Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Resolve.java@51fb17abfc32
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Tue, 24 Jan 2012 17:52:02 +0000
- author
- mcimadamore
- date
- Tue, 24 Jan 2012 17:52:02 +0000
- changeset 1186
- 51fb17abfc32
- parent 1127
- ca49d50318dc
- child 1215
- 161230ec7c73
- permissions
- -rw-r--r--
7129801: Merge the two method applicability routines
Summary: Resolve.java and Infer.java should reuse the same method applicability check routine
Reviewed-by: dlsmith, 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.Type.*;
31 import com.sun.tools.javac.code.Symbol.*;
32 import com.sun.tools.javac.jvm.*;
33 import com.sun.tools.javac.tree.*;
34 import com.sun.tools.javac.tree.JCTree.*;
35 import com.sun.tools.javac.util.*;
36 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
37 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
38 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
40 import java.util.Arrays;
41 import java.util.Collection;
42 import java.util.EnumSet;
43 import java.util.HashMap;
44 import java.util.HashSet;
45 import java.util.LinkedHashMap;
46 import java.util.Map;
47 import java.util.Set;
49 import javax.lang.model.element.ElementVisitor;
51 import static com.sun.tools.javac.code.Flags.*;
52 import static com.sun.tools.javac.code.Flags.BLOCK;
53 import static com.sun.tools.javac.code.Kinds.*;
54 import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
55 import static com.sun.tools.javac.code.TypeTags.*;
56 import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
57 import static com.sun.tools.javac.tree.JCTree.Tag.*;
59 /** Helper class for name resolution, used mostly by the attribution phase.
60 *
61 * <p><b>This is NOT part of any supported API.
62 * If you write code that depends on this, you do so at your own risk.
63 * This code and its internal interfaces are subject to change or
64 * deletion without notice.</b>
65 */
66 public class Resolve {
67 protected static final Context.Key<Resolve> resolveKey =
68 new Context.Key<Resolve>();
70 Names names;
71 Log log;
72 Symtab syms;
73 Check chk;
74 Infer infer;
75 ClassReader reader;
76 TreeInfo treeinfo;
77 Types types;
78 JCDiagnostic.Factory diags;
79 public final boolean boxingEnabled; // = source.allowBoxing();
80 public final boolean varargsEnabled; // = source.allowVarargs();
81 public final boolean allowMethodHandles;
82 private final boolean debugResolve;
83 final EnumSet<VerboseResolutionMode> verboseResolutionMode;
85 Scope polymorphicSignatureScope;
87 enum VerboseResolutionMode {
88 SUCCESS("success"),
89 FAILURE("failure"),
90 APPLICABLE("applicable"),
91 INAPPLICABLE("inapplicable"),
92 DEFERRED_INST("deferred-inference"),
93 PREDEF("predef"),
94 OBJECT_INIT("object-init"),
95 INTERNAL("internal");
97 String opt;
99 private VerboseResolutionMode(String opt) {
100 this.opt = opt;
101 }
103 static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
104 String s = opts.get("verboseResolution");
105 EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
106 if (s == null) return res;
107 if (s.contains("all")) {
108 res = EnumSet.allOf(VerboseResolutionMode.class);
109 }
110 Collection<String> args = Arrays.asList(s.split(","));
111 for (VerboseResolutionMode mode : values()) {
112 if (args.contains(mode.opt)) {
113 res.add(mode);
114 } else if (args.contains("-" + mode.opt)) {
115 res.remove(mode);
116 }
117 }
118 return res;
119 }
120 }
122 public static Resolve instance(Context context) {
123 Resolve instance = context.get(resolveKey);
124 if (instance == null)
125 instance = new Resolve(context);
126 return instance;
127 }
129 protected Resolve(Context context) {
130 context.put(resolveKey, this);
131 syms = Symtab.instance(context);
133 varNotFound = new
134 SymbolNotFoundError(ABSENT_VAR);
135 wrongMethod = new
136 InapplicableSymbolError(syms.errSymbol);
137 wrongMethods = new
138 InapplicableSymbolsError(syms.errSymbol);
139 methodNotFound = new
140 SymbolNotFoundError(ABSENT_MTH);
141 typeNotFound = new
142 SymbolNotFoundError(ABSENT_TYP);
144 names = Names.instance(context);
145 log = Log.instance(context);
146 chk = Check.instance(context);
147 infer = Infer.instance(context);
148 reader = ClassReader.instance(context);
149 treeinfo = TreeInfo.instance(context);
150 types = Types.instance(context);
151 diags = JCDiagnostic.Factory.instance(context);
152 Source source = Source.instance(context);
153 boxingEnabled = source.allowBoxing();
154 varargsEnabled = source.allowVarargs();
155 Options options = Options.instance(context);
156 debugResolve = options.isSet("debugresolve");
157 verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
158 Target target = Target.instance(context);
159 allowMethodHandles = target.hasMethodHandles();
160 polymorphicSignatureScope = new Scope(syms.noSymbol);
162 inapplicableMethodException = new InapplicableMethodException(diags);
163 }
165 /** error symbols, which are returned when resolution fails
166 */
167 final SymbolNotFoundError varNotFound;
168 final InapplicableSymbolError wrongMethod;
169 final InapplicableSymbolsError wrongMethods;
170 final SymbolNotFoundError methodNotFound;
171 final SymbolNotFoundError typeNotFound;
173 /* ************************************************************************
174 * Identifier resolution
175 *************************************************************************/
177 /** An environment is "static" if its static level is greater than
178 * the one of its outer environment
179 */
180 static boolean isStatic(Env<AttrContext> env) {
181 return env.info.staticLevel > env.outer.info.staticLevel;
182 }
184 /** An environment is an "initializer" if it is a constructor or
185 * an instance initializer.
186 */
187 static boolean isInitializer(Env<AttrContext> env) {
188 Symbol owner = env.info.scope.owner;
189 return owner.isConstructor() ||
190 owner.owner.kind == TYP &&
191 (owner.kind == VAR ||
192 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
193 (owner.flags() & STATIC) == 0;
194 }
196 /** Is class accessible in given evironment?
197 * @param env The current environment.
198 * @param c The class whose accessibility is checked.
199 */
200 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
201 return isAccessible(env, c, false);
202 }
204 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
205 boolean isAccessible = false;
206 switch ((short)(c.flags() & AccessFlags)) {
207 case PRIVATE:
208 isAccessible =
209 env.enclClass.sym.outermostClass() ==
210 c.owner.outermostClass();
211 break;
212 case 0:
213 isAccessible =
214 env.toplevel.packge == c.owner // fast special case
215 ||
216 env.toplevel.packge == c.packge()
217 ||
218 // Hack: this case is added since synthesized default constructors
219 // of anonymous classes should be allowed to access
220 // classes which would be inaccessible otherwise.
221 env.enclMethod != null &&
222 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
223 break;
224 default: // error recovery
225 case PUBLIC:
226 isAccessible = true;
227 break;
228 case PROTECTED:
229 isAccessible =
230 env.toplevel.packge == c.owner // fast special case
231 ||
232 env.toplevel.packge == c.packge()
233 ||
234 isInnerSubClass(env.enclClass.sym, c.owner);
235 break;
236 }
237 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
238 isAccessible :
239 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
240 }
241 //where
242 /** Is given class a subclass of given base class, or an inner class
243 * of a subclass?
244 * Return null if no such class exists.
245 * @param c The class which is the subclass or is contained in it.
246 * @param base The base class
247 */
248 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
249 while (c != null && !c.isSubClass(base, types)) {
250 c = c.owner.enclClass();
251 }
252 return c != null;
253 }
255 boolean isAccessible(Env<AttrContext> env, Type t) {
256 return isAccessible(env, t, false);
257 }
259 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
260 return (t.tag == ARRAY)
261 ? isAccessible(env, types.elemtype(t))
262 : isAccessible(env, t.tsym, checkInner);
263 }
265 /** Is symbol accessible as a member of given type in given evironment?
266 * @param env The current environment.
267 * @param site The type of which the tested symbol is regarded
268 * as a member.
269 * @param sym The symbol.
270 */
271 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
272 return isAccessible(env, site, sym, false);
273 }
274 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
275 if (sym.name == names.init && sym.owner != site.tsym) return false;
276 switch ((short)(sym.flags() & AccessFlags)) {
277 case PRIVATE:
278 return
279 (env.enclClass.sym == sym.owner // fast special case
280 ||
281 env.enclClass.sym.outermostClass() ==
282 sym.owner.outermostClass())
283 &&
284 sym.isInheritedIn(site.tsym, types);
285 case 0:
286 return
287 (env.toplevel.packge == sym.owner.owner // fast special case
288 ||
289 env.toplevel.packge == sym.packge())
290 &&
291 isAccessible(env, site, checkInner)
292 &&
293 sym.isInheritedIn(site.tsym, types)
294 &&
295 notOverriddenIn(site, sym);
296 case PROTECTED:
297 return
298 (env.toplevel.packge == sym.owner.owner // fast special case
299 ||
300 env.toplevel.packge == sym.packge()
301 ||
302 isProtectedAccessible(sym, env.enclClass.sym, site)
303 ||
304 // OK to select instance method or field from 'super' or type name
305 // (but type names should be disallowed elsewhere!)
306 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
307 &&
308 isAccessible(env, site, checkInner)
309 &&
310 notOverriddenIn(site, sym);
311 default: // this case includes erroneous combinations as well
312 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
313 }
314 }
315 //where
316 /* `sym' is accessible only if not overridden by
317 * another symbol which is a member of `site'
318 * (because, if it is overridden, `sym' is not strictly
319 * speaking a member of `site'). A polymorphic signature method
320 * cannot be overridden (e.g. MH.invokeExact(Object[])).
321 */
322 private boolean notOverriddenIn(Type site, Symbol sym) {
323 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
324 return true;
325 else {
326 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
327 return (s2 == null || s2 == sym || sym.owner == s2.owner ||
328 s2.isPolymorphicSignatureGeneric() ||
329 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
330 }
331 }
332 //where
333 /** Is given protected symbol accessible if it is selected from given site
334 * and the selection takes place in given class?
335 * @param sym The symbol with protected access
336 * @param c The class where the access takes place
337 * @site The type of the qualifier
338 */
339 private
340 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
341 while (c != null &&
342 !(c.isSubClass(sym.owner, types) &&
343 (c.flags() & INTERFACE) == 0 &&
344 // In JLS 2e 6.6.2.1, the subclass restriction applies
345 // only to instance fields and methods -- types are excluded
346 // regardless of whether they are declared 'static' or not.
347 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
348 c = c.owner.enclClass();
349 return c != null;
350 }
352 /** Try to instantiate the type of a method so that it fits
353 * given type arguments and argument types. If succesful, return
354 * the method's instantiated type, else return null.
355 * The instantiation will take into account an additional leading
356 * formal parameter if the method is an instance method seen as a member
357 * of un underdetermined site In this case, we treat site as an additional
358 * parameter and the parameters of the class containing the method as
359 * additional type variables that get instantiated.
