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src/share/classes/com/sun/tools/javac/comp/Attr.java@9f11c7676cd5
src/share/classes/com/sun/tools/javac/comp/Attr.java
Fri, 31 May 2013 10:04:59 +0100
- author
- vromero
- date
- Fri, 31 May 2013 10:04:59 +0100
- changeset 1790
- 9f11c7676cd5
- parent 1780
- 6e5076af4660
- child 1802
- 8fb68f73d4b1
- permissions
- -rw-r--r--
7179353: try-with-resources fails to compile with generic exception parameters
Reviewed-by: mcimadamore
1 /*
2 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
30 import javax.lang.model.element.ElementKind;
31 import javax.lang.model.type.TypeKind;
32 import javax.tools.JavaFileObject;
34 import com.sun.source.tree.IdentifierTree;
35 import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
36 import com.sun.source.tree.MemberSelectTree;
37 import com.sun.source.tree.TreeVisitor;
38 import com.sun.source.util.SimpleTreeVisitor;
39 import com.sun.tools.javac.code.*;
40 import com.sun.tools.javac.code.Lint.LintCategory;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.code.Type.*;
43 import com.sun.tools.javac.comp.Check.CheckContext;
44 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
45 import com.sun.tools.javac.comp.Infer.InferenceContext;
46 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
47 import com.sun.tools.javac.jvm.*;
48 import com.sun.tools.javac.tree.*;
49 import com.sun.tools.javac.tree.JCTree.*;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
53 import com.sun.tools.javac.util.List;
54 import static com.sun.tools.javac.code.Flags.*;
55 import static com.sun.tools.javac.code.Flags.ANNOTATION;
56 import static com.sun.tools.javac.code.Flags.BLOCK;
57 import static com.sun.tools.javac.code.Kinds.*;
58 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
59 import static com.sun.tools.javac.code.TypeTag.*;
60 import static com.sun.tools.javac.code.TypeTag.WILDCARD;
61 import static com.sun.tools.javac.tree.JCTree.Tag.*;
63 /** This is the main context-dependent analysis phase in GJC. It
64 * encompasses name resolution, type checking and constant folding as
65 * subtasks. Some subtasks involve auxiliary classes.
66 * @see Check
67 * @see Resolve
68 * @see ConstFold
69 * @see Infer
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Attr extends JCTree.Visitor {
77 protected static final Context.Key<Attr> attrKey =
78 new Context.Key<Attr>();
80 final Names names;
81 final Log log;
82 final Symtab syms;
83 final Resolve rs;
84 final Infer infer;
85 final DeferredAttr deferredAttr;
86 final Check chk;
87 final Flow flow;
88 final MemberEnter memberEnter;
89 final TreeMaker make;
90 final ConstFold cfolder;
91 final Enter enter;
92 final Target target;
93 final Types types;
94 final JCDiagnostic.Factory diags;
95 final Annotate annotate;
96 final DeferredLintHandler deferredLintHandler;
98 public static Attr instance(Context context) {
99 Attr instance = context.get(attrKey);
100 if (instance == null)
101 instance = new Attr(context);
102 return instance;
103 }
105 protected Attr(Context context) {
106 context.put(attrKey, this);
108 names = Names.instance(context);
109 log = Log.instance(context);
110 syms = Symtab.instance(context);
111 rs = Resolve.instance(context);
112 chk = Check.instance(context);
113 flow = Flow.instance(context);
114 memberEnter = MemberEnter.instance(context);
115 make = TreeMaker.instance(context);
116 enter = Enter.instance(context);
117 infer = Infer.instance(context);
118 deferredAttr = DeferredAttr.instance(context);
119 cfolder = ConstFold.instance(context);
120 target = Target.instance(context);
121 types = Types.instance(context);
122 diags = JCDiagnostic.Factory.instance(context);
123 annotate = Annotate.instance(context);
124 deferredLintHandler = DeferredLintHandler.instance(context);
126 Options options = Options.instance(context);
128 Source source = Source.instance(context);
129 allowGenerics = source.allowGenerics();
130 allowVarargs = source.allowVarargs();
131 allowEnums = source.allowEnums();
132 allowBoxing = source.allowBoxing();
133 allowCovariantReturns = source.allowCovariantReturns();
134 allowAnonOuterThis = source.allowAnonOuterThis();
135 allowStringsInSwitch = source.allowStringsInSwitch();
136 allowPoly = source.allowPoly();
137 allowLambda = source.allowLambda();
138 allowDefaultMethods = source.allowDefaultMethods();
139 sourceName = source.name;
140 relax = (options.isSet("-retrofit") ||
141 options.isSet("-relax"));
142 findDiamonds = options.get("findDiamond") != null &&
143 source.allowDiamond();
144 useBeforeDeclarationWarning = options.isSet("useBeforeDeclarationWarning");
145 identifyLambdaCandidate = options.getBoolean("identifyLambdaCandidate", false);
147 statInfo = new ResultInfo(NIL, Type.noType);
148 varInfo = new ResultInfo(VAR, Type.noType);
149 unknownExprInfo = new ResultInfo(VAL, Type.noType);
150 unknownTypeInfo = new ResultInfo(TYP, Type.noType);
151 unknownTypeExprInfo = new ResultInfo(Kinds.TYP | Kinds.VAL, Type.noType);
152 recoveryInfo = new RecoveryInfo(deferredAttr.emptyDeferredAttrContext);
153 }
155 /** Switch: relax some constraints for retrofit mode.
156 */
157 boolean relax;
159 /** Switch: support target-typing inference
160 */
161 boolean allowPoly;
163 /** Switch: support generics?
164 */
165 boolean allowGenerics;
167 /** Switch: allow variable-arity methods.
168 */
169 boolean allowVarargs;
171 /** Switch: support enums?
172 */
173 boolean allowEnums;
175 /** Switch: support boxing and unboxing?
176 */
177 boolean allowBoxing;
179 /** Switch: support covariant result types?
180 */
181 boolean allowCovariantReturns;
183 /** Switch: support lambda expressions ?
184 */
185 boolean allowLambda;
187 /** Switch: support default methods ?
188 */
189 boolean allowDefaultMethods;
191 /** Switch: allow references to surrounding object from anonymous
192 * objects during constructor call?
193 */
194 boolean allowAnonOuterThis;
196 /** Switch: generates a warning if diamond can be safely applied
197 * to a given new expression
198 */
199 boolean findDiamonds;
201 /**
202 * Internally enables/disables diamond finder feature
203 */
204 static final boolean allowDiamondFinder = true;
206 /**
207 * Switch: warn about use of variable before declaration?
208 * RFE: 6425594
209 */
210 boolean useBeforeDeclarationWarning;
212 /**
213 * Switch: generate warnings whenever an anonymous inner class that is convertible
214 * to a lambda expression is found
215 */
216 boolean identifyLambdaCandidate;
218 /**
219 * Switch: allow strings in switch?
220 */
221 boolean allowStringsInSwitch;
223 /**
224 * Switch: name of source level; used for error reporting.
225 */
226 String sourceName;
228 /** Check kind and type of given tree against protokind and prototype.
229 * If check succeeds, store type in tree and return it.
230 * If check fails, store errType in tree and return it.
231 * No checks are performed if the prototype is a method type.
232 * It is not necessary in this case since we know that kind and type
233 * are correct.
234 *
235 * @param tree The tree whose kind and type is checked
236 * @param ownkind The computed kind of the tree
237 * @param resultInfo The expected result of the tree
238 */
239 Type check(final JCTree tree, final Type found, final int ownkind, final ResultInfo resultInfo) {
240 InferenceContext inferenceContext = resultInfo.checkContext.inferenceContext();
241 Type owntype = found;
242 if (!owntype.hasTag(ERROR) && !resultInfo.pt.hasTag(METHOD) && !resultInfo.pt.hasTag(FORALL)) {
243 if (inferenceContext.free(found)) {
244 inferenceContext.addFreeTypeListener(List.of(found, resultInfo.pt), new FreeTypeListener() {
245 @Override
246 public void typesInferred(InferenceContext inferenceContext) {
247 ResultInfo pendingResult =
248 resultInfo.dup(inferenceContext.asInstType(resultInfo.pt));
249 check(tree, inferenceContext.asInstType(found), ownkind, pendingResult);
250 }
251 });
252 return tree.type = resultInfo.pt;
253 } else {
254 if ((ownkind & ~resultInfo.pkind) == 0) {
255 owntype = resultInfo.check(tree, owntype);
256 } else {
257 log.error(tree.pos(), "unexpected.type",
258 kindNames(resultInfo.pkind),
259 kindName(ownkind));
260 owntype = types.createErrorType(owntype);
261 }
262 }
263 }
264 tree.type = owntype;
265 return owntype;
266 }
268 /** Is given blank final variable assignable, i.e. in a scope where it
269 * may be assigned to even though it is final?
270 * @param v The blank final variable.
271 * @param env The current environment.
272 */
273 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
274 Symbol owner = owner(env);
275 // owner refers to the innermost variable, method or
276 // initializer block declaration at this point.
277 return
278 v.owner == owner
279 ||
280 ((owner.name == names.init || // i.e. we are in a constructor
281 owner.kind == VAR || // i.e. we are in a variable initializer
282 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
283 &&
284 v.owner == owner.owner
285 &&
286 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
287 }
289 /**
290 * Return the innermost enclosing owner symbol in a given attribution context
291 */
292 Symbol owner(Env<AttrContext> env) {
293 while (true) {
294 switch (env.tree.getTag()) {
295 case VARDEF:
296 //a field can be owner
297 VarSymbol vsym = ((JCVariableDecl)env.tree).sym;
298 if (vsym.owner.kind == TYP) {
299 return vsym;
300 }
301 break;
302 case METHODDEF:
303 //method def is always an owner
304 return ((JCMethodDecl)env.tree).sym;
305 case CLASSDEF:
306 //class def is always an owner
307 return ((JCClassDecl)env.tree).sym;
308 case LAMBDA:
309 //a lambda is an owner - return a fresh synthetic method symbol
310 return new MethodSymbol(0, names.empty, null, syms.methodClass);
311 case BLOCK:
312 //static/instance init blocks are owner
313 Symbol blockSym = env.info.scope.owner;
314 if ((blockSym.flags() & BLOCK) != 0) {
315 return blockSym;
316 }
317 break;
318 case TOPLEVEL:
319 //toplevel is always an owner (for pkge decls)
320 return env.info.scope.owner;
321 }
322 Assert.checkNonNull(env.next);
323 env = env.next;
324 }
325 }
327 /** Check that variable can be assigned to.
328 * @param pos The current source code position.
329 * @param v The assigned varaible
330 * @param base If the variable is referred to in a Select, the part
331 * to the left of the `.', null otherwise.
332 * @param env The current environment.
333 */
334 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
335 if ((v.flags() & FINAL) != 0 &&
336 ((v.flags() & HASINIT) != 0
337 ||
338 !((base == null ||
339 (base.hasTag(IDENT) && TreeInfo.name(base) == names._this)) &&
340 isAssignableAsBlankFinal(v, env)))) {
341 if (v.isResourceVariable()) { //TWR resource
342 log.error(pos, "try.resource.may.not.be.assigned", v);
343 } else {
344 log.error(pos, "cant.assign.val.to.final.var", v);
345 }
346 }
347 }
349 /** Does tree represent a static reference to an identifier?
350 * It is assumed that tree is either a SELECT or an IDENT.
351 * We have to weed out selects from non-type names here.
352 * @param tree The candidate tree.
353 */
354 boolean isStaticReference(JCTree tree) {
355 if (tree.hasTag(SELECT)) {
356 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
357 if (lsym == null || lsym.kind != TYP) {
358 return false;
359 }
360 }
361 return true;
362 }
364 /** Is this symbol a type?
365 */
366 static boolean isType(Symbol sym) {
367 return sym != null && sym.kind == TYP;
368 }
370 /** The current `this' symbol.
371 * @param env The current environment.
372 */
373 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
374 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
375 }
377 /** Attribute a parsed identifier.
378 * @param tree Parsed identifier name
379 * @param topLevel The toplevel to use
380 */
381 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
382 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
383 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
384 syms.errSymbol.name,
385 null, null, null, null);
386 localEnv.enclClass.sym = syms.errSymbol;
387 return tree.accept(identAttributer, localEnv);
388 }
389 // where
390 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
391 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
392 @Override
393 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
394 Symbol site = visit(node.getExpression(), env);
395 if (site.kind == ERR)
396 return site;
397 Name name = (Name)node.getIdentifier();
398 if (site.kind == PCK) {
399 env.toplevel.packge = (PackageSymbol)site;
400 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
401 } else {
402 env.enclClass.sym = (ClassSymbol)site;
403 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
404 }
405 }
407 @Override
408 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
409 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
410 }
411 }
413 public Type coerce(Type etype, Type ttype) {
414 return cfolder.coerce(etype, ttype);
415 }
417 public Type attribType(JCTree node, TypeSymbol sym) {
418 Env<AttrContext> env = enter.typeEnvs.get(sym);
419 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
420 return attribTree(node, localEnv, unknownTypeInfo);
421 }
423 public Type attribImportQualifier(JCImport tree, Env<AttrContext> env) {
424 // Attribute qualifying package or class.
425 JCFieldAccess s = (JCFieldAccess)tree.qualid;
426 return attribTree(s.selected,
427 env,
428 new ResultInfo(tree.staticImport ? TYP : (TYP | PCK),
429 Type.noType));
430 }
432 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
433 breakTree = tree;
434 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
435 try {
436 attribExpr(expr, env);
437 } catch (BreakAttr b) {
438 return b.env;
439 } catch (AssertionError ae) {
440 if (ae.getCause() instanceof BreakAttr) {
441 return ((BreakAttr)(ae.getCause())).env;
442 } else {
443 throw ae;
444 }
445 } finally {
446 breakTree = null;
447 log.useSource(prev);
448 }
449 return env;
450 }
452 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
453 breakTree = tree;
454 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
455 try {
456 attribStat(stmt, env);
457 } catch (BreakAttr b) {
458 return b.env;
459 } catch (AssertionError ae) {
460 if (ae.getCause() instanceof BreakAttr) {
461 return ((BreakAttr)(ae.getCause())).env;
462 } else {
463 throw ae;
464 }
465 } finally {
466 breakTree = null;
467 log.useSource(prev);
468 }
469 return env;
470 }
472 private JCTree breakTree = null;
474 private static class BreakAttr extends RuntimeException {
475 static final long serialVersionUID = -6924771130405446405L;
476 private Env<AttrContext> env;
477 private BreakAttr(Env<AttrContext> env) {
478 this.env = copyEnv(env);
479 }
481 private Env<AttrContext> copyEnv(Env<AttrContext> env) {
482 Env<AttrContext> newEnv =
483 env.dup(env.tree, env.info.dup(copyScope(env.info.scope)));
484 if (newEnv.outer != null) {
485 newEnv.outer = copyEnv(newEnv.outer);
486 }
487 return newEnv;
488 }
490 private Scope copyScope(Scope sc) {
491 Scope newScope = new Scope(sc.owner);
492 List<Symbol> elemsList = List.nil();
493 while (sc != null) {
494 for (Scope.Entry e = sc.elems ; e != null ; e = e.sibling) {
495 elemsList = elemsList.prepend(e.sym);
496 }
497 sc = sc.next;
498 }
499 for (Symbol s : elemsList) {
500 newScope.enter(s);
501 }
502 return newScope;
503 }
504 }
506 class ResultInfo {
507 final int pkind;
508 final Type pt;
509 final CheckContext checkContext;
511 ResultInfo(int pkind, Type pt) {
512 this(pkind, pt, chk.basicHandler);
513 }
515 protected ResultInfo(int pkind, Type pt, CheckContext checkContext) {
516 this.pkind = pkind;
517 this.pt = pt;
518 this.checkContext = checkContext;
519 }
521 protected Type check(final DiagnosticPosition pos, final Type found) {
522 return chk.checkType(pos, found, pt, checkContext);
523 }
525 protected ResultInfo dup(Type newPt) {
526 return new ResultInfo(pkind, newPt, checkContext);
527 }
529 protected ResultInfo dup(CheckContext newContext) {
530 return new ResultInfo(pkind, pt, newContext);
531 }
532 }
534 class RecoveryInfo extends ResultInfo {
536 public RecoveryInfo(final DeferredAttr.DeferredAttrContext deferredAttrContext) {
537 super(Kinds.VAL, Type.recoveryType, new Check.NestedCheckContext(chk.basicHandler) {
538 @Override
539 public DeferredAttr.DeferredAttrContext deferredAttrContext() {
540 return deferredAttrContext;
541 }
542 @Override
543 public boolean compatible(Type found, Type req, Warner warn) {
544 return true;
545 }
546 @Override
547 public void report(DiagnosticPosition pos, JCDiagnostic details) {
548 chk.basicHandler.report(pos, details);
549 }
550 });
551 }
553 @Override
554 protected Type check(DiagnosticPosition pos, Type found) {
555 return chk.checkNonVoid(pos, super.check(pos, found));
556 }
557 }
559 final ResultInfo statInfo;
560 final ResultInfo varInfo;
561 final ResultInfo unknownExprInfo;
562 final ResultInfo unknownTypeInfo;
563 final ResultInfo unknownTypeExprInfo;
564 final ResultInfo recoveryInfo;
566 Type pt() {
567 return resultInfo.pt;
568 }
570 int pkind() {
571 return resultInfo.pkind;
572 }
574 /* ************************************************************************
575 * Visitor methods
576 *************************************************************************/
578 /** Visitor argument: the current environment.
579 */
580 Env<AttrContext> env;
582 /** Visitor argument: the currently expected attribution result.
583 */
584 ResultInfo resultInfo;
586 /** Visitor result: the computed type.
587 */
588 Type result;
590 /** Visitor method: attribute a tree, catching any completion failure
591 * exceptions. Return the tree's type.
592 *
593 * @param tree The tree to be visited.
594 * @param env The environment visitor argument.
595 * @param resultInfo The result info visitor argument.
596 */
597 Type attribTree(JCTree tree, Env<AttrContext> env, ResultInfo resultInfo) {
598 Env<AttrContext> prevEnv = this.env;
599 ResultInfo prevResult = this.resultInfo;
600 try {
601 this.env = env;
602 this.resultInfo = resultInfo;
603 tree.accept(this);
604 if (tree == breakTree &&
605 resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
606 throw new BreakAttr(env);
607 }
608 return result;
609 } catch (CompletionFailure ex) {
610 tree.type = syms.errType;
611 return chk.completionError(tree.pos(), ex);
612 } finally {
613 this.env = prevEnv;
614 this.resultInfo = prevResult;
615 }
616 }
618 /** Derived visitor method: attribute an expression tree.
619 */
620 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
621 return attribTree(tree, env, new ResultInfo(VAL, !pt.hasTag(ERROR) ? pt : Type.noType));
622 }
624 /** Derived visitor method: attribute an expression tree with
625 * no constraints on the computed type.
626 */
627 public Type attribExpr(JCTree tree, Env<AttrContext> env) {
628 return attribTree(tree, env, unknownExprInfo);
629 }
631 /** Derived visitor method: attribute a type tree.
632 */
633 public Type attribType(JCTree tree, Env<AttrContext> env) {
634 Type result = attribType(tree, env, Type.noType);
635 return result;
636 }
638 /** Derived visitor method: attribute a type tree.
639 */
640 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
641 Type result = attribTree(tree, env, new ResultInfo(TYP, pt));
642 return result;
643 }
645 /** Derived visitor method: attribute a statement or definition tree.
646 */
647 public Type attribStat(JCTree tree, Env<AttrContext> env) {
648 return attribTree(tree, env, statInfo);
649 }
651 /** Attribute a list of expressions, returning a list of types.
652 */
653 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
654 ListBuffer<Type> ts = new ListBuffer<Type>();
655 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
656 ts.append(attribExpr(l.head, env, pt));
657 return ts.toList();
658 }
660 /** Attribute a list of statements, returning nothing.
661 */
662 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
663 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
664 attribStat(l.head, env);
665 }
667 /** Attribute the arguments in a method call, returning a list of types.
668 */
669 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
670 ListBuffer<Type> argtypes = new ListBuffer<Type>();
671 for (JCExpression arg : trees) {
672 Type argtype = allowPoly && deferredAttr.isDeferred(env, arg) ?
673 deferredAttr.new DeferredType(arg, env) :
674 chk.checkNonVoid(arg, attribExpr(arg, env, Infer.anyPoly));
675 argtypes.append(argtype);
676 }
677 return argtypes.toList();
678 }
680 /** Attribute a type argument list, returning a list of types.
681 * Caller is responsible for calling checkRefTypes.
682 */
683 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
684 ListBuffer<Type> argtypes = new ListBuffer<Type>();
685 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
686 argtypes.append(attribType(l.head, env));
687 return argtypes.toList();
688 }
690 /** Attribute a type argument list, returning a list of types.
691 * Check that all the types are references.
692 */
693 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
694 List<Type> types = attribAnyTypes(trees, env);
695 return chk.checkRefTypes(trees, types);
696 }
698 /**
699 * Attribute type variables (of generic classes or methods).
