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src/share/classes/com/sun/tools/javac/comp/Resolve.java@77cc34d5e548
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Sat, 18 Sep 2010 09:56:23 -0700
- author
- mcimadamore
- date
- Sat, 18 Sep 2010 09:56:23 -0700
- changeset 689
- 77cc34d5e548
- parent 674
- 584365f256a7
- child 700
- 7b413ac1a720
- permissions
- -rw-r--r--
5088624: cannot find symbol message should be more intelligent
Summary: Resolve.java should keep track of all candidates found during a method resolution sweep to generate more meaningful diagnostics
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 com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
44 import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
45 import javax.lang.model.element.ElementVisitor;
47 import java.util.Map;
48 import java.util.HashMap;
50 /** Helper class for name resolution, used mostly by the attribution phase.
51 *
52 * <p><b>This is NOT part of any supported API.
53 * If you write code that depends on this, you do so at your own risk.
54 * This code and its internal interfaces are subject to change or
55 * deletion without notice.</b>
56 */
57 public class Resolve {
58 protected static final Context.Key<Resolve> resolveKey =
59 new Context.Key<Resolve>();
61 Names names;
62 Log log;
63 Symtab syms;
64 Check chk;
65 Infer infer;
66 ClassReader reader;
67 TreeInfo treeinfo;
68 Types types;
69 JCDiagnostic.Factory diags;
70 public final boolean boxingEnabled; // = source.allowBoxing();
71 public final boolean varargsEnabled; // = source.allowVarargs();
72 public final boolean allowMethodHandles;
73 public final boolean allowInvokeDynamic;
74 public final boolean allowTransitionalJSR292;
75 private final boolean debugResolve;
77 Scope polymorphicSignatureScope;
79 public static Resolve instance(Context context) {
80 Resolve instance = context.get(resolveKey);
81 if (instance == null)
82 instance = new Resolve(context);
83 return instance;
84 }
86 protected Resolve(Context context) {
87 context.put(resolveKey, this);
88 syms = Symtab.instance(context);
90 varNotFound = new
91 SymbolNotFoundError(ABSENT_VAR);
92 wrongMethod = new
93 InapplicableSymbolError(syms.errSymbol);
94 wrongMethods = new
95 InapplicableSymbolsError(syms.errSymbol);
96 methodNotFound = new
97 SymbolNotFoundError(ABSENT_MTH);
98 typeNotFound = new
99 SymbolNotFoundError(ABSENT_TYP);
101 names = Names.instance(context);
102 log = Log.instance(context);
103 chk = Check.instance(context);
104 infer = Infer.instance(context);
105 reader = ClassReader.instance(context);
106 treeinfo = TreeInfo.instance(context);
107 types = Types.instance(context);
108 diags = JCDiagnostic.Factory.instance(context);
109 Source source = Source.instance(context);
110 boxingEnabled = source.allowBoxing();
111 varargsEnabled = source.allowVarargs();
112 Options options = Options.instance(context);
113 debugResolve = options.get("debugresolve") != null;
114 allowTransitionalJSR292 = options.get("allowTransitionalJSR292") != null;
115 Target target = Target.instance(context);
116 allowMethodHandles = allowTransitionalJSR292 ||
117 target.hasMethodHandles();
118 allowInvokeDynamic = (allowTransitionalJSR292 ||
119 target.hasInvokedynamic()) &&
120 options.get("invokedynamic") != null;
121 polymorphicSignatureScope = new Scope(syms.noSymbol);
123 inapplicableMethodException = new InapplicableMethodException(diags);
124 }
126 /** error symbols, which are returned when resolution fails
127 */
128 final SymbolNotFoundError varNotFound;
129 final InapplicableSymbolError wrongMethod;
130 final InapplicableSymbolsError wrongMethods;
131 final SymbolNotFoundError methodNotFound;
132 final SymbolNotFoundError typeNotFound;
134 /* ************************************************************************
135 * Identifier resolution
136 *************************************************************************/
138 /** An environment is "static" if its static level is greater than
139 * the one of its outer environment
140 */
141 static boolean isStatic(Env<AttrContext> env) {
142 return env.info.staticLevel > env.outer.info.staticLevel;
143 }
145 /** An environment is an "initializer" if it is a constructor or
146 * an instance initializer.
147 */
148 static boolean isInitializer(Env<AttrContext> env) {
149 Symbol owner = env.info.scope.owner;
150 return owner.isConstructor() ||
151 owner.owner.kind == TYP &&
152 (owner.kind == VAR ||
153 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
154 (owner.flags() & STATIC) == 0;
155 }
157 /** Is class accessible in given evironment?
158 * @param env The current environment.
159 * @param c The class whose accessibility is checked.
160 */
161 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
162 switch ((short)(c.flags() & AccessFlags)) {
163 case PRIVATE:
164 return
165 env.enclClass.sym.outermostClass() ==
166 c.owner.outermostClass();
167 case 0:
168 return
169 env.toplevel.packge == c.owner // fast special case
170 ||
171 env.toplevel.packge == c.packge()
172 ||
173 // Hack: this case is added since synthesized default constructors
174 // of anonymous classes should be allowed to access
175 // classes which would be inaccessible otherwise.
176 env.enclMethod != null &&
177 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
178 default: // error recovery
179 case PUBLIC:
180 return true;
181 case PROTECTED:
182 return
183 env.toplevel.packge == c.owner // fast special case
184 ||
185 env.toplevel.packge == c.packge()
186 ||
187 isInnerSubClass(env.enclClass.sym, c.owner);
188 }
189 }
190 //where
191 /** Is given class a subclass of given base class, or an inner class
192 * of a subclass?
193 * Return null if no such class exists.
194 * @param c The class which is the subclass or is contained in it.
195 * @param base The base class
196 */
197 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
198 while (c != null && !c.isSubClass(base, types)) {
199 c = c.owner.enclClass();
200 }
201 return c != null;
202 }
204 boolean isAccessible(Env<AttrContext> env, Type t) {
205 return (t.tag == ARRAY)
206 ? isAccessible(env, types.elemtype(t))
207 : isAccessible(env, t.tsym);
208 }
210 /** Is symbol accessible as a member of given type in given evironment?
211 * @param env The current environment.
212 * @param site The type of which the tested symbol is regarded
213 * as a member.
214 * @param sym The symbol.
215 */
216 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
217 if (sym.name == names.init && sym.owner != site.tsym) return false;
218 ClassSymbol sub;
219 switch ((short)(sym.flags() & AccessFlags)) {
220 case PRIVATE:
221 return
222 (env.enclClass.sym == sym.owner // fast special case
223 ||
224 env.enclClass.sym.outermostClass() ==
225 sym.owner.outermostClass())
226 &&
227 sym.isInheritedIn(site.tsym, types);
228 case 0:
229 return
230 (env.toplevel.packge == sym.owner.owner // fast special case
231 ||
232 env.toplevel.packge == sym.packge())
233 &&
234 isAccessible(env, site)
235 &&
236 sym.isInheritedIn(site.tsym, types)
237 &&
238 notOverriddenIn(site, sym);
239 case PROTECTED:
240 return
241 (env.toplevel.packge == sym.owner.owner // fast special case
242 ||
243 env.toplevel.packge == sym.packge()
244 ||
245 isProtectedAccessible(sym, env.enclClass.sym, site)
246 ||
247 // OK to select instance method or field from 'super' or type name
248 // (but type names should be disallowed elsewhere!)
249 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
250 &&
251 isAccessible(env, site)
252 &&
253 notOverriddenIn(site, sym);
254 default: // this case includes erroneous combinations as well
255 return isAccessible(env, site) && notOverriddenIn(site, sym);
256 }
257 }
258 //where
259 /* `sym' is accessible only if not overridden by
260 * another symbol which is a member of `site'
261 * (because, if it is overridden, `sym' is not strictly
262 * speaking a member of `site'). A polymorphic signature method
263 * cannot be overridden (e.g. MH.invokeExact(Object[])).
264 */
265 private boolean notOverriddenIn(Type site, Symbol sym) {
266 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
267 return true;
268 else {
269 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
270 return (s2 == null || s2 == sym ||
271 s2.isPolymorphicSignatureGeneric() ||
272 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
273 }
274 }
275 //where
276 /** Is given protected symbol accessible if it is selected from given site
277 * and the selection takes place in given class?
278 * @param sym The symbol with protected access
279 * @param c The class where the access takes place
280 * @site The type of the qualifier
281 */
282 private
283 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
284 while (c != null &&
285 !(c.isSubClass(sym.owner, types) &&
286 (c.flags() & INTERFACE) == 0 &&
287 // In JLS 2e 6.6.2.1, the subclass restriction applies
288 // only to instance fields and methods -- types are excluded
289 // regardless of whether they are declared 'static' or not.
290 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
291 c = c.owner.enclClass();
292 return c != null;
293 }
295 /** Try to instantiate the type of a method so that it fits
296 * given type arguments and argument types. If succesful, return
297 * the method's instantiated type, else return null.
298 * The instantiation will take into account an additional leading
299 * formal parameter if the method is an instance method seen as a member
300 * of un underdetermined site In this case, we treat site as an additional
301 * parameter and the parameters of the class containing the method as
302 * additional type variables that get instantiated.
303 *
304 * @param env The current environment
305 * @param site The type of which the method is a member.
306 * @param m The method symbol.
307 * @param argtypes The invocation's given value arguments.
