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src/share/classes/com/sun/tools/javac/comp/Attr.java@584365f256a7
src/share/classes/com/sun/tools/javac/comp/Attr.java
Tue, 07 Sep 2010 17:32:27 +0100
- author
- mcimadamore
- date
- Tue, 07 Sep 2010 17:32:27 +0100
- changeset 674
- 584365f256a7
- parent 669
- d54300fb3554
- child 676
- bfdfc13fe641
- permissions
- -rw-r--r--
6979327: method handle invocation should use casts instead of type parameters to specify return type
Summary: infer return type for polymorphic signature calls according to updated JSR 292 draft
Reviewed-by: jjg
Contributed-by: john.r.rose@oracle.com
1 /*
2 * Copyright (c) 1999, 2009, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
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 supported API.
63 * If you write code that depends on this, you do so at your own risk.
64 * This code and its internal interfaces are subject to change or
65 * deletion without notice.</b>
66 */
67 public class Attr extends JCTree.Visitor {
68 protected static final Context.Key<Attr> attrKey =
69 new Context.Key<Attr>();
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 enableSunApiLintControl = options.get("enableSunApiLintControl") != null;
126 }
128 /** Switch: relax some constraints for retrofit mode.
129 */
130 boolean relax;
132 /** Switch: support generics?
133 */
134 boolean allowGenerics;
136 /** Switch: allow variable-arity methods.
137 */
138 boolean allowVarargs;
140 /** Switch: support enums?
141 */
142 boolean allowEnums;
144 /** Switch: support boxing and unboxing?
145 */
146 boolean allowBoxing;
148 /** Switch: support covariant result types?
149 */
150 boolean allowCovariantReturns;
152 /** Switch: allow references to surrounding object from anonymous
153 * objects during constructor call?
154 */
155 boolean allowAnonOuterThis;
157 /**
158 * Switch: warn about use of variable before declaration?
159 * RFE: 6425594
160 */
161 boolean useBeforeDeclarationWarning;
163 /**
164 * Switch: allow lint infrastructure to control proprietary
165 * API warnings.
166 */
167 boolean enableSunApiLintControl;
169 /**
170 * Switch: allow strings in switch?
171 */
172 boolean allowStringsInSwitch;
174 /**
175 * Switch: name of source level; used for error reporting.
176 */
177 String sourceName;
179 /** Check kind and type of given tree against protokind and prototype.
180 * If check succeeds, store type in tree and return it.
181 * If check fails, store errType in tree and return it.
182 * No checks are performed if the prototype is a method type.
183 * It is not necessary in this case since we know that kind and type
184 * are correct.
185 *
186 * @param tree The tree whose kind and type is checked
187 * @param owntype The computed type of the tree
188 * @param ownkind The computed kind of the tree
189 * @param pkind The expected kind (or: protokind) of the tree
190 * @param pt The expected type (or: prototype) of the tree
191 */
192 Type check(JCTree tree, Type owntype, int ownkind, int pkind, Type pt) {
193 if (owntype.tag != ERROR && pt.tag != METHOD && pt.tag != FORALL) {
194 if ((ownkind & ~pkind) == 0) {
195 owntype = chk.checkType(tree.pos(), owntype, pt, errKey);
196 } else {
197 log.error(tree.pos(), "unexpected.type",
198 kindNames(pkind),
199 kindName(ownkind));
200 owntype = types.createErrorType(owntype);
201 }
202 }
203 tree.type = owntype;
204 return owntype;
205 }
207 /** Is given blank final variable assignable, i.e. in a scope where it
208 * may be assigned to even though it is final?
209 * @param v The blank final variable.
210 * @param env The current environment.
211 */
212 boolean isAssignableAsBlankFinal(VarSymbol v, Env<AttrContext> env) {
213 Symbol owner = env.info.scope.owner;
214 // owner refers to the innermost variable, method or
215 // initializer block declaration at this point.
216 return
217 v.owner == owner
218 ||
219 ((owner.name == names.init || // i.e. we are in a constructor
220 owner.kind == VAR || // i.e. we are in a variable initializer
221 (owner.flags() & BLOCK) != 0) // i.e. we are in an initializer block
222 &&
223 v.owner == owner.owner
224 &&
225 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env));
226 }
228 /** Check that variable can be assigned to.
229 * @param pos The current source code position.
230 * @param v The assigned varaible
231 * @param base If the variable is referred to in a Select, the part
232 * to the left of the `.', null otherwise.
233 * @param env The current environment.
234 */
235 void checkAssignable(DiagnosticPosition pos, VarSymbol v, JCTree base, Env<AttrContext> env) {
236 if ((v.flags() & FINAL) != 0 &&
237 ((v.flags() & HASINIT) != 0
238 ||
239 !((base == null ||
240 (base.getTag() == JCTree.IDENT && TreeInfo.name(base) == names._this)) &&
241 isAssignableAsBlankFinal(v, env)))) {
242 if (v.isResourceVariable()) { //TWR resource
243 log.error(pos, "twr.resource.may.not.be.assigned", v);
244 } else {
245 log.error(pos, "cant.assign.val.to.final.var", v);
246 }
247 }
248 }
250 /** Does tree represent a static reference to an identifier?
251 * It is assumed that tree is either a SELECT or an IDENT.
252 * We have to weed out selects from non-type names here.
253 * @param tree The candidate tree.
254 */
255 boolean isStaticReference(JCTree tree) {
256 if (tree.getTag() == JCTree.SELECT) {
257 Symbol lsym = TreeInfo.symbol(((JCFieldAccess) tree).selected);
258 if (lsym == null || lsym.kind != TYP) {
259 return false;
260 }
261 }
262 return true;
263 }
265 /** Is this symbol a type?
266 */
267 static boolean isType(Symbol sym) {
268 return sym != null && sym.kind == TYP;
269 }
271 /** The current `this' symbol.
272 * @param env The current environment.
273 */
274 Symbol thisSym(DiagnosticPosition pos, Env<AttrContext> env) {
275 return rs.resolveSelf(pos, env, env.enclClass.sym, names._this);
276 }
278 /** Attribute a parsed identifier.
279 * @param tree Parsed identifier name
280 * @param topLevel The toplevel to use
281 */
282 public Symbol attribIdent(JCTree tree, JCCompilationUnit topLevel) {
283 Env<AttrContext> localEnv = enter.topLevelEnv(topLevel);
284 localEnv.enclClass = make.ClassDef(make.Modifiers(0),
285 syms.errSymbol.name,
286 null, null, null, null);
287 localEnv.enclClass.sym = syms.errSymbol;
288 return tree.accept(identAttributer, localEnv);
289 }
290 // where
291 private TreeVisitor<Symbol,Env<AttrContext>> identAttributer = new IdentAttributer();
292 private class IdentAttributer extends SimpleTreeVisitor<Symbol,Env<AttrContext>> {
293 @Override
294 public Symbol visitMemberSelect(MemberSelectTree node, Env<AttrContext> env) {
295 Symbol site = visit(node.getExpression(), env);
296 if (site.kind == ERR)
297 return site;
298 Name name = (Name)node.getIdentifier();
299 if (site.kind == PCK) {
300 env.toplevel.packge = (PackageSymbol)site;
301 return rs.findIdentInPackage(env, (TypeSymbol)site, name, TYP | PCK);
302 } else {
303 env.enclClass.sym = (ClassSymbol)site;
304 return rs.findMemberType(env, site.asType(), name, (TypeSymbol)site);
305 }
306 }
308 @Override
309 public Symbol visitIdentifier(IdentifierTree node, Env<AttrContext> env) {
310 return rs.findIdent(env, (Name)node.getName(), TYP | PCK);
311 }
312 }
314 public Type coerce(Type etype, Type ttype) {
315 return cfolder.coerce(etype, ttype);
316 }
318 public Type attribType(JCTree node, TypeSymbol sym) {
319 Env<AttrContext> env = enter.typeEnvs.get(sym);
320 Env<AttrContext> localEnv = env.dup(node, env.info.dup());
321 return attribTree(node, localEnv, Kinds.TYP, Type.noType);
322 }
324 public Env<AttrContext> attribExprToTree(JCTree expr, Env<AttrContext> env, JCTree tree) {
325 breakTree = tree;
326 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
327 try {
328 attribExpr(expr, env);
329 } catch (BreakAttr b) {
330 return b.env;
331 } catch (AssertionError ae) {
332 if (ae.getCause() instanceof BreakAttr) {
333 return ((BreakAttr)(ae.getCause())).env;
334 } else {
335 throw ae;
336 }
337 } finally {
338 breakTree = null;
339 log.useSource(prev);
340 }
341 return env;
342 }
344 public Env<AttrContext> attribStatToTree(JCTree stmt, Env<AttrContext> env, JCTree tree) {
345 breakTree = tree;
346 JavaFileObject prev = log.useSource(env.toplevel.sourcefile);
347 try {
348 attribStat(stmt, env);
349 } catch (BreakAttr b) {
350 return b.env;
351 } catch (AssertionError ae) {
352 if (ae.getCause() instanceof BreakAttr) {
353 return ((BreakAttr)(ae.getCause())).env;
354 } else {
355 throw ae;
356 }
357 } finally {
358 breakTree = null;
359 log.useSource(prev);
360 }
361 return env;
362 }
364 private JCTree breakTree = null;
366 private static class BreakAttr extends RuntimeException {
367 static final long serialVersionUID = -6924771130405446405L;
368 private Env<AttrContext> env;
369 private BreakAttr(Env<AttrContext> env) {
370 this.env = env;
371 }
372 }
375 /* ************************************************************************
376 * Visitor methods
377 *************************************************************************/
379 /** Visitor argument: the current environment.
380 */
381 Env<AttrContext> env;
383 /** Visitor argument: the currently expected proto-kind.
384 */
385 int pkind;
387 /** Visitor argument: the currently expected proto-type.
388 */
389 Type pt;
391 /** Visitor argument: the error key to be generated when a type error occurs
392 */
393 String errKey;
395 /** Visitor result: the computed type.
396 */
397 Type result;
399 /** Visitor method: attribute a tree, catching any completion failure
400 * exceptions. Return the tree's type.
401 *
402 * @param tree The tree to be visited.
403 * @param env The environment visitor argument.
404 * @param pkind The protokind visitor argument.
405 * @param pt The prototype visitor argument.
406 */
407 Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt) {
408 return attribTree(tree, env, pkind, pt, "incompatible.types");
409 }
411 Type attribTree(JCTree tree, Env<AttrContext> env, int pkind, Type pt, String errKey) {
412 Env<AttrContext> prevEnv = this.env;
413 int prevPkind = this.pkind;
414 Type prevPt = this.pt;
415 String prevErrKey = this.errKey;
416 try {
417 this.env = env;
418 this.pkind = pkind;
419 this.pt = pt;
420 this.errKey = errKey;
421 tree.accept(this);
422 if (tree == breakTree)
423 throw new BreakAttr(env);
424 return result;
425 } catch (CompletionFailure ex) {
426 tree.type = syms.errType;
427 return chk.completionError(tree.pos(), ex);
428 } finally {
429 this.env = prevEnv;
430 this.pkind = prevPkind;
431 this.pt = prevPt;
432 this.errKey = prevErrKey;
433 }
434 }
436 /** Derived visitor method: attribute an expression tree.
437 */
438 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt) {
439 return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType);
440 }
442 public Type attribExpr(JCTree tree, Env<AttrContext> env, Type pt, String key) {
443 return attribTree(tree, env, VAL, pt.tag != ERROR ? pt : Type.noType, key);
444 }
446 /** Derived visitor method: attribute an expression tree with
447 * no constraints on the computed type.
448 */
449 Type attribExpr(JCTree tree, Env<AttrContext> env) {
450 return attribTree(tree, env, VAL, Type.noType);
451 }
453 /** Derived visitor method: attribute a type tree.
454 */
455 Type attribType(JCTree tree, Env<AttrContext> env) {
456 Type result = attribType(tree, env, Type.noType);
457 return result;
458 }
460 /** Derived visitor method: attribute a type tree.
461 */
462 Type attribType(JCTree tree, Env<AttrContext> env, Type pt) {
463 Type result = attribTree(tree, env, TYP, pt);
464 return result;
465 }
467 /** Derived visitor method: attribute a statement or definition tree.
468 */
469 public Type attribStat(JCTree tree, Env<AttrContext> env) {
470 return attribTree(tree, env, NIL, Type.noType);
471 }
473 /** Attribute a list of expressions, returning a list of types.
474 */
475 List<Type> attribExprs(List<JCExpression> trees, Env<AttrContext> env, Type pt) {
476 ListBuffer<Type> ts = new ListBuffer<Type>();
477 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
478 ts.append(attribExpr(l.head, env, pt));
479 return ts.toList();
480 }
482 /** Attribute a list of statements, returning nothing.
483 */
484 <T extends JCTree> void attribStats(List<T> trees, Env<AttrContext> env) {
485 for (List<T> l = trees; l.nonEmpty(); l = l.tail)
486 attribStat(l.head, env);
487 }
489 /** Attribute the arguments in a method call, returning a list of types.
490 */
491 List<Type> attribArgs(List<JCExpression> trees, Env<AttrContext> env) {
492 ListBuffer<Type> argtypes = new ListBuffer<Type>();
493 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
494 argtypes.append(chk.checkNonVoid(
495 l.head.pos(), types.upperBound(attribTree(l.head, env, VAL, Infer.anyPoly))));
496 return argtypes.toList();
497 }
499 /** Attribute a type argument list, returning a list of types.
500 * Caller is responsible for calling checkRefTypes.
501 */
502 List<Type> attribAnyTypes(List<JCExpression> trees, Env<AttrContext> env) {
503 ListBuffer<Type> argtypes = new ListBuffer<Type>();
504 for (List<JCExpression> l = trees; l.nonEmpty(); l = l.tail)
505 argtypes.append(attribType(l.head, env));
506 return argtypes.toList();
507 }
509 /** Attribute a type argument list, returning a list of types.
510 * Check that all the types are references.
511 */
512 List<Type> attribTypes(List<JCExpression> trees, Env<AttrContext> env) {
513 List<Type> types = attribAnyTypes(trees, env);
514 return chk.checkRefTypes(trees, types);
515 }
517 /**
518 * Attribute type variables (of generic classes or methods).
519 * Compound types are attributed later in attribBounds.
520 * @param typarams the type variables to enter
521 * @param env the current environment
522 */
523 void attribTypeVariables(List<JCTypeParameter> typarams, Env<AttrContext> env) {
524 for (JCTypeParameter tvar : typarams) {
525 TypeVar a = (TypeVar)tvar.type;
526 a.tsym.flags_field |= UNATTRIBUTED;
527 a.bound = Type.noType;
528 if (!tvar.bounds.isEmpty()) {
529 List<Type> bounds = List.of(attribType(tvar.bounds.head, env));
530 for (JCExpression bound : tvar.bounds.tail)
531 bounds = bounds.prepend(attribType(bound, env));
532 types.setBounds(a, bounds.reverse());
533 } else {
534 // if no bounds are given, assume a single bound of
535 // java.lang.Object.
536 types.setBounds(a, List.of(syms.objectType));
537 }
538 a.tsym.flags_field &= ~UNATTRIBUTED;
539 }
540 for (JCTypeParameter tvar : typarams)
541 chk.checkNonCyclic(tvar.pos(), (TypeVar)tvar.type);
542 attribStats(typarams, env);
543 }
545 void attribBounds(List<JCTypeParameter> typarams) {
546 for (JCTypeParameter typaram : typarams) {
547 Type bound = typaram.type.getUpperBound();
548 if (bound != null && bound.tsym instanceof ClassSymbol) {
549 ClassSymbol c = (ClassSymbol)bound.tsym;
550 if ((c.flags_field & COMPOUND) != 0) {
551 assert (c.flags_field & UNATTRIBUTED) != 0 : c;
552 attribClass(typaram.pos(), c);
553 }
554 }
555 }
556 }
558 /**
559 * Attribute the type references in a list of annotations.