360 *
361 * @param env The current environment
362 * @param site The type of which the method is a member.
363 * @param m The method symbol.
364 * @param argtypes The invocation's given value arguments.
365 * @param typeargtypes The invocation's given type arguments.
366 * @param allowBoxing Allow boxing conversions of arguments.
367 * @param useVarargs Box trailing arguments into an array for varargs.
368 */
369 Type rawInstantiate(Env<AttrContext> env,
370 Type site,
371 Symbol m,
372 List<Type> argtypes,
373 List<Type> typeargtypes,
374 boolean allowBoxing,
375 boolean useVarargs,
376 Warner warn)
377 throws Infer.InferenceException {
378 boolean polymorphicSignature = m.isPolymorphicSignatureGeneric() && allowMethodHandles;
379 if (useVarargs && (m.flags() & VARARGS) == 0)
380 throw inapplicableMethodException.setMessage();
381 Type mt = types.memberType(site, m);
383 // tvars is the list of formal type variables for which type arguments
384 // need to inferred.
385 List<Type> tvars = null;
386 if (env.info.tvars != null) {
387 tvars = types.newInstances(env.info.tvars);
388 mt = types.subst(mt, env.info.tvars, tvars);
389 }
390 if (typeargtypes == null) typeargtypes = List.nil();
391 if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
392 // This is not a polymorphic method, but typeargs are supplied
393 // which is fine, see JLS 15.12.2.1
394 } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
395 ForAll pmt = (ForAll) mt;
396 if (typeargtypes.length() != pmt.tvars.length())
397 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
398 // Check type arguments are within bounds
399 List<Type> formals = pmt.tvars;
400 List<Type> actuals = typeargtypes;
401 while (formals.nonEmpty() && actuals.nonEmpty()) {
402 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
403 pmt.tvars, typeargtypes);
404 for (; bounds.nonEmpty(); bounds = bounds.tail)
405 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
406 throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
407 formals = formals.tail;
408 actuals = actuals.tail;
409 }
410 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
411 } else if (mt.tag == FORALL) {
412 ForAll pmt = (ForAll) mt;
413 List<Type> tvars1 = types.newInstances(pmt.tvars);
414 tvars = tvars.appendList(tvars1);
415 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
416 }
418 // find out whether we need to go the slow route via infer
419 boolean instNeeded = tvars.tail != null || /*inlined: tvars.nonEmpty()*/
420 polymorphicSignature;
421 for (List<Type> l = argtypes;
422 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
423 l = l.tail) {
424 if (l.head.tag == FORALL) instNeeded = true;
425 }
427 if (instNeeded)
428 return polymorphicSignature ?
429 infer.instantiatePolymorphicSignatureInstance(env, site, m.name, (MethodSymbol)m, argtypes) :
430 infer.instantiateMethod(env,
431 tvars,
432 (MethodType)mt,
433 m,
434 argtypes,
435 allowBoxing,
436 useVarargs,
437 warn);
439 checkRawArgumentsAcceptable(env, argtypes, mt.getParameterTypes(),
440 allowBoxing, useVarargs, warn);
441 return mt;
442 }
444 /** Same but returns null instead throwing a NoInstanceException
445 */
446 Type instantiate(Env<AttrContext> env,
447 Type site,
448 Symbol m,
449 List<Type> argtypes,
450 List<Type> typeargtypes,
451 boolean allowBoxing,
452 boolean useVarargs,
453 Warner warn) {
454 try {
455 return rawInstantiate(env, site, m, argtypes, typeargtypes,
456 allowBoxing, useVarargs, warn);
457 } catch (InapplicableMethodException ex) {
458 return null;
459 }
460 }
462 /** Check if a parameter list accepts a list of args.
463 */
464 boolean argumentsAcceptable(Env<AttrContext> env,
465 List<Type> argtypes,
466 List<Type> formals,
467 boolean allowBoxing,
468 boolean useVarargs,
469 Warner warn) {
470 try {
471 checkRawArgumentsAcceptable(env, argtypes, formals, allowBoxing, useVarargs, warn);
472 return true;
473 } catch (InapplicableMethodException ex) {
474 return false;
475 }
476 }
477 /**
478 * A check handler is used by the main method applicability routine in order
479 * to handle specific method applicability failures. It is assumed that a class
480 * implementing this interface should throw exceptions that are a subtype of
481 * InapplicableMethodException (see below). Such exception will terminate the
482 * method applicability check and propagate important info outwards (for the
483 * purpose of generating better diagnostics).
484 */
485 interface MethodCheckHandler {
486 /* The number of actuals and formals differ */
487 InapplicableMethodException arityMismatch();
488 /* An actual argument type does not conform to the corresponding formal type */
489 InapplicableMethodException argumentMismatch(boolean varargs, Type found, Type expected);
490 /* The element type of a varargs is not accessible in the current context */
491 InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected);
492 }
494 /**
495 * Basic method check handler used within Resolve - all methods end up
496 * throwing InapplicableMethodException; a diagnostic fragment that describes
497 * the cause as to why the method is not applicable is set on the exception
498 * before it is thrown.
499 */
500 MethodCheckHandler resolveHandler = new MethodCheckHandler() {
501 public InapplicableMethodException arityMismatch() {
502 return inapplicableMethodException.setMessage("arg.length.mismatch");
503 }
504 public InapplicableMethodException argumentMismatch(boolean varargs, Type found, Type expected) {
505 String key = varargs ?
506 "varargs.argument.mismatch" :
507 "no.conforming.assignment.exists";
508 return inapplicableMethodException.setMessage(key,
509 found, expected);
510 }
511 public InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected) {
512 return inapplicableMethodException.setMessage("inaccessible.varargs.type",
513 expected, Kinds.kindName(location), location);
514 }
515 };
517 void checkRawArgumentsAcceptable(Env<AttrContext> env,
518 List<Type> argtypes,
519 List<Type> formals,
520 boolean allowBoxing,
521 boolean useVarargs,
522 Warner warn) {
523 checkRawArgumentsAcceptable(env, List.<Type>nil(), argtypes, formals,
524 allowBoxing, useVarargs, warn, resolveHandler);
525 }
527 /**
528 * Main method applicability routine. Given a list of actual types A,
529 * a list of formal types F, determines whether the types in A are
530 * compatible (by method invocation conversion) with the types in F.
531 *
532 * Since this routine is shared between overload resolution and method
533 * type-inference, it is crucial that actual types are converted to the
534 * corresponding 'undet' form (i.e. where inference variables are replaced
535 * with undetvars) so that constraints can be propagated and collected.
536 *
537 * Moreover, if one or more types in A is a poly type, this routine calls
538 * Infer.instantiateArg in order to complete the poly type (this might involve
539 * deferred attribution).
540 *
541 * A method check handler (see above) is used in order to report errors.
542 */
543 List<Type> checkRawArgumentsAcceptable(Env<AttrContext> env,
544 List<Type> undetvars,
545 List<Type> argtypes,
546 List<Type> formals,
547 boolean allowBoxing,
548 boolean useVarargs,
549 Warner warn,
550 MethodCheckHandler handler) {
551 Type varargsFormal = useVarargs ? formals.last() : null;
552 ListBuffer<Type> checkedArgs = ListBuffer.lb();
554 if (varargsFormal == null &&
555 argtypes.size() != formals.size()) {
556 throw handler.arityMismatch(); // not enough args
557 }
559 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
560 Type undetFormal = infer.asUndetType(formals.head, undetvars);
561 Type capturedActual = types.capture(argtypes.head);
562 boolean works = allowBoxing ?
563 types.isConvertible(capturedActual, undetFormal, warn) :
564 types.isSubtypeUnchecked(capturedActual, undetFormal, warn);
565 if (!works) {
566 throw handler.argumentMismatch(false, argtypes.head, formals.head);
567 }
568 checkedArgs.append(capturedActual);
569 argtypes = argtypes.tail;
570 formals = formals.tail;
571 }
573 if (formals.head != varargsFormal) {
574 throw handler.arityMismatch(); // not enough args
575 }
577 if (useVarargs) {
578 //note: if applicability check is triggered by most specific test,
579 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
580 Type elt = types.elemtype(varargsFormal);
581 Type eltUndet = infer.asUndetType(elt, undetvars);
582 while (argtypes.nonEmpty()) {
583 Type capturedActual = types.capture(argtypes.head);
584 if (!types.isConvertible(capturedActual, eltUndet, warn)) {
585 throw handler.argumentMismatch(true, argtypes.head, elt);
586 }
587 checkedArgs.append(capturedActual);
588 argtypes = argtypes.tail;
589 }
590 //check varargs element type accessibility
591 if (undetvars.isEmpty() && !isAccessible(env, elt)) {
592 Symbol location = env.enclClass.sym;
593 throw handler.inaccessibleVarargs(location, elt);
594 }
595 }
596 return checkedArgs.toList();
597 }
598 // where
599 public static class InapplicableMethodException extends RuntimeException {
600 private static final long serialVersionUID = 0;
602 JCDiagnostic diagnostic;
603 JCDiagnostic.Factory diags;
605 InapplicableMethodException(JCDiagnostic.Factory diags) {
606 this.diagnostic = null;
607 this.diags = diags;
608 }
609 InapplicableMethodException setMessage() {
610 this.diagnostic = null;
611 return this;
612 }
613 InapplicableMethodException setMessage(String key) {
614 this.diagnostic = key != null ? diags.fragment(key) : null;
615 return this;
616 }
617 InapplicableMethodException setMessage(String key, Object... args) {
618 this.diagnostic = key != null ? diags.fragment(key, args) : null;
619 return this;
620 }
621 InapplicableMethodException setMessage(JCDiagnostic diag) {
622 this.diagnostic = diag;
623 return this;
624 }
626 public JCDiagnostic getDiagnostic() {
627 return diagnostic;
628 }
629 }
630 private final InapplicableMethodException inapplicableMethodException;
632 /* ***************************************************************************
633 * Symbol lookup
634 * the following naming conventions for arguments are used
635 *
636 * env is the environment where the symbol was mentioned
637 * site is the type of which the symbol is a member
638 * name is the symbol's name
639 * if no arguments are given
640 * argtypes are the value arguments, if we search for a method
641 *
642 * If no symbol was found, a ResolveError detailing the problem is returned.
643 ****************************************************************************/
645 /** Find field. Synthetic fields are always skipped.
646 * @param env The current environment.
647 * @param site The original type from where the selection takes place.
648 * @param name The name of the field.
649 * @param c The class to search for the field. This is always
650 * a superclass or implemented interface of site's class.
