and check that it is legal in the current context.
1801 // (this will also set the tree's type)
1802 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1803 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1804 }
1805 // Otherwise, `site' is an error type and we do nothing
1806 }
1807 result = tree.type = syms.voidType;
1808 } else {
1809 // Otherwise, we are seeing a regular method call.
1810 // Attribute the arguments, yielding list of argument types, ...
1811 argtypes = attribArgs(tree.args, localEnv);
1812 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1814 // ... and attribute the method using as a prototype a methodtype
1815 // whose formal argument types is exactly the list of actual
1816 // arguments (this will also set the method symbol).
1817 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1818 localEnv.info.pendingResolutionPhase = null;
1819 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(VAL, mpt, resultInfo.checkContext));
1821 // Compute the result type.
1822 Type restype = mtype.getReturnType();
1823 if (restype.hasTag(WILDCARD))
1824 throw new AssertionError(mtype);
1826 Type qualifier = (tree.meth.hasTag(SELECT))
1827 ? ((JCFieldAccess) tree.meth).selected.type
1828 : env.enclClass.sym.type;
1829 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1831 chk.checkRefTypes(tree.typeargs, typeargtypes);
1833 // Check that value of resulting type is admissible in the
1834 // current context. Also, capture the return type
1835 result = check(tree, capture(restype), VAL, resultInfo);
1836 }
1837 chk.validate(tree.typeargs, localEnv);
1838 }
1839 //where
1840 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1841 if (allowCovariantReturns &&
1842 methodName == names.clone &&
1843 types.isArray(qualifierType)) {
1844 // as a special case, array.clone() has a result that is
1845 // the same as static type of the array being cloned
1846 return qualifierType;
1847 } else if (allowGenerics &&
1848 methodName == names.getClass &&
1849 argtypes.isEmpty()) {
1850 // as a special case, x.getClass() has type Class<? extends |X|>
1851 return new ClassType(restype.getEnclosingType(),
1852 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1853 BoundKind.EXTENDS,
1854 syms.boundClass)),
1855 restype.tsym);
1856 } else {
1857 return restype;
1858 }
1859 }
1861 /** Check that given application node appears as first statement
1862 * in a constructor call.
1863 * @param tree The application node
1864 * @param env The environment current at the application.
1865 */
1866 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1867 JCMethodDecl enclMethod = env.enclMethod;
1868 if (enclMethod != null && enclMethod.name == names.init) {
1869 JCBlock body = enclMethod.body;
1870 if (body.stats.head.hasTag(EXEC) &&
1871 ((JCExpressionStatement) body.stats.head).expr == tree)
1872 return true;
1873 }
1874 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1875 TreeInfo.name(tree.meth));
1876 return false;
1877 }
1879 /** Obtain a method type with given argument types.
1880 */
1881 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1882 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1883 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1884 }
1886 public void visitNewClass(final JCNewClass tree) {
1887 Type owntype = types.createErrorType(tree.type);
1889 // The local environment of a class creation is
1890 // a new environment nested in the current one.
1891 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1893 // The anonymous inner class definition of the new expression,
1894 // if one is defined by it.
1895 JCClassDecl cdef = tree.def;
1897 // If enclosing class is given, attribute it, and
1898 // complete class name to be fully qualified
1899 JCExpression clazz = tree.clazz; // Class field following new
1900 JCExpression clazzid; // Identifier in class field
1901 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1902 annoclazzid = null;
1904 if (clazz.hasTag(TYPEAPPLY)) {
1905 clazzid = ((JCTypeApply) clazz).clazz;
1906 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1907 annoclazzid = (JCAnnotatedType) clazzid;
1908 clazzid = annoclazzid.underlyingType;
1909 }
1910 } else {
1911 if (clazz.hasTag(ANNOTATED_TYPE)) {
1912 annoclazzid = (JCAnnotatedType) clazz;
1913 clazzid = annoclazzid.underlyingType;
1914 } else {
1915 clazzid = clazz;
1916 }
1917 }
1919 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1921 if (tree.encl != null) {
1922 // We are seeing a qualified new, of the form
1923 // <expr>.new C <...> (...) ...
1924 // In this case, we let clazz stand for the name of the
1925 // allocated class C prefixed with the type of the qualifier
1926 // expression, so that we can
1927 // resolve it with standard techniques later. I.e., if
1928 // <expr> has type T, then <expr>.new C <...> (...)
1929 // yields a clazz T.C.
1930 Type encltype = chk.checkRefType(tree.encl.pos(),
1931 attribExpr(tree.encl, env));
1932 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1933 // from expr to the combined type, or not? Yes, do this.
1934 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1935 ((JCIdent) clazzid).name);
1937 if (clazz.hasTag(ANNOTATED_TYPE)) {
1938 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1939 List<JCAnnotation> annos = annoType.annotations;
1941 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1942 clazzid1 = make.at(tree.pos).
1943 TypeApply(clazzid1,
1944 ((JCTypeApply) clazz).arguments);
1945 }
1947 clazzid1 = make.at(tree.pos).
1948 AnnotatedType(annos, clazzid1);
1949 } else if (clazz.hasTag(TYPEAPPLY)) {
1950 clazzid1 = make.at(tree.pos).
1951 TypeApply(clazzid1,
1952 ((JCTypeApply) clazz).arguments);
1953 }
1955 clazz = clazzid1;
1956 }
1958 // Attribute clazz expression and store
1959 // symbol + type back into the attributed tree.
1960 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1961 attribIdentAsEnumType(env, (JCIdent)clazz) :
1962 attribType(clazz, env);
1964 clazztype = chk.checkDiamond(tree, clazztype);
1965 chk.validate(clazz, localEnv);
1966 if (tree.encl != null) {
1967 // We have to work in this case to store
1968 // symbol + type back into the attributed tree.
1969 tree.clazz.type = clazztype;
1970 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1971 clazzid.type = ((JCIdent) clazzid).sym.type;
1972 if (annoclazzid != null) {
1973 annoclazzid.type = clazzid.type;
1974 }
1975 if (!clazztype.isErroneous()) {
1976 if (cdef != null && clazztype.tsym.isInterface()) {
1977 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1978 } else if (clazztype.tsym.isStatic()) {
1979 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1980 }
1981 }
1982 } else if (!clazztype.tsym.isInterface() &&
1983 clazztype.getEnclosingType().hasTag(CLASS)) {
1984 // Check for the existence of an apropos outer instance
1985 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1986 }
1988 // Attribute constructor arguments.
1989 List<Type> argtypes = attribArgs(tree.args, localEnv);
1990 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1992 // If we have made no mistakes in the class type...
1993 if (clazztype.hasTag(CLASS)) {
1994 // Enums may not be instantiated except implicitly
1995 if (allowEnums &&
1996 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1997 (!env.tree.hasTag(VARDEF) ||
1998 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1999 ((JCVariableDecl) env.tree).init != tree))
2000 log.error(tree.pos(), "enum.cant.be.instantiated");
2001 // Check that class is not abstract
2002 if (cdef == null &&
2003 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2004 log.error(tree.pos(), "abstract.cant.be.instantiated",
2005 clazztype.tsym);
2006 } else if (cdef != null && clazztype.tsym.isInterface()) {
2007 // Check that no constructor arguments are given to
2008 // anonymous classes implementing an interface
2009 if (!argtypes.isEmpty())
2010 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2012 if (!typeargtypes.isEmpty())
2013 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2015 // Error recovery: pretend no arguments were supplied.
2016 argtypes = List.nil();
2017 typeargtypes = List.nil();
2018 } else if (TreeInfo.isDiamond(tree)) {
2019 ClassType site = new ClassType(clazztype.getEnclosingType(),
2020 clazztype.tsym.type.getTypeArguments(),
2021 clazztype.tsym);
2023 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2024 diamondEnv.info.selectSuper = cdef != null;
2025 diamondEnv.info.pendingResolutionPhase = null;
2027 //if the type of the instance creation expression is a class type
2028 //apply method resolution inference (JLS 15.12.2.7). The return type
2029 //of the resolved constructor will be a partially instantiated type
2030 Symbol constructor = rs.resolveDiamond(tree.pos(),
2031 diamondEnv,
2032 site,
2033 argtypes,
2034 typeargtypes);
2035 tree.constructor = constructor.baseSymbol();
2037 final TypeSymbol csym = clazztype.tsym;
2038 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2039 @Override
2040 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2041 enclosingContext.report(tree.clazz,
2042 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2043 }
2044 });
2045 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2046 constructorType = checkId(tree, site,
2047 constructor,
2048 diamondEnv,
2049 diamondResult);
2051 tree.clazz.type = types.createErrorType(clazztype);
2052 if (!constructorType.isErroneous()) {
2053 tree.clazz.type = clazztype = constructorType.getReturnType();
2054 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2055 }
2056 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2057 }
2059 // Resolve the called constructor under the assumption
2060 // that we are referring to a superclass instance of the
2061 // current instance (JLS ???).
2062 else {
2063 //the following code alters some of the fields in the current
2064 //AttrContext - hence, the current context must be dup'ed in
2065 //order to avoid downstream failures
2066 Env<AttrContext> rsEnv = localEnv.dup(tree);
2067 rsEnv.info.selectSuper = cdef != null;
2068 rsEnv.info.pendingResolutionPhase = null;
2069 tree.constructor = rs.resolveConstructor(
2070 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2071 if (cdef == null) { //do not check twice!
2072 tree.constructorType = checkId(tree,
2073 clazztype,
2074 tree.constructor,
2075 rsEnv,
2076 new ResultInfo(MTH, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2077 if (rsEnv.info.lastResolveVarargs())
2078 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2079 }
2080 findDiamondIfNeeded(localEnv, tree, clazztype);
2081 }
2083 if (cdef != null) {
2084 // We are seeing an anonymous class instance creation.
2085 // In this case, the class instance creation
2086 // expression
2087 //
2088 // E.new <typeargs1>C<typargs2>(args) { ... }
2089 //
2090 // is represented internally as
2091 //
2092 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2093 //
2094 // This expression is then *transformed* as follows:
2095 //
2096 // (1) add a STATIC flag to the class definition
2097 // if the current environment is static
2098 // (2) add an extends or implements clause
2099 // (3) add a constructor.
2100 //
2101 // For instance, if C is a class, and ET is the type of E,
2102 // the expression
2103 //
2104 // E.new <typeargs1>C<typargs2>(args) { ... }
2105 //
2106 // is translated to (where X is a fresh name and typarams is the
2107 // parameter list of the super constructor):
2108 //
2109 // new <typeargs1>X(<*nullchk*>E, args) where
2110 // X extends C<typargs2> {
2111 // <typarams> X(ET e, args) {
2112 // e.<typeargs1>super(args)
2113 // }
2114 // ...
2115 // }
2116 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2118 if (clazztype.tsym.isInterface()) {
2119 cdef.implementing = List.of(clazz);
2120 } else {
2121 cdef.extending = clazz;
2122 }
2124 attribStat(cdef, localEnv);
2126 checkLambdaCandidate(tree, cdef.sym, clazztype);
2128 // If an outer instance is given,
2129 // prefix it to the constructor arguments
2130 // and delete it from the new expression
2131 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2132 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2133 argtypes = argtypes.prepend(tree.encl.type);
2134 tree.encl = null;
2135 }
2137 // Reassign clazztype and recompute constructor.