560 */
561 void attribAnnotationTypes(List<JCAnnotation> annotations,
562 Env<AttrContext> env) {
563 for (List<JCAnnotation> al = annotations; al.nonEmpty(); al = al.tail) {
564 JCAnnotation a = al.head;
565 attribType(a.annotationType, env);
566 }
567 }
569 /** Attribute type reference in an `extends' or `implements' clause.
570 * Supertypes of anonymous inner classes are usually already attributed.
571 *
572 * @param tree The tree making up the type reference.
573 * @param env The environment current at the reference.
574 * @param classExpected true if only a class is expected here.
575 * @param interfaceExpected true if only an interface is expected here.
576 */
577 Type attribBase(JCTree tree,
578 Env<AttrContext> env,
579 boolean classExpected,
580 boolean interfaceExpected,
581 boolean checkExtensible) {
582 Type t = tree.type != null ?
583 tree.type :
584 attribType(tree, env);
585 return checkBase(t, tree, env, classExpected, interfaceExpected, checkExtensible);
586 }
587 Type checkBase(Type t,
588 JCTree tree,
589 Env<AttrContext> env,
590 boolean classExpected,
591 boolean interfaceExpected,
592 boolean checkExtensible) {
593 if (t.isErroneous())
594 return t;
595 if (t.tag == TYPEVAR && !classExpected && !interfaceExpected) {
596 // check that type variable is already visible
597 if (t.getUpperBound() == null) {
598 log.error(tree.pos(), "illegal.forward.ref");
599 return types.createErrorType(t);
600 }
601 } else {
602 t = chk.checkClassType(tree.pos(), t, checkExtensible|!allowGenerics);
603 }
604 if (interfaceExpected && (t.tsym.flags() & INTERFACE) == 0) {
605 log.error(tree.pos(), "intf.expected.here");
606 // return errType is necessary since otherwise there might
607 // be undetected cycles which cause attribution to loop
608 return types.createErrorType(t);
609 } else if (checkExtensible &&
610 classExpected &&
611 (t.tsym.flags() & INTERFACE) != 0) {
612 log.error(tree.pos(), "no.intf.expected.here");
613 return types.createErrorType(t);
614 }
615 if (checkExtensible &&
616 ((t.tsym.flags() & FINAL) != 0)) {
617 log.error(tree.pos(),
618 "cant.inherit.from.final", t.tsym);
619 }
620 chk.checkNonCyclic(tree.pos(), t);
621 return t;
622 }
624 public void visitClassDef(JCClassDecl tree) {
625 // Local classes have not been entered yet, so we need to do it now:
626 if ((env.info.scope.owner.kind & (VAR | MTH)) != 0)
627 enter.classEnter(tree, env);
629 ClassSymbol c = tree.sym;
630 if (c == null) {
631 // exit in case something drastic went wrong during enter.
632 result = null;
633 } else {
634 // make sure class has been completed:
635 c.complete();
637 // If this class appears as an anonymous class
638 // in a superclass constructor call where
639 // no explicit outer instance is given,
640 // disable implicit outer instance from being passed.
641 // (This would be an illegal access to "this before super").
642 if (env.info.isSelfCall &&
643 env.tree.getTag() == JCTree.NEWCLASS &&
644 ((JCNewClass) env.tree).encl == null)
645 {
646 c.flags_field |= NOOUTERTHIS;
647 }
648 attribClass(tree.pos(), c);
649 result = tree.type = c.type;
650 }
651 }
653 public void visitMethodDef(JCMethodDecl tree) {
654 MethodSymbol m = tree.sym;
656 Lint lint = env.info.lint.augment(m.attributes_field, m.flags());
657 Lint prevLint = chk.setLint(lint);
658 try {
659 chk.checkDeprecatedAnnotation(tree.pos(), m);
661 attribBounds(tree.typarams);
663 // If we override any other methods, check that we do so properly.
664 // JLS ???
665 chk.checkOverride(tree, m);
667 // Create a new environment with local scope
668 // for attributing the method.
669 Env<AttrContext> localEnv = memberEnter.methodEnv(tree, env);
671 localEnv.info.lint = lint;
673 // Enter all type parameters into the local method scope.
674 for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
675 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
677 ClassSymbol owner = env.enclClass.sym;
678 if ((owner.flags() & ANNOTATION) != 0 &&
679 tree.params.nonEmpty())
680 log.error(tree.params.head.pos(),
681 "intf.annotation.members.cant.have.params");
683 // Attribute all value parameters.
684 for (List<JCVariableDecl> l = tree.params; l.nonEmpty(); l = l.tail) {
685 attribStat(l.head, localEnv);
686 }
688 chk.checkVarargMethodDecl(tree);
690 // Check that type parameters are well-formed.
691 chk.validate(tree.typarams, localEnv);
693 // Check that result type is well-formed.
694 chk.validate(tree.restype, localEnv);
696 // annotation method checks
697 if ((owner.flags() & ANNOTATION) != 0) {
698 // annotation method cannot have throws clause
699 if (tree.thrown.nonEmpty()) {
700 log.error(tree.thrown.head.pos(),
701 "throws.not.allowed.in.intf.annotation");
702 }
703 // annotation method cannot declare type-parameters
704 if (tree.typarams.nonEmpty()) {
705 log.error(tree.typarams.head.pos(),
706 "intf.annotation.members.cant.have.type.params");
707 }
708 // validate annotation method's return type (could be an annotation type)
709 chk.validateAnnotationType(tree.restype);
710 // ensure that annotation method does not clash with members of Object/Annotation
711 chk.validateAnnotationMethod(tree.pos(), m);
713 if (tree.defaultValue != null) {
714 // if default value is an annotation, check it is a well-formed
715 // annotation value (e.g. no duplicate values, no missing values, etc.)
716 chk.validateAnnotationTree(tree.defaultValue);
717 }
718 }
720 for (List<JCExpression> l = tree.thrown; l.nonEmpty(); l = l.tail)
721 chk.checkType(l.head.pos(), l.head.type, syms.throwableType);
723 if (tree.body == null) {
724 // Empty bodies are only allowed for
725 // abstract, native, or interface methods, or for methods
726 // in a retrofit signature class.
727 if ((owner.flags() & INTERFACE) == 0 &&
728 (tree.mods.flags & (ABSTRACT | NATIVE)) == 0 &&
729 !relax)
730 log.error(tree.pos(), "missing.meth.body.or.decl.abstract");
731 if (tree.defaultValue != null) {
732 if ((owner.flags() & ANNOTATION) == 0)
733 log.error(tree.pos(),
734 "default.allowed.in.intf.annotation.member");
735 }
736 } else if ((owner.flags() & INTERFACE) != 0) {
737 log.error(tree.body.pos(), "intf.meth.cant.have.body");
738 } else if ((tree.mods.flags & ABSTRACT) != 0) {
739 log.error(tree.pos(), "abstract.meth.cant.have.body");
740 } else if ((tree.mods.flags & NATIVE) != 0) {
741 log.error(tree.pos(), "native.meth.cant.have.body");
742 } else {
743 // Add an implicit super() call unless an explicit call to
744 // super(...) or this(...) is given
745 // or we are compiling class java.lang.Object.
746 if (tree.name == names.init && owner.type != syms.objectType) {
747 JCBlock body = tree.body;
748 if (body.stats.isEmpty() ||
749 !TreeInfo.isSelfCall(body.stats.head)) {
750 body.stats = body.stats.
751 prepend(memberEnter.SuperCall(make.at(body.pos),
752 List.<Type>nil(),
753 List.<JCVariableDecl>nil(),
754 false));
755 } else if ((env.enclClass.sym.flags() & ENUM) != 0 &&
756 (tree.mods.flags & GENERATEDCONSTR) == 0 &&
757 TreeInfo.isSuperCall(body.stats.head)) {
758 // enum constructors are not allowed to call super
759 // directly, so make sure there aren't any super calls
760 // in enum constructors, except in the compiler
761 // generated one.
762 log.error(tree.body.stats.head.pos(),
763 "call.to.super.not.allowed.in.enum.ctor",
764 env.enclClass.sym);
765 }
766 }
768 // Attribute method body.
769 attribStat(tree.body, localEnv);
770 }
771 localEnv.info.scope.leave();
772 result = tree.type = m.type;
773 chk.validateAnnotations(tree.mods.annotations, m);
774 }
775 finally {
776 chk.setLint(prevLint);
777 }
778 }
780 public void visitVarDef(JCVariableDecl tree) {
781 // Local variables have not been entered yet, so we need to do it now:
782 if (env.info.scope.owner.kind == MTH) {
783 if (tree.sym != null) {
784 // parameters have already been entered
785 env.info.scope.enter(tree.sym);
786 } else {
787 memberEnter.memberEnter(tree, env);
788 annotate.flush();
789 }
790 }
792 VarSymbol v = tree.sym;
793 Lint lint = env.info.lint.augment(v.attributes_field, v.flags());
794 Lint prevLint = chk.setLint(lint);
796 // Check that the variable's declared type is well-formed.
797 chk.validate(tree.vartype, env);
799 try {
800 chk.checkDeprecatedAnnotation(tree.pos(), v);
802 if (tree.init != null) {
803 if ((v.flags_field & FINAL) != 0 && tree.init.getTag() != JCTree.NEWCLASS) {
804 // In this case, `v' is final. Ensure that it's initializer is
805 // evaluated.
806 v.getConstValue(); // ensure initializer is evaluated
807 } else {
808 // Attribute initializer in a new environment
809 // with the declared variable as owner.
810 // Check that initializer conforms to variable's declared type.
811 Env<AttrContext> initEnv = memberEnter.initEnv(tree, env);
812 initEnv.info.lint = lint;
813 // In order to catch self-references, we set the variable's
814 // declaration position to maximal possible value, effectively
815 // marking the variable as undefined.
816 initEnv.info.enclVar = v;
817 attribExpr(tree.init, initEnv, v.type);
818 }
819 }
820 result = tree.type = v.type;
821 chk.validateAnnotations(tree.mods.annotations, v);
822 }
823 finally {
824 chk.setLint(prevLint);
825 }
826 }
828 public void visitSkip(JCSkip tree) {
829 result = null;
830 }
832 public void visitBlock(JCBlock tree) {
833 if (env.info.scope.owner.kind == TYP) {
834 // Block is a static or instance initializer;
835 // let the owner of the environment be a freshly
836 // created BLOCK-method.
837 Env<AttrContext> localEnv =
838 env.dup(tree, env.info.dup(env.info.scope.dupUnshared()));
839 localEnv.info.scope.owner =
840 new MethodSymbol(tree.flags | BLOCK, names.empty, null,
841 env.info.scope.owner);
842 if ((tree.flags & STATIC) != 0) localEnv.info.staticLevel++;
843 attribStats(tree.stats, localEnv);
844 } else {
845 // Create a new local environment with a local scope.
846 Env<AttrContext> localEnv =
847 env.dup(tree, env.info.dup(env.info.scope.dup()));
848 attribStats(tree.stats, localEnv);
849 localEnv.info.scope.leave();
850 }
851 result = null;
852 }
854 public void visitDoLoop(JCDoWhileLoop tree) {
855 attribStat(tree.body, env.dup(tree));
856 attribExpr(tree.cond, env, syms.booleanType);
857 result = null;
858 }
860 public void visitWhileLoop(JCWhileLoop tree) {
861 attribExpr(tree.cond, env, syms.booleanType);
862 attribStat(tree.body, env.dup(tree));
863 result = null;
864 }
866 public void visitForLoop(JCForLoop tree) {
867 Env<AttrContext> loopEnv =
868 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
869 attribStats(tree.init, loopEnv);
870 if (tree.cond != null) attribExpr(tree.cond, loopEnv, syms.booleanType);
871 loopEnv.tree = tree; // before, we were not in loop!
872 attribStats(tree.step, loopEnv);
873 attribStat(tree.body, loopEnv);
874 loopEnv.info.scope.leave();
875 result = null;
876 }
878 public void visitForeachLoop(JCEnhancedForLoop tree) {
879 Env<AttrContext> loopEnv =
880 env.dup(env.tree, env.info.dup(env.info.scope.dup()));
881 attribStat(tree.var, loopEnv);
882 Type exprType = types.upperBound(attribExpr(tree.expr, loopEnv));
883 chk.checkNonVoid(tree.pos(), exprType);
884 Type elemtype = types.elemtype(exprType); // perhaps expr is an array?
885 if (elemtype == null) {
886 // or perhaps expr implements Iterable<T>?
887 Type base = types.asSuper(exprType, syms.iterableType.tsym);
888 if (base == null) {
889 log.error(tree.expr.pos(), "foreach.not.applicable.to.type");
890 elemtype = types.createErrorType(exprType);
891 } else {
892 List<Type> iterableParams = base.allparams();
893 elemtype = iterableParams.isEmpty()
894 ? syms.objectType
895 : types.upperBound(iterableParams.head);
896 }
897 }
898 chk.checkType(tree.expr.pos(), elemtype, tree.var.sym.type);
899 loopEnv.tree = tree; // before, we were not in loop!
900 attribStat(tree.body, loopEnv);
901 loopEnv.info.scope.leave();
902 result = null;
903 }
905 public void visitLabelled(JCLabeledStatement tree) {
906 // Check that label is not used in an enclosing statement
907 Env<AttrContext> env1 = env;
908 while (env1 != null && env1.tree.getTag() != JCTree.CLASSDEF) {
909 if (env1.tree.getTag() == JCTree.LABELLED &&
910 ((JCLabeledStatement) env1.tree).label == tree.label) {
911 log.error(tree.pos(), "label.already.in.use",
912 tree.label);
913 break;
914 }
915 env1 = env1.next;
916 }
918 attribStat(tree.body, env.dup(tree));
919 result = null;
920 }
922 public void visitSwitch(JCSwitch tree) {
923 Type seltype = attribExpr(tree.selector, env);
925 Env<AttrContext> switchEnv =
926 env.dup(tree, env.info.dup(env.info.scope.dup()));
928 boolean enumSwitch =
929 allowEnums &&
930 (seltype.tsym.flags() & Flags.ENUM) != 0;
931 boolean stringSwitch = false;
932 if (types.isSameType(seltype, syms.stringType)) {
933 if (allowStringsInSwitch) {
934 stringSwitch = true;
935 } else {
936 log.error(tree.selector.pos(), "string.switch.not.supported.in.source", sourceName);
937 }
938 }
939 if (!enumSwitch && !stringSwitch)
940 seltype = chk.checkType(tree.selector.pos(), seltype, syms.intType);
942 // Attribute all cases and
943 // check that there are no duplicate case labels or default clauses.
944 Set<Object> labels = new HashSet<Object>(); // The set of case labels.
945 boolean hasDefault = false; // Is there a default label?
