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src/share/classes/com/sun/tools/javac/comp/Attr.java@ca5783d9a597
src/share/classes/com/sun/tools/javac/comp/Attr.java
Mon, 16 Oct 2017 16:07:48 +0800
- author
- aoqi
- date
- Mon, 16 Oct 2017 16:07:48 +0800
- changeset 2893
- ca5783d9a597
- parent 2814
- 380f6c17ea01
- parent 2702
- 9ca8d8713094
- child 3295
- 859dc787b52b
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merge
1 /*
2 * Copyright (c) 1999, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.tools.JavaFileObject;
33 import com.sun.source.tree.IdentifierTree;
34 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
35 import com.sun.source.tree.MemberSelectTree;
36 import com.sun.source.tree.TreeVisitor;
37 import com.sun.source.util.SimpleTreeVisitor;
38 import com.sun.tools.javac.code.*;
39 import com.sun.tools.javac.code.Lint.LintCategory;
40 import com.sun.tools.javac.code.Symbol.*;
41 import com.sun.tools.javac.code.Type.*;
42 import com.sun.tools.javac.comp.Check.CheckContext;
43 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
44 import com.sun.tools.javac.comp.Infer.InferenceContext;
45 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
46 import com.sun.tools.javac.jvm.*;
47 import com.sun.tools.javac.tree.*;
48 import com.sun.tools.javac.tree.JCTree.*;
49 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
50 import com.sun.tools.javac.util.*;
51 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
52 import com.sun.tools.javac.util.List;
53 import static com.sun.tools.javac.code.Flags.*;
54 import static com.sun.tools.javac.code.Flags.ANNOTATION;
55 import static com.sun.tools.javac.code.Flags.BLOCK;
56 import static com.sun.tools.javac.code.Kinds.*;
57 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
58 import static com.sun.tools.javac.code.TypeTag.*;
59 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
60 import static com.sun.tools.javac.tree.JCTree.Tag.*;
62 /** This is the main context-dependent analysis phase in GJC. It
63 * encompasses name resolution, type checking and constant folding as
64 * subtasks. Some subtasks involve auxiliary classes.
65 * @see Check
66 * @see Resolve
67 * @see ConstFold
68 * @see Infer
69 *
70 * <p><b>This is NOT part of any supported API.
71 * If you write code that depends on this, you do so at your own risk.
72 * This code and its internal interfaces are subject to change or
73 * deletion without notice.</b>
74 */
75 public class Attr extends JCTree.Visitor {
76 protected static final Context.Key<Attr> attrKey =
77 new Context.Key<Attr>();
79 final Names names;
80 final Log log;
81 final Symtab syms;
82 final Resolve rs;
83 final Infer infer;
84 final DeferredAttr deferredAttr;
85 final Check chk;
86 final Flow flow;
87 final MemberEnter memberEnter;
88 final TreeMaker make;
89 final ConstFold cfolder;
90 final Enter enter;
91 final Target target;
92 final Types types;
93 final JCDiagnostic.Factory diags;
94 final Annotate annotate;
95 final TypeAnnotations typeAnnotations;
96 final DeferredLintHandler deferredLintHandler;
97 final TypeEnvs typeEnvs;
99 public static Attr instance(Context context) {
100 Attr instance = context.get(attrKey);
101 if (instance == null)
102 instance = new Attr(context);
103 return instance;
104 }
106 protected Attr(Context context) {
107 context.put(attrKey, this);
109 names = Names.instance(context);
110 log = Log.instance(context);
111 syms = Symtab.instance(context);
112 rs = Resolve.instance(context);
113 chk = Check.instance(context);
114 flow = Flow.instance(context);
115 memberEnter = MemberEnter.instance(context);
116 make = TreeMaker.instance(context);
117 enter = Enter.instance(context);
118 infer = Infer.instance(context);
119 deferredAttr = DeferredAttr.instance(context);
120 cfolder = ConstFold.instance(context);
121 target = Target.instance(context);
122 types = Types.instance(context);
123 diags = JCDiagnostic.Factory.instance(context);
124 annotate = Annotate.instance(context);
125 typeAnnotations = TypeAnnotations.instance(context);
126 deferredLintHandler = DeferredLintHandler.instance(context);
127 typeEnvs = TypeEnvs.instance(context);
129 Options options = Options.instance(context);
131 Source source = Source.instance(context);
132 allowGenerics = source.allowGenerics();
133 allowVarargs = source.allowVarargs();
134 allowEnums = source.allowEnums();
135 allowBoxing = source.allowBoxing();
136 allowCovariantReturns = source.allowCovariantReturns();
137 allowAnonOuterThis = source.allowAnonOuterThis();
138 allowStringsInSwitch = source.allowStringsInSwitch();
139 allowPoly = source.allowPoly();
140 allowTypeAnnos = source.allowTypeAnnotations();
141 allowLambda = source.allowLambda();
142 allowDefaultMethods = source.allowDefaultMethods();
143 allowStaticInterfaceMethods = source.allowStaticInterfaceMethods();
144 sourceName = source.name;
145 relax = (options.isSet("-retrofit") ||
146 options.isSet("-relax"));
147 findDiamonds = options.get("findDiamond") != null &&
148 source.allowDiamond();
149 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
150 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
152 statInfo = new ResultInfo(NIL, Type.noType);
153 varInfo = new ResultInfo(VAR, Type.noType);
154 unknownExprInfo = new ResultInfo(VAL, Type.noType);
155 unknownAnyPolyInfo = new ResultInfo(VAL, Infer.anyPoly);
156 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
157 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
158 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
159 }
161 /** Switch: relax some constraints for retrofit mode.
162 */
163 boolean relax;
165 /** Switch: support target-typing inference
166 */
167 boolean allowPoly;
169 /** Switch: support type annotations.
170 */
171 boolean allowTypeAnnos;
173 /** Switch: support generics?
174 */
175 boolean allowGenerics;
177 /** Switch: allow variable-arity methods.
178 */
179 boolean allowVarargs;
181 /** Switch: support enums?
182 */
183 boolean allowEnums;
185 /** Switch: support boxing and unboxing?
186 */
187 boolean allowBoxing;
189 /** Switch: support covariant result types?
190 */
191 boolean allowCovariantReturns;
193 /** Switch: support lambda expressions ?
194 */
195 boolean allowLambda;
197 /** Switch: support default methods ?
198 */
199 boolean allowDefaultMethods;
201 /** Switch: static interface methods enabled?
202 */
203 boolean allowStaticInterfaceMethods;
205 /** Switch: allow references to surrounding object from anonymous
206 * objects during constructor call?
207 */
208 boolean allowAnonOuterThis;
210 /** Switch: generates a warning if diamond can be safely applied
211 * to a given new expression
212 */
213 boolean findDiamonds;
215 /**
216 * Internally enables/disables diamond finder feature
217 */
218 static final boolean allowDiamondFinder = true;
220 /**
221 * Switch: warn about use of variable before declaration?
222 * RFE: 6425594
223 */
224 boolean useBeforeDeclarationWarning;
226 /**
227 * Switch: generate warnings whenever an anonymous inner class that is convertible
228 * to a lambda expression is found
229 */
230 boolean identifyLambdaCandidate;
232 /**
233 * Switch: allow strings in switch?
234 */
235 boolean allowStringsInSwitch;
237 /**
238 * Switch: name of source level; used for error reporting.
239 */
240 String sourceName;
242 /** Check kind and type of given tree against protokind and prototype.
243 * If check succeeds, store type in tree and return it.
244 * If check fails, store errType in tree and return it.
245 * No checks are performed if the prototype is a method type.
246 * It is not necessary in this case since we know that kind and type
247 * are correct.
248 *
249 * @param tree The tree whose kind and type is checked
250 * @param ownkind The computed kind of the tree
251 * @param resultInfo The expected result of the tree
252 */
253 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
254 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
255 Type owntype;
256 if (!found.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
257 if ((ownkind & ~resultInfo.pkind) != 0) {
258 log.error(tree.pos(), "unexpected.type",
259 kindNames(resultInfo.pkind),
260 kindName(ownkind));
261 owntype = types.createErrorType(found);
262 } else if (allowPoly && inferenceContext.free(found)) {
263 //delay the check if there are inference variables in the found type
264 //this means we are dealing with a partially inferred poly expression
265 owntype = resultInfo.pt;
266 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
267 @Override
268 public void typesInferred(InferenceContext inferenceContext) {
269 ResultInfo pendingResult =
270 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
271 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
272 }
273 });
274 } else {
275 owntype = resultInfo.check(tree, found);
276 }
277 } else {
278 owntype = found;
279 }
280 tree.type = owntype;
281 return owntype;
282 }
284 /** Is given blank final variable assignable, i.e. in a scope where it
285 * may be assigned to even though it is final?
286 * @param v The blank final variable.
287 * @param env The current environment.
288 */
289 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
290 Symbol owner = env.info.scope.owner;
291 // owner refers to the innermost variable, method or
292 // initializer block declaration at this point.
293 return
294 v.owner == owner
295 ||
296 ((owner.name == names.init || // i.e. we are in a constructor
297 owner.kind == VAR || // i.e. we are in a variable initializer
298 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
299 &&
300 v.owner == owner.owner
301 &&
302 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
303 }
305 /** Check that variable can be assigned to.
306 * @param pos The current source code position.
307 * @param v The assigned varaible
308 * @param base If the variable is referred to in a Select, the part
309 * to the left of the `.', null otherwise.
310 * @param env The current environment.
311 */
312 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
313 if ((v.flags() & FINAL) != 0 &&
314 ((v.flags() & HASINIT) != 0
315 ||
316 !((base == null ||
317 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
318 isAssignableAsBlankFinal(v, env)))) {
319 if (v.isResourceVariable()) { //TWR resource
320 log.error(pos, "try.resource.may.not.be.assigned", v);
321 } else {
322 log.error(pos, "cant.assign.val.to.final.var", v);
323 }
324 }
325 }
327 /** Does tree represent a static reference to an identifier?
328 * It is assumed that tree is either a SELECT or an IDENT.
329 * We have to weed out selects from non-type names here.
330 * @param tree The candidate tree.
331 */
332 boolean isStaticReference(JCTree tree) {
333 if (tree.hasTag(SELECT)) {
334 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
335 if (lsym == null || lsym.kind != TYP) {
336 return false;
337 }
338 }
339 return true;
340 }
342 /** Is this symbol a type?
343 */
344 static boolean isType(Symbol sym) {
345 return sym != null && sym.kind == TYP;
346 }
348 /** The current `this' symbol.
349 * @param env The current environment.
350 */
351 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
352 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
353 }
355 /** Attribute a parsed identifier.
356 * @param tree Parsed identifier name
357 * @param topLevel The toplevel to use
358 */
359 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
360 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
361 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
362 syms.errSymbol.name,
363 null, null, null, null);
364 localEnv.enclClass.sym = syms.errSymbol;
365 return tree.accept(identAttributer, localEnv);
366 }
367 // where
368 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
369 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
370 @Override
371 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
372 Symbol site = visit(node.getExpression(), env);
373 if (site.kind == ERR || site.kind == ABSENT_TYP)
374 return site;
375 Name name = (Name)node.getIdentifier();
376 if (site.kind == PCK) {
377 env.toplevel.packge = (PackageSymbol)site;
378 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
379 } else {
380 env.enclClass.sym = (ClassSymbol)site;
381 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
382 }
383 }
385 @Override
386 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
387 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
388 }
389 }
391 public Type coerce(Type etype, Type ttype) {
392 return cfolder.coerce(etype, ttype);
393 }
395 public Type attribType(JCTree node, TypeSymbol sym) {
396 Env<AttrContext> env = typeEnvs.get(sym);
397 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
398 return attribTree(node, localEnv, unknownTypeInfo);
399 }
401 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
402 // Attribute qualifying package or class.
403 JCFieldAccess s = (JCFieldAccess)tree.qualid;
404 return attribTree(s.selected,
405 env,
406 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
407 Type.noType));
408 }
410 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
411 breakTree = tree;
412 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
413 try {
414 attribExpr(expr, env);
415 } catch (BreakAttr b) {
416 return b.env;
417 } catch (AssertionError ae) {
418 if (ae.getCause() instanceof BreakAttr) {
419 return ((BreakAttr)(ae.getCause())).env;
420 } else {
421 throw ae;
422 }
423 } finally {
424 breakTree = null;
425 log.useSource(prev);
426 }
427 return env;
428 }
430 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
431 breakTree = tree;
432 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
433 try {
434 attribStat(stmt, env);
435 } catch (BreakAttr b) {
436 return b.env;
437 } catch (AssertionError ae) {
438 if (ae.getCause() instanceof BreakAttr) {
439 return ((BreakAttr)(ae.getCause())).env;
440 } else {
441 throw ae;
442 }
443 } finally {
444 breakTree = null;
445 log.useSource(prev);
446 }
447 return env;
448 }
450 private JCTree breakTree = null;
452 private static class BreakAttr extends RuntimeException {
453 static final long serialVersionUID = -6924771130405446405L;
454 private Env<AttrContext> env;
455 private BreakAttr(Env<AttrContext> env) {
456 this.env = env;
457 }
458 }
460 class ResultInfo {
461 final int pkind;
462 final Type pt;
463 final CheckContext checkContext;
465 ResultInfo(int pkind, Type pt) {
466 this(pkind, pt, chk.basicHandler);
467 }
469 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
470 this.pkind = pkind;
471 this.pt = pt;
472 this.checkContext = checkContext;
473 }
475 protected Type check(final DiagnosticPosition pos, final Type found) {
476 return chk.checkType(pos, found, pt, checkContext);
477 }
479 protected ResultInfo dup(Type newPt) {
480 return new ResultInfo(pkind, newPt, checkContext);
481 }
483 protected ResultInfo dup(CheckContext newContext) {
484 return new ResultInfo(pkind, pt, newContext);
485 }
487 protected ResultInfo dup(Type newPt, CheckContext newContext) {
488 return new ResultInfo(pkind, newPt, newContext);
489 }
491 @Override
492 public String toString() {
493 if (pt != null) {
494 return pt.toString();
495 } else {
496 return "";
497 }
498 }
499 }
501 class RecoveryInfo extends ResultInfo {
503 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
504 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
505 @Override
506 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
507 return deferredAttrContext;
508 }
509 @Override
510 public boolean compatible(Type found, Type req, Warner warn) {
511 return true;
512 }
513 @Override
514 public void report(DiagnosticPosition pos, JCDiagnostic details) {
515 chk.basicHandler.report(pos, details);
516 }
517 });
518 }
519 }
521 final ResultInfo statInfo;
522 final ResultInfo varInfo;
523 final ResultInfo unknownAnyPolyInfo;
524 final ResultInfo unknownExprInfo;
525 final ResultInfo unknownTypeInfo;
526 final ResultInfo unknownTypeExprInfo;
527 final ResultInfo recoveryInfo;
529 Type pt() {
530 return resultInfo.pt;
531 }
533 int pkind() {
534 return resultInfo.pkind;
535 }
537 /* ************************************************************************
538 * Visitor methods
539 *************************************************************************/
541 /** Visitor argument: the current environment.
542 */
543 Env<AttrContext> env;
545 /** Visitor argument: the currently expected attribution result.
546 */
547 ResultInfo resultInfo;
549 /** Visitor result: the computed type.
550 */
551 Type result;
553 /** Visitor method: attribute a tree, catching any completion failure
554 * exceptions. Return the tree's type.
555 *
556 * @param tree The tree to be visited.
557 * @param env The environment visitor argument.
558 * @param resultInfo The result info visitor argument.
559 */
560 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
561 Env<AttrContext> prevEnv = this.env;
562 ResultInfo prevResult = this.resultInfo;
563 try {
564 this.env = env;
565 this.resultInfo = resultInfo;
566 tree.accept(this);
567 if (tree == breakTree &&
568 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
569 throw new BreakAttr(copyEnv(env));
570 }
571 return result;
572 } catch (CompletionFailure ex) {
573 tree.type = syms.errType;
574 return chk.completionError(tree.pos(), ex);
575 } finally {
576 this.env = prevEnv;
577 this.resultInfo = prevResult;
578 }
579 }
581 Env<AttrContext> copyEnv(Env<AttrContext> env) {
582 Env<AttrContext> newEnv =
583 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
584 if (newEnv.outer != null) {
585 newEnv.outer = copyEnv(newEnv.outer);
586 }
587 return newEnv;
588 }
590 Scope copyScope(Scope sc) {
591 Scope newScope = new Scope(sc.owner);
592 List<Symbol> elemsList = List.nil();
593 while (sc != null) {
594 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
595 elemsList = elemsList.prepend(e.sym);
596 }
597 sc = sc.next;
598 }
599 for (Symbol s : elemsList) {
600 newScope.enter(s);
601 }
602 return newScope;
603 }
605 /** Derived visitor method: attribute an expression tree.
606 */
607 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
608 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
609 }
611 /** Derived visitor method: attribute an expression tree with
612 * no constraints on the computed type.
613 */
614 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
615 return attribTree(tree, env, unknownExprInfo);
616 }
618 /** Derived visitor method: attribute a type tree.
619 */
620 public Type attribType(JCTree tree, Env<AttrContext> env) {
621 Type result = attribType(tree, env, Type.noType);
622 return result;
623 }
625 /** Derived visitor method: attribute a type tree.
626 */
627 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
628 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
629 return result;
630 }
632 /** Derived visitor method: attribute a statement or definition tree.
633 */
634 public Type attribStat(JCTree tree, Env<AttrContext> env) {
635 return attribTree(tree, env, statInfo);
636 }
638 /** Attribute a list of expressions, returning a list of types.
639 */
640 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
641 ListBuffer<Type> ts = new ListBuffer<Type>();
642 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
643 ts.append(attribExpr(l.head, env, pt));
644 return ts.toList();
645 }
647 /** Attribute a list of statements, returning nothing.
648 */
649 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
650 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
651 attribStat(l.head, env);
652 }
654 /** Attribute the arguments in a method call, returning the method kind.
655 */
656 int attribArgs(List<JCExpression> trees, Env<AttrContext> env, ListBuffer<Type> argtypes) {
657 int kind = VAL;
658 for (JCExpression arg : trees) {
659 Type argtype;
660 if (allowPoly && deferredAttr.isDeferred(env, arg)) {
661 argtype = deferredAttr.new DeferredType(arg, env);
662 kind |= POLY;
663 } else {
664 argtype = chk.checkNonVoid(arg, attribTree(arg, env, unknownAnyPolyInfo));
665 }
666 argtypes.append(argtype);
667 }
668 return kind;
669 }
671 /** Attribute a type argument list, returning a list of types.
672 * Caller is responsible for calling checkRefTypes.
673 */
674 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
675 ListBuffer<Type> argtypes = new ListBuffer<Type>();
676 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
677 argtypes.append(attribType(l.head, env));
678 return argtypes.toList();
679 }
681 /** Attribute a type argument list, returning a list of types.
682 * Check that all the types are references.
683 */
684 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
685 List<Type> types = attribAnyTypes(trees, env);
686 return chk.checkRefTypes(trees, types);
687 }
689 /**
690 * Attribute type variables (of generic classes or methods).
691 * Compound types are attributed later in attribBounds.
692 * @param typarams the type variables to enter
693 * @param env the current environment
694 */
695 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
696 for (JCTypeParameter tvar : typarams) {
697 TypeVar a = (TypeVar)tvar.type;
698 a.tsym.flags_field |= UNATTRIBUTED;
699 a.bound = Type.noType;
700 if (!tvar.bounds.isEmpty()) {
701 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
702 for (JCExpression bound : tvar.bounds.tail)
703 bounds = bounds.prepend(attribType(bound, env));
704 types.setBounds(a, bounds.reverse());
705 } else {
706 // if no bounds are given, assume a single bound of
707 // java.lang.Object.
