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src/share/classes/com/sun/tools/javac/comp/Resolve.java@14979dd5e034
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Fri, 02 May 2014 01:25:26 +0100
- author
- vromero
- date
- Fri, 02 May 2014 01:25:26 +0100
- changeset 2382
- 14979dd5e034
- parent 2368
- 0524f786d7e8
- child 2384
- 327122b01a9e
- permissions
- -rw-r--r--
8030741: Inference: implement eager resolution of return types, consistent with JDK-8028800
Reviewed-by: dlsmith, jjg
1 /*
2 * Copyright (c) 1999, 2014, 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 com.sun.source.tree.MemberReferenceTree.ReferenceMode;
29 import com.sun.tools.javac.api.Formattable.LocalizedString;
30 import com.sun.tools.javac.code.*;
31 import com.sun.tools.javac.code.Symbol.*;
32 import com.sun.tools.javac.code.Type.*;
33 import com.sun.tools.javac.comp.Attr.ResultInfo;
34 import com.sun.tools.javac.comp.Check.CheckContext;
35 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
36 import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
37 import com.sun.tools.javac.comp.DeferredAttr.DeferredType;
38 import com.sun.tools.javac.comp.Infer.InferenceContext;
39 import com.sun.tools.javac.comp.Infer.FreeTypeListener;
40 import com.sun.tools.javac.comp.Resolve.MethodResolutionContext.Candidate;
41 import com.sun.tools.javac.comp.Resolve.MethodResolutionDiagHelper.DiagnosticRewriter;
42 import com.sun.tools.javac.comp.Resolve.MethodResolutionDiagHelper.Template;
43 import com.sun.tools.javac.jvm.*;
44 import com.sun.tools.javac.main.Option;
45 import com.sun.tools.javac.tree.*;
46 import com.sun.tools.javac.tree.JCTree.*;
47 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
48 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
49 import com.sun.tools.javac.util.*;
50 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
51 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
52 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
54 import java.util.Arrays;
55 import java.util.Collection;
56 import java.util.EnumMap;
57 import java.util.EnumSet;
58 import java.util.Iterator;
59 import java.util.LinkedHashMap;
60 import java.util.LinkedHashSet;
61 import java.util.Map;
63 import javax.lang.model.element.ElementVisitor;
65 import static com.sun.tools.javac.code.Flags.*;
66 import static com.sun.tools.javac.code.Flags.BLOCK;
67 import static com.sun.tools.javac.code.Kinds.*;
68 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
69 import static com.sun.tools.javac.code.TypeTag.*;
70 import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
71 import static com.sun.tools.javac.tree.JCTree.Tag.*;
73 /** Helper class for name resolution, used mostly by the attribution phase.
74 *
75 * <p><b>This is NOT part of any supported API.
76 * If you write code that depends on this, you do so at your own risk.
77 * This code and its internal interfaces are subject to change or
78 * deletion without notice.</b>
79 */
80 public class Resolve {
81 protected static final Context.Key<Resolve> resolveKey =
82 new Context.Key<Resolve>();
84 Names names;
85 Log log;
86 Symtab syms;
87 Attr attr;
88 DeferredAttr deferredAttr;
89 Check chk;
90 Infer infer;
91 ClassReader reader;
92 TreeInfo treeinfo;
93 Types types;
94 JCDiagnostic.Factory diags;
95 public final boolean boxingEnabled;
96 public final boolean varargsEnabled;
97 public final boolean allowMethodHandles;
98 public final boolean allowStructuralMostSpecific;
99 private final boolean debugResolve;
100 private final boolean compactMethodDiags;
101 final EnumSet<VerboseResolutionMode> verboseResolutionMode;
103 Scope polymorphicSignatureScope;
105 protected Resolve(Context context) {
106 context.put(resolveKey, this);
107 syms = Symtab.instance(context);
109 varNotFound = new
110 SymbolNotFoundError(ABSENT_VAR);
111 methodNotFound = new
112 SymbolNotFoundError(ABSENT_MTH);
113 methodWithCorrectStaticnessNotFound = new
114 SymbolNotFoundError(WRONG_STATICNESS,
115 "method found has incorrect staticness");
116 typeNotFound = new
117 SymbolNotFoundError(ABSENT_TYP);
119 names = Names.instance(context);
120 log = Log.instance(context);
121 attr = Attr.instance(context);
122 deferredAttr = DeferredAttr.instance(context);
123 chk = Check.instance(context);
124 infer = Infer.instance(context);
125 reader = ClassReader.instance(context);
126 treeinfo = TreeInfo.instance(context);
127 types = Types.instance(context);
128 diags = JCDiagnostic.Factory.instance(context);
129 Source source = Source.instance(context);
130 boxingEnabled = source.allowBoxing();
131 varargsEnabled = source.allowVarargs();
132 Options options = Options.instance(context);
133 debugResolve = options.isSet("debugresolve");
134 compactMethodDiags = options.isSet(Option.XDIAGS, "compact") ||
135 options.isUnset(Option.XDIAGS) && options.isUnset("rawDiagnostics");
136 verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
137 Target target = Target.instance(context);
138 allowMethodHandles = target.hasMethodHandles();
139 allowStructuralMostSpecific = source.allowStructuralMostSpecific();
140 polymorphicSignatureScope = new Scope(syms.noSymbol);
142 inapplicableMethodException = new InapplicableMethodException(diags);
143 }
145 /** error symbols, which are returned when resolution fails
146 */
147 private final SymbolNotFoundError varNotFound;
148 private final SymbolNotFoundError methodNotFound;
149 private final SymbolNotFoundError methodWithCorrectStaticnessNotFound;
150 private final SymbolNotFoundError typeNotFound;
152 public static Resolve instance(Context context) {
153 Resolve instance = context.get(resolveKey);
154 if (instance == null)
155 instance = new Resolve(context);
156 return instance;
157 }
159 // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
160 enum VerboseResolutionMode {
161 SUCCESS("success"),
162 FAILURE("failure"),
163 APPLICABLE("applicable"),
164 INAPPLICABLE("inapplicable"),
165 DEFERRED_INST("deferred-inference"),
166 PREDEF("predef"),
167 OBJECT_INIT("object-init"),
168 INTERNAL("internal");
170 final String opt;
172 private VerboseResolutionMode(String opt) {
173 this.opt = opt;
174 }
176 static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
177 String s = opts.get("verboseResolution");
178 EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
179 if (s == null) return res;
180 if (s.contains("all")) {
181 res = EnumSet.allOf(VerboseResolutionMode.class);
182 }
183 Collection<String> args = Arrays.asList(s.split(","));
184 for (VerboseResolutionMode mode : values()) {
185 if (args.contains(mode.opt)) {
186 res.add(mode);
187 } else if (args.contains("-" + mode.opt)) {
188 res.remove(mode);
189 }
190 }
191 return res;
192 }
193 }
195 void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
196 List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
197 boolean success = bestSoFar.kind < ERRONEOUS;
199 if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
200 return;
201 } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
202 return;
203 }
205 if (bestSoFar.name == names.init &&
206 bestSoFar.owner == syms.objectType.tsym &&
207 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
208 return; //skip diags for Object constructor resolution
209 } else if (site == syms.predefClass.type &&
210 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
211 return; //skip spurious diags for predef symbols (i.e. operators)
212 } else if (currentResolutionContext.internalResolution &&
213 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
214 return;
215 }
217 int pos = 0;
218 int mostSpecificPos = -1;
219 ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
220 for (Candidate c : currentResolutionContext.candidates) {
221 if (currentResolutionContext.step != c.step ||
222 (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
223 (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
224 continue;
225 } else {
226 subDiags.append(c.isApplicable() ?
227 getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
228 getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
229 if (c.sym == bestSoFar)
230 mostSpecificPos = pos;
231 pos++;
232 }
233 }
234 String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
235 List<Type> argtypes2 = Type.map(argtypes,
236 deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
237 JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
238 site.tsym, mostSpecificPos, currentResolutionContext.step,
239 methodArguments(argtypes2),
240 methodArguments(typeargtypes));
241 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
242 log.report(d);
243 }
245 JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
246 JCDiagnostic subDiag = null;
247 if (sym.type.hasTag(FORALL)) {
248 subDiag = diags.fragment("partial.inst.sig", inst);
249 }
251 String key = subDiag == null ?
252 "applicable.method.found" :
253 "applicable.method.found.1";
255 return diags.fragment(key, pos, sym, subDiag);
256 }
258 JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
259 return diags.fragment("not.applicable.method.found", pos, sym, subDiag);
260 }
261 // </editor-fold>
263 /* ************************************************************************
264 * Identifier resolution
265 *************************************************************************/
267 /** An environment is "static" if its static level is greater than
268 * the one of its outer environment
269 */
270 protected static boolean isStatic(Env<AttrContext> env) {
271 return env.info.staticLevel > env.outer.info.staticLevel;
272 }
274 /** An environment is an "initializer" if it is a constructor or
275 * an instance initializer.
276 */
277 static boolean isInitializer(Env<AttrContext> env) {
278 Symbol owner = env.info.scope.owner;
279 return owner.isConstructor() ||
280 owner.owner.kind == TYP &&
281 (owner.kind == VAR ||
282 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
283 (owner.flags() & STATIC) == 0;
284 }
286 /** Is class accessible in given evironment?
287 * @param env The current environment.
288 * @param c The class whose accessibility is checked.
289 */
290 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
291 return isAccessible(env, c, false);
292 }
294 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
295 boolean isAccessible = false;
296 switch ((short)(c.flags() & AccessFlags)) {
297 case PRIVATE:
298 isAccessible =
299 env.enclClass.sym.outermostClass() ==
300 c.owner.outermostClass();
301 break;
302 case 0:
303 isAccessible =
304 env.toplevel.packge == c.owner // fast special case
305 ||
306 env.toplevel.packge == c.packge()
307 ||
308 // Hack: this case is added since synthesized default constructors
309 // of anonymous classes should be allowed to access
310 // classes which would be inaccessible otherwise.
311 env.enclMethod != null &&
312 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
313 break;
314 default: // error recovery
315 case PUBLIC:
316 isAccessible = true;
317 break;
318 case PROTECTED:
319 isAccessible =
320 env.toplevel.packge == c.owner // fast special case
321 ||
322 env.toplevel.packge == c.packge()
323 ||
324 isInnerSubClass(env.enclClass.sym, c.owner);
325 break;
326 }
327 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
328 isAccessible :
329 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
330 }
331 //where
332 /** Is given class a subclass of given base class, or an inner class
333 * of a subclass?
334 * Return null if no such class exists.
335 * @param c The class which is the subclass or is contained in it.
336 * @param base The base class
337 */
338 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
339 while (c != null && !c.isSubClass(base, types)) {
340 c = c.owner.enclClass();
341 }
342 return c != null;
343 }
345 boolean isAccessible(Env<AttrContext> env, Type t) {
346 return isAccessible(env, t, false);
347 }
349 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
350 return (t.hasTag(ARRAY))
351 ? isAccessible(env, types.upperBound(types.elemtype(t)))
352 : isAccessible(env, t.tsym, checkInner);
353 }
355 /** Is symbol accessible as a member of given type in given environment?
356 * @param env The current environment.
357 * @param site The type of which the tested symbol is regarded
358 * as a member.
359 * @param sym The symbol.
360 */
361 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
362 return isAccessible(env, site, sym, false);
363 }
364 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
365 if (sym.name == names.init && sym.owner != site.tsym) return false;
366 switch ((short)(sym.flags() & AccessFlags)) {
367 case PRIVATE:
368 return
369 (env.enclClass.sym == sym.owner // fast special case
370 ||
371 env.enclClass.sym.outermostClass() ==
372 sym.owner.outermostClass())
373 &&
374 sym.isInheritedIn(site.tsym, types);
375 case 0:
376 return
377 (env.toplevel.packge == sym.owner.owner // fast special case
378 ||
379 env.toplevel.packge == sym.packge())
380 &&
381 isAccessible(env, site, checkInner)
382 &&
383 sym.isInheritedIn(site.tsym, types)
384 &&
385 notOverriddenIn(site, sym);
386 case PROTECTED:
387 return
388 (env.toplevel.packge == sym.owner.owner // fast special case
389 ||
390 env.toplevel.packge == sym.packge()
391 ||
392 isProtectedAccessible(sym, env.enclClass.sym, site)
393 ||
394 // OK to select instance method or field from 'super' or type name
395 // (but type names should be disallowed elsewhere!)
396 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
397 &&
398 isAccessible(env, site, checkInner)
399 &&
400 notOverriddenIn(site, sym);
401 default: // this case includes erroneous combinations as well
402 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
403 }
404 }
405 //where
406 /* `sym' is accessible only if not overridden by
407 * another symbol which is a member of `site'
408 * (because, if it is overridden, `sym' is not strictly
409 * speaking a member of `site'). A polymorphic signature method
410 * cannot be overridden (e.g. MH.invokeExact(Object[])).
411 */
412 private boolean notOverriddenIn(Type site, Symbol sym) {
413 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
414 return true;
415 else {
416 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
417 return (s2 == null || s2 == sym || sym.owner == s2.owner ||
418 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
419 }
420 }
421 //where
422 /** Is given protected symbol accessible if it is selected from given site
423 * and the selection takes place in given class?
424 * @param sym The symbol with protected access
425 * @param c The class where the access takes place
426 * @site The type of the qualifier
427 */
428 private
429 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
430 Type newSite = site.hasTag(TYPEVAR) ? site.getUpperBound() : site;
431 while (c != null &&
432 !(c.isSubClass(sym.owner, types) &&
433 (c.flags() & INTERFACE) == 0 &&
434 // In JLS 2e 6.6.2.1, the subclass restriction applies
435 // only to instance fields and methods -- types are excluded
436 // regardless of whether they are declared 'static' or not.
437 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || newSite.tsym.isSubClass(c, types))))
438 c = c.owner.enclClass();
439 return c != null;
440 }
442 /**
443 * Performs a recursive scan of a type looking for accessibility problems
444 * from current attribution environment
445 */
446 void checkAccessibleType(Env<AttrContext> env, Type t) {
447 accessibilityChecker.visit(t, env);
448 }
450 /**
451 * Accessibility type-visitor
452 */
453 Types.SimpleVisitor<Void, Env<AttrContext>> accessibilityChecker =
454 new Types.SimpleVisitor<Void, Env<AttrContext>>() {
456 void visit(List<Type> ts, Env<AttrContext> env) {
457 for (Type t : ts) {
458 visit(t, env);
459 }
460 }
462 public Void visitType(Type t, Env<AttrContext> env) {
463 return null;
464 }
466 @Override
467 public Void visitArrayType(ArrayType t, Env<AttrContext> env) {
468 visit(t.elemtype, env);
469 return null;
470 }
472 @Override
473 public Void visitClassType(ClassType t, Env<AttrContext> env) {
474 visit(t.getTypeArguments(), env);
475 if (!isAccessible(env, t, true)) {
476 accessBase(new AccessError(t.tsym), env.tree.pos(), env.enclClass.sym, t, t.tsym.name, true);
477 }
478 return null;
479 }
481 @Override
482 public Void visitWildcardType(WildcardType t, Env<AttrContext> env) {
483 visit(t.type, env);
484 return null;
485 }
487 @Override
488 public Void visitMethodType(MethodType t, Env<AttrContext> env) {
489 visit(t.getParameterTypes(), env);
490 visit(t.getReturnType(), env);
491 visit(t.getThrownTypes(), env);
492 return null;
493 }
494 };
496 /** Try to instantiate the type of a method so that it fits
497 * given type arguments and argument types. If successful, return
498 * the method's instantiated type, else return null.
499 * The instantiation will take into account an additional leading
500 * formal parameter if the method is an instance method seen as a member
501 * of an under determined site. In this case, we treat site as an additional
502 * parameter and the parameters of the class containing the method as
503 * additional type variables that get instantiated.
504 *
505 * @param env The current environment
506 * @param site The type of which the method is a member.
507 * @param m The method symbol.
508 * @param argtypes The invocation's given value arguments.
509 * @param typeargtypes The invocation's given type arguments.
510 * @param allowBoxing Allow boxing conversions of arguments.
511 * @param useVarargs Box trailing arguments into an array for varargs.
512 */
513 Type rawInstantiate(Env<AttrContext> env,
514 Type site,
515 Symbol m,
516 ResultInfo resultInfo,
517 List<Type> argtypes,
518 List<Type> typeargtypes,
519 boolean allowBoxing,
520 boolean useVarargs,
521 Warner warn) throws Infer.InferenceException {
523 Type mt = types.memberType(site, m);
524 // tvars is the list of formal type variables for which type arguments
525 // need to inferred.