651 */
652 Symbol findField(Env<AttrContext> env,
653 Type site,
654 Name name,
655 TypeSymbol c) {
656 while (c.type.tag == TYPEVAR)
657 c = c.type.getUpperBound().tsym;
658 Symbol bestSoFar = varNotFound;
659 Symbol sym;
660 Scope.Entry e = c.members().lookup(name);
661 while (e.scope != null) {
662 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
663 return isAccessible(env, site, e.sym)
664 ? e.sym : new AccessError(env, site, e.sym);
665 }
666 e = e.next();
667 }
668 Type st = types.supertype(c.type);
669 if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
670 sym = findField(env, site, name, st.tsym);
671 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
672 }
673 for (List<Type> l = types.interfaces(c.type);
674 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
675 l = l.tail) {
676 sym = findField(env, site, name, l.head.tsym);
677 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
678 sym.owner != bestSoFar.owner)
679 bestSoFar = new AmbiguityError(bestSoFar, sym);
680 else if (sym.kind < bestSoFar.kind)
681 bestSoFar = sym;
682 }
683 return bestSoFar;
684 }
686 /** Resolve a field identifier, throw a fatal error if not found.
687 * @param pos The position to use for error reporting.
688 * @param env The environment current at the method invocation.
689 * @param site The type of the qualifying expression, in which
690 * identifier is searched.
691 * @param name The identifier's name.
692 */
693 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
694 Type site, Name name) {
695 Symbol sym = findField(env, site, name, site.tsym);
696 if (sym.kind == VAR) return (VarSymbol)sym;
697 else throw new FatalError(
698 diags.fragment("fatal.err.cant.locate.field",
699 name));
700 }
702 /** Find unqualified variable or field with given name.
703 * Synthetic fields always skipped.
704 * @param env The current environment.
705 * @param name The name of the variable or field.
706 */
707 Symbol findVar(Env<AttrContext> env, Name name) {
708 Symbol bestSoFar = varNotFound;
709 Symbol sym;
710 Env<AttrContext> env1 = env;
711 boolean staticOnly = false;
712 while (env1.outer != null) {
713 if (isStatic(env1)) staticOnly = true;
714 Scope.Entry e = env1.info.scope.lookup(name);
715 while (e.scope != null &&
716 (e.sym.kind != VAR ||
717 (e.sym.flags_field & SYNTHETIC) != 0))
718 e = e.next();
719 sym = (e.scope != null)
720 ? e.sym
721 : findField(
722 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
723 if (sym.exists()) {
724 if (staticOnly &&
725 sym.kind == VAR &&
726 sym.owner.kind == TYP &&
727 (sym.flags() & STATIC) == 0)
728 return new StaticError(sym);
729 else
730 return sym;
731 } else if (sym.kind < bestSoFar.kind) {
732 bestSoFar = sym;
733 }
735 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
736 env1 = env1.outer;
737 }
739 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
740 if (sym.exists())
741 return sym;
742 if (bestSoFar.exists())
743 return bestSoFar;
745 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
746 for (; e.scope != null; e = e.next()) {
747 sym = e.sym;
748 Type origin = e.getOrigin().owner.type;
749 if (sym.kind == VAR) {
750 if (e.sym.owner.type != origin)
751 sym = sym.clone(e.getOrigin().owner);
752 return isAccessible(env, origin, sym)
753 ? sym : new AccessError(env, origin, sym);
754 }
755 }
757 Symbol origin = null;
758 e = env.toplevel.starImportScope.lookup(name);
759 for (; e.scope != null; e = e.next()) {
760 sym = e.sym;
761 if (sym.kind != VAR)
762 continue;
763 // invariant: sym.kind == VAR
764 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
765 return new AmbiguityError(bestSoFar, sym);
766 else if (bestSoFar.kind >= VAR) {
767 origin = e.getOrigin().owner;
768 bestSoFar = isAccessible(env, origin.type, sym)
769 ? sym : new AccessError(env, origin.type, sym);
770 }
771 }
772 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
773 return bestSoFar.clone(origin);
774 else
775 return bestSoFar;
776 }
778 Warner noteWarner = new Warner();
780 /** Select the best method for a call site among two choices.
781 * @param env The current environment.
782 * @param site The original type from where the
783 * selection takes place.
784 * @param argtypes The invocation's value arguments,
785 * @param typeargtypes The invocation's type arguments,
786 * @param sym Proposed new best match.
787 * @param bestSoFar Previously found best match.
788 * @param allowBoxing Allow boxing conversions of arguments.
789 * @param useVarargs Box trailing arguments into an array for varargs.
790 */
791 @SuppressWarnings("fallthrough")
792 Symbol selectBest(Env<AttrContext> env,
793 Type site,
794 List<Type> argtypes,
795 List<Type> typeargtypes,
796 Symbol sym,
797 Symbol bestSoFar,
798 boolean allowBoxing,
799 boolean useVarargs,
800 boolean operator) {
801 if (sym.kind == ERR) return bestSoFar;
802 if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
803 Assert.check(sym.kind < AMBIGUOUS);
804 try {
805 Type mt = rawInstantiate(env, site, sym, argtypes, typeargtypes,
806 allowBoxing, useVarargs, Warner.noWarnings);
807 if (!operator) addVerboseApplicableCandidateDiag(sym ,mt);
808 } catch (InapplicableMethodException ex) {
809 if (!operator) addVerboseInapplicableCandidateDiag(sym, ex.getDiagnostic());
810 switch (bestSoFar.kind) {
811 case ABSENT_MTH:
812 return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
813 case WRONG_MTH:
814 if (operator) return bestSoFar;
815 wrongMethods.addCandidate(currentStep, wrongMethod.sym, wrongMethod.explanation);
816 case WRONG_MTHS:
817 return wrongMethods.addCandidate(currentStep, sym, ex.getDiagnostic());
818 default:
819 return bestSoFar;
820 }
821 }
822 if (!isAccessible(env, site, sym)) {
823 return (bestSoFar.kind == ABSENT_MTH)
824 ? new AccessError(env, site, sym)
825 : bestSoFar;
826 }
827 return (bestSoFar.kind > AMBIGUOUS)
828 ? sym
829 : mostSpecific(sym, bestSoFar, env, site,
830 allowBoxing && operator, useVarargs);
831 }
832 //where
833 void addVerboseApplicableCandidateDiag(Symbol sym, Type inst) {
834 if (!verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE))
835 return;
837 JCDiagnostic subDiag = null;
838 if (inst.getReturnType().tag == FORALL) {
839 Type diagType = types.createMethodTypeWithReturn(inst.asMethodType(),
840 ((ForAll)inst.getReturnType()).qtype);
841 subDiag = diags.fragment("partial.inst.sig", diagType);
842 } else if (sym.type.tag == FORALL) {
843 subDiag = diags.fragment("full.inst.sig", inst.asMethodType());
844 }
846 String key = subDiag == null ?
847 "applicable.method.found" :
848 "applicable.method.found.1";
850 verboseResolutionCandidateDiags.put(sym,
851 diags.fragment(key, verboseResolutionCandidateDiags.size(), sym, subDiag));
852 }
854 void addVerboseInapplicableCandidateDiag(Symbol sym, JCDiagnostic subDiag) {
855 if (!verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))
856 return;
857 verboseResolutionCandidateDiags.put(sym,
858 diags.fragment("not.applicable.method.found", verboseResolutionCandidateDiags.size(), sym, subDiag));
859 }
861 /* Return the most specific of the two methods for a call,
862 * given that both are accessible and applicable.
863 * @param m1 A new candidate for most specific.
864 * @param m2 The previous most specific candidate.
865 * @param env The current environment.
866 * @param site The original type from where the selection
867 * takes place.
868 * @param allowBoxing Allow boxing conversions of arguments.
869 * @param useVarargs Box trailing arguments into an array for varargs.
870 */
871 Symbol mostSpecific(Symbol m1,
872 Symbol m2,
873 Env<AttrContext> env,
874 final Type site,
875 boolean allowBoxing,
876 boolean useVarargs) {
877 switch (m2.kind) {
878 case MTH:
879 if (m1 == m2) return m1;
880 boolean m1SignatureMoreSpecific = signatureMoreSpecific(env, site, m1, m2, allowBoxing, useVarargs);
881 boolean m2SignatureMoreSpecific = signatureMoreSpecific(env, site, m2, m1, allowBoxing, useVarargs);
882 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
883 Type mt1 = types.memberType(site, m1);
884 Type mt2 = types.memberType(site, m2);
885 if (!types.overrideEquivalent(mt1, mt2))
886 return ambiguityError(m1, m2);
888 // same signature; select (a) the non-bridge method, or
889 // (b) the one that overrides the other, or (c) the concrete
890 // one, or (d) merge both abstract signatures
891 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
892 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
894 // if one overrides or hides the other, use it
895 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
896 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
897 if (types.asSuper(m1Owner.type, m2Owner) != null &&
898 ((m1.owner.flags_field & INTERFACE) == 0 ||
899 (m2.owner.flags_field & INTERFACE) != 0) &&
900 m1.overrides(m2, m1Owner, types, false))
901 return m1;
902 if (types.asSuper(m2Owner.type, m1Owner) != null &&
903 ((m2.owner.flags_field & INTERFACE) == 0 ||
904 (m1.owner.flags_field & INTERFACE) != 0) &&
905 m2.overrides(m1, m2Owner, types, false))
906 return m2;
907 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
908 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
909 if (m1Abstract && !m2Abstract) return m2;
910 if (m2Abstract && !m1Abstract) return m1;
911 // both abstract or both concrete
912 if (!m1Abstract && !m2Abstract)
913 return ambiguityError(m1, m2);
914 // check that both signatures have the same erasure
915 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
916 m2.erasure(types).getParameterTypes()))
917 return ambiguityError(m1, m2);
918 // both abstract, neither overridden; merge throws clause and result type
919 Type mst = mostSpecificReturnType(mt1, mt2);
920 if (mst == null) {
921 // Theoretically, this can't happen, but it is possible
922 // due to error recovery or mixing incompatible class files
923 return ambiguityError(m1, m2);
924 }
925 Symbol mostSpecific = mst == mt1 ? m1 : m2;
926 List<Type> allThrown = chk.intersect(mt1.getThrownTypes(), mt2.getThrownTypes());
927 Type newSig = types.createMethodTypeWithThrown(mostSpecific.type, allThrown);
928 MethodSymbol result = new MethodSymbol(
929 mostSpecific.flags(),
930 mostSpecific.name,
931 newSig,
932 mostSpecific.owner) {
933 @Override
934 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
935 if (origin == site.tsym)
936 return this;
937 else
938 return super.implementation(origin, types, checkResult);
939 }
940 };
941 return result;
942 }
943 if (m1SignatureMoreSpecific) return m1;
944 if (m2SignatureMoreSpecific) return m2;
945 return ambiguityError(m1, m2);
946 case AMBIGUOUS:
947 AmbiguityError e = (AmbiguityError)m2;
948 Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
949 Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
950 if (err1 == err2) return err1;
951 if (err1 == e.sym && err2 == e.sym2) return m2;
952 if (err1 instanceof AmbiguityError &&
953 err2 instanceof AmbiguityError &&
954 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
955 return ambiguityError(m1, m2);
956 else
957 return ambiguityError(err1, err2);
958 default:
959 throw new AssertionError();
960 }
961 }
962 //where
963 private boolean signatureMoreSpecific(Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
964 noteWarner.clear();
965 Type mtype1 = types.memberType(site, adjustVarargs(m1, m2, useVarargs));
966 Type mtype2 = instantiate(env, site, adjustVarargs(m2, m1, useVarargs),
967 types.lowerBoundArgtypes(mtype1), null,
968 allowBoxing, false, noteWarner);
969 return mtype2 != null &&
970 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
971 }
972 //where
973 private Symbol adjustVarargs(Symbol to, Symbol from, boolean useVarargs) {
974 List<Type> fromArgs = from.type.getParameterTypes();
975 List<Type> toArgs = to.type.getParameterTypes();
976 if (useVarargs &&
977 (from.flags() & VARARGS) != 0 &&
978 (to.flags() & VARARGS) != 0) {
979 Type varargsTypeFrom = fromArgs.last();
980 Type varargsTypeTo = toArgs.last();
981 ListBuffer<Type> args = ListBuffer.lb();
982 if (toArgs.length() < fromArgs.length()) {
983 //if we are checking a varargs method 'from' against another varargs
984 //method 'to' (where arity of 'to' < arity of 'from') then expand signature
985 //of 'to' to 'fit' arity of 'from' (this means adding fake formals to 'to'
986 //until 'to' signature has the same arity as 'from')
987 while (fromArgs.head != varargsTypeFrom) {
988 args.append(toArgs.head == varargsTypeTo ? types.elemtype(varargsTypeTo) : toArgs.head);
989 fromArgs = fromArgs.tail;
990 toArgs = toArgs.head == varargsTypeTo ?
