duke@1: /*
mcimadamore@1186:  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. All rights reserved.
duke@1:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@1:  *
duke@1:  * This code is free software; you can redistribute it and/or modify it
duke@1:  * under the terms of the GNU General Public License version 2 only, as
ohair@554:  * published by the Free Software Foundation.  Oracle designates this
duke@1:  * particular file as subject to the "Classpath" exception as provided
ohair@554:  * by Oracle in the LICENSE file that accompanied this code.
duke@1:  *
duke@1:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@1:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@1:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@1:  * version 2 for more details (a copy is included in the LICENSE file that
duke@1:  * accompanied this code).
duke@1:  *
duke@1:  * You should have received a copy of the GNU General Public License version
duke@1:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@1:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@1:  *
ohair@554:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554:  * or visit www.oracle.com if you need additional information or have any
ohair@554:  * questions.
duke@1:  */
duke@1: 
duke@1: package com.sun.tools.javac.comp;
duke@1: 
mcimadamore@1114: import com.sun.tools.javac.api.Formattable.LocalizedString;
duke@1: import com.sun.tools.javac.code.*;
mcimadamore@1114: import com.sun.tools.javac.code.Type.*;
mcimadamore@1114: import com.sun.tools.javac.code.Symbol.*;
mcimadamore@1215: import com.sun.tools.javac.comp.Resolve.MethodResolutionContext.Candidate;
duke@1: import com.sun.tools.javac.jvm.*;
duke@1: import com.sun.tools.javac.tree.*;
mcimadamore@1114: import com.sun.tools.javac.tree.JCTree.*;
mcimadamore@1114: import com.sun.tools.javac.util.*;
mcimadamore@1114: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
mcimadamore@1114: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
mcimadamore@1114: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
duke@1: 
mcimadamore@1114: import java.util.Arrays;
mcimadamore@1114: import java.util.Collection;
mcimadamore@1215: import java.util.EnumMap;
mcimadamore@1114: import java.util.EnumSet;
mcimadamore@1114: import java.util.HashSet;
mcimadamore@1114: import java.util.Map;
mcimadamore@1114: import java.util.Set;
mcimadamore@1114: 
mcimadamore@1114: import javax.lang.model.element.ElementVisitor;
duke@1: 
duke@1: import static com.sun.tools.javac.code.Flags.*;
jjg@1127: import static com.sun.tools.javac.code.Flags.BLOCK;
duke@1: import static com.sun.tools.javac.code.Kinds.*;
jjg@1127: import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
duke@1: import static com.sun.tools.javac.code.TypeTags.*;
mcimadamore@1114: import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
jjg@1127: import static com.sun.tools.javac.tree.JCTree.Tag.*;
mcimadamore@160: 
duke@1: /** Helper class for name resolution, used mostly by the attribution phase.
duke@1:  *
jjg@581:  *  <p><b>This is NOT part of any supported API.
jjg@581:  *  If you write code that depends on this, you do so at your own risk.
duke@1:  *  This code and its internal interfaces are subject to change or
duke@1:  *  deletion without notice.</b>
duke@1:  */
duke@1: public class Resolve {
duke@1:     protected static final Context.Key<Resolve> resolveKey =
duke@1:         new Context.Key<Resolve>();
duke@1: 
jjg@113:     Names names;
duke@1:     Log log;
duke@1:     Symtab syms;
duke@1:     Check chk;
duke@1:     Infer infer;
duke@1:     ClassReader reader;
duke@1:     TreeInfo treeinfo;
duke@1:     Types types;
mcimadamore@89:     JCDiagnostic.Factory diags;
duke@1:     public final boolean boxingEnabled; // = source.allowBoxing();
duke@1:     public final boolean varargsEnabled; // = source.allowVarargs();
mcimadamore@674:     public final boolean allowMethodHandles;
duke@1:     private final boolean debugResolve;
mcimadamore@1114:     final EnumSet<VerboseResolutionMode> verboseResolutionMode;
duke@1: 
mcimadamore@674:     Scope polymorphicSignatureScope;
mcimadamore@674: 
mcimadamore@1215:     protected Resolve(Context context) {
mcimadamore@1215:         context.put(resolveKey, this);
mcimadamore@1215:         syms = Symtab.instance(context);
mcimadamore@1215: 
mcimadamore@1215:         varNotFound = new
mcimadamore@1215:             SymbolNotFoundError(ABSENT_VAR);
mcimadamore@1215:         wrongMethod = new
mcimadamore@1215:             InapplicableSymbolError();
mcimadamore@1215:         wrongMethods = new
mcimadamore@1215:             InapplicableSymbolsError();
mcimadamore@1215:         methodNotFound = new
mcimadamore@1215:             SymbolNotFoundError(ABSENT_MTH);
mcimadamore@1215:         typeNotFound = new
mcimadamore@1215:             SymbolNotFoundError(ABSENT_TYP);
mcimadamore@1215: 
mcimadamore@1215:         names = Names.instance(context);
mcimadamore@1215:         log = Log.instance(context);
mcimadamore@1215:         chk = Check.instance(context);
mcimadamore@1215:         infer = Infer.instance(context);
mcimadamore@1215:         reader = ClassReader.instance(context);
mcimadamore@1215:         treeinfo = TreeInfo.instance(context);
mcimadamore@1215:         types = Types.instance(context);
mcimadamore@1215:         diags = JCDiagnostic.Factory.instance(context);
mcimadamore@1215:         Source source = Source.instance(context);
mcimadamore@1215:         boxingEnabled = source.allowBoxing();
mcimadamore@1215:         varargsEnabled = source.allowVarargs();
mcimadamore@1215:         Options options = Options.instance(context);
mcimadamore@1215:         debugResolve = options.isSet("debugresolve");
mcimadamore@1215:         verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
mcimadamore@1215:         Target target = Target.instance(context);
mcimadamore@1215:         allowMethodHandles = target.hasMethodHandles();
mcimadamore@1215:         polymorphicSignatureScope = new Scope(syms.noSymbol);
mcimadamore@1215: 
mcimadamore@1215:         inapplicableMethodException = new InapplicableMethodException(diags);
mcimadamore@1215:     }
mcimadamore@1215: 
mcimadamore@1215:     /** error symbols, which are returned when resolution fails
mcimadamore@1215:      */
mcimadamore@1215:     private final SymbolNotFoundError varNotFound;
mcimadamore@1215:     private final InapplicableSymbolError wrongMethod;
mcimadamore@1215:     private final InapplicableSymbolsError wrongMethods;
mcimadamore@1215:     private final SymbolNotFoundError methodNotFound;
mcimadamore@1215:     private final SymbolNotFoundError typeNotFound;
mcimadamore@1215: 
mcimadamore@1215:     public static Resolve instance(Context context) {
mcimadamore@1215:         Resolve instance = context.get(resolveKey);
mcimadamore@1215:         if (instance == null)
mcimadamore@1215:             instance = new Resolve(context);
mcimadamore@1215:         return instance;
mcimadamore@1215:     }
mcimadamore@1215: 
mcimadamore@1215:     // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
mcimadamore@1114:     enum VerboseResolutionMode {
mcimadamore@1114:         SUCCESS("success"),
mcimadamore@1114:         FAILURE("failure"),
mcimadamore@1114:         APPLICABLE("applicable"),
mcimadamore@1114:         INAPPLICABLE("inapplicable"),
mcimadamore@1114:         DEFERRED_INST("deferred-inference"),
mcimadamore@1114:         PREDEF("predef"),
mcimadamore@1114:         OBJECT_INIT("object-init"),
mcimadamore@1114:         INTERNAL("internal");
mcimadamore@1114: 
mcimadamore@1114:         String opt;
mcimadamore@1114: 
mcimadamore@1114:         private VerboseResolutionMode(String opt) {
mcimadamore@1114:             this.opt = opt;
mcimadamore@1114:         }
mcimadamore@1114: 
mcimadamore@1114:         static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
mcimadamore@1114:             String s = opts.get("verboseResolution");
mcimadamore@1114:             EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
mcimadamore@1114:             if (s == null) return res;
mcimadamore@1114:             if (s.contains("all")) {
mcimadamore@1114:                 res = EnumSet.allOf(VerboseResolutionMode.class);
mcimadamore@1114:             }
mcimadamore@1114:             Collection<String> args = Arrays.asList(s.split(","));
mcimadamore@1114:             for (VerboseResolutionMode mode : values()) {
mcimadamore@1114:                 if (args.contains(mode.opt)) {
mcimadamore@1114:                     res.add(mode);
mcimadamore@1114:                 } else if (args.contains("-" + mode.opt)) {
mcimadamore@1114:                     res.remove(mode);
mcimadamore@1114:                 }
mcimadamore@1114:             }
mcimadamore@1114:             return res;
mcimadamore@1114:         }
mcimadamore@1114:     }
mcimadamore@1114: 
mcimadamore@1215:     void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
mcimadamore@1215:             List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
mcimadamore@1215:         boolean success = bestSoFar.kind < ERRONEOUS;
mcimadamore@1215: 
mcimadamore@1215:         if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
mcimadamore@1215:             return;
mcimadamore@1215:         } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
mcimadamore@1215:             return;
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         if (bestSoFar.name == names.init &&
mcimadamore@1215:                 bestSoFar.owner == syms.objectType.tsym &&
mcimadamore@1215:                 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
mcimadamore@1215:             return; //skip diags for Object constructor resolution
mcimadamore@1215:         } else if (site == syms.predefClass.type &&
mcimadamore@1215:                 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
mcimadamore@1215:             return; //skip spurious diags for predef symbols (i.e. operators)
mcimadamore@1215:         } else if (currentResolutionContext.internalResolution &&
mcimadamore@1215:                 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
mcimadamore@1215:             return;
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         int pos = 0;
mcimadamore@1215:         int mostSpecificPos = -1;
mcimadamore@1215:         ListBuffer<JCDiagnostic> subDiags = ListBuffer.lb();
mcimadamore@1215:         for (Candidate c : currentResolutionContext.candidates) {
mcimadamore@1215:             if (currentResolutionContext.step != c.step ||
mcimadamore@1215:                     (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
mcimadamore@1215:                     (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
mcimadamore@1215:                 continue;
mcimadamore@1215:             } else {
mcimadamore@1215:                 subDiags.append(c.isApplicable() ?
mcimadamore@1215:                         getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
mcimadamore@1215:                         getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
mcimadamore@1215:                 if (c.sym == bestSoFar)
mcimadamore@1215:                     mostSpecificPos = pos;
mcimadamore@1215:                 pos++;
mcimadamore@1215:             }
mcimadamore@1215:         }
mcimadamore@1215:         String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
mcimadamore@1215:         JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
mcimadamore@1215:                 site.tsym, mostSpecificPos, currentResolutionContext.step,
mcimadamore@1215:                 methodArguments(argtypes), methodArguments(typeargtypes));
mcimadamore@1215:         JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
mcimadamore@1215:         log.report(d);
duke@1:     }
duke@1: 
mcimadamore@1215:     JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
mcimadamore@1215:         JCDiagnostic subDiag = null;
mcimadamore@1215:         if (inst.getReturnType().tag == FORALL) {
mcimadamore@1215:             Type diagType = types.createMethodTypeWithReturn(inst.asMethodType(),
mcimadamore@1215:                                                             ((ForAll)inst.getReturnType()).qtype);
mcimadamore@1215:             subDiag = diags.fragment("partial.inst.sig", diagType);
mcimadamore@1215:         } else if (sym.type.tag == FORALL) {
mcimadamore@1215:             subDiag = diags.fragment("full.inst.sig", inst.asMethodType());
mcimadamore@1215:         }
duke@1: 
mcimadamore@1215:         String key = subDiag == null ?
mcimadamore@1215:                 "applicable.method.found" :
mcimadamore@1215:                 "applicable.method.found.1";
duke@1: 
mcimadamore@1215:         return diags.fragment(key, pos, sym, subDiag);
duke@1:     }
duke@1: 
mcimadamore@1215:     JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
mcimadamore@1215:         return diags.fragment("not.applicable.method.found", pos, sym, subDiag);
mcimadamore@1215:     }
mcimadamore@1215:     // </editor-fold>
duke@1: 
duke@1: /* ************************************************************************
duke@1:  * Identifier resolution
duke@1:  *************************************************************************/
duke@1: 
duke@1:     /** An environment is "static" if its static level is greater than
duke@1:      *  the one of its outer environment
duke@1:      */
duke@1:     static boolean isStatic(Env<AttrContext> env) {
duke@1:         return env.info.staticLevel > env.outer.info.staticLevel;
duke@1:     }
duke@1: 
duke@1:     /** An environment is an "initializer" if it is a constructor or
duke@1:      *  an instance initializer.
