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src/share/classes/com/sun/tools/javac/comp/Resolve.java@62f3f07002ea
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Thu, 29 Jul 2010 15:57:43 +0100
- author
- mcimadamore
- date
- Thu, 29 Jul 2010 15:57:43 +0100
- changeset 617
- 62f3f07002ea
- parent 612
- d1bd93028447
- child 631
- a2d8c7071f24
- permissions
- -rw-r--r--
6970833: Try-with-resource implementation throws an NPE during Flow analysis
Summary: Updated logic not to rely upon Symbol.implementation (which check in superinterfaces)
Reviewed-by: jjg
1 /*
2 * Copyright (c) 1999, 2008, 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.util.*;
29 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
30 import com.sun.tools.javac.code.*;
31 import com.sun.tools.javac.jvm.*;
32 import com.sun.tools.javac.tree.*;
33 import com.sun.tools.javac.api.Formattable.LocalizedString;
34 import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
36 import com.sun.tools.javac.code.Type.*;
37 import com.sun.tools.javac.code.Symbol.*;
38 import com.sun.tools.javac.tree.JCTree.*;
40 import static com.sun.tools.javac.code.Flags.*;
41 import static com.sun.tools.javac.code.Kinds.*;
42 import static com.sun.tools.javac.code.TypeTags.*;
43 import javax.lang.model.element.ElementVisitor;
45 import java.util.Map;
46 import java.util.HashMap;
48 /** Helper class for name resolution, used mostly by the attribution phase.
49 *
50 * <p><b>This is NOT part of any supported API.
51 * If you write code that depends on this, you do so at your own risk.
52 * This code and its internal interfaces are subject to change or
53 * deletion without notice.</b>
54 */
55 public class Resolve {
56 protected static final Context.Key<Resolve> resolveKey =
57 new Context.Key<Resolve>();
59 Names names;
60 Log log;
61 Symtab syms;
62 Check chk;
63 Infer infer;
64 ClassReader reader;
65 TreeInfo treeinfo;
66 Types types;
67 JCDiagnostic.Factory diags;
68 public final boolean boxingEnabled; // = source.allowBoxing();
69 public final boolean varargsEnabled; // = source.allowVarargs();
70 public final boolean allowPolymorphicSignature;
71 private final boolean debugResolve;
73 public static Resolve instance(Context context) {
74 Resolve instance = context.get(resolveKey);
75 if (instance == null)
76 instance = new Resolve(context);
77 return instance;
78 }
80 protected Resolve(Context context) {
81 context.put(resolveKey, this);
82 syms = Symtab.instance(context);
84 varNotFound = new
85 SymbolNotFoundError(ABSENT_VAR);
86 wrongMethod = new
87 InapplicableSymbolError(syms.errSymbol);
88 wrongMethods = new
89 InapplicableSymbolsError(syms.errSymbol);
90 methodNotFound = new
91 SymbolNotFoundError(ABSENT_MTH);
92 typeNotFound = new
93 SymbolNotFoundError(ABSENT_TYP);
95 names = Names.instance(context);
96 log = Log.instance(context);
97 chk = Check.instance(context);
98 infer = Infer.instance(context);
99 reader = ClassReader.instance(context);
100 treeinfo = TreeInfo.instance(context);
101 types = Types.instance(context);
102 diags = JCDiagnostic.Factory.instance(context);
103 Source source = Source.instance(context);
104 boxingEnabled = source.allowBoxing();
105 varargsEnabled = source.allowVarargs();
106 Options options = Options.instance(context);
107 debugResolve = options.get("debugresolve") != null;
108 allowPolymorphicSignature = source.allowPolymorphicSignature() || options.get("invokedynamic") != null;
109 }
111 /** error symbols, which are returned when resolution fails
112 */
113 final SymbolNotFoundError varNotFound;
114 final InapplicableSymbolError wrongMethod;
115 final InapplicableSymbolsError wrongMethods;
116 final SymbolNotFoundError methodNotFound;
117 final SymbolNotFoundError typeNotFound;
119 /* ************************************************************************
120 * Identifier resolution
121 *************************************************************************/
123 /** An environment is "static" if its static level is greater than
124 * the one of its outer environment
125 */
126 static boolean isStatic(Env<AttrContext> env) {
127 return env.info.staticLevel > env.outer.info.staticLevel;
128 }
130 /** An environment is an "initializer" if it is a constructor or
131 * an instance initializer.
132 */
133 static boolean isInitializer(Env<AttrContext> env) {
134 Symbol owner = env.info.scope.owner;
135 return owner.isConstructor() ||
136 owner.owner.kind == TYP &&
137 (owner.kind == VAR ||
138 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
139 (owner.flags() & STATIC) == 0;
140 }
142 /** Is class accessible in given evironment?
143 * @param env The current environment.
144 * @param c The class whose accessibility is checked.
145 */
146 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
147 switch ((short)(c.flags() & AccessFlags)) {
148 case PRIVATE:
149 return
150 env.enclClass.sym.outermostClass() ==
151 c.owner.outermostClass();
152 case 0:
153 return
154 env.toplevel.packge == c.owner // fast special case
155 ||
156 env.toplevel.packge == c.packge()
157 ||
158 // Hack: this case is added since synthesized default constructors
159 // of anonymous classes should be allowed to access
160 // classes which would be inaccessible otherwise.
161 env.enclMethod != null &&
162 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
163 default: // error recovery
164 case PUBLIC:
165 return true;
166 case PROTECTED:
167 return
168 env.toplevel.packge == c.owner // fast special case
169 ||
170 env.toplevel.packge == c.packge()
171 ||
172 isInnerSubClass(env.enclClass.sym, c.owner);
173 }
174 }
175 //where
176 /** Is given class a subclass of given base class, or an inner class
177 * of a subclass?
178 * Return null if no such class exists.
179 * @param c The class which is the subclass or is contained in it.
180 * @param base The base class
181 */
182 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
183 while (c != null && !c.isSubClass(base, types)) {
184 c = c.owner.enclClass();
185 }
186 return c != null;
187 }
189 boolean isAccessible(Env<AttrContext> env, Type t) {
190 return (t.tag == ARRAY)
191 ? isAccessible(env, types.elemtype(t))
192 : isAccessible(env, t.tsym);
193 }
195 /** Is symbol accessible as a member of given type in given evironment?
196 * @param env The current environment.
197 * @param site The type of which the tested symbol is regarded
198 * as a member.
199 * @param sym The symbol.
200 */
201 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
202 if (sym.name == names.init && sym.owner != site.tsym) return false;
203 ClassSymbol sub;
204 switch ((short)(sym.flags() & AccessFlags)) {
205 case PRIVATE:
206 return
207 (env.enclClass.sym == sym.owner // fast special case
208 ||
209 env.enclClass.sym.outermostClass() ==
210 sym.owner.outermostClass())
211 &&
212 sym.isInheritedIn(site.tsym, types);
213 case 0:
214 return
215 (env.toplevel.packge == sym.owner.owner // fast special case
216 ||
217 env.toplevel.packge == sym.packge())
218 &&
219 isAccessible(env, site)
220 &&
221 sym.isInheritedIn(site.tsym, types)
222 &&
223 notOverriddenIn(site, sym);
224 case PROTECTED:
225 return
226 (env.toplevel.packge == sym.owner.owner // fast special case
227 ||
228 env.toplevel.packge == sym.packge()
229 ||
230 isProtectedAccessible(sym, env.enclClass.sym, site)
231 ||
232 // OK to select instance method or field from 'super' or type name
233 // (but type names should be disallowed elsewhere!)
234 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
235 &&
236 isAccessible(env, site)
237 &&
238 notOverriddenIn(site, sym);
239 default: // this case includes erroneous combinations as well
240 return isAccessible(env, site) && notOverriddenIn(site, sym);
241 }
242 }
243 //where
244 /* `sym' is accessible only if not overridden by
245 * another symbol which is a member of `site'
246 * (because, if it is overridden, `sym' is not strictly
247 * speaking a member of `site'.)
248 */
249 private boolean notOverriddenIn(Type site, Symbol sym) {
250 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
251 return true;
252 else {
253 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
254 return (s2 == null || s2 == sym ||
255 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
256 }
257 }
258 //where
259 /** Is given protected symbol accessible if it is selected from given site
260 * and the selection takes place in given class?
261 * @param sym The symbol with protected access
262 * @param c The class where the access takes place
263 * @site The type of the qualifier
264 */
265 private
266 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
267 while (c != null &&
268 !(c.isSubClass(sym.owner, types) &&
269 (c.flags() & INTERFACE) == 0 &&
270 // In JLS 2e 6.6.2.1, the subclass restriction applies
271 // only to instance fields and methods -- types are excluded
272 // regardless of whether they are declared 'static' or not.
273 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
274 c = c.owner.enclClass();
275 return c != null;
276 }
278 /** Try to instantiate the type of a method so that it fits
279 * given type arguments and argument types. If succesful, return
280 * the method's instantiated type, else return null.
