1 /*
2 * Copyright (c) 1999, 2023, 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 private final boolean compactMethodDiags;
110 private final boolean allowLocalVariableTypeInference;
111 private final boolean allowYieldStatement;
112 final EnumSet<VerboseResolutionMode> verboseResolutionMode;
113 final boolean dumpMethodReferenceSearchResults;
114
115 WriteableScope polymorphicSignatureScope;
116
117 @SuppressWarnings("this-escape")
118 protected Resolve(Context context) {
119 context.put(resolveKey, this);
120 syms = Symtab.instance(context);
121
122 varNotFound = new SymbolNotFoundError(ABSENT_VAR);
123 methodNotFound = new SymbolNotFoundError(ABSENT_MTH);
124 typeNotFound = new SymbolNotFoundError(ABSENT_TYP);
125 referenceNotFound = ReferenceLookupResult.error(methodNotFound);
126
127 names = Names.instance(context);
128 log = Log.instance(context);
129 attr = Attr.instance(context);
130 attrRecover = AttrRecover.instance(context);
131 deferredAttr = DeferredAttr.instance(context);
132 chk = Check.instance(context);
133 infer = Infer.instance(context);
134 finder = ClassFinder.instance(context);
135 moduleFinder = ModuleFinder.instance(context);
136 types = Types.instance(context);
137 diags = JCDiagnostic.Factory.instance(context);
138 Preview preview = Preview.instance(context);
139 Source source = Source.instance(context);
140 Options options = Options.instance(context);
141 compactMethodDiags = options.isSet(Option.XDIAGS, "compact") ||
142 options.isUnset(Option.XDIAGS) && options.isUnset("rawDiagnostics");
143 verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
144 Target target = Target.instance(context);
145 allowLocalVariableTypeInference = Feature.LOCAL_VARIABLE_TYPE_INFERENCE.allowedInSource(source);
146 allowYieldStatement = Feature.SWITCH_EXPRESSION.allowedInSource(source);
147 polymorphicSignatureScope = WriteableScope.create(syms.noSymbol);
148 allowModules = Feature.MODULES.allowedInSource(source);
149 allowRecords = Feature.RECORDS.allowedInSource(source);
150 dumpMethodReferenceSearchResults = options.isSet("debug.dumpMethodReferenceSearchResults");
151 }
152
153 /** error symbols, which are returned when resolution fails
154 */
155 private final SymbolNotFoundError varNotFound;
156 private final SymbolNotFoundError methodNotFound;
157 private final SymbolNotFoundError typeNotFound;
158
159 /** empty reference lookup result */
160 private final ReferenceLookupResult referenceNotFound;
161
162 public static Resolve instance(Context context) {
163 Resolve instance = context.get(resolveKey);
164 if (instance == null)
165 instance = new Resolve(context);
166 return instance;
167 }
168
169 private static Symbol bestOf(Symbol s1,
170 Symbol s2) {
171 return s1.kind.betterThan(s2.kind) ? s1 : s2;
172 }
173
174 // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
175 enum VerboseResolutionMode {
176 SUCCESS("success"),
177 FAILURE("failure"),
178 APPLICABLE("applicable"),
179 INAPPLICABLE("inapplicable"),
180 DEFERRED_INST("deferred-inference"),
181 PREDEF("predef"),
182 OBJECT_INIT("object-init"),
183 INTERNAL("internal");
184
185 final String opt;
186
187 private VerboseResolutionMode(String opt) {
188 this.opt = opt;
189 }
190
191 static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
192 String s = opts.get("debug.verboseResolution");
193 EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
194 if (s == null) return res;
195 if (s.contains("all")) {
196 res = EnumSet.allOf(VerboseResolutionMode.class);
197 }
198 Collection<String> args = Arrays.asList(s.split(","));
199 for (VerboseResolutionMode mode : values()) {
200 if (args.contains(mode.opt)) {
201 res.add(mode);
202 } else if (args.contains("-" + mode.opt)) {
203 res.remove(mode);
204 }
205 }
206 return res;
207 }
208 }
209
210 void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
211 List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
212 boolean success = !bestSoFar.kind.isResolutionError();
213
214 if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
215 return;
216 } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
217 return;
218 }
219
220 if (bestSoFar.name == names.init &&
221 bestSoFar.owner == syms.objectType.tsym &&
222 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
223 return; //skip diags for Object constructor resolution
224 } else if (site == syms.predefClass.type &&
225 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
226 return; //skip spurious diags for predef symbols (i.e. operators)
227 } else if (currentResolutionContext.internalResolution &&
228 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
229 return;
230 }
231
232 int pos = 0;
233 int mostSpecificPos = -1;
234 ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
235 for (Candidate c : currentResolutionContext.candidates) {
236 if (currentResolutionContext.step != c.step ||
237 (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
238 (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
239 continue;
240 } else {
241 subDiags.append(c.isApplicable() ?
242 getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
243 getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
244 if (c.sym == bestSoFar)
245 mostSpecificPos = pos;
246 pos++;
247 }
248 }
249 String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
250 List<Type> argtypes2 = argtypes.map(deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
251 JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
252 site.tsym, mostSpecificPos, currentResolutionContext.step,
253 methodArguments(argtypes2),
254 methodArguments(typeargtypes));
255 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
256 log.report(d);
257 }
258
259 JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
260 JCDiagnostic subDiag = null;
261 if (sym.type.hasTag(FORALL)) {
262 subDiag = diags.fragment(Fragments.PartialInstSig(inst));
263 }
264
265 String key = subDiag == null ?
266 "applicable.method.found" :
267 "applicable.method.found.1";
268
269 return diags.fragment(key, pos, sym, subDiag);
270 }
271
272 JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
273 return diags.fragment(Fragments.NotApplicableMethodFound(pos, sym, subDiag));
274 }
275 // </editor-fold>
276
277 /* ************************************************************************
278 * Identifier resolution
279 *************************************************************************/
280
281 /** An environment is "static" if its static level is greater than
282 * the one of its outer environment
283 */
284 protected static boolean isStatic(Env<AttrContext> env) {
285 return env.outer != null && env.info.staticLevel > env.outer.info.staticLevel;
286 }
287
288 /** An environment is an "initializer" if it is a constructor or
289 * an instance initializer.
290 */
291 static boolean isInitializer(Env<AttrContext> env) {
292 Symbol owner = env.info.scope.owner;
293 return owner.isConstructor() ||
294 owner.owner.kind == TYP &&
295 (owner.kind == VAR ||
296 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
297 (owner.flags() & STATIC) == 0;
298 }
299
300 /** Is class accessible in given environment?
301 * @param env The current environment.
302 * @param c The class whose accessibility is checked.
303 */
304 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
305 return isAccessible(env, c, false);
306 }
307
308 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
309
310 /* 15.9.5.1: Note that it is possible for the signature of the anonymous constructor
311 to refer to an inaccessible type
312 */
313 if (env.enclMethod != null && (env.enclMethod.mods.flags & ANONCONSTR) != 0)
314 return true;
315
316 if (env.info.visitingServiceImplementation &&
317 env.toplevel.modle == c.packge().modle) {
318 return true;
319 }
320
321 boolean isAccessible = false;
322 switch ((short)(c.flags() & AccessFlags)) {
323 case PRIVATE:
324 isAccessible =
325 env.enclClass.sym.outermostClass() ==
326 c.owner.outermostClass();
327 break;
328 case 0:
329 isAccessible =
330 env.toplevel.packge == c.owner // fast special case
331 ||
332 env.toplevel.packge == c.packge();
333 break;
334 default: // error recovery
335 isAccessible = true;
336 break;
337 case PUBLIC:
338 if (allowModules) {
339 ModuleSymbol currModule = env.toplevel.modle;
340 currModule.complete();
341 PackageSymbol p = c.packge();
342 isAccessible =
343 currModule == p.modle ||
344 currModule.visiblePackages.get(p.fullname) == p ||
345 p == syms.rootPackage ||
346 (p.modle == syms.unnamedModule && currModule.readModules.contains(p.modle));
347 } else {
348 isAccessible = true;
349 }
350 break;
351 case PROTECTED:
352 isAccessible =
353 env.toplevel.packge == c.owner // fast special case
354 ||
355 env.toplevel.packge == c.packge()
356 ||
357 isInnerSubClass(env.enclClass.sym, c.owner)
358 ||
359 env.info.allowProtectedAccess;
360 break;
361 }
362 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
363 isAccessible :
364 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
365 }
366 //where
367 /** Is given class a subclass of given base class, or an inner class
368 * of a subclass?
369 * Return null if no such class exists.
370 * @param c The class which is the subclass or is contained in it.
371 * @param base The base class
372 */
373 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
374 while (c != null && !c.isSubClass(base, types)) {
375 c = c.owner.enclClass();
376 }
377 return c != null;
378 }
379
380 boolean isAccessible(Env<AttrContext> env, Type t) {
381 return isAccessible(env, t, false);
382 }
383
384 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
385 if (t.hasTag(ARRAY)) {
386 return isAccessible(env, types.cvarUpperBound(types.elemtype(t)));
387 } else if (t.isUnion()) {
388 return StreamSupport.stream(((UnionClassType) t).getAlternativeTypes().spliterator(), false)
389 .allMatch(alternative -> isAccessible(env, alternative.tsym, checkInner));
390 } else {
391 return isAccessible(env, t.tsym, checkInner);
392 }
393 }
394
395 /** Is symbol accessible as a member of given type in given environment?
396 * @param env The current environment.
397 * @param site The type of which the tested symbol is regarded
398 * as a member.
399 * @param sym The symbol.
400 */
401 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
402 return isAccessible(env, site, sym, false);
403 }
404 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
405 if (sym.name == names.init && sym.owner != site.tsym) return false;
406
407 /* 15.9.5.1: Note that it is possible for the signature of the anonymous constructor
408 to refer to an inaccessible type
409 */
410 if (env.enclMethod != null && (env.enclMethod.mods.flags & ANONCONSTR) != 0)
411 return true;
412
413 if (env.info.visitingServiceImplementation &&
414 env.toplevel.modle == sym.packge().modle) {
415 return true;
416 }
417
418 switch ((short)(sym.flags() & AccessFlags)) {
419 case PRIVATE:
420 return
421 (env.enclClass.sym == sym.owner // fast special case
422 ||
423 env.enclClass.sym.outermostClass() ==
424 sym.owner.outermostClass())
425 &&
426 sym.isInheritedIn(site.tsym, types);
427 case 0:
428 return
429 (env.toplevel.packge == sym.owner.owner // fast special case
430 ||
431 env.toplevel.packge == sym.packge())
432 &&
433 isAccessible(env, site, checkInner)
434 &&
435 sym.isInheritedIn(site.tsym, types)
436 &&
437 notOverriddenIn(site, sym);
438 case PROTECTED:
439 return
440 (env.toplevel.packge == sym.owner.owner // fast special case
441 ||
442 env.toplevel.packge == sym.packge()
443 ||
444 isProtectedAccessible(sym, env.enclClass.sym, site)
445 ||
446 // OK to select instance method or field from 'super' or type name
447 // (but type names should be disallowed elsewhere!)
448 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
449 &&
450 isAccessible(env, site, checkInner)
451 &&
452 notOverriddenIn(site, sym);
453 default: // this case includes erroneous combinations as well
454 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
455 }
456 }
457 //where
458 /* `sym' is accessible only if not overridden by
459 * another symbol which is a member of `site'
460 * (because, if it is overridden, `sym' is not strictly
461 * speaking a member of `site'). A polymorphic signature method
462 * cannot be overridden (e.g. MH.invokeExact(Object[])).
463 */
464 private boolean notOverriddenIn(Type site, Symbol sym) {
465 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
466 return true;
467 else {
468 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
469 return (s2 == null || s2 == sym || sym.owner == s2.owner || (sym.owner.isInterface() && s2.owner == syms.objectType.tsym) ||
470 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
471 }
472 }
473 //where
474 /** Is given protected symbol accessible if it is selected from given site
475 * and the selection takes place in given class?
476 * @param sym The symbol with protected access
477 * @param c The class where the access takes place
478 * @param site The type of the qualifier
479 */
480 private
481 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
482 Type newSite = site.hasTag(TYPEVAR) ? site.getUpperBound() : site;
483 while (c != null &&
484 !(c.isSubClass(sym.owner, types) &&
485 (c.flags() & INTERFACE) == 0 &&
486 // In JLS 2e 6.6.2.1, the subclass restriction applies
487 // only to instance fields and methods -- types are excluded
488 // regardless of whether they are declared 'static' or not.
489 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || newSite.tsym.isSubClass(c, types))))
490 c = c.owner.enclClass();
491 return c != null;
492 }
493
494 /**
495 * Performs a recursive scan of a type looking for accessibility problems
496 * from current attribution environment
497 */
498 void checkAccessibleType(Env<AttrContext> env, Type t) {
499 accessibilityChecker.visit(t, env);
500 }
501
502 /**
503 * Accessibility type-visitor
504 */
505 Types.SimpleVisitor<Void, Env<AttrContext>> accessibilityChecker =
506 new Types.SimpleVisitor<Void, Env<AttrContext>>() {
507
508 void visit(List<Type> ts, Env<AttrContext> env) {
509 for (Type t : ts) {
510 visit(t, env);
511 }
512 }
513
514 public Void visitType(Type t, Env<AttrContext> env) {
515 return null;
516 }
517
518 @Override
519 public Void visitArrayType(ArrayType t, Env<AttrContext> env) {
520 visit(t.elemtype, env);
521 return null;
522 }
523
524 @Override
525 public Void visitClassType(ClassType t, Env<AttrContext> env) {
526 visit(t.getTypeArguments(), env);
527 if (!isAccessible(env, t, true)) {
528 accessBase(new AccessError(env, null, t.tsym), env.tree.pos(), env.enclClass.sym, t, t.tsym.name, true);
529 }
530 return null;
531 }
532
533 @Override
534 public Void visitWildcardType(WildcardType t, Env<AttrContext> env) {
535 visit(t.type, env);
536 return null;
537 }
538
539 @Override
540 public Void visitMethodType(MethodType t, Env<AttrContext> env) {
541 visit(t.getParameterTypes(), env);
542 visit(t.getReturnType(), env);
543 visit(t.getThrownTypes(), env);
544 return null;
545 }
546 };
547
548 /** Try to instantiate the type of a method so that it fits
549 * given type arguments and argument types. If successful, return
550 * the method's instantiated type, else return null.
551 * The instantiation will take into account an additional leading
552 * formal parameter if the method is an instance method seen as a member
553 * of an under determined site. In this case, we treat site as an additional
554 * parameter and the parameters of the class containing the method as
555 * additional type variables that get instantiated.
556 *
557 * @param env The current environment
558 * @param site The type of which the method is a member.
559 * @param m The method symbol.
560 * @param argtypes The invocation's given value arguments.
561 * @param typeargtypes The invocation's given type arguments.
562 * @param allowBoxing Allow boxing conversions of arguments.
563 * @param useVarargs Box trailing arguments into an array for varargs.
564 */
565 Type rawInstantiate(Env<AttrContext> env,
566 Type site,
567 Symbol m,
568 ResultInfo resultInfo,
569 List<Type> argtypes,
570 List<Type> typeargtypes,
571 boolean allowBoxing,
572 boolean useVarargs,
573 Warner warn) throws Infer.InferenceException {
574 Type mt = types.memberType(site, m);
575 // tvars is the list of formal type variables for which type arguments
576 // need to inferred.
577 List<Type> tvars = List.nil();
578 if (typeargtypes == null) typeargtypes = List.nil();
579 if (!mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
580 // This is not a polymorphic method, but typeargs are supplied
581 // which is fine, see JLS 15.12.2.1
582 } else if (mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
583 ForAll pmt = (ForAll) mt;
584 if (typeargtypes.length() != pmt.tvars.length())
585 // not enough args
586 throw new InapplicableMethodException(diags.fragment(Fragments.WrongNumberTypeArgs(Integer.toString(pmt.tvars.length()))));
587 // Check type arguments are within bounds
588 List<Type> formals = pmt.tvars;
589 List<Type> actuals = typeargtypes;
590 while (formals.nonEmpty() && actuals.nonEmpty()) {
591 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
592 pmt.tvars, typeargtypes);
593 for (; bounds.nonEmpty(); bounds = bounds.tail) {
594 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn)) {
595 throw new InapplicableMethodException(diags.fragment(Fragments.ExplicitParamDoNotConformToBounds(actuals.head, bounds)));
596 }
597 }
598 formals = formals.tail;
599 actuals = actuals.tail;
600 }
601 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
602 } else if (mt.hasTag(FORALL)) {
603 ForAll pmt = (ForAll) mt;
604 List<Type> tvars1 = types.newInstances(pmt.tvars);
605 tvars = tvars.appendList(tvars1);
606 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
607 }
608
609 // find out whether we need to go the slow route via infer
610 boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
611 for (List<Type> l = argtypes;
612 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
613 l = l.tail) {
614 if (l.head.hasTag(FORALL)) instNeeded = true;
615 }
616
617 if (instNeeded) {
618 return infer.instantiateMethod(env,
619 tvars,
620 (MethodType)mt,
621 resultInfo,
622 (MethodSymbol)m,
623 argtypes,
624 allowBoxing,
625 useVarargs,
626 currentResolutionContext,
627 warn);
628 }
629
630 DeferredAttr.DeferredAttrContext dc = currentResolutionContext.deferredAttrContext(m, infer.emptyContext, resultInfo, warn);
631 currentResolutionContext.methodCheck.argumentsAcceptable(env, dc,
632 argtypes, mt.getParameterTypes(), warn);
633 dc.complete();
634 return mt;
635 }
636
637 Type checkMethod(Env<AttrContext> env,
638 Type site,
639 Symbol m,
640 ResultInfo resultInfo,
641 List<Type> argtypes,
642 List<Type> typeargtypes,
643 Warner warn) {
644 MethodResolutionContext prevContext = currentResolutionContext;
645 try {
646 currentResolutionContext = new MethodResolutionContext();
647 currentResolutionContext.attrMode = (resultInfo.pt == Infer.anyPoly) ?
648 AttrMode.SPECULATIVE : DeferredAttr.AttrMode.CHECK;
649 if (env.tree.hasTag(JCTree.Tag.REFERENCE)) {
650 //method/constructor references need special check class
651 //to handle inference variables in 'argtypes' (might happen
652 //during an unsticking round)
653 currentResolutionContext.methodCheck =
654 new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
655 }
656 MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
657 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
658 step.isBoxingRequired(), step.isVarargsRequired(), warn);
659 }
660 finally {
661 currentResolutionContext = prevContext;
662 }
663 }
664
665 /** Same but returns null instead throwing a NoInstanceException
666 */
667 Type instantiate(Env<AttrContext> env,
668 Type site,
669 Symbol m,
670 ResultInfo resultInfo,
671 List<Type> argtypes,
672 List<Type> typeargtypes,
673 boolean allowBoxing,
674 boolean useVarargs,
675 Warner warn) {
676 try {
677 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
678 allowBoxing, useVarargs, warn);
679 } catch (InapplicableMethodException ex) {
680 return null;
681 }
682 }
683
684 /**
685 * This interface defines an entry point that should be used to perform a
686 * method check. A method check usually consist in determining as to whether
687 * a set of types (actuals) is compatible with another set of types (formals).
688 * Since the notion of compatibility can vary depending on the circumstances,
689 * this interfaces allows to easily add new pluggable method check routines.
690 */
691 interface MethodCheck {
692 /**
693 * Main method check routine. A method check usually consist in determining
694 * as to whether a set of types (actuals) is compatible with another set of
695 * types (formals). If an incompatibility is found, an unchecked exception
696 * is assumed to be thrown.
697 */
698 void argumentsAcceptable(Env<AttrContext> env,
699 DeferredAttrContext deferredAttrContext,
700 List<Type> argtypes,
701 List<Type> formals,
702 Warner warn);
703
704 /**
705 * Retrieve the method check object that will be used during a
706 * most specific check.
707 */
708 MethodCheck mostSpecificCheck(List<Type> actuals);
709 }
710
711 /**
712 * Helper enum defining all method check diagnostics (used by resolveMethodCheck).
713 */
714 enum MethodCheckDiag {
715 /**
716 * Actuals and formals differs in length.
717 */
718 ARITY_MISMATCH("arg.length.mismatch", "infer.arg.length.mismatch"),
719 /**
720 * An actual is incompatible with a formal.
721 */
722 ARG_MISMATCH("no.conforming.assignment.exists", "infer.no.conforming.assignment.exists"),
723 /**
724 * An actual is incompatible with the varargs element type.
725 */
726 VARARG_MISMATCH("varargs.argument.mismatch", "infer.varargs.argument.mismatch"),
727 /**
728 * The varargs element type is inaccessible.
729 */
730 INACCESSIBLE_VARARGS("inaccessible.varargs.type", "inaccessible.varargs.type");
731
732 final String basicKey;
733 final String inferKey;
734
735 MethodCheckDiag(String basicKey, String inferKey) {
736 this.basicKey = basicKey;
737 this.inferKey = inferKey;
738 }
739
740 String regex() {
741 return String.format("([a-z]*\\.)*(%s|%s)", basicKey, inferKey);
742 }
743 }
744
745 /**
746 * Dummy method check object. All methods are deemed applicable, regardless
747 * of their formal parameter types.
748 */
749 MethodCheck nilMethodCheck = new MethodCheck() {
750 public void argumentsAcceptable(Env<AttrContext> env, DeferredAttrContext deferredAttrContext, List<Type> argtypes, List<Type> formals, Warner warn) {
751 //do nothing - method always applicable regardless of actuals
752 }
753
754 public MethodCheck mostSpecificCheck(List<Type> actuals) {
755 return this;
756 }
757 };
758
759 /**
760 * Base class for 'real' method checks. The class defines the logic for
761 * iterating through formals and actuals and provides and entry point
762 * that can be used by subclasses in order to define the actual check logic.
763 */
764 abstract class AbstractMethodCheck implements MethodCheck {
765 @Override
766 public void argumentsAcceptable(final Env<AttrContext> env,
767 DeferredAttrContext deferredAttrContext,
768 List<Type> argtypes,
769 List<Type> formals,
770 Warner warn) {
771 //should we expand formals?
