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src/share/classes/com/sun/tools/javac/comp/Resolve.java@9b85813d2262
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Tue, 06 Nov 2012 14:45:27 +0000
- author
- mcimadamore
- date
- Tue, 06 Nov 2012 14:45:27 +0000
- changeset 1396
- 9b85813d2262
- parent 1394
- dbc94b8363dd
- child 1409
- 33abf479f202
- permissions
- -rw-r--r--
8002286: Regression: Fix for 8000931 causes a JCK test failure
Summary: Wrong type used as 'site' in Resolve.resolveMethod
Reviewed-by: jjg
1 /*
2 * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.comp;
28 import com.sun.tools.javac.api.Formattable.LocalizedString;
29 import com.sun.tools.javac.code.*;
30 import com.sun.tools.javac.code.Symbol.*;
31 import com.sun.tools.javac.code.Type.*;
32 import com.sun.tools.javac.comp.Attr.ResultInfo;
33 import com.sun.tools.javac.comp.Check.CheckContext;
34 import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
35 import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
36 import com.sun.tools.javac.comp.DeferredAttr.DeferredType;
37 import com.sun.tools.javac.comp.Infer.InferenceContext;
38 import com.sun.tools.javac.comp.Infer.InferenceContext.FreeTypeListener;
39 import com.sun.tools.javac.comp.Resolve.MethodResolutionContext.Candidate;
40 import com.sun.tools.javac.jvm.*;
41 import com.sun.tools.javac.tree.*;
42 import com.sun.tools.javac.tree.JCTree.*;
43 import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
44 import com.sun.tools.javac.util.*;
45 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
46 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
47 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
49 import java.util.Arrays;
50 import java.util.Collection;
51 import java.util.EnumMap;
52 import java.util.EnumSet;
53 import java.util.Iterator;
54 import java.util.LinkedHashMap;
55 import java.util.LinkedHashSet;
56 import java.util.Map;
57 import java.util.Set;
59 import javax.lang.model.element.ElementVisitor;
61 import static com.sun.tools.javac.code.Flags.*;
62 import static com.sun.tools.javac.code.Flags.BLOCK;
63 import static com.sun.tools.javac.code.Kinds.*;
64 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
65 import static com.sun.tools.javac.code.TypeTag.*;
66 import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
67 import static com.sun.tools.javac.tree.JCTree.Tag.*;
69 /** Helper class for name resolution, used mostly by the attribution phase.
70 *
71 * <p><b>This is NOT part of any supported API.
72 * If you write code that depends on this, you do so at your own risk.
73 * This code and its internal interfaces are subject to change or
74 * deletion without notice.</b>
75 */
76 public class Resolve {
77 protected static final Context.Key<Resolve> resolveKey =
78 new Context.Key<Resolve>();
80 Names names;
81 Log log;
82 Symtab syms;
83 Attr attr;
84 DeferredAttr deferredAttr;
85 Check chk;
86 Infer infer;
87 ClassReader reader;
88 TreeInfo treeinfo;
89 Types types;
90 JCDiagnostic.Factory diags;
91 public final boolean boxingEnabled; // = source.allowBoxing();
92 public final boolean varargsEnabled; // = source.allowVarargs();
93 public final boolean allowMethodHandles;
94 public final boolean allowDefaultMethods;
95 private final boolean debugResolve;
96 final EnumSet<VerboseResolutionMode> verboseResolutionMode;
98 Scope polymorphicSignatureScope;
100 protected Resolve(Context context) {
101 context.put(resolveKey, this);
102 syms = Symtab.instance(context);
104 varNotFound = new
105 SymbolNotFoundError(ABSENT_VAR);
106 methodNotFound = new
107 SymbolNotFoundError(ABSENT_MTH);
108 typeNotFound = new
109 SymbolNotFoundError(ABSENT_TYP);
111 names = Names.instance(context);
112 log = Log.instance(context);
113 attr = Attr.instance(context);
114 deferredAttr = DeferredAttr.instance(context);
115 chk = Check.instance(context);
116 infer = Infer.instance(context);
117 reader = ClassReader.instance(context);
118 treeinfo = TreeInfo.instance(context);
119 types = Types.instance(context);
120 diags = JCDiagnostic.Factory.instance(context);
121 Source source = Source.instance(context);
122 boxingEnabled = source.allowBoxing();
123 varargsEnabled = source.allowVarargs();
124 Options options = Options.instance(context);
125 debugResolve = options.isSet("debugresolve");
126 verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
127 Target target = Target.instance(context);
128 allowMethodHandles = target.hasMethodHandles();
129 allowDefaultMethods = source.allowDefaultMethods();
130 polymorphicSignatureScope = new Scope(syms.noSymbol);
132 inapplicableMethodException = new InapplicableMethodException(diags);
133 }
135 /** error symbols, which are returned when resolution fails
136 */
137 private final SymbolNotFoundError varNotFound;
138 private final SymbolNotFoundError methodNotFound;
139 private final SymbolNotFoundError typeNotFound;
141 public static Resolve instance(Context context) {
142 Resolve instance = context.get(resolveKey);
143 if (instance == null)
144 instance = new Resolve(context);
145 return instance;
146 }
148 // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
149 enum VerboseResolutionMode {
150 SUCCESS("success"),
151 FAILURE("failure"),
152 APPLICABLE("applicable"),
153 INAPPLICABLE("inapplicable"),
154 DEFERRED_INST("deferred-inference"),
155 PREDEF("predef"),
156 OBJECT_INIT("object-init"),
157 INTERNAL("internal");
159 String opt;
161 private VerboseResolutionMode(String opt) {
162 this.opt = opt;
163 }
165 static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
166 String s = opts.get("verboseResolution");
167 EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
168 if (s == null) return res;
169 if (s.contains("all")) {
170 res = EnumSet.allOf(VerboseResolutionMode.class);
171 }
172 Collection<String> args = Arrays.asList(s.split(","));
173 for (VerboseResolutionMode mode : values()) {
174 if (args.contains(mode.opt)) {
175 res.add(mode);
176 } else if (args.contains("-" + mode.opt)) {
177 res.remove(mode);
178 }
179 }
180 return res;
181 }
182 }
184 void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
185 List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
186 boolean success = bestSoFar.kind < ERRONEOUS;
188 if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
189 return;
190 } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
191 return;
192 }
194 if (bestSoFar.name == names.init &&
195 bestSoFar.owner == syms.objectType.tsym &&
196 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
197 return; //skip diags for Object constructor resolution
198 } else if (site == syms.predefClass.type &&
199 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
200 return; //skip spurious diags for predef symbols (i.e. operators)
201 } else if (currentResolutionContext.internalResolution &&
202 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
203 return;
204 }
206 int pos = 0;
207 int mostSpecificPos = -1;
208 ListBuffer<JCDiagnostic> subDiags = ListBuffer.lb();
209 for (Candidate c : currentResolutionContext.candidates) {
210 if (currentResolutionContext.step != c.step ||
211 (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
212 (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
213 continue;
214 } else {
215 subDiags.append(c.isApplicable() ?
216 getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
217 getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
218 if (c.sym == bestSoFar)
219 mostSpecificPos = pos;
220 pos++;
221 }
222 }
223 String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
224 List<Type> argtypes2 = Type.map(argtypes,
225 deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
226 JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
227 site.tsym, mostSpecificPos, currentResolutionContext.step,
228 methodArguments(argtypes2),
229 methodArguments(typeargtypes));
230 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
231 log.report(d);
232 }
234 JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
235 JCDiagnostic subDiag = null;
236 if (sym.type.hasTag(FORALL)) {
237 subDiag = diags.fragment("partial.inst.sig", inst);
238 }
240 String key = subDiag == null ?
241 "applicable.method.found" :
242 "applicable.method.found.1";
244 return diags.fragment(key, pos, sym, subDiag);
245 }
247 JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
248 return diags.fragment("not.applicable.method.found", pos, sym, subDiag);
249 }
250 // </editor-fold>
252 /* ************************************************************************
253 * Identifier resolution
254 *************************************************************************/
256 /** An environment is "static" if its static level is greater than
257 * the one of its outer environment
258 */
259 protected static boolean isStatic(Env<AttrContext> env) {
260 return env.info.staticLevel > env.outer.info.staticLevel;
261 }
263 /** An environment is an "initializer" if it is a constructor or
264 * an instance initializer.
265 */
266 static boolean isInitializer(Env<AttrContext> env) {
267 Symbol owner = env.info.scope.owner;
268 return owner.isConstructor() ||
269 owner.owner.kind == TYP &&
270 (owner.kind == VAR ||
271 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
272 (owner.flags() & STATIC) == 0;
273 }
275 /** Is class accessible in given evironment?
276 * @param env The current environment.
277 * @param c The class whose accessibility is checked.
278 */
279 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
280 return isAccessible(env, c, false);
281 }
283 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
284 boolean isAccessible = false;
285 switch ((short)(c.flags() & AccessFlags)) {
286 case PRIVATE:
287 isAccessible =
288 env.enclClass.sym.outermostClass() ==
289 c.owner.outermostClass();
290 break;
291 case 0:
292 isAccessible =
293 env.toplevel.packge == c.owner // fast special case
294 ||
295 env.toplevel.packge == c.packge()
296 ||
297 // Hack: this case is added since synthesized default constructors
298 // of anonymous classes should be allowed to access
299 // classes which would be inaccessible otherwise.
300 env.enclMethod != null &&
301 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
302 break;
303 default: // error recovery
304 case PUBLIC:
305 isAccessible = true;
306 break;
307 case PROTECTED:
308 isAccessible =
309 env.toplevel.packge == c.owner // fast special case
310 ||
311 env.toplevel.packge == c.packge()
312 ||
313 isInnerSubClass(env.enclClass.sym, c.owner);
314 break;
315 }
316 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
317 isAccessible :
318 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
319 }
320 //where
321 /** Is given class a subclass of given base class, or an inner class
322 * of a subclass?
323 * Return null if no such class exists.
324 * @param c The class which is the subclass or is contained in it.
325 * @param base The base class
326 */
327 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
328 while (c != null && !c.isSubClass(base, types)) {
329 c = c.owner.enclClass();
330 }
331 return c != null;
332 }
334 boolean isAccessible(Env<AttrContext> env, Type t) {
335 return isAccessible(env, t, false);
336 }
338 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
339 return (t.hasTag(ARRAY))
340 ? isAccessible(env, types.elemtype(t))
341 : isAccessible(env, t.tsym, checkInner);
342 }
344 /** Is symbol accessible as a member of given type in given evironment?
345 * @param env The current environment.
346 * @param site The type of which the tested symbol is regarded
347 * as a member.
348 * @param sym The symbol.
349 */
350 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
351 return isAccessible(env, site, sym, false);
352 }
353 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
354 if (sym.name == names.init && sym.owner != site.tsym) return false;
355 switch ((short)(sym.flags() & AccessFlags)) {
356 case PRIVATE:
357 return
358 (env.enclClass.sym == sym.owner // fast special case
359 ||
360 env.enclClass.sym.outermostClass() ==
361 sym.owner.outermostClass())
362 &&
363 sym.isInheritedIn(site.tsym, types);
364 case 0:
365 return
366 (env.toplevel.packge == sym.owner.owner // fast special case
367 ||
368 env.toplevel.packge == sym.packge())
369 &&
370 isAccessible(env, site, checkInner)
371 &&
372 sym.isInheritedIn(site.tsym, types)
373 &&
374 notOverriddenIn(site, sym);
375 case PROTECTED:
376 return
377 (env.toplevel.packge == sym.owner.owner // fast special case
378 ||
379 env.toplevel.packge == sym.packge()
380 ||
381 isProtectedAccessible(sym, env.enclClass.sym, site)
382 ||
383 // OK to select instance method or field from 'super' or type name
384 // (but type names should be disallowed elsewhere!)
385 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
386 &&
387 isAccessible(env, site, checkInner)
388 &&
389 notOverriddenIn(site, sym);
390 default: // this case includes erroneous combinations as well
391 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
392 }
393 }
394 //where
395 /* `sym' is accessible only if not overridden by
396 * another symbol which is a member of `site'
397 * (because, if it is overridden, `sym' is not strictly
398 * speaking a member of `site'). A polymorphic signature method
399 * cannot be overridden (e.g. MH.invokeExact(Object[])).
400 */
401 private boolean notOverriddenIn(Type site, Symbol sym) {
402 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
403 return true;
404 else {
405 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
406 return (s2 == null || s2 == sym || sym.owner == s2.owner ||
407 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
408 }
409 }
410 //where
411 /** Is given protected symbol accessible if it is selected from given site
412 * and the selection takes place in given class?
413 * @param sym The symbol with protected access
414 * @param c The class where the access takes place
415 * @site The type of the qualifier
416 */
417 private
418 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
419 while (c != null &&
420 !(c.isSubClass(sym.owner, types) &&
421 (c.flags() & INTERFACE) == 0 &&
422 // In JLS 2e 6.6.2.1, the subclass restriction applies
423 // only to instance fields and methods -- types are excluded
424 // regardless of whether they are declared 'static' or not.
425 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
426 c = c.owner.enclClass();
427 return c != null;
428 }
430 /** Try to instantiate the type of a method so that it fits
431 * given type arguments and argument types. If succesful, return
432 * the method's instantiated type, else return null.
433 * The instantiation will take into account an additional leading
434 * formal parameter if the method is an instance method seen as a member
435 * of un underdetermined site In this case, we treat site as an additional
436 * parameter and the parameters of the class containing the method as
437 * additional type variables that get instantiated.
438 *
439 * @param env The current environment
440 * @param site The type of which the method is a member.
441 * @param m The method symbol.
442 * @param argtypes The invocation's given value arguments.
443 * @param typeargtypes The invocation's given type arguments.
444 * @param allowBoxing Allow boxing conversions of arguments.
445 * @param useVarargs Box trailing arguments into an array for varargs.
446 */
447 Type rawInstantiate(Env<AttrContext> env,
448 Type site,
449 Symbol m,
450 ResultInfo resultInfo,
451 List<Type> argtypes,
452 List<Type> typeargtypes,
453 boolean allowBoxing,
454 boolean useVarargs,
455 Warner warn) throws Infer.InferenceException {
457 Type mt = types.memberType(site, m);
458 // tvars is the list of formal type variables for which type arguments
459 // need to inferred.