700 * Compound types are attributed later in attribBounds.
701 * @param typarams the type variables to enter
702 * @param env the current environment
703 */
704 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
705 for (JCTypeParameter tvar : typarams) {
706 TypeVar a = (TypeVar)tvar.type;
707 a.tsym.flags_field |= UNATTRIBUTED;
708 a.bound = Type.noType;
709 if (!tvar.bounds.isEmpty()) {
710 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
711 for (JCExpression bound : tvar.bounds.tail)
712 bounds = bounds.prepend(attribType(bound, env));
713 types.setBounds(a, bounds.reverse());
714 } else {
715 // if no bounds are given, assume a single bound of
716 // java.lang.Object.
717 types.setBounds(a, List.of(syms.objectType));
718 }
719 a.tsym.flags_field &= ~UNATTRIBUTED;
720 }
721 for (JCTypeParameter tvar : typarams) {
722 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
723 }
724 }
726 /**
727 * Attribute the type references in a list of annotations.
728 */
729 void attribAnnotationTypes(List<JCAnnotation> annotations,
730 Env<AttrContext> env) {
731 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
732 JCAnnotation a = al.head;
733 attribType(a.annotationType, env);
734 }
735 }
737 /**
738 * Attribute a "lazy constant value".
739 * @param env The env for the const value
740 * @param initializer The initializer for the const value
741 * @param type The expected type, or null
742 * @see VarSymbol#setLazyConstValue
743 */
744 public Object attribLazyConstantValue(Env<AttrContext> env,
745 JCTree.JCExpression initializer,
746 Type type) {
748 // in case no lint value has been set up for this env, scan up
749 // env stack looking for smallest enclosing env for which it is set.
750 Env<AttrContext> lintEnv = env;
751 while (lintEnv.info.lint == null)
752 lintEnv = lintEnv.next;
754 // Having found the enclosing lint value, we can initialize the lint value for this class
755 // ... but ...
756 // There's a problem with evaluating annotations in the right order, such that
757 // env.info.enclVar.attributes_field might not yet have been evaluated, and so might be
758 // null. In that case, calling augment will throw an NPE. To avoid this, for now we
759 // revert to the jdk 6 behavior and ignore the (unevaluated) attributes.
760 if (env.info.enclVar.annotations.pendingCompletion()) {
761 env.info.lint = lintEnv.info.lint;
762 } else {
763 env.info.lint = lintEnv.info.lint.augment(env.info.enclVar.annotations,
764 env.info.enclVar.flags());
765 }
767 Lint prevLint = chk.setLint(env.info.lint);
768 JavaFileObject prevSource = log.useSource(env.toplevel.sourcefile);
770 try {
771 // Use null as symbol to not attach the type annotation to any symbol.
772 // The initializer will later also be visited and then we'll attach
773 // to the symbol.
774 // This prevents having multiple type annotations, just because of
775 // lazy constant value evaluation.
776 memberEnter.typeAnnotate(initializer, env, null);
777 annotate.flush();
778 Type itype = attribExpr(initializer, env, type);
779 if (itype.constValue() != null)
780 return coerce(itype, type).constValue();
781 else
782 return null;
783 } finally {
784 env.info.lint = prevLint;
785 log.useSource(prevSource);
786 }
787 }
789 /** Attribute type reference in an `extends' or `implements' clause.
790 * Supertypes of anonymous inner classes are usually already attributed.
791 *
792 * @param tree The tree making up the type reference.
793 * @param env The environment current at the reference.
794 * @param classExpected true if only a class is expected here.
795 * @param interfaceExpected true if only an interface is expected here.
796 */
797 Type attribBase(JCTree tree,
798 Env<AttrContext> env,
799 boolean classExpected,
800 boolean interfaceExpected,
801 boolean checkExtensible) {
802 Type t = tree.type != null ?
803 tree.type :
804 attribType(tree, env);
805 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
806 }
807 Type checkBase(Type t,
808 JCTree tree,
809 Env<AttrContext> env,
810 boolean classExpected,
811 boolean interfaceExpected,
812 boolean checkExtensible) {
813 if (t.isErroneous())
814 return t;
815 if (t.hasTag(TYPEVAR) && !classExpected && !interfaceExpected) {
816 // check that type variable is already visible
817 if (t.getUpperBound() == null) {
818 log.error(tree.pos(), "illegal.forward.ref");
819 return types.createErrorType(t);
820 }
821 } else {
822 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
823 }
824 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
825 log.error(tree.pos(), "intf.expected.here");
826 // return errType is necessary since otherwise there might
827 // be undetected cycles which cause attribution to loop
828 return types.createErrorType(t);
829 } else if (checkExtensible &&
830 classExpected &&
831 (t.tsym.flags() & INTERFACE) != 0) {
832 log.error(tree.pos(), "no.intf.expected.here");
833 return types.createErrorType(t);
834 }
835 if (checkExtensible &&
836 ((t.tsym.flags() & FINAL) != 0)) {
837 log.error(tree.pos(),
838 "cant.inherit.from.final", t.tsym);
839 }
840 chk.checkNonCyclic(tree.pos(), t);
841 return t;
842 }
844 Type attribIdentAsEnumType(Env<AttrContext> env, JCIdent id) {
845 Assert.check((env.enclClass.sym.flags() & ENUM) != 0);
846 id.type = env.info.scope.owner.type;
847 id.sym = env.info.scope.owner;
848 return id.type;
849 }
851 public void visitClassDef(JCClassDecl tree) {
852 // Local classes have not been entered yet, so we need to do it now:
853 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
854 enter.classEnter(tree, env);
856 ClassSymbol c = tree.sym;
857 if (c == null) {
858 // exit in case something drastic went wrong during enter.
859 result = null;
860 } else {
861 // make sure class has been completed:
862 c.complete();
864 // If this class appears as an anonymous class
865 // in a superclass constructor call where
866 // no explicit outer instance is given,
867 // disable implicit outer instance from being passed.
868 // (This would be an illegal access to "this before super").
869 if (env.info.isSelfCall &&
870 env.tree.hasTag(NEWCLASS) &&
871 ((JCNewClass) env.tree).encl == null)
872 {
873 c.flags_field |= NOOUTERTHIS;
874 }
875 attribClass(tree.pos(), c);
876 result = tree.type = c.type;
877 }
878 }
880 public void visitMethodDef(JCMethodDecl tree) {
881 MethodSymbol m = tree.sym;
882 boolean isDefaultMethod = (m.flags() & DEFAULT) != 0;
884 Lint lint = env.info.lint.augment(m.annotations, m.flags());
885 Lint prevLint = chk.setLint(lint);
886 MethodSymbol prevMethod = chk.setMethod(m);
887 try {
888 deferredLintHandler.flush(tree.pos());
889 chk.checkDeprecatedAnnotation(tree.pos(), m);
892 // Create a new environment with local scope
893 // for attributing the method.
894 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
895 localEnv.info.lint = lint;
897 attribStats(tree.typarams, localEnv);
899 // If we override any other methods, check that we do so properly.
900 // JLS ???
901 if (m.isStatic()) {
902 chk.checkHideClashes(tree.pos(), env.enclClass.type, m);
903 } else {
904 chk.checkOverrideClashes(tree.pos(), env.enclClass.type, m);
905 }
906 chk.checkOverride(tree, m);
908 if (isDefaultMethod && types.overridesObjectMethod(m.enclClass(), m)) {
909 log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
910 }
912 // Enter all type parameters into the local method scope.
913 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
914 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
916 ClassSymbol owner = env.enclClass.sym;
917 if ((owner.flags() & ANNOTATION) != 0 &&
918 tree.params.nonEmpty())
919 log.error(tree.params.head.pos(),
920 "intf.annotation.members.cant.have.params");
922 // Attribute all value parameters.
923 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
924 attribStat(l.head, localEnv);
925 }
927 chk.checkVarargsMethodDecl(localEnv, tree);
929 // Check that type parameters are well-formed.
930 chk.validate(tree.typarams, localEnv);
932 // Check that result type is well-formed.
933 chk.validate(tree.restype, localEnv);
935 // Check that receiver type is well-formed.
936 if (tree.recvparam != null) {
937 // Use a new environment to check the receiver parameter.
938 // Otherwise I get "might not have been initialized" errors.
939 // Is there a better way?
940 Env<AttrContext> newEnv = memberEnter.methodEnv(tree, env);
941 attribType(tree.recvparam, newEnv);
942 chk.validate(tree.recvparam, newEnv);
943 }
945 // annotation method checks
946 if ((owner.flags() & ANNOTATION) != 0) {
947 // annotation method cannot have throws clause
948 if (tree.thrown.nonEmpty()) {
949 log.error(tree.thrown.head.pos(),
950 "throws.not.allowed.in.intf.annotation");
951 }
952 // annotation method cannot declare type-parameters
953 if (tree.typarams.nonEmpty()) {
954 log.error(tree.typarams.head.pos(),
955 "intf.annotation.members.cant.have.type.params");
956 }
957 // validate annotation method's return type (could be an annotation type)
958 chk.validateAnnotationType(tree.restype);
959 // ensure that annotation method does not clash with members of Object/Annotation
960 chk.validateAnnotationMethod(tree.pos(), m);
962 if (tree.defaultValue != null) {
963 // if default value is an annotation, check it is a well-formed
964 // annotation value (e.g. no duplicate values, no missing values, etc.)
965 chk.validateAnnotationTree(tree.defaultValue);
966 }
967 }
969 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
970 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
972 if (tree.body == null) {
973 // Empty bodies are only allowed for
974 // abstract, native, or interface methods, or for methods
975 // in a retrofit signature class.
976 if (isDefaultMethod || (tree.sym.flags() & (ABSTRACT | NATIVE)) == 0 &&
977 !relax)
978 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
979 if (tree.defaultValue != null) {
980 if ((owner.flags() & ANNOTATION) == 0)
981 log.error(tree.pos(),
982 "default.allowed.in.intf.annotation.member");
983 }
984 } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
985 if ((owner.flags() & INTERFACE) != 0) {
986 log.error(tree.body.pos(), "intf.meth.cant.have.body");
987 } else {
988 log.error(tree.pos(), "abstract.meth.cant.have.body");
989 }
990 } else if ((tree.mods.flags & NATIVE) != 0) {
991 log.error(tree.pos(), "native.meth.cant.have.body");
992 } else {
993 // Add an implicit super() call unless an explicit call to
994 // super(...) or this(...) is given
995 // or we are compiling class java.lang.Object.
996 if (tree.name == names.init && owner.type != syms.objectType) {
997 JCBlock body = tree.body;
998 if (body.stats.isEmpty() ||
999 !TreeInfo.isSelfCall(body.stats.head)) {
1000 body.stats = body.stats.
1001 prepend(memberEnter.SuperCall(make.at(body.pos),
1002 List.<Type>nil(),
1003 List.<JCVariableDecl>nil(),
1004 false));
1005 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
1006 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
1007 TreeInfo.isSuperCall(body.stats.head)) {
1008 // enum constructors are not allowed to call super
1009 // directly, so make sure there aren't any super calls
1010 // in enum constructors, except in the compiler
1011 // generated one.
1012 log.error(tree.body.stats.head.pos(),
1013 "call.to.super.not.allowed.in.enum.ctor",
1014 env.enclClass.sym);
1015 }
1016 }
1018 // Attribute all type annotations in the body
1019 memberEnter.typeAnnotate(tree.body, localEnv, m);
1020 annotate.flush();
1022 // Attribute method body.
1023 attribStat(tree.body, localEnv);
1024 }
1026 localEnv.info.scope.leave();
1027 result = tree.type = m.type;
1028 chk.validateAnnotations(tree.mods.annotations, m);
1029 }
1030 finally {
1031 chk.setLint(prevLint);
1032 chk.setMethod(prevMethod);
1033 }
1034 }
1036 public void visitVarDef(JCVariableDecl tree) {
1037 // Local variables have not been entered yet, so we need to do it now:
1038 if (env.info.scope.owner.kind == MTH) {
1039 if (tree.sym != null) {
1040 // parameters have already been entered
1041 env.info.scope.enter(tree.sym);
1042 } else {
1043 memberEnter.memberEnter(tree, env);
1044 annotate.flush();
1045 }
1046 } else {
1047 if (tree.init != null) {
1048 // Field initializer expression need to be entered.
1049 memberEnter.typeAnnotate(tree.init, env, tree.sym);
1050 annotate.flush();
1051 }
1052 }
1054 VarSymbol v = tree.sym;
1055 Lint lint = env.info.lint.augment(v.annotations, v.flags());
1056 Lint prevLint = chk.setLint(lint);
1058 // Check that the variable's declared type is well-formed.
1059 boolean isImplicitLambdaParameter = env.tree.hasTag(LAMBDA) &&
1060 ((JCLambda)env.tree).paramKind == JCLambda.ParameterKind.IMPLICIT &&
1061 (tree.sym.flags() & PARAMETER) != 0;
1062 chk.validate(tree.vartype, env, !isImplicitLambdaParameter);
1063 deferredLintHandler.flush(tree.pos());
1065 try {
1066 chk.checkDeprecatedAnnotation(tree.pos(), v);
1068 if (tree.init != null) {
1069 if ((v.flags_field & FINAL) != 0 &&
1070 !tree.init.hasTag(NEWCLASS) &&
1071 !tree.init.hasTag(LAMBDA) &&
1072 !tree.init.hasTag(REFERENCE)) {
1073 // In this case, `v' is final. Ensure that it's initializer is
1074 // evaluated.
1075 v.getConstValue(); // ensure initializer is evaluated
1076 } else {
1077 // Attribute initializer in a new environment
1078 // with the declared variable as owner.
1079 // Check that initializer conforms to variable's declared type.
1080 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
1081 initEnv.info.lint = lint;
1082 // In order to catch self-references, we set the variable's
1083 // declaration position to maximal possible value, effectively
1084 // marking the variable as undefined.
1085 initEnv.info.enclVar = v;
1086 attribExpr(tree.init, initEnv, v.type);
1087 }
1088 }
1089 result = tree.type = v.type;
1090 chk.validateAnnotations(tree.mods.annotations, v);
1091 }
1092 finally {
1093 chk.setLint(prevLint);
1094 }
1095 }
1097 public void visitSkip(JCSkip tree) {
1098 result = null;
1099 }
1101 public void visitBlock(JCBlock tree) {
1102 if (env.info.scope.owner.kind == TYP) {
1103 // Block is a static or instance initializer;
1104 // let the owner of the environment be a freshly
1105 // created BLOCK-method.
1106 Env<AttrContext> localEnv =
1107 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
1108 localEnv.info.scope.owner =
1109 new MethodSymbol(tree.flags | BLOCK |
1110 env.info.scope.owner.flags() & STRICTFP, names.empty, null,
1111 env.info.scope.owner);
1112 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
1114 // Attribute all type annotations in the block
1115 memberEnter.typeAnnotate(tree, localEnv, localEnv.info.scope.owner);
1116 annotate.flush();
1118 {
1119 // Store init and clinit type annotations with the ClassSymbol
1120 // to allow output in Gen.normalizeDefs.
1121 ClassSymbol cs = (ClassSymbol)env.info.scope.owner;
1122 List<Attribute.TypeCompound> tas = localEnv.info.scope.owner.getRawTypeAttributes();
1123 if ((tree.flags & STATIC) != 0) {
1124 cs.annotations.appendClassInitTypeAttributes(tas);
1125 } else {
1126 cs.annotations.appendInitTypeAttributes(tas);
1127 }
1128 }
1130 attribStats(tree.stats, localEnv);
1131 } else {
1132 // Create a new local environment with a local scope.
1133 Env<AttrContext> localEnv =
1134 env.dup(tree, env.info.dup(env.info.scope.dup()));
1135 try {
1136 attribStats(tree.stats, localEnv);
1137 } finally {
1138 localEnv.info.scope.leave();
1139 }
1140 }
1141 result = null;
1142 }
1144 public void visitDoLoop(JCDoWhileLoop tree) {
1145 attribStat(tree.body, env.dup(tree));
1146 attribExpr(tree.cond, env, syms.booleanType);
1147 result = null;
1148 }
1150 public void visitWhileLoop(JCWhileLoop tree) {
1151 attribExpr(tree.cond, env, syms.booleanType);
1152 attribStat(tree.body, env.dup(tree));
1153 result = null;
1154 }
1156 public void visitForLoop(JCForLoop tree) {
1157 Env<AttrContext> loopEnv =
1158 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1159 try {
1160 attribStats(tree.init, loopEnv);
1161 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
1162 loopEnv.tree = tree; // before, we were not in loop!
1163 attribStats(tree.step, loopEnv);
1164 attribStat(tree.body, loopEnv);
1165 result = null;
1166 }
1167 finally {
1168 loopEnv.info.scope.leave();
1169 }
1170 }
1172 public void visitForeachLoop(JCEnhancedForLoop tree) {
1173 Env<AttrContext> loopEnv =
1174 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
1175 try {
1176 attribStat(tree.var, loopEnv);
1177 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
1178 chk.checkNonVoid(tree.pos(), exprType);
1179 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
1180 if (elemtype == null) {
1181 // or perhaps expr implements Iterable<T>?
1182 Type base = types.asSuper(exprType, syms.iterableType.tsym);
1183 if (base == null) {
1184 log.error(tree.expr.pos(),
1185 "foreach.not.applicable.to.type",
1186 exprType,
1187 diags.fragment("type.req.array.or.iterable"));
1188 elemtype = types.createErrorType(exprType);
1189 } else {
1190 List<Type> iterableParams = base.allparams();
1191 elemtype = iterableParams.isEmpty()
1192 ? syms.objectType
1193 : types.upperBound(iterableParams.head);
1194 }
1195 }
1196 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
1197 loopEnv.tree = tree; // before, we were not in loop!
1198 attribStat(tree.body, loopEnv);
1199 result = null;
1200 }
1201 finally {
1202 loopEnv.info.scope.leave();
1203 }
1204 }
1206 public void visitLabelled(JCLabeledStatement tree) {
1207 // Check that label is not used in an enclosing statement
1208 Env<AttrContext> env1 = env;
1209 while (env1 != null && !env1.tree.hasTag(CLASSDEF)) {
1210 if (env1.tree.hasTag(LABELLED) &&
1211 ((JCLabeledStatement) env1.tree).label == tree.label) {
1212 log.error(tree.pos(), "label.already.in.use",
1213 tree.label);
1214 break;
1215 }
1216 env1 = env1.next;
1217 }
1219 attribStat(tree.body, env.dup(tree));
1220 result = null;
1221 }
1223 public void visitSwitch(JCSwitch tree) {
1224 Type seltype = attribExpr(tree.selector, env);
1226 Env<AttrContext> switchEnv =
1227 env.dup(tree, env.info.dup(env.info.scope.dup()));
1229 try {
1231 boolean enumSwitch =
1232 allowEnums &&
1233 (seltype.tsym.flags() & Flags.ENUM) != 0;
1234 boolean stringSwitch = false;
1235 if (types.isSameType(seltype, syms.stringType)) {
1236 if (allowStringsInSwitch) {
1237 stringSwitch = true;
1238 } else {
1239 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
1240 }
1241 }
1242 if (!enumSwitch && !stringSwitch)
1243 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
1245 // Attribute all cases and
1246 // check that there are no duplicate case labels or default clauses.
1247 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
1248 boolean hasDefault = false; // Is there a default label?
