Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@0e026d3f2786
src/share/classes/com/sun/tools/javac/comp/Attr.java
Tue, 27 May 2014 17:30:48 -0600
- author
- dlsmith
- date
- Tue, 27 May 2014 17:30:48 -0600
- changeset 2400
- 0e026d3f2786
- parent 2399
- f4254623c54e
- child 2412
- bf8edbcae43a
- permissions
- -rw-r--r--
8042338: Refactor Types.upperBound to treat wildcards and variables separately
Reviewed-by: vromero
1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.tools.JavaFileObject;
33 import com.sun.source.tree.IdentifierTree;
34 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
35 import com.sun.source.tree.MemberSelectTree;
36 import com.sun.source.tree.TreeVisitor;
37 import com.sun.source.util.SimpleTreeVisitor;
38 import com.sun.tools.javac.code.*;
39 import com.sun.tools.javac.code.Lint.LintCategory;
40 import com.sun.tools.javac.code.Symbol.*;
41 import com.sun.tools.javac.code.Type.*;
42 import com.sun.tools.javac.comp.Check.CheckContext;
43 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
44 import com.sun.tools.javac.comp.Infer.InferenceContext;
45 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
46 import com.sun.tools.javac.jvm.*;
47 import com.sun.tools.javac.tree.*;
48 import com.sun.tools.javac.tree.JCTree.*;
49 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
50 import com.sun.tools.javac.util.*;
51 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
52 import com.sun.tools.javac.util.List;
53 import static com.sun.tools.javac.code.Flags.*;
54 import static com.sun.tools.javac.code.Flags.ANNOTATION;
55 import static com.sun.tools.javac.code.Flags.BLOCK;
56 import static com.sun.tools.javac.code.Kinds.*;
57 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
58 import static com.sun.tools.javac.code.TypeTag.*;
59 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
60 import static com.sun.tools.javac.tree.JCTree.Tag.*;
62 /** This is the main context-dependent analysis phase in GJC. It
63 * encompasses name resolution, type checking and constant folding as
64 * subtasks. Some subtasks involve auxiliary classes.
65 * @see Check
66 * @see Resolve
67 * @see ConstFold
68 * @see Infer
69 *
70 * <p><b>This is NOT part of any supported API.
71 * If you write code that depends on this, you do so at your own risk.
72 * This code and its internal interfaces are subject to change or
73 * deletion without notice.</b>
74 */
75 public class Attr extends JCTree.Visitor {
76 protected static final Context.Key<Attr> attrKey =
77 new Context.Key<Attr>();
79 final Names names;
80 final Log log;
81 final Symtab syms;
82 final Resolve rs;
83 final Infer infer;
84 final DeferredAttr deferredAttr;
85 final Check chk;
86 final Flow flow;
87 final MemberEnter memberEnter;
88 final TreeMaker make;
89 final ConstFold cfolder;
90 final Enter enter;
91 final Target target;
92 final Types types;
93 final JCDiagnostic.Factory diags;
94 final Annotate annotate;
95 final TypeAnnotations typeAnnotations;
96 final DeferredLintHandler deferredLintHandler;
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 typeAnnotations = TypeAnnotations.instance(context);
125 deferredLintHandler = DeferredLintHandler.instance(context);
127 Options options = Options.instance(context);
129 Source source = Source.instance(context);
130 allowGenerics = source.allowGenerics();
131 allowVarargs = source.allowVarargs();
132 allowEnums = source.allowEnums();
133 allowBoxing = source.allowBoxing();
134 allowCovariantReturns = source.allowCovariantReturns();
135 allowAnonOuterThis = source.allowAnonOuterThis();
136 allowStringsInSwitch = source.allowStringsInSwitch();
137 allowPoly = source.allowPoly();
138 allowTypeAnnos = source.allowTypeAnnotations();
139 allowLambda = source.allowLambda();
140 allowDefaultMethods = source.allowDefaultMethods();
141 sourceName = source.name;
142 relax = (options.isSet("-retrofit") ||
143 options.isSet("-relax"));
144 findDiamonds = options.get("findDiamond") != null &&
145 source.allowDiamond();
146 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
147 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
149 statInfo = new ResultInfo(NIL, Type.noType);
150 varInfo = new ResultInfo(VAR, Type.noType);
151 unknownExprInfo = new ResultInfo(VAL, Type.noType);
152 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
153 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
154 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
155 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
156 }
158 /** Switch: relax some constraints for retrofit mode.
159 */
160 boolean relax;
162 /** Switch: support target-typing inference
163 */
164 boolean allowPoly;
166 /** Switch: support type annotations.
167 */
168 boolean allowTypeAnnos;
170 /** Switch: support generics?
171 */
172 boolean allowGenerics;
174 /** Switch: allow variable-arity methods.
175 */
176 boolean allowVarargs;
178 /** Switch: support enums?
179 */
180 boolean allowEnums;
182 /** Switch: support boxing and unboxing?
183 */
184 boolean allowBoxing;
186 /** Switch: support covariant result types?
187 */
188 boolean allowCovariantReturns;
190 /** Switch: support lambda expressions ?
191 */
192 boolean allowLambda;
194 /** Switch: support default methods ?
195 */
196 boolean allowDefaultMethods;
198 /** Switch: allow references to surrounding object from anonymous
199 * objects during constructor call?
200 */
201 boolean allowAnonOuterThis;
203 /** Switch: generates a warning if diamond can be safely applied
204 * to a given new expression
205 */
206 boolean findDiamonds;
208 /**
209 * Internally enables/disables diamond finder feature
210 */
211 static final boolean allowDiamondFinder = true;
213 /**
214 * Switch: warn about use of variable before declaration?
215 * RFE: 6425594
216 */
217 boolean useBeforeDeclarationWarning;
219 /**
220 * Switch: generate warnings whenever an anonymous inner class that is convertible
221 * to a lambda expression is found
222 */
223 boolean identifyLambdaCandidate;
225 /**
226 * Switch: allow strings in switch?
227 */
228 boolean allowStringsInSwitch;
230 /**
231 * Switch: name of source level; used for error reporting.
232 */
233 String sourceName;
235 /** Check kind and type of given tree against protokind and prototype.
236 * If check succeeds, store type in tree and return it.
237 * If check fails, store errType in tree and return it.
238 * No checks are performed if the prototype is a method type.
239 * It is not necessary in this case since we know that kind and type
240 * are correct.
241 *
242 * @param tree The tree whose kind and type is checked
243 * @param ownkind The computed kind of the tree
244 * @param resultInfo The expected result of the tree
245 */
246 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
247 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
248 Type owntype = found;
249 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
250 if (allowPoly && inferenceContext.free(found)) {
251 if ((ownkind & ~resultInfo.pkind) == 0) {
252 owntype = resultInfo.check(tree, inferenceContext.asUndetVar(owntype));
253 } else {
254 log.error(tree.pos(), "unexpected.type",
255 kindNames(resultInfo.pkind),
256 kindName(ownkind));
257 owntype = types.createErrorType(owntype);
258 }
259 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
260 @Override
261 public void typesInferred(InferenceContext inferenceContext) {
262 ResultInfo pendingResult =
263 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
264 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
265 }
266 });
267 return tree.type = resultInfo.pt;
268 } else {
269 if ((ownkind & ~resultInfo.pkind) == 0) {
270 owntype = resultInfo.check(tree, owntype);
271 } else {
272 log.error(tree.pos(), "unexpected.type",
273 kindNames(resultInfo.pkind),
274 kindName(ownkind));
275 owntype = types.createErrorType(owntype);
276 }
277 }
278 }
279 tree.type = owntype;
280 return owntype;
281 }
283 /** Is given blank final variable assignable, i.e. in a scope where it
284 * may be assigned to even though it is final?
285 * @param v The blank final variable.
286 * @param env The current environment.
287 */
288 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
289 Symbol owner = owner(env);
290 // owner refers to the innermost variable, method or
291 // initializer block declaration at this point.
292 return
293 v.owner == owner
294 ||
295 ((owner.name == names.init || // i.e. we are in a constructor
296 owner.kind == VAR || // i.e. we are in a variable initializer
297 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
298 &&
299 v.owner == owner.owner
300 &&
301 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
302 }
304 /**
305 * Return the innermost enclosing owner symbol in a given attribution context
306 */
307 Symbol owner(Env<AttrContext> env) {
308 while (true) {
309 switch (env.tree.getTag()) {
310 case VARDEF:
311 //a field can be owner
312 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
313 if (vsym.owner.kind == TYP) {
314 return vsym;
315 }
316 break;
317 case METHODDEF:
318 //method def is always an owner
319 return ((JCMethodDecl)env.tree).sym;
320 case CLASSDEF:
321 //class def is always an owner
322 return ((JCClassDecl)env.tree).sym;
323 case BLOCK:
324 //static/instance init blocks are owner
325 Symbol blockSym = env.info.scope.owner;
326 if ((blockSym.flags() & BLOCK) != 0) {
327 return blockSym;
328 }
329 break;
330 case TOPLEVEL:
331 //toplevel is always an owner (for pkge decls)
332 return env.info.scope.owner;
333 }
334 Assert.checkNonNull(env.next);
335 env = env.next;
336 }
337 }
339 /** Check that variable can be assigned to.
340 * @param pos The current source code position.
341 * @param v The assigned varaible
342 * @param base If the variable is referred to in a Select, the part
343 * to the left of the `.', null otherwise.
344 * @param env The current environment.
345 */
346 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
347 if ((v.flags() & FINAL) != 0 &&
348 ((v.flags() & HASINIT) != 0
349 ||
350 !((base == null ||
351 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
352 isAssignableAsBlankFinal(v, env)))) {
353 if (v.isResourceVariable()) { //TWR resource
354 log.error(pos, "try.resource.may.not.be.assigned", v);
355 } else {
356 log.error(pos, "cant.assign.val.to.final.var", v);
357 }
358 }
359 }
361 /** Does tree represent a static reference to an identifier?
362 * It is assumed that tree is either a SELECT or an IDENT.
363 * We have to weed out selects from non-type names here.
364 * @param tree The candidate tree.
365 */
366 boolean isStaticReference(JCTree tree) {
367 if (tree.hasTag(SELECT)) {
368 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
369 if (lsym == null || lsym.kind != TYP) {
370 return false;
371 }
372 }
373 return true;
374 }
376 /** Is this symbol a type?
377 */
378 static boolean isType(Symbol sym) {
379 return sym != null && sym.kind == TYP;
380 }
382 /** The current `this' symbol.
383 * @param env The current environment.
384 */
385 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
386 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
387 }
389 /** Attribute a parsed identifier.
390 * @param tree Parsed identifier name
391 * @param topLevel The toplevel to use
392 */
393 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
394 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
395 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
396 syms.errSymbol.name,
397 null, null, null, null);
398 localEnv.enclClass.sym = syms.errSymbol;
399 return tree.accept(identAttributer, localEnv);
400 }
401 // where
402 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
403 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
404 @Override
405 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
406 Symbol site = visit(node.getExpression(), env);
407 if (site.kind == ERR || site.kind == ABSENT_TYP)
408 return site;
409 Name name = (Name)node.getIdentifier();
410 if (site.kind == PCK) {
411 env.toplevel.packge = (PackageSymbol)site;
412 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
413 } else {
414 env.enclClass.sym = (ClassSymbol)site;
415 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
416 }
417 }
419 @Override
420 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
421 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
422 }
423 }
425 public Type coerce(Type etype, Type ttype) {
426 return cfolder.coerce(etype, ttype);
427 }
429 public Type attribType(JCTree node, TypeSymbol sym) {
430 Env<AttrContext> env = enter.typeEnvs.get(sym);
431 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
432 return attribTree(node, localEnv, unknownTypeInfo);
433 }
435 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
436 // Attribute qualifying package or class.
437 JCFieldAccess s = (JCFieldAccess)tree.qualid;
438 return attribTree(s.selected,
439 env,
440 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
441 Type.noType));
442 }
444 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
445 breakTree = tree;
446 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
447 try {
448 attribExpr(expr, env);
449 } catch (BreakAttr b) {
450 return b.env;
451 } catch (AssertionError ae) {
452 if (ae.getCause() instanceof BreakAttr) {
453 return ((BreakAttr)(ae.getCause())).env;
454 } else {
455 throw ae;
456 }
457 } finally {
458 breakTree = null;
459 log.useSource(prev);
460 }
461 return env;
462 }
464 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
465 breakTree = tree;
466 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
467 try {
468 attribStat(stmt, env);
469 } catch (BreakAttr b) {
470 return b.env;
471 } catch (AssertionError ae) {
472 if (ae.getCause() instanceof BreakAttr) {
473 return ((BreakAttr)(ae.getCause())).env;
474 } else {
475 throw ae;
476 }
477 } finally {
478 breakTree = null;
479 log.useSource(prev);
480 }
481 return env;
482 }
484 private JCTree breakTree = null;
486 private static class BreakAttr extends RuntimeException {
487 static final long serialVersionUID = -6924771130405446405L;
488 private Env<AttrContext> env;
489 private BreakAttr(Env<AttrContext> env) {
490 this.env = env;
491 }
492 }
494 class ResultInfo {
495 final int pkind;
496 final Type pt;
497 final CheckContext checkContext;
499 ResultInfo(int pkind, Type pt) {
500 this(pkind, pt, chk.basicHandler);
501 }
503 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
504 this.pkind = pkind;
505 this.pt = pt;
506 this.checkContext = checkContext;
507 }
509 protected Type check(final DiagnosticPosition pos, final Type found) {
510 return chk.checkType(pos, found, pt, checkContext);
511 }
513 protected ResultInfo dup(Type newPt) {
514 return new ResultInfo(pkind, newPt, checkContext);
515 }
517 protected ResultInfo dup(CheckContext newContext) {
518 return new ResultInfo(pkind, pt, newContext);
519 }
521 protected ResultInfo dup(Type newPt, CheckContext newContext) {
522 return new ResultInfo(pkind, newPt, newContext);
523 }
525 @Override
526 public String toString() {
527 if (pt != null) {
528 return pt.toString();
529 } else {
530 return "";
531 }
532 }
533 }
535 class RecoveryInfo extends ResultInfo {
537 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
538 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
539 @Override
540 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
541 return deferredAttrContext;
542 }
543 @Override
544 public boolean compatible(Type found, Type req, Warner warn) {
545 return true;
546 }
547 @Override
548 public void report(DiagnosticPosition pos, JCDiagnostic details) {
549 chk.basicHandler.report(pos, details);
550 }
551 });
552 }
553 }
555 final ResultInfo statInfo;
556 final ResultInfo varInfo;
557 final ResultInfo unknownAnyPolyInfo;
558 final ResultInfo unknownExprInfo;
559 final ResultInfo unknownTypeInfo;
560 final ResultInfo unknownTypeExprInfo;
561 final ResultInfo recoveryInfo;
563 Type pt() {
564 return resultInfo.pt;
565 }
567 int pkind() {
568 return resultInfo.pkind;
569 }
571 /* ************************************************************************
572 * Visitor methods
573 *************************************************************************/
575 /** Visitor argument: the current environment.
576 */
577 Env<AttrContext> env;
579 /** Visitor argument: the currently expected attribution result.
580 */
581 ResultInfo resultInfo;
583 /** Visitor result: the computed type.
584 */
585 Type result;
587 /** Visitor method: attribute a tree, catching any completion failure
588 * exceptions. Return the tree's type.
589 *
590 * @param tree The tree to be visited.
591 * @param env The environment visitor argument.
592 * @param resultInfo The result info visitor argument.
593 */
594 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
595 Env<AttrContext> prevEnv = this.env;
596 ResultInfo prevResult = this.resultInfo;
597 try {
598 this.env = env;
599 this.resultInfo = resultInfo;
600 tree.accept(this);
601 if (tree == breakTree &&
602 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
603 throw new BreakAttr(copyEnv(env));
604 }
605 return result;
606 } catch (CompletionFailure ex) {
607 tree.type = syms.errType;
608 return chk.completionError(tree.pos(), ex);
609 } finally {
610 this.env = prevEnv;
611 this.resultInfo = prevResult;
612 }
613 }
615 Env<AttrContext> copyEnv(Env<AttrContext> env) {
616 Env<AttrContext> newEnv =
617 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
618 if (newEnv.outer != null) {
619 newEnv.outer = copyEnv(newEnv.outer);
620 }
621 return newEnv;
622 }
624 Scope copyScope(Scope sc) {
625 Scope newScope = new Scope(sc.owner);
626 List<Symbol> elemsList = List.nil();
627 while (sc != null) {
628 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
629 elemsList = elemsList.prepend(e.sym);
630 }
631 sc = sc.next;
632 }
633 for (Symbol s : elemsList) {
634 newScope.enter(s);
635 }
636 return newScope;
637 }
639 /** Derived visitor method: attribute an expression tree.
640 */
641 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
642 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
643 }
645 /** Derived visitor method: attribute an expression tree with
646 * no constraints on the computed type.
647 */
648 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
649 return attribTree(tree, env, unknownExprInfo);
650 }
652 /** Derived visitor method: attribute a type tree.
653 */
654 public Type attribType(JCTree tree, Env<AttrContext> env) {
655 Type result = attribType(tree, env, Type.noType);
656 return result;
657 }
659 /** Derived visitor method: attribute a type tree.
660 */
661 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
662 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
663 return result;
664 }
666 /** Derived visitor method: attribute a statement or definition tree.
667 */
668 public Type attribStat(JCTree tree, Env<AttrContext> env) {
669 return attribTree(tree, env, statInfo);
670 }
672 /** Attribute a list of expressions, returning a list of types.
673 */
674 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
675 ListBuffer<Type> ts = new ListBuffer<Type>();
676 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
677 ts.append(attribExpr(l.head, env, pt));
678 return ts.toList();
679 }
681 /** Attribute a list of statements, returning nothing.
682 */
683 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
684 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
685 attribStat(l.head, env);
686 }
688 /** Attribute the arguments in a method call, returning the method kind.
689 */
690 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
691 int kind = VAL;
692 for (JCExpression arg : trees) {
693 Type argtype;
694 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
695 argtype = deferredAttr.new DeferredType(arg, env);
696 kind |= POLY;
697 } else {
698 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
699 }
700 argtypes.append(argtype);
701 }
702 return kind;
703 }
705 /** Attribute a type argument list, returning a list of types.
706 * Caller is responsible for calling checkRefTypes.
