Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@64e79d38bd07
src/share/classes/com/sun/tools/javac/comp/Attr.java
Mon, 23 Sep 2013 18:29:27 +0400
- author
- kizune
- date
- Mon, 23 Sep 2013 18:29:27 +0400
- changeset 2049
- 64e79d38bd07
- parent 2047
- 5f915a0c9615
- child 2056
- 5043e7056be8
- permissions
- -rw-r--r--
4881267: improve diagnostic for "instanceof T" for type parameter T
Reviewed-by: vromero, jjg
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
34 import com.sun.source.tree.IdentifierTree;
35 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
36 import com.sun.source.tree.MemberSelectTree;
37 import com.sun.source.tree.TreeVisitor;
38 import com.sun.source.util.SimpleTreeVisitor;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.code.Type.*;
43 import com.sun.tools.javac.comp.Check.CheckContext;
44 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
45 import com.sun.tools.javac.comp.Infer.InferenceContext;
46 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.tree.*;
49 import com.sun.tools.javac.tree.JCTree.*;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
53 import com.sun.tools.javac.util.List;
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Flags.ANNOTATION;
56 import static com.sun.tools.javac.code.Flags.BLOCK;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
59 import static com.sun.tools.javac.code.TypeTag.*;
60 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
61 import static com.sun.tools.javac.tree.JCTree.Tag.*;
63 /** This is the main context-dependent analysis phase in GJC. It
64 * encompasses name resolution, type checking and constant folding as
65 * subtasks. Some subtasks involve auxiliary classes.
66 * @see Check
67 * @see Resolve
68 * @see ConstFold
69 * @see Infer
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Attr extends JCTree.Visitor {
77 protected static final Context.Key<Attr> attrKey =
78 new Context.Key<Attr>();
80 final Names names;
81 final Log log;
82 final Symtab syms;
83 final Resolve rs;
84 final Infer infer;
85 final DeferredAttr deferredAttr;
86 final Check chk;
87 final Flow flow;
88 final MemberEnter memberEnter;
89 final TreeMaker make;
90 final ConstFold cfolder;
91 final Enter enter;
92 final Target target;
93 final Types types;
94 final JCDiagnostic.Factory diags;
95 final Annotate annotate;
96 final DeferredLintHandler deferredLintHandler;
98 public static Attr instance(Context context) {
99 Attr instance = context.get(attrKey);
100 if (instance == null)
101 instance = new Attr(context);
102 return instance;
103 }
105 protected Attr(Context context) {
106 context.put(attrKey, this);
108 names = Names.instance(context);
109 log = Log.instance(context);
110 syms = Symtab.instance(context);
111 rs = Resolve.instance(context);
112 chk = Check.instance(context);
113 flow = Flow.instance(context);
114 memberEnter = MemberEnter.instance(context);
115 make = TreeMaker.instance(context);
116 enter = Enter.instance(context);
117 infer = Infer.instance(context);
118 deferredAttr = DeferredAttr.instance(context);
119 cfolder = ConstFold.instance(context);
120 target = Target.instance(context);
121 types = Types.instance(context);
122 diags = JCDiagnostic.Factory.instance(context);
123 annotate = Annotate.instance(context);
124 deferredLintHandler = DeferredLintHandler.instance(context);
126 Options options = Options.instance(context);
128 Source source = Source.instance(context);
129 allowGenerics = source.allowGenerics();
130 allowVarargs = source.allowVarargs();
131 allowEnums = source.allowEnums();
132 allowBoxing = source.allowBoxing();
133 allowCovariantReturns = source.allowCovariantReturns();
134 allowAnonOuterThis = source.allowAnonOuterThis();
135 allowStringsInSwitch = source.allowStringsInSwitch();
136 allowPoly = source.allowPoly();
137 allowTypeAnnos = source.allowTypeAnnotations();
138 allowLambda = source.allowLambda();
139 allowDefaultMethods = source.allowDefaultMethods();
140 sourceName = source.name;
141 relax = (options.isSet("-retrofit") ||
142 options.isSet("-relax"));
143 findDiamonds = options.get("findDiamond") != null &&
144 source.allowDiamond();
145 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
146 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
148 statInfo = new ResultInfo(NIL, Type.noType);
149 varInfo = new ResultInfo(VAR, Type.noType);
150 unknownExprInfo = new ResultInfo(VAL, Type.noType);
151 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
152 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
153 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
154 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
155 }
157 /** Switch: relax some constraints for retrofit mode.
158 */
159 boolean relax;
161 /** Switch: support target-typing inference
162 */
163 boolean allowPoly;
165 /** Switch: support type annotations.
166 */
167 boolean allowTypeAnnos;
169 /** Switch: support generics?
170 */
171 boolean allowGenerics;
173 /** Switch: allow variable-arity methods.
174 */
175 boolean allowVarargs;
177 /** Switch: support enums?
178 */
179 boolean allowEnums;
181 /** Switch: support boxing and unboxing?
182 */
183 boolean allowBoxing;
185 /** Switch: support covariant result types?
186 */
187 boolean allowCovariantReturns;
189 /** Switch: support lambda expressions ?
190 */
191 boolean allowLambda;
193 /** Switch: support default methods ?
194 */
195 boolean allowDefaultMethods;
197 /** Switch: allow references to surrounding object from anonymous
198 * objects during constructor call?
199 */
200 boolean allowAnonOuterThis;
202 /** Switch: generates a warning if diamond can be safely applied
203 * to a given new expression
204 */
205 boolean findDiamonds;
207 /**
208 * Internally enables/disables diamond finder feature
209 */
210 static final boolean allowDiamondFinder = true;
212 /**
213 * Switch: warn about use of variable before declaration?
214 * RFE: 6425594
215 */
216 boolean useBeforeDeclarationWarning;
218 /**
219 * Switch: generate warnings whenever an anonymous inner class that is convertible
220 * to a lambda expression is found
221 */
222 boolean identifyLambdaCandidate;
224 /**
225 * Switch: allow strings in switch?
226 */
227 boolean allowStringsInSwitch;
229 /**
230 * Switch: name of source level; used for error reporting.
231 */
232 String sourceName;
234 /** Check kind and type of given tree against protokind and prototype.
235 * If check succeeds, store type in tree and return it.
236 * If check fails, store errType in tree and return it.
237 * No checks are performed if the prototype is a method type.
238 * It is not necessary in this case since we know that kind and type
239 * are correct.
240 *
241 * @param tree The tree whose kind and type is checked
242 * @param ownkind The computed kind of the tree
243 * @param resultInfo The expected result of the tree
244 */
245 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
246 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
247 Type owntype = found;
248 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
249 if (allowPoly && inferenceContext.free(found)) {
250 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
251 @Override
252 public void typesInferred(InferenceContext inferenceContext) {
253 ResultInfo pendingResult =
254 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
255 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
256 }
257 });
258 return tree.type = resultInfo.pt;
259 } else {
260 if ((ownkind & ~resultInfo.pkind) == 0) {
261 owntype = resultInfo.check(tree, owntype);
262 } else {
263 log.error(tree.pos(), "unexpected.type",
264 kindNames(resultInfo.pkind),
265 kindName(ownkind));
266 owntype = types.createErrorType(owntype);
267 }
268 }
269 }
270 tree.type = owntype;
271 return owntype;
272 }
274 /** Is given blank final variable assignable, i.e. in a scope where it
275 * may be assigned to even though it is final?
276 * @param v The blank final variable.
277 * @param env The current environment.
278 */
279 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
280 Symbol owner = owner(env);
281 // owner refers to the innermost variable, method or
282 // initializer block declaration at this point.
283 return
284 v.owner == owner
285 ||
286 ((owner.name == names.init || // i.e. we are in a constructor
287 owner.kind == VAR || // i.e. we are in a variable initializer
288 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
289 &&
290 v.owner == owner.owner
291 &&
292 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
293 }
295 /**
296 * Return the innermost enclosing owner symbol in a given attribution context
297 */
298 Symbol owner(Env<AttrContext> env) {
299 while (true) {
300 switch (env.tree.getTag()) {
301 case VARDEF:
302 //a field can be owner
303 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
304 if (vsym.owner.kind == TYP) {
305 return vsym;
306 }
307 break;
308 case METHODDEF:
309 //method def is always an owner
310 return ((JCMethodDecl)env.tree).sym;
311 case CLASSDEF:
312 //class def is always an owner
313 return ((JCClassDecl)env.tree).sym;
314 case LAMBDA:
315 //a lambda is an owner - return a fresh synthetic method symbol
316 return new MethodSymbol(0, names.empty, null, syms.methodClass);
317 case BLOCK:
318 //static/instance init blocks are owner
319 Symbol blockSym = env.info.scope.owner;
320 if ((blockSym.flags() & BLOCK) != 0) {
321 return blockSym;
322 }
323 break;
324 case TOPLEVEL:
325 //toplevel is always an owner (for pkge decls)
326 return env.info.scope.owner;
327 }
328 Assert.checkNonNull(env.next);
329 env = env.next;
330 }
331 }
333 /** Check that variable can be assigned to.
334 * @param pos The current source code position.
335 * @param v The assigned varaible
336 * @param base If the variable is referred to in a Select, the part
337 * to the left of the `.', null otherwise.
338 * @param env The current environment.
339 */
340 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
341 if ((v.flags() & FINAL) != 0 &&
342 ((v.flags() & HASINIT) != 0
343 ||
344 !((base == null ||
345 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
346 isAssignableAsBlankFinal(v, env)))) {
347 if (v.isResourceVariable()) { //TWR resource
348 log.error(pos, "try.resource.may.not.be.assigned", v);
349 } else {
350 log.error(pos, "cant.assign.val.to.final.var", v);
351 }
352 }
353 }
355 /** Does tree represent a static reference to an identifier?
356 * It is assumed that tree is either a SELECT or an IDENT.
357 * We have to weed out selects from non-type names here.
358 * @param tree The candidate tree.
359 */
360 boolean isStaticReference(JCTree tree) {
361 if (tree.hasTag(SELECT)) {
362 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
363 if (lsym == null || lsym.kind != TYP) {
364 return false;
365 }
366 }
367 return true;
368 }
370 /** Is this symbol a type?
371 */
372 static boolean isType(Symbol sym) {
373 return sym != null && sym.kind == TYP;
374 }
376 /** The current `this' symbol.
377 * @param env The current environment.
378 */
379 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
380 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
381 }
383 /** Attribute a parsed identifier.
384 * @param tree Parsed identifier name
385 * @param topLevel The toplevel to use
386 */
387 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
388 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
389 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
390 syms.errSymbol.name,
391 null, null, null, null);
392 localEnv.enclClass.sym = syms.errSymbol;
393 return tree.accept(identAttributer, localEnv);
394 }
395 // where
396 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
397 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
398 @Override
399 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
400 Symbol site = visit(node.getExpression(), env);
401 if (site.kind == ERR || site.kind == ABSENT_TYP)
402 return site;
403 Name name = (Name)node.getIdentifier();
404 if (site.kind == PCK) {
405 env.toplevel.packge = (PackageSymbol)site;
406 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
407 } else {
408 env.enclClass.sym = (ClassSymbol)site;
409 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
410 }
411 }
413 @Override
414 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
415 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
416 }
417 }
419 public Type coerce(Type etype, Type ttype) {
420 return cfolder.coerce(etype, ttype);
421 }
423 public Type attribType(JCTree node, TypeSymbol sym) {
424 Env<AttrContext> env = enter.typeEnvs.get(sym);
425 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
426 return attribTree(node, localEnv, unknownTypeInfo);
427 }
429 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
430 // Attribute qualifying package or class.
431 JCFieldAccess s = (JCFieldAccess)tree.qualid;
432 return attribTree(s.selected,
433 env,
434 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
435 Type.noType));
436 }
438 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
439 breakTree = tree;
440 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
441 try {
442 attribExpr(expr, env);
443 } catch (BreakAttr b) {
444 return b.env;
445 } catch (AssertionError ae) {
446 if (ae.getCause() instanceof BreakAttr) {
447 return ((BreakAttr)(ae.getCause())).env;
448 } else {
449 throw ae;
450 }
451 } finally {
452 breakTree = null;
453 log.useSource(prev);
454 }
455 return env;
456 }
458 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
459 breakTree = tree;
460 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
461 try {
462 attribStat(stmt, env);
463 } catch (BreakAttr b) {
464 return b.env;
465 } catch (AssertionError ae) {
466 if (ae.getCause() instanceof BreakAttr) {
467 return ((BreakAttr)(ae.getCause())).env;
468 } else {
469 throw ae;
470 }
471 } finally {
472 breakTree = null;
473 log.useSource(prev);
474 }
475 return env;
476 }
478 private JCTree breakTree = null;
480 private static class BreakAttr extends RuntimeException {
481 static final long serialVersionUID = -6924771130405446405L;
482 private Env<AttrContext> env;
483 private BreakAttr(Env<AttrContext> env) {
484 this.env = env;
485 }
486 }
488 class ResultInfo {
489 final int pkind;
490 final Type pt;
491 final CheckContext checkContext;
493 ResultInfo(int pkind, Type pt) {
494 this(pkind, pt, chk.basicHandler);
495 }
497 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
498 this.pkind = pkind;
499 this.pt = pt;
500 this.checkContext = checkContext;
501 }
503 protected Type check(final DiagnosticPosition pos, final Type found) {
504 return chk.checkType(pos, found, pt, checkContext);
505 }
507 protected ResultInfo dup(Type newPt) {
508 return new ResultInfo(pkind, newPt, checkContext);
509 }
511 protected ResultInfo dup(CheckContext newContext) {
512 return new ResultInfo(pkind, pt, newContext);
513 }
514 }
516 class RecoveryInfo extends ResultInfo {
518 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
519 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
520 @Override
521 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
522 return deferredAttrContext;
523 }
524 @Override
525 public boolean compatible(Type found, Type req, Warner warn) {
526 return true;
527 }
528 @Override
529 public void report(DiagnosticPosition pos, JCDiagnostic details) {
530 chk.basicHandler.report(pos, details);
531 }
532 });
533 }
534 }
536 final ResultInfo statInfo;
537 final ResultInfo varInfo;
538 final ResultInfo unknownAnyPolyInfo;
539 final ResultInfo unknownExprInfo;
540 final ResultInfo unknownTypeInfo;
541 final ResultInfo unknownTypeExprInfo;
542 final ResultInfo recoveryInfo;
544 Type pt() {
545 return resultInfo.pt;
546 }
548 int pkind() {
549 return resultInfo.pkind;
550 }
552 /* ************************************************************************
553 * Visitor methods
554 *************************************************************************/
556 /** Visitor argument: the current environment.
557 */
558 Env<AttrContext> env;
560 /** Visitor argument: the currently expected attribution result.
561 */
562 ResultInfo resultInfo;
564 /** Visitor result: the computed type.
565 */
566 Type result;
568 /** Visitor method: attribute a tree, catching any completion failure
569 * exceptions. Return the tree's type.
570 *
571 * @param tree The tree to be visited.
572 * @param env The environment visitor argument.
573 * @param resultInfo The result info visitor argument.
574 */
575 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
576 Env<AttrContext> prevEnv = this.env;
577 ResultInfo prevResult = this.resultInfo;
578 try {
579 this.env = env;
580 this.resultInfo = resultInfo;
581 tree.accept(this);
582 if (tree == breakTree &&
583 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
584 throw new BreakAttr(copyEnv(env));
585 }
586 return result;
587 } catch (CompletionFailure ex) {
588 tree.type = syms.errType;
589 return chk.completionError(tree.pos(), ex);
590 } finally {
591 this.env = prevEnv;
592 this.resultInfo = prevResult;
593 }
594 }
596 Env<AttrContext> copyEnv(Env<AttrContext> env) {
597 Env<AttrContext> newEnv =
598 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
599 if (newEnv.outer != null) {
600 newEnv.outer = copyEnv(newEnv.outer);
601 }
602 return newEnv;
603 }
605 Scope copyScope(Scope sc) {
606 Scope newScope = new Scope(sc.owner);
607 List<Symbol> elemsList = List.nil();
608 while (sc != null) {
609 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
610 elemsList = elemsList.prepend(e.sym);
611 }
612 sc = sc.next;
613 }
614 for (Symbol s : elemsList) {
615 newScope.enter(s);
616 }
617 return newScope;
618 }
620 /** Derived visitor method: attribute an expression tree.
621 */
622 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
623 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
624 }
626 /** Derived visitor method: attribute an expression tree with
627 * no constraints on the computed type.
628 */
629 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
630 return attribTree(tree, env, unknownExprInfo);
631 }
633 /** Derived visitor method: attribute a type tree.
634 */
635 public Type attribType(JCTree tree, Env<AttrContext> env) {
636 Type result = attribType(tree, env, Type.noType);
637 return result;
638 }
640 /** Derived visitor method: attribute a type tree.
641 */
642 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
643 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
644 return result;
645 }
647 /** Derived visitor method: attribute a statement or definition tree.
648 */
649 public Type attribStat(JCTree tree, Env<AttrContext> env) {
650 return attribTree(tree, env, statInfo);
651 }
653 /** Attribute a list of expressions, returning a list of types.
654 */
655 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
656 ListBuffer<Type> ts = new ListBuffer<Type>();
657 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
658 ts.append(attribExpr(l.head, env, pt));
659 return ts.toList();
660 }
662 /** Attribute a list of statements, returning nothing.
663 */
664 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
665 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
666 attribStat(l.head, env);
667 }
669 /** Attribute the arguments in a method call, returning the method kind.
670 */
671 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
672 int kind = VAL;
673 for (JCExpression arg : trees) {
674 Type argtype;
675 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
676 argtype = deferredAttr.new DeferredType(arg, env);
677 kind |= POLY;
678 } else {
679 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
680 }
681 argtypes.append(argtype);
682 }
683 return kind;
684 }
686 /** Attribute a type argument list, returning a list of types.