2138 clazztype = cdef.sym.type;
2139 Symbol sym = tree.constructor = rs.resolveConstructor(
2140 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2141 Assert.check(sym.kind < AMBIGUOUS);
2142 tree.constructor = sym;
2143 tree.constructorType = checkId(tree,
2144 clazztype,
2145 tree.constructor,
2146 localEnv,
2147 new ResultInfo(VAL, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2148 } else {
2149 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2150 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2151 tree.clazz.type.tsym);
2152 }
2153 }
2155 if (tree.constructor != null && tree.constructor.kind == MTH)
2156 owntype = clazztype;
2157 }
2158 result = check(tree, owntype, VAL, resultInfo);
2159 chk.validate(tree.typeargs, localEnv);
2160 }
2161 //where
2162 void findDiamondIfNeeded(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2163 if (tree.def == null &&
2164 !clazztype.isErroneous() &&
2165 clazztype.getTypeArguments().nonEmpty() &&
2166 findDiamonds) {
2167 JCTypeApply ta = (JCTypeApply)tree.clazz;
2168 List<JCExpression> prevTypeargs = ta.arguments;
2169 try {
2170 //create a 'fake' diamond AST node by removing type-argument trees
2171 ta.arguments = List.nil();
2172 ResultInfo findDiamondResult = new ResultInfo(VAL,
2173 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2174 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2175 Type polyPt = allowPoly ?
2176 syms.objectType :
2177 clazztype;
2178 if (!inferred.isErroneous() &&
2179 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings)) {
2180 String key = types.isSameType(clazztype, inferred) ?
2181 "diamond.redundant.args" :
2182 "diamond.redundant.args.1";
2183 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2184 }
2185 } finally {
2186 ta.arguments = prevTypeargs;
2187 }
2188 }
2189 }
2191 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2192 if (allowLambda &&
2193 identifyLambdaCandidate &&
2194 clazztype.hasTag(CLASS) &&
2195 !pt().hasTag(NONE) &&
2196 types.isFunctionalInterface(clazztype.tsym)) {
2197 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2198 int count = 0;
2199 boolean found = false;
2200 for (Symbol sym : csym.members().getElements()) {
2201 if ((sym.flags() & SYNTHETIC) != 0 ||
2202 sym.isConstructor()) continue;
2203 count++;
2204 if (sym.kind != MTH ||
2205 !sym.name.equals(descriptor.name)) continue;
2206 Type mtype = types.memberType(clazztype, sym);
2207 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2208 found = true;
2209 }
2210 }
2211 if (found && count == 1) {
2212 log.note(tree.def, "potential.lambda.found");
2213 }
2214 }
2215 }
2217 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2218 Symbol sym) {
2219 // Ensure that no declaration annotations are present.
2220 // Note that a tree type might be an AnnotatedType with
2221 // empty annotations, if only declaration annotations were given.
2222 // This method will raise an error for such a type.
2223 for (JCAnnotation ai : annotations) {
2224 if (TypeAnnotations.annotationType(syms, names, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2225 log.error(ai.pos(), "annotation.type.not.applicable");
2226 }
2227 }
2228 }
2231 /** Make an attributed null check tree.
2232 */
2233 public JCExpression makeNullCheck(JCExpression arg) {
2234 // optimization: X.this is never null; skip null check
2235 Name name = TreeInfo.name(arg);
2236 if (name == names._this || name == names._super) return arg;
2238 JCTree.Tag optag = NULLCHK;
2239 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2240 tree.operator = syms.nullcheck;
2241 tree.type = arg.type;
2242 return tree;
2243 }
2245 public void visitNewArray(JCNewArray tree) {
2246 Type owntype = types.createErrorType(tree.type);
2247 Env<AttrContext> localEnv = env.dup(tree);
2248 Type elemtype;
2249 if (tree.elemtype != null) {
2250 elemtype = attribType(tree.elemtype, localEnv);
2251 chk.validate(tree.elemtype, localEnv);
2252 owntype = elemtype;
2253 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2254 attribExpr(l.head, localEnv, syms.intType);
2255 owntype = new ArrayType(owntype, syms.arrayClass);
2256 }
2257 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2258 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2259 tree.elemtype.type.tsym);
2260 }
2261 } else {
2262 // we are seeing an untyped aggregate { ... }
2263 // this is allowed only if the prototype is an array
2264 if (pt().hasTag(ARRAY)) {
2265 elemtype = types.elemtype(pt());
2266 } else {
2267 if (!pt().hasTag(ERROR)) {
2268 log.error(tree.pos(), "illegal.initializer.for.type",
2269 pt());
2270 }
2271 elemtype = types.createErrorType(pt());
2272 }
2273 }
2274 if (tree.elems != null) {
2275 attribExprs(tree.elems, localEnv, elemtype);
2276 owntype = new ArrayType(elemtype, syms.arrayClass);
2277 }
2278 if (!types.isReifiable(elemtype))
2279 log.error(tree.pos(), "generic.array.creation");
2280 result = check(tree, owntype, VAL, resultInfo);
2281 }
2283 /*
2284 * A lambda expression can only be attributed when a target-type is available.
2285 * In addition, if the target-type is that of a functional interface whose
2286 * descriptor contains inference variables in argument position the lambda expression
2287 * is 'stuck' (see DeferredAttr).
2288 */
2289 @Override
2290 public void visitLambda(final JCLambda that) {
2291 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2292 if (pt().hasTag(NONE)) {
2293 //lambda only allowed in assignment or method invocation/cast context
2294 log.error(that.pos(), "unexpected.lambda");
2295 }
2296 result = that.type = types.createErrorType(pt());
2297 return;
2298 }
2299 //create an environment for attribution of the lambda expression
2300 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2301 boolean needsRecovery =
2302 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2303 try {
2304 Type target = pt();
2305 List<Type> explicitParamTypes = null;
2306 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2307 //attribute lambda parameters
2308 attribStats(that.params, localEnv);
2309 explicitParamTypes = TreeInfo.types(that.params);
2310 target = infer.instantiateFunctionalInterface(that, target, explicitParamTypes, resultInfo.checkContext);
2311 }
2313 Type lambdaType;
2314 if (pt() != Type.recoveryType) {
2315 target = targetChecker.visit(target, that);
2316 lambdaType = types.findDescriptorType(target);
2317 chk.checkFunctionalInterface(that, target);
2318 } else {
2319 target = Type.recoveryType;
2320 lambdaType = fallbackDescriptorType(that);
2321 }
2323 setFunctionalInfo(that, pt(), lambdaType, target, resultInfo.checkContext.inferenceContext());
2325 if (lambdaType.hasTag(FORALL)) {
2326 //lambda expression target desc cannot be a generic method
2327 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2328 lambdaType, kindName(target.tsym), target.tsym));
2329 result = that.type = types.createErrorType(pt());
2330 return;
2331 }
2333 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2334 //add param type info in the AST
2335 List<Type> actuals = lambdaType.getParameterTypes();
2336 List<JCVariableDecl> params = that.params;
2338 boolean arityMismatch = false;
2340 while (params.nonEmpty()) {
2341 if (actuals.isEmpty()) {
2342 //not enough actuals to perform lambda parameter inference
2343 arityMismatch = true;
2344 }
2345 //reset previously set info
2346 Type argType = arityMismatch ?
2347 syms.errType :
2348 actuals.head;
2349 params.head.vartype = make.at(params.head).Type(argType);
2350 params.head.sym = null;
2351 actuals = actuals.isEmpty() ?
2352 actuals :
2353 actuals.tail;
2354 params = params.tail;
2355 }
2357 //attribute lambda parameters
2358 attribStats(that.params, localEnv);
2360 if (arityMismatch) {
2361 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2362 result = that.type = types.createErrorType(target);
2363 return;
2364 }
2365 }
2367 //from this point on, no recovery is needed; if we are in assignment context
2368 //we will be able to attribute the whole lambda body, regardless of errors;
2369 //if we are in a 'check' method context, and the lambda is not compatible
2370 //with the target-type, it will be recovered anyway in Attr.checkId
2371 needsRecovery = false;
2373 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2374 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2375 new FunctionalReturnContext(resultInfo.checkContext);
2377 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2378 recoveryInfo :
2379 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2380 localEnv.info.returnResult = bodyResultInfo;
2382 Log.DeferredDiagnosticHandler lambdaDeferredHandler = new Log.DeferredDiagnosticHandler(log);
2383 try {
2384 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2385 attribTree(that.getBody(), localEnv, bodyResultInfo);
2386 } else {
2387 JCBlock body = (JCBlock)that.body;
2388 attribStats(body.stats, localEnv);
2389 }
2391 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.SPECULATIVE) {
2392 //check for errors in lambda body
2393 for (JCDiagnostic deferredDiag : lambdaDeferredHandler.getDiagnostics()) {
2394 if (deferredDiag.getKind() == JCDiagnostic.Kind.ERROR) {
2395 resultInfo.checkContext
2396 .report(that, diags.fragment("bad.arg.types.in.lambda", TreeInfo.types(that.params),
2397 deferredDiag)); //hidden diag parameter
2398 //we mark the lambda as erroneous - this is crucial in the recovery step
2399 //as parameter-dependent type error won't be reported in that stage,
2400 //meaning that a lambda will be deemed erroeneous only if there is
2401 //a target-independent error (which will cause method diagnostic
2402 //to be skipped).
2403 result = that.type = types.createErrorType(target);
2404 return;
2405 }
2406 }
2407 }
2408 } finally {
2409 lambdaDeferredHandler.reportDeferredDiagnostics();
2410 log.popDiagnosticHandler(lambdaDeferredHandler);
2411 }
2413 result = check(that, target, VAL, resultInfo);
2415 boolean isSpeculativeRound =
2416 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2418 postAttr(that);
2419 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2421 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2423 if (!isSpeculativeRound) {
2424 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, target);
2425 }
2426 result = check(that, target, VAL, resultInfo);
2427 } catch (Types.FunctionDescriptorLookupError ex) {
2428 JCDiagnostic cause = ex.getDiagnostic();
2429 resultInfo.checkContext.report(that, cause);
2430 result = that.type = types.createErrorType(pt());
2431 return;
2432 } finally {
2433 localEnv.info.scope.leave();
2434 if (needsRecovery) {
2435 attribTree(that, env, recoveryInfo);
2436 }
2437 }
2438 }
2439 //where
2440 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2442 @Override
2443 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2444 return t.isCompound() ?
2445 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2446 }
2448 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2449 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2450 Type target = null;
2451 for (Type bound : ict.getExplicitComponents()) {
2452 TypeSymbol boundSym = bound.tsym;
2453 if (types.isFunctionalInterface(boundSym) &&
2454 types.findDescriptorSymbol(boundSym) == desc) {
2455 target = bound;
2456 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2457 //bound must be an interface
2458 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2459 }
2460 }
2461 return target != null ?
