1 /*
2 * Copyright (c) 1999, 2009, 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 */
25
26 package com.sun.tools.javac.comp;
27
28 import java.util.*;
29 import java.util.Set;
30 import javax.lang.model.element.ElementKind;
31 import javax.tools.JavaFileObject;
32
33 import com.sun.tools.javac.code.*;
34 import com.sun.tools.javac.jvm.*;
35 import com.sun.tools.javac.tree.*;
36 import com.sun.tools.javac.util.*;
37 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
38 import com.sun.tools.javac.util.List;
39
40 import com.sun.tools.javac.jvm.Target;
41 import com.sun.tools.javac.code.Symbol.*;
42 import com.sun.tools.javac.tree.JCTree.*;
43 import com.sun.tools.javac.code.Type.*;
44
45 import com.sun.source.tree.IdentifierTree;
46 import com.sun.source.tree.MemberSelectTree;
47 import com.sun.source.tree.TreeVisitor;
48 import com.sun.source.util.SimpleTreeVisitor;
49
50 import static com.sun.tools.javac.code.Flags.*;
51 import static com.sun.tools.javac.code.Kinds.*;
52 import static com.sun.tools.javac.code.TypeTags.*;
53
54 /** This is the main context-dependent analysis phase in GJC. It
55 * encompasses name resolution, type checking and constant folding as
56 * subtasks. Some subtasks involve auxiliary classes.
57 * @see Check
58 * @see Resolve
59 * @see ConstFold
60 * @see Infer
61 *
62 * <p><b>This is NOT part of any supported API.
63 * If you write code that depends on this, you do so at your own risk.
64 * This code and its internal interfaces are subject to change or
65 * deletion without notice.</b>
66 */
67 public class Attr extends JCTree.Visitor {
68 protected static final Context.Key<Attr> attrKey =
69 new Context.Key<Attr>();
70
71 final Names names;
72 final Log log;
73 final Symtab syms;
74 final Resolve rs;
75 final Infer infer;
76 final Check chk;
77 final MemberEnter memberEnter;
78 final TreeMaker make;
79 final ConstFold cfolder;
80 final Enter enter;
81 final Target target;
82 final Types types;
83 final JCDiagnostic.Factory diags;
84 final Annotate annotate;
85
86 public static Attr instance(Context context) {
87 Attr instance = context.get(attrKey);
88 if (instance == null)
89 instance = new Attr(context);
90 return instance;
91 }
92
93 protected Attr(Context context) {
94 context.put(attrKey, this);
95
96 names = Names.instance(context);
97 log = Log.instance(context);
98 syms = Symtab.instance(context);
99 rs = Resolve.instance(context);
100 chk = Check.instance(context);
101 memberEnter = MemberEnter.instance(context);
102 make = TreeMaker.instance(context);
103 enter = Enter.instance(context);
104 infer = Infer.instance(context);
105 cfolder = ConstFold.instance(context);
106 target = Target.instance(context);
107 types = Types.instance(context);
108 diags = JCDiagnostic.Factory.instance(context);
109 annotate = Annotate.instance(context);
110
111 Options options = Options.instance(context);
112
113 Source source = Source.instance(context);
114 allowGenerics = source.allowGenerics();
115 allowVarargs = source.allowVarargs();
116 allowEnums = source.allowEnums();
117 allowBoxing = source.allowBoxing();
118 allowCovariantReturns = source.allowCovariantReturns();
119 allowAnonOuterThis = source.allowAnonOuterThis();
120 allowStringsInSwitch = source.allowStringsInSwitch();
121 sourceName = source.name;
122 relax = (options.get("-retrofit") != null ||
123 options.get("-relax") != null);
124 useBeforeDeclarationWarning = options.get("useBeforeDeclarationWarning") != null;
125 enableSunApiLintControl = options.get("enableSunApiLintControl") != null;
126 }
127
128 /** Switch: relax some constraints for retrofit mode.
129 */
130 boolean relax;
131
132 /** Switch: support generics?
133 */
134 boolean allowGenerics;
135
136 /** Switch: allow variable-arity methods.
137 */
138 boolean allowVarargs;
139
140 /** Switch: support enums?
141 */
142 boolean allowEnums;
143
144 /** Switch: support boxing and unboxing?
145 */
146 boolean allowBoxing;
147
148 /** Switch: support covariant result types?
149 */
150 boolean allowCovariantReturns;
151
152 /** Switch: allow references to surrounding object from anonymous
153 * objects during constructor call?
154 */
155 boolean allowAnonOuterThis;
156
157 /**
158 * Switch: warn about use of variable before declaration?
159 * RFE: 6425594
160 */
161 boolean useBeforeDeclarationWarning;
162
163 /**
164 * Switch: allow lint infrastructure to control proprietary
165 * API warnings.
166 */
167 boolean enableSunApiLintControl;
168
169 /**
170 * Switch: allow strings in switch?
171 */
172 boolean allowStringsInSwitch;
173
174 /**
175 * Switch: name of source level; used for error reporting.
176 */
177 String sourceName;
178
179 /** Check kind and type of given tree against protokind and prototype.
180 * If check succeeds, store type in tree and return it.
181 * If check fails, store errType in tree and return it.
182 * No checks are performed if the prototype is a method type.
183 * It is not necessary in this case since we know that kind and type
184 * are correct.
185 *
186 * @param tree The tree whose kind and type is checked
187 * @param owntype The computed type of the tree
188 * @param ownkind The computed kind of the tree
189 * @param pkind The expected kind (or: protokind) of the tree
190 * @param pt The expected type (or: prototype) of the tree
191 */
192 Type check(JCTree tree, Type owntype, int ownkind, int pkind, Type pt) {
193 if (owntype.tag != ERROR && pt.tag != METHOD && pt.tag != FORALL) {
194 if ((ownkind & ~pkind) == 0) {
195 owntype = chk.checkType(tree.pos(), owntype, pt);
196 } else {
197 log.error(tree.pos(), "unexpected.type",
198 kindNames(pkind),
199 kindName(ownkind));
200 owntype = types.createErrorType(owntype);
201 }
202 }
203 tree.type = owntype;
204 return owntype;
205 }
206
207 /** Is given blank final variable assignable, i.e. in a scope where it
208 * may be assigned to even though it is final?
209 * @param v The blank final variable.
210 * @param env The current environment.
211 */
212 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
213 Symbol owner = env.info.scope.owner;
214 // owner refers to the innermost variable, method or
215 // initializer block declaration at this point.
216 return
217 v.owner == owner
218 ||
219 ((owner.name == names.init || // i.e. we are in a constructor
220 owner.kind == VAR || // i.e. we are in a variable initializer
221 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
222 &&
223 v.owner == owner.owner
224 &&
225 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
226 }
227
228 /** Check that variable can be assigned to.
229 * @param pos The current source code position.
230 * @param v The assigned varaible
231 * @param base If the variable is referred to in a Select, the part
232 * to the left of the `.', null otherwise.
233 * @param env The current environment.
234 */
235 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
236 if ((v.flags() & FINAL) != 0 &&
237 ((v.flags() & HASINIT) != 0
238 ||
239 !((base == null ||
240 (base.getTag() == JCTree.IDENT && TreeInfo.name(base) == names._this)) &&
241 isAssignableAsBlankFinal(v, env)))) {
242 log.error(pos, "cant.assign.val.to.final.var", v);
243 }
244 }
245
246 /** Does tree represent a static reference to an identifier?
247 * It is assumed that tree is either a SELECT or an IDENT.
248 * We have to weed out selects from non-type names here.
249 * @param tree The candidate tree.
250 */
251 boolean isStaticReference(JCTree tree) {
252 if (tree.getTag() == JCTree.SELECT) {
253 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
254 if (lsym == null || lsym.kind != TYP) {
255 return false;
256 }
257 }
258 return true;
259 }
260
261 /** Is this symbol a type?
262 */
263 static boolean isType(Symbol sym) {
264 return sym != null && sym.kind == TYP;
265 }
266
267 /** The current `this' symbol.
268 * @param env The current environment.
269 */
270 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
271 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
272 }
273
274 /** Attribute a parsed identifier.
275 * @param tree Parsed identifier name
276 * @param topLevel The toplevel to use
277 */
278 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
279 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
280 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
281 syms.errSymbol.name,
282 null, null, null, null);
283 localEnv.enclClass.sym = syms.errSymbol;
284 return tree.accept(identAttributer, localEnv);
285 }
286 // where
287 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
288 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
289 @Override
290 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
291 Symbol site = visit(node.getExpression(), env);
292 if (site.kind == ERR)
293 return site;
294 Name name = (Name)node.getIdentifier();
295 if (site.kind == PCK) {
296 env.toplevel.packge = (PackageSymbol)site;
297 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
298 } else {
299 env.enclClass.sym = (ClassSymbol)site;
300 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
301 }
302 }
303
304 @Override
305 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
306 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
307 }
308 }
309
310 public Type coerce(Type etype, Type ttype) {
311 return cfolder.coerce(etype, ttype);
312 }
313
314 public Type attribType(JCTree node, TypeSymbol sym) {
315 Env<AttrContext> env = enter.typeEnvs.get(sym);
316 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
317 return attribTree(node, localEnv, Kinds.TYP, Type.noType);
318 }
319
320 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
321 breakTree = tree;
322 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
323 try {
324 attribExpr(expr, env);
325 } catch (BreakAttr b) {
326 return b.env;
327 } finally {
328 breakTree = null;
329 log.useSource(prev);
330 }
331 return env;
332 }
333
334 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
335 breakTree = tree;
336 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
337 try {
338 attribStat(stmt, env);
339 } catch (BreakAttr b) {
340 return b.env;
341 } finally {
342 breakTree = null;
343 log.useSource(prev);
344 }
345 return env;
346 }
347
348 private JCTree breakTree = null;
349
350 private static class BreakAttr extends RuntimeException {
351 static final long serialVersionUID = -6924771130405446405L;
352 private Env<AttrContext> env;
353 private BreakAttr(Env<AttrContext> env) {
354 this.env = env;
355 }
356 }
357
358
359 /* ************************************************************************
360 * Visitor methods
361 *************************************************************************/
362
363 /** Visitor argument: the current environment.
364 */
365 Env<AttrContext> env;
366
367 /** Visitor argument: the currently expected proto-kind.
368 */
369 int pkind;
370
371 /** Visitor argument: the currently expected proto-type.
372 */
373 Type pt;
374
375 /** Visitor result: the computed type.
376 */
377 Type result;
378
379 /** Visitor method: attribute a tree, catching any completion failure
380 * exceptions. Return the tree's type.
381 *
382 * @param tree The tree to be visited.
383 * @param env The environment visitor argument.
384 * @param pkind The protokind visitor argument.
385 * @param pt The prototype visitor argument.
386 */
387 Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt) {
388 Env<AttrContext> prevEnv = this.env;
389 int prevPkind = this.pkind;
390 Type prevPt = this.pt;
391 try {
392 this.env = env;
393 this.pkind = pkind;
394 this.pt = pt;
395 tree.accept(this);
396 if (tree == breakTree)
397 throw new BreakAttr(env);
398 return result;
399 } catch (CompletionFailure ex) {
400 tree.type = syms.errType;
401 return chk.completionError(tree.pos(), ex);
402 } finally {
403 this.env = prevEnv;
404 this.pkind = prevPkind;
405 this.pt = prevPt;
406 }
407 }
408
409 /** Derived visitor method: attribute an expression tree.
410 */
411 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
412 return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType);
413 }
414
415 /** Derived visitor method: attribute an expression tree with
416 * no constraints on the computed type.
417 */
418 Type attribExpr(JCTree tree, Env<AttrContext> env) {
419 return attribTree(tree, env, VAL, Type.noType);
420 }
421
422 /** Derived visitor method: attribute a type tree.
423 */
424 Type attribType(JCTree tree, Env<AttrContext> env) {
425 Type result = attribType(tree, env, Type.noType);
426 return result;
427 }
428
429 /** Derived visitor method: attribute a type tree.
430 */
431 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
432 Type result = attribTree(tree, env, TYP, pt);
433 return result;
434 }
435
436 /** Derived visitor method: attribute a statement or definition tree.
437 */
438 public Type attribStat(JCTree tree, Env<AttrContext> env) {
439 return attribTree(tree, env, NIL, Type.noType);
440 }
441
442 /** Attribute a list of expressions, returning a list of types.
443 */
444 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
445 ListBuffer<Type> ts = new ListBuffer<Type>();
446 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
447 ts.append(attribExpr(l.head, env, pt));
448 return ts.toList();
449 }
450
451 /** Attribute a list of statements, returning nothing.
452 */
453 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
454 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
455 attribStat(l.head, env);
456 }
457
458 /** Attribute the arguments in a method call, returning a list of types.
459 */
460 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
461 ListBuffer<Type> argtypes = new ListBuffer<Type>();
462 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
463 argtypes.append(chk.checkNonVoid(
464 l.head.pos(), types.upperBound(attribTree(l.head, env, VAL, Infer.anyPoly))));
465 return argtypes.toList();
466 }
467
468 /** Attribute a type argument list, returning a list of types.
469 * Caller is responsible for calling checkRefTypes.
470 */
471 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
472 ListBuffer<Type> argtypes = new ListBuffer<Type>();
473 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
474 argtypes.append(attribType(l.head, env));
475 return argtypes.toList();
476 }
477
478 /** Attribute a type argument list, returning a list of types.
479 * Check that all the types are references.
480 */
481 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
482 List<Type> types = attribAnyTypes(trees, env);
483 return chk.checkRefTypes(trees, types);
484 }
485
486 /**
487 * Attribute type variables (of generic classes or methods).
488 * Compound types are attributed later in attribBounds.
