Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@8acb838c9b79
src/share/classes/com/sun/tools/javac/comp/Attr.java
Tue, 26 Nov 2013 15:27:19 +0100
- author
- jlahoda
- date
- Tue, 26 Nov 2013 15:27:19 +0100
- changeset 2206
- 8acb838c9b79
- parent 2200
- 7c89d200781b
- child 2210
- a746587a1ff1
- permissions
- -rw-r--r--
8026374: javac accepts void as a method parameter
Summary: Changing Check.validate to reject void types.
Reviewed-by: jjg, vromero
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
34 import com.sun.source.tree.IdentifierTree;
35 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
36 import com.sun.source.tree.MemberSelectTree;
37 import com.sun.source.tree.TreeVisitor;
38 import com.sun.source.util.SimpleTreeVisitor;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.code.Type.*;
43 import com.sun.tools.javac.comp.Check.CheckContext;
44 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
45 import com.sun.tools.javac.comp.Infer.InferenceContext;
46 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.tree.*;
49 import com.sun.tools.javac.tree.JCTree.*;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
53 import com.sun.tools.javac.util.List;
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Flags.ANNOTATION;
56 import static com.sun.tools.javac.code.Flags.BLOCK;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
59 import static com.sun.tools.javac.code.TypeTag.*;
60 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
61 import static com.sun.tools.javac.tree.JCTree.Tag.*;
63 /** This is the main context-dependent analysis phase in GJC. It
64 * encompasses name resolution, type checking and constant folding as
65 * subtasks. Some subtasks involve auxiliary classes.
66 * @see Check
67 * @see Resolve
68 * @see ConstFold
69 * @see Infer
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Attr extends JCTree.Visitor {
77 protected static final Context.Key<Attr> attrKey =
78 new Context.Key<Attr>();
80 final Names names;
81 final Log log;
82 final Symtab syms;
83 final Resolve rs;
84 final Infer infer;
85 final DeferredAttr deferredAttr;
86 final Check chk;
87 final Flow flow;
88 final MemberEnter memberEnter;
89 final TreeMaker make;
90 final ConstFold cfolder;
91 final Enter enter;
92 final Target target;
93 final Types types;
94 final JCDiagnostic.Factory diags;
95 final Annotate annotate;
96 final TypeAnnotations typeAnnotations;
97 final DeferredLintHandler deferredLintHandler;
99 public static Attr instance(Context context) {
100 Attr instance = context.get(attrKey);
101 if (instance == null)
102 instance = new Attr(context);
103 return instance;
104 }
106 protected Attr(Context context) {
107 context.put(attrKey, this);
109 names = Names.instance(context);
110 log = Log.instance(context);
111 syms = Symtab.instance(context);
112 rs = Resolve.instance(context);
113 chk = Check.instance(context);
114 flow = Flow.instance(context);
115 memberEnter = MemberEnter.instance(context);
116 make = TreeMaker.instance(context);
117 enter = Enter.instance(context);
118 infer = Infer.instance(context);
119 deferredAttr = DeferredAttr.instance(context);
120 cfolder = ConstFold.instance(context);
121 target = Target.instance(context);
122 types = Types.instance(context);
123 diags = JCDiagnostic.Factory.instance(context);
124 annotate = Annotate.instance(context);
125 typeAnnotations = TypeAnnotations.instance(context);
126 deferredLintHandler = DeferredLintHandler.instance(context);
128 Options options = Options.instance(context);
130 Source source = Source.instance(context);
131 allowGenerics = source.allowGenerics();
132 allowVarargs = source.allowVarargs();
133 allowEnums = source.allowEnums();
134 allowBoxing = source.allowBoxing();
135 allowCovariantReturns = source.allowCovariantReturns();
136 allowAnonOuterThis = source.allowAnonOuterThis();
137 allowStringsInSwitch = source.allowStringsInSwitch();
138 allowPoly = source.allowPoly();
139 allowTypeAnnos = source.allowTypeAnnotations();
140 allowLambda = source.allowLambda();
141 allowDefaultMethods = source.allowDefaultMethods();
142 sourceName = source.name;
143 relax = (options.isSet("-retrofit") ||
144 options.isSet("-relax"));
145 findDiamonds = options.get("findDiamond") != null &&
146 source.allowDiamond();
147 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
148 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
150 statInfo = new ResultInfo(NIL, Type.noType);
151 varInfo = new ResultInfo(VAR, Type.noType);
152 unknownExprInfo = new ResultInfo(VAL, Type.noType);
153 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
154 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
155 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
156 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
157 }
159 /** Switch: relax some constraints for retrofit mode.
160 */
161 boolean relax;
163 /** Switch: support target-typing inference
164 */
165 boolean allowPoly;
167 /** Switch: support type annotations.
168 */
169 boolean allowTypeAnnos;
171 /** Switch: support generics?
172 */
173 boolean allowGenerics;
175 /** Switch: allow variable-arity methods.
176 */
177 boolean allowVarargs;
179 /** Switch: support enums?
180 */
181 boolean allowEnums;
183 /** Switch: support boxing and unboxing?
184 */
185 boolean allowBoxing;
187 /** Switch: support covariant result types?
188 */
189 boolean allowCovariantReturns;
191 /** Switch: support lambda expressions ?
192 */
193 boolean allowLambda;
195 /** Switch: support default methods ?
196 */
197 boolean allowDefaultMethods;
199 /** Switch: allow references to surrounding object from anonymous
200 * objects during constructor call?
201 */
202 boolean allowAnonOuterThis;
204 /** Switch: generates a warning if diamond can be safely applied
205 * to a given new expression
206 */
207 boolean findDiamonds;
209 /**
210 * Internally enables/disables diamond finder feature
211 */
212 static final boolean allowDiamondFinder = true;
214 /**
215 * Switch: warn about use of variable before declaration?
216 * RFE: 6425594
217 */
218 boolean useBeforeDeclarationWarning;
220 /**
221 * Switch: generate warnings whenever an anonymous inner class that is convertible
222 * to a lambda expression is found
223 */
224 boolean identifyLambdaCandidate;
226 /**
227 * Switch: allow strings in switch?
228 */
229 boolean allowStringsInSwitch;
231 /**
232 * Switch: name of source level; used for error reporting.
233 */
234 String sourceName;
236 /** Check kind and type of given tree against protokind and prototype.
237 * If check succeeds, store type in tree and return it.
238 * If check fails, store errType in tree and return it.
239 * No checks are performed if the prototype is a method type.
240 * It is not necessary in this case since we know that kind and type
241 * are correct.
242 *
243 * @param tree The tree whose kind and type is checked
244 * @param ownkind The computed kind of the tree
245 * @param resultInfo The expected result of the tree
246 */
247 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
248 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
249 Type owntype = found;
250 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
251 if (allowPoly && inferenceContext.free(found)) {
252 if ((ownkind & ~resultInfo.pkind) == 0) {
253 owntype = resultInfo.check(tree, inferenceContext.asFree(owntype));
254 } else {
255 log.error(tree.pos(), "unexpected.type",
256 kindNames(resultInfo.pkind),
257 kindName(ownkind));
258 owntype = types.createErrorType(owntype);
259 }
260 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
261 @Override
262 public void typesInferred(InferenceContext inferenceContext) {
263 ResultInfo pendingResult =
264 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
265 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
266 }
267 });
268 return tree.type = resultInfo.pt;
269 } else {
270 if ((ownkind & ~resultInfo.pkind) == 0) {
271 owntype = resultInfo.check(tree, owntype);
272 } else {
273 log.error(tree.pos(), "unexpected.type",
274 kindNames(resultInfo.pkind),
275 kindName(ownkind));
276 owntype = types.createErrorType(owntype);
277 }
278 }
279 }
280 tree.type = owntype;
281 return owntype;
282 }
284 /** Is given blank final variable assignable, i.e. in a scope where it
285 * may be assigned to even though it is final?
286 * @param v The blank final variable.
287 * @param env The current environment.
288 */
289 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
290 Symbol owner = owner(env);
291 // owner refers to the innermost variable, method or
292 // initializer block declaration at this point.
293 return
294 v.owner == owner
295 ||
296 ((owner.name == names.init || // i.e. we are in a constructor
297 owner.kind == VAR || // i.e. we are in a variable initializer
298 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
299 &&
300 v.owner == owner.owner
301 &&
302 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
303 }
305 /**
306 * Return the innermost enclosing owner symbol in a given attribution context
307 */
308 Symbol owner(Env<AttrContext> env) {
309 while (true) {
310 switch (env.tree.getTag()) {
311 case VARDEF:
312 //a field can be owner
313 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
314 if (vsym.owner.kind == TYP) {
315 return vsym;
316 }
317 break;
318 case METHODDEF:
319 //method def is always an owner
320 return ((JCMethodDecl)env.tree).sym;
321 case CLASSDEF:
322 //class def is always an owner
323 return ((JCClassDecl)env.tree).sym;
324 case BLOCK:
325 //static/instance init blocks are owner
326 Symbol blockSym = env.info.scope.owner;
327 if ((blockSym.flags() & BLOCK) != 0) {
328 return blockSym;
329 }
330 break;
331 case TOPLEVEL:
332 //toplevel is always an owner (for pkge decls)
333 return env.info.scope.owner;
334 }
335 Assert.checkNonNull(env.next);
336 env = env.next;
337 }
338 }
340 /** Check that variable can be assigned to.
341 * @param pos The current source code position.
342 * @param v The assigned varaible
343 * @param base If the variable is referred to in a Select, the part
344 * to the left of the `.', null otherwise.
345 * @param env The current environment.
346 */
347 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
348 if ((v.flags() & FINAL) != 0 &&
349 ((v.flags() & HASINIT) != 0
350 ||
351 !((base == null ||
352 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
353 isAssignableAsBlankFinal(v, env)))) {
354 if (v.isResourceVariable()) { //TWR resource
355 log.error(pos, "try.resource.may.not.be.assigned", v);
356 } else {
357 log.error(pos, "cant.assign.val.to.final.var", v);
358 }
359 }
360 }
362 /** Does tree represent a static reference to an identifier?
363 * It is assumed that tree is either a SELECT or an IDENT.
364 * We have to weed out selects from non-type names here.
365 * @param tree The candidate tree.
366 */
367 boolean isStaticReference(JCTree tree) {
368 if (tree.hasTag(SELECT)) {
369 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
370 if (lsym == null || lsym.kind != TYP) {
371 return false;
372 }
373 }
374 return true;
375 }
377 /** Is this symbol a type?
378 */
379 static boolean isType(Symbol sym) {
380 return sym != null && sym.kind == TYP;
381 }
383 /** The current `this' symbol.
384 * @param env The current environment.
385 */
386 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
387 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
388 }
390 /** Attribute a parsed identifier.
391 * @param tree Parsed identifier name
392 * @param topLevel The toplevel to use
393 */
394 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
395 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
396 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
397 syms.errSymbol.name,
398 null, null, null, null);
399 localEnv.enclClass.sym = syms.errSymbol;
400 return tree.accept(identAttributer, localEnv);
401 }
402 // where
403 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
404 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
405 @Override
406 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
407 Symbol site = visit(node.getExpression(), env);
408 if (site.kind == ERR || site.kind == ABSENT_TYP)
409 return site;
410 Name name = (Name)node.getIdentifier();
411 if (site.kind == PCK) {
412 env.toplevel.packge = (PackageSymbol)site;
413 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
414 } else {
415 env.enclClass.sym = (ClassSymbol)site;
416 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
417 }
418 }
420 @Override
421 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
422 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
423 }
424 }
426 public Type coerce(Type etype, Type ttype) {
427 return cfolder.coerce(etype, ttype);
428 }
430 public Type attribType(JCTree node, TypeSymbol sym) {
431 Env<AttrContext> env = enter.typeEnvs.get(sym);
432 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
433 return attribTree(node, localEnv, unknownTypeInfo);
434 }
436 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
437 // Attribute qualifying package or class.
438 JCFieldAccess s = (JCFieldAccess)tree.qualid;
439 return attribTree(s.selected,
440 env,
441 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
442 Type.noType));
443 }
445 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
446 breakTree = tree;
447 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
448 try {
449 attribExpr(expr, env);
450 } catch (BreakAttr b) {
451 return b.env;
452 } catch (AssertionError ae) {
453 if (ae.getCause() instanceof BreakAttr) {
454 return ((BreakAttr)(ae.getCause())).env;
455 } else {
456 throw ae;
457 }
458 } finally {
459 breakTree = null;
460 log.useSource(prev);
461 }
462 return env;
463 }
465 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
466 breakTree = tree;
467 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
468 try {
469 attribStat(stmt, env);
470 } catch (BreakAttr b) {
471 return b.env;
472 } catch (AssertionError ae) {
473 if (ae.getCause() instanceof BreakAttr) {
474 return ((BreakAttr)(ae.getCause())).env;
475 } else {
476 throw ae;
477 }
478 } finally {
479 breakTree = null;
480 log.useSource(prev);
481 }
482 return env;
483 }
485 private JCTree breakTree = null;
487 private static class BreakAttr extends RuntimeException {
488 static final long serialVersionUID = -6924771130405446405L;
489 private Env<AttrContext> env;
490 private BreakAttr(Env<AttrContext> env) {
491 this.env = env;
492 }
493 }
495 class ResultInfo {
496 final int pkind;
497 final Type pt;
498 final CheckContext checkContext;
500 ResultInfo(int pkind, Type pt) {
501 this(pkind, pt, chk.basicHandler);
502 }
504 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
505 this.pkind = pkind;
506 this.pt = pt;
507 this.checkContext = checkContext;
508 }
510 protected Type check(final DiagnosticPosition pos, final Type found) {
511 return chk.checkType(pos, found, pt, checkContext);
512 }
514 protected ResultInfo dup(Type newPt) {
515 return new ResultInfo(pkind, newPt, checkContext);
516 }
518 protected ResultInfo dup(CheckContext newContext) {
519 return new ResultInfo(pkind, pt, newContext);
520 }
522 @Override
523 public String toString() {
524 if (pt != null) {
525 return pt.toString();
526 } else {
527 return "";
528 }
529 }
530 }
532 class RecoveryInfo extends ResultInfo {
534 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
535 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
536 @Override
537 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
538 return deferredAttrContext;
539 }
540 @Override
541 public boolean compatible(Type found, Type req, Warner warn) {
542 return true;
543 }
544 @Override
545 public void report(DiagnosticPosition pos, JCDiagnostic details) {
546 chk.basicHandler.report(pos, details);
547 }
548 });
549 }
550 }
552 final ResultInfo statInfo;
553 final ResultInfo varInfo;
554 final ResultInfo unknownAnyPolyInfo;
555 final ResultInfo unknownExprInfo;
556 final ResultInfo unknownTypeInfo;
557 final ResultInfo unknownTypeExprInfo;
558 final ResultInfo recoveryInfo;
560 Type pt() {
561 return resultInfo.pt;
562 }
564 int pkind() {
565 return resultInfo.pkind;
566 }
568 /* ************************************************************************
569 * Visitor methods
570 *************************************************************************/
572 /** Visitor argument: the current environment.
573 */
574 Env<AttrContext> env;
576 /** Visitor argument: the currently expected attribution result.
577 */
578 ResultInfo resultInfo;
580 /** Visitor result: the computed type.
581 */
582 Type result;
584 /** Visitor method: attribute a tree, catching any completion failure
585 * exceptions. Return the tree's type.
586 *
587 * @param tree The tree to be visited.
588 * @param env The environment visitor argument.
589 * @param resultInfo The result info visitor argument.
590 */
591 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
592 Env<AttrContext> prevEnv = this.env;
593 ResultInfo prevResult = this.resultInfo;
594 try {
595 this.env = env;
596 this.resultInfo = resultInfo;
597 tree.accept(this);
598 if (tree == breakTree &&
599 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
600 throw new BreakAttr(copyEnv(env));
601 }
602 return result;
603 } catch (CompletionFailure ex) {
604 tree.type = syms.errType;
605 return chk.completionError(tree.pos(), ex);
606 } finally {
607 this.env = prevEnv;
608 this.resultInfo = prevResult;
609 }
610 }
612 Env<AttrContext> copyEnv(Env<AttrContext> env) {
613 Env<AttrContext> newEnv =
614 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
615 if (newEnv.outer != null) {
616 newEnv.outer = copyEnv(newEnv.outer);
617 }
618 return newEnv;
619 }
621 Scope copyScope(Scope sc) {
622 Scope newScope = new Scope(sc.owner);
623 List<Symbol> elemsList = List.nil();
624 while (sc != null) {
625 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
626 elemsList = elemsList.prepend(e.sym);
627 }
628 sc = sc.next;
629 }
630 for (Symbol s : elemsList) {
631 newScope.enter(s);
632 }
633 return newScope;
634 }
636 /** Derived visitor method: attribute an expression tree.
637 */
638 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
639 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
640 }
642 /** Derived visitor method: attribute an expression tree with
643 * no constraints on the computed type.
644 */
645 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
646 return attribTree(tree, env, unknownExprInfo);
647 }
649 /** Derived visitor method: attribute a type tree.
650 */
651 public Type attribType(JCTree tree, Env<AttrContext> env) {
652 Type result = attribType(tree, env, Type.noType);
653 return result;
654 }
656 /** Derived visitor method: attribute a type tree.
657 */
658 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
659 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
660 return result;
661 }
663 /** Derived visitor method: attribute a statement or definition tree.
664 */
665 public Type attribStat(JCTree tree, Env<AttrContext> env) {
666 return attribTree(tree, env, statInfo);
667 }
669 /** Attribute a list of expressions, returning a list of types.
670 */
671 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
672 ListBuffer<Type> ts = new ListBuffer<Type>();
673 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
674 ts.append(attribExpr(l.head, env, pt));
675 return ts.toList();
676 }
678 /** Attribute a list of statements, returning nothing.
679 */
680 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
681 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
682 attribStat(l.head, env);
683 }
685 /** Attribute the arguments in a method call, returning the method kind.