2462 target :
2463 ict.getExplicitComponents().head; //error recovery
2464 }
2466 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2467 ListBuffer<Type> targs = ListBuffer.lb();
2468 ListBuffer<Type> supertypes = ListBuffer.lb();
2469 for (Type i : ict.interfaces_field) {
2470 if (i.isParameterized()) {
2471 targs.appendList(i.tsym.type.allparams());
2472 }
2473 supertypes.append(i.tsym.type);
2474 }
2475 IntersectionClassType notionalIntf =
2476 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2477 notionalIntf.allparams_field = targs.toList();
2478 notionalIntf.tsym.flags_field |= INTERFACE;
2479 return notionalIntf.tsym;
2480 }
2482 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2483 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2484 diags.fragment(key, args)));
2485 }
2486 };
2488 private Type fallbackDescriptorType(JCExpression tree) {
2489 switch (tree.getTag()) {
2490 case LAMBDA:
2491 JCLambda lambda = (JCLambda)tree;
2492 List<Type> argtypes = List.nil();
2493 for (JCVariableDecl param : lambda.params) {
2494 argtypes = param.vartype != null ?
2495 argtypes.append(param.vartype.type) :
2496 argtypes.append(syms.errType);
2497 }
2498 return new MethodType(argtypes, Type.recoveryType,
2499 List.of(syms.throwableType), syms.methodClass);
2500 case REFERENCE:
2501 return new MethodType(List.<Type>nil(), Type.recoveryType,
2502 List.of(syms.throwableType), syms.methodClass);
2503 default:
2504 Assert.error("Cannot get here!");
2505 }
2506 return null;
2507 }
2509 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2510 final InferenceContext inferenceContext, final Type... ts) {
2511 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2512 }
2514 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2515 final InferenceContext inferenceContext, final List<Type> ts) {
2516 if (inferenceContext.free(ts)) {
2517 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2518 @Override
2519 public void typesInferred(InferenceContext inferenceContext) {
2520 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2521 }
2522 });
2523 } else {
2524 for (Type t : ts) {
2525 rs.checkAccessibleType(env, t);
2526 }
2527 }
2528 }
2530 /**
2531 * Lambda/method reference have a special check context that ensures
2532 * that i.e. a lambda return type is compatible with the expected
2533 * type according to both the inherited context and the assignment
2534 * context.
2535 */
2536 class FunctionalReturnContext extends Check.NestedCheckContext {
2538 FunctionalReturnContext(CheckContext enclosingContext) {
2539 super(enclosingContext);
2540 }
2542 @Override
2543 public boolean compatible(Type found, Type req, Warner warn) {
2544 //return type must be compatible in both current context and assignment context
2545 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2546 }
2548 @Override
2549 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2550 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2551 }
2552 }
2554 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2556 JCExpression expr;
2558 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2559 super(enclosingContext);
2560 this.expr = expr;
2561 }
2563 @Override
2564 public boolean compatible(Type found, Type req, Warner warn) {
2565 //a void return is compatible with an expression statement lambda
2566 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2567 super.compatible(found, req, warn);
2568 }
2569 }
2571 /**
2572 * Lambda compatibility. Check that given return types, thrown types, parameter types
2573 * are compatible with the expected functional interface descriptor. This means that:
2574 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2575 * types must be compatible with the return type of the expected descriptor;
2576 * (iii) thrown types must be 'included' in the thrown types list of the expected
2577 * descriptor.
2578 */
2579 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2580 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2582 //return values have already been checked - but if lambda has no return
2583 //values, we must ensure that void/value compatibility is correct;
2584 //this amounts at checking that, if a lambda body can complete normally,
2585 //the descriptor's return type must be void
2586 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2587 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2588 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2589 diags.fragment("missing.ret.val", returnType)));
2590 }
2592 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2593 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2594 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2595 }
2597 if (!speculativeAttr) {
2598 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2599 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2600 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2601 }
2602 }
2603 }
2605 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2606 Env<AttrContext> lambdaEnv;
2607 Symbol owner = env.info.scope.owner;
2608 if (owner.kind == VAR && owner.owner.kind == TYP) {
2609 //field initializer
2610 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2611 lambdaEnv.info.scope.owner =
2612 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2613 env.info.scope.owner);
2614 } else {
2615 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2616 }
2617 return lambdaEnv;
2618 }
2620 @Override
2621 public void visitReference(final JCMemberReference that) {
2622 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2623 if (pt().hasTag(NONE)) {
2624 //method reference only allowed in assignment or method invocation/cast context
2625 log.error(that.pos(), "unexpected.mref");
2626 }
2627 result = that.type = types.createErrorType(pt());
2628 return;
2629 }
2630 final Env<AttrContext> localEnv = env.dup(that);
2631 try {
2632 //attribute member reference qualifier - if this is a constructor
2633 //reference, the expected kind must be a type
2634 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2636 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2637 exprType = chk.checkConstructorRefType(that.expr, exprType);
2638 }
2640 if (exprType.isErroneous()) {
2641 //if the qualifier expression contains problems,
2642 //give up attribution of method reference
2643 result = that.type = exprType;
2644 return;
2645 }
2647 if (TreeInfo.isStaticSelector(that.expr, names)) {
2648 //if the qualifier is a type, validate it; raw warning check is
2649 //omitted as we don't know at this stage as to whether this is a
2650 //raw selector (because of inference)
2651 chk.validate(that.expr, env, false);
2652 }
2654 //attrib type-arguments
2655 List<Type> typeargtypes = List.nil();
2656 if (that.typeargs != null) {
2657 typeargtypes = attribTypes(that.typeargs, localEnv);
2658 }
2660 Type target;
2661 Type desc;
2662 if (pt() != Type.recoveryType) {
2663 target = targetChecker.visit(pt(), that);
2664 desc = types.findDescriptorType(target);
2665 chk.checkFunctionalInterface(that, target);
2666 } else {
2667 target = Type.recoveryType;
2668 desc = fallbackDescriptorType(that);
2669 }
2671 setFunctionalInfo(that, pt(), desc, target, resultInfo.checkContext.inferenceContext());
2672 List<Type> argtypes = desc.getParameterTypes();
2674 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult =
2675 rs.resolveMemberReference(that.pos(), localEnv, that,
2676 that.expr.type, that.name, argtypes, typeargtypes, true, rs.resolveMethodCheck);
2678 Symbol refSym = refResult.fst;
2679 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2681 if (refSym.kind != MTH) {
2682 boolean targetError;
2683 switch (refSym.kind) {
2684 case ABSENT_MTH:
2685 targetError = false;
2686 break;
2687 case WRONG_MTH:
2688 case WRONG_MTHS:
2689 case AMBIGUOUS:
2690 case HIDDEN:
2691 case STATICERR:
2692 case MISSING_ENCL:
2693 targetError = true;
2694 break;
2695 default:
2696 Assert.error("unexpected result kind " + refSym.kind);
2697 targetError = false;
2698 }
2700 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2701 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2703 JCDiagnostic.DiagnosticType diagKind = targetError ?
2704 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2706 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2707 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2709 if (targetError && target == Type.recoveryType) {
2710 //a target error doesn't make sense during recovery stage
2711 //as we don't know what actual parameter types are
2712 result = that.type = target;
2713 return;
2714 } else {
2715 if (targetError) {
2716 resultInfo.checkContext.report(that, diag);
2717 } else {
2718 log.report(diag);
2719 }
2720 result = that.type = types.createErrorType(target);
2721 return;
2722 }
2723 }
2725 that.sym = refSym.baseSymbol();
2726 that.kind = lookupHelper.referenceKind(that.sym);
2727 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2729 if (desc.getReturnType() == Type.recoveryType) {
2730 // stop here
2731 result = that.type = target;
2732 return;
2733 }
2735 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2737 if (that.getMode() == ReferenceMode.INVOKE &&
2738 TreeInfo.isStaticSelector(that.expr, names) &&
2739 that.kind.isUnbound() &&
2740 !desc.getParameterTypes().head.isParameterized()) {
2741 chk.checkRaw(that.expr, localEnv);
2742 }
2744 if (!that.kind.isUnbound() &&
2745 that.getMode() == ReferenceMode.INVOKE &&
2746 TreeInfo.isStaticSelector(that.expr, names) &&
2747 !that.sym.isStatic()) {
2748 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2749 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2750 result = that.type = types.createErrorType(target);
2751 return;
2752 }
2754 if (that.kind.isUnbound() &&
2755 that.getMode() == ReferenceMode.INVOKE &&
2756 TreeInfo.isStaticSelector(that.expr, names) &&
2757 that.sym.isStatic()) {
2758 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2759 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2760 result = that.type = types.createErrorType(target);
2761 return;
2762 }
2764 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2765 exprType.getTypeArguments().nonEmpty()) {
2766 //static ref with class type-args
2767 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2768 diags.fragment("static.mref.with.targs"));
2769 result = that.type = types.createErrorType(target);
2770 return;
2771 }
2773 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2774 !that.kind.isUnbound()) {
2775 //no static bound mrefs
2776 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2777 diags.fragment("static.bound.mref"));
2778 result = that.type = types.createErrorType(target);
2779 return;
2780 }
2782 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2783 // Check that super-qualified symbols are not abstract (JLS)
2784 rs.checkNonAbstract(that.pos(), that.sym);
2785 }
2786 }
2788 that.sym = refSym.baseSymbol();
2789 that.kind = lookupHelper.referenceKind(that.sym);
2791 ResultInfo checkInfo =
2792 resultInfo.dup(newMethodTemplate(
2793 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2794 lookupHelper.argtypes,
2795 typeargtypes));
2797 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2799 if (!refType.isErroneous()) {
2800 refType = types.createMethodTypeWithReturn(refType,
2801 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2802 }
2804 //go ahead with standard method reference compatibility check - note that param check
2805 //is a no-op (as this has been taken care during method applicability)
2806 boolean isSpeculativeRound =
2807 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2808 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2809 if (!isSpeculativeRound) {
2810 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2811 }
2812 result = check(that, target, VAL, resultInfo);
2813 } catch (Types.FunctionDescriptorLookupError ex) {
2814 JCDiagnostic cause = ex.getDiagnostic();
2815 resultInfo.checkContext.report(that, cause);
2816 result = that.type = types.createErrorType(pt());
2817 return;
2818 }
2819 }
2820 //where
2821 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2822 //if this is a constructor reference, the expected kind must be a type
2823 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2824 }
2827 @SuppressWarnings("fallthrough")
2828 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2829 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2831 Type resType;
2832 switch (tree.getMode()) {
2833 case NEW:
2834 if (!tree.expr.type.isRaw()) {
2835 resType = tree.expr.type;
2836 break;
2837 }
2838 default:
2839 resType = refType.getReturnType();
2840 }
2842 Type incompatibleReturnType = resType;
2844 if (returnType.hasTag(VOID)) {
2845 incompatibleReturnType = null;
2846 }
2848 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2849 if (resType.isErroneous() ||
2850 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2851 incompatibleReturnType = null;
2852 }
2853 }
2855 if (incompatibleReturnType != null) {
2856 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2857 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2858 }
2860 if (!speculativeAttr) {
2861 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2862 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2863 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2864 }
2865 }
2866 }
2868 /**
2869 * Set functional type info on the underlying AST. Note: as the target descriptor
2870 * might contain inference variables, we might need to register an hook in the
2871 * current inference context.
