Thu, 24 May 2018 16:48:51 +0800
Merge
1 /*
2 * Copyright (c) 1999, 2016, 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);
160 noCheckTree = make.at(-1).Skip();
161 }
163 /** Switch: relax some constraints for retrofit mode.
164 */
165 boolean relax;
167 /** Switch: support target-typing inference
168 */
169 boolean allowPoly;
171 /** Switch: support type annotations.
172 */
173 boolean allowTypeAnnos;
175 /** Switch: support generics?
176 */
177 boolean allowGenerics;
179 /** Switch: allow variable-arity methods.
180 */
181 boolean allowVarargs;
183 /** Switch: support enums?
184 */
185 boolean allowEnums;
187 /** Switch: support boxing and unboxing?
188 */
189 boolean allowBoxing;
191 /** Switch: support covariant result types?
192 */
193 boolean allowCovariantReturns;
195 /** Switch: support lambda expressions ?
196 */
197 boolean allowLambda;
199 /** Switch: support default methods ?
200 */
201 boolean allowDefaultMethods;
203 /** Switch: static interface methods enabled?
204 */
205 boolean allowStaticInterfaceMethods;
207 /** Switch: allow references to surrounding object from anonymous
208 * objects during constructor call?
209 */
210 boolean allowAnonOuterThis;
212 /** Switch: generates a warning if diamond can be safely applied
213 * to a given new expression
214 */
215 boolean findDiamonds;
217 /**
218 * Internally enables/disables diamond finder feature
219 */
220 static final boolean allowDiamondFinder = true;
222 /**
223 * Switch: warn about use of variable before declaration?
224 * RFE: 6425594
225 */
226 boolean useBeforeDeclarationWarning;
228 /**
229 * Switch: generate warnings whenever an anonymous inner class that is convertible
230 * to a lambda expression is found
231 */
232 boolean identifyLambdaCandidate;
234 /**
235 * Switch: allow strings in switch?
236 */
237 boolean allowStringsInSwitch;
239 /**
240 * Switch: name of source level; used for error reporting.
241 */
242 String sourceName;
244 /** Check kind and type of given tree against protokind and prototype.
245 * If check succeeds, store type in tree and return it.
246 * If check fails, store errType in tree and return it.
247 * No checks are performed if the prototype is a method type.
248 * It is not necessary in this case since we know that kind and type
249 * are correct.
250 *
251 * @param tree The tree whose kind and type is checked
252 * @param found The computed type of the tree
253 * @param ownkind The computed kind of the tree
254 * @param resultInfo The expected result of the tree
255 */
256 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
257 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
258 Type owntype;
259 boolean shouldCheck = !found.hasTag(ERROR) &&
260 !resultInfo.pt.hasTag(METHOD) &&
261 !resultInfo.pt.hasTag(FORALL);
262 if (shouldCheck && (ownkind & ~resultInfo.pkind) != 0) {
263 log.error(tree.pos(), "unexpected.type",
264 kindNames(resultInfo.pkind),
265 kindName(ownkind));
266 owntype = types.createErrorType(found);
267 } else if (allowPoly && inferenceContext.free(found)) {
268 //delay the check if there are inference variables in the found type
269 //this means we are dealing with a partially inferred poly expression
270 owntype = shouldCheck ? resultInfo.pt : found;
271 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
272 @Override
273 public void typesInferred(InferenceContext inferenceContext) {
274 ResultInfo pendingResult =
275 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
276 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
277 }
278 });
279 } else {
280 owntype = shouldCheck ?
281 resultInfo.check(tree, found) :
282 found;
283 }
284 if (tree != noCheckTree) {
285 tree.type = owntype;
286 }
287 return owntype;
288 }
290 /** Is given blank final variable assignable, i.e. in a scope where it
291 * may be assigned to even though it is final?
292 * @param v The blank final variable.
293 * @param env The current environment.
294 */
295 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
296 Symbol owner = env.info.scope.owner;
297 // owner refers to the innermost variable, method or
298 // initializer block declaration at this point.
299 return
300 v.owner == owner
301 ||
302 ((owner.name == names.init || // i.e. we are in a constructor
303 owner.kind == VAR || // i.e. we are in a variable initializer
304 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
305 &&
306 v.owner == owner.owner
307 &&
308 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
309 }
311 /** Check that variable can be assigned to.
312 * @param pos The current source code position.
313 * @param v The assigned varaible
314 * @param base If the variable is referred to in a Select, the part
315 * to the left of the `.', null otherwise.
316 * @param env The current environment.
317 */
318 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
319 if ((v.flags() & FINAL) != 0 &&
320 ((v.flags() & HASINIT) != 0
321 ||
322 !((base == null ||
323 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
324 isAssignableAsBlankFinal(v, env)))) {
325 if (v.isResourceVariable()) { //TWR resource
326 log.error(pos, "try.resource.may.not.be.assigned", v);
327 } else {
328 log.error(pos, "cant.assign.val.to.final.var", v);
329 }
330 }
331 }
333 /** Does tree represent a static reference to an identifier?
334 * It is assumed that tree is either a SELECT or an IDENT.
335 * We have to weed out selects from non-type names here.
336 * @param tree The candidate tree.
337 */
338 boolean isStaticReference(JCTree tree) {
339 if (tree.hasTag(SELECT)) {
340 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
341 if (lsym == null || lsym.kind != TYP) {
342 return false;
343 }
344 }
345 return true;
346 }
348 /** Is this symbol a type?
349 */
350 static boolean isType(Symbol sym) {
351 return sym != null && sym.kind == TYP;
352 }
354 /** The current `this' symbol.
355 * @param env The current environment.
356 */
357 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
358 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
359 }
361 /** Attribute a parsed identifier.
362 * @param tree Parsed identifier name
363 * @param topLevel The toplevel to use
364 */
365 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
366 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
367 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
368 syms.errSymbol.name,
369 null, null, null, null);
370 localEnv.enclClass.sym = syms.errSymbol;
371 return tree.accept(identAttributer, localEnv);
372 }
373 // where
374 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
375 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
376 @Override
377 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
378 Symbol site = visit(node.getExpression(), env);
379 if (site.kind == ERR || site.kind == ABSENT_TYP)
380 return site;
381 Name name = (Name)node.getIdentifier();
382 if (site.kind == PCK) {
383 env.toplevel.packge = (PackageSymbol)site;
384 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
385 } else {
386 env.enclClass.sym = (ClassSymbol)site;
387 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
388 }
389 }
391 @Override
392 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
393 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
394 }
395 }
397 public Type coerce(Type etype, Type ttype) {
398 return cfolder.coerce(etype, ttype);
399 }
401 public Type attribType(JCTree node, TypeSymbol sym) {
402 Env<AttrContext> env = typeEnvs.get(sym);
403 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
404 return attribTree(node, localEnv, unknownTypeInfo);
405 }
407 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
408 // Attribute qualifying package or class.
409 JCFieldAccess s = (JCFieldAccess)tree.qualid;
410 return attribTree(s.selected,
411 env,
412 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
413 Type.noType));
414 }
416 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
417 breakTree = tree;
418 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
419 try {
420 attribExpr(expr, env);
421 } catch (BreakAttr b) {
422 return b.env;
423 } catch (AssertionError ae) {
424 if (ae.getCause() instanceof BreakAttr) {
425 return ((BreakAttr)(ae.getCause())).env;
426 } else {
427 throw ae;
428 }
429 } finally {
430 breakTree = null;
431 log.useSource(prev);
432 }
433 return env;
434 }
436 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
437 breakTree = tree;
438 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
439 try {
440 attribStat(stmt, env);
441 } catch (BreakAttr b) {
442 return b.env;
443 } catch (AssertionError ae) {
444 if (ae.getCause() instanceof BreakAttr) {
445 return ((BreakAttr)(ae.getCause())).env;
446 } else {
447 throw ae;
448 }
449 } finally {
450 breakTree = null;
451 log.useSource(prev);
452 }
453 return env;
454 }
456 private JCTree breakTree = null;
458 private static class BreakAttr extends RuntimeException {
459 static final long serialVersionUID = -6924771130405446405L;
460 private Env<AttrContext> env;
461 private BreakAttr(Env<AttrContext> env) {
462 this.env = env;
463 }
464 }
466 class ResultInfo {
467 final int pkind;
468 final Type pt;
469 final CheckContext checkContext;
471 ResultInfo(int pkind, Type pt) {
472 this(pkind, pt, chk.basicHandler);
473 }
475 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
476 this.pkind = pkind;
477 this.pt = pt;
478 this.checkContext = checkContext;
479 }
481 protected Type check(final DiagnosticPosition pos, final Type found) {
482 return chk.checkType(pos, found, pt, checkContext);
483 }
485 protected ResultInfo dup(Type newPt) {
486 return new ResultInfo(pkind, newPt, checkContext);
487 }
489 protected ResultInfo dup(CheckContext newContext) {
490 return new ResultInfo(pkind, pt, newContext);
491 }
493 protected ResultInfo dup(Type newPt, CheckContext newContext) {
494 return new ResultInfo(pkind, newPt, newContext);
495 }
497 @Override
498 public String toString() {
499 if (pt != null) {
500 return pt.toString();
501 } else {
502 return "";
503 }
504 }
505 }
507 class RecoveryInfo extends ResultInfo {
509 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
510 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
511 @Override
512 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
513 return deferredAttrContext;
514 }
515 @Override
516 public boolean compatible(Type found, Type req, Warner warn) {
517 return true;
518 }
519 @Override
520 public void report(DiagnosticPosition pos, JCDiagnostic details) {
521 chk.basicHandler.report(pos, details);
522 }
523 });
524 }
525 }
527 final ResultInfo statInfo;
528 final ResultInfo varInfo;
529 final ResultInfo unknownAnyPolyInfo;
530 final ResultInfo unknownExprInfo;
531 final ResultInfo unknownTypeInfo;
532 final ResultInfo unknownTypeExprInfo;
533 final ResultInfo recoveryInfo;
535 Type pt() {
536 return resultInfo.pt;
537 }
539 int pkind() {
540 return resultInfo.pkind;
541 }
543 /* ************************************************************************
544 * Visitor methods
545 *************************************************************************/
547 /** Visitor argument: the current environment.
548 */
549 Env<AttrContext> env;
551 /** Visitor argument: the currently expected attribution result.
552 */
553 ResultInfo resultInfo;
555 /** Visitor result: the computed type.
556 */
557 Type result;
559 /** Synthetic tree to be used during 'fake' checks.
560 */
561 JCTree noCheckTree;
563 /** Visitor method: attribute a tree, catching any completion failure
564 * exceptions. Return the tree's type.
565 *
566 * @param tree The tree to be visited.
567 * @param env The environment visitor argument.
568 * @param resultInfo The result info visitor argument.
569 */
570 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
571 Env<AttrContext> prevEnv = this.env;
572 ResultInfo prevResult = this.resultInfo;
573 try {
574 this.env = env;
575 this.resultInfo = resultInfo;
576 tree.accept(this);
577 if (tree == breakTree &&
578 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
579 throw new BreakAttr(copyEnv(env));
580 }
581 return result;
582 } catch (CompletionFailure ex) {
583 tree.type = syms.errType;
584 return chk.completionError(tree.pos(), ex);
585 } finally {
586 this.env = prevEnv;
587 this.resultInfo = prevResult;
588 }
589 }
591 Env<AttrContext> copyEnv(Env<AttrContext> env) {
592 Env<AttrContext> newEnv =
593 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
594 if (newEnv.outer != null) {
595 newEnv.outer = copyEnv(newEnv.outer);
596 }
597 return newEnv;
598 }
600 Scope copyScope(Scope sc) {
601 Scope newScope = new Scope(sc.owner);
602 List<Symbol> elemsList = List.nil();
603 while (sc != null) {
604 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
605 elemsList = elemsList.prepend(e.sym);
606 }
607 sc = sc.next;
608 }
609 for (Symbol s : elemsList) {
610 newScope.enter(s);
611 }
612 return newScope;
613 }
615 /** Derived visitor method: attribute an expression tree.
616 */
617 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
618 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
619 }
621 /** Derived visitor method: attribute an expression tree with
622 * no constraints on the computed type.
623 */
624 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
625 return attribTree(tree, env, unknownExprInfo);
626 }
628 /** Derived visitor method: attribute a type tree.
629 */
630 public Type attribType(JCTree tree, Env<AttrContext> env) {
631 Type result = attribType(tree, env, Type.noType);
632 return result;
633 }
635 /** Derived visitor method: attribute a type tree.
636 */
637 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
638 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
639 return result;
640 }
642 /** Derived visitor method: attribute a statement or definition tree.
643 */
644 public Type attribStat(JCTree tree, Env<AttrContext> env) {
645 return attribTree(tree, env, statInfo);
646 }
648 /** Attribute a list of expressions, returning a list of types.
649 */
650 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
651 ListBuffer<Type> ts = new ListBuffer<Type>();
652 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
653 ts.append(attribExpr(l.head, env, pt));
654 return ts.toList();
655 }
657 /** Attribute a list of statements, returning nothing.
658 */
659 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
660 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
661 attribStat(l.head, env);
662 }
664 /** Attribute the arguments in a method call, returning the method kind.
665 */
666 int attribArgs(int initialKind, List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
667 int kind = initialKind;
668 for (JCExpression arg : trees) {
669 Type argtype;
670 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
671 argtype = deferredAttr.new DeferredType(arg, env);
672 kind |= POLY;
673 } else {
674 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
675 }
676 argtypes.append(argtype);
677 }
678 return kind;
679 }
681 /** Attribute a type argument list, returning a list of types.
682 * Caller is responsible for calling checkRefTypes.
683 */
684 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
685 ListBuffer<Type> argtypes = new ListBuffer<Type>();
686 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
687 argtypes.append(attribType(l.head, env));
688 return argtypes.toList();
689 }
691 /** Attribute a type argument list, returning a list of types.
692 * Check that all the types are references.
693 */
694 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
695 List<Type> types = attribAnyTypes(trees, env);
696 return chk.checkRefTypes(trees, types);
697 }
699 /**
700 * Attribute type variables (of generic classes or methods).
701 * Compound types are attributed later in attribBounds.
702 * @param typarams the type variables to enter
703 * @param env the current environment
704 */
705 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
706 for (JCTypeParameter tvar : typarams) {
707 TypeVar a = (TypeVar)tvar.type;
708 a.tsym.flags_field |= UNATTRIBUTED;
709 a.bound = Type.noType;
710 if (!tvar.bounds.isEmpty()) {
711 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
712 for (JCExpression bound : tvar.bounds.tail)
713 bounds = bounds.prepend(attribType(bound, env));
714 types.setBounds(a, bounds.reverse());
715 } else {
716 // if no bounds are given, assume a single bound of
717 // java.lang.Object.
718 types.setBounds(a, List.of(syms.objectType));
719 }
720 a.tsym.flags_field &= ~UNATTRIBUTED;
721 }
722 for (JCTypeParameter tvar : typarams) {
723 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
724 }
725 }
727 /**
728 * Attribute the type references in a list of annotations.
729 */
730 void attribAnnotationTypes(List<JCAnnotation> annotations,
731 Env<AttrContext> env) {
732 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
733 JCAnnotation a = al.head;
734 attribType(a.annotationType, env);
735 }
736 }
738 /**
739 * Attribute a "lazy constant value".
740 * @param env The env for the const value
741 * @param initializer The initializer for the const value
742 * @param type The expected type, or null
743 * @see VarSymbol#setLazyConstValue
744 */
745 public Object attribLazyConstantValue(Env<AttrContext> env,
746 JCVariableDecl variable,
747 Type type) {
749 DiagnosticPosition prevLintPos
750 = deferredLintHandler.setPos(variable.pos());
752 try {
753 // Use null as symbol to not attach the type annotation to any symbol.
754 // The initializer will later also be visited and then we'll attach
755 // to the symbol.
756 // This prevents having multiple type annotations, just because of
757 // lazy constant value evaluation.
758 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
759 annotate.flush();
760 Type itype = attribExpr(variable.init, env, type);
761 if (itype.constValue() != null) {
762 return coerce(itype, type).constValue();
763 } else {
764 return null;
765 }
766 } finally {
767 deferredLintHandler.setPos(prevLintPos);
768 }
769 }
771 /** Attribute type reference in an `extends' or `implements' clause.
772 * Supertypes of anonymous inner classes are usually already attributed.
773 *
774 * @param tree The tree making up the type reference.
775 * @param env The environment current at the reference.
776 * @param classExpected true if only a class is expected here.
777 * @param interfaceExpected true if only an interface is expected here.
778 */
779 Type attribBase(JCTree tree,
780 Env<AttrContext> env,
781 boolean classExpected,
782 boolean interfaceExpected,
783 boolean checkExtensible) {
784 Type t = tree.type != null ?
785 tree.type :
786 attribType(tree, env);
787 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
788 }
789 Type checkBase(Type t,
790 JCTree tree,
791 Env<AttrContext> env,
792 boolean classExpected,
793 boolean interfaceExpected,
794 boolean checkExtensible) {
795 if (t.tsym.isAnonymous()) {
796 log.error(tree.pos(), "cant.inherit.from.anon");
797 return types.createErrorType(t);
798 }
799 if (t.isErroneous())
800 return t;
801 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
802 // check that type variable is already visible
803 if (t.getUpperBound() == null) {
804 log.error(tree.pos(), "illegal.forward.ref");
805 return types.createErrorType(t);
806 }
807 } else {
808 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
809 }
810 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
811 log.error(tree.pos(), "intf.expected.here");
812 // return errType is necessary since otherwise there might
813 // be undetected cycles which cause attribution to loop
814 return types.createErrorType(t);
815 } else if (checkExtensible &&
816 classExpected &&
817 (t.tsym.flags() & INTERFACE) != 0) {
818 log.error(tree.pos(), "no.intf.expected.here");
819 return types.createErrorType(t);
820 }
821 if (checkExtensible &&
822 ((t.tsym.flags() & FINAL) != 0)) {
823 log.error(tree.pos(),
824 "cant.inherit.from.final", t.tsym);
825 }
826 chk.checkNonCyclic(tree.pos(), t);
827 return t;
828 }
830 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
831 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
832 id.type = env.info.scope.owner.type;
833 id.sym = env.info.scope.owner;
834 return id.type;
835 }
837 public void visitClassDef(JCClassDecl tree) {
838 // Local and anonymous classes have not been entered yet, so we need to
839 // do it now.