460 List<Type> tvars = List.nil();
461 if (typeargtypes == null) typeargtypes = List.nil();
462 if (!mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
463 // This is not a polymorphic method, but typeargs are supplied
464 // which is fine, see JLS 15.12.2.1
465 } else if (mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
466 ForAll pmt = (ForAll) mt;
467 if (typeargtypes.length() != pmt.tvars.length())
468 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
469 // Check type arguments are within bounds
470 List<Type> formals = pmt.tvars;
471 List<Type> actuals = typeargtypes;
472 while (formals.nonEmpty() && actuals.nonEmpty()) {
473 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
474 pmt.tvars, typeargtypes);
475 for (; bounds.nonEmpty(); bounds = bounds.tail)
476 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
477 throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
478 formals = formals.tail;
479 actuals = actuals.tail;
480 }
481 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
482 } else if (mt.hasTag(FORALL)) {
483 ForAll pmt = (ForAll) mt;
484 List<Type> tvars1 = types.newInstances(pmt.tvars);
485 tvars = tvars.appendList(tvars1);
486 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
487 }
489 // find out whether we need to go the slow route via infer
490 boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
491 for (List<Type> l = argtypes;
492 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
493 l = l.tail) {
494 if (l.head.hasTag(FORALL)) instNeeded = true;
495 }
497 if (instNeeded)
498 return infer.instantiateMethod(env,
499 tvars,
500 (MethodType)mt,
501 resultInfo,
502 m,
503 argtypes,
504 allowBoxing,
505 useVarargs,
506 currentResolutionContext,
507 warn);
509 checkRawArgumentsAcceptable(env, m, argtypes, mt.getParameterTypes(),
510 allowBoxing, useVarargs, warn);
511 return mt;
512 }
514 Type checkMethod(Env<AttrContext> env,
515 Type site,
516 Symbol m,
517 ResultInfo resultInfo,
518 List<Type> argtypes,
519 List<Type> typeargtypes,
520 Warner warn) {
521 MethodResolutionContext prevContext = currentResolutionContext;
522 try {
523 currentResolutionContext = new MethodResolutionContext();
524 currentResolutionContext.attrMode = DeferredAttr.AttrMode.CHECK;
525 MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
526 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
527 step.isBoxingRequired(), step.isVarargsRequired(), warn);
528 }
529 finally {
530 currentResolutionContext = prevContext;
531 }
532 }
534 /** Same but returns null instead throwing a NoInstanceException
535 */
536 Type instantiate(Env<AttrContext> env,
537 Type site,
538 Symbol m,
539 ResultInfo resultInfo,
540 List<Type> argtypes,
541 List<Type> typeargtypes,
542 boolean allowBoxing,
543 boolean useVarargs,
544 Warner warn) {
545 try {
546 return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
547 allowBoxing, useVarargs, warn);
548 } catch (InapplicableMethodException ex) {
549 return null;
550 }
551 }
553 /** Check if a parameter list accepts a list of args.
554 */
555 boolean argumentsAcceptable(Env<AttrContext> env,
556 Symbol msym,
557 List<Type> argtypes,
558 List<Type> formals,
559 boolean allowBoxing,
560 boolean useVarargs,
561 Warner warn) {
562 try {
563 checkRawArgumentsAcceptable(env, msym, argtypes, formals, allowBoxing, useVarargs, warn);
564 return true;
565 } catch (InapplicableMethodException ex) {
566 return false;
567 }
568 }
569 /**
570 * A check handler is used by the main method applicability routine in order
571 * to handle specific method applicability failures. It is assumed that a class
572 * implementing this interface should throw exceptions that are a subtype of
573 * InapplicableMethodException (see below). Such exception will terminate the
574 * method applicability check and propagate important info outwards (for the
575 * purpose of generating better diagnostics).
576 */
577 interface MethodCheckHandler {
578 /* The number of actuals and formals differ */
579 InapplicableMethodException arityMismatch();
580 /* An actual argument type does not conform to the corresponding formal type */
581 InapplicableMethodException argumentMismatch(boolean varargs, JCDiagnostic details);
582 /* The element type of a varargs is not accessible in the current context */
583 InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected);
584 }
586 /**
587 * Basic method check handler used within Resolve - all methods end up
588 * throwing InapplicableMethodException; a diagnostic fragment that describes
589 * the cause as to why the method is not applicable is set on the exception
590 * before it is thrown.
591 */
592 MethodCheckHandler resolveHandler = new MethodCheckHandler() {
593 public InapplicableMethodException arityMismatch() {
594 return inapplicableMethodException.setMessage("arg.length.mismatch");
595 }
596 public InapplicableMethodException argumentMismatch(boolean varargs, JCDiagnostic details) {
597 String key = varargs ?
598 "varargs.argument.mismatch" :
599 "no.conforming.assignment.exists";
600 return inapplicableMethodException.setMessage(key,
601 details);
602 }
603 public InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected) {
604 return inapplicableMethodException.setMessage("inaccessible.varargs.type",
605 expected, Kinds.kindName(location), location);
606 }
607 };
609 void checkRawArgumentsAcceptable(Env<AttrContext> env,
610 Symbol msym,
611 List<Type> argtypes,
612 List<Type> formals,
613 boolean allowBoxing,
614 boolean useVarargs,
615 Warner warn) {
616 checkRawArgumentsAcceptable(env, msym, currentResolutionContext.attrMode(), infer.emptyContext, argtypes, formals,
617 allowBoxing, useVarargs, warn, resolveHandler);
618 }
620 /**
621 * Main method applicability routine. Given a list of actual types A,
622 * a list of formal types F, determines whether the types in A are
623 * compatible (by method invocation conversion) with the types in F.
624 *
625 * Since this routine is shared between overload resolution and method
626 * type-inference, a (possibly empty) inference context is used to convert
627 * formal types to the corresponding 'undet' form ahead of a compatibility
628 * check so that constraints can be propagated and collected.
629 *
630 * Moreover, if one or more types in A is a deferred type, this routine uses
631 * DeferredAttr in order to perform deferred attribution. If one or more actual
632 * deferred types are stuck, they are placed in a queue and revisited later
633 * after the remainder of the arguments have been seen. If this is not sufficient
634 * to 'unstuck' the argument, a cyclic inference error is called out.
635 *
636 * A method check handler (see above) is used in order to report errors.
637 */
638 void checkRawArgumentsAcceptable(final Env<AttrContext> env,
639 Symbol msym,
640 DeferredAttr.AttrMode mode,
641 final Infer.InferenceContext inferenceContext,
642 List<Type> argtypes,
643 List<Type> formals,
644 boolean allowBoxing,
645 boolean useVarargs,
646 Warner warn,
647 final MethodCheckHandler handler) {
648 Type varargsFormal = useVarargs ? formals.last() : null;
650 if (varargsFormal == null &&
651 argtypes.size() != formals.size()) {
652 throw handler.arityMismatch(); // not enough args
653 }
655 DeferredAttr.DeferredAttrContext deferredAttrContext =
656 deferredAttr.new DeferredAttrContext(mode, msym, currentResolutionContext.step, inferenceContext);
658 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
659 ResultInfo mresult = methodCheckResult(formals.head, allowBoxing, false, inferenceContext, deferredAttrContext, handler, warn);
660 mresult.check(null, argtypes.head);
661 argtypes = argtypes.tail;
662 formals = formals.tail;
663 }
665 if (formals.head != varargsFormal) {
666 throw handler.arityMismatch(); // not enough args
667 }
669 if (useVarargs) {
670 //note: if applicability check is triggered by most specific test,
671 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
672 final Type elt = types.elemtype(varargsFormal);
673 ResultInfo mresult = methodCheckResult(elt, allowBoxing, true, inferenceContext, deferredAttrContext, handler, warn);
674 while (argtypes.nonEmpty()) {
675 mresult.check(null, argtypes.head);
676 argtypes = argtypes.tail;
677 }
678 //check varargs element type accessibility
679 varargsAccessible(env, elt, handler, inferenceContext);
680 }
682 deferredAttrContext.complete();
683 }
685 void varargsAccessible(final Env<AttrContext> env, final Type t, final Resolve.MethodCheckHandler handler, final InferenceContext inferenceContext) {
686 if (inferenceContext.free(t)) {
687 inferenceContext.addFreeTypeListener(List.of(t), new FreeTypeListener() {
688 @Override
689 public void typesInferred(InferenceContext inferenceContext) {
690 varargsAccessible(env, inferenceContext.asInstType(t, types), handler, inferenceContext);
691 }
692 });
693 } else {
694 if (!isAccessible(env, t)) {
695 Symbol location = env.enclClass.sym;
696 throw handler.inaccessibleVarargs(location, t);
697 }
698 }
699 }
701 /**
702 * Check context to be used during method applicability checks. A method check
703 * context might contain inference variables.
704 */
705 abstract class MethodCheckContext implements CheckContext {
707 MethodCheckHandler handler;
708 boolean useVarargs;
709 Infer.InferenceContext inferenceContext;
710 DeferredAttrContext deferredAttrContext;
711 Warner rsWarner;
713 public MethodCheckContext(MethodCheckHandler handler, boolean useVarargs,
714 Infer.InferenceContext inferenceContext, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
715 this.handler = handler;
716 this.useVarargs = useVarargs;
717 this.inferenceContext = inferenceContext;
718 this.deferredAttrContext = deferredAttrContext;
719 this.rsWarner = rsWarner;
720 }
722 public void report(DiagnosticPosition pos, JCDiagnostic details) {
723 throw handler.argumentMismatch(useVarargs, details);
724 }
726 public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
727 return rsWarner;
728 }
730 public InferenceContext inferenceContext() {
731 return inferenceContext;
732 }
734 public DeferredAttrContext deferredAttrContext() {
735 return deferredAttrContext;
736 }
737 }
739 /**
740 * Subclass of method check context class that implements strict method conversion.
741 * Strict method conversion checks compatibility between types using subtyping tests.
742 */
743 class StrictMethodContext extends MethodCheckContext {
745 public StrictMethodContext(MethodCheckHandler handler, boolean useVarargs,
746 Infer.InferenceContext inferenceContext, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
747 super(handler, useVarargs, inferenceContext, deferredAttrContext, rsWarner);
748 }
750 public boolean compatible(Type found, Type req, Warner warn) {
751 return types.isSubtypeUnchecked(found, inferenceContext.asFree(req, types), warn);
752 }
754 public boolean allowBoxing() {
755 return false;
756 }
757 }
759 /**
760 * Subclass of method check context class that implements loose method conversion.
761 * Loose method conversion checks compatibility between types using method conversion tests.
762 */
763 class LooseMethodContext extends MethodCheckContext {
765 public LooseMethodContext(MethodCheckHandler handler, boolean useVarargs,
766 Infer.InferenceContext inferenceContext, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
767 super(handler, useVarargs, inferenceContext, deferredAttrContext, rsWarner);
768 }
770 public boolean compatible(Type found, Type req, Warner warn) {
771 return types.isConvertible(found, inferenceContext.asFree(req, types), warn);
772 }
774 public boolean allowBoxing() {
775 return true;
776 }
777 }
779 /**
780 * Create a method check context to be used during method applicability check
781 */
782 ResultInfo methodCheckResult(Type to, boolean allowBoxing, boolean useVarargs,
783 Infer.InferenceContext inferenceContext, DeferredAttr.DeferredAttrContext deferredAttrContext,
784 MethodCheckHandler methodHandler, Warner rsWarner) {
785 MethodCheckContext checkContext = allowBoxing ?
786 new LooseMethodContext(methodHandler, useVarargs, inferenceContext, deferredAttrContext, rsWarner) :
787 new StrictMethodContext(methodHandler, useVarargs, inferenceContext, deferredAttrContext, rsWarner);
788 return new MethodResultInfo(to, checkContext, deferredAttrContext);
789 }
791 class MethodResultInfo extends ResultInfo {
793 DeferredAttr.DeferredAttrContext deferredAttrContext;
795 public MethodResultInfo(Type pt, MethodCheckContext checkContext, DeferredAttr.DeferredAttrContext deferredAttrContext) {
796 attr.super(VAL, pt, checkContext);
797 this.deferredAttrContext = deferredAttrContext;
798 }
800 @Override
801 protected Type check(DiagnosticPosition pos, Type found) {
802 if (found.hasTag(DEFERRED)) {
803 DeferredType dt = (DeferredType)found;
804 return dt.check(this);
805 } else {
806 return super.check(pos, chk.checkNonVoid(pos, types.capture(types.upperBound(found.baseType()))));
807 }
808 }
810 @Override
811 protected MethodResultInfo dup(Type newPt) {
812 return new MethodResultInfo(newPt, (MethodCheckContext)checkContext, deferredAttrContext);
813 }
814 }
816 public static class InapplicableMethodException extends RuntimeException {
817 private static final long serialVersionUID = 0;
819 JCDiagnostic diagnostic;
820 JCDiagnostic.Factory diags;
822 InapplicableMethodException(JCDiagnostic.Factory diags) {
823 this.diagnostic = null;
824 this.diags = diags;
825 }
826 InapplicableMethodException setMessage() {
827 return setMessage((JCDiagnostic)null);
828 }
829 InapplicableMethodException setMessage(String key) {
830 return setMessage(key != null ? diags.fragment(key) : null);
831 }
832 InapplicableMethodException setMessage(String key, Object... args) {
833 return setMessage(key != null ? diags.fragment(key, args) : null);
834 }
835 InapplicableMethodException setMessage(JCDiagnostic diag) {
836 this.diagnostic = diag;
837 return this;
838 }
840 public JCDiagnostic getDiagnostic() {
841 return diagnostic;
842 }
843 }
844 private final InapplicableMethodException inapplicableMethodException;
846 /* ***************************************************************************
847 * Symbol lookup
848 * the following naming conventions for arguments are used
849 *
850 * env is the environment where the symbol was mentioned
851 * site is the type of which the symbol is a member
852 * name is the symbol's name
853 * if no arguments are given
854 * argtypes are the value arguments, if we search for a method
855 *
856 * If no symbol was found, a ResolveError detailing the problem is returned.
857 ****************************************************************************/
859 /** Find field. Synthetic fields are always skipped.
860 * @param env The current environment.
861 * @param site The original type from where the selection takes place.
862 * @param name The name of the field.
863 * @param c The class to search for the field. This is always
864 * a superclass or implemented interface of site's class.
