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src/share/classes/com/sun/tools/javac/comp/Resolve.java@9d9d08922405
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Wed, 14 Apr 2010 12:31:55 +0100
- author
- mcimadamore
- date
- Wed, 14 Apr 2010 12:31:55 +0100
- changeset 537
- 9d9d08922405
- parent 325
- ad07b7ea9685
- child 547
- 04cf82179fa7
- child 571
- f0e3ec1f9d9f
- permissions
- -rw-r--r--
6939620: Switch to 'complex' diamond inference scheme
Summary: Implement new inference scheme for diamond operator that takes into account type of actual arguments supplied to constructor
Reviewed-by: jjg, darcy
1 /*
2 * Copyright 1999-2008 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any 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 API supported by Sun Microsystems. If
51 * 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 allowInvokedynamic; // = options.get("invokedynamic");
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 allowInvokedynamic = 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 if (useVarargs && (m.flags() & VARARGS) == 0) return null;
305 Type mt = types.memberType(site, m);
307 // tvars is the list of formal type variables for which type arguments
308 // need to inferred.
309 List<Type> tvars = env.info.tvars;
310 if (typeargtypes == null) typeargtypes = List.nil();
311 if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
312 // This is not a polymorphic method, but typeargs are supplied
313 // which is fine, see JLS3 15.12.2.1
314 } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
315 ForAll pmt = (ForAll) mt;
316 if (typeargtypes.length() != pmt.tvars.length())
317 return null;
318 // Check type arguments are within bounds
319 List<Type> formals = pmt.tvars;
320 List<Type> actuals = typeargtypes;
321 while (formals.nonEmpty() && actuals.nonEmpty()) {
322 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
323 pmt.tvars, typeargtypes);
324 for (; bounds.nonEmpty(); bounds = bounds.tail)
325 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
326 return null;
327 formals = formals.tail;
328 actuals = actuals.tail;
329 }
330 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
331 } else if (mt.tag == FORALL) {
332 ForAll pmt = (ForAll) mt;
333 List<Type> tvars1 = types.newInstances(pmt.tvars);
334 tvars = tvars.appendList(tvars1);
335 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
336 }
338 // find out whether we need to go the slow route via infer
339 boolean instNeeded = tvars.tail != null/*inlined: tvars.nonEmpty()*/;
340 for (List<Type> l = argtypes;
341 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
342 l = l.tail) {
343 if (l.head.tag == FORALL) instNeeded = true;
344 }
346 if (instNeeded)
347 return
348 infer.instantiateMethod(tvars,
349 (MethodType)mt,
350 argtypes,
351 allowBoxing,
352 useVarargs,
353 warn);
354 return
355 argumentsAcceptable(argtypes, mt.getParameterTypes(),
356 allowBoxing, useVarargs, warn)
357 ? mt
358 : null;
359 }
361 /** Same but returns null instead throwing a NoInstanceException
362 */
363 Type instantiate(Env<AttrContext> env,
364 Type site,
365 Symbol m,
366 List<Type> argtypes,
367 List<Type> typeargtypes,
368 boolean allowBoxing,
369 boolean useVarargs,
370 Warner warn) {
371 try {
372 return rawInstantiate(env, site, m, argtypes, typeargtypes,
373 allowBoxing, useVarargs, warn);
374 } catch (Infer.InferenceException ex) {
375 return null;
376 }
377 }
379 /** Check if a parameter list accepts a list of args.
380 */
381 boolean argumentsAcceptable(List<Type> argtypes,
382 List<Type> formals,
383 boolean allowBoxing,
384 boolean useVarargs,
385 Warner warn) {
386 Type varargsFormal = useVarargs ? formals.last() : null;
387 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
388 boolean works = allowBoxing
389 ? types.isConvertible(argtypes.head, formals.head, warn)
390 : types.isSubtypeUnchecked(argtypes.head, formals.head, warn);
391 if (!works) return false;
392 argtypes = argtypes.tail;
393 formals = formals.tail;
394 }
395 if (formals.head != varargsFormal) return false; // not enough args
396 if (!useVarargs)
397 return argtypes.isEmpty();
398 Type elt = types.elemtype(varargsFormal);
399 while (argtypes.nonEmpty()) {
400 if (!types.isConvertible(argtypes.head, elt, warn))
401 return false;
402 argtypes = argtypes.tail;
403 }
404 return true;
405 }
407 /* ***************************************************************************
408 * Symbol lookup
409 * the following naming conventions for arguments are used
410 *
411 * env is the environment where the symbol was mentioned
412 * site is the type of which the symbol is a member
413 * name is the symbol's name
414 * if no arguments are given
415 * argtypes are the value arguments, if we search for a method
416 *
417 * If no symbol was found, a ResolveError detailing the problem is returned.
418 ****************************************************************************/
420 /** Find field. Synthetic fields are always skipped.
421 * @param env The current environment.
422 * @param site The original type from where the selection takes place.
423 * @param name The name of the field.
424 * @param c The class to search for the field. This is always
425 * a superclass or implemented interface of site's class.
426 */
427 Symbol findField(Env<AttrContext> env,
428 Type site,
429 Name name,
430 TypeSymbol c) {
431 while (c.type.tag == TYPEVAR)
432 c = c.type.getUpperBound().tsym;
433 Symbol bestSoFar = varNotFound;
434 Symbol sym;
435 Scope.Entry e = c.members().lookup(name);
436 while (e.scope != null) {
437 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
438 return isAccessible(env, site, e.sym)
439 ? e.sym : new AccessError(env, site, e.sym);
440 }
441 e = e.next();
442 }
443 Type st = types.supertype(c.type);
444 if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
445 sym = findField(env, site, name, st.tsym);
446 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
447 }
448 for (List<Type> l = types.interfaces(c.type);
449 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
450 l = l.tail) {
451 sym = findField(env, site, name, l.head.tsym);
452 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
453 sym.owner != bestSoFar.owner)
454 bestSoFar = new AmbiguityError(bestSoFar, sym);
455 else if (sym.kind < bestSoFar.kind)
456 bestSoFar = sym;
457 }
458 return bestSoFar;
459 }
461 /** Resolve a field identifier, throw a fatal error if not found.
462 * @param pos The position to use for error reporting.
463 * @param env The environment current at the method invocation.
464 * @param site The type of the qualifying expression, in which
465 * identifier is searched.
466 * @param name The identifier's name.
467 */
468 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
469 Type site, Name name) {
470 Symbol sym = findField(env, site, name, site.tsym);
471 if (sym.kind == VAR) return (VarSymbol)sym;
472 else throw new FatalError(
473 diags.fragment("fatal.err.cant.locate.field",
474 name));
475 }
477 /** Find unqualified variable or field with given name.
478 * Synthetic fields always skipped.
479 * @param env The current environment.
480 * @param name The name of the variable or field.