1249 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
1250 JCCase c = l.head;
1251 Env<AttrContext> caseEnv =
1252 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
1253 try {
1254 if (c.pat != null) {
1255 if (enumSwitch) {
1256 Symbol sym = enumConstant(c.pat, seltype);
1257 if (sym == null) {
1258 log.error(c.pat.pos(), "enum.label.must.be.unqualified.enum");
1259 } else if (!labels.add(sym)) {
1260 log.error(c.pos(), "duplicate.case.label");
1261 }
1262 } else {
1263 Type pattype = attribExpr(c.pat, switchEnv, seltype);
1264 if (!pattype.hasTag(ERROR)) {
1265 if (pattype.constValue() == null) {
1266 log.error(c.pat.pos(),
1267 (stringSwitch ? "string.const.req" : "const.expr.req"));
1268 } else if (labels.contains(pattype.constValue())) {
1269 log.error(c.pos(), "duplicate.case.label");
1270 } else {
1271 labels.add(pattype.constValue());
1272 }
1273 }
1274 }
1275 } else if (hasDefault) {
1276 log.error(c.pos(), "duplicate.default.label");
1277 } else {
1278 hasDefault = true;
1279 }
1280 attribStats(c.stats, caseEnv);
1281 } finally {
1282 caseEnv.info.scope.leave();
1283 addVars(c.stats, switchEnv.info.scope);
1284 }
1285 }
1287 result = null;
1288 }
1289 finally {
1290 switchEnv.info.scope.leave();
1291 }
1292 }
1293 // where
1294 /** Add any variables defined in stats to the switch scope. */
1295 private static void addVars(List<JCStatement> stats, Scope switchScope) {
1296 for (;stats.nonEmpty(); stats = stats.tail) {
1297 JCTree stat = stats.head;
1298 if (stat.hasTag(VARDEF))
1299 switchScope.enter(((JCVariableDecl) stat).sym);
1300 }
1301 }
1302 // where
1303 /** Return the selected enumeration constant symbol, or null. */
1304 private Symbol enumConstant(JCTree tree, Type enumType) {
1305 if (!tree.hasTag(IDENT)) {
1306 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
1307 return syms.errSymbol;
1308 }
1309 JCIdent ident = (JCIdent)tree;
1310 Name name = ident.name;
1311 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1312 e.scope != null; e = e.next()) {
1313 if (e.sym.kind == VAR) {
1314 Symbol s = ident.sym = e.sym;
1315 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1316 ident.type = s.type;
1317 return ((s.flags_field & Flags.ENUM) == 0)
1318 ? null : s;
1319 }
1320 }
1321 return null;
1322 }
1324 public void visitSynchronized(JCSynchronized tree) {
1325 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1326 attribStat(tree.body, env);
1327 result = null;
1328 }
1330 public void visitTry(JCTry tree) {
1331 // Create a new local environment with a local
1332 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1333 try {
1334 boolean isTryWithResource = tree.resources.nonEmpty();
1335 // Create a nested environment for attributing the try block if needed
1336 Env<AttrContext> tryEnv = isTryWithResource ?
1337 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1338 localEnv;
1339 try {
1340 // Attribute resource declarations
1341 for (JCTree resource : tree.resources) {
1342 CheckContext twrContext = new Check.NestedCheckContext(resultInfo.checkContext) {
1343 @Override
1344 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1345 chk.basicHandler.report(pos, diags.fragment("try.not.applicable.to.type", details));
1346 }
1347 };
1348 ResultInfo twrResult = new ResultInfo(VAL, syms.autoCloseableType, twrContext);
1349 if (resource.hasTag(VARDEF)) {
1350 attribStat(resource, tryEnv);
1351 twrResult.check(resource, resource.type);
1353 //check that resource type cannot throw InterruptedException
1354 checkAutoCloseable(resource.pos(), localEnv, resource.type);
1356 VarSymbol var = ((JCVariableDecl) resource).sym;
1357 var.setData(ElementKind.RESOURCE_VARIABLE);
1358 } else {
1359 attribTree(resource, tryEnv, twrResult);
1360 }
1361 }
1362 // Attribute body
1363 attribStat(tree.body, tryEnv);
1364 } finally {
1365 if (isTryWithResource)
1366 tryEnv.info.scope.leave();
1367 }
1369 // Attribute catch clauses
1370 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1371 JCCatch c = l.head;
1372 Env<AttrContext> catchEnv =
1373 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1374 try {
1375 Type ctype = attribStat(c.param, catchEnv);
1376 if (TreeInfo.isMultiCatch(c)) {
1377 //multi-catch parameter is implicitly marked as final
1378 c.param.sym.flags_field |= FINAL | UNION;
1379 }
1380 if (c.param.sym.kind == Kinds.VAR) {
1381 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1382 }
1383 chk.checkType(c.param.vartype.pos(),
1384 chk.checkClassType(c.param.vartype.pos(), ctype),
1385 syms.throwableType);
1386 attribStat(c.body, catchEnv);
1387 } finally {
1388 catchEnv.info.scope.leave();
1389 }
1390 }
1392 // Attribute finalizer
1393 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1394 result = null;
1395 }
1396 finally {
1397 localEnv.info.scope.leave();
1398 }
1399 }
1401 void checkAutoCloseable(DiagnosticPosition pos, Env<AttrContext> env, Type resource) {
1402 if (!resource.isErroneous() &&
1403 types.asSuper(resource, syms.autoCloseableType.tsym) != null &&
1404 !types.isSameType(resource, syms.autoCloseableType)) { // Don't emit warning for AutoCloseable itself
1405 Symbol close = syms.noSymbol;
1406 Log.DiagnosticHandler discardHandler = new Log.DiscardDiagnosticHandler(log);
1407 try {
1408 close = rs.resolveQualifiedMethod(pos,
1409 env,
1410 resource,
1411 names.close,
1412 List.<Type>nil(),
1413 List.<Type>nil());
1414 }
1415 finally {
1416 log.popDiagnosticHandler(discardHandler);
1417 }
1418 if (close.kind == MTH &&
1419 close.overrides(syms.autoCloseableClose, resource.tsym, types, true) &&
1420 chk.isHandled(syms.interruptedExceptionType, types.memberType(resource, close).getThrownTypes()) &&
1421 env.info.lint.isEnabled(LintCategory.TRY)) {
1422 log.warning(LintCategory.TRY, pos, "try.resource.throws.interrupted.exc", resource);
1423 }
1424 }
1425 }
1427 public void visitConditional(JCConditional tree) {
1428 Type condtype = attribExpr(tree.cond, env, syms.booleanType);
1430 tree.polyKind = (!allowPoly ||
1431 pt().hasTag(NONE) && pt() != Type.recoveryType ||
1432 isBooleanOrNumeric(env, tree)) ?
1433 PolyKind.STANDALONE : PolyKind.POLY;
1435 if (tree.polyKind == PolyKind.POLY && resultInfo.pt.hasTag(VOID)) {
1436 //cannot get here (i.e. it means we are returning from void method - which is already an error)
1437 resultInfo.checkContext.report(tree, diags.fragment("conditional.target.cant.be.void"));
1438 result = tree.type = types.createErrorType(resultInfo.pt);
1439 return;
1440 }
1442 ResultInfo condInfo = tree.polyKind == PolyKind.STANDALONE ?
1443 unknownExprInfo :
1444 resultInfo.dup(new Check.NestedCheckContext(resultInfo.checkContext) {
1445 //this will use enclosing check context to check compatibility of
1446 //subexpression against target type; if we are in a method check context,
1447 //depending on whether boxing is allowed, we could have incompatibilities
1448 @Override
1449 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1450 enclosingContext.report(pos, diags.fragment("incompatible.type.in.conditional", details));
1451 }
1452 });
1454 Type truetype = attribTree(tree.truepart, env, condInfo);
1455 Type falsetype = attribTree(tree.falsepart, env, condInfo);
1457 Type owntype = (tree.polyKind == PolyKind.STANDALONE) ? condType(tree, truetype, falsetype) : pt();
1458 if (condtype.constValue() != null &&
1459 truetype.constValue() != null &&
1460 falsetype.constValue() != null &&
1461 !owntype.hasTag(NONE)) {
1462 //constant folding
1463 owntype = cfolder.coerce(condtype.isTrue() ? truetype : falsetype, owntype);
1464 }
1465 result = check(tree, owntype, VAL, resultInfo);
1466 }
1467 //where
1468 private boolean isBooleanOrNumeric(Env<AttrContext> env, JCExpression tree) {
1469 switch (tree.getTag()) {
1470 case LITERAL: return ((JCLiteral)tree).typetag.isSubRangeOf(DOUBLE) ||
1471 ((JCLiteral)tree).typetag == BOOLEAN ||
1472 ((JCLiteral)tree).typetag == BOT;
1473 case LAMBDA: case REFERENCE: return false;
1474 case PARENS: return isBooleanOrNumeric(env, ((JCParens)tree).expr);
1475 case CONDEXPR:
1476 JCConditional condTree = (JCConditional)tree;
1477 return isBooleanOrNumeric(env, condTree.truepart) &&
1478 isBooleanOrNumeric(env, condTree.falsepart);
1479 case APPLY:
1480 JCMethodInvocation speculativeMethodTree =
1481 (JCMethodInvocation)deferredAttr.attribSpeculative(tree, env, unknownExprInfo);
1482 Type owntype = TreeInfo.symbol(speculativeMethodTree.meth).type.getReturnType();
1483 return types.unboxedTypeOrType(owntype).isPrimitive();
1484 case NEWCLASS:
1485 JCExpression className =
1486 removeClassParams.translate(((JCNewClass)tree).clazz);
1487 JCExpression speculativeNewClassTree =
1488 (JCExpression)deferredAttr.attribSpeculative(className, env, unknownTypeInfo);
1489 return types.unboxedTypeOrType(speculativeNewClassTree.type).isPrimitive();
1490 default:
1491 Type speculativeType = deferredAttr.attribSpeculative(tree, env, unknownExprInfo).type;
1492 speculativeType = types.unboxedTypeOrType(speculativeType);
1493 return speculativeType.isPrimitive();
1494 }
1495 }
1496 //where
1497 TreeTranslator removeClassParams = new TreeTranslator() {
1498 @Override
1499 public void visitTypeApply(JCTypeApply tree) {
1500 result = translate(tree.clazz);
1501 }
1502 };
1504 /** Compute the type of a conditional expression, after
1505 * checking that it exists. See JLS 15.25. Does not take into
1506 * account the special case where condition and both arms
1507 * are constants.
1508 *
1509 * @param pos The source position to be used for error
1510 * diagnostics.
1511 * @param thentype The type of the expression's then-part.
1512 * @param elsetype The type of the expression's else-part.
1513 */
1514 private Type condType(DiagnosticPosition pos,
1515 Type thentype, Type elsetype) {
1516 // If same type, that is the result
1517 if (types.isSameType(thentype, elsetype))
1518 return thentype.baseType();
1520 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1521 ? thentype : types.unboxedType(thentype);
1522 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1523 ? elsetype : types.unboxedType(elsetype);
1525 // Otherwise, if both arms can be converted to a numeric
1526 // type, return the least numeric type that fits both arms
1527 // (i.e. return larger of the two, or return int if one
1528 // arm is short, the other is char).
1529 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1530 // If one arm has an integer subrange type (i.e., byte,
1531 // short, or char), and the other is an integer constant
1532 // that fits into the subrange, return the subrange type.
1533 if (thenUnboxed.getTag().isStrictSubRangeOf(INT) && elseUnboxed.hasTag(INT) &&
1534 types.isAssignable(elseUnboxed, thenUnboxed))
1535 return thenUnboxed.baseType();
1536 if (elseUnboxed.getTag().isStrictSubRangeOf(INT) && thenUnboxed.hasTag(INT) &&
1537 types.isAssignable(thenUnboxed, elseUnboxed))
1538 return elseUnboxed.baseType();
1540 for (TypeTag tag : TypeTag.values()) {
1541 if (tag.ordinal() >= TypeTag.getTypeTagCount()) break;
1542 Type candidate = syms.typeOfTag[tag.ordinal()];
1543 if (candidate != null &&
1544 candidate.isPrimitive() &&
1545 types.isSubtype(thenUnboxed, candidate) &&
1546 types.isSubtype(elseUnboxed, candidate))
1547 return candidate;
1548 }
1549 }
1551 // Those were all the cases that could result in a primitive
1552 if (allowBoxing) {
1553 if (thentype.isPrimitive())
1554 thentype = types.boxedClass(thentype).type;
1555 if (elsetype.isPrimitive())
1556 elsetype = types.boxedClass(elsetype).type;
1557 }
1559 if (types.isSubtype(thentype, elsetype))
1560 return elsetype.baseType();
1561 if (types.isSubtype(elsetype, thentype))
1562 return thentype.baseType();
1564 if (!allowBoxing || thentype.hasTag(VOID) || elsetype.hasTag(VOID)) {
1565 log.error(pos, "neither.conditional.subtype",
1566 thentype, elsetype);
1567 return thentype.baseType();
1568 }
1570 // both are known to be reference types. The result is
1571 // lub(thentype,elsetype). This cannot fail, as it will
1572 // always be possible to infer "Object" if nothing better.
1573 return types.lub(thentype.baseType(), elsetype.baseType());
1574 }
1576 public void visitIf(JCIf tree) {
1577 attribExpr(tree.cond, env, syms.booleanType);
1578 attribStat(tree.thenpart, env);
1579 if (tree.elsepart != null)
1580 attribStat(tree.elsepart, env);
1581 chk.checkEmptyIf(tree);
1582 result = null;
1583 }
1585 public void visitExec(JCExpressionStatement tree) {
1586 //a fresh environment is required for 292 inference to work properly ---
1587 //see Infer.instantiatePolymorphicSignatureInstance()
1588 Env<AttrContext> localEnv = env.dup(tree);
1589 attribExpr(tree.expr, localEnv);
1590 result = null;
1591 }
1593 public void visitBreak(JCBreak tree) {
1594 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1595 result = null;
1596 }
1598 public void visitContinue(JCContinue tree) {
1599 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1600 result = null;
1601 }
1602 //where
1603 /** Return the target of a break or continue statement, if it exists,
1604 * report an error if not.
1605 * Note: The target of a labelled break or continue is the
1606 * (non-labelled) statement tree referred to by the label,
1607 * not the tree representing the labelled statement itself.
1608 *
1609 * @param pos The position to be used for error diagnostics
1610 * @param tag The tag of the jump statement. This is either
1611 * Tree.BREAK or Tree.CONTINUE.
1612 * @param label The label of the jump statement, or null if no
1613 * label is given.
1614 * @param env The environment current at the jump statement.
1615 */
1616 private JCTree findJumpTarget(DiagnosticPosition pos,
1617 JCTree.Tag tag,
1618 Name label,
1619 Env<AttrContext> env) {
1620 // Search environments outwards from the point of jump.
1621 Env<AttrContext> env1 = env;
1622 LOOP:
1623 while (env1 != null) {
1624 switch (env1.tree.getTag()) {
1625 case LABELLED:
1626 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1627 if (label == labelled.label) {
1628 // If jump is a continue, check that target is a loop.
1629 if (tag == CONTINUE) {
1630 if (!labelled.body.hasTag(DOLOOP) &&
1631 !labelled.body.hasTag(WHILELOOP) &&
1632 !labelled.body.hasTag(FORLOOP) &&
1633 !labelled.body.hasTag(FOREACHLOOP))
1634 log.error(pos, "not.loop.label", label);
1635 // Found labelled statement target, now go inwards
1636 // to next non-labelled tree.
1637 return TreeInfo.referencedStatement(labelled);
1638 } else {
1639 return labelled;
1640 }
1641 }
1642 break;
1643 case DOLOOP:
1644 case WHILELOOP:
1645 case FORLOOP:
1646 case FOREACHLOOP:
1647 if (label == null) return env1.tree;
1648 break;
1649 case SWITCH:
1650 if (label == null && tag == BREAK) return env1.tree;
1651 break;
1652 case LAMBDA:
1653 case METHODDEF:
1654 case CLASSDEF:
1655 break LOOP;
1656 default:
1657 }
1658 env1 = env1.next;
1659 }
1660 if (label != null)
1661 log.error(pos, "undef.label", label);
1662 else if (tag == CONTINUE)
1663 log.error(pos, "cont.outside.loop");
1664 else
1665 log.error(pos, "break.outside.switch.loop");
1666 return null;
1667 }
1669 public void visitReturn(JCReturn tree) {
1670 // Check that there is an enclosing method which is
1671 // nested within than the enclosing class.
1672 if (env.info.returnResult == null) {
1673 log.error(tree.pos(), "ret.outside.meth");
1674 } else {
1675 // Attribute return expression, if it exists, and check that
1676 // it conforms to result type of enclosing method.
1677 if (tree.expr != null) {
1678 if (env.info.returnResult.pt.hasTag(VOID)) {
1679 env.info.returnResult.checkContext.report(tree.expr.pos(),
1680 diags.fragment("unexpected.ret.val"));
1681 }
1682 attribTree(tree.expr, env, env.info.returnResult);
1683 } else if (!env.info.returnResult.pt.hasTag(VOID)) {
1684 env.info.returnResult.checkContext.report(tree.pos(),
1685 diags.fragment("missing.ret.val"));
1686 }
1687 }
1688 result = null;
1689 }
1691 public void visitThrow(JCThrow tree) {
1692 Type owntype = attribExpr(tree.expr, env, allowPoly ? Type.noType : syms.throwableType);
1693 if (allowPoly) {
1694 chk.checkType(tree, owntype, syms.throwableType);
1695 }
1696 result = null;
1697 }
1699 public void visitAssert(JCAssert tree) {
1700 attribExpr(tree.cond, env, syms.booleanType);
1701 if (tree.detail != null) {
1702 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1703 }
1704 result = null;
1705 }
1707 /** Visitor method for method invocations.
1708 * NOTE: The method part of an application will have in its type field
1709 * the return type of the method, not the method's type itself!
1710 */
1711 public void visitApply(JCMethodInvocation tree) {
1712 // The local environment of a method application is
1713 // a new environment nested in the current one.
1714 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1716 // The types of the actual method arguments.
1717 List<Type> argtypes;
1719 // The types of the actual method type arguments.
1720 List<Type> typeargtypes = null;
1722 Name methName = TreeInfo.name(tree.meth);
1724 boolean isConstructorCall =
1725 methName == names._this || methName == names._super;
1727 if (isConstructorCall) {
1728 // We are seeing a ...this(...) or ...super(...) call.
1729 // Check that this is the first statement in a constructor.
1730 if (checkFirstConstructorStat(tree, env)) {
1732 // Record the fact
1733 // that this is a constructor call (using isSelfCall).
1734 localEnv.info.isSelfCall = true;
1736 // Attribute arguments, yielding list of argument types.
1737 argtypes = attribArgs(tree.args, localEnv);
1738 typeargtypes = attribTypes(tree.typeargs, localEnv);
1740 // Variable `site' points to the class in which the called
1741 // constructor is defined.
1742 Type site = env.enclClass.sym.type;
1743 if (methName == names._super) {
1744 if (site == syms.objectType) {
1745 log.error(tree.meth.pos(), "no.superclass", site);
1746 site = types.createErrorType(syms.objectType);
1747 } else {
1748 site = types.supertype(site);
1749 }
1750 }
1752 if (site.hasTag(CLASS)) {
1753 Type encl = site.getEnclosingType();
1754 while (encl != null && encl.hasTag(TYPEVAR))
1755 encl = encl.getUpperBound();
1756 if (encl.hasTag(CLASS)) {
1757 // we are calling a nested class
1759 if (tree.meth.hasTag(SELECT)) {
1760 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1762 // We are seeing a prefixed call, of the form
1763 // <expr>.super(...).
1764 // Check that the prefix expression conforms
1765 // to the outer instance type of the class.
1766 chk.checkRefType(qualifier.pos(),
1767 attribExpr(qualifier, localEnv,
1768 encl));
1769 } else if (methName == names._super) {
1770 // qualifier omitted; check for existence
1771 // of an appropriate implicit qualifier.
1772 rs.resolveImplicitThis(tree.meth.pos(),
1773 localEnv, site, true);
1774 }
1775 } else if (tree.meth.hasTag(SELECT)) {
1776 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1777 site.tsym);
1778 }
1780 // if we're calling a java.lang.Enum constructor,
1781 // prefix the implicit String and int parameters
1782 if (site.tsym == syms.enumSym && allowEnums)
1783 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1785 // Resolve the called constructor under the assumption
1786 // that we are referring to a superclass instance of the
1787 // current instance (JLS ???).
1788 boolean selectSuperPrev = localEnv.info.selectSuper;
1789 localEnv.info.selectSuper = true;
1790 localEnv.info.pendingResolutionPhase = null;
1791 Symbol sym = rs.resolveConstructor(
1792 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1793 localEnv.info.selectSuper = selectSuperPrev;
1795 // Set method symbol to resolved constructor...
1796 TreeInfo.setSymbol(tree.meth, sym);
1798 // ...and check that it is legal in the current context.
1799 // (this will also set the tree's type)
1800 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1801 checkId(tree.meth, site, sym, localEnv, new ResultInfo(MTH, mpt));
1802 }
1803 // Otherwise, `site' is an error type and we do nothing
1804 }
1805 result = tree.type = syms.voidType;
1806 } else {
1807 // Otherwise, we are seeing a regular method call.
1808 // Attribute the arguments, yielding list of argument types, ...
1809 argtypes = attribArgs(tree.args, localEnv);
1810 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1812 // ... and attribute the method using as a prototype a methodtype
1813 // whose formal argument types is exactly the list of actual
1814 // arguments (this will also set the method symbol).
1815 Type mpt = newMethodTemplate(resultInfo.pt, argtypes, typeargtypes);
1816 localEnv.info.pendingResolutionPhase = null;
1817 Type mtype = attribTree(tree.meth, localEnv, new ResultInfo(VAL, mpt, resultInfo.checkContext));
1819 // Compute the result type.
