Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/comp/Resolve.java@366c233eb838
src/share/classes/com/sun/tools/javac/comp/Resolve.java
Wed, 19 Oct 2011 16:56:05 +0100
- author
- mcimadamore
- date
- Wed, 19 Oct 2011 16:56:05 +0100
- changeset 1110
- 366c233eb838
- parent 1059
- 0b5beb9562c6
- child 1114
- 05814303a056
- permissions
- -rw-r--r--
7102515: javac running very very long and not returning
Summary: Verbose resolution diagnostics slow down with operator resolution
Reviewed-by: jjg
1 /*
2 * Copyright (c) 1999, 2011, 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.Set;
49 import java.util.HashMap;
50 import java.util.HashSet;
52 /** Helper class for name resolution, used mostly by the attribution phase.
53 *
54 * <p><b>This is NOT part of any supported API.
55 * If you write code that depends on this, you do so at your own risk.
56 * This code and its internal interfaces are subject to change or
57 * deletion without notice.</b>
58 */
59 public class Resolve {
60 protected static final Context.Key<Resolve> resolveKey =
61 new Context.Key<Resolve>();
63 Names names;
64 Log log;
65 Symtab syms;
66 Check chk;
67 Infer infer;
68 ClassReader reader;
69 TreeInfo treeinfo;
70 Types types;
71 JCDiagnostic.Factory diags;
72 public final boolean boxingEnabled; // = source.allowBoxing();
73 public final boolean varargsEnabled; // = source.allowVarargs();
74 public final boolean allowMethodHandles;
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.isSet("debugresolve");
114 Target target = Target.instance(context);
115 allowMethodHandles = target.hasMethodHandles();
116 polymorphicSignatureScope = new Scope(syms.noSymbol);
118 inapplicableMethodException = new InapplicableMethodException(diags);
119 }
121 /** error symbols, which are returned when resolution fails
122 */
123 final SymbolNotFoundError varNotFound;
124 final InapplicableSymbolError wrongMethod;
125 final InapplicableSymbolsError wrongMethods;
126 final SymbolNotFoundError methodNotFound;
127 final SymbolNotFoundError typeNotFound;
129 /* ************************************************************************
130 * Identifier resolution
131 *************************************************************************/
133 /** An environment is "static" if its static level is greater than
134 * the one of its outer environment
135 */
136 static boolean isStatic(Env<AttrContext> env) {
137 return env.info.staticLevel > env.outer.info.staticLevel;
138 }
140 /** An environment is an "initializer" if it is a constructor or
141 * an instance initializer.
142 */
143 static boolean isInitializer(Env<AttrContext> env) {
144 Symbol owner = env.info.scope.owner;
145 return owner.isConstructor() ||
146 owner.owner.kind == TYP &&
147 (owner.kind == VAR ||
148 owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
149 (owner.flags() & STATIC) == 0;
150 }
152 /** Is class accessible in given evironment?
153 * @param env The current environment.
154 * @param c The class whose accessibility is checked.
155 */
156 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
157 return isAccessible(env, c, false);
158 }
160 public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
161 boolean isAccessible = false;
162 switch ((short)(c.flags() & AccessFlags)) {
163 case PRIVATE:
164 isAccessible =
165 env.enclClass.sym.outermostClass() ==
166 c.owner.outermostClass();
167 break;
168 case 0:
169 isAccessible =
170 env.toplevel.packge == c.owner // fast special case
171 ||
172 env.toplevel.packge == c.packge()
173 ||
174 // Hack: this case is added since synthesized default constructors
175 // of anonymous classes should be allowed to access
176 // classes which would be inaccessible otherwise.
177 env.enclMethod != null &&
178 (env.enclMethod.mods.flags & ANONCONSTR) != 0;
179 break;
180 default: // error recovery
181 case PUBLIC:
182 isAccessible = true;
183 break;
184 case PROTECTED:
185 isAccessible =
186 env.toplevel.packge == c.owner // fast special case
187 ||
188 env.toplevel.packge == c.packge()
189 ||
190 isInnerSubClass(env.enclClass.sym, c.owner);
191 break;
192 }
193 return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
194 isAccessible :
195 isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
196 }
197 //where
198 /** Is given class a subclass of given base class, or an inner class
199 * of a subclass?
200 * Return null if no such class exists.
201 * @param c The class which is the subclass or is contained in it.
202 * @param base The base class
203 */
204 private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
205 while (c != null && !c.isSubClass(base, types)) {
206 c = c.owner.enclClass();
207 }
208 return c != null;
209 }
211 boolean isAccessible(Env<AttrContext> env, Type t) {
212 return isAccessible(env, t, false);
213 }
215 boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
216 return (t.tag == ARRAY)
217 ? isAccessible(env, types.elemtype(t))
218 : isAccessible(env, t.tsym, checkInner);
219 }
221 /** Is symbol accessible as a member of given type in given evironment?
222 * @param env The current environment.
223 * @param site The type of which the tested symbol is regarded
224 * as a member.
225 * @param sym The symbol.
226 */
227 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
228 return isAccessible(env, site, sym, false);
229 }
230 public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
231 if (sym.name == names.init && sym.owner != site.tsym) return false;
232 switch ((short)(sym.flags() & AccessFlags)) {
233 case PRIVATE:
234 return
235 (env.enclClass.sym == sym.owner // fast special case
236 ||
237 env.enclClass.sym.outermostClass() ==
238 sym.owner.outermostClass())
239 &&
240 sym.isInheritedIn(site.tsym, types);
241 case 0:
242 return
243 (env.toplevel.packge == sym.owner.owner // fast special case
244 ||
245 env.toplevel.packge == sym.packge())
246 &&
247 isAccessible(env, site, checkInner)
248 &&
249 sym.isInheritedIn(site.tsym, types)
250 &&
251 notOverriddenIn(site, sym);
252 case PROTECTED:
253 return
254 (env.toplevel.packge == sym.owner.owner // fast special case
255 ||
256 env.toplevel.packge == sym.packge()
257 ||
258 isProtectedAccessible(sym, env.enclClass.sym, site)
259 ||
260 // OK to select instance method or field from 'super' or type name
261 // (but type names should be disallowed elsewhere!)
262 env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
263 &&
264 isAccessible(env, site, checkInner)
265 &&
266 notOverriddenIn(site, sym);
267 default: // this case includes erroneous combinations as well
268 return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
269 }
270 }
271 //where
272 /* `sym' is accessible only if not overridden by
273 * another symbol which is a member of `site'
274 * (because, if it is overridden, `sym' is not strictly
275 * speaking a member of `site'). A polymorphic signature method
276 * cannot be overridden (e.g. MH.invokeExact(Object[])).
277 */
278 private boolean notOverriddenIn(Type site, Symbol sym) {
279 if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
280 return true;
281 else {
282 Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
283 return (s2 == null || s2 == sym || sym.owner == s2.owner ||
284 s2.isPolymorphicSignatureGeneric() ||
285 !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
286 }
287 }
288 //where
289 /** Is given protected symbol accessible if it is selected from given site
290 * and the selection takes place in given class?
291 * @param sym The symbol with protected access
292 * @param c The class where the access takes place
293 * @site The type of the qualifier
294 */
295 private
296 boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
297 while (c != null &&
298 !(c.isSubClass(sym.owner, types) &&
299 (c.flags() & INTERFACE) == 0 &&
300 // In JLS 2e 6.6.2.1, the subclass restriction applies
301 // only to instance fields and methods -- types are excluded
302 // regardless of whether they are declared 'static' or not.
303 ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
304 c = c.owner.enclClass();
305 return c != null;
306 }
308 /** Try to instantiate the type of a method so that it fits
309 * given type arguments and argument types. If succesful, return
310 * the method's instantiated type, else return null.
311 * The instantiation will take into account an additional leading
312 * formal parameter if the method is an instance method seen as a member
313 * of un underdetermined site In this case, we treat site as an additional
314 * parameter and the parameters of the class containing the method as
315 * additional type variables that get instantiated.
316 *
317 * @param env The current environment
318 * @param site The type of which the method is a member.
319 * @param m The method symbol.
320 * @param argtypes The invocation's given value arguments.
321 * @param typeargtypes The invocation's given type arguments.
322 * @param allowBoxing Allow boxing conversions of arguments.
323 * @param useVarargs Box trailing arguments into an array for varargs.
324 */
325 Type rawInstantiate(Env<AttrContext> env,
326 Type site,
327 Symbol m,
328 List<Type> argtypes,
329 List<Type> typeargtypes,
330 boolean allowBoxing,
331 boolean useVarargs,
332 Warner warn)
333 throws Infer.InferenceException {
334 boolean polymorphicSignature = m.isPolymorphicSignatureGeneric() && allowMethodHandles;
335 if (useVarargs && (m.flags() & VARARGS) == 0)
336 throw inapplicableMethodException.setMessage();
337 Type mt = types.memberType(site, m);
339 // tvars is the list of formal type variables for which type arguments
340 // need to inferred.
341 List<Type> tvars = null;
342 if (env.info.tvars != null) {
343 tvars = types.newInstances(env.info.tvars);
344 mt = types.subst(mt, env.info.tvars, tvars);
345 }
346 if (typeargtypes == null) typeargtypes = List.nil();
347 if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
348 // This is not a polymorphic method, but typeargs are supplied
349 // which is fine, see JLS 15.12.2.1
350 } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
351 ForAll pmt = (ForAll) mt;
352 if (typeargtypes.length() != pmt.tvars.length())
353 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
354 // Check type arguments are within bounds
355 List<Type> formals = pmt.tvars;
356 List<Type> actuals = typeargtypes;
357 while (formals.nonEmpty() && actuals.nonEmpty()) {
358 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
359 pmt.tvars, typeargtypes);
360 for (; bounds.nonEmpty(); bounds = bounds.tail)
361 if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
362 throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
363 formals = formals.tail;
364 actuals = actuals.tail;
365 }
366 mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
367 } else if (mt.tag == FORALL) {
368 ForAll pmt = (ForAll) mt;
369 List<Type> tvars1 = types.newInstances(pmt.tvars);
370 tvars = tvars.appendList(tvars1);
371 mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
372 }
374 // find out whether we need to go the slow route via infer
375 boolean instNeeded = tvars.tail != null || /*inlined: tvars.nonEmpty()*/
376 polymorphicSignature;
377 for (List<Type> l = argtypes;
378 l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
379 l = l.tail) {
380 if (l.head.tag == FORALL) instNeeded = true;
381 }
383 if (instNeeded)
384 return polymorphicSignature ?