946 for (List<JCCase> l = tree.cases; l.nonEmpty(); l = l.tail) {
947 JCCase c = l.head;
948 Env<AttrContext> caseEnv =
949 switchEnv.dup(c, env.info.dup(switchEnv.info.scope.dup()));
950 if (c.pat != null) {
951 if (enumSwitch) {
952 Symbol sym = enumConstant(c.pat, seltype);
953 if (sym == null) {
954 log.error(c.pat.pos(), "enum.const.req");
955 } else if (!labels.add(sym)) {
956 log.error(c.pos(), "duplicate.case.label");
957 }
958 } else {
959 Type pattype = attribExpr(c.pat, switchEnv, seltype);
960 if (pattype.tag != ERROR) {
961 if (pattype.constValue() == null) {
962 log.error(c.pat.pos(),
963 (stringSwitch ? "string.const.req" : "const.expr.req"));
964 } else if (labels.contains(pattype.constValue())) {
965 log.error(c.pos(), "duplicate.case.label");
966 } else {
967 labels.add(pattype.constValue());
968 }
969 }
970 }
971 } else if (hasDefault) {
972 log.error(c.pos(), "duplicate.default.label");
973 } else {
974 hasDefault = true;
975 }
976 attribStats(c.stats, caseEnv);
977 caseEnv.info.scope.leave();
978 addVars(c.stats, switchEnv.info.scope);
979 }
981 switchEnv.info.scope.leave();
982 result = null;
983 }
984 // where
985 /** Add any variables defined in stats to the switch scope. */
986 private static void addVars(List<JCStatement> stats, Scope switchScope) {
987 for (;stats.nonEmpty(); stats = stats.tail) {
988 JCTree stat = stats.head;
989 if (stat.getTag() == JCTree.VARDEF)
990 switchScope.enter(((JCVariableDecl) stat).sym);
991 }
992 }
993 // where
994 /** Return the selected enumeration constant symbol, or null. */
995 private Symbol enumConstant(JCTree tree, Type enumType) {
996 if (tree.getTag() != JCTree.IDENT) {
997 log.error(tree.pos(), "enum.label.must.be.unqualified.enum");
998 return syms.errSymbol;
999 }
1000 JCIdent ident = (JCIdent)tree;
1001 Name name = ident.name;
1002 for (Scope.Entry e = enumType.tsym.members().lookup(name);
1003 e.scope != null; e = e.next()) {
1004 if (e.sym.kind == VAR) {
1005 Symbol s = ident.sym = e.sym;
1006 ((VarSymbol)s).getConstValue(); // ensure initializer is evaluated
1007 ident.type = s.type;
1008 return ((s.flags_field & Flags.ENUM) == 0)
1009 ? null : s;
1010 }
1011 }
1012 return null;
1013 }
1015 public void visitSynchronized(JCSynchronized tree) {
1016 chk.checkRefType(tree.pos(), attribExpr(tree.lock, env));
1017 attribStat(tree.body, env);
1018 result = null;
1019 }
1021 public void visitTry(JCTry tree) {
1022 // Create a new local environment with a local
1023 Env<AttrContext> localEnv = env.dup(tree, env.info.dup(env.info.scope.dup()));
1024 boolean isTryWithResource = tree.resources.nonEmpty();
1025 // Create a nested environment for attributing the try block if needed
1026 Env<AttrContext> tryEnv = isTryWithResource ?
1027 env.dup(tree, localEnv.info.dup(localEnv.info.scope.dup())) :
1028 localEnv;
1029 // Attribute resource declarations
1030 for (JCTree resource : tree.resources) {
1031 if (resource.getTag() == JCTree.VARDEF) {
1032 attribStat(resource, tryEnv);
1033 chk.checkType(resource, resource.type, syms.autoCloseableType, "twr.not.applicable.to.type");
1034 VarSymbol var = (VarSymbol)TreeInfo.symbolFor(resource);
1035 var.setData(ElementKind.RESOURCE_VARIABLE);
1036 } else {
1037 attribExpr(resource, tryEnv, syms.autoCloseableType, "twr.not.applicable.to.type");
1038 }
1039 }
1040 // Attribute body
1041 attribStat(tree.body, tryEnv);
1042 if (isTryWithResource)
1043 tryEnv.info.scope.leave();
1045 // Attribute catch clauses
1046 for (List<JCCatch> l = tree.catchers; l.nonEmpty(); l = l.tail) {
1047 JCCatch c = l.head;
1048 Env<AttrContext> catchEnv =
1049 localEnv.dup(c, localEnv.info.dup(localEnv.info.scope.dup()));
1050 Type ctype = attribStat(c.param, catchEnv);
1051 if (TreeInfo.isMultiCatch(c)) {
1052 //check that multi-catch parameter is marked as final
1053 if ((c.param.sym.flags() & FINAL) == 0) {
1054 log.error(c.param.pos(), "multicatch.param.must.be.final", c.param.sym);
1055 }
1056 c.param.sym.flags_field = c.param.sym.flags() | DISJOINT;
1057 }
1058 if (c.param.type.tsym.kind == Kinds.VAR) {
1059 c.param.sym.setData(ElementKind.EXCEPTION_PARAMETER);
1060 }
1061 chk.checkType(c.param.vartype.pos(),
1062 chk.checkClassType(c.param.vartype.pos(), ctype),
1063 syms.throwableType);
1064 attribStat(c.body, catchEnv);
1065 catchEnv.info.scope.leave();
1066 }
1068 // Attribute finalizer
1069 if (tree.finalizer != null) attribStat(tree.finalizer, localEnv);
1071 localEnv.info.scope.leave();
1072 result = null;
1073 }
1075 public void visitConditional(JCConditional tree) {
1076 attribExpr(tree.cond, env, syms.booleanType);
1077 attribExpr(tree.truepart, env);
1078 attribExpr(tree.falsepart, env);
1079 result = check(tree,
1080 capture(condType(tree.pos(), tree.cond.type,
1081 tree.truepart.type, tree.falsepart.type)),
1082 VAL, pkind, pt);
1083 }
1084 //where
1085 /** Compute the type of a conditional expression, after
1086 * checking that it exists. See Spec 15.25.
1087 *
1088 * @param pos The source position to be used for
1089 * error diagnostics.
1090 * @param condtype The type of the expression's condition.
1091 * @param thentype The type of the expression's then-part.
1092 * @param elsetype The type of the expression's else-part.
1093 */
1094 private Type condType(DiagnosticPosition pos,
1095 Type condtype,
1096 Type thentype,
1097 Type elsetype) {
1098 Type ctype = condType1(pos, condtype, thentype, elsetype);
1100 // If condition and both arms are numeric constants,
1101 // evaluate at compile-time.
1102 return ((condtype.constValue() != null) &&
1103 (thentype.constValue() != null) &&
1104 (elsetype.constValue() != null))
1105 ? cfolder.coerce(condtype.isTrue()?thentype:elsetype, ctype)
1106 : ctype;
1107 }
1108 /** Compute the type of a conditional expression, after
1109 * checking that it exists. Does not take into
1110 * account the special case where condition and both arms
1111 * are constants.
1112 *
1113 * @param pos The source position to be used for error
1114 * diagnostics.
1115 * @param condtype The type of the expression's condition.
1116 * @param thentype The type of the expression's then-part.
1117 * @param elsetype The type of the expression's else-part.
1118 */
1119 private Type condType1(DiagnosticPosition pos, Type condtype,
1120 Type thentype, Type elsetype) {
1121 // If same type, that is the result
1122 if (types.isSameType(thentype, elsetype))
1123 return thentype.baseType();
1125 Type thenUnboxed = (!allowBoxing || thentype.isPrimitive())
1126 ? thentype : types.unboxedType(thentype);
1127 Type elseUnboxed = (!allowBoxing || elsetype.isPrimitive())
1128 ? elsetype : types.unboxedType(elsetype);
1130 // Otherwise, if both arms can be converted to a numeric
1131 // type, return the least numeric type that fits both arms
1132 // (i.e. return larger of the two, or return int if one
1133 // arm is short, the other is char).
1134 if (thenUnboxed.isPrimitive() && elseUnboxed.isPrimitive()) {
1135 // If one arm has an integer subrange type (i.e., byte,
1136 // short, or char), and the other is an integer constant
1137 // that fits into the subrange, return the subrange type.
1138 if (thenUnboxed.tag < INT && elseUnboxed.tag == INT &&
1139 types.isAssignable(elseUnboxed, thenUnboxed))
1140 return thenUnboxed.baseType();
1141 if (elseUnboxed.tag < INT && thenUnboxed.tag == INT &&
1142 types.isAssignable(thenUnboxed, elseUnboxed))
1143 return elseUnboxed.baseType();
1145 for (int i = BYTE; i < VOID; i++) {
1146 Type candidate = syms.typeOfTag[i];
1147 if (types.isSubtype(thenUnboxed, candidate) &&
1148 types.isSubtype(elseUnboxed, candidate))
1149 return candidate;
1150 }
1151 }
1153 // Those were all the cases that could result in a primitive
1154 if (allowBoxing) {
1155 if (thentype.isPrimitive())
1156 thentype = types.boxedClass(thentype).type;
1157 if (elsetype.isPrimitive())
1158 elsetype = types.boxedClass(elsetype).type;
1159 }
1161 if (types.isSubtype(thentype, elsetype))
1162 return elsetype.baseType();
1163 if (types.isSubtype(elsetype, thentype))
1164 return thentype.baseType();
1166 if (!allowBoxing || thentype.tag == VOID || elsetype.tag == VOID) {
1167 log.error(pos, "neither.conditional.subtype",
1168 thentype, elsetype);
1169 return thentype.baseType();
1170 }
1172 // both are known to be reference types. The result is
1173 // lub(thentype,elsetype). This cannot fail, as it will
1174 // always be possible to infer "Object" if nothing better.
1175 return types.lub(thentype.baseType(), elsetype.baseType());
1176 }
1178 public void visitIf(JCIf tree) {
1179 attribExpr(tree.cond, env, syms.booleanType);
1180 attribStat(tree.thenpart, env);
1181 if (tree.elsepart != null)
1182 attribStat(tree.elsepart, env);
1183 chk.checkEmptyIf(tree);
1184 result = null;
1185 }
1187 public void visitExec(JCExpressionStatement tree) {
1188 //a fresh environment is required for 292 inference to work properly ---
1189 //see Infer.instantiatePolymorphicSignatureInstance()
1190 Env<AttrContext> localEnv = env.dup(tree);
1191 attribExpr(tree.expr, localEnv);
1192 result = null;
1193 }
1195 public void visitBreak(JCBreak tree) {
1196 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1197 result = null;
1198 }
1200 public void visitContinue(JCContinue tree) {
1201 tree.target = findJumpTarget(tree.pos(), tree.getTag(), tree.label, env);
1202 result = null;
1203 }
1204 //where
1205 /** Return the target of a break or continue statement, if it exists,
1206 * report an error if not.
1207 * Note: The target of a labelled break or continue is the
1208 * (non-labelled) statement tree referred to by the label,
1209 * not the tree representing the labelled statement itself.
1210 *
1211 * @param pos The position to be used for error diagnostics
1212 * @param tag The tag of the jump statement. This is either
1213 * Tree.BREAK or Tree.CONTINUE.
1214 * @param label The label of the jump statement, or null if no
1215 * label is given.
1216 * @param env The environment current at the jump statement.
1217 */
1218 private JCTree findJumpTarget(DiagnosticPosition pos,
1219 int tag,
1220 Name label,
1221 Env<AttrContext> env) {
1222 // Search environments outwards from the point of jump.
1223 Env<AttrContext> env1 = env;
1224 LOOP:
1225 while (env1 != null) {
1226 switch (env1.tree.getTag()) {
1227 case JCTree.LABELLED:
1228 JCLabeledStatement labelled = (JCLabeledStatement)env1.tree;
1229 if (label == labelled.label) {
1230 // If jump is a continue, check that target is a loop.
1231 if (tag == JCTree.CONTINUE) {
1232 if (labelled.body.getTag() != JCTree.DOLOOP &&
1233 labelled.body.getTag() != JCTree.WHILELOOP &&
1234 labelled.body.getTag() != JCTree.FORLOOP &&
1235 labelled.body.getTag() != JCTree.FOREACHLOOP)
1236 log.error(pos, "not.loop.label", label);
1237 // Found labelled statement target, now go inwards
1238 // to next non-labelled tree.
1239 return TreeInfo.referencedStatement(labelled);
1240 } else {
1241 return labelled;
1242 }
1243 }
1244 break;
1245 case JCTree.DOLOOP:
1246 case JCTree.WHILELOOP:
1247 case JCTree.FORLOOP:
1248 case JCTree.FOREACHLOOP:
1249 if (label == null) return env1.tree;
1250 break;
1251 case JCTree.SWITCH:
1252 if (label == null && tag == JCTree.BREAK) return env1.tree;
1253 break;
1254 case JCTree.METHODDEF:
1255 case JCTree.CLASSDEF:
1256 break LOOP;
1257 default:
1258 }
1259 env1 = env1.next;
1260 }
1261 if (label != null)
1262 log.error(pos, "undef.label", label);
1263 else if (tag == JCTree.CONTINUE)
1264 log.error(pos, "cont.outside.loop");
1265 else
1266 log.error(pos, "break.outside.switch.loop");
1267 return null;
1268 }
1270 public void visitReturn(JCReturn tree) {
1271 // Check that there is an enclosing method which is
1272 // nested within than the enclosing class.
1273 if (env.enclMethod == null ||
1274 env.enclMethod.sym.owner != env.enclClass.sym) {
1275 log.error(tree.pos(), "ret.outside.meth");
1277 } else {
1278 // Attribute return expression, if it exists, and check that
1279 // it conforms to result type of enclosing method.
1280 Symbol m = env.enclMethod.sym;
1281 if (m.type.getReturnType().tag == VOID) {
1282 if (tree.expr != null)
1283 log.error(tree.expr.pos(),
1284 "cant.ret.val.from.meth.decl.void");
1285 } else if (tree.expr == null) {
1286 log.error(tree.pos(), "missing.ret.val");
1287 } else {
1288 attribExpr(tree.expr, env, m.type.getReturnType());
1289 }
1290 }
1291 result = null;
1292 }
1294 public void visitThrow(JCThrow tree) {
1295 attribExpr(tree.expr, env, syms.throwableType);
1296 result = null;
1297 }
1299 public void visitAssert(JCAssert tree) {
1300 attribExpr(tree.cond, env, syms.booleanType);
1301 if (tree.detail != null) {
1302 chk.checkNonVoid(tree.detail.pos(), attribExpr(tree.detail, env));
1303 }
1304 result = null;
1305 }
1307 /** Visitor method for method invocations.
1308 * NOTE: The method part of an application will have in its type field
1309 * the return type of the method, not the method's type itself!
1310 */
1311 public void visitApply(JCMethodInvocation tree) {
1312 // The local environment of a method application is
1313 // a new environment nested in the current one.
1314 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1316 // The types of the actual method arguments.
1317 List<Type> argtypes;
1319 // The types of the actual method type arguments.
1320 List<Type> typeargtypes = null;
1321 boolean typeargtypesNonRefOK = false;
1323 Name methName = TreeInfo.name(tree.meth);
1325 boolean isConstructorCall =
1326 methName == names._this || methName == names._super;
1328 if (isConstructorCall) {
1329 // We are seeing a ...this(...) or ...super(...) call.
1330 // Check that this is the first statement in a constructor.
1331 if (checkFirstConstructorStat(tree, env)) {
1333 // Record the fact
1334 // that this is a constructor call (using isSelfCall).
1335 localEnv.info.isSelfCall = true;
1337 // Attribute arguments, yielding list of argument types.
1338 argtypes = attribArgs(tree.args, localEnv);
1339 typeargtypes = attribTypes(tree.typeargs, localEnv);
1341 // Variable `site' points to the class in which the called
1342 // constructor is defined.