687 * Caller is responsible for calling checkRefTypes.
688 */
689 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
690 ListBuffer<Type> argtypes = new ListBuffer<Type>();
691 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
692 argtypes.append(attribType(l.head, env));
693 return argtypes.toList();
694 }
696 /** Attribute a type argument list, returning a list of types.
697 * Check that all the types are references.
698 */
699 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
700 List<Type> types = attribAnyTypes(trees, env);
701 return chk.checkRefTypes(trees, types);
702 }
704 /**
705 * Attribute type variables (of generic classes or methods).
706 * Compound types are attributed later in attribBounds.
707 * @param typarams the type variables to enter
708 * @param env the current environment
709 */
710 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
711 for (JCTypeParameter tvar : typarams) {
712 TypeVar a = (TypeVar)tvar.type;
713 a.tsym.flags_field |= UNATTRIBUTED;
714 a.bound = Type.noType;
715 if (!tvar.bounds.isEmpty()) {
716 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
717 for (JCExpression bound : tvar.bounds.tail)
718 bounds = bounds.prepend(attribType(bound, env));
719 types.setBounds(a, bounds.reverse());
720 } else {
721 // if no bounds are given, assume a single bound of
722 // java.lang.Object.
723 types.setBounds(a, List.of(syms.objectType));
724 }
725 a.tsym.flags_field &= ~UNATTRIBUTED;
726 }
727 for (JCTypeParameter tvar : typarams) {
728 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
729 }
730 }
732 /**
733 * Attribute the type references in a list of annotations.
734 */
735 void attribAnnotationTypes(List<JCAnnotation> annotations,
736 Env<AttrContext> env) {
737 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
738 JCAnnotation a = al.head;
739 attribType(a.annotationType, env);
740 }
741 }
743 /**
744 * Attribute a "lazy constant value".
745 * @param env The env for the const value
746 * @param initializer The initializer for the const value
747 * @param type The expected type, or null
748 * @see VarSymbol#setLazyConstValue
749 */
750 public Object attribLazyConstantValue(Env<AttrContext> env,
751 JCVariableDecl variable,
752 Type type) {
754 DiagnosticPosition prevLintPos
755 = deferredLintHandler.setPos(variable.pos());
757 try {
758 // Use null as symbol to not attach the type annotation to any symbol.
759 // The initializer will later also be visited and then we'll attach
760 // to the symbol.
761 // This prevents having multiple type annotations, just because of
762 // lazy constant value evaluation.
763 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
764 annotate.flush();
765 Type itype = attribExpr(variable.init, env, type);
766 if (itype.constValue() != null) {
767 return coerce(itype, type).constValue();
768 } else {
769 return null;
770 }
771 } finally {
772 deferredLintHandler.setPos(prevLintPos);
773 }
774 }
776 /** Attribute type reference in an `extends' or `implements' clause.
777 * Supertypes of anonymous inner classes are usually already attributed.
778 *
779 * @param tree The tree making up the type reference.
780 * @param env The environment current at the reference.
781 * @param classExpected true if only a class is expected here.
782 * @param interfaceExpected true if only an interface is expected here.
783 */
784 Type attribBase(JCTree tree,
785 Env<AttrContext> env,
786 boolean classExpected,
787 boolean interfaceExpected,
788 boolean checkExtensible) {
789 Type t = tree.type != null ?
790 tree.type :
791 attribType(tree, env);
792 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
793 }
794 Type checkBase(Type t,
795 JCTree tree,
796 Env<AttrContext> env,
797 boolean classExpected,
798 boolean interfaceExpected,
799 boolean checkExtensible) {
800 if (t.isErroneous())
801 return t;
802 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
803 // check that type variable is already visible
804 if (t.getUpperBound() == null) {
805 log.error(tree.pos(), "illegal.forward.ref");
806 return types.createErrorType(t);
807 }
808 } else {
809 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
810 }
811 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
812 log.error(tree.pos(), "intf.expected.here");
813 // return errType is necessary since otherwise there might
814 // be undetected cycles which cause attribution to loop
815 return types.createErrorType(t);
816 } else if (checkExtensible &&
817 classExpected &&
818 (t.tsym.flags() & INTERFACE) != 0) {
819 log.error(tree.pos(), "no.intf.expected.here");
820 return types.createErrorType(t);
821 }
822 if (checkExtensible &&
823 ((t.tsym.flags() & FINAL) != 0)) {
824 log.error(tree.pos(),
825 "cant.inherit.from.final", t.tsym);
826 }
827 chk.checkNonCyclic(tree.pos(), t);
828 return t;
829 }
831 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
832 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
833 id.type = env.info.scope.owner.type;
834 id.sym = env.info.scope.owner;
835 return id.type;
836 }
838 public void visitClassDef(JCClassDecl tree) {
839 // Local classes have not been entered yet, so we need to do it now:
840 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
841 enter.classEnter(tree, env);
843 ClassSymbol c = tree.sym;
844 if (c == null) {
845 // exit in case something drastic went wrong during enter.
846 result = null;
847 } else {
848 // make sure class has been completed:
849 c.complete();
851 // If this class appears as an anonymous class
852 // in a superclass constructor call where
853 // no explicit outer instance is given,
854 // disable implicit outer instance from being passed.
855 // (This would be an illegal access to "this before super").
856 if (env.info.isSelfCall &&
857 env.tree.hasTag(NEWCLASS) &&
858 ((JCNewClass) env.tree).encl == null)
859 {
860 c.flags_field |= NOOUTERTHIS;
861 }
862 attribClass(tree.pos(), c);
863 result = tree.type = c.type;
864 }
865 }
867 public void visitMethodDef(JCMethodDecl tree) {
868 MethodSymbol m = tree.sym;
869 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
871 Lint lint = env.info.lint.augment(m);
872 Lint prevLint = chk.setLint(lint);
873 MethodSymbol prevMethod = chk.setMethod(m);
874 try {
875 deferredLintHandler.flush(tree.pos());
876 chk.checkDeprecatedAnnotation(tree.pos(), m);
879 // Create a new environment with local scope
880 // for attributing the method.
881 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
882 localEnv.info.lint = lint;
884 attribStats(tree.typarams, localEnv);
886 // If we override any other methods, check that we do so properly.
887 // JLS ???
888 if (m.isStatic()) {
889 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
890 } else {
891 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
892 }
893 chk.checkOverride(tree, m);
895 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
896 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
897 }
899 // Enter all type parameters into the local method scope.
900 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
901 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
903 ClassSymbol owner = env.enclClass.sym;
904 if ((owner.flags() & ANNOTATION) != 0 &&
905 tree.params.nonEmpty())
906 log.error(tree.params.head.pos(),
907 "intf.annotation.members.cant.have.params");
909 // Attribute all value parameters.
910 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
911 attribStat(l.head, localEnv);
912 }
914 chk.checkVarargsMethodDecl(localEnv, tree);
916 // Check that type parameters are well-formed.
917 chk.validate(tree.typarams, localEnv);
919 // Check that result type is well-formed.
920 chk.validate(tree.restype, localEnv);
922 // Check that receiver type is well-formed.
923 if (tree.recvparam != null) {
924 // Use a new environment to check the receiver parameter.
925 // Otherwise I get "might not have been initialized" errors.
926 // Is there a better way?
927 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
928 attribType(tree.recvparam, newEnv);
929 chk.validate(tree.recvparam, newEnv);
930 }
932 // annotation method checks
933 if ((owner.flags() & ANNOTATION) != 0) {
934 // annotation method cannot have throws clause
935 if (tree.thrown.nonEmpty()) {
936 log.error(tree.thrown.head.pos(),
937 "throws.not.allowed.in.intf.annotation");
938 }
939 // annotation method cannot declare type-parameters
940 if (tree.typarams.nonEmpty()) {
941 log.error(tree.typarams.head.pos(),
942 "intf.annotation.members.cant.have.type.params");
943 }
944 // validate annotation method's return type (could be an annotation type)
945 chk.validateAnnotationType(tree.restype);
946 // ensure that annotation method does not clash with members of Object/Annotation
947 chk.validateAnnotationMethod(tree.pos(), m);
949 if (tree.defaultValue != null) {
950 // if default value is an annotation, check it is a well-formed
951 // annotation value (e.g. no duplicate values, no missing values, etc.)
952 chk.validateAnnotationTree(tree.defaultValue);
953 }
954 }
956 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
957 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
959 if (tree.body == null) {
960 // Empty bodies are only allowed for
961 // abstract, native, or interface methods, or for methods
962 // in a retrofit signature class.
963 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
964 !relax)
965 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
966 if (tree.defaultValue != null) {
967 if ((owner.flags() & ANNOTATION) == 0)
968 log.error(tree.pos(),
969 "default.allowed.in.intf.annotation.member");
970 }
971 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
972 if ((owner.flags() & INTERFACE) != 0) {
973 log.error(tree.body.pos(), "intf.meth.cant.have.body");
974 } else {
975 log.error(tree.pos(), "abstract.meth.cant.have.body");
976 }
977 } else if ((tree.mods.flags & NATIVE) != 0) {
978 log.error(tree.pos(), "native.meth.cant.have.body");
979 } else {
980 // Add an implicit super() call unless an explicit call to
981 // super(...) or this(...) is given
982 // or we are compiling class java.lang.Object.
983 if (tree.name == names.init && owner.type != syms.objectType) {
984 JCBlock body = tree.body;
985 if (body.stats.isEmpty() ||
986 !TreeInfo.isSelfCall(body.stats.head)) {
987 body.stats = body.stats.
988 prepend(memberEnter.SuperCall(make.at(body.pos),
989 List.<Type>nil(),
990 List.<JCVariableDecl>nil(),
991 false));
992 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
993 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
994 TreeInfo.isSuperCall(body.stats.head)) {
995 // enum constructors are not allowed to call super
996 // directly, so make sure there aren't any super calls
997 // in enum constructors, except in the compiler
998 // generated one.
999 log.error(tree.body.stats.head.pos(),
1000 "call.to.super.not.allowed.in.enum.ctor",
1001 env.enclClass.sym);
1002 }
1003 }
1005 // Attribute all type annotations in the body
1006 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1007 annotate.flush();
1009 // Attribute method body.
1010 attribStat(tree.body, localEnv);
1011 }
1013 localEnv.info.scope.leave();
1014 result = tree.type = m.type;
1015 chk.validateAnnotations(tree.mods.annotations, m);
1016 }
1017 finally {
1018 chk.setLint(prevLint);
1019 chk.setMethod(prevMethod);
1020 }
1021 }
1023 public void visitVarDef(JCVariableDecl tree) {
1024 // Local variables have not been entered yet, so we need to do it now:
1025 if (env.info.scope.owner.kind == MTH) {
1026 if (tree.sym != null) {
1027 // parameters have already been entered
1028 env.info.scope.enter(tree.sym);
1029 } else {
1030 memberEnter.memberEnter(tree, env);
1031 annotate.flush();
1032 }
1033 } else {
1034 if (tree.init != null) {
1035 // Field initializer expression need to be entered.
1036 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1037 annotate.flush();
1038 }
1039 }
1041 VarSymbol v = tree.sym;
1042 Lint lint = env.info.lint.augment(v);
1043 Lint prevLint = chk.setLint(lint);
1045 // Check that the variable's declared type is well-formed.
1046 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1047 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1048 (tree.sym.flags() & PARAMETER) != 0;
1049 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1051 try {
1052 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1053 deferredLintHandler.flush(tree.pos());
1054 chk.checkDeprecatedAnnotation(tree.pos(), v);
1056 if (tree.init != null) {
1057 if ((v.flags_field & FINAL) == 0 ||
1058 !memberEnter.needsLazyConstValue(tree.init)) {
1059 // Not a compile-time constant
1060 // Attribute initializer in a new environment
1061 // with the declared variable as owner.
1062 // Check that initializer conforms to variable's declared type.
1063 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1064 initEnv.info.lint = lint;
1065 // In order to catch self-references, we set the variable's
1066 // declaration position to maximal possible value, effectively
1067 // marking the variable as undefined.
1068 initEnv.info.enclVar = v;
1069 attribExpr(tree.init, initEnv, v.type);
1070 }
1071 }
1072 result = tree.type = v.type;
1073 chk.validateAnnotations(tree.mods.annotations, v);
1074 }
1075 finally {
1076 chk.setLint(prevLint);
1077 }
1078 }
1080 public void visitSkip(JCSkip tree) {
1081 result = null;
1082 }
1084 public void visitBlock(JCBlock tree) {
1085 if (env.info.scope.owner.kind == TYP) {
1086 // Block is a static or instance initializer;
1087 // let the owner of the environment be a freshly
1088 // created BLOCK-method.
1089 Env<AttrContext> localEnv =
1090 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1091 localEnv.info.scope.owner =
1092 new MethodSymbol(tree.flags | BLOCK |
1093 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1094 env.info.scope.owner);
1095 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1097 // Attribute all type annotations in the block
1098 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1099 annotate.flush();
1101 {
1102 // Store init and clinit type annotations with the ClassSymbol
1103 // to allow output in Gen.normalizeDefs.
1104 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1105 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1106 if ((tree.flags & STATIC) != 0) {
1107 cs.appendClassInitTypeAttributes(tas);
1108 } else {
1109 cs.appendInitTypeAttributes(tas);
1110 }
1111 }
1113 attribStats(tree.stats, localEnv);
1114 } else {
1115 // Create a new local environment with a local scope.
1116 Env<AttrContext> localEnv =
1117 env.dup(tree, env.info.dup(env.info.scope.dup()));
1118 try {
1119 attribStats(tree.stats, localEnv);
1120 } finally {
1121 localEnv.info.scope.leave();
1122 }
1123 }
1124 result = null;
1125 }
1127 public void visitDoLoop(JCDoWhileLoop tree) {
1128 attribStat(tree.body, env.dup(tree));
1129 attribExpr(tree.cond, env, syms.booleanType);
1130 result = null;
1131 }
1133 public void visitWhileLoop(JCWhileLoop tree) {
1134 attribExpr(tree.cond, env, syms.booleanType);
1135 attribStat(tree.body, env.dup(tree));
1136 result = null;
1137 }
1139 public void visitForLoop(JCForLoop tree) {
1140 Env<AttrContext> loopEnv =
1141 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1142 try {
1143 attribStats(tree.init, loopEnv);
1144 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1145 loopEnv.tree = tree; // before, we were not in loop!
1146 attribStats(tree.step, loopEnv);
1147 attribStat(tree.body, loopEnv);
1148 result = null;
1149 }
1150 finally {
1151 loopEnv.info.scope.leave();
1152 }
1153 }
1155 public void visitForeachLoop(JCEnhancedForLoop tree) {
1156 Env<AttrContext> loopEnv =
1157 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1158 try {
1159 //the Formal Parameter of a for-each loop is not in the scope when
1160 //attributing the for-each expression; we mimick this by attributing
1161 //the for-each expression first (against original scope).
1162 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1163 attribStat(tree.var, loopEnv);
1164 chk.checkNonVoid(tree.pos(), exprType);
1165 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1166 if (elemtype == null) {
1167 // or perhaps expr implements Iterable<T>?
1168 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1169 if (base == null) {
1170 log.error(tree.expr.pos(),
1171 "foreach.not.applicable.to.type",
1172 exprType,
1173 diags.fragment("type.req.array.or.iterable"));
1174 elemtype = types.createErrorType(exprType);
1175 } else {
1176 List<Type> iterableParams = base.allparams();
1177 elemtype = iterableParams.isEmpty()
1178 ? syms.objectType
1179 : types.upperBound(iterableParams.head);
1180 }
1181 }
1182 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1183 loopEnv.tree = tree; // before, we were not in loop!
1184 attribStat(tree.body, loopEnv);
1185 result = null;
1186 }
1187 finally {
1188 loopEnv.info.scope.leave();
1189 }
1190 }
1192 public void visitLabelled(JCLabeledStatement tree) {
1193 // Check that label is not used in an enclosing statement
1194 Env<AttrContext> env1 = env;
1195 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1196 if (env1.tree.hasTag(LABELLED) &&
1197 ((JCLabeledStatement) env1.tree).label == tree.label) {
1198 log.error(tree.pos(), "label.already.in.use",
1199 tree.label);
1200 break;
1201 }
1202 env1 = env1.next;
1203 }
1205 attribStat(tree.body, env.dup(tree));
1206 result = null;
1207 }
1209 public void visitSwitch(JCSwitch tree) {
1210 Type seltype = attribExpr(tree.selector, env);
1212 Env<AttrContext> switchEnv =
1213 env.dup(tree, env.info.dup(env.info.scope.dup()));
1215 try {
1217 boolean enumSwitch =
1218 allowEnums &&
1219 (seltype.tsym.flags() & Flags.ENUM) != 0;
1220 boolean stringSwitch = false;
1221 if (types.isSameType(seltype, syms.stringType)) {
1222 if (allowStringsInSwitch) {
1223 stringSwitch = true;
1224 } else {
1225 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1226 }
1227 }
1228 if (!enumSwitch && !stringSwitch)
1229 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1231 // Attribute all cases and
1232 // check that there are no duplicate case labels or default clauses.
1233 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1234 boolean hasDefault = false; // Is there a default label?