840 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0) {
841 enter.classEnter(tree, env);
842 } else {
843 // If this class declaration is part of a class level annotation,
844 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
845 // order to simplify later steps and allow for sensible error
846 // messages.
847 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
848 enter.classEnter(tree, env);
849 }
851 ClassSymbol c = tree.sym;
852 if (c == null) {
853 // exit in case something drastic went wrong during enter.
854 result = null;
855 } else {
856 // make sure class has been completed:
857 c.complete();
859 // If this class appears as an anonymous class
860 // in a superclass constructor call where
861 // no explicit outer instance is given,
862 // disable implicit outer instance from being passed.
863 // (This would be an illegal access to "this before super").
864 if (env.info.isSelfCall &&
865 env.tree.hasTag(NEWCLASS) &&
866 ((JCNewClass) env.tree).encl == null)
867 {
868 c.flags_field |= NOOUTERTHIS;
869 }
870 attribClass(tree.pos(), c);
871 result = tree.type = c.type;
872 }
873 }
875 public void visitMethodDef(JCMethodDecl tree) {
876 MethodSymbol m = tree.sym;
877 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
879 Lint lint = env.info.lint.augment(m);
880 Lint prevLint = chk.setLint(lint);
881 MethodSymbol prevMethod = chk.setMethod(m);
882 try {
883 deferredLintHandler.flush(tree.pos());
884 chk.checkDeprecatedAnnotation(tree.pos(), m);
887 // Create a new environment with local scope
888 // for attributing the method.
889 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
890 localEnv.info.lint = lint;
892 attribStats(tree.typarams, localEnv);
894 // If we override any other methods, check that we do so properly.
895 // JLS ???
896 if (m.isStatic()) {
897 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
898 } else {
899 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
900 }
901 chk.checkOverride(tree, m);
903 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
904 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
905 }
907 // Enter all type parameters into the local method scope.
908 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
909 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
911 ClassSymbol owner = env.enclClass.sym;
912 if ((owner.flags() & ANNOTATION) != 0 &&
913 tree.params.nonEmpty())
914 log.error(tree.params.head.pos(),
915 "intf.annotation.members.cant.have.params");
917 // Attribute all value parameters.
918 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
919 attribStat(l.head, localEnv);
920 }
922 chk.checkVarargsMethodDecl(localEnv, tree);
924 // Check that type parameters are well-formed.
925 chk.validate(tree.typarams, localEnv);
927 // Check that result type is well-formed.
928 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
929 chk.validate(tree.restype, localEnv);
931 // Check that receiver type is well-formed.
932 if (tree.recvparam != null) {
933 // Use a new environment to check the receiver parameter.
934 // Otherwise I get "might not have been initialized" errors.
935 // Is there a better way?
936 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
937 attribType(tree.recvparam, newEnv);
938 chk.validate(tree.recvparam, newEnv);
939 }
941 // annotation method checks
942 if ((owner.flags() & ANNOTATION) != 0) {
943 // annotation method cannot have throws clause
944 if (tree.thrown.nonEmpty()) {
945 log.error(tree.thrown.head.pos(),
946 "throws.not.allowed.in.intf.annotation");
947 }
948 // annotation method cannot declare type-parameters
949 if (tree.typarams.nonEmpty()) {
950 log.error(tree.typarams.head.pos(),
951 "intf.annotation.members.cant.have.type.params");
952 }
953 // validate annotation method's return type (could be an annotation type)
954 chk.validateAnnotationType(tree.restype);
955 // ensure that annotation method does not clash with members of Object/Annotation
956 chk.validateAnnotationMethod(tree.pos(), m);
957 }
959 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
960 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
962 if (tree.body == null) {
963 // Empty bodies are only allowed for
964 // abstract, native, or interface methods, or for methods
965 // in a retrofit signature class.
966 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
967 !relax)
968 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
969 if (tree.defaultValue != null) {
970 if ((owner.flags() & ANNOTATION) == 0)
971 log.error(tree.pos(),
972 "default.allowed.in.intf.annotation.member");
973 }
974 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
975 if ((owner.flags() & INTERFACE) != 0) {
976 log.error(tree.body.pos(), "intf.meth.cant.have.body");
977 } else {
978 log.error(tree.pos(), "abstract.meth.cant.have.body");
979 }
980 } else if ((tree.mods.flags & NATIVE) != 0) {
981 log.error(tree.pos(), "native.meth.cant.have.body");
982 } else {
983 // Add an implicit super() call unless an explicit call to
984 // super(...) or this(...) is given
985 // or we are compiling class java.lang.Object.
986 if (tree.name == names.init && owner.type != syms.objectType) {
987 JCBlock body = tree.body;
988 if (body.stats.isEmpty() ||
989 !TreeInfo.isSelfCall(body.stats.head)) {
990 body.stats = body.stats.
991 prepend(memberEnter.SuperCall(make.at(body.pos),
992 List.<Type>nil(),
993 List.<JCVariableDecl>nil(),
994 false));
995 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
996 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
997 TreeInfo.isSuperCall(body.stats.head)) {
998 // enum constructors are not allowed to call super
999 // directly, so make sure there aren't any super calls
1000 // in enum constructors, except in the compiler
1001 // generated one.
1002 log.error(tree.body.stats.head.pos(),
1003 "call.to.super.not.allowed.in.enum.ctor",
1004 env.enclClass.sym);
1005 }
1006 }
1008 // Attribute all type annotations in the body
1009 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1010 annotate.flush();
1012 // Attribute method body.
1013 attribStat(tree.body, localEnv);
1014 }
1016 localEnv.info.scope.leave();
1017 result = tree.type = m.type;
1018 }
1019 finally {
1020 chk.setLint(prevLint);
1021 chk.setMethod(prevMethod);
1022 }
1023 }
1025 public void visitVarDef(JCVariableDecl tree) {
1026 // Local variables have not been entered yet, so we need to do it now:
1027 if (env.info.scope.owner.kind == MTH) {
1028 if (tree.sym != null) {
1029 // parameters have already been entered
1030 env.info.scope.enter(tree.sym);
1031 } else {
1032 try {
1033 annotate.enterStart();
1034 memberEnter.memberEnter(tree, env);
1035 } finally {
1036 annotate.enterDone();
1037 }
1038 }
1039 } else {
1040 if (tree.init != null) {
1041 // Field initializer expression need to be entered.
1042 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1043 annotate.flush();
1044 }
1045 }
1047 VarSymbol v = tree.sym;
1048 Lint lint = env.info.lint.augment(v);
1049 Lint prevLint = chk.setLint(lint);
1051 // Check that the variable's declared type is well-formed.
1052 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1053 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1054 (tree.sym.flags() & PARAMETER) != 0;
1055 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1057 try {
1058 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1059 deferredLintHandler.flush(tree.pos());
1060 chk.checkDeprecatedAnnotation(tree.pos(), v);
1062 if (tree.init != null) {
1063 if ((v.flags_field & FINAL) == 0 ||
1064 !memberEnter.needsLazyConstValue(tree.init)) {
1065 // Not a compile-time constant
1066 // Attribute initializer in a new environment
1067 // with the declared variable as owner.
1068 // Check that initializer conforms to variable's declared type.
1069 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1070 initEnv.info.lint = lint;
1071 // In order to catch self-references, we set the variable's
1072 // declaration position to maximal possible value, effectively
1073 // marking the variable as undefined.
1074 initEnv.info.enclVar = v;
1075 attribExpr(tree.init, initEnv, v.type);
1076 }
1077 }
1078 result = tree.type = v.type;
1079 }
1080 finally {
1081 chk.setLint(prevLint);
1082 }
1083 }
1085 public void visitSkip(JCSkip tree) {
1086 result = null;
1087 }
1089 public void visitBlock(JCBlock tree) {
1090 if (env.info.scope.owner.kind == TYP) {
1091 // Block is a static or instance initializer;
1092 // let the owner of the environment be a freshly
1093 // created BLOCK-method.
1094 Env<AttrContext> localEnv =
1095 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1096 localEnv.info.scope.owner =
1097 new MethodSymbol(tree.flags | BLOCK |
1098 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1099 env.info.scope.owner);
1100 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1102 // Attribute all type annotations in the block
1103 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1104 annotate.flush();
1106 {
1107 // Store init and clinit type annotations with the ClassSymbol
1108 // to allow output in Gen.normalizeDefs.
1109 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1110 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1111 if ((tree.flags & STATIC) != 0) {
1112 cs.appendClassInitTypeAttributes(tas);
1113 } else {
1114 cs.appendInitTypeAttributes(tas);
1115 }
1116 }
1118 attribStats(tree.stats, localEnv);
1119 } else {
1120 // Create a new local environment with a local scope.
1121 Env<AttrContext> localEnv =
1122 env.dup(tree, env.info.dup(env.info.scope.dup()));
1123 try {
1124 attribStats(tree.stats, localEnv);
1125 } finally {
1126 localEnv.info.scope.leave();
1127 }
1128 }
1129 result = null;
1130 }
1132 public void visitDoLoop(JCDoWhileLoop tree) {
1133 attribStat(tree.body, env.dup(tree));
1134 attribExpr(tree.cond, env, syms.booleanType);
1135 result = null;
1136 }
1138 public void visitWhileLoop(JCWhileLoop tree) {
1139 attribExpr(tree.cond, env, syms.booleanType);
1140 attribStat(tree.body, env.dup(tree));
1141 result = null;
1142 }
1144 public void visitForLoop(JCForLoop tree) {
1145 Env<AttrContext> loopEnv =
1146 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1147 try {
1148 attribStats(tree.init, loopEnv);
1149 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1150 loopEnv.tree = tree; // before, we were not in loop!
1151 attribStats(tree.step, loopEnv);
1152 attribStat(tree.body, loopEnv);
1153 result = null;
1154 }
1155 finally {
1156 loopEnv.info.scope.leave();
1157 }
1158 }
1160 public void visitForeachLoop(JCEnhancedForLoop tree) {
1161 Env<AttrContext> loopEnv =
1162 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1163 try {
1164 //the Formal Parameter of a for-each loop is not in the scope when
1165 //attributing the for-each expression; we mimick this by attributing
1166 //the for-each expression first (against original scope).
1167 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1168 attribStat(tree.var, loopEnv);
1169 chk.checkNonVoid(tree.pos(), exprType);
1170 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1171 if (elemtype == null) {
1172 // or perhaps expr implements Iterable<T>?
1173 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1174 if (base == null) {
1175 log.error(tree.expr.pos(),
1176 "foreach.not.applicable.to.type",
1177 exprType,
1178 diags.fragment("type.req.array.or.iterable"));
1179 elemtype = types.createErrorType(exprType);
1180 } else {
1181 List<Type> iterableParams = base.allparams();
1182 elemtype = iterableParams.isEmpty()
1183 ? syms.objectType
1184 : types.wildUpperBound(iterableParams.head);
1185 }
1186 }
1187 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1188 loopEnv.tree = tree; // before, we were not in loop!
1189 attribStat(tree.body, loopEnv);
1190 result = null;
1191 }
1192 finally {
1193 loopEnv.info.scope.leave();
1194 }
1195 }
1197 public void visitLabelled(JCLabeledStatement tree) {
1198 // Check that label is not used in an enclosing statement
1199 Env<AttrContext> env1 = env;
1200 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1201 if (env1.tree.hasTag(LABELLED) &&
1202 ((JCLabeledStatement) env1.tree).label == tree.label) {
1203 log.error(tree.pos(), "label.already.in.use",
1204 tree.label);
1205 break;
1206 }
1207 env1 = env1.next;
1208 }
1210 attribStat(tree.body, env.dup(tree));
1211 result = null;
1212 }
1214 public void visitSwitch(JCSwitch tree) {
1215 Type seltype = attribExpr(tree.selector, env);
1217 Env<AttrContext> switchEnv =
1218 env.dup(tree, env.info.dup(env.info.scope.dup()));
1220 try {
1222 boolean enumSwitch =
1223 allowEnums &&
1224 (seltype.tsym.flags() & Flags.ENUM) != 0;
1225 boolean stringSwitch = false;
1226 if (types.isSameType(seltype, syms.stringType)) {
1227 if (allowStringsInSwitch) {
1228 stringSwitch = true;
1229 } else {
1230 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1231 }
1232 }
1233 if (!enumSwitch && !stringSwitch)
1234 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1236 // Attribute all cases and
1237 // check that there are no duplicate case labels or default clauses.
1238 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1239 boolean hasDefault = false; // Is there a default label?
1240 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1241 JCCase c = l.head;
1242 Env<AttrContext> caseEnv =
1243 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1244 try {
1245 if (c.pat != null) {
1246 if (enumSwitch) {
1247 Symbol sym = enumConstant(c.pat, seltype);
1248 if (sym == null) {
1249 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1250 } else if (!labels.add(sym)) {
1251 log.error(c.pos(), "duplicate.case.label");
1252 }
1253 } else {
1254 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1255 if (!pattype.hasTag(ERROR)) {
1256 if (pattype.constValue() == null) {
1257 log.error(c.pat.pos(),
1258 (stringSwitch ? "string.const.req" : "const.expr.req"));
1259 } else if (labels.contains(pattype.constValue())) {
1260 log.error(c.pos(), "duplicate.case.label");
1261 } else {
1262 labels.add(pattype.constValue());
1263 }
1264 }
1265 }
1266 } else if (hasDefault) {
1267 log.error(c.pos(), "duplicate.default.label");
1268 } else {
1269 hasDefault = true;
1270 }
1271 attribStats(c.stats, caseEnv);
1272 } finally {
1273 caseEnv.info.scope.leave();
1274 addVars(c.stats, switchEnv.info.scope);
1275 }
1276 }
1278 result = null;
1279 }
1280 finally {
1281 switchEnv.info.scope.leave();
1282 }
1283 }
1284 // where
1285 /** Add any variables defined in stats to the switch scope. */
1286 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1287 for (;stats.nonEmpty(); stats = stats.tail) {
1288 JCTree stat = stats.head;
1289 if (stat.hasTag(VARDEF))
1290 switchScope.enter(((JCVariableDecl) stat).sym);
1291 }
1292 }
1293 // where
1294 /** Return the selected enumeration constant symbol, or null. */
1295 private Symbol enumConstant(JCTree tree, Type enumType) {
1296 if (!tree.hasTag(IDENT)) {
1297 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1298 return syms.errSymbol;
1299 }
1300 JCIdent ident = (JCIdent)tree;
1301 Name name = ident.name;
1302 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1303 e.scope != null; e = e.next()) {
1304 if (e.sym.kind == VAR) {
1305 Symbol s = ident.sym = e.sym;
1306 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1307 ident.type = s.type;
1308 return ((s.flags_field & Flags.ENUM) == 0)
1309 ? null : s;
1310 }
1311 }
1312 return null;
1313 }
1315 public void visitSynchronized(JCSynchronized tree) {
1316 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1317 attribStat(tree.body, env);
1318 result = null;
1319 }
1321 public void visitTry(JCTry tree) {
1322 // Create a new local environment with a local
1323 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1324 try {
1325 boolean isTryWithResource = tree.resources.nonEmpty();
1326 // Create a nested environment for attributing the try block if needed
1327 Env<AttrContext> tryEnv = isTryWithResource ?
1328 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1329 localEnv;
1330 try {
1331 // Attribute resource declarations
1332 for (JCTree resource : tree.resources) {
1333 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1334 @Override
1335 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1336 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1337 }
1338 };
1339 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1340 if (resource.hasTag(VARDEF)) {
1341 attribStat(resource, tryEnv);
1342 twrResult.check(resource, resource.type);
1344 //check that resource type cannot throw InterruptedException
1345 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1347 VarSymbol var = ((JCVariableDecl) resource).sym;
1348 var.setData(ElementKind.RESOURCE_VARIABLE);
1349 } else {
1350 attribTree(resource, tryEnv, twrResult);
1351 }
1352 }
1353 // Attribute body
1354 attribStat(tree.body, tryEnv);
1355 } finally {
1356 if (isTryWithResource)
1357 tryEnv.info.scope.leave();
1358 }
1360 // Attribute catch clauses
1361 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1362 JCCatch c = l.head;
1363 Env<AttrContext> catchEnv =
1364 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1365 try {
1366 Type ctype = attribStat(c.param, catchEnv);
1367 if (TreeInfo.isMultiCatch(c)) {
1368 //multi-catch parameter is implicitly marked as final
1369 c.param.sym.flags_field |= FINAL | UNION;
1370 }
1371 if (c.param.sym.kind == Kinds.VAR) {
1372 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1373 }
1374 chk.checkType(c.param.vartype.pos(),
1375 chk.checkClassType(c.param.vartype.pos(), ctype),
1376 syms.throwableType);
1377 attribStat(c.body, catchEnv);
1378 } finally {
1379 catchEnv.info.scope.leave();
1380 }
1381 }
1383 // Attribute finalizer
1384 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1385 result = null;
1386 }
1387 finally {
1388 localEnv.info.scope.leave();
1389 }
1390 }
1392 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1393 if (!resource.isErroneous() &&
1394 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1395 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1396 Symbol close = syms.noSymbol;
1397 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1398 try {
1399 close = rs.resolveQualifiedMethod(pos,
1400 env,
1401 resource,
1402 names.close,
1403 List.<Type>nil(),
1404 List.<Type>nil());
1405 }
1406 finally {
1407 log.popDiagnosticHandler(discardHandler);
1408 }
1409 if (close.kind == MTH &&
1410 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1411 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1412 env.info.lint.isEnabled(LintCategory.TRY)) {
1413 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1414 }
1415 }
1416 }
1418 public void visitConditional(JCConditional tree) {
1419 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1421 tree.polyKind = (!allowPoly ||
1422 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1423 isBooleanOrNumeric(env, tree)) ?