489 * @param typarams the type variables to enter
490 * @param env the current environment
491 */
492 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
493 for (JCTypeParameter tvar : typarams) {
494 TypeVar a = (TypeVar)tvar.type;
495 a.tsym.flags_field |= UNATTRIBUTED;
496 a.bound = Type.noType;
497 if (!tvar.bounds.isEmpty()) {
498 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
499 for (JCExpression bound : tvar.bounds.tail)
500 bounds = bounds.prepend(attribType(bound, env));
501 types.setBounds(a, bounds.reverse());
502 } else {
503 // if no bounds are given, assume a single bound of
504 // java.lang.Object.
505 types.setBounds(a, List.of(syms.objectType));
506 }
507 a.tsym.flags_field &= ~UNATTRIBUTED;
508 }
509 for (JCTypeParameter tvar : typarams)
510 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
511 attribStats(typarams, env);
512 }
513
514 void attribBounds(List<JCTypeParameter> typarams) {
515 for (JCTypeParameter typaram : typarams) {
516 Type bound = typaram.type.getUpperBound();
517 if (bound != null && bound.tsym instanceof ClassSymbol) {
518 ClassSymbol c = (ClassSymbol)bound.tsym;
519 if ((c.flags_field & COMPOUND) != 0) {
520 assert (c.flags_field & UNATTRIBUTED) != 0 : c;
521 attribClass(typaram.pos(), c);
522 }
523 }
524 }
525 }
526
527 /**
528 * Attribute the type references in a list of annotations.
529 */
530 void attribAnnotationTypes(List<JCAnnotation> annotations,
531 Env<AttrContext> env) {
532 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
533 JCAnnotation a = al.head;
534 attribType(a.annotationType, env);
535 }
536 }
537
538 /** Attribute type reference in an `extends' or `implements' clause.
539 * Supertypes of anonymous inner classes are usually already attributed.
540 *
541 * @param tree The tree making up the type reference.
542 * @param env The environment current at the reference.
543 * @param classExpected true if only a class is expected here.
544 * @param interfaceExpected true if only an interface is expected here.
545 */
546 Type attribBase(JCTree tree,
547 Env<AttrContext> env,
548 boolean classExpected,
549 boolean interfaceExpected,
550 boolean checkExtensible) {
551 Type t = tree.type != null ?
552 tree.type :
553 attribType(tree, env);
554 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
555 }
556 Type checkBase(Type t,
557 JCTree tree,
558 Env<AttrContext> env,
559 boolean classExpected,
560 boolean interfaceExpected,
561 boolean checkExtensible) {
562 if (t.tag == TYPEVAR && !classExpected && !interfaceExpected) {
563 // check that type variable is already visible
564 if (t.getUpperBound() == null) {
565 log.error(tree.pos(), "illegal.forward.ref");
566 return types.createErrorType(t);
567 }
568 } else {
569 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
570 }
571 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
572 log.error(tree.pos(), "intf.expected.here");
573 // return errType is necessary since otherwise there might
574 // be undetected cycles which cause attribution to loop
575 return types.createErrorType(t);
576 } else if (checkExtensible &&
577 classExpected &&
578 (t.tsym.flags() & INTERFACE) != 0) {
579 log.error(tree.pos(), "no.intf.expected.here");
580 return types.createErrorType(t);
581 }
582 if (checkExtensible &&
583 ((t.tsym.flags() & FINAL) != 0)) {
584 log.error(tree.pos(),
585 "cant.inherit.from.final", t.tsym);
586 }
587 chk.checkNonCyclic(tree.pos(), t);
588 return t;
589 }
590
591 public void visitClassDef(JCClassDecl tree) {
592 // Local classes have not been entered yet, so we need to do it now:
593 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
594 enter.classEnter(tree, env);
595
596 ClassSymbol c = tree.sym;
597 if (c == null) {
598 // exit in case something drastic went wrong during enter.
599 result = null;
600 } else {
601 // make sure class has been completed:
602 c.complete();
603
604 // If this class appears as an anonymous class
605 // in a superclass constructor call where
606 // no explicit outer instance is given,
607 // disable implicit outer instance from being passed.
608 // (This would be an illegal access to "this before super").
609 if (env.info.isSelfCall &&
610 env.tree.getTag() == JCTree.NEWCLASS &&
611 ((JCNewClass) env.tree).encl == null)
612 {
613 c.flags_field |= NOOUTERTHIS;
614 }
615 attribClass(tree.pos(), c);
616 result = tree.type = c.type;
617 }
618 }
619
620 public void visitMethodDef(JCMethodDecl tree) {
621 MethodSymbol m = tree.sym;
622
623 Lint lint = env.info.lint.augment(m.attributes_field, m.flags());
624 Lint prevLint = chk.setLint(lint);
625 try {
626 chk.checkDeprecatedAnnotation(tree.pos(), m);
627
628 attribBounds(tree.typarams);
629
630 // If we override any other methods, check that we do so properly.
631 // JLS ???
632 chk.checkOverride(tree, m);
633
634 // Create a new environment with local scope
635 // for attributing the method.
636 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
637
638 localEnv.info.lint = lint;
639
640 // Enter all type parameters into the local method scope.
641 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
642 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
643
644 ClassSymbol owner = env.enclClass.sym;
645 if ((owner.flags() & ANNOTATION) != 0 &&
646 tree.params.nonEmpty())
647 log.error(tree.params.head.pos(),
648 "intf.annotation.members.cant.have.params");
649
650 // Attribute all value parameters.
651 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
652 attribStat(l.head, localEnv);
653 }
654
655 chk.checkVarargMethodDecl(tree);
656
657 // Check that type parameters are well-formed.
658 chk.validate(tree.typarams, localEnv);
659 if ((owner.flags() & ANNOTATION) != 0 &&
660 tree.typarams.nonEmpty())
661 log.error(tree.typarams.head.pos(),
662 "intf.annotation.members.cant.have.type.params");
663
664 // Check that result type is well-formed.
665 chk.validate(tree.restype, localEnv);
666 if ((owner.flags() & ANNOTATION) != 0)
667 chk.validateAnnotationType(tree.restype);
668
669 if ((owner.flags() & ANNOTATION) != 0)
670 chk.validateAnnotationMethod(tree.pos(), m);
671
672 // Check that all exceptions mentioned in the throws clause extend
673 // java.lang.Throwable.
674 if ((owner.flags() & ANNOTATION) != 0 && tree.thrown.nonEmpty())
675 log.error(tree.thrown.head.pos(),
676 "throws.not.allowed.in.intf.annotation");
677 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
678 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
679
680 if (tree.body == null) {
681 // Empty bodies are only allowed for
682 // abstract, native, or interface methods, or for methods
683 // in a retrofit signature class.
684 if ((owner.flags() & INTERFACE) == 0 &&
685 (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 &&
686 !relax)
687 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
688 if (tree.defaultValue != null) {
689 if ((owner.flags() & ANNOTATION) == 0)
690 log.error(tree.pos(),
691 "default.allowed.in.intf.annotation.member");
692 }
693 } else if ((owner.flags() & INTERFACE) != 0) {
694 log.error(tree.body.pos(), "intf.meth.cant.have.body");
695 } else if ((tree.mods.flags & ABSTRACT) != 0) {
696 log.error(tree.pos(), "abstract.meth.cant.have.body");
697 } else if ((tree.mods.flags & NATIVE) != 0) {
698 log.error(tree.pos(), "native.meth.cant.have.body");
699 } else {
700 // Add an implicit super() call unless an explicit call to
701 // super(...) or this(...) is given
702 // or we are compiling class java.lang.Object.
703 if (tree.name == names.init && owner.type != syms.objectType) {
704 JCBlock body = tree.body;
705 if (body.stats.isEmpty() ||
706 !TreeInfo.isSelfCall(body.stats.head)) {
707 body.stats = body.stats.
708 prepend(memberEnter.SuperCall(make.at(body.pos),
709 List.<Type>nil(),
710 List.<JCVariableDecl>nil(),
711 false));
712 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
713 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
714 TreeInfo.isSuperCall(body.stats.head)) {
715 // enum constructors are not allowed to call super
716 // directly, so make sure there aren't any super calls
717 // in enum constructors, except in the compiler
718 // generated one.
719 log.error(tree.body.stats.head.pos(),
720 "call.to.super.not.allowed.in.enum.ctor",
721 env.enclClass.sym);
722 }
723 }
724
725 // Attribute method body.
726 attribStat(tree.body, localEnv);
727 }
728 localEnv.info.scope.leave();
729 result = tree.type = m.type;
730 chk.validateAnnotations(tree.mods.annotations, m);
731 }
732 finally {
733 chk.setLint(prevLint);
734 }
735 }
736
737 public void visitVarDef(JCVariableDecl tree) {
738 // Local variables have not been entered yet, so we need to do it now:
739 if (env.info.scope.owner.kind == MTH) {
740 if (tree.sym != null) {
741 // parameters have already been entered
742 env.info.scope.enter(tree.sym);
743 } else {
744 memberEnter.memberEnter(tree, env);
745 annotate.flush();
746 }
747 }
748
749 VarSymbol v = tree.sym;
750 Lint lint = env.info.lint.augment(v.attributes_field, v.flags());
751 Lint prevLint = chk.setLint(lint);
752
753 // Check that the variable's declared type is well-formed.
754 chk.validate(tree.vartype, env);
755
756 try {
757 chk.checkDeprecatedAnnotation(tree.pos(), v);
758
759 if (tree.init != null) {
760 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
761 // In this case, `v' is final. Ensure that it's initializer is
762 // evaluated.
763 v.getConstValue(); // ensure initializer is evaluated
764 } else {
765 // Attribute initializer in a new environment
766 // with the declared variable as owner.
767 // Check that initializer conforms to variable's declared type.
768 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
769 initEnv.info.lint = lint;
770 // In order to catch self-references, we set the variable's
771 // declaration position to maximal possible value, effectively
772 // marking the variable as undefined.
773 initEnv.info.enclVar = v;
774 attribExpr(tree.init, initEnv, v.type);
775 }
776 }
777 result = tree.type = v.type;
778 chk.validateAnnotations(tree.mods.annotations, v);
779 }
780 finally {
781 chk.setLint(prevLint);
782 }
783 }
784
785 public void visitSkip(JCSkip tree) {
786 result = null;
787 }
788
789 public void visitBlock(JCBlock tree) {
790 if (env.info.scope.owner.kind == TYP) {
791 // Block is a static or instance initializer;
792 // let the owner of the environment be a freshly
793 // created BLOCK-method.
794 Env<AttrContext> localEnv =
795 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
796 localEnv.info.scope.owner =
797 new MethodSymbol(tree.flags | BLOCK, names.empty, null,
798 env.info.scope.owner);
799 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
800 attribStats(tree.stats, localEnv);
801 } else {
802 // Create a new local environment with a local scope.
803 Env<AttrContext> localEnv =
804 env.dup(tree, env.info.dup(env.info.scope.dup()));
805 attribStats(tree.stats, localEnv);
806 localEnv.info.scope.leave();
807 }
808 result = null;
809 }
810
811 public void visitDoLoop(JCDoWhileLoop tree) {
812 attribStat(tree.body, env.dup(tree));
813 attribExpr(tree.cond, env, syms.booleanType);
814 result = null;
815 }
816
817 public void visitWhileLoop(JCWhileLoop tree) {
818 attribExpr(tree.cond, env, syms.booleanType);
819 attribStat(tree.body, env.dup(tree));
820 result = null;
821 }
822
823 public void visitForLoop(JCForLoop tree) {
824 Env<AttrContext> loopEnv =
825 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
826 attribStats(tree.init, loopEnv);
827 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
828 loopEnv.tree = tree; // before, we were not in loop!
829 attribStats(tree.step, loopEnv);
830 attribStat(tree.body, loopEnv);
831 loopEnv.info.scope.leave();
832 result = null;
833 }
834
835 public void visitForeachLoop(JCEnhancedForLoop tree) {
836 Env<AttrContext> loopEnv =
837 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
838 attribStat(tree.var, loopEnv);
839 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
840 chk.checkNonVoid(tree.pos(), exprType);
841 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
842 if (elemtype == null) {
843 // or perhaps expr implements Iterable<T>?
844 Type base = types.asSuper(exprType, syms.iterableType.tsym);
845 if (base == null) {
846 log.error(tree.expr.pos(), "foreach.not.applicable.to.type");
847 elemtype = types.createErrorType(exprType);
848 } else {
849 List<Type> iterableParams = base.allparams();
850 elemtype = iterableParams.isEmpty()
851 ? syms.objectType
852 : types.upperBound(iterableParams.head);
853 }
854 }
855 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
856 loopEnv.tree = tree; // before, we were not in loop!
857 attribStat(tree.body, loopEnv);
858 loopEnv.info.scope.leave();
859 result = null;
860 }
861
862 public void visitLabelled(JCLabeledStatement tree) {
863 // Check that label is not used in an enclosing statement
864 Env<AttrContext> env1 = env;
865 while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) {
866 if (env1.tree.getTag() == JCTree.LABELLED &&
867 ((JCLabeledStatement) env1.tree).label == tree.label) {
868 log.error(tree.pos(), "label.already.in.use",
869 tree.label);
870 break;
871 }
872 env1 = env1.next;
873 }
874
875 attribStat(tree.body, env.dup(tree));
876 result = null;
877 }
878
879 public void visitSwitch(JCSwitch tree) {
880 Type seltype = attribExpr(tree.selector, env);
881
882 Env<AttrContext> switchEnv =
883 env.dup(tree, env.info.dup(env.info.scope.dup()));
884
885 boolean enumSwitch =
886 allowEnums &&
887 (seltype.tsym.flags() & Flags.ENUM) != 0;
888 boolean stringSwitch = false;
889 if (types.isSameType(seltype, syms.stringType)) {
890 if (allowStringsInSwitch) {
891 stringSwitch = true;
892 } else {
893 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
894 }
895 }
896 if (!enumSwitch && !stringSwitch)
897 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
898
899 // Attribute all cases and
900 // check that there are no duplicate case labels or default clauses.