308 * @param typeargtypes The invocation's given type arguments.
309 * @param allowBoxing Allow boxing conversions of arguments.
310 * @param useVarargs Box trailing arguments into an array for varargs.
311 */
312 Type rawInstantiate(Env<AttrContext> env,
313 Type site,
314 Symbol m,
315 List<Type> argtypes,
316 List<Type> typeargtypes,
317 boolean allowBoxing,
318 boolean useVarargs,
319 Warner warn)
320 throws Infer.InferenceException {
321 boolean polymorphicSignature = (m.isPolymorphicSignatureGeneric() && allowMethodHandles) ||
322 isTransitionalDynamicCallSite(site, m);
323 if (useVarargs && (m.flags() & VARARGS) == 0)
324 throw inapplicableMethodException.setMessage(null);
325 Type mt = types.memberType(site, m);
327 // tvars is the list of formal type variables for which type arguments
328 // need to inferred.
329 List<Type> tvars = env.info.tvars;
330 if (typeargtypes == null) typeargtypes = List.nil();
331 if (allowTransitionalJSR292 && polymorphicSignature && typeargtypes.nonEmpty()) {
332 //transitional 292 call sites might have wrong number of targs
333 }
334 else if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
335 // This is not a polymorphic method, but typeargs are supplied
336 // which is fine, see JLS3 15.12.2.1
337 } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
338 ForAll pmt = (ForAll) mt;
339 if (typeargtypes.length() != pmt.tvars.length())
340 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
341 // Check type arguments are within bounds
342 List<Type> formals = pmt.tvars;
343 List<Type> actuals = typeargtypes;
344 while (formals.nonEmpty() && actuals.nonEmpty()) {
345 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
346 pmt.tvars, typeargtypes);
347 for (; bounds.nonEmpty(); bounds = bounds.tail)
348 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
349 throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
350 formals = formals.tail;
351 actuals = actuals.tail;
352 }
353 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
354 } else if (mt.tag == FORALL) {
355 ForAll pmt = (ForAll) mt;
356 List<Type> tvars1 = types.newInstances(pmt.tvars);
357 tvars = tvars.appendList(tvars1);
358 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
359 }
361 // find out whether we need to go the slow route via infer
362 boolean instNeeded = tvars.tail != null || /*inlined: tvars.nonEmpty()*/
363 polymorphicSignature;
364 for (List<Type> l = argtypes;
365 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
366 l = l.tail) {
367 if (l.head.tag == FORALL) instNeeded = true;
368 }
370 if (instNeeded)
371 return polymorphicSignature ?
372 infer.instantiatePolymorphicSignatureInstance(env, site, m.name, (MethodSymbol)m, argtypes, typeargtypes) :
373 infer.instantiateMethod(env,
374 tvars,
375 (MethodType)mt,
376 m,
377 argtypes,
378 allowBoxing,
379 useVarargs,
380 warn);
382 checkRawArgumentsAcceptable(argtypes, mt.getParameterTypes(),
383 allowBoxing, useVarargs, warn);
384 return mt;
385 }
387 boolean isTransitionalDynamicCallSite(Type site, Symbol sym) {
388 return allowTransitionalJSR292 && // old logic that doesn't use annotations
389 !sym.isPolymorphicSignatureInstance() &&
390 ((allowMethodHandles && site == syms.methodHandleType && // invokeExact, invokeGeneric, invoke
391 (sym.name == names.invoke && sym.isPolymorphicSignatureGeneric())) ||
392 (site == syms.invokeDynamicType && allowInvokeDynamic)); // InvokeDynamic.XYZ
393 }
395 /** Same but returns null instead throwing a NoInstanceException
396 */
397 Type instantiate(Env<AttrContext> env,
398 Type site,
399 Symbol m,
400 List<Type> argtypes,
401 List<Type> typeargtypes,
402 boolean allowBoxing,
403 boolean useVarargs,
404 Warner warn) {
405 try {
406 return rawInstantiate(env, site, m, argtypes, typeargtypes,
407 allowBoxing, useVarargs, warn);
408 } catch (InapplicableMethodException ex) {
409 return null;
410 }
411 }
413 /** Check if a parameter list accepts a list of args.
414 */
415 boolean argumentsAcceptable(List<Type> argtypes,
416 List<Type> formals,
417 boolean allowBoxing,
418 boolean useVarargs,
419 Warner warn) {
420 try {
421 checkRawArgumentsAcceptable(argtypes, formals, allowBoxing, useVarargs, warn);
422 return true;
423 } catch (InapplicableMethodException ex) {
424 return false;
425 }
426 }
427 void checkRawArgumentsAcceptable(List<Type> argtypes,
428 List<Type> formals,
429 boolean allowBoxing,
430 boolean useVarargs,
431 Warner warn) {
432 Type varargsFormal = useVarargs ? formals.last() : null;
433 if (varargsFormal == null &&
434 argtypes.size() != formals.size()) {
435 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
436 }
438 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
439 boolean works = allowBoxing
440 ? types.isConvertible(argtypes.head, formals.head, warn)
441 : types.isSubtypeUnchecked(argtypes.head, formals.head, warn);
442 if (!works)
443 throw inapplicableMethodException.setMessage("no.conforming.assignment.exists",
444 argtypes.head,
445 formals.head);
446 argtypes = argtypes.tail;
447 formals = formals.tail;
448 }
450 if (formals.head != varargsFormal)
451 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
453 if (useVarargs) {
454 Type elt = types.elemtype(varargsFormal);
455 while (argtypes.nonEmpty()) {
456 if (!types.isConvertible(argtypes.head, elt, warn))
457 throw inapplicableMethodException.setMessage("varargs.argument.mismatch",
458 argtypes.head,
459 elt);
460 argtypes = argtypes.tail;
461 }
462 }
463 return;
464 }
465 // where
466 public static class InapplicableMethodException extends RuntimeException {
467 private static final long serialVersionUID = 0;
469 JCDiagnostic diagnostic;
470 JCDiagnostic.Factory diags;
472 InapplicableMethodException(JCDiagnostic.Factory diags) {
473 this.diagnostic = null;
474 this.diags = diags;
475 }
476 InapplicableMethodException setMessage(String key) {
477 this.diagnostic = key != null ? diags.fragment(key) : null;
478 return this;
479 }
480 InapplicableMethodException setMessage(String key, Object... args) {
481 this.diagnostic = key != null ? diags.fragment(key, args) : null;
482 return this;
483 }
485 public JCDiagnostic getDiagnostic() {
486 return diagnostic;
487 }
488 }
489 private final InapplicableMethodException inapplicableMethodException;
491 /* ***************************************************************************
492 * Symbol lookup
493 * the following naming conventions for arguments are used
494 *
495 * env is the environment where the symbol was mentioned
496 * site is the type of which the symbol is a member
497 * name is the symbol's name
498 * if no arguments are given
499 * argtypes are the value arguments, if we search for a method
500 *
501 * If no symbol was found, a ResolveError detailing the problem is returned.
502 ****************************************************************************/
504 /** Find field. Synthetic fields are always skipped.
505 * @param env The current environment.
506 * @param site The original type from where the selection takes place.
507 * @param name The name of the field.
508 * @param c The class to search for the field. This is always
509 * a superclass or implemented interface of site's class.
510 */
511 Symbol findField(Env<AttrContext> env,
512 Type site,
513 Name name,
514 TypeSymbol c) {
515 while (c.type.tag == TYPEVAR)
516 c = c.type.getUpperBound().tsym;
517 Symbol bestSoFar = varNotFound;
518 Symbol sym;
519 Scope.Entry e = c.members().lookup(name);
520 while (e.scope != null) {
521 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
522 return isAccessible(env, site, e.sym)
523 ? e.sym : new AccessError(env, site, e.sym);
524 }
525 e = e.next();
526 }
527 Type st = types.supertype(c.type);
528 if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
529 sym = findField(env, site, name, st.tsym);
530 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
531 }
532 for (List<Type> l = types.interfaces(c.type);
533 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
534 l = l.tail) {
535 sym = findField(env, site, name, l.head.tsym);
536 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
537 sym.owner != bestSoFar.owner)
538 bestSoFar = new AmbiguityError(bestSoFar, sym);
539 else if (sym.kind < bestSoFar.kind)
540 bestSoFar = sym;
541 }
542 return bestSoFar;
543 }
545 /** Resolve a field identifier, throw a fatal error if not found.
546 * @param pos The position to use for error reporting.
547 * @param env The environment current at the method invocation.
548 * @param site The type of the qualifying expression, in which
549 * identifier is searched.
550 * @param name The identifier's name.
551 */
552 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
553 Type site, Name name) {
554 Symbol sym = findField(env, site, name, site.tsym);
555 if (sym.kind == VAR) return (VarSymbol)sym;
556 else throw new FatalError(
557 diags.fragment("fatal.err.cant.locate.field",
558 name));
559 }
561 /** Find unqualified variable or field with given name.
562 * Synthetic fields always skipped.
563 * @param env The current environment.
564 * @param name The name of the variable or field.