1343 Type site = env.enclClass.sym.type;
1344 if (methName == names._super) {
1345 if (site == syms.objectType) {
1346 log.error(tree.meth.pos(), "no.superclass", site);
1347 site = types.createErrorType(syms.objectType);
1348 } else {
1349 site = types.supertype(site);
1350 }
1351 }
1353 if (site.tag == CLASS) {
1354 Type encl = site.getEnclosingType();
1355 while (encl != null && encl.tag == TYPEVAR)
1356 encl = encl.getUpperBound();
1357 if (encl.tag == CLASS) {
1358 // we are calling a nested class
1360 if (tree.meth.getTag() == JCTree.SELECT) {
1361 JCTree qualifier = ((JCFieldAccess) tree.meth).selected;
1363 // We are seeing a prefixed call, of the form
1364 // <expr>.super(...).
1365 // Check that the prefix expression conforms
1366 // to the outer instance type of the class.
1367 chk.checkRefType(qualifier.pos(),
1368 attribExpr(qualifier, localEnv,
1369 encl));
1370 } else if (methName == names._super) {
1371 // qualifier omitted; check for existence
1372 // of an appropriate implicit qualifier.
1373 rs.resolveImplicitThis(tree.meth.pos(),
1374 localEnv, site);
1375 }
1376 } else if (tree.meth.getTag() == JCTree.SELECT) {
1377 log.error(tree.meth.pos(), "illegal.qual.not.icls",
1378 site.tsym);
1379 }
1381 // if we're calling a java.lang.Enum constructor,
1382 // prefix the implicit String and int parameters
1383 if (site.tsym == syms.enumSym && allowEnums)
1384 argtypes = argtypes.prepend(syms.intType).prepend(syms.stringType);
1386 // Resolve the called constructor under the assumption
1387 // that we are referring to a superclass instance of the
1388 // current instance (JLS ???).
1389 boolean selectSuperPrev = localEnv.info.selectSuper;
1390 localEnv.info.selectSuper = true;
1391 localEnv.info.varArgs = false;
1392 Symbol sym = rs.resolveConstructor(
1393 tree.meth.pos(), localEnv, site, argtypes, typeargtypes);
1394 localEnv.info.selectSuper = selectSuperPrev;
1396 // Set method symbol to resolved constructor...
1397 TreeInfo.setSymbol(tree.meth, sym);
1399 // ...and check that it is legal in the current context.
1400 // (this will also set the tree's type)
1401 Type mpt = newMethTemplate(argtypes, typeargtypes);
1402 checkId(tree.meth, site, sym, localEnv, MTH,
1403 mpt, tree.varargsElement != null);
1404 }
1405 // Otherwise, `site' is an error type and we do nothing
1406 }
1407 result = tree.type = syms.voidType;
1408 } else {
1409 // Otherwise, we are seeing a regular method call.
1410 // Attribute the arguments, yielding list of argument types, ...
1411 argtypes = attribArgs(tree.args, localEnv);
1412 typeargtypes = attribAnyTypes(tree.typeargs, localEnv);
1414 // ... and attribute the method using as a prototype a methodtype
1415 // whose formal argument types is exactly the list of actual
1416 // arguments (this will also set the method symbol).
1417 Type mpt = newMethTemplate(argtypes, typeargtypes);
1418 localEnv.info.varArgs = false;
1419 Type mtype = attribExpr(tree.meth, localEnv, mpt);
1420 if (localEnv.info.varArgs)
1421 assert mtype.isErroneous() || tree.varargsElement != null;
1423 // Compute the result type.
1424 Type restype = mtype.getReturnType();
1425 assert restype.tag != WILDCARD : mtype;
1427 // as a special case, array.clone() has a result that is
1428 // the same as static type of the array being cloned
1429 if (tree.meth.getTag() == JCTree.SELECT &&
1430 allowCovariantReturns &&
1431 methName == names.clone &&
1432 types.isArray(((JCFieldAccess) tree.meth).selected.type))
1433 restype = ((JCFieldAccess) tree.meth).selected.type;
1435 // as a special case, x.getClass() has type Class<? extends |X|>
1436 if (allowGenerics &&
1437 methName == names.getClass && tree.args.isEmpty()) {
1438 Type qualifier = (tree.meth.getTag() == JCTree.SELECT)
1439 ? ((JCFieldAccess) tree.meth).selected.type
1440 : env.enclClass.sym.type;
1441 restype = new
1442 ClassType(restype.getEnclosingType(),
1443 List.<Type>of(new WildcardType(types.erasure(qualifier),
1444 BoundKind.EXTENDS,
1445 syms.boundClass)),
1446 restype.tsym);
1447 }
1449 // Special case logic for JSR 292 types.
1450 if (rs.allowTransitionalJSR292 &&
1451 tree.meth.getTag() == JCTree.SELECT &&
1452 !typeargtypes.isEmpty()) {
1453 JCFieldAccess mfield = (JCFieldAccess) tree.meth;
1454 // MethodHandle.<T>invoke(abc) and InvokeDynamic.<T>foo(abc)
1455 // has type <T>, and T can be a primitive type.
1456 if (mfield.sym != null &&
1457 mfield.sym.isPolymorphicSignatureInstance())
1458 typeargtypesNonRefOK = true;
1459 }
1461 if (!(rs.allowTransitionalJSR292 && typeargtypesNonRefOK)) {
1462 chk.checkRefTypes(tree.typeargs, typeargtypes);
1463 }
1465 // Check that value of resulting type is admissible in the
1466 // current context. Also, capture the return type
1467 result = check(tree, capture(restype), VAL, pkind, pt);
1468 }
1469 chk.validate(tree.typeargs, localEnv);
1470 }
1471 //where
1472 /** Check that given application node appears as first statement
1473 * in a constructor call.
1474 * @param tree The application node
1475 * @param env The environment current at the application.
1476 */
1477 boolean checkFirstConstructorStat(JCMethodInvocation tree, Env<AttrContext> env) {
1478 JCMethodDecl enclMethod = env.enclMethod;
1479 if (enclMethod != null && enclMethod.name == names.init) {
1480 JCBlock body = enclMethod.body;
1481 if (body.stats.head.getTag() == JCTree.EXEC &&
1482 ((JCExpressionStatement) body.stats.head).expr == tree)
1483 return true;
1484 }
1485 log.error(tree.pos(),"call.must.be.first.stmt.in.ctor",
1486 TreeInfo.name(tree.meth));
1487 return false;
1488 }
1490 /** Obtain a method type with given argument types.
1491 */
1492 Type newMethTemplate(List<Type> argtypes, List<Type> typeargtypes) {
1493 MethodType mt = new MethodType(argtypes, null, null, syms.methodClass);
1494 return (typeargtypes == null) ? mt : (Type)new ForAll(typeargtypes, mt);
1495 }
1497 public void visitNewClass(JCNewClass tree) {
1498 Type owntype = types.createErrorType(tree.type);
1500 // The local environment of a class creation is
1501 // a new environment nested in the current one.
1502 Env<AttrContext> localEnv = env.dup(tree, env.info.dup());
1504 // The anonymous inner class definition of the new expression,
1505 // if one is defined by it.
1506 JCClassDecl cdef = tree.def;
1508 // If enclosing class is given, attribute it, and
1509 // complete class name to be fully qualified
1510 JCExpression clazz = tree.clazz; // Class field following new
1511 JCExpression clazzid = // Identifier in class field
1512 (clazz.getTag() == JCTree.TYPEAPPLY)
1513 ? ((JCTypeApply) clazz).clazz
1514 : clazz;
1516 JCExpression clazzid1 = clazzid; // The same in fully qualified form
1518 if (tree.encl != null) {
1519 // We are seeing a qualified new, of the form
1520 // <expr>.new C <...> (...) ...
1521 // In this case, we let clazz stand for the name of the
1522 // allocated class C prefixed with the type of the qualifier
1523 // expression, so that we can
1524 // resolve it with standard techniques later. I.e., if
1525 // <expr> has type T, then <expr>.new C <...> (...)
1526 // yields a clazz T.C.
1527 Type encltype = chk.checkRefType(tree.encl.pos(),
1528 attribExpr(tree.encl, env));
1529 clazzid1 = make.at(clazz.pos).Select(make.Type(encltype),
1530 ((JCIdent) clazzid).name);
1531 if (clazz.getTag() == JCTree.TYPEAPPLY)
1532 clazz = make.at(tree.pos).
1533 TypeApply(clazzid1,
1534 ((JCTypeApply) clazz).arguments);
1535 else
1536 clazz = clazzid1;
1537 }
1539 // Attribute clazz expression and store
1540 // symbol + type back into the attributed tree.
1541 Type clazztype = attribType(clazz, env);
1542 Pair<Scope,Scope> mapping = getSyntheticScopeMapping(clazztype);
1543 if (!TreeInfo.isDiamond(tree)) {
1544 clazztype = chk.checkClassType(
1545 tree.clazz.pos(), clazztype, true);
1546 }
1547 chk.validate(clazz, localEnv);
1548 if (tree.encl != null) {
1549 // We have to work in this case to store
1550 // symbol + type back into the attributed tree.
1551 tree.clazz.type = clazztype;
1552 TreeInfo.setSymbol(clazzid, TreeInfo.symbol(clazzid1));
1553 clazzid.type = ((JCIdent) clazzid).sym.type;
1554 if (!clazztype.isErroneous()) {
1555 if (cdef != null && clazztype.tsym.isInterface()) {
1556 log.error(tree.encl.pos(), "anon.class.impl.intf.no.qual.for.new");
1557 } else if (clazztype.tsym.isStatic()) {
1558 log.error(tree.encl.pos(), "qualified.new.of.static.class", clazztype.tsym);
1559 }
1560 }
1561 } else if (!clazztype.tsym.isInterface() &&
1562 clazztype.getEnclosingType().tag == CLASS) {
1563 // Check for the existence of an apropos outer instance
1564 rs.resolveImplicitThis(tree.pos(), env, clazztype);
1565 }
1567 // Attribute constructor arguments.
1568 List<Type> argtypes = attribArgs(tree.args, localEnv);
1569 List<Type> typeargtypes = attribTypes(tree.typeargs, localEnv);
1571 if (TreeInfo.isDiamond(tree)) {
1572 clazztype = attribDiamond(localEnv, tree, clazztype, mapping, argtypes, typeargtypes);
1573 clazz.type = clazztype;
1574 }
1576 // If we have made no mistakes in the class type...
1577 if (clazztype.tag == CLASS) {
1578 // Enums may not be instantiated except implicitly
1579 if (allowEnums &&
1580 (clazztype.tsym.flags_field&Flags.ENUM) != 0 &&
1581 (env.tree.getTag() != JCTree.VARDEF ||
1582 (((JCVariableDecl) env.tree).mods.flags&Flags.ENUM) == 0 ||
1583 ((JCVariableDecl) env.tree).init != tree))
1584 log.error(tree.pos(), "enum.cant.be.instantiated");
1585 // Check that class is not abstract
1586 if (cdef == null &&
1587 (clazztype.tsym.flags() & (ABSTRACT | INTERFACE)) != 0) {
1588 log.error(tree.pos(), "abstract.cant.be.instantiated",
1589 clazztype.tsym);
1590 } else if (cdef != null && clazztype.tsym.isInterface()) {
1591 // Check that no constructor arguments are given to
1592 // anonymous classes implementing an interface
1593 if (!argtypes.isEmpty())
1594 log.error(tree.args.head.pos(), "anon.class.impl.intf.no.args");
1596 if (!typeargtypes.isEmpty())
1597 log.error(tree.typeargs.head.pos(), "anon.class.impl.intf.no.typeargs");
1599 // Error recovery: pretend no arguments were supplied.
1600 argtypes = List.nil();
1601 typeargtypes = List.nil();
1602 }
1604 // Resolve the called constructor under the assumption
1605 // that we are referring to a superclass instance of the
1606 // current instance (JLS ???).
1607 else {
1608 localEnv.info.selectSuper = cdef != null;
1609 localEnv.info.varArgs = false;
1610 tree.constructor = rs.resolveConstructor(
1611 tree.pos(), localEnv, clazztype, argtypes, typeargtypes);
1612 tree.constructorType = tree.constructor.type.isErroneous() ?
1613 syms.errType :
1614 checkMethod(clazztype,
1615 tree.constructor,
1616 localEnv,
1617 tree.args,
1618 argtypes,
1619 typeargtypes,
1620 localEnv.info.varArgs);
1621 if (localEnv.info.varArgs)
1622 assert tree.constructorType.isErroneous() || tree.varargsElement != null;
1623 }
1625 if (cdef != null) {
1626 // We are seeing an anonymous class instance creation.
1627 // In this case, the class instance creation
1628 // expression
1629 //
1630 // E.new <typeargs1>C<typargs2>(args) { ... }
1631 //
1632 // is represented internally as
1633 //
1634 // E . new <typeargs1>C<typargs2>(args) ( class <empty-name> { ... } ) .
1635 //
1636 // This expression is then *transformed* as follows:
1637 //
1638 // (1) add a STATIC flag to the class definition
1639 // if the current environment is static
1640 // (2) add an extends or implements clause
1641 // (3) add a constructor.
1642 //
1643 // For instance, if C is a class, and ET is the type of E,
1644 // the expression
1645 //
1646 // E.new <typeargs1>C<typargs2>(args) { ... }
1647 //
1648 // is translated to (where X is a fresh name and typarams is the
1649 // parameter list of the super constructor):
1650 //
1651 // new <typeargs1>X(<*nullchk*>E, args) where
1652 // X extends C<typargs2> {
1653 // <typarams> X(ET e, args) {
1654 // e.<typeargs1>super(args)
1655 // }
1656 // ...
1657 // }
1658 if (Resolve.isStatic(env)) cdef.mods.flags |= STATIC;
1660 if (clazztype.tsym.isInterface()) {
1661 cdef.implementing = List.of(clazz);
1662 } else {
1663 cdef.extending = clazz;
1664 }
1666 attribStat(cdef, localEnv);
1668 // If an outer instance is given,
1669 // prefix it to the constructor arguments
1670 // and delete it from the new expression
1671 if (tree.encl != null && !clazztype.tsym.isInterface()) {
1672 tree.args = tree.args.prepend(makeNullCheck(tree.encl));
1673 argtypes = argtypes.prepend(tree.encl.type);
1674 tree.encl = null;
1675 }
1677 // Reassign clazztype and recompute constructor.