708 types.setBounds(a, List.of(syms.objectType));
709 }
710 a.tsym.flags_field &= ~UNATTRIBUTED;
711 }
712 for (JCTypeParameter tvar : typarams) {
713 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
714 }
715 }
717 /**
718 * Attribute the type references in a list of annotations.
719 */
720 void attribAnnotationTypes(List<JCAnnotation> annotations,
721 Env<AttrContext> env) {
722 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
723 JCAnnotation a = al.head;
724 attribType(a.annotationType, env);
725 }
726 }
728 /**
729 * Attribute a "lazy constant value".
730 * @param env The env for the const value
731 * @param initializer The initializer for the const value
732 * @param type The expected type, or null
733 * @see VarSymbol#setLazyConstValue
734 */
735 public Object attribLazyConstantValue(Env<AttrContext> env,
736 JCVariableDecl variable,
737 Type type) {
739 DiagnosticPosition prevLintPos
740 = deferredLintHandler.setPos(variable.pos());
742 try {
743 // Use null as symbol to not attach the type annotation to any symbol.
744 // The initializer will later also be visited and then we'll attach
745 // to the symbol.
746 // This prevents having multiple type annotations, just because of
747 // lazy constant value evaluation.
748 memberEnter.typeAnnotate(variable.init, env, null, variable.pos());
749 annotate.flush();
750 Type itype = attribExpr(variable.init, env, type);
751 if (itype.constValue() != null) {
752 return coerce(itype, type).constValue();
753 } else {
754 return null;
755 }
756 } finally {
757 deferredLintHandler.setPos(prevLintPos);
758 }
759 }
761 /** Attribute type reference in an `extends' or `implements' clause.
762 * Supertypes of anonymous inner classes are usually already attributed.
763 *
764 * @param tree The tree making up the type reference.
765 * @param env The environment current at the reference.
766 * @param classExpected true if only a class is expected here.
767 * @param interfaceExpected true if only an interface is expected here.
768 */
769 Type attribBase(JCTree tree,
770 Env<AttrContext> env,
771 boolean classExpected,
772 boolean interfaceExpected,
773 boolean checkExtensible) {
774 Type t = tree.type != null ?
775 tree.type :
776 attribType(tree, env);
777 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
778 }
779 Type checkBase(Type t,
780 JCTree tree,
781 Env<AttrContext> env,
782 boolean classExpected,
783 boolean interfaceExpected,
784 boolean checkExtensible) {
785 if (t.tsym.isAnonymous()) {
786 log.error(tree.pos(), "cant.inherit.from.anon");
787 return types.createErrorType(t);
788 }
789 if (t.isErroneous())
790 return t;
791 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
792 // check that type variable is already visible
793 if (t.getUpperBound() == null) {
794 log.error(tree.pos(), "illegal.forward.ref");
795 return types.createErrorType(t);
796 }
797 } else {
798 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
799 }
800 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
801 log.error(tree.pos(), "intf.expected.here");
802 // return errType is necessary since otherwise there might
803 // be undetected cycles which cause attribution to loop
804 return types.createErrorType(t);
805 } else if (checkExtensible &&
806 classExpected &&
807 (t.tsym.flags() & INTERFACE) != 0) {
808 log.error(tree.pos(), "no.intf.expected.here");
809 return types.createErrorType(t);
810 }
811 if (checkExtensible &&
812 ((t.tsym.flags() & FINAL) != 0)) {
813 log.error(tree.pos(),
814 "cant.inherit.from.final", t.tsym);
815 }
816 chk.checkNonCyclic(tree.pos(), t);
817 return t;
818 }
820 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
821 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
822 id.type = env.info.scope.owner.type;
823 id.sym = env.info.scope.owner;
824 return id.type;
825 }
827 public void visitClassDef(JCClassDecl tree) {
828 // Local and anonymous classes have not been entered yet, so we need to
829 // do it now.
830 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0) {
831 enter.classEnter(tree, env);
832 } else {
833 // If this class declaration is part of a class level annotation,
834 // as in @MyAnno(new Object() {}) class MyClass {}, enter it in
835 // order to simplify later steps and allow for sensible error
836 // messages.
837 if (env.tree.hasTag(NEWCLASS) && TreeInfo.isInAnnotation(env, tree))
838 enter.classEnter(tree, env);
839 }
841 ClassSymbol c = tree.sym;
842 if (c == null) {
843 // exit in case something drastic went wrong during enter.
844 result = null;
845 } else {
846 // make sure class has been completed:
847 c.complete();
849 // If this class appears as an anonymous class
850 // in a superclass constructor call where
851 // no explicit outer instance is given,
852 // disable implicit outer instance from being passed.
853 // (This would be an illegal access to "this before super").
854 if (env.info.isSelfCall &&
855 env.tree.hasTag(NEWCLASS) &&
856 ((JCNewClass) env.tree).encl == null)
857 {
858 c.flags_field |= NOOUTERTHIS;
859 }
860 attribClass(tree.pos(), c);
861 result = tree.type = c.type;
862 }
863 }
865 public void visitMethodDef(JCMethodDecl tree) {
866 MethodSymbol m = tree.sym;
867 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
869 Lint lint = env.info.lint.augment(m);
870 Lint prevLint = chk.setLint(lint);
871 MethodSymbol prevMethod = chk.setMethod(m);
872 try {
873 deferredLintHandler.flush(tree.pos());
874 chk.checkDeprecatedAnnotation(tree.pos(), m);
877 // Create a new environment with local scope
878 // for attributing the method.
879 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
880 localEnv.info.lint = lint;
882 attribStats(tree.typarams, localEnv);
884 // If we override any other methods, check that we do so properly.
885 // JLS ???
886 if (m.isStatic()) {
887 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
888 } else {
889 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
890 }
891 chk.checkOverride(tree, m);
893 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
894 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
895 }
897 // Enter all type parameters into the local method scope.
898 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
899 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
901 ClassSymbol owner = env.enclClass.sym;
902 if ((owner.flags() & ANNOTATION) != 0 &&
903 tree.params.nonEmpty())
904 log.error(tree.params.head.pos(),
905 "intf.annotation.members.cant.have.params");
907 // Attribute all value parameters.
908 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
909 attribStat(l.head, localEnv);
910 }
912 chk.checkVarargsMethodDecl(localEnv, tree);
914 // Check that type parameters are well-formed.
915 chk.validate(tree.typarams, localEnv);
917 // Check that result type is well-formed.
918 if (tree.restype != null && !tree.restype.type.hasTag(VOID))
919 chk.validate(tree.restype, localEnv);
921 // Check that receiver type is well-formed.
922 if (tree.recvparam != null) {
923 // Use a new environment to check the receiver parameter.
924 // Otherwise I get "might not have been initialized" errors.
925 // Is there a better way?
926 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
927 attribType(tree.recvparam, newEnv);
928 chk.validate(tree.recvparam, newEnv);
929 }
931 // annotation method checks
932 if ((owner.flags() & ANNOTATION) != 0) {
933 // annotation method cannot have throws clause
934 if (tree.thrown.nonEmpty()) {
935 log.error(tree.thrown.head.pos(),
936 "throws.not.allowed.in.intf.annotation");
937 }
938 // annotation method cannot declare type-parameters
939 if (tree.typarams.nonEmpty()) {
940 log.error(tree.typarams.head.pos(),
941 "intf.annotation.members.cant.have.type.params");
942 }
943 // validate annotation method's return type (could be an annotation type)
944 chk.validateAnnotationType(tree.restype);
945 // ensure that annotation method does not clash with members of Object/Annotation
946 chk.validateAnnotationMethod(tree.pos(), m);
947 }
949 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
950 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
952 if (tree.body == null) {
953 // Empty bodies are only allowed for
954 // abstract, native, or interface methods, or for methods
955 // in a retrofit signature class.
956 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
957 !relax)
958 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
959 if (tree.defaultValue != null) {
960 if ((owner.flags() & ANNOTATION) == 0)
961 log.error(tree.pos(),
962 "default.allowed.in.intf.annotation.member");
963 }
964 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
965 if ((owner.flags() & INTERFACE) != 0) {
966 log.error(tree.body.pos(), "intf.meth.cant.have.body");
967 } else {
968 log.error(tree.pos(), "abstract.meth.cant.have.body");
969 }
970 } else if ((tree.mods.flags & NATIVE) != 0) {
971 log.error(tree.pos(), "native.meth.cant.have.body");
972 } else {
973 // Add an implicit super() call unless an explicit call to
974 // super(...) or this(...) is given
975 // or we are compiling class java.lang.Object.
976 if (tree.name == names.init && owner.type != syms.objectType) {
977 JCBlock body = tree.body;
978 if (body.stats.isEmpty() ||
979 !TreeInfo.isSelfCall(body.stats.head)) {
980 body.stats = body.stats.
981 prepend(memberEnter.SuperCall(make.at(body.pos),
982 List.<Type>nil(),
983 List.<JCVariableDecl>nil(),
984 false));
985 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
986 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
987 TreeInfo.isSuperCall(body.stats.head)) {
988 // enum constructors are not allowed to call super
989 // directly, so make sure there aren't any super calls
990 // in enum constructors, except in the compiler
991 // generated one.
992 log.error(tree.body.stats.head.pos(),
993 "call.to.super.not.allowed.in.enum.ctor",
994 env.enclClass.sym);
995 }
996 }
998 // Attribute all type annotations in the body
999 memberEnter.typeAnnotate(tree.body, localEnv, m, null);
1000 annotate.flush();
1002 // Attribute method body.
1003 attribStat(tree.body, localEnv);
1004 }
1006 localEnv.info.scope.leave();
1007 result = tree.type = m.type;
1008 }
1009 finally {
1010 chk.setLint(prevLint);
1011 chk.setMethod(prevMethod);
1012 }
1013 }
1015 public void visitVarDef(JCVariableDecl tree) {
1016 // Local variables have not been entered yet, so we need to do it now:
1017 if (env.info.scope.owner.kind == MTH) {
1018 if (tree.sym != null) {
1019 // parameters have already been entered
1020 env.info.scope.enter(tree.sym);
1021 } else {
1022 try {
1023 annotate.enterStart();
1024 memberEnter.memberEnter(tree, env);
1025 } finally {
1026 annotate.enterDone();
1027 }
1028 }
1029 } else {
1030 if (tree.init != null) {
1031 // Field initializer expression need to be entered.
1032 memberEnter.typeAnnotate(tree.init, env, tree.sym, tree.pos());
1033 annotate.flush();
1034 }
1035 }
1037 VarSymbol v = tree.sym;
1038 Lint lint = env.info.lint.augment(v);
1039 Lint prevLint = chk.setLint(lint);
1041 // Check that the variable's declared type is well-formed.
1042 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1043 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1044 (tree.sym.flags() & PARAMETER) != 0;
1045 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1047 try {
1048 v.getConstValue(); // ensure compile-time constant initializer is evaluated
1049 deferredLintHandler.flush(tree.pos());
1050 chk.checkDeprecatedAnnotation(tree.pos(), v);
1052 if (tree.init != null) {
1053 if ((v.flags_field & FINAL) == 0 ||
1054 !memberEnter.needsLazyConstValue(tree.init)) {
1055 // Not a compile-time constant
1056 // Attribute initializer in a new environment
1057 // with the declared variable as owner.
1058 // Check that initializer conforms to variable's declared type.
1059 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1060 initEnv.info.lint = lint;
1061 // In order to catch self-references, we set the variable's
1062 // declaration position to maximal possible value, effectively
1063 // marking the variable as undefined.
1064 initEnv.info.enclVar = v;
1065 attribExpr(tree.init, initEnv, v.type);
1066 }
1067 }
1068 result = tree.type = v.type;
1069 }
1070 finally {
1071 chk.setLint(prevLint);
1072 }
1073 }
1075 public void visitSkip(JCSkip tree) {
1076 result = null;
1077 }
1079 public void visitBlock(JCBlock tree) {
1080 if (env.info.scope.owner.kind == TYP) {
1081 // Block is a static or instance initializer;
1082 // let the owner of the environment be a freshly
1083 // created BLOCK-method.
1084 Env<AttrContext> localEnv =
1085 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1086 localEnv.info.scope.owner =
1087 new MethodSymbol(tree.flags | BLOCK |
1088 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1089 env.info.scope.owner);
1090 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1092 // Attribute all type annotations in the block
1093 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner, null);
1094 annotate.flush();
1096 {
1097 // Store init and clinit type annotations with the ClassSymbol
1098 // to allow output in Gen.normalizeDefs.
1099 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1100 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1101 if ((tree.flags & STATIC) != 0) {
1102 cs.appendClassInitTypeAttributes(tas);
1103 } else {
1104 cs.appendInitTypeAttributes(tas);
1105 }
1106 }
1108 attribStats(tree.stats, localEnv);
1109 } else {
1110 // Create a new local environment with a local scope.
1111 Env<AttrContext> localEnv =
1112 env.dup(tree, env.info.dup(env.info.scope.dup()));
1113 try {
1114 attribStats(tree.stats, localEnv);
1115 } finally {
1116 localEnv.info.scope.leave();
1117 }
1118 }
1119 result = null;
1120 }
1122 public void visitDoLoop(JCDoWhileLoop tree) {
1123 attribStat(tree.body, env.dup(tree));
1124 attribExpr(tree.cond, env, syms.booleanType);
1125 result = null;
1126 }
1128 public void visitWhileLoop(JCWhileLoop tree) {
1129 attribExpr(tree.cond, env, syms.booleanType);
1130 attribStat(tree.body, env.dup(tree));
1131 result = null;
1132 }
1134 public void visitForLoop(JCForLoop tree) {
1135 Env<AttrContext> loopEnv =
1136 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1137 try {
1138 attribStats(tree.init, loopEnv);
1139 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1140 loopEnv.tree = tree; // before, we were not in loop!
1141 attribStats(tree.step, loopEnv);
1142 attribStat(tree.body, loopEnv);
1143 result = null;
1144 }
1145 finally {
1146 loopEnv.info.scope.leave();
1147 }
1148 }
1150 public void visitForeachLoop(JCEnhancedForLoop tree) {
1151 Env<AttrContext> loopEnv =
1152 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1153 try {
1154 //the Formal Parameter of a for-each loop is not in the scope when
1155 //attributing the for-each expression; we mimick this by attributing
1156 //the for-each expression first (against original scope).
1157 Type exprType = types.cvarUpperBound(attribExpr(tree.expr, loopEnv));
1158 attribStat(tree.var, loopEnv);
1159 chk.checkNonVoid(tree.pos(), exprType);
1160 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1161 if (elemtype == null) {
1162 // or perhaps expr implements Iterable<T>?
1163 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1164 if (base == null) {
1165 log.error(tree.expr.pos(),
1166 "foreach.not.applicable.to.type",
1167 exprType,
1168 diags.fragment("type.req.array.or.iterable"));
1169 elemtype = types.createErrorType(exprType);
1170 } else {
1171 List<Type> iterableParams = base.allparams();
1172 elemtype = iterableParams.isEmpty()
1173 ? syms.objectType
1174 : types.wildUpperBound(iterableParams.head);
1175 }
1176 }
1177 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1178 loopEnv.tree = tree; // before, we were not in loop!
1179 attribStat(tree.body, loopEnv);
1180 result = null;
1181 }
1182 finally {
1183 loopEnv.info.scope.leave();
1184 }
1185 }
1187 public void visitLabelled(JCLabeledStatement tree) {
1188 // Check that label is not used in an enclosing statement
1189 Env<AttrContext> env1 = env;
1190 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1191 if (env1.tree.hasTag(LABELLED) &&
1192 ((JCLabeledStatement) env1.tree).label == tree.label) {
1193 log.error(tree.pos(), "label.already.in.use",
1194 tree.label);
1195 break;
1196 }
1197 env1 = env1.next;
1198 }
1200 attribStat(tree.body, env.dup(tree));
1201 result = null;
1202 }
1204 public void visitSwitch(JCSwitch tree) {
1205 Type seltype = attribExpr(tree.selector, env);
1207 Env<AttrContext> switchEnv =
1208 env.dup(tree, env.info.dup(env.info.scope.dup()));
1210 try {
1212 boolean enumSwitch =
1213 allowEnums &&
1214 (seltype.tsym.flags() & Flags.ENUM) != 0;
1215 boolean stringSwitch = false;
1216 if (types.isSameType(seltype, syms.stringType)) {
1217 if (allowStringsInSwitch) {
1218 stringSwitch = true;
1219 } else {
1220 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1221 }
1222 }
1223 if (!enumSwitch && !stringSwitch)
1224 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1226 // Attribute all cases and
1227 // check that there are no duplicate case labels or default clauses.
1228 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1229 boolean hasDefault = false; // Is there a default label?
1230 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1231 JCCase c = l.head;
1232 Env<AttrContext> caseEnv =
1233 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1234 try {
1235 if (c.pat != null) {
1236 if (enumSwitch) {
1237 Symbol sym = enumConstant(c.pat, seltype);
1238 if (sym == null) {
1239 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1240 } else if (!labels.add(sym)) {
1241 log.error(c.pos(), "duplicate.case.label");
1242 }
1243 } else {
1244 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1245 if (!pattype.hasTag(ERROR)) {
1246 if (pattype.constValue() == null) {
1247 log.error(c.pat.pos(),
1248 (stringSwitch ? "string.const.req" : "const.expr.req"));
1249 } else if (labels.contains(pattype.constValue())) {
1250 log.error(c.pos(), "duplicate.case.label");
1251 } else {
1252 labels.add(pattype.constValue());
1253 }
1254 }
1255 }
1256 } else if (hasDefault) {
1257 log.error(c.pos(), "duplicate.default.label");
1258 } else {
1259 hasDefault = true;
1260 }
1261 attribStats(c.stats, caseEnv);
1262 } finally {
1263 caseEnv.info.scope.leave();
1264 addVars(c.stats, switchEnv.info.scope);
1265 }
1266 }
1268 result = null;
1269 }
1270 finally {
1271 switchEnv.info.scope.leave();
1272 }
1273 }
1274 // where
1275 /** Add any variables defined in stats to the switch scope. */
1276 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1277 for (;stats.nonEmpty(); stats = stats.tail) {
1278 JCTree stat = stats.head;
1279 if (stat.hasTag(VARDEF))
1280 switchScope.enter(((JCVariableDecl) stat).sym);
1281 }
1282 }
1283 // where
1284 /** Return the selected enumeration constant symbol, or null. */
1285 private Symbol enumConstant(JCTree tree, Type enumType) {
1286 if (!tree.hasTag(IDENT)) {
1287 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1288 return syms.errSymbol;
1289 }
1290 JCIdent ident = (JCIdent)tree;
1291 Name name = ident.name;
1292 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1293 e.scope != null; e = e.next()) {
1294 if (e.sym.kind == VAR) {
1295 Symbol s = ident.sym = e.sym;
1296 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1297 ident.type = s.type;
1298 return ((s.flags_field & Flags.ENUM) == 0)
1299 ? null : s;
1300 }
1301 }
1302 return null;
1303 }
1305 public void visitSynchronized(JCSynchronized tree) {
1306 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1307 attribStat(tree.body, env);
1308 result = null;
1309 }
1311 public void visitTry(JCTry tree) {
1312 // Create a new local environment with a local
1313 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1314 try {
1315 boolean isTryWithResource = tree.resources.nonEmpty();
1316 // Create a nested environment for attributing the try block if needed
1317 Env<AttrContext> tryEnv = isTryWithResource ?
1318 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1319 localEnv;
1320 try {
1321 // Attribute resource declarations
1322 for (JCTree resource : tree.resources) {
1323 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1324 @Override
1325 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1326 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1327 }
1328 };
1329 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1330 if (resource.hasTag(VARDEF)) {
1331 attribStat(resource, tryEnv);
1332 twrResult.check(resource, resource.type);
1334 //check that resource type cannot throw InterruptedException
1335 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1337 VarSymbol var = ((JCVariableDecl) resource).sym;
1338 var.setData(ElementKind.RESOURCE_VARIABLE);
1339 } else {
1340 attribTree(resource, tryEnv, twrResult);
1341 }
1342 }
1343 // Attribute body
1344 attribStat(tree.body, tryEnv);
1345 } finally {
1346 if (isTryWithResource)
1347 tryEnv.info.scope.leave();
1348 }
1350 // Attribute catch clauses
1351 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1352 JCCatch c = l.head;
1353 Env<AttrContext> catchEnv =
1354 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1355 try {
1356 Type ctype = attribStat(c.param, catchEnv);
1357 if (TreeInfo.isMultiCatch(c)) {
1358 //multi-catch parameter is implicitly marked as final
1359 c.param.sym.flags_field |= FINAL | UNION;
1360 }
1361 if (c.param.sym.kind == Kinds.VAR) {
1362 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1363 }
1364 chk.checkType(c.param.vartype.pos(),
1365 chk.checkClassType(c.param.vartype.pos(), ctype),
1366 syms.throwableType);
1367 attribStat(c.body, catchEnv);
1368 } finally {
1369 catchEnv.info.scope.leave();
1370 }
1371 }
1373 // Attribute finalizer
1374 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1375 result = null;
1376 }
1377 finally {
1378 localEnv.info.scope.leave();
1379 }
1380 }
1382 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1383 if (!resource.isErroneous() &&
1384 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1385 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1386 Symbol close = syms.noSymbol;
1387 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1388 try {
1389 close = rs.resolveQualifiedMethod(pos,
1390 env,
1391 resource,
1392 names.close,
1393 List.<Type>nil(),
1394 List.<Type>nil());
1395 }
1396 finally {
1397 log.popDiagnosticHandler(discardHandler);
1398 }
1399 if (close.kind == MTH &&
1400 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1401 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1402 env.info.lint.isEnabled(LintCategory.TRY)) {
1403 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1404 }
1405 }
1406 }
1408 public void visitConditional(JCConditional tree) {
1409 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1411 tree.polyKind = (!allowPoly ||
1412 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1413 isBooleanOrNumeric(env, tree)) ?
