Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Attr.java@2881b376a689
src/share/classes/com/sun/tools/javac/comp/Attr.java
Wed, 19 May 2010 16:42:37 +0100
- author
- mcimadamore
- date
- Wed, 19 May 2010 16:42:37 +0100
- changeset 562
- 2881b376a689
- parent 550
- a6f2911a7c55
- child 567
- 593a59e40bdb
- permissions
- -rw-r--r--
6946618: sqe test fails: javac/generics/NewOnTypeParm in pit jdk7 b91 in all platforms.
Summary: Bad cast to ClassType in the new diamond implementation fails if the target type of the instance creation expression is a type-variable
Reviewed-by: jjg
1 /*
2 * Copyright 1999-2009 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
26 package com.sun.tools.javac.comp;
28 import java.util.*;
29 import java.util.Set;
30 import javax.lang.model.element.ElementKind;
31 import javax.tools.JavaFileObject;
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;
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.*;
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;
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.*;
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 API supported by Sun Microsystems. If
63 * 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>();
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;
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 }
93 protected Attr(Context context) {
94 context.put(attrKey, this);
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);
111 Options options = Options.instance(context);
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 }
129 /** Switch: relax some constraints for retrofit mode.
130 */
131 boolean relax;
133 /** Switch: support generics?
134 */
135 boolean allowGenerics;
137 /** Switch: allow variable-arity methods.
138 */
139 boolean allowVarargs;
141 /** Switch: support enums?
142 */
143 boolean allowEnums;
145 /** Switch: support boxing and unboxing?
146 */
147 boolean allowBoxing;
149 /** Switch: support covariant result types?
150 */
151 boolean allowCovariantReturns;
153 /** Switch: allow references to surrounding object from anonymous
154 * objects during constructor call?
155 */
156 boolean allowAnonOuterThis;
158 /** Switch: allow invokedynamic syntax
159 */
160 boolean allowInvokedynamic;
162 /**
163 * Switch: warn about use of variable before declaration?
164 * RFE: 6425594
165 */
166 boolean useBeforeDeclarationWarning;
168 /**
169 * Switch: allow lint infrastructure to control Sun proprietary
170 * API warnings.
171 */
172 boolean enableSunApiLintControl;
174 /**
175 * Switch: allow strings in switch?
176 */
177 boolean allowStringsInSwitch;
179 /**
180 * Switch: name of source level; used for error reporting.
181 */
182 String sourceName;
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 }
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 }
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 }
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 }
266 /** Is this symbol a type?
267 */
268 static boolean isType(Symbol sym) {
269 return sym != null && sym.kind == TYP;
270 }
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 }
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 }
309 @Override
310 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
311 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
312 }
313 }
315 public Type coerce(Type etype, Type ttype) {
316 return cfolder.coerce(etype, ttype);
317 }
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 }
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 }
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 }
353 private JCTree breakTree = null;
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 }
364 /* ************************************************************************
365 * Visitor methods
366 *************************************************************************/
368 /** Visitor argument: the current environment.
369 */
370 Env<AttrContext> env;
372 /** Visitor argument: the currently expected proto-kind.
373 */
374 int pkind;
376 /** Visitor argument: the currently expected proto-type.
377 */
378 Type pt;
380 /** Visitor result: the computed type.
381 */
382 Type result;
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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 }
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);
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();
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 }
625 public void visitMethodDef(JCMethodDecl tree) {
626 MethodSymbol m = tree.sym;
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);
633 attribBounds(tree.typarams);
635 // If we override any other methods, check that we do so properly.
636 // JLS ???
637 chk.checkOverride(tree, m);
639 // Create a new environment with local scope
640 // for attributing the method.
641 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
643 localEnv.info.lint = lint;
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);
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");
655 // Attribute all value parameters.
656 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
657 attribStat(l.head, localEnv);
658 }
660 // Check that type parameters are well-formed.
661 chk.validate(tree.typarams, localEnv);
662 if ((owner.flags() & ANNOTATION) != 0 &&
663 tree.typarams.nonEmpty())
664 log.error(tree.typarams.head.pos(),
665 "intf.annotation.members.cant.have.type.params");
667 // Check that result type is well-formed.
668 chk.validate(tree.restype, localEnv);
669 if ((owner.flags() & ANNOTATION) != 0)
670 chk.validateAnnotationType(tree.restype);
672 if ((owner.flags() & ANNOTATION) != 0)
673 chk.validateAnnotationMethod(tree.pos(), m);
675 // Check that all exceptions mentioned in the throws clause extend
676 // java.lang.Throwable.
677 if ((owner.flags() & ANNOTATION) != 0 && tree.thrown.nonEmpty())
678 log.error(tree.thrown.head.pos(),
679 "throws.not.allowed.in.intf.annotation");
680 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
681 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
683 if (tree.body == null) {
684 // Empty bodies are only allowed for
685 // abstract, native, or interface methods, or for methods
686 // in a retrofit signature class.
687 if ((owner.flags() & INTERFACE) == 0 &&
688 (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 &&
689 !relax)
690 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
691 if (tree.defaultValue != null) {
692 if ((owner.flags() & ANNOTATION) == 0)
693 log.error(tree.pos(),
694 "default.allowed.in.intf.annotation.member");
695 }
696 } else if ((owner.flags() & INTERFACE) != 0) {
697 log.error(tree.body.pos(), "intf.meth.cant.have.body");
698 } else if ((tree.mods.flags & ABSTRACT) != 0) {
699 log.error(tree.pos(), "abstract.meth.cant.have.body");
700 } else if ((tree.mods.flags & NATIVE) != 0) {
701 log.error(tree.pos(), "native.meth.cant.have.body");
702 } else {
703 // Add an implicit super() call unless an explicit call to
704 // super(...) or this(...) is given
705 // or we are compiling class java.lang.Object.
706 if (tree.name == names.init && owner.type != syms.objectType) {
707 JCBlock body = tree.body;
708 if (body.stats.isEmpty() ||
709 !TreeInfo.isSelfCall(body.stats.head)) {
710 body.stats = body.stats.
711 prepend(memberEnter.SuperCall(make.at(body.pos),
712 List.<Type>nil(),
713 List.<JCVariableDecl>nil(),
714 false));
715 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
716 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
717 TreeInfo.isSuperCall(body.stats.head)) {
718 // enum constructors are not allowed to call super
719 // directly, so make sure there aren't any super calls
720 // in enum constructors, except in the compiler
721 // generated one.
722 log.error(tree.body.stats.head.pos(),
723 "call.to.super.not.allowed.in.enum.ctor",
724 env.enclClass.sym);
725 }
726 }
728 // Attribute method body.
729 attribStat(tree.body, localEnv);
730 }
731 localEnv.info.scope.leave();
732 result = tree.type = m.type;
733 chk.validateAnnotations(tree.mods.annotations, m);
734 }
735 finally {
736 chk.setLint(prevLint);
737 }
738 }
740 public void visitVarDef(JCVariableDecl tree) {
741 // Local variables have not been entered yet, so we need to do it now:
742 if (env.info.scope.owner.kind == MTH) {
743 if (tree.sym != null) {
744 // parameters have already been entered
745 env.info.scope.enter(tree.sym);
746 } else {
747 memberEnter.memberEnter(tree, env);
748 annotate.flush();
749 }
750 }
752 VarSymbol v = tree.sym;
753 Lint lint = env.info.lint.augment(v.attributes_field, v.flags());
754 Lint prevLint = chk.setLint(lint);
756 // Check that the variable's declared type is well-formed.
757 chk.validate(tree.vartype, env);
759 try {
760 chk.checkDeprecatedAnnotation(tree.pos(), v);
762 if (tree.init != null) {
763 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
764 // In this case, `v' is final. Ensure that it's initializer is
765 // evaluated.
766 v.getConstValue(); // ensure initializer is evaluated
767 } else {
768 // Attribute initializer in a new environment
769 // with the declared variable as owner.
770 // Check that initializer conforms to variable's declared type.
771 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
772 initEnv.info.lint = lint;
773 // In order to catch self-references, we set the variable's
774 // declaration position to maximal possible value, effectively
775 // marking the variable as undefined.
776 initEnv.info.enclVar = v;
777 attribExpr(tree.init, initEnv, v.type);
778 }
779 }
780 result = tree.type = v.type;
781 chk.validateAnnotations(tree.mods.annotations, v);
782 }
783 finally {
784 chk.setLint(prevLint);
785 }
786 }
788 public void visitSkip(JCSkip tree) {
789 result = null;
790 }
792 public void visitBlock(JCBlock tree) {
793 if (env.info.scope.owner.kind == TYP) {
794 // Block is a static or instance initializer;
795 // let the owner of the environment be a freshly
796 // created BLOCK-method.
797 Env<AttrContext> localEnv =
798 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
799 localEnv.info.scope.owner =
800 new MethodSymbol(tree.flags | BLOCK, names.empty, null,
801 env.info.scope.owner);
802 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
803 attribStats(tree.stats, localEnv);
804 } else {
805 // Create a new local environment with a local scope.
806 Env<AttrContext> localEnv =
807 env.dup(tree, env.info.dup(env.info.scope.dup()));
808 attribStats(tree.stats, localEnv);
809 localEnv.info.scope.leave();
810 }
811 result = null;
812 }
814 public void visitDoLoop(JCDoWhileLoop tree) {
815 attribStat(tree.body, env.dup(tree));
816 attribExpr(tree.cond, env, syms.booleanType);
817 result = null;
818 }
820 public void visitWhileLoop(JCWhileLoop tree) {
821 attribExpr(tree.cond, env, syms.booleanType);
822 attribStat(tree.body, env.dup(tree));
823 result = null;
824 }
826 public void visitForLoop(JCForLoop tree) {
827 Env<AttrContext> loopEnv =
828 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
829 attribStats(tree.init, loopEnv);
830 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
831 loopEnv.tree = tree; // before, we were not in loop!
832 attribStats(tree.step, loopEnv);
833 attribStat(tree.body, loopEnv);
834 loopEnv.info.scope.leave();
835 result = null;
836 }
838 public void visitForeachLoop(JCEnhancedForLoop tree) {
839 Env<AttrContext> loopEnv =
840 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
841 attribStat(tree.var, loopEnv);
842 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
843 chk.checkNonVoid(tree.pos(), exprType);
844 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
845 if (elemtype == null) {
846 // or perhaps expr implements Iterable<T>?
847 Type base = types.asSuper(exprType, syms.iterableType.tsym);
848 if (base == null) {
849 log.error(tree.expr.pos(), "foreach.not.applicable.to.type");
850 elemtype = types.createErrorType(exprType);
851 } else {
852 List<Type> iterableParams = base.allparams();
853 elemtype = iterableParams.isEmpty()
854 ? syms.objectType
855 : types.upperBound(iterableParams.head);
856 }
857 }
858 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
859 loopEnv.tree = tree; // before, we were not in loop!
860 attribStat(tree.body, loopEnv);
861 loopEnv.info.scope.leave();
862 result = null;
863 }
865 public void visitLabelled(JCLabeledStatement tree) {
866 // Check that label is not used in an enclosing statement
867 Env<AttrContext> env1 = env;
868 while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) {
869 if (env1.tree.getTag() == JCTree.LABELLED &&
870 ((JCLabeledStatement) env1.tree).label == tree.label) {
871 log.error(tree.pos(), "label.already.in.use",
872 tree.label);
873 break;
874 }
875 env1 = env1.next;
876 }
878 attribStat(tree.body, env.dup(tree));
879 result = null;
880 }
882 public void visitSwitch(JCSwitch tree) {
883 Type seltype = attribExpr(tree.selector, env);
885 Env<AttrContext> switchEnv =
886 env.dup(tree, env.info.dup(env.info.scope.dup()));
888 boolean enumSwitch =
889 allowEnums &&
890 (seltype.tsym.flags() & Flags.ENUM) != 0;
891 boolean stringSwitch = false;
892 if (types.isSameType(seltype, syms.stringType)) {
893 if (allowStringsInSwitch) {
894 stringSwitch = true;
895 } else {
896 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
897 }
898 }
899 if (!enumSwitch && !stringSwitch)
900 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
902 // Attribute all cases and
903 // check that there are no duplicate case labels or default clauses.