1678 clazztype = cdef.sym.type;
1679 Symbol sym = rs.resolveConstructor(
1680 tree.pos(), localEnv, clazztype, argtypes,
1681 typeargtypes, true, tree.varargsElement != null);
1682 assert sym.kind < AMBIGUOUS || tree.constructor.type.isErroneous();
1683 tree.constructor = sym;
1684 if (tree.constructor.kind > ERRONEOUS) {
1685 tree.constructorType = syms.errType;
1686 }
1687 else {
1688 tree.constructorType = checkMethod(clazztype,
1689 tree.constructor,
1690 localEnv,
1691 tree.args,
1692 argtypes,
1693 typeargtypes,
1694 localEnv.info.varArgs);
1695 }
1696 }
1698 if (tree.constructor != null && tree.constructor.kind == MTH)
1699 owntype = clazztype;
1700 }
1701 result = check(tree, owntype, VAL, pkind, pt);
1702 chk.validate(tree.typeargs, localEnv);
1703 }
1705 Type attribDiamond(Env<AttrContext> env,
1706 JCNewClass tree,
1707 Type clazztype,
1708 Pair<Scope, Scope> mapping,
1709 List<Type> argtypes,
1710 List<Type> typeargtypes) {
1711 if (clazztype.isErroneous() || mapping == erroneousMapping) {
1712 //if the type of the instance creation expression is erroneous,
1713 //or something prevented us to form a valid mapping, return the
1714 //(possibly erroneous) type unchanged
1715 return clazztype;
1716 }
1717 else if (clazztype.isInterface()) {
1718 //if the type of the instance creation expression is an interface
1719 //skip the method resolution step (JLS 15.12.2.7). The type to be
1720 //inferred is of the kind <X1,X2, ... Xn>C<X1,X2, ... Xn>
1721 clazztype = new ForAll(clazztype.tsym.type.allparams(), clazztype.tsym.type) {
1722 @Override
1723 public List<Type> getConstraints(TypeVar tv, ConstraintKind ck) {
1724 switch (ck) {
1725 case EXTENDS: return types.getBounds(tv);
1726 default: return List.nil();
1727 }
1728 }
1729 @Override
1730 public Type inst(List<Type> inferred, Types types) throws Infer.NoInstanceException {
1731 // check that inferred bounds conform to their bounds
1732 infer.checkWithinBounds(tvars,
1733 types.subst(tvars, tvars, inferred), Warner.noWarnings);
1734 return super.inst(inferred, types);
1735 }
1736 };
1737 } else {
1738 //if the type of the instance creation expression is a class type
1739 //apply method resolution inference (JLS 15.12.2.7). The return type
1740 //of the resolved constructor will be a partially instantiated type
1741 ((ClassSymbol) clazztype.tsym).members_field = mapping.snd;
1742 Symbol constructor;
1743 try {
1744 constructor = rs.resolveDiamond(tree.pos(),
1745 env,
1746 clazztype.tsym.type,
1747 argtypes,
1748 typeargtypes);
1749 } finally {
1750 ((ClassSymbol) clazztype.tsym).members_field = mapping.fst;
1751 }
1752 if (constructor.kind == MTH) {
1753 ClassType ct = new ClassType(clazztype.getEnclosingType(),
1754 clazztype.tsym.type.getTypeArguments(),
1755 clazztype.tsym);
1756 clazztype = checkMethod(ct,
1757 constructor,
1758 env,
1759 tree.args,
1760 argtypes,
1761 typeargtypes,
1762 env.info.varArgs).getReturnType();
1763 } else {
1764 clazztype = syms.errType;
1765 }
1766 }
1767 if (clazztype.tag == FORALL && !pt.isErroneous()) {
1768 //if the resolved constructor's return type has some uninferred
1769 //type-variables, infer them using the expected type and declared
1770 //bounds (JLS 15.12.2.8).
1771 try {
1772 clazztype = infer.instantiateExpr((ForAll) clazztype,
1773 pt.tag == NONE ? syms.objectType : pt,
1774 Warner.noWarnings);
1775 } catch (Infer.InferenceException ex) {
1776 //an error occurred while inferring uninstantiated type-variables
1777 log.error(tree.clazz.pos(),
1778 "cant.apply.diamond.1",
1779 diags.fragment("diamond", clazztype.tsym),
1780 ex.diagnostic);
1781 }
1782 }
1783 clazztype = chk.checkClassType(tree.clazz.pos(),
1784 clazztype,
1785 true);
1786 if (clazztype.tag == CLASS) {
1787 List<Type> invalidDiamondArgs = chk.checkDiamond((ClassType)clazztype);
1788 if (!clazztype.isErroneous() && invalidDiamondArgs.nonEmpty()) {
1789 //one or more types inferred in the previous steps is either a
1790 //captured type or an intersection type --- we need to report an error.
1791 String subkey = invalidDiamondArgs.size() > 1 ?
1792 "diamond.invalid.args" :
1793 "diamond.invalid.arg";
1794 //The error message is of the kind:
1795 //
1796 //cannot infer type arguments for {clazztype}<>;
1797 //reason: {subkey}
1798 //
1799 //where subkey is a fragment of the kind:
1800 //
1801 //type argument(s) {invalidDiamondArgs} inferred for {clazztype}<> is not allowed in this context
1802 log.error(tree.clazz.pos(),
1803 "cant.apply.diamond.1",
1804 diags.fragment("diamond", clazztype.tsym),
1805 diags.fragment(subkey,
1806 invalidDiamondArgs,
1807 diags.fragment("diamond", clazztype.tsym)));
1808 }
1809 }
1810 return clazztype;
1811 }
1813 /** Creates a synthetic scope containing fake generic constructors.
1814 * Assuming that the original scope contains a constructor of the kind:
1815 * Foo(X x, Y y), where X,Y are class type-variables declared in Foo,
1816 * the synthetic scope is added a generic constructor of the kind:
1817 * <X,Y>Foo<X,Y>(X x, Y y). This is crucial in order to enable diamond
1818 * inference. The inferred return type of the synthetic constructor IS
1819 * the inferred type for the diamond operator.
1820 */
1821 private Pair<Scope, Scope> getSyntheticScopeMapping(Type ctype) {
1822 if (ctype.tag != CLASS) {
1823 return erroneousMapping;
1824 }
1825 Pair<Scope, Scope> mapping =
1826 new Pair<Scope, Scope>(ctype.tsym.members(), new Scope(ctype.tsym));
1827 List<Type> typevars = ctype.tsym.type.getTypeArguments();
1828 for (Scope.Entry e = mapping.fst.lookup(names.init);
1829 e.scope != null;
1830 e = e.next()) {
1831 MethodSymbol newConstr = (MethodSymbol) e.sym.clone(ctype.tsym);
1832 newConstr.name = names.init;
1833 List<Type> oldTypeargs = List.nil();
1834 if (newConstr.type.tag == FORALL) {
1835 oldTypeargs = ((ForAll) newConstr.type).tvars;
1836 }
1837 newConstr.type = new MethodType(newConstr.type.getParameterTypes(),
1838 new ClassType(ctype.getEnclosingType(), ctype.tsym.type.getTypeArguments(), ctype.tsym),
1839 newConstr.type.getThrownTypes(),
1840 syms.methodClass);
1841 newConstr.type = new ForAll(typevars.prependList(oldTypeargs), newConstr.type);
1842 mapping.snd.enter(newConstr);
1843 }
1844 return mapping;
1845 }
1847 private final Pair<Scope,Scope> erroneousMapping = new Pair<Scope,Scope>(null, null);
1849 /** Make an attributed null check tree.
1850 */
1851 public JCExpression makeNullCheck(JCExpression arg) {
1852 // optimization: X.this is never null; skip null check
1853 Name name = TreeInfo.name(arg);
1854 if (name == names._this || name == names._super) return arg;
1856 int optag = JCTree.NULLCHK;
1857 JCUnary tree = make.at(arg.pos).Unary(optag, arg);
1858 tree.operator = syms.nullcheck;
1859 tree.type = arg.type;
1860 return tree;
1861 }
1863 public void visitNewArray(JCNewArray tree) {
1864 Type owntype = types.createErrorType(tree.type);
1865 Type elemtype;
1866 if (tree.elemtype != null) {
1867 elemtype = attribType(tree.elemtype, env);
1868 chk.validate(tree.elemtype, env);
1869 owntype = elemtype;
1870 for (List<JCExpression> l = tree.dims; l.nonEmpty(); l = l.tail) {
1871 attribExpr(l.head, env, syms.intType);
1872 owntype = new ArrayType(owntype, syms.arrayClass);
1873 }
1874 } else {
1875 // we are seeing an untyped aggregate { ... }
1876 // this is allowed only if the prototype is an array
1877 if (pt.tag == ARRAY) {
1878 elemtype = types.elemtype(pt);
1879 } else {
1880 if (pt.tag != ERROR) {
1881 log.error(tree.pos(), "illegal.initializer.for.type",
1882 pt);
1883 }
1884 elemtype = types.createErrorType(pt);
1885 }
1886 }
1887 if (tree.elems != null) {
1888 attribExprs(tree.elems, env, elemtype);
1889 owntype = new ArrayType(elemtype, syms.arrayClass);
1890 }
1891 if (!types.isReifiable(elemtype))
1892 log.error(tree.pos(), "generic.array.creation");
1893 result = check(tree, owntype, VAL, pkind, pt);
1894 }
1896 public void visitParens(JCParens tree) {
1897 Type owntype = attribTree(tree.expr, env, pkind, pt);
1898 result = check(tree, owntype, pkind, pkind, pt);
1899 Symbol sym = TreeInfo.symbol(tree);
1900 if (sym != null && (sym.kind&(TYP|PCK)) != 0)
1901 log.error(tree.pos(), "illegal.start.of.type");
1902 }
1904 public void visitAssign(JCAssign tree) {
1905 Type owntype = attribTree(tree.lhs, env.dup(tree), VAR, Type.noType);
1906 Type capturedType = capture(owntype);
1907 attribExpr(tree.rhs, env, owntype);
1908 result = check(tree, capturedType, VAL, pkind, pt);
1909 }
1911 public void visitAssignop(JCAssignOp tree) {
1912 // Attribute arguments.
1913 Type owntype = attribTree(tree.lhs, env, VAR, Type.noType);
1914 Type operand = attribExpr(tree.rhs, env);
1915 // Find operator.
1916 Symbol operator = tree.operator = rs.resolveBinaryOperator(
1917 tree.pos(), tree.getTag() - JCTree.ASGOffset, env,
1918 owntype, operand);
1920 if (operator.kind == MTH) {
1921 chk.checkOperator(tree.pos(),
1922 (OperatorSymbol)operator,
1923 tree.getTag() - JCTree.ASGOffset,
1924 owntype,
1925 operand);
1926 chk.checkDivZero(tree.rhs.pos(), operator, operand);
1927 chk.checkCastable(tree.rhs.pos(),
1928 operator.type.getReturnType(),
1929 owntype);
1930 }
1931 result = check(tree, owntype, VAL, pkind, pt);
1932 }
1934 public void visitUnary(JCUnary tree) {
1935 // Attribute arguments.
1936 Type argtype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1937 ? attribTree(tree.arg, env, VAR, Type.noType)
1938 : chk.checkNonVoid(tree.arg.pos(), attribExpr(tree.arg, env));
1940 // Find operator.
1941 Symbol operator = tree.operator =
1942 rs.resolveUnaryOperator(tree.pos(), tree.getTag(), env, argtype);
1944 Type owntype = types.createErrorType(tree.type);
1945 if (operator.kind == MTH) {
1946 owntype = (JCTree.PREINC <= tree.getTag() && tree.getTag() <= JCTree.POSTDEC)
1947 ? tree.arg.type
1948 : operator.type.getReturnType();
1949 int opc = ((OperatorSymbol)operator).opcode;
1951 // If the argument is constant, fold it.
1952 if (argtype.constValue() != null) {
1953 Type ctype = cfolder.fold1(opc, argtype);
1954 if (ctype != null) {
1955 owntype = cfolder.coerce(ctype, owntype);
1957 // Remove constant types from arguments to
1958 // conserve space. The parser will fold concatenations
1959 // of string literals; the code here also
1960 // gets rid of intermediate results when some of the
1961 // operands are constant identifiers.
1962 if (tree.arg.type.tsym == syms.stringType.tsym) {
1963 tree.arg.type = syms.stringType;
1964 }
1965 }
1966 }
1967 }
1968 result = check(tree, owntype, VAL, pkind, pt);
1969 }
1971 public void visitBinary(JCBinary tree) {
1972 // Attribute arguments.
1973 Type left = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.lhs, env));
1974 Type right = chk.checkNonVoid(tree.lhs.pos(), attribExpr(tree.rhs, env));
1976 // Find operator.
1977 Symbol operator = tree.operator =
1978 rs.resolveBinaryOperator(tree.pos(), tree.getTag(), env, left, right);
1980 Type owntype = types.createErrorType(tree.type);
1981 if (operator.kind == MTH) {
1982 owntype = operator.type.getReturnType();
1983 int opc = chk.checkOperator(tree.lhs.pos(),
1984 (OperatorSymbol)operator,
1985 tree.getTag(),
1986 left,
1987 right);
1989 // If both arguments are constants, fold them.
1990 if (left.constValue() != null && right.constValue() != null) {
1991 Type ctype = cfolder.fold2(opc, left, right);
1992 if (ctype != null) {
1993 owntype = cfolder.coerce(ctype, owntype);
1995 // Remove constant types from arguments to
1996 // conserve space. The parser will fold concatenations
1997 // of string literals; the code here also
1998 // gets rid of intermediate results when some of the
1999 // operands are constant identifiers.
2000 if (tree.lhs.type.tsym == syms.stringType.tsym) {
2001 tree.lhs.type = syms.stringType;
2002 }
2003 if (tree.rhs.type.tsym == syms.stringType.tsym) {
2004 tree.rhs.type = syms.stringType;
2005 }
2006 }
2007 }
2009 // Check that argument types of a reference ==, != are
2010 // castable to each other, (JLS???).
2011 if ((opc == ByteCodes.if_acmpeq || opc == ByteCodes.if_acmpne)) {
2012 if (!types.isCastable(left, right, new Warner(tree.pos()))) {
2013 log.error(tree.pos(), "incomparable.types", left, right);
2014 }
2015 }
2017 chk.checkDivZero(tree.rhs.pos(), operator, right);
2018 }
2019 result = check(tree, owntype, VAL, pkind, pt);
2020 }
2022 public void visitTypeCast(JCTypeCast tree) {
2023 Type clazztype = attribType(tree.clazz, env);
2024 chk.validate(tree.clazz, env, false);
2025 //a fresh environment is required for 292 inference to work properly ---
2026 //see Infer.instantiatePolymorphicSignatureInstance()
2027 Env<AttrContext> localEnv = env.dup(tree);
2028 Type exprtype = attribExpr(tree.expr, localEnv, Infer.anyPoly);
2029 Type owntype = chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2030 if (exprtype.constValue() != null)
2031 owntype = cfolder.coerce(exprtype, owntype);
2032 result = check(tree, capture(owntype), VAL, pkind, pt);
2033 }
2035 public void visitTypeTest(JCInstanceOf tree) {
2036 Type exprtype = chk.checkNullOrRefType(
2037 tree.expr.pos(), attribExpr(tree.expr, env));
2038 Type clazztype = chk.checkReifiableReferenceType(
2039 tree.clazz.pos(), attribType(tree.clazz, env));
2040 chk.validate(tree.clazz, env, false);
2041 chk.checkCastable(tree.expr.pos(), exprtype, clazztype);
2042 result = check(tree, syms.booleanType, VAL, pkind, pt);
2043 }
2045 public void visitIndexed(JCArrayAccess tree) {
2046 Type owntype = types.createErrorType(tree.type);
2047 Type atype = attribExpr(tree.indexed, env);
2048 attribExpr(tree.index, env, syms.intType);
2049 if (types.isArray(atype))
2050 owntype = types.elemtype(atype);
2051 else if (atype.tag != ERROR)
2052 log.error(tree.pos(), "array.req.but.found", atype);
2053 if ((pkind & VAR) == 0) owntype = capture(owntype);
2054 result = check(tree, owntype, VAR, pkind, pt);
2055 }
2057 public void visitIdent(JCIdent tree) {
2058 Symbol sym;
2059 boolean varArgs = false;
2061 // Find symbol
2062 if (pt.tag == METHOD || pt.tag == FORALL) {
2063 // If we are looking for a method, the prototype `pt' will be a
2064 // method type with the type of the call's arguments as parameters.