686 */
687 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
688 int kind = VAL;
689 for (JCExpression arg : trees) {
690 Type argtype;
691 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
692 argtype = deferredAttr.new DeferredType(arg, env);
693 kind |= POLY;
694 } else {
695 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
696 }
697 argtypes.append(argtype);
698 }
699 return kind;
700 }
702 /** Attribute a type argument list, returning a list of types.
703 * Caller is responsible for calling checkRefTypes.
704 */
705 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
706 ListBuffer<Type> argtypes = new ListBuffer<Type>();
707 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
708 argtypes.append(attribType(l.head, env));
709 return argtypes.toList();
710 }
712 /** Attribute a type argument list, returning a list of types.
713 * Check that all the types are references.
714 */
715 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
716 List<Type> types = attribAnyTypes(trees, env);
717 return chk.checkRefTypes(trees, types);
718 }
720 /**
721 * Attribute type variables (of generic classes or methods).
722 * Compound types are attributed later in attribBounds.
723 * @param typarams the type variables to enter
724 * @param env the current environment
725 */
726 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
727 for (JCTypeParameter tvar : typarams) {
728 TypeVar a = (TypeVar)tvar.type;
729 a.tsym.flags_field |= UNATTRIBUTED;
730 a.bound = Type.noType;
731 if (!tvar.bounds.isEmpty()) {
732 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
733 for (JCExpression bound : tvar.bounds.tail)
734 bounds = bounds.prepend(attribType(bound, env));
735 types.setBounds(a, bounds.reverse());
736 } else {
737 // if no bounds are given, assume a single bound of
738 // java.lang.Object.
739 types.setBounds(a, List.of(syms.objectType));
740 }
741 a.tsym.flags_field &= ~UNATTRIBUTED;
742 }
743 for (JCTypeParameter tvar : typarams) {
744 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
745 }
746 }
748 /**
749 * Attribute the type references in a list of annotations.
750 */
751 void attribAnnotationTypes(List<JCAnnotation> annotations,
752 Env<AttrContext> env) {
753 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
754 JCAnnotation a = al.head;
755 attribType(a.annotationType, env);
756 }
757 }
759 /**
760 * Attribute a "lazy constant value".
761 * @param env The env for the const value
762 * @param initializer The initializer for the const value
763 * @param type The expected type, or null
764 * @see VarSymbol#setLazyConstValue
765 */
766 public Object attribLazyConstantValue(Env<AttrContext> env,
767 JCVariableDecl variable,
768 Type type) {
770 DiagnosticPosition prevLintPos
771 = deferredLintHandler.setPos(variable.pos());
773 try {
774 // Use null as symbol to not attach the type annotation to any symbol.
775 // The initializer will later also be visited and then we'll attach
776 // to the symbol.
777 // This prevents having multiple type annotations, just because of
778 // lazy constant value evaluation.
779 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
780 annotate.flush();
781 Type itype = attribExpr(variable.init, env, type);
782 if (itype.constValue() != null) {
783 return coerce(itype, type).constValue();
784 } else {
785 return null;
786 }
787 } finally {
788 deferredLintHandler.setPos(prevLintPos);
789 }
790 }
792 /** Attribute type reference in an `extends' or `implements' clause.
793 * Supertypes of anonymous inner classes are usually already attributed.
794 *
795 * @param tree The tree making up the type reference.
796 * @param env The environment current at the reference.
797 * @param classExpected true if only a class is expected here.
798 * @param interfaceExpected true if only an interface is expected here.
799 */
800 Type attribBase(JCTree tree,
801 Env<AttrContext> env,
802 boolean classExpected,
803 boolean interfaceExpected,
804 boolean checkExtensible) {
805 Type t = tree.type != null ?
806 tree.type :
807 attribType(tree, env);
808 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
809 }
810 Type checkBase(Type t,
811 JCTree tree,
812 Env<AttrContext> env,
813 boolean classExpected,
814 boolean interfaceExpected,
815 boolean checkExtensible) {
816 if (t.isErroneous())
817 return t;
818 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
819 // check that type variable is already visible
820 if (t.getUpperBound() == null) {
821 log.error(tree.pos(), "illegal.forward.ref");
822 return types.createErrorType(t);
823 }
824 } else {
825 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
826 }
827 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
828 log.error(tree.pos(), "intf.expected.here");
829 // return errType is necessary since otherwise there might
830 // be undetected cycles which cause attribution to loop
831 return types.createErrorType(t);
832 } else if (checkExtensible &&
833 classExpected &&
834 (t.tsym.flags() & INTERFACE) != 0) {
835 log.error(tree.pos(), "no.intf.expected.here");
836 return types.createErrorType(t);
837 }
838 if (checkExtensible &&
839 ((t.tsym.flags() & FINAL) != 0)) {
840 log.error(tree.pos(),
841 "cant.inherit.from.final", t.tsym);
842 }
843 chk.checkNonCyclic(tree.pos(), t);
844 return t;
845 }
847 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
848 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
849 id.type = env.info.scope.owner.type;
850 id.sym = env.info.scope.owner;
851 return id.type;
852 }
854 public void visitClassDef(JCClassDecl tree) {
855 // Local classes have not been entered yet, so we need to do it now:
856 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
857 enter.classEnter(tree, env);
859 ClassSymbol c = tree.sym;
860 if (c == null) {
861 // exit in case something drastic went wrong during enter.
862 result = null;
863 } else {
864 // make sure class has been completed:
865 c.complete();
867 // If this class appears as an anonymous class
868 // in a superclass constructor call where
869 // no explicit outer instance is given,
870 // disable implicit outer instance from being passed.
871 // (This would be an illegal access to "this before super").
872 if (env.info.isSelfCall &&
873 env.tree.hasTag(NEWCLASS) &&
874 ((JCNewClass) env.tree).encl == null)
875 {
876 c.flags_field |= NOOUTERTHIS;
877 }
878 attribClass(tree.pos(), c);
879 result = tree.type = c.type;
880 }
881 }
883 public void visitMethodDef(JCMethodDecl tree) {
884 MethodSymbol m = tree.sym;
885 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
887 Lint lint = env.info.lint.augment(m);
888 Lint prevLint = chk.setLint(lint);
889 MethodSymbol prevMethod = chk.setMethod(m);
890 try {
891 deferredLintHandler.flush(tree.pos());
892 chk.checkDeprecatedAnnotation(tree.pos(), m);
895 // Create a new environment with local scope
896 // for attributing the method.
897 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
898 localEnv.info.lint = lint;
900 attribStats(tree.typarams, localEnv);
902 // If we override any other methods, check that we do so properly.
903 // JLS ???
904 if (m.isStatic()) {
905 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
906 } else {
907 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
908 }
909 chk.checkOverride(tree, m);
911 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
912 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
913 }
915 // Enter all type parameters into the local method scope.
916 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
917 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
919 ClassSymbol owner = env.enclClass.sym;
920 if ((owner.flags() & ANNOTATION) != 0 &&
921 tree.params.nonEmpty())
922 log.error(tree.params.head.pos(),
923 "intf.annotation.members.cant.have.params");
925 // Attribute all value parameters.
926 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
927 attribStat(l.head, localEnv);
928 }
930 chk.checkVarargsMethodDecl(localEnv, tree);
932 // Check that type parameters are well-formed.
933 chk.validate(tree.typarams, localEnv);
935 // Check that result type is well-formed.
936 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
937 chk.validate(tree.restype, localEnv);
939 // Check that receiver type is well-formed.
940 if (tree.recvparam != null) {
941 // Use a new environment to check the receiver parameter.
942 // Otherwise I get "might not have been initialized" errors.
943 // Is there a better way?
944 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
945 attribType(tree.recvparam, newEnv);
946 chk.validate(tree.recvparam, newEnv);
947 }
949 // annotation method checks
950 if ((owner.flags() & ANNOTATION) != 0) {
951 // annotation method cannot have throws clause
952 if (tree.thrown.nonEmpty()) {
953 log.error(tree.thrown.head.pos(),
954 "throws.not.allowed.in.intf.annotation");
955 }
956 // annotation method cannot declare type-parameters
957 if (tree.typarams.nonEmpty()) {
958 log.error(tree.typarams.head.pos(),
959 "intf.annotation.members.cant.have.type.params");
960 }
961 // validate annotation method's return type (could be an annotation type)
962 chk.validateAnnotationType(tree.restype);
963 // ensure that annotation method does not clash with members of Object/Annotation
964 chk.validateAnnotationMethod(tree.pos(), m);
965 }
967 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
968 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
970 if (tree.body == null) {
971 // Empty bodies are only allowed for
972 // abstract, native, or interface methods, or for methods
973 // in a retrofit signature class.
974 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
975 !relax)
976 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
977 if (tree.defaultValue != null) {
978 if ((owner.flags() & ANNOTATION) == 0)
979 log.error(tree.pos(),
980 "default.allowed.in.intf.annotation.member");
981 }
982 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
983 if ((owner.flags() & INTERFACE) != 0) {
984 log.error(tree.body.pos(), "intf.meth.cant.have.body");
985 } else {
986 log.error(tree.pos(), "abstract.meth.cant.have.body");
987 }
988 } else if ((tree.mods.flags & NATIVE) != 0) {
989 log.error(tree.pos(), "native.meth.cant.have.body");
990 } else {
991 // Add an implicit super() call unless an explicit call to
992 // super(...) or this(...) is given
993 // or we are compiling class java.lang.Object.
994 if (tree.name == names.init && owner.type != syms.objectType) {
995 JCBlock body = tree.body;
996 if (body.stats.isEmpty() ||
997 !TreeInfo.isSelfCall(body.stats.head)) {
998 body.stats = body.stats.
999 prepend(memberEnter.SuperCall(make.at(body.pos),
1000 List.<Type>nil(),
1001 List.<JCVariableDecl>nil(),
1002 false));
1003 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1004 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1005 TreeInfo.isSuperCall(body.stats.head)) {
1006 // enum constructors are not allowed to call super
1007 // directly, so make sure there aren't any super calls
1008 // in enum constructors, except in the compiler
1009 // generated one.
1010 log.error(tree.body.stats.head.pos(),
1011 "call.to.super.not.allowed.in.enum.ctor",
1012 env.enclClass.sym);
1013 }
1014 }
1016 // Attribute all type annotations in the body
1017 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1018 annotate.flush();
1020 // Attribute method body.
1021 attribStat(tree.body, localEnv);
1022 }
1024 localEnv.info.scope.leave();
1025 result = tree.type = m.type;
1026 }
1027 finally {
1028 chk.setLint(prevLint);
1029 chk.setMethod(prevMethod);
1030 }
1031 }
1033 public void visitVarDef(JCVariableDecl tree) {
1034 // Local variables have not been entered yet, so we need to do it now:
1035 if (env.info.scope.owner.kind == MTH) {
1036 if (tree.sym != null) {
1037 // parameters have already been entered
1038 env.info.scope.enter(tree.sym);
1039 } else {
1040 memberEnter.memberEnter(tree, env);
1041 annotate.flush();
1042 }
1043 } else {
1044 if (tree.init != null) {
1045 // Field initializer expression need to be entered.
1046 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1047 annotate.flush();
1048 }
1049 }
1051 VarSymbol v = tree.sym;
1052 Lint lint = env.info.lint.augment(v);
1053 Lint prevLint = chk.setLint(lint);
1055 // Check that the variable's declared type is well-formed.
1056 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1057 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1058 (tree.sym.flags() & PARAMETER) != 0;
1059 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1061 try {
1062 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1063 deferredLintHandler.flush(tree.pos());
1064 chk.checkDeprecatedAnnotation(tree.pos(), v);
1066 if (tree.init != null) {
1067 if ((v.flags_field & FINAL) == 0 ||
1068 !memberEnter.needsLazyConstValue(tree.init)) {
1069 // Not a compile-time constant
1070 // Attribute initializer in a new environment
1071 // with the declared variable as owner.
1072 // Check that initializer conforms to variable's declared type.
1073 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1074 initEnv.info.lint = lint;
1075 // In order to catch self-references, we set the variable's
1076 // declaration position to maximal possible value, effectively
1077 // marking the variable as undefined.
1078 initEnv.info.enclVar = v;
1079 attribExpr(tree.init, initEnv, v.type);
1080 }
1081 }
1082 result = tree.type = v.type;
1083 }
1084 finally {
1085 chk.setLint(prevLint);
1086 }
1087 }
1089 public void visitSkip(JCSkip tree) {
1090 result = null;
1091 }
1093 public void visitBlock(JCBlock tree) {
1094 if (env.info.scope.owner.kind == TYP) {
1095 // Block is a static or instance initializer;
1096 // let the owner of the environment be a freshly
1097 // created BLOCK-method.
1098 Env<AttrContext> localEnv =
1099 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1100 localEnv.info.scope.owner =
1101 new MethodSymbol(tree.flags | BLOCK |
1102 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1103 env.info.scope.owner);
1104 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1106 // Attribute all type annotations in the block
1107 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1108 annotate.flush();
1110 {
1111 // Store init and clinit type annotations with the ClassSymbol
1112 // to allow output in Gen.normalizeDefs.
1113 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1114 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1115 if ((tree.flags & STATIC) != 0) {
1116 cs.appendClassInitTypeAttributes(tas);
1117 } else {
1118 cs.appendInitTypeAttributes(tas);
1119 }
1120 }
1122 attribStats(tree.stats, localEnv);
1123 } else {
1124 // Create a new local environment with a local scope.
1125 Env<AttrContext> localEnv =
1126 env.dup(tree, env.info.dup(env.info.scope.dup()));
1127 try {
1128 attribStats(tree.stats, localEnv);
1129 } finally {
1130 localEnv.info.scope.leave();
1131 }
1132 }
1133 result = null;
1134 }
1136 public void visitDoLoop(JCDoWhileLoop tree) {
1137 attribStat(tree.body, env.dup(tree));
1138 attribExpr(tree.cond, env, syms.booleanType);
1139 result = null;
1140 }
1142 public void visitWhileLoop(JCWhileLoop tree) {
1143 attribExpr(tree.cond, env, syms.booleanType);
1144 attribStat(tree.body, env.dup(tree));
1145 result = null;
1146 }
1148 public void visitForLoop(JCForLoop tree) {
1149 Env<AttrContext> loopEnv =
1150 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1151 try {
1152 attribStats(tree.init, loopEnv);
1153 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1154 loopEnv.tree = tree; // before, we were not in loop!
1155 attribStats(tree.step, loopEnv);
1156 attribStat(tree.body, loopEnv);
1157 result = null;
1158 }
1159 finally {
1160 loopEnv.info.scope.leave();
1161 }
1162 }
1164 public void visitForeachLoop(JCEnhancedForLoop tree) {
1165 Env<AttrContext> loopEnv =
1166 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1167 try {
1168 //the Formal Parameter of a for-each loop is not in the scope when
1169 //attributing the for-each expression; we mimick this by attributing
1170 //the for-each expression first (against original scope).
1171 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1172 attribStat(tree.var, loopEnv);
1173 chk.checkNonVoid(tree.pos(), exprType);
1174 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1175 if (elemtype == null) {
1176 // or perhaps expr implements Iterable<T>?
1177 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1178 if (base == null) {
1179 log.error(tree.expr.pos(),
1180 "foreach.not.applicable.to.type",
1181 exprType,
1182 diags.fragment("type.req.array.or.iterable"));
1183 elemtype = types.createErrorType(exprType);
1184 } else {
1185 List<Type> iterableParams = base.allparams();
1186 elemtype = iterableParams.isEmpty()
1187 ? syms.objectType
1188 : types.upperBound(iterableParams.head);
1189 }
1190 }
1191 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1192 loopEnv.tree = tree; // before, we were not in loop!
1193 attribStat(tree.body, loopEnv);
1194 result = null;
1195 }
1196 finally {
1197 loopEnv.info.scope.leave();
1198 }
1199 }
1201 public void visitLabelled(JCLabeledStatement tree) {
1202 // Check that label is not used in an enclosing statement
1203 Env<AttrContext> env1 = env;
1204 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1205 if (env1.tree.hasTag(LABELLED) &&
1206 ((JCLabeledStatement) env1.tree).label == tree.label) {
1207 log.error(tree.pos(), "label.already.in.use",
1208 tree.label);
1209 break;
1210 }
1211 env1 = env1.next;
1212 }
1214 attribStat(tree.body, env.dup(tree));
1215 result = null;
1216 }
1218 public void visitSwitch(JCSwitch tree) {
1219 Type seltype = attribExpr(tree.selector, env);
1221 Env<AttrContext> switchEnv =
1222 env.dup(tree, env.info.dup(env.info.scope.dup()));
1224 try {
1226 boolean enumSwitch =
1227 allowEnums &&
1228 (seltype.tsym.flags() & Flags.ENUM) != 0;
1229 boolean stringSwitch = false;
1230 if (types.isSameType(seltype, syms.stringType)) {
1231 if (allowStringsInSwitch) {
1232 stringSwitch = true;
1233 } else {
1234 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1235 }
1236 }
1237 if (!enumSwitch && !stringSwitch)
1238 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1240 // Attribute all cases and
1241 // check that there are no duplicate case labels or default clauses.
1242 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1243 boolean hasDefault = false; // Is there a default label?
