1 /*
2 * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package com.sun.tools.javac.comp;
27
28 import com.sun.tools.javac.api.Formattable.LocalizedString;
29 import com.sun.tools.javac.code.*;
30 import com.sun.tools.javac.code.Scope.WriteableScope;
31 import com.sun.tools.javac.code.Source.Feature;
32 import com.sun.tools.javac.code.Symbol.*;
33 import com.sun.tools.javac.code.Type.*;
34 import com.sun.tools.javac.comp.Attr.ResultInfo;
35 import com.sun.tools.javac.comp.Check.CheckContext;
36 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
37 import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
38 import com.sun.tools.javac.comp.DeferredAttr.DeferredType;
39 import com.sun.tools.javac.comp.Resolve.MethodResolutionContext.Candidate;
40 import com.sun.tools.javac.comp.Resolve.MethodResolutionDiagHelper.Template;
41 import com.sun.tools.javac.comp.Resolve.ReferenceLookupResult.StaticKind;
42 import com.sun.tools.javac.jvm.*;
43 import com.sun.tools.javac.main.Option;
44 import com.sun.tools.javac.resources.CompilerProperties.Errors;
45 import com.sun.tools.javac.resources.CompilerProperties.Fragments;
46 import com.sun.tools.javac.resources.CompilerProperties.Warnings;
47 import com.sun.tools.javac.tree.*;
48 import com.sun.tools.javac.tree.JCTree.*;
49 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
50 import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
51 import com.sun.tools.javac.util.*;
52 import com.sun.tools.javac.util.DefinedBy.Api;
53 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
54 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
55 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
56
57 import java.util.Arrays;
58 import java.util.Collection;
59 import java.util.EnumSet;
60 import java.util.HashSet;
61 import java.util.Iterator;
62 import java.util.LinkedHashMap;
63 import java.util.Map;
64 import java.util.Set;
65 import java.util.function.BiFunction;
66 import java.util.function.BiPredicate;
67 import java.util.function.Function;
68 import java.util.function.Predicate;
69 import java.util.function.UnaryOperator;
70 import java.util.stream.Stream;
71 import java.util.stream.StreamSupport;
72
73 import javax.lang.model.element.ElementVisitor;
74
75 import static com.sun.tools.javac.code.Flags.*;
76 import static com.sun.tools.javac.code.Flags.BLOCK;
77 import static com.sun.tools.javac.code.Flags.STATIC;
78 import static com.sun.tools.javac.code.Kinds.*;
79 import static com.sun.tools.javac.code.Kinds.Kind.*;
80 import static com.sun.tools.javac.code.TypeTag.*;
81 import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
82 import static com.sun.tools.javac.tree.JCTree.Tag.*;
83 import static com.sun.tools.javac.util.Iterators.createCompoundIterator;
84
85 /** Helper class for name resolution, used mostly by the attribution phase.
86 *
87 * <p><b>This is NOT part of any supported API.
88 * If you write code that depends on this, you do so at your own risk.
89 * This code and its internal interfaces are subject to change or
90 * deletion without notice.</b>
91 */
92 public class Resolve {
93 protected static final Context.Key<Resolve> resolveKey = new Context.Key<>();
94
95 Names names;
96 Log log;
97 Symtab syms;
98 Attr attr;
99 AttrRecover attrRecover;
100 DeferredAttr deferredAttr;
101 Check chk;
102 Infer infer;
103 ClassFinder finder;
104 ModuleFinder moduleFinder;
105 Types types;
106 JCDiagnostic.Factory diags;
107 public final boolean allowModules;
108 public final boolean allowRecords;
109 public final boolean allowValueClasses;
110 private final boolean compactMethodDiags;
111 private final boolean allowLocalVariableTypeInference;
112 private final boolean allowYieldStatement;
113 final EnumSet<VerboseResolutionMode> verboseResolutionMode;
114 final boolean dumpMethodReferenceSearchResults;
115 final boolean allowPrimitiveClasses;
116
117 WriteableScope polymorphicSignatureScope;
118
119 protected Resolve(Context context) {
120 context.put(resolveKey, this);
121 syms = Symtab.instance(context);
122
123 varNotFound = new SymbolNotFoundError(ABSENT_VAR);
124 methodNotFound = new SymbolNotFoundError(ABSENT_MTH);
125 typeNotFound = new SymbolNotFoundError(ABSENT_TYP);
126 referenceNotFound = ReferenceLookupResult.error(methodNotFound);
127
128 names = Names.instance(context);
129 log = Log.instance(context);
130 attr = Attr.instance(context);
131 attrRecover = AttrRecover.instance(context);
132 deferredAttr = DeferredAttr.instance(context);
133 chk = Check.instance(context);
134 infer = Infer.instance(context);
135 finder = ClassFinder.instance(context);
136 moduleFinder = ModuleFinder.instance(context);
137 types = Types.instance(context);
138 diags = JCDiagnostic.Factory.instance(context);
139 Preview preview = Preview.instance(context);
140 Source source = Source.instance(context);
141 Options options = Options.instance(context);
142 compactMethodDiags = options.isSet(Option.XDIAGS, "compact") ||
143 options.isUnset(Option.XDIAGS) && options.isUnset("rawDiagnostics");
144 verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
145 Target target = Target.instance(context);
146 allowLocalVariableTypeInference = Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source);
147 allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
148 polymorphicSignatureScope = WriteableScope.create(syms.noSymbol);
149 allowModules = Feature.MODULES.allowedInSource(source);
150 allowRecords = Feature.RECORDS.allowedInSource(source);
151 dumpMethodReferenceSearchResults = options.isSet("debug.dumpMethodReferenceSearchResults");
152 allowValueClasses = Feature.VALUE_CLASSES.allowedInSource(source);
153 allowPrimitiveClasses = Feature.PRIMITIVE_CLASSES.allowedInSource(source) && options.isSet("enablePrimitiveClasses");
154 }
155
156 /** error symbols, which are returned when resolution fails
157 */
158 private final SymbolNotFoundError varNotFound;
159 private final SymbolNotFoundError methodNotFound;
160 private final SymbolNotFoundError typeNotFound;
161
162 /** empty reference lookup result */
163 private final ReferenceLookupResult referenceNotFound;
164
165 public static Resolve instance(Context context) {
166 Resolve instance = context.get(resolveKey);
167 if (instance == null)
168 instance = new Resolve(context);
169 return instance;
170 }
171
172 private static Symbol bestOf(Symbol s1,
173 Symbol s2) {
174 return s1.kind.betterThan(s2.kind) ? s1 : s2;
175 }
176
177 // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
178 enum VerboseResolutionMode {
179 SUCCESS("success"),
180 FAILURE("failure"),
181 APPLICABLE("applicable"),
182 INAPPLICABLE("inapplicable"),
183 DEFERRED_INST("deferred-inference"),
184 PREDEF("predef"),
185 OBJECT_INIT("object-init"),
186 INTERNAL("internal");
187
188 final String opt;
189
190 private VerboseResolutionMode(String opt) {
191 this.opt = opt;
192 }
193
194 static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
195 String s = opts.get("debug.verboseResolution");
196 EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
197 if (s == null) return res;
198 if (s.contains("all")) {
199 res = EnumSet.allOf(VerboseResolutionMode.class);
200 }
201 Collection<String> args = Arrays.asList(s.split(","));
202 for (VerboseResolutionMode mode : values()) {
203 if (args.contains(mode.opt)) {
204 res.add(mode);
205 } else if (args.contains("-" + mode.opt)) {
206 res.remove(mode);
207 }
208 }
209 return res;
210 }
211 }
212
213 void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
214 List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
215 boolean success = !bestSoFar.kind.isResolutionError();
216
217 if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
218 return;
219 } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
220 return;
221 }
222
223 if (names.isInitOrVNew(bestSoFar.name) &&
224 bestSoFar.owner == syms.objectType.tsym &&
225 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
226 return; //skip diags for Object constructor resolution
227 } else if (site == syms.predefClass.type &&
228 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
229 return; //skip spurious diags for predef symbols (i.e. operators)
230 } else if (currentResolutionContext.internalResolution &&
231 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
232 return;
233 }
234
235 int pos = 0;
236 int mostSpecificPos = -1;
237 ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
238 for (Candidate c : currentResolutionContext.candidates) {
239 if (currentResolutionContext.step != c.step ||
240 (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
241 (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
242 continue;
243 } else {
244 subDiags.append(c.isApplicable() ?
245 getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
246 getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
247 if (c.sym == bestSoFar)
248 mostSpecificPos = pos;
249 pos++;
250 }
251 }
252 String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
253 List<Type> argtypes2 = argtypes.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
254 JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
255 site.tsym, mostSpecificPos, currentResolutionContext.step,
256 methodArguments(argtypes2),
257 methodArguments(typeargtypes));
258 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
259 log.report(d);
260 }
261
262 JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
263 JCDiagnostic subDiag = null;
264 if (sym.type.hasTag(FORALL)) {
265 subDiag = diags.fragment(Fragments.PartialInstSig(inst));
266 }
267
268 String key = subDiag == null ?
269 "applicable.method.found" :
270 "applicable.method.found.1";
271
272 return diags.fragment(key, pos, sym, subDiag);
273 }
274
275 JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
276 return diags.fragment(Fragments.NotApplicableMethodFound(pos, sym, subDiag));
277 }
278 // </editor-fold>
279
280 /* ************************************************************************
281 * Identifier resolution
282 *************************************************************************/
283
284 /** An environment is "static" if its static level is greater than
285 * the one of its outer environment
286 */
287 protected static boolean isStatic(Env<AttrContext> env) {
288 return env.outer != null && env.info.staticLevel > env.outer.info.staticLevel;
289 }
290
291 /** An environment is an "initializer" if it is a constructor or
292 * an instance initializer.
293 */
294 static boolean isInitializer(Env<AttrContext> env) {
295 Symbol owner = env.info.scope.owner;
296 return owner.isInitOrVNew() ||
297 owner.owner.kind == TYP &&
298 (owner.kind == VAR ||
299 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
300 (owner.flags() & STATIC) == 0;
301 }
302
303 /** Is class accessible in given environment?
304 * @param env The current environment.
305 * @param c The class whose accessibility is checked.
306 */
307 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
308 return isAccessible(env, c, false);
309 }
310
311 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
312
313 /* 15.9.5.1: Note that it is possible for the signature of the anonymous constructor
314 to refer to an inaccessible type
315 */
316 if (env.enclMethod != null && (env.enclMethod.mods.flags & ANONCONSTR) != 0)
317 return true;
318
319 if (env.info.visitingServiceImplementation &&
320 env.toplevel.modle == c.packge().modle) {
321 return true;
322 }
323
324 boolean isAccessible = false;
325 switch ((short)(c.flags() & AccessFlags)) {
326 case PRIVATE:
327 isAccessible =
328 env.enclClass.sym.outermostClass() ==
329 c.owner.outermostClass();
330 break;
331 case 0:
332 isAccessible =
333 env.toplevel.packge == c.owner // fast special case
334 ||
335 env.toplevel.packge == c.packge();
336 break;
337 default: // error recovery
338 isAccessible = true;
339 break;
340 case PUBLIC:
341 if (allowModules) {
342 ModuleSymbol currModule = env.toplevel.modle;
343 currModule.complete();
344 PackageSymbol p = c.packge();
345 isAccessible =
346 currModule == p.modle ||
347 currModule.visiblePackages.get(p.fullname) == p ||
348 p == syms.rootPackage ||
349 (p.modle == syms.unnamedModule && currModule.readModules.contains(p.modle));
350 } else {
351 isAccessible = true;
352 }
353 break;
354 case PROTECTED:
355 isAccessible =
356 env.toplevel.packge == c.owner // fast special case
357 ||
358 env.toplevel.packge == c.packge()
359 ||
360 isInnerSubClass(env.enclClass.sym, c.owner)
361 ||
362 env.info.allowProtectedAccess;
363 break;
364 }
365 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
366 isAccessible :
367 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
368 }
369 //where
370 /** Is given class a subclass of given base class, or an inner class
371 * of a subclass?
372 * Return null if no such class exists.
373 * @param c The class which is the subclass or is contained in it.
374 * @param base The base class
375 */
376 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
377 while (c != null && !c.isSubClass(base, types)) {
378 c = c.owner.enclClass();
379 }
380 return c != null;
381 }
382
383 boolean isAccessible(Env<AttrContext> env, Type t) {
384 return isAccessible(env, t, false);
385 }
386
387 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
388 if (t.hasTag(ARRAY)) {
389 return isAccessible(env, types.cvarUpperBound(types.elemtype(t)));
390 } else if (t.isUnion()) {
391 return StreamSupport.stream(((UnionClassType) t).getAlternativeTypes().spliterator(), false)
392 .allMatch(alternative -> isAccessible(env, alternative.tsym, checkInner));
393 } else {
394 return isAccessible(env, t.tsym, checkInner);
395 }
396 }
397
398 /** Is symbol accessible as a member of given type in given environment?
399 * @param env The current environment.
400 * @param site The type of which the tested symbol is regarded
401 * as a member.
402 * @param sym The symbol.
403 */
404 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
405 return isAccessible(env, site, sym, false);
406 }
407 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
408 if (names.isInitOrVNew(sym.name) && sym.owner != site.tsym) return false;
409
410 /* 15.9.5.1: Note that it is possible for the signature of the anonymous constructor
411 to refer to an inaccessible type
412 */
413 if (env.enclMethod != null && (env.enclMethod.mods.flags & ANONCONSTR) != 0)
414 return true;
415
416 if (env.info.visitingServiceImplementation &&
417 env.toplevel.modle == sym.packge().modle) {
418 return true;
419 }
420
421 ClassSymbol enclosingCsym = env.enclClass.sym;
422 if (allowPrimitiveClasses) {
423 if (sym.kind == MTH || sym.kind == VAR) {
424 /* If any primitive class types are involved, ask the same question in the reference universe,
425 where the hierarchy is navigable
426 */
427 if (site.isPrimitiveClass())
428 site = site.referenceProjection();
429 } else if (sym.kind == TYP) {
430 // A type is accessible in a reference projection if it was
431 // accessible in the value projection.
432 if (site.isReferenceProjection())
433 site = site.valueProjection();
434 }
435 }
436 try {
437 switch ((short)(sym.flags() & AccessFlags)) {
438 case PRIVATE:
439 return
440 (env.enclClass.sym == sym.owner // fast special case
441 ||
442 env.enclClass.sym.outermostClass() ==
443 sym.owner.outermostClass())
444 &&
445 sym.isInheritedIn(site.tsym, types);
446 case 0:
447 return
448 (env.toplevel.packge == sym.owner.owner // fast special case
449 ||
450 env.toplevel.packge == sym.packge())
451 &&
452 isAccessible(env, site, checkInner)
453 &&
454 sym.isInheritedIn(site.tsym, types)
455 &&
456 notOverriddenIn(site, sym);
457 case PROTECTED:
458 return
459 (env.toplevel.packge == sym.owner.owner // fast special case
460 ||
461 env.toplevel.packge == sym.packge()
462 ||
463 isProtectedAccessible(sym, env.enclClass.sym, site)
464 ||
465 // OK to select instance method or field from 'super' or type name
466 // (but type names should be disallowed elsewhere!)
467 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
468 &&
469 isAccessible(env, site, checkInner)
470 &&
471 notOverriddenIn(site, sym);
472 default: // this case includes erroneous combinations as well
473 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
474 }
475 } finally {
476 env.enclClass.sym = enclosingCsym;
477 }
478 }
479 //where
480 /* `sym' is accessible only if not overridden by
481 * another symbol which is a member of `site'
482 * (because, if it is overridden, `sym' is not strictly
483 * speaking a member of `site'). A polymorphic signature method
484 * cannot be overridden (e.g. MH.invokeExact(Object[])).
485 */
486 private boolean notOverriddenIn(Type site, Symbol sym) {
487 if (sym.kind != MTH || sym.isInitOrVNew() || sym.isStatic())
488 return true;
489
490 /* If any primitive class types are involved, ask the same question in the reference universe,
491 where the hierarchy is navigable
492 */
493 if (allowPrimitiveClasses && site.isPrimitiveClass()) {
494 site = site.referenceProjection();
495 }
496
497 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
498 return (s2 == null || s2 == sym || sym.owner == s2.owner || (sym.owner.isInterface() && s2.owner == syms.objectType.tsym) ||
499 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
500 }
501 //where
502 /** Is given protected symbol accessible if it is selected from given site
503 * and the selection takes place in given class?
504 * @param sym The symbol with protected access
505 * @param c The class where the access takes place
506 * @site The type of the qualifier
507 */
508 private
509 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
510 Type newSite = site.hasTag(TYPEVAR) ? site.getUpperBound() : site;
511 while (c != null &&
512 !(c.isSubClass(sym.owner, types) &&
513 (c.flags() & INTERFACE) == 0 &&
514 // In JLS 2e 6.6.2.1, the subclass restriction applies
515 // only to instance fields and methods -- types are excluded
516 // regardless of whether they are declared 'static' or not.
517 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || newSite.tsym.isSubClass(c, types))))
518 c = c.owner.enclClass();
519 return c != null;
520 }
521
522 /**
523 * Performs a recursive scan of a type looking for accessibility problems
524 * from current attribution environment
525 */
526 void checkAccessibleType(Env<AttrContext> env, Type t) {
527 accessibilityChecker.visit(t, env);
528 }
529
530 /**
531 * Accessibility type-visitor
532 */
533 Types.SimpleVisitor<Void, Env<AttrContext>> accessibilityChecker =
534 new Types.SimpleVisitor<Void, Env<AttrContext>>() {
535
536 void visit(List<Type> ts, Env<AttrContext> env) {
537 for (Type t : ts) {
538 visit(t, env);
539 }
540 }
541
542 public Void visitType(Type t, Env<AttrContext> env) {
543 return null;
544 }
545
546 @Override
547 public Void visitArrayType(ArrayType t, Env<AttrContext> env) {
548 visit(t.elemtype, env);
549 return null;
550 }
551
552 @Override
553 public Void visitClassType(ClassType t, Env<AttrContext> env) {
554 visit(t.getTypeArguments(), env);
555 if (!isAccessible(env, t, true)) {
556 accessBase(new AccessError(env, null, t.tsym), env.tree.pos(), env.enclClass.sym, t, t.tsym.name, true);
557 }
558 return null;
559 }
560
561 @Override
562 public Void visitWildcardType(WildcardType t, Env<AttrContext> env) {
563 visit(t.type, env);
564 return null;
565 }
566
567 @Override
568 public Void visitMethodType(MethodType t, Env<AttrContext> env) {
569 visit(t.getParameterTypes(), env);
570 visit(t.getReturnType(), env);
571 visit(t.getThrownTypes(), env);
572 return null;
573 }
574 };
575
576 /** Try to instantiate the type of a method so that it fits
577 * given type arguments and argument types. If successful, return
578 * the method's instantiated type, else return null.
579 * The instantiation will take into account an additional leading
580 * formal parameter if the method is an instance method seen as a member
581 * of an under determined site. In this case, we treat site as an additional
582 * parameter and the parameters of the class containing the method as
583 * additional type variables that get instantiated.
584 *
585 * @param env The current environment
586 * @param site The type of which the method is a member.
587 * @param m The method symbol.
588 * @param argtypes The invocation's given value arguments.
589 * @param typeargtypes The invocation's given type arguments.
590 * @param allowBoxing Allow boxing conversions of arguments.
591 * @param useVarargs Box trailing arguments into an array for varargs.
592 */
593 Type rawInstantiate(Env<AttrContext> env,
594 Type site,
595 Symbol m,
596 ResultInfo resultInfo,
597 List<Type> argtypes,
598 List<Type> typeargtypes,
599 boolean allowBoxing,
600 boolean useVarargs,
601 Warner warn) throws Infer.InferenceException {
602 Type mt = types.memberType(site, m);
603 // tvars is the list of formal type variables for which type arguments
604 // need to inferred.
605 List<Type> tvars = List.nil();
606 if (typeargtypes == null) typeargtypes = List.nil();
607 if (!mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
608 // This is not a polymorphic method, but typeargs are supplied
609 // which is fine, see JLS 15.12.2.1
610 } else if (mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
611 ForAll pmt = (ForAll) mt;
612 if (typeargtypes.length() != pmt.tvars.length())
613 // not enough args
614 throw new InapplicableMethodException(diags.fragment(Fragments.WrongNumberTypeArgs(Integer.toString(pmt.tvars.length()))));
615 // Check type arguments are within bounds
616 List<Type> formals = pmt.tvars;
617 List<Type> actuals = typeargtypes;
618 while (formals.nonEmpty() && actuals.nonEmpty()) {
619 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
620 pmt.tvars, typeargtypes);
621 for (; bounds.nonEmpty(); bounds = bounds.tail) {
622 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn)) {
623 throw new InapplicableMethodException(diags.fragment(Fragments.ExplicitParamDoNotConformToBounds(actuals.head, bounds)));
624 }
625 }
626 formals = formals.tail;
627 actuals = actuals.tail;
628 }
629 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
630 } else if (mt.hasTag(FORALL)) {
631 ForAll pmt = (ForAll) mt;
632 List<Type> tvars1 = types.newInstances(pmt.tvars);
633 tvars = tvars.appendList(tvars1);
634 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
635 }
636
637 // find out whether we need to go the slow route via infer
638 boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
639 for (List<Type> l = argtypes;
640 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
641 l = l.tail) {
642 if (l.head.hasTag(FORALL)) instNeeded = true;
643 }
644
645 if (instNeeded) {
646 return infer.instantiateMethod(env,
647 tvars,
648 (MethodType)mt,
649 resultInfo,
650 (MethodSymbol)m,
651 argtypes,
652 allowBoxing,
653 useVarargs,
654 currentResolutionContext,
655 warn);
656 }
657
658 DeferredAttr.DeferredAttrContext dc = currentResolutionContext.deferredAttrContext(m, infer.emptyContext, resultInfo, warn);
659 currentResolutionContext.methodCheck.argumentsAcceptable(env, dc,
660 argtypes, mt.getParameterTypes(), warn);
661 dc.complete();
662 return mt;
663 }
664
665 Type checkMethod(Env<AttrContext> env,
666 Type site,
667 Symbol m,
668 ResultInfo resultInfo,
669 List<Type> argtypes,
670 List<Type> typeargtypes,
671 Warner warn) {
672 MethodResolutionContext prevContext = currentResolutionContext;
673 try {
674 currentResolutionContext = new MethodResolutionContext();
675 currentResolutionContext.attrMode = (resultInfo.pt == Infer.anyPoly) ?