1235 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1236 JCCase c = l.head;
1237 Env<AttrContext> caseEnv =
1238 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1239 try {
1240 if (c.pat != null) {
1241 if (enumSwitch) {
1242 Symbol sym = enumConstant(c.pat, seltype);
1243 if (sym == null) {
1244 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1245 } else if (!labels.add(sym)) {
1246 log.error(c.pos(), "duplicate.case.label");
1247 }
1248 } else {
1249 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1250 if (!pattype.hasTag(ERROR)) {
1251 if (pattype.constValue() == null) {
1252 log.error(c.pat.pos(),
1253 (stringSwitch ? "string.const.req" : "const.expr.req"));
1254 } else if (labels.contains(pattype.constValue())) {
1255 log.error(c.pos(), "duplicate.case.label");
1256 } else {
1257 labels.add(pattype.constValue());
1258 }
1259 }
1260 }
1261 } else if (hasDefault) {
1262 log.error(c.pos(), "duplicate.default.label");
1263 } else {
1264 hasDefault = true;
1265 }
1266 attribStats(c.stats, caseEnv);
1267 } finally {
1268 caseEnv.info.scope.leave();
1269 addVars(c.stats, switchEnv.info.scope);
1270 }
1271 }
1273 result = null;
1274 }
1275 finally {
1276 switchEnv.info.scope.leave();
1277 }
1278 }
1279 // where
1280 /** Add any variables defined in stats to the switch scope. */
1281 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1282 for (;stats.nonEmpty(); stats = stats.tail) {
1283 JCTree stat = stats.head;
1284 if (stat.hasTag(VARDEF))
1285 switchScope.enter(((JCVariableDecl) stat).sym);
1286 }
1287 }
1288 // where
1289 /** Return the selected enumeration constant symbol, or null. */
1290 private Symbol enumConstant(JCTree tree, Type enumType) {
1291 if (!tree.hasTag(IDENT)) {
1292 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1293 return syms.errSymbol;
1294 }
1295 JCIdent ident = (JCIdent)tree;
1296 Name name = ident.name;
1297 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1298 e.scope != null; e = e.next()) {
1299 if (e.sym.kind == VAR) {
1300 Symbol s = ident.sym = e.sym;
1301 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1302 ident.type = s.type;
1303 return ((s.flags_field & Flags.ENUM) == 0)
1304 ? null : s;
1305 }
1306 }
1307 return null;
1308 }
1310 public void visitSynchronized(JCSynchronized tree) {
1311 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1312 attribStat(tree.body, env);
1313 result = null;
1314 }
1316 public void visitTry(JCTry tree) {
1317 // Create a new local environment with a local
1318 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1319 try {
1320 boolean isTryWithResource = tree.resources.nonEmpty();
1321 // Create a nested environment for attributing the try block if needed
1322 Env<AttrContext> tryEnv = isTryWithResource ?
1323 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1324 localEnv;
1325 try {
1326 // Attribute resource declarations
1327 for (JCTree resource : tree.resources) {
1328 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1329 @Override
1330 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1331 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1332 }
1333 };
1334 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1335 if (resource.hasTag(VARDEF)) {
1336 attribStat(resource, tryEnv);
1337 twrResult.check(resource, resource.type);
1339 //check that resource type cannot throw InterruptedException
1340 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1342 VarSymbol var = ((JCVariableDecl) resource).sym;
1343 var.setData(ElementKind.RESOURCE_VARIABLE);
1344 } else {
1345 attribTree(resource, tryEnv, twrResult);
1346 }
1347 }
1348 // Attribute body
1349 attribStat(tree.body, tryEnv);
1350 } finally {
1351 if (isTryWithResource)
1352 tryEnv.info.scope.leave();
1353 }
1355 // Attribute catch clauses
1356 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1357 JCCatch c = l.head;
1358 Env<AttrContext> catchEnv =
1359 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1360 try {
1361 Type ctype = attribStat(c.param, catchEnv);
1362 if (TreeInfo.isMultiCatch(c)) {
1363 //multi-catch parameter is implicitly marked as final
1364 c.param.sym.flags_field |= FINAL | UNION;
1365 }
1366 if (c.param.sym.kind == Kinds.VAR) {
1367 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1368 }
1369 chk.checkType(c.param.vartype.pos(),
1370 chk.checkClassType(c.param.vartype.pos(), ctype),
1371 syms.throwableType);
1372 attribStat(c.body, catchEnv);
1373 } finally {
1374 catchEnv.info.scope.leave();
1375 }
1376 }
1378 // Attribute finalizer
1379 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1380 result = null;
1381 }
1382 finally {
1383 localEnv.info.scope.leave();
1384 }
1385 }
1387 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1388 if (!resource.isErroneous() &&
1389 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1390 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1391 Symbol close = syms.noSymbol;
1392 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1393 try {
1394 close = rs.resolveQualifiedMethod(pos,
1395 env,
1396 resource,
1397 names.close,
1398 List.<Type>nil(),
1399 List.<Type>nil());
1400 }
1401 finally {
1402 log.popDiagnosticHandler(discardHandler);
1403 }
1404 if (close.kind == MTH &&
1405 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1406 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1407 env.info.lint.isEnabled(LintCategory.TRY)) {
1408 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1409 }
1410 }
1411 }
1413 public void visitConditional(JCConditional tree) {
1414 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1416 tree.polyKind = (!allowPoly ||
1417 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1418 isBooleanOrNumeric(env, tree)) ?
1419 PolyKind.STANDALONE : PolyKind.POLY;
1421 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1422 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1423 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1424 result = tree.type = types.createErrorType(resultInfo.pt);
1425 return;
1426 }
1428 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1429 unknownExprInfo :
1430 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1431 //this will use enclosing check context to check compatibility of
1432 //subexpression against target type; if we are in a method check context,
1433 //depending on whether boxing is allowed, we could have incompatibilities
1434 @Override
1435 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1436 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1437 }
1438 });
1440 Type truetype = attribTree(tree.truepart, env, condInfo);
1441 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1443 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1444 if (condtype.constValue() != null &&
1445 truetype.constValue() != null &&
1446 falsetype.constValue() != null &&
1447 !owntype.hasTag(NONE)) {
1448 //constant folding
1449 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1450 }
1451 result = check(tree, owntype, VAL, resultInfo);
1452 }
1453 //where
1454 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1455 switch (tree.getTag()) {
1456 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1457 ((JCLiteral)tree).typetag == BOOLEAN ||
1458 ((JCLiteral)tree).typetag == BOT;
1459 case LAMBDA: case REFERENCE: return false;
1460 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1461 case CONDEXPR:
1462 JCConditional condTree = (JCConditional)tree;
1463 return isBooleanOrNumeric(env, condTree.truepart) &&
1464 isBooleanOrNumeric(env, condTree.falsepart);
1465 case APPLY:
1466 JCMethodInvocation speculativeMethodTree =
1467 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1468 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1469 return types.unboxedTypeOrType(owntype).isPrimitive();
1470 case NEWCLASS:
1471 JCExpression className =
1472 removeClassParams.translate(((JCNewClass)tree).clazz);
1473 JCExpression speculativeNewClassTree =
1474 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1475 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1476 default:
1477 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1478 speculativeType = types.unboxedTypeOrType(speculativeType);
1479 return speculativeType.isPrimitive();
1480 }
1481 }
1482 //where
1483 TreeTranslator removeClassParams = new TreeTranslator() {
1484 @Override
1485 public void visitTypeApply(JCTypeApply tree) {
1486 result = translate(tree.clazz);
1487 }
1488 };
1490 /** Compute the type of a conditional expression, after
1491 * checking that it exists. See JLS 15.25. Does not take into
1492 * account the special case where condition and both arms
1493 * are constants.
1494 *
1495 * @param pos The source position to be used for error
1496 * diagnostics.
1497 * @param thentype The type of the expression's then-part.
1498 * @param elsetype The type of the expression's else-part.
1499 */
1500 private Type condType(DiagnosticPosition pos,
1501 Type thentype, Type elsetype) {
1502 // If same type, that is the result
1503 if (types.isSameType(thentype, elsetype))
1504 return thentype.baseType();
1506 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1507 ? thentype : types.unboxedType(thentype);
1508 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1509 ? elsetype : types.unboxedType(elsetype);
1511 // Otherwise, if both arms can be converted to a numeric
1512 // type, return the least numeric type that fits both arms
1513 // (i.e. return larger of the two, or return int if one
1514 // arm is short, the other is char).
1515 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1516 // If one arm has an integer subrange type (i.e., byte,
1517 // short, or char), and the other is an integer constant
1518 // that fits into the subrange, return the subrange type.
1519 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1520 elseUnboxed.hasTag(INT) &&
1521 types.isAssignable(elseUnboxed, thenUnboxed)) {
1522 return thenUnboxed.baseType();
1523 }
1524 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1525 thenUnboxed.hasTag(INT) &&
1526 types.isAssignable(thenUnboxed, elseUnboxed)) {
1527 return elseUnboxed.baseType();
1528 }
1530 for (TypeTag tag : primitiveTags) {
1531 Type candidate = syms.typeOfTag[tag.ordinal()];
1532 if (types.isSubtype(thenUnboxed, candidate) &&
1533 types.isSubtype(elseUnboxed, candidate)) {
1534 return candidate;
1535 }
1536 }
1537 }
1539 // Those were all the cases that could result in a primitive
1540 if (allowBoxing) {
1541 if (thentype.isPrimitive())
1542 thentype = types.boxedClass(thentype).type;
1543 if (elsetype.isPrimitive())
1544 elsetype = types.boxedClass(elsetype).type;
1545 }
1547 if (types.isSubtype(thentype, elsetype))
1548 return elsetype.baseType();
1549 if (types.isSubtype(elsetype, thentype))
1550 return thentype.baseType();
1552 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1553 log.error(pos, "neither.conditional.subtype",
1554 thentype, elsetype);
1555 return thentype.baseType();
1556 }
1558 // both are known to be reference types. The result is
1559 // lub(thentype,elsetype). This cannot fail, as it will
1560 // always be possible to infer "Object" if nothing better.
1561 return types.lub(thentype.baseType(), elsetype.baseType());
1562 }
1564 final static TypeTag[] primitiveTags = new TypeTag[]{
1565 BYTE,
1566 CHAR,
1567 SHORT,
1568 INT,
1569 LONG,
1570 FLOAT,
1571 DOUBLE,
1572 BOOLEAN,
1573 };
1575 public void visitIf(JCIf tree) {
1576 attribExpr(tree.cond, env, syms.booleanType);
1577 attribStat(tree.thenpart, env);
1578 if (tree.elsepart != null)
1579 attribStat(tree.elsepart, env);
1580 chk.checkEmptyIf(tree);
1581 result = null;
1582 }
1584 public void visitExec(JCExpressionStatement tree) {
1585 //a fresh environment is required for 292 inference to work properly ---
1586 //see Infer.instantiatePolymorphicSignatureInstance()
1587 Env<AttrContext> localEnv = env.dup(tree);
1588 attribExpr(tree.expr, localEnv);
1589 result = null;
1590 }
1592 public void visitBreak(JCBreak tree) {
1593 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1594 result = null;
1595 }
1597 public void visitContinue(JCContinue tree) {
1598 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1599 result = null;
1600 }
1601 //where
1602 /** Return the target of a break or continue statement, if it exists,
1603 * report an error if not.
1604 * Note: The target of a labelled break or continue is the
1605 * (non-labelled) statement tree referred to by the label,
1606 * not the tree representing the labelled statement itself.
1607 *
1608 * @param pos The position to be used for error diagnostics
1609 * @param tag The tag of the jump statement. This is either
1610 * Tree.BREAK or Tree.CONTINUE.
1611 * @param label The label of the jump statement, or null if no
1612 * label is given.
1613 * @param env The environment current at the jump statement.
1614 */
1615 private JCTree findJumpTarget(DiagnosticPosition pos,
1616 JCTree.Tag tag,
1617 Name label,
1618 Env<AttrContext> env) {
1619 // Search environments outwards from the point of jump.
1620 Env<AttrContext> env1 = env;
1621 LOOP:
1622 while (env1 != null) {
1623 switch (env1.tree.getTag()) {
1624 case LABELLED:
1625 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1626 if (label == labelled.label) {
1627 // If jump is a continue, check that target is a loop.
1628 if (tag == CONTINUE) {
1629 if (!labelled.body.hasTag(DOLOOP) &&
1630 !labelled.body.hasTag(WHILELOOP) &&
1631 !labelled.body.hasTag(FORLOOP) &&
1632 !labelled.body.hasTag(FOREACHLOOP))
1633 log.error(pos, "not.loop.label", label);
1634 // Found labelled statement target, now go inwards
1635 // to next non-labelled tree.
1636 return TreeInfo.referencedStatement(labelled);
1637 } else {
1638 return labelled;
1639 }
1640 }
1641 break;
1642 case DOLOOP:
1643 case WHILELOOP:
1644 case FORLOOP:
1645 case FOREACHLOOP:
1646 if (label == null) return env1.tree;
1647 break;
1648 case SWITCH:
1649 if (label == null && tag == BREAK) return env1.tree;
1650 break;
1651 case LAMBDA:
1652 case METHODDEF:
1653 case CLASSDEF:
1654 break LOOP;
1655 default:
1656 }
1657 env1 = env1.next;
1658 }
1659 if (label != null)
1660 log.error(pos, "undef.label", label);
1661 else if (tag == CONTINUE)
1662 log.error(pos, "cont.outside.loop");
1663 else
1664 log.error(pos, "break.outside.switch.loop");
1665 return null;
1666 }
1668 public void visitReturn(JCReturn tree) {
1669 // Check that there is an enclosing method which is
1670 // nested within than the enclosing class.
1671 if (env.info.returnResult == null) {
1672 log.error(tree.pos(), "ret.outside.meth");
1673 } else {
1674 // Attribute return expression, if it exists, and check that
1675 // it conforms to result type of enclosing method.
1676 if (tree.expr != null) {
1677 if (env.info.returnResult.pt.hasTag(VOID)) {
1678 env.info.returnResult.checkContext.report(tree.expr.pos(),
1679 diags.fragment("unexpected.ret.val"));
1680 }
1681 attribTree(tree.expr, env, env.info.returnResult);
1682 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1683 !env.info.returnResult.pt.hasTag(NONE)) {
1684 env.info.returnResult.checkContext.report(tree.pos(),
1685 diags.fragment("missing.ret.val"));
1686 }
1687 }
1688 result = null;
1689 }
1691 public void visitThrow(JCThrow tree) {
1692 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1693 if (allowPoly) {
1694 chk.checkType(tree, owntype, syms.throwableType);
1695 }
1696 result = null;
1697 }
1699 public void visitAssert(JCAssert tree) {
1700 attribExpr(tree.cond, env, syms.booleanType);
1701 if (tree.detail != null) {
1702 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1703 }
1704 result = null;
1705 }
1707 /** Visitor method for method invocations.
1708 * NOTE: The method part of an application will have in its type field
1709 * the return type of the method, not the method's type itself!
1710 */
1711 public void visitApply(JCMethodInvocation tree) {
1712 // The local environment of a method application is
1713 // a new environment nested in the current one.
1714 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1716 // The types of the actual method arguments.
1717 List<Type> argtypes;
1719 // The types of the actual method type arguments.
1720 List<Type> typeargtypes = null;
1722 Name methName = TreeInfo.name(tree.meth);
1724 boolean isConstructorCall =
1725 methName == names._this || methName == names._super;
1727 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1728 if (isConstructorCall) {
1729 // We are seeing a ...this(...) or ...super(...) call.
1730 // Check that this is the first statement in a constructor.
1731 if (checkFirstConstructorStat(tree, env)) {
1733 // Record the fact
1734 // that this is a constructor call (using isSelfCall).
1735 localEnv.info.isSelfCall = true;
1737 // Attribute arguments, yielding list of argument types.
1738 attribArgs(tree.args, localEnv, argtypesBuf);
1739 argtypes = argtypesBuf.toList();
1740 typeargtypes = attribTypes(tree.typeargs, localEnv);
1742 // Variable `site' points to the class in which the called
1743 // constructor is defined.
1744 Type site = env.enclClass.sym.type;
1745 if (methName == names._super) {
1746 if (site == syms.objectType) {
1747 log.error(tree.meth.pos(), "no.superclass", site);
1748 site = types.createErrorType(syms.objectType);
1749 } else {
1750 site = types.supertype(site);
1751 }
1752 }
1754 if (site.hasTag(CLASS)) {
1755 Type encl = site.getEnclosingType();
1756 while (encl != null && encl.hasTag(TYPEVAR))
1757 encl = encl.getUpperBound();
1758 if (encl.hasTag(CLASS)) {
1759 // we are calling a nested class
1761 if (tree.meth.hasTag(SELECT)) {
1762 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1764 // We are seeing a prefixed call, of the form
1765 // <expr>.super(...).
1766 // Check that the prefix expression conforms
1767 // to the outer instance type of the class.
1768 chk.checkRefType(qualifier.pos(),
1769 attribExpr(qualifier, localEnv,
1770 encl));
1771 } else if (methName == names._super) {
1772 // qualifier omitted; check for existence
1773 // of an appropriate implicit qualifier.
1774 rs.resolveImplicitThis(tree.meth.pos(),
1775 localEnv, site, true);
1776 }
1777 } else if (tree.meth.hasTag(SELECT)) {
1778 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1779 site.tsym);
1780 }
1782 // if we're calling a java.lang.Enum constructor,
1783 // prefix the implicit String and int parameters
1784 if (site.tsym == syms.enumSym && allowEnums)
1785 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1787 // Resolve the called constructor under the assumption
1788 // that we are referring to a superclass instance of the
1789 // current instance (JLS ???).
1790 boolean selectSuperPrev = localEnv.info.selectSuper;
1791 localEnv.info.selectSuper = true;
1792 localEnv.info.pendingResolutionPhase = null;
1793 Symbol sym = rs.resolveConstructor(
1794 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1795 localEnv.info.selectSuper = selectSuperPrev;
1797 // Set method symbol to resolved constructor...
1798 TreeInfo.setSymbol(tree.meth, sym);
1800 // ...and check that it is legal in the current context.
1801 // (this will also set the tree's type)
1802 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1803 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1804 }
1805 // Otherwise, `site' is an error type and we do nothing
1806 }
1807 result = tree.type = syms.voidType;
1808 } else {
1809 // Otherwise, we are seeing a regular method call.
1810 // Attribute the arguments, yielding list of argument types, ...
