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src/share/classes/com/sun/tools/javac/comp/Attr.java@14891e981af0
src/share/classes/com/sun/tools/javac/comp/Attr.java
Fri, 21 Aug 2015 13:52:30 +0100
- author
- robm
- date
- Fri, 21 Aug 2015 13:52:30 +0100
- changeset 2904
- 14891e981af0
- parent 2814
- 380f6c17ea01
- child 3001
- dcd12fa5b58a
- permissions
- -rw-r--r--
8071291: Compiler crashes trying to cast UnionType to IntersectionClassType
Reviewed-by: mcimadamore
1 /*
2 * Copyright (c) 1999, 2014, 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.tools.JavaFileObject;
33 import com.sun.source.tree.IdentifierTree;
34 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
35 import com.sun.source.tree.MemberSelectTree;
36 import com.sun.source.tree.TreeVisitor;
37 import com.sun.source.util.SimpleTreeVisitor;
38 import com.sun.tools.javac.code.*;
39 import com.sun.tools.javac.code.Lint.LintCategory;
40 import com.sun.tools.javac.code.Symbol.*;
41 import com.sun.tools.javac.code.Type.*;
42 import com.sun.tools.javac.comp.Check.CheckContext;
43 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
44 import com.sun.tools.javac.comp.Infer.InferenceContext;
45 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
46 import com.sun.tools.javac.jvm.*;
47 import com.sun.tools.javac.tree.*;
48 import com.sun.tools.javac.tree.JCTree.*;
49 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
50 import com.sun.tools.javac.util.*;
51 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
52 import com.sun.tools.javac.util.List;
53 import static com.sun.tools.javac.code.Flags.*;
54 import static com.sun.tools.javac.code.Flags.ANNOTATION;
55 import static com.sun.tools.javac.code.Flags.BLOCK;
56 import static com.sun.tools.javac.code.Kinds.*;
57 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
58 import static com.sun.tools.javac.code.TypeTag.*;
59 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
60 import static com.sun.tools.javac.tree.JCTree.Tag.*;
62 /** This is the main context-dependent analysis phase in GJC. It
63 * encompasses name resolution, type checking and constant folding as
64 * subtasks. Some subtasks involve auxiliary classes.
65 * @see Check
66 * @see Resolve
67 * @see ConstFold
68 * @see Infer
69 *
70 * <p><b>This is NOT part of any supported API.
71 * If you write code that depends on this, you do so at your own risk.
72 * This code and its internal interfaces are subject to change or
73 * deletion without notice.</b>
74 */
75 public class Attr extends JCTree.Visitor {
76 protected static final Context.Key<Attr> attrKey =
77 new Context.Key<Attr>();
79 final Names names;
80 final Log log;
81 final Symtab syms;
82 final Resolve rs;
83 final Infer infer;
84 final DeferredAttr deferredAttr;
85 final Check chk;
86 final Flow flow;
87 final MemberEnter memberEnter;
88 final TreeMaker make;
89 final ConstFold cfolder;
90 final Enter enter;
91 final Target target;
92 final Types types;
93 final JCDiagnostic.Factory diags;
94 final Annotate annotate;
95 final TypeAnnotations typeAnnotations;
96 final DeferredLintHandler deferredLintHandler;
97 final TypeEnvs typeEnvs;
99 public static Attr instance(Context context) {
100 Attr instance = context.get(attrKey);
101 if (instance == null)
102 instance = new Attr(context);
103 return instance;
104 }
106 protected Attr(Context context) {
107 context.put(attrKey, this);
109 names = Names.instance(context);
110 log = Log.instance(context);
111 syms = Symtab.instance(context);
112 rs = Resolve.instance(context);
113 chk = Check.instance(context);
114 flow = Flow.instance(context);
115 memberEnter = MemberEnter.instance(context);
116 make = TreeMaker.instance(context);
117 enter = Enter.instance(context);
118 infer = Infer.instance(context);
119 deferredAttr = DeferredAttr.instance(context);
120 cfolder = ConstFold.instance(context);
121 target = Target.instance(context);
122 types = Types.instance(context);
123 diags = JCDiagnostic.Factory.instance(context);
124 annotate = Annotate.instance(context);
125 typeAnnotations = TypeAnnotations.instance(context);
126 deferredLintHandler = DeferredLintHandler.instance(context);
127 typeEnvs = TypeEnvs.instance(context);
129 Options options = Options.instance(context);
131 Source source = Source.instance(context);
132 allowGenerics = source.allowGenerics();
133 allowVarargs = source.allowVarargs();
134 allowEnums = source.allowEnums();
135 allowBoxing = source.allowBoxing();
136 allowCovariantReturns = source.allowCovariantReturns();
137 allowAnonOuterThis = source.allowAnonOuterThis();
138 allowStringsInSwitch = source.allowStringsInSwitch();
139 allowPoly = source.allowPoly();
140 allowTypeAnnos = source.allowTypeAnnotations();
141 allowLambda = source.allowLambda();
142 allowDefaultMethods = source.allowDefaultMethods();
143 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods();
144 sourceName = source.name;
145 relax = (options.isSet("-retrofit") ||
146 options.isSet("-relax"));
147 findDiamonds = options.get("findDiamond") != null &&
148 source.allowDiamond();
149 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
150 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
152 statInfo = new ResultInfo(NIL, Type.noType);
153 varInfo = new ResultInfo(VAR, Type.noType);
154 unknownExprInfo = new ResultInfo(VAL, Type.noType);
155 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
156 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
157 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
158 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
159 }
161 /** Switch: relax some constraints for retrofit mode.
162 */
163 boolean relax;
165 /** Switch: support target-typing inference
166 */
167 boolean allowPoly;
169 /** Switch: support type annotations.
170 */
171 boolean allowTypeAnnos;
173 /** Switch: support generics?
174 */
175 boolean allowGenerics;
177 /** Switch: allow variable-arity methods.
178 */
179 boolean allowVarargs;
181 /** Switch: support enums?
182 */
183 boolean allowEnums;
185 /** Switch: support boxing and unboxing?
186 */
187 boolean allowBoxing;
189 /** Switch: support covariant result types?
190 */
191 boolean allowCovariantReturns;
193 /** Switch: support lambda expressions ?
194 */
195 boolean allowLambda;
197 /** Switch: support default methods ?
198 */
199 boolean allowDefaultMethods;
201 /** Switch: static interface methods enabled?
202 */
203 boolean allowStaticInterfaceMethods;
205 /** Switch: allow references to surrounding object from anonymous
206 * objects during constructor call?
207 */
208 boolean allowAnonOuterThis;
210 /** Switch: generates a warning if diamond can be safely applied
211 * to a given new expression
212 */
213 boolean findDiamonds;
215 /**
216 * Internally enables/disables diamond finder feature
217 */
218 static final boolean allowDiamondFinder = true;
220 /**
221 * Switch: warn about use of variable before declaration?
222 * RFE: 6425594
223 */
224 boolean useBeforeDeclarationWarning;
226 /**
227 * Switch: generate warnings whenever an anonymous inner class that is convertible
228 * to a lambda expression is found
229 */
230 boolean identifyLambdaCandidate;
232 /**
233 * Switch: allow strings in switch?
234 */
235 boolean allowStringsInSwitch;
237 /**
238 * Switch: name of source level; used for error reporting.
239 */
240 String sourceName;
242 /** Check kind and type of given tree against protokind and prototype.
243 * If check succeeds, store type in tree and return it.
244 * If check fails, store errType in tree and return it.
245 * No checks are performed if the prototype is a method type.
246 * It is not necessary in this case since we know that kind and type
247 * are correct.
248 *
249 * @param tree The tree whose kind and type is checked
250 * @param ownkind The computed kind of the tree
251 * @param resultInfo The expected result of the tree
252 */
253 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
254 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
255 Type owntype;
256 if (!found.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
257 if ((ownkind & ~resultInfo.pkind) != 0) {
258 log.error(tree.pos(), "unexpected.type",
259 kindNames(resultInfo.pkind),
260 kindName(ownkind));
261 owntype = types.createErrorType(found);
262 } else if (allowPoly && inferenceContext.free(found)) {
263 //delay the check if there are inference variables in the found type
264 //this means we are dealing with a partially inferred poly expression
265 owntype = resultInfo.pt;
266 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
267 @Override
268 public void typesInferred(InferenceContext inferenceContext) {
269 ResultInfo pendingResult =
270 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
271 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
272 }
273 });
274 } else {
275 owntype = resultInfo.check(tree, found);
276 }
277 } else {
278 owntype = found;
279 }
280 tree.type = owntype;
281 return owntype;
282 }
284 /** Is given blank final variable assignable, i.e. in a scope where it
285 * may be assigned to even though it is final?
286 * @param v The blank final variable.
287 * @param env The current environment.
288 */
289 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
290 Symbol owner = env.info.scope.owner;
291 // owner refers to the innermost variable, method or
292 // initializer block declaration at this point.
293 return
294 v.owner == owner
295 ||
296 ((owner.name == names.init || // i.e. we are in a constructor
297 owner.kind == VAR || // i.e. we are in a variable initializer
298 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
299 &&
300 v.owner == owner.owner
301 &&
302 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
303 }
305 /** Check that variable can be assigned to.
306 * @param pos The current source code position.
307 * @param v The assigned varaible
308 * @param base If the variable is referred to in a Select, the part
309 * to the left of the `.', null otherwise.
310 * @param env The current environment.
311 */
312 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
313 if ((v.flags() & FINAL) != 0 &&
314 ((v.flags() & HASINIT) != 0
315 ||
316 !((base == null ||
317 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
318 isAssignableAsBlankFinal(v, env)))) {
319 if (v.isResourceVariable()) { //TWR resource
320 log.error(pos, "try.resource.may.not.be.assigned", v);
321 } else {
322 log.error(pos, "cant.assign.val.to.final.var", v);
323 }
324 }
325 }
327 /** Does tree represent a static reference to an identifier?
328 * It is assumed that tree is either a SELECT or an IDENT.
329 * We have to weed out selects from non-type names here.
330 * @param tree The candidate tree.
331 */
332 boolean isStaticReference(JCTree tree) {
333 if (tree.hasTag(SELECT)) {
334 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
335 if (lsym == null || lsym.kind != TYP) {
336 return false;
337 }
338 }
339 return true;
340 }
342 /** Is this symbol a type?
343 */
344 static boolean isType(Symbol sym) {
345 return sym != null && sym.kind == TYP;
346 }
348 /** The current `this' symbol.
349 * @param env The current environment.
350 */
351 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
352 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
353 }
355 /** Attribute a parsed identifier.
356 * @param tree Parsed identifier name
357 * @param topLevel The toplevel to use
358 */
359 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
360 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
361 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
362 syms.errSymbol.name,
363 null, null, null, null);
364 localEnv.enclClass.sym = syms.errSymbol;
365 return tree.accept(identAttributer, localEnv);
366 }
367 // where
368 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
369 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
370 @Override
371 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
372 Symbol site = visit(node.getExpression(), env);
373 if (site.kind == ERR || site.kind == ABSENT_TYP)
374 return site;
375 Name name = (Name)node.getIdentifier();
376 if (site.kind == PCK) {
377 env.toplevel.packge = (PackageSymbol)site;
378 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
379 } else {
380 env.enclClass.sym = (ClassSymbol)site;
381 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
382 }
383 }
385 @Override
386 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
387 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
388 }
389 }
391 public Type coerce(Type etype, Type ttype) {
392 return cfolder.coerce(etype, ttype);
393 }
395 public Type attribType(JCTree node, TypeSymbol sym) {
396 Env<AttrContext> env = typeEnvs.get(sym);
397 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
398 return attribTree(node, localEnv, unknownTypeInfo);
399 }
401 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
402 // Attribute qualifying package or class.
403 JCFieldAccess s = (JCFieldAccess)tree.qualid;
404 return attribTree(s.selected,
405 env,
406 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
407 Type.noType));
408 }
410 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
411 breakTree = tree;
412 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
413 try {
414 attribExpr(expr, env);
415 } catch (BreakAttr b) {
416 return b.env;
417 } catch (AssertionError ae) {
418 if (ae.getCause() instanceof BreakAttr) {
419 return ((BreakAttr)(ae.getCause())).env;
420 } else {
421 throw ae;
422 }
423 } finally {
424 breakTree = null;
425 log.useSource(prev);
426 }
427 return env;
428 }
430 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
431 breakTree = tree;
432 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
433 try {
434 attribStat(stmt, env);
435 } catch (BreakAttr b) {
436 return b.env;
437 } catch (AssertionError ae) {
438 if (ae.getCause() instanceof BreakAttr) {
439 return ((BreakAttr)(ae.getCause())).env;
440 } else {
441 throw ae;
442 }
443 } finally {
444 breakTree = null;
445 log.useSource(prev);
446 }
447 return env;
448 }
450 private JCTree breakTree = null;
452 private static class BreakAttr extends RuntimeException {
453 static final long serialVersionUID = -6924771130405446405L;
454 private Env<AttrContext> env;
455 private BreakAttr(Env<AttrContext> env) {
456 this.env = env;
457 }
458 }
460 class ResultInfo {
461 final int pkind;
462 final Type pt;
463 final CheckContext checkContext;
465 ResultInfo(int pkind, Type pt) {
466 this(pkind, pt, chk.basicHandler);
467 }
469 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
470 this.pkind = pkind;
471 this.pt = pt;
472 this.checkContext = checkContext;
473 }
475 protected Type check(final DiagnosticPosition pos, final Type found) {
476 return chk.checkType(pos, found, pt, checkContext);
477 }
479 protected ResultInfo dup(Type newPt) {
480 return new ResultInfo(pkind, newPt, checkContext);
481 }
483 protected ResultInfo dup(CheckContext newContext) {
484 return new ResultInfo(pkind, pt, newContext);
485 }
487 protected ResultInfo dup(Type newPt, CheckContext newContext) {
488 return new ResultInfo(pkind, newPt, newContext);
489 }
491 @Override
492 public String toString() {
493 if (pt != null) {
494 return pt.toString();
495 } else {
496 return "";
497 }
498 }
499 }
501 class RecoveryInfo extends ResultInfo {
503 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
504 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
505 @Override
506 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
507 return deferredAttrContext;
508 }
509 @Override
510 public boolean compatible(Type found, Type req, Warner warn) {
511 return true;
512 }
513 @Override
514 public void report(DiagnosticPosition pos, JCDiagnostic details) {
515 chk.basicHandler.report(pos, details);
516 }
517 });
518 }
519 }
521 final ResultInfo statInfo;
522 final ResultInfo varInfo;
523 final ResultInfo unknownAnyPolyInfo;
524 final ResultInfo unknownExprInfo;
525 final ResultInfo unknownTypeInfo;
526 final ResultInfo unknownTypeExprInfo;
527 final ResultInfo recoveryInfo;
529 Type pt() {
530 return resultInfo.pt;
531 }
533 int pkind() {
534 return resultInfo.pkind;
535 }
537 /* ************************************************************************
538 * Visitor methods
539 *************************************************************************/
541 /** Visitor argument: the current environment.
542 */
543 Env<AttrContext> env;
545 /** Visitor argument: the currently expected attribution result.
546 */
547 ResultInfo resultInfo;
549 /** Visitor result: the computed type.
550 */
551 Type result;
553 /** Visitor method: attribute a tree, catching any completion failure
554 * exceptions. Return the tree's type.
555 *
556 * @param tree The tree to be visited.
557 * @param env The environment visitor argument.
558 * @param resultInfo The result info visitor argument.
559 */
560 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
561 Env<AttrContext> prevEnv = this.env;
562 ResultInfo prevResult = this.resultInfo;
563 try {
564 this.env = env;
565 this.resultInfo = resultInfo;
566 tree.accept(this);
567 if (tree == breakTree &&
568 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
569 throw new BreakAttr(copyEnv(env));
570 }
571 return result;
572 } catch (CompletionFailure ex) {
573 tree.type = syms.errType;
574 return chk.completionError(tree.pos(), ex);
575 } finally {
576 this.env = prevEnv;
577 this.resultInfo = prevResult;
578 }
579 }
581 Env<AttrContext> copyEnv(Env<AttrContext> env) {
582 Env<AttrContext> newEnv =
583 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
584 if (newEnv.outer != null) {
585 newEnv.outer = copyEnv(newEnv.outer);
586 }
587 return newEnv;
588 }
590 Scope copyScope(Scope sc) {
591 Scope newScope = new Scope(sc.owner);
592 List<Symbol> elemsList = List.nil();
593 while (sc != null) {
594 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
595 elemsList = elemsList.prepend(e.sym);
596 }
597 sc = sc.next;
598 }
599 for (Symbol s : elemsList) {
600 newScope.enter(s);
601 }
602 return newScope;
603 }
605 /** Derived visitor method: attribute an expression tree.
606 */
607 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
608 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
609 }
611 /** Derived visitor method: attribute an expression tree with
612 * no constraints on the computed type.
613 */
614 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
615 return attribTree(tree, env, unknownExprInfo);
616 }
618 /** Derived visitor method: attribute a type tree.
619 */
620 public Type attribType(JCTree tree, Env<AttrContext> env) {
621 Type result = attribType(tree, env, Type.noType);
622 return result;
623 }
625 /** Derived visitor method: attribute a type tree.
626 */
627 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
628 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
629 return result;
630 }
632 /** Derived visitor method: attribute a statement or definition tree.
633 */
634 public Type attribStat(JCTree tree, Env<AttrContext> env) {
635 return attribTree(tree, env, statInfo);
636 }
638 /** Attribute a list of expressions, returning a list of types.
639 */
640 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
641 ListBuffer<Type> ts = new ListBuffer<Type>();
642 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
643 ts.append(attribExpr(l.head, env, pt));
644 return ts.toList();
645 }
647 /** Attribute a list of statements, returning nothing.
648 */
649 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
650 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
651 attribStat(l.head, env);
652 }
654 /** Attribute the arguments in a method call, returning the method kind.
655 */
656 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
657 int kind = VAL;
658 for (JCExpression arg : trees) {
659 Type argtype;
660 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
661 argtype = deferredAttr.new DeferredType(arg, env);
662 kind |= POLY;
663 } else {
664 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
665 }
666 argtypes.append(argtype);
667 }
668 return kind;
669 }
671 /** Attribute a type argument list, returning a list of types.