904 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
905 boolean hasDefault = false; // Is there a default label?
906 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
907 JCCase c = l.head;
908 Env<AttrContext> caseEnv =
909 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
910 if (c.pat != null) {
911 if (enumSwitch) {
912 Symbol sym = enumConstant(c.pat, seltype);
913 if (sym == null) {
914 log.error(c.pat.pos(), "enum.const.req");
915 } else if (!labels.add(sym)) {
916 log.error(c.pos(), "duplicate.case.label");
917 }
918 } else {
919 Type pattype = attribExpr(c.pat, switchEnv, seltype);
920 if (pattype.tag != ERROR) {
921 if (pattype.constValue() == null) {
922 log.error(c.pat.pos(),
923 (stringSwitch ? "string.const.req" : "const.expr.req"));
924 } else if (labels.contains(pattype.constValue())) {
925 log.error(c.pos(), "duplicate.case.label");
926 } else {
927 labels.add(pattype.constValue());
928 }
929 }
930 }
931 } else if (hasDefault) {
932 log.error(c.pos(), "duplicate.default.label");
933 } else {
934 hasDefault = true;
935 }
936 attribStats(c.stats, caseEnv);
937 caseEnv.info.scope.leave();
938 addVars(c.stats, switchEnv.info.scope);
939 }
941 switchEnv.info.scope.leave();
942 result = null;
943 }
944 // where
945 /** Add any variables defined in stats to the switch scope. */
946 private static void addVars(List<JCStatement> stats, Scope switchScope) {
947 for (;stats.nonEmpty(); stats = stats.tail) {
948 JCTree stat = stats.head;
949 if (stat.getTag() == JCTree.VARDEF)
950 switchScope.enter(((JCVariableDecl) stat).sym);
951 }
952 }
953 // where
954 /** Return the selected enumeration constant symbol, or null. */
955 private Symbol enumConstant(JCTree tree, Type enumType) {
956 if (tree.getTag() != JCTree.IDENT) {
957 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
958 return syms.errSymbol;
959 }
960 JCIdent ident = (JCIdent)tree;
961 Name name = ident.name;
962 for (Scope.Entry e = enumType.tsym.members().lookup(name);
963 e.scope != null; e = e.next()) {
964 if (e.sym.kind == VAR) {
965 Symbol s = ident.sym = e.sym;
966 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
967 ident.type = s.type;
968 return ((s.flags_field & Flags.ENUM) == 0)
969 ? null : s;
970 }
971 }
972 return null;
973 }
975 public void visitSynchronized(JCSynchronized tree) {
976 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
977 attribStat(tree.body, env);
978 result = null;
979 }
981 public void visitTry(JCTry tree) {
982 // Attribute body
983 attribStat(tree.body, env.dup(tree, env.info.dup()));
985 // Attribute catch clauses
986 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
987 JCCatch c = l.head;
988 Env<AttrContext> catchEnv =
989 env.dup(c, env.info.dup(env.info.scope.dup()));
990 Type ctype = attribStat(c.param, catchEnv);
991 if (TreeInfo.isMultiCatch(c)) {
992 //check that multi-catch parameter is marked as final
993 if ((c.param.sym.flags() & FINAL) == 0) {
994 log.error(c.param.pos(), "multicatch.param.must.be.final", c.param.sym);
995 }
996 c.param.sym.flags_field = c.param.sym.flags() | DISJOINT;
997 }
998 if (c.param.type.tsym.kind == Kinds.VAR) {
999 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1000 }
1001 chk.checkType(c.param.vartype.pos(),
1002 chk.checkClassType(c.param.vartype.pos(), ctype),
1003 syms.throwableType);
1004 attribStat(c.body, catchEnv);
1005 catchEnv.info.scope.leave();
1006 }
1008 // Attribute finalizer
1009 if (tree.finalizer != null) attribStat(tree.finalizer, env);
1010 result = null;
1011 }
1013 public void visitConditional(JCConditional tree) {
1014 attribExpr(tree.cond, env, syms.booleanType);
1015 attribExpr(tree.truepart, env);
1016 attribExpr(tree.falsepart, env);
1017 result = check(tree,
1018 capture(condType(tree.pos(), tree.cond.type,
1019 tree.truepart.type, tree.falsepart.type)),
1020 VAL, pkind, pt);
1021 }
1022 //where
1023 /** Compute the type of a conditional expression, after
1024 * checking that it exists. See Spec 15.25.
1025 *
1026 * @param pos The source position to be used for
1027 * error diagnostics.
1028 * @param condtype The type of the expression's condition.
1029 * @param thentype The type of the expression's then-part.
1030 * @param elsetype The type of the expression's else-part.
1031 */
1032 private Type condType(DiagnosticPosition pos,
1033 Type condtype,
1034 Type thentype,
1035 Type elsetype) {
1036 Type ctype = condType1(pos, condtype, thentype, elsetype);
1038 // If condition and both arms are numeric constants,
1039 // evaluate at compile-time.
1040 return ((condtype.constValue() != null) &&
1041 (thentype.constValue() != null) &&
1042 (elsetype.constValue() != null))
1043 ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype)
1044 : ctype;
1045 }
1046 /** Compute the type of a conditional expression, after
1047 * checking that it exists. Does not take into
1048 * account the special case where condition and both arms
1049 * are constants.
1050 *
1051 * @param pos The source position to be used for error
1052 * diagnostics.
1053 * @param condtype The type of the expression's condition.
1054 * @param thentype The type of the expression's then-part.
1055 * @param elsetype The type of the expression's else-part.
1056 */
1057 private Type condType1(DiagnosticPosition pos, Type condtype,
1058 Type thentype, Type elsetype) {
1059 // If same type, that is the result
1060 if (types.isSameType(thentype, elsetype))
1061 return thentype.baseType();
1063 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1064 ? thentype : types.unboxedType(thentype);
1065 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1066 ? elsetype : types.unboxedType(elsetype);
1068 // Otherwise, if both arms can be converted to a numeric
1069 // type, return the least numeric type that fits both arms
1070 // (i.e. return larger of the two, or return int if one
1071 // arm is short, the other is char).
1072 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1073 // If one arm has an integer subrange type (i.e., byte,
1074 // short, or char), and the other is an integer constant
1075 // that fits into the subrange, return the subrange type.
1076 if (thenUnboxed.tag < INT && elseUnboxed.tag == INT &&
1077 types.isAssignable(elseUnboxed, thenUnboxed))
1078 return thenUnboxed.baseType();
1079 if (elseUnboxed.tag < INT && thenUnboxed.tag == INT &&
1080 types.isAssignable(thenUnboxed, elseUnboxed))
1081 return elseUnboxed.baseType();
1083 for (int i = BYTE; i < VOID; i++) {
1084 Type candidate = syms.typeOfTag[i];
1085 if (types.isSubtype(thenUnboxed, candidate) &&
1086 types.isSubtype(elseUnboxed, candidate))
1087 return candidate;
1088 }
1089 }
1091 // Those were all the cases that could result in a primitive
1092 if (allowBoxing) {
1093 if (thentype.isPrimitive())
1094 thentype = types.boxedClass(thentype).type;
1095 if (elsetype.isPrimitive())
1096 elsetype = types.boxedClass(elsetype).type;
1097 }
1099 if (types.isSubtype(thentype, elsetype))
1100 return elsetype.baseType();
1101 if (types.isSubtype(elsetype, thentype))
1102 return thentype.baseType();
1104 if (!allowBoxing || thentype.tag == VOID || elsetype.tag == VOID) {
1105 log.error(pos, "neither.conditional.subtype",
1106 thentype, elsetype);
1107 return thentype.baseType();
1108 }
1110 // both are known to be reference types. The result is
1111 // lub(thentype,elsetype). This cannot fail, as it will
1112 // always be possible to infer "Object" if nothing better.
1113 return types.lub(thentype.baseType(), elsetype.baseType());
1114 }
1116 public void visitIf(JCIf tree) {
1117 attribExpr(tree.cond, env, syms.booleanType);
1118 attribStat(tree.thenpart, env);
1119 if (tree.elsepart != null)
1120 attribStat(tree.elsepart, env);
1121 chk.checkEmptyIf(tree);
1122 result = null;
1123 }
1125 public void visitExec(JCExpressionStatement tree) {
1126 attribExpr(tree.expr, env);
1127 result = null;
1128 }
1130 public void visitBreak(JCBreak tree) {
1131 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1132 result = null;
1133 }
1135 public void visitContinue(JCContinue tree) {
1136 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1137 result = null;
1138 }
1139 //where
1140 /** Return the target of a break or continue statement, if it exists,
1141 * report an error if not.
1142 * Note: The target of a labelled break or continue is the
1143 * (non-labelled) statement tree referred to by the label,
1144 * not the tree representing the labelled statement itself.
1145 *
1146 * @param pos The position to be used for error diagnostics
1147 * @param tag The tag of the jump statement. This is either
1148 * Tree.BREAK or Tree.CONTINUE.
1149 * @param label The label of the jump statement, or null if no
1150 * label is given.
1151 * @param env The environment current at the jump statement.
1152 */
1153 private JCTree findJumpTarget(DiagnosticPosition pos,
1154 int tag,
1155 Name label,
1156 Env<AttrContext> env) {
1157 // Search environments outwards from the point of jump.
1158 Env<AttrContext> env1 = env;
1159 LOOP:
1160 while (env1 != null) {
1161 switch (env1.tree.getTag()) {
1162 case JCTree.LABELLED:
1163 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1164 if (label == labelled.label) {
1165 // If jump is a continue, check that target is a loop.
1166 if (tag == JCTree.CONTINUE) {
1167 if (labelled.body.getTag() != JCTree.DOLOOP &&
1168 labelled.body.getTag() != JCTree.WHILELOOP &&
1169 labelled.body.getTag() != JCTree.FORLOOP &&
1170 labelled.body.getTag() != JCTree.FOREACHLOOP)
1171 log.error(pos, "not.loop.label", label);
1172 // Found labelled statement target, now go inwards
1173 // to next non-labelled tree.
1174 return TreeInfo.referencedStatement(labelled);
1175 } else {
1176 return labelled;
1177 }
1178 }
1179 break;
1180 case JCTree.DOLOOP:
1181 case JCTree.WHILELOOP:
1182 case JCTree.FORLOOP:
1183 case JCTree.FOREACHLOOP:
1184 if (label == null) return env1.tree;
1185 break;
1186 case JCTree.SWITCH:
1187 if (label == null && tag == JCTree.BREAK) return env1.tree;
1188 break;
1189 case JCTree.METHODDEF:
1190 case JCTree.CLASSDEF:
1191 break LOOP;
1192 default:
1193 }
1194 env1 = env1.next;
1195 }
1196 if (label != null)
1197 log.error(pos, "undef.label", label);
1198 else if (tag == JCTree.CONTINUE)
1199 log.error(pos, "cont.outside.loop");
1200 else
1201 log.error(pos, "break.outside.switch.loop");
1202 return null;
1203 }
1205 public void visitReturn(JCReturn tree) {
1206 // Check that there is an enclosing method which is
1207 // nested within than the enclosing class.
1208 if (env.enclMethod == null ||
1209 env.enclMethod.sym.owner != env.enclClass.sym) {
1210 log.error(tree.pos(), "ret.outside.meth");
1212 } else {
1213 // Attribute return expression, if it exists, and check that
1214 // it conforms to result type of enclosing method.