385 infer.instantiatePolymorphicSignatureInstance(env, site, m.name, (MethodSymbol)m, argtypes) :
386 infer.instantiateMethod(env,
387 tvars,
388 (MethodType)mt,
389 m,
390 argtypes,
391 allowBoxing,
392 useVarargs,
393 warn);
395 checkRawArgumentsAcceptable(env, argtypes, mt.getParameterTypes(),
396 allowBoxing, useVarargs, warn);
397 return mt;
398 }
400 /** Same but returns null instead throwing a NoInstanceException
401 */
402 Type instantiate(Env<AttrContext> env,
403 Type site,
404 Symbol m,
405 List<Type> argtypes,
406 List<Type> typeargtypes,
407 boolean allowBoxing,
408 boolean useVarargs,
409 Warner warn) {
410 try {
411 return rawInstantiate(env, site, m, argtypes, typeargtypes,
412 allowBoxing, useVarargs, warn);
413 } catch (InapplicableMethodException ex) {
414 return null;
415 }
416 }
418 /** Check if a parameter list accepts a list of args.
419 */
420 boolean argumentsAcceptable(Env<AttrContext> env,
421 List<Type> argtypes,
422 List<Type> formals,
423 boolean allowBoxing,
424 boolean useVarargs,
425 Warner warn) {
426 try {
427 checkRawArgumentsAcceptable(env, argtypes, formals, allowBoxing, useVarargs, warn);
428 return true;
429 } catch (InapplicableMethodException ex) {
430 return false;
431 }
432 }
433 void checkRawArgumentsAcceptable(Env<AttrContext> env,
434 List<Type> argtypes,
435 List<Type> formals,
436 boolean allowBoxing,
437 boolean useVarargs,
438 Warner warn) {
439 Type varargsFormal = useVarargs ? formals.last() : null;
440 if (varargsFormal == null &&
441 argtypes.size() != formals.size()) {
442 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
443 }
445 while (argtypes.nonEmpty() && formals.head != varargsFormal) {
446 boolean works = allowBoxing
447 ? types.isConvertible(argtypes.head, formals.head, warn)
448 : types.isSubtypeUnchecked(argtypes.head, formals.head, warn);
449 if (!works)
450 throw inapplicableMethodException.setMessage("no.conforming.assignment.exists",
451 argtypes.head,
452 formals.head);
453 argtypes = argtypes.tail;
454 formals = formals.tail;
455 }
457 if (formals.head != varargsFormal)
458 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
460 if (useVarargs) {
461 Type elt = types.elemtype(varargsFormal);
462 while (argtypes.nonEmpty()) {
463 if (!types.isConvertible(argtypes.head, elt, warn))
464 throw inapplicableMethodException.setMessage("varargs.argument.mismatch",
465 argtypes.head,
466 elt);
467 argtypes = argtypes.tail;
468 }
469 //check varargs element type accessibility
470 if (!isAccessible(env, elt)) {
471 Symbol location = env.enclClass.sym;
472 throw inapplicableMethodException.setMessage("inaccessible.varargs.type",
473 elt,
474 Kinds.kindName(location),
475 location);
476 }
477 }
478 return;
479 }
480 // where
481 public static class InapplicableMethodException extends RuntimeException {
482 private static final long serialVersionUID = 0;
484 JCDiagnostic diagnostic;
485 JCDiagnostic.Factory diags;
487 InapplicableMethodException(JCDiagnostic.Factory diags) {
488 this.diagnostic = null;
489 this.diags = diags;
490 }
491 InapplicableMethodException setMessage() {
492 this.diagnostic = null;
493 return this;
494 }
495 InapplicableMethodException setMessage(String key) {
496 this.diagnostic = key != null ? diags.fragment(key) : null;
497 return this;
498 }
499 InapplicableMethodException setMessage(String key, Object... args) {
500 this.diagnostic = key != null ? diags.fragment(key, args) : null;
501 return this;
502 }
503 InapplicableMethodException setMessage(JCDiagnostic diag) {
504 this.diagnostic = diag;
505 return this;
506 }
508 public JCDiagnostic getDiagnostic() {
509 return diagnostic;
510 }
511 }
512 private final InapplicableMethodException inapplicableMethodException;
514 /* ***************************************************************************
515 * Symbol lookup
516 * the following naming conventions for arguments are used
517 *
518 * env is the environment where the symbol was mentioned
519 * site is the type of which the symbol is a member
520 * name is the symbol's name
521 * if no arguments are given
522 * argtypes are the value arguments, if we search for a method
523 *
524 * If no symbol was found, a ResolveError detailing the problem is returned.
525 ****************************************************************************/
527 /** Find field. Synthetic fields are always skipped.
528 * @param env The current environment.
529 * @param site The original type from where the selection takes place.
530 * @param name The name of the field.
531 * @param c The class to search for the field. This is always
532 * a superclass or implemented interface of site's class.
533 */
534 Symbol findField(Env<AttrContext> env,
535 Type site,
536 Name name,
537 TypeSymbol c) {
538 while (c.type.tag == TYPEVAR)
539 c = c.type.getUpperBound().tsym;
540 Symbol bestSoFar = varNotFound;
541 Symbol sym;
542 Scope.Entry e = c.members().lookup(name);
543 while (e.scope != null) {
544 if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
545 return isAccessible(env, site, e.sym)
546 ? e.sym : new AccessError(env, site, e.sym);
547 }
548 e = e.next();
549 }
550 Type st = types.supertype(c.type);
551 if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
552 sym = findField(env, site, name, st.tsym);
553 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
554 }
555 for (List<Type> l = types.interfaces(c.type);
556 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
557 l = l.tail) {
558 sym = findField(env, site, name, l.head.tsym);
559 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
560 sym.owner != bestSoFar.owner)
561 bestSoFar = new AmbiguityError(bestSoFar, sym);
562 else if (sym.kind < bestSoFar.kind)
563 bestSoFar = sym;
564 }
565 return bestSoFar;
566 }
568 /** Resolve a field identifier, throw a fatal error if not found.
569 * @param pos The position to use for error reporting.
570 * @param env The environment current at the method invocation.
571 * @param site The type of the qualifying expression, in which
572 * identifier is searched.
573 * @param name The identifier's name.
574 */
575 public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
576 Type site, Name name) {
577 Symbol sym = findField(env, site, name, site.tsym);
578 if (sym.kind == VAR) return (VarSymbol)sym;
579 else throw new FatalError(
580 diags.fragment("fatal.err.cant.locate.field",
581 name));
582 }
584 /** Find unqualified variable or field with given name.
585 * Synthetic fields always skipped.
586 * @param env The current environment.
587 * @param name The name of the variable or field.
588 */
589 Symbol findVar(Env<AttrContext> env, Name name) {
590 Symbol bestSoFar = varNotFound;
591 Symbol sym;
592 Env<AttrContext> env1 = env;
593 boolean staticOnly = false;
594 while (env1.outer != null) {
595 if (isStatic(env1)) staticOnly = true;
596 Scope.Entry e = env1.info.scope.lookup(name);
597 while (e.scope != null &&
598 (e.sym.kind != VAR ||
599 (e.sym.flags_field & SYNTHETIC) != 0))
600 e = e.next();
601 sym = (e.scope != null)
602 ? e.sym
603 : findField(
604 env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
605 if (sym.exists()) {
606 if (staticOnly &&
607 sym.kind == VAR &&
608 sym.owner.kind == TYP &&
609 (sym.flags() & STATIC) == 0)
610 return new StaticError(sym);
611 else
612 return sym;
613 } else if (sym.kind < bestSoFar.kind) {
614 bestSoFar = sym;
615 }
617 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
618 env1 = env1.outer;
619 }
621 sym = findField(env, syms.predefClass.type, name, syms.predefClass);
622 if (sym.exists())
623 return sym;
624 if (bestSoFar.exists())
625 return bestSoFar;
627 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
628 for (; e.scope != null; e = e.next()) {
629 sym = e.sym;
630 Type origin = e.getOrigin().owner.type;
631 if (sym.kind == VAR) {
632 if (e.sym.owner.type != origin)
633 sym = sym.clone(e.getOrigin().owner);
634 return isAccessible(env, origin, sym)
635 ? sym : new AccessError(env, origin, sym);
636 }
637 }
639 Symbol origin = null;
640 e = env.toplevel.starImportScope.lookup(name);
641 for (; e.scope != null; e = e.next()) {
642 sym = e.sym;
643 if (sym.kind != VAR)
644 continue;
645 // invariant: sym.kind == VAR
646 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
647 return new AmbiguityError(bestSoFar, sym);
648 else if (bestSoFar.kind >= VAR) {
649 origin = e.getOrigin().owner;
650 bestSoFar = isAccessible(env, origin.type, sym)
651 ? sym : new AccessError(env, origin.type, sym);
652 }
653 }
654 if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
655 return bestSoFar.clone(origin);
656 else
657 return bestSoFar;
658 }
660 Warner noteWarner = new Warner();
662 /** Select the best method for a call site among two choices.
663 * @param env The current environment.
664 * @param site The original type from where the
665 * selection takes place.
666 * @param argtypes The invocation's value arguments,
667 * @param typeargtypes The invocation's type arguments,
668 * @param sym Proposed new best match.
669 * @param bestSoFar Previously found best match.