672 * Caller is responsible for calling checkRefTypes.
673 */
674 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
675 ListBuffer<Type> argtypes = new ListBuffer<Type>();
676 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
677 argtypes.append(attribType(l.head, env));
678 return argtypes.toList();
679 }
681 /** Attribute a type argument list, returning a list of types.
682 * Check that all the types are references.
683 */
684 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
685 List<Type> types = attribAnyTypes(trees, env);
686 return chk.checkRefTypes(trees, types);
687 }
689 /**
690 * Attribute type variables (of generic classes or methods).
691 * Compound types are attributed later in attribBounds.
692 * @param typarams the type variables to enter
693 * @param env the current environment
694 */
695 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
696 for (JCTypeParameter tvar : typarams) {
697 TypeVar a = (TypeVar)tvar.type;
698 a.tsym.flags_field |= UNATTRIBUTED;
699 a.bound = Type.noType;
700 if (!tvar.bounds.isEmpty()) {
701 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
702 for (JCExpression bound : tvar.bounds.tail)
703 bounds = bounds.prepend(attribType(bound, env));
704 types.setBounds(a, bounds.reverse());
705 } else {
706 // if no bounds are given, assume a single bound of
707 // java.lang.Object.
708 types.setBounds(a, List.of(syms.objectType));
709 }
710 a.tsym.flags_field &= ~UNATTRIBUTED;
711 }
712 for (JCTypeParameter tvar : typarams) {
713 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
714 }
715 }
717 /**
718 * Attribute the type references in a list of annotations.
719 */
720 void attribAnnotationTypes(List<JCAnnotation> annotations,
721 Env<AttrContext> env) {
722 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
723 JCAnnotation a = al.head;
724 attribType(a.annotationType, env);
725 }
726 }
728 /**
729 * Attribute a "lazy constant value".
730 * @param env The env for the const value
731 * @param initializer The initializer for the const value
732 * @param type The expected type, or null
733 * @see VarSymbol#setLazyConstValue
734 */
735 public Object attribLazyConstantValue(Env<AttrContext> env,
736 JCVariableDecl variable,
737 Type type) {
739 DiagnosticPosition prevLintPos
740 = deferredLintHandler.setPos(variable.pos());
742 try {
743 // Use null as symbol to not attach the type annotation to any symbol.
744 // The initializer will later also be visited and then we'll attach
745 // to the symbol.
746 // This prevents having multiple type annotations, just because of
747 // lazy constant value evaluation.
748 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
749 annotate.flush();
750 Type itype = attribExpr(variable.init, env, type);
751 if (itype.constValue() != null) {
752 return coerce(itype, type).constValue();
753 } else {
754 return null;
755 }
756 } finally {
757 deferredLintHandler.setPos(prevLintPos);
758 }
759 }
761 /** Attribute type reference in an `extends' or `implements' clause.
762 * Supertypes of anonymous inner classes are usually already attributed.
763 *
764 * @param tree The tree making up the type reference.
765 * @param env The environment current at the reference.
766 * @param classExpected true if only a class is expected here.
767 * @param interfaceExpected true if only an interface is expected here.
768 */
769 Type attribBase(JCTree tree,
770 Env<AttrContext> env,
771 boolean classExpected,
772 boolean interfaceExpected,
773 boolean checkExtensible) {
774 Type t = tree.type != null ?
775 tree.type :
776 attribType(tree, env);
777 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
778 }
779 Type checkBase(Type t,
780 JCTree tree,
781 Env<AttrContext> env,
782 boolean classExpected,
783 boolean interfaceExpected,
784 boolean checkExtensible) {
785 if (t.tsym.isAnonymous()) {
786 log.error(tree.pos(), "cant.inherit.from.anon");
787 return types.createErrorType(t);
788 }
789 if (t.isErroneous())
790 return t;
791 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
792 // check that type variable is already visible
793 if (t.getUpperBound() == null) {
794 log.error(tree.pos(), "illegal.forward.ref");
795 return types.createErrorType(t);
796 }
797 } else {
798 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
799 }
800 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
801 log.error(tree.pos(), "intf.expected.here");
802 // return errType is necessary since otherwise there might
803 // be undetected cycles which cause attribution to loop
804 return types.createErrorType(t);
805 } else if (checkExtensible &&
806 classExpected &&
807 (t.tsym.flags() & INTERFACE) != 0) {
808 log.error(tree.pos(), "no.intf.expected.here");
809 return types.createErrorType(t);
810 }
811 if (checkExtensible &&
812 ((t.tsym.flags() & FINAL) != 0)) {
813 log.error(tree.pos(),
814 "cant.inherit.from.final", t.tsym);
815 }
816 chk.checkNonCyclic(tree.pos(), t);
817 return t;
818 }
820 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
821 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
822 id.type = env.info.scope.owner.type;
823 id.sym = env.info.scope.owner;
824 return id.type;
825 }
827 public void visitClassDef(JCClassDecl tree) {
828 // Local and anonymous classes have not been entered yet, so we need to
829 // do it now.
830 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0) {
831 enter.classEnter(tree, env);
832 } else {
833 // If this class declaration is part of a class level annotation,
834 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
835 // order to simplify later steps and allow for sensible error
836 // messages.
837 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
838 enter.classEnter(tree, env);
839 }
841 ClassSymbol c = tree.sym;
842 if (c == null) {
843 // exit in case something drastic went wrong during enter.
844 result = null;
845 } else {
846 // make sure class has been completed:
847 c.complete();
849 // If this class appears as an anonymous class
850 // in a superclass constructor call where
851 // no explicit outer instance is given,
852 // disable implicit outer instance from being passed.
853 // (This would be an illegal access to "this before super").
854 if (env.info.isSelfCall &&
855 env.tree.hasTag(NEWCLASS) &&
856 ((JCNewClass) env.tree).encl == null)
857 {
858 c.flags_field |= NOOUTERTHIS;
859 }
860 attribClass(tree.pos(), c);
861 result = tree.type = c.type;
862 }
863 }
865 public void visitMethodDef(JCMethodDecl tree) {
866 MethodSymbol m = tree.sym;
867 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
869 Lint lint = env.info.lint.augment(m);
870 Lint prevLint = chk.setLint(lint);
871 MethodSymbol prevMethod = chk.setMethod(m);
872 try {
873 deferredLintHandler.flush(tree.pos());
874 chk.checkDeprecatedAnnotation(tree.pos(), m);
877 // Create a new environment with local scope
878 // for attributing the method.
879 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
880 localEnv.info.lint = lint;
882 attribStats(tree.typarams, localEnv);
884 // If we override any other methods, check that we do so properly.
885 // JLS ???
886 if (m.isStatic()) {
887 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
888 } else {
889 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
890 }
891 chk.checkOverride(tree, m);
893 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
894 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
895 }
897 // Enter all type parameters into the local method scope.
898 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
899 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
901 ClassSymbol owner = env.enclClass.sym;
902 if ((owner.flags() & ANNOTATION) != 0 &&
903 tree.params.nonEmpty())
904 log.error(tree.params.head.pos(),
905 "intf.annotation.members.cant.have.params");
907 // Attribute all value parameters.
908 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
909 attribStat(l.head, localEnv);
910 }
912 chk.checkVarargsMethodDecl(localEnv, tree);
914 // Check that type parameters are well-formed.
915 chk.validate(tree.typarams, localEnv);
917 // Check that result type is well-formed.
918 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
919 chk.validate(tree.restype, localEnv);
921 // Check that receiver type is well-formed.
922 if (tree.recvparam != null) {
923 // Use a new environment to check the receiver parameter.
924 // Otherwise I get "might not have been initialized" errors.
925 // Is there a better way?
926 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
927 attribType(tree.recvparam, newEnv);
928 chk.validate(tree.recvparam, newEnv);
929 }
931 // annotation method checks
932 if ((owner.flags() & ANNOTATION) != 0) {
933 // annotation method cannot have throws clause
934 if (tree.thrown.nonEmpty()) {
935 log.error(tree.thrown.head.pos(),
936 "throws.not.allowed.in.intf.annotation");
937 }
938 // annotation method cannot declare type-parameters
939 if (tree.typarams.nonEmpty()) {
940 log.error(tree.typarams.head.pos(),
941 "intf.annotation.members.cant.have.type.params");
942 }
943 // validate annotation method's return type (could be an annotation type)
944 chk.validateAnnotationType(tree.restype);
945 // ensure that annotation method does not clash with members of Object/Annotation
946 chk.validateAnnotationMethod(tree.pos(), m);
947 }
949 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
950 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
952 if (tree.body == null) {
953 // Empty bodies are only allowed for
954 // abstract, native, or interface methods, or for methods
955 // in a retrofit signature class.
956 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
957 !relax)
958 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
959 if (tree.defaultValue != null) {
960 if ((owner.flags() & ANNOTATION) == 0)
961 log.error(tree.pos(),
962 "default.allowed.in.intf.annotation.member");
963 }
964 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
965 if ((owner.flags() & INTERFACE) != 0) {
966 log.error(tree.body.pos(), "intf.meth.cant.have.body");
967 } else {
968 log.error(tree.pos(), "abstract.meth.cant.have.body");
969 }
970 } else if ((tree.mods.flags & NATIVE) != 0) {
971 log.error(tree.pos(), "native.meth.cant.have.body");
972 } else {
973 // Add an implicit super() call unless an explicit call to
974 // super(...) or this(...) is given
975 // or we are compiling class java.lang.Object.
976 if (tree.name == names.init && owner.type != syms.objectType) {
977 JCBlock body = tree.body;
978 if (body.stats.isEmpty() ||
979 !TreeInfo.isSelfCall(body.stats.head)) {
980 body.stats = body.stats.
981 prepend(memberEnter.SuperCall(make.at(body.pos),
982 List.<Type>nil(),
983 List.<JCVariableDecl>nil(),
984 false));
985 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
986 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
987 TreeInfo.isSuperCall(body.stats.head)) {
988 // enum constructors are not allowed to call super
989 // directly, so make sure there aren't any super calls
990 // in enum constructors, except in the compiler
991 // generated one.
992 log.error(tree.body.stats.head.pos(),
993 "call.to.super.not.allowed.in.enum.ctor",
994 env.enclClass.sym);
995 }
996 }
998 // Attribute all type annotations in the body
999 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1000 annotate.flush();
1002 // Attribute method body.
1003 attribStat(tree.body, localEnv);
1004 }
1006 localEnv.info.scope.leave();
1007 result = tree.type = m.type;
1008 }
1009 finally {
1010 chk.setLint(prevLint);
1011 chk.setMethod(prevMethod);
1012 }
1013 }
1015 public void visitVarDef(JCVariableDecl tree) {
1016 // Local variables have not been entered yet, so we need to do it now:
1017 if (env.info.scope.owner.kind == MTH) {
1018 if (tree.sym != null) {
1019 // parameters have already been entered
1020 env.info.scope.enter(tree.sym);
1021 } else {
1022 try {
1023 annotate.enterStart();
1024 memberEnter.memberEnter(tree, env);
1025 } finally {
1026 annotate.enterDone();
1027 }
1028 }
1029 } else {
1030 if (tree.init != null) {
1031 // Field initializer expression need to be entered.
1032 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1033 annotate.flush();
1034 }
1035 }
1037 VarSymbol v = tree.sym;
1038 Lint lint = env.info.lint.augment(v);
1039 Lint prevLint = chk.setLint(lint);
1041 // Check that the variable's declared type is well-formed.
1042 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1043 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1044 (tree.sym.flags() & PARAMETER) != 0;
1045 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1047 try {
1048 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1049 deferredLintHandler.flush(tree.pos());
1050 chk.checkDeprecatedAnnotation(tree.pos(), v);
1052 if (tree.init != null) {
1053 if ((v.flags_field & FINAL) == 0 ||
1054 !memberEnter.needsLazyConstValue(tree.init)) {
1055 // Not a compile-time constant
1056 // Attribute initializer in a new environment
1057 // with the declared variable as owner.
1058 // Check that initializer conforms to variable's declared type.
1059 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1060 initEnv.info.lint = lint;
1061 // In order to catch self-references, we set the variable's
1062 // declaration position to maximal possible value, effectively
1063 // marking the variable as undefined.
1064 initEnv.info.enclVar = v;
1065 attribExpr(tree.init, initEnv, v.type);
1066 }
1067 }
1068 result = tree.type = v.type;
1069 }
1070 finally {
1071 chk.setLint(prevLint);
1072 }
1073 }
1075 public void visitSkip(JCSkip tree) {
1076 result = null;
1077 }
1079 public void visitBlock(JCBlock tree) {
1080 if (env.info.scope.owner.kind == TYP) {
1081 // Block is a static or instance initializer;
1082 // let the owner of the environment be a freshly
1083 // created BLOCK-method.
1084 Env<AttrContext> localEnv =
1085 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1086 localEnv.info.scope.owner =
1087 new MethodSymbol(tree.flags | BLOCK |
1088 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1089 env.info.scope.owner);
1090 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1092 // Attribute all type annotations in the block
1093 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1094 annotate.flush();
1096 {
1097 // Store init and clinit type annotations with the ClassSymbol
1098 // to allow output in Gen.normalizeDefs.
1099 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1100 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1101 if ((tree.flags & STATIC) != 0) {
1102 cs.appendClassInitTypeAttributes(tas);
1103 } else {
1104 cs.appendInitTypeAttributes(tas);
1105 }
1106 }
1108 attribStats(tree.stats, localEnv);
1109 } else {
1110 // Create a new local environment with a local scope.
1111 Env<AttrContext> localEnv =
1112 env.dup(tree, env.info.dup(env.info.scope.dup()));
1113 try {
1114 attribStats(tree.stats, localEnv);
1115 } finally {
1116 localEnv.info.scope.leave();
1117 }
1118 }
1119 result = null;
1120 }
1122 public void visitDoLoop(JCDoWhileLoop tree) {
1123 attribStat(tree.body, env.dup(tree));
1124 attribExpr(tree.cond, env, syms.booleanType);
1125 result = null;
1126 }
1128 public void visitWhileLoop(JCWhileLoop tree) {
1129 attribExpr(tree.cond, env, syms.booleanType);
1130 attribStat(tree.body, env.dup(tree));
1131 result = null;
1132 }
1134 public void visitForLoop(JCForLoop tree) {
1135 Env<AttrContext> loopEnv =
1136 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1137 try {
1138 attribStats(tree.init, loopEnv);
1139 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1140 loopEnv.tree = tree; // before, we were not in loop!
1141 attribStats(tree.step, loopEnv);
1142 attribStat(tree.body, loopEnv);
1143 result = null;
1144 }
1145 finally {
1146 loopEnv.info.scope.leave();
1147 }
1148 }
1150 public void visitForeachLoop(JCEnhancedForLoop tree) {
1151 Env<AttrContext> loopEnv =
1152 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1153 try {
1154 //the Formal Parameter of a for-each loop is not in the scope when
1155 //attributing the for-each expression; we mimick this by attributing
1156 //the for-each expression first (against original scope).
1157 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1158 attribStat(tree.var, loopEnv);
1159 chk.checkNonVoid(tree.pos(), exprType);
1160 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1161 if (elemtype == null) {
1162 // or perhaps expr implements Iterable<T>?
1163 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1164 if (base == null) {
1165 log.error(tree.expr.pos(),
1166 "foreach.not.applicable.to.type",
1167 exprType,
1168 diags.fragment("type.req.array.or.iterable"));
1169 elemtype = types.createErrorType(exprType);
1170 } else {
1171 List<Type> iterableParams = base.allparams();
1172 elemtype = iterableParams.isEmpty()
1173 ? syms.objectType
1174 : types.wildUpperBound(iterableParams.head);
1175 }
1176 }
1177 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1178 loopEnv.tree = tree; // before, we were not in loop!
1179 attribStat(tree.body, loopEnv);
1180 result = null;
1181 }
1182 finally {
1183 loopEnv.info.scope.leave();
1184 }
1185 }
1187 public void visitLabelled(JCLabeledStatement tree) {
1188 // Check that label is not used in an enclosing statement
1189 Env<AttrContext> env1 = env;
1190 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1191 if (env1.tree.hasTag(LABELLED) &&
1192 ((JCLabeledStatement) env1.tree).label == tree.label) {
1193 log.error(tree.pos(), "label.already.in.use",
1194 tree.label);
1195 break;
1196 }
1197 env1 = env1.next;
1198 }
1200 attribStat(tree.body, env.dup(tree));
1201 result = null;
1202 }
1204 public void visitSwitch(JCSwitch tree) {
1205 Type seltype = attribExpr(tree.selector, env);
1207 Env<AttrContext> switchEnv =
1208 env.dup(tree, env.info.dup(env.info.scope.dup()));
1210 try {
1212 boolean enumSwitch =
1213 allowEnums &&
1214 (seltype.tsym.flags() & Flags.ENUM) != 0;
1215 boolean stringSwitch = false;
1216 if (types.isSameType(seltype, syms.stringType)) {
1217 if (allowStringsInSwitch) {
1218 stringSwitch = true;
1219 } else {
1220 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1221 }
1222 }
1223 if (!enumSwitch && !stringSwitch)
1224 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1226 // Attribute all cases and
1227 // check that there are no duplicate case labels or default clauses.
1228 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1229 boolean hasDefault = false; // Is there a default label?