526 List<Type> tvars = List.nil();
527 if (typeargtypes == null) typeargtypes = List.nil();
528 if (!mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
529 // This is not a polymorphic method, but typeargs are supplied
530 // which is fine, see JLS 15.12.2.1
531 } else if (mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
532 ForAll pmt = (ForAll) mt;
533 if (typeargtypes.length() != pmt.tvars.length())
534 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
535 // Check type arguments are within bounds
536 List<Type> formals = pmt.tvars;
537 List<Type> actuals = typeargtypes;
538 while (formals.nonEmpty() && actuals.nonEmpty()) {
539 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
540 pmt.tvars, typeargtypes);
541 for (; bounds.nonEmpty(); bounds = bounds.tail)
542 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
543 throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
544 formals = formals.tail;
545 actuals = actuals.tail;
546 }
547 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
548 } else if (mt.hasTag(FORALL)) {
549 ForAll pmt = (ForAll) mt;
550 List<Type> tvars1 = types.newInstances(pmt.tvars);
551 tvars = tvars.appendList(tvars1);
552 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
553 }
555 // find out whether we need to go the slow route via infer
556 boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
557 for (List<Type> l = argtypes;
558 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
559 l = l.tail) {
560 if (l.head.hasTag(FORALL)) instNeeded = true;
561 }
563 if (instNeeded)
564 return infer.instantiateMethod(env,
565 tvars,
566 (MethodType)mt,
567 resultInfo,
568 (MethodSymbol)m,
569 argtypes,
570 allowBoxing,
571 useVarargs,
572 currentResolutionContext,
573 warn);
575 DeferredAttr.DeferredAttrContext dc = currentResolutionContext.deferredAttrContext(m, infer.emptyContext, resultInfo, warn);
576 currentResolutionContext.methodCheck.argumentsAcceptable(env, dc,
577 argtypes, mt.getParameterTypes(), warn);
578 dc.complete();
579 return mt;
580 }
582 Type checkMethod(Env<AttrContext> env,
583 Type site,
584 Symbol m,
585 ResultInfo resultInfo,
586 List<Type> argtypes,
587 List<Type> typeargtypes,
588 Warner warn) {
589 MethodResolutionContext prevContext = currentResolutionContext;
590 try {
591 currentResolutionContext = new MethodResolutionContext();
592 currentResolutionContext.attrMode = DeferredAttr.AttrMode.CHECK;
593 if (env.tree.hasTag(JCTree.Tag.REFERENCE)) {
594 //method/constructor references need special check class
595 //to handle inference variables in 'argtypes' (might happen
596 //during an unsticking round)
597 currentResolutionContext.methodCheck =
598 new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
599 }
600 MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
601 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
602 step.isBoxingRequired(), step.isVarargsRequired(), warn);
603 }
604 finally {
605 currentResolutionContext = prevContext;
606 }
607 }
609 /** Same but returns null instead throwing a NoInstanceException
610 */
611 Type instantiate(Env<AttrContext> env,
612 Type site,
613 Symbol m,
614 ResultInfo resultInfo,
615 List<Type> argtypes,
616 List<Type> typeargtypes,
617 boolean allowBoxing,
618 boolean useVarargs,
619 Warner warn) {
620 try {
621 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
622 allowBoxing, useVarargs, warn);
623 } catch (InapplicableMethodException ex) {
624 return null;
625 }
626 }
628 /**
629 * This interface defines an entry point that should be used to perform a
630 * method check. A method check usually consist in determining as to whether
631 * a set of types (actuals) is compatible with another set of types (formals).
632 * Since the notion of compatibility can vary depending on the circumstances,
633 * this interfaces allows to easily add new pluggable method check routines.
634 */
635 interface MethodCheck {
636 /**
637 * Main method check routine. A method check usually consist in determining
638 * as to whether a set of types (actuals) is compatible with another set of
639 * types (formals). If an incompatibility is found, an unchecked exception
640 * is assumed to be thrown.
641 */
642 void argumentsAcceptable(Env<AttrContext> env,
643 DeferredAttrContext deferredAttrContext,
644 List<Type> argtypes,
645 List<Type> formals,
646 Warner warn);
648 /**
649 * Retrieve the method check object that will be used during a
650 * most specific check.
651 */
652 MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict);
653 }
655 /**
656 * Helper enum defining all method check diagnostics (used by resolveMethodCheck).
657 */
658 enum MethodCheckDiag {
659 /**
660 * Actuals and formals differs in length.
661 */
662 ARITY_MISMATCH("arg.length.mismatch", "infer.arg.length.mismatch"),
663 /**
664 * An actual is incompatible with a formal.
665 */
666 ARG_MISMATCH("no.conforming.assignment.exists", "infer.no.conforming.assignment.exists"),
667 /**
668 * An actual is incompatible with the varargs element type.
669 */
670 VARARG_MISMATCH("varargs.argument.mismatch", "infer.varargs.argument.mismatch"),
671 /**
672 * The varargs element type is inaccessible.
673 */
674 INACCESSIBLE_VARARGS("inaccessible.varargs.type", "inaccessible.varargs.type");
676 final String basicKey;
677 final String inferKey;
679 MethodCheckDiag(String basicKey, String inferKey) {
680 this.basicKey = basicKey;
681 this.inferKey = inferKey;
682 }
684 String regex() {
685 return String.format("([a-z]*\\.)*(%s|%s)", basicKey, inferKey);
686 }
687 }
689 /**
690 * Dummy method check object. All methods are deemed applicable, regardless
691 * of their formal parameter types.
692 */
693 MethodCheck nilMethodCheck = new MethodCheck() {
694 public void argumentsAcceptable(Env<AttrContext> env, DeferredAttrContext deferredAttrContext, List<Type> argtypes, List<Type> formals, Warner warn) {
695 //do nothing - method always applicable regardless of actuals
696 }
698 public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
699 return this;
700 }
701 };
703 /**
704 * Base class for 'real' method checks. The class defines the logic for
705 * iterating through formals and actuals and provides and entry point
706 * that can be used by subclasses in order to define the actual check logic.
707 */
708 abstract class AbstractMethodCheck implements MethodCheck {
709 @Override
710 public void argumentsAcceptable(final Env<AttrContext> env,
711 DeferredAttrContext deferredAttrContext,
712 List<Type> argtypes,
713 List<Type> formals,
714 Warner warn) {
715 //should we expand formals?
716 boolean useVarargs = deferredAttrContext.phase.isVarargsRequired();
717 List<JCExpression> trees = TreeInfo.args(env.tree);
719 //inference context used during this method check
720 InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
722 Type varargsFormal = useVarargs ? formals.last() : null;
724 if (varargsFormal == null &&
725 argtypes.size() != formals.size()) {
726 reportMC(env.tree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
727 }
729 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
730 DiagnosticPosition pos = trees != null ? trees.head : null;
731 checkArg(pos, false, argtypes.head, formals.head, deferredAttrContext, warn);
732 argtypes = argtypes.tail;
733 formals = formals.tail;
734 trees = trees != null ? trees.tail : trees;
735 }
737 if (formals.head != varargsFormal) {
738 reportMC(env.tree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
739 }
741 if (useVarargs) {
742 //note: if applicability check is triggered by most specific test,
743 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
744 final Type elt = types.elemtype(varargsFormal);
745 while (argtypes.nonEmpty()) {
746 DiagnosticPosition pos = trees != null ? trees.head : null;
747 checkArg(pos, true, argtypes.head, elt, deferredAttrContext, warn);
748 argtypes = argtypes.tail;
749 trees = trees != null ? trees.tail : trees;
750 }
751 }
752 }
754 /**
755 * Does the actual argument conforms to the corresponding formal?
756 */
757 abstract void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn);
759 protected void reportMC(DiagnosticPosition pos, MethodCheckDiag diag, InferenceContext inferenceContext, Object... args) {
760 boolean inferDiag = inferenceContext != infer.emptyContext;
761 InapplicableMethodException ex = inferDiag ?
762 infer.inferenceException : inapplicableMethodException;
763 if (inferDiag && (!diag.inferKey.equals(diag.basicKey))) {
764 Object[] args2 = new Object[args.length + 1];
765 System.arraycopy(args, 0, args2, 1, args.length);
766 args2[0] = inferenceContext.inferenceVars();
767 args = args2;
768 }
769 String key = inferDiag ? diag.inferKey : diag.basicKey;
770 throw ex.setMessage(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args));
771 }
773 public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
774 return nilMethodCheck;
775 }
777 }
779 /**
780 * Arity-based method check. A method is applicable if the number of actuals
781 * supplied conforms to the method signature.
782 */
783 MethodCheck arityMethodCheck = new AbstractMethodCheck() {
784 @Override
785 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
786 //do nothing - actual always compatible to formals
787 }
789 @Override
790 public String toString() {
791 return "arityMethodCheck";
792 }
793 };
795 List<Type> dummyArgs(int length) {
796 ListBuffer<Type> buf = new ListBuffer<>();
797 for (int i = 0 ; i < length ; i++) {
798 buf.append(Type.noType);
799 }
800 return buf.toList();
801 }
803 /**
804 * Main method applicability routine. Given a list of actual types A,
805 * a list of formal types F, determines whether the types in A are
806 * compatible (by method invocation conversion) with the types in F.
807 *
808 * Since this routine is shared between overload resolution and method
809 * type-inference, a (possibly empty) inference context is used to convert
810 * formal types to the corresponding 'undet' form ahead of a compatibility
811 * check so that constraints can be propagated and collected.
812 *
813 * Moreover, if one or more types in A is a deferred type, this routine uses
814 * DeferredAttr in order to perform deferred attribution. If one or more actual
815 * deferred types are stuck, they are placed in a queue and revisited later
816 * after the remainder of the arguments have been seen. If this is not sufficient
817 * to 'unstuck' the argument, a cyclic inference error is called out.
818 *
819 * A method check handler (see above) is used in order to report errors.
820 */
821 MethodCheck resolveMethodCheck = new AbstractMethodCheck() {
823 @Override
824 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
825 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
826 mresult.check(pos, actual);
827 }
829 @Override
830 public void argumentsAcceptable(final Env<AttrContext> env,
831 DeferredAttrContext deferredAttrContext,
832 List<Type> argtypes,
833 List<Type> formals,
834 Warner warn) {
835 super.argumentsAcceptable(env, deferredAttrContext, argtypes, formals, warn);
836 //should we expand formals?
837 if (deferredAttrContext.phase.isVarargsRequired()) {
838 //check varargs element type accessibility
839 varargsAccessible(env, types.elemtype(formals.last()),
840 deferredAttrContext.inferenceContext);
841 }
842 }
844 private void varargsAccessible(final Env<AttrContext> env, final Type t, final InferenceContext inferenceContext) {
845 if (inferenceContext.free(t)) {
846 inferenceContext.addFreeTypeListener(List.of(t), new FreeTypeListener() {
847 @Override
848 public void typesInferred(InferenceContext inferenceContext) {
849 varargsAccessible(env, inferenceContext.asInstType(t), inferenceContext);
850 }
851 });
852 } else {
853 if (!isAccessible(env, t)) {
854 Symbol location = env.enclClass.sym;
855 reportMC(env.tree, MethodCheckDiag.INACCESSIBLE_VARARGS, inferenceContext, t, Kinds.kindName(location), location);
856 }
857 }
858 }
860 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
861 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
862 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
863 MethodCheckDiag methodDiag = varargsCheck ?
864 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
866 @Override
867 public void report(DiagnosticPosition pos, JCDiagnostic details) {
868 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
869 }
870 };
871 return new MethodResultInfo(to, checkContext);
872 }
874 @Override
875 public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
876 return new MostSpecificCheck(strict, actuals);
877 }
879 @Override
880 public String toString() {
881 return "resolveMethodCheck";
882 }
883 };
885 /**
886 * This class handles method reference applicability checks; since during
887 * these checks it's sometime possible to have inference variables on
888 * the actual argument types list, the method applicability check must be
889 * extended so that inference variables are 'opened' as needed.
890 */
891 class MethodReferenceCheck extends AbstractMethodCheck {
893 InferenceContext pendingInferenceContext;
895 MethodReferenceCheck(InferenceContext pendingInferenceContext) {
896 this.pendingInferenceContext = pendingInferenceContext;
897 }
899 @Override
900 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
901 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
902 mresult.check(pos, actual);
903 }
905 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
906 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
907 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
908 MethodCheckDiag methodDiag = varargsCheck ?
909 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
911 @Override
912 public boolean compatible(Type found, Type req, Warner warn) {
913 found = pendingInferenceContext.asUndetVar(found);
914 if (found.hasTag(UNDETVAR) && req.isPrimitive()) {
915 req = types.boxedClass(req).type;
916 }
917 return super.compatible(found, req, warn);
918 }
920 @Override
921 public void report(DiagnosticPosition pos, JCDiagnostic details) {
922 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
923 }
924 };
925 return new MethodResultInfo(to, checkContext);
926 }
928 @Override
929 public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
930 return new MostSpecificCheck(strict, actuals);
931 }
932 };
934 /**
935 * Check context to be used during method applicability checks. A method check
936 * context might contain inference variables.
937 */
938 abstract class MethodCheckContext implements CheckContext {
940 boolean strict;
941 DeferredAttrContext deferredAttrContext;
942 Warner rsWarner;
944 public MethodCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
945 this.strict = strict;
946 this.deferredAttrContext = deferredAttrContext;
947 this.rsWarner = rsWarner;
948 }
950 public boolean compatible(Type found, Type req, Warner warn) {
951 return strict ?
952 types.isSubtypeUnchecked(found, deferredAttrContext.inferenceContext.asUndetVar(req), warn) :
953 types.isConvertible(found, deferredAttrContext.inferenceContext.asUndetVar(req), warn);
954 }
956 public void report(DiagnosticPosition pos, JCDiagnostic details) {
957 throw inapplicableMethodException.setMessage(details);
958 }
960 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
961 return rsWarner;
962 }
964 public InferenceContext inferenceContext() {
965 return deferredAttrContext.inferenceContext;
966 }
968 public DeferredAttrContext deferredAttrContext() {
969 return deferredAttrContext;
970 }
972 @Override
973 public String toString() {
974 return "MethodReferenceCheck";
975 }
977 }
979 /**
980 * ResultInfo class to be used during method applicability checks. Check
981 * for deferred types goes through special path.
982 */
983 class MethodResultInfo extends ResultInfo {
985 public MethodResultInfo(Type pt, CheckContext checkContext) {
986 attr.super(VAL, pt, checkContext);
987 }
989 @Override
990 protected Type check(DiagnosticPosition pos, Type found) {
991 if (found.hasTag(DEFERRED)) {
992 DeferredType dt = (DeferredType)found;
993 return dt.check(this);
994 } else {
995 Type uResult = U(found.baseType());
996 Type capturedType = pos == null || pos.getTree() == null ?
997 types.capture(uResult) :
998 checkContext.inferenceContext()
999 .cachedCapture(pos.getTree(), uResult, true);
1000 return super.check(pos, chk.checkNonVoid(pos, capturedType));
1001 }
1002 }
1004 /**
1005 * javac has a long-standing 'simplification' (see 6391995):
1006 * given an actual argument type, the method check is performed
1007 * on its upper bound. This leads to inconsistencies when an
1008 * argument type is checked against itself. For example, given
1009 * a type-variable T, it is not true that {@code U(T) <: T},
1010 * so we need to guard against that.
1011 */
1012 private Type U(Type found) {
1013 return found == pt ?
1014 found : types.upperBound(found);
1015 }
1017 @Override
1018 protected MethodResultInfo dup(Type newPt) {
1019 return new MethodResultInfo(newPt, checkContext);
1020 }
1022 @Override
1023 protected ResultInfo dup(CheckContext newContext) {
1024 return new MethodResultInfo(pt, newContext);
1025 }
1026 }
1028 /**
1029 * Most specific method applicability routine. Given a list of actual types A,
1030 * a list of formal types F1, and a list of formal types F2, the routine determines
1031 * as to whether the types in F1 can be considered more specific than those in F2 w.r.t.
1032 * argument types A.
1033 */
1034 class MostSpecificCheck implements MethodCheck {
1036 boolean strict;
1037 List<Type> actuals;
1039 MostSpecificCheck(boolean strict, List<Type> actuals) {
1040 this.strict = strict;
1041 this.actuals = actuals;
1042 }
1044 @Override
1045 public void argumentsAcceptable(final Env<AttrContext> env,
1046 DeferredAttrContext deferredAttrContext,
1047 List<Type> formals1,
1048 List<Type> formals2,
1049 Warner warn) {
1050 formals2 = adjustArgs(formals2, deferredAttrContext.msym, formals1.length(), deferredAttrContext.phase.isVarargsRequired());
1051 while (formals2.nonEmpty()) {
1052 ResultInfo mresult = methodCheckResult(formals2.head, deferredAttrContext, warn, actuals.head);
1053 mresult.check(null, formals1.head);
1054 formals1 = formals1.tail;
1055 formals2 = formals2.tail;
1056 actuals = actuals.isEmpty() ? actuals : actuals.tail;
1057 }
1058 }
1060 /**
1061 * Create a method check context to be used during the most specific applicability check
1062 */
1063 ResultInfo methodCheckResult(Type to, DeferredAttr.DeferredAttrContext deferredAttrContext,
1064 Warner rsWarner, Type actual) {
1065 return attr.new ResultInfo(Kinds.VAL, to,
1066 new MostSpecificCheckContext(strict, deferredAttrContext, rsWarner, actual));
1067 }
1069 /**
1070 * Subclass of method check context class that implements most specific
1071 * method conversion. If the actual type under analysis is a deferred type
1072 * a full blown structural analysis is carried out.
1073 */
1074 class MostSpecificCheckContext extends MethodCheckContext {
1076 Type actual;
1078 public MostSpecificCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner, Type actual) {
1079 super(strict, deferredAttrContext, rsWarner);
1080 this.actual = actual;
1081 }
1083 public boolean compatible(Type found, Type req, Warner warn) {
1084 if (!allowStructuralMostSpecific || actual == null) {
1085 return super.compatible(found, req, warn);
1086 } else {
1087 switch (actual.getTag()) {
1088 case DEFERRED:
1089 DeferredType dt = (DeferredType) actual;
1090 DeferredType.SpeculativeCache.Entry e = dt.speculativeCache.get(deferredAttrContext.msym, deferredAttrContext.phase);
1091 return (e == null || e.speculativeTree == deferredAttr.stuckTree)
1092 ? super.compatible(found, req, warn) :
1093 mostSpecific(found, req, e.speculativeTree, warn);
1094 default:
1095 return standaloneMostSpecific(found, req, actual, warn);
1096 }
1097 }
1098 }
1100 private boolean mostSpecific(Type t, Type s, JCTree tree, Warner warn) {
1101 MostSpecificChecker msc = new MostSpecificChecker(t, s, warn);
1102 msc.scan(tree);
1103 return msc.result;
1104 }
1106 boolean polyMostSpecific(Type t1, Type t2, Warner warn) {
1107 return (!t1.isPrimitive() && t2.isPrimitive())
1108 ? true : super.compatible(t1, t2, warn);
1109 }
1111 boolean standaloneMostSpecific(Type t1, Type t2, Type exprType, Warner warn) {
1112 return (exprType.isPrimitive() == t1.isPrimitive()
1113 && exprType.isPrimitive() != t2.isPrimitive())
1114 ? true : super.compatible(t1, t2, warn);
1115 }
1117 /**
1118 * Structural checker for most specific.