1414 PolyKind.STANDALONE : PolyKind.POLY;
1416 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1417 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1418 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1419 result = tree.type = types.createErrorType(resultInfo.pt);
1420 return;
1421 }
1423 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1424 unknownExprInfo :
1425 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1426 //this will use enclosing check context to check compatibility of
1427 //subexpression against target type; if we are in a method check context,
1428 //depending on whether boxing is allowed, we could have incompatibilities
1429 @Override
1430 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1431 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1432 }
1433 });
1435 Type truetype = attribTree(tree.truepart, env, condInfo);
1436 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1438 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1439 if (condtype.constValue() != null &&
1440 truetype.constValue() != null &&
1441 falsetype.constValue() != null &&
1442 !owntype.hasTag(NONE)) {
1443 //constant folding
1444 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1445 }
1446 result = check(tree, owntype, VAL, resultInfo);
1447 }
1448 //where
1449 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1450 switch (tree.getTag()) {
1451 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1452 ((JCLiteral)tree).typetag == BOOLEAN ||
1453 ((JCLiteral)tree).typetag == BOT;
1454 case LAMBDA: case REFERENCE: return false;
1455 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1456 case CONDEXPR:
1457 JCConditional condTree = (JCConditional)tree;
1458 return isBooleanOrNumeric(env, condTree.truepart) &&
1459 isBooleanOrNumeric(env, condTree.falsepart);
1460 case APPLY:
1461 JCMethodInvocation speculativeMethodTree =
1462 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1463 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1464 return types.unboxedTypeOrType(owntype).isPrimitive();
1465 case NEWCLASS:
1466 JCExpression className =
1467 removeClassParams.translate(((JCNewClass)tree).clazz);
1468 JCExpression speculativeNewClassTree =
1469 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1470 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1471 default:
1472 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1473 speculativeType = types.unboxedTypeOrType(speculativeType);
1474 return speculativeType.isPrimitive();
1475 }
1476 }
1477 //where
1478 TreeTranslator removeClassParams = new TreeTranslator() {
1479 @Override
1480 public void visitTypeApply(JCTypeApply tree) {
1481 result = translate(tree.clazz);
1482 }
1483 };
1485 /** Compute the type of a conditional expression, after
1486 * checking that it exists. See JLS 15.25. Does not take into
1487 * account the special case where condition and both arms
1488 * are constants.
1489 *
1490 * @param pos The source position to be used for error
1491 * diagnostics.
1492 * @param thentype The type of the expression's then-part.
1493 * @param elsetype The type of the expression's else-part.
1494 */
1495 private Type condType(DiagnosticPosition pos,
1496 Type thentype, Type elsetype) {
1497 // If same type, that is the result
1498 if (types.isSameType(thentype, elsetype))
1499 return thentype.baseType();
1501 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1502 ? thentype : types.unboxedType(thentype);
1503 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1504 ? elsetype : types.unboxedType(elsetype);
1506 // Otherwise, if both arms can be converted to a numeric
1507 // type, return the least numeric type that fits both arms
1508 // (i.e. return larger of the two, or return int if one
1509 // arm is short, the other is char).
1510 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1511 // If one arm has an integer subrange type (i.e., byte,
1512 // short, or char), and the other is an integer constant
1513 // that fits into the subrange, return the subrange type.
1514 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) &&
1515 elseUnboxed.hasTag(INT) &&
1516 types.isAssignable(elseUnboxed, thenUnboxed)) {
1517 return thenUnboxed.baseType();
1518 }
1519 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) &&
1520 thenUnboxed.hasTag(INT) &&
1521 types.isAssignable(thenUnboxed, elseUnboxed)) {
1522 return elseUnboxed.baseType();
1523 }
1525 for (TypeTag tag : primitiveTags) {
1526 Type candidate = syms.typeOfTag[tag.ordinal()];
1527 if (types.isSubtype(thenUnboxed, candidate) &&
1528 types.isSubtype(elseUnboxed, candidate)) {
1529 return candidate;
1530 }
1531 }
1532 }
1534 // Those were all the cases that could result in a primitive
1535 if (allowBoxing) {
1536 if (thentype.isPrimitive())
1537 thentype = types.boxedClass(thentype).type;
1538 if (elsetype.isPrimitive())
1539 elsetype = types.boxedClass(elsetype).type;
1540 }
1542 if (types.isSubtype(thentype, elsetype))
1543 return elsetype.baseType();
1544 if (types.isSubtype(elsetype, thentype))
1545 return thentype.baseType();
1547 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1548 log.error(pos, "neither.conditional.subtype",
1549 thentype, elsetype);
1550 return thentype.baseType();
1551 }
1553 // both are known to be reference types. The result is
1554 // lub(thentype,elsetype). This cannot fail, as it will
1555 // always be possible to infer "Object" if nothing better.
1556 return types.lub(thentype.baseType(), elsetype.baseType());
1557 }
1559 final static TypeTag[] primitiveTags = new TypeTag[]{
1560 BYTE,
1561 CHAR,
1562 SHORT,
1563 INT,
1564 LONG,
1565 FLOAT,
1566 DOUBLE,
1567 BOOLEAN,
1568 };
1570 public void visitIf(JCIf tree) {
1571 attribExpr(tree.cond, env, syms.booleanType);
1572 attribStat(tree.thenpart, env);
1573 if (tree.elsepart != null)
1574 attribStat(tree.elsepart, env);
1575 chk.checkEmptyIf(tree);
1576 result = null;
1577 }
1579 public void visitExec(JCExpressionStatement tree) {
1580 //a fresh environment is required for 292 inference to work properly ---
1581 //see Infer.instantiatePolymorphicSignatureInstance()
1582 Env<AttrContext> localEnv = env.dup(tree);
1583 attribExpr(tree.expr, localEnv);
1584 result = null;
1585 }
1587 public void visitBreak(JCBreak tree) {
1588 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1589 result = null;
1590 }
1592 public void visitContinue(JCContinue tree) {
1593 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1594 result = null;
1595 }
1596 //where
1597 /** Return the target of a break or continue statement, if it exists,
1598 * report an error if not.
1599 * Note: The target of a labelled break or continue is the
1600 * (non-labelled) statement tree referred to by the label,
1601 * not the tree representing the labelled statement itself.
1602 *
1603 * @param pos The position to be used for error diagnostics
1604 * @param tag The tag of the jump statement. This is either
1605 * Tree.BREAK or Tree.CONTINUE.
1606 * @param label The label of the jump statement, or null if no
1607 * label is given.
1608 * @param env The environment current at the jump statement.
1609 */
1610 private JCTree findJumpTarget(DiagnosticPosition pos,
1611 JCTree.Tag tag,
1612 Name label,
1613 Env<AttrContext> env) {
1614 // Search environments outwards from the point of jump.
1615 Env<AttrContext> env1 = env;
1616 LOOP:
1617 while (env1 != null) {
1618 switch (env1.tree.getTag()) {
1619 case LABELLED:
1620 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1621 if (label == labelled.label) {
1622 // If jump is a continue, check that target is a loop.
1623 if (tag == CONTINUE) {
1624 if (!labelled.body.hasTag(DOLOOP) &&
1625 !labelled.body.hasTag(WHILELOOP) &&
1626 !labelled.body.hasTag(FORLOOP) &&
1627 !labelled.body.hasTag(FOREACHLOOP))
1628 log.error(pos, "not.loop.label", label);
1629 // Found labelled statement target, now go inwards
1630 // to next non-labelled tree.
1631 return TreeInfo.referencedStatement(labelled);
1632 } else {
1633 return labelled;
1634 }
1635 }
1636 break;
1637 case DOLOOP:
1638 case WHILELOOP:
1639 case FORLOOP:
1640 case FOREACHLOOP:
1641 if (label == null) return env1.tree;
1642 break;
1643 case SWITCH:
1644 if (label == null && tag == BREAK) return env1.tree;
1645 break;
1646 case LAMBDA:
1647 case METHODDEF:
1648 case CLASSDEF:
1649 break LOOP;
1650 default:
1651 }
1652 env1 = env1.next;
1653 }
1654 if (label != null)
1655 log.error(pos, "undef.label", label);
1656 else if (tag == CONTINUE)
1657 log.error(pos, "cont.outside.loop");
1658 else
1659 log.error(pos, "break.outside.switch.loop");
1660 return null;
1661 }
1663 public void visitReturn(JCReturn tree) {
1664 // Check that there is an enclosing method which is
1665 // nested within than the enclosing class.
1666 if (env.info.returnResult == null) {
1667 log.error(tree.pos(), "ret.outside.meth");
1668 } else {
1669 // Attribute return expression, if it exists, and check that
1670 // it conforms to result type of enclosing method.
1671 if (tree.expr != null) {
1672 if (env.info.returnResult.pt.hasTag(VOID)) {
1673 env.info.returnResult.checkContext.report(tree.expr.pos(),
1674 diags.fragment("unexpected.ret.val"));
1675 }
1676 attribTree(tree.expr, env, env.info.returnResult);
1677 } else if (!env.info.returnResult.pt.hasTag(VOID) &&
1678 !env.info.returnResult.pt.hasTag(NONE)) {
1679 env.info.returnResult.checkContext.report(tree.pos(),
1680 diags.fragment("missing.ret.val"));
1681 }
1682 }
1683 result = null;
1684 }
1686 public void visitThrow(JCThrow tree) {
1687 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1688 if (allowPoly) {
1689 chk.checkType(tree, owntype, syms.throwableType);
1690 }
1691 result = null;
1692 }
1694 public void visitAssert(JCAssert tree) {
1695 attribExpr(tree.cond, env, syms.booleanType);
1696 if (tree.detail != null) {
1697 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1698 }
1699 result = null;
1700 }
1702 /** Visitor method for method invocations.
1703 * NOTE: The method part of an application will have in its type field
1704 * the return type of the method, not the method's type itself!
1705 */
1706 public void visitApply(JCMethodInvocation tree) {
1707 // The local environment of a method application is
1708 // a new environment nested in the current one.
1709 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1711 // The types of the actual method arguments.
1712 List<Type> argtypes;
1714 // The types of the actual method type arguments.
1715 List<Type> typeargtypes = null;
1717 Name methName = TreeInfo.name(tree.meth);
1719 boolean isConstructorCall =
1720 methName == names._this || methName == names._super;
1722 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1723 if (isConstructorCall) {
1724 // We are seeing a ...this(...) or ...super(...) call.
1725 // Check that this is the first statement in a constructor.
1726 if (checkFirstConstructorStat(tree, env)) {
1728 // Record the fact
1729 // that this is a constructor call (using isSelfCall).
1730 localEnv.info.isSelfCall = true;
1732 // Attribute arguments, yielding list of argument types.
1733 attribArgs(tree.args, localEnv, argtypesBuf);
1734 argtypes = argtypesBuf.toList();
1735 typeargtypes = attribTypes(tree.typeargs, localEnv);
1737 // Variable `site' points to the class in which the called
1738 // constructor is defined.
1739 Type site = env.enclClass.sym.type;
1740 if (methName == names._super) {
1741 if (site == syms.objectType) {
1742 log.error(tree.meth.pos(), "no.superclass", site);
1743 site = types.createErrorType(syms.objectType);
1744 } else {
1745 site = types.supertype(site);
1746 }
1747 }
1749 if (site.hasTag(CLASS)) {
1750 Type encl = site.getEnclosingType();
1751 while (encl != null && encl.hasTag(TYPEVAR))
1752 encl = encl.getUpperBound();
1753 if (encl.hasTag(CLASS)) {
1754 // we are calling a nested class
1756 if (tree.meth.hasTag(SELECT)) {
1757 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1759 // We are seeing a prefixed call, of the form
1760 // <expr>.super(...).
1761 // Check that the prefix expression conforms
1762 // to the outer instance type of the class.
1763 chk.checkRefType(qualifier.pos(),
1764 attribExpr(qualifier, localEnv,
1765 encl));
1766 } else if (methName == names._super) {
1767 // qualifier omitted; check for existence
1768 // of an appropriate implicit qualifier.
1769 rs.resolveImplicitThis(tree.meth.pos(),
1770 localEnv, site, true);
1771 }
1772 } else if (tree.meth.hasTag(SELECT)) {
1773 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1774 site.tsym);
1775 }
1777 // if we're calling a java.lang.Enum constructor,
1778 // prefix the implicit String and int parameters
1779 if (site.tsym == syms.enumSym && allowEnums)
1780 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1782 // Resolve the called constructor under the assumption
1783 // that we are referring to a superclass instance of the
1784 // current instance (JLS ???).
1785 boolean selectSuperPrev = localEnv.info.selectSuper;
1786 localEnv.info.selectSuper = true;
1787 localEnv.info.pendingResolutionPhase = null;
1788 Symbol sym = rs.resolveConstructor(
1789 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1790 localEnv.info.selectSuper = selectSuperPrev;
1792 // Set method symbol to resolved constructor...
1793 TreeInfo.setSymbol(tree.meth, sym);
1795 // ...and check that it is legal in the current context.
1796 // (this will also set the tree's type)
1797 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1798 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1799 }
1800 // Otherwise, `site' is an error type and we do nothing
1801 }
1802 result = tree.type = syms.voidType;
1803 } else {
1804 // Otherwise, we are seeing a regular method call.
1805 // Attribute the arguments, yielding list of argument types, ...
1806 int kind = attribArgs(tree.args, localEnv, argtypesBuf);
1807 argtypes = argtypesBuf.toList();
1808 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1810 // ... and attribute the method using as a prototype a methodtype
1811 // whose formal argument types is exactly the list of actual
1812 // arguments (this will also set the method symbol).
1813 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1814 localEnv.info.pendingResolutionPhase = null;
1815 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(kind, mpt, resultInfo.checkContext));
1817 // Compute the result type.
1818 Type restype = mtype.getReturnType();
1819 if (restype.hasTag(WILDCARD))
1820 throw new AssertionError(mtype);
1822 Type qualifier = (tree.meth.hasTag(SELECT))
1823 ? ((JCFieldAccess) tree.meth).selected.type
1824 : env.enclClass.sym.type;
1825 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1827 chk.checkRefTypes(tree.typeargs, typeargtypes);
1829 // Check that value of resulting type is admissible in the
1830 // current context. Also, capture the return type
1831 result = check(tree, capture(restype), VAL, resultInfo);
1832 }
1833 chk.validate(tree.typeargs, localEnv);
1834 }
1835 //where
1836 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1837 if (allowCovariantReturns &&
1838 methodName == names.clone &&
1839 types.isArray(qualifierType)) {
1840 // as a special case, array.clone() has a result that is
1841 // the same as static type of the array being cloned
1842 return qualifierType;
1843 } else if (allowGenerics &&
1844 methodName == names.getClass &&
1845 argtypes.isEmpty()) {
1846 // as a special case, x.getClass() has type Class<? extends |X|>
1847 return new ClassType(restype.getEnclosingType(),
1848 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1849 BoundKind.EXTENDS,
1850 syms.boundClass)),
1851 restype.tsym);
1852 } else {
1853 return restype;
1854 }
1855 }
1857 /** Check that given application node appears as first statement
1858 * in a constructor call.
1859 * @param tree The application node
1860 * @param env The environment current at the application.
1861 */
1862 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1863 JCMethodDecl enclMethod = env.enclMethod;
1864 if (enclMethod != null && enclMethod.name == names.init) {
1865 JCBlock body = enclMethod.body;
1866 if (body.stats.head.hasTag(EXEC) &&
1867 ((JCExpressionStatement) body.stats.head).expr == tree)
1868 return true;
1869 }
1870 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1871 TreeInfo.name(tree.meth));
1872 return false;
1873 }
1875 /** Obtain a method type with given argument types.
1876 */
1877 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1878 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1879 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1880 }
1882 public void visitNewClass(final JCNewClass tree) {
1883 Type owntype = types.createErrorType(tree.type);
1885 // The local environment of a class creation is
1886 // a new environment nested in the current one.
1887 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1889 // The anonymous inner class definition of the new expression,
1890 // if one is defined by it.
1891 JCClassDecl cdef = tree.def;
1893 // If enclosing class is given, attribute it, and
1894 // complete class name to be fully qualified
1895 JCExpression clazz = tree.clazz; // Class field following new
1896 JCExpression clazzid; // Identifier in class field
1897 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1898 annoclazzid = null;
1900 if (clazz.hasTag(TYPEAPPLY)) {
1901 clazzid = ((JCTypeApply) clazz).clazz;
1902 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1903 annoclazzid = (JCAnnotatedType) clazzid;
1904 clazzid = annoclazzid.underlyingType;
1905 }
1906 } else {
1907 if (clazz.hasTag(ANNOTATED_TYPE)) {
1908 annoclazzid = (JCAnnotatedType) clazz;
1909 clazzid = annoclazzid.underlyingType;
1910 } else {
1911 clazzid = clazz;
1912 }
1913 }
1915 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1917 if (tree.encl != null) {
1918 // We are seeing a qualified new, of the form
1919 // <expr>.new C <...> (...) ...
1920 // In this case, we let clazz stand for the name of the
1921 // allocated class C prefixed with the type of the qualifier
1922 // expression, so that we can
1923 // resolve it with standard techniques later. I.e., if
1924 // <expr> has type T, then <expr>.new C <...> (...)
1925 // yields a clazz T.C.