2872 */
2873 private void setFunctionalInfo(final JCFunctionalExpression fExpr, final Type pt,
2874 final Type descriptorType, final Type primaryTarget, InferenceContext inferenceContext) {
2875 if (inferenceContext.free(descriptorType)) {
2876 inferenceContext.addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2877 public void typesInferred(InferenceContext inferenceContext) {
2878 setFunctionalInfo(fExpr, pt, inferenceContext.asInstType(descriptorType),
2879 inferenceContext.asInstType(primaryTarget), inferenceContext);
2880 }
2881 });
2882 } else {
2883 ListBuffer<TypeSymbol> targets = ListBuffer.lb();
2884 if (pt.hasTag(CLASS)) {
2885 if (pt.isCompound()) {
2886 targets.append(primaryTarget.tsym); //this goes first
2887 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2888 if (t != primaryTarget) {
2889 targets.append(t.tsym);
2890 }
2891 }
2892 } else {
2893 targets.append(pt.tsym);
2894 }
2895 }
2896 fExpr.targets = targets.toList();
2897 fExpr.descriptorType = descriptorType;
2898 }
2899 }
2901 public void visitParens(JCParens tree) {
2902 Type owntype = attribTree(tree.expr, env, resultInfo);
2903 result = check(tree, owntype, pkind(), resultInfo);
2904 Symbol sym = TreeInfo.symbol(tree);
2905 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2906 log.error(tree.pos(), "illegal.start.of.type");
2907 }
2909 public void visitAssign(JCAssign tree) {
2910 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2911 Type capturedType = capture(owntype);
2912 attribExpr(tree.rhs, env, owntype);
2913 result = check(tree, capturedType, VAL, resultInfo);
2914 }
2916 public void visitAssignop(JCAssignOp tree) {
2917 // Attribute arguments.
2918 Type owntype = attribTree(tree.lhs, env, varInfo);
2919 Type operand = attribExpr(tree.rhs, env);
2920 // Find operator.
2921 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2922 tree.pos(), tree.getTag().noAssignOp(), env,
2923 owntype, operand);
2925 if (operator.kind == MTH &&
2926 !owntype.isErroneous() &&
2927 !operand.isErroneous()) {
2928 chk.checkOperator(tree.pos(),
2929 (OperatorSymbol)operator,
2930 tree.getTag().noAssignOp(),
2931 owntype,
2932 operand);
2933 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2934 chk.checkCastable(tree.rhs.pos(),
2935 operator.type.getReturnType(),
2936 owntype);
2937 }
2938 result = check(tree, owntype, VAL, resultInfo);
2939 }
2941 public void visitUnary(JCUnary tree) {
2942 // Attribute arguments.
2943 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2944 ? attribTree(tree.arg, env, varInfo)
2945 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2947 // Find operator.
2948 Symbol operator = tree.operator =
2949 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2951 Type owntype = types.createErrorType(tree.type);
2952 if (operator.kind == MTH &&
2953 !argtype.isErroneous()) {
2954 owntype = (tree.getTag().isIncOrDecUnaryOp())
2955 ? tree.arg.type
2956 : operator.type.getReturnType();
2957 int opc = ((OperatorSymbol)operator).opcode;
2959 // If the argument is constant, fold it.
2960 if (argtype.constValue() != null) {
2961 Type ctype = cfolder.fold1(opc, argtype);
2962 if (ctype != null) {
2963 owntype = cfolder.coerce(ctype, owntype);
2965 // Remove constant types from arguments to
2966 // conserve space. The parser will fold concatenations
2967 // of string literals; the code here also
2968 // gets rid of intermediate results when some of the
2969 // operands are constant identifiers.
2970 if (tree.arg.type.tsym == syms.stringType.tsym) {
2971 tree.arg.type = syms.stringType;
2972 }
2973 }
2974 }
2975 }
2976 result = check(tree, owntype, VAL, resultInfo);
2977 }
2979 public void visitBinary(JCBinary tree) {
2980 // Attribute arguments.
2981 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
2982 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
2984 // Find operator.
2985 Symbol operator = tree.operator =
2986 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
2988 Type owntype = types.createErrorType(tree.type);
2989 if (operator.kind == MTH &&
2990 !left.isErroneous() &&
2991 !right.isErroneous()) {
2992 owntype = operator.type.getReturnType();
2993 int opc = chk.checkOperator(tree.lhs.pos(),
2994 (OperatorSymbol)operator,
2995 tree.getTag(),
2996 left,
2997 right);
2999 // If both arguments are constants, fold them.
3000 if (left.constValue() != null && right.constValue() != null) {
3001 Type ctype = cfolder.fold2(opc, left, right);
3002 if (ctype != null) {
3003 owntype = cfolder.coerce(ctype, owntype);
3005 // Remove constant types from arguments to
3006 // conserve space. The parser will fold concatenations
3007 // of string literals; the code here also
3008 // gets rid of intermediate results when some of the
3009 // operands are constant identifiers.
3010 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3011 tree.lhs.type = syms.stringType;
3012 }
3013 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3014 tree.rhs.type = syms.stringType;
3015 }
3016 }
3017 }
3019 // Check that argument types of a reference ==, != are
3020 // castable to each other, (JLS???).
3021 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3022 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3023 log.error(tree.pos(), "incomparable.types", left, right);
3024 }
3025 }
3027 chk.checkDivZero(tree.rhs.pos(), operator, right);
3028 }
3029 result = check(tree, owntype, VAL, resultInfo);
3030 }
3032 public void visitTypeCast(final JCTypeCast tree) {
3033 Type clazztype = attribType(tree.clazz, env);
3034 chk.validate(tree.clazz, env, false);
3035 //a fresh environment is required for 292 inference to work properly ---
3036 //see Infer.instantiatePolymorphicSignatureInstance()
3037 Env<AttrContext> localEnv = env.dup(tree);
3038 //should we propagate the target type?
3039 final ResultInfo castInfo;
3040 JCExpression expr = TreeInfo.skipParens(tree.expr);
3041 boolean isPoly = expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE);
3042 if (isPoly) {
3043 //expression is a poly - we need to propagate target type info
3044 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3045 @Override
3046 public boolean compatible(Type found, Type req, Warner warn) {
3047 return types.isCastable(found, req, warn);
3048 }
3049 });
3050 } else {
3051 //standalone cast - target-type info is not propagated
3052 castInfo = unknownExprInfo;
3053 }
3054 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3055 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3056 if (exprtype.constValue() != null)
3057 owntype = cfolder.coerce(exprtype, owntype);
3058 result = check(tree, capture(owntype), VAL, resultInfo);
3059 if (!isPoly)
3060 chk.checkRedundantCast(localEnv, tree);
3061 }
3063 public void visitTypeTest(JCInstanceOf tree) {
3064 Type exprtype = chk.checkNullOrRefType(
3065 tree.expr.pos(), attribExpr(tree.expr, env));
3066 Type clazztype = chk.checkReifiableReferenceType(
3067 tree.clazz.pos(), attribType(tree.clazz, env));
3068 chk.validate(tree.clazz, env, false);
3069 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3070 result = check(tree, syms.booleanType, VAL, resultInfo);
3071 }
3073 public void visitIndexed(JCArrayAccess tree) {
3074 Type owntype = types.createErrorType(tree.type);
3075 Type atype = attribExpr(tree.indexed, env);
3076 attribExpr(tree.index, env, syms.intType);
3077 if (types.isArray(atype))
3078 owntype = types.elemtype(atype);
3079 else if (!atype.hasTag(ERROR))
3080 log.error(tree.pos(), "array.req.but.found", atype);
3081 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3082 result = check(tree, owntype, VAR, resultInfo);
3083 }
3085 public void visitIdent(JCIdent tree) {
3086 Symbol sym;
3088 // Find symbol
3089 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3090 // If we are looking for a method, the prototype `pt' will be a
3091 // method type with the type of the call's arguments as parameters.
3092 env.info.pendingResolutionPhase = null;
3093 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3094 } else if (tree.sym != null && tree.sym.kind != VAR) {
3095 sym = tree.sym;
3096 } else {
3097 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3098 }
3099 tree.sym = sym;
3101 // (1) Also find the environment current for the class where
3102 // sym is defined (`symEnv').
3103 // Only for pre-tiger versions (1.4 and earlier):
3104 // (2) Also determine whether we access symbol out of an anonymous
3105 // class in a this or super call. This is illegal for instance
3106 // members since such classes don't carry a this$n link.
3107 // (`noOuterThisPath').
3108 Env<AttrContext> symEnv = env;
3109 boolean noOuterThisPath = false;
3110 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3111 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3112 sym.owner.kind == TYP &&
3113 tree.name != names._this && tree.name != names._super) {
3115 // Find environment in which identifier is defined.
3116 while (symEnv.outer != null &&
3117 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3118 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3119 noOuterThisPath = !allowAnonOuterThis;
3120 symEnv = symEnv.outer;
3121 }
3122 }
3124 // If symbol is a variable, ...
3125 if (sym.kind == VAR) {
3126 VarSymbol v = (VarSymbol)sym;
3128 // ..., evaluate its initializer, if it has one, and check for
3129 // illegal forward reference.
3130 checkInit(tree, env, v, false);
3132 // If we are expecting a variable (as opposed to a value), check
3133 // that the variable is assignable in the current environment.
3134 if (pkind() == VAR)
3135 checkAssignable(tree.pos(), v, null, env);
3136 }
3138 // In a constructor body,
3139 // if symbol is a field or instance method, check that it is
3140 // not accessed before the supertype constructor is called.
3141 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3142 (sym.kind & (VAR | MTH)) != 0 &&
3143 sym.owner.kind == TYP &&
3144 (sym.flags() & STATIC) == 0) {
3145 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3146 }
3147 Env<AttrContext> env1 = env;
3148 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3149 // If the found symbol is inaccessible, then it is
3150 // accessed through an enclosing instance. Locate this
3151 // enclosing instance:
3152 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3153 env1 = env1.outer;
3154 }
3155 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3156 }
3158 public void visitSelect(JCFieldAccess tree) {
3159 // Determine the expected kind of the qualifier expression.
3160 int skind = 0;
3161 if (tree.name == names._this || tree.name == names._super ||
3162 tree.name == names._class)
3163 {
3164 skind = TYP;
3165 } else {
3166 if ((pkind() & PCK) != 0) skind = skind | PCK;
3167 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3168 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3169 }
3171 // Attribute the qualifier expression, and determine its symbol (if any).
3172 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3173 if ((pkind() & (PCK | TYP)) == 0)
3174 site = capture(site); // Capture field access
3176 // don't allow T.class T[].class, etc
3177 if (skind == TYP) {
3178 Type elt = site;
3179 while (elt.hasTag(ARRAY))
3180 elt = ((ArrayType)elt).elemtype;
3181 if (elt.hasTag(TYPEVAR)) {
3182 log.error(tree.pos(), "type.var.cant.be.deref");
3183 result = types.createErrorType(tree.type);
3184 return;
3185 }
3186 }
3188 // If qualifier symbol is a type or `super', assert `selectSuper'
3189 // for the selection. This is relevant for determining whether
3190 // protected symbols are accessible.
3191 Symbol sitesym = TreeInfo.symbol(tree.selected);
3192 boolean selectSuperPrev = env.info.selectSuper;
3193 env.info.selectSuper =
3194 sitesym != null &&
3195 sitesym.name == names._super;
3197 // Determine the symbol represented by the selection.