1119 */
1120 class MostSpecificChecker extends DeferredAttr.PolyScanner {
1122 final Type t;
1123 final Type s;
1124 final Warner warn;
1125 boolean result;
1127 MostSpecificChecker(Type t, Type s, Warner warn) {
1128 this.t = t;
1129 this.s = s;
1130 this.warn = warn;
1131 result = true;
1132 }
1134 @Override
1135 void skip(JCTree tree) {
1136 result &= standaloneMostSpecific(t, s, tree.type, warn);
1137 }
1139 @Override
1140 public void visitConditional(JCConditional tree) {
1141 if (tree.polyKind == PolyKind.STANDALONE) {
1142 result &= standaloneMostSpecific(t, s, tree.type, warn);
1143 } else {
1144 super.visitConditional(tree);
1145 }
1146 }
1148 @Override
1149 public void visitApply(JCMethodInvocation tree) {
1150 result &= (tree.polyKind == PolyKind.STANDALONE)
1151 ? standaloneMostSpecific(t, s, tree.type, warn)
1152 : polyMostSpecific(t, s, warn);
1153 }
1155 @Override
1156 public void visitNewClass(JCNewClass tree) {
1157 result &= (tree.polyKind == PolyKind.STANDALONE)
1158 ? standaloneMostSpecific(t, s, tree.type, warn)
1159 : polyMostSpecific(t, s, warn);
1160 }
1162 @Override
1163 public void visitReference(JCMemberReference tree) {
1164 if (types.isFunctionalInterface(t.tsym) &&
1165 types.isFunctionalInterface(s.tsym)) {
1166 Type desc_t = types.findDescriptorType(t);
1167 Type desc_s = types.findDescriptorType(s);
1168 if (types.isSameTypes(desc_t.getParameterTypes(),
1169 inferenceContext().asUndetVars(desc_s.getParameterTypes()))) {
1170 if (types.asSuper(t, s.tsym) != null ||
1171 types.asSuper(s, t.tsym) != null) {
1172 result &= MostSpecificCheckContext.super.compatible(t, s, warn);
1173 } else if (!desc_s.getReturnType().hasTag(VOID)) {
1174 //perform structural comparison
1175 Type ret_t = desc_t.getReturnType();
1176 Type ret_s = desc_s.getReturnType();
1177 result &= ((tree.refPolyKind == PolyKind.STANDALONE)
1178 ? standaloneMostSpecific(ret_t, ret_s, tree.sym.type.getReturnType(), warn)
1179 : polyMostSpecific(ret_t, ret_s, warn));
1180 } else {
1181 return;
1182 }
1183 }
1184 } else {
1185 result &= false;
1186 }
1187 }
1189 @Override
1190 public void visitLambda(JCLambda tree) {
1191 if (types.isFunctionalInterface(t.tsym) &&
1192 types.isFunctionalInterface(s.tsym)) {
1193 Type desc_t = types.findDescriptorType(t);
1194 Type desc_s = types.findDescriptorType(s);
1195 if (types.isSameTypes(desc_t.getParameterTypes(),
1196 inferenceContext().asUndetVars(desc_s.getParameterTypes()))) {
1197 if (types.asSuper(t, s.tsym) != null ||
1198 types.asSuper(s, t.tsym) != null) {
1199 result &= MostSpecificCheckContext.super.compatible(t, s, warn);
1200 } else if (!desc_s.getReturnType().hasTag(VOID)) {
1201 //perform structural comparison
1202 Type ret_t = desc_t.getReturnType();
1203 Type ret_s = desc_s.getReturnType();
1204 scanLambdaBody(tree, ret_t, ret_s);
1205 } else {
1206 return;
1207 }
1208 }
1209 } else {
1210 result &= false;
1211 }
1212 }
1213 //where
1215 void scanLambdaBody(JCLambda lambda, final Type t, final Type s) {
1216 if (lambda.getBodyKind() == JCTree.JCLambda.BodyKind.EXPRESSION) {
1217 result &= MostSpecificCheckContext.this.mostSpecific(t, s, lambda.body, warn);
1218 } else {
1219 DeferredAttr.LambdaReturnScanner lambdaScanner =
1220 new DeferredAttr.LambdaReturnScanner() {
1221 @Override
1222 public void visitReturn(JCReturn tree) {
1223 if (tree.expr != null) {
1224 result &= MostSpecificCheckContext.this.mostSpecific(t, s, tree.expr, warn);
1225 }
1226 }
1227 };
1228 lambdaScanner.scan(lambda.body);
1229 }
1230 }
1231 }
1232 }
1234 public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
1235 Assert.error("Cannot get here!");
1236 return null;
1237 }
1238 }
1240 public static class InapplicableMethodException extends RuntimeException {
1241 private static final long serialVersionUID = 0;
1243 JCDiagnostic diagnostic;
1244 JCDiagnostic.Factory diags;
1246 InapplicableMethodException(JCDiagnostic.Factory diags) {
1247 this.diagnostic = null;
1248 this.diags = diags;
1249 }
1250 InapplicableMethodException setMessage() {
1251 return setMessage((JCDiagnostic)null);
1252 }
1253 InapplicableMethodException setMessage(String key) {
1254 return setMessage(key != null ? diags.fragment(key) : null);
1255 }
1256 InapplicableMethodException setMessage(String key, Object... args) {
1257 return setMessage(key != null ? diags.fragment(key, args) : null);
1258 }
1259 InapplicableMethodException setMessage(JCDiagnostic diag) {
1260 this.diagnostic = diag;
1261 return this;
1262 }
1264 public JCDiagnostic getDiagnostic() {
1265 return diagnostic;
1266 }
1267 }
1268 private final InapplicableMethodException inapplicableMethodException;
1270 /* ***************************************************************************
1271 * Symbol lookup
1272 * the following naming conventions for arguments are used
1273 *
1274 * env is the environment where the symbol was mentioned
1275 * site is the type of which the symbol is a member
1276 * name is the symbol's name
1277 * if no arguments are given
1278 * argtypes are the value arguments, if we search for a method
1279 *
1280 * If no symbol was found, a ResolveError detailing the problem is returned.
1281 ****************************************************************************/
1283 /** Find field. Synthetic fields are always skipped.
1284 * @param env The current environment.
1285 * @param site The original type from where the selection takes place.
1286 * @param name The name of the field.
1287 * @param c The class to search for the field. This is always
1288 * a superclass or implemented interface of site's class.
1289 */
1290 Symbol findField(Env<AttrContext> env,
1291 Type site,
1292 Name name,
1293 TypeSymbol c) {
1294 while (c.type.hasTag(TYPEVAR))
1295 c = c.type.getUpperBound().tsym;
1296 Symbol bestSoFar = varNotFound;
1297 Symbol sym;
1298 Scope.Entry e = c.members().lookup(name);
1299 while (e.scope != null) {
1300 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
1301 return isAccessible(env, site, e.sym)
1302 ? e.sym : new AccessError(env, site, e.sym);
1303 }
1304 e = e.next();
1305 }
1306 Type st = types.supertype(c.type);
1307 if (st != null && (st.hasTag(CLASS) || st.hasTag(TYPEVAR))) {
1308 sym = findField(env, site, name, st.tsym);
1309 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1310 }
1311 for (List<Type> l = types.interfaces(c.type);
1312 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1313 l = l.tail) {
1314 sym = findField(env, site, name, l.head.tsym);
1315 if (bestSoFar.exists() && sym.exists() &&
1316 sym.owner != bestSoFar.owner)
1317 bestSoFar = new AmbiguityError(bestSoFar, sym);
1318 else if (sym.kind < bestSoFar.kind)
1319 bestSoFar = sym;
1320 }
1321 return bestSoFar;
1322 }
1324 /** Resolve a field identifier, throw a fatal error if not found.
1325 * @param pos The position to use for error reporting.
1326 * @param env The environment current at the method invocation.
1327 * @param site The type of the qualifying expression, in which
1328 * identifier is searched.
1329 * @param name The identifier's name.
1330 */
1331 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
1332 Type site, Name name) {
1333 Symbol sym = findField(env, site, name, site.tsym);
1334 if (sym.kind == VAR) return (VarSymbol)sym;
1335 else throw new FatalError(
1336 diags.fragment("fatal.err.cant.locate.field",
1337 name));
1338 }
1340 /** Find unqualified variable or field with given name.
1341 * Synthetic fields always skipped.
1342 * @param env The current environment.
1343 * @param name The name of the variable or field.
1344 */
1345 Symbol findVar(Env<AttrContext> env, Name name) {
1346 Symbol bestSoFar = varNotFound;
1347 Symbol sym;
1348 Env<AttrContext> env1 = env;
1349 boolean staticOnly = false;
1350 while (env1.outer != null) {
1351 if (isStatic(env1)) staticOnly = true;
1352 Scope.Entry e = env1.info.scope.lookup(name);
1353 while (e.scope != null &&
1354 (e.sym.kind != VAR ||
1355 (e.sym.flags_field & SYNTHETIC) != 0))
1356 e = e.next();
1357 sym = (e.scope != null)
1358 ? e.sym
1359 : findField(
1360 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
1361 if (sym.exists()) {
1362 if (staticOnly &&
1363 sym.kind == VAR &&
1364 sym.owner.kind == TYP &&
1365 (sym.flags() & STATIC) == 0)
1366 return new StaticError(sym);
1367 else
1368 return sym;
1369 } else if (sym.kind < bestSoFar.kind) {
1370 bestSoFar = sym;
1371 }
1373 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1374 env1 = env1.outer;
1375 }
1377 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
1378 if (sym.exists())
1379 return sym;
1380 if (bestSoFar.exists())
1381 return bestSoFar;
1383 Symbol origin = null;
1384 for (Scope sc : new Scope[] { env.toplevel.namedImportScope, env.toplevel.starImportScope }) {
1385 Scope.Entry e = sc.lookup(name);
1386 for (; e.scope != null; e = e.next()) {
1387 sym = e.sym;
1388 if (sym.kind != VAR)
1389 continue;
1390 // invariant: sym.kind == VAR
1391 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
1392 return new AmbiguityError(bestSoFar, sym);
1393 else if (bestSoFar.kind >= VAR) {
1394 origin = e.getOrigin().owner;
1395 bestSoFar = isAccessible(env, origin.type, sym)
1396 ? sym : new AccessError(env, origin.type, sym);
1397 }
1398 }
1399 if (bestSoFar.exists()) break;
1400 }
1401 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
1402 return bestSoFar.clone(origin);
1403 else
1404 return bestSoFar;
1405 }
1407 Warner noteWarner = new Warner();
1409 /** Select the best method for a call site among two choices.
1410 * @param env The current environment.
1411 * @param site The original type from where the
1412 * selection takes place.
1413 * @param argtypes The invocation's value arguments,
1414 * @param typeargtypes The invocation's type arguments,
1415 * @param sym Proposed new best match.
1416 * @param bestSoFar Previously found best match.
1417 * @param allowBoxing Allow boxing conversions of arguments.
1418 * @param useVarargs Box trailing arguments into an array for varargs.
1419 */
1420 @SuppressWarnings("fallthrough")
1421 Symbol selectBest(Env<AttrContext> env,
1422 Type site,
1423 List<Type> argtypes,
1424 List<Type> typeargtypes,
1425 Symbol sym,
1426 Symbol bestSoFar,
1427 boolean allowBoxing,
1428 boolean useVarargs,
1429 boolean operator) {
1430 if (sym.kind == ERR ||
1431 !sym.isInheritedIn(site.tsym, types)) {
1432 return bestSoFar;
1433 } else if (useVarargs && (sym.flags() & VARARGS) == 0) {
1434 return bestSoFar.kind >= ERRONEOUS ?
1435 new BadVarargsMethod((ResolveError)bestSoFar) :
1436 bestSoFar;
1437 }
1438 Assert.check(sym.kind < AMBIGUOUS);
1439 try {
1440 Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
1441 allowBoxing, useVarargs, types.noWarnings);
1442 if (!operator || verboseResolutionMode.contains(VerboseResolutionMode.PREDEF))
1443 currentResolutionContext.addApplicableCandidate(sym, mt);
1444 } catch (InapplicableMethodException ex) {
1445 if (!operator)
1446 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
1447 switch (bestSoFar.kind) {
1448 case ABSENT_MTH:
1449 return new InapplicableSymbolError(currentResolutionContext);
1450 case WRONG_MTH:
1451 if (operator) return bestSoFar;
1452 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1453 default:
1454 return bestSoFar;
1455 }
1456 }
1457 if (!isAccessible(env, site, sym)) {
1458 return (bestSoFar.kind == ABSENT_MTH)
1459 ? new AccessError(env, site, sym)
1460 : bestSoFar;
1461 }
1462 return (bestSoFar.kind > AMBIGUOUS)
1463 ? sym
1464 : mostSpecific(argtypes, sym, bestSoFar, env, site,
1465 allowBoxing && operator, useVarargs);
1466 }
1468 /* Return the most specific of the two methods for a call,
1469 * given that both are accessible and applicable.
1470 * @param m1 A new candidate for most specific.
1471 * @param m2 The previous most specific candidate.
1472 * @param env The current environment.
1473 * @param site The original type from where the selection
1474 * takes place.
1475 * @param allowBoxing Allow boxing conversions of arguments.
1476 * @param useVarargs Box trailing arguments into an array for varargs.
1477 */
1478 Symbol mostSpecific(List<Type> argtypes, Symbol m1,
1479 Symbol m2,
1480 Env<AttrContext> env,
1481 final Type site,
1482 boolean allowBoxing,
1483 boolean useVarargs) {
1484 switch (m2.kind) {
1485 case MTH:
1486 if (m1 == m2) return m1;
1487 boolean m1SignatureMoreSpecific =
1488 signatureMoreSpecific(argtypes, env, site, m1, m2, allowBoxing, useVarargs);
1489 boolean m2SignatureMoreSpecific =
1490 signatureMoreSpecific(argtypes, env, site, m2, m1, allowBoxing, useVarargs);
1491 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
1492 Type mt1 = types.memberType(site, m1);
1493 Type mt2 = types.memberType(site, m2);
1494 if (!types.overrideEquivalent(mt1, mt2))
1495 return ambiguityError(m1, m2);
1497 // same signature; select (a) the non-bridge method, or
1498 // (b) the one that overrides the other, or (c) the concrete
1499 // one, or (d) merge both abstract signatures
1500 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
1501 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
1503 // if one overrides or hides the other, use it
1504 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
1505 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
1506 if (types.asSuper(m1Owner.type, m2Owner) != null &&
1507 ((m1.owner.flags_field & INTERFACE) == 0 ||
1508 (m2.owner.flags_field & INTERFACE) != 0) &&
1509 m1.overrides(m2, m1Owner, types, false))
1510 return m1;
1511 if (types.asSuper(m2Owner.type, m1Owner) != null &&
1512 ((m2.owner.flags_field & INTERFACE) == 0 ||
1513 (m1.owner.flags_field & INTERFACE) != 0) &&
1514 m2.overrides(m1, m2Owner, types, false))
1515 return m2;
1516 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
1517 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
1518 if (m1Abstract && !m2Abstract) return m2;
1519 if (m2Abstract && !m1Abstract) return m1;
1520 // both abstract or both concrete
1521 return ambiguityError(m1, m2);
1522 }
1523 if (m1SignatureMoreSpecific) return m1;
1524 if (m2SignatureMoreSpecific) return m2;
1525 return ambiguityError(m1, m2);
1526 case AMBIGUOUS:
1527 //check if m1 is more specific than all ambiguous methods in m2
1528 AmbiguityError e = (AmbiguityError)m2.baseSymbol();
1529 for (Symbol s : e.ambiguousSyms) {
1530 if (mostSpecific(argtypes, m1, s, env, site, allowBoxing, useVarargs) != m1) {
1531 return e.addAmbiguousSymbol(m1);
1532 }
1533 }
1534 return m1;
1535 default:
1536 throw new AssertionError();
1537 }
1538 }
1539 //where
1540 private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
1541 noteWarner.clear();
1542 int maxLength = Math.max(
1543 Math.max(m1.type.getParameterTypes().length(), actuals.length()),
1544 m2.type.getParameterTypes().length());
1545 MethodResolutionContext prevResolutionContext = currentResolutionContext;
1546 try {
1547 currentResolutionContext = new MethodResolutionContext();
1548 currentResolutionContext.step = prevResolutionContext.step;
1549 currentResolutionContext.methodCheck =
1550 prevResolutionContext.methodCheck.mostSpecificCheck(actuals, !allowBoxing);
1551 Type mst = instantiate(env, site, m2, null,
1552 adjustArgs(types.lowerBounds(types.memberType(site, m1).getParameterTypes()), m1, maxLength, useVarargs), null,
1553 allowBoxing, useVarargs, noteWarner);
1554 return mst != null &&
1555 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
1556 } finally {
1557 currentResolutionContext = prevResolutionContext;
1558 }
1559 }
1561 List<Type> adjustArgs(List<Type> args, Symbol msym, int length, boolean allowVarargs) {
1562 if ((msym.flags() & VARARGS) != 0 && allowVarargs) {
1563 Type varargsElem = types.elemtype(args.last());
1564 if (varargsElem == null) {
1565 Assert.error("Bad varargs = " + args.last() + " " + msym);
1566 }
1567 List<Type> newArgs = args.reverse().tail.prepend(varargsElem).reverse();
1568 while (newArgs.length() < length) {
1569 newArgs = newArgs.append(newArgs.last());
1570 }
1571 return newArgs;
1572 } else {
1573 return args;
1574 }
1575 }
1576 //where
1577 Type mostSpecificReturnType(Type mt1, Type mt2) {
1578 Type rt1 = mt1.getReturnType();
1579 Type rt2 = mt2.getReturnType();
1581 if (mt1.hasTag(FORALL) && mt2.hasTag(FORALL)) {
1582 //if both are generic methods, adjust return type ahead of subtyping check
1583 rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
1584 }
1585 //first use subtyping, then return type substitutability
1586 if (types.isSubtype(rt1, rt2)) {
1587 return mt1;
1588 } else if (types.isSubtype(rt2, rt1)) {
1589 return mt2;
1590 } else if (types.returnTypeSubstitutable(mt1, mt2)) {
1591 return mt1;
1592 } else if (types.returnTypeSubstitutable(mt2, mt1)) {
1593 return mt2;
1594 } else {
1595 return null;
1596 }
1597 }
1598 //where
1599 Symbol ambiguityError(Symbol m1, Symbol m2) {
1600 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
1601 return (m1.flags() & CLASH) == 0 ? m1 : m2;
1602 } else {
1603 return new AmbiguityError(m1, m2);
1604 }
1605 }
1607 Symbol findMethodInScope(Env<AttrContext> env,
1608 Type site,
1609 Name name,
1610 List<Type> argtypes,
1611 List<Type> typeargtypes,
1612 Scope sc,
1613 Symbol bestSoFar,
1614 boolean allowBoxing,
1615 boolean useVarargs,
1616 boolean operator,
1617 boolean abstractok) {
1618 for (Symbol s : sc.getElementsByName(name, new LookupFilter(abstractok))) {
1619 bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
1620 bestSoFar, allowBoxing, useVarargs, operator);
1621 }
1622 return bestSoFar;
1623 }
1624 //where
1625 class LookupFilter implements Filter<Symbol> {
1627 boolean abstractOk;
1629 LookupFilter(boolean abstractOk) {
1630 this.abstractOk = abstractOk;
1631 }
1633 public boolean accepts(Symbol s) {
1634 long flags = s.flags();
1635 return s.kind == MTH &&
1636 (flags & SYNTHETIC) == 0 &&
1637 (abstractOk ||
1638 (flags & DEFAULT) != 0 ||
1639 (flags & ABSTRACT) == 0);
1640 }
1641 };
1643 /** Find best qualified method matching given name, type and value
1644 * arguments.