901 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
902 boolean hasDefault = false; // Is there a default label?
903 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
904 JCCase c = l.head;
905 Env<AttrContext> caseEnv =
906 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
907 if (c.pat != null) {
908 if (enumSwitch) {
909 Symbol sym = enumConstant(c.pat, seltype);
910 if (sym == null) {
911 log.error(c.pat.pos(), "enum.const.req");
912 } else if (!labels.add(sym)) {
913 log.error(c.pos(), "duplicate.case.label");
914 }
915 } else {
916 Type pattype = attribExpr(c.pat, switchEnv, seltype);
917 if (pattype.tag != ERROR) {
918 if (pattype.constValue() == null) {
919 log.error(c.pat.pos(),
920 (stringSwitch ? "string.const.req" : "const.expr.req"));
921 } else if (labels.contains(pattype.constValue())) {
922 log.error(c.pos(), "duplicate.case.label");
923 } else {
924 labels.add(pattype.constValue());
925 }
926 }
927 }
928 } else if (hasDefault) {
929 log.error(c.pos(), "duplicate.default.label");
930 } else {
931 hasDefault = true;
932 }
933 attribStats(c.stats, caseEnv);
934 caseEnv.info.scope.leave();
935 addVars(c.stats, switchEnv.info.scope);
936 }
937
938 switchEnv.info.scope.leave();
939 result = null;
940 }
941 // where
942 /** Add any variables defined in stats to the switch scope. */
943 private static void addVars(List<JCStatement> stats, Scope switchScope) {
944 for (;stats.nonEmpty(); stats = stats.tail) {
945 JCTree stat = stats.head;
946 if (stat.getTag() == JCTree.VARDEF)
947 switchScope.enter(((JCVariableDecl) stat).sym);
948 }
949 }
950 // where
951 /** Return the selected enumeration constant symbol, or null. */
952 private Symbol enumConstant(JCTree tree, Type enumType) {
953 if (tree.getTag() != JCTree.IDENT) {
954 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
955 return syms.errSymbol;
956 }
957 JCIdent ident = (JCIdent)tree;
958 Name name = ident.name;
959 for (Scope.Entry e = enumType.tsym.members().lookup(name);
960 e.scope != null; e = e.next()) {
961 if (e.sym.kind == VAR) {
962 Symbol s = ident.sym = e.sym;
963 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
964 ident.type = s.type;
965 return ((s.flags_field & Flags.ENUM) == 0)
966 ? null : s;
967 }
968 }
969 return null;
970 }
971
972 public void visitSynchronized(JCSynchronized tree) {
973 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
974 attribStat(tree.body, env);
975 result = null;
976 }
977
978 public void visitTry(JCTry tree) {
979 // Attribute body
980 attribStat(tree.body, env.dup(tree, env.info.dup()));
981
982 // Attribute catch clauses
983 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
984 JCCatch c = l.head;
985 Env<AttrContext> catchEnv =
986 env.dup(c, env.info.dup(env.info.scope.dup()));
987 Type ctype = attribStat(c.param, catchEnv);
988 if (TreeInfo.isMultiCatch(c)) {
989 //check that multi-catch parameter is marked as final
990 if ((c.param.sym.flags() & FINAL) == 0) {
991 log.error(c.param.pos(), "multicatch.param.must.be.final", c.param.sym);
992 }
993 c.param.sym.flags_field = c.param.sym.flags() | DISJOINT;
994 }
995 if (c.param.type.tsym.kind == Kinds.VAR) {
996 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
997 }
998 chk.checkType(c.param.vartype.pos(),
999 chk.checkClassType(c.param.vartype.pos(), ctype),
1000 syms.throwableType);
1001 attribStat(c.body, catchEnv);
1002 catchEnv.info.scope.leave();
1003 }
1004
1005 // Attribute finalizer
1006 if (tree.finalizer != null) attribStat(tree.finalizer, env);
1007 result = null;
1008 }
1009
1010 public void visitConditional(JCConditional tree) {
1011 attribExpr(tree.cond, env, syms.booleanType);
1012 attribExpr(tree.truepart, env);
1013 attribExpr(tree.falsepart, env);
1014 result = check(tree,
1015 capture(condType(tree.pos(), tree.cond.type,
1016 tree.truepart.type, tree.falsepart.type)),
1017 VAL, pkind, pt);
1018 }
1019 //where
1020 /** Compute the type of a conditional expression, after
1021 * checking that it exists. See Spec 15.25.
1022 *
1023 * @param pos The source position to be used for
1024 * error diagnostics.
1025 * @param condtype The type of the expression's condition.
1026 * @param thentype The type of the expression's then-part.
1027 * @param elsetype The type of the expression's else-part.
1028 */
1029 private Type condType(DiagnosticPosition pos,
1030 Type condtype,
1031 Type thentype,
1032 Type elsetype) {
1033 Type ctype = condType1(pos, condtype, thentype, elsetype);
1034
1035 // If condition and both arms are numeric constants,
1036 // evaluate at compile-time.
1037 return ((condtype.constValue() != null) &&
1038 (thentype.constValue() != null) &&
1039 (elsetype.constValue() != null))
1040 ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype)
1041 : ctype;
1042 }
1043 /** Compute the type of a conditional expression, after
1044 * checking that it exists. Does not take into
1045 * account the special case where condition and both arms
1046 * are constants.
1047 *
1048 * @param pos The source position to be used for error
1049 * diagnostics.
1050 * @param condtype The type of the expression's condition.
1051 * @param thentype The type of the expression's then-part.
1052 * @param elsetype The type of the expression's else-part.
1053 */
1054 private Type condType1(DiagnosticPosition pos, Type condtype,
1055 Type thentype, Type elsetype) {
1056 // If same type, that is the result
1057 if (types.isSameType(thentype, elsetype))
1058 return thentype.baseType();
1059
1060 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1061 ? thentype : types.unboxedType(thentype);
1062 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1063 ? elsetype : types.unboxedType(elsetype);
1064
1065 // Otherwise, if both arms can be converted to a numeric
1066 // type, return the least numeric type that fits both arms
1067 // (i.e. return larger of the two, or return int if one
1068 // arm is short, the other is char).
1069 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1070 // If one arm has an integer subrange type (i.e., byte,
1071 // short, or char), and the other is an integer constant
1072 // that fits into the subrange, return the subrange type.
1073 if (thenUnboxed.tag < INT && elseUnboxed.tag == INT &&
1074 types.isAssignable(elseUnboxed, thenUnboxed))
1075 return thenUnboxed.baseType();
1076 if (elseUnboxed.tag < INT && thenUnboxed.tag == INT &&
1077 types.isAssignable(thenUnboxed, elseUnboxed))
1078 return elseUnboxed.baseType();
1079
1080 for (int i = BYTE; i < VOID; i++) {
1081 Type candidate = syms.typeOfTag[i];
1082 if (types.isSubtype(thenUnboxed, candidate) &&
1083 types.isSubtype(elseUnboxed, candidate))
1084 return candidate;
1085 }
1086 }
1087
1088 // Those were all the cases that could result in a primitive
1089 if (allowBoxing) {
1090 if (thentype.isPrimitive())
1091 thentype = types.boxedClass(thentype).type;
1092 if (elsetype.isPrimitive())
1093 elsetype = types.boxedClass(elsetype).type;
1094 }
1095
1096 if (types.isSubtype(thentype, elsetype))
1097 return elsetype.baseType();
1098 if (types.isSubtype(elsetype, thentype))
1099 return thentype.baseType();
1100
1101 if (!allowBoxing || thentype.tag == VOID || elsetype.tag == VOID) {
1102 log.error(pos, "neither.conditional.subtype",
1103 thentype, elsetype);
1104 return thentype.baseType();
1105 }
1106
1107 // both are known to be reference types. The result is
1108 // lub(thentype,elsetype). This cannot fail, as it will
1109 // always be possible to infer "Object" if nothing better.
1110 return types.lub(thentype.baseType(), elsetype.baseType());
1111 }
1112
1113 public void visitIf(JCIf tree) {
1114 attribExpr(tree.cond, env, syms.booleanType);
1115 attribStat(tree.thenpart, env);
1116 if (tree.elsepart != null)
1117 attribStat(tree.elsepart, env);
1118 chk.checkEmptyIf(tree);
1119 result = null;
1120 }
1121
1122 public void visitExec(JCExpressionStatement tree) {
1123 attribExpr(tree.expr, env);
1124 result = null;
1125 }
1126
1127 public void visitBreak(JCBreak tree) {
1128 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1129 result = null;
1130 }
1131
1132 public void visitContinue(JCContinue tree) {
1133 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1134 result = null;
1135 }
1136 //where
1137 /** Return the target of a break or continue statement, if it exists,
1138 * report an error if not.
1139 * Note: The target of a labelled break or continue is the
1140 * (non-labelled) statement tree referred to by the label,
1141 * not the tree representing the labelled statement itself.
1142 *
1143 * @param pos The position to be used for error diagnostics
1144 * @param tag The tag of the jump statement. This is either
1145 * Tree.BREAK or Tree.CONTINUE.
1146 * @param label The label of the jump statement, or null if no
1147 * label is given.
1148 * @param env The environment current at the jump statement.
1149 */
1150 private JCTree findJumpTarget(DiagnosticPosition pos,
1151 int tag,
1152 Name label,
1153 Env<AttrContext> env) {
1154 // Search environments outwards from the point of jump.
1155 Env<AttrContext> env1 = env;
1156 LOOP:
1157 while (env1 != null) {
1158 switch (env1.tree.getTag()) {
1159 case JCTree.LABELLED:
1160 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1161 if (label == labelled.label) {
1162 // If jump is a continue, check that target is a loop.
1163 if (tag == JCTree.CONTINUE) {
1164 if (labelled.body.getTag() != JCTree.DOLOOP &&
1165 labelled.body.getTag() != JCTree.WHILELOOP &&
1166 labelled.body.getTag() != JCTree.FORLOOP &&
1167 labelled.body.getTag() != JCTree.FOREACHLOOP)
1168 log.error(pos, "not.loop.label", label);
1169 // Found labelled statement target, now go inwards
1170 // to next non-labelled tree.
1171 return TreeInfo.referencedStatement(labelled);
1172 } else {
1173 return labelled;
1174 }
1175 }
1176 break;
1177 case JCTree.DOLOOP:
1178 case JCTree.WHILELOOP:
1179 case JCTree.FORLOOP:
1180 case JCTree.FOREACHLOOP:
1181 if (label == null) return env1.tree;
1182 break;
1183 case JCTree.SWITCH:
1184 if (label == null && tag == JCTree.BREAK) return env1.tree;
1185 break;
1186 case JCTree.METHODDEF:
1187 case JCTree.CLASSDEF:
1188 break LOOP;
1189 default:
1190 }
1191 env1 = env1.next;
1192 }
1193 if (label != null)
1194 log.error(pos, "undef.label", label);
1195 else if (tag == JCTree.CONTINUE)
1196 log.error(pos, "cont.outside.loop");
1197 else
1198 log.error(pos, "break.outside.switch.loop");
1199 return null;
1200 }
1201
1202 public void visitReturn(JCReturn tree) {
1203 // Check that there is an enclosing method which is
1204 // nested within than the enclosing class.
1205 if (env.enclMethod == null ||
1206 env.enclMethod.sym.owner != env.enclClass.sym) {
1207 log.error(tree.pos(), "ret.outside.meth");
1208
1209 } else {
1210 // Attribute return expression, if it exists, and check that
1211 // it conforms to result type of enclosing method.
1212 Symbol m = env.enclMethod.sym;
1213 if (m.type.getReturnType().tag == VOID) {
1214 if (tree.expr != null)
1215 log.error(tree.expr.pos(),
1216 "cant.ret.val.from.meth.decl.void");
1217 } else if (tree.expr == null) {
1218 log.error(tree.pos(), "missing.ret.val");
1219 } else {
1220 attribExpr(tree.expr, env, m.type.getReturnType());
1221 }
1222 }
1223 result = null;
1224 }
1225
1226 public void visitThrow(JCThrow tree) {
1227 attribExpr(tree.expr, env, syms.throwableType);
1228 result = null;
1229 }
1230
1231 public void visitAssert(JCAssert tree) {
1232 attribExpr(tree.cond, env, syms.booleanType);
1233 if (tree.detail != null) {
1234 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1235 }
1236 result = null;
1237 }
1238
1239 /** Visitor method for method invocations.
1240 * NOTE: The method part of an application will have in its type field
1241 * the return type of the method, not the method's type itself!
1242 */
1243 public void visitApply(JCMethodInvocation tree) {
1244 // The local environment of a method application is
1245 // a new environment nested in the current one.
1246 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1247
1248 // The types of the actual method arguments.
1249 List<Type> argtypes;
1250
1251 // The types of the actual method type arguments.
1252 List<Type> typeargtypes = null;
1253 boolean typeargtypesNonRefOK = false;
1254
1255 Name methName = TreeInfo.name(tree.meth);
1256
1257 boolean isConstructorCall =
1258 methName == names._this || methName == names._super;
1259
1260 if (isConstructorCall) {
1261 // We are seeing a ...this(...) or ...super(...) call.
1262 // Check that this is the first statement in a constructor.
1263 if (checkFirstConstructorStat(tree, env)) {
1264
1265 // Record the fact
1266 // that this is a constructor call (using isSelfCall).
1267 localEnv.info.isSelfCall = true;
1268
1269 // Attribute arguments, yielding list of argument types.
1270 argtypes = attribArgs(tree.args, localEnv);
1271 typeargtypes = attribTypes(tree.typeargs, localEnv);
1272
1273 // Variable `site' points to the class in which the called
1274 // constructor is defined.