670 * @param allowBoxing Allow boxing conversions of arguments.
671 * @param useVarargs Box trailing arguments into an array for varargs.
672 */
673 @SuppressWarnings("fallthrough")
674 Symbol selectBest(Env<AttrContext> env,
675 Type site,
676 List<Type> argtypes,
677 List<Type> typeargtypes,
678 Symbol sym,
679 Symbol bestSoFar,
680 boolean allowBoxing,
681 boolean useVarargs,
682 boolean operator) {
683 if (sym.kind == ERR) return bestSoFar;
684 if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
685 Assert.check(sym.kind < AMBIGUOUS);
686 try {
687 rawInstantiate(env, site, sym, argtypes, typeargtypes,
688 allowBoxing, useVarargs, Warner.noWarnings);
689 } catch (InapplicableMethodException ex) {
690 switch (bestSoFar.kind) {
691 case ABSENT_MTH:
692 return wrongMethod.setWrongSym(sym, ex.getDiagnostic());
693 case WRONG_MTH:
694 if (operator) return bestSoFar;
695 wrongMethods.addCandidate(currentStep, wrongMethod.sym, wrongMethod.explanation);
696 case WRONG_MTHS:
697 return wrongMethods.addCandidate(currentStep, sym, ex.getDiagnostic());
698 default:
699 return bestSoFar;
700 }
701 }
702 if (!isAccessible(env, site, sym)) {
703 return (bestSoFar.kind == ABSENT_MTH)
704 ? new AccessError(env, site, sym)
705 : bestSoFar;
706 }
707 return (bestSoFar.kind > AMBIGUOUS)
708 ? sym
709 : mostSpecific(sym, bestSoFar, env, site,
710 allowBoxing && operator, useVarargs);
711 }
713 /* Return the most specific of the two methods for a call,
714 * given that both are accessible and applicable.
715 * @param m1 A new candidate for most specific.
716 * @param m2 The previous most specific candidate.
717 * @param env The current environment.
718 * @param site The original type from where the selection
719 * takes place.
720 * @param allowBoxing Allow boxing conversions of arguments.
721 * @param useVarargs Box trailing arguments into an array for varargs.
722 */
723 Symbol mostSpecific(Symbol m1,
724 Symbol m2,
725 Env<AttrContext> env,
726 final Type site,
727 boolean allowBoxing,
728 boolean useVarargs) {
729 switch (m2.kind) {
730 case MTH:
731 if (m1 == m2) return m1;
732 boolean m1SignatureMoreSpecific = signatureMoreSpecific(env, site, m1, m2, allowBoxing, useVarargs);
733 boolean m2SignatureMoreSpecific = signatureMoreSpecific(env, site, m2, m1, allowBoxing, useVarargs);
734 if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
735 Type mt1 = types.memberType(site, m1);
736 Type mt2 = types.memberType(site, m2);
737 if (!types.overrideEquivalent(mt1, mt2))
738 return ambiguityError(m1, m2);
740 // same signature; select (a) the non-bridge method, or
741 // (b) the one that overrides the other, or (c) the concrete
742 // one, or (d) merge both abstract signatures
743 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
744 return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
746 // if one overrides or hides the other, use it
747 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
748 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
749 if (types.asSuper(m1Owner.type, m2Owner) != null &&
750 ((m1.owner.flags_field & INTERFACE) == 0 ||
751 (m2.owner.flags_field & INTERFACE) != 0) &&
752 m1.overrides(m2, m1Owner, types, false))
753 return m1;
754 if (types.asSuper(m2Owner.type, m1Owner) != null &&
755 ((m2.owner.flags_field & INTERFACE) == 0 ||
756 (m1.owner.flags_field & INTERFACE) != 0) &&
757 m2.overrides(m1, m2Owner, types, false))
758 return m2;
759 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
760 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
761 if (m1Abstract && !m2Abstract) return m2;
762 if (m2Abstract && !m1Abstract) return m1;
763 // both abstract or both concrete
764 if (!m1Abstract && !m2Abstract)
765 return ambiguityError(m1, m2);
766 // check that both signatures have the same erasure
767 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
768 m2.erasure(types).getParameterTypes()))
769 return ambiguityError(m1, m2);
770 // both abstract, neither overridden; merge throws clause and result type
771 Type mst = mostSpecificReturnType(mt1, mt2);
772 if (mst == null) {
773 // Theoretically, this can't happen, but it is possible
774 // due to error recovery or mixing incompatible class files
775 return ambiguityError(m1, m2);
776 }
777 Symbol mostSpecific = mst == mt1 ? m1 : m2;
778 List<Type> allThrown = chk.intersect(mt1.getThrownTypes(), mt2.getThrownTypes());
779 Type newSig = types.createMethodTypeWithThrown(mostSpecific.type, allThrown);
780 MethodSymbol result = new MethodSymbol(
781 mostSpecific.flags(),
782 mostSpecific.name,
783 newSig,
784 mostSpecific.owner) {
785 @Override
786 public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
787 if (origin == site.tsym)
788 return this;
789 else
790 return super.implementation(origin, types, checkResult);
791 }
792 };
793 return result;
794 }
795 if (m1SignatureMoreSpecific) return m1;
796 if (m2SignatureMoreSpecific) return m2;
797 return ambiguityError(m1, m2);
798 case AMBIGUOUS:
799 AmbiguityError e = (AmbiguityError)m2;
800 Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
801 Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
802 if (err1 == err2) return err1;
803 if (err1 == e.sym && err2 == e.sym2) return m2;
804 if (err1 instanceof AmbiguityError &&
805 err2 instanceof AmbiguityError &&
806 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
807 return ambiguityError(m1, m2);
808 else
809 return ambiguityError(err1, err2);
810 default:
811 throw new AssertionError();
812 }
813 }
814 //where
815 private boolean signatureMoreSpecific(Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
816 noteWarner.clear();
817 Type mtype1 = types.memberType(site, adjustVarargs(m1, m2, useVarargs));
818 Type mtype2 = instantiate(env, site, adjustVarargs(m2, m1, useVarargs),
819 types.lowerBoundArgtypes(mtype1), null,
820 allowBoxing, false, noteWarner);
821 return mtype2 != null &&
822 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
823 }
824 //where
825 private Symbol adjustVarargs(Symbol to, Symbol from, boolean useVarargs) {
826 List<Type> fromArgs = from.type.getParameterTypes();
827 List<Type> toArgs = to.type.getParameterTypes();
828 if (useVarargs &&
829 (from.flags() & VARARGS) != 0 &&
830 (to.flags() & VARARGS) != 0) {
831 Type varargsTypeFrom = fromArgs.last();
832 Type varargsTypeTo = toArgs.last();
833 ListBuffer<Type> args = ListBuffer.lb();
834 if (toArgs.length() < fromArgs.length()) {
835 //if we are checking a varargs method 'from' against another varargs
836 //method 'to' (where arity of 'to' < arity of 'from') then expand signature
837 //of 'to' to 'fit' arity of 'from' (this means adding fake formals to 'to'
838 //until 'to' signature has the same arity as 'from')
839 while (fromArgs.head != varargsTypeFrom) {
840 args.append(toArgs.head == varargsTypeTo ? types.elemtype(varargsTypeTo) : toArgs.head);
841 fromArgs = fromArgs.tail;
842 toArgs = toArgs.head == varargsTypeTo ?
843 toArgs :
844 toArgs.tail;
845 }
846 } else {
847 //formal argument list is same as original list where last
848 //argument (array type) is removed
849 args.appendList(toArgs.reverse().tail.reverse());
850 }
851 //append varargs element type as last synthetic formal
852 args.append(types.elemtype(varargsTypeTo));
853 Type mtype = types.createMethodTypeWithParameters(to.type, args.toList());
854 return new MethodSymbol(to.flags_field & ~VARARGS, to.name, mtype, to.owner);
855 } else {
856 return to;
857 }
858 }
859 //where
860 Type mostSpecificReturnType(Type mt1, Type mt2) {
861 Type rt1 = mt1.getReturnType();
862 Type rt2 = mt2.getReturnType();
864 if (mt1.tag == FORALL && mt2.tag == FORALL) {
865 //if both are generic methods, adjust return type ahead of subtyping check
866 rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
867 }
868 //first use subtyping, then return type substitutability
869 if (types.isSubtype(rt1, rt2)) {
870 return mt1;
871 } else if (types.isSubtype(rt2, rt1)) {
872 return mt2;
873 } else if (types.returnTypeSubstitutable(mt1, mt2)) {
874 return mt1;
875 } else if (types.returnTypeSubstitutable(mt2, mt1)) {
876 return mt2;
877 } else {
878 return null;
879 }
880 }
881 //where
882 Symbol ambiguityError(Symbol m1, Symbol m2) {
883 if (((m1.flags() | m2.flags()) & CLASH) != 0) {
884 return (m1.flags() & CLASH) == 0 ? m1 : m2;
885 } else {
886 return new AmbiguityError(m1, m2);
887 }
888 }
890 /** Find best qualified method matching given name, type and value
891 * arguments.
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 * @param allowBoxing Allow boxing conversions of arguments.
899 * @param useVarargs Box trailing arguments into an array for varargs.