1645 * @param env The current environment.
1646 * @param site The original type from where the selection
1647 * takes place.
1648 * @param name The method's name.
1649 * @param argtypes The method's value arguments.
1650 * @param typeargtypes The method's type arguments
1651 * @param allowBoxing Allow boxing conversions of arguments.
1652 * @param useVarargs Box trailing arguments into an array for varargs.
1653 */
1654 Symbol findMethod(Env<AttrContext> env,
1655 Type site,
1656 Name name,
1657 List<Type> argtypes,
1658 List<Type> typeargtypes,
1659 boolean allowBoxing,
1660 boolean useVarargs,
1661 boolean operator) {
1662 Symbol bestSoFar = methodNotFound;
1663 bestSoFar = findMethod(env,
1664 site,
1665 name,
1666 argtypes,
1667 typeargtypes,
1668 site.tsym.type,
1669 bestSoFar,
1670 allowBoxing,
1671 useVarargs,
1672 operator);
1673 return bestSoFar;
1674 }
1675 // where
1676 private Symbol findMethod(Env<AttrContext> env,
1677 Type site,
1678 Name name,
1679 List<Type> argtypes,
1680 List<Type> typeargtypes,
1681 Type intype,
1682 Symbol bestSoFar,
1683 boolean allowBoxing,
1684 boolean useVarargs,
1685 boolean operator) {
1686 @SuppressWarnings({"unchecked","rawtypes"})
1687 List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
1688 InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
1689 for (TypeSymbol s : superclasses(intype)) {
1690 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1691 s.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
1692 if (name == names.init) return bestSoFar;
1693 iphase = (iphase == null) ? null : iphase.update(s, this);
1694 if (iphase != null) {
1695 for (Type itype : types.interfaces(s.type)) {
1696 itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
1697 }
1698 }
1699 }
1701 Symbol concrete = bestSoFar.kind < ERR &&
1702 (bestSoFar.flags() & ABSTRACT) == 0 ?
1703 bestSoFar : methodNotFound;
1705 for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
1706 //keep searching for abstract methods
1707 for (Type itype : itypes[iphase2.ordinal()]) {
1708 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
1709 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
1710 (itype.tsym.flags() & DEFAULT) == 0) continue;
1711 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1712 itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
1713 if (concrete != bestSoFar &&
1714 concrete.kind < ERR && bestSoFar.kind < ERR &&
1715 types.isSubSignature(concrete.type, bestSoFar.type)) {
1716 //this is an hack - as javac does not do full membership checks
1717 //most specific ends up comparing abstract methods that might have
1718 //been implemented by some concrete method in a subclass and,
1719 //because of raw override, it is possible for an abstract method
1720 //to be more specific than the concrete method - so we need
1721 //to explicitly call that out (see CR 6178365)
1722 bestSoFar = concrete;
1723 }
1724 }
1725 }
1726 return bestSoFar;
1727 }
1729 enum InterfaceLookupPhase {
1730 ABSTRACT_OK() {
1731 @Override
1732 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1733 //We should not look for abstract methods if receiver is a concrete class
1734 //(as concrete classes are expected to implement all abstracts coming
1735 //from superinterfaces)
1736 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
1737 return this;
1738 } else {
1739 return DEFAULT_OK;
1740 }
1741 }
1742 },
1743 DEFAULT_OK() {
1744 @Override
1745 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1746 return this;
1747 }
1748 };
1750 abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
1751 }
1753 /**
1754 * Return an Iterable object to scan the superclasses of a given type.
1755 * It's crucial that the scan is done lazily, as we don't want to accidentally
1756 * access more supertypes than strictly needed (as this could trigger completion
1757 * errors if some of the not-needed supertypes are missing/ill-formed).
1758 */
1759 Iterable<TypeSymbol> superclasses(final Type intype) {
1760 return new Iterable<TypeSymbol>() {
1761 public Iterator<TypeSymbol> iterator() {
1762 return new Iterator<TypeSymbol>() {
1764 List<TypeSymbol> seen = List.nil();
1765 TypeSymbol currentSym = symbolFor(intype);
1766 TypeSymbol prevSym = null;
1768 public boolean hasNext() {
1769 if (currentSym == syms.noSymbol) {
1770 currentSym = symbolFor(types.supertype(prevSym.type));
1771 }
1772 return currentSym != null;
1773 }
1775 public TypeSymbol next() {
1776 prevSym = currentSym;
1777 currentSym = syms.noSymbol;
1778 Assert.check(prevSym != null || prevSym != syms.noSymbol);
1779 return prevSym;
1780 }
1782 public void remove() {
1783 throw new UnsupportedOperationException();
1784 }
1786 TypeSymbol symbolFor(Type t) {
1787 if (!t.hasTag(CLASS) &&
1788 !t.hasTag(TYPEVAR)) {
1789 return null;
1790 }
1791 while (t.hasTag(TYPEVAR))
1792 t = t.getUpperBound();
1793 if (seen.contains(t.tsym)) {
1794 //degenerate case in which we have a circular
1795 //class hierarchy - because of ill-formed classfiles
1796 return null;
1797 }
1798 seen = seen.prepend(t.tsym);
1799 return t.tsym;
1800 }
1801 };
1802 }
1803 };
1804 }
1806 /** Find unqualified method matching given name, type and value arguments.
1807 * @param env The current environment.
1808 * @param name The method's name.
1809 * @param argtypes The method's value arguments.
1810 * @param typeargtypes The method's type arguments.
1811 * @param allowBoxing Allow boxing conversions of arguments.
1812 * @param useVarargs Box trailing arguments into an array for varargs.
1813 */
1814 Symbol findFun(Env<AttrContext> env, Name name,
1815 List<Type> argtypes, List<Type> typeargtypes,
1816 boolean allowBoxing, boolean useVarargs) {
1817 Symbol bestSoFar = methodNotFound;
1818 Symbol sym;
1819 Env<AttrContext> env1 = env;
1820 boolean staticOnly = false;
1821 while (env1.outer != null) {
1822 if (isStatic(env1)) staticOnly = true;
1823 sym = findMethod(
1824 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
1825 allowBoxing, useVarargs, false);
1826 if (sym.exists()) {
1827 if (staticOnly &&
1828 sym.kind == MTH &&
1829 sym.owner.kind == TYP &&
1830 (sym.flags() & STATIC) == 0) return new StaticError(sym);
1831 else return sym;
1832 } else if (sym.kind < bestSoFar.kind) {
1833 bestSoFar = sym;
1834 }
1835 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1836 env1 = env1.outer;
1837 }
1839 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1840 typeargtypes, allowBoxing, useVarargs, false);
1841 if (sym.exists())
1842 return sym;
1844 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
1845 for (; e.scope != null; e = e.next()) {
1846 sym = e.sym;
1847 Type origin = e.getOrigin().owner.type;
1848 if (sym.kind == MTH) {
1849 if (e.sym.owner.type != origin)
1850 sym = sym.clone(e.getOrigin().owner);
1851 if (!isAccessible(env, origin, sym))
1852 sym = new AccessError(env, origin, sym);
1853 bestSoFar = selectBest(env, origin,
1854 argtypes, typeargtypes,
1855 sym, bestSoFar,
1856 allowBoxing, useVarargs, false);
1857 }
1858 }
1859 if (bestSoFar.exists())
1860 return bestSoFar;
1862 e = env.toplevel.starImportScope.lookup(name);
1863 for (; e.scope != null; e = e.next()) {
1864 sym = e.sym;
1865 Type origin = e.getOrigin().owner.type;
1866 if (sym.kind == MTH) {
1867 if (e.sym.owner.type != origin)
1868 sym = sym.clone(e.getOrigin().owner);
1869 if (!isAccessible(env, origin, sym))
1870 sym = new AccessError(env, origin, sym);
1871 bestSoFar = selectBest(env, origin,
1872 argtypes, typeargtypes,
1873 sym, bestSoFar,
1874 allowBoxing, useVarargs, false);
1875 }
1876 }
1877 return bestSoFar;
1878 }
1880 /** Load toplevel or member class with given fully qualified name and
1881 * verify that it is accessible.
1882 * @param env The current environment.
1883 * @param name The fully qualified name of the class to be loaded.
1884 */
1885 Symbol loadClass(Env<AttrContext> env, Name name) {
1886 try {
1887 ClassSymbol c = reader.loadClass(name);
1888 return isAccessible(env, c) ? c : new AccessError(c);
1889 } catch (ClassReader.BadClassFile err) {
1890 throw err;
1891 } catch (CompletionFailure ex) {
1892 return typeNotFound;
1893 }
1894 }
1897 /**
1898 * Find a type declared in a scope (not inherited). Return null
1899 * if none is found.
1900 * @param env The current environment.
1901 * @param site The original type from where the selection takes
1902 * place.
1903 * @param name The type's name.
1904 * @param c The class to search for the member type. This is
1905 * always a superclass or implemented interface of
1906 * site's class.
1907 */
1908 Symbol findImmediateMemberType(Env<AttrContext> env,
1909 Type site,
1910 Name name,
1911 TypeSymbol c) {
1912 Scope.Entry e = c.members().lookup(name);
1913 while (e.scope != null) {
1914 if (e.sym.kind == TYP) {
1915 return isAccessible(env, site, e.sym)
1916 ? e.sym
1917 : new AccessError(env, site, e.sym);
1918 }
1919 e = e.next();
1920 }
1921 return typeNotFound;
1922 }
1924 /** Find a member type inherited from a superclass or interface.
1925 * @param env The current environment.
1926 * @param site The original type from where the selection takes
1927 * place.
1928 * @param name The type's name.
1929 * @param c The class to search for the member type. This is
1930 * always a superclass or implemented interface of
1931 * site's class.
1932 */
1933 Symbol findInheritedMemberType(Env<AttrContext> env,
1934 Type site,
1935 Name name,
1936 TypeSymbol c) {
1937 Symbol bestSoFar = typeNotFound;
1938 Symbol sym;
1939 Type st = types.supertype(c.type);
1940 if (st != null && st.hasTag(CLASS)) {
1941 sym = findMemberType(env, site, name, st.tsym);
1942 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1943 }
1944 for (List<Type> l = types.interfaces(c.type);
1945 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1946 l = l.tail) {
1947 sym = findMemberType(env, site, name, l.head.tsym);
1948 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1949 sym.owner != bestSoFar.owner)
1950 bestSoFar = new AmbiguityError(bestSoFar, sym);
1951 else if (sym.kind < bestSoFar.kind)
1952 bestSoFar = sym;
1953 }
1954 return bestSoFar;
1955 }
1957 /** Find qualified member type.
1958 * @param env The current environment.
1959 * @param site The original type from where the selection takes
1960 * place.
1961 * @param name The type's name.
1962 * @param c The class to search for the member type. This is
1963 * always a superclass or implemented interface of
1964 * site's class.
1965 */
1966 Symbol findMemberType(Env<AttrContext> env,
1967 Type site,
1968 Name name,
1969 TypeSymbol c) {
1970 Symbol sym = findImmediateMemberType(env, site, name, c);
1972 if (sym != typeNotFound)
1973 return sym;
1975 return findInheritedMemberType(env, site, name, c);
1977 }
1979 /** Find a global type in given scope and load corresponding class.
1980 * @param env The current environment.
1981 * @param scope The scope in which to look for the type.
1982 * @param name The type's name.
1983 */
1984 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1985 Symbol bestSoFar = typeNotFound;
1986 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1987 Symbol sym = loadClass(env, e.sym.flatName());
1988 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1989 bestSoFar != sym)
1990 return new AmbiguityError(bestSoFar, sym);
1991 else if (sym.kind < bestSoFar.kind)
1992 bestSoFar = sym;
1993 }
1994 return bestSoFar;
1995 }
1997 Symbol findTypeVar(Env<AttrContext> env, Name name, boolean staticOnly) {
1998 for (Scope.Entry e = env.info.scope.lookup(name);
1999 e.scope != null;
2000 e = e.next()) {
2001 if (e.sym.kind == TYP) {
2002 if (staticOnly &&
2003 e.sym.type.hasTag(TYPEVAR) &&
2004 e.sym.owner.kind == TYP)
2005 return new StaticError(e.sym);
2006 return e.sym;
2007 }
2008 }
2009 return typeNotFound;
2010 }
2012 /** Find an unqualified type symbol.
2013 * @param env The current environment.
2014 * @param name The type's name.
2015 */
2016 Symbol findType(Env<AttrContext> env, Name name) {
2017 Symbol bestSoFar = typeNotFound;
2018 Symbol sym;
2019 boolean staticOnly = false;
2020 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
2021 if (isStatic(env1)) staticOnly = true;
2022 // First, look for a type variable and the first member type
2023 final Symbol tyvar = findTypeVar(env1, name, staticOnly);
2024 sym = findImmediateMemberType(env1, env1.enclClass.sym.type,
2025 name, env1.enclClass.sym);
2027 // Return the type variable if we have it, and have no
2028 // immediate member, OR the type variable is for a method.
2029 if (tyvar != typeNotFound) {
2030 if (sym == typeNotFound ||
2031 (tyvar.kind == TYP && tyvar.exists() &&
2032 tyvar.owner.kind == MTH))
2033 return tyvar;
2034 }
2036 // If the environment is a class def, finish up,
2037 // otherwise, do the entire findMemberType
2038 if (sym == typeNotFound)
2039 sym = findInheritedMemberType(env1, env1.enclClass.sym.type,
2040 name, env1.enclClass.sym);
2042 if (staticOnly && sym.kind == TYP &&
2043 sym.type.hasTag(CLASS) &&
2044 sym.type.getEnclosingType().hasTag(CLASS) &&
2045 env1.enclClass.sym.type.isParameterized() &&
2046 sym.type.getEnclosingType().isParameterized())
2047 return new StaticError(sym);
2048 else if (sym.exists()) return sym;
2049 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2051 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
2052 if ((encl.sym.flags() & STATIC) != 0)
2053 staticOnly = true;
2054 }
2056 if (!env.tree.hasTag(IMPORT)) {
2057 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
2058 if (sym.exists()) return sym;
2059 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2061 sym = findGlobalType(env, env.toplevel.packge.members(), name);
2062 if (sym.exists()) return sym;
2063 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2065 sym = findGlobalType(env, env.toplevel.starImportScope, name);
2066 if (sym.exists()) return sym;
2067 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2068 }
2070 return bestSoFar;
2071 }
2073 /** Find an unqualified identifier which matches a specified kind set.
2074 * @param env The current environment.
2075 * @param name The identifier's name.
2076 * @param kind Indicates the possible symbol kinds
2077 * (a subset of VAL, TYP, PCK).
2078 */
2079 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
2080 Symbol bestSoFar = typeNotFound;
2081 Symbol sym;
2083 if ((kind & VAR) != 0) {
2084 sym = findVar(env, name);
2085 if (sym.exists()) return sym;
2086 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2087 }
2089 if ((kind & TYP) != 0) {
2090 sym = findType(env, name);
2091 if (sym.kind==TYP) {
2092 reportDependence(env.enclClass.sym, sym);
2093 }
2094 if (sym.exists()) return sym;
2095 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2096 }
2098 if ((kind & PCK) != 0) return reader.enterPackage(name);
2099 else return bestSoFar;
2100 }
2102 /** Report dependencies.
2103 * @param from The enclosing class sym
2104 * @param to The found identifier that the class depends on.
2105 */
2106 public void reportDependence(Symbol from, Symbol to) {
2107 // Override if you want to collect the reported dependencies.
2108 }
2110 /** Find an identifier in a package which matches a specified kind set.
2111 * @param env The current environment.
2112 * @param name The identifier's name.
2113 * @param kind Indicates the possible symbol kinds
2114 * (a nonempty subset of TYP, PCK).
2115 */
2116 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
2117 Name name, int kind) {
2118 Name fullname = TypeSymbol.formFullName(name, pck);
2119 Symbol bestSoFar = typeNotFound;
2120 PackageSymbol pack = null;
2121 if ((kind & PCK) != 0) {
2122 pack = reader.enterPackage(fullname);
2123 if (pack.exists()) return pack;
2124 }
2125 if ((kind & TYP) != 0) {
2126 Symbol sym = loadClass(env, fullname);
2127 if (sym.exists()) {
2128 // don't allow programs to use flatnames
2129 if (name == sym.name) return sym;
2130 }
2131 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2132 }
2133 return (pack != null) ? pack : bestSoFar;
2134 }
2136 /** Find an identifier among the members of a given type `site'.
2137 * @param env The current environment.
2138 * @param site The type containing the symbol to be found.
2139 * @param name The identifier's name.
2140 * @param kind Indicates the possible symbol kinds
2141 * (a subset of VAL, TYP).