707 */
708 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
709 ListBuffer<Type> argtypes = new ListBuffer<Type>();
710 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
711 argtypes.append(attribType(l.head, env));
712 return argtypes.toList();
713 }
715 /** Attribute a type argument list, returning a list of types.
716 * Check that all the types are references.
717 */
718 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
719 List<Type> types = attribAnyTypes(trees, env);
720 return chk.checkRefTypes(trees, types);
721 }
723 /**
724 * Attribute type variables (of generic classes or methods).
725 * Compound types are attributed later in attribBounds.
726 * @param typarams the type variables to enter
727 * @param env the current environment
728 */
729 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
730 for (JCTypeParameter tvar : typarams) {
731 TypeVar a = (TypeVar)tvar.type;
732 a.tsym.flags_field |= UNATTRIBUTED;
733 a.bound = Type.noType;
734 if (!tvar.bounds.isEmpty()) {
735 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
736 for (JCExpression bound : tvar.bounds.tail)
737 bounds = bounds.prepend(attribType(bound, env));
738 types.setBounds(a, bounds.reverse());
739 } else {
740 // if no bounds are given, assume a single bound of
741 // java.lang.Object.
742 types.setBounds(a, List.of(syms.objectType));
743 }
744 a.tsym.flags_field &= ~UNATTRIBUTED;
745 }
746 for (JCTypeParameter tvar : typarams) {
747 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
748 }
749 }
751 /**
752 * Attribute the type references in a list of annotations.
753 */
754 void attribAnnotationTypes(List<JCAnnotation> annotations,
755 Env<AttrContext> env) {
756 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
757 JCAnnotation a = al.head;
758 attribType(a.annotationType, env);
759 }
760 }
762 /**
763 * Attribute a "lazy constant value".
764 * @param env The env for the const value
765 * @param initializer The initializer for the const value
766 * @param type The expected type, or null
767 * @see VarSymbol#setLazyConstValue
768 */
769 public Object attribLazyConstantValue(Env<AttrContext> env,
770 JCVariableDecl variable,
771 Type type) {
773 DiagnosticPosition prevLintPos
774 = deferredLintHandler.setPos(variable.pos());
776 try {
777 // Use null as symbol to not attach the type annotation to any symbol.
778 // The initializer will later also be visited and then we'll attach
779 // to the symbol.
780 // This prevents having multiple type annotations, just because of
781 // lazy constant value evaluation.
782 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
783 annotate.flush();
784 Type itype = attribExpr(variable.init, env, type);
785 if (itype.constValue() != null) {
786 return coerce(itype, type).constValue();
787 } else {
788 return null;
789 }
790 } finally {
791 deferredLintHandler.setPos(prevLintPos);
792 }
793 }
795 /** Attribute type reference in an `extends' or `implements' clause.
796 * Supertypes of anonymous inner classes are usually already attributed.
797 *
798 * @param tree The tree making up the type reference.
799 * @param env The environment current at the reference.
800 * @param classExpected true if only a class is expected here.
801 * @param interfaceExpected true if only an interface is expected here.
802 */
803 Type attribBase(JCTree tree,
804 Env<AttrContext> env,
805 boolean classExpected,
806 boolean interfaceExpected,
807 boolean checkExtensible) {
808 Type t = tree.type != null ?
809 tree.type :
810 attribType(tree, env);
811 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
812 }
813 Type checkBase(Type t,
814 JCTree tree,
815 Env<AttrContext> env,
816 boolean classExpected,
817 boolean interfaceExpected,
818 boolean checkExtensible) {
819 if (t.tsym.isAnonymous()) {
820 log.error(tree.pos(), "cant.inherit.from.anon");
821 return types.createErrorType(t);
822 }
823 if (t.isErroneous())
824 return t;
825 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
826 // check that type variable is already visible
827 if (t.getUpperBound() == null) {
828 log.error(tree.pos(), "illegal.forward.ref");
829 return types.createErrorType(t);
830 }
831 } else {
832 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
833 }
834 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
835 log.error(tree.pos(), "intf.expected.here");
836 // return errType is necessary since otherwise there might
837 // be undetected cycles which cause attribution to loop
838 return types.createErrorType(t);
839 } else if (checkExtensible &&
840 classExpected &&
841 (t.tsym.flags() & INTERFACE) != 0) {
842 log.error(tree.pos(), "no.intf.expected.here");
843 return types.createErrorType(t);
844 }
845 if (checkExtensible &&
846 ((t.tsym.flags() & FINAL) != 0)) {
847 log.error(tree.pos(),
848 "cant.inherit.from.final", t.tsym);
849 }
850 chk.checkNonCyclic(tree.pos(), t);
851 return t;
852 }
854 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
855 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
856 id.type = env.info.scope.owner.type;
857 id.sym = env.info.scope.owner;
858 return id.type;
859 }
861 public void visitClassDef(JCClassDecl tree) {
862 // Local classes have not been entered yet, so we need to do it now:
863 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
864 enter.classEnter(tree, env);
866 ClassSymbol c = tree.sym;
867 if (c == null) {
868 // exit in case something drastic went wrong during enter.
869 result = null;
870 } else {
871 // make sure class has been completed:
872 c.complete();
874 // If this class appears as an anonymous class
875 // in a superclass constructor call where
876 // no explicit outer instance is given,
877 // disable implicit outer instance from being passed.
878 // (This would be an illegal access to "this before super").
879 if (env.info.isSelfCall &&
880 env.tree.hasTag(NEWCLASS) &&
881 ((JCNewClass) env.tree).encl == null)
882 {
883 c.flags_field |= NOOUTERTHIS;
884 }
885 attribClass(tree.pos(), c);
886 result = tree.type = c.type;
887 }
888 }
890 public void visitMethodDef(JCMethodDecl tree) {
891 MethodSymbol m = tree.sym;
892 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
894 Lint lint = env.info.lint.augment(m);
895 Lint prevLint = chk.setLint(lint);
896 MethodSymbol prevMethod = chk.setMethod(m);
897 try {
898 deferredLintHandler.flush(tree.pos());
899 chk.checkDeprecatedAnnotation(tree.pos(), m);
902 // Create a new environment with local scope
903 // for attributing the method.
904 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
905 localEnv.info.lint = lint;
907 attribStats(tree.typarams, localEnv);
909 // If we override any other methods, check that we do so properly.
910 // JLS ???
911 if (m.isStatic()) {
912 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
913 } else {
914 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
915 }
916 chk.checkOverride(tree, m);
918 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
919 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
920 }
922 // Enter all type parameters into the local method scope.
923 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
924 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
926 ClassSymbol owner = env.enclClass.sym;
927 if ((owner.flags() & ANNOTATION) != 0 &&
928 tree.params.nonEmpty())
929 log.error(tree.params.head.pos(),
930 "intf.annotation.members.cant.have.params");
932 // Attribute all value parameters.
933 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
934 attribStat(l.head, localEnv);
935 }
937 chk.checkVarargsMethodDecl(localEnv, tree);
939 // Check that type parameters are well-formed.
940 chk.validate(tree.typarams, localEnv);
942 // Check that result type is well-formed.
943 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
944 chk.validate(tree.restype, localEnv);
946 // Check that receiver type is well-formed.
947 if (tree.recvparam != null) {
948 // Use a new environment to check the receiver parameter.
949 // Otherwise I get "might not have been initialized" errors.
950 // Is there a better way?
951 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
952 attribType(tree.recvparam, newEnv);
953 chk.validate(tree.recvparam, newEnv);
954 }
956 // annotation method checks
957 if ((owner.flags() & ANNOTATION) != 0) {
958 // annotation method cannot have throws clause
959 if (tree.thrown.nonEmpty()) {
960 log.error(tree.thrown.head.pos(),
961 "throws.not.allowed.in.intf.annotation");
962 }
963 // annotation method cannot declare type-parameters
964 if (tree.typarams.nonEmpty()) {
965 log.error(tree.typarams.head.pos(),
966 "intf.annotation.members.cant.have.type.params");
967 }
968 // validate annotation method's return type (could be an annotation type)
969 chk.validateAnnotationType(tree.restype);
970 // ensure that annotation method does not clash with members of Object/Annotation
971 chk.validateAnnotationMethod(tree.pos(), m);
972 }
974 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
975 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
977 if (tree.body == null) {
978 // Empty bodies are only allowed for
979 // abstract, native, or interface methods, or for methods
980 // in a retrofit signature class.
981 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
982 !relax)
983 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
984 if (tree.defaultValue != null) {
985 if ((owner.flags() & ANNOTATION) == 0)
986 log.error(tree.pos(),
987 "default.allowed.in.intf.annotation.member");
988 }
989 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
990 if ((owner.flags() & INTERFACE) != 0) {
991 log.error(tree.body.pos(), "intf.meth.cant.have.body");
992 } else {
993 log.error(tree.pos(), "abstract.meth.cant.have.body");
994 }
995 } else if ((tree.mods.flags & NATIVE) != 0) {
996 log.error(tree.pos(), "native.meth.cant.have.body");
997 } else {
998 // Add an implicit super() call unless an explicit call to
999 // super(...) or this(...) is given
1000 // or we are compiling class java.lang.Object.
1001 if (tree.name == names.init && owner.type != syms.objectType) {
1002 JCBlock body = tree.body;
1003 if (body.stats.isEmpty() ||
1004 !TreeInfo.isSelfCall(body.stats.head)) {
1005 body.stats = body.stats.
1006 prepend(memberEnter.SuperCall(make.at(body.pos),
1007 List.<Type>nil(),
1008 List.<JCVariableDecl>nil(),
1009 false));
1010 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1011 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1012 TreeInfo.isSuperCall(body.stats.head)) {
1013 // enum constructors are not allowed to call super
1014 // directly, so make sure there aren't any super calls
1015 // in enum constructors, except in the compiler
1016 // generated one.
1017 log.error(tree.body.stats.head.pos(),
1018 "call.to.super.not.allowed.in.enum.ctor",
1019 env.enclClass.sym);
1020 }
1021 }
1023 // Attribute all type annotations in the body
1024 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1025 annotate.flush();
1027 // Attribute method body.
1028 attribStat(tree.body, localEnv);
1029 }
1031 localEnv.info.scope.leave();
1032 result = tree.type = m.type;
1033 }
1034 finally {
1035 chk.setLint(prevLint);
1036 chk.setMethod(prevMethod);
1037 }
1038 }
1040 public void visitVarDef(JCVariableDecl tree) {
1041 // Local variables have not been entered yet, so we need to do it now:
1042 if (env.info.scope.owner.kind == MTH) {
1043 if (tree.sym != null) {
1044 // parameters have already been entered
1045 env.info.scope.enter(tree.sym);
1046 } else {
1047 memberEnter.memberEnter(tree, env);
1048 annotate.flush();
1049 }
1050 } else {
1051 if (tree.init != null) {
1052 // Field initializer expression need to be entered.
1053 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1054 annotate.flush();
1055 }
1056 }
1058 VarSymbol v = tree.sym;
1059 Lint lint = env.info.lint.augment(v);
1060 Lint prevLint = chk.setLint(lint);
1062 // Check that the variable's declared type is well-formed.
1063 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1064 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1065 (tree.sym.flags() & PARAMETER) != 0;
1066 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1068 try {
1069 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1070 deferredLintHandler.flush(tree.pos());
1071 chk.checkDeprecatedAnnotation(tree.pos(), v);
1073 if (tree.init != null) {
1074 if ((v.flags_field & FINAL) == 0 ||
1075 !memberEnter.needsLazyConstValue(tree.init)) {
1076 // Not a compile-time constant
1077 // Attribute initializer in a new environment
1078 // with the declared variable as owner.
1079 // Check that initializer conforms to variable's declared type.
1080 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1081 initEnv.info.lint = lint;
1082 // In order to catch self-references, we set the variable's
1083 // declaration position to maximal possible value, effectively
1084 // marking the variable as undefined.
1085 initEnv.info.enclVar = v;
1086 attribExpr(tree.init, initEnv, v.type);
1087 }
1088 }
1089 result = tree.type = v.type;
1090 }
1091 finally {
1092 chk.setLint(prevLint);
1093 }
1094 }
1096 public void visitSkip(JCSkip tree) {
1097 result = null;
1098 }
1100 public void visitBlock(JCBlock tree) {
1101 if (env.info.scope.owner.kind == TYP) {
1102 // Block is a static or instance initializer;
1103 // let the owner of the environment be a freshly
1104 // created BLOCK-method.
1105 Env<AttrContext> localEnv =
1106 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1107 localEnv.info.scope.owner =
1108 new MethodSymbol(tree.flags | BLOCK |
1109 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1110 env.info.scope.owner);
1111 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1113 // Attribute all type annotations in the block
1114 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1115 annotate.flush();
1117 {
1118 // Store init and clinit type annotations with the ClassSymbol
1119 // to allow output in Gen.normalizeDefs.
1120 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1121 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1122 if ((tree.flags & STATIC) != 0) {
1123 cs.appendClassInitTypeAttributes(tas);
1124 } else {
1125 cs.appendInitTypeAttributes(tas);
1126 }
1127 }
1129 attribStats(tree.stats, localEnv);
1130 } else {
1131 // Create a new local environment with a local scope.
1132 Env<AttrContext> localEnv =
1133 env.dup(tree, env.info.dup(env.info.scope.dup()));
1134 try {
1135 attribStats(tree.stats, localEnv);
1136 } finally {
1137 localEnv.info.scope.leave();
1138 }
1139 }
1140 result = null;
1141 }
1143 public void visitDoLoop(JCDoWhileLoop tree) {
1144 attribStat(tree.body, env.dup(tree));
1145 attribExpr(tree.cond, env, syms.booleanType);
1146 result = null;
1147 }
1149 public void visitWhileLoop(JCWhileLoop tree) {
1150 attribExpr(tree.cond, env, syms.booleanType);
1151 attribStat(tree.body, env.dup(tree));
1152 result = null;
1153 }
1155 public void visitForLoop(JCForLoop tree) {
1156 Env<AttrContext> loopEnv =
1157 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1158 try {
1159 attribStats(tree.init, loopEnv);
1160 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1161 loopEnv.tree = tree; // before, we were not in loop!
1162 attribStats(tree.step, loopEnv);
1163 attribStat(tree.body, loopEnv);
1164 result = null;
1165 }
1166 finally {
1167 loopEnv.info.scope.leave();
1168 }
1169 }
1171 public void visitForeachLoop(JCEnhancedForLoop tree) {
1172 Env<AttrContext> loopEnv =
1173 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1174 try {
1175 //the Formal Parameter of a for-each loop is not in the scope when
1176 //attributing the for-each expression; we mimick this by attributing
1177 //the for-each expression first (against original scope).
1178 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1179 attribStat(tree.var, loopEnv);
1180 chk.checkNonVoid(tree.pos(), exprType);
1181 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1182 if (elemtype == null) {
1183 // or perhaps expr implements Iterable<T>?
1184 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1185 if (base == null) {
1186 log.error(tree.expr.pos(),
1187 "foreach.not.applicable.to.type",
1188 exprType,
1189 diags.fragment("type.req.array.or.iterable"));
1190 elemtype = types.createErrorType(exprType);
1191 } else {
1192 List<Type> iterableParams = base.allparams();
1193 elemtype = iterableParams.isEmpty()
1194 ? syms.objectType
1195 : types.wildUpperBound(iterableParams.head);
1196 }
1197 }
1198 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1199 loopEnv.tree = tree; // before, we were not in loop!
1200 attribStat(tree.body, loopEnv);
1201 result = null;
1202 }
1203 finally {
1204 loopEnv.info.scope.leave();
1205 }
1206 }
1208 public void visitLabelled(JCLabeledStatement tree) {
1209 // Check that label is not used in an enclosing statement
1210 Env<AttrContext> env1 = env;
1211 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1212 if (env1.tree.hasTag(LABELLED) &&
1213 ((JCLabeledStatement) env1.tree).label == tree.label) {
1214 log.error(tree.pos(), "label.already.in.use",
1215 tree.label);
1216 break;
1217 }
1218 env1 = env1.next;
1219 }
1221 attribStat(tree.body, env.dup(tree));
1222 result = null;
1223 }
1225 public void visitSwitch(JCSwitch tree) {
1226 Type seltype = attribExpr(tree.selector, env);
1228 Env<AttrContext> switchEnv =
1229 env.dup(tree, env.info.dup(env.info.scope.dup()));
1231 try {
1233 boolean enumSwitch =
1234 allowEnums &&
1235 (seltype.tsym.flags() & Flags.ENUM) != 0;
1236 boolean stringSwitch = false;
1237 if (types.isSameType(seltype, syms.stringType)) {
1238 if (allowStringsInSwitch) {
1239 stringSwitch = true;
1240 } else {
1241 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1242 }
1243 }
1244 if (!enumSwitch && !stringSwitch)
1245 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1247 // Attribute all cases and
1248 // check that there are no duplicate case labels or default clauses.
1249 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1250 boolean hasDefault = false; // Is there a default label?