281 * The instantiation will take into account an additional leading
282 * formal parameter if the method is an instance method seen as a member
283 * of un underdetermined site In this case, we treat site as an additional
284 * parameter and the parameters of the class containing the method as
285 * additional type variables that get instantiated.
286 *
287 * @param env The current environment
288 * @param site The type of which the method is a member.
289 * @param m The method symbol.
290 * @param argtypes The invocation's given value arguments.
291 * @param typeargtypes The invocation's given type arguments.
292 * @param allowBoxing Allow boxing conversions of arguments.
293 * @param useVarargs Box trailing arguments into an array for varargs.
294 */
295 Type rawInstantiate(Env<AttrContext> env,
296 Type site,
297 Symbol m,
298 List<Type> argtypes,
299 List<Type> typeargtypes,
300 boolean allowBoxing,
301 boolean useVarargs,
302 Warner warn)
303 throws Infer.InferenceException {
304 assert ((m.flags() & (POLYMORPHIC_SIGNATURE|HYPOTHETICAL)) != POLYMORPHIC_SIGNATURE);
305 if (useVarargs && (m.flags() & VARARGS) == 0) return null;
306 Type mt = types.memberType(site, m);
308 // tvars is the list of formal type variables for which type arguments
309 // need to inferred.
310 List<Type> tvars = env.info.tvars;
311 if (typeargtypes == null) typeargtypes = List.nil();
312 if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
313 // This is not a polymorphic method, but typeargs are supplied
314 // which is fine, see JLS3 15.12.2.1
315 } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
316 ForAll pmt = (ForAll) mt;
317 if (typeargtypes.length() != pmt.tvars.length())
318 return null;
319 // Check type arguments are within bounds
320 List<Type> formals = pmt.tvars;
321 List<Type> actuals = typeargtypes;
322 while (formals.nonEmpty() && actuals.nonEmpty()) {
323 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
324 pmt.tvars, typeargtypes);
325 for (; bounds.nonEmpty(); bounds = bounds.tail)
326 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
327 return null;
328 formals = formals.tail;
329 actuals = actuals.tail;
330 }
331 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
332 } else if (mt.tag == FORALL) {
333 ForAll pmt = (ForAll) mt;
334 List<Type> tvars1 = types.newInstances(pmt.tvars);
335 tvars = tvars.appendList(tvars1);
336 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
337 }
339 // find out whether we need to go the slow route via infer
340 boolean instNeeded = tvars.tail != null/*inlined: tvars.nonEmpty()*/;
341 for (List<Type> l = argtypes;
342 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
343 l = l.tail) {
344 if (l.head.tag == FORALL) instNeeded = true;
345 }
347 if (instNeeded)
348 return
349 infer.instantiateMethod(env,
350 tvars,
351 (MethodType)mt,
352 m,
353 argtypes,
354 allowBoxing,
355 useVarargs,
356 warn);
357 return
358 argumentsAcceptable(argtypes, mt.getParameterTypes(),
359 allowBoxing, useVarargs, warn)
360 ? mt
361 : null;
362 }
364 /** Same but returns null instead throwing a NoInstanceException
365 */
366 Type instantiate(Env<AttrContext> env,
367 Type site,
368 Symbol m,
369 List<Type> argtypes,
370 List<Type> typeargtypes,
371 boolean allowBoxing,
372 boolean useVarargs,
373 Warner warn) {
374 try {
375 return rawInstantiate(env, site, m, argtypes, typeargtypes,
376 allowBoxing, useVarargs, warn);
377 } catch (Infer.InferenceException ex) {
378 return null;
379 }
380 }
382 /** Check if a parameter list accepts a list of args.
383 */
384 boolean argumentsAcceptable(List<Type> argtypes,
385 List<Type> formals,
386 boolean allowBoxing,
387 boolean useVarargs,
388 Warner warn) {
389 Type varargsFormal = useVarargs ? formals.last() : null;
390 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
391 boolean works = allowBoxing
392 ? types.isConvertible(argtypes.head, formals.head, warn)
393 : types.isSubtypeUnchecked(argtypes.head, formals.head, warn);
394 if (!works) return false;
395 argtypes = argtypes.tail;
396 formals = formals.tail;
397 }
398 if (formals.head != varargsFormal) return false; // not enough args
399 if (!useVarargs)
400 return argtypes.isEmpty();
401 Type elt = types.elemtype(varargsFormal);
402 while (argtypes.nonEmpty()) {
403 if (!types.isConvertible(argtypes.head, elt, warn))
404 return false;
405 argtypes = argtypes.tail;
406 }
407 return true;
408 }
410 /* ***************************************************************************
411 * Symbol lookup
412 * the following naming conventions for arguments are used
413 *
414 * env is the environment where the symbol was mentioned
415 * site is the type of which the symbol is a member
416 * name is the symbol's name
417 * if no arguments are given
418 * argtypes are the value arguments, if we search for a method
419 *
420 * If no symbol was found, a ResolveError detailing the problem is returned.
421 ****************************************************************************/
423 /** Find field. Synthetic fields are always skipped.
424 * @param env The current environment.
425 * @param site The original type from where the selection takes place.
426 * @param name The name of the field.
427 * @param c The class to search for the field. This is always
428 * a superclass or implemented interface of site's class.
429 */
430 Symbol findField(Env<AttrContext> env,
431 Type site,
432 Name name,
433 TypeSymbol c) {
434 while (c.type.tag == TYPEVAR)
435 c = c.type.getUpperBound().tsym;
436 Symbol bestSoFar = varNotFound;
437 Symbol sym;
438 Scope.Entry e = c.members().lookup(name);
439 while (e.scope != null) {
440 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
441 return isAccessible(env, site, e.sym)
442 ? e.sym : new AccessError(env, site, e.sym);
443 }
444 e = e.next();
445 }
446 Type st = types.supertype(c.type);
447 if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
448 sym = findField(env, site, name, st.tsym);
449 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
450 }
451 for (List<Type> l = types.interfaces(c.type);
452 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
453 l = l.tail) {
454 sym = findField(env, site, name, l.head.tsym);
455 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
456 sym.owner != bestSoFar.owner)
457 bestSoFar = new AmbiguityError(bestSoFar, sym);
458 else if (sym.kind < bestSoFar.kind)
459 bestSoFar = sym;
460 }
461 return bestSoFar;
462 }
464 /** Resolve a field identifier, throw a fatal error if not found.
465 * @param pos The position to use for error reporting.
466 * @param env The environment current at the method invocation.
467 * @param site The type of the qualifying expression, in which
468 * identifier is searched.
469 * @param name The identifier's name.
470 */
471 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
472 Type site, Name name) {
473 Symbol sym = findField(env, site, name, site.tsym);
474 if (sym.kind == VAR) return (VarSymbol)sym;
475 else throw new FatalError(
476 diags.fragment("fatal.err.cant.locate.field",
477 name));
478 }
480 /** Find unqualified variable or field with given name.
481 * Synthetic fields always skipped.
482 * @param env The current environment.
483 * @param name The name of the variable or field.
484 */
485 Symbol findVar(Env<AttrContext> env, Name name) {
486 Symbol bestSoFar = varNotFound;
487 Symbol sym;
488 Env<AttrContext> env1 = env;
489 boolean staticOnly = false;
490 while (env1.outer != null) {
491 if (isStatic(env1)) staticOnly = true;
492 Scope.Entry e = env1.info.scope.lookup(name);
493 while (e.scope != null &&
494 (e.sym.kind != VAR ||
495 (e.sym.flags_field & SYNTHETIC) != 0))
496 e = e.next();
497 sym = (e.scope != null)
498 ? e.sym
499 : findField(
500 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
501 if (sym.exists()) {
502 if (staticOnly &&
503 sym.kind == VAR &&
504 sym.owner.kind == TYP &&
505 (sym.flags() & STATIC) == 0)
506 return new StaticError(sym);
507 else
508 return sym;
509 } else if (sym.kind < bestSoFar.kind) {
510 bestSoFar = sym;
511 }
513 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
514 env1 = env1.outer;
515 }
517 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
518 if (sym.exists())
519 return sym;
520 if (bestSoFar.exists())
521 return bestSoFar;
523 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
524 for (; e.scope != null; e = e.next()) {
525 sym = e.sym;
526 Type origin = e.getOrigin().owner.type;
527 if (sym.kind == VAR) {
528 if (e.sym.owner.type != origin)
529 sym = sym.clone(e.getOrigin().owner);
530 return isAccessible(env, origin, sym)
531 ? sym : new AccessError(env, origin, sym);
532 }
533 }
535 Symbol origin = null;
536 e = env.toplevel.starImportScope.lookup(name);
537 for (; e.scope != null; e = e.next()) {
538 sym = e.sym;
539 if (sym.kind != VAR)
540 continue;
541 // invariant: sym.kind == VAR
542 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
543 return new AmbiguityError(bestSoFar, sym);
544 else if (bestSoFar.kind >= VAR) {
545 origin = e.getOrigin().owner;
546 bestSoFar = isAccessible(env, origin.type, sym)
547 ? sym : new AccessError(env, origin.type, sym);
548 }
549 }
550 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
551 return bestSoFar.clone(origin);
552 else
553 return bestSoFar;
554 }
556 Warner noteWarner = new Warner();
558 /** Select the best method for a call site among two choices.