1424 PolyKind.STANDALONE : PolyKind.POLY;
1426 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1427 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1428 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1429 result = tree.type = types.createErrorType(resultInfo.pt);
1430 return;
1431 }
1433 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1434 unknownExprInfo :
1435 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1436 //this will use enclosing check context to check compatibility of
1437 //subexpression against target type; if we are in a method check context,
1438 //depending on whether boxing is allowed, we could have incompatibilities
1439 @Override
1440 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1441 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1442 }
1443 });
1445 Type truetype = attribTree(tree.truepart, env, condInfo);
1446 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1448 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1449 if (condtype.constValue() != null &&
1450 truetype.constValue() != null &&
1451 falsetype.constValue() != null &&
1452 !owntype.hasTag(NONE)) {
1453 //constant folding
1454 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1455 }
1456 result = check(tree, owntype, VAL, resultInfo);
1457 }
1458 //where
1459 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1460 switch (tree.getTag()) {
1461 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1462 ((JCLiteral)tree).typetag == BOOLEAN ||
1463 ((JCLiteral)tree).typetag == BOT;
1464 case LAMBDA: case REFERENCE: return false;
1465 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1466 case CONDEXPR:
1467 JCConditional condTree = (JCConditional)tree;
1468 return isBooleanOrNumeric(env, condTree.truepart) &&
1469 isBooleanOrNumeric(env, condTree.falsepart);
1470 case APPLY:
1471 JCMethodInvocation speculativeMethodTree =
1472 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1473 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1474 return types.unboxedTypeOrType(owntype).isPrimitive();
1475 case NEWCLASS:
1476 JCExpression className =
1477 removeClassParams.translate(((JCNewClass)tree).clazz);
1478 JCExpression speculativeNewClassTree =
1479 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1480 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1481 default:
1482 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1483 speculativeType = types.unboxedTypeOrType(speculativeType);
1484 return speculativeType.isPrimitive();
1485 }
1486 }
1487 //where
1488 TreeTranslator removeClassParams = new TreeTranslator() {
1489 @Override
1490 public void visitTypeApply(JCTypeApply tree) {
1491 result = translate(tree.clazz);
1492 }
1493 };
1495 /** Compute the type of a conditional expression, after
1496 * checking that it exists. See JLS 15.25. Does not take into
1497 * account the special case where condition and both arms
1498 * are constants.
1499 *
1500 * @param pos The source position to be used for error
1501 * diagnostics.
1502 * @param thentype The type of the expression's then-part.
1503 * @param elsetype The type of the expression's else-part.
1504 */
1505 private Type condType(DiagnosticPosition pos,
1506 Type thentype, Type elsetype) {
1507 // If same type, that is the result
1508 if (types.isSameType(thentype, elsetype))
1509 return thentype.baseType();
1511 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1512 ? thentype : types.unboxedType(thentype);
1513 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1514 ? elsetype : types.unboxedType(elsetype);
1516 // Otherwise, if both arms can be converted to a numeric
1517 // type, return the least numeric type that fits both arms
1518 // (i.e. return larger of the two, or return int if one
1519 // arm is short, the other is char).
1520 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1521 // If one arm has an integer subrange type (i.e., byte,
1522 // short, or char), and the other is an integer constant
1523 // that fits into the subrange, return the subrange type.
1524 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1525 elseUnboxed.hasTag(INT) &&
1526 types.isAssignable(elseUnboxed, thenUnboxed)) {
1527 return thenUnboxed.baseType();
1528 }
1529 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1530 thenUnboxed.hasTag(INT) &&
1531 types.isAssignable(thenUnboxed, elseUnboxed)) {
1532 return elseUnboxed.baseType();
1533 }
1535 for (TypeTag tag : primitiveTags) {
1536 Type candidate = syms.typeOfTag[tag.ordinal()];
1537 if (types.isSubtype(thenUnboxed, candidate) &&
1538 types.isSubtype(elseUnboxed, candidate)) {
1539 return candidate;
1540 }
1541 }
1542 }
1544 // Those were all the cases that could result in a primitive
1545 if (allowBoxing) {
1546 if (thentype.isPrimitive())
1547 thentype = types.boxedClass(thentype).type;
1548 if (elsetype.isPrimitive())
1549 elsetype = types.boxedClass(elsetype).type;
1550 }
1552 if (types.isSubtype(thentype, elsetype))
1553 return elsetype.baseType();
1554 if (types.isSubtype(elsetype, thentype))
1555 return thentype.baseType();
1557 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1558 log.error(pos, "neither.conditional.subtype",
1559 thentype, elsetype);
1560 return thentype.baseType();
1561 }
1563 // both are known to be reference types. The result is
1564 // lub(thentype,elsetype). This cannot fail, as it will
1565 // always be possible to infer "Object" if nothing better.
1566 return types.lub(thentype.baseType(), elsetype.baseType());
1567 }
1569 final static TypeTag[] primitiveTags = new TypeTag[]{
1570 BYTE,
1571 CHAR,
1572 SHORT,
1573 INT,
1574 LONG,
1575 FLOAT,
1576 DOUBLE,
1577 BOOLEAN,
1578 };
1580 public void visitIf(JCIf tree) {
1581 attribExpr(tree.cond, env, syms.booleanType);
1582 attribStat(tree.thenpart, env);
1583 if (tree.elsepart != null)
1584 attribStat(tree.elsepart, env);
1585 chk.checkEmptyIf(tree);
1586 result = null;
1587 }
1589 public void visitExec(JCExpressionStatement tree) {
1590 //a fresh environment is required for 292 inference to work properly ---
1591 //see Infer.instantiatePolymorphicSignatureInstance()
1592 Env<AttrContext> localEnv = env.dup(tree);
1593 attribExpr(tree.expr, localEnv);
1594 result = null;
1595 }
1597 public void visitBreak(JCBreak tree) {
1598 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1599 result = null;
1600 }
1602 public void visitContinue(JCContinue tree) {
1603 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1604 result = null;
1605 }
1606 //where
1607 /** Return the target of a break or continue statement, if it exists,
1608 * report an error if not.
1609 * Note: The target of a labelled break or continue is the
1610 * (non-labelled) statement tree referred to by the label,
1611 * not the tree representing the labelled statement itself.
1612 *
1613 * @param pos The position to be used for error diagnostics
1614 * @param tag The tag of the jump statement. This is either
1615 * Tree.BREAK or Tree.CONTINUE.
1616 * @param label The label of the jump statement, or null if no
1617 * label is given.
1618 * @param env The environment current at the jump statement.
1619 */
1620 private JCTree findJumpTarget(DiagnosticPosition pos,
1621 JCTree.Tag tag,
1622 Name label,
1623 Env<AttrContext> env) {
1624 // Search environments outwards from the point of jump.
1625 Env<AttrContext> env1 = env;
1626 LOOP:
1627 while (env1 != null) {
1628 switch (env1.tree.getTag()) {
1629 case LABELLED:
1630 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1631 if (label == labelled.label) {
1632 // If jump is a continue, check that target is a loop.
1633 if (tag == CONTINUE) {
1634 if (!labelled.body.hasTag(DOLOOP) &&
1635 !labelled.body.hasTag(WHILELOOP) &&
1636 !labelled.body.hasTag(FORLOOP) &&
1637 !labelled.body.hasTag(FOREACHLOOP))
1638 log.error(pos, "not.loop.label", label);
1639 // Found labelled statement target, now go inwards
1640 // to next non-labelled tree.
1641 return TreeInfo.referencedStatement(labelled);
1642 } else {
1643 return labelled;
1644 }
1645 }
1646 break;
1647 case DOLOOP:
1648 case WHILELOOP:
1649 case FORLOOP:
1650 case FOREACHLOOP:
1651 if (label == null) return env1.tree;
1652 break;
1653 case SWITCH:
1654 if (label == null && tag == BREAK) return env1.tree;
1655 break;
1656 case LAMBDA:
1657 case METHODDEF:
1658 case CLASSDEF:
1659 break LOOP;
1660 default:
1661 }
1662 env1 = env1.next;
1663 }
1664 if (label != null)
1665 log.error(pos, "undef.label", label);
1666 else if (tag == CONTINUE)
1667 log.error(pos, "cont.outside.loop");
1668 else
1669 log.error(pos, "break.outside.switch.loop");
1670 return null;
1671 }
1673 public void visitReturn(JCReturn tree) {
1674 // Check that there is an enclosing method which is
1675 // nested within than the enclosing class.
1676 if (env.info.returnResult == null) {
1677 log.error(tree.pos(), "ret.outside.meth");
1678 } else {
1679 // Attribute return expression, if it exists, and check that
1680 // it conforms to result type of enclosing method.
1681 if (tree.expr != null) {
1682 if (env.info.returnResult.pt.hasTag(VOID)) {
1683 env.info.returnResult.checkContext.report(tree.expr.pos(),
1684 diags.fragment("unexpected.ret.val"));
1685 }
1686 attribTree(tree.expr, env, env.info.returnResult);
1687 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1688 !env.info.returnResult.pt.hasTag(NONE)) {
1689 env.info.returnResult.checkContext.report(tree.pos(),
1690 diags.fragment("missing.ret.val"));
1691 }
1692 }
1693 result = null;
1694 }
1696 public void visitThrow(JCThrow tree) {
1697 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1698 if (allowPoly) {
1699 chk.checkType(tree, owntype, syms.throwableType);
1700 }
1701 result = null;
1702 }
1704 public void visitAssert(JCAssert tree) {
1705 attribExpr(tree.cond, env, syms.booleanType);
1706 if (tree.detail != null) {
1707 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1708 }
1709 result = null;
1710 }
1712 /** Visitor method for method invocations.
1713 * NOTE: The method part of an application will have in its type field
1714 * the return type of the method, not the method's type itself!
1715 */
1716 public void visitApply(JCMethodInvocation tree) {
1717 // The local environment of a method application is
1718 // a new environment nested in the current one.
1719 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1721 // The types of the actual method arguments.
1722 List<Type> argtypes;
1724 // The types of the actual method type arguments.
1725 List<Type> typeargtypes = null;
1727 Name methName = TreeInfo.name(tree.meth);
1729 boolean isConstructorCall =
1730 methName == names._this || methName == names._super;
1732 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1733 if (isConstructorCall) {
1734 // We are seeing a ...this(...) or ...super(...) call.
1735 // Check that this is the first statement in a constructor.
1736 if (checkFirstConstructorStat(tree, env)) {
1738 // Record the fact
1739 // that this is a constructor call (using isSelfCall).
1740 localEnv.info.isSelfCall = true;
1742 // Attribute arguments, yielding list of argument types.
1743 int kind = attribArgs(MTH, tree.args, localEnv, argtypesBuf);
1744 argtypes = argtypesBuf.toList();
1745 typeargtypes = attribTypes(tree.typeargs, localEnv);
1747 // Variable `site' points to the class in which the called
1748 // constructor is defined.
1749 Type site = env.enclClass.sym.type;
1750 if (methName == names._super) {
1751 if (site == syms.objectType) {
1752 log.error(tree.meth.pos(), "no.superclass", site);
1753 site = types.createErrorType(syms.objectType);
1754 } else {
1755 site = types.supertype(site);
1756 }
1757 }
1759 if (site.hasTag(CLASS)) {
1760 Type encl = site.getEnclosingType();
1761 while (encl != null && encl.hasTag(TYPEVAR))
1762 encl = encl.getUpperBound();
1763 if (encl.hasTag(CLASS)) {
1764 // we are calling a nested class
1766 if (tree.meth.hasTag(SELECT)) {
1767 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1769 // We are seeing a prefixed call, of the form
1770 // <expr>.super(...).
1771 // Check that the prefix expression conforms
1772 // to the outer instance type of the class.
1773 chk.checkRefType(qualifier.pos(),
1774 attribExpr(qualifier, localEnv,
1775 encl));
1776 } else if (methName == names._super) {
1777 // qualifier omitted; check for existence
1778 // of an appropriate implicit qualifier.
1779 rs.resolveImplicitThis(tree.meth.pos(),
1780 localEnv, site, true);
1781 }
1782 } else if (tree.meth.hasTag(SELECT)) {
1783 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1784 site.tsym);
1785 }
1787 // if we're calling a java.lang.Enum constructor,
1788 // prefix the implicit String and int parameters
1789 if (site.tsym == syms.enumSym && allowEnums)
1790 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1792 // Resolve the called constructor under the assumption
1793 // that we are referring to a superclass instance of the
1794 // current instance (JLS ???).
1795 boolean selectSuperPrev = localEnv.info.selectSuper;
1796 localEnv.info.selectSuper = true;
1797 localEnv.info.pendingResolutionPhase = null;
1798 Symbol sym = rs.resolveConstructor(
1799 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1800 localEnv.info.selectSuper = selectSuperPrev;
1802 // Set method symbol to resolved constructor...
1803 TreeInfo.setSymbol(tree.meth, sym);
1805 // ...and check that it is legal in the current context.
1806 // (this will also set the tree's type)
1807 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1808 checkId(tree.meth, site, sym, localEnv, new ResultInfo(kind, mpt));
1809 }
1810 // Otherwise, `site' is an error type and we do nothing
1811 }
1812 result = tree.type = syms.voidType;
1813 } else {
1814 // Otherwise, we are seeing a regular method call.
1815 // Attribute the arguments, yielding list of argument types, ...
1816 int kind = attribArgs(VAL, tree.args, localEnv, argtypesBuf);
1817 argtypes = argtypesBuf.toList();
1818 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1820 // ... and attribute the method using as a prototype a methodtype
1821 // whose formal argument types is exactly the list of actual
1822 // arguments (this will also set the method symbol).
1823 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1824 localEnv.info.pendingResolutionPhase = null;
1825 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1827 // Compute the result type.
1828 Type restype = mtype.getReturnType();
1829 if (restype.hasTag(WILDCARD))
1830 throw new AssertionError(mtype);
1832 Type qualifier = (tree.meth.hasTag(SELECT))
1833 ? ((JCFieldAccess) tree.meth).selected.type
1834 : env.enclClass.sym.type;
1835 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1837 chk.checkRefTypes(tree.typeargs, typeargtypes);
1839 // Check that value of resulting type is admissible in the
1840 // current context. Also, capture the return type
1841 result = check(tree, capture(restype), VAL, resultInfo);
1842 }
1843 chk.validate(tree.typeargs, localEnv);
1844 }
1845 //where
1846 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1847 if (allowCovariantReturns &&
1848 methodName == names.clone &&
1849 types.isArray(qualifierType)) {
1850 // as a special case, array.clone() has a result that is
1851 // the same as static type of the array being cloned
1852 return qualifierType;
1853 } else if (allowGenerics &&
1854 methodName == names.getClass &&
1855 argtypes.isEmpty()) {
1856 // as a special case, x.getClass() has type Class<? extends |X|>
1857 return new ClassType(restype.getEnclosingType(),
1858 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1859 BoundKind.EXTENDS,
1860 syms.boundClass)),
1861 restype.tsym);
1862 } else {
1863 return restype;
1864 }
1865 }
1867 /** Check that given application node appears as first statement
1868 * in a constructor call.
1869 * @param tree The application node
1870 * @param env The environment current at the application.
1871 */
1872 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1873 JCMethodDecl enclMethod = env.enclMethod;
1874 if (enclMethod != null && enclMethod.name == names.init) {
1875 JCBlock body = enclMethod.body;
1876 if (body.stats.head.hasTag(EXEC) &&
1877 ((JCExpressionStatement) body.stats.head).expr == tree)
1878 return true;
1879 }
1880 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1881 TreeInfo.name(tree.meth));
1882 return false;
1883 }
1885 /** Obtain a method type with given argument types.
1886 */
1887 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1888 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1889 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1890 }
1892 public void visitNewClass(final JCNewClass tree) {
1893 Type owntype = types.createErrorType(tree.type);
1895 // The local environment of a class creation is
1896 // a new environment nested in the current one.
1897 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1899 // The anonymous inner class definition of the new expression,
1900 // if one is defined by it.
1901 JCClassDecl cdef = tree.def;
1903 // If enclosing class is given, attribute it, and
1904 // complete class name to be fully qualified
1905 JCExpression clazz = tree.clazz; // Class field following new
1906 JCExpression clazzid; // Identifier in class field
1907 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1908 annoclazzid = null;
1910 if (clazz.hasTag(TYPEAPPLY)) {
1911 clazzid = ((JCTypeApply) clazz).clazz;
1912 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1913 annoclazzid = (JCAnnotatedType) clazzid;
1914 clazzid = annoclazzid.underlyingType;
1915 }
1916 } else {
1917 if (clazz.hasTag(ANNOTATED_TYPE)) {
1918 annoclazzid = (JCAnnotatedType) clazz;
1919 clazzid = annoclazzid.underlyingType;
1920 } else {
1921 clazzid = clazz;
1922 }
1923 }
1925 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1927 if (tree.encl != null) {
1928 // We are seeing a qualified new, of the form
1929 // <expr>.new C <...> (...) ...
1930 // In this case, we let clazz stand for the name of the
1931 // allocated class C prefixed with the type of the qualifier
1932 // expression, so that we can
1933 // resolve it with standard techniques later. I.e., if
1934 // <expr> has type T, then <expr>.new C <...> (...)
1935 // yields a clazz T.C.
1936 Type encltype = chk.checkRefType(tree.encl.pos(),
1937 attribExpr(tree.encl, env));
1938 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1939 // from expr to the combined type, or not? Yes, do this.
1940 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1941 ((JCIdent) clazzid).name);
1943 EndPosTable endPosTable = this.env.toplevel.endPositions;
1944 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1945 if (clazz.hasTag(ANNOTATED_TYPE)) {
1946 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1947 List<JCAnnotation> annos = annoType.annotations;
1949 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1950 clazzid1 = make.at(tree.pos).
1951 TypeApply(clazzid1,
1952 ((JCTypeApply) clazz).arguments);
1953 }
1955 clazzid1 = make.at(tree.pos).
1956 AnnotatedType(annos, clazzid1);
1957 } else if (clazz.hasTag(TYPEAPPLY)) {
1958 clazzid1 = make.at(tree.pos).
1959 TypeApply(clazzid1,
1960 ((JCTypeApply) clazz).arguments);
1961 }
1963 clazz = clazzid1;
1964 }
1966 // Attribute clazz expression and store
1967 // symbol + type back into the attributed tree.