3198 env.info.pendingResolutionPhase = null;
3199 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3200 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3201 site = capture(site);
3202 sym = selectSym(tree, sitesym, site, env, resultInfo);
3203 }
3204 boolean varArgs = env.info.lastResolveVarargs();
3205 tree.sym = sym;
3207 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3208 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3209 site = capture(site);
3210 }
3212 // If that symbol is a variable, ...
3213 if (sym.kind == VAR) {
3214 VarSymbol v = (VarSymbol)sym;
3216 // ..., evaluate its initializer, if it has one, and check for
3217 // illegal forward reference.
3218 checkInit(tree, env, v, true);
3220 // If we are expecting a variable (as opposed to a value), check
3221 // that the variable is assignable in the current environment.
3222 if (pkind() == VAR)
3223 checkAssignable(tree.pos(), v, tree.selected, env);
3224 }
3226 if (sitesym != null &&
3227 sitesym.kind == VAR &&
3228 ((VarSymbol)sitesym).isResourceVariable() &&
3229 sym.kind == MTH &&
3230 sym.name.equals(names.close) &&
3231 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3232 env.info.lint.isEnabled(LintCategory.TRY)) {
3233 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3234 }
3236 // Disallow selecting a type from an expression
3237 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3238 tree.type = check(tree.selected, pt(),
3239 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3240 }
3242 if (isType(sitesym)) {
3243 if (sym.name == names._this) {
3244 // If `C' is the currently compiled class, check that
3245 // C.this' does not appear in a call to a super(...)
3246 if (env.info.isSelfCall &&
3247 site.tsym == env.enclClass.sym) {
3248 chk.earlyRefError(tree.pos(), sym);
3249 }
3250 } else {
3251 // Check if type-qualified fields or methods are static (JLS)
3252 if ((sym.flags() & STATIC) == 0 &&
3253 !env.next.tree.hasTag(REFERENCE) &&
3254 sym.name != names._super &&
3255 (sym.kind == VAR || sym.kind == MTH)) {
3256 rs.accessBase(rs.new StaticError(sym),
3257 tree.pos(), site, sym.name, true);
3258 }
3259 }
3260 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3261 // If the qualified item is not a type and the selected item is static, report
3262 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3263 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3264 }
3266 // If we are selecting an instance member via a `super', ...
3267 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3269 // Check that super-qualified symbols are not abstract (JLS)
3270 rs.checkNonAbstract(tree.pos(), sym);
3272 if (site.isRaw()) {
3273 // Determine argument types for site.
3274 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3275 if (site1 != null) site = site1;
3276 }
3277 }
3279 env.info.selectSuper = selectSuperPrev;
3280 result = checkId(tree, site, sym, env, resultInfo);
3281 }
3282 //where
3283 /** Determine symbol referenced by a Select expression,
3284 *
3285 * @param tree The select tree.
3286 * @param site The type of the selected expression,
3287 * @param env The current environment.
3288 * @param resultInfo The current result.
3289 */
3290 private Symbol selectSym(JCFieldAccess tree,
3291 Symbol location,
3292 Type site,
3293 Env<AttrContext> env,
3294 ResultInfo resultInfo) {
3295 DiagnosticPosition pos = tree.pos();
3296 Name name = tree.name;
3297 switch (site.getTag()) {
3298 case PACKAGE:
3299 return rs.accessBase(
3300 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3301 pos, location, site, name, true);
3302 case ARRAY:
3303 case CLASS:
3304 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3305 return rs.resolveQualifiedMethod(
3306 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3307 } else if (name == names._this || name == names._super) {
3308 return rs.resolveSelf(pos, env, site.tsym, name);
3309 } else if (name == names._class) {
3310 // In this case, we have already made sure in
3311 // visitSelect that qualifier expression is a type.
3312 Type t = syms.classType;
3313 List<Type> typeargs = allowGenerics
3314 ? List.of(types.erasure(site))
3315 : List.<Type>nil();
3316 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3317 return new VarSymbol(
3318 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3319 } else {
3320 // We are seeing a plain identifier as selector.
3321 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3322 if ((resultInfo.pkind & ERRONEOUS) == 0)
3323 sym = rs.accessBase(sym, pos, location, site, name, true);
3324 return sym;
3325 }
3326 case WILDCARD:
3327 throw new AssertionError(tree);
3328 case TYPEVAR:
3329 // Normally, site.getUpperBound() shouldn't be null.
3330 // It should only happen during memberEnter/attribBase
3331 // when determining the super type which *must* beac
3332 // done before attributing the type variables. In
3333 // other words, we are seeing this illegal program:
3334 // class B<T> extends A<T.foo> {}
3335 Symbol sym = (site.getUpperBound() != null)
3336 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3337 : null;
3338 if (sym == null) {
3339 log.error(pos, "type.var.cant.be.deref");
3340 return syms.errSymbol;
3341 } else {
3342 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3343 rs.new AccessError(env, site, sym) :
3344 sym;
3345 rs.accessBase(sym2, pos, location, site, name, true);
3346 return sym;
3347 }
3348 case ERROR:
3349 // preserve identifier names through errors
3350 return types.createErrorType(name, site.tsym, site).tsym;
3351 default:
3352 // The qualifier expression is of a primitive type -- only
3353 // .class is allowed for these.
3354 if (name == names._class) {
3355 // In this case, we have already made sure in Select that
3356 // qualifier expression is a type.
3357 Type t = syms.classType;
3358 Type arg = types.boxedClass(site).type;
3359 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3360 return new VarSymbol(
3361 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3362 } else {
3363 log.error(pos, "cant.deref", site);
3364 return syms.errSymbol;
3365 }
3366 }
3367 }
3369 /** Determine type of identifier or select expression and check that
3370 * (1) the referenced symbol is not deprecated
3371 * (2) the symbol's type is safe (@see checkSafe)
3372 * (3) if symbol is a variable, check that its type and kind are
3373 * compatible with the prototype and protokind.
3374 * (4) if symbol is an instance field of a raw type,
3375 * which is being assigned to, issue an unchecked warning if its
3376 * type changes under erasure.
3377 * (5) if symbol is an instance method of a raw type, issue an
3378 * unchecked warning if its argument types change under erasure.
3379 * If checks succeed:
3380 * If symbol is a constant, return its constant type
3381 * else if symbol is a method, return its result type
3382 * otherwise return its type.
3383 * Otherwise return errType.
3384 *
3385 * @param tree The syntax tree representing the identifier
3386 * @param site If this is a select, the type of the selected
3387 * expression, otherwise the type of the current class.
3388 * @param sym The symbol representing the identifier.
3389 * @param env The current environment.
3390 * @param resultInfo The expected result
3391 */
3392 Type checkId(JCTree tree,
3393 Type site,
3394 Symbol sym,
3395 Env<AttrContext> env,
3396 ResultInfo resultInfo) {
3397 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3398 checkMethodId(tree, site, sym, env, resultInfo) :
3399 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3400 }
3402 Type checkMethodId(JCTree tree,
3403 Type site,
3404 Symbol sym,
3405 Env<AttrContext> env,
3406 ResultInfo resultInfo) {
3407 boolean isPolymorhicSignature =
3408 sym.kind == MTH && ((MethodSymbol)sym.baseSymbol()).isSignaturePolymorphic(types);
3409 return isPolymorhicSignature ?
3410 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3411 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3412 }
3414 Type checkSigPolyMethodId(JCTree tree,
3415 Type site,
3416 Symbol sym,
3417 Env<AttrContext> env,
3418 ResultInfo resultInfo) {
3419 //recover original symbol for signature polymorphic methods
3420 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3421 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3422 return sym.type;
3423 }
3425 Type checkMethodIdInternal(JCTree tree,
3426 Type site,
3427 Symbol sym,
3428 Env<AttrContext> env,
3429 ResultInfo resultInfo) {
3430 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3431 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3432 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3433 return owntype;
3434 }
3436 Type checkIdInternal(JCTree tree,
3437 Type site,
3438 Symbol sym,
3439 Type pt,
3440 Env<AttrContext> env,
3441 ResultInfo resultInfo) {
3442 if (pt.isErroneous()) {
3443 return types.createErrorType(site);
3444 }
3445 Type owntype; // The computed type of this identifier occurrence.
3446 switch (sym.kind) {
3447 case TYP:
3448 // For types, the computed type equals the symbol's type,
3449 // except for two situations:
3450 owntype = sym.type;
3451 if (owntype.hasTag(CLASS)) {
3452 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3453 Type ownOuter = owntype.getEnclosingType();
3455 // (a) If the symbol's type is parameterized, erase it
3456 // because no type parameters were given.
3457 // We recover generic outer type later in visitTypeApply.
3458 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3459 owntype = types.erasure(owntype);
3460 }
3462 // (b) If the symbol's type is an inner class, then
3463 // we have to interpret its outer type as a superclass
3464 // of the site type. Example:
3465 //
3466 // class Tree<A> { class Visitor { ... } }
3467 // class PointTree extends Tree<Point> { ... }
3468 // ...PointTree.Visitor...
3469 //
3470 // Then the type of the last expression above is
3471 // Tree<Point>.Visitor.
3472 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3473 Type normOuter = site;
3474 if (normOuter.hasTag(CLASS)) {
3475 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3476 if (site.isAnnotated()) {
3477 // Propagate any type annotations.
3478 // TODO: should asEnclosingSuper do this?
3479 // Note that the type annotations in site will be updated
3480 // by annotateType. Therefore, modify site instead
3481 // of creating a new AnnotatedType.
3482 ((AnnotatedType)site).underlyingType = normOuter;
3483 normOuter = site;
3484 }
3485 }
3486 if (normOuter == null) // perhaps from an import
3487 normOuter = types.erasure(ownOuter);
3488 if (normOuter != ownOuter)
3489 owntype = new ClassType(
3490 normOuter, List.<Type>nil(), owntype.tsym);
3491 }
3492 }
3493 break;
3494 case VAR:
3495 VarSymbol v = (VarSymbol)sym;
3496 // Test (4): if symbol is an instance field of a raw type,
3497 // which is being assigned to, issue an unchecked warning if
3498 // its type changes under erasure.
3499 if (allowGenerics &&
3500 resultInfo.pkind == VAR &&
3501 v.owner.kind == TYP &&
3502 (v.flags() & STATIC) == 0 &&
3503 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3504 Type s = types.asOuterSuper(site, v.owner);
3505 if (s != null &&
3506 s.isRaw() &&
3507 !types.isSameType(v.type, v.erasure(types))) {
3508 chk.warnUnchecked(tree.pos(),
3509 "unchecked.assign.to.var",
3510 v, s);
3511 }
3512 }
3513 // The computed type of a variable is the type of the
3514 // variable symbol, taken as a member of the site type.
3515 owntype = (sym.owner.kind == TYP &&
3516 sym.name != names._this && sym.name != names._super)
3517 ? types.memberType(site, sym)
3518 : sym.type;
3520 // If the variable is a constant, record constant value in
3521 // computed type.