991 toArgs :
992 toArgs.tail;
993 }
994 } else {
995 //formal argument list is same as original list where last
996 //argument (array type) is removed
997 args.appendList(toArgs.reverse().tail.reverse());
998 }
999 //append varargs element type as last synthetic formal
1000 args.append(types.elemtype(varargsTypeTo));
1001 Type mtype = types.createMethodTypeWithParameters(to.type, args.toList());
1002 return new MethodSymbol(to.flags_field & ~VARARGS, to.name, mtype, to.owner);
1003 } else {
1004 return to;
1005 }
1006 }
1007 //where
1008 Type mostSpecificReturnType(Type mt1, Type mt2) {
1009 Type rt1 = mt1.getReturnType();
1010 Type rt2 = mt2.getReturnType();
1012 if (mt1.tag == FORALL && mt2.tag == FORALL) {
1013 //if both are generic methods, adjust return type ahead of subtyping check
1014 rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
1015 }
1016 //first use subtyping, then return type substitutability
1017 if (types.isSubtype(rt1, rt2)) {
1018 return mt1;
1019 } else if (types.isSubtype(rt2, rt1)) {
1020 return mt2;
1021 } else if (types.returnTypeSubstitutable(mt1, mt2)) {
1022 return mt1;
1023 } else if (types.returnTypeSubstitutable(mt2, mt1)) {
1024 return mt2;
1025 } else {
1026 return null;
1027 }
1028 }
1029 //where
1030 Symbol ambiguityError(Symbol m1, Symbol m2) {
1031 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
1032 return (m1.flags() & CLASH) == 0 ? m1 : m2;
1033 } else {
1034 return new AmbiguityError(m1, m2);
1035 }
1036 }
1038 /** Find best qualified method matching given name, type and value
1039 * arguments.
1040 * @param env The current environment.
1041 * @param site The original type from where the selection
1042 * takes place.
1043 * @param name The method's name.
1044 * @param argtypes The method's value arguments.
1045 * @param typeargtypes The method's type arguments
1046 * @param allowBoxing Allow boxing conversions of arguments.
1047 * @param useVarargs Box trailing arguments into an array for varargs.
1048 */
1049 Symbol findMethod(Env<AttrContext> env,
1050 Type site,
1051 Name name,
1052 List<Type> argtypes,
1053 List<Type> typeargtypes,
1054 boolean allowBoxing,
1055 boolean useVarargs,
1056 boolean operator) {
1057 verboseResolutionCandidateDiags.clear();
1058 Symbol bestSoFar = methodNotFound;
1059 bestSoFar = findMethod(env,
1060 site,
1061 name,
1062 argtypes,
1063 typeargtypes,
1064 site.tsym.type,
1065 true,
1066 bestSoFar,
1067 allowBoxing,
1068 useVarargs,
1069 operator,
1070 new HashSet<TypeSymbol>());
1071 reportVerboseResolutionDiagnostic(env.tree.pos(), name, site, argtypes, typeargtypes, bestSoFar);
1072 return bestSoFar;
1073 }
1074 // where
1075 private Symbol findMethod(Env<AttrContext> env,
1076 Type site,
1077 Name name,
1078 List<Type> argtypes,
1079 List<Type> typeargtypes,
1080 Type intype,
1081 boolean abstractok,
1082 Symbol bestSoFar,
1083 boolean allowBoxing,
1084 boolean useVarargs,
1085 boolean operator,
1086 Set<TypeSymbol> seen) {
1087 for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
1088 while (ct.tag == TYPEVAR)
1089 ct = ct.getUpperBound();
1090 ClassSymbol c = (ClassSymbol)ct.tsym;
1091 if (!seen.add(c)) return bestSoFar;
1092 if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
1093 abstractok = false;
1094 for (Scope.Entry e = c.members().lookup(name);
1095 e.scope != null;
1096 e = e.next()) {
1097 //- System.out.println(" e " + e.sym);
1098 if (e.sym.kind == MTH &&
1099 (e.sym.flags_field & SYNTHETIC) == 0) {
1100 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
1101 e.sym, bestSoFar,
1102 allowBoxing,
1103 useVarargs,
1104 operator);
1105 }
1106 }
1107 if (name == names.init)
1108 break;
1109 //- System.out.println(" - " + bestSoFar);
1110 if (abstractok) {
1111 Symbol concrete = methodNotFound;
1112 if ((bestSoFar.flags() & ABSTRACT) == 0)
1113 concrete = bestSoFar;
1114 for (List<Type> l = types.interfaces(c.type);
1115 l.nonEmpty();
1116 l = l.tail) {
1117 bestSoFar = findMethod(env, site, name, argtypes,
1118 typeargtypes,
1119 l.head, abstractok, bestSoFar,
1120 allowBoxing, useVarargs, operator, seen);
1121 }
1122 if (concrete != bestSoFar &&
1123 concrete.kind < ERR && bestSoFar.kind < ERR &&
1124 types.isSubSignature(concrete.type, bestSoFar.type))
1125 bestSoFar = concrete;
1126 }
1127 }
1128 return bestSoFar;
1129 }
1130 //where
1131 void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
1132 boolean success = bestSoFar.kind < ERRONEOUS;
1134 if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
1135 return;
1136 } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
1137 return;
1138 }
1140 if (bestSoFar.name == names.init &&
1141 bestSoFar.owner == syms.objectType.tsym &&
1142 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
1143 return; //skip diags for Object constructor resolution
1144 } else if (site == syms.predefClass.type && !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
1145 return; //skip spurious diags for predef symbols (i.e. operators)
1146 } else if (internalResolution && !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
1147 return;
1148 }
1150 int pos = 0;
1151 for (Symbol s : verboseResolutionCandidateDiags.keySet()) {
1152 if (s == bestSoFar) break;
1153 pos++;
1154 }
1155 String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
1156 JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name, site.tsym, pos, currentStep,
1157 methodArguments(argtypes), methodArguments(typeargtypes));
1158 JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, List.from(verboseResolutionCandidateDiags.values().toArray(new JCDiagnostic[verboseResolutionCandidateDiags.size()])));
1159 log.report(d);
1160 }
1162 /** Find unqualified method matching given name, type and value arguments.
1163 * @param env The current environment.
1164 * @param name The method's name.
1165 * @param argtypes The method's value arguments.
1166 * @param typeargtypes The method's type arguments.
1167 * @param allowBoxing Allow boxing conversions of arguments.
1168 * @param useVarargs Box trailing arguments into an array for varargs.
1169 */
1170 Symbol findFun(Env<AttrContext> env, Name name,
1171 List<Type> argtypes, List<Type> typeargtypes,
1172 boolean allowBoxing, boolean useVarargs) {
1173 Symbol bestSoFar = methodNotFound;
1174 Symbol sym;
1175 Env<AttrContext> env1 = env;
1176 boolean staticOnly = false;
1177 while (env1.outer != null) {
1178 if (isStatic(env1)) staticOnly = true;
1179 sym = findMethod(
1180 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
1181 allowBoxing, useVarargs, false);
1182 if (sym.exists()) {
1183 if (staticOnly &&
1184 sym.kind == MTH &&
1185 sym.owner.kind == TYP &&
1186 (sym.flags() & STATIC) == 0) return new StaticError(sym);
1187 else return sym;
1188 } else if (sym.kind < bestSoFar.kind) {
1189 bestSoFar = sym;
1190 }
1191 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1192 env1 = env1.outer;
1193 }
1195 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1196 typeargtypes, allowBoxing, useVarargs, false);
1197 if (sym.exists())
1198 return sym;
1200 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
1201 for (; e.scope != null; e = e.next()) {
1202 sym = e.sym;
1203 Type origin = e.getOrigin().owner.type;
1204 if (sym.kind == MTH) {
1205 if (e.sym.owner.type != origin)
1206 sym = sym.clone(e.getOrigin().owner);
1207 if (!isAccessible(env, origin, sym))
1208 sym = new AccessError(env, origin, sym);
1209 bestSoFar = selectBest(env, origin,
1210 argtypes, typeargtypes,
1211 sym, bestSoFar,
1212 allowBoxing, useVarargs, false);
1213 }
1214 }
1215 if (bestSoFar.exists())
1216 return bestSoFar;
1218 e = env.toplevel.starImportScope.lookup(name);
1219 for (; e.scope != null; e = e.next()) {
1220 sym = e.sym;
1221 Type origin = e.getOrigin().owner.type;
1222 if (sym.kind == MTH) {
1223 if (e.sym.owner.type != origin)
1224 sym = sym.clone(e.getOrigin().owner);
1225 if (!isAccessible(env, origin, sym))
1226 sym = new AccessError(env, origin, sym);
1227 bestSoFar = selectBest(env, origin,
1228 argtypes, typeargtypes,
1229 sym, bestSoFar,
1230 allowBoxing, useVarargs, false);
1231 }
1232 }
1233 return bestSoFar;
1234 }
1236 /** Load toplevel or member class with given fully qualified name and
1237 * verify that it is accessible.
1238 * @param env The current environment.
1239 * @param name The fully qualified name of the class to be loaded.