1215 Symbol m = env.enclMethod.sym;
1216 if (m.type.getReturnType().tag == VOID) {
1217 if (tree.expr != null)
1218 log.error(tree.expr.pos(),
1219 "cant.ret.val.from.meth.decl.void");
1220 } else if (tree.expr == null) {
1221 log.error(tree.pos(), "missing.ret.val");
1222 } else {
1223 attribExpr(tree.expr, env, m.type.getReturnType());
1224 }
1225 }
1226 result = null;
1227 }
1229 public void visitThrow(JCThrow tree) {
1230 attribExpr(tree.expr, env, syms.throwableType);
1231 result = null;
1232 }
1234 public void visitAssert(JCAssert tree) {
1235 attribExpr(tree.cond, env, syms.booleanType);
1236 if (tree.detail != null) {
1237 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1238 }
1239 result = null;
1240 }
1242 /** Visitor method for method invocations.
1243 * NOTE: The method part of an application will have in its type field
1244 * the return type of the method, not the method's type itself!
1245 */
1246 public void visitApply(JCMethodInvocation tree) {
1247 // The local environment of a method application is
1248 // a new environment nested in the current one.
1249 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1251 // The types of the actual method arguments.
1252 List<Type> argtypes;
1254 // The types of the actual method type arguments.
1255 List<Type> typeargtypes = null;
1256 boolean typeargtypesNonRefOK = false;
1258 Name methName = TreeInfo.name(tree.meth);
1260 boolean isConstructorCall =
1261 methName == names._this || methName == names._super;
1263 if (isConstructorCall) {
1264 // We are seeing a ...this(...) or ...super(...) call.
1265 // Check that this is the first statement in a constructor.
1266 if (checkFirstConstructorStat(tree, env)) {
1268 // Record the fact
1269 // that this is a constructor call (using isSelfCall).
1270 localEnv.info.isSelfCall = true;
1272 // Attribute arguments, yielding list of argument types.
1273 argtypes = attribArgs(tree.args, localEnv);
1274 typeargtypes = attribTypes(tree.typeargs, localEnv);
1276 // Variable `site' points to the class in which the called
1277 // constructor is defined.
1278 Type site = env.enclClass.sym.type;
1279 if (methName == names._super) {
1280 if (site == syms.objectType) {
1281 log.error(tree.meth.pos(), "no.superclass", site);
1282 site = types.createErrorType(syms.objectType);
1283 } else {
1284 site = types.supertype(site);
1285 }
1286 }
1288 if (site.tag == CLASS) {
1289 Type encl = site.getEnclosingType();
1290 while (encl != null && encl.tag == TYPEVAR)
1291 encl = encl.getUpperBound();
1292 if (encl.tag == CLASS) {
1293 // we are calling a nested class
1295 if (tree.meth.getTag() == JCTree.SELECT) {
1296 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1298 // We are seeing a prefixed call, of the form
1299 // <expr>.super(...).
1300 // Check that the prefix expression conforms
1301 // to the outer instance type of the class.
1302 chk.checkRefType(qualifier.pos(),
1303 attribExpr(qualifier, localEnv,
1304 encl));
1305 } else if (methName == names._super) {
1306 // qualifier omitted; check for existence
1307 // of an appropriate implicit qualifier.
1308 rs.resolveImplicitThis(tree.meth.pos(),
1309 localEnv, site);
1310 }
1311 } else if (tree.meth.getTag() == JCTree.SELECT) {
1312 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1313 site.tsym);
1314 }
1316 // if we're calling a java.lang.Enum constructor,
1317 // prefix the implicit String and int parameters
1318 if (site.tsym == syms.enumSym && allowEnums)
1319 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1321 // Resolve the called constructor under the assumption
1322 // that we are referring to a superclass instance of the
1323 // current instance (JLS ???).
1324 boolean selectSuperPrev = localEnv.info.selectSuper;
1325 localEnv.info.selectSuper = true;
1326 localEnv.info.varArgs = false;
1327 Symbol sym = rs.resolveConstructor(
1328 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1329 localEnv.info.selectSuper = selectSuperPrev;
1331 // Set method symbol to resolved constructor...
1332 TreeInfo.setSymbol(tree.meth, sym);
1334 // ...and check that it is legal in the current context.
1335 // (this will also set the tree's type)
1336 Type mpt = newMethTemplate(argtypes, typeargtypes);
1337 checkId(tree.meth, site, sym, localEnv, MTH,
1338 mpt, tree.varargsElement != null);
1339 }
1340 // Otherwise, `site' is an error type and we do nothing
1341 }
1342 result = tree.type = syms.voidType;
1343 } else {
1344 // Otherwise, we are seeing a regular method call.
1345 // Attribute the arguments, yielding list of argument types, ...
1346 argtypes = attribArgs(tree.args, localEnv);
1347 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1349 // ... and attribute the method using as a prototype a methodtype
1350 // whose formal argument types is exactly the list of actual
1351 // arguments (this will also set the method symbol).
1352 Type mpt = newMethTemplate(argtypes, typeargtypes);
1353 localEnv.info.varArgs = false;
1354 Type mtype = attribExpr(tree.meth, localEnv, mpt);
1355 if (localEnv.info.varArgs)
1356 assert mtype.isErroneous() || tree.varargsElement != null;
1358 // Compute the result type.
1359 Type restype = mtype.getReturnType();
1360 assert restype.tag != WILDCARD : mtype;
1362 // as a special case, array.clone() has a result that is
1363 // the same as static type of the array being cloned
1364 if (tree.meth.getTag() == JCTree.SELECT &&
1365 allowCovariantReturns &&
1366 methName == names.clone &&
1367 types.isArray(((JCFieldAccess) tree.meth).selected.type))
1368 restype = ((JCFieldAccess) tree.meth).selected.type;
1370 // as a special case, x.getClass() has type Class<? extends |X|>
1371 if (allowGenerics &&
1372 methName == names.getClass && tree.args.isEmpty()) {
1373 Type qualifier = (tree.meth.getTag() == JCTree.SELECT)
1374 ? ((JCFieldAccess) tree.meth).selected.type
1375 : env.enclClass.sym.type;
1376 restype = new
1377 ClassType(restype.getEnclosingType(),
1378 List.<Type>of(new WildcardType(types.erasure(qualifier),
1379 BoundKind.EXTENDS,
1380 syms.boundClass)),
1381 restype.tsym);
1382 }
1384 // as a special case, MethodHandle.<T>invoke(abc) and InvokeDynamic.<T>foo(abc)
1385 // has type <T>, and T can be a primitive type.
1386 if (tree.meth.getTag() == JCTree.SELECT && !typeargtypes.isEmpty()) {
1387 Type selt = ((JCFieldAccess) tree.meth).selected.type;
1388 if ((selt == syms.methodHandleType && methName == names.invoke) || selt == syms.invokeDynamicType) {
1389 assert types.isSameType(restype, typeargtypes.head) : mtype;
1390 typeargtypesNonRefOK = true;
1391 }
1392 }
1394 if (!typeargtypesNonRefOK) {
1395 chk.checkRefTypes(tree.typeargs, typeargtypes);
1396 }
1398 // Check that value of resulting type is admissible in the
1399 // current context. Also, capture the return type
1400 result = check(tree, capture(restype), VAL, pkind, pt);
1401 }
1402 chk.validate(tree.typeargs, localEnv);
1403 }
1404 //where
1405 /** Check that given application node appears as first statement
1406 * in a constructor call.
1407 * @param tree The application node
1408 * @param env The environment current at the application.
1409 */
1410 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1411 JCMethodDecl enclMethod = env.enclMethod;
1412 if (enclMethod != null && enclMethod.name == names.init) {
1413 JCBlock body = enclMethod.body;
1414 if (body.stats.head.getTag() == JCTree.EXEC &&
1415 ((JCExpressionStatement) body.stats.head).expr == tree)
1416 return true;
1417 }
1418 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1419 TreeInfo.name(tree.meth));
1420 return false;
1421 }
1423 /** Obtain a method type with given argument types.
1424 */
1425 Type newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) {
1426 MethodType mt = new MethodType(argtypes, null, null, syms.methodClass);
1427 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1428 }
1430 public void visitNewClass(JCNewClass tree) {
1431 Type owntype = types.createErrorType(tree.type);
1433 // The local environment of a class creation is
1434 // a new environment nested in the current one.
1435 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1437 // The anonymous inner class definition of the new expression,
1438 // if one is defined by it.
1439 JCClassDecl cdef = tree.def;
1441 // If enclosing class is given, attribute it, and
1442 // complete class name to be fully qualified
1443 JCExpression clazz = tree.clazz; // Class field following new
1444 JCExpression clazzid = // Identifier in class field
1445 (clazz.getTag() == JCTree.TYPEAPPLY)
1446 ? ((JCTypeApply) clazz).clazz
1447 : clazz;
1449 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1451 if (tree.encl != null) {
1452 // We are seeing a qualified new, of the form
1453 // <expr>.new C <...> (...) ...
1454 // In this case, we let clazz stand for the name of the
1455 // allocated class C prefixed with the type of the qualifier
1456 // expression, so that we can
1457 // resolve it with standard techniques later. I.e., if
1458 // <expr> has type T, then <expr>.new C <...> (...)
1459 // yields a clazz T.C.
1460 Type encltype = chk.checkRefType(tree.encl.pos(),
1461 attribExpr(tree.encl, env));
1462 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1463 ((JCIdent) clazzid).name);
1464 if (clazz.getTag() == JCTree.TYPEAPPLY)
1465 clazz = make.at(tree.pos).
1466 TypeApply(clazzid1,
1467 ((JCTypeApply) clazz).arguments);
1468 else
1469 clazz = clazzid1;
1470 }
1472 // Attribute clazz expression and store
1473 // symbol + type back into the attributed tree.
1474 Type clazztype = attribType(clazz, env);
1475 Pair<Scope,Scope> mapping = getSyntheticScopeMapping(clazztype);
1476 if (!TreeInfo.isDiamond(tree)) {
1477 clazztype = chk.checkClassType(
1478 tree.clazz.pos(), clazztype, true);
1479 }
1480 chk.validate(clazz, localEnv);
1481 if (tree.encl != null) {
1482 // We have to work in this case to store
1483 // symbol + type back into the attributed tree.
1484 tree.clazz.type = clazztype;
1485 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1486 clazzid.type = ((JCIdent) clazzid).sym.type;
1487 if (!clazztype.isErroneous()) {
1488 if (cdef != null && clazztype.tsym.isInterface()) {
1489 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1490 } else if (clazztype.tsym.isStatic()) {
1491 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1492 }
1493 }
1494 } else if (!clazztype.tsym.isInterface() &&
1495 clazztype.getEnclosingType().tag == CLASS) {
1496 // Check for the existence of an apropos outer instance
1497 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1498 }
1500 // Attribute constructor arguments.
1501 List<Type> argtypes = attribArgs(tree.args, localEnv);
1502 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1504 if (TreeInfo.isDiamond(tree)) {
1505 clazztype = attribDiamond(localEnv, tree, clazztype, mapping, argtypes, typeargtypes, true);
1506 clazz.type = clazztype;
1507 }
1509 // If we have made no mistakes in the class type...
1510 if (clazztype.tag == CLASS) {
1511 // Enums may not be instantiated except implicitly
1512 if (allowEnums &&
1513 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1514 (env.tree.getTag() != JCTree.VARDEF ||
1515 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1516 ((JCVariableDecl) env.tree).init != tree))
1517 log.error(tree.pos(), "enum.cant.be.instantiated");
1518 // Check that class is not abstract
1519 if (cdef == null &&
1520 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
1521 log.error(tree.pos(), "abstract.cant.be.instantiated",
1522 clazztype.tsym);
1523 } else if (cdef != null && clazztype.tsym.isInterface()) {
1524 // Check that no constructor arguments are given to
1525 // anonymous classes implementing an interface
1526 if (!argtypes.isEmpty())
1527 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
1529 if (!typeargtypes.isEmpty())
1530 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
1532 // Error recovery: pretend no arguments were supplied.