2065 env.info.varArgs = false;
2066 sym = rs.resolveMethod(tree.pos(), env, tree.name, pt.getParameterTypes(), pt.getTypeArguments());
2067 varArgs = env.info.varArgs;
2068 } else if (tree.sym != null && tree.sym.kind != VAR) {
2069 sym = tree.sym;
2070 } else {
2071 sym = rs.resolveIdent(tree.pos(), env, tree.name, pkind);
2072 }
2073 tree.sym = sym;
2075 // (1) Also find the environment current for the class where
2076 // sym is defined (`symEnv').
2077 // Only for pre-tiger versions (1.4 and earlier):
2078 // (2) Also determine whether we access symbol out of an anonymous
2079 // class in a this or super call. This is illegal for instance
2080 // members since such classes don't carry a this$n link.
2081 // (`noOuterThisPath').
2082 Env<AttrContext> symEnv = env;
2083 boolean noOuterThisPath = false;
2084 if (env.enclClass.sym.owner.kind != PCK && // we are in an inner class
2085 (sym.kind & (VAR | MTH | TYP)) != 0 &&
2086 sym.owner.kind == TYP &&
2087 tree.name != names._this && tree.name != names._super) {
2089 // Find environment in which identifier is defined.
2090 while (symEnv.outer != null &&
2091 !sym.isMemberOf(symEnv.enclClass.sym, types)) {
2092 if ((symEnv.enclClass.sym.flags() & NOOUTERTHIS) != 0)
2093 noOuterThisPath = !allowAnonOuterThis;
2094 symEnv = symEnv.outer;
2095 }
2096 }
2098 // If symbol is a variable, ...
2099 if (sym.kind == VAR) {
2100 VarSymbol v = (VarSymbol)sym;
2102 // ..., evaluate its initializer, if it has one, and check for
2103 // illegal forward reference.
2104 checkInit(tree, env, v, false);
2106 // If symbol is a local variable accessed from an embedded
2107 // inner class check that it is final.
2108 if (v.owner.kind == MTH &&
2109 v.owner != env.info.scope.owner &&
2110 (v.flags_field & FINAL) == 0) {
2111 log.error(tree.pos(),
2112 "local.var.accessed.from.icls.needs.final",
2113 v);
2114 }
2116 // If we are expecting a variable (as opposed to a value), check
2117 // that the variable is assignable in the current environment.
2118 if (pkind == VAR)
2119 checkAssignable(tree.pos(), v, null, env);
2120 }
2122 // In a constructor body,
2123 // if symbol is a field or instance method, check that it is
2124 // not accessed before the supertype constructor is called.
2125 if ((symEnv.info.isSelfCall || noOuterThisPath) &&
2126 (sym.kind & (VAR | MTH)) != 0 &&
2127 sym.owner.kind == TYP &&
2128 (sym.flags() & STATIC) == 0) {
2129 chk.earlyRefError(tree.pos(), sym.kind == VAR ? sym : thisSym(tree.pos(), env));
2130 }
2131 Env<AttrContext> env1 = env;
2132 if (sym.kind != ERR && sym.kind != TYP && sym.owner != null && sym.owner != env1.enclClass.sym) {
2133 // If the found symbol is inaccessible, then it is
2134 // accessed through an enclosing instance. Locate this
2135 // enclosing instance:
2136 while (env1.outer != null && !rs.isAccessible(env, env1.enclClass.sym.type, sym))
2137 env1 = env1.outer;
2138 }
2139 result = checkId(tree, env1.enclClass.sym.type, sym, env, pkind, pt, varArgs);
2140 }
2142 public void visitSelect(JCFieldAccess tree) {
2143 // Determine the expected kind of the qualifier expression.
2144 int skind = 0;
2145 if (tree.name == names._this || tree.name == names._super ||
2146 tree.name == names._class)
2147 {
2148 skind = TYP;
2149 } else {
2150 if ((pkind & PCK) != 0) skind = skind | PCK;
2151 if ((pkind & TYP) != 0) skind = skind | TYP | PCK;
2152 if ((pkind & (VAL | MTH)) != 0) skind = skind | VAL | TYP;
2153 }
2155 // Attribute the qualifier expression, and determine its symbol (if any).
2156 Type site = attribTree(tree.selected, env, skind, Infer.anyPoly);
2157 if ((pkind & (PCK | TYP)) == 0)
2158 site = capture(site); // Capture field access
2160 // don't allow T.class T[].class, etc
2161 if (skind == TYP) {
2162 Type elt = site;
2163 while (elt.tag == ARRAY)
2164 elt = ((ArrayType)elt).elemtype;
2165 if (elt.tag == TYPEVAR) {
2166 log.error(tree.pos(), "type.var.cant.be.deref");
2167 result = types.createErrorType(tree.type);
2168 return;
2169 }
2170 }
2172 // If qualifier symbol is a type or `super', assert `selectSuper'
2173 // for the selection. This is relevant for determining whether
2174 // protected symbols are accessible.
2175 Symbol sitesym = TreeInfo.symbol(tree.selected);
2176 boolean selectSuperPrev = env.info.selectSuper;
2177 env.info.selectSuper =
2178 sitesym != null &&
2179 sitesym.name == names._super;
2181 // If selected expression is polymorphic, strip
2182 // type parameters and remember in env.info.tvars, so that
2183 // they can be added later (in Attr.checkId and Infer.instantiateMethod).
2184 if (tree.selected.type.tag == FORALL) {
2185 ForAll pstype = (ForAll)tree.selected.type;
2186 env.info.tvars = pstype.tvars;
2187 site = tree.selected.type = pstype.qtype;
2188 }
2190 // Determine the symbol represented by the selection.
2191 env.info.varArgs = false;
2192 Symbol sym = selectSym(tree, site, env, pt, pkind);
2193 if (sym.exists() && !isType(sym) && (pkind & (PCK | TYP)) != 0) {
2194 site = capture(site);
2195 sym = selectSym(tree, site, env, pt, pkind);
2196 }
2197 boolean varArgs = env.info.varArgs;
2198 tree.sym = sym;
2200 if (site.tag == TYPEVAR && !isType(sym) && sym.kind != ERR) {
2201 while (site.tag == TYPEVAR) site = site.getUpperBound();
2202 site = capture(site);
2203 }
2205 // If that symbol is a variable, ...
2206 if (sym.kind == VAR) {
2207 VarSymbol v = (VarSymbol)sym;
2209 // ..., evaluate its initializer, if it has one, and check for
2210 // illegal forward reference.
2211 checkInit(tree, env, v, true);
2213 // If we are expecting a variable (as opposed to a value), check
2214 // that the variable is assignable in the current environment.
2215 if (pkind == VAR)
2216 checkAssignable(tree.pos(), v, tree.selected, env);
2217 }
2219 if (sitesym != null &&
2220 sitesym.kind == VAR &&
2221 ((VarSymbol)sitesym).isResourceVariable() &&
2222 sym.kind == MTH &&
2223 sym.overrides(syms.autoCloseableClose, sitesym.type.tsym, types, true) &&
2224 env.info.lint.isEnabled(Lint.LintCategory.ARM)) {
2225 log.warning(tree, "twr.explicit.close.call");
2226 }
2228 // Disallow selecting a type from an expression
2229 if (isType(sym) && (sitesym==null || (sitesym.kind&(TYP|PCK)) == 0)) {
2230 tree.type = check(tree.selected, pt,
2231 sitesym == null ? VAL : sitesym.kind, TYP|PCK, pt);
2232 }
2234 if (isType(sitesym)) {
2235 if (sym.name == names._this) {
2236 // If `C' is the currently compiled class, check that
2237 // C.this' does not appear in a call to a super(...)
2238 if (env.info.isSelfCall &&
2239 site.tsym == env.enclClass.sym) {
2240 chk.earlyRefError(tree.pos(), sym);
2241 }
2242 } else {
2243 // Check if type-qualified fields or methods are static (JLS)
2244 if ((sym.flags() & STATIC) == 0 &&
2245 sym.name != names._super &&
2246 (sym.kind == VAR || sym.kind == MTH)) {
2247 rs.access(rs.new StaticError(sym),
2248 tree.pos(), site, sym.name, true);
2249 }
2250 }
2251 } else if (sym.kind != ERR && (sym.flags() & STATIC) != 0 && sym.name != names._class) {
2252 // If the qualified item is not a type and the selected item is static, report
2253 // a warning. Make allowance for the class of an array type e.g. Object[].class)
2254 chk.warnStatic(tree, "static.not.qualified.by.type", Kinds.kindName(sym.kind), sym.owner);
2255 }
2257 // If we are selecting an instance member via a `super', ...
2258 if (env.info.selectSuper && (sym.flags() & STATIC) == 0) {
2260 // Check that super-qualified symbols are not abstract (JLS)
2261 rs.checkNonAbstract(tree.pos(), sym);
2263 if (site.isRaw()) {
2264 // Determine argument types for site.
2265 Type site1 = types.asSuper(env.enclClass.sym.type, site.tsym);
2266 if (site1 != null) site = site1;
2267 }
2268 }
2270 env.info.selectSuper = selectSuperPrev;
2271 result = checkId(tree, site, sym, env, pkind, pt, varArgs);
2272 env.info.tvars = List.nil();
2273 }
2274 //where
2275 /** Determine symbol referenced by a Select expression,
2276 *
2277 * @param tree The select tree.
2278 * @param site The type of the selected expression,
2279 * @param env The current environment.
2280 * @param pt The current prototype.
2281 * @param pkind The expected kind(s) of the Select expression.
2282 */
2283 private Symbol selectSym(JCFieldAccess tree,
2284 Type site,
2285 Env<AttrContext> env,
2286 Type pt,
2287 int pkind) {
2288 DiagnosticPosition pos = tree.pos();
2289 Name name = tree.name;
2291 switch (site.tag) {
2292 case PACKAGE:
2293 return rs.access(
2294 rs.findIdentInPackage(env, site.tsym, name, pkind),
2295 pos, site, name, true);
2296 case ARRAY:
2297 case CLASS:
2298 if (pt.tag == METHOD || pt.tag == FORALL) {
2299 return rs.resolveQualifiedMethod(
2300 pos, env, site, name, pt.getParameterTypes(), pt.getTypeArguments());
2301 } else if (name == names._this || name == names._super) {
2302 return rs.resolveSelf(pos, env, site.tsym, name);
2303 } else if (name == names._class) {
2304 // In this case, we have already made sure in
2305 // visitSelect that qualifier expression is a type.
2306 Type t = syms.classType;
2307 List<Type> typeargs = allowGenerics
2308 ? List.of(types.erasure(site))
2309 : List.<Type>nil();
2310 t = new ClassType(t.getEnclosingType(), typeargs, t.tsym);
2311 return new VarSymbol(
2312 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2313 } else {
2314 // We are seeing a plain identifier as selector.
2315 Symbol sym = rs.findIdentInType(env, site, name, pkind);
2316 if ((pkind & ERRONEOUS) == 0)
2317 sym = rs.access(sym, pos, site, name, true);
2318 return sym;
2319 }
2320 case WILDCARD:
2321 throw new AssertionError(tree);
2322 case TYPEVAR:
2323 // Normally, site.getUpperBound() shouldn't be null.
2324 // It should only happen during memberEnter/attribBase
2325 // when determining the super type which *must* be
2326 // done before attributing the type variables. In
2327 // other words, we are seeing this illegal program:
2328 // class B<T> extends A<T.foo> {}
2329 Symbol sym = (site.getUpperBound() != null)
2330 ? selectSym(tree, capture(site.getUpperBound()), env, pt, pkind)
2331 : null;
2332 if (sym == null) {
2333 log.error(pos, "type.var.cant.be.deref");
2334 return syms.errSymbol;
2335 } else {
2336 Symbol sym2 = (sym.flags() & Flags.PRIVATE) != 0 ?
2337 rs.new AccessError(env, site, sym) :
2338 sym;
2339 rs.access(sym2, pos, site, name, true);
2340 return sym;
2341 }
2342 case ERROR:
2343 // preserve identifier names through errors
2344 return types.createErrorType(name, site.tsym, site).tsym;
2345 default:
2346 // The qualifier expression is of a primitive type -- only
2347 // .class is allowed for these.
2348 if (name == names._class) {
2349 // In this case, we have already made sure in Select that
2350 // qualifier expression is a type.
2351 Type t = syms.classType;
2352 Type arg = types.boxedClass(site).type;
2353 t = new ClassType(t.getEnclosingType(), List.of(arg), t.tsym);
2354 return new VarSymbol(
2355 STATIC | PUBLIC | FINAL, names._class, t, site.tsym);
2356 } else {
2357 log.error(pos, "cant.deref", site);
2358 return syms.errSymbol;
2359 }
2360 }
2361 }
2363 /** Determine type of identifier or select expression and check that
2364 * (1) the referenced symbol is not deprecated
2365 * (2) the symbol's type is safe (@see checkSafe)
2366 * (3) if symbol is a variable, check that its type and kind are
2367 * compatible with the prototype and protokind.
2368 * (4) if symbol is an instance field of a raw type,
2369 * which is being assigned to, issue an unchecked warning if its
2370 * type changes under erasure.
2371 * (5) if symbol is an instance method of a raw type, issue an
2372 * unchecked warning if its argument types change under erasure.
2373 * If checks succeed:
2374 * If symbol is a constant, return its constant type
2375 * else if symbol is a method, return its result type
2376 * otherwise return its type.
2377 * Otherwise return errType.
2378 *
2379 * @param tree The syntax tree representing the identifier
2380 * @param site If this is a select, the type of the selected
2381 * expression, otherwise the type of the current class.
2382 * @param sym The symbol representing the identifier.
2383 * @param env The current environment.
2384 * @param pkind The set of expected kinds.
2385 * @param pt The expected type.
2386 */
2387 Type checkId(JCTree tree,
2388 Type site,
2389 Symbol sym,
2390 Env<AttrContext> env,
2391 int pkind,
2392 Type pt,
2393 boolean useVarargs) {
2394 if (pt.isErroneous()) return types.createErrorType(site);
2395 Type owntype; // The computed type of this identifier occurrence.
2396 switch (sym.kind) {
2397 case TYP:
2398 // For types, the computed type equals the symbol's type,
2399 // except for two situations:
2400 owntype = sym.type;
2401 if (owntype.tag == CLASS) {
2402 Type ownOuter = owntype.getEnclosingType();
2404 // (a) If the symbol's type is parameterized, erase it
2405 // because no type parameters were given.
2406 // We recover generic outer type later in visitTypeApply.
2407 if (owntype.tsym.type.getTypeArguments().nonEmpty()) {
2408 owntype = types.erasure(owntype);
2409 }
2411 // (b) If the symbol's type is an inner class, then
2412 // we have to interpret its outer type as a superclass
2413 // of the site type. Example:
2414 //
2415 // class Tree<A> { class Visitor { ... } }
2416 // class PointTree extends Tree<Point> { ... }
2417 // ...PointTree.Visitor...
2418 //
2419 // Then the type of the last expression above is
2420 // Tree<Point>.Visitor.
2421 else if (ownOuter.tag == CLASS && site != ownOuter) {
2422 Type normOuter = site;
2423 if (normOuter.tag == CLASS)
2424 normOuter = types.asEnclosingSuper(site, ownOuter.tsym);
2425 if (normOuter == null) // perhaps from an import
2426 normOuter = types.erasure(ownOuter);
2427 if (normOuter != ownOuter)
2428 owntype = new ClassType(
2429 normOuter, List.<Type>nil(), owntype.tsym);
2430 }
2431 }
2432 break;
2433 case VAR:
2434 VarSymbol v = (VarSymbol)sym;
2435 // Test (4): if symbol is an instance field of a raw type,
2436 // which is being assigned to, issue an unchecked warning if
2437 // its type changes under erasure.