565 */
566 Symbol findVar(Env<AttrContext> env, Name name) {
567 Symbol bestSoFar = varNotFound;
568 Symbol sym;
569 Env<AttrContext> env1 = env;
570 boolean staticOnly = false;
571 while (env1.outer != null) {
572 if (isStatic(env1)) staticOnly = true;
573 Scope.Entry e = env1.info.scope.lookup(name);
574 while (e.scope != null &&
575 (e.sym.kind != VAR ||
576 (e.sym.flags_field & SYNTHETIC) != 0))
577 e = e.next();
578 sym = (e.scope != null)
579 ? e.sym
580 : findField(
581 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
582 if (sym.exists()) {
583 if (staticOnly &&
584 sym.kind == VAR &&
585 sym.owner.kind == TYP &&
586 (sym.flags() & STATIC) == 0)
587 return new StaticError(sym);
588 else
589 return sym;
590 } else if (sym.kind < bestSoFar.kind) {
591 bestSoFar = sym;
592 }
594 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
595 env1 = env1.outer;
596 }
598 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
599 if (sym.exists())
600 return sym;
601 if (bestSoFar.exists())
602 return bestSoFar;
604 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
605 for (; e.scope != null; e = e.next()) {
606 sym = e.sym;
607 Type origin = e.getOrigin().owner.type;
608 if (sym.kind == VAR) {
609 if (e.sym.owner.type != origin)
610 sym = sym.clone(e.getOrigin().owner);
611 return isAccessible(env, origin, sym)
612 ? sym : new AccessError(env, origin, sym);
613 }
614 }
616 Symbol origin = null;
617 e = env.toplevel.starImportScope.lookup(name);
618 for (; e.scope != null; e = e.next()) {
619 sym = e.sym;
620 if (sym.kind != VAR)
621 continue;
622 // invariant: sym.kind == VAR
623 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
624 return new AmbiguityError(bestSoFar, sym);
625 else if (bestSoFar.kind >= VAR) {
626 origin = e.getOrigin().owner;
627 bestSoFar = isAccessible(env, origin.type, sym)
628 ? sym : new AccessError(env, origin.type, sym);
629 }
630 }
631 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
632 return bestSoFar.clone(origin);
633 else
634 return bestSoFar;
635 }
637 Warner noteWarner = new Warner();
639 /** Select the best method for a call site among two choices.
640 * @param env The current environment.
641 * @param site The original type from where the
642 * selection takes place.
643 * @param argtypes The invocation's value arguments,
644 * @param typeargtypes The invocation's type arguments,
645 * @param sym Proposed new best match.
646 * @param bestSoFar Previously found best match.
647 * @param allowBoxing Allow boxing conversions of arguments.
648 * @param useVarargs Box trailing arguments into an array for varargs.
649 */
650 @SuppressWarnings("fallthrough")
651 Symbol selectBest(Env<AttrContext> env,
652 Type site,
653 List<Type> argtypes,
654 List<Type> typeargtypes,
655 Symbol sym,
656 Symbol bestSoFar,
657 boolean allowBoxing,
658 boolean useVarargs,
659 boolean operator) {
660 if (sym.kind == ERR) return bestSoFar;
661 if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
662 assert sym.kind < AMBIGUOUS;
663 try {
664 rawInstantiate(env, site, sym, argtypes, typeargtypes,
665 allowBoxing, useVarargs, Warner.noWarnings);
666 } catch (InapplicableMethodException ex) {
667 switch (bestSoFar.kind) {
668 case ABSENT_MTH:
669 return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
670 case WRONG_MTH:
671 wrongMethods.addCandidate(currentStep, wrongMethod.sym, wrongMethod.explanation);
672 case WRONG_MTHS:
673 return wrongMethods.addCandidate(currentStep, sym, ex.getDiagnostic());
674 default:
675 return bestSoFar;
676 }
677 }
678 if (!isAccessible(env, site, sym)) {
679 return (bestSoFar.kind == ABSENT_MTH)
680 ? new AccessError(env, site, sym)
681 : bestSoFar;
682 }
683 return (bestSoFar.kind > AMBIGUOUS)
684 ? sym
685 : mostSpecific(sym, bestSoFar, env, site,
686 allowBoxing && operator, useVarargs);
687 }
689 /* Return the most specific of the two methods for a call,
690 * given that both are accessible and applicable.
691 * @param m1 A new candidate for most specific.
692 * @param m2 The previous most specific candidate.
693 * @param env The current environment.
694 * @param site The original type from where the selection
695 * takes place.
696 * @param allowBoxing Allow boxing conversions of arguments.
697 * @param useVarargs Box trailing arguments into an array for varargs.
698 */
699 Symbol mostSpecific(Symbol m1,
700 Symbol m2,
701 Env<AttrContext> env,
702 final Type site,
703 boolean allowBoxing,
704 boolean useVarargs) {
705 switch (m2.kind) {
706 case MTH:
707 if (m1 == m2) return m1;
708 Type mt1 = types.memberType(site, m1);
709 noteWarner.unchecked = false;
710 boolean m1SignatureMoreSpecific =
711 (instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
712 allowBoxing, false, noteWarner) != null ||
713 useVarargs && instantiate(env, site, m2, types.lowerBoundArgtypes(mt1), null,
714 allowBoxing, true, noteWarner) != null) &&
715 !noteWarner.unchecked;
716 Type mt2 = types.memberType(site, m2);
717 noteWarner.unchecked = false;
718 boolean m2SignatureMoreSpecific =
719 (instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
720 allowBoxing, false, noteWarner) != null ||
721 useVarargs && instantiate(env, site, m1, types.lowerBoundArgtypes(mt2), null,
722 allowBoxing, true, noteWarner) != null) &&
723 !noteWarner.unchecked;
724 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
725 if (!types.overrideEquivalent(mt1, mt2))
726 return new AmbiguityError(m1, m2);
727 // same signature; select (a) the non-bridge method, or
728 // (b) the one that overrides the other, or (c) the concrete
729 // one, or (d) merge both abstract signatures
730 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE)) {
731 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
732 }
733 // if one overrides or hides the other, use it
734 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
735 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
736 if (types.asSuper(m1Owner.type, m2Owner) != null &&
737 ((m1.owner.flags_field & INTERFACE) == 0 ||
738 (m2.owner.flags_field & INTERFACE) != 0) &&
739 m1.overrides(m2, m1Owner, types, false))
740 return m1;
741 if (types.asSuper(m2Owner.type, m1Owner) != null &&
742 ((m2.owner.flags_field & INTERFACE) == 0 ||
743 (m1.owner.flags_field & INTERFACE) != 0) &&
744 m2.overrides(m1, m2Owner, types, false))
745 return m2;
746 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
747 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
748 if (m1Abstract && !m2Abstract) return m2;
749 if (m2Abstract && !m1Abstract) return m1;
750 // both abstract or both concrete
751 if (!m1Abstract && !m2Abstract)
752 return new AmbiguityError(m1, m2);
753 // check that both signatures have the same erasure
754 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
755 m2.erasure(types).getParameterTypes()))
756 return new AmbiguityError(m1, m2);
757 // both abstract, neither overridden; merge throws clause and result type
758 Symbol mostSpecific;
759 Type result2 = mt2.getReturnType();
760 if (mt2.tag == FORALL)
761 result2 = types.subst(result2, ((ForAll)mt2).tvars, ((ForAll)mt1).tvars);
762 if (types.isSubtype(mt1.getReturnType(), result2)) {
763 mostSpecific = m1;
764 } else if (types.isSubtype(result2, mt1.getReturnType())) {
765 mostSpecific = m2;
766 } else {
767 // Theoretically, this can't happen, but it is possible
768 // due to error recovery or mixing incompatible class files
769 return new AmbiguityError(m1, m2);
770 }
771 MethodSymbol result = new MethodSymbol(
772 mostSpecific.flags(),
773 mostSpecific.name,
774 null,
775 mostSpecific.owner) {
776 @Override
777 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
778 if (origin == site.tsym)
779 return this;
780 else
781 return super.implementation(origin, types, checkResult);
782 }
783 };
784 result.type = (Type)mostSpecific.type.clone();
785 result.type.setThrown(chk.intersect(mt1.getThrownTypes(),
786 mt2.getThrownTypes()));
787 return result;
788 }
789 if (m1SignatureMoreSpecific) return m1;
790 if (m2SignatureMoreSpecific) return m2;
791 return new AmbiguityError(m1, m2);
792 case AMBIGUOUS:
793 AmbiguityError e = (AmbiguityError)m2;
794 Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
795 Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
796 if (err1 == err2) return err1;
797 if (err1 == e.sym && err2 == e.sym2) return m2;
798 if (err1 instanceof AmbiguityError &&
799 err2 instanceof AmbiguityError &&
800 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
801 return new AmbiguityError(m1, m2);
802 else
803 return new AmbiguityError(err1, err2);
804 default:
805 throw new AssertionError();
806 }
807 }
809 /** Find best qualified method matching given name, type and value
810 * arguments.
811 * @param env The current environment.
812 * @param site The original type from where the selection
813 * takes place.
814 * @param name The method's name.
815 * @param argtypes The method's value arguments.
816 * @param typeargtypes The method's type arguments
817 * @param allowBoxing Allow boxing conversions of arguments.
818 * @param useVarargs Box trailing arguments into an array for varargs.