1230 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1231 JCCase c = l.head;
1232 Env<AttrContext> caseEnv =
1233 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1234 try {
1235 if (c.pat != null) {
1236 if (enumSwitch) {
1237 Symbol sym = enumConstant(c.pat, seltype);
1238 if (sym == null) {
1239 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1240 } else if (!labels.add(sym)) {
1241 log.error(c.pos(), "duplicate.case.label");
1242 }
1243 } else {
1244 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1245 if (!pattype.hasTag(ERROR)) {
1246 if (pattype.constValue() == null) {
1247 log.error(c.pat.pos(),
1248 (stringSwitch ? "string.const.req" : "const.expr.req"));
1249 } else if (labels.contains(pattype.constValue())) {
1250 log.error(c.pos(), "duplicate.case.label");
1251 } else {
1252 labels.add(pattype.constValue());
1253 }
1254 }
1255 }
1256 } else if (hasDefault) {
1257 log.error(c.pos(), "duplicate.default.label");
1258 } else {
1259 hasDefault = true;
1260 }
1261 attribStats(c.stats, caseEnv);
1262 } finally {
1263 caseEnv.info.scope.leave();
1264 addVars(c.stats, switchEnv.info.scope);
1265 }
1266 }
1268 result = null;
1269 }
1270 finally {
1271 switchEnv.info.scope.leave();
1272 }
1273 }
1274 // where
1275 /** Add any variables defined in stats to the switch scope. */
1276 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1277 for (;stats.nonEmpty(); stats = stats.tail) {
1278 JCTree stat = stats.head;
1279 if (stat.hasTag(VARDEF))
1280 switchScope.enter(((JCVariableDecl) stat).sym);
1281 }
1282 }
1283 // where
1284 /** Return the selected enumeration constant symbol, or null. */
1285 private Symbol enumConstant(JCTree tree, Type enumType) {
1286 if (!tree.hasTag(IDENT)) {
1287 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1288 return syms.errSymbol;
1289 }
1290 JCIdent ident = (JCIdent)tree;
1291 Name name = ident.name;
1292 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1293 e.scope != null; e = e.next()) {
1294 if (e.sym.kind == VAR) {
1295 Symbol s = ident.sym = e.sym;
1296 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1297 ident.type = s.type;
1298 return ((s.flags_field & Flags.ENUM) == 0)
1299 ? null : s;
1300 }
1301 }
1302 return null;
1303 }
1305 public void visitSynchronized(JCSynchronized tree) {
1306 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1307 attribStat(tree.body, env);
1308 result = null;
1309 }
1311 public void visitTry(JCTry tree) {
1312 // Create a new local environment with a local
1313 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1314 try {
1315 boolean isTryWithResource = tree.resources.nonEmpty();
1316 // Create a nested environment for attributing the try block if needed
1317 Env<AttrContext> tryEnv = isTryWithResource ?
1318 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1319 localEnv;
1320 try {
1321 // Attribute resource declarations
1322 for (JCTree resource : tree.resources) {
1323 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1324 @Override
1325 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1326 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1327 }
1328 };
1329 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1330 if (resource.hasTag(VARDEF)) {
1331 attribStat(resource, tryEnv);
1332 twrResult.check(resource, resource.type);
1334 //check that resource type cannot throw InterruptedException
1335 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1337 VarSymbol var = ((JCVariableDecl) resource).sym;
1338 var.setData(ElementKind.RESOURCE_VARIABLE);
1339 } else {
1340 attribTree(resource, tryEnv, twrResult);
1341 }
1342 }
1343 // Attribute body
1344 attribStat(tree.body, tryEnv);
1345 } finally {
1346 if (isTryWithResource)
1347 tryEnv.info.scope.leave();
1348 }
1350 // Attribute catch clauses
1351 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1352 JCCatch c = l.head;
1353 Env<AttrContext> catchEnv =
1354 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1355 try {
1356 Type ctype = attribStat(c.param, catchEnv);
1357 if (TreeInfo.isMultiCatch(c)) {
1358 //multi-catch parameter is implicitly marked as final
1359 c.param.sym.flags_field |= FINAL | UNION;
1360 }
1361 if (c.param.sym.kind == Kinds.VAR) {
1362 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1363 }
1364 chk.checkType(c.param.vartype.pos(),
1365 chk.checkClassType(c.param.vartype.pos(), ctype),
1366 syms.throwableType);
1367 attribStat(c.body, catchEnv);
1368 } finally {
1369 catchEnv.info.scope.leave();
1370 }
1371 }
1373 // Attribute finalizer
1374 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1375 result = null;
1376 }
1377 finally {
1378 localEnv.info.scope.leave();
1379 }
1380 }
1382 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1383 if (!resource.isErroneous() &&
1384 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1385 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1386 Symbol close = syms.noSymbol;
1387 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1388 try {
1389 close = rs.resolveQualifiedMethod(pos,
1390 env,
1391 resource,
1392 names.close,
1393 List.<Type>nil(),
1394 List.<Type>nil());
1395 }
1396 finally {
1397 log.popDiagnosticHandler(discardHandler);
1398 }
1399 if (close.kind == MTH &&
1400 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1401 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1402 env.info.lint.isEnabled(LintCategory.TRY)) {
1403 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1404 }
1405 }
1406 }
1408 public void visitConditional(JCConditional tree) {
1409 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1411 tree.polyKind = (!allowPoly ||
1412 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1413 isBooleanOrNumeric(env, tree)) ?
1414 PolyKind.STANDALONE : PolyKind.POLY;
1416 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1417 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1418 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1419 result = tree.type = types.createErrorType(resultInfo.pt);
1420 return;
1421 }
1423 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1424 unknownExprInfo :
1425 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1426 //this will use enclosing check context to check compatibility of
1427 //subexpression against target type; if we are in a method check context,
1428 //depending on whether boxing is allowed, we could have incompatibilities
1429 @Override
1430 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1431 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1432 }
1433 });
1435 Type truetype = attribTree(tree.truepart, env, condInfo);
1436 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1438 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1439 if (condtype.constValue() != null &&
1440 truetype.constValue() != null &&
1441 falsetype.constValue() != null &&
1442 !owntype.hasTag(NONE)) {
1443 //constant folding
1444 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1445 }
1446 result = check(tree, owntype, VAL, resultInfo);
1447 }
1448 //where
1449 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1450 switch (tree.getTag()) {
1451 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1452 ((JCLiteral)tree).typetag == BOOLEAN ||
1453 ((JCLiteral)tree).typetag == BOT;
1454 case LAMBDA: case REFERENCE: return false;
1455 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1456 case CONDEXPR:
1457 JCConditional condTree = (JCConditional)tree;
1458 return isBooleanOrNumeric(env, condTree.truepart) &&
1459 isBooleanOrNumeric(env, condTree.falsepart);
1460 case APPLY:
1461 JCMethodInvocation speculativeMethodTree =
1462 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1463 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1464 return types.unboxedTypeOrType(owntype).isPrimitive();
1465 case NEWCLASS:
1466 JCExpression className =
1467 removeClassParams.translate(((JCNewClass)tree).clazz);
1468 JCExpression speculativeNewClassTree =
1469 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1470 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1471 default:
1472 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1473 speculativeType = types.unboxedTypeOrType(speculativeType);
1474 return speculativeType.isPrimitive();
1475 }
1476 }
1477 //where
1478 TreeTranslator removeClassParams = new TreeTranslator() {
1479 @Override
1480 public void visitTypeApply(JCTypeApply tree) {
1481 result = translate(tree.clazz);
1482 }
1483 };
1485 /** Compute the type of a conditional expression, after
1486 * checking that it exists. See JLS 15.25. Does not take into
1487 * account the special case where condition and both arms
1488 * are constants.
1489 *
1490 * @param pos The source position to be used for error
1491 * diagnostics.
1492 * @param thentype The type of the expression's then-part.
1493 * @param elsetype The type of the expression's else-part.
1494 */
1495 private Type condType(DiagnosticPosition pos,
1496 Type thentype, Type elsetype) {
1497 // If same type, that is the result
1498 if (types.isSameType(thentype, elsetype))
1499 return thentype.baseType();
1501 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1502 ? thentype : types.unboxedType(thentype);
1503 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1504 ? elsetype : types.unboxedType(elsetype);
1506 // Otherwise, if both arms can be converted to a numeric
1507 // type, return the least numeric type that fits both arms
1508 // (i.e. return larger of the two, or return int if one
1509 // arm is short, the other is char).
1510 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1511 // If one arm has an integer subrange type (i.e., byte,
1512 // short, or char), and the other is an integer constant
1513 // that fits into the subrange, return the subrange type.
1514 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1515 elseUnboxed.hasTag(INT) &&
1516 types.isAssignable(elseUnboxed, thenUnboxed)) {
1517 return thenUnboxed.baseType();
1518 }
1519 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1520 thenUnboxed.hasTag(INT) &&
1521 types.isAssignable(thenUnboxed, elseUnboxed)) {
1522 return elseUnboxed.baseType();
1523 }
1525 for (TypeTag tag : primitiveTags) {
1526 Type candidate = syms.typeOfTag[tag.ordinal()];
1527 if (types.isSubtype(thenUnboxed, candidate) &&
1528 types.isSubtype(elseUnboxed, candidate)) {
1529 return candidate;
1530 }
1531 }
1532 }
1534 // Those were all the cases that could result in a primitive
1535 if (allowBoxing) {
1536 if (thentype.isPrimitive())
1537 thentype = types.boxedClass(thentype).type;
1538 if (elsetype.isPrimitive())
1539 elsetype = types.boxedClass(elsetype).type;
1540 }
1542 if (types.isSubtype(thentype, elsetype))
1543 return elsetype.baseType();
1544 if (types.isSubtype(elsetype, thentype))
1545 return thentype.baseType();
1547 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1548 log.error(pos, "neither.conditional.subtype",
1549 thentype, elsetype);
1550 return thentype.baseType();
1551 }
1553 // both are known to be reference types. The result is
1554 // lub(thentype,elsetype). This cannot fail, as it will
1555 // always be possible to infer "Object" if nothing better.
1556 return types.lub(thentype.baseType(), elsetype.baseType());
1557 }
1559 final static TypeTag[] primitiveTags = new TypeTag[]{
1560 BYTE,
1561 CHAR,
1562 SHORT,
1563 INT,
1564 LONG,
1565 FLOAT,
1566 DOUBLE,
1567 BOOLEAN,
1568 };
1570 public void visitIf(JCIf tree) {
1571 attribExpr(tree.cond, env, syms.booleanType);
1572 attribStat(tree.thenpart, env);
1573 if (tree.elsepart != null)
1574 attribStat(tree.elsepart, env);
1575 chk.checkEmptyIf(tree);
1576 result = null;
1577 }
1579 public void visitExec(JCExpressionStatement tree) {
1580 //a fresh environment is required for 292 inference to work properly ---
1581 //see Infer.instantiatePolymorphicSignatureInstance()
1582 Env<AttrContext> localEnv = env.dup(tree);
1583 attribExpr(tree.expr, localEnv);
1584 result = null;
1585 }
1587 public void visitBreak(JCBreak tree) {
1588 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1589 result = null;
1590 }
1592 public void visitContinue(JCContinue tree) {
1593 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1594 result = null;
1595 }
1596 //where
1597 /** Return the target of a break or continue statement, if it exists,
1598 * report an error if not.
1599 * Note: The target of a labelled break or continue is the
1600 * (non-labelled) statement tree referred to by the label,
1601 * not the tree representing the labelled statement itself.
1602 *
1603 * @param pos The position to be used for error diagnostics
1604 * @param tag The tag of the jump statement. This is either
1605 * Tree.BREAK or Tree.CONTINUE.
1606 * @param label The label of the jump statement, or null if no
1607 * label is given.
1608 * @param env The environment current at the jump statement.
1609 */
1610 private JCTree findJumpTarget(DiagnosticPosition pos,
1611 JCTree.Tag tag,
1612 Name label,
1613 Env<AttrContext> env) {
1614 // Search environments outwards from the point of jump.
1615 Env<AttrContext> env1 = env;
1616 LOOP:
1617 while (env1 != null) {
1618 switch (env1.tree.getTag()) {
1619 case LABELLED:
1620 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1621 if (label == labelled.label) {
1622 // If jump is a continue, check that target is a loop.
1623 if (tag == CONTINUE) {
1624 if (!labelled.body.hasTag(DOLOOP) &&
1625 !labelled.body.hasTag(WHILELOOP) &&
1626 !labelled.body.hasTag(FORLOOP) &&
1627 !labelled.body.hasTag(FOREACHLOOP))
1628 log.error(pos, "not.loop.label", label);
1629 // Found labelled statement target, now go inwards
1630 // to next non-labelled tree.
1631 return TreeInfo.referencedStatement(labelled);
1632 } else {
1633 return labelled;
1634 }
1635 }
1636 break;
1637 case DOLOOP:
1638 case WHILELOOP:
1639 case FORLOOP:
1640 case FOREACHLOOP:
1641 if (label == null) return env1.tree;
1642 break;
1643 case SWITCH:
1644 if (label == null && tag == BREAK) return env1.tree;
1645 break;
1646 case LAMBDA:
1647 case METHODDEF:
1648 case CLASSDEF:
1649 break LOOP;
1650 default:
1651 }
1652 env1 = env1.next;
1653 }
1654 if (label != null)
1655 log.error(pos, "undef.label", label);
1656 else if (tag == CONTINUE)
1657 log.error(pos, "cont.outside.loop");
1658 else
1659 log.error(pos, "break.outside.switch.loop");
1660 return null;
1661 }
1663 public void visitReturn(JCReturn tree) {
1664 // Check that there is an enclosing method which is
1665 // nested within than the enclosing class.
1666 if (env.info.returnResult == null) {
1667 log.error(tree.pos(), "ret.outside.meth");
1668 } else {
1669 // Attribute return expression, if it exists, and check that
1670 // it conforms to result type of enclosing method.
1671 if (tree.expr != null) {
1672 if (env.info.returnResult.pt.hasTag(VOID)) {
1673 env.info.returnResult.checkContext.report(tree.expr.pos(),
1674 diags.fragment("unexpected.ret.val"));
1675 }
1676 attribTree(tree.expr, env, env.info.returnResult);
1677 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1678 !env.info.returnResult.pt.hasTag(NONE)) {
1679 env.info.returnResult.checkContext.report(tree.pos(),
1680 diags.fragment("missing.ret.val"));
1681 }
1682 }
1683 result = null;
1684 }
1686 public void visitThrow(JCThrow tree) {
1687 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1688 if (allowPoly) {
1689 chk.checkType(tree, owntype, syms.throwableType);
1690 }
1691 result = null;
1692 }
1694 public void visitAssert(JCAssert tree) {
1695 attribExpr(tree.cond, env, syms.booleanType);
1696 if (tree.detail != null) {
1697 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1698 }
1699 result = null;
1700 }
1702 /** Visitor method for method invocations.
1703 * NOTE: The method part of an application will have in its type field
1704 * the return type of the method, not the method's type itself!
1705 */
1706 public void visitApply(JCMethodInvocation tree) {
1707 // The local environment of a method application is
1708 // a new environment nested in the current one.
1709 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1711 // The types of the actual method arguments.
1712 List<Type> argtypes;
1714 // The types of the actual method type arguments.
1715 List<Type> typeargtypes = null;
1717 Name methName = TreeInfo.name(tree.meth);
1719 boolean isConstructorCall =
1720 methName == names._this || methName == names._super;
1722 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1723 if (isConstructorCall) {
1724 // We are seeing a ...this(...) or ...super(...) call.
1725 // Check that this is the first statement in a constructor.
1726 if (checkFirstConstructorStat(tree, env)) {
1728 // Record the fact
1729 // that this is a constructor call (using isSelfCall).
1730 localEnv.info.isSelfCall = true;
1732 // Attribute arguments, yielding list of argument types.
1733 attribArgs(tree.args, localEnv, argtypesBuf);
1734 argtypes = argtypesBuf.toList();
1735 typeargtypes = attribTypes(tree.typeargs, localEnv);
1737 // Variable `site' points to the class in which the called
1738 // constructor is defined.
1739 Type site = env.enclClass.sym.type;
1740 if (methName == names._super) {
1741 if (site == syms.objectType) {
1742 log.error(tree.meth.pos(), "no.superclass", site);
1743 site = types.createErrorType(syms.objectType);
1744 } else {
1745 site = types.supertype(site);
1746 }
1747 }
1749 if (site.hasTag(CLASS)) {
1750 Type encl = site.getEnclosingType();
1751 while (encl != null && encl.hasTag(TYPEVAR))
1752 encl = encl.getUpperBound();
1753 if (encl.hasTag(CLASS)) {
1754 // we are calling a nested class
1756 if (tree.meth.hasTag(SELECT)) {
1757 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1759 // We are seeing a prefixed call, of the form
1760 // <expr>.super(...).
1761 // Check that the prefix expression conforms
1762 // to the outer instance type of the class.
1763 chk.checkRefType(qualifier.pos(),
1764 attribExpr(qualifier, localEnv,
1765 encl));
1766 } else if (methName == names._super) {
1767 // qualifier omitted; check for existence
1768 // of an appropriate implicit qualifier.
1769 rs.resolveImplicitThis(tree.meth.pos(),
1770 localEnv, site, true);
1771 }
1772 } else if (tree.meth.hasTag(SELECT)) {
1773 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1774 site.tsym);
1775 }
1777 // if we're calling a java.lang.Enum constructor,
1778 // prefix the implicit String and int parameters
1779 if (site.tsym == syms.enumSym && allowEnums)
1780 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1782 // Resolve the called constructor under the assumption
1783 // that we are referring to a superclass instance of the
1784 // current instance (JLS ???).
1785 boolean selectSuperPrev = localEnv.info.selectSuper;
1786 localEnv.info.selectSuper = true;
1787 localEnv.info.pendingResolutionPhase = null;
1788 Symbol sym = rs.resolveConstructor(
1789 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1790 localEnv.info.selectSuper = selectSuperPrev;
1792 // Set method symbol to resolved constructor...
1793 TreeInfo.setSymbol(tree.meth, sym);
1795 // ...and check that it is legal in the current context.
1796 // (this will also set the tree's type)
1797 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1798 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1799 }
1800 // Otherwise, `site' is an error type and we do nothing
1801 }
1802 result = tree.type = syms.voidType;
1803 } else {
1804 // Otherwise, we are seeing a regular method call.
1805 // Attribute the arguments, yielding list of argument types, ...
1806 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1807 argtypes = argtypesBuf.toList();
1808 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1810 // ... and attribute the method using as a prototype a methodtype
1811 // whose formal argument types is exactly the list of actual
1812 // arguments (this will also set the method symbol).
1813 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1814 localEnv.info.pendingResolutionPhase = null;
1815 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1817 // Compute the result type.