1811 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1812 argtypes = argtypesBuf.toList();
1813 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1815 // ... and attribute the method using as a prototype a methodtype
1816 // whose formal argument types is exactly the list of actual
1817 // arguments (this will also set the method symbol).
1818 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1819 localEnv.info.pendingResolutionPhase = null;
1820 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1822 // Compute the result type.
1823 Type restype = mtype.getReturnType();
1824 if (restype.hasTag(WILDCARD))
1825 throw new AssertionError(mtype);
1827 Type qualifier = (tree.meth.hasTag(SELECT))
1828 ? ((JCFieldAccess) tree.meth).selected.type
1829 : env.enclClass.sym.type;
1830 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1832 chk.checkRefTypes(tree.typeargs, typeargtypes);
1834 // Check that value of resulting type is admissible in the
1835 // current context. Also, capture the return type
1836 result = check(tree, capture(restype), VAL, resultInfo);
1837 }
1838 chk.validate(tree.typeargs, localEnv);
1839 }
1840 //where
1841 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1842 if (allowCovariantReturns &&
1843 methodName == names.clone &&
1844 types.isArray(qualifierType)) {
1845 // as a special case, array.clone() has a result that is
1846 // the same as static type of the array being cloned
1847 return qualifierType;
1848 } else if (allowGenerics &&
1849 methodName == names.getClass &&
1850 argtypes.isEmpty()) {
1851 // as a special case, x.getClass() has type Class<? extends |X|>
1852 return new ClassType(restype.getEnclosingType(),
1853 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1854 BoundKind.EXTENDS,
1855 syms.boundClass)),
1856 restype.tsym);
1857 } else {
1858 return restype;
1859 }
1860 }
1862 /** Check that given application node appears as first statement
1863 * in a constructor call.
1864 * @param tree The application node
1865 * @param env The environment current at the application.
1866 */
1867 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1868 JCMethodDecl enclMethod = env.enclMethod;
1869 if (enclMethod != null && enclMethod.name == names.init) {
1870 JCBlock body = enclMethod.body;
1871 if (body.stats.head.hasTag(EXEC) &&
1872 ((JCExpressionStatement) body.stats.head).expr == tree)
1873 return true;
1874 }
1875 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1876 TreeInfo.name(tree.meth));
1877 return false;
1878 }
1880 /** Obtain a method type with given argument types.
1881 */
1882 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1883 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1884 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1885 }
1887 public void visitNewClass(final JCNewClass tree) {
1888 Type owntype = types.createErrorType(tree.type);
1890 // The local environment of a class creation is
1891 // a new environment nested in the current one.
1892 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1894 // The anonymous inner class definition of the new expression,
1895 // if one is defined by it.
1896 JCClassDecl cdef = tree.def;
1898 // If enclosing class is given, attribute it, and
1899 // complete class name to be fully qualified
1900 JCExpression clazz = tree.clazz; // Class field following new
1901 JCExpression clazzid; // Identifier in class field
1902 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1903 annoclazzid = null;
1905 if (clazz.hasTag(TYPEAPPLY)) {
1906 clazzid = ((JCTypeApply) clazz).clazz;
1907 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1908 annoclazzid = (JCAnnotatedType) clazzid;
1909 clazzid = annoclazzid.underlyingType;
1910 }
1911 } else {
1912 if (clazz.hasTag(ANNOTATED_TYPE)) {
1913 annoclazzid = (JCAnnotatedType) clazz;
1914 clazzid = annoclazzid.underlyingType;
1915 } else {
1916 clazzid = clazz;
1917 }
1918 }
1920 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1922 if (tree.encl != null) {
1923 // We are seeing a qualified new, of the form
1924 // <expr>.new C <...> (...) ...
1925 // In this case, we let clazz stand for the name of the
1926 // allocated class C prefixed with the type of the qualifier
1927 // expression, so that we can
1928 // resolve it with standard techniques later. I.e., if
1929 // <expr> has type T, then <expr>.new C <...> (...)
1930 // yields a clazz T.C.
1931 Type encltype = chk.checkRefType(tree.encl.pos(),
1932 attribExpr(tree.encl, env));
1933 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1934 // from expr to the combined type, or not? Yes, do this.
1935 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1936 ((JCIdent) clazzid).name);
1938 EndPosTable endPosTable = this.env.toplevel.endPositions;
1939 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1940 if (clazz.hasTag(ANNOTATED_TYPE)) {
1941 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1942 List<JCAnnotation> annos = annoType.annotations;
1944 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1945 clazzid1 = make.at(tree.pos).
1946 TypeApply(clazzid1,
1947 ((JCTypeApply) clazz).arguments);
1948 }
1950 clazzid1 = make.at(tree.pos).
1951 AnnotatedType(annos, clazzid1);
1952 } else if (clazz.hasTag(TYPEAPPLY)) {
1953 clazzid1 = make.at(tree.pos).
1954 TypeApply(clazzid1,
1955 ((JCTypeApply) clazz).arguments);
1956 }
1958 clazz = clazzid1;
1959 }
1961 // Attribute clazz expression and store
1962 // symbol + type back into the attributed tree.
1963 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1964 attribIdentAsEnumType(env, (JCIdent)clazz) :
1965 attribType(clazz, env);
1967 clazztype = chk.checkDiamond(tree, clazztype);
1968 chk.validate(clazz, localEnv);
1969 if (tree.encl != null) {
1970 // We have to work in this case to store
1971 // symbol + type back into the attributed tree.
1972 tree.clazz.type = clazztype;
1973 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1974 clazzid.type = ((JCIdent) clazzid).sym.type;
1975 if (annoclazzid != null) {
1976 annoclazzid.type = clazzid.type;
1977 }
1978 if (!clazztype.isErroneous()) {
1979 if (cdef != null && clazztype.tsym.isInterface()) {
1980 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1981 } else if (clazztype.tsym.isStatic()) {
1982 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1983 }
1984 }
1985 } else if (!clazztype.tsym.isInterface() &&
1986 clazztype.getEnclosingType().hasTag(CLASS)) {
1987 // Check for the existence of an apropos outer instance
1988 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1989 }
1991 // Attribute constructor arguments.
1992 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1993 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
1994 List<Type> argtypes = argtypesBuf.toList();
1995 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1997 // If we have made no mistakes in the class type...
1998 if (clazztype.hasTag(CLASS)) {
1999 // Enums may not be instantiated except implicitly
2000 if (allowEnums &&
2001 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2002 (!env.tree.hasTag(VARDEF) ||
2003 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2004 ((JCVariableDecl) env.tree).init != tree))
2005 log.error(tree.pos(), "enum.cant.be.instantiated");
2006 // Check that class is not abstract
2007 if (cdef == null &&
2008 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2009 log.error(tree.pos(), "abstract.cant.be.instantiated",
2010 clazztype.tsym);
2011 } else if (cdef != null && clazztype.tsym.isInterface()) {
2012 // Check that no constructor arguments are given to
2013 // anonymous classes implementing an interface
2014 if (!argtypes.isEmpty())
2015 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2017 if (!typeargtypes.isEmpty())
2018 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2020 // Error recovery: pretend no arguments were supplied.
2021 argtypes = List.nil();
2022 typeargtypes = List.nil();
2023 } else if (TreeInfo.isDiamond(tree)) {
2024 ClassType site = new ClassType(clazztype.getEnclosingType(),
2025 clazztype.tsym.type.getTypeArguments(),
2026 clazztype.tsym);
2028 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2029 diamondEnv.info.selectSuper = cdef != null;
2030 diamondEnv.info.pendingResolutionPhase = null;
2032 //if the type of the instance creation expression is a class type
2033 //apply method resolution inference (JLS 15.12.2.7). The return type
2034 //of the resolved constructor will be a partially instantiated type
2035 Symbol constructor = rs.resolveDiamond(tree.pos(),
2036 diamondEnv,
2037 site,
2038 argtypes,
2039 typeargtypes);
2040 tree.constructor = constructor.baseSymbol();
2042 final TypeSymbol csym = clazztype.tsym;
2043 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2044 @Override
2045 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2046 enclosingContext.report(tree.clazz,
2047 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2048 }
2049 });
2050 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2051 constructorType = checkId(tree, site,
2052 constructor,
2053 diamondEnv,
2054 diamondResult);
2056 tree.clazz.type = types.createErrorType(clazztype);
2057 if (!constructorType.isErroneous()) {
2058 tree.clazz.type = clazztype = constructorType.getReturnType();
2059 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2060 }
2061 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2062 }
2064 // Resolve the called constructor under the assumption
2065 // that we are referring to a superclass instance of the
2066 // current instance (JLS ???).
2067 else {
2068 //the following code alters some of the fields in the current
2069 //AttrContext - hence, the current context must be dup'ed in
2070 //order to avoid downstream failures
2071 Env<AttrContext> rsEnv = localEnv.dup(tree);
2072 rsEnv.info.selectSuper = cdef != null;
2073 rsEnv.info.pendingResolutionPhase = null;
2074 tree.constructor = rs.resolveConstructor(
2075 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2076 if (cdef == null) { //do not check twice!
2077 tree.constructorType = checkId(tree,
2078 clazztype,
2079 tree.constructor,
2080 rsEnv,
2081 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2082 if (rsEnv.info.lastResolveVarargs())
2083 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2084 }
2085 if (cdef == null &&
2086 !clazztype.isErroneous() &&
2087 clazztype.getTypeArguments().nonEmpty() &&
2088 findDiamonds) {
2089 findDiamond(localEnv, tree, clazztype);
2090 }
2091 }
2093 if (cdef != null) {
2094 // We are seeing an anonymous class instance creation.
2095 // In this case, the class instance creation
2096 // expression
2097 //
2098 // E.new <typeargs1>C<typargs2>(args) { ... }
2099 //
2100 // is represented internally as
2101 //
2102 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2103 //
2104 // This expression is then *transformed* as follows:
2105 //
2106 // (1) add a STATIC flag to the class definition
2107 // if the current environment is static
2108 // (2) add an extends or implements clause
2109 // (3) add a constructor.
2110 //
2111 // For instance, if C is a class, and ET is the type of E,
2112 // the expression
2113 //
2114 // E.new <typeargs1>C<typargs2>(args) { ... }
2115 //
2116 // is translated to (where X is a fresh name and typarams is the
2117 // parameter list of the super constructor):
2118 //
2119 // new <typeargs1>X(<*nullchk*>E, args) where
2120 // X extends C<typargs2> {
2121 // <typarams> X(ET e, args) {
2122 // e.<typeargs1>super(args)
2123 // }
2124 // ...
2125 // }
2126 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2128 if (clazztype.tsym.isInterface()) {
2129 cdef.implementing = List.of(clazz);
2130 } else {
2131 cdef.extending = clazz;
2132 }
2134 attribStat(cdef, localEnv);
2136 checkLambdaCandidate(tree, cdef.sym, clazztype);
2138 // If an outer instance is given,
2139 // prefix it to the constructor arguments
2140 // and delete it from the new expression
2141 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2142 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2143 argtypes = argtypes.prepend(tree.encl.type);
2144 tree.encl = null;
2145 }
2147 // Reassign clazztype and recompute constructor.
2148 clazztype = cdef.sym.type;
2149 Symbol sym = tree.constructor = rs.resolveConstructor(
2150 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2151 Assert.check(sym.kind < AMBIGUOUS);
2152 tree.constructor = sym;
2153 tree.constructorType = checkId(tree,
2154 clazztype,
2155 tree.constructor,
2156 localEnv,
2157 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2158 } else {
2159 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2160 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2161 tree.clazz.type.tsym);
2162 }
2163 }
2165 if (tree.constructor != null && tree.constructor.kind == MTH)
2166 owntype = clazztype;
2167 }
2168 result = check(tree, owntype, VAL, resultInfo);
2169 chk.validate(tree.typeargs, localEnv);
2170 }
2171 //where
2172 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2173 JCTypeApply ta = (JCTypeApply)tree.clazz;
2174 List<JCExpression> prevTypeargs = ta.arguments;
2175 try {
2176 //create a 'fake' diamond AST node by removing type-argument trees
2177 ta.arguments = List.nil();
2178 ResultInfo findDiamondResult = new ResultInfo(VAL,
2179 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2180 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2181 Type polyPt = allowPoly ?
2182 syms.objectType :
2183 clazztype;
2184 if (!inferred.isErroneous() &&
2185 (allowPoly && pt() == Infer.anyPoly ?
2186 types.isSameType(inferred, clazztype) :
2187 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2188 String key = types.isSameType(clazztype, inferred) ?
2189 "diamond.redundant.args" :
2190 "diamond.redundant.args.1";
2191 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2192 }
2193 } finally {
2194 ta.arguments = prevTypeargs;
2195 }
2196 }
2198 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2199 if (allowLambda &&
2200 identifyLambdaCandidate &&
2201 clazztype.hasTag(CLASS) &&
2202 !pt().hasTag(NONE) &&
2203 types.isFunctionalInterface(clazztype.tsym)) {
2204 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2205 int count = 0;
2206 boolean found = false;
2207 for (Symbol sym : csym.members().getElements()) {
2208 if ((sym.flags() & SYNTHETIC) != 0 ||
2209 sym.isConstructor()) continue;
2210 count++;
2211 if (sym.kind != MTH ||
2212 !sym.name.equals(descriptor.name)) continue;
2213 Type mtype = types.memberType(clazztype, sym);
2214 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2215 found = true;
2216 }
2217 }
2218 if (found && count == 1) {
2219 log.note(tree.def, "potential.lambda.found");
2220 }
2221 }
2222 }
2224 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2225 Symbol sym) {
2226 // Ensure that no declaration annotations are present.
2227 // Note that a tree type might be an AnnotatedType with
2228 // empty annotations, if only declaration annotations were given.
2229 // This method will raise an error for such a type.
2230 for (JCAnnotation ai : annotations) {
2231 if (TypeAnnotations.annotationType(syms, names, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2232 log.error(ai.pos(), "annotation.type.not.applicable");
2233 }
2234 }
2235 }
2238 /** Make an attributed null check tree.
2239 */
2240 public JCExpression makeNullCheck(JCExpression arg) {
2241 // optimization: X.this is never null; skip null check
2242 Name name = TreeInfo.name(arg);
2243 if (name == names._this || name == names._super) return arg;
2245 JCTree.Tag optag = NULLCHK;
2246 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2247 tree.operator = syms.nullcheck;
2248 tree.type = arg.type;
2249 return tree;
2250 }
2252 public void visitNewArray(JCNewArray tree) {
2253 Type owntype = types.createErrorType(tree.type);
2254 Env<AttrContext> localEnv = env.dup(tree);
2255 Type elemtype;
2256 if (tree.elemtype != null) {
2257 elemtype = attribType(tree.elemtype, localEnv);
2258 chk.validate(tree.elemtype, localEnv);
2259 owntype = elemtype;
2260 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2261 attribExpr(l.head, localEnv, syms.intType);
2262 owntype = new ArrayType(owntype, syms.arrayClass);
2263 }
2264 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2265 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2266 tree.elemtype.type.tsym);
2267 }
2268 } else {
2269 // we are seeing an untyped aggregate { ... }
2270 // this is allowed only if the prototype is an array
2271 if (pt().hasTag(ARRAY)) {
2272 elemtype = types.elemtype(pt());
2273 } else {
2274 if (!pt().hasTag(ERROR)) {
2275 log.error(tree.pos(), "illegal.initializer.for.type",
2276 pt());
2277 }
2278 elemtype = types.createErrorType(pt());
2279 }
2280 }
2281 if (tree.elems != null) {
2282 attribExprs(tree.elems, localEnv, elemtype);
2283 owntype = new ArrayType(elemtype, syms.arrayClass);
2284 }
2285 if (!types.isReifiable(elemtype))
2286 log.error(tree.pos(), "generic.array.creation");
2287 result = check(tree, owntype, VAL, resultInfo);
2288 }
2290 /*
2291 * A lambda expression can only be attributed when a target-type is available.
2292 * In addition, if the target-type is that of a functional interface whose
2293 * descriptor contains inference variables in argument position the lambda expression
2294 * is 'stuck' (see DeferredAttr).
2295 */
2296 @Override
2297 public void visitLambda(final JCLambda that) {
2298 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2299 if (pt().hasTag(NONE)) {
2300 //lambda only allowed in assignment or method invocation/cast context
2301 log.error(that.pos(), "unexpected.lambda");
2302 }
2303 result = that.type = types.createErrorType(pt());
2304 return;
2305 }
2306 //create an environment for attribution of the lambda expression
2307 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2308 boolean needsRecovery =
2309 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2310 try {
2311 Type currentTarget = pt();
2312 List<Type> explicitParamTypes = null;
2313 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2314 //attribute lambda parameters
2315 attribStats(that.params, localEnv);
2316 explicitParamTypes = TreeInfo.types(that.params);
2317 }
2319 Type lambdaType;
2320 if (pt() != Type.recoveryType) {
2321 /* We need to adjust the target. If the target is an
2322 * intersection type, for example: SAM & I1 & I2 ...
2323 * the target will be updated to SAM
2324 */
2325 currentTarget = targetChecker.visit(currentTarget, that);
2326 if (explicitParamTypes != null) {
2327 currentTarget = infer.instantiateFunctionalInterface(that,
2328 currentTarget, explicitParamTypes, resultInfo.checkContext);
2329 }
2330 lambdaType = types.findDescriptorType(currentTarget);
2331 } else {
2332 currentTarget = Type.recoveryType;
2333 lambdaType = fallbackDescriptorType(that);
2334 }
2336 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2338 if (lambdaType.hasTag(FORALL)) {
2339 //lambda expression target desc cannot be a generic method
2340 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2341 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2342 result = that.type = types.createErrorType(pt());
2343 return;
2344 }
2346 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2347 //add param type info in the AST
2348 List<Type> actuals = lambdaType.getParameterTypes();
2349 List<JCVariableDecl> params = that.params;
2351 boolean arityMismatch = false;
2353 while (params.nonEmpty()) {
2354 if (actuals.isEmpty()) {
2355 //not enough actuals to perform lambda parameter inference
2356 arityMismatch = true;
2357 }
2358 //reset previously set info
2359 Type argType = arityMismatch ?
2360 syms.errType :
2361 actuals.head;
2362 params.head.vartype = make.at(params.head).Type(argType);
2363 params.head.sym = null;
2364 actuals = actuals.isEmpty() ?