1275 Type site = env.enclClass.sym.type;
1276 if (methName == names._super) {
1277 if (site == syms.objectType) {
1278 log.error(tree.meth.pos(), "no.superclass", site);
1279 site = types.createErrorType(syms.objectType);
1280 } else {
1281 site = types.supertype(site);
1282 }
1283 }
1284
1285 if (site.tag == CLASS) {
1286 Type encl = site.getEnclosingType();
1287 while (encl != null && encl.tag == TYPEVAR)
1288 encl = encl.getUpperBound();
1289 if (encl.tag == CLASS) {
1290 // we are calling a nested class
1291
1292 if (tree.meth.getTag() == JCTree.SELECT) {
1293 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1294
1295 // We are seeing a prefixed call, of the form
1296 // <expr>.super(...).
1297 // Check that the prefix expression conforms
1298 // to the outer instance type of the class.
1299 chk.checkRefType(qualifier.pos(),
1300 attribExpr(qualifier, localEnv,
1301 encl));
1302 } else if (methName == names._super) {
1303 // qualifier omitted; check for existence
1304 // of an appropriate implicit qualifier.
1305 rs.resolveImplicitThis(tree.meth.pos(),
1306 localEnv, site);
1307 }
1308 } else if (tree.meth.getTag() == JCTree.SELECT) {
1309 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1310 site.tsym);
1311 }
1312
1313 // if we're calling a java.lang.Enum constructor,
1314 // prefix the implicit String and int parameters
1315 if (site.tsym == syms.enumSym && allowEnums)
1316 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1317
1318 // Resolve the called constructor under the assumption
1319 // that we are referring to a superclass instance of the
1320 // current instance (JLS ???).
1321 boolean selectSuperPrev = localEnv.info.selectSuper;
1322 localEnv.info.selectSuper = true;
1323 localEnv.info.varArgs = false;
1324 Symbol sym = rs.resolveConstructor(
1325 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1326 localEnv.info.selectSuper = selectSuperPrev;
1327
1328 // Set method symbol to resolved constructor...
1329 TreeInfo.setSymbol(tree.meth, sym);
1330
1331 // ...and check that it is legal in the current context.
1332 // (this will also set the tree's type)
1333 Type mpt = newMethTemplate(argtypes, typeargtypes);
1334 checkId(tree.meth, site, sym, localEnv, MTH,
1335 mpt, tree.varargsElement != null);
1336 }
1337 // Otherwise, `site' is an error type and we do nothing
1338 }
1339 result = tree.type = syms.voidType;
1340 } else {
1341 // Otherwise, we are seeing a regular method call.
1342 // Attribute the arguments, yielding list of argument types, ...
1343 argtypes = attribArgs(tree.args, localEnv);
1344 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1345
1346 // ... and attribute the method using as a prototype a methodtype
1347 // whose formal argument types is exactly the list of actual
1348 // arguments (this will also set the method symbol).
1349 Type mpt = newMethTemplate(argtypes, typeargtypes);
1350 localEnv.info.varArgs = false;
1351 Type mtype = attribExpr(tree.meth, localEnv, mpt);
1352 if (localEnv.info.varArgs)
1353 assert mtype.isErroneous() || tree.varargsElement != null;
1354
1355 // Compute the result type.
1356 Type restype = mtype.getReturnType();
1357 assert restype.tag != WILDCARD : mtype;
1358
1359 // as a special case, array.clone() has a result that is
1360 // the same as static type of the array being cloned
1361 if (tree.meth.getTag() == JCTree.SELECT &&
1362 allowCovariantReturns &&
1363 methName == names.clone &&
1364 types.isArray(((JCFieldAccess) tree.meth).selected.type))
1365 restype = ((JCFieldAccess) tree.meth).selected.type;
1366
1367 // as a special case, x.getClass() has type Class<? extends |X|>
1368 if (allowGenerics &&
1369 methName == names.getClass && tree.args.isEmpty()) {
1370 Type qualifier = (tree.meth.getTag() == JCTree.SELECT)
1371 ? ((JCFieldAccess) tree.meth).selected.type
1372 : env.enclClass.sym.type;
1373 restype = new
1374 ClassType(restype.getEnclosingType(),
1375 List.<Type>of(new WildcardType(types.erasure(qualifier),
1376 BoundKind.EXTENDS,
1377 syms.boundClass)),
1378 restype.tsym);
1379 }
1380
1381 // as a special case, MethodHandle.<T>invoke(abc) and InvokeDynamic.<T>foo(abc)
1382 // has type <T>, and T can be a primitive type.
1383 if (tree.meth.getTag() == JCTree.SELECT && !typeargtypes.isEmpty()) {
1384 JCFieldAccess mfield = (JCFieldAccess) tree.meth;
1385 if ((mfield.selected.type.tsym != null &&
1386 (mfield.selected.type.tsym.flags() & POLYMORPHIC_SIGNATURE) != 0)
1387 ||
1388 (mfield.sym != null &&
1389 (mfield.sym.flags() & POLYMORPHIC_SIGNATURE) != 0)) {
1390 assert types.isSameType(restype, typeargtypes.head) : mtype;
1391 assert mfield.selected.type == syms.methodHandleType
1392 || mfield.selected.type == syms.invokeDynamicType;
1393 typeargtypesNonRefOK = true;
1394 }
1395 }
1396
1397 if (!typeargtypesNonRefOK) {
1398 chk.checkRefTypes(tree.typeargs, typeargtypes);
1399 }
1400
1401 // Check that value of resulting type is admissible in the
1402 // current context. Also, capture the return type
1403 result = check(tree, capture(restype), VAL, pkind, pt);
1404 }
1405 chk.validate(tree.typeargs, localEnv);
1406 }
1407 //where
1408 /** Check that given application node appears as first statement
1409 * in a constructor call.
1410 * @param tree The application node
1411 * @param env The environment current at the application.
1412 */
1413 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1414 JCMethodDecl enclMethod = env.enclMethod;
1415 if (enclMethod != null && enclMethod.name == names.init) {
1416 JCBlock body = enclMethod.body;
1417 if (body.stats.head.getTag() == JCTree.EXEC &&
1418 ((JCExpressionStatement) body.stats.head).expr == tree)
1419 return true;
1420 }
1421 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1422 TreeInfo.name(tree.meth));
1423 return false;
1424 }
1425
1426 /** Obtain a method type with given argument types.
1427 */
1428 Type newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) {
1429 MethodType mt = new MethodType(argtypes, null, null, syms.methodClass);
1430 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1431 }
1432
1433 public void visitNewClass(JCNewClass tree) {
1434 Type owntype = types.createErrorType(tree.type);
1435
1436 // The local environment of a class creation is
1437 // a new environment nested in the current one.
1438 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1439
1440 // The anonymous inner class definition of the new expression,
1441 // if one is defined by it.
1442 JCClassDecl cdef = tree.def;
1443
1444 // If enclosing class is given, attribute it, and
1445 // complete class name to be fully qualified
1446 JCExpression clazz = tree.clazz; // Class field following new
1447 JCExpression clazzid = // Identifier in class field
1448 (clazz.getTag() == JCTree.TYPEAPPLY)
1449 ? ((JCTypeApply) clazz).clazz
1450 : clazz;
1451
1452 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1453
1454 if (tree.encl != null) {
1455 // We are seeing a qualified new, of the form
1456 // <expr>.new C <...> (...) ...
1457 // In this case, we let clazz stand for the name of the
1458 // allocated class C prefixed with the type of the qualifier
1459 // expression, so that we can
1460 // resolve it with standard techniques later. I.e., if
1461 // <expr> has type T, then <expr>.new C <...> (...)
1462 // yields a clazz T.C.
1463 Type encltype = chk.checkRefType(tree.encl.pos(),
1464 attribExpr(tree.encl, env));
1465 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1466 ((JCIdent) clazzid).name);
1467 if (clazz.getTag() == JCTree.TYPEAPPLY)
1468 clazz = make.at(tree.pos).
1469 TypeApply(clazzid1,
1470 ((JCTypeApply) clazz).arguments);
1471 else
1472 clazz = clazzid1;
1473 }
1474
1475 // Attribute clazz expression and store
1476 // symbol + type back into the attributed tree.
1477 Type clazztype = attribType(clazz, env);
1478 Pair<Scope,Scope> mapping = getSyntheticScopeMapping(clazztype);
1479 if (!TreeInfo.isDiamond(tree)) {
1480 clazztype = chk.checkClassType(
1481 tree.clazz.pos(), clazztype, true);
1482 }
1483 chk.validate(clazz, localEnv);
1484 if (tree.encl != null) {
1485 // We have to work in this case to store
1486 // symbol + type back into the attributed tree.
1487 tree.clazz.type = clazztype;
1488 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1489 clazzid.type = ((JCIdent) clazzid).sym.type;
1490 if (!clazztype.isErroneous()) {
1491 if (cdef != null && clazztype.tsym.isInterface()) {
1492 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1493 } else if (clazztype.tsym.isStatic()) {
1494 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1495 }
1496 }
1497 } else if (!clazztype.tsym.isInterface() &&
1498 clazztype.getEnclosingType().tag == CLASS) {
1499 // Check for the existence of an apropos outer instance
1500 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1501 }
1502
1503 // Attribute constructor arguments.
1504 List<Type> argtypes = attribArgs(tree.args, localEnv);
1505 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1506
1507 if (TreeInfo.isDiamond(tree)) {
1508 clazztype = attribDiamond(localEnv, tree, clazztype, mapping, argtypes, typeargtypes, true);
1509 clazz.type = clazztype;
1510 }
1511
1512 // If we have made no mistakes in the class type...
1513 if (clazztype.tag == CLASS) {
1514 // Enums may not be instantiated except implicitly
1515 if (allowEnums &&
1516 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1517 (env.tree.getTag() != JCTree.VARDEF ||
1518 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1519 ((JCVariableDecl) env.tree).init != tree))
1520 log.error(tree.pos(), "enum.cant.be.instantiated");
1521 // Check that class is not abstract
1522 if (cdef == null &&
1523 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
1524 log.error(tree.pos(), "abstract.cant.be.instantiated",
1525 clazztype.tsym);
1526 } else if (cdef != null && clazztype.tsym.isInterface()) {
1527 // Check that no constructor arguments are given to
1528 // anonymous classes implementing an interface
1529 if (!argtypes.isEmpty())
1530 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
1531
1532 if (!typeargtypes.isEmpty())
1533 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
1534
1535 // Error recovery: pretend no arguments were supplied.
1536 argtypes = List.nil();
1537 typeargtypes = List.nil();
1538 }
1539
1540 // Resolve the called constructor under the assumption
1541 // that we are referring to a superclass instance of the
1542 // current instance (JLS ???).
1543 else {
1544 localEnv.info.selectSuper = cdef != null;
1545 localEnv.info.varArgs = false;
1546 tree.constructor = rs.resolveConstructor(
1547 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
1548 tree.constructorType = checkMethod(clazztype,
1549 tree.constructor,
1550 localEnv,
1551 tree.args,
1552 argtypes,
1553 typeargtypes,
1554 localEnv.info.varArgs);
1555 if (localEnv.info.varArgs)
1556 assert tree.constructorType.isErroneous() || tree.varargsElement != null;
1557 }
1558
1559 if (cdef != null) {
1560 // We are seeing an anonymous class instance creation.
1561 // In this case, the class instance creation
1562 // expression
1563 //
1564 // E.new <typeargs1>C<typargs2>(args) { ... }
1565 //
1566 // is represented internally as
1567 //
1568 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
1569 //
1570 // This expression is then *transformed* as follows:
1571 //
1572 // (1) add a STATIC flag to the class definition
1573 // if the current environment is static
1574 // (2) add an extends or implements clause
1575 // (3) add a constructor.
1576 //
1577 // For instance, if C is a class, and ET is the type of E,
1578 // the expression
1579 //
1580 // E.new <typeargs1>C<typargs2>(args) { ... }
1581 //
1582 // is translated to (where X is a fresh name and typarams is the
1583 // parameter list of the super constructor):
1584 //
1585 // new <typeargs1>X(<*nullchk*>E, args) where
1586 // X extends C<typargs2> {
1587 // <typarams> X(ET e, args) {
1588 // e.<typeargs1>super(args)
1589 // }
1590 // ...
1591 // }
1592 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
1593
1594 if (clazztype.tsym.isInterface()) {
1595 cdef.implementing = List.of(clazz);
1596 } else {
1597 cdef.extending = clazz;
1598 }
1599
1600 attribStat(cdef, localEnv);
1601
1602 // If an outer instance is given,
1603 // prefix it to the constructor arguments
1604 // and delete it from the new expression
1605 if (tree.encl != null && !clazztype.tsym.isInterface()) {
1606 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
1607 argtypes = argtypes.prepend(tree.encl.type);
1608 tree.encl = null;
1609 }
1610
1611 // Reassign clazztype and recompute constructor.