1244 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1245 JCCase c = l.head;
1246 Env<AttrContext> caseEnv =
1247 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1248 try {
1249 if (c.pat != null) {
1250 if (enumSwitch) {
1251 Symbol sym = enumConstant(c.pat, seltype);
1252 if (sym == null) {
1253 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1254 } else if (!labels.add(sym)) {
1255 log.error(c.pos(), "duplicate.case.label");
1256 }
1257 } else {
1258 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1259 if (!pattype.hasTag(ERROR)) {
1260 if (pattype.constValue() == null) {
1261 log.error(c.pat.pos(),
1262 (stringSwitch ? "string.const.req" : "const.expr.req"));
1263 } else if (labels.contains(pattype.constValue())) {
1264 log.error(c.pos(), "duplicate.case.label");
1265 } else {
1266 labels.add(pattype.constValue());
1267 }
1268 }
1269 }
1270 } else if (hasDefault) {
1271 log.error(c.pos(), "duplicate.default.label");
1272 } else {
1273 hasDefault = true;
1274 }
1275 attribStats(c.stats, caseEnv);
1276 } finally {
1277 caseEnv.info.scope.leave();
1278 addVars(c.stats, switchEnv.info.scope);
1279 }
1280 }
1282 result = null;
1283 }
1284 finally {
1285 switchEnv.info.scope.leave();
1286 }
1287 }
1288 // where
1289 /** Add any variables defined in stats to the switch scope. */
1290 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1291 for (;stats.nonEmpty(); stats = stats.tail) {
1292 JCTree stat = stats.head;
1293 if (stat.hasTag(VARDEF))
1294 switchScope.enter(((JCVariableDecl) stat).sym);
1295 }
1296 }
1297 // where
1298 /** Return the selected enumeration constant symbol, or null. */
1299 private Symbol enumConstant(JCTree tree, Type enumType) {
1300 if (!tree.hasTag(IDENT)) {
1301 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1302 return syms.errSymbol;
1303 }
1304 JCIdent ident = (JCIdent)tree;
1305 Name name = ident.name;
1306 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1307 e.scope != null; e = e.next()) {
1308 if (e.sym.kind == VAR) {
1309 Symbol s = ident.sym = e.sym;
1310 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1311 ident.type = s.type;
1312 return ((s.flags_field & Flags.ENUM) == 0)
1313 ? null : s;
1314 }
1315 }
1316 return null;
1317 }
1319 public void visitSynchronized(JCSynchronized tree) {
1320 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1321 attribStat(tree.body, env);
1322 result = null;
1323 }
1325 public void visitTry(JCTry tree) {
1326 // Create a new local environment with a local
1327 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1328 try {
1329 boolean isTryWithResource = tree.resources.nonEmpty();
1330 // Create a nested environment for attributing the try block if needed
1331 Env<AttrContext> tryEnv = isTryWithResource ?
1332 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1333 localEnv;
1334 try {
1335 // Attribute resource declarations
1336 for (JCTree resource : tree.resources) {
1337 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1338 @Override
1339 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1340 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1341 }
1342 };
1343 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1344 if (resource.hasTag(VARDEF)) {
1345 attribStat(resource, tryEnv);
1346 twrResult.check(resource, resource.type);
1348 //check that resource type cannot throw InterruptedException
1349 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1351 VarSymbol var = ((JCVariableDecl) resource).sym;
1352 var.setData(ElementKind.RESOURCE_VARIABLE);
1353 } else {
1354 attribTree(resource, tryEnv, twrResult);
1355 }
1356 }
1357 // Attribute body
1358 attribStat(tree.body, tryEnv);
1359 } finally {
1360 if (isTryWithResource)
1361 tryEnv.info.scope.leave();
1362 }
1364 // Attribute catch clauses
1365 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1366 JCCatch c = l.head;
1367 Env<AttrContext> catchEnv =
1368 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1369 try {
1370 Type ctype = attribStat(c.param, catchEnv);
1371 if (TreeInfo.isMultiCatch(c)) {
1372 //multi-catch parameter is implicitly marked as final
1373 c.param.sym.flags_field |= FINAL | UNION;
1374 }
1375 if (c.param.sym.kind == Kinds.VAR) {
1376 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1377 }
1378 chk.checkType(c.param.vartype.pos(),
1379 chk.checkClassType(c.param.vartype.pos(), ctype),
1380 syms.throwableType);
1381 attribStat(c.body, catchEnv);
1382 } finally {
1383 catchEnv.info.scope.leave();
1384 }
1385 }
1387 // Attribute finalizer
1388 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1389 result = null;
1390 }
1391 finally {
1392 localEnv.info.scope.leave();
1393 }
1394 }
1396 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1397 if (!resource.isErroneous() &&
1398 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1399 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1400 Symbol close = syms.noSymbol;
1401 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1402 try {
1403 close = rs.resolveQualifiedMethod(pos,
1404 env,
1405 resource,
1406 names.close,
1407 List.<Type>nil(),
1408 List.<Type>nil());
1409 }
1410 finally {
1411 log.popDiagnosticHandler(discardHandler);
1412 }
1413 if (close.kind == MTH &&
1414 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1415 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1416 env.info.lint.isEnabled(LintCategory.TRY)) {
1417 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1418 }
1419 }
1420 }
1422 public void visitConditional(JCConditional tree) {
1423 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1425 tree.polyKind = (!allowPoly ||
1426 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1427 isBooleanOrNumeric(env, tree)) ?
1428 PolyKind.STANDALONE : PolyKind.POLY;
1430 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1431 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1432 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1433 result = tree.type = types.createErrorType(resultInfo.pt);
1434 return;
1435 }
1437 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1438 unknownExprInfo :
1439 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1440 //this will use enclosing check context to check compatibility of
1441 //subexpression against target type; if we are in a method check context,
1442 //depending on whether boxing is allowed, we could have incompatibilities
1443 @Override
1444 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1445 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1446 }
1447 });
1449 Type truetype = attribTree(tree.truepart, env, condInfo);
1450 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1452 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1453 if (condtype.constValue() != null &&
1454 truetype.constValue() != null &&
1455 falsetype.constValue() != null &&
1456 !owntype.hasTag(NONE)) {
1457 //constant folding
1458 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1459 }
1460 result = check(tree, owntype, VAL, resultInfo);
1461 }
1462 //where
1463 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1464 switch (tree.getTag()) {
1465 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1466 ((JCLiteral)tree).typetag == BOOLEAN ||
1467 ((JCLiteral)tree).typetag == BOT;
1468 case LAMBDA: case REFERENCE: return false;
1469 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1470 case CONDEXPR:
1471 JCConditional condTree = (JCConditional)tree;
1472 return isBooleanOrNumeric(env, condTree.truepart) &&
1473 isBooleanOrNumeric(env, condTree.falsepart);
1474 case APPLY:
1475 JCMethodInvocation speculativeMethodTree =
1476 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1477 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1478 return types.unboxedTypeOrType(owntype).isPrimitive();
1479 case NEWCLASS:
1480 JCExpression className =
1481 removeClassParams.translate(((JCNewClass)tree).clazz);
1482 JCExpression speculativeNewClassTree =
1483 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1484 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1485 default:
1486 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1487 speculativeType = types.unboxedTypeOrType(speculativeType);
1488 return speculativeType.isPrimitive();
1489 }
1490 }
1491 //where
1492 TreeTranslator removeClassParams = new TreeTranslator() {
1493 @Override
1494 public void visitTypeApply(JCTypeApply tree) {
1495 result = translate(tree.clazz);
1496 }
1497 };
1499 /** Compute the type of a conditional expression, after
1500 * checking that it exists. See JLS 15.25. Does not take into
1501 * account the special case where condition and both arms
1502 * are constants.
1503 *
1504 * @param pos The source position to be used for error
1505 * diagnostics.
1506 * @param thentype The type of the expression's then-part.
1507 * @param elsetype The type of the expression's else-part.
1508 */
1509 private Type condType(DiagnosticPosition pos,
1510 Type thentype, Type elsetype) {
1511 // If same type, that is the result
1512 if (types.isSameType(thentype, elsetype))
1513 return thentype.baseType();
1515 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1516 ? thentype : types.unboxedType(thentype);
1517 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1518 ? elsetype : types.unboxedType(elsetype);
1520 // Otherwise, if both arms can be converted to a numeric
1521 // type, return the least numeric type that fits both arms
1522 // (i.e. return larger of the two, or return int if one
1523 // arm is short, the other is char).
1524 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1525 // If one arm has an integer subrange type (i.e., byte,
1526 // short, or char), and the other is an integer constant
1527 // that fits into the subrange, return the subrange type.
1528 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1529 elseUnboxed.hasTag(INT) &&
1530 types.isAssignable(elseUnboxed, thenUnboxed)) {
1531 return thenUnboxed.baseType();
1532 }
1533 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1534 thenUnboxed.hasTag(INT) &&
1535 types.isAssignable(thenUnboxed, elseUnboxed)) {
1536 return elseUnboxed.baseType();
1537 }
1539 for (TypeTag tag : primitiveTags) {
1540 Type candidate = syms.typeOfTag[tag.ordinal()];
1541 if (types.isSubtype(thenUnboxed, candidate) &&
1542 types.isSubtype(elseUnboxed, candidate)) {
1543 return candidate;
1544 }
1545 }
1546 }
1548 // Those were all the cases that could result in a primitive
1549 if (allowBoxing) {
1550 if (thentype.isPrimitive())
1551 thentype = types.boxedClass(thentype).type;
1552 if (elsetype.isPrimitive())
1553 elsetype = types.boxedClass(elsetype).type;
1554 }
1556 if (types.isSubtype(thentype, elsetype))
1557 return elsetype.baseType();
1558 if (types.isSubtype(elsetype, thentype))
1559 return thentype.baseType();
1561 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1562 log.error(pos, "neither.conditional.subtype",
1563 thentype, elsetype);
1564 return thentype.baseType();
1565 }
1567 // both are known to be reference types. The result is
1568 // lub(thentype,elsetype). This cannot fail, as it will
1569 // always be possible to infer "Object" if nothing better.
1570 return types.lub(thentype.baseType(), elsetype.baseType());
1571 }
1573 final static TypeTag[] primitiveTags = new TypeTag[]{
1574 BYTE,
1575 CHAR,
1576 SHORT,
1577 INT,
1578 LONG,
1579 FLOAT,
1580 DOUBLE,
1581 BOOLEAN,
1582 };
1584 public void visitIf(JCIf tree) {
1585 attribExpr(tree.cond, env, syms.booleanType);
1586 attribStat(tree.thenpart, env);
1587 if (tree.elsepart != null)
1588 attribStat(tree.elsepart, env);
1589 chk.checkEmptyIf(tree);
1590 result = null;
1591 }
1593 public void visitExec(JCExpressionStatement tree) {
1594 //a fresh environment is required for 292 inference to work properly ---
1595 //see Infer.instantiatePolymorphicSignatureInstance()
1596 Env<AttrContext> localEnv = env.dup(tree);
1597 attribExpr(tree.expr, localEnv);
1598 result = null;
1599 }
1601 public void visitBreak(JCBreak tree) {
1602 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1603 result = null;
1604 }
1606 public void visitContinue(JCContinue tree) {
1607 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1608 result = null;
1609 }
1610 //where
1611 /** Return the target of a break or continue statement, if it exists,
1612 * report an error if not.
1613 * Note: The target of a labelled break or continue is the
1614 * (non-labelled) statement tree referred to by the label,
1615 * not the tree representing the labelled statement itself.
1616 *
1617 * @param pos The position to be used for error diagnostics
1618 * @param tag The tag of the jump statement. This is either
1619 * Tree.BREAK or Tree.CONTINUE.
1620 * @param label The label of the jump statement, or null if no
1621 * label is given.
1622 * @param env The environment current at the jump statement.
1623 */
1624 private JCTree findJumpTarget(DiagnosticPosition pos,
1625 JCTree.Tag tag,
1626 Name label,
1627 Env<AttrContext> env) {
1628 // Search environments outwards from the point of jump.
1629 Env<AttrContext> env1 = env;
1630 LOOP:
1631 while (env1 != null) {
1632 switch (env1.tree.getTag()) {
1633 case LABELLED:
1634 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1635 if (label == labelled.label) {
1636 // If jump is a continue, check that target is a loop.
1637 if (tag == CONTINUE) {
1638 if (!labelled.body.hasTag(DOLOOP) &&
1639 !labelled.body.hasTag(WHILELOOP) &&
1640 !labelled.body.hasTag(FORLOOP) &&
1641 !labelled.body.hasTag(FOREACHLOOP))
1642 log.error(pos, "not.loop.label", label);
1643 // Found labelled statement target, now go inwards
1644 // to next non-labelled tree.
1645 return TreeInfo.referencedStatement(labelled);
1646 } else {
1647 return labelled;
1648 }
1649 }
1650 break;
1651 case DOLOOP:
1652 case WHILELOOP:
1653 case FORLOOP:
1654 case FOREACHLOOP:
1655 if (label == null) return env1.tree;
1656 break;
1657 case SWITCH:
1658 if (label == null && tag == BREAK) return env1.tree;
1659 break;
1660 case LAMBDA:
1661 case METHODDEF:
1662 case CLASSDEF:
1663 break LOOP;
1664 default:
1665 }
1666 env1 = env1.next;
1667 }
1668 if (label != null)
1669 log.error(pos, "undef.label", label);
1670 else if (tag == CONTINUE)
1671 log.error(pos, "cont.outside.loop");
1672 else
1673 log.error(pos, "break.outside.switch.loop");
1674 return null;
1675 }
1677 public void visitReturn(JCReturn tree) {
1678 // Check that there is an enclosing method which is
1679 // nested within than the enclosing class.
1680 if (env.info.returnResult == null) {
1681 log.error(tree.pos(), "ret.outside.meth");
1682 } else {
1683 // Attribute return expression, if it exists, and check that
1684 // it conforms to result type of enclosing method.
1685 if (tree.expr != null) {
1686 if (env.info.returnResult.pt.hasTag(VOID)) {
1687 env.info.returnResult.checkContext.report(tree.expr.pos(),
1688 diags.fragment("unexpected.ret.val"));
1689 }
1690 attribTree(tree.expr, env, env.info.returnResult);
1691 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1692 !env.info.returnResult.pt.hasTag(NONE)) {
1693 env.info.returnResult.checkContext.report(tree.pos(),
1694 diags.fragment("missing.ret.val"));
1695 }
1696 }
1697 result = null;
1698 }
1700 public void visitThrow(JCThrow tree) {
1701 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1702 if (allowPoly) {
1703 chk.checkType(tree, owntype, syms.throwableType);
1704 }
1705 result = null;
1706 }
1708 public void visitAssert(JCAssert tree) {
1709 attribExpr(tree.cond, env, syms.booleanType);
1710 if (tree.detail != null) {
1711 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1712 }
1713 result = null;
1714 }
1716 /** Visitor method for method invocations.
1717 * NOTE: The method part of an application will have in its type field
1718 * the return type of the method, not the method's type itself!
1719 */
1720 public void visitApply(JCMethodInvocation tree) {
1721 // The local environment of a method application is
1722 // a new environment nested in the current one.
1723 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1725 // The types of the actual method arguments.
1726 List<Type> argtypes;
1728 // The types of the actual method type arguments.
1729 List<Type> typeargtypes = null;
1731 Name methName = TreeInfo.name(tree.meth);
1733 boolean isConstructorCall =
1734 methName == names._this || methName == names._super;
1736 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1737 if (isConstructorCall) {
1738 // We are seeing a ...this(...) or ...super(...) call.
1739 // Check that this is the first statement in a constructor.
1740 if (checkFirstConstructorStat(tree, env)) {
1742 // Record the fact
1743 // that this is a constructor call (using isSelfCall).
1744 localEnv.info.isSelfCall = true;
1746 // Attribute arguments, yielding list of argument types.
1747 attribArgs(tree.args, localEnv, argtypesBuf);
1748 argtypes = argtypesBuf.toList();
1749 typeargtypes = attribTypes(tree.typeargs, localEnv);
1751 // Variable `site' points to the class in which the called
1752 // constructor is defined.
1753 Type site = env.enclClass.sym.type;
1754 if (methName == names._super) {
1755 if (site == syms.objectType) {
1756 log.error(tree.meth.pos(), "no.superclass", site);
1757 site = types.createErrorType(syms.objectType);
1758 } else {
1759 site = types.supertype(site);
1760 }
1761 }
1763 if (site.hasTag(CLASS)) {
1764 Type encl = site.getEnclosingType();
1765 while (encl != null && encl.hasTag(TYPEVAR))
1766 encl = encl.getUpperBound();
1767 if (encl.hasTag(CLASS)) {
1768 // we are calling a nested class
1770 if (tree.meth.hasTag(SELECT)) {
1771 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1773 // We are seeing a prefixed call, of the form
1774 // <expr>.super(...).
1775 // Check that the prefix expression conforms
1776 // to the outer instance type of the class.
1777 chk.checkRefType(qualifier.pos(),
1778 attribExpr(qualifier, localEnv,
1779 encl));
1780 } else if (methName == names._super) {
1781 // qualifier omitted; check for existence
1782 // of an appropriate implicit qualifier.
1783 rs.resolveImplicitThis(tree.meth.pos(),
1784 localEnv, site, true);
1785 }
1786 } else if (tree.meth.hasTag(SELECT)) {
1787 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1788 site.tsym);
1789 }
1791 // if we're calling a java.lang.Enum constructor,
1792 // prefix the implicit String and int parameters
1793 if (site.tsym == syms.enumSym && allowEnums)
1794 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1796 // Resolve the called constructor under the assumption
1797 // that we are referring to a superclass instance of the
1798 // current instance (JLS ???).
1799 boolean selectSuperPrev = localEnv.info.selectSuper;
1800 localEnv.info.selectSuper = true;
1801 localEnv.info.pendingResolutionPhase = null;
1802 Symbol sym = rs.resolveConstructor(
1803 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1804 localEnv.info.selectSuper = selectSuperPrev;
1806 // Set method symbol to resolved constructor...
1807 TreeInfo.setSymbol(tree.meth, sym);
1809 // ...and check that it is legal in the current context.
1810 // (this will also set the tree's type)
1811 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1812 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1813 }
1814 // Otherwise, `site' is an error type and we do nothing
1815 }
1816 result = tree.type = syms.voidType;
1817 } else {
1818 // Otherwise, we are seeing a regular method call.
1819 // Attribute the arguments, yielding list of argument types, ...
1820 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1821 argtypes = argtypesBuf.toList();
1822 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1824 // ... and attribute the method using as a prototype a methodtype
1825 // whose formal argument types is exactly the list of actual
1826 // arguments (this will also set the method symbol).
1827 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1828 localEnv.info.pendingResolutionPhase = null;
1829 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1831 // Compute the result type.