1818 Type restype = mtype.getReturnType();
1819 if (restype.hasTag(WILDCARD))
1820 throw new AssertionError(mtype);
1822 Type qualifier = (tree.meth.hasTag(SELECT))
1823 ? ((JCFieldAccess) tree.meth).selected.type
1824 : env.enclClass.sym.type;
1825 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1827 chk.checkRefTypes(tree.typeargs, typeargtypes);
1829 // Check that value of resulting type is admissible in the
1830 // current context. Also, capture the return type
1831 result = check(tree, capture(restype), VAL, resultInfo);
1832 }
1833 chk.validate(tree.typeargs, localEnv);
1834 }
1835 //where
1836 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1837 if (allowCovariantReturns &&
1838 methodName == names.clone &&
1839 types.isArray(qualifierType)) {
1840 // as a special case, array.clone() has a result that is
1841 // the same as static type of the array being cloned
1842 return qualifierType;
1843 } else if (allowGenerics &&
1844 methodName == names.getClass &&
1845 argtypes.isEmpty()) {
1846 // as a special case, x.getClass() has type Class<? extends |X|>
1847 return new ClassType(restype.getEnclosingType(),
1848 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1849 BoundKind.EXTENDS,
1850 syms.boundClass)),
1851 restype.tsym);
1852 } else {
1853 return restype;
1854 }
1855 }
1857 /** Check that given application node appears as first statement
1858 * in a constructor call.
1859 * @param tree The application node
1860 * @param env The environment current at the application.
1861 */
1862 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1863 JCMethodDecl enclMethod = env.enclMethod;
1864 if (enclMethod != null && enclMethod.name == names.init) {
1865 JCBlock body = enclMethod.body;
1866 if (body.stats.head.hasTag(EXEC) &&
1867 ((JCExpressionStatement) body.stats.head).expr == tree)
1868 return true;
1869 }
1870 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1871 TreeInfo.name(tree.meth));
1872 return false;
1873 }
1875 /** Obtain a method type with given argument types.
1876 */
1877 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1878 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1879 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1880 }
1882 public void visitNewClass(final JCNewClass tree) {
1883 Type owntype = types.createErrorType(tree.type);
1885 // The local environment of a class creation is
1886 // a new environment nested in the current one.
1887 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1889 // The anonymous inner class definition of the new expression,
1890 // if one is defined by it.
1891 JCClassDecl cdef = tree.def;
1893 // If enclosing class is given, attribute it, and
1894 // complete class name to be fully qualified
1895 JCExpression clazz = tree.clazz; // Class field following new
1896 JCExpression clazzid; // Identifier in class field
1897 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1898 annoclazzid = null;
1900 if (clazz.hasTag(TYPEAPPLY)) {
1901 clazzid = ((JCTypeApply) clazz).clazz;
1902 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1903 annoclazzid = (JCAnnotatedType) clazzid;
1904 clazzid = annoclazzid.underlyingType;
1905 }
1906 } else {
1907 if (clazz.hasTag(ANNOTATED_TYPE)) {
1908 annoclazzid = (JCAnnotatedType) clazz;
1909 clazzid = annoclazzid.underlyingType;
1910 } else {
1911 clazzid = clazz;
1912 }
1913 }
1915 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1917 if (tree.encl != null) {
1918 // We are seeing a qualified new, of the form
1919 // <expr>.new C <...> (...) ...
1920 // In this case, we let clazz stand for the name of the
1921 // allocated class C prefixed with the type of the qualifier
1922 // expression, so that we can
1923 // resolve it with standard techniques later. I.e., if
1924 // <expr> has type T, then <expr>.new C <...> (...)
1925 // yields a clazz T.C.
1926 Type encltype = chk.checkRefType(tree.encl.pos(),
1927 attribExpr(tree.encl, env));
1928 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1929 // from expr to the combined type, or not? Yes, do this.
1930 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1931 ((JCIdent) clazzid).name);
1933 EndPosTable endPosTable = this.env.toplevel.endPositions;
1934 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1935 if (clazz.hasTag(ANNOTATED_TYPE)) {
1936 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1937 List<JCAnnotation> annos = annoType.annotations;
1939 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1940 clazzid1 = make.at(tree.pos).
1941 TypeApply(clazzid1,
1942 ((JCTypeApply) clazz).arguments);
1943 }
1945 clazzid1 = make.at(tree.pos).
1946 AnnotatedType(annos, clazzid1);
1947 } else if (clazz.hasTag(TYPEAPPLY)) {
1948 clazzid1 = make.at(tree.pos).
1949 TypeApply(clazzid1,
1950 ((JCTypeApply) clazz).arguments);
1951 }
1953 clazz = clazzid1;
1954 }
1956 // Attribute clazz expression and store
1957 // symbol + type back into the attributed tree.
1958 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1959 attribIdentAsEnumType(env, (JCIdent)clazz) :
1960 attribType(clazz, env);
1962 clazztype = chk.checkDiamond(tree, clazztype);
1963 chk.validate(clazz, localEnv);
1964 if (tree.encl != null) {
1965 // We have to work in this case to store
1966 // symbol + type back into the attributed tree.
1967 tree.clazz.type = clazztype;
1968 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1969 clazzid.type = ((JCIdent) clazzid).sym.type;
1970 if (annoclazzid != null) {
1971 annoclazzid.type = clazzid.type;
1972 }
1973 if (!clazztype.isErroneous()) {
1974 if (cdef != null && clazztype.tsym.isInterface()) {
1975 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1976 } else if (clazztype.tsym.isStatic()) {
1977 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1978 }
1979 }
1980 } else if (!clazztype.tsym.isInterface() &&
1981 clazztype.getEnclosingType().hasTag(CLASS)) {
1982 // Check for the existence of an apropos outer instance
1983 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1984 }
1986 // Attribute constructor arguments.
1987 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1988 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
1989 List<Type> argtypes = argtypesBuf.toList();
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(pkind, 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(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2077 if (rsEnv.info.lastResolveVarargs())
2078 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2079 }
2080 if (cdef == null &&
2081 !clazztype.isErroneous() &&
2082 clazztype.getTypeArguments().nonEmpty() &&
2083 findDiamonds) {
2084 findDiamond(localEnv, tree, clazztype);
2085 }
2086 }
2088 if (cdef != null) {
2089 // We are seeing an anonymous class instance creation.
2090 // In this case, the class instance creation
2091 // expression
2092 //
2093 // E.new <typeargs1>C<typargs2>(args) { ... }
2094 //
2095 // is represented internally as
2096 //
2097 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2098 //
2099 // This expression is then *transformed* as follows:
2100 //
2101 // (1) add a STATIC flag to the class definition
2102 // if the current environment is static
2103 // (2) add an extends or implements clause
2104 // (3) add a constructor.
2105 //
2106 // For instance, if C is a class, and ET is the type of E,
2107 // the expression
2108 //
2109 // E.new <typeargs1>C<typargs2>(args) { ... }
2110 //
2111 // is translated to (where X is a fresh name and typarams is the
2112 // parameter list of the super constructor):
2113 //
2114 // new <typeargs1>X(<*nullchk*>E, args) where
2115 // X extends C<typargs2> {
2116 // <typarams> X(ET e, args) {
2117 // e.<typeargs1>super(args)
2118 // }
2119 // ...
2120 // }
2121 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2123 if (clazztype.tsym.isInterface()) {
2124 cdef.implementing = List.of(clazz);
2125 } else {
2126 cdef.extending = clazz;
2127 }
2129 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2130 isSerializable(clazztype)) {
2131 localEnv.info.isSerializable = true;
2132 }
2134 attribStat(cdef, localEnv);
2136 checkLambdaCandidate(tree, cdef.sym, clazztype);
2138 // If an outer instance is given,
2139 // prefix it to the constructor arguments
2140 // and delete it from the new expression
2141 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2142 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2143 argtypes = argtypes.prepend(tree.encl.type);
2144 tree.encl = null;
2145 }
2147 // Reassign clazztype and recompute constructor.
2148 clazztype = cdef.sym.type;
2149 Symbol sym = tree.constructor = rs.resolveConstructor(
2150 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2151 Assert.check(sym.kind < AMBIGUOUS);
2152 tree.constructor = sym;
2153 tree.constructorType = checkId(tree,
2154 clazztype,
2155 tree.constructor,
2156 localEnv,
2157 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2158 }
2160 if (tree.constructor != null && tree.constructor.kind == MTH)
2161 owntype = clazztype;
2162 }
2163 result = check(tree, owntype, VAL, resultInfo);
2164 chk.validate(tree.typeargs, localEnv);
2165 }
2166 //where
2167 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2168 JCTypeApply ta = (JCTypeApply)tree.clazz;
2169 List<JCExpression> prevTypeargs = ta.arguments;
2170 try {
2171 //create a 'fake' diamond AST node by removing type-argument trees
2172 ta.arguments = List.nil();
2173 ResultInfo findDiamondResult = new ResultInfo(VAL,
2174 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2175 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2176 Type polyPt = allowPoly ?
2177 syms.objectType :
2178 clazztype;
2179 if (!inferred.isErroneous() &&
2180 (allowPoly && pt() == Infer.anyPoly ?
2181 types.isSameType(inferred, clazztype) :
2182 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2183 String key = types.isSameType(clazztype, inferred) ?
2184 "diamond.redundant.args" :
2185 "diamond.redundant.args.1";
2186 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2187 }
2188 } finally {
2189 ta.arguments = prevTypeargs;
2190 }
2191 }
2193 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2194 if (allowLambda &&
2195 identifyLambdaCandidate &&
2196 clazztype.hasTag(CLASS) &&
2197 !pt().hasTag(NONE) &&
2198 types.isFunctionalInterface(clazztype.tsym)) {
2199 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2200 int count = 0;
2201 boolean found = false;
2202 for (Symbol sym : csym.members().getElements()) {
2203 if ((sym.flags() & SYNTHETIC) != 0 ||
2204 sym.isConstructor()) continue;
2205 count++;
2206 if (sym.kind != MTH ||
2207 !sym.name.equals(descriptor.name)) continue;
2208 Type mtype = types.memberType(clazztype, sym);
2209 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2210 found = true;
2211 }
2212 }
2213 if (found && count == 1) {
2214 log.note(tree.def, "potential.lambda.found");
2215 }
2216 }
2217 }
2219 /** Make an attributed null check tree.
2220 */
2221 public JCExpression makeNullCheck(JCExpression arg) {
2222 // optimization: X.this is never null; skip null check
2223 Name name = TreeInfo.name(arg);
2224 if (name == names._this || name == names._super) return arg;
2226 JCTree.Tag optag = NULLCHK;
2227 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2228 tree.operator = syms.nullcheck;
2229 tree.type = arg.type;
2230 return tree;
2231 }
2233 public void visitNewArray(JCNewArray tree) {
2234 Type owntype = types.createErrorType(tree.type);
2235 Env<AttrContext> localEnv = env.dup(tree);
2236 Type elemtype;
2237 if (tree.elemtype != null) {
2238 elemtype = attribType(tree.elemtype, localEnv);
2239 chk.validate(tree.elemtype, localEnv);
2240 owntype = elemtype;
2241 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2242 attribExpr(l.head, localEnv, syms.intType);
2243 owntype = new ArrayType(owntype, syms.arrayClass);
2244 }
2245 } else {
2246 // we are seeing an untyped aggregate { ... }
2247 // this is allowed only if the prototype is an array
2248 if (pt().hasTag(ARRAY)) {
2249 elemtype = types.elemtype(pt());
2250 } else {
2251 if (!pt().hasTag(ERROR)) {
2252 log.error(tree.pos(), "illegal.initializer.for.type",
2253 pt());
2254 }
2255 elemtype = types.createErrorType(pt());
2256 }
2257 }
2258 if (tree.elems != null) {
2259 attribExprs(tree.elems, localEnv, elemtype);
2260 owntype = new ArrayType(elemtype, syms.arrayClass);
2261 }
2262 if (!types.isReifiable(elemtype))
2263 log.error(tree.pos(), "generic.array.creation");
2264 result = check(tree, owntype, VAL, resultInfo);
2265 }
2267 /*
2268 * A lambda expression can only be attributed when a target-type is available.
2269 * In addition, if the target-type is that of a functional interface whose
2270 * descriptor contains inference variables in argument position the lambda expression
2271 * is 'stuck' (see DeferredAttr).
2272 */
2273 @Override
2274 public void visitLambda(final JCLambda that) {
2275 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2276 if (pt().hasTag(NONE)) {
2277 //lambda only allowed in assignment or method invocation/cast context
2278 log.error(that.pos(), "unexpected.lambda");
2279 }
2280 result = that.type = types.createErrorType(pt());
2281 return;
2282 }
2283 //create an environment for attribution of the lambda expression
2284 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2285 boolean needsRecovery =
2286 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2287 try {
2288 Type currentTarget = pt();
2289 if (needsRecovery && isSerializable(currentTarget)) {
2290 localEnv.info.isSerializable = true;
2291 }
2292 List<Type> explicitParamTypes = null;
2293 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2294 //attribute lambda parameters
2295 attribStats(that.params, localEnv);
2296 explicitParamTypes = TreeInfo.types(that.params);
2297 }
2299 Type lambdaType;
2300 if (pt() != Type.recoveryType) {
2301 /* We need to adjust the target. If the target is an
2302 * intersection type, for example: SAM & I1 & I2 ...
2303 * the target will be updated to SAM
2304 */
2305 currentTarget = targetChecker.visit(currentTarget, that);
2306 if (explicitParamTypes != null) {
2307 currentTarget = infer.instantiateFunctionalInterface(that,
2308 currentTarget, explicitParamTypes, resultInfo.checkContext);
2309 }
2310 currentTarget = types.removeWildcards(currentTarget);
2311 lambdaType = types.findDescriptorType(currentTarget);
2312 } else {
2313 currentTarget = Type.recoveryType;
2314 lambdaType = fallbackDescriptorType(that);
2315 }
2317 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2319 if (lambdaType.hasTag(FORALL)) {
2320 //lambda expression target desc cannot be a generic method
2321 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2322 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2323 result = that.type = types.createErrorType(pt());
2324 return;
2325 }
2327 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2328 //add param type info in the AST
2329 List<Type> actuals = lambdaType.getParameterTypes();
2330 List<JCVariableDecl> params = that.params;
2332 boolean arityMismatch = false;
2334 while (params.nonEmpty()) {
2335 if (actuals.isEmpty()) {
2336 //not enough actuals to perform lambda parameter inference
2337 arityMismatch = true;
2338 }
2339 //reset previously set info
2340 Type argType = arityMismatch ?
2341 syms.errType :
2342 actuals.head;
2343 params.head.vartype = make.at(params.head).Type(argType);
2344 params.head.sym = null;
2345 actuals = actuals.isEmpty() ?
2346 actuals :
2347 actuals.tail;
2348 params = params.tail;
2349 }
2351 //attribute lambda parameters
2352 attribStats(that.params, localEnv);
2354 if (arityMismatch) {
2355 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2356 result = that.type = types.createErrorType(currentTarget);
2357 return;
2358 }
2359 }
2361 //from this point on, no recovery is needed; if we are in assignment context
2362 //we will be able to attribute the whole lambda body, regardless of errors;
2363 //if we are in a 'check' method context, and the lambda is not compatible
2364 //with the target-type, it will be recovered anyway in Attr.checkId
2365 needsRecovery = false;
2367 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2368 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2369 new FunctionalReturnContext(resultInfo.checkContext);
2371 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2372 recoveryInfo :
2373 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2374 localEnv.info.returnResult = bodyResultInfo;
2376 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2377 attribTree(that.getBody(), localEnv, bodyResultInfo);
2378 } else {
2379 JCBlock body = (JCBlock)that.body;
2380 attribStats(body.stats, localEnv);
2381 }
2383 result = check(that, currentTarget, VAL, resultInfo);
2385 boolean isSpeculativeRound =
2386 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2388 preFlow(that);
2389 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2391 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2393 if (!isSpeculativeRound) {
2394 //add thrown types as bounds to the thrown types free variables if needed:
2395 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2396 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2397 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes());
2399 chk.unhandled(inferredThrownTypes, thrownTypes);
2400 }
2402 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2403 }
2404 result = check(that, currentTarget, VAL, resultInfo);
2405 } catch (Types.FunctionDescriptorLookupError ex) {
2406 JCDiagnostic cause = ex.getDiagnostic();
2407 resultInfo.checkContext.report(that, cause);
2408 result = that.type = types.createErrorType(pt());
2409 return;
2410 } finally {
2411 localEnv.info.scope.leave();
2412 if (needsRecovery) {
2413 attribTree(that, env, recoveryInfo);
2414 }
2415 }
2416 }
2417 //where
2418 void preFlow(JCLambda tree) {
2419 new PostAttrAnalyzer() {
2420 @Override
2421 public void scan(JCTree tree) {
2422 if (tree == null ||
2423 (tree.type != null &&
2424 tree.type == Type.stuckType)) {
2425 //don't touch stuck expressions!
2426 return;
2427 }
2428 super.scan(tree);
2429 }
2430 }.scan(tree);
2431 }
2433 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2435 @Override
2436 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2437 return t.isIntersection() ?
2438 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2439 }
2441 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2442 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2443 Type target = null;
2444 for (Type bound : ict.getExplicitComponents()) {
2445 TypeSymbol boundSym = bound.tsym;
2446 if (types.isFunctionalInterface(boundSym) &&
2447 types.findDescriptorSymbol(boundSym) == desc) {
2448 target = bound;
2449 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2450 //bound must be an interface
2451 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2452 }
2453 }
2454 return target != null ?
2455 target :
2456 ict.getExplicitComponents().head; //error recovery
2457 }
2459 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2460 ListBuffer<Type> targs = new ListBuffer<>();
2461 ListBuffer<Type> supertypes = new ListBuffer<>();
2462 for (Type i : ict.interfaces_field) {
2463 if (i.isParameterized()) {
2464 targs.appendList(i.tsym.type.allparams());
2465 }
2466 supertypes.append(i.tsym.type);
2467 }
2468 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
2469 notionalIntf.allparams_field = targs.toList();
2470 notionalIntf.tsym.flags_field |= INTERFACE;
2471 return notionalIntf.tsym;
2472 }
2474 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2475 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2476 diags.fragment(key, args)));
2477 }
2478 };
2480 private Type fallbackDescriptorType(JCExpression tree) {
2481 switch (tree.getTag()) {
2482 case LAMBDA:
2483 JCLambda lambda = (JCLambda)tree;
2484 List<Type> argtypes = List.nil();
2485 for (JCVariableDecl param : lambda.params) {
2486 argtypes = param.vartype != null ?