2365 actuals :
2366 actuals.tail;
2367 params = params.tail;
2368 }
2370 //attribute lambda parameters
2371 attribStats(that.params, localEnv);
2373 if (arityMismatch) {
2374 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2375 result = that.type = types.createErrorType(currentTarget);
2376 return;
2377 }
2378 }
2380 //from this point on, no recovery is needed; if we are in assignment context
2381 //we will be able to attribute the whole lambda body, regardless of errors;
2382 //if we are in a 'check' method context, and the lambda is not compatible
2383 //with the target-type, it will be recovered anyway in Attr.checkId
2384 needsRecovery = false;
2386 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2387 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2388 new FunctionalReturnContext(resultInfo.checkContext);
2390 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2391 recoveryInfo :
2392 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2393 localEnv.info.returnResult = bodyResultInfo;
2395 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2396 attribTree(that.getBody(), localEnv, bodyResultInfo);
2397 } else {
2398 JCBlock body = (JCBlock)that.body;
2399 attribStats(body.stats, localEnv);
2400 }
2402 result = check(that, currentTarget, VAL, resultInfo);
2404 boolean isSpeculativeRound =
2405 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2407 preFlow(that);
2408 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2410 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2412 if (!isSpeculativeRound) {
2413 //add thrown types as bounds to the thrown types free variables if needed:
2414 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2415 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2416 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asFree(lambdaType.getThrownTypes());
2418 chk.unhandled(inferredThrownTypes, thrownTypes);
2419 }
2421 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2422 }
2423 result = check(that, currentTarget, VAL, resultInfo);
2424 } catch (Types.FunctionDescriptorLookupError ex) {
2425 JCDiagnostic cause = ex.getDiagnostic();
2426 resultInfo.checkContext.report(that, cause);
2427 result = that.type = types.createErrorType(pt());
2428 return;
2429 } finally {
2430 localEnv.info.scope.leave();
2431 if (needsRecovery) {
2432 attribTree(that, env, recoveryInfo);
2433 }
2434 }
2435 }
2436 //where
2437 void preFlow(JCLambda tree) {
2438 new PostAttrAnalyzer() {
2439 @Override
2440 public void scan(JCTree tree) {
2441 if (tree == null ||
2442 (tree.type != null &&
2443 tree.type == Type.stuckType)) {
2444 //don't touch stuck expressions!
2445 return;
2446 }
2447 super.scan(tree);
2448 }
2449 }.scan(tree);
2450 }
2452 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2454 @Override
2455 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2456 return t.isCompound() ?
2457 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2458 }
2460 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2461 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2462 Type target = null;
2463 for (Type bound : ict.getExplicitComponents()) {
2464 TypeSymbol boundSym = bound.tsym;
2465 if (types.isFunctionalInterface(boundSym) &&
2466 types.findDescriptorSymbol(boundSym) == desc) {
2467 target = bound;
2468 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2469 //bound must be an interface
2470 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2471 }
2472 }
2473 return target != null ?
2474 target :
2475 ict.getExplicitComponents().head; //error recovery
2476 }
2478 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2479 ListBuffer<Type> targs = new ListBuffer<>();
2480 ListBuffer<Type> supertypes = new ListBuffer<>();
2481 for (Type i : ict.interfaces_field) {
2482 if (i.isParameterized()) {
2483 targs.appendList(i.tsym.type.allparams());
2484 }
2485 supertypes.append(i.tsym.type);
2486 }
2487 IntersectionClassType notionalIntf =
2488 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2489 notionalIntf.allparams_field = targs.toList();
2490 notionalIntf.tsym.flags_field |= INTERFACE;
2491 return notionalIntf.tsym;
2492 }
2494 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2495 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2496 diags.fragment(key, args)));
2497 }
2498 };
2500 private Type fallbackDescriptorType(JCExpression tree) {
2501 switch (tree.getTag()) {
2502 case LAMBDA:
2503 JCLambda lambda = (JCLambda)tree;
2504 List<Type> argtypes = List.nil();
2505 for (JCVariableDecl param : lambda.params) {
2506 argtypes = param.vartype != null ?
2507 argtypes.append(param.vartype.type) :
2508 argtypes.append(syms.errType);
2509 }
2510 return new MethodType(argtypes, Type.recoveryType,
2511 List.of(syms.throwableType), syms.methodClass);
2512 case REFERENCE:
2513 return new MethodType(List.<Type>nil(), Type.recoveryType,
2514 List.of(syms.throwableType), syms.methodClass);
2515 default:
2516 Assert.error("Cannot get here!");
2517 }
2518 return null;
2519 }
2521 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2522 final InferenceContext inferenceContext, final Type... ts) {
2523 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2524 }
2526 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2527 final InferenceContext inferenceContext, final List<Type> ts) {
2528 if (inferenceContext.free(ts)) {
2529 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2530 @Override
2531 public void typesInferred(InferenceContext inferenceContext) {
2532 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2533 }
2534 });
2535 } else {
2536 for (Type t : ts) {
2537 rs.checkAccessibleType(env, t);
2538 }
2539 }
2540 }
2542 /**
2543 * Lambda/method reference have a special check context that ensures
2544 * that i.e. a lambda return type is compatible with the expected
2545 * type according to both the inherited context and the assignment
2546 * context.
2547 */
2548 class FunctionalReturnContext extends Check.NestedCheckContext {
2550 FunctionalReturnContext(CheckContext enclosingContext) {
2551 super(enclosingContext);
2552 }
2554 @Override
2555 public boolean compatible(Type found, Type req, Warner warn) {
2556 //return type must be compatible in both current context and assignment context
2557 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2558 }
2560 @Override
2561 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2562 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2563 }
2564 }
2566 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2568 JCExpression expr;
2570 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2571 super(enclosingContext);
2572 this.expr = expr;
2573 }
2575 @Override
2576 public boolean compatible(Type found, Type req, Warner warn) {
2577 //a void return is compatible with an expression statement lambda
2578 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2579 super.compatible(found, req, warn);
2580 }
2581 }
2583 /**
2584 * Lambda compatibility. Check that given return types, thrown types, parameter types
2585 * are compatible with the expected functional interface descriptor. This means that:
2586 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2587 * types must be compatible with the return type of the expected descriptor.
2588 */
2589 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2590 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2592 //return values have already been checked - but if lambda has no return
2593 //values, we must ensure that void/value compatibility is correct;
2594 //this amounts at checking that, if a lambda body can complete normally,
2595 //the descriptor's return type must be void
2596 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2597 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2598 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2599 diags.fragment("missing.ret.val", returnType)));
2600 }
2602 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2603 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2604 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2605 }
2606 }
2608 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2609 Env<AttrContext> lambdaEnv;
2610 Symbol owner = env.info.scope.owner;
2611 if (owner.kind == VAR && owner.owner.kind == TYP) {
2612 //field initializer
2613 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2614 lambdaEnv.info.scope.owner =
2615 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2616 env.info.scope.owner);
2617 } else {
2618 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2619 }
2620 return lambdaEnv;
2621 }
2623 @Override
2624 public void visitReference(final JCMemberReference that) {
2625 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2626 if (pt().hasTag(NONE)) {
2627 //method reference only allowed in assignment or method invocation/cast context
2628 log.error(that.pos(), "unexpected.mref");
2629 }
2630 result = that.type = types.createErrorType(pt());
2631 return;
2632 }
2633 final Env<AttrContext> localEnv = env.dup(that);
2634 try {
2635 //attribute member reference qualifier - if this is a constructor
2636 //reference, the expected kind must be a type
2637 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2639 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2640 exprType = chk.checkConstructorRefType(that.expr, exprType);
2641 if (!exprType.isErroneous() &&
2642 exprType.isRaw() &&
2643 that.typeargs != null) {
2644 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2645 diags.fragment("mref.infer.and.explicit.params"));
2646 exprType = types.createErrorType(exprType);
2647 }
2648 }
2650 if (exprType.isErroneous()) {
2651 //if the qualifier expression contains problems,
2652 //give up attribution of method reference
2653 result = that.type = exprType;
2654 return;
2655 }
2657 if (TreeInfo.isStaticSelector(that.expr, names)) {
2658 //if the qualifier is a type, validate it; raw warning check is
2659 //omitted as we don't know at this stage as to whether this is a
2660 //raw selector (because of inference)
2661 chk.validate(that.expr, env, false);
2662 }
2664 //attrib type-arguments
2665 List<Type> typeargtypes = List.nil();
2666 if (that.typeargs != null) {
2667 typeargtypes = attribTypes(that.typeargs, localEnv);
2668 }
2670 Type target;
2671 Type desc;
2672 if (pt() != Type.recoveryType) {
2673 target = targetChecker.visit(pt(), that);
2674 desc = types.findDescriptorType(target);
2675 } else {
2676 target = Type.recoveryType;
2677 desc = fallbackDescriptorType(that);
2678 }
2680 setFunctionalInfo(localEnv, that, pt(), desc, target, resultInfo.checkContext);
2681 List<Type> argtypes = desc.getParameterTypes();
2682 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2684 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2685 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2686 }
2688 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2689 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2690 try {
2691 refResult = rs.resolveMemberReference(that.pos(), localEnv, that, that.expr.type,
2692 that.name, argtypes, typeargtypes, true, referenceCheck,
2693 resultInfo.checkContext.inferenceContext());
2694 } finally {
2695 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2696 }
2698 Symbol refSym = refResult.fst;
2699 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2701 if (refSym.kind != MTH) {
2702 boolean targetError;
2703 switch (refSym.kind) {
2704 case ABSENT_MTH:
2705 targetError = false;
2706 break;
2707 case WRONG_MTH:
2708 case WRONG_MTHS:
2709 case AMBIGUOUS:
2710 case HIDDEN:
2711 case STATICERR:
2712 case MISSING_ENCL:
2713 targetError = true;
2714 break;
2715 default:
2716 Assert.error("unexpected result kind " + refSym.kind);
2717 targetError = false;
2718 }
2720 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2721 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2723 JCDiagnostic.DiagnosticType diagKind = targetError ?
2724 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2726 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2727 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2729 if (targetError && target == Type.recoveryType) {
2730 //a target error doesn't make sense during recovery stage
2731 //as we don't know what actual parameter types are
2732 result = that.type = target;
2733 return;
2734 } else {
2735 if (targetError) {
2736 resultInfo.checkContext.report(that, diag);
2737 } else {
2738 log.report(diag);
2739 }
2740 result = that.type = types.createErrorType(target);
2741 return;
2742 }
2743 }
2745 that.sym = refSym.baseSymbol();
2746 that.kind = lookupHelper.referenceKind(that.sym);
2747 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2749 if (desc.getReturnType() == Type.recoveryType) {
2750 // stop here
2751 result = that.type = target;
2752 return;
2753 }
2755 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2757 if (that.getMode() == ReferenceMode.INVOKE &&
2758 TreeInfo.isStaticSelector(that.expr, names) &&
2759 that.kind.isUnbound() &&
2760 !desc.getParameterTypes().head.isParameterized()) {
2761 chk.checkRaw(that.expr, localEnv);
2762 }
2764 if (!that.kind.isUnbound() &&
2765 that.getMode() == ReferenceMode.INVOKE &&
2766 TreeInfo.isStaticSelector(that.expr, names) &&
2767 !that.sym.isStatic()) {
2768 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2769 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2770 result = that.type = types.createErrorType(target);
2771 return;
2772 }
2774 if (that.kind.isUnbound() &&
2775 that.getMode() == ReferenceMode.INVOKE &&
2776 TreeInfo.isStaticSelector(that.expr, names) &&
2777 that.sym.isStatic()) {
2778 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2779 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2780 result = that.type = types.createErrorType(target);
2781 return;
2782 }
2784 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2785 exprType.getTypeArguments().nonEmpty()) {
2786 //static ref with class type-args
2787 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2788 diags.fragment("static.mref.with.targs"));
2789 result = that.type = types.createErrorType(target);
2790 return;
2791 }
2793 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2794 !that.kind.isUnbound()) {
2795 //no static bound mrefs
2796 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2797 diags.fragment("static.bound.mref"));
2798 result = that.type = types.createErrorType(target);
2799 return;
2800 }
2802 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2803 // Check that super-qualified symbols are not abstract (JLS)
2804 rs.checkNonAbstract(that.pos(), that.sym);
2805 }
2806 }
2808 ResultInfo checkInfo =
2809 resultInfo.dup(newMethodTemplate(
2810 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2811 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes));
2813 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2815 if (that.kind.isUnbound() &&
2816 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2817 //re-generate inference constraints for unbound receiver
2818 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asFree(argtypes.head), exprType)) {
2819 //cannot happen as this has already been checked - we just need
2820 //to regenerate the inference constraints, as that has been lost
2821 //as a result of the call to inferenceContext.save()
2822 Assert.error("Can't get here");
2823 }
2824 }
2826 if (!refType.isErroneous()) {
2827 refType = types.createMethodTypeWithReturn(refType,
2828 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2829 }
2831 //go ahead with standard method reference compatibility check - note that param check
2832 //is a no-op (as this has been taken care during method applicability)
2833 boolean isSpeculativeRound =
2834 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2835 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2836 if (!isSpeculativeRound) {
2837 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2838 }
2839 result = check(that, target, VAL, resultInfo);
2840 } catch (Types.FunctionDescriptorLookupError ex) {
2841 JCDiagnostic cause = ex.getDiagnostic();
2842 resultInfo.checkContext.report(that, cause);
2843 result = that.type = types.createErrorType(pt());
2844 return;
2845 }
2846 }
2847 //where
2848 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2849 //if this is a constructor reference, the expected kind must be a type
2850 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2851 }
2854 @SuppressWarnings("fallthrough")
2855 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2856 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2858 Type resType;
2859 switch (tree.getMode()) {
2860 case NEW:
2861 if (!tree.expr.type.isRaw()) {
2862 resType = tree.expr.type;
2863 break;
2864 }
2865 default:
2866 resType = refType.getReturnType();
2867 }
2869 Type incompatibleReturnType = resType;
2871 if (returnType.hasTag(VOID)) {
2872 incompatibleReturnType = null;
2873 }
2875 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2876 if (resType.isErroneous() ||
2877 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2878 incompatibleReturnType = null;
2879 }
2880 }
2882 if (incompatibleReturnType != null) {
2883 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2884 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2885 }
2887 if (!speculativeAttr) {
2888 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2889 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2890 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2891 }
2892 }
2893 }
2895 /**
2896 * Set functional type info on the underlying AST. Note: as the target descriptor
2897 * might contain inference variables, we might need to register an hook in the
2898 * current inference context.
2899 */
2900 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2901 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2902 if (checkContext.inferenceContext().free(descriptorType)) {
2903 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2904 public void typesInferred(InferenceContext inferenceContext) {
2905 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2906 inferenceContext.asInstType(primaryTarget), checkContext);
2907 }
2908 });
2909 } else {
2910 ListBuffer<Type> targets = new ListBuffer<>();
2911 if (pt.hasTag(CLASS)) {
2912 if (pt.isCompound()) {
2913 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2914 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2915 if (t != primaryTarget) {
2916 targets.append(types.removeWildcards(t));
2917 }
2918 }
2919 } else {
2920 targets.append(types.removeWildcards(primaryTarget));
2921 }
2922 }
2923 fExpr.targets = targets.toList();
2924 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2925 pt != Type.recoveryType) {
2926 //check that functional interface class is well-formed
2927 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2928 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2929 if (csym != null) {
2930 chk.checkImplementations(env.tree, csym, csym);
2931 }
2932 }
2933 }
2934 }
2936 public void visitParens(JCParens tree) {
2937 Type owntype = attribTree(tree.expr, env, resultInfo);
2938 result = check(tree, owntype, pkind(), resultInfo);
2939 Symbol sym = TreeInfo.symbol(tree);
2940 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2941 log.error(tree.pos(), "illegal.start.of.type");
2942 }
2944 public void visitAssign(JCAssign tree) {
2945 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2946 Type capturedType = capture(owntype);
2947 attribExpr(tree.rhs, env, owntype);
2948 result = check(tree, capturedType, VAL, resultInfo);
2949 }
2951 public void visitAssignop(JCAssignOp tree) {
2952 // Attribute arguments.
2953 Type owntype = attribTree(tree.lhs, env, varInfo);
2954 Type operand = attribExpr(tree.rhs, env);
2955 // Find operator.
2956 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2957 tree.pos(), tree.getTag().noAssignOp(), env,
2958 owntype, operand);
2960 if (operator.kind == MTH &&
2961 !owntype.isErroneous() &&
2962 !operand.isErroneous()) {
2963 chk.checkOperator(tree.pos(),
2964 (OperatorSymbol)operator,
2965 tree.getTag().noAssignOp(),
2966 owntype,
2967 operand);
2968 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2969 chk.checkCastable(tree.rhs.pos(),
2970 operator.type.getReturnType(),
2971 owntype);
2972 }
2973 result = check(tree, owntype, VAL, resultInfo);
2974 }
2976 public void visitUnary(JCUnary tree) {
2977 // Attribute arguments.
2978 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2979 ? attribTree(tree.arg, env, varInfo)
2980 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2982 // Find operator.
2983 Symbol operator = tree.operator =
2984 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2986 Type owntype = types.createErrorType(tree.type);
2987 if (operator.kind == MTH &&
2988 !argtype.isErroneous()) {
2989 owntype = (tree.getTag().isIncOrDecUnaryOp())
2990 ? tree.arg.type
2991 : operator.type.getReturnType();
2992 int opc = ((OperatorSymbol)operator).opcode;
2994 // If the argument is constant, fold it.