1612 clazztype = cdef.sym.type;
1613 Symbol sym = rs.resolveConstructor(
1614 tree.pos(), localEnv, clazztype, argtypes,
1615 typeargtypes, true, tree.varargsElement != null);
1616 assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous();
1617 tree.constructor = sym;
1618 if (tree.constructor.kind > ERRONEOUS) {
1619 tree.constructorType = syms.errType;
1620 }
1621 else {
1622 tree.constructorType = checkMethod(clazztype,
1623 tree.constructor,
1624 localEnv,
1625 tree.args,
1626 argtypes,
1627 typeargtypes,
1628 localEnv.info.varArgs);
1629 }
1630 }
1631
1632 if (tree.constructor != null && tree.constructor.kind == MTH)
1633 owntype = clazztype;
1634 }
1635 result = check(tree, owntype, VAL, pkind, pt);
1636 chk.validate(tree.typeargs, localEnv);
1637 }
1638
1639 Type attribDiamond(Env<AttrContext> env,
1640 JCNewClass tree,
1641 Type clazztype,
1642 Pair<Scope, Scope> mapping,
1643 List<Type> argtypes,
1644 List<Type> typeargtypes,
1645 boolean reportErrors) {
1646 if (clazztype.isErroneous() || mapping == erroneousMapping) {
1647 //if the type of the instance creation expression is erroneous,
1648 //or something prevented us to form a valid mapping, return the
1649 //(possibly erroneous) type unchanged
1650 return clazztype;
1651 }
1652 else if (clazztype.isInterface()) {
1653 //if the type of the instance creation expression is an interface
1654 //skip the method resolution step (JLS 15.12.2.7). The type to be
1655 //inferred is of the kind <X1,X2, ... Xn>C<X1,X2, ... Xn>
1656 clazztype = new ForAll(clazztype.tsym.type.allparams(),
1657 clazztype.tsym.type);
1658 } else {
1659 //if the type of the instance creation expression is a class type
1660 //apply method resolution inference (JLS 15.12.2.7). The return type
1661 //of the resolved constructor will be a partially instantiated type
1662 ((ClassSymbol) clazztype.tsym).members_field = mapping.snd;
1663 Symbol constructor;
1664 try {
1665 constructor = rs.resolveDiamond(tree.pos(),
1666 env,
1667 clazztype.tsym.type,
1668 argtypes,
1669 typeargtypes, reportErrors);
1670 } finally {
1671 ((ClassSymbol) clazztype.tsym).members_field = mapping.fst;
1672 }
1673 if (constructor.kind == MTH) {
1674 ClassType ct = new ClassType(clazztype.getEnclosingType(),
1675 clazztype.tsym.type.getTypeArguments(),
1676 clazztype.tsym);
1677 clazztype = checkMethod(ct,
1678 constructor,
1679 env,
1680 tree.args,
1681 argtypes,
1682 typeargtypes,
1683 env.info.varArgs).getReturnType();
1684 } else {
1685 clazztype = syms.errType;
1686 }
1687 }
1688 if (clazztype.tag == FORALL && !pt.isErroneous()) {
1689 //if the resolved constructor's return type has some uninferred
1690 //type-variables, infer them using the expected type and declared
1691 //bounds (JLS 15.12.2.8).
1692 try {
1693 clazztype = infer.instantiateExpr((ForAll) clazztype,
1694 pt.tag == NONE ? syms.objectType : pt,
1695 Warner.noWarnings);
1696 } catch (Infer.InferenceException ex) {
1697 //an error occurred while inferring uninstantiated type-variables
1698 //we need to optionally report an error
1699 if (reportErrors) {
1700 log.error(tree.clazz.pos(),
1701 "cant.apply.diamond.1",
1702 diags.fragment("diamond", clazztype.tsym),
1703 ex.diagnostic);
1704 }
1705 }
1706 }
1707 if (reportErrors) {
1708 clazztype = chk.checkClassType(tree.clazz.pos(),
1709 clazztype,
1710 true);
1711 if (clazztype.tag == CLASS) {
1712 List<Type> invalidDiamondArgs = chk.checkDiamond((ClassType)clazztype);
1713 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
1714 //one or more types inferred in the previous steps is either a
1715 //captured type or an intersection type --- we need to report an error.
1716 String subkey = invalidDiamondArgs.size() > 1 ?
1717 "diamond.invalid.args" :
1718 "diamond.invalid.arg";
1719 //The error message is of the kind:
1720 //
1721 //cannot infer type arguments for {clazztype}<>;
1722 //reason: {subkey}
1723 //
1724 //where subkey is a fragment of the kind:
1725 //
1726 //type argument(s) {invalidDiamondArgs} inferred for {clazztype}<> is not allowed in this context
1727 log.error(tree.clazz.pos(),
1728 "cant.apply.diamond.1",
1729 diags.fragment("diamond", clazztype.tsym),
1730 diags.fragment(subkey,
1731 invalidDiamondArgs,
1732 diags.fragment("diamond", clazztype.tsym)));
1733 }
1734 }
1735 }
1736 return clazztype;
1737 }
1738
1739 /** Creates a synthetic scope containing fake generic constructors.
1740 * Assuming that the original scope contains a constructor of the kind:
1741 * Foo(X x, Y y), where X,Y are class type-variables declared in Foo,
1742 * the synthetic scope is added a generic constructor of the kind:
1743 * <X,Y>Foo<X,Y>(X x, Y y). This is crucial in order to enable diamond
1744 * inference. The inferred return type of the synthetic constructor IS
1745 * the inferred type for the diamond operator.
1746 */
1747 private Pair<Scope, Scope> getSyntheticScopeMapping(Type ctype) {
1748 if (ctype.tag != CLASS) {
1749 return erroneousMapping;
1750 }
1751 Pair<Scope, Scope> mapping =
1752 new Pair<Scope, Scope>(ctype.tsym.members(), new Scope(ctype.tsym));
1753 List<Type> typevars = ctype.tsym.type.getTypeArguments();
1754 for (Scope.Entry e = mapping.fst.lookup(names.init);
1755 e.scope != null;
1756 e = e.next()) {
1757 MethodSymbol newConstr = (MethodSymbol) e.sym.clone(ctype.tsym);
1758 newConstr.name = names.init;
1759 List<Type> oldTypeargs = List.nil();
1760 if (newConstr.type.tag == FORALL) {
1761 oldTypeargs = ((ForAll) newConstr.type).tvars;
1762 }
1763 newConstr.type = new MethodType(newConstr.type.getParameterTypes(),
1764 new ClassType(ctype.getEnclosingType(), ctype.tsym.type.getTypeArguments(), ctype.tsym),
1765 newConstr.type.getThrownTypes(),
1766 syms.methodClass);
1767 newConstr.type = new ForAll(typevars.prependList(oldTypeargs), newConstr.type);
1768 mapping.snd.enter(newConstr);
1769 }
1770 return mapping;
1771 }
1772
1773 private final Pair<Scope,Scope> erroneousMapping = new Pair<Scope,Scope>(null, null);
1774
1775 /** Make an attributed null check tree.
1776 */
1777 public JCExpression makeNullCheck(JCExpression arg) {
1778 // optimization: X.this is never null; skip null check
1779 Name name = TreeInfo.name(arg);
1780 if (name == names._this || name == names._super) return arg;
1781
1782 int optag = JCTree.NULLCHK;
1783 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
1784 tree.operator = syms.nullcheck;
1785 tree.type = arg.type;
1786 return tree;
1787 }
1788
1789 public void visitNewArray(JCNewArray tree) {
1790 Type owntype = types.createErrorType(tree.type);
1791 Type elemtype;
1792 if (tree.elemtype != null) {
1793 elemtype = attribType(tree.elemtype, env);
1794 chk.validate(tree.elemtype, env);
1795 owntype = elemtype;
1796 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1797 attribExpr(l.head, env, syms.intType);
1798 owntype = new ArrayType(owntype, syms.arrayClass);
1799 }
1800 } else {
1801 // we are seeing an untyped aggregate { ... }
1802 // this is allowed only if the prototype is an array
1803 if (pt.tag == ARRAY) {
1804 elemtype = types.elemtype(pt);
1805 } else {
1806 if (pt.tag != ERROR) {
1807 log.error(tree.pos(), "illegal.initializer.for.type",
1808 pt);
1809 }
1810 elemtype = types.createErrorType(pt);
1811 }
1812 }
1813 if (tree.elems != null) {
1814 attribExprs(tree.elems, env, elemtype);
1815 owntype = new ArrayType(elemtype, syms.arrayClass);
1816 }
1817 if (!types.isReifiable(elemtype))
1818 log.error(tree.pos(), "generic.array.creation");
1819 result = check(tree, owntype, VAL, pkind, pt);
1820 }
1821
1822 public void visitParens(JCParens tree) {
1823 Type owntype = attribTree(tree.expr, env, pkind, pt);
1824 result = check(tree, owntype, pkind, pkind, pt);
1825 Symbol sym = TreeInfo.symbol(tree);
1826 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
1827 log.error(tree.pos(), "illegal.start.of.type");
1828 }
1829
1830 public void visitAssign(JCAssign tree) {
1831 Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType);
1832 Type capturedType = capture(owntype);
1833 attribExpr(tree.rhs, env, owntype);
1834 result = check(tree, capturedType, VAL, pkind, pt);
1835 }
1836
1837 public void visitAssignop(JCAssignOp tree) {
1838 // Attribute arguments.
1839 Type owntype = attribTree(tree.lhs, env, VAR, Type.noType);
1840 Type operand = attribExpr(tree.rhs, env);
1841 // Find operator.
1842 Symbol operator = tree.operator = rs.resolveBinaryOperator(
1843 tree.pos(), tree.getTag() - JCTree.ASGOffset, env,
1844 owntype, operand);
1845
1846 if (operator.kind == MTH) {
1847 chk.checkOperator(tree.pos(),
1848 (OperatorSymbol)operator,
1849 tree.getTag() - JCTree.ASGOffset,
1850 owntype,
1851 operand);
1852 chk.checkDivZero(tree.rhs.pos(), operator, operand);
1853 chk.checkCastable(tree.rhs.pos(),
1854 operator.type.getReturnType(),
1855 owntype);
1856 }
1857 result = check(tree, owntype, VAL, pkind, pt);
1858 }
1859
1860 public void visitUnary(JCUnary tree) {
1861 // Attribute arguments.
1862 Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1863 ? attribTree(tree.arg, env, VAR, Type.noType)
1864 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
1865
1866 // Find operator.
1867 Symbol operator = tree.operator =
1868 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
1869
1870 Type owntype = types.createErrorType(tree.type);
1871 if (operator.kind == MTH) {
1872 owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1873 ? tree.arg.type
1874 : operator.type.getReturnType();
1875 int opc = ((OperatorSymbol)operator).opcode;
1876
1877 // If the argument is constant, fold it.
1878 if (argtype.constValue() != null) {
1879 Type ctype = cfolder.fold1(opc, argtype);
1880 if (ctype != null) {
1881 owntype = cfolder.coerce(ctype, owntype);
1882
1883 // Remove constant types from arguments to
1884 // conserve space. The parser will fold concatenations
1885 // of string literals; the code here also
1886 // gets rid of intermediate results when some of the
1887 // operands are constant identifiers.
1888 if (tree.arg.type.tsym == syms.stringType.tsym) {
1889 tree.arg.type = syms.stringType;
1890 }
1891 }
1892 }
1893 }
1894 result = check(tree, owntype, VAL, pkind, pt);
1895 }
1896
1897 public void visitBinary(JCBinary tree) {
1898 // Attribute arguments.
1899 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
1900 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
1901
1902 // Find operator.
1903 Symbol operator = tree.operator =
1904 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
1905
1906 Type owntype = types.createErrorType(tree.type);
1907 if (operator.kind == MTH) {
1908 owntype = operator.type.getReturnType();
1909 int opc = chk.checkOperator(tree.lhs.pos(),
1910 (OperatorSymbol)operator,
1911 tree.getTag(),
1912 left,
1913 right);
1914
1915 // If both arguments are constants, fold them.
1916 if (left.constValue() != null && right.constValue() != null) {
1917 Type ctype = cfolder.fold2(opc, left, right);
1918 if (ctype != null) {
1919 owntype = cfolder.coerce(ctype, owntype);
1920
1921 // Remove constant types from arguments to
1922 // conserve space. The parser will fold concatenations
1923 // of string literals; the code here also
1924 // gets rid of intermediate results when some of the
1925 // operands are constant identifiers.
1926 if (tree.lhs.type.tsym == syms.stringType.tsym) {
1927 tree.lhs.type = syms.stringType;
1928 }
1929 if (tree.rhs.type.tsym == syms.stringType.tsym) {
1930 tree.rhs.type = syms.stringType;
1931 }
1932 }
1933 }
1934
1935 // Check that argument types of a reference ==, != are
1936 // castable to each other, (JLS???).
1937 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
1938 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
1939 log.error(tree.pos(), "incomparable.types", left, right);
1940 }
1941 }
1942
1943 chk.checkDivZero(tree.rhs.pos(), operator, right);
1944 }
1945 result = check(tree, owntype, VAL, pkind, pt);
1946 }
1947
1948 public void visitTypeCast(JCTypeCast tree) {
1949 Type clazztype = attribType(tree.clazz, env);
1950 chk.validate(tree.clazz, env);
1951 Type exprtype = attribExpr(tree.expr, env, Infer.anyPoly);
1952 Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
1953 if (exprtype.constValue() != null)
1954 owntype = cfolder.coerce(exprtype, owntype);
1955 result = check(tree, capture(owntype), VAL, pkind, pt);
1956 }
1957
1958 public void visitTypeTest(JCInstanceOf tree) {
1959 Type exprtype = chk.checkNullOrRefType(
1960 tree.expr.pos(), attribExpr(tree.expr, env));
1961 Type clazztype = chk.checkReifiableReferenceType(
1962 tree.clazz.pos(), attribType(tree.clazz, env));
1963 chk.validate(tree.clazz, env);
1964 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
1965 result = check(tree, syms.booleanType, VAL, pkind, pt);
1966 }
1967
1968 public void visitIndexed(JCArrayAccess tree) {
1969 Type owntype = types.createErrorType(tree.type);
1970 Type atype = attribExpr(tree.indexed, env);
1971 attribExpr(tree.index, env, syms.intType);
1972 if (types.isArray(atype))
1973 owntype = types.elemtype(atype);
1974 else if (atype.tag != ERROR)
1975 log.error(tree.pos(), "array.req.but.found", atype);
1976 if ((pkind & VAR) == 0) owntype = capture(owntype);
1977 result = check(tree, owntype, VAR, pkind, pt);
1978 }
1979
1980 public void visitIdent(JCIdent tree) {
1981 Symbol sym;
1982 boolean varArgs = false;
1983
1984 // Find symbol
1985 if (pt.tag == METHOD || pt.tag == FORALL) {
1986 // If we are looking for a method, the prototype `pt' will be a
1987 // method type with the type of the call's arguments as parameters.