duke@1:      */
duke@1:     static boolean isInitializer(Env<AttrContext> env) {
duke@1:         Symbol owner = env.info.scope.owner;
duke@1:         return owner.isConstructor() ||
duke@1:             owner.owner.kind == TYP &&
duke@1:             (owner.kind == VAR ||
duke@1:              owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
duke@1:             (owner.flags() & STATIC) == 0;
duke@1:     }
duke@1: 
duke@1:     /** Is class accessible in given evironment?
duke@1:      *  @param env    The current environment.
duke@1:      *  @param c      The class whose accessibility is checked.
duke@1:      */
duke@1:     public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
mcimadamore@741:         return isAccessible(env, c, false);
mcimadamore@741:     }
mcimadamore@741: 
mcimadamore@741:     public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
mcimadamore@741:         boolean isAccessible = false;
duke@1:         switch ((short)(c.flags() & AccessFlags)) {
mcimadamore@741:             case PRIVATE:
mcimadamore@741:                 isAccessible =
mcimadamore@741:                     env.enclClass.sym.outermostClass() ==
mcimadamore@741:                     c.owner.outermostClass();
mcimadamore@741:                 break;
mcimadamore@741:             case 0:
mcimadamore@741:                 isAccessible =
mcimadamore@741:                     env.toplevel.packge == c.owner // fast special case
mcimadamore@741:                     ||
mcimadamore@741:                     env.toplevel.packge == c.packge()
mcimadamore@741:                     ||
mcimadamore@741:                     // Hack: this case is added since synthesized default constructors
mcimadamore@741:                     // of anonymous classes should be allowed to access
mcimadamore@741:                     // classes which would be inaccessible otherwise.
mcimadamore@741:                     env.enclMethod != null &&
mcimadamore@741:                     (env.enclMethod.mods.flags & ANONCONSTR) != 0;
mcimadamore@741:                 break;
mcimadamore@741:             default: // error recovery
mcimadamore@741:             case PUBLIC:
mcimadamore@741:                 isAccessible = true;
mcimadamore@741:                 break;
mcimadamore@741:             case PROTECTED:
mcimadamore@741:                 isAccessible =
mcimadamore@741:                     env.toplevel.packge == c.owner // fast special case
mcimadamore@741:                     ||
mcimadamore@741:                     env.toplevel.packge == c.packge()
mcimadamore@741:                     ||
mcimadamore@741:                     isInnerSubClass(env.enclClass.sym, c.owner);
mcimadamore@741:                 break;
duke@1:         }
mcimadamore@741:         return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
mcimadamore@741:             isAccessible :
jjg@789:             isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
duke@1:     }
duke@1:     //where
duke@1:         /** Is given class a subclass of given base class, or an inner class
duke@1:          *  of a subclass?
duke@1:          *  Return null if no such class exists.
duke@1:          *  @param c     The class which is the subclass or is contained in it.
duke@1:          *  @param base  The base class
duke@1:          */
duke@1:         private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
duke@1:             while (c != null && !c.isSubClass(base, types)) {
duke@1:                 c = c.owner.enclClass();
duke@1:             }
duke@1:             return c != null;
duke@1:         }
duke@1: 
duke@1:     boolean isAccessible(Env<AttrContext> env, Type t) {
mcimadamore@741:         return isAccessible(env, t, false);
mcimadamore@741:     }
mcimadamore@741: 
mcimadamore@741:     boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
duke@1:         return (t.tag == ARRAY)
duke@1:             ? isAccessible(env, types.elemtype(t))
mcimadamore@741:             : isAccessible(env, t.tsym, checkInner);
duke@1:     }
duke@1: 
duke@1:     /** Is symbol accessible as a member of given type in given evironment?
duke@1:      *  @param env    The current environment.
duke@1:      *  @param site   The type of which the tested symbol is regarded
duke@1:      *                as a member.
duke@1:      *  @param sym    The symbol.
duke@1:      */
duke@1:     public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
mcimadamore@741:         return isAccessible(env, site, sym, false);
mcimadamore@741:     }
mcimadamore@741:     public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
duke@1:         if (sym.name == names.init && sym.owner != site.tsym) return false;
duke@1:         switch ((short)(sym.flags() & AccessFlags)) {
duke@1:         case PRIVATE:
duke@1:             return
duke@1:                 (env.enclClass.sym == sym.owner // fast special case
duke@1:                  ||
duke@1:                  env.enclClass.sym.outermostClass() ==
duke@1:                  sym.owner.outermostClass())
duke@1:                 &&
duke@1:                 sym.isInheritedIn(site.tsym, types);
duke@1:         case 0:
duke@1:             return
duke@1:                 (env.toplevel.packge == sym.owner.owner // fast special case
duke@1:                  ||
duke@1:                  env.toplevel.packge == sym.packge())
duke@1:                 &&
mcimadamore@741:                 isAccessible(env, site, checkInner)
duke@1:                 &&
mcimadamore@254:                 sym.isInheritedIn(site.tsym, types)
mcimadamore@254:                 &&
mcimadamore@254:                 notOverriddenIn(site, sym);
duke@1:         case PROTECTED:
duke@1:             return
duke@1:                 (env.toplevel.packge == sym.owner.owner // fast special case
duke@1:                  ||
duke@1:                  env.toplevel.packge == sym.packge()
duke@1:                  ||
duke@1:                  isProtectedAccessible(sym, env.enclClass.sym, site)
duke@1:                  ||
duke@1:                  // OK to select instance method or field from 'super' or type name
duke@1:                  // (but type names should be disallowed elsewhere!)
duke@1:                  env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
duke@1:                 &&
mcimadamore@741:                 isAccessible(env, site, checkInner)
duke@1:                 &&
mcimadamore@254:                 notOverriddenIn(site, sym);
duke@1:         default: // this case includes erroneous combinations as well
mcimadamore@741:             return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
mcimadamore@254:         }
mcimadamore@254:     }
mcimadamore@254:     //where
mcimadamore@254:     /* `sym' is accessible only if not overridden by
mcimadamore@254:      * another symbol which is a member of `site'
mcimadamore@254:      * (because, if it is overridden, `sym' is not strictly
mcimadamore@674:      * speaking a member of `site'). A polymorphic signature method
mcimadamore@674:      * cannot be overridden (e.g. MH.invokeExact(Object[])).
mcimadamore@254:      */
mcimadamore@254:     private boolean notOverriddenIn(Type site, Symbol sym) {
mcimadamore@254:         if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
mcimadamore@254:             return true;
mcimadamore@254:         else {
mcimadamore@254:             Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
mcimadamore@844:             return (s2 == null || s2 == sym || sym.owner == s2.owner ||
mcimadamore@674:                     s2.isPolymorphicSignatureGeneric() ||
mcimadamore@325:                     !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
duke@1:         }
duke@1:     }
duke@1:     //where
duke@1:         /** Is given protected symbol accessible if it is selected from given site
duke@1:          *  and the selection takes place in given class?
duke@1:          *  @param sym     The symbol with protected access
duke@1:          *  @param c       The class where the access takes place
duke@1:          *  @site          The type of the qualifier
duke@1:          */
duke@1:         private
duke@1:         boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
duke@1:             while (c != null &&
duke@1:                    !(c.isSubClass(sym.owner, types) &&
duke@1:                      (c.flags() & INTERFACE) == 0 &&
duke@1:                      // In JLS 2e 6.6.2.1, the subclass restriction applies
duke@1:                      // only to instance fields and methods -- types are excluded
duke@1:                      // regardless of whether they are declared 'static' or not.
duke@1:                      ((sym.flags() & STATIC) != 0 || sym.kind == TYP || site.tsym.isSubClass(c, types))))
duke@1:                 c = c.owner.enclClass();
duke@1:             return c != null;
duke@1:         }
duke@1: 
duke@1:     /** Try to instantiate the type of a method so that it fits
duke@1:      *  given type arguments and argument types. If succesful, return
duke@1:      *  the method's instantiated type, else return null.
duke@1:      *  The instantiation will take into account an additional leading
duke@1:      *  formal parameter if the method is an instance method seen as a member
duke@1:      *  of un underdetermined site In this case, we treat site as an additional
duke@1:      *  parameter and the parameters of the class containing the method as
duke@1:      *  additional type variables that get instantiated.
duke@1:      *
duke@1:      *  @param env         The current environment
duke@1:      *  @param site        The type of which the method is a member.
duke@1:      *  @param m           The method symbol.
duke@1:      *  @param argtypes    The invocation's given value arguments.
duke@1:      *  @param typeargtypes    The invocation's given type arguments.
duke@1:      *  @param allowBoxing Allow boxing conversions of arguments.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
duke@1:     Type rawInstantiate(Env<AttrContext> env,
duke@1:                         Type site,
duke@1:                         Symbol m,
duke@1:                         List<Type> argtypes,
duke@1:                         List<Type> typeargtypes,
duke@1:                         boolean allowBoxing,
duke@1:                         boolean useVarargs,
duke@1:                         Warner warn)
mcimadamore@299:         throws Infer.InferenceException {
mcimadamore@820:         boolean polymorphicSignature = m.isPolymorphicSignatureGeneric() && allowMethodHandles;
mcimadamore@689:         if (useVarargs && (m.flags() & VARARGS) == 0)
mcimadamore@845:             throw inapplicableMethodException.setMessage();
duke@1:         Type mt = types.memberType(site, m);
duke@1: 
duke@1:         // tvars is the list of formal type variables for which type arguments
duke@1:         // need to inferred.
mcimadamore@950:         List<Type> tvars = null;
mcimadamore@950:         if (env.info.tvars != null) {
mcimadamore@950:             tvars = types.newInstances(env.info.tvars);
mcimadamore@950:             mt = types.subst(mt, env.info.tvars, tvars);
mcimadamore@950:         }
duke@1:         if (typeargtypes == null) typeargtypes = List.nil();
mcimadamore@820:         if (mt.tag != FORALL && typeargtypes.nonEmpty()) {
duke@1:             // This is not a polymorphic method, but typeargs are supplied
jjh@972:             // which is fine, see JLS 15.12.2.1
duke@1:         } else if (mt.tag == FORALL && typeargtypes.nonEmpty()) {
duke@1:             ForAll pmt = (ForAll) mt;
duke@1:             if (typeargtypes.length() != pmt.tvars.length())
mcimadamore@689:                 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
duke@1:             // Check type arguments are within bounds
duke@1:             List<Type> formals = pmt.tvars;
duke@1:             List<Type> actuals = typeargtypes;
duke@1:             while (formals.nonEmpty() && actuals.nonEmpty()) {
duke@1:                 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
duke@1:                                                 pmt.tvars, typeargtypes);
duke@1:                 for (; bounds.nonEmpty(); bounds = bounds.tail)
duke@1:                     if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
mcimadamore@689:                         throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
duke@1:                 formals = formals.tail;
duke@1:                 actuals = actuals.tail;
duke@1:             }
duke@1:             mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
duke@1:         } else if (mt.tag == FORALL) {
duke@1:             ForAll pmt = (ForAll) mt;
duke@1:             List<Type> tvars1 = types.newInstances(pmt.tvars);
duke@1:             tvars = tvars.appendList(tvars1);
duke@1:             mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
duke@1:         }
duke@1: 
duke@1:         // find out whether we need to go the slow route via infer
mcimadamore@674:         boolean instNeeded = tvars.tail != null || /*inlined: tvars.nonEmpty()*/
mcimadamore@674:                 polymorphicSignature;
duke@1:         for (List<Type> l = argtypes;
duke@1:              l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
duke@1:              l = l.tail) {
duke@1:             if (l.head.tag == FORALL) instNeeded = true;
duke@1:         }
duke@1: 
duke@1:         if (instNeeded)
mcimadamore@674:             return polymorphicSignature ?