559 * @param env The current environment.
560 * @param site The original type from where the
561 * selection takes place.
562 * @param argtypes The invocation's value arguments,
563 * @param typeargtypes The invocation's type arguments,
564 * @param sym Proposed new best match.
565 * @param bestSoFar Previously found best match.
566 * @param allowBoxing Allow boxing conversions of arguments.
567 * @param useVarargs Box trailing arguments into an array for varargs.
568 */
569 Symbol selectBest(Env<AttrContext> env,
570 Type site,
571 List<Type> argtypes,
572 List<Type> typeargtypes,
573 Symbol sym,
574 Symbol bestSoFar,
575 boolean allowBoxing,
576 boolean useVarargs,
577 boolean operator) {
578 if (sym.kind == ERR) return bestSoFar;
579 if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
580 assert sym.kind < AMBIGUOUS;
581 if ((sym.flags() & POLYMORPHIC_SIGNATURE) != 0 && allowPolymorphicSignature) {
582 assert(site.tag == CLASS);
583 // Never match a MethodHandle.invoke directly.
584 if (useVarargs | allowBoxing | operator)
585 return bestSoFar;
586 // Supply an exactly-typed implicit method instead.
587 sym = findPolymorphicSignatureInstance(env, sym.owner.type, sym.name, (MethodSymbol) sym, argtypes, typeargtypes);
588 }
589 try {
590 if (rawInstantiate(env, site, sym, argtypes, typeargtypes,
591 allowBoxing, useVarargs, Warner.noWarnings) == null) {
592 // inapplicable
593 switch (bestSoFar.kind) {
594 case ABSENT_MTH: return wrongMethod.setWrongSym(sym);
595 case WRONG_MTH: return wrongMethods;
596 default: return bestSoFar;
597 }
598 }
599 } catch (Infer.InferenceException ex) {
600 switch (bestSoFar.kind) {
601 case ABSENT_MTH:
602 return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
603 case WRONG_MTH:
604 return wrongMethods;
605 default:
606 return bestSoFar;
607 }
608 }
609 if (!isAccessible(env, site, sym)) {
610 return (bestSoFar.kind == ABSENT_MTH)
611 ? new AccessError(env, site, sym)
612 : bestSoFar;
613 }
614 return (bestSoFar.kind > AMBIGUOUS)
615 ? sym
616 : mostSpecific(sym, bestSoFar, env, site,
617 allowBoxing && operator, useVarargs);
618 }
620 /* Return the most specific of the two methods for a call,
621 * given that both are accessible and applicable.
622 * @param m1 A new candidate for most specific.
623 * @param m2 The previous most specific candidate.
624 * @param env The current environment.
625 * @param site The original type from where the selection
626 * takes place.
627 * @param allowBoxing Allow boxing conversions of arguments.
628 * @param useVarargs Box trailing arguments into an array for varargs.
629 */
630 Symbol mostSpecific(Symbol m1,
631 Symbol m2,
632 Env<AttrContext> env,
633 final Type site,
634 boolean allowBoxing,
635 boolean useVarargs) {
636 switch (m2.kind) {
637 case MTH:
638 if (m1 == m2) return m1;
639 Type mt1 = types.memberType(site, m1);
640 noteWarner.unchecked = false;
641 boolean m1SignatureMoreSpecific =
642 (instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
643 allowBoxing, false, noteWarner) != null ||
644 useVarargs && instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
645 allowBoxing, true, noteWarner) != null) &&
646 !noteWarner.unchecked;
647 Type mt2 = types.memberType(site, m2);
648 noteWarner.unchecked = false;
649 boolean m2SignatureMoreSpecific =
650 (instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
651 allowBoxing, false, noteWarner) != null ||
652 useVarargs && instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
653 allowBoxing, true, noteWarner) != null) &&
654 !noteWarner.unchecked;
655 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
656 if (!types.overrideEquivalent(mt1, mt2))
657 return new AmbiguityError(m1, m2);
658 // same signature; select (a) the non-bridge method, or
659 // (b) the one that overrides the other, or (c) the concrete
660 // one, or (d) merge both abstract signatures
661 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE)) {
662 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
663 }
664 // if one overrides or hides the other, use it
665 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
666 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
667 if (types.asSuper(m1Owner.type, m2Owner) != null &&
668 ((m1.owner.flags_field & INTERFACE) == 0 ||
669 (m2.owner.flags_field & INTERFACE) != 0) &&
670 m1.overrides(m2, m1Owner, types, false))
671 return m1;
672 if (types.asSuper(m2Owner.type, m1Owner) != null &&
673 ((m2.owner.flags_field & INTERFACE) == 0 ||
674 (m1.owner.flags_field & INTERFACE) != 0) &&
675 m2.overrides(m1, m2Owner, types, false))
676 return m2;
677 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
678 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
679 if (m1Abstract && !m2Abstract) return m2;
680 if (m2Abstract && !m1Abstract) return m1;
681 // both abstract or both concrete
682 if (!m1Abstract && !m2Abstract)
683 return new AmbiguityError(m1, m2);
684 // check that both signatures have the same erasure
685 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
686 m2.erasure(types).getParameterTypes()))
687 return new AmbiguityError(m1, m2);
688 // both abstract, neither overridden; merge throws clause and result type
689 Symbol mostSpecific;
690 Type result2 = mt2.getReturnType();
691 if (mt2.tag == FORALL)
692 result2 = types.subst(result2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
693 if (types.isSubtype(mt1.getReturnType(), result2)) {
694 mostSpecific = m1;
695 } else if (types.isSubtype(result2, mt1.getReturnType())) {
696 mostSpecific = m2;
697 } else {
698 // Theoretically, this can't happen, but it is possible
699 // due to error recovery or mixing incompatible class files
700 return new AmbiguityError(m1, m2);
701 }
702 MethodSymbol result = new MethodSymbol(
703 mostSpecific.flags(),
704 mostSpecific.name,
705 null,
706 mostSpecific.owner) {
707 @Override
708 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
709 if (origin == site.tsym)
710 return this;
711 else
712 return super.implementation(origin, types, checkResult);
713 }
714 };
715 result.type = (Type)mostSpecific.type.clone();
716 result.type.setThrown(chk.intersect(mt1.getThrownTypes(),
717 mt2.getThrownTypes()));
718 return result;
719 }
720 if (m1SignatureMoreSpecific) return m1;
721 if (m2SignatureMoreSpecific) return m2;
722 return new AmbiguityError(m1, m2);
723 case AMBIGUOUS:
724 AmbiguityError e = (AmbiguityError)m2;
725 Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
726 Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
727 if (err1 == err2) return err1;
728 if (err1 == e.sym && err2 == e.sym2) return m2;
729 if (err1 instanceof AmbiguityError &&
730 err2 instanceof AmbiguityError &&
731 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
732 return new AmbiguityError(m1, m2);
733 else
734 return new AmbiguityError(err1, err2);
735 default:
736 throw new AssertionError();
737 }
738 }
740 /** Find best qualified method matching given name, type and value
741 * arguments.
742 * @param env The current environment.
743 * @param site The original type from where the selection
744 * takes place.
745 * @param name The method's name.
746 * @param argtypes The method's value arguments.
747 * @param typeargtypes The method's type arguments
748 * @param allowBoxing Allow boxing conversions of arguments.
749 * @param useVarargs Box trailing arguments into an array for varargs.