865 */
866 Symbol findField(Env<AttrContext> env,
867 Type site,
868 Name name,
869 TypeSymbol c) {
870 while (c.type.hasTag(TYPEVAR))
871 c = c.type.getUpperBound().tsym;
872 Symbol bestSoFar = varNotFound;
873 Symbol sym;
874 Scope.Entry e = c.members().lookup(name);
875 while (e.scope != null) {
876 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
877 return isAccessible(env, site, e.sym)
878 ? e.sym : new AccessError(env, site, e.sym);
879 }
880 e = e.next();
881 }
882 Type st = types.supertype(c.type);
883 if (st != null && (st.hasTag(CLASS) || st.hasTag(TYPEVAR))) {
884 sym = findField(env, site, name, st.tsym);
885 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
886 }
887 for (List<Type> l = types.interfaces(c.type);
888 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
889 l = l.tail) {
890 sym = findField(env, site, name, l.head.tsym);
891 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
892 sym.owner != bestSoFar.owner)
893 bestSoFar = new AmbiguityError(bestSoFar, sym);
894 else if (sym.kind < bestSoFar.kind)
895 bestSoFar = sym;
896 }
897 return bestSoFar;
898 }
900 /** Resolve a field identifier, throw a fatal error if not found.
901 * @param pos The position to use for error reporting.
902 * @param env The environment current at the method invocation.
903 * @param site The type of the qualifying expression, in which
904 * identifier is searched.
905 * @param name The identifier's name.
906 */
907 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
908 Type site, Name name) {
909 Symbol sym = findField(env, site, name, site.tsym);
910 if (sym.kind == VAR) return (VarSymbol)sym;
911 else throw new FatalError(
912 diags.fragment("fatal.err.cant.locate.field",
913 name));
914 }
916 /** Find unqualified variable or field with given name.
917 * Synthetic fields always skipped.
918 * @param env The current environment.
919 * @param name The name of the variable or field.
920 */
921 Symbol findVar(Env<AttrContext> env, Name name) {
922 Symbol bestSoFar = varNotFound;
923 Symbol sym;
924 Env<AttrContext> env1 = env;
925 boolean staticOnly = false;
926 while (env1.outer != null) {
927 if (isStatic(env1)) staticOnly = true;
928 Scope.Entry e = env1.info.scope.lookup(name);
929 while (e.scope != null &&
930 (e.sym.kind != VAR ||
931 (e.sym.flags_field & SYNTHETIC) != 0))
932 e = e.next();
933 sym = (e.scope != null)
934 ? e.sym
935 : findField(
936 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
937 if (sym.exists()) {
938 if (staticOnly &&
939 sym.kind == VAR &&
940 sym.owner.kind == TYP &&
941 (sym.flags() & STATIC) == 0)
942 return new StaticError(sym);
943 else
944 return sym;
945 } else if (sym.kind < bestSoFar.kind) {
946 bestSoFar = sym;
947 }
949 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
950 env1 = env1.outer;
951 }
953 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
954 if (sym.exists())
955 return sym;
956 if (bestSoFar.exists())
957 return bestSoFar;
959 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
960 for (; e.scope != null; e = e.next()) {
961 sym = e.sym;
962 Type origin = e.getOrigin().owner.type;
963 if (sym.kind == VAR) {
964 if (e.sym.owner.type != origin)
965 sym = sym.clone(e.getOrigin().owner);
966 return isAccessible(env, origin, sym)
967 ? sym : new AccessError(env, origin, sym);
968 }
969 }
971 Symbol origin = null;
972 e = env.toplevel.starImportScope.lookup(name);
973 for (; e.scope != null; e = e.next()) {
974 sym = e.sym;
975 if (sym.kind != VAR)
976 continue;
977 // invariant: sym.kind == VAR
978 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
979 return new AmbiguityError(bestSoFar, sym);
980 else if (bestSoFar.kind >= VAR) {
981 origin = e.getOrigin().owner;
982 bestSoFar = isAccessible(env, origin.type, sym)
983 ? sym : new AccessError(env, origin.type, sym);
984 }
985 }
986 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
987 return bestSoFar.clone(origin);
988 else
989 return bestSoFar;
990 }
992 Warner noteWarner = new Warner();
994 /** Select the best method for a call site among two choices.
995 * @param env The current environment.
996 * @param site The original type from where the
997 * selection takes place.
998 * @param argtypes The invocation's value arguments,
999 * @param typeargtypes The invocation's type arguments,
1000 * @param sym Proposed new best match.
1001 * @param bestSoFar Previously found best match.
1002 * @param allowBoxing Allow boxing conversions of arguments.
1003 * @param useVarargs Box trailing arguments into an array for varargs.
1004 */
1005 @SuppressWarnings("fallthrough")
1006 Symbol selectBest(Env<AttrContext> env,
1007 Type site,
1008 List<Type> argtypes,
1009 List<Type> typeargtypes,
1010 Symbol sym,
1011 Symbol bestSoFar,
1012 boolean allowBoxing,
1013 boolean useVarargs,
1014 boolean operator) {
1015 if (sym.kind == ERR ||
1016 !sym.isInheritedIn(site.tsym, types) ||
1017 (useVarargs && (sym.flags() & VARARGS) == 0)) {
1018 return bestSoFar;
1019 }
1020 Assert.check(sym.kind < AMBIGUOUS);
1021 try {
1022 Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
1023 allowBoxing, useVarargs, Warner.noWarnings);
1024 if (!operator)
1025 currentResolutionContext.addApplicableCandidate(sym, mt);
1026 } catch (InapplicableMethodException ex) {
1027 if (!operator)
1028 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
1029 switch (bestSoFar.kind) {
1030 case ABSENT_MTH:
1031 return new InapplicableSymbolError(currentResolutionContext);
1032 case WRONG_MTH:
1033 if (operator) return bestSoFar;
1034 bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
1035 default:
1036 return bestSoFar;
1037 }
1038 }
1039 if (!isAccessible(env, site, sym)) {
1040 return (bestSoFar.kind == ABSENT_MTH)
1041 ? new AccessError(env, site, sym)
1042 : bestSoFar;
1043 }
1044 return (bestSoFar.kind > AMBIGUOUS)
1045 ? sym
1046 : mostSpecific(argtypes, sym, bestSoFar, env, site,
1047 allowBoxing && operator, useVarargs);
1048 }
1050 /* Return the most specific of the two methods for a call,
1051 * given that both are accessible and applicable.
1052 * @param m1 A new candidate for most specific.
1053 * @param m2 The previous most specific candidate.
1054 * @param env The current environment.
1055 * @param site The original type from where the selection
1056 * takes place.
1057 * @param allowBoxing Allow boxing conversions of arguments.
1058 * @param useVarargs Box trailing arguments into an array for varargs.
1059 */
1060 Symbol mostSpecific(List<Type> argtypes, Symbol m1,
1061 Symbol m2,
1062 Env<AttrContext> env,
1063 final Type site,
1064 boolean allowBoxing,
1065 boolean useVarargs) {
1066 switch (m2.kind) {
1067 case MTH:
1068 if (m1 == m2) return m1;
1069 boolean m1SignatureMoreSpecific =
1070 signatureMoreSpecific(argtypes, env, site, m1, m2, allowBoxing, useVarargs);
1071 boolean m2SignatureMoreSpecific =
1072 signatureMoreSpecific(argtypes, env, site, m2, m1, allowBoxing, useVarargs);
1073 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
1074 Type mt1 = types.memberType(site, m1);
1075 Type mt2 = types.memberType(site, m2);
1076 if (!types.overrideEquivalent(mt1, mt2))
1077 return ambiguityError(m1, m2);
1079 // same signature; select (a) the non-bridge method, or
1080 // (b) the one that overrides the other, or (c) the concrete
1081 // one, or (d) merge both abstract signatures
1082 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
1083 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
1085 // if one overrides or hides the other, use it
1086 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
1087 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
1088 if (types.asSuper(m1Owner.type, m2Owner) != null &&
1089 ((m1.owner.flags_field & INTERFACE) == 0 ||
1090 (m2.owner.flags_field & INTERFACE) != 0) &&
1091 m1.overrides(m2, m1Owner, types, false))
1092 return m1;
1093 if (types.asSuper(m2Owner.type, m1Owner) != null &&
1094 ((m2.owner.flags_field & INTERFACE) == 0 ||
1095 (m1.owner.flags_field & INTERFACE) != 0) &&
1096 m2.overrides(m1, m2Owner, types, false))
1097 return m2;
1098 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
1099 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
1100 if (m1Abstract && !m2Abstract) return m2;
1101 if (m2Abstract && !m1Abstract) return m1;
1102 // both abstract or both concrete
1103 if (!m1Abstract && !m2Abstract)
1104 return ambiguityError(m1, m2);
1105 // check that both signatures have the same erasure
1106 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
1107 m2.erasure(types).getParameterTypes()))
1108 return ambiguityError(m1, m2);
1109 // both abstract, neither overridden; merge throws clause and result type
1110 Type mst = mostSpecificReturnType(mt1, mt2);
1111 if (mst == null) {
1112 // Theoretically, this can't happen, but it is possible
1113 // due to error recovery or mixing incompatible class files
1114 return ambiguityError(m1, m2);
1115 }
1116 Symbol mostSpecific = mst == mt1 ? m1 : m2;
1117 List<Type> allThrown = chk.intersect(mt1.getThrownTypes(), mt2.getThrownTypes());
1118 Type newSig = types.createMethodTypeWithThrown(mostSpecific.type, allThrown);
1119 MethodSymbol result = new MethodSymbol(
1120 mostSpecific.flags(),
1121 mostSpecific.name,
1122 newSig,
1123 mostSpecific.owner) {
1124 @Override
1125 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
1126 if (origin == site.tsym)
1127 return this;
1128 else
1129 return super.implementation(origin, types, checkResult);
1130 }
1131 };
1132 return result;
1133 }
1134 if (m1SignatureMoreSpecific) return m1;
1135 if (m2SignatureMoreSpecific) return m2;
1136 return ambiguityError(m1, m2);
1137 case AMBIGUOUS:
1138 AmbiguityError e = (AmbiguityError)m2;
1139 Symbol err1 = mostSpecific(argtypes, m1, e.sym, env, site, allowBoxing, useVarargs);
1140 Symbol err2 = mostSpecific(argtypes, m1, e.sym2, env, site, allowBoxing, useVarargs);
1141 if (err1 == err2) return err1;
1142 if (err1 == e.sym && err2 == e.sym2) return m2;
1143 if (err1 instanceof AmbiguityError &&
1144 err2 instanceof AmbiguityError &&
1145 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
1146 return ambiguityError(m1, m2);
1147 else
1148 return ambiguityError(err1, err2);
1149 default:
1150 throw new AssertionError();
1151 }
1152 }
1153 //where
1154 private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
1155 Symbol m12 = adjustVarargs(m1, m2, useVarargs);
1156 Symbol m22 = adjustVarargs(m2, m1, useVarargs);
1157 Type mtype1 = types.memberType(site, m12);
1158 Type mtype2 = types.memberType(site, m22);
1160 //check if invocation is more specific
1161 if (invocationMoreSpecific(env, site, m22, mtype1.getParameterTypes(), allowBoxing, useVarargs)) {
1162 return true;
1163 }
1165 //perform structural check
1167 List<Type> formals1 = mtype1.getParameterTypes();
1168 Type lastFormal1 = formals1.last();
1169 List<Type> formals2 = mtype2.getParameterTypes();
1170 Type lastFormal2 = formals2.last();
1171 ListBuffer<Type> newFormals = ListBuffer.lb();
1173 boolean hasStructuralPoly = false;
1174 for (Type actual : actuals) {
1175 //perform formal argument adaptation in case actuals > formals (varargs)
1176 Type f1 = formals1.isEmpty() ?
1177 lastFormal1 : formals1.head;
1178 Type f2 = formals2.isEmpty() ?
1179 lastFormal2 : formals2.head;
1181 //is this a structural actual argument?
1182 boolean isStructuralPoly = actual.hasTag(DEFERRED) &&
1183 (((DeferredType)actual).tree.hasTag(LAMBDA) ||
1184 ((DeferredType)actual).tree.hasTag(REFERENCE));
1186 Type newFormal = f1;
1188 if (isStructuralPoly) {
1189 //for structural arguments only - check that corresponding formals
1190 //are related - if so replace formal with <null>
1191 hasStructuralPoly = true;
1192 DeferredType dt = (DeferredType)actual;
1193 Type t1 = deferredAttr.new DeferredTypeMap(AttrMode.SPECULATIVE, m1, currentResolutionContext.step).apply(dt);
1194 Type t2 = deferredAttr.new DeferredTypeMap(AttrMode.SPECULATIVE, m2, currentResolutionContext.step).apply(dt);
1195 if (t1.isErroneous() || t2.isErroneous() || !isStructuralSubtype(t1, t2)) {
1196 //not structural subtypes - simply fail
1197 return false;
1198 } else {
1199 newFormal = syms.botType;
1200 }
1201 }
1203 newFormals.append(newFormal);
1204 if (newFormals.length() > mtype2.getParameterTypes().length()) {
1205 //expand m2's type so as to fit the new formal arity (varargs)
1206 m22.type = types.createMethodTypeWithParameters(m22.type, m22.type.getParameterTypes().append(f2));
1207 }
1209 formals1 = formals1.isEmpty() ? formals1 : formals1.tail;
1210 formals2 = formals2.isEmpty() ? formals2 : formals2.tail;
1211 }
1213 if (!hasStructuralPoly) {
1214 //if no structural actual was found, we're done
1215 return false;
1216 }
1217 //perform additional adaptation if actuals < formals (varargs)
1218 for (Type t : formals1) {
1219 newFormals.append(t);
1220 }
1221 //check if invocation (with tweaked args) is more specific
1222 return invocationMoreSpecific(env, site, m22, newFormals.toList(), allowBoxing, useVarargs);
1223 }
1224 //where
1225 private boolean invocationMoreSpecific(Env<AttrContext> env, Type site, Symbol m2, List<Type> argtypes1, boolean allowBoxing, boolean useVarargs) {
1226 noteWarner.clear();
1227 Type mst = instantiate(env, site, m2, null,
1228 types.lowerBounds(argtypes1), null,
1229 allowBoxing, false, noteWarner);
1230 return mst != null &&
1231 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
1232 }
1233 //where
1234 private Symbol adjustVarargs(Symbol to, Symbol from, boolean useVarargs) {
1235 List<Type> fromArgs = from.type.getParameterTypes();
1236 List<Type> toArgs = to.type.getParameterTypes();
1237 if (useVarargs &&
1238 (from.flags() & VARARGS) != 0 &&
1239 (to.flags() & VARARGS) != 0) {
1240 Type varargsTypeFrom = fromArgs.last();
1241 Type varargsTypeTo = toArgs.last();
1242 ListBuffer<Type> args = ListBuffer.lb();
1243 if (toArgs.length() < fromArgs.length()) {
1244 //if we are checking a varargs method 'from' against another varargs
1245 //method 'to' (where arity of 'to' < arity of 'from') then expand signature
1246 //of 'to' to 'fit' arity of 'from' (this means adding fake formals to 'to'
1247 //until 'to' signature has the same arity as 'from')
1248 while (fromArgs.head != varargsTypeFrom) {
1249 args.append(toArgs.head == varargsTypeTo ? types.elemtype(varargsTypeTo) : toArgs.head);
1250 fromArgs = fromArgs.tail;
1251 toArgs = toArgs.head == varargsTypeTo ?