1832 Type restype = mtype.getReturnType();
1833 if (restype.hasTag(WILDCARD))
1834 throw new AssertionError(mtype);
1836 Type qualifier = (tree.meth.hasTag(SELECT))
1837 ? ((JCFieldAccess) tree.meth).selected.type
1838 : env.enclClass.sym.type;
1839 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1841 chk.checkRefTypes(tree.typeargs, typeargtypes);
1843 // Check that value of resulting type is admissible in the
1844 // current context. Also, capture the return type
1845 result = check(tree, capture(restype), VAL, resultInfo);
1846 }
1847 chk.validate(tree.typeargs, localEnv);
1848 }
1849 //where
1850 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1851 if (allowCovariantReturns &&
1852 methodName == names.clone &&
1853 types.isArray(qualifierType)) {
1854 // as a special case, array.clone() has a result that is
1855 // the same as static type of the array being cloned
1856 return qualifierType;
1857 } else if (allowGenerics &&
1858 methodName == names.getClass &&
1859 argtypes.isEmpty()) {
1860 // as a special case, x.getClass() has type Class<? extends |X|>
1861 return new ClassType(restype.getEnclosingType(),
1862 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1863 BoundKind.EXTENDS,
1864 syms.boundClass)),
1865 restype.tsym);
1866 } else {
1867 return restype;
1868 }
1869 }
1871 /** Check that given application node appears as first statement
1872 * in a constructor call.
1873 * @param tree The application node
1874 * @param env The environment current at the application.
1875 */
1876 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1877 JCMethodDecl enclMethod = env.enclMethod;
1878 if (enclMethod != null && enclMethod.name == names.init) {
1879 JCBlock body = enclMethod.body;
1880 if (body.stats.head.hasTag(EXEC) &&
1881 ((JCExpressionStatement) body.stats.head).expr == tree)
1882 return true;
1883 }
1884 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1885 TreeInfo.name(tree.meth));
1886 return false;
1887 }
1889 /** Obtain a method type with given argument types.
1890 */
1891 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1892 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1893 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1894 }
1896 public void visitNewClass(final JCNewClass tree) {
1897 Type owntype = types.createErrorType(tree.type);
1899 // The local environment of a class creation is
1900 // a new environment nested in the current one.
1901 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1903 // The anonymous inner class definition of the new expression,
1904 // if one is defined by it.
1905 JCClassDecl cdef = tree.def;
1907 // If enclosing class is given, attribute it, and
1908 // complete class name to be fully qualified
1909 JCExpression clazz = tree.clazz; // Class field following new
1910 JCExpression clazzid; // Identifier in class field
1911 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1912 annoclazzid = null;
1914 if (clazz.hasTag(TYPEAPPLY)) {
1915 clazzid = ((JCTypeApply) clazz).clazz;
1916 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1917 annoclazzid = (JCAnnotatedType) clazzid;
1918 clazzid = annoclazzid.underlyingType;
1919 }
1920 } else {
1921 if (clazz.hasTag(ANNOTATED_TYPE)) {
1922 annoclazzid = (JCAnnotatedType) clazz;
1923 clazzid = annoclazzid.underlyingType;
1924 } else {
1925 clazzid = clazz;
1926 }
1927 }
1929 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1931 if (tree.encl != null) {
1932 // We are seeing a qualified new, of the form
1933 // <expr>.new C <...> (...) ...
1934 // In this case, we let clazz stand for the name of the
1935 // allocated class C prefixed with the type of the qualifier
1936 // expression, so that we can
1937 // resolve it with standard techniques later. I.e., if
1938 // <expr> has type T, then <expr>.new C <...> (...)
1939 // yields a clazz T.C.
1940 Type encltype = chk.checkRefType(tree.encl.pos(),
1941 attribExpr(tree.encl, env));
1942 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1943 // from expr to the combined type, or not? Yes, do this.
1944 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1945 ((JCIdent) clazzid).name);
1947 EndPosTable endPosTable = this.env.toplevel.endPositions;
1948 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1949 if (clazz.hasTag(ANNOTATED_TYPE)) {
1950 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1951 List<JCAnnotation> annos = annoType.annotations;
1953 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1954 clazzid1 = make.at(tree.pos).
1955 TypeApply(clazzid1,
1956 ((JCTypeApply) clazz).arguments);
1957 }
1959 clazzid1 = make.at(tree.pos).
1960 AnnotatedType(annos, clazzid1);
1961 } else if (clazz.hasTag(TYPEAPPLY)) {
1962 clazzid1 = make.at(tree.pos).
1963 TypeApply(clazzid1,
1964 ((JCTypeApply) clazz).arguments);
1965 }
1967 clazz = clazzid1;
1968 }
1970 // Attribute clazz expression and store
1971 // symbol + type back into the attributed tree.
1972 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1973 attribIdentAsEnumType(env, (JCIdent)clazz) :
1974 attribType(clazz, env);
1976 clazztype = chk.checkDiamond(tree, clazztype);
1977 chk.validate(clazz, localEnv);
1978 if (tree.encl != null) {
1979 // We have to work in this case to store
1980 // symbol + type back into the attributed tree.
1981 tree.clazz.type = clazztype;
1982 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1983 clazzid.type = ((JCIdent) clazzid).sym.type;
1984 if (annoclazzid != null) {
1985 annoclazzid.type = clazzid.type;
1986 }
1987 if (!clazztype.isErroneous()) {
1988 if (cdef != null && clazztype.tsym.isInterface()) {
1989 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1990 } else if (clazztype.tsym.isStatic()) {
1991 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1992 }
1993 }
1994 } else if (!clazztype.tsym.isInterface() &&
1995 clazztype.getEnclosingType().hasTag(CLASS)) {
1996 // Check for the existence of an apropos outer instance
1997 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1998 }
2000 // Attribute constructor arguments.
2001 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
2002 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
2003 List<Type> argtypes = argtypesBuf.toList();
2004 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
2006 // If we have made no mistakes in the class type...
2007 if (clazztype.hasTag(CLASS)) {
2008 // Enums may not be instantiated except implicitly
2009 if (allowEnums &&
2010 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
2011 (!env.tree.hasTag(VARDEF) ||
2012 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2013 ((JCVariableDecl) env.tree).init != tree))
2014 log.error(tree.pos(), "enum.cant.be.instantiated");
2015 // Check that class is not abstract
2016 if (cdef == null &&
2017 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2018 log.error(tree.pos(), "abstract.cant.be.instantiated",
2019 clazztype.tsym);
2020 } else if (cdef != null && clazztype.tsym.isInterface()) {
2021 // Check that no constructor arguments are given to
2022 // anonymous classes implementing an interface
2023 if (!argtypes.isEmpty())
2024 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2026 if (!typeargtypes.isEmpty())
2027 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2029 // Error recovery: pretend no arguments were supplied.
2030 argtypes = List.nil();
2031 typeargtypes = List.nil();
2032 } else if (TreeInfo.isDiamond(tree)) {
2033 ClassType site = new ClassType(clazztype.getEnclosingType(),
2034 clazztype.tsym.type.getTypeArguments(),
2035 clazztype.tsym);
2037 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2038 diamondEnv.info.selectSuper = cdef != null;
2039 diamondEnv.info.pendingResolutionPhase = null;
2041 //if the type of the instance creation expression is a class type
2042 //apply method resolution inference (JLS 15.12.2.7). The return type
2043 //of the resolved constructor will be a partially instantiated type
2044 Symbol constructor = rs.resolveDiamond(tree.pos(),
2045 diamondEnv,
2046 site,
2047 argtypes,
2048 typeargtypes);
2049 tree.constructor = constructor.baseSymbol();
2051 final TypeSymbol csym = clazztype.tsym;
2052 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2053 @Override
2054 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2055 enclosingContext.report(tree.clazz,
2056 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2057 }
2058 });
2059 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2060 constructorType = checkId(tree, site,
2061 constructor,
2062 diamondEnv,
2063 diamondResult);
2065 tree.clazz.type = types.createErrorType(clazztype);
2066 if (!constructorType.isErroneous()) {
2067 tree.clazz.type = clazztype = constructorType.getReturnType();
2068 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2069 }
2070 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2071 }
2073 // Resolve the called constructor under the assumption
2074 // that we are referring to a superclass instance of the
2075 // current instance (JLS ???).
2076 else {
2077 //the following code alters some of the fields in the current
2078 //AttrContext - hence, the current context must be dup'ed in
2079 //order to avoid downstream failures
2080 Env<AttrContext> rsEnv = localEnv.dup(tree);
2081 rsEnv.info.selectSuper = cdef != null;
2082 rsEnv.info.pendingResolutionPhase = null;
2083 tree.constructor = rs.resolveConstructor(
2084 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2085 if (cdef == null) { //do not check twice!
2086 tree.constructorType = checkId(tree,
2087 clazztype,
2088 tree.constructor,
2089 rsEnv,
2090 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2091 if (rsEnv.info.lastResolveVarargs())
2092 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2093 }
2094 if (cdef == null &&
2095 !clazztype.isErroneous() &&
2096 clazztype.getTypeArguments().nonEmpty() &&
2097 findDiamonds) {
2098 findDiamond(localEnv, tree, clazztype);
2099 }
2100 }
2102 if (cdef != null) {
2103 // We are seeing an anonymous class instance creation.
2104 // In this case, the class instance creation
2105 // expression
2106 //
2107 // E.new <typeargs1>C<typargs2>(args) { ... }
2108 //
2109 // is represented internally as
2110 //
2111 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2112 //
2113 // This expression is then *transformed* as follows:
2114 //
2115 // (1) add a STATIC flag to the class definition
2116 // if the current environment is static
2117 // (2) add an extends or implements clause
2118 // (3) add a constructor.
2119 //
2120 // For instance, if C is a class, and ET is the type of E,
2121 // the expression
2122 //
2123 // E.new <typeargs1>C<typargs2>(args) { ... }
2124 //
2125 // is translated to (where X is a fresh name and typarams is the
2126 // parameter list of the super constructor):
2127 //
2128 // new <typeargs1>X(<*nullchk*>E, args) where
2129 // X extends C<typargs2> {
2130 // <typarams> X(ET e, args) {
2131 // e.<typeargs1>super(args)
2132 // }
2133 // ...
2134 // }
2135 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2137 if (clazztype.tsym.isInterface()) {
2138 cdef.implementing = List.of(clazz);
2139 } else {
2140 cdef.extending = clazz;
2141 }
2143 attribStat(cdef, localEnv);
2145 checkLambdaCandidate(tree, cdef.sym, clazztype);
2147 // If an outer instance is given,
2148 // prefix it to the constructor arguments
2149 // and delete it from the new expression
2150 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2151 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2152 argtypes = argtypes.prepend(tree.encl.type);
2153 tree.encl = null;
2154 }
2156 // Reassign clazztype and recompute constructor.
2157 clazztype = cdef.sym.type;
2158 Symbol sym = tree.constructor = rs.resolveConstructor(
2159 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2160 Assert.check(sym.kind < AMBIGUOUS);
2161 tree.constructor = sym;
2162 tree.constructorType = checkId(tree,
2163 clazztype,
2164 tree.constructor,
2165 localEnv,
2166 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2167 } else {
2168 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2169 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2170 tree.clazz.type.tsym);
2171 }
2172 }
2174 if (tree.constructor != null && tree.constructor.kind == MTH)
2175 owntype = clazztype;
2176 }
2177 result = check(tree, owntype, VAL, resultInfo);
2178 chk.validate(tree.typeargs, localEnv);
2179 }
2180 //where
2181 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2182 JCTypeApply ta = (JCTypeApply)tree.clazz;
2183 List<JCExpression> prevTypeargs = ta.arguments;
2184 try {
2185 //create a 'fake' diamond AST node by removing type-argument trees
2186 ta.arguments = List.nil();
2187 ResultInfo findDiamondResult = new ResultInfo(VAL,
2188 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2189 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2190 Type polyPt = allowPoly ?
2191 syms.objectType :
2192 clazztype;
2193 if (!inferred.isErroneous() &&
2194 (allowPoly && pt() == Infer.anyPoly ?
2195 types.isSameType(inferred, clazztype) :
2196 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2197 String key = types.isSameType(clazztype, inferred) ?
2198 "diamond.redundant.args" :
2199 "diamond.redundant.args.1";
2200 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2201 }
2202 } finally {
2203 ta.arguments = prevTypeargs;
2204 }
2205 }
2207 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2208 if (allowLambda &&
2209 identifyLambdaCandidate &&
2210 clazztype.hasTag(CLASS) &&
2211 !pt().hasTag(NONE) &&
2212 types.isFunctionalInterface(clazztype.tsym)) {
2213 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2214 int count = 0;
2215 boolean found = false;
2216 for (Symbol sym : csym.members().getElements()) {
2217 if ((sym.flags() & SYNTHETIC) != 0 ||
2218 sym.isConstructor()) continue;
2219 count++;
2220 if (sym.kind != MTH ||
2221 !sym.name.equals(descriptor.name)) continue;
2222 Type mtype = types.memberType(clazztype, sym);
2223 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2224 found = true;
2225 }
2226 }
2227 if (found && count == 1) {
2228 log.note(tree.def, "potential.lambda.found");
2229 }
2230 }
2231 }
2233 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2234 Symbol sym) {
2235 // Ensure that no declaration annotations are present.
2236 // Note that a tree type might be an AnnotatedType with
2237 // empty annotations, if only declaration annotations were given.
2238 // This method will raise an error for such a type.
2239 for (JCAnnotation ai : annotations) {
2240 if (!ai.type.isErroneous() &&
2241 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2242 log.error(ai.pos(), "annotation.type.not.applicable");
2243 }
2244 }
2245 }
2248 /** Make an attributed null check tree.
2249 */
2250 public JCExpression makeNullCheck(JCExpression arg) {
2251 // optimization: X.this is never null; skip null check
2252 Name name = TreeInfo.name(arg);
2253 if (name == names._this || name == names._super) return arg;
2255 JCTree.Tag optag = NULLCHK;
2256 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2257 tree.operator = syms.nullcheck;
2258 tree.type = arg.type;
2259 return tree;
2260 }
2262 public void visitNewArray(JCNewArray tree) {
2263 Type owntype = types.createErrorType(tree.type);
2264 Env<AttrContext> localEnv = env.dup(tree);
2265 Type elemtype;
2266 if (tree.elemtype != null) {
2267 elemtype = attribType(tree.elemtype, localEnv);
2268 chk.validate(tree.elemtype, localEnv);
2269 owntype = elemtype;
2270 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2271 attribExpr(l.head, localEnv, syms.intType);
2272 owntype = new ArrayType(owntype, syms.arrayClass);
2273 }
2274 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2275 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2276 tree.elemtype.type.tsym);
2277 }
2278 } else {
2279 // we are seeing an untyped aggregate { ... }
2280 // this is allowed only if the prototype is an array
2281 if (pt().hasTag(ARRAY)) {
2282 elemtype = types.elemtype(pt());
2283 } else {
2284 if (!pt().hasTag(ERROR)) {
2285 log.error(tree.pos(), "illegal.initializer.for.type",
2286 pt());
2287 }
2288 elemtype = types.createErrorType(pt());
2289 }
2290 }
2291 if (tree.elems != null) {
2292 attribExprs(tree.elems, localEnv, elemtype);
2293 owntype = new ArrayType(elemtype, syms.arrayClass);
2294 }
2295 if (!types.isReifiable(elemtype))
2296 log.error(tree.pos(), "generic.array.creation");
2297 result = check(tree, owntype, VAL, resultInfo);
2298 }
2300 /*
2301 * A lambda expression can only be attributed when a target-type is available.
2302 * In addition, if the target-type is that of a functional interface whose
2303 * descriptor contains inference variables in argument position the lambda expression
2304 * is 'stuck' (see DeferredAttr).
2305 */
2306 @Override
2307 public void visitLambda(final JCLambda that) {
2308 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2309 if (pt().hasTag(NONE)) {
2310 //lambda only allowed in assignment or method invocation/cast context
2311 log.error(that.pos(), "unexpected.lambda");
2312 }
2313 result = that.type = types.createErrorType(pt());
2314 return;
2315 }
2316 //create an environment for attribution of the lambda expression
2317 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2318 boolean needsRecovery =
2319 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2320 try {
2321 Type currentTarget = pt();
2322 List<Type> explicitParamTypes = null;
2323 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2324 //attribute lambda parameters
2325 attribStats(that.params, localEnv);
2326 explicitParamTypes = TreeInfo.types(that.params);
2327 }
2329 Type lambdaType;
2330 if (pt() != Type.recoveryType) {
2331 /* We need to adjust the target. If the target is an
2332 * intersection type, for example: SAM & I1 & I2 ...
2333 * the target will be updated to SAM
2334 */
2335 currentTarget = targetChecker.visit(currentTarget, that);
2336 if (explicitParamTypes != null) {
2337 currentTarget = infer.instantiateFunctionalInterface(that,
2338 currentTarget, explicitParamTypes, resultInfo.checkContext);
2339 }
2340 lambdaType = types.findDescriptorType(currentTarget);
2341 } else {
2342 currentTarget = Type.recoveryType;
2343 lambdaType = fallbackDescriptorType(that);
2344 }
2346 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2348 if (lambdaType.hasTag(FORALL)) {
2349 //lambda expression target desc cannot be a generic method
2350 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2351 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2352 result = that.type = types.createErrorType(pt());
2353 return;
2354 }
2356 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2357 //add param type info in the AST
2358 List<Type> actuals = lambdaType.getParameterTypes();
2359 List<JCVariableDecl> params = that.params;
2361 boolean arityMismatch = false;
2363 while (params.nonEmpty()) {
2364 if (actuals.isEmpty()) {
2365 //not enough actuals to perform lambda parameter inference
2366 arityMismatch = true;
2367 }
2368 //reset previously set info
2369 Type argType = arityMismatch ?
2370 syms.errType :
2371 actuals.head;
2372 params.head.vartype = make.at(params.head).Type(argType);
2373 params.head.sym = null;
2374 actuals = actuals.isEmpty() ?