900 */
901 Symbol findMethod(Env<AttrContext> env,
902 Type site,
903 Name name,
904 List<Type> argtypes,
905 List<Type> typeargtypes,
906 boolean allowBoxing,
907 boolean useVarargs,
908 boolean operator) {
909 Symbol bestSoFar = methodNotFound;
910 return findMethod(env,
911 site,
912 name,
913 argtypes,
914 typeargtypes,
915 site.tsym.type,
916 true,
917 bestSoFar,
918 allowBoxing,
919 useVarargs,
920 operator,
921 new HashSet<TypeSymbol>());
922 }
923 // where
924 private Symbol findMethod(Env<AttrContext> env,
925 Type site,
926 Name name,
927 List<Type> argtypes,
928 List<Type> typeargtypes,
929 Type intype,
930 boolean abstractok,
931 Symbol bestSoFar,
932 boolean allowBoxing,
933 boolean useVarargs,
934 boolean operator,
935 Set<TypeSymbol> seen) {
936 for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
937 while (ct.tag == TYPEVAR)
938 ct = ct.getUpperBound();
939 ClassSymbol c = (ClassSymbol)ct.tsym;
940 if (!seen.add(c)) return bestSoFar;
941 if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
942 abstractok = false;
943 for (Scope.Entry e = c.members().lookup(name);
944 e.scope != null;
945 e = e.next()) {
946 //- System.out.println(" e " + e.sym);
947 if (e.sym.kind == MTH &&
948 (e.sym.flags_field & SYNTHETIC) == 0) {
949 bestSoFar = selectBest(env, site, argtypes, typeargtypes,
950 e.sym, bestSoFar,
951 allowBoxing,
952 useVarargs,
953 operator);
954 }
955 }
956 if (name == names.init)
957 break;
958 //- System.out.println(" - " + bestSoFar);
959 if (abstractok) {
960 Symbol concrete = methodNotFound;
961 if ((bestSoFar.flags() & ABSTRACT) == 0)
962 concrete = bestSoFar;
963 for (List<Type> l = types.interfaces(c.type);
964 l.nonEmpty();
965 l = l.tail) {
966 bestSoFar = findMethod(env, site, name, argtypes,
967 typeargtypes,
968 l.head, abstractok, bestSoFar,
969 allowBoxing, useVarargs, operator, seen);
970 }
971 if (concrete != bestSoFar &&
972 concrete.kind < ERR && bestSoFar.kind < ERR &&
973 types.isSubSignature(concrete.type, bestSoFar.type))
974 bestSoFar = concrete;
975 }
976 }
977 return bestSoFar;
978 }
980 /** Find unqualified method matching given name, type and value arguments.
981 * @param env The current environment.
982 * @param name The method's name.
983 * @param argtypes The method's value arguments.
984 * @param typeargtypes The method's type arguments.
985 * @param allowBoxing Allow boxing conversions of arguments.
986 * @param useVarargs Box trailing arguments into an array for varargs.
987 */
988 Symbol findFun(Env<AttrContext> env, Name name,
989 List<Type> argtypes, List<Type> typeargtypes,
990 boolean allowBoxing, boolean useVarargs) {
991 Symbol bestSoFar = methodNotFound;
992 Symbol sym;
993 Env<AttrContext> env1 = env;
994 boolean staticOnly = false;
995 while (env1.outer != null) {
996 if (isStatic(env1)) staticOnly = true;
997 sym = findMethod(
998 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
999 allowBoxing, useVarargs, false);
1000 if (sym.exists()) {
1001 if (staticOnly &&
1002 sym.kind == MTH &&
1003 sym.owner.kind == TYP &&
1004 (sym.flags() & STATIC) == 0) return new StaticError(sym);
1005 else return sym;
1006 } else if (sym.kind < bestSoFar.kind) {
1007 bestSoFar = sym;
1008 }
1009 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1010 env1 = env1.outer;
1011 }
1013 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1014 typeargtypes, allowBoxing, useVarargs, false);
1015 if (sym.exists())
1016 return sym;
1018 Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
1019 for (; e.scope != null; e = e.next()) {
1020 sym = e.sym;
1021 Type origin = e.getOrigin().owner.type;
1022 if (sym.kind == MTH) {
1023 if (e.sym.owner.type != origin)
1024 sym = sym.clone(e.getOrigin().owner);
1025 if (!isAccessible(env, origin, sym))
1026 sym = new AccessError(env, origin, sym);
1027 bestSoFar = selectBest(env, origin,
1028 argtypes, typeargtypes,
1029 sym, bestSoFar,
1030 allowBoxing, useVarargs, false);
1031 }
1032 }
1033 if (bestSoFar.exists())
1034 return bestSoFar;
1036 e = env.toplevel.starImportScope.lookup(name);
1037 for (; e.scope != null; e = e.next()) {
1038 sym = e.sym;
1039 Type origin = e.getOrigin().owner.type;
1040 if (sym.kind == MTH) {
1041 if (e.sym.owner.type != origin)
1042 sym = sym.clone(e.getOrigin().owner);
1043 if (!isAccessible(env, origin, sym))
1044 sym = new AccessError(env, origin, sym);
1045 bestSoFar = selectBest(env, origin,
1046 argtypes, typeargtypes,
1047 sym, bestSoFar,
1048 allowBoxing, useVarargs, false);
1049 }
1050 }
1051 return bestSoFar;
1052 }
1054 /** Load toplevel or member class with given fully qualified name and
1055 * verify that it is accessible.
1056 * @param env The current environment.
1057 * @param name The fully qualified name of the class to be loaded.
1058 */
1059 Symbol loadClass(Env<AttrContext> env, Name name) {
1060 try {
1061 ClassSymbol c = reader.loadClass(name);
1062 return isAccessible(env, c) ? c : new AccessError(c);
1063 } catch (ClassReader.BadClassFile err) {
1064 throw err;
1065 } catch (CompletionFailure ex) {
1066 return typeNotFound;
1067 }
1068 }
1070 /** Find qualified member type.
1071 * @param env The current environment.
1072 * @param site The original type from where the selection takes
1073 * place.
1074 * @param name The type's name.
1075 * @param c The class to search for the member type. This is
1076 * always a superclass or implemented interface of
1077 * site's class.
1078 */
1079 Symbol findMemberType(Env<AttrContext> env,
1080 Type site,
1081 Name name,
1082 TypeSymbol c) {
1083 Symbol bestSoFar = typeNotFound;
1084 Symbol sym;
1085 Scope.Entry e = c.members().lookup(name);
1086 while (e.scope != null) {
1087 if (e.sym.kind == TYP) {
1088 return isAccessible(env, site, e.sym)
1089 ? e.sym
1090 : new AccessError(env, site, e.sym);
1091 }
1092 e = e.next();
1093 }
1094 Type st = types.supertype(c.type);
1095 if (st != null && st.tag == CLASS) {
1096 sym = findMemberType(env, site, name, st.tsym);
1097 if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1098 }
1099 for (List<Type> l = types.interfaces(c.type);
1100 bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
1101 l = l.tail) {
1102 sym = findMemberType(env, site, name, l.head.tsym);
1103 if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
1104 sym.owner != bestSoFar.owner)
1105 bestSoFar = new AmbiguityError(bestSoFar, sym);
1106 else if (sym.kind < bestSoFar.kind)
1107 bestSoFar = sym;
1108 }
1109 return bestSoFar;
1110 }
1112 /** Find a global type in given scope and load corresponding class.
1113 * @param env The current environment.
1114 * @param scope The scope in which to look for the type.
1115 * @param name The type's name.
1116 */
1117 Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
1118 Symbol bestSoFar = typeNotFound;
1119 for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
1120 Symbol sym = loadClass(env, e.sym.flatName());
1121 if (bestSoFar.kind == TYP && sym.kind == TYP &&
1122 bestSoFar != sym)
1123 return new AmbiguityError(bestSoFar, sym);
1124 else if (sym.kind < bestSoFar.kind)
1125 bestSoFar = sym;
1126 }
1127 return bestSoFar;
1128 }
1130 /** Find an unqualified type symbol.
1131 * @param env The current environment.
1132 * @param name The type's name.
1133 */
1134 Symbol findType(Env<AttrContext> env, Name name) {
1135 Symbol bestSoFar = typeNotFound;
1136 Symbol sym;
1137 boolean staticOnly = false;
1138 for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
1139 if (isStatic(env1)) staticOnly = true;
1140 for (Scope.Entry e = env1.info.scope.lookup(name);
1141 e.scope != null;
1142 e = e.next()) {
1143 if (e.sym.kind == TYP) {
1144 if (staticOnly &&
1145 e.sym.type.tag == TYPEVAR &&
1146 e.sym.owner.kind == TYP) return new StaticError(e.sym);
1147 return e.sym;
1148 }
1149 }
1151 sym = findMemberType(env1, env1.enclClass.sym.type, name,
1152 env1.enclClass.sym);
1153 if (staticOnly && sym.kind == TYP &&
1154 sym.type.tag == CLASS &&
1155 sym.type.getEnclosingType().tag == CLASS &&
1156 env1.enclClass.sym.type.isParameterized() &&
1157 sym.type.getEnclosingType().isParameterized())
1158 return new StaticError(sym);
1159 else if (sym.exists()) return sym;
1160 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1162 JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
1163 if ((encl.sym.flags() & STATIC) != 0)
1164 staticOnly = true;
1165 }
1167 if (env.tree.getTag() != JCTree.IMPORT) {
1168 sym = findGlobalType(env, env.toplevel.namedImportScope, name);
1169 if (sym.exists()) return sym;
1170 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1172 sym = findGlobalType(env, env.toplevel.packge.members(), name);
1173 if (sym.exists()) return sym;
1174 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1176 sym = findGlobalType(env, env.toplevel.starImportScope, name);
1177 if (sym.exists()) return sym;
1178 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1179 }
1181 return bestSoFar;
1182 }
1184 /** Find an unqualified identifier which matches a specified kind set.
1185 * @param env The current environment.
1186 * @param name The indentifier's name.
1187 * @param kind Indicates the possible symbol kinds
1188 * (a subset of VAL, TYP, PCK).
1189 */
1190 Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
1191 Symbol bestSoFar = typeNotFound;
1192 Symbol sym;
1194 if ((kind & VAR) != 0) {
1195 sym = findVar(env, name);
1196 if (sym.exists()) return sym;
1197 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1198 }
1200 if ((kind & TYP) != 0) {
1201 sym = findType(env, name);
1202 if (sym.exists()) return sym;
1203 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1204 }
1206 if ((kind & PCK) != 0) return reader.enterPackage(name);
1207 else return bestSoFar;
1208 }
1210 /** Find an identifier in a package which matches a specified kind set.