2487 argtypes.append(param.vartype.type) :
2488 argtypes.append(syms.errType);
2489 }
2490 return new MethodType(argtypes, Type.recoveryType,
2491 List.of(syms.throwableType), syms.methodClass);
2492 case REFERENCE:
2493 return new MethodType(List.<Type>nil(), Type.recoveryType,
2494 List.of(syms.throwableType), syms.methodClass);
2495 default:
2496 Assert.error("Cannot get here!");
2497 }
2498 return null;
2499 }
2501 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2502 final InferenceContext inferenceContext, final Type... ts) {
2503 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2504 }
2506 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2507 final InferenceContext inferenceContext, final List<Type> ts) {
2508 if (inferenceContext.free(ts)) {
2509 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2510 @Override
2511 public void typesInferred(InferenceContext inferenceContext) {
2512 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2513 }
2514 });
2515 } else {
2516 for (Type t : ts) {
2517 rs.checkAccessibleType(env, t);
2518 }
2519 }
2520 }
2522 /**
2523 * Lambda/method reference have a special check context that ensures
2524 * that i.e. a lambda return type is compatible with the expected
2525 * type according to both the inherited context and the assignment
2526 * context.
2527 */
2528 class FunctionalReturnContext extends Check.NestedCheckContext {
2530 FunctionalReturnContext(CheckContext enclosingContext) {
2531 super(enclosingContext);
2532 }
2534 @Override
2535 public boolean compatible(Type found, Type req, Warner warn) {
2536 //return type must be compatible in both current context and assignment context
2537 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn);
2538 }
2540 @Override
2541 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2542 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2543 }
2544 }
2546 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2548 JCExpression expr;
2550 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2551 super(enclosingContext);
2552 this.expr = expr;
2553 }
2555 @Override
2556 public boolean compatible(Type found, Type req, Warner warn) {
2557 //a void return is compatible with an expression statement lambda
2558 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2559 super.compatible(found, req, warn);
2560 }
2561 }
2563 /**
2564 * Lambda compatibility. Check that given return types, thrown types, parameter types
2565 * are compatible with the expected functional interface descriptor. This means that:
2566 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2567 * types must be compatible with the return type of the expected descriptor.
2568 */
2569 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2570 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2572 //return values have already been checked - but if lambda has no return
2573 //values, we must ensure that void/value compatibility is correct;
2574 //this amounts at checking that, if a lambda body can complete normally,
2575 //the descriptor's return type must be void
2576 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2577 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2578 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2579 diags.fragment("missing.ret.val", returnType)));
2580 }
2582 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2583 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2584 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2585 }
2586 }
2588 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2589 * static field and that lambda has type annotations, these annotations will
2590 * also be stored at these fake clinit methods.
2591 *
2592 * LambdaToMethod also use fake clinit methods so they can be reused.
2593 * Also as LTM is a phase subsequent to attribution, the methods from
2594 * clinits can be safely removed by LTM to save memory.
2595 */
2596 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2598 public MethodSymbol removeClinit(ClassSymbol sym) {
2599 return clinits.remove(sym);
2600 }
2602 /* This method returns an environment to be used to attribute a lambda
2603 * expression.
2604 *
2605 * The owner of this environment is a method symbol. If the current owner
2606 * is not a method, for example if the lambda is used to initialize
2607 * a field, then if the field is:
2608 *
2609 * - an instance field, we use the first constructor.
2610 * - a static field, we create a fake clinit method.
2611 */
2612 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2613 Env<AttrContext> lambdaEnv;
2614 Symbol owner = env.info.scope.owner;
2615 if (owner.kind == VAR && owner.owner.kind == TYP) {
2616 //field initializer
2617 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2618 ClassSymbol enclClass = owner.enclClass();
2619 /* if the field isn't static, then we can get the first constructor
2620 * and use it as the owner of the environment. This is what
2621 * LTM code is doing to look for type annotations so we are fine.
2622 */
2623 if ((owner.flags() & STATIC) == 0) {
2624 for (Symbol s : enclClass.members_field.getElementsByName(names.init)) {
2625 lambdaEnv.info.scope.owner = s;
2626 break;
2627 }
2628 } else {
2629 /* if the field is static then we need to create a fake clinit
2630 * method, this method can later be reused by LTM.
2631 */
2632 MethodSymbol clinit = clinits.get(enclClass);
2633 if (clinit == null) {
2634 Type clinitType = new MethodType(List.<Type>nil(),
2635 syms.voidType, List.<Type>nil(), syms.methodClass);
2636 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2637 names.clinit, clinitType, enclClass);
2638 clinit.params = List.<VarSymbol>nil();
2639 clinits.put(enclClass, clinit);
2640 }
2641 lambdaEnv.info.scope.owner = clinit;
2642 }
2643 } else {
2644 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2645 }
2646 return lambdaEnv;
2647 }
2649 @Override
2650 public void visitReference(final JCMemberReference that) {
2651 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2652 if (pt().hasTag(NONE)) {
2653 //method reference only allowed in assignment or method invocation/cast context
2654 log.error(that.pos(), "unexpected.mref");
2655 }
2656 result = that.type = types.createErrorType(pt());
2657 return;
2658 }
2659 final Env<AttrContext> localEnv = env.dup(that);
2660 try {
2661 //attribute member reference qualifier - if this is a constructor
2662 //reference, the expected kind must be a type
2663 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2665 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2666 exprType = chk.checkConstructorRefType(that.expr, exprType);
2667 if (!exprType.isErroneous() &&
2668 exprType.isRaw() &&
2669 that.typeargs != null) {
2670 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2671 diags.fragment("mref.infer.and.explicit.params"));
2672 exprType = types.createErrorType(exprType);
2673 }
2674 }
2676 if (exprType.isErroneous()) {
2677 //if the qualifier expression contains problems,
2678 //give up attribution of method reference
2679 result = that.type = exprType;
2680 return;
2681 }
2683 if (TreeInfo.isStaticSelector(that.expr, names)) {
2684 //if the qualifier is a type, validate it; raw warning check is
2685 //omitted as we don't know at this stage as to whether this is a
2686 //raw selector (because of inference)
2687 chk.validate(that.expr, env, false);
2688 }
2690 //attrib type-arguments
2691 List<Type> typeargtypes = List.nil();
2692 if (that.typeargs != null) {
2693 typeargtypes = attribTypes(that.typeargs, localEnv);
2694 }
2696 Type desc;
2697 Type currentTarget = pt();
2698 boolean isTargetSerializable =
2699 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2700 isSerializable(currentTarget);
2701 if (currentTarget != Type.recoveryType) {
2702 currentTarget = types.removeWildcards(targetChecker.visit(currentTarget, that));
2703 desc = types.findDescriptorType(currentTarget);
2704 } else {
2705 currentTarget = Type.recoveryType;
2706 desc = fallbackDescriptorType(that);
2707 }
2709 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
2710 List<Type> argtypes = desc.getParameterTypes();
2711 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2713 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2714 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2715 }
2717 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2718 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2719 try {
2720 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
2721 that.name, argtypes, typeargtypes, referenceCheck,
2722 resultInfo.checkContext.inferenceContext(),
2723 resultInfo.checkContext.deferredAttrContext().mode);
2724 } finally {
2725 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2726 }
2728 Symbol refSym = refResult.fst;
2729 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2731 if (refSym.kind != MTH) {
2732 boolean targetError;
2733 switch (refSym.kind) {
2734 case ABSENT_MTH:
2735 targetError = false;
2736 break;
2737 case WRONG_MTH:
2738 case WRONG_MTHS:
2739 case AMBIGUOUS:
2740 case HIDDEN:
2741 case STATICERR:
2742 case MISSING_ENCL:
2743 case WRONG_STATICNESS:
2744 targetError = true;
2745 break;
2746 default:
2747 Assert.error("unexpected result kind " + refSym.kind);
2748 targetError = false;
2749 }
2751 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2752 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2754 JCDiagnostic.DiagnosticType diagKind = targetError ?
2755 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2757 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2758 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2760 if (targetError && currentTarget == Type.recoveryType) {
2761 //a target error doesn't make sense during recovery stage
2762 //as we don't know what actual parameter types are
2763 result = that.type = currentTarget;
2764 return;
2765 } else {
2766 if (targetError) {
2767 resultInfo.checkContext.report(that, diag);
2768 } else {
2769 log.report(diag);
2770 }
2771 result = that.type = types.createErrorType(currentTarget);
2772 return;
2773 }
2774 }
2776 that.sym = refSym.baseSymbol();
2777 that.kind = lookupHelper.referenceKind(that.sym);
2778 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2780 if (desc.getReturnType() == Type.recoveryType) {
2781 // stop here
2782 result = that.type = currentTarget;
2783 return;
2784 }
2786 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2788 if (that.getMode() == ReferenceMode.INVOKE &&
2789 TreeInfo.isStaticSelector(that.expr, names) &&
2790 that.kind.isUnbound() &&
2791 !desc.getParameterTypes().head.isParameterized()) {
2792 chk.checkRaw(that.expr, localEnv);
2793 }
2795 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2796 exprType.getTypeArguments().nonEmpty()) {
2797 //static ref with class type-args
2798 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2799 diags.fragment("static.mref.with.targs"));
2800 result = that.type = types.createErrorType(currentTarget);
2801 return;
2802 }
2804 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2805 !that.kind.isUnbound()) {
2806 //no static bound mrefs
2807 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2808 diags.fragment("static.bound.mref"));
2809 result = that.type = types.createErrorType(currentTarget);
2810 return;
2811 }
2813 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2814 // Check that super-qualified symbols are not abstract (JLS)
2815 rs.checkNonAbstract(that.pos(), that.sym);
2816 }
2818 if (isTargetSerializable) {
2819 chk.checkElemAccessFromSerializableLambda(that);
2820 }
2821 }
2823 ResultInfo checkInfo =
2824 resultInfo.dup(newMethodTemplate(
2825 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2826 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
2827 new FunctionalReturnContext(resultInfo.checkContext));
2829 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2831 if (that.kind.isUnbound() &&
2832 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2833 //re-generate inference constraints for unbound receiver
2834 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
2835 //cannot happen as this has already been checked - we just need
2836 //to regenerate the inference constraints, as that has been lost
2837 //as a result of the call to inferenceContext.save()
2838 Assert.error("Can't get here");
2839 }
2840 }
2842 if (!refType.isErroneous()) {
2843 refType = types.createMethodTypeWithReturn(refType,
2844 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2845 }
2847 //go ahead with standard method reference compatibility check - note that param check
2848 //is a no-op (as this has been taken care during method applicability)
2849 boolean isSpeculativeRound =
2850 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2851 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2852 if (!isSpeculativeRound) {
2853 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
2854 }
2855 result = check(that, currentTarget, VAL, resultInfo);
2856 } catch (Types.FunctionDescriptorLookupError ex) {
2857 JCDiagnostic cause = ex.getDiagnostic();
2858 resultInfo.checkContext.report(that, cause);
2859 result = that.type = types.createErrorType(pt());
2860 return;
2861 }
2862 }
2863 //where
2864 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2865 //if this is a constructor reference, the expected kind must be a type
2866 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2867 }
2870 @SuppressWarnings("fallthrough")
2871 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2872 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2874 Type resType;
2875 switch (tree.getMode()) {
2876 case NEW:
2877 if (!tree.expr.type.isRaw()) {
2878 resType = tree.expr.type;
2879 break;
2880 }
2881 default:
2882 resType = refType.getReturnType();
2883 }
2885 Type incompatibleReturnType = resType;
2887 if (returnType.hasTag(VOID)) {
2888 incompatibleReturnType = null;
2889 }
2891 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2892 if (resType.isErroneous() ||
2893 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2894 incompatibleReturnType = null;
2895 }
2896 }
2898 if (incompatibleReturnType != null) {
2899 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2900 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2901 }
2903 if (!speculativeAttr) {
2904 List<Type> thrownTypes = checkContext.inferenceContext().asUndetVars(descriptor.getThrownTypes());
2905 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2906 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2907 }
2908 }
2909 }
2911 /**
2912 * Set functional type info on the underlying AST. Note: as the target descriptor
2913 * might contain inference variables, we might need to register an hook in the
2914 * current inference context.
2915 */
2916 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2917 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2918 if (checkContext.inferenceContext().free(descriptorType)) {
2919 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2920 public void typesInferred(InferenceContext inferenceContext) {
2921 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2922 inferenceContext.asInstType(primaryTarget), checkContext);
2923 }
2924 });
2925 } else {
2926 ListBuffer<Type> targets = new ListBuffer<>();
2927 if (pt.hasTag(CLASS)) {
2928 if (pt.isCompound()) {
2929 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2930 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2931 if (t != primaryTarget) {
2932 targets.append(types.removeWildcards(t));
2933 }
2934 }
2935 } else {
2936 targets.append(types.removeWildcards(primaryTarget));
2937 }
2938 }
2939 fExpr.targets = targets.toList();
2940 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2941 pt != Type.recoveryType) {
2942 //check that functional interface class is well-formed
2943 try {
2944 /* Types.makeFunctionalInterfaceClass() may throw an exception
2945 * when it's executed post-inference. See the listener code
2946 * above.
2947 */
2948 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2949 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2950 if (csym != null) {
2951 chk.checkImplementations(env.tree, csym, csym);
2952 }
2953 } catch (Types.FunctionDescriptorLookupError ex) {
2954 JCDiagnostic cause = ex.getDiagnostic();
2955 resultInfo.checkContext.report(env.tree, cause);
2956 }
2957 }
2958 }
2959 }
2961 public void visitParens(JCParens tree) {
2962 Type owntype = attribTree(tree.expr, env, resultInfo);
2963 result = check(tree, owntype, pkind(), resultInfo);
2964 Symbol sym = TreeInfo.symbol(tree);
2965 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2966 log.error(tree.pos(), "illegal.start.of.type");
2967 }
2969 public void visitAssign(JCAssign tree) {
2970 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2971 Type capturedType = capture(owntype);
2972 attribExpr(tree.rhs, env, owntype);
2973 result = check(tree, capturedType, VAL, resultInfo);
2974 }
2976 public void visitAssignop(JCAssignOp tree) {
2977 // Attribute arguments.
2978 Type owntype = attribTree(tree.lhs, env, varInfo);
2979 Type operand = attribExpr(tree.rhs, env);
2980 // Find operator.
2981 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2982 tree.pos(), tree.getTag().noAssignOp(), env,
2983 owntype, operand);
2985 if (operator.kind == MTH &&
2986 !owntype.isErroneous() &&
2987 !operand.isErroneous()) {
2988 chk.checkOperator(tree.pos(),
2989 (OperatorSymbol)operator,
2990 tree.getTag().noAssignOp(),
2991 owntype,
2992 operand);
2993 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2994 chk.checkCastable(tree.rhs.pos(),
2995 operator.type.getReturnType(),
2996 owntype);
2997 }
2998 result = check(tree, owntype, VAL, resultInfo);
2999 }
3001 public void visitUnary(JCUnary tree) {
3002 // Attribute arguments.
3003 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3004 ? attribTree(tree.arg, env, varInfo)
3005 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3007 // Find operator.
3008 Symbol operator = tree.operator =
3009 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
3011 Type owntype = types.createErrorType(tree.type);
3012 if (operator.kind == MTH &&
3013 !argtype.isErroneous()) {
3014 owntype = (tree.getTag().isIncOrDecUnaryOp())
3015 ? tree.arg.type
3016 : operator.type.getReturnType();
3017 int opc = ((OperatorSymbol)operator).opcode;
3019 // If the argument is constant, fold it.
3020 if (argtype.constValue() != null) {
3021 Type ctype = cfolder.fold1(opc, argtype);
3022 if (ctype != null) {
3023 owntype = cfolder.coerce(ctype, owntype);
3024 }
3025 }
3026 }
3027 result = check(tree, owntype, VAL, resultInfo);
3028 }
3030 public void visitBinary(JCBinary tree) {
3031 // Attribute arguments.
3032 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3033 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3035 // Find operator.
3036 Symbol operator = tree.operator =
3037 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3039 Type owntype = types.createErrorType(tree.type);
3040 if (operator.kind == MTH &&
3041 !left.isErroneous() &&
3042 !right.isErroneous()) {
3043 owntype = operator.type.getReturnType();
3044 // This will figure out when unboxing can happen and
3045 // choose the right comparison operator.
3046 int opc = chk.checkOperator(tree.lhs.pos(),
3047 (OperatorSymbol)operator,
3048 tree.getTag(),
3049 left,
3050 right);
3052 // If both arguments are constants, fold them.
3053 if (left.constValue() != null && right.constValue() != null) {
3054 Type ctype = cfolder.fold2(opc, left, right);
3055 if (ctype != null) {
3056 owntype = cfolder.coerce(ctype, owntype);
3057 }
3058 }
3060 // Check that argument types of a reference ==, != are
3061 // castable to each other, (JLS 15.21). Note: unboxing
3062 // comparisons will not have an acmp* opc at this point.
3063 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3064 if (!types.isEqualityComparable(left, right,
3065 new Warner(tree.pos()))) {
3066 log.error(tree.pos(), "incomparable.types", left, right);
3067 }
3068 }
3070 chk.checkDivZero(tree.rhs.pos(), operator, right);
3071 }
3072 result = check(tree, owntype, VAL, resultInfo);
3073 }
3075 public void visitTypeCast(final JCTypeCast tree) {
3076 Type clazztype = attribType(tree.clazz, env);
3077 chk.validate(tree.clazz, env, false);
3078 //a fresh environment is required for 292 inference to work properly ---
3079 //see Infer.instantiatePolymorphicSignatureInstance()
3080 Env<AttrContext> localEnv = env.dup(tree);
3081 //should we propagate the target type?