1968 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1969 attribIdentAsEnumType(env, (JCIdent)clazz) :
1970 attribType(clazz, env);
1972 clazztype = chk.checkDiamond(tree, clazztype);
1973 chk.validate(clazz, localEnv);
1974 if (tree.encl != null) {
1975 // We have to work in this case to store
1976 // symbol + type back into the attributed tree.
1977 tree.clazz.type = clazztype;
1978 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1979 clazzid.type = ((JCIdent) clazzid).sym.type;
1980 if (annoclazzid != null) {
1981 annoclazzid.type = clazzid.type;
1982 }
1983 if (!clazztype.isErroneous()) {
1984 if (cdef != null && clazztype.tsym.isInterface()) {
1985 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1986 } else if (clazztype.tsym.isStatic()) {
1987 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1988 }
1989 }
1990 } else if (!clazztype.tsym.isInterface() &&
1991 clazztype.getEnclosingType().hasTag(CLASS)) {
1992 // Check for the existence of an apropos outer instance
1993 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1994 }
1996 // Attribute constructor arguments.
1997 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1998 int pkind = attribArgs(VAL, tree.args, localEnv, argtypesBuf);
1999 List<Type> argtypes = argtypesBuf.toList();
2000 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2002 // If we have made no mistakes in the class type...
2003 if (clazztype.hasTag(CLASS)) {
2004 // Enums may not be instantiated except implicitly
2005 if (allowEnums &&
2006 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2007 (!env.tree.hasTag(VARDEF) ||
2008 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2009 ((JCVariableDecl) env.tree).init != tree))
2010 log.error(tree.pos(), "enum.cant.be.instantiated");
2011 // Check that class is not abstract
2012 if (cdef == null &&
2013 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2014 log.error(tree.pos(), "abstract.cant.be.instantiated",
2015 clazztype.tsym);
2016 } else if (cdef != null && clazztype.tsym.isInterface()) {
2017 // Check that no constructor arguments are given to
2018 // anonymous classes implementing an interface
2019 if (!argtypes.isEmpty())
2020 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2022 if (!typeargtypes.isEmpty())
2023 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2025 // Error recovery: pretend no arguments were supplied.
2026 argtypes = List.nil();
2027 typeargtypes = List.nil();
2028 } else if (TreeInfo.isDiamond(tree)) {
2029 ClassType site = new ClassType(clazztype.getEnclosingType(),
2030 clazztype.tsym.type.getTypeArguments(),
2031 clazztype.tsym);
2033 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2034 diamondEnv.info.selectSuper = cdef != null;
2035 diamondEnv.info.pendingResolutionPhase = null;
2037 //if the type of the instance creation expression is a class type
2038 //apply method resolution inference (JLS 15.12.2.7). The return type
2039 //of the resolved constructor will be a partially instantiated type
2040 Symbol constructor = rs.resolveDiamond(tree.pos(),
2041 diamondEnv,
2042 site,
2043 argtypes,
2044 typeargtypes);
2045 tree.constructor = constructor.baseSymbol();
2047 final TypeSymbol csym = clazztype.tsym;
2048 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2049 @Override
2050 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2051 enclosingContext.report(tree.clazz,
2052 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2053 }
2054 });
2055 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2056 constructorType = checkId(noCheckTree, site,
2057 constructor,
2058 diamondEnv,
2059 diamondResult);
2061 tree.clazz.type = types.createErrorType(clazztype);
2062 if (!constructorType.isErroneous()) {
2063 tree.clazz.type = clazztype = constructorType.getReturnType();
2064 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2065 }
2066 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2067 }
2069 // Resolve the called constructor under the assumption
2070 // that we are referring to a superclass instance of the
2071 // current instance (JLS ???).
2072 else {
2073 //the following code alters some of the fields in the current
2074 //AttrContext - hence, the current context must be dup'ed in
2075 //order to avoid downstream failures
2076 Env<AttrContext> rsEnv = localEnv.dup(tree);
2077 rsEnv.info.selectSuper = cdef != null;
2078 rsEnv.info.pendingResolutionPhase = null;
2079 tree.constructor = rs.resolveConstructor(
2080 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2081 if (cdef == null) { //do not check twice!
2082 tree.constructorType = checkId(noCheckTree,
2083 clazztype,
2084 tree.constructor,
2085 rsEnv,
2086 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2087 if (rsEnv.info.lastResolveVarargs())
2088 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2089 }
2090 if (cdef == null &&
2091 !clazztype.isErroneous() &&
2092 clazztype.getTypeArguments().nonEmpty() &&
2093 findDiamonds) {
2094 findDiamond(localEnv, tree, clazztype);
2095 }
2096 }
2098 if (cdef != null) {
2099 // We are seeing an anonymous class instance creation.
2100 // In this case, the class instance creation
2101 // expression
2102 //
2103 // E.new <typeargs1>C<typargs2>(args) { ... }
2104 //
2105 // is represented internally as
2106 //
2107 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2108 //
2109 // This expression is then *transformed* as follows:
2110 //
2111 // (1) add a STATIC flag to the class definition
2112 // if the current environment is static
2113 // (2) add an extends or implements clause
2114 // (3) add a constructor.
2115 //
2116 // For instance, if C is a class, and ET is the type of E,
2117 // the expression
2118 //
2119 // E.new <typeargs1>C<typargs2>(args) { ... }
2120 //
2121 // is translated to (where X is a fresh name and typarams is the
2122 // parameter list of the super constructor):
2123 //
2124 // new <typeargs1>X(<*nullchk*>E, args) where
2125 // X extends C<typargs2> {
2126 // <typarams> X(ET e, args) {
2127 // e.<typeargs1>super(args)
2128 // }
2129 // ...
2130 // }
2131 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2133 if (clazztype.tsym.isInterface()) {
2134 cdef.implementing = List.of(clazz);
2135 } else {
2136 cdef.extending = clazz;
2137 }
2139 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2140 isSerializable(clazztype)) {
2141 localEnv.info.isSerializable = true;
2142 }
2144 attribStat(cdef, localEnv);
2146 checkLambdaCandidate(tree, cdef.sym, clazztype);
2148 // If an outer instance is given,
2149 // prefix it to the constructor arguments
2150 // and delete it from the new expression
2151 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2152 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2153 argtypes = argtypes.prepend(tree.encl.type);
2154 tree.encl = null;
2155 }
2157 // Reassign clazztype and recompute constructor.
2158 clazztype = cdef.sym.type;
2159 Symbol sym = tree.constructor = rs.resolveConstructor(
2160 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2161 Assert.check(sym.kind < AMBIGUOUS);
2162 tree.constructor = sym;
2163 tree.constructorType = checkId(noCheckTree,
2164 clazztype,
2165 tree.constructor,
2166 localEnv,
2167 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2168 }
2170 if (tree.constructor != null && tree.constructor.kind == MTH)
2171 owntype = clazztype;
2172 }
2173 result = check(tree, owntype, VAL, resultInfo);
2174 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
2175 if (tree.constructorType != null && inferenceContext.free(tree.constructorType)) {
2176 //we need to wait for inference to finish and then replace inference vars in the constructor type
2177 inferenceContext.addFreeTypeListener(List.of(tree.constructorType),
2178 new FreeTypeListener() {
2179 @Override
2180 public void typesInferred(InferenceContext instantiatedContext) {
2181 tree.constructorType = instantiatedContext.asInstType(tree.constructorType);
2182 }
2183 });
2184 }
2185 chk.validate(tree.typeargs, localEnv);
2186 }
2187 //where
2188 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2189 JCTypeApply ta = (JCTypeApply)tree.clazz;
2190 List<JCExpression> prevTypeargs = ta.arguments;
2191 try {
2192 //create a 'fake' diamond AST node by removing type-argument trees
2193 ta.arguments = List.nil();
2194 ResultInfo findDiamondResult = new ResultInfo(VAL,
2195 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2196 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2197 Type polyPt = allowPoly ?
2198 syms.objectType :
2199 clazztype;
2200 if (!inferred.isErroneous() &&
2201 (allowPoly && pt() == Infer.anyPoly ?
2202 types.isSameType(inferred, clazztype) :
2203 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2204 String key = types.isSameType(clazztype, inferred) ?
2205 "diamond.redundant.args" :
2206 "diamond.redundant.args.1";
2207 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2208 }
2209 } finally {
2210 ta.arguments = prevTypeargs;
2211 }
2212 }
2214 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2215 if (allowLambda &&
2216 identifyLambdaCandidate &&
2217 clazztype.hasTag(CLASS) &&
2218 !pt().hasTag(NONE) &&
2219 types.isFunctionalInterface(clazztype.tsym)) {
2220 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2221 int count = 0;
2222 boolean found = false;
2223 for (Symbol sym : csym.members().getElements()) {
2224 if ((sym.flags() & SYNTHETIC) != 0 ||
2225 sym.isConstructor()) continue;
2226 count++;
2227 if (sym.kind != MTH ||
2228 !sym.name.equals(descriptor.name)) continue;
2229 Type mtype = types.memberType(clazztype, sym);
2230 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2231 found = true;
2232 }
2233 }
2234 if (found && count == 1) {
2235 log.note(tree.def, "potential.lambda.found");
2236 }
2237 }
2238 }
2240 /** Make an attributed null check tree.
2241 */
2242 public JCExpression makeNullCheck(JCExpression arg) {
2243 // optimization: X.this is never null; skip null check
2244 Name name = TreeInfo.name(arg);
2245 if (name == names._this || name == names._super) return arg;
2247 JCTree.Tag optag = NULLCHK;
2248 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2249 tree.operator = syms.nullcheck;
2250 tree.type = arg.type;
2251 return tree;
2252 }
2254 public void visitNewArray(JCNewArray tree) {
2255 Type owntype = types.createErrorType(tree.type);
2256 Env<AttrContext> localEnv = env.dup(tree);
2257 Type elemtype;
2258 if (tree.elemtype != null) {
2259 elemtype = attribType(tree.elemtype, localEnv);
2260 chk.validate(tree.elemtype, localEnv);
2261 owntype = elemtype;
2262 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2263 attribExpr(l.head, localEnv, syms.intType);
2264 owntype = new ArrayType(owntype, syms.arrayClass);
2265 }
2266 } else {
2267 // we are seeing an untyped aggregate { ... }
2268 // this is allowed only if the prototype is an array
2269 if (pt().hasTag(ARRAY)) {
2270 elemtype = types.elemtype(pt());
2271 } else {
2272 if (!pt().hasTag(ERROR)) {
2273 log.error(tree.pos(), "illegal.initializer.for.type",
2274 pt());
2275 }
2276 elemtype = types.createErrorType(pt());
2277 }
2278 }
2279 if (tree.elems != null) {
2280 attribExprs(tree.elems, localEnv, elemtype);
2281 owntype = new ArrayType(elemtype, syms.arrayClass);
2282 }
2283 if (!types.isReifiable(elemtype))
2284 log.error(tree.pos(), "generic.array.creation");
2285 result = check(tree, owntype, VAL, resultInfo);
2286 }
2288 /*
2289 * A lambda expression can only be attributed when a target-type is available.
2290 * In addition, if the target-type is that of a functional interface whose
2291 * descriptor contains inference variables in argument position the lambda expression
2292 * is 'stuck' (see DeferredAttr).
2293 */
2294 @Override
2295 public void visitLambda(final JCLambda that) {
2296 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2297 if (pt().hasTag(NONE)) {
2298 //lambda only allowed in assignment or method invocation/cast context
2299 log.error(that.pos(), "unexpected.lambda");
2300 }
2301 result = that.type = types.createErrorType(pt());
2302 return;
2303 }
2304 //create an environment for attribution of the lambda expression
2305 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2306 boolean needsRecovery =
2307 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2308 try {
2309 Type currentTarget = pt();
2310 if (needsRecovery && isSerializable(currentTarget)) {
2311 localEnv.info.isSerializable = true;
2312 }
2313 List<Type> explicitParamTypes = null;
2314 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2315 //attribute lambda parameters
2316 attribStats(that.params, localEnv);
2317 explicitParamTypes = TreeInfo.types(that.params);
2318 }
2320 Type lambdaType;
2321 if (pt() != Type.recoveryType) {
2322 /* We need to adjust the target. If the target is an
2323 * intersection type, for example: SAM & I1 & I2 ...
2324 * the target will be updated to SAM
2325 */
2326 currentTarget = targetChecker.visit(currentTarget, that);
2327 if (explicitParamTypes != null) {
2328 currentTarget = infer.instantiateFunctionalInterface(that,
2329 currentTarget, explicitParamTypes, resultInfo.checkContext);
2330 }
2331 currentTarget = types.removeWildcards(currentTarget);
2332 lambdaType = types.findDescriptorType(currentTarget);
2333 } else {
2334 currentTarget = Type.recoveryType;
2335 lambdaType = fallbackDescriptorType(that);
2336 }
2338 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2340 if (lambdaType.hasTag(FORALL)) {
2341 //lambda expression target desc cannot be a generic method
2342 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2343 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2344 result = that.type = types.createErrorType(pt());
2345 return;
2346 }
2348 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2349 //add param type info in the AST
2350 List<Type> actuals = lambdaType.getParameterTypes();
2351 List<JCVariableDecl> params = that.params;
2353 boolean arityMismatch = false;
2355 while (params.nonEmpty()) {
2356 if (actuals.isEmpty()) {
2357 //not enough actuals to perform lambda parameter inference
2358 arityMismatch = true;
2359 }
2360 //reset previously set info
2361 Type argType = arityMismatch ?
2362 syms.errType :
2363 actuals.head;
2364 params.head.vartype = make.at(params.head).Type(argType);
2365 params.head.sym = null;
2366 actuals = actuals.isEmpty() ?
2367 actuals :
2368 actuals.tail;
2369 params = params.tail;
2370 }
2372 //attribute lambda parameters
2373 attribStats(that.params, localEnv);
2375 if (arityMismatch) {
2376 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2377 result = that.type = types.createErrorType(currentTarget);
2378 return;
2379 }
2380 }
2382 //from this point on, no recovery is needed; if we are in assignment context
2383 //we will be able to attribute the whole lambda body, regardless of errors;
2384 //if we are in a 'check' method context, and the lambda is not compatible
2385 //with the target-type, it will be recovered anyway in Attr.checkId
2386 needsRecovery = false;
2388 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2389 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2390 new FunctionalReturnContext(resultInfo.checkContext);
2392 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2393 recoveryInfo :
2394 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2395 localEnv.info.returnResult = bodyResultInfo;
2397 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2398 attribTree(that.getBody(), localEnv, bodyResultInfo);
2399 } else {
2400 JCBlock body = (JCBlock)that.body;
2401 attribStats(body.stats, localEnv);
2402 }
2404 result = check(that, currentTarget, VAL, resultInfo);
2406 boolean isSpeculativeRound =
2407 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2409 preFlow(that);
2410 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2412 that.type = currentTarget; //avoids recovery at this stage
2413 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2415 if (!isSpeculativeRound) {
2416 //add thrown types as bounds to the thrown types free variables if needed:
2417 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2418 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2419 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes());
2421 chk.unhandled(inferredThrownTypes, thrownTypes);
2422 }
2424 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2425 }
2426 result = check(that, currentTarget, VAL, resultInfo);
2427 } catch (Types.FunctionDescriptorLookupError ex) {
2428 JCDiagnostic cause = ex.getDiagnostic();
2429 resultInfo.checkContext.report(that, cause);
2430 result = that.type = types.createErrorType(pt());
2431 return;
2432 } finally {
2433 localEnv.info.scope.leave();
2434 if (needsRecovery) {
2435 attribTree(that, env, recoveryInfo);
2436 }
2437 }
2438 }
2439 //where
2440 void preFlow(JCLambda tree) {
2441 new PostAttrAnalyzer() {
2442 @Override
2443 public void scan(JCTree tree) {
2444 if (tree == null ||
2445 (tree.type != null &&
2446 tree.type == Type.stuckType)) {
2447 //don't touch stuck expressions!
2448 return;
2449 }
2450 super.scan(tree);
2451 }
2452 }.scan(tree);
2453 }
2455 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2457 @Override
2458 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2459 return t.isIntersection() ?
2460 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2461 }
2463 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2464 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2465 Type target = null;
2466 for (Type bound : ict.getExplicitComponents()) {
2467 TypeSymbol boundSym = bound.tsym;
2468 if (types.isFunctionalInterface(boundSym) &&
2469 types.findDescriptorSymbol(boundSym) == desc) {
2470 target = bound;
2471 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2472 //bound must be an interface
2473 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2474 }
2475 }
2476 return target != null ?
2477 target :
2478 ict.getExplicitComponents().head; //error recovery
2479 }
2481 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2482 ListBuffer<Type> targs = new ListBuffer<>();
2483 ListBuffer<Type> supertypes = new ListBuffer<>();
2484 for (Type i : ict.interfaces_field) {
2485 if (i.isParameterized()) {
2486 targs.appendList(i.tsym.type.allparams());
2487 }
2488 supertypes.append(i.tsym.type);
2489 }
2490 IntersectionClassType notionalIntf = types.makeIntersectionType(supertypes.toList());
2491 notionalIntf.allparams_field = targs.toList();
2492 notionalIntf.tsym.flags_field |= INTERFACE;
2493 return notionalIntf.tsym;
2494 }
2496 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2497 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2498 diags.fragment(key, args)));
2499 }
2500 };
2502 private Type fallbackDescriptorType(JCExpression tree) {
2503 switch (tree.getTag()) {
2504 case LAMBDA:
2505 JCLambda lambda = (JCLambda)tree;
2506 List<Type> argtypes = List.nil();
2507 for (JCVariableDecl param : lambda.params) {
2508 argtypes = param.vartype != null ?