1240 */
1241 Symbol loadClass(Env<AttrContext> env, Name name) {
1242 try {
1243 ClassSymbol c = reader.loadClass(name);
1244 return isAccessible(env, c) ? c : new AccessError(c);
1245 } catch (ClassReader.BadClassFile err) {
1246 throw err;
1247 } catch (CompletionFailure ex) {
1248 return typeNotFound;
1249 }
1250 }
1252 /** Find qualified member type.
1253 * @param env The current environment.
1254 * @param site The original type from where the selection takes
1255 * place.
1256 * @param name The type's name.
1257 * @param c The class to search for the member type. This is
1258 * always a superclass or implemented interface of
1259 * site's class.
1260 */
1261 Symbol findMemberType(Env<AttrContext> env,
1262 Type site,
1263 Name name,
1264 TypeSymbol c) {
1265 Symbol bestSoFar = typeNotFound;
1266 Symbol sym;
1267 Scope.Entry e = c.members().lookup(name);
1268 while (e.scope != null) {
1269 if (e.sym.kind == TYP) {
1270 return isAccessible(env, site, e.sym)
1271 ? e.sym
1272 : new AccessError(env, site, e.sym);
1273 }
1274 e = e.next();
1275 }
1276 Type st = types.supertype(c.type);
1277 if (st != null && st.tag == CLASS) {
1278 sym = findMemberType(env, site, name, st.tsym);
1279 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1280 }
1281 for (List<Type> l = types.interfaces(c.type);
1282 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1283 l = l.tail) {
1284 sym = findMemberType(env, site, name, l.head.tsym);
1285 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1286 sym.owner != bestSoFar.owner)
1287 bestSoFar = new AmbiguityError(bestSoFar, sym);
1288 else if (sym.kind < bestSoFar.kind)
1289 bestSoFar = sym;
1290 }
1291 return bestSoFar;
1292 }
1294 /** Find a global type in given scope and load corresponding class.
1295 * @param env The current environment.
1296 * @param scope The scope in which to look for the type.
1297 * @param name The type's name.
1298 */
1299 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1300 Symbol bestSoFar = typeNotFound;
1301 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1302 Symbol sym = loadClass(env, e.sym.flatName());
1303 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1304 bestSoFar != sym)
1305 return new AmbiguityError(bestSoFar, sym);
1306 else if (sym.kind < bestSoFar.kind)
1307 bestSoFar = sym;
1308 }
1309 return bestSoFar;
1310 }
1312 /** Find an unqualified type symbol.
1313 * @param env The current environment.
1314 * @param name The type's name.
1315 */
1316 Symbol findType(Env<AttrContext> env, Name name) {
1317 Symbol bestSoFar = typeNotFound;
1318 Symbol sym;
1319 boolean staticOnly = false;
1320 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1321 if (isStatic(env1)) staticOnly = true;
1322 for (Scope.Entry e = env1.info.scope.lookup(name);
1323 e.scope != null;
1324 e = e.next()) {
1325 if (e.sym.kind == TYP) {
1326 if (staticOnly &&
1327 e.sym.type.tag == TYPEVAR &&
1328 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1329 return e.sym;
1330 }
1331 }
1333 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1334 env1.enclClass.sym);
1335 if (staticOnly && sym.kind == TYP &&
1336 sym.type.tag == CLASS &&
1337 sym.type.getEnclosingType().tag == CLASS &&
1338 env1.enclClass.sym.type.isParameterized() &&
1339 sym.type.getEnclosingType().isParameterized())
1340 return new StaticError(sym);
1341 else if (sym.exists()) return sym;
1342 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1344 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1345 if ((encl.sym.flags() & STATIC) != 0)
1346 staticOnly = true;
1347 }
1349 if (!env.tree.hasTag(IMPORT)) {
1350 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1351 if (sym.exists()) return sym;
1352 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1354 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1355 if (sym.exists()) return sym;
1356 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1358 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1359 if (sym.exists()) return sym;
1360 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1361 }
1363 return bestSoFar;
1364 }
1366 /** Find an unqualified identifier which matches a specified kind set.
1367 * @param env The current environment.
1368 * @param name The indentifier's name.
1369 * @param kind Indicates the possible symbol kinds
1370 * (a subset of VAL, TYP, PCK).
1371 */
1372 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1373 Symbol bestSoFar = typeNotFound;
1374 Symbol sym;
1376 if ((kind & VAR) != 0) {
1377 sym = findVar(env, name);
1378 if (sym.exists()) return sym;
1379 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1380 }
1382 if ((kind & TYP) != 0) {
1383 sym = findType(env, name);
1384 if (sym.exists()) return sym;
1385 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1386 }
1388 if ((kind & PCK) != 0) return reader.enterPackage(name);
1389 else return bestSoFar;
1390 }
1392 /** Find an identifier in a package which matches a specified kind set.
1393 * @param env The current environment.
1394 * @param name The identifier's name.
1395 * @param kind Indicates the possible symbol kinds
1396 * (a nonempty subset of TYP, PCK).
1397 */
1398 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1399 Name name, int kind) {
1400 Name fullname = TypeSymbol.formFullName(name, pck);
1401 Symbol bestSoFar = typeNotFound;
1402 PackageSymbol pack = null;
1403 if ((kind & PCK) != 0) {
1404 pack = reader.enterPackage(fullname);
1405 if (pack.exists()) return pack;
1406 }
1407 if ((kind & TYP) != 0) {
1408 Symbol sym = loadClass(env, fullname);
1409 if (sym.exists()) {
1410 // don't allow programs to use flatnames
1411 if (name == sym.name) return sym;
1412 }
1413 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1414 }
1415 return (pack != null) ? pack : bestSoFar;
1416 }
1418 /** Find an identifier among the members of a given type `site'.
1419 * @param env The current environment.
1420 * @param site The type containing the symbol to be found.
1421 * @param name The identifier's name.
1422 * @param kind Indicates the possible symbol kinds
1423 * (a subset of VAL, TYP).
1424 */
1425 Symbol findIdentInType(Env<AttrContext> env, Type site,
1426 Name name, int kind) {
1427 Symbol bestSoFar = typeNotFound;
1428 Symbol sym;
1429 if ((kind & VAR) != 0) {
1430 sym = findField(env, site, name, site.tsym);
1431 if (sym.exists()) return sym;
1432 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1433 }
1435 if ((kind & TYP) != 0) {
1436 sym = findMemberType(env, site, name, site.tsym);
1437 if (sym.exists()) return sym;
1438 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1439 }
1440 return bestSoFar;
1441 }
1443 /* ***************************************************************************
1444 * Access checking
1445 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1446 * an error message in the process
1447 ****************************************************************************/
1449 /** If `sym' is a bad symbol: report error and return errSymbol
1450 * else pass through unchanged,
1451 * additional arguments duplicate what has been used in trying to find the
1452 * symbol (--> flyweight pattern). This improves performance since we
1453 * expect misses to happen frequently.
1454 *
1455 * @param sym The symbol that was found, or a ResolveError.
1456 * @param pos The position to use for error reporting.
1457 * @param site The original type from where the selection took place.
1458 * @param name The symbol's name.
1459 * @param argtypes The invocation's value arguments,
1460 * if we looked for a method.
1461 * @param typeargtypes The invocation's type arguments,
1462 * if we looked for a method.
1463 */
1464 Symbol access(Symbol sym,
1465 DiagnosticPosition pos,
1466 Symbol location,
1467 Type site,
1468 Name name,
1469 boolean qualified,
1470 List<Type> argtypes,
1471 List<Type> typeargtypes) {
1472 if (sym.kind >= AMBIGUOUS) {
1473 ResolveError errSym = (ResolveError)sym;
1474 if (!site.isErroneous() &&
1475 !Type.isErroneous(argtypes) &&
1476 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
1477 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
1478 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1479 }
1480 return sym;
1481 }
1483 /** Same as original access(), but without location.
1484 */
1485 Symbol access(Symbol sym,
1486 DiagnosticPosition pos,
1487 Type site,
1488 Name name,
1489 boolean qualified,
1490 List<Type> argtypes,
1491 List<Type> typeargtypes) {
1492 return access(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
1493 }
1495 /** Same as original access(), but without type arguments and arguments.
1496 */
1497 Symbol access(Symbol sym,
1498 DiagnosticPosition pos,
1499 Symbol location,
1500 Type site,
1501 Name name,
1502 boolean qualified) {
1503 if (sym.kind >= AMBIGUOUS)
1504 return access(sym, pos, location, site, name, qualified, List.<Type>nil(), null);
1505 else
1506 return sym;
1507 }
1509 /** Same as original access(), but without location, type arguments and arguments.
1510 */
1511 Symbol access(Symbol sym,
1512 DiagnosticPosition pos,
1513 Type site,
1514 Name name,
1515 boolean qualified) {
1516 return access(sym, pos, site.tsym, site, name, qualified);
1517 }
1519 /** Check that sym is not an abstract method.
1520 */
1521 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1522 if ((sym.flags() & ABSTRACT) != 0)
1523 log.error(pos, "abstract.cant.be.accessed.directly",
1524 kindName(sym), sym, sym.location());
1525 }
1527 /* ***************************************************************************
1528 * Debugging
1529 ****************************************************************************/
1531 /** print all scopes starting with scope s and proceeding outwards.
1532 * used for debugging.
1533 */
1534 public void printscopes(Scope s) {
1535 while (s != null) {
1536 if (s.owner != null)
1537 System.err.print(s.owner + ": ");
1538 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1539 if ((e.sym.flags() & ABSTRACT) != 0)
1540 System.err.print("abstract ");
1541 System.err.print(e.sym + " ");
1542 }
1543 System.err.println();
1544 s = s.next;
1545 }
1546 }
1548 void printscopes(Env<AttrContext> env) {
1549 while (env.outer != null) {
1550 System.err.println("------------------------------");
1551 printscopes(env.info.scope);
1552 env = env.outer;
1553 }
1554 }
1556 public void printscopes(Type t) {
1557 while (t.tag == CLASS) {
1558 printscopes(t.tsym.members());
1559 t = types.supertype(t);
1560 }
1561 }
1563 /* ***************************************************************************
1564 * Name resolution
1565 * Naming conventions are as for symbol lookup
1566 * Unlike the find... methods these methods will report access errors
1567 ****************************************************************************/
1569 /** Resolve an unqualified (non-method) identifier.
1570 * @param pos The position to use for error reporting.
1571 * @param env The environment current at the identifier use.
1572 * @param name The identifier's name.
1573 * @param kind The set of admissible symbol kinds for the identifier.
1574 */
1575 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
1576 Name name, int kind) {
1577 return access(
1578 findIdent(env, name, kind),
1579 pos, env.enclClass.sym.type, name, false);
1580 }
1582 /** Resolve an unqualified method identifier.
1583 * @param pos The position to use for error reporting.
1584 * @param env The environment current at the method invocation.
1585 * @param name The identifier's name.
1586 * @param argtypes The types of the invocation's value arguments.