mcimadamore@820:                 infer.instantiatePolymorphicSignatureInstance(env, site, m.name, (MethodSymbol)m, argtypes) :
mcimadamore@674:                 infer.instantiateMethod(env,
mcimadamore@547:                                     tvars,
duke@1:                                     (MethodType)mt,
mcimadamore@580:                                     m,
duke@1:                                     argtypes,
duke@1:                                     allowBoxing,
duke@1:                                     useVarargs,
duke@1:                                     warn);
mcimadamore@689: 
mcimadamore@845:         checkRawArgumentsAcceptable(env, argtypes, mt.getParameterTypes(),
mcimadamore@689:                                 allowBoxing, useVarargs, warn);
mcimadamore@689:         return mt;
duke@1:     }
duke@1: 
duke@1:     /** Same but returns null instead throwing a NoInstanceException
duke@1:      */
duke@1:     Type instantiate(Env<AttrContext> env,
duke@1:                      Type site,
duke@1:                      Symbol m,
duke@1:                      List<Type> argtypes,
duke@1:                      List<Type> typeargtypes,
duke@1:                      boolean allowBoxing,
duke@1:                      boolean useVarargs,
duke@1:                      Warner warn) {
duke@1:         try {
duke@1:             return rawInstantiate(env, site, m, argtypes, typeargtypes,
duke@1:                                   allowBoxing, useVarargs, warn);
mcimadamore@689:         } catch (InapplicableMethodException ex) {
duke@1:             return null;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Check if a parameter list accepts a list of args.
duke@1:      */
mcimadamore@845:     boolean argumentsAcceptable(Env<AttrContext> env,
mcimadamore@845:                                 List<Type> argtypes,
duke@1:                                 List<Type> formals,
duke@1:                                 boolean allowBoxing,
duke@1:                                 boolean useVarargs,
duke@1:                                 Warner warn) {
mcimadamore@689:         try {
mcimadamore@845:             checkRawArgumentsAcceptable(env, argtypes, formals, allowBoxing, useVarargs, warn);
mcimadamore@689:             return true;
mcimadamore@689:         } catch (InapplicableMethodException ex) {
mcimadamore@689:             return false;
mcimadamore@689:         }
mcimadamore@689:     }
mcimadamore@1186:     /**
mcimadamore@1186:      * A check handler is used by the main method applicability routine in order
mcimadamore@1186:      * to handle specific method applicability failures. It is assumed that a class
mcimadamore@1186:      * implementing this interface should throw exceptions that are a subtype of
mcimadamore@1186:      * InapplicableMethodException (see below). Such exception will terminate the
mcimadamore@1186:      * method applicability check and propagate important info outwards (for the
mcimadamore@1186:      * purpose of generating better diagnostics).
mcimadamore@1186:      */
mcimadamore@1186:     interface MethodCheckHandler {
mcimadamore@1186:         /* The number of actuals and formals differ */
mcimadamore@1186:         InapplicableMethodException arityMismatch();
mcimadamore@1186:         /* An actual argument type does not conform to the corresponding formal type */
mcimadamore@1186:         InapplicableMethodException argumentMismatch(boolean varargs, Type found, Type expected);
mcimadamore@1186:         /* The element type of a varargs is not accessible in the current context */
mcimadamore@1186:         InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected);
mcimadamore@1186:     }
mcimadamore@1186: 
mcimadamore@1186:     /**
mcimadamore@1186:      * Basic method check handler used within Resolve - all methods end up
mcimadamore@1186:      * throwing InapplicableMethodException; a diagnostic fragment that describes
mcimadamore@1186:      * the cause as to why the method is not applicable is set on the exception
mcimadamore@1186:      * before it is thrown.
mcimadamore@1186:      */
mcimadamore@1186:     MethodCheckHandler resolveHandler = new MethodCheckHandler() {
mcimadamore@1186:             public InapplicableMethodException arityMismatch() {
mcimadamore@1186:                 return inapplicableMethodException.setMessage("arg.length.mismatch");
mcimadamore@1186:             }
mcimadamore@1186:             public InapplicableMethodException argumentMismatch(boolean varargs, Type found, Type expected) {
mcimadamore@1186:                 String key = varargs ?
mcimadamore@1186:                         "varargs.argument.mismatch" :
mcimadamore@1186:                         "no.conforming.assignment.exists";
mcimadamore@1186:                 return inapplicableMethodException.setMessage(key,
mcimadamore@1186:                         found, expected);
mcimadamore@1186:             }
mcimadamore@1186:             public InapplicableMethodException inaccessibleVarargs(Symbol location, Type expected) {
mcimadamore@1186:                 return inapplicableMethodException.setMessage("inaccessible.varargs.type",
mcimadamore@1186:                         expected, Kinds.kindName(location), location);
mcimadamore@1186:             }
mcimadamore@1186:     };
mcimadamore@1186: 
mcimadamore@845:     void checkRawArgumentsAcceptable(Env<AttrContext> env,
mcimadamore@845:                                 List<Type> argtypes,
mcimadamore@689:                                 List<Type> formals,
mcimadamore@689:                                 boolean allowBoxing,
mcimadamore@689:                                 boolean useVarargs,
mcimadamore@689:                                 Warner warn) {
mcimadamore@1186:         checkRawArgumentsAcceptable(env, List.<Type>nil(), argtypes, formals,
mcimadamore@1186:                 allowBoxing, useVarargs, warn, resolveHandler);
mcimadamore@1186:     }
mcimadamore@1186: 
mcimadamore@1186:     /**
mcimadamore@1186:      * Main method applicability routine. Given a list of actual types A,
mcimadamore@1186:      * a list of formal types F, determines whether the types in A are
mcimadamore@1186:      * compatible (by method invocation conversion) with the types in F.
mcimadamore@1186:      *
mcimadamore@1186:      * Since this routine is shared between overload resolution and method
mcimadamore@1186:      * type-inference, it is crucial that actual types are converted to the
mcimadamore@1186:      * corresponding 'undet' form (i.e. where inference variables are replaced
mcimadamore@1186:      * with undetvars) so that constraints can be propagated and collected.
mcimadamore@1186:      *
mcimadamore@1186:      * Moreover, if one or more types in A is a poly type, this routine calls
mcimadamore@1186:      * Infer.instantiateArg in order to complete the poly type (this might involve
mcimadamore@1186:      * deferred attribution).
mcimadamore@1186:      *
mcimadamore@1186:      * A method check handler (see above) is used in order to report errors.
mcimadamore@1186:      */
mcimadamore@1186:     List<Type> checkRawArgumentsAcceptable(Env<AttrContext> env,
mcimadamore@1186:                                 List<Type> undetvars,
mcimadamore@1186:                                 List<Type> argtypes,
mcimadamore@1186:                                 List<Type> formals,
mcimadamore@1186:                                 boolean allowBoxing,
mcimadamore@1186:                                 boolean useVarargs,
mcimadamore@1186:                                 Warner warn,
mcimadamore@1186:                                 MethodCheckHandler handler) {
duke@1:         Type varargsFormal = useVarargs ? formals.last() : null;
mcimadamore@1186:         ListBuffer<Type> checkedArgs = ListBuffer.lb();
mcimadamore@1186: 
mcimadamore@689:         if (varargsFormal == null &&
mcimadamore@689:                 argtypes.size() != formals.size()) {
mcimadamore@1186:             throw handler.arityMismatch(); // not enough args
mcimadamore@689:         }
mcimadamore@689: 
duke@1:         while (argtypes.nonEmpty() && formals.head != varargsFormal) {
mcimadamore@1186:             Type undetFormal = infer.asUndetType(formals.head, undetvars);
mcimadamore@1186:             Type capturedActual = types.capture(argtypes.head);
mcimadamore@1186:             boolean works = allowBoxing ?
mcimadamore@1186:                     types.isConvertible(capturedActual, undetFormal, warn) :
mcimadamore@1186:                     types.isSubtypeUnchecked(capturedActual, undetFormal, warn);
mcimadamore@1186:             if (!works) {
mcimadamore@1186:                 throw handler.argumentMismatch(false, argtypes.head, formals.head);
mcimadamore@1186:             }
mcimadamore@1186:             checkedArgs.append(capturedActual);
duke@1:             argtypes = argtypes.tail;
duke@1:             formals = formals.tail;
duke@1:         }
mcimadamore@689: 
mcimadamore@1186:         if (formals.head != varargsFormal) {
mcimadamore@1186:             throw handler.arityMismatch(); // not enough args
mcimadamore@1186:         }
mcimadamore@689: 
mcimadamore@689:         if (useVarargs) {
mcimadamore@1186:             //note: if applicability check is triggered by most specific test,
mcimadamore@1186:             //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
mcimadamore@1006:             Type elt = types.elemtype(varargsFormal);
mcimadamore@1186:             Type eltUndet = infer.asUndetType(elt, undetvars);
mcimadamore@689:             while (argtypes.nonEmpty()) {
mcimadamore@1186:                 Type capturedActual = types.capture(argtypes.head);
mcimadamore@1186:                 if (!types.isConvertible(capturedActual, eltUndet, warn)) {
mcimadamore@1186:                     throw handler.argumentMismatch(true, argtypes.head, elt);
mcimadamore@1186:                 }
mcimadamore@1186:                 checkedArgs.append(capturedActual);
mcimadamore@689:                 argtypes = argtypes.tail;
mcimadamore@689:             }
mcimadamore@845:             //check varargs element type accessibility
mcimadamore@1186:             if (undetvars.isEmpty() && !isAccessible(env, elt)) {
mcimadamore@845:                 Symbol location = env.enclClass.sym;
mcimadamore@1186:                 throw handler.inaccessibleVarargs(location, elt);
mcimadamore@845:             }
duke@1:         }
mcimadamore@1186:         return checkedArgs.toList();
duke@1:     }
mcimadamore@689:     // where
mcimadamore@689:         public static class InapplicableMethodException extends RuntimeException {
mcimadamore@689:             private static final long serialVersionUID = 0;
mcimadamore@689: 
mcimadamore@689:             JCDiagnostic diagnostic;
mcimadamore@689:             JCDiagnostic.Factory diags;
mcimadamore@689: 
mcimadamore@689:             InapplicableMethodException(JCDiagnostic.Factory diags) {
mcimadamore@689:                 this.diagnostic = null;
mcimadamore@689:                 this.diags = diags;
mcimadamore@689:             }
mcimadamore@845:             InapplicableMethodException setMessage() {
mcimadamore@845:                 this.diagnostic = null;
mcimadamore@845:                 return this;
mcimadamore@845:             }
mcimadamore@689:             InapplicableMethodException setMessage(String key) {
mcimadamore@689:                 this.diagnostic = key != null ? diags.fragment(key) : null;
mcimadamore@689:                 return this;
mcimadamore@689:             }
mcimadamore@689:             InapplicableMethodException setMessage(String key, Object... args) {
mcimadamore@689:                 this.diagnostic = key != null ? diags.fragment(key, args) : null;
mcimadamore@689:                 return this;
mcimadamore@689:             }
mcimadamore@845:             InapplicableMethodException setMessage(JCDiagnostic diag) {
mcimadamore@845:                 this.diagnostic = diag;
mcimadamore@845:                 return this;
mcimadamore@845:             }
mcimadamore@689: 
mcimadamore@689:             public JCDiagnostic getDiagnostic() {
mcimadamore@689:                 return diagnostic;
mcimadamore@689:             }
mcimadamore@689:         }
mcimadamore@689:         private final InapplicableMethodException inapplicableMethodException;
duke@1: 
duke@1: /* ***************************************************************************
duke@1:  *  Symbol lookup
duke@1:  *  the following naming conventions for arguments are used
duke@1:  *
duke@1:  *       env      is the environment where the symbol was mentioned
duke@1:  *       site     is the type of which the symbol is a member
duke@1:  *       name     is the symbol's name
duke@1:  *                if no arguments are given
duke@1:  *       argtypes are the value arguments, if we search for a method
duke@1:  *
duke@1:  *  If no symbol was found, a ResolveError detailing the problem is returned.
duke@1:  ****************************************************************************/
duke@1: 
duke@1:     /** Find field. Synthetic fields are always skipped.
duke@1:      *  @param env     The current environment.
duke@1:      *  @param site    The original type from where the selection takes place.
duke@1:      *  @param name    The name of the field.
duke@1:      *  @param c       The class to search for the field. This is always
duke@1:      *                 a superclass or implemented interface of site's class.