1251 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1252 JCCase c = l.head;
1253 Env<AttrContext> caseEnv =
1254 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1255 try {
1256 if (c.pat != null) {
1257 if (enumSwitch) {
1258 Symbol sym = enumConstant(c.pat, seltype);
1259 if (sym == null) {
1260 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1261 } else if (!labels.add(sym)) {
1262 log.error(c.pos(), "duplicate.case.label");
1263 }
1264 } else {
1265 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1266 if (!pattype.hasTag(ERROR)) {
1267 if (pattype.constValue() == null) {
1268 log.error(c.pat.pos(),
1269 (stringSwitch ? "string.const.req" : "const.expr.req"));
1270 } else if (labels.contains(pattype.constValue())) {
1271 log.error(c.pos(), "duplicate.case.label");
1272 } else {
1273 labels.add(pattype.constValue());
1274 }
1275 }
1276 }
1277 } else if (hasDefault) {
1278 log.error(c.pos(), "duplicate.default.label");
1279 } else {
1280 hasDefault = true;
1281 }
1282 attribStats(c.stats, caseEnv);
1283 } finally {
1284 caseEnv.info.scope.leave();
1285 addVars(c.stats, switchEnv.info.scope);
1286 }
1287 }
1289 result = null;
1290 }
1291 finally {
1292 switchEnv.info.scope.leave();
1293 }
1294 }
1295 // where
1296 /** Add any variables defined in stats to the switch scope. */
1297 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1298 for (;stats.nonEmpty(); stats = stats.tail) {
1299 JCTree stat = stats.head;
1300 if (stat.hasTag(VARDEF))
1301 switchScope.enter(((JCVariableDecl) stat).sym);
1302 }
1303 }
1304 // where
1305 /** Return the selected enumeration constant symbol, or null. */
1306 private Symbol enumConstant(JCTree tree, Type enumType) {
1307 if (!tree.hasTag(IDENT)) {
1308 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1309 return syms.errSymbol;
1310 }
1311 JCIdent ident = (JCIdent)tree;
1312 Name name = ident.name;
1313 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1314 e.scope != null; e = e.next()) {
1315 if (e.sym.kind == VAR) {
1316 Symbol s = ident.sym = e.sym;
1317 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1318 ident.type = s.type;
1319 return ((s.flags_field & Flags.ENUM) == 0)
1320 ? null : s;
1321 }
1322 }
1323 return null;
1324 }
1326 public void visitSynchronized(JCSynchronized tree) {
1327 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1328 attribStat(tree.body, env);
1329 result = null;
1330 }
1332 public void visitTry(JCTry tree) {
1333 // Create a new local environment with a local
1334 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1335 try {
1336 boolean isTryWithResource = tree.resources.nonEmpty();
1337 // Create a nested environment for attributing the try block if needed
1338 Env<AttrContext> tryEnv = isTryWithResource ?
1339 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1340 localEnv;
1341 try {
1342 // Attribute resource declarations
1343 for (JCTree resource : tree.resources) {
1344 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1345 @Override
1346 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1347 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1348 }
1349 };
1350 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1351 if (resource.hasTag(VARDEF)) {
1352 attribStat(resource, tryEnv);
1353 twrResult.check(resource, resource.type);
1355 //check that resource type cannot throw InterruptedException
1356 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1358 VarSymbol var = ((JCVariableDecl) resource).sym;
1359 var.setData(ElementKind.RESOURCE_VARIABLE);
1360 } else {
1361 attribTree(resource, tryEnv, twrResult);
1362 }
1363 }
1364 // Attribute body
1365 attribStat(tree.body, tryEnv);
1366 } finally {
1367 if (isTryWithResource)
1368 tryEnv.info.scope.leave();
1369 }
1371 // Attribute catch clauses
1372 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1373 JCCatch c = l.head;
1374 Env<AttrContext> catchEnv =
1375 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1376 try {
1377 Type ctype = attribStat(c.param, catchEnv);
1378 if (TreeInfo.isMultiCatch(c)) {
1379 //multi-catch parameter is implicitly marked as final
1380 c.param.sym.flags_field |= FINAL | UNION;
1381 }
1382 if (c.param.sym.kind == Kinds.VAR) {
1383 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1384 }
1385 chk.checkType(c.param.vartype.pos(),
1386 chk.checkClassType(c.param.vartype.pos(), ctype),
1387 syms.throwableType);
1388 attribStat(c.body, catchEnv);
1389 } finally {
1390 catchEnv.info.scope.leave();
1391 }
1392 }
1394 // Attribute finalizer
1395 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1396 result = null;
1397 }
1398 finally {
1399 localEnv.info.scope.leave();
1400 }
1401 }
1403 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1404 if (!resource.isErroneous() &&
1405 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1406 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1407 Symbol close = syms.noSymbol;
1408 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1409 try {
1410 close = rs.resolveQualifiedMethod(pos,
1411 env,
1412 resource,
1413 names.close,
1414 List.<Type>nil(),
1415 List.<Type>nil());
1416 }
1417 finally {
1418 log.popDiagnosticHandler(discardHandler);
1419 }
1420 if (close.kind == MTH &&
1421 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1422 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1423 env.info.lint.isEnabled(LintCategory.TRY)) {
1424 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1425 }
1426 }
1427 }
1429 public void visitConditional(JCConditional tree) {
1430 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1432 tree.polyKind = (!allowPoly ||
1433 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1434 isBooleanOrNumeric(env, tree)) ?
1435 PolyKind.STANDALONE : PolyKind.POLY;
1437 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1438 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1439 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1440 result = tree.type = types.createErrorType(resultInfo.pt);
1441 return;
1442 }
1444 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1445 unknownExprInfo :
1446 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1447 //this will use enclosing check context to check compatibility of
1448 //subexpression against target type; if we are in a method check context,
1449 //depending on whether boxing is allowed, we could have incompatibilities
1450 @Override
1451 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1452 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1453 }
1454 });
1456 Type truetype = attribTree(tree.truepart, env, condInfo);
1457 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1459 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1460 if (condtype.constValue() != null &&
1461 truetype.constValue() != null &&
1462 falsetype.constValue() != null &&
1463 !owntype.hasTag(NONE)) {
1464 //constant folding
1465 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1466 }
1467 result = check(tree, owntype, VAL, resultInfo);
1468 }
1469 //where
1470 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1471 switch (tree.getTag()) {
1472 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1473 ((JCLiteral)tree).typetag == BOOLEAN ||
1474 ((JCLiteral)tree).typetag == BOT;
1475 case LAMBDA: case REFERENCE: return false;
1476 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1477 case CONDEXPR:
1478 JCConditional condTree = (JCConditional)tree;
1479 return isBooleanOrNumeric(env, condTree.truepart) &&
1480 isBooleanOrNumeric(env, condTree.falsepart);
1481 case APPLY:
1482 JCMethodInvocation speculativeMethodTree =
1483 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1484 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1485 return types.unboxedTypeOrType(owntype).isPrimitive();
1486 case NEWCLASS:
1487 JCExpression className =
1488 removeClassParams.translate(((JCNewClass)tree).clazz);
1489 JCExpression speculativeNewClassTree =
1490 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1491 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1492 default:
1493 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1494 speculativeType = types.unboxedTypeOrType(speculativeType);
1495 return speculativeType.isPrimitive();
1496 }
1497 }
1498 //where
1499 TreeTranslator removeClassParams = new TreeTranslator() {
1500 @Override
1501 public void visitTypeApply(JCTypeApply tree) {
1502 result = translate(tree.clazz);
1503 }
1504 };
1506 /** Compute the type of a conditional expression, after
1507 * checking that it exists. See JLS 15.25. Does not take into
1508 * account the special case where condition and both arms
1509 * are constants.
1510 *
1511 * @param pos The source position to be used for error
1512 * diagnostics.
1513 * @param thentype The type of the expression's then-part.
1514 * @param elsetype The type of the expression's else-part.
1515 */
1516 private Type condType(DiagnosticPosition pos,
1517 Type thentype, Type elsetype) {
1518 // If same type, that is the result
1519 if (types.isSameType(thentype, elsetype))
1520 return thentype.baseType();
1522 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1523 ? thentype : types.unboxedType(thentype);
1524 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1525 ? elsetype : types.unboxedType(elsetype);
1527 // Otherwise, if both arms can be converted to a numeric
1528 // type, return the least numeric type that fits both arms
1529 // (i.e. return larger of the two, or return int if one
1530 // arm is short, the other is char).
1531 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1532 // If one arm has an integer subrange type (i.e., byte,
1533 // short, or char), and the other is an integer constant
1534 // that fits into the subrange, return the subrange type.
1535 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1536 elseUnboxed.hasTag(INT) &&
1537 types.isAssignable(elseUnboxed, thenUnboxed)) {
1538 return thenUnboxed.baseType();
1539 }
1540 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1541 thenUnboxed.hasTag(INT) &&
1542 types.isAssignable(thenUnboxed, elseUnboxed)) {
1543 return elseUnboxed.baseType();
1544 }
1546 for (TypeTag tag : primitiveTags) {
1547 Type candidate = syms.typeOfTag[tag.ordinal()];
1548 if (types.isSubtype(thenUnboxed, candidate) &&
1549 types.isSubtype(elseUnboxed, candidate)) {
1550 return candidate;
1551 }
1552 }
1553 }
1555 // Those were all the cases that could result in a primitive
1556 if (allowBoxing) {
1557 if (thentype.isPrimitive())
1558 thentype = types.boxedClass(thentype).type;
1559 if (elsetype.isPrimitive())
1560 elsetype = types.boxedClass(elsetype).type;
1561 }
1563 if (types.isSubtype(thentype, elsetype))
1564 return elsetype.baseType();
1565 if (types.isSubtype(elsetype, thentype))
1566 return thentype.baseType();
1568 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1569 log.error(pos, "neither.conditional.subtype",
1570 thentype, elsetype);
1571 return thentype.baseType();
1572 }
1574 // both are known to be reference types. The result is
1575 // lub(thentype,elsetype). This cannot fail, as it will
1576 // always be possible to infer "Object" if nothing better.
1577 return types.lub(thentype.baseType(), elsetype.baseType());
1578 }
1580 final static TypeTag[] primitiveTags = new TypeTag[]{
1581 BYTE,
1582 CHAR,
1583 SHORT,
1584 INT,
1585 LONG,
1586 FLOAT,
1587 DOUBLE,
1588 BOOLEAN,
1589 };
1591 public void visitIf(JCIf tree) {
1592 attribExpr(tree.cond, env, syms.booleanType);
1593 attribStat(tree.thenpart, env);
1594 if (tree.elsepart != null)
1595 attribStat(tree.elsepart, env);
1596 chk.checkEmptyIf(tree);
1597 result = null;
1598 }
1600 public void visitExec(JCExpressionStatement tree) {
1601 //a fresh environment is required for 292 inference to work properly ---
1602 //see Infer.instantiatePolymorphicSignatureInstance()
1603 Env<AttrContext> localEnv = env.dup(tree);
1604 attribExpr(tree.expr, localEnv);
1605 result = null;
1606 }
1608 public void visitBreak(JCBreak tree) {
1609 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1610 result = null;
1611 }
1613 public void visitContinue(JCContinue tree) {
1614 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1615 result = null;
1616 }
1617 //where
1618 /** Return the target of a break or continue statement, if it exists,
1619 * report an error if not.
1620 * Note: The target of a labelled break or continue is the
1621 * (non-labelled) statement tree referred to by the label,
1622 * not the tree representing the labelled statement itself.
1623 *
1624 * @param pos The position to be used for error diagnostics
1625 * @param tag The tag of the jump statement. This is either
1626 * Tree.BREAK or Tree.CONTINUE.
1627 * @param label The label of the jump statement, or null if no
1628 * label is given.
1629 * @param env The environment current at the jump statement.
1630 */
1631 private JCTree findJumpTarget(DiagnosticPosition pos,
1632 JCTree.Tag tag,
1633 Name label,
1634 Env<AttrContext> env) {
1635 // Search environments outwards from the point of jump.
1636 Env<AttrContext> env1 = env;
1637 LOOP:
1638 while (env1 != null) {
1639 switch (env1.tree.getTag()) {
1640 case LABELLED:
1641 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1642 if (label == labelled.label) {
1643 // If jump is a continue, check that target is a loop.
1644 if (tag == CONTINUE) {
1645 if (!labelled.body.hasTag(DOLOOP) &&
1646 !labelled.body.hasTag(WHILELOOP) &&
1647 !labelled.body.hasTag(FORLOOP) &&
1648 !labelled.body.hasTag(FOREACHLOOP))
1649 log.error(pos, "not.loop.label", label);
1650 // Found labelled statement target, now go inwards
1651 // to next non-labelled tree.
1652 return TreeInfo.referencedStatement(labelled);
1653 } else {
1654 return labelled;
1655 }
1656 }
1657 break;
1658 case DOLOOP:
1659 case WHILELOOP:
1660 case FORLOOP:
1661 case FOREACHLOOP:
1662 if (label == null) return env1.tree;
1663 break;
1664 case SWITCH:
1665 if (label == null && tag == BREAK) return env1.tree;
1666 break;
1667 case LAMBDA:
1668 case METHODDEF:
1669 case CLASSDEF:
1670 break LOOP;
1671 default:
1672 }
1673 env1 = env1.next;
1674 }
1675 if (label != null)
1676 log.error(pos, "undef.label", label);
1677 else if (tag == CONTINUE)
1678 log.error(pos, "cont.outside.loop");
1679 else
1680 log.error(pos, "break.outside.switch.loop");
1681 return null;
1682 }
1684 public void visitReturn(JCReturn tree) {
1685 // Check that there is an enclosing method which is
1686 // nested within than the enclosing class.
1687 if (env.info.returnResult == null) {
1688 log.error(tree.pos(), "ret.outside.meth");
1689 } else {
1690 // Attribute return expression, if it exists, and check that
1691 // it conforms to result type of enclosing method.
1692 if (tree.expr != null) {
1693 if (env.info.returnResult.pt.hasTag(VOID)) {
1694 env.info.returnResult.checkContext.report(tree.expr.pos(),
1695 diags.fragment("unexpected.ret.val"));
1696 }
1697 attribTree(tree.expr, env, env.info.returnResult);
1698 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1699 !env.info.returnResult.pt.hasTag(NONE)) {
1700 env.info.returnResult.checkContext.report(tree.pos(),
1701 diags.fragment("missing.ret.val"));
1702 }
1703 }
1704 result = null;
1705 }
1707 public void visitThrow(JCThrow tree) {
1708 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1709 if (allowPoly) {
1710 chk.checkType(tree, owntype, syms.throwableType);
1711 }
1712 result = null;
1713 }
1715 public void visitAssert(JCAssert tree) {
1716 attribExpr(tree.cond, env, syms.booleanType);
1717 if (tree.detail != null) {
1718 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1719 }
1720 result = null;
1721 }
1723 /** Visitor method for method invocations.
1724 * NOTE: The method part of an application will have in its type field
1725 * the return type of the method, not the method's type itself!
1726 */
1727 public void visitApply(JCMethodInvocation tree) {
1728 // The local environment of a method application is
1729 // a new environment nested in the current one.
1730 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1732 // The types of the actual method arguments.
1733 List<Type> argtypes;
1735 // The types of the actual method type arguments.
1736 List<Type> typeargtypes = null;
1738 Name methName = TreeInfo.name(tree.meth);
1740 boolean isConstructorCall =
1741 methName == names._this || methName == names._super;
1743 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1744 if (isConstructorCall) {
1745 // We are seeing a ...this(...) or ...super(...) call.
1746 // Check that this is the first statement in a constructor.
1747 if (checkFirstConstructorStat(tree, env)) {
1749 // Record the fact
1750 // that this is a constructor call (using isSelfCall).
1751 localEnv.info.isSelfCall = true;
1753 // Attribute arguments, yielding list of argument types.
1754 attribArgs(tree.args, localEnv, argtypesBuf);
1755 argtypes = argtypesBuf.toList();
1756 typeargtypes = attribTypes(tree.typeargs, localEnv);
1758 // Variable `site' points to the class in which the called
1759 // constructor is defined.
1760 Type site = env.enclClass.sym.type;
1761 if (methName == names._super) {
1762 if (site == syms.objectType) {
1763 log.error(tree.meth.pos(), "no.superclass", site);
1764 site = types.createErrorType(syms.objectType);
1765 } else {
1766 site = types.supertype(site);
1767 }
1768 }
1770 if (site.hasTag(CLASS)) {
1771 Type encl = site.getEnclosingType();
1772 while (encl != null && encl.hasTag(TYPEVAR))
1773 encl = encl.getUpperBound();
1774 if (encl.hasTag(CLASS)) {
1775 // we are calling a nested class
1777 if (tree.meth.hasTag(SELECT)) {
1778 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1780 // We are seeing a prefixed call, of the form
1781 // <expr>.super(...).
1782 // Check that the prefix expression conforms
1783 // to the outer instance type of the class.
1784 chk.checkRefType(qualifier.pos(),
1785 attribExpr(qualifier, localEnv,
1786 encl));
1787 } else if (methName == names._super) {
1788 // qualifier omitted; check for existence
1789 // of an appropriate implicit qualifier.
1790 rs.resolveImplicitThis(tree.meth.pos(),
1791 localEnv, site, true);
1792 }
1793 } else if (tree.meth.hasTag(SELECT)) {
1794 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1795 site.tsym);
1796 }
1798 // if we're calling a java.lang.Enum constructor,
1799 // prefix the implicit String and int parameters
1800 if (site.tsym == syms.enumSym && allowEnums)
1801 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1803 // Resolve the called constructor under the assumption
1804 // that we are referring to a superclass instance of the
1805 // current instance (JLS ???).
1806 boolean selectSuperPrev = localEnv.info.selectSuper;
1807 localEnv.info.selectSuper = true;
1808 localEnv.info.pendingResolutionPhase = null;
1809 Symbol sym = rs.resolveConstructor(
1810 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1811 localEnv.info.selectSuper = selectSuperPrev;
1813 // Set method symbol to resolved constructor...
1814 TreeInfo.setSymbol(tree.meth, sym);
1816 // ...and check that it is legal in the current context.
1817 // (this will also set the tree's type)
1818 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1819 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1820 }
1821 // Otherwise, `site' is an error type and we do nothing
1822 }
1823 result = tree.type = syms.voidType;
1824 } else {
1825 // Otherwise, we are seeing a regular method call.
1826 // Attribute the arguments, yielding list of argument types, ...
1827 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1828 argtypes = argtypesBuf.toList();
1829 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1831 // ... and attribute the method using as a prototype a methodtype
1832 // whose formal argument types is exactly the list of actual
1833 // arguments (this will also set the method symbol).
1834 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1835 localEnv.info.pendingResolutionPhase = null;
1836 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1838 // Compute the result type.
1839 Type restype = mtype.getReturnType();
1840 if (restype.hasTag(WILDCARD))
1841 throw new AssertionError(mtype);
1843 Type qualifier = (tree.meth.hasTag(SELECT))
1844 ? ((JCFieldAccess) tree.meth).selected.type
1845 : env.enclClass.sym.type;
1846 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1848 chk.checkRefTypes(tree.typeargs, typeargtypes);
1850 // Check that value of resulting type is admissible in the
1851 // current context. Also, capture the return type
1852 result = check(tree, capture(restype), VAL, resultInfo);
1853 }
1854 chk.validate(tree.typeargs, localEnv);
1855 }
1856 //where
1857 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1858 if (allowCovariantReturns &&
1859 methodName == names.clone &&
1860 types.isArray(qualifierType)) {
1861 // as a special case, array.clone() has a result that is
1862 // the same as static type of the array being cloned
1863 return qualifierType;
1864 } else if (allowGenerics &&
1865 methodName == names.getClass &&
1866 argtypes.isEmpty()) {
1867 // as a special case, x.getClass() has type Class<? extends |X|>
1868 return new ClassType(restype.getEnclosingType(),
1869 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1870 BoundKind.EXTENDS,
1871 syms.boundClass)),
1872 restype.tsym);
1873 } else {
1874 return restype;
1875 }
1876 }
1878 /** Check that given application node appears as first statement
1879 * in a constructor call.