1926 Type encltype = chk.checkRefType(tree.encl.pos(),
1927 attribExpr(tree.encl, env));
1928 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1929 // from expr to the combined type, or not? Yes, do this.
1930 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1931 ((JCIdent) clazzid).name);
1933 EndPosTable endPosTable = this.env.toplevel.endPositions;
1934 endPosTable.storeEnd(clazzid1, tree.getEndPosition(endPosTable));
1935 if (clazz.hasTag(ANNOTATED_TYPE)) {
1936 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1937 List<JCAnnotation> annos = annoType.annotations;
1939 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1940 clazzid1 = make.at(tree.pos).
1941 TypeApply(clazzid1,
1942 ((JCTypeApply) clazz).arguments);
1943 }
1945 clazzid1 = make.at(tree.pos).
1946 AnnotatedType(annos, clazzid1);
1947 } else if (clazz.hasTag(TYPEAPPLY)) {
1948 clazzid1 = make.at(tree.pos).
1949 TypeApply(clazzid1,
1950 ((JCTypeApply) clazz).arguments);
1951 }
1953 clazz = clazzid1;
1954 }
1956 // Attribute clazz expression and store
1957 // symbol + type back into the attributed tree.
1958 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1959 attribIdentAsEnumType(env, (JCIdent)clazz) :
1960 attribType(clazz, env);
1962 clazztype = chk.checkDiamond(tree, clazztype);
1963 chk.validate(clazz, localEnv);
1964 if (tree.encl != null) {
1965 // We have to work in this case to store
1966 // symbol + type back into the attributed tree.
1967 tree.clazz.type = clazztype;
1968 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1969 clazzid.type = ((JCIdent) clazzid).sym.type;
1970 if (annoclazzid != null) {
1971 annoclazzid.type = clazzid.type;
1972 }
1973 if (!clazztype.isErroneous()) {
1974 if (cdef != null && clazztype.tsym.isInterface()) {
1975 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1976 } else if (clazztype.tsym.isStatic()) {
1977 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1978 }
1979 }
1980 } else if (!clazztype.tsym.isInterface() &&
1981 clazztype.getEnclosingType().hasTag(CLASS)) {
1982 // Check for the existence of an apropos outer instance
1983 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1984 }
1986 // Attribute constructor arguments.
1987 ListBuffer<Type> argtypesBuf = new ListBuffer<>();
1988 int pkind = attribArgs(tree.args, localEnv, argtypesBuf);
1989 List<Type> argtypes = argtypesBuf.toList();
1990 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1992 // If we have made no mistakes in the class type...
1993 if (clazztype.hasTag(CLASS)) {
1994 // Enums may not be instantiated except implicitly
1995 if (allowEnums &&
1996 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1997 (!env.tree.hasTag(VARDEF) ||
1998 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1999 ((JCVariableDecl) env.tree).init != tree))
2000 log.error(tree.pos(), "enum.cant.be.instantiated");
2001 // Check that class is not abstract
2002 if (cdef == null &&
2003 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2004 log.error(tree.pos(), "abstract.cant.be.instantiated",
2005 clazztype.tsym);
2006 } else if (cdef != null && clazztype.tsym.isInterface()) {
2007 // Check that no constructor arguments are given to
2008 // anonymous classes implementing an interface
2009 if (!argtypes.isEmpty())
2010 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2012 if (!typeargtypes.isEmpty())
2013 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2015 // Error recovery: pretend no arguments were supplied.
2016 argtypes = List.nil();
2017 typeargtypes = List.nil();
2018 } else if (TreeInfo.isDiamond(tree)) {
2019 ClassType site = new ClassType(clazztype.getEnclosingType(),
2020 clazztype.tsym.type.getTypeArguments(),
2021 clazztype.tsym);
2023 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2024 diamondEnv.info.selectSuper = cdef != null;
2025 diamondEnv.info.pendingResolutionPhase = null;
2027 //if the type of the instance creation expression is a class type
2028 //apply method resolution inference (JLS 15.12.2.7). The return type
2029 //of the resolved constructor will be a partially instantiated type
2030 Symbol constructor = rs.resolveDiamond(tree.pos(),
2031 diamondEnv,
2032 site,
2033 argtypes,
2034 typeargtypes);
2035 tree.constructor = constructor.baseSymbol();
2037 final TypeSymbol csym = clazztype.tsym;
2038 ResultInfo diamondResult = new ResultInfo(pkind, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2039 @Override
2040 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2041 enclosingContext.report(tree.clazz,
2042 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2043 }
2044 });
2045 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2046 constructorType = checkId(tree, site,
2047 constructor,
2048 diamondEnv,
2049 diamondResult);
2051 tree.clazz.type = types.createErrorType(clazztype);
2052 if (!constructorType.isErroneous()) {
2053 tree.clazz.type = clazztype = constructorType.getReturnType();
2054 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2055 }
2056 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2057 }
2059 // Resolve the called constructor under the assumption
2060 // that we are referring to a superclass instance of the
2061 // current instance (JLS ???).
2062 else {
2063 //the following code alters some of the fields in the current
2064 //AttrContext - hence, the current context must be dup'ed in
2065 //order to avoid downstream failures
2066 Env<AttrContext> rsEnv = localEnv.dup(tree);
2067 rsEnv.info.selectSuper = cdef != null;
2068 rsEnv.info.pendingResolutionPhase = null;
2069 tree.constructor = rs.resolveConstructor(
2070 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2071 if (cdef == null) { //do not check twice!
2072 tree.constructorType = checkId(tree,
2073 clazztype,
2074 tree.constructor,
2075 rsEnv,
2076 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2077 if (rsEnv.info.lastResolveVarargs())
2078 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2079 }
2080 if (cdef == null &&
2081 !clazztype.isErroneous() &&
2082 clazztype.getTypeArguments().nonEmpty() &&
2083 findDiamonds) {
2084 findDiamond(localEnv, tree, clazztype);
2085 }
2086 }
2088 if (cdef != null) {
2089 // We are seeing an anonymous class instance creation.
2090 // In this case, the class instance creation
2091 // expression
2092 //
2093 // E.new <typeargs1>C<typargs2>(args) { ... }
2094 //
2095 // is represented internally as
2096 //
2097 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2098 //
2099 // This expression is then *transformed* as follows:
2100 //
2101 // (1) add a STATIC flag to the class definition
2102 // if the current environment is static
2103 // (2) add an extends or implements clause
2104 // (3) add a constructor.
2105 //
2106 // For instance, if C is a class, and ET is the type of E,
2107 // the expression
2108 //
2109 // E.new <typeargs1>C<typargs2>(args) { ... }
2110 //
2111 // is translated to (where X is a fresh name and typarams is the
2112 // parameter list of the super constructor):
2113 //
2114 // new <typeargs1>X(<*nullchk*>E, args) where
2115 // X extends C<typargs2> {
2116 // <typarams> X(ET e, args) {
2117 // e.<typeargs1>super(args)
2118 // }
2119 // ...
2120 // }
2121 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2123 if (clazztype.tsym.isInterface()) {
2124 cdef.implementing = List.of(clazz);
2125 } else {
2126 cdef.extending = clazz;
2127 }
2129 if (resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2130 isSerializable(clazztype)) {
2131 localEnv.info.isSerializable = true;
2132 }
2134 attribStat(cdef, localEnv);
2136 checkLambdaCandidate(tree, cdef.sym, clazztype);
2138 // If an outer instance is given,
2139 // prefix it to the constructor arguments
2140 // and delete it from the new expression
2141 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2142 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2143 argtypes = argtypes.prepend(tree.encl.type);
2144 tree.encl = null;
2145 }
2147 // Reassign clazztype and recompute constructor.
2148 clazztype = cdef.sym.type;
2149 Symbol sym = tree.constructor = rs.resolveConstructor(
2150 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2151 Assert.check(sym.kind < AMBIGUOUS);
2152 tree.constructor = sym;
2153 tree.constructorType = checkId(tree,
2154 clazztype,
2155 tree.constructor,
2156 localEnv,
2157 new ResultInfo(pkind, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2158 }
2160 if (tree.constructor != null && tree.constructor.kind == MTH)
2161 owntype = clazztype;
2162 }
2163 result = check(tree, owntype, VAL, resultInfo);
2164 chk.validate(tree.typeargs, localEnv);
2165 }
2166 //where
2167 void findDiamond(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2168 JCTypeApply ta = (JCTypeApply)tree.clazz;
2169 List<JCExpression> prevTypeargs = ta.arguments;
2170 try {
2171 //create a 'fake' diamond AST node by removing type-argument trees
2172 ta.arguments = List.nil();
2173 ResultInfo findDiamondResult = new ResultInfo(VAL,
2174 resultInfo.checkContext.inferenceContext().free(resultInfo.pt) ? Type.noType : pt());
2175 Type inferred = deferredAttr.attribSpeculative(tree, env, findDiamondResult).type;
2176 Type polyPt = allowPoly ?
2177 syms.objectType :
2178 clazztype;
2179 if (!inferred.isErroneous() &&
2180 (allowPoly && pt() == Infer.anyPoly ?
2181 types.isSameType(inferred, clazztype) :
2182 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings))) {
2183 String key = types.isSameType(clazztype, inferred) ?
2184 "diamond.redundant.args" :
2185 "diamond.redundant.args.1";
2186 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2187 }
2188 } finally {
2189 ta.arguments = prevTypeargs;
2190 }
2191 }
2193 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2194 if (allowLambda &&
2195 identifyLambdaCandidate &&
2196 clazztype.hasTag(CLASS) &&
2197 !pt().hasTag(NONE) &&
2198 types.isFunctionalInterface(clazztype.tsym)) {
2199 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2200 int count = 0;
2201 boolean found = false;
2202 for (Symbol sym : csym.members().getElements()) {
2203 if ((sym.flags() & SYNTHETIC) != 0 ||
2204 sym.isConstructor()) continue;
2205 count++;
2206 if (sym.kind != MTH ||
2207 !sym.name.equals(descriptor.name)) continue;
2208 Type mtype = types.memberType(clazztype, sym);
2209 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2210 found = true;
2211 }
2212 }
2213 if (found && count == 1) {
2214 log.note(tree.def, "potential.lambda.found");
2215 }
2216 }
2217 }
2219 /** Make an attributed null check tree.
2220 */
2221 public JCExpression makeNullCheck(JCExpression arg) {
2222 // optimization: X.this is never null; skip null check
2223 Name name = TreeInfo.name(arg);
2224 if (name == names._this || name == names._super) return arg;
2226 JCTree.Tag optag = NULLCHK;
2227 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2228 tree.operator = syms.nullcheck;
2229 tree.type = arg.type;
2230 return tree;
2231 }
2233 public void visitNewArray(JCNewArray tree) {
2234 Type owntype = types.createErrorType(tree.type);
2235 Env<AttrContext> localEnv = env.dup(tree);
2236 Type elemtype;
2237 if (tree.elemtype != null) {
2238 elemtype = attribType(tree.elemtype, localEnv);
2239 chk.validate(tree.elemtype, localEnv);
2240 owntype = elemtype;
2241 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2242 attribExpr(l.head, localEnv, syms.intType);
2243 owntype = new ArrayType(owntype, syms.arrayClass);
2244 }
2245 } else {
2246 // we are seeing an untyped aggregate { ... }
2247 // this is allowed only if the prototype is an array
2248 if (pt().hasTag(ARRAY)) {
2249 elemtype = types.elemtype(pt());
2250 } else {
2251 if (!pt().hasTag(ERROR)) {
2252 log.error(tree.pos(), "illegal.initializer.for.type",
2253 pt());
2254 }
2255 elemtype = types.createErrorType(pt());
2256 }
2257 }
2258 if (tree.elems != null) {
2259 attribExprs(tree.elems, localEnv, elemtype);
2260 owntype = new ArrayType(elemtype, syms.arrayClass);
2261 }
2262 if (!types.isReifiable(elemtype))
2263 log.error(tree.pos(), "generic.array.creation");
2264 result = check(tree, owntype, VAL, resultInfo);
2265 }
2267 /*
2268 * A lambda expression can only be attributed when a target-type is available.
2269 * In addition, if the target-type is that of a functional interface whose
2270 * descriptor contains inference variables in argument position the lambda expression
2271 * is 'stuck' (see DeferredAttr).
2272 */
2273 @Override
2274 public void visitLambda(final JCLambda that) {
2275 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2276 if (pt().hasTag(NONE)) {
2277 //lambda only allowed in assignment or method invocation/cast context
2278 log.error(that.pos(), "unexpected.lambda");
2279 }
2280 result = that.type = types.createErrorType(pt());
2281 return;
2282 }
2283 //create an environment for attribution of the lambda expression
2284 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2285 boolean needsRecovery =
2286 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2287 try {
2288 Type currentTarget = pt();
2289 if (needsRecovery && isSerializable(currentTarget)) {
2290 localEnv.info.isSerializable = true;
2291 }
2292 List<Type> explicitParamTypes = null;
2293 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2294 //attribute lambda parameters
2295 attribStats(that.params, localEnv);
2296 explicitParamTypes = TreeInfo.types(that.params);
2297 }
2299 Type lambdaType;
2300 if (pt() != Type.recoveryType) {
2301 /* We need to adjust the target. If the target is an
2302 * intersection type, for example: SAM & I1 & I2 ...
2303 * the target will be updated to SAM
2304 */
2305 currentTarget = targetChecker.visit(currentTarget, that);
2306 if (explicitParamTypes != null) {
2307 currentTarget = infer.instantiateFunctionalInterface(that,
2308 currentTarget, explicitParamTypes, resultInfo.checkContext);
2309 }
2310 currentTarget = types.removeWildcards(currentTarget);
2311 lambdaType = types.findDescriptorType(currentTarget);
2312 } else {
2313 currentTarget = Type.recoveryType;
2314 lambdaType = fallbackDescriptorType(that);
2315 }
2317 setFunctionalInfo(localEnv, that, pt(), lambdaType, currentTarget, resultInfo.checkContext);
2319 if (lambdaType.hasTag(FORALL)) {
2320 //lambda expression target desc cannot be a generic method
2321 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2322 lambdaType, kindName(currentTarget.tsym), currentTarget.tsym));
2323 result = that.type = types.createErrorType(pt());
2324 return;
2325 }
2327 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2328 //add param type info in the AST
2329 List<Type> actuals = lambdaType.getParameterTypes();
2330 List<JCVariableDecl> params = that.params;
2332 boolean arityMismatch = false;
2334 while (params.nonEmpty()) {
2335 if (actuals.isEmpty()) {
2336 //not enough actuals to perform lambda parameter inference
2337 arityMismatch = true;
2338 }
2339 //reset previously set info
2340 Type argType = arityMismatch ?
2341 syms.errType :
2342 actuals.head;
2343 params.head.vartype = make.at(params.head).Type(argType);
2344 params.head.sym = null;
2345 actuals = actuals.isEmpty() ?
2346 actuals :
2347 actuals.tail;
2348 params = params.tail;
2349 }
2351 //attribute lambda parameters
2352 attribStats(that.params, localEnv);
2354 if (arityMismatch) {
2355 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2356 result = that.type = types.createErrorType(currentTarget);
2357 return;
2358 }
2359 }
2361 //from this point on, no recovery is needed; if we are in assignment context
2362 //we will be able to attribute the whole lambda body, regardless of errors;
2363 //if we are in a 'check' method context, and the lambda is not compatible
2364 //with the target-type, it will be recovered anyway in Attr.checkId
2365 needsRecovery = false;
2367 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2368 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2369 new FunctionalReturnContext(resultInfo.checkContext);
2371 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2372 recoveryInfo :
2373 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2374 localEnv.info.returnResult = bodyResultInfo;
2376 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2377 attribTree(that.getBody(), localEnv, bodyResultInfo);
2378 } else {
2379 JCBlock body = (JCBlock)that.body;
2380 attribStats(body.stats, localEnv);
2381 }
2383 result = check(that, currentTarget, VAL, resultInfo);
2385 boolean isSpeculativeRound =
2386 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2388 preFlow(that);
2389 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2391 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext);
2393 if (!isSpeculativeRound) {
2394 //add thrown types as bounds to the thrown types free variables if needed:
2395 if (resultInfo.checkContext.inferenceContext().free(lambdaType.getThrownTypes())) {
2396 List<Type> inferredThrownTypes = flow.analyzeLambdaThrownTypes(env, that, make);
2397 List<Type> thrownTypes = resultInfo.checkContext.inferenceContext().asUndetVars(lambdaType.getThrownTypes());
2399 chk.unhandled(inferredThrownTypes, thrownTypes);
2400 }
2402 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, currentTarget);
2403 }
2404 result = check(that, currentTarget, VAL, resultInfo);
2405 } catch (Types.FunctionDescriptorLookupError ex) {
2406 JCDiagnostic cause = ex.getDiagnostic();
2407 resultInfo.checkContext.report(that, cause);
2408 result = that.type = types.createErrorType(pt());
2409 return;
2410 } finally {
2411 localEnv.info.scope.leave();
2412 if (needsRecovery) {
2413 attribTree(that, env, recoveryInfo);
2414 }
2415 }
2416 }
2417 //where
2418 void preFlow(JCLambda tree) {
2419 new PostAttrAnalyzer() {
2420 @Override
2421 public void scan(JCTree tree) {
2422 if (tree == null ||
2423 (tree.type != null &&
2424 tree.type == Type.stuckType)) {
2425 //don't touch stuck expressions!
2426 return;
2427 }
2428 super.scan(tree);
2429 }
2430 }.scan(tree);
2431 }
2433 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2435 @Override
2436 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2437 return t.isCompound() ?
2438 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2439 }
2441 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2442 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2443 Type target = null;
2444 for (Type bound : ict.getExplicitComponents()) {
2445 TypeSymbol boundSym = bound.tsym;
2446 if (types.isFunctionalInterface(boundSym) &&
2447 types.findDescriptorSymbol(boundSym) == desc) {
2448 target = bound;
2449 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2450 //bound must be an interface
2451 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2452 }
2453 }
2454 return target != null ?
2455 target :
2456 ict.getExplicitComponents().head; //error recovery
2457 }
2459 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2460 ListBuffer<Type> targs = new ListBuffer<>();
2461 ListBuffer<Type> supertypes = new ListBuffer<>();
2462 for (Type i : ict.interfaces_field) {
2463 if (i.isParameterized()) {
2464 targs.appendList(i.tsym.type.allparams());
2465 }
2466 supertypes.append(i.tsym.type);
2467 }
2468 IntersectionClassType notionalIntf =
2469 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2470 notionalIntf.allparams_field = targs.toList();
2471 notionalIntf.tsym.flags_field |= INTERFACE;
2472 return notionalIntf.tsym;
2473 }
2475 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2476 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2477 diags.fragment(key, args)));
2478 }
2479 };
2481 private Type fallbackDescriptorType(JCExpression tree) {
2482 switch (tree.getTag()) {
2483 case LAMBDA:
2484 JCLambda lambda = (JCLambda)tree;
2485 List<Type> argtypes = List.nil();
2486 for (JCVariableDecl param : lambda.params) {
2487 argtypes = param.vartype != null ?
2488 argtypes.append(param.vartype.type) :
2489 argtypes.append(syms.errType);
2490 }
2491 return new MethodType(argtypes, Type.recoveryType,
2492 List.of(syms.throwableType), syms.methodClass);
2493 case REFERENCE:
2494 return new MethodType(List.<Type>nil(), Type.recoveryType,
2495 List.of(syms.throwableType), syms.methodClass);
2496 default:
2497 Assert.error("Cannot get here!");
2498 }
2499 return null;
2500 }
2502 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2503 final InferenceContext inferenceContext, final Type... ts) {
2504 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2505 }
2507 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2508 final InferenceContext inferenceContext, final List<Type> ts) {
2509 if (inferenceContext.free(ts)) {
2510 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2511 @Override
2512 public void typesInferred(InferenceContext inferenceContext) {
2513 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2514 }
2515 });
2516 } else {
2517 for (Type t : ts) {
2518 rs.checkAccessibleType(env, t);
2519 }
2520 }
2521 }
2523 /**
2524 * Lambda/method reference have a special check context that ensures
2525 * that i.e. a lambda return type is compatible with the expected
2526 * type according to both the inherited context and the assignment
2527 * context.