750 */
751 Symbol findMethod(Env<AttrContext> env,
752 Type site,
753 Name name,
754 List<Type> argtypes,
755 List<Type> typeargtypes,
756 boolean allowBoxing,
757 boolean useVarargs,
758 boolean operator) {
759 Symbol bestSoFar = methodNotFound;
760 if ((site.tsym.flags() & POLYMORPHIC_SIGNATURE) != 0 &&
761 allowPolymorphicSignature &&
762 site.tag == CLASS &&
763 !(useVarargs | allowBoxing | operator)) {
764 // supply an exactly-typed implicit method in java.dyn.InvokeDynamic
765 bestSoFar = findPolymorphicSignatureInstance(env, site, name, null, argtypes, typeargtypes);
766 }
767 return findMethod(env,
768 site,
769 name,
770 argtypes,
771 typeargtypes,
772 site.tsym.type,
773 true,
774 bestSoFar,
775 allowBoxing,
776 useVarargs,
777 operator);
778 }
779 // where
780 private Symbol findMethod(Env<AttrContext> env,
781 Type site,
782 Name name,
783 List<Type> argtypes,
784 List<Type> typeargtypes,
785 Type intype,
786 boolean abstractok,
787 Symbol bestSoFar,
788 boolean allowBoxing,
789 boolean useVarargs,
790 boolean operator) {
791 for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
792 while (ct.tag == TYPEVAR)
793 ct = ct.getUpperBound();
794 ClassSymbol c = (ClassSymbol)ct.tsym;
795 if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
796 abstractok = false;
797 for (Scope.Entry e = c.members().lookup(name);
798 e.scope != null;
799 e = e.next()) {
800 //- System.out.println(" e " + e.sym);
801 if (e.sym.kind == MTH &&
802 (e.sym.flags_field & SYNTHETIC) == 0) {
803 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
804 e.sym, bestSoFar,
805 allowBoxing,
806 useVarargs,
807 operator);
808 }
809 }
810 if (name == names.init)
811 break;
812 //- System.out.println(" - " + bestSoFar);
813 if (abstractok) {
814 Symbol concrete = methodNotFound;
815 if ((bestSoFar.flags() & ABSTRACT) == 0)
816 concrete = bestSoFar;
817 for (List<Type> l = types.interfaces(c.type);
818 l.nonEmpty();
819 l = l.tail) {
820 bestSoFar = findMethod(env, site, name, argtypes,
821 typeargtypes,
822 l.head, abstractok, bestSoFar,
823 allowBoxing, useVarargs, operator);
824 }
825 if (concrete != bestSoFar &&
826 concrete.kind < ERR && bestSoFar.kind < ERR &&
827 types.isSubSignature(concrete.type, bestSoFar.type))
828 bestSoFar = concrete;
829 }
830 }
831 return bestSoFar;
832 }
834 /** Find unqualified method matching given name, type and value arguments.
835 * @param env The current environment.
836 * @param name The method's name.
837 * @param argtypes The method's value arguments.
838 * @param typeargtypes The method's type arguments.
839 * @param allowBoxing Allow boxing conversions of arguments.
840 * @param useVarargs Box trailing arguments into an array for varargs.
841 */
842 Symbol findFun(Env<AttrContext> env, Name name,
843 List<Type> argtypes, List<Type> typeargtypes,
844 boolean allowBoxing, boolean useVarargs) {
845 Symbol bestSoFar = methodNotFound;
846 Symbol sym;
847 Env<AttrContext> env1 = env;
848 boolean staticOnly = false;
849 while (env1.outer != null) {
850 if (isStatic(env1)) staticOnly = true;
851 sym = findMethod(
852 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
853 allowBoxing, useVarargs, false);
854 if (sym.exists()) {
855 if (staticOnly &&
856 sym.kind == MTH &&
857 sym.owner.kind == TYP &&
858 (sym.flags() & STATIC) == 0) return new StaticError(sym);
859 else return sym;
860 } else if (sym.kind < bestSoFar.kind) {
861 bestSoFar = sym;
862 }
863 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
864 env1 = env1.outer;
865 }
867 sym = findMethod(env, syms.predefClass.type, name, argtypes,
868 typeargtypes, allowBoxing, useVarargs, false);
869 if (sym.exists())
870 return sym;
872 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
873 for (; e.scope != null; e = e.next()) {
874 sym = e.sym;
875 Type origin = e.getOrigin().owner.type;
876 if (sym.kind == MTH) {
877 if (e.sym.owner.type != origin)
878 sym = sym.clone(e.getOrigin().owner);
879 if (!isAccessible(env, origin, sym))
880 sym = new AccessError(env, origin, sym);
881 bestSoFar = selectBest(env, origin,
882 argtypes, typeargtypes,
883 sym, bestSoFar,
884 allowBoxing, useVarargs, false);
885 }
886 }
887 if (bestSoFar.exists())
888 return bestSoFar;
890 e = env.toplevel.starImportScope.lookup(name);
891 for (; e.scope != null; e = e.next()) {
892 sym = e.sym;
893 Type origin = e.getOrigin().owner.type;
894 if (sym.kind == MTH) {
895 if (e.sym.owner.type != origin)
896 sym = sym.clone(e.getOrigin().owner);
897 if (!isAccessible(env, origin, sym))
898 sym = new AccessError(env, origin, sym);
899 bestSoFar = selectBest(env, origin,
900 argtypes, typeargtypes,
901 sym, bestSoFar,
902 allowBoxing, useVarargs, false);
903 }
904 }
905 return bestSoFar;
906 }
908 /** Find or create an implicit method of exactly the given type (after erasure).
909 * Searches in a side table, not the main scope of the site.
910 * This emulates the lookup process required by JSR 292 in JVM.
911 * @param env The current environment.
912 * @param site The original type from where the selection
913 * takes place.
914 * @param name The method's name.
915 * @param argtypes The method's value arguments.
916 * @param typeargtypes The method's type arguments
917 */
918 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
919 Type site,
920 Name name,
921 MethodSymbol spMethod, // sig. poly. method or null if none
922 List<Type> argtypes,
923 List<Type> typeargtypes) {
924 assert allowPolymorphicSignature;
925 //assert site == syms.invokeDynamicType || site == syms.methodHandleType : site;
926 ClassSymbol c = (ClassSymbol) site.tsym;
927 Scope implicit = c.members().next;
928 if (implicit == null) {
929 c.members().next = implicit = new Scope(c);
930 }
931 Type restype;
932 if (typeargtypes.isEmpty()) {
933 restype = syms.objectType;
934 } else {
935 restype = typeargtypes.head;
936 if (!typeargtypes.tail.isEmpty())
937 return methodNotFound;
938 }
939 List<Type> paramtypes = Type.map(argtypes, implicitArgType);
940 long flags;
941 List<Type> exType;
942 if (spMethod != null) {
943 exType = spMethod.getThrownTypes();
944 flags = spMethod.flags() & AccessFlags;
945 } else {
946 // make it throw all exceptions
947 //assert(site == syms.invokeDynamicType);
948 exType = List.of(syms.throwableType);
949 flags = PUBLIC | STATIC;
950 }
951 MethodType mtype = new MethodType(paramtypes,
952 restype,
953 exType,
954 syms.methodClass);
955 flags |= ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE;
956 Symbol m = null;
957 for (Scope.Entry e = implicit.lookup(name);
958 e.scope != null;
959 e = e.next()) {
960 Symbol sym = e.sym;
961 assert sym.kind == MTH;
962 if (types.isSameType(mtype, sym.type)
963 && (sym.flags() & STATIC) == (flags & STATIC)) {
964 m = sym;
965 break;
966 }
967 }
968 if (m == null) {
969 // create the desired method
970 m = new MethodSymbol(flags, name, mtype, c);
971 implicit.enter(m);
972 }
973 assert argumentsAcceptable(argtypes, types.memberType(site, m).getParameterTypes(),
974 false, false, Warner.noWarnings);
975 assert null != instantiate(env, site, m, argtypes, typeargtypes, false, false, Warner.noWarnings);
976 return m;
977 }
978 //where
979 Mapping implicitArgType = new Mapping ("implicitArgType") {
980 public Type apply(Type t) { return implicitArgType(t); }
981 };
982 Type implicitArgType(Type argType) {
983 argType = types.erasure(argType);
984 if (argType.tag == BOT)
985 // nulls type as the marker type Null (which has no instances)
986 // TO DO: figure out how to access java.lang.Null safely, else throw nice error
987 //argType = types.boxedClass(syms.botType).type;
988 argType = types.boxedClass(syms.voidType).type; // REMOVE
989 return argType;
990 }
992 /** Load toplevel or member class with given fully qualified name and
993 * verify that it is accessible.
994 * @param env The current environment.
995 * @param name The fully qualified name of the class to be loaded.
996 */
997 Symbol loadClass(Env<AttrContext> env, Name name) {
998 try {
999 ClassSymbol c = reader.loadClass(name);
1000 return isAccessible(env, c) ? c : new AccessError(c);
1001 } catch (ClassReader.BadClassFile err) {
1002 throw err;
1003 } catch (CompletionFailure ex) {
1004 return typeNotFound;
1005 }
1006 }
1008 /** Find qualified member type.
1009 * @param env The current environment.
1010 * @param site The original type from where the selection takes
1011 * place.
1012 * @param name The type's name.
1013 * @param c The class to search for the member type. This is
1014 * always a superclass or implemented interface of
1015 * site's class.