772 boolean useVarargs = deferredAttrContext.phase.isVarargsRequired();
773 JCTree callTree = treeForDiagnostics(env);
774 List<JCExpression> trees = TreeInfo.args(callTree);
775
776 //inference context used during this method check
777 InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
778
779 Type varargsFormal = useVarargs ? formals.last() : null;
780
781 if (varargsFormal == null &&
782 argtypes.size() != formals.size()) {
783 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
784 }
785
786 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
787 DiagnosticPosition pos = trees != null ? trees.head : null;
788 checkArg(pos, false, argtypes.head, formals.head, deferredAttrContext, warn);
789 argtypes = argtypes.tail;
790 formals = formals.tail;
791 trees = trees != null ? trees.tail : trees;
792 }
793
794 if (formals.head != varargsFormal) {
795 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
796 }
797
798 if (useVarargs) {
799 //note: if applicability check is triggered by most specific test,
800 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
801 final Type elt = types.elemtype(varargsFormal);
802 while (argtypes.nonEmpty()) {
803 DiagnosticPosition pos = trees != null ? trees.head : null;
804 checkArg(pos, true, argtypes.head, elt, deferredAttrContext, warn);
805 argtypes = argtypes.tail;
806 trees = trees != null ? trees.tail : trees;
807 }
808 }
809 }
810
811 // where
812 private JCTree treeForDiagnostics(Env<AttrContext> env) {
813 return env.info.preferredTreeForDiagnostics != null ? env.info.preferredTreeForDiagnostics : env.tree;
814 }
815
816 /**
817 * Does the actual argument conforms to the corresponding formal?
818 */
819 abstract void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn);
820
821 protected void reportMC(DiagnosticPosition pos, MethodCheckDiag diag, InferenceContext inferenceContext, Object... args) {
822 boolean inferDiag = inferenceContext != infer.emptyContext;
823 if (inferDiag && (!diag.inferKey.equals(diag.basicKey))) {
824 Object[] args2 = new Object[args.length + 1];
825 System.arraycopy(args, 0, args2, 1, args.length);
826 args2[0] = inferenceContext.inferenceVars();
827 args = args2;
828 }
829 String key = inferDiag ? diag.inferKey : diag.basicKey;
830 throw inferDiag ?
831 infer.error(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args)) :
832 methodCheckFailure.setMessage(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args));
833 }
834
835 /**
836 * To eliminate the overhead associated with allocating an exception object in such an
837 * hot execution path, we use flyweight pattern - and share the same exception instance
838 * across multiple method check failures.
839 */
840 class SharedInapplicableMethodException extends InapplicableMethodException {
841 private static final long serialVersionUID = 0;
842
843 SharedInapplicableMethodException() {
844 super(null);
845 }
846
847 SharedInapplicableMethodException setMessage(JCDiagnostic details) {
848 this.diagnostic = details;
849 return this;
850 }
851 }
852
853 SharedInapplicableMethodException methodCheckFailure = new SharedInapplicableMethodException();
854
855 public MethodCheck mostSpecificCheck(List<Type> actuals) {
856 return nilMethodCheck;
857 }
858
859 }
860
861 /**
862 * Arity-based method check. A method is applicable if the number of actuals
863 * supplied conforms to the method signature.
864 */
865 MethodCheck arityMethodCheck = new AbstractMethodCheck() {
866 @Override
867 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
868 //do nothing - actual always compatible to formals
869 }
870
871 @Override
872 public String toString() {
873 return "arityMethodCheck";
874 }
875 };
876
877 /**
878 * Main method applicability routine. Given a list of actual types A,
879 * a list of formal types F, determines whether the types in A are
880 * compatible (by method invocation conversion) with the types in F.
881 *
882 * Since this routine is shared between overload resolution and method
883 * type-inference, a (possibly empty) inference context is used to convert
884 * formal types to the corresponding 'undet' form ahead of a compatibility
885 * check so that constraints can be propagated and collected.
886 *
887 * Moreover, if one or more types in A is a deferred type, this routine uses
888 * DeferredAttr in order to perform deferred attribution. If one or more actual
889 * deferred types are stuck, they are placed in a queue and revisited later
890 * after the remainder of the arguments have been seen. If this is not sufficient
891 * to 'unstuck' the argument, a cyclic inference error is called out.
892 *
893 * A method check handler (see above) is used in order to report errors.
894 */
895 MethodCheck resolveMethodCheck = new AbstractMethodCheck() {
896
897 @Override
898 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
899 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
900 mresult.check(pos, actual);
901 }
902
903 @Override
904 public void argumentsAcceptable(final Env<AttrContext> env,
905 DeferredAttrContext deferredAttrContext,
906 List<Type> argtypes,
907 List<Type> formals,
908 Warner warn) {
909 super.argumentsAcceptable(env, deferredAttrContext, argtypes, formals, warn);
910 // should we check varargs element type accessibility?
911 if (deferredAttrContext.phase.isVarargsRequired()) {
912 if (deferredAttrContext.mode == AttrMode.CHECK) {
913 varargsAccessible(env, types.elemtype(formals.last()), deferredAttrContext.inferenceContext);
914 }
915 }
916 }
917
918 /**
919 * Test that the runtime array element type corresponding to 't' is accessible. 't' should be the
920 * varargs element type of either the method invocation type signature (after inference completes)
921 * or the method declaration signature (before inference completes).
922 */
923 private void varargsAccessible(final Env<AttrContext> env, final Type t, final InferenceContext inferenceContext) {
924 if (inferenceContext.free(t)) {
925 inferenceContext.addFreeTypeListener(List.of(t),
926 solvedContext -> varargsAccessible(env, solvedContext.asInstType(t), solvedContext));
927 } else {
928 if (!isAccessible(env, types.erasure(t))) {
929 Symbol location = env.enclClass.sym;
930 reportMC(env.tree, MethodCheckDiag.INACCESSIBLE_VARARGS, inferenceContext, t, Kinds.kindName(location), location);
931 }
932 }
933 }
934
935 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
936 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
937 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
938 MethodCheckDiag methodDiag = varargsCheck ?
939 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
940
941 @Override
942 public void report(DiagnosticPosition pos, JCDiagnostic details) {
943 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
944 }
945 };
946 return new MethodResultInfo(to, checkContext);
947 }
948
949 @Override
950 public MethodCheck mostSpecificCheck(List<Type> actuals) {
951 return new MostSpecificCheck(actuals);
952 }
953
954 @Override
955 public String toString() {
956 return "resolveMethodCheck";
957 }
958 };
959
960 /**
961 * This class handles method reference applicability checks; since during
962 * these checks it's sometime possible to have inference variables on
963 * the actual argument types list, the method applicability check must be
964 * extended so that inference variables are 'opened' as needed.
965 */
966 class MethodReferenceCheck extends AbstractMethodCheck {
967
968 InferenceContext pendingInferenceContext;
969
970 MethodReferenceCheck(InferenceContext pendingInferenceContext) {
971 this.pendingInferenceContext = pendingInferenceContext;
972 }
973
974 @Override
975 void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
976 ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
977 mresult.check(pos, actual);
978 }
979
980 private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
981 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
982 CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
983 MethodCheckDiag methodDiag = varargsCheck ?
984 MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
985
986 @Override
987 public boolean compatible(Type found, Type req, Warner warn) {
988 found = pendingInferenceContext.asUndetVar(found);
989 if (found.hasTag(UNDETVAR) && req.isPrimitive()) {
990 req = types.boxedClass(req).type;
991 }
992 return super.compatible(found, req, warn);
993 }
994
995 @Override
996 public void report(DiagnosticPosition pos, JCDiagnostic details) {
997 reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
998 }
999 };
1000 return new MethodResultInfo(to, checkContext);
1001 }
1002
1003 @Override
1004 public MethodCheck mostSpecificCheck(List<Type> actuals) {
1005 return new MostSpecificCheck(actuals);
1006 }
1007
1008 @Override
1009 public String toString() {
1010 return "MethodReferenceCheck";
1011 }
1012 }
1013
1014 /**
1015 * Check context to be used during method applicability checks. A method check
1016 * context might contain inference variables.
1017 */
1018 abstract class MethodCheckContext implements CheckContext {
1019
1020 boolean strict;
1021 DeferredAttrContext deferredAttrContext;
1022 Warner rsWarner;
1023
1024 public MethodCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
1025 this.strict = strict;
1026 this.deferredAttrContext = deferredAttrContext;
1027 this.rsWarner = rsWarner;
1028 }
1029
1030 public boolean compatible(Type found, Type req, Warner warn) {
1031 InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
1032 return strict ?
1033 types.isSubtypeUnchecked(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn) :
1034 types.isConvertible(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn);
1035 }
1036
1037 public void report(DiagnosticPosition pos, JCDiagnostic details) {
1038 throw new InapplicableMethodException(details);
1039 }
1040
1041 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
1042 return rsWarner;
1043 }
1044
1045 public InferenceContext inferenceContext() {
1046 return deferredAttrContext.inferenceContext;
1047 }
1048
1049 public DeferredAttrContext deferredAttrContext() {
1050 return deferredAttrContext;
1051 }
1052
1053 @Override
1054 public String toString() {
1055 return "MethodCheckContext";
1056 }
1057 }
1058
1059 /**
1060 * ResultInfo class to be used during method applicability checks. Check
1061 * for deferred types goes through special path.
1062 */
1063 class MethodResultInfo extends ResultInfo {
1064
1065 public MethodResultInfo(Type pt, CheckContext checkContext) {
1066 attr.super(KindSelector.VAL, pt, checkContext);
1067 }
1068
1069 @Override
1070 protected Type check(DiagnosticPosition pos, Type found) {
1071 if (found.hasTag(DEFERRED)) {
1072 DeferredType dt = (DeferredType)found;
1073 return dt.check(this);
1074 } else {
1075 Type uResult = U(found);
1076 Type capturedType = pos == null || pos.getTree() == null ?
1077 types.capture(uResult) :
1078 checkContext.inferenceContext()
1079 .cachedCapture(pos.getTree(), uResult, true);
1080 return super.check(pos, chk.checkNonVoid(pos, capturedType));
1081 }
1082 }
1083
1084 /**
1085 * javac has a long-standing 'simplification' (see 6391995):
1086 * given an actual argument type, the method check is performed
1087 * on its upper bound. This leads to inconsistencies when an
1088 * argument type is checked against itself. For example, given
1089 * a type-variable T, it is not true that {@code U(T) <: T},
1090 * so we need to guard against that.
1091 */
1092 private Type U(Type found) {
1093 return found == pt ?
1094 found : types.cvarUpperBound(found);
1095 }
1096
1097 @Override
1098 protected MethodResultInfo dup(Type newPt) {
1099 return new MethodResultInfo(newPt, checkContext);
1100 }
1101
1102 @Override
1103 protected ResultInfo dup(CheckContext newContext) {
1104 return new MethodResultInfo(pt, newContext);
1105 }
1106
1107 @Override
1108 protected ResultInfo dup(Type newPt, CheckContext newContext) {
1109 return new MethodResultInfo(newPt, newContext);
1110 }
1111 }
1112
1113 /**
1114 * Most specific method applicability routine. Given a list of actual types A,
1115 * a list of formal types F1, and a list of formal types F2, the routine determines
1116 * as to whether the types in F1 can be considered more specific than those in F2 w.r.t.
1117 * argument types A.
1118 */
1119 class MostSpecificCheck implements MethodCheck {
1120
1121 List<Type> actuals;
1122
1123 MostSpecificCheck(List<Type> actuals) {
1124 this.actuals = actuals;
1125 }
1126
1127 @Override
1128 public void argumentsAcceptable(final Env<AttrContext> env,
1129 DeferredAttrContext deferredAttrContext,
1130 List<Type> formals1,
1131 List<Type> formals2,
1132 Warner warn) {
1133 formals2 = adjustArgs(formals2, deferredAttrContext.msym, formals1.length(), deferredAttrContext.phase.isVarargsRequired());
1134 while (formals2.nonEmpty()) {
1135 ResultInfo mresult = methodCheckResult(formals2.head, deferredAttrContext, warn, actuals.head);
1136 mresult.check(null, formals1.head);
1137 formals1 = formals1.tail;
1138 formals2 = formals2.tail;
1139 actuals = actuals.isEmpty() ? actuals : actuals.tail;
1140 }
1141 }
1142
1143 /**
1144 * Create a method check context to be used during the most specific applicability check
1145 */
1146 ResultInfo methodCheckResult(Type to, DeferredAttr.DeferredAttrContext deferredAttrContext,
1147 Warner rsWarner, Type actual) {
1148 return attr.new ResultInfo(KindSelector.VAL, to,
1149 new MostSpecificCheckContext(deferredAttrContext, rsWarner, actual));
1150 }
1151
1152 /**
1153 * Subclass of method check context class that implements most specific
1154 * method conversion. If the actual type under analysis is a deferred type
1155 * a full blown structural analysis is carried out.
1156 */
1157 class MostSpecificCheckContext extends MethodCheckContext {
1158
1159 Type actual;
1160
1161 public MostSpecificCheckContext(DeferredAttrContext deferredAttrContext, Warner rsWarner, Type actual) {
1162 super(true, deferredAttrContext, rsWarner);
1163 this.actual = actual;
1164 }
1165
1166 public boolean compatible(Type found, Type req, Warner warn) {
1167 if (unrelatedFunctionalInterfaces(found, req) &&
1168 (actual != null && actual.getTag() == DEFERRED)) {
1169 DeferredType dt = (DeferredType) actual;
1170 JCTree speculativeTree = dt.speculativeTree(deferredAttrContext);
1171 if (speculativeTree != deferredAttr.stuckTree) {
1172 return functionalInterfaceMostSpecific(found, req, speculativeTree);
1173 }
1174 }
1175 return compatibleBySubtyping(found, req);
1176 }
1177
1178 private boolean compatibleBySubtyping(Type found, Type req) {
1179 if (!strict && found.isPrimitive() != req.isPrimitive()) {
1180 found = found.isPrimitive() ? types.boxedClass(found).type : types.unboxedType(found);
1181 }
1182 return types.isSubtypeNoCapture(found, deferredAttrContext.inferenceContext.asUndetVar(req));
1183 }
1184
1185 /** Whether {@code t} and {@code s} are unrelated functional interface types. */
1186 private boolean unrelatedFunctionalInterfaces(Type t, Type s) {
1187 return types.isFunctionalInterface(t.tsym) &&
1188 types.isFunctionalInterface(s.tsym) &&
1189 unrelatedInterfaces(t, s);
1190 }
1191
1192 /** Whether {@code t} and {@code s} are unrelated interface types; recurs on intersections. **/
1193 private boolean unrelatedInterfaces(Type t, Type s) {
1194 if (t.isCompound()) {
1195 for (Type ti : types.interfaces(t)) {
1196 if (!unrelatedInterfaces(ti, s)) {
1197 return false;
1198 }
1199 }
1200 return true;
1201 } else if (s.isCompound()) {
1202 for (Type si : types.interfaces(s)) {
1203 if (!unrelatedInterfaces(t, si)) {
1204 return false;
1205 }
1206 }
1207 return true;
1208 } else {
1209 return types.asSuper(t, s.tsym) == null && types.asSuper(s, t.tsym) == null;
1210 }
1211 }
1212
1213 /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
1214 private boolean functionalInterfaceMostSpecific(Type t, Type s, JCTree tree) {
1215 Type tDesc = types.findDescriptorType(types.capture(t));
1216 Type tDescNoCapture = types.findDescriptorType(t);
1217 Type sDesc = types.findDescriptorType(s);
1218 final List<Type> tTypeParams = tDesc.getTypeArguments();
1219 final List<Type> tTypeParamsNoCapture = tDescNoCapture.getTypeArguments();
1220 final List<Type> sTypeParams = sDesc.getTypeArguments();
1221
1222 // compare type parameters
1223 if (tDesc.hasTag(FORALL) && !types.hasSameBounds((ForAll) tDesc, (ForAll) tDescNoCapture)) {
1224 return false;
1225 }
1226 // can't use Types.hasSameBounds on sDesc because bounds may have ivars
1227 List<Type> tIter = tTypeParams;
1228 List<Type> sIter = sTypeParams;
1229 while (tIter.nonEmpty() && sIter.nonEmpty()) {
1230 Type tBound = tIter.head.getUpperBound();
1231 Type sBound = types.subst(sIter.head.getUpperBound(), sTypeParams, tTypeParams);
1232 if (tBound.containsAny(tTypeParams) && inferenceContext().free(sBound)) {
1233 return false;
1234 }
1235 if (!types.isSameType(tBound, inferenceContext().asUndetVar(sBound))) {
1236 return false;
1237 }
1238 tIter = tIter.tail;
1239 sIter = sIter.tail;
1240 }
1241 if (!tIter.isEmpty() || !sIter.isEmpty()) {
1242 return false;
1243 }
1244
1245 // compare parameters
1246 List<Type> tParams = tDesc.getParameterTypes();
1247 List<Type> tParamsNoCapture = tDescNoCapture.getParameterTypes();
1248 List<Type> sParams = sDesc.getParameterTypes();
1249 while (tParams.nonEmpty() && tParamsNoCapture.nonEmpty() && sParams.nonEmpty()) {
1250 Type tParam = tParams.head;
1251 Type tParamNoCapture = types.subst(tParamsNoCapture.head, tTypeParamsNoCapture, tTypeParams);
1252 Type sParam = types.subst(sParams.head, sTypeParams, tTypeParams);
1253 if (tParam.containsAny(tTypeParams) && inferenceContext().free(sParam)) {
1254 return false;
1255 }
1256 if (!types.isSubtype(inferenceContext().asUndetVar(sParam), tParam)) {
1257 return false;
1258 }
1259 if (!types.isSameType(tParamNoCapture, inferenceContext().asUndetVar(sParam))) {
1260 return false;
1261 }
1262 tParams = tParams.tail;
1263 tParamsNoCapture = tParamsNoCapture.tail;
1264 sParams = sParams.tail;
1265 }
1266 if (!tParams.isEmpty() || !tParamsNoCapture.isEmpty() || !sParams.isEmpty()) {
1267 return false;
1268 }
1269
1270 // compare returns
1271 Type tRet = tDesc.getReturnType();
1272 Type sRet = types.subst(sDesc.getReturnType(), sTypeParams, tTypeParams);
1273 if (tRet.containsAny(tTypeParams) && inferenceContext().free(sRet)) {
1274 return false;
1275 }
1276 MostSpecificFunctionReturnChecker msc = new MostSpecificFunctionReturnChecker(tRet, sRet);
1277 msc.scan(tree);
1278 return msc.result;
1279 }
1280
1281 /**
1282 * Tests whether one functional interface type can be considered more specific
1283 * than another unrelated functional interface type for the scanned expression.
1284 */
1285 class MostSpecificFunctionReturnChecker extends DeferredAttr.PolyScanner {
1286
1287 final Type tRet;
1288 final Type sRet;
1289 boolean result;
1290
1291 /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
1292 MostSpecificFunctionReturnChecker(Type tRet, Type sRet) {
1293 this.tRet = tRet;
1294 this.sRet = sRet;
1295 result = true;
1296 }
1297
1298 @Override
1299 void skip(JCTree tree) {
1300 result = false;
1301 }
1302
1303 @Override
1304 public void visitConditional(JCConditional tree) {
1305 scan(asExpr(tree.truepart));
1306 scan(asExpr(tree.falsepart));
1307 }
1308
1309 @Override
1310 public void visitReference(JCMemberReference tree) {
1311 if (sRet.hasTag(VOID)) {
1312 // do nothing
1313 } else if (tRet.hasTag(VOID)) {
1314 result = false;
1315 } else if (tRet.isPrimitive() != sRet.isPrimitive()) {
1316 boolean retValIsPrimitive =
1317 tree.refPolyKind == PolyKind.STANDALONE &&
1318 tree.sym.type.getReturnType().isPrimitive();
1319 result &= (retValIsPrimitive == tRet.isPrimitive()) &&
1320 (retValIsPrimitive != sRet.isPrimitive());
1321 } else {
1322 result &= compatibleBySubtyping(tRet, sRet);
1323 }
1324 }
1325
1326 @Override
1327 public void visitParens(JCParens tree) {
1328 scan(asExpr(tree.expr));
1329 }
1330
1331 @Override
1332 public void visitLambda(JCLambda tree) {
1333 if (sRet.hasTag(VOID)) {
1334 // do nothing
1335 } else if (tRet.hasTag(VOID)) {
1336 result = false;
1337 } else {
1338 List<JCExpression> lambdaResults = lambdaResults(tree);
1339 if (!lambdaResults.isEmpty() && unrelatedFunctionalInterfaces(tRet, sRet)) {
1340 for (JCExpression expr : lambdaResults) {
1341 result &= functionalInterfaceMostSpecific(tRet, sRet, expr);
1342 }
1343 } else if (!lambdaResults.isEmpty() && tRet.isPrimitive() != sRet.isPrimitive()) {
1344 for (JCExpression expr : lambdaResults) {
1345 boolean retValIsPrimitive = expr.isStandalone() && expr.type.isPrimitive();
1346 result &= (retValIsPrimitive == tRet.isPrimitive()) &&
1347 (retValIsPrimitive != sRet.isPrimitive());
1348 }
1349 } else {
1350 result &= compatibleBySubtyping(tRet, sRet);
1351 }
1352 }
1353 }
1354 //where
1355
1356 private List<JCExpression> lambdaResults(JCLambda lambda) {
1357 if (lambda.getBodyKind() == JCTree.JCLambda.BodyKind.EXPRESSION) {
1358 return List.of(asExpr((JCExpression) lambda.body));
1359 } else {
1360 final ListBuffer<JCExpression> buffer = new ListBuffer<>();
1361 DeferredAttr.LambdaReturnScanner lambdaScanner =
1362 new DeferredAttr.LambdaReturnScanner() {
1363 @Override
1364 public void visitReturn(JCReturn tree) {
1365 if (tree.expr != null) {
1366 buffer.append(asExpr(tree.expr));
1367 }
1368 }
1369 };
1370 lambdaScanner.scan(lambda.body);
1371 return buffer.toList();
1372 }
1373 }
1374
1375 private JCExpression asExpr(JCExpression expr) {
1376 if (expr.type.hasTag(DEFERRED)) {
1377 JCTree speculativeTree = ((DeferredType)expr.type).speculativeTree(deferredAttrContext);
1378 if (speculativeTree != deferredAttr.stuckTree) {
1379 expr = (JCExpression)speculativeTree;
1380 }
1381 }
1382 return expr;
1383 }
1384 }
1385
1386 }
1387
1388 public MethodCheck mostSpecificCheck(List<Type> actuals) {
1389 Assert.error("Cannot get here!");
1390 return null;
1391 }
1392 }
1393
1394 public static class InapplicableMethodException extends RuntimeException {
1395 private static final long serialVersionUID = 0;
1396
1397 transient JCDiagnostic diagnostic;
1398
1399 InapplicableMethodException(JCDiagnostic diag) {
1400 this.diagnostic = diag;
1401 }
1402
1403 public JCDiagnostic getDiagnostic() {
1404 return diagnostic;
1405 }
1406
1407 @Override
1408 public Throwable fillInStackTrace() {
1409 // This is an internal exception; the stack trace is irrelevant.