1880 * @param tree The application node
1881 * @param env The environment current at the application.
1882 */
1883 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1884 JCMethodDecl enclMethod = env.enclMethod;
1885 if (enclMethod != null && enclMethod.name == names.init) {
1886 JCBlock body = enclMethod.body;
1887 if (body.stats.head.hasTag(EXEC) &&
1888 ((JCExpressionStatement) body.stats.head).expr == tree)
1889 return true;
1890 }
1891 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1892 TreeInfo.name(tree.meth));
1893 return false;
1894 }
1896 /** Obtain a method type with given argument types.
1897 */
1898 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1899 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1900 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1901 }
1903 public void visitNewClass(final JCNewClass tree) {
1904 Type owntype = types.createErrorType(tree.type);
1906 // The local environment of a class creation is
1907 // a new environment nested in the current one.
1908 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1910 // The anonymous inner class definition of the new expression,
1911 // if one is defined by it.
1912 JCClassDecl cdef = tree.def;
1914 // If enclosing class is given, attribute it, and
1915 // complete class name to be fully qualified
1916 JCExpression clazz = tree.clazz; // Class field following new
1917 JCExpression clazzid; // Identifier in class field
1918 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1919 annoclazzid = null;
1921 if (clazz.hasTag(TYPEAPPLY)) {
1922 clazzid = ((JCTypeApply) clazz).clazz;
1923 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1924 annoclazzid = (JCAnnotatedType) clazzid;
1925 clazzid = annoclazzid.underlyingType;
1926 }
1927 } else {
1928 if (clazz.hasTag(ANNOTATED_TYPE)) {
1929 annoclazzid = (JCAnnotatedType) clazz;
1930 clazzid = annoclazzid.underlyingType;
1931 } else {
1932 clazzid = clazz;
1933 }
1934 }
1936 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1938 if (tree.encl != null) {
1939 // We are seeing a qualified new, of the form
1940 // <expr>.new C <...> (...) ...
1941 // In this case, we let clazz stand for the name of the
1942 // allocated class C prefixed with the type of the qualifier
1943 // expression, so that we can
1944 // resolve it with standard techniques later. I.e., if
1945 // <expr> has type T, then <expr>.new C <...> (...)
1946 // yields a clazz T.C.
1947 Type encltype = chk.checkRefType(tree.encl.pos(),
1948 attribExpr(tree.encl, env));
1949 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1950 // from expr to the combined type, or not? Yes, do this.
1951 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1952 ((JCIdent) clazzid).name);
1954 EndPosTable endPosTable = this.env.toplevel.endPositions;
1955 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1956 if (clazz.hasTag(ANNOTATED_TYPE)) {
1957 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1958 List<JCAnnotation> annos = annoType.annotations;
1960 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1961 clazzid1 = make.at(tree.pos).
1962 TypeApply(clazzid1,
1963 ((JCTypeApply) clazz).arguments);
1964 }
1966 clazzid1 = make.at(tree.pos).
1967 AnnotatedType(annos, clazzid1);
1968 } else if (clazz.hasTag(TYPEAPPLY)) {
1969 clazzid1 = make.at(tree.pos).
1970 TypeApply(clazzid1,
1971 ((JCTypeApply) clazz).arguments);
1972 }
1974 clazz = clazzid1;
1975 }
1977 // Attribute clazz expression and store
1978 // symbol + type back into the attributed tree.
1979 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1980 attribIdentAsEnumType(env, (JCIdent)clazz) :
1981 attribType(clazz, env);
1983 clazztype = chk.checkDiamond(tree, clazztype);
1984 chk.validate(clazz, localEnv);
1985 if (tree.encl != null) {
1986 // We have to work in this case to store
1987 // symbol + type back into the attributed tree.
1988 tree.clazz.type = clazztype;
1989 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1990 clazzid.type = ((JCIdent) clazzid).sym.type;
1991 if (annoclazzid != null) {
1992 annoclazzid.type = clazzid.type;
1993 }
1994 if (!clazztype.isErroneous()) {
1995 if (cdef != null && clazztype.tsym.isInterface()) {
1996 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1997 } else if (clazztype.tsym.isStatic()) {
1998 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1999 }
2000 }
2001 } else if (!clazztype.tsym.isInterface() &&
2002 clazztype.getEnclosingType().hasTag(CLASS)) {
2003 // Check for the existence of an apropos outer instance
2004 rs.resolveImplicitThis(tree.pos(), env, clazztype);
2005 }
2007 // Attribute constructor arguments.
2008 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2009 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
2010 List<Type> argtypes = argtypesBuf.toList();
2011 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2013 // If we have made no mistakes in the class type...
2014 if (clazztype.hasTag(CLASS)) {
2015 // Enums may not be instantiated except implicitly
2016 if (allowEnums &&
2017 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2018 (!env.tree.hasTag(VARDEF) ||
2019 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2020 ((JCVariableDecl) env.tree).init != tree))
2021 log.error(tree.pos(), "enum.cant.be.instantiated");
2022 // Check that class is not abstract
2023 if (cdef == null &&
2024 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2025 log.error(tree.pos(), "abstract.cant.be.instantiated",
2026 clazztype.tsym);
2027 } else if (cdef != null && clazztype.tsym.isInterface()) {
2028 // Check that no constructor arguments are given to
2029 // anonymous classes implementing an interface
2030 if (!argtypes.isEmpty())
2031 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2033 if (!typeargtypes.isEmpty())
2034 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2036 // Error recovery: pretend no arguments were supplied.
2037 argtypes = List.nil();
2038 typeargtypes = List.nil();
2039 } else if (TreeInfo.isDiamond(tree)) {
2040 ClassType site = new ClassType(clazztype.getEnclosingType(),
2041 clazztype.tsym.type.getTypeArguments(),
2042 clazztype.tsym);
2044 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2045 diamondEnv.info.selectSuper = cdef != null;
2046 diamondEnv.info.pendingResolutionPhase = null;
2048 //if the type of the instance creation expression is a class type
2049 //apply method resolution inference (JLS 15.12.2.7). The return type
2050 //of the resolved constructor will be a partially instantiated type
2051 Symbol constructor = rs.resolveDiamond(tree.pos(),
2052 diamondEnv,
2053 site,
2054 argtypes,
2055 typeargtypes);
2056 tree.constructor = constructor.baseSymbol();
2058 final TypeSymbol csym = clazztype.tsym;
2059 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2060 @Override
2061 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2062 enclosingContext.report(tree.clazz,
2063 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2064 }
2065 });
2066 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2067 constructorType = checkId(tree, site,
2068 constructor,
2069 diamondEnv,
2070 diamondResult);
2072 tree.clazz.type = types.createErrorType(clazztype);
2073 if (!constructorType.isErroneous()) {
2074 tree.clazz.type = clazztype = constructorType.getReturnType();
2075 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2076 }
2077 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2078 }
2080 // Resolve the called constructor under the assumption
2081 // that we are referring to a superclass instance of the
2082 // current instance (JLS ???).
2083 else {
2084 //the following code alters some of the fields in the current
2085 //AttrContext - hence, the current context must be dup'ed in
2086 //order to avoid downstream failures
2087 Env<AttrContext> rsEnv = localEnv.dup(tree);
2088 rsEnv.info.selectSuper = cdef != null;
2089 rsEnv.info.pendingResolutionPhase = null;
2090 tree.constructor = rs.resolveConstructor(
2091 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2092 if (cdef == null) { //do not check twice!
2093 tree.constructorType = checkId(tree,
2094 clazztype,
2095 tree.constructor,
2096 rsEnv,
2097 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2098 if (rsEnv.info.lastResolveVarargs())
2099 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2100 }
2101 if (cdef == null &&
2102 !clazztype.isErroneous() &&
2103 clazztype.getTypeArguments().nonEmpty() &&
2104 findDiamonds) {
2105 findDiamond(localEnv, tree, clazztype);
2106 }
2107 }
2109 if (cdef != null) {
2110 // We are seeing an anonymous class instance creation.
2111 // In this case, the class instance creation
2112 // expression
2113 //
2114 // E.new <typeargs1>C<typargs2>(args) { ... }
2115 //
2116 // is represented internally as
2117 //
2118 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2119 //
2120 // This expression is then *transformed* as follows:
2121 //
2122 // (1) add a STATIC flag to the class definition
2123 // if the current environment is static
2124 // (2) add an extends or implements clause
2125 // (3) add a constructor.
2126 //
2127 // For instance, if C is a class, and ET is the type of E,
2128 // the expression
2129 //
2130 // E.new <typeargs1>C<typargs2>(args) { ... }
2131 //
2132 // is translated to (where X is a fresh name and typarams is the
2133 // parameter list of the super constructor):
2134 //
2135 // new <typeargs1>X(<*nullchk*>E, args) where
2136 // X extends C<typargs2> {
2137 // <typarams> X(ET e, args) {
2138 // e.<typeargs1>super(args)
2139 // }
2140 // ...
2141 // }
2142 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2144 if (clazztype.tsym.isInterface()) {
2145 cdef.implementing = List.of(clazz);
2146 } else {
2147 cdef.extending = clazz;
2148 }
2150 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2151 isSerializable(clazztype)) {
2152 localEnv.info.isSerializable = true;
2153 }
2155 attribStat(cdef, localEnv);
2157 checkLambdaCandidate(tree, cdef.sym, clazztype);
2159 // If an outer instance is given,
2160 // prefix it to the constructor arguments
2161 // and delete it from the new expression
2162 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2163 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2164 argtypes = argtypes.prepend(tree.encl.type);
2165 tree.encl = null;
2166 }
2168 // Reassign clazztype and recompute constructor.
2169 clazztype = cdef.sym.type;
2170 Symbol sym = tree.constructor = rs.resolveConstructor(
2171 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2172 Assert.check(sym.kind < AMBIGUOUS);
2173 tree.constructor = sym;
2174 tree.constructorType = checkId(tree,
2175 clazztype,
2176 tree.constructor,
2177 localEnv,
2178 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2179 }
2181 if (tree.constructor != null && tree.constructor.kind == MTH)
2182 owntype = clazztype;
2183 }
2184 result = check(tree, owntype, VAL, resultInfo);
2185 chk.validate(tree.typeargs, localEnv);
2186 }
2187 //where
2188 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2189 JCTypeApply ta = (JCTypeApply)tree.clazz;
2190 List<JCExpression> prevTypeargs = ta.arguments;
2191 try {
2192 //create a 'fake' diamond AST node by removing type-argument trees
2193 ta.arguments = List.nil();
2194 ResultInfo findDiamondResult = new ResultInfo(VAL,
2195 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2196 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2197 Type polyPt = allowPoly ?
2198 syms.objectType :
2199 clazztype;
2200 if (!inferred.isErroneous() &&
2201 (allowPoly && pt() == Infer.anyPoly ?
2202 types.isSameType(inferred, clazztype) :
2203 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2204 String key = types.isSameType(clazztype, inferred) ?
2205 "diamond.redundant.args" :
2206 "diamond.redundant.args.1";
2207 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2208 }
2209 } finally {
2210 ta.arguments = prevTypeargs;
2211 }
2212 }
2214 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2215 if (allowLambda &&
2216 identifyLambdaCandidate &&
2217 clazztype.hasTag(CLASS) &&
2218 !pt().hasTag(NONE) &&
2219 types.isFunctionalInterface(clazztype.tsym)) {
2220 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2221 int count = 0;
2222 boolean found = false;
2223 for (Symbol sym : csym.members().getElements()) {
2224 if ((sym.flags() & SYNTHETIC) != 0 ||
2225 sym.isConstructor()) continue;
2226 count++;
2227 if (sym.kind != MTH ||
2228 !sym.name.equals(descriptor.name)) continue;
2229 Type mtype = types.memberType(clazztype, sym);
2230 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2231 found = true;
2232 }
2233 }
2234 if (found && count == 1) {
2235 log.note(tree.def, "potential.lambda.found");
2236 }
2237 }
2238 }
2240 /** Make an attributed null check tree.
2241 */
2242 public JCExpression makeNullCheck(JCExpression arg) {
2243 // optimization: X.this is never null; skip null check
2244 Name name = TreeInfo.name(arg);
2245 if (name == names._this || name == names._super) return arg;
2247 JCTree.Tag optag = NULLCHK;
2248 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2249 tree.operator = syms.nullcheck;
2250 tree.type = arg.type;
2251 return tree;
2252 }
2254 public void visitNewArray(JCNewArray tree) {
2255 Type owntype = types.createErrorType(tree.type);
2256 Env<AttrContext> localEnv = env.dup(tree);
2257 Type elemtype;
2258 if (tree.elemtype != null) {
2259 elemtype = attribType(tree.elemtype, localEnv);
2260 chk.validate(tree.elemtype, localEnv);
2261 owntype = elemtype;
2262 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2263 attribExpr(l.head, localEnv, syms.intType);
2264 owntype = new ArrayType(owntype, syms.arrayClass);
2265 }
2266 } else {
2267 // we are seeing an untyped aggregate { ... }
2268 // this is allowed only if the prototype is an array
2269 if (pt().hasTag(ARRAY)) {
2270 elemtype = types.elemtype(pt());
2271 } else {
2272 if (!pt().hasTag(ERROR)) {
2273 log.error(tree.pos(), "illegal.initializer.for.type",
2274 pt());
2275 }
2276 elemtype = types.createErrorType(pt());
2277 }
2278 }
2279 if (tree.elems != null) {
2280 attribExprs(tree.elems, localEnv, elemtype);
2281 owntype = new ArrayType(elemtype, syms.arrayClass);
2282 }
2283 if (!types.isReifiable(elemtype))
2284 log.error(tree.pos(), "generic.array.creation");
2285 result = check(tree, owntype, VAL, resultInfo);
2286 }
2288 /*
2289 * A lambda expression can only be attributed when a target-type is available.
2290 * In addition, if the target-type is that of a functional interface whose
2291 * descriptor contains inference variables in argument position the lambda expression
2292 * is 'stuck' (see DeferredAttr).
2293 */
2294 @Override
2295 public void visitLambda(final JCLambda that) {
2296 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2297 if (pt().hasTag(NONE)) {
2298 //lambda only allowed in assignment or method invocation/cast context
2299 log.error(that.pos(), "unexpected.lambda");
2300 }
2301 result = that.type = types.createErrorType(pt());
2302 return;
2303 }
2304 //create an environment for attribution of the lambda expression
2305 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2306 boolean needsRecovery =
2307 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2308 try {
2309 Type currentTarget = pt();
2310 if (needsRecovery && isSerializable(currentTarget)) {
2311 localEnv.info.isSerializable = true;
2312 }
2313 List<Type> explicitParamTypes = null;
2314 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2315 //attribute lambda parameters
2316 attribStats(that.params, localEnv);
2317 explicitParamTypes = TreeInfo.types(that.params);
2318 }
2320 Type lambdaType;
2321 if (pt() != Type.recoveryType) {
2322 /* We need to adjust the target. If the target is an
2323 * intersection type, for example: SAM & I1 & I2 ...
2324 * the target will be updated to SAM
2325 */
2326 currentTarget = targetChecker.visit(currentTarget, that);
2327 if (explicitParamTypes != null) {
2328 currentTarget = infer.instantiateFunctionalInterface(that,
2329 currentTarget, explicitParamTypes, resultInfo.checkContext);
2330 }
2331 lambdaType = types.findDescriptorType(currentTarget);
2332 } else {
2333 currentTarget = Type.recoveryType;
2334 lambdaType = fallbackDescriptorType(that);
2335 }
2337 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2339 if (lambdaType.hasTag(FORALL)) {
2340 //lambda expression target desc cannot be a generic method
2341 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2342 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2343 result = that.type = types.createErrorType(pt());
2344 return;
2345 }
2347 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2348 //add param type info in the AST
2349 List<Type> actuals = lambdaType.getParameterTypes();
2350 List<JCVariableDecl> params = that.params;
2352 boolean arityMismatch = false;
2354 while (params.nonEmpty()) {
2355 if (actuals.isEmpty()) {
2356 //not enough actuals to perform lambda parameter inference
2357 arityMismatch = true;
2358 }
2359 //reset previously set info
2360 Type argType = arityMismatch ?
2361 syms.errType :
2362 actuals.head;
2363 params.head.vartype = make.at(params.head).Type(argType);
2364 params.head.sym = null;
2365 actuals = actuals.isEmpty() ?
2366 actuals :
2367 actuals.tail;
2368 params = params.tail;
2369 }
2371 //attribute lambda parameters
2372 attribStats(that.params, localEnv);
2374 if (arityMismatch) {
2375 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2376 result = that.type = types.createErrorType(currentTarget);
2377 return;
2378 }
2379 }
2381 //from this point on, no recovery is needed; if we are in assignment context
2382 //we will be able to attribute the whole lambda body, regardless of errors;
2383 //if we are in a 'check' method context, and the lambda is not compatible
2384 //with the target-type, it will be recovered anyway in Attr.checkId
2385 needsRecovery = false;
2387 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2388 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2389 new FunctionalReturnContext(resultInfo.checkContext);
2391 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2392 recoveryInfo :
2393 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2394 localEnv.info.returnResult = bodyResultInfo;
2396 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2397 attribTree(that.getBody(), localEnv, bodyResultInfo);
2398 } else {
2399 JCBlock body = (JCBlock)that.body;
2400 attribStats(body.stats, localEnv);
2401 }
2403 result = check(that, currentTarget, VAL, resultInfo);
2405 boolean isSpeculativeRound =
2406 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2408 preFlow(that);
2409 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2411 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2413 if (!isSpeculativeRound) {
2414 //add thrown types as bounds to the thrown types free variables if needed:
2415 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2416 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2417 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes());
2419 chk.unhandled(inferredThrownTypes, thrownTypes);
2420 }
2422 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2423 }
2424 result = check(that, currentTarget, VAL, resultInfo);
2425 } catch (Types.FunctionDescriptorLookupError ex) {
2426 JCDiagnostic cause = ex.getDiagnostic();
2427 resultInfo.checkContext.report(that, cause);
2428 result = that.type = types.createErrorType(pt());
2429 return;
2430 } finally {
2431 localEnv.info.scope.leave();
2432 if (needsRecovery) {
2433 attribTree(that, env, recoveryInfo);
2434 }
2435 }
2436 }
2437 //where
2438 void preFlow(JCLambda tree) {
2439 new PostAttrAnalyzer() {
2440 @Override
2441 public void scan(JCTree tree) {
2442 if (tree == null ||
2443 (tree.type != null &&
2444 tree.type == Type.stuckType)) {
2445 //don't touch stuck expressions!