3522 if (v.getConstValue() != null && isStaticReference(tree))
3523 owntype = owntype.constType(v.getConstValue());
3525 if (resultInfo.pkind == VAL) {
3526 owntype = capture(owntype); // capture "names as expressions"
3527 }
3528 break;
3529 case MTH: {
3530 owntype = checkMethod(site, sym,
3531 new ResultInfo(VAL, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3532 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3533 resultInfo.pt.getTypeArguments());
3534 break;
3535 }
3536 case PCK: case ERR:
3537 owntype = sym.type;
3538 break;
3539 default:
3540 throw new AssertionError("unexpected kind: " + sym.kind +
3541 " in tree " + tree);
3542 }
3544 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3545 // (for constructors, the error was given when the constructor was
3546 // resolved)
3548 if (sym.name != names.init) {
3549 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3550 chk.checkSunAPI(tree.pos(), sym);
3551 chk.checkProfile(tree.pos(), sym);
3552 }
3554 // Test (3): if symbol is a variable, check that its type and
3555 // kind are compatible with the prototype and protokind.
3556 return check(tree, owntype, sym.kind, resultInfo);
3557 }
3559 /** Check that variable is initialized and evaluate the variable's
3560 * initializer, if not yet done. Also check that variable is not
3561 * referenced before it is defined.
3562 * @param tree The tree making up the variable reference.
3563 * @param env The current environment.
3564 * @param v The variable's symbol.
3565 */
3566 private void checkInit(JCTree tree,
3567 Env<AttrContext> env,
3568 VarSymbol v,
3569 boolean onlyWarning) {
3570 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3571 // tree.pos + " " + v.pos + " " +
3572 // Resolve.isStatic(env));//DEBUG
3574 // A forward reference is diagnosed if the declaration position
3575 // of the variable is greater than the current tree position
3576 // and the tree and variable definition occur in the same class
3577 // definition. Note that writes don't count as references.
3578 // This check applies only to class and instance
3579 // variables. Local variables follow different scope rules,
3580 // and are subject to definite assignment checking.
3581 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3582 v.owner.kind == TYP &&
3583 canOwnInitializer(owner(env)) &&
3584 v.owner == env.info.scope.owner.enclClass() &&
3585 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3586 (!env.tree.hasTag(ASSIGN) ||
3587 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3588 String suffix = (env.info.enclVar == v) ?
3589 "self.ref" : "forward.ref";
3590 if (!onlyWarning || isStaticEnumField(v)) {
3591 log.error(tree.pos(), "illegal." + suffix);
3592 } else if (useBeforeDeclarationWarning) {
3593 log.warning(tree.pos(), suffix, v);
3594 }
3595 }
3597 v.getConstValue(); // ensure initializer is evaluated
3599 checkEnumInitializer(tree, env, v);
3600 }
3602 /**
3603 * Check for illegal references to static members of enum. In
3604 * an enum type, constructors and initializers may not
3605 * reference its static members unless they are constant.
3606 *
3607 * @param tree The tree making up the variable reference.
3608 * @param env The current environment.
3609 * @param v The variable's symbol.
3610 * @jls section 8.9 Enums
3611 */
3612 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3613 // JLS:
3614 //
3615 // "It is a compile-time error to reference a static field
3616 // of an enum type that is not a compile-time constant
3617 // (15.28) from constructors, instance initializer blocks,
3618 // or instance variable initializer expressions of that
3619 // type. It is a compile-time error for the constructors,
3620 // instance initializer blocks, or instance variable
3621 // initializer expressions of an enum constant e to refer
3622 // to itself or to an enum constant of the same type that
3623 // is declared to the right of e."
3624 if (isStaticEnumField(v)) {
3625 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3627 if (enclClass == null || enclClass.owner == null)
3628 return;
3630 // See if the enclosing class is the enum (or a
3631 // subclass thereof) declaring v. If not, this
3632 // reference is OK.
3633 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3634 return;
3636 // If the reference isn't from an initializer, then
3637 // the reference is OK.
3638 if (!Resolve.isInitializer(env))
3639 return;
3641 log.error(tree.pos(), "illegal.enum.static.ref");
3642 }
3643 }
3645 /** Is the given symbol a static, non-constant field of an Enum?
3646 * Note: enum literals should not be regarded as such
3647 */
3648 private boolean isStaticEnumField(VarSymbol v) {
3649 return Flags.isEnum(v.owner) &&
3650 Flags.isStatic(v) &&
3651 !Flags.isConstant(v) &&
3652 v.name != names._class;
3653 }
3655 /** Can the given symbol be the owner of code which forms part
3656 * if class initialization? This is the case if the symbol is
3657 * a type or field, or if the symbol is the synthetic method.
3658 * owning a block.
3659 */
3660 private boolean canOwnInitializer(Symbol sym) {
3661 return
3662 (sym.kind & (VAR | TYP)) != 0 ||
3663 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3664 }
3666 Warner noteWarner = new Warner();
3668 /**
3669 * Check that method arguments conform to its instantiation.
3670 **/
3671 public Type checkMethod(Type site,
3672 Symbol sym,
3673 ResultInfo resultInfo,
3674 Env<AttrContext> env,
3675 final List<JCExpression> argtrees,
3676 List<Type> argtypes,
3677 List<Type> typeargtypes) {
3678 // Test (5): if symbol is an instance method of a raw type, issue
3679 // an unchecked warning if its argument types change under erasure.
3680 if (allowGenerics &&
3681 (sym.flags() & STATIC) == 0 &&
3682 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3683 Type s = types.asOuterSuper(site, sym.owner);
3684 if (s != null && s.isRaw() &&
3685 !types.isSameTypes(sym.type.getParameterTypes(),
3686 sym.erasure(types).getParameterTypes())) {
3687 chk.warnUnchecked(env.tree.pos(),
3688 "unchecked.call.mbr.of.raw.type",
3689 sym, s);
3690 }
3691 }
3693 if (env.info.defaultSuperCallSite != null) {
3694 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3695 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3696 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3697 List<MethodSymbol> icand_sup =
3698 types.interfaceCandidates(sup, (MethodSymbol)sym);
3699 if (icand_sup.nonEmpty() &&
3700 icand_sup.head != sym &&
3701 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3702 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3703 diags.fragment("overridden.default", sym, sup));
3704 break;
3705 }
3706 }
3707 env.info.defaultSuperCallSite = null;
3708 }
3710 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3711 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3712 if (app.meth.hasTag(SELECT) &&
3713 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3714 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3715 }
3716 }
3718 // Compute the identifier's instantiated type.
3719 // For methods, we need to compute the instance type by
3720 // Resolve.instantiate from the symbol's type as well as
3721 // any type arguments and value arguments.
3722 noteWarner.clear();
3723 try {
3724 Type owntype = rs.checkMethod(
3725 env,
3726 site,
3727 sym,
3728 resultInfo,
3729 argtypes,
3730 typeargtypes,
3731 noteWarner);
3733 DeferredAttr.DeferredTypeMap checkDeferredMap =
3734 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3736 argtypes = Type.map(argtypes, checkDeferredMap);
3738 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3739 chk.warnUnchecked(env.tree.pos(),
3740 "unchecked.meth.invocation.applied",
3741 kindName(sym),
3742 sym.name,
3743 rs.methodArguments(sym.type.getParameterTypes()),
3744 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3745 kindName(sym.location()),
3746 sym.location());
3747 owntype = new MethodType(owntype.getParameterTypes(),
3748 types.erasure(owntype.getReturnType()),
3749 types.erasure(owntype.getThrownTypes()),
3750 syms.methodClass);
3751 }
3753 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3754 resultInfo.checkContext.inferenceContext());
3755 } catch (Infer.InferenceException ex) {
3756 //invalid target type - propagate exception outwards or report error
3757 //depending on the current check context
3758 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3759 return types.createErrorType(site);
3760 } catch (Resolve.InapplicableMethodException ex) {
3761 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3762 return null;
3763 }
3764 }
3766 public void visitLiteral(JCLiteral tree) {
3767 result = check(
3768 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3769 }
3770 //where
3771 /** Return the type of a literal with given type tag.
3772 */
3773 Type litType(TypeTag tag) {
3774 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3775 }
3777 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3778 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3779 }
3781 public void visitTypeArray(JCArrayTypeTree tree) {
3782 Type etype = attribType(tree.elemtype, env);
3783 Type type = new ArrayType(etype, syms.arrayClass);
3784 result = check(tree, type, TYP, resultInfo);
3785 }
3787 /** Visitor method for parameterized types.
3788 * Bound checking is left until later, since types are attributed
3789 * before supertype structure is completely known
3790 */
3791 public void visitTypeApply(JCTypeApply tree) {
3792 Type owntype = types.createErrorType(tree.type);
3794 // Attribute functor part of application and make sure it's a class.
3795 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3797 // Attribute type parameters
3798 List<Type> actuals = attribTypes(tree.arguments, env);
3800 if (clazztype.hasTag(CLASS)) {
3801 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3802 if (actuals.isEmpty()) //diamond
3803 actuals = formals;
3805 if (actuals.length() == formals.length()) {
3806 List<Type> a = actuals;
3807 List<Type> f = formals;
3808 while (a.nonEmpty()) {
3809 a.head = a.head.withTypeVar(f.head);
3810 a = a.tail;
3811 f = f.tail;
3812 }
3813 // Compute the proper generic outer
3814 Type clazzOuter = clazztype.getEnclosingType();
3815 if (clazzOuter.hasTag(CLASS)) {
3816 Type site;
3817 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3818 if (clazz.hasTag(IDENT)) {
3819 site = env.enclClass.sym.type;
3820 } else if (clazz.hasTag(SELECT)) {
3821 site = ((JCFieldAccess) clazz).selected.type;
3822 } else throw new AssertionError(""+tree);
3823 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3824 if (site.hasTag(CLASS))
3825 site = types.asOuterSuper(site, clazzOuter.tsym);
3826 if (site == null)
3827 site = types.erasure(clazzOuter);
3828 clazzOuter = site;
3829 }
3830 }
3831 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3832 if (clazztype.isAnnotated()) {
3833 // Use the same AnnotatedType, because it will have
3834 // its annotations set later.