2509 argtypes.append(param.vartype.type) :
2510 argtypes.append(syms.errType);
2511 }
2512 return new MethodType(argtypes, Type.recoveryType,
2513 List.of(syms.throwableType), syms.methodClass);
2514 case REFERENCE:
2515 return new MethodType(List.<Type>nil(), Type.recoveryType,
2516 List.of(syms.throwableType), syms.methodClass);
2517 default:
2518 Assert.error("Cannot get here!");
2519 }
2520 return null;
2521 }
2523 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2524 final InferenceContext inferenceContext, final Type... ts) {
2525 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2526 }
2528 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2529 final InferenceContext inferenceContext, final List<Type> ts) {
2530 if (inferenceContext.free(ts)) {
2531 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2532 @Override
2533 public void typesInferred(InferenceContext inferenceContext) {
2534 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2535 }
2536 });
2537 } else {
2538 for (Type t : ts) {
2539 rs.checkAccessibleType(env, t);
2540 }
2541 }
2542 }
2544 /**
2545 * Lambda/method reference have a special check context that ensures
2546 * that i.e. a lambda return type is compatible with the expected
2547 * type according to both the inherited context and the assignment
2548 * context.
2549 */
2550 class FunctionalReturnContext extends Check.NestedCheckContext {
2552 FunctionalReturnContext(CheckContext enclosingContext) {
2553 super(enclosingContext);
2554 }
2556 @Override
2557 public boolean compatible(Type found, Type req, Warner warn) {
2558 //return type must be compatible in both current context and assignment context
2559 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn);
2560 }
2562 @Override
2563 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2564 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2565 }
2566 }
2568 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2570 JCExpression expr;
2572 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2573 super(enclosingContext);
2574 this.expr = expr;
2575 }
2577 @Override
2578 public boolean compatible(Type found, Type req, Warner warn) {
2579 //a void return is compatible with an expression statement lambda
2580 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2581 super.compatible(found, req, warn);
2582 }
2583 }
2585 /**
2586 * Lambda compatibility. Check that given return types, thrown types, parameter types
2587 * are compatible with the expected functional interface descriptor. This means that:
2588 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2589 * types must be compatible with the return type of the expected descriptor.
2590 */
2591 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2592 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2594 //return values have already been checked - but if lambda has no return
2595 //values, we must ensure that void/value compatibility is correct;
2596 //this amounts at checking that, if a lambda body can complete normally,
2597 //the descriptor's return type must be void
2598 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2599 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2600 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2601 diags.fragment("missing.ret.val", returnType)));
2602 }
2604 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2605 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2606 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2607 }
2608 }
2610 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2611 * static field and that lambda has type annotations, these annotations will
2612 * also be stored at these fake clinit methods.
2613 *
2614 * LambdaToMethod also use fake clinit methods so they can be reused.
2615 * Also as LTM is a phase subsequent to attribution, the methods from
2616 * clinits can be safely removed by LTM to save memory.
2617 */
2618 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2620 public MethodSymbol removeClinit(ClassSymbol sym) {
2621 return clinits.remove(sym);
2622 }
2624 /* This method returns an environment to be used to attribute a lambda
2625 * expression.
2626 *
2627 * The owner of this environment is a method symbol. If the current owner
2628 * is not a method, for example if the lambda is used to initialize
2629 * a field, then if the field is:
2630 *
2631 * - an instance field, we use the first constructor.
2632 * - a static field, we create a fake clinit method.
2633 */
2634 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2635 Env<AttrContext> lambdaEnv;
2636 Symbol owner = env.info.scope.owner;
2637 if (owner.kind == VAR && owner.owner.kind == TYP) {
2638 //field initializer
2639 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2640 ClassSymbol enclClass = owner.enclClass();
2641 /* if the field isn't static, then we can get the first constructor
2642 * and use it as the owner of the environment. This is what
2643 * LTM code is doing to look for type annotations so we are fine.
2644 */
2645 if ((owner.flags() & STATIC) == 0) {
2646 for (Symbol s : enclClass.members_field.getElementsByName(names.init)) {
2647 lambdaEnv.info.scope.owner = s;
2648 break;
2649 }
2650 } else {
2651 /* if the field is static then we need to create a fake clinit
2652 * method, this method can later be reused by LTM.
2653 */
2654 MethodSymbol clinit = clinits.get(enclClass);
2655 if (clinit == null) {
2656 Type clinitType = new MethodType(List.<Type>nil(),
2657 syms.voidType, List.<Type>nil(), syms.methodClass);
2658 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2659 names.clinit, clinitType, enclClass);
2660 clinit.params = List.<VarSymbol>nil();
2661 clinits.put(enclClass, clinit);
2662 }
2663 lambdaEnv.info.scope.owner = clinit;
2664 }
2665 } else {
2666 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2667 }
2668 return lambdaEnv;
2669 }
2671 @Override
2672 public void visitReference(final JCMemberReference that) {
2673 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2674 if (pt().hasTag(NONE)) {
2675 //method reference only allowed in assignment or method invocation/cast context
2676 log.error(that.pos(), "unexpected.mref");
2677 }
2678 result = that.type = types.createErrorType(pt());
2679 return;
2680 }
2681 final Env<AttrContext> localEnv = env.dup(that);
2682 try {
2683 //attribute member reference qualifier - if this is a constructor
2684 //reference, the expected kind must be a type
2685 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2687 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2688 exprType = chk.checkConstructorRefType(that.expr, exprType);
2689 if (!exprType.isErroneous() &&
2690 exprType.isRaw() &&
2691 that.typeargs != null) {
2692 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2693 diags.fragment("mref.infer.and.explicit.params"));
2694 exprType = types.createErrorType(exprType);
2695 }
2696 }
2698 if (exprType.isErroneous()) {
2699 //if the qualifier expression contains problems,
2700 //give up attribution of method reference
2701 result = that.type = exprType;
2702 return;
2703 }
2705 if (TreeInfo.isStaticSelector(that.expr, names)) {
2706 //if the qualifier is a type, validate it; raw warning check is
2707 //omitted as we don't know at this stage as to whether this is a
2708 //raw selector (because of inference)
2709 chk.validate(that.expr, env, false);
2710 }
2712 //attrib type-arguments
2713 List<Type> typeargtypes = List.nil();
2714 if (that.typeargs != null) {
2715 typeargtypes = attribTypes(that.typeargs, localEnv);
2716 }
2718 Type desc;
2719 Type currentTarget = pt();
2720 boolean isTargetSerializable =
2721 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2722 isSerializable(currentTarget);
2723 if (currentTarget != Type.recoveryType) {
2724 currentTarget = types.removeWildcards(targetChecker.visit(currentTarget, that));
2725 desc = types.findDescriptorType(currentTarget);
2726 } else {
2727 currentTarget = Type.recoveryType;
2728 desc = fallbackDescriptorType(that);
2729 }
2731 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
2732 List<Type> argtypes = desc.getParameterTypes();
2733 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2735 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2736 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2737 }
2739 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2740 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2741 try {
2742 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
2743 that.name, argtypes, typeargtypes, referenceCheck,
2744 resultInfo.checkContext.inferenceContext(),
2745 resultInfo.checkContext.deferredAttrContext().mode);
2746 } finally {
2747 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2748 }
2750 Symbol refSym = refResult.fst;
2751 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2753 if (refSym.kind != MTH) {
2754 boolean targetError;
2755 switch (refSym.kind) {
2756 case ABSENT_MTH:
2757 targetError = false;
2758 break;
2759 case WRONG_MTH:
2760 case WRONG_MTHS:
2761 case AMBIGUOUS:
2762 case HIDDEN:
2763 case STATICERR:
2764 case MISSING_ENCL:
2765 case WRONG_STATICNESS:
2766 targetError = true;
2767 break;
2768 default:
2769 Assert.error("unexpected result kind " + refSym.kind);
2770 targetError = false;
2771 }
2773 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2774 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2776 JCDiagnostic.DiagnosticType diagKind = targetError ?
2777 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2779 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2780 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2782 if (targetError && currentTarget == Type.recoveryType) {
2783 //a target error doesn't make sense during recovery stage
2784 //as we don't know what actual parameter types are
2785 result = that.type = currentTarget;
2786 return;
2787 } else {
2788 if (targetError) {
2789 resultInfo.checkContext.report(that, diag);
2790 } else {
2791 log.report(diag);
2792 }
2793 result = that.type = types.createErrorType(currentTarget);
2794 return;
2795 }
2796 }
2798 that.sym = refSym.baseSymbol();
2799 that.kind = lookupHelper.referenceKind(that.sym);
2800 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2802 if (desc.getReturnType() == Type.recoveryType) {
2803 // stop here
2804 result = that.type = currentTarget;
2805 return;
2806 }
2808 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2810 if (that.getMode() == ReferenceMode.INVOKE &&
2811 TreeInfo.isStaticSelector(that.expr, names) &&
2812 that.kind.isUnbound() &&
2813 !desc.getParameterTypes().head.isParameterized()) {
2814 chk.checkRaw(that.expr, localEnv);
2815 }
2817 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2818 exprType.getTypeArguments().nonEmpty()) {
2819 //static ref with class type-args
2820 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2821 diags.fragment("static.mref.with.targs"));
2822 result = that.type = types.createErrorType(currentTarget);
2823 return;
2824 }
2826 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2827 !that.kind.isUnbound()) {
2828 //no static bound mrefs
2829 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2830 diags.fragment("static.bound.mref"));
2831 result = that.type = types.createErrorType(currentTarget);
2832 return;
2833 }
2835 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2836 // Check that super-qualified symbols are not abstract (JLS)
2837 rs.checkNonAbstract(that.pos(), that.sym);
2838 }
2840 if (isTargetSerializable) {
2841 chk.checkElemAccessFromSerializableLambda(that);
2842 }
2843 }
2845 ResultInfo checkInfo =
2846 resultInfo.dup(newMethodTemplate(
2847 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2848 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
2849 new FunctionalReturnContext(resultInfo.checkContext));
2851 Type refType = checkId(noCheckTree, lookupHelper.site, refSym, localEnv, checkInfo);
2853 if (that.kind.isUnbound() &&
2854 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2855 //re-generate inference constraints for unbound receiver
2856 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
2857 //cannot happen as this has already been checked - we just need
2858 //to regenerate the inference constraints, as that has been lost
2859 //as a result of the call to inferenceContext.save()
2860 Assert.error("Can't get here");
2861 }
2862 }
2864 if (!refType.isErroneous()) {
2865 refType = types.createMethodTypeWithReturn(refType,
2866 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2867 }
2869 //go ahead with standard method reference compatibility check - note that param check
2870 //is a no-op (as this has been taken care during method applicability)
2871 boolean isSpeculativeRound =
2872 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2874 that.type = currentTarget; //avoids recovery at this stage
2875 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2876 if (!isSpeculativeRound) {
2877 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
2878 }
2879 result = check(that, currentTarget, VAL, resultInfo);
2880 } catch (Types.FunctionDescriptorLookupError ex) {
2881 JCDiagnostic cause = ex.getDiagnostic();
2882 resultInfo.checkContext.report(that, cause);
2883 result = that.type = types.createErrorType(pt());
2884 return;
2885 }
2886 }
2887 //where
2888 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2889 //if this is a constructor reference, the expected kind must be a type
2890 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2891 }
2894 @SuppressWarnings("fallthrough")
2895 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2896 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2898 Type resType;
2899 switch (tree.getMode()) {
2900 case NEW:
2901 if (!tree.expr.type.isRaw()) {
2902 resType = tree.expr.type;
2903 break;
2904 }
2905 default:
2906 resType = refType.getReturnType();
2907 }
2909 Type incompatibleReturnType = resType;
2911 if (returnType.hasTag(VOID)) {
2912 incompatibleReturnType = null;
2913 }
2915 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2916 if (resType.isErroneous() ||
2917 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2918 incompatibleReturnType = null;
2919 }
2920 }
2922 if (incompatibleReturnType != null) {
2923 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2924 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2925 }
2927 if (!speculativeAttr) {
2928 List<Type> thrownTypes = checkContext.inferenceContext().asUndetVars(descriptor.getThrownTypes());
2929 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2930 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2931 }
2932 }
2933 }
2935 /**
2936 * Set functional type info on the underlying AST. Note: as the target descriptor
2937 * might contain inference variables, we might need to register an hook in the
2938 * current inference context.
2939 */
2940 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2941 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2942 if (checkContext.inferenceContext().free(descriptorType)) {
2943 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2944 public void typesInferred(InferenceContext inferenceContext) {
2945 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2946 inferenceContext.asInstType(primaryTarget), checkContext);
2947 }
2948 });
2949 } else {
2950 ListBuffer<Type> targets = new ListBuffer<>();
2951 if (pt.hasTag(CLASS)) {
2952 if (pt.isCompound()) {
2953 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2954 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2955 if (t != primaryTarget) {
2956 targets.append(types.removeWildcards(t));
2957 }
2958 }
2959 } else {
2960 targets.append(types.removeWildcards(primaryTarget));
2961 }
2962 }
2963 fExpr.targets = targets.toList();
2964 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2965 pt != Type.recoveryType) {
2966 //check that functional interface class is well-formed
2967 try {
2968 /* Types.makeFunctionalInterfaceClass() may throw an exception
2969 * when it's executed post-inference. See the listener code
2970 * above.
2971 */
2972 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2973 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2974 if (csym != null) {
2975 chk.checkImplementations(env.tree, csym, csym);
2976 }
2977 } catch (Types.FunctionDescriptorLookupError ex) {
2978 JCDiagnostic cause = ex.getDiagnostic();
2979 resultInfo.checkContext.report(env.tree, cause);
2980 }
2981 }
2982 }
2983 }
2985 public void visitParens(JCParens tree) {
2986 Type owntype = attribTree(tree.expr, env, resultInfo);
2987 result = check(tree, owntype, pkind(), resultInfo);
2988 Symbol sym = TreeInfo.symbol(tree);
2989 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2990 log.error(tree.pos(), "illegal.start.of.type");
2991 }
2993 public void visitAssign(JCAssign tree) {
2994 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2995 Type capturedType = capture(owntype);
2996 attribExpr(tree.rhs, env, owntype);
2997 result = check(tree, capturedType, VAL, resultInfo);
2998 }
3000 public void visitAssignop(JCAssignOp tree) {
3001 // Attribute arguments.
3002 Type owntype = attribTree(tree.lhs, env, varInfo);
3003 Type operand = attribExpr(tree.rhs, env);
3004 // Find operator.
3005 Symbol operator = tree.operator = rs.resolveBinaryOperator(
3006 tree.pos(), tree.getTag().noAssignOp(), env,
3007 owntype, operand);
3009 if (operator.kind == MTH &&
3010 !owntype.isErroneous() &&
3011 !operand.isErroneous()) {
3012 chk.checkOperator(tree.pos(),
3013 (OperatorSymbol)operator,
3014 tree.getTag().noAssignOp(),
3015 owntype,
3016 operand);
3017 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3018 chk.checkCastable(tree.rhs.pos(),
3019 operator.type.getReturnType(),
3020 owntype);
3021 }
3022 result = check(tree, owntype, VAL, resultInfo);
3023 }
3025 public void visitUnary(JCUnary tree) {
3026 // Attribute arguments.
3027 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3028 ? attribTree(tree.arg, env, varInfo)
3029 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3031 // Find operator.
3032 Symbol operator = tree.operator =
3033 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
3035 Type owntype = types.createErrorType(tree.type);
3036 if (operator.kind == MTH &&
3037 !argtype.isErroneous()) {
3038 owntype = (tree.getTag().isIncOrDecUnaryOp())
3039 ? tree.arg.type
3040 : operator.type.getReturnType();
3041 int opc = ((OperatorSymbol)operator).opcode;
3043 // If the argument is constant, fold it.
3044 if (argtype.constValue() != null) {
3045 Type ctype = cfolder.fold1(opc, argtype);
3046 if (ctype != null) {
3047 owntype = cfolder.coerce(ctype, owntype);
3048 }
3049 }
3050 }
3051 result = check(tree, owntype, VAL, resultInfo);
3052 }
3054 public void visitBinary(JCBinary tree) {
3055 // Attribute arguments.
3056 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3057 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3059 // Find operator.
3060 Symbol operator = tree.operator =
3061 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3063 Type owntype = types.createErrorType(tree.type);
3064 if (operator.kind == MTH &&
3065 !left.isErroneous() &&
3066 !right.isErroneous()) {
3067 owntype = operator.type.getReturnType();
3068 // This will figure out when unboxing can happen and
3069 // choose the right comparison operator.
3070 int opc = chk.checkOperator(tree.lhs.pos(),
3071 (OperatorSymbol)operator,
3072 tree.getTag(),
3073 left,
3074 right);
3076 // If both arguments are constants, fold them.
3077 if (left.constValue() != null && right.constValue() != null) {
3078 Type ctype = cfolder.fold2(opc, left, right);
3079 if (ctype != null) {
3080 owntype = cfolder.coerce(ctype, owntype);
3081 }
3082 }
3084 // Check that argument types of a reference ==, != are
3085 // castable to each other, (JLS 15.21). Note: unboxing
3086 // comparisons will not have an acmp* opc at this point.
3087 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3088 if (!types.isEqualityComparable(left, right,
3089 new Warner(tree.pos()))) {
3090 log.error(tree.pos(), "incomparable.types", left, right);
3091 }
3092 }
3094 chk.checkDivZero(tree.rhs.pos(), operator, right);
3095 }
3096 result = check(tree, owntype, VAL, resultInfo);
3097 }
3099 public void visitTypeCast(final JCTypeCast tree) {
3100 Type clazztype = attribType(tree.clazz, env);
3101 chk.validate(tree.clazz, env, false);
3102 //a fresh environment is required for 292 inference to work properly ---
3103 //see Infer.instantiatePolymorphicSignatureInstance()
3104 Env<AttrContext> localEnv = env.dup(tree);
3105 //should we propagate the target type?