2375 actuals :
2376 actuals.tail;
2377 params = params.tail;
2378 }
2380 //attribute lambda parameters
2381 attribStats(that.params, localEnv);
2383 if (arityMismatch) {
2384 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2385 result = that.type = types.createErrorType(currentTarget);
2386 return;
2387 }
2388 }
2390 //from this point on, no recovery is needed; if we are in assignment context
2391 //we will be able to attribute the whole lambda body, regardless of errors;
2392 //if we are in a 'check' method context, and the lambda is not compatible
2393 //with the target-type, it will be recovered anyway in Attr.checkId
2394 needsRecovery = false;
2396 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2397 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2398 new FunctionalReturnContext(resultInfo.checkContext);
2400 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2401 recoveryInfo :
2402 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2403 localEnv.info.returnResult = bodyResultInfo;
2405 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2406 attribTree(that.getBody(), localEnv, bodyResultInfo);
2407 } else {
2408 JCBlock body = (JCBlock)that.body;
2409 attribStats(body.stats, localEnv);
2410 }
2412 result = check(that, currentTarget, VAL, resultInfo);
2414 boolean isSpeculativeRound =
2415 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2417 preFlow(that);
2418 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2420 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2422 if (!isSpeculativeRound) {
2423 //add thrown types as bounds to the thrown types free variables if needed:
2424 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2425 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2426 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asFree(lambdaType.getThrownTypes());
2428 chk.unhandled(inferredThrownTypes, thrownTypes);
2429 }
2431 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2432 }
2433 result = check(that, currentTarget, VAL, resultInfo);
2434 } catch (Types.FunctionDescriptorLookupError ex) {
2435 JCDiagnostic cause = ex.getDiagnostic();
2436 resultInfo.checkContext.report(that, cause);
2437 result = that.type = types.createErrorType(pt());
2438 return;
2439 } finally {
2440 localEnv.info.scope.leave();
2441 if (needsRecovery) {
2442 attribTree(that, env, recoveryInfo);
2443 }
2444 }
2445 }
2446 //where
2447 void preFlow(JCLambda tree) {
2448 new PostAttrAnalyzer() {
2449 @Override
2450 public void scan(JCTree tree) {
2451 if (tree == null ||
2452 (tree.type != null &&
2453 tree.type == Type.stuckType)) {
2454 //don't touch stuck expressions!
2455 return;
2456 }
2457 super.scan(tree);
2458 }
2459 }.scan(tree);
2460 }
2462 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2464 @Override
2465 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2466 return t.isCompound() ?
2467 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2468 }
2470 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2471 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2472 Type target = null;
2473 for (Type bound : ict.getExplicitComponents()) {
2474 TypeSymbol boundSym = bound.tsym;
2475 if (types.isFunctionalInterface(boundSym) &&
2476 types.findDescriptorSymbol(boundSym) == desc) {
2477 target = bound;
2478 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2479 //bound must be an interface
2480 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2481 }
2482 }
2483 return target != null ?
2484 target :
2485 ict.getExplicitComponents().head; //error recovery
2486 }
2488 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2489 ListBuffer<Type> targs = new ListBuffer<>();
2490 ListBuffer<Type> supertypes = new ListBuffer<>();
2491 for (Type i : ict.interfaces_field) {
2492 if (i.isParameterized()) {
2493 targs.appendList(i.tsym.type.allparams());
2494 }
2495 supertypes.append(i.tsym.type);
2496 }
2497 IntersectionClassType notionalIntf =
2498 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2499 notionalIntf.allparams_field = targs.toList();
2500 notionalIntf.tsym.flags_field |= INTERFACE;
2501 return notionalIntf.tsym;
2502 }
2504 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2505 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2506 diags.fragment(key, args)));
2507 }
2508 };
2510 private Type fallbackDescriptorType(JCExpression tree) {
2511 switch (tree.getTag()) {
2512 case LAMBDA:
2513 JCLambda lambda = (JCLambda)tree;
2514 List<Type> argtypes = List.nil();
2515 for (JCVariableDecl param : lambda.params) {
2516 argtypes = param.vartype != null ?
2517 argtypes.append(param.vartype.type) :
2518 argtypes.append(syms.errType);
2519 }
2520 return new MethodType(argtypes, Type.recoveryType,
2521 List.of(syms.throwableType), syms.methodClass);
2522 case REFERENCE:
2523 return new MethodType(List.<Type>nil(), Type.recoveryType,
2524 List.of(syms.throwableType), syms.methodClass);
2525 default:
2526 Assert.error("Cannot get here!");
2527 }
2528 return null;
2529 }
2531 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2532 final InferenceContext inferenceContext, final Type... ts) {
2533 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2534 }
2536 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2537 final InferenceContext inferenceContext, final List<Type> ts) {
2538 if (inferenceContext.free(ts)) {
2539 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2540 @Override
2541 public void typesInferred(InferenceContext inferenceContext) {
2542 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2543 }
2544 });
2545 } else {
2546 for (Type t : ts) {
2547 rs.checkAccessibleType(env, t);
2548 }
2549 }
2550 }
2552 /**
2553 * Lambda/method reference have a special check context that ensures
2554 * that i.e. a lambda return type is compatible with the expected
2555 * type according to both the inherited context and the assignment
2556 * context.
2557 */
2558 class FunctionalReturnContext extends Check.NestedCheckContext {
2560 FunctionalReturnContext(CheckContext enclosingContext) {
2561 super(enclosingContext);
2562 }
2564 @Override
2565 public boolean compatible(Type found, Type req, Warner warn) {
2566 //return type must be compatible in both current context and assignment context
2567 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2568 }
2570 @Override
2571 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2572 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2573 }
2574 }
2576 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2578 JCExpression expr;
2580 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2581 super(enclosingContext);
2582 this.expr = expr;
2583 }
2585 @Override
2586 public boolean compatible(Type found, Type req, Warner warn) {
2587 //a void return is compatible with an expression statement lambda
2588 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2589 super.compatible(found, req, warn);
2590 }
2591 }
2593 /**
2594 * Lambda compatibility. Check that given return types, thrown types, parameter types
2595 * are compatible with the expected functional interface descriptor. This means that:
2596 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2597 * types must be compatible with the return type of the expected descriptor.
2598 */
2599 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2600 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2602 //return values have already been checked - but if lambda has no return
2603 //values, we must ensure that void/value compatibility is correct;
2604 //this amounts at checking that, if a lambda body can complete normally,
2605 //the descriptor's return type must be void
2606 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2607 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2608 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2609 diags.fragment("missing.ret.val", returnType)));
2610 }
2612 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2613 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2614 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2615 }
2616 }
2618 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2619 Env<AttrContext> lambdaEnv;
2620 Symbol owner = env.info.scope.owner;
2621 if (owner.kind == VAR && owner.owner.kind == TYP) {
2622 //field initializer
2623 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2624 lambdaEnv.info.scope.owner =
2625 new MethodSymbol((owner.flags() & STATIC) | BLOCK, names.empty, null,
2626 env.info.scope.owner);
2627 } else {
2628 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2629 }
2630 return lambdaEnv;
2631 }
2633 @Override
2634 public void visitReference(final JCMemberReference that) {
2635 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2636 if (pt().hasTag(NONE)) {
2637 //method reference only allowed in assignment or method invocation/cast context
2638 log.error(that.pos(), "unexpected.mref");
2639 }
2640 result = that.type = types.createErrorType(pt());
2641 return;
2642 }
2643 final Env<AttrContext> localEnv = env.dup(that);
2644 try {
2645 //attribute member reference qualifier - if this is a constructor
2646 //reference, the expected kind must be a type
2647 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2649 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2650 exprType = chk.checkConstructorRefType(that.expr, exprType);
2651 if (!exprType.isErroneous() &&
2652 exprType.isRaw() &&
2653 that.typeargs != null) {
2654 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2655 diags.fragment("mref.infer.and.explicit.params"));
2656 exprType = types.createErrorType(exprType);
2657 }
2658 }
2660 if (exprType.isErroneous()) {
2661 //if the qualifier expression contains problems,
2662 //give up attribution of method reference
2663 result = that.type = exprType;
2664 return;
2665 }
2667 if (TreeInfo.isStaticSelector(that.expr, names)) {
2668 //if the qualifier is a type, validate it; raw warning check is
2669 //omitted as we don't know at this stage as to whether this is a
2670 //raw selector (because of inference)
2671 chk.validate(that.expr, env, false);
2672 }
2674 //attrib type-arguments
2675 List<Type> typeargtypes = List.nil();
2676 if (that.typeargs != null) {
2677 typeargtypes = attribTypes(that.typeargs, localEnv);
2678 }
2680 Type target;
2681 Type desc;
2682 if (pt() != Type.recoveryType) {
2683 target = targetChecker.visit(pt(), that);
2684 desc = types.findDescriptorType(target);
2685 } else {
2686 target = Type.recoveryType;
2687 desc = fallbackDescriptorType(that);
2688 }
2690 setFunctionalInfo(localEnv, that, pt(), desc, target, resultInfo.checkContext);
2691 List<Type> argtypes = desc.getParameterTypes();
2692 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2694 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2695 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2696 }
2698 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2699 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2700 try {
2701 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
2702 that.name, argtypes, typeargtypes, referenceCheck,
2703 resultInfo.checkContext.inferenceContext(),
2704 resultInfo.checkContext.deferredAttrContext().mode);
2705 } finally {
2706 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2707 }
2709 Symbol refSym = refResult.fst;
2710 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2712 if (refSym.kind != MTH) {
2713 boolean targetError;
2714 switch (refSym.kind) {
2715 case ABSENT_MTH:
2716 targetError = false;
2717 break;
2718 case WRONG_MTH:
2719 case WRONG_MTHS:
2720 case AMBIGUOUS:
2721 case HIDDEN:
2722 case STATICERR:
2723 case MISSING_ENCL:
2724 case WRONG_STATICNESS:
2725 targetError = true;
2726 break;
2727 default:
2728 Assert.error("unexpected result kind " + refSym.kind);
2729 targetError = false;
2730 }
2732 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2733 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2735 JCDiagnostic.DiagnosticType diagKind = targetError ?
2736 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2738 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2739 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2741 if (targetError && target == Type.recoveryType) {
2742 //a target error doesn't make sense during recovery stage
2743 //as we don't know what actual parameter types are
2744 result = that.type = target;
2745 return;
2746 } else {
2747 if (targetError) {
2748 resultInfo.checkContext.report(that, diag);
2749 } else {
2750 log.report(diag);
2751 }
2752 result = that.type = types.createErrorType(target);
2753 return;
2754 }
2755 }
2757 that.sym = refSym.baseSymbol();
2758 that.kind = lookupHelper.referenceKind(that.sym);
2759 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2761 if (desc.getReturnType() == Type.recoveryType) {
2762 // stop here
2763 result = that.type = target;
2764 return;
2765 }
2767 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2769 if (that.getMode() == ReferenceMode.INVOKE &&
2770 TreeInfo.isStaticSelector(that.expr, names) &&
2771 that.kind.isUnbound() &&
2772 !desc.getParameterTypes().head.isParameterized()) {
2773 chk.checkRaw(that.expr, localEnv);
2774 }
2776 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2777 exprType.getTypeArguments().nonEmpty()) {
2778 //static ref with class type-args
2779 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2780 diags.fragment("static.mref.with.targs"));
2781 result = that.type = types.createErrorType(target);
2782 return;
2783 }
2785 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2786 !that.kind.isUnbound()) {
2787 //no static bound mrefs
2788 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2789 diags.fragment("static.bound.mref"));
2790 result = that.type = types.createErrorType(target);
2791 return;
2792 }
2794 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2795 // Check that super-qualified symbols are not abstract (JLS)
2796 rs.checkNonAbstract(that.pos(), that.sym);
2797 }
2798 }
2800 ResultInfo checkInfo =
2801 resultInfo.dup(newMethodTemplate(
2802 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2803 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes));
2805 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2807 if (that.kind.isUnbound() &&
2808 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2809 //re-generate inference constraints for unbound receiver
2810 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asFree(argtypes.head), exprType)) {
2811 //cannot happen as this has already been checked - we just need
2812 //to regenerate the inference constraints, as that has been lost
2813 //as a result of the call to inferenceContext.save()
2814 Assert.error("Can't get here");
2815 }
2816 }
2818 if (!refType.isErroneous()) {
2819 refType = types.createMethodTypeWithReturn(refType,
2820 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2821 }
2823 //go ahead with standard method reference compatibility check - note that param check
2824 //is a no-op (as this has been taken care during method applicability)
2825 boolean isSpeculativeRound =
2826 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2827 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2828 if (!isSpeculativeRound) {
2829 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2830 }
2831 result = check(that, target, VAL, resultInfo);
2832 } catch (Types.FunctionDescriptorLookupError ex) {
2833 JCDiagnostic cause = ex.getDiagnostic();
2834 resultInfo.checkContext.report(that, cause);
2835 result = that.type = types.createErrorType(pt());
2836 return;
2837 }
2838 }
2839 //where
2840 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2841 //if this is a constructor reference, the expected kind must be a type
2842 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2843 }
2846 @SuppressWarnings("fallthrough")
2847 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2848 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2850 Type resType;
2851 switch (tree.getMode()) {
2852 case NEW:
2853 if (!tree.expr.type.isRaw()) {
2854 resType = tree.expr.type;
2855 break;
2856 }
2857 default:
2858 resType = refType.getReturnType();
2859 }
2861 Type incompatibleReturnType = resType;
2863 if (returnType.hasTag(VOID)) {
2864 incompatibleReturnType = null;
2865 }
2867 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2868 if (resType.isErroneous() ||
2869 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2870 incompatibleReturnType = null;
2871 }
2872 }
2874 if (incompatibleReturnType != null) {
2875 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2876 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2877 }
2879 if (!speculativeAttr) {
2880 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2881 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2882 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2883 }
2884 }
2885 }
2887 /**
2888 * Set functional type info on the underlying AST. Note: as the target descriptor
2889 * might contain inference variables, we might need to register an hook in the
2890 * current inference context.
2891 */
2892 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2893 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2894 if (checkContext.inferenceContext().free(descriptorType)) {
2895 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2896 public void typesInferred(InferenceContext inferenceContext) {
2897 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2898 inferenceContext.asInstType(primaryTarget), checkContext);
2899 }
2900 });
2901 } else {
2902 ListBuffer<Type> targets = new ListBuffer<>();
2903 if (pt.hasTag(CLASS)) {
2904 if (pt.isCompound()) {
2905 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2906 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2907 if (t != primaryTarget) {
2908 targets.append(types.removeWildcards(t));
2909 }
2910 }
2911 } else {
2912 targets.append(types.removeWildcards(primaryTarget));
2913 }
2914 }
2915 fExpr.targets = targets.toList();
2916 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2917 pt != Type.recoveryType) {
2918 //check that functional interface class is well-formed
2919 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2920 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2921 if (csym != null) {
2922 chk.checkImplementations(env.tree, csym, csym);
2923 }
2924 }
2925 }
2926 }
2928 public void visitParens(JCParens tree) {
2929 Type owntype = attribTree(tree.expr, env, resultInfo);
2930 result = check(tree, owntype, pkind(), resultInfo);
2931 Symbol sym = TreeInfo.symbol(tree);
2932 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2933 log.error(tree.pos(), "illegal.start.of.type");
2934 }
2936 public void visitAssign(JCAssign tree) {
2937 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2938 Type capturedType = capture(owntype);
2939 attribExpr(tree.rhs, env, owntype);
2940 result = check(tree, capturedType, VAL, resultInfo);
2941 }
2943 public void visitAssignop(JCAssignOp tree) {
2944 // Attribute arguments.
2945 Type owntype = attribTree(tree.lhs, env, varInfo);
2946 Type operand = attribExpr(tree.rhs, env);
2947 // Find operator.
2948 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2949 tree.pos(), tree.getTag().noAssignOp(), env,
2950 owntype, operand);
2952 if (operator.kind == MTH &&
2953 !owntype.isErroneous() &&
2954 !operand.isErroneous()) {
2955 chk.checkOperator(tree.pos(),
2956 (OperatorSymbol)operator,
2957 tree.getTag().noAssignOp(),
2958 owntype,
2959 operand);
2960 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2961 chk.checkCastable(tree.rhs.pos(),
2962 operator.type.getReturnType(),
2963 owntype);
2964 }
2965 result = check(tree, owntype, VAL, resultInfo);
2966 }
2968 public void visitUnary(JCUnary tree) {
2969 // Attribute arguments.
2970 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2971 ? attribTree(tree.arg, env, varInfo)
2972 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2974 // Find operator.
2975 Symbol operator = tree.operator =
2976 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2978 Type owntype = types.createErrorType(tree.type);
2979 if (operator.kind == MTH &&
2980 !argtype.isErroneous()) {
2981 owntype = (tree.getTag().isIncOrDecUnaryOp())
2982 ? tree.arg.type
2983 : operator.type.getReturnType();
2984 int opc = ((OperatorSymbol)operator).opcode;
2986 // If the argument is constant, fold it.
2987 if (argtype.constValue() != null) {
2988 Type ctype = cfolder.fold1(opc, argtype);
2989 if (ctype != null) {
2990 owntype = cfolder.coerce(ctype, owntype);
2992 // Remove constant types from arguments to
2993 // conserve space. The parser will fold concatenations
2994 // of string literals; the code here also
2995 // gets rid of intermediate results when some of the
2996 // operands are constant identifiers.
2997 if (tree.arg.type.tsym == syms.stringType.tsym) {
2998 tree.arg.type = syms.stringType;
2999 }
3000 }
3001 }
3002 }
3003 result = check(tree, owntype, VAL, resultInfo);
3004 }
3006 public void visitBinary(JCBinary tree) {
3007 // Attribute arguments.
3008 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3009 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3011 // Find operator.
3012 Symbol operator = tree.operator =
3013 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3015 Type owntype = types.createErrorType(tree.type);
3016 if (operator.kind == MTH &&
3017 !left.isErroneous() &&
3018 !right.isErroneous()) {
3019 owntype = operator.type.getReturnType();
3020 // This will figure out when unboxing can happen and
3021 // choose the right comparison operator.