3835 ((AnnotatedType)clazztype).underlyingType = owntype;
3836 owntype = clazztype;
3837 }
3838 } else {
3839 if (formals.length() != 0) {
3840 log.error(tree.pos(), "wrong.number.type.args",
3841 Integer.toString(formals.length()));
3842 } else {
3843 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3844 }
3845 owntype = types.createErrorType(tree.type);
3846 }
3847 }
3848 result = check(tree, owntype, TYP, resultInfo);
3849 }
3851 public void visitTypeUnion(JCTypeUnion tree) {
3852 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3853 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3854 for (JCExpression typeTree : tree.alternatives) {
3855 Type ctype = attribType(typeTree, env);
3856 ctype = chk.checkType(typeTree.pos(),
3857 chk.checkClassType(typeTree.pos(), ctype),
3858 syms.throwableType);
3859 if (!ctype.isErroneous()) {
3860 //check that alternatives of a union type are pairwise
3861 //unrelated w.r.t. subtyping
3862 if (chk.intersects(ctype, multicatchTypes.toList())) {
3863 for (Type t : multicatchTypes) {
3864 boolean sub = types.isSubtype(ctype, t);
3865 boolean sup = types.isSubtype(t, ctype);
3866 if (sub || sup) {
3867 //assume 'a' <: 'b'
3868 Type a = sub ? ctype : t;
3869 Type b = sub ? t : ctype;
3870 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3871 }
3872 }
3873 }
3874 multicatchTypes.append(ctype);
3875 if (all_multicatchTypes != null)
3876 all_multicatchTypes.append(ctype);
3877 } else {
3878 if (all_multicatchTypes == null) {
3879 all_multicatchTypes = ListBuffer.lb();
3880 all_multicatchTypes.appendList(multicatchTypes);
3881 }
3882 all_multicatchTypes.append(ctype);
3883 }
3884 }
3885 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3886 if (t.hasTag(CLASS)) {
3887 List<Type> alternatives =
3888 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3889 t = new UnionClassType((ClassType) t, alternatives);
3890 }
3891 tree.type = result = t;
3892 }
3894 public void visitTypeIntersection(JCTypeIntersection tree) {
3895 attribTypes(tree.bounds, env);
3896 tree.type = result = checkIntersection(tree, tree.bounds);
3897 }
3899 public void visitTypeParameter(JCTypeParameter tree) {
3900 TypeVar typeVar = (TypeVar) tree.type;
3902 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3903 AnnotatedType antype = new AnnotatedType(typeVar);
3904 annotateType(antype, tree.annotations);
3905 tree.type = antype;
3906 }
3908 if (!typeVar.bound.isErroneous()) {
3909 //fixup type-parameter bound computed in 'attribTypeVariables'
3910 typeVar.bound = checkIntersection(tree, tree.bounds);
3911 }
3912 }
3914 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3915 Set<Type> boundSet = new HashSet<Type>();
3916 if (bounds.nonEmpty()) {
3917 // accept class or interface or typevar as first bound.
3918 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3919 boundSet.add(types.erasure(bounds.head.type));
3920 if (bounds.head.type.isErroneous()) {
3921 return bounds.head.type;
3922 }
3923 else if (bounds.head.type.hasTag(TYPEVAR)) {
3924 // if first bound was a typevar, do not accept further bounds.
3925 if (bounds.tail.nonEmpty()) {
3926 log.error(bounds.tail.head.pos(),
3927 "type.var.may.not.be.followed.by.other.bounds");
3928 return bounds.head.type;
3929 }
3930 } else {
3931 // if first bound was a class or interface, accept only interfaces
3932 // as further bounds.
3933 for (JCExpression bound : bounds.tail) {
3934 bound.type = checkBase(bound.type, bound, env, false, true, false);
3935 if (bound.type.isErroneous()) {
3936 bounds = List.of(bound);
3937 }
3938 else if (bound.type.hasTag(CLASS)) {
3939 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3940 }
3941 }
3942 }
3943 }
3945 if (bounds.length() == 0) {
3946 return syms.objectType;
3947 } else if (bounds.length() == 1) {
3948 return bounds.head.type;
3949 } else {
3950 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3951 if (tree.hasTag(TYPEINTERSECTION)) {
3952 ((IntersectionClassType)owntype).intersectionKind =
3953 IntersectionClassType.IntersectionKind.EXPLICIT;
3954 }
3955 // ... the variable's bound is a class type flagged COMPOUND
3956 // (see comment for TypeVar.bound).
3957 // In this case, generate a class tree that represents the
3958 // bound class, ...
3959 JCExpression extending;
3960 List<JCExpression> implementing;
3961 if (!bounds.head.type.isInterface()) {
3962 extending = bounds.head;
3963 implementing = bounds.tail;
3964 } else {
3965 extending = null;
3966 implementing = bounds;
3967 }
3968 JCClassDecl cd = make.at(tree).ClassDef(
3969 make.Modifiers(PUBLIC | ABSTRACT),
3970 names.empty, List.<JCTypeParameter>nil(),
3971 extending, implementing, List.<JCTree>nil());
3973 ClassSymbol c = (ClassSymbol)owntype.tsym;
3974 Assert.check((c.flags() & COMPOUND) != 0);
3975 cd.sym = c;
3976 c.sourcefile = env.toplevel.sourcefile;
3978 // ... and attribute the bound class
3979 c.flags_field |= UNATTRIBUTED;
3980 Env<AttrContext> cenv = enter.classEnv(cd, env);
3981 enter.typeEnvs.put(c, cenv);
3982 attribClass(c);
3983 return owntype;
3984 }
3985 }
3987 public void visitWildcard(JCWildcard tree) {
3988 //- System.err.println("visitWildcard("+tree+");");//DEBUG
3989 Type type = (tree.kind.kind == BoundKind.UNBOUND)
3990 ? syms.objectType
3991 : attribType(tree.inner, env);
3992 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
3993 tree.kind.kind,
3994 syms.boundClass),
3995 TYP, resultInfo);
3996 }
3998 public void visitAnnotation(JCAnnotation tree) {
3999 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
4000 result = tree.type = syms.errType;
4001 }
4003 public void visitAnnotatedType(JCAnnotatedType tree) {
4004 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4005 this.attribAnnotationTypes(tree.annotations, env);
4006 AnnotatedType antype = new AnnotatedType(underlyingType);
4007 annotateType(antype, tree.annotations);
4008 result = tree.type = antype;
4009 }
4011 /**
4012 * Apply the annotations to the particular type.
4013 */
4014 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
4015 if (annotations.isEmpty())
4016 return;
4017 annotate.typeAnnotation(new Annotate.Annotator() {
4018 @Override
4019 public String toString() {
4020 return "annotate " + annotations + " onto " + type;
4021 }
4022 @Override
4023 public void enterAnnotation() {
4024 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4025 type.typeAnnotations = compounds;
4026 }
4027 });
4028 }
4030 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4031 if (annotations.isEmpty())
4032 return List.nil();
4034 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
4035 for (JCAnnotation anno : annotations) {
4036 if (anno.attribute != null) {
4037 // TODO: this null-check is only needed for an obscure
4038 // ordering issue, where annotate.flush is called when
4039 // the attribute is not set yet. For an example failure
4040 // try the referenceinfos/NestedTypes.java test.
4041 // Any better solutions?
4042 buf.append((Attribute.TypeCompound) anno.attribute);
4043 }
4044 }
4045 return buf.toList();
4046 }
4048 public void visitErroneous(JCErroneous tree) {
4049 if (tree.errs != null)
4050 for (JCTree err : tree.errs)
4051 attribTree(err, env, new ResultInfo(ERR, pt()));
4052 result = tree.type = syms.errType;
4053 }
4055 /** Default visitor method for all other trees.
4056 */
4057 public void visitTree(JCTree tree) {
4058 throw new AssertionError();
4059 }
4061 /**
4062 * Attribute an env for either a top level tree or class declaration.
4063 */
4064 public void attrib(Env<AttrContext> env) {
4065 if (env.tree.hasTag(TOPLEVEL))
4066 attribTopLevel(env);
4067 else
4068 attribClass(env.tree.pos(), env.enclClass.sym);
4069 }
4071 /**
4072 * Attribute a top level tree. These trees are encountered when the
4073 * package declaration has annotations.
4074 */
4075 public void attribTopLevel(Env<AttrContext> env) {
4076 JCCompilationUnit toplevel = env.toplevel;
4077 try {
4078 annotate.flush();
4079 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
4080 } catch (CompletionFailure ex) {
4081 chk.completionError(toplevel.pos(), ex);
4082 }
4083 }
4085 /** Main method: attribute class definition associated with given class symbol.
4086 * reporting completion failures at the given position.
4087 * @param pos The source position at which completion errors are to be
4088 * reported.
4089 * @param c The class symbol whose definition will be attributed.
4090 */
4091 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4092 try {
4093 annotate.flush();
4094 attribClass(c);
4095 } catch (CompletionFailure ex) {
4096 chk.completionError(pos, ex);
4097 }
4098 }
4100 /** Attribute class definition associated with given class symbol.
4101 * @param c The class symbol whose definition will be attributed.
4102 */
4103 void attribClass(ClassSymbol c) throws CompletionFailure {
4104 if (c.type.hasTag(ERROR)) return;
4106 // Check for cycles in the inheritance graph, which can arise from
4107 // ill-formed class files.
4108 chk.checkNonCyclic(null, c.type);
4110 Type st = types.supertype(c.type);
4111 if ((c.flags_field & Flags.COMPOUND) == 0) {
4112 // First, attribute superclass.
4113 if (st.hasTag(CLASS))
4114 attribClass((ClassSymbol)st.tsym);
4116 // Next attribute owner, if it is a class.
4117 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4118 attribClass((ClassSymbol)c.owner);
4119 }
4121 // The previous operations might have attributed the current class
4122 // if there was a cycle. So we test first whether the class is still
4123 // UNATTRIBUTED.
4124 if ((c.flags_field & UNATTRIBUTED) != 0) {
4125 c.flags_field &= ~UNATTRIBUTED;
4127 // Get environment current at the point of class definition.
4128 Env<AttrContext> env = enter.typeEnvs.get(c);
4130 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4131 // because the annotations were not available at the time the env was created. Therefore,
4132 // we look up the environment chain for the first enclosing environment for which the
4133 // lint value is set. Typically, this is the parent env, but might be further if there
4134 // are any envs created as a result of TypeParameter nodes.
4135 Env<AttrContext> lintEnv = env;
4136 while (lintEnv.info.lint == null)
4137 lintEnv = lintEnv.next;
4139 // Having found the enclosing lint value, we can initialize the lint value for this class
4140 env.info.lint = lintEnv.info.lint.augment(c);
4142 Lint prevLint = chk.setLint(env.info.lint);
4143 JavaFileObject prev = log.useSource(c.sourcefile);
4144 ResultInfo prevReturnRes = env.info.returnResult;
4146 try {
4147 env.info.returnResult = null;
4148 // java.lang.Enum may not be subclassed by a non-enum
4149 if (st.tsym == syms.enumSym &&
4150 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4151 log.error(env.tree.pos(), "enum.no.subclassing");
4153 // Enums may not be extended by source-level classes
4154 if (st.tsym != null &&
4155 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4156 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4157 log.error(env.tree.pos(), "enum.types.not.extensible");
4158 }
4159 attribClassBody(env, c);
4161 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4162 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4163 } finally {
4164 env.info.returnResult = prevReturnRes;
4165 log.useSource(prev);
4166 chk.setLint(prevLint);
4167 }
4169 }
4170 }
4172 public void visitImport(JCImport tree) {
4173 // nothing to do
4174 }
4176 /** Finish the attribution of a class. */
4177 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4178 JCClassDecl tree = (JCClassDecl)env.tree;
4179 Assert.check(c == tree.sym);
4181 // Validate annotations
4182 chk.validateAnnotations(tree.mods.annotations, c);
4184 // Validate type parameters, supertype and interfaces.
4185 attribStats(tree.typarams, env);
4186 if (!c.isAnonymous()) {
4187 //already checked if anonymous
4188 chk.validate(tree.typarams, env);
4189 chk.validate(tree.extending, env);
4190 chk.validate(tree.implementing, env);
4191 }
4193 // If this is a non-abstract class, check that it has no abstract
4194 // methods or unimplemented methods of an implemented interface.