1410 return this;
1411 }
1412 }
1413
1414 /* ***************************************************************************
1415 * Symbol lookup
1416 * the following naming conventions for arguments are used
1417 *
1418 * env is the environment where the symbol was mentioned
1419 * site is the type of which the symbol is a member
1420 * name is the symbol's name
1421 * if no arguments are given
1422 * argtypes are the value arguments, if we search for a method
1423 *
1424 * If no symbol was found, a ResolveError detailing the problem is returned.
1425 ****************************************************************************/
1426
1427 /** Find field. Synthetic fields are always skipped.
1428 * @param env The current environment.
1429 * @param site The original type from where the selection takes place.
1430 * @param name The name of the field.
1431 * @param c The class to search for the field. This is always
1432 * a superclass or implemented interface of site's class.
1433 */
1434 Symbol findField(Env<AttrContext> env,
1435 Type site,
1436 Name name,
1437 TypeSymbol c) {
1438 while (c.type.hasTag(TYPEVAR))
1439 c = c.type.getUpperBound().tsym;
1440 Symbol bestSoFar = varNotFound;
1441 Symbol sym;
1442 for (Symbol s : c.members().getSymbolsByName(name)) {
1443 if (s.kind == VAR && (s.flags_field & SYNTHETIC) == 0) {
1444 return isAccessible(env, site, s)
1445 ? s : new AccessError(env, site, s);
1446 }
1447 }
1448 Type st = types.supertype(c.type);
1449 if (st != null && (st.hasTag(CLASS) || st.hasTag(TYPEVAR))) {
1450 sym = findField(env, site, name, st.tsym);
1451 bestSoFar = bestOf(bestSoFar, sym);
1452 }
1453 for (List<Type> l = types.interfaces(c.type);
1454 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1455 l = l.tail) {
1456 sym = findField(env, site, name, l.head.tsym);
1457 if (bestSoFar.exists() && sym.exists() &&
1458 sym.owner != bestSoFar.owner)
1459 bestSoFar = new AmbiguityError(bestSoFar, sym);
1460 else
1461 bestSoFar = bestOf(bestSoFar, sym);
1462 }
1463 return bestSoFar;
1464 }
1465
1466 /** Resolve a field identifier, throw a fatal error if not found.
1467 * @param pos The position to use for error reporting.
1468 * @param env The environment current at the method invocation.
1469 * @param site The type of the qualifying expression, in which
1470 * identifier is searched.
1471 * @param name The identifier's name.
1472 */
1473 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
1474 Type site, Name name) {
1475 Symbol sym = findField(env, site, name, site.tsym);
1476 if (sym.kind == VAR) return (VarSymbol)sym;
1477 else throw new FatalError(
1478 diags.fragment(Fragments.FatalErrCantLocateField(name)));
1479 }
1480
1481 /** Find unqualified variable or field with given name.
1482 * Synthetic fields always skipped.
1483 * @param env The current environment.
1484 * @param name The name of the variable or field.
1485 */
1486 Symbol findVar(Env<AttrContext> env, Name name) {
1487 Symbol bestSoFar = varNotFound;
1488 Env<AttrContext> env1 = env;
1489 boolean staticOnly = false;
1490 while (env1.outer != null) {
1491 Symbol sym = null;
1492 for (Symbol s : env1.info.scope.getSymbolsByName(name)) {
1493 if (s.kind == VAR && (s.flags_field & SYNTHETIC) == 0) {
1494 sym = s;
1495 if (staticOnly) {
1496 return new StaticError(sym);
1497 }
1498 break;
1499 }
1500 }
1501 if (isStatic(env1)) staticOnly = true;
1502 if (sym == null) {
1503 sym = findField(env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
1504 }
1505 if (sym.exists()) {
1506 if (sym.kind == VAR &&
1507 sym.owner.kind == TYP &&
1508 (sym.flags() & STATIC) == 0) {
1509 if (staticOnly)
1510 return new StaticError(sym);
1511 if (env1.info.ctorPrologue && (sym.flags_field & SYNTHETIC) == 0)
1512 return new RefBeforeCtorCalledError(sym);
1513 }
1514 return sym;
1515 } else {
1516 bestSoFar = bestOf(bestSoFar, sym);
1517 }
1518
1519 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1520 env1 = env1.outer;
1521 }
1522
1523 Symbol sym = findField(env, syms.predefClass.type, name, syms.predefClass);
1524 if (sym.exists())
1525 return sym;
1526 if (bestSoFar.exists())
1527 return bestSoFar;
1528
1529 Symbol origin = null;
1530 for (Scope sc : new Scope[] { env.toplevel.namedImportScope, env.toplevel.starImportScope }) {
1531 for (Symbol currentSymbol : sc.getSymbolsByName(name)) {
1532 if (currentSymbol.kind != VAR)
1533 continue;
1534 // invariant: sym.kind == Symbol.Kind.VAR
1535 if (!bestSoFar.kind.isResolutionError() &&
1536 currentSymbol.owner != bestSoFar.owner)
1537 return new AmbiguityError(bestSoFar, currentSymbol);
1538 else if (!bestSoFar.kind.betterThan(VAR)) {
1539 origin = sc.getOrigin(currentSymbol).owner;
1540 bestSoFar = isAccessible(env, origin.type, currentSymbol)
1541 ? currentSymbol : new AccessError(env, origin.type, currentSymbol);
1542 }
1543 }
1544 if (bestSoFar.exists()) break;
1545 }
1546 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
1547 return bestSoFar.clone(origin);
1548 else
1549 return bestSoFar;
1550 }
1551
1552 Warner noteWarner = new Warner();
1553
1554 /** Select the best method for a call site among two choices.
1555 * @param env The current environment.
1556 * @param site The original type from where the
1557 * selection takes place.
1558 * @param argtypes The invocation's value arguments,
1559 * @param typeargtypes The invocation's type arguments,
1560 * @param sym Proposed new best match.
1561 * @param bestSoFar Previously found best match.
1562 * @param allowBoxing Allow boxing conversions of arguments.
1563 * @param useVarargs Box trailing arguments into an array for varargs.
1564 */
1565 @SuppressWarnings("fallthrough")
1566 Symbol selectBest(Env<AttrContext> env,
1567 Type site,
1568 List<Type> argtypes,
1569 List<Type> typeargtypes,
1570 Symbol sym,
1571 Symbol bestSoFar,
1572 boolean allowBoxing,
1573 boolean useVarargs) {
1574 if (sym.kind == ERR ||
1575 (site.tsym != sym.owner && !sym.isInheritedIn(site.tsym, types)) ||
1576 !notOverriddenIn(site, sym)) {
1577 return bestSoFar;
1578 } else if (useVarargs && (sym.flags() & VARARGS) == 0) {
1579 return bestSoFar.kind.isResolutionError() ?
1580 new BadVarargsMethod((ResolveError)bestSoFar.baseSymbol()) :
1581 bestSoFar;
1582 }
1583 Assert.check(!sym.kind.isResolutionError());
1584 try {
1585 types.noWarnings.clear();
1586 Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
1587 allowBoxing, useVarargs, types.noWarnings);
1588 currentResolutionContext.addApplicableCandidate(sym, mt);
1589 } catch (InapplicableMethodException ex) {
1590 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
1591 // Currently, an InapplicableMethodException occurs.
1592 // If bestSoFar.kind was ABSENT_MTH, return an InapplicableSymbolError(kind is WRONG_MTH).
1593 // If bestSoFar.kind was HIDDEN(AccessError)/WRONG_MTH/WRONG_MTHS, return an InapplicableSymbolsError(kind is WRONG_MTHS).
1594 // See JDK-8255968 for more information.
1595 switch (bestSoFar.kind) {
1596 case ABSENT_MTH:
1597 return new InapplicableSymbolError(currentResolutionContext);
1598 case HIDDEN:
1599 if (bestSoFar instanceof AccessError accessError) {
1600 // Add the JCDiagnostic of previous AccessError to the currentResolutionContext
1601 // and construct InapplicableSymbolsError.
1602 // Intentionally fallthrough.
1603 currentResolutionContext.addInapplicableCandidate(accessError.sym,
1604 accessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes));
1605 } else {
1606 return bestSoFar;
1607 }
1608 case WRONG_MTH:
1609 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1610 default:
1611 return bestSoFar;
1612 }
1613 }
1614 if (!isAccessible(env, site, sym)) {
1615 AccessError curAccessError = new AccessError(env, site, sym);
1616 JCDiagnostic curDiagnostic = curAccessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes);
1617 // Currently, an AccessError occurs.
1618 // If bestSoFar.kind was ABSENT_MTH, return an AccessError(kind is HIDDEN).
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 if (bestSoFar.kind == ABSENT_MTH) {
1622 bestSoFar = curAccessError;
1623 } else if (bestSoFar.kind == WRONG_MTH) {
1624 // Add the JCDiagnostic of current AccessError to the currentResolutionContext
1625 // and construct InapplicableSymbolsError.
1626 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1627 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1628 } else if (bestSoFar.kind == WRONG_MTHS) {
1629 // Add the JCDiagnostic of current AccessError to the currentResolutionContext
1630 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1631 } else if (bestSoFar.kind == HIDDEN && bestSoFar instanceof AccessError accessError) {
1632 // Add the JCDiagnostics of previous and current AccessError to the currentResolutionContext
1633 // and construct InapplicableSymbolsError.
1634 currentResolutionContext.addInapplicableCandidate(accessError.sym,
1635 accessError.getDiagnostic(JCDiagnostic.DiagnosticType.FRAGMENT, null, null, site, null, argtypes, typeargtypes));
1636 currentResolutionContext.addInapplicableCandidate(sym, curDiagnostic);
1637 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1638 }
1639 return bestSoFar;
1640 }
1641 return (bestSoFar.kind.isResolutionError() && bestSoFar.kind != AMBIGUOUS)
1642 ? sym
1643 : mostSpecific(argtypes, sym, bestSoFar, env, site, useVarargs);
1644 }
1645
1646 /* Return the most specific of the two methods for a call,
1647 * given that both are accessible and applicable.
1648 * @param m1 A new candidate for most specific.
1649 * @param m2 The previous most specific candidate.
1650 * @param env The current environment.
1651 * @param site The original type from where the selection
1652 * takes place.
1653 * @param allowBoxing Allow boxing conversions of arguments.
1654 * @param useVarargs Box trailing arguments into an array for varargs.
1655 */
1656 Symbol mostSpecific(List<Type> argtypes, Symbol m1,
1657 Symbol m2,
1658 Env<AttrContext> env,
1659 final Type site,
1660 boolean useVarargs) {
1661 switch (m2.kind) {
1662 case MTH:
1663 if (m1 == m2) return m1;
1664 boolean m1SignatureMoreSpecific =
1665 signatureMoreSpecific(argtypes, env, site, m1, m2, useVarargs);
1666 boolean m2SignatureMoreSpecific =
1667 signatureMoreSpecific(argtypes, env, site, m2, m1, useVarargs);
1668 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
1669 Type mt1 = types.memberType(site, m1);
1670 Type mt2 = types.memberType(site, m2);
1671 if (!types.overrideEquivalent(mt1, mt2))
1672 return ambiguityError(m1, m2);
1673
1674 // same signature; select (a) the non-bridge method, or
1675 // (b) the one that overrides the other, or (c) the concrete
1676 // one, or (d) merge both abstract signatures
1677 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
1678 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
1679
1680 if (m1.baseSymbol() == m2.baseSymbol()) {
1681 // this is the same imported symbol which has been cloned twice.
1682 // Return the first one (either will do).
1683 return m1;
1684 }
1685
1686 // if one overrides or hides the other, use it
1687 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
1688 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
1689 // the two owners can never be the same if the target methods are compiled from source,
1690 // but we need to protect against cases where the methods are defined in some classfile
1691 // and make sure we issue an ambiguity error accordingly (by skipping the logic below).
1692 if (m1Owner != m2Owner) {
1693 if (types.asSuper(m1Owner.type, m2Owner) != null &&
1694 ((m1.owner.flags_field & INTERFACE) == 0 ||
1695 (m2.owner.flags_field & INTERFACE) != 0) &&
1696 m1.overrides(m2, m1Owner, types, false))
1697 return m1;
1698 if (types.asSuper(m2Owner.type, m1Owner) != null &&
1699 ((m2.owner.flags_field & INTERFACE) == 0 ||
1700 (m1.owner.flags_field & INTERFACE) != 0) &&
1701 m2.overrides(m1, m2Owner, types, false))
1702 return m2;
1703 }
1704 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
1705 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
1706 if (m1Abstract && !m2Abstract) return m2;
1707 if (m2Abstract && !m1Abstract) return m1;
1708 // both abstract or both concrete
1709 return ambiguityError(m1, m2);
1710 }
1711 if (m1SignatureMoreSpecific) return m1;
1712 if (m2SignatureMoreSpecific) return m2;
1713 return ambiguityError(m1, m2);
1714 case AMBIGUOUS:
1715 //compare m1 to ambiguous methods in m2
1716 AmbiguityError e = (AmbiguityError)m2.baseSymbol();
1717 boolean m1MoreSpecificThanAnyAmbiguous = true;
1718 boolean allAmbiguousMoreSpecificThanM1 = true;
1719 for (Symbol s : e.ambiguousSyms) {
1720 Symbol moreSpecific = mostSpecific(argtypes, m1, s, env, site, useVarargs);
1721 m1MoreSpecificThanAnyAmbiguous &= moreSpecific == m1;
1722 allAmbiguousMoreSpecificThanM1 &= moreSpecific == s;
1723 }
1724 if (m1MoreSpecificThanAnyAmbiguous)
1725 return m1;
1726 //if m1 is more specific than some ambiguous methods, but other ambiguous methods are
1727 //more specific than m1, add it as a new ambiguous method:
1728 if (!allAmbiguousMoreSpecificThanM1)
1729 e.addAmbiguousSymbol(m1);
1730 return e;
1731 default:
1732 throw new AssertionError();
1733 }
1734 }
1735 //where
1736 private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean useVarargs) {
1737 noteWarner.clear();
1738 int maxLength = Math.max(
1739 Math.max(m1.type.getParameterTypes().length(), actuals.length()),
1740 m2.type.getParameterTypes().length());
1741 MethodResolutionContext prevResolutionContext = currentResolutionContext;
1742 try {
1743 currentResolutionContext = new MethodResolutionContext();
1744 currentResolutionContext.step = prevResolutionContext.step;
1745 currentResolutionContext.methodCheck =
1746 prevResolutionContext.methodCheck.mostSpecificCheck(actuals);
1747 Type mst = instantiate(env, site, m2, null,
1748 adjustArgs(types.cvarLowerBounds(types.memberType(site, m1).getParameterTypes()), m1, maxLength, useVarargs), null,
1749 false, useVarargs, noteWarner);
1750 return mst != null &&
1751 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
1752 } finally {
1753 currentResolutionContext = prevResolutionContext;
1754 }
1755 }
1756
1757 List<Type> adjustArgs(List<Type> args, Symbol msym, int length, boolean allowVarargs) {
1758 if ((msym.flags() & VARARGS) != 0 && allowVarargs) {
1759 Type varargsElem = types.elemtype(args.last());
1760 if (varargsElem == null) {
1761 Assert.error("Bad varargs = " + args.last() + " " + msym);
1762 }
1763 List<Type> newArgs = args.reverse().tail.prepend(varargsElem).reverse();
1764 while (newArgs.length() < length) {
1765 newArgs = newArgs.append(newArgs.last());
1766 }
1767 return newArgs;
1768 } else {
1769 return args;
1770 }
1771 }
1772 //where
1773 Symbol ambiguityError(Symbol m1, Symbol m2) {
1774 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
1775 return (m1.flags() & CLASH) == 0 ? m1 : m2;
1776 } else {
1777 return new AmbiguityError(m1, m2);
1778 }
1779 }
1780
1781 Symbol findMethodInScope(Env<AttrContext> env,
1782 Type site,
1783 Name name,
1784 List<Type> argtypes,
1785 List<Type> typeargtypes,
1786 Scope sc,
1787 Symbol bestSoFar,
1788 boolean allowBoxing,
1789 boolean useVarargs,
1790 boolean abstractok) {
1791 for (Symbol s : sc.getSymbolsByName(name, new LookupFilter(abstractok))) {
1792 bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
1793 bestSoFar, allowBoxing, useVarargs);
1794 }
1795 return bestSoFar;
1796 }
1797 //where
1798 class LookupFilter implements Predicate<Symbol> {
1799
1800 boolean abstractOk;
1801
1802 LookupFilter(boolean abstractOk) {
1803 this.abstractOk = abstractOk;
1804 }
1805
1806 @Override
1807 public boolean test(Symbol s) {
1808 long flags = s.flags();
1809 return s.kind == MTH &&
1810 (flags & SYNTHETIC) == 0 &&
1811 (abstractOk ||
1812 (flags & DEFAULT) != 0 ||
1813 (flags & ABSTRACT) == 0);
1814 }
1815 }
1816
1817 /** Find best qualified method matching given name, type and value
1818 * arguments.
1819 * @param env The current environment.
1820 * @param site The original type from where the selection
1821 * takes place.
1822 * @param name The method's name.
1823 * @param argtypes The method's value arguments.
1824 * @param typeargtypes The method's type arguments
1825 * @param allowBoxing Allow boxing conversions of arguments.
1826 * @param useVarargs Box trailing arguments into an array for varargs.
1827 */
1828 Symbol findMethod(Env<AttrContext> env,
1829 Type site,
1830 Name name,
1831 List<Type> argtypes,
1832 List<Type> typeargtypes,
1833 boolean allowBoxing,
1834 boolean useVarargs) {
1835 Symbol bestSoFar = methodNotFound;
1836 bestSoFar = findMethod(env,
1837 site,
1838 name,
1839 argtypes,
1840 typeargtypes,
1841 site.tsym.type,
1842 bestSoFar,
1843 allowBoxing,
1844 useVarargs);
1845 return bestSoFar;
1846 }
1847 // where
1848 private Symbol findMethod(Env<AttrContext> env,
1849 Type site,
1850 Name name,
1851 List<Type> argtypes,
1852 List<Type> typeargtypes,
1853 Type intype,
1854 Symbol bestSoFar,
1855 boolean allowBoxing,
1856 boolean useVarargs) {
1857 @SuppressWarnings({"unchecked","rawtypes"})
1858 List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
1859
1860 InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
1861 boolean isInterface = site.tsym.isInterface();
1862 for (TypeSymbol s : isInterface ? List.of(intype.tsym) : superclasses(intype)) {
1863 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1864 s.members(), bestSoFar, allowBoxing, useVarargs, true);
1865 if (name == names.init) return bestSoFar;
1866 iphase = (iphase == null) ? null : iphase.update(s, this);
1867 if (iphase != null) {
1868 for (Type itype : types.interfaces(s.type)) {
1869 itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
1870 }
1871 }
1872 }
1873
1874 Symbol concrete = bestSoFar.kind.isValid() &&
1875 (bestSoFar.flags() & ABSTRACT) == 0 ?
1876 bestSoFar : methodNotFound;
1877
1878 for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
1879 //keep searching for abstract methods
1880 for (Type itype : itypes[iphase2.ordinal()]) {
1881 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
1882 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
1883 (itype.tsym.flags() & DEFAULT) == 0) continue;
1884 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1885 itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, true);
1886 if (concrete != bestSoFar &&
1887 concrete.kind.isValid() &&
1888 bestSoFar.kind.isValid() &&
1889 types.isSubSignature(concrete.type, bestSoFar.type)) {
1890 //this is an hack - as javac does not do full membership checks
1891 //most specific ends up comparing abstract methods that might have
1892 //been implemented by some concrete method in a subclass and,
1893 //because of raw override, it is possible for an abstract method
1894 //to be more specific than the concrete method - so we need
1895 //to explicitly call that out (see CR 6178365)
1896 bestSoFar = concrete;
1897 }
1898 }
1899 }
1900 if (isInterface && bestSoFar.kind.isResolutionError()) {
1901 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1902 syms.objectType.tsym.members(), bestSoFar, allowBoxing, useVarargs, true);
1903 if (bestSoFar.kind.isValid()) {
1904 Symbol baseSymbol = bestSoFar;
1905 bestSoFar = new MethodSymbol(bestSoFar.flags_field, bestSoFar.name, bestSoFar.type, intype.tsym) {
1906 @Override
1907 public Symbol baseSymbol() {
1908 return baseSymbol;
1909 }
1910 };
1911 }
1912 }
1913 return bestSoFar;
1914 }
1915
1916 enum InterfaceLookupPhase {
1917 ABSTRACT_OK() {
1918 @Override
1919 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1920 //We should not look for abstract methods if receiver is a concrete class
1921 //(as concrete classes are expected to implement all abstracts coming
1922 //from superinterfaces)
1923 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
1924 return this;
1925 } else {
1926 return DEFAULT_OK;
1927 }
1928 }
1929 },
1930 DEFAULT_OK() {
1931 @Override
1932 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1933 return this;
1934 }
1935 };
1936
1937 abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
1938 }
1939
1940 /**
1941 * Return an Iterable object to scan the superclasses of a given type.
1942 * It's crucial that the scan is done lazily, as we don't want to accidentally
1943 * access more supertypes than strictly needed (as this could trigger completion
1944 * errors if some of the not-needed supertypes are missing/ill-formed).
1945 */
1946 Iterable<TypeSymbol> superclasses(final Type intype) {
1947 return () -> new Iterator<TypeSymbol>() {
1948
1949 List<TypeSymbol> seen = List.nil();
1950 TypeSymbol currentSym = symbolFor(intype);
1951 TypeSymbol prevSym = null;
1952
1953 public boolean hasNext() {
1954 if (currentSym == syms.noSymbol) {
1955 currentSym = symbolFor(types.supertype(prevSym.type));
1956 }
1957 return currentSym != null;
1958 }
1959
1960 public TypeSymbol next() {
1961 prevSym = currentSym;
1962 currentSym = syms.noSymbol;
1963 Assert.check(prevSym != null || prevSym != syms.noSymbol);
1964 return prevSym;
1965 }
1966
1967 public void remove() {
1968 throw new UnsupportedOperationException();
1969 }
1970
1971 TypeSymbol symbolFor(Type t) {
1972 if (!t.hasTag(CLASS) &&
1973 !t.hasTag(TYPEVAR)) {
1974 return null;
1975 }
1976 t = types.skipTypeVars(t, false);
1977 if (seen.contains(t.tsym)) {
1978 //degenerate case in which we have a circular
1979 //class hierarchy - because of ill-formed classfiles
1980 return null;
1981 }
1982 seen = seen.prepend(t.tsym);
1983 return t.tsym;
1984 }
1985 };
1986 }
1987
1988 /** Find unqualified method matching given name, type and value arguments.