1533 argtypes = List.nil();
1534 typeargtypes = List.nil();
1535 }
1537 // Resolve the called constructor under the assumption
1538 // that we are referring to a superclass instance of the
1539 // current instance (JLS ???).
1540 else {
1541 localEnv.info.selectSuper = cdef != null;
1542 localEnv.info.varArgs = false;
1543 tree.constructor = rs.resolveConstructor(
1544 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
1545 tree.constructorType = checkMethod(clazztype,
1546 tree.constructor,
1547 localEnv,
1548 tree.args,
1549 argtypes,
1550 typeargtypes,
1551 localEnv.info.varArgs);
1552 if (localEnv.info.varArgs)
1553 assert tree.constructorType.isErroneous() || tree.varargsElement != null;
1554 }
1556 if (cdef != null) {
1557 // We are seeing an anonymous class instance creation.
1558 // In this case, the class instance creation
1559 // expression
1560 //
1561 // E.new <typeargs1>C<typargs2>(args) { ... }
1562 //
1563 // is represented internally as
1564 //
1565 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
1566 //
1567 // This expression is then *transformed* as follows:
1568 //
1569 // (1) add a STATIC flag to the class definition
1570 // if the current environment is static
1571 // (2) add an extends or implements clause
1572 // (3) add a constructor.
1573 //
1574 // For instance, if C is a class, and ET is the type of E,
1575 // the expression
1576 //
1577 // E.new <typeargs1>C<typargs2>(args) { ... }
1578 //
1579 // is translated to (where X is a fresh name and typarams is the
1580 // parameter list of the super constructor):
1581 //
1582 // new <typeargs1>X(<*nullchk*>E, args) where
1583 // X extends C<typargs2> {
1584 // <typarams> X(ET e, args) {
1585 // e.<typeargs1>super(args)
1586 // }
1587 // ...
1588 // }
1589 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
1591 if (clazztype.tsym.isInterface()) {
1592 cdef.implementing = List.of(clazz);
1593 } else {
1594 cdef.extending = clazz;
1595 }
1597 attribStat(cdef, localEnv);
1599 // If an outer instance is given,
1600 // prefix it to the constructor arguments
1601 // and delete it from the new expression
1602 if (tree.encl != null && !clazztype.tsym.isInterface()) {
1603 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
1604 argtypes = argtypes.prepend(tree.encl.type);
1605 tree.encl = null;
1606 }
1608 // Reassign clazztype and recompute constructor.
1609 clazztype = cdef.sym.type;
1610 Symbol sym = rs.resolveConstructor(
1611 tree.pos(), localEnv, clazztype, argtypes,
1612 typeargtypes, true, tree.varargsElement != null);
1613 assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous();
1614 tree.constructor = sym;
1615 if (tree.constructor.kind > ERRONEOUS) {
1616 tree.constructorType = syms.errType;
1617 }
1618 else {
1619 tree.constructorType = checkMethod(clazztype,
1620 tree.constructor,
1621 localEnv,
1622 tree.args,
1623 argtypes,
1624 typeargtypes,
1625 localEnv.info.varArgs);
1626 }
1627 }
1629 if (tree.constructor != null && tree.constructor.kind == MTH)
1630 owntype = clazztype;
1631 }
1632 result = check(tree, owntype, VAL, pkind, pt);
1633 chk.validate(tree.typeargs, localEnv);
1634 }
1636 Type attribDiamond(Env<AttrContext> env,
1637 JCNewClass tree,
1638 Type clazztype,
1639 Pair<Scope, Scope> mapping,
1640 List<Type> argtypes,
1641 List<Type> typeargtypes,
1642 boolean reportErrors) {
1643 if (clazztype.isErroneous() || mapping == erroneousMapping) {
1644 //if the type of the instance creation expression is erroneous,
1645 //or something prevented us to form a valid mapping, return the
1646 //(possibly erroneous) type unchanged
1647 return clazztype;
1648 }
1649 else if (clazztype.isInterface()) {
1650 //if the type of the instance creation expression is an interface
1651 //skip the method resolution step (JLS 15.12.2.7). The type to be
1652 //inferred is of the kind <X1,X2, ... Xn>C<X1,X2, ... Xn>
1653 clazztype = new ForAll(clazztype.tsym.type.allparams(),
1654 clazztype.tsym.type);
1655 } else {
1656 //if the type of the instance creation expression is a class type
1657 //apply method resolution inference (JLS 15.12.2.7). The return type
1658 //of the resolved constructor will be a partially instantiated type
1659 ((ClassSymbol) clazztype.tsym).members_field = mapping.snd;
1660 Symbol constructor;
1661 try {
1662 constructor = rs.resolveDiamond(tree.pos(),
1663 env,
1664 clazztype.tsym.type,
1665 argtypes,
1666 typeargtypes, reportErrors);
1667 } finally {
1668 ((ClassSymbol) clazztype.tsym).members_field = mapping.fst;
1669 }
1670 if (constructor.kind == MTH) {
1671 ClassType ct = new ClassType(clazztype.getEnclosingType(),
1672 clazztype.tsym.type.getTypeArguments(),
1673 clazztype.tsym);
1674 clazztype = checkMethod(ct,
1675 constructor,
1676 env,
1677 tree.args,
1678 argtypes,
1679 typeargtypes,
1680 env.info.varArgs).getReturnType();
1681 } else {
1682 clazztype = syms.errType;
1683 }
1684 }
1685 if (clazztype.tag == FORALL && !pt.isErroneous()) {
1686 //if the resolved constructor's return type has some uninferred
1687 //type-variables, infer them using the expected type and declared
1688 //bounds (JLS 15.12.2.8).
1689 try {
1690 clazztype = infer.instantiateExpr((ForAll) clazztype,
1691 pt.tag == NONE ? syms.objectType : pt,
1692 Warner.noWarnings);
1693 } catch (Infer.InferenceException ex) {
1694 //an error occurred while inferring uninstantiated type-variables
1695 //we need to optionally report an error
1696 if (reportErrors) {
1697 log.error(tree.clazz.pos(),
1698 "cant.apply.diamond.1",
1699 diags.fragment("diamond", clazztype.tsym),
1700 ex.diagnostic);
1701 }
1702 }
1703 }
1704 if (reportErrors) {
1705 clazztype = chk.checkClassType(tree.clazz.pos(),
1706 clazztype,
1707 true);
1708 if (clazztype.tag == CLASS) {
1709 List<Type> invalidDiamondArgs = chk.checkDiamond((ClassType)clazztype);
1710 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
1711 //one or more types inferred in the previous steps is either a
1712 //captured type or an intersection type --- we need to report an error.
1713 String subkey = invalidDiamondArgs.size() > 1 ?
1714 "diamond.invalid.args" :
1715 "diamond.invalid.arg";
1716 //The error message is of the kind:
1717 //
1718 //cannot infer type arguments for {clazztype}<>;
1719 //reason: {subkey}
1720 //
1721 //where subkey is a fragment of the kind:
1722 //
1723 //type argument(s) {invalidDiamondArgs} inferred for {clazztype}<> is not allowed in this context
1724 log.error(tree.clazz.pos(),
1725 "cant.apply.diamond.1",
1726 diags.fragment("diamond", clazztype.tsym),
1727 diags.fragment(subkey,
1728 invalidDiamondArgs,
1729 diags.fragment("diamond", clazztype.tsym)));
1730 }
1731 }
1732 }
1733 return clazztype;
1734 }
1736 /** Creates a synthetic scope containing fake generic constructors.
1737 * Assuming that the original scope contains a constructor of the kind:
1738 * Foo(X x, Y y), where X,Y are class type-variables declared in Foo,
1739 * the synthetic scope is added a generic constructor of the kind:
1740 * <X,Y>Foo<X,Y>(X x, Y y). This is crucial in order to enable diamond
1741 * inference. The inferred return type of the synthetic constructor IS
1742 * the inferred type for the diamond operator.
1743 */
1744 private Pair<Scope, Scope> getSyntheticScopeMapping(Type ctype) {
1745 if (ctype.tag != CLASS) {
1746 return erroneousMapping;
1747 }
1748 Pair<Scope, Scope> mapping =
1749 new Pair<Scope, Scope>(ctype.tsym.members(), new Scope(ctype.tsym));
1750 List<Type> typevars = ctype.tsym.type.getTypeArguments();
1751 for (Scope.Entry e = mapping.fst.lookup(names.init);
1752 e.scope != null;
1753 e = e.next()) {
1754 MethodSymbol newConstr = (MethodSymbol) e.sym.clone(ctype.tsym);
1755 newConstr.name = names.init;
1756 List<Type> oldTypeargs = List.nil();
1757 if (newConstr.type.tag == FORALL) {
1758 oldTypeargs = ((ForAll) newConstr.type).tvars;
1759 }
1760 newConstr.type = new MethodType(newConstr.type.getParameterTypes(),
1761 new ClassType(ctype.getEnclosingType(), ctype.tsym.type.getTypeArguments(), ctype.tsym),
1762 newConstr.type.getThrownTypes(),
1763 syms.methodClass);
1764 newConstr.type = new ForAll(typevars.prependList(oldTypeargs), newConstr.type);
1765 mapping.snd.enter(newConstr);
1766 }
1767 return mapping;
1768 }
1770 private final Pair<Scope,Scope> erroneousMapping = new Pair<Scope,Scope>(null, null);
1772 /** Make an attributed null check tree.
1773 */
1774 public JCExpression makeNullCheck(JCExpression arg) {
1775 // optimization: X.this is never null; skip null check
1776 Name name = TreeInfo.name(arg);
1777 if (name == names._this || name == names._super) return arg;
1779 int optag = JCTree.NULLCHK;
1780 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
1781 tree.operator = syms.nullcheck;
1782 tree.type = arg.type;
1783 return tree;
1784 }
1786 public void visitNewArray(JCNewArray tree) {
1787 Type owntype = types.createErrorType(tree.type);
1788 Type elemtype;
1789 if (tree.elemtype != null) {
1790 elemtype = attribType(tree.elemtype, env);
1791 chk.validate(tree.elemtype, env);
1792 owntype = elemtype;
1793 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1794 attribExpr(l.head, env, syms.intType);
1795 owntype = new ArrayType(owntype, syms.arrayClass);
1796 }
1797 } else {
1798 // we are seeing an untyped aggregate { ... }
1799 // this is allowed only if the prototype is an array
1800 if (pt.tag == ARRAY) {
1801 elemtype = types.elemtype(pt);
1802 } else {
1803 if (pt.tag != ERROR) {
1804 log.error(tree.pos(), "illegal.initializer.for.type",
1805 pt);
1806 }
1807 elemtype = types.createErrorType(pt);
1808 }
1809 }
1810 if (tree.elems != null) {
1811 attribExprs(tree.elems, env, elemtype);
1812 owntype = new ArrayType(elemtype, syms.arrayClass);
1813 }
1814 if (!types.isReifiable(elemtype))
1815 log.error(tree.pos(), "generic.array.creation");
1816 result = check(tree, owntype, VAL, pkind, pt);
1817 }
1819 public void visitParens(JCParens tree) {
1820 Type owntype = attribTree(tree.expr, env, pkind, pt);
1821 result = check(tree, owntype, pkind, pkind, pt);
1822 Symbol sym = TreeInfo.symbol(tree);
1823 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
1824 log.error(tree.pos(), "illegal.start.of.type");
1825 }
1827 public void visitAssign(JCAssign tree) {
1828 Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType);
1829 Type capturedType = capture(owntype);
1830 attribExpr(tree.rhs, env, owntype);
1831 result = check(tree, capturedType, VAL, pkind, pt);
1832 }
1834 public void visitAssignop(JCAssignOp tree) {
1835 // Attribute arguments.