2528 */
2529 class FunctionalReturnContext extends Check.NestedCheckContext {
2531 FunctionalReturnContext(CheckContext enclosingContext) {
2532 super(enclosingContext);
2533 }
2535 @Override
2536 public boolean compatible(Type found, Type req, Warner warn) {
2537 //return type must be compatible in both current context and assignment context
2538 return chk.basicHandler.compatible(found, inferenceContext().asUndetVar(req), warn);
2539 }
2541 @Override
2542 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2543 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2544 }
2545 }
2547 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2549 JCExpression expr;
2551 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2552 super(enclosingContext);
2553 this.expr = expr;
2554 }
2556 @Override
2557 public boolean compatible(Type found, Type req, Warner warn) {
2558 //a void return is compatible with an expression statement lambda
2559 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2560 super.compatible(found, req, warn);
2561 }
2562 }
2564 /**
2565 * Lambda compatibility. Check that given return types, thrown types, parameter types
2566 * are compatible with the expected functional interface descriptor. This means that:
2567 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2568 * types must be compatible with the return type of the expected descriptor.
2569 */
2570 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext) {
2571 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2573 //return values have already been checked - but if lambda has no return
2574 //values, we must ensure that void/value compatibility is correct;
2575 //this amounts at checking that, if a lambda body can complete normally,
2576 //the descriptor's return type must be void
2577 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2578 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2579 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2580 diags.fragment("missing.ret.val", returnType)));
2581 }
2583 List<Type> argTypes = checkContext.inferenceContext().asUndetVars(descriptor.getParameterTypes());
2584 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2585 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2586 }
2587 }
2589 /* Map to hold 'fake' clinit methods. If a lambda is used to initialize a
2590 * static field and that lambda has type annotations, these annotations will
2591 * also be stored at these fake clinit methods.
2592 *
2593 * LambdaToMethod also use fake clinit methods so they can be reused.
2594 * Also as LTM is a phase subsequent to attribution, the methods from
2595 * clinits can be safely removed by LTM to save memory.
2596 */
2597 private Map<ClassSymbol, MethodSymbol> clinits = new HashMap<>();
2599 public MethodSymbol removeClinit(ClassSymbol sym) {
2600 return clinits.remove(sym);
2601 }
2603 /* This method returns an environment to be used to attribute a lambda
2604 * expression.
2605 *
2606 * The owner of this environment is a method symbol. If the current owner
2607 * is not a method, for example if the lambda is used to initialize
2608 * a field, then if the field is:
2609 *
2610 * - an instance field, we use the first constructor.
2611 * - a static field, we create a fake clinit method.
2612 */
2613 public Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2614 Env<AttrContext> lambdaEnv;
2615 Symbol owner = env.info.scope.owner;
2616 if (owner.kind == VAR && owner.owner.kind == TYP) {
2617 //field initializer
2618 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2619 ClassSymbol enclClass = owner.enclClass();
2620 /* if the field isn't static, then we can get the first constructor
2621 * and use it as the owner of the environment. This is what
2622 * LTM code is doing to look for type annotations so we are fine.
2623 */
2624 if ((owner.flags() & STATIC) == 0) {
2625 for (Symbol s : enclClass.members_field.getElementsByName(names.init)) {
2626 lambdaEnv.info.scope.owner = s;
2627 break;
2628 }
2629 } else {
2630 /* if the field is static then we need to create a fake clinit
2631 * method, this method can later be reused by LTM.
2632 */
2633 MethodSymbol clinit = clinits.get(enclClass);
2634 if (clinit == null) {
2635 Type clinitType = new MethodType(List.<Type>nil(),
2636 syms.voidType, List.<Type>nil(), syms.methodClass);
2637 clinit = new MethodSymbol(STATIC | SYNTHETIC | PRIVATE,
2638 names.clinit, clinitType, enclClass);
2639 clinit.params = List.<VarSymbol>nil();
2640 clinits.put(enclClass, clinit);
2641 }
2642 lambdaEnv.info.scope.owner = clinit;
2643 }
2644 } else {
2645 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2646 }
2647 return lambdaEnv;
2648 }
2650 @Override
2651 public void visitReference(final JCMemberReference that) {
2652 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2653 if (pt().hasTag(NONE)) {
2654 //method reference only allowed in assignment or method invocation/cast context
2655 log.error(that.pos(), "unexpected.mref");
2656 }
2657 result = that.type = types.createErrorType(pt());
2658 return;
2659 }
2660 final Env<AttrContext> localEnv = env.dup(that);
2661 try {
2662 //attribute member reference qualifier - if this is a constructor
2663 //reference, the expected kind must be a type
2664 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2666 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2667 exprType = chk.checkConstructorRefType(that.expr, exprType);
2668 if (!exprType.isErroneous() &&
2669 exprType.isRaw() &&
2670 that.typeargs != null) {
2671 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2672 diags.fragment("mref.infer.and.explicit.params"));
2673 exprType = types.createErrorType(exprType);
2674 }
2675 }
2677 if (exprType.isErroneous()) {
2678 //if the qualifier expression contains problems,
2679 //give up attribution of method reference
2680 result = that.type = exprType;
2681 return;
2682 }
2684 if (TreeInfo.isStaticSelector(that.expr, names)) {
2685 //if the qualifier is a type, validate it; raw warning check is
2686 //omitted as we don't know at this stage as to whether this is a
2687 //raw selector (because of inference)
2688 chk.validate(that.expr, env, false);
2689 }
2691 //attrib type-arguments
2692 List<Type> typeargtypes = List.nil();
2693 if (that.typeargs != null) {
2694 typeargtypes = attribTypes(that.typeargs, localEnv);
2695 }
2697 Type desc;
2698 Type currentTarget = pt();
2699 boolean isTargetSerializable =
2700 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2701 isSerializable(currentTarget);
2702 if (currentTarget != Type.recoveryType) {
2703 currentTarget = types.removeWildcards(targetChecker.visit(currentTarget, that));
2704 desc = types.findDescriptorType(currentTarget);
2705 } else {
2706 currentTarget = Type.recoveryType;
2707 desc = fallbackDescriptorType(that);
2708 }
2710 setFunctionalInfo(localEnv, that, pt(), desc, currentTarget, resultInfo.checkContext);
2711 List<Type> argtypes = desc.getParameterTypes();
2712 Resolve.MethodCheck referenceCheck = rs.resolveMethodCheck;
2714 if (resultInfo.checkContext.inferenceContext().free(argtypes)) {
2715 referenceCheck = rs.new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
2716 }
2718 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult = null;
2719 List<Type> saved_undet = resultInfo.checkContext.inferenceContext().save();
2720 try {
2721 refResult = rs.resolveMemberReference(localEnv, that, that.expr.type,
2722 that.name, argtypes, typeargtypes, referenceCheck,
2723 resultInfo.checkContext.inferenceContext(),
2724 resultInfo.checkContext.deferredAttrContext().mode);
2725 } finally {
2726 resultInfo.checkContext.inferenceContext().rollback(saved_undet);
2727 }
2729 Symbol refSym = refResult.fst;
2730 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2732 if (refSym.kind != MTH) {
2733 boolean targetError;
2734 switch (refSym.kind) {
2735 case ABSENT_MTH:
2736 targetError = false;
2737 break;
2738 case WRONG_MTH:
2739 case WRONG_MTHS:
2740 case AMBIGUOUS:
2741 case HIDDEN:
2742 case STATICERR:
2743 case MISSING_ENCL:
2744 case WRONG_STATICNESS:
2745 targetError = true;
2746 break;
2747 default:
2748 Assert.error("unexpected result kind " + refSym.kind);
2749 targetError = false;
2750 }
2752 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym.baseSymbol()).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2753 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2755 JCDiagnostic.DiagnosticType diagKind = targetError ?
2756 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2758 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2759 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2761 if (targetError && currentTarget == Type.recoveryType) {
2762 //a target error doesn't make sense during recovery stage
2763 //as we don't know what actual parameter types are
2764 result = that.type = currentTarget;
2765 return;
2766 } else {
2767 if (targetError) {
2768 resultInfo.checkContext.report(that, diag);
2769 } else {
2770 log.report(diag);
2771 }
2772 result = that.type = types.createErrorType(currentTarget);
2773 return;
2774 }
2775 }
2777 that.sym = refSym.baseSymbol();
2778 that.kind = lookupHelper.referenceKind(that.sym);
2779 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2781 if (desc.getReturnType() == Type.recoveryType) {
2782 // stop here
2783 result = that.type = currentTarget;
2784 return;
2785 }
2787 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2789 if (that.getMode() == ReferenceMode.INVOKE &&
2790 TreeInfo.isStaticSelector(that.expr, names) &&
2791 that.kind.isUnbound() &&
2792 !desc.getParameterTypes().head.isParameterized()) {
2793 chk.checkRaw(that.expr, localEnv);
2794 }
2796 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2797 exprType.getTypeArguments().nonEmpty()) {
2798 //static ref with class type-args
2799 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2800 diags.fragment("static.mref.with.targs"));
2801 result = that.type = types.createErrorType(currentTarget);
2802 return;
2803 }
2805 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2806 !that.kind.isUnbound()) {
2807 //no static bound mrefs
2808 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2809 diags.fragment("static.bound.mref"));
2810 result = that.type = types.createErrorType(currentTarget);
2811 return;
2812 }
2814 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2815 // Check that super-qualified symbols are not abstract (JLS)
2816 rs.checkNonAbstract(that.pos(), that.sym);
2817 }
2819 if (isTargetSerializable) {
2820 chk.checkElemAccessFromSerializableLambda(that);
2821 }
2822 }
2824 ResultInfo checkInfo =
2825 resultInfo.dup(newMethodTemplate(
2826 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2827 that.kind.isUnbound() ? argtypes.tail : argtypes, typeargtypes),
2828 new FunctionalReturnContext(resultInfo.checkContext));
2830 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2832 if (that.kind.isUnbound() &&
2833 resultInfo.checkContext.inferenceContext().free(argtypes.head)) {
2834 //re-generate inference constraints for unbound receiver
2835 if (!types.isSubtype(resultInfo.checkContext.inferenceContext().asUndetVar(argtypes.head), exprType)) {
2836 //cannot happen as this has already been checked - we just need
2837 //to regenerate the inference constraints, as that has been lost
2838 //as a result of the call to inferenceContext.save()
2839 Assert.error("Can't get here");
2840 }
2841 }
2843 if (!refType.isErroneous()) {
2844 refType = types.createMethodTypeWithReturn(refType,
2845 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2846 }
2848 //go ahead with standard method reference compatibility check - note that param check
2849 //is a no-op (as this has been taken care during method applicability)
2850 boolean isSpeculativeRound =
2851 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2852 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2853 if (!isSpeculativeRound) {
2854 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, currentTarget);
2855 }
2856 result = check(that, currentTarget, VAL, resultInfo);
2857 } catch (Types.FunctionDescriptorLookupError ex) {
2858 JCDiagnostic cause = ex.getDiagnostic();
2859 resultInfo.checkContext.report(that, cause);
2860 result = that.type = types.createErrorType(pt());
2861 return;
2862 }
2863 }
2864 //where
2865 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2866 //if this is a constructor reference, the expected kind must be a type
2867 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2868 }
2871 @SuppressWarnings("fallthrough")
2872 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2873 Type returnType = checkContext.inferenceContext().asUndetVar(descriptor.getReturnType());
2875 Type resType;
2876 switch (tree.getMode()) {
2877 case NEW:
2878 if (!tree.expr.type.isRaw()) {
2879 resType = tree.expr.type;
2880 break;
2881 }
2882 default:
2883 resType = refType.getReturnType();
2884 }
2886 Type incompatibleReturnType = resType;
2888 if (returnType.hasTag(VOID)) {
2889 incompatibleReturnType = null;
2890 }
2892 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2893 if (resType.isErroneous() ||
2894 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2895 incompatibleReturnType = null;
2896 }
2897 }
2899 if (incompatibleReturnType != null) {
2900 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2901 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2902 }
2904 if (!speculativeAttr) {
2905 List<Type> thrownTypes = checkContext.inferenceContext().asUndetVars(descriptor.getThrownTypes());
2906 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2907 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2908 }
2909 }
2910 }
2912 /**
2913 * Set functional type info on the underlying AST. Note: as the target descriptor
2914 * might contain inference variables, we might need to register an hook in the
2915 * current inference context.
2916 */
2917 private void setFunctionalInfo(final Env<AttrContext> env, final JCFunctionalExpression fExpr,
2918 final Type pt, final Type descriptorType, final Type primaryTarget, final CheckContext checkContext) {
2919 if (checkContext.inferenceContext().free(descriptorType)) {
2920 checkContext.inferenceContext().addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2921 public void typesInferred(InferenceContext inferenceContext) {
2922 setFunctionalInfo(env, fExpr, pt, inferenceContext.asInstType(descriptorType),
2923 inferenceContext.asInstType(primaryTarget), checkContext);
2924 }
2925 });
2926 } else {
2927 ListBuffer<Type> targets = new ListBuffer<>();
2928 if (pt.hasTag(CLASS)) {
2929 if (pt.isCompound()) {
2930 targets.append(types.removeWildcards(primaryTarget)); //this goes first
2931 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2932 if (t != primaryTarget) {
2933 targets.append(types.removeWildcards(t));
2934 }
2935 }
2936 } else {
2937 targets.append(types.removeWildcards(primaryTarget));
2938 }
2939 }
2940 fExpr.targets = targets.toList();
2941 if (checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK &&
2942 pt != Type.recoveryType) {
2943 //check that functional interface class is well-formed
2944 try {
2945 /* Types.makeFunctionalInterfaceClass() may throw an exception
2946 * when it's executed post-inference. See the listener code
2947 * above.
2948 */
2949 ClassSymbol csym = types.makeFunctionalInterfaceClass(env,
2950 names.empty, List.of(fExpr.targets.head), ABSTRACT);
2951 if (csym != null) {
2952 chk.checkImplementations(env.tree, csym, csym);
2953 }
2954 } catch (Types.FunctionDescriptorLookupError ex) {
2955 JCDiagnostic cause = ex.getDiagnostic();
2956 resultInfo.checkContext.report(env.tree, cause);
2957 }
2958 }
2959 }
2960 }
2962 public void visitParens(JCParens tree) {
2963 Type owntype = attribTree(tree.expr, env, resultInfo);
2964 result = check(tree, owntype, pkind(), resultInfo);
2965 Symbol sym = TreeInfo.symbol(tree);
2966 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2967 log.error(tree.pos(), "illegal.start.of.type");
2968 }
2970 public void visitAssign(JCAssign tree) {
2971 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2972 Type capturedType = capture(owntype);
2973 attribExpr(tree.rhs, env, owntype);
2974 result = check(tree, capturedType, VAL, resultInfo);
2975 }
2977 public void visitAssignop(JCAssignOp tree) {
2978 // Attribute arguments.
2979 Type owntype = attribTree(tree.lhs, env, varInfo);
2980 Type operand = attribExpr(tree.rhs, env);
2981 // Find operator.
2982 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2983 tree.pos(), tree.getTag().noAssignOp(), env,
2984 owntype, operand);
2986 if (operator.kind == MTH &&
2987 !owntype.isErroneous() &&
2988 !operand.isErroneous()) {
2989 chk.checkOperator(tree.pos(),
2990 (OperatorSymbol)operator,
2991 tree.getTag().noAssignOp(),
2992 owntype,
2993 operand);
2994 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2995 chk.checkCastable(tree.rhs.pos(),
2996 operator.type.getReturnType(),
2997 owntype);
2998 }
2999 result = check(tree, owntype, VAL, resultInfo);
3000 }
3002 public void visitUnary(JCUnary tree) {
3003 // Attribute arguments.
3004 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
3005 ? attribTree(tree.arg, env, varInfo)
3006 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
3008 // Find operator.
3009 Symbol operator = tree.operator =
3010 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
3012 Type owntype = types.createErrorType(tree.type);
3013 if (operator.kind == MTH &&
3014 !argtype.isErroneous()) {
3015 owntype = (tree.getTag().isIncOrDecUnaryOp())
3016 ? tree.arg.type
3017 : operator.type.getReturnType();
3018 int opc = ((OperatorSymbol)operator).opcode;
3020 // If the argument is constant, fold it.
3021 if (argtype.constValue() != null) {
3022 Type ctype = cfolder.fold1(opc, argtype);
3023 if (ctype != null) {
3024 owntype = cfolder.coerce(ctype, owntype);
3025 }
3026 }
3027 }
3028 result = check(tree, owntype, VAL, resultInfo);
3029 }
3031 public void visitBinary(JCBinary tree) {
3032 // Attribute arguments.
3033 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
3034 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
3036 // Find operator.
3037 Symbol operator = tree.operator =
3038 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
3040 Type owntype = types.createErrorType(tree.type);
3041 if (operator.kind == MTH &&
3042 !left.isErroneous() &&
3043 !right.isErroneous()) {
3044 owntype = operator.type.getReturnType();
3045 // This will figure out when unboxing can happen and
3046 // choose the right comparison operator.
3047 int opc = chk.checkOperator(tree.lhs.pos(),
3048 (OperatorSymbol)operator,
3049 tree.getTag(),
3050 left,
3051 right);
3053 // If both arguments are constants, fold them.
3054 if (left.constValue() != null && right.constValue() != null) {
3055 Type ctype = cfolder.fold2(opc, left, right);
3056 if (ctype != null) {
3057 owntype = cfolder.coerce(ctype, owntype);
3058 }
3059 }
3061 // Check that argument types of a reference ==, != are
3062 // castable to each other, (JLS 15.21). Note: unboxing
3063 // comparisons will not have an acmp* opc at this point.
3064 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3065 if (!types.isEqualityComparable(left, right,
3066 new Warner(tree.pos()))) {
3067 log.error(tree.pos(), "incomparable.types", left, right);
3068 }
3069 }
3071 chk.checkDivZero(tree.rhs.pos(), operator, right);
3072 }
3073 result = check(tree, owntype, VAL, resultInfo);
3074 }
3076 public void visitTypeCast(final JCTypeCast tree) {
3077 Type clazztype = attribType(tree.clazz, env);
3078 chk.validate(tree.clazz, env, false);
3079 //a fresh environment is required for 292 inference to work properly ---
3080 //see Infer.instantiatePolymorphicSignatureInstance()
3081 Env<AttrContext> localEnv = env.dup(tree);
3082 //should we propagate the target type?