676 AttrMode.SPECULATIVE : DeferredAttr.AttrMode.CHECK;
677 if (env.tree.hasTag(JCTree.Tag.REFERENCE)) {
678 //method/constructor references need special check class
679 //to handle inference variables in 'argtypes' (might happen
680 //during an unsticking round)
681 currentResolutionContext.methodCheck =
682 new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
683 }
684 MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
685 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
686 step.isBoxingRequired(), step.isVarargsRequired(), warn);
687 }
688 finally {
689 currentResolutionContext = prevContext;
690 }
691 }
692
693 /** Same but returns null instead throwing a NoInstanceException
694 */
695 Type instantiate(Env<AttrContext> env,
696 Type site,
697 Symbol m,
698 ResultInfo resultInfo,
699 List<Type> argtypes,
700 List<Type> typeargtypes,
701 boolean allowBoxing,
702 boolean useVarargs,
703 Warner warn) {
704 try {
705 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
706 allowBoxing, useVarargs, warn);
707 } catch (InapplicableMethodException ex) {
708 return null;
709 }
710 }
711
712 /**
713 * This interface defines an entry point that should be used to perform a
714 * method check. A method check usually consist in determining as to whether
715 * a set of types (actuals) is compatible with another set of types (formals).
716 * Since the notion of compatibility can vary depending on the circumstances,
717 * this interfaces allows to easily add new pluggable method check routines.
718 */
719 interface MethodCheck {
720 /**
721 * Main method check routine. A method check usually consist in determining
722 * as to whether a set of types (actuals) is compatible with another set of
723 * types (formals). If an incompatibility is found, an unchecked exception
724 * is assumed to be thrown.
725 */
726 void argumentsAcceptable(Env<AttrContext> env,
727 DeferredAttrContext deferredAttrContext,
728 List<Type> argtypes,
729 List<Type> formals,
730 Warner warn);
731
732 /**
733 * Retrieve the method check object that will be used during a
734 * most specific check.
735 */
736 MethodCheck mostSpecificCheck(List<Type> actuals);
737 }
738
739 /**
740 * Helper enum defining all method check diagnostics (used by resolveMethodCheck).
741 */
742 enum MethodCheckDiag {
743 /**
744 * Actuals and formals differs in length.
745 */
746 ARITY_MISMATCH("arg.length.mismatch", "infer.arg.length.mismatch"),
747 /**
748 * An actual is incompatible with a formal.
749 */
750 ARG_MISMATCH("no.conforming.assignment.exists", "infer.no.conforming.assignment.exists"),
751 /**
752 * An actual is incompatible with the varargs element type.
753 */
754 VARARG_MISMATCH("varargs.argument.mismatch", "infer.varargs.argument.mismatch"),
755 /**
756 * The varargs element type is inaccessible.
757 */
758 INACCESSIBLE_VARARGS("inaccessible.varargs.type", "inaccessible.varargs.type");
759
760 final String basicKey;
761 final String inferKey;
762
763 MethodCheckDiag(String basicKey, String inferKey) {
764 this.basicKey = basicKey;
765 this.inferKey = inferKey;
766 }
767
768 String regex() {
769 return String.format("([a-z]*\\.)*(%s|%s)", basicKey, inferKey);
770 }
771 }
772
773 /**
774 * Dummy method check object. All methods are deemed applicable, regardless
775 * of their formal parameter types.
776 */
777 MethodCheck nilMethodCheck = new MethodCheck() {
778 public void argumentsAcceptable(Env<AttrContext> env, DeferredAttrContext deferredAttrContext, List<Type> argtypes, List<Type> formals, Warner warn) {
779 //do nothing - method always applicable regardless of actuals
780 }
781
782 public MethodCheck mostSpecificCheck(List<Type> actuals) {
783 return this;
784 }
785 };
786
787 /**
788 * Base class for 'real' method checks. The class defines the logic for
789 * iterating through formals and actuals and provides and entry point
790 * that can be used by subclasses in order to define the actual check logic.
791 */
792 abstract class AbstractMethodCheck implements MethodCheck {
793 @Override
794 public void argumentsAcceptable(final Env<AttrContext> env,
795 DeferredAttrContext deferredAttrContext,
796 List<Type> argtypes,
797 List<Type> formals,
798 Warner warn) {
799 //should we expand formals?
800 boolean useVarargs = deferredAttrContext.phase.isVarargsRequired();
801 JCTree callTree = treeForDiagnostics(env);
802 List<JCExpression> trees = TreeInfo.args(callTree);
803
804 //inference context used during this method check
805 InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
806
807 Type varargsFormal = useVarargs ? formals.last() : null;
808
809 if (varargsFormal == null &&
810 argtypes.size() != formals.size()) {
811 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
812 }
813
814 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
815 DiagnosticPosition pos = trees != null ? trees.head : null;
816 checkArg(pos, false, argtypes.head, formals.head, deferredAttrContext, warn);
817 argtypes = argtypes.tail;
818 formals = formals.tail;
819 trees = trees != null ? trees.tail : trees;
820 }
821
822 if (formals.head != varargsFormal) {
823 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
824 }
825
826 if (useVarargs) {
827 //note: if applicability check is triggered by most specific test,
828 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
829 final Type elt = types.elemtype(varargsFormal);
830 while (argtypes.nonEmpty()) {
831 DiagnosticPosition pos = trees != null ? trees.head : null;
832 checkArg(pos, true, argtypes.head, elt, deferredAttrContext, warn);
833 argtypes = argtypes.tail;
834 trees = trees != null ? trees.tail : trees;
835 }
836 }
837 }
838
839 // where
840 private JCTree treeForDiagnostics(Env<AttrContext> env) {
841 return env.info.preferredTreeForDiagnostics != null ? env.info.preferredTreeForDiagnostics : env.tree;
842 }
843
844 /**
845 * Does the actual argument conforms to the corresponding formal?
846 */
847 abstract void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn);
848
849 protected void reportMC(DiagnosticPosition pos, MethodCheckDiag diag, InferenceContext inferenceContext, Object... args) {
850 boolean inferDiag = inferenceContext != infer.emptyContext;
851 if (inferDiag && (!diag.inferKey.equals(diag.basicKey))) {
852 Object[] args2 = new Object[args.length + 1];
853 System.arraycopy(args, 0, args2, 1, args.length);
854 args2[0] = inferenceContext.inferenceVars();
855 args = args2;
856 }
857 String key = inferDiag ? diag.inferKey : diag.basicKey;
858 throw inferDiag ?
859 infer.error(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args)) :
860 methodCheckFailure.setMessage(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args));
861 }
862
863 /**
864 * To eliminate the overhead associated with allocating an exception object in such an
865 * hot execution path, we use flyweight pattern - and share the same exception instance
866 * across multiple method check failures.
867 */
868 class SharedInapplicableMethodException extends InapplicableMethodException {
869 private static final long serialVersionUID = 0;
870
871 SharedInapplicableMethodException() {
872 super(null);
873 }
874
875 SharedInapplicableMethodException setMessage(JCDiagnostic details) {
876 this.diagnostic = details;
877 return this;
878 }
879 }
880
881 SharedInapplicableMethodException methodCheckFailure = new SharedInapplicableMethodException();
882
883 public MethodCheck mostSpecificCheck(List<Type> actuals) {
884 return nilMethodCheck;
885 }
886
887 }
888
889 /**
890 * Arity-based method check. A method is applicable if the number of actuals
891 * supplied conforms to the method signature.
892 */
893 MethodCheck arityMethodCheck = new AbstractMethodCheck() {
894 @Override
895 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
896 //do nothing - actual always compatible to formals
897 }
898
899 @Override
900 public String toString() {
901 return "arityMethodCheck";
902 }
903 };
904
905 /**
906 * Main method applicability routine. Given a list of actual types A,
907 * a list of formal types F, determines whether the types in A are
908 * compatible (by method invocation conversion) with the types in F.
909 *
910 * Since this routine is shared between overload resolution and method
911 * type-inference, a (possibly empty) inference context is used to convert
912 * formal types to the corresponding 'undet' form ahead of a compatibility
913 * check so that constraints can be propagated and collected.
914 *
915 * Moreover, if one or more types in A is a deferred type, this routine uses
916 * DeferredAttr in order to perform deferred attribution. If one or more actual
917 * deferred types are stuck, they are placed in a queue and revisited later
918 * after the remainder of the arguments have been seen. If this is not sufficient
919 * to 'unstuck' the argument, a cyclic inference error is called out.
920 *
921 * A method check handler (see above) is used in order to report errors.
922 */
923 MethodCheck resolveMethodCheck = new AbstractMethodCheck() {
924
925 @Override
926 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
927 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
928 mresult.check(pos, actual);
929 }
930
931 @Override
932 public void argumentsAcceptable(final Env<AttrContext> env,
933 DeferredAttrContext deferredAttrContext,
934 List<Type> argtypes,
935 List<Type> formals,
936 Warner warn) {
937 super.argumentsAcceptable(env, deferredAttrContext, argtypes, formals, warn);
938 // should we check varargs element type accessibility?
939 if (deferredAttrContext.phase.isVarargsRequired()) {
940 if (deferredAttrContext.mode == AttrMode.CHECK) {
941 varargsAccessible(env, types.elemtype(formals.last()), deferredAttrContext.inferenceContext);
942 }
943 }
944 }
945
946 /**
947 * Test that the runtime array element type corresponding to 't' is accessible. 't' should be the
948 * varargs element type of either the method invocation type signature (after inference completes)
949 * or the method declaration signature (before inference completes).
950 */
951 private void varargsAccessible(final Env<AttrContext> env, final Type t, final InferenceContext inferenceContext) {
952 if (inferenceContext.free(t)) {
953 inferenceContext.addFreeTypeListener(List.of(t),
954 solvedContext -> varargsAccessible(env, solvedContext.asInstType(t), solvedContext));
955 } else {
956 if (!isAccessible(env, types.erasure(t))) {
957 Symbol location = env.enclClass.sym;
958 reportMC(env.tree, MethodCheckDiag.INACCESSIBLE_VARARGS, inferenceContext, t, Kinds.kindName(location), location);
959 }
960 }
961 }
962
963 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
964 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
965 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
966 MethodCheckDiag methodDiag = varargsCheck ?
967 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
968
969 @Override
970 public void report(DiagnosticPosition pos, JCDiagnostic details) {
971 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
972 }
973 };
974 return new MethodResultInfo(to, checkContext);
975 }
976
977 @Override
978 public MethodCheck mostSpecificCheck(List<Type> actuals) {
979 return new MostSpecificCheck(actuals);
980 }
981
982 @Override
983 public String toString() {
984 return "resolveMethodCheck";
985 }
986 };
987
988 /**
989 * This class handles method reference applicability checks; since during
990 * these checks it's sometime possible to have inference variables on
991 * the actual argument types list, the method applicability check must be
992 * extended so that inference variables are 'opened' as needed.
993 */
994 class MethodReferenceCheck extends AbstractMethodCheck {
995
996 InferenceContext pendingInferenceContext;
997
998 MethodReferenceCheck(InferenceContext pendingInferenceContext) {
999 this.pendingInferenceContext = pendingInferenceContext;
1000 }
1001
1002 @Override
1003 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
1004 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
1005 mresult.check(pos, actual);
1006 }
1007
1008 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
1009 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
1010 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
1011 MethodCheckDiag methodDiag = varargsCheck ?
1012 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
1013
1014 @Override
1015 public boolean compatible(Type found, Type req, Warner warn) {
1016 found = pendingInferenceContext.asUndetVar(found);
1017 if (found.hasTag(UNDETVAR) && req.isPrimitive()) {
1018 req = types.boxedClass(req).type;
1019 }
1020 return super.compatible(found, req, warn);
1021 }
1022
1023 @Override
1024 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1025 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
1026 }
1027 };
1028 return new MethodResultInfo(to, checkContext);
1029 }
1030
1031 @Override
1032 public MethodCheck mostSpecificCheck(List<Type> actuals) {
1033 return new MostSpecificCheck(actuals);
1034 }
1035
1036 @Override
1037 public String toString() {
1038 return "MethodReferenceCheck";
1039 }
1040 }
1041
1042 /**
1043 * Check context to be used during method applicability checks. A method check
1044 * context might contain inference variables.
1045 */
1046 abstract class MethodCheckContext implements CheckContext {
1047
1048 boolean strict;
1049 DeferredAttrContext deferredAttrContext;
1050 Warner rsWarner;
1051
1052 public MethodCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
1053 this.strict = strict;
1054 this.deferredAttrContext = deferredAttrContext;
1055 this.rsWarner = rsWarner;
1056 }
1057
1058 public boolean compatible(Type found, Type req, Warner warn) {
1059 InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
1060 return strict ?
1061 types.isSubtypeUnchecked(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn) :
1062 types.isConvertible(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn);
1063 }
1064
1065 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1066 throw new InapplicableMethodException(details);
1067 }
1068
1069 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
1070 return rsWarner;
1071 }
1072
1073 public InferenceContext inferenceContext() {
1074 return deferredAttrContext.inferenceContext;
1075 }
1076
1077 public DeferredAttrContext deferredAttrContext() {
1078 return deferredAttrContext;
1079 }
1080
1081 @Override
1082 public String toString() {
1083 return "MethodCheckContext";
1084 }
1085 }
1086
1087 /**
1088 * ResultInfo class to be used during method applicability checks. Check
1089 * for deferred types goes through special path.
1090 */
1091 class MethodResultInfo extends ResultInfo {
1092
1093 public MethodResultInfo(Type pt, CheckContext checkContext) {
1094 attr.super(KindSelector.VAL, pt, checkContext);
1095 }
1096
1097 @Override
1098 protected Type check(DiagnosticPosition pos, Type found) {
1099 if (found.hasTag(DEFERRED)) {
1100 DeferredType dt = (DeferredType)found;
1101 return dt.check(this);
1102 } else {
1103 Type uResult = U(found);
1104 Type capturedType = pos == null || pos.getTree() == null ?
1105 types.capture(uResult) :
1106 checkContext.inferenceContext()
1107 .cachedCapture(pos.getTree(), uResult, true);
1108 return super.check(pos, chk.checkNonVoid(pos, capturedType));
1109 }
1110 }
1111
1112 /**
1113 * javac has a long-standing 'simplification' (see 6391995):
1114 * given an actual argument type, the method check is performed
1115 * on its upper bound. This leads to inconsistencies when an
1116 * argument type is checked against itself. For example, given
1117 * a type-variable T, it is not true that {@code U(T) <: T},
1118 * so we need to guard against that.
1119 */
1120 private Type U(Type found) {
1121 return found == pt ?
1122 found : types.cvarUpperBound(found);
1123 }
1124
1125 @Override
1126 protected MethodResultInfo dup(Type newPt) {
1127 return new MethodResultInfo(newPt, checkContext);
1128 }
1129
1130 @Override
1131 protected ResultInfo dup(CheckContext newContext) {
1132 return new MethodResultInfo(pt, newContext);
1133 }
1134
1135 @Override
1136 protected ResultInfo dup(Type newPt, CheckContext newContext) {
1137 return new MethodResultInfo(newPt, newContext);
1138 }
1139 }
1140
1141 /**
1142 * Most specific method applicability routine. Given a list of actual types A,
1143 * a list of formal types F1, and a list of formal types F2, the routine determines
1144 * as to whether the types in F1 can be considered more specific than those in F2 w.r.t.
1145 * argument types A.
1146 */
1147 class MostSpecificCheck implements MethodCheck {
1148
1149 List<Type> actuals;
1150
1151 MostSpecificCheck(List<Type> actuals) {
1152 this.actuals = actuals;
1153 }
1154
1155 @Override
1156 public void argumentsAcceptable(final Env<AttrContext> env,
1157 DeferredAttrContext deferredAttrContext,
1158 List<Type> formals1,
1159 List<Type> formals2,
1160 Warner warn) {
1161 formals2 = adjustArgs(formals2, deferredAttrContext.msym, formals1.length(), deferredAttrContext.phase.isVarargsRequired());
1162 while (formals2.nonEmpty()) {
1163 ResultInfo mresult = methodCheckResult(formals2.head, deferredAttrContext, warn, actuals.head);
1164 mresult.check(null, formals1.head);
1165 formals1 = formals1.tail;
1166 formals2 = formals2.tail;
1167 actuals = actuals.isEmpty() ? actuals : actuals.tail;
1168 }
1169 }
1170
1171 /**
1172 * Create a method check context to be used during the most specific applicability check
1173 */
1174 ResultInfo methodCheckResult(Type to, DeferredAttr.DeferredAttrContext deferredAttrContext,
1175 Warner rsWarner, Type actual) {
1176 return attr.new ResultInfo(KindSelector.VAL, to,
1177 new MostSpecificCheckContext(deferredAttrContext, rsWarner, actual));
1178 }
1179
1180 /**
1181 * Subclass of method check context class that implements most specific
1182 * method conversion. If the actual type under analysis is a deferred type
1183 * a full blown structural analysis is carried out.
1184 */
1185 class MostSpecificCheckContext extends MethodCheckContext {
1186
1187 Type actual;
1188
1189 public MostSpecificCheckContext(DeferredAttrContext deferredAttrContext, Warner rsWarner, Type actual) {
1190 super(true, deferredAttrContext, rsWarner);
1191 this.actual = actual;
1192 }
1193
1194 public boolean compatible(Type found, Type req, Warner warn) {
1195 if (unrelatedFunctionalInterfaces(found, req) &&
1196 (actual != null && actual.getTag() == DEFERRED)) {
1197 DeferredType dt = (DeferredType) actual;
1198 JCTree speculativeTree = dt.speculativeTree(deferredAttrContext);
1199 if (speculativeTree != deferredAttr.stuckTree) {
1200 return functionalInterfaceMostSpecific(found, req, speculativeTree);
1201 }
1202 }
1203 return compatibleBySubtyping(found, req);
1204 }
1205
1206 private boolean compatibleBySubtyping(Type found, Type req) {
1207 if (!strict && found.isPrimitive() != req.isPrimitive()) {
1208 found = found.isPrimitive() ? types.boxedClass(found).type : types.unboxedType(found);
1209 }
1210 return types.isSubtypeNoCapture(found, deferredAttrContext.inferenceContext.asUndetVar(req));
1211 }
1212
1213 /** Whether {@code t} and {@code s} are unrelated functional interface types. */
1214 private boolean unrelatedFunctionalInterfaces(Type t, Type s) {
1215 return types.isFunctionalInterface(t.tsym) &&
1216 types.isFunctionalInterface(s.tsym) &&
1217 unrelatedInterfaces(t, s);
1218 }
1219
1220 /** Whether {@code t} and {@code s} are unrelated interface types; recurs on intersections. **/
1221 private boolean unrelatedInterfaces(Type t, Type s) {
1222 if (t.isCompound()) {
1223 for (Type ti : types.interfaces(t)) {
1224 if (!unrelatedInterfaces(ti, s)) {
1225 return false;
1226 }
1227 }
1228 return true;
1229 } else if (s.isCompound()) {
1230 for (Type si : types.interfaces(s)) {
1231 if (!unrelatedInterfaces(t, si)) {
1232 return false;
1233 }
1234 }
1235 return true;
1236 } else {
1237 return types.asSuper(t, s.tsym) == null && types.asSuper(s, t.tsym) == null;
1238 }
1239 }
1240
1241 /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
1242 private boolean functionalInterfaceMostSpecific(Type t, Type s, JCTree tree) {
1243 Type tDesc = types.findDescriptorType(types.capture(t));
1244 Type tDescNoCapture = types.findDescriptorType(t);
1245 Type sDesc = types.findDescriptorType(s);
1246 final List<Type> tTypeParams = tDesc.getTypeArguments();
1247 final List<Type> tTypeParamsNoCapture = tDescNoCapture.getTypeArguments();
1248 final List<Type> sTypeParams = sDesc.getTypeArguments();
1249
1250 // compare type parameters
1251 if (tDesc.hasTag(FORALL) && !types.hasSameBounds((ForAll) tDesc, (ForAll) tDescNoCapture)) {
1252 return false;
1253 }
1254 // can't use Types.hasSameBounds on sDesc because bounds may have ivars
1255 List<Type> tIter = tTypeParams;
1256 List<Type> sIter = sTypeParams;
1257 while (tIter.nonEmpty() && sIter.nonEmpty()) {
1258 Type tBound = tIter.head.getUpperBound();
1259 Type sBound = types.subst(sIter.head.getUpperBound(), sTypeParams, tTypeParams);
1260 if (tBound.containsAny(tTypeParams) && inferenceContext().free(sBound)) {
1261 return false;
1262 }
1263 if (!types.isSameType(tBound, inferenceContext().asUndetVar(sBound))) {
1264 return false;
1265 }
1266 tIter = tIter.tail;
1267 sIter = sIter.tail;
1268 }
1269 if (!tIter.isEmpty() || !sIter.isEmpty()) {
1270 return false;
1271 }
1272
1273 // compare parameters
1274 List<Type> tParams = tDesc.getParameterTypes();
1275 List<Type> tParamsNoCapture = tDescNoCapture.getParameterTypes();
1276 List<Type> sParams = sDesc.getParameterTypes();
1277 while (tParams.nonEmpty() && tParamsNoCapture.nonEmpty() && sParams.nonEmpty()) {
1278 Type tParam = tParams.head;
1279 Type tParamNoCapture = types.subst(tParamsNoCapture.head, tTypeParamsNoCapture, tTypeParams);
1280 Type sParam = types.subst(sParams.head, sTypeParams, tTypeParams);
1281 if (tParam.containsAny(tTypeParams) && inferenceContext().free(sParam)) {
1282 return false;
1283 }
1284 if (!types.isSubtype(inferenceContext().asUndetVar(sParam), tParam)) {
1285 return false;
1286 }
1287 if (!types.isSameType(tParamNoCapture, inferenceContext().asUndetVar(sParam))) {
1288 return false;
1289 }
1290 tParams = tParams.tail;
1291 tParamsNoCapture = tParamsNoCapture.tail;
1292 sParams = sParams.tail;
1293 }
1294 if (!tParams.isEmpty() || !tParamsNoCapture.isEmpty() || !sParams.isEmpty()) {
1295 return false;
1296 }
1297
1298 // compare returns
1299 Type tRet = tDesc.getReturnType();
1300 Type sRet = types.subst(sDesc.getReturnType(), sTypeParams, tTypeParams);
1301 if (tRet.containsAny(tTypeParams) && inferenceContext().free(sRet)) {
1302 return false;
1303 }
1304 MostSpecificFunctionReturnChecker msc = new MostSpecificFunctionReturnChecker(tRet, sRet);
1305 msc.scan(tree);
1306 return msc.result;
1307 }
1308
1309 /**
1310 * Tests whether one functional interface type can be considered more specific
1311 * than another unrelated functional interface type for the scanned expression.