481 */
482 Symbol findVar(Env<AttrContext> env, Name name) {
483 Symbol bestSoFar = varNotFound;
484 Symbol sym;
485 Env<AttrContext> env1 = env;
486 boolean staticOnly = false;
487 while (env1.outer != null) {
488 if (isStatic(env1)) staticOnly = true;
489 Scope.Entry e = env1.info.scope.lookup(name);
490 while (e.scope != null &&
491 (e.sym.kind != VAR ||
492 (e.sym.flags_field & SYNTHETIC) != 0))
493 e = e.next();
494 sym = (e.scope != null)
495 ? e.sym
496 : findField(
497 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
498 if (sym.exists()) {
499 if (staticOnly &&
500 sym.kind == VAR &&
501 sym.owner.kind == TYP &&
502 (sym.flags() & STATIC) == 0)
503 return new StaticError(sym);
504 else
505 return sym;
506 } else if (sym.kind < bestSoFar.kind) {
507 bestSoFar = sym;
508 }
510 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
511 env1 = env1.outer;
512 }
514 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
515 if (sym.exists())
516 return sym;
517 if (bestSoFar.exists())
518 return bestSoFar;
520 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
521 for (; e.scope != null; e = e.next()) {
522 sym = e.sym;
523 Type origin = e.getOrigin().owner.type;
524 if (sym.kind == VAR) {
525 if (e.sym.owner.type != origin)
526 sym = sym.clone(e.getOrigin().owner);
527 return isAccessible(env, origin, sym)
528 ? sym : new AccessError(env, origin, sym);
529 }
530 }
532 Symbol origin = null;
533 e = env.toplevel.starImportScope.lookup(name);
534 for (; e.scope != null; e = e.next()) {
535 sym = e.sym;
536 if (sym.kind != VAR)
537 continue;
538 // invariant: sym.kind == VAR
539 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
540 return new AmbiguityError(bestSoFar, sym);
541 else if (bestSoFar.kind >= VAR) {
542 origin = e.getOrigin().owner;
543 bestSoFar = isAccessible(env, origin.type, sym)
544 ? sym : new AccessError(env, origin.type, sym);
545 }
546 }
547 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
548 return bestSoFar.clone(origin);
549 else
550 return bestSoFar;
551 }
553 Warner noteWarner = new Warner();
555 /** Select the best method for a call site among two choices.
556 * @param env The current environment.
557 * @param site The original type from where the
558 * selection takes place.
559 * @param argtypes The invocation's value arguments,
560 * @param typeargtypes The invocation's type arguments,
561 * @param sym Proposed new best match.
562 * @param bestSoFar Previously found best match.
563 * @param allowBoxing Allow boxing conversions of arguments.
564 * @param useVarargs Box trailing arguments into an array for varargs.
565 */
566 Symbol selectBest(Env<AttrContext> env,
567 Type site,
568 List<Type> argtypes,
569 List<Type> typeargtypes,
570 Symbol sym,
571 Symbol bestSoFar,
572 boolean allowBoxing,
573 boolean useVarargs,
574 boolean operator) {
575 if (sym.kind == ERR) return bestSoFar;
576 if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
577 assert sym.kind < AMBIGUOUS;
578 try {
579 if (rawInstantiate(env, site, sym, argtypes, typeargtypes,
580 allowBoxing, useVarargs, Warner.noWarnings) == null) {
581 // inapplicable
582 switch (bestSoFar.kind) {
583 case ABSENT_MTH: return wrongMethod.setWrongSym(sym);
584 case WRONG_MTH: return wrongMethods;
585 default: return bestSoFar;
586 }
587 }
588 } catch (Infer.InferenceException ex) {
589 switch (bestSoFar.kind) {
590 case ABSENT_MTH:
591 return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
592 case WRONG_MTH:
593 return wrongMethods;
594 default:
595 return bestSoFar;
596 }
597 }
598 if (!isAccessible(env, site, sym)) {
599 return (bestSoFar.kind == ABSENT_MTH)
600 ? new AccessError(env, site, sym)
601 : bestSoFar;
602 }
603 return (bestSoFar.kind > AMBIGUOUS)
604 ? sym
605 : mostSpecific(sym, bestSoFar, env, site,
606 allowBoxing && operator, useVarargs);
607 }
609 /* Return the most specific of the two methods for a call,
610 * given that both are accessible and applicable.
611 * @param m1 A new candidate for most specific.
612 * @param m2 The previous most specific candidate.
613 * @param env The current environment.
614 * @param site The original type from where the selection
615 * takes place.
616 * @param allowBoxing Allow boxing conversions of arguments.
617 * @param useVarargs Box trailing arguments into an array for varargs.
618 */
619 Symbol mostSpecific(Symbol m1,
620 Symbol m2,
621 Env<AttrContext> env,
622 final Type site,
623 boolean allowBoxing,
624 boolean useVarargs) {
625 switch (m2.kind) {
626 case MTH:
627 if (m1 == m2) return m1;
628 Type mt1 = types.memberType(site, m1);
629 noteWarner.unchecked = false;
630 boolean m1SignatureMoreSpecific =
631 (instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
632 allowBoxing, false, noteWarner) != null ||
633 useVarargs && instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
634 allowBoxing, true, noteWarner) != null) &&
635 !noteWarner.unchecked;
636 Type mt2 = types.memberType(site, m2);
637 noteWarner.unchecked = false;
638 boolean m2SignatureMoreSpecific =
639 (instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
640 allowBoxing, false, noteWarner) != null ||
641 useVarargs && instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
642 allowBoxing, true, noteWarner) != null) &&
643 !noteWarner.unchecked;
644 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
645 if (!types.overrideEquivalent(mt1, mt2))
646 return new AmbiguityError(m1, m2);
647 // same signature; select (a) the non-bridge method, or
648 // (b) the one that overrides the other, or (c) the concrete
649 // one, or (d) merge both abstract signatures
650 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE)) {
651 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
652 }
653 // if one overrides or hides the other, use it
654 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
655 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
656 if (types.asSuper(m1Owner.type, m2Owner) != null &&
657 ((m1.owner.flags_field & INTERFACE) == 0 ||
658 (m2.owner.flags_field & INTERFACE) != 0) &&
659 m1.overrides(m2, m1Owner, types, false))
660 return m1;
661 if (types.asSuper(m2Owner.type, m1Owner) != null &&
662 ((m2.owner.flags_field & INTERFACE) == 0 ||
663 (m1.owner.flags_field & INTERFACE) != 0) &&
664 m2.overrides(m1, m2Owner, types, false))
665 return m2;
666 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
667 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
668 if (m1Abstract && !m2Abstract) return m2;
669 if (m2Abstract && !m1Abstract) return m1;
670 // both abstract or both concrete
671 if (!m1Abstract && !m2Abstract)
672 return new AmbiguityError(m1, m2);
673 // check that both signatures have the same erasure
674 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
675 m2.erasure(types).getParameterTypes()))
676 return new AmbiguityError(m1, m2);
677 // both abstract, neither overridden; merge throws clause and result type
678 Symbol mostSpecific;
679 Type result2 = mt2.getReturnType();
680 if (mt2.tag == FORALL)
681 result2 = types.subst(result2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
682 if (types.isSubtype(mt1.getReturnType(), result2)) {
683 mostSpecific = m1;
684 } else if (types.isSubtype(result2, mt1.getReturnType())) {
685 mostSpecific = m2;
686 } else {
687 // Theoretically, this can't happen, but it is possible
688 // due to error recovery or mixing incompatible class files
689 return new AmbiguityError(m1, m2);
690 }
691 MethodSymbol result = new MethodSymbol(
692 mostSpecific.flags(),
693 mostSpecific.name,
694 null,
695 mostSpecific.owner) {
696 @Override
697 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
698 if (origin == site.tsym)
699 return this;
700 else
701 return super.implementation(origin, types, checkResult);
702 }
703 };
704 result.type = (Type)mostSpecific.type.clone();
705 result.type.setThrown(chk.intersect(mt1.getThrownTypes(),
706 mt2.getThrownTypes()));
707 return result;
708 }
709 if (m1SignatureMoreSpecific) return m1;
710 if (m2SignatureMoreSpecific) return m2;
711 return new AmbiguityError(m1, m2);
712 case AMBIGUOUS:
713 AmbiguityError e = (AmbiguityError)m2;
714 Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
715 Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
716 if (err1 == err2) return err1;
717 if (err1 == e.sym && err2 == e.sym2) return m2;
718 if (err1 instanceof AmbiguityError &&
719 err2 instanceof AmbiguityError &&
720 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
721 return new AmbiguityError(m1, m2);
722 else
723 return new AmbiguityError(err1, err2);
724 default:
725 throw new AssertionError();
726 }
727 }
729 /** Find best qualified method matching given name, type and value
730 * arguments.