3083 final ResultInfo castInfo;
3084 JCExpression expr = TreeInfo.skipParens(tree.expr);
3085 boolean isPoly = allowPoly && (expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE));
3086 if (isPoly) {
3087 //expression is a poly - we need to propagate target type info
3088 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3089 @Override
3090 public boolean compatible(Type found, Type req, Warner warn) {
3091 return types.isCastable(found, req, warn);
3092 }
3093 });
3094 } else {
3095 //standalone cast - target-type info is not propagated
3096 castInfo = unknownExprInfo;
3097 }
3098 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3099 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3100 if (exprtype.constValue() != null)
3101 owntype = cfolder.coerce(exprtype, owntype);
3102 result = check(tree, capture(owntype), VAL, resultInfo);
3103 if (!isPoly)
3104 chk.checkRedundantCast(localEnv, tree);
3105 }
3107 public void visitTypeTest(JCInstanceOf tree) {
3108 Type exprtype = chk.checkNullOrRefType(
3109 tree.expr.pos(), attribExpr(tree.expr, env));
3110 Type clazztype = attribType(tree.clazz, env);
3111 if (!clazztype.hasTag(TYPEVAR)) {
3112 clazztype = chk.checkClassOrArrayType(tree.clazz.pos(), clazztype);
3113 }
3114 if (!clazztype.isErroneous() && !types.isReifiable(clazztype)) {
3115 log.error(tree.clazz.pos(), "illegal.generic.type.for.instof");
3116 clazztype = types.createErrorType(clazztype);
3117 }
3118 chk.validate(tree.clazz, env, false);
3119 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3120 result = check(tree, syms.booleanType, VAL, resultInfo);
3121 }
3123 public void visitIndexed(JCArrayAccess tree) {
3124 Type owntype = types.createErrorType(tree.type);
3125 Type atype = attribExpr(tree.indexed, env);
3126 attribExpr(tree.index, env, syms.intType);
3127 if (types.isArray(atype))
3128 owntype = types.elemtype(atype);
3129 else if (!atype.hasTag(ERROR))
3130 log.error(tree.pos(), "array.req.but.found", atype);
3131 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3132 result = check(tree, owntype, VAR, resultInfo);
3133 }
3135 public void visitIdent(JCIdent tree) {
3136 Symbol sym;
3138 // Find symbol
3139 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3140 // If we are looking for a method, the prototype `pt' will be a
3141 // method type with the type of the call's arguments as parameters.
3142 env.info.pendingResolutionPhase = null;
3143 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3144 } else if (tree.sym != null && tree.sym.kind != VAR) {
3145 sym = tree.sym;
3146 } else {
3147 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3148 }
3149 tree.sym = sym;
3151 // (1) Also find the environment current for the class where
3152 // sym is defined (`symEnv').
3153 // Only for pre-tiger versions (1.4 and earlier):
3154 // (2) Also determine whether we access symbol out of an anonymous
3155 // class in a this or super call. This is illegal for instance
3156 // members since such classes don't carry a this$n link.
3157 // (`noOuterThisPath').
3158 Env<AttrContext> symEnv = env;
3159 boolean noOuterThisPath = false;
3160 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3161 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3162 sym.owner.kind == TYP &&
3163 tree.name != names._this && tree.name != names._super) {
3165 // Find environment in which identifier is defined.
3166 while (symEnv.outer != null &&
3167 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3168 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3169 noOuterThisPath = !allowAnonOuterThis;
3170 symEnv = symEnv.outer;
3171 }
3172 }
3174 // If symbol is a variable, ...
3175 if (sym.kind == VAR) {
3176 VarSymbol v = (VarSymbol)sym;
3178 // ..., evaluate its initializer, if it has one, and check for
3179 // illegal forward reference.
3180 checkInit(tree, env, v, false);
3182 // If we are expecting a variable (as opposed to a value), check
3183 // that the variable is assignable in the current environment.
3184 if (pkind() == VAR)
3185 checkAssignable(tree.pos(), v, null, env);
3186 }
3188 // In a constructor body,
3189 // if symbol is a field or instance method, check that it is
3190 // not accessed before the supertype constructor is called.
3191 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3192 (sym.kind & (VAR | MTH)) != 0 &&
3193 sym.owner.kind == TYP &&
3194 (sym.flags() & STATIC) == 0) {
3195 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3196 }
3197 Env<AttrContext> env1 = env;
3198 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3199 // If the found symbol is inaccessible, then it is
3200 // accessed through an enclosing instance. Locate this
3201 // enclosing instance:
3202 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3203 env1 = env1.outer;
3204 }
3206 if (env.info.isSerializable) {
3207 chk.checkElemAccessFromSerializableLambda(tree);
3208 }
3210 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3211 }
3213 public void visitSelect(JCFieldAccess tree) {
3214 // Determine the expected kind of the qualifier expression.
3215 int skind = 0;
3216 if (tree.name == names._this || tree.name == names._super ||
3217 tree.name == names._class)
3218 {
3219 skind = TYP;
3220 } else {
3221 if ((pkind() & PCK) != 0) skind = skind | PCK;
3222 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3223 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3224 }
3226 // Attribute the qualifier expression, and determine its symbol (if any).
3227 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3228 if ((pkind() & (PCK | TYP)) == 0)
3229 site = capture(site); // Capture field access
3231 // don't allow T.class T[].class, etc
3232 if (skind == TYP) {
3233 Type elt = site;
3234 while (elt.hasTag(ARRAY))
3235 elt = ((ArrayType)elt.unannotatedType()).elemtype;
3236 if (elt.hasTag(TYPEVAR)) {
3237 log.error(tree.pos(), "type.var.cant.be.deref");
3238 result = tree.type = types.createErrorType(tree.name, site.tsym, site);
3239 tree.sym = tree.type.tsym;
3240 return ;
3241 }
3242 }
3244 // If qualifier symbol is a type or `super', assert `selectSuper'
3245 // for the selection. This is relevant for determining whether
3246 // protected symbols are accessible.
3247 Symbol sitesym = TreeInfo.symbol(tree.selected);
3248 boolean selectSuperPrev = env.info.selectSuper;
3249 env.info.selectSuper =
3250 sitesym != null &&
3251 sitesym.name == names._super;
3253 // Determine the symbol represented by the selection.
3254 env.info.pendingResolutionPhase = null;
3255 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3256 if (sym.kind == VAR && sym.name != names._super && env.info.defaultSuperCallSite != null) {
3257 log.error(tree.selected.pos(), "not.encl.class", site.tsym);
3258 sym = syms.errSymbol;
3259 }
3260 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3261 site = capture(site);
3262 sym = selectSym(tree, sitesym, site, env, resultInfo);
3263 }
3264 boolean varArgs = env.info.lastResolveVarargs();
3265 tree.sym = sym;
3267 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3268 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3269 site = capture(site);
3270 }
3272 // If that symbol is a variable, ...
3273 if (sym.kind == VAR) {
3274 VarSymbol v = (VarSymbol)sym;
3276 // ..., evaluate its initializer, if it has one, and check for
3277 // illegal forward reference.
3278 checkInit(tree, env, v, true);
3280 // If we are expecting a variable (as opposed to a value), check
3281 // that the variable is assignable in the current environment.
3282 if (pkind() == VAR)
3283 checkAssignable(tree.pos(), v, tree.selected, env);
3284 }
3286 if (sitesym != null &&
3287 sitesym.kind == VAR &&
3288 ((VarSymbol)sitesym).isResourceVariable() &&
3289 sym.kind == MTH &&
3290 sym.name.equals(names.close) &&
3291 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3292 env.info.lint.isEnabled(LintCategory.TRY)) {
3293 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3294 }
3296 // Disallow selecting a type from an expression
3297 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3298 tree.type = check(tree.selected, pt(),
3299 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3300 }
3302 if (isType(sitesym)) {
3303 if (sym.name == names._this) {
3304 // If `C' is the currently compiled class, check that
3305 // C.this' does not appear in a call to a super(...)
3306 if (env.info.isSelfCall &&
3307 site.tsym == env.enclClass.sym) {
3308 chk.earlyRefError(tree.pos(), sym);
3309 }
3310 } else {
3311 // Check if type-qualified fields or methods are static (JLS)
3312 if ((sym.flags() & STATIC) == 0 &&
3313 !env.next.tree.hasTag(REFERENCE) &&
3314 sym.name != names._super &&
3315 (sym.kind == VAR || sym.kind == MTH)) {
3316 rs.accessBase(rs.new StaticError(sym),
3317 tree.pos(), site, sym.name, true);
3318 }
3319 }
3320 if (!allowStaticInterfaceMethods && sitesym.isInterface() &&
3321 sym.isStatic() && sym.kind == MTH) {
3322 log.error(tree.pos(), "static.intf.method.invoke.not.supported.in.source", sourceName);
3323 }
3324 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3325 // If the qualified item is not a type and the selected item is static, report
3326 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3327 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3328 }
3330 // If we are selecting an instance member via a `super', ...
3331 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3333 // Check that super-qualified symbols are not abstract (JLS)
3334 rs.checkNonAbstract(tree.pos(), sym);
3336 if (site.isRaw()) {
3337 // Determine argument types for site.
3338 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3339 if (site1 != null) site = site1;
3340 }
3341 }
3343 if (env.info.isSerializable) {
3344 chk.checkElemAccessFromSerializableLambda(tree);
3345 }
3347 env.info.selectSuper = selectSuperPrev;
3348 result = checkId(tree, site, sym, env, resultInfo);
3349 }
3350 //where
3351 /** Determine symbol referenced by a Select expression,
3352 *
3353 * @param tree The select tree.
3354 * @param site The type of the selected expression,
3355 * @param env The current environment.
3356 * @param resultInfo The current result.
3357 */
3358 private Symbol selectSym(JCFieldAccess tree,
3359 Symbol location,
3360 Type site,
3361 Env<AttrContext> env,
3362 ResultInfo resultInfo) {
3363 DiagnosticPosition pos = tree.pos();
3364 Name name = tree.name;
3365 switch (site.getTag()) {
3366 case PACKAGE:
3367 return rs.accessBase(
3368 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3369 pos, location, site, name, true);
3370 case ARRAY:
3371 case CLASS:
3372 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3373 return rs.resolveQualifiedMethod(
3374 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3375 } else if (name == names._this || name == names._super) {
3376 return rs.resolveSelf(pos, env, site.tsym, name);
3377 } else if (name == names._class) {
3378 // In this case, we have already made sure in
3379 // visitSelect that qualifier expression is a type.
3380 Type t = syms.classType;
3381 List<Type> typeargs = allowGenerics
3382 ? List.of(types.erasure(site))
3383 : List.<Type>nil();
3384 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3385 return new VarSymbol(
3386 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3387 } else {
3388 // We are seeing a plain identifier as selector.
3389 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3390 if ((resultInfo.pkind & ERRONEOUS) == 0)
3391 sym = rs.accessBase(sym, pos, location, site, name, true);
3392 return sym;
3393 }
3394 case WILDCARD:
3395 throw new AssertionError(tree);
3396 case TYPEVAR:
3397 // Normally, site.getUpperBound() shouldn't be null.
3398 // It should only happen during memberEnter/attribBase
3399 // when determining the super type which *must* beac
3400 // done before attributing the type variables. In
3401 // other words, we are seeing this illegal program:
3402 // class B<T> extends A<T.foo> {}
3403 Symbol sym = (site.getUpperBound() != null)
3404 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3405 : null;
3406 if (sym == null) {
3407 log.error(pos, "type.var.cant.be.deref");
3408 return syms.errSymbol;
3409 } else {
3410 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3411 rs.new AccessError(env, site, sym) :
3412 sym;
3413 rs.accessBase(sym2, pos, location, site, name, true);
3414 return sym;
3415 }
3416 case ERROR:
3417 // preserve identifier names through errors
3418 return types.createErrorType(name, site.tsym, site).tsym;
3419 default:
3420 // The qualifier expression is of a primitive type -- only
3421 // .class is allowed for these.
3422 if (name == names._class) {
3423 // In this case, we have already made sure in Select that
3424 // qualifier expression is a type.
3425 Type t = syms.classType;
3426 Type arg = types.boxedClass(site).type;
3427 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3428 return new VarSymbol(
3429 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3430 } else {
3431 log.error(pos, "cant.deref", site);
3432 return syms.errSymbol;
3433 }
3434 }
3435 }
3437 /** Determine type of identifier or select expression and check that
3438 * (1) the referenced symbol is not deprecated
3439 * (2) the symbol's type is safe (@see checkSafe)
3440 * (3) if symbol is a variable, check that its type and kind are
3441 * compatible with the prototype and protokind.
3442 * (4) if symbol is an instance field of a raw type,
3443 * which is being assigned to, issue an unchecked warning if its
3444 * type changes under erasure.
3445 * (5) if symbol is an instance method of a raw type, issue an
3446 * unchecked warning if its argument types change under erasure.
3447 * If checks succeed:
3448 * If symbol is a constant, return its constant type
3449 * else if symbol is a method, return its result type
3450 * otherwise return its type.
3451 * Otherwise return errType.
3452 *
3453 * @param tree The syntax tree representing the identifier
3454 * @param site If this is a select, the type of the selected
3455 * expression, otherwise the type of the current class.
3456 * @param sym The symbol representing the identifier.
3457 * @param env The current environment.
3458 * @param resultInfo The expected result
3459 */
3460 Type checkId(JCTree tree,
3461 Type site,
3462 Symbol sym,
3463 Env<AttrContext> env,
3464 ResultInfo resultInfo) {
3465 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3466 checkMethodId(tree, site, sym, env, resultInfo) :
3467 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3468 }
3470 Type checkMethodId(JCTree tree,
3471 Type site,
3472 Symbol sym,
3473 Env<AttrContext> env,
3474 ResultInfo resultInfo) {
3475 boolean isPolymorhicSignature =
3476 (sym.baseSymbol().flags() & SIGNATURE_POLYMORPHIC) != 0;
3477 return isPolymorhicSignature ?
3478 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3479 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3480 }
3482 Type checkSigPolyMethodId(JCTree tree,
3483 Type site,
3484 Symbol sym,
3485 Env<AttrContext> env,
3486 ResultInfo resultInfo) {
3487 //recover original symbol for signature polymorphic methods
3488 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3489 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3490 return sym.type;
3491 }
3493 Type checkMethodIdInternal(JCTree tree,
3494 Type site,
3495 Symbol sym,
3496 Env<AttrContext> env,
3497 ResultInfo resultInfo) {
3498 if ((resultInfo.pkind & POLY) != 0) {
3499 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3500 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3501 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3502 return owntype;
3503 } else {
3504 return checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3505 }
3506 }
3508 Type checkIdInternal(JCTree tree,
3509 Type site,
3510 Symbol sym,
3511 Type pt,
3512 Env<AttrContext> env,
3513 ResultInfo resultInfo) {
3514 if (pt.isErroneous()) {
3515 return types.createErrorType(site);
3516 }
3517 Type owntype; // The computed type of this identifier occurrence.
3518 switch (sym.kind) {
3519 case TYP:
3520 // For types, the computed type equals the symbol's type,
3521 // except for two situations:
3522 owntype = sym.type;
3523 if (owntype.hasTag(CLASS)) {
3524 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3525 Type ownOuter = owntype.getEnclosingType();
3527 // (a) If the symbol's type is parameterized, erase it
3528 // because no type parameters were given.
3529 // We recover generic outer type later in visitTypeApply.
3530 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3531 owntype = types.erasure(owntype);
3532 }
3534 // (b) If the symbol's type is an inner class, then
3535 // we have to interpret its outer type as a superclass
3536 // of the site type. Example:
3537 //
3538 // class Tree<A> { class Visitor { ... } }
3539 // class PointTree extends Tree<Point> { ... }
3540 // ...PointTree.Visitor...
3541 //
3542 // Then the type of the last expression above is
3543 // Tree<Point>.Visitor.
3544 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3545 Type normOuter = site;
3546 if (normOuter.hasTag(CLASS)) {
3547 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3548 }
3549 if (normOuter == null) // perhaps from an import
3550 normOuter = types.erasure(ownOuter);
3551 if (normOuter != ownOuter)
3552 owntype = new ClassType(
3553 normOuter, List.<Type>nil(), owntype.tsym);
3554 }
3555 }
3556 break;
3557 case VAR:
3558 VarSymbol v = (VarSymbol)sym;
3559 // Test (4): if symbol is an instance field of a raw type,
3560 // which is being assigned to, issue an unchecked warning if
3561 // its type changes under erasure.
3562 if (allowGenerics &&
3563 resultInfo.pkind == VAR &&
3564 v.owner.kind == TYP &&
3565 (v.flags() & STATIC) == 0 &&
3566 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3567 Type s = types.asOuterSuper(site, v.owner);
3568 if (s != null &&
3569 s.isRaw() &&
3570 !types.isSameType(v.type, v.erasure(types))) {
3571 chk.warnUnchecked(tree.pos(),
3572 "unchecked.assign.to.var",
3573 v, s);
3574 }
3575 }
3576 // The computed type of a variable is the type of the
3577 // variable symbol, taken as a member of the site type.
3578 owntype = (sym.owner.kind == TYP &&
3579 sym.name != names._this && sym.name != names._super)
3580 ? types.memberType(site, sym)
3581 : sym.type;
3583 // If the variable is a constant, record constant value in
3584 // computed type.
3585 if (v.getConstValue() != null && isStaticReference(tree))
3586 owntype = owntype.constType(v.getConstValue());
3588 if (resultInfo.pkind == VAL) {
3589 owntype = capture(owntype); // capture "names as expressions"
3590 }
3591 break;
3592 case MTH: {
3593 owntype = checkMethod(site, sym,
3594 new ResultInfo(resultInfo.pkind, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3595 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3596 resultInfo.pt.getTypeArguments());
3597 break;
3598 }
3599 case PCK: case ERR:
3600 owntype = sym.type;
3601 break;
3602 default:
3603 throw new AssertionError("unexpected kind: " + sym.kind +
3604 " in tree " + tree);
3605 }
3607 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3608 // (for constructors, the error was given when the constructor was
3609 // resolved)
3611 if (sym.name != names.init) {
3612 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3613 chk.checkSunAPI(tree.pos(), sym);
3614 chk.checkProfile(tree.pos(), sym);
3615 }
3617 // Test (3): if symbol is a variable, check that its type and
3618 // kind are compatible with the prototype and protokind.
3619 return check(tree, owntype, sym.kind, resultInfo);
3620 }
3622 /** Check that variable is initialized and evaluate the variable's
3623 * initializer, if not yet done. Also check that variable is not
3624 * referenced before it is defined.
3625 * @param tree The tree making up the variable reference.
3626 * @param env The current environment.
3627 * @param v The variable's symbol.
3628 */
3629 private void checkInit(JCTree tree,
3630 Env<AttrContext> env,
3631 VarSymbol v,
3632 boolean onlyWarning) {
3633 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3634 // tree.pos + " " + v.pos + " " +
3635 // Resolve.isStatic(env));//DEBUG
3637 // A forward reference is diagnosed if the declaration position
3638 // of the variable is greater than the current tree position
3639 // and the tree and variable definition occur in the same class
3640 // definition. Note that writes don't count as references.
3641 // This check applies only to class and instance
3642 // variables. Local variables follow different scope rules,
3643 // and are subject to definite assignment checking.
3644 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3645 v.owner.kind == TYP &&
3646 enclosingInitEnv(env) != null &&
3647 v.owner == env.info.scope.owner.enclClass() &&
3648 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3649 (!env.tree.hasTag(ASSIGN) ||
3650 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3651 String suffix = (env.info.enclVar == v) ?
3652 "self.ref" : "forward.ref";
3653 if (!onlyWarning || isStaticEnumField(v)) {
3654 log.error(tree.pos(), "illegal." + suffix);
3655 } else if (useBeforeDeclarationWarning) {
3656 log.warning(tree.pos(), suffix, v);
3657 }
3658 }
3660 v.getConstValue(); // ensure initializer is evaluated
3662 checkEnumInitializer(tree, env, v);
3663 }
3665 /**
3666 * Returns the enclosing init environment associated with this env (if any). An init env
3667 * can be either a field declaration env or a static/instance initializer env.