2142 */
2143 Symbol findIdentInType(Env<AttrContext> env, Type site,
2144 Name name, int kind) {
2145 Symbol bestSoFar = typeNotFound;
2146 Symbol sym;
2147 if ((kind & VAR) != 0) {
2148 sym = findField(env, site, name, site.tsym);
2149 if (sym.exists()) return sym;
2150 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2151 }
2153 if ((kind & TYP) != 0) {
2154 sym = findMemberType(env, site, name, site.tsym);
2155 if (sym.exists()) return sym;
2156 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
2157 }
2158 return bestSoFar;
2159 }
2161 /* ***************************************************************************
2162 * Access checking
2163 * The following methods convert ResolveErrors to ErrorSymbols, issuing
2164 * an error message in the process
2165 ****************************************************************************/
2167 /** If `sym' is a bad symbol: report error and return errSymbol
2168 * else pass through unchanged,
2169 * additional arguments duplicate what has been used in trying to find the
2170 * symbol {@literal (--> flyweight pattern)}. This improves performance since we
2171 * expect misses to happen frequently.
2172 *
2173 * @param sym The symbol that was found, or a ResolveError.
2174 * @param pos The position to use for error reporting.
2175 * @param location The symbol the served as a context for this lookup
2176 * @param site The original type from where the selection took place.
2177 * @param name The symbol's name.
2178 * @param qualified Did we get here through a qualified expression resolution?
2179 * @param argtypes The invocation's value arguments,
2180 * if we looked for a method.
2181 * @param typeargtypes The invocation's type arguments,
2182 * if we looked for a method.
2183 * @param logResolveHelper helper class used to log resolve errors
2184 */
2185 Symbol accessInternal(Symbol sym,
2186 DiagnosticPosition pos,
2187 Symbol location,
2188 Type site,
2189 Name name,
2190 boolean qualified,
2191 List<Type> argtypes,
2192 List<Type> typeargtypes,
2193 LogResolveHelper logResolveHelper) {
2194 if (sym.kind >= AMBIGUOUS) {
2195 ResolveError errSym = (ResolveError)sym;
2196 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
2197 argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
2198 if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
2199 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
2200 }
2201 }
2202 return sym;
2203 }
2205 /**
2206 * Variant of the generalized access routine, to be used for generating method
2207 * resolution diagnostics
2208 */
2209 Symbol accessMethod(Symbol sym,
2210 DiagnosticPosition pos,
2211 Symbol location,
2212 Type site,
2213 Name name,
2214 boolean qualified,
2215 List<Type> argtypes,
2216 List<Type> typeargtypes) {
2217 return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
2218 }
2220 /** Same as original accessMethod(), but without location.
2221 */
2222 Symbol accessMethod(Symbol sym,
2223 DiagnosticPosition pos,
2224 Type site,
2225 Name name,
2226 boolean qualified,
2227 List<Type> argtypes,
2228 List<Type> typeargtypes) {
2229 return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
2230 }
2232 /**
2233 * Variant of the generalized access routine, to be used for generating variable,
2234 * type resolution diagnostics
2235 */
2236 Symbol accessBase(Symbol sym,
2237 DiagnosticPosition pos,
2238 Symbol location,
2239 Type site,
2240 Name name,
2241 boolean qualified) {
2242 return accessInternal(sym, pos, location, site, name, qualified, List.<Type>nil(), null, basicLogResolveHelper);
2243 }
2245 /** Same as original accessBase(), but without location.
2246 */
2247 Symbol accessBase(Symbol sym,
2248 DiagnosticPosition pos,
2249 Type site,
2250 Name name,
2251 boolean qualified) {
2252 return accessBase(sym, pos, site.tsym, site, name, qualified);
2253 }
2255 interface LogResolveHelper {
2256 boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
2257 List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
2258 }
2260 LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
2261 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2262 return !site.isErroneous();
2263 }
2264 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2265 return argtypes;
2266 }
2267 };
2269 LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
2270 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2271 return !site.isErroneous() &&
2272 !Type.isErroneous(argtypes) &&
2273 (typeargtypes == null || !Type.isErroneous(typeargtypes));
2274 }
2275 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2276 return (syms.operatorNames.contains(name)) ?
2277 argtypes :
2278 Type.map(argtypes, new ResolveDeferredRecoveryMap(AttrMode.SPECULATIVE, accessedSym, currentResolutionContext.step));
2279 }
2280 };
2282 class ResolveDeferredRecoveryMap extends DeferredAttr.RecoveryDeferredTypeMap {
2284 public ResolveDeferredRecoveryMap(AttrMode mode, Symbol msym, MethodResolutionPhase step) {
2285 deferredAttr.super(mode, msym, step);
2286 }
2288 @Override
2289 protected Type typeOf(DeferredType dt) {
2290 Type res = super.typeOf(dt);
2291 if (!res.isErroneous()) {
2292 switch (TreeInfo.skipParens(dt.tree).getTag()) {
2293 case LAMBDA:
2294 case REFERENCE:
2295 return dt;
2296 case CONDEXPR:
2297 return res == Type.recoveryType ?
2298 dt : res;
2299 }
2300 }
2301 return res;
2302 }
2303 }
2305 /** Check that sym is not an abstract method.
2306 */
2307 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
2308 if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
2309 log.error(pos, "abstract.cant.be.accessed.directly",
2310 kindName(sym), sym, sym.location());
2311 }
2313 /* ***************************************************************************
2314 * Debugging
2315 ****************************************************************************/
2317 /** print all scopes starting with scope s and proceeding outwards.
2318 * used for debugging.
2319 */
2320 public void printscopes(Scope s) {
2321 while (s != null) {
2322 if (s.owner != null)
2323 System.err.print(s.owner + ": ");
2324 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
2325 if ((e.sym.flags() & ABSTRACT) != 0)
2326 System.err.print("abstract ");
2327 System.err.print(e.sym + " ");
2328 }
2329 System.err.println();
2330 s = s.next;
2331 }
2332 }
2334 void printscopes(Env<AttrContext> env) {
2335 while (env.outer != null) {
2336 System.err.println("------------------------------");
2337 printscopes(env.info.scope);
2338 env = env.outer;
2339 }
2340 }
2342 public void printscopes(Type t) {
2343 while (t.hasTag(CLASS)) {
2344 printscopes(t.tsym.members());
2345 t = types.supertype(t);
2346 }
2347 }
2349 /* ***************************************************************************
2350 * Name resolution
2351 * Naming conventions are as for symbol lookup
2352 * Unlike the find... methods these methods will report access errors
2353 ****************************************************************************/
2355 /** Resolve an unqualified (non-method) identifier.
2356 * @param pos The position to use for error reporting.
2357 * @param env The environment current at the identifier use.
2358 * @param name The identifier's name.
2359 * @param kind The set of admissible symbol kinds for the identifier.
2360 */
2361 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
2362 Name name, int kind) {
2363 return accessBase(
2364 findIdent(env, name, kind),
2365 pos, env.enclClass.sym.type, name, false);
2366 }
2368 /** Resolve an unqualified method identifier.
2369 * @param pos The position to use for error reporting.
2370 * @param env The environment current at the method invocation.
2371 * @param name The identifier's name.
2372 * @param argtypes The types of the invocation's value arguments.
2373 * @param typeargtypes The types of the invocation's type arguments.
2374 */
2375 Symbol resolveMethod(DiagnosticPosition pos,
2376 Env<AttrContext> env,
2377 Name name,
2378 List<Type> argtypes,
2379 List<Type> typeargtypes) {
2380 return lookupMethod(env, pos, env.enclClass.sym, resolveMethodCheck,
2381 new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
2382 @Override
2383 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2384 return findFun(env, name, argtypes, typeargtypes,
2385 phase.isBoxingRequired(),
2386 phase.isVarargsRequired());
2387 }});
2388 }
2390 /** Resolve a qualified method identifier
2391 * @param pos The position to use for error reporting.
2392 * @param env The environment current at the method invocation.
2393 * @param site The type of the qualifying expression, in which
2394 * identifier is searched.
2395 * @param name The identifier's name.
2396 * @param argtypes The types of the invocation's value arguments.
2397 * @param typeargtypes The types of the invocation's type arguments.
2398 */
2399 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2400 Type site, Name name, List<Type> argtypes,
2401 List<Type> typeargtypes) {
2402 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
2403 }
2404 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2405 Symbol location, Type site, Name name, List<Type> argtypes,
2406 List<Type> typeargtypes) {
2407 return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
2408 }
2409 private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
2410 DiagnosticPosition pos, Env<AttrContext> env,
2411 Symbol location, Type site, Name name, List<Type> argtypes,
2412 List<Type> typeargtypes) {
2413 return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
2414 @Override
2415 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2416 return findMethod(env, site, name, argtypes, typeargtypes,
2417 phase.isBoxingRequired(),
2418 phase.isVarargsRequired(), false);
2419 }
2420 @Override
2421 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2422 if (sym.kind >= AMBIGUOUS) {
2423 sym = super.access(env, pos, location, sym);
2424 } else if (allowMethodHandles) {
2425 MethodSymbol msym = (MethodSymbol)sym;
2426 if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
2427 return findPolymorphicSignatureInstance(env, sym, argtypes);
2428 }
2429 }
2430 return sym;
2431 }
2432 });
2433 }
2435 /** Find or create an implicit method of exactly the given type (after erasure).
2436 * Searches in a side table, not the main scope of the site.
2437 * This emulates the lookup process required by JSR 292 in JVM.
2438 * @param env Attribution environment
2439 * @param spMethod signature polymorphic method - i.e. MH.invokeExact
2440 * @param argtypes The required argument types
2441 */
2442 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
2443 final Symbol spMethod,
2444 List<Type> argtypes) {
2445 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
2446 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
2447 for (Symbol sym : polymorphicSignatureScope.getElementsByName(spMethod.name)) {
2448 if (types.isSameType(mtype, sym.type)) {
2449 return sym;
2450 }
2451 }
2453 // create the desired method
2454 long flags = ABSTRACT | HYPOTHETICAL | spMethod.flags() & Flags.AccessFlags;
2455 Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner) {
2456 @Override
2457 public Symbol baseSymbol() {
2458 return spMethod;
2459 }
2460 };
2461 polymorphicSignatureScope.enter(msym);
2462 return msym;
2463 }
2465 /** Resolve a qualified method identifier, throw a fatal error if not
2466 * found.
2467 * @param pos The position to use for error reporting.
2468 * @param env The environment current at the method invocation.
2469 * @param site The type of the qualifying expression, in which
2470 * identifier is searched.
2471 * @param name The identifier's name.
2472 * @param argtypes The types of the invocation's value arguments.
2473 * @param typeargtypes The types of the invocation's type arguments.
2474 */
2475 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
2476 Type site, Name name,
2477 List<Type> argtypes,
2478 List<Type> typeargtypes) {
2479 MethodResolutionContext resolveContext = new MethodResolutionContext();
2480 resolveContext.internalResolution = true;
2481 Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
2482 site, name, argtypes, typeargtypes);
2483 if (sym.kind == MTH) return (MethodSymbol)sym;
2484 else throw new FatalError(
2485 diags.fragment("fatal.err.cant.locate.meth",
2486 name));
2487 }
2489 /** Resolve constructor.
2490 * @param pos The position to use for error reporting.
2491 * @param env The environment current at the constructor invocation.
2492 * @param site The type of class for which a constructor is searched.
2493 * @param argtypes The types of the constructor invocation's value
2494 * arguments.
2495 * @param typeargtypes The types of the constructor invocation's type
2496 * arguments.
2497 */
2498 Symbol resolveConstructor(DiagnosticPosition pos,
2499 Env<AttrContext> env,
2500 Type site,
2501 List<Type> argtypes,
2502 List<Type> typeargtypes) {
2503 return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
2504 }
2506 private Symbol resolveConstructor(MethodResolutionContext resolveContext,
2507 final DiagnosticPosition pos,
2508 Env<AttrContext> env,
2509 Type site,
2510 List<Type> argtypes,
2511 List<Type> typeargtypes) {
2512 return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2513 @Override
2514 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2515 return findConstructor(pos, env, site, argtypes, typeargtypes,
2516 phase.isBoxingRequired(),
2517 phase.isVarargsRequired());
2518 }
2519 });
2520 }
2522 /** Resolve a constructor, throw a fatal error if not found.
2523 * @param pos The position to use for error reporting.
2524 * @param env The environment current at the method invocation.
2525 * @param site The type to be constructed.
2526 * @param argtypes The types of the invocation's value arguments.
2527 * @param typeargtypes The types of the invocation's type arguments.
2528 */
2529 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2530 Type site,
2531 List<Type> argtypes,
2532 List<Type> typeargtypes) {
2533 MethodResolutionContext resolveContext = new MethodResolutionContext();
2534 resolveContext.internalResolution = true;
2535 Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
2536 if (sym.kind == MTH) return (MethodSymbol)sym;
2537 else throw new FatalError(
2538 diags.fragment("fatal.err.cant.locate.ctor", site));
2539 }
2541 Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2542 Type site, List<Type> argtypes,
2543 List<Type> typeargtypes,
2544 boolean allowBoxing,
2545 boolean useVarargs) {
2546 Symbol sym = findMethod(env, site,
2547 names.init, argtypes,
2548 typeargtypes, allowBoxing,
2549 useVarargs, false);
2550 chk.checkDeprecated(pos, env.info.scope.owner, sym);
2551 return sym;
2552 }
2554 /** Resolve constructor using diamond inference.
2555 * @param pos The position to use for error reporting.
2556 * @param env The environment current at the constructor invocation.
2557 * @param site The type of class for which a constructor is searched.
2558 * The scope of this class has been touched in attribution.
2559 * @param argtypes The types of the constructor invocation's value
2560 * arguments.
2561 * @param typeargtypes The types of the constructor invocation's type
2562 * arguments.
2563 */
2564 Symbol resolveDiamond(DiagnosticPosition pos,
2565 Env<AttrContext> env,
2566 Type site,
2567 List<Type> argtypes,
2568 List<Type> typeargtypes) {
2569 return lookupMethod(env, pos, site.tsym, resolveMethodCheck,
2570 new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2571 @Override
2572 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2573 return findDiamond(env, site, argtypes, typeargtypes,
2574 phase.isBoxingRequired(),
2575 phase.isVarargsRequired());
2576 }
2577 @Override
2578 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2579 if (sym.kind >= AMBIGUOUS) {
2580 if (sym.kind != WRONG_MTH && sym.kind != WRONG_MTHS) {
2581 sym = super.access(env, pos, location, sym);
2582 } else {
2583 final JCDiagnostic details = sym.kind == WRONG_MTH ?
2584 ((InapplicableSymbolError)sym).errCandidate().snd :
2585 null;
2586 sym = new InapplicableSymbolError(sym.kind, "diamondError", currentResolutionContext) {
2587 @Override
2588 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
2589 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
2590 String key = details == null ?
2591 "cant.apply.diamond" :
2592 "cant.apply.diamond.1";
2593 return diags.create(dkind, log.currentSource(), pos, key,
2594 diags.fragment("diamond", site.tsym), details);
2595 }
2596 };
2597 sym = accessMethod(sym, pos, site, names.init, true, argtypes, typeargtypes);
2598 env.info.pendingResolutionPhase = currentResolutionContext.step;
2599 }
2600 }
2601 return sym;
2602 }});
2603 }
2605 /** This method scans all the constructor symbol in a given class scope -
2606 * assuming that the original scope contains a constructor of the kind:
2607 * {@code Foo(X x, Y y)}, where X,Y are class type-variables declared in Foo,
2608 * a method check is executed against the modified constructor type:
2609 * {@code <X,Y>Foo<X,Y>(X x, Y y)}. This is crucial in order to enable diamond
2610 * inference. The inferred return type of the synthetic constructor IS
2611 * the inferred type for the diamond operator.
2612 */
2613 private Symbol findDiamond(Env<AttrContext> env,
2614 Type site,
2615 List<Type> argtypes,
2616 List<Type> typeargtypes,
2617 boolean allowBoxing,
2618 boolean useVarargs) {
2619 Symbol bestSoFar = methodNotFound;
2620 for (Scope.Entry e = site.tsym.members().lookup(names.init);
2621 e.scope != null;
2622 e = e.next()) {
2623 final Symbol sym = e.sym;
2624 //- System.out.println(" e " + e.sym);
2625 if (sym.kind == MTH &&
2626 (sym.flags_field & SYNTHETIC) == 0) {
2627 List<Type> oldParams = e.sym.type.hasTag(FORALL) ?
2628 ((ForAll)sym.type).tvars :
2629 List.<Type>nil();
2630 Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
2631 types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
2632 MethodSymbol newConstr = new MethodSymbol(sym.flags(), names.init, constrType, site.tsym) {
2633 @Override
2634 public Symbol baseSymbol() {
2635 return sym;
2636 }
2637 };
2638 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
2639 newConstr,
2640 bestSoFar,
2641 allowBoxing,
2642 useVarargs,
2643 false);
2644 }
2645 }
2646 return bestSoFar;
2647 }
2651 /** Resolve operator.
2652 * @param pos The position to use for error reporting.
2653 * @param optag The tag of the operation tree.
2654 * @param env The environment current at the operation.
2655 * @param argtypes The types of the operands.
2656 */
2657 Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
2658 Env<AttrContext> env, List<Type> argtypes) {
2659 MethodResolutionContext prevResolutionContext = currentResolutionContext;
2660 try {
2661 currentResolutionContext = new MethodResolutionContext();
2662 Name name = treeinfo.operatorName(optag);
2663 return lookupMethod(env, pos, syms.predefClass, currentResolutionContext,
2664 new BasicLookupHelper(name, syms.predefClass.type, argtypes, null, BOX) {
2665 @Override
2666 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2667 return findMethod(env, site, name, argtypes, typeargtypes,
2668 phase.isBoxingRequired(),
2669 phase.isVarargsRequired(), true);
2670 }
2671 @Override
2672 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2673 return accessMethod(sym, pos, env.enclClass.sym.type, name,
2674 false, argtypes, null);
2675 }
2676 });
2677 } finally {
2678 currentResolutionContext = prevResolutionContext;
2679 }
2680 }
2682 /** Resolve operator.
2683 * @param pos The position to use for error reporting.
2684 * @param optag The tag of the operation tree.