4195 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4196 if (!relax)
4197 chk.checkAllDefined(tree.pos(), c);
4198 }
4200 if ((c.flags() & ANNOTATION) != 0) {
4201 if (tree.implementing.nonEmpty())
4202 log.error(tree.implementing.head.pos(),
4203 "cant.extend.intf.annotation");
4204 if (tree.typarams.nonEmpty())
4205 log.error(tree.typarams.head.pos(),
4206 "intf.annotation.cant.have.type.params");
4208 // If this annotation has a @Repeatable, validate
4209 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4210 if (repeatable != null) {
4211 // get diagnostic position for error reporting
4212 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4213 Assert.checkNonNull(cbPos);
4215 chk.validateRepeatable(c, repeatable, cbPos);
4216 }
4217 } else {
4218 // Check that all extended classes and interfaces
4219 // are compatible (i.e. no two define methods with same arguments
4220 // yet different return types). (JLS 8.4.6.3)
4221 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4222 if (allowDefaultMethods) {
4223 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4224 }
4225 }
4227 // Check that class does not import the same parameterized interface
4228 // with two different argument lists.
4229 chk.checkClassBounds(tree.pos(), c.type);
4231 tree.type = c.type;
4233 for (List<JCTypeParameter> l = tree.typarams;
4234 l.nonEmpty(); l = l.tail) {
4235 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4236 }
4238 // Check that a generic class doesn't extend Throwable
4239 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4240 log.error(tree.extending.pos(), "generic.throwable");
4242 // Check that all methods which implement some
4243 // method conform to the method they implement.
4244 chk.checkImplementations(tree);
4246 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4247 checkAutoCloseable(tree.pos(), env, c.type);
4249 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4250 // Attribute declaration
4251 attribStat(l.head, env);
4252 // Check that declarations in inner classes are not static (JLS 8.1.2)
4253 // Make an exception for static constants.
4254 if (c.owner.kind != PCK &&
4255 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4256 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4257 Symbol sym = null;
4258 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4259 if (sym == null ||
4260 sym.kind != VAR ||
4261 ((VarSymbol) sym).getConstValue() == null)
4262 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4263 }
4264 }
4266 // Check for cycles among non-initial constructors.
4267 chk.checkCyclicConstructors(tree);
4269 // Check for cycles among annotation elements.
4270 chk.checkNonCyclicElements(tree);
4272 // Check for proper use of serialVersionUID
4273 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4274 isSerializable(c) &&
4275 (c.flags() & Flags.ENUM) == 0 &&
4276 (c.flags() & ABSTRACT) == 0) {
4277 checkSerialVersionUID(tree, c);
4278 }
4280 // Correctly organize the postions of the type annotations
4281 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4283 // Check type annotations applicability rules
4284 validateTypeAnnotations(tree);
4285 }
4286 // where
4287 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4288 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4289 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4290 if (types.isSameType(al.head.annotationType.type, t))
4291 return al.head.pos();
4292 }
4294 return null;
4295 }
4297 /** check if a class is a subtype of Serializable, if that is available. */
4298 private boolean isSerializable(ClassSymbol c) {
4299 try {
4300 syms.serializableType.complete();
4301 }
4302 catch (CompletionFailure e) {
4303 return false;
4304 }
4305 return types.isSubtype(c.type, syms.serializableType);
4306 }
4308 /** Check that an appropriate serialVersionUID member is defined. */
4309 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4311 // check for presence of serialVersionUID
4312 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4313 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4314 if (e.scope == null) {
4315 log.warning(LintCategory.SERIAL,
4316 tree.pos(), "missing.SVUID", c);
4317 return;
4318 }
4320 // check that it is static final
4321 VarSymbol svuid = (VarSymbol)e.sym;
4322 if ((svuid.flags() & (STATIC | FINAL)) !=
4323 (STATIC | FINAL))
4324 log.warning(LintCategory.SERIAL,
4325 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4327 // check that it is long
4328 else if (!svuid.type.hasTag(LONG))
4329 log.warning(LintCategory.SERIAL,
4330 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4332 // check constant
4333 else if (svuid.getConstValue() == null)
4334 log.warning(LintCategory.SERIAL,
4335 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4336 }
4338 private Type capture(Type type) {
4339 //do not capture free types
4340 return resultInfo.checkContext.inferenceContext().free(type) ?
4341 type : types.capture(type);
4342 }
4344 private void validateTypeAnnotations(JCTree tree) {
4345 tree.accept(typeAnnotationsValidator);
4346 }
4347 //where
4348 private final JCTree.Visitor typeAnnotationsValidator = new TreeScanner() {
4350 private boolean checkAllAnnotations = false;
4352 public void visitAnnotation(JCAnnotation tree) {
4353 if (tree.hasTag(TYPE_ANNOTATION) || checkAllAnnotations) {
4354 chk.validateTypeAnnotation(tree, false);
4355 }
4356 super.visitAnnotation(tree);
4357 }
4358 public void visitTypeParameter(JCTypeParameter tree) {
4359 chk.validateTypeAnnotations(tree.annotations, true);
4360 scan(tree.bounds);
4361 // Don't call super.
4362 // This is needed because above we call validateTypeAnnotation with
4363 // false, which would forbid annotations on type parameters.
4364 // super.visitTypeParameter(tree);
4365 }
4366 public void visitMethodDef(JCMethodDecl tree) {
4367 if (tree.recvparam != null &&
4368 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4369 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4370 tree.recvparam.vartype.type.tsym);
4371 }
4372 if (tree.restype != null && tree.restype.type != null) {
4373 validateAnnotatedType(tree.restype, tree.restype.type);
4374 }
4375 super.visitMethodDef(tree);
4376 }
4377 public void visitVarDef(final JCVariableDecl tree) {
4378 if (tree.sym != null && tree.sym.type != null)
4379 validateAnnotatedType(tree, tree.sym.type);
4380 super.visitVarDef(tree);
4381 }
4382 public void visitTypeCast(JCTypeCast tree) {
4383 if (tree.clazz != null && tree.clazz.type != null)
4384 validateAnnotatedType(tree.clazz, tree.clazz.type);
4385 super.visitTypeCast(tree);
4386 }
4387 public void visitTypeTest(JCInstanceOf tree) {
4388 if (tree.clazz != null && tree.clazz.type != null)
4389 validateAnnotatedType(tree.clazz, tree.clazz.type);
4390 super.visitTypeTest(tree);
4391 }
4392 public void visitNewClass(JCNewClass tree) {
4393 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4394 boolean prevCheck = this.checkAllAnnotations;
4395 try {
4396 this.checkAllAnnotations = true;
4397 scan(((JCAnnotatedType)tree.clazz).annotations);
4398 } finally {
4399 this.checkAllAnnotations = prevCheck;
4400 }
4401 }
4402 super.visitNewClass(tree);
4403 }
4404 public void visitNewArray(JCNewArray tree) {
4405 if (tree.elemtype != null && tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4406 boolean prevCheck = this.checkAllAnnotations;
4407 try {
4408 this.checkAllAnnotations = true;
4409 scan(((JCAnnotatedType)tree.elemtype).annotations);
4410 } finally {
4411 this.checkAllAnnotations = prevCheck;
4412 }
4413 }
4414 super.visitNewArray(tree);
4415 }
4417 /* I would want to model this after
4418 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4419 * and override visitSelect and visitTypeApply.
4420 * However, we only set the annotated type in the top-level type
4421 * of the symbol.
4422 * Therefore, we need to override each individual location where a type
4423 * can occur.
4424 */
4425 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4426 if (type.getEnclosingType() != null &&
4427 type != type.getEnclosingType()) {
4428 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4429 }
4430 for (Type targ : type.getTypeArguments()) {
4431 validateAnnotatedType(errtree, targ);
4432 }
4433 }
4434 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4435 validateAnnotatedType(errtree, type);
4436 if (type.tsym != null &&
4437 type.tsym.isStatic() &&
4438 type.getAnnotationMirrors().nonEmpty()) {
4439 // Enclosing static classes cannot have type annotations.
4440 log.error(errtree.pos(), "cant.annotate.static.class");
4441 }
4442 }
4443 };
4445 // <editor-fold desc="post-attribution visitor">
4447 /**
4448 * Handle missing types/symbols in an AST. This routine is useful when
4449 * the compiler has encountered some errors (which might have ended up
4450 * terminating attribution abruptly); if the compiler is used in fail-over
4451 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4452 * prevents NPE to be progagated during subsequent compilation steps.
4453 */
4454 public void postAttr(JCTree tree) {
4455 new PostAttrAnalyzer().scan(tree);
4456 }
4458 class PostAttrAnalyzer extends TreeScanner {
4460 private void initTypeIfNeeded(JCTree that) {
4461 if (that.type == null) {
4462 that.type = syms.unknownType;
4463 }
4464 }
4466 @Override
4467 public void scan(JCTree tree) {
4468 if (tree == null) return;
4469 if (tree instanceof JCExpression) {
4470 initTypeIfNeeded(tree);
4471 }
4472 super.scan(tree);
4473 }
4475 @Override
4476 public void visitIdent(JCIdent that) {
4477 if (that.sym == null) {
4478 that.sym = syms.unknownSymbol;
4479 }
4480 }
4482 @Override
4483 public void visitSelect(JCFieldAccess that) {
4484 if (that.sym == null) {
4485 that.sym = syms.unknownSymbol;
4486 }
4487 super.visitSelect(that);
4488 }
4490 @Override
4491 public void visitClassDef(JCClassDecl that) {
4492 initTypeIfNeeded(that);
4493 if (that.sym == null) {
4494 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4495 }
4496 super.visitClassDef(that);
4497 }
4499 @Override
4500 public void visitMethodDef(JCMethodDecl that) {
4501 initTypeIfNeeded(that);
4502 if (that.sym == null) {
4503 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4504 }
4505 super.visitMethodDef(that);
4506 }
4508 @Override
4509 public void visitVarDef(JCVariableDecl that) {
4510 initTypeIfNeeded(that);
4511 if (that.sym == null) {
4512 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4513 that.sym.adr = 0;
4514 }
4515 super.visitVarDef(that);
4516 }
4518 @Override
4519 public void visitNewClass(JCNewClass that) {
4520 if (that.constructor == null) {
4521 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4522 }
4523 if (that.constructorType == null) {
4524 that.constructorType = syms.unknownType;
4525 }
4526 super.visitNewClass(that);
4527 }
4529 @Override
4530 public void visitAssignop(JCAssignOp that) {
4531 if (that.operator == null)
4532 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4533 super.visitAssignop(that);
4534 }
4536 @Override
4537 public void visitBinary(JCBinary that) {
4538 if (that.operator == null)
4539 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4540 super.visitBinary(that);
4541 }
4543 @Override
4544 public void visitUnary(JCUnary that) {
4545 if (that.operator == null)
4546 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4547 super.visitUnary(that);
4548 }
4550 @Override
4551 public void visitLambda(JCLambda that) {
4552 super.visitLambda(that);
4553 if (that.descriptorType == null) {
4554 that.descriptorType = syms.unknownType;
4555 }
4556 if (that.targets == null) {
4557 that.targets = List.nil();
4558 }
4559 }
4561 @Override
4562 public void visitReference(JCMemberReference that) {
4563 super.visitReference(that);
4564 if (that.sym == null) {
4565 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4566 }
4567 if (that.descriptorType == null) {
4568 that.descriptorType = syms.unknownType;
4569 }
4570 if (that.targets == null) {
4571 that.targets = List.nil();
4572 }
4573 }
4574 }
4575 // </editor-fold>
4576 }