3022 int opc = chk.checkOperator(tree.lhs.pos(),
3023 (OperatorSymbol)operator,
3024 tree.getTag(),
3025 left,
3026 right);
3028 // If both arguments are constants, fold them.
3029 if (left.constValue() != null && right.constValue() != null) {
3030 Type ctype = cfolder.fold2(opc, left, right);
3031 if (ctype != null) {
3032 owntype = cfolder.coerce(ctype, owntype);
3034 // Remove constant types from arguments to
3035 // conserve space. The parser will fold concatenations
3036 // of string literals; the code here also
3037 // gets rid of intermediate results when some of the
3038 // operands are constant identifiers.
3039 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3040 tree.lhs.type = syms.stringType;
3041 }
3042 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3043 tree.rhs.type = syms.stringType;
3044 }
3045 }
3046 }
3048 // Check that argument types of a reference ==, != are
3049 // castable to each other, (JLS 15.21). Note: unboxing
3050 // comparisons will not have an acmp* opc at this point.
3051 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3052 if (!types.isEqualityComparable(left, right,
3053 new Warner(tree.pos()))) {
3054 log.error(tree.pos(), "incomparable.types", left, right);
3055 }
3056 }
3058 chk.checkDivZero(tree.rhs.pos(), operator, right);
3059 }
3060 result = check(tree, owntype, VAL, resultInfo);
3061 }
3063 public void visitTypeCast(final JCTypeCast tree) {
3064 Type clazztype = attribType(tree.clazz, env);
3065 chk.validate(tree.clazz, env, false);
3066 //a fresh environment is required for 292 inference to work properly ---
3067 //see Infer.instantiatePolymorphicSignatureInstance()
3068 Env<AttrContext> localEnv = env.dup(tree);
3069 //should we propagate the target type?
3070 final ResultInfo castInfo;
3071 JCExpression expr = TreeInfo.skipParens(tree.expr);
3072 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3073 if (isPoly) {
3074 //expression is a poly - we need to propagate target type info
3075 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3076 @Override
3077 public boolean compatible(Type found, Type req, Warner warn) {
3078 return types.isCastable(found, req, warn);
3079 }
3080 });
3081 } else {
3082 //standalone cast - target-type info is not propagated
3083 castInfo = unknownExprInfo;
3084 }
3085 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3086 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3087 if (exprtype.constValue() != null)
3088 owntype = cfolder.coerce(exprtype, owntype);
3089 result = check(tree, capture(owntype), VAL, resultInfo);
3090 if (!isPoly)
3091 chk.checkRedundantCast(localEnv, tree);
3092 }
3094 public void visitTypeTest(JCInstanceOf tree) {
3095 Type exprtype = chk.checkNullOrRefType(
3096 tree.expr.pos(), attribExpr(tree.expr, env));
3097 Type clazztype = attribType(tree.clazz, env);
3098 if (!clazztype.hasTag(TYPEVAR)) {
3099 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3100 }
3101 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3102 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3103 clazztype = types.createErrorType(clazztype);
3104 }
3105 chk.validate(tree.clazz, env, false);
3106 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3107 result = check(tree, syms.booleanType, VAL, resultInfo);
3108 }
3110 public void visitIndexed(JCArrayAccess tree) {
3111 Type owntype = types.createErrorType(tree.type);
3112 Type atype = attribExpr(tree.indexed, env);
3113 attribExpr(tree.index, env, syms.intType);
3114 if (types.isArray(atype))
3115 owntype = types.elemtype(atype);
3116 else if (!atype.hasTag(ERROR))
3117 log.error(tree.pos(), "array.req.but.found", atype);
3118 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3119 result = check(tree, owntype, VAR, resultInfo);
3120 }
3122 public void visitIdent(JCIdent tree) {
3123 Symbol sym;
3125 // Find symbol
3126 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3127 // If we are looking for a method, the prototype `pt' will be a
3128 // method type with the type of the call's arguments as parameters.
3129 env.info.pendingResolutionPhase = null;
3130 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3131 } else if (tree.sym != null && tree.sym.kind != VAR) {
3132 sym = tree.sym;
3133 } else {
3134 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3135 }
3136 tree.sym = sym;
3138 // (1) Also find the environment current for the class where
3139 // sym is defined (`symEnv').
3140 // Only for pre-tiger versions (1.4 and earlier):
3141 // (2) Also determine whether we access symbol out of an anonymous
3142 // class in a this or super call. This is illegal for instance
3143 // members since such classes don't carry a this$n link.
3144 // (`noOuterThisPath').
3145 Env<AttrContext> symEnv = env;
3146 boolean noOuterThisPath = false;
3147 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3148 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3149 sym.owner.kind == TYP &&
3150 tree.name != names._this && tree.name != names._super) {
3152 // Find environment in which identifier is defined.
3153 while (symEnv.outer != null &&
3154 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3155 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3156 noOuterThisPath = !allowAnonOuterThis;
3157 symEnv = symEnv.outer;
3158 }
3159 }
3161 // If symbol is a variable, ...
3162 if (sym.kind == VAR) {
3163 VarSymbol v = (VarSymbol)sym;
3165 // ..., evaluate its initializer, if it has one, and check for
3166 // illegal forward reference.
3167 checkInit(tree, env, v, false);
3169 // If we are expecting a variable (as opposed to a value), check
3170 // that the variable is assignable in the current environment.
3171 if (pkind() == VAR)
3172 checkAssignable(tree.pos(), v, null, env);
3173 }
3175 // In a constructor body,
3176 // if symbol is a field or instance method, check that it is
3177 // not accessed before the supertype constructor is called.
3178 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3179 (sym.kind & (VAR | MTH)) != 0 &&
3180 sym.owner.kind == TYP &&
3181 (sym.flags() & STATIC) == 0) {
3182 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3183 }
3184 Env<AttrContext> env1 = env;
3185 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3186 // If the found symbol is inaccessible, then it is
3187 // accessed through an enclosing instance. Locate this
3188 // enclosing instance:
3189 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3190 env1 = env1.outer;
3191 }
3192 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3193 }
3195 public void visitSelect(JCFieldAccess tree) {
3196 // Determine the expected kind of the qualifier expression.
3197 int skind = 0;
3198 if (tree.name == names._this || tree.name == names._super ||
3199 tree.name == names._class)
3200 {
3201 skind = TYP;
3202 } else {
3203 if ((pkind() & PCK) != 0) skind = skind | PCK;
3204 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3205 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3206 }
3208 // Attribute the qualifier expression, and determine its symbol (if any).
3209 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3210 if ((pkind() & (PCK | TYP)) == 0)
3211 site = capture(site); // Capture field access
3213 // don't allow T.class T[].class, etc
3214 if (skind == TYP) {
3215 Type elt = site;
3216 while (elt.hasTag(ARRAY))
3217 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3218 if (elt.hasTag(TYPEVAR)) {
3219 log.error(tree.pos(), "type.var.cant.be.deref");
3220 result = types.createErrorType(tree.type);
3221 return;
3222 }
3223 }
3225 // If qualifier symbol is a type or `super', assert `selectSuper'
3226 // for the selection. This is relevant for determining whether
3227 // protected symbols are accessible.
3228 Symbol sitesym = TreeInfo.symbol(tree.selected);
3229 boolean selectSuperPrev = env.info.selectSuper;
3230 env.info.selectSuper =
3231 sitesym != null &&
3232 sitesym.name == names._super;
3234 // Determine the symbol represented by the selection.
3235 env.info.pendingResolutionPhase = null;
3236 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3237 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3238 site = capture(site);
3239 sym = selectSym(tree, sitesym, site, env, resultInfo);
3240 }
3241 boolean varArgs = env.info.lastResolveVarargs();
3242 tree.sym = sym;
3244 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3245 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3246 site = capture(site);
3247 }
3249 // If that symbol is a variable, ...
3250 if (sym.kind == VAR) {
3251 VarSymbol v = (VarSymbol)sym;
3253 // ..., evaluate its initializer, if it has one, and check for
3254 // illegal forward reference.
3255 checkInit(tree, env, v, true);
3257 // If we are expecting a variable (as opposed to a value), check
3258 // that the variable is assignable in the current environment.
3259 if (pkind() == VAR)
3260 checkAssignable(tree.pos(), v, tree.selected, env);
3261 }
3263 if (sitesym != null &&
3264 sitesym.kind == VAR &&
3265 ((VarSymbol)sitesym).isResourceVariable() &&
3266 sym.kind == MTH &&
3267 sym.name.equals(names.close) &&
3268 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3269 env.info.lint.isEnabled(LintCategory.TRY)) {
3270 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3271 }
3273 // Disallow selecting a type from an expression
3274 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3275 tree.type = check(tree.selected, pt(),
3276 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3277 }
3279 if (isType(sitesym)) {
3280 if (sym.name == names._this) {
3281 // If `C' is the currently compiled class, check that
3282 // C.this' does not appear in a call to a super(...)
3283 if (env.info.isSelfCall &&
3284 site.tsym == env.enclClass.sym) {
3285 chk.earlyRefError(tree.pos(), sym);
3286 }
3287 } else {
3288 // Check if type-qualified fields or methods are static (JLS)
3289 if ((sym.flags() & STATIC) == 0 &&
3290 !env.next.tree.hasTag(REFERENCE) &&
3291 sym.name != names._super &&
3292 (sym.kind == VAR || sym.kind == MTH)) {
3293 rs.accessBase(rs.new StaticError(sym),
3294 tree.pos(), site, sym.name, true);
3295 }
3296 }
3297 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3298 // If the qualified item is not a type and the selected item is static, report
3299 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3300 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3301 }
3303 // If we are selecting an instance member via a `super', ...
3304 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3306 // Check that super-qualified symbols are not abstract (JLS)
3307 rs.checkNonAbstract(tree.pos(), sym);
3309 if (site.isRaw()) {
3310 // Determine argument types for site.
3311 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3312 if (site1 != null) site = site1;
3313 }
3314 }
3316 env.info.selectSuper = selectSuperPrev;
3317 result = checkId(tree, site, sym, env, resultInfo);
3318 }
3319 //where
3320 /** Determine symbol referenced by a Select expression,
3321 *
3322 * @param tree The select tree.
3323 * @param site The type of the selected expression,
3324 * @param env The current environment.
3325 * @param resultInfo The current result.
3326 */
3327 private Symbol selectSym(JCFieldAccess tree,
3328 Symbol location,
3329 Type site,
3330 Env<AttrContext> env,
3331 ResultInfo resultInfo) {
3332 DiagnosticPosition pos = tree.pos();
3333 Name name = tree.name;
3334 switch (site.getTag()) {
3335 case PACKAGE:
3336 return rs.accessBase(
3337 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3338 pos, location, site, name, true);
3339 case ARRAY:
3340 case CLASS:
3341 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3342 return rs.resolveQualifiedMethod(
3343 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3344 } else if (name == names._this || name == names._super) {
3345 return rs.resolveSelf(pos, env, site.tsym, name);
3346 } else if (name == names._class) {
3347 // In this case, we have already made sure in
3348 // visitSelect that qualifier expression is a type.
3349 Type t = syms.classType;
3350 List<Type> typeargs = allowGenerics
3351 ? List.of(types.erasure(site))
3352 : List.<Type>nil();
3353 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3354 return new VarSymbol(
3355 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3356 } else {
3357 // We are seeing a plain identifier as selector.
3358 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3359 if ((resultInfo.pkind & ERRONEOUS) == 0)
3360 sym = rs.accessBase(sym, pos, location, site, name, true);
3361 return sym;
3362 }
3363 case WILDCARD:
3364 throw new AssertionError(tree);
3365 case TYPEVAR:
3366 // Normally, site.getUpperBound() shouldn't be null.
3367 // It should only happen during memberEnter/attribBase
3368 // when determining the super type which *must* beac
3369 // done before attributing the type variables. In
3370 // other words, we are seeing this illegal program:
3371 // class B<T> extends A<T.foo> {}
3372 Symbol sym = (site.getUpperBound() != null)
3373 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3374 : null;
3375 if (sym == null) {
3376 log.error(pos, "type.var.cant.be.deref");
3377 return syms.errSymbol;
3378 } else {
3379 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3380 rs.new AccessError(env, site, sym) :
3381 sym;
3382 rs.accessBase(sym2, pos, location, site, name, true);
3383 return sym;
3384 }
3385 case ERROR:
3386 // preserve identifier names through errors
3387 return types.createErrorType(name, site.tsym, site).tsym;
3388 default:
3389 // The qualifier expression is of a primitive type -- only
3390 // .class is allowed for these.
3391 if (name == names._class) {
3392 // In this case, we have already made sure in Select that
3393 // qualifier expression is a type.
3394 Type t = syms.classType;
3395 Type arg = types.boxedClass(site).type;
3396 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3397 return new VarSymbol(
3398 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3399 } else {
3400 log.error(pos, "cant.deref", site);
3401 return syms.errSymbol;
3402 }
3403 }
3404 }
3406 /** Determine type of identifier or select expression and check that
3407 * (1) the referenced symbol is not deprecated
3408 * (2) the symbol's type is safe (@see checkSafe)
3409 * (3) if symbol is a variable, check that its type and kind are
3410 * compatible with the prototype and protokind.
3411 * (4) if symbol is an instance field of a raw type,
3412 * which is being assigned to, issue an unchecked warning if its
3413 * type changes under erasure.
3414 * (5) if symbol is an instance method of a raw type, issue an
3415 * unchecked warning if its argument types change under erasure.
3416 * If checks succeed:
3417 * If symbol is a constant, return its constant type
3418 * else if symbol is a method, return its result type
3419 * otherwise return its type.
3420 * Otherwise return errType.
3421 *
3422 * @param tree The syntax tree representing the identifier
3423 * @param site If this is a select, the type of the selected
3424 * expression, otherwise the type of the current class.
3425 * @param sym The symbol representing the identifier.
3426 * @param env The current environment.
3427 * @param resultInfo The expected result
3428 */
3429 Type checkId(JCTree tree,
3430 Type site,
3431 Symbol sym,
3432 Env<AttrContext> env,
3433 ResultInfo resultInfo) {
3434 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3435 checkMethodId(tree, site, sym, env, resultInfo) :
3436 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3437 }
3439 Type checkMethodId(JCTree tree,
3440 Type site,
3441 Symbol sym,
3442 Env<AttrContext> env,
3443 ResultInfo resultInfo) {
3444 boolean isPolymorhicSignature =
3445 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3446 return isPolymorhicSignature ?
3447 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3448 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3449 }
3451 Type checkSigPolyMethodId(JCTree tree,
3452 Type site,
3453 Symbol sym,
3454 Env<AttrContext> env,
3455 ResultInfo resultInfo) {
3456 //recover original symbol for signature polymorphic methods
3457 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3458 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3459 return sym.type;
3460 }
3462 Type checkMethodIdInternal(JCTree tree,
3463 Type site,
3464 Symbol sym,
3465 Env<AttrContext> env,
3466 ResultInfo resultInfo) {
3467 if ((resultInfo.pkind & POLY) != 0) {
3468 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3469 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3470 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3471 return owntype;
3472 } else {
3473 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3474 }
3475 }
3477 Type checkIdInternal(JCTree tree,
3478 Type site,
3479 Symbol sym,
3480 Type pt,
3481 Env<AttrContext> env,
3482 ResultInfo resultInfo) {
3483 if (pt.isErroneous()) {
3484 return types.createErrorType(site);
3485 }
3486 Type owntype; // The computed type of this identifier occurrence.
3487 switch (sym.kind) {
3488 case TYP:
3489 // For types, the computed type equals the symbol's type,
3490 // except for two situations:
3491 owntype = sym.type;
3492 if (owntype.hasTag(CLASS)) {
3493 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3494 Type ownOuter = owntype.getEnclosingType();
3496 // (a) If the symbol's type is parameterized, erase it
3497 // because no type parameters were given.
3498 // We recover generic outer type later in visitTypeApply.
3499 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3500 owntype = types.erasure(owntype);
3501 }
3503 // (b) If the symbol's type is an inner class, then
3504 // we have to interpret its outer type as a superclass
3505 // of the site type. Example:
3506 //
3507 // class Tree<A> { class Visitor { ... } }
3508 // class PointTree extends Tree<Point> { ... }
3509 // ...PointTree.Visitor...
3510 //
3511 // Then the type of the last expression above is
3512 // Tree<Point>.Visitor.
3513 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3514 Type normOuter = site;
3515 if (normOuter.hasTag(CLASS)) {
3516 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3517 }
3518 if (normOuter == null) // perhaps from an import
3519 normOuter = types.erasure(ownOuter);
3520 if (normOuter != ownOuter)
3521 owntype = new ClassType(
3522 normOuter, List.<Type>nil(), owntype.tsym);
3523 }
3524 }
3525 break;
3526 case VAR:
3527 VarSymbol v = (VarSymbol)sym;
3528 // Test (4): if symbol is an instance field of a raw type,
3529 // which is being assigned to, issue an unchecked warning if
3530 // its type changes under erasure.
3531 if (allowGenerics &&
3532 resultInfo.pkind == VAR &&
3533 v.owner.kind == TYP &&
3534 (v.flags() & STATIC) == 0 &&
3535 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3536 Type s = types.asOuterSuper(site, v.owner);
3537 if (s != null &&
3538 s.isRaw() &&
3539 !types.isSameType(v.type, v.erasure(types))) {
3540 chk.warnUnchecked(tree.pos(),
3541 "unchecked.assign.to.var",
3542 v, s);
3543 }
3544 }
3545 // The computed type of a variable is the type of the
3546 // variable symbol, taken as a member of the site type.
3547 owntype = (sym.owner.kind == TYP &&
3548 sym.name != names._this && sym.name != names._super)
3549 ? types.memberType(site, sym)
3550 : sym.type;
3552 // If the variable is a constant, record constant value in
3553 // computed type.