1252 toArgs :
1253 toArgs.tail;
1254 }
1255 } else {
1256 //formal argument list is same as original list where last
1257 //argument (array type) is removed
1258 args.appendList(toArgs.reverse().tail.reverse());
1259 }
1260 //append varargs element type as last synthetic formal
1261 args.append(types.elemtype(varargsTypeTo));
1262 Type mtype = types.createMethodTypeWithParameters(to.type, args.toList());
1263 return new MethodSymbol(to.flags_field & ~VARARGS, to.name, mtype, to.owner);
1264 } else {
1265 return to;
1266 }
1267 }
1268 //where
1269 boolean isStructuralSubtype(Type s, Type t) {
1271 Type ret_s = types.findDescriptorType(s).getReturnType();
1272 Type ret_t = types.findDescriptorType(t).getReturnType();
1274 //covariant most specific check for function descriptor return type
1275 if (!types.isSubtype(ret_s, ret_t)) {
1276 return false;
1277 }
1279 List<Type> args_s = types.findDescriptorType(s).getParameterTypes();
1280 List<Type> args_t = types.findDescriptorType(t).getParameterTypes();
1282 //arity must be identical
1283 if (args_s.length() != args_t.length()) {
1284 return false;
1285 }
1287 //invariant most specific check for function descriptor parameter types
1288 if (!types.isSameTypes(args_t, args_s)) {
1289 return false;
1290 }
1292 return true;
1293 }
1294 //where
1295 Type mostSpecificReturnType(Type mt1, Type mt2) {
1296 Type rt1 = mt1.getReturnType();
1297 Type rt2 = mt2.getReturnType();
1299 if (mt1.hasTag(FORALL) && mt2.hasTag(FORALL)) {
1300 //if both are generic methods, adjust return type ahead of subtyping check
1301 rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
1302 }
1303 //first use subtyping, then return type substitutability
1304 if (types.isSubtype(rt1, rt2)) {
1305 return mt1;
1306 } else if (types.isSubtype(rt2, rt1)) {
1307 return mt2;
1308 } else if (types.returnTypeSubstitutable(mt1, mt2)) {
1309 return mt1;
1310 } else if (types.returnTypeSubstitutable(mt2, mt1)) {
1311 return mt2;
1312 } else {
1313 return null;
1314 }
1315 }
1316 //where
1317 Symbol ambiguityError(Symbol m1, Symbol m2) {
1318 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
1319 return (m1.flags() & CLASH) == 0 ? m1 : m2;
1320 } else {
1321 return new AmbiguityError(m1, m2);
1322 }
1323 }
1325 Symbol findMethodInScope(Env<AttrContext> env,
1326 Type site,
1327 Name name,
1328 List<Type> argtypes,
1329 List<Type> typeargtypes,
1330 Scope sc,
1331 Symbol bestSoFar,
1332 boolean allowBoxing,
1333 boolean useVarargs,
1334 boolean operator,
1335 boolean abstractok) {
1336 for (Symbol s : sc.getElementsByName(name, new LookupFilter(abstractok))) {
1337 bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
1338 bestSoFar, allowBoxing, useVarargs, operator);
1339 }
1340 return bestSoFar;
1341 }
1342 //where
1343 class LookupFilter implements Filter<Symbol> {
1345 boolean abstractOk;
1347 LookupFilter(boolean abstractOk) {
1348 this.abstractOk = abstractOk;
1349 }
1351 public boolean accepts(Symbol s) {
1352 long flags = s.flags();
1353 return s.kind == MTH &&
1354 (flags & SYNTHETIC) == 0 &&
1355 (abstractOk ||
1356 (flags & DEFAULT) != 0 ||
1357 (flags & ABSTRACT) == 0);
1358 }
1359 };
1361 /** Find best qualified method matching given name, type and value
1362 * arguments.
1363 * @param env The current environment.
1364 * @param site The original type from where the selection
1365 * takes place.
1366 * @param name The method's name.
1367 * @param argtypes The method's value arguments.
1368 * @param typeargtypes The method's type arguments
1369 * @param allowBoxing Allow boxing conversions of arguments.
1370 * @param useVarargs Box trailing arguments into an array for varargs.
1371 */
1372 Symbol findMethod(Env<AttrContext> env,
1373 Type site,
1374 Name name,
1375 List<Type> argtypes,
1376 List<Type> typeargtypes,
1377 boolean allowBoxing,
1378 boolean useVarargs,
1379 boolean operator) {
1380 Symbol bestSoFar = methodNotFound;
1381 bestSoFar = findMethod(env,
1382 site,
1383 name,
1384 argtypes,
1385 typeargtypes,
1386 site.tsym.type,
1387 bestSoFar,
1388 allowBoxing,
1389 useVarargs,
1390 operator);
1391 reportVerboseResolutionDiagnostic(env.tree.pos(), name, site, argtypes, typeargtypes, bestSoFar);
1392 return bestSoFar;
1393 }
1394 // where
1395 private Symbol findMethod(Env<AttrContext> env,
1396 Type site,
1397 Name name,
1398 List<Type> argtypes,
1399 List<Type> typeargtypes,
1400 Type intype,
1401 Symbol bestSoFar,
1402 boolean allowBoxing,
1403 boolean useVarargs,
1404 boolean operator) {
1405 @SuppressWarnings({"unchecked","rawtypes"})
1406 List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
1407 InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
1408 for (TypeSymbol s : superclasses(intype)) {
1409 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1410 s.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
1411 if (name == names.init) return bestSoFar;
1412 iphase = (iphase == null) ? null : iphase.update(s, this);
1413 if (iphase != null) {
1414 for (Type itype : types.interfaces(s.type)) {
1415 itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
1416 }
1417 }
1418 }
1420 Symbol concrete = bestSoFar.kind < ERR &&
1421 (bestSoFar.flags() & ABSTRACT) == 0 ?
1422 bestSoFar : methodNotFound;
1424 for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
1425 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK && !allowDefaultMethods) break;
1426 //keep searching for abstract methods
1427 for (Type itype : itypes[iphase2.ordinal()]) {
1428 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
1429 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
1430 (itype.tsym.flags() & DEFAULT) == 0) continue;
1431 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
1432 itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
1433 if (concrete != bestSoFar &&
1434 concrete.kind < ERR && bestSoFar.kind < ERR &&
1435 types.isSubSignature(concrete.type, bestSoFar.type)) {
1436 //this is an hack - as javac does not do full membership checks
1437 //most specific ends up comparing abstract methods that might have
1438 //been implemented by some concrete method in a subclass and,
1439 //because of raw override, it is possible for an abstract method
1440 //to be more specific than the concrete method - so we need
1441 //to explicitly call that out (see CR 6178365)
1442 bestSoFar = concrete;
1443 }
1444 }
1445 }
1446 return bestSoFar;
1447 }
1449 enum InterfaceLookupPhase {
1450 ABSTRACT_OK() {
1451 @Override
1452 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1453 //We should not look for abstract methods if receiver is a concrete class
1454 //(as concrete classes are expected to implement all abstracts coming
1455 //from superinterfaces)
1456 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
1457 return this;
1458 } else if (rs.allowDefaultMethods) {
1459 return DEFAULT_OK;
1460 } else {
1461 return null;
1462 }
1463 }
1464 },
1465 DEFAULT_OK() {
1466 @Override
1467 InterfaceLookupPhase update(Symbol s, Resolve rs) {
1468 return this;
1469 }
1470 };
1472 abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
1473 }
1475 /**
1476 * Return an Iterable object to scan the superclasses of a given type.
1477 * It's crucial that the scan is done lazily, as we don't want to accidentally
1478 * access more supertypes than strictly needed (as this could trigger completion
1479 * errors if some of the not-needed supertypes are missing/ill-formed).
1480 */
1481 Iterable<TypeSymbol> superclasses(final Type intype) {
1482 return new Iterable<TypeSymbol>() {
1483 public Iterator<TypeSymbol> iterator() {
1484 return new Iterator<TypeSymbol>() {
1486 List<TypeSymbol> seen = List.nil();
1487 TypeSymbol currentSym = symbolFor(intype);
1488 TypeSymbol prevSym = null;
1490 public boolean hasNext() {
1491 if (currentSym == syms.noSymbol) {
1492 currentSym = symbolFor(types.supertype(prevSym.type));
1493 }
1494 return currentSym != null;
1495 }
1497 public TypeSymbol next() {
1498 prevSym = currentSym;
1499 currentSym = syms.noSymbol;
1500 Assert.check(prevSym != null || prevSym != syms.noSymbol);
1501 return prevSym;
1502 }
1504 public void remove() {
1505 throw new UnsupportedOperationException();
1506 }
1508 TypeSymbol symbolFor(Type t) {
1509 if (!t.hasTag(CLASS) &&
1510 !t.hasTag(TYPEVAR)) {
1511 return null;
1512 }
1513 while (t.hasTag(TYPEVAR))
1514 t = t.getUpperBound();
1515 if (seen.contains(t.tsym)) {
1516 //degenerate case in which we have a circular
1517 //class hierarchy - because of ill-formed classfiles
1518 return null;
1519 }
1520 seen = seen.prepend(t.tsym);
1521 return t.tsym;
1522 }
1523 };
1524 }
1525 };
1526 }
1528 /** Find unqualified method matching given name, type and value arguments.
1529 * @param env The current environment.
1530 * @param name The method's name.
1531 * @param argtypes The method's value arguments.
1532 * @param typeargtypes The method's type arguments.
1533 * @param allowBoxing Allow boxing conversions of arguments.
1534 * @param useVarargs Box trailing arguments into an array for varargs.
1535 */
1536 Symbol findFun(Env<AttrContext> env, Name name,
1537 List<Type> argtypes, List<Type> typeargtypes,
1538 boolean allowBoxing, boolean useVarargs) {
1539 Symbol bestSoFar = methodNotFound;
1540 Symbol sym;
1541 Env<AttrContext> env1 = env;
1542 boolean staticOnly = false;
1543 while (env1.outer != null) {
1544 if (isStatic(env1)) staticOnly = true;
1545 sym = findMethod(
1546 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
1547 allowBoxing, useVarargs, false);
1548 if (sym.exists()) {
1549 if (staticOnly &&
1550 sym.kind == MTH &&
1551 sym.owner.kind == TYP &&
1552 (sym.flags() & STATIC) == 0) return new StaticError(sym);
1553 else return sym;
1554 } else if (sym.kind < bestSoFar.kind) {
1555 bestSoFar = sym;
1556 }
1557 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1558 env1 = env1.outer;
1559 }
1561 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1562 typeargtypes, allowBoxing, useVarargs, false);
1563 if (sym.exists())
1564 return sym;
1566 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
1567 for (; e.scope != null; e = e.next()) {
1568 sym = e.sym;
1569 Type origin = e.getOrigin().owner.type;
1570 if (sym.kind == MTH) {
1571 if (e.sym.owner.type != origin)
1572 sym = sym.clone(e.getOrigin().owner);
1573 if (!isAccessible(env, origin, sym))
1574 sym = new AccessError(env, origin, sym);
1575 bestSoFar = selectBest(env, origin,
1576 argtypes, typeargtypes,
1577 sym, bestSoFar,
1578 allowBoxing, useVarargs, false);
1579 }
1580 }
1581 if (bestSoFar.exists())
1582 return bestSoFar;
1584 e = env.toplevel.starImportScope.lookup(name);
1585 for (; e.scope != null; e = e.next()) {
1586 sym = e.sym;
1587 Type origin = e.getOrigin().owner.type;
1588 if (sym.kind == MTH) {
1589 if (e.sym.owner.type != origin)
1590 sym = sym.clone(e.getOrigin().owner);
1591 if (!isAccessible(env, origin, sym))
1592 sym = new AccessError(env, origin, sym);
1593 bestSoFar = selectBest(env, origin,
1594 argtypes, typeargtypes,
1595 sym, bestSoFar,
1596 allowBoxing, useVarargs, false);
1597 }
1598 }
1599 return bestSoFar;
1600 }
1602 /** Load toplevel or member class with given fully qualified name and
1603 * verify that it is accessible.
1604 * @param env The current environment.
1605 * @param name The fully qualified name of the class to be loaded.
1606 */
1607 Symbol loadClass(Env<AttrContext> env, Name name) {
1608 try {
1609 ClassSymbol c = reader.loadClass(name);
1610 return isAccessible(env, c) ? c : new AccessError(c);
1611 } catch (ClassReader.BadClassFile err) {
1612 throw err;
1613 } catch (CompletionFailure ex) {
1614 return typeNotFound;
1615 }
1616 }
1618 /** Find qualified member type.
1619 * @param env The current environment.
1620 * @param site The original type from where the selection takes
1621 * place.
1622 * @param name The type's name.
1623 * @param c The class to search for the member type. This is
1624 * always a superclass or implemented interface of
1625 * site's class.