1312 */
1313 class MostSpecificFunctionReturnChecker extends DeferredAttr.PolyScanner {
1314
1315 final Type tRet;
1316 final Type sRet;
1317 boolean result;
1318
1319 /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
1320 MostSpecificFunctionReturnChecker(Type tRet, Type sRet) {
1321 this.tRet = tRet;
1322 this.sRet = sRet;
1323 result = true;
1324 }
1325
1326 @Override
1327 void skip(JCTree tree) {
1328 result = false;
1329 }
1330
1331 @Override
1332 public void visitConditional(JCConditional tree) {
1333 scan(asExpr(tree.truepart));
1334 scan(asExpr(tree.falsepart));
1335 }
1336
1337 @Override
1338 public void visitReference(JCMemberReference tree) {
1339 if (sRet.hasTag(VOID)) {
1340 // do nothing
1341 } else if (tRet.hasTag(VOID)) {
1342 result = false;
1343 } else if (tRet.isPrimitive() != sRet.isPrimitive()) {
1344 boolean retValIsPrimitive =
1345 tree.refPolyKind == PolyKind.STANDALONE &&
1346 tree.sym.type.getReturnType().isPrimitive();
1347 result &= (retValIsPrimitive == tRet.isPrimitive()) &&
1348 (retValIsPrimitive != sRet.isPrimitive());
1349 } else {
1350 result &= compatibleBySubtyping(tRet, sRet);
1351 }
1352 }
1353
1354 @Override
1355 public void visitParens(JCParens tree) {
1356 scan(asExpr(tree.expr));
1357 }
1358
1359 @Override
1360 public void visitLambda(JCLambda tree) {
1361 if (sRet.hasTag(VOID)) {
1362 // do nothing
1363 } else if (tRet.hasTag(VOID)) {
1364 result = false;
1365 } else {
1366 List<JCExpression> lambdaResults = lambdaResults(tree);
1367 if (!lambdaResults.isEmpty() && unrelatedFunctionalInterfaces(tRet, sRet)) {
1368 for (JCExpression expr : lambdaResults) {
1369 result &= functionalInterfaceMostSpecific(tRet, sRet, expr);
1370 }
1371 } else if (!lambdaResults.isEmpty() && tRet.isPrimitive() != sRet.isPrimitive()) {
1372 for (JCExpression expr : lambdaResults) {
1373 boolean retValIsPrimitive = expr.isStandalone() && expr.type.isPrimitive();
1374 result &= (retValIsPrimitive == tRet.isPrimitive()) &&
1375 (retValIsPrimitive != sRet.isPrimitive());
1376 }
1377 } else {
1378 result &= compatibleBySubtyping(tRet, sRet);
1379 }
1380 }
1381 }
1382 //where
1383
1384 private List<JCExpression> lambdaResults(JCLambda lambda) {
1385 if (lambda.getBodyKind() == JCTree.JCLambda.BodyKind.EXPRESSION) {
1386 return List.of(asExpr((JCExpression) lambda.body));
1387 } else {
1388 final ListBuffer<JCExpression> buffer = new ListBuffer<>();
1389 DeferredAttr.LambdaReturnScanner lambdaScanner =
1390 new DeferredAttr.LambdaReturnScanner() {
1391 @Override
1392 public void visitReturn(JCReturn tree) {
1393 if (tree.expr != null) {
1394 buffer.append(asExpr(tree.expr));
1395 }
1396 }
1397 };
1398 lambdaScanner.scan(lambda.body);
1399 return buffer.toList();
1400 }
1401 }
1402
1403 private JCExpression asExpr(JCExpression expr) {
1404 if (expr.type.hasTag(DEFERRED)) {
1405 JCTree speculativeTree = ((DeferredType)expr.type).speculativeTree(deferredAttrContext);
1406 if (speculativeTree != deferredAttr.stuckTree) {
1407 expr = (JCExpression)speculativeTree;
1408 }
1409 }
1410 return expr;
1411 }
1412 }
1413
1414 }
1415
1416 public MethodCheck mostSpecificCheck(List<Type> actuals) {
1417 Assert.error("Cannot get here!");
1418 return null;
1419 }
1420 }
1421
1422 public static class InapplicableMethodException extends RuntimeException {
1423 private static final long serialVersionUID = 0;
1424
1425 transient JCDiagnostic diagnostic;
1426
1427 InapplicableMethodException(JCDiagnostic diag) {
1428 this.diagnostic = diag;
1429 }
1430
1431 public JCDiagnostic getDiagnostic() {
1432 return diagnostic;
1433 }
1434
1435 @Override
1436 public Throwable fillInStackTrace() {
1437 // This is an internal exception; the stack trace is irrelevant.
1438 return this;
1439 }
1440 }
1441
1442 /* ***************************************************************************
1443 * Symbol lookup
1444 * the following naming conventions for arguments are used
1445 *
1446 * env is the environment where the symbol was mentioned
1447 * site is the type of which the symbol is a member
1448 * name is the symbol's name
1449 * if no arguments are given
1450 * argtypes are the value arguments, if we search for a method
1451 *
1452 * If no symbol was found, a ResolveError detailing the problem is returned.
1453 ****************************************************************************/
1454
1455 /** Find field. Synthetic fields are always skipped.
1456 * @param env The current environment.
1457 * @param site The original type from where the selection takes place.
1458 * @param name The name of the field.
1459 * @param c The class to search for the field. This is always
1460 * a superclass or implemented interface of site's class.
1461 */
1462 Symbol findField(Env<AttrContext> env,
1463 Type site,
1464 Name name,
1465 TypeSymbol c) {
1466 while (c.type.hasTag(TYPEVAR))
1467 c = c.type.getUpperBound().tsym;
1468 Symbol bestSoFar = varNotFound;
1469 Symbol sym;
1470 for (Symbol s : c.members().getSymbolsByName(name)) {
1471 if (s.kind == VAR && (s.flags_field & SYNTHETIC) == 0) {
1472 return isAccessible(env, site, s)
1473 ? s : new AccessError(env, site, s);
1474 }
1475 }
1476 Type st = types.supertype(c.type);
1477 if (st != null && (st.hasTag(CLASS) || st.hasTag(TYPEVAR))) {
1478 sym = findField(env, site, name, st.tsym);
1479 bestSoFar = bestOf(bestSoFar, sym);
1480 }
1481 for (List<Type> l = types.interfaces(c.type);
1482 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1483 l = l.tail) {
1484 sym = findField(env, site, name, l.head.tsym);
1485 if (bestSoFar.exists() && sym.exists() &&
1486 sym.owner != bestSoFar.owner)
1487 bestSoFar = new AmbiguityError(bestSoFar, sym);
1488 else
1489 bestSoFar = bestOf(bestSoFar, sym);
1490 }
1491 return bestSoFar;
1492 }
1493
1494 /** Resolve a field identifier, throw a fatal error if not found.
1495 * @param pos The position to use for error reporting.
1496 * @param env The environment current at the method invocation.
1497 * @param site The type of the qualifying expression, in which
1498 * identifier is searched.
1499 * @param name The identifier's name.
1500 */
1501 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
1502 Type site, Name name) {
1503 Symbol sym = findField(env, site, name, site.tsym);
1504 if (sym.kind == VAR) return (VarSymbol)sym;
1505 else throw new FatalError(
1506 diags.fragment(Fragments.FatalErrCantLocateField(name)));
1507 }
1508
1509 /** Find unqualified variable or field with given name.
1510 * Synthetic fields always skipped.
1511 * @param env The current environment.
1512 * @param name The name of the variable or field.
1513 */
1514 Symbol findVar(Env<AttrContext> env, Name name) {
1515 Symbol bestSoFar = varNotFound;
1516 Env<AttrContext> env1 = env;
1517 boolean staticOnly = false;
1518 while (env1.outer != null) {
1519 Symbol sym = null;
1520 for (Symbol s : env1.info.scope.getSymbolsByName(name)) {
1521 if (s.kind == VAR && (s.flags_field & SYNTHETIC) == 0) {
1522 sym = s;
1523 if (staticOnly) {
1524 return new StaticError(sym);
1525 }
1526 break;
1527 }
1528 }
1529 if (isStatic(env1)) staticOnly = true;
1530 if (sym == null) {
1531 sym = findField(env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
1532 }
1533 if (sym.exists()) {
1534 if (staticOnly &&
1535 sym.kind == VAR &&
1536 sym.owner.kind == TYP &&
1537 (sym.flags() & STATIC) == 0)
1538 return new StaticError(sym);
1539 else
1540 return sym;
1541 } else {
1542 bestSoFar = bestOf(bestSoFar, sym);
1543 }
1544
1545 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1546 env1 = env1.outer;
1547 }
1548
1549 Symbol sym = findField(env, syms.predefClass.type, name, syms.predefClass);
1550 if (sym.exists())
1551 return sym;
1552 if (bestSoFar.exists())
1553 return bestSoFar;
1554
1555 Symbol origin = null;
1556 for (Scope sc : new Scope[] { env.toplevel.namedImportScope, env.toplevel.starImportScope }) {
1557 for (Symbol currentSymbol : sc.getSymbolsByName(name)) {
1558 if (currentSymbol.kind != VAR)
1559 continue;
1560 // invariant: sym.kind == Symbol.Kind.VAR
1561 if (!bestSoFar.kind.isResolutionError() &&
1562 currentSymbol.owner != bestSoFar.owner)
1563 return new AmbiguityError(bestSoFar, currentSymbol);
1564 else if (!bestSoFar.kind.betterThan(VAR)) {
1565 origin = sc.getOrigin(currentSymbol).owner;
1566 bestSoFar = isAccessible(env, origin.type, currentSymbol)
1567 ? currentSymbol : new AccessError(env, origin.type, currentSymbol);
1568 }
1569 }
1570 if (bestSoFar.exists()) break;
1571 }
1572 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
1573 return bestSoFar.clone(origin);
1574 else
1575 return bestSoFar;
1576 }
1577
1578 Warner noteWarner = new Warner();
1579
1580 /** Select the best method for a call site among two choices.
1581 * @param env The current environment.
1582 * @param site The original type from where the
1583 * selection takes place.
1584 * @param argtypes The invocation's value arguments,
1585 * @param typeargtypes The invocation's type arguments,
1586 * @param sym Proposed new best match.
1587 * @param bestSoFar Previously found best match.
1588 * @param allowBoxing Allow boxing conversions of arguments.
1589 * @param useVarargs Box trailing arguments into an array for varargs.
1590 */
1591 @SuppressWarnings("fallthrough")
1592 Symbol selectBest(Env<AttrContext> env,
1593 Type site,
1594 List<Type> argtypes,
1595 List<Type> typeargtypes,
1596 Symbol sym,
1597 Symbol bestSoFar,
1598 boolean allowBoxing,
1599 boolean useVarargs) {
1600 if (sym.kind == ERR ||
1601 (site.tsym != sym.owner && !sym.isInheritedIn(site.tsym, types)) ||
1602 !notOverriddenIn(site, sym)) {
1603 return bestSoFar;
1604 } else if (useVarargs && (sym.flags() & VARARGS) == 0) {
1605 return bestSoFar.kind.isResolutionError() ?
1606 new BadVarargsMethod((ResolveError)bestSoFar.baseSymbol()) :
1607 bestSoFar;
1608 }
1609 Assert.check(!sym.kind.isResolutionError());
1610 try {
1611 types.noWarnings.clear();
1612 Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
1613 allowBoxing, useVarargs, types.noWarnings);
1614 currentResolutionContext.addApplicableCandidate(sym, mt);
1615 } catch (InapplicableMethodException ex) {
1616 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
1617 // Currently, an InapplicableMethodException occurs.
1618 // If bestSoFar.kind was ABSENT_MTH, return an InapplicableSymbolError(kind is WRONG_MTH).
1619 // If bestSoFar.kind was HIDDEN(AccessError)/WRONG_MTH/WRONG_MTHS, return an InapplicableSymbolsError(kind is WRONG_MTHS).
1620 // See JDK-8255968 for more information.
1621 switch (bestSoFar.kind) {
1622 case ABSENT_MTH:
1623 return new InapplicableSymbolError(currentResolutionContext);
1624 case HIDDEN:
1625 if (bestSoFar instanceof AccessError accessError) {
1626 // Add the JCDiagnostic of previous AccessError to the currentResolutionContext
1627 // and construct InapplicableSymbolsError.
1628 // Intentionally fallthrough.
1629 currentResolutionContext.addInapplicableCandidate(accessError.sym,
1630 accessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes));
1631 } else {
1632 return bestSoFar;
1633 }
1634 case WRONG_MTH:
1635 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1636 default:
1637 return bestSoFar;
1638 }
1639 }
1640 if (!isAccessible(env, site, sym)) {
1641 AccessError curAccessError = new AccessError(env, site, sym);
1642 JCDiagnostic curDiagnostic = curAccessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes);
1643 // Currently, an AccessError occurs.
1644 // If bestSoFar.kind was ABSENT_MTH, return an AccessError(kind is HIDDEN).
1645 // If bestSoFar.kind was HIDDEN(AccessError), WRONG_MTH, WRONG_MTHS, return an InapplicableSymbolsError(kind is WRONG_MTHS).
1646 // See JDK-8255968 for more information.
1647 if (bestSoFar.kind == ABSENT_MTH) {
1648 bestSoFar = curAccessError;
1649 } else if (bestSoFar.kind == WRONG_MTH) {
1650 // Add the JCDiagnostic of current AccessError to the currentResolutionContext
1651 // and construct InapplicableSymbolsError.
1652 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1653 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1654 } else if (bestSoFar.kind == WRONG_MTHS) {
1655 // Add the JCDiagnostic of current AccessError to the currentResolutionContext
1656 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1657 } else if (bestSoFar.kind == HIDDEN && bestSoFar instanceof AccessError accessError) {
1658 // Add the JCDiagnostics of previous and current AccessError to the currentResolutionContext
1659 // and construct InapplicableSymbolsError.
1660 currentResolutionContext.addInapplicableCandidate(accessError.sym,
1661 accessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes));
1662 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1663 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1664 }
1665 return bestSoFar;
1666 }
1667 return (bestSoFar.kind.isResolutionError() && bestSoFar.kind != AMBIGUOUS)
1668 ? sym
1669 : mostSpecific(argtypes, sym, bestSoFar, env, site, useVarargs);
1670 }
1671
1672 /* Return the most specific of the two methods for a call,
1673 * given that both are accessible and applicable.
1674 * @param m1 A new candidate for most specific.
1675 * @param m2 The previous most specific candidate.
1676 * @param env The current environment.
1677 * @param site The original type from where the selection
1678 * takes place.
1679 * @param allowBoxing Allow boxing conversions of arguments.
1680 * @param useVarargs Box trailing arguments into an array for varargs.
1681 */
1682 Symbol mostSpecific(List<Type> argtypes, Symbol m1,
1683 Symbol m2,
1684 Env<AttrContext> env,
1685 final Type site,
1686 boolean useVarargs) {
1687 switch (m2.kind) {
1688 case MTH:
1689 if (m1 == m2) return m1;
1690 boolean m1SignatureMoreSpecific =
1691 signatureMoreSpecific(argtypes, env, site, m1, m2, useVarargs);
1692 boolean m2SignatureMoreSpecific =
1693 signatureMoreSpecific(argtypes, env, site, m2, m1, useVarargs);
1694 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
1695 Type mt1 = types.memberType(site, m1);
1696 Type mt2 = types.memberType(site, m2);
1697 if (!types.overrideEquivalent(mt1, mt2))
1698 return ambiguityError(m1, m2);
1699
1700 // same signature; select (a) the non-bridge method, or
1701 // (b) the one that overrides the other, or (c) the concrete
1702 // one, or (d) merge both abstract signatures
1703 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
1704 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
1705
1706 if (m1.baseSymbol() == m2.baseSymbol()) {
1707 // this is the same imported symbol which has been cloned twice.
1708 // Return the first one (either will do).
1709 return m1;
1710 }
1711
1712 // if one overrides or hides the other, use it
1713 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
1714 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
1715 // the two owners can never be the same if the target methods are compiled from source,
1716 // but we need to protect against cases where the methods are defined in some classfile
1717 // and make sure we issue an ambiguity error accordingly (by skipping the logic below).
1718 if (m1Owner != m2Owner) {
1719 if (types.asSuper(m1Owner.type.referenceProjectionOrSelf(), m2Owner) != null &&
1720 ((m1.owner.flags_field & INTERFACE) == 0 ||
1721 (m2.owner.flags_field & INTERFACE) != 0) &&
1722 m1.overrides(m2, m1Owner, types, false))
1723 return m1;
1724 if (types.asSuper(m2Owner.type.referenceProjectionOrSelf(), m1Owner) != null &&
1725 ((m2.owner.flags_field & INTERFACE) == 0 ||
1726 (m1.owner.flags_field & INTERFACE) != 0) &&
1727 m2.overrides(m1, m2Owner, types, false))
1728 return m2;
1729 }
1730 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
1731 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
1732 if (m1Abstract && !m2Abstract) return m2;
1733 if (m2Abstract && !m1Abstract) return m1;
1734 // both abstract or both concrete
1735 return ambiguityError(m1, m2);
1736 }
1737 if (m1SignatureMoreSpecific) return m1;
1738 if (m2SignatureMoreSpecific) return m2;
1739 return ambiguityError(m1, m2);
1740 case AMBIGUOUS:
1741 //compare m1 to ambiguous methods in m2
1742 AmbiguityError e = (AmbiguityError)m2.baseSymbol();
1743 boolean m1MoreSpecificThanAnyAmbiguous = true;
1744 boolean allAmbiguousMoreSpecificThanM1 = true;
1745 for (Symbol s : e.ambiguousSyms) {
1746 Symbol moreSpecific = mostSpecific(argtypes, m1, s, env, site, useVarargs);
1747 m1MoreSpecificThanAnyAmbiguous &= moreSpecific == m1;
1748 allAmbiguousMoreSpecificThanM1 &= moreSpecific == s;
1749 }
1750 if (m1MoreSpecificThanAnyAmbiguous)
1751 return m1;
1752 //if m1 is more specific than some ambiguous methods, but other ambiguous methods are
1753 //more specific than m1, add it as a new ambiguous method:
1754 if (!allAmbiguousMoreSpecificThanM1)
1755 e.addAmbiguousSymbol(m1);
1756 return e;
1757 default:
1758 throw new AssertionError();
1759 }
1760 }
1761 //where
1762 private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean useVarargs) {
1763 noteWarner.clear();
1764 int maxLength = Math.max(
1765 Math.max(m1.type.getParameterTypes().length(), actuals.length()),
1766 m2.type.getParameterTypes().length());
1767 MethodResolutionContext prevResolutionContext = currentResolutionContext;
1768 try {
1769 currentResolutionContext = new MethodResolutionContext();
1770 currentResolutionContext.step = prevResolutionContext.step;
1771 currentResolutionContext.methodCheck =
1772 prevResolutionContext.methodCheck.mostSpecificCheck(actuals);
1773 Type mst = instantiate(env, site, m2, null,
1774 adjustArgs(types.cvarLowerBounds(types.memberType(site, m1).getParameterTypes()), m1, maxLength, useVarargs), null,
1775 false, useVarargs, noteWarner);
1776 return mst != null &&
1777 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
1778 } finally {
1779 currentResolutionContext = prevResolutionContext;
1780 }
1781 }
1782
1783 List<Type> adjustArgs(List<Type> args, Symbol msym, int length, boolean allowVarargs) {
1784 if ((msym.flags() & VARARGS) != 0 && allowVarargs) {
1785 Type varargsElem = types.elemtype(args.last());
1786 if (varargsElem == null) {
1787 Assert.error("Bad varargs = " + args.last() + " " + msym);
1788 }
1789 List<Type> newArgs = args.reverse().tail.prepend(varargsElem).reverse();
1790 while (newArgs.length() < length) {
1791 newArgs = newArgs.append(newArgs.last());
1792 }
1793 return newArgs;
1794 } else {
1795 return args;
1796 }
1797 }
1798 //where
1799 Symbol ambiguityError(Symbol m1, Symbol m2) {
1800 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
1801 return (m1.flags() & CLASH) == 0 ? m1 : m2;
1802 } else {
1803 return new AmbiguityError(m1, m2);
1804 }
1805 }
1806
1807 Symbol findMethodInScope(Env<AttrContext> env,
1808 Type site,
1809 Name name,
1810 List<Type> argtypes,
1811 List<Type> typeargtypes,
1812 Scope sc,
1813 Symbol bestSoFar,
1814 boolean allowBoxing,
1815 boolean useVarargs,
1816 boolean abstractok) {
1817 for (Symbol s : sc.getSymbolsByName(name, new LookupFilter(abstractok))) {
1818 bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
1819 bestSoFar, allowBoxing, useVarargs);
1820 }
1821 return bestSoFar;
1822 }
1823 //where
1824 class LookupFilter implements Predicate<Symbol> {
1825
1826 boolean abstractOk;
1827
1828 LookupFilter(boolean abstractOk) {
1829 this.abstractOk = abstractOk;
1830 }
1831
1832 @Override
1833 public boolean test(Symbol s) {
1834 long flags = s.flags();
1835 return s.kind == MTH &&
1836 (flags & SYNTHETIC) == 0 &&
1837 (abstractOk ||
1838 (flags & DEFAULT) != 0 ||
1839 (flags & ABSTRACT) == 0);
1840 }
1841 }
1842
1843 /** Find best qualified method matching given name, type and value
1844 * arguments.
1845 * @param env The current environment.
1846 * @param site The original type from where the selection
1847 * takes place.
1848 * @param name The method's name.
1849 * @param argtypes The method's value arguments.
1850 * @param typeargtypes The method's type arguments
1851 * @param allowBoxing Allow boxing conversions of arguments.
1852 * @param useVarargs Box trailing arguments into an array for varargs.
1853 */
1854 Symbol findMethod(Env<AttrContext> env,
1855 Type site,
1856 Name name,
1857 List<Type> argtypes,
1858 List<Type> typeargtypes,
1859 boolean allowBoxing,
1860 boolean useVarargs) {
1861 Symbol bestSoFar = methodNotFound;
1862 bestSoFar = findMethod(env,
1863 site,
1864 name,
1865 argtypes,
1866 typeargtypes,
1867 site.tsym.type,
1868 bestSoFar,
1869 allowBoxing,
1870 useVarargs);
1871 return bestSoFar;
1872 }
1873 // where
1874 private Symbol findMethod(Env<AttrContext> env,
1875 Type site,
1876 Name name,
1877 List<Type> argtypes,
1878 List<Type> typeargtypes,
1879 Type intype,
1880 Symbol bestSoFar,
1881 boolean allowBoxing,
1882 boolean useVarargs) {
1883 @SuppressWarnings({"unchecked","rawtypes"})
1884 List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
1885
1886 InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
1887 boolean isInterface = site.tsym.isInterface();
1888 for (TypeSymbol s : isInterface ? List.of(intype.tsym) : superclasses(intype)) {
1889 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1890 s.members(), bestSoFar, allowBoxing, useVarargs, true);
1891 if (names.isInitOrVNew(name)) return bestSoFar;
1892 iphase = (iphase == null) ? null : iphase.update(s, this);
1893 if (iphase != null) {
1894 for (Type itype : types.interfaces(s.type)) {
1895 itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
1896 }
1897 }
1898 }
1899
1900 Symbol concrete = bestSoFar.kind.isValid() &&
1901 (bestSoFar.flags() & ABSTRACT) == 0 ?