2685 * @param env The environment current at the operation.
2686 * @param arg The type of the operand.
2687 */
2688 Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
2689 return resolveOperator(pos, optag, env, List.of(arg));
2690 }
2692 /** Resolve binary operator.
2693 * @param pos The position to use for error reporting.
2694 * @param optag The tag of the operation tree.
2695 * @param env The environment current at the operation.
2696 * @param left The types of the left operand.
2697 * @param right The types of the right operand.
2698 */
2699 Symbol resolveBinaryOperator(DiagnosticPosition pos,
2700 JCTree.Tag optag,
2701 Env<AttrContext> env,
2702 Type left,
2703 Type right) {
2704 return resolveOperator(pos, optag, env, List.of(left, right));
2705 }
2707 Symbol getMemberReference(DiagnosticPosition pos,
2708 Env<AttrContext> env,
2709 JCMemberReference referenceTree,
2710 Type site,
2711 Name name) {
2713 site = types.capture(site);
2715 ReferenceLookupHelper lookupHelper = makeReferenceLookupHelper(
2716 referenceTree, site, name, List.<Type>nil(), null, VARARITY);
2718 Env<AttrContext> newEnv = env.dup(env.tree, env.info.dup());
2719 Symbol sym = lookupMethod(newEnv, env.tree.pos(), site.tsym,
2720 nilMethodCheck, lookupHelper);
2722 env.info.pendingResolutionPhase = newEnv.info.pendingResolutionPhase;
2724 return sym;
2725 }
2727 ReferenceLookupHelper makeReferenceLookupHelper(JCMemberReference referenceTree,
2728 Type site,
2729 Name name,
2730 List<Type> argtypes,
2731 List<Type> typeargtypes,
2732 MethodResolutionPhase maxPhase) {
2733 ReferenceLookupHelper result;
2734 if (!name.equals(names.init)) {
2735 //method reference
2736 result =
2737 new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
2738 } else {
2739 if (site.hasTag(ARRAY)) {
2740 //array constructor reference
2741 result =
2742 new ArrayConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
2743 } else {
2744 //class constructor reference
2745 result =
2746 new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
2747 }
2748 }
2749 return result;
2750 }
2752 Symbol resolveMemberReferenceByArity(Env<AttrContext> env,
2753 JCMemberReference referenceTree,
2754 Type site,
2755 Name name,
2756 List<Type> argtypes,
2757 InferenceContext inferenceContext) {
2759 boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
2760 site = types.capture(site);
2762 ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
2763 referenceTree, site, name, argtypes, null, VARARITY);
2764 //step 1 - bound lookup
2765 Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
2766 Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(), site.tsym,
2767 arityMethodCheck, boundLookupHelper);
2768 if (isStaticSelector &&
2769 !name.equals(names.init) &&
2770 !boundSym.isStatic() &&
2771 boundSym.kind < ERRONEOUS) {
2772 boundSym = methodNotFound;
2773 }
2775 //step 2 - unbound lookup
2776 Symbol unboundSym = methodNotFound;
2777 ReferenceLookupHelper unboundLookupHelper = null;
2778 Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
2779 if (isStaticSelector) {
2780 unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
2781 unboundSym = lookupMethod(unboundEnv, env.tree.pos(), site.tsym,
2782 arityMethodCheck, unboundLookupHelper);
2783 if (unboundSym.isStatic() &&
2784 unboundSym.kind < ERRONEOUS) {
2785 unboundSym = methodNotFound;
2786 }
2787 }
2789 //merge results
2790 Symbol bestSym = choose(boundSym, unboundSym);
2791 env.info.pendingResolutionPhase = bestSym == unboundSym ?
2792 unboundEnv.info.pendingResolutionPhase :
2793 boundEnv.info.pendingResolutionPhase;
2795 return bestSym;
2796 }
2798 /**
2799 * Resolution of member references is typically done as a single
2800 * overload resolution step, where the argument types A are inferred from
2801 * the target functional descriptor.
2802 *
2803 * If the member reference is a method reference with a type qualifier,
2804 * a two-step lookup process is performed. The first step uses the
2805 * expected argument list A, while the second step discards the first
2806 * type from A (which is treated as a receiver type).
2807 *
2808 * There are two cases in which inference is performed: (i) if the member
2809 * reference is a constructor reference and the qualifier type is raw - in
2810 * which case diamond inference is used to infer a parameterization for the
2811 * type qualifier; (ii) if the member reference is an unbound reference
2812 * where the type qualifier is raw - in that case, during the unbound lookup
2813 * the receiver argument type is used to infer an instantiation for the raw
2814 * qualifier type.
2815 *
2816 * When a multi-step resolution process is exploited, it is an error
2817 * if two candidates are found (ambiguity).
2818 *
2819 * This routine returns a pair (T,S), where S is the member reference symbol,
2820 * and T is the type of the class in which S is defined. This is necessary as
2821 * the type T might be dynamically inferred (i.e. if constructor reference
2822 * has a raw qualifier).
2823 */
2824 Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(Env<AttrContext> env,
2825 JCMemberReference referenceTree,
2826 Type site,
2827 Name name,
2828 List<Type> argtypes,
2829 List<Type> typeargtypes,
2830 MethodCheck methodCheck,
2831 InferenceContext inferenceContext,
2832 AttrMode mode) {
2834 site = types.capture(site);
2835 ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
2836 referenceTree, site, name, argtypes, typeargtypes, VARARITY);
2838 //step 1 - bound lookup
2839 Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
2840 Symbol origBoundSym;
2841 boolean staticErrorForBound = false;
2842 MethodResolutionContext boundSearchResolveContext = new MethodResolutionContext();
2843 boundSearchResolveContext.methodCheck = methodCheck;
2844 Symbol boundSym = origBoundSym = lookupMethod(boundEnv, env.tree.pos(),
2845 site.tsym, boundSearchResolveContext, boundLookupHelper);
2846 SearchResultKind boundSearchResultKind = SearchResultKind.NOT_APPLICABLE_MATCH;
2847 boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
2848 boolean shouldCheckForStaticness = isStaticSelector &&
2849 referenceTree.getMode() == ReferenceMode.INVOKE;
2850 if (boundSym.kind != WRONG_MTHS && boundSym.kind != WRONG_MTH) {
2851 if (shouldCheckForStaticness) {
2852 if (!boundSym.isStatic()) {
2853 staticErrorForBound = true;
2854 if (hasAnotherApplicableMethod(
2855 boundSearchResolveContext, boundSym, true)) {
2856 boundSearchResultKind = SearchResultKind.BAD_MATCH_MORE_SPECIFIC;
2857 } else {
2858 boundSearchResultKind = SearchResultKind.BAD_MATCH;
2859 if (boundSym.kind < ERRONEOUS) {
2860 boundSym = methodWithCorrectStaticnessNotFound;
2861 }
2862 }
2863 } else if (boundSym.kind < ERRONEOUS) {
2864 boundSearchResultKind = SearchResultKind.GOOD_MATCH;
2865 }
2866 }
2867 }
2869 //step 2 - unbound lookup
2870 Symbol origUnboundSym = null;
2871 Symbol unboundSym = methodNotFound;
2872 ReferenceLookupHelper unboundLookupHelper = null;
2873 Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
2874 SearchResultKind unboundSearchResultKind = SearchResultKind.NOT_APPLICABLE_MATCH;
2875 boolean staticErrorForUnbound = false;
2876 if (isStaticSelector) {
2877 unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
2878 MethodResolutionContext unboundSearchResolveContext =
2879 new MethodResolutionContext();
2880 unboundSearchResolveContext.methodCheck = methodCheck;
2881 unboundSym = origUnboundSym = lookupMethod(unboundEnv, env.tree.pos(),
2882 site.tsym, unboundSearchResolveContext, unboundLookupHelper);
2884 if (unboundSym.kind != WRONG_MTH && unboundSym.kind != WRONG_MTHS) {
2885 if (shouldCheckForStaticness) {
2886 if (unboundSym.isStatic()) {
2887 staticErrorForUnbound = true;
2888 if (hasAnotherApplicableMethod(
2889 unboundSearchResolveContext, unboundSym, false)) {
2890 unboundSearchResultKind = SearchResultKind.BAD_MATCH_MORE_SPECIFIC;
2891 } else {
2892 unboundSearchResultKind = SearchResultKind.BAD_MATCH;
2893 if (unboundSym.kind < ERRONEOUS) {
2894 unboundSym = methodWithCorrectStaticnessNotFound;
2895 }
2896 }
2897 } else if (unboundSym.kind < ERRONEOUS) {
2898 unboundSearchResultKind = SearchResultKind.GOOD_MATCH;
2899 }
2900 }
2901 }
2902 }
2904 //merge results
2905 Pair<Symbol, ReferenceLookupHelper> res;
2906 Symbol bestSym = choose(boundSym, unboundSym);
2907 if (bestSym.kind < ERRONEOUS && (staticErrorForBound || staticErrorForUnbound)) {
2908 if (staticErrorForBound) {
2909 boundSym = methodWithCorrectStaticnessNotFound;
2910 }
2911 if (staticErrorForUnbound) {
2912 unboundSym = methodWithCorrectStaticnessNotFound;
2913 }
2914 bestSym = choose(boundSym, unboundSym);
2915 }
2916 if (bestSym == methodWithCorrectStaticnessNotFound && mode == AttrMode.CHECK) {
2917 Symbol symToPrint = origBoundSym;
2918 String errorFragmentToPrint = "non-static.cant.be.ref";
2919 if (staticErrorForBound && staticErrorForUnbound) {
2920 if (unboundSearchResultKind == SearchResultKind.BAD_MATCH_MORE_SPECIFIC) {
2921 symToPrint = origUnboundSym;
2922 errorFragmentToPrint = "static.method.in.unbound.lookup";
2923 }
2924 } else {
2925 if (!staticErrorForBound) {
2926 symToPrint = origUnboundSym;
2927 errorFragmentToPrint = "static.method.in.unbound.lookup";
2928 }
2929 }
2930 log.error(referenceTree.expr.pos(), "invalid.mref",
2931 Kinds.kindName(referenceTree.getMode()),
2932 diags.fragment(errorFragmentToPrint,
2933 Kinds.kindName(symToPrint), symToPrint));
2934 }
2935 res = new Pair<>(bestSym,
2936 bestSym == unboundSym ? unboundLookupHelper : boundLookupHelper);
2937 env.info.pendingResolutionPhase = bestSym == unboundSym ?
2938 unboundEnv.info.pendingResolutionPhase :
2939 boundEnv.info.pendingResolutionPhase;
2941 return res;
2942 }
2944 enum SearchResultKind {
2945 GOOD_MATCH, //type I
2946 BAD_MATCH_MORE_SPECIFIC, //type II
2947 BAD_MATCH, //type III
2948 NOT_APPLICABLE_MATCH //type IV
2949 }
2951 boolean hasAnotherApplicableMethod(MethodResolutionContext resolutionContext,
2952 Symbol bestSoFar, boolean staticMth) {
2953 for (Candidate c : resolutionContext.candidates) {
2954 if (resolutionContext.step != c.step ||
2955 !c.isApplicable() ||
2956 c.sym == bestSoFar) {
2957 continue;
2958 } else {
2959 if (c.sym.isStatic() == staticMth) {
2960 return true;
2961 }
2962 }
2963 }
2964 return false;
2965 }
2967 //where
2968 private Symbol choose(Symbol boundSym, Symbol unboundSym) {
2969 if (lookupSuccess(boundSym) && lookupSuccess(unboundSym)) {
2970 return ambiguityError(boundSym, unboundSym);
2971 } else if (lookupSuccess(boundSym) ||
2972 (canIgnore(unboundSym) && !canIgnore(boundSym))) {
2973 return boundSym;
2974 } else if (lookupSuccess(unboundSym) ||
2975 (canIgnore(boundSym) && !canIgnore(unboundSym))) {
2976 return unboundSym;
2977 } else {
2978 return boundSym;
2979 }
2980 }
2982 private boolean lookupSuccess(Symbol s) {
2983 return s.kind == MTH || s.kind == AMBIGUOUS;
2984 }
2986 private boolean canIgnore(Symbol s) {
2987 switch (s.kind) {
2988 case ABSENT_MTH:
2989 return true;
2990 case WRONG_MTH:
2991 InapplicableSymbolError errSym =
2992 (InapplicableSymbolError)s;
2993 return new Template(MethodCheckDiag.ARITY_MISMATCH.regex())
2994 .matches(errSym.errCandidate().snd);
2995 case WRONG_MTHS:
2996 InapplicableSymbolsError errSyms =
2997 (InapplicableSymbolsError)s;
2998 return errSyms.filterCandidates(errSyms.mapCandidates()).isEmpty();
2999 case WRONG_STATICNESS:
3000 return false;
3001 default:
3002 return false;
3003 }
3004 }
3006 /**
3007 * Helper for defining custom method-like lookup logic; a lookup helper
3008 * provides hooks for (i) the actual lookup logic and (ii) accessing the
3009 * lookup result (this step might result in compiler diagnostics to be generated)
3010 */
3011 abstract class LookupHelper {
3013 /** name of the symbol to lookup */
3014 Name name;
3016 /** location in which the lookup takes place */
3017 Type site;
3019 /** actual types used during the lookup */
3020 List<Type> argtypes;
3022 /** type arguments used during the lookup */
3023 List<Type> typeargtypes;
3025 /** Max overload resolution phase handled by this helper */
3026 MethodResolutionPhase maxPhase;
3028 LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3029 this.name = name;
3030 this.site = site;
3031 this.argtypes = argtypes;
3032 this.typeargtypes = typeargtypes;
3033 this.maxPhase = maxPhase;
3034 }
3036 /**
3037 * Should lookup stop at given phase with given result
3038 */
3039 protected boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
3040 return phase.ordinal() > maxPhase.ordinal() ||
3041 sym.kind < ERRONEOUS || sym.kind == AMBIGUOUS;
3042 }
3044 /**
3045 * Search for a symbol under a given overload resolution phase - this method
3046 * is usually called several times, once per each overload resolution phase
3047 */
3048 abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
3050 /**
3051 * Dump overload resolution info
3052 */
3053 void debug(DiagnosticPosition pos, Symbol sym) {
3054 //do nothing
3055 }
3057 /**
3058 * Validate the result of the lookup
3059 */
3060 abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
3061 }
3063 abstract class BasicLookupHelper extends LookupHelper {
3065 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
3066 this(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
3067 }
3069 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3070 super(name, site, argtypes, typeargtypes, maxPhase);
3071 }
3073 @Override
3074 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3075 Symbol sym = doLookup(env, phase);
3076 if (sym.kind == AMBIGUOUS) {
3077 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3078 sym = a_err.mergeAbstracts(site);
3079 }
3080 return sym;
3081 }
3083 abstract Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase);
3085 @Override
3086 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3087 if (sym.kind >= AMBIGUOUS) {
3088 //if nothing is found return the 'first' error
3089 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
3090 }
3091 return sym;
3092 }
3094 @Override
3095 void debug(DiagnosticPosition pos, Symbol sym) {
3096 reportVerboseResolutionDiagnostic(pos, name, site, argtypes, typeargtypes, sym);
3097 }
3098 }
3100 /**
3101 * Helper class for member reference lookup. A reference lookup helper
3102 * defines the basic logic for member reference lookup; a method gives
3103 * access to an 'unbound' helper used to perform an unbound member
3104 * reference lookup.
3105 */
3106 abstract class ReferenceLookupHelper extends LookupHelper {
3108 /** The member reference tree */
3109 JCMemberReference referenceTree;
3111 ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3112 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3113 super(name, site, argtypes, typeargtypes, maxPhase);
3114 this.referenceTree = referenceTree;
3115 }
3117 /**
3118 * Returns an unbound version of this lookup helper. By default, this
3119 * method returns an dummy lookup helper.
3120 */
3121 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3122 //dummy loopkup helper that always return 'methodNotFound'
3123 return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
3124 @Override
3125 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3126 return this;
3127 }
3128 @Override
3129 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3130 return methodNotFound;
3131 }
3132 @Override
3133 ReferenceKind referenceKind(Symbol sym) {
3134 Assert.error();
3135 return null;
3136 }
3137 };
3138 }
3140 /**
3141 * Get the kind of the member reference
3142 */
3143 abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
3145 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3146 if (sym.kind == AMBIGUOUS) {
3147 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3148 sym = a_err.mergeAbstracts(site);
3149 }
3150 //skip error reporting
3151 return sym;
3152 }
3153 }
3155 /**
3156 * Helper class for method reference lookup. The lookup logic is based
3157 * upon Resolve.findMethod; in certain cases, this helper class has a
3158 * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
3159 * In such cases, non-static lookup results are thrown away.
3160 */
3161 class MethodReferenceLookupHelper extends ReferenceLookupHelper {
3163 MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3164 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3165 super(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
3166 }
3168 @Override
3169 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3170 return findMethod(env, site, name, argtypes, typeargtypes,
3171 phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
3172 }
3174 @Override
3175 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3176 if (TreeInfo.isStaticSelector(referenceTree.expr, names) &&
3177 argtypes.nonEmpty() &&
3178 (argtypes.head.hasTag(NONE) ||
3179 types.isSubtypeUnchecked(inferenceContext.asUndetVar(argtypes.head), site))) {
3180 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
3181 site, argtypes, typeargtypes, maxPhase);
3182 } else {
3183 return super.unboundLookup(inferenceContext);
3184 }
3185 }
3187 @Override
3188 ReferenceKind referenceKind(Symbol sym) {
3189 if (sym.isStatic()) {
3190 return ReferenceKind.STATIC;
3191 } else {
3192 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
3193 return selName != null && selName == names._super ?
3194 ReferenceKind.SUPER :
3195 ReferenceKind.BOUND;
3196 }
3197 }
3198 }
3200 /**
3201 * Helper class for unbound method reference lookup. Essentially the same
3202 * as the basic method reference lookup helper; main difference is that static
3203 * lookup results are thrown away. If qualifier type is raw, an attempt to
3204 * infer a parameterized type is made using the first actual argument (that
3205 * would otherwise be ignored during the lookup).