1836 Type owntype = attribTree(tree.lhs, env, VAR, Type.noType);
1837 Type operand = attribExpr(tree.rhs, env);
1838 // Find operator.
1839 Symbol operator = tree.operator = rs.resolveBinaryOperator(
1840 tree.pos(), tree.getTag() - JCTree.ASGOffset, env,
1841 owntype, operand);
1843 if (operator.kind == MTH) {
1844 chk.checkOperator(tree.pos(),
1845 (OperatorSymbol)operator,
1846 tree.getTag() - JCTree.ASGOffset,
1847 owntype,
1848 operand);
1849 chk.checkDivZero(tree.rhs.pos(), operator, operand);
1850 chk.checkCastable(tree.rhs.pos(),
1851 operator.type.getReturnType(),
1852 owntype);
1853 }
1854 result = check(tree, owntype, VAL, pkind, pt);
1855 }
1857 public void visitUnary(JCUnary tree) {
1858 // Attribute arguments.
1859 Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1860 ? attribTree(tree.arg, env, VAR, Type.noType)
1861 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
1863 // Find operator.
1864 Symbol operator = tree.operator =
1865 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
1867 Type owntype = types.createErrorType(tree.type);
1868 if (operator.kind == MTH) {
1869 owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1870 ? tree.arg.type
1871 : operator.type.getReturnType();
1872 int opc = ((OperatorSymbol)operator).opcode;
1874 // If the argument is constant, fold it.
1875 if (argtype.constValue() != null) {
1876 Type ctype = cfolder.fold1(opc, argtype);
1877 if (ctype != null) {
1878 owntype = cfolder.coerce(ctype, owntype);
1880 // Remove constant types from arguments to
1881 // conserve space. The parser will fold concatenations
1882 // of string literals; the code here also
1883 // gets rid of intermediate results when some of the
1884 // operands are constant identifiers.
1885 if (tree.arg.type.tsym == syms.stringType.tsym) {
1886 tree.arg.type = syms.stringType;
1887 }
1888 }
1889 }
1890 }
1891 result = check(tree, owntype, VAL, pkind, pt);
1892 }
1894 public void visitBinary(JCBinary tree) {
1895 // Attribute arguments.
1896 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
1897 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
1899 // Find operator.
1900 Symbol operator = tree.operator =
1901 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
1903 Type owntype = types.createErrorType(tree.type);
1904 if (operator.kind == MTH) {
1905 owntype = operator.type.getReturnType();
1906 int opc = chk.checkOperator(tree.lhs.pos(),
1907 (OperatorSymbol)operator,
1908 tree.getTag(),
1909 left,
1910 right);
1912 // If both arguments are constants, fold them.
1913 if (left.constValue() != null && right.constValue() != null) {
1914 Type ctype = cfolder.fold2(opc, left, right);
1915 if (ctype != null) {
1916 owntype = cfolder.coerce(ctype, owntype);
1918 // Remove constant types from arguments to
1919 // conserve space. The parser will fold concatenations
1920 // of string literals; the code here also
1921 // gets rid of intermediate results when some of the
1922 // operands are constant identifiers.
1923 if (tree.lhs.type.tsym == syms.stringType.tsym) {
1924 tree.lhs.type = syms.stringType;
1925 }
1926 if (tree.rhs.type.tsym == syms.stringType.tsym) {
1927 tree.rhs.type = syms.stringType;
1928 }
1929 }
1930 }
1932 // Check that argument types of a reference ==, != are
1933 // castable to each other, (JLS???).
1934 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
1935 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
1936 log.error(tree.pos(), "incomparable.types", left, right);
1937 }
1938 }
1940 chk.checkDivZero(tree.rhs.pos(), operator, right);
1941 }
1942 result = check(tree, owntype, VAL, pkind, pt);
1943 }
1945 public void visitTypeCast(JCTypeCast tree) {
1946 Type clazztype = attribType(tree.clazz, env);
1947 chk.validate(tree.clazz, env);
1948 Type exprtype = attribExpr(tree.expr, env, Infer.anyPoly);
1949 Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
1950 if (exprtype.constValue() != null)
1951 owntype = cfolder.coerce(exprtype, owntype);
1952 result = check(tree, capture(owntype), VAL, pkind, pt);
1953 }
1955 public void visitTypeTest(JCInstanceOf tree) {
1956 Type exprtype = chk.checkNullOrRefType(
1957 tree.expr.pos(), attribExpr(tree.expr, env));
1958 Type clazztype = chk.checkReifiableReferenceType(
1959 tree.clazz.pos(), attribType(tree.clazz, env));
1960 chk.validate(tree.clazz, env);
1961 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
1962 result = check(tree, syms.booleanType, VAL, pkind, pt);
1963 }
1965 public void visitIndexed(JCArrayAccess tree) {
1966 Type owntype = types.createErrorType(tree.type);
1967 Type atype = attribExpr(tree.indexed, env);
1968 attribExpr(tree.index, env, syms.intType);
1969 if (types.isArray(atype))
1970 owntype = types.elemtype(atype);
1971 else if (atype.tag != ERROR)
1972 log.error(tree.pos(), "array.req.but.found", atype);
1973 if ((pkind & VAR) == 0) owntype = capture(owntype);
1974 result = check(tree, owntype, VAR, pkind, pt);
1975 }
1977 public void visitIdent(JCIdent tree) {
1978 Symbol sym;
1979 boolean varArgs = false;
1981 // Find symbol
1982 if (pt.tag == METHOD || pt.tag == FORALL) {
1983 // If we are looking for a method, the prototype `pt' will be a
1984 // method type with the type of the call's arguments as parameters.
1985 env.info.varArgs = false;
1986 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments());
1987 varArgs = env.info.varArgs;
1988 } else if (tree.sym != null && tree.sym.kind != VAR) {
1989 sym = tree.sym;
1990 } else {
1991 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind);
1992 }
1993 tree.sym = sym;
1995 // (1) Also find the environment current for the class where
1996 // sym is defined (`symEnv').
1997 // Only for pre-tiger versions (1.4 and earlier):
1998 // (2) Also determine whether we access symbol out of an anonymous
1999 // class in a this or super call. This is illegal for instance
2000 // members since such classes don't carry a this$n link.
2001 // (`noOuterThisPath').
2002 Env<AttrContext> symEnv = env;
2003 boolean noOuterThisPath = false;
2004 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
2005 (sym.kind & (VAR | MTH | TYP)) != 0 &&
2006 sym.owner.kind == TYP &&
2007 tree.name != names._this && tree.name != names._super) {
2009 // Find environment in which identifier is defined.
2010 while (symEnv.outer != null &&
2011 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
2012 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
2013 noOuterThisPath = !allowAnonOuterThis;
2014 symEnv = symEnv.outer;
2015 }
2016 }
2018 // If symbol is a variable, ...
2019 if (sym.kind == VAR) {
2020 VarSymbol v = (VarSymbol)sym;
2022 // ..., evaluate its initializer, if it has one, and check for
2023 // illegal forward reference.
2024 checkInit(tree, env, v, false);
2026 // If symbol is a local variable accessed from an embedded
2027 // inner class check that it is final.
2028 if (v.owner.kind == MTH &&
2029 v.owner != env.info.scope.owner &&
2030 (v.flags_field & FINAL) == 0) {
2031 log.error(tree.pos(),
2032 "local.var.accessed.from.icls.needs.final",
2033 v);
2034 }
2036 // If we are expecting a variable (as opposed to a value), check
2037 // that the variable is assignable in the current environment.
2038 if (pkind == VAR)
2039 checkAssignable(tree.pos(), v, null, env);
2040 }
2042 // In a constructor body,
2043 // if symbol is a field or instance method, check that it is
2044 // not accessed before the supertype constructor is called.
2045 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
2046 (sym.kind & (VAR | MTH)) != 0 &&
2047 sym.owner.kind == TYP &&
2048 (sym.flags() & STATIC) == 0) {
2049 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
2050 }
2051 Env<AttrContext> env1 = env;
2052 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
2053 // If the found symbol is inaccessible, then it is
2054 // accessed through an enclosing instance. Locate this
2055 // enclosing instance:
2056 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
2057 env1 = env1.outer;
2058 }
2059 result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs);
2060 }
2062 public void visitSelect(JCFieldAccess tree) {
2063 // Determine the expected kind of the qualifier expression.
2064 int skind = 0;
2065 if (tree.name == names._this || tree.name == names._super ||
2066 tree.name == names._class)
2067 {
2068 skind = TYP;
2069 } else {
2070 if ((pkind & PCK) != 0) skind = skind | PCK;
2071 if ((pkind & TYP) != 0) skind = skind | TYP | PCK;
2072 if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
2073 }
2075 // Attribute the qualifier expression, and determine its symbol (if any).
2076 Type site = attribTree(tree.selected, env, skind, Infer.anyPoly);
2077 if ((pkind & (PCK | TYP)) == 0)
2078 site = capture(site); // Capture field access
2080 // don't allow T.class T[].class, etc
2081 if (skind == TYP) {
2082 Type elt = site;
2083 while (elt.tag == ARRAY)
2084 elt = ((ArrayType)elt).elemtype;
2085 if (elt.tag == TYPEVAR) {
2086 log.error(tree.pos(), "type.var.cant.be.deref");
2087 result = types.createErrorType(tree.type);
2088 return;
2089 }
2090 }
2092 // If qualifier symbol is a type or `super', assert `selectSuper'
2093 // for the selection. This is relevant for determining whether
2094 // protected symbols are accessible.
2095 Symbol sitesym = TreeInfo.symbol(tree.selected);
2096 boolean selectSuperPrev = env.info.selectSuper;
2097 env.info.selectSuper =
2098 sitesym != null &&
2099 sitesym.name == names._super;
2101 // If selected expression is polymorphic, strip
2102 // type parameters and remember in env.info.tvars, so that
2103 // they can be added later (in Attr.checkId and Infer.instantiateMethod).
2104 if (tree.selected.type.tag == FORALL) {
2105 ForAll pstype = (ForAll)tree.selected.type;
2106 env.info.tvars = pstype.tvars;
2107 site = tree.selected.type = pstype.qtype;
2108 }
2110 // Determine the symbol represented by the selection.
2111 env.info.varArgs = false;
2112 Symbol sym = selectSym(tree, site, env, pt, pkind);
2113 if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) {
2114 site = capture(site);
2115 sym = selectSym(tree, site, env, pt, pkind);
2116 }
2117 boolean varArgs = env.info.varArgs;
2118 tree.sym = sym;
2120 if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) {
2121 while (site.tag == TYPEVAR) site = site.getUpperBound();
2122 site = capture(site);
2123 }
2125 // If that symbol is a variable, ...
2126 if (sym.kind == VAR) {
2127 VarSymbol v = (VarSymbol)sym;
2129 // ..., evaluate its initializer, if it has one, and check for
2130 // illegal forward reference.
2131 checkInit(tree, env, v, true);
2133 // If we are expecting a variable (as opposed to a value), check
2134 // that the variable is assignable in the current environment.
2135 if (pkind == VAR)
2136 checkAssignable(tree.pos(), v, tree.selected, env);
2137 }
2139 // Disallow selecting a type from an expression
2140 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
2141 tree.type = check(tree.selected, pt,
2142 sitesym == null ? VAL : sitesym.kind, TYP|PCK, pt);
2143 }
2145 if (isType(sitesym)) {
2146 if (sym.name == names._this) {
2147 // If `C' is the currently compiled class, check that
2148 // C.this' does not appear in a call to a super(...)