2995 if (argtype.constValue() != null) {
2996 Type ctype = cfolder.fold1(opc, argtype);
2997 if (ctype != null) {
2998 owntype = cfolder.coerce(ctype, owntype);
3000 // Remove constant types from arguments to
3001 // conserve space. The parser will fold concatenations
3002 // of string literals; the code here also
3003 // gets rid of intermediate results when some of the
3004 // operands are constant identifiers.
3005 if (tree.arg.type.tsym == syms.stringType.tsym) {
3006 tree.arg.type = syms.stringType;
3007 }
3008 }
3009 }
3010 }
3011 result = check(tree, owntype, VAL, resultInfo);
3012 }
3014 public void visitBinary(JCBinary tree) {
3015 // Attribute arguments.
3016 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3017 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3019 // Find operator.
3020 Symbol operator = tree.operator =
3021 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3023 Type owntype = types.createErrorType(tree.type);
3024 if (operator.kind == MTH &&
3025 !left.isErroneous() &&
3026 !right.isErroneous()) {
3027 owntype = operator.type.getReturnType();
3028 // This will figure out when unboxing can happen and
3029 // choose the right comparison operator.
3030 int opc = chk.checkOperator(tree.lhs.pos(),
3031 (OperatorSymbol)operator,
3032 tree.getTag(),
3033 left,
3034 right);
3036 // If both arguments are constants, fold them.
3037 if (left.constValue() != null && right.constValue() != null) {
3038 Type ctype = cfolder.fold2(opc, left, right);
3039 if (ctype != null) {
3040 owntype = cfolder.coerce(ctype, owntype);
3042 // Remove constant types from arguments to
3043 // conserve space. The parser will fold concatenations
3044 // of string literals; the code here also
3045 // gets rid of intermediate results when some of the
3046 // operands are constant identifiers.
3047 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3048 tree.lhs.type = syms.stringType;
3049 }
3050 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3051 tree.rhs.type = syms.stringType;
3052 }
3053 }
3054 }
3056 // Check that argument types of a reference ==, != are
3057 // castable to each other, (JLS 15.21). Note: unboxing
3058 // comparisons will not have an acmp* opc at this point.
3059 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3060 if (!types.isEqualityComparable(left, right,
3061 new Warner(tree.pos()))) {
3062 log.error(tree.pos(), "incomparable.types", left, right);
3063 }
3064 }
3066 chk.checkDivZero(tree.rhs.pos(), operator, right);
3067 }
3068 result = check(tree, owntype, VAL, resultInfo);
3069 }
3071 public void visitTypeCast(final JCTypeCast tree) {
3072 Type clazztype = attribType(tree.clazz, env);
3073 chk.validate(tree.clazz, env, false);
3074 //a fresh environment is required for 292 inference to work properly ---
3075 //see Infer.instantiatePolymorphicSignatureInstance()
3076 Env<AttrContext> localEnv = env.dup(tree);
3077 //should we propagate the target type?
3078 final ResultInfo castInfo;
3079 JCExpression expr = TreeInfo.skipParens(tree.expr);
3080 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3081 if (isPoly) {
3082 //expression is a poly - we need to propagate target type info
3083 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3084 @Override
3085 public boolean compatible(Type found, Type req, Warner warn) {
3086 return types.isCastable(found, req, warn);
3087 }
3088 });
3089 } else {
3090 //standalone cast - target-type info is not propagated
3091 castInfo = unknownExprInfo;
3092 }
3093 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3094 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3095 if (exprtype.constValue() != null)
3096 owntype = cfolder.coerce(exprtype, owntype);
3097 result = check(tree, capture(owntype), VAL, resultInfo);
3098 if (!isPoly)
3099 chk.checkRedundantCast(localEnv, tree);
3100 }
3102 public void visitTypeTest(JCInstanceOf tree) {
3103 Type exprtype = chk.checkNullOrRefType(
3104 tree.expr.pos(), attribExpr(tree.expr, env));
3105 Type clazztype = attribType(tree.clazz, env);
3106 if (!clazztype.hasTag(TYPEVAR)) {
3107 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3108 }
3109 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3110 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3111 clazztype = types.createErrorType(clazztype);
3112 }
3113 chk.validate(tree.clazz, env, false);
3114 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3115 result = check(tree, syms.booleanType, VAL, resultInfo);
3116 }
3118 public void visitIndexed(JCArrayAccess tree) {
3119 Type owntype = types.createErrorType(tree.type);
3120 Type atype = attribExpr(tree.indexed, env);
3121 attribExpr(tree.index, env, syms.intType);
3122 if (types.isArray(atype))
3123 owntype = types.elemtype(atype);
3124 else if (!atype.hasTag(ERROR))
3125 log.error(tree.pos(), "array.req.but.found", atype);
3126 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3127 result = check(tree, owntype, VAR, resultInfo);
3128 }
3130 public void visitIdent(JCIdent tree) {
3131 Symbol sym;
3133 // Find symbol
3134 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3135 // If we are looking for a method, the prototype `pt' will be a
3136 // method type with the type of the call's arguments as parameters.
3137 env.info.pendingResolutionPhase = null;
3138 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3139 } else if (tree.sym != null && tree.sym.kind != VAR) {
3140 sym = tree.sym;
3141 } else {
3142 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3143 }
3144 tree.sym = sym;
3146 // (1) Also find the environment current for the class where
3147 // sym is defined (`symEnv').
3148 // Only for pre-tiger versions (1.4 and earlier):
3149 // (2) Also determine whether we access symbol out of an anonymous
3150 // class in a this or super call. This is illegal for instance
3151 // members since such classes don't carry a this$n link.
3152 // (`noOuterThisPath').
3153 Env<AttrContext> symEnv = env;
3154 boolean noOuterThisPath = false;
3155 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3156 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3157 sym.owner.kind == TYP &&
3158 tree.name != names._this && tree.name != names._super) {
3160 // Find environment in which identifier is defined.
3161 while (symEnv.outer != null &&
3162 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3163 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3164 noOuterThisPath = !allowAnonOuterThis;
3165 symEnv = symEnv.outer;
3166 }
3167 }
3169 // If symbol is a variable, ...
3170 if (sym.kind == VAR) {
3171 VarSymbol v = (VarSymbol)sym;
3173 // ..., evaluate its initializer, if it has one, and check for
3174 // illegal forward reference.
3175 checkInit(tree, env, v, false);
3177 // If we are expecting a variable (as opposed to a value), check
3178 // that the variable is assignable in the current environment.
3179 if (pkind() == VAR)
3180 checkAssignable(tree.pos(), v, null, env);
3181 }
3183 // In a constructor body,
3184 // if symbol is a field or instance method, check that it is
3185 // not accessed before the supertype constructor is called.
3186 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3187 (sym.kind & (VAR | MTH)) != 0 &&
3188 sym.owner.kind == TYP &&
3189 (sym.flags() & STATIC) == 0) {
3190 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3191 }
3192 Env<AttrContext> env1 = env;
3193 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3194 // If the found symbol is inaccessible, then it is
3195 // accessed through an enclosing instance. Locate this
3196 // enclosing instance:
3197 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3198 env1 = env1.outer;
3199 }
3200 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3201 }
3203 public void visitSelect(JCFieldAccess tree) {
3204 // Determine the expected kind of the qualifier expression.
3205 int skind = 0;
3206 if (tree.name == names._this || tree.name == names._super ||
3207 tree.name == names._class)
3208 {
3209 skind = TYP;
3210 } else {
3211 if ((pkind() & PCK) != 0) skind = skind | PCK;
3212 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3213 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3214 }
3216 // Attribute the qualifier expression, and determine its symbol (if any).
3217 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3218 if ((pkind() & (PCK | TYP)) == 0)
3219 site = capture(site); // Capture field access
3221 // don't allow T.class T[].class, etc
3222 if (skind == TYP) {
3223 Type elt = site;
3224 while (elt.hasTag(ARRAY))
3225 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3226 if (elt.hasTag(TYPEVAR)) {
3227 log.error(tree.pos(), "type.var.cant.be.deref");
3228 result = types.createErrorType(tree.type);
3229 return;
3230 }
3231 }
3233 // If qualifier symbol is a type or `super', assert `selectSuper'
3234 // for the selection. This is relevant for determining whether
3235 // protected symbols are accessible.
3236 Symbol sitesym = TreeInfo.symbol(tree.selected);
3237 boolean selectSuperPrev = env.info.selectSuper;
3238 env.info.selectSuper =
3239 sitesym != null &&
3240 sitesym.name == names._super;
3242 // Determine the symbol represented by the selection.
3243 env.info.pendingResolutionPhase = null;
3244 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3245 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3246 site = capture(site);
3247 sym = selectSym(tree, sitesym, site, env, resultInfo);
3248 }
3249 boolean varArgs = env.info.lastResolveVarargs();
3250 tree.sym = sym;
3252 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3253 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3254 site = capture(site);
3255 }
3257 // If that symbol is a variable, ...
3258 if (sym.kind == VAR) {
3259 VarSymbol v = (VarSymbol)sym;
3261 // ..., evaluate its initializer, if it has one, and check for
3262 // illegal forward reference.
3263 checkInit(tree, env, v, true);
3265 // If we are expecting a variable (as opposed to a value), check
3266 // that the variable is assignable in the current environment.
3267 if (pkind() == VAR)
3268 checkAssignable(tree.pos(), v, tree.selected, env);
3269 }
3271 if (sitesym != null &&
3272 sitesym.kind == VAR &&
3273 ((VarSymbol)sitesym).isResourceVariable() &&
3274 sym.kind == MTH &&
3275 sym.name.equals(names.close) &&
3276 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3277 env.info.lint.isEnabled(LintCategory.TRY)) {
3278 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3279 }
3281 // Disallow selecting a type from an expression
3282 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3283 tree.type = check(tree.selected, pt(),
3284 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3285 }
3287 if (isType(sitesym)) {
3288 if (sym.name == names._this) {
3289 // If `C' is the currently compiled class, check that
3290 // C.this' does not appear in a call to a super(...)
3291 if (env.info.isSelfCall &&
3292 site.tsym == env.enclClass.sym) {
3293 chk.earlyRefError(tree.pos(), sym);
3294 }
3295 } else {
3296 // Check if type-qualified fields or methods are static (JLS)
3297 if ((sym.flags() & STATIC) == 0 &&
3298 !env.next.tree.hasTag(REFERENCE) &&
3299 sym.name != names._super &&
3300 (sym.kind == VAR || sym.kind == MTH)) {
3301 rs.accessBase(rs.new StaticError(sym),
3302 tree.pos(), site, sym.name, true);
3303 }
3304 }
3305 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3306 // If the qualified item is not a type and the selected item is static, report
3307 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3308 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3309 }
3311 // If we are selecting an instance member via a `super', ...
3312 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3314 // Check that super-qualified symbols are not abstract (JLS)
3315 rs.checkNonAbstract(tree.pos(), sym);
3317 if (site.isRaw()) {
3318 // Determine argument types for site.
3319 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3320 if (site1 != null) site = site1;
3321 }
3322 }
3324 env.info.selectSuper = selectSuperPrev;
3325 result = checkId(tree, site, sym, env, resultInfo);
3326 }
3327 //where
3328 /** Determine symbol referenced by a Select expression,
3329 *
3330 * @param tree The select tree.
3331 * @param site The type of the selected expression,
3332 * @param env The current environment.
3333 * @param resultInfo The current result.
3334 */
3335 private Symbol selectSym(JCFieldAccess tree,
3336 Symbol location,
3337 Type site,
3338 Env<AttrContext> env,
3339 ResultInfo resultInfo) {
3340 DiagnosticPosition pos = tree.pos();
3341 Name name = tree.name;
3342 switch (site.getTag()) {
3343 case PACKAGE:
3344 return rs.accessBase(
3345 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3346 pos, location, site, name, true);
3347 case ARRAY:
3348 case CLASS:
3349 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3350 return rs.resolveQualifiedMethod(
3351 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3352 } else if (name == names._this || name == names._super) {
3353 return rs.resolveSelf(pos, env, site.tsym, name);
3354 } else if (name == names._class) {
3355 // In this case, we have already made sure in
3356 // visitSelect that qualifier expression is a type.
3357 Type t = syms.classType;
3358 List<Type> typeargs = allowGenerics
3359 ? List.of(types.erasure(site))
3360 : List.<Type>nil();
3361 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3362 return new VarSymbol(
3363 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3364 } else {
3365 // We are seeing a plain identifier as selector.
3366 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3367 if ((resultInfo.pkind & ERRONEOUS) == 0)
3368 sym = rs.accessBase(sym, pos, location, site, name, true);
3369 return sym;
3370 }
3371 case WILDCARD:
3372 throw new AssertionError(tree);
3373 case TYPEVAR:
3374 // Normally, site.getUpperBound() shouldn't be null.
3375 // It should only happen during memberEnter/attribBase
3376 // when determining the super type which *must* beac
3377 // done before attributing the type variables. In
3378 // other words, we are seeing this illegal program:
3379 // class B<T> extends A<T.foo> {}
3380 Symbol sym = (site.getUpperBound() != null)
3381 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3382 : null;
3383 if (sym == null) {
3384 log.error(pos, "type.var.cant.be.deref");
3385 return syms.errSymbol;
3386 } else {
3387 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3388 rs.new AccessError(env, site, sym) :
3389 sym;
3390 rs.accessBase(sym2, pos, location, site, name, true);
3391 return sym;
3392 }
3393 case ERROR:
3394 // preserve identifier names through errors
3395 return types.createErrorType(name, site.tsym, site).tsym;
3396 default:
3397 // The qualifier expression is of a primitive type -- only
3398 // .class is allowed for these.
3399 if (name == names._class) {
3400 // In this case, we have already made sure in Select that
3401 // qualifier expression is a type.
3402 Type t = syms.classType;
3403 Type arg = types.boxedClass(site).type;
3404 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3405 return new VarSymbol(
3406 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3407 } else {
3408 log.error(pos, "cant.deref", site);
3409 return syms.errSymbol;
3410 }
3411 }
3412 }
3414 /** Determine type of identifier or select expression and check that
3415 * (1) the referenced symbol is not deprecated
3416 * (2) the symbol's type is safe (@see checkSafe)
3417 * (3) if symbol is a variable, check that its type and kind are
3418 * compatible with the prototype and protokind.
3419 * (4) if symbol is an instance field of a raw type,
3420 * which is being assigned to, issue an unchecked warning if its
3421 * type changes under erasure.
3422 * (5) if symbol is an instance method of a raw type, issue an
3423 * unchecked warning if its argument types change under erasure.
3424 * If checks succeed:
3425 * If symbol is a constant, return its constant type
3426 * else if symbol is a method, return its result type
3427 * otherwise return its type.
3428 * Otherwise return errType.
3429 *
3430 * @param tree The syntax tree representing the identifier
3431 * @param site If this is a select, the type of the selected
3432 * expression, otherwise the type of the current class.
3433 * @param sym The symbol representing the identifier.
3434 * @param env The current environment.
3435 * @param resultInfo The expected result
3436 */
3437 Type checkId(JCTree tree,
3438 Type site,
3439 Symbol sym,
3440 Env<AttrContext> env,
3441 ResultInfo resultInfo) {
3442 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3443 checkMethodId(tree, site, sym, env, resultInfo) :
3444 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3445 }
3447 Type checkMethodId(JCTree tree,
3448 Type site,
3449 Symbol sym,
3450 Env<AttrContext> env,
3451 ResultInfo resultInfo) {
3452 boolean isPolymorhicSignature =
3453 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3454 return isPolymorhicSignature ?
3455 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3456 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3457 }
3459 Type checkSigPolyMethodId(JCTree tree,
3460 Type site,
3461 Symbol sym,
3462 Env<AttrContext> env,
3463 ResultInfo resultInfo) {
3464 //recover original symbol for signature polymorphic methods
3465 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3466 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3467 return sym.type;
3468 }
3470 Type checkMethodIdInternal(JCTree tree,
3471 Type site,
3472 Symbol sym,
3473 Env<AttrContext> env,
3474 ResultInfo resultInfo) {
3475 if ((resultInfo.pkind & POLY) != 0) {
3476 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3477 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3478 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3479 return owntype;
3480 } else {
3481 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3482 }
3483 }
3485 Type checkIdInternal(JCTree tree,
3486 Type site,
3487 Symbol sym,
3488 Type pt,
3489 Env<AttrContext> env,
3490 ResultInfo resultInfo) {
3491 if (pt.isErroneous()) {
3492 return types.createErrorType(site);
3493 }
3494 Type owntype; // The computed type of this identifier occurrence.
3495 switch (sym.kind) {
3496 case TYP:
3497 // For types, the computed type equals the symbol's type,
3498 // except for two situations:
3499 owntype = sym.type;
3500 if (owntype.hasTag(CLASS)) {
3501 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3502 Type ownOuter = owntype.getEnclosingType();
3504 // (a) If the symbol's type is parameterized, erase it
3505 // because no type parameters were given.
3506 // We recover generic outer type later in visitTypeApply.
3507 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3508 owntype = types.erasure(owntype);
3509 }
3511 // (b) If the symbol's type is an inner class, then
3512 // we have to interpret its outer type as a superclass
3513 // of the site type. Example:
3514 //
3515 // class Tree<A> { class Visitor { ... } }
3516 // class PointTree extends Tree<Point> { ... }
3517 // ...PointTree.Visitor...
3518 //
3519 // Then the type of the last expression above is
3520 // Tree<Point>.Visitor.
3521 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3522 Type normOuter = site;
3523 if (normOuter.hasTag(CLASS)) {
3524 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3525 if (site.isAnnotated()) {
3526 // Propagate any type annotations.