1989 * @param env The current environment.
1990 * @param name The method's name.
1991 * @param argtypes The method's value arguments.
1992 * @param typeargtypes The method's type arguments.
1993 * @param allowBoxing Allow boxing conversions of arguments.
1994 * @param useVarargs Box trailing arguments into an array for varargs.
1995 */
1996 Symbol findFun(Env<AttrContext> env, Name name,
1997 List<Type> argtypes, List<Type> typeargtypes,
1998 boolean allowBoxing, boolean useVarargs) {
1999 Symbol bestSoFar = methodNotFound;
2000 Env<AttrContext> env1 = env;
2001 boolean staticOnly = false;
2002 while (env1.outer != null) {
2003 if (isStatic(env1)) staticOnly = true;
2004 Assert.check(env1.info.preferredTreeForDiagnostics == null);
2005 env1.info.preferredTreeForDiagnostics = env.tree;
2006 try {
2007 Symbol sym = findMethod(
2008 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
2009 allowBoxing, useVarargs);
2010 if (sym.exists()) {
2011 if (sym.kind == MTH &&
2012 sym.owner.kind == TYP &&
2013 (sym.flags() & STATIC) == 0) {
2014 if (staticOnly)
2015 return new StaticError(sym);
2016 if (env1.info.ctorPrologue && env1 == env)
2017 return new RefBeforeCtorCalledError(sym);
2018 }
2019 return sym;
2020 } else {
2021 bestSoFar = bestOf(bestSoFar, sym);
2022 }
2023 } finally {
2024 env1.info.preferredTreeForDiagnostics = null;
2025 }
2026 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
2027 env1 = env1.outer;
2028 }
2029
2030 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
2031 typeargtypes, allowBoxing, useVarargs);
2032 if (sym.exists())
2033 return sym;
2034
2035 for (Symbol currentSym : env.toplevel.namedImportScope.getSymbolsByName(name)) {
2036 Symbol origin = env.toplevel.namedImportScope.getOrigin(currentSym).owner;
2037 if (currentSym.kind == MTH) {
2038 if (currentSym.owner.type != origin.type)
2039 currentSym = currentSym.clone(origin);
2040 if (!isAccessible(env, origin.type, currentSym))
2041 currentSym = new AccessError(env, origin.type, currentSym);
2042 bestSoFar = selectBest(env, origin.type,
2043 argtypes, typeargtypes,
2044 currentSym, bestSoFar,
2045 allowBoxing, useVarargs);
2046 }
2047 }
2048 if (bestSoFar.exists())
2049 return bestSoFar;
2050
2051 for (Symbol currentSym : env.toplevel.starImportScope.getSymbolsByName(name)) {
2052 Symbol origin = env.toplevel.starImportScope.getOrigin(currentSym).owner;
2053 if (currentSym.kind == MTH) {
2054 if (currentSym.owner.type != origin.type)
2055 currentSym = currentSym.clone(origin);
2056 if (!isAccessible(env, origin.type, currentSym))
2057 currentSym = new AccessError(env, origin.type, currentSym);
2058 bestSoFar = selectBest(env, origin.type,
2059 argtypes, typeargtypes,
2060 currentSym, bestSoFar,
2061 allowBoxing, useVarargs);
2062 }
2063 }
2064 return bestSoFar;
2065 }
2066
2067 /** Load toplevel or member class with given fully qualified name and
2068 * verify that it is accessible.
2069 * @param env The current environment.
2070 * @param name The fully qualified name of the class to be loaded.
2071 */
2072 Symbol loadClass(Env<AttrContext> env, Name name, RecoveryLoadClass recoveryLoadClass) {
2073 try {
2074 ClassSymbol c = finder.loadClass(env.toplevel.modle, name);
2075 return isAccessible(env, c) ? c : new AccessError(env, null, c);
2076 } catch (ClassFinder.BadClassFile err) {
2077 return new BadClassFileError(err);
2078 } catch (CompletionFailure ex) {
2079 Symbol candidate = recoveryLoadClass.loadClass(env, name);
2080
2081 if (candidate != null) {
2082 return candidate;
2083 }
2084
2085 return typeNotFound;
2086 }
2087 }
2088
2089 public interface RecoveryLoadClass {
2090 Symbol loadClass(Env<AttrContext> env, Name name);
2091 }
2092
2093 private final RecoveryLoadClass noRecovery = (env, name) -> null;
2094
2095 private final RecoveryLoadClass doRecoveryLoadClass = new RecoveryLoadClass() {
2096 @Override public Symbol loadClass(Env<AttrContext> env, Name name) {
2097 List<Name> candidates = Convert.classCandidates(name);
2098 return lookupInvisibleSymbol(env, name,
2099 n -> () -> createCompoundIterator(candidates,
2100 c -> syms.getClassesForName(c)
2101 .iterator()),
2102 (ms, n) -> {
2103 for (Name candidate : candidates) {
2104 try {
2105 return finder.loadClass(ms, candidate);
2106 } catch (CompletionFailure cf) {
2107 //ignore
2108 }
2109 }
2110 return null;
2111 }, sym -> sym.kind == Kind.TYP, typeNotFound);
2112 }
2113 };
2114
2115 private final RecoveryLoadClass namedImportScopeRecovery = (env, name) -> {
2116 Scope importScope = env.toplevel.namedImportScope;
2117 Symbol existing = importScope.findFirst(Convert.shortName(name),
2118 sym -> sym.kind == TYP && sym.flatName() == name);
2119
2120 if (existing != null) {
2121 return new InvisibleSymbolError(env, true, existing);
2122 }
2123 return null;
2124 };
2125
2126 private final RecoveryLoadClass starImportScopeRecovery = (env, name) -> {
2127 Scope importScope = env.toplevel.starImportScope;
2128 Symbol existing = importScope.findFirst(Convert.shortName(name),
2129 sym -> sym.kind == TYP && sym.flatName() == name);
2130
2131 if (existing != null) {
2132 try {
2133 existing = finder.loadClass(existing.packge().modle, name);
2134
2135 return new InvisibleSymbolError(env, true, existing);
2136 } catch (CompletionFailure cf) {
2137 //ignore
2138 }
2139 }
2140
2141 return null;
2142 };
2143
2144 Symbol lookupPackage(Env<AttrContext> env, Name name) {
2145 PackageSymbol pack = syms.lookupPackage(env.toplevel.modle, name);
2146
2147 if (allowModules && isImportOnDemand(env, name)) {
2148 if (pack.members().isEmpty()) {
2149 return lookupInvisibleSymbol(env, name, syms::getPackagesForName, syms::enterPackage, sym -> {
2150 sym.complete();
2151 return !sym.members().isEmpty();
2152 }, pack);
2153 }
2154 }
2155
2156 return pack;
2157 }
2158
2159 private boolean isImportOnDemand(Env<AttrContext> env, Name name) {
2160 if (!env.tree.hasTag(IMPORT))
2161 return false;
2162
2163 JCTree qualid = ((JCImport) env.tree).qualid;
2164
2165 if (!qualid.hasTag(SELECT))
2166 return false;
2167
2168 if (TreeInfo.name(qualid) != names.asterisk)
2169 return false;
2170
2171 return TreeInfo.fullName(((JCFieldAccess) qualid).selected) == name;
2172 }
2173
2174 private <S extends Symbol> Symbol lookupInvisibleSymbol(Env<AttrContext> env,
2175 Name name,
2176 Function<Name, Iterable<S>> get,
2177 BiFunction<ModuleSymbol, Name, S> load,
2178 Predicate<S> validate,
2179 Symbol defaultResult) {
2180 //even if a class/package cannot be found in the current module and among packages in modules
2181 //it depends on that are exported for any or this module, the class/package may exist internally
2182 //in some of these modules, or may exist in a module on which this module does not depend.
2183 //Provide better diagnostic in such cases by looking for the class in any module:
2184 Iterable<? extends S> candidates = get.apply(name);
2185
2186 for (S sym : candidates) {
2187 if (validate.test(sym))
2188 return createInvisibleSymbolError(env, sym);
2189 }
2190
2191 Set<ModuleSymbol> recoverableModules = new HashSet<>(syms.getAllModules());
2192
2193 recoverableModules.add(syms.unnamedModule);
2194 recoverableModules.remove(env.toplevel.modle);
2195
2196 for (ModuleSymbol ms : recoverableModules) {
2197 //avoid overly eager completing classes from source-based modules, as those
2198 //may not be completable with the current compiler settings:
2199 if (ms.sourceLocation == null) {
2200 if (ms.classLocation == null) {
2201 ms = moduleFinder.findModule(ms);
2202 }
2203
2204 if (ms.kind != ERR) {
2205 S sym = load.apply(ms, name);
2206
2207 if (sym != null && validate.test(sym)) {
2208 return createInvisibleSymbolError(env, sym);
2209 }
2210 }
2211 }
2212 }
2213
2214 return defaultResult;
2215 }
2216
2217 private Symbol createInvisibleSymbolError(Env<AttrContext> env, Symbol sym) {
2218 if (symbolPackageVisible(env, sym)) {
2219 return new AccessError(env, null, sym);
2220 } else {
2221 return new InvisibleSymbolError(env, false, sym);
2222 }
2223 }
2224
2225 private boolean symbolPackageVisible(Env<AttrContext> env, Symbol sym) {
2226 ModuleSymbol envMod = env.toplevel.modle;
2227 PackageSymbol symPack = sym.packge();
2228 return envMod == symPack.modle ||
2229 envMod.visiblePackages.containsKey(symPack.fullname);
2230 }
2231
2232 /**
2233 * Find a type declared in a scope (not inherited). Return null
2234 * if none is found.
2235 * @param env The current environment.
2236 * @param site The original type from where the selection takes
2237 * place.
2238 * @param name The type's name.
2239 * @param c The class to search for the member type. This is
2240 * always a superclass or implemented interface of
2241 * site's class.
2242 */
2243 Symbol findImmediateMemberType(Env<AttrContext> env,
2244 Type site,
2245 Name name,
2246 TypeSymbol c) {
2247 for (Symbol sym : c.members().getSymbolsByName(name)) {
2248 if (sym.kind == TYP) {
2249 return isAccessible(env, site, sym)
2250 ? sym
2251 : new AccessError(env, site, sym);
2252 }
2253 }
2254 return typeNotFound;
2255 }
2256
2257 /** Find a member type inherited from a superclass or interface.
2258 * @param env The current environment.
2259 * @param site The original type from where the selection takes
2260 * place.
2261 * @param name The type's name.
2262 * @param c The class to search for the member type. This is
2263 * always a superclass or implemented interface of
2264 * site's class.
2265 */
2266 Symbol findInheritedMemberType(Env<AttrContext> env,
2267 Type site,
2268 Name name,
2269 TypeSymbol c) {
2270 Symbol bestSoFar = typeNotFound;
2271 Symbol sym;
2272 Type st = types.supertype(c.type);
2273 if (st != null && st.hasTag(CLASS)) {
2274 sym = findMemberType(env, site, name, st.tsym);
2275 bestSoFar = bestOf(bestSoFar, sym);
2276 }
2277 for (List<Type> l = types.interfaces(c.type);
2278 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
2279 l = l.tail) {
2280 sym = findMemberType(env, site, name, l.head.tsym);
2281 if (!bestSoFar.kind.isResolutionError() &&
2282 !sym.kind.isResolutionError() &&
2283 sym.owner != bestSoFar.owner)
2284 bestSoFar = new AmbiguityError(bestSoFar, sym);
2285 else
2286 bestSoFar = bestOf(bestSoFar, sym);
2287 }
2288 return bestSoFar;
2289 }
2290
2291 /** Find qualified member type.
2292 * @param env The current environment.
2293 * @param site The original type from where the selection takes
2294 * place.
2295 * @param name The type's name.
2296 * @param c The class to search for the member type. This is
2297 * always a superclass or implemented interface of
2298 * site's class.
2299 */
2300 Symbol findMemberType(Env<AttrContext> env,
2301 Type site,
2302 Name name,
2303 TypeSymbol c) {
2304 Symbol sym = findImmediateMemberType(env, site, name, c);
2305
2306 if (sym != typeNotFound)
2307 return sym;
2308
2309 return findInheritedMemberType(env, site, name, c);
2310
2311 }
2312
2313 /** Find a global type in given scope and load corresponding class.
2314 * @param env The current environment.
2315 * @param scope The scope in which to look for the type.
2316 * @param name The type's name.
2317 */
2318 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name, RecoveryLoadClass recoveryLoadClass) {
2319 Symbol bestSoFar = typeNotFound;
2320 for (Symbol s : scope.getSymbolsByName(name)) {
2321 Symbol sym = loadClass(env, s.flatName(), recoveryLoadClass);
2322 if (bestSoFar.kind == TYP && sym.kind == TYP &&
2323 bestSoFar != sym)
2324 return new AmbiguityError(bestSoFar, sym);
2325 else
2326 bestSoFar = bestOf(bestSoFar, sym);
2327 }
2328 return bestSoFar;
2329 }
2330
2331 Symbol findTypeVar(Env<AttrContext> env, Name name, boolean staticOnly) {
2332 for (Symbol sym : env.info.scope.getSymbolsByName(name)) {
2333 if (sym.kind == TYP) {
2334 if (sym.type.hasTag(TYPEVAR) &&
2335 (staticOnly || (isStatic(env) && sym.owner.kind == TYP)))
2336 // if staticOnly is set, it means that we have recursed through a static declaration,
2337 // so type variable symbols should not be accessible. If staticOnly is unset, but
2338 // we are in a static declaration (field or method), we should not allow type-variables
2339 // defined in the enclosing class to "leak" into this context.
2340 return new StaticError(sym);
2341 return sym;
2342 }
2343 }
2344 return typeNotFound;
2345 }
2346
2347 /** Find an unqualified type symbol.
2348 * @param env The current environment.
2349 * @param name The type's name.
2350 */
2351 Symbol findType(Env<AttrContext> env, Name name) {
2352 if (name == names.empty)
2353 return typeNotFound; // do not allow inadvertent "lookup" of anonymous types
2354 Symbol bestSoFar = typeNotFound;
2355 Symbol sym;
2356 boolean staticOnly = false;
2357 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
2358 // First, look for a type variable and the first member type
2359 final Symbol tyvar = findTypeVar(env1, name, staticOnly);
2360 if (isStatic(env1)) staticOnly = true;
2361 sym = findImmediateMemberType(env1, env1.enclClass.sym.type,
2362 name, env1.enclClass.sym);
2363
2364 // Return the type variable if we have it, and have no
2365 // immediate member, OR the type variable is for a method.
2366 if (tyvar != typeNotFound) {
2367 if (env.baseClause || sym == typeNotFound ||
2368 (tyvar.kind == TYP && tyvar.exists() &&
2369 tyvar.owner.kind == MTH)) {
2370 return tyvar;
2371 }
2372 }
2373
2374 // If the environment is a class def, finish up,
2375 // otherwise, do the entire findMemberType
2376 if (sym == typeNotFound)
2377 sym = findInheritedMemberType(env1, env1.enclClass.sym.type,
2378 name, env1.enclClass.sym);
2379
2380 if (staticOnly && sym.kind == TYP &&
2381 sym.type.hasTag(CLASS) &&
2382 sym.type.getEnclosingType().hasTag(CLASS) &&
2383 env1.enclClass.sym.type.isParameterized() &&
2384 sym.type.getEnclosingType().isParameterized())
2385 return new StaticError(sym);
2386 else if (sym.exists()) return sym;
2387 else bestSoFar = bestOf(bestSoFar, sym);
2388
2389 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
2390 if ((encl.sym.flags() & STATIC) != 0)
2391 staticOnly = true;
2392 }
2393
2394 if (!env.tree.hasTag(IMPORT)) {
2395 sym = findGlobalType(env, env.toplevel.namedImportScope, name, namedImportScopeRecovery);
2396 if (sym.exists()) return sym;
2397 else bestSoFar = bestOf(bestSoFar, sym);
2398
2399 sym = findGlobalType(env, env.toplevel.toplevelScope, name, noRecovery);
2400 if (sym.exists()) return sym;
2401 else bestSoFar = bestOf(bestSoFar, sym);
2402
2403 sym = findGlobalType(env, env.toplevel.packge.members(), name, noRecovery);
2404 if (sym.exists()) return sym;
2405 else bestSoFar = bestOf(bestSoFar, sym);
2406
2407 sym = findGlobalType(env, env.toplevel.starImportScope, name, starImportScopeRecovery);
2408 if (sym.exists()) return sym;
2409 else bestSoFar = bestOf(bestSoFar, sym);
2410 }
2411
2412 return bestSoFar;
2413 }
2414
2415 /** Find an unqualified identifier which matches a specified kind set.
2416 * @param pos position on which report warnings, if any;
2417 * null warnings should not be reported
2418 * @param env The current environment.
2419 * @param name The identifier's name.
2420 * @param kind Indicates the possible symbol kinds
2421 * (a subset of VAL, TYP, PCK).
2422 */
2423 Symbol findIdent(DiagnosticPosition pos, Env<AttrContext> env, Name name, KindSelector kind) {
2424 return checkNonExistentType(checkRestrictedType(pos, findIdentInternal(env, name, kind), name));
2425 }
2426
2427 Symbol findIdentInternal(Env<AttrContext> env, Name name, KindSelector kind) {
2428 Symbol bestSoFar = typeNotFound;
2429 Symbol sym;
2430
2431 if (kind.contains(KindSelector.VAL)) {
2432 sym = findVar(env, name);
2433 if (sym.exists()) return sym;
2434 else bestSoFar = bestOf(bestSoFar, sym);
2435 }
2436
2437 if (kind.contains(KindSelector.TYP)) {
2438 sym = findType(env, name);
2439 if (sym.exists()) return sym;
2440 else bestSoFar = bestOf(bestSoFar, sym);
2441 }
2442
2443 if (kind.contains(KindSelector.PCK))
2444 return lookupPackage(env, name);
2445 else return bestSoFar;
2446 }
2447
2448 /** Find an identifier in a package which matches a specified kind set.
2449 * @param pos position on which report warnings, if any;
2450 * null warnings should not be reported
2451 * @param env The current environment.
2452 * @param name The identifier's name.
2453 * @param kind Indicates the possible symbol kinds
2454 * (a nonempty subset of TYP, PCK).
2455 */
2456 Symbol findIdentInPackage(DiagnosticPosition pos,
2457 Env<AttrContext> env, TypeSymbol pck,
2458 Name name, KindSelector kind) {
2459 return checkNonExistentType(checkRestrictedType(pos, findIdentInPackageInternal(env, pck, name, kind), name));
2460 }
2461
2462 Symbol findIdentInPackageInternal(Env<AttrContext> env, TypeSymbol pck,
2463 Name name, KindSelector kind) {
2464 Name fullname = TypeSymbol.formFullName(name, pck);
2465 Symbol bestSoFar = typeNotFound;
2466 if (kind.contains(KindSelector.TYP)) {
2467 RecoveryLoadClass recoveryLoadClass =
2468 allowModules && !kind.contains(KindSelector.PCK) &&
2469 !pck.exists() && !env.info.attributionMode.isSpeculative ?
2470 doRecoveryLoadClass : noRecovery;
2471 Symbol sym = loadClass(env, fullname, recoveryLoadClass);
2472 if (sym.exists()) {
2473 // don't allow programs to use flatnames
2474 if (name == sym.name) return sym;
2475 }
2476 else bestSoFar = bestOf(bestSoFar, sym);
2477 }
2478 if (kind.contains(KindSelector.PCK)) {
2479 return lookupPackage(env, fullname);
2480 }
2481 return bestSoFar;
2482 }
2483
2484 /** Find an identifier among the members of a given type `site'.
2485 * @param pos position on which report warnings, if any;
2486 * null warnings should not be reported
2487 * @param env The current environment.
2488 * @param site The type containing the symbol to be found.
2489 * @param name The identifier's name.
2490 * @param kind Indicates the possible symbol kinds
2491 * (a subset of VAL, TYP).
2492 */
2493 Symbol findIdentInType(DiagnosticPosition pos,
2494 Env<AttrContext> env, Type site,
2495 Name name, KindSelector kind) {
2496 return checkNonExistentType(checkRestrictedType(pos, findIdentInTypeInternal(env, site, name, kind), name));
2497 }
2498
2499 private Symbol checkNonExistentType(Symbol symbol) {
2500 /* Guard against returning a type is not on the class path of the current compilation,
2501 * but *was* on the class path of a separate compilation that produced a class file
2502 * that is on the class path of the current compilation. Such a type will fail completion
2503 * but the completion failure may have been silently swallowed (e.g. missing annotation types)
2504 * with an error stub symbol lingering in the symbol tables.
2505 */
2506 return symbol instanceof ClassSymbol c && c.type.isErroneous() && c.classfile == null ? typeNotFound : symbol;
2507 }
2508
2509 Symbol findIdentInTypeInternal(Env<AttrContext> env, Type site,
2510 Name name, KindSelector kind) {
2511 Symbol bestSoFar = typeNotFound;
2512 Symbol sym;
2513 if (kind.contains(KindSelector.VAL)) {
2514 sym = findField(env, site, name, site.tsym);
2515 if (sym.exists()) return sym;
2516 else bestSoFar = bestOf(bestSoFar, sym);
2517 }
2518
2519 if (kind.contains(KindSelector.TYP)) {
2520 sym = findMemberType(env, site, name, site.tsym);
2521 if (sym.exists()) return sym;
2522 else bestSoFar = bestOf(bestSoFar, sym);
2523 }
2524 return bestSoFar;
2525 }
2526
2527 private Symbol checkRestrictedType(DiagnosticPosition pos, Symbol bestSoFar, Name name) {
2528 if (bestSoFar.kind == TYP || bestSoFar.kind == ABSENT_TYP) {
2529 if (allowLocalVariableTypeInference && name.equals(names.var)) {
2530 bestSoFar = new BadRestrictedTypeError(names.var);
2531 } else if (name.equals(names.yield)) {
2532 if (allowYieldStatement) {
2533 bestSoFar = new BadRestrictedTypeError(names.yield);
2534 } else if (pos != null) {
2535 log.warning(pos, Warnings.IllegalRefToRestrictedType(names.yield));
2536 }
2537 }
2538 }
2539 return bestSoFar;
2540 }
2541
2542 /* ***************************************************************************
2543 * Access checking
2544 * The following methods convert ResolveErrors to ErrorSymbols, issuing
2545 * an error message in the process
2546 ****************************************************************************/
2547
2548 /** If `sym' is a bad symbol: report error and return errSymbol
2549 * else pass through unchanged,
2550 * additional arguments duplicate what has been used in trying to find the
2551 * symbol {@literal (--> flyweight pattern)}. This improves performance since we
2552 * expect misses to happen frequently.