1211 * @param env The current environment.
1212 * @param name The identifier's name.
1213 * @param kind Indicates the possible symbol kinds
1214 * (a nonempty subset of TYP, PCK).
1215 */
1216 Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
1217 Name name, int kind) {
1218 Name fullname = TypeSymbol.formFullName(name, pck);
1219 Symbol bestSoFar = typeNotFound;
1220 PackageSymbol pack = null;
1221 if ((kind & PCK) != 0) {
1222 pack = reader.enterPackage(fullname);
1223 if (pack.exists()) return pack;
1224 }
1225 if ((kind & TYP) != 0) {
1226 Symbol sym = loadClass(env, fullname);
1227 if (sym.exists()) {
1228 // don't allow programs to use flatnames
1229 if (name == sym.name) return sym;
1230 }
1231 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1232 }
1233 return (pack != null) ? pack : bestSoFar;
1234 }
1236 /** Find an identifier among the members of a given type `site'.
1237 * @param env The current environment.
1238 * @param site The type containing the symbol to be found.
1239 * @param name The identifier's name.
1240 * @param kind Indicates the possible symbol kinds
1241 * (a subset of VAL, TYP).
1242 */
1243 Symbol findIdentInType(Env<AttrContext> env, Type site,
1244 Name name, int kind) {
1245 Symbol bestSoFar = typeNotFound;
1246 Symbol sym;
1247 if ((kind & VAR) != 0) {
1248 sym = findField(env, site, name, site.tsym);
1249 if (sym.exists()) return sym;
1250 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1251 }
1253 if ((kind & TYP) != 0) {
1254 sym = findMemberType(env, site, name, site.tsym);
1255 if (sym.exists()) return sym;
1256 else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
1257 }
1258 return bestSoFar;
1259 }
1261 /* ***************************************************************************
1262 * Access checking
1263 * The following methods convert ResolveErrors to ErrorSymbols, issuing
1264 * an error message in the process
1265 ****************************************************************************/
1267 /** If `sym' is a bad symbol: report error and return errSymbol
1268 * else pass through unchanged,
1269 * additional arguments duplicate what has been used in trying to find the
1270 * symbol (--> flyweight pattern). This improves performance since we
1271 * expect misses to happen frequently.
1272 *
1273 * @param sym The symbol that was found, or a ResolveError.
1274 * @param pos The position to use for error reporting.
1275 * @param site The original type from where the selection took place.
1276 * @param name The symbol's name.
1277 * @param argtypes The invocation's value arguments,
1278 * if we looked for a method.
1279 * @param typeargtypes The invocation's type arguments,
1280 * if we looked for a method.
1281 */
1282 Symbol access(Symbol sym,
1283 DiagnosticPosition pos,
1284 Symbol location,
1285 Type site,
1286 Name name,
1287 boolean qualified,
1288 List<Type> argtypes,
1289 List<Type> typeargtypes) {
1290 if (sym.kind >= AMBIGUOUS) {
1291 ResolveError errSym = (ResolveError)sym;
1292 if (!site.isErroneous() &&
1293 !Type.isErroneous(argtypes) &&
1294 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
1295 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
1296 sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
1297 }
1298 return sym;
1299 }
1301 /** Same as original access(), but without location.
1302 */
1303 Symbol access(Symbol sym,
1304 DiagnosticPosition pos,
1305 Type site,
1306 Name name,
1307 boolean qualified,
1308 List<Type> argtypes,
1309 List<Type> typeargtypes) {
1310 return access(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
1311 }
1313 /** Same as original access(), but without type arguments and arguments.
1314 */
1315 Symbol access(Symbol sym,
1316 DiagnosticPosition pos,
1317 Symbol location,
1318 Type site,
1319 Name name,
1320 boolean qualified) {
1321 if (sym.kind >= AMBIGUOUS)
1322 return access(sym, pos, location, site, name, qualified, List.<Type>nil(), null);
1323 else
1324 return sym;
1325 }
1327 /** Same as original access(), but without location, type arguments and arguments.
1328 */
1329 Symbol access(Symbol sym,
1330 DiagnosticPosition pos,
1331 Type site,
1332 Name name,
1333 boolean qualified) {
1334 return access(sym, pos, site.tsym, site, name, qualified);
1335 }
1337 /** Check that sym is not an abstract method.
1338 */
1339 void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
1340 if ((sym.flags() & ABSTRACT) != 0)
1341 log.error(pos, "abstract.cant.be.accessed.directly",
1342 kindName(sym), sym, sym.location());
1343 }
1345 /* ***************************************************************************
1346 * Debugging
1347 ****************************************************************************/
1349 /** print all scopes starting with scope s and proceeding outwards.
1350 * used for debugging.
1351 */
1352 public void printscopes(Scope s) {
1353 while (s != null) {
1354 if (s.owner != null)
1355 System.err.print(s.owner + ": ");
1356 for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
1357 if ((e.sym.flags() & ABSTRACT) != 0)
1358 System.err.print("abstract ");
1359 System.err.print(e.sym + " ");
1360 }
1361 System.err.println();
1362 s = s.next;
1363 }
1364 }
1366 void printscopes(Env<AttrContext> env) {
1367 while (env.outer != null) {
1368 System.err.println("------------------------------");
1369 printscopes(env.info.scope);
1370 env = env.outer;
1371 }
1372 }
1374 public void printscopes(Type t) {
1375 while (t.tag == CLASS) {
1376 printscopes(t.tsym.members());
1377 t = types.supertype(t);
1378 }
1379 }
1381 /* ***************************************************************************
1382 * Name resolution
1383 * Naming conventions are as for symbol lookup
1384 * Unlike the find... methods these methods will report access errors
1385 ****************************************************************************/
1387 /** Resolve an unqualified (non-method) identifier.
1388 * @param pos The position to use for error reporting.
1389 * @param env The environment current at the identifier use.
1390 * @param name The identifier's name.
1391 * @param kind The set of admissible symbol kinds for the identifier.
1392 */
1393 Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
1394 Name name, int kind) {
1395 return access(
1396 findIdent(env, name, kind),
1397 pos, env.enclClass.sym.type, name, false);
1398 }
1400 /** Resolve an unqualified method identifier.
1401 * @param pos The position to use for error reporting.
1402 * @param env The environment current at the method invocation.
1403 * @param name The identifier's name.
1404 * @param argtypes The types of the invocation's value arguments.
1405 * @param typeargtypes The types of the invocation's type arguments.
1406 */
1407 Symbol resolveMethod(DiagnosticPosition pos,
1408 Env<AttrContext> env,
1409 Name name,
1410 List<Type> argtypes,
1411 List<Type> typeargtypes) {
1412 Symbol sym = startResolution();
1413 List<MethodResolutionPhase> steps = methodResolutionSteps;
1414 while (steps.nonEmpty() &&
1415 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1416 sym.kind >= ERRONEOUS) {
1417 currentStep = steps.head;
1418 sym = findFun(env, name, argtypes, typeargtypes,
1419 steps.head.isBoxingRequired,
1420 env.info.varArgs = steps.head.isVarargsRequired);
1421 methodResolutionCache.put(steps.head, sym);
1422 steps = steps.tail;
1423 }
1424 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1425 MethodResolutionPhase errPhase =
1426 firstErroneousResolutionPhase();
1427 sym = access(methodResolutionCache.get(errPhase),
1428 pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
1429 env.info.varArgs = errPhase.isVarargsRequired;
1430 }
1431 return sym;
1432 }
1434 private Symbol startResolution() {
1435 wrongMethod.clear();
1436 wrongMethods.clear();
1437 return methodNotFound;
1438 }
1440 /** Resolve a qualified method identifier
1441 * @param pos The position to use for error reporting.
1442 * @param env The environment current at the method invocation.
1443 * @param site The type of the qualifying expression, in which
1444 * identifier is searched.
1445 * @param name The identifier's name.
1446 * @param argtypes The types of the invocation's value arguments.
1447 * @param typeargtypes The types of the invocation's type arguments.
1448 */
1449 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1450 Type site, Name name, List<Type> argtypes,
1451 List<Type> typeargtypes) {
1452 return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
1453 }
1454 Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
1455 Symbol location, Type site, Name name, List<Type> argtypes,
1456 List<Type> typeargtypes) {
1457 Symbol sym = startResolution();
1458 List<MethodResolutionPhase> steps = methodResolutionSteps;
1459 while (steps.nonEmpty() &&
1460 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1461 sym.kind >= ERRONEOUS) {
1462 currentStep = steps.head;
1463 sym = findMethod(env, site, name, argtypes, typeargtypes,
1464 steps.head.isBoxingRequired(),
1465 env.info.varArgs = steps.head.isVarargsRequired(), false);
1466 methodResolutionCache.put(steps.head, sym);
1467 steps = steps.tail;
1468 }
1469 if (sym.kind >= AMBIGUOUS) {
1470 if (site.tsym.isPolymorphicSignatureGeneric()) {
1471 //polymorphic receiver - synthesize new method symbol
1472 env.info.varArgs = false;
1473 sym = findPolymorphicSignatureInstance(env,
1474 site, name, null, argtypes);
1475 }
1476 else {
1477 //if nothing is found return the 'first' error
1478 MethodResolutionPhase errPhase =
1479 firstErroneousResolutionPhase();
1480 sym = access(methodResolutionCache.get(errPhase),
1481 pos, location, site, name, true, argtypes, typeargtypes);
1482 env.info.varArgs = errPhase.isVarargsRequired;
1483 }
1484 } else if (allowMethodHandles && sym.isPolymorphicSignatureGeneric()) {
1485 //non-instantiated polymorphic signature - synthesize new method symbol
1486 env.info.varArgs = false;
1487 sym = findPolymorphicSignatureInstance(env,
1488 site, name, (MethodSymbol)sym, argtypes);
1489 }
1490 return sym;
1491 }
1493 /** Find or create an implicit method of exactly the given type (after erasure).