3206 */
3207 class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
3209 UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3210 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3211 super(referenceTree, name, site, argtypes.tail, typeargtypes, maxPhase);
3212 if (site.isRaw() && !argtypes.head.hasTag(NONE)) {
3213 Type asSuperSite = types.asSuper(argtypes.head, site.tsym);
3214 this.site = asSuperSite;
3215 }
3216 }
3218 @Override
3219 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3220 return this;
3221 }
3223 @Override
3224 ReferenceKind referenceKind(Symbol sym) {
3225 return ReferenceKind.UNBOUND;
3226 }
3227 }
3229 /**
3230 * Helper class for array constructor lookup; an array constructor lookup
3231 * is simulated by looking up a method that returns the array type specified
3232 * as qualifier, and that accepts a single int parameter (size of the array).
3233 */
3234 class ArrayConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3236 ArrayConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3237 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3238 super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
3239 }
3241 @Override
3242 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3243 Scope sc = new Scope(syms.arrayClass);
3244 MethodSymbol arrayConstr = new MethodSymbol(PUBLIC, name, null, site.tsym);
3245 arrayConstr.type = new MethodType(List.<Type>of(syms.intType), site, List.<Type>nil(), syms.methodClass);
3246 sc.enter(arrayConstr);
3247 return findMethodInScope(env, site, name, argtypes, typeargtypes, sc, methodNotFound, phase.isBoxingRequired(), phase.isVarargsRequired(), false, false);
3248 }
3250 @Override
3251 ReferenceKind referenceKind(Symbol sym) {
3252 return ReferenceKind.ARRAY_CTOR;
3253 }
3254 }
3256 /**
3257 * Helper class for constructor reference lookup. The lookup logic is based
3258 * upon either Resolve.findMethod or Resolve.findDiamond - depending on
3259 * whether the constructor reference needs diamond inference (this is the case
3260 * if the qualifier type is raw). A special erroneous symbol is returned
3261 * if the lookup returns the constructor of an inner class and there's no
3262 * enclosing instance in scope.
3263 */
3264 class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3266 boolean needsInference;
3268 ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3269 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3270 super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
3271 if (site.isRaw()) {
3272 this.site = new ClassType(site.getEnclosingType(), site.tsym.type.getTypeArguments(), site.tsym);
3273 needsInference = true;
3274 }
3275 }
3277 @Override
3278 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3279 Symbol sym = needsInference ?
3280 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
3281 findMethod(env, site, name, argtypes, typeargtypes,
3282 phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
3283 return sym.kind != MTH ||
3284 site.getEnclosingType().hasTag(NONE) ||
3285 hasEnclosingInstance(env, site) ?
3286 sym : new InvalidSymbolError(Kinds.MISSING_ENCL, sym, null) {
3287 @Override
3288 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
3289 return diags.create(dkind, log.currentSource(), pos,
3290 "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
3291 }
3292 };
3293 }
3295 @Override
3296 ReferenceKind referenceKind(Symbol sym) {
3297 return site.getEnclosingType().hasTag(NONE) ?
3298 ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
3299 }
3300 }
3302 /**
3303 * Main overload resolution routine. On each overload resolution step, a
3304 * lookup helper class is used to perform the method/constructor lookup;
3305 * at the end of the lookup, the helper is used to validate the results
3306 * (this last step might trigger overload resolution diagnostics).
3307 */
3308 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, MethodCheck methodCheck, LookupHelper lookupHelper) {
3309 MethodResolutionContext resolveContext = new MethodResolutionContext();
3310 resolveContext.methodCheck = methodCheck;
3311 return lookupMethod(env, pos, location, resolveContext, lookupHelper);
3312 }
3314 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
3315 MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
3316 MethodResolutionContext prevResolutionContext = currentResolutionContext;
3317 try {
3318 Symbol bestSoFar = methodNotFound;
3319 currentResolutionContext = resolveContext;
3320 for (MethodResolutionPhase phase : methodResolutionSteps) {
3321 if (!phase.isApplicable(boxingEnabled, varargsEnabled) ||
3322 lookupHelper.shouldStop(bestSoFar, phase)) break;
3323 MethodResolutionPhase prevPhase = currentResolutionContext.step;
3324 Symbol prevBest = bestSoFar;
3325 currentResolutionContext.step = phase;
3326 Symbol sym = lookupHelper.lookup(env, phase);
3327 lookupHelper.debug(pos, sym);
3328 bestSoFar = phase.mergeResults(bestSoFar, sym);
3329 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
3330 }
3331 return lookupHelper.access(env, pos, location, bestSoFar);
3332 } finally {
3333 currentResolutionContext = prevResolutionContext;
3334 }
3335 }
3337 /**
3338 * Resolve `c.name' where name == this or name == super.
3339 * @param pos The position to use for error reporting.
3340 * @param env The environment current at the expression.
3341 * @param c The qualifier.
3342 * @param name The identifier's name.
3343 */
3344 Symbol resolveSelf(DiagnosticPosition pos,
3345 Env<AttrContext> env,
3346 TypeSymbol c,
3347 Name name) {
3348 Env<AttrContext> env1 = env;
3349 boolean staticOnly = false;
3350 while (env1.outer != null) {
3351 if (isStatic(env1)) staticOnly = true;
3352 if (env1.enclClass.sym == c) {
3353 Symbol sym = env1.info.scope.lookup(name).sym;
3354 if (sym != null) {
3355 if (staticOnly) sym = new StaticError(sym);
3356 return accessBase(sym, pos, env.enclClass.sym.type,
3357 name, true);
3358 }
3359 }
3360 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
3361 env1 = env1.outer;
3362 }
3363 if (c.isInterface() &&
3364 name == names._super && !isStatic(env) &&
3365 types.isDirectSuperInterface(c, env.enclClass.sym)) {
3366 //this might be a default super call if one of the superinterfaces is 'c'
3367 for (Type t : pruneInterfaces(env.enclClass.type)) {
3368 if (t.tsym == c) {
3369 env.info.defaultSuperCallSite = t;
3370 return new VarSymbol(0, names._super,
3371 types.asSuper(env.enclClass.type, c), env.enclClass.sym);
3372 }
3373 }
3374 //find a direct superinterface that is a subtype of 'c'
3375 for (Type i : types.interfaces(env.enclClass.type)) {
3376 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
3377 log.error(pos, "illegal.default.super.call", c,
3378 diags.fragment("redundant.supertype", c, i));
3379 return syms.errSymbol;
3380 }
3381 }
3382 Assert.error();
3383 }
3384 log.error(pos, "not.encl.class", c);
3385 return syms.errSymbol;
3386 }
3387 //where
3388 private List<Type> pruneInterfaces(Type t) {
3389 ListBuffer<Type> result = new ListBuffer<>();
3390 for (Type t1 : types.interfaces(t)) {
3391 boolean shouldAdd = true;
3392 for (Type t2 : types.interfaces(t)) {
3393 if (t1 != t2 && types.isSubtypeNoCapture(t2, t1)) {
3394 shouldAdd = false;
3395 }
3396 }
3397 if (shouldAdd) {
3398 result.append(t1);
3399 }
3400 }
3401 return result.toList();
3402 }
3405 /**
3406 * Resolve `c.this' for an enclosing class c that contains the
3407 * named member.
3408 * @param pos The position to use for error reporting.
3409 * @param env The environment current at the expression.
3410 * @param member The member that must be contained in the result.
3411 */
3412 Symbol resolveSelfContaining(DiagnosticPosition pos,
3413 Env<AttrContext> env,
3414 Symbol member,
3415 boolean isSuperCall) {
3416 Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
3417 if (sym == null) {
3418 log.error(pos, "encl.class.required", member);
3419 return syms.errSymbol;
3420 } else {
3421 return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
3422 }
3423 }
3425 boolean hasEnclosingInstance(Env<AttrContext> env, Type type) {
3426 Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
3427 return encl != null && encl.kind < ERRONEOUS;
3428 }
3430 private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
3431 Symbol member,
3432 boolean isSuperCall) {
3433 Name name = names._this;
3434 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
3435 boolean staticOnly = false;
3436 if (env1 != null) {
3437 while (env1 != null && env1.outer != null) {
3438 if (isStatic(env1)) staticOnly = true;
3439 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
3440 Symbol sym = env1.info.scope.lookup(name).sym;
3441 if (sym != null) {
3442 if (staticOnly) sym = new StaticError(sym);
3443 return sym;
3444 }
3445 }
3446 if ((env1.enclClass.sym.flags() & STATIC) != 0)
3447 staticOnly = true;
3448 env1 = env1.outer;
3449 }
3450 }
3451 return null;
3452 }
3454 /**
3455 * Resolve an appropriate implicit this instance for t's container.
3456 * JLS 8.8.5.1 and 15.9.2
3457 */
3458 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
3459 return resolveImplicitThis(pos, env, t, false);
3460 }
3462 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
3463 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
3464 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
3465 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
3466 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
3467 log.error(pos, "cant.ref.before.ctor.called", "this");
3468 return thisType;
3469 }
3471 /* ***************************************************************************
3472 * ResolveError classes, indicating error situations when accessing symbols
3473 ****************************************************************************/
3475 //used by TransTypes when checking target type of synthetic cast
3476 public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
3477 AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
3478 logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
3479 }
3480 //where
3481 private void logResolveError(ResolveError error,
3482 DiagnosticPosition pos,
3483 Symbol location,
3484 Type site,
3485 Name name,
3486 List<Type> argtypes,
3487 List<Type> typeargtypes) {
3488 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3489 pos, location, site, name, argtypes, typeargtypes);
3490 if (d != null) {
3491 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
3492 log.report(d);
3493 }
3494 }
3496 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
3498 public Object methodArguments(List<Type> argtypes) {
3499 if (argtypes == null || argtypes.isEmpty()) {
3500 return noArgs;
3501 } else {
3502 ListBuffer<Object> diagArgs = new ListBuffer<>();
3503 for (Type t : argtypes) {
3504 if (t.hasTag(DEFERRED)) {
3505 diagArgs.append(((DeferredAttr.DeferredType)t).tree);
3506 } else {
3507 diagArgs.append(t);
3508 }
3509 }
3510 return diagArgs;
3511 }
3512 }
3514 /**
3515 * Root class for resolution errors. Subclass of ResolveError
3516 * represent a different kinds of resolution error - as such they must
3517 * specify how they map into concrete compiler diagnostics.
3518 */
3519 abstract class ResolveError extends Symbol {
3521 /** The name of the kind of error, for debugging only. */
3522 final String debugName;
3524 ResolveError(int kind, String debugName) {
3525 super(kind, 0, null, null, null);
3526 this.debugName = debugName;
3527 }
3529 @Override
3530 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
3531 throw new AssertionError();
3532 }
3534 @Override
3535 public String toString() {
3536 return debugName;
3537 }
3539 @Override
3540 public boolean exists() {
3541 return false;
3542 }
3544 @Override
3545 public boolean isStatic() {
3546 return false;
3547 }
3549 /**
3550 * Create an external representation for this erroneous symbol to be
3551 * used during attribution - by default this returns the symbol of a
3552 * brand new error type which stores the original type found
3553 * during resolution.
3554 *
3555 * @param name the name used during resolution
3556 * @param location the location from which the symbol is accessed
3557 */
3558 protected Symbol access(Name name, TypeSymbol location) {
3559 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
3560 }
3562 /**
3563 * Create a diagnostic representing this resolution error.
3564 *
3565 * @param dkind The kind of the diagnostic to be created (e.g error).
3566 * @param pos The position to be used for error reporting.
3567 * @param site The original type from where the selection took place.
3568 * @param name The name of the symbol to be resolved.
3569 * @param argtypes The invocation's value arguments,
3570 * if we looked for a method.
3571 * @param typeargtypes The invocation's type arguments,
3572 * if we looked for a method.
3573 */
3574 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3575 DiagnosticPosition pos,
3576 Symbol location,
3577 Type site,
3578 Name name,
3579 List<Type> argtypes,
3580 List<Type> typeargtypes);
3581 }
3583 /**
3584 * This class is the root class of all resolution errors caused by
3585 * an invalid symbol being found during resolution.
3586 */
3587 abstract class InvalidSymbolError extends ResolveError {
3589 /** The invalid symbol found during resolution */
3590 Symbol sym;
3592 InvalidSymbolError(int kind, Symbol sym, String debugName) {
3593 super(kind, debugName);
3594 this.sym = sym;
3595 }
3597 @Override
3598 public boolean exists() {
3599 return true;
3600 }
3602 @Override
3603 public String toString() {
3604 return super.toString() + " wrongSym=" + sym;
3605 }
3607 @Override
3608 public Symbol access(Name name, TypeSymbol location) {
3609 if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
3610 return types.createErrorType(name, location, sym.type).tsym;
3611 else
3612 return sym;
3613 }
3614 }
3616 /**
3617 * InvalidSymbolError error class indicating that a symbol matching a
3618 * given name does not exists in a given site.
3619 */
3620 class SymbolNotFoundError extends ResolveError {
3622 SymbolNotFoundError(int kind) {
3623 this(kind, "symbol not found error");
3624 }
3626 SymbolNotFoundError(int kind, String debugName) {
3627 super(kind, debugName);
3628 }
3630 @Override
3631 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3632 DiagnosticPosition pos,
3633 Symbol location,
3634 Type site,
3635 Name name,
3636 List<Type> argtypes,
3637 List<Type> typeargtypes) {
3638 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
3639 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
3640 if (name == names.error)
3641 return null;
3643 if (syms.operatorNames.contains(name)) {
3644 boolean isUnaryOp = argtypes.size() == 1;
3645 String key = argtypes.size() == 1 ?
3646 "operator.cant.be.applied" :
3647 "operator.cant.be.applied.1";
3648 Type first = argtypes.head;
3649 Type second = !isUnaryOp ? argtypes.tail.head : null;
3650 return diags.create(dkind, log.currentSource(), pos,
3651 key, name, first, second);
3652 }
3653 boolean hasLocation = false;
3654 if (location == null) {
3655 location = site.tsym;
3656 }
3657 if (!location.name.isEmpty()) {
3658 if (location.kind == PCK && !site.tsym.exists()) {
3659 return diags.create(dkind, log.currentSource(), pos,
3660 "doesnt.exist", location);
3661 }
3662 hasLocation = !location.name.equals(names._this) &&
3663 !location.name.equals(names._super);
3664 }
3665 boolean isConstructor = (kind == ABSENT_MTH || kind == WRONG_STATICNESS) &&
3666 name == names.init;
3667 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
3668 Name idname = isConstructor ? site.tsym.name : name;
3669 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
3670 if (hasLocation) {
3671 return diags.create(dkind, log.currentSource(), pos,
3672 errKey, kindname, idname, //symbol kindname, name
3673 typeargtypes, args(argtypes), //type parameters and arguments (if any)
3674 getLocationDiag(location, site)); //location kindname, type
3675 }
3676 else {
3677 return diags.create(dkind, log.currentSource(), pos,
3678 errKey, kindname, idname, //symbol kindname, name
3679 typeargtypes, args(argtypes)); //type parameters and arguments (if any)
3680 }
3681 }
3682 //where
3683 private Object args(List<Type> args) {
3684 return args.isEmpty() ? args : methodArguments(args);
3685 }
3687 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
3688 String key = "cant.resolve";
3689 String suffix = hasLocation ? ".location" : "";
3690 switch (kindname) {
3691 case METHOD:
3692 case CONSTRUCTOR: {
3693 suffix += ".args";
3694 suffix += hasTypeArgs ? ".params" : "";
3695 }
3696 }
3697 return key + suffix;
3698 }
3699 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
3700 if (location.kind == VAR) {
3701 return diags.fragment("location.1",
3702 kindName(location),
3703 location,
3704 location.type);
3705 } else {
3706 return diags.fragment("location",
3707 typeKindName(site),
3708 site,
3709 null);
3710 }
3711 }
3712 }
3714 /**
3715 * InvalidSymbolError error class indicating that a given symbol
3716 * (either a method, a constructor or an operand) is not applicable
3717 * given an actual arguments/type argument list.
3718 */
3719 class InapplicableSymbolError extends ResolveError {
3721 protected MethodResolutionContext resolveContext;
3723 InapplicableSymbolError(MethodResolutionContext context) {
3724 this(WRONG_MTH, "inapplicable symbol error", context);
3725 }
3727 protected InapplicableSymbolError(int kind, String debugName, MethodResolutionContext context) {
3728 super(kind, debugName);
3729 this.resolveContext = context;
3730 }
3732 @Override
3733 public String toString() {
3734 return super.toString();
3735 }
3737 @Override
3738 public boolean exists() {
3739 return true;
3740 }
3742 @Override
3743 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3744 DiagnosticPosition pos,
3745 Symbol location,
3746 Type site,
3747 Name name,
3748 List<Type> argtypes,
3749 List<Type> typeargtypes) {
3750 if (name == names.error)
3751 return null;
3753 if (syms.operatorNames.contains(name)) {
3754 boolean isUnaryOp = argtypes.size() == 1;
3755 String key = argtypes.size() == 1 ?
3756 "operator.cant.be.applied" :
3757 "operator.cant.be.applied.1";
3758 Type first = argtypes.head;
3759 Type second = !isUnaryOp ? argtypes.tail.head : null;
3760 return diags.create(dkind, log.currentSource(), pos,
3761 key, name, first, second);
3762 }
3763 else {
3764 Pair<Symbol, JCDiagnostic> c = errCandidate();
3765 if (compactMethodDiags) {
3766 for (Map.Entry<Template, DiagnosticRewriter> _entry :
3767 MethodResolutionDiagHelper.rewriters.entrySet()) {
3768 if (_entry.getKey().matches(c.snd)) {
3769 JCDiagnostic simpleDiag =
3770 _entry.getValue().rewriteDiagnostic(diags, pos,
3771 log.currentSource(), dkind, c.snd);
3772 simpleDiag.setFlag(DiagnosticFlag.COMPRESSED);
3773 return simpleDiag;
3774 }
3775 }
3776 }
3777 Symbol ws = c.fst.asMemberOf(site, types);
3778 return diags.create(dkind, log.currentSource(), pos,
3779 "cant.apply.symbol",
3780 kindName(ws),
3781 ws.name == names.init ? ws.owner.name : ws.name,
3782 methodArguments(ws.type.getParameterTypes()),
3783 methodArguments(argtypes),
3784 kindName(ws.owner),
3785 ws.owner.type,
3786 c.snd);
3787 }
3788 }
3790 @Override
3791 public Symbol access(Name name, TypeSymbol location) {
3792 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
3793 }
3795 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3796 Candidate bestSoFar = null;
3797 for (Candidate c : resolveContext.candidates) {
3798 if (c.isApplicable()) continue;
3799 bestSoFar = c;
3800 }
3801 Assert.checkNonNull(bestSoFar);
3802 return new Pair<Symbol, JCDiagnostic>(bestSoFar.sym, bestSoFar.details);
3803 }
3804 }
3806 /**
3807 * ResolveError error class indicating that a set of symbols
3808 * (either methods, constructors or operands) is not applicable
3809 * given an actual arguments/type argument list.