1902 bestSoFar : methodNotFound;
1903
1904 for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
1905 //keep searching for abstract methods
1906 for (Type itype : itypes[iphase2.ordinal()]) {
1907 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
1908 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
1909 (itype.tsym.flags() & DEFAULT) == 0) continue;
1910 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1911 itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, true);
1912 if (concrete != bestSoFar &&
1913 concrete.kind.isValid() &&
1914 bestSoFar.kind.isValid() &&
1915 types.isSubSignature(concrete.type, bestSoFar.type)) {
1916 //this is an hack - as javac does not do full membership checks
1917 //most specific ends up comparing abstract methods that might have
1918 //been implemented by some concrete method in a subclass and,
1919 //because of raw override, it is possible for an abstract method
1920 //to be more specific than the concrete method - so we need
1921 //to explicitly call that out (see CR 6178365)
1922 bestSoFar = concrete;
1923 }
1924 }
1925 }
1926 if (isInterface && bestSoFar.kind.isResolutionError()) {
1927 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1928 syms.objectType.tsym.members(), bestSoFar, allowBoxing, useVarargs, true);
1929 if (bestSoFar.kind.isValid()) {
1930 Symbol baseSymbol = bestSoFar;
1931 bestSoFar = new MethodSymbol(bestSoFar.flags_field, bestSoFar.name, bestSoFar.type, intype.tsym) {
1932 @Override
1933 public Symbol baseSymbol() {
1934 return baseSymbol;
1935 }
1936 };
1937 }
1938 }
1939 return bestSoFar;
1940 }
1941
1942 enum InterfaceLookupPhase {
1943 ABSTRACT_OK() {
1944 @Override
1945 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1946 //We should not look for abstract methods if receiver is a concrete class
1947 //(as concrete classes are expected to implement all abstracts coming
1948 //from superinterfaces)
1949 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
1950 return this;
1951 } else {
1952 return DEFAULT_OK;
1953 }
1954 }
1955 },
1956 DEFAULT_OK() {
1957 @Override
1958 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1959 return this;
1960 }
1961 };
1962
1963 abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
1964 }
1965
1966 /**
1967 * Return an Iterable object to scan the superclasses of a given type.
1968 * It's crucial that the scan is done lazily, as we don't want to accidentally
1969 * access more supertypes than strictly needed (as this could trigger completion
1970 * errors if some of the not-needed supertypes are missing/ill-formed).
1971 */
1972 Iterable<TypeSymbol> superclasses(final Type intype) {
1973 return () -> new Iterator<TypeSymbol>() {
1974
1975 List<TypeSymbol> seen = List.nil();
1976 TypeSymbol currentSym = symbolFor(intype);
1977 TypeSymbol prevSym = null;
1978
1979 public boolean hasNext() {
1980 if (currentSym == syms.noSymbol) {
1981 currentSym = symbolFor(types.supertype(prevSym.type));
1982 }
1983 return currentSym != null;
1984 }
1985
1986 public TypeSymbol next() {
1987 prevSym = currentSym;
1988 currentSym = syms.noSymbol;
1989 Assert.check(prevSym != null || prevSym != syms.noSymbol);
1990 return prevSym;
1991 }
1992
1993 public void remove() {
1994 throw new UnsupportedOperationException();
1995 }
1996
1997 TypeSymbol symbolFor(Type t) {
1998 if (!t.hasTag(CLASS) &&
1999 !t.hasTag(TYPEVAR)) {
2000 return null;
2001 }
2002 t = types.skipTypeVars(t, false);
2003 if (seen.contains(t.tsym)) {
2004 //degenerate case in which we have a circular
2005 //class hierarchy - because of ill-formed classfiles
2006 return null;
2007 }
2008 seen = seen.prepend(t.tsym);
2009 return t.tsym;
2010 }
2011 };
2012 }
2013
2014 /** Find unqualified method matching given name, type and value arguments.
2015 * @param env The current environment.
2016 * @param name The method's name.
2017 * @param argtypes The method's value arguments.
2018 * @param typeargtypes The method's type arguments.
2019 * @param allowBoxing Allow boxing conversions of arguments.
2020 * @param useVarargs Box trailing arguments into an array for varargs.
2021 */
2022 Symbol findFun(Env<AttrContext> env, Name name,
2023 List<Type> argtypes, List<Type> typeargtypes,
2024 boolean allowBoxing, boolean useVarargs) {
2025 Symbol bestSoFar = methodNotFound;
2026 Env<AttrContext> env1 = env;
2027 boolean staticOnly = false;
2028 while (env1.outer != null) {
2029 if (isStatic(env1)) staticOnly = true;
2030 Assert.check(env1.info.preferredTreeForDiagnostics == null);
2031 env1.info.preferredTreeForDiagnostics = env.tree;
2032 try {
2033 Symbol sym = findMethod(
2034 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
2035 allowBoxing, useVarargs);
2036 if (sym.exists()) {
2037 if (staticOnly &&
2038 sym.kind == MTH &&
2039 sym.owner.kind == TYP &&
2040 (sym.flags() & STATIC) == 0) return new StaticError(sym);
2041 else return sym;
2042 } else {
2043 bestSoFar = bestOf(bestSoFar, sym);
2044 }
2045 } finally {
2046 env1.info.preferredTreeForDiagnostics = null;
2047 }
2048 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
2049 env1 = env1.outer;
2050 }
2051
2052 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
2053 typeargtypes, allowBoxing, useVarargs);
2054 if (sym.exists())
2055 return sym;
2056
2057 for (Symbol currentSym : env.toplevel.namedImportScope.getSymbolsByName(name)) {
2058 Symbol origin = env.toplevel.namedImportScope.getOrigin(currentSym).owner;
2059 if (currentSym.kind == MTH) {
2060 if (currentSym.owner.type != origin.type)
2061 currentSym = currentSym.clone(origin);
2062 if (!isAccessible(env, origin.type, currentSym))
2063 currentSym = new AccessError(env, origin.type, currentSym);
2064 bestSoFar = selectBest(env, origin.type,
2065 argtypes, typeargtypes,
2066 currentSym, bestSoFar,
2067 allowBoxing, useVarargs);
2068 }
2069 }
2070 if (bestSoFar.exists())
2071 return bestSoFar;
2072
2073 for (Symbol currentSym : env.toplevel.starImportScope.getSymbolsByName(name)) {
2074 Symbol origin = env.toplevel.starImportScope.getOrigin(currentSym).owner;
2075 if (currentSym.kind == MTH) {
2076 if (currentSym.owner.type != origin.type)
2077 currentSym = currentSym.clone(origin);
2078 if (!isAccessible(env, origin.type, currentSym))
2079 currentSym = new AccessError(env, origin.type, currentSym);
2080 bestSoFar = selectBest(env, origin.type,
2081 argtypes, typeargtypes,
2082 currentSym, bestSoFar,
2083 allowBoxing, useVarargs);
2084 }
2085 }
2086 return bestSoFar;
2087 }
2088
2089 /** Load toplevel or member class with given fully qualified name and
2090 * verify that it is accessible.
2091 * @param env The current environment.
2092 * @param name The fully qualified name of the class to be loaded.
2093 */
2094 Symbol loadClass(Env<AttrContext> env, Name name, RecoveryLoadClass recoveryLoadClass) {
2095 try {
2096 ClassSymbol c = finder.loadClass(env.toplevel.modle, name);
2097 return isAccessible(env, c) ? c : new AccessError(env, null, c);
2098 } catch (ClassFinder.BadClassFile err) {
2099 return new BadClassFileError(err);
2100 } catch (CompletionFailure ex) {
2101 Symbol candidate = recoveryLoadClass.loadClass(env, name);
2102
2103 if (candidate != null) {
2104 return candidate;
2105 }
2106
2107 return typeNotFound;
2108 }
2109 }
2110
2111 public interface RecoveryLoadClass {
2112 Symbol loadClass(Env<AttrContext> env, Name name);
2113 }
2114
2115 private final RecoveryLoadClass noRecovery = (env, name) -> null;
2116
2117 private final RecoveryLoadClass doRecoveryLoadClass = new RecoveryLoadClass() {
2118 @Override public Symbol loadClass(Env<AttrContext> env, Name name) {
2119 List<Name> candidates = Convert.classCandidates(name);
2120 return lookupInvisibleSymbol(env, name,
2121 n -> () -> createCompoundIterator(candidates,
2122 c -> syms.getClassesForName(c)
2123 .iterator()),
2124 (ms, n) -> {
2125 for (Name candidate : candidates) {
2126 try {
2127 return finder.loadClass(ms, candidate);
2128 } catch (CompletionFailure cf) {
2129 //ignore
2130 }
2131 }
2132 return null;
2133 }, sym -> sym.kind == Kind.TYP, typeNotFound);
2134 }
2135 };
2136
2137 private final RecoveryLoadClass namedImportScopeRecovery = (env, name) -> {
2138 Scope importScope = env.toplevel.namedImportScope;
2139 Symbol existing = importScope.findFirst(Convert.shortName(name),
2140 sym -> sym.kind == TYP && sym.flatName() == name);
2141
2142 if (existing != null) {
2143 return new InvisibleSymbolError(env, true, existing);
2144 }
2145 return null;
2146 };
2147
2148 private final RecoveryLoadClass starImportScopeRecovery = (env, name) -> {
2149 Scope importScope = env.toplevel.starImportScope;
2150 Symbol existing = importScope.findFirst(Convert.shortName(name),
2151 sym -> sym.kind == TYP && sym.flatName() == name);
2152
2153 if (existing != null) {
2154 try {
2155 existing = finder.loadClass(existing.packge().modle, name);
2156
2157 return new InvisibleSymbolError(env, true, existing);
2158 } catch (CompletionFailure cf) {
2159 //ignore
2160 }
2161 }
2162
2163 return null;
2164 };
2165
2166 Symbol lookupPackage(Env<AttrContext> env, Name name) {
2167 PackageSymbol pack = syms.lookupPackage(env.toplevel.modle, name);
2168
2169 if (allowModules && isImportOnDemand(env, name)) {
2170 if (pack.members().isEmpty()) {
2171 return lookupInvisibleSymbol(env, name, syms::getPackagesForName, syms::enterPackage, sym -> {
2172 sym.complete();
2173 return !sym.members().isEmpty();
2174 }, pack);
2175 }
2176 }
2177
2178 return pack;
2179 }
2180
2181 private boolean isImportOnDemand(Env<AttrContext> env, Name name) {
2182 if (!env.tree.hasTag(IMPORT))
2183 return false;
2184
2185 JCTree qualid = ((JCImport) env.tree).qualid;
2186
2187 if (!qualid.hasTag(SELECT))
2188 return false;
2189
2190 if (TreeInfo.name(qualid) != names.asterisk)
2191 return false;
2192
2193 return TreeInfo.fullName(((JCFieldAccess) qualid).selected) == name;
2194 }
2195
2196 private <S extends Symbol> Symbol lookupInvisibleSymbol(Env<AttrContext> env,
2197 Name name,
2198 Function<Name, Iterable<S>> get,
2199 BiFunction<ModuleSymbol, Name, S> load,
2200 Predicate<S> validate,
2201 Symbol defaultResult) {
2202 //even if a class/package cannot be found in the current module and among packages in modules
2203 //it depends on that are exported for any or this module, the class/package may exist internally
2204 //in some of these modules, or may exist in a module on which this module does not depend.
2205 //Provide better diagnostic in such cases by looking for the class in any module:
2206 Iterable<? extends S> candidates = get.apply(name);
2207
2208 for (S sym : candidates) {
2209 if (validate.test(sym))
2210 return createInvisibleSymbolError(env, sym);
2211 }
2212
2213 Set<ModuleSymbol> recoverableModules = new HashSet<>(syms.getAllModules());
2214
2215 recoverableModules.add(syms.unnamedModule);
2216 recoverableModules.remove(env.toplevel.modle);
2217
2218 for (ModuleSymbol ms : recoverableModules) {
2219 //avoid overly eager completing classes from source-based modules, as those
2220 //may not be completable with the current compiler settings:
2221 if (ms.sourceLocation == null) {
2222 if (ms.classLocation == null) {
2223 ms = moduleFinder.findModule(ms);
2224 }
2225
2226 if (ms.kind != ERR) {
2227 S sym = load.apply(ms, name);
2228
2229 if (sym != null && validate.test(sym)) {
2230 return createInvisibleSymbolError(env, sym);
2231 }
2232 }
2233 }
2234 }
2235
2236 return defaultResult;
2237 }
2238
2239 private Symbol createInvisibleSymbolError(Env<AttrContext> env, Symbol sym) {
2240 if (symbolPackageVisible(env, sym)) {
2241 return new AccessError(env, null, sym);
2242 } else {
2243 return new InvisibleSymbolError(env, false, sym);
2244 }
2245 }
2246
2247 private boolean symbolPackageVisible(Env<AttrContext> env, Symbol sym) {
2248 ModuleSymbol envMod = env.toplevel.modle;
2249 PackageSymbol symPack = sym.packge();
2250 return envMod == symPack.modle ||
2251 envMod.visiblePackages.containsKey(symPack.fullname);
2252 }
2253
2254 /**
2255 * Find a type declared in a scope (not inherited). Return null
2256 * if none is found.
2257 * @param env The current environment.
2258 * @param site The original type from where the selection takes
2259 * place.
2260 * @param name The type's name.
2261 * @param c The class to search for the member type. This is
2262 * always a superclass or implemented interface of
2263 * site's class.
2264 */
2265 Symbol findImmediateMemberType(Env<AttrContext> env,
2266 Type site,
2267 Name name,
2268 TypeSymbol c) {
2269 for (Symbol sym : c.members().getSymbolsByName(name)) {
2270 if (sym.kind == TYP) {
2271 return isAccessible(env, site, sym)
2272 ? sym
2273 : new AccessError(env, site, sym);
2274 }
2275 }
2276 return typeNotFound;
2277 }
2278
2279 /** Find a member type inherited from a superclass or interface.
2280 * @param env The current environment.
2281 * @param site The original type from where the selection takes
2282 * place.
2283 * @param name The type's name.
2284 * @param c The class to search for the member type. This is
2285 * always a superclass or implemented interface of
2286 * site's class.
2287 */
2288 Symbol findInheritedMemberType(Env<AttrContext> env,
2289 Type site,
2290 Name name,
2291 TypeSymbol c) {
2292 Symbol bestSoFar = typeNotFound;
2293 Symbol sym;
2294 Type st = types.supertype(c.type);
2295 if (st != null && st.hasTag(CLASS)) {
2296 sym = findMemberType(env, site, name, st.tsym);
2297 bestSoFar = bestOf(bestSoFar, sym);
2298 }
2299 for (List<Type> l = types.interfaces(c.type);
2300 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
2301 l = l.tail) {
2302 sym = findMemberType(env, site, name, l.head.tsym);
2303 if (!bestSoFar.kind.isResolutionError() &&
2304 !sym.kind.isResolutionError() &&
2305 sym.owner != bestSoFar.owner)
2306 bestSoFar = new AmbiguityError(bestSoFar, sym);
2307 else
2308 bestSoFar = bestOf(bestSoFar, sym);
2309 }
2310 return bestSoFar;
2311 }
2312
2313 /** Find qualified member type.
2314 * @param env The current environment.
2315 * @param site The original type from where the selection takes
2316 * place.
2317 * @param name The type's name.
2318 * @param c The class to search for the member type. This is
2319 * always a superclass or implemented interface of
2320 * site's class.
2321 */
2322 Symbol findMemberType(Env<AttrContext> env,
2323 Type site,
2324 Name name,
2325 TypeSymbol c) {
2326 return findMemberTypeInternal(env,site, name, c);
2327 }
2328
2329 /** Find qualified member type.
2330 * @param env The current environment.
2331 * @param site The original type from where the selection takes
2332 * place.
2333 * @param name The type's name.
2334 * @param c The class to search for the member type. This is
2335 * always a superclass or implemented interface of
2336 * site's class.
2337 */
2338 Symbol findMemberTypeInternal(Env<AttrContext> env,
2339 Type site,
2340 Name name,
2341 TypeSymbol c) {
2342 Symbol sym = findImmediateMemberType(env, site, name, c);
2343
2344 if (sym != typeNotFound)
2345 return sym;
2346
2347 return findInheritedMemberType(env, site, name, c);
2348
2349 }
2350
2351 /** Find a global type in given scope and load corresponding class.
2352 * @param env The current environment.
2353 * @param scope The scope in which to look for the type.
2354 * @param name The type's name.
2355 */
2356 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name, RecoveryLoadClass recoveryLoadClass) {
2357 Symbol bestSoFar = typeNotFound;
2358 for (Symbol s : scope.getSymbolsByName(name)) {
2359 Symbol sym = loadClass(env, s.flatName(), recoveryLoadClass);
2360 if (bestSoFar.kind == TYP && sym.kind == TYP &&
2361 bestSoFar != sym)
2362 return new AmbiguityError(bestSoFar, sym);
2363 else
2364 bestSoFar = bestOf(bestSoFar, sym);
2365 }
2366 return bestSoFar;
2367 }
2368
2369 Symbol findTypeVar(Env<AttrContext> env, Name name, boolean staticOnly) {
2370 for (Symbol sym : env.info.scope.getSymbolsByName(name)) {
2371 if (sym.kind == TYP) {
2372 if (sym.type.hasTag(TYPEVAR) &&
2373 (staticOnly || (isStatic(env) && sym.owner.kind == TYP)))
2374 // if staticOnly is set, it means that we have recursed through a static declaration,
2375 // so type variable symbols should not be accessible. If staticOnly is unset, but
2376 // we are in a static declaration (field or method), we should not allow type-variables
2377 // defined in the enclosing class to "leak" into this context.
2378 return new StaticError(sym);
2379 return sym;
2380 }
2381 }
2382 return typeNotFound;
2383 }
2384
2385 /** Find an unqualified type symbol.
2386 * @param env The current environment.
2387 * @param name The type's name.
2388 */
2389 Symbol findType(Env<AttrContext> env, Name name) {
2390 return findTypeInternal(env, name);
2391 }
2392
2393 /** Find an unqualified type symbol.
2394 * @param env The current environment.
2395 * @param name The type's name.
2396 */
2397 Symbol findTypeInternal(Env<AttrContext> env, Name name) {
2398 if (name == names.empty)
2399 return typeNotFound; // do not allow inadvertent "lookup" of anonymous types
2400 Symbol bestSoFar = typeNotFound;
2401 Symbol sym;
2402 boolean staticOnly = false;
2403 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
2404 // First, look for a type variable and the first member type
2405 final Symbol tyvar = findTypeVar(env1, name, staticOnly);
2406 if (isStatic(env1)) staticOnly = true;
2407 sym = findImmediateMemberType(env1, env1.enclClass.sym.type,
2408 name, env1.enclClass.sym);
2409
2410 // Return the type variable if we have it, and have no
2411 // immediate member, OR the type variable is for a method.
2412 if (tyvar != typeNotFound) {
2413 if (env.baseClause || sym == typeNotFound ||
2414 (tyvar.kind == TYP && tyvar.exists() &&
2415 tyvar.owner.kind == MTH)) {
2416 return tyvar;
2417 }
2418 }
2419
2420 // If the environment is a class def, finish up,
2421 // otherwise, do the entire findMemberType
2422 if (sym == typeNotFound)
2423 sym = findInheritedMemberType(env1, env1.enclClass.sym.type,
2424 name, env1.enclClass.sym);
2425
2426 if (staticOnly && sym.kind == TYP &&
2427 sym.type.hasTag(CLASS) &&
2428 sym.type.getEnclosingType().hasTag(CLASS) &&
2429 env1.enclClass.sym.type.isParameterized() &&
2430 sym.type.getEnclosingType().isParameterized())
2431 return new StaticError(sym);
2432 else if (sym.exists()) return sym;
2433 else bestSoFar = bestOf(bestSoFar, sym);
2434
2435 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
2436 if ((encl.sym.flags() & STATIC) != 0)
2437 staticOnly = true;
2438 }
2439
2440 if (!env.tree.hasTag(IMPORT)) {
2441 sym = findGlobalType(env, env.toplevel.namedImportScope, name, namedImportScopeRecovery);
2442 if (sym.exists()) return sym;
2443 else bestSoFar = bestOf(bestSoFar, sym);
2444
2445 sym = findGlobalType(env, env.toplevel.toplevelScope, name, noRecovery);
2446 if (sym.exists()) return sym;
2447 else bestSoFar = bestOf(bestSoFar, sym);
2448
2449 sym = findGlobalType(env, env.toplevel.packge.members(), name, noRecovery);
2450 if (sym.exists()) return sym;
2451 else bestSoFar = bestOf(bestSoFar, sym);
2452
2453 sym = findGlobalType(env, env.toplevel.starImportScope, name, starImportScopeRecovery);
2454 if (sym.exists()) return sym;
2455 else bestSoFar = bestOf(bestSoFar, sym);
2456 }
2457
2458 return bestSoFar;
2459 }
2460
2461 /** Find an unqualified identifier which matches a specified kind set.
2462 * @param pos position on which report warnings, if any;
2463 * null warnings should not be reported
2464 * @param env The current environment.
2465 * @param name The identifier's name.
2466 * @param kind Indicates the possible symbol kinds
2467 * (a subset of VAL, TYP, PCK).
2468 */
2469 Symbol findIdent(DiagnosticPosition pos, Env<AttrContext> env, Name name, KindSelector kind) {
2470 return checkNonExistentType(checkRestrictedType(pos, findIdentInternal(env, name, kind), name));
2471 }
2472
2473 Symbol findIdentInternal(Env<AttrContext> env, Name name, KindSelector kind) {
2474 Symbol bestSoFar = typeNotFound;
2475 Symbol sym;
2476
2477 if (kind.contains(KindSelector.VAL)) {
2478 sym = findVar(env, name);
2479 if (sym.exists()) return sym;
2480 else bestSoFar = bestOf(bestSoFar, sym);
2481 }
2482
2483 if (kind.contains(KindSelector.TYP)) {
2484 sym = findType(env, name);
2485
2486 if (sym.exists()) return sym;
2487 else bestSoFar = bestOf(bestSoFar, sym);
2488 }
2489
2490 if (kind.contains(KindSelector.PCK))
2491 return lookupPackage(env, name);
2492 else return bestSoFar;
2493 }
2494
2495 /** Find an identifier in a package which matches a specified kind set.
2496 * @param pos position on which report warnings, if any;
2497 * null warnings should not be reported
2498 * @param env The current environment.
2499 * @param name The identifier's name.
2500 * @param kind Indicates the possible symbol kinds
2501 * (a nonempty subset of TYP, PCK).
2502 */
2503 Symbol findIdentInPackage(DiagnosticPosition pos,
2504 Env<AttrContext> env, TypeSymbol pck,
2505 Name name, KindSelector kind) {
2506 return checkNonExistentType(checkRestrictedType(pos, findIdentInPackageInternal(env, pck, name, kind), name));
2507 }
2508
2509 Symbol findIdentInPackageInternal(Env<AttrContext> env, TypeSymbol pck,
2510 Name name, KindSelector kind) {
2511 Name fullname = TypeSymbol.formFullName(name, pck);
2512 Symbol bestSoFar = typeNotFound;
2513 if (kind.contains(KindSelector.TYP)) {
2514 RecoveryLoadClass recoveryLoadClass =
2515 allowModules && !kind.contains(KindSelector.PCK) &&
2516 !pck.exists() && !env.info.attributionMode.isSpeculative ?