1587 * @param typeargtypes The types of the invocation's type arguments.
1588 */
1589 Symbol resolveMethod(DiagnosticPosition pos,
1590 Env<AttrContext> env,
1591 Name name,
1592 List<Type> argtypes,
1593 List<Type> typeargtypes) {
1594 Symbol sym = startResolution();
1595 List<MethodResolutionPhase> steps = methodResolutionSteps;
1596 while (steps.nonEmpty() &&
1597 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1598 sym.kind >= ERRONEOUS) {
1599 currentStep = steps.head;
1600 sym = findFun(env, name, argtypes, typeargtypes,
1601 steps.head.isBoxingRequired,
1602 env.info.varArgs = steps.head.isVarargsRequired);
1603 methodResolutionCache.put(steps.head, sym);
1604 steps = steps.tail;
1605 }
1606 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1607 MethodResolutionPhase errPhase =
1608 firstErroneousResolutionPhase();
1609 sym = access(methodResolutionCache.get(errPhase),
1610 pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
1611 env.info.varArgs = errPhase.isVarargsRequired;
1612 }
1613 return sym;
1614 }
1616 private Symbol startResolution() {
1617 wrongMethod.clear();
1618 wrongMethods.clear();
1619 return methodNotFound;
1620 }
1622 /** Resolve a qualified method identifier
1623 * @param pos The position to use for error reporting.
1624 * @param env The environment current at the method invocation.
1625 * @param site The type of the qualifying expression, in which
1626 * identifier is searched.
1627 * @param name The identifier's name.
1628 * @param argtypes The types of the invocation's value arguments.
1629 * @param typeargtypes The types of the invocation's type arguments.
1630 */
1631 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1632 Type site, Name name, List<Type> argtypes,
1633 List<Type> typeargtypes) {
1634 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
1635 }
1636 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1637 Symbol location, Type site, Name name, List<Type> argtypes,
1638 List<Type> typeargtypes) {
1639 Symbol sym = startResolution();
1640 List<MethodResolutionPhase> steps = methodResolutionSteps;
1641 while (steps.nonEmpty() &&
1642 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1643 sym.kind >= ERRONEOUS) {
1644 currentStep = steps.head;
1645 sym = findMethod(env, site, name, argtypes, typeargtypes,
1646 steps.head.isBoxingRequired(),
1647 env.info.varArgs = steps.head.isVarargsRequired(), false);
1648 methodResolutionCache.put(steps.head, sym);
1649 steps = steps.tail;
1650 }
1651 if (sym.kind >= AMBIGUOUS) {
1652 if (site.tsym.isPolymorphicSignatureGeneric()) {
1653 //polymorphic receiver - synthesize new method symbol
1654 env.info.varArgs = false;
1655 sym = findPolymorphicSignatureInstance(env,
1656 site, name, null, argtypes);
1657 }
1658 else {
1659 //if nothing is found return the 'first' error
1660 MethodResolutionPhase errPhase =
1661 firstErroneousResolutionPhase();
1662 sym = access(methodResolutionCache.get(errPhase),
1663 pos, location, site, name, true, argtypes, typeargtypes);
1664 env.info.varArgs = errPhase.isVarargsRequired;
1665 }
1666 } else if (allowMethodHandles && sym.isPolymorphicSignatureGeneric()) {
1667 //non-instantiated polymorphic signature - synthesize new method symbol
1668 env.info.varArgs = false;
1669 sym = findPolymorphicSignatureInstance(env,
1670 site, name, (MethodSymbol)sym, argtypes);
1671 }
1672 return sym;
1673 }
1675 /** Find or create an implicit method of exactly the given type (after erasure).
1676 * Searches in a side table, not the main scope of the site.
1677 * This emulates the lookup process required by JSR 292 in JVM.
1678 * @param env Attribution environment
1679 * @param site The original type from where the selection takes place.
1680 * @param name The method's name.
1681 * @param spMethod A template for the implicit method, or null.
1682 * @param argtypes The required argument types.
1683 * @param typeargtypes The required type arguments.
1684 */
1685 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env, Type site,
1686 Name name,
1687 MethodSymbol spMethod, // sig. poly. method or null if none
1688 List<Type> argtypes) {
1689 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
1690 site, name, spMethod, argtypes);
1691 long flags = ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE |
1692 (spMethod != null ?
1693 spMethod.flags() & Flags.AccessFlags :
1694 Flags.PUBLIC | Flags.STATIC);
1695 Symbol m = null;
1696 for (Scope.Entry e = polymorphicSignatureScope.lookup(name);
1697 e.scope != null;
1698 e = e.next()) {
1699 Symbol sym = e.sym;
1700 if (types.isSameType(mtype, sym.type) &&
1701 (sym.flags() & Flags.STATIC) == (flags & Flags.STATIC) &&
1702 types.isSameType(sym.owner.type, site)) {
1703 m = sym;
1704 break;
1705 }
1706 }
1707 if (m == null) {
1708 // create the desired method
1709 m = new MethodSymbol(flags, name, mtype, site.tsym);
1710 polymorphicSignatureScope.enter(m);
1711 }
1712 return m;
1713 }
1715 /** Resolve a qualified method identifier, throw a fatal error if not
1716 * found.
1717 * @param pos The position to use for error reporting.
1718 * @param env The environment current at the method invocation.
1719 * @param site The type of the qualifying expression, in which
1720 * identifier is searched.
1721 * @param name The identifier's name.
1722 * @param argtypes The types of the invocation's value arguments.
1723 * @param typeargtypes The types of the invocation's type arguments.
1724 */
1725 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
1726 Type site, Name name,
1727 List<Type> argtypes,
1728 List<Type> typeargtypes) {
1729 boolean prevInternal = internalResolution;
1730 try {
1731 internalResolution = true;
1732 Symbol sym = resolveQualifiedMethod(
1733 pos, env, site.tsym, site, name, argtypes, typeargtypes);
1734 if (sym.kind == MTH) return (MethodSymbol)sym;
1735 else throw new FatalError(
1736 diags.fragment("fatal.err.cant.locate.meth",
1737 name));
1738 }
1739 finally {
1740 internalResolution = prevInternal;
1741 }
1742 }
1744 /** Resolve constructor.
1745 * @param pos The position to use for error reporting.
1746 * @param env The environment current at the constructor invocation.
1747 * @param site The type of class for which a constructor is searched.
1748 * @param argtypes The types of the constructor invocation's value
1749 * arguments.
1750 * @param typeargtypes The types of the constructor invocation's type
1751 * arguments.
1752 */
1753 Symbol resolveConstructor(DiagnosticPosition pos,
1754 Env<AttrContext> env,
1755 Type site,
1756 List<Type> argtypes,
1757 List<Type> typeargtypes) {
1758 Symbol sym = startResolution();
1759 List<MethodResolutionPhase> steps = methodResolutionSteps;
1760 while (steps.nonEmpty() &&
1761 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1762 sym.kind >= ERRONEOUS) {
1763 currentStep = steps.head;
1764 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1765 steps.head.isBoxingRequired(),
1766 env.info.varArgs = steps.head.isVarargsRequired());
1767 methodResolutionCache.put(steps.head, sym);
1768 steps = steps.tail;
1769 }
1770 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1771 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1772 sym = access(methodResolutionCache.get(errPhase),
1773 pos, site, names.init, true, argtypes, typeargtypes);
1774 env.info.varArgs = errPhase.isVarargsRequired();
1775 }
1776 return sym;
1777 }
1779 /** Resolve constructor using diamond inference.
1780 * @param pos The position to use for error reporting.
1781 * @param env The environment current at the constructor invocation.
1782 * @param site The type of class for which a constructor is searched.
1783 * The scope of this class has been touched in attribution.
1784 * @param argtypes The types of the constructor invocation's value
1785 * arguments.
1786 * @param typeargtypes The types of the constructor invocation's type
1787 * arguments.
1788 */
1789 Symbol resolveDiamond(DiagnosticPosition pos,
1790 Env<AttrContext> env,
1791 Type site,
1792 List<Type> argtypes,
1793 List<Type> typeargtypes) {
1794 Symbol sym = startResolution();
1795 List<MethodResolutionPhase> steps = methodResolutionSteps;
1796 while (steps.nonEmpty() &&
1797 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1798 sym.kind >= ERRONEOUS) {
1799 currentStep = steps.head;
1800 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1801 steps.head.isBoxingRequired(),
1802 env.info.varArgs = steps.head.isVarargsRequired());
1803 methodResolutionCache.put(steps.head, sym);
1804 steps = steps.tail;
1805 }
1806 if (sym.kind >= AMBIGUOUS) {
1807 final JCDiagnostic details = sym.kind == WRONG_MTH ?
1808 ((InapplicableSymbolError)sym).explanation :
1809 null;
1810 Symbol errSym = new ResolveError(WRONG_MTH, "diamond error") {
1811 @Override
1812 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
1813 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
1814 String key = details == null ?
1815 "cant.apply.diamond" :
1816 "cant.apply.diamond.1";
1817 return diags.create(dkind, log.currentSource(), pos, key,
1818 diags.fragment("diamond", site.tsym), details);
1819 }
1820 };
1821 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1822 sym = access(errSym, pos, site, names.init, true, argtypes, typeargtypes);
1823 env.info.varArgs = errPhase.isVarargsRequired();
1824 }
1825 return sym;
1826 }
1828 /** Resolve constructor.
1829 * @param pos The position to use for error reporting.
1830 * @param env The environment current at the constructor invocation.
1831 * @param site The type of class for which a constructor is searched.
1832 * @param argtypes The types of the constructor invocation's value
1833 * arguments.
1834 * @param typeargtypes The types of the constructor invocation's type
1835 * arguments.
1836 * @param allowBoxing Allow boxing and varargs conversions.
1837 * @param useVarargs Box trailing arguments into an array for varargs.
1838 */
1839 Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1840 Type site, List<Type> argtypes,
1841 List<Type> typeargtypes,
1842 boolean allowBoxing,
1843 boolean useVarargs) {
1844 Symbol sym = findMethod(env, site,
1845 names.init, argtypes,
1846 typeargtypes, allowBoxing,
1847 useVarargs, false);
1848 chk.checkDeprecated(pos, env.info.scope.owner, sym);
1849 return sym;
1850 }
1852 /** Resolve a constructor, throw a fatal error if not found.
1853 * @param pos The position to use for error reporting.
1854 * @param env The environment current at the method invocation.
1855 * @param site The type to be constructed.
1856 * @param argtypes The types of the invocation's value arguments.
1857 * @param typeargtypes The types of the invocation's type arguments.
1858 */
1859 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1860 Type site,
1861 List<Type> argtypes,
1862 List<Type> typeargtypes) {
1863 Symbol sym = resolveConstructor(
1864 pos, env, site, argtypes, typeargtypes);
1865 if (sym.kind == MTH) return (MethodSymbol)sym;
1866 else throw new FatalError(
1867 diags.fragment("fatal.err.cant.locate.ctor", site));
1868 }
1870 /** Resolve operator.