1626 */
1627 Symbol findMemberType(Env<AttrContext> env,
1628 Type site,
1629 Name name,
1630 TypeSymbol c) {
1631 Symbol bestSoFar = typeNotFound;
1632 Symbol sym;
1633 Scope.Entry e = c.members().lookup(name);
1634 while (e.scope != null) {
1635 if (e.sym.kind == TYP) {
1636 return isAccessible(env, site, e.sym)
1637 ? e.sym
1638 : new AccessError(env, site, e.sym);
1639 }
1640 e = e.next();
1641 }
1642 Type st = types.supertype(c.type);
1643 if (st != null && st.hasTag(CLASS)) {
1644 sym = findMemberType(env, site, name, st.tsym);
1645 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1646 }
1647 for (List<Type> l = types.interfaces(c.type);
1648 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1649 l = l.tail) {
1650 sym = findMemberType(env, site, name, l.head.tsym);
1651 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1652 sym.owner != bestSoFar.owner)
1653 bestSoFar = new AmbiguityError(bestSoFar, sym);
1654 else if (sym.kind < bestSoFar.kind)
1655 bestSoFar = sym;
1656 }
1657 return bestSoFar;
1658 }
1660 /** Find a global type in given scope and load corresponding class.
1661 * @param env The current environment.
1662 * @param scope The scope in which to look for the type.
1663 * @param name The type's name.
1664 */
1665 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1666 Symbol bestSoFar = typeNotFound;
1667 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1668 Symbol sym = loadClass(env, e.sym.flatName());
1669 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1670 bestSoFar != sym)
1671 return new AmbiguityError(bestSoFar, sym);
1672 else if (sym.kind < bestSoFar.kind)
1673 bestSoFar = sym;
1674 }
1675 return bestSoFar;
1676 }
1678 /** Find an unqualified type symbol.
1679 * @param env The current environment.
1680 * @param name The type's name.
1681 */
1682 Symbol findType(Env<AttrContext> env, Name name) {
1683 Symbol bestSoFar = typeNotFound;
1684 Symbol sym;
1685 boolean staticOnly = false;
1686 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1687 if (isStatic(env1)) staticOnly = true;
1688 for (Scope.Entry e = env1.info.scope.lookup(name);
1689 e.scope != null;
1690 e = e.next()) {
1691 if (e.sym.kind == TYP) {
1692 if (staticOnly &&
1693 e.sym.type.hasTag(TYPEVAR) &&
1694 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1695 return e.sym;
1696 }
1697 }
1699 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1700 env1.enclClass.sym);
1701 if (staticOnly && sym.kind == TYP &&
1702 sym.type.hasTag(CLASS) &&
1703 sym.type.getEnclosingType().hasTag(CLASS) &&
1704 env1.enclClass.sym.type.isParameterized() &&
1705 sym.type.getEnclosingType().isParameterized())
1706 return new StaticError(sym);
1707 else if (sym.exists()) return sym;
1708 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1710 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1711 if ((encl.sym.flags() & STATIC) != 0)
1712 staticOnly = true;
1713 }
1715 if (!env.tree.hasTag(IMPORT)) {
1716 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1717 if (sym.exists()) return sym;
1718 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1720 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1721 if (sym.exists()) return sym;
1722 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1724 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1725 if (sym.exists()) return sym;
1726 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1727 }
1729 return bestSoFar;
1730 }
1732 /** Find an unqualified identifier which matches a specified kind set.
1733 * @param env The current environment.
1734 * @param name The indentifier's name.
1735 * @param kind Indicates the possible symbol kinds
1736 * (a subset of VAL, TYP, PCK).
1737 */
1738 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1739 Symbol bestSoFar = typeNotFound;
1740 Symbol sym;
1742 if ((kind & VAR) != 0) {
1743 sym = findVar(env, name);
1744 if (sym.exists()) return sym;
1745 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1746 }
1748 if ((kind & TYP) != 0) {
1749 sym = findType(env, name);
1750 if (sym.exists()) return sym;
1751 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1752 }
1754 if ((kind & PCK) != 0) return reader.enterPackage(name);
1755 else return bestSoFar;
1756 }
1758 /** Find an identifier in a package which matches a specified kind set.
1759 * @param env The current environment.
1760 * @param name The identifier's name.
1761 * @param kind Indicates the possible symbol kinds
1762 * (a nonempty subset of TYP, PCK).
1763 */
1764 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1765 Name name, int kind) {
1766 Name fullname = TypeSymbol.formFullName(name, pck);
1767 Symbol bestSoFar = typeNotFound;
1768 PackageSymbol pack = null;
1769 if ((kind & PCK) != 0) {
1770 pack = reader.enterPackage(fullname);
1771 if (pack.exists()) return pack;
1772 }
1773 if ((kind & TYP) != 0) {
1774 Symbol sym = loadClass(env, fullname);
1775 if (sym.exists()) {
1776 // don't allow programs to use flatnames
1777 if (name == sym.name) return sym;
1778 }
1779 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1780 }
1781 return (pack != null) ? pack : bestSoFar;
1782 }
1784 /** Find an identifier among the members of a given type `site'.
1785 * @param env The current environment.
1786 * @param site The type containing the symbol to be found.
1787 * @param name The identifier's name.
1788 * @param kind Indicates the possible symbol kinds
1789 * (a subset of VAL, TYP).
1790 */
1791 Symbol findIdentInType(Env<AttrContext> env, Type site,
1792 Name name, int kind) {
1793 Symbol bestSoFar = typeNotFound;
1794 Symbol sym;
1795 if ((kind & VAR) != 0) {
1796 sym = findField(env, site, name, site.tsym);
1797 if (sym.exists()) return sym;
1798 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1799 }
1801 if ((kind & TYP) != 0) {
1802 sym = findMemberType(env, site, name, site.tsym);
1803 if (sym.exists()) return sym;
1804 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1805 }
1806 return bestSoFar;
1807 }
1809 /* ***************************************************************************
1810 * Access checking
1811 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1812 * an error message in the process
1813 ****************************************************************************/
1815 /** If `sym' is a bad symbol: report error and return errSymbol
1816 * else pass through unchanged,
1817 * additional arguments duplicate what has been used in trying to find the
1818 * symbol {@literal (--> flyweight pattern)}. This improves performance since we
1819 * expect misses to happen frequently.
1820 *
1821 * @param sym The symbol that was found, or a ResolveError.
1822 * @param pos The position to use for error reporting.
1823 * @param location The symbol the served as a context for this lookup
1824 * @param site The original type from where the selection took place.
1825 * @param name The symbol's name.
1826 * @param qualified Did we get here through a qualified expression resolution?
1827 * @param argtypes The invocation's value arguments,
1828 * if we looked for a method.
1829 * @param typeargtypes The invocation's type arguments,
1830 * if we looked for a method.
1831 * @param logResolveHelper helper class used to log resolve errors
1832 */
1833 Symbol accessInternal(Symbol sym,
1834 DiagnosticPosition pos,
1835 Symbol location,
1836 Type site,
1837 Name name,
1838 boolean qualified,
1839 List<Type> argtypes,
1840 List<Type> typeargtypes,
1841 LogResolveHelper logResolveHelper) {
1842 if (sym.kind >= AMBIGUOUS) {
1843 ResolveError errSym = (ResolveError)sym;
1844 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1845 argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
1846 if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
1847 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
1848 }
1849 }
1850 return sym;
1851 }
1853 /**
1854 * Variant of the generalized access routine, to be used for generating method
1855 * resolution diagnostics
1856 */
1857 Symbol accessMethod(Symbol sym,
1858 DiagnosticPosition pos,
1859 Symbol location,
1860 Type site,
1861 Name name,
1862 boolean qualified,
1863 List<Type> argtypes,
1864 List<Type> typeargtypes) {
1865 return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
1866 }
1868 /** Same as original accessMethod(), but without location.
1869 */
1870 Symbol accessMethod(Symbol sym,
1871 DiagnosticPosition pos,
1872 Type site,
1873 Name name,
1874 boolean qualified,
1875 List<Type> argtypes,
1876 List<Type> typeargtypes) {
1877 return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
1878 }
1880 /**
1881 * Variant of the generalized access routine, to be used for generating variable,
1882 * type resolution diagnostics
1883 */
1884 Symbol accessBase(Symbol sym,
1885 DiagnosticPosition pos,
1886 Symbol location,
1887 Type site,
1888 Name name,
1889 boolean qualified) {
1890 return accessInternal(sym, pos, location, site, name, qualified, List.<Type>nil(), null, basicLogResolveHelper);
1891 }
1893 /** Same as original accessBase(), but without location.
1894 */
1895 Symbol accessBase(Symbol sym,
1896 DiagnosticPosition pos,
1897 Type site,
1898 Name name,
1899 boolean qualified) {
1900 return accessBase(sym, pos, site.tsym, site, name, qualified);
1901 }
1903 interface LogResolveHelper {
1904 boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
1905 List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
1906 }
1908 LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
1909 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
1910 return !site.isErroneous();
1911 }
1912 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
1913 return argtypes;
1914 }
1915 };
1917 LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
1918 public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
1919 return !site.isErroneous() &&
1920 !Type.isErroneous(argtypes) &&
1921 (typeargtypes == null || !Type.isErroneous(typeargtypes));
1922 }
1923 public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
1924 if (syms.operatorNames.contains(name)) {
1925 return argtypes;
1926 } else {
1927 Symbol msym = errSym.kind == WRONG_MTH ?
1928 ((InapplicableSymbolError)errSym).errCandidate().sym : accessedSym;
1930 List<Type> argtypes2 = Type.map(argtypes,
1931 deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, msym, currentResolutionContext.step));
1933 if (msym != accessedSym) {
1934 //fixup deferred type caches - this 'hack' is required because the symbol
1935 //returned by InapplicableSymbolError.access() will hide the candidate
1936 //method symbol that can be used for lookups in the speculative cache,
1937 //causing problems in Attr.checkId()
1938 for (Type t : argtypes) {
1939 if (t.hasTag(DEFERRED)) {
1940 DeferredType dt = (DeferredType)t;
1941 dt.speculativeCache.dupAllTo(msym, accessedSym);
1942 }
1943 }
1944 }
1945 return argtypes2;
1946 }
1947 }
1948 };
1950 /** Check that sym is not an abstract method.
1951 */
1952 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1953 if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
1954 log.error(pos, "abstract.cant.be.accessed.directly",
1955 kindName(sym), sym, sym.location());
1956 }
1958 /* ***************************************************************************
1959 * Debugging
1960 ****************************************************************************/
1962 /** print all scopes starting with scope s and proceeding outwards.
1963 * used for debugging.
1964 */
1965 public void printscopes(Scope s) {
1966 while (s != null) {
1967 if (s.owner != null)
1968 System.err.print(s.owner + ": ");
1969 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1970 if ((e.sym.flags() & ABSTRACT) != 0)
1971 System.err.print("abstract ");
1972 System.err.print(e.sym + " ");
1973 }
1974 System.err.println();
1975 s = s.next;
1976 }
1977 }
1979 void printscopes(Env<AttrContext> env) {
1980 while (env.outer != null) {
1981 System.err.println("------------------------------");
1982 printscopes(env.info.scope);
1983 env = env.outer;
1984 }
1985 }
1987 public void printscopes(Type t) {
1988 while (t.hasTag(CLASS)) {
1989 printscopes(t.tsym.members());
1990 t = types.supertype(t);
1991 }
1992 }
1994 /* ***************************************************************************
1995 * Name resolution
1996 * Naming conventions are as for symbol lookup
1997 * Unlike the find... methods these methods will report access errors
1998 ****************************************************************************/
2000 /** Resolve an unqualified (non-method) identifier.
2001 * @param pos The position to use for error reporting.
2002 * @param env The environment current at the identifier use.
2003 * @param name The identifier's name.
2004 * @param kind The set of admissible symbol kinds for the identifier.
2005 */
2006 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
2007 Name name, int kind) {
2008 return accessBase(
2009 findIdent(env, name, kind),
2010 pos, env.enclClass.sym.type, name, false);
2011 }
2013 /** Resolve an unqualified method identifier.
2014 * @param pos The position to use for error reporting.
2015 * @param env The environment current at the method invocation.
2016 * @param name The identifier's name.
2017 * @param argtypes The types of the invocation's value arguments.
2018 * @param typeargtypes The types of the invocation's type arguments.
2019 */
2020 Symbol resolveMethod(DiagnosticPosition pos,
2021 Env<AttrContext> env,
2022 Name name,
2023 List<Type> argtypes,
2024 List<Type> typeargtypes) {
2025 return lookupMethod(env, pos, env.enclClass.sym, new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
2026 @Override
2027 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2028 return findFun(env, name, argtypes, typeargtypes,
2029 phase.isBoxingRequired(),
2030 phase.isVarargsRequired());
2031 }
2032 });
2033 }
2035 /** Resolve a qualified method identifier
2036 * @param pos The position to use for error reporting.
2037 * @param env The environment current at the method invocation.
2038 * @param site The type of the qualifying expression, in which
2039 * identifier is searched.
2040 * @param name The identifier's name.
2041 * @param argtypes The types of the invocation's value arguments.
2042 * @param typeargtypes The types of the invocation's type arguments.
2043 */
2044 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2045 Type site, Name name, List<Type> argtypes,
2046 List<Type> typeargtypes) {
2047 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
2048 }
2049 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
2050 Symbol location, Type site, Name name, List<Type> argtypes,
2051 List<Type> typeargtypes) {
2052 return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
2053 }
2054 private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
2055 DiagnosticPosition pos, Env<AttrContext> env,
2056 Symbol location, Type site, Name name, List<Type> argtypes,
2057 List<Type> typeargtypes) {
2058 return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
2059 @Override
2060 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2061 return findMethod(env, site, name, argtypes, typeargtypes,
2062 phase.isBoxingRequired(),
2063 phase.isVarargsRequired(), false);
2064 }
2065 @Override
2066 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2067 if (sym.kind >= AMBIGUOUS) {
2068 sym = super.access(env, pos, location, sym);
2069 } else if (allowMethodHandles) {
2070 MethodSymbol msym = (MethodSymbol)sym;
2071 if (msym.isSignaturePolymorphic(types)) {
2072 env.info.pendingResolutionPhase = BASIC;
2073 return findPolymorphicSignatureInstance(env, sym, argtypes);
2074 }
2075 }
2076 return sym;
2077 }
2078 });
2079 }
2081 /** Find or create an implicit method of exactly the given type (after erasure).
2082 * Searches in a side table, not the main scope of the site.
2083 * This emulates the lookup process required by JSR 292 in JVM.