2438 if (allowGenerics &&
2439 pkind == VAR &&
2440 v.owner.kind == TYP &&
2441 (v.flags() & STATIC) == 0 &&
2442 (site.tag == CLASS || site.tag == TYPEVAR)) {
2443 Type s = types.asOuterSuper(site, v.owner);
2444 if (s != null &&
2445 s.isRaw() &&
2446 !types.isSameType(v.type, v.erasure(types))) {
2447 chk.warnUnchecked(tree.pos(),
2448 "unchecked.assign.to.var",
2449 v, s);
2450 }
2451 }
2452 // The computed type of a variable is the type of the
2453 // variable symbol, taken as a member of the site type.
2454 owntype = (sym.owner.kind == TYP &&
2455 sym.name != names._this && sym.name != names._super)
2456 ? types.memberType(site, sym)
2457 : sym.type;
2459 if (env.info.tvars.nonEmpty()) {
2460 Type owntype1 = new ForAll(env.info.tvars, owntype);
2461 for (List<Type> l = env.info.tvars; l.nonEmpty(); l = l.tail)
2462 if (!owntype.contains(l.head)) {
2463 log.error(tree.pos(), "undetermined.type", owntype1);
2464 owntype1 = types.createErrorType(owntype1);
2465 }
2466 owntype = owntype1;
2467 }
2469 // If the variable is a constant, record constant value in
2470 // computed type.
2471 if (v.getConstValue() != null && isStaticReference(tree))
2472 owntype = owntype.constType(v.getConstValue());
2474 if (pkind == VAL) {
2475 owntype = capture(owntype); // capture "names as expressions"
2476 }
2477 break;
2478 case MTH: {
2479 JCMethodInvocation app = (JCMethodInvocation)env.tree;
2480 owntype = checkMethod(site, sym, env, app.args,
2481 pt.getParameterTypes(), pt.getTypeArguments(),
2482 env.info.varArgs);
2483 break;
2484 }
2485 case PCK: case ERR:
2486 owntype = sym.type;
2487 break;
2488 default:
2489 throw new AssertionError("unexpected kind: " + sym.kind +
2490 " in tree " + tree);
2491 }
2493 // Test (1): emit a `deprecation' warning if symbol is deprecated.
2494 // (for constructors, the error was given when the constructor was
2495 // resolved)
2496 if (sym.name != names.init &&
2497 (sym.flags() & DEPRECATED) != 0 &&
2498 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
2499 sym.outermostClass() != env.info.scope.owner.outermostClass())
2500 chk.warnDeprecated(tree.pos(), sym);
2502 if ((sym.flags() & PROPRIETARY) != 0) {
2503 if (enableSunApiLintControl)
2504 chk.warnSunApi(tree.pos(), "sun.proprietary", sym);
2505 else
2506 log.strictWarning(tree.pos(), "sun.proprietary", sym);
2507 }
2509 // Test (3): if symbol is a variable, check that its type and
2510 // kind are compatible with the prototype and protokind.
2511 return check(tree, owntype, sym.kind, pkind, pt);
2512 }
2514 /** Check that variable is initialized and evaluate the variable's
2515 * initializer, if not yet done. Also check that variable is not
2516 * referenced before it is defined.
2517 * @param tree The tree making up the variable reference.
2518 * @param env The current environment.
2519 * @param v The variable's symbol.
2520 */
2521 private void checkInit(JCTree tree,
2522 Env<AttrContext> env,
2523 VarSymbol v,
2524 boolean onlyWarning) {
2525 // System.err.println(v + " " + ((v.flags() & STATIC) != 0) + " " +
2526 // tree.pos + " " + v.pos + " " +
2527 // Resolve.isStatic(env));//DEBUG
2529 // A forward reference is diagnosed if the declaration position
2530 // of the variable is greater than the current tree position
2531 // and the tree and variable definition occur in the same class
2532 // definition. Note that writes don't count as references.
2533 // This check applies only to class and instance
2534 // variables. Local variables follow different scope rules,
2535 // and are subject to definite assignment checking.
2536 if ((env.info.enclVar == v || v.pos > tree.pos) &&
2537 v.owner.kind == TYP &&
2538 canOwnInitializer(env.info.scope.owner) &&
2539 v.owner == env.info.scope.owner.enclClass() &&
2540 ((v.flags() & STATIC) != 0) == Resolve.isStatic(env) &&
2541 (env.tree.getTag() != JCTree.ASSIGN ||
2542 TreeInfo.skipParens(((JCAssign) env.tree).lhs) != tree)) {
2543 String suffix = (env.info.enclVar == v) ?
2544 "self.ref" : "forward.ref";
2545 if (!onlyWarning || isStaticEnumField(v)) {
2546 log.error(tree.pos(), "illegal." + suffix);
2547 } else if (useBeforeDeclarationWarning) {
2548 log.warning(tree.pos(), suffix, v);
2549 }
2550 }
2552 v.getConstValue(); // ensure initializer is evaluated
2554 checkEnumInitializer(tree, env, v);
2555 }
2557 /**
2558 * Check for illegal references to static members of enum. In
2559 * an enum type, constructors and initializers may not
2560 * reference its static members unless they are constant.
2561 *
2562 * @param tree The tree making up the variable reference.
2563 * @param env The current environment.
2564 * @param v The variable's symbol.
2565 * @see JLS 3rd Ed. (8.9 Enums)
2566 */
2567 private void checkEnumInitializer(JCTree tree, Env<AttrContext> env, VarSymbol v) {
2568 // JLS 3rd Ed.:
2569 //
2570 // "It is a compile-time error to reference a static field
2571 // of an enum type that is not a compile-time constant
2572 // (15.28) from constructors, instance initializer blocks,
2573 // or instance variable initializer expressions of that
2574 // type. It is a compile-time error for the constructors,
2575 // instance initializer blocks, or instance variable
2576 // initializer expressions of an enum constant e to refer
2577 // to itself or to an enum constant of the same type that
2578 // is declared to the right of e."
2579 if (isStaticEnumField(v)) {
2580 ClassSymbol enclClass = env.info.scope.owner.enclClass();
2582 if (enclClass == null || enclClass.owner == null)
2583 return;
2585 // See if the enclosing class is the enum (or a
2586 // subclass thereof) declaring v. If not, this
2587 // reference is OK.
2588 if (v.owner != enclClass && !types.isSubtype(enclClass.type, v.owner.type))
2589 return;
2591 // If the reference isn't from an initializer, then
2592 // the reference is OK.
2593 if (!Resolve.isInitializer(env))
2594 return;
2596 log.error(tree.pos(), "illegal.enum.static.ref");
2597 }
2598 }
2600 /** Is the given symbol a static, non-constant field of an Enum?
2601 * Note: enum literals should not be regarded as such
2602 */
2603 private boolean isStaticEnumField(VarSymbol v) {
2604 return Flags.isEnum(v.owner) &&
2605 Flags.isStatic(v) &&
2606 !Flags.isConstant(v) &&
2607 v.name != names._class;
2608 }
2610 /** Can the given symbol be the owner of code which forms part
2611 * if class initialization? This is the case if the symbol is
2612 * a type or field, or if the symbol is the synthetic method.
2613 * owning a block.
2614 */
2615 private boolean canOwnInitializer(Symbol sym) {
2616 return
2617 (sym.kind & (VAR | TYP)) != 0 ||
2618 (sym.kind == MTH && (sym.flags() & BLOCK) != 0);
2619 }
2621 Warner noteWarner = new Warner();
2623 /**
2624 * Check that method arguments conform to its instantation.
2625 **/
2626 public Type checkMethod(Type site,
2627 Symbol sym,
2628 Env<AttrContext> env,
2629 final List<JCExpression> argtrees,
2630 List<Type> argtypes,
2631 List<Type> typeargtypes,
2632 boolean useVarargs) {
2633 // Test (5): if symbol is an instance method of a raw type, issue
2634 // an unchecked warning if its argument types change under erasure.
2635 if (allowGenerics &&
2636 (sym.flags() & STATIC) == 0 &&
2637 (site.tag == CLASS || site.tag == TYPEVAR)) {
2638 Type s = types.asOuterSuper(site, sym.owner);
2639 if (s != null && s.isRaw() &&
2640 !types.isSameTypes(sym.type.getParameterTypes(),
2641 sym.erasure(types).getParameterTypes())) {
2642 chk.warnUnchecked(env.tree.pos(),
2643 "unchecked.call.mbr.of.raw.type",
2644 sym, s);
2645 }
2646 }
2648 // Compute the identifier's instantiated type.
2649 // For methods, we need to compute the instance type by
2650 // Resolve.instantiate from the symbol's type as well as
2651 // any type arguments and value arguments.
2652 noteWarner.warned = false;
2653 Type owntype = rs.instantiate(env,
2654 site,
2655 sym,
2656 argtypes,
2657 typeargtypes,
2658 true,
2659 useVarargs,
2660 noteWarner);
2661 boolean warned = noteWarner.warned;
2663 // If this fails, something went wrong; we should not have
2664 // found the identifier in the first place.
2665 if (owntype == null) {
2666 if (!pt.isErroneous())
2667 log.error(env.tree.pos(),
2668 "internal.error.cant.instantiate",
2669 sym, site,
2670 Type.toString(pt.getParameterTypes()));
2671 owntype = types.createErrorType(site);
2672 } else {
2673 // System.out.println("call : " + env.tree);
2674 // System.out.println("method : " + owntype);
2675 // System.out.println("actuals: " + argtypes);
2676 List<Type> formals = owntype.getParameterTypes();
2677 Type last = useVarargs ? formals.last() : null;
2678 if (sym.name==names.init &&
2679 sym.owner == syms.enumSym)
2680 formals = formals.tail.tail;
2681 List<JCExpression> args = argtrees;
2682 while (formals.head != last) {
2683 JCTree arg = args.head;
2684 Warner warn = chk.convertWarner(arg.pos(), arg.type, formals.head);
2685 assertConvertible(arg, arg.type, formals.head, warn);
2686 warned |= warn.warned;
2687 args = args.tail;
2688 formals = formals.tail;
2689 }
2690 if (useVarargs) {
2691 Type varArg = types.elemtype(last);
2692 while (args.tail != null) {
2693 JCTree arg = args.head;
2694 Warner warn = chk.convertWarner(arg.pos(), arg.type, varArg);
2695 assertConvertible(arg, arg.type, varArg, warn);
2696 warned |= warn.warned;
2697 args = args.tail;
2698 }
2699 } else if ((sym.flags() & VARARGS) != 0 && allowVarargs) {
2700 // non-varargs call to varargs method
2701 Type varParam = owntype.getParameterTypes().last();
2702 Type lastArg = argtypes.last();
2703 if (types.isSubtypeUnchecked(lastArg, types.elemtype(varParam)) &&
2704 !types.isSameType(types.erasure(varParam), types.erasure(lastArg)))
2705 log.warning(argtrees.last().pos(), "inexact.non-varargs.call",
2706 types.elemtype(varParam),
2707 varParam);
2708 }
2710 if (warned && sym.type.tag == FORALL) {
2711 chk.warnUnchecked(env.tree.pos(),
2712 "unchecked.meth.invocation.applied",
2713 kindName(sym),
2714 sym.name,
2715 rs.methodArguments(sym.type.getParameterTypes()),
2716 rs.methodArguments(argtypes),
2717 kindName(sym.location()),
2718 sym.location());
2719 owntype = new MethodType(owntype.getParameterTypes(),
2720 types.erasure(owntype.getReturnType()),
2721 owntype.getThrownTypes(),
2722 syms.methodClass);
2723 }
2724 if (useVarargs) {
2725 JCTree tree = env.tree;
2726 Type argtype = owntype.getParameterTypes().last();
2727 if (owntype.getReturnType().tag != FORALL || warned) {
2728 chk.checkVararg(env.tree.pos(), owntype.getParameterTypes(), sym, env);
2729 }
2730 Type elemtype = types.elemtype(argtype);
2731 switch (tree.getTag()) {
2732 case JCTree.APPLY:
2733 ((JCMethodInvocation) tree).varargsElement = elemtype;
2734 break;
2735 case JCTree.NEWCLASS:
2736 ((JCNewClass) tree).varargsElement = elemtype;
2737 break;
2738 default:
2739 throw new AssertionError(""+tree);
2740 }
2741 }
2742 }
2743 return owntype;
2744 }
2746 private void assertConvertible(JCTree tree, Type actual, Type formal, Warner warn) {
2747 if (types.isConvertible(actual, formal, warn))
2748 return;
2750 if (formal.isCompound()
2751 && types.isSubtype(actual, types.supertype(formal))
2752 && types.isSubtypeUnchecked(actual, types.interfaces(formal), warn))
2753 return;
2755 if (false) {
2756 // TODO: make assertConvertible work
2757 chk.typeError(tree.pos(), diags.fragment("incompatible.types"), actual, formal);
2758 throw new AssertionError("Tree: " + tree
2759 + " actual:" + actual
2760 + " formal: " + formal);
2761 }
2762 }
2764 public void visitLiteral(JCLiteral tree) {
2765 result = check(
2766 tree, litType(tree.typetag).constType(tree.value), VAL, pkind, pt);
2767 }
2768 //where
2769 /** Return the type of a literal with given type tag.
2770 */
2771 Type litType(int tag) {
2772 return (tag == TypeTags.CLASS) ? syms.stringType : syms.typeOfTag[tag];
2773 }
2775 public void visitTypeIdent(JCPrimitiveTypeTree tree) {
2776 result = check(tree, syms.typeOfTag[tree.typetag], TYP, pkind, pt);
2777 }
2779 public void visitTypeArray(JCArrayTypeTree tree) {
2780 Type etype = attribType(tree.elemtype, env);
2781 Type type = new ArrayType(etype, syms.arrayClass);
2782 result = check(tree, type, TYP, pkind, pt);
2783 }
2785 /** Visitor method for parameterized types.
2786 * Bound checking is left until later, since types are attributed
2787 * before supertype structure is completely known
2788 */
2789 public void visitTypeApply(JCTypeApply tree) {
2790 Type owntype = types.createErrorType(tree.type);
2792 // Attribute functor part of application and make sure it's a class.