819 */
820 Symbol findMethod(Env<AttrContext> env,
821 Type site,
822 Name name,
823 List<Type> argtypes,
824 List<Type> typeargtypes,
825 boolean allowBoxing,
826 boolean useVarargs,
827 boolean operator) {
828 Symbol bestSoFar = methodNotFound;
829 return findMethod(env,
830 site,
831 name,
832 argtypes,
833 typeargtypes,
834 site.tsym.type,
835 true,
836 bestSoFar,
837 allowBoxing,
838 useVarargs,
839 operator);
840 }
841 // where
842 private Symbol findMethod(Env<AttrContext> env,
843 Type site,
844 Name name,
845 List<Type> argtypes,
846 List<Type> typeargtypes,
847 Type intype,
848 boolean abstractok,
849 Symbol bestSoFar,
850 boolean allowBoxing,
851 boolean useVarargs,
852 boolean operator) {
853 for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
854 while (ct.tag == TYPEVAR)
855 ct = ct.getUpperBound();
856 ClassSymbol c = (ClassSymbol)ct.tsym;
857 if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
858 abstractok = false;
859 for (Scope.Entry e = c.members().lookup(name);
860 e.scope != null;
861 e = e.next()) {
862 //- System.out.println(" e " + e.sym);
863 if (e.sym.kind == MTH &&
864 (e.sym.flags_field & SYNTHETIC) == 0) {
865 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
866 e.sym, bestSoFar,
867 allowBoxing,
868 useVarargs,
869 operator);
870 }
871 }
872 if (name == names.init)
873 break;
874 //- System.out.println(" - " + bestSoFar);
875 if (abstractok) {
876 Symbol concrete = methodNotFound;
877 if ((bestSoFar.flags() & ABSTRACT) == 0)
878 concrete = bestSoFar;
879 for (List<Type> l = types.interfaces(c.type);
880 l.nonEmpty();
881 l = l.tail) {
882 bestSoFar = findMethod(env, site, name, argtypes,
883 typeargtypes,
884 l.head, abstractok, bestSoFar,
885 allowBoxing, useVarargs, operator);
886 }
887 if (concrete != bestSoFar &&
888 concrete.kind < ERR && bestSoFar.kind < ERR &&
889 types.isSubSignature(concrete.type, bestSoFar.type))
890 bestSoFar = concrete;
891 }
892 }
893 return bestSoFar;
894 }
896 /** Find unqualified method matching given name, type and value arguments.
897 * @param env The current environment.
898 * @param name The method's name.
899 * @param argtypes The method's value arguments.
900 * @param typeargtypes The method's type arguments.
901 * @param allowBoxing Allow boxing conversions of arguments.
902 * @param useVarargs Box trailing arguments into an array for varargs.
903 */
904 Symbol findFun(Env<AttrContext> env, Name name,
905 List<Type> argtypes, List<Type> typeargtypes,
906 boolean allowBoxing, boolean useVarargs) {
907 Symbol bestSoFar = methodNotFound;
908 Symbol sym;
909 Env<AttrContext> env1 = env;
910 boolean staticOnly = false;
911 while (env1.outer != null) {
912 if (isStatic(env1)) staticOnly = true;
913 sym = findMethod(
914 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
915 allowBoxing, useVarargs, false);
916 if (sym.exists()) {
917 if (staticOnly &&
918 sym.kind == MTH &&
919 sym.owner.kind == TYP &&
920 (sym.flags() & STATIC) == 0) return new StaticError(sym);
921 else return sym;
922 } else if (sym.kind < bestSoFar.kind) {
923 bestSoFar = sym;
924 }
925 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
926 env1 = env1.outer;
927 }
929 sym = findMethod(env, syms.predefClass.type, name, argtypes,
930 typeargtypes, allowBoxing, useVarargs, false);
931 if (sym.exists())
932 return sym;
934 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
935 for (; e.scope != null; e = e.next()) {
936 sym = e.sym;
937 Type origin = e.getOrigin().owner.type;
938 if (sym.kind == MTH) {
939 if (e.sym.owner.type != origin)
940 sym = sym.clone(e.getOrigin().owner);
941 if (!isAccessible(env, origin, sym))
942 sym = new AccessError(env, origin, sym);
943 bestSoFar = selectBest(env, origin,
944 argtypes, typeargtypes,
945 sym, bestSoFar,
946 allowBoxing, useVarargs, false);
947 }
948 }
949 if (bestSoFar.exists())
950 return bestSoFar;
952 e = env.toplevel.starImportScope.lookup(name);
953 for (; e.scope != null; e = e.next()) {
954 sym = e.sym;
955 Type origin = e.getOrigin().owner.type;
956 if (sym.kind == MTH) {
957 if (e.sym.owner.type != origin)
958 sym = sym.clone(e.getOrigin().owner);
959 if (!isAccessible(env, origin, sym))
960 sym = new AccessError(env, origin, sym);
961 bestSoFar = selectBest(env, origin,
962 argtypes, typeargtypes,
963 sym, bestSoFar,
964 allowBoxing, useVarargs, false);
965 }
966 }
967 return bestSoFar;
968 }
970 /** Load toplevel or member class with given fully qualified name and
971 * verify that it is accessible.
972 * @param env The current environment.
973 * @param name The fully qualified name of the class to be loaded.
974 */
975 Symbol loadClass(Env<AttrContext> env, Name name) {
976 try {
977 ClassSymbol c = reader.loadClass(name);
978 return isAccessible(env, c) ? c : new AccessError(c);
979 } catch (ClassReader.BadClassFile err) {
980 throw err;
981 } catch (CompletionFailure ex) {
982 return typeNotFound;
983 }
984 }
986 /** Find qualified member type.
987 * @param env The current environment.
988 * @param site The original type from where the selection takes
989 * place.
990 * @param name The type's name.
991 * @param c The class to search for the member type. This is
992 * always a superclass or implemented interface of
993 * site's class.
994 */
995 Symbol findMemberType(Env<AttrContext> env,
996 Type site,
997 Name name,
998 TypeSymbol c) {
999 Symbol bestSoFar = typeNotFound;
1000 Symbol sym;
1001 Scope.Entry e = c.members().lookup(name);
1002 while (e.scope != null) {
1003 if (e.sym.kind == TYP) {
1004 return isAccessible(env, site, e.sym)
1005 ? e.sym
1006 : new AccessError(env, site, e.sym);
1007 }
1008 e = e.next();
1009 }
1010 Type st = types.supertype(c.type);
1011 if (st != null && st.tag == CLASS) {
1012 sym = findMemberType(env, site, name, st.tsym);
1013 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1014 }
1015 for (List<Type> l = types.interfaces(c.type);
1016 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1017 l = l.tail) {
1018 sym = findMemberType(env, site, name, l.head.tsym);
1019 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1020 sym.owner != bestSoFar.owner)
1021 bestSoFar = new AmbiguityError(bestSoFar, sym);
1022 else if (sym.kind < bestSoFar.kind)
1023 bestSoFar = sym;
1024 }
1025 return bestSoFar;
1026 }
1028 /** Find a global type in given scope and load corresponding class.
1029 * @param env The current environment.
1030 * @param scope The scope in which to look for the type.
1031 * @param name The type's name.
1032 */
1033 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1034 Symbol bestSoFar = typeNotFound;
1035 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1036 Symbol sym = loadClass(env, e.sym.flatName());
1037 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1038 bestSoFar != sym)
1039 return new AmbiguityError(bestSoFar, sym);
1040 else if (sym.kind < bestSoFar.kind)
1041 bestSoFar = sym;
1042 }
1043 return bestSoFar;
1044 }
1046 /** Find an unqualified type symbol.
1047 * @param env The current environment.
1048 * @param name The type's name.
1049 */
1050 Symbol findType(Env<AttrContext> env, Name name) {
1051 Symbol bestSoFar = typeNotFound;
1052 Symbol sym;
1053 boolean staticOnly = false;
1054 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1055 if (isStatic(env1)) staticOnly = true;
1056 for (Scope.Entry e = env1.info.scope.lookup(name);
1057 e.scope != null;
1058 e = e.next()) {
1059 if (e.sym.kind == TYP) {
1060 if (staticOnly &&
1061 e.sym.type.tag == TYPEVAR &&
1062 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1063 return e.sym;
1064 }
1065 }
1067 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1068 env1.enclClass.sym);
1069 if (staticOnly && sym.kind == TYP &&
1070 sym.type.tag == CLASS &&
1071 sym.type.getEnclosingType().tag == CLASS &&
1072 env1.enclClass.sym.type.isParameterized() &&
1073 sym.type.getEnclosingType().isParameterized())
1074 return new StaticError(sym);
1075 else if (sym.exists()) return sym;
1076 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1078 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1079 if ((encl.sym.flags() & STATIC) != 0)
1080 staticOnly = true;
1081 }
1083 if (env.tree.getTag() != JCTree.IMPORT) {
1084 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1085 if (sym.exists()) return sym;
1086 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1088 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1089 if (sym.exists()) return sym;
1090 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1092 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1093 if (sym.exists()) return sym;
1094 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1095 }
1097 return bestSoFar;
1098 }
1100 /** Find an unqualified identifier which matches a specified kind set.
1101 * @param env The current environment.
1102 * @param name The indentifier's name.
1103 * @param kind Indicates the possible symbol kinds
1104 * (a subset of VAL, TYP, PCK).
1105 */
1106 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1107 Symbol bestSoFar = typeNotFound;
1108 Symbol sym;
1110 if ((kind & VAR) != 0) {
1111 sym = findVar(env, name);
1112 if (sym.exists()) return sym;
1113 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1114 }
1116 if ((kind & TYP) != 0) {
1117 sym = findType(env, name);
1118 if (sym.exists()) return sym;
1119 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1120 }
1122 if ((kind & PCK) != 0) return reader.enterPackage(name);
1123 else return bestSoFar;
1124 }
1126 /** Find an identifier in a package which matches a specified kind set.