731 * @param env The current environment.
732 * @param site The original type from where the selection
733 * takes place.
734 * @param name The method's name.
735 * @param argtypes The method's value arguments.
736 * @param typeargtypes The method's type arguments
737 * @param allowBoxing Allow boxing conversions of arguments.
738 * @param useVarargs Box trailing arguments into an array for varargs.
739 */
740 Symbol findMethod(Env<AttrContext> env,
741 Type site,
742 Name name,
743 List<Type> argtypes,
744 List<Type> typeargtypes,
745 boolean allowBoxing,
746 boolean useVarargs,
747 boolean operator) {
748 return findMethod(env,
749 site,
750 name,
751 argtypes,
752 typeargtypes,
753 site.tsym.type,
754 true,
755 methodNotFound,
756 allowBoxing,
757 useVarargs,
758 operator);
759 }
760 // where
761 private Symbol findMethod(Env<AttrContext> env,
762 Type site,
763 Name name,
764 List<Type> argtypes,
765 List<Type> typeargtypes,
766 Type intype,
767 boolean abstractok,
768 Symbol bestSoFar,
769 boolean allowBoxing,
770 boolean useVarargs,
771 boolean operator) {
772 for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
773 while (ct.tag == TYPEVAR)
774 ct = ct.getUpperBound();
775 ClassSymbol c = (ClassSymbol)ct.tsym;
776 if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
777 abstractok = false;
778 for (Scope.Entry e = c.members().lookup(name);
779 e.scope != null;
780 e = e.next()) {
781 //- System.out.println(" e " + e.sym);
782 if (e.sym.kind == MTH &&
783 (e.sym.flags_field & SYNTHETIC) == 0) {
784 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
785 e.sym, bestSoFar,
786 allowBoxing,
787 useVarargs,
788 operator);
789 }
790 }
791 if (name == names.init)
792 break;
793 //- System.out.println(" - " + bestSoFar);
794 if (abstractok) {
795 Symbol concrete = methodNotFound;
796 if ((bestSoFar.flags() & ABSTRACT) == 0)
797 concrete = bestSoFar;
798 for (List<Type> l = types.interfaces(c.type);
799 l.nonEmpty();
800 l = l.tail) {
801 bestSoFar = findMethod(env, site, name, argtypes,
802 typeargtypes,
803 l.head, abstractok, bestSoFar,
804 allowBoxing, useVarargs, operator);
805 }
806 if (concrete != bestSoFar &&
807 concrete.kind < ERR && bestSoFar.kind < ERR &&
808 types.isSubSignature(concrete.type, bestSoFar.type))
809 bestSoFar = concrete;
810 }
811 }
812 return bestSoFar;
813 }
815 /** Find unqualified method matching given name, type and value arguments.
816 * @param env The current environment.
817 * @param name The method's name.
818 * @param argtypes The method's value arguments.
819 * @param typeargtypes The method's type arguments.
820 * @param allowBoxing Allow boxing conversions of arguments.
821 * @param useVarargs Box trailing arguments into an array for varargs.
822 */
823 Symbol findFun(Env<AttrContext> env, Name name,
824 List<Type> argtypes, List<Type> typeargtypes,
825 boolean allowBoxing, boolean useVarargs) {
826 Symbol bestSoFar = methodNotFound;
827 Symbol sym;
828 Env<AttrContext> env1 = env;
829 boolean staticOnly = false;
830 while (env1.outer != null) {
831 if (isStatic(env1)) staticOnly = true;
832 sym = findMethod(
833 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
834 allowBoxing, useVarargs, false);
835 if (sym.exists()) {
836 if (staticOnly &&
837 sym.kind == MTH &&
838 sym.owner.kind == TYP &&
839 (sym.flags() & STATIC) == 0) return new StaticError(sym);
840 else return sym;
841 } else if (sym.kind < bestSoFar.kind) {
842 bestSoFar = sym;
843 }
844 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
845 env1 = env1.outer;
846 }
848 sym = findMethod(env, syms.predefClass.type, name, argtypes,
849 typeargtypes, allowBoxing, useVarargs, false);
850 if (sym.exists())
851 return sym;
853 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
854 for (; e.scope != null; e = e.next()) {
855 sym = e.sym;
856 Type origin = e.getOrigin().owner.type;
857 if (sym.kind == MTH) {
858 if (e.sym.owner.type != origin)
859 sym = sym.clone(e.getOrigin().owner);
860 if (!isAccessible(env, origin, sym))
861 sym = new AccessError(env, origin, sym);
862 bestSoFar = selectBest(env, origin,
863 argtypes, typeargtypes,
864 sym, bestSoFar,
865 allowBoxing, useVarargs, false);
866 }
867 }
868 if (bestSoFar.exists())
869 return bestSoFar;
871 e = env.toplevel.starImportScope.lookup(name);
872 for (; e.scope != null; e = e.next()) {
873 sym = e.sym;
874 Type origin = e.getOrigin().owner.type;
875 if (sym.kind == MTH) {
876 if (e.sym.owner.type != origin)
877 sym = sym.clone(e.getOrigin().owner);
878 if (!isAccessible(env, origin, sym))
879 sym = new AccessError(env, origin, sym);
880 bestSoFar = selectBest(env, origin,
881 argtypes, typeargtypes,
882 sym, bestSoFar,
883 allowBoxing, useVarargs, false);
884 }
885 }
886 return bestSoFar;
887 }
889 /** Find or create an implicit method of exactly the given type (after erasure).
890 * Searches in a side table, not the main scope of the site.
891 * This emulates the lookup process required by JSR 292 in JVM.
892 * @param env The current environment.
893 * @param site The original type from where the selection
894 * takes place.
895 * @param name The method's name.
896 * @param argtypes The method's value arguments.
897 * @param typeargtypes The method's type arguments
898 */
899 Symbol findImplicitMethod(Env<AttrContext> env,
900 Type site,
901 Name name,
902 List<Type> argtypes,
903 List<Type> typeargtypes) {
904 assert allowInvokedynamic;
905 assert site == syms.invokeDynamicType || (site == syms.methodHandleType && name == names.invoke);
906 ClassSymbol c = (ClassSymbol) site.tsym;
907 Scope implicit = c.members().next;
908 if (implicit == null) {
909 c.members().next = implicit = new Scope(c);
910 }
911 Type restype;
912 if (typeargtypes.isEmpty()) {
913 restype = syms.objectType;
914 } else {
915 restype = typeargtypes.head;
916 if (!typeargtypes.tail.isEmpty())
917 return methodNotFound;
918 }
919 List<Type> paramtypes = Type.map(argtypes, implicitArgType);
920 MethodType mtype = new MethodType(paramtypes,
921 restype,
922 List.<Type>nil(),
923 syms.methodClass);
924 int flags = PUBLIC | ABSTRACT;
925 if (site == syms.invokeDynamicType) flags |= STATIC;
926 Symbol m = null;
927 for (Scope.Entry e = implicit.lookup(name);
928 e.scope != null;
929 e = e.next()) {
930 Symbol sym = e.sym;
931 assert sym.kind == MTH;
932 if (types.isSameType(mtype, sym.type)
933 && (sym.flags() & STATIC) == (flags & STATIC)) {
934 m = sym;
935 break;
936 }
937 }
938 if (m == null) {
939 // create the desired method
940 m = new MethodSymbol(flags, name, mtype, c);
941 implicit.enter(m);
942 }
943 assert argumentsAcceptable(argtypes, types.memberType(site, m).getParameterTypes(),
944 false, false, Warner.noWarnings);
945 assert null != instantiate(env, site, m, argtypes, typeargtypes, false, false, Warner.noWarnings);
946 return m;
947 }
948 //where
949 Mapping implicitArgType = new Mapping ("implicitArgType") {
950 public Type apply(Type t) { return implicitArgType(t); }
951 };
952 Type implicitArgType(Type argType) {
953 argType = types.erasure(argType);
954 if (argType.tag == BOT)
955 // nulls type as the marker type Null (which has no instances)
956 // TO DO: figure out how to access java.lang.Null safely, else throw nice error
957 //argType = types.boxedClass(syms.botType).type;
958 argType = types.boxedClass(syms.voidType).type; // REMOVE
959 return argType;
960 }
962 /** Load toplevel or member class with given fully qualified name and
963 * verify that it is accessible.