2793 Type clazztype = chk.checkClassType(tree.clazz.pos(), attribType(tree.clazz, env));
2795 // Attribute type parameters
2796 List<Type> actuals = attribTypes(tree.arguments, env);
2798 if (clazztype.tag == CLASS) {
2799 List<Type> formals = clazztype.tsym.type.getTypeArguments();
2801 if (actuals.length() == formals.length() || actuals.length() == 0) {
2802 List<Type> a = actuals;
2803 List<Type> f = formals;
2804 while (a.nonEmpty()) {
2805 a.head = a.head.withTypeVar(f.head);
2806 a = a.tail;
2807 f = f.tail;
2808 }
2809 // Compute the proper generic outer
2810 Type clazzOuter = clazztype.getEnclosingType();
2811 if (clazzOuter.tag == CLASS) {
2812 Type site;
2813 JCExpression clazz = TreeInfo.typeIn(tree.clazz);
2814 if (clazz.getTag() == JCTree.IDENT) {
2815 site = env.enclClass.sym.type;
2816 } else if (clazz.getTag() == JCTree.SELECT) {
2817 site = ((JCFieldAccess) clazz).selected.type;
2818 } else throw new AssertionError(""+tree);
2819 if (clazzOuter.tag == CLASS && site != clazzOuter) {
2820 if (site.tag == CLASS)
2821 site = types.asOuterSuper(site, clazzOuter.tsym);
2822 if (site == null)
2823 site = types.erasure(clazzOuter);
2824 clazzOuter = site;
2825 }
2826 }
2827 owntype = new ClassType(clazzOuter, actuals, clazztype.tsym);
2828 } else {
2829 if (formals.length() != 0) {
2830 log.error(tree.pos(), "wrong.number.type.args",
2831 Integer.toString(formals.length()));
2832 } else {
2833 log.error(tree.pos(), "type.doesnt.take.params", clazztype.tsym);
2834 }
2835 owntype = types.createErrorType(tree.type);
2836 }
2837 }
2838 result = check(tree, owntype, TYP, pkind, pt);
2839 }
2841 public void visitTypeDisjoint(JCTypeDisjoint tree) {
2842 List<Type> componentTypes = attribTypes(tree.components, env);
2843 tree.type = result = check(tree, types.lub(componentTypes), TYP, pkind, pt);
2844 }
2846 public void visitTypeParameter(JCTypeParameter tree) {
2847 TypeVar a = (TypeVar)tree.type;
2848 Set<Type> boundSet = new HashSet<Type>();
2849 if (a.bound.isErroneous())
2850 return;
2851 List<Type> bs = types.getBounds(a);
2852 if (tree.bounds.nonEmpty()) {
2853 // accept class or interface or typevar as first bound.
2854 Type b = checkBase(bs.head, tree.bounds.head, env, false, false, false);
2855 boundSet.add(types.erasure(b));
2856 if (b.isErroneous()) {
2857 a.bound = b;
2858 }
2859 else if (b.tag == TYPEVAR) {
2860 // if first bound was a typevar, do not accept further bounds.
2861 if (tree.bounds.tail.nonEmpty()) {
2862 log.error(tree.bounds.tail.head.pos(),
2863 "type.var.may.not.be.followed.by.other.bounds");
2864 tree.bounds = List.of(tree.bounds.head);
2865 a.bound = bs.head;
2866 }
2867 } else {
2868 // if first bound was a class or interface, accept only interfaces
2869 // as further bounds.
2870 for (JCExpression bound : tree.bounds.tail) {
2871 bs = bs.tail;
2872 Type i = checkBase(bs.head, bound, env, false, true, false);
2873 if (i.isErroneous())
2874 a.bound = i;
2875 else if (i.tag == CLASS)
2876 chk.checkNotRepeated(bound.pos(), types.erasure(i), boundSet);
2877 }
2878 }
2879 }
2880 bs = types.getBounds(a);
2882 // in case of multiple bounds ...
2883 if (bs.length() > 1) {
2884 // ... the variable's bound is a class type flagged COMPOUND
2885 // (see comment for TypeVar.bound).
2886 // In this case, generate a class tree that represents the
2887 // bound class, ...
2888 JCTree extending;
2889 List<JCExpression> implementing;
2890 if ((bs.head.tsym.flags() & INTERFACE) == 0) {
2891 extending = tree.bounds.head;
2892 implementing = tree.bounds.tail;
2893 } else {
2894 extending = null;
2895 implementing = tree.bounds;
2896 }
2897 JCClassDecl cd = make.at(tree.pos).ClassDef(
2898 make.Modifiers(PUBLIC | ABSTRACT),
2899 tree.name, List.<JCTypeParameter>nil(),
2900 extending, implementing, List.<JCTree>nil());
2902 ClassSymbol c = (ClassSymbol)a.getUpperBound().tsym;
2903 assert (c.flags() & COMPOUND) != 0;
2904 cd.sym = c;
2905 c.sourcefile = env.toplevel.sourcefile;
2907 // ... and attribute the bound class
2908 c.flags_field |= UNATTRIBUTED;
2909 Env<AttrContext> cenv = enter.classEnv(cd, env);
2910 enter.typeEnvs.put(c, cenv);
2911 }
2912 }
2915 public void visitWildcard(JCWildcard tree) {
2916 //- System.err.println("visitWildcard("+tree+");");//DEBUG
2917 Type type = (tree.kind.kind == BoundKind.UNBOUND)
2918 ? syms.objectType
2919 : attribType(tree.inner, env);
2920 result = check(tree, new WildcardType(chk.checkRefType(tree.pos(), type),
2921 tree.kind.kind,
2922 syms.boundClass),
2923 TYP, pkind, pt);
2924 }
2926 public void visitAnnotation(JCAnnotation tree) {
2927 log.error(tree.pos(), "annotation.not.valid.for.type", pt);
2928 result = tree.type = syms.errType;
2929 }
2931 public void visitAnnotatedType(JCAnnotatedType tree) {
2932 result = tree.type = attribType(tree.getUnderlyingType(), env);
2933 }
2935 public void visitErroneous(JCErroneous tree) {
2936 if (tree.errs != null)
2937 for (JCTree err : tree.errs)
2938 attribTree(err, env, ERR, pt);
2939 result = tree.type = syms.errType;
2940 }
2942 /** Default visitor method for all other trees.
2943 */
2944 public void visitTree(JCTree tree) {
2945 throw new AssertionError();
2946 }
2948 /** Main method: attribute class definition associated with given class symbol.
2949 * reporting completion failures at the given position.
2950 * @param pos The source position at which completion errors are to be
2951 * reported.
2952 * @param c The class symbol whose definition will be attributed.
2953 */
2954 public void attribClass(DiagnosticPosition pos, ClassSymbol c) {
2955 try {
2956 annotate.flush();
2957 attribClass(c);
2958 } catch (CompletionFailure ex) {
2959 chk.completionError(pos, ex);
2960 }
2961 }
2963 /** Attribute class definition associated with given class symbol.
2964 * @param c The class symbol whose definition will be attributed.
2965 */
2966 void attribClass(ClassSymbol c) throws CompletionFailure {
2967 if (c.type.tag == ERROR) return;
2969 // Check for cycles in the inheritance graph, which can arise from
2970 // ill-formed class files.
2971 chk.checkNonCyclic(null, c.type);
2973 Type st = types.supertype(c.type);
2974 if ((c.flags_field & Flags.COMPOUND) == 0) {
2975 // First, attribute superclass.
2976 if (st.tag == CLASS)
2977 attribClass((ClassSymbol)st.tsym);
2979 // Next attribute owner, if it is a class.
2980 if (c.owner.kind == TYP && c.owner.type.tag == CLASS)
2981 attribClass((ClassSymbol)c.owner);
2982 }
2984 // The previous operations might have attributed the current class
2985 // if there was a cycle. So we test first whether the class is still
2986 // UNATTRIBUTED.
2987 if ((c.flags_field & UNATTRIBUTED) != 0) {
2988 c.flags_field &= ~UNATTRIBUTED;
2990 // Get environment current at the point of class definition.
2991 Env<AttrContext> env = enter.typeEnvs.get(c);
2993 // The info.lint field in the envs stored in enter.typeEnvs is deliberately uninitialized,
2994 // because the annotations were not available at the time the env was created. Therefore,
2995 // we look up the environment chain for the first enclosing environment for which the
2996 // lint value is set. Typically, this is the parent env, but might be further if there
2997 // are any envs created as a result of TypeParameter nodes.
2998 Env<AttrContext> lintEnv = env;
2999 while (lintEnv.info.lint == null)
3000 lintEnv = lintEnv.next;
3002 // Having found the enclosing lint value, we can initialize the lint value for this class
3003 env.info.lint = lintEnv.info.lint.augment(c.attributes_field, c.flags());
3005 Lint prevLint = chk.setLint(env.info.lint);
3006 JavaFileObject prev = log.useSource(c.sourcefile);
3008 try {
3009 // java.lang.Enum may not be subclassed by a non-enum
3010 if (st.tsym == syms.enumSym &&
3011 ((c.flags_field & (Flags.ENUM|Flags.COMPOUND)) == 0))
3012 log.error(env.tree.pos(), "enum.no.subclassing");
3014 // Enums may not be extended by source-level classes
3015 if (st.tsym != null &&
3016 ((st.tsym.flags_field & Flags.ENUM) != 0) &&
3017 ((c.flags_field & (Flags.ENUM | Flags.COMPOUND)) == 0) &&
3018 !target.compilerBootstrap(c)) {
3019 log.error(env.tree.pos(), "enum.types.not.extensible");
3020 }
3021 attribClassBody(env, c);
3023 chk.checkDeprecatedAnnotation(env.tree.pos(), c);
3024 } finally {
3025 log.useSource(prev);
3026 chk.setLint(prevLint);
3027 }
3029 }
3030 }
3032 public void visitImport(JCImport tree) {
3033 // nothing to do
3034 }
3036 /** Finish the attribution of a class. */
3037 private void attribClassBody(Env<AttrContext> env, ClassSymbol c) {
3038 JCClassDecl tree = (JCClassDecl)env.tree;
3039 assert c == tree.sym;
3041 // Validate annotations
3042 chk.validateAnnotations(tree.mods.annotations, c);
3044 // Validate type parameters, supertype and interfaces.
3045 attribBounds(tree.typarams);
3046 if (!c.isAnonymous()) {
3047 //already checked if anonymous
3048 chk.validate(tree.typarams, env);
3049 chk.validate(tree.extending, env);
3050 chk.validate(tree.implementing, env);
3051 }
3053 // If this is a non-abstract class, check that it has no abstract
3054 // methods or unimplemented methods of an implemented interface.
3055 if ((c.flags() & (ABSTRACT | INTERFACE)) == 0) {
3056 if (!relax)
3057 chk.checkAllDefined(tree.pos(), c);
3058 }
3060 if ((c.flags() & ANNOTATION) != 0) {
3061 if (tree.implementing.nonEmpty())
3062 log.error(tree.implementing.head.pos(),
3063 "cant.extend.intf.annotation");
3064 if (tree.typarams.nonEmpty())
3065 log.error(tree.typarams.head.pos(),
3066 "intf.annotation.cant.have.type.params");
3067 } else {
3068 // Check that all extended classes and interfaces
3069 // are compatible (i.e. no two define methods with same arguments
3070 // yet different return types). (JLS 8.4.6.3)
3071 chk.checkCompatibleSupertypes(tree.pos(), c.type);
3072 }
3074 // Check that class does not import the same parameterized interface
3075 // with two different argument lists.
3076 chk.checkClassBounds(tree.pos(), c.type);
3078 tree.type = c.type;
3080 boolean assertsEnabled = false;
3081 assert assertsEnabled = true;
3082 if (assertsEnabled) {
3083 for (List<JCTypeParameter> l = tree.typarams;
3084 l.nonEmpty(); l = l.tail)
3085 assert env.info.scope.lookup(l.head.name).scope != null;
3086 }
3088 // Check that a generic class doesn't extend Throwable
3089 if (!c.type.allparams().isEmpty() && types.isSubtype(c.type, syms.throwableType))
3090 log.error(tree.extending.pos(), "generic.throwable");
3092 // Check that all methods which implement some
3093 // method conform to the method they implement.
3094 chk.checkImplementations(tree);
3096 for (List<JCTree> l = tree.defs; l.nonEmpty(); l = l.tail) {
3097 // Attribute declaration
3098 attribStat(l.head, env);
3099 // Check that declarations in inner classes are not static (JLS 8.1.2)
3100 // Make an exception for static constants.
3101 if (c.owner.kind != PCK &&
3102 ((c.flags() & STATIC) == 0 || c.name == names.empty) &&
3103 (TreeInfo.flags(l.head) & (STATIC | INTERFACE)) != 0) {
3104 Symbol sym = null;
3105 if (l.head.getTag() == JCTree.VARDEF) sym = ((JCVariableDecl) l.head).sym;
3106 if (sym == null ||
3107 sym.kind != VAR ||
3108 ((VarSymbol) sym).getConstValue() == null)
3109 log.error(l.head.pos(), "icls.cant.have.static.decl");
3110 }
3111 }
3113 // Check for cycles among non-initial constructors.
3114 chk.checkCyclicConstructors(tree);
3116 // Check for cycles among annotation elements.
3117 chk.checkNonCyclicElements(tree);
3119 // Check for proper use of serialVersionUID
3120 if (env.info.lint.isEnabled(Lint.LintCategory.SERIAL) &&
3121 isSerializable(c) &&
3122 (c.flags() & Flags.ENUM) == 0 &&
3123 (c.flags() & ABSTRACT) == 0) {
3124 checkSerialVersionUID(tree, c);
3125 }
3127 // Check type annotations applicability rules
3128 validateTypeAnnotations(tree);
3129 }
3130 // where
3131 /** check if a class is a subtype of Serializable, if that is available. */
3132 private boolean isSerializable(ClassSymbol c) {
3133 try {
3134 syms.serializableType.complete();
3135 }
3136 catch (CompletionFailure e) {
3137 return false;
3138 }
3139 return types.isSubtype(c.type, syms.serializableType);
3140 }
3142 /** Check that an appropriate serialVersionUID member is defined. */
3143 private void checkSerialVersionUID(JCClassDecl tree, ClassSymbol c) {
3145 // check for presence of serialVersionUID
3146 Scope.Entry e = c.members().lookup(names.serialVersionUID);
3147 while (e.scope != null && e.sym.kind != VAR) e = e.next();
3148 if (e.scope == null) {
3149 log.warning(Lint.LintCategory.SERIAL,
3150 tree.pos(), "missing.SVUID", c);
3151 return;
3152 }
3154 // check that it is static final
3155 VarSymbol svuid = (VarSymbol)e.sym;
3156 if ((svuid.flags() & (STATIC | FINAL)) !=
3157 (STATIC | FINAL))
3158 log.warning(Lint.LintCategory.SERIAL,
3159 TreeInfo.diagnosticPositionFor(svuid, tree), "improper.SVUID", c);
3161 // check that it is long
3162 else if (svuid.type.tag != TypeTags.LONG)
3163 log.warning(Lint.LintCategory.SERIAL,
3164 TreeInfo.diagnosticPositionFor(svuid, tree), "long.SVUID", c);
3166 // check constant
3167 else if (svuid.getConstValue() == null)
3168 log.warning(Lint.LintCategory.SERIAL,
3169 TreeInfo.diagnosticPositionFor(svuid, tree), "constant.SVUID", c);
3170 }
3172 private Type capture(Type type) {
3173 return types.capture(type);
3174 }
3176 private void validateTypeAnnotations(JCTree tree) {
3177 tree.accept(typeAnnotationsValidator);
3178 }
3179 //where
3180 private final JCTree.Visitor typeAnnotationsValidator =
3181 new TreeScanner() {
3182 public void visitAnnotation(JCAnnotation tree) {
3183 if (tree instanceof JCTypeAnnotation) {
3184 chk.validateTypeAnnotation((JCTypeAnnotation)tree, false);
3185 }
3186 super.visitAnnotation(tree);
3187 }
3188 public void visitTypeParameter(JCTypeParameter tree) {
3189 chk.validateTypeAnnotations(tree.annotations, true);
3190 // don't call super. skip type annotations
3191 scan(tree.bounds);
3192 }
3193 public void visitMethodDef(JCMethodDecl tree) {
3194 // need to check static methods
3195 if ((tree.sym.flags() & Flags.STATIC) != 0) {
3196 for (JCTypeAnnotation a : tree.receiverAnnotations) {
3197 if (chk.isTypeAnnotation(a, false))
3198 log.error(a.pos(), "annotation.type.not.applicable");
3199 }
3200 }
3201 super.visitMethodDef(tree);
3202 }
3203 };
3204 }