2149 if (env.info.isSelfCall &&
2150 site.tsym == env.enclClass.sym) {
2151 chk.earlyRefError(tree.pos(), sym);
2152 }
2153 } else {
2154 // Check if type-qualified fields or methods are static (JLS)
2155 if ((sym.flags() & STATIC) == 0 &&
2156 sym.name != names._super &&
2157 (sym.kind == VAR || sym.kind == MTH)) {
2158 rs.access(rs.new StaticError(sym),
2159 tree.pos(), site, sym.name, true);
2160 }
2161 }
2162 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
2163 // If the qualified item is not a type and the selected item is static, report
2164 // a warning. Make allowance for the class of an array type e.g. Object[].class)
2165 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
2166 }
2168 // If we are selecting an instance member via a `super', ...
2169 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
2171 // Check that super-qualified symbols are not abstract (JLS)
2172 rs.checkNonAbstract(tree.pos(), sym);
2174 if (site.isRaw()) {
2175 // Determine argument types for site.
2176 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
2177 if (site1 != null) site = site1;
2178 }
2179 }
2181 env.info.selectSuper = selectSuperPrev;
2182 result = checkId(tree, site, sym, env, pkind, pt, varArgs);
2183 env.info.tvars = List.nil();
2184 }
2185 //where
2186 /** Determine symbol referenced by a Select expression,
2187 *
2188 * @param tree The select tree.
2189 * @param site The type of the selected expression,
2190 * @param env The current environment.
2191 * @param pt The current prototype.
2192 * @param pkind The expected kind(s) of the Select expression.
2193 */
2194 private Symbol selectSym(JCFieldAccess tree,
2195 Type site,
2196 Env<AttrContext> env,
2197 Type pt,
2198 int pkind) {
2199 DiagnosticPosition pos = tree.pos();
2200 Name name = tree.name;
2202 switch (site.tag) {
2203 case PACKAGE:
2204 return rs.access(
2205 rs.findIdentInPackage(env, site.tsym, name, pkind),
2206 pos, site, name, true);
2207 case ARRAY:
2208 case CLASS:
2209 if (pt.tag == METHOD || pt.tag == FORALL) {
2210 return rs.resolveQualifiedMethod(
2211 pos, env, site, name, pt.getParameterTypes(), pt.getTypeArguments());
2212 } else if (name == names._this || name == names._super) {
2213 return rs.resolveSelf(pos, env, site.tsym, name);
2214 } else if (name == names._class) {
2215 // In this case, we have already made sure in
2216 // visitSelect that qualifier expression is a type.
2217 Type t = syms.classType;
2218 List<Type> typeargs = allowGenerics
2219 ? List.of(types.erasure(site))
2220 : List.<Type>nil();
2221 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
2222 return new VarSymbol(
2223 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2224 } else {
2225 // We are seeing a plain identifier as selector.
2226 Symbol sym = rs.findIdentInType(env, site, name, pkind);
2227 if ((pkind & ERRONEOUS) == 0)
2228 sym = rs.access(sym, pos, site, name, true);
2229 return sym;
2230 }
2231 case WILDCARD:
2232 throw new AssertionError(tree);
2233 case TYPEVAR:
2234 // Normally, site.getUpperBound() shouldn't be null.
2235 // It should only happen during memberEnter/attribBase
2236 // when determining the super type which *must* be
2237 // done before attributing the type variables. In
2238 // other words, we are seeing this illegal program:
2239 // class B<T> extends A<T.foo> {}
2240 Symbol sym = (site.getUpperBound() != null)
2241 ? selectSym(tree, capture(site.getUpperBound()), env, pt, pkind)
2242 : null;
2243 if (sym == null) {
2244 log.error(pos, "type.var.cant.be.deref");
2245 return syms.errSymbol;
2246 } else {
2247 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
2248 rs.new AccessError(env, site, sym) :
2249 sym;
2250 rs.access(sym2, pos, site, name, true);
2251 return sym;
2252 }
2253 case ERROR:
2254 // preserve identifier names through errors
2255 return types.createErrorType(name, site.tsym, site).tsym;
2256 default:
2257 // The qualifier expression is of a primitive type -- only
2258 // .class is allowed for these.
2259 if (name == names._class) {
2260 // In this case, we have already made sure in Select that
2261 // qualifier expression is a type.
2262 Type t = syms.classType;
2263 Type arg = types.boxedClass(site).type;
2264 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
2265 return new VarSymbol(
2266 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2267 } else {
2268 log.error(pos, "cant.deref", site);
2269 return syms.errSymbol;
2270 }
2271 }
2272 }
2274 /** Determine type of identifier or select expression and check that
2275 * (1) the referenced symbol is not deprecated
2276 * (2) the symbol's type is safe (@see checkSafe)
2277 * (3) if symbol is a variable, check that its type and kind are
2278 * compatible with the prototype and protokind.
2279 * (4) if symbol is an instance field of a raw type,
2280 * which is being assigned to, issue an unchecked warning if its
2281 * type changes under erasure.
2282 * (5) if symbol is an instance method of a raw type, issue an
2283 * unchecked warning if its argument types change under erasure.
2284 * If checks succeed:
2285 * If symbol is a constant, return its constant type
2286 * else if symbol is a method, return its result type
2287 * otherwise return its type.
2288 * Otherwise return errType.
2289 *
2290 * @param tree The syntax tree representing the identifier
2291 * @param site If this is a select, the type of the selected
2292 * expression, otherwise the type of the current class.
2293 * @param sym The symbol representing the identifier.
2294 * @param env The current environment.
2295 * @param pkind The set of expected kinds.
2296 * @param pt The expected type.
2297 */
2298 Type checkId(JCTree tree,
2299 Type site,
2300 Symbol sym,
2301 Env<AttrContext> env,
2302 int pkind,
2303 Type pt,
2304 boolean useVarargs) {
2305 if (pt.isErroneous()) return types.createErrorType(site);
2306 Type owntype; // The computed type of this identifier occurrence.
2307 switch (sym.kind) {
2308 case TYP:
2309 // For types, the computed type equals the symbol's type,
2310 // except for two situations:
2311 owntype = sym.type;
2312 if (owntype.tag == CLASS) {
2313 Type ownOuter = owntype.getEnclosingType();
2315 // (a) If the symbol's type is parameterized, erase it
2316 // because no type parameters were given.
2317 // We recover generic outer type later in visitTypeApply.
2318 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
2319 owntype = types.erasure(owntype);
2320 }
2322 // (b) If the symbol's type is an inner class, then
2323 // we have to interpret its outer type as a superclass
2324 // of the site type. Example:
2325 //
2326 // class Tree<A> { class Visitor { ... } }
2327 // class PointTree extends Tree<Point> { ... }
2328 // ...PointTree.Visitor...
2329 //
2330 // Then the type of the last expression above is
2331 // Tree<Point>.Visitor.
2332 else if (ownOuter.tag == CLASS && site != ownOuter) {
2333 Type normOuter = site;
2334 if (normOuter.tag == CLASS)
2335 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
2336 if (normOuter == null) // perhaps from an import
2337 normOuter = types.erasure(ownOuter);
2338 if (normOuter != ownOuter)
2339 owntype = new ClassType(
2340 normOuter, List.<Type>nil(), owntype.tsym);
2341 }
2342 }
2343 break;
2344 case VAR:
2345 VarSymbol v = (VarSymbol)sym;
2346 // Test (4): if symbol is an instance field of a raw type,
2347 // which is being assigned to, issue an unchecked warning if
2348 // its type changes under erasure.
2349 if (allowGenerics &&
2350 pkind == VAR &&
2351 v.owner.kind == TYP &&
2352 (v.flags() & STATIC) == 0 &&
2353 (site.tag == CLASS || site.tag == TYPEVAR)) {
2354 Type s = types.asOuterSuper(site, v.owner);
2355 if (s != null &&
2356 s.isRaw() &&
2357 !types.isSameType(v.type, v.erasure(types))) {
2358 chk.warnUnchecked(tree.pos(),
2359 "unchecked.assign.to.var",
2360 v, s);
2361 }
2362 }
2363 // The computed type of a variable is the type of the
2364 // variable symbol, taken as a member of the site type.
2365 owntype = (sym.owner.kind == TYP &&
2366 sym.name != names._this && sym.name != names._super)
2367 ? types.memberType(site, sym)
2368 : sym.type;
2370 if (env.info.tvars.nonEmpty()) {
2371 Type owntype1 = new ForAll(env.info.tvars, owntype);
2372 for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail)
2373 if (!owntype.contains(l.head)) {
2374 log.error(tree.pos(), "undetermined.type", owntype1);
2375 owntype1 = types.createErrorType(owntype1);
2376 }
2377 owntype = owntype1;
2378 }
2380 // If the variable is a constant, record constant value in
2381 // computed type.
2382 if (v.getConstValue() != null && isStaticReference(tree))
2383 owntype = owntype.constType(v.getConstValue());
2385 if (pkind == VAL) {
2386 owntype = capture(owntype); // capture "names as expressions"
2387 }
2388 break;
2389 case MTH: {
2390 JCMethodInvocation app = (JCMethodInvocation)env.tree;
2391 owntype = checkMethod(site, sym, env, app.args,
2392 pt.getParameterTypes(), pt.getTypeArguments(),
2393 env.info.varArgs);
2394 break;
2395 }
2396 case PCK: case ERR:
2397 owntype = sym.type;
2398 break;
2399 default:
2400 throw new AssertionError("unexpected kind: " + sym.kind +
2401 " in tree " + tree);
2402 }
2404 // Test (1): emit a `deprecation' warning if symbol is deprecated.
2405 // (for constructors, the error was given when the constructor was
2406 // resolved)
2407 if (sym.name != names.init &&
2408 (sym.flags() & DEPRECATED) != 0 &&
2409 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
2410 sym.outermostClass() != env.info.scope.owner.outermostClass())
2411 chk.warnDeprecated(tree.pos(), sym);
2413 if ((sym.flags() & PROPRIETARY) != 0) {
2414 if (enableSunApiLintControl)
2415 chk.warnSunApi(tree.pos(), "sun.proprietary", sym);
2416 else
2417 log.strictWarning(tree.pos(), "sun.proprietary", sym);
2418 }
2420 // Test (3): if symbol is a variable, check that its type and
2421 // kind are compatible with the prototype and protokind.
2422 return check(tree, owntype, sym.kind, pkind, pt);
2423 }
2425 /** Check that variable is initialized and evaluate the variable's
2426 * initializer, if not yet done. Also check that variable is not
2427 * referenced before it is defined.
2428 * @param tree The tree making up the variable reference.
2429 * @param env The current environment.
2430 * @param v The variable's symbol.
2431 */
2432 private void checkInit(JCTree tree,
2433 Env<AttrContext> env,
2434 VarSymbol v,
2435 boolean onlyWarning) {
2436 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
2437 // tree.pos + " " + v.pos + " " +
2438 // Resolve.isStatic(env));//DEBUG
2440 // A forward reference is diagnosed if the declaration position
2441 // of the variable is greater than the current tree position
2442 // and the tree and variable definition occur in the same class
2443 // definition. Note that writes don't count as references.
2444 // This check applies only to class and instance
2445 // variables. Local variables follow different scope rules,
2446 // and are subject to definite assignment checking.