1016 */
1017 Symbol findMemberType(Env<AttrContext> env,
1018 Type site,
1019 Name name,
1020 TypeSymbol c) {
1021 Symbol bestSoFar = typeNotFound;
1022 Symbol sym;
1023 Scope.Entry e = c.members().lookup(name);
1024 while (e.scope != null) {
1025 if (e.sym.kind == TYP) {
1026 return isAccessible(env, site, e.sym)
1027 ? e.sym
1028 : new AccessError(env, site, e.sym);
1029 }
1030 e = e.next();
1031 }
1032 Type st = types.supertype(c.type);
1033 if (st != null && st.tag == CLASS) {
1034 sym = findMemberType(env, site, name, st.tsym);
1035 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1036 }
1037 for (List<Type> l = types.interfaces(c.type);
1038 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1039 l = l.tail) {
1040 sym = findMemberType(env, site, name, l.head.tsym);
1041 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1042 sym.owner != bestSoFar.owner)
1043 bestSoFar = new AmbiguityError(bestSoFar, sym);
1044 else if (sym.kind < bestSoFar.kind)
1045 bestSoFar = sym;
1046 }
1047 return bestSoFar;
1048 }
1050 /** Find a global type in given scope and load corresponding class.
1051 * @param env The current environment.
1052 * @param scope The scope in which to look for the type.
1053 * @param name The type's name.
1054 */
1055 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1056 Symbol bestSoFar = typeNotFound;
1057 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1058 Symbol sym = loadClass(env, e.sym.flatName());
1059 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1060 bestSoFar != sym)
1061 return new AmbiguityError(bestSoFar, sym);
1062 else if (sym.kind < bestSoFar.kind)
1063 bestSoFar = sym;
1064 }
1065 return bestSoFar;
1066 }
1068 /** Find an unqualified type symbol.
1069 * @param env The current environment.
1070 * @param name The type's name.
1071 */
1072 Symbol findType(Env<AttrContext> env, Name name) {
1073 Symbol bestSoFar = typeNotFound;
1074 Symbol sym;
1075 boolean staticOnly = false;
1076 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1077 if (isStatic(env1)) staticOnly = true;
1078 for (Scope.Entry e = env1.info.scope.lookup(name);
1079 e.scope != null;
1080 e = e.next()) {
1081 if (e.sym.kind == TYP) {
1082 if (staticOnly &&
1083 e.sym.type.tag == TYPEVAR &&
1084 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1085 return e.sym;
1086 }
1087 }
1089 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1090 env1.enclClass.sym);
1091 if (staticOnly && sym.kind == TYP &&
1092 sym.type.tag == CLASS &&
1093 sym.type.getEnclosingType().tag == CLASS &&
1094 env1.enclClass.sym.type.isParameterized() &&
1095 sym.type.getEnclosingType().isParameterized())
1096 return new StaticError(sym);
1097 else if (sym.exists()) return sym;
1098 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1100 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1101 if ((encl.sym.flags() & STATIC) != 0)
1102 staticOnly = true;
1103 }
1105 if (env.tree.getTag() != JCTree.IMPORT) {
1106 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1107 if (sym.exists()) return sym;
1108 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1110 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1111 if (sym.exists()) return sym;
1112 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1114 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1115 if (sym.exists()) return sym;
1116 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1117 }
1119 return bestSoFar;
1120 }
1122 /** Find an unqualified identifier which matches a specified kind set.
1123 * @param env The current environment.
1124 * @param name The indentifier's name.
1125 * @param kind Indicates the possible symbol kinds
1126 * (a subset of VAL, TYP, PCK).
1127 */
1128 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1129 Symbol bestSoFar = typeNotFound;
1130 Symbol sym;
1132 if ((kind & VAR) != 0) {
1133 sym = findVar(env, name);
1134 if (sym.exists()) return sym;
1135 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1136 }
1138 if ((kind & TYP) != 0) {
1139 sym = findType(env, name);
1140 if (sym.exists()) return sym;
1141 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1142 }
1144 if ((kind & PCK) != 0) return reader.enterPackage(name);
1145 else return bestSoFar;
1146 }
1148 /** Find an identifier in a package which matches a specified kind set.
1149 * @param env The current environment.
1150 * @param name The identifier's name.
1151 * @param kind Indicates the possible symbol kinds
1152 * (a nonempty subset of TYP, PCK).
1153 */
1154 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1155 Name name, int kind) {
1156 Name fullname = TypeSymbol.formFullName(name, pck);
1157 Symbol bestSoFar = typeNotFound;
1158 PackageSymbol pack = null;
1159 if ((kind & PCK) != 0) {
1160 pack = reader.enterPackage(fullname);
1161 if (pack.exists()) return pack;
1162 }
1163 if ((kind & TYP) != 0) {
1164 Symbol sym = loadClass(env, fullname);
1165 if (sym.exists()) {
1166 // don't allow programs to use flatnames
1167 if (name == sym.name) return sym;
1168 }
1169 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1170 }
1171 return (pack != null) ? pack : bestSoFar;
1172 }
1174 /** Find an identifier among the members of a given type `site'.
1175 * @param env The current environment.
1176 * @param site The type containing the symbol to be found.
1177 * @param name The identifier's name.
1178 * @param kind Indicates the possible symbol kinds
1179 * (a subset of VAL, TYP).
1180 */
1181 Symbol findIdentInType(Env<AttrContext> env, Type site,
1182 Name name, int kind) {
1183 Symbol bestSoFar = typeNotFound;
1184 Symbol sym;
1185 if ((kind & VAR) != 0) {
1186 sym = findField(env, site, name, site.tsym);
1187 if (sym.exists()) return sym;
1188 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1189 }
1191 if ((kind & TYP) != 0) {
1192 sym = findMemberType(env, site, name, site.tsym);
1193 if (sym.exists()) return sym;
1194 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1195 }
1196 return bestSoFar;
1197 }
1199 /* ***************************************************************************
1200 * Access checking
1201 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1202 * an error message in the process
1203 ****************************************************************************/
1205 /** If `sym' is a bad symbol: report error and return errSymbol
1206 * else pass through unchanged,
1207 * additional arguments duplicate what has been used in trying to find the
1208 * symbol (--> flyweight pattern). This improves performance since we
1209 * expect misses to happen frequently.
1210 *
1211 * @param sym The symbol that was found, or a ResolveError.
1212 * @param pos The position to use for error reporting.
1213 * @param site The original type from where the selection took place.
1214 * @param name The symbol's name.
1215 * @param argtypes The invocation's value arguments,
1216 * if we looked for a method.
1217 * @param typeargtypes The invocation's type arguments,
1218 * if we looked for a method.
1219 */
1220 Symbol access(Symbol sym,
1221 DiagnosticPosition pos,
1222 Type site,
1223 Name name,
1224 boolean qualified,
1225 List<Type> argtypes,
1226 List<Type> typeargtypes) {
1227 if (sym.kind >= AMBIGUOUS) {
1228 ResolveError errSym = (ResolveError)sym;
1229 if (!site.isErroneous() &&
1230 !Type.isErroneous(argtypes) &&
1231 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
1232 logResolveError(errSym, pos, site, name, argtypes, typeargtypes);
1233 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1234 }
1235 return sym;
1236 }
1238 /** Same as above, but without type arguments and arguments.
1239 */
1240 Symbol access(Symbol sym,
1241 DiagnosticPosition pos,
1242 Type site,
1243 Name name,
1244 boolean qualified) {
1245 if (sym.kind >= AMBIGUOUS)
1246 return access(sym, pos, site, name, qualified, List.<Type>nil(), null);
1247 else
1248 return sym;
1249 }
1251 /** Check that sym is not an abstract method.
1252 */
1253 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1254 if ((sym.flags() & ABSTRACT) != 0)
1255 log.error(pos, "abstract.cant.be.accessed.directly",
1256 kindName(sym), sym, sym.location());
1257 }
1259 /* ***************************************************************************
1260 * Debugging
1261 ****************************************************************************/
1263 /** print all scopes starting with scope s and proceeding outwards.
1264 * used for debugging.
1265 */
1266 public void printscopes(Scope s) {
1267 while (s != null) {
1268 if (s.owner != null)
1269 System.err.print(s.owner + ": ");
1270 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1271 if ((e.sym.flags() & ABSTRACT) != 0)
1272 System.err.print("abstract ");
1273 System.err.print(e.sym + " ");
1274 }
1275 System.err.println();
1276 s = s.next;
1277 }
1278 }
1280 void printscopes(Env<AttrContext> env) {
1281 while (env.outer != null) {
1282 System.err.println("------------------------------");
1283 printscopes(env.info.scope);
1284 env = env.outer;
1285 }
1286 }
1288 public void printscopes(Type t) {
1289 while (t.tag == CLASS) {
1290 printscopes(t.tsym.members());
1291 t = types.supertype(t);
1292 }
1293 }
1295 /* ***************************************************************************
1296 * Name resolution
1297 * Naming conventions are as for symbol lookup
1298 * Unlike the find... methods these methods will report access errors
1299 ****************************************************************************/
1301 /** Resolve an unqualified (non-method) identifier.
1302 * @param pos The position to use for error reporting.
1303 * @param env The environment current at the identifier use.
1304 * @param name The identifier's name.
1305 * @param kind The set of admissible symbol kinds for the identifier.