1988 env.info.varArgs = false;
1989 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments());
1990 varArgs = env.info.varArgs;
1991 } else if (tree.sym != null && tree.sym.kind != VAR) {
1992 sym = tree.sym;
1993 } else {
1994 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind);
1995 }
1996 tree.sym = sym;
1997
1998 // (1) Also find the environment current for the class where
1999 // sym is defined (`symEnv').
2000 // Only for pre-tiger versions (1.4 and earlier):
2001 // (2) Also determine whether we access symbol out of an anonymous
2002 // class in a this or super call. This is illegal for instance
2003 // members since such classes don't carry a this$n link.
2004 // (`noOuterThisPath').
2005 Env<AttrContext> symEnv = env;
2006 boolean noOuterThisPath = false;
2007 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
2008 (sym.kind & (VAR | MTH | TYP)) != 0 &&
2009 sym.owner.kind == TYP &&
2010 tree.name != names._this && tree.name != names._super) {
2011
2012 // Find environment in which identifier is defined.
2013 while (symEnv.outer != null &&
2014 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
2015 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
2016 noOuterThisPath = !allowAnonOuterThis;
2017 symEnv = symEnv.outer;
2018 }
2019 }
2020
2021 // If symbol is a variable, ...
2022 if (sym.kind == VAR) {
2023 VarSymbol v = (VarSymbol)sym;
2024
2025 // ..., evaluate its initializer, if it has one, and check for
2026 // illegal forward reference.
2027 checkInit(tree, env, v, false);
2028
2029 // If symbol is a local variable accessed from an embedded
2030 // inner class check that it is final.
2031 if (v.owner.kind == MTH &&
2032 v.owner != env.info.scope.owner &&
2033 (v.flags_field & FINAL) == 0) {
2034 log.error(tree.pos(),
2035 "local.var.accessed.from.icls.needs.final",
2036 v);
2037 }
2038
2039 // If we are expecting a variable (as opposed to a value), check
2040 // that the variable is assignable in the current environment.
2041 if (pkind == VAR)
2042 checkAssignable(tree.pos(), v, null, env);
2043 }
2044
2045 // In a constructor body,
2046 // if symbol is a field or instance method, check that it is
2047 // not accessed before the supertype constructor is called.
2048 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
2049 (sym.kind & (VAR | MTH)) != 0 &&
2050 sym.owner.kind == TYP &&
2051 (sym.flags() & STATIC) == 0) {
2052 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
2053 }
2054 Env<AttrContext> env1 = env;
2055 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
2056 // If the found symbol is inaccessible, then it is
2057 // accessed through an enclosing instance. Locate this
2058 // enclosing instance:
2059 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
2060 env1 = env1.outer;
2061 }
2062 result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs);
2063 }
2064
2065 public void visitSelect(JCFieldAccess tree) {
2066 // Determine the expected kind of the qualifier expression.
2067 int skind = 0;
2068 if (tree.name == names._this || tree.name == names._super ||
2069 tree.name == names._class)
2070 {
2071 skind = TYP;
2072 } else {
2073 if ((pkind & PCK) != 0) skind = skind | PCK;
2074 if ((pkind & TYP) != 0) skind = skind | TYP | PCK;
2075 if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
2076 }
2077
2078 // Attribute the qualifier expression, and determine its symbol (if any).
2079 Type site = attribTree(tree.selected, env, skind, Infer.anyPoly);
2080 if ((pkind & (PCK | TYP)) == 0)
2081 site = capture(site); // Capture field access
2082
2083 // don't allow T.class T[].class, etc
2084 if (skind == TYP) {
2085 Type elt = site;
2086 while (elt.tag == ARRAY)
2087 elt = ((ArrayType)elt).elemtype;
2088 if (elt.tag == TYPEVAR) {
2089 log.error(tree.pos(), "type.var.cant.be.deref");
2090 result = types.createErrorType(tree.type);
2091 return;
2092 }
2093 }
2094
2095 // If qualifier symbol is a type or `super', assert `selectSuper'
2096 // for the selection. This is relevant for determining whether
2097 // protected symbols are accessible.
2098 Symbol sitesym = TreeInfo.symbol(tree.selected);
2099 boolean selectSuperPrev = env.info.selectSuper;
2100 env.info.selectSuper =
2101 sitesym != null &&
2102 sitesym.name == names._super;
2103
2104 // If selected expression is polymorphic, strip
2105 // type parameters and remember in env.info.tvars, so that
2106 // they can be added later (in Attr.checkId and Infer.instantiateMethod).
2107 if (tree.selected.type.tag == FORALL) {
2108 ForAll pstype = (ForAll)tree.selected.type;
2109 env.info.tvars = pstype.tvars;
2110 site = tree.selected.type = pstype.qtype;
2111 }
2112
2113 // Determine the symbol represented by the selection.
2114 env.info.varArgs = false;
2115 Symbol sym = selectSym(tree, site, env, pt, pkind);
2116 if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) {
2117 site = capture(site);
2118 sym = selectSym(tree, site, env, pt, pkind);
2119 }
2120 boolean varArgs = env.info.varArgs;
2121 tree.sym = sym;
2122
2123 if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) {
2124 while (site.tag == TYPEVAR) site = site.getUpperBound();
2125 site = capture(site);
2126 }
2127
2128 // If that symbol is a variable, ...
2129 if (sym.kind == VAR) {
2130 VarSymbol v = (VarSymbol)sym;
2131
2132 // ..., evaluate its initializer, if it has one, and check for
2133 // illegal forward reference.
2134 checkInit(tree, env, v, true);
2135
2136 // If we are expecting a variable (as opposed to a value), check
2137 // that the variable is assignable in the current environment.
2138 if (pkind == VAR)
2139 checkAssignable(tree.pos(), v, tree.selected, env);
2140 }
2141
2142 // Disallow selecting a type from an expression
2143 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
2144 tree.type = check(tree.selected, pt,
2145 sitesym == null ? VAL : sitesym.kind, TYP|PCK, pt);
2146 }
2147
2148 if (isType(sitesym)) {
2149 if (sym.name == names._this) {
2150 // If `C' is the currently compiled class, check that
2151 // C.this' does not appear in a call to a super(...)
2152 if (env.info.isSelfCall &&
2153 site.tsym == env.enclClass.sym) {
2154 chk.earlyRefError(tree.pos(), sym);
2155 }
2156 } else {
2157 // Check if type-qualified fields or methods are static (JLS)
2158 if ((sym.flags() & STATIC) == 0 &&
2159 sym.name != names._super &&
2160 (sym.kind == VAR || sym.kind == MTH)) {
2161 rs.access(rs.new StaticError(sym),
2162 tree.pos(), site, sym.name, true);
2163 }
2164 }
2165 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
2166 // If the qualified item is not a type and the selected item is static, report
2167 // a warning. Make allowance for the class of an array type e.g. Object[].class)
2168 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
2169 }
2170
2171 // If we are selecting an instance member via a `super', ...
2172 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
2173
2174 // Check that super-qualified symbols are not abstract (JLS)
2175 rs.checkNonAbstract(tree.pos(), sym);
2176
2177 if (site.isRaw()) {
2178 // Determine argument types for site.
2179 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
2180 if (site1 != null) site = site1;
2181 }
2182 }
2183
2184 env.info.selectSuper = selectSuperPrev;
2185 result = checkId(tree, site, sym, env, pkind, pt, varArgs);
2186 env.info.tvars = List.nil();
2187 }
2188 //where
2189 /** Determine symbol referenced by a Select expression,
2190 *
2191 * @param tree The select tree.
2192 * @param site The type of the selected expression,
2193 * @param env The current environment.
2194 * @param pt The current prototype.
2195 * @param pkind The expected kind(s) of the Select expression.
2196 */
2197 private Symbol selectSym(JCFieldAccess tree,
2198 Type site,
2199 Env<AttrContext> env,
2200 Type pt,
2201 int pkind) {
2202 DiagnosticPosition pos = tree.pos();
2203 Name name = tree.name;
2204
2205 switch (site.tag) {
2206 case PACKAGE:
2207 return rs.access(
2208 rs.findIdentInPackage(env, site.tsym, name, pkind),
2209 pos, site, name, true);
2210 case ARRAY:
2211 case CLASS:
2212 if (pt.tag == METHOD || pt.tag == FORALL) {
2213 return rs.resolveQualifiedMethod(
2214 pos, env, site, name, pt.getParameterTypes(), pt.getTypeArguments());
2215 } else if (name == names._this || name == names._super) {
2216 return rs.resolveSelf(pos, env, site.tsym, name);
2217 } else if (name == names._class) {
2218 // In this case, we have already made sure in
2219 // visitSelect that qualifier expression is a type.
2220 Type t = syms.classType;
2221 List<Type> typeargs = allowGenerics
2222 ? List.of(types.erasure(site))
2223 : List.<Type>nil();
2224 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
2225 return new VarSymbol(
2226 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2227 } else {
2228 // We are seeing a plain identifier as selector.
2229 Symbol sym = rs.findIdentInType(env, site, name, pkind);
2230 if ((pkind & ERRONEOUS) == 0)
2231 sym = rs.access(sym, pos, site, name, true);
2232 return sym;
2233 }
2234 case WILDCARD:
2235 throw new AssertionError(tree);
2236 case TYPEVAR:
2237 // Normally, site.getUpperBound() shouldn't be null.
2238 // It should only happen during memberEnter/attribBase
2239 // when determining the super type which *must* be
2240 // done before attributing the type variables. In
2241 // other words, we are seeing this illegal program:
2242 // class B<T> extends A<T.foo> {}
2243 Symbol sym = (site.getUpperBound() != null)
2244 ? selectSym(tree, capture(site.getUpperBound()), env, pt, pkind)
2245 : null;
2246 if (sym == null) {
2247 log.error(pos, "type.var.cant.be.deref");
2248 return syms.errSymbol;
2249 } else {
2250 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
2251 rs.new AccessError(env, site, sym) :
2252 sym;
2253 rs.access(sym2, pos, site, name, true);
2254 return sym;
2255 }
2256 case ERROR:
2257 // preserve identifier names through errors
2258 return types.createErrorType(name, site.tsym, site).tsym;
2259 default:
2260 // The qualifier expression is of a primitive type -- only
2261 // .class is allowed for these.
2262 if (name == names._class) {
2263 // In this case, we have already made sure in Select that
2264 // qualifier expression is a type.
2265 Type t = syms.classType;
2266 Type arg = types.boxedClass(site).type;
2267 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
2268 return new VarSymbol(
2269 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2270 } else {
2271 log.error(pos, "cant.deref", site);
2272 return syms.errSymbol;
2273 }
2274 }
2275 }
2276
2277 /** Determine type of identifier or select expression and check that
2278 * (1) the referenced symbol is not deprecated
2279 * (2) the symbol's type is safe (@see checkSafe)
2280 * (3) if symbol is a variable, check that its type and kind are
2281 * compatible with the prototype and protokind.
2282 * (4) if symbol is an instance field of a raw type,
2283 * which is being assigned to, issue an unchecked warning if its
2284 * type changes under erasure.
2285 * (5) if symbol is an instance method of a raw type, issue an
2286 * unchecked warning if its argument types change under erasure.
2287 * If checks succeed:
2288 * If symbol is a constant, return its constant type
2289 * else if symbol is a method, return its result type
2290 * otherwise return its type.
2291 * Otherwise return errType.
2292 *
2293 * @param tree The syntax tree representing the identifier
2294 * @param site If this is a select, the type of the selected
2295 * expression, otherwise the type of the current class.
2296 * @param sym The symbol representing the identifier.
2297 * @param env The current environment.
2298 * @param pkind The set of expected kinds.
2299 * @param pt The expected type.
2300 */
2301 Type checkId(JCTree tree,
2302 Type site,
2303 Symbol sym,
2304 Env<AttrContext> env,
2305 int pkind,
2306 Type pt,
2307 boolean useVarargs) {
2308 if (pt.isErroneous()) return types.createErrorType(site);
2309 Type owntype; // The computed type of this identifier occurrence.
2310 switch (sym.kind) {
2311 case TYP:
2312 // For types, the computed type equals the symbol's type,
2313 // except for two situations:
2314 owntype = sym.type;
2315 if (owntype.tag == CLASS) {
2316 Type ownOuter = owntype.getEnclosingType();
2317
2318 // (a) If the symbol's type is parameterized, erase it
2319 // because no type parameters were given.
2320 // We recover generic outer type later in visitTypeApply.
2321 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
2322 owntype = types.erasure(owntype);
2323 }
2324
2325 // (b) If the symbol's type is an inner class, then
2326 // we have to interpret its outer type as a superclass
2327 // of the site type. Example:
2328 //
2329 // class Tree<A> { class Visitor { ... } }
2330 // class PointTree extends Tree<Point> { ... }
2331 // ...PointTree.Visitor...
2332 //
2333 // Then the type of the last expression above is
2334 // Tree<Point>.Visitor.
2335 else if (ownOuter.tag == CLASS && site != ownOuter) {
2336 Type normOuter = site;
2337 if (normOuter.tag == CLASS)
2338 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
2339 if (normOuter == null) // perhaps from an import
2340 normOuter = types.erasure(ownOuter);
2341 if (normOuter != ownOuter)
2342 owntype = new ClassType(
2343 normOuter, List.<Type>nil(), owntype.tsym);
2344 }
2345 }
2346 break;
2347 case VAR:
2348 VarSymbol v = (VarSymbol)sym;
2349 // Test (4): if symbol is an instance field of a raw type,
2350 // which is being assigned to, issue an unchecked warning if
2351 // its type changes under erasure.
2352 if (allowGenerics &&
2353 pkind == VAR &&
2354 v.owner.kind == TYP &&
2355 (v.flags() & STATIC) == 0 &&
2356 (site.tag == CLASS || site.tag == TYPEVAR)) {
2357 Type s = types.asOuterSuper(site, v.owner);
2358 if (s != null &&
2359 s.isRaw() &&
2360 !types.isSameType(v.type, v.erasure(types))) {
2361 chk.warnUnchecked(tree.pos(),
2362 "unchecked.assign.to.var",
2363 v, s);
2364 }
2365 }
2366 // The computed type of a variable is the type of the
2367 // variable symbol, taken as a member of the site type.