2517 doRecoveryLoadClass : noRecovery;
2518 Symbol sym = loadClass(env, fullname, recoveryLoadClass);
2519 if (sym.exists()) {
2520 // don't allow programs to use flatnames
2521 if (name == sym.name) return sym;
2522 }
2523 else bestSoFar = bestOf(bestSoFar, sym);
2524 }
2525 if (kind.contains(KindSelector.PCK)) {
2526 return lookupPackage(env, fullname);
2527 }
2528 return bestSoFar;
2529 }
2530
2531 /** Find an identifier among the members of a given type `site'.
2532 * @param pos position on which report warnings, if any;
2533 * null warnings should not be reported
2534 * @param env The current environment.
2535 * @param site The type containing the symbol to be found.
2536 * @param name The identifier's name.
2537 * @param kind Indicates the possible symbol kinds
2538 * (a subset of VAL, TYP).
2539 */
2540 Symbol findIdentInType(DiagnosticPosition pos,
2541 Env<AttrContext> env, Type site,
2542 Name name, KindSelector kind) {
2543 return checkNonExistentType(checkRestrictedType(pos, findIdentInTypeInternal(env, site, name, kind), name));
2544 }
2545
2546 private Symbol checkNonExistentType(Symbol symbol) {
2547 /* Guard against returning a type is not on the class path of the current compilation,
2548 * but *was* on the class path of a separate compilation that produced a class file
2549 * that is on the class path of the current compilation. Such a type will fail completion
2550 * but the completion failure may have been silently swallowed (e.g. missing annotation types)
2551 * with an error stub symbol lingering in the symbol tables.
2552 */
2553 return symbol instanceof ClassSymbol c && c.type.isErroneous() && c.classfile == null ? typeNotFound : symbol;
2554 }
2555
2556 Symbol findIdentInTypeInternal(Env<AttrContext> env, Type site,
2557 Name name, KindSelector kind) {
2558 Symbol bestSoFar = typeNotFound;
2559 Symbol sym;
2560 if (kind.contains(KindSelector.VAL)) {
2561 sym = findField(env, site, name, site.tsym);
2562 if (sym.exists()) return sym;
2563 else bestSoFar = bestOf(bestSoFar, sym);
2564 }
2565
2566 if (kind.contains(KindSelector.TYP)) {
2567 sym = findMemberType(env, site, name, site.tsym);
2568 if (sym.exists()) return sym;
2569 else bestSoFar = bestOf(bestSoFar, sym);
2570 }
2571 return bestSoFar;
2572 }
2573
2574 private Symbol checkRestrictedType(DiagnosticPosition pos, Symbol bestSoFar, Name name) {
2575 if (bestSoFar.kind == TYP || bestSoFar.kind == ABSENT_TYP) {
2576 if (allowLocalVariableTypeInference && name.equals(names.var)) {
2577 bestSoFar = new BadRestrictedTypeError(names.var);
2578 } else if (name.equals(names.yield)) {
2579 if (allowYieldStatement) {
2580 bestSoFar = new BadRestrictedTypeError(names.yield);
2581 } else if (pos != null) {
2582 log.warning(pos, Warnings.IllegalRefToRestrictedType(names.yield));
2583 }
2584 }
2585 }
2586 return bestSoFar;
2587 }
2588
2589 /* ***************************************************************************
2590 * Access checking
2591 * The following methods convert ResolveErrors to ErrorSymbols, issuing
2592 * an error message in the process
2593 ****************************************************************************/
2594
2595 /** If `sym' is a bad symbol: report error and return errSymbol
2596 * else pass through unchanged,
2597 * additional arguments duplicate what has been used in trying to find the
2598 * symbol {@literal (--> flyweight pattern)}. This improves performance since we
2599 * expect misses to happen frequently.
2600 *
2601 * @param sym The symbol that was found, or a ResolveError.
2602 * @param pos The position to use for error reporting.
2603 * @param location The symbol the served as a context for this lookup
2604 * @param site The original type from where the selection took place.
2605 * @param name The symbol's name.
2606 * @param qualified Did we get here through a qualified expression resolution?
2607 * @param argtypes The invocation's value arguments,
2608 * if we looked for a method.
2609 * @param typeargtypes The invocation's type arguments,
2610 * if we looked for a method.
2611 * @param logResolveHelper helper class used to log resolve errors
2612 */
2613 Symbol accessInternal(Symbol sym,
2614 DiagnosticPosition pos,
2615 Symbol location,
2616 Type site,
2617 Name name,
2618 boolean qualified,
2619 List<Type> argtypes,
2620 List<Type> typeargtypes,
2621 LogResolveHelper logResolveHelper) {
2622 if (sym.kind.isResolutionError()) {
2623 ResolveError errSym = (ResolveError)sym.baseSymbol();
2624 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
2625 argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
2626 if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
2627 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
2628 }
2629 }
2630 return sym;
2631 }
2632
2633 /**
2634 * Variant of the generalized access routine, to be used for generating method
2635 * resolution diagnostics
2636 */
2637 Symbol accessMethod(Symbol sym,
2638 DiagnosticPosition pos,
2639 Symbol location,
2640 Type site,
2641 Name name,
2642 boolean qualified,
2643 List<Type> argtypes,
2644 List<Type> typeargtypes) {
2645 return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
2646 }
2647
2648 /** Same as original accessMethod(), but without location.
2649 */
2650 Symbol accessMethod(Symbol sym,
2651 DiagnosticPosition pos,
2652 Type site,
2653 Name name,
2654 boolean qualified,
2655 List<Type> argtypes,
2656 List<Type> typeargtypes) {
2657 return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
2658 }
2659
2660 /**
2661 * Variant of the generalized access routine, to be used for generating variable,
2662 * type resolution diagnostics
2663 */
2664 Symbol accessBase(Symbol sym,
2665 DiagnosticPosition pos,
2666 Symbol location,
2667 Type site,
2668 Name name,
2669 boolean qualified) {
2670 return accessInternal(sym, pos, location, site, name, qualified, List.nil(), null, basicLogResolveHelper);
2671 }
2672
2673 /** Same as original accessBase(), but without location.
2674 */
2675 Symbol accessBase(Symbol sym,
2676 DiagnosticPosition pos,
2677 Type site,
2678 Name name,
2679 boolean qualified) {
2680 return accessBase(sym, pos, site.tsym, site, name, qualified);
2681 }
2682
2683 interface LogResolveHelper {
2684 boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
2685 List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
2686 }
2687
2688 LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
2689 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2690 return !site.isErroneous();
2691 }
2692 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2693 return argtypes;
2694 }
2695 };
2696
2697 LogResolveHelper silentLogResolveHelper = new LogResolveHelper() {
2698 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2699 return false;
2700 }
2701 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2702 return argtypes;
2703 }
2704 };
2705
2706 LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
2707 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2708 return !site.isErroneous() &&
2709 !Type.isErroneous(argtypes) &&
2710 (typeargtypes == null || !Type.isErroneous(typeargtypes));
2711 }
2712 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2713 return argtypes.map(new ResolveDeferredRecoveryMap(AttrMode.SPECULATIVE, accessedSym, currentResolutionContext.step));
2714 }
2715 };
2716
2717 class ResolveDeferredRecoveryMap extends DeferredAttr.RecoveryDeferredTypeMap {
2718
2719 public ResolveDeferredRecoveryMap(AttrMode mode, Symbol msym, MethodResolutionPhase step) {
2720 deferredAttr.super(mode, msym, step);
2721 }
2722
2723 @Override
2724 protected Type typeOf(DeferredType dt, Type pt) {
2725 Type res = super.typeOf(dt, pt);
2726 if (!res.isErroneous()) {
2727 switch (TreeInfo.skipParens(dt.tree).getTag()) {
2728 case LAMBDA:
2729 case REFERENCE:
2730 return dt;
2731 case CONDEXPR:
2732 return res == Type.recoveryType ?
2733 dt : res;
2734 }
2735 }
2736 return res;
2737 }
2738 }
2739
2740 /** Check that sym is not an abstract method.
2741 */
2742 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
2743 if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
2744 log.error(pos,
2745 Errors.AbstractCantBeAccessedDirectly(kindName(sym),sym, sym.location()));
2746 }
2747
2748 /* ***************************************************************************
2749 * Name resolution
2750 * Naming conventions are as for symbol lookup
2751 * Unlike the find... methods these methods will report access errors
2752 ****************************************************************************/
2753
2754 /** Resolve an unqualified (non-method) identifier.
2755 * @param pos The position to use for error reporting.
2756 * @param env The environment current at the identifier use.
2757 * @param name The identifier's name.
2758 * @param kind The set of admissible symbol kinds for the identifier.
2759 */
2760 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
2761 Name name, KindSelector kind) {
2762 return accessBase(
2763 findIdent(pos, env, name, kind),
2764 pos, env.enclClass.sym.type, name, false);
2765 }
2766
2767 /** Resolve an unqualified method identifier.
2768 * @param pos The position to use for error reporting.
2769 * @param env The environment current at the method invocation.
2770 * @param name The identifier's name.
2771 * @param argtypes The types of the invocation's value arguments.
2772 * @param typeargtypes The types of the invocation's type arguments.
2773 */
2774 Symbol resolveMethod(DiagnosticPosition pos,
2775 Env<AttrContext> env,
2776 Name name,
2777 List<Type> argtypes,
2778 List<Type> typeargtypes) {
2779 return lookupMethod(env, pos, env.enclClass.sym, resolveMethodCheck,
2780 new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
2781 @Override
2782 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2783 return findFun(env, name, argtypes, typeargtypes,
2784 phase.isBoxingRequired(),
2785 phase.isVarargsRequired());
2786 }});
2787 }
2788
2789 /** Resolve a qualified method identifier
2790 * @param pos The position to use for error reporting.
2791 * @param env The environment current at the method invocation.
2792 * @param site The type of the qualifying expression, in which
2793 * identifier is searched.
2794 * @param name The identifier's name.
2795 * @param argtypes The types of the invocation's value arguments.
2796 * @param typeargtypes The types of the invocation's type arguments.
2797 */
2798 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2799 Type site, Name name, List<Type> argtypes,
2800 List<Type> typeargtypes) {
2801 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
2802 }
2803 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2804 Symbol location, Type site, Name name, List<Type> argtypes,
2805 List<Type> typeargtypes) {
2806 return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
2807 }
2808 private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
2809 DiagnosticPosition pos, Env<AttrContext> env,
2810 Symbol location, Type site, Name name, List<Type> argtypes,
2811 List<Type> typeargtypes) {
2812 return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
2813 @Override
2814 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2815 return findMethod(env, site, name, argtypes, typeargtypes,
2816 phase.isBoxingRequired(),
2817 phase.isVarargsRequired());
2818 }
2819 @Override
2820 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2821 if (sym.kind.isResolutionError()) {
2822 sym = super.access(env, pos, location, sym);
2823 } else {
2824 MethodSymbol msym = (MethodSymbol)sym;
2825 if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
2826 env.info.pendingResolutionPhase = BASIC;
2827 return findPolymorphicSignatureInstance(env, sym, argtypes);
2828 }
2829 }
2830 return sym;
2831 }
2832 });
2833 }
2834
2835 /** Find or create an implicit method of exactly the given type (after erasure).
2836 * Searches in a side table, not the main scope of the site.
2837 * This emulates the lookup process required by JSR 292 in JVM.
2838 * @param env Attribution environment
2839 * @param spMethod signature polymorphic method - i.e. MH.invokeExact
2840 * @param argtypes The required argument types
2841 */
2842 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
2843 final Symbol spMethod,
2844 List<Type> argtypes) {
2845 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
2846 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
2847 return findPolymorphicSignatureInstance(spMethod, mtype);
2848 }
2849
2850 Symbol findPolymorphicSignatureInstance(final Symbol spMethod,
2851 Type mtype) {
2852 for (Symbol sym : polymorphicSignatureScope.getSymbolsByName(spMethod.name)) {
2853 // Check that there is already a method symbol for the method
2854 // type and owner
2855 if (types.isSameType(mtype, sym.type) &&
2856 spMethod.owner == sym.owner) {
2857 return sym;
2858 }
2859 }
2860
2861 Type spReturnType = spMethod.asType().getReturnType();
2862 if (types.isSameType(spReturnType, syms.objectType)) {
2863 // Polymorphic return, pass through mtype
2864 } else if (!types.isSameType(spReturnType, mtype.getReturnType())) {
2865 // Retain the sig poly method's return type, which differs from that of mtype
2866 // Will result in an incompatible return type error
2867 mtype = new MethodType(mtype.getParameterTypes(),
2868 spReturnType,
2869 mtype.getThrownTypes(),
2870 syms.methodClass);
2871 }
2872
2873 // Create the desired method
2874 // Retain static modifier is to support invocations to
2875 // MethodHandle.linkTo* methods
2876 long flags = ABSTRACT | HYPOTHETICAL |
2877 spMethod.flags() & (Flags.AccessFlags | Flags.STATIC);
2878 Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner) {
2879 @Override
2880 public Symbol baseSymbol() {
2881 return spMethod;
2882 }
2883 };
2884 if (!mtype.isErroneous()) { // Cache only if kosher.
2885 polymorphicSignatureScope.enter(msym);
2886 }
2887 return msym;
2888 }
2889
2890 /** Resolve a qualified method identifier, throw a fatal error if not
2891 * found.
2892 * @param pos The position to use for error reporting.
2893 * @param env The environment current at the method invocation.
2894 * @param site The type of the qualifying expression, in which
2895 * identifier is searched.
2896 * @param name The identifier's name.
2897 * @param argtypes The types of the invocation's value arguments.
2898 * @param typeargtypes The types of the invocation's type arguments.
2899 */
2900 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
2901 Type site, Name name,
2902 List<Type> argtypes,
2903 List<Type> typeargtypes) {
2904 MethodResolutionContext resolveContext = new MethodResolutionContext();
2905 resolveContext.internalResolution = true;
2906 Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
2907 site, name, argtypes, typeargtypes);
2908 if (sym.kind == MTH) return (MethodSymbol)sym;
2909 else throw new FatalError(
2910 diags.fragment(Fragments.FatalErrCantLocateMeth(name)));
2911 }
2912
2913 /** Resolve constructor.
2914 * @param pos The position to use for error reporting.
2915 * @param env The environment current at the constructor invocation.
2916 * @param site The type of class for which a constructor is searched.
2917 * @param argtypes The types of the constructor invocation's value
2918 * arguments.
2919 * @param typeargtypes The types of the constructor invocation's type
2920 * arguments.
2921 */
2922 Symbol resolveConstructor(DiagnosticPosition pos,
2923 Env<AttrContext> env,
2924 Type site,
2925 List<Type> argtypes,
2926 List<Type> typeargtypes) {
2927 return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
2928 }
2929
2930 private Symbol resolveConstructor(MethodResolutionContext resolveContext,
2931 final DiagnosticPosition pos,
2932 Env<AttrContext> env,
2933 Type site,
2934 List<Type> argtypes,
2935 List<Type> typeargtypes) {
2936 Name constructorName = site.tsym.isConcreteValueClass() ? names.vnew : names.init;
2937 return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(constructorName, site, argtypes, typeargtypes) {
2938 @Override
2939 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2940 return findConstructor(pos, env, site, argtypes, typeargtypes,
2941 phase.isBoxingRequired(),
2942 phase.isVarargsRequired());
2943 }
2944 });
2945 }
2946
2947 /** Resolve a constructor, throw a fatal error if not found.
2948 * @param pos The position to use for error reporting.
2949 * @param env The environment current at the method invocation.
2950 * @param site The type to be constructed.
2951 * @param argtypes The types of the invocation's value arguments.
2952 * @param typeargtypes The types of the invocation's type arguments.
2953 */
2954 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2955 Type site,
2956 List<Type> argtypes,
2957 List<Type> typeargtypes) {
2958 MethodResolutionContext resolveContext = new MethodResolutionContext();
2959 resolveContext.internalResolution = true;
2960 Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
2961 if (sym.kind == MTH) return (MethodSymbol)sym;
2962 else throw new FatalError(
2963 diags.fragment(Fragments.FatalErrCantLocateCtor(site)));
2964 }
2965
2966 Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2967 Type site, List<Type> argtypes,
2968 List<Type> typeargtypes,
2969 boolean allowBoxing,
2970 boolean useVarargs) {
2971 Name constructorName = site.tsym.isConcreteValueClass() ? names.vnew : names.init;
2972 Symbol sym = findMethod(env, site,
2973 constructorName, argtypes,
2974 typeargtypes, allowBoxing,
2975 useVarargs);
2976 chk.checkDeprecated(pos, env.info.scope.owner, sym);
2977 chk.checkPreview(pos, env.info.scope.owner, sym);
2978 return sym;
2979 }
2980
2981 /** Resolve constructor using diamond inference.
2982 * @param pos The position to use for error reporting.
2983 * @param env The environment current at the constructor invocation.
2984 * @param site The type of class for which a constructor is searched.
2985 * The scope of this class has been touched in attribution.
2986 * @param argtypes The types of the constructor invocation's value
2987 * arguments.
2988 * @param typeargtypes The types of the constructor invocation's type
2989 * arguments.
2990 */
2991 Symbol resolveDiamond(DiagnosticPosition pos,
2992 Env<AttrContext> env,
2993 Type site,
2994 List<Type> argtypes,
2995 List<Type> typeargtypes) {
2996 Name constructorName = allowValueClasses && site.tsym.isConcreteValueClass() ? names.vnew : names.init;
2997 return lookupMethod(env, pos, site.tsym, resolveMethodCheck,
2998 new BasicLookupHelper(constructorName, site, argtypes, typeargtypes) {
2999 @Override
3000 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3001 return findDiamond(pos, env, site, argtypes, typeargtypes,
3002 phase.isBoxingRequired(),
3003 phase.isVarargsRequired());
3004 }
3005 @Override
3006 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3007 if (sym.kind.isResolutionError()) {
3008 if (sym.kind != WRONG_MTH &&
3009 sym.kind != WRONG_MTHS) {
3010 sym = super.access(env, pos, location, sym);
3011 } else {
3012 sym = new DiamondError(sym, currentResolutionContext);
3013 sym = accessMethod(sym, pos, site, constructorName, true, argtypes, typeargtypes);
3014 env.info.pendingResolutionPhase = currentResolutionContext.step;
3015 }
3016 }
3017 return sym;
3018 }});
3019 }
3020
3021 /** Find the constructor using diamond inference and do some checks(deprecated and preview).
3022 * @param pos The position to use for error reporting.
3023 * @param env The environment current at the constructor invocation.
3024 * @param site The type of class for which a constructor is searched.
3025 * The scope of this class has been touched in attribution.
3026 * @param argtypes The types of the constructor invocation's value arguments.
3027 * @param typeargtypes The types of the constructor invocation's type arguments.
3028 * @param allowBoxing Allow boxing conversions of arguments.
3029 * @param useVarargs Box trailing arguments into an array for varargs.
3030 */
3031 private Symbol findDiamond(DiagnosticPosition pos,
3032 Env<AttrContext> env,
3033 Type site,
3034 List<Type> argtypes,
3035 List<Type> typeargtypes,
3036 boolean allowBoxing,
3037 boolean useVarargs) {
3038 Symbol sym = findDiamond(env, site, argtypes, typeargtypes, allowBoxing, useVarargs);
3039 chk.checkDeprecated(pos, env.info.scope.owner, sym);
3040 chk.checkPreview(pos, env.info.scope.owner, sym);
3041 return sym;
3042 }
3043
3044 /** This method scans all the constructor symbol in a given class scope -
3045 * assuming that the original scope contains a constructor of the kind:
3046 * {@code Foo(X x, Y y)}, where X,Y are class type-variables declared in Foo,
3047 * a method check is executed against the modified constructor type:
3048 * {@code <X,Y>Foo<X,Y>(X x, Y y)}. This is crucial in order to enable diamond
3049 * inference. The inferred return type of the synthetic constructor IS
3050 * the inferred type for the diamond operator.
3051 */
3052 private Symbol findDiamond(Env<AttrContext> env,
3053 Type site,
3054 List<Type> argtypes,
3055 List<Type> typeargtypes,
3056 boolean allowBoxing,
3057 boolean useVarargs) {
3058 Symbol bestSoFar = methodNotFound;
3059 TypeSymbol tsym = site.tsym.isInterface() ? syms.objectType.tsym : site.tsym;
3060 Name constructorName = site.tsym.isConcreteValueClass() ? names.vnew : names.init;
3061 for (final Symbol sym : tsym.members().getSymbolsByName(constructorName)) {
3062 //- System.out.println(" e " + e.sym);
3063 if (sym.kind == MTH &&
3064 (sym.flags_field & SYNTHETIC) == 0) {
3065 List<Type> oldParams = sym.type.hasTag(FORALL) ?
3066 ((ForAll)sym.type).tvars :
3067 List.nil();
3068 Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
3069 types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
3070 MethodSymbol newConstr = new MethodSymbol(sym.flags(), constructorName, constrType, site.tsym) {
3071 @Override
3072 public Symbol baseSymbol() {
3073 return sym;
3074 }
3075 };
3076 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
3077 newConstr,
3078 bestSoFar,
3079 allowBoxing,
3080 useVarargs);
3081 }
3082 }
3083 return bestSoFar;
3084 }
3085
3086 Symbol getMemberReference(DiagnosticPosition pos,
3087 Env<AttrContext> env,
3088 JCMemberReference referenceTree,
3089 Type site,
3090 Name name) {
3091
3092 site = types.capture(site);
3093
3094 ReferenceLookupHelper lookupHelper = makeReferenceLookupHelper(
3095 referenceTree, site, name, List.nil(), null, VARARITY);
3096
3097 Env<AttrContext> newEnv = env.dup(env.tree, env.info.dup());
3098 Symbol sym = lookupMethod(newEnv, env.tree.pos(), site.tsym,
3099 nilMethodCheck, lookupHelper);
3100
3101 env.info.pendingResolutionPhase = newEnv.info.pendingResolutionPhase;
3102
3103 return sym;
3104 }
3105
3106 ReferenceLookupHelper makeReferenceLookupHelper(JCMemberReference referenceTree,
3107 Type site,
3108 Name name,
3109 List<Type> argtypes,
3110 List<Type> typeargtypes,
3111 MethodResolutionPhase maxPhase) {
3112 if (!names.isInitOrVNew(name)) {
3113 //method reference
3114 return new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
3115 } else if (site.hasTag(ARRAY)) {
3116 //array constructor reference
3117 return new ArrayConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
3118 } else {
3119 //class constructor reference
3120 return new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
3121 }
3122 }
3123
3124 /**
3125 * Resolution of member references is typically done as a single
3126 * overload resolution step, where the argument types A are inferred from
3127 * the target functional descriptor.
3128 *
3129 * If the member reference is a method reference with a type qualifier,
3130 * a two-step lookup process is performed. The first step uses the
3131 * expected argument list A, while the second step discards the first
3132 * type from A (which is treated as a receiver type).