1306 */
1307 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
1308 Name name, int kind) {
1309 return access(
1310 findIdent(env, name, kind),
1311 pos, env.enclClass.sym.type, name, false);
1312 }
1314 /** Resolve an unqualified method identifier.
1315 * @param pos The position to use for error reporting.
1316 * @param env The environment current at the method invocation.
1317 * @param name The identifier's name.
1318 * @param argtypes The types of the invocation's value arguments.
1319 * @param typeargtypes The types of the invocation's type arguments.
1320 */
1321 Symbol resolveMethod(DiagnosticPosition pos,
1322 Env<AttrContext> env,
1323 Name name,
1324 List<Type> argtypes,
1325 List<Type> typeargtypes) {
1326 Symbol sym = methodNotFound;
1327 List<MethodResolutionPhase> steps = methodResolutionSteps;
1328 while (steps.nonEmpty() &&
1329 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1330 sym.kind >= ERRONEOUS) {
1331 sym = findFun(env, name, argtypes, typeargtypes,
1332 steps.head.isBoxingRequired,
1333 env.info.varArgs = steps.head.isVarargsRequired);
1334 methodResolutionCache.put(steps.head, sym);
1335 steps = steps.tail;
1336 }
1337 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1338 MethodResolutionPhase errPhase =
1339 firstErroneousResolutionPhase();
1340 sym = access(methodResolutionCache.get(errPhase),
1341 pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
1342 env.info.varArgs = errPhase.isVarargsRequired;
1343 }
1344 return sym;
1345 }
1347 /** Resolve a qualified method identifier
1348 * @param pos The position to use for error reporting.
1349 * @param env The environment current at the method invocation.
1350 * @param site The type of the qualifying expression, in which
1351 * identifier is searched.
1352 * @param name The identifier's name.
1353 * @param argtypes The types of the invocation's value arguments.
1354 * @param typeargtypes The types of the invocation's type arguments.
1355 */
1356 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1357 Type site, Name name, List<Type> argtypes,
1358 List<Type> typeargtypes) {
1359 Symbol sym = methodNotFound;
1360 List<MethodResolutionPhase> steps = methodResolutionSteps;
1361 while (steps.nonEmpty() &&
1362 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1363 sym.kind >= ERRONEOUS) {
1364 sym = findMethod(env, site, name, argtypes, typeargtypes,
1365 steps.head.isBoxingRequired(),
1366 env.info.varArgs = steps.head.isVarargsRequired(), false);
1367 methodResolutionCache.put(steps.head, sym);
1368 steps = steps.tail;
1369 }
1370 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1371 MethodResolutionPhase errPhase =
1372 firstErroneousResolutionPhase();
1373 sym = access(methodResolutionCache.get(errPhase),
1374 pos, site, name, true, argtypes, typeargtypes);
1375 env.info.varArgs = errPhase.isVarargsRequired;
1376 }
1377 return sym;
1378 }
1380 /** Resolve a qualified method identifier, throw a fatal error if not
1381 * found.
1382 * @param pos The position to use for error reporting.
1383 * @param env The environment current at the method invocation.
1384 * @param site The type of the qualifying expression, in which
1385 * identifier is searched.
1386 * @param name The identifier's name.
1387 * @param argtypes The types of the invocation's value arguments.
1388 * @param typeargtypes The types of the invocation's type arguments.
1389 */
1390 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
1391 Type site, Name name,
1392 List<Type> argtypes,
1393 List<Type> typeargtypes) {
1394 Symbol sym = resolveQualifiedMethod(
1395 pos, env, site, name, argtypes, typeargtypes);
1396 if (sym.kind == MTH) return (MethodSymbol)sym;
1397 else throw new FatalError(
1398 diags.fragment("fatal.err.cant.locate.meth",
1399 name));
1400 }
1402 /** Resolve constructor.
1403 * @param pos The position to use for error reporting.
1404 * @param env The environment current at the constructor invocation.
1405 * @param site The type of class for which a constructor is searched.
1406 * @param argtypes The types of the constructor invocation's value
1407 * arguments.
1408 * @param typeargtypes The types of the constructor invocation's type
1409 * arguments.
1410 */
1411 Symbol resolveConstructor(DiagnosticPosition pos,
1412 Env<AttrContext> env,
1413 Type site,
1414 List<Type> argtypes,
1415 List<Type> typeargtypes) {
1416 Symbol sym = methodNotFound;
1417 List<MethodResolutionPhase> steps = methodResolutionSteps;
1418 while (steps.nonEmpty() &&
1419 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1420 sym.kind >= ERRONEOUS) {
1421 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1422 steps.head.isBoxingRequired(),
1423 env.info.varArgs = steps.head.isVarargsRequired());
1424 methodResolutionCache.put(steps.head, sym);
1425 steps = steps.tail;
1426 }
1427 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1428 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1429 sym = access(methodResolutionCache.get(errPhase),
1430 pos, site, names.init, true, argtypes, typeargtypes);
1431 env.info.varArgs = errPhase.isVarargsRequired();
1432 }
1433 return sym;
1434 }
1436 /** Resolve constructor using diamond inference.
1437 * @param pos The position to use for error reporting.
1438 * @param env The environment current at the constructor invocation.
1439 * @param site The type of class for which a constructor is searched.
1440 * The scope of this class has been touched in attribution.
1441 * @param argtypes The types of the constructor invocation's value
1442 * arguments.
1443 * @param typeargtypes The types of the constructor invocation's type
1444 * arguments.
1445 */
1446 Symbol resolveDiamond(DiagnosticPosition pos,
1447 Env<AttrContext> env,
1448 Type site,
1449 List<Type> argtypes,
1450 List<Type> typeargtypes, boolean reportErrors) {
1451 Symbol sym = methodNotFound;
1452 JCDiagnostic explanation = null;
1453 List<MethodResolutionPhase> steps = methodResolutionSteps;
1454 while (steps.nonEmpty() &&
1455 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1456 sym.kind >= ERRONEOUS) {
1457 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1458 steps.head.isBoxingRequired(),
1459 env.info.varArgs = steps.head.isVarargsRequired());
1460 methodResolutionCache.put(steps.head, sym);
1461 if (sym.kind == WRONG_MTH &&
1462 ((InapplicableSymbolError)sym).explanation != null) {
1463 //if the symbol is an inapplicable method symbol, then the
1464 //explanation contains the reason for which inference failed
1465 explanation = ((InapplicableSymbolError)sym).explanation;
1466 }
1467 steps = steps.tail;
1468 }
1469 if (sym.kind >= AMBIGUOUS && reportErrors) {
1470 String key = explanation == null ?
1471 "cant.apply.diamond" :
1472 "cant.apply.diamond.1";
1473 log.error(pos, key, diags.fragment("diamond", site.tsym), explanation);
1474 }
1475 return sym;
1476 }
1478 /** Resolve constructor.
1479 * @param pos The position to use for error reporting.
1480 * @param env The environment current at the constructor invocation.
1481 * @param site The type of class for which a constructor is searched.
1482 * @param argtypes The types of the constructor invocation's value
1483 * arguments.
1484 * @param typeargtypes The types of the constructor invocation's type
1485 * arguments.
1486 * @param allowBoxing Allow boxing and varargs conversions.
1487 * @param useVarargs Box trailing arguments into an array for varargs.
1488 */
1489 Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1490 Type site, List<Type> argtypes,
1491 List<Type> typeargtypes,
1492 boolean allowBoxing,
1493 boolean useVarargs) {
1494 Symbol sym = findMethod(env, site,
1495 names.init, argtypes,
1496 typeargtypes, allowBoxing,
1497 useVarargs, false);
1498 if ((sym.flags() & DEPRECATED) != 0 &&
1499 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
1500 env.info.scope.owner.outermostClass() != sym.outermostClass())
1501 chk.warnDeprecated(pos, sym);
1502 return sym;
1503 }
1505 /** Resolve a constructor, throw a fatal error if not found.
1506 * @param pos The position to use for error reporting.
1507 * @param env The environment current at the method invocation.
1508 * @param site The type to be constructed.
1509 * @param argtypes The types of the invocation's value arguments.
1510 * @param typeargtypes The types of the invocation's type arguments.
1511 */
1512 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1513 Type site,
1514 List<Type> argtypes,
1515 List<Type> typeargtypes) {
1516 Symbol sym = resolveConstructor(
1517 pos, env, site, argtypes, typeargtypes);
1518 if (sym.kind == MTH) return (MethodSymbol)sym;
1519 else throw new FatalError(
1520 diags.fragment("fatal.err.cant.locate.ctor", site));
1521 }
1523 /** Resolve operator.
1524 * @param pos The position to use for error reporting.
1525 * @param optag The tag of the operation tree.
1526 * @param env The environment current at the operation.
1527 * @param argtypes The types of the operands.