964 * @param env The current environment.
965 * @param name The fully qualified name of the class to be loaded.
966 */
967 Symbol loadClass(Env<AttrContext> env, Name name) {
968 try {
969 ClassSymbol c = reader.loadClass(name);
970 return isAccessible(env, c) ? c : new AccessError(c);
971 } catch (ClassReader.BadClassFile err) {
972 throw err;
973 } catch (CompletionFailure ex) {
974 return typeNotFound;
975 }
976 }
978 /** Find qualified member type.
979 * @param env The current environment.
980 * @param site The original type from where the selection takes
981 * place.
982 * @param name The type's name.
983 * @param c The class to search for the member type. This is
984 * always a superclass or implemented interface of
985 * site's class.
986 */
987 Symbol findMemberType(Env<AttrContext> env,
988 Type site,
989 Name name,
990 TypeSymbol c) {
991 Symbol bestSoFar = typeNotFound;
992 Symbol sym;
993 Scope.Entry e = c.members().lookup(name);
994 while (e.scope != null) {
995 if (e.sym.kind == TYP) {
996 return isAccessible(env, site, e.sym)
997 ? e.sym
998 : new AccessError(env, site, e.sym);
999 }
1000 e = e.next();
1001 }
1002 Type st = types.supertype(c.type);
1003 if (st != null && st.tag == CLASS) {
1004 sym = findMemberType(env, site, name, st.tsym);
1005 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1006 }
1007 for (List<Type> l = types.interfaces(c.type);
1008 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1009 l = l.tail) {
1010 sym = findMemberType(env, site, name, l.head.tsym);
1011 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1012 sym.owner != bestSoFar.owner)
1013 bestSoFar = new AmbiguityError(bestSoFar, sym);
1014 else if (sym.kind < bestSoFar.kind)
1015 bestSoFar = sym;
1016 }
1017 return bestSoFar;
1018 }
1020 /** Find a global type in given scope and load corresponding class.
1021 * @param env The current environment.
1022 * @param scope The scope in which to look for the type.
1023 * @param name The type's name.
1024 */
1025 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1026 Symbol bestSoFar = typeNotFound;
1027 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1028 Symbol sym = loadClass(env, e.sym.flatName());
1029 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1030 bestSoFar != sym)
1031 return new AmbiguityError(bestSoFar, sym);
1032 else if (sym.kind < bestSoFar.kind)
1033 bestSoFar = sym;
1034 }
1035 return bestSoFar;
1036 }
1038 /** Find an unqualified type symbol.
1039 * @param env The current environment.
1040 * @param name The type's name.
1041 */
1042 Symbol findType(Env<AttrContext> env, Name name) {
1043 Symbol bestSoFar = typeNotFound;
1044 Symbol sym;
1045 boolean staticOnly = false;
1046 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1047 if (isStatic(env1)) staticOnly = true;
1048 for (Scope.Entry e = env1.info.scope.lookup(name);
1049 e.scope != null;
1050 e = e.next()) {
1051 if (e.sym.kind == TYP) {
1052 if (staticOnly &&
1053 e.sym.type.tag == TYPEVAR &&
1054 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1055 return e.sym;
1056 }
1057 }
1059 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1060 env1.enclClass.sym);
1061 if (staticOnly && sym.kind == TYP &&
1062 sym.type.tag == CLASS &&
1063 sym.type.getEnclosingType().tag == CLASS &&
1064 env1.enclClass.sym.type.isParameterized() &&
1065 sym.type.getEnclosingType().isParameterized())
1066 return new StaticError(sym);
1067 else if (sym.exists()) return sym;
1068 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1070 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1071 if ((encl.sym.flags() & STATIC) != 0)
1072 staticOnly = true;
1073 }
1075 if (env.tree.getTag() != JCTree.IMPORT) {
1076 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1077 if (sym.exists()) return sym;
1078 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1080 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1081 if (sym.exists()) return sym;
1082 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1084 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1085 if (sym.exists()) return sym;
1086 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1087 }
1089 return bestSoFar;
1090 }
1092 /** Find an unqualified identifier which matches a specified kind set.
1093 * @param env The current environment.
1094 * @param name The indentifier's name.
1095 * @param kind Indicates the possible symbol kinds
1096 * (a subset of VAL, TYP, PCK).
1097 */
1098 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1099 Symbol bestSoFar = typeNotFound;
1100 Symbol sym;
1102 if ((kind & VAR) != 0) {
1103 sym = findVar(env, name);
1104 if (sym.exists()) return sym;
1105 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1106 }
1108 if ((kind & TYP) != 0) {
1109 sym = findType(env, name);
1110 if (sym.exists()) return sym;
1111 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1112 }
1114 if ((kind & PCK) != 0) return reader.enterPackage(name);
1115 else return bestSoFar;
1116 }
1118 /** Find an identifier in a package which matches a specified kind set.
1119 * @param env The current environment.
1120 * @param name The identifier's name.
1121 * @param kind Indicates the possible symbol kinds
1122 * (a nonempty subset of TYP, PCK).
1123 */
1124 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1125 Name name, int kind) {
1126 Name fullname = TypeSymbol.formFullName(name, pck);
1127 Symbol bestSoFar = typeNotFound;
1128 PackageSymbol pack = null;
1129 if ((kind & PCK) != 0) {
1130 pack = reader.enterPackage(fullname);
1131 if (pack.exists()) return pack;
1132 }
1133 if ((kind & TYP) != 0) {
1134 Symbol sym = loadClass(env, fullname);
1135 if (sym.exists()) {
1136 // don't allow programs to use flatnames
1137 if (name == sym.name) return sym;
1138 }
1139 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1140 }
1141 return (pack != null) ? pack : bestSoFar;
1142 }
1144 /** Find an identifier among the members of a given type `site'.
1145 * @param env The current environment.
1146 * @param site The type containing the symbol to be found.
1147 * @param name The identifier's name.
1148 * @param kind Indicates the possible symbol kinds
1149 * (a subset of VAL, TYP).
1150 */
1151 Symbol findIdentInType(Env<AttrContext> env, Type site,
1152 Name name, int kind) {
1153 Symbol bestSoFar = typeNotFound;
1154 Symbol sym;
1155 if ((kind & VAR) != 0) {
1156 sym = findField(env, site, name, site.tsym);
1157 if (sym.exists()) return sym;
1158 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1159 }
1161 if ((kind & TYP) != 0) {
1162 sym = findMemberType(env, site, name, site.tsym);
1163 if (sym.exists()) return sym;
1164 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1165 }
1166 return bestSoFar;
1167 }
1169 /* ***************************************************************************
1170 * Access checking
1171 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1172 * an error message in the process
1173 ****************************************************************************/
1175 /** If `sym' is a bad symbol: report error and return errSymbol
1176 * else pass through unchanged,
1177 * additional arguments duplicate what has been used in trying to find the
1178 * symbol (--> flyweight pattern). This improves performance since we
1179 * expect misses to happen frequently.