1494 * Searches in a side table, not the main scope of the site.
1495 * This emulates the lookup process required by JSR 292 in JVM.
1496 * @param env Attribution environment
1497 * @param site The original type from where the selection takes place.
1498 * @param name The method's name.
1499 * @param spMethod A template for the implicit method, or null.
1500 * @param argtypes The required argument types.
1501 * @param typeargtypes The required type arguments.
1502 */
1503 Symbol findPolymorphicSignatureInstance(Env<AttrContext> env, Type site,
1504 Name name,
1505 MethodSymbol spMethod, // sig. poly. method or null if none
1506 List<Type> argtypes) {
1507 Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
1508 site, name, spMethod, argtypes);
1509 long flags = ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE |
1510 (spMethod != null ?
1511 spMethod.flags() & Flags.AccessFlags :
1512 Flags.PUBLIC | Flags.STATIC);
1513 Symbol m = null;
1514 for (Scope.Entry e = polymorphicSignatureScope.lookup(name);
1515 e.scope != null;
1516 e = e.next()) {
1517 Symbol sym = e.sym;
1518 if (types.isSameType(mtype, sym.type) &&
1519 (sym.flags() & Flags.STATIC) == (flags & Flags.STATIC) &&
1520 types.isSameType(sym.owner.type, site)) {
1521 m = sym;
1522 break;
1523 }
1524 }
1525 if (m == null) {
1526 // create the desired method
1527 m = new MethodSymbol(flags, name, mtype, site.tsym);
1528 polymorphicSignatureScope.enter(m);
1529 }
1530 return m;
1531 }
1533 /** Resolve a qualified method identifier, throw a fatal error if not
1534 * found.
1535 * @param pos The position to use for error reporting.
1536 * @param env The environment current at the method invocation.
1537 * @param site The type of the qualifying expression, in which
1538 * identifier is searched.
1539 * @param name The identifier's name.
1540 * @param argtypes The types of the invocation's value arguments.
1541 * @param typeargtypes The types of the invocation's type arguments.
1542 */
1543 public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
1544 Type site, Name name,
1545 List<Type> argtypes,
1546 List<Type> typeargtypes) {
1547 Symbol sym = resolveQualifiedMethod(
1548 pos, env, site.tsym, site, name, argtypes, typeargtypes);
1549 if (sym.kind == MTH) return (MethodSymbol)sym;
1550 else throw new FatalError(
1551 diags.fragment("fatal.err.cant.locate.meth",
1552 name));
1553 }
1555 /** Resolve constructor.
1556 * @param pos The position to use for error reporting.
1557 * @param env The environment current at the constructor invocation.
1558 * @param site The type of class for which a constructor is searched.
1559 * @param argtypes The types of the constructor invocation's value
1560 * arguments.
1561 * @param typeargtypes The types of the constructor invocation's type
1562 * arguments.
1563 */
1564 Symbol resolveConstructor(DiagnosticPosition pos,
1565 Env<AttrContext> env,
1566 Type site,
1567 List<Type> argtypes,
1568 List<Type> typeargtypes) {
1569 Symbol sym = startResolution();
1570 List<MethodResolutionPhase> steps = methodResolutionSteps;
1571 while (steps.nonEmpty() &&
1572 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1573 sym.kind >= ERRONEOUS) {
1574 currentStep = steps.head;
1575 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1576 steps.head.isBoxingRequired(),
1577 env.info.varArgs = steps.head.isVarargsRequired());
1578 methodResolutionCache.put(steps.head, sym);
1579 steps = steps.tail;
1580 }
1581 if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
1582 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1583 sym = access(methodResolutionCache.get(errPhase),
1584 pos, site, names.init, true, argtypes, typeargtypes);
1585 env.info.varArgs = errPhase.isVarargsRequired();
1586 }
1587 return sym;
1588 }
1590 /** Resolve constructor using diamond inference.
1591 * @param pos The position to use for error reporting.
1592 * @param env The environment current at the constructor invocation.
1593 * @param site The type of class for which a constructor is searched.
1594 * The scope of this class has been touched in attribution.
1595 * @param argtypes The types of the constructor invocation's value
1596 * arguments.
1597 * @param typeargtypes The types of the constructor invocation's type
1598 * arguments.
1599 */
1600 Symbol resolveDiamond(DiagnosticPosition pos,
1601 Env<AttrContext> env,
1602 Type site,
1603 List<Type> argtypes,
1604 List<Type> typeargtypes) {
1605 Symbol sym = startResolution();
1606 List<MethodResolutionPhase> steps = methodResolutionSteps;
1607 while (steps.nonEmpty() &&
1608 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
1609 sym.kind >= ERRONEOUS) {
1610 currentStep = steps.head;
1611 sym = resolveConstructor(pos, env, site, argtypes, typeargtypes,
1612 steps.head.isBoxingRequired(),
1613 env.info.varArgs = steps.head.isVarargsRequired());
1614 methodResolutionCache.put(steps.head, sym);
1615 steps = steps.tail;
1616 }
1617 if (sym.kind >= AMBIGUOUS) {
1618 final JCDiagnostic details = sym.kind == WRONG_MTH ?
1619 ((InapplicableSymbolError)sym).explanation :
1620 null;
1621 Symbol errSym = new ResolveError(WRONG_MTH, "diamond error") {
1622 @Override
1623 JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
1624 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
1625 String key = details == null ?
1626 "cant.apply.diamond" :
1627 "cant.apply.diamond.1";
1628 return diags.create(dkind, log.currentSource(), pos, key,
1629 diags.fragment("diamond", site.tsym), details);
1630 }
1631 };
1632 MethodResolutionPhase errPhase = firstErroneousResolutionPhase();
1633 sym = access(errSym, pos, site, names.init, true, argtypes, typeargtypes);
1634 env.info.varArgs = errPhase.isVarargsRequired();
1635 }
1636 return sym;
1637 }
1639 /** Resolve constructor.
1640 * @param pos The position to use for error reporting.
1641 * @param env The environment current at the constructor invocation.
1642 * @param site The type of class for which a constructor is searched.
1643 * @param argtypes The types of the constructor invocation's value
1644 * arguments.
1645 * @param typeargtypes The types of the constructor invocation's type
1646 * arguments.
1647 * @param allowBoxing Allow boxing and varargs conversions.
1648 * @param useVarargs Box trailing arguments into an array for varargs.
1649 */
1650 Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1651 Type site, List<Type> argtypes,
1652 List<Type> typeargtypes,
1653 boolean allowBoxing,
1654 boolean useVarargs) {
1655 Symbol sym = findMethod(env, site,
1656 names.init, argtypes,
1657 typeargtypes, allowBoxing,
1658 useVarargs, false);
1659 chk.checkDeprecated(pos, env.info.scope.owner, sym);
1660 return sym;
1661 }
1663 /** Resolve a constructor, throw a fatal error if not found.
1664 * @param pos The position to use for error reporting.
1665 * @param env The environment current at the method invocation.
1666 * @param site The type to be constructed.
1667 * @param argtypes The types of the invocation's value arguments.
1668 * @param typeargtypes The types of the invocation's type arguments.
1669 */
1670 public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
1671 Type site,
1672 List<Type> argtypes,
1673 List<Type> typeargtypes) {
1674 Symbol sym = resolveConstructor(
1675 pos, env, site, argtypes, typeargtypes);
1676 if (sym.kind == MTH) return (MethodSymbol)sym;
1677 else throw new FatalError(
1678 diags.fragment("fatal.err.cant.locate.ctor", site));
1679 }
1681 /** Resolve operator.
1682 * @param pos The position to use for error reporting.
1683 * @param optag The tag of the operation tree.
1684 * @param env The environment current at the operation.
1685 * @param argtypes The types of the operands.
1686 */
1687 Symbol resolveOperator(DiagnosticPosition pos, int optag,
1688 Env<AttrContext> env, List<Type> argtypes) {
1689 startResolution();
1690 Name name = treeinfo.operatorName(optag);
1691 Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
1692 null, false, false, true);
1693 if (boxingEnabled && sym.kind >= WRONG_MTHS)
1694 sym = findMethod(env, syms.predefClass.type, name, argtypes,
1695 null, true, false, true);
1696 return access(sym, pos, env.enclClass.sym.type, name,
1697 false, argtypes, null);
1698 }
1700 /** Resolve operator.
1701 * @param pos The position to use for error reporting.
1702 * @param optag The tag of the operation tree.
1703 * @param env The environment current at the operation.
1704 * @param arg The type of the operand.
1705 */
1706 Symbol resolveUnaryOperator(DiagnosticPosition pos, int optag, Env<AttrContext> env, Type arg) {
1707 return resolveOperator(pos, optag, env, List.of(arg));
1708 }
1710 /** Resolve binary operator.
1711 * @param pos The position to use for error reporting.
1712 * @param optag The tag of the operation tree.
1713 * @param env The environment current at the operation.
1714 * @param left The types of the left operand.
1715 * @param right The types of the right operand.
1716 */
1717 Symbol resolveBinaryOperator(DiagnosticPosition pos,
1718 int optag,
1719 Env<AttrContext> env,
1720 Type left,
1721 Type right) {
1722 return resolveOperator(pos, optag, env, List.of(left, right));
1723 }
1725 /**
1726 * Resolve `c.name' where name == this or name == super.
1727 * @param pos The position to use for error reporting.
1728 * @param env The environment current at the expression.
1729 * @param c The qualifier.
1730 * @param name The identifier's name.
1731 */
1732 Symbol resolveSelf(DiagnosticPosition pos,
1733 Env<AttrContext> env,
1734 TypeSymbol c,
1735 Name name) {
1736 Env<AttrContext> env1 = env;
1737 boolean staticOnly = false;
1738 while (env1.outer != null) {
1739 if (isStatic(env1)) staticOnly = true;
1740 if (env1.enclClass.sym == c) {
1741 Symbol sym = env1.info.scope.lookup(name).sym;
1742 if (sym != null) {
1743 if (staticOnly) sym = new StaticError(sym);
1744 return access(sym, pos, env.enclClass.sym.type,
1745 name, true);
1746 }
1747 }
1748 if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
1749 env1 = env1.outer;
1750 }
1751 log.error(pos, "not.encl.class", c);
1752 return syms.errSymbol;
1753 }
1755 /**
1756 * Resolve `c.this' for an enclosing class c that contains the
1757 * named member.