2553 *
2554 * @param sym The symbol that was found, or a ResolveError.
2555 * @param pos The position to use for error reporting.
2556 * @param location The symbol the served as a context for this lookup
2557 * @param site The original type from where the selection took place.
2558 * @param name The symbol's name.
2559 * @param qualified Did we get here through a qualified expression resolution?
2560 * @param argtypes The invocation's value arguments,
2561 * if we looked for a method.
2562 * @param typeargtypes The invocation's type arguments,
2563 * if we looked for a method.
2564 * @param logResolveHelper helper class used to log resolve errors
2565 */
2566 Symbol accessInternal(Symbol sym,
2567 DiagnosticPosition pos,
2568 Symbol location,
2569 Type site,
2570 Name name,
2571 boolean qualified,
2572 List<Type> argtypes,
2573 List<Type> typeargtypes,
2574 LogResolveHelper logResolveHelper) {
2575 if (sym.kind.isResolutionError()) {
2576 ResolveError errSym = (ResolveError)sym.baseSymbol();
2577 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
2578 argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
2579 if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
2580 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
2581 }
2582 }
2583 return sym;
2584 }
2585
2586 /**
2587 * Variant of the generalized access routine, to be used for generating method
2588 * resolution diagnostics
2589 */
2590 Symbol accessMethod(Symbol sym,
2591 DiagnosticPosition pos,
2592 Symbol location,
2593 Type site,
2594 Name name,
2595 boolean qualified,
2596 List<Type> argtypes,
2597 List<Type> typeargtypes) {
2598 return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
2599 }
2600
2601 /** Same as original accessMethod(), but without location.
2602 */
2603 Symbol accessMethod(Symbol sym,
2604 DiagnosticPosition pos,
2605 Type site,
2606 Name name,
2607 boolean qualified,
2608 List<Type> argtypes,
2609 List<Type> typeargtypes) {
2610 return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
2611 }
2612
2613 /**
2614 * Variant of the generalized access routine, to be used for generating variable,
2615 * type resolution diagnostics
2616 */
2617 Symbol accessBase(Symbol sym,
2618 DiagnosticPosition pos,
2619 Symbol location,
2620 Type site,
2621 Name name,
2622 boolean qualified) {
2623 return accessInternal(sym, pos, location, site, name, qualified, List.nil(), null, basicLogResolveHelper);
2624 }
2625
2626 /** Same as original accessBase(), but without location.
2627 */
2628 Symbol accessBase(Symbol sym,
2629 DiagnosticPosition pos,
2630 Type site,
2631 Name name,
2632 boolean qualified) {
2633 return accessBase(sym, pos, site.tsym, site, name, qualified);
2634 }
2635
2636 interface LogResolveHelper {
2637 boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
2638 List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
2639 }
2640
2641 LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
2642 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2643 return !site.isErroneous();
2644 }
2645 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2646 return argtypes;
2647 }
2648 };
2649
2650 LogResolveHelper silentLogResolveHelper = new LogResolveHelper() {
2651 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2652 return false;
2653 }
2654 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2655 return argtypes;
2656 }
2657 };
2658
2659 LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
2660 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
2661 return !site.isErroneous() &&
2662 !Type.isErroneous(argtypes) &&
2663 (typeargtypes == null || !Type.isErroneous(typeargtypes));
2664 }
2665 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
2666 return argtypes.map(new ResolveDeferredRecoveryMap(AttrMode.SPECULATIVE, accessedSym, currentResolutionContext.step));
2667 }
2668 };
2669
2670 class ResolveDeferredRecoveryMap extends DeferredAttr.RecoveryDeferredTypeMap {
2671
2672 public ResolveDeferredRecoveryMap(AttrMode mode, Symbol msym, MethodResolutionPhase step) {
2673 deferredAttr.super(mode, msym, step);
2674 }
2675
2676 @Override
2677 protected Type typeOf(DeferredType dt, Type pt) {
2678 Type res = super.typeOf(dt, pt);
2679 if (!res.isErroneous()) {
2680 switch (TreeInfo.skipParens(dt.tree).getTag()) {
2681 case LAMBDA:
2682 case REFERENCE:
2683 return dt;
2684 case CONDEXPR:
2685 return res == Type.recoveryType ?
2686 dt : res;
2687 }
2688 }
2689 return res;
2690 }
2691 }
2692
2693 /** Check that sym is not an abstract method.
2694 */
2695 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
2696 if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
2697 log.error(pos,
2698 Errors.AbstractCantBeAccessedDirectly(kindName(sym),sym, sym.location()));
2699 }
2700
2701 /* ***************************************************************************
2702 * Name resolution
2703 * Naming conventions are as for symbol lookup
2704 * Unlike the find... methods these methods will report access errors
2705 ****************************************************************************/
2706
2707 /** Resolve an unqualified (non-method) identifier.
2708 * @param pos The position to use for error reporting.
2709 * @param env The environment current at the identifier use.
2710 * @param name The identifier's name.
2711 * @param kind The set of admissible symbol kinds for the identifier.
2712 */
2713 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
2714 Name name, KindSelector kind) {
2715 return accessBase(
2716 findIdent(pos, env, name, kind),
2717 pos, env.enclClass.sym.type, name, false);
2718 }
2719
2720 /** Resolve an unqualified method identifier.
2721 * @param pos The position to use for error reporting.
2722 * @param env The environment current at the method invocation.
2723 * @param name The identifier's name.
2724 * @param argtypes The types of the invocation's value arguments.
2725 * @param typeargtypes The types of the invocation's type arguments.
2726 */
2727 Symbol resolveMethod(DiagnosticPosition pos,
2728 Env<AttrContext> env,
2729 Name name,
2730 List<Type> argtypes,
2731 List<Type> typeargtypes) {
2732 return lookupMethod(env, pos, env.enclClass.sym, resolveMethodCheck,
2733 new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
2734 @Override
2735 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2736 return findFun(env, name, argtypes, typeargtypes,
2737 phase.isBoxingRequired(),
2738 phase.isVarargsRequired());
2739 }});
2740 }
2741
2742 /** Resolve a qualified method identifier
2743 * @param pos The position to use for error reporting.
2744 * @param env The environment current at the method invocation.
2745 * @param site The type of the qualifying expression, in which
2746 * identifier is searched.
2747 * @param name The identifier's name.
2748 * @param argtypes The types of the invocation's value arguments.
2749 * @param typeargtypes The types of the invocation's type arguments.
2750 */
2751 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2752 Type site, Name name, List<Type> argtypes,
2753 List<Type> typeargtypes) {
2754 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
2755 }
2756 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2757 Symbol location, Type site, Name name, List<Type> argtypes,
2758 List<Type> typeargtypes) {
2759 return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
2760 }
2761 private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
2762 DiagnosticPosition pos, Env<AttrContext> env,
2763 Symbol location, Type site, Name name, List<Type> argtypes,
2764 List<Type> typeargtypes) {
2765 return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
2766 @Override
2767 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2768 return findMethod(env, site, name, argtypes, typeargtypes,
2769 phase.isBoxingRequired(),
2770 phase.isVarargsRequired());
2771 }
2772 @Override
2773 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2774 if (sym.kind.isResolutionError()) {
2775 sym = super.access(env, pos, location, sym);
2776 } else {
2777 MethodSymbol msym = (MethodSymbol)sym;
2778 if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
2779 env.info.pendingResolutionPhase = BASIC;
2780 return findPolymorphicSignatureInstance(env, sym, argtypes);
2781 }
2782 }
2783 return sym;
2784 }
2785 });
2786 }
2787
2788 /** Find or create an implicit method of exactly the given type (after erasure).
2789 * Searches in a side table, not the main scope of the site.
2790 * This emulates the lookup process required by JSR 292 in JVM.
2791 * @param env Attribution environment
2792 * @param spMethod signature polymorphic method - i.e. MH.invokeExact
2793 * @param argtypes The required argument types
2794 */
2795 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
2796 final Symbol spMethod,
2797 List<Type> argtypes) {
2798 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
2799 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
2800 return findPolymorphicSignatureInstance(spMethod, mtype);
2801 }
2802
2803 Symbol findPolymorphicSignatureInstance(final Symbol spMethod,
2804 Type mtype) {
2805 for (Symbol sym : polymorphicSignatureScope.getSymbolsByName(spMethod.name)) {
2806 // Check that there is already a method symbol for the method
2807 // type and owner
2808 if (types.isSameType(mtype, sym.type) &&
2809 spMethod.owner == sym.owner) {
2810 return sym;
2811 }
2812 }
2813
2814 Type spReturnType = spMethod.asType().getReturnType();
2815 if (types.isSameType(spReturnType, syms.objectType)) {
2816 // Polymorphic return, pass through mtype
2817 } else if (!types.isSameType(spReturnType, mtype.getReturnType())) {
2818 // Retain the sig poly method's return type, which differs from that of mtype
2819 // Will result in an incompatible return type error
2820 mtype = new MethodType(mtype.getParameterTypes(),
2821 spReturnType,
2822 mtype.getThrownTypes(),
2823 syms.methodClass);
2824 }
2825
2826 // Create the desired method
2827 // Retain static modifier is to support invocations to
2828 // MethodHandle.linkTo* methods
2829 long flags = ABSTRACT | HYPOTHETICAL |
2830 spMethod.flags() & (Flags.AccessFlags | Flags.STATIC);
2831 Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner) {
2832 @Override
2833 public Symbol baseSymbol() {
2834 return spMethod;
2835 }
2836 };
2837 if (!mtype.isErroneous()) { // Cache only if kosher.
2838 polymorphicSignatureScope.enter(msym);
2839 }
2840 return msym;
2841 }
2842
2843 /** Resolve a qualified method identifier, throw a fatal error if not
2844 * found.
2845 * @param pos The position to use for error reporting.
2846 * @param env The environment current at the method invocation.
2847 * @param site The type of the qualifying expression, in which
2848 * identifier is searched.
2849 * @param name The identifier's name.
2850 * @param argtypes The types of the invocation's value arguments.
2851 * @param typeargtypes The types of the invocation's type arguments.
2852 */
2853 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
2854 Type site, Name name,
2855 List<Type> argtypes,
2856 List<Type> typeargtypes) {
2857 MethodResolutionContext resolveContext = new MethodResolutionContext();
2858 resolveContext.internalResolution = true;
2859 Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
2860 site, name, argtypes, typeargtypes);
2861 if (sym.kind == MTH) return (MethodSymbol)sym;
2862 else throw new FatalError(
2863 diags.fragment(Fragments.FatalErrCantLocateMeth(name)));
2864 }
2865
2866 /** Resolve constructor.
2867 * @param pos The position to use for error reporting.
2868 * @param env The environment current at the constructor invocation.
2869 * @param site The type of class for which a constructor is searched.
2870 * @param argtypes The types of the constructor invocation's value
2871 * arguments.
2872 * @param typeargtypes The types of the constructor invocation's type
2873 * arguments.
2874 */
2875 Symbol resolveConstructor(DiagnosticPosition pos,
2876 Env<AttrContext> env,
2877 Type site,
2878 List<Type> argtypes,
2879 List<Type> typeargtypes) {
2880 return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
2881 }
2882
2883 private Symbol resolveConstructor(MethodResolutionContext resolveContext,
2884 final DiagnosticPosition pos,
2885 Env<AttrContext> env,
2886 Type site,
2887 List<Type> argtypes,
2888 List<Type> typeargtypes) {
2889 return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2890 @Override
2891 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2892 return findConstructor(pos, env, site, argtypes, typeargtypes,
2893 phase.isBoxingRequired(),
2894 phase.isVarargsRequired());
2895 }
2896 });
2897 }
2898
2899 /** Resolve a constructor, throw a fatal error if not found.
2900 * @param pos The position to use for error reporting.
2901 * @param env The environment current at the method invocation.
2902 * @param site The type to be constructed.
2903 * @param argtypes The types of the invocation's value arguments.
2904 * @param typeargtypes The types of the invocation's type arguments.
2905 */
2906 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2907 Type site,
2908 List<Type> argtypes,
2909 List<Type> typeargtypes) {
2910 MethodResolutionContext resolveContext = new MethodResolutionContext();
2911 resolveContext.internalResolution = true;
2912 Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
2913 if (sym.kind == MTH) return (MethodSymbol)sym;
2914 else throw new FatalError(
2915 diags.fragment(Fragments.FatalErrCantLocateCtor(site)));
2916 }
2917
2918 Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2919 Type site, List<Type> argtypes,
2920 List<Type> typeargtypes,
2921 boolean allowBoxing,
2922 boolean useVarargs) {
2923 Symbol sym = findMethod(env, site,
2924 names.init, argtypes,
2925 typeargtypes, allowBoxing,
2926 useVarargs);
2927 chk.checkDeprecated(pos, env.info.scope.owner, sym);
2928 chk.checkPreview(pos, env.info.scope.owner, sym);
2929 return sym;
2930 }
2931
2932 /** Resolve constructor using diamond inference.
2933 * @param pos The position to use for error reporting.
2934 * @param env The environment current at the constructor invocation.
2935 * @param site The type of class for which a constructor is searched.
2936 * The scope of this class has been touched in attribution.
2937 * @param argtypes The types of the constructor invocation's value
2938 * arguments.
2939 * @param typeargtypes The types of the constructor invocation's type
2940 * arguments.
2941 */
2942 Symbol resolveDiamond(DiagnosticPosition pos,
2943 Env<AttrContext> env,
2944 Type site,
2945 List<Type> argtypes,
2946 List<Type> typeargtypes) {
2947 return lookupMethod(env, pos, site.tsym, resolveMethodCheck,
2948 new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2949 @Override
2950 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2951 return findDiamond(pos, env, site, argtypes, typeargtypes,
2952 phase.isBoxingRequired(),
2953 phase.isVarargsRequired());
2954 }
2955 @Override
2956 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2957 if (sym.kind.isResolutionError()) {
2958 if (sym.kind != WRONG_MTH &&
2959 sym.kind != WRONG_MTHS) {
2960 sym = super.access(env, pos, location, sym);
2961 } else {
2962 sym = new DiamondError(sym, currentResolutionContext);
2963 sym = accessMethod(sym, pos, site, names.init, true, argtypes, typeargtypes);
2964 env.info.pendingResolutionPhase = currentResolutionContext.step;
2965 }
2966 }
2967 return sym;
2968 }});
2969 }
2970
2971 /** Find the constructor using diamond inference and do some checks(deprecated and preview).
2972 * @param pos The position to use for error reporting.
2973 * @param env The environment current at the constructor invocation.
2974 * @param site The type of class for which a constructor is searched.
2975 * The scope of this class has been touched in attribution.
2976 * @param argtypes The types of the constructor invocation's value arguments.
2977 * @param typeargtypes The types of the constructor invocation's type arguments.
2978 * @param allowBoxing Allow boxing conversions of arguments.
2979 * @param useVarargs Box trailing arguments into an array for varargs.
2980 */
2981 private Symbol findDiamond(DiagnosticPosition pos,
2982 Env<AttrContext> env,
2983 Type site,
2984 List<Type> argtypes,
2985 List<Type> typeargtypes,
2986 boolean allowBoxing,
2987 boolean useVarargs) {
2988 Symbol sym = findDiamond(env, site, argtypes, typeargtypes, allowBoxing, useVarargs);
2989 chk.checkDeprecated(pos, env.info.scope.owner, sym);
2990 chk.checkPreview(pos, env.info.scope.owner, sym);
2991 return sym;
2992 }
2993
2994 /** This method scans all the constructor symbol in a given class scope -
2995 * assuming that the original scope contains a constructor of the kind:
2996 * {@code Foo(X x, Y y)}, where X,Y are class type-variables declared in Foo,
2997 * a method check is executed against the modified constructor type:
2998 * {@code <X,Y>Foo<X,Y>(X x, Y y)}. This is crucial in order to enable diamond
2999 * inference. The inferred return type of the synthetic constructor IS
3000 * the inferred type for the diamond operator.
3001 */
3002 private Symbol findDiamond(Env<AttrContext> env,
3003 Type site,
3004 List<Type> argtypes,
3005 List<Type> typeargtypes,
3006 boolean allowBoxing,
3007 boolean useVarargs) {
3008 Symbol bestSoFar = methodNotFound;
3009 TypeSymbol tsym = site.tsym.isInterface() ? syms.objectType.tsym : site.tsym;
3010 for (final Symbol sym : tsym.members().getSymbolsByName(names.init)) {
3011 //- System.out.println(" e " + e.sym);
3012 if (sym.kind == MTH &&
3013 (sym.flags_field & SYNTHETIC) == 0) {
3014 List<Type> oldParams = sym.type.hasTag(FORALL) ?
3015 ((ForAll)sym.type).tvars :
3016 List.nil();
3017 Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
3018 types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
3019 MethodSymbol newConstr = new MethodSymbol(sym.flags(), names.init, constrType, site.tsym) {
3020 @Override
3021 public Symbol baseSymbol() {
3022 return sym;
3023 }
3024 };
3025 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
3026 newConstr,
3027 bestSoFar,
3028 allowBoxing,
3029 useVarargs);
3030 }
3031 }
3032 return bestSoFar;
3033 }
3034
3035 Symbol getMemberReference(DiagnosticPosition pos,
3036 Env<AttrContext> env,
3037 JCMemberReference referenceTree,
3038 Type site,
3039 Name name) {
3040
3041 site = types.capture(site);
3042
3043 ReferenceLookupHelper lookupHelper = makeReferenceLookupHelper(
3044 referenceTree, site, name, List.nil(), null, VARARITY);
3045
3046 Env<AttrContext> newEnv = env.dup(env.tree, env.info.dup());
3047 Symbol sym = lookupMethod(newEnv, env.tree.pos(), site.tsym,
3048 nilMethodCheck, lookupHelper);
3049
3050 env.info.pendingResolutionPhase = newEnv.info.pendingResolutionPhase;
3051
3052 return sym;
3053 }
3054
3055 ReferenceLookupHelper makeReferenceLookupHelper(JCMemberReference referenceTree,
3056 Type site,
3057 Name name,
3058 List<Type> argtypes,
3059 List<Type> typeargtypes,
3060 MethodResolutionPhase maxPhase) {
3061 if (!name.equals(names.init)) {
3062 //method reference
3063 return new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
3064 } else if (site.hasTag(ARRAY)) {
3065 //array constructor reference
3066 return new ArrayConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
3067 } else {
3068 //class constructor reference
3069 return new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
3070 }
3071 }
3072
3073 /**
3074 * Resolution of member references is typically done as a single
3075 * overload resolution step, where the argument types A are inferred from
3076 * the target functional descriptor.
3077 *
3078 * If the member reference is a method reference with a type qualifier,
3079 * a two-step lookup process is performed. The first step uses the
3080 * expected argument list A, while the second step discards the first
3081 * type from A (which is treated as a receiver type).
3082 *
3083 * There are two cases in which inference is performed: (i) if the member
3084 * reference is a constructor reference and the qualifier type is raw - in
3085 * which case diamond inference is used to infer a parameterization for the
3086 * type qualifier; (ii) if the member reference is an unbound reference
3087 * where the type qualifier is raw - in that case, during the unbound lookup
3088 * the receiver argument type is used to infer an instantiation for the raw
3089 * qualifier type.
3090 *
3091 * When a multi-step resolution process is exploited, the process of picking
3092 * the resulting symbol is delegated to an helper class {@link com.sun.tools.javac.comp.Resolve.ReferenceChooser}.
3093 *
3094 * This routine returns a pair (T,S), where S is the member reference symbol,
3095 * and T is the type of the class in which S is defined. This is necessary as
3096 * the type T might be dynamically inferred (i.e. if constructor reference
3097 * has a raw qualifier).
3098 */
3099 Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(Env<AttrContext> env,
3100 JCMemberReference referenceTree,
3101 Type site,
3102 Name name,
3103 List<Type> argtypes,
3104 List<Type> typeargtypes,
3105 Type descriptor,
3106 MethodCheck methodCheck,
3107 InferenceContext inferenceContext,
3108 ReferenceChooser referenceChooser) {
3109
3110 //step 1 - bound lookup
3111 ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
3112 referenceTree, site, name, argtypes, typeargtypes, VARARITY);
3113 Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
3114 MethodResolutionContext boundSearchResolveContext = new MethodResolutionContext();
3115 boundSearchResolveContext.methodCheck = methodCheck;
3116 Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(),
3117 site.tsym, boundSearchResolveContext, boundLookupHelper);
3118 boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
3119 ReferenceLookupResult boundRes = new ReferenceLookupResult(boundSym, boundSearchResolveContext, isStaticSelector);
3120 if (dumpMethodReferenceSearchResults) {
3121 dumpMethodReferenceSearchResults(referenceTree, boundSearchResolveContext, boundSym, true);
3122 }
3123
3124 //step 2 - unbound lookup
3125 Symbol unboundSym = methodNotFound;
3126 Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
3127 ReferenceLookupHelper unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
3128 ReferenceLookupResult unboundRes = referenceNotFound;
3129 if (unboundLookupHelper != null) {
3130 MethodResolutionContext unboundSearchResolveContext =
3131 new MethodResolutionContext();
3132 unboundSearchResolveContext.methodCheck = methodCheck;
3133 unboundSym = lookupMethod(unboundEnv, env.tree.pos(),
3134 site.tsym, unboundSearchResolveContext, unboundLookupHelper);
3135 unboundRes = new ReferenceLookupResult(unboundSym, unboundSearchResolveContext, isStaticSelector);
3136 if (dumpMethodReferenceSearchResults) {
3137 dumpMethodReferenceSearchResults(referenceTree, unboundSearchResolveContext, unboundSym, false);
3138 }
3139 }
3140
3141 //merge results
3142 Pair<Symbol, ReferenceLookupHelper> res;
3143 ReferenceLookupResult bestRes = referenceChooser.result(boundRes, unboundRes);
3144 res = new Pair<>(bestRes.sym,
3145 bestRes == unboundRes ? unboundLookupHelper : boundLookupHelper);
3146 env.info.pendingResolutionPhase = bestRes == unboundRes ?