duke@1:      */
duke@1:     Symbol findField(Env<AttrContext> env,
duke@1:                      Type site,
duke@1:                      Name name,
duke@1:                      TypeSymbol c) {
mcimadamore@19:         while (c.type.tag == TYPEVAR)
mcimadamore@19:             c = c.type.getUpperBound().tsym;
duke@1:         Symbol bestSoFar = varNotFound;
duke@1:         Symbol sym;
duke@1:         Scope.Entry e = c.members().lookup(name);
duke@1:         while (e.scope != null) {
duke@1:             if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
duke@1:                 return isAccessible(env, site, e.sym)
duke@1:                     ? e.sym : new AccessError(env, site, e.sym);
duke@1:             }
duke@1:             e = e.next();
duke@1:         }
duke@1:         Type st = types.supertype(c.type);
mcimadamore@19:         if (st != null && (st.tag == CLASS || st.tag == TYPEVAR)) {
duke@1:             sym = findField(env, site, name, st.tsym);
duke@1:             if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1:         for (List<Type> l = types.interfaces(c.type);
duke@1:              bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
duke@1:              l = l.tail) {
duke@1:             sym = findField(env, site, name, l.head.tsym);
duke@1:             if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
duke@1:                 sym.owner != bestSoFar.owner)
duke@1:                 bestSoFar = new AmbiguityError(bestSoFar, sym);
duke@1:             else if (sym.kind < bestSoFar.kind)
duke@1:                 bestSoFar = sym;
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Resolve a field identifier, throw a fatal error if not found.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the method invocation.
duke@1:      *  @param site      The type of the qualifying expression, in which
duke@1:      *                   identifier is searched.
duke@1:      *  @param name      The identifier's name.
duke@1:      */
duke@1:     public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                                           Type site, Name name) {
duke@1:         Symbol sym = findField(env, site, name, site.tsym);
duke@1:         if (sym.kind == VAR) return (VarSymbol)sym;
duke@1:         else throw new FatalError(
mcimadamore@89:                  diags.fragment("fatal.err.cant.locate.field",
duke@1:                                 name));
duke@1:     }
duke@1: 
duke@1:     /** Find unqualified variable or field with given name.
duke@1:      *  Synthetic fields always skipped.
duke@1:      *  @param env     The current environment.
duke@1:      *  @param name    The name of the variable or field.
duke@1:      */
duke@1:     Symbol findVar(Env<AttrContext> env, Name name) {
duke@1:         Symbol bestSoFar = varNotFound;
duke@1:         Symbol sym;
duke@1:         Env<AttrContext> env1 = env;
duke@1:         boolean staticOnly = false;
duke@1:         while (env1.outer != null) {
duke@1:             if (isStatic(env1)) staticOnly = true;
duke@1:             Scope.Entry e = env1.info.scope.lookup(name);
duke@1:             while (e.scope != null &&
duke@1:                    (e.sym.kind != VAR ||
duke@1:                     (e.sym.flags_field & SYNTHETIC) != 0))
duke@1:                 e = e.next();
duke@1:             sym = (e.scope != null)
duke@1:                 ? e.sym
duke@1:                 : findField(
duke@1:                     env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
duke@1:             if (sym.exists()) {
duke@1:                 if (staticOnly &&
duke@1:                     sym.kind == VAR &&
duke@1:                     sym.owner.kind == TYP &&
duke@1:                     (sym.flags() & STATIC) == 0)
duke@1:                     return new StaticError(sym);
duke@1:                 else
duke@1:                     return sym;
duke@1:             } else if (sym.kind < bestSoFar.kind) {
duke@1:                 bestSoFar = sym;
duke@1:             }
duke@1: 
duke@1:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
duke@1:             env1 = env1.outer;
duke@1:         }
duke@1: 
duke@1:         sym = findField(env, syms.predefClass.type, name, syms.predefClass);
duke@1:         if (sym.exists())
duke@1:             return sym;
duke@1:         if (bestSoFar.exists())
duke@1:             return bestSoFar;
duke@1: 
duke@1:         Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
duke@1:         for (; e.scope != null; e = e.next()) {
duke@1:             sym = e.sym;
duke@1:             Type origin = e.getOrigin().owner.type;
duke@1:             if (sym.kind == VAR) {
duke@1:                 if (e.sym.owner.type != origin)
duke@1:                     sym = sym.clone(e.getOrigin().owner);
duke@1:                 return isAccessible(env, origin, sym)
duke@1:                     ? sym : new AccessError(env, origin, sym);
duke@1:             }
duke@1:         }
duke@1: 
duke@1:         Symbol origin = null;
duke@1:         e = env.toplevel.starImportScope.lookup(name);
duke@1:         for (; e.scope != null; e = e.next()) {
duke@1:             sym = e.sym;
duke@1:             if (sym.kind != VAR)
duke@1:                 continue;
duke@1:             // invariant: sym.kind == VAR
duke@1:             if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
duke@1:                 return new AmbiguityError(bestSoFar, sym);
duke@1:             else if (bestSoFar.kind >= VAR) {
duke@1:                 origin = e.getOrigin().owner;
duke@1:                 bestSoFar = isAccessible(env, origin.type, sym)
duke@1:                     ? sym : new AccessError(env, origin.type, sym);
duke@1:             }
duke@1:         }
duke@1:         if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
duke@1:             return bestSoFar.clone(origin);
duke@1:         else
duke@1:             return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     Warner noteWarner = new Warner();
duke@1: 
duke@1:     /** Select the best method for a call site among two choices.
duke@1:      *  @param env              The current environment.
duke@1:      *  @param site             The original type from where the
duke@1:      *                          selection takes place.
duke@1:      *  @param argtypes         The invocation's value arguments,
duke@1:      *  @param typeargtypes     The invocation's type arguments,
duke@1:      *  @param sym              Proposed new best match.
duke@1:      *  @param bestSoFar        Previously found best match.
duke@1:      *  @param allowBoxing Allow boxing conversions of arguments.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
mcimadamore@689:     @SuppressWarnings("fallthrough")
duke@1:     Symbol selectBest(Env<AttrContext> env,
duke@1:                       Type site,
duke@1:                       List<Type> argtypes,
duke@1:                       List<Type> typeargtypes,
duke@1:                       Symbol sym,
duke@1:                       Symbol bestSoFar,
duke@1:                       boolean allowBoxing,
duke@1:                       boolean useVarargs,
duke@1:                       boolean operator) {
duke@1:         if (sym.kind == ERR) return bestSoFar;
mcimadamore@171:         if (!sym.isInheritedIn(site.tsym, types)) return bestSoFar;
jjg@816:         Assert.check(sym.kind < AMBIGUOUS);
duke@1:         try {
mcimadamore@1114:             Type mt = rawInstantiate(env, site, sym, argtypes, typeargtypes,
mcimadamore@689:                                allowBoxing, useVarargs, Warner.noWarnings);
mcimadamore@1215:             if (!operator)
mcimadamore@1215:                 currentResolutionContext.addApplicableCandidate(sym, mt);
mcimadamore@689:         } catch (InapplicableMethodException ex) {
mcimadamore@1215:             if (!operator)
mcimadamore@1215:                 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
duke@1:             switch (bestSoFar.kind) {
duke@1:             case ABSENT_MTH:
mcimadamore@1215:                 return wrongMethod;
duke@1:             case WRONG_MTH:
mcimadamore@1110:                 if (operator) return bestSoFar;
mcimadamore@689:             case WRONG_MTHS:
mcimadamore@1215:                 return wrongMethods;
duke@1:             default:
duke@1:                 return bestSoFar;
duke@1:             }
duke@1:         }
duke@1:         if (!isAccessible(env, site, sym)) {
duke@1:             return (bestSoFar.kind == ABSENT_MTH)
duke@1:                 ? new AccessError(env, site, sym)
duke@1:                 : bestSoFar;
mcimadamore@1215:         }
duke@1:         return (bestSoFar.kind > AMBIGUOUS)
duke@1:             ? sym
duke@1:             : mostSpecific(sym, bestSoFar, env, site,
duke@1:                            allowBoxing && operator, useVarargs);
duke@1:     }
duke@1: 
duke@1:     /* Return the most specific of the two methods for a call,
duke@1:      *  given that both are accessible and applicable.
duke@1:      *  @param m1               A new candidate for most specific.
duke@1:      *  @param m2               The previous most specific candidate.
duke@1:      *  @param env              The current environment.
duke@1:      *  @param site             The original type from where the selection
duke@1:      *                          takes place.
duke@1:      *  @param allowBoxing Allow boxing conversions of arguments.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
duke@1:     Symbol mostSpecific(Symbol m1,
duke@1:                         Symbol m2,
duke@1:                         Env<AttrContext> env,
mcimadamore@254:                         final Type site,
duke@1:                         boolean allowBoxing,
duke@1:                         boolean useVarargs) {
duke@1:         switch (m2.kind) {
duke@1:         case MTH:
duke@1:             if (m1 == m2) return m1;
mcimadamore@775:             boolean m1SignatureMoreSpecific = signatureMoreSpecific(env, site, m1, m2, allowBoxing, useVarargs);
mcimadamore@775:             boolean m2SignatureMoreSpecific = signatureMoreSpecific(env, site, m2, m1, allowBoxing, useVarargs);
duke@1:             if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
mcimadamore@775:                 Type mt1 = types.memberType(site, m1);
mcimadamore@775:                 Type mt2 = types.memberType(site, m2);
duke@1:                 if (!types.overrideEquivalent(mt1, mt2))
mcimadamore@844:                     return ambiguityError(m1, m2);
mcimadamore@844: 
duke@1:                 // same signature; select (a) the non-bridge method, or
duke@1:                 // (b) the one that overrides the other, or (c) the concrete
duke@1:                 // one, or (d) merge both abstract signatures
mcimadamore@844:                 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
duke@1:                     return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
mcimadamore@844: 
duke@1:                 // if one overrides or hides the other, use it
duke@1:                 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
duke@1:                 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
duke@1:                 if (types.asSuper(m1Owner.type, m2Owner) != null &&
duke@1:                     ((m1.owner.flags_field & INTERFACE) == 0 ||
duke@1:                      (m2.owner.flags_field & INTERFACE) != 0) &&
duke@1:                     m1.overrides(m2, m1Owner, types, false))
duke@1:                     return m1;
duke@1:                 if (types.asSuper(m2Owner.type, m1Owner) != null &&
duke@1:                     ((m2.owner.flags_field & INTERFACE) == 0 ||
duke@1:                      (m1.owner.flags_field & INTERFACE) != 0) &&
duke@1:                     m2.overrides(m1, m2Owner, types, false))
duke@1:                     return m2;
duke@1:                 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
duke@1:                 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
duke@1:                 if (m1Abstract && !m2Abstract) return m2;
duke@1:                 if (m2Abstract && !m1Abstract) return m1;
duke@1:                 // both abstract or both concrete
duke@1:                 if (!m1Abstract && !m2Abstract)
mcimadamore@844:                     return ambiguityError(m1, m2);
mcimadamore@156:                 // check that both signatures have the same erasure
mcimadamore@156:                 if (!types.isSameTypes(m1.erasure(types).getParameterTypes(),
mcimadamore@156:                                        m2.erasure(types).getParameterTypes()))
mcimadamore@844:                     return ambiguityError(m1, m2);
duke@1:                 // both abstract, neither overridden; merge throws clause and result type
mcimadamore@1059:                 Type mst = mostSpecificReturnType(mt1, mt2);
mcimadamore@1059:                 if (mst == null) {
duke@1:                     // Theoretically, this can't happen, but it is possible
duke@1:                     // due to error recovery or mixing incompatible class files
mcimadamore@844:                     return ambiguityError(m1, m2);
duke@1:                 }
mcimadamore@1059:                 Symbol mostSpecific = mst == mt1 ? m1 : m2;
dlsmith@880:                 List<Type> allThrown = chk.intersect(mt1.getThrownTypes(), mt2.getThrownTypes());
dlsmith@880:                 Type newSig = types.createMethodTypeWithThrown(mostSpecific.type, allThrown);
mcimadamore@254:                 MethodSymbol result = new MethodSymbol(
mcimadamore@254:                         mostSpecific.flags(),
mcimadamore@254:                         mostSpecific.name,
dlsmith@880:                         newSig,
mcimadamore@254:                         mostSpecific.owner) {
mcimadamore@254:                     @Override
mcimadamore@254:                     public MethodSymbol implementation(TypeSymbol origin, Types types, boolean checkResult) {
mcimadamore@254:                         if (origin == site.tsym)
mcimadamore@254:                             return this;
mcimadamore@254:                         else
mcimadamore@254:                             return super.implementation(origin, types, checkResult);
mcimadamore@254:                     }
mcimadamore@254:                 };
duke@1:                 return result;
duke@1:             }
duke@1:             if (m1SignatureMoreSpecific) return m1;
duke@1:             if (m2SignatureMoreSpecific) return m2;
mcimadamore@844:             return ambiguityError(m1, m2);
duke@1:         case AMBIGUOUS:
duke@1:             AmbiguityError e = (AmbiguityError)m2;
mcimadamore@302:             Symbol err1 = mostSpecific(m1, e.sym, env, site, allowBoxing, useVarargs);
duke@1:             Symbol err2 = mostSpecific(m1, e.sym2, env, site, allowBoxing, useVarargs);
duke@1:             if (err1 == err2) return err1;
mcimadamore@302:             if (err1 == e.sym && err2 == e.sym2) return m2;
duke@1:             if (err1 instanceof AmbiguityError &&
duke@1:                 err2 instanceof AmbiguityError &&
mcimadamore@302:                 ((AmbiguityError)err1).sym == ((AmbiguityError)err2).sym)
mcimadamore@844:                 return ambiguityError(m1, m2);
duke@1:             else
mcimadamore@844:                 return ambiguityError(err1, err2);
duke@1:         default:
duke@1:             throw new AssertionError();
duke@1:         }
duke@1:     }
mcimadamore@775:     //where
mcimadamore@775:     private boolean signatureMoreSpecific(Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
mcimadamore@795:         noteWarner.clear();
mcimadamore@775:         Type mtype1 = types.memberType(site, adjustVarargs(m1, m2, useVarargs));
mcimadamore@1006:         Type mtype2 = instantiate(env, site, adjustVarargs(m2, m1, useVarargs),
mcimadamore@1006:                 types.lowerBoundArgtypes(mtype1), null,
mcimadamore@1006:                 allowBoxing, false, noteWarner);
mcimadamore@1006:         return mtype2 != null &&
mcimadamore@795:                 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
mcimadamore@775:     }
mcimadamore@775:     //where
mcimadamore@775:     private Symbol adjustVarargs(Symbol to, Symbol from, boolean useVarargs) {
mcimadamore@775:         List<Type> fromArgs = from.type.getParameterTypes();
mcimadamore@775:         List<Type> toArgs = to.type.getParameterTypes();
mcimadamore@775:         if (useVarargs &&
mcimadamore@775:                 (from.flags() & VARARGS) != 0 &&
mcimadamore@775:                 (to.flags() & VARARGS) != 0) {
mcimadamore@775:             Type varargsTypeFrom = fromArgs.last();
mcimadamore@775:             Type varargsTypeTo = toArgs.last();
mcimadamore@787:             ListBuffer<Type> args = ListBuffer.lb();
mcimadamore@787:             if (toArgs.length() < fromArgs.length()) {
mcimadamore@787:                 //if we are checking a varargs method 'from' against another varargs
mcimadamore@787:                 //method 'to' (where arity of 'to' < arity of 'from') then expand signature
mcimadamore@787:                 //of 'to' to 'fit' arity of 'from' (this means adding fake formals to 'to'
mcimadamore@787:                 //until 'to' signature has the same arity as 'from')
mcimadamore@787:                 while (fromArgs.head != varargsTypeFrom) {
mcimadamore@787:                     args.append(toArgs.head == varargsTypeTo ? types.elemtype(varargsTypeTo) : toArgs.head);
mcimadamore@787:                     fromArgs = fromArgs.tail;
mcimadamore@787:                     toArgs = toArgs.head == varargsTypeTo ?