3106 final ResultInfo castInfo;
3107 JCExpression expr = TreeInfo.skipParens(tree.expr);
3108 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3109 if (isPoly) {
3110 //expression is a poly - we need to propagate target type info
3111 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3112 @Override
3113 public boolean compatible(Type found, Type req, Warner warn) {
3114 return types.isCastable(found, req, warn);
3115 }
3116 });
3117 } else {
3118 //standalone cast - target-type info is not propagated
3119 castInfo = unknownExprInfo;
3120 }
3121 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3122 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3123 if (exprtype.constValue() != null)
3124 owntype = cfolder.coerce(exprtype, owntype);
3125 result = check(tree, capture(owntype), VAL, resultInfo);
3126 if (!isPoly)
3127 chk.checkRedundantCast(localEnv, tree);
3128 }
3130 public void visitTypeTest(JCInstanceOf tree) {
3131 Type exprtype = chk.checkNullOrRefType(
3132 tree.expr.pos(), attribExpr(tree.expr, env));
3133 Type clazztype = attribType(tree.clazz, env);
3134 if (!clazztype.hasTag(TYPEVAR)) {
3135 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3136 }
3137 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3138 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3139 clazztype = types.createErrorType(clazztype);
3140 }
3141 chk.validate(tree.clazz, env, false);
3142 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3143 result = check(tree, syms.booleanType, VAL, resultInfo);
3144 }
3146 public void visitIndexed(JCArrayAccess tree) {
3147 Type owntype = types.createErrorType(tree.type);
3148 Type atype = attribExpr(tree.indexed, env);
3149 attribExpr(tree.index, env, syms.intType);
3150 if (types.isArray(atype))
3151 owntype = types.elemtype(atype);
3152 else if (!atype.hasTag(ERROR))
3153 log.error(tree.pos(), "array.req.but.found", atype);
3154 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3155 result = check(tree, owntype, VAR, resultInfo);
3156 }
3158 public void visitIdent(JCIdent tree) {
3159 Symbol sym;
3161 // Find symbol
3162 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3163 // If we are looking for a method, the prototype `pt' will be a
3164 // method type with the type of the call's arguments as parameters.
3165 env.info.pendingResolutionPhase = null;
3166 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3167 } else if (tree.sym != null && tree.sym.kind != VAR) {
3168 sym = tree.sym;
3169 } else {
3170 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3171 }
3172 tree.sym = sym;
3174 // (1) Also find the environment current for the class where
3175 // sym is defined (`symEnv').
3176 // Only for pre-tiger versions (1.4 and earlier):
3177 // (2) Also determine whether we access symbol out of an anonymous
3178 // class in a this or super call. This is illegal for instance
3179 // members since such classes don't carry a this$n link.
3180 // (`noOuterThisPath').
3181 Env<AttrContext> symEnv = env;
3182 boolean noOuterThisPath = false;
3183 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3184 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3185 sym.owner.kind == TYP &&
3186 tree.name != names._this && tree.name != names._super) {
3188 // Find environment in which identifier is defined.
3189 while (symEnv.outer != null &&
3190 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3191 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3192 noOuterThisPath = !allowAnonOuterThis;
3193 symEnv = symEnv.outer;
3194 }
3195 }
3197 // If symbol is a variable, ...
3198 if (sym.kind == VAR) {
3199 VarSymbol v = (VarSymbol)sym;
3201 // ..., evaluate its initializer, if it has one, and check for
3202 // illegal forward reference.
3203 checkInit(tree, env, v, false);
3205 // If we are expecting a variable (as opposed to a value), check
3206 // that the variable is assignable in the current environment.
3207 if (pkind() == VAR)
3208 checkAssignable(tree.pos(), v, null, env);
3209 }
3211 // In a constructor body,
3212 // if symbol is a field or instance method, check that it is
3213 // not accessed before the supertype constructor is called.
3214 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3215 (sym.kind & (VAR | MTH)) != 0 &&
3216 sym.owner.kind == TYP &&
3217 (sym.flags() & STATIC) == 0) {
3218 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3219 }
3220 Env<AttrContext> env1 = env;
3221 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3222 // If the found symbol is inaccessible, then it is
3223 // accessed through an enclosing instance. Locate this
3224 // enclosing instance:
3225 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3226 env1 = env1.outer;
3227 }
3229 if (env.info.isSerializable) {
3230 chk.checkElemAccessFromSerializableLambda(tree);
3231 }
3233 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3234 }
3236 public void visitSelect(JCFieldAccess tree) {
3237 // Determine the expected kind of the qualifier expression.
3238 int skind = 0;
3239 if (tree.name == names._this || tree.name == names._super ||
3240 tree.name == names._class)
3241 {
3242 skind = TYP;
3243 } else {
3244 if ((pkind() & PCK) != 0) skind = skind | PCK;
3245 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3246 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3247 }
3249 // Attribute the qualifier expression, and determine its symbol (if any).
3250 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3251 if ((pkind() & (PCK | TYP)) == 0)
3252 site = capture(site); // Capture field access
3254 // don't allow T.class T[].class, etc
3255 if (skind == TYP) {
3256 Type elt = site;
3257 while (elt.hasTag(ARRAY))
3258 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3259 if (elt.hasTag(TYPEVAR)) {
3260 log.error(tree.pos(), "type.var.cant.be.deref");
3261 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
3262 tree.sym = tree.type.tsym;
3263 return ;
3264 }
3265 }
3267 // If qualifier symbol is a type or `super', assert `selectSuper'
3268 // for the selection. This is relevant for determining whether
3269 // protected symbols are accessible.
3270 Symbol sitesym = TreeInfo.symbol(tree.selected);
3271 boolean selectSuperPrev = env.info.selectSuper;
3272 env.info.selectSuper =
3273 sitesym != null &&
3274 sitesym.name == names._super;
3276 // Determine the symbol represented by the selection.
3277 env.info.pendingResolutionPhase = null;
3278 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3279 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
3280 log.error(tree.selected.pos(), "not.encl.class", site.tsym);
3281 sym = syms.errSymbol;
3282 }
3283 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3284 site = capture(site);
3285 sym = selectSym(tree, sitesym, site, env, resultInfo);
3286 }
3287 boolean varArgs = env.info.lastResolveVarargs();
3288 tree.sym = sym;
3290 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3291 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3292 site = capture(site);
3293 }
3295 // If that symbol is a variable, ...
3296 if (sym.kind == VAR) {
3297 VarSymbol v = (VarSymbol)sym;
3299 // ..., evaluate its initializer, if it has one, and check for
3300 // illegal forward reference.
3301 checkInit(tree, env, v, true);
3303 // If we are expecting a variable (as opposed to a value), check
3304 // that the variable is assignable in the current environment.
3305 if (pkind() == VAR)
3306 checkAssignable(tree.pos(), v, tree.selected, env);
3307 }
3309 if (sitesym != null &&
3310 sitesym.kind == VAR &&
3311 ((VarSymbol)sitesym).isResourceVariable() &&
3312 sym.kind == MTH &&
3313 sym.name.equals(names.close) &&
3314 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3315 env.info.lint.isEnabled(LintCategory.TRY)) {
3316 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3317 }
3319 // Disallow selecting a type from an expression
3320 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3321 tree.type = check(tree.selected, pt(),
3322 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3323 }
3325 if (isType(sitesym)) {
3326 if (sym.name == names._this) {
3327 // If `C' is the currently compiled class, check that
3328 // C.this' does not appear in a call to a super(...)
3329 if (env.info.isSelfCall &&
3330 site.tsym == env.enclClass.sym) {
3331 chk.earlyRefError(tree.pos(), sym);
3332 }
3333 } else {
3334 // Check if type-qualified fields or methods are static (JLS)
3335 if ((sym.flags() & STATIC) == 0 &&
3336 !env.next.tree.hasTag(REFERENCE) &&
3337 sym.name != names._super &&
3338 (sym.kind == VAR || sym.kind == MTH)) {
3339 rs.accessBase(rs.new StaticError(sym),
3340 tree.pos(), site, sym.name, true);
3341 }
3342 }
3343 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
3344 sym.isStatic() && sym.kind == MTH) {
3345 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName);
3346 }
3347 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3348 // If the qualified item is not a type and the selected item is static, report
3349 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3350 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3351 }
3353 // If we are selecting an instance member via a `super', ...
3354 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3356 // Check that super-qualified symbols are not abstract (JLS)
3357 rs.checkNonAbstract(tree.pos(), sym);
3359 if (site.isRaw()) {
3360 // Determine argument types for site.
3361 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3362 if (site1 != null) site = site1;
3363 }
3364 }
3366 if (env.info.isSerializable) {
3367 chk.checkElemAccessFromSerializableLambda(tree);
3368 }
3370 env.info.selectSuper = selectSuperPrev;
3371 result = checkId(tree, site, sym, env, resultInfo);
3372 }
3373 //where
3374 /** Determine symbol referenced by a Select expression,
3375 *
3376 * @param tree The select tree.
3377 * @param site The type of the selected expression,
3378 * @param env The current environment.
3379 * @param resultInfo The current result.
3380 */
3381 private Symbol selectSym(JCFieldAccess tree,
3382 Symbol location,
3383 Type site,
3384 Env<AttrContext> env,
3385 ResultInfo resultInfo) {
3386 DiagnosticPosition pos = tree.pos();
3387 Name name = tree.name;
3388 switch (site.getTag()) {
3389 case PACKAGE:
3390 return rs.accessBase(
3391 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3392 pos, location, site, name, true);
3393 case ARRAY:
3394 case CLASS:
3395 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3396 return rs.resolveQualifiedMethod(
3397 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3398 } else if (name == names._this || name == names._super) {
3399 return rs.resolveSelf(pos, env, site.tsym, name);
3400 } else if (name == names._class) {
3401 // In this case, we have already made sure in
3402 // visitSelect that qualifier expression is a type.
3403 Type t = syms.classType;
3404 List<Type> typeargs = allowGenerics
3405 ? List.of(types.erasure(site))
3406 : List.<Type>nil();
3407 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3408 return new VarSymbol(
3409 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3410 } else {
3411 // We are seeing a plain identifier as selector.
3412 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3413 if ((resultInfo.pkind & ERRONEOUS) == 0)
3414 sym = rs.accessBase(sym, pos, location, site, name, true);
3415 return sym;
3416 }
3417 case WILDCARD:
3418 throw new AssertionError(tree);
3419 case TYPEVAR:
3420 // Normally, site.getUpperBound() shouldn't be null.
3421 // It should only happen during memberEnter/attribBase
3422 // when determining the super type which *must* beac
3423 // done before attributing the type variables. In
3424 // other words, we are seeing this illegal program:
3425 // class B<T> extends A<T.foo> {}
3426 Symbol sym = (site.getUpperBound() != null)
3427 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3428 : null;
3429 if (sym == null) {
3430 log.error(pos, "type.var.cant.be.deref");
3431 return syms.errSymbol;
3432 } else {
3433 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3434 rs.new AccessError(env, site, sym) :
3435 sym;
3436 rs.accessBase(sym2, pos, location, site, name, true);
3437 return sym;
3438 }
3439 case ERROR:
3440 // preserve identifier names through errors
3441 return types.createErrorType(name, site.tsym, site).tsym;
3442 default:
3443 // The qualifier expression is of a primitive type -- only
3444 // .class is allowed for these.
3445 if (name == names._class) {
3446 // In this case, we have already made sure in Select that
3447 // qualifier expression is a type.
3448 Type t = syms.classType;
3449 Type arg = types.boxedClass(site).type;
3450 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3451 return new VarSymbol(
3452 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3453 } else {
3454 log.error(pos, "cant.deref", site);
3455 return syms.errSymbol;
3456 }
3457 }
3458 }
3460 /** Determine type of identifier or select expression and check that
3461 * (1) the referenced symbol is not deprecated
3462 * (2) the symbol's type is safe (@see checkSafe)
3463 * (3) if symbol is a variable, check that its type and kind are
3464 * compatible with the prototype and protokind.
3465 * (4) if symbol is an instance field of a raw type,
3466 * which is being assigned to, issue an unchecked warning if its
3467 * type changes under erasure.
3468 * (5) if symbol is an instance method of a raw type, issue an
3469 * unchecked warning if its argument types change under erasure.
3470 * If checks succeed:
3471 * If symbol is a constant, return its constant type
3472 * else if symbol is a method, return its result type
3473 * otherwise return its type.
3474 * Otherwise return errType.
3475 *
3476 * @param tree The syntax tree representing the identifier
3477 * @param site If this is a select, the type of the selected
3478 * expression, otherwise the type of the current class.
3479 * @param sym The symbol representing the identifier.
3480 * @param env The current environment.
3481 * @param resultInfo The expected result
3482 */
3483 Type checkId(JCTree tree,
3484 Type site,
3485 Symbol sym,
3486 Env<AttrContext> env,
3487 ResultInfo resultInfo) {
3488 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3489 checkMethodId(tree, site, sym, env, resultInfo) :
3490 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3491 }
3493 Type checkMethodId(JCTree tree,
3494 Type site,
3495 Symbol sym,
3496 Env<AttrContext> env,
3497 ResultInfo resultInfo) {
3498 boolean isPolymorhicSignature =
3499 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3500 return isPolymorhicSignature ?
3501 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3502 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3503 }
3505 Type checkSigPolyMethodId(JCTree tree,
3506 Type site,
3507 Symbol sym,
3508 Env<AttrContext> env,
3509 ResultInfo resultInfo) {
3510 //recover original symbol for signature polymorphic methods
3511 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3512 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3513 return sym.type;
3514 }
3516 Type checkMethodIdInternal(JCTree tree,
3517 Type site,
3518 Symbol sym,
3519 Env<AttrContext> env,
3520 ResultInfo resultInfo) {
3521 if ((resultInfo.pkind & POLY) != 0) {
3522 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3523 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3524 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3525 return owntype;
3526 } else {
3527 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3528 }
3529 }
3531 Type checkIdInternal(JCTree tree,
3532 Type site,
3533 Symbol sym,
3534 Type pt,
3535 Env<AttrContext> env,
3536 ResultInfo resultInfo) {
3537 if (pt.isErroneous()) {
3538 return types.createErrorType(site);
3539 }
3540 Type owntype; // The computed type of this identifier occurrence.
3541 switch (sym.kind) {
3542 case TYP:
3543 // For types, the computed type equals the symbol's type,
3544 // except for two situations:
3545 owntype = sym.type;
3546 if (owntype.hasTag(CLASS)) {
3547 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3548 Type ownOuter = owntype.getEnclosingType();
3550 // (a) If the symbol's type is parameterized, erase it
3551 // because no type parameters were given.
3552 // We recover generic outer type later in visitTypeApply.
3553 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3554 owntype = types.erasure(owntype);
3555 }
3557 // (b) If the symbol's type is an inner class, then
3558 // we have to interpret its outer type as a superclass
3559 // of the site type. Example:
3560 //
3561 // class Tree<A> { class Visitor { ... } }
3562 // class PointTree extends Tree<Point> { ... }
3563 // ...PointTree.Visitor...
3564 //
3565 // Then the type of the last expression above is
3566 // Tree<Point>.Visitor.
3567 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3568 Type normOuter = site;
3569 if (normOuter.hasTag(CLASS)) {
3570 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3571 }
3572 if (normOuter == null) // perhaps from an import
3573 normOuter = types.erasure(ownOuter);
3574 if (normOuter != ownOuter)
3575 owntype = new ClassType(
3576 normOuter, List.<Type>nil(), owntype.tsym);
3577 }
3578 }
3579 break;
3580 case VAR:
3581 VarSymbol v = (VarSymbol)sym;
3582 // Test (4): if symbol is an instance field of a raw type,
3583 // which is being assigned to, issue an unchecked warning if
3584 // its type changes under erasure.
3585 if (allowGenerics &&
3586 resultInfo.pkind == VAR &&
3587 v.owner.kind == TYP &&
3588 (v.flags() & STATIC) == 0 &&
3589 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3590 Type s = types.asOuterSuper(site, v.owner);
3591 if (s != null &&
3592 s.isRaw() &&
3593 !types.isSameType(v.type, v.erasure(types))) {
3594 chk.warnUnchecked(tree.pos(),
3595 "unchecked.assign.to.var",
3596 v, s);
3597 }
3598 }
3599 // The computed type of a variable is the type of the
3600 // variable symbol, taken as a member of the site type.
3601 owntype = (sym.owner.kind == TYP &&
3602 sym.name != names._this && sym.name != names._super)
3603 ? types.memberType(site, sym)
3604 : sym.type;
3606 // If the variable is a constant, record constant value in
3607 // computed type.
3608 if (v.getConstValue() != null && isStaticReference(tree))
3609 owntype = owntype.constType(v.getConstValue());
3611 if (resultInfo.pkind == VAL) {
3612 owntype = capture(owntype); // capture "names as expressions"
3613 }
3614 break;
3615 case MTH: {
3616 owntype = checkMethod(site, sym,
3617 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3618 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3619 resultInfo.pt.getTypeArguments());
3620 break;
3621 }
3622 case PCK: case ERR:
3623 owntype = sym.type;
3624 break;
3625 default:
3626 throw new AssertionError("unexpected kind: " + sym.kind +
3627 " in tree " + tree);
3628 }
3630 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3631 // (for constructors, the error was given when the constructor was
3632 // resolved)
3634 if (sym.name != names.init) {
3635 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3636 chk.checkSunAPI(tree.pos(), sym);
3637 chk.checkProfile(tree.pos(), sym);
3638 }
3640 // Test (3): if symbol is a variable, check that its type and
3641 // kind are compatible with the prototype and protokind.
3642 return check(tree, owntype, sym.kind, resultInfo);
3643 }
3645 /** Check that variable is initialized and evaluate the variable's
3646 * initializer, if not yet done. Also check that variable is not
3647 * referenced before it is defined.
3648 * @param tree The tree making up the variable reference.
3649 * @param env The current environment.
3650 * @param v The variable's symbol.
3651 */
3652 private void checkInit(JCTree tree,
3653 Env<AttrContext> env,
3654 VarSymbol v,
3655 boolean onlyWarning) {
3656 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3657 // tree.pos + " " + v.pos + " " +
3658 // Resolve.isStatic(env));//DEBUG
3660 // A forward reference is diagnosed if the declaration position
3661 // of the variable is greater than the current tree position
3662 // and the tree and variable definition occur in the same class
3663 // definition. Note that writes don't count as references.
3664 // This check applies only to class and instance
3665 // variables. Local variables follow different scope rules,
3666 // and are subject to definite assignment checking.
3667 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3668 v.owner.kind == TYP &&
3669 enclosingInitEnv(env) != null &&
3670 v.owner == env.info.scope.owner.enclClass() &&
3671 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3672 (!env.tree.hasTag(ASSIGN) ||
3673 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3674 String suffix = (env.info.enclVar == v) ?