1528 */
1529 Symbol resolveOperator(DiagnosticPosition pos, int optag,
1530 Env<AttrContext> env, List<Type> argtypes) {
1531 Name name = treeinfo.operatorName(optag);
1532 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
1533 null, false, false, true);
1534 if (boxingEnabled && sym.kind >= WRONG_MTHS)
1535 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1536 null, true, false, true);
1537 return access(sym, pos, env.enclClass.sym.type, name,
1538 false, argtypes, null);
1539 }
1541 /** Resolve operator.
1542 * @param pos The position to use for error reporting.
1543 * @param optag The tag of the operation tree.
1544 * @param env The environment current at the operation.
1545 * @param arg The type of the operand.
1546 */
1547 Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) {
1548 return resolveOperator(pos, optag, env, List.of(arg));
1549 }
1551 /** Resolve binary operator.
1552 * @param pos The position to use for error reporting.
1553 * @param optag The tag of the operation tree.
1554 * @param env The environment current at the operation.
1555 * @param left The types of the left operand.
1556 * @param right The types of the right operand.
1557 */
1558 Symbol resolveBinaryOperator(DiagnosticPosition pos,
1559 int optag,
1560 Env<AttrContext> env,
1561 Type left,
1562 Type right) {
1563 return resolveOperator(pos, optag, env, List.of(left, right));
1564 }
1566 /**
1567 * Resolve `c.name' where name == this or name == super.
1568 * @param pos The position to use for error reporting.
1569 * @param env The environment current at the expression.
1570 * @param c The qualifier.
1571 * @param name The identifier's name.
1572 */
1573 Symbol resolveSelf(DiagnosticPosition pos,
1574 Env<AttrContext> env,
1575 TypeSymbol c,
1576 Name name) {
1577 Env<AttrContext> env1 = env;
1578 boolean staticOnly = false;
1579 while (env1.outer != null) {
1580 if (isStatic(env1)) staticOnly = true;
1581 if (env1.enclClass.sym == c) {
1582 Symbol sym = env1.info.scope.lookup(name).sym;
1583 if (sym != null) {
1584 if (staticOnly) sym = new StaticError(sym);
1585 return access(sym, pos, env.enclClass.sym.type,
1586 name, true);
1587 }
1588 }
1589 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1590 env1 = env1.outer;
1591 }
1592 log.error(pos, "not.encl.class", c);
1593 return syms.errSymbol;
1594 }
1596 /**
1597 * Resolve `c.this' for an enclosing class c that contains the
1598 * named member.
1599 * @param pos The position to use for error reporting.
1600 * @param env The environment current at the expression.
1601 * @param member The member that must be contained in the result.
1602 */
1603 Symbol resolveSelfContaining(DiagnosticPosition pos,
1604 Env<AttrContext> env,
1605 Symbol member) {
1606 Name name = names._this;
1607 Env<AttrContext> env1 = env;
1608 boolean staticOnly = false;
1609 while (env1.outer != null) {
1610 if (isStatic(env1)) staticOnly = true;
1611 if (env1.enclClass.sym.isSubClass(member.owner, types) &&
1612 isAccessible(env, env1.enclClass.sym.type, member)) {
1613 Symbol sym = env1.info.scope.lookup(name).sym;
1614 if (sym != null) {
1615 if (staticOnly) sym = new StaticError(sym);
1616 return access(sym, pos, env.enclClass.sym.type,
1617 name, true);
1618 }
1619 }
1620 if ((env1.enclClass.sym.flags() & STATIC) != 0)
1621 staticOnly = true;
1622 env1 = env1.outer;
1623 }
1624 log.error(pos, "encl.class.required", member);
1625 return syms.errSymbol;
1626 }
1628 /**
1629 * Resolve an appropriate implicit this instance for t's container.
1630 * JLS2 8.8.5.1 and 15.9.2
1631 */
1632 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
1633 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
1634 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
1635 : resolveSelfContaining(pos, env, t.tsym)).type;
1636 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
1637 log.error(pos, "cant.ref.before.ctor.called", "this");
1638 return thisType;
1639 }
1641 /* ***************************************************************************
1642 * ResolveError classes, indicating error situations when accessing symbols
1643 ****************************************************************************/
1645 public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
1646 AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
1647 logResolveError(error, tree.pos(), type.getEnclosingType(), null, null, null);
1648 }
1649 //where
1650 private void logResolveError(ResolveError error,
1651 DiagnosticPosition pos,
1652 Type site,
1653 Name name,
1654 List<Type> argtypes,
1655 List<Type> typeargtypes) {
1656 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
1657 pos, site, name, argtypes, typeargtypes);
1658 if (d != null)
1659 log.report(d);
1660 }
1662 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
1664 public Object methodArguments(List<Type> argtypes) {
1665 return argtypes.isEmpty() ? noArgs : argtypes;
1666 }
1668 /**
1669 * Root class for resolution errors. Subclass of ResolveError
1670 * represent a different kinds of resolution error - as such they must
1671 * specify how they map into concrete compiler diagnostics.
1672 */
1673 private abstract class ResolveError extends Symbol {
1675 /** The name of the kind of error, for debugging only. */
1676 final String debugName;
1678 ResolveError(int kind, String debugName) {
1679 super(kind, 0, null, null, null);
1680 this.debugName = debugName;
1681 }
1683 @Override
1684 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1685 throw new AssertionError();
1686 }
1688 @Override
1689 public String toString() {
1690 return debugName;
1691 }
1693 @Override
1694 public boolean exists() {
1695 return false;
1696 }
1698 /**
1699 * Create an external representation for this erroneous symbol to be
1700 * used during attribution - by default this returns the symbol of a
1701 * brand new error type which stores the original type found
1702 * during resolution.
1703 *
1704 * @param name the name used during resolution
1705 * @param location the location from which the symbol is accessed
1706 */
1707 protected Symbol access(Name name, TypeSymbol location) {
1708 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1709 }
1711 /**
1712 * Create a diagnostic representing this resolution error.
1713 *
1714 * @param dkind The kind of the diagnostic to be created (e.g error).
1715 * @param pos The position to be used for error reporting.
1716 * @param site The original type from where the selection took place.
1717 * @param name The name of the symbol to be resolved.
1718 * @param argtypes The invocation's value arguments,
1719 * if we looked for a method.
1720 * @param typeargtypes The invocation's type arguments,
1721 * if we looked for a method.
1722 */
1723 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1724 DiagnosticPosition pos,
1725 Type site,
1726 Name name,
1727 List<Type> argtypes,
1728 List<Type> typeargtypes);
1730 /**
1731 * A name designates an operator if it consists
1732 * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
1733 */
1734 boolean isOperator(Name name) {
1735 int i = 0;
1736 while (i < name.getByteLength() &&
1737 "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
1738 return i > 0 && i == name.getByteLength();
1739 }
1740 }
1742 /**
1743 * This class is the root class of all resolution errors caused by
1744 * an invalid symbol being found during resolution.
1745 */
1746 abstract class InvalidSymbolError extends ResolveError {
1748 /** The invalid symbol found during resolution */
1749 Symbol sym;
1751 InvalidSymbolError(int kind, Symbol sym, String debugName) {
1752 super(kind, debugName);
1753 this.sym = sym;
1754 }
1756 @Override
1757 public boolean exists() {
1758 return true;
1759 }
1761 @Override
1762 public String toString() {
1763 return super.toString() + " wrongSym=" + sym;
1764 }
1766 @Override
1767 public Symbol access(Name name, TypeSymbol location) {
1768 if (sym.kind >= AMBIGUOUS)
1769 return ((ResolveError)sym).access(name, location);
1770 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
1771 return types.createErrorType(name, location, sym.type).tsym;
1772 else
1773 return sym;
1774 }
1775 }
1777 /**
1778 * InvalidSymbolError error class indicating that a symbol matching a
1779 * given name does not exists in a given site.