2446 return;
2447 }
2448 super.scan(tree);
2449 }
2450 }.scan(tree);
2451 }
2453 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2455 @Override
2456 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2457 return t.isCompound() ?
2458 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2459 }
2461 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2462 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2463 Type target = null;
2464 for (Type bound : ict.getExplicitComponents()) {
2465 TypeSymbol boundSym = bound.tsym;
2466 if (types.isFunctionalInterface(boundSym) &&
2467 types.findDescriptorSymbol(boundSym) == desc) {
2468 target = bound;
2469 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2470 //bound must be an interface
2471 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2472 }
2473 }
2474 return target != null ?
2475 target :
2476 ict.getExplicitComponents().head; //error recovery
2477 }
2479 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2480 ListBuffer<Type> targs = new ListBuffer<>();
2481 ListBuffer<Type> supertypes = new ListBuffer<>();
2482 for (Type i : ict.interfaces_field) {
2483 if (i.isParameterized()) {
2484 targs.appendList(i.tsym.type.allparams());
2485 }
2486 supertypes.append(i.tsym.type);
2487 }
2488 IntersectionClassType notionalIntf =
2489 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2490 notionalIntf.allparams_field = targs.toList();
2491 notionalIntf.tsym.flags_field |= INTERFACE;
2492 return notionalIntf.tsym;
2493 }
2495 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2496 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2497 diags.fragment(key, args)));
2498 }
2499 };
2501 private Type fallbackDescriptorType(JCExpression tree) {
2502 switch (tree.getTag()) {
2503 case LAMBDA:
2504 JCLambda lambda = (JCLambda)tree;
2505 List<Type> argtypes = List.nil();
2506 for (JCVariableDecl param : lambda.params) {
2507 argtypes = param.vartype != null ?
2508 argtypes.append(param.vartype.type) :
2509 argtypes.append(syms.errType);
2510 }
2511 return new MethodType(argtypes, Type.recoveryType,
2512 List.of(syms.throwableType), syms.methodClass);
2513 case REFERENCE:
2514 return new MethodType(List.<Type>nil(), Type.recoveryType,
2515 List.of(syms.throwableType), syms.methodClass);
2516 default:
2517 Assert.error("Cannot get here!");
2518 }
2519 return null;
2520 }
2522 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2523 final InferenceContext inferenceContext, final Type... ts) {
2524 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2525 }
2527 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2528 final InferenceContext inferenceContext, final List<Type> ts) {
2529 if (inferenceContext.free(ts)) {
2530 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2531 @Override
2532 public void typesInferred(InferenceContext inferenceContext) {
2533 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2534 }
2535 });
2536 } else {
2537 for (Type t : ts) {
2538 rs.checkAccessibleType(env, t);
2539 }
2540 }
2541 }
2543 /**
2544 * Lambda/method reference have a special check context that ensures
2545 * that i.e. a lambda return type is compatible with the expected
2546 * type according to both the inherited context and the assignment
2547 * context.
2548 */
2549 class FunctionalReturnContext extends Check.NestedCheckContext {
2551 FunctionalReturnContext(CheckContext enclosingContext) {
2552 super(enclosingContext);
2553 }
2555 @Override
2556 public boolean compatible(Type found, Type req, Warner warn) {
2557 //return type must be compatible in both current context and assignment context
2558 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn);
2559 }
2561 @Override
2562 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2563 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2564 }
2565 }
2567 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2569 JCExpression expr;
2571 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2572 super(enclosingContext);
2573 this.expr = expr;
2574 }
2576 @Override
2577 public boolean compatible(Type found, Type req, Warner warn) {
2578 //a void return is compatible with an expression statement lambda
2579 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2580 super.compatible(found, req, warn);
2581 }
2582 }
2584 /**
2585 * Lambda compatibility. Check that given return types, thrown types, parameter types
2586 * are compatible with the expected functional interface descriptor. This means that:
2587 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2588 * types must be compatible with the return type of the expected descriptor.
2589 */
2590 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2591 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2593 //return values have already been checked - but if lambda has no return
2594 //values, we must ensure that void/value compatibility is correct;
2595 //this amounts at checking that, if a lambda body can complete normally,
2596 //the descriptor's return type must be void
2597 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2598 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2599 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2600 diags.fragment("missing.ret.val", returnType)));
2601 }
2603 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2604 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2605 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2606 }
2607 }
2609 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2610 * static field and that lambda has type annotations, these annotations will
2611 * also be stored at these fake clinit methods.
2612 *
2613 * LambdaToMethod also use fake clinit methods so they can be reused.
2614 * Also as LTM is a phase subsequent to attribution, the methods from
2615 * clinits can be safely removed by LTM to save memory.
2616 */
2617 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2619 public MethodSymbol removeClinit(ClassSymbol sym) {
2620 return clinits.remove(sym);
2621 }
2623 /* This method returns an environment to be used to attribute a lambda
2624 * expression.
2625 *
2626 * The owner of this environment is a method symbol. If the current owner
2627 * is not a method, for example if the lambda is used to initialize
2628 * a field, then if the field is:
2629 *
2630 * - an instance field, we use the first constructor.
2631 * - a static field, we create a fake clinit method.
2632 */
2633 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2634 Env<AttrContext> lambdaEnv;
2635 Symbol owner = env.info.scope.owner;
2636 if (owner.kind == VAR && owner.owner.kind == TYP) {
2637 //field initializer
2638 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2639 ClassSymbol enclClass = owner.enclClass();
2640 /* if the field isn't static, then we can get the first constructor
2641 * and use it as the owner of the environment. This is what
2642 * LTM code is doing to look for type annotations so we are fine.
2643 */
2644 if ((owner.flags() & STATIC) == 0) {
2645 for (Symbol s : enclClass.members_field.getElementsByName(names.init)) {
2646 lambdaEnv.info.scope.owner = s;
2647 break;
2648 }
2649 } else {
2650 /* if the field is static then we need to create a fake clinit
2651 * method, this method can later be reused by LTM.
2652 */
2653 MethodSymbol clinit = clinits.get(enclClass);
2654 if (clinit == null) {
2655 Type clinitType = new MethodType(List.<Type>nil(),
2656 syms.voidType, List.<Type>nil(), syms.methodClass);
2657 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2658 names.clinit, clinitType, enclClass);
2659 clinit.params = List.<VarSymbol>nil();
2660 clinits.put(enclClass, clinit);
2661 }
2662 lambdaEnv.info.scope.owner = clinit;
2663 }
2664 } else {
2665 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2666 }
2667 return lambdaEnv;
2668 }
2670 @Override
2671 public void visitReference(final JCMemberReference that) {
2672 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2673 if (pt().hasTag(NONE)) {
2674 //method reference only allowed in assignment or method invocation/cast context
2675 log.error(that.pos(), "unexpected.mref");
2676 }
2677 result = that.type = types.createErrorType(pt());
2678 return;
2679 }
2680 final Env<AttrContext> localEnv = env.dup(that);
2681 try {
2682 //attribute member reference qualifier - if this is a constructor
2683 //reference, the expected kind must be a type
2684 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2686 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2687 exprType = chk.checkConstructorRefType(that.expr, exprType);
2688 if (!exprType.isErroneous() &&
2689 exprType.isRaw() &&
2690 that.typeargs != null) {
2691 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2692 diags.fragment("mref.infer.and.explicit.params"));
2693 exprType = types.createErrorType(exprType);
2694 }
2695 }
2697 if (exprType.isErroneous()) {
2698 //if the qualifier expression contains problems,
2699 //give up attribution of method reference
2700 result = that.type = exprType;
2701 return;
2702 }
2704 if (TreeInfo.isStaticSelector(that.expr, names)) {
2705 //if the qualifier is a type, validate it; raw warning check is
2706 //omitted as we don't know at this stage as to whether this is a
2707 //raw selector (because of inference)
2708 chk.validate(that.expr, env, false);
2709 }
2711 //attrib type-arguments
2712 List<Type> typeargtypes = List.nil();
2713 if (that.typeargs != null) {
2714 typeargtypes = attribTypes(that.typeargs, localEnv);
2715 }
2717 Type desc;
2718 Type currentTarget = pt();
2719 boolean isTargetSerializable =
2720 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2721 isSerializable(currentTarget);
2722 if (currentTarget != Type.recoveryType) {
2723 currentTarget = targetChecker.visit(currentTarget, that);
2724 desc = types.findDescriptorType(currentTarget);
2725 } else {
2726 currentTarget = Type.recoveryType;
2727 desc = fallbackDescriptorType(that);
2728 }
2730 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
2731 List<Type> argtypes = desc.getParameterTypes();
2732 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2734 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2735 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2736 }
2738 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2739 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2740 try {
2741 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
2742 that.name, argtypes, typeargtypes, referenceCheck,
2743 resultInfo.checkContext.inferenceContext(),
2744 resultInfo.checkContext.deferredAttrContext().mode);
2745 } finally {
2746 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2747 }
2749 Symbol refSym = refResult.fst;
2750 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2752 if (refSym.kind != MTH) {
2753 boolean targetError;
2754 switch (refSym.kind) {
2755 case ABSENT_MTH:
2756 targetError = false;
2757 break;
2758 case WRONG_MTH:
2759 case WRONG_MTHS:
2760 case AMBIGUOUS:
2761 case HIDDEN:
2762 case STATICERR:
2763 case MISSING_ENCL:
2764 case WRONG_STATICNESS:
2765 targetError = true;
2766 break;
2767 default:
2768 Assert.error("unexpected result kind " + refSym.kind);
2769 targetError = false;
2770 }
2772 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2773 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2775 JCDiagnostic.DiagnosticType diagKind = targetError ?
2776 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2778 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2779 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2781 if (targetError && currentTarget == Type.recoveryType) {
2782 //a target error doesn't make sense during recovery stage
2783 //as we don't know what actual parameter types are
2784 result = that.type = currentTarget;
2785 return;
2786 } else {
2787 if (targetError) {
2788 resultInfo.checkContext.report(that, diag);
2789 } else {
2790 log.report(diag);
2791 }
2792 result = that.type = types.createErrorType(currentTarget);
2793 return;
2794 }
2795 }
2797 that.sym = refSym.baseSymbol();
2798 that.kind = lookupHelper.referenceKind(that.sym);
2799 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2801 if (desc.getReturnType() == Type.recoveryType) {
2802 // stop here
2803 result = that.type = currentTarget;
2804 return;
2805 }
2807 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2809 if (that.getMode() == ReferenceMode.INVOKE &&
2810 TreeInfo.isStaticSelector(that.expr, names) &&
2811 that.kind.isUnbound() &&
2812 !desc.getParameterTypes().head.isParameterized()) {
2813 chk.checkRaw(that.expr, localEnv);
2814 }
2816 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2817 exprType.getTypeArguments().nonEmpty()) {
2818 //static ref with class type-args
2819 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2820 diags.fragment("static.mref.with.targs"));
2821 result = that.type = types.createErrorType(currentTarget);
2822 return;
2823 }
2825 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2826 !that.kind.isUnbound()) {
2827 //no static bound mrefs
2828 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2829 diags.fragment("static.bound.mref"));
2830 result = that.type = types.createErrorType(currentTarget);
2831 return;
2832 }
2834 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2835 // Check that super-qualified symbols are not abstract (JLS)
2836 rs.checkNonAbstract(that.pos(), that.sym);
2837 }
2839 if (isTargetSerializable) {
2840 chk.checkElemAccessFromSerializableLambda(that);
2841 }
2842 }
2844 ResultInfo checkInfo =
2845 resultInfo.dup(newMethodTemplate(
2846 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2847 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
2848 new FunctionalReturnContext(resultInfo.checkContext));
2850 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2852 if (that.kind.isUnbound() &&
2853 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2854 //re-generate inference constraints for unbound receiver
2855 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
2856 //cannot happen as this has already been checked - we just need
2857 //to regenerate the inference constraints, as that has been lost
2858 //as a result of the call to inferenceContext.save()
2859 Assert.error("Can't get here");
2860 }
2861 }
2863 if (!refType.isErroneous()) {
2864 refType = types.createMethodTypeWithReturn(refType,
2865 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2866 }
2868 //go ahead with standard method reference compatibility check - note that param check
2869 //is a no-op (as this has been taken care during method applicability)
2870 boolean isSpeculativeRound =
2871 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2872 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2873 if (!isSpeculativeRound) {
2874 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
2875 }
2876 result = check(that, currentTarget, VAL, resultInfo);
2877 } catch (Types.FunctionDescriptorLookupError ex) {
2878 JCDiagnostic cause = ex.getDiagnostic();
2879 resultInfo.checkContext.report(that, cause);
2880 result = that.type = types.createErrorType(pt());
2881 return;
2882 }
2883 }
2884 //where
2885 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2886 //if this is a constructor reference, the expected kind must be a type
2887 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2888 }
2891 @SuppressWarnings("fallthrough")
2892 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2893 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2895 Type resType;
2896 switch (tree.getMode()) {
2897 case NEW:
2898 if (!tree.expr.type.isRaw()) {
2899 resType = tree.expr.type;
2900 break;
2901 }
2902 default:
2903 resType = refType.getReturnType();
2904 }
2906 Type incompatibleReturnType = resType;
2908 if (returnType.hasTag(VOID)) {
2909 incompatibleReturnType = null;
2910 }
2912 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2913 if (resType.isErroneous() ||
2914 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2915 incompatibleReturnType = null;
2916 }
2917 }
2919 if (incompatibleReturnType != null) {
2920 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2921 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2922 }
2924 if (!speculativeAttr) {
2925 List<Type> thrownTypes = checkContext.inferenceContext().asUndetVars(descriptor.getThrownTypes());
2926 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2927 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2928 }
2929 }
2930 }
2932 /**
2933 * Set functional type info on the underlying AST. Note: as the target descriptor
2934 * might contain inference variables, we might need to register an hook in the
2935 * current inference context.
2936 */
2937 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2938 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2939 if (checkContext.inferenceContext().free(descriptorType)) {
2940 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2941 public void typesInferred(InferenceContext inferenceContext) {
2942 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2943 inferenceContext.asInstType(primaryTarget), checkContext);
2944 }
2945 });
2946 } else {
2947 ListBuffer<Type> targets = new ListBuffer<>();
2948 if (pt.hasTag(CLASS)) {
2949 if (pt.isCompound()) {
2950 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2951 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2952 if (t != primaryTarget) {
2953 targets.append(types.removeWildcards(t));
2954 }
2955 }
2956 } else {
2957 targets.append(types.removeWildcards(primaryTarget));
2958 }
2959 }
2960 fExpr.targets = targets.toList();
2961 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2962 pt != Type.recoveryType) {
2963 //check that functional interface class is well-formed
2964 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2965 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2966 if (csym != null) {
2967 chk.checkImplementations(env.tree, csym, csym);
2968 }
2969 }
2970 }
2971 }
2973 public void visitParens(JCParens tree) {
2974 Type owntype = attribTree(tree.expr, env, resultInfo);
2975 result = check(tree, owntype, pkind(), resultInfo);
2976 Symbol sym = TreeInfo.symbol(tree);
2977 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2978 log.error(tree.pos(), "illegal.start.of.type");
2979 }
2981 public void visitAssign(JCAssign tree) {
2982 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2983 Type capturedType = capture(owntype);
2984 attribExpr(tree.rhs, env, owntype);
2985 result = check(tree, capturedType, VAL, resultInfo);
2986 }
2988 public void visitAssignop(JCAssignOp tree) {
2989 // Attribute arguments.
2990 Type owntype = attribTree(tree.lhs, env, varInfo);
2991 Type operand = attribExpr(tree.rhs, env);
2992 // Find operator.
2993 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2994 tree.pos(), tree.getTag().noAssignOp(), env,
2995 owntype, operand);
2997 if (operator.kind == MTH &&
2998 !owntype.isErroneous() &&
2999 !operand.isErroneous()) {
3000 chk.checkOperator(tree.pos(),
3001 (OperatorSymbol)operator,
3002 tree.getTag().noAssignOp(),
3003 owntype,
3004 operand);
3005 chk.checkDivZero(tree.rhs.pos(), operator, operand);
3006 chk.checkCastable(tree.rhs.pos(),
3007 operator.type.getReturnType(),
3008 owntype);
3009 }
3010 result = check(tree, owntype, VAL, resultInfo);
3011 }
3013 public void visitUnary(JCUnary tree) {
3014 // Attribute arguments.
3015 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3016 ? attribTree(tree.arg, env, varInfo)
3017 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3019 // Find operator.
3020 Symbol operator = tree.operator =
3021 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
3023 Type owntype = types.createErrorType(tree.type);
3024 if (operator.kind == MTH &&
3025 !argtype.isErroneous()) {
3026 owntype = (tree.getTag().isIncOrDecUnaryOp())
3027 ? tree.arg.type
3028 : operator.type.getReturnType();
3029 int opc = ((OperatorSymbol)operator).opcode;
3031 // If the argument is constant, fold it.
3032 if (argtype.constValue() != null) {
3033 Type ctype = cfolder.fold1(opc, argtype);
3034 if (ctype != null) {
3035 owntype = cfolder.coerce(ctype, owntype);
3036 }
3037 }
3038 }
3039 result = check(tree, owntype, VAL, resultInfo);
3040 }
3042 public void visitBinary(JCBinary tree) {
3043 // Attribute arguments.
3044 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3045 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3047 // Find operator.
3048 Symbol operator = tree.operator =
3049 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3051 Type owntype = types.createErrorType(tree.type);
3052 if (operator.kind == MTH &&
3053 !left.isErroneous() &&
3054 !right.isErroneous()) {
3055 owntype = operator.type.getReturnType();
3056 // This will figure out when unboxing can happen and
3057 // choose the right comparison operator.
3058 int opc = chk.checkOperator(tree.lhs.pos(),
3059 (OperatorSymbol)operator,
3060 tree.getTag(),
3061 left,
3062 right);
3064 // If both arguments are constants, fold them.
3065 if (left.constValue() != null && right.constValue() != null) {
3066 Type ctype = cfolder.fold2(opc, left, right);
3067 if (ctype != null) {
3068 owntype = cfolder.coerce(ctype, owntype);
3069 }
3070 }
3072 // Check that argument types of a reference ==, != are
3073 // castable to each other, (JLS 15.21). Note: unboxing
3074 // comparisons will not have an acmp* opc at this point.