2368 owntype = (sym.owner.kind == TYP &&
2369 sym.name != names._this && sym.name != names._super)
2370 ? types.memberType(site, sym)
2371 : sym.type;
2372
2373 if (env.info.tvars.nonEmpty()) {
2374 Type owntype1 = new ForAll(env.info.tvars, owntype);
2375 for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail)
2376 if (!owntype.contains(l.head)) {
2377 log.error(tree.pos(), "undetermined.type", owntype1);
2378 owntype1 = types.createErrorType(owntype1);
2379 }
2380 owntype = owntype1;
2381 }
2382
2383 // If the variable is a constant, record constant value in
2384 // computed type.
2385 if (v.getConstValue() != null && isStaticReference(tree))
2386 owntype = owntype.constType(v.getConstValue());
2387
2388 if (pkind == VAL) {
2389 owntype = capture(owntype); // capture "names as expressions"
2390 }
2391 break;
2392 case MTH: {
2393 JCMethodInvocation app = (JCMethodInvocation)env.tree;
2394 owntype = checkMethod(site, sym, env, app.args,
2395 pt.getParameterTypes(), pt.getTypeArguments(),
2396 env.info.varArgs);
2397 break;
2398 }
2399 case PCK: case ERR:
2400 owntype = sym.type;
2401 break;
2402 default:
2403 throw new AssertionError("unexpected kind: " + sym.kind +
2404 " in tree " + tree);
2405 }
2406
2407 // Test (1): emit a `deprecation' warning if symbol is deprecated.
2408 // (for constructors, the error was given when the constructor was
2409 // resolved)
2410 if (sym.name != names.init &&
2411 (sym.flags() & DEPRECATED) != 0 &&
2412 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
2413 sym.outermostClass() != env.info.scope.owner.outermostClass())
2414 chk.warnDeprecated(tree.pos(), sym);
2415
2416 if ((sym.flags() & PROPRIETARY) != 0) {
2417 if (enableSunApiLintControl)
2418 chk.warnSunApi(tree.pos(), "sun.proprietary", sym);
2419 else
2420 log.strictWarning(tree.pos(), "sun.proprietary", sym);
2421 }
2422
2423 // Test (3): if symbol is a variable, check that its type and
2424 // kind are compatible with the prototype and protokind.
2425 return check(tree, owntype, sym.kind, pkind, pt);
2426 }
2427
2428 /** Check that variable is initialized and evaluate the variable's
2429 * initializer, if not yet done. Also check that variable is not
2430 * referenced before it is defined.
2431 * @param tree The tree making up the variable reference.
2432 * @param env The current environment.
2433 * @param v The variable's symbol.
2434 */
2435 private void checkInit(JCTree tree,
2436 Env<AttrContext> env,
2437 VarSymbol v,
2438 boolean onlyWarning) {
2439 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
2440 // tree.pos + " " + v.pos + " " +
2441 // Resolve.isStatic(env));//DEBUG
2442
2443 // A forward reference is diagnosed if the declaration position
2444 // of the variable is greater than the current tree position
2445 // and the tree and variable definition occur in the same class
2446 // definition. Note that writes don't count as references.
2447 // This check applies only to class and instance
2448 // variables. Local variables follow different scope rules,
2449 // and are subject to definite assignment checking.
2450 if ((env.info.enclVar == v || v.pos > tree.pos) &&
2451 v.owner.kind == TYP &&
2452 canOwnInitializer(env.info.scope.owner) &&
2453 v.owner == env.info.scope.owner.enclClass() &&
2454 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
2455 (env.tree.getTag() != JCTree.ASSIGN ||
2456 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
2457 String suffix = (env.info.enclVar == v) ?
2458 "self.ref" : "forward.ref";
2459 if (!onlyWarning || isStaticEnumField(v)) {
2460 log.error(tree.pos(), "illegal." + suffix);
2461 } else if (useBeforeDeclarationWarning) {
2462 log.warning(tree.pos(), suffix, v);
2463 }
2464 }
2465
2466 v.getConstValue(); // ensure initializer is evaluated
2467
2468 checkEnumInitializer(tree, env, v);
2469 }
2470
2471 /**
2472 * Check for illegal references to static members of enum. In
2473 * an enum type, constructors and initializers may not
2474 * reference its static members unless they are constant.
2475 *
2476 * @param tree The tree making up the variable reference.
2477 * @param env The current environment.
2478 * @param v The variable's symbol.
2479 * @see JLS 3rd Ed. (8.9 Enums)
2480 */
2481 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
2482 // JLS 3rd Ed.:
2483 //
2484 // "It is a compile-time error to reference a static field
2485 // of an enum type that is not a compile-time constant
2486 // (15.28) from constructors, instance initializer blocks,
2487 // or instance variable initializer expressions of that
2488 // type. It is a compile-time error for the constructors,
2489 // instance initializer blocks, or instance variable
2490 // initializer expressions of an enum constant e to refer
2491 // to itself or to an enum constant of the same type that
2492 // is declared to the right of e."
2493 if (isStaticEnumField(v)) {
2494 ClassSymbol enclClass = env.info.scope.owner.enclClass();
2495
2496 if (enclClass == null || enclClass.owner == null)
2497 return;
2498
2499 // See if the enclosing class is the enum (or a
2500 // subclass thereof) declaring v. If not, this
2501 // reference is OK.
2502 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
2503 return;
2504
2505 // If the reference isn't from an initializer, then
2506 // the reference is OK.
2507 if (!Resolve.isInitializer(env))
2508 return;
2509
2510 log.error(tree.pos(), "illegal.enum.static.ref");
2511 }
2512 }
2513
2514 /** Is the given symbol a static, non-constant field of an Enum?
2515 * Note: enum literals should not be regarded as such
2516 */
2517 private boolean isStaticEnumField(VarSymbol v) {
2518 return Flags.isEnum(v.owner) &&
2519 Flags.isStatic(v) &&
2520 !Flags.isConstant(v) &&
2521 v.name != names._class;
2522 }
2523
2524 /** Can the given symbol be the owner of code which forms part
2525 * if class initialization? This is the case if the symbol is
2526 * a type or field, or if the symbol is the synthetic method.
2527 * owning a block.
2528 */
2529 private boolean canOwnInitializer(Symbol sym) {
2530 return
2531 (sym.kind & (VAR | TYP)) != 0 ||
2532 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
2533 }
2534
2535 Warner noteWarner = new Warner();
2536
2537 /**
2538 * Check that method arguments conform to its instantation.
2539 **/
2540 public Type checkMethod(Type site,
2541 Symbol sym,
2542 Env<AttrContext> env,
2543 final List<JCExpression> argtrees,
2544 List<Type> argtypes,
2545 List<Type> typeargtypes,
2546 boolean useVarargs) {
2547 // Test (5): if symbol is an instance method of a raw type, issue
2548 // an unchecked warning if its argument types change under erasure.
2549 if (allowGenerics &&
2550 (sym.flags() & STATIC) == 0 &&
2551 (site.tag == CLASS || site.tag == TYPEVAR)) {
2552 Type s = types.asOuterSuper(site, sym.owner);
2553 if (s != null && s.isRaw() &&
2554 !types.isSameTypes(sym.type.getParameterTypes(),
2555 sym.erasure(types).getParameterTypes())) {
2556 chk.warnUnchecked(env.tree.pos(),
2557 "unchecked.call.mbr.of.raw.type",
2558 sym, s);
2559 }
2560 }
2561
2562 // Compute the identifier's instantiated type.
2563 // For methods, we need to compute the instance type by
2564 // Resolve.instantiate from the symbol's type as well as
2565 // any type arguments and value arguments.
2566 noteWarner.warned = false;
2567 Type owntype = rs.instantiate(env,
2568 site,
2569 sym,
2570 argtypes,
2571 typeargtypes,
2572 true,
2573 useVarargs,
2574 noteWarner);
2575 boolean warned = noteWarner.warned;
2576
2577 // If this fails, something went wrong; we should not have
2578 // found the identifier in the first place.
2579 if (owntype == null) {
2580 if (!pt.isErroneous())
2581 log.error(env.tree.pos(),
2582 "internal.error.cant.instantiate",
2583 sym, site,
2584 Type.toString(pt.getParameterTypes()));
2585 owntype = types.createErrorType(site);
2586 } else {
2587 // System.out.println("call : " + env.tree);
2588 // System.out.println("method : " + owntype);
2589 // System.out.println("actuals: " + argtypes);
2590 List<Type> formals = owntype.getParameterTypes();
2591 Type last = useVarargs ? formals.last() : null;
2592 if (sym.name==names.init &&
2593 sym.owner == syms.enumSym)
2594 formals = formals.tail.tail;
2595 List<JCExpression> args = argtrees;
2596 while (formals.head != last) {
2597 JCTree arg = args.head;
2598 Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head);
2599 assertConvertible(arg, arg.type, formals.head, warn);
2600 warned |= warn.warned;
2601 args = args.tail;
2602 formals = formals.tail;
2603 }
2604 if (useVarargs) {
2605 Type varArg = types.elemtype(last);
2606 while (args.tail != null) {
2607 JCTree arg = args.head;
2608 Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg);
2609 assertConvertible(arg, arg.type, varArg, warn);
2610 warned |= warn.warned;
2611 args = args.tail;
2612 }
2613 } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) {
2614 // non-varargs call to varargs method
2615 Type varParam = owntype.getParameterTypes().last();
2616 Type lastArg = argtypes.last();
2617 if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) &&
2618 !types.isSameType(types.erasure(varParam), types.erasure(lastArg)))
2619 log.warning(argtrees.last().pos(), "inexact.non-varargs.call",
2620 types.elemtype(varParam),
2621 varParam);
2622 }
2623
2624 if (warned && sym.type.tag == FORALL) {
2625 chk.warnUnchecked(env.tree.pos(),
2626 "unchecked.meth.invocation.applied",
2627 kindName(sym),
2628 sym.name,
2629 rs.methodArguments(sym.type.getParameterTypes()),
2630 rs.methodArguments(argtypes),
2631 kindName(sym.location()),
2632 sym.location());
2633 owntype = new MethodType(owntype.getParameterTypes(),
2634 types.erasure(owntype.getReturnType()),
2635 owntype.getThrownTypes(),
2636 syms.methodClass);
2637 }
2638 if (useVarargs) {
2639 JCTree tree = env.tree;
2640 Type argtype = owntype.getParameterTypes().last();
2641 if (owntype.getReturnType().tag != FORALL || warned) {
2642 chk.checkVararg(env.tree.pos(), owntype.getParameterTypes(), sym, env);
2643 }
2644 Type elemtype = types.elemtype(argtype);
2645 switch (tree.getTag()) {
2646 case JCTree.APPLY:
2647 ((JCMethodInvocation) tree).varargsElement = elemtype;
2648 break;
2649 case JCTree.NEWCLASS:
2650 ((JCNewClass) tree).varargsElement = elemtype;
2651 break;
2652 default:
2653 throw new AssertionError(""+tree);
2654 }
2655 }
2656 }
2657 return owntype;
2658 }
2659
2660 private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) {
2661 if (types.isConvertible(actual, formal, warn))
2662 return;
2663
2664 if (formal.isCompound()
2665 && types.isSubtype(actual, types.supertype(formal))
2666 && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn))
2667 return;
2668
2669 if (false) {
2670 // TODO: make assertConvertible work
2671 chk.typeError(tree.pos(), diags.fragment("incompatible.types"), actual, formal);
2672 throw new AssertionError("Tree: " + tree
2673 + " actual:" + actual
2674 + " formal: " + formal);
2675 }
2676 }
2677
2678 public void visitLiteral(JCLiteral tree) {
2679 result = check(
2680 tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt);
2681 }
2682 //where
2683 /** Return the type of a literal with given type tag.
2684 */
2685 Type litType(int tag) {
2686 return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag];
2687 }
2688
2689 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
2690 result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt);
2691 }
2692
2693 public void visitTypeArray(JCArrayTypeTree tree) {
2694 Type etype = attribType(tree.elemtype, env);
2695 Type type = new ArrayType(etype, syms.arrayClass);
2696 result = check(tree, type, TYP, pkind, pt);
2697 }
2698
2699 /** Visitor method for parameterized types.
2700 * Bound checking is left until later, since types are attributed
2701 * before supertype structure is completely known
2702 */
2703 public void visitTypeApply(JCTypeApply tree) {
2704 Type owntype = types.createErrorType(tree.type);
2705
2706 // Attribute functor part of application and make sure it's a class.
2707 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
2708
2709 // Attribute type parameters
2710 List<Type> actuals = attribTypes(tree.arguments, env);
2711
2712 if (clazztype.tag == CLASS) {
2713 List<Type> formals = clazztype.tsym.type.getTypeArguments();
2714
2715 if (actuals.length() == formals.length() || actuals.length() == 0) {
2716 List<Type> a = actuals;
2717 List<Type> f = formals;
2718 while (a.nonEmpty()) {
2719 a.head = a.head.withTypeVar(f.head);
2720 a = a.tail;
2721 f = f.tail;
2722 }
2723 // Compute the proper generic outer
2724 Type clazzOuter = clazztype.getEnclosingType();
2725 if (clazzOuter.tag == CLASS) {
2726 Type site;
2727 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
2728 if (clazz.getTag() == JCTree.IDENT) {
2729 site = env.enclClass.sym.type;
2730 } else if (clazz.getTag() == JCTree.SELECT) {
2731 site = ((JCFieldAccess) clazz).selected.type;
2732 } else throw new AssertionError(""+tree);
2733 if (clazzOuter.tag == CLASS && site != clazzOuter) {
2734 if (site.tag == CLASS)
2735 site = types.asOuterSuper(site, clazzOuter.tsym);
2736 if (site == null)
2737 site = types.erasure(clazzOuter);
2738 clazzOuter = site;
2739 }
2740 }
2741 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
2742 } else {
2743 if (formals.length() != 0) {
2744 log.error(tree.pos(), "wrong.number.type.args",
2745 Integer.toString(formals.length()));
2746 } else {
2747 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
2748 }
2749 owntype = types.createErrorType(tree.type);
2750 }
2751 }
2752 result = check(tree, owntype, TYP, pkind, pt);
2753 }
2754
2755 public void visitTypeDisjoint(JCTypeDisjoint tree) {
2756 List<Type> componentTypes = attribTypes(tree.components, env);
2757 tree.type = result = check(tree, types.lub(componentTypes), TYP, pkind, pt);
2758 }
2759
2760 public void visitTypeParameter(JCTypeParameter tree) {
2761 TypeVar a = (TypeVar)tree.type;
2762 Set<Type> boundSet = new HashSet<Type>();
2763 if (a.bound.isErroneous())
2764 return;
2765 List<Type> bs = types.getBounds(a);
2766 if (tree.bounds.nonEmpty()) {
2767 // accept class or interface or typevar as first bound.