3082 final ResultInfo castInfo;
3083 JCExpression expr = TreeInfo.skipParens(tree.expr);
3084 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3085 if (isPoly) {
3086 //expression is a poly - we need to propagate target type info
3087 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3088 @Override
3089 public boolean compatible(Type found, Type req, Warner warn) {
3090 return types.isCastable(found, req, warn);
3091 }
3092 });
3093 } else {
3094 //standalone cast - target-type info is not propagated
3095 castInfo = unknownExprInfo;
3096 }
3097 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3098 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3099 if (exprtype.constValue() != null)
3100 owntype = cfolder.coerce(exprtype, owntype);
3101 result = check(tree, capture(owntype), VAL, resultInfo);
3102 if (!isPoly)
3103 chk.checkRedundantCast(localEnv, tree);
3104 }
3106 public void visitTypeTest(JCInstanceOf tree) {
3107 Type exprtype = chk.checkNullOrRefType(
3108 tree.expr.pos(), attribExpr(tree.expr, env));
3109 Type clazztype = attribType(tree.clazz, env);
3110 if (!clazztype.hasTag(TYPEVAR)) {
3111 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3112 }
3113 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3114 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3115 clazztype = types.createErrorType(clazztype);
3116 }
3117 chk.validate(tree.clazz, env, false);
3118 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3119 result = check(tree, syms.booleanType, VAL, resultInfo);
3120 }
3122 public void visitIndexed(JCArrayAccess tree) {
3123 Type owntype = types.createErrorType(tree.type);
3124 Type atype = attribExpr(tree.indexed, env);
3125 attribExpr(tree.index, env, syms.intType);
3126 if (types.isArray(atype))
3127 owntype = types.elemtype(atype);
3128 else if (!atype.hasTag(ERROR))
3129 log.error(tree.pos(), "array.req.but.found", atype);
3130 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3131 result = check(tree, owntype, VAR, resultInfo);
3132 }
3134 public void visitIdent(JCIdent tree) {
3135 Symbol sym;
3137 // Find symbol
3138 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3139 // If we are looking for a method, the prototype `pt' will be a
3140 // method type with the type of the call's arguments as parameters.
3141 env.info.pendingResolutionPhase = null;
3142 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3143 } else if (tree.sym != null && tree.sym.kind != VAR) {
3144 sym = tree.sym;
3145 } else {
3146 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3147 }
3148 tree.sym = sym;
3150 // (1) Also find the environment current for the class where
3151 // sym is defined (`symEnv').
3152 // Only for pre-tiger versions (1.4 and earlier):
3153 // (2) Also determine whether we access symbol out of an anonymous
3154 // class in a this or super call. This is illegal for instance
3155 // members since such classes don't carry a this$n link.
3156 // (`noOuterThisPath').
3157 Env<AttrContext> symEnv = env;
3158 boolean noOuterThisPath = false;
3159 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3160 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3161 sym.owner.kind == TYP &&
3162 tree.name != names._this && tree.name != names._super) {
3164 // Find environment in which identifier is defined.
3165 while (symEnv.outer != null &&
3166 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3167 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3168 noOuterThisPath = !allowAnonOuterThis;
3169 symEnv = symEnv.outer;
3170 }
3171 }
3173 // If symbol is a variable, ...
3174 if (sym.kind == VAR) {
3175 VarSymbol v = (VarSymbol)sym;
3177 // ..., evaluate its initializer, if it has one, and check for
3178 // illegal forward reference.
3179 checkInit(tree, env, v, false);
3181 // If we are expecting a variable (as opposed to a value), check
3182 // that the variable is assignable in the current environment.
3183 if (pkind() == VAR)
3184 checkAssignable(tree.pos(), v, null, env);
3185 }
3187 // In a constructor body,
3188 // if symbol is a field or instance method, check that it is
3189 // not accessed before the supertype constructor is called.
3190 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3191 (sym.kind & (VAR | MTH)) != 0 &&
3192 sym.owner.kind == TYP &&
3193 (sym.flags() & STATIC) == 0) {
3194 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3195 }
3196 Env<AttrContext> env1 = env;
3197 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3198 // If the found symbol is inaccessible, then it is
3199 // accessed through an enclosing instance. Locate this
3200 // enclosing instance:
3201 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3202 env1 = env1.outer;
3203 }
3205 if (env.info.isSerializable) {
3206 chk.checkElemAccessFromSerializableLambda(tree);
3207 }
3209 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3210 }
3212 public void visitSelect(JCFieldAccess tree) {
3213 // Determine the expected kind of the qualifier expression.
3214 int skind = 0;
3215 if (tree.name == names._this || tree.name == names._super ||
3216 tree.name == names._class)
3217 {
3218 skind = TYP;
3219 } else {
3220 if ((pkind() & PCK) != 0) skind = skind | PCK;
3221 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3222 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3223 }
3225 // Attribute the qualifier expression, and determine its symbol (if any).
3226 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3227 if ((pkind() & (PCK | TYP)) == 0)
3228 site = capture(site); // Capture field access
3230 // don't allow T.class T[].class, etc
3231 if (skind == TYP) {
3232 Type elt = site;
3233 while (elt.hasTag(ARRAY))
3234 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3235 if (elt.hasTag(TYPEVAR)) {
3236 log.error(tree.pos(), "type.var.cant.be.deref");
3237 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
3238 tree.sym = tree.type.tsym;
3239 return ;
3240 }
3241 }
3243 // If qualifier symbol is a type or `super', assert `selectSuper'
3244 // for the selection. This is relevant for determining whether
3245 // protected symbols are accessible.
3246 Symbol sitesym = TreeInfo.symbol(tree.selected);
3247 boolean selectSuperPrev = env.info.selectSuper;
3248 env.info.selectSuper =
3249 sitesym != null &&
3250 sitesym.name == names._super;
3252 // Determine the symbol represented by the selection.
3253 env.info.pendingResolutionPhase = null;
3254 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3255 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
3256 log.error(tree.selected.pos(), "not.encl.class", site.tsym);
3257 sym = syms.errSymbol;
3258 }
3259 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3260 site = capture(site);
3261 sym = selectSym(tree, sitesym, site, env, resultInfo);
3262 }
3263 boolean varArgs = env.info.lastResolveVarargs();
3264 tree.sym = sym;
3266 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3267 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3268 site = capture(site);
3269 }
3271 // If that symbol is a variable, ...
3272 if (sym.kind == VAR) {
3273 VarSymbol v = (VarSymbol)sym;
3275 // ..., evaluate its initializer, if it has one, and check for
3276 // illegal forward reference.
3277 checkInit(tree, env, v, true);
3279 // If we are expecting a variable (as opposed to a value), check
3280 // that the variable is assignable in the current environment.
3281 if (pkind() == VAR)
3282 checkAssignable(tree.pos(), v, tree.selected, env);
3283 }
3285 if (sitesym != null &&
3286 sitesym.kind == VAR &&
3287 ((VarSymbol)sitesym).isResourceVariable() &&
3288 sym.kind == MTH &&
3289 sym.name.equals(names.close) &&
3290 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3291 env.info.lint.isEnabled(LintCategory.TRY)) {
3292 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3293 }
3295 // Disallow selecting a type from an expression
3296 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3297 tree.type = check(tree.selected, pt(),
3298 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3299 }
3301 if (isType(sitesym)) {
3302 if (sym.name == names._this) {
3303 // If `C' is the currently compiled class, check that
3304 // C.this' does not appear in a call to a super(...)
3305 if (env.info.isSelfCall &&
3306 site.tsym == env.enclClass.sym) {
3307 chk.earlyRefError(tree.pos(), sym);
3308 }
3309 } else {
3310 // Check if type-qualified fields or methods are static (JLS)
3311 if ((sym.flags() & STATIC) == 0 &&
3312 !env.next.tree.hasTag(REFERENCE) &&
3313 sym.name != names._super &&
3314 (sym.kind == VAR || sym.kind == MTH)) {
3315 rs.accessBase(rs.new StaticError(sym),
3316 tree.pos(), site, sym.name, true);
3317 }
3318 }
3319 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
3320 sym.isStatic() && sym.kind == MTH) {
3321 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName);
3322 }
3323 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3324 // If the qualified item is not a type and the selected item is static, report
3325 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3326 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3327 }
3329 // If we are selecting an instance member via a `super', ...
3330 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3332 // Check that super-qualified symbols are not abstract (JLS)
3333 rs.checkNonAbstract(tree.pos(), sym);
3335 if (site.isRaw()) {
3336 // Determine argument types for site.
3337 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3338 if (site1 != null) site = site1;
3339 }
3340 }
3342 if (env.info.isSerializable) {
3343 chk.checkElemAccessFromSerializableLambda(tree);
3344 }
3346 env.info.selectSuper = selectSuperPrev;
3347 result = checkId(tree, site, sym, env, resultInfo);
3348 }
3349 //where
3350 /** Determine symbol referenced by a Select expression,
3351 *
3352 * @param tree The select tree.
3353 * @param site The type of the selected expression,
3354 * @param env The current environment.
3355 * @param resultInfo The current result.
3356 */
3357 private Symbol selectSym(JCFieldAccess tree,
3358 Symbol location,
3359 Type site,
3360 Env<AttrContext> env,
3361 ResultInfo resultInfo) {
3362 DiagnosticPosition pos = tree.pos();
3363 Name name = tree.name;
3364 switch (site.getTag()) {
3365 case PACKAGE:
3366 return rs.accessBase(
3367 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3368 pos, location, site, name, true);
3369 case ARRAY:
3370 case CLASS:
3371 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3372 return rs.resolveQualifiedMethod(
3373 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3374 } else if (name == names._this || name == names._super) {
3375 return rs.resolveSelf(pos, env, site.tsym, name);
3376 } else if (name == names._class) {
3377 // In this case, we have already made sure in
3378 // visitSelect that qualifier expression is a type.
3379 Type t = syms.classType;
3380 List<Type> typeargs = allowGenerics
3381 ? List.of(types.erasure(site))
3382 : List.<Type>nil();
3383 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3384 return new VarSymbol(
3385 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3386 } else {
3387 // We are seeing a plain identifier as selector.
3388 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3389 if ((resultInfo.pkind & ERRONEOUS) == 0)
3390 sym = rs.accessBase(sym, pos, location, site, name, true);
3391 return sym;
3392 }
3393 case WILDCARD:
3394 throw new AssertionError(tree);
3395 case TYPEVAR:
3396 // Normally, site.getUpperBound() shouldn't be null.
3397 // It should only happen during memberEnter/attribBase
3398 // when determining the super type which *must* beac
3399 // done before attributing the type variables. In
3400 // other words, we are seeing this illegal program:
3401 // class B<T> extends A<T.foo> {}
3402 Symbol sym = (site.getUpperBound() != null)
3403 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3404 : null;
3405 if (sym == null) {
3406 log.error(pos, "type.var.cant.be.deref");
3407 return syms.errSymbol;
3408 } else {
3409 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3410 rs.new AccessError(env, site, sym) :
3411 sym;
3412 rs.accessBase(sym2, pos, location, site, name, true);
3413 return sym;
3414 }
3415 case ERROR:
3416 // preserve identifier names through errors
3417 return types.createErrorType(name, site.tsym, site).tsym;
3418 default:
3419 // The qualifier expression is of a primitive type -- only
3420 // .class is allowed for these.
3421 if (name == names._class) {
3422 // In this case, we have already made sure in Select that
3423 // qualifier expression is a type.
3424 Type t = syms.classType;
3425 Type arg = types.boxedClass(site).type;
3426 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3427 return new VarSymbol(
3428 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3429 } else {
3430 log.error(pos, "cant.deref", site);
3431 return syms.errSymbol;
3432 }
3433 }
3434 }
3436 /** Determine type of identifier or select expression and check that
3437 * (1) the referenced symbol is not deprecated
3438 * (2) the symbol's type is safe (@see checkSafe)
3439 * (3) if symbol is a variable, check that its type and kind are
3440 * compatible with the prototype and protokind.
3441 * (4) if symbol is an instance field of a raw type,
3442 * which is being assigned to, issue an unchecked warning if its
3443 * type changes under erasure.
3444 * (5) if symbol is an instance method of a raw type, issue an
3445 * unchecked warning if its argument types change under erasure.
3446 * If checks succeed:
3447 * If symbol is a constant, return its constant type
3448 * else if symbol is a method, return its result type
3449 * otherwise return its type.
3450 * Otherwise return errType.
3451 *
3452 * @param tree The syntax tree representing the identifier
3453 * @param site If this is a select, the type of the selected
3454 * expression, otherwise the type of the current class.
3455 * @param sym The symbol representing the identifier.
3456 * @param env The current environment.
3457 * @param resultInfo The expected result
3458 */
3459 Type checkId(JCTree tree,
3460 Type site,
3461 Symbol sym,
3462 Env<AttrContext> env,
3463 ResultInfo resultInfo) {
3464 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3465 checkMethodId(tree, site, sym, env, resultInfo) :
3466 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3467 }
3469 Type checkMethodId(JCTree tree,
3470 Type site,
3471 Symbol sym,
3472 Env<AttrContext> env,
3473 ResultInfo resultInfo) {
3474 boolean isPolymorhicSignature =
3475 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3476 return isPolymorhicSignature ?
3477 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3478 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3479 }
3481 Type checkSigPolyMethodId(JCTree tree,
3482 Type site,
3483 Symbol sym,
3484 Env<AttrContext> env,
3485 ResultInfo resultInfo) {
3486 //recover original symbol for signature polymorphic methods
3487 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3488 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3489 return sym.type;
3490 }
3492 Type checkMethodIdInternal(JCTree tree,
3493 Type site,
3494 Symbol sym,
3495 Env<AttrContext> env,
3496 ResultInfo resultInfo) {
3497 if ((resultInfo.pkind & POLY) != 0) {
3498 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3499 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3500 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3501 return owntype;
3502 } else {
3503 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3504 }
3505 }
3507 Type checkIdInternal(JCTree tree,
3508 Type site,
3509 Symbol sym,
3510 Type pt,
3511 Env<AttrContext> env,
3512 ResultInfo resultInfo) {
3513 if (pt.isErroneous()) {
3514 return types.createErrorType(site);
3515 }
3516 Type owntype; // The computed type of this identifier occurrence.
3517 switch (sym.kind) {
3518 case TYP:
3519 // For types, the computed type equals the symbol's type,
3520 // except for two situations:
3521 owntype = sym.type;
3522 if (owntype.hasTag(CLASS)) {
3523 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3524 Type ownOuter = owntype.getEnclosingType();
3526 // (a) If the symbol's type is parameterized, erase it
3527 // because no type parameters were given.
3528 // We recover generic outer type later in visitTypeApply.
3529 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3530 owntype = types.erasure(owntype);
3531 }
3533 // (b) If the symbol's type is an inner class, then
3534 // we have to interpret its outer type as a superclass
3535 // of the site type. Example:
3536 //
3537 // class Tree<A> { class Visitor { ... } }
3538 // class PointTree extends Tree<Point> { ... }
3539 // ...PointTree.Visitor...
3540 //
3541 // Then the type of the last expression above is
3542 // Tree<Point>.Visitor.
3543 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3544 Type normOuter = site;
3545 if (normOuter.hasTag(CLASS)) {
3546 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3547 }
3548 if (normOuter == null) // perhaps from an import
3549 normOuter = types.erasure(ownOuter);
3550 if (normOuter != ownOuter)
3551 owntype = new ClassType(
3552 normOuter, List.<Type>nil(), owntype.tsym);
3553 }
3554 }
3555 break;
3556 case VAR:
3557 VarSymbol v = (VarSymbol)sym;
3558 // Test (4): if symbol is an instance field of a raw type,
3559 // which is being assigned to, issue an unchecked warning if
3560 // its type changes under erasure.
3561 if (allowGenerics &&
3562 resultInfo.pkind == VAR &&
3563 v.owner.kind == TYP &&
3564 (v.flags() & STATIC) == 0 &&
3565 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3566 Type s = types.asOuterSuper(site, v.owner);
3567 if (s != null &&
3568 s.isRaw() &&
3569 !types.isSameType(v.type, v.erasure(types))) {
3570 chk.warnUnchecked(tree.pos(),
3571 "unchecked.assign.to.var",
3572 v, s);
3573 }
3574 }
3575 // The computed type of a variable is the type of the
3576 // variable symbol, taken as a member of the site type.
3577 owntype = (sym.owner.kind == TYP &&
3578 sym.name != names._this && sym.name != names._super)
3579 ? types.memberType(site, sym)
3580 : sym.type;
3582 // If the variable is a constant, record constant value in
3583 // computed type.
3584 if (v.getConstValue() != null && isStaticReference(tree))
3585 owntype = owntype.constType(v.getConstValue());
3587 if (resultInfo.pkind == VAL) {
3588 owntype = capture(owntype); // capture "names as expressions"
3589 }
3590 break;
3591 case MTH: {
3592 owntype = checkMethod(site, sym,
3593 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3594 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3595 resultInfo.pt.getTypeArguments());
3596 break;
3597 }
3598 case PCK: case ERR:
3599 owntype = sym.type;
3600 break;
3601 default:
3602 throw new AssertionError("unexpected kind: " + sym.kind +
3603 " in tree " + tree);
3604 }
3606 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3607 // (for constructors, the error was given when the constructor was
3608 // resolved)
3610 if (sym.name != names.init) {
3611 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3612 chk.checkSunAPI(tree.pos(), sym);
3613 chk.checkProfile(tree.pos(), sym);
3614 }
3616 // Test (3): if symbol is a variable, check that its type and
3617 // kind are compatible with the prototype and protokind.
3618 return check(tree, owntype, sym.kind, resultInfo);
3619 }
3621 /** Check that variable is initialized and evaluate the variable's
3622 * initializer, if not yet done. Also check that variable is not
3623 * referenced before it is defined.
3624 * @param tree The tree making up the variable reference.
3625 * @param env The current environment.
3626 * @param v The variable's symbol.
3627 */
3628 private void checkInit(JCTree tree,
3629 Env<AttrContext> env,
3630 VarSymbol v,
3631 boolean onlyWarning) {
3632 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3633 // tree.pos + " " + v.pos + " " +
3634 // Resolve.isStatic(env));//DEBUG
3636 // A forward reference is diagnosed if the declaration position
3637 // of the variable is greater than the current tree position
3638 // and the tree and variable definition occur in the same class
3639 // definition. Note that writes don't count as references.
3640 // This check applies only to class and instance
3641 // variables. Local variables follow different scope rules,
3642 // and are subject to definite assignment checking.
3643 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3644 v.owner.kind == TYP &&
3645 enclosingInitEnv(env) != null &&
3646 v.owner == env.info.scope.owner.enclClass() &&
3647 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3648 (!env.tree.hasTag(ASSIGN) ||
3649 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3650 String suffix = (env.info.enclVar == v) ?