3527 // TODO: should asEnclosingSuper do this?
3528 // Note that the type annotations in site will be updated
3529 // by annotateType. Therefore, modify site instead
3530 // of creating a new AnnotatedType.
3531 ((AnnotatedType)site).underlyingType = normOuter;
3532 normOuter = site;
3533 }
3534 }
3535 if (normOuter == null) // perhaps from an import
3536 normOuter = types.erasure(ownOuter);
3537 if (normOuter != ownOuter)
3538 owntype = new ClassType(
3539 normOuter, List.<Type>nil(), owntype.tsym);
3540 }
3541 }
3542 break;
3543 case VAR:
3544 VarSymbol v = (VarSymbol)sym;
3545 // Test (4): if symbol is an instance field of a raw type,
3546 // which is being assigned to, issue an unchecked warning if
3547 // its type changes under erasure.
3548 if (allowGenerics &&
3549 resultInfo.pkind == VAR &&
3550 v.owner.kind == TYP &&
3551 (v.flags() & STATIC) == 0 &&
3552 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3553 Type s = types.asOuterSuper(site, v.owner);
3554 if (s != null &&
3555 s.isRaw() &&
3556 !types.isSameType(v.type, v.erasure(types))) {
3557 chk.warnUnchecked(tree.pos(),
3558 "unchecked.assign.to.var",
3559 v, s);
3560 }
3561 }
3562 // The computed type of a variable is the type of the
3563 // variable symbol, taken as a member of the site type.
3564 owntype = (sym.owner.kind == TYP &&
3565 sym.name != names._this && sym.name != names._super)
3566 ? types.memberType(site, sym)
3567 : sym.type;
3569 // If the variable is a constant, record constant value in
3570 // computed type.
3571 if (v.getConstValue() != null && isStaticReference(tree))
3572 owntype = owntype.constType(v.getConstValue());
3574 if (resultInfo.pkind == VAL) {
3575 owntype = capture(owntype); // capture "names as expressions"
3576 }
3577 break;
3578 case MTH: {
3579 owntype = checkMethod(site, sym,
3580 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3581 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3582 resultInfo.pt.getTypeArguments());
3583 break;
3584 }
3585 case PCK: case ERR:
3586 owntype = sym.type;
3587 break;
3588 default:
3589 throw new AssertionError("unexpected kind: " + sym.kind +
3590 " in tree " + tree);
3591 }
3593 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3594 // (for constructors, the error was given when the constructor was
3595 // resolved)
3597 if (sym.name != names.init) {
3598 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3599 chk.checkSunAPI(tree.pos(), sym);
3600 chk.checkProfile(tree.pos(), sym);
3601 }
3603 // Test (3): if symbol is a variable, check that its type and
3604 // kind are compatible with the prototype and protokind.
3605 return check(tree, owntype, sym.kind, resultInfo);
3606 }
3608 /** Check that variable is initialized and evaluate the variable's
3609 * initializer, if not yet done. Also check that variable is not
3610 * referenced before it is defined.
3611 * @param tree The tree making up the variable reference.
3612 * @param env The current environment.
3613 * @param v The variable's symbol.
3614 */
3615 private void checkInit(JCTree tree,
3616 Env<AttrContext> env,
3617 VarSymbol v,
3618 boolean onlyWarning) {
3619 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3620 // tree.pos + " " + v.pos + " " +
3621 // Resolve.isStatic(env));//DEBUG
3623 // A forward reference is diagnosed if the declaration position
3624 // of the variable is greater than the current tree position
3625 // and the tree and variable definition occur in the same class
3626 // definition. Note that writes don't count as references.
3627 // This check applies only to class and instance
3628 // variables. Local variables follow different scope rules,
3629 // and are subject to definite assignment checking.
3630 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3631 v.owner.kind == TYP &&
3632 canOwnInitializer(owner(env)) &&
3633 v.owner == env.info.scope.owner.enclClass() &&
3634 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3635 (!env.tree.hasTag(ASSIGN) ||
3636 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3637 String suffix = (env.info.enclVar == v) ?
3638 "self.ref" : "forward.ref";
3639 if (!onlyWarning || isStaticEnumField(v)) {
3640 log.error(tree.pos(), "illegal." + suffix);
3641 } else if (useBeforeDeclarationWarning) {
3642 log.warning(tree.pos(), suffix, v);
3643 }
3644 }
3646 v.getConstValue(); // ensure initializer is evaluated
3648 checkEnumInitializer(tree, env, v);
3649 }
3651 /**
3652 * Check for illegal references to static members of enum. In
3653 * an enum type, constructors and initializers may not
3654 * reference its static members unless they are constant.
3655 *
3656 * @param tree The tree making up the variable reference.
3657 * @param env The current environment.
3658 * @param v The variable's symbol.
3659 * @jls section 8.9 Enums
3660 */
3661 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3662 // JLS:
3663 //
3664 // "It is a compile-time error to reference a static field
3665 // of an enum type that is not a compile-time constant
3666 // (15.28) from constructors, instance initializer blocks,
3667 // or instance variable initializer expressions of that
3668 // type. It is a compile-time error for the constructors,
3669 // instance initializer blocks, or instance variable
3670 // initializer expressions of an enum constant e to refer
3671 // to itself or to an enum constant of the same type that
3672 // is declared to the right of e."
3673 if (isStaticEnumField(v)) {
3674 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3676 if (enclClass == null || enclClass.owner == null)
3677 return;
3679 // See if the enclosing class is the enum (or a
3680 // subclass thereof) declaring v. If not, this
3681 // reference is OK.
3682 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3683 return;
3685 // If the reference isn't from an initializer, then
3686 // the reference is OK.
3687 if (!Resolve.isInitializer(env))
3688 return;
3690 log.error(tree.pos(), "illegal.enum.static.ref");
3691 }
3692 }
3694 /** Is the given symbol a static, non-constant field of an Enum?
3695 * Note: enum literals should not be regarded as such
3696 */
3697 private boolean isStaticEnumField(VarSymbol v) {
3698 return Flags.isEnum(v.owner) &&
3699 Flags.isStatic(v) &&
3700 !Flags.isConstant(v) &&
3701 v.name != names._class;
3702 }
3704 /** Can the given symbol be the owner of code which forms part
3705 * if class initialization? This is the case if the symbol is
3706 * a type or field, or if the symbol is the synthetic method.
3707 * owning a block.
3708 */
3709 private boolean canOwnInitializer(Symbol sym) {
3710 return
3711 (sym.kind & (VAR | TYP)) != 0 ||
3712 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3713 }
3715 Warner noteWarner = new Warner();
3717 /**
3718 * Check that method arguments conform to its instantiation.
3719 **/
3720 public Type checkMethod(Type site,
3721 final Symbol sym,
3722 ResultInfo resultInfo,
3723 Env<AttrContext> env,
3724 final List<JCExpression> argtrees,
3725 List<Type> argtypes,
3726 List<Type> typeargtypes) {
3727 // Test (5): if symbol is an instance method of a raw type, issue
3728 // an unchecked warning if its argument types change under erasure.
3729 if (allowGenerics &&
3730 (sym.flags() & STATIC) == 0 &&
3731 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3732 Type s = types.asOuterSuper(site, sym.owner);
3733 if (s != null && s.isRaw() &&
3734 !types.isSameTypes(sym.type.getParameterTypes(),
3735 sym.erasure(types).getParameterTypes())) {
3736 chk.warnUnchecked(env.tree.pos(),
3737 "unchecked.call.mbr.of.raw.type",
3738 sym, s);
3739 }
3740 }
3742 if (env.info.defaultSuperCallSite != null) {
3743 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3744 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3745 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3746 List<MethodSymbol> icand_sup =
3747 types.interfaceCandidates(sup, (MethodSymbol)sym);
3748 if (icand_sup.nonEmpty() &&
3749 icand_sup.head != sym &&
3750 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3751 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3752 diags.fragment("overridden.default", sym, sup));
3753 break;
3754 }
3755 }
3756 env.info.defaultSuperCallSite = null;
3757 }
3759 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3760 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3761 if (app.meth.hasTag(SELECT) &&
3762 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3763 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3764 }
3765 }
3767 // Compute the identifier's instantiated type.
3768 // For methods, we need to compute the instance type by
3769 // Resolve.instantiate from the symbol's type as well as
3770 // any type arguments and value arguments.
3771 noteWarner.clear();
3772 try {
3773 Type owntype = rs.checkMethod(
3774 env,
3775 site,
3776 sym,
3777 resultInfo,
3778 argtypes,
3779 typeargtypes,
3780 noteWarner);
3782 DeferredAttr.DeferredTypeMap checkDeferredMap =
3783 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3785 argtypes = Type.map(argtypes, checkDeferredMap);
3787 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3788 chk.warnUnchecked(env.tree.pos(),
3789 "unchecked.meth.invocation.applied",
3790 kindName(sym),
3791 sym.name,
3792 rs.methodArguments(sym.type.getParameterTypes()),
3793 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3794 kindName(sym.location()),
3795 sym.location());
3796 owntype = new MethodType(owntype.getParameterTypes(),
3797 types.erasure(owntype.getReturnType()),
3798 types.erasure(owntype.getThrownTypes()),
3799 syms.methodClass);
3800 }
3802 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3803 resultInfo.checkContext.inferenceContext());
3804 } catch (Infer.InferenceException ex) {
3805 //invalid target type - propagate exception outwards or report error
3806 //depending on the current check context
3807 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3808 return types.createErrorType(site);
3809 } catch (Resolve.InapplicableMethodException ex) {
3810 final JCDiagnostic diag = ex.getDiagnostic();
3811 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3812 @Override
3813 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3814 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3815 }
3816 };
3817 List<Type> argtypes2 = Type.map(argtypes,
3818 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3819 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3820 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3821 log.report(errDiag);
3822 return types.createErrorType(site);
3823 }
3824 }
3826 public void visitLiteral(JCLiteral tree) {
3827 result = check(
3828 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3829 }
3830 //where
3831 /** Return the type of a literal with given type tag.
3832 */
3833 Type litType(TypeTag tag) {
3834 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3835 }
3837 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3838 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3839 }
3841 public void visitTypeArray(JCArrayTypeTree tree) {
3842 Type etype = attribType(tree.elemtype, env);
3843 Type type = new ArrayType(etype, syms.arrayClass);
3844 result = check(tree, type, TYP, resultInfo);
3845 }
3847 /** Visitor method for parameterized types.
3848 * Bound checking is left until later, since types are attributed
3849 * before supertype structure is completely known
3850 */
3851 public void visitTypeApply(JCTypeApply tree) {
3852 Type owntype = types.createErrorType(tree.type);
3854 // Attribute functor part of application and make sure it's a class.
3855 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3857 // Attribute type parameters
3858 List<Type> actuals = attribTypes(tree.arguments, env);
3860 if (clazztype.hasTag(CLASS)) {
3861 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3862 if (actuals.isEmpty()) //diamond
3863 actuals = formals;
3865 if (actuals.length() == formals.length()) {
3866 List<Type> a = actuals;
3867 List<Type> f = formals;
3868 while (a.nonEmpty()) {
3869 a.head = a.head.withTypeVar(f.head);
3870 a = a.tail;
3871 f = f.tail;
3872 }
3873 // Compute the proper generic outer
3874 Type clazzOuter = clazztype.getEnclosingType();
3875 if (clazzOuter.hasTag(CLASS)) {
3876 Type site;
3877 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3878 if (clazz.hasTag(IDENT)) {
3879 site = env.enclClass.sym.type;
3880 } else if (clazz.hasTag(SELECT)) {
3881 site = ((JCFieldAccess) clazz).selected.type;
3882 } else throw new AssertionError(""+tree);
3883 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3884 if (site.hasTag(CLASS))
3885 site = types.asOuterSuper(site, clazzOuter.tsym);
3886 if (site == null)
3887 site = types.erasure(clazzOuter);
3888 clazzOuter = site;
3889 }
3890 }
3891 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3892 if (clazztype.isAnnotated()) {
3893 // Use the same AnnotatedType, because it will have
3894 // its annotations set later.
3895 ((AnnotatedType)clazztype).underlyingType = owntype;
3896 owntype = clazztype;
3897 }
3898 } else {
3899 if (formals.length() != 0) {
3900 log.error(tree.pos(), "wrong.number.type.args",
3901 Integer.toString(formals.length()));
3902 } else {
3903 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3904 }
3905 owntype = types.createErrorType(tree.type);
3906 }
3907 }
3908 result = check(tree, owntype, TYP, resultInfo);
3909 }
3911 public void visitTypeUnion(JCTypeUnion tree) {
3912 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3913 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3914 for (JCExpression typeTree : tree.alternatives) {
3915 Type ctype = attribType(typeTree, env);
3916 ctype = chk.checkType(typeTree.pos(),
3917 chk.checkClassType(typeTree.pos(), ctype),
3918 syms.throwableType);
3919 if (!ctype.isErroneous()) {
3920 //check that alternatives of a union type are pairwise
3921 //unrelated w.r.t. subtyping
3922 if (chk.intersects(ctype, multicatchTypes.toList())) {
3923 for (Type t : multicatchTypes) {
3924 boolean sub = types.isSubtype(ctype, t);
3925 boolean sup = types.isSubtype(t, ctype);
3926 if (sub || sup) {
3927 //assume 'a' <: 'b'
3928 Type a = sub ? ctype : t;
3929 Type b = sub ? t : ctype;
3930 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3931 }
3932 }
3933 }
3934 multicatchTypes.append(ctype);
3935 if (all_multicatchTypes != null)
3936 all_multicatchTypes.append(ctype);
3937 } else {
3938 if (all_multicatchTypes == null) {
3939 all_multicatchTypes = new ListBuffer<>();
3940 all_multicatchTypes.appendList(multicatchTypes);
3941 }
3942 all_multicatchTypes.append(ctype);
3943 }
3944 }
3945 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3946 if (t.hasTag(CLASS)) {
3947 List<Type> alternatives =
3948 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3949 t = new UnionClassType((ClassType) t, alternatives);
3950 }
3951 tree.type = result = t;
3952 }
3954 public void visitTypeIntersection(JCTypeIntersection tree) {
3955 attribTypes(tree.bounds, env);
3956 tree.type = result = checkIntersection(tree, tree.bounds);
3957 }
3959 public void visitTypeParameter(JCTypeParameter tree) {
3960 TypeVar typeVar = (TypeVar) tree.type;
3962 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3963 AnnotatedType antype = new AnnotatedType(typeVar);
3964 annotateType(antype, tree.annotations);
3965 tree.type = antype;
3966 }
3968 if (!typeVar.bound.isErroneous()) {
3969 //fixup type-parameter bound computed in 'attribTypeVariables'
3970 typeVar.bound = checkIntersection(tree, tree.bounds);
3971 }
3972 }
3974 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3975 Set<Type> boundSet = new HashSet<Type>();
3976 if (bounds.nonEmpty()) {
3977 // accept class or interface or typevar as first bound.
3978 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3979 boundSet.add(types.erasure(bounds.head.type));
3980 if (bounds.head.type.isErroneous()) {
3981 return bounds.head.type;
3982 }
3983 else if (bounds.head.type.hasTag(TYPEVAR)) {
3984 // if first bound was a typevar, do not accept further bounds.
3985 if (bounds.tail.nonEmpty()) {
3986 log.error(bounds.tail.head.pos(),
3987 "type.var.may.not.be.followed.by.other.bounds");
3988 return bounds.head.type;
3989 }
3990 } else {
3991 // if first bound was a class or interface, accept only interfaces
3992 // as further bounds.
3993 for (JCExpression bound : bounds.tail) {
3994 bound.type = checkBase(bound.type, bound, env, false, true, false);
3995 if (bound.type.isErroneous()) {
3996 bounds = List.of(bound);
3997 }
3998 else if (bound.type.hasTag(CLASS)) {
3999 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4000 }
4001 }
4002 }
4003 }
4005 if (bounds.length() == 0) {
4006 return syms.objectType;
4007 } else if (bounds.length() == 1) {
4008 return bounds.head.type;
4009 } else {
4010 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
4011 if (tree.hasTag(TYPEINTERSECTION)) {
4012 ((IntersectionClassType)owntype).intersectionKind =
4013 IntersectionClassType.IntersectionKind.EXPLICIT;
4014 }
4015 // ... the variable's bound is a class type flagged COMPOUND
4016 // (see comment for TypeVar.bound).
4017 // In this case, generate a class tree that represents the
4018 // bound class, ...
4019 JCExpression extending;
4020 List<JCExpression> implementing;
4021 if (!bounds.head.type.isInterface()) {
4022 extending = bounds.head;
4023 implementing = bounds.tail;
4024 } else {
4025 extending = null;
4026 implementing = bounds;
4027 }
4028 JCClassDecl cd = make.at(tree).ClassDef(
4029 make.Modifiers(PUBLIC | ABSTRACT),
4030 names.empty, List.<JCTypeParameter>nil(),
4031 extending, implementing, List.<JCTree>nil());
4033 ClassSymbol c = (ClassSymbol)owntype.tsym;
4034 Assert.check((c.flags() & COMPOUND) != 0);
4035 cd.sym = c;
4036 c.sourcefile = env.toplevel.sourcefile;
4038 // ... and attribute the bound class
4039 c.flags_field |= UNATTRIBUTED;
4040 Env<AttrContext> cenv = enter.classEnv(cd, env);
4041 enter.typeEnvs.put(c, cenv);
4042 attribClass(c);
4043 return owntype;
4044 }
4045 }
4047 public void visitWildcard(JCWildcard tree) {
4048 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4049 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4050 ? syms.objectType
4051 : attribType(tree.inner, env);
4052 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4053 tree.kind.kind,
4054 syms.boundClass),
4055 TYP, resultInfo);
4056 }
4058 public void visitAnnotation(JCAnnotation tree) {
4059 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
4060 result = tree.type = syms.errType;
4061 }
4063 public void visitAnnotatedType(JCAnnotatedType tree) {
4064 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4065 this.attribAnnotationTypes(tree.annotations, env);
4066 AnnotatedType antype = new AnnotatedType(underlyingType);
4067 annotateType(antype, tree.annotations);
4068 result = tree.type = antype;
4069 }
4071 /**
4072 * Apply the annotations to the particular type.