1180 *
1181 * @param sym The symbol that was found, or a ResolveError.
1182 * @param pos The position to use for error reporting.
1183 * @param site The original type from where the selection took place.
1184 * @param name The symbol's name.
1185 * @param argtypes The invocation's value arguments,
1186 * if we looked for a method.
1187 * @param typeargtypes The invocation's type arguments,
1188 * if we looked for a method.
1189 */
1190 Symbol access(Symbol sym,
1191 DiagnosticPosition pos,
1192 Type site,
1193 Name name,
1194 boolean qualified,
1195 List<Type> argtypes,
1196 List<Type> typeargtypes) {
1197 if (sym.kind >= AMBIGUOUS) {
1198 ResolveError errSym = (ResolveError)sym;
1199 if (!site.isErroneous() &&
1200 !Type.isErroneous(argtypes) &&
1201 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
1202 logResolveError(errSym, pos, site, name, argtypes, typeargtypes);
1203 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1204 }
1205 return sym;
1206 }
1208 /** Same as above, but without type arguments and arguments.
1209 */
1210 Symbol access(Symbol sym,
1211 DiagnosticPosition pos,
1212 Type site,
1213 Name name,
1214 boolean qualified) {
1215 if (sym.kind >= AMBIGUOUS)
1216 return access(sym, pos, site, name, qualified, List.<Type>nil(), null);
1217 else
1218 return sym;
1219 }
1221 /** Check that sym is not an abstract method.
1222 */
1223 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1224 if ((sym.flags() & ABSTRACT) != 0)
1225 log.error(pos, "abstract.cant.be.accessed.directly",
1226 kindName(sym), sym, sym.location());
1227 }
1229 /* ***************************************************************************
1230 * Debugging
1231 ****************************************************************************/
1233 /** print all scopes starting with scope s and proceeding outwards.
1234 * used for debugging.
1235 */
1236 public void printscopes(Scope s) {
1237 while (s != null) {
1238 if (s.owner != null)
1239 System.err.print(s.owner + ": ");
1240 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1241 if ((e.sym.flags() & ABSTRACT) != 0)
1242 System.err.print("abstract ");
1243 System.err.print(e.sym + " ");
1244 }
1245 System.err.println();
1246 s = s.next;
1247 }
1248 }
1250 void printscopes(Env<AttrContext> env) {
1251 while (env.outer != null) {
1252 System.err.println("------------------------------");
1253 printscopes(env.info.scope);
1254 env = env.outer;
1255 }
1256 }
1258 public void printscopes(Type t) {
1259 while (t.tag == CLASS) {
1260 printscopes(t.tsym.members());
1261 t = types.supertype(t);
1262 }
1263 }
1265 /* ***************************************************************************
1266 * Name resolution
1267 * Naming conventions are as for symbol lookup
1268 * Unlike the find... methods these methods will report access errors
1269 ****************************************************************************/
1271 /** Resolve an unqualified (non-method) identifier.
1272 * @param pos The position to use for error reporting.
1273 * @param env The environment current at the identifier use.
1274 * @param name The identifier's name.
1275 * @param kind The set of admissible symbol kinds for the identifier.
1276 */
1277 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
1278 Name name, int kind) {
1279 return access(
1280 findIdent(env, name, kind),
1281 pos, env.enclClass.sym.type, name, false);
1282 }
1284 /** Resolve an unqualified method identifier.
1285 * @param pos The position to use for error reporting.
1286 * @param env The environment current at the method invocation.
1287 * @param name The identifier's name.
1288 * @param argtypes The types of the invocation's value arguments.
1289 * @param typeargtypes The types of the invocation's type arguments.
1290 */
1291 Symbol resolveMethod(DiagnosticPosition pos,
1292 Env<AttrContext> env,
1293 Name name,
1294 List<Type> argtypes,
1295 List<Type> typeargtypes) {
1296 Symbol sym = methodNotFound;
1297 List<MethodResolutionPhase> steps = methodResolutionSteps;
1298 while (steps.nonEmpty() &&
1299 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1300 sym.kind >= ERRONEOUS) {
1301 sym = findFun(env, name, argtypes, typeargtypes,
1302 steps.head.isBoxingRequired,
1303 env.info.varArgs = steps.head.isVarargsRequired);
1304 methodResolutionCache.put(steps.head, sym);
1305 steps = steps.tail;
1306 }
1307 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1308 MethodResolutionPhase errPhase =
1309 firstErroneousResolutionPhase();
1310 sym = access(methodResolutionCache.get(errPhase),
1311 pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
1312 env.info.varArgs = errPhase.isVarargsRequired;
1313 }
1314 return sym;
1315 }
1317 /** Resolve a qualified method identifier
1318 * @param pos The position to use for error reporting.
1319 * @param env The environment current at the method invocation.
1320 * @param site The type of the qualifying expression, in which
1321 * identifier is searched.
1322 * @param name The identifier's name.
1323 * @param argtypes The types of the invocation's value arguments.
1324 * @param typeargtypes The types of the invocation's type arguments.
1325 */
1326 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1327 Type site, Name name, List<Type> argtypes,
1328 List<Type> typeargtypes) {
1329 Symbol sym = methodNotFound;
1330 List<MethodResolutionPhase> steps = methodResolutionSteps;
1331 while (steps.nonEmpty() &&
1332 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1333 sym.kind >= ERRONEOUS) {
1334 sym = findMethod(env, site, name, argtypes, typeargtypes,
1335 steps.head.isBoxingRequired(),
1336 env.info.varArgs = steps.head.isVarargsRequired(), false);
1337 methodResolutionCache.put(steps.head, sym);
1338 steps = steps.tail;
1339 }
1340 if (sym.kind >= AMBIGUOUS &&
1341 allowInvokedynamic &&
1342 (site == syms.invokeDynamicType ||
1343 site == syms.methodHandleType && name == names.invoke)) {
1344 // lookup failed; supply an exactly-typed implicit method
1345 sym = findImplicitMethod(env, site, name, argtypes, typeargtypes);
1346 env.info.varArgs = false;
1347 }
1348 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1349 MethodResolutionPhase errPhase =
1350 firstErroneousResolutionPhase();
1351 sym = access(methodResolutionCache.get(errPhase),
1352 pos, site, name, true, argtypes, typeargtypes);
1353 env.info.varArgs = errPhase.isVarargsRequired;
1354 }
1355 return sym;
1356 }
1358 /** Resolve a qualified method identifier, throw a fatal error if not
1359 * found.
1360 * @param pos The position to use for error reporting.
1361 * @param env The environment current at the method invocation.
1362 * @param site The type of the qualifying expression, in which
1363 * identifier is searched.
1364 * @param name The identifier's name.
1365 * @param argtypes The types of the invocation's value arguments.
1366 * @param typeargtypes The types of the invocation's type arguments.
1367 */
1368 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
1369 Type site, Name name,
1370 List<Type> argtypes,
1371 List<Type> typeargtypes) {
1372 Symbol sym = resolveQualifiedMethod(
1373 pos, env, site, name, argtypes, typeargtypes);
1374 if (sym.kind == MTH) return (MethodSymbol)sym;
1375 else throw new FatalError(
1376 diags.fragment("fatal.err.cant.locate.meth",
1377 name));
1378 }
1380 /** Resolve constructor.
1381 * @param pos The position to use for error reporting.