1127 * @param env The current environment.
1128 * @param name The identifier's name.
1129 * @param kind Indicates the possible symbol kinds
1130 * (a nonempty subset of TYP, PCK).
1131 */
1132 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1133 Name name, int kind) {
1134 Name fullname = TypeSymbol.formFullName(name, pck);
1135 Symbol bestSoFar = typeNotFound;
1136 PackageSymbol pack = null;
1137 if ((kind & PCK) != 0) {
1138 pack = reader.enterPackage(fullname);
1139 if (pack.exists()) return pack;
1140 }
1141 if ((kind & TYP) != 0) {
1142 Symbol sym = loadClass(env, fullname);
1143 if (sym.exists()) {
1144 // don't allow programs to use flatnames
1145 if (name == sym.name) return sym;
1146 }
1147 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1148 }
1149 return (pack != null) ? pack : bestSoFar;
1150 }
1152 /** Find an identifier among the members of a given type `site'.
1153 * @param env The current environment.
1154 * @param site The type containing the symbol to be found.
1155 * @param name The identifier's name.
1156 * @param kind Indicates the possible symbol kinds
1157 * (a subset of VAL, TYP).
1158 */
1159 Symbol findIdentInType(Env<AttrContext> env, Type site,
1160 Name name, int kind) {
1161 Symbol bestSoFar = typeNotFound;
1162 Symbol sym;
1163 if ((kind & VAR) != 0) {
1164 sym = findField(env, site, name, site.tsym);
1165 if (sym.exists()) return sym;
1166 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1167 }
1169 if ((kind & TYP) != 0) {
1170 sym = findMemberType(env, site, name, site.tsym);
1171 if (sym.exists()) return sym;
1172 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1173 }
1174 return bestSoFar;
1175 }
1177 /* ***************************************************************************
1178 * Access checking
1179 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1180 * an error message in the process
1181 ****************************************************************************/
1183 /** If `sym' is a bad symbol: report error and return errSymbol
1184 * else pass through unchanged,
1185 * additional arguments duplicate what has been used in trying to find the
1186 * symbol (--> flyweight pattern). This improves performance since we
1187 * expect misses to happen frequently.
1188 *
1189 * @param sym The symbol that was found, or a ResolveError.
1190 * @param pos The position to use for error reporting.
1191 * @param site The original type from where the selection took place.
1192 * @param name The symbol's name.
1193 * @param argtypes The invocation's value arguments,
1194 * if we looked for a method.
1195 * @param typeargtypes The invocation's type arguments,
1196 * if we looked for a method.
1197 */
1198 Symbol access(Symbol sym,
1199 DiagnosticPosition pos,
1200 Type site,
1201 Name name,
1202 boolean qualified,
1203 List<Type> argtypes,
1204 List<Type> typeargtypes) {
1205 if (sym.kind >= AMBIGUOUS) {
1206 ResolveError errSym = (ResolveError)sym;
1207 if (!site.isErroneous() &&
1208 !Type.isErroneous(argtypes) &&
1209 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
1210 logResolveError(errSym, pos, site, name, argtypes, typeargtypes);
1211 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1212 }
1213 return sym;
1214 }
1216 /** Same as above, but without type arguments and arguments.
1217 */
1218 Symbol access(Symbol sym,
1219 DiagnosticPosition pos,
1220 Type site,
1221 Name name,
1222 boolean qualified) {
1223 if (sym.kind >= AMBIGUOUS)
1224 return access(sym, pos, site, name, qualified, List.<Type>nil(), null);
1225 else
1226 return sym;
1227 }
1229 /** Check that sym is not an abstract method.
1230 */
1231 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1232 if ((sym.flags() & ABSTRACT) != 0)
1233 log.error(pos, "abstract.cant.be.accessed.directly",
1234 kindName(sym), sym, sym.location());
1235 }
1237 /* ***************************************************************************
1238 * Debugging
1239 ****************************************************************************/
1241 /** print all scopes starting with scope s and proceeding outwards.
1242 * used for debugging.
1243 */
1244 public void printscopes(Scope s) {
1245 while (s != null) {
1246 if (s.owner != null)
1247 System.err.print(s.owner + ": ");
1248 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1249 if ((e.sym.flags() & ABSTRACT) != 0)
1250 System.err.print("abstract ");
1251 System.err.print(e.sym + " ");
1252 }
1253 System.err.println();
1254 s = s.next;
1255 }
1256 }
1258 void printscopes(Env<AttrContext> env) {
1259 while (env.outer != null) {
1260 System.err.println("------------------------------");
1261 printscopes(env.info.scope);
1262 env = env.outer;
1263 }
1264 }
1266 public void printscopes(Type t) {
1267 while (t.tag == CLASS) {
1268 printscopes(t.tsym.members());
1269 t = types.supertype(t);
1270 }
1271 }
1273 /* ***************************************************************************
1274 * Name resolution
1275 * Naming conventions are as for symbol lookup
1276 * Unlike the find... methods these methods will report access errors
1277 ****************************************************************************/
1279 /** Resolve an unqualified (non-method) identifier.
1280 * @param pos The position to use for error reporting.
1281 * @param env The environment current at the identifier use.
1282 * @param name The identifier's name.
1283 * @param kind The set of admissible symbol kinds for the identifier.
1284 */
1285 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
1286 Name name, int kind) {
1287 return access(
1288 findIdent(env, name, kind),
1289 pos, env.enclClass.sym.type, name, false);
1290 }
1292 /** Resolve an unqualified method identifier.
1293 * @param pos The position to use for error reporting.
1294 * @param env The environment current at the method invocation.
1295 * @param name The identifier's name.
1296 * @param argtypes The types of the invocation's value arguments.
1297 * @param typeargtypes The types of the invocation's type arguments.
1298 */
1299 Symbol resolveMethod(DiagnosticPosition pos,
1300 Env<AttrContext> env,
1301 Name name,
1302 List<Type> argtypes,
1303 List<Type> typeargtypes) {
1304 Symbol sym = startResolution();
1305 List<MethodResolutionPhase> steps = methodResolutionSteps;
1306 while (steps.nonEmpty() &&
1307 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1308 sym.kind >= ERRONEOUS) {
1309 currentStep = steps.head;
1310 sym = findFun(env, name, argtypes, typeargtypes,
1311 steps.head.isBoxingRequired,
1312 env.info.varArgs = steps.head.isVarargsRequired);
1313 methodResolutionCache.put(steps.head, sym);
1314 steps = steps.tail;
1315 }
1316 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1317 MethodResolutionPhase errPhase =
1318 firstErroneousResolutionPhase();
1319 sym = access(methodResolutionCache.get(errPhase),
1320 pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
1321 env.info.varArgs = errPhase.isVarargsRequired;
1322 }
1323 return sym;
1324 }
1326 private Symbol startResolution() {
1327 wrongMethod.clear();
1328 wrongMethods.clear();
1329 return methodNotFound;
1330 }
1332 /** Resolve a qualified method identifier
1333 * @param pos The position to use for error reporting.
1334 * @param env The environment current at the method invocation.
1335 * @param site The type of the qualifying expression, in which
1336 * identifier is searched.
1337 * @param name The identifier's name.
1338 * @param argtypes The types of the invocation's value arguments.
1339 * @param typeargtypes The types of the invocation's type arguments.
1340 */
1341 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1342 Type site, Name name, List<Type> argtypes,
1343 List<Type> typeargtypes) {
1344 Symbol sym = startResolution();
1345 List<MethodResolutionPhase> steps = methodResolutionSteps;
1346 while (steps.nonEmpty() &&
1347 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1348 sym.kind >= ERRONEOUS) {
1349 currentStep = steps.head;
1350 sym = findMethod(env, site, name, argtypes, typeargtypes,
1351 steps.head.isBoxingRequired(),
1352 env.info.varArgs = steps.head.isVarargsRequired(), false);
1353 methodResolutionCache.put(steps.head, sym);
1354 steps = steps.tail;
1355 }
1356 if (sym.kind >= AMBIGUOUS) {
1357 if (site.tsym.isPolymorphicSignatureGeneric() ||
1358 isTransitionalDynamicCallSite(site, sym)) {
1359 //polymorphic receiver - synthesize new method symbol
1360 env.info.varArgs = false;
1361 sym = findPolymorphicSignatureInstance(env,
1362 site, name, null, argtypes, typeargtypes);
1363 }
1364 else {
1365 //if nothing is found return the 'first' error
1366 MethodResolutionPhase errPhase =
1367 firstErroneousResolutionPhase();
1368 sym = access(methodResolutionCache.get(errPhase),
1369 pos, site, name, true, argtypes, typeargtypes);
1370 env.info.varArgs = errPhase.isVarargsRequired;
1371 }
1372 } else if (allowMethodHandles && sym.isPolymorphicSignatureGeneric()) {
1373 //non-instantiated polymorphic signature - synthesize new method symbol
1374 env.info.varArgs = false;
1375 sym = findPolymorphicSignatureInstance(env,
1376 site, name, (MethodSymbol)sym, argtypes, typeargtypes);
1377 }
1378 return sym;
1379 }
1381 /** Find or create an implicit method of exactly the given type (after erasure).
1382 * Searches in a side table, not the main scope of the site.