2447 if ((env.info.enclVar == v || v.pos > tree.pos) &&
2448 v.owner.kind == TYP &&
2449 canOwnInitializer(env.info.scope.owner) &&
2450 v.owner == env.info.scope.owner.enclClass() &&
2451 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
2452 (env.tree.getTag() != JCTree.ASSIGN ||
2453 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
2454 String suffix = (env.info.enclVar == v) ?
2455 "self.ref" : "forward.ref";
2456 if (!onlyWarning || isStaticEnumField(v)) {
2457 log.error(tree.pos(), "illegal." + suffix);
2458 } else if (useBeforeDeclarationWarning) {
2459 log.warning(tree.pos(), suffix, v);
2460 }
2461 }
2463 v.getConstValue(); // ensure initializer is evaluated
2465 checkEnumInitializer(tree, env, v);
2466 }
2468 /**
2469 * Check for illegal references to static members of enum. In
2470 * an enum type, constructors and initializers may not
2471 * reference its static members unless they are constant.
2472 *
2473 * @param tree The tree making up the variable reference.
2474 * @param env The current environment.
2475 * @param v The variable's symbol.
2476 * @see JLS 3rd Ed. (8.9 Enums)
2477 */
2478 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
2479 // JLS 3rd Ed.:
2480 //
2481 // "It is a compile-time error to reference a static field
2482 // of an enum type that is not a compile-time constant
2483 // (15.28) from constructors, instance initializer blocks,
2484 // or instance variable initializer expressions of that
2485 // type. It is a compile-time error for the constructors,
2486 // instance initializer blocks, or instance variable
2487 // initializer expressions of an enum constant e to refer
2488 // to itself or to an enum constant of the same type that
2489 // is declared to the right of e."
2490 if (isStaticEnumField(v)) {
2491 ClassSymbol enclClass = env.info.scope.owner.enclClass();
2493 if (enclClass == null || enclClass.owner == null)
2494 return;
2496 // See if the enclosing class is the enum (or a
2497 // subclass thereof) declaring v. If not, this
2498 // reference is OK.
2499 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
2500 return;
2502 // If the reference isn't from an initializer, then
2503 // the reference is OK.
2504 if (!Resolve.isInitializer(env))
2505 return;
2507 log.error(tree.pos(), "illegal.enum.static.ref");
2508 }
2509 }
2511 /** Is the given symbol a static, non-constant field of an Enum?
2512 * Note: enum literals should not be regarded as such
2513 */
2514 private boolean isStaticEnumField(VarSymbol v) {
2515 return Flags.isEnum(v.owner) &&
2516 Flags.isStatic(v) &&
2517 !Flags.isConstant(v) &&
2518 v.name != names._class;
2519 }
2521 /** Can the given symbol be the owner of code which forms part
2522 * if class initialization? This is the case if the symbol is
2523 * a type or field, or if the symbol is the synthetic method.
2524 * owning a block.
2525 */
2526 private boolean canOwnInitializer(Symbol sym) {
2527 return
2528 (sym.kind & (VAR | TYP)) != 0 ||
2529 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
2530 }
2532 Warner noteWarner = new Warner();
2534 /**
2535 * Check that method arguments conform to its instantation.
2536 **/
2537 public Type checkMethod(Type site,
2538 Symbol sym,
2539 Env<AttrContext> env,
2540 final List<JCExpression> argtrees,
2541 List<Type> argtypes,
2542 List<Type> typeargtypes,
2543 boolean useVarargs) {
2544 // Test (5): if symbol is an instance method of a raw type, issue
2545 // an unchecked warning if its argument types change under erasure.
2546 if (allowGenerics &&
2547 (sym.flags() & STATIC) == 0 &&
2548 (site.tag == CLASS || site.tag == TYPEVAR)) {
2549 Type s = types.asOuterSuper(site, sym.owner);
2550 if (s != null && s.isRaw() &&
2551 !types.isSameTypes(sym.type.getParameterTypes(),
2552 sym.erasure(types).getParameterTypes())) {
2553 chk.warnUnchecked(env.tree.pos(),
2554 "unchecked.call.mbr.of.raw.type",
2555 sym, s);
2556 }
2557 }
2559 // Compute the identifier's instantiated type.
2560 // For methods, we need to compute the instance type by
2561 // Resolve.instantiate from the symbol's type as well as
2562 // any type arguments and value arguments.
2563 noteWarner.warned = false;
2564 Type owntype = rs.instantiate(env,
2565 site,
2566 sym,
2567 argtypes,
2568 typeargtypes,
2569 true,
2570 useVarargs,
2571 noteWarner);
2572 boolean warned = noteWarner.warned;
2574 // If this fails, something went wrong; we should not have
2575 // found the identifier in the first place.
2576 if (owntype == null) {
2577 if (!pt.isErroneous())
2578 log.error(env.tree.pos(),
2579 "internal.error.cant.instantiate",
2580 sym, site,
2581 Type.toString(pt.getParameterTypes()));
2582 owntype = types.createErrorType(site);
2583 } else {
2584 // System.out.println("call : " + env.tree);
2585 // System.out.println("method : " + owntype);
2586 // System.out.println("actuals: " + argtypes);
2587 List<Type> formals = owntype.getParameterTypes();
2588 Type last = useVarargs ? formals.last() : null;
2589 if (sym.name==names.init &&
2590 sym.owner == syms.enumSym)
2591 formals = formals.tail.tail;
2592 List<JCExpression> args = argtrees;
2593 while (formals.head != last) {
2594 JCTree arg = args.head;
2595 Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head);
2596 assertConvertible(arg, arg.type, formals.head, warn);
2597 warned |= warn.warned;
2598 args = args.tail;
2599 formals = formals.tail;
2600 }
2601 if (useVarargs) {
2602 Type varArg = types.elemtype(last);
2603 while (args.tail != null) {
2604 JCTree arg = args.head;
2605 Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg);
2606 assertConvertible(arg, arg.type, varArg, warn);
2607 warned |= warn.warned;
2608 args = args.tail;
2609 }
2610 } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) {
2611 // non-varargs call to varargs method
2612 Type varParam = owntype.getParameterTypes().last();
2613 Type lastArg = argtypes.last();
2614 if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) &&
2615 !types.isSameType(types.erasure(varParam), types.erasure(lastArg)))
2616 log.warning(argtrees.last().pos(), "inexact.non-varargs.call",
2617 types.elemtype(varParam),
2618 varParam);
2619 }
2621 if (warned && sym.type.tag == FORALL) {
2622 chk.warnUnchecked(env.tree.pos(),
2623 "unchecked.meth.invocation.applied",
2624 kindName(sym),
2625 sym.name,
2626 rs.methodArguments(sym.type.getParameterTypes()),
2627 rs.methodArguments(argtypes),
2628 kindName(sym.location()),
2629 sym.location());
2630 owntype = new MethodType(owntype.getParameterTypes(),
2631 types.erasure(owntype.getReturnType()),
2632 owntype.getThrownTypes(),
2633 syms.methodClass);
2634 }
2635 if (useVarargs) {
2636 JCTree tree = env.tree;
2637 if (owntype.getReturnType().tag != FORALL || warned) {
2638 chk.checkVararg(env.tree.pos(), owntype.getParameterTypes());
2639 }
2640 Type elemtype = types.elemtype(owntype.getParameterTypes().last());
2641 switch (tree.getTag()) {
2642 case JCTree.APPLY:
2643 ((JCMethodInvocation) tree).varargsElement = elemtype;
2644 break;
2645 case JCTree.NEWCLASS:
2646 ((JCNewClass) tree).varargsElement = elemtype;
2647 break;
2648 default:
2649 throw new AssertionError(""+tree);
2650 }
2651 }
2652 }
2653 return owntype;
2654 }
2656 private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) {
2657 if (types.isConvertible(actual, formal, warn))
2658 return;
2660 if (formal.isCompound()
2661 && types.isSubtype(actual, types.supertype(formal))
2662 && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn))
2663 return;
2665 if (false) {
2666 // TODO: make assertConvertible work
2667 chk.typeError(tree.pos(), diags.fragment("incompatible.types"), actual, formal);
2668 throw new AssertionError("Tree: " + tree
2669 + " actual:" + actual
2670 + " formal: " + formal);
2671 }
2672 }
2674 public void visitLiteral(JCLiteral tree) {
2675 result = check(
2676 tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt);
2677 }
2678 //where
2679 /** Return the type of a literal with given type tag.
2680 */
2681 Type litType(int tag) {
2682 return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag];
2683 }
2685 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
2686 result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt);
2687 }
2689 public void visitTypeArray(JCArrayTypeTree tree) {
2690 Type etype = attribType(tree.elemtype, env);
2691 Type type = new ArrayType(etype, syms.arrayClass);
2692 result = check(tree, type, TYP, pkind, pt);
2693 }
2695 /** Visitor method for parameterized types.
2696 * Bound checking is left until later, since types are attributed
2697 * before supertype structure is completely known
2698 */
2699 public void visitTypeApply(JCTypeApply tree) {
2700 Type owntype = types.createErrorType(tree.type);
2702 // Attribute functor part of application and make sure it's a class.
2703 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
2705 // Attribute type parameters
2706 List<Type> actuals = attribTypes(tree.arguments, env);
2708 if (clazztype.tag == CLASS) {
2709 List<Type> formals = clazztype.tsym.type.getTypeArguments();
2711 if (actuals.length() == formals.length() || actuals.length() == 0) {
2712 List<Type> a = actuals;
2713 List<Type> f = formals;
2714 while (a.nonEmpty()) {
2715 a.head = a.head.withTypeVar(f.head);
2716 a = a.tail;
2717 f = f.tail;
2718 }
2719 // Compute the proper generic outer
2720 Type clazzOuter = clazztype.getEnclosingType();
2721 if (clazzOuter.tag == CLASS) {
2722 Type site;
2723 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
2724 if (clazz.getTag() == JCTree.IDENT) {
2725 site = env.enclClass.sym.type;
2726 } else if (clazz.getTag() == JCTree.SELECT) {
2727 site = ((JCFieldAccess) clazz).selected.type;
2728 } else throw new AssertionError(""+tree);
2729 if (clazzOuter.tag == CLASS && site != clazzOuter) {
2730 if (site.tag == CLASS)
2731 site = types.asOuterSuper(site, clazzOuter.tsym);
2732 if (site == null)
2733 site = types.erasure(clazzOuter);
2734 clazzOuter = site;
2735 }
2736 }
2737 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
2738 } else {
2739 if (formals.length() != 0) {
2740 log.error(tree.pos(), "wrong.number.type.args",
2741 Integer.toString(formals.length()));
2742 } else {
2743 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
2744 }
2745 owntype = types.createErrorType(tree.type);
2746 }
2747 }
2748 result = check(tree, owntype, TYP, pkind, pt);
2749 }
2751 public void visitTypeDisjoint(JCTypeDisjoint tree) {
2752 List<Type> componentTypes = attribTypes(tree.components, env);
2753 tree.type = result = check(tree, types.lub(componentTypes), TYP, pkind, pt);
2754 }
2756 public void visitTypeParameter(JCTypeParameter tree) {
2757 TypeVar a = (TypeVar)tree.type;
2758 Set<Type> boundSet = new HashSet<Type>();
2759 if (a.bound.isErroneous())
2760 return;
2761 List<Type> bs = types.getBounds(a);
2762 if (tree.bounds.nonEmpty()) {
2763 // accept class or interface or typevar as first bound.
2764 Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false);
2765 boundSet.add(types.erasure(b));
2766 if (b.isErroneous()) {
2767 a.bound = b;
2768 }
2769 else if (b.tag == TYPEVAR) {
2770 // if first bound was a typevar, do not accept further bounds.
2771 if (tree.bounds.tail.nonEmpty()) {
2772 log.error(tree.bounds.tail.head.pos(),
2773 "type.var.may.not.be.followed.by.other.bounds");
2774 log.unrecoverableError = true;
2775 tree.bounds = List.of(tree.bounds.head);
2776 a.bound = bs.head;
2777 }
2778 } else {
2779 // if first bound was a class or interface, accept only interfaces
2780 // as further bounds.