1820 Type restype = mtype.getReturnType();
1821 if (restype.hasTag(WILDCARD))
1822 throw new AssertionError(mtype);
1824 Type qualifier = (tree.meth.hasTag(SELECT))
1825 ? ((JCFieldAccess) tree.meth).selected.type
1826 : env.enclClass.sym.type;
1827 restype = adjustMethodReturnType(qualifier, methName, argtypes, restype);
1829 chk.checkRefTypes(tree.typeargs, typeargtypes);
1831 // Check that value of resulting type is admissible in the
1832 // current context. Also, capture the return type
1833 result = check(tree, capture(restype), VAL, resultInfo);
1835 if (localEnv.info.lastResolveVarargs())
1836 Assert.check(result.isErroneous() || tree.varargsElement != null);
1837 }
1838 chk.validate(tree.typeargs, localEnv);
1839 }
1840 //where
1841 Type adjustMethodReturnType(Type qualifierType, Name methodName, List<Type> argtypes, Type restype) {
1842 if (allowCovariantReturns &&
1843 methodName == names.clone &&
1844 types.isArray(qualifierType)) {
1845 // as a special case, array.clone() has a result that is
1846 // the same as static type of the array being cloned
1847 return qualifierType;
1848 } else if (allowGenerics &&
1849 methodName == names.getClass &&
1850 argtypes.isEmpty()) {
1851 // as a special case, x.getClass() has type Class<? extends |X|>
1852 return new ClassType(restype.getEnclosingType(),
1853 List.<Type>of(new WildcardType(types.erasure(qualifierType),
1854 BoundKind.EXTENDS,
1855 syms.boundClass)),
1856 restype.tsym);
1857 } else {
1858 return restype;
1859 }
1860 }
1862 /** Check that given application node appears as first statement
1863 * in a constructor call.
1864 * @param tree The application node
1865 * @param env The environment current at the application.
1866 */
1867 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1868 JCMethodDecl enclMethod = env.enclMethod;
1869 if (enclMethod != null && enclMethod.name == names.init) {
1870 JCBlock body = enclMethod.body;
1871 if (body.stats.head.hasTag(EXEC) &&
1872 ((JCExpressionStatement) body.stats.head).expr == tree)
1873 return true;
1874 }
1875 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1876 TreeInfo.name(tree.meth));
1877 return false;
1878 }
1880 /** Obtain a method type with given argument types.
1881 */
1882 Type newMethodTemplate(Type restype, List<Type> argtypes, List<Type> typeargtypes) {
1883 MethodType mt = new MethodType(argtypes, restype, List.<Type>nil(), syms.methodClass);
1884 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1885 }
1887 public void visitNewClass(final JCNewClass tree) {
1888 Type owntype = types.createErrorType(tree.type);
1890 // The local environment of a class creation is
1891 // a new environment nested in the current one.
1892 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1894 // The anonymous inner class definition of the new expression,
1895 // if one is defined by it.
1896 JCClassDecl cdef = tree.def;
1898 // If enclosing class is given, attribute it, and
1899 // complete class name to be fully qualified
1900 JCExpression clazz = tree.clazz; // Class field following new
1901 JCExpression clazzid; // Identifier in class field
1902 JCAnnotatedType annoclazzid; // Annotated type enclosing clazzid
1903 annoclazzid = null;
1905 if (clazz.hasTag(TYPEAPPLY)) {
1906 clazzid = ((JCTypeApply) clazz).clazz;
1907 if (clazzid.hasTag(ANNOTATED_TYPE)) {
1908 annoclazzid = (JCAnnotatedType) clazzid;
1909 clazzid = annoclazzid.underlyingType;
1910 }
1911 } else {
1912 if (clazz.hasTag(ANNOTATED_TYPE)) {
1913 annoclazzid = (JCAnnotatedType) clazz;
1914 clazzid = annoclazzid.underlyingType;
1915 } else {
1916 clazzid = clazz;
1917 }
1918 }
1920 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1922 if (tree.encl != null) {
1923 // We are seeing a qualified new, of the form
1924 // <expr>.new C <...> (...) ...
1925 // In this case, we let clazz stand for the name of the
1926 // allocated class C prefixed with the type of the qualifier
1927 // expression, so that we can
1928 // resolve it with standard techniques later. I.e., if
1929 // <expr> has type T, then <expr>.new C <...> (...)
1930 // yields a clazz T.C.
1931 Type encltype = chk.checkRefType(tree.encl.pos(),
1932 attribExpr(tree.encl, env));
1933 // TODO 308: in <expr>.new C, do we also want to add the type annotations
1934 // from expr to the combined type, or not? Yes, do this.
1935 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1936 ((JCIdent) clazzid).name);
1938 if (clazz.hasTag(ANNOTATED_TYPE)) {
1939 JCAnnotatedType annoType = (JCAnnotatedType) clazz;
1940 List<JCAnnotation> annos = annoType.annotations;
1942 if (annoType.underlyingType.hasTag(TYPEAPPLY)) {
1943 clazzid1 = make.at(tree.pos).
1944 TypeApply(clazzid1,
1945 ((JCTypeApply) clazz).arguments);
1946 }
1948 clazzid1 = make.at(tree.pos).
1949 AnnotatedType(annos, clazzid1);
1950 } else if (clazz.hasTag(TYPEAPPLY)) {
1951 clazzid1 = make.at(tree.pos).
1952 TypeApply(clazzid1,
1953 ((JCTypeApply) clazz).arguments);
1954 }
1956 clazz = clazzid1;
1957 }
1959 // Attribute clazz expression and store
1960 // symbol + type back into the attributed tree.
1961 Type clazztype = TreeInfo.isEnumInit(env.tree) ?
1962 attribIdentAsEnumType(env, (JCIdent)clazz) :
1963 attribType(clazz, env);
1965 clazztype = chk.checkDiamond(tree, clazztype);
1966 chk.validate(clazz, localEnv);
1967 if (tree.encl != null) {
1968 // We have to work in this case to store
1969 // symbol + type back into the attributed tree.
1970 tree.clazz.type = clazztype;
1971 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1972 clazzid.type = ((JCIdent) clazzid).sym.type;
1973 if (annoclazzid != null) {
1974 annoclazzid.type = clazzid.type;
1975 }
1976 if (!clazztype.isErroneous()) {
1977 if (cdef != null && clazztype.tsym.isInterface()) {
1978 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1979 } else if (clazztype.tsym.isStatic()) {
1980 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1981 }
1982 }
1983 } else if (!clazztype.tsym.isInterface() &&
1984 clazztype.getEnclosingType().hasTag(CLASS)) {
1985 // Check for the existence of an apropos outer instance
1986 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1987 }
1989 // Attribute constructor arguments.
1990 List<Type> argtypes = attribArgs(tree.args, localEnv);
1991 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1993 // If we have made no mistakes in the class type...
1994 if (clazztype.hasTag(CLASS)) {
1995 // Enums may not be instantiated except implicitly
1996 if (allowEnums &&
1997 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1998 (!env.tree.hasTag(VARDEF) ||
1999 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
2000 ((JCVariableDecl) env.tree).init != tree))
2001 log.error(tree.pos(), "enum.cant.be.instantiated");
2002 // Check that class is not abstract
2003 if (cdef == null &&
2004 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
2005 log.error(tree.pos(), "abstract.cant.be.instantiated",
2006 clazztype.tsym);
2007 } else if (cdef != null && clazztype.tsym.isInterface()) {
2008 // Check that no constructor arguments are given to
2009 // anonymous classes implementing an interface
2010 if (!argtypes.isEmpty())
2011 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
2013 if (!typeargtypes.isEmpty())
2014 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
2016 // Error recovery: pretend no arguments were supplied.
2017 argtypes = List.nil();
2018 typeargtypes = List.nil();
2019 } else if (TreeInfo.isDiamond(tree)) {
2020 ClassType site = new ClassType(clazztype.getEnclosingType(),
2021 clazztype.tsym.type.getTypeArguments(),
2022 clazztype.tsym);
2024 Env<AttrContext> diamondEnv = localEnv.dup(tree);
2025 diamondEnv.info.selectSuper = cdef != null;
2026 diamondEnv.info.pendingResolutionPhase = null;
2028 //if the type of the instance creation expression is a class type
2029 //apply method resolution inference (JLS 15.12.2.7). The return type
2030 //of the resolved constructor will be a partially instantiated type
2031 Symbol constructor = rs.resolveDiamond(tree.pos(),
2032 diamondEnv,
2033 site,
2034 argtypes,
2035 typeargtypes);
2036 tree.constructor = constructor.baseSymbol();
2038 final TypeSymbol csym = clazztype.tsym;
2039 ResultInfo diamondResult = new ResultInfo(MTH, newMethodTemplate(resultInfo.pt, argtypes, typeargtypes), new Check.NestedCheckContext(resultInfo.checkContext) {
2040 @Override
2041 public void report(DiagnosticPosition _unused, JCDiagnostic details) {
2042 enclosingContext.report(tree.clazz,
2043 diags.fragment("cant.apply.diamond.1", diags.fragment("diamond", csym), details));
2044 }
2045 });
2046 Type constructorType = tree.constructorType = types.createErrorType(clazztype);
2047 constructorType = checkId(tree, site,
2048 constructor,
2049 diamondEnv,
2050 diamondResult);
2052 tree.clazz.type = types.createErrorType(clazztype);
2053 if (!constructorType.isErroneous()) {
2054 tree.clazz.type = clazztype = constructorType.getReturnType();
2055 tree.constructorType = types.createMethodTypeWithReturn(constructorType, syms.voidType);
2056 }
2057 clazztype = chk.checkClassType(tree.clazz, tree.clazz.type, true);
2058 }
2060 // Resolve the called constructor under the assumption
2061 // that we are referring to a superclass instance of the
2062 // current instance (JLS ???).
2063 else {
2064 //the following code alters some of the fields in the current
2065 //AttrContext - hence, the current context must be dup'ed in
2066 //order to avoid downstream failures
2067 Env<AttrContext> rsEnv = localEnv.dup(tree);
2068 rsEnv.info.selectSuper = cdef != null;
2069 rsEnv.info.pendingResolutionPhase = null;
2070 tree.constructor = rs.resolveConstructor(
2071 tree.pos(), rsEnv, clazztype, argtypes, typeargtypes);
2072 if (cdef == null) { //do not check twice!
2073 tree.constructorType = checkId(tree,
2074 clazztype,
2075 tree.constructor,
2076 rsEnv,
2077 new ResultInfo(MTH, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2078 if (rsEnv.info.lastResolveVarargs())
2079 Assert.check(tree.constructorType.isErroneous() || tree.varargsElement != null);
2080 }
2081 findDiamondIfNeeded(localEnv, tree, clazztype);
2082 }
2084 if (cdef != null) {
2085 // We are seeing an anonymous class instance creation.
2086 // In this case, the class instance creation
2087 // expression
2088 //
2089 // E.new <typeargs1>C<typargs2>(args) { ... }
2090 //
2091 // is represented internally as
2092 //
2093 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
2094 //
2095 // This expression is then *transformed* as follows:
2096 //
2097 // (1) add a STATIC flag to the class definition
2098 // if the current environment is static
2099 // (2) add an extends or implements clause
2100 // (3) add a constructor.
2101 //
2102 // For instance, if C is a class, and ET is the type of E,
2103 // the expression
2104 //
2105 // E.new <typeargs1>C<typargs2>(args) { ... }
2106 //
2107 // is translated to (where X is a fresh name and typarams is the
2108 // parameter list of the super constructor):
2109 //
2110 // new <typeargs1>X(<*nullchk*>E, args) where
2111 // X extends C<typargs2> {
2112 // <typarams> X(ET e, args) {
2113 // e.<typeargs1>super(args)
2114 // }
2115 // ...
2116 // }
2117 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
2119 if (clazztype.tsym.isInterface()) {
2120 cdef.implementing = List.of(clazz);
2121 } else {
2122 cdef.extending = clazz;
2123 }
2125 attribStat(cdef, localEnv);
2127 checkLambdaCandidate(tree, cdef.sym, clazztype);
2129 // If an outer instance is given,
2130 // prefix it to the constructor arguments
2131 // and delete it from the new expression
2132 if (tree.encl != null && !clazztype.tsym.isInterface()) {
2133 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
2134 argtypes = argtypes.prepend(tree.encl.type);
2135 tree.encl = null;
2136 }
2138 // Reassign clazztype and recompute constructor.
2139 clazztype = cdef.sym.type;
2140 Symbol sym = tree.constructor = rs.resolveConstructor(
2141 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
2142 Assert.check(sym.kind < AMBIGUOUS);
2143 tree.constructor = sym;
2144 tree.constructorType = checkId(tree,
2145 clazztype,
2146 tree.constructor,
2147 localEnv,
2148 new ResultInfo(VAL, newMethodTemplate(syms.voidType, argtypes, typeargtypes)));
2149 } else {
2150 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
2151 checkForDeclarationAnnotations(((JCAnnotatedType) tree.clazz).annotations,
2152 tree.clazz.type.tsym);
2153 }
2154 }
2156 if (tree.constructor != null && tree.constructor.kind == MTH)
2157 owntype = clazztype;
2158 }
2159 result = check(tree, owntype, VAL, resultInfo);
2160 chk.validate(tree.typeargs, localEnv);
2161 }
2162 //where
2163 void findDiamondIfNeeded(Env<AttrContext> env, JCNewClass tree, Type clazztype) {
2164 if (tree.def == null &&
2165 !clazztype.isErroneous() &&
2166 clazztype.getTypeArguments().nonEmpty() &&
2167 findDiamonds) {
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 types.isAssignable(inferred, pt().hasTag(NONE) ? polyPt : pt(), types.noWarnings)) {
2181 String key = types.isSameType(clazztype, inferred) ?
2182 "diamond.redundant.args" :
2183 "diamond.redundant.args.1";
2184 log.warning(tree.clazz.pos(), key, clazztype, inferred);
2185 }
2186 } finally {
2187 ta.arguments = prevTypeargs;
2188 }
2189 }
2190 }
2192 private void checkLambdaCandidate(JCNewClass tree, ClassSymbol csym, Type clazztype) {
2193 if (allowLambda &&
2194 identifyLambdaCandidate &&
2195 clazztype.hasTag(CLASS) &&
2196 !pt().hasTag(NONE) &&
2197 types.isFunctionalInterface(clazztype.tsym)) {
2198 Symbol descriptor = types.findDescriptorSymbol(clazztype.tsym);
2199 int count = 0;
2200 boolean found = false;
2201 for (Symbol sym : csym.members().getElements()) {
2202 if ((sym.flags() & SYNTHETIC) != 0 ||
2203 sym.isConstructor()) continue;
2204 count++;
2205 if (sym.kind != MTH ||
2206 !sym.name.equals(descriptor.name)) continue;
2207 Type mtype = types.memberType(clazztype, sym);
2208 if (types.overrideEquivalent(mtype, types.memberType(clazztype, descriptor))) {
2209 found = true;
2210 }
2211 }
2212 if (found && count == 1) {
2213 log.note(tree.def, "potential.lambda.found");
2214 }
2215 }
2216 }
2218 private void checkForDeclarationAnnotations(List<? extends JCAnnotation> annotations,
2219 Symbol sym) {
2220 // Ensure that no declaration annotations are present.
2221 // Note that a tree type might be an AnnotatedType with
2222 // empty annotations, if only declaration annotations were given.
2223 // This method will raise an error for such a type.
2224 for (JCAnnotation ai : annotations) {
2225 if (TypeAnnotations.annotationType(syms, names, ai.attribute, sym) == TypeAnnotations.AnnotationType.DECLARATION) {
2226 log.error(ai.pos(), "annotation.type.not.applicable");
2227 }
2228 }
2229 }
2232 /** Make an attributed null check tree.
2233 */
2234 public JCExpression makeNullCheck(JCExpression arg) {
2235 // optimization: X.this is never null; skip null check
2236 Name name = TreeInfo.name(arg);
2237 if (name == names._this || name == names._super) return arg;
2239 JCTree.Tag optag = NULLCHK;
2240 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
2241 tree.operator = syms.nullcheck;
2242 tree.type = arg.type;
2243 return tree;
2244 }
2246 public void visitNewArray(JCNewArray tree) {
2247 Type owntype = types.createErrorType(tree.type);
2248 Env<AttrContext> localEnv = env.dup(tree);
2249 Type elemtype;
2250 if (tree.elemtype != null) {
2251 elemtype = attribType(tree.elemtype, localEnv);
2252 chk.validate(tree.elemtype, localEnv);
2253 owntype = elemtype;
2254 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
2255 attribExpr(l.head, localEnv, syms.intType);
2256 owntype = new ArrayType(owntype, syms.arrayClass);
2257 }
2258 if (tree.elemtype.hasTag(ANNOTATED_TYPE)) {
2259 checkForDeclarationAnnotations(((JCAnnotatedType) tree.elemtype).annotations,
2260 tree.elemtype.type.tsym);
2261 }
2262 } else {
2263 // we are seeing an untyped aggregate { ... }
2264 // this is allowed only if the prototype is an array
2265 if (pt().hasTag(ARRAY)) {
2266 elemtype = types.elemtype(pt());
2267 } else {
2268 if (!pt().hasTag(ERROR)) {
2269 log.error(tree.pos(), "illegal.initializer.for.type",
2270 pt());
2271 }
2272 elemtype = types.createErrorType(pt());
2273 }
2274 }
2275 if (tree.elems != null) {
2276 attribExprs(tree.elems, localEnv, elemtype);
2277 owntype = new ArrayType(elemtype, syms.arrayClass);
2278 }
2279 if (!types.isReifiable(elemtype))
2280 log.error(tree.pos(), "generic.array.creation");
2281 result = check(tree, owntype, VAL, resultInfo);
2282 }
2284 /*
2285 * A lambda expression can only be attributed when a target-type is available.
2286 * In addition, if the target-type is that of a functional interface whose
2287 * descriptor contains inference variables in argument position the lambda expression
2288 * is 'stuck' (see DeferredAttr).
2289 */
2290 @Override
2291 public void visitLambda(final JCLambda that) {
2292 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2293 if (pt().hasTag(NONE)) {
2294 //lambda only allowed in assignment or method invocation/cast context
2295 log.error(that.pos(), "unexpected.lambda");
2296 }
2297 result = that.type = types.createErrorType(pt());
2298 return;
2299 }
2300 //create an environment for attribution of the lambda expression
2301 final Env<AttrContext> localEnv = lambdaEnv(that, env);
2302 boolean needsRecovery =
2303 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.CHECK;
2304 try {
2305 Type target = pt();
2306 List<Type> explicitParamTypes = null;
2307 if (that.paramKind == JCLambda.ParameterKind.EXPLICIT) {
2308 //attribute lambda parameters
2309 attribStats(that.params, localEnv);
2310 explicitParamTypes = TreeInfo.types(that.params);
2311 target = infer.instantiateFunctionalInterface(that, target, explicitParamTypes, resultInfo.checkContext);
2312 }
2314 Type lambdaType;
2315 if (pt() != Type.recoveryType) {
2316 target = targetChecker.visit(target, that);
2317 lambdaType = types.findDescriptorType(target);
2318 chk.checkFunctionalInterface(that, target);
2319 } else {
2320 target = Type.recoveryType;
2321 lambdaType = fallbackDescriptorType(that);
2322 }
2324 setFunctionalInfo(that, pt(), lambdaType, target, resultInfo.checkContext.inferenceContext());
2326 if (lambdaType.hasTag(FORALL)) {
2327 //lambda expression target desc cannot be a generic method
2328 resultInfo.checkContext.report(that, diags.fragment("invalid.generic.lambda.target",
2329 lambdaType, kindName(target.tsym), target.tsym));
2330 result = that.type = types.createErrorType(pt());
2331 return;
2332 }
2334 if (that.paramKind == JCLambda.ParameterKind.IMPLICIT) {
2335 //add param type info in the AST
2336 List<Type> actuals = lambdaType.getParameterTypes();
2337 List<JCVariableDecl> params = that.params;
2339 boolean arityMismatch = false;
2341 while (params.nonEmpty()) {
2342 if (actuals.isEmpty()) {
2343 //not enough actuals to perform lambda parameter inference
2344 arityMismatch = true;
2345 }
2346 //reset previously set info
2347 Type argType = arityMismatch ?
2348 syms.errType :
2349 actuals.head;
2350 params.head.vartype = make.at(params.head).Type(argType);
2351 params.head.sym = null;
2352 actuals = actuals.isEmpty() ?
2353 actuals :
2354 actuals.tail;
2355 params = params.tail;
2356 }
2358 //attribute lambda parameters
2359 attribStats(that.params, localEnv);
2361 if (arityMismatch) {
2362 resultInfo.checkContext.report(that, diags.fragment("incompatible.arg.types.in.lambda"));
2363 result = that.type = types.createErrorType(target);
2364 return;
2365 }
2366 }
2368 //from this point on, no recovery is needed; if we are in assignment context
2369 //we will be able to attribute the whole lambda body, regardless of errors;
2370 //if we are in a 'check' method context, and the lambda is not compatible
2371 //with the target-type, it will be recovered anyway in Attr.checkId
2372 needsRecovery = false;
2374 FunctionalReturnContext funcContext = that.getBodyKind() == JCLambda.BodyKind.EXPRESSION ?
2375 new ExpressionLambdaReturnContext((JCExpression)that.getBody(), resultInfo.checkContext) :
2376 new FunctionalReturnContext(resultInfo.checkContext);
2378 ResultInfo bodyResultInfo = lambdaType.getReturnType() == Type.recoveryType ?
2379 recoveryInfo :
2380 new ResultInfo(VAL, lambdaType.getReturnType(), funcContext);
2381 localEnv.info.returnResult = bodyResultInfo;
2383 Log.DeferredDiagnosticHandler lambdaDeferredHandler = new Log.DeferredDiagnosticHandler(log);
2384 try {
2385 if (that.getBodyKind() == JCLambda.BodyKind.EXPRESSION) {
2386 attribTree(that.getBody(), localEnv, bodyResultInfo);
2387 } else {
2388 JCBlock body = (JCBlock)that.body;
2389 attribStats(body.stats, localEnv);
2390 }
2392 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.SPECULATIVE) {
2393 //check for errors in lambda body
2394 for (JCDiagnostic deferredDiag : lambdaDeferredHandler.getDiagnostics()) {
2395 if (deferredDiag.getKind() == JCDiagnostic.Kind.ERROR) {
2396 resultInfo.checkContext
2397 .report(that, diags.fragment("bad.arg.types.in.lambda", TreeInfo.types(that.params),
2398 deferredDiag)); //hidden diag parameter
2399 //we mark the lambda as erroneous - this is crucial in the recovery step
2400 //as parameter-dependent type error won't be reported in that stage,
2401 //meaning that a lambda will be deemed erroeneous only if there is
2402 //a target-independent error (which will cause method diagnostic
2403 //to be skipped).