2084 * @param env Attribution environment
2085 * @param spMethod signature polymorphic method - i.e. MH.invokeExact
2086 * @param argtypes The required argument types
2087 */
2088 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
2089 Symbol spMethod,
2090 List<Type> argtypes) {
2091 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
2092 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
2093 for (Symbol sym : polymorphicSignatureScope.getElementsByName(spMethod.name)) {
2094 if (types.isSameType(mtype, sym.type)) {
2095 return sym;
2096 }
2097 }
2099 // create the desired method
2100 long flags = ABSTRACT | HYPOTHETICAL | spMethod.flags() & Flags.AccessFlags;
2101 Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner);
2102 polymorphicSignatureScope.enter(msym);
2103 return msym;
2104 }
2106 /** Resolve a qualified method identifier, throw a fatal error if not
2107 * found.
2108 * @param pos The position to use for error reporting.
2109 * @param env The environment current at the method invocation.
2110 * @param site The type of the qualifying expression, in which
2111 * identifier is searched.
2112 * @param name The identifier's name.
2113 * @param argtypes The types of the invocation's value arguments.
2114 * @param typeargtypes The types of the invocation's type arguments.
2115 */
2116 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
2117 Type site, Name name,
2118 List<Type> argtypes,
2119 List<Type> typeargtypes) {
2120 MethodResolutionContext resolveContext = new MethodResolutionContext();
2121 resolveContext.internalResolution = true;
2122 Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
2123 site, name, argtypes, typeargtypes);
2124 if (sym.kind == MTH) return (MethodSymbol)sym;
2125 else throw new FatalError(
2126 diags.fragment("fatal.err.cant.locate.meth",
2127 name));
2128 }
2130 /** Resolve constructor.
2131 * @param pos The position to use for error reporting.
2132 * @param env The environment current at the constructor invocation.
2133 * @param site The type of class for which a constructor is searched.
2134 * @param argtypes The types of the constructor invocation's value
2135 * arguments.
2136 * @param typeargtypes The types of the constructor invocation's type
2137 * arguments.
2138 */
2139 Symbol resolveConstructor(DiagnosticPosition pos,
2140 Env<AttrContext> env,
2141 Type site,
2142 List<Type> argtypes,
2143 List<Type> typeargtypes) {
2144 return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
2145 }
2147 private Symbol resolveConstructor(MethodResolutionContext resolveContext,
2148 final DiagnosticPosition pos,
2149 Env<AttrContext> env,
2150 Type site,
2151 List<Type> argtypes,
2152 List<Type> typeargtypes) {
2153 return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2154 @Override
2155 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2156 return findConstructor(pos, env, site, argtypes, typeargtypes,
2157 phase.isBoxingRequired(),
2158 phase.isVarargsRequired());
2159 }
2160 });
2161 }
2163 /** Resolve a constructor, throw a fatal error if not found.
2164 * @param pos The position to use for error reporting.
2165 * @param env The environment current at the method invocation.
2166 * @param site The type to be constructed.
2167 * @param argtypes The types of the invocation's value arguments.
2168 * @param typeargtypes The types of the invocation's type arguments.
2169 */
2170 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2171 Type site,
2172 List<Type> argtypes,
2173 List<Type> typeargtypes) {
2174 MethodResolutionContext resolveContext = new MethodResolutionContext();
2175 resolveContext.internalResolution = true;
2176 Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
2177 if (sym.kind == MTH) return (MethodSymbol)sym;
2178 else throw new FatalError(
2179 diags.fragment("fatal.err.cant.locate.ctor", site));
2180 }
2182 Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
2183 Type site, List<Type> argtypes,
2184 List<Type> typeargtypes,
2185 boolean allowBoxing,
2186 boolean useVarargs) {
2187 Symbol sym = findMethod(env, site,
2188 names.init, argtypes,
2189 typeargtypes, allowBoxing,
2190 useVarargs, false);
2191 chk.checkDeprecated(pos, env.info.scope.owner, sym);
2192 return sym;
2193 }
2195 /** Resolve constructor using diamond inference.
2196 * @param pos The position to use for error reporting.
2197 * @param env The environment current at the constructor invocation.
2198 * @param site The type of class for which a constructor is searched.
2199 * The scope of this class has been touched in attribution.
2200 * @param argtypes The types of the constructor invocation's value
2201 * arguments.
2202 * @param typeargtypes The types of the constructor invocation's type
2203 * arguments.
2204 */
2205 Symbol resolveDiamond(DiagnosticPosition pos,
2206 Env<AttrContext> env,
2207 Type site,
2208 List<Type> argtypes,
2209 List<Type> typeargtypes) {
2210 return lookupMethod(env, pos, site.tsym, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
2211 @Override
2212 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2213 return findDiamond(env, site, argtypes, typeargtypes,
2214 phase.isBoxingRequired(),
2215 phase.isVarargsRequired());
2216 }
2217 @Override
2218 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2219 if (sym.kind >= AMBIGUOUS) {
2220 final JCDiagnostic details = sym.kind == WRONG_MTH ?
2221 ((InapplicableSymbolError)sym).errCandidate().details :
2222 null;
2223 sym = new InapplicableSymbolError(sym.kind, "diamondError", currentResolutionContext) {
2224 @Override
2225 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
2226 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
2227 String key = details == null ?
2228 "cant.apply.diamond" :
2229 "cant.apply.diamond.1";
2230 return diags.create(dkind, log.currentSource(), pos, key,
2231 diags.fragment("diamond", site.tsym), details);
2232 }
2233 };
2234 sym = accessMethod(sym, pos, site, names.init, true, argtypes, typeargtypes);
2235 env.info.pendingResolutionPhase = currentResolutionContext.step;
2236 }
2237 return sym;
2238 }
2239 });
2240 }
2242 /** This method scans all the constructor symbol in a given class scope -
2243 * assuming that the original scope contains a constructor of the kind:
2244 * {@code Foo(X x, Y y)}, where X,Y are class type-variables declared in Foo,
2245 * a method check is executed against the modified constructor type:
2246 * {@code <X,Y>Foo<X,Y>(X x, Y y)}. This is crucial in order to enable diamond
2247 * inference. The inferred return type of the synthetic constructor IS
2248 * the inferred type for the diamond operator.
2249 */
2250 private Symbol findDiamond(Env<AttrContext> env,
2251 Type site,
2252 List<Type> argtypes,
2253 List<Type> typeargtypes,
2254 boolean allowBoxing,
2255 boolean useVarargs) {
2256 Symbol bestSoFar = methodNotFound;
2257 for (Scope.Entry e = site.tsym.members().lookup(names.init);
2258 e.scope != null;
2259 e = e.next()) {
2260 final Symbol sym = e.sym;
2261 //- System.out.println(" e " + e.sym);
2262 if (sym.kind == MTH &&
2263 (sym.flags_field & SYNTHETIC) == 0) {
2264 List<Type> oldParams = e.sym.type.hasTag(FORALL) ?
2265 ((ForAll)sym.type).tvars :
2266 List.<Type>nil();
2267 Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
2268 types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
2269 MethodSymbol newConstr = new MethodSymbol(sym.flags(), names.init, constrType, site.tsym) {
2270 @Override
2271 public Symbol baseSymbol() {
2272 return sym;
2273 }
2274 };
2275 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
2276 newConstr,
2277 bestSoFar,
2278 allowBoxing,
2279 useVarargs,
2280 false);
2281 }
2282 }
2283 return bestSoFar;
2284 }
2288 /** Resolve operator.
2289 * @param pos The position to use for error reporting.
2290 * @param optag The tag of the operation tree.
2291 * @param env The environment current at the operation.
2292 * @param argtypes The types of the operands.
2293 */
2294 Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
2295 Env<AttrContext> env, List<Type> argtypes) {
2296 MethodResolutionContext prevResolutionContext = currentResolutionContext;
2297 try {
2298 currentResolutionContext = new MethodResolutionContext();
2299 Name name = treeinfo.operatorName(optag);
2300 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
2301 null, false, false, true);
2302 if (boxingEnabled && sym.kind >= WRONG_MTHS)
2303 sym = findMethod(env, syms.predefClass.type, name, argtypes,
2304 null, true, false, true);
2305 return accessMethod(sym, pos, env.enclClass.sym.type, name,
2306 false, argtypes, null);
2307 }
2308 finally {
2309 currentResolutionContext = prevResolutionContext;
2310 }
2311 }
2313 /** Resolve operator.
2314 * @param pos The position to use for error reporting.
2315 * @param optag The tag of the operation tree.
2316 * @param env The environment current at the operation.
2317 * @param arg The type of the operand.
2318 */
2319 Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
2320 return resolveOperator(pos, optag, env, List.of(arg));
2321 }
2323 /** Resolve binary operator.
2324 * @param pos The position to use for error reporting.
2325 * @param optag The tag of the operation tree.
2326 * @param env The environment current at the operation.
2327 * @param left The types of the left operand.
2328 * @param right The types of the right operand.
2329 */
2330 Symbol resolveBinaryOperator(DiagnosticPosition pos,
2331 JCTree.Tag optag,
2332 Env<AttrContext> env,
2333 Type left,
2334 Type right) {
2335 return resolveOperator(pos, optag, env, List.of(left, right));
2336 }
2338 /**
2339 * Resolution of member references is typically done as a single
2340 * overload resolution step, where the argument types A are inferred from
2341 * the target functional descriptor.
2342 *
2343 * If the member reference is a method reference with a type qualifier,
2344 * a two-step lookup process is performed. The first step uses the
2345 * expected argument list A, while the second step discards the first
2346 * type from A (which is treated as a receiver type).
2347 *
2348 * There are two cases in which inference is performed: (i) if the member
2349 * reference is a constructor reference and the qualifier type is raw - in
2350 * which case diamond inference is used to infer a parameterization for the
2351 * type qualifier; (ii) if the member reference is an unbound reference
2352 * where the type qualifier is raw - in that case, during the unbound lookup
2353 * the receiver argument type is used to infer an instantiation for the raw
2354 * qualifier type.
2355 *
2356 * When a multi-step resolution process is exploited, it is an error
2357 * if two candidates are found (ambiguity).
2358 *
2359 * This routine returns a pair (T,S), where S is the member reference symbol,
2360 * and T is the type of the class in which S is defined. This is necessary as
2361 * the type T might be dynamically inferred (i.e. if constructor reference
2362 * has a raw qualifier).
2363 */
2364 Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(DiagnosticPosition pos,
2365 Env<AttrContext> env,
2366 JCMemberReference referenceTree,
2367 Type site,
2368 Name name, List<Type> argtypes,
2369 List<Type> typeargtypes,
2370 boolean boxingAllowed) {
2371 MethodResolutionPhase maxPhase = boxingAllowed ? VARARITY : BASIC;
2372 //step 1 - bound lookup
2373 ReferenceLookupHelper boundLookupHelper = name.equals(names.init) ?
2374 new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase) :
2375 new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
2376 Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
2377 Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(), site.tsym, boundLookupHelper);
2379 //step 2 - unbound lookup
2380 ReferenceLookupHelper unboundLookupHelper = boundLookupHelper.unboundLookup();
2381 Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
2382 Symbol unboundSym = lookupMethod(unboundEnv, env.tree.pos(), site.tsym, unboundLookupHelper);
2384 //merge results
2385 Pair<Symbol, ReferenceLookupHelper> res;
2386 if (unboundSym.kind != MTH) {
2387 res = new Pair<Symbol, ReferenceLookupHelper>(boundSym, boundLookupHelper);
2388 env.info.pendingResolutionPhase = boundEnv.info.pendingResolutionPhase;
2389 } else if (boundSym.kind == MTH) {
2390 res = new Pair<Symbol, ReferenceLookupHelper>(ambiguityError(boundSym, unboundSym), boundLookupHelper);
2391 env.info.pendingResolutionPhase = boundEnv.info.pendingResolutionPhase;
2392 } else {
2393 res = new Pair<Symbol, ReferenceLookupHelper>(unboundSym, unboundLookupHelper);
2394 env.info.pendingResolutionPhase = unboundEnv.info.pendingResolutionPhase;
2395 }
2397 return res;
2398 }
2400 /**
2401 * Helper for defining custom method-like lookup logic; a lookup helper
2402 * provides hooks for (i) the actual lookup logic and (ii) accessing the
2403 * lookup result (this step might result in compiler diagnostics to be generated)
2404 */
2405 abstract class LookupHelper {
2407 /** name of the symbol to lookup */
2408 Name name;
2410 /** location in which the lookup takes place */
2411 Type site;
2413 /** actual types used during the lookup */
2414 List<Type> argtypes;
2416 /** type arguments used during the lookup */
2417 List<Type> typeargtypes;
2419 /** Max overload resolution phase handled by this helper */
2420 MethodResolutionPhase maxPhase;
2422 LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
2423 this.name = name;
2424 this.site = site;
2425 this.argtypes = argtypes;
2426 this.typeargtypes = typeargtypes;
2427 this.maxPhase = maxPhase;
2428 }
2430 /**
2431 * Should lookup stop at given phase with given result
2432 */
2433 protected boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
2434 return phase.ordinal() > maxPhase.ordinal() ||
2435 sym.kind < ERRONEOUS || sym.kind == AMBIGUOUS;
2436 }
2438 /**
2439 * Search for a symbol under a given overload resolution phase - this method
2440 * is usually called several times, once per each overload resolution phase
2441 */
2442 abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
2444 /**
2445 * Validate the result of the lookup
2446 */
2447 abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
2448 }
2450 abstract class BasicLookupHelper extends LookupHelper {
2452 BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
2453 super(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
2454 }
2456 @Override
2457 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2458 if (sym.kind >= AMBIGUOUS) {
2459 //if nothing is found return the 'first' error
2460 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
2461 }
2462 return sym;
2463 }
2464 }
2466 /**
2467 * Helper class for member reference lookup. A reference lookup helper
2468 * defines the basic logic for member reference lookup; a method gives
2469 * access to an 'unbound' helper used to perform an unbound member
2470 * reference lookup.
2471 */
2472 abstract class ReferenceLookupHelper extends LookupHelper {
2474 /** The member reference tree */
2475 JCMemberReference referenceTree;
2477 ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
2478 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
2479 super(name, site, argtypes, typeargtypes, maxPhase);
2480 this.referenceTree = referenceTree;
2482 }
2484 /**
2485 * Returns an unbound version of this lookup helper. By default, this
2486 * method returns an dummy lookup helper.