3651 "self.ref" : "forward.ref";
3652 if (!onlyWarning || isStaticEnumField(v)) {
3653 log.error(tree.pos(), "illegal." + suffix);
3654 } else if (useBeforeDeclarationWarning) {
3655 log.warning(tree.pos(), suffix, v);
3656 }
3657 }
3659 v.getConstValue(); // ensure initializer is evaluated
3661 checkEnumInitializer(tree, env, v);
3662 }
3664 /**
3665 * Returns the enclosing init environment associated with this env (if any). An init env
3666 * can be either a field declaration env or a static/instance initializer env.
3667 */
3668 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
3669 while (true) {
3670 switch (env.tree.getTag()) {
3671 case VARDEF:
3672 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
3673 if (vdecl.sym.owner.kind == TYP) {
3674 //field
3675 return env;
3676 }
3677 break;
3678 case BLOCK:
3679 if (env.next.tree.hasTag(CLASSDEF)) {
3680 //instance/static initializer
3681 return env;
3682 }
3683 break;
3684 case METHODDEF:
3685 case CLASSDEF:
3686 case TOPLEVEL:
3687 return null;
3688 }
3689 Assert.checkNonNull(env.next);
3690 env = env.next;
3691 }
3692 }
3694 /**
3695 * Check for illegal references to static members of enum. In
3696 * an enum type, constructors and initializers may not
3697 * reference its static members unless they are constant.
3698 *
3699 * @param tree The tree making up the variable reference.
3700 * @param env The current environment.
3701 * @param v The variable's symbol.
3702 * @jls section 8.9 Enums
3703 */
3704 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3705 // JLS:
3706 //
3707 // "It is a compile-time error to reference a static field
3708 // of an enum type that is not a compile-time constant
3709 // (15.28) from constructors, instance initializer blocks,
3710 // or instance variable initializer expressions of that
3711 // type. It is a compile-time error for the constructors,
3712 // instance initializer blocks, or instance variable
3713 // initializer expressions of an enum constant e to refer
3714 // to itself or to an enum constant of the same type that
3715 // is declared to the right of e."
3716 if (isStaticEnumField(v)) {
3717 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3719 if (enclClass == null || enclClass.owner == null)
3720 return;
3722 // See if the enclosing class is the enum (or a
3723 // subclass thereof) declaring v. If not, this
3724 // reference is OK.
3725 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3726 return;
3728 // If the reference isn't from an initializer, then
3729 // the reference is OK.
3730 if (!Resolve.isInitializer(env))
3731 return;
3733 log.error(tree.pos(), "illegal.enum.static.ref");
3734 }
3735 }
3737 /** Is the given symbol a static, non-constant field of an Enum?
3738 * Note: enum literals should not be regarded as such
3739 */
3740 private boolean isStaticEnumField(VarSymbol v) {
3741 return Flags.isEnum(v.owner) &&
3742 Flags.isStatic(v) &&
3743 !Flags.isConstant(v) &&
3744 v.name != names._class;
3745 }
3747 Warner noteWarner = new Warner();
3749 /**
3750 * Check that method arguments conform to its instantiation.
3751 **/
3752 public Type checkMethod(Type site,
3753 final Symbol sym,
3754 ResultInfo resultInfo,
3755 Env<AttrContext> env,
3756 final List<JCExpression> argtrees,
3757 List<Type> argtypes,
3758 List<Type> typeargtypes) {
3759 // Test (5): if symbol is an instance method of a raw type, issue
3760 // an unchecked warning if its argument types change under erasure.
3761 if (allowGenerics &&
3762 (sym.flags() & STATIC) == 0 &&
3763 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3764 Type s = types.asOuterSuper(site, sym.owner);
3765 if (s != null && s.isRaw() &&
3766 !types.isSameTypes(sym.type.getParameterTypes(),
3767 sym.erasure(types).getParameterTypes())) {
3768 chk.warnUnchecked(env.tree.pos(),
3769 "unchecked.call.mbr.of.raw.type",
3770 sym, s);
3771 }
3772 }
3774 if (env.info.defaultSuperCallSite != null) {
3775 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3776 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3777 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3778 List<MethodSymbol> icand_sup =
3779 types.interfaceCandidates(sup, (MethodSymbol)sym);
3780 if (icand_sup.nonEmpty() &&
3781 icand_sup.head != sym &&
3782 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3783 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3784 diags.fragment("overridden.default", sym, sup));
3785 break;
3786 }
3787 }
3788 env.info.defaultSuperCallSite = null;
3789 }
3791 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3792 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3793 if (app.meth.hasTag(SELECT) &&
3794 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3795 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3796 }
3797 }
3799 // Compute the identifier's instantiated type.
3800 // For methods, we need to compute the instance type by
3801 // Resolve.instantiate from the symbol's type as well as
3802 // any type arguments and value arguments.
3803 noteWarner.clear();
3804 try {
3805 Type owntype = rs.checkMethod(
3806 env,
3807 site,
3808 sym,
3809 resultInfo,
3810 argtypes,
3811 typeargtypes,
3812 noteWarner);
3814 DeferredAttr.DeferredTypeMap checkDeferredMap =
3815 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3817 argtypes = Type.map(argtypes, checkDeferredMap);
3819 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3820 chk.warnUnchecked(env.tree.pos(),
3821 "unchecked.meth.invocation.applied",
3822 kindName(sym),
3823 sym.name,
3824 rs.methodArguments(sym.type.getParameterTypes()),
3825 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3826 kindName(sym.location()),
3827 sym.location());
3828 owntype = new MethodType(owntype.getParameterTypes(),
3829 types.erasure(owntype.getReturnType()),
3830 types.erasure(owntype.getThrownTypes()),
3831 syms.methodClass);
3832 }
3834 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3835 resultInfo.checkContext.inferenceContext());
3836 } catch (Infer.InferenceException ex) {
3837 //invalid target type - propagate exception outwards or report error
3838 //depending on the current check context
3839 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3840 return types.createErrorType(site);
3841 } catch (Resolve.InapplicableMethodException ex) {
3842 final JCDiagnostic diag = ex.getDiagnostic();
3843 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3844 @Override
3845 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3846 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3847 }
3848 };
3849 List<Type> argtypes2 = Type.map(argtypes,
3850 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3851 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3852 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3853 log.report(errDiag);
3854 return types.createErrorType(site);
3855 }
3856 }
3858 public void visitLiteral(JCLiteral tree) {
3859 result = check(
3860 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3861 }
3862 //where
3863 /** Return the type of a literal with given type tag.
3864 */
3865 Type litType(TypeTag tag) {
3866 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3867 }
3869 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3870 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3871 }
3873 public void visitTypeArray(JCArrayTypeTree tree) {
3874 Type etype = attribType(tree.elemtype, env);
3875 Type type = new ArrayType(etype, syms.arrayClass);
3876 result = check(tree, type, TYP, resultInfo);
3877 }
3879 /** Visitor method for parameterized types.
3880 * Bound checking is left until later, since types are attributed
3881 * before supertype structure is completely known
3882 */
3883 public void visitTypeApply(JCTypeApply tree) {
3884 Type owntype = types.createErrorType(tree.type);
3886 // Attribute functor part of application and make sure it's a class.
3887 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3889 // Attribute type parameters
3890 List<Type> actuals = attribTypes(tree.arguments, env);
3892 if (clazztype.hasTag(CLASS)) {
3893 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3894 if (actuals.isEmpty()) //diamond
3895 actuals = formals;
3897 if (actuals.length() == formals.length()) {
3898 List<Type> a = actuals;
3899 List<Type> f = formals;
3900 while (a.nonEmpty()) {
3901 a.head = a.head.withTypeVar(f.head);
3902 a = a.tail;
3903 f = f.tail;
3904 }
3905 // Compute the proper generic outer
3906 Type clazzOuter = clazztype.getEnclosingType();
3907 if (clazzOuter.hasTag(CLASS)) {
3908 Type site;
3909 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3910 if (clazz.hasTag(IDENT)) {
3911 site = env.enclClass.sym.type;
3912 } else if (clazz.hasTag(SELECT)) {
3913 site = ((JCFieldAccess) clazz).selected.type;
3914 } else throw new AssertionError(""+tree);
3915 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3916 if (site.hasTag(CLASS))
3917 site = types.asOuterSuper(site, clazzOuter.tsym);
3918 if (site == null)
3919 site = types.erasure(clazzOuter);
3920 clazzOuter = site;
3921 }
3922 }
3923 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3924 } else {
3925 if (formals.length() != 0) {
3926 log.error(tree.pos(), "wrong.number.type.args",
3927 Integer.toString(formals.length()));
3928 } else {
3929 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3930 }
3931 owntype = types.createErrorType(tree.type);
3932 }
3933 }
3934 result = check(tree, owntype, TYP, resultInfo);
3935 }
3937 public void visitTypeUnion(JCTypeUnion tree) {
3938 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3939 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3940 for (JCExpression typeTree : tree.alternatives) {
3941 Type ctype = attribType(typeTree, env);
3942 ctype = chk.checkType(typeTree.pos(),
3943 chk.checkClassType(typeTree.pos(), ctype),
3944 syms.throwableType);
3945 if (!ctype.isErroneous()) {
3946 //check that alternatives of a union type are pairwise
3947 //unrelated w.r.t. subtyping
3948 if (chk.intersects(ctype, multicatchTypes.toList())) {
3949 for (Type t : multicatchTypes) {
3950 boolean sub = types.isSubtype(ctype, t);
3951 boolean sup = types.isSubtype(t, ctype);
3952 if (sub || sup) {
3953 //assume 'a' <: 'b'
3954 Type a = sub ? ctype : t;
3955 Type b = sub ? t : ctype;
3956 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3957 }
3958 }
3959 }
3960 multicatchTypes.append(ctype);
3961 if (all_multicatchTypes != null)
3962 all_multicatchTypes.append(ctype);
3963 } else {
3964 if (all_multicatchTypes == null) {
3965 all_multicatchTypes = new ListBuffer<>();
3966 all_multicatchTypes.appendList(multicatchTypes);
3967 }
3968 all_multicatchTypes.append(ctype);
3969 }
3970 }
3971 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3972 if (t.hasTag(CLASS)) {
3973 List<Type> alternatives =
3974 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3975 t = new UnionClassType((ClassType) t, alternatives);
3976 }
3977 tree.type = result = t;
3978 }
3980 public void visitTypeIntersection(JCTypeIntersection tree) {
3981 attribTypes(tree.bounds, env);
3982 tree.type = result = checkIntersection(tree, tree.bounds);
3983 }
3985 public void visitTypeParameter(JCTypeParameter tree) {
3986 TypeVar typeVar = (TypeVar) tree.type;
3988 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3989 annotateType(tree, tree.annotations);
3990 }
3992 if (!typeVar.bound.isErroneous()) {
3993 //fixup type-parameter bound computed in 'attribTypeVariables'
3994 typeVar.bound = checkIntersection(tree, tree.bounds);
3995 }
3996 }
3998 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3999 Set<Type> boundSet = new HashSet<Type>();
4000 if (bounds.nonEmpty()) {
4001 // accept class or interface or typevar as first bound.
4002 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4003 boundSet.add(types.erasure(bounds.head.type));
4004 if (bounds.head.type.isErroneous()) {
4005 return bounds.head.type;
4006 }
4007 else if (bounds.head.type.hasTag(TYPEVAR)) {
4008 // if first bound was a typevar, do not accept further bounds.
4009 if (bounds.tail.nonEmpty()) {
4010 log.error(bounds.tail.head.pos(),
4011 "type.var.may.not.be.followed.by.other.bounds");
4012 return bounds.head.type;
4013 }
4014 } else {
4015 // if first bound was a class or interface, accept only interfaces
4016 // as further bounds.
4017 for (JCExpression bound : bounds.tail) {
4018 bound.type = checkBase(bound.type, bound, env, false, true, false);
4019 if (bound.type.isErroneous()) {
4020 bounds = List.of(bound);
4021 }
4022 else if (bound.type.hasTag(CLASS)) {
4023 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4024 }
4025 }
4026 }
4027 }
4029 if (bounds.length() == 0) {
4030 return syms.objectType;
4031 } else if (bounds.length() == 1) {
4032 return bounds.head.type;
4033 } else {
4034 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
4035 // ... the variable's bound is a class type flagged COMPOUND
4036 // (see comment for TypeVar.bound).
4037 // In this case, generate a class tree that represents the
4038 // bound class, ...
4039 JCExpression extending;
4040 List<JCExpression> implementing;
4041 if (!bounds.head.type.isInterface()) {
4042 extending = bounds.head;
4043 implementing = bounds.tail;
4044 } else {
4045 extending = null;
4046 implementing = bounds;
4047 }
4048 JCClassDecl cd = make.at(tree).ClassDef(
4049 make.Modifiers(PUBLIC | ABSTRACT),
4050 names.empty, List.<JCTypeParameter>nil(),
4051 extending, implementing, List.<JCTree>nil());
4053 ClassSymbol c = (ClassSymbol)owntype.tsym;
4054 Assert.check((c.flags() & COMPOUND) != 0);
4055 cd.sym = c;
4056 c.sourcefile = env.toplevel.sourcefile;
4058 // ... and attribute the bound class
4059 c.flags_field |= UNATTRIBUTED;
4060 Env<AttrContext> cenv = enter.classEnv(cd, env);
4061 typeEnvs.put(c, cenv);
4062 attribClass(c);
4063 return owntype;
4064 }
4065 }
4067 public void visitWildcard(JCWildcard tree) {
4068 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4069 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4070 ? syms.objectType
4071 : attribType(tree.inner, env);
4072 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4073 tree.kind.kind,
4074 syms.boundClass),
4075 TYP, resultInfo);
4076 }
4078 public void visitAnnotation(JCAnnotation tree) {
4079 Assert.error("should be handled in Annotate");
4080 }
4082 public void visitAnnotatedType(JCAnnotatedType tree) {
4083 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4084 this.attribAnnotationTypes(tree.annotations, env);
4085 annotateType(tree, tree.annotations);
4086 result = tree.type = underlyingType;
4087 }
4089 /**
4090 * Apply the annotations to the particular type.
4091 */
4092 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4093 annotate.typeAnnotation(new Annotate.Worker() {
4094 @Override
4095 public String toString() {
4096 return "annotate " + annotations + " onto " + tree;
4097 }
4098 @Override
4099 public void run() {
4100 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4101 if (annotations.size() == compounds.size()) {
4102 // All annotations were successfully converted into compounds
4103 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4104 }
4105 }
4106 });
4107 }
4109 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4110 if (annotations.isEmpty()) {
4111 return List.nil();
4112 }
4114 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4115 for (JCAnnotation anno : annotations) {
4116 if (anno.attribute != null) {
4117 // TODO: this null-check is only needed for an obscure
4118 // ordering issue, where annotate.flush is called when
4119 // the attribute is not set yet. For an example failure
4120 // try the referenceinfos/NestedTypes.java test.
4121 // Any better solutions?
4122 buf.append((Attribute.TypeCompound) anno.attribute);
4123 }
4124 // Eventually we will want to throw an exception here, but
4125 // we can't do that just yet, because it gets triggered
4126 // when attempting to attach an annotation that isn't
4127 // defined.
4128 }
4129 return buf.toList();
4130 }
4132 public void visitErroneous(JCErroneous tree) {
4133 if (tree.errs != null)
4134 for (JCTree err : tree.errs)
4135 attribTree(err, env, new ResultInfo(ERR, pt()));
4136 result = tree.type = syms.errType;
4137 }
4139 /** Default visitor method for all other trees.
4140 */
4141 public void visitTree(JCTree tree) {
4142 throw new AssertionError();
4143 }
4145 /**
4146 * Attribute an env for either a top level tree or class declaration.
4147 */
4148 public void attrib(Env<AttrContext> env) {
4149 if (env.tree.hasTag(TOPLEVEL))
4150 attribTopLevel(env);
4151 else
4152 attribClass(env.tree.pos(), env.enclClass.sym);
4153 }
4155 /**
4156 * Attribute a top level tree. These trees are encountered when the
4157 * package declaration has annotations.
4158 */
4159 public void attribTopLevel(Env<AttrContext> env) {
4160 JCCompilationUnit toplevel = env.toplevel;
4161 try {
4162 annotate.flush();
4163 } catch (CompletionFailure ex) {
4164 chk.completionError(toplevel.pos(), ex);
4165 }
4166 }
4168 /** Main method: attribute class definition associated with given class symbol.
4169 * reporting completion failures at the given position.
4170 * @param pos The source position at which completion errors are to be
4171 * reported.
4172 * @param c The class symbol whose definition will be attributed.
4173 */
4174 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4175 try {
4176 annotate.flush();
4177 attribClass(c);
4178 } catch (CompletionFailure ex) {
4179 chk.completionError(pos, ex);
4180 }
4181 }
4183 /** Attribute class definition associated with given class symbol.
4184 * @param c The class symbol whose definition will be attributed.
4185 */
4186 void attribClass(ClassSymbol c) throws CompletionFailure {
4187 if (c.type.hasTag(ERROR)) return;
4189 // Check for cycles in the inheritance graph, which can arise from
4190 // ill-formed class files.
4191 chk.checkNonCyclic(null, c.type);
4193 Type st = types.supertype(c.type);
4194 if ((c.flags_field & Flags.COMPOUND) == 0) {
4195 // First, attribute superclass.
4196 if (st.hasTag(CLASS))
4197 attribClass((ClassSymbol)st.tsym);
4199 // Next attribute owner, if it is a class.
4200 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4201 attribClass((ClassSymbol)c.owner);
4202 }
4204 // The previous operations might have attributed the current class
4205 // if there was a cycle. So we test first whether the class is still
4206 // UNATTRIBUTED.
4207 if ((c.flags_field & UNATTRIBUTED) != 0) {
4208 c.flags_field &= ~UNATTRIBUTED;
4210 // Get environment current at the point of class definition.
4211 Env<AttrContext> env = typeEnvs.get(c);
4213 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
4214 // because the annotations were not available at the time the env was created. Therefore,
4215 // we look up the environment chain for the first enclosing environment for which the
4216 // lint value is set. Typically, this is the parent env, but might be further if there
4217 // are any envs created as a result of TypeParameter nodes.