1780 */
1781 class SymbolNotFoundError extends ResolveError {
1783 SymbolNotFoundError(int kind) {
1784 super(kind, "symbol not found error");
1785 }
1787 @Override
1788 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1789 DiagnosticPosition pos,
1790 Type site,
1791 Name name,
1792 List<Type> argtypes,
1793 List<Type> typeargtypes) {
1794 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
1795 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
1796 if (name == names.error)
1797 return null;
1799 if (isOperator(name)) {
1800 return diags.create(dkind, log.currentSource(), pos,
1801 "operator.cant.be.applied", name, argtypes);
1802 }
1803 boolean hasLocation = false;
1804 if (!site.tsym.name.isEmpty()) {
1805 if (site.tsym.kind == PCK && !site.tsym.exists()) {
1806 return diags.create(dkind, log.currentSource(), pos,
1807 "doesnt.exist", site.tsym);
1808 }
1809 hasLocation = true;
1810 }
1811 boolean isConstructor = kind == ABSENT_MTH &&
1812 name == names.table.names.init;
1813 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
1814 Name idname = isConstructor ? site.tsym.name : name;
1815 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
1816 if (hasLocation) {
1817 return diags.create(dkind, log.currentSource(), pos,
1818 errKey, kindname, idname, //symbol kindname, name
1819 typeargtypes, argtypes, //type parameters and arguments (if any)
1820 typeKindName(site), site); //location kindname, type
1821 }
1822 else {
1823 return diags.create(dkind, log.currentSource(), pos,
1824 errKey, kindname, idname, //symbol kindname, name
1825 typeargtypes, argtypes); //type parameters and arguments (if any)
1826 }
1827 }
1828 //where
1829 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
1830 String key = "cant.resolve";
1831 String suffix = hasLocation ? ".location" : "";
1832 switch (kindname) {
1833 case METHOD:
1834 case CONSTRUCTOR: {
1835 suffix += ".args";
1836 suffix += hasTypeArgs ? ".params" : "";
1837 }
1838 }
1839 return key + suffix;
1840 }
1841 }
1843 /**
1844 * InvalidSymbolError error class indicating that a given symbol
1845 * (either a method, a constructor or an operand) is not applicable
1846 * given an actual arguments/type argument list.
1847 */
1848 class InapplicableSymbolError extends InvalidSymbolError {
1850 /** An auxiliary explanation set in case of instantiation errors. */
1851 JCDiagnostic explanation;
1853 InapplicableSymbolError(Symbol sym) {
1854 super(WRONG_MTH, sym, "inapplicable symbol error");
1855 }
1857 /** Update sym and explanation and return this.
1858 */
1859 InapplicableSymbolError setWrongSym(Symbol sym, JCDiagnostic explanation) {
1860 this.sym = sym;
1861 this.explanation = explanation;
1862 return this;
1863 }
1865 /** Update sym and return this.
1866 */
1867 InapplicableSymbolError setWrongSym(Symbol sym) {
1868 this.sym = sym;
1869 this.explanation = null;
1870 return this;
1871 }
1873 @Override
1874 public String toString() {
1875 return super.toString() + " explanation=" + explanation;
1876 }
1878 @Override
1879 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1880 DiagnosticPosition pos,
1881 Type site,
1882 Name name,
1883 List<Type> argtypes,
1884 List<Type> typeargtypes) {
1885 if (name == names.error)
1886 return null;
1888 if (isOperator(name)) {
1889 return diags.create(dkind, log.currentSource(),
1890 pos, "operator.cant.be.applied", name, argtypes);
1891 }
1892 else {
1893 Symbol ws = sym.asMemberOf(site, types);
1894 return diags.create(dkind, log.currentSource(), pos,
1895 "cant.apply.symbol" + (explanation != null ? ".1" : ""),
1896 kindName(ws),
1897 ws.name == names.init ? ws.owner.name : ws.name,
1898 methodArguments(ws.type.getParameterTypes()),
1899 methodArguments(argtypes),
1900 kindName(ws.owner),
1901 ws.owner.type,
1902 explanation);
1903 }
1904 }
1906 @Override
1907 public Symbol access(Name name, TypeSymbol location) {
1908 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1909 }
1910 }
1912 /**
1913 * ResolveError error class indicating that a set of symbols
1914 * (either methods, constructors or operands) is not applicable
1915 * given an actual arguments/type argument list.
1916 */
1917 class InapplicableSymbolsError extends ResolveError {
1918 InapplicableSymbolsError(Symbol sym) {
1919 super(WRONG_MTHS, "inapplicable symbols");
1920 }
1922 @Override
1923 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1924 DiagnosticPosition pos,
1925 Type site,
1926 Name name,
1927 List<Type> argtypes,
1928 List<Type> typeargtypes) {
1929 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
1930 site, name, argtypes, typeargtypes);
1931 }
1932 }
1934 /**
1935 * An InvalidSymbolError error class indicating that a symbol is not
1936 * accessible from a given site
1937 */
1938 class AccessError extends InvalidSymbolError {
1940 private Env<AttrContext> env;
1941 private Type site;
1943 AccessError(Symbol sym) {
1944 this(null, null, sym);
1945 }
1947 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
1948 super(HIDDEN, sym, "access error");
1949 this.env = env;
1950 this.site = site;
1951 if (debugResolve)
1952 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
1953 }
1955 @Override
1956 public boolean exists() {
1957 return false;
1958 }
1960 @Override
1961 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1962 DiagnosticPosition pos,
1963 Type site,
1964 Name name,
1965 List<Type> argtypes,
1966 List<Type> typeargtypes) {
1967 if (sym.owner.type.tag == ERROR)
1968 return null;
1970 if (sym.name == names.init && sym.owner != site.tsym) {
1971 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
1972 pos, site, name, argtypes, typeargtypes);
1973 }
1974 else if ((sym.flags() & PUBLIC) != 0
1975 || (env != null && this.site != null
1976 && !isAccessible(env, this.site))) {
1977 return diags.create(dkind, log.currentSource(),
1978 pos, "not.def.access.class.intf.cant.access",
1979 sym, sym.location());
1980 }
1981 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
1982 return diags.create(dkind, log.currentSource(),
1983 pos, "report.access", sym,
1984 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
1985 sym.location());
1986 }
1987 else {
1988 return diags.create(dkind, log.currentSource(),
1989 pos, "not.def.public.cant.access", sym, sym.location());
1990 }
1991 }
1992 }
1994 /**
1995 * InvalidSymbolError error class indicating that an instance member
1996 * has erroneously been accessed from a static context.
1997 */
1998 class StaticError extends InvalidSymbolError {
2000 StaticError(Symbol sym) {
2001 super(STATICERR, sym, "static error");
2002 }
2004 @Override
2005 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2006 DiagnosticPosition pos,
2007 Type site,
2008 Name name,
2009 List<Type> argtypes,
2010 List<Type> typeargtypes) {
2011 Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
2012 ? types.erasure(sym.type).tsym
2013 : sym);
2014 return diags.create(dkind, log.currentSource(), pos,
2015 "non-static.cant.be.ref", kindName(sym), errSym);
2016 }
2017 }
2019 /**
2020 * InvalidSymbolError error class indicating that a pair of symbols
2021 * (either methods, constructors or operands) are ambiguous
2022 * given an actual arguments/type argument list.
2023 */
2024 class AmbiguityError extends InvalidSymbolError {
2026 /** The other maximally specific symbol */
2027 Symbol sym2;
2029 AmbiguityError(Symbol sym1, Symbol sym2) {
2030 super(AMBIGUOUS, sym1, "ambiguity error");
2031 this.sym2 = sym2;
2032 }
2034 @Override
2035 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2036 DiagnosticPosition pos,
2037 Type site,
2038 Name name,
2039 List<Type> argtypes,
2040 List<Type> typeargtypes) {
2041 AmbiguityError pair = this;
2042 while (true) {
2043 if (pair.sym.kind == AMBIGUOUS)
2044 pair = (AmbiguityError)pair.sym;
2045 else if (pair.sym2.kind == AMBIGUOUS)
2046 pair = (AmbiguityError)pair.sym2;
2047 else break;
2048 }
2049 Name sname = pair.sym.name;
2050 if (sname == names.init) sname = pair.sym.owner.name;
2051 return diags.create(dkind, log.currentSource(),
2052 pos, "ref.ambiguous", sname,
2053 kindName(pair.sym),
2054 pair.sym,
2055 pair.sym.location(site, types),
2056 kindName(pair.sym2),
2057 pair.sym2,
2058 pair.sym2.location(site, types));
2059 }
2060 }
2062 enum MethodResolutionPhase {
2063 BASIC(false, false),
2064 BOX(true, false),
2065 VARARITY(true, true);
2067 boolean isBoxingRequired;
2068 boolean isVarargsRequired;
2070 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
2071 this.isBoxingRequired = isBoxingRequired;
2072 this.isVarargsRequired = isVarargsRequired;
2073 }
2075 public boolean isBoxingRequired() {
2076 return isBoxingRequired;
2077 }
2079 public boolean isVarargsRequired() {
2080 return isVarargsRequired;
2081 }
2083 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
2084 return (varargsEnabled || !isVarargsRequired) &&
2085 (boxingEnabled || !isBoxingRequired);
2086 }
2087 }
2089 private Map<MethodResolutionPhase, Symbol> methodResolutionCache =
2090 new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length);
2092 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
2094 private MethodResolutionPhase firstErroneousResolutionPhase() {
2095 MethodResolutionPhase bestSoFar = BASIC;
2096 Symbol sym = methodNotFound;
2097 List<MethodResolutionPhase> steps = methodResolutionSteps;
2098 while (steps.nonEmpty() &&
2099 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
2100 sym.kind >= WRONG_MTHS) {
2101 sym = methodResolutionCache.get(steps.head);
2102 bestSoFar = steps.head;
2103 steps = steps.tail;
2104 }
2105 return bestSoFar;
2106 }
2107 }