3147 unboundEnv.info.pendingResolutionPhase :
3148 boundEnv.info.pendingResolutionPhase;
3149
3150 if (!res.fst.kind.isResolutionError()) {
3151 //handle sigpoly method references
3152 MethodSymbol msym = (MethodSymbol)res.fst;
3153 if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
3154 env.info.pendingResolutionPhase = BASIC;
3155 res = new Pair<>(findPolymorphicSignatureInstance(msym, descriptor), res.snd);
3156 }
3157 }
3158
3159 return res;
3160 }
3161
3162 private void dumpMethodReferenceSearchResults(JCMemberReference referenceTree,
3163 MethodResolutionContext resolutionContext,
3164 Symbol bestSoFar,
3165 boolean bound) {
3166 ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
3167 int pos = 0;
3168 int mostSpecificPos = -1;
3169 for (Candidate c : resolutionContext.candidates) {
3170 if (resolutionContext.step != c.step || !c.isApplicable()) {
3171 continue;
3172 } else {
3173 JCDiagnostic subDiag = null;
3174 if (c.sym.type.hasTag(FORALL)) {
3175 subDiag = diags.fragment(Fragments.PartialInstSig(c.mtype));
3176 }
3177
3178 String key = subDiag == null ?
3179 "applicable.method.found.2" :
3180 "applicable.method.found.3";
3181 subDiags.append(diags.fragment(key, pos,
3182 c.sym.isStatic() ? Fragments.Static : Fragments.NonStatic, c.sym, subDiag));
3183 if (c.sym == bestSoFar)
3184 mostSpecificPos = pos;
3185 pos++;
3186 }
3187 }
3188 JCDiagnostic main = diags.note(
3189 log.currentSource(),
3190 referenceTree,
3191 "method.ref.search.results.multi",
3192 bound ? Fragments.Bound : Fragments.Unbound,
3193 referenceTree.toString(), mostSpecificPos);
3194 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
3195 log.report(d);
3196 }
3197
3198 /**
3199 * This class is used to represent a method reference lookup result. It keeps track of two
3200 * things: (i) the symbol found during a method reference lookup and (ii) the static kind
3201 * of the lookup (see {@link com.sun.tools.javac.comp.Resolve.ReferenceLookupResult.StaticKind}).
3202 */
3203 static class ReferenceLookupResult {
3204
3205 /**
3206 * Static kind associated with a method reference lookup. Erroneous lookups end up with
3207 * the UNDEFINED kind; successful lookups will end up with either STATIC, NON_STATIC,
3208 * depending on whether all applicable candidates are static or non-static methods,
3209 * respectively. If a successful lookup has both static and non-static applicable methods,
3210 * its kind is set to BOTH.
3211 */
3212 enum StaticKind {
3213 STATIC,
3214 NON_STATIC,
3215 BOTH,
3216 UNDEFINED;
3217
3218 /**
3219 * Retrieve the static kind associated with a given (method) symbol.
3220 */
3221 static StaticKind from(Symbol s) {
3222 return s.isStatic() ?
3223 STATIC : NON_STATIC;
3224 }
3225
3226 /**
3227 * Merge two static kinds together.
3228 */
3229 static StaticKind reduce(StaticKind sk1, StaticKind sk2) {
3230 if (sk1 == UNDEFINED) {
3231 return sk2;
3232 } else if (sk2 == UNDEFINED) {
3233 return sk1;
3234 } else {
3235 return sk1 == sk2 ? sk1 : BOTH;
3236 }
3237 }
3238 }
3239
3240 /** The static kind. */
3241 StaticKind staticKind;
3242
3243 /** The lookup result. */
3244 Symbol sym;
3245
3246 ReferenceLookupResult(Symbol sym, MethodResolutionContext resolutionContext, boolean isStaticSelector) {
3247 this(sym, staticKind(sym, resolutionContext, isStaticSelector));
3248 }
3249
3250 private ReferenceLookupResult(Symbol sym, StaticKind staticKind) {
3251 this.staticKind = staticKind;
3252 this.sym = sym;
3253 }
3254
3255 private static StaticKind staticKind(Symbol sym, MethodResolutionContext resolutionContext, boolean isStaticSelector) {
3256 if (sym.kind == MTH && !isStaticSelector) {
3257 return StaticKind.from(sym);
3258 } else if (sym.kind == MTH || sym.kind == AMBIGUOUS) {
3259 return resolutionContext.candidates.stream()
3260 .filter(c -> c.isApplicable() && c.step == resolutionContext.step)
3261 .map(c -> StaticKind.from(c.sym))
3262 .reduce(StaticKind::reduce)
3263 .orElse(StaticKind.UNDEFINED);
3264 } else {
3265 return StaticKind.UNDEFINED;
3266 }
3267 }
3268
3269 /**
3270 * Does this result corresponds to a successful lookup (i.e. one where a method has been found?)
3271 */
3272 boolean isSuccess() {
3273 return staticKind != StaticKind.UNDEFINED;
3274 }
3275
3276 /**
3277 * Does this result have given static kind?
3278 */
3279 boolean hasKind(StaticKind sk) {
3280 return this.staticKind == sk;
3281 }
3282
3283 /**
3284 * Error recovery helper: can this lookup result be ignored (for the purpose of returning
3285 * some 'better' result) ?
3286 */
3287 boolean canIgnore() {
3288 switch (sym.kind) {
3289 case ABSENT_MTH:
3290 return true;
3291 case WRONG_MTH:
3292 InapplicableSymbolError errSym =
3293 (InapplicableSymbolError)sym.baseSymbol();
3294 return new Template(MethodCheckDiag.ARITY_MISMATCH.regex())
3295 .matches(errSym.errCandidate().snd);
3296 case WRONG_MTHS:
3297 InapplicableSymbolsError errSyms =
3298 (InapplicableSymbolsError)sym.baseSymbol();
3299 return errSyms.filterCandidates(errSyms.mapCandidates()).isEmpty();
3300 default:
3301 return false;
3302 }
3303 }
3304
3305 static ReferenceLookupResult error(Symbol sym) {
3306 return new ReferenceLookupResult(sym, StaticKind.UNDEFINED);
3307 }
3308 }
3309
3310 /**
3311 * This abstract class embodies the logic that converts one (bound lookup) or two (unbound lookup)
3312 * {@code ReferenceLookupResult} objects into a {@code Symbol}, which is then regarded as the
3313 * result of method reference resolution.
3314 */
3315 abstract class ReferenceChooser {
3316 /**
3317 * Generate a result from a pair of lookup result objects. This method delegates to the
3318 * appropriate result generation routine.
3319 */
3320 ReferenceLookupResult result(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3321 return unboundRes != referenceNotFound ?
3322 unboundResult(boundRes, unboundRes) :
3323 boundResult(boundRes);
3324 }
3325
3326 /**
3327 * Generate a symbol from a given bound lookup result.
3328 */
3329 abstract ReferenceLookupResult boundResult(ReferenceLookupResult boundRes);
3330
3331 /**
3332 * Generate a symbol from a pair of bound/unbound lookup results.
3333 */
3334 abstract ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes);
3335 }
3336
3337 /**
3338 * This chooser implements the selection strategy used during a full lookup; this logic
3339 * is described in JLS SE 8 (15.3.2).
3340 */
3341 ReferenceChooser basicReferenceChooser = new ReferenceChooser() {
3342
3343 @Override
3344 ReferenceLookupResult boundResult(ReferenceLookupResult boundRes) {
3345 return !boundRes.isSuccess() || boundRes.hasKind(StaticKind.NON_STATIC) ?
3346 boundRes : //the search produces a non-static method
3347 ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.sym, false));
3348 }
3349
3350 @Override
3351 ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3352 if (boundRes.isSuccess() && boundRes.sym.isStatic() &&
3353 (!unboundRes.isSuccess() || unboundRes.hasKind(StaticKind.STATIC))) {
3354 //the first search produces a static method and no non-static method is applicable
3355 //during the second search
3356 return boundRes;
3357 } else if (unboundRes.isSuccess() && !unboundRes.sym.isStatic() &&
3358 (!boundRes.isSuccess() || boundRes.hasKind(StaticKind.NON_STATIC))) {
3359 //the second search produces a non-static method and no static method is applicable
3360 //during the first search
3361 return unboundRes;
3362 } else if (boundRes.isSuccess() && unboundRes.isSuccess()) {
3363 //both searches produce some result; ambiguity (error recovery)
3364 return ReferenceLookupResult.error(ambiguityError(boundRes.sym, unboundRes.sym));
3365 } else if (boundRes.isSuccess() || unboundRes.isSuccess()) {
3366 //Both searches failed to produce a result with correct staticness (i.e. first search
3367 //produces an non-static method). Alternatively, a given search produced a result
3368 //with the right staticness, but the other search has applicable methods with wrong
3369 //staticness (error recovery)
3370 return ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.isSuccess() ?
3371 boundRes.sym : unboundRes.sym, true));
3372 } else {
3373 //both searches fail to produce a result - pick 'better' error using heuristics (error recovery)
3374 return (boundRes.canIgnore() && !unboundRes.canIgnore()) ?
3375 unboundRes : boundRes;
3376 }
3377 }
3378 };
3379
3380 /**
3381 * This chooser implements the selection strategy used during an arity-based lookup; this logic
3382 * is described in JLS SE 8 (15.12.2.1).
3383 */
3384 ReferenceChooser structuralReferenceChooser = new ReferenceChooser() {
3385
3386 @Override
3387 ReferenceLookupResult boundResult(ReferenceLookupResult boundRes) {
3388 return (!boundRes.isSuccess() || !boundRes.hasKind(StaticKind.STATIC)) ?
3389 boundRes : //the search has at least one applicable non-static method
3390 ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.sym, false));
3391 }
3392
3393 @Override
3394 ReferenceLookupResult unboundResult(ReferenceLookupResult boundRes, ReferenceLookupResult unboundRes) {
3395 if (boundRes.isSuccess() && !boundRes.hasKind(StaticKind.NON_STATIC)) {
3396 //the first search has at least one applicable static method
3397 return boundRes;
3398 } else if (unboundRes.isSuccess() && !unboundRes.hasKind(StaticKind.STATIC)) {
3399 //the second search has at least one applicable non-static method
3400 return unboundRes;
3401 } else if (boundRes.isSuccess() || unboundRes.isSuccess()) {
3402 //either the first search produces a non-static method, or second search produces
3403 //a non-static method (error recovery)
3404 return ReferenceLookupResult.error(new BadMethodReferenceError(boundRes.isSuccess() ?
3405 boundRes.sym : unboundRes.sym, true));
3406 } else {
3407 //both searches fail to produce a result - pick 'better' error using heuristics (error recovery)
3408 return (boundRes.canIgnore() && !unboundRes.canIgnore()) ?
3409 unboundRes : boundRes;
3410 }
3411 }
3412 };
3413
3414 /**
3415 * Helper for defining custom method-like lookup logic; a lookup helper
3416 * provides hooks for (i) the actual lookup logic and (ii) accessing the
3417 * lookup result (this step might result in compiler diagnostics to be generated)
3418 */
3419 abstract class LookupHelper {
3420
3421 /** name of the symbol to lookup */
3422 Name name;
3423
3424 /** location in which the lookup takes place */
3425 Type site;
3426
3427 /** actual types used during the lookup */
3428 List<Type> argtypes;
3429
3430 /** type arguments used during the lookup */
3431 List<Type> typeargtypes;
3432
3433 /** Max overload resolution phase handled by this helper */
3434 MethodResolutionPhase maxPhase;
3435
3436 LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3437 this.name = name;
3438 this.site = site;
3439 this.argtypes = argtypes;
3440 this.typeargtypes = typeargtypes;
3441 this.maxPhase = maxPhase;
3442 }
3443
3444 /**
3445 * Should lookup stop at given phase with given result
3446 */
3447 final boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
3448 return phase.ordinal() > maxPhase.ordinal() ||
3449 !sym.kind.isResolutionError() || sym.kind == AMBIGUOUS || sym.kind == STATICERR;
3450 }
3451
3452 /**
3453 * Search for a symbol under a given overload resolution phase - this method
3454 * is usually called several times, once per each overload resolution phase
3455 */
3456 abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
3457
3458 /**
3459 * Dump overload resolution info
3460 */
3461 void debug(DiagnosticPosition pos, Symbol sym) {
3462 //do nothing
3463 }
3464
3465 /**
3466 * Validate the result of the lookup
3467 */
3468 abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
3469 }
3470
3471 abstract class BasicLookupHelper extends LookupHelper {
3472
3473 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
3474 this(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
3475 }
3476
3477 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3478 super(name, site, argtypes, typeargtypes, maxPhase);
3479 }
3480
3481 @Override
3482 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3483 Symbol sym = doLookup(env, phase);
3484 if (sym.kind == AMBIGUOUS) {
3485 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3486 sym = a_err.mergeAbstracts(site);
3487 }
3488 return sym;
3489 }
3490
3491 abstract Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase);
3492
3493 @Override
3494 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3495 if (sym.kind.isResolutionError()) {
3496 //if nothing is found return the 'first' error
3497 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
3498 }
3499 return sym;
3500 }
3501
3502 @Override
3503 void debug(DiagnosticPosition pos, Symbol sym) {
3504 reportVerboseResolutionDiagnostic(pos, name, site, argtypes, typeargtypes, sym);
3505 }
3506 }
3507
3508 /**
3509 * Helper class for member reference lookup. A reference lookup helper
3510 * defines the basic logic for member reference lookup; a method gives
3511 * access to an 'unbound' helper used to perform an unbound member
3512 * reference lookup.
3513 */
3514 abstract class ReferenceLookupHelper extends LookupHelper {
3515
3516 /** The member reference tree */
3517 JCMemberReference referenceTree;
3518
3519 ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3520 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3521 super(name, site, argtypes, typeargtypes, maxPhase);
3522 this.referenceTree = referenceTree;
3523 }
3524
3525 /**
3526 * Returns an unbound version of this lookup helper. By default, this
3527 * method returns an dummy lookup helper.
3528 */
3529 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3530 return null;
3531 }
3532
3533 /**
3534 * Get the kind of the member reference
3535 */
3536 abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
3537
3538 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3539 if (sym.kind == AMBIGUOUS) {
3540 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
3541 sym = a_err.mergeAbstracts(site);
3542 }
3543 //skip error reporting
3544 return sym;
3545 }
3546 }
3547
3548 /**
3549 * Helper class for method reference lookup. The lookup logic is based
3550 * upon Resolve.findMethod; in certain cases, this helper class has a
3551 * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
3552 * In such cases, non-static lookup results are thrown away.
3553 */
3554 class MethodReferenceLookupHelper extends ReferenceLookupHelper {
3555
3556 /** The original method reference lookup site. */
3557 Type originalSite;
3558
3559 MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3560 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3561 super(referenceTree, name, types.skipTypeVars(site, true), argtypes, typeargtypes, maxPhase);
3562 this.originalSite = site;
3563 }
3564
3565 @Override
3566 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3567 return findMethod(env, site, name, argtypes, typeargtypes,
3568 phase.isBoxingRequired(), phase.isVarargsRequired());
3569 }
3570
3571 @Override
3572 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3573 if (TreeInfo.isStaticSelector(referenceTree.expr, names)) {
3574 if (argtypes.nonEmpty() &&
3575 (argtypes.head.hasTag(NONE) ||
3576 types.isSubtypeUnchecked(inferenceContext.asUndetVar(argtypes.head), originalSite))) {
3577 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
3578 originalSite, argtypes, typeargtypes, maxPhase);
3579 } else {
3580 return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
3581 @Override
3582 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3583 return this;
3584 }
3585
3586 @Override
3587 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3588 return methodNotFound;
3589 }
3590
3591 @Override
3592 ReferenceKind referenceKind(Symbol sym) {
3593 Assert.error();
3594 return null;
3595 }
3596 };
3597 }
3598 } else {
3599 return super.unboundLookup(inferenceContext);
3600 }
3601 }
3602
3603 @Override
3604 ReferenceKind referenceKind(Symbol sym) {
3605 if (sym.isStatic()) {
3606 return ReferenceKind.STATIC;
3607 } else {
3608 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
3609 return selName != null && selName == names._super ?
3610 ReferenceKind.SUPER :
3611 ReferenceKind.BOUND;
3612 }
3613 }
3614
3615 @Override
3616 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
3617 if (originalSite.hasTag(TYPEVAR) && sym.kind == MTH) {
3618 sym = (sym.flags() & Flags.PRIVATE) != 0 ?
3619 new AccessError(env, site, sym) :
3620 sym;
3621 return accessBase(sym, pos, location, originalSite, name, true);
3622 } else {
3623 return super.access(env, pos, location, sym);
3624 }
3625 }
3626 }
3627
3628 /**
3629 * Helper class for unbound method reference lookup. Essentially the same
3630 * as the basic method reference lookup helper; main difference is that static
3631 * lookup results are thrown away. If qualifier type is raw, an attempt to
3632 * infer a parameterized type is made using the first actual argument (that
3633 * would otherwise be ignored during the lookup).
3634 */
3635 class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
3636
3637 UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
3638 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3639 super(referenceTree, name, site, argtypes.tail, typeargtypes, maxPhase);
3640 if (site.isRaw() && !argtypes.head.hasTag(NONE)) {
3641 Type asSuperSite = types.asSuper(argtypes.head, site.tsym);
3642 this.site = types.skipTypeVars(asSuperSite, true);
3643 }
3644 }
3645
3646 @Override
3647 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
3648 return this;
3649 }
3650
3651 @Override
3652 ReferenceKind referenceKind(Symbol sym) {
3653 return ReferenceKind.UNBOUND;
3654 }
3655 }
3656
3657 /**
3658 * Helper class for array constructor lookup; an array constructor lookup
3659 * is simulated by looking up a method that returns the array type specified
3660 * as qualifier, and that accepts a single int parameter (size of the array).
3661 */
3662 class ArrayConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3663
3664 ArrayConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3665 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3666 super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
3667 }
3668
3669 @Override
3670 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3671 WriteableScope sc = WriteableScope.create(syms.arrayClass);
3672 MethodSymbol arrayConstr = new MethodSymbol(PUBLIC, name, null, site.tsym);
3673 arrayConstr.type = new MethodType(List.of(syms.intType), site, List.nil(), syms.methodClass);
3674 sc.enter(arrayConstr);
3675 return findMethodInScope(env, site, name, argtypes, typeargtypes, sc, methodNotFound, phase.isBoxingRequired(), phase.isVarargsRequired(), false);
3676 }
3677
3678 @Override
3679 ReferenceKind referenceKind(Symbol sym) {
3680 return ReferenceKind.ARRAY_CTOR;
3681 }
3682 }
3683
3684 /**
3685 * Helper class for constructor reference lookup. The lookup logic is based
3686 * upon either Resolve.findMethod or Resolve.findDiamond - depending on
3687 * whether the constructor reference needs diamond inference (this is the case
3688 * if the qualifier type is raw). A special erroneous symbol is returned
3689 * if the lookup returns the constructor of an inner class and there's no
3690 * enclosing instance in scope.
3691 */
3692 class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
3693
3694 boolean needsInference;
3695
3696 ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
3697 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
3698 super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
3699 if (site.isRaw()) {
3700 this.site = new ClassType(site.getEnclosingType(),
3701 !(site.tsym.isInner() && site.getEnclosingType().isRaw()) ?
3702 site.tsym.type.getTypeArguments() : List.nil(), site.tsym, site.getMetadata());
3703 needsInference = true;
3704 }
3705 }
3706
3707 @Override
3708 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
3709 Symbol sym = needsInference ?
3710 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
3711 findMethod(env, site, name, argtypes, typeargtypes,
3712 phase.isBoxingRequired(), phase.isVarargsRequired());
3713 return enclosingInstanceMissing(env, site) ? new BadConstructorReferenceError(sym) : sym;
3714 }
3715
3716 @Override
3717 ReferenceKind referenceKind(Symbol sym) {
3718 return site.getEnclosingType().hasTag(NONE) ?
3719 ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
3720 }
3721 }
3722
3723 /**
3724 * Main overload resolution routine. On each overload resolution step, a
3725 * lookup helper class is used to perform the method/constructor lookup;
3726 * at the end of the lookup, the helper is used to validate the results
3727 * (this last step might trigger overload resolution diagnostics).
3728 */
3729 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, MethodCheck methodCheck, LookupHelper lookupHelper) {
3730 MethodResolutionContext resolveContext = new MethodResolutionContext();
3731 resolveContext.methodCheck = methodCheck;
3732 return lookupMethod(env, pos, location, resolveContext, lookupHelper);
3733 }
3734
3735 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
3736 MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
3737 MethodResolutionContext prevResolutionContext = currentResolutionContext;
3738 try {
3739 Symbol bestSoFar = methodNotFound;
3740 currentResolutionContext = resolveContext;
3741 for (MethodResolutionPhase phase : methodResolutionSteps) {
3742 if (lookupHelper.shouldStop(bestSoFar, phase))
3743 break;
3744 MethodResolutionPhase prevPhase = currentResolutionContext.step;
3745 Symbol prevBest = bestSoFar;
3746 currentResolutionContext.step = phase;
3747 Symbol sym = lookupHelper.lookup(env, phase);
3748 lookupHelper.debug(pos, sym);
3749 bestSoFar = phase.mergeResults(bestSoFar, sym);
3750 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
3751 }
3752 return lookupHelper.access(env, pos, location, bestSoFar);
3753 } finally {
3754 currentResolutionContext = prevResolutionContext;
3755 }
3756 }
3757
3758 /**
3759 * Resolve `c.name' where name == this or name == super.
3760 * @param pos The position to use for error reporting.
3761 * @param env The environment current at the expression.
3762 * @param c The qualifier.
3763 * @param name The identifier's name.