2781 for (JCExpression bound : tree.bounds.tail) {
2782 bs = bs.tail;
2783 Type i = checkBase(bs.head, bound, env, false, true, false);
2784 if (i.isErroneous())
2785 a.bound = i;
2786 else if (i.tag == CLASS)
2787 chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet);
2788 }
2789 }
2790 }
2791 bs = types.getBounds(a);
2793 // in case of multiple bounds ...
2794 if (bs.length() > 1) {
2795 // ... the variable's bound is a class type flagged COMPOUND
2796 // (see comment for TypeVar.bound).
2797 // In this case, generate a class tree that represents the
2798 // bound class, ...
2799 JCTree extending;
2800 List<JCExpression> implementing;
2801 if ((bs.head.tsym.flags() & INTERFACE) == 0) {
2802 extending = tree.bounds.head;
2803 implementing = tree.bounds.tail;
2804 } else {
2805 extending = null;
2806 implementing = tree.bounds;
2807 }
2808 JCClassDecl cd = make.at(tree.pos).ClassDef(
2809 make.Modifiers(PUBLIC | ABSTRACT),
2810 tree.name, List.<JCTypeParameter>nil(),
2811 extending, implementing, List.<JCTree>nil());
2813 ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym;
2814 assert (c.flags() & COMPOUND) != 0;
2815 cd.sym = c;
2816 c.sourcefile = env.toplevel.sourcefile;
2818 // ... and attribute the bound class
2819 c.flags_field |= UNATTRIBUTED;
2820 Env<AttrContext> cenv = enter.classEnv(cd, env);
2821 enter.typeEnvs.put(c, cenv);
2822 }
2823 }
2826 public void visitWildcard(JCWildcard tree) {
2827 //- System.err.println("visitWildcard("+tree+");");//DEBUG
2828 Type type = (tree.kind.kind == BoundKind.UNBOUND)
2829 ? syms.objectType
2830 : attribType(tree.inner, env);
2831 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
2832 tree.kind.kind,
2833 syms.boundClass),
2834 TYP, pkind, pt);
2835 }
2837 public void visitAnnotation(JCAnnotation tree) {
2838 log.error(tree.pos(), "annotation.not.valid.for.type", pt);
2839 result = tree.type = syms.errType;
2840 }
2842 public void visitAnnotatedType(JCAnnotatedType tree) {
2843 result = tree.type = attribType(tree.getUnderlyingType(), env);
2844 }
2846 public void visitErroneous(JCErroneous tree) {
2847 if (tree.errs != null)
2848 for (JCTree err : tree.errs)
2849 attribTree(err, env, ERR, pt);
2850 result = tree.type = syms.errType;
2851 }
2853 /** Default visitor method for all other trees.
2854 */
2855 public void visitTree(JCTree tree) {
2856 throw new AssertionError();
2857 }
2859 /** Main method: attribute class definition associated with given class symbol.
2860 * reporting completion failures at the given position.
2861 * @param pos The source position at which completion errors are to be
2862 * reported.
2863 * @param c The class symbol whose definition will be attributed.
2864 */
2865 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
2866 try {
2867 annotate.flush();
2868 attribClass(c);
2869 } catch (CompletionFailure ex) {
2870 chk.completionError(pos, ex);
2871 }
2872 }
2874 /** Attribute class definition associated with given class symbol.
2875 * @param c The class symbol whose definition will be attributed.
2876 */
2877 void attribClass(ClassSymbol c) throws CompletionFailure {
2878 if (c.type.tag == ERROR) return;
2880 // Check for cycles in the inheritance graph, which can arise from
2881 // ill-formed class files.
2882 chk.checkNonCyclic(null, c.type);
2884 Type st = types.supertype(c.type);
2885 if ((c.flags_field & Flags.COMPOUND) == 0) {
2886 // First, attribute superclass.
2887 if (st.tag == CLASS)
2888 attribClass((ClassSymbol)st.tsym);
2890 // Next attribute owner, if it is a class.
2891 if (c.owner.kind == TYP && c.owner.type.tag == CLASS)
2892 attribClass((ClassSymbol)c.owner);
2893 }
2895 // The previous operations might have attributed the current class
2896 // if there was a cycle. So we test first whether the class is still
2897 // UNATTRIBUTED.
2898 if ((c.flags_field & UNATTRIBUTED) != 0) {
2899 c.flags_field &= ~UNATTRIBUTED;
2901 // Get environment current at the point of class definition.
2902 Env<AttrContext> env = enter.typeEnvs.get(c);
2904 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
2905 // because the annotations were not available at the time the env was created. Therefore,
2906 // we look up the environment chain for the first enclosing environment for which the
2907 // lint value is set. Typically, this is the parent env, but might be further if there
2908 // are any envs created as a result of TypeParameter nodes.
2909 Env<AttrContext> lintEnv = env;
2910 while (lintEnv.info.lint == null)
2911 lintEnv = lintEnv.next;
2913 // Having found the enclosing lint value, we can initialize the lint value for this class
2914 env.info.lint = lintEnv.info.lint.augment(c.attributes_field, c.flags());
2916 Lint prevLint = chk.setLint(env.info.lint);
2917 JavaFileObject prev = log.useSource(c.sourcefile);
2919 try {
2920 // java.lang.Enum may not be subclassed by a non-enum
2921 if (st.tsym == syms.enumSym &&
2922 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
2923 log.error(env.tree.pos(), "enum.no.subclassing");
2925 // Enums may not be extended by source-level classes
2926 if (st.tsym != null &&
2927 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
2928 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
2929 !target.compilerBootstrap(c)) {
2930 log.error(env.tree.pos(), "enum.types.not.extensible");
2931 }
2932 attribClassBody(env, c);
2934 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
2935 } finally {
2936 log.useSource(prev);
2937 chk.setLint(prevLint);
2938 }
2940 }
2941 }
2943 public void visitImport(JCImport tree) {
2944 // nothing to do
2945 }
2947 /** Finish the attribution of a class. */
2948 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
2949 JCClassDecl tree = (JCClassDecl)env.tree;
2950 assert c == tree.sym;
2952 // Validate annotations
2953 chk.validateAnnotations(tree.mods.annotations, c);
2955 // Validate type parameters, supertype and interfaces.
2956 attribBounds(tree.typarams);
2957 if (!c.isAnonymous()) {
2958 //already checked if anonymous
2959 chk.validate(tree.typarams, env);
2960 chk.validate(tree.extending, env);
2961 chk.validate(tree.implementing, env);
2962 }
2964 // If this is a non-abstract class, check that it has no abstract
2965 // methods or unimplemented methods of an implemented interface.
2966 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
2967 if (!relax)
2968 chk.checkAllDefined(tree.pos(), c);
2969 }
2971 if ((c.flags() & ANNOTATION) != 0) {
2972 if (tree.implementing.nonEmpty())
2973 log.error(tree.implementing.head.pos(),
2974 "cant.extend.intf.annotation");
2975 if (tree.typarams.nonEmpty())
2976 log.error(tree.typarams.head.pos(),
2977 "intf.annotation.cant.have.type.params");
2978 } else {
2979 // Check that all extended classes and interfaces
2980 // are compatible (i.e. no two define methods with same arguments
2981 // yet different return types). (JLS 8.4.6.3)
2982 chk.checkCompatibleSupertypes(tree.pos(), c.type);
2983 }
2985 // Check that class does not import the same parameterized interface
2986 // with two different argument lists.
2987 chk.checkClassBounds(tree.pos(), c.type);
2989 tree.type = c.type;
2991 boolean assertsEnabled = false;
2992 assert assertsEnabled = true;
2993 if (assertsEnabled) {
2994 for (List<JCTypeParameter> l = tree.typarams;
2995 l.nonEmpty(); l = l.tail)
2996 assert env.info.scope.lookup(l.head.name).scope != null;
2997 }
2999 // Check that a generic class doesn't extend Throwable
3000 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
3001 log.error(tree.extending.pos(), "generic.throwable");
3003 // Check that all methods which implement some
3004 // method conform to the method they implement.
3005 chk.checkImplementations(tree);
3007 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
3008 // Attribute declaration
3009 attribStat(l.head, env);
3010 // Check that declarations in inner classes are not static (JLS 8.1.2)
3011 // Make an exception for static constants.
3012 if (c.owner.kind != PCK &&
3013 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
3014 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
3015 Symbol sym = null;
3016 if (l.head.getTag() == JCTree.VARDEF) sym = ((JCVariableDecl) l.head).sym;
3017 if (sym == null ||
3018 sym.kind != VAR ||
3019 ((VarSymbol) sym).getConstValue() == null)
3020 log.error(l.head.pos(), "icls.cant.have.static.decl");
3021 }
3022 }
3024 // Check for cycles among non-initial constructors.
3025 chk.checkCyclicConstructors(tree);
3027 // Check for cycles among annotation elements.
3028 chk.checkNonCyclicElements(tree);
3030 // Check for proper use of serialVersionUID
3031 if (env.info.lint.isEnabled(Lint.LintCategory.SERIAL) &&
3032 isSerializable(c) &&
3033 (c.flags() & Flags.ENUM) == 0 &&
3034 (c.flags() & ABSTRACT) == 0) {
3035 checkSerialVersionUID(tree, c);
3036 }
3038 // Check type annotations applicability rules
3039 validateTypeAnnotations(tree);
3040 }
3041 // where
3042 /** check if a class is a subtype of Serializable, if that is available. */
3043 private boolean isSerializable(ClassSymbol c) {
3044 try {
3045 syms.serializableType.complete();
3046 }
3047 catch (CompletionFailure e) {
3048 return false;
3049 }
3050 return types.isSubtype(c.type, syms.serializableType);
3051 }
3053 /** Check that an appropriate serialVersionUID member is defined. */
3054 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
3056 // check for presence of serialVersionUID
3057 Scope.Entry e = c.members().lookup(names.serialVersionUID);
3058 while (e.scope != null && e.sym.kind != VAR) e = e.next();
3059 if (e.scope == null) {
3060 log.warning(tree.pos(), "missing.SVUID", c);
3061 return;
3062 }
3064 // check that it is static final
3065 VarSymbol svuid = (VarSymbol)e.sym;
3066 if ((svuid.flags() & (STATIC | FINAL)) !=
3067 (STATIC | FINAL))
3068 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
3070 // check that it is long
3071 else if (svuid.type.tag != TypeTags.LONG)
3072 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
3074 // check constant
3075 else if (svuid.getConstValue() == null)
3076 log.warning(TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
3077 }
3079 private Type capture(Type type) {
3080 return types.capture(type);
3081 }
3083 private void validateTypeAnnotations(JCTree tree) {
3084 tree.accept(typeAnnotationsValidator);
3085 }
3086 //where
3087 private final JCTree.Visitor typeAnnotationsValidator =
3088 new TreeScanner() {
3089 public void visitAnnotation(JCAnnotation tree) {
3090 if (tree instanceof JCTypeAnnotation) {
3091 chk.validateTypeAnnotation((JCTypeAnnotation)tree, false);
3092 }
3093 super.visitAnnotation(tree);
3094 }
3095 public void visitTypeParameter(JCTypeParameter tree) {
3096 chk.validateTypeAnnotations(tree.annotations, true);
3097 // don't call super. skip type annotations
3098 scan(tree.bounds);
3099 }
3100 public void visitMethodDef(JCMethodDecl tree) {
3101 // need to check static methods
3102 if ((tree.sym.flags() & Flags.STATIC) != 0) {
3103 for (JCTypeAnnotation a : tree.receiverAnnotations) {
3104 if (chk.isTypeAnnotation(a, false))
3105 log.error(a.pos(), "annotation.type.not.applicable");
3106 }
3107 }
3108 super.visitMethodDef(tree);
3109 }
3110 };
3111 }