2404 result = that.type = types.createErrorType(target);
2405 return;
2406 }
2407 }
2408 }
2409 } finally {
2410 lambdaDeferredHandler.reportDeferredDiagnostics();
2411 log.popDiagnosticHandler(lambdaDeferredHandler);
2412 }
2414 result = check(that, target, VAL, resultInfo);
2416 boolean isSpeculativeRound =
2417 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2419 postAttr(that);
2420 flow.analyzeLambda(env, that, make, isSpeculativeRound);
2422 checkLambdaCompatible(that, lambdaType, resultInfo.checkContext, isSpeculativeRound);
2424 if (!isSpeculativeRound) {
2425 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), lambdaType, target);
2426 }
2427 result = check(that, target, VAL, resultInfo);
2428 } catch (Types.FunctionDescriptorLookupError ex) {
2429 JCDiagnostic cause = ex.getDiagnostic();
2430 resultInfo.checkContext.report(that, cause);
2431 result = that.type = types.createErrorType(pt());
2432 return;
2433 } finally {
2434 localEnv.info.scope.leave();
2435 if (needsRecovery) {
2436 attribTree(that, env, recoveryInfo);
2437 }
2438 }
2439 }
2440 //where
2441 Types.MapVisitor<DiagnosticPosition> targetChecker = new Types.MapVisitor<DiagnosticPosition>() {
2443 @Override
2444 public Type visitClassType(ClassType t, DiagnosticPosition pos) {
2445 return t.isCompound() ?
2446 visitIntersectionClassType((IntersectionClassType)t, pos) : t;
2447 }
2449 public Type visitIntersectionClassType(IntersectionClassType ict, DiagnosticPosition pos) {
2450 Symbol desc = types.findDescriptorSymbol(makeNotionalInterface(ict));
2451 Type target = null;
2452 for (Type bound : ict.getExplicitComponents()) {
2453 TypeSymbol boundSym = bound.tsym;
2454 if (types.isFunctionalInterface(boundSym) &&
2455 types.findDescriptorSymbol(boundSym) == desc) {
2456 target = bound;
2457 } else if (!boundSym.isInterface() || (boundSym.flags() & ANNOTATION) != 0) {
2458 //bound must be an interface
2459 reportIntersectionError(pos, "not.an.intf.component", boundSym);
2460 }
2461 }
2462 return target != null ?
2463 target :
2464 ict.getExplicitComponents().head; //error recovery
2465 }
2467 private TypeSymbol makeNotionalInterface(IntersectionClassType ict) {
2468 ListBuffer<Type> targs = ListBuffer.lb();
2469 ListBuffer<Type> supertypes = ListBuffer.lb();
2470 for (Type i : ict.interfaces_field) {
2471 if (i.isParameterized()) {
2472 targs.appendList(i.tsym.type.allparams());
2473 }
2474 supertypes.append(i.tsym.type);
2475 }
2476 IntersectionClassType notionalIntf =
2477 (IntersectionClassType)types.makeCompoundType(supertypes.toList());
2478 notionalIntf.allparams_field = targs.toList();
2479 notionalIntf.tsym.flags_field |= INTERFACE;
2480 return notionalIntf.tsym;
2481 }
2483 private void reportIntersectionError(DiagnosticPosition pos, String key, Object... args) {
2484 resultInfo.checkContext.report(pos, diags.fragment("bad.intersection.target.for.functional.expr",
2485 diags.fragment(key, args)));
2486 }
2487 };
2489 private Type fallbackDescriptorType(JCExpression tree) {
2490 switch (tree.getTag()) {
2491 case LAMBDA:
2492 JCLambda lambda = (JCLambda)tree;
2493 List<Type> argtypes = List.nil();
2494 for (JCVariableDecl param : lambda.params) {
2495 argtypes = param.vartype != null ?
2496 argtypes.append(param.vartype.type) :
2497 argtypes.append(syms.errType);
2498 }
2499 return new MethodType(argtypes, Type.recoveryType,
2500 List.of(syms.throwableType), syms.methodClass);
2501 case REFERENCE:
2502 return new MethodType(List.<Type>nil(), Type.recoveryType,
2503 List.of(syms.throwableType), syms.methodClass);
2504 default:
2505 Assert.error("Cannot get here!");
2506 }
2507 return null;
2508 }
2510 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2511 final InferenceContext inferenceContext, final Type... ts) {
2512 checkAccessibleTypes(pos, env, inferenceContext, List.from(ts));
2513 }
2515 private void checkAccessibleTypes(final DiagnosticPosition pos, final Env<AttrContext> env,
2516 final InferenceContext inferenceContext, final List<Type> ts) {
2517 if (inferenceContext.free(ts)) {
2518 inferenceContext.addFreeTypeListener(ts, new FreeTypeListener() {
2519 @Override
2520 public void typesInferred(InferenceContext inferenceContext) {
2521 checkAccessibleTypes(pos, env, inferenceContext, inferenceContext.asInstTypes(ts));
2522 }
2523 });
2524 } else {
2525 for (Type t : ts) {
2526 rs.checkAccessibleType(env, t);
2527 }
2528 }
2529 }
2531 /**
2532 * Lambda/method reference have a special check context that ensures
2533 * that i.e. a lambda return type is compatible with the expected
2534 * type according to both the inherited context and the assignment
2535 * context.
2536 */
2537 class FunctionalReturnContext extends Check.NestedCheckContext {
2539 FunctionalReturnContext(CheckContext enclosingContext) {
2540 super(enclosingContext);
2541 }
2543 @Override
2544 public boolean compatible(Type found, Type req, Warner warn) {
2545 //return type must be compatible in both current context and assignment context
2546 return chk.basicHandler.compatible(found, inferenceContext().asFree(req), warn);
2547 }
2549 @Override
2550 public void report(DiagnosticPosition pos, JCDiagnostic details) {
2551 enclosingContext.report(pos, diags.fragment("incompatible.ret.type.in.lambda", details));
2552 }
2553 }
2555 class ExpressionLambdaReturnContext extends FunctionalReturnContext {
2557 JCExpression expr;
2559 ExpressionLambdaReturnContext(JCExpression expr, CheckContext enclosingContext) {
2560 super(enclosingContext);
2561 this.expr = expr;
2562 }
2564 @Override
2565 public boolean compatible(Type found, Type req, Warner warn) {
2566 //a void return is compatible with an expression statement lambda
2567 return TreeInfo.isExpressionStatement(expr) && req.hasTag(VOID) ||
2568 super.compatible(found, req, warn);
2569 }
2570 }
2572 /**
2573 * Lambda compatibility. Check that given return types, thrown types, parameter types
2574 * are compatible with the expected functional interface descriptor. This means that:
2575 * (i) parameter types must be identical to those of the target descriptor; (ii) return
2576 * types must be compatible with the return type of the expected descriptor;
2577 * (iii) thrown types must be 'included' in the thrown types list of the expected
2578 * descriptor.
2579 */
2580 private void checkLambdaCompatible(JCLambda tree, Type descriptor, CheckContext checkContext, boolean speculativeAttr) {
2581 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2583 //return values have already been checked - but if lambda has no return
2584 //values, we must ensure that void/value compatibility is correct;
2585 //this amounts at checking that, if a lambda body can complete normally,
2586 //the descriptor's return type must be void
2587 if (tree.getBodyKind() == JCLambda.BodyKind.STATEMENT && tree.canCompleteNormally &&
2588 !returnType.hasTag(VOID) && returnType != Type.recoveryType) {
2589 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.lambda",
2590 diags.fragment("missing.ret.val", returnType)));
2591 }
2593 List<Type> argTypes = checkContext.inferenceContext().asFree(descriptor.getParameterTypes());
2594 if (!types.isSameTypes(argTypes, TreeInfo.types(tree.params))) {
2595 checkContext.report(tree, diags.fragment("incompatible.arg.types.in.lambda"));
2596 }
2598 if (!speculativeAttr) {
2599 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2600 if (chk.unhandled(tree.inferredThrownTypes == null ? List.<Type>nil() : tree.inferredThrownTypes, thrownTypes).nonEmpty()) {
2601 log.error(tree, "incompatible.thrown.types.in.lambda", tree.inferredThrownTypes);
2602 }
2603 }
2604 }
2606 private Env<AttrContext> lambdaEnv(JCLambda that, Env<AttrContext> env) {
2607 Env<AttrContext> lambdaEnv;
2608 Symbol owner = env.info.scope.owner;
2609 if (owner.kind == VAR && owner.owner.kind == TYP) {
2610 //field initializer
2611 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dupUnshared()));
2612 lambdaEnv.info.scope.owner =
2613 new MethodSymbol(0, names.empty, null,
2614 env.info.scope.owner);
2615 } else {
2616 lambdaEnv = env.dup(that, env.info.dup(env.info.scope.dup()));
2617 }
2618 return lambdaEnv;
2619 }
2621 @Override
2622 public void visitReference(final JCMemberReference that) {
2623 if (pt().isErroneous() || (pt().hasTag(NONE) && pt() != Type.recoveryType)) {
2624 if (pt().hasTag(NONE)) {
2625 //method reference only allowed in assignment or method invocation/cast context
2626 log.error(that.pos(), "unexpected.mref");
2627 }
2628 result = that.type = types.createErrorType(pt());
2629 return;
2630 }
2631 final Env<AttrContext> localEnv = env.dup(that);
2632 try {
2633 //attribute member reference qualifier - if this is a constructor
2634 //reference, the expected kind must be a type
2635 Type exprType = attribTree(that.expr, env, memberReferenceQualifierResult(that));
2637 if (that.getMode() == JCMemberReference.ReferenceMode.NEW) {
2638 exprType = chk.checkConstructorRefType(that.expr, exprType);
2639 }
2641 if (exprType.isErroneous()) {
2642 //if the qualifier expression contains problems,
2643 //give up attribution of method reference
2644 result = that.type = exprType;
2645 return;
2646 }
2648 if (TreeInfo.isStaticSelector(that.expr, names)) {
2649 //if the qualifier is a type, validate it; raw warning check is
2650 //omitted as we don't know at this stage as to whether this is a
2651 //raw selector (because of inference)
2652 chk.validate(that.expr, env, false);
2653 }
2655 //attrib type-arguments
2656 List<Type> typeargtypes = List.nil();
2657 if (that.typeargs != null) {
2658 typeargtypes = attribTypes(that.typeargs, localEnv);
2659 }
2661 Type target;
2662 Type desc;
2663 if (pt() != Type.recoveryType) {
2664 target = targetChecker.visit(pt(), that);
2665 desc = types.findDescriptorType(target);
2666 chk.checkFunctionalInterface(that, target);
2667 } else {
2668 target = Type.recoveryType;
2669 desc = fallbackDescriptorType(that);
2670 }
2672 setFunctionalInfo(that, pt(), desc, target, resultInfo.checkContext.inferenceContext());
2673 List<Type> argtypes = desc.getParameterTypes();
2675 Pair<Symbol, Resolve.ReferenceLookupHelper> refResult =
2676 rs.resolveMemberReference(that.pos(), localEnv, that,
2677 that.expr.type, that.name, argtypes, typeargtypes, true, rs.resolveMethodCheck);
2679 Symbol refSym = refResult.fst;
2680 Resolve.ReferenceLookupHelper lookupHelper = refResult.snd;
2682 if (refSym.kind != MTH) {
2683 boolean targetError;
2684 switch (refSym.kind) {
2685 case ABSENT_MTH:
2686 targetError = false;
2687 break;
2688 case WRONG_MTH:
2689 case WRONG_MTHS:
2690 case AMBIGUOUS:
2691 case HIDDEN:
2692 case STATICERR:
2693 case MISSING_ENCL:
2694 targetError = true;
2695 break;
2696 default:
2697 Assert.error("unexpected result kind " + refSym.kind);
2698 targetError = false;
2699 }
2701 JCDiagnostic detailsDiag = ((Resolve.ResolveError)refSym).getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT,
2702 that, exprType.tsym, exprType, that.name, argtypes, typeargtypes);
2704 JCDiagnostic.DiagnosticType diagKind = targetError ?
2705 JCDiagnostic.DiagnosticType.FRAGMENT : JCDiagnostic.DiagnosticType.ERROR;
2707 JCDiagnostic diag = diags.create(diagKind, log.currentSource(), that,
2708 "invalid.mref", Kinds.kindName(that.getMode()), detailsDiag);
2710 if (targetError && target == Type.recoveryType) {
2711 //a target error doesn't make sense during recovery stage
2712 //as we don't know what actual parameter types are
2713 result = that.type = target;
2714 return;
2715 } else {
2716 if (targetError) {
2717 resultInfo.checkContext.report(that, diag);
2718 } else {
2719 log.report(diag);
2720 }
2721 result = that.type = types.createErrorType(target);
2722 return;
2723 }
2724 }
2726 that.sym = refSym.baseSymbol();
2727 that.kind = lookupHelper.referenceKind(that.sym);
2728 that.ownerAccessible = rs.isAccessible(localEnv, that.sym.enclClass());
2730 if (desc.getReturnType() == Type.recoveryType) {
2731 // stop here
2732 result = that.type = target;
2733 return;
2734 }
2736 if (resultInfo.checkContext.deferredAttrContext().mode == AttrMode.CHECK) {
2738 if (that.getMode() == ReferenceMode.INVOKE &&
2739 TreeInfo.isStaticSelector(that.expr, names) &&
2740 that.kind.isUnbound() &&
2741 !desc.getParameterTypes().head.isParameterized()) {
2742 chk.checkRaw(that.expr, localEnv);
2743 }
2745 if (!that.kind.isUnbound() &&
2746 that.getMode() == ReferenceMode.INVOKE &&
2747 TreeInfo.isStaticSelector(that.expr, names) &&
2748 !that.sym.isStatic()) {
2749 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2750 diags.fragment("non-static.cant.be.ref", Kinds.kindName(refSym), refSym));
2751 result = that.type = types.createErrorType(target);
2752 return;
2753 }
2755 if (that.kind.isUnbound() &&
2756 that.getMode() == ReferenceMode.INVOKE &&
2757 TreeInfo.isStaticSelector(that.expr, names) &&
2758 that.sym.isStatic()) {
2759 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2760 diags.fragment("static.method.in.unbound.lookup", Kinds.kindName(refSym), refSym));
2761 result = that.type = types.createErrorType(target);
2762 return;
2763 }
2765 if (that.sym.isStatic() && TreeInfo.isStaticSelector(that.expr, names) &&
2766 exprType.getTypeArguments().nonEmpty()) {
2767 //static ref with class type-args
2768 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2769 diags.fragment("static.mref.with.targs"));
2770 result = that.type = types.createErrorType(target);
2771 return;
2772 }
2774 if (that.sym.isStatic() && !TreeInfo.isStaticSelector(that.expr, names) &&
2775 !that.kind.isUnbound()) {
2776 //no static bound mrefs
2777 log.error(that.expr.pos(), "invalid.mref", Kinds.kindName(that.getMode()),
2778 diags.fragment("static.bound.mref"));
2779 result = that.type = types.createErrorType(target);
2780 return;
2781 }
2783 if (!refSym.isStatic() && that.kind == JCMemberReference.ReferenceKind.SUPER) {
2784 // Check that super-qualified symbols are not abstract (JLS)
2785 rs.checkNonAbstract(that.pos(), that.sym);
2786 }
2787 }
2789 that.sym = refSym.baseSymbol();
2790 that.kind = lookupHelper.referenceKind(that.sym);
2792 ResultInfo checkInfo =
2793 resultInfo.dup(newMethodTemplate(
2794 desc.getReturnType().hasTag(VOID) ? Type.noType : desc.getReturnType(),
2795 lookupHelper.argtypes,
2796 typeargtypes));
2798 Type refType = checkId(that, lookupHelper.site, refSym, localEnv, checkInfo);
2800 if (!refType.isErroneous()) {
2801 refType = types.createMethodTypeWithReturn(refType,
2802 adjustMethodReturnType(lookupHelper.site, that.name, checkInfo.pt.getParameterTypes(), refType.getReturnType()));
2803 }
2805 //go ahead with standard method reference compatibility check - note that param check
2806 //is a no-op (as this has been taken care during method applicability)
2807 boolean isSpeculativeRound =
2808 resultInfo.checkContext.deferredAttrContext().mode == DeferredAttr.AttrMode.SPECULATIVE;
2809 checkReferenceCompatible(that, desc, refType, resultInfo.checkContext, isSpeculativeRound);
2810 if (!isSpeculativeRound) {
2811 checkAccessibleTypes(that, localEnv, resultInfo.checkContext.inferenceContext(), desc, target);
2812 }
2813 result = check(that, target, VAL, resultInfo);
2814 } catch (Types.FunctionDescriptorLookupError ex) {
2815 JCDiagnostic cause = ex.getDiagnostic();
2816 resultInfo.checkContext.report(that, cause);
2817 result = that.type = types.createErrorType(pt());
2818 return;
2819 }
2820 }
2821 //where
2822 ResultInfo memberReferenceQualifierResult(JCMemberReference tree) {
2823 //if this is a constructor reference, the expected kind must be a type
2824 return new ResultInfo(tree.getMode() == ReferenceMode.INVOKE ? VAL | TYP : TYP, Type.noType);
2825 }
2828 @SuppressWarnings("fallthrough")
2829 void checkReferenceCompatible(JCMemberReference tree, Type descriptor, Type refType, CheckContext checkContext, boolean speculativeAttr) {
2830 Type returnType = checkContext.inferenceContext().asFree(descriptor.getReturnType());
2832 Type resType;
2833 switch (tree.getMode()) {
2834 case NEW:
2835 if (!tree.expr.type.isRaw()) {
2836 resType = tree.expr.type;
2837 break;
2838 }
2839 default:
2840 resType = refType.getReturnType();
2841 }
2843 Type incompatibleReturnType = resType;
2845 if (returnType.hasTag(VOID)) {
2846 incompatibleReturnType = null;
2847 }
2849 if (!returnType.hasTag(VOID) && !resType.hasTag(VOID)) {
2850 if (resType.isErroneous() ||
2851 new FunctionalReturnContext(checkContext).compatible(resType, returnType, types.noWarnings)) {
2852 incompatibleReturnType = null;
2853 }
2854 }
2856 if (incompatibleReturnType != null) {
2857 checkContext.report(tree, diags.fragment("incompatible.ret.type.in.mref",
2858 diags.fragment("inconvertible.types", resType, descriptor.getReturnType())));
2859 }
2861 if (!speculativeAttr) {
2862 List<Type> thrownTypes = checkContext.inferenceContext().asFree(descriptor.getThrownTypes());
2863 if (chk.unhandled(refType.getThrownTypes(), thrownTypes).nonEmpty()) {
2864 log.error(tree, "incompatible.thrown.types.in.mref", refType.getThrownTypes());
2865 }
2866 }
2867 }
2869 /**
2870 * Set functional type info on the underlying AST. Note: as the target descriptor
2871 * might contain inference variables, we might need to register an hook in the
2872 * current inference context.
2873 */
2874 private void setFunctionalInfo(final JCFunctionalExpression fExpr, final Type pt,
2875 final Type descriptorType, final Type primaryTarget, InferenceContext inferenceContext) {
2876 if (inferenceContext.free(descriptorType)) {
2877 inferenceContext.addFreeTypeListener(List.of(pt, descriptorType), new FreeTypeListener() {
2878 public void typesInferred(InferenceContext inferenceContext) {
2879 setFunctionalInfo(fExpr, pt, inferenceContext.asInstType(descriptorType),
2880 inferenceContext.asInstType(primaryTarget), inferenceContext);
2881 }
2882 });
2883 } else {
2884 ListBuffer<TypeSymbol> targets = ListBuffer.lb();
2885 if (pt.hasTag(CLASS)) {
2886 if (pt.isCompound()) {
2887 targets.append(primaryTarget.tsym); //this goes first
2888 for (Type t : ((IntersectionClassType)pt()).interfaces_field) {
2889 if (t != primaryTarget) {
2890 targets.append(t.tsym);
2891 }
2892 }
2893 } else {
2894 targets.append(pt.tsym);
2895 }
2896 }
2897 fExpr.targets = targets.toList();
2898 fExpr.descriptorType = descriptorType;
2899 }
2900 }
2902 public void visitParens(JCParens tree) {
2903 Type owntype = attribTree(tree.expr, env, resultInfo);
2904 result = check(tree, owntype, pkind(), resultInfo);
2905 Symbol sym = TreeInfo.symbol(tree);
2906 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
2907 log.error(tree.pos(), "illegal.start.of.type");
2908 }
2910 public void visitAssign(JCAssign tree) {
2911 Type owntype = attribTree(tree.lhs, env.dup(tree), varInfo);
2912 Type capturedType = capture(owntype);
2913 attribExpr(tree.rhs, env, owntype);
2914 result = check(tree, capturedType, VAL, resultInfo);
2915 }
2917 public void visitAssignop(JCAssignOp tree) {
2918 // Attribute arguments.