1758 * @param pos The position to use for error reporting.
1759 * @param env The environment current at the expression.
1760 * @param member The member that must be contained in the result.
1761 */
1762 Symbol resolveSelfContaining(DiagnosticPosition pos,
1763 Env<AttrContext> env,
1764 Symbol member,
1765 boolean isSuperCall) {
1766 Name name = names._this;
1767 Env<AttrContext> env1 = isSuperCall ? env.outer : env;
1768 boolean staticOnly = false;
1769 if (env1 != null) {
1770 while (env1 != null && env1.outer != null) {
1771 if (isStatic(env1)) staticOnly = true;
1772 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
1773 Symbol sym = env1.info.scope.lookup(name).sym;
1774 if (sym != null) {
1775 if (staticOnly) sym = new StaticError(sym);
1776 return access(sym, pos, env.enclClass.sym.type,
1777 name, true);
1778 }
1779 }
1780 if ((env1.enclClass.sym.flags() & STATIC) != 0)
1781 staticOnly = true;
1782 env1 = env1.outer;
1783 }
1784 }
1785 log.error(pos, "encl.class.required", member);
1786 return syms.errSymbol;
1787 }
1789 /**
1790 * Resolve an appropriate implicit this instance for t's container.
1791 * JLS 8.8.5.1 and 15.9.2
1792 */
1793 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
1794 return resolveImplicitThis(pos, env, t, false);
1795 }
1797 Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
1798 Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
1799 ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
1800 : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
1801 if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
1802 log.error(pos, "cant.ref.before.ctor.called", "this");
1803 return thisType;
1804 }
1806 /* ***************************************************************************
1807 * ResolveError classes, indicating error situations when accessing symbols
1808 ****************************************************************************/
1810 public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
1811 AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
1812 logResolveError(error, tree.pos(), type.getEnclosingType().tsym, type.getEnclosingType(), null, null, null);
1813 }
1814 //where
1815 private void logResolveError(ResolveError error,
1816 DiagnosticPosition pos,
1817 Symbol location,
1818 Type site,
1819 Name name,
1820 List<Type> argtypes,
1821 List<Type> typeargtypes) {
1822 JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
1823 pos, location, site, name, argtypes, typeargtypes);
1824 if (d != null) {
1825 d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
1826 log.report(d);
1827 }
1828 }
1830 private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
1832 public Object methodArguments(List<Type> argtypes) {
1833 return argtypes.isEmpty() ? noArgs : argtypes;
1834 }
1836 /**
1837 * Root class for resolution errors. Subclass of ResolveError
1838 * represent a different kinds of resolution error - as such they must
1839 * specify how they map into concrete compiler diagnostics.
1840 */
1841 private abstract class ResolveError extends Symbol {
1843 /** The name of the kind of error, for debugging only. */
1844 final String debugName;
1846 ResolveError(int kind, String debugName) {
1847 super(kind, 0, null, null, null);
1848 this.debugName = debugName;
1849 }
1851 @Override
1852 public <R, P> R accept(ElementVisitor<R, P> v, P p) {
1853 throw new AssertionError();
1854 }
1856 @Override
1857 public String toString() {
1858 return debugName;
1859 }
1861 @Override
1862 public boolean exists() {
1863 return false;
1864 }
1866 /**
1867 * Create an external representation for this erroneous symbol to be
1868 * used during attribution - by default this returns the symbol of a
1869 * brand new error type which stores the original type found
1870 * during resolution.
1871 *
1872 * @param name the name used during resolution
1873 * @param location the location from which the symbol is accessed
1874 */
1875 protected Symbol access(Name name, TypeSymbol location) {
1876 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
1877 }
1879 /**
1880 * Create a diagnostic representing this resolution error.
1881 *
1882 * @param dkind The kind of the diagnostic to be created (e.g error).
1883 * @param pos The position to be used for error reporting.
1884 * @param site The original type from where the selection took place.
1885 * @param name The name of the symbol to be resolved.
1886 * @param argtypes The invocation's value arguments,
1887 * if we looked for a method.
1888 * @param typeargtypes The invocation's type arguments,
1889 * if we looked for a method.
1890 */
1891 abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1892 DiagnosticPosition pos,
1893 Symbol location,
1894 Type site,
1895 Name name,
1896 List<Type> argtypes,
1897 List<Type> typeargtypes);
1899 /**
1900 * A name designates an operator if it consists
1901 * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
1902 */
1903 boolean isOperator(Name name) {
1904 int i = 0;
1905 while (i < name.getByteLength() &&
1906 "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
1907 return i > 0 && i == name.getByteLength();
1908 }
1909 }
1911 /**
1912 * This class is the root class of all resolution errors caused by
1913 * an invalid symbol being found during resolution.
1914 */
1915 abstract class InvalidSymbolError extends ResolveError {
1917 /** The invalid symbol found during resolution */
1918 Symbol sym;
1920 InvalidSymbolError(int kind, Symbol sym, String debugName) {
1921 super(kind, debugName);
1922 this.sym = sym;
1923 }
1925 @Override
1926 public boolean exists() {
1927 return true;
1928 }
1930 @Override
1931 public String toString() {
1932 return super.toString() + " wrongSym=" + sym;
1933 }
1935 @Override
1936 public Symbol access(Name name, TypeSymbol location) {
1937 if (sym.kind >= AMBIGUOUS)
1938 return ((ResolveError)sym).access(name, location);
1939 else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
1940 return types.createErrorType(name, location, sym.type).tsym;
1941 else
1942 return sym;
1943 }
1944 }
1946 /**
1947 * InvalidSymbolError error class indicating that a symbol matching a
1948 * given name does not exists in a given site.
1949 */
1950 class SymbolNotFoundError extends ResolveError {
1952 SymbolNotFoundError(int kind) {
1953 super(kind, "symbol not found error");
1954 }
1956 @Override
1957 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
1958 DiagnosticPosition pos,
1959 Symbol location,
1960 Type site,
1961 Name name,
1962 List<Type> argtypes,
1963 List<Type> typeargtypes) {
1964 argtypes = argtypes == null ? List.<Type>nil() : argtypes;
1965 typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
1966 if (name == names.error)
1967 return null;
1969 if (isOperator(name)) {
1970 boolean isUnaryOp = argtypes.size() == 1;
1971 String key = argtypes.size() == 1 ?
1972 "operator.cant.be.applied" :
1973 "operator.cant.be.applied.1";
1974 Type first = argtypes.head;
1975 Type second = !isUnaryOp ? argtypes.tail.head : null;
1976 return diags.create(dkind, log.currentSource(), pos,
1977 key, name, first, second);
1978 }
1979 boolean hasLocation = false;
1980 if (location == null) {
1981 location = site.tsym;
1982 }
1983 if (!location.name.isEmpty()) {
1984 if (location.kind == PCK && !site.tsym.exists()) {
1985 return diags.create(dkind, log.currentSource(), pos,
1986 "doesnt.exist", location);
1987 }
1988 hasLocation = !location.name.equals(names._this) &&
1989 !location.name.equals(names._super);
1990 }
1991 boolean isConstructor = kind == ABSENT_MTH &&
1992 name == names.table.names.init;
1993 KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
1994 Name idname = isConstructor ? site.tsym.name : name;
1995 String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
1996 if (hasLocation) {
1997 return diags.create(dkind, log.currentSource(), pos,
1998 errKey, kindname, idname, //symbol kindname, name
1999 typeargtypes, argtypes, //type parameters and arguments (if any)
2000 getLocationDiag(location, site)); //location kindname, type
2001 }
2002 else {
2003 return diags.create(dkind, log.currentSource(), pos,
2004 errKey, kindname, idname, //symbol kindname, name
2005 typeargtypes, argtypes); //type parameters and arguments (if any)
2006 }
2007 }
2008 //where
2009 private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
2010 String key = "cant.resolve";
2011 String suffix = hasLocation ? ".location" : "";
2012 switch (kindname) {
2013 case METHOD:
2014 case CONSTRUCTOR: {
2015 suffix += ".args";
2016 suffix += hasTypeArgs ? ".params" : "";
2017 }
2018 }
2019 return key + suffix;
2020 }
2021 private JCDiagnostic getLocationDiag(Symbol location, Type site) {
2022 if (location.kind == VAR) {
2023 return diags.fragment("location.1",
2024 kindName(location),
2025 location,
2026 location.type);
2027 } else {
2028 return diags.fragment("location",
2029 typeKindName(site),
2030 site,
2031 null);
2032 }
2033 }
2034 }
2036 /**
2037 * InvalidSymbolError error class indicating that a given symbol
2038 * (either a method, a constructor or an operand) is not applicable
2039 * given an actual arguments/type argument list.
2040 */
2041 class InapplicableSymbolError extends InvalidSymbolError {
2043 /** An auxiliary explanation set in case of instantiation errors. */
2044 JCDiagnostic explanation;
2046 InapplicableSymbolError(Symbol sym) {
2047 super(WRONG_MTH, sym, "inapplicable symbol error");
2048 }
2050 /** Update sym and explanation and return this.
2051 */
2052 InapplicableSymbolError setWrongSym(Symbol sym, JCDiagnostic explanation) {
2053 this.sym = sym;
2054 if (this.sym == sym && explanation != null)
2055 this.explanation = explanation; //update the details
2056 return this;
2057 }
2059 /** Update sym and return this.