1383 * This emulates the lookup process required by JSR 292 in JVM.
1384 * @param env Attribution environment
1385 * @param site The original type from where the selection takes place.
1386 * @param name The method's name.
1387 * @param spMethod A template for the implicit method, or null.
1388 * @param argtypes The required argument types.
1389 * @param typeargtypes The required type arguments.
1390 */
1391 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env, Type site,
1392 Name name,
1393 MethodSymbol spMethod, // sig. poly. method or null if none
1394 List<Type> argtypes,
1395 List<Type> typeargtypes) {
1396 if (typeargtypes.nonEmpty() && (site.tsym.isPolymorphicSignatureGeneric() ||
1397 (spMethod != null && spMethod.isPolymorphicSignatureGeneric()))) {
1398 log.warning(env.tree.pos(), "type.parameter.on.polymorphic.signature");
1399 }
1401 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
1402 site, name, spMethod, argtypes, typeargtypes);
1403 long flags = ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE |
1404 (spMethod != null ?
1405 spMethod.flags() & Flags.AccessFlags :
1406 Flags.PUBLIC | Flags.STATIC);
1407 Symbol m = null;
1408 for (Scope.Entry e = polymorphicSignatureScope.lookup(name);
1409 e.scope != null;
1410 e = e.next()) {
1411 Symbol sym = e.sym;
1412 if (types.isSameType(mtype, sym.type) &&
1413 (sym.flags() & Flags.STATIC) == (flags & Flags.STATIC) &&
1414 types.isSameType(sym.owner.type, site)) {
1415 m = sym;
1416 break;
1417 }
1418 }
1419 if (m == null) {
1420 // create the desired method
1421 m = new MethodSymbol(flags, name, mtype, site.tsym);
1422 polymorphicSignatureScope.enter(m);
1423 }
1424 return m;
1425 }
1427 /** Resolve a qualified method identifier, throw a fatal error if not
1428 * found.
1429 * @param pos The position to use for error reporting.
1430 * @param env The environment current at the method invocation.
1431 * @param site The type of the qualifying expression, in which
1432 * identifier is searched.
1433 * @param name The identifier's name.
1434 * @param argtypes The types of the invocation's value arguments.
1435 * @param typeargtypes The types of the invocation's type arguments.
1436 */
1437 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
1438 Type site, Name name,
1439 List<Type> argtypes,
1440 List<Type> typeargtypes) {
1441 Symbol sym = resolveQualifiedMethod(
1442 pos, env, site, name, argtypes, typeargtypes);
1443 if (sym.kind == MTH) return (MethodSymbol)sym;
1444 else throw new FatalError(
1445 diags.fragment("fatal.err.cant.locate.meth",
1446 name));
1447 }
1449 /** Resolve constructor.
1450 * @param pos The position to use for error reporting.
1451 * @param env The environment current at the constructor invocation.
1452 * @param site The type of class for which a constructor is searched.
1453 * @param argtypes The types of the constructor invocation's value
1454 * arguments.
1455 * @param typeargtypes The types of the constructor invocation's type
1456 * arguments.
1457 */
1458 Symbol resolveConstructor(DiagnosticPosition pos,
1459 Env<AttrContext> env,
1460 Type site,
1461 List<Type> argtypes,
1462 List<Type> typeargtypes) {
1463 Symbol sym = startResolution();
1464 List<MethodResolutionPhase> steps = methodResolutionSteps;
1465 while (steps.nonEmpty() &&
1466 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1467 sym.kind >= ERRONEOUS) {
1468 currentStep = steps.head;
1469 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1470 steps.head.isBoxingRequired(),
1471 env.info.varArgs = steps.head.isVarargsRequired());
1472 methodResolutionCache.put(steps.head, sym);
1473 steps = steps.tail;
1474 }
1475 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1476 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1477 sym = access(methodResolutionCache.get(errPhase),
1478 pos, site, names.init, true, argtypes, typeargtypes);
1479 env.info.varArgs = errPhase.isVarargsRequired();
1480 }
1481 return sym;
1482 }
1484 /** Resolve constructor using diamond inference.
1485 * @param pos The position to use for error reporting.
1486 * @param env The environment current at the constructor invocation.
1487 * @param site The type of class for which a constructor is searched.
1488 * The scope of this class has been touched in attribution.
1489 * @param argtypes The types of the constructor invocation's value
1490 * arguments.
1491 * @param typeargtypes The types of the constructor invocation's type
1492 * arguments.
1493 */
1494 Symbol resolveDiamond(DiagnosticPosition pos,
1495 Env<AttrContext> env,
1496 Type site,
1497 List<Type> argtypes,
1498 List<Type> typeargtypes) {
1499 Symbol sym = startResolution();
1500 List<MethodResolutionPhase> steps = methodResolutionSteps;
1501 while (steps.nonEmpty() &&
1502 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1503 sym.kind >= ERRONEOUS) {
1504 currentStep = steps.head;
1505 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1506 steps.head.isBoxingRequired(),
1507 env.info.varArgs = steps.head.isVarargsRequired());
1508 methodResolutionCache.put(steps.head, sym);
1509 steps = steps.tail;
1510 }
1511 if (sym.kind >= AMBIGUOUS) {
1512 final JCDiagnostic details = sym.kind == WRONG_MTH ?
1513 ((InapplicableSymbolError)sym).explanation :
1514 null;
1515 Symbol errSym = new ResolveError(WRONG_MTH, "diamond error") {
1516 @Override
1517 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
1518 String key = details == null ?
1519 "cant.apply.diamond" :
1520 "cant.apply.diamond.1";
1521 return diags.create(dkind, log.currentSource(), pos, key, diags.fragment("diamond", site.tsym), details);
1522 }
1523 };
1524 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1525 sym = access(errSym, pos, site, names.init, true, argtypes, typeargtypes);
1526 env.info.varArgs = errPhase.isVarargsRequired();
1527 }
1528 return sym;
1529 }
1531 /** Resolve constructor.
1532 * @param pos The position to use for error reporting.
1533 * @param env The environment current at the constructor invocation.
1534 * @param site The type of class for which a constructor is searched.
1535 * @param argtypes The types of the constructor invocation's value
1536 * arguments.
1537 * @param typeargtypes The types of the constructor invocation's type
1538 * arguments.
1539 * @param allowBoxing Allow boxing and varargs conversions.
1540 * @param useVarargs Box trailing arguments into an array for varargs.
1541 */
1542 Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1543 Type site, List<Type> argtypes,
1544 List<Type> typeargtypes,
1545 boolean allowBoxing,
1546 boolean useVarargs) {
1547 Symbol sym = findMethod(env, site,
1548 names.init, argtypes,
1549 typeargtypes, allowBoxing,
1550 useVarargs, false);
1551 if ((sym.flags() & DEPRECATED) != 0 &&
1552 (env.info.scope.owner.flags() & DEPRECATED) == 0 &&
1553 env.info.scope.owner.outermostClass() != sym.outermostClass())
1554 chk.warnDeprecated(pos, sym);
1555 return sym;
1556 }
1558 /** Resolve a constructor, throw a fatal error if not found.
1559 * @param pos The position to use for error reporting.
1560 * @param env The environment current at the method invocation.
1561 * @param site The type to be constructed.
1562 * @param argtypes The types of the invocation's value arguments.
1563 * @param typeargtypes The types of the invocation's type arguments.
1564 */
1565 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1566 Type site,
1567 List<Type> argtypes,
1568 List<Type> typeargtypes) {
1569 Symbol sym = resolveConstructor(
1570 pos, env, site, argtypes, typeargtypes);
1571 if (sym.kind == MTH) return (MethodSymbol)sym;
1572 else throw new FatalError(
1573 diags.fragment("fatal.err.cant.locate.ctor", site));
1574 }
1576 /** Resolve operator.
1577 * @param pos The position to use for error reporting.
1578 * @param optag The tag of the operation tree.
1579 * @param env The environment current at the operation.
1580 * @param argtypes The types of the operands.
1581 */
1582 Symbol resolveOperator(DiagnosticPosition pos, int optag,
1583 Env<AttrContext> env, List<Type> argtypes) {
1584 Name name = treeinfo.operatorName(optag);
1585 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
1586 null, false, false, true);
1587 if (boxingEnabled && sym.kind >= WRONG_MTHS)
1588 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1589 null, true, false, true);
1590 return access(sym, pos, env.enclClass.sym.type, name,
1591 false, argtypes, null);
1592 }
1594 /** Resolve operator.
1595 * @param pos The position to use for error reporting.
1596 * @param optag The tag of the operation tree.
1597 * @param env The environment current at the operation.
1598 * @param arg The type of the operand.
1599 */
1600 Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) {
1601 return resolveOperator(pos, optag, env, List.of(arg));
1602 }
1604 /** Resolve binary operator.
1605 * @param pos The position to use for error reporting.
1606 * @param optag The tag of the operation tree.
1607 * @param env The environment current at the operation.
1608 * @param left The types of the left operand.
1609 * @param right The types of the right operand.
1610 */
1611 Symbol resolveBinaryOperator(DiagnosticPosition pos,
1612 int optag,
1613 Env<AttrContext> env,
1614 Type left,
1615 Type right) {
1616 return resolveOperator(pos, optag, env, List.of(left, right));
1617 }
1619 /**
1620 * Resolve `c.name' where name == this or name == super.
1621 * @param pos The position to use for error reporting.