3675 "self.ref" : "forward.ref";
3676 if (!onlyWarning || isStaticEnumField(v)) {
3677 log.error(tree.pos(), "illegal." + suffix);
3678 } else if (useBeforeDeclarationWarning) {
3679 log.warning(tree.pos(), suffix, v);
3680 }
3681 }
3683 v.getConstValue(); // ensure initializer is evaluated
3685 checkEnumInitializer(tree, env, v);
3686 }
3688 /**
3689 * Returns the enclosing init environment associated with this env (if any). An init env
3690 * can be either a field declaration env or a static/instance initializer env.
3691 */
3692 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
3693 while (true) {
3694 switch (env.tree.getTag()) {
3695 case VARDEF:
3696 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
3697 if (vdecl.sym.owner.kind == TYP) {
3698 //field
3699 return env;
3700 }
3701 break;
3702 case BLOCK:
3703 if (env.next.tree.hasTag(CLASSDEF)) {
3704 //instance/static initializer
3705 return env;
3706 }
3707 break;
3708 case METHODDEF:
3709 case CLASSDEF:
3710 case TOPLEVEL:
3711 return null;
3712 }
3713 Assert.checkNonNull(env.next);
3714 env = env.next;
3715 }
3716 }
3718 /**
3719 * Check for illegal references to static members of enum. In
3720 * an enum type, constructors and initializers may not
3721 * reference its static members unless they are constant.
3722 *
3723 * @param tree The tree making up the variable reference.
3724 * @param env The current environment.
3725 * @param v The variable's symbol.
3726 * @jls section 8.9 Enums
3727 */
3728 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3729 // JLS:
3730 //
3731 // "It is a compile-time error to reference a static field
3732 // of an enum type that is not a compile-time constant
3733 // (15.28) from constructors, instance initializer blocks,
3734 // or instance variable initializer expressions of that
3735 // type. It is a compile-time error for the constructors,
3736 // instance initializer blocks, or instance variable
3737 // initializer expressions of an enum constant e to refer
3738 // to itself or to an enum constant of the same type that
3739 // is declared to the right of e."
3740 if (isStaticEnumField(v)) {
3741 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3743 if (enclClass == null || enclClass.owner == null)
3744 return;
3746 // See if the enclosing class is the enum (or a
3747 // subclass thereof) declaring v. If not, this
3748 // reference is OK.
3749 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3750 return;
3752 // If the reference isn't from an initializer, then
3753 // the reference is OK.
3754 if (!Resolve.isInitializer(env))
3755 return;
3757 log.error(tree.pos(), "illegal.enum.static.ref");
3758 }
3759 }
3761 /** Is the given symbol a static, non-constant field of an Enum?
3762 * Note: enum literals should not be regarded as such
3763 */
3764 private boolean isStaticEnumField(VarSymbol v) {
3765 return Flags.isEnum(v.owner) &&
3766 Flags.isStatic(v) &&
3767 !Flags.isConstant(v) &&
3768 v.name != names._class;
3769 }
3771 Warner noteWarner = new Warner();
3773 /**
3774 * Check that method arguments conform to its instantiation.
3775 **/
3776 public Type checkMethod(Type site,
3777 final Symbol sym,
3778 ResultInfo resultInfo,
3779 Env<AttrContext> env,
3780 final List<JCExpression> argtrees,
3781 List<Type> argtypes,
3782 List<Type> typeargtypes) {
3783 // Test (5): if symbol is an instance method of a raw type, issue
3784 // an unchecked warning if its argument types change under erasure.
3785 if (allowGenerics &&
3786 (sym.flags() & STATIC) == 0 &&
3787 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3788 Type s = types.asOuterSuper(site, sym.owner);
3789 if (s != null && s.isRaw() &&
3790 !types.isSameTypes(sym.type.getParameterTypes(),
3791 sym.erasure(types).getParameterTypes())) {
3792 chk.warnUnchecked(env.tree.pos(),
3793 "unchecked.call.mbr.of.raw.type",
3794 sym, s);
3795 }
3796 }
3798 if (env.info.defaultSuperCallSite != null) {
3799 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3800 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3801 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3802 List<MethodSymbol> icand_sup =
3803 types.interfaceCandidates(sup, (MethodSymbol)sym);
3804 if (icand_sup.nonEmpty() &&
3805 icand_sup.head != sym &&
3806 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3807 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3808 diags.fragment("overridden.default", sym, sup));
3809 break;
3810 }
3811 }
3812 env.info.defaultSuperCallSite = null;
3813 }
3815 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3816 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3817 if (app.meth.hasTag(SELECT) &&
3818 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3819 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3820 }
3821 }
3823 // Compute the identifier's instantiated type.
3824 // For methods, we need to compute the instance type by
3825 // Resolve.instantiate from the symbol's type as well as
3826 // any type arguments and value arguments.
3827 noteWarner.clear();
3828 try {
3829 Type owntype = rs.checkMethod(
3830 env,
3831 site,
3832 sym,
3833 resultInfo,
3834 argtypes,
3835 typeargtypes,
3836 noteWarner);
3838 DeferredAttr.DeferredTypeMap checkDeferredMap =
3839 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3841 argtypes = Type.map(argtypes, checkDeferredMap);
3843 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3844 chk.warnUnchecked(env.tree.pos(),
3845 "unchecked.meth.invocation.applied",
3846 kindName(sym),
3847 sym.name,
3848 rs.methodArguments(sym.type.getParameterTypes()),
3849 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3850 kindName(sym.location()),
3851 sym.location());
3852 owntype = new MethodType(owntype.getParameterTypes(),
3853 types.erasure(owntype.getReturnType()),
3854 types.erasure(owntype.getThrownTypes()),
3855 syms.methodClass);
3856 }
3858 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3859 resultInfo.checkContext.inferenceContext());
3860 } catch (Infer.InferenceException ex) {
3861 //invalid target type - propagate exception outwards or report error
3862 //depending on the current check context
3863 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3864 return types.createErrorType(site);
3865 } catch (Resolve.InapplicableMethodException ex) {
3866 final JCDiagnostic diag = ex.getDiagnostic();
3867 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3868 @Override
3869 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3870 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3871 }
3872 };
3873 List<Type> argtypes2 = Type.map(argtypes,
3874 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3875 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3876 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3877 log.report(errDiag);
3878 return types.createErrorType(site);
3879 }
3880 }
3882 public void visitLiteral(JCLiteral tree) {
3883 result = check(
3884 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3885 }
3886 //where
3887 /** Return the type of a literal with given type tag.
3888 */
3889 Type litType(TypeTag tag) {
3890 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3891 }
3893 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3894 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3895 }
3897 public void visitTypeArray(JCArrayTypeTree tree) {
3898 Type etype = attribType(tree.elemtype, env);
3899 Type type = new ArrayType(etype, syms.arrayClass);
3900 result = check(tree, type, TYP, resultInfo);
3901 }
3903 /** Visitor method for parameterized types.
3904 * Bound checking is left until later, since types are attributed
3905 * before supertype structure is completely known
3906 */
3907 public void visitTypeApply(JCTypeApply tree) {
3908 Type owntype = types.createErrorType(tree.type);
3910 // Attribute functor part of application and make sure it's a class.
3911 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3913 // Attribute type parameters
3914 List<Type> actuals = attribTypes(tree.arguments, env);
3916 if (clazztype.hasTag(CLASS)) {
3917 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3918 if (actuals.isEmpty()) //diamond
3919 actuals = formals;
3921 if (actuals.length() == formals.length()) {
3922 List<Type> a = actuals;
3923 List<Type> f = formals;
3924 while (a.nonEmpty()) {
3925 a.head = a.head.withTypeVar(f.head);
3926 a = a.tail;
3927 f = f.tail;
3928 }
3929 // Compute the proper generic outer
3930 Type clazzOuter = clazztype.getEnclosingType();
3931 if (clazzOuter.hasTag(CLASS)) {
3932 Type site;
3933 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3934 if (clazz.hasTag(IDENT)) {
3935 site = env.enclClass.sym.type;
3936 } else if (clazz.hasTag(SELECT)) {
3937 site = ((JCFieldAccess) clazz).selected.type;
3938 } else throw new AssertionError(""+tree);
3939 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3940 if (site.hasTag(CLASS))
3941 site = types.asOuterSuper(site, clazzOuter.tsym);
3942 if (site == null)
3943 site = types.erasure(clazzOuter);
3944 clazzOuter = site;
3945 }
3946 }
3947 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3948 } else {
3949 if (formals.length() != 0) {
3950 log.error(tree.pos(), "wrong.number.type.args",
3951 Integer.toString(formals.length()));
3952 } else {
3953 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3954 }
3955 owntype = types.createErrorType(tree.type);
3956 }
3957 }
3958 result = check(tree, owntype, TYP, resultInfo);
3959 }
3961 public void visitTypeUnion(JCTypeUnion tree) {
3962 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3963 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3964 for (JCExpression typeTree : tree.alternatives) {
3965 Type ctype = attribType(typeTree, env);
3966 ctype = chk.checkType(typeTree.pos(),
3967 chk.checkClassType(typeTree.pos(), ctype),
3968 syms.throwableType);
3969 if (!ctype.isErroneous()) {
3970 //check that alternatives of a union type are pairwise
3971 //unrelated w.r.t. subtyping
3972 if (chk.intersects(ctype, multicatchTypes.toList())) {
3973 for (Type t : multicatchTypes) {
3974 boolean sub = types.isSubtype(ctype, t);
3975 boolean sup = types.isSubtype(t, ctype);
3976 if (sub || sup) {
3977 //assume 'a' <: 'b'
3978 Type a = sub ? ctype : t;
3979 Type b = sub ? t : ctype;
3980 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3981 }
3982 }
3983 }
3984 multicatchTypes.append(ctype);
3985 if (all_multicatchTypes != null)
3986 all_multicatchTypes.append(ctype);
3987 } else {
3988 if (all_multicatchTypes == null) {
3989 all_multicatchTypes = new ListBuffer<>();
3990 all_multicatchTypes.appendList(multicatchTypes);
3991 }
3992 all_multicatchTypes.append(ctype);
3993 }
3994 }
3995 Type t = check(noCheckTree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3996 if (t.hasTag(CLASS)) {
3997 List<Type> alternatives =
3998 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3999 t = new UnionClassType((ClassType) t, alternatives);
4000 }
4001 tree.type = result = t;
4002 }
4004 public void visitTypeIntersection(JCTypeIntersection tree) {
4005 attribTypes(tree.bounds, env);
4006 tree.type = result = checkIntersection(tree, tree.bounds);
4007 }
4009 public void visitTypeParameter(JCTypeParameter tree) {
4010 TypeVar typeVar = (TypeVar) tree.type;
4012 if (tree.annotations != null && tree.annotations.nonEmpty()) {
4013 annotateType(tree, tree.annotations);
4014 }
4016 if (!typeVar.bound.isErroneous()) {
4017 //fixup type-parameter bound computed in 'attribTypeVariables'
4018 typeVar.bound = checkIntersection(tree, tree.bounds);
4019 }
4020 }
4022 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
4023 Set<Type> boundSet = new HashSet<Type>();
4024 if (bounds.nonEmpty()) {
4025 // accept class or interface or typevar as first bound.
4026 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4027 boundSet.add(types.erasure(bounds.head.type));
4028 if (bounds.head.type.isErroneous()) {
4029 return bounds.head.type;
4030 }
4031 else if (bounds.head.type.hasTag(TYPEVAR)) {
4032 // if first bound was a typevar, do not accept further bounds.
4033 if (bounds.tail.nonEmpty()) {
4034 log.error(bounds.tail.head.pos(),
4035 "type.var.may.not.be.followed.by.other.bounds");
4036 return bounds.head.type;
4037 }
4038 } else {
4039 // if first bound was a class or interface, accept only interfaces
4040 // as further bounds.
4041 for (JCExpression bound : bounds.tail) {
4042 bound.type = checkBase(bound.type, bound, env, false, true, false);
4043 if (bound.type.isErroneous()) {
4044 bounds = List.of(bound);
4045 }
4046 else if (bound.type.hasTag(CLASS)) {
4047 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4048 }
4049 }
4050 }
4051 }
4053 if (bounds.length() == 0) {
4054 return syms.objectType;
4055 } else if (bounds.length() == 1) {
4056 return bounds.head.type;
4057 } else {
4058 Type owntype = types.makeIntersectionType(TreeInfo.types(bounds));
4059 // ... the variable's bound is a class type flagged COMPOUND
4060 // (see comment for TypeVar.bound).
4061 // In this case, generate a class tree that represents the
4062 // bound class, ...
4063 JCExpression extending;
4064 List<JCExpression> implementing;
4065 if (!bounds.head.type.isInterface()) {
4066 extending = bounds.head;
4067 implementing = bounds.tail;
4068 } else {
4069 extending = null;
4070 implementing = bounds;
4071 }
4072 JCClassDecl cd = make.at(tree).ClassDef(
4073 make.Modifiers(PUBLIC | ABSTRACT),
4074 names.empty, List.<JCTypeParameter>nil(),
4075 extending, implementing, List.<JCTree>nil());
4077 ClassSymbol c = (ClassSymbol)owntype.tsym;
4078 Assert.check((c.flags() & COMPOUND) != 0);
4079 cd.sym = c;
4080 c.sourcefile = env.toplevel.sourcefile;
4082 // ... and attribute the bound class
4083 c.flags_field |= UNATTRIBUTED;
4084 Env<AttrContext> cenv = enter.classEnv(cd, env);
4085 typeEnvs.put(c, cenv);
4086 attribClass(c);
4087 return owntype;
4088 }
4089 }
4091 public void visitWildcard(JCWildcard tree) {
4092 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4093 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4094 ? syms.objectType
4095 : attribType(tree.inner, env);
4096 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4097 tree.kind.kind,
4098 syms.boundClass),
4099 TYP, resultInfo);
4100 }
4102 public void visitAnnotation(JCAnnotation tree) {
4103 Assert.error("should be handled in Annotate");
4104 }
4106 public void visitAnnotatedType(JCAnnotatedType tree) {
4107 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4108 this.attribAnnotationTypes(tree.annotations, env);
4109 annotateType(tree, tree.annotations);
4110 result = tree.type = underlyingType;
4111 }
4113 /**
4114 * Apply the annotations to the particular type.
4115 */
4116 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4117 annotate.typeAnnotation(new Annotate.Worker() {
4118 @Override
4119 public String toString() {
4120 return "annotate " + annotations + " onto " + tree;
4121 }
4122 @Override
4123 public void run() {
4124 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4125 if (annotations.size() == compounds.size()) {
4126 // All annotations were successfully converted into compounds
4127 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4128 }
4129 }
4130 });
4131 }
4133 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4134 if (annotations.isEmpty()) {
4135 return List.nil();
4136 }
4138 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4139 for (JCAnnotation anno : annotations) {
4140 if (anno.attribute != null) {
4141 // TODO: this null-check is only needed for an obscure
4142 // ordering issue, where annotate.flush is called when
4143 // the attribute is not set yet. For an example failure
4144 // try the referenceinfos/NestedTypes.java test.
4145 // Any better solutions?
4146 buf.append((Attribute.TypeCompound) anno.attribute);
4147 }
4148 // Eventually we will want to throw an exception here, but
4149 // we can't do that just yet, because it gets triggered
4150 // when attempting to attach an annotation that isn't
4151 // defined.
4152 }
4153 return buf.toList();
4154 }
4156 public void visitErroneous(JCErroneous tree) {
4157 if (tree.errs != null)
4158 for (JCTree err : tree.errs)
4159 attribTree(err, env, new ResultInfo(ERR, pt()));
4160 result = tree.type = syms.errType;
4161 }
4163 /** Default visitor method for all other trees.
4164 */
4165 public void visitTree(JCTree tree) {
4166 throw new AssertionError();
4167 }
4169 /**
4170 * Attribute an env for either a top level tree or class declaration.
4171 */
4172 public void attrib(Env<AttrContext> env) {
4173 if (env.tree.hasTag(TOPLEVEL))
4174 attribTopLevel(env);
4175 else
4176 attribClass(env.tree.pos(), env.enclClass.sym);
4177 }
4179 /**
4180 * Attribute a top level tree. These trees are encountered when the
4181 * package declaration has annotations.
4182 */
4183 public void attribTopLevel(Env<AttrContext> env) {
4184 JCCompilationUnit toplevel = env.toplevel;
4185 try {
4186 annotate.flush();
4187 } catch (CompletionFailure ex) {
4188 chk.completionError(toplevel.pos(), ex);
4189 }
4190 }
4192 /** Main method: attribute class definition associated with given class symbol.
4193 * reporting completion failures at the given position.
4194 * @param pos The source position at which completion errors are to be
4195 * reported.
4196 * @param c The class symbol whose definition will be attributed.
4197 */
4198 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4199 try {
4200 annotate.flush();
4201 attribClass(c);
4202 } catch (CompletionFailure ex) {
4203 chk.completionError(pos, ex);
4204 }
4205 }
4207 /** Attribute class definition associated with given class symbol.
4208 * @param c The class symbol whose definition will be attributed.
4209 */
4210 void attribClass(ClassSymbol c) throws CompletionFailure {
4211 if (c.type.hasTag(ERROR)) return;
4213 // Check for cycles in the inheritance graph, which can arise from
4214 // ill-formed class files.
4215 chk.checkNonCyclic(null, c.type);
4217 Type st = types.supertype(c.type);
4218 if ((c.flags_field & Flags.COMPOUND) == 0) {
4219 // First, attribute superclass.
4220 if (st.hasTag(CLASS))
4221 attribClass((ClassSymbol)st.tsym);
4223 // Next attribute owner, if it is a class.
4224 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4225 attribClass((ClassSymbol)c.owner);
4226 }
4228 // The previous operations might have attributed the current class
4229 // if there was a cycle. So we test first whether the class is still
4230 // UNATTRIBUTED.
4231 if ((c.flags_field & UNATTRIBUTED) != 0) {
4232 c.flags_field &= ~UNATTRIBUTED;
4234 // Get environment current at the point of class definition.
4235 Env<AttrContext> env = typeEnvs.get(c);
4237 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
4238 // because the annotations were not available at the time the env was created. Therefore,
4239 // we look up the environment chain for the first enclosing environment for which the
4240 // lint value is set. Typically, this is the parent env, but might be further if there
4241 // are any envs created as a result of TypeParameter nodes.