mcimadamore@787:                         toArgs :
mcimadamore@787:                         toArgs.tail;
mcimadamore@787:                 }
mcimadamore@787:             } else {
mcimadamore@787:                 //formal argument list is same as original list where last
mcimadamore@787:                 //argument (array type) is removed
mcimadamore@787:                 args.appendList(toArgs.reverse().tail.reverse());
mcimadamore@775:             }
mcimadamore@787:             //append varargs element type as last synthetic formal
mcimadamore@787:             args.append(types.elemtype(varargsTypeTo));
dlsmith@880:             Type mtype = types.createMethodTypeWithParameters(to.type, args.toList());
mcimadamore@1006:             return new MethodSymbol(to.flags_field & ~VARARGS, to.name, mtype, to.owner);
mcimadamore@775:         } else {
mcimadamore@775:             return to;
mcimadamore@775:         }
mcimadamore@775:     }
mcimadamore@844:     //where
mcimadamore@1059:     Type mostSpecificReturnType(Type mt1, Type mt2) {
mcimadamore@1059:         Type rt1 = mt1.getReturnType();
mcimadamore@1059:         Type rt2 = mt2.getReturnType();
mcimadamore@1059: 
mcimadamore@1059:         if (mt1.tag == FORALL && mt2.tag == FORALL) {
mcimadamore@1059:             //if both are generic methods, adjust return type ahead of subtyping check
mcimadamore@1059:             rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
mcimadamore@1059:         }
mcimadamore@1059:         //first use subtyping, then return type substitutability
mcimadamore@1059:         if (types.isSubtype(rt1, rt2)) {
mcimadamore@1059:             return mt1;
mcimadamore@1059:         } else if (types.isSubtype(rt2, rt1)) {
mcimadamore@1059:             return mt2;
mcimadamore@1059:         } else if (types.returnTypeSubstitutable(mt1, mt2)) {
mcimadamore@1059:             return mt1;
mcimadamore@1059:         } else if (types.returnTypeSubstitutable(mt2, mt1)) {
mcimadamore@1059:             return mt2;
mcimadamore@1059:         } else {
mcimadamore@1059:             return null;
mcimadamore@1059:         }
mcimadamore@1059:     }
mcimadamore@1059:     //where
mcimadamore@844:     Symbol ambiguityError(Symbol m1, Symbol m2) {
mcimadamore@844:         if (((m1.flags() | m2.flags()) & CLASH) != 0) {
mcimadamore@844:             return (m1.flags() & CLASH) == 0 ? m1 : m2;
mcimadamore@844:         } else {
mcimadamore@844:             return new AmbiguityError(m1, m2);
mcimadamore@844:         }
mcimadamore@844:     }
duke@1: 
duke@1:     /** Find best qualified method matching given name, type and value
duke@1:      *  arguments.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param site      The original type from where the selection
duke@1:      *                   takes place.
duke@1:      *  @param name      The method's name.
duke@1:      *  @param argtypes  The method's value arguments.
duke@1:      *  @param typeargtypes The method's type arguments
duke@1:      *  @param allowBoxing Allow boxing conversions of arguments.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
duke@1:     Symbol findMethod(Env<AttrContext> env,
duke@1:                       Type site,
duke@1:                       Name name,
duke@1:                       List<Type> argtypes,
duke@1:                       List<Type> typeargtypes,
duke@1:                       boolean allowBoxing,
duke@1:                       boolean useVarargs,
duke@1:                       boolean operator) {
jrose@571:         Symbol bestSoFar = methodNotFound;
mcimadamore@1114:         bestSoFar = findMethod(env,
duke@1:                           site,
duke@1:                           name,
duke@1:                           argtypes,
duke@1:                           typeargtypes,
duke@1:                           site.tsym.type,
duke@1:                           true,
jrose@571:                           bestSoFar,
duke@1:                           allowBoxing,
duke@1:                           useVarargs,
mcimadamore@913:                           operator,
mcimadamore@913:                           new HashSet<TypeSymbol>());
mcimadamore@1114:         reportVerboseResolutionDiagnostic(env.tree.pos(), name, site, argtypes, typeargtypes, bestSoFar);
mcimadamore@1114:         return bestSoFar;
duke@1:     }
duke@1:     // where
duke@1:     private Symbol findMethod(Env<AttrContext> env,
duke@1:                               Type site,
duke@1:                               Name name,
duke@1:                               List<Type> argtypes,
duke@1:                               List<Type> typeargtypes,
duke@1:                               Type intype,
duke@1:                               boolean abstractok,
duke@1:                               Symbol bestSoFar,
duke@1:                               boolean allowBoxing,
duke@1:                               boolean useVarargs,
mcimadamore@913:                               boolean operator,
mcimadamore@913:                               Set<TypeSymbol> seen) {
mcimadamore@19:         for (Type ct = intype; ct.tag == CLASS || ct.tag == TYPEVAR; ct = types.supertype(ct)) {
mcimadamore@19:             while (ct.tag == TYPEVAR)
mcimadamore@19:                 ct = ct.getUpperBound();
duke@1:             ClassSymbol c = (ClassSymbol)ct.tsym;
mcimadamore@913:             if (!seen.add(c)) return bestSoFar;
mcimadamore@135:             if ((c.flags() & (ABSTRACT | INTERFACE | ENUM)) == 0)
duke@1:                 abstractok = false;
duke@1:             for (Scope.Entry e = c.members().lookup(name);
duke@1:                  e.scope != null;
duke@1:                  e = e.next()) {
duke@1:                 //- System.out.println(" e " + e.sym);
duke@1:                 if (e.sym.kind == MTH &&
duke@1:                     (e.sym.flags_field & SYNTHETIC) == 0) {
duke@1:                     bestSoFar = selectBest(env, site, argtypes, typeargtypes,
duke@1:                                            e.sym, bestSoFar,
duke@1:                                            allowBoxing,
duke@1:                                            useVarargs,
duke@1:                                            operator);
duke@1:                 }
duke@1:             }
mcimadamore@537:             if (name == names.init)
mcimadamore@537:                 break;
duke@1:             //- System.out.println(" - " + bestSoFar);
duke@1:             if (abstractok) {
duke@1:                 Symbol concrete = methodNotFound;
duke@1:                 if ((bestSoFar.flags() & ABSTRACT) == 0)
duke@1:                     concrete = bestSoFar;
duke@1:                 for (List<Type> l = types.interfaces(c.type);
duke@1:                      l.nonEmpty();
duke@1:                      l = l.tail) {
duke@1:                     bestSoFar = findMethod(env, site, name, argtypes,
duke@1:                                            typeargtypes,
duke@1:                                            l.head, abstractok, bestSoFar,
mcimadamore@913:                                            allowBoxing, useVarargs, operator, seen);
duke@1:                 }
duke@1:                 if (concrete != bestSoFar &&
duke@1:                     concrete.kind < ERR  && bestSoFar.kind < ERR &&
duke@1:                     types.isSubSignature(concrete.type, bestSoFar.type))
duke@1:                     bestSoFar = concrete;
duke@1:             }
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find unqualified method matching given name, type and value arguments.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param name      The method's name.
duke@1:      *  @param argtypes  The method's value arguments.
duke@1:      *  @param typeargtypes  The method's type arguments.
duke@1:      *  @param allowBoxing Allow boxing conversions of arguments.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
duke@1:     Symbol findFun(Env<AttrContext> env, Name name,
duke@1:                    List<Type> argtypes, List<Type> typeargtypes,
duke@1:                    boolean allowBoxing, boolean useVarargs) {
duke@1:         Symbol bestSoFar = methodNotFound;
duke@1:         Symbol sym;
duke@1:         Env<AttrContext> env1 = env;
duke@1:         boolean staticOnly = false;
duke@1:         while (env1.outer != null) {
duke@1:             if (isStatic(env1)) staticOnly = true;
duke@1:             sym = findMethod(
duke@1:                 env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
duke@1:                 allowBoxing, useVarargs, false);
duke@1:             if (sym.exists()) {
duke@1:                 if (staticOnly &&
duke@1:                     sym.kind == MTH &&
duke@1:                     sym.owner.kind == TYP &&
duke@1:                     (sym.flags() & STATIC) == 0) return new StaticError(sym);
duke@1:                 else return sym;
duke@1:             } else if (sym.kind < bestSoFar.kind) {
duke@1:                 bestSoFar = sym;
duke@1:             }
duke@1:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
duke@1:             env1 = env1.outer;
duke@1:         }
duke@1: 
duke@1:         sym = findMethod(env, syms.predefClass.type, name, argtypes,
duke@1:                          typeargtypes, allowBoxing, useVarargs, false);
duke@1:         if (sym.exists())
duke@1:             return sym;
duke@1: 
duke@1:         Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
duke@1:         for (; e.scope != null; e = e.next()) {
duke@1:             sym = e.sym;
duke@1:             Type origin = e.getOrigin().owner.type;
duke@1:             if (sym.kind == MTH) {
duke@1:                 if (e.sym.owner.type != origin)
duke@1:                     sym = sym.clone(e.getOrigin().owner);
duke@1:                 if (!isAccessible(env, origin, sym))
duke@1:                     sym = new AccessError(env, origin, sym);
duke@1:                 bestSoFar = selectBest(env, origin,
duke@1:                                        argtypes, typeargtypes,
duke@1:                                        sym, bestSoFar,
duke@1:                                        allowBoxing, useVarargs, false);
duke@1:             }
duke@1:         }
duke@1:         if (bestSoFar.exists())
duke@1:             return bestSoFar;
duke@1: 
duke@1:         e = env.toplevel.starImportScope.lookup(name);
duke@1:         for (; e.scope != null; e = e.next()) {
duke@1:             sym = e.sym;
duke@1:             Type origin = e.getOrigin().owner.type;
duke@1:             if (sym.kind == MTH) {
duke@1:                 if (e.sym.owner.type != origin)
duke@1:                     sym = sym.clone(e.getOrigin().owner);
duke@1:                 if (!isAccessible(env, origin, sym))
duke@1:                     sym = new AccessError(env, origin, sym);
duke@1:                 bestSoFar = selectBest(env, origin,
duke@1:                                        argtypes, typeargtypes,
duke@1:                                        sym, bestSoFar,
duke@1:                                        allowBoxing, useVarargs, false);
duke@1:             }
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Load toplevel or member class with given fully qualified name and
duke@1:      *  verify that it is accessible.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param name      The fully qualified name of the class to be loaded.