2487 */
2488 ReferenceLookupHelper unboundLookup() {
2489 //dummy loopkup helper that always return 'methodNotFound'
2490 return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
2491 @Override
2492 ReferenceLookupHelper unboundLookup() {
2493 return this;
2494 }
2495 @Override
2496 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2497 return methodNotFound;
2498 }
2499 @Override
2500 ReferenceKind referenceKind(Symbol sym) {
2501 Assert.error();
2502 return null;
2503 }
2504 };
2505 }
2507 /**
2508 * Get the kind of the member reference
2509 */
2510 abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
2512 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
2513 //skip error reporting
2514 return sym;
2515 }
2516 }
2518 /**
2519 * Helper class for method reference lookup. The lookup logic is based
2520 * upon Resolve.findMethod; in certain cases, this helper class has a
2521 * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
2522 * In such cases, non-static lookup results are thrown away.
2523 */
2524 class MethodReferenceLookupHelper extends ReferenceLookupHelper {
2526 MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
2527 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
2528 super(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
2529 }
2531 protected Symbol lookupReferenceInternal(Env<AttrContext> env, MethodResolutionPhase phase) {
2532 return findMethod(env, site, name, argtypes, typeargtypes,
2533 phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
2534 }
2536 protected Symbol adjustLookupResult(Env<AttrContext> env, Symbol sym) {
2537 return !TreeInfo.isStaticSelector(referenceTree.expr, names) ||
2538 sym.kind != MTH ||
2539 sym.isStatic() ? sym : new StaticError(sym);
2540 }
2542 @Override
2543 final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2544 return adjustLookupResult(env, lookupReferenceInternal(env, phase));
2545 }
2547 @Override
2548 ReferenceLookupHelper unboundLookup() {
2549 if (TreeInfo.isStaticSelector(referenceTree.expr, names) &&
2550 argtypes.nonEmpty() &&
2551 types.isSubtypeUnchecked(argtypes.head, site)) {
2552 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
2553 site, argtypes, typeargtypes, maxPhase);
2554 } else {
2555 return super.unboundLookup();
2556 }
2557 }
2559 @Override
2560 ReferenceKind referenceKind(Symbol sym) {
2561 if (sym.isStatic()) {
2562 return TreeInfo.isStaticSelector(referenceTree.expr, names) ?
2563 ReferenceKind.STATIC : ReferenceKind.STATIC_EVAL;
2564 } else {
2565 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
2566 return selName != null && selName == names._super ?
2567 ReferenceKind.SUPER :
2568 ReferenceKind.BOUND;
2569 }
2570 }
2571 }
2573 /**
2574 * Helper class for unbound method reference lookup. Essentially the same
2575 * as the basic method reference lookup helper; main difference is that static
2576 * lookup results are thrown away. If qualifier type is raw, an attempt to
2577 * infer a parameterized type is made using the first actual argument (that
2578 * would otherwise be ignored during the lookup).
2579 */
2580 class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
2582 UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
2583 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
2584 super(referenceTree, name,
2585 site.isRaw() ? types.asSuper(argtypes.head, site.tsym) : site,
2586 argtypes.tail, typeargtypes, maxPhase);
2587 }
2589 @Override
2590 protected Symbol adjustLookupResult(Env<AttrContext> env, Symbol sym) {
2591 return sym.kind != MTH || !sym.isStatic() ? sym : new StaticError(sym);
2592 }
2594 @Override
2595 ReferenceLookupHelper unboundLookup() {
2596 return this;
2597 }
2599 @Override
2600 ReferenceKind referenceKind(Symbol sym) {
2601 return ReferenceKind.UNBOUND;
2602 }
2603 }
2605 /**
2606 * Helper class for constructor reference lookup. The lookup logic is based
2607 * upon either Resolve.findMethod or Resolve.findDiamond - depending on
2608 * whether the constructor reference needs diamond inference (this is the case
2609 * if the qualifier type is raw). A special erroneous symbol is returned
2610 * if the lookup returns the constructor of an inner class and there's no
2611 * enclosing instance in scope.
2612 */
2613 class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
2615 boolean needsInference;
2617 ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
2618 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
2619 super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
2620 if (site.isRaw()) {
2621 this.site = new ClassType(site.getEnclosingType(), site.tsym.type.getTypeArguments(), site.tsym);
2622 needsInference = true;
2623 }
2624 }
2626 @Override
2627 protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
2628 Symbol sym = needsInference ?
2629 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
2630 findMethod(env, site, name, argtypes, typeargtypes,
2631 phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
2632 return sym.kind != MTH ||
2633 site.getEnclosingType().hasTag(NONE) ||
2634 hasEnclosingInstance(env, site) ?
2635 sym : new InvalidSymbolError(Kinds.MISSING_ENCL, sym, null) {
2636 @Override
2637 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
2638 return diags.create(dkind, log.currentSource(), pos,
2639 "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
2640 }
2641 };
2642 }
2644 @Override
2645 ReferenceKind referenceKind(Symbol sym) {
2646 return site.getEnclosingType().hasTag(NONE) ?
2647 ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
2648 }
2649 }
2651 /**
2652 * Main overload resolution routine. On each overload resolution step, a
2653 * lookup helper class is used to perform the method/constructor lookup;
2654 * at the end of the lookup, the helper is used to validate the results
2655 * (this last step might trigger overload resolution diagnostics).
2656 */
2657 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, LookupHelper lookupHelper) {
2658 return lookupMethod(env, pos, location, new MethodResolutionContext(), lookupHelper);
2659 }
2661 Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
2662 MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
2663 MethodResolutionContext prevResolutionContext = currentResolutionContext;
2664 try {
2665 Symbol bestSoFar = methodNotFound;
2666 currentResolutionContext = resolveContext;
2667 for (MethodResolutionPhase phase : methodResolutionSteps) {
2668 if (!phase.isApplicable(boxingEnabled, varargsEnabled) ||
2669 lookupHelper.shouldStop(bestSoFar, phase)) break;
2670 MethodResolutionPhase prevPhase = currentResolutionContext.step;
2671 Symbol prevBest = bestSoFar;
2672 currentResolutionContext.step = phase;
2673 bestSoFar = phase.mergeResults(bestSoFar, lookupHelper.lookup(env, phase));
2674 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
2675 }
2676 return lookupHelper.access(env, pos, location, bestSoFar);
2677 } finally {
2678 currentResolutionContext = prevResolutionContext;
2679 }
2680 }
2682 /**
2683 * Resolve `c.name' where name == this or name == super.
2684 * @param pos The position to use for error reporting.
2685 * @param env The environment current at the expression.
2686 * @param c The qualifier.
2687 * @param name The identifier's name.
2688 */
2689 Symbol resolveSelf(DiagnosticPosition pos,
2690 Env<AttrContext> env,
2691 TypeSymbol c,
2692 Name name) {
2693 Env<AttrContext> env1 = env;
2694 boolean staticOnly = false;
2695 while (env1.outer != null) {
2696 if (isStatic(env1)) staticOnly = true;
2697 if (env1.enclClass.sym == c) {
2698 Symbol sym = env1.info.scope.lookup(name).sym;
2699 if (sym != null) {
2700 if (staticOnly) sym = new StaticError(sym);
2701 return accessBase(sym, pos, env.enclClass.sym.type,
2702 name, true);
2703 }
2704 }
2705 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
2706 env1 = env1.outer;
2707 }
2708 if (allowDefaultMethods && c.isInterface() &&
2709 name == names._super && !isStatic(env) &&
2710 types.isDirectSuperInterface(c.type, env.enclClass.sym)) {
2711 //this might be a default super call if one of the superinterfaces is 'c'
2712 for (Type t : pruneInterfaces(env.enclClass.type)) {
2713 if (t.tsym == c) {
2714 env.info.defaultSuperCallSite = t;
2715 return new VarSymbol(0, names._super,
2716 types.asSuper(env.enclClass.type, c), env.enclClass.sym);
2717 }
2718 }
2719 //find a direct superinterface that is a subtype of 'c'
2720 for (Type i : types.interfaces(env.enclClass.type)) {
2721 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
2722 log.error(pos, "illegal.default.super.call", c,
2723 diags.fragment("redundant.supertype", c, i));
2724 return syms.errSymbol;
2725 }
2726 }
2727 Assert.error();
2728 }
2729 log.error(pos, "not.encl.class", c);
2730 return syms.errSymbol;
2731 }
2732 //where
2733 private List<Type> pruneInterfaces(Type t) {
2734 ListBuffer<Type> result = ListBuffer.lb();
2735 for (Type t1 : types.interfaces(t)) {
2736 boolean shouldAdd = true;
2737 for (Type t2 : types.interfaces(t)) {
2738 if (t1 != t2 && types.isSubtypeNoCapture(t2, t1)) {
2739 shouldAdd = false;
2740 }
2741 }
2742 if (shouldAdd) {
2743 result.append(t1);
2744 }
2745 }
2746 return result.toList();
2747 }
2750 /**
2751 * Resolve `c.this' for an enclosing class c that contains the
2752 * named member.
2753 * @param pos The position to use for error reporting.
2754 * @param env The environment current at the expression.
2755 * @param member The member that must be contained in the result.
2756 */
2757 Symbol resolveSelfContaining(DiagnosticPosition pos,
2758 Env<AttrContext> env,
2759 Symbol member,
2760 boolean isSuperCall) {
2761 Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
2762 if (sym == null) {
2763 log.error(pos, "encl.class.required", member);
2764 return syms.errSymbol;
2765 } else {
2766 return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
2767 }
2768 }
2770 boolean hasEnclosingInstance(Env<AttrContext> env, Type type) {
2771 Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
2772 return encl != null && encl.kind < ERRONEOUS;
2773 }
2775 private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
2776 Symbol member,
2777 boolean isSuperCall) {
2778 Name name = names._this;
2779 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
2780 boolean staticOnly = false;
2781 if (env1 != null) {
2782 while (env1 != null && env1.outer != null) {
2783 if (isStatic(env1)) staticOnly = true;
2784 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
2785 Symbol sym = env1.info.scope.lookup(name).sym;
2786 if (sym != null) {
2787 if (staticOnly) sym = new StaticError(sym);
2788 return sym;
2789 }
2790 }
2791 if ((env1.enclClass.sym.flags() & STATIC) != 0)
2792 staticOnly = true;
2793 env1 = env1.outer;
2794 }
2795 }
2796 return null;
2797 }
2799 /**
2800 * Resolve an appropriate implicit this instance for t's container.
2801 * JLS 8.8.5.1 and 15.9.2
2802 */
2803 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
2804 return resolveImplicitThis(pos, env, t, false);
2805 }
2807 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
2808 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
2809 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
2810 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
2811 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
2812 log.error(pos, "cant.ref.before.ctor.called", "this");
2813 return thisType;
2814 }
2816 /* ***************************************************************************
2817 * ResolveError classes, indicating error situations when accessing symbols
2818 ****************************************************************************/
2820 //used by TransTypes when checking target type of synthetic cast
2821 public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
2822 AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
2823 logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
2824 }
2825 //where
2826 private void logResolveError(ResolveError error,
2827 DiagnosticPosition pos,
2828 Symbol location,
2829 Type site,
2830 Name name,
2831 List<Type> argtypes,
2832 List<Type> typeargtypes) {
2833 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
2834 pos, location, site, name, argtypes, typeargtypes);
2835 if (d != null) {
2836 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
2837 log.report(d);
2838 }
2839 }
2841 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
2843 public Object methodArguments(List<Type> argtypes) {
2844 if (argtypes == null || argtypes.isEmpty()) {
2845 return noArgs;
2846 } else {
2847 ListBuffer<Object> diagArgs = ListBuffer.lb();
2848 for (Type t : argtypes) {
2849 if (t.hasTag(DEFERRED)) {
2850 diagArgs.append(((DeferredAttr.DeferredType)t).tree);
2851 } else {
2852 diagArgs.append(t);
2853 }
2854 }
2855 return diagArgs;
2856 }
2857 }
2859 /**
2860 * Root class for resolution errors. Subclass of ResolveError
2861 * represent a different kinds of resolution error - as such they must
2862 * specify how they map into concrete compiler diagnostics.
2863 */
2864 abstract class ResolveError extends Symbol {
2866 /** The name of the kind of error, for debugging only. */
2867 final String debugName;
2869 ResolveError(int kind, String debugName) {
2870 super(kind, 0, null, null, null);
2871 this.debugName = debugName;
2872 }
2874 @Override
2875 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
2876 throw new AssertionError();
2877 }
2879 @Override
2880 public String toString() {
2881 return debugName;
2882 }
2884 @Override
2885 public boolean exists() {
2886 return false;
2887 }
2889 /**
2890 * Create an external representation for this erroneous symbol to be
2891 * used during attribution - by default this returns the symbol of a
2892 * brand new error type which stores the original type found
2893 * during resolution.
2894 *
2895 * @param name the name used during resolution
2896 * @param location the location from which the symbol is accessed
2897 */
2898 protected Symbol access(Name name, TypeSymbol location) {
2899 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
2900 }
2902 /**
2903 * Create a diagnostic representing this resolution error.
2904 *
2905 * @param dkind The kind of the diagnostic to be created (e.g error).
2906 * @param pos The position to be used for error reporting.
2907 * @param site The original type from where the selection took place.
2908 * @param name The name of the symbol to be resolved.
2909 * @param argtypes The invocation's value arguments,
2910 * if we looked for a method.
2911 * @param typeargtypes The invocation's type arguments,
2912 * if we looked for a method.
2913 */
2914 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2915 DiagnosticPosition pos,
2916 Symbol location,
2917 Type site,
2918 Name name,
2919 List<Type> argtypes,
2920 List<Type> typeargtypes);
2921 }
2923 /**
2924 * This class is the root class of all resolution errors caused by
2925 * an invalid symbol being found during resolution.