3133 *
3134 * There are two cases in which inference is performed: (i) if the member
3135 * reference is a constructor reference and the qualifier type is raw - in
3136 * which case diamond inference is used to infer a parameterization for the
3137 * type qualifier; (ii) if the member reference is an unbound reference
3138 * where the type qualifier is raw - in that case, during the unbound lookup
3139 * the receiver argument type is used to infer an instantiation for the raw
3140 * qualifier type.
3141 *
3142 * When a multi-step resolution process is exploited, the process of picking
3143 * the resulting symbol is delegated to an helper class {@link com.sun.tools.javac.comp.Resolve.ReferenceChooser}.
3144 *
3145 * This routine returns a pair (T,S), where S is the member reference symbol,
3146 * and T is the type of the class in which S is defined. This is necessary as
3147 * the type T might be dynamically inferred (i.e. if constructor reference
3148 * has a raw qualifier).
3149 */
3150 Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(Env<AttrContext> env,
3151 JCMemberReference referenceTree,
3152 Type site,
3153 Name name,
3154 List<Type> argtypes,
3155 List<Type> typeargtypes,
3156 Type descriptor,
3157 MethodCheck methodCheck,
3158 InferenceContext inferenceContext,
3159 ReferenceChooser referenceChooser) {
3160
3161 //step 1 - bound lookup
3162 ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
3163 referenceTree, site, name, argtypes, typeargtypes, VARARITY);
3164 Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
3165 MethodResolutionContext boundSearchResolveContext = new MethodResolutionContext();
3166 boundSearchResolveContext.methodCheck = methodCheck;
3167 Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(),
3168 site.tsym, boundSearchResolveContext, boundLookupHelper);
3169 boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
3170 ReferenceLookupResult boundRes = new ReferenceLookupResult(boundSym, boundSearchResolveContext, isStaticSelector);
3171 if (dumpMethodReferenceSearchResults) {
3172 dumpMethodReferenceSearchResults(referenceTree, boundSearchResolveContext, boundSym, true);
3173 }
3174
3175 //step 2 - unbound lookup
3176 Symbol unboundSym = methodNotFound;
3177 Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
3178 ReferenceLookupHelper unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
3179 ReferenceLookupResult unboundRes = referenceNotFound;
3180 if (unboundLookupHelper != null) {
3181 MethodResolutionContext unboundSearchResolveContext =
3182 new MethodResolutionContext();
3183 unboundSearchResolveContext.methodCheck = methodCheck;
3184 unboundSym = lookupMethod(unboundEnv, env.tree.pos(),
3185 site.tsym, unboundSearchResolveContext, unboundLookupHelper);
3186 unboundRes = new ReferenceLookupResult(unboundSym, unboundSearchResolveContext, isStaticSelector);
3187 if (dumpMethodReferenceSearchResults) {
3188 dumpMethodReferenceSearchResults(referenceTree, unboundSearchResolveContext, unboundSym, false);
3189 }
3190 }
3191
3192 //merge results
3193 Pair<Symbol, ReferenceLookupHelper> res;
3194 ReferenceLookupResult bestRes = referenceChooser.result(boundRes, unboundRes);
3195 res = new Pair<>(bestRes.sym,
3196 bestRes == unboundRes ? unboundLookupHelper : boundLookupHelper);
3197 env.info.pendingResolutionPhase = bestRes == unboundRes ?
3198 unboundEnv.info.pendingResolutionPhase :
3199 boundEnv.info.pendingResolutionPhase;
3200
3201 if (!res.fst.kind.isResolutionError()) {
3202 //handle sigpoly method references
3203 MethodSymbol msym = (MethodSymbol)res.fst;
3204 if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
3205 env.info.pendingResolutionPhase = BASIC;
3206 res = new Pair<>(findPolymorphicSignatureInstance(msym, descriptor), res.snd);
3207 }
3208 }
3209
3210 return res;
3211 }
3212
3213 private void dumpMethodReferenceSearchResults(JCMemberReference referenceTree,
3214 MethodResolutionContext resolutionContext,
3215 Symbol bestSoFar,
3216 boolean bound) {
3217 ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
3218 int pos = 0;
3219 int mostSpecificPos = -1;
3220 for (Candidate c : resolutionContext.candidates) {
3221 if (resolutionContext.step != c.step || !c.isApplicable()) {
3222 continue;
3223 } else {
3224 JCDiagnostic subDiag = null;
3225 if (c.sym.type.hasTag(FORALL)) {
3226 subDiag = diags.fragment(Fragments.PartialInstSig(c.mtype));
3227 }
3228
3229 String key = subDiag == null ?
3230 "applicable.method.found.2" :
3231 "applicable.method.found.3";
3232 subDiags.append(diags.fragment(key, pos,
3233 c.sym.isStatic() ? Fragments.Static : Fragments.NonStatic, c.sym, subDiag));
3234 if (c.sym == bestSoFar)
3235 mostSpecificPos = pos;
3236 pos++;
3237 }
3238 }
3239 JCDiagnostic main = diags.note(
3240 log.currentSource(),
3241 referenceTree,
3242 "method.ref.search.results.multi",
3243 bound ? Fragments.Bound : Fragments.Unbound,
3244 referenceTree.toString(), mostSpecificPos);
3245 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
3246 log.report(d);
3247 }
3248
3249 /**
3250 * This class is used to represent a method reference lookup result. It keeps track of two
3251 * things: (i) the symbol found during a method reference lookup and (ii) the static kind
3252 * of the lookup (see {@link com.sun.tools.javac.comp.Resolve.ReferenceLookupResult.StaticKind}).
3253 */
3254 static class ReferenceLookupResult {
3255
3256 /**
3257 * Static kind associated with a method reference lookup. Erroneous lookups end up with
3258 * the UNDEFINED kind; successful lookups will end up with either STATIC, NON_STATIC,
3259 * depending on whether all applicable candidates are static or non-static methods,
3260 * respectively. If a successful lookup has both static and non-static applicable methods,
3261 * its kind is set to BOTH.
3262 */
3263 enum StaticKind {
3264 STATIC,
3265 NON_STATIC,
3266 BOTH,
3267 UNDEFINED;
3268
3269 /**
3270 * Retrieve the static kind associated with a given (method) symbol.
3271 */
3272 static StaticKind from(Symbol s) {
3273 return s.isStatic() ?
3274 STATIC : NON_STATIC;
3275 }
3276
3277 /**
3278 * Merge two static kinds together.
3279 */
3280 static StaticKind reduce(StaticKind sk1, StaticKind sk2) {
3281 if (sk1 == UNDEFINED) {
3282 return sk2;
3283 } else if (sk2 == UNDEFINED) {
3284 return sk1;
3285 } else {
3286 return sk1 == sk2 ? sk1 : BOTH;
3287 }
3288 }
3289 }
3290
3291 /** The static kind. */
3292 StaticKind staticKind;
3293
3294 /** The lookup result. */
3295 Symbol sym;
3296
3297 ReferenceLookupResult(Symbol sym, MethodResolutionContext resolutionContext, boolean isStaticSelector) {
3298 this(sym, staticKind(sym, resolutionContext, isStaticSelector));
3299 }
3300
3301 private ReferenceLookupResult(Symbol sym, StaticKind staticKind) {
3302 this.staticKind = staticKind;
3303 this.sym = sym;
3304 }
3305
3306 private static StaticKind staticKind(Symbol sym, MethodResolutionContext resolutionContext, boolean isStaticSelector) {
3307 if (sym.kind == MTH && !isStaticSelector) {
3308 return StaticKind.from(sym);
3309 } else if (sym.kind == MTH || sym.kind == AMBIGUOUS) {
3310 return resolutionContext.candidates.stream()
3311 .filter(c -> c.isApplicable() && c.step == resolutionContext.step)
3312 .map(c -> StaticKind.from(c.sym))
3313 .reduce(StaticKind::reduce)
3314 .orElse(StaticKind.UNDEFINED);
3315 } else {
3316 return StaticKind.UNDEFINED;
3317 }
3318 }
3319
3320 /**
3321 * Does this result corresponds to a successful lookup (i.e. one where a method has been found?)
3322 */
3323 boolean isSuccess() {
3324 return staticKind != StaticKind.UNDEFINED;
3325 }
3326
3327 /**
3328 * Does this result have given static kind?
3329 */
3330 boolean hasKind(StaticKind sk) {
3331 return this.staticKind == sk;
3332 }
3333
3334 /**
3335 * Error recovery helper: can this lookup result be ignored (for the purpose of returning
3336 * some 'better' result) ?
3337 */
3338 boolean canIgnore() {
3339 switch (sym.kind) {
3340 case ABSENT_MTH:
3341 return true;
3342 case WRONG_MTH:
3343 InapplicableSymbolError errSym =
3344 (InapplicableSymbolError)sym.baseSymbol();
3345 return new Template(MethodCheckDiag.ARITY_MISMATCH.regex())
3346 .matches(errSym.errCandidate().snd);
3347 case WRONG_MTHS:
3348 InapplicableSymbolsError errSyms =
3349 (InapplicableSymbolsError)sym.baseSymbol();
3350 return errSyms.filterCandidates(errSyms.mapCandidates()).isEmpty();
3351 default:
3352 return false;
3353 }
3354 }
3355
3356 static ReferenceLookupResult error(Symbol sym) {
3357 return new ReferenceLookupResult(sym, StaticKind.UNDEFINED);
3358 }
3359 }
3360
3361 /**
3362 * This abstract class embodies the logic that converts one (bound lookup) or two (unbound lookup)
3363 * {@code ReferenceLookupResult} objects into a (@code Symbol), which is then regarded as the
3364 * result of method reference resolution.
3365 */
3366 abstract class ReferenceChooser {
3367 /**
3368 * Generate a result from a pair of lookup result objects. This method delegates to the
3369 * appropriate result generation routine.
3370 */
3371 ReferenceLookupResult result(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3372 return unboundRes != referenceNotFound ?
3373 unboundResult(boundRes, unboundRes) :
3374 boundResult(boundRes);
3375 }
3376
3377 /**
3378 * Generate a symbol from a given bound lookup result.
3379 */
3380 abstract ReferenceLookupResult boundResult(ReferenceLookupResult boundRes);
3381
3382 /**
3383 * Generate a symbol from a pair of bound/unbound lookup results.
3384 */
3385 abstract ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes);
3386 }
3387
3388 /**
3389 * This chooser implements the selection strategy used during a full lookup; this logic
3390 * is described in JLS SE 8 (15.3.2).
3391 */
3392 ReferenceChooser basicReferenceChooser = new ReferenceChooser() {
3393
3394 @Override
3395 ReferenceLookupResult boundResult(ReferenceLookupResult boundRes) {
3396 return !boundRes.isSuccess() || boundRes.hasKind(StaticKind.NON_STATIC) ?
3397 boundRes : //the search produces a non-static method
3398 ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.sym, false));
3399 }
3400
3401 @Override
3402 ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3403 if (boundRes.isSuccess() && boundRes.sym.isStatic() &&
3404 (!unboundRes.isSuccess() || unboundRes.hasKind(StaticKind.STATIC))) {
3405 //the first search produces a static method and no non-static method is applicable
3406 //during the second search
3407 return boundRes;
3408 } else if (unboundRes.isSuccess() && !unboundRes.sym.isStatic() &&
3409 (!boundRes.isSuccess() || boundRes.hasKind(StaticKind.NON_STATIC))) {
3410 //the second search produces a non-static method and no static method is applicable
3411 //during the first search
3412 return unboundRes;
3413 } else if (boundRes.isSuccess() && unboundRes.isSuccess()) {
3414 //both searches produce some result; ambiguity (error recovery)
3415 return ReferenceLookupResult.error(ambiguityError(boundRes.sym, unboundRes.sym));
3416 } else if (boundRes.isSuccess() || unboundRes.isSuccess()) {
3417 //Both searches failed to produce a result with correct staticness (i.e. first search
3418 //produces an non-static method). Alternatively, a given search produced a result
3419 //with the right staticness, but the other search has applicable methods with wrong
3420 //staticness (error recovery)
3421 return ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.isSuccess() ?
3422 boundRes.sym : unboundRes.sym, true));
3423 } else {
3424 //both searches fail to produce a result - pick 'better' error using heuristics (error recovery)
3425 return (boundRes.canIgnore() && !unboundRes.canIgnore()) ?
3426 unboundRes : boundRes;
3427 }
3428 }
3429 };
3430
3431 /**
3432 * This chooser implements the selection strategy used during an arity-based lookup; this logic
3433 * is described in JLS SE 8 (15.12.2.1).
3434 */
3435 ReferenceChooser structuralReferenceChooser = new ReferenceChooser() {
3436
3437 @Override
3438 ReferenceLookupResult boundResult(ReferenceLookupResult boundRes) {
3439 return (!boundRes.isSuccess() || !boundRes.hasKind(StaticKind.STATIC)) ?
3440 boundRes : //the search has at least one applicable non-static method
3441 ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.sym, false));
3442 }
3443
3444 @Override
3445 ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3446 if (boundRes.isSuccess() && !boundRes.hasKind(StaticKind.NON_STATIC)) {
3447 //the first search has at least one applicable static method
3448 return boundRes;
3449 } else if (unboundRes.isSuccess() && !unboundRes.hasKind(StaticKind.STATIC)) {
3450 //the second search has at least one applicable non-static method
3451 return unboundRes;
3452 } else if (boundRes.isSuccess() || unboundRes.isSuccess()) {
3453 //either the first search produces a non-static method, or second search produces
3454 //a non-static method (error recovery)
3455 return ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.isSuccess() ?
3456 boundRes.sym : unboundRes.sym, true));
3457 } else {
3458 //both searches fail to produce a result - pick 'better' error using heuristics (error recovery)
3459 return (boundRes.canIgnore() && !unboundRes.canIgnore()) ?
3460 unboundRes : boundRes;
3461 }
3462 }
3463 };
3464
3465 /**
3466 * Helper for defining custom method-like lookup logic; a lookup helper
3467 * provides hooks for (i) the actual lookup logic and (ii) accessing the
3468 * lookup result (this step might result in compiler diagnostics to be generated)
3469 */
3470 abstract class LookupHelper {
3471
3472 /** name of the symbol to lookup */
3473 Name name;
3474
3475 /** location in which the lookup takes place */
3476 Type site;
3477
3478 /** actual types used during the lookup */
3479 List<Type> argtypes;
3480
3481 /** type arguments used during the lookup */
3482 List<Type> typeargtypes;
3483
3484 /** Max overload resolution phase handled by this helper */
3485 MethodResolutionPhase maxPhase;
3486
3487 LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3488 this.name = name;
3489 this.site = site;
3490 this.argtypes = argtypes;
3491 this.typeargtypes = typeargtypes;
3492 this.maxPhase = maxPhase;
3493 }
3494
3495 /**
3496 * Should lookup stop at given phase with given result
3497 */
3498 final boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
3499 return phase.ordinal() > maxPhase.ordinal() ||
3500 !sym.kind.isResolutionError() || sym.kind == AMBIGUOUS || sym.kind == STATICERR;
3501 }
3502
3503 /**
3504 * Search for a symbol under a given overload resolution phase - this method
3505 * is usually called several times, once per each overload resolution phase
3506 */
3507 abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
3508
3509 /**
3510 * Dump overload resolution info
3511 */
3512 void debug(DiagnosticPosition pos, Symbol sym) {
3513 //do nothing
3514 }
3515
3516 /**
3517 * Validate the result of the lookup
3518 */
3519 abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
3520 }
3521
3522 abstract class BasicLookupHelper extends LookupHelper {
3523
3524 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
3525 this(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
3526 }
3527
3528 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3529 super(name, site, argtypes, typeargtypes, maxPhase);
3530 }
3531
3532 @Override
3533 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3534 Symbol sym = doLookup(env, phase);
3535 if (sym.kind == AMBIGUOUS) {
3536 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3537 sym = a_err.mergeAbstracts(site);
3538 }
3539 return sym;
3540 }
3541
3542 abstract Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase);
3543
3544 @Override
3545 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3546 if (sym.kind.isResolutionError()) {
3547 //if nothing is found return the 'first' error
3548 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
3549 }
3550 return sym;
3551 }
3552
3553 @Override
3554 void debug(DiagnosticPosition pos, Symbol sym) {
3555 reportVerboseResolutionDiagnostic(pos, name, site, argtypes, typeargtypes, sym);
3556 }
3557 }
3558
3559 /**
3560 * Helper class for member reference lookup. A reference lookup helper
3561 * defines the basic logic for member reference lookup; a method gives
3562 * access to an 'unbound' helper used to perform an unbound member
3563 * reference lookup.
3564 */
3565 abstract class ReferenceLookupHelper extends LookupHelper {
3566
3567 /** The member reference tree */
3568 JCMemberReference referenceTree;
3569
3570 ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3571 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3572 super(name, site, argtypes, typeargtypes, maxPhase);
3573 this.referenceTree = referenceTree;
3574 }
3575
3576 /**
3577 * Returns an unbound version of this lookup helper. By default, this
3578 * method returns an dummy lookup helper.
3579 */
3580 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3581 return null;
3582 }
3583
3584 /**
3585 * Get the kind of the member reference
3586 */
3587 abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
3588
3589 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3590 if (sym.kind == AMBIGUOUS) {
3591 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3592 sym = a_err.mergeAbstracts(site);
3593 }
3594 //skip error reporting
3595 return sym;
3596 }
3597 }
3598
3599 /**
3600 * Helper class for method reference lookup. The lookup logic is based
3601 * upon Resolve.findMethod; in certain cases, this helper class has a
3602 * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
3603 * In such cases, non-static lookup results are thrown away.
3604 */
3605 class MethodReferenceLookupHelper extends ReferenceLookupHelper {
3606
3607 /** The original method reference lookup site. */
3608 Type originalSite;
3609
3610 MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3611 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3612 super(referenceTree, name, types.skipTypeVars(site, true), argtypes, typeargtypes, maxPhase);
3613 this.originalSite = site;
3614 }
3615
3616 @Override
3617 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3618 return findMethod(env, site, name, argtypes, typeargtypes,
3619 phase.isBoxingRequired(), phase.isVarargsRequired());
3620 }
3621
3622 @Override
3623 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3624 if (TreeInfo.isStaticSelector(referenceTree.expr, names)) {
3625 if (argtypes.nonEmpty() &&
3626 (argtypes.head.hasTag(NONE) ||
3627 types.isSubtypeUnchecked(inferenceContext.asUndetVar(argtypes.head.referenceProjectionOrSelf()), originalSite))) {
3628 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
3629 originalSite, argtypes, typeargtypes, maxPhase);
3630 } else {
3631 return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
3632 @Override
3633 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3634 return this;
3635 }
3636
3637 @Override
3638 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3639 return methodNotFound;
3640 }
3641
3642 @Override
3643 ReferenceKind referenceKind(Symbol sym) {
3644 Assert.error();
3645 return null;
3646 }
3647 };
3648 }
3649 } else {
3650 return super.unboundLookup(inferenceContext);
3651 }
3652 }
3653
3654 @Override
3655 ReferenceKind referenceKind(Symbol sym) {
3656 if (sym.isStatic()) {
3657 return ReferenceKind.STATIC;
3658 } else {
3659 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
3660 return selName != null && selName == names._super ?
3661 ReferenceKind.SUPER :
3662 ReferenceKind.BOUND;
3663 }
3664 }
3665 }
3666
3667 /**
3668 * Helper class for unbound method reference lookup. Essentially the same
3669 * as the basic method reference lookup helper; main difference is that static
3670 * lookup results are thrown away. If qualifier type is raw, an attempt to
3671 * infer a parameterized type is made using the first actual argument (that
3672 * would otherwise be ignored during the lookup).
3673 */
3674 class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
3675
3676 UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3677 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3678 super(referenceTree, name, site, argtypes.tail, typeargtypes, maxPhase);
3679 if (site.isRaw() && !argtypes.head.hasTag(NONE)) {
3680 Type asSuperSite = types.asSuper(argtypes.head.referenceProjectionOrSelf(), site.tsym);
3681 this.site = types.skipTypeVars(asSuperSite, true);
3682 }
3683 }
3684
3685 @Override
3686 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3687 return this;
3688 }
3689
3690 @Override
3691 ReferenceKind referenceKind(Symbol sym) {
3692 return ReferenceKind.UNBOUND;
3693 }
3694 }
3695
3696 /**
3697 * Helper class for array constructor lookup; an array constructor lookup
3698 * is simulated by looking up a method that returns the array type specified
3699 * as qualifier, and that accepts a single int parameter (size of the array).
3700 */
3701 class ArrayConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3702
3703 ArrayConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3704 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3705 // TODO - array constructor will be <init>
3706 super(referenceTree, site.tsym.isConcreteValueClass() ? names.vnew : names.init, site, argtypes, typeargtypes, maxPhase);
3707 }
3708
3709 @Override
3710 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3711 WriteableScope sc = WriteableScope.create(syms.arrayClass);
3712 MethodSymbol arrayConstr = new MethodSymbol(PUBLIC, name, null, site.tsym);
3713 arrayConstr.type = new MethodType(List.of(syms.intType), site, List.nil(), syms.methodClass);
3714 sc.enter(arrayConstr);
3715 return findMethodInScope(env, site, name, argtypes, typeargtypes, sc, methodNotFound, phase.isBoxingRequired(), phase.isVarargsRequired(), false);
3716 }
3717
3718 @Override
3719 ReferenceKind referenceKind(Symbol sym) {
3720 return ReferenceKind.ARRAY_CTOR;
3721 }
3722 }
3723
3724 /**
3725 * Helper class for constructor reference lookup. The lookup logic is based
3726 * upon either Resolve.findMethod or Resolve.findDiamond - depending on
3727 * whether the constructor reference needs diamond inference (this is the case
3728 * if the qualifier type is raw). A special erroneous symbol is returned
3729 * if the lookup returns the constructor of an inner class and there's no
3730 * enclosing instance in scope.
3731 */
3732 class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3733
3734 boolean needsInference;
3735
3736 ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3737 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3738 super(referenceTree, site.tsym.isConcreteValueClass() ? names.vnew : names.init, site, argtypes, typeargtypes, maxPhase);
3739 if (site.isRaw()) {
3740 this.site = new ClassType(site.getEnclosingType(),
3741 !(site.tsym.isInner() && site.getEnclosingType().isRaw()) ?
3742 site.tsym.type.getTypeArguments() : List.nil(), site.tsym, site.getMetadata(), site.getFlavor());
3743 needsInference = true;
3744 }
3745 }
3746
3747 @Override
3748 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3749 Symbol sym = needsInference ?
3750 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
3751 findMethod(env, site, name, argtypes, typeargtypes,
3752 phase.isBoxingRequired(), phase.isVarargsRequired());
3753 return enclosingInstanceMissing(env, site) ? new BadConstructorReferenceError(sym) : sym;
3754 }
3755
3756 @Override
3757 ReferenceKind referenceKind(Symbol sym) {
3758 return site.getEnclosingType().hasTag(NONE) ?