1382 * @param env The environment current at the constructor invocation.
1383 * @param site The type of class for which a constructor is searched.
1384 * @param argtypes The types of the constructor invocation's value
1385 * arguments.
1386 * @param typeargtypes The types of the constructor invocation's type
1387 * arguments.
1388 */
1389 Symbol resolveConstructor(DiagnosticPosition pos,
1390 Env<AttrContext> env,
1391 Type site,
1392 List<Type> argtypes,
1393 List<Type> typeargtypes) {
1394 Symbol sym = methodNotFound;
1395 List<MethodResolutionPhase> steps = methodResolutionSteps;
1396 while (steps.nonEmpty() &&
1397 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1398 sym.kind >= ERRONEOUS) {
1399 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1400 steps.head.isBoxingRequired(),
1401 env.info.varArgs = steps.head.isVarargsRequired());
1402 methodResolutionCache.put(steps.head, sym);
1403 steps = steps.tail;
1404 }
1405 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1406 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1407 sym = access(methodResolutionCache.get(errPhase),
1408 pos, site, names.init, true, argtypes, typeargtypes);
1409 env.info.varArgs = errPhase.isVarargsRequired();
1410 }
1411 return sym;
1412 }
1414 /** Resolve constructor using diamond inference.
1415 * @param pos The position to use for error reporting.
1416 * @param env The environment current at the constructor invocation.
1417 * @param site The type of class for which a constructor is searched.
1418 * The scope of this class has been touched in attribution.
1419 * @param argtypes The types of the constructor invocation's value
1420 * arguments.
1421 * @param typeargtypes The types of the constructor invocation's type
1422 * arguments.
1423 */
1424 Symbol resolveDiamond(DiagnosticPosition pos,
1425 Env<AttrContext> env,
1426 Type site,
1427 List<Type> argtypes,
1428 List<Type> typeargtypes, boolean reportErrors) {
1429 Symbol sym = methodNotFound;
1430 JCDiagnostic explanation = null;
1431 List<MethodResolutionPhase> steps = methodResolutionSteps;
1432 while (steps.nonEmpty() &&
1433 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1434 sym.kind >= ERRONEOUS) {
1435 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1436 steps.head.isBoxingRequired(),
1437 env.info.varArgs = steps.head.isVarargsRequired());
1438 methodResolutionCache.put(steps.head, sym);
1439 if (sym.kind == WRONG_MTH &&
1440 ((InapplicableSymbolError)sym).explanation != null) {
1441 //if the symbol is an inapplicable method symbol, then the
1442 //explanation contains the reason for which inference failed
1443 explanation = ((InapplicableSymbolError)sym).explanation;
1444 }
1445 steps = steps.tail;
1446 }
1447 if (sym.kind >= AMBIGUOUS && reportErrors) {
1448 String key = explanation == null ?
1449 "cant.apply.diamond" :
1450 "cant.apply.diamond.1";
1451 log.error(pos, key, diags.fragment("diamond", site.tsym), explanation);
1452 }
1453 return sym;
1454 }
1456 /** Resolve constructor.
1457 * @param pos The position to use for error reporting.
1458 * @param env The environment current at the constructor invocation.
1459 * @param site The type of class for which a constructor is searched.
1460 * @param argtypes The types of the constructor invocation's value
1461 * arguments.
1462 * @param typeargtypes The types of the constructor invocation's type
1463 * arguments.
1464 * @param allowBoxing Allow boxing and varargs conversions.
1465 * @param useVarargs Box trailing arguments into an array for varargs.
1466 */
1467 Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1468 Type site, List<Type> argtypes,
1469 List<Type> typeargtypes,
1470 boolean allowBoxing,
1471 boolean useVarargs) {
1472 Symbol sym = findMethod(env, site,
1473 names.init, argtypes,
1474 typeargtypes, allowBoxing,
1475 useVarargs, false);
1476 if ((sym.flags() & DEPRECATED) != 0 &&
1477 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
1478 env.info.scope.owner.outermostClass() != sym.outermostClass())
1479 chk.warnDeprecated(pos, sym);
1480 return sym;
1481 }
1483 /** Resolve a constructor, throw a fatal error if not found.
1484 * @param pos The position to use for error reporting.
1485 * @param env The environment current at the method invocation.
1486 * @param site The type to be constructed.
1487 * @param argtypes The types of the invocation's value arguments.
1488 * @param typeargtypes The types of the invocation's type arguments.
1489 */
1490 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1491 Type site,
1492 List<Type> argtypes,
1493 List<Type> typeargtypes) {
1494 Symbol sym = resolveConstructor(
1495 pos, env, site, argtypes, typeargtypes);
1496 if (sym.kind == MTH) return (MethodSymbol)sym;
1497 else throw new FatalError(
1498 diags.fragment("fatal.err.cant.locate.ctor", site));
1499 }
1501 /** Resolve operator.
1502 * @param pos The position to use for error reporting.
1503 * @param optag The tag of the operation tree.
1504 * @param env The environment current at the operation.
1505 * @param argtypes The types of the operands.
1506 */
1507 Symbol resolveOperator(DiagnosticPosition pos, int optag,
1508 Env<AttrContext> env, List<Type> argtypes) {
1509 Name name = treeinfo.operatorName(optag);
1510 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
1511 null, false, false, true);
1512 if (boxingEnabled && sym.kind >= WRONG_MTHS)
1513 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1514 null, true, false, true);
1515 return access(sym, pos, env.enclClass.sym.type, name,
1516 false, argtypes, null);
1517 }
1519 /** Resolve operator.
1520 * @param pos The position to use for error reporting.
1521 * @param optag The tag of the operation tree.
1522 * @param env The environment current at the operation.
1523 * @param arg The type of the operand.
1524 */
1525 Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) {
1526 return resolveOperator(pos, optag, env, List.of(arg));
1527 }
1529 /** Resolve binary operator.
1530 * @param pos The position to use for error reporting.
1531 * @param optag The tag of the operation tree.
1532 * @param env The environment current at the operation.
1533 * @param left The types of the left operand.
1534 * @param right The types of the right operand.
1535 */
1536 Symbol resolveBinaryOperator(DiagnosticPosition pos,
1537 int optag,
1538 Env<AttrContext> env,
1539 Type left,
1540 Type right) {
1541 return resolveOperator(pos, optag, env, List.of(left, right));
1542 }
1544 /**
1545 * Resolve `c.name' where name == this or name == super.
1546 * @param pos The position to use for error reporting.
1547 * @param env The environment current at the expression.
1548 * @param c The qualifier.
1549 * @param name The identifier's name.
1550 */
1551 Symbol resolveSelf(DiagnosticPosition pos,
1552 Env<AttrContext> env,
1553 TypeSymbol c,
1554 Name name) {
1555 Env<AttrContext> env1 = env;
1556 boolean staticOnly = false;
1557 while (env1.outer != null) {
1558 if (isStatic(env1)) staticOnly = true;
1559 if (env1.enclClass.sym == c) {
1560 Symbol sym = env1.info.scope.lookup(name).sym;
1561 if (sym != null) {
1562 if (staticOnly) sym = new StaticError(sym);
1563 return access(sym, pos, env.enclClass.sym.type,
1564 name, true);
1565 }
1566 }
1567 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1568 env1 = env1.outer;
1569 }
1570 log.error(pos, "not.encl.class", c);
1571 return syms.errSymbol;
1572 }
1574 /**
1575 * Resolve `c.this' for an enclosing class c that contains the
1576 * named member.
1577 * @param pos The position to use for error reporting.
1578 * @param env The environment current at the expression.
1579 * @param member The member that must be contained in the result.