3764 */
3765 Symbol resolveSelf(DiagnosticPosition pos,
3766 Env<AttrContext> env,
3767 TypeSymbol c,
3768 Name name) {
3769 Env<AttrContext> env1 = env;
3770 boolean staticOnly = false;
3771 while (env1.outer != null) {
3772 if (isStatic(env1)) staticOnly = true;
3773 if (env1.enclClass.sym == c) {
3774 Symbol sym = env1.info.scope.findFirst(name);
3775 if (sym != null) {
3776 if (staticOnly)
3777 sym = new StaticError(sym);
3778 else if (env1.info.ctorPrologue)
3779 sym = new RefBeforeCtorCalledError(sym);
3780 return accessBase(sym, pos, env.enclClass.sym.type,
3781 name, true);
3782 }
3783 }
3784 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
3785 env1 = env1.outer;
3786 }
3787 if (c.isInterface() &&
3788 name == names._super && !isStatic(env) &&
3789 types.isDirectSuperInterface(c, env.enclClass.sym)) {
3790 //this might be a default super call if one of the superinterfaces is 'c'
3791 for (Type t : pruneInterfaces(env.enclClass.type)) {
3792 if (t.tsym == c) {
3793 if (env.info.ctorPrologue)
3794 log.error(pos, Errors.CantRefBeforeCtorCalled(name));
3795 env.info.defaultSuperCallSite = t;
3796 return new VarSymbol(0, names._super,
3797 types.asSuper(env.enclClass.type, c), env.enclClass.sym);
3798 }
3799 }
3800 //find a direct supertype that is a subtype of 'c'
3801 for (Type i : types.directSupertypes(env.enclClass.type)) {
3802 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
3803 log.error(pos,
3804 Errors.IllegalDefaultSuperCall(c,
3805 Fragments.RedundantSupertype(c, i)));
3806 return syms.errSymbol;
3807 }
3808 }
3809 Assert.error();
3810 }
3811 log.error(pos, Errors.NotEnclClass(c));
3812 return syms.errSymbol;
3813 }
3814 //where
3815 private List<Type> pruneInterfaces(Type t) {
3816 ListBuffer<Type> result = new ListBuffer<>();
3817 for (Type t1 : types.interfaces(t)) {
3818 boolean shouldAdd = true;
3819 for (Type t2 : types.directSupertypes(t)) {
3820 if (t1 != t2 && !t2.hasTag(ERROR) && types.isSubtypeNoCapture(t2, t1)) {
3821 shouldAdd = false;
3822 }
3823 }
3824 if (shouldAdd) {
3825 result.append(t1);
3826 }
3827 }
3828 return result.toList();
3829 }
3830
3831
3832 /**
3833 * Resolve `c.this' for an enclosing class c that contains the
3834 * named member.
3835 * @param pos The position to use for error reporting.
3836 * @param env The environment current at the expression.
3837 * @param member The member that must be contained in the result.
3838 */
3839 Symbol resolveSelfContaining(DiagnosticPosition pos,
3840 Env<AttrContext> env,
3841 Symbol member,
3842 boolean isSuperCall) {
3843 Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
3844 if (sym == null) {
3845 log.error(pos, Errors.EnclClassRequired(member));
3846 return syms.errSymbol;
3847 } else {
3848 return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
3849 }
3850 }
3851
3852 boolean enclosingInstanceMissing(Env<AttrContext> env, Type type) {
3853 if (type.hasTag(CLASS) && type.getEnclosingType().hasTag(CLASS)) {
3854 Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
3855 return encl == null || encl.kind.isResolutionError();
3856 }
3857 return false;
3858 }
3859
3860 private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
3861 Symbol member,
3862 boolean isSuperCall) {
3863 Name name = names._this;
3864 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
3865 boolean staticOnly = false;
3866 if (env1 != null) {
3867 while (env1 != null && env1.outer != null) {
3868 if (isStatic(env1)) staticOnly = true;
3869 if (env1.enclClass.sym.isSubClass(member.owner.enclClass(), types)) {
3870 Symbol sym = env1.info.scope.findFirst(name);
3871 if (sym != null) {
3872 if (staticOnly) sym = new StaticError(sym);
3873 return sym;
3874 }
3875 }
3876 if ((env1.enclClass.sym.flags() & STATIC) != 0)
3877 staticOnly = true;
3878 env1 = env1.outer;
3879 }
3880 }
3881 return null;
3882 }
3883
3884 /**
3885 * Resolve an appropriate implicit this instance for t's container.
3886 * JLS 8.8.5.1 and 15.9.2
3887 */
3888 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
3889 return resolveImplicitThis(pos, env, t, false);
3890 }
3891
3892 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
3893 Type thisType = (t.tsym.owner.kind.matches(KindSelector.VAL_MTH)
3894 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
3895 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
3896 if (env.info.ctorPrologue && thisType.tsym == env.enclClass.sym) {
3897 log.error(pos, Errors.CantRefBeforeCtorCalled(names._this));
3898 }
3899 return thisType;
3900 }
3901
3902 /* ***************************************************************************
3903 * ResolveError classes, indicating error situations when accessing symbols
3904 ****************************************************************************/
3905
3906 //used by TransTypes when checking target type of synthetic cast
3907 public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
3908 AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
3909 logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
3910 }
3911 //where
3912 private void logResolveError(ResolveError error,
3913 DiagnosticPosition pos,
3914 Symbol location,
3915 Type site,
3916 Name name,
3917 List<Type> argtypes,
3918 List<Type> typeargtypes) {
3919 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
3920 pos, location, site, name, argtypes, typeargtypes);
3921 if (d != null) {
3922 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
3923 log.report(d);
3924 }
3925 }
3926
3927 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
3928
3929 public Object methodArguments(List<Type> argtypes) {
3930 if (argtypes == null || argtypes.isEmpty()) {
3931 return noArgs;
3932 } else {
3933 ListBuffer<Object> diagArgs = new ListBuffer<>();
3934 for (Type t : argtypes) {
3935 if (t.hasTag(DEFERRED)) {
3936 diagArgs.append(((DeferredAttr.DeferredType)t).tree);
3937 } else {
3938 diagArgs.append(t);
3939 }
3940 }
3941 return diagArgs;
3942 }
3943 }
3944
3945 /** check if a type is a subtype of Serializable, if that is available.*/
3946 boolean isSerializable(Type t) {
3947 try {
3948 syms.serializableType.complete();
3949 }
3950 catch (CompletionFailure e) {
3951 return false;
3952 }
3953 return types.isSubtype(t, syms.serializableType);
3954 }
3955
3956 /**
3957 * Root class for resolution errors. Subclass of ResolveError
3958 * represent a different kinds of resolution error - as such they must
3959 * specify how they map into concrete compiler diagnostics.
3960 */
3961 abstract class ResolveError extends Symbol {
3962
3963 /** The name of the kind of error, for debugging only. */
3964 final String debugName;
3965
3966 ResolveError(Kind kind, String debugName) {
3967 super(kind, 0, null, null, null);
3968 this.debugName = debugName;
3969 }
3970
3971 @Override @DefinedBy(Api.LANGUAGE_MODEL)
3972 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
3973 throw new AssertionError();
3974 }
3975
3976 @Override
3977 public String toString() {
3978 return debugName;
3979 }
3980
3981 @Override
3982 public boolean exists() {
3983 return false;
3984 }
3985
3986 @Override
3987 public boolean isStatic() {
3988 return false;
3989 }
3990
3991 /**
3992 * Create an external representation for this erroneous symbol to be
3993 * used during attribution - by default this returns the symbol of a
3994 * brand new error type which stores the original type found
3995 * during resolution.
3996 *
3997 * @param name the name used during resolution
3998 * @param location the location from which the symbol is accessed
3999 */
4000 protected Symbol access(Name name, TypeSymbol location) {
4001 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
4002 }
4003
4004 /**
4005 * Create a diagnostic representing this resolution error.
4006 *
4007 * @param dkind The kind of the diagnostic to be created (e.g error).
4008 * @param pos The position to be used for error reporting.
4009 * @param site The original type from where the selection took place.
4010 * @param name The name of the symbol to be resolved.
4011 * @param argtypes The invocation's value arguments,
4012 * if we looked for a method.
4013 * @param typeargtypes The invocation's type arguments,
4014 * if we looked for a method.
4015 */
4016 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4017 DiagnosticPosition pos,
4018 Symbol location,
4019 Type site,
4020 Name name,
4021 List<Type> argtypes,
4022 List<Type> typeargtypes);
4023 }
4024
4025 /**
4026 * This class is the root class of all resolution errors caused by
4027 * an invalid symbol being found during resolution.
4028 */
4029 abstract class InvalidSymbolError extends ResolveError {
4030
4031 /** The invalid symbol found during resolution */
4032 Symbol sym;
4033
4034 InvalidSymbolError(Kind kind, Symbol sym, String debugName) {
4035 super(kind, debugName);
4036 this.sym = sym;
4037 }
4038
4039 @Override
4040 public boolean exists() {
4041 return true;
4042 }
4043
4044 @Override
4045 public String toString() {
4046 return super.toString() + " wrongSym=" + sym;
4047 }
4048
4049 @Override
4050 public Symbol access(Name name, TypeSymbol location) {
4051 if (!sym.kind.isResolutionError() && sym.kind.matches(KindSelector.TYP))
4052 return types.createErrorType(name, location, sym.type).tsym;
4053 else
4054 return sym;
4055 }
4056 }
4057
4058 class BadRestrictedTypeError extends ResolveError {
4059 private final Name typeName;
4060 BadRestrictedTypeError(Name typeName) {
4061 super(Kind.BAD_RESTRICTED_TYPE, "bad var use");
4062 this.typeName = typeName;
4063 }
4064
4065 @Override
4066 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4067 return diags.create(dkind, log.currentSource(), pos, "illegal.ref.to.restricted.type", typeName);
4068 }
4069 }
4070
4071 /**
4072 * InvalidSymbolError error class indicating that a symbol matching a
4073 * given name does not exists in a given site.
4074 */
4075 class SymbolNotFoundError extends ResolveError {
4076
4077 SymbolNotFoundError(Kind kind) {
4078 this(kind, "symbol not found error");
4079 }
4080
4081 SymbolNotFoundError(Kind kind, String debugName) {
4082 super(kind, debugName);
4083 }
4084
4085 @Override
4086 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4087 DiagnosticPosition pos,
4088 Symbol location,
4089 Type site,
4090 Name name,
4091 List<Type> argtypes,
4092 List<Type> typeargtypes) {
4093 argtypes = argtypes == null ? List.nil() : argtypes;
4094 typeargtypes = typeargtypes == null ? List.nil() : typeargtypes;
4095 if (name == names.error)
4096 return null;
4097
4098 boolean hasLocation = false;
4099 if (location == null) {
4100 location = site.tsym;
4101 }
4102 if (!location.name.isEmpty()) {
4103 if (location.kind == PCK && !site.tsym.exists() && location.name != names.java) {
4104 return diags.create(dkind, log.currentSource(), pos,
4105 "doesnt.exist", location);
4106 }
4107 hasLocation = !location.name.equals(names._this) &&
4108 !location.name.equals(names._super);
4109 }
4110 boolean isConstructor = name == names.init;
4111 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : kind.absentKind();
4112 Name idname = isConstructor ? site.tsym.name : name;
4113 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
4114 if (hasLocation) {
4115 return diags.create(dkind, log.currentSource(), pos,
4116 errKey, kindname, idname, //symbol kindname, name
4117 typeargtypes, args(argtypes), //type parameters and arguments (if any)
4118 getLocationDiag(location, site)); //location kindname, type
4119 }
4120 else {
4121 return diags.create(dkind, log.currentSource(), pos,
4122 errKey, kindname, idname, //symbol kindname, name
4123 typeargtypes, args(argtypes)); //type parameters and arguments (if any)
4124 }
4125 }
4126 //where
4127 private Object args(List<Type> args) {
4128 return args.isEmpty() ? args : methodArguments(args);
4129 }
4130
4131 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
4132 String key = "cant.resolve";
4133 String suffix = hasLocation ? ".location" : "";
4134 switch (kindname) {
4135 case METHOD:
4136 case CONSTRUCTOR: {
4137 suffix += ".args";
4138 suffix += hasTypeArgs ? ".params" : "";
4139 }
4140 }
4141 return key + suffix;
4142 }
4143 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
4144 if (location.kind == VAR) {
4145 return diags.fragment(Fragments.Location1(kindName(location),
4146 location,
4147 location.type));
4148 } else {
4149 return diags.fragment(Fragments.Location(typeKindName(site),
4150 site,
4151 null));
4152 }
4153 }
4154 }
4155
4156 /**
4157 * InvalidSymbolError error class indicating that a given symbol
4158 * (either a method, a constructor or an operand) is not applicable
4159 * given an actual arguments/type argument list.
4160 */
4161 class InapplicableSymbolError extends ResolveError {
4162
4163 protected MethodResolutionContext resolveContext;
4164
4165 InapplicableSymbolError(MethodResolutionContext context) {
4166 this(WRONG_MTH, "inapplicable symbol error", context);
4167 }
4168
4169 protected InapplicableSymbolError(Kind kind, String debugName, MethodResolutionContext context) {
4170 super(kind, debugName);
4171 this.resolveContext = context;
4172 }
4173
4174 @Override
4175 public String toString() {
4176 return super.toString();
4177 }
4178
4179 @Override
4180 public boolean exists() {
4181 return true;
4182 }
4183
4184 @Override
4185 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4186 DiagnosticPosition pos,
4187 Symbol location,
4188 Type site,
4189 Name name,
4190 List<Type> argtypes,
4191 List<Type> typeargtypes) {
4192 if (name == names.error)
4193 return null;
4194
4195 Pair<Symbol, JCDiagnostic> c = errCandidate();
4196 Symbol ws = c.fst.asMemberOf(site, types);
4197 UnaryOperator<JCDiagnostic> rewriter = compactMethodDiags ?
4198 d -> MethodResolutionDiagHelper.rewrite(diags, pos, log.currentSource(), dkind, c.snd) : null;
4199
4200 // If the problem is due to type arguments, then the method parameters aren't relevant,
4201 // so use the error message that omits them to avoid confusion.
4202 switch (c.snd.getCode()) {
4203 case "compiler.misc.wrong.number.type.args":
4204 case "compiler.misc.explicit.param.do.not.conform.to.bounds":
4205 return diags.create(dkind, log.currentSource(), pos,
4206 "cant.apply.symbol.noargs",
4207 rewriter,
4208 kindName(ws),
4209 ws.name == names.init ? ws.owner.name : ws.name,
4210 kindName(ws.owner),
4211 ws.owner.type,
4212 c.snd);
4213 default:
4214 // Avoid saying "constructor Array in class Array"
4215 if (ws.owner == syms.arrayClass && ws.name == names.init) {
4216 return diags.create(dkind, log.currentSource(), pos,
4217 "cant.apply.array.ctor",
4218 rewriter,
4219 methodArguments(ws.type.getParameterTypes()),
4220 methodArguments(argtypes),
4221 c.snd);
4222 }
4223 return diags.create(dkind, log.currentSource(), pos,
4224 "cant.apply.symbol",
4225 rewriter,
4226 kindName(ws),
4227 ws.name == names.init ? ws.owner.name : ws.name,
4228 methodArguments(ws.type.getParameterTypes()),
4229 methodArguments(argtypes),
4230 kindName(ws.owner),
4231 ws.owner.type,
4232 c.snd);
4233 }
4234 }
4235
4236 @Override
4237 public Symbol access(Name name, TypeSymbol location) {
4238 Pair<Symbol, JCDiagnostic> cand = errCandidate();
4239 TypeSymbol errSymbol = types.createErrorType(name, location, cand != null ? cand.fst.type : syms.errSymbol.type).tsym;
4240 if (cand != null) {
4241 attrRecover.wrongMethodSymbolCandidate(errSymbol, cand.fst, cand.snd);
4242 }
4243 return errSymbol;
4244 }
4245
4246 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4247 Candidate bestSoFar = null;
4248 for (Candidate c : resolveContext.candidates) {
4249 if (c.isApplicable()) continue;
4250 bestSoFar = c;
4251 }
4252 Assert.checkNonNull(bestSoFar);
4253 return new Pair<>(bestSoFar.sym, bestSoFar.details);
4254 }
4255 }
4256
4257 /**
4258 * ResolveError error class indicating that a symbol (either methods, constructors or operand)
4259 * is not applicable given an actual arguments/type argument list.
4260 */
4261 class InapplicableSymbolsError extends InapplicableSymbolError {
4262
4263 InapplicableSymbolsError(MethodResolutionContext context) {
4264 super(WRONG_MTHS, "inapplicable symbols", context);
4265 }
4266
4267 @Override
4268 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4269 DiagnosticPosition pos,
4270 Symbol location,
4271 Type site,
4272 Name name,
4273 List<Type> argtypes,
4274 List<Type> typeargtypes) {
4275 Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
4276 Map<Symbol, JCDiagnostic> filteredCandidates = compactMethodDiags ?
4277 filterCandidates(candidatesMap) :
4278 mapCandidates();
4279 if (filteredCandidates.isEmpty()) {
4280 filteredCandidates = candidatesMap;
4281 }
4282 boolean truncatedDiag = candidatesMap.size() != filteredCandidates.size();
4283 if (filteredCandidates.size() > 1) {
4284 JCDiagnostic err = diags.create(dkind,
4285 null,
4286 truncatedDiag ?
4287 EnumSet.of(DiagnosticFlag.COMPRESSED) :
4288 EnumSet.noneOf(DiagnosticFlag.class),
4289 log.currentSource(),
4290 pos,
4291 "cant.apply.symbols",
4292 name == names.init ? KindName.CONSTRUCTOR : kind.absentKind(),
4293 name == names.init ? site.tsym.name : name,
4294 methodArguments(argtypes));
4295 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(filteredCandidates, site));
4296 } else if (filteredCandidates.size() == 1) {
4297 Map.Entry<Symbol, JCDiagnostic> _e =
4298 filteredCandidates.entrySet().iterator().next();
4299 final Pair<Symbol, JCDiagnostic> p = new Pair<>(_e.getKey(), _e.getValue());
4300 JCDiagnostic d = new InapplicableSymbolError(resolveContext) {
4301 @Override
4302 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4303 return p;
4304 }
4305 }.getDiagnostic(dkind, pos,
4306 location, site, name, argtypes, typeargtypes);
4307 if (truncatedDiag) {
4308 d.setFlag(DiagnosticFlag.COMPRESSED);
4309 }
4310 return d;
4311 } else {
4312 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
4313 location, site, name, argtypes, typeargtypes);
4314 }
4315 }
4316 //where
4317 private Map<Symbol, JCDiagnostic> mapCandidates() {
4318 MostSpecificMap candidates = new MostSpecificMap();
4319 for (Candidate c : resolveContext.candidates) {
4320 if (c.isApplicable()) continue;
4321 candidates.put(c);
4322 }
4323 return candidates;
4324 }
4325
4326 @SuppressWarnings("serial")
4327 private class MostSpecificMap extends LinkedHashMap<Symbol, JCDiagnostic> {
4328 private void put(Candidate c) {
4329 ListBuffer<Symbol> overridden = new ListBuffer<>();
4330 for (Symbol s : keySet()) {
4331 if (s == c.sym) {
4332 continue;
4333 }
4334 if (c.sym.overrides(s, (TypeSymbol)s.owner, types, false)) {
4335 overridden.add(s);
4336 } else if (s.overrides(c.sym, (TypeSymbol)c.sym.owner, types, false)) {
4337 return;
4338 }
4339 }
4340 for (Symbol s : overridden) {
4341 remove(s);
4342 }
4343 put(c.sym, c.details);
4344 }
4345 }
4346
4347 Map<Symbol, JCDiagnostic> filterCandidates(Map<Symbol, JCDiagnostic> candidatesMap) {
4348 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<>();
4349 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
4350 JCDiagnostic d = _entry.getValue();
4351 if (!new Template(MethodCheckDiag.ARITY_MISMATCH.regex()).matches(d)) {
4352 candidates.put(_entry.getKey(), d);
4353 }
4354 }
4355 return candidates;
4356 }
4357
4358 private List<JCDiagnostic> candidateDetails(Map<Symbol, JCDiagnostic> candidatesMap, Type site) {
4359 List<JCDiagnostic> details = List.nil();
4360 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
4361 Symbol sym = _entry.getKey();
4362 JCDiagnostic detailDiag =
4363 diags.fragment(Fragments.InapplicableMethod(Kinds.kindName(sym),
4364 sym.location(site, types),
4365 sym.asMemberOf(site, types),
4366 _entry.getValue()));
4367 details = details.prepend(detailDiag);
4368 }
4369 //typically members are visited in reverse order (see Scope)
4370 //so we need to reverse the candidate list so that candidates
4371 //conform to source order
4372 return details;
4373 }
4374
4375 @Override
4376 protected Pair<Symbol, JCDiagnostic> errCandidate() {
4377 Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
4378 Map<Symbol, JCDiagnostic> filteredCandidates = filterCandidates(candidatesMap);
4379 if (filteredCandidates.size() == 1) {
4380 return Pair.of(filteredCandidates.keySet().iterator().next(),
4381 filteredCandidates.values().iterator().next());
4382 }
4383 return null;
4384 }
4385 }
4386
4387 /**
4388 * DiamondError error class indicating that a constructor symbol is not applicable
4389 * given an actual arguments/type argument list using diamond inference.
4390 */
4391 class DiamondError extends InapplicableSymbolError {
4392
4393 Symbol sym;
4394
4395 public DiamondError(Symbol sym, MethodResolutionContext context) {
4396 super(sym.kind, "diamondError", context);
4397 this.sym = sym;
4398 }
4399
4400 JCDiagnostic getDetails() {
4401 return (sym.kind == WRONG_MTH) ?