1871 * @param pos The position to use for error reporting.
1872 * @param optag The tag of the operation tree.
1873 * @param env The environment current at the operation.
1874 * @param argtypes The types of the operands.
1875 */
1876 Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
1877 Env<AttrContext> env, List<Type> argtypes) {
1878 startResolution();
1879 Name name = treeinfo.operatorName(optag);
1880 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
1881 null, false, false, true);
1882 if (boxingEnabled && sym.kind >= WRONG_MTHS)
1883 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1884 null, true, false, true);
1885 return access(sym, pos, env.enclClass.sym.type, name,
1886 false, argtypes, null);
1887 }
1889 /** Resolve operator.
1890 * @param pos The position to use for error reporting.
1891 * @param optag The tag of the operation tree.
1892 * @param env The environment current at the operation.
1893 * @param arg The type of the operand.
1894 */
1895 Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
1896 return resolveOperator(pos, optag, env, List.of(arg));
1897 }
1899 /** Resolve binary operator.
1900 * @param pos The position to use for error reporting.
1901 * @param optag The tag of the operation tree.
1902 * @param env The environment current at the operation.
1903 * @param left The types of the left operand.
1904 * @param right The types of the right operand.
1905 */
1906 Symbol resolveBinaryOperator(DiagnosticPosition pos,
1907 JCTree.Tag optag,
1908 Env<AttrContext> env,
1909 Type left,
1910 Type right) {
1911 return resolveOperator(pos, optag, env, List.of(left, right));
1912 }
1914 /**
1915 * Resolve `c.name' where name == this or name == super.
1916 * @param pos The position to use for error reporting.
1917 * @param env The environment current at the expression.
1918 * @param c The qualifier.
1919 * @param name The identifier's name.
1920 */
1921 Symbol resolveSelf(DiagnosticPosition pos,
1922 Env<AttrContext> env,
1923 TypeSymbol c,
1924 Name name) {
1925 Env<AttrContext> env1 = env;
1926 boolean staticOnly = false;
1927 while (env1.outer != null) {
1928 if (isStatic(env1)) staticOnly = true;
1929 if (env1.enclClass.sym == c) {
1930 Symbol sym = env1.info.scope.lookup(name).sym;
1931 if (sym != null) {
1932 if (staticOnly) sym = new StaticError(sym);
1933 return access(sym, pos, env.enclClass.sym.type,
1934 name, true);
1935 }
1936 }
1937 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1938 env1 = env1.outer;
1939 }
1940 log.error(pos, "not.encl.class", c);
1941 return syms.errSymbol;
1942 }
1944 /**
1945 * Resolve `c.this' for an enclosing class c that contains the
1946 * named member.
1947 * @param pos The position to use for error reporting.
1948 * @param env The environment current at the expression.
1949 * @param member The member that must be contained in the result.
1950 */
1951 Symbol resolveSelfContaining(DiagnosticPosition pos,
1952 Env<AttrContext> env,
1953 Symbol member,
1954 boolean isSuperCall) {
1955 Name name = names._this;
1956 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
1957 boolean staticOnly = false;
1958 if (env1 != null) {
1959 while (env1 != null && env1.outer != null) {
1960 if (isStatic(env1)) staticOnly = true;
1961 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
1962 Symbol sym = env1.info.scope.lookup(name).sym;
1963 if (sym != null) {
1964 if (staticOnly) sym = new StaticError(sym);
1965 return access(sym, pos, env.enclClass.sym.type,
1966 name, true);
1967 }
1968 }
1969 if ((env1.enclClass.sym.flags() & STATIC) != 0)
1970 staticOnly = true;
1971 env1 = env1.outer;
1972 }
1973 }
1974 log.error(pos, "encl.class.required", member);
1975 return syms.errSymbol;
1976 }
1978 /**
1979 * Resolve an appropriate implicit this instance for t's container.
1980 * JLS 8.8.5.1 and 15.9.2
1981 */
1982 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
1983 return resolveImplicitThis(pos, env, t, false);
1984 }
1986 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
1987 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
1988 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
1989 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
1990 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
1991 log.error(pos, "cant.ref.before.ctor.called", "this");
1992 return thisType;
1993 }
1995 /* ***************************************************************************
1996 * ResolveError classes, indicating error situations when accessing symbols
1997 ****************************************************************************/
1999 public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
2000 AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
2001 logResolveError(error, tree.pos(), type.getEnclosingType().tsym, type.getEnclosingType(), null, null, null);
2002 }
2003 //where
2004 private void logResolveError(ResolveError error,
2005 DiagnosticPosition pos,
2006 Symbol location,
2007 Type site,
2008 Name name,
2009 List<Type> argtypes,
2010 List<Type> typeargtypes) {
2011 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
2012 pos, location, site, name, argtypes, typeargtypes);
2013 if (d != null) {
2014 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
2015 log.report(d);
2016 }
2017 }
2019 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
2021 public Object methodArguments(List<Type> argtypes) {
2022 return argtypes == null || argtypes.isEmpty() ? noArgs : argtypes;
2023 }
2025 /**
2026 * Root class for resolution errors. Subclass of ResolveError
2027 * represent a different kinds of resolution error - as such they must
2028 * specify how they map into concrete compiler diagnostics.
2029 */
2030 private abstract class ResolveError extends Symbol {
2032 /** The name of the kind of error, for debugging only. */
2033 final String debugName;
2035 ResolveError(int kind, String debugName) {
2036 super(kind, 0, null, null, null);
2037 this.debugName = debugName;
2038 }
2040 @Override
2041 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
2042 throw new AssertionError();
2043 }
2045 @Override
2046 public String toString() {
2047 return debugName;
2048 }
2050 @Override
2051 public boolean exists() {
2052 return false;
2053 }
2055 /**
2056 * Create an external representation for this erroneous symbol to be
2057 * used during attribution - by default this returns the symbol of a
2058 * brand new error type which stores the original type found
2059 * during resolution.
2060 *
2061 * @param name the name used during resolution
2062 * @param location the location from which the symbol is accessed
2063 */
2064 protected Symbol access(Name name, TypeSymbol location) {
2065 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
2066 }
2068 /**
2069 * Create a diagnostic representing this resolution error.
2070 *
2071 * @param dkind The kind of the diagnostic to be created (e.g error).
2072 * @param pos The position to be used for error reporting.
2073 * @param site The original type from where the selection took place.
2074 * @param name The name of the symbol to be resolved.
2075 * @param argtypes The invocation's value arguments,
2076 * if we looked for a method.
2077 * @param typeargtypes The invocation's type arguments,
2078 * if we looked for a method.
2079 */
2080 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2081 DiagnosticPosition pos,
2082 Symbol location,
2083 Type site,
2084 Name name,
2085 List<Type> argtypes,
2086 List<Type> typeargtypes);
2088 /**
2089 * A name designates an operator if it consists
2090 * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
2091 */
2092 boolean isOperator(Name name) {
2093 int i = 0;
2094 while (i < name.getByteLength() &&
2095 "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
2096 return i > 0 && i == name.getByteLength();
2097 }
2098 }
2100 /**
2101 * This class is the root class of all resolution errors caused by
2102 * an invalid symbol being found during resolution.
2103 */
2104 abstract class InvalidSymbolError extends ResolveError {
2106 /** The invalid symbol found during resolution */
2107 Symbol sym;
2109 InvalidSymbolError(int kind, Symbol sym, String debugName) {
2110 super(kind, debugName);
2111 this.sym = sym;
2112 }
2114 @Override
2115 public boolean exists() {
2116 return true;
2117 }
2119 @Override
2120 public String toString() {
2121 return super.toString() + " wrongSym=" + sym;
2122 }
2124 @Override
2125 public Symbol access(Name name, TypeSymbol location) {
2126 if (sym.kind >= AMBIGUOUS)
2127 return ((ResolveError)sym).access(name, location);
2128 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
2129 return types.createErrorType(name, location, sym.type).tsym;
2130 else
2131 return sym;
2132 }
2133 }
2135 /**
2136 * InvalidSymbolError error class indicating that a symbol matching a
2137 * given name does not exists in a given site.
2138 */
2139 class SymbolNotFoundError extends ResolveError {
2141 SymbolNotFoundError(int kind) {
2142 super(kind, "symbol not found error");
2143 }
2145 @Override
2146 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2147 DiagnosticPosition pos,
2148 Symbol location,
2149 Type site,
2150 Name name,
2151 List<Type> argtypes,
2152 List<Type> typeargtypes) {
2153 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
2154 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
2155 if (name == names.error)
2156 return null;
2158 if (isOperator(name)) {
2159 boolean isUnaryOp = argtypes.size() == 1;
2160 String key = argtypes.size() == 1 ?
2161 "operator.cant.be.applied" :
2162 "operator.cant.be.applied.1";
2163 Type first = argtypes.head;
2164 Type second = !isUnaryOp ? argtypes.tail.head : null;
2165 return diags.create(dkind, log.currentSource(), pos,
2166 key, name, first, second);
2167 }
2168 boolean hasLocation = false;
2169 if (location == null) {
2170 location = site.tsym;
2171 }
2172 if (!location.name.isEmpty()) {
2173 if (location.kind == PCK && !site.tsym.exists()) {
2174 return diags.create(dkind, log.currentSource(), pos,
2175 "doesnt.exist", location);
2176 }
2177 hasLocation = !location.name.equals(names._this) &&
2178 !location.name.equals(names._super);
2179 }
2180 boolean isConstructor = kind == ABSENT_MTH &&
2181 name == names.table.names.init;
2182 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
2183 Name idname = isConstructor ? site.tsym.name : name;
2184 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
2185 if (hasLocation) {
2186 return diags.create(dkind, log.currentSource(), pos,
2187 errKey, kindname, idname, //symbol kindname, name
2188 typeargtypes, argtypes, //type parameters and arguments (if any)
2189 getLocationDiag(location, site)); //location kindname, type
2190 }
2191 else {
2192 return diags.create(dkind, log.currentSource(), pos,
2193 errKey, kindname, idname, //symbol kindname, name
2194 typeargtypes, argtypes); //type parameters and arguments (if any)
2195 }
2196 }
2197 //where
2198 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
2199 String key = "cant.resolve";
2200 String suffix = hasLocation ? ".location" : "";
2201 switch (kindname) {
2202 case METHOD:
2203 case CONSTRUCTOR: {
2204 suffix += ".args";
2205 suffix += hasTypeArgs ? ".params" : "";
2206 }
2207 }
2208 return key + suffix;
2209 }
2210 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
2211 if (location.kind == VAR) {
2212 return diags.fragment("location.1",
2213 kindName(location),
2214 location,
2215 location.type);
2216 } else {
2217 return diags.fragment("location",
2218 typeKindName(site),
2219 site,
2220 null);
2221 }
2222 }
2223 }
2225 /**
2226 * InvalidSymbolError error class indicating that a given symbol
2227 * (either a method, a constructor or an operand) is not applicable
2228 * given an actual arguments/type argument list.