3075 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3076 if (!types.isEqualityComparable(left, right,
3077 new Warner(tree.pos()))) {
3078 log.error(tree.pos(), "incomparable.types", left, right);
3079 }
3080 }
3082 chk.checkDivZero(tree.rhs.pos(), operator, right);
3083 }
3084 result = check(tree, owntype, VAL, resultInfo);
3085 }
3087 public void visitTypeCast(final JCTypeCast tree) {
3088 Type clazztype = attribType(tree.clazz, env);
3089 chk.validate(tree.clazz, env, false);
3090 //a fresh environment is required for 292 inference to work properly ---
3091 //see Infer.instantiatePolymorphicSignatureInstance()
3092 Env<AttrContext> localEnv = env.dup(tree);
3093 //should we propagate the target type?
3094 final ResultInfo castInfo;
3095 JCExpression expr = TreeInfo.skipParens(tree.expr);
3096 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3097 if (isPoly) {
3098 //expression is a poly - we need to propagate target type info
3099 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3100 @Override
3101 public boolean compatible(Type found, Type req, Warner warn) {
3102 return types.isCastable(found, req, warn);
3103 }
3104 });
3105 } else {
3106 //standalone cast - target-type info is not propagated
3107 castInfo = unknownExprInfo;
3108 }
3109 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3110 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3111 if (exprtype.constValue() != null)
3112 owntype = cfolder.coerce(exprtype, owntype);
3113 result = check(tree, capture(owntype), VAL, resultInfo);
3114 if (!isPoly)
3115 chk.checkRedundantCast(localEnv, tree);
3116 }
3118 public void visitTypeTest(JCInstanceOf tree) {
3119 Type exprtype = chk.checkNullOrRefType(
3120 tree.expr.pos(), attribExpr(tree.expr, env));
3121 Type clazztype = attribType(tree.clazz, env);
3122 if (!clazztype.hasTag(TYPEVAR)) {
3123 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3124 }
3125 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3126 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3127 clazztype = types.createErrorType(clazztype);
3128 }
3129 chk.validate(tree.clazz, env, false);
3130 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3131 result = check(tree, syms.booleanType, VAL, resultInfo);
3132 }
3134 public void visitIndexed(JCArrayAccess tree) {
3135 Type owntype = types.createErrorType(tree.type);
3136 Type atype = attribExpr(tree.indexed, env);
3137 attribExpr(tree.index, env, syms.intType);
3138 if (types.isArray(atype))
3139 owntype = types.elemtype(atype);
3140 else if (!atype.hasTag(ERROR))
3141 log.error(tree.pos(), "array.req.but.found", atype);
3142 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3143 result = check(tree, owntype, VAR, resultInfo);
3144 }
3146 public void visitIdent(JCIdent tree) {
3147 Symbol sym;
3149 // Find symbol
3150 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3151 // If we are looking for a method, the prototype `pt' will be a
3152 // method type with the type of the call's arguments as parameters.
3153 env.info.pendingResolutionPhase = null;
3154 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3155 } else if (tree.sym != null && tree.sym.kind != VAR) {
3156 sym = tree.sym;
3157 } else {
3158 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3159 }
3160 tree.sym = sym;
3162 // (1) Also find the environment current for the class where
3163 // sym is defined (`symEnv').
3164 // Only for pre-tiger versions (1.4 and earlier):
3165 // (2) Also determine whether we access symbol out of an anonymous
3166 // class in a this or super call. This is illegal for instance
3167 // members since such classes don't carry a this$n link.
3168 // (`noOuterThisPath').
3169 Env<AttrContext> symEnv = env;
3170 boolean noOuterThisPath = false;
3171 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3172 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3173 sym.owner.kind == TYP &&
3174 tree.name != names._this && tree.name != names._super) {
3176 // Find environment in which identifier is defined.
3177 while (symEnv.outer != null &&
3178 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3179 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3180 noOuterThisPath = !allowAnonOuterThis;
3181 symEnv = symEnv.outer;
3182 }
3183 }
3185 // If symbol is a variable, ...
3186 if (sym.kind == VAR) {
3187 VarSymbol v = (VarSymbol)sym;
3189 // ..., evaluate its initializer, if it has one, and check for
3190 // illegal forward reference.
3191 checkInit(tree, env, v, false);
3193 // If we are expecting a variable (as opposed to a value), check
3194 // that the variable is assignable in the current environment.
3195 if (pkind() == VAR)
3196 checkAssignable(tree.pos(), v, null, env);
3197 }
3199 // In a constructor body,
3200 // if symbol is a field or instance method, check that it is
3201 // not accessed before the supertype constructor is called.
3202 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3203 (sym.kind & (VAR | MTH)) != 0 &&
3204 sym.owner.kind == TYP &&
3205 (sym.flags() & STATIC) == 0) {
3206 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3207 }
3208 Env<AttrContext> env1 = env;
3209 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3210 // If the found symbol is inaccessible, then it is
3211 // accessed through an enclosing instance. Locate this
3212 // enclosing instance:
3213 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3214 env1 = env1.outer;
3215 }
3217 if (env.info.isSerializable) {
3218 chk.checkElemAccessFromSerializableLambda(tree);
3219 }
3221 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3222 }
3224 public void visitSelect(JCFieldAccess tree) {
3225 // Determine the expected kind of the qualifier expression.
3226 int skind = 0;
3227 if (tree.name == names._this || tree.name == names._super ||
3228 tree.name == names._class)
3229 {
3230 skind = TYP;
3231 } else {
3232 if ((pkind() & PCK) != 0) skind = skind | PCK;
3233 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3234 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3235 }
3237 // Attribute the qualifier expression, and determine its symbol (if any).
3238 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3239 if ((pkind() & (PCK | TYP)) == 0)
3240 site = capture(site); // Capture field access
3242 // don't allow T.class T[].class, etc
3243 if (skind == TYP) {
3244 Type elt = site;
3245 while (elt.hasTag(ARRAY))
3246 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3247 if (elt.hasTag(TYPEVAR)) {
3248 log.error(tree.pos(), "type.var.cant.be.deref");
3249 result = types.createErrorType(tree.type);
3250 return;
3251 }
3252 }
3254 // If qualifier symbol is a type or `super', assert `selectSuper'
3255 // for the selection. This is relevant for determining whether
3256 // protected symbols are accessible.
3257 Symbol sitesym = TreeInfo.symbol(tree.selected);
3258 boolean selectSuperPrev = env.info.selectSuper;
3259 env.info.selectSuper =
3260 sitesym != null &&
3261 sitesym.name == names._super;
3263 // Determine the symbol represented by the selection.
3264 env.info.pendingResolutionPhase = null;
3265 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3266 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3267 site = capture(site);
3268 sym = selectSym(tree, sitesym, site, env, resultInfo);
3269 }
3270 boolean varArgs = env.info.lastResolveVarargs();
3271 tree.sym = sym;
3273 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3274 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3275 site = capture(site);
3276 }
3278 // If that symbol is a variable, ...
3279 if (sym.kind == VAR) {
3280 VarSymbol v = (VarSymbol)sym;
3282 // ..., evaluate its initializer, if it has one, and check for
3283 // illegal forward reference.
3284 checkInit(tree, env, v, true);
3286 // If we are expecting a variable (as opposed to a value), check
3287 // that the variable is assignable in the current environment.
3288 if (pkind() == VAR)
3289 checkAssignable(tree.pos(), v, tree.selected, env);
3290 }
3292 if (sitesym != null &&
3293 sitesym.kind == VAR &&
3294 ((VarSymbol)sitesym).isResourceVariable() &&
3295 sym.kind == MTH &&
3296 sym.name.equals(names.close) &&
3297 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3298 env.info.lint.isEnabled(LintCategory.TRY)) {
3299 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3300 }
3302 // Disallow selecting a type from an expression
3303 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3304 tree.type = check(tree.selected, pt(),
3305 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3306 }
3308 if (isType(sitesym)) {
3309 if (sym.name == names._this) {
3310 // If `C' is the currently compiled class, check that
3311 // C.this' does not appear in a call to a super(...)
3312 if (env.info.isSelfCall &&
3313 site.tsym == env.enclClass.sym) {
3314 chk.earlyRefError(tree.pos(), sym);
3315 }
3316 } else {
3317 // Check if type-qualified fields or methods are static (JLS)
3318 if ((sym.flags() & STATIC) == 0 &&
3319 !env.next.tree.hasTag(REFERENCE) &&
3320 sym.name != names._super &&
3321 (sym.kind == VAR || sym.kind == MTH)) {
3322 rs.accessBase(rs.new StaticError(sym),
3323 tree.pos(), site, sym.name, true);
3324 }
3325 }
3326 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3327 // If the qualified item is not a type and the selected item is static, report
3328 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3329 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3330 }
3332 // If we are selecting an instance member via a `super', ...
3333 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3335 // Check that super-qualified symbols are not abstract (JLS)
3336 rs.checkNonAbstract(tree.pos(), sym);
3338 if (site.isRaw()) {
3339 // Determine argument types for site.
3340 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3341 if (site1 != null) site = site1;
3342 }
3343 }
3345 if (env.info.isSerializable) {
3346 chk.checkElemAccessFromSerializableLambda(tree);
3347 }
3349 env.info.selectSuper = selectSuperPrev;
3350 result = checkId(tree, site, sym, env, resultInfo);
3351 }
3352 //where
3353 /** Determine symbol referenced by a Select expression,
3354 *
3355 * @param tree The select tree.
3356 * @param site The type of the selected expression,
3357 * @param env The current environment.
3358 * @param resultInfo The current result.
3359 */
3360 private Symbol selectSym(JCFieldAccess tree,
3361 Symbol location,
3362 Type site,
3363 Env<AttrContext> env,
3364 ResultInfo resultInfo) {
3365 DiagnosticPosition pos = tree.pos();
3366 Name name = tree.name;
3367 switch (site.getTag()) {
3368 case PACKAGE:
3369 return rs.accessBase(
3370 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3371 pos, location, site, name, true);
3372 case ARRAY:
3373 case CLASS:
3374 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3375 return rs.resolveQualifiedMethod(
3376 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3377 } else if (name == names._this || name == names._super) {
3378 return rs.resolveSelf(pos, env, site.tsym, name);
3379 } else if (name == names._class) {
3380 // In this case, we have already made sure in
3381 // visitSelect that qualifier expression is a type.
3382 Type t = syms.classType;
3383 List<Type> typeargs = allowGenerics
3384 ? List.of(types.erasure(site))
3385 : List.<Type>nil();
3386 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3387 return new VarSymbol(
3388 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3389 } else {
3390 // We are seeing a plain identifier as selector.
3391 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3392 if ((resultInfo.pkind & ERRONEOUS) == 0)
3393 sym = rs.accessBase(sym, pos, location, site, name, true);
3394 return sym;
3395 }
3396 case WILDCARD:
3397 throw new AssertionError(tree);
3398 case TYPEVAR:
3399 // Normally, site.getUpperBound() shouldn't be null.
3400 // It should only happen during memberEnter/attribBase
3401 // when determining the super type which *must* beac
3402 // done before attributing the type variables. In
3403 // other words, we are seeing this illegal program:
3404 // class B<T> extends A<T.foo> {}
3405 Symbol sym = (site.getUpperBound() != null)
3406 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3407 : null;
3408 if (sym == null) {
3409 log.error(pos, "type.var.cant.be.deref");
3410 return syms.errSymbol;
3411 } else {
3412 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3413 rs.new AccessError(env, site, sym) :
3414 sym;
3415 rs.accessBase(sym2, pos, location, site, name, true);
3416 return sym;
3417 }
3418 case ERROR:
3419 // preserve identifier names through errors
3420 return types.createErrorType(name, site.tsym, site).tsym;
3421 default:
3422 // The qualifier expression is of a primitive type -- only
3423 // .class is allowed for these.
3424 if (name == names._class) {
3425 // In this case, we have already made sure in Select that
3426 // qualifier expression is a type.
3427 Type t = syms.classType;
3428 Type arg = types.boxedClass(site).type;
3429 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3430 return new VarSymbol(
3431 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3432 } else {
3433 log.error(pos, "cant.deref", site);
3434 return syms.errSymbol;
3435 }
3436 }
3437 }
3439 /** Determine type of identifier or select expression and check that
3440 * (1) the referenced symbol is not deprecated
3441 * (2) the symbol's type is safe (@see checkSafe)
3442 * (3) if symbol is a variable, check that its type and kind are
3443 * compatible with the prototype and protokind.
3444 * (4) if symbol is an instance field of a raw type,
3445 * which is being assigned to, issue an unchecked warning if its
3446 * type changes under erasure.
3447 * (5) if symbol is an instance method of a raw type, issue an
3448 * unchecked warning if its argument types change under erasure.
3449 * If checks succeed:
3450 * If symbol is a constant, return its constant type
3451 * else if symbol is a method, return its result type
3452 * otherwise return its type.
3453 * Otherwise return errType.
3454 *
3455 * @param tree The syntax tree representing the identifier
3456 * @param site If this is a select, the type of the selected
3457 * expression, otherwise the type of the current class.
3458 * @param sym The symbol representing the identifier.
3459 * @param env The current environment.
3460 * @param resultInfo The expected result
3461 */
3462 Type checkId(JCTree tree,
3463 Type site,
3464 Symbol sym,
3465 Env<AttrContext> env,
3466 ResultInfo resultInfo) {
3467 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3468 checkMethodId(tree, site, sym, env, resultInfo) :
3469 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3470 }
3472 Type checkMethodId(JCTree tree,
3473 Type site,
3474 Symbol sym,
3475 Env<AttrContext> env,
3476 ResultInfo resultInfo) {
3477 boolean isPolymorhicSignature =
3478 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3479 return isPolymorhicSignature ?
3480 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3481 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3482 }
3484 Type checkSigPolyMethodId(JCTree tree,
3485 Type site,
3486 Symbol sym,
3487 Env<AttrContext> env,
3488 ResultInfo resultInfo) {
3489 //recover original symbol for signature polymorphic methods
3490 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3491 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3492 return sym.type;
3493 }
3495 Type checkMethodIdInternal(JCTree tree,
3496 Type site,
3497 Symbol sym,
3498 Env<AttrContext> env,
3499 ResultInfo resultInfo) {
3500 if ((resultInfo.pkind & POLY) != 0) {
3501 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3502 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3503 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3504 return owntype;
3505 } else {
3506 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3507 }
3508 }
3510 Type checkIdInternal(JCTree tree,
3511 Type site,
3512 Symbol sym,
3513 Type pt,
3514 Env<AttrContext> env,
3515 ResultInfo resultInfo) {
3516 if (pt.isErroneous()) {
3517 return types.createErrorType(site);
3518 }
3519 Type owntype; // The computed type of this identifier occurrence.
3520 switch (sym.kind) {
3521 case TYP:
3522 // For types, the computed type equals the symbol's type,
3523 // except for two situations:
3524 owntype = sym.type;
3525 if (owntype.hasTag(CLASS)) {
3526 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3527 Type ownOuter = owntype.getEnclosingType();
3529 // (a) If the symbol's type is parameterized, erase it
3530 // because no type parameters were given.
3531 // We recover generic outer type later in visitTypeApply.
3532 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3533 owntype = types.erasure(owntype);
3534 }
3536 // (b) If the symbol's type is an inner class, then
3537 // we have to interpret its outer type as a superclass
3538 // of the site type. Example:
3539 //
3540 // class Tree<A> { class Visitor { ... } }
3541 // class PointTree extends Tree<Point> { ... }
3542 // ...PointTree.Visitor...
3543 //
3544 // Then the type of the last expression above is
3545 // Tree<Point>.Visitor.
3546 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3547 Type normOuter = site;
3548 if (normOuter.hasTag(CLASS)) {
3549 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3550 }
3551 if (normOuter == null) // perhaps from an import
3552 normOuter = types.erasure(ownOuter);
3553 if (normOuter != ownOuter)
3554 owntype = new ClassType(
3555 normOuter, List.<Type>nil(), owntype.tsym);
3556 }
3557 }
3558 break;
3559 case VAR:
3560 VarSymbol v = (VarSymbol)sym;
3561 // Test (4): if symbol is an instance field of a raw type,
3562 // which is being assigned to, issue an unchecked warning if
3563 // its type changes under erasure.
3564 if (allowGenerics &&
3565 resultInfo.pkind == VAR &&
3566 v.owner.kind == TYP &&
3567 (v.flags() & STATIC) == 0 &&
3568 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3569 Type s = types.asOuterSuper(site, v.owner);
3570 if (s != null &&
3571 s.isRaw() &&
3572 !types.isSameType(v.type, v.erasure(types))) {
3573 chk.warnUnchecked(tree.pos(),
3574 "unchecked.assign.to.var",
3575 v, s);
3576 }
3577 }
3578 // The computed type of a variable is the type of the
3579 // variable symbol, taken as a member of the site type.
3580 owntype = (sym.owner.kind == TYP &&
3581 sym.name != names._this && sym.name != names._super)
3582 ? types.memberType(site, sym)
3583 : sym.type;
3585 // If the variable is a constant, record constant value in
3586 // computed type.
3587 if (v.getConstValue() != null && isStaticReference(tree))
3588 owntype = owntype.constType(v.getConstValue());
3590 if (resultInfo.pkind == VAL) {
3591 owntype = capture(owntype); // capture "names as expressions"
3592 }
3593 break;
3594 case MTH: {
3595 owntype = checkMethod(site, sym,
3596 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3597 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3598 resultInfo.pt.getTypeArguments());
3599 break;
3600 }
3601 case PCK: case ERR:
3602 owntype = sym.type;
3603 break;
3604 default:
3605 throw new AssertionError("unexpected kind: " + sym.kind +
3606 " in tree " + tree);
3607 }
3609 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3610 // (for constructors, the error was given when the constructor was
3611 // resolved)
3613 if (sym.name != names.init) {
3614 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3615 chk.checkSunAPI(tree.pos(), sym);
3616 chk.checkProfile(tree.pos(), sym);
3617 }
3619 // Test (3): if symbol is a variable, check that its type and
3620 // kind are compatible with the prototype and protokind.
3621 return check(tree, owntype, sym.kind, resultInfo);
3622 }
3624 /** Check that variable is initialized and evaluate the variable's
3625 * initializer, if not yet done. Also check that variable is not
3626 * referenced before it is defined.