duke@1:      */
duke@1:     Symbol loadClass(Env<AttrContext> env, Name name) {
duke@1:         try {
duke@1:             ClassSymbol c = reader.loadClass(name);
duke@1:             return isAccessible(env, c) ? c : new AccessError(c);
duke@1:         } catch (ClassReader.BadClassFile err) {
duke@1:             throw err;
duke@1:         } catch (CompletionFailure ex) {
duke@1:             return typeNotFound;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     /** Find qualified member type.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param site      The original type from where the selection takes
duke@1:      *                   place.
duke@1:      *  @param name      The type's name.
duke@1:      *  @param c         The class to search for the member type. This is
duke@1:      *                   always a superclass or implemented interface of
duke@1:      *                   site's class.
duke@1:      */
duke@1:     Symbol findMemberType(Env<AttrContext> env,
duke@1:                           Type site,
duke@1:                           Name name,
duke@1:                           TypeSymbol c) {
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         Symbol sym;
duke@1:         Scope.Entry e = c.members().lookup(name);
duke@1:         while (e.scope != null) {
duke@1:             if (e.sym.kind == TYP) {
duke@1:                 return isAccessible(env, site, e.sym)
duke@1:                     ? e.sym
duke@1:                     : new AccessError(env, site, e.sym);
duke@1:             }
duke@1:             e = e.next();
duke@1:         }
duke@1:         Type st = types.supertype(c.type);
duke@1:         if (st != null && st.tag == CLASS) {
duke@1:             sym = findMemberType(env, site, name, st.tsym);
duke@1:             if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1:         for (List<Type> l = types.interfaces(c.type);
duke@1:              bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
duke@1:              l = l.tail) {
duke@1:             sym = findMemberType(env, site, name, l.head.tsym);
duke@1:             if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
duke@1:                 sym.owner != bestSoFar.owner)
duke@1:                 bestSoFar = new AmbiguityError(bestSoFar, sym);
duke@1:             else if (sym.kind < bestSoFar.kind)
duke@1:                 bestSoFar = sym;
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find a global type in given scope and load corresponding class.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param scope     The scope in which to look for the type.
duke@1:      *  @param name      The type's name.
duke@1:      */
duke@1:     Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
duke@1:             Symbol sym = loadClass(env, e.sym.flatName());
duke@1:             if (bestSoFar.kind == TYP && sym.kind == TYP &&
duke@1:                 bestSoFar != sym)
duke@1:                 return new AmbiguityError(bestSoFar, sym);
duke@1:             else if (sym.kind < bestSoFar.kind)
duke@1:                 bestSoFar = sym;
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find an unqualified type symbol.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param name      The type's name.
duke@1:      */
duke@1:     Symbol findType(Env<AttrContext> env, Name name) {
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         Symbol sym;
duke@1:         boolean staticOnly = false;
duke@1:         for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
duke@1:             if (isStatic(env1)) staticOnly = true;
duke@1:             for (Scope.Entry e = env1.info.scope.lookup(name);
duke@1:                  e.scope != null;
duke@1:                  e = e.next()) {
duke@1:                 if (e.sym.kind == TYP) {
duke@1:                     if (staticOnly &&
duke@1:                         e.sym.type.tag == TYPEVAR &&
duke@1:                         e.sym.owner.kind == TYP) return new StaticError(e.sym);
duke@1:                     return e.sym;
duke@1:                 }
duke@1:             }
duke@1: 
duke@1:             sym = findMemberType(env1, env1.enclClass.sym.type, name,
duke@1:                                  env1.enclClass.sym);
duke@1:             if (staticOnly && sym.kind == TYP &&
duke@1:                 sym.type.tag == CLASS &&
duke@1:                 sym.type.getEnclosingType().tag == CLASS &&
duke@1:                 env1.enclClass.sym.type.isParameterized() &&
duke@1:                 sym.type.getEnclosingType().isParameterized())
duke@1:                 return new StaticError(sym);
duke@1:             else if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1: 
duke@1:             JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
duke@1:             if ((encl.sym.flags() & STATIC) != 0)
duke@1:                 staticOnly = true;
duke@1:         }
duke@1: 
jjg@1127:         if (!env.tree.hasTag(IMPORT)) {
duke@1:             sym = findGlobalType(env, env.toplevel.namedImportScope, name);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1: 
duke@1:             sym = findGlobalType(env, env.toplevel.packge.members(), name);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1: 
duke@1:             sym = findGlobalType(env, env.toplevel.starImportScope, name);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1: 
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find an unqualified identifier which matches a specified kind set.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param name      The indentifier's name.
duke@1:      *  @param kind      Indicates the possible symbol kinds
duke@1:      *                   (a subset of VAL, TYP, PCK).
duke@1:      */
duke@1:     Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         Symbol sym;
duke@1: 
duke@1:         if ((kind & VAR) != 0) {
duke@1:             sym = findVar(env, name);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1: 
duke@1:         if ((kind & TYP) != 0) {
duke@1:             sym = findType(env, name);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1: 
duke@1:         if ((kind & PCK) != 0) return reader.enterPackage(name);
duke@1:         else return bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find an identifier in a package which matches a specified kind set.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param kind      Indicates the possible symbol kinds
duke@1:      *                   (a nonempty subset of TYP, PCK).
duke@1:      */
duke@1:     Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
duke@1:                               Name name, int kind) {
duke@1:         Name fullname = TypeSymbol.formFullName(name, pck);
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         PackageSymbol pack = null;
duke@1:         if ((kind & PCK) != 0) {
duke@1:             pack = reader.enterPackage(fullname);
duke@1:             if (pack.exists()) return pack;
duke@1:         }
duke@1:         if ((kind & TYP) != 0) {
duke@1:             Symbol sym = loadClass(env, fullname);
duke@1:             if (sym.exists()) {
duke@1:                 // don't allow programs to use flatnames
duke@1:                 if (name == sym.name) return sym;
duke@1:             }
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1:         return (pack != null) ? pack : bestSoFar;
duke@1:     }
duke@1: 
duke@1:     /** Find an identifier among the members of a given type `site'.
duke@1:      *  @param env       The current environment.
duke@1:      *  @param site      The type containing the symbol to be found.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param kind      Indicates the possible symbol kinds
duke@1:      *                   (a subset of VAL, TYP).
duke@1:      */
duke@1:     Symbol findIdentInType(Env<AttrContext> env, Type site,
duke@1:                            Name name, int kind) {
duke@1:         Symbol bestSoFar = typeNotFound;
duke@1:         Symbol sym;
duke@1:         if ((kind & VAR) != 0) {
duke@1:             sym = findField(env, site, name, site.tsym);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1: 
duke@1:         if ((kind & TYP) != 0) {
duke@1:             sym = findMemberType(env, site, name, site.tsym);
duke@1:             if (sym.exists()) return sym;
duke@1:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
duke@1: /* ***************************************************************************
duke@1:  *  Access checking
duke@1:  *  The following methods convert ResolveErrors to ErrorSymbols, issuing
duke@1:  *  an error message in the process
duke@1:  ****************************************************************************/
duke@1: 
duke@1:     /** If `sym' is a bad symbol: report error and return errSymbol
duke@1:      *  else pass through unchanged,
duke@1:      *  additional arguments duplicate what has been used in trying to find the
duke@1:      *  symbol (--> flyweight pattern). This improves performance since we
duke@1:      *  expect misses to happen frequently.
duke@1:      *
duke@1:      *  @param sym       The symbol that was found, or a ResolveError.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param site      The original type from where the selection took place.
duke@1:      *  @param name      The symbol's name.
duke@1:      *  @param argtypes  The invocation's value arguments,
duke@1:      *                   if we looked for a method.
duke@1:      *  @param typeargtypes  The invocation's type arguments,
duke@1:      *                   if we looked for a method.
duke@1:      */
duke@1:     Symbol access(Symbol sym,
duke@1:                   DiagnosticPosition pos,
mcimadamore@829:                   Symbol location,
duke@1:                   Type site,
duke@1:                   Name name,
duke@1:                   boolean qualified,
duke@1:                   List<Type> argtypes,
duke@1:                   List<Type> typeargtypes) {
duke@1:         if (sym.kind >= AMBIGUOUS) {
mcimadamore@302:             ResolveError errSym = (ResolveError)sym;
duke@1:             if (!site.isErroneous() &&
duke@1:                 !Type.isErroneous(argtypes) &&
duke@1:                 (typeargtypes==null || !Type.isErroneous(typeargtypes)))
mcimadamore@829:                 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
mcimadamore@302:             sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
duke@1:         }
duke@1:         return sym;
duke@1:     }
duke@1: 
mcimadamore@829:     /** Same as original access(), but without location.
mcimadamore@829:      */
mcimadamore@829:     Symbol access(Symbol sym,
mcimadamore@829:                   DiagnosticPosition pos,
mcimadamore@829:                   Type site,
mcimadamore@829:                   Name name,
mcimadamore@829:                   boolean qualified,
mcimadamore@829:                   List<Type> argtypes,
mcimadamore@829:                   List<Type> typeargtypes) {
mcimadamore@829:         return access(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
mcimadamore@829:     }
mcimadamore@829: 
mcimadamore@829:     /** Same as original access(), but without type arguments and arguments.
mcimadamore@829:      */
mcimadamore@829:     Symbol access(Symbol sym,
mcimadamore@829:                   DiagnosticPosition pos,
mcimadamore@829:                   Symbol location,
mcimadamore@829:                   Type site,
mcimadamore@829:                   Name name,
mcimadamore@829:                   boolean qualified) {
mcimadamore@829:         if (sym.kind >= AMBIGUOUS)
mcimadamore@829:             return access(sym, pos, location, site, name, qualified, List.<Type>nil(), null);
mcimadamore@829:         else
mcimadamore@829:             return sym;
mcimadamore@829:     }
mcimadamore@829: 
mcimadamore@829:     /** Same as original access(), but without location, type arguments and arguments.
duke@1:      */
duke@1:     Symbol access(Symbol sym,
duke@1:                   DiagnosticPosition pos,
duke@1:                   Type site,
duke@1:                   Name name,
duke@1:                   boolean qualified) {
mcimadamore@829:         return access(sym, pos, site.tsym, site, name, qualified);
duke@1:     }
duke@1: 
duke@1:     /** Check that sym is not an abstract method.
duke@1:      */
duke@1:     void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
duke@1:         if ((sym.flags() & ABSTRACT) != 0)
duke@1:             log.error(pos, "abstract.cant.be.accessed.directly",
duke@1:                       kindName(sym), sym, sym.location());
duke@1:     }
duke@1: 
duke@1: /* ***************************************************************************
duke@1:  *  Debugging
duke@1:  ****************************************************************************/
duke@1: 
duke@1:     /** print all scopes starting with scope s and proceeding outwards.
duke@1:      *  used for debugging.