3668 */
3669 Env<AttrContext> enclosingInitEnv(Env<AttrContext> env) {
3670 while (true) {
3671 switch (env.tree.getTag()) {
3672 case VARDEF:
3673 JCVariableDecl vdecl = (JCVariableDecl)env.tree;
3674 if (vdecl.sym.owner.kind == TYP) {
3675 //field
3676 return env;
3677 }
3678 break;
3679 case BLOCK:
3680 if (env.next.tree.hasTag(CLASSDEF)) {
3681 //instance/static initializer
3682 return env;
3683 }
3684 break;
3685 case METHODDEF:
3686 case CLASSDEF:
3687 case TOPLEVEL:
3688 return null;
3689 }
3690 Assert.checkNonNull(env.next);
3691 env = env.next;
3692 }
3693 }
3695 /**
3696 * Check for illegal references to static members of enum. In
3697 * an enum type, constructors and initializers may not
3698 * reference its static members unless they are constant.
3699 *
3700 * @param tree The tree making up the variable reference.
3701 * @param env The current environment.
3702 * @param v The variable's symbol.
3703 * @jls section 8.9 Enums
3704 */
3705 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3706 // JLS:
3707 //
3708 // "It is a compile-time error to reference a static field
3709 // of an enum type that is not a compile-time constant
3710 // (15.28) from constructors, instance initializer blocks,
3711 // or instance variable initializer expressions of that
3712 // type. It is a compile-time error for the constructors,
3713 // instance initializer blocks, or instance variable
3714 // initializer expressions of an enum constant e to refer
3715 // to itself or to an enum constant of the same type that
3716 // is declared to the right of e."
3717 if (isStaticEnumField(v)) {
3718 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3720 if (enclClass == null || enclClass.owner == null)
3721 return;
3723 // See if the enclosing class is the enum (or a
3724 // subclass thereof) declaring v. If not, this
3725 // reference is OK.
3726 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3727 return;
3729 // If the reference isn't from an initializer, then
3730 // the reference is OK.
3731 if (!Resolve.isInitializer(env))
3732 return;
3734 log.error(tree.pos(), "illegal.enum.static.ref");
3735 }
3736 }
3738 /** Is the given symbol a static, non-constant field of an Enum?
3739 * Note: enum literals should not be regarded as such
3740 */
3741 private boolean isStaticEnumField(VarSymbol v) {
3742 return Flags.isEnum(v.owner) &&
3743 Flags.isStatic(v) &&
3744 !Flags.isConstant(v) &&
3745 v.name != names._class;
3746 }
3748 Warner noteWarner = new Warner();
3750 /**
3751 * Check that method arguments conform to its instantiation.
3752 **/
3753 public Type checkMethod(Type site,
3754 final Symbol sym,
3755 ResultInfo resultInfo,
3756 Env<AttrContext> env,
3757 final List<JCExpression> argtrees,
3758 List<Type> argtypes,
3759 List<Type> typeargtypes) {
3760 // Test (5): if symbol is an instance method of a raw type, issue
3761 // an unchecked warning if its argument types change under erasure.
3762 if (allowGenerics &&
3763 (sym.flags() & STATIC) == 0 &&
3764 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3765 Type s = types.asOuterSuper(site, sym.owner);
3766 if (s != null && s.isRaw() &&
3767 !types.isSameTypes(sym.type.getParameterTypes(),
3768 sym.erasure(types).getParameterTypes())) {
3769 chk.warnUnchecked(env.tree.pos(),
3770 "unchecked.call.mbr.of.raw.type",
3771 sym, s);
3772 }
3773 }
3775 if (env.info.defaultSuperCallSite != null) {
3776 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3777 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3778 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3779 List<MethodSymbol> icand_sup =
3780 types.interfaceCandidates(sup, (MethodSymbol)sym);
3781 if (icand_sup.nonEmpty() &&
3782 icand_sup.head != sym &&
3783 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3784 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3785 diags.fragment("overridden.default", sym, sup));
3786 break;
3787 }
3788 }
3789 env.info.defaultSuperCallSite = null;
3790 }
3792 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3793 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3794 if (app.meth.hasTag(SELECT) &&
3795 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3796 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3797 }
3798 }
3800 // Compute the identifier's instantiated type.
3801 // For methods, we need to compute the instance type by
3802 // Resolve.instantiate from the symbol's type as well as
3803 // any type arguments and value arguments.
3804 noteWarner.clear();
3805 try {
3806 Type owntype = rs.checkMethod(
3807 env,
3808 site,
3809 sym,
3810 resultInfo,
3811 argtypes,
3812 typeargtypes,
3813 noteWarner);
3815 DeferredAttr.DeferredTypeMap checkDeferredMap =
3816 deferredAttr.new DeferredTypeMap(DeferredAttr.AttrMode.CHECK, sym, env.info.pendingResolutionPhase);
3818 argtypes = Type.map(argtypes, checkDeferredMap);
3820 if (noteWarner.hasNonSilentLint(LintCategory.UNCHECKED)) {
3821 chk.warnUnchecked(env.tree.pos(),
3822 "unchecked.meth.invocation.applied",
3823 kindName(sym),
3824 sym.name,
3825 rs.methodArguments(sym.type.getParameterTypes()),
3826 rs.methodArguments(Type.map(argtypes, checkDeferredMap)),
3827 kindName(sym.location()),
3828 sym.location());
3829 owntype = new MethodType(owntype.getParameterTypes(),
3830 types.erasure(owntype.getReturnType()),
3831 types.erasure(owntype.getThrownTypes()),
3832 syms.methodClass);
3833 }
3835 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3836 resultInfo.checkContext.inferenceContext());
3837 } catch (Infer.InferenceException ex) {
3838 //invalid target type - propagate exception outwards or report error
3839 //depending on the current check context
3840 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3841 return types.createErrorType(site);
3842 } catch (Resolve.InapplicableMethodException ex) {
3843 final JCDiagnostic diag = ex.getDiagnostic();
3844 Resolve.InapplicableSymbolError errSym = rs.new InapplicableSymbolError(null) {
3845 @Override
3846 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3847 return new Pair<Symbol, JCDiagnostic>(sym, diag);
3848 }
3849 };
3850 List<Type> argtypes2 = Type.map(argtypes,
3851 rs.new ResolveDeferredRecoveryMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3852 JCDiagnostic errDiag = errSym.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3853 env.tree, sym, site, sym.name, argtypes2, typeargtypes);
3854 log.report(errDiag);
3855 return types.createErrorType(site);
3856 }
3857 }
3859 public void visitLiteral(JCLiteral tree) {
3860 result = check(
3861 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3862 }
3863 //where
3864 /** Return the type of a literal with given type tag.
3865 */
3866 Type litType(TypeTag tag) {
3867 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3868 }
3870 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3871 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3872 }
3874 public void visitTypeArray(JCArrayTypeTree tree) {
3875 Type etype = attribType(tree.elemtype, env);
3876 Type type = new ArrayType(etype, syms.arrayClass);
3877 result = check(tree, type, TYP, resultInfo);
3878 }
3880 /** Visitor method for parameterized types.
3881 * Bound checking is left until later, since types are attributed
3882 * before supertype structure is completely known
3883 */
3884 public void visitTypeApply(JCTypeApply tree) {
3885 Type owntype = types.createErrorType(tree.type);
3887 // Attribute functor part of application and make sure it's a class.
3888 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3890 // Attribute type parameters
3891 List<Type> actuals = attribTypes(tree.arguments, env);
3893 if (clazztype.hasTag(CLASS)) {
3894 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3895 if (actuals.isEmpty()) //diamond
3896 actuals = formals;
3898 if (actuals.length() == formals.length()) {
3899 List<Type> a = actuals;
3900 List<Type> f = formals;
3901 while (a.nonEmpty()) {
3902 a.head = a.head.withTypeVar(f.head);
3903 a = a.tail;
3904 f = f.tail;
3905 }
3906 // Compute the proper generic outer
3907 Type clazzOuter = clazztype.getEnclosingType();
3908 if (clazzOuter.hasTag(CLASS)) {
3909 Type site;
3910 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3911 if (clazz.hasTag(IDENT)) {
3912 site = env.enclClass.sym.type;
3913 } else if (clazz.hasTag(SELECT)) {
3914 site = ((JCFieldAccess) clazz).selected.type;
3915 } else throw new AssertionError(""+tree);
3916 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3917 if (site.hasTag(CLASS))
3918 site = types.asOuterSuper(site, clazzOuter.tsym);
3919 if (site == null)
3920 site = types.erasure(clazzOuter);
3921 clazzOuter = site;
3922 }
3923 }
3924 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3925 } else {
3926 if (formals.length() != 0) {
3927 log.error(tree.pos(), "wrong.number.type.args",
3928 Integer.toString(formals.length()));
3929 } else {
3930 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3931 }
3932 owntype = types.createErrorType(tree.type);
3933 }
3934 }
3935 result = check(tree, owntype, TYP, resultInfo);
3936 }
3938 public void visitTypeUnion(JCTypeUnion tree) {
3939 ListBuffer<Type> multicatchTypes = new ListBuffer<>();
3940 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3941 for (JCExpression typeTree : tree.alternatives) {
3942 Type ctype = attribType(typeTree, env);
3943 ctype = chk.checkType(typeTree.pos(),
3944 chk.checkClassType(typeTree.pos(), ctype),
3945 syms.throwableType);
3946 if (!ctype.isErroneous()) {
3947 //check that alternatives of a union type are pairwise
3948 //unrelated w.r.t. subtyping
3949 if (chk.intersects(ctype, multicatchTypes.toList())) {
3950 for (Type t : multicatchTypes) {
3951 boolean sub = types.isSubtype(ctype, t);
3952 boolean sup = types.isSubtype(t, ctype);
3953 if (sub || sup) {
3954 //assume 'a' <: 'b'
3955 Type a = sub ? ctype : t;
3956 Type b = sub ? t : ctype;
3957 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3958 }
3959 }
3960 }
3961 multicatchTypes.append(ctype);
3962 if (all_multicatchTypes != null)
3963 all_multicatchTypes.append(ctype);
3964 } else {
3965 if (all_multicatchTypes == null) {
3966 all_multicatchTypes = new ListBuffer<>();
3967 all_multicatchTypes.appendList(multicatchTypes);
3968 }
3969 all_multicatchTypes.append(ctype);
3970 }
3971 }
3972 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3973 if (t.hasTag(CLASS)) {
3974 List<Type> alternatives =
3975 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3976 t = new UnionClassType((ClassType) t, alternatives);
3977 }
3978 tree.type = result = t;
3979 }
3981 public void visitTypeIntersection(JCTypeIntersection tree) {
3982 attribTypes(tree.bounds, env);
3983 tree.type = result = checkIntersection(tree, tree.bounds);
3984 }
3986 public void visitTypeParameter(JCTypeParameter tree) {
3987 TypeVar typeVar = (TypeVar) tree.type;
3989 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3990 annotateType(tree, tree.annotations);
3991 }
3993 if (!typeVar.bound.isErroneous()) {
3994 //fixup type-parameter bound computed in 'attribTypeVariables'
3995 typeVar.bound = checkIntersection(tree, tree.bounds);
3996 }
3997 }
3999 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
4000 Set<Type> boundSet = new HashSet<Type>();
4001 if (bounds.nonEmpty()) {
4002 // accept class or interface or typevar as first bound.
4003 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
4004 boundSet.add(types.erasure(bounds.head.type));
4005 if (bounds.head.type.isErroneous()) {
4006 return bounds.head.type;
4007 }
4008 else if (bounds.head.type.hasTag(TYPEVAR)) {
4009 // if first bound was a typevar, do not accept further bounds.
4010 if (bounds.tail.nonEmpty()) {
4011 log.error(bounds.tail.head.pos(),
4012 "type.var.may.not.be.followed.by.other.bounds");
4013 return bounds.head.type;
4014 }
4015 } else {
4016 // if first bound was a class or interface, accept only interfaces
4017 // as further bounds.
4018 for (JCExpression bound : bounds.tail) {
4019 bound.type = checkBase(bound.type, bound, env, false, true, false);
4020 if (bound.type.isErroneous()) {
4021 bounds = List.of(bound);
4022 }
4023 else if (bound.type.hasTag(CLASS)) {
4024 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
4025 }
4026 }
4027 }
4028 }
4030 if (bounds.length() == 0) {
4031 return syms.objectType;
4032 } else if (bounds.length() == 1) {
4033 return bounds.head.type;
4034 } else {
4035 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
4036 // ... the variable's bound is a class type flagged COMPOUND
4037 // (see comment for TypeVar.bound).
4038 // In this case, generate a class tree that represents the
4039 // bound class, ...
4040 JCExpression extending;
4041 List<JCExpression> implementing;
4042 if (!bounds.head.type.isInterface()) {
4043 extending = bounds.head;
4044 implementing = bounds.tail;
4045 } else {
4046 extending = null;
4047 implementing = bounds;
4048 }
4049 JCClassDecl cd = make.at(tree).ClassDef(
4050 make.Modifiers(PUBLIC | ABSTRACT),
4051 names.empty, List.<JCTypeParameter>nil(),
4052 extending, implementing, List.<JCTree>nil());
4054 ClassSymbol c = (ClassSymbol)owntype.tsym;
4055 Assert.check((c.flags() & COMPOUND) != 0);
4056 cd.sym = c;
4057 c.sourcefile = env.toplevel.sourcefile;
4059 // ... and attribute the bound class
4060 c.flags_field |= UNATTRIBUTED;
4061 Env<AttrContext> cenv = enter.classEnv(cd, env);
4062 typeEnvs.put(c, cenv);
4063 attribClass(c);
4064 return owntype;
4065 }
4066 }
4068 public void visitWildcard(JCWildcard tree) {
4069 //- System.err.println("visitWildcard("+tree+");");//DEBUG
4070 Type type = (tree.kind.kind == BoundKind.UNBOUND)
4071 ? syms.objectType
4072 : attribType(tree.inner, env);
4073 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
4074 tree.kind.kind,
4075 syms.boundClass),
4076 TYP, resultInfo);
4077 }
4079 public void visitAnnotation(JCAnnotation tree) {
4080 Assert.error("should be handled in Annotate");
4081 }
4083 public void visitAnnotatedType(JCAnnotatedType tree) {
4084 Type underlyingType = attribType(tree.getUnderlyingType(), env);
4085 this.attribAnnotationTypes(tree.annotations, env);
4086 annotateType(tree, tree.annotations);
4087 result = tree.type = underlyingType;
4088 }
4090 /**
4091 * Apply the annotations to the particular type.
4092 */
4093 public void annotateType(final JCTree tree, final List<JCAnnotation> annotations) {
4094 annotate.typeAnnotation(new Annotate.Worker() {
4095 @Override
4096 public String toString() {
4097 return "annotate " + annotations + " onto " + tree;
4098 }
4099 @Override
4100 public void run() {
4101 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4102 if (annotations.size() == compounds.size()) {
4103 // All annotations were successfully converted into compounds
4104 tree.type = tree.type.unannotatedType().annotatedType(compounds);
4105 }
4106 }
4107 });
4108 }
4110 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4111 if (annotations.isEmpty()) {
4112 return List.nil();
4113 }
4115 ListBuffer<Attribute.TypeCompound> buf = new ListBuffer<>();
4116 for (JCAnnotation anno : annotations) {
4117 if (anno.attribute != null) {
4118 // TODO: this null-check is only needed for an obscure
4119 // ordering issue, where annotate.flush is called when
4120 // the attribute is not set yet. For an example failure
4121 // try the referenceinfos/NestedTypes.java test.
4122 // Any better solutions?
4123 buf.append((Attribute.TypeCompound) anno.attribute);
4124 }
4125 // Eventually we will want to throw an exception here, but
4126 // we can't do that just yet, because it gets triggered
4127 // when attempting to attach an annotation that isn't
4128 // defined.
4129 }
4130 return buf.toList();
4131 }
4133 public void visitErroneous(JCErroneous tree) {
4134 if (tree.errs != null)
4135 for (JCTree err : tree.errs)
4136 attribTree(err, env, new ResultInfo(ERR, pt()));
4137 result = tree.type = syms.errType;
4138 }
4140 /** Default visitor method for all other trees.
4141 */
4142 public void visitTree(JCTree tree) {
4143 throw new AssertionError();
4144 }
4146 /**
4147 * Attribute an env for either a top level tree or class declaration.
4148 */
4149 public void attrib(Env<AttrContext> env) {
4150 if (env.tree.hasTag(TOPLEVEL))
4151 attribTopLevel(env);
4152 else
4153 attribClass(env.tree.pos(), env.enclClass.sym);
4154 }
4156 /**
4157 * Attribute a top level tree. These trees are encountered when the
4158 * package declaration has annotations.
4159 */
4160 public void attribTopLevel(Env<AttrContext> env) {
4161 JCCompilationUnit toplevel = env.toplevel;
4162 try {
4163 annotate.flush();
4164 } catch (CompletionFailure ex) {
4165 chk.completionError(toplevel.pos(), ex);
4166 }
4167 }
4169 /** Main method: attribute class definition associated with given class symbol.
4170 * reporting completion failures at the given position.
4171 * @param pos The source position at which completion errors are to be
4172 * reported.
4173 * @param c The class symbol whose definition will be attributed.
4174 */
4175 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4176 try {
4177 annotate.flush();
4178 attribClass(c);
4179 } catch (CompletionFailure ex) {
4180 chk.completionError(pos, ex);
4181 }
4182 }
4184 /** Attribute class definition associated with given class symbol.
4185 * @param c The class symbol whose definition will be attributed.
4186 */
4187 void attribClass(ClassSymbol c) throws CompletionFailure {
4188 if (c.type.hasTag(ERROR)) return;
4190 // Check for cycles in the inheritance graph, which can arise from
4191 // ill-formed class files.
4192 chk.checkNonCyclic(null, c.type);
4194 Type st = types.supertype(c.type);
4195 if ((c.flags_field & Flags.COMPOUND) == 0) {
4196 // First, attribute superclass.
4197 if (st.hasTag(CLASS))
4198 attribClass((ClassSymbol)st.tsym);
4200 // Next attribute owner, if it is a class.
4201 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4202 attribClass((ClassSymbol)c.owner);
4203 }
4205 // The previous operations might have attributed the current class
4206 // if there was a cycle. So we test first whether the class is still
4207 // UNATTRIBUTED.
4208 if ((c.flags_field & UNATTRIBUTED) != 0) {
4209 c.flags_field &= ~UNATTRIBUTED;
4211 // Get environment current at the point of class definition.
4212 Env<AttrContext> env = typeEnvs.get(c);
4214 // The info.lint field in the envs stored in typeEnvs is deliberately uninitialized,
4215 // because the annotations were not available at the time the env was created. Therefore,
4216 // we look up the environment chain for the first enclosing environment for which the
4217 // lint value is set. Typically, this is the parent env, but might be further if there
4218 // are any envs created as a result of TypeParameter nodes.
4219 Env<AttrContext> lintEnv = env;
4220 while (lintEnv.info.lint == null)
4221 lintEnv = lintEnv.next;
4223 // Having found the enclosing lint value, we can initialize the lint value for this class
4224 env.info.lint = lintEnv.info.lint.augment(c);
4226 Lint prevLint = chk.setLint(env.info.lint);
4227 JavaFileObject prev = log.useSource(c.sourcefile);
4228 ResultInfo prevReturnRes = env.info.returnResult;
4230 try {
4231 deferredLintHandler.flush(env.tree);
4232 env.info.returnResult = null;
4233 // java.lang.Enum may not be subclassed by a non-enum
4234 if (st.tsym == syms.enumSym &&
4235 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4236 log.error(env.tree.pos(), "enum.no.subclassing");
4238 // Enums may not be extended by source-level classes
4239 if (st.tsym != null &&
4240 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4241 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4242 log.error(env.tree.pos(), "enum.types.not.extensible");
4243 }
4245 if (isSerializable(c.type)) {
4246 env.info.isSerializable = true;
4247 }
4249 attribClassBody(env, c);
4251 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4252 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4253 chk.checkFunctionalInterface((JCClassDecl) env.tree, c);
4254 } finally {
4255 env.info.returnResult = prevReturnRes;
4256 log.useSource(prev);
4257 chk.setLint(prevLint);
4258 }
4260 }
4261 }
4263 public void visitImport(JCImport tree) {
4264 // nothing to do
4265 }
4267 /** Finish the attribution of a class. */
4268 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4269 JCClassDecl tree = (JCClassDecl)env.tree;
4270 Assert.check(c == tree.sym);
4272 // Validate type parameters, supertype and interfaces.