2926 */
2927 abstract class InvalidSymbolError extends ResolveError {
2929 /** The invalid symbol found during resolution */
2930 Symbol sym;
2932 InvalidSymbolError(int kind, Symbol sym, String debugName) {
2933 super(kind, debugName);
2934 this.sym = sym;
2935 }
2937 @Override
2938 public boolean exists() {
2939 return true;
2940 }
2942 @Override
2943 public String toString() {
2944 return super.toString() + " wrongSym=" + sym;
2945 }
2947 @Override
2948 public Symbol access(Name name, TypeSymbol location) {
2949 if (sym.kind >= AMBIGUOUS)
2950 return ((ResolveError)sym).access(name, location);
2951 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
2952 return types.createErrorType(name, location, sym.type).tsym;
2953 else
2954 return sym;
2955 }
2956 }
2958 /**
2959 * InvalidSymbolError error class indicating that a symbol matching a
2960 * given name does not exists in a given site.
2961 */
2962 class SymbolNotFoundError extends ResolveError {
2964 SymbolNotFoundError(int kind) {
2965 super(kind, "symbol not found error");
2966 }
2968 @Override
2969 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2970 DiagnosticPosition pos,
2971 Symbol location,
2972 Type site,
2973 Name name,
2974 List<Type> argtypes,
2975 List<Type> typeargtypes) {
2976 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
2977 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
2978 if (name == names.error)
2979 return null;
2981 if (syms.operatorNames.contains(name)) {
2982 boolean isUnaryOp = argtypes.size() == 1;
2983 String key = argtypes.size() == 1 ?
2984 "operator.cant.be.applied" :
2985 "operator.cant.be.applied.1";
2986 Type first = argtypes.head;
2987 Type second = !isUnaryOp ? argtypes.tail.head : null;
2988 return diags.create(dkind, log.currentSource(), pos,
2989 key, name, first, second);
2990 }
2991 boolean hasLocation = false;
2992 if (location == null) {
2993 location = site.tsym;
2994 }
2995 if (!location.name.isEmpty()) {
2996 if (location.kind == PCK && !site.tsym.exists()) {
2997 return diags.create(dkind, log.currentSource(), pos,
2998 "doesnt.exist", location);
2999 }
3000 hasLocation = !location.name.equals(names._this) &&
3001 !location.name.equals(names._super);
3002 }
3003 boolean isConstructor = kind == ABSENT_MTH && name == names.init;
3004 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
3005 Name idname = isConstructor ? site.tsym.name : name;
3006 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
3007 if (hasLocation) {
3008 return diags.create(dkind, log.currentSource(), pos,
3009 errKey, kindname, idname, //symbol kindname, name
3010 typeargtypes, argtypes, //type parameters and arguments (if any)
3011 getLocationDiag(location, site)); //location kindname, type
3012 }
3013 else {
3014 return diags.create(dkind, log.currentSource(), pos,
3015 errKey, kindname, idname, //symbol kindname, name
3016 typeargtypes, argtypes); //type parameters and arguments (if any)
3017 }
3018 }
3019 //where
3020 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
3021 String key = "cant.resolve";
3022 String suffix = hasLocation ? ".location" : "";
3023 switch (kindname) {
3024 case METHOD:
3025 case CONSTRUCTOR: {
3026 suffix += ".args";
3027 suffix += hasTypeArgs ? ".params" : "";
3028 }
3029 }
3030 return key + suffix;
3031 }
3032 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
3033 if (location.kind == VAR) {
3034 return diags.fragment("location.1",
3035 kindName(location),
3036 location,
3037 location.type);
3038 } else {
3039 return diags.fragment("location",
3040 typeKindName(site),
3041 site,
3042 null);
3043 }
3044 }
3045 }
3047 /**
3048 * InvalidSymbolError error class indicating that a given symbol
3049 * (either a method, a constructor or an operand) is not applicable
3050 * given an actual arguments/type argument list.
3051 */
3052 class InapplicableSymbolError extends ResolveError {
3054 protected MethodResolutionContext resolveContext;
3056 InapplicableSymbolError(MethodResolutionContext context) {
3057 this(WRONG_MTH, "inapplicable symbol error", context);
3058 }
3060 protected InapplicableSymbolError(int kind, String debugName, MethodResolutionContext context) {
3061 super(kind, debugName);
3062 this.resolveContext = context;
3063 }
3065 @Override
3066 public String toString() {
3067 return super.toString();
3068 }
3070 @Override
3071 public boolean exists() {
3072 return true;
3073 }
3075 @Override
3076 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3077 DiagnosticPosition pos,
3078 Symbol location,
3079 Type site,
3080 Name name,
3081 List<Type> argtypes,
3082 List<Type> typeargtypes) {
3083 if (name == names.error)
3084 return null;
3086 if (syms.operatorNames.contains(name)) {
3087 boolean isUnaryOp = argtypes.size() == 1;
3088 String key = argtypes.size() == 1 ?
3089 "operator.cant.be.applied" :
3090 "operator.cant.be.applied.1";
3091 Type first = argtypes.head;
3092 Type second = !isUnaryOp ? argtypes.tail.head : null;
3093 return diags.create(dkind, log.currentSource(), pos,
3094 key, name, first, second);
3095 }
3096 else {
3097 Candidate c = errCandidate();
3098 Symbol ws = c.sym.asMemberOf(site, types);
3099 return diags.create(dkind, log.currentSource(), pos,
3100 "cant.apply.symbol",
3101 kindName(ws),
3102 ws.name == names.init ? ws.owner.name : ws.name,
3103 methodArguments(ws.type.getParameterTypes()),
3104 methodArguments(argtypes),
3105 kindName(ws.owner),
3106 ws.owner.type,
3107 c.details);
3108 }
3109 }
3111 @Override
3112 public Symbol access(Name name, TypeSymbol location) {
3113 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
3114 }
3116 private Candidate errCandidate() {
3117 Candidate bestSoFar = null;
3118 for (Candidate c : resolveContext.candidates) {
3119 if (c.isApplicable()) continue;
3120 bestSoFar = c;
3121 }
3122 Assert.checkNonNull(bestSoFar);
3123 return bestSoFar;
3124 }
3125 }
3127 /**
3128 * ResolveError error class indicating that a set of symbols
3129 * (either methods, constructors or operands) is not applicable
3130 * given an actual arguments/type argument list.
3131 */
3132 class InapplicableSymbolsError extends InapplicableSymbolError {
3134 InapplicableSymbolsError(MethodResolutionContext context) {
3135 super(WRONG_MTHS, "inapplicable symbols", context);
3136 }
3138 @Override
3139 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3140 DiagnosticPosition pos,
3141 Symbol location,
3142 Type site,
3143 Name name,
3144 List<Type> argtypes,
3145 List<Type> typeargtypes) {
3146 if (!resolveContext.candidates.isEmpty()) {
3147 JCDiagnostic err = diags.create(dkind,
3148 log.currentSource(),
3149 pos,
3150 "cant.apply.symbols",
3151 name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
3152 name == names.init ? site.tsym.name : name,
3153 argtypes);
3154 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(site));
3155 } else {
3156 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
3157 location, site, name, argtypes, typeargtypes);
3158 }
3159 }
3161 //where
3162 List<JCDiagnostic> candidateDetails(Type site) {
3163 Map<Symbol, JCDiagnostic> details = new LinkedHashMap<Symbol, JCDiagnostic>();
3164 for (Candidate c : resolveContext.candidates) {
3165 if (c.isApplicable()) continue;
3166 JCDiagnostic detailDiag = diags.fragment("inapplicable.method",
3167 Kinds.kindName(c.sym),
3168 c.sym.location(site, types),
3169 c.sym.asMemberOf(site, types),
3170 c.details);
3171 details.put(c.sym, detailDiag);
3172 }
3173 return List.from(details.values());
3174 }
3175 }
3177 /**
3178 * An InvalidSymbolError error class indicating that a symbol is not
3179 * accessible from a given site
3180 */
3181 class AccessError extends InvalidSymbolError {
3183 private Env<AttrContext> env;
3184 private Type site;
3186 AccessError(Symbol sym) {
3187 this(null, null, sym);
3188 }
3190 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
3191 super(HIDDEN, sym, "access error");
3192 this.env = env;
3193 this.site = site;
3194 if (debugResolve)
3195 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
3196 }
3198 @Override
3199 public boolean exists() {
3200 return false;
3201 }
3203 @Override
3204 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3205 DiagnosticPosition pos,
3206 Symbol location,
3207 Type site,
3208 Name name,
3209 List<Type> argtypes,
3210 List<Type> typeargtypes) {
3211 if (sym.owner.type.hasTag(ERROR))
3212 return null;
3214 if (sym.name == names.init && sym.owner != site.tsym) {
3215 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
3216 pos, location, site, name, argtypes, typeargtypes);
3217 }
3218 else if ((sym.flags() & PUBLIC) != 0
3219 || (env != null && this.site != null
3220 && !isAccessible(env, this.site))) {
3221 return diags.create(dkind, log.currentSource(),
3222 pos, "not.def.access.class.intf.cant.access",
3223 sym, sym.location());
3224 }
3225 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
3226 return diags.create(dkind, log.currentSource(),
3227 pos, "report.access", sym,
3228 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
3229 sym.location());
3230 }
3231 else {
3232 return diags.create(dkind, log.currentSource(),
3233 pos, "not.def.public.cant.access", sym, sym.location());
3234 }
3235 }
3236 }
3238 /**
3239 * InvalidSymbolError error class indicating that an instance member
3240 * has erroneously been accessed from a static context.
3241 */
3242 class StaticError extends InvalidSymbolError {
3244 StaticError(Symbol sym) {
3245 super(STATICERR, sym, "static error");
3246 }
3248 @Override
3249 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3250 DiagnosticPosition pos,
3251 Symbol location,
3252 Type site,
3253 Name name,
3254 List<Type> argtypes,
3255 List<Type> typeargtypes) {
3256 Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
3257 ? types.erasure(sym.type).tsym
3258 : sym);
3259 return diags.create(dkind, log.currentSource(), pos,
3260 "non-static.cant.be.ref", kindName(sym), errSym);
3261 }
3262 }
3264 /**
3265 * InvalidSymbolError error class indicating that a pair of symbols
3266 * (either methods, constructors or operands) are ambiguous
3267 * given an actual arguments/type argument list.
3268 */
3269 class AmbiguityError extends InvalidSymbolError {
3271 /** The other maximally specific symbol */
3272 Symbol sym2;
3274 AmbiguityError(Symbol sym1, Symbol sym2) {
3275 super(AMBIGUOUS, sym1, "ambiguity error");
3276 this.sym2 = sym2;
3277 }
3279 @Override
3280 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
3281 DiagnosticPosition pos,
3282 Symbol location,
3283 Type site,
3284 Name name,
3285 List<Type> argtypes,
3286 List<Type> typeargtypes) {
3287 AmbiguityError pair = this;
3288 while (true) {
3289 if (pair.sym.kind == AMBIGUOUS)
3290 pair = (AmbiguityError)pair.sym;
3291 else if (pair.sym2.kind == AMBIGUOUS)
3292 pair = (AmbiguityError)pair.sym2;
3293 else break;
3294 }
3295 Name sname = pair.sym.name;
3296 if (sname == names.init) sname = pair.sym.owner.name;
3297 return diags.create(dkind, log.currentSource(),
3298 pos, "ref.ambiguous", sname,
3299 kindName(pair.sym),
3300 pair.sym,
3301 pair.sym.location(site, types),
3302 kindName(pair.sym2),
3303 pair.sym2,
3304 pair.sym2.location(site, types));
3305 }
3306 }
3308 enum MethodResolutionPhase {
3309 BASIC(false, false),
3310 BOX(true, false),
3311 VARARITY(true, true) {
3312 @Override
3313 public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
3314 switch (sym.kind) {
3315 case WRONG_MTH:
3316 return (bestSoFar.kind == WRONG_MTH || bestSoFar.kind == WRONG_MTHS) ?
3317 bestSoFar :
3318 sym;
3319 case ABSENT_MTH:
3320 return bestSoFar;
3321 default:
3322 return sym;
3323 }
3324 }
3325 };
3327 boolean isBoxingRequired;
3328 boolean isVarargsRequired;
3330 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
3331 this.isBoxingRequired = isBoxingRequired;
3332 this.isVarargsRequired = isVarargsRequired;
3333 }
3335 public boolean isBoxingRequired() {
3336 return isBoxingRequired;
3337 }
3339 public boolean isVarargsRequired() {
3340 return isVarargsRequired;
3341 }
3343 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
3344 return (varargsEnabled || !isVarargsRequired) &&
3345 (boxingEnabled || !isBoxingRequired);
3346 }
3348 public Symbol mergeResults(Symbol prev, Symbol sym) {
3349 return sym;
3350 }
3351 }
3353 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
3355 /**
3356 * A resolution context is used to keep track of intermediate results of
3357 * overload resolution, such as list of method that are not applicable
3358 * (used to generate more precise diagnostics) and so on. Resolution contexts
3359 * can be nested - this means that when each overload resolution routine should
3360 * work within the resolution context it created.
3361 */
3362 class MethodResolutionContext {
3364 private List<Candidate> candidates = List.nil();
3366 MethodResolutionPhase step = null;
3368 private boolean internalResolution = false;
3369 private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
3371 void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
3372 Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
3373 candidates = candidates.append(c);
3374 }
3376 void addApplicableCandidate(Symbol sym, Type mtype) {
3377 Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
3378 candidates = candidates.append(c);
3379 }
3381 /**
3382 * This class represents an overload resolution candidate. There are two
3383 * kinds of candidates: applicable methods and inapplicable methods;
3384 * applicable methods have a pointer to the instantiated method type,
3385 * while inapplicable candidates contain further details about the
3386 * reason why the method has been considered inapplicable.
3387 */
3388 class Candidate {
3390 final MethodResolutionPhase step;
3391 final Symbol sym;
3392 final JCDiagnostic details;
3393 final Type mtype;
3395 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
3396 this.step = step;
3397 this.sym = sym;
3398 this.details = details;
3399 this.mtype = mtype;
3400 }
3402 @Override
3403 public boolean equals(Object o) {
3404 if (o instanceof Candidate) {
3405 Symbol s1 = this.sym;
3406 Symbol s2 = ((Candidate)o).sym;
3407 if ((s1 != s2 &&
3408 (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
3409 (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
3410 ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
3411 return true;
3412 }
3413 return false;
3414 }
3416 boolean isApplicable() {
3417 return mtype != null;
3418 }
3419 }
3421 DeferredAttr.AttrMode attrMode() {
3422 return attrMode;
3423 }
3425 boolean internal() {
3426 return internalResolution;
3427 }
3428 }
3430 MethodResolutionContext currentResolutionContext = null;
3431 }