2919 Type owntype = attribTree(tree.lhs, env, varInfo);
2920 Type operand = attribExpr(tree.rhs, env);
2921 // Find operator.
2922 Symbol operator = tree.operator = rs.resolveBinaryOperator(
2923 tree.pos(), tree.getTag().noAssignOp(), env,
2924 owntype, operand);
2926 if (operator.kind == MTH &&
2927 !owntype.isErroneous() &&
2928 !operand.isErroneous()) {
2929 chk.checkOperator(tree.pos(),
2930 (OperatorSymbol)operator,
2931 tree.getTag().noAssignOp(),
2932 owntype,
2933 operand);
2934 chk.checkDivZero(tree.rhs.pos(), operator, operand);
2935 chk.checkCastable(tree.rhs.pos(),
2936 operator.type.getReturnType(),
2937 owntype);
2938 }
2939 result = check(tree, owntype, VAL, resultInfo);
2940 }
2942 public void visitUnary(JCUnary tree) {
2943 // Attribute arguments.
2944 Type argtype = (tree.getTag().isIncOrDecUnaryOp())
2945 ? attribTree(tree.arg, env, varInfo)
2946 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
2948 // Find operator.
2949 Symbol operator = tree.operator =
2950 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
2952 Type owntype = types.createErrorType(tree.type);
2953 if (operator.kind == MTH &&
2954 !argtype.isErroneous()) {
2955 owntype = (tree.getTag().isIncOrDecUnaryOp())
2956 ? tree.arg.type
2957 : operator.type.getReturnType();
2958 int opc = ((OperatorSymbol)operator).opcode;
2960 // If the argument is constant, fold it.
2961 if (argtype.constValue() != null) {
2962 Type ctype = cfolder.fold1(opc, argtype);
2963 if (ctype != null) {
2964 owntype = cfolder.coerce(ctype, owntype);
2966 // Remove constant types from arguments to
2967 // conserve space. The parser will fold concatenations
2968 // of string literals; the code here also
2969 // gets rid of intermediate results when some of the
2970 // operands are constant identifiers.
2971 if (tree.arg.type.tsym == syms.stringType.tsym) {
2972 tree.arg.type = syms.stringType;
2973 }
2974 }
2975 }
2976 }
2977 result = check(tree, owntype, VAL, resultInfo);
2978 }
2980 public void visitBinary(JCBinary tree) {
2981 // Attribute arguments.
2982 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
2983 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
2985 // Find operator.
2986 Symbol operator = tree.operator =
2987 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
2989 Type owntype = types.createErrorType(tree.type);
2990 if (operator.kind == MTH &&
2991 !left.isErroneous() &&
2992 !right.isErroneous()) {
2993 owntype = operator.type.getReturnType();
2994 int opc = chk.checkOperator(tree.lhs.pos(),
2995 (OperatorSymbol)operator,
2996 tree.getTag(),
2997 left,
2998 right);
3000 // If both arguments are constants, fold them.
3001 if (left.constValue() != null && right.constValue() != null) {
3002 Type ctype = cfolder.fold2(opc, left, right);
3003 if (ctype != null) {
3004 owntype = cfolder.coerce(ctype, owntype);
3006 // Remove constant types from arguments to
3007 // conserve space. The parser will fold concatenations
3008 // of string literals; the code here also
3009 // gets rid of intermediate results when some of the
3010 // operands are constant identifiers.
3011 if (tree.lhs.type.tsym == syms.stringType.tsym) {
3012 tree.lhs.type = syms.stringType;
3013 }
3014 if (tree.rhs.type.tsym == syms.stringType.tsym) {
3015 tree.rhs.type = syms.stringType;
3016 }
3017 }
3018 }
3020 // Check that argument types of a reference ==, != are
3021 // castable to each other, (JLS???).
3022 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
3023 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
3024 log.error(tree.pos(), "incomparable.types", left, right);
3025 }
3026 }
3028 chk.checkDivZero(tree.rhs.pos(), operator, right);
3029 }
3030 result = check(tree, owntype, VAL, resultInfo);
3031 }
3033 public void visitTypeCast(final JCTypeCast tree) {
3034 Type clazztype = attribType(tree.clazz, env);
3035 chk.validate(tree.clazz, env, false);
3036 //a fresh environment is required for 292 inference to work properly ---
3037 //see Infer.instantiatePolymorphicSignatureInstance()
3038 Env<AttrContext> localEnv = env.dup(tree);
3039 //should we propagate the target type?
3040 final ResultInfo castInfo;
3041 JCExpression expr = TreeInfo.skipParens(tree.expr);
3042 boolean isPoly = expr.hasTag(LAMBDA) || expr.hasTag(REFERENCE);
3043 if (isPoly) {
3044 //expression is a poly - we need to propagate target type info
3045 castInfo = new ResultInfo(VAL, clazztype, new Check.NestedCheckContext(resultInfo.checkContext) {
3046 @Override
3047 public boolean compatible(Type found, Type req, Warner warn) {
3048 return types.isCastable(found, req, warn);
3049 }
3050 });
3051 } else {
3052 //standalone cast - target-type info is not propagated
3053 castInfo = unknownExprInfo;
3054 }
3055 Type exprtype = attribTree(tree.expr, localEnv, castInfo);
3056 Type owntype = isPoly ? clazztype : chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3057 if (exprtype.constValue() != null)
3058 owntype = cfolder.coerce(exprtype, owntype);
3059 result = check(tree, capture(owntype), VAL, resultInfo);
3060 if (!isPoly)
3061 chk.checkRedundantCast(localEnv, tree);
3062 }
3064 public void visitTypeTest(JCInstanceOf tree) {
3065 Type exprtype = chk.checkNullOrRefType(
3066 tree.expr.pos(), attribExpr(tree.expr, env));
3067 Type clazztype = chk.checkReifiableReferenceType(
3068 tree.clazz.pos(), attribType(tree.clazz, env));
3069 chk.validate(tree.clazz, env, false);
3070 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
3071 result = check(tree, syms.booleanType, VAL, resultInfo);
3072 }
3074 public void visitIndexed(JCArrayAccess tree) {
3075 Type owntype = types.createErrorType(tree.type);
3076 Type atype = attribExpr(tree.indexed, env);
3077 attribExpr(tree.index, env, syms.intType);
3078 if (types.isArray(atype))
3079 owntype = types.elemtype(atype);
3080 else if (!atype.hasTag(ERROR))
3081 log.error(tree.pos(), "array.req.but.found", atype);
3082 if ((pkind() & VAR) == 0) owntype = capture(owntype);
3083 result = check(tree, owntype, VAR, resultInfo);
3084 }
3086 public void visitIdent(JCIdent tree) {
3087 Symbol sym;
3089 // Find symbol
3090 if (pt().hasTag(METHOD) || pt().hasTag(FORALL)) {
3091 // If we are looking for a method, the prototype `pt' will be a
3092 // method type with the type of the call's arguments as parameters.
3093 env.info.pendingResolutionPhase = null;
3094 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt().getParameterTypes(), pt().getTypeArguments());
3095 } else if (tree.sym != null && tree.sym.kind != VAR) {
3096 sym = tree.sym;
3097 } else {
3098 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind());
3099 }
3100 tree.sym = sym;
3102 // (1) Also find the environment current for the class where
3103 // sym is defined (`symEnv').
3104 // Only for pre-tiger versions (1.4 and earlier):
3105 // (2) Also determine whether we access symbol out of an anonymous
3106 // class in a this or super call. This is illegal for instance
3107 // members since such classes don't carry a this$n link.
3108 // (`noOuterThisPath').
3109 Env<AttrContext> symEnv = env;
3110 boolean noOuterThisPath = false;
3111 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
3112 (sym.kind & (VAR | MTH | TYP)) != 0 &&
3113 sym.owner.kind == TYP &&
3114 tree.name != names._this && tree.name != names._super) {
3116 // Find environment in which identifier is defined.
3117 while (symEnv.outer != null &&
3118 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
3119 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
3120 noOuterThisPath = !allowAnonOuterThis;
3121 symEnv = symEnv.outer;
3122 }
3123 }
3125 // If symbol is a variable, ...
3126 if (sym.kind == VAR) {
3127 VarSymbol v = (VarSymbol)sym;
3129 // ..., evaluate its initializer, if it has one, and check for
3130 // illegal forward reference.
3131 checkInit(tree, env, v, false);
3133 // If we are expecting a variable (as opposed to a value), check
3134 // that the variable is assignable in the current environment.
3135 if (pkind() == VAR)
3136 checkAssignable(tree.pos(), v, null, env);
3137 }
3139 // In a constructor body,
3140 // if symbol is a field or instance method, check that it is
3141 // not accessed before the supertype constructor is called.
3142 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
3143 (sym.kind & (VAR | MTH)) != 0 &&
3144 sym.owner.kind == TYP &&
3145 (sym.flags() & STATIC) == 0) {
3146 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
3147 }
3148 Env<AttrContext> env1 = env;
3149 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
3150 // If the found symbol is inaccessible, then it is
3151 // accessed through an enclosing instance. Locate this
3152 // enclosing instance:
3153 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
3154 env1 = env1.outer;
3155 }
3156 result = checkId(tree, env1.enclClass.sym.type, sym, env, resultInfo);
3157 }
3159 public void visitSelect(JCFieldAccess tree) {
3160 // Determine the expected kind of the qualifier expression.
3161 int skind = 0;
3162 if (tree.name == names._this || tree.name == names._super ||
3163 tree.name == names._class)
3164 {
3165 skind = TYP;
3166 } else {
3167 if ((pkind() & PCK) != 0) skind = skind | PCK;
3168 if ((pkind() & TYP) != 0) skind = skind | TYP | PCK;
3169 if ((pkind() & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
3170 }
3172 // Attribute the qualifier expression, and determine its symbol (if any).
3173 Type site = attribTree(tree.selected, env, new ResultInfo(skind, Infer.anyPoly));
3174 if ((pkind() & (PCK | TYP)) == 0)
3175 site = capture(site); // Capture field access
3177 // don't allow T.class T[].class, etc
3178 if (skind == TYP) {
3179 Type elt = site;
3180 while (elt.hasTag(ARRAY))
3181 elt = ((ArrayType)elt).elemtype;
3182 if (elt.hasTag(TYPEVAR)) {
3183 log.error(tree.pos(), "type.var.cant.be.deref");
3184 result = types.createErrorType(tree.type);
3185 return;
3186 }
3187 }
3189 // If qualifier symbol is a type or `super', assert `selectSuper'
3190 // for the selection. This is relevant for determining whether
3191 // protected symbols are accessible.
3192 Symbol sitesym = TreeInfo.symbol(tree.selected);
3193 boolean selectSuperPrev = env.info.selectSuper;
3194 env.info.selectSuper =
3195 sitesym != null &&
3196 sitesym.name == names._super;
3198 // Determine the symbol represented by the selection.
3199 env.info.pendingResolutionPhase = null;
3200 Symbol sym = selectSym(tree, sitesym, site, env, resultInfo);
3201 if (sym.exists() && !isType(sym) && (pkind() & (PCK | TYP)) != 0) {
3202 site = capture(site);
3203 sym = selectSym(tree, sitesym, site, env, resultInfo);
3204 }
3205 boolean varArgs = env.info.lastResolveVarargs();
3206 tree.sym = sym;
3208 if (site.hasTag(TYPEVAR) && !isType(sym) && sym.kind != ERR) {
3209 while (site.hasTag(TYPEVAR)) site = site.getUpperBound();
3210 site = capture(site);
3211 }
3213 // If that symbol is a variable, ...
3214 if (sym.kind == VAR) {
3215 VarSymbol v = (VarSymbol)sym;
3217 // ..., evaluate its initializer, if it has one, and check for
3218 // illegal forward reference.
3219 checkInit(tree, env, v, true);
3221 // If we are expecting a variable (as opposed to a value), check
3222 // that the variable is assignable in the current environment.
3223 if (pkind() == VAR)
3224 checkAssignable(tree.pos(), v, tree.selected, env);
3225 }
3227 if (sitesym != null &&
3228 sitesym.kind == VAR &&
3229 ((VarSymbol)sitesym).isResourceVariable() &&
3230 sym.kind == MTH &&
3231 sym.name.equals(names.close) &&
3232 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
3233 env.info.lint.isEnabled(LintCategory.TRY)) {
3234 log.warning(LintCategory.TRY, tree, "try.explicit.close.call");
3235 }
3237 // Disallow selecting a type from an expression
3238 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
3239 tree.type = check(tree.selected, pt(),
3240 sitesym == null ? VAL : sitesym.kind, new ResultInfo(TYP|PCK, pt()));
3241 }
3243 if (isType(sitesym)) {
3244 if (sym.name == names._this) {
3245 // If `C' is the currently compiled class, check that
3246 // C.this' does not appear in a call to a super(...)
3247 if (env.info.isSelfCall &&
3248 site.tsym == env.enclClass.sym) {
3249 chk.earlyRefError(tree.pos(), sym);
3250 }
3251 } else {
3252 // Check if type-qualified fields or methods are static (JLS)
3253 if ((sym.flags() & STATIC) == 0 &&
3254 !env.next.tree.hasTag(REFERENCE) &&
3255 sym.name != names._super &&
3256 (sym.kind == VAR || sym.kind == MTH)) {
3257 rs.accessBase(rs.new StaticError(sym),
3258 tree.pos(), site, sym.name, true);
3259 }
3260 }
3261 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
3262 // If the qualified item is not a type and the selected item is static, report
3263 // a warning. Make allowance for the class of an array type e.g. Object[].class)
3264 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
3265 }
3267 // If we are selecting an instance member via a `super', ...
3268 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
3270 // Check that super-qualified symbols are not abstract (JLS)
3271 rs.checkNonAbstract(tree.pos(), sym);
3273 if (site.isRaw()) {
3274 // Determine argument types for site.
3275 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
3276 if (site1 != null) site = site1;
3277 }
3278 }
3280 env.info.selectSuper = selectSuperPrev;
3281 result = checkId(tree, site, sym, env, resultInfo);
3282 }
3283 //where
3284 /** Determine symbol referenced by a Select expression,
3285 *
3286 * @param tree The select tree.
3287 * @param site The type of the selected expression,
3288 * @param env The current environment.
3289 * @param resultInfo The current result.
3290 */
3291 private Symbol selectSym(JCFieldAccess tree,
3292 Symbol location,
3293 Type site,
3294 Env<AttrContext> env,
3295 ResultInfo resultInfo) {
3296 DiagnosticPosition pos = tree.pos();
3297 Name name = tree.name;
3298 switch (site.getTag()) {
3299 case PACKAGE:
3300 return rs.accessBase(
3301 rs.findIdentInPackage(env, site.tsym, name, resultInfo.pkind),
3302 pos, location, site, name, true);
3303 case ARRAY:
3304 case CLASS:
3305 if (resultInfo.pt.hasTag(METHOD) || resultInfo.pt.hasTag(FORALL)) {
3306 return rs.resolveQualifiedMethod(
3307 pos, env, location, site, name, resultInfo.pt.getParameterTypes(), resultInfo.pt.getTypeArguments());
3308 } else if (name == names._this || name == names._super) {
3309 return rs.resolveSelf(pos, env, site.tsym, name);
3310 } else if (name == names._class) {
3311 // In this case, we have already made sure in
3312 // visitSelect that qualifier expression is a type.
3313 Type t = syms.classType;
3314 List<Type> typeargs = allowGenerics
3315 ? List.of(types.erasure(site))
3316 : List.<Type>nil();
3317 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
3318 return new VarSymbol(
3319 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3320 } else {
3321 // We are seeing a plain identifier as selector.
3322 Symbol sym = rs.findIdentInType(env, site, name, resultInfo.pkind);
3323 if ((resultInfo.pkind & ERRONEOUS) == 0)
3324 sym = rs.accessBase(sym, pos, location, site, name, true);
3325 return sym;
3326 }
3327 case WILDCARD:
3328 throw new AssertionError(tree);
3329 case TYPEVAR:
3330 // Normally, site.getUpperBound() shouldn't be null.
3331 // It should only happen during memberEnter/attribBase
3332 // when determining the super type which *must* beac
3333 // done before attributing the type variables. In
3334 // other words, we are seeing this illegal program:
3335 // class B<T> extends A<T.foo> {}
3336 Symbol sym = (site.getUpperBound() != null)
3337 ? selectSym(tree, location, capture(site.getUpperBound()), env, resultInfo)
3338 : null;
3339 if (sym == null) {
3340 log.error(pos, "type.var.cant.be.deref");
3341 return syms.errSymbol;
3342 } else {
3343 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
3344 rs.new AccessError(env, site, sym) :
3345 sym;
3346 rs.accessBase(sym2, pos, location, site, name, true);
3347 return sym;
3348 }
3349 case ERROR:
3350 // preserve identifier names through errors
3351 return types.createErrorType(name, site.tsym, site).tsym;
3352 default:
3353 // The qualifier expression is of a primitive type -- only
3354 // .class is allowed for these.
3355 if (name == names._class) {
3356 // In this case, we have already made sure in Select that
3357 // qualifier expression is a type.
3358 Type t = syms.classType;
3359 Type arg = types.boxedClass(site).type;
3360 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
3361 return new VarSymbol(
3362 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
3363 } else {
3364 log.error(pos, "cant.deref", site);
3365 return syms.errSymbol;
3366 }
3367 }
3368 }
3370 /** Determine type of identifier or select expression and check that
3371 * (1) the referenced symbol is not deprecated
3372 * (2) the symbol's type is safe (@see checkSafe)
3373 * (3) if symbol is a variable, check that its type and kind are
3374 * compatible with the prototype and protokind.
3375 * (4) if symbol is an instance field of a raw type,
3376 * which is being assigned to, issue an unchecked warning if its
3377 * type changes under erasure.
3378 * (5) if symbol is an instance method of a raw type, issue an
3379 * unchecked warning if its argument types change under erasure.
3380 * If checks succeed:
3381 * If symbol is a constant, return its constant type
3382 * else if symbol is a method, return its result type
3383 * otherwise return its type.
3384 * Otherwise return errType.
3385 *
3386 * @param tree The syntax tree representing the identifier
3387 * @param site If this is a select, the type of the selected
3388 * expression, otherwise the type of the current class.
3389 * @param sym The symbol representing the identifier.
3390 * @param env The current environment.
3391 * @param resultInfo The expected result
3392 */
3393 Type checkId(JCTree tree,
3394 Type site,
3395 Symbol sym,
3396 Env<AttrContext> env,
3397 ResultInfo resultInfo) {
3398 return (resultInfo.pt.hasTag(FORALL) || resultInfo.pt.hasTag(METHOD)) ?
3399 checkMethodId(tree, site, sym, env, resultInfo) :
3400 checkIdInternal(tree, site, sym, resultInfo.pt, env, resultInfo);
3401 }
3403 Type checkMethodId(JCTree tree,
3404 Type site,
3405 Symbol sym,
3406 Env<AttrContext> env,
3407 ResultInfo resultInfo) {
3408 boolean isPolymorhicSignature =
3409 sym.kind == MTH && ((MethodSymbol)sym.baseSymbol()).isSignaturePolymorphic(types);
3410 return isPolymorhicSignature ?
3411 checkSigPolyMethodId(tree, site, sym, env, resultInfo) :
3412 checkMethodIdInternal(tree, site, sym, env, resultInfo);
3413 }
3415 Type checkSigPolyMethodId(JCTree tree,
3416 Type site,
3417 Symbol sym,
3418 Env<AttrContext> env,
3419 ResultInfo resultInfo) {
3420 //recover original symbol for signature polymorphic methods
3421 checkMethodIdInternal(tree, site, sym.baseSymbol(), env, resultInfo);
3422 env.info.pendingResolutionPhase = Resolve.MethodResolutionPhase.BASIC;
3423 return sym.type;
3424 }
3426 Type checkMethodIdInternal(JCTree tree,
3427 Type site,
3428 Symbol sym,
3429 Env<AttrContext> env,
3430 ResultInfo resultInfo) {
3431 Type pt = resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, sym, env.info.pendingResolutionPhase));
3432 Type owntype = checkIdInternal(tree, site, sym, pt, env, resultInfo);
3433 resultInfo.pt.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.CHECK, sym, env.info.pendingResolutionPhase));
3434 return owntype;
3435 }
3437 Type checkIdInternal(JCTree tree,
3438 Type site,
3439 Symbol sym,
3440 Type pt,
3441 Env<AttrContext> env,
3442 ResultInfo resultInfo) {
3443 if (pt.isErroneous()) {
3444 return types.createErrorType(site);
3445 }
3446 Type owntype; // The computed type of this identifier occurrence.
3447 switch (sym.kind) {
3448 case TYP:
3449 // For types, the computed type equals the symbol's type,
3450 // except for two situations:
3451 owntype = sym.type;
3452 if (owntype.hasTag(CLASS)) {
3453 chk.checkForBadAuxiliaryClassAccess(tree.pos(), env, (ClassSymbol)sym);
3454 Type ownOuter = owntype.getEnclosingType();
3456 // (a) If the symbol's type is parameterized, erase it
3457 // because no type parameters were given.