4242 Env<AttrContext> lintEnv = env;
4243 while (lintEnv.info.lint == null)
4244 lintEnv = lintEnv.next;
4246 // Having found the enclosing lint value, we can initialize the lint value for this class
4247 env.info.lint = lintEnv.info.lint.augment(c);
4249 Lint prevLint = chk.setLint(env.info.lint);
4250 JavaFileObject prev = log.useSource(c.sourcefile);
4251 ResultInfo prevReturnRes = env.info.returnResult;
4253 try {
4254 deferredLintHandler.flush(env.tree);
4255 env.info.returnResult = null;
4256 // java.lang.Enum may not be subclassed by a non-enum
4257 if (st.tsym == syms.enumSym &&
4258 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4259 log.error(env.tree.pos(), "enum.no.subclassing");
4261 // Enums may not be extended by source-level classes
4262 if (st.tsym != null &&
4263 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4264 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4265 log.error(env.tree.pos(), "enum.types.not.extensible");
4266 }
4268 if (isSerializable(c.type)) {
4269 env.info.isSerializable = true;
4270 }
4272 attribClassBody(env, c);
4274 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4275 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4276 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4277 } finally {
4278 env.info.returnResult = prevReturnRes;
4279 log.useSource(prev);
4280 chk.setLint(prevLint);
4281 }
4283 }
4284 }
4286 public void visitImport(JCImport tree) {
4287 // nothing to do
4288 }
4290 /** Finish the attribution of a class. */
4291 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4292 JCClassDecl tree = (JCClassDecl)env.tree;
4293 Assert.check(c == tree.sym);
4295 // Validate type parameters, supertype and interfaces.
4296 attribStats(tree.typarams, env);
4297 if (!c.isAnonymous()) {
4298 //already checked if anonymous
4299 chk.validate(tree.typarams, env);
4300 chk.validate(tree.extending, env);
4301 chk.validate(tree.implementing, env);
4302 }
4304 c.markAbstractIfNeeded(types);
4306 // If this is a non-abstract class, check that it has no abstract
4307 // methods or unimplemented methods of an implemented interface.
4308 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4309 if (!relax)
4310 chk.checkAllDefined(tree.pos(), c);
4311 }
4313 if ((c.flags() & ANNOTATION) != 0) {
4314 if (tree.implementing.nonEmpty())
4315 log.error(tree.implementing.head.pos(),
4316 "cant.extend.intf.annotation");
4317 if (tree.typarams.nonEmpty())
4318 log.error(tree.typarams.head.pos(),
4319 "intf.annotation.cant.have.type.params");
4321 // If this annotation has a @Repeatable, validate
4322 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4323 if (repeatable != null) {
4324 // get diagnostic position for error reporting
4325 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4326 Assert.checkNonNull(cbPos);
4328 chk.validateRepeatable(c, repeatable, cbPos);
4329 }
4330 } else {
4331 // Check that all extended classes and interfaces
4332 // are compatible (i.e. no two define methods with same arguments
4333 // yet different return types). (JLS 8.4.6.3)
4334 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4335 if (allowDefaultMethods) {
4336 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4337 }
4338 }
4340 // Check that class does not import the same parameterized interface
4341 // with two different argument lists.
4342 chk.checkClassBounds(tree.pos(), c.type);
4344 tree.type = c.type;
4346 for (List<JCTypeParameter> l = tree.typarams;
4347 l.nonEmpty(); l = l.tail) {
4348 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4349 }
4351 // Check that a generic class doesn't extend Throwable
4352 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4353 log.error(tree.extending.pos(), "generic.throwable");
4355 // Check that all methods which implement some
4356 // method conform to the method they implement.
4357 chk.checkImplementations(tree);
4359 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4360 checkAutoCloseable(tree.pos(), env, c.type);
4362 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4363 // Attribute declaration
4364 attribStat(l.head, env);
4365 // Check that declarations in inner classes are not static (JLS 8.1.2)
4366 // Make an exception for static constants.
4367 if (c.owner.kind != PCK &&
4368 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4369 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4370 Symbol sym = null;
4371 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4372 if (sym == null ||
4373 sym.kind != VAR ||
4374 ((VarSymbol) sym).getConstValue() == null)
4375 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4376 }
4377 }
4379 // Check for cycles among non-initial constructors.
4380 chk.checkCyclicConstructors(tree);
4382 // Check for cycles among annotation elements.
4383 chk.checkNonCyclicElements(tree);
4385 // Check for proper use of serialVersionUID
4386 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4387 isSerializable(c.type) &&
4388 (c.flags() & Flags.ENUM) == 0 &&
4389 checkForSerial(c)) {
4390 checkSerialVersionUID(tree, c);
4391 }
4392 if (allowTypeAnnos) {
4393 // Correctly organize the postions of the type annotations
4394 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4396 // Check type annotations applicability rules
4397 validateTypeAnnotations(tree, false);
4398 }
4399 }
4400 // where
4401 boolean checkForSerial(ClassSymbol c) {
4402 if ((c.flags() & ABSTRACT) == 0) {
4403 return true;
4404 } else {
4405 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4406 }
4407 }
4409 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4410 @Override
4411 public boolean accepts(Symbol s) {
4412 return s.kind == Kinds.MTH &&
4413 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4414 }
4415 };
4417 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4418 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4419 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4420 if (types.isSameType(al.head.annotationType.type, t))
4421 return al.head.pos();
4422 }
4424 return null;
4425 }
4427 /** check if a type is a subtype of Serializable, if that is available. */
4428 boolean isSerializable(Type t) {
4429 try {
4430 syms.serializableType.complete();
4431 }
4432 catch (CompletionFailure e) {
4433 return false;
4434 }
4435 return types.isSubtype(t, syms.serializableType);
4436 }
4438 /** Check that an appropriate serialVersionUID member is defined. */
4439 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4441 // check for presence of serialVersionUID
4442 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4443 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4444 if (e.scope == null) {
4445 log.warning(LintCategory.SERIAL,
4446 tree.pos(), "missing.SVUID", c);
4447 return;
4448 }
4450 // check that it is static final
4451 VarSymbol svuid = (VarSymbol)e.sym;
4452 if ((svuid.flags() & (STATIC | FINAL)) !=
4453 (STATIC | FINAL))
4454 log.warning(LintCategory.SERIAL,
4455 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4457 // check that it is long
4458 else if (!svuid.type.hasTag(LONG))
4459 log.warning(LintCategory.SERIAL,
4460 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4462 // check constant
4463 else if (svuid.getConstValue() == null)
4464 log.warning(LintCategory.SERIAL,
4465 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4466 }
4468 private Type capture(Type type) {
4469 return types.capture(type);
4470 }
4472 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4473 tree.accept(new TypeAnnotationsValidator(sigOnly));
4474 }
4475 //where
4476 private final class TypeAnnotationsValidator extends TreeScanner {
4478 private final boolean sigOnly;
4479 public TypeAnnotationsValidator(boolean sigOnly) {
4480 this.sigOnly = sigOnly;
4481 }
4483 public void visitAnnotation(JCAnnotation tree) {
4484 chk.validateTypeAnnotation(tree, false);
4485 super.visitAnnotation(tree);
4486 }
4487 public void visitAnnotatedType(JCAnnotatedType tree) {
4488 if (!tree.underlyingType.type.isErroneous()) {
4489 super.visitAnnotatedType(tree);
4490 }
4491 }
4492 public void visitTypeParameter(JCTypeParameter tree) {
4493 chk.validateTypeAnnotations(tree.annotations, true);
4494 scan(tree.bounds);
4495 // Don't call super.
4496 // This is needed because above we call validateTypeAnnotation with
4497 // false, which would forbid annotations on type parameters.
4498 // super.visitTypeParameter(tree);
4499 }
4500 public void visitMethodDef(JCMethodDecl tree) {
4501 if (tree.recvparam != null &&
4502 !tree.recvparam.vartype.type.isErroneous()) {
4503 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4504 tree.recvparam.vartype.type.tsym);
4505 }
4506 if (tree.restype != null && tree.restype.type != null) {
4507 validateAnnotatedType(tree.restype, tree.restype.type);
4508 }
4509 if (sigOnly) {
4510 scan(tree.mods);
4511 scan(tree.restype);
4512 scan(tree.typarams);
4513 scan(tree.recvparam);
4514 scan(tree.params);
4515 scan(tree.thrown);
4516 } else {
4517 scan(tree.defaultValue);
4518 scan(tree.body);
4519 }
4520 }
4521 public void visitVarDef(final JCVariableDecl tree) {
4522 if (tree.sym != null && tree.sym.type != null)
4523 validateAnnotatedType(tree.vartype, tree.sym.type);
4524 scan(tree.mods);
4525 scan(tree.vartype);
4526 if (!sigOnly) {
4527 scan(tree.init);
4528 }
4529 }
4530 public void visitTypeCast(JCTypeCast tree) {
4531 if (tree.clazz != null && tree.clazz.type != null)
4532 validateAnnotatedType(tree.clazz, tree.clazz.type);
4533 super.visitTypeCast(tree);
4534 }
4535 public void visitTypeTest(JCInstanceOf tree) {
4536 if (tree.clazz != null && tree.clazz.type != null)
4537 validateAnnotatedType(tree.clazz, tree.clazz.type);
4538 super.visitTypeTest(tree);
4539 }
4540 public void visitNewClass(JCNewClass tree) {
4541 if (tree.clazz != null && tree.clazz.type != null) {
4542 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4543 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4544 tree.clazz.type.tsym);
4545 }
4546 if (tree.def != null) {
4547 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4548 }
4550 validateAnnotatedType(tree.clazz, tree.clazz.type);
4551 }
4552 super.visitNewClass(tree);
4553 }
4554 public void visitNewArray(JCNewArray tree) {
4555 if (tree.elemtype != null && tree.elemtype.type != null) {
4556 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4557 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4558 tree.elemtype.type.tsym);
4559 }
4560 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4561 }
4562 super.visitNewArray(tree);
4563 }
4564 public void visitClassDef(JCClassDecl tree) {
4565 if (sigOnly) {
4566 scan(tree.mods);
4567 scan(tree.typarams);
4568 scan(tree.extending);
4569 scan(tree.implementing);
4570 }
4571 for (JCTree member : tree.defs) {
4572 if (member.hasTag(Tag.CLASSDEF)) {
4573 continue;
4574 }
4575 scan(member);
4576 }
4577 }
4578 public void visitBlock(JCBlock tree) {
4579 if (!sigOnly) {
4580 scan(tree.stats);
4581 }
4582 }
4584 /* I would want to model this after
4585 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4586 * and override visitSelect and visitTypeApply.
4587 * However, we only set the annotated type in the top-level type
4588 * of the symbol.
4589 * Therefore, we need to override each individual location where a type
4590 * can occur.
4591 */
4592 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4593 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4595 if (type.isPrimitiveOrVoid()) {
4596 return;
4597 }
4599 JCTree enclTr = errtree;
4600 Type enclTy = type;
4602 boolean repeat = true;
4603 while (repeat) {
4604 if (enclTr.hasTag(TYPEAPPLY)) {
4605 List<Type> tyargs = enclTy.getTypeArguments();
4606 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4607 if (trargs.length() > 0) {
4608 // Nothing to do for diamonds
4609 if (tyargs.length() == trargs.length()) {
4610 for (int i = 0; i < tyargs.length(); ++i) {
4611 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4612 }
4613 }
4614 // If the lengths don't match, it's either a diamond
4615 // or some nested type that redundantly provides
4616 // type arguments in the tree.
4617 }
4619 // Look at the clazz part of a generic type
4620 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4621 }
4623 if (enclTr.hasTag(SELECT)) {
4624 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4625 if (enclTy != null &&
4626 !enclTy.hasTag(NONE)) {
4627 enclTy = enclTy.getEnclosingType();
4628 }
4629 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4630 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4631 if (enclTy == null ||
4632 enclTy.hasTag(NONE)) {
4633 if (at.getAnnotations().size() == 1) {
4634 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4635 } else {
4636 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4637 for (JCAnnotation an : at.getAnnotations()) {
4638 comps.add(an.attribute);
4639 }
4640 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4641 }
4642 repeat = false;
4643 }
4644 enclTr = at.underlyingType;
4645 // enclTy doesn't need to be changed
4646 } else if (enclTr.hasTag(IDENT)) {
4647 repeat = false;
4648 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4649 JCWildcard wc = (JCWildcard) enclTr;
4650 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4651 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4652 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4653 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4654 } else {
4655 // Nothing to do for UNBOUND
4656 }
4657 repeat = false;
4658 } else if (enclTr.hasTag(TYPEARRAY)) {
4659 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4660 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4661 repeat = false;
4662 } else if (enclTr.hasTag(TYPEUNION)) {
4663 JCTypeUnion ut = (JCTypeUnion) enclTr;
4664 for (JCTree t : ut.getTypeAlternatives()) {
4665 validateAnnotatedType(t, t.type);
4666 }
4667 repeat = false;
4668 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4669 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4670 for (JCTree t : it.getBounds()) {
4671 validateAnnotatedType(t, t.type);
4672 }
4673 repeat = false;
4674 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4675 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4676 repeat = false;
4677 } else {
4678 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4679 " within: "+ errtree + " with kind: " + errtree.getKind());
4680 }
4681 }
4682 }
4684 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
4685 Symbol sym) {
4686 // Ensure that no declaration annotations are present.
4687 // Note that a tree type might be an AnnotatedType with
4688 // empty annotations, if only declaration annotations were given.
4689 // This method will raise an error for such a type.
4690 for (JCAnnotation ai : annotations) {
4691 if (!ai.type.isErroneous() &&
4692 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
4693 log.error(ai.pos(), "annotation.type.not.applicable");
4694 }
4695 }
4696 }
4697 };
4699 // <editor-fold desc="post-attribution visitor">
4701 /**
4702 * Handle missing types/symbols in an AST. This routine is useful when
4703 * the compiler has encountered some errors (which might have ended up
4704 * terminating attribution abruptly); if the compiler is used in fail-over
4705 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4706 * prevents NPE to be progagated during subsequent compilation steps.
4707 */
4708 public void postAttr(JCTree tree) {
4709 new PostAttrAnalyzer().scan(tree);
4710 }
4712 class PostAttrAnalyzer extends TreeScanner {
4714 private void initTypeIfNeeded(JCTree that) {
4715 if (that.type == null) {
4716 if (that.hasTag(METHODDEF)) {
4717 that.type = dummyMethodType((JCMethodDecl)that);
4718 } else {
4719 that.type = syms.unknownType;
4720 }
4721 }
4722 }
4724 /* Construct a dummy method type. If we have a method declaration,
4725 * and the declared return type is void, then use that return type
4726 * instead of UNKNOWN to avoid spurious error messages in lambda
4727 * bodies (see:JDK-8041704).
4728 */
4729 private Type dummyMethodType(JCMethodDecl md) {
4730 Type restype = syms.unknownType;
4731 if (md != null && md.restype.hasTag(TYPEIDENT)) {
4732 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
4733 if (prim.typetag == VOID)
4734 restype = syms.voidType;
4735 }
4736 return new MethodType(List.<Type>nil(), restype,
4737 List.<Type>nil(), syms.methodClass);
4738 }
4739 private Type dummyMethodType() {
4740 return dummyMethodType(null);
4741 }
4743 @Override
4744 public void scan(JCTree tree) {
4745 if (tree == null) return;
4746 if (tree instanceof JCExpression) {
4747 initTypeIfNeeded(tree);
4748 }
4749 super.scan(tree);
4750 }
4752 @Override
4753 public void visitIdent(JCIdent that) {
4754 if (that.sym == null) {
4755 that.sym = syms.unknownSymbol;
4756 }
4757 }
4759 @Override
4760 public void visitSelect(JCFieldAccess that) {
4761 if (that.sym == null) {
4762 that.sym = syms.unknownSymbol;
4763 }
4764 super.visitSelect(that);
4765 }
4767 @Override
4768 public void visitClassDef(JCClassDecl that) {
4769 initTypeIfNeeded(that);
4770 if (that.sym == null) {
4771 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4772 }
4773 super.visitClassDef(that);
4774 }
4776 @Override
4777 public void visitMethodDef(JCMethodDecl that) {
4778 initTypeIfNeeded(that);
4779 if (that.sym == null) {
4780 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4781 }
4782 super.visitMethodDef(that);
4783 }
4785 @Override
4786 public void visitVarDef(JCVariableDecl that) {
4787 initTypeIfNeeded(that);
4788 if (that.sym == null) {
4789 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4790 that.sym.adr = 0;
4791 }
4792 super.visitVarDef(that);
4793 }
4795 @Override
4796 public void visitNewClass(JCNewClass that) {
4797 if (that.constructor == null) {
4798 that.constructor = new MethodSymbol(0, names.init,
4799 dummyMethodType(), syms.noSymbol);
4800 }
4801 if (that.constructorType == null) {
4802 that.constructorType = syms.unknownType;
4803 }
4804 super.visitNewClass(that);
4805 }
4807 @Override
4808 public void visitAssignop(JCAssignOp that) {
4809 if (that.operator == null) {
4810 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4811 -1, syms.noSymbol);
4812 }
4813 super.visitAssignop(that);
4814 }
4816 @Override
4817 public void visitBinary(JCBinary that) {
4818 if (that.operator == null) {
4819 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4820 -1, syms.noSymbol);
4821 }
4822 super.visitBinary(that);
4823 }
4825 @Override
4826 public void visitUnary(JCUnary that) {
4827 if (that.operator == null) {
4828 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4829 -1, syms.noSymbol);
4830 }
4831 super.visitUnary(that);
4832 }
4834 @Override
4835 public void visitLambda(JCLambda that) {
4836 super.visitLambda(that);
4837 if (that.targets == null) {
4838 that.targets = List.nil();
4839 }
4840 }
4842 @Override
4843 public void visitReference(JCMemberReference that) {
4844 super.visitReference(that);
4845 if (that.sym == null) {
4846 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
4847 syms.noSymbol);
4848 }
4849 if (that.targets == null) {
4850 that.targets = List.nil();
4851 }
4852 }
4853 }
4854 // </editor-fold>
4855 }