duke@1:      */
duke@1:     public void printscopes(Scope s) {
duke@1:         while (s != null) {
duke@1:             if (s.owner != null)
duke@1:                 System.err.print(s.owner + ": ");
duke@1:             for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
duke@1:                 if ((e.sym.flags() & ABSTRACT) != 0)
duke@1:                     System.err.print("abstract ");
duke@1:                 System.err.print(e.sym + " ");
duke@1:             }
duke@1:             System.err.println();
duke@1:             s = s.next;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     void printscopes(Env<AttrContext> env) {
duke@1:         while (env.outer != null) {
duke@1:             System.err.println("------------------------------");
duke@1:             printscopes(env.info.scope);
duke@1:             env = env.outer;
duke@1:         }
duke@1:     }
duke@1: 
duke@1:     public void printscopes(Type t) {
duke@1:         while (t.tag == CLASS) {
duke@1:             printscopes(t.tsym.members());
duke@1:             t = types.supertype(t);
duke@1:         }
duke@1:     }
duke@1: 
duke@1: /* ***************************************************************************
duke@1:  *  Name resolution
duke@1:  *  Naming conventions are as for symbol lookup
duke@1:  *  Unlike the find... methods these methods will report access errors
duke@1:  ****************************************************************************/
duke@1: 
duke@1:     /** Resolve an unqualified (non-method) identifier.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the identifier use.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param kind      The set of admissible symbol kinds for the identifier.
duke@1:      */
duke@1:     Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                         Name name, int kind) {
duke@1:         return access(
duke@1:             findIdent(env, name, kind),
duke@1:             pos, env.enclClass.sym.type, name, false);
duke@1:     }
duke@1: 
duke@1:     /** Resolve an unqualified method identifier.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the method invocation.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param argtypes  The types of the invocation's value arguments.
duke@1:      *  @param typeargtypes  The types of the invocation's type arguments.
duke@1:      */
duke@1:     Symbol resolveMethod(DiagnosticPosition pos,
duke@1:                          Env<AttrContext> env,
duke@1:                          Name name,
duke@1:                          List<Type> argtypes,
duke@1:                          List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1215:             Symbol sym = methodNotFound;
mcimadamore@1215:             List<MethodResolutionPhase> steps = methodResolutionSteps;
mcimadamore@1215:             while (steps.nonEmpty() &&
mcimadamore@1215:                    steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
mcimadamore@1215:                    sym.kind >= ERRONEOUS) {
mcimadamore@1215:                 currentResolutionContext.step = steps.head;
mcimadamore@1215:                 sym = findFun(env, name, argtypes, typeargtypes,
mcimadamore@1215:                         steps.head.isBoxingRequired,
mcimadamore@1215:                         env.info.varArgs = steps.head.isVarargsRequired);
mcimadamore@1215:                 currentResolutionContext.resolutionCache.put(steps.head, sym);
mcimadamore@1215:                 steps = steps.tail;
mcimadamore@1215:             }
mcimadamore@1215:             if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
mcimadamore@1215:                 MethodResolutionPhase errPhase =
mcimadamore@1215:                         currentResolutionContext.firstErroneousResolutionPhase();
mcimadamore@1215:                 sym = access(currentResolutionContext.resolutionCache.get(errPhase),
mcimadamore@1215:                         pos, env.enclClass.sym.type, name, false, argtypes, typeargtypes);
mcimadamore@1215:                 env.info.varArgs = errPhase.isVarargsRequired;
mcimadamore@1215:             }
mcimadamore@1215:             return sym;
duke@1:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
duke@1:         }
mcimadamore@689:     }
mcimadamore@689: 
duke@1:     /** Resolve a qualified method identifier
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the method invocation.
duke@1:      *  @param site      The type of the qualifying expression, in which
duke@1:      *                   identifier is searched.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param argtypes  The types of the invocation's value arguments.
duke@1:      *  @param typeargtypes  The types of the invocation's type arguments.
duke@1:      */
duke@1:     Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                                   Type site, Name name, List<Type> argtypes,
duke@1:                                   List<Type> typeargtypes) {
mcimadamore@829:         return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
mcimadamore@829:     }
mcimadamore@829:     Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
mcimadamore@829:                                   Symbol location, Type site, Name name, List<Type> argtypes,
mcimadamore@829:                                   List<Type> typeargtypes) {
mcimadamore@1215:         return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
mcimadamore@1215:     }
mcimadamore@1215:     private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
mcimadamore@1215:                                   DiagnosticPosition pos, Env<AttrContext> env,
mcimadamore@1215:                                   Symbol location, Type site, Name name, List<Type> argtypes,
mcimadamore@1215:                                   List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = resolveContext;
mcimadamore@1215:             Symbol sym = methodNotFound;
mcimadamore@1215:             List<MethodResolutionPhase> steps = methodResolutionSteps;
mcimadamore@1215:             while (steps.nonEmpty() &&
mcimadamore@1215:                    steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
mcimadamore@1215:                    sym.kind >= ERRONEOUS) {
mcimadamore@1215:                 currentResolutionContext.step = steps.head;
mcimadamore@1215:                 sym = findMethod(env, site, name, argtypes, typeargtypes,
mcimadamore@1215:                         steps.head.isBoxingRequired(),
mcimadamore@1215:                         env.info.varArgs = steps.head.isVarargsRequired(), false);
mcimadamore@1215:                 currentResolutionContext.resolutionCache.put(steps.head, sym);
mcimadamore@1215:                 steps = steps.tail;
mcimadamore@1215:             }
mcimadamore@1215:             if (sym.kind >= AMBIGUOUS) {
mcimadamore@1215:                 if (site.tsym.isPolymorphicSignatureGeneric()) {
mcimadamore@1215:                     //polymorphic receiver - synthesize new method symbol
mcimadamore@1215:                     env.info.varArgs = false;
mcimadamore@1215:                     sym = findPolymorphicSignatureInstance(env,
mcimadamore@1215:                             site, name, null, argtypes);
mcimadamore@1215:                 }
mcimadamore@1215:                 else {
mcimadamore@1215:                     //if nothing is found return the 'first' error
mcimadamore@1215:                     MethodResolutionPhase errPhase =
mcimadamore@1215:                             currentResolutionContext.firstErroneousResolutionPhase();
mcimadamore@1215:                     sym = access(currentResolutionContext.resolutionCache.get(errPhase),
mcimadamore@1215:                             pos, location, site, name, true, argtypes, typeargtypes);
mcimadamore@1215:                     env.info.varArgs = errPhase.isVarargsRequired;
mcimadamore@1215:                 }
mcimadamore@1215:             } else if (allowMethodHandles && sym.isPolymorphicSignatureGeneric()) {
mcimadamore@1215:                 //non-instantiated polymorphic signature - synthesize new method symbol
mcimadamore@674:                 env.info.varArgs = false;
mcimadamore@674:                 sym = findPolymorphicSignatureInstance(env,
mcimadamore@1215:                         site, name, (MethodSymbol)sym, argtypes);
mcimadamore@674:             }
mcimadamore@1215:             return sym;
duke@1:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
mcimadamore@1215:         }
duke@1:     }
duke@1: 
mcimadamore@674:     /** Find or create an implicit method of exactly the given type (after erasure).
mcimadamore@674:      *  Searches in a side table, not the main scope of the site.
mcimadamore@674:      *  This emulates the lookup process required by JSR 292 in JVM.
mcimadamore@674:      *  @param env       Attribution environment
mcimadamore@674:      *  @param site      The original type from where the selection takes place.
mcimadamore@674:      *  @param name      The method's name.
mcimadamore@674:      *  @param spMethod  A template for the implicit method, or null.
mcimadamore@674:      *  @param argtypes  The required argument types.
mcimadamore@674:      *  @param typeargtypes  The required type arguments.
mcimadamore@674:      */
mcimadamore@674:     Symbol findPolymorphicSignatureInstance(Env<AttrContext> env, Type site,
mcimadamore@674:                                             Name name,
mcimadamore@674:                                             MethodSymbol spMethod,  // sig. poly. method or null if none
mcimadamore@820:                                             List<Type> argtypes) {
mcimadamore@674:         Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
mcimadamore@820:                 site, name, spMethod, argtypes);
mcimadamore@674:         long flags = ABSTRACT | HYPOTHETICAL | POLYMORPHIC_SIGNATURE |
mcimadamore@674:                     (spMethod != null ?
mcimadamore@674:                         spMethod.flags() & Flags.AccessFlags :
mcimadamore@674:                         Flags.PUBLIC | Flags.STATIC);
mcimadamore@674:         Symbol m = null;
mcimadamore@674:         for (Scope.Entry e = polymorphicSignatureScope.lookup(name);
mcimadamore@674:              e.scope != null;
mcimadamore@674:              e = e.next()) {
mcimadamore@674:             Symbol sym = e.sym;
mcimadamore@674:             if (types.isSameType(mtype, sym.type) &&
mcimadamore@674:                 (sym.flags() & Flags.STATIC) == (flags & Flags.STATIC) &&
mcimadamore@674:                 types.isSameType(sym.owner.type, site)) {
mcimadamore@674:                m = sym;
mcimadamore@674:                break;
mcimadamore@674:             }
mcimadamore@674:         }
mcimadamore@674:         if (m == null) {
mcimadamore@674:             // create the desired method
mcimadamore@674:             m = new MethodSymbol(flags, name, mtype, site.tsym);
mcimadamore@674:             polymorphicSignatureScope.enter(m);
mcimadamore@674:         }
mcimadamore@674:         return m;
mcimadamore@674:     }
mcimadamore@674: 
duke@1:     /** Resolve a qualified method identifier, throw a fatal error if not
duke@1:      *  found.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the method invocation.
duke@1:      *  @param site      The type of the qualifying expression, in which
duke@1:      *                   identifier is searched.
duke@1:      *  @param name      The identifier's name.
duke@1:      *  @param argtypes  The types of the invocation's value arguments.
duke@1:      *  @param typeargtypes  The types of the invocation's type arguments.
duke@1:      */
duke@1:     public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                                         Type site, Name name,
duke@1:                                         List<Type> argtypes,
duke@1:                                         List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext resolveContext = new MethodResolutionContext();
mcimadamore@1215:         resolveContext.internalResolution = true;
mcimadamore@1215:         Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
mcimadamore@1215:                 site, name, argtypes, typeargtypes);
mcimadamore@1215:         if (sym.kind == MTH) return (MethodSymbol)sym;
mcimadamore@1215:         else throw new FatalError(
mcimadamore@1215:                  diags.fragment("fatal.err.cant.locate.meth",
mcimadamore@1215:                                 name));
duke@1:     }
duke@1: 
duke@1:     /** Resolve constructor.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the constructor invocation.
duke@1:      *  @param site      The type of class for which a constructor is searched.
duke@1:      *  @param argtypes  The types of the constructor invocation's value
duke@1:      *                   arguments.
duke@1:      *  @param typeargtypes  The types of the constructor invocation's type
duke@1:      *                   arguments.
duke@1:      */
duke@1:     Symbol resolveConstructor(DiagnosticPosition pos,
duke@1:                               Env<AttrContext> env,
duke@1:                               Type site,
duke@1:                               List<Type> argtypes,
duke@1:                               List<Type> typeargtypes) {
mcimadamore@1215:         return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
mcimadamore@1215:     }
mcimadamore@1215:     private Symbol resolveConstructor(MethodResolutionContext resolveContext,
mcimadamore@1215:                               DiagnosticPosition pos,
mcimadamore@1215:                               Env<AttrContext> env,
mcimadamore@1215:                               Type site,
mcimadamore@1215:                               List<Type> argtypes,
mcimadamore@1215:                               List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = resolveContext;
mcimadamore@1215:             Symbol sym = methodNotFound;
mcimadamore@1215:             List<MethodResolutionPhase> steps = methodResolutionSteps;
mcimadamore@1215:             while (steps.nonEmpty() &&
mcimadamore@1215:                    steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
mcimadamore@1215:                    sym.kind >= ERRONEOUS) {
mcimadamore@1215:                 currentResolutionContext.step = steps.head;
mcimadamore@1215:                 sym = findConstructor(pos, env, site, argtypes, typeargtypes,
mcimadamore@1215:                         steps.head.isBoxingRequired(),
mcimadamore@1215:                         env.info.varArgs = steps.head.isVarargsRequired());
mcimadamore@1215:                 currentResolutionContext.resolutionCache.put(steps.head, sym);
mcimadamore@1215:                 steps = steps.tail;
mcimadamore@1215:             }
mcimadamore@1215:             if (sym.kind >= AMBIGUOUS) {//if nothing is found return the 'first' error
mcimadamore@1215:                 MethodResolutionPhase errPhase = currentResolutionContext.firstErroneousResolutionPhase();
mcimadamore@1215:                 sym = access(currentResolutionContext.resolutionCache.get(errPhase),
mcimadamore@1215:                         pos, site, names.init, true, argtypes, typeargtypes);
mcimadamore@1215:                 env.info.varArgs = errPhase.isVarargsRequired();
mcimadamore@1215:             }
mcimadamore@1215:             return sym;
duke@1:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
duke@1:         }
duke@1:     }
duke@1: 
mcimadamore@537:     /** Resolve constructor using diamond inference.