3458 // We recover generic outer type later in visitTypeApply.
3459 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
3460 owntype = types.erasure(owntype);
3461 }
3463 // (b) If the symbol's type is an inner class, then
3464 // we have to interpret its outer type as a superclass
3465 // of the site type. Example:
3466 //
3467 // class Tree<A> { class Visitor { ... } }
3468 // class PointTree extends Tree<Point> { ... }
3469 // ...PointTree.Visitor...
3470 //
3471 // Then the type of the last expression above is
3472 // Tree<Point>.Visitor.
3473 else if (ownOuter.hasTag(CLASS) && site != ownOuter) {
3474 Type normOuter = site;
3475 if (normOuter.hasTag(CLASS)) {
3476 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
3477 if (site.isAnnotated()) {
3478 // Propagate any type annotations.
3479 // TODO: should asEnclosingSuper do this?
3480 // Note that the type annotations in site will be updated
3481 // by annotateType. Therefore, modify site instead
3482 // of creating a new AnnotatedType.
3483 ((AnnotatedType)site).underlyingType = normOuter;
3484 normOuter = site;
3485 }
3486 }
3487 if (normOuter == null) // perhaps from an import
3488 normOuter = types.erasure(ownOuter);
3489 if (normOuter != ownOuter)
3490 owntype = new ClassType(
3491 normOuter, List.<Type>nil(), owntype.tsym);
3492 }
3493 }
3494 break;
3495 case VAR:
3496 VarSymbol v = (VarSymbol)sym;
3497 // Test (4): if symbol is an instance field of a raw type,
3498 // which is being assigned to, issue an unchecked warning if
3499 // its type changes under erasure.
3500 if (allowGenerics &&
3501 resultInfo.pkind == VAR &&
3502 v.owner.kind == TYP &&
3503 (v.flags() & STATIC) == 0 &&
3504 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3505 Type s = types.asOuterSuper(site, v.owner);
3506 if (s != null &&
3507 s.isRaw() &&
3508 !types.isSameType(v.type, v.erasure(types))) {
3509 chk.warnUnchecked(tree.pos(),
3510 "unchecked.assign.to.var",
3511 v, s);
3512 }
3513 }
3514 // The computed type of a variable is the type of the
3515 // variable symbol, taken as a member of the site type.
3516 owntype = (sym.owner.kind == TYP &&
3517 sym.name != names._this && sym.name != names._super)
3518 ? types.memberType(site, sym)
3519 : sym.type;
3521 // If the variable is a constant, record constant value in
3522 // computed type.
3523 if (v.getConstValue() != null && isStaticReference(tree))
3524 owntype = owntype.constType(v.getConstValue());
3526 if (resultInfo.pkind == VAL) {
3527 owntype = capture(owntype); // capture "names as expressions"
3528 }
3529 break;
3530 case MTH: {
3531 owntype = checkMethod(site, sym,
3532 new ResultInfo(VAL, resultInfo.pt.getReturnType(), resultInfo.checkContext),
3533 env, TreeInfo.args(env.tree), resultInfo.pt.getParameterTypes(),
3534 resultInfo.pt.getTypeArguments());
3535 break;
3536 }
3537 case PCK: case ERR:
3538 owntype = sym.type;
3539 break;
3540 default:
3541 throw new AssertionError("unexpected kind: " + sym.kind +
3542 " in tree " + tree);
3543 }
3545 // Test (1): emit a `deprecation' warning if symbol is deprecated.
3546 // (for constructors, the error was given when the constructor was
3547 // resolved)
3549 if (sym.name != names.init) {
3550 chk.checkDeprecated(tree.pos(), env.info.scope.owner, sym);
3551 chk.checkSunAPI(tree.pos(), sym);
3552 chk.checkProfile(tree.pos(), sym);
3553 }
3555 // Test (3): if symbol is a variable, check that its type and
3556 // kind are compatible with the prototype and protokind.
3557 return check(tree, owntype, sym.kind, resultInfo);
3558 }
3560 /** Check that variable is initialized and evaluate the variable's
3561 * initializer, if not yet done. Also check that variable is not
3562 * referenced before it is defined.
3563 * @param tree The tree making up the variable reference.
3564 * @param env The current environment.
3565 * @param v The variable's symbol.
3566 */
3567 private void checkInit(JCTree tree,
3568 Env<AttrContext> env,
3569 VarSymbol v,
3570 boolean onlyWarning) {
3571 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
3572 // tree.pos + " " + v.pos + " " +
3573 // Resolve.isStatic(env));//DEBUG
3575 // A forward reference is diagnosed if the declaration position
3576 // of the variable is greater than the current tree position
3577 // and the tree and variable definition occur in the same class
3578 // definition. Note that writes don't count as references.
3579 // This check applies only to class and instance
3580 // variables. Local variables follow different scope rules,
3581 // and are subject to definite assignment checking.
3582 if ((env.info.enclVar == v || v.pos > tree.pos) &&
3583 v.owner.kind == TYP &&
3584 canOwnInitializer(owner(env)) &&
3585 v.owner == env.info.scope.owner.enclClass() &&
3586 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
3587 (!env.tree.hasTag(ASSIGN) ||
3588 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
3589 String suffix = (env.info.enclVar == v) ?
3590 "self.ref" : "forward.ref";
3591 if (!onlyWarning || isStaticEnumField(v)) {
3592 log.error(tree.pos(), "illegal." + suffix);
3593 } else if (useBeforeDeclarationWarning) {
3594 log.warning(tree.pos(), suffix, v);
3595 }
3596 }
3598 v.getConstValue(); // ensure initializer is evaluated
3600 checkEnumInitializer(tree, env, v);
3601 }
3603 /**
3604 * Check for illegal references to static members of enum. In
3605 * an enum type, constructors and initializers may not
3606 * reference its static members unless they are constant.
3607 *
3608 * @param tree The tree making up the variable reference.
3609 * @param env The current environment.
3610 * @param v The variable's symbol.
3611 * @jls section 8.9 Enums
3612 */
3613 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
3614 // JLS:
3615 //
3616 // "It is a compile-time error to reference a static field
3617 // of an enum type that is not a compile-time constant
3618 // (15.28) from constructors, instance initializer blocks,
3619 // or instance variable initializer expressions of that
3620 // type. It is a compile-time error for the constructors,
3621 // instance initializer blocks, or instance variable
3622 // initializer expressions of an enum constant e to refer
3623 // to itself or to an enum constant of the same type that
3624 // is declared to the right of e."
3625 if (isStaticEnumField(v)) {
3626 ClassSymbol enclClass = env.info.scope.owner.enclClass();
3628 if (enclClass == null || enclClass.owner == null)
3629 return;
3631 // See if the enclosing class is the enum (or a
3632 // subclass thereof) declaring v. If not, this
3633 // reference is OK.
3634 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
3635 return;
3637 // If the reference isn't from an initializer, then
3638 // the reference is OK.
3639 if (!Resolve.isInitializer(env))
3640 return;
3642 log.error(tree.pos(), "illegal.enum.static.ref");
3643 }
3644 }
3646 /** Is the given symbol a static, non-constant field of an Enum?
3647 * Note: enum literals should not be regarded as such
3648 */
3649 private boolean isStaticEnumField(VarSymbol v) {
3650 return Flags.isEnum(v.owner) &&
3651 Flags.isStatic(v) &&
3652 !Flags.isConstant(v) &&
3653 v.name != names._class;
3654 }
3656 /** Can the given symbol be the owner of code which forms part
3657 * if class initialization? This is the case if the symbol is
3658 * a type or field, or if the symbol is the synthetic method.
3659 * owning a block.
3660 */
3661 private boolean canOwnInitializer(Symbol sym) {
3662 return
3663 (sym.kind & (VAR | TYP)) != 0 ||
3664 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
3665 }
3667 Warner noteWarner = new Warner();
3669 /**
3670 * Check that method arguments conform to its instantiation.
3671 **/
3672 public Type checkMethod(Type site,
3673 Symbol sym,
3674 ResultInfo resultInfo,
3675 Env<AttrContext> env,
3676 final List<JCExpression> argtrees,
3677 List<Type> argtypes,
3678 List<Type> typeargtypes) {
3679 // Test (5): if symbol is an instance method of a raw type, issue
3680 // an unchecked warning if its argument types change under erasure.
3681 if (allowGenerics &&
3682 (sym.flags() & STATIC) == 0 &&
3683 (site.hasTag(CLASS) || site.hasTag(TYPEVAR))) {
3684 Type s = types.asOuterSuper(site, sym.owner);
3685 if (s != null && s.isRaw() &&
3686 !types.isSameTypes(sym.type.getParameterTypes(),
3687 sym.erasure(types).getParameterTypes())) {
3688 chk.warnUnchecked(env.tree.pos(),
3689 "unchecked.call.mbr.of.raw.type",
3690 sym, s);
3691 }
3692 }
3694 if (env.info.defaultSuperCallSite != null) {
3695 for (Type sup : types.interfaces(env.enclClass.type).prepend(types.supertype((env.enclClass.type)))) {
3696 if (!sup.tsym.isSubClass(sym.enclClass(), types) ||
3697 types.isSameType(sup, env.info.defaultSuperCallSite)) continue;
3698 List<MethodSymbol> icand_sup =
3699 types.interfaceCandidates(sup, (MethodSymbol)sym);
3700 if (icand_sup.nonEmpty() &&
3701 icand_sup.head != sym &&
3702 icand_sup.head.overrides(sym, icand_sup.head.enclClass(), types, true)) {
3703 log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
3704 diags.fragment("overridden.default", sym, sup));
3705 break;
3706 }
3707 }
3708 env.info.defaultSuperCallSite = null;
3709 }
3711 if (sym.isStatic() && site.isInterface() && env.tree.hasTag(APPLY)) {
3712 JCMethodInvocation app = (JCMethodInvocation)env.tree;
3713 if (app.meth.hasTag(SELECT) &&
3714 !TreeInfo.isStaticSelector(((JCFieldAccess)app.meth).selected, names)) {
3715 log.error(env.tree.pos(), "illegal.static.intf.meth.call", site);
3716 }
3717 }
3719 // Compute the identifier's instantiated type.
3720 // For methods, we need to compute the instance type by
3721 // Resolve.instantiate from the symbol's type as well as
3722 // any type arguments and value arguments.
3723 noteWarner.clear();
3724 try {
3725 Type owntype = rs.checkMethod(
3726 env,
3727 site,
3728 sym,
3729 resultInfo,
3730 argtypes,
3731 typeargtypes,
3732 noteWarner);
3734 return chk.checkMethod(owntype, sym, env, argtrees, argtypes, env.info.lastResolveVarargs(),
3735 noteWarner.hasNonSilentLint(LintCategory.UNCHECKED), resultInfo.checkContext.inferenceContext());
3736 } catch (Infer.InferenceException ex) {
3737 //invalid target type - propagate exception outwards or report error
3738 //depending on the current check context
3739 resultInfo.checkContext.report(env.tree.pos(), ex.getDiagnostic());
3740 return types.createErrorType(site);
3741 } catch (Resolve.InapplicableMethodException ex) {
3742 Assert.error(ex.getDiagnostic().getMessage(Locale.getDefault()));
3743 return null;
3744 }
3745 }
3747 public void visitLiteral(JCLiteral tree) {
3748 result = check(
3749 tree, litType(tree.typetag).constType(tree.value), VAL, resultInfo);
3750 }
3751 //where
3752 /** Return the type of a literal with given type tag.
3753 */
3754 Type litType(TypeTag tag) {
3755 return (tag == CLASS) ? syms.stringType : syms.typeOfTag[tag.ordinal()];
3756 }
3758 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
3759 result = check(tree, syms.typeOfTag[tree.typetag.ordinal()], TYP, resultInfo);
3760 }
3762 public void visitTypeArray(JCArrayTypeTree tree) {
3763 Type etype = attribType(tree.elemtype, env);
3764 Type type = new ArrayType(etype, syms.arrayClass);
3765 result = check(tree, type, TYP, resultInfo);
3766 }
3768 /** Visitor method for parameterized types.
3769 * Bound checking is left until later, since types are attributed
3770 * before supertype structure is completely known
3771 */
3772 public void visitTypeApply(JCTypeApply tree) {
3773 Type owntype = types.createErrorType(tree.type);
3775 // Attribute functor part of application and make sure it's a class.
3776 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
3778 // Attribute type parameters
3779 List<Type> actuals = attribTypes(tree.arguments, env);
3781 if (clazztype.hasTag(CLASS)) {
3782 List<Type> formals = clazztype.tsym.type.getTypeArguments();
3783 if (actuals.isEmpty()) //diamond
3784 actuals = formals;
3786 if (actuals.length() == formals.length()) {
3787 List<Type> a = actuals;
3788 List<Type> f = formals;
3789 while (a.nonEmpty()) {
3790 a.head = a.head.withTypeVar(f.head);
3791 a = a.tail;
3792 f = f.tail;
3793 }
3794 // Compute the proper generic outer
3795 Type clazzOuter = clazztype.getEnclosingType();
3796 if (clazzOuter.hasTag(CLASS)) {
3797 Type site;
3798 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
3799 if (clazz.hasTag(IDENT)) {
3800 site = env.enclClass.sym.type;
3801 } else if (clazz.hasTag(SELECT)) {
3802 site = ((JCFieldAccess) clazz).selected.type;
3803 } else throw new AssertionError(""+tree);
3804 if (clazzOuter.hasTag(CLASS) && site != clazzOuter) {
3805 if (site.hasTag(CLASS))
3806 site = types.asOuterSuper(site, clazzOuter.tsym);
3807 if (site == null)
3808 site = types.erasure(clazzOuter);
3809 clazzOuter = site;
3810 }
3811 }
3812 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
3813 if (clazztype.isAnnotated()) {
3814 // Use the same AnnotatedType, because it will have
3815 // its annotations set later.
3816 ((AnnotatedType)clazztype).underlyingType = owntype;
3817 owntype = clazztype;
3818 }
3819 } else {
3820 if (formals.length() != 0) {
3821 log.error(tree.pos(), "wrong.number.type.args",
3822 Integer.toString(formals.length()));
3823 } else {
3824 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
3825 }
3826 owntype = types.createErrorType(tree.type);
3827 }
3828 }
3829 result = check(tree, owntype, TYP, resultInfo);
3830 }
3832 public void visitTypeUnion(JCTypeUnion tree) {
3833 ListBuffer<Type> multicatchTypes = ListBuffer.lb();
3834 ListBuffer<Type> all_multicatchTypes = null; // lazy, only if needed
3835 for (JCExpression typeTree : tree.alternatives) {
3836 Type ctype = attribType(typeTree, env);
3837 ctype = chk.checkType(typeTree.pos(),
3838 chk.checkClassType(typeTree.pos(), ctype),
3839 syms.throwableType);
3840 if (!ctype.isErroneous()) {
3841 //check that alternatives of a union type are pairwise
3842 //unrelated w.r.t. subtyping
3843 if (chk.intersects(ctype, multicatchTypes.toList())) {
3844 for (Type t : multicatchTypes) {
3845 boolean sub = types.isSubtype(ctype, t);
3846 boolean sup = types.isSubtype(t, ctype);
3847 if (sub || sup) {
3848 //assume 'a' <: 'b'
3849 Type a = sub ? ctype : t;
3850 Type b = sub ? t : ctype;
3851 log.error(typeTree.pos(), "multicatch.types.must.be.disjoint", a, b);
3852 }
3853 }
3854 }
3855 multicatchTypes.append(ctype);
3856 if (all_multicatchTypes != null)
3857 all_multicatchTypes.append(ctype);
3858 } else {
3859 if (all_multicatchTypes == null) {
3860 all_multicatchTypes = ListBuffer.lb();
3861 all_multicatchTypes.appendList(multicatchTypes);
3862 }
3863 all_multicatchTypes.append(ctype);
3864 }
3865 }
3866 Type t = check(tree, types.lub(multicatchTypes.toList()), TYP, resultInfo);
3867 if (t.hasTag(CLASS)) {
3868 List<Type> alternatives =
3869 ((all_multicatchTypes == null) ? multicatchTypes : all_multicatchTypes).toList();
3870 t = new UnionClassType((ClassType) t, alternatives);
3871 }
3872 tree.type = result = t;
3873 }
3875 public void visitTypeIntersection(JCTypeIntersection tree) {
3876 attribTypes(tree.bounds, env);
3877 tree.type = result = checkIntersection(tree, tree.bounds);
3878 }
3880 public void visitTypeParameter(JCTypeParameter tree) {
3881 TypeVar typeVar = (TypeVar) tree.type;
3883 if (tree.annotations != null && tree.annotations.nonEmpty()) {
3884 AnnotatedType antype = new AnnotatedType(typeVar);
3885 annotateType(antype, tree.annotations);
3886 tree.type = antype;
3887 }
3889 if (!typeVar.bound.isErroneous()) {
3890 //fixup type-parameter bound computed in 'attribTypeVariables'
3891 typeVar.bound = checkIntersection(tree, tree.bounds);
3892 }
3893 }
3895 Type checkIntersection(JCTree tree, List<JCExpression> bounds) {
3896 Set<Type> boundSet = new HashSet<Type>();
3897 if (bounds.nonEmpty()) {
3898 // accept class or interface or typevar as first bound.
3899 bounds.head.type = checkBase(bounds.head.type, bounds.head, env, false, false, false);
3900 boundSet.add(types.erasure(bounds.head.type));
3901 if (bounds.head.type.isErroneous()) {
3902 return bounds.head.type;
3903 }
3904 else if (bounds.head.type.hasTag(TYPEVAR)) {
3905 // if first bound was a typevar, do not accept further bounds.
3906 if (bounds.tail.nonEmpty()) {
3907 log.error(bounds.tail.head.pos(),
3908 "type.var.may.not.be.followed.by.other.bounds");
3909 return bounds.head.type;
3910 }
3911 } else {
3912 // if first bound was a class or interface, accept only interfaces
3913 // as further bounds.
3914 for (JCExpression bound : bounds.tail) {
3915 bound.type = checkBase(bound.type, bound, env, false, true, false);
3916 if (bound.type.isErroneous()) {
3917 bounds = List.of(bound);
3918 }
3919 else if (bound.type.hasTag(CLASS)) {
3920 chk.checkNotRepeated(bound.pos(), types.erasure(bound.type), boundSet);
3921 }
3922 }
3923 }
3924 }
3926 if (bounds.length() == 0) {
3927 return syms.objectType;
3928 } else if (bounds.length() == 1) {
3929 return bounds.head.type;
3930 } else {
3931 Type owntype = types.makeCompoundType(TreeInfo.types(bounds));
3932 if (tree.hasTag(TYPEINTERSECTION)) {
3933 ((IntersectionClassType)owntype).intersectionKind =
3934 IntersectionClassType.IntersectionKind.EXPLICIT;
3935 }
3936 // ... the variable's bound is a class type flagged COMPOUND
3937 // (see comment for TypeVar.bound).
3938 // In this case, generate a class tree that represents the
3939 // bound class, ...
3940 JCExpression extending;
3941 List<JCExpression> implementing;
3942 if (!bounds.head.type.isInterface()) {
3943 extending = bounds.head;
3944 implementing = bounds.tail;
3945 } else {
3946 extending = null;
3947 implementing = bounds;
3948 }
3949 JCClassDecl cd = make.at(tree).ClassDef(
3950 make.Modifiers(PUBLIC | ABSTRACT),
3951 names.empty, List.<JCTypeParameter>nil(),
3952 extending, implementing, List.<JCTree>nil());
3954 ClassSymbol c = (ClassSymbol)owntype.tsym;
3955 Assert.check((c.flags() & COMPOUND) != 0);
3956 cd.sym = c;
3957 c.sourcefile = env.toplevel.sourcefile;
3959 // ... and attribute the bound class
3960 c.flags_field |= UNATTRIBUTED;
3961 Env<AttrContext> cenv = enter.classEnv(cd, env);
3962 enter.typeEnvs.put(c, cenv);
3963 attribClass(c);
3964 return owntype;
3965 }
3966 }
3968 public void visitWildcard(JCWildcard tree) {
3969 //- System.err.println("visitWildcard("+tree+");");//DEBUG
3970 Type type = (tree.kind.kind == BoundKind.UNBOUND)
3971 ? syms.objectType
3972 : attribType(tree.inner, env);
3973 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
3974 tree.kind.kind,
3975 syms.boundClass),
3976 TYP, resultInfo);
3977 }
3979 public void visitAnnotation(JCAnnotation tree) {
3980 log.error(tree.pos(), "annotation.not.valid.for.type", pt());
3981 result = tree.type = syms.errType;
3982 }
3984 public void visitAnnotatedType(JCAnnotatedType tree) {
3985 Type underlyingType = attribType(tree.getUnderlyingType(), env);
3986 this.attribAnnotationTypes(tree.annotations, env);
3987 AnnotatedType antype = new AnnotatedType(underlyingType);
3988 annotateType(antype, tree.annotations);
3989 result = tree.type = antype;
3990 }
3992 /**
3993 * Apply the annotations to the particular type.