1622 * @param env The environment current at the expression.
1623 * @param c The qualifier.
1624 * @param name The identifier's name.
1625 */
1626 Symbol resolveSelf(DiagnosticPosition pos,
1627 Env<AttrContext> env,
1628 TypeSymbol c,
1629 Name name) {
1630 Env<AttrContext> env1 = env;
1631 boolean staticOnly = false;
1632 while (env1.outer != null) {
1633 if (isStatic(env1)) staticOnly = true;
1634 if (env1.enclClass.sym == c) {
1635 Symbol sym = env1.info.scope.lookup(name).sym;
1636 if (sym != null) {
1637 if (staticOnly) sym = new StaticError(sym);
1638 return access(sym, pos, env.enclClass.sym.type,
1639 name, true);
1640 }
1641 }
1642 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1643 env1 = env1.outer;
1644 }
1645 log.error(pos, "not.encl.class", c);
1646 return syms.errSymbol;
1647 }
1649 /**
1650 * Resolve `c.this' for an enclosing class c that contains the
1651 * named member.
1652 * @param pos The position to use for error reporting.
1653 * @param env The environment current at the expression.
1654 * @param member The member that must be contained in the result.
1655 */
1656 Symbol resolveSelfContaining(DiagnosticPosition pos,
1657 Env<AttrContext> env,
1658 Symbol member) {
1659 Name name = names._this;
1660 Env<AttrContext> env1 = env;
1661 boolean staticOnly = false;
1662 while (env1.outer != null) {
1663 if (isStatic(env1)) staticOnly = true;
1664 if (env1.enclClass.sym.isSubClass(member.owner, types) &&
1665 isAccessible(env, env1.enclClass.sym.type, member)) {
1666 Symbol sym = env1.info.scope.lookup(name).sym;
1667 if (sym != null) {
1668 if (staticOnly) sym = new StaticError(sym);
1669 return access(sym, pos, env.enclClass.sym.type,
1670 name, true);
1671 }
1672 }
1673 if ((env1.enclClass.sym.flags() & STATIC) != 0)
1674 staticOnly = true;
1675 env1 = env1.outer;
1676 }
1677 log.error(pos, "encl.class.required", member);
1678 return syms.errSymbol;
1679 }
1681 /**
1682 * Resolve an appropriate implicit this instance for t's container.
1683 * JLS2 8.8.5.1 and 15.9.2
1684 */
1685 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
1686 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
1687 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
1688 : resolveSelfContaining(pos, env, t.tsym)).type;
1689 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
1690 log.error(pos, "cant.ref.before.ctor.called", "this");
1691 return thisType;
1692 }
1694 /* ***************************************************************************
1695 * ResolveError classes, indicating error situations when accessing symbols
1696 ****************************************************************************/
1698 public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
1699 AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
1700 logResolveError(error, tree.pos(), type.getEnclosingType(), null, null, null);
1701 }
1702 //where
1703 private void logResolveError(ResolveError error,
1704 DiagnosticPosition pos,
1705 Type site,
1706 Name name,
1707 List<Type> argtypes,
1708 List<Type> typeargtypes) {
1709 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
1710 pos, site, name, argtypes, typeargtypes);
1711 if (d != null) {
1712 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
1713 log.report(d);
1714 }
1715 }
1717 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
1719 public Object methodArguments(List<Type> argtypes) {
1720 return argtypes.isEmpty() ? noArgs : argtypes;
1721 }
1723 /**
1724 * Root class for resolution errors. Subclass of ResolveError
1725 * represent a different kinds of resolution error - as such they must
1726 * specify how they map into concrete compiler diagnostics.
1727 */
1728 private abstract class ResolveError extends Symbol {
1730 /** The name of the kind of error, for debugging only. */
1731 final String debugName;
1733 ResolveError(int kind, String debugName) {
1734 super(kind, 0, null, null, null);
1735 this.debugName = debugName;
1736 }
1738 @Override
1739 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1740 throw new AssertionError();
1741 }
1743 @Override
1744 public String toString() {
1745 return debugName;
1746 }
1748 @Override
1749 public boolean exists() {
1750 return false;
1751 }
1753 /**
1754 * Create an external representation for this erroneous symbol to be
1755 * used during attribution - by default this returns the symbol of a
1756 * brand new error type which stores the original type found
1757 * during resolution.
1758 *
1759 * @param name the name used during resolution
1760 * @param location the location from which the symbol is accessed
1761 */
1762 protected Symbol access(Name name, TypeSymbol location) {
1763 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1764 }
1766 /**
1767 * Create a diagnostic representing this resolution error.
1768 *
1769 * @param dkind The kind of the diagnostic to be created (e.g error).
1770 * @param pos The position to be used for error reporting.
1771 * @param site The original type from where the selection took place.
1772 * @param name The name of the symbol to be resolved.
1773 * @param argtypes The invocation's value arguments,
1774 * if we looked for a method.
1775 * @param typeargtypes The invocation's type arguments,
1776 * if we looked for a method.
1777 */
1778 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1779 DiagnosticPosition pos,
1780 Type site,
1781 Name name,
1782 List<Type> argtypes,
1783 List<Type> typeargtypes);
1785 /**
1786 * A name designates an operator if it consists
1787 * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
1788 */
1789 boolean isOperator(Name name) {
1790 int i = 0;
1791 while (i < name.getByteLength() &&
1792 "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
1793 return i > 0 && i == name.getByteLength();
1794 }
1795 }
1797 /**
1798 * This class is the root class of all resolution errors caused by
1799 * an invalid symbol being found during resolution.
1800 */
1801 abstract class InvalidSymbolError extends ResolveError {
1803 /** The invalid symbol found during resolution */
1804 Symbol sym;
1806 InvalidSymbolError(int kind, Symbol sym, String debugName) {
1807 super(kind, debugName);
1808 this.sym = sym;
1809 }
1811 @Override
1812 public boolean exists() {
1813 return true;
1814 }
1816 @Override
1817 public String toString() {
1818 return super.toString() + " wrongSym=" + sym;
1819 }
1821 @Override
1822 public Symbol access(Name name, TypeSymbol location) {
1823 if (sym.kind >= AMBIGUOUS)
1824 return ((ResolveError)sym).access(name, location);
1825 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
1826 return types.createErrorType(name, location, sym.type).tsym;
1827 else
1828 return sym;
1829 }
1830 }
1832 /**
1833 * InvalidSymbolError error class indicating that a symbol matching a
1834 * given name does not exists in a given site.
1835 */
1836 class SymbolNotFoundError extends ResolveError {
1838 SymbolNotFoundError(int kind) {
1839 super(kind, "symbol not found error");
1840 }
1842 @Override
1843 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1844 DiagnosticPosition pos,
1845 Type site,
1846 Name name,
1847 List<Type> argtypes,
1848 List<Type> typeargtypes) {
1849 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
1850 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
1851 if (name == names.error)
1852 return null;
1854 if (isOperator(name)) {
1855 return diags.create(dkind, log.currentSource(), pos,
1856 "operator.cant.be.applied", name, argtypes);
1857 }
1858 boolean hasLocation = false;
1859 if (!site.tsym.name.isEmpty()) {
1860 if (site.tsym.kind == PCK && !site.tsym.exists()) {
1861 return diags.create(dkind, log.currentSource(), pos,
1862 "doesnt.exist", site.tsym);
1863 }
1864 hasLocation = true;
1865 }
1866 boolean isConstructor = kind == ABSENT_MTH &&
1867 name == names.table.names.init;
1868 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
1869 Name idname = isConstructor ? site.tsym.name : name;
1870 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
1871 if (hasLocation) {
1872 return diags.create(dkind, log.currentSource(), pos,
1873 errKey, kindname, idname, //symbol kindname, name
1874 typeargtypes, argtypes, //type parameters and arguments (if any)
1875 typeKindName(site), site); //location kindname, type
1876 }
1877 else {
1878 return diags.create(dkind, log.currentSource(), pos,
1879 errKey, kindname, idname, //symbol kindname, name
1880 typeargtypes, argtypes); //type parameters and arguments (if any)
1881 }
1882 }
1883 //where
1884 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
1885 String key = "cant.resolve";
1886 String suffix = hasLocation ? ".location" : "";
1887 switch (kindname) {
1888 case METHOD:
1889 case CONSTRUCTOR: {
1890 suffix += ".args";
1891 suffix += hasTypeArgs ? ".params" : "";
1892 }
1893 }
1894 return key + suffix;
1895 }
1896 }
1898 /**
1899 * InvalidSymbolError error class indicating that a given symbol
1900 * (either a method, a constructor or an operand) is not applicable
1901 * given an actual arguments/type argument list.
1902 */
1903 class InapplicableSymbolError extends InvalidSymbolError {
1905 /** An auxiliary explanation set in case of instantiation errors. */
1906 JCDiagnostic explanation;
1908 InapplicableSymbolError(Symbol sym) {
1909 super(WRONG_MTH, sym, "inapplicable symbol error");
1910 }
1912 /** Update sym and explanation and return this.
1913 */
1914 InapplicableSymbolError setWrongSym(Symbol sym, JCDiagnostic explanation) {
1915 this.sym = sym;
1916 if (this.sym == sym && explanation != null)
1917 this.explanation = explanation; //update the details
1918 return this;
1919 }
1921 /** Update sym and return this.