3554 if (v.getConstValue() != null && isStaticReference(tree))
3555 owntype = owntype.constType(v.getConstValue());
3557 if (resultInfo.pkind == VAL) {
3558 owntype = capture(owntype); // capture "names as expressions"
3559 }
3560 break;
3561 case MTH: {
3562 owntype = checkMethod(site, sym,
3563 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3564 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3565 resultInfo.pt.getTypeArguments());
3566 break;
3567 }
3568 case PCK: case ERR:
3569 owntype = sym.type;
3570 break;
3571 default:
3572 throw new AssertionError("unexpected kind: " + sym.kind +
3573 " in tree " + tree);
3574 }
3576 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3577 // (for constructors, the error was given when the constructor was
3578 // resolved)
3580 if (sym.name != names.init) {
3581 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3582 chk.checkSunAPI(tree.pos(), sym);
3583 chk.checkProfile(tree.pos(), sym);
3584 }
3586 // Test (3): if symbol is a variable, check that its type and
3587 // kind are compatible with the prototype and protokind.
3588 return check(tree, owntype, sym.kind, resultInfo);
3589 }
3591 /** Check that variable is initialized and evaluate the variable's
3592 * initializer, if not yet done. Also check that variable is not
3593 * referenced before it is defined.
3594 * @param tree The tree making up the variable reference.
3595 * @param env The current environment.
3596 * @param v The variable's symbol.
3597 */
3598 private void checkInit(JCTree tree,
3599 Env<AttrContext> env,
3600 VarSymbol v,
3601 boolean onlyWarning) {
3602 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3603 // tree.pos + " " + v.pos + " " +
3604 // Resolve.isStatic(env));//DEBUG
3606 // A forward reference is diagnosed if the declaration position
3607 // of the variable is greater than the current tree position
3608 // and the tree and variable definition occur in the same class
3609 // definition. Note that writes don't count as references.
3610 // This check applies only to class and instance
3611 // variables. Local variables follow different scope rules,
3612 // and are subject to definite assignment checking.
3613 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3614 v.owner.kind == TYP &&
3615 canOwnInitializer(owner(env)) &&
3616 v.owner == env.info.scope.owner.enclClass() &&
3617 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3618 (!env.tree.hasTag(ASSIGN) ||
3619 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3620 String suffix = (env.info.enclVar == v) ?
3621 "self.ref" : "forward.ref";
3622 if (!onlyWarning || isStaticEnumField(v)) {
3623 log.error(tree.pos(), "illegal." + suffix);
3624 } else if (useBeforeDeclarationWarning) {
3625 log.warning(tree.pos(), suffix, v);
3626 }
3627 }
3629 v.getConstValue(); // ensure initializer is evaluated
3631 checkEnumInitializer(tree, env, v);
3632 }
3634 /**
3635 * Check for illegal references to static members of enum. In
3636 * an enum type, constructors and initializers may not
3637 * reference its static members unless they are constant.
3638 *
3639 * @param tree The tree making up the variable reference.
3640 * @param env The current environment.
3641 * @param v The variable's symbol.
3642 * @jls section 8.9 Enums
3643 */
3644 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3645 // JLS:
3646 //
3647 // "It is a compile-time error to reference a static field
3648 // of an enum type that is not a compile-time constant
3649 // (15.28) from constructors, instance initializer blocks,
3650 // or instance variable initializer expressions of that
3651 // type. It is a compile-time error for the constructors,
3652 // instance initializer blocks, or instance variable
3653 // initializer expressions of an enum constant e to refer
3654 // to itself or to an enum constant of the same type that
3655 // is declared to the right of e."
3656 if (isStaticEnumField(v)) {
3657 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3659 if (enclClass == null || enclClass.owner == null)
3660 return;
3662 // See if the enclosing class is the enum (or a
3663 // subclass thereof) declaring v. If not, this
3664 // reference is OK.
3665 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3666 return;
3668 // If the reference isn't from an initializer, then
3669 // the reference is OK.
3670 if (!Resolve.isInitializer(env))
3671 return;
3673 log.error(tree.pos(), "illegal.enum.static.ref");
3674 }
3675 }
3677 /** Is the given symbol a static, non-constant field of an Enum?
3678 * Note: enum literals should not be regarded as such
3679 */
3680 private boolean isStaticEnumField(VarSymbol v) {
3681 return Flags.isEnum(v.owner) &&
3682 Flags.isStatic(v) &&
3683 !Flags.isConstant(v) &&
3684 v.name != names._class;
3685 }
3687 /** Can the given symbol be the owner of code which forms part
3688 * if class initialization? This is the case if the symbol is
3689 * a type or field, or if the symbol is the synthetic method.
3690 * owning a block.
3691 */
3692 private boolean canOwnInitializer(Symbol sym) {
3693 return
3694 (sym.kind & (VAR | TYP)) != 0 ||
3695 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3696 }
3698 Warner noteWarner = new Warner();
3700 /**
3701 * Check that method arguments conform to its instantiation.
3702 **/
3703 public Type checkMethod(Type site,
3704 final Symbol sym,
3705 ResultInfo resultInfo,
3706 Env<AttrContext> env,
3707 final List<JCExpression> argtrees,
3708 List<Type> argtypes,
3709 List<Type> typeargtypes) {
3710 // Test (5): if symbol is an instance method of a raw type, issue
3711 // an unchecked warning if its argument types change under erasure.
3712 if (allowGenerics &&
3713 (sym.flags() & STATIC) == 0 &&
3714 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3715 Type s = types.asOuterSuper(site, sym.owner);
3716 if (s != null && s.isRaw() &&
3717 !types.isSameTypes(sym.type.getParameterTypes(),
3718 sym.erasure(types).getParameterTypes())) {
3719 chk.warnUnchecked(env.tree.pos(),
3720 "unchecked.call.mbr.of.raw.type",
3721 sym, s);
3722 }
3723 }
3725 if (env.info.defaultSuperCallSite != null) {
3726 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3727 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3728 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3729 List<MethodSymbol> icand_sup =
3730 types.interfaceCandidates(sup, (MethodSymbol)sym);
3731 if (icand_sup.nonEmpty() &&
3732 icand_sup.head != sym &&
3733 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3734 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3735 diags.fragment("overridden.default", sym, sup));
3736 break;
3737 }
3738 }
3739 env.info.defaultSuperCallSite = null;
3740 }
3742 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3743 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3744 if (app.meth.hasTag(SELECT) &&
3745 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3746 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3747 }
3748 }
3750 // Compute the identifier's instantiated type.
3751 // For methods, we need to compute the instance type by
3752 // Resolve.instantiate from the symbol's type as well as
3753 // any type arguments and value arguments.
3754 noteWarner.clear();
3755 try {
3756 Type owntype = rs.checkMethod(
3757 env,
3758 site,
3759 sym,
3760 resultInfo,
3761 argtypes,
3762 typeargtypes,
3763 noteWarner);
3765 DeferredAttr.DeferredTypeMap checkDeferredMap =
3766 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3768 argtypes = Type.map(argtypes, checkDeferredMap);
3770 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3771 chk.warnUnchecked(env.tree.pos(),
3772 "unchecked.meth.invocation.applied",
3773 kindName(sym),
3774 sym.name,
3775 rs.methodArguments(sym.type.getParameterTypes()),
3776 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3777 kindName(sym.location()),
3778 sym.location());
3779 owntype = new MethodType(owntype.getParameterTypes(),
3780 types.erasure(owntype.getReturnType()),
3781 types.erasure(owntype.getThrownTypes()),
3782 syms.methodClass);
3783 }
3785 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3786 resultInfo.checkContext.inferenceContext());
3787 } catch (Infer.InferenceException ex) {
3788 //invalid target type - propagate exception outwards or report error
3789 //depending on the current check context
3790 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3791 return types.createErrorType(site);
3792 } catch (Resolve.InapplicableMethodException ex) {
3793 final JCDiagnostic diag = ex.getDiagnostic();
3794 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3795 @Override
3796 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3797 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3798 }
3799 };
3800 List<Type> argtypes2 = Type.map(argtypes,
3801 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3802 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3803 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3804 log.report(errDiag);
3805 return types.createErrorType(site);
3806 }
3807 }
3809 public void visitLiteral(JCLiteral tree) {
3810 result = check(
3811 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3812 }
3813 //where
3814 /** Return the type of a literal with given type tag.
3815 */
3816 Type litType(TypeTag tag) {
3817 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3818 }
3820 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3821 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3822 }
3824 public void visitTypeArray(JCArrayTypeTree tree) {
3825 Type etype = attribType(tree.elemtype, env);
3826 Type type = new ArrayType(etype, syms.arrayClass);
3827 result = check(tree, type, TYP, resultInfo);
3828 }
3830 /** Visitor method for parameterized types.
3831 * Bound checking is left until later, since types are attributed
3832 * before supertype structure is completely known
3833 */
3834 public void visitTypeApply(JCTypeApply tree) {
3835 Type owntype = types.createErrorType(tree.type);
3837 // Attribute functor part of application and make sure it's a class.
3838 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3840 // Attribute type parameters
3841 List<Type> actuals = attribTypes(tree.arguments, env);
3843 if (clazztype.hasTag(CLASS)) {
3844 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3845 if (actuals.isEmpty()) //diamond
3846 actuals = formals;
3848 if (actuals.length() == formals.length()) {
3849 List<Type> a = actuals;
3850 List<Type> f = formals;
3851 while (a.nonEmpty()) {
3852 a.head = a.head.withTypeVar(f.head);
3853 a = a.tail;
3854 f = f.tail;
3855 }
3856 // Compute the proper generic outer
3857 Type clazzOuter = clazztype.getEnclosingType();
3858 if (clazzOuter.hasTag(CLASS)) {
3859 Type site;
3860 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3861 if (clazz.hasTag(IDENT)) {
3862 site = env.enclClass.sym.type;
3863 } else if (clazz.hasTag(SELECT)) {
3864 site = ((JCFieldAccess) clazz).selected.type;
3865 } else throw new AssertionError(""+tree);
3866 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3867 if (site.hasTag(CLASS))
3868 site = types.asOuterSuper(site, clazzOuter.tsym);
3869 if (site == null)
3870 site = types.erasure(clazzOuter);
3871 clazzOuter = site;
3872 }
3873 }
3874 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3875 } else {
3876 if (formals.length() != 0) {
3877 log.error(tree.pos(), "wrong.number.type.args",
3878 Integer.toString(formals.length()));
3879 } else {
3880 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3881 }
3882 owntype = types.createErrorType(tree.type);
3883 }
3884 }
3885 result = check(tree, owntype, TYP, resultInfo);
3886 }
3888 public void visitTypeUnion(JCTypeUnion tree) {
3889 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3890 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3891 for (JCExpression typeTree : tree.alternatives) {
3892 Type ctype = attribType(typeTree, env);
3893 ctype = chk.checkType(typeTree.pos(),
3894 chk.checkClassType(typeTree.pos(), ctype),
3895 syms.throwableType);
3896 if (!ctype.isErroneous()) {
3897 //check that alternatives of a union type are pairwise
3898 //unrelated w.r.t. subtyping
3899 if (chk.intersects(ctype, multicatchTypes.toList())) {
3900 for (Type t : multicatchTypes) {
3901 boolean sub = types.isSubtype(ctype, t);
3902 boolean sup = types.isSubtype(t, ctype);
3903 if (sub || sup) {
3904 //assume 'a' <: 'b'
3905 Type a = sub ? ctype : t;
3906 Type b = sub ? t : ctype;
3907 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3908 }
3909 }
3910 }
3911 multicatchTypes.append(ctype);
3912 if (all_multicatchTypes != null)
3913 all_multicatchTypes.append(ctype);
3914 } else {
3915 if (all_multicatchTypes == null) {
3916 all_multicatchTypes = new ListBuffer<>();
3917 all_multicatchTypes.appendList(multicatchTypes);
3918 }
3919 all_multicatchTypes.append(ctype);
3920 }
3921 }
3922 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3923 if (t.hasTag(CLASS)) {
3924 List<Type> alternatives =
3925 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3926 t = new UnionClassType((ClassType) t, alternatives);
3927 }
3928 tree.type = result = t;
3929 }
3931 public void visitTypeIntersection(JCTypeIntersection tree) {
3932 attribTypes(tree.bounds, env);
3933 tree.type = result = checkIntersection(tree, tree.bounds);
3934 }
3936 public void visitTypeParameter(JCTypeParameter tree) {
3937 TypeVar typeVar = (TypeVar) tree.type;
3939 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3940 annotateType(tree, tree.annotations);
3941 }
3943 if (!typeVar.bound.isErroneous()) {
3944 //fixup type-parameter bound computed in 'attribTypeVariables'
3945 typeVar.bound = checkIntersection(tree, tree.bounds);
3946 }
3947 }
3949 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3950 Set<Type> boundSet = new HashSet<Type>();
3951 if (bounds.nonEmpty()) {
3952 // accept class or interface or typevar as first bound.
3953 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3954 boundSet.add(types.erasure(bounds.head.type));
3955 if (bounds.head.type.isErroneous()) {
3956 return bounds.head.type;
3957 }
3958 else if (bounds.head.type.hasTag(TYPEVAR)) {
3959 // if first bound was a typevar, do not accept further bounds.
3960 if (bounds.tail.nonEmpty()) {
3961 log.error(bounds.tail.head.pos(),
3962 "type.var.may.not.be.followed.by.other.bounds");
3963 return bounds.head.type;
3964 }
3965 } else {
3966 // if first bound was a class or interface, accept only interfaces
3967 // as further bounds.
3968 for (JCExpression bound : bounds.tail) {
3969 bound.type = checkBase(bound.type, bound, env, false, true, false);
3970 if (bound.type.isErroneous()) {
3971 bounds = List.of(bound);
3972 }
3973 else if (bound.type.hasTag(CLASS)) {
3974 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3975 }
3976 }
3977 }
3978 }
3980 if (bounds.length() == 0) {
3981 return syms.objectType;
3982 } else if (bounds.length() == 1) {
3983 return bounds.head.type;
3984 } else {
3985 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3986 // ... the variable's bound is a class type flagged COMPOUND
3987 // (see comment for TypeVar.bound).
3988 // In this case, generate a class tree that represents the
3989 // bound class, ...
3990 JCExpression extending;
3991 List<JCExpression> implementing;
3992 if (!bounds.head.type.isInterface()) {
3993 extending = bounds.head;
3994 implementing = bounds.tail;
3995 } else {
3996 extending = null;
3997 implementing = bounds;
3998 }
3999 JCClassDecl cd = make.at(tree).ClassDef(
4000 make.Modifiers(PUBLIC | ABSTRACT),
4001 names.empty, List.<JCTypeParameter>nil(),
4002 extending, implementing, List.<JCTree>nil());
4004 ClassSymbol c = (ClassSymbol)owntype.tsym;
4005 Assert.check((c.flags() & COMPOUND) != 0);
4006 cd.sym = c;
4007 c.sourcefile = env.toplevel.sourcefile;
4009 // ... and attribute the bound class
4010 c.flags_field |= UNATTRIBUTED;
4011 Env<AttrContext> cenv = enter.classEnv(cd, env);
4012 enter.typeEnvs.put(c, cenv);
4013 attribClass(c);
4014 return owntype;
4015 }
4016 }
4018 public void visitWildcard(JCWildcard tree) {
4019 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4020 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4021 ? syms.objectType
4022 : attribType(tree.inner, env);
4023 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4024 tree.kind.kind,
4025 syms.boundClass),
4026 TYP, resultInfo);
4027 }
4029 public void visitAnnotation(JCAnnotation tree) {
4030 Assert.error("should be handled in Annotate");
4031 }
4033 public void visitAnnotatedType(JCAnnotatedType tree) {
4034 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4035 this.attribAnnotationTypes(tree.annotations, env);
4036 annotateType(tree, tree.annotations);
4037 result = tree.type = underlyingType;
4038 }
4040 /**
4041 * Apply the annotations to the particular type.
4042 */
4043 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4044 annotate.typeAnnotation(new Annotate.Worker() {
4045 @Override
4046 public String toString() {
4047 return "annotate " + annotations + " onto " + tree;
4048 }
4049 @Override
4050 public void run() {
4051 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4052 if (annotations.size() == compounds.size()) {
4053 // All annotations were successfully converted into compounds
4054 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4055 }
4056 }
4057 });
4058 }
4060 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4061 if (annotations.isEmpty()) {
4062 return List.nil();
4063 }
4065 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4066 for (JCAnnotation anno : annotations) {
4067 if (anno.attribute != null) {
4068 // TODO: this null-check is only needed for an obscure
4069 // ordering issue, where annotate.flush is called when
4070 // the attribute is not set yet. For an example failure
4071 // try the referenceinfos/NestedTypes.java test.
4072 // Any better solutions?
4073 buf.append((Attribute.TypeCompound) anno.attribute);
4074 }
4075 // Eventually we will want to throw an exception here, but
4076 // we can't do that just yet, because it gets triggered
4077 // when attempting to attach an annotation that isn't
4078 // defined.
4079 }
4080 return buf.toList();
4081 }
4083 public void visitErroneous(JCErroneous tree) {
4084 if (tree.errs != null)
4085 for (JCTree err : tree.errs)
4086 attribTree(err, env, new ResultInfo(ERR, pt()));
4087 result = tree.type = syms.errType;
4088 }
4090 /** Default visitor method for all other trees.
4091 */
4092 public void visitTree(JCTree tree) {
4093 throw new AssertionError();
4094 }
4096 /**
4097 * Attribute an env for either a top level tree or class declaration.
4098 */
4099 public void attrib(Env<AttrContext> env) {
4100 if (env.tree.hasTag(TOPLEVEL))
4101 attribTopLevel(env);
4102 else
4103 attribClass(env.tree.pos(), env.enclClass.sym);
4104 }
4106 /**
4107 * Attribute a top level tree. These trees are encountered when the
4108 * package declaration has annotations.
4109 */
4110 public void attribTopLevel(Env<AttrContext> env) {
4111 JCCompilationUnit toplevel = env.toplevel;
4112 try {
4113 annotate.flush();
4114 } catch (CompletionFailure ex) {
4115 chk.completionError(toplevel.pos(), ex);
4116 }
4117 }
4119 /** Main method: attribute class definition associated with given class symbol.