3810 */
3811 class InapplicableSymbolsError extends InapplicableSymbolError {
3813 InapplicableSymbolsError(MethodResolutionContext context) {
3814 super(WRONG_MTHS, "inapplicable symbols", context);
3815 }
3817 @Override
3818 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3819 DiagnosticPosition pos,
3820 Symbol location,
3821 Type site,
3822 Name name,
3823 List<Type> argtypes,
3824 List<Type> typeargtypes) {
3825 Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
3826 Map<Symbol, JCDiagnostic> filteredCandidates = compactMethodDiags ?
3827 filterCandidates(candidatesMap) :
3828 mapCandidates();
3829 if (filteredCandidates.isEmpty()) {
3830 filteredCandidates = candidatesMap;
3831 }
3832 boolean truncatedDiag = candidatesMap.size() != filteredCandidates.size();
3833 if (filteredCandidates.size() > 1) {
3834 JCDiagnostic err = diags.create(dkind,
3835 null,
3836 truncatedDiag ?
3837 EnumSet.of(DiagnosticFlag.COMPRESSED) :
3838 EnumSet.noneOf(DiagnosticFlag.class),
3839 log.currentSource(),
3840 pos,
3841 "cant.apply.symbols",
3842 name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
3843 name == names.init ? site.tsym.name : name,
3844 methodArguments(argtypes));
3845 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(filteredCandidates, site));
3846 } else if (filteredCandidates.size() == 1) {
3847 Map.Entry<Symbol, JCDiagnostic> _e =
3848 filteredCandidates.entrySet().iterator().next();
3849 final Pair<Symbol, JCDiagnostic> p = new Pair<Symbol, JCDiagnostic>(_e.getKey(), _e.getValue());
3850 JCDiagnostic d = new InapplicableSymbolError(resolveContext) {
3851 @Override
3852 protected Pair<Symbol, JCDiagnostic> errCandidate() {
3853 return p;
3854 }
3855 }.getDiagnostic(dkind, pos,
3856 location, site, name, argtypes, typeargtypes);
3857 if (truncatedDiag) {
3858 d.setFlag(DiagnosticFlag.COMPRESSED);
3859 }
3860 return d;
3861 } else {
3862 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
3863 location, site, name, argtypes, typeargtypes);
3864 }
3865 }
3866 //where
3867 private Map<Symbol, JCDiagnostic> mapCandidates() {
3868 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<Symbol, JCDiagnostic>();
3869 for (Candidate c : resolveContext.candidates) {
3870 if (c.isApplicable()) continue;
3871 candidates.put(c.sym, c.details);
3872 }
3873 return candidates;
3874 }
3876 Map<Symbol, JCDiagnostic> filterCandidates(Map<Symbol, JCDiagnostic> candidatesMap) {
3877 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<Symbol, JCDiagnostic>();
3878 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
3879 JCDiagnostic d = _entry.getValue();
3880 if (!new Template(MethodCheckDiag.ARITY_MISMATCH.regex()).matches(d)) {
3881 candidates.put(_entry.getKey(), d);
3882 }
3883 }
3884 return candidates;
3885 }
3887 private List<JCDiagnostic> candidateDetails(Map<Symbol, JCDiagnostic> candidatesMap, Type site) {
3888 List<JCDiagnostic> details = List.nil();
3889 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
3890 Symbol sym = _entry.getKey();
3891 JCDiagnostic detailDiag = diags.fragment("inapplicable.method",
3892 Kinds.kindName(sym),
3893 sym.location(site, types),
3894 sym.asMemberOf(site, types),
3895 _entry.getValue());
3896 details = details.prepend(detailDiag);
3897 }
3898 //typically members are visited in reverse order (see Scope)
3899 //so we need to reverse the candidate list so that candidates
3900 //conform to source order
3901 return details;
3902 }
3903 }
3905 /**
3906 * An InvalidSymbolError error class indicating that a symbol is not
3907 * accessible from a given site
3908 */
3909 class AccessError extends InvalidSymbolError {
3911 private Env<AttrContext> env;
3912 private Type site;
3914 AccessError(Symbol sym) {
3915 this(null, null, sym);
3916 }
3918 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
3919 super(HIDDEN, sym, "access error");
3920 this.env = env;
3921 this.site = site;
3922 if (debugResolve)
3923 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
3924 }
3926 @Override
3927 public boolean exists() {
3928 return false;
3929 }
3931 @Override
3932 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3933 DiagnosticPosition pos,
3934 Symbol location,
3935 Type site,
3936 Name name,
3937 List<Type> argtypes,
3938 List<Type> typeargtypes) {
3939 if (sym.owner.type.hasTag(ERROR))
3940 return null;
3942 if (sym.name == names.init && sym.owner != site.tsym) {
3943 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
3944 pos, location, site, name, argtypes, typeargtypes);
3945 }
3946 else if ((sym.flags() & PUBLIC) != 0
3947 || (env != null && this.site != null
3948 && !isAccessible(env, this.site))) {
3949 return diags.create(dkind, log.currentSource(),
3950 pos, "not.def.access.class.intf.cant.access",
3951 sym, sym.location());
3952 }
3953 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
3954 return diags.create(dkind, log.currentSource(),
3955 pos, "report.access", sym,
3956 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
3957 sym.location());
3958 }
3959 else {
3960 return diags.create(dkind, log.currentSource(),
3961 pos, "not.def.public.cant.access", sym, sym.location());
3962 }
3963 }
3964 }
3966 /**
3967 * InvalidSymbolError error class indicating that an instance member
3968 * has erroneously been accessed from a static context.
3969 */
3970 class StaticError extends InvalidSymbolError {
3972 StaticError(Symbol sym) {
3973 super(STATICERR, sym, "static error");
3974 }
3976 @Override
3977 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3978 DiagnosticPosition pos,
3979 Symbol location,
3980 Type site,
3981 Name name,
3982 List<Type> argtypes,
3983 List<Type> typeargtypes) {
3984 Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
3985 ? types.erasure(sym.type).tsym
3986 : sym);
3987 return diags.create(dkind, log.currentSource(), pos,
3988 "non-static.cant.be.ref", kindName(sym), errSym);
3989 }
3990 }
3992 /**
3993 * InvalidSymbolError error class indicating that a pair of symbols
3994 * (either methods, constructors or operands) are ambiguous
3995 * given an actual arguments/type argument list.
3996 */
3997 class AmbiguityError extends ResolveError {
3999 /** The other maximally specific symbol */
4000 List<Symbol> ambiguousSyms = List.nil();
4002 @Override
4003 public boolean exists() {
4004 return true;
4005 }
4007 AmbiguityError(Symbol sym1, Symbol sym2) {
4008 super(AMBIGUOUS, "ambiguity error");
4009 ambiguousSyms = flatten(sym2).appendList(flatten(sym1));
4010 }
4012 private List<Symbol> flatten(Symbol sym) {
4013 if (sym.kind == AMBIGUOUS) {
4014 return ((AmbiguityError)sym.baseSymbol()).ambiguousSyms;
4015 } else {
4016 return List.of(sym);
4017 }
4018 }
4020 AmbiguityError addAmbiguousSymbol(Symbol s) {
4021 ambiguousSyms = ambiguousSyms.prepend(s);
4022 return this;
4023 }
4025 @Override
4026 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4027 DiagnosticPosition pos,
4028 Symbol location,
4029 Type site,
4030 Name name,
4031 List<Type> argtypes,
4032 List<Type> typeargtypes) {
4033 List<Symbol> diagSyms = ambiguousSyms.reverse();
4034 Symbol s1 = diagSyms.head;
4035 Symbol s2 = diagSyms.tail.head;
4036 Name sname = s1.name;
4037 if (sname == names.init) sname = s1.owner.name;
4038 return diags.create(dkind, log.currentSource(),
4039 pos, "ref.ambiguous", sname,
4040 kindName(s1),
4041 s1,
4042 s1.location(site, types),
4043 kindName(s2),
4044 s2,
4045 s2.location(site, types));
4046 }
4048 /**
4049 * If multiple applicable methods are found during overload and none of them
4050 * is more specific than the others, attempt to merge their signatures.
4051 */
4052 Symbol mergeAbstracts(Type site) {
4053 List<Symbol> ambiguousInOrder = ambiguousSyms.reverse();
4054 for (Symbol s : ambiguousInOrder) {
4055 Type mt = types.memberType(site, s);
4056 boolean found = true;
4057 List<Type> allThrown = mt.getThrownTypes();
4058 for (Symbol s2 : ambiguousInOrder) {
4059 Type mt2 = types.memberType(site, s2);
4060 if ((s2.flags() & ABSTRACT) == 0 ||
4061 !types.overrideEquivalent(mt, mt2) ||
4062 !types.isSameTypes(s.erasure(types).getParameterTypes(),
4063 s2.erasure(types).getParameterTypes())) {
4064 //ambiguity cannot be resolved
4065 return this;
4066 }
4067 Type mst = mostSpecificReturnType(mt, mt2);
4068 if (mst == null || mst != mt) {
4069 found = false;
4070 break;
4071 }
4072 allThrown = chk.intersect(allThrown, mt2.getThrownTypes());
4073 }
4074 if (found) {
4075 //all ambiguous methods were abstract and one method had
4076 //most specific return type then others
4077 return (allThrown == mt.getThrownTypes()) ?
4078 s : new MethodSymbol(
4079 s.flags(),
4080 s.name,
4081 types.createMethodTypeWithThrown(mt, allThrown),
4082 s.owner);
4083 }
4084 }
4085 return this;
4086 }
4088 @Override
4089 protected Symbol access(Name name, TypeSymbol location) {
4090 Symbol firstAmbiguity = ambiguousSyms.last();
4091 return firstAmbiguity.kind == TYP ?
4092 types.createErrorType(name, location, firstAmbiguity.type).tsym :
4093 firstAmbiguity;
4094 }
4095 }
4097 class BadVarargsMethod extends ResolveError {
4099 ResolveError delegatedError;
4101 BadVarargsMethod(ResolveError delegatedError) {
4102 super(delegatedError.kind, "badVarargs");
4103 this.delegatedError = delegatedError;
4104 }
4106 @Override
4107 public Symbol baseSymbol() {
4108 return delegatedError.baseSymbol();
4109 }
4111 @Override
4112 protected Symbol access(Name name, TypeSymbol location) {
4113 return delegatedError.access(name, location);
4114 }
4116 @Override
4117 public boolean exists() {
4118 return true;
4119 }
4121 @Override
4122 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4123 return delegatedError.getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes);
4124 }
4125 }
4127 /**
4128 * Helper class for method resolution diagnostic simplification.
4129 * Certain resolution diagnostic are rewritten as simpler diagnostic
4130 * where the enclosing resolution diagnostic (i.e. 'inapplicable method')
4131 * is stripped away, as it doesn't carry additional info. The logic
4132 * for matching a given diagnostic is given in terms of a template
4133 * hierarchy: a diagnostic template can be specified programmatically,
4134 * so that only certain diagnostics are matched. Each templete is then
4135 * associated with a rewriter object that carries out the task of rewtiting
4136 * the diagnostic to a simpler one.
4137 */
4138 static class MethodResolutionDiagHelper {
4140 /**
4141 * A diagnostic rewriter transforms a method resolution diagnostic
4142 * into a simpler one
4143 */
4144 interface DiagnosticRewriter {
4145 JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4146 DiagnosticPosition preferedPos, DiagnosticSource preferredSource,
4147 DiagnosticType preferredKind, JCDiagnostic d);
4148 }
4150 /**
4151 * A diagnostic template is made up of two ingredients: (i) a regular
4152 * expression for matching a diagnostic key and (ii) a list of sub-templates
4153 * for matching diagnostic arguments.
4154 */
4155 static class Template {
4157 /** regex used to match diag key */
4158 String regex;
4160 /** templates used to match diagnostic args */
4161 Template[] subTemplates;
4163 Template(String key, Template... subTemplates) {
4164 this.regex = key;
4165 this.subTemplates = subTemplates;
4166 }
4168 /**
4169 * Returns true if the regex matches the diagnostic key and if
4170 * all diagnostic arguments are matches by corresponding sub-templates.
4171 */
4172 boolean matches(Object o) {
4173 JCDiagnostic d = (JCDiagnostic)o;
4174 Object[] args = d.getArgs();
4175 if (!d.getCode().matches(regex) ||
4176 subTemplates.length != d.getArgs().length) {
4177 return false;
4178 }
4179 for (int i = 0; i < args.length ; i++) {
4180 if (!subTemplates[i].matches(args[i])) {
4181 return false;
4182 }
4183 }
4184 return true;
4185 }
4186 }
4188 /** a dummy template that match any diagnostic argument */
4189 static final Template skip = new Template("") {
4190 @Override
4191 boolean matches(Object d) {
4192 return true;
4193 }
4194 };
4196 /** rewriter map used for method resolution simplification */
4197 static final Map<Template, DiagnosticRewriter> rewriters =
4198 new LinkedHashMap<Template, DiagnosticRewriter>();
4200 static {
4201 String argMismatchRegex = MethodCheckDiag.ARG_MISMATCH.regex();
4202 rewriters.put(new Template(argMismatchRegex, skip),
4203 new DiagnosticRewriter() {
4204 @Override
4205 public JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4206 DiagnosticPosition preferedPos, DiagnosticSource preferredSource,
4207 DiagnosticType preferredKind, JCDiagnostic d) {
4208 JCDiagnostic cause = (JCDiagnostic)d.getArgs()[0];
4209 return diags.create(preferredKind, preferredSource, d.getDiagnosticPosition(),
4210 "prob.found.req", cause);
4211 }
4212 });
4213 }
4214 }
4216 enum MethodResolutionPhase {
4217 BASIC(false, false),
4218 BOX(true, false),
4219 VARARITY(true, true) {
4220 @Override
4221 public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
4222 switch (sym.kind) {
4223 case WRONG_MTH:
4224 return (bestSoFar.kind == WRONG_MTH || bestSoFar.kind == WRONG_MTHS) ?
4225 bestSoFar :
4226 sym;
4227 case ABSENT_MTH:
4228 return bestSoFar;
4229 default:
4230 return sym;
4231 }
4232 }
4233 };
4235 final boolean isBoxingRequired;
4236 final boolean isVarargsRequired;
4238 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
4239 this.isBoxingRequired = isBoxingRequired;
4240 this.isVarargsRequired = isVarargsRequired;
4241 }
4243 public boolean isBoxingRequired() {
4244 return isBoxingRequired;
4245 }
4247 public boolean isVarargsRequired() {
4248 return isVarargsRequired;
4249 }
4251 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
4252 return (varargsEnabled || !isVarargsRequired) &&
4253 (boxingEnabled || !isBoxingRequired);
4254 }
4256 public Symbol mergeResults(Symbol prev, Symbol sym) {
4257 return sym;
4258 }
4259 }
4261 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
4263 /**
4264 * A resolution context is used to keep track of intermediate results of
4265 * overload resolution, such as list of method that are not applicable
4266 * (used to generate more precise diagnostics) and so on. Resolution contexts
4267 * can be nested - this means that when each overload resolution routine should
4268 * work within the resolution context it created.
4269 */
4270 class MethodResolutionContext {
4272 private List<Candidate> candidates = List.nil();
4274 MethodResolutionPhase step = null;
4276 MethodCheck methodCheck = resolveMethodCheck;
4278 private boolean internalResolution = false;
4279 private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
4281 void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
4282 Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
4283 candidates = candidates.append(c);
4284 }
4286 void addApplicableCandidate(Symbol sym, Type mtype) {
4287 Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
4288 candidates = candidates.append(c);
4289 }
4291 DeferredAttrContext deferredAttrContext(Symbol sym, InferenceContext inferenceContext, ResultInfo pendingResult, Warner warn) {
4292 DeferredAttrContext parent = (pendingResult == null)
4293 ? deferredAttr.emptyDeferredAttrContext
4294 : pendingResult.checkContext.deferredAttrContext();
4295 return deferredAttr.new DeferredAttrContext(attrMode, sym, step,
4296 inferenceContext, parent, warn);
4297 }
4299 /**
4300 * This class represents an overload resolution candidate. There are two
4301 * kinds of candidates: applicable methods and inapplicable methods;
4302 * applicable methods have a pointer to the instantiated method type,
4303 * while inapplicable candidates contain further details about the
4304 * reason why the method has been considered inapplicable.
4305 */
4306 @SuppressWarnings("overrides")
4307 class Candidate {
4309 final MethodResolutionPhase step;
4310 final Symbol sym;
4311 final JCDiagnostic details;
4312 final Type mtype;
4314 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
4315 this.step = step;
4316 this.sym = sym;
4317 this.details = details;
4318 this.mtype = mtype;
4319 }
4321 @Override
4322 public boolean equals(Object o) {
4323 if (o instanceof Candidate) {
4324 Symbol s1 = this.sym;
4325 Symbol s2 = ((Candidate)o).sym;
4326 if ((s1 != s2 &&
4327 (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
4328 (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
4329 ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
4330 return true;
4331 }
4332 return false;
4333 }
4335 boolean isApplicable() {
4336 return mtype != null;
4337 }
4338 }
4340 DeferredAttr.AttrMode attrMode() {
4341 return attrMode;
4342 }
4344 boolean internal() {
4345 return internalResolution;
4346 }
4347 }
4349 MethodResolutionContext currentResolutionContext = null;
4350 }