4073 */
4074 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
4075 if (annotations.isEmpty())
4076 return;
4077 annotate.typeAnnotation(new Annotate.Annotator() {
4078 @Override
4079 public String toString() {
4080 return "annotate " + annotations + " onto " + type;
4081 }
4082 @Override
4083 public void enterAnnotation() {
4084 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4085 type.typeAnnotations = compounds;
4086 }
4087 });
4088 }
4090 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4091 if (annotations.isEmpty())
4092 return List.nil();
4094 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4095 for (JCAnnotation anno : annotations) {
4096 if (anno.attribute != null) {
4097 // TODO: this null-check is only needed for an obscure
4098 // ordering issue, where annotate.flush is called when
4099 // the attribute is not set yet. For an example failure
4100 // try the referenceinfos/NestedTypes.java test.
4101 // Any better solutions?
4102 buf.append((Attribute.TypeCompound) anno.attribute);
4103 }
4104 }
4105 return buf.toList();
4106 }
4108 public void visitErroneous(JCErroneous tree) {
4109 if (tree.errs != null)
4110 for (JCTree err : tree.errs)
4111 attribTree(err, env, new ResultInfo(ERR, pt()));
4112 result = tree.type = syms.errType;
4113 }
4115 /** Default visitor method for all other trees.
4116 */
4117 public void visitTree(JCTree tree) {
4118 throw new AssertionError();
4119 }
4121 /**
4122 * Attribute an env for either a top level tree or class declaration.
4123 */
4124 public void attrib(Env<AttrContext> env) {
4125 if (env.tree.hasTag(TOPLEVEL))
4126 attribTopLevel(env);
4127 else
4128 attribClass(env.tree.pos(), env.enclClass.sym);
4129 }
4131 /**
4132 * Attribute a top level tree. These trees are encountered when the
4133 * package declaration has annotations.
4134 */
4135 public void attribTopLevel(Env<AttrContext> env) {
4136 JCCompilationUnit toplevel = env.toplevel;
4137 try {
4138 annotate.flush();
4139 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
4140 } catch (CompletionFailure ex) {
4141 chk.completionError(toplevel.pos(), ex);
4142 }
4143 }
4145 /** Main method: attribute class definition associated with given class symbol.
4146 * reporting completion failures at the given position.
4147 * @param pos The source position at which completion errors are to be
4148 * reported.
4149 * @param c The class symbol whose definition will be attributed.
4150 */
4151 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4152 try {
4153 annotate.flush();
4154 attribClass(c);
4155 } catch (CompletionFailure ex) {
4156 chk.completionError(pos, ex);
4157 }
4158 }
4160 /** Attribute class definition associated with given class symbol.
4161 * @param c The class symbol whose definition will be attributed.
4162 */
4163 void attribClass(ClassSymbol c) throws CompletionFailure {
4164 if (c.type.hasTag(ERROR)) return;
4166 // Check for cycles in the inheritance graph, which can arise from
4167 // ill-formed class files.
4168 chk.checkNonCyclic(null, c.type);
4170 Type st = types.supertype(c.type);
4171 if ((c.flags_field & Flags.COMPOUND) == 0) {
4172 // First, attribute superclass.
4173 if (st.hasTag(CLASS))
4174 attribClass((ClassSymbol)st.tsym);
4176 // Next attribute owner, if it is a class.
4177 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4178 attribClass((ClassSymbol)c.owner);
4179 }
4181 // The previous operations might have attributed the current class
4182 // if there was a cycle. So we test first whether the class is still
4183 // UNATTRIBUTED.
4184 if ((c.flags_field & UNATTRIBUTED) != 0) {
4185 c.flags_field &= ~UNATTRIBUTED;
4187 // Get environment current at the point of class definition.
4188 Env<AttrContext> env = enter.typeEnvs.get(c);
4190 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4191 // because the annotations were not available at the time the env was created. Therefore,
4192 // we look up the environment chain for the first enclosing environment for which the
4193 // lint value is set. Typically, this is the parent env, but might be further if there
4194 // are any envs created as a result of TypeParameter nodes.
4195 Env<AttrContext> lintEnv = env;
4196 while (lintEnv.info.lint == null)
4197 lintEnv = lintEnv.next;
4199 // Having found the enclosing lint value, we can initialize the lint value for this class
4200 env.info.lint = lintEnv.info.lint.augment(c);
4202 Lint prevLint = chk.setLint(env.info.lint);
4203 JavaFileObject prev = log.useSource(c.sourcefile);
4204 ResultInfo prevReturnRes = env.info.returnResult;
4206 try {
4207 deferredLintHandler.flush(env.tree);
4208 env.info.returnResult = null;
4209 // java.lang.Enum may not be subclassed by a non-enum
4210 if (st.tsym == syms.enumSym &&
4211 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4212 log.error(env.tree.pos(), "enum.no.subclassing");
4214 // Enums may not be extended by source-level classes
4215 if (st.tsym != null &&
4216 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4217 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4218 log.error(env.tree.pos(), "enum.types.not.extensible");
4219 }
4220 attribClassBody(env, c);
4222 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4223 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4224 } finally {
4225 env.info.returnResult = prevReturnRes;
4226 log.useSource(prev);
4227 chk.setLint(prevLint);
4228 }
4230 }
4231 }
4233 public void visitImport(JCImport tree) {
4234 // nothing to do
4235 }
4237 /** Finish the attribution of a class. */
4238 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4239 JCClassDecl tree = (JCClassDecl)env.tree;
4240 Assert.check(c == tree.sym);
4242 // Validate annotations
4243 chk.validateAnnotations(tree.mods.annotations, c);
4245 // Validate type parameters, supertype and interfaces.
4246 attribStats(tree.typarams, env);
4247 if (!c.isAnonymous()) {
4248 //already checked if anonymous
4249 chk.validate(tree.typarams, env);
4250 chk.validate(tree.extending, env);
4251 chk.validate(tree.implementing, env);
4252 }
4254 // If this is a non-abstract class, check that it has no abstract
4255 // methods or unimplemented methods of an implemented interface.
4256 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4257 if (!relax)
4258 chk.checkAllDefined(tree.pos(), c);
4259 }
4261 if ((c.flags() & ANNOTATION) != 0) {
4262 if (tree.implementing.nonEmpty())
4263 log.error(tree.implementing.head.pos(),
4264 "cant.extend.intf.annotation");
4265 if (tree.typarams.nonEmpty())
4266 log.error(tree.typarams.head.pos(),
4267 "intf.annotation.cant.have.type.params");
4269 // If this annotation has a @Repeatable, validate
4270 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4271 if (repeatable != null) {
4272 // get diagnostic position for error reporting
4273 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4274 Assert.checkNonNull(cbPos);
4276 chk.validateRepeatable(c, repeatable, cbPos);
4277 }
4278 } else {
4279 // Check that all extended classes and interfaces
4280 // are compatible (i.e. no two define methods with same arguments
4281 // yet different return types). (JLS 8.4.6.3)
4282 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4283 if (allowDefaultMethods) {
4284 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4285 }
4286 }
4288 // Check that class does not import the same parameterized interface
4289 // with two different argument lists.
4290 chk.checkClassBounds(tree.pos(), c.type);
4292 tree.type = c.type;
4294 for (List<JCTypeParameter> l = tree.typarams;
4295 l.nonEmpty(); l = l.tail) {
4296 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4297 }
4299 // Check that a generic class doesn't extend Throwable
4300 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4301 log.error(tree.extending.pos(), "generic.throwable");
4303 // Check that all methods which implement some
4304 // method conform to the method they implement.
4305 chk.checkImplementations(tree);
4307 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4308 checkAutoCloseable(tree.pos(), env, c.type);
4310 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4311 // Attribute declaration
4312 attribStat(l.head, env);
4313 // Check that declarations in inner classes are not static (JLS 8.1.2)
4314 // Make an exception for static constants.
4315 if (c.owner.kind != PCK &&
4316 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4317 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4318 Symbol sym = null;
4319 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4320 if (sym == null ||
4321 sym.kind != VAR ||
4322 ((VarSymbol) sym).getConstValue() == null)
4323 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4324 }
4325 }
4327 // Check for cycles among non-initial constructors.
4328 chk.checkCyclicConstructors(tree);
4330 // Check for cycles among annotation elements.
4331 chk.checkNonCyclicElements(tree);
4333 // Check for proper use of serialVersionUID
4334 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4335 isSerializable(c) &&
4336 (c.flags() & Flags.ENUM) == 0 &&
4337 checkForSerial(c)) {
4338 checkSerialVersionUID(tree, c);
4339 }
4340 if (allowTypeAnnos) {
4341 // Correctly organize the postions of the type annotations
4342 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4344 // Check type annotations applicability rules
4345 validateTypeAnnotations(tree);
4346 }
4347 }
4348 // where
4349 boolean checkForSerial(ClassSymbol c) {
4350 if ((c.flags() & ABSTRACT) == 0) {
4351 return true;
4352 } else {
4353 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4354 }
4355 }
4357 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4358 @Override
4359 public boolean accepts(Symbol s) {
4360 return s.kind == Kinds.MTH &&
4361 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4362 }
4363 };
4365 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4366 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4367 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4368 if (types.isSameType(al.head.annotationType.type, t))
4369 return al.head.pos();
4370 }
4372 return null;
4373 }
4375 /** check if a class is a subtype of Serializable, if that is available. */
4376 private boolean isSerializable(ClassSymbol c) {
4377 try {
4378 syms.serializableType.complete();
4379 }
4380 catch (CompletionFailure e) {
4381 return false;
4382 }
4383 return types.isSubtype(c.type, syms.serializableType);
4384 }
4386 /** Check that an appropriate serialVersionUID member is defined. */
4387 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4389 // check for presence of serialVersionUID
4390 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4391 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4392 if (e.scope == null) {
4393 log.warning(LintCategory.SERIAL,
4394 tree.pos(), "missing.SVUID", c);
4395 return;
4396 }
4398 // check that it is static final
4399 VarSymbol svuid = (VarSymbol)e.sym;
4400 if ((svuid.flags() & (STATIC | FINAL)) !=
4401 (STATIC | FINAL))
4402 log.warning(LintCategory.SERIAL,
4403 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4405 // check that it is long
4406 else if (!svuid.type.hasTag(LONG))
4407 log.warning(LintCategory.SERIAL,
4408 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4410 // check constant
4411 else if (svuid.getConstValue() == null)
4412 log.warning(LintCategory.SERIAL,
4413 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4414 }
4416 private Type capture(Type type) {
4417 return types.capture(type);
4418 }
4420 private void validateTypeAnnotations(JCTree tree) {
4421 tree.accept(typeAnnotationsValidator);
4422 }
4423 //where
4424 private final JCTree.Visitor typeAnnotationsValidator = new TreeScanner() {
4426 private boolean checkAllAnnotations = false;
4428 public void visitAnnotation(JCAnnotation tree) {
4429 if (tree.hasTag(TYPE_ANNOTATION) || checkAllAnnotations) {
4430 chk.validateTypeAnnotation(tree, false);
4431 }
4432 super.visitAnnotation(tree);
4433 }
4434 public void visitTypeParameter(JCTypeParameter tree) {
4435 chk.validateTypeAnnotations(tree.annotations, true);
4436 scan(tree.bounds);
4437 // Don't call super.
4438 // This is needed because above we call validateTypeAnnotation with
4439 // false, which would forbid annotations on type parameters.
4440 // super.visitTypeParameter(tree);
4441 }
4442 public void visitMethodDef(JCMethodDecl tree) {
4443 if (tree.recvparam != null &&
4444 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4445 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4446 tree.recvparam.vartype.type.tsym);
4447 }
4448 if (tree.restype != null && tree.restype.type != null) {
4449 validateAnnotatedType(tree.restype, tree.restype.type);
4450 }
4451 super.visitMethodDef(tree);
4452 }
4453 public void visitVarDef(final JCVariableDecl tree) {
4454 if (tree.sym != null && tree.sym.type != null)
4455 validateAnnotatedType(tree, tree.sym.type);
4456 super.visitVarDef(tree);
4457 }
4458 public void visitTypeCast(JCTypeCast tree) {
4459 if (tree.clazz != null && tree.clazz.type != null)
4460 validateAnnotatedType(tree.clazz, tree.clazz.type);
4461 super.visitTypeCast(tree);
4462 }
4463 public void visitTypeTest(JCInstanceOf tree) {
4464 if (tree.clazz != null && tree.clazz.type != null)
4465 validateAnnotatedType(tree.clazz, tree.clazz.type);
4466 super.visitTypeTest(tree);
4467 }
4468 public void visitNewClass(JCNewClass tree) {
4469 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4470 boolean prevCheck = this.checkAllAnnotations;
4471 try {
4472 this.checkAllAnnotations = true;
4473 scan(((JCAnnotatedType)tree.clazz).annotations);
4474 } finally {
4475 this.checkAllAnnotations = prevCheck;
4476 }
4477 }
4478 super.visitNewClass(tree);
4479 }
4480 public void visitNewArray(JCNewArray tree) {
4481 if (tree.elemtype != null && tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4482 boolean prevCheck = this.checkAllAnnotations;
4483 try {
4484 this.checkAllAnnotations = true;
4485 scan(((JCAnnotatedType)tree.elemtype).annotations);
4486 } finally {
4487 this.checkAllAnnotations = prevCheck;
4488 }
4489 }
4490 super.visitNewArray(tree);
4491 }
4493 /* I would want to model this after
4494 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4495 * and override visitSelect and visitTypeApply.
4496 * However, we only set the annotated type in the top-level type
4497 * of the symbol.
4498 * Therefore, we need to override each individual location where a type
4499 * can occur.
4500 */
4501 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4502 if (type.getEnclosingType() != null &&
4503 type != type.getEnclosingType()) {
4504 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4505 }
4506 for (Type targ : type.getTypeArguments()) {
4507 validateAnnotatedType(errtree, targ);
4508 }
4509 }
4510 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4511 validateAnnotatedType(errtree, type);
4512 if (type.tsym != null &&
4513 type.tsym.isStatic() &&
4514 type.getAnnotationMirrors().nonEmpty()) {
4515 // Enclosing static classes cannot have type annotations.
4516 log.error(errtree.pos(), "cant.annotate.static.class");
4517 }
4518 }
4519 };
4521 // <editor-fold desc="post-attribution visitor">
4523 /**
4524 * Handle missing types/symbols in an AST. This routine is useful when
4525 * the compiler has encountered some errors (which might have ended up
4526 * terminating attribution abruptly); if the compiler is used in fail-over
4527 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4528 * prevents NPE to be progagated during subsequent compilation steps.
4529 */
4530 public void postAttr(JCTree tree) {
4531 new PostAttrAnalyzer().scan(tree);
4532 }
4534 class PostAttrAnalyzer extends TreeScanner {
4536 private void initTypeIfNeeded(JCTree that) {
4537 if (that.type == null) {
4538 that.type = syms.unknownType;
4539 }
4540 }
4542 @Override
4543 public void scan(JCTree tree) {
4544 if (tree == null) return;
4545 if (tree instanceof JCExpression) {
4546 initTypeIfNeeded(tree);
4547 }
4548 super.scan(tree);
4549 }
4551 @Override
4552 public void visitIdent(JCIdent that) {
4553 if (that.sym == null) {
4554 that.sym = syms.unknownSymbol;
4555 }
4556 }
4558 @Override
4559 public void visitSelect(JCFieldAccess that) {
4560 if (that.sym == null) {
4561 that.sym = syms.unknownSymbol;
4562 }
4563 super.visitSelect(that);
4564 }
4566 @Override
4567 public void visitClassDef(JCClassDecl that) {
4568 initTypeIfNeeded(that);
4569 if (that.sym == null) {
4570 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4571 }
4572 super.visitClassDef(that);
4573 }
4575 @Override
4576 public void visitMethodDef(JCMethodDecl that) {
4577 initTypeIfNeeded(that);
4578 if (that.sym == null) {
4579 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4580 }
4581 super.visitMethodDef(that);
4582 }
4584 @Override
4585 public void visitVarDef(JCVariableDecl that) {
4586 initTypeIfNeeded(that);
4587 if (that.sym == null) {
4588 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4589 that.sym.adr = 0;
4590 }
4591 super.visitVarDef(that);
4592 }
4594 @Override
4595 public void visitNewClass(JCNewClass that) {
4596 if (that.constructor == null) {
4597 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4598 }
4599 if (that.constructorType == null) {
4600 that.constructorType = syms.unknownType;
4601 }
4602 super.visitNewClass(that);
4603 }
4605 @Override
4606 public void visitAssignop(JCAssignOp that) {
4607 if (that.operator == null)
4608 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4609 super.visitAssignop(that);
4610 }
4612 @Override
4613 public void visitBinary(JCBinary that) {
4614 if (that.operator == null)
4615 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4616 super.visitBinary(that);
4617 }
4619 @Override
4620 public void visitUnary(JCUnary that) {
4621 if (that.operator == null)
4622 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4623 super.visitUnary(that);
4624 }
4626 @Override
4627 public void visitLambda(JCLambda that) {
4628 super.visitLambda(that);
4629 if (that.targets == null) {
4630 that.targets = List.nil();
4631 }
4632 }
4634 @Override
4635 public void visitReference(JCMemberReference that) {
4636 super.visitReference(that);
4637 if (that.sym == null) {
4638 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4639 }
4640 if (that.targets == null) {
4641 that.targets = List.nil();
4642 }
4643 }
4644 }
4645 // </editor-fold>
4646 }