3759 ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
3760 }
3761 }
3762
3763 /**
3764 * Main overload resolution routine. On each overload resolution step, a
3765 * lookup helper class is used to perform the method/constructor lookup;
3766 * at the end of the lookup, the helper is used to validate the results
3767 * (this last step might trigger overload resolution diagnostics).
3768 */
3769 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, MethodCheck methodCheck, LookupHelper lookupHelper) {
3770 MethodResolutionContext resolveContext = new MethodResolutionContext();
3771 resolveContext.methodCheck = methodCheck;
3772 return lookupMethod(env, pos, location, resolveContext, lookupHelper);
3773 }
3774
3775 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
3776 MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
3777 MethodResolutionContext prevResolutionContext = currentResolutionContext;
3778 try {
3779 Symbol bestSoFar = methodNotFound;
3780 currentResolutionContext = resolveContext;
3781 for (MethodResolutionPhase phase : methodResolutionSteps) {
3782 if (lookupHelper.shouldStop(bestSoFar, phase))
3783 break;
3784 MethodResolutionPhase prevPhase = currentResolutionContext.step;
3785 Symbol prevBest = bestSoFar;
3786 currentResolutionContext.step = phase;
3787 Symbol sym = lookupHelper.lookup(env, phase);
3788 lookupHelper.debug(pos, sym);
3789 bestSoFar = phase.mergeResults(bestSoFar, sym);
3790 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
3791 }
3792 return lookupHelper.access(env, pos, location, bestSoFar);
3793 } finally {
3794 currentResolutionContext = prevResolutionContext;
3795 }
3796 }
3797
3798 /**
3799 * Resolve `c.name' where name == this or name == super.
3800 * @param pos The position to use for error reporting.
3801 * @param env The environment current at the expression.
3802 * @param c The qualifier.
3803 * @param name The identifier's name.
3804 */
3805 Symbol resolveSelf(DiagnosticPosition pos,
3806 Env<AttrContext> env,
3807 TypeSymbol c,
3808 Name name) {
3809 Env<AttrContext> env1 = env;
3810 boolean staticOnly = false;
3811 while (env1.outer != null) {
3812 if (isStatic(env1)) staticOnly = true;
3813 if (env1.enclClass.sym == c) {
3814 Symbol sym = env1.info.scope.findFirst(name);
3815 if (sym != null) {
3816 if (staticOnly) sym = new StaticError(sym);
3817 return accessBase(sym, pos, env.enclClass.sym.type,
3818 name, true);
3819 }
3820 }
3821 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
3822 env1 = env1.outer;
3823 }
3824 if (c.isInterface() &&
3825 name == names._super && !isStatic(env) &&
3826 types.isDirectSuperInterface(c, env.enclClass.sym)) {
3827 //this might be a default super call if one of the superinterfaces is 'c'
3828 for (Type t : pruneInterfaces(env.enclClass.type)) {
3829 if (t.tsym == c) {
3830 env.info.defaultSuperCallSite = t;
3831 return new VarSymbol(0, names._super,
3832 types.asSuper(env.enclClass.type.referenceProjectionOrSelf(), c), env.enclClass.sym);
3833 }
3834 }
3835 //find a direct supertype that is a subtype of 'c'
3836 for (Type i : types.directSupertypes(env.enclClass.type)) {
3837 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
3838 log.error(pos,
3839 Errors.IllegalDefaultSuperCall(c,
3840 Fragments.RedundantSupertype(c, i)));
3841 return syms.errSymbol;
3842 }
3843 }
3844 Assert.error();
3845 }
3846 log.error(pos, Errors.NotEnclClass(c));
3847 return syms.errSymbol;
3848 }
3849 //where
3850 private List<Type> pruneInterfaces(Type t) {
3851 ListBuffer<Type> result = new ListBuffer<>();
3852 for (Type t1 : types.interfaces(t)) {
3853 boolean shouldAdd = true;
3854 for (Type t2 : types.directSupertypes(t)) {
3855 if (t1 != t2 && !t2.hasTag(ERROR) && types.isSubtypeNoCapture(t2, t1)) {
3856 shouldAdd = false;
3857 }
3858 }
3859 if (shouldAdd) {
3860 result.append(t1);
3861 }
3862 }
3863 return result.toList();
3864 }
3865
3866
3867 /**
3868 * Resolve `c.this' for an enclosing class c that contains the
3869 * named member.
3870 * @param pos The position to use for error reporting.
3871 * @param env The environment current at the expression.
3872 * @param member The member that must be contained in the result.
3873 */
3874 Symbol resolveSelfContaining(DiagnosticPosition pos,
3875 Env<AttrContext> env,
3876 Symbol member,
3877 boolean isSuperCall) {
3878 Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
3879 if (sym == null) {
3880 log.error(pos, Errors.EnclClassRequired(member));
3881 return syms.errSymbol;
3882 } else {
3883 return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
3884 }
3885 }
3886
3887 boolean enclosingInstanceMissing(Env<AttrContext> env, Type type) {
3888 if (type.hasTag(CLASS) && type.getEnclosingType().hasTag(CLASS)) {
3889 Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
3890 return encl == null || encl.kind.isResolutionError();
3891 }
3892 return false;
3893 }
3894
3895 private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
3896 Symbol member,
3897 boolean isSuperCall) {
3898 Name name = names._this;
3899 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
3900 boolean staticOnly = false;
3901 if (env1 != null) {
3902 while (env1 != null && env1.outer != null) {
3903 if (isStatic(env1)) staticOnly = true;
3904 if (env1.enclClass.sym.isSubClass(member.owner.enclClass(), types)) {
3905 Symbol sym = env1.info.scope.findFirst(name);
3906 if (sym != null) {
3907 if (staticOnly) sym = new StaticError(sym);
3908 return sym;
3909 }
3910 }
3911 if ((env1.enclClass.sym.flags() & STATIC) != 0)
3912 staticOnly = true;
3913 env1 = env1.outer;
3914 }
3915 }
3916 return null;
3917 }
3918
3919 /**
3920 * Resolve an appropriate implicit this instance for t's container.
3921 * JLS 8.8.5.1 and 15.9.2
3922 */
3923 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
3924 return resolveImplicitThis(pos, env, t, false);
3925 }
3926
3927 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
3928 Type thisType = (t.tsym.owner.kind.matches(KindSelector.VAL_MTH)
3929 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
3930 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
3931 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym) {
3932 log.error(pos, Errors.CantRefBeforeCtorCalled("this"));
3933 }
3934 return thisType;
3935 }
3936
3937 /* ***************************************************************************
3938 * ResolveError classes, indicating error situations when accessing symbols
3939 ****************************************************************************/
3940
3941 //used by TransTypes when checking target type of synthetic cast
3942 public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
3943 AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
3944 logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
3945 }
3946 //where
3947 private void logResolveError(ResolveError error,
3948 DiagnosticPosition pos,
3949 Symbol location,
3950 Type site,
3951 Name name,
3952 List<Type> argtypes,
3953 List<Type> typeargtypes) {
3954 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3955 pos, location, site, name, argtypes, typeargtypes);
3956 if (d != null) {
3957 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
3958 log.report(d);
3959 }
3960 }
3961
3962 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
3963
3964 public Object methodArguments(List<Type> argtypes) {
3965 if (argtypes == null || argtypes.isEmpty()) {
3966 return noArgs;
3967 } else {
3968 ListBuffer<Object> diagArgs = new ListBuffer<>();
3969 for (Type t : argtypes) {
3970 if (t.hasTag(DEFERRED)) {
3971 diagArgs.append(((DeferredAttr.DeferredType)t).tree);
3972 } else {
3973 diagArgs.append(t);
3974 }
3975 }
3976 return diagArgs;
3977 }
3978 }
3979
3980 /** check if a type is a subtype of Serializable, if that is available.*/
3981 boolean isSerializable(Type t) {
3982 try {
3983 syms.serializableType.complete();
3984 }
3985 catch (CompletionFailure e) {
3986 return false;
3987 }
3988 return types.isSubtype(t, syms.serializableType);
3989 }
3990
3991 /**
3992 * Root class for resolution errors. Subclass of ResolveError
3993 * represent a different kinds of resolution error - as such they must
3994 * specify how they map into concrete compiler diagnostics.
3995 */
3996 abstract class ResolveError extends Symbol {
3997
3998 /** The name of the kind of error, for debugging only. */
3999 final String debugName;
4000
4001 ResolveError(Kind kind, String debugName) {
4002 super(kind, 0, null, null, null);
4003 this.debugName = debugName;
4004 }
4005
4006 @Override @DefinedBy(Api.LANGUAGE_MODEL)
4007 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
4008 throw new AssertionError();
4009 }
4010
4011 @Override
4012 public String toString() {
4013 return debugName;
4014 }
4015
4016 @Override
4017 public boolean exists() {
4018 return false;
4019 }
4020
4021 @Override
4022 public boolean isStatic() {
4023 return false;
4024 }
4025
4026 /**
4027 * Create an external representation for this erroneous symbol to be
4028 * used during attribution - by default this returns the symbol of a
4029 * brand new error type which stores the original type found
4030 * during resolution.
4031 *
4032 * @param name the name used during resolution
4033 * @param location the location from which the symbol is accessed
4034 */
4035 protected Symbol access(Name name, TypeSymbol location) {
4036 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
4037 }
4038
4039 /**
4040 * Create a diagnostic representing this resolution error.
4041 *
4042 * @param dkind The kind of the diagnostic to be created (e.g error).
4043 * @param pos The position to be used for error reporting.
4044 * @param site The original type from where the selection took place.
4045 * @param name The name of the symbol to be resolved.
4046 * @param argtypes The invocation's value arguments,
4047 * if we looked for a method.
4048 * @param typeargtypes The invocation's type arguments,
4049 * if we looked for a method.
4050 */
4051 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4052 DiagnosticPosition pos,
4053 Symbol location,
4054 Type site,
4055 Name name,
4056 List<Type> argtypes,
4057 List<Type> typeargtypes);
4058 }
4059
4060 /**
4061 * This class is the root class of all resolution errors caused by
4062 * an invalid symbol being found during resolution.
4063 */
4064 abstract class InvalidSymbolError extends ResolveError {
4065
4066 /** The invalid symbol found during resolution */
4067 Symbol sym;
4068
4069 InvalidSymbolError(Kind kind, Symbol sym, String debugName) {
4070 super(kind, debugName);
4071 this.sym = sym;
4072 }
4073
4074 @Override
4075 public boolean exists() {
4076 return true;
4077 }
4078
4079 @Override
4080 public String toString() {
4081 return super.toString() + " wrongSym=" + sym;
4082 }
4083
4084 @Override
4085 public Symbol access(Name name, TypeSymbol location) {
4086 if (!sym.kind.isResolutionError() && sym.kind.matches(KindSelector.TYP))
4087 return types.createErrorType(name, location, sym.type).tsym;
4088 else
4089 return sym;
4090 }
4091 }
4092
4093 class BadRestrictedTypeError extends ResolveError {
4094 private final Name typeName;
4095 BadRestrictedTypeError(Name typeName) {
4096 super(Kind.BAD_RESTRICTED_TYPE, "bad var use");
4097 this.typeName = typeName;
4098 }
4099
4100 @Override
4101 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4102 return diags.create(dkind, log.currentSource(), pos, "illegal.ref.to.restricted.type", typeName);
4103 }
4104 }
4105
4106 /**
4107 * InvalidSymbolError error class indicating that a symbol matching a
4108 * given name does not exists in a given site.
4109 */
4110 class SymbolNotFoundError extends ResolveError {
4111
4112 SymbolNotFoundError(Kind kind) {
4113 this(kind, "symbol not found error");
4114 }
4115
4116 SymbolNotFoundError(Kind kind, String debugName) {
4117 super(kind, debugName);
4118 }
4119
4120 @Override
4121 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4122 DiagnosticPosition pos,
4123 Symbol location,
4124 Type site,
4125 Name name,
4126 List<Type> argtypes,
4127 List<Type> typeargtypes) {
4128 argtypes = argtypes == null ? List.nil() : argtypes;
4129 typeargtypes = typeargtypes == null ? List.nil() : typeargtypes;
4130 if (name == names.error)
4131 return null;
4132
4133 boolean hasLocation = false;
4134 if (location == null) {
4135 location = site.tsym;
4136 }
4137 if (!location.name.isEmpty()) {
4138 if (location.kind == PCK && !site.tsym.exists() && location.name != names.java) {
4139 return diags.create(dkind, log.currentSource(), pos,
4140 "doesnt.exist", location);
4141 }
4142 hasLocation = !location.name.equals(names._this) &&
4143 !location.name.equals(names._super);
4144 }
4145 boolean isConstructor = names.isInitOrVNew(name);
4146 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : kind.absentKind();
4147 Name idname = isConstructor ? site.tsym.name : name;
4148 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
4149 if (hasLocation) {
4150 return diags.create(dkind, log.currentSource(), pos,
4151 errKey, kindname, idname, //symbol kindname, name
4152 typeargtypes, args(argtypes), //type parameters and arguments (if any)
4153 getLocationDiag(location, site)); //location kindname, type
4154 }
4155 else {
4156 return diags.create(dkind, log.currentSource(), pos,
4157 errKey, kindname, idname, //symbol kindname, name
4158 typeargtypes, args(argtypes)); //type parameters and arguments (if any)
4159 }
4160 }
4161 //where
4162 private Object args(List<Type> args) {
4163 return args.isEmpty() ? args : methodArguments(args);
4164 }
4165
4166 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
4167 String key = "cant.resolve";
4168 String suffix = hasLocation ? ".location" : "";
4169 switch (kindname) {
4170 case METHOD:
4171 case CONSTRUCTOR: {
4172 suffix += ".args";
4173 suffix += hasTypeArgs ? ".params" : "";
4174 }
4175 }
4176 return key + suffix;
4177 }
4178 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
4179 if (location.kind == VAR) {
4180 return diags.fragment(Fragments.Location1(kindName(location),
4181 location,
4182 location.type));
4183 } else {
4184 return diags.fragment(Fragments.Location(typeKindName(site),
4185 site,
4186 null));
4187 }
4188 }
4189 }
4190
4191 /**
4192 * InvalidSymbolError error class indicating that a given symbol
4193 * (either a method, a constructor or an operand) is not applicable
4194 * given an actual arguments/type argument list.
4195 */
4196 class InapplicableSymbolError extends ResolveError {
4197
4198 protected MethodResolutionContext resolveContext;
4199
4200 InapplicableSymbolError(MethodResolutionContext context) {
4201 this(WRONG_MTH, "inapplicable symbol error", context);
4202 }
4203
4204 protected InapplicableSymbolError(Kind kind, String debugName, MethodResolutionContext context) {
4205 super(kind, debugName);
4206 this.resolveContext = context;
4207 }
4208
4209 @Override
4210 public String toString() {
4211 return super.toString();
4212 }
4213
4214 @Override
4215 public boolean exists() {
4216 return true;
4217 }
4218
4219 @Override
4220 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4221 DiagnosticPosition pos,
4222 Symbol location,
4223 Type site,
4224 Name name,
4225 List<Type> argtypes,
4226 List<Type> typeargtypes) {
4227 if (name == names.error)
4228 return null;
4229
4230 Pair<Symbol, JCDiagnostic> c = errCandidate();
4231 Symbol ws = c.fst.asMemberOf(site, types);
4232
4233 // If the problem is due to type arguments, then the method parameters aren't relevant,
4234 // so use the error message that omits them to avoid confusion.
4235 switch (c.snd.getCode()) {
4236 case "compiler.misc.wrong.number.type.args":
4237 case "compiler.misc.explicit.param.do.not.conform.to.bounds":
4238 return diags.create(dkind, log.currentSource(), pos,
4239 "cant.apply.symbol.noargs",
4240 compactMethodDiags ?
4241 d -> MethodResolutionDiagHelper.rewrite(diags, pos, log.currentSource(), dkind, c.snd) : null,
4242 kindName(ws),
4243 names.isInitOrVNew(ws.name) ? ws.owner.name : ws.name,
4244 ws.owner.type,
4245 c.snd);
4246 default:
4247 return diags.create(dkind, log.currentSource(), pos,
4248 "cant.apply.symbol",
4249 compactMethodDiags ?
4250 d -> MethodResolutionDiagHelper.rewrite(diags, pos, log.currentSource(), dkind, c.snd) : null,
4251 kindName(ws),
4252 names.isInitOrVNew(ws.name) ? ws.owner.name : ws.name,
4253 methodArguments(ws.type.getParameterTypes()),
4254 methodArguments(argtypes),
4255 kindName(ws.owner),
4256 ws.owner.type,
4257 c.snd);
4258 }
4259 }
4260
4261 @Override
4262 public Symbol access(Name name, TypeSymbol location) {
4263 Pair<Symbol, JCDiagnostic> cand = errCandidate();
4264 TypeSymbol errSymbol = types.createErrorType(name, location, cand != null ? cand.fst.type : syms.errSymbol.type).tsym;
4265 if (cand != null) {
4266 attrRecover.wrongMethodSymbolCandidate(errSymbol, cand.fst, cand.snd);
4267 }
4268 return errSymbol;
4269 }
4270
4271 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4272 Candidate bestSoFar = null;
4273 for (Candidate c : resolveContext.candidates) {
4274 if (c.isApplicable()) continue;
4275 bestSoFar = c;
4276 }
4277 Assert.checkNonNull(bestSoFar);
4278 return new Pair<>(bestSoFar.sym, bestSoFar.details);
4279 }
4280 }
4281
4282 /**
4283 * ResolveError error class indicating that a symbol (either methods, constructors or operand)
4284 * is not applicable given an actual arguments/type argument list.
4285 */
4286 class InapplicableSymbolsError extends InapplicableSymbolError {
4287
4288 InapplicableSymbolsError(MethodResolutionContext context) {
4289 super(WRONG_MTHS, "inapplicable symbols", context);
4290 }
4291
4292 @Override
4293 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4294 DiagnosticPosition pos,
4295 Symbol location,
4296 Type site,
4297 Name name,
4298 List<Type> argtypes,
4299 List<Type> typeargtypes) {
4300 Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
4301 Map<Symbol, JCDiagnostic> filteredCandidates = compactMethodDiags ?
4302 filterCandidates(candidatesMap) :
4303 mapCandidates();
4304 if (filteredCandidates.isEmpty()) {
4305 filteredCandidates = candidatesMap;
4306 }
4307 boolean truncatedDiag = candidatesMap.size() != filteredCandidates.size();
4308 if (filteredCandidates.size() > 1) {
4309 boolean isConstructor = names.isInitOrVNew(name);
4310 JCDiagnostic err = diags.create(dkind,
4311 null,
4312 truncatedDiag ?
4313 EnumSet.of(DiagnosticFlag.COMPRESSED) :
4314 EnumSet.noneOf(DiagnosticFlag.class),
4315 log.currentSource(),
4316 pos,
4317 "cant.apply.symbols",
4318 isConstructor ? KindName.CONSTRUCTOR : kind.absentKind(),
4319 isConstructor ? site.tsym.name : name,
4320 methodArguments(argtypes));
4321 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(filteredCandidates, site));
4322 } else if (filteredCandidates.size() == 1) {
4323 Map.Entry<Symbol, JCDiagnostic> _e =
4324 filteredCandidates.entrySet().iterator().next();
4325 final Pair<Symbol, JCDiagnostic> p = new Pair<>(_e.getKey(), _e.getValue());
4326 JCDiagnostic d = new InapplicableSymbolError(resolveContext) {
4327 @Override
4328 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4329 return p;
4330 }
4331 }.getDiagnostic(dkind, pos,
4332 location, site, name, argtypes, typeargtypes);
4333 if (truncatedDiag) {
4334 d.setFlag(DiagnosticFlag.COMPRESSED);
4335 }
4336 return d;
4337 } else {
4338 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
4339 location, site, name, argtypes, typeargtypes);
4340 }
4341 }
4342 //where
4343 private Map<Symbol, JCDiagnostic> mapCandidates() {
4344 MostSpecificMap candidates = new MostSpecificMap();
4345 for (Candidate c : resolveContext.candidates) {
4346 if (c.isApplicable()) continue;
4347 candidates.put(c);
4348 }
4349 return candidates;
4350 }
4351
4352 @SuppressWarnings("serial")
4353 private class MostSpecificMap extends LinkedHashMap<Symbol, JCDiagnostic> {
4354 private void put(Candidate c) {
4355 ListBuffer<Symbol> overridden = new ListBuffer<>();
4356 for (Symbol s : keySet()) {
4357 if (s == c.sym) {
4358 continue;
4359 }
4360 if (c.sym.overrides(s, (TypeSymbol)s.owner, types, false)) {
4361 overridden.add(s);
4362 } else if (s.overrides(c.sym, (TypeSymbol)c.sym.owner, types, false)) {
4363 return;
4364 }
4365 }
4366 for (Symbol s : overridden) {
4367 remove(s);
4368 }
4369 put(c.sym, c.details);
4370 }
4371 }
4372
4373 Map<Symbol, JCDiagnostic> filterCandidates(Map<Symbol, JCDiagnostic> candidatesMap) {
4374 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<>();
4375 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
4376 JCDiagnostic d = _entry.getValue();
4377 if (!new Template(MethodCheckDiag.ARITY_MISMATCH.regex()).matches(d)) {
4378 candidates.put(_entry.getKey(), d);
4379 }
4380 }
4381 return candidates;
4382 }
4383
4384 private List<JCDiagnostic> candidateDetails(Map<Symbol, JCDiagnostic> candidatesMap, Type site) {
4385 List<JCDiagnostic> details = List.nil();
4386 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
4387 Symbol sym = _entry.getKey();
4388 JCDiagnostic detailDiag =
4389 diags.fragment(Fragments.InapplicableMethod(Kinds.kindName(sym),
4390 sym.location(site, types),
4391 sym.asMemberOf(site, types),
4392 _entry.getValue()));
4393 details = details.prepend(detailDiag);
4394 }
4395 //typically members are visited in reverse order (see Scope)
4396 //so we need to reverse the candidate list so that candidates
4397 //conform to source order
4398 return details;
4399 }
4400
4401 @Override
4402 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4403 Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
4404 Map<Symbol, JCDiagnostic> filteredCandidates = filterCandidates(candidatesMap);
4405 if (filteredCandidates.size() == 1) {
4406 return Pair.of(filteredCandidates.keySet().iterator().next(),
4407 filteredCandidates.values().iterator().next());
4408 }
4409 return null;
4410 }
4411 }
4412
4413 /**
4414 * DiamondError error class indicating that a constructor symbol is not applicable
4415 * given an actual arguments/type argument list using diamond inference.
4416 */
4417 class DiamondError extends InapplicableSymbolError {
4418
4419 Symbol sym;
4420
4421 public DiamondError(Symbol sym, MethodResolutionContext context) {
4422 super(sym.kind, "diamondError", context);
4423 this.sym = sym;
4424 }
4425
4426 JCDiagnostic getDetails() {
4427 return (sym.kind == WRONG_MTH) ?