2229 */
2230 class InapplicableSymbolError extends InvalidSymbolError {
2232 /** An auxiliary explanation set in case of instantiation errors. */
2233 JCDiagnostic explanation;
2235 InapplicableSymbolError(Symbol sym) {
2236 super(WRONG_MTH, sym, "inapplicable symbol error");
2237 }
2239 /** Update sym and explanation and return this.
2240 */
2241 InapplicableSymbolError setWrongSym(Symbol sym, JCDiagnostic explanation) {
2242 this.sym = sym;
2243 if (this.sym == sym && explanation != null)
2244 this.explanation = explanation; //update the details
2245 return this;
2246 }
2248 /** Update sym and return this.
2249 */
2250 InapplicableSymbolError setWrongSym(Symbol sym) {
2251 this.sym = sym;
2252 return this;
2253 }
2255 @Override
2256 public String toString() {
2257 return super.toString() + " explanation=" + explanation;
2258 }
2260 @Override
2261 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2262 DiagnosticPosition pos,
2263 Symbol location,
2264 Type site,
2265 Name name,
2266 List<Type> argtypes,
2267 List<Type> typeargtypes) {
2268 if (name == names.error)
2269 return null;
2271 if (isOperator(name)) {
2272 boolean isUnaryOp = argtypes.size() == 1;
2273 String key = argtypes.size() == 1 ?
2274 "operator.cant.be.applied" :
2275 "operator.cant.be.applied.1";
2276 Type first = argtypes.head;
2277 Type second = !isUnaryOp ? argtypes.tail.head : null;
2278 return diags.create(dkind, log.currentSource(), pos,
2279 key, name, first, second);
2280 }
2281 else {
2282 Symbol ws = sym.asMemberOf(site, types);
2283 return diags.create(dkind, log.currentSource(), pos,
2284 "cant.apply.symbol" + (explanation != null ? ".1" : ""),
2285 kindName(ws),
2286 ws.name == names.init ? ws.owner.name : ws.name,
2287 methodArguments(ws.type.getParameterTypes()),
2288 methodArguments(argtypes),
2289 kindName(ws.owner),
2290 ws.owner.type,
2291 explanation);
2292 }
2293 }
2295 void clear() {
2296 explanation = null;
2297 }
2299 @Override
2300 public Symbol access(Name name, TypeSymbol location) {
2301 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
2302 }
2303 }
2305 /**
2306 * ResolveError error class indicating that a set of symbols
2307 * (either methods, constructors or operands) is not applicable
2308 * given an actual arguments/type argument list.
2309 */
2310 class InapplicableSymbolsError extends ResolveError {
2312 private List<Candidate> candidates = List.nil();
2314 InapplicableSymbolsError(Symbol sym) {
2315 super(WRONG_MTHS, "inapplicable symbols");
2316 }
2318 @Override
2319 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2320 DiagnosticPosition pos,
2321 Symbol location,
2322 Type site,
2323 Name name,
2324 List<Type> argtypes,
2325 List<Type> typeargtypes) {
2326 if (candidates.nonEmpty()) {
2327 JCDiagnostic err = diags.create(dkind,
2328 log.currentSource(),
2329 pos,
2330 "cant.apply.symbols",
2331 name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
2332 getName(),
2333 argtypes);
2334 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(site));
2335 } else {
2336 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
2337 location, site, name, argtypes, typeargtypes);
2338 }
2339 }
2341 //where
2342 List<JCDiagnostic> candidateDetails(Type site) {
2343 List<JCDiagnostic> details = List.nil();
2344 for (Candidate c : candidates)
2345 details = details.prepend(c.getDiagnostic(site));
2346 return details.reverse();
2347 }
2349 Symbol addCandidate(MethodResolutionPhase currentStep, Symbol sym, JCDiagnostic details) {
2350 Candidate c = new Candidate(currentStep, sym, details);
2351 if (c.isValid() && !candidates.contains(c))
2352 candidates = candidates.append(c);
2353 return this;
2354 }
2356 void clear() {
2357 candidates = List.nil();
2358 }
2360 private Name getName() {
2361 Symbol sym = candidates.head.sym;
2362 return sym.name == names.init ?
2363 sym.owner.name :
2364 sym.name;
2365 }
2367 private class Candidate {
2369 final MethodResolutionPhase step;
2370 final Symbol sym;
2371 final JCDiagnostic details;
2373 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details) {
2374 this.step = step;
2375 this.sym = sym;
2376 this.details = details;
2377 }
2379 JCDiagnostic getDiagnostic(Type site) {
2380 return diags.fragment("inapplicable.method",
2381 Kinds.kindName(sym),
2382 sym.location(site, types),
2383 sym.asMemberOf(site, types),
2384 details);
2385 }
2387 @Override
2388 public boolean equals(Object o) {
2389 if (o instanceof Candidate) {
2390 Symbol s1 = this.sym;
2391 Symbol s2 = ((Candidate)o).sym;
2392 if ((s1 != s2 &&
2393 (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
2394 (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
2395 ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
2396 return true;
2397 }
2398 return false;
2399 }
2401 boolean isValid() {
2402 return (((sym.flags() & VARARGS) != 0 && step == VARARITY) ||
2403 (sym.flags() & VARARGS) == 0 && step == (boxingEnabled ? BOX : BASIC));
2404 }
2405 }
2406 }
2408 /**
2409 * An InvalidSymbolError error class indicating that a symbol is not
2410 * accessible from a given site
2411 */
2412 class AccessError extends InvalidSymbolError {
2414 private Env<AttrContext> env;
2415 private Type site;
2417 AccessError(Symbol sym) {
2418 this(null, null, sym);
2419 }
2421 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
2422 super(HIDDEN, sym, "access error");
2423 this.env = env;
2424 this.site = site;
2425 if (debugResolve)
2426 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
2427 }
2429 @Override
2430 public boolean exists() {
2431 return false;
2432 }
2434 @Override
2435 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2436 DiagnosticPosition pos,
2437 Symbol location,
2438 Type site,
2439 Name name,
2440 List<Type> argtypes,
2441 List<Type> typeargtypes) {
2442 if (sym.owner.type.tag == ERROR)
2443 return null;
2445 if (sym.name == names.init && sym.owner != site.tsym) {
2446 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
2447 pos, location, site, name, argtypes, typeargtypes);
2448 }
2449 else if ((sym.flags() & PUBLIC) != 0
2450 || (env != null && this.site != null
2451 && !isAccessible(env, this.site))) {
2452 return diags.create(dkind, log.currentSource(),
2453 pos, "not.def.access.class.intf.cant.access",
2454 sym, sym.location());
2455 }
2456 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
2457 return diags.create(dkind, log.currentSource(),
2458 pos, "report.access", sym,
2459 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
2460 sym.location());
2461 }
2462 else {
2463 return diags.create(dkind, log.currentSource(),
2464 pos, "not.def.public.cant.access", sym, sym.location());
2465 }
2466 }
2467 }
2469 /**
2470 * InvalidSymbolError error class indicating that an instance member
2471 * has erroneously been accessed from a static context.
2472 */
2473 class StaticError extends InvalidSymbolError {
2475 StaticError(Symbol sym) {
2476 super(STATICERR, sym, "static error");
2477 }
2479 @Override
2480 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2481 DiagnosticPosition pos,
2482 Symbol location,
2483 Type site,
2484 Name name,
2485 List<Type> argtypes,
2486 List<Type> typeargtypes) {
2487 Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
2488 ? types.erasure(sym.type).tsym
2489 : sym);
2490 return diags.create(dkind, log.currentSource(), pos,
2491 "non-static.cant.be.ref", kindName(sym), errSym);
2492 }
2493 }
2495 /**
2496 * InvalidSymbolError error class indicating that a pair of symbols
2497 * (either methods, constructors or operands) are ambiguous
2498 * given an actual arguments/type argument list.
2499 */
2500 class AmbiguityError extends InvalidSymbolError {
2502 /** The other maximally specific symbol */
2503 Symbol sym2;
2505 AmbiguityError(Symbol sym1, Symbol sym2) {
2506 super(AMBIGUOUS, sym1, "ambiguity error");
2507 this.sym2 = sym2;
2508 }
2510 @Override
2511 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2512 DiagnosticPosition pos,
2513 Symbol location,
2514 Type site,
2515 Name name,
2516 List<Type> argtypes,
2517 List<Type> typeargtypes) {
2518 AmbiguityError pair = this;
2519 while (true) {
2520 if (pair.sym.kind == AMBIGUOUS)
2521 pair = (AmbiguityError)pair.sym;
2522 else if (pair.sym2.kind == AMBIGUOUS)
2523 pair = (AmbiguityError)pair.sym2;
2524 else break;
2525 }
2526 Name sname = pair.sym.name;
2527 if (sname == names.init) sname = pair.sym.owner.name;
2528 return diags.create(dkind, log.currentSource(),
2529 pos, "ref.ambiguous", sname,
2530 kindName(pair.sym),
2531 pair.sym,
2532 pair.sym.location(site, types),
2533 kindName(pair.sym2),
2534 pair.sym2,
2535 pair.sym2.location(site, types));
2536 }
2537 }
2539 enum MethodResolutionPhase {
2540 BASIC(false, false),
2541 BOX(true, false),
2542 VARARITY(true, true);
2544 boolean isBoxingRequired;
2545 boolean isVarargsRequired;
2547 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
2548 this.isBoxingRequired = isBoxingRequired;
2549 this.isVarargsRequired = isVarargsRequired;
2550 }
2552 public boolean isBoxingRequired() {
2553 return isBoxingRequired;
2554 }
2556 public boolean isVarargsRequired() {
2557 return isVarargsRequired;
2558 }
2560 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
2561 return (varargsEnabled || !isVarargsRequired) &&
2562 (boxingEnabled || !isBoxingRequired);
2563 }
2564 }
2566 private Map<MethodResolutionPhase, Symbol> methodResolutionCache =
2567 new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length);
2569 private Map<Symbol, JCDiagnostic> verboseResolutionCandidateDiags =
2570 new LinkedHashMap<Symbol, JCDiagnostic>();
2572 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
2574 private MethodResolutionPhase currentStep = null;
2576 private boolean internalResolution = false;
2578 private MethodResolutionPhase firstErroneousResolutionPhase() {
2579 MethodResolutionPhase bestSoFar = BASIC;
2580 Symbol sym = methodNotFound;
2581 List<MethodResolutionPhase> steps = methodResolutionSteps;
2582 while (steps.nonEmpty() &&
2583 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
2584 sym.kind >= WRONG_MTHS) {
2585 sym = methodResolutionCache.get(steps.head);
2586 bestSoFar = steps.head;
2587 steps = steps.tail;
2588 }
2589 return bestSoFar;
2590 }
2591 }