3627 * @param tree The tree making up the variable reference.
3628 * @param env The current environment.
3629 * @param v The variable's symbol.
3630 */
3631 private void checkInit(JCTree tree,
3632 Env<AttrContext> env,
3633 VarSymbol v,
3634 boolean onlyWarning) {
3635 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3636 // tree.pos + " " + v.pos + " " +
3637 // Resolve.isStatic(env));//DEBUG
3639 // A forward reference is diagnosed if the declaration position
3640 // of the variable is greater than the current tree position
3641 // and the tree and variable definition occur in the same class
3642 // definition. Note that writes don't count as references.
3643 // This check applies only to class and instance
3644 // variables. Local variables follow different scope rules,
3645 // and are subject to definite assignment checking.
3646 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3647 v.owner.kind == TYP &&
3648 canOwnInitializer(owner(env)) &&
3649 v.owner == env.info.scope.owner.enclClass() &&
3650 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3651 (!env.tree.hasTag(ASSIGN) ||
3652 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3653 String suffix = (env.info.enclVar == v) ?
3654 "self.ref" : "forward.ref";
3655 if (!onlyWarning || isStaticEnumField(v)) {
3656 log.error(tree.pos(), "illegal." + suffix);
3657 } else if (useBeforeDeclarationWarning) {
3658 log.warning(tree.pos(), suffix, v);
3659 }
3660 }
3662 v.getConstValue(); // ensure initializer is evaluated
3664 checkEnumInitializer(tree, env, v);
3665 }
3667 /**
3668 * Check for illegal references to static members of enum. In
3669 * an enum type, constructors and initializers may not
3670 * reference its static members unless they are constant.
3671 *
3672 * @param tree The tree making up the variable reference.
3673 * @param env The current environment.
3674 * @param v The variable's symbol.
3675 * @jls section 8.9 Enums
3676 */
3677 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3678 // JLS:
3679 //
3680 // "It is a compile-time error to reference a static field
3681 // of an enum type that is not a compile-time constant
3682 // (15.28) from constructors, instance initializer blocks,
3683 // or instance variable initializer expressions of that
3684 // type. It is a compile-time error for the constructors,
3685 // instance initializer blocks, or instance variable
3686 // initializer expressions of an enum constant e to refer
3687 // to itself or to an enum constant of the same type that
3688 // is declared to the right of e."
3689 if (isStaticEnumField(v)) {
3690 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3692 if (enclClass == null || enclClass.owner == null)
3693 return;
3695 // See if the enclosing class is the enum (or a
3696 // subclass thereof) declaring v. If not, this
3697 // reference is OK.
3698 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3699 return;
3701 // If the reference isn't from an initializer, then
3702 // the reference is OK.
3703 if (!Resolve.isInitializer(env))
3704 return;
3706 log.error(tree.pos(), "illegal.enum.static.ref");
3707 }
3708 }
3710 /** Is the given symbol a static, non-constant field of an Enum?
3711 * Note: enum literals should not be regarded as such
3712 */
3713 private boolean isStaticEnumField(VarSymbol v) {
3714 return Flags.isEnum(v.owner) &&
3715 Flags.isStatic(v) &&
3716 !Flags.isConstant(v) &&
3717 v.name != names._class;
3718 }
3720 /** Can the given symbol be the owner of code which forms part
3721 * if class initialization? This is the case if the symbol is
3722 * a type or field, or if the symbol is the synthetic method.
3723 * owning a block.
3724 */
3725 private boolean canOwnInitializer(Symbol sym) {
3726 return
3727 (sym.kind & (VAR | TYP)) != 0 ||
3728 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3729 }
3731 Warner noteWarner = new Warner();
3733 /**
3734 * Check that method arguments conform to its instantiation.
3735 **/
3736 public Type checkMethod(Type site,
3737 final Symbol sym,
3738 ResultInfo resultInfo,
3739 Env<AttrContext> env,
3740 final List<JCExpression> argtrees,
3741 List<Type> argtypes,
3742 List<Type> typeargtypes) {
3743 // Test (5): if symbol is an instance method of a raw type, issue
3744 // an unchecked warning if its argument types change under erasure.
3745 if (allowGenerics &&
3746 (sym.flags() & STATIC) == 0 &&
3747 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3748 Type s = types.asOuterSuper(site, sym.owner);
3749 if (s != null && s.isRaw() &&
3750 !types.isSameTypes(sym.type.getParameterTypes(),
3751 sym.erasure(types).getParameterTypes())) {
3752 chk.warnUnchecked(env.tree.pos(),
3753 "unchecked.call.mbr.of.raw.type",
3754 sym, s);
3755 }
3756 }
3758 if (env.info.defaultSuperCallSite != null) {
3759 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3760 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3761 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3762 List<MethodSymbol> icand_sup =
3763 types.interfaceCandidates(sup, (MethodSymbol)sym);
3764 if (icand_sup.nonEmpty() &&
3765 icand_sup.head != sym &&
3766 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3767 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3768 diags.fragment("overridden.default", sym, sup));
3769 break;
3770 }
3771 }
3772 env.info.defaultSuperCallSite = null;
3773 }
3775 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3776 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3777 if (app.meth.hasTag(SELECT) &&
3778 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3779 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3780 }
3781 }
3783 // Compute the identifier's instantiated type.
3784 // For methods, we need to compute the instance type by
3785 // Resolve.instantiate from the symbol's type as well as
3786 // any type arguments and value arguments.
3787 noteWarner.clear();
3788 try {
3789 Type owntype = rs.checkMethod(
3790 env,
3791 site,
3792 sym,
3793 resultInfo,
3794 argtypes,
3795 typeargtypes,
3796 noteWarner);
3798 DeferredAttr.DeferredTypeMap checkDeferredMap =
3799 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3801 argtypes = Type.map(argtypes, checkDeferredMap);
3803 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3804 chk.warnUnchecked(env.tree.pos(),
3805 "unchecked.meth.invocation.applied",
3806 kindName(sym),
3807 sym.name,
3808 rs.methodArguments(sym.type.getParameterTypes()),
3809 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3810 kindName(sym.location()),
3811 sym.location());
3812 owntype = new MethodType(owntype.getParameterTypes(),
3813 types.erasure(owntype.getReturnType()),
3814 types.erasure(owntype.getThrownTypes()),
3815 syms.methodClass);
3816 }
3818 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3819 resultInfo.checkContext.inferenceContext());
3820 } catch (Infer.InferenceException ex) {
3821 //invalid target type - propagate exception outwards or report error
3822 //depending on the current check context
3823 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3824 return types.createErrorType(site);
3825 } catch (Resolve.InapplicableMethodException ex) {
3826 final JCDiagnostic diag = ex.getDiagnostic();
3827 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3828 @Override
3829 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3830 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3831 }
3832 };
3833 List<Type> argtypes2 = Type.map(argtypes,
3834 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3835 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3836 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3837 log.report(errDiag);
3838 return types.createErrorType(site);
3839 }
3840 }
3842 public void visitLiteral(JCLiteral tree) {
3843 result = check(
3844 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3845 }
3846 //where
3847 /** Return the type of a literal with given type tag.
3848 */
3849 Type litType(TypeTag tag) {
3850 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3851 }
3853 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3854 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3855 }
3857 public void visitTypeArray(JCArrayTypeTree tree) {
3858 Type etype = attribType(tree.elemtype, env);
3859 Type type = new ArrayType(etype, syms.arrayClass);
3860 result = check(tree, type, TYP, resultInfo);
3861 }
3863 /** Visitor method for parameterized types.
3864 * Bound checking is left until later, since types are attributed
3865 * before supertype structure is completely known
3866 */
3867 public void visitTypeApply(JCTypeApply tree) {
3868 Type owntype = types.createErrorType(tree.type);
3870 // Attribute functor part of application and make sure it's a class.
3871 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3873 // Attribute type parameters
3874 List<Type> actuals = attribTypes(tree.arguments, env);
3876 if (clazztype.hasTag(CLASS)) {
3877 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3878 if (actuals.isEmpty()) //diamond
3879 actuals = formals;
3881 if (actuals.length() == formals.length()) {
3882 List<Type> a = actuals;
3883 List<Type> f = formals;
3884 while (a.nonEmpty()) {
3885 a.head = a.head.withTypeVar(f.head);
3886 a = a.tail;
3887 f = f.tail;
3888 }
3889 // Compute the proper generic outer
3890 Type clazzOuter = clazztype.getEnclosingType();
3891 if (clazzOuter.hasTag(CLASS)) {
3892 Type site;
3893 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3894 if (clazz.hasTag(IDENT)) {
3895 site = env.enclClass.sym.type;
3896 } else if (clazz.hasTag(SELECT)) {
3897 site = ((JCFieldAccess) clazz).selected.type;
3898 } else throw new AssertionError(""+tree);
3899 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3900 if (site.hasTag(CLASS))
3901 site = types.asOuterSuper(site, clazzOuter.tsym);
3902 if (site == null)
3903 site = types.erasure(clazzOuter);
3904 clazzOuter = site;
3905 }
3906 }
3907 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3908 } else {
3909 if (formals.length() != 0) {
3910 log.error(tree.pos(), "wrong.number.type.args",
3911 Integer.toString(formals.length()));
3912 } else {
3913 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3914 }
3915 owntype = types.createErrorType(tree.type);
3916 }
3917 }
3918 result = check(tree, owntype, TYP, resultInfo);
3919 }
3921 public void visitTypeUnion(JCTypeUnion tree) {
3922 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3923 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3924 for (JCExpression typeTree : tree.alternatives) {
3925 Type ctype = attribType(typeTree, env);
3926 ctype = chk.checkType(typeTree.pos(),
3927 chk.checkClassType(typeTree.pos(), ctype),
3928 syms.throwableType);
3929 if (!ctype.isErroneous()) {
3930 //check that alternatives of a union type are pairwise
3931 //unrelated w.r.t. subtyping
3932 if (chk.intersects(ctype, multicatchTypes.toList())) {
3933 for (Type t : multicatchTypes) {
3934 boolean sub = types.isSubtype(ctype, t);
3935 boolean sup = types.isSubtype(t, ctype);
3936 if (sub || sup) {
3937 //assume 'a' <: 'b'
3938 Type a = sub ? ctype : t;
3939 Type b = sub ? t : ctype;
3940 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3941 }
3942 }
3943 }
3944 multicatchTypes.append(ctype);
3945 if (all_multicatchTypes != null)
3946 all_multicatchTypes.append(ctype);
3947 } else {
3948 if (all_multicatchTypes == null) {
3949 all_multicatchTypes = new ListBuffer<>();
3950 all_multicatchTypes.appendList(multicatchTypes);
3951 }
3952 all_multicatchTypes.append(ctype);
3953 }
3954 }
3955 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3956 if (t.hasTag(CLASS)) {
3957 List<Type> alternatives =
3958 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3959 t = new UnionClassType((ClassType) t, alternatives);
3960 }
3961 tree.type = result = t;
3962 }
3964 public void visitTypeIntersection(JCTypeIntersection tree) {
3965 attribTypes(tree.bounds, env);
3966 tree.type = result = checkIntersection(tree, tree.bounds);
3967 }
3969 public void visitTypeParameter(JCTypeParameter tree) {
3970 TypeVar typeVar = (TypeVar) tree.type;
3972 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3973 annotateType(tree, tree.annotations);
3974 }
3976 if (!typeVar.bound.isErroneous()) {
3977 //fixup type-parameter bound computed in 'attribTypeVariables'
3978 typeVar.bound = checkIntersection(tree, tree.bounds);
3979 }
3980 }
3982 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3983 Set<Type> boundSet = new HashSet<Type>();
3984 if (bounds.nonEmpty()) {
3985 // accept class or interface or typevar as first bound.
3986 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3987 boundSet.add(types.erasure(bounds.head.type));
3988 if (bounds.head.type.isErroneous()) {
3989 return bounds.head.type;
3990 }
3991 else if (bounds.head.type.hasTag(TYPEVAR)) {
3992 // if first bound was a typevar, do not accept further bounds.
3993 if (bounds.tail.nonEmpty()) {
3994 log.error(bounds.tail.head.pos(),
3995 "type.var.may.not.be.followed.by.other.bounds");
3996 return bounds.head.type;
3997 }
3998 } else {
3999 // if first bound was a class or interface, accept only interfaces
4000 // as further bounds.
4001 for (JCExpression bound : bounds.tail) {
4002 bound.type = checkBase(bound.type, bound, env, false, true, false);
4003 if (bound.type.isErroneous()) {
4004 bounds = List.of(bound);
4005 }
4006 else if (bound.type.hasTag(CLASS)) {
4007 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4008 }
4009 }
4010 }
4011 }
4013 if (bounds.length() == 0) {
4014 return syms.objectType;
4015 } else if (bounds.length() == 1) {
4016 return bounds.head.type;
4017 } else {
4018 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
4019 // ... the variable's bound is a class type flagged COMPOUND
4020 // (see comment for TypeVar.bound).
4021 // In this case, generate a class tree that represents the
4022 // bound class, ...
4023 JCExpression extending;
4024 List<JCExpression> implementing;
4025 if (!bounds.head.type.isInterface()) {
4026 extending = bounds.head;
4027 implementing = bounds.tail;
4028 } else {
4029 extending = null;
4030 implementing = bounds;
4031 }
4032 JCClassDecl cd = make.at(tree).ClassDef(
4033 make.Modifiers(PUBLIC | ABSTRACT),
4034 names.empty, List.<JCTypeParameter>nil(),
4035 extending, implementing, List.<JCTree>nil());
4037 ClassSymbol c = (ClassSymbol)owntype.tsym;
4038 Assert.check((c.flags() & COMPOUND) != 0);
4039 cd.sym = c;
4040 c.sourcefile = env.toplevel.sourcefile;
4042 // ... and attribute the bound class
4043 c.flags_field |= UNATTRIBUTED;
4044 Env<AttrContext> cenv = enter.classEnv(cd, env);
4045 enter.typeEnvs.put(c, cenv);
4046 attribClass(c);
4047 return owntype;
4048 }
4049 }
4051 public void visitWildcard(JCWildcard tree) {
4052 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4053 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4054 ? syms.objectType
4055 : attribType(tree.inner, env);
4056 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4057 tree.kind.kind,
4058 syms.boundClass),
4059 TYP, resultInfo);
4060 }
4062 public void visitAnnotation(JCAnnotation tree) {
4063 Assert.error("should be handled in Annotate");
4064 }
4066 public void visitAnnotatedType(JCAnnotatedType tree) {
4067 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4068 this.attribAnnotationTypes(tree.annotations, env);
4069 annotateType(tree, tree.annotations);
4070 result = tree.type = underlyingType;
4071 }
4073 /**
4074 * Apply the annotations to the particular type.
4075 */
4076 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4077 annotate.typeAnnotation(new Annotate.Worker() {
4078 @Override
4079 public String toString() {
4080 return "annotate " + annotations + " onto " + tree;
4081 }
4082 @Override
4083 public void run() {
4084 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4085 if (annotations.size() == compounds.size()) {
4086 // All annotations were successfully converted into compounds
4087 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4088 }
4089 }
4090 });
4091 }
4093 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4094 if (annotations.isEmpty()) {
4095 return List.nil();
4096 }
4098 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4099 for (JCAnnotation anno : annotations) {
4100 if (anno.attribute != null) {
4101 // TODO: this null-check is only needed for an obscure
4102 // ordering issue, where annotate.flush is called when
4103 // the attribute is not set yet. For an example failure
4104 // try the referenceinfos/NestedTypes.java test.
4105 // Any better solutions?
4106 buf.append((Attribute.TypeCompound) anno.attribute);
4107 }
4108 // Eventually we will want to throw an exception here, but
4109 // we can't do that just yet, because it gets triggered
4110 // when attempting to attach an annotation that isn't
4111 // defined.
4112 }
4113 return buf.toList();
4114 }
4116 public void visitErroneous(JCErroneous tree) {
4117 if (tree.errs != null)
4118 for (JCTree err : tree.errs)
4119 attribTree(err, env, new ResultInfo(ERR, pt()));
4120 result = tree.type = syms.errType;
4121 }
4123 /** Default visitor method for all other trees.
4124 */
4125 public void visitTree(JCTree tree) {
4126 throw new AssertionError();
4127 }
4129 /**
4130 * Attribute an env for either a top level tree or class declaration.
4131 */
4132 public void attrib(Env<AttrContext> env) {
4133 if (env.tree.hasTag(TOPLEVEL))
4134 attribTopLevel(env);
4135 else
4136 attribClass(env.tree.pos(), env.enclClass.sym);
4137 }
4139 /**
4140 * Attribute a top level tree. These trees are encountered when the
4141 * package declaration has annotations.
4142 */
4143 public void attribTopLevel(Env<AttrContext> env) {
4144 JCCompilationUnit toplevel = env.toplevel;
4145 try {
4146 annotate.flush();
4147 } catch (CompletionFailure ex) {
4148 chk.completionError(toplevel.pos(), ex);
4149 }
4150 }
4152 /** Main method: attribute class definition associated with given class symbol.
4153 * reporting completion failures at the given position.
4154 * @param pos The source position at which completion errors are to be
4155 * reported.
4156 * @param c The class symbol whose definition will be attributed.
4157 */
4158 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4159 try {
4160 annotate.flush();
4161 attribClass(c);
4162 } catch (CompletionFailure ex) {
4163 chk.completionError(pos, ex);
4164 }
4165 }
4167 /** Attribute class definition associated with given class symbol.
4168 * @param c The class symbol whose definition will be attributed.
4169 */
4170 void attribClass(ClassSymbol c) throws CompletionFailure {
4171 if (c.type.hasTag(ERROR)) return;
4173 // Check for cycles in the inheritance graph, which can arise from
4174 // ill-formed class files.
4175 chk.checkNonCyclic(null, c.type);
4177 Type st = types.supertype(c.type);
4178 if ((c.flags_field & Flags.COMPOUND) == 0) {
4179 // First, attribute superclass.
4180 if (st.hasTag(CLASS))
4181 attribClass((ClassSymbol)st.tsym);
4183 // Next attribute owner, if it is a class.
4184 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4185 attribClass((ClassSymbol)c.owner);
4186 }
4188 // The previous operations might have attributed the current class
4189 // if there was a cycle. So we test first whether the class is still
4190 // UNATTRIBUTED.
4191 if ((c.flags_field & UNATTRIBUTED) != 0) {
4192 c.flags_field &= ~UNATTRIBUTED;
4194 // Get environment current at the point of class definition.