2768 Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false);
2769 boundSet.add(types.erasure(b));
2770 if (b.isErroneous()) {
2771 a.bound = b;
2772 }
2773 else if (b.tag == TYPEVAR) {
2774 // if first bound was a typevar, do not accept further bounds.
2775 if (tree.bounds.tail.nonEmpty()) {
2776 log.error(tree.bounds.tail.head.pos(),
2777 "type.var.may.not.be.followed.by.other.bounds");
2778 log.unrecoverableError = true;
2779 tree.bounds = List.of(tree.bounds.head);
2780 a.bound = bs.head;
2781 }
2782 } else {
2783 // if first bound was a class or interface, accept only interfaces
2784 // as further bounds.
2785 for (JCExpression bound : tree.bounds.tail) {
2786 bs = bs.tail;
2787 Type i = checkBase(bs.head, bound, env, false, true, false);
2788 if (i.isErroneous())
2789 a.bound = i;
2790 else if (i.tag == CLASS)
2791 chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet);
2792 }
2793 }
2794 }
2795 bs = types.getBounds(a);
2796
2797 // in case of multiple bounds ...
2798 if (bs.length() > 1) {
2799 // ... the variable's bound is a class type flagged COMPOUND
2800 // (see comment for TypeVar.bound).
2801 // In this case, generate a class tree that represents the
2802 // bound class, ...
2803 JCTree extending;
2804 List<JCExpression> implementing;
2805 if ((bs.head.tsym.flags() & INTERFACE) == 0) {
2806 extending = tree.bounds.head;
2807 implementing = tree.bounds.tail;
2808 } else {
2809 extending = null;
2810 implementing = tree.bounds;
2811 }
2812 JCClassDecl cd = make.at(tree.pos).ClassDef(
2813 make.Modifiers(PUBLIC | ABSTRACT),
2814 tree.name, List.<JCTypeParameter>nil(),
2815 extending, implementing, List.<JCTree>nil());
2816
2817 ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym;
2818 assert (c.flags() & COMPOUND) != 0;
2819 cd.sym = c;
2820 c.sourcefile = env.toplevel.sourcefile;
2821
2822 // ... and attribute the bound class
2823 c.flags_field |= UNATTRIBUTED;
2824 Env<AttrContext> cenv = enter.classEnv(cd, env);
2825 enter.typeEnvs.put(c, cenv);
2826 }
2827 }
2828
2829
2830 public void visitWildcard(JCWildcard tree) {
2831 //- System.err.println("visitWildcard("+tree+");");//DEBUG
2832 Type type = (tree.kind.kind == BoundKind.UNBOUND)
2833 ? syms.objectType
2834 : attribType(tree.inner, env);
2835 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
2836 tree.kind.kind,
2837 syms.boundClass),
2838 TYP, pkind, pt);
2839 }
2840
2841 public void visitAnnotation(JCAnnotation tree) {
2842 log.error(tree.pos(), "annotation.not.valid.for.type", pt);
2843 result = tree.type = syms.errType;
2844 }
2845
2846 public void visitAnnotatedType(JCAnnotatedType tree) {
2847 result = tree.type = attribType(tree.getUnderlyingType(), env);
2848 }
2849
2850 public void visitErroneous(JCErroneous tree) {
2851 if (tree.errs != null)
2852 for (JCTree err : tree.errs)
2853 attribTree(err, env, ERR, pt);
2854 result = tree.type = syms.errType;
2855 }
2856
2857 /** Default visitor method for all other trees.
2858 */
2859 public void visitTree(JCTree tree) {
2860 throw new AssertionError();
2861 }
2862
2863 /** Main method: attribute class definition associated with given class symbol.
2864 * reporting completion failures at the given position.
2865 * @param pos The source position at which completion errors are to be
2866 * reported.
2867 * @param c The class symbol whose definition will be attributed.
2868 */
2869 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
2870 try {
2871 annotate.flush();
2872 attribClass(c);
2873 } catch (CompletionFailure ex) {
2874 chk.completionError(pos, ex);
2875 }
2876 }
2877
2878 /** Attribute class definition associated with given class symbol.
2879 * @param c The class symbol whose definition will be attributed.
2880 */
2881 void attribClass(ClassSymbol c) throws CompletionFailure {
2882 if (c.type.tag == ERROR) return;
2883
2884 // Check for cycles in the inheritance graph, which can arise from
2885 // ill-formed class files.
2886 chk.checkNonCyclic(null, c.type);
2887
2888 Type st = types.supertype(c.type);
2889 if ((c.flags_field & Flags.COMPOUND) == 0) {
2890 // First, attribute superclass.
2891 if (st.tag == CLASS)
2892 attribClass((ClassSymbol)st.tsym);
2893
2894 // Next attribute owner, if it is a class.
2895 if (c.owner.kind == TYP && c.owner.type.tag == CLASS)
2896 attribClass((ClassSymbol)c.owner);
2897 }
2898
2899 // The previous operations might have attributed the current class
2900 // if there was a cycle. So we test first whether the class is still
2901 // UNATTRIBUTED.
2902 if ((c.flags_field & UNATTRIBUTED) != 0) {
2903 c.flags_field &= ~UNATTRIBUTED;
2904
2905 // Get environment current at the point of class definition.
2906 Env<AttrContext> env = enter.typeEnvs.get(c);
2907
2908 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
2909 // because the annotations were not available at the time the env was created. Therefore,
2910 // we look up the environment chain for the first enclosing environment for which the
2911 // lint value is set. Typically, this is the parent env, but might be further if there
2912 // are any envs created as a result of TypeParameter nodes.
2913 Env<AttrContext> lintEnv = env;
2914 while (lintEnv.info.lint == null)
2915 lintEnv = lintEnv.next;
2916
2917 // Having found the enclosing lint value, we can initialize the lint value for this class
2918 env.info.lint = lintEnv.info.lint.augment(c.attributes_field, c.flags());
2919
2920 Lint prevLint = chk.setLint(env.info.lint);
2921 JavaFileObject prev = log.useSource(c.sourcefile);
2922
2923 try {
2924 // java.lang.Enum may not be subclassed by a non-enum
2925 if (st.tsym == syms.enumSym &&
2926 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
2927 log.error(env.tree.pos(), "enum.no.subclassing");
2928
2929 // Enums may not be extended by source-level classes
2930 if (st.tsym != null &&
2931 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
2932 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
2933 !target.compilerBootstrap(c)) {
2934 log.error(env.tree.pos(), "enum.types.not.extensible");
2935 }
2936 attribClassBody(env, c);
2937
2938 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
2939 } finally {
2940 log.useSource(prev);
2941 chk.setLint(prevLint);
2942 }
2943
2944 }
2945 }
2946
2947 public void visitImport(JCImport tree) {
2948 // nothing to do
2949 }
2950
2951 /** Finish the attribution of a class. */
2952 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
2953 JCClassDecl tree = (JCClassDecl)env.tree;
2954 assert c == tree.sym;
2955
2956 // Validate annotations
2957 chk.validateAnnotations(tree.mods.annotations, c);
2958
2959 // Validate type parameters, supertype and interfaces.
2960 attribBounds(tree.typarams);
2961 if (!c.isAnonymous()) {
2962 //already checked if anonymous
2963 chk.validate(tree.typarams, env);
2964 chk.validate(tree.extending, env);
2965 chk.validate(tree.implementing, env);
2966 }
2967
2968 // If this is a non-abstract class, check that it has no abstract
2969 // methods or unimplemented methods of an implemented interface.
2970 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
2971 if (!relax)
2972 chk.checkAllDefined(tree.pos(), c);
2973 }
2974
2975 if ((c.flags() & ANNOTATION) != 0) {
2976 if (tree.implementing.nonEmpty())
2977 log.error(tree.implementing.head.pos(),
2978 "cant.extend.intf.annotation");
2979 if (tree.typarams.nonEmpty())
2980 log.error(tree.typarams.head.pos(),
2981 "intf.annotation.cant.have.type.params");
2982 } else {
2983 // Check that all extended classes and interfaces
2984 // are compatible (i.e. no two define methods with same arguments
2985 // yet different return types). (JLS 8.4.6.3)
2986 chk.checkCompatibleSupertypes(tree.pos(), c.type);
2987 }
2988
2989 // Check that class does not import the same parameterized interface
2990 // with two different argument lists.
2991 chk.checkClassBounds(tree.pos(), c.type);
2992
2993 tree.type = c.type;
2994
2995 boolean assertsEnabled = false;
2996 assert assertsEnabled = true;
2997 if (assertsEnabled) {
2998 for (List<JCTypeParameter> l = tree.typarams;
2999 l.nonEmpty(); l = l.tail)
3000 assert env.info.scope.lookup(l.head.name).scope != null;
3001 }
3002
3003 // Check that a generic class doesn't extend Throwable
3004 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
3005 log.error(tree.extending.pos(), "generic.throwable");
3006
3007 // Check that all methods which implement some
3008 // method conform to the method they implement.
3009 chk.checkImplementations(tree);
3010
3011 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
3012 // Attribute declaration
3013 attribStat(l.head, env);
3014 // Check that declarations in inner classes are not static (JLS 8.1.2)
3015 // Make an exception for static constants.
3016 if (c.owner.kind != PCK &&
3017 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
3018 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
3019 Symbol sym = null;
3020 if (l.head.getTag() == JCTree.VARDEF) sym = ((JCVariableDecl) l.head).sym;
3021 if (sym == null ||
3022 sym.kind != VAR ||
3023 ((VarSymbol) sym).getConstValue() == null)
3024 log.error(l.head.pos(), "icls.cant.have.static.decl");
3025 }
3026 }
3027
3028 // Check for cycles among non-initial constructors.
3029 chk.checkCyclicConstructors(tree);
3030
3031 // Check for cycles among annotation elements.
3032 chk.checkNonCyclicElements(tree);
3033
3034 // Check for proper use of serialVersionUID
3035 if (env.info.lint.isEnabled(Lint.LintCategory.SERIAL) &&
3036 isSerializable(c) &&
3037 (c.flags() & Flags.ENUM) == 0 &&
3038 (c.flags() & ABSTRACT) == 0) {
3039 checkSerialVersionUID(tree, c);
3040 }
3041
3042 // Check type annotations applicability rules
3043 validateTypeAnnotations(tree);
3044 }
3045 // where
3046 /** check if a class is a subtype of Serializable, if that is available. */
3047 private boolean isSerializable(ClassSymbol c) {
3048 try {
3049 syms.serializableType.complete();
3050 }
3051 catch (CompletionFailure e) {
3052 return false;
3053 }
3054 return types.isSubtype(c.type, syms.serializableType);
3055 }
3056
3057 /** Check that an appropriate serialVersionUID member is defined. */
3058 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
3059
3060 // check for presence of serialVersionUID
3061 Scope.Entry e = c.members().lookup(names.serialVersionUID);
3062 while (e.scope != null && e.sym.kind != VAR) e = e.next();
3063 if (e.scope == null) {
3064 log.warning(tree.pos(), "missing.SVUID", c);
3065 return;
3066 }
3067
3068 // check that it is static final
3069 VarSymbol svuid = (VarSymbol)e.sym;
3070 if ((svuid.flags() & (STATIC | FINAL)) !=
3071 (STATIC | FINAL))
3072 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
3073
3074 // check that it is long
3075 else if (svuid.type.tag != TypeTags.LONG)
3076 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
3077
3078 // check constant
3079 else if (svuid.getConstValue() == null)
3080 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
3081 }
3082
3083 private Type capture(Type type) {
3084 return types.capture(type);
3085 }
3086
3087 private void validateTypeAnnotations(JCTree tree) {
3088 tree.accept(typeAnnotationsValidator);
3089 }
3090 //where
3091 private final JCTree.Visitor typeAnnotationsValidator =
3092 new TreeScanner() {
3093 public void visitAnnotation(JCAnnotation tree) {
3094 if (tree instanceof JCTypeAnnotation) {
3095 chk.validateTypeAnnotation((JCTypeAnnotation)tree, false);
3096 }
3097 super.visitAnnotation(tree);
3098 }
3099 public void visitTypeParameter(JCTypeParameter tree) {
3100 chk.validateTypeAnnotations(tree.annotations, true);
3101 // don't call super. skip type annotations
3102 scan(tree.bounds);
3103 }
3104 public void visitMethodDef(JCMethodDecl tree) {
3105 // need to check static methods
3106 if ((tree.sym.flags() & Flags.STATIC) != 0) {
3107 for (JCTypeAnnotation a : tree.receiverAnnotations) {
3108 if (chk.isTypeAnnotation(a, false))
3109 log.error(a.pos(), "annotation.type.not.applicable");
3110 }
3111 }
3112 super.visitMethodDef(tree);
3113 }
3114 };
3115 }