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