4428 ((InapplicableSymbolError)sym.baseSymbol()).errCandidate().snd :
4429 null;
4430 }
4431
4432 @Override
4433 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
4434 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4435 JCDiagnostic details = getDetails();
4436 if (details != null && compactMethodDiags) {
4437 JCDiagnostic simpleDiag =
4438 MethodResolutionDiagHelper.rewrite(diags, pos, log.currentSource(), dkind, details);
4439 if (simpleDiag != null) {
4440 return simpleDiag;
4441 }
4442 }
4443 String key = details == null ?
4444 "cant.apply.diamond" :
4445 "cant.apply.diamond.1";
4446 return diags.create(dkind, log.currentSource(), pos, key,
4447 Fragments.Diamond(site.tsym), details);
4448 }
4449 }
4450
4451 /**
4452 * An InvalidSymbolError error class indicating that a symbol is not
4453 * accessible from a given site
4454 */
4455 class AccessError extends InvalidSymbolError {
4456
4457 private Env<AttrContext> env;
4458 private Type site;
4459
4460 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
4461 super(HIDDEN, sym, "access error");
4462 this.env = env;
4463 this.site = site;
4464 }
4465
4466 @Override
4467 public boolean exists() {
4468 return false;
4469 }
4470
4471 @Override
4472 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4473 DiagnosticPosition pos,
4474 Symbol location,
4475 Type site,
4476 Name name,
4477 List<Type> argtypes,
4478 List<Type> typeargtypes) {
4479 if (names.isInitOrVNew(sym.name) && sym.owner != site.tsym) {
4480 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
4481 pos, location, site, name, argtypes, typeargtypes);
4482 }
4483 else if ((sym.flags() & PUBLIC) != 0
4484 || (env != null && this.site != null
4485 && !isAccessible(env, this.site))) {
4486 if (sym.owner.kind == PCK) {
4487 return diags.create(dkind, log.currentSource(),
4488 pos, "not.def.access.package.cant.access",
4489 sym, sym.location(), inaccessiblePackageReason(env, sym.packge()));
4490 } else if ( sym.packge() != syms.rootPackage
4491 && !symbolPackageVisible(env, sym)) {
4492 return diags.create(dkind, log.currentSource(),
4493 pos, "not.def.access.class.intf.cant.access.reason",
4494 sym, sym.location(), sym.location().packge(),
4495 inaccessiblePackageReason(env, sym.packge()));
4496 } else {
4497 return diags.create(dkind, log.currentSource(),
4498 pos, "not.def.access.class.intf.cant.access",
4499 sym, sym.location());
4500 }
4501 }
4502 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
4503 return diags.create(dkind, log.currentSource(),
4504 pos, "report.access", sym,
4505 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
4506 sym.location());
4507 }
4508 else {
4509 return diags.create(dkind, log.currentSource(),
4510 pos, "not.def.public.cant.access", sym, sym.location());
4511 }
4512 }
4513
4514 private String toString(Type type) {
4515 StringBuilder sb = new StringBuilder();
4516 sb.append(type);
4517 if (type != null) {
4518 sb.append("[tsym:").append(type.tsym);
4519 if (type.tsym != null)
4520 sb.append("packge:").append(type.tsym.packge());
4521 sb.append("]");
4522 }
4523 return sb.toString();
4524 }
4525 }
4526
4527 class InvisibleSymbolError extends InvalidSymbolError {
4528
4529 private final Env<AttrContext> env;
4530 private final boolean suppressError;
4531
4532 InvisibleSymbolError(Env<AttrContext> env, boolean suppressError, Symbol sym) {
4533 super(HIDDEN, sym, "invisible class error");
4534 this.env = env;
4535 this.suppressError = suppressError;
4536 this.name = sym.name;
4537 }
4538
4539 @Override
4540 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4541 DiagnosticPosition pos,
4542 Symbol location,
4543 Type site,
4544 Name name,
4545 List<Type> argtypes,
4546 List<Type> typeargtypes) {
4547 if (suppressError)
4548 return null;
4549
4550 if (sym.kind == PCK) {
4551 JCDiagnostic details = inaccessiblePackageReason(env, sym.packge());
4552 return diags.create(dkind, log.currentSource(),
4553 pos, "package.not.visible", sym, details);
4554 }
4555
4556 JCDiagnostic details = inaccessiblePackageReason(env, sym.packge());
4557
4558 if (pos.getTree() != null) {
4559 Symbol o = sym;
4560 JCTree tree = pos.getTree();
4561
4562 while (o.kind != PCK && tree.hasTag(SELECT)) {
4563 o = o.owner;
4564 tree = ((JCFieldAccess) tree).selected;
4565 }
4566
4567 if (o.kind == PCK) {
4568 pos = tree.pos();
4569
4570 return diags.create(dkind, log.currentSource(),
4571 pos, "package.not.visible", o, details);
4572 }
4573 }
4574
4575 return diags.create(dkind, log.currentSource(),
4576 pos, "not.def.access.package.cant.access", sym, sym.packge(), details);
4577 }
4578 }
4579
4580 JCDiagnostic inaccessiblePackageReason(Env<AttrContext> env, PackageSymbol sym) {
4581 //no dependency:
4582 if (!env.toplevel.modle.readModules.contains(sym.modle)) {
4583 //does not read:
4584 if (sym.modle != syms.unnamedModule) {
4585 if (env.toplevel.modle != syms.unnamedModule) {
4586 return diags.fragment(Fragments.NotDefAccessDoesNotRead(env.toplevel.modle,
4587 sym,
4588 sym.modle));
4589 } else {
4590 return diags.fragment(Fragments.NotDefAccessDoesNotReadFromUnnamed(sym,
4591 sym.modle));
4592 }
4593 } else {
4594 return diags.fragment(Fragments.NotDefAccessDoesNotReadUnnamed(sym,
4595 env.toplevel.modle));
4596 }
4597 } else {
4598 if (sym.packge().modle.exports.stream().anyMatch(e -> e.packge == sym)) {
4599 //not exported to this module:
4600 if (env.toplevel.modle != syms.unnamedModule) {
4601 return diags.fragment(Fragments.NotDefAccessNotExportedToModule(sym,
4602 sym.modle,
4603 env.toplevel.modle));
4604 } else {
4605 return diags.fragment(Fragments.NotDefAccessNotExportedToModuleFromUnnamed(sym,
4606 sym.modle));
4607 }
4608 } else {
4609 //not exported:
4610 if (env.toplevel.modle != syms.unnamedModule) {
4611 return diags.fragment(Fragments.NotDefAccessNotExported(sym,
4612 sym.modle));
4613 } else {
4614 return diags.fragment(Fragments.NotDefAccessNotExportedFromUnnamed(sym,
4615 sym.modle));
4616 }
4617 }
4618 }
4619 }
4620
4621 /**
4622 * InvalidSymbolError error class indicating that an instance member
4623 * has erroneously been accessed from a static context.
4624 */
4625 class StaticError extends InvalidSymbolError {
4626
4627 StaticError(Symbol sym) {
4628 super(STATICERR, sym, "static error");
4629 }
4630
4631 @Override
4632 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4633 DiagnosticPosition pos,
4634 Symbol location,
4635 Type site,
4636 Name name,
4637 List<Type> argtypes,
4638 List<Type> typeargtypes) {
4639 Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
4640 ? types.erasure(sym.type).tsym
4641 : sym);
4642 return diags.create(dkind, log.currentSource(), pos,
4643 "non-static.cant.be.ref", kindName(sym), errSym);
4644 }
4645 }
4646
4647 /**
4648 * InvalidSymbolError error class indicating that a pair of symbols
4649 * (either methods, constructors or operands) are ambiguous
4650 * given an actual arguments/type argument list.
4651 */
4652 class AmbiguityError extends ResolveError {
4653
4654 /** The other maximally specific symbol */
4655 List<Symbol> ambiguousSyms = List.nil();
4656
4657 @Override
4658 public boolean exists() {
4659 return true;
4660 }
4661
4662 AmbiguityError(Symbol sym1, Symbol sym2) {
4663 super(AMBIGUOUS, "ambiguity error");
4664 ambiguousSyms = flatten(sym2).appendList(flatten(sym1));
4665 }
4666
4667 private List<Symbol> flatten(Symbol sym) {
4668 if (sym.kind == AMBIGUOUS) {
4669 return ((AmbiguityError)sym.baseSymbol()).ambiguousSyms;
4670 } else {
4671 return List.of(sym);
4672 }
4673 }
4674
4675 AmbiguityError addAmbiguousSymbol(Symbol s) {
4676 ambiguousSyms = ambiguousSyms.prepend(s);
4677 return this;
4678 }
4679
4680 @Override
4681 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4682 DiagnosticPosition pos,
4683 Symbol location,
4684 Type site,
4685 Name name,
4686 List<Type> argtypes,
4687 List<Type> typeargtypes) {
4688 List<Symbol> diagSyms = ambiguousSyms.reverse();
4689 Symbol s1 = diagSyms.head;
4690 Symbol s2 = diagSyms.tail.head;
4691 Name sname = s1.name;
4692 if (names.isInitOrVNew(sname)) sname = s1.owner.name;
4693 return diags.create(dkind, log.currentSource(),
4694 pos, "ref.ambiguous", sname,
4695 kindName(s1),
4696 s1,
4697 s1.location(site, types),
4698 kindName(s2),
4699 s2,
4700 s2.location(site, types));
4701 }
4702
4703 /**
4704 * If multiple applicable methods are found during overload and none of them
4705 * is more specific than the others, attempt to merge their signatures.
4706 */
4707 Symbol mergeAbstracts(Type site) {
4708 List<Symbol> ambiguousInOrder = ambiguousSyms.reverse();
4709 return types.mergeAbstracts(ambiguousInOrder, site, true).orElse(this);
4710 }
4711
4712 @Override
4713 protected Symbol access(Name name, TypeSymbol location) {
4714 Symbol firstAmbiguity = ambiguousSyms.last();
4715 return firstAmbiguity.kind == TYP ?
4716 types.createErrorType(name, location, firstAmbiguity.type).tsym :
4717 firstAmbiguity;
4718 }
4719 }
4720
4721 class BadVarargsMethod extends ResolveError {
4722
4723 ResolveError delegatedError;
4724
4725 BadVarargsMethod(ResolveError delegatedError) {
4726 super(delegatedError.kind, "badVarargs");
4727 this.delegatedError = delegatedError;
4728 }
4729
4730 @Override
4731 public Symbol baseSymbol() {
4732 return delegatedError.baseSymbol();
4733 }
4734
4735 @Override
4736 protected Symbol access(Name name, TypeSymbol location) {
4737 return delegatedError.access(name, location);
4738 }
4739
4740 @Override
4741 public boolean exists() {
4742 return true;
4743 }
4744
4745 @Override
4746 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4747 return delegatedError.getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes);
4748 }
4749 }
4750
4751 /**
4752 * BadMethodReferenceError error class indicating that a method reference symbol has been found,
4753 * but with the wrong staticness.
4754 */
4755 class BadMethodReferenceError extends StaticError {
4756
4757 boolean unboundLookup;
4758
4759 public BadMethodReferenceError(Symbol sym, boolean unboundLookup) {
4760 super(sym);
4761 this.unboundLookup = unboundLookup;
4762 }
4763
4764 @Override
4765 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4766 final String key;
4767 if (!unboundLookup) {
4768 key = "bad.static.method.in.bound.lookup";
4769 } else if (sym.isStatic()) {
4770 key = "bad.static.method.in.unbound.lookup";
4771 } else {
4772 key = "bad.instance.method.in.unbound.lookup";
4773 }
4774 return sym.kind.isResolutionError() ?
4775 ((ResolveError)sym).getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes) :
4776 diags.create(dkind, log.currentSource(), pos, key, Kinds.kindName(sym), sym);
4777 }
4778 }
4779
4780 /**
4781 * BadConstructorReferenceError error class indicating that a constructor reference symbol has been found,
4782 * but pointing to a class for which an enclosing instance is not available.
4783 */
4784 class BadConstructorReferenceError extends InvalidSymbolError {
4785
4786 public BadConstructorReferenceError(Symbol sym) {
4787 super(MISSING_ENCL, sym, "BadConstructorReferenceError");
4788 }
4789
4790 @Override
4791 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4792 return diags.create(dkind, log.currentSource(), pos,
4793 "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
4794 }
4795 }
4796
4797 class BadClassFileError extends InvalidSymbolError {
4798
4799 private final CompletionFailure ex;
4800
4801 public BadClassFileError(CompletionFailure ex) {
4802 super(HIDDEN, ex.sym, "BadClassFileError");
4803 this.name = sym.name;
4804 this.ex = ex;
4805 }
4806
4807 @Override
4808 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4809 JCDiagnostic d = diags.create(dkind, log.currentSource(), pos,
4810 "cant.access", ex.sym, ex.getDetailValue());
4811
4812 d.setFlag(DiagnosticFlag.NON_DEFERRABLE);
4813 return d;
4814 }
4815
4816 }
4817
4818 /**
4819 * Helper class for method resolution diagnostic simplification.
4820 * Certain resolution diagnostic are rewritten as simpler diagnostic
4821 * where the enclosing resolution diagnostic (i.e. 'inapplicable method')
4822 * is stripped away, as it doesn't carry additional info. The logic
4823 * for matching a given diagnostic is given in terms of a template
4824 * hierarchy: a diagnostic template can be specified programmatically,
4825 * so that only certain diagnostics are matched. Each templete is then
4826 * associated with a rewriter object that carries out the task of rewtiting
4827 * the diagnostic to a simpler one.
4828 */
4829 static class MethodResolutionDiagHelper {
4830
4831 /**
4832 * A diagnostic rewriter transforms a method resolution diagnostic
4833 * into a simpler one
4834 */
4835 interface DiagnosticRewriter {
4836 JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4837 DiagnosticPosition preferredPos, DiagnosticSource preferredSource,
4838 DiagnosticType preferredKind, JCDiagnostic d);
4839 }
4840
4841 /**
4842 * A diagnostic template is made up of two ingredients: (i) a regular
4843 * expression for matching a diagnostic key and (ii) a list of sub-templates
4844 * for matching diagnostic arguments.
4845 */
4846 static class Template {
4847
4848 /** regex used to match diag key */
4849 String regex;
4850
4851 /** templates used to match diagnostic args */
4852 Template[] subTemplates;
4853
4854 Template(String key, Template... subTemplates) {
4855 this.regex = key;
4856 this.subTemplates = subTemplates;
4857 }
4858
4859 /**
4860 * Returns true if the regex matches the diagnostic key and if
4861 * all diagnostic arguments are matches by corresponding sub-templates.
4862 */
4863 boolean matches(Object o) {
4864 JCDiagnostic d = (JCDiagnostic)o;
4865 Object[] args = d.getArgs();
4866 if (!d.getCode().matches(regex) ||
4867 subTemplates.length != d.getArgs().length) {
4868 return false;
4869 }
4870 for (int i = 0; i < args.length ; i++) {
4871 if (!subTemplates[i].matches(args[i])) {
4872 return false;
4873 }
4874 }
4875 return true;
4876 }
4877 }
4878
4879 /**
4880 * Common rewriter for all argument mismatch simplifications.
4881 */
4882 static class ArgMismatchRewriter implements DiagnosticRewriter {
4883
4884 /** the index of the subdiagnostic to be used as primary. */
4885 int causeIndex;
4886
4887 public ArgMismatchRewriter(int causeIndex) {
4888 this.causeIndex = causeIndex;
4889 }
4890
4891 @Override
4892 public JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4893 DiagnosticPosition preferredPos, DiagnosticSource preferredSource,
4894 DiagnosticType preferredKind, JCDiagnostic d) {
4895 JCDiagnostic cause = (JCDiagnostic)d.getArgs()[causeIndex];
4896 DiagnosticPosition pos = d.getDiagnosticPosition();
4897 if (pos == null) {
4898 pos = preferredPos;
4899 }
4900 return diags.create(preferredKind, preferredSource, pos,
4901 "prob.found.req", cause);
4902 }
4903 }
4904
4905 /** a dummy template that match any diagnostic argument */
4906 static final Template skip = new Template("") {
4907 @Override
4908 boolean matches(Object d) {
4909 return true;
4910 }
4911 };
4912
4913 /** template for matching inference-free arguments mismatch failures */
4914 static final Template argMismatchTemplate = new Template(MethodCheckDiag.ARG_MISMATCH.regex(), skip);
4915
4916 /** template for matching inference related arguments mismatch failures */
4917 static final Template inferArgMismatchTemplate = new Template(MethodCheckDiag.ARG_MISMATCH.regex(), skip, skip) {
4918 @Override
4919 boolean matches(Object o) {
4920 if (!super.matches(o)) {
4921 return false;
4922 }
4923 JCDiagnostic d = (JCDiagnostic)o;
4924 @SuppressWarnings("unchecked")
4925 List<Type> tvars = (List<Type>)d.getArgs()[0];
4926 return !containsAny(d, tvars);
4927 }
4928
4929 BiPredicate<Object, List<Type>> containsPredicate = (o, ts) -> {
4930 if (o instanceof Type type) {
4931 return type.containsAny(ts);
4932 } else if (o instanceof JCDiagnostic diagnostic) {
4933 return containsAny(diagnostic, ts);
4934 } else {
4935 return false;
4936 }
4937 };
4938
4939 boolean containsAny(JCDiagnostic d, List<Type> ts) {
4940 return Stream.of(d.getArgs())
4941 .anyMatch(o -> containsPredicate.test(o, ts));
4942 }
4943 };
4944
4945 /** rewriter map used for method resolution simplification */
4946 static final Map<Template, DiagnosticRewriter> rewriters = new LinkedHashMap<>();
4947
4948 static {
4949 rewriters.put(argMismatchTemplate, new ArgMismatchRewriter(0));
4950 rewriters.put(inferArgMismatchTemplate, new ArgMismatchRewriter(1));
4951 }
4952
4953 /**
4954 * Main entry point for diagnostic rewriting - given a diagnostic, see if any templates matches it,
4955 * and rewrite it accordingly.
4956 */
4957 static JCDiagnostic rewrite(JCDiagnostic.Factory diags, DiagnosticPosition pos, DiagnosticSource source,
4958 DiagnosticType dkind, JCDiagnostic d) {
4959 for (Map.Entry<Template, DiagnosticRewriter> _entry : rewriters.entrySet()) {
4960 if (_entry.getKey().matches(d)) {
4961 JCDiagnostic simpleDiag =
4962 _entry.getValue().rewriteDiagnostic(diags, pos, source, dkind, d);
4963 simpleDiag.setFlag(DiagnosticFlag.COMPRESSED);
4964 return simpleDiag;
4965 }
4966 }
4967 return null;
4968 }
4969 }
4970
4971 enum MethodResolutionPhase {
4972 BASIC(false, false),
4973 BOX(true, false),
4974 VARARITY(true, true) {
4975 @Override
4976 public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
4977 //Check invariants (see {@code LookupHelper.shouldStop})
4978 Assert.check(bestSoFar.kind.isResolutionError() && bestSoFar.kind != AMBIGUOUS);
4979 if (!sym.kind.isResolutionError()) {
4980 //varargs resolution successful
4981 return sym;
4982 } else {
4983 //pick best error
4984 switch (bestSoFar.kind) {
4985 case WRONG_MTH:
4986 case WRONG_MTHS:
4987 //Override previous errors if they were caused by argument mismatch.
4988 //This generally means preferring current symbols - but we need to pay
4989 //attention to the fact that the varargs lookup returns 'less' candidates
4990 //than the previous rounds, and adjust that accordingly.
4991 switch (sym.kind) {
4992 case WRONG_MTH:
4993 //if the previous round matched more than one method, return that
4994 //result instead
4995 return bestSoFar.kind == WRONG_MTHS ?
4996 bestSoFar : sym;
4997 case ABSENT_MTH:
4998 //do not override erroneous symbol if the arity lookup did not
4999 //match any method
5000 return bestSoFar;
5001 case WRONG_MTHS:
5002 default:
5003 //safe to override
5004 return sym;
5005 }
5006 default:
5007 //otherwise, return first error
5008 return bestSoFar;
5009 }
5010 }
5011 }
5012 };
5013
5014 final boolean isBoxingRequired;
5015 final boolean isVarargsRequired;
5016
5017 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
5018 this.isBoxingRequired = isBoxingRequired;
5019 this.isVarargsRequired = isVarargsRequired;
5020 }
5021
5022 public boolean isBoxingRequired() {
5023 return isBoxingRequired;
5024 }
5025
5026 public boolean isVarargsRequired() {
5027 return isVarargsRequired;
5028 }
5029
5030 public Symbol mergeResults(Symbol prev, Symbol sym) {
5031 return sym;
5032 }
5033 }
5034
5035 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
5036
5037 /**
5038 * A resolution context is used to keep track of intermediate results of
5039 * overload resolution, such as list of method that are not applicable
5040 * (used to generate more precise diagnostics) and so on. Resolution contexts
5041 * can be nested - this means that when each overload resolution routine should
5042 * work within the resolution context it created.
5043 */
5044 class MethodResolutionContext {
5045
5046 private List<Candidate> candidates = List.nil();
5047
5048 MethodResolutionPhase step = null;
5049
5050 MethodCheck methodCheck = resolveMethodCheck;
5051
5052 private boolean internalResolution = false;
5053 private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
5054
5055 void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
5056 Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
5057 candidates = candidates.append(c);
5058 }
5059
5060 void addApplicableCandidate(Symbol sym, Type mtype) {
5061 Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
5062 candidates = candidates.append(c);
5063 }
5064
5065 DeferredAttrContext deferredAttrContext(Symbol sym, InferenceContext inferenceContext, ResultInfo pendingResult, Warner warn) {
5066 DeferredAttrContext parent = (pendingResult == null)
5067 ? deferredAttr.emptyDeferredAttrContext
5068 : pendingResult.checkContext.deferredAttrContext();
5069 return deferredAttr.new DeferredAttrContext(attrMode, sym, step,
5070 inferenceContext, parent, warn);
5071 }
5072
5073 /**
5074 * This class represents an overload resolution candidate. There are two
5075 * kinds of candidates: applicable methods and inapplicable methods;
5076 * applicable methods have a pointer to the instantiated method type,
5077 * while inapplicable candidates contain further details about the
5078 * reason why the method has been considered inapplicable.
5079 */
5080 @SuppressWarnings("overrides")
5081 class Candidate {
5082
5083 final MethodResolutionPhase step;
5084 final Symbol sym;
5085 final JCDiagnostic details;
5086 final Type mtype;
5087
5088 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
5089 this.step = step;
5090 this.sym = sym;
5091 this.details = details;
5092 this.mtype = mtype;
5093 }
5094
5095 boolean isApplicable() {
5096 return mtype != null;
5097 }
5098 }
5099
5100 DeferredAttr.AttrMode attrMode() {
5101 return attrMode;
5102 }
5103
5104 boolean internal() {
5105 return internalResolution;
5106 }
5107 }
5108
5109 MethodResolutionContext currentResolutionContext = null;
5110 }