4273 attribStats(tree.typarams, env);
4274 if (!c.isAnonymous()) {
4275 //already checked if anonymous
4276 chk.validate(tree.typarams, env);
4277 chk.validate(tree.extending, env);
4278 chk.validate(tree.implementing, env);
4279 }
4281 c.markAbstractIfNeeded(types);
4283 // If this is a non-abstract class, check that it has no abstract
4284 // methods or unimplemented methods of an implemented interface.
4285 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4286 if (!relax)
4287 chk.checkAllDefined(tree.pos(), c);
4288 }
4290 if ((c.flags() & ANNOTATION) != 0) {
4291 if (tree.implementing.nonEmpty())
4292 log.error(tree.implementing.head.pos(),
4293 "cant.extend.intf.annotation");
4294 if (tree.typarams.nonEmpty())
4295 log.error(tree.typarams.head.pos(),
4296 "intf.annotation.cant.have.type.params");
4298 // If this annotation has a @Repeatable, validate
4299 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4300 if (repeatable != null) {
4301 // get diagnostic position for error reporting
4302 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4303 Assert.checkNonNull(cbPos);
4305 chk.validateRepeatable(c, repeatable, cbPos);
4306 }
4307 } else {
4308 // Check that all extended classes and interfaces
4309 // are compatible (i.e. no two define methods with same arguments
4310 // yet different return types). (JLS 8.4.6.3)
4311 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4312 if (allowDefaultMethods) {
4313 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4314 }
4315 }
4317 // Check that class does not import the same parameterized interface
4318 // with two different argument lists.
4319 chk.checkClassBounds(tree.pos(), c.type);
4321 tree.type = c.type;
4323 for (List<JCTypeParameter> l = tree.typarams;
4324 l.nonEmpty(); l = l.tail) {
4325 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4326 }
4328 // Check that a generic class doesn't extend Throwable
4329 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4330 log.error(tree.extending.pos(), "generic.throwable");
4332 // Check that all methods which implement some
4333 // method conform to the method they implement.
4334 chk.checkImplementations(tree);
4336 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4337 checkAutoCloseable(tree.pos(), env, c.type);
4339 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4340 // Attribute declaration
4341 attribStat(l.head, env);
4342 // Check that declarations in inner classes are not static (JLS 8.1.2)
4343 // Make an exception for static constants.
4344 if (c.owner.kind != PCK &&
4345 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4346 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4347 Symbol sym = null;
4348 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4349 if (sym == null ||
4350 sym.kind != VAR ||
4351 ((VarSymbol) sym).getConstValue() == null)
4352 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4353 }
4354 }
4356 // Check for cycles among non-initial constructors.
4357 chk.checkCyclicConstructors(tree);
4359 // Check for cycles among annotation elements.
4360 chk.checkNonCyclicElements(tree);
4362 // Check for proper use of serialVersionUID
4363 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4364 isSerializable(c.type) &&
4365 (c.flags() & Flags.ENUM) == 0 &&
4366 checkForSerial(c)) {
4367 checkSerialVersionUID(tree, c);
4368 }
4369 if (allowTypeAnnos) {
4370 // Correctly organize the postions of the type annotations
4371 typeAnnotations.organizeTypeAnnotationsBodies(tree);
4373 // Check type annotations applicability rules
4374 validateTypeAnnotations(tree, false);
4375 }
4376 }
4377 // where
4378 boolean checkForSerial(ClassSymbol c) {
4379 if ((c.flags() & ABSTRACT) == 0) {
4380 return true;
4381 } else {
4382 return c.members().anyMatch(anyNonAbstractOrDefaultMethod);
4383 }
4384 }
4386 public static final Filter<Symbol> anyNonAbstractOrDefaultMethod = new Filter<Symbol>() {
4387 @Override
4388 public boolean accepts(Symbol s) {
4389 return s.kind == Kinds.MTH &&
4390 (s.flags() & (DEFAULT | ABSTRACT)) != ABSTRACT;
4391 }
4392 };
4394 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4395 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4396 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4397 if (types.isSameType(al.head.annotationType.type, t))
4398 return al.head.pos();
4399 }
4401 return null;
4402 }
4404 /** check if a type is a subtype of Serializable, if that is available. */
4405 boolean isSerializable(Type t) {
4406 try {
4407 syms.serializableType.complete();
4408 }
4409 catch (CompletionFailure e) {
4410 return false;
4411 }
4412 return types.isSubtype(t, syms.serializableType);
4413 }
4415 /** Check that an appropriate serialVersionUID member is defined. */
4416 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4418 // check for presence of serialVersionUID
4419 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4420 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4421 if (e.scope == null) {
4422 log.warning(LintCategory.SERIAL,
4423 tree.pos(), "missing.SVUID", c);
4424 return;
4425 }
4427 // check that it is static final
4428 VarSymbol svuid = (VarSymbol)e.sym;
4429 if ((svuid.flags() & (STATIC | FINAL)) !=
4430 (STATIC | FINAL))
4431 log.warning(LintCategory.SERIAL,
4432 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4434 // check that it is long
4435 else if (!svuid.type.hasTag(LONG))
4436 log.warning(LintCategory.SERIAL,
4437 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4439 // check constant
4440 else if (svuid.getConstValue() == null)
4441 log.warning(LintCategory.SERIAL,
4442 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4443 }
4445 private Type capture(Type type) {
4446 return types.capture(type);
4447 }
4449 public void validateTypeAnnotations(JCTree tree, boolean sigOnly) {
4450 tree.accept(new TypeAnnotationsValidator(sigOnly));
4451 }
4452 //where
4453 private final class TypeAnnotationsValidator extends TreeScanner {
4455 private final boolean sigOnly;
4456 public TypeAnnotationsValidator(boolean sigOnly) {
4457 this.sigOnly = sigOnly;
4458 }
4460 public void visitAnnotation(JCAnnotation tree) {
4461 chk.validateTypeAnnotation(tree, false);
4462 super.visitAnnotation(tree);
4463 }
4464 public void visitAnnotatedType(JCAnnotatedType tree) {
4465 if (!tree.underlyingType.type.isErroneous()) {
4466 super.visitAnnotatedType(tree);
4467 }
4468 }
4469 public void visitTypeParameter(JCTypeParameter tree) {
4470 chk.validateTypeAnnotations(tree.annotations, true);
4471 scan(tree.bounds);
4472 // Don't call super.
4473 // This is needed because above we call validateTypeAnnotation with
4474 // false, which would forbid annotations on type parameters.
4475 // super.visitTypeParameter(tree);
4476 }
4477 public void visitMethodDef(JCMethodDecl tree) {
4478 if (tree.recvparam != null &&
4479 !tree.recvparam.vartype.type.isErroneous()) {
4480 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4481 tree.recvparam.vartype.type.tsym);
4482 }
4483 if (tree.restype != null && tree.restype.type != null) {
4484 validateAnnotatedType(tree.restype, tree.restype.type);
4485 }
4486 if (sigOnly) {
4487 scan(tree.mods);
4488 scan(tree.restype);
4489 scan(tree.typarams);
4490 scan(tree.recvparam);
4491 scan(tree.params);
4492 scan(tree.thrown);
4493 } else {
4494 scan(tree.defaultValue);
4495 scan(tree.body);
4496 }
4497 }
4498 public void visitVarDef(final JCVariableDecl tree) {
4499 if (tree.sym != null && tree.sym.type != null)
4500 validateAnnotatedType(tree.vartype, tree.sym.type);
4501 scan(tree.mods);
4502 scan(tree.vartype);
4503 if (!sigOnly) {
4504 scan(tree.init);
4505 }
4506 }
4507 public void visitTypeCast(JCTypeCast tree) {
4508 if (tree.clazz != null && tree.clazz.type != null)
4509 validateAnnotatedType(tree.clazz, tree.clazz.type);
4510 super.visitTypeCast(tree);
4511 }
4512 public void visitTypeTest(JCInstanceOf tree) {
4513 if (tree.clazz != null && tree.clazz.type != null)
4514 validateAnnotatedType(tree.clazz, tree.clazz.type);
4515 super.visitTypeTest(tree);
4516 }
4517 public void visitNewClass(JCNewClass tree) {
4518 if (tree.clazz != null && tree.clazz.type != null) {
4519 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4520 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
4521 tree.clazz.type.tsym);
4522 }
4523 if (tree.def != null) {
4524 checkForDeclarationAnnotations(tree.def.mods.annotations, tree.clazz.type.tsym);
4525 }
4527 validateAnnotatedType(tree.clazz, tree.clazz.type);
4528 }
4529 super.visitNewClass(tree);
4530 }
4531 public void visitNewArray(JCNewArray tree) {
4532 if (tree.elemtype != null && tree.elemtype.type != null) {
4533 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4534 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
4535 tree.elemtype.type.tsym);
4536 }
4537 validateAnnotatedType(tree.elemtype, tree.elemtype.type);
4538 }
4539 super.visitNewArray(tree);
4540 }
4541 public void visitClassDef(JCClassDecl tree) {
4542 if (sigOnly) {
4543 scan(tree.mods);
4544 scan(tree.typarams);
4545 scan(tree.extending);
4546 scan(tree.implementing);
4547 }
4548 for (JCTree member : tree.defs) {
4549 if (member.hasTag(Tag.CLASSDEF)) {
4550 continue;
4551 }
4552 scan(member);
4553 }
4554 }
4555 public void visitBlock(JCBlock tree) {
4556 if (!sigOnly) {
4557 scan(tree.stats);
4558 }
4559 }
4561 /* I would want to model this after
4562 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4563 * and override visitSelect and visitTypeApply.
4564 * However, we only set the annotated type in the top-level type
4565 * of the symbol.
4566 * Therefore, we need to override each individual location where a type
4567 * can occur.
4568 */
4569 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4570 // System.out.println("Attr.validateAnnotatedType: " + errtree + " type: " + type);
4572 if (type.isPrimitiveOrVoid()) {
4573 return;
4574 }
4576 JCTree enclTr = errtree;
4577 Type enclTy = type;
4579 boolean repeat = true;
4580 while (repeat) {
4581 if (enclTr.hasTag(TYPEAPPLY)) {
4582 List<Type> tyargs = enclTy.getTypeArguments();
4583 List<JCExpression> trargs = ((JCTypeApply)enclTr).getTypeArguments();
4584 if (trargs.length() > 0) {
4585 // Nothing to do for diamonds
4586 if (tyargs.length() == trargs.length()) {
4587 for (int i = 0; i < tyargs.length(); ++i) {
4588 validateAnnotatedType(trargs.get(i), tyargs.get(i));
4589 }
4590 }
4591 // If the lengths don't match, it's either a diamond
4592 // or some nested type that redundantly provides
4593 // type arguments in the tree.
4594 }
4596 // Look at the clazz part of a generic type
4597 enclTr = ((JCTree.JCTypeApply)enclTr).clazz;
4598 }
4600 if (enclTr.hasTag(SELECT)) {
4601 enclTr = ((JCTree.JCFieldAccess)enclTr).getExpression();
4602 if (enclTy != null &&
4603 !enclTy.hasTag(NONE)) {
4604 enclTy = enclTy.getEnclosingType();
4605 }
4606 } else if (enclTr.hasTag(ANNOTATED_TYPE)) {
4607 JCAnnotatedType at = (JCTree.JCAnnotatedType) enclTr;
4608 if (enclTy == null ||
4609 enclTy.hasTag(NONE)) {
4610 if (at.getAnnotations().size() == 1) {
4611 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping.1", at.getAnnotations().head.attribute);
4612 } else {
4613 ListBuffer<Attribute.Compound> comps = new ListBuffer<Attribute.Compound>();
4614 for (JCAnnotation an : at.getAnnotations()) {
4615 comps.add(an.attribute);
4616 }
4617 log.error(at.underlyingType.pos(), "cant.type.annotate.scoping", comps.toList());
4618 }
4619 repeat = false;
4620 }
4621 enclTr = at.underlyingType;
4622 // enclTy doesn't need to be changed
4623 } else if (enclTr.hasTag(IDENT)) {
4624 repeat = false;
4625 } else if (enclTr.hasTag(JCTree.Tag.WILDCARD)) {
4626 JCWildcard wc = (JCWildcard) enclTr;
4627 if (wc.getKind() == JCTree.Kind.EXTENDS_WILDCARD) {
4628 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getExtendsBound());
4629 } else if (wc.getKind() == JCTree.Kind.SUPER_WILDCARD) {
4630 validateAnnotatedType(wc.getBound(), ((WildcardType)enclTy.unannotatedType()).getSuperBound());
4631 } else {
4632 // Nothing to do for UNBOUND
4633 }
4634 repeat = false;
4635 } else if (enclTr.hasTag(TYPEARRAY)) {
4636 JCArrayTypeTree art = (JCArrayTypeTree) enclTr;
4637 validateAnnotatedType(art.getType(), ((ArrayType)enclTy.unannotatedType()).getComponentType());
4638 repeat = false;
4639 } else if (enclTr.hasTag(TYPEUNION)) {
4640 JCTypeUnion ut = (JCTypeUnion) enclTr;
4641 for (JCTree t : ut.getTypeAlternatives()) {
4642 validateAnnotatedType(t, t.type);
4643 }
4644 repeat = false;
4645 } else if (enclTr.hasTag(TYPEINTERSECTION)) {
4646 JCTypeIntersection it = (JCTypeIntersection) enclTr;
4647 for (JCTree t : it.getBounds()) {
4648 validateAnnotatedType(t, t.type);
4649 }
4650 repeat = false;
4651 } else if (enclTr.getKind() == JCTree.Kind.PRIMITIVE_TYPE ||
4652 enclTr.getKind() == JCTree.Kind.ERRONEOUS) {
4653 repeat = false;
4654 } else {
4655 Assert.error("Unexpected tree: " + enclTr + " with kind: " + enclTr.getKind() +
4656 " within: "+ errtree + " with kind: " + errtree.getKind());
4657 }
4658 }
4659 }
4661 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
4662 Symbol sym) {
4663 // Ensure that no declaration annotations are present.
4664 // Note that a tree type might be an AnnotatedType with
4665 // empty annotations, if only declaration annotations were given.
4666 // This method will raise an error for such a type.
4667 for (JCAnnotation ai : annotations) {
4668 if (!ai.type.isErroneous() &&
4669 typeAnnotations.annotationType(ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
4670 log.error(ai.pos(), "annotation.type.not.applicable");
4671 }
4672 }
4673 }
4674 };
4676 // <editor-fold desc="post-attribution visitor">
4678 /**
4679 * Handle missing types/symbols in an AST. This routine is useful when
4680 * the compiler has encountered some errors (which might have ended up
4681 * terminating attribution abruptly); if the compiler is used in fail-over
4682 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4683 * prevents NPE to be progagated during subsequent compilation steps.
4684 */
4685 public void postAttr(JCTree tree) {
4686 new PostAttrAnalyzer().scan(tree);
4687 }
4689 class PostAttrAnalyzer extends TreeScanner {
4691 private void initTypeIfNeeded(JCTree that) {
4692 if (that.type == null) {
4693 if (that.hasTag(METHODDEF)) {
4694 that.type = dummyMethodType((JCMethodDecl)that);
4695 } else {
4696 that.type = syms.unknownType;
4697 }
4698 }
4699 }
4701 /* Construct a dummy method type. If we have a method declaration,
4702 * and the declared return type is void, then use that return type
4703 * instead of UNKNOWN to avoid spurious error messages in lambda
4704 * bodies (see:JDK-8041704).
4705 */
4706 private Type dummyMethodType(JCMethodDecl md) {
4707 Type restype = syms.unknownType;
4708 if (md != null && md.restype.hasTag(TYPEIDENT)) {
4709 JCPrimitiveTypeTree prim = (JCPrimitiveTypeTree)md.restype;
4710 if (prim.typetag == VOID)
4711 restype = syms.voidType;
4712 }
4713 return new MethodType(List.<Type>nil(), restype,
4714 List.<Type>nil(), syms.methodClass);
4715 }
4716 private Type dummyMethodType() {
4717 return dummyMethodType(null);
4718 }
4720 @Override
4721 public void scan(JCTree tree) {
4722 if (tree == null) return;
4723 if (tree instanceof JCExpression) {
4724 initTypeIfNeeded(tree);
4725 }
4726 super.scan(tree);
4727 }
4729 @Override
4730 public void visitIdent(JCIdent that) {
4731 if (that.sym == null) {
4732 that.sym = syms.unknownSymbol;
4733 }
4734 }
4736 @Override
4737 public void visitSelect(JCFieldAccess that) {
4738 if (that.sym == null) {
4739 that.sym = syms.unknownSymbol;
4740 }
4741 super.visitSelect(that);
4742 }
4744 @Override
4745 public void visitClassDef(JCClassDecl that) {
4746 initTypeIfNeeded(that);
4747 if (that.sym == null) {
4748 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4749 }
4750 super.visitClassDef(that);
4751 }
4753 @Override
4754 public void visitMethodDef(JCMethodDecl that) {
4755 initTypeIfNeeded(that);
4756 if (that.sym == null) {
4757 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4758 }
4759 super.visitMethodDef(that);
4760 }
4762 @Override
4763 public void visitVarDef(JCVariableDecl that) {
4764 initTypeIfNeeded(that);
4765 if (that.sym == null) {
4766 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4767 that.sym.adr = 0;
4768 }
4769 super.visitVarDef(that);
4770 }
4772 @Override
4773 public void visitNewClass(JCNewClass that) {
4774 if (that.constructor == null) {
4775 that.constructor = new MethodSymbol(0, names.init,
4776 dummyMethodType(), syms.noSymbol);
4777 }
4778 if (that.constructorType == null) {
4779 that.constructorType = syms.unknownType;
4780 }
4781 super.visitNewClass(that);
4782 }
4784 @Override
4785 public void visitAssignop(JCAssignOp that) {
4786 if (that.operator == null) {
4787 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4788 -1, syms.noSymbol);
4789 }
4790 super.visitAssignop(that);
4791 }
4793 @Override
4794 public void visitBinary(JCBinary that) {
4795 if (that.operator == null) {
4796 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4797 -1, syms.noSymbol);
4798 }
4799 super.visitBinary(that);
4800 }
4802 @Override
4803 public void visitUnary(JCUnary that) {
4804 if (that.operator == null) {
4805 that.operator = new OperatorSymbol(names.empty, dummyMethodType(),
4806 -1, syms.noSymbol);
4807 }
4808 super.visitUnary(that);
4809 }
4811 @Override
4812 public void visitLambda(JCLambda that) {
4813 super.visitLambda(that);
4814 if (that.targets == null) {
4815 that.targets = List.nil();
4816 }
4817 }
4819 @Override
4820 public void visitReference(JCMemberReference that) {
4821 super.visitReference(that);
4822 if (that.sym == null) {
4823 that.sym = new MethodSymbol(0, names.empty, dummyMethodType(),
4824 syms.noSymbol);
4825 }
4826 if (that.targets == null) {
4827 that.targets = List.nil();
4828 }
4829 }
4830 }
4831 // </editor-fold>
4832 }