1580 */
1581 Symbol resolveSelfContaining(DiagnosticPosition pos,
1582 Env<AttrContext> env,
1583 Symbol member) {
1584 Name name = names._this;
1585 Env<AttrContext> env1 = env;
1586 boolean staticOnly = false;
1587 while (env1.outer != null) {
1588 if (isStatic(env1)) staticOnly = true;
1589 if (env1.enclClass.sym.isSubClass(member.owner, types) &&
1590 isAccessible(env, env1.enclClass.sym.type, member)) {
1591 Symbol sym = env1.info.scope.lookup(name).sym;
1592 if (sym != null) {
1593 if (staticOnly) sym = new StaticError(sym);
1594 return access(sym, pos, env.enclClass.sym.type,
1595 name, true);
1596 }
1597 }
1598 if ((env1.enclClass.sym.flags() & STATIC) != 0)
1599 staticOnly = true;
1600 env1 = env1.outer;
1601 }
1602 log.error(pos, "encl.class.required", member);
1603 return syms.errSymbol;
1604 }
1606 /**
1607 * Resolve an appropriate implicit this instance for t's container.
1608 * JLS2 8.8.5.1 and 15.9.2
1609 */
1610 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
1611 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
1612 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
1613 : resolveSelfContaining(pos, env, t.tsym)).type;
1614 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
1615 log.error(pos, "cant.ref.before.ctor.called", "this");
1616 return thisType;
1617 }
1619 /* ***************************************************************************
1620 * ResolveError classes, indicating error situations when accessing symbols
1621 ****************************************************************************/
1623 public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
1624 AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
1625 logResolveError(error, tree.pos(), type.getEnclosingType(), null, null, null);
1626 }
1627 //where
1628 private void logResolveError(ResolveError error,
1629 DiagnosticPosition pos,
1630 Type site,
1631 Name name,
1632 List<Type> argtypes,
1633 List<Type> typeargtypes) {
1634 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
1635 pos, site, name, argtypes, typeargtypes);
1636 if (d != null)
1637 log.report(d);
1638 }
1640 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
1642 public Object methodArguments(List<Type> argtypes) {
1643 return argtypes.isEmpty() ? noArgs : argtypes;
1644 }
1646 /**
1647 * Root class for resolution errors. Subclass of ResolveError
1648 * represent a different kinds of resolution error - as such they must
1649 * specify how they map into concrete compiler diagnostics.
1650 */
1651 private abstract class ResolveError extends Symbol {
1653 /** The name of the kind of error, for debugging only. */
1654 final String debugName;
1656 ResolveError(int kind, String debugName) {
1657 super(kind, 0, null, null, null);
1658 this.debugName = debugName;
1659 }
1661 @Override
1662 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1663 throw new AssertionError();
1664 }
1666 @Override
1667 public String toString() {
1668 return debugName;
1669 }
1671 @Override
1672 public boolean exists() {
1673 return false;
1674 }
1676 /**
1677 * Create an external representation for this erroneous symbol to be
1678 * used during attribution - by default this returns the symbol of a
1679 * brand new error type which stores the original type found
1680 * during resolution.
1681 *
1682 * @param name the name used during resolution
1683 * @param location the location from which the symbol is accessed
1684 */
1685 protected Symbol access(Name name, TypeSymbol location) {
1686 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1687 }
1689 /**
1690 * Create a diagnostic representing this resolution error.
1691 *
1692 * @param dkind The kind of the diagnostic to be created (e.g error).
1693 * @param pos The position to be used for error reporting.
1694 * @param site The original type from where the selection took place.
1695 * @param name The name of the symbol to be resolved.
1696 * @param argtypes The invocation's value arguments,
1697 * if we looked for a method.
1698 * @param typeargtypes The invocation's type arguments,
1699 * if we looked for a method.
1700 */
1701 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1702 DiagnosticPosition pos,
1703 Type site,
1704 Name name,
1705 List<Type> argtypes,
1706 List<Type> typeargtypes);
1708 /**
1709 * A name designates an operator if it consists
1710 * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
1711 */
1712 boolean isOperator(Name name) {
1713 int i = 0;
1714 while (i < name.getByteLength() &&
1715 "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
1716 return i > 0 && i == name.getByteLength();
1717 }
1718 }
1720 /**
1721 * This class is the root class of all resolution errors caused by
1722 * an invalid symbol being found during resolution.
1723 */
1724 abstract class InvalidSymbolError extends ResolveError {
1726 /** The invalid symbol found during resolution */
1727 Symbol sym;
1729 InvalidSymbolError(int kind, Symbol sym, String debugName) {
1730 super(kind, debugName);
1731 this.sym = sym;
1732 }
1734 @Override
1735 public boolean exists() {
1736 return true;
1737 }
1739 @Override
1740 public String toString() {
1741 return super.toString() + " wrongSym=" + sym;
1742 }
1744 @Override
1745 public Symbol access(Name name, TypeSymbol location) {
1746 if (sym.kind >= AMBIGUOUS)
1747 return ((ResolveError)sym).access(name, location);
1748 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
1749 return types.createErrorType(name, location, sym.type).tsym;
1750 else
1751 return sym;
1752 }
1753 }
1755 /**
1756 * InvalidSymbolError error class indicating that a symbol matching a
1757 * given name does not exists in a given site.
1758 */
1759 class SymbolNotFoundError extends ResolveError {
1761 SymbolNotFoundError(int kind) {
1762 super(kind, "symbol not found error");
1763 }
1765 @Override
1766 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1767 DiagnosticPosition pos,
1768 Type site,
1769 Name name,
1770 List<Type> argtypes,
1771 List<Type> typeargtypes) {
1772 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
1773 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
1774 if (name == names.error)
1775 return null;
1777 if (isOperator(name)) {
1778 return diags.create(dkind, false, log.currentSource(), pos,
1779 "operator.cant.be.applied", name, argtypes);
1780 }
1781 boolean hasLocation = false;
1782 if (!site.tsym.name.isEmpty()) {
1783 if (site.tsym.kind == PCK && !site.tsym.exists()) {
1784 return diags.create(dkind, false, log.currentSource(), pos,
1785 "doesnt.exist", site.tsym);
1786 }
1787 hasLocation = true;
1788 }
1789 boolean isConstructor = kind == ABSENT_MTH &&
1790 name == names.table.names.init;
1791 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
1792 Name idname = isConstructor ? site.tsym.name : name;
1793 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
1794 if (hasLocation) {
1795 return diags.create(dkind, false, log.currentSource(), pos,
1796 errKey, kindname, idname, //symbol kindname, name
1797 typeargtypes, argtypes, //type parameters and arguments (if any)
1798 typeKindName(site), site); //location kindname, type
1799 }
1800 else {
1801 return diags.create(dkind, false, log.currentSource(), pos,
1802 errKey, kindname, idname, //symbol kindname, name
1803 typeargtypes, argtypes); //type parameters and arguments (if any)
1804 }
1805 }
1806 //where
1807 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
1808 String key = "cant.resolve";
1809 String suffix = hasLocation ? ".location" : "";
1810 switch (kindname) {
1811 case METHOD:
1812 case CONSTRUCTOR: {
1813 suffix += ".args";
1814 suffix += hasTypeArgs ? ".params" : "";
1815 }
1816 }
1817 return key + suffix;
1818 }
1819 }
1821 /**
1822 * InvalidSymbolError error class indicating that a given symbol
1823 * (either a method, a constructor or an operand) is not applicable
1824 * given an actual arguments/type argument list.