4120 * reporting completion failures at the given position.
4121 * @param pos The source position at which completion errors are to be
4122 * reported.
4123 * @param c The class symbol whose definition will be attributed.
4124 */
4125 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4126 try {
4127 annotate.flush();
4128 attribClass(c);
4129 } catch (CompletionFailure ex) {
4130 chk.completionError(pos, ex);
4131 }
4132 }
4134 /** Attribute class definition associated with given class symbol.
4135 * @param c The class symbol whose definition will be attributed.
4136 */
4137 void attribClass(ClassSymbol c) throws CompletionFailure {
4138 if (c.type.hasTag(ERROR)) return;
4140 // Check for cycles in the inheritance graph, which can arise from
4141 // ill-formed class files.
4142 chk.checkNonCyclic(null, c.type);
4144 Type st = types.supertype(c.type);
4145 if ((c.flags_field & Flags.COMPOUND) == 0) {
4146 // First, attribute superclass.
4147 if (st.hasTag(CLASS))
4148 attribClass((ClassSymbol)st.tsym);
4150 // Next attribute owner, if it is a class.
4151 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4152 attribClass((ClassSymbol)c.owner);
4153 }
4155 // The previous operations might have attributed the current class
4156 // if there was a cycle. So we test first whether the class is still
4157 // UNATTRIBUTED.
4158 if ((c.flags_field & UNATTRIBUTED) != 0) {
4159 c.flags_field &= ~UNATTRIBUTED;
4161 // Get environment current at the point of class definition.
4162 Env<AttrContext> env = enter.typeEnvs.get(c);
4164 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4165 // because the annotations were not available at the time the env was created. Therefore,
4166 // we look up the environment chain for the first enclosing environment for which the
4167 // lint value is set. Typically, this is the parent env, but might be further if there
4168 // are any envs created as a result of TypeParameter nodes.
4169 Env<AttrContext> lintEnv = env;
4170 while (lintEnv.info.lint == null)
4171 lintEnv = lintEnv.next;
4173 // Having found the enclosing lint value, we can initialize the lint value for this class
4174 env.info.lint = lintEnv.info.lint.augment(c);
4176 Lint prevLint = chk.setLint(env.info.lint);
4177 JavaFileObject prev = log.useSource(c.sourcefile);
4178 ResultInfo prevReturnRes = env.info.returnResult;
4180 try {
4181 deferredLintHandler.flush(env.tree);
4182 env.info.returnResult = null;
4183 // java.lang.Enum may not be subclassed by a non-enum
4184 if (st.tsym == syms.enumSym &&
4185 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4186 log.error(env.tree.pos(), "enum.no.subclassing");
4188 // Enums may not be extended by source-level classes
4189 if (st.tsym != null &&
4190 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4191 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4192 log.error(env.tree.pos(), "enum.types.not.extensible");
4193 }
4194 attribClassBody(env, c);
4196 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4197 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4198 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4199 } finally {
4200 env.info.returnResult = prevReturnRes;
4201 log.useSource(prev);
4202 chk.setLint(prevLint);
4203 }
4205 }
4206 }
4208 public void visitImport(JCImport tree) {
4209 // nothing to do
4210 }
4212 /** Finish the attribution of a class. */
4213 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4214 JCClassDecl tree = (JCClassDecl)env.tree;
4215 Assert.check(c == tree.sym);
4217 // Validate type parameters, supertype and interfaces.
4218 attribStats(tree.typarams, env);
4219 if (!c.isAnonymous()) {
4220 //already checked if anonymous
4221 chk.validate(tree.typarams, env);
4222 chk.validate(tree.extending, env);
4223 chk.validate(tree.implementing, env);
4224 }
4226 // If this is a non-abstract class, check that it has no abstract
4227 // methods or unimplemented methods of an implemented interface.
4228 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4229 if (!relax)
4230 chk.checkAllDefined(tree.pos(), c);
4231 }
4233 if ((c.flags() & ANNOTATION) != 0) {
4234 if (tree.implementing.nonEmpty())
4235 log.error(tree.implementing.head.pos(),
4236 "cant.extend.intf.annotation");
4237 if (tree.typarams.nonEmpty())
4238 log.error(tree.typarams.head.pos(),
4239 "intf.annotation.cant.have.type.params");
4241 // If this annotation has a @Repeatable, validate
4242 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4243 if (repeatable != null) {
4244 // get diagnostic position for error reporting
4245 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4246 Assert.checkNonNull(cbPos);
4248 chk.validateRepeatable(c, repeatable, cbPos);
4249 }
4250 } else {
4251 // Check that all extended classes and interfaces
4252 // are compatible (i.e. no two define methods with same arguments
4253 // yet different return types). (JLS 8.4.6.3)
4254 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4255 if (allowDefaultMethods) {
4256 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4257 }
4258 }
4260 // Check that class does not import the same parameterized interface
4261 // with two different argument lists.
4262 chk.checkClassBounds(tree.pos(), c.type);
4264 tree.type = c.type;
4266 for (List<JCTypeParameter> l = tree.typarams;
4267 l.nonEmpty(); l = l.tail) {
4268 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4269 }
4271 // Check that a generic class doesn't extend Throwable
4272 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4273 log.error(tree.extending.pos(), "generic.throwable");
4275 // Check that all methods which implement some
4276 // method conform to the method they implement.
4277 chk.checkImplementations(tree);
4279 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4280 checkAutoCloseable(tree.pos(), env, c.type);
4282 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4283 // Attribute declaration
4284 attribStat(l.head, env);
4285 // Check that declarations in inner classes are not static (JLS 8.1.2)
4286 // Make an exception for static constants.
4287 if (c.owner.kind != PCK &&
4288 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4289 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4290 Symbol sym = null;
4291 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4292 if (sym == null ||
4293 sym.kind != VAR ||
4294 ((VarSymbol) sym).getConstValue() == null)
4295 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4296 }
4297 }
4299 // Check for cycles among non-initial constructors.
4300 chk.checkCyclicConstructors(tree);
4302 // Check for cycles among annotation elements.
4303 chk.checkNonCyclicElements(tree);
4305 // Check for proper use of serialVersionUID
4306 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4307 isSerializable(c) &&
4308 (c.flags() & Flags.ENUM) == 0 &&
4309 checkForSerial(c)) {
4310 checkSerialVersionUID(tree, c);
4311 }
4312 if (allowTypeAnnos) {
4313 // Correctly organize the postions of the type annotations
4314 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4316 // Check type annotations applicability rules
4317 validateTypeAnnotations(tree, false);
4318 }
4319 }
4320 // where
4321 boolean checkForSerial(ClassSymbol c) {
4322 if ((c.flags() & ABSTRACT) == 0) {
4323 return true;
4324 } else {
4325 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4326 }
4327 }
4329 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4330 @Override
4331 public boolean accepts(Symbol s) {
4332 return s.kind == Kinds.MTH &&
4333 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4334 }
4335 };
4337 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4338 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4339 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4340 if (types.isSameType(al.head.annotationType.type, t))
4341 return al.head.pos();
4342 }
4344 return null;
4345 }
4347 /** check if a class is a subtype of Serializable, if that is available. */
4348 private boolean isSerializable(ClassSymbol c) {
4349 try {
4350 syms.serializableType.complete();
4351 }
4352 catch (CompletionFailure e) {
4353 return false;
4354 }
4355 return types.isSubtype(c.type, syms.serializableType);
4356 }
4358 /** Check that an appropriate serialVersionUID member is defined. */
4359 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4361 // check for presence of serialVersionUID
4362 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4363 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4364 if (e.scope == null) {
4365 log.warning(LintCategory.SERIAL,
4366 tree.pos(), "missing.SVUID", c);
4367 return;
4368 }
4370 // check that it is static final
4371 VarSymbol svuid = (VarSymbol)e.sym;
4372 if ((svuid.flags() & (STATIC | FINAL)) !=
4373 (STATIC | FINAL))
4374 log.warning(LintCategory.SERIAL,
4375 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4377 // check that it is long
4378 else if (!svuid.type.hasTag(LONG))
4379 log.warning(LintCategory.SERIAL,
4380 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4382 // check constant
4383 else if (svuid.getConstValue() == null)
4384 log.warning(LintCategory.SERIAL,
4385 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4386 }
4388 private Type capture(Type type) {
4389 return types.capture(type);
4390 }
4392 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4393 tree.accept(new TypeAnnotationsValidator(sigOnly));
4394 }
4395 //where
4396 private final class TypeAnnotationsValidator extends TreeScanner {
4398 private final boolean sigOnly;
4399 public TypeAnnotationsValidator(boolean sigOnly) {
4400 this.sigOnly = sigOnly;
4401 }
4403 public void visitAnnotation(JCAnnotation tree) {
4404 chk.validateTypeAnnotation(tree, false);
4405 super.visitAnnotation(tree);
4406 }
4407 public void visitAnnotatedType(JCAnnotatedType tree) {
4408 if (!tree.underlyingType.type.isErroneous()) {
4409 super.visitAnnotatedType(tree);
4410 }
4411 }
4412 public void visitTypeParameter(JCTypeParameter tree) {
4413 chk.validateTypeAnnotations(tree.annotations, true);
4414 scan(tree.bounds);
4415 // Don't call super.
4416 // This is needed because above we call validateTypeAnnotation with
4417 // false, which would forbid annotations on type parameters.
4418 // super.visitTypeParameter(tree);
4419 }
4420 public void visitMethodDef(JCMethodDecl tree) {
4421 if (tree.recvparam != null &&
4422 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4423 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4424 tree.recvparam.vartype.type.tsym);
4425 }
4426 if (tree.restype != null && tree.restype.type != null) {
4427 validateAnnotatedType(tree.restype, tree.restype.type);
4428 }
4429 if (sigOnly) {
4430 scan(tree.mods);
4431 scan(tree.restype);
4432 scan(tree.typarams);
4433 scan(tree.recvparam);
4434 scan(tree.params);
4435 scan(tree.thrown);
4436 } else {
4437 scan(tree.defaultValue);
4438 scan(tree.body);
4439 }
4440 }
4441 public void visitVarDef(final JCVariableDecl tree) {
4442 if (tree.sym != null && tree.sym.type != null)
4443 validateAnnotatedType(tree.vartype, tree.sym.type);
4444 scan(tree.mods);
4445 scan(tree.vartype);
4446 if (!sigOnly) {
4447 scan(tree.init);
4448 }
4449 }
4450 public void visitTypeCast(JCTypeCast tree) {
4451 if (tree.clazz != null && tree.clazz.type != null)
4452 validateAnnotatedType(tree.clazz, tree.clazz.type);
4453 super.visitTypeCast(tree);
4454 }
4455 public void visitTypeTest(JCInstanceOf tree) {
4456 if (tree.clazz != null && tree.clazz.type != null)
4457 validateAnnotatedType(tree.clazz, tree.clazz.type);
4458 super.visitTypeTest(tree);
4459 }
4460 public void visitNewClass(JCNewClass tree) {
4461 if (tree.clazz.type != null)
4462 validateAnnotatedType(tree.clazz, tree.clazz.type);
4463 super.visitNewClass(tree);
4464 }
4465 public void visitNewArray(JCNewArray tree) {
4466 if (tree.elemtype != null && tree.elemtype.type != null)
4467 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4468 super.visitNewArray(tree);
4469 }
4471 @Override
4472 public void visitClassDef(JCClassDecl tree) {
4473 if (sigOnly) {
4474 scan(tree.mods);
4475 scan(tree.typarams);
4476 scan(tree.extending);
4477 scan(tree.implementing);
4478 }
4479 for (JCTree member : tree.defs) {
4480 if (member.hasTag(Tag.CLASSDEF)) {
4481 continue;
4482 }
4483 scan(member);
4484 }
4485 }
4487 @Override
4488 public void visitBlock(JCBlock tree) {
4489 if (!sigOnly) {
4490 scan(tree.stats);
4491 }
4492 }
4494 /* I would want to model this after
4495 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4496 * and override visitSelect and visitTypeApply.
4497 * However, we only set the annotated type in the top-level type
4498 * of the symbol.
4499 * Therefore, we need to override each individual location where a type
4500 * can occur.
4501 */
4502 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4503 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4505 if (type.isPrimitiveOrVoid()) {
4506 return;
4507 }
4509 JCTree enclTr = errtree;
4510 Type enclTy = type;
4512 boolean repeat = true;
4513 while (repeat) {
4514 if (enclTr.hasTag(TYPEAPPLY)) {
4515 List<Type> tyargs = enclTy.getTypeArguments();
4516 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4517 if (trargs.length() > 0) {
4518 // Nothing to do for diamonds
4519 if (tyargs.length() == trargs.length()) {
4520 for (int i = 0; i < tyargs.length(); ++i) {
4521 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4522 }
4523 }
4524 // If the lengths don't match, it's either a diamond
4525 // or some nested type that redundantly provides
4526 // type arguments in the tree.
4527 }
4529 // Look at the clazz part of a generic type
4530 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4531 }
4533 if (enclTr.hasTag(SELECT)) {
4534 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4535 if (enclTy != null &&
4536 !enclTy.hasTag(NONE)) {
4537 enclTy = enclTy.getEnclosingType();
4538 }
4539 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4540 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4541 if (enclTy == null ||
4542 enclTy.hasTag(NONE)) {
4543 if (at.getAnnotations().size() == 1) {
4544 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4545 } else {
4546 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4547 for (JCAnnotation an : at.getAnnotations()) {
4548 comps.add(an.attribute);
4549 }
4550 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4551 }
4552 repeat = false;
4553 }
4554 enclTr = at.underlyingType;
4555 // enclTy doesn't need to be changed
4556 } else if (enclTr.hasTag(IDENT)) {
4557 repeat = false;
4558 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4559 JCWildcard wc = (JCWildcard) enclTr;
4560 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4561 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4562 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4563 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4564 } else {
4565 // Nothing to do for UNBOUND
4566 }
4567 repeat = false;
4568 } else if (enclTr.hasTag(TYPEARRAY)) {
4569 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4570 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4571 repeat = false;
4572 } else if (enclTr.hasTag(TYPEUNION)) {
4573 JCTypeUnion ut = (JCTypeUnion) enclTr;
4574 for (JCTree t : ut.getTypeAlternatives()) {
4575 validateAnnotatedType(t, t.type);
4576 }
4577 repeat = false;
4578 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4579 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4580 for (JCTree t : it.getBounds()) {
4581 validateAnnotatedType(t, t.type);
4582 }
4583 repeat = false;
4584 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4585 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4586 repeat = false;
4587 } else {
4588 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4589 " within: "+ errtree + " with kind: " + errtree.getKind());
4590 }
4591 }
4592 }
4593 };
4595 // <editor-fold desc="post-attribution visitor">
4597 /**
4598 * Handle missing types/symbols in an AST. This routine is useful when
4599 * the compiler has encountered some errors (which might have ended up
4600 * terminating attribution abruptly); if the compiler is used in fail-over
4601 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4602 * prevents NPE to be progagated during subsequent compilation steps.
4603 */
4604 public void postAttr(JCTree tree) {
4605 new PostAttrAnalyzer().scan(tree);
4606 }
4608 class PostAttrAnalyzer extends TreeScanner {
4610 private void initTypeIfNeeded(JCTree that) {
4611 if (that.type == null) {
4612 that.type = syms.unknownType;
4613 }
4614 }
4616 @Override
4617 public void scan(JCTree tree) {
4618 if (tree == null) return;
4619 if (tree instanceof JCExpression) {
4620 initTypeIfNeeded(tree);
4621 }
4622 super.scan(tree);
4623 }
4625 @Override
4626 public void visitIdent(JCIdent that) {
4627 if (that.sym == null) {
4628 that.sym = syms.unknownSymbol;
4629 }
4630 }
4632 @Override
4633 public void visitSelect(JCFieldAccess that) {
4634 if (that.sym == null) {
4635 that.sym = syms.unknownSymbol;
4636 }
4637 super.visitSelect(that);
4638 }
4640 @Override
4641 public void visitClassDef(JCClassDecl that) {
4642 initTypeIfNeeded(that);
4643 if (that.sym == null) {
4644 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4645 }
4646 super.visitClassDef(that);
4647 }
4649 @Override
4650 public void visitMethodDef(JCMethodDecl that) {
4651 initTypeIfNeeded(that);
4652 if (that.sym == null) {
4653 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4654 }
4655 super.visitMethodDef(that);
4656 }
4658 @Override
4659 public void visitVarDef(JCVariableDecl that) {
4660 initTypeIfNeeded(that);
4661 if (that.sym == null) {
4662 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4663 that.sym.adr = 0;
4664 }
4665 super.visitVarDef(that);
4666 }
4668 @Override
4669 public void visitNewClass(JCNewClass that) {
4670 if (that.constructor == null) {
4671 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4672 }
4673 if (that.constructorType == null) {
4674 that.constructorType = syms.unknownType;
4675 }
4676 super.visitNewClass(that);
4677 }
4679 @Override
4680 public void visitAssignop(JCAssignOp that) {
4681 if (that.operator == null)
4682 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4683 super.visitAssignop(that);
4684 }
4686 @Override
4687 public void visitBinary(JCBinary that) {
4688 if (that.operator == null)
4689 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4690 super.visitBinary(that);
4691 }
4693 @Override
4694 public void visitUnary(JCUnary that) {
4695 if (that.operator == null)
4696 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4697 super.visitUnary(that);
4698 }
4700 @Override
4701 public void visitLambda(JCLambda that) {
4702 super.visitLambda(that);
4703 if (that.targets == null) {
4704 that.targets = List.nil();
4705 }
4706 }
4708 @Override
4709 public void visitReference(JCMemberReference that) {
4710 super.visitReference(that);
4711 if (that.sym == null) {
4712 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4713 }
4714 if (that.targets == null) {
4715 that.targets = List.nil();
4716 }
4717 }
4718 }
4719 // </editor-fold>
4720 }