1922 */
1923 InapplicableSymbolError setWrongSym(Symbol sym) {
1924 this.sym = sym;
1925 return this;
1926 }
1928 @Override
1929 public String toString() {
1930 return super.toString() + " explanation=" + explanation;
1931 }
1933 @Override
1934 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1935 DiagnosticPosition pos,
1936 Type site,
1937 Name name,
1938 List<Type> argtypes,
1939 List<Type> typeargtypes) {
1940 if (name == names.error)
1941 return null;
1943 if (isOperator(name)) {
1944 return diags.create(dkind, log.currentSource(),
1945 pos, "operator.cant.be.applied", name, argtypes);
1946 }
1947 else {
1948 Symbol ws = sym.asMemberOf(site, types);
1949 return diags.create(dkind, log.currentSource(), pos,
1950 "cant.apply.symbol" + (explanation != null ? ".1" : ""),
1951 kindName(ws),
1952 ws.name == names.init ? ws.owner.name : ws.name,
1953 methodArguments(ws.type.getParameterTypes()),
1954 methodArguments(argtypes),
1955 kindName(ws.owner),
1956 ws.owner.type,
1957 explanation);
1958 }
1959 }
1961 void clear() {
1962 explanation = null;
1963 }
1965 @Override
1966 public Symbol access(Name name, TypeSymbol location) {
1967 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1968 }
1969 }
1971 /**
1972 * ResolveError error class indicating that a set of symbols
1973 * (either methods, constructors or operands) is not applicable
1974 * given an actual arguments/type argument list.
1975 */
1976 class InapplicableSymbolsError extends ResolveError {
1978 private List<Candidate> candidates = List.nil();
1980 InapplicableSymbolsError(Symbol sym) {
1981 super(WRONG_MTHS, "inapplicable symbols");
1982 }
1984 @Override
1985 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1986 DiagnosticPosition pos,
1987 Type site,
1988 Name name,
1989 List<Type> argtypes,
1990 List<Type> typeargtypes) {
1991 if (candidates.nonEmpty()) {
1992 JCDiagnostic err = diags.create(dkind,
1993 log.currentSource(),
1994 pos,
1995 "cant.apply.symbols",
1996 name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
1997 getName(),
1998 argtypes);
1999 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(site));
2000 } else {
2001 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
2002 site, name, argtypes, typeargtypes);
2003 }
2004 }
2006 //where
2007 List<JCDiagnostic> candidateDetails(Type site) {
2008 List<JCDiagnostic> details = List.nil();
2009 for (Candidate c : candidates)
2010 details = details.prepend(c.getDiagnostic(site));
2011 return details.reverse();
2012 }
2014 Symbol addCandidate(MethodResolutionPhase currentStep, Symbol sym, JCDiagnostic details) {
2015 Candidate c = new Candidate(currentStep, sym, details);
2016 if (c.isValid() && !candidates.contains(c))
2017 candidates = candidates.append(c);
2018 return this;
2019 }
2021 void clear() {
2022 candidates = List.nil();
2023 }
2025 private Name getName() {
2026 Symbol sym = candidates.head.sym;
2027 return sym.name == names.init ?
2028 sym.owner.name :
2029 sym.name;
2030 }
2032 private class Candidate {
2034 final MethodResolutionPhase step;
2035 final Symbol sym;
2036 final JCDiagnostic details;
2038 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details) {
2039 this.step = step;
2040 this.sym = sym;
2041 this.details = details;
2042 }
2044 JCDiagnostic getDiagnostic(Type site) {
2045 return diags.fragment("inapplicable.method",
2046 Kinds.kindName(sym),
2047 sym.location(site, types),
2048 sym.asMemberOf(site, types),
2049 details);
2050 }
2052 @Override
2053 public boolean equals(Object o) {
2054 if (o instanceof Candidate) {
2055 Symbol s1 = this.sym;
2056 Symbol s2 = ((Candidate)o).sym;
2057 if ((s1 != s2 &&
2058 (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
2059 (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
2060 ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
2061 return true;
2062 }
2063 return false;
2064 }
2066 boolean isValid() {
2067 return (((sym.flags() & VARARGS) != 0 && step == VARARITY) ||
2068 (sym.flags() & VARARGS) == 0 && step == (boxingEnabled ? BOX : BASIC));
2069 }
2070 }
2071 }
2073 /**
2074 * An InvalidSymbolError error class indicating that a symbol is not
2075 * accessible from a given site
2076 */
2077 class AccessError extends InvalidSymbolError {
2079 private Env<AttrContext> env;
2080 private Type site;
2082 AccessError(Symbol sym) {
2083 this(null, null, sym);
2084 }
2086 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
2087 super(HIDDEN, sym, "access error");
2088 this.env = env;
2089 this.site = site;
2090 if (debugResolve)
2091 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
2092 }
2094 @Override
2095 public boolean exists() {
2096 return false;
2097 }
2099 @Override
2100 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2101 DiagnosticPosition pos,
2102 Type site,
2103 Name name,
2104 List<Type> argtypes,
2105 List<Type> typeargtypes) {
2106 if (sym.owner.type.tag == ERROR)
2107 return null;
2109 if (sym.name == names.init && sym.owner != site.tsym) {
2110 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
2111 pos, site, name, argtypes, typeargtypes);
2112 }
2113 else if ((sym.flags() & PUBLIC) != 0
2114 || (env != null && this.site != null
2115 && !isAccessible(env, this.site))) {
2116 return diags.create(dkind, log.currentSource(),
2117 pos, "not.def.access.class.intf.cant.access",
2118 sym, sym.location());
2119 }
2120 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
2121 return diags.create(dkind, log.currentSource(),
2122 pos, "report.access", sym,
2123 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
2124 sym.location());
2125 }
2126 else {
2127 return diags.create(dkind, log.currentSource(),
2128 pos, "not.def.public.cant.access", sym, sym.location());
2129 }
2130 }
2131 }
2133 /**
2134 * InvalidSymbolError error class indicating that an instance member
2135 * has erroneously been accessed from a static context.
2136 */
2137 class StaticError extends InvalidSymbolError {
2139 StaticError(Symbol sym) {
2140 super(STATICERR, sym, "static error");
2141 }
2143 @Override
2144 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2145 DiagnosticPosition pos,
2146 Type site,
2147 Name name,
2148 List<Type> argtypes,
2149 List<Type> typeargtypes) {
2150 Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
2151 ? types.erasure(sym.type).tsym
2152 : sym);
2153 return diags.create(dkind, log.currentSource(), pos,
2154 "non-static.cant.be.ref", kindName(sym), errSym);
2155 }
2156 }
2158 /**
2159 * InvalidSymbolError error class indicating that a pair of symbols
2160 * (either methods, constructors or operands) are ambiguous
2161 * given an actual arguments/type argument list.
2162 */
2163 class AmbiguityError extends InvalidSymbolError {
2165 /** The other maximally specific symbol */
2166 Symbol sym2;
2168 AmbiguityError(Symbol sym1, Symbol sym2) {
2169 super(AMBIGUOUS, sym1, "ambiguity error");
2170 this.sym2 = sym2;
2171 }
2173 @Override
2174 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2175 DiagnosticPosition pos,
2176 Type site,
2177 Name name,
2178 List<Type> argtypes,
2179 List<Type> typeargtypes) {
2180 AmbiguityError pair = this;
2181 while (true) {
2182 if (pair.sym.kind == AMBIGUOUS)
2183 pair = (AmbiguityError)pair.sym;
2184 else if (pair.sym2.kind == AMBIGUOUS)
2185 pair = (AmbiguityError)pair.sym2;
2186 else break;
2187 }
2188 Name sname = pair.sym.name;
2189 if (sname == names.init) sname = pair.sym.owner.name;
2190 return diags.create(dkind, log.currentSource(),
2191 pos, "ref.ambiguous", sname,
2192 kindName(pair.sym),
2193 pair.sym,
2194 pair.sym.location(site, types),
2195 kindName(pair.sym2),
2196 pair.sym2,
2197 pair.sym2.location(site, types));
2198 }
2199 }
2201 enum MethodResolutionPhase {
2202 BASIC(false, false),
2203 BOX(true, false),
2204 VARARITY(true, true);
2206 boolean isBoxingRequired;
2207 boolean isVarargsRequired;
2209 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
2210 this.isBoxingRequired = isBoxingRequired;
2211 this.isVarargsRequired = isVarargsRequired;
2212 }
2214 public boolean isBoxingRequired() {
2215 return isBoxingRequired;
2216 }
2218 public boolean isVarargsRequired() {
2219 return isVarargsRequired;
2220 }
2222 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
2223 return (varargsEnabled || !isVarargsRequired) &&
2224 (boxingEnabled || !isBoxingRequired);
2225 }
2226 }
2228 private Map<MethodResolutionPhase, Symbol> methodResolutionCache =
2229 new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length);
2231 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
2233 private MethodResolutionPhase currentStep = null;
2235 private MethodResolutionPhase firstErroneousResolutionPhase() {
2236 MethodResolutionPhase bestSoFar = BASIC;
2237 Symbol sym = methodNotFound;
2238 List<MethodResolutionPhase> steps = methodResolutionSteps;
2239 while (steps.nonEmpty() &&
2240 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
2241 sym.kind >= WRONG_MTHS) {
2242 sym = methodResolutionCache.get(steps.head);
2243 bestSoFar = steps.head;
2244 steps = steps.tail;
2245 }
2246 return bestSoFar;
2247 }
2248 }