1825 */
1826 class InapplicableSymbolError extends InvalidSymbolError {
1828 /** An auxiliary explanation set in case of instantiation errors. */
1829 JCDiagnostic explanation;
1831 InapplicableSymbolError(Symbol sym) {
1832 super(WRONG_MTH, sym, "inapplicable symbol error");
1833 }
1835 /** Update sym and explanation and return this.
1836 */
1837 InapplicableSymbolError setWrongSym(Symbol sym, JCDiagnostic explanation) {
1838 this.sym = sym;
1839 this.explanation = explanation;
1840 return this;
1841 }
1843 /** Update sym and return this.
1844 */
1845 InapplicableSymbolError setWrongSym(Symbol sym) {
1846 this.sym = sym;
1847 this.explanation = null;
1848 return this;
1849 }
1851 @Override
1852 public String toString() {
1853 return super.toString() + " explanation=" + explanation;
1854 }
1856 @Override
1857 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1858 DiagnosticPosition pos,
1859 Type site,
1860 Name name,
1861 List<Type> argtypes,
1862 List<Type> typeargtypes) {
1863 if (name == names.error)
1864 return null;
1866 if (isOperator(name)) {
1867 return diags.create(dkind, false, log.currentSource(),
1868 pos, "operator.cant.be.applied", name, argtypes);
1869 }
1870 else {
1871 Symbol ws = sym.asMemberOf(site, types);
1872 return diags.create(dkind, false, log.currentSource(), pos,
1873 "cant.apply.symbol" + (explanation != null ? ".1" : ""),
1874 kindName(ws),
1875 ws.name == names.init ? ws.owner.name : ws.name,
1876 methodArguments(ws.type.getParameterTypes()),
1877 methodArguments(argtypes),
1878 kindName(ws.owner),
1879 ws.owner.type,
1880 explanation);
1881 }
1882 }
1884 @Override
1885 public Symbol access(Name name, TypeSymbol location) {
1886 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1887 }
1888 }
1890 /**
1891 * ResolveError error class indicating that a set of symbols
1892 * (either methods, constructors or operands) is not applicable
1893 * given an actual arguments/type argument list.
1894 */
1895 class InapplicableSymbolsError extends ResolveError {
1896 InapplicableSymbolsError(Symbol sym) {
1897 super(WRONG_MTHS, "inapplicable symbols");
1898 }
1900 @Override
1901 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1902 DiagnosticPosition pos,
1903 Type site,
1904 Name name,
1905 List<Type> argtypes,
1906 List<Type> typeargtypes) {
1907 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
1908 site, name, argtypes, typeargtypes);
1909 }
1910 }
1912 /**
1913 * An InvalidSymbolError error class indicating that a symbol is not
1914 * accessible from a given site
1915 */
1916 class AccessError extends InvalidSymbolError {
1918 private Env<AttrContext> env;
1919 private Type site;
1921 AccessError(Symbol sym) {
1922 this(null, null, sym);
1923 }
1925 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
1926 super(HIDDEN, sym, "access error");
1927 this.env = env;
1928 this.site = site;
1929 if (debugResolve)
1930 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
1931 }
1933 @Override
1934 public boolean exists() {
1935 return false;
1936 }
1938 @Override
1939 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1940 DiagnosticPosition pos,
1941 Type site,
1942 Name name,
1943 List<Type> argtypes,
1944 List<Type> typeargtypes) {
1945 if (sym.owner.type.tag == ERROR)
1946 return null;
1948 if (sym.name == names.init && sym.owner != site.tsym) {
1949 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
1950 pos, site, name, argtypes, typeargtypes);
1951 }
1952 else if ((sym.flags() & PUBLIC) != 0
1953 || (env != null && this.site != null
1954 && !isAccessible(env, this.site))) {
1955 return diags.create(dkind, false, log.currentSource(),
1956 pos, "not.def.access.class.intf.cant.access",
1957 sym, sym.location());
1958 }
1959 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
1960 return diags.create(dkind, false, log.currentSource(),
1961 pos, "report.access", sym,
1962 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
1963 sym.location());
1964 }
1965 else {
1966 return diags.create(dkind, false, log.currentSource(),
1967 pos, "not.def.public.cant.access", sym, sym.location());
1968 }
1969 }
1970 }
1972 /**
1973 * InvalidSymbolError error class indicating that an instance member
1974 * has erroneously been accessed from a static context.
1975 */
1976 class StaticError extends InvalidSymbolError {
1978 StaticError(Symbol sym) {
1979 super(STATICERR, sym, "static error");
1980 }
1982 @Override
1983 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1984 DiagnosticPosition pos,
1985 Type site,
1986 Name name,
1987 List<Type> argtypes,
1988 List<Type> typeargtypes) {
1989 Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
1990 ? types.erasure(sym.type).tsym
1991 : sym);
1992 return diags.create(dkind, false, log.currentSource(), pos,
1993 "non-static.cant.be.ref", kindName(sym), errSym);
1994 }
1995 }
1997 /**
1998 * InvalidSymbolError error class indicating that a pair of symbols
1999 * (either methods, constructors or operands) are ambiguous
2000 * given an actual arguments/type argument list.
2001 */
2002 class AmbiguityError extends InvalidSymbolError {
2004 /** The other maximally specific symbol */
2005 Symbol sym2;
2007 AmbiguityError(Symbol sym1, Symbol sym2) {
2008 super(AMBIGUOUS, sym1, "ambiguity error");
2009 this.sym2 = sym2;
2010 }
2012 @Override
2013 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2014 DiagnosticPosition pos,
2015 Type site,
2016 Name name,
2017 List<Type> argtypes,
2018 List<Type> typeargtypes) {
2019 AmbiguityError pair = this;
2020 while (true) {
2021 if (pair.sym.kind == AMBIGUOUS)
2022 pair = (AmbiguityError)pair.sym;
2023 else if (pair.sym2.kind == AMBIGUOUS)
2024 pair = (AmbiguityError)pair.sym2;
2025 else break;
2026 }
2027 Name sname = pair.sym.name;
2028 if (sname == names.init) sname = pair.sym.owner.name;
2029 return diags.create(dkind, false, log.currentSource(),
2030 pos, "ref.ambiguous", sname,
2031 kindName(pair.sym),
2032 pair.sym,
2033 pair.sym.location(site, types),
2034 kindName(pair.sym2),
2035 pair.sym2,
2036 pair.sym2.location(site, types));
2037 }
2038 }
2040 enum MethodResolutionPhase {
2041 BASIC(false, false),
2042 BOX(true, false),
2043 VARARITY(true, true);
2045 boolean isBoxingRequired;
2046 boolean isVarargsRequired;
2048 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
2049 this.isBoxingRequired = isBoxingRequired;
2050 this.isVarargsRequired = isVarargsRequired;
2051 }
2053 public boolean isBoxingRequired() {
2054 return isBoxingRequired;
2055 }
2057 public boolean isVarargsRequired() {
2058 return isVarargsRequired;
2059 }
2061 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
2062 return (varargsEnabled || !isVarargsRequired) &&
2063 (boxingEnabled || !isBoxingRequired);
2064 }
2065 }
2067 private Map<MethodResolutionPhase, Symbol> methodResolutionCache =
2068 new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length);
2070 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
2072 private MethodResolutionPhase firstErroneousResolutionPhase() {
2073 MethodResolutionPhase bestSoFar = BASIC;
2074 Symbol sym = methodNotFound;
2075 List<MethodResolutionPhase> steps = methodResolutionSteps;
2076 while (steps.nonEmpty() &&
2077 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
2078 sym.kind >= WRONG_MTHS) {
2079 sym = methodResolutionCache.get(steps.head);
2080 bestSoFar = steps.head;
2081 steps = steps.tail;
2082 }
2083 return bestSoFar;
2084 }
2085 }