4218 Env<AttrContext> lintEnv = env;
4219 while (lintEnv.info.lint == null)
4220 lintEnv = lintEnv.next;
4222 // Having found the enclosing lint value, we can initialize the lint value for this class
4223 env.info.lint = lintEnv.info.lint.augment(c);
4225 Lint prevLint = chk.setLint(env.info.lint);
4226 JavaFileObject prev = log.useSource(c.sourcefile);
4227 ResultInfo prevReturnRes = env.info.returnResult;
4229 try {
4230 deferredLintHandler.flush(env.tree);
4231 env.info.returnResult = null;
4232 // java.lang.Enum may not be subclassed by a non-enum
4233 if (st.tsym == syms.enumSym &&
4234 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4235 log.error(env.tree.pos(), "enum.no.subclassing");
4237 // Enums may not be extended by source-level classes
4238 if (st.tsym != null &&
4239 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4240 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4241 log.error(env.tree.pos(), "enum.types.not.extensible");
4242 }
4244 if (isSerializable(c.type)) {
4245 env.info.isSerializable = true;
4246 }
4248 attribClassBody(env, c);
4250 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4251 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4252 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4253 } finally {
4254 env.info.returnResult = prevReturnRes;
4255 log.useSource(prev);
4256 chk.setLint(prevLint);
4257 }
4259 }
4260 }
4262 public void visitImport(JCImport tree) {
4263 // nothing to do
4264 }
4266 /** Finish the attribution of a class. */
4267 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4268 JCClassDecl tree = (JCClassDecl)env.tree;
4269 Assert.check(c == tree.sym);
4271 // Validate type parameters, supertype and interfaces.
4272 attribStats(tree.typarams, env);
4273 if (!c.isAnonymous()) {
4274 //already checked if anonymous
4275 chk.validate(tree.typarams, env);
4276 chk.validate(tree.extending, env);
4277 chk.validate(tree.implementing, env);
4278 }
4280 c.markAbstractIfNeeded(types);
4282 // If this is a non-abstract class, check that it has no abstract
4283 // methods or unimplemented methods of an implemented interface.
4284 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4285 if (!relax)
4286 chk.checkAllDefined(tree.pos(), c);
4287 }
4289 if ((c.flags() & ANNOTATION) != 0) {
4290 if (tree.implementing.nonEmpty())
4291 log.error(tree.implementing.head.pos(),
4292 "cant.extend.intf.annotation");
4293 if (tree.typarams.nonEmpty())
4294 log.error(tree.typarams.head.pos(),
4295 "intf.annotation.cant.have.type.params");
4297 // If this annotation has a @Repeatable, validate
4298 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4299 if (repeatable != null) {
4300 // get diagnostic position for error reporting
4301 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4302 Assert.checkNonNull(cbPos);
4304 chk.validateRepeatable(c, repeatable, cbPos);
4305 }
4306 } else {
4307 // Check that all extended classes and interfaces
4308 // are compatible (i.e. no two define methods with same arguments
4309 // yet different return types). (JLS 8.4.6.3)
4310 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4311 if (allowDefaultMethods) {
4312 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4313 }
4314 }
4316 // Check that class does not import the same parameterized interface
4317 // with two different argument lists.
4318 chk.checkClassBounds(tree.pos(), c.type);
4320 tree.type = c.type;
4322 for (List<JCTypeParameter> l = tree.typarams;
4323 l.nonEmpty(); l = l.tail) {
4324 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4325 }
4327 // Check that a generic class doesn't extend Throwable
4328 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4329 log.error(tree.extending.pos(), "generic.throwable");
4331 // Check that all methods which implement some
4332 // method conform to the method they implement.
4333 chk.checkImplementations(tree);
4335 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4336 checkAutoCloseable(tree.pos(), env, c.type);
4338 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4339 // Attribute declaration
4340 attribStat(l.head, env);
4341 // Check that declarations in inner classes are not static (JLS 8.1.2)
4342 // Make an exception for static constants.
4343 if (c.owner.kind != PCK &&
4344 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4345 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4346 Symbol sym = null;
4347 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4348 if (sym == null ||
4349 sym.kind != VAR ||
4350 ((VarSymbol) sym).getConstValue() == null)
4351 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4352 }
4353 }
4355 // Check for cycles among non-initial constructors.
4356 chk.checkCyclicConstructors(tree);
4358 // Check for cycles among annotation elements.
4359 chk.checkNonCyclicElements(tree);
4361 // Check for proper use of serialVersionUID
4362 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4363 isSerializable(c.type) &&
4364 (c.flags() & Flags.ENUM) == 0 &&
4365 checkForSerial(c)) {
4366 checkSerialVersionUID(tree, c);
4367 }
4368 if (allowTypeAnnos) {
4369 // Correctly organize the postions of the type annotations
4370 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4372 // Check type annotations applicability rules
4373 validateTypeAnnotations(tree, false);
4374 }
4375 }
4376 // where
4377 boolean checkForSerial(ClassSymbol c) {
4378 if ((c.flags() & ABSTRACT) == 0) {
4379 return true;
4380 } else {
4381 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4382 }
4383 }
4385 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4386 @Override
4387 public boolean accepts(Symbol s) {
4388 return s.kind == Kinds.MTH &&
4389 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4390 }
4391 };
4393 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4394 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4395 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4396 if (types.isSameType(al.head.annotationType.type, t))
4397 return al.head.pos();
4398 }
4400 return null;
4401 }
4403 /** check if a type is a subtype of Serializable, if that is available. */
4404 boolean isSerializable(Type t) {
4405 try {
4406 syms.serializableType.complete();
4407 }
4408 catch (CompletionFailure e) {
4409 return false;
4410 }
4411 return types.isSubtype(t, syms.serializableType);
4412 }
4414 /** Check that an appropriate serialVersionUID member is defined. */
4415 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4417 // check for presence of serialVersionUID
4418 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4419 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4420 if (e.scope == null) {
4421 log.warning(LintCategory.SERIAL,
4422 tree.pos(), "missing.SVUID", c);
4423 return;
4424 }
4426 // check that it is static final
4427 VarSymbol svuid = (VarSymbol)e.sym;
4428 if ((svuid.flags() & (STATIC | FINAL)) !=
4429 (STATIC | FINAL))
4430 log.warning(LintCategory.SERIAL,
4431 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4433 // check that it is long
4434 else if (!svuid.type.hasTag(LONG))
4435 log.warning(LintCategory.SERIAL,
4436 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4438 // check constant
4439 else if (svuid.getConstValue() == null)
4440 log.warning(LintCategory.SERIAL,
4441 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4442 }
4444 private Type capture(Type type) {
4445 return types.capture(type);
4446 }
4448 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4449 tree.accept(new TypeAnnotationsValidator(sigOnly));
4450 }
4451 //where
4452 private final class TypeAnnotationsValidator extends TreeScanner {
4454 private final boolean sigOnly;
4455 public TypeAnnotationsValidator(boolean sigOnly) {
4456 this.sigOnly = sigOnly;
4457 }
4459 public void visitAnnotation(JCAnnotation tree) {
4460 chk.validateTypeAnnotation(tree, false);
4461 super.visitAnnotation(tree);
4462 }
4463 public void visitAnnotatedType(JCAnnotatedType tree) {
4464 if (!tree.underlyingType.type.isErroneous()) {
4465 super.visitAnnotatedType(tree);
4466 }
4467 }
4468 public void visitTypeParameter(JCTypeParameter tree) {
4469 chk.validateTypeAnnotations(tree.annotations, true);
4470 scan(tree.bounds);
4471 // Don't call super.
4472 // This is needed because above we call validateTypeAnnotation with
4473 // false, which would forbid annotations on type parameters.
4474 // super.visitTypeParameter(tree);
4475 }
4476 public void visitMethodDef(JCMethodDecl tree) {
4477 if (tree.recvparam != null &&
4478 !tree.recvparam.vartype.type.isErroneous()) {
4479 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4480 tree.recvparam.vartype.type.tsym);
4481 }
4482 if (tree.restype != null && tree.restype.type != null) {
4483 validateAnnotatedType(tree.restype, tree.restype.type);
4484 }
4485 if (sigOnly) {
4486 scan(tree.mods);
4487 scan(tree.restype);
4488 scan(tree.typarams);
4489 scan(tree.recvparam);
4490 scan(tree.params);
4491 scan(tree.thrown);
4492 } else {
4493 scan(tree.defaultValue);
4494 scan(tree.body);
4495 }
4496 }
4497 public void visitVarDef(final JCVariableDecl tree) {
4498 if (tree.sym != null && tree.sym.type != null)
4499 validateAnnotatedType(tree.vartype, tree.sym.type);
4500 scan(tree.mods);
4501 scan(tree.vartype);
4502 if (!sigOnly) {
4503 scan(tree.init);
4504 }
4505 }
4506 public void visitTypeCast(JCTypeCast tree) {
4507 if (tree.clazz != null && tree.clazz.type != null)
4508 validateAnnotatedType(tree.clazz, tree.clazz.type);
4509 super.visitTypeCast(tree);
4510 }
4511 public void visitTypeTest(JCInstanceOf tree) {
4512 if (tree.clazz != null && tree.clazz.type != null)
4513 validateAnnotatedType(tree.clazz, tree.clazz.type);
4514 super.visitTypeTest(tree);
4515 }
4516 public void visitNewClass(JCNewClass tree) {
4517 if (tree.clazz != null && tree.clazz.type != null) {
4518 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4519 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4520 tree.clazz.type.tsym);
4521 }
4522 if (tree.def != null) {
4523 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4524 }
4526 validateAnnotatedType(tree.clazz, tree.clazz.type);
4527 }
4528 super.visitNewClass(tree);
4529 }
4530 public void visitNewArray(JCNewArray tree) {
4531 if (tree.elemtype != null && tree.elemtype.type != null) {
4532 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4533 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4534 tree.elemtype.type.tsym);
4535 }
4536 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4537 }
4538 super.visitNewArray(tree);
4539 }
4540 public void visitClassDef(JCClassDecl tree) {
4541 if (sigOnly) {
4542 scan(tree.mods);
4543 scan(tree.typarams);
4544 scan(tree.extending);
4545 scan(tree.implementing);
4546 }
4547 for (JCTree member : tree.defs) {
4548 if (member.hasTag(Tag.CLASSDEF)) {
4549 continue;
4550 }
4551 scan(member);
4552 }
4553 }
4554 public void visitBlock(JCBlock tree) {
4555 if (!sigOnly) {
4556 scan(tree.stats);
4557 }
4558 }
4560 /* I would want to model this after
4561 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4562 * and override visitSelect and visitTypeApply.
4563 * However, we only set the annotated type in the top-level type
4564 * of the symbol.
4565 * Therefore, we need to override each individual location where a type
4566 * can occur.
4567 */
4568 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4569 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4571 if (type.isPrimitiveOrVoid()) {
4572 return;
4573 }
4575 JCTree enclTr = errtree;
4576 Type enclTy = type;
4578 boolean repeat = true;
4579 while (repeat) {
4580 if (enclTr.hasTag(TYPEAPPLY)) {
4581 List<Type> tyargs = enclTy.getTypeArguments();
4582 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4583 if (trargs.length() > 0) {
4584 // Nothing to do for diamonds
4585 if (tyargs.length() == trargs.length()) {
4586 for (int i = 0; i < tyargs.length(); ++i) {
4587 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4588 }
4589 }
4590 // If the lengths don't match, it's either a diamond
4591 // or some nested type that redundantly provides
4592 // type arguments in the tree.
4593 }
4595 // Look at the clazz part of a generic type
4596 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4597 }
4599 if (enclTr.hasTag(SELECT)) {
4600 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4601 if (enclTy != null &&
4602 !enclTy.hasTag(NONE)) {
4603 enclTy = enclTy.getEnclosingType();
4604 }
4605 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4606 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4607 if (enclTy == null ||
4608 enclTy.hasTag(NONE)) {
4609 if (at.getAnnotations().size() == 1) {
4610 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4611 } else {
4612 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4613 for (JCAnnotation an : at.getAnnotations()) {
4614 comps.add(an.attribute);
4615 }
4616 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4617 }
4618 repeat = false;
4619 }
4620 enclTr = at.underlyingType;
4621 // enclTy doesn't need to be changed
4622 } else if (enclTr.hasTag(IDENT)) {
4623 repeat = false;
4624 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4625 JCWildcard wc = (JCWildcard) enclTr;
4626 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4627 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4628 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4629 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4630 } else {
4631 // Nothing to do for UNBOUND
4632 }
4633 repeat = false;
4634 } else if (enclTr.hasTag(TYPEARRAY)) {
4635 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4636 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4637 repeat = false;
4638 } else if (enclTr.hasTag(TYPEUNION)) {
4639 JCTypeUnion ut = (JCTypeUnion) enclTr;
4640 for (JCTree t : ut.getTypeAlternatives()) {
4641 validateAnnotatedType(t, t.type);
4642 }
4643 repeat = false;
4644 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4645 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4646 for (JCTree t : it.getBounds()) {
4647 validateAnnotatedType(t, t.type);
4648 }
4649 repeat = false;
4650 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4651 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4652 repeat = false;
4653 } else {
4654 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4655 " within: "+ errtree + " with kind: " + errtree.getKind());
4656 }
4657 }
4658 }
4660 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
4661 Symbol sym) {
4662 // Ensure that no declaration annotations are present.
4663 // Note that a tree type might be an AnnotatedType with
4664 // empty annotations, if only declaration annotations were given.
4665 // This method will raise an error for such a type.
4666 for (JCAnnotation ai : annotations) {
4667 if (!ai.type.isErroneous() &&
4668 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
4669 log.error(ai.pos(), "annotation.type.not.applicable");
4670 }
4671 }
4672 }
4673 };
4675 // <editor-fold desc="post-attribution visitor">
4677 /**
4678 * Handle missing types/symbols in an AST. This routine is useful when
4679 * the compiler has encountered some errors (which might have ended up
4680 * terminating attribution abruptly); if the compiler is used in fail-over
4681 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4682 * prevents NPE to be progagated during subsequent compilation steps.
4683 */
4684 public void postAttr(JCTree tree) {
4685 new PostAttrAnalyzer().scan(tree);
4686 }
4688 class PostAttrAnalyzer extends TreeScanner {
4690 private void initTypeIfNeeded(JCTree that) {
4691 if (that.type == null) {
4692 if (that.hasTag(METHODDEF)) {
4693 that.type = dummyMethodType((JCMethodDecl)that);
4694 } else {
4695 that.type = syms.unknownType;
4696 }
4697 }
4698 }
4700 /* Construct a dummy method type. If we have a method declaration,
4701 * and the declared return type is void, then use that return type
4702 * instead of UNKNOWN to avoid spurious error messages in lambda
4703 * bodies (see:JDK-8041704).
4704 */
4705 private Type dummyMethodType(JCMethodDecl md) {
4706 Type restype = syms.unknownType;
4707 if (md != null && md.restype.hasTag(TYPEIDENT)) {
4708 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
4709 if (prim.typetag == VOID)
4710 restype = syms.voidType;
4711 }
4712 return new MethodType(List.<Type>nil(), restype,
4713 List.<Type>nil(), syms.methodClass);
4714 }
4715 private Type dummyMethodType() {
4716 return dummyMethodType(null);
4717 }
4719 @Override
4720 public void scan(JCTree tree) {
4721 if (tree == null) return;
4722 if (tree instanceof JCExpression) {
4723 initTypeIfNeeded(tree);
4724 }
4725 super.scan(tree);
4726 }
4728 @Override
4729 public void visitIdent(JCIdent that) {
4730 if (that.sym == null) {
4731 that.sym = syms.unknownSymbol;
4732 }
4733 }
4735 @Override
4736 public void visitSelect(JCFieldAccess that) {
4737 if (that.sym == null) {
4738 that.sym = syms.unknownSymbol;
4739 }
4740 super.visitSelect(that);
4741 }
4743 @Override
4744 public void visitClassDef(JCClassDecl that) {
4745 initTypeIfNeeded(that);
4746 if (that.sym == null) {
4747 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4748 }
4749 super.visitClassDef(that);
4750 }
4752 @Override
4753 public void visitMethodDef(JCMethodDecl that) {
4754 initTypeIfNeeded(that);
4755 if (that.sym == null) {
4756 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4757 }
4758 super.visitMethodDef(that);
4759 }
4761 @Override
4762 public void visitVarDef(JCVariableDecl that) {
4763 initTypeIfNeeded(that);
4764 if (that.sym == null) {
4765 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4766 that.sym.adr = 0;
4767 }
4768 super.visitVarDef(that);
4769 }
4771 @Override
4772 public void visitNewClass(JCNewClass that) {
4773 if (that.constructor == null) {
4774 that.constructor = new MethodSymbol(0, names.init,
4775 dummyMethodType(), syms.noSymbol);
4776 }
4777 if (that.constructorType == null) {
4778 that.constructorType = syms.unknownType;
4779 }
4780 super.visitNewClass(that);
4781 }
4783 @Override
4784 public void visitAssignop(JCAssignOp that) {
4785 if (that.operator == null) {
4786 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4787 -1, syms.noSymbol);
4788 }
4789 super.visitAssignop(that);
4790 }
4792 @Override
4793 public void visitBinary(JCBinary that) {
4794 if (that.operator == null) {
4795 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4796 -1, syms.noSymbol);
4797 }
4798 super.visitBinary(that);
4799 }
4801 @Override
4802 public void visitUnary(JCUnary that) {
4803 if (that.operator == null) {
4804 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4805 -1, syms.noSymbol);
4806 }
4807 super.visitUnary(that);
4808 }
4810 @Override
4811 public void visitLambda(JCLambda that) {
4812 super.visitLambda(that);
4813 if (that.targets == null) {
4814 that.targets = List.nil();
4815 }
4816 }
4818 @Override
4819 public void visitReference(JCMemberReference that) {
4820 super.visitReference(that);
4821 if (that.sym == null) {
4822 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
4823 syms.noSymbol);
4824 }
4825 if (that.targets == null) {
4826 that.targets = List.nil();
4827 }
4828 }
4829 }
4830 // </editor-fold>
4831 }