4195 Env<AttrContext> env = enter.typeEnvs.get(c);
4197 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4198 // because the annotations were not available at the time the env was created. Therefore,
4199 // we look up the environment chain for the first enclosing environment for which the
4200 // lint value is set. Typically, this is the parent env, but might be further if there
4201 // are any envs created as a result of TypeParameter nodes.
4202 Env<AttrContext> lintEnv = env;
4203 while (lintEnv.info.lint == null)
4204 lintEnv = lintEnv.next;
4206 // Having found the enclosing lint value, we can initialize the lint value for this class
4207 env.info.lint = lintEnv.info.lint.augment(c);
4209 Lint prevLint = chk.setLint(env.info.lint);
4210 JavaFileObject prev = log.useSource(c.sourcefile);
4211 ResultInfo prevReturnRes = env.info.returnResult;
4213 try {
4214 deferredLintHandler.flush(env.tree);
4215 env.info.returnResult = null;
4216 // java.lang.Enum may not be subclassed by a non-enum
4217 if (st.tsym == syms.enumSym &&
4218 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4219 log.error(env.tree.pos(), "enum.no.subclassing");
4221 // Enums may not be extended by source-level classes
4222 if (st.tsym != null &&
4223 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4224 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4225 log.error(env.tree.pos(), "enum.types.not.extensible");
4226 }
4228 if (isSerializable(c.type)) {
4229 env.info.isSerializable = true;
4230 }
4232 attribClassBody(env, c);
4234 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4235 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4236 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4237 } finally {
4238 env.info.returnResult = prevReturnRes;
4239 log.useSource(prev);
4240 chk.setLint(prevLint);
4241 }
4243 }
4244 }
4246 public void visitImport(JCImport tree) {
4247 // nothing to do
4248 }
4250 /** Finish the attribution of a class. */
4251 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4252 JCClassDecl tree = (JCClassDecl)env.tree;
4253 Assert.check(c == tree.sym);
4255 // Validate type parameters, supertype and interfaces.
4256 attribStats(tree.typarams, env);
4257 if (!c.isAnonymous()) {
4258 //already checked if anonymous
4259 chk.validate(tree.typarams, env);
4260 chk.validate(tree.extending, env);
4261 chk.validate(tree.implementing, env);
4262 }
4264 // If this is a non-abstract class, check that it has no abstract
4265 // methods or unimplemented methods of an implemented interface.
4266 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4267 if (!relax)
4268 chk.checkAllDefined(tree.pos(), c);
4269 }
4271 if ((c.flags() & ANNOTATION) != 0) {
4272 if (tree.implementing.nonEmpty())
4273 log.error(tree.implementing.head.pos(),
4274 "cant.extend.intf.annotation");
4275 if (tree.typarams.nonEmpty())
4276 log.error(tree.typarams.head.pos(),
4277 "intf.annotation.cant.have.type.params");
4279 // If this annotation has a @Repeatable, validate
4280 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4281 if (repeatable != null) {
4282 // get diagnostic position for error reporting
4283 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4284 Assert.checkNonNull(cbPos);
4286 chk.validateRepeatable(c, repeatable, cbPos);
4287 }
4288 } else {
4289 // Check that all extended classes and interfaces
4290 // are compatible (i.e. no two define methods with same arguments
4291 // yet different return types). (JLS 8.4.6.3)
4292 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4293 if (allowDefaultMethods) {
4294 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4295 }
4296 }
4298 // Check that class does not import the same parameterized interface
4299 // with two different argument lists.
4300 chk.checkClassBounds(tree.pos(), c.type);
4302 tree.type = c.type;
4304 for (List<JCTypeParameter> l = tree.typarams;
4305 l.nonEmpty(); l = l.tail) {
4306 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4307 }
4309 // Check that a generic class doesn't extend Throwable
4310 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4311 log.error(tree.extending.pos(), "generic.throwable");
4313 // Check that all methods which implement some
4314 // method conform to the method they implement.
4315 chk.checkImplementations(tree);
4317 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4318 checkAutoCloseable(tree.pos(), env, c.type);
4320 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4321 // Attribute declaration
4322 attribStat(l.head, env);
4323 // Check that declarations in inner classes are not static (JLS 8.1.2)
4324 // Make an exception for static constants.
4325 if (c.owner.kind != PCK &&
4326 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4327 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4328 Symbol sym = null;
4329 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4330 if (sym == null ||
4331 sym.kind != VAR ||
4332 ((VarSymbol) sym).getConstValue() == null)
4333 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4334 }
4335 }
4337 // Check for cycles among non-initial constructors.
4338 chk.checkCyclicConstructors(tree);
4340 // Check for cycles among annotation elements.
4341 chk.checkNonCyclicElements(tree);
4343 // Check for proper use of serialVersionUID
4344 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4345 isSerializable(c.type) &&
4346 (c.flags() & Flags.ENUM) == 0 &&
4347 checkForSerial(c)) {
4348 checkSerialVersionUID(tree, c);
4349 }
4350 if (allowTypeAnnos) {
4351 // Correctly organize the postions of the type annotations
4352 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4354 // Check type annotations applicability rules
4355 validateTypeAnnotations(tree, false);
4356 }
4357 }
4358 // where
4359 boolean checkForSerial(ClassSymbol c) {
4360 if ((c.flags() & ABSTRACT) == 0) {
4361 return true;
4362 } else {
4363 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4364 }
4365 }
4367 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4368 @Override
4369 public boolean accepts(Symbol s) {
4370 return s.kind == Kinds.MTH &&
4371 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4372 }
4373 };
4375 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4376 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4377 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4378 if (types.isSameType(al.head.annotationType.type, t))
4379 return al.head.pos();
4380 }
4382 return null;
4383 }
4385 /** check if a type is a subtype of Serializable, if that is available. */
4386 boolean isSerializable(Type t) {
4387 try {
4388 syms.serializableType.complete();
4389 }
4390 catch (CompletionFailure e) {
4391 return false;
4392 }
4393 return types.isSubtype(t, syms.serializableType);
4394 }
4396 /** Check that an appropriate serialVersionUID member is defined. */
4397 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4399 // check for presence of serialVersionUID
4400 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4401 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4402 if (e.scope == null) {
4403 log.warning(LintCategory.SERIAL,
4404 tree.pos(), "missing.SVUID", c);
4405 return;
4406 }
4408 // check that it is static final
4409 VarSymbol svuid = (VarSymbol)e.sym;
4410 if ((svuid.flags() & (STATIC | FINAL)) !=
4411 (STATIC | FINAL))
4412 log.warning(LintCategory.SERIAL,
4413 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4415 // check that it is long
4416 else if (!svuid.type.hasTag(LONG))
4417 log.warning(LintCategory.SERIAL,
4418 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4420 // check constant
4421 else if (svuid.getConstValue() == null)
4422 log.warning(LintCategory.SERIAL,
4423 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4424 }
4426 private Type capture(Type type) {
4427 return types.capture(type);
4428 }
4430 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4431 tree.accept(new TypeAnnotationsValidator(sigOnly));
4432 }
4433 //where
4434 private final class TypeAnnotationsValidator extends TreeScanner {
4436 private final boolean sigOnly;
4437 public TypeAnnotationsValidator(boolean sigOnly) {
4438 this.sigOnly = sigOnly;
4439 }
4441 public void visitAnnotation(JCAnnotation tree) {
4442 chk.validateTypeAnnotation(tree, false);
4443 super.visitAnnotation(tree);
4444 }
4445 public void visitAnnotatedType(JCAnnotatedType tree) {
4446 if (!tree.underlyingType.type.isErroneous()) {
4447 super.visitAnnotatedType(tree);
4448 }
4449 }
4450 public void visitTypeParameter(JCTypeParameter tree) {
4451 chk.validateTypeAnnotations(tree.annotations, true);
4452 scan(tree.bounds);
4453 // Don't call super.
4454 // This is needed because above we call validateTypeAnnotation with
4455 // false, which would forbid annotations on type parameters.
4456 // super.visitTypeParameter(tree);
4457 }
4458 public void visitMethodDef(JCMethodDecl tree) {
4459 if (tree.recvparam != null &&
4460 !tree.recvparam.vartype.type.isErroneous()) {
4461 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4462 tree.recvparam.vartype.type.tsym);
4463 }
4464 if (tree.restype != null && tree.restype.type != null) {
4465 validateAnnotatedType(tree.restype, tree.restype.type);
4466 }
4467 if (sigOnly) {
4468 scan(tree.mods);
4469 scan(tree.restype);
4470 scan(tree.typarams);
4471 scan(tree.recvparam);
4472 scan(tree.params);
4473 scan(tree.thrown);
4474 } else {
4475 scan(tree.defaultValue);
4476 scan(tree.body);
4477 }
4478 }
4479 public void visitVarDef(final JCVariableDecl tree) {
4480 if (tree.sym != null && tree.sym.type != null)
4481 validateAnnotatedType(tree.vartype, tree.sym.type);
4482 scan(tree.mods);
4483 scan(tree.vartype);
4484 if (!sigOnly) {
4485 scan(tree.init);
4486 }
4487 }
4488 public void visitTypeCast(JCTypeCast tree) {
4489 if (tree.clazz != null && tree.clazz.type != null)
4490 validateAnnotatedType(tree.clazz, tree.clazz.type);
4491 super.visitTypeCast(tree);
4492 }
4493 public void visitTypeTest(JCInstanceOf tree) {
4494 if (tree.clazz != null && tree.clazz.type != null)
4495 validateAnnotatedType(tree.clazz, tree.clazz.type);
4496 super.visitTypeTest(tree);
4497 }
4498 public void visitNewClass(JCNewClass tree) {
4499 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4500 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4501 tree.clazz.type.tsym);
4502 }
4503 if (tree.def != null) {
4504 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4505 }
4506 if (tree.clazz.type != null) {
4507 validateAnnotatedType(tree.clazz, tree.clazz.type);
4508 }
4509 super.visitNewClass(tree);
4510 }
4511 public void visitNewArray(JCNewArray tree) {
4512 if (tree.elemtype != null && tree.elemtype.type != null) {
4513 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4514 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4515 tree.elemtype.type.tsym);
4516 }
4517 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4518 }
4519 super.visitNewArray(tree);
4520 }
4521 public void visitClassDef(JCClassDecl tree) {
4522 if (sigOnly) {
4523 scan(tree.mods);
4524 scan(tree.typarams);
4525 scan(tree.extending);
4526 scan(tree.implementing);
4527 }
4528 for (JCTree member : tree.defs) {
4529 if (member.hasTag(Tag.CLASSDEF)) {
4530 continue;
4531 }
4532 scan(member);
4533 }
4534 }
4535 public void visitBlock(JCBlock tree) {
4536 if (!sigOnly) {
4537 scan(tree.stats);
4538 }
4539 }
4541 /* I would want to model this after
4542 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4543 * and override visitSelect and visitTypeApply.
4544 * However, we only set the annotated type in the top-level type
4545 * of the symbol.
4546 * Therefore, we need to override each individual location where a type
4547 * can occur.
4548 */
4549 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4550 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4552 if (type.isPrimitiveOrVoid()) {
4553 return;
4554 }
4556 JCTree enclTr = errtree;
4557 Type enclTy = type;
4559 boolean repeat = true;
4560 while (repeat) {
4561 if (enclTr.hasTag(TYPEAPPLY)) {
4562 List<Type> tyargs = enclTy.getTypeArguments();
4563 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4564 if (trargs.length() > 0) {
4565 // Nothing to do for diamonds
4566 if (tyargs.length() == trargs.length()) {
4567 for (int i = 0; i < tyargs.length(); ++i) {
4568 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4569 }
4570 }
4571 // If the lengths don't match, it's either a diamond
4572 // or some nested type that redundantly provides
4573 // type arguments in the tree.
4574 }
4576 // Look at the clazz part of a generic type
4577 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4578 }
4580 if (enclTr.hasTag(SELECT)) {
4581 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4582 if (enclTy != null &&
4583 !enclTy.hasTag(NONE)) {
4584 enclTy = enclTy.getEnclosingType();
4585 }
4586 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4587 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4588 if (enclTy == null ||
4589 enclTy.hasTag(NONE)) {
4590 if (at.getAnnotations().size() == 1) {
4591 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4592 } else {
4593 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4594 for (JCAnnotation an : at.getAnnotations()) {
4595 comps.add(an.attribute);
4596 }
4597 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4598 }
4599 repeat = false;
4600 }
4601 enclTr = at.underlyingType;
4602 // enclTy doesn't need to be changed
4603 } else if (enclTr.hasTag(IDENT)) {
4604 repeat = false;
4605 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4606 JCWildcard wc = (JCWildcard) enclTr;
4607 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4608 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4609 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4610 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4611 } else {
4612 // Nothing to do for UNBOUND
4613 }
4614 repeat = false;
4615 } else if (enclTr.hasTag(TYPEARRAY)) {
4616 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4617 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4618 repeat = false;
4619 } else if (enclTr.hasTag(TYPEUNION)) {
4620 JCTypeUnion ut = (JCTypeUnion) enclTr;
4621 for (JCTree t : ut.getTypeAlternatives()) {
4622 validateAnnotatedType(t, t.type);
4623 }
4624 repeat = false;
4625 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4626 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4627 for (JCTree t : it.getBounds()) {
4628 validateAnnotatedType(t, t.type);
4629 }
4630 repeat = false;
4631 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4632 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4633 repeat = false;
4634 } else {
4635 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4636 " within: "+ errtree + " with kind: " + errtree.getKind());
4637 }
4638 }
4639 }
4641 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
4642 Symbol sym) {
4643 // Ensure that no declaration annotations are present.
4644 // Note that a tree type might be an AnnotatedType with
4645 // empty annotations, if only declaration annotations were given.
4646 // This method will raise an error for such a type.
4647 for (JCAnnotation ai : annotations) {
4648 if (!ai.type.isErroneous() &&
4649 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
4650 log.error(ai.pos(), "annotation.type.not.applicable");
4651 }
4652 }
4653 }
4654 };
4656 // <editor-fold desc="post-attribution visitor">
4658 /**
4659 * Handle missing types/symbols in an AST. This routine is useful when
4660 * the compiler has encountered some errors (which might have ended up
4661 * terminating attribution abruptly); if the compiler is used in fail-over
4662 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4663 * prevents NPE to be progagated during subsequent compilation steps.
4664 */
4665 public void postAttr(JCTree tree) {
4666 new PostAttrAnalyzer().scan(tree);
4667 }
4669 class PostAttrAnalyzer extends TreeScanner {
4671 private void initTypeIfNeeded(JCTree that) {
4672 if (that.type == null) {
4673 if (that.hasTag(METHODDEF)) {
4674 that.type = dummyMethodType((JCMethodDecl)that);
4675 } else {
4676 that.type = syms.unknownType;
4677 }
4678 }
4679 }
4681 /* Construct a dummy method type. If we have a method declaration,
4682 * and the declared return type is void, then use that return type
4683 * instead of UNKNOWN to avoid spurious error messages in lambda
4684 * bodies (see:JDK-8041704).
4685 */
4686 private Type dummyMethodType(JCMethodDecl md) {
4687 Type restype = syms.unknownType;
4688 if (md != null && md.restype.hasTag(TYPEIDENT)) {
4689 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
4690 if (prim.typetag == VOID)
4691 restype = syms.voidType;
4692 }
4693 return new MethodType(List.<Type>nil(), restype,
4694 List.<Type>nil(), syms.methodClass);
4695 }
4696 private Type dummyMethodType() {
4697 return dummyMethodType(null);
4698 }
4700 @Override
4701 public void scan(JCTree tree) {
4702 if (tree == null) return;
4703 if (tree instanceof JCExpression) {
4704 initTypeIfNeeded(tree);
4705 }
4706 super.scan(tree);
4707 }
4709 @Override
4710 public void visitIdent(JCIdent that) {
4711 if (that.sym == null) {
4712 that.sym = syms.unknownSymbol;
4713 }
4714 }
4716 @Override
4717 public void visitSelect(JCFieldAccess that) {
4718 if (that.sym == null) {
4719 that.sym = syms.unknownSymbol;
4720 }
4721 super.visitSelect(that);
4722 }
4724 @Override
4725 public void visitClassDef(JCClassDecl that) {
4726 initTypeIfNeeded(that);
4727 if (that.sym == null) {
4728 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4729 }
4730 super.visitClassDef(that);
4731 }
4733 @Override
4734 public void visitMethodDef(JCMethodDecl that) {
4735 initTypeIfNeeded(that);
4736 if (that.sym == null) {
4737 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4738 }
4739 super.visitMethodDef(that);
4740 }
4742 @Override
4743 public void visitVarDef(JCVariableDecl that) {
4744 initTypeIfNeeded(that);
4745 if (that.sym == null) {
4746 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4747 that.sym.adr = 0;
4748 }
4749 super.visitVarDef(that);
4750 }
4752 @Override
4753 public void visitNewClass(JCNewClass that) {
4754 if (that.constructor == null) {
4755 that.constructor = new MethodSymbol(0, names.init,
4756 dummyMethodType(), syms.noSymbol);
4757 }
4758 if (that.constructorType == null) {
4759 that.constructorType = syms.unknownType;
4760 }
4761 super.visitNewClass(that);
4762 }
4764 @Override
4765 public void visitAssignop(JCAssignOp that) {
4766 if (that.operator == null) {
4767 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4768 -1, syms.noSymbol);
4769 }
4770 super.visitAssignop(that);
4771 }
4773 @Override
4774 public void visitBinary(JCBinary that) {
4775 if (that.operator == null) {
4776 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4777 -1, syms.noSymbol);
4778 }
4779 super.visitBinary(that);
4780 }
4782 @Override
4783 public void visitUnary(JCUnary that) {
4784 if (that.operator == null) {
4785 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4786 -1, syms.noSymbol);
4787 }
4788 super.visitUnary(that);
4789 }
4791 @Override
4792 public void visitLambda(JCLambda that) {
4793 super.visitLambda(that);
4794 if (that.targets == null) {
4795 that.targets = List.nil();
4796 }
4797 }
4799 @Override
4800 public void visitReference(JCMemberReference that) {
4801 super.visitReference(that);
4802 if (that.sym == null) {
4803 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
4804 syms.noSymbol);
4805 }
4806 if (that.targets == null) {
4807 that.targets = List.nil();
4808 }
4809 }
4810 }
4811 // </editor-fold>
4812 }