2060 */
2061 InapplicableSymbolError setWrongSym(Symbol sym) {
2062 this.sym = sym;
2063 return this;
2064 }
2066 @Override
2067 public String toString() {
2068 return super.toString() + " explanation=" + explanation;
2069 }
2071 @Override
2072 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2073 DiagnosticPosition pos,
2074 Symbol location,
2075 Type site,
2076 Name name,
2077 List<Type> argtypes,
2078 List<Type> typeargtypes) {
2079 if (name == names.error)
2080 return null;
2082 if (isOperator(name)) {
2083 boolean isUnaryOp = argtypes.size() == 1;
2084 String key = argtypes.size() == 1 ?
2085 "operator.cant.be.applied" :
2086 "operator.cant.be.applied.1";
2087 Type first = argtypes.head;
2088 Type second = !isUnaryOp ? argtypes.tail.head : null;
2089 return diags.create(dkind, log.currentSource(), pos,
2090 key, name, first, second);
2091 }
2092 else {
2093 Symbol ws = sym.asMemberOf(site, types);
2094 return diags.create(dkind, log.currentSource(), pos,
2095 "cant.apply.symbol" + (explanation != null ? ".1" : ""),
2096 kindName(ws),
2097 ws.name == names.init ? ws.owner.name : ws.name,
2098 methodArguments(ws.type.getParameterTypes()),
2099 methodArguments(argtypes),
2100 kindName(ws.owner),
2101 ws.owner.type,
2102 explanation);
2103 }
2104 }
2106 void clear() {
2107 explanation = null;
2108 }
2110 @Override
2111 public Symbol access(Name name, TypeSymbol location) {
2112 return types.createErrorType(name, location, syms.errSymbol.type).tsym;
2113 }
2114 }
2116 /**
2117 * ResolveError error class indicating that a set of symbols
2118 * (either methods, constructors or operands) is not applicable
2119 * given an actual arguments/type argument list.
2120 */
2121 class InapplicableSymbolsError extends ResolveError {
2123 private List<Candidate> candidates = List.nil();
2125 InapplicableSymbolsError(Symbol sym) {
2126 super(WRONG_MTHS, "inapplicable symbols");
2127 }
2129 @Override
2130 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2131 DiagnosticPosition pos,
2132 Symbol location,
2133 Type site,
2134 Name name,
2135 List<Type> argtypes,
2136 List<Type> typeargtypes) {
2137 if (candidates.nonEmpty()) {
2138 JCDiagnostic err = diags.create(dkind,
2139 log.currentSource(),
2140 pos,
2141 "cant.apply.symbols",
2142 name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
2143 getName(),
2144 argtypes);
2145 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(site));
2146 } else {
2147 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
2148 location, site, name, argtypes, typeargtypes);
2149 }
2150 }
2152 //where
2153 List<JCDiagnostic> candidateDetails(Type site) {
2154 List<JCDiagnostic> details = List.nil();
2155 for (Candidate c : candidates)
2156 details = details.prepend(c.getDiagnostic(site));
2157 return details.reverse();
2158 }
2160 Symbol addCandidate(MethodResolutionPhase currentStep, Symbol sym, JCDiagnostic details) {
2161 Candidate c = new Candidate(currentStep, sym, details);
2162 if (c.isValid() && !candidates.contains(c))
2163 candidates = candidates.append(c);
2164 return this;
2165 }
2167 void clear() {
2168 candidates = List.nil();
2169 }
2171 private Name getName() {
2172 Symbol sym = candidates.head.sym;
2173 return sym.name == names.init ?
2174 sym.owner.name :
2175 sym.name;
2176 }
2178 private class Candidate {
2180 final MethodResolutionPhase step;
2181 final Symbol sym;
2182 final JCDiagnostic details;
2184 private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details) {
2185 this.step = step;
2186 this.sym = sym;
2187 this.details = details;
2188 }
2190 JCDiagnostic getDiagnostic(Type site) {
2191 return diags.fragment("inapplicable.method",
2192 Kinds.kindName(sym),
2193 sym.location(site, types),
2194 sym.asMemberOf(site, types),
2195 details);
2196 }
2198 @Override
2199 public boolean equals(Object o) {
2200 if (o instanceof Candidate) {
2201 Symbol s1 = this.sym;
2202 Symbol s2 = ((Candidate)o).sym;
2203 if ((s1 != s2 &&
2204 (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
2205 (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
2206 ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
2207 return true;
2208 }
2209 return false;
2210 }
2212 boolean isValid() {
2213 return (((sym.flags() & VARARGS) != 0 && step == VARARITY) ||
2214 (sym.flags() & VARARGS) == 0 && step == (boxingEnabled ? BOX : BASIC));
2215 }
2216 }
2217 }
2219 /**
2220 * An InvalidSymbolError error class indicating that a symbol is not
2221 * accessible from a given site
2222 */
2223 class AccessError extends InvalidSymbolError {
2225 private Env<AttrContext> env;
2226 private Type site;
2228 AccessError(Symbol sym) {
2229 this(null, null, sym);
2230 }
2232 AccessError(Env<AttrContext> env, Type site, Symbol sym) {
2233 super(HIDDEN, sym, "access error");
2234 this.env = env;
2235 this.site = site;
2236 if (debugResolve)
2237 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
2238 }
2240 @Override
2241 public boolean exists() {
2242 return false;
2243 }
2245 @Override
2246 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2247 DiagnosticPosition pos,
2248 Symbol location,
2249 Type site,
2250 Name name,
2251 List<Type> argtypes,
2252 List<Type> typeargtypes) {
2253 if (sym.owner.type.tag == ERROR)
2254 return null;
2256 if (sym.name == names.init && sym.owner != site.tsym) {
2257 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
2258 pos, location, site, name, argtypes, typeargtypes);
2259 }
2260 else if ((sym.flags() & PUBLIC) != 0
2261 || (env != null && this.site != null
2262 && !isAccessible(env, this.site))) {
2263 return diags.create(dkind, log.currentSource(),
2264 pos, "not.def.access.class.intf.cant.access",
2265 sym, sym.location());
2266 }
2267 else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
2268 return diags.create(dkind, log.currentSource(),
2269 pos, "report.access", sym,
2270 asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
2271 sym.location());
2272 }
2273 else {
2274 return diags.create(dkind, log.currentSource(),
2275 pos, "not.def.public.cant.access", sym, sym.location());
2276 }
2277 }
2278 }
2280 /**
2281 * InvalidSymbolError error class indicating that an instance member
2282 * has erroneously been accessed from a static context.
2283 */
2284 class StaticError extends InvalidSymbolError {
2286 StaticError(Symbol sym) {
2287 super(STATICERR, sym, "static error");
2288 }
2290 @Override
2291 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2292 DiagnosticPosition pos,
2293 Symbol location,
2294 Type site,
2295 Name name,
2296 List<Type> argtypes,
2297 List<Type> typeargtypes) {
2298 Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
2299 ? types.erasure(sym.type).tsym
2300 : sym);
2301 return diags.create(dkind, log.currentSource(), pos,
2302 "non-static.cant.be.ref", kindName(sym), errSym);
2303 }
2304 }
2306 /**
2307 * InvalidSymbolError error class indicating that a pair of symbols
2308 * (either methods, constructors or operands) are ambiguous
2309 * given an actual arguments/type argument list.
2310 */
2311 class AmbiguityError extends InvalidSymbolError {
2313 /** The other maximally specific symbol */
2314 Symbol sym2;
2316 AmbiguityError(Symbol sym1, Symbol sym2) {
2317 super(AMBIGUOUS, sym1, "ambiguity error");
2318 this.sym2 = sym2;
2319 }
2321 @Override
2322 JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
2323 DiagnosticPosition pos,
2324 Symbol location,
2325 Type site,
2326 Name name,
2327 List<Type> argtypes,
2328 List<Type> typeargtypes) {
2329 AmbiguityError pair = this;
2330 while (true) {
2331 if (pair.sym.kind == AMBIGUOUS)
2332 pair = (AmbiguityError)pair.sym;
2333 else if (pair.sym2.kind == AMBIGUOUS)
2334 pair = (AmbiguityError)pair.sym2;
2335 else break;
2336 }
2337 Name sname = pair.sym.name;
2338 if (sname == names.init) sname = pair.sym.owner.name;
2339 return diags.create(dkind, log.currentSource(),
2340 pos, "ref.ambiguous", sname,
2341 kindName(pair.sym),
2342 pair.sym,
2343 pair.sym.location(site, types),
2344 kindName(pair.sym2),
2345 pair.sym2,
2346 pair.sym2.location(site, types));
2347 }
2348 }
2350 enum MethodResolutionPhase {
2351 BASIC(false, false),
2352 BOX(true, false),
2353 VARARITY(true, true);
2355 boolean isBoxingRequired;
2356 boolean isVarargsRequired;
2358 MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
2359 this.isBoxingRequired = isBoxingRequired;
2360 this.isVarargsRequired = isVarargsRequired;
2361 }
2363 public boolean isBoxingRequired() {
2364 return isBoxingRequired;
2365 }
2367 public boolean isVarargsRequired() {
2368 return isVarargsRequired;
2369 }
2371 public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
2372 return (varargsEnabled || !isVarargsRequired) &&
2373 (boxingEnabled || !isBoxingRequired);
2374 }
2375 }
2377 private Map<MethodResolutionPhase, Symbol> methodResolutionCache =
2378 new HashMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.values().length);
2380 final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
2382 private MethodResolutionPhase currentStep = null;
2384 private MethodResolutionPhase firstErroneousResolutionPhase() {
2385 MethodResolutionPhase bestSoFar = BASIC;
2386 Symbol sym = methodNotFound;
2387 List<MethodResolutionPhase> steps = methodResolutionSteps;
2388 while (steps.nonEmpty() &&
2389 steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
2390 sym.kind >= WRONG_MTHS) {
2391 sym = methodResolutionCache.get(steps.head);
2392 bestSoFar = steps.head;
2393 steps = steps.tail;
2394 }
2395 return bestSoFar;
2396 }
2397 }