4402 ((InapplicableSymbolError)sym.baseSymbol()).errCandidate().snd :
4403 null;
4404 }
4405
4406 @Override
4407 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
4408 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4409 JCDiagnostic details = getDetails();
4410 if (details != null && compactMethodDiags) {
4411 JCDiagnostic simpleDiag =
4412 MethodResolutionDiagHelper.rewrite(diags, pos, log.currentSource(), dkind, details);
4413 if (simpleDiag != null) {
4414 return simpleDiag;
4415 }
4416 }
4417 String key = details == null ?
4418 "cant.apply.diamond" :
4419 "cant.apply.diamond.1";
4420 return diags.create(dkind, log.currentSource(), pos, key,
4421 Fragments.Diamond(site.tsym), details);
4422 }
4423 }
4424
4425 /**
4426 * An InvalidSymbolError error class indicating that a symbol is not
4427 * accessible from a given site
4428 */
4429 class AccessError extends InvalidSymbolError {
4430
4431 private Env<AttrContext> env;
4432 private Type site;
4433
4434 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
4435 super(HIDDEN, sym, "access error");
4436 this.env = env;
4437 this.site = site;
4438 }
4439
4440 @Override
4441 public boolean exists() {
4442 return false;
4443 }
4444
4445 @Override
4446 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4447 DiagnosticPosition pos,
4448 Symbol location,
4449 Type site,
4450 Name name,
4451 List<Type> argtypes,
4452 List<Type> typeargtypes) {
4453 if (sym.name == names.init && sym.owner != site.tsym) {
4454 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
4455 pos, location, site, name, argtypes, typeargtypes);
4456 }
4457 else if ((sym.flags() & PUBLIC) != 0
4458 || (env != null && this.site != null
4459 && !isAccessible(env, this.site))) {
4460 if (sym.owner.kind == PCK) {
4461 return diags.create(dkind, log.currentSource(),
4462 pos, "not.def.access.package.cant.access",
4463 sym, sym.location(), inaccessiblePackageReason(env, sym.packge()));
4464 } else if ( sym.packge() != syms.rootPackage
4465 && !symbolPackageVisible(env, sym)) {
4466 return diags.create(dkind, log.currentSource(),
4467 pos, "not.def.access.class.intf.cant.access.reason",
4468 sym, sym.location(), sym.location().packge(),
4469 inaccessiblePackageReason(env, sym.packge()));
4470 } else {
4471 return diags.create(dkind, log.currentSource(),
4472 pos, "not.def.access.class.intf.cant.access",
4473 sym, sym.location());
4474 }
4475 }
4476 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
4477 return diags.create(dkind, log.currentSource(),
4478 pos, "report.access", sym,
4479 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
4480 sym.location());
4481 }
4482 else {
4483 return diags.create(dkind, log.currentSource(),
4484 pos, "not.def.public.cant.access", sym, sym.location());
4485 }
4486 }
4487
4488 private String toString(Type type) {
4489 StringBuilder sb = new StringBuilder();
4490 sb.append(type);
4491 if (type != null) {
4492 sb.append("[tsym:").append(type.tsym);
4493 if (type.tsym != null)
4494 sb.append("packge:").append(type.tsym.packge());
4495 sb.append("]");
4496 }
4497 return sb.toString();
4498 }
4499 }
4500
4501 class InvisibleSymbolError extends InvalidSymbolError {
4502
4503 private final Env<AttrContext> env;
4504 private final boolean suppressError;
4505
4506 InvisibleSymbolError(Env<AttrContext> env, boolean suppressError, Symbol sym) {
4507 super(HIDDEN, sym, "invisible class error");
4508 this.env = env;
4509 this.suppressError = suppressError;
4510 this.name = sym.name;
4511 }
4512
4513 @Override
4514 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4515 DiagnosticPosition pos,
4516 Symbol location,
4517 Type site,
4518 Name name,
4519 List<Type> argtypes,
4520 List<Type> typeargtypes) {
4521 if (suppressError)
4522 return null;
4523
4524 if (sym.kind == PCK) {
4525 JCDiagnostic details = inaccessiblePackageReason(env, sym.packge());
4526 return diags.create(dkind, log.currentSource(),
4527 pos, "package.not.visible", sym, details);
4528 }
4529
4530 JCDiagnostic details = inaccessiblePackageReason(env, sym.packge());
4531
4532 if (pos.getTree() != null) {
4533 Symbol o = sym;
4534 JCTree tree = pos.getTree();
4535
4536 while (o.kind != PCK && tree.hasTag(SELECT)) {
4537 o = o.owner;
4538 tree = ((JCFieldAccess) tree).selected;
4539 }
4540
4541 if (o.kind == PCK) {
4542 pos = tree.pos();
4543
4544 return diags.create(dkind, log.currentSource(),
4545 pos, "package.not.visible", o, details);
4546 }
4547 }
4548
4549 return diags.create(dkind, log.currentSource(),
4550 pos, "not.def.access.package.cant.access", sym, sym.packge(), details);
4551 }
4552 }
4553
4554 JCDiagnostic inaccessiblePackageReason(Env<AttrContext> env, PackageSymbol sym) {
4555 //no dependency:
4556 if (!env.toplevel.modle.readModules.contains(sym.modle)) {
4557 //does not read:
4558 if (sym.modle != syms.unnamedModule) {
4559 if (env.toplevel.modle != syms.unnamedModule) {
4560 return diags.fragment(Fragments.NotDefAccessDoesNotRead(env.toplevel.modle,
4561 sym,
4562 sym.modle));
4563 } else {
4564 return diags.fragment(Fragments.NotDefAccessDoesNotReadFromUnnamed(sym,
4565 sym.modle));
4566 }
4567 } else {
4568 return diags.fragment(Fragments.NotDefAccessDoesNotReadUnnamed(sym,
4569 env.toplevel.modle));
4570 }
4571 } else {
4572 if (sym.packge().modle.exports.stream().anyMatch(e -> e.packge == sym)) {
4573 //not exported to this module:
4574 if (env.toplevel.modle != syms.unnamedModule) {
4575 return diags.fragment(Fragments.NotDefAccessNotExportedToModule(sym,
4576 sym.modle,
4577 env.toplevel.modle));
4578 } else {
4579 return diags.fragment(Fragments.NotDefAccessNotExportedToModuleFromUnnamed(sym,
4580 sym.modle));
4581 }
4582 } else {
4583 //not exported:
4584 if (env.toplevel.modle != syms.unnamedModule) {
4585 return diags.fragment(Fragments.NotDefAccessNotExported(sym,
4586 sym.modle));
4587 } else {
4588 return diags.fragment(Fragments.NotDefAccessNotExportedFromUnnamed(sym,
4589 sym.modle));
4590 }
4591 }
4592 }
4593 }
4594
4595 /**
4596 * InvalidSymbolError error class indicating that an instance member
4597 * has erroneously been accessed from a static context.
4598 */
4599 class StaticError extends InvalidSymbolError {
4600
4601 StaticError(Symbol sym) {
4602 this(sym, "static error");
4603 }
4604
4605 StaticError(Symbol sym, String debugName) {
4606 super(STATICERR, sym, debugName);
4607 }
4608
4609 @Override
4610 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4611 DiagnosticPosition pos,
4612 Symbol location,
4613 Type site,
4614 Name name,
4615 List<Type> argtypes,
4616 List<Type> typeargtypes) {
4617 Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
4618 ? types.erasure(sym.type).tsym
4619 : sym);
4620 return diags.create(dkind, log.currentSource(), pos,
4621 "non-static.cant.be.ref", kindName(sym), errSym);
4622 }
4623 }
4624
4625 /**
4626 * Specialization of {@link InvalidSymbolError} for illegal
4627 * early accesses within a constructor prologue.
4628 */
4629 class RefBeforeCtorCalledError extends StaticError {
4630
4631 RefBeforeCtorCalledError(Symbol sym) {
4632 super(sym, "prologue error");
4633 }
4634
4635 @Override
4636 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4637 DiagnosticPosition pos,
4638 Symbol location,
4639 Type site,
4640 Name name,
4641 List<Type> argtypes,
4642 List<Type> typeargtypes) {
4643 Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
4644 ? types.erasure(sym.type).tsym
4645 : sym);
4646 return diags.create(dkind, log.currentSource(), pos,
4647 "cant.ref.before.ctor.called", errSym);
4648 }
4649 }
4650
4651 /**
4652 * InvalidSymbolError error class indicating that a pair of symbols
4653 * (either methods, constructors or operands) are ambiguous
4654 * given an actual arguments/type argument list.
4655 */
4656 class AmbiguityError extends ResolveError {
4657
4658 /** The other maximally specific symbol */
4659 List<Symbol> ambiguousSyms = List.nil();
4660
4661 @Override
4662 public boolean exists() {
4663 return true;
4664 }
4665
4666 AmbiguityError(Symbol sym1, Symbol sym2) {
4667 super(AMBIGUOUS, "ambiguity error");
4668 ambiguousSyms = flatten(sym2).appendList(flatten(sym1));
4669 }
4670
4671 private List<Symbol> flatten(Symbol sym) {
4672 if (sym.kind == AMBIGUOUS) {
4673 return ((AmbiguityError)sym.baseSymbol()).ambiguousSyms;
4674 } else {
4675 return List.of(sym);
4676 }
4677 }
4678
4679 AmbiguityError addAmbiguousSymbol(Symbol s) {
4680 ambiguousSyms = ambiguousSyms.prepend(s);
4681 return this;
4682 }
4683
4684 @Override
4685 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
4686 DiagnosticPosition pos,
4687 Symbol location,
4688 Type site,
4689 Name name,
4690 List<Type> argtypes,
4691 List<Type> typeargtypes) {
4692 List<Symbol> diagSyms = ambiguousSyms.reverse();
4693 Symbol s1 = diagSyms.head;
4694 Symbol s2 = diagSyms.tail.head;
4695 Name sname = s1.name;
4696 if (sname == names.init) sname = s1.owner.name;
4697 return diags.create(dkind, log.currentSource(),
4698 pos, "ref.ambiguous", sname,
4699 kindName(s1),
4700 s1,
4701 s1.location(site, types),
4702 kindName(s2),
4703 s2,
4704 s2.location(site, types));
4705 }
4706
4707 /**
4708 * If multiple applicable methods are found during overload and none of them
4709 * is more specific than the others, attempt to merge their signatures.
4710 */
4711 Symbol mergeAbstracts(Type site) {
4712 List<Symbol> ambiguousInOrder = ambiguousSyms.reverse();
4713 return types.mergeAbstracts(ambiguousInOrder, site, true).orElse(this);
4714 }
4715
4716 @Override
4717 protected Symbol access(Name name, TypeSymbol location) {
4718 Symbol firstAmbiguity = ambiguousSyms.last();
4719 return firstAmbiguity.kind == TYP ?
4720 types.createErrorType(name, location, firstAmbiguity.type).tsym :
4721 firstAmbiguity;
4722 }
4723 }
4724
4725 class BadVarargsMethod extends ResolveError {
4726
4727 ResolveError delegatedError;
4728
4729 BadVarargsMethod(ResolveError delegatedError) {
4730 super(delegatedError.kind, "badVarargs");
4731 this.delegatedError = delegatedError;
4732 }
4733
4734 @Override
4735 public Symbol baseSymbol() {
4736 return delegatedError.baseSymbol();
4737 }
4738
4739 @Override
4740 protected Symbol access(Name name, TypeSymbol location) {
4741 return delegatedError.access(name, location);
4742 }
4743
4744 @Override
4745 public boolean exists() {
4746 return true;
4747 }
4748
4749 @Override
4750 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4751 return delegatedError.getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes);
4752 }
4753 }
4754
4755 /**
4756 * BadMethodReferenceError error class indicating that a method reference symbol has been found,
4757 * but with the wrong staticness.
4758 */
4759 class BadMethodReferenceError extends StaticError {
4760
4761 boolean unboundLookup;
4762
4763 public BadMethodReferenceError(Symbol sym, boolean unboundLookup) {
4764 super(sym, "bad method ref error");
4765 this.unboundLookup = unboundLookup;
4766 }
4767
4768 @Override
4769 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4770 final String key;
4771 if (!unboundLookup) {
4772 key = "bad.static.method.in.bound.lookup";
4773 } else if (sym.isStatic()) {
4774 key = "bad.static.method.in.unbound.lookup";
4775 } else {
4776 key = "bad.instance.method.in.unbound.lookup";
4777 }
4778 return sym.kind.isResolutionError() ?
4779 ((ResolveError)sym).getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes) :
4780 diags.create(dkind, log.currentSource(), pos, key, Kinds.kindName(sym), sym);
4781 }
4782 }
4783
4784 /**
4785 * BadConstructorReferenceError error class indicating that a constructor reference symbol has been found,
4786 * but pointing to a class for which an enclosing instance is not available.
4787 */
4788 class BadConstructorReferenceError extends InvalidSymbolError {
4789
4790 public BadConstructorReferenceError(Symbol sym) {
4791 super(MISSING_ENCL, sym, "BadConstructorReferenceError");
4792 }
4793
4794 @Override
4795 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4796 return diags.create(dkind, log.currentSource(), pos,
4797 "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
4798 }
4799 }
4800
4801 class BadClassFileError extends InvalidSymbolError {
4802
4803 private final CompletionFailure ex;
4804
4805 public BadClassFileError(CompletionFailure ex) {
4806 super(HIDDEN, ex.sym, "BadClassFileError");
4807 this.name = sym.name;
4808 this.ex = ex;
4809 }
4810
4811 @Override
4812 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
4813 JCDiagnostic d = diags.create(dkind, log.currentSource(), pos,
4814 "cant.access", ex.sym, ex.getDetailValue());
4815
4816 d.setFlag(DiagnosticFlag.NON_DEFERRABLE);
4817 return d;
4818 }
4819
4820 }
4821
4822 /**
4823 * Helper class for method resolution diagnostic simplification.
4824 * Certain resolution diagnostic are rewritten as simpler diagnostic
4825 * where the enclosing resolution diagnostic (i.e. 'inapplicable method')
4826 * is stripped away, as it doesn't carry additional info. The logic
4827 * for matching a given diagnostic is given in terms of a template
4828 * hierarchy: a diagnostic template can be specified programmatically,
4829 * so that only certain diagnostics are matched. Each templete is then
4830 * associated with a rewriter object that carries out the task of rewtiting
4831 * the diagnostic to a simpler one.
4832 */
4833 static class MethodResolutionDiagHelper {
4834
4835 /**
4836 * A diagnostic rewriter transforms a method resolution diagnostic
4837 * into a simpler one
4838 */
4839 interface DiagnosticRewriter {
4840 JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4841 DiagnosticPosition preferredPos, DiagnosticSource preferredSource,
4842 DiagnosticType preferredKind, JCDiagnostic d);
4843 }
4844
4845 /**
4846 * A diagnostic template is made up of two ingredients: (i) a regular
4847 * expression for matching a diagnostic key and (ii) a list of sub-templates
4848 * for matching diagnostic arguments.
4849 */
4850 static class Template {
4851
4852 /** regex used to match diag key */
4853 String regex;
4854
4855 /** templates used to match diagnostic args */
4856 Template[] subTemplates;
4857
4858 Template(String key, Template... subTemplates) {
4859 this.regex = key;
4860 this.subTemplates = subTemplates;
4861 }
4862
4863 /**
4864 * Returns true if the regex matches the diagnostic key and if
4865 * all diagnostic arguments are matches by corresponding sub-templates.
4866 */
4867 boolean matches(Object o) {
4868 JCDiagnostic d = (JCDiagnostic)o;
4869 Object[] args = d.getArgs();
4870 if (!d.getCode().matches(regex) ||
4871 subTemplates.length != d.getArgs().length) {
4872 return false;
4873 }
4874 for (int i = 0; i < args.length ; i++) {
4875 if (!subTemplates[i].matches(args[i])) {
4876 return false;
4877 }
4878 }
4879 return true;
4880 }
4881 }
4882
4883 /**
4884 * Common rewriter for all argument mismatch simplifications.
4885 */
4886 static class ArgMismatchRewriter implements DiagnosticRewriter {
4887
4888 /** the index of the subdiagnostic to be used as primary. */
4889 int causeIndex;
4890
4891 public ArgMismatchRewriter(int causeIndex) {
4892 this.causeIndex = causeIndex;
4893 }
4894
4895 @Override
4896 public JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
4897 DiagnosticPosition preferredPos, DiagnosticSource preferredSource,
4898 DiagnosticType preferredKind, JCDiagnostic d) {
4899 JCDiagnostic cause = (JCDiagnostic)d.getArgs()[causeIndex];
4900 DiagnosticPosition pos = d.getDiagnosticPosition();
4901 if (pos == null) {
4902 pos = preferredPos;
4903 }
4904 return diags.create(preferredKind, preferredSource, pos,
4905 "prob.found.req", cause);
4906 }
4907 }
4908
4909 /** a dummy template that match any diagnostic argument */
4910 static final Template skip = new Template("") {
4911 @Override
4912 boolean matches(Object d) {
4913 return true;
4914 }
4915 };
4916
4917 /** template for matching inference-free arguments mismatch failures */
4918 static final Template argMismatchTemplate = new Template(MethodCheckDiag.ARG_MISMATCH.regex(), skip);
4919
4920 /** template for matching inference related arguments mismatch failures */
4921 static final Template inferArgMismatchTemplate = new Template(MethodCheckDiag.ARG_MISMATCH.regex(), skip, skip) {
4922 @Override
4923 boolean matches(Object o) {
4924 if (!super.matches(o)) {
4925 return false;
4926 }
4927 JCDiagnostic d = (JCDiagnostic)o;
4928 @SuppressWarnings("unchecked")
4929 List<Type> tvars = (List<Type>)d.getArgs()[0];
4930 return !containsAny(d, tvars);
4931 }
4932
4933 BiPredicate<Object, List<Type>> containsPredicate = (o, ts) -> {
4934 if (o instanceof Type type) {
4935 return type.containsAny(ts);
4936 } else if (o instanceof JCDiagnostic diagnostic) {
4937 return containsAny(diagnostic, ts);
4938 } else {
4939 return false;
4940 }
4941 };
4942
4943 boolean containsAny(JCDiagnostic d, List<Type> ts) {
4944 return Stream.of(d.getArgs())
4945 .anyMatch(o -> containsPredicate.test(o, ts));
4946 }
4947 };
4948
4949 /** rewriter map used for method resolution simplification */
4950 static final Map<Template, DiagnosticRewriter> rewriters = new LinkedHashMap<>();
4951
4952 static {
4953 rewriters.put(argMismatchTemplate, new ArgMismatchRewriter(0));
4954 rewriters.put(inferArgMismatchTemplate, new ArgMismatchRewriter(1));
4955 }
4956
4957 /**
4958 * Main entry point for diagnostic rewriting - given a diagnostic, see if any templates matches it,
4959 * and rewrite it accordingly.
4960 */
4961 static JCDiagnostic rewrite(JCDiagnostic.Factory diags, DiagnosticPosition pos, DiagnosticSource source,
4962 DiagnosticType dkind, JCDiagnostic d) {
4963 for (Map.Entry<Template, DiagnosticRewriter> _entry : rewriters.entrySet()) {
4964 if (_entry.getKey().matches(d)) {
4965 JCDiagnostic simpleDiag =
4966 _entry.getValue().rewriteDiagnostic(diags, pos, source, dkind, d);
4967 simpleDiag.setFlag(DiagnosticFlag.COMPRESSED);
4968 return simpleDiag;
4969 }
4970 }
4971 return null;
4972 }
4973 }
4974
4975 enum MethodResolutionPhase {
4976 BASIC(false, false),
4977 BOX(true, false),
4978 VARARITY(true, true) {
4979 @Override
4980 public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
4981 //Check invariants (see {@code LookupHelper.shouldStop})
4982 Assert.check(bestSoFar.kind.isResolutionError() && bestSoFar.kind != AMBIGUOUS);
4983 if (!sym.kind.isResolutionError()) {
4984 //varargs resolution successful
4985 return sym;
4986 } else {
4987 //pick best error
4988 switch (bestSoFar.kind) {
4989 case WRONG_MTH:
4990 case WRONG_MTHS:
4991 //Override previous errors if they were caused by argument mismatch.
4992 //This generally means preferring current symbols - but we need to pay
4993 //attention to the fact that the varargs lookup returns 'less' candidates
4994 //than the previous rounds, and adjust that accordingly.
4995 switch (sym.kind) {
4996 case WRONG_MTH:
4997 //if the previous round matched more than one method, return that
4998 //result instead
4999 return bestSoFar.kind == WRONG_MTHS ?
5000 bestSoFar : sym;
5001 case ABSENT_MTH:
5002 //do not override erroneous symbol if the arity lookup did not
5003 //match any method
5004 return bestSoFar;
5005 case WRONG_MTHS:
5006 default:
5007 //safe to override
5008 return sym;
5009 }
5010 default:
5011 //otherwise, return first error
5012 return bestSoFar;
5013 }
5014 }
5015 }
5016 };
5017
5018 final boolean isBoxingRequired;
5019 final boolean isVarargsRequired;
5020
5021 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
5022 this.isBoxingRequired = isBoxingRequired;
5023 this.isVarargsRequired = isVarargsRequired;
5024 }
5025
5026 public boolean isBoxingRequired() {
5027 return isBoxingRequired;
5028 }
5029
5030 public boolean isVarargsRequired() {
5031 return isVarargsRequired;
5032 }
5033
5034 public Symbol mergeResults(Symbol prev, Symbol sym) {
5035 return sym;
5036 }
5037 }
5038
5039 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
5040
5041 /**
5042 * A resolution context is used to keep track of intermediate results of
5043 * overload resolution, such as list of method that are not applicable
5044 * (used to generate more precise diagnostics) and so on. Resolution contexts
5045 * can be nested - this means that when each overload resolution routine should
5046 * work within the resolution context it created.
5047 */
5048 class MethodResolutionContext {
5049
5050 private List<Candidate> candidates = List.nil();
5051
5052 MethodResolutionPhase step = null;
5053
5054 MethodCheck methodCheck = resolveMethodCheck;
5055
5056 private boolean internalResolution = false;
5057 private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
5058
5059 void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
5060 Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
5061 candidates = candidates.append(c);
5062 }
5063
5064 void addApplicableCandidate(Symbol sym, Type mtype) {
5065 Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
5066 candidates = candidates.append(c);
5067 }
5068
5069 DeferredAttrContext deferredAttrContext(Symbol sym, InferenceContext inferenceContext, ResultInfo pendingResult, Warner warn) {
5070 DeferredAttrContext parent = (pendingResult == null)
5071 ? deferredAttr.emptyDeferredAttrContext
5072 : pendingResult.checkContext.deferredAttrContext();
5073 return deferredAttr.new DeferredAttrContext(attrMode, sym, step,
5074 inferenceContext, parent, warn);
5075 }
5076
5077 /**
5078 * This class represents an overload resolution candidate. There are two
5079 * kinds of candidates: applicable methods and inapplicable methods;
5080 * applicable methods have a pointer to the instantiated method type,
5081 * while inapplicable candidates contain further details about the
5082 * reason why the method has been considered inapplicable.
5083 */
5084 @SuppressWarnings("overrides")
5085 class Candidate {
5086
5087 final MethodResolutionPhase step;
5088 final Symbol sym;
5089 final JCDiagnostic details;
5090 final Type mtype;
5091
5092 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
5093 this.step = step;
5094 this.sym = sym;
5095 this.details = details;
5096 this.mtype = mtype;
5097 }
5098
5099 boolean isApplicable() {
5100 return mtype != null;
5101 }
5102 }
5103
5104 DeferredAttr.AttrMode attrMode() {
5105 return attrMode;
5106 }
5107
5108 boolean internal() {
5109 return internalResolution;
5110 }
5111 }
5112
5113 MethodResolutionContext currentResolutionContext = null;
5114 }