3994 */
3995 public void annotateType(final AnnotatedType type, final List<JCAnnotation> annotations) {
3996 if (annotations.isEmpty())
3997 return;
3998 annotate.typeAnnotation(new Annotate.Annotator() {
3999 @Override
4000 public String toString() {
4001 return "annotate " + annotations + " onto " + type;
4002 }
4003 @Override
4004 public void enterAnnotation() {
4005 List<Attribute.TypeCompound> compounds = fromAnnotations(annotations);
4006 type.typeAnnotations = compounds;
4007 }
4008 });
4009 }
4011 private static List<Attribute.TypeCompound> fromAnnotations(List<JCAnnotation> annotations) {
4012 if (annotations.isEmpty())
4013 return List.nil();
4015 ListBuffer<Attribute.TypeCompound> buf = ListBuffer.lb();
4016 for (JCAnnotation anno : annotations) {
4017 if (anno.attribute != null) {
4018 // TODO: this null-check is only needed for an obscure
4019 // ordering issue, where annotate.flush is called when
4020 // the attribute is not set yet. For an example failure
4021 // try the referenceinfos/NestedTypes.java test.
4022 // Any better solutions?
4023 buf.append((Attribute.TypeCompound) anno.attribute);
4024 }
4025 }
4026 return buf.toList();
4027 }
4029 public void visitErroneous(JCErroneous tree) {
4030 if (tree.errs != null)
4031 for (JCTree err : tree.errs)
4032 attribTree(err, env, new ResultInfo(ERR, pt()));
4033 result = tree.type = syms.errType;
4034 }
4036 /** Default visitor method for all other trees.
4037 */
4038 public void visitTree(JCTree tree) {
4039 throw new AssertionError();
4040 }
4042 /**
4043 * Attribute an env for either a top level tree or class declaration.
4044 */
4045 public void attrib(Env<AttrContext> env) {
4046 if (env.tree.hasTag(TOPLEVEL))
4047 attribTopLevel(env);
4048 else
4049 attribClass(env.tree.pos(), env.enclClass.sym);
4050 }
4052 /**
4053 * Attribute a top level tree. These trees are encountered when the
4054 * package declaration has annotations.
4055 */
4056 public void attribTopLevel(Env<AttrContext> env) {
4057 JCCompilationUnit toplevel = env.toplevel;
4058 try {
4059 annotate.flush();
4060 chk.validateAnnotations(toplevel.packageAnnotations, toplevel.packge);
4061 } catch (CompletionFailure ex) {
4062 chk.completionError(toplevel.pos(), ex);
4063 }
4064 }
4066 /** Main method: attribute class definition associated with given class symbol.
4067 * reporting completion failures at the given position.
4068 * @param pos The source position at which completion errors are to be
4069 * reported.
4070 * @param c The class symbol whose definition will be attributed.
4071 */
4072 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
4073 try {
4074 annotate.flush();
4075 attribClass(c);
4076 } catch (CompletionFailure ex) {
4077 chk.completionError(pos, ex);
4078 }
4079 }
4081 /** Attribute class definition associated with given class symbol.
4082 * @param c The class symbol whose definition will be attributed.
4083 */
4084 void attribClass(ClassSymbol c) throws CompletionFailure {
4085 if (c.type.hasTag(ERROR)) return;
4087 // Check for cycles in the inheritance graph, which can arise from
4088 // ill-formed class files.
4089 chk.checkNonCyclic(null, c.type);
4091 Type st = types.supertype(c.type);
4092 if ((c.flags_field & Flags.COMPOUND) == 0) {
4093 // First, attribute superclass.
4094 if (st.hasTag(CLASS))
4095 attribClass((ClassSymbol)st.tsym);
4097 // Next attribute owner, if it is a class.
4098 if (c.owner.kind == TYP && c.owner.type.hasTag(CLASS))
4099 attribClass((ClassSymbol)c.owner);
4100 }
4102 // The previous operations might have attributed the current class
4103 // if there was a cycle. So we test first whether the class is still
4104 // UNATTRIBUTED.
4105 if ((c.flags_field & UNATTRIBUTED) != 0) {
4106 c.flags_field &= ~UNATTRIBUTED;
4108 // Get environment current at the point of class definition.
4109 Env<AttrContext> env = enter.typeEnvs.get(c);
4111 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
4112 // because the annotations were not available at the time the env was created. Therefore,
4113 // we look up the environment chain for the first enclosing environment for which the
4114 // lint value is set. Typically, this is the parent env, but might be further if there
4115 // are any envs created as a result of TypeParameter nodes.
4116 Env<AttrContext> lintEnv = env;
4117 while (lintEnv.info.lint == null)
4118 lintEnv = lintEnv.next;
4120 // Having found the enclosing lint value, we can initialize the lint value for this class
4121 env.info.lint = lintEnv.info.lint.augment(c.annotations, c.flags());
4123 Lint prevLint = chk.setLint(env.info.lint);
4124 JavaFileObject prev = log.useSource(c.sourcefile);
4125 ResultInfo prevReturnRes = env.info.returnResult;
4127 try {
4128 env.info.returnResult = null;
4129 // java.lang.Enum may not be subclassed by a non-enum
4130 if (st.tsym == syms.enumSym &&
4131 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
4132 log.error(env.tree.pos(), "enum.no.subclassing");
4134 // Enums may not be extended by source-level classes
4135 if (st.tsym != null &&
4136 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
4137 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0)) {
4138 log.error(env.tree.pos(), "enum.types.not.extensible");
4139 }
4140 attribClassBody(env, c);
4142 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
4143 chk.checkClassOverrideEqualsAndHashIfNeeded(env.tree.pos(), c);
4144 } finally {
4145 env.info.returnResult = prevReturnRes;
4146 log.useSource(prev);
4147 chk.setLint(prevLint);
4148 }
4150 }
4151 }
4153 public void visitImport(JCImport tree) {
4154 // nothing to do
4155 }
4157 /** Finish the attribution of a class. */
4158 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
4159 JCClassDecl tree = (JCClassDecl)env.tree;
4160 Assert.check(c == tree.sym);
4162 // Validate annotations
4163 chk.validateAnnotations(tree.mods.annotations, c);
4165 // Validate type parameters, supertype and interfaces.
4166 attribStats(tree.typarams, env);
4167 if (!c.isAnonymous()) {
4168 //already checked if anonymous
4169 chk.validate(tree.typarams, env);
4170 chk.validate(tree.extending, env);
4171 chk.validate(tree.implementing, env);
4172 }
4174 // If this is a non-abstract class, check that it has no abstract
4175 // methods or unimplemented methods of an implemented interface.
4176 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
4177 if (!relax)
4178 chk.checkAllDefined(tree.pos(), c);
4179 }
4181 if ((c.flags() & ANNOTATION) != 0) {
4182 if (tree.implementing.nonEmpty())
4183 log.error(tree.implementing.head.pos(),
4184 "cant.extend.intf.annotation");
4185 if (tree.typarams.nonEmpty())
4186 log.error(tree.typarams.head.pos(),
4187 "intf.annotation.cant.have.type.params");
4189 // If this annotation has a @Repeatable, validate
4190 Attribute.Compound repeatable = c.attribute(syms.repeatableType.tsym);
4191 if (repeatable != null) {
4192 // get diagnostic position for error reporting
4193 DiagnosticPosition cbPos = getDiagnosticPosition(tree, repeatable.type);
4194 Assert.checkNonNull(cbPos);
4196 chk.validateRepeatable(c, repeatable, cbPos);
4197 }
4198 } else {
4199 // Check that all extended classes and interfaces
4200 // are compatible (i.e. no two define methods with same arguments
4201 // yet different return types). (JLS 8.4.6.3)
4202 chk.checkCompatibleSupertypes(tree.pos(), c.type);
4203 if (allowDefaultMethods) {
4204 chk.checkDefaultMethodClashes(tree.pos(), c.type);
4205 }
4206 }
4208 // Check that class does not import the same parameterized interface
4209 // with two different argument lists.
4210 chk.checkClassBounds(tree.pos(), c.type);
4212 tree.type = c.type;
4214 for (List<JCTypeParameter> l = tree.typarams;
4215 l.nonEmpty(); l = l.tail) {
4216 Assert.checkNonNull(env.info.scope.lookup(l.head.name).scope);
4217 }
4219 // Check that a generic class doesn't extend Throwable
4220 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
4221 log.error(tree.extending.pos(), "generic.throwable");
4223 // Check that all methods which implement some
4224 // method conform to the method they implement.
4225 chk.checkImplementations(tree);
4227 //check that a resource implementing AutoCloseable cannot throw InterruptedException
4228 checkAutoCloseable(tree.pos(), env, c.type);
4230 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
4231 // Attribute declaration
4232 attribStat(l.head, env);
4233 // Check that declarations in inner classes are not static (JLS 8.1.2)
4234 // Make an exception for static constants.
4235 if (c.owner.kind != PCK &&
4236 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
4237 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
4238 Symbol sym = null;
4239 if (l.head.hasTag(VARDEF)) sym = ((JCVariableDecl) l.head).sym;
4240 if (sym == null ||
4241 sym.kind != VAR ||
4242 ((VarSymbol) sym).getConstValue() == null)
4243 log.error(l.head.pos(), "icls.cant.have.static.decl", c);
4244 }
4245 }
4247 // Check for cycles among non-initial constructors.
4248 chk.checkCyclicConstructors(tree);
4250 // Check for cycles among annotation elements.
4251 chk.checkNonCyclicElements(tree);
4253 // Check for proper use of serialVersionUID
4254 if (env.info.lint.isEnabled(LintCategory.SERIAL) &&
4255 isSerializable(c) &&
4256 (c.flags() & Flags.ENUM) == 0 &&
4257 (c.flags() & ABSTRACT) == 0) {
4258 checkSerialVersionUID(tree, c);
4259 }
4261 // Correctly organize the postions of the type annotations
4262 TypeAnnotations.organizeTypeAnnotationsBodies(this.syms, this.names, this.log, tree);
4264 // Check type annotations applicability rules
4265 validateTypeAnnotations(tree);
4266 }
4267 // where
4268 /** get a diagnostic position for an attribute of Type t, or null if attribute missing */
4269 private DiagnosticPosition getDiagnosticPosition(JCClassDecl tree, Type t) {
4270 for(List<JCAnnotation> al = tree.mods.annotations; !al.isEmpty(); al = al.tail) {
4271 if (types.isSameType(al.head.annotationType.type, t))
4272 return al.head.pos();
4273 }
4275 return null;
4276 }
4278 /** check if a class is a subtype of Serializable, if that is available. */
4279 private boolean isSerializable(ClassSymbol c) {
4280 try {
4281 syms.serializableType.complete();
4282 }
4283 catch (CompletionFailure e) {
4284 return false;
4285 }
4286 return types.isSubtype(c.type, syms.serializableType);
4287 }
4289 /** Check that an appropriate serialVersionUID member is defined. */
4290 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
4292 // check for presence of serialVersionUID
4293 Scope.Entry e = c.members().lookup(names.serialVersionUID);
4294 while (e.scope != null && e.sym.kind != VAR) e = e.next();
4295 if (e.scope == null) {
4296 log.warning(LintCategory.SERIAL,
4297 tree.pos(), "missing.SVUID", c);
4298 return;
4299 }
4301 // check that it is static final
4302 VarSymbol svuid = (VarSymbol)e.sym;
4303 if ((svuid.flags() & (STATIC | FINAL)) !=
4304 (STATIC | FINAL))
4305 log.warning(LintCategory.SERIAL,
4306 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
4308 // check that it is long
4309 else if (!svuid.type.hasTag(LONG))
4310 log.warning(LintCategory.SERIAL,
4311 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
4313 // check constant
4314 else if (svuid.getConstValue() == null)
4315 log.warning(LintCategory.SERIAL,
4316 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
4317 }
4319 private Type capture(Type type) {
4320 //do not capture free types
4321 return resultInfo.checkContext.inferenceContext().free(type) ?
4322 type : types.capture(type);
4323 }
4325 private void validateTypeAnnotations(JCTree tree) {
4326 tree.accept(typeAnnotationsValidator);
4327 }
4328 //where
4329 private final JCTree.Visitor typeAnnotationsValidator = new TreeScanner() {
4331 private boolean checkAllAnnotations = false;
4333 public void visitAnnotation(JCAnnotation tree) {
4334 if (tree.hasTag(TYPE_ANNOTATION) || checkAllAnnotations) {
4335 chk.validateTypeAnnotation(tree, false);
4336 }
4337 super.visitAnnotation(tree);
4338 }
4339 public void visitTypeParameter(JCTypeParameter tree) {
4340 chk.validateTypeAnnotations(tree.annotations, true);
4341 scan(tree.bounds);
4342 // Don't call super.
4343 // This is needed because above we call validateTypeAnnotation with
4344 // false, which would forbid annotations on type parameters.
4345 // super.visitTypeParameter(tree);
4346 }
4347 public void visitMethodDef(JCMethodDecl tree) {
4348 if (tree.recvparam != null &&
4349 tree.recvparam.vartype.type.getKind() != TypeKind.ERROR) {
4350 checkForDeclarationAnnotations(tree.recvparam.mods.annotations,
4351 tree.recvparam.vartype.type.tsym);
4352 }
4353 if (tree.restype != null && tree.restype.type != null) {
4354 validateAnnotatedType(tree.restype, tree.restype.type);
4355 }
4356 super.visitMethodDef(tree);
4357 }
4358 public void visitVarDef(final JCVariableDecl tree) {
4359 if (tree.sym != null && tree.sym.type != null)
4360 validateAnnotatedType(tree, tree.sym.type);
4361 super.visitVarDef(tree);
4362 }
4363 public void visitTypeCast(JCTypeCast tree) {
4364 if (tree.clazz != null && tree.clazz.type != null)
4365 validateAnnotatedType(tree.clazz, tree.clazz.type);
4366 super.visitTypeCast(tree);
4367 }
4368 public void visitTypeTest(JCInstanceOf tree) {
4369 if (tree.clazz != null && tree.clazz.type != null)
4370 validateAnnotatedType(tree.clazz, tree.clazz.type);
4371 super.visitTypeTest(tree);
4372 }
4373 public void visitNewClass(JCNewClass tree) {
4374 if (tree.clazz.hasTag(ANNOTATED_TYPE)) {
4375 boolean prevCheck = this.checkAllAnnotations;
4376 try {
4377 this.checkAllAnnotations = true;
4378 scan(((JCAnnotatedType)tree.clazz).annotations);
4379 } finally {
4380 this.checkAllAnnotations = prevCheck;
4381 }
4382 }
4383 super.visitNewClass(tree);
4384 }
4385 public void visitNewArray(JCNewArray tree) {
4386 if (tree.elemtype != null && tree.elemtype.hasTag(ANNOTATED_TYPE)) {
4387 boolean prevCheck = this.checkAllAnnotations;
4388 try {
4389 this.checkAllAnnotations = true;
4390 scan(((JCAnnotatedType)tree.elemtype).annotations);
4391 } finally {
4392 this.checkAllAnnotations = prevCheck;
4393 }
4394 }
4395 super.visitNewArray(tree);
4396 }
4398 /* I would want to model this after
4399 * com.sun.tools.javac.comp.Check.Validator.visitSelectInternal(JCFieldAccess)
4400 * and override visitSelect and visitTypeApply.
4401 * However, we only set the annotated type in the top-level type
4402 * of the symbol.
4403 * Therefore, we need to override each individual location where a type
4404 * can occur.
4405 */
4406 private void validateAnnotatedType(final JCTree errtree, final Type type) {
4407 if (type.getEnclosingType() != null &&
4408 type != type.getEnclosingType()) {
4409 validateEnclosingAnnotatedType(errtree, type.getEnclosingType());
4410 }
4411 for (Type targ : type.getTypeArguments()) {
4412 validateAnnotatedType(errtree, targ);
4413 }
4414 }
4415 private void validateEnclosingAnnotatedType(final JCTree errtree, final Type type) {
4416 validateAnnotatedType(errtree, type);
4417 if (type.tsym != null &&
4418 type.tsym.isStatic() &&
4419 type.getAnnotationMirrors().nonEmpty()) {
4420 // Enclosing static classes cannot have type annotations.
4421 log.error(errtree.pos(), "cant.annotate.static.class");
4422 }
4423 }
4424 };
4426 // <editor-fold desc="post-attribution visitor">
4428 /**
4429 * Handle missing types/symbols in an AST. This routine is useful when
4430 * the compiler has encountered some errors (which might have ended up
4431 * terminating attribution abruptly); if the compiler is used in fail-over
4432 * mode (e.g. by an IDE) and the AST contains semantic errors, this routine
4433 * prevents NPE to be progagated during subsequent compilation steps.
4434 */
4435 public void postAttr(JCTree tree) {
4436 new PostAttrAnalyzer().scan(tree);
4437 }
4439 class PostAttrAnalyzer extends TreeScanner {
4441 private void initTypeIfNeeded(JCTree that) {
4442 if (that.type == null) {
4443 that.type = syms.unknownType;
4444 }
4445 }
4447 @Override
4448 public void scan(JCTree tree) {
4449 if (tree == null) return;
4450 if (tree instanceof JCExpression) {
4451 initTypeIfNeeded(tree);
4452 }
4453 super.scan(tree);
4454 }
4456 @Override
4457 public void visitIdent(JCIdent that) {
4458 if (that.sym == null) {
4459 that.sym = syms.unknownSymbol;
4460 }
4461 }
4463 @Override
4464 public void visitSelect(JCFieldAccess that) {
4465 if (that.sym == null) {
4466 that.sym = syms.unknownSymbol;
4467 }
4468 super.visitSelect(that);
4469 }
4471 @Override
4472 public void visitClassDef(JCClassDecl that) {
4473 initTypeIfNeeded(that);
4474 if (that.sym == null) {
4475 that.sym = new ClassSymbol(0, that.name, that.type, syms.noSymbol);
4476 }
4477 super.visitClassDef(that);
4478 }
4480 @Override
4481 public void visitMethodDef(JCMethodDecl that) {
4482 initTypeIfNeeded(that);
4483 if (that.sym == null) {
4484 that.sym = new MethodSymbol(0, that.name, that.type, syms.noSymbol);
4485 }
4486 super.visitMethodDef(that);
4487 }
4489 @Override
4490 public void visitVarDef(JCVariableDecl that) {
4491 initTypeIfNeeded(that);
4492 if (that.sym == null) {
4493 that.sym = new VarSymbol(0, that.name, that.type, syms.noSymbol);
4494 that.sym.adr = 0;
4495 }
4496 super.visitVarDef(that);
4497 }
4499 @Override
4500 public void visitNewClass(JCNewClass that) {
4501 if (that.constructor == null) {
4502 that.constructor = new MethodSymbol(0, names.init, syms.unknownType, syms.noSymbol);
4503 }
4504 if (that.constructorType == null) {
4505 that.constructorType = syms.unknownType;
4506 }
4507 super.visitNewClass(that);
4508 }
4510 @Override
4511 public void visitAssignop(JCAssignOp that) {
4512 if (that.operator == null)
4513 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4514 super.visitAssignop(that);
4515 }
4517 @Override
4518 public void visitBinary(JCBinary that) {
4519 if (that.operator == null)
4520 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4521 super.visitBinary(that);
4522 }
4524 @Override
4525 public void visitUnary(JCUnary that) {
4526 if (that.operator == null)
4527 that.operator = new OperatorSymbol(names.empty, syms.unknownType, -1, syms.noSymbol);
4528 super.visitUnary(that);
4529 }
4531 @Override
4532 public void visitLambda(JCLambda that) {
4533 super.visitLambda(that);
4534 if (that.descriptorType == null) {
4535 that.descriptorType = syms.unknownType;
4536 }
4537 if (that.targets == null) {
4538 that.targets = List.nil();
4539 }
4540 }
4542 @Override
4543 public void visitReference(JCMemberReference that) {
4544 super.visitReference(that);
4545 if (that.sym == null) {
4546 that.sym = new MethodSymbol(0, names.empty, syms.unknownType, syms.noSymbol);
4547 }
4548 if (that.descriptorType == null) {
4549 that.descriptorType = syms.unknownType;
4550 }
4551 if (that.targets == null) {
4552 that.targets = List.nil();
4553 }
4554 }
4555 }
4556 // </editor-fold>
4557 }