mcimadamore@537:      *  @param pos       The position to use for error reporting.
mcimadamore@537:      *  @param env       The environment current at the constructor invocation.
mcimadamore@537:      *  @param site      The type of class for which a constructor is searched.
mcimadamore@537:      *                   The scope of this class has been touched in attribution.
mcimadamore@537:      *  @param argtypes  The types of the constructor invocation's value
mcimadamore@537:      *                   arguments.
mcimadamore@537:      *  @param typeargtypes  The types of the constructor invocation's type
mcimadamore@537:      *                   arguments.
mcimadamore@537:      */
mcimadamore@537:     Symbol resolveDiamond(DiagnosticPosition pos,
mcimadamore@537:                               Env<AttrContext> env,
mcimadamore@537:                               Type site,
mcimadamore@537:                               List<Type> argtypes,
mcimadamore@631:                               List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1215:             Symbol sym = methodNotFound;
mcimadamore@1215:             List<MethodResolutionPhase> steps = methodResolutionSteps;
mcimadamore@1215:             while (steps.nonEmpty() &&
mcimadamore@1215:                    steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
mcimadamore@1215:                    sym.kind >= ERRONEOUS) {
mcimadamore@1215:                 currentResolutionContext.step = steps.head;
mcimadamore@1217:                 sym = findDiamond(env, site, argtypes, typeargtypes,
mcimadamore@1215:                         steps.head.isBoxingRequired(),
mcimadamore@1215:                         env.info.varArgs = steps.head.isVarargsRequired());
mcimadamore@1215:                 currentResolutionContext.resolutionCache.put(steps.head, sym);
mcimadamore@1215:                 steps = steps.tail;
mcimadamore@1215:             }
mcimadamore@1215:             if (sym.kind >= AMBIGUOUS) {
mcimadamore@1215:                 final JCDiagnostic details = sym.kind == WRONG_MTH ?
mcimadamore@1215:                                 currentResolutionContext.candidates.head.details :
mcimadamore@1215:                                 null;
mcimadamore@1215:                 Symbol errSym = new ResolveError(WRONG_MTH, "diamond error") {
mcimadamore@1215:                     @Override
mcimadamore@1215:                     JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
mcimadamore@1215:                             Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1215:                         String key = details == null ?
mcimadamore@1215:                             "cant.apply.diamond" :
mcimadamore@1215:                             "cant.apply.diamond.1";
mcimadamore@1215:                         return diags.create(dkind, log.currentSource(), pos, key,
mcimadamore@1215:                                 diags.fragment("diamond", site.tsym), details);
mcimadamore@1215:                     }
mcimadamore@1215:                 };
mcimadamore@1215:                 MethodResolutionPhase errPhase = currentResolutionContext.firstErroneousResolutionPhase();
mcimadamore@1215:                 sym = access(errSym, pos, site, names.init, true, argtypes, typeargtypes);
mcimadamore@1215:                 env.info.varArgs = errPhase.isVarargsRequired();
mcimadamore@1215:             }
mcimadamore@1215:             return sym;
mcimadamore@537:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
mcimadamore@537:         }
mcimadamore@537:     }
mcimadamore@537: 
mcimadamore@1217:     /** This method scans all the constructor symbol in a given class scope -
mcimadamore@1217:      *  assuming that the original scope contains a constructor of the kind:
mcimadamore@1217:      *  Foo(X x, Y y), where X,Y are class type-variables declared in Foo,
mcimadamore@1217:      *  a method check is executed against the modified constructor type:
mcimadamore@1217:      *  <X,Y>Foo<X,Y>(X x, Y y). This is crucial in order to enable diamond
mcimadamore@1217:      *  inference. The inferred return type of the synthetic constructor IS
mcimadamore@1217:      *  the inferred type for the diamond operator.
mcimadamore@1217:      */
mcimadamore@1217:     private Symbol findDiamond(Env<AttrContext> env,
mcimadamore@1217:                               Type site,
mcimadamore@1217:                               List<Type> argtypes,
mcimadamore@1217:                               List<Type> typeargtypes,
mcimadamore@1217:                               boolean allowBoxing,
mcimadamore@1217:                               boolean useVarargs) {
mcimadamore@1217:         Symbol bestSoFar = methodNotFound;
mcimadamore@1217:         for (Scope.Entry e = site.tsym.members().lookup(names.init);
mcimadamore@1217:              e.scope != null;
mcimadamore@1217:              e = e.next()) {
mcimadamore@1217:             //- System.out.println(" e " + e.sym);
mcimadamore@1217:             if (e.sym.kind == MTH &&
mcimadamore@1217:                 (e.sym.flags_field & SYNTHETIC) == 0) {
mcimadamore@1217:                     List<Type> oldParams = e.sym.type.tag == FORALL ?
mcimadamore@1217:                             ((ForAll)e.sym.type).tvars :
mcimadamore@1217:                             List.<Type>nil();
mcimadamore@1217:                     Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
mcimadamore@1217:                             types.createMethodTypeWithReturn(e.sym.type.asMethodType(), site));
mcimadamore@1217:                     bestSoFar = selectBest(env, site, argtypes, typeargtypes,
mcimadamore@1217:                             new MethodSymbol(e.sym.flags(), names.init, constrType, site.tsym),
mcimadamore@1217:                             bestSoFar,
mcimadamore@1217:                             allowBoxing,
mcimadamore@1217:                             useVarargs,
mcimadamore@1217:                             false);
mcimadamore@1217:             }
mcimadamore@1217:         }
mcimadamore@1217:         return bestSoFar;
mcimadamore@1217:     }
mcimadamore@1217: 
duke@1:     /** Resolve constructor.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the constructor invocation.
duke@1:      *  @param site      The type of class for which a constructor is searched.
duke@1:      *  @param argtypes  The types of the constructor invocation's value
duke@1:      *                   arguments.
duke@1:      *  @param typeargtypes  The types of the constructor invocation's type
duke@1:      *                   arguments.
duke@1:      *  @param allowBoxing Allow boxing and varargs conversions.
duke@1:      *  @param useVarargs Box trailing arguments into an array for varargs.
duke@1:      */
duke@1:     Symbol resolveConstructor(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                               Type site, List<Type> argtypes,
duke@1:                               List<Type> typeargtypes,
duke@1:                               boolean allowBoxing,
duke@1:                               boolean useVarargs) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1215:             return findConstructor(pos, env, site, argtypes, typeargtypes, allowBoxing, useVarargs);
mcimadamore@1215:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
mcimadamore@1215:         }
mcimadamore@1215:     }
mcimadamore@1215: 
mcimadamore@1215:     Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
mcimadamore@1215:                               Type site, List<Type> argtypes,
mcimadamore@1215:                               List<Type> typeargtypes,
mcimadamore@1215:                               boolean allowBoxing,
mcimadamore@1215:                               boolean useVarargs) {
duke@1:         Symbol sym = findMethod(env, site,
mcimadamore@1215:                                     names.init, argtypes,
mcimadamore@1215:                                     typeargtypes, allowBoxing,
mcimadamore@1215:                                     useVarargs, false);
mcimadamore@852:         chk.checkDeprecated(pos, env.info.scope.owner, sym);
duke@1:         return sym;
duke@1:     }
duke@1: 
duke@1:     /** Resolve a constructor, throw a fatal error if not found.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param env       The environment current at the method invocation.
duke@1:      *  @param site      The type to be constructed.
duke@1:      *  @param argtypes  The types of the invocation's value arguments.
duke@1:      *  @param typeargtypes  The types of the invocation's type arguments.
duke@1:      */
duke@1:     public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
duke@1:                                         Type site,
duke@1:                                         List<Type> argtypes,
duke@1:                                         List<Type> typeargtypes) {
mcimadamore@1215:         MethodResolutionContext resolveContext = new MethodResolutionContext();
mcimadamore@1215:         resolveContext.internalResolution = true;
mcimadamore@1215:         Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
duke@1:         if (sym.kind == MTH) return (MethodSymbol)sym;
duke@1:         else throw new FatalError(
mcimadamore@89:                  diags.fragment("fatal.err.cant.locate.ctor", site));
duke@1:     }
duke@1: 
duke@1:     /** Resolve operator.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param optag     The tag of the operation tree.
duke@1:      *  @param env       The environment current at the operation.
duke@1:      *  @param argtypes  The types of the operands.
duke@1:      */
jjg@1127:     Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
duke@1:                            Env<AttrContext> env, List<Type> argtypes) {
mcimadamore@1215:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1215:         try {
mcimadamore@1215:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1215:             Name name = treeinfo.operatorName(optag);
mcimadamore@1215:             Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
mcimadamore@1215:                                     null, false, false, true);
mcimadamore@1215:             if (boxingEnabled && sym.kind >= WRONG_MTHS)
mcimadamore@1215:                 sym = findMethod(env, syms.predefClass.type, name, argtypes,
mcimadamore@1215:                                  null, true, false, true);
mcimadamore@1215:             return access(sym, pos, env.enclClass.sym.type, name,
mcimadamore@1215:                           false, argtypes, null);
mcimadamore@1215:         }
mcimadamore@1215:         finally {
mcimadamore@1215:             currentResolutionContext = prevResolutionContext;
mcimadamore@1215:         }
duke@1:     }
duke@1: 
duke@1:     /** Resolve operator.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param optag     The tag of the operation tree.
duke@1:      *  @param env       The environment current at the operation.
duke@1:      *  @param arg       The type of the operand.
duke@1:      */
jjg@1127:     Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
duke@1:         return resolveOperator(pos, optag, env, List.of(arg));
duke@1:     }
duke@1: 
duke@1:     /** Resolve binary operator.
duke@1:      *  @param pos       The position to use for error reporting.
duke@1:      *  @param optag     The tag of the operation tree.
duke@1:      *  @param env       The environment current at the operation.
duke@1:      *  @param left      The types of the left operand.
duke@1:      *  @param right     The types of the right operand.
duke@1:      */
duke@1:     Symbol resolveBinaryOperator(DiagnosticPosition pos,
jjg@1127:                                  JCTree.Tag optag,
duke@1:                                  Env<AttrContext> env,
duke@1:                                  Type left,
duke@1:                                  Type right) {
duke@1:         return resolveOperator(pos, optag, env, List.of(left, right));
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Resolve `c.name' where name == this or name == super.
duke@1:      * @param pos           The position to use for error reporting.
duke@1:      * @param env           The environment current at the expression.
duke@1:      * @param c             The qualifier.
duke@1:      * @param name          The identifier's name.
duke@1:      */
duke@1:     Symbol resolveSelf(DiagnosticPosition pos,
duke@1:                        Env<AttrContext> env,
duke@1:                        TypeSymbol c,
duke@1:                        Name name) {
duke@1:         Env<AttrContext> env1 = env;
duke@1:         boolean staticOnly = false;
duke@1:         while (env1.outer != null) {
duke@1:             if (isStatic(env1)) staticOnly = true;
duke@1:             if (env1.enclClass.sym == c) {
duke@1:                 Symbol sym = env1.info.scope.lookup(name).sym;
duke@1:                 if (sym != null) {
duke@1:                     if (staticOnly) sym = new StaticError(sym);
duke@1:                     return access(sym, pos, env.enclClass.sym.type,
duke@1:                                   name, true);
duke@1:                 }
duke@1:             }
duke@1:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
duke@1:             env1 = env1.outer;
duke@1:         }
duke@1:         log.error(pos, "not.encl.class", c);
duke@1:         return syms.errSymbol;
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Resolve `c.this' for an enclosing class c that contains the
duke@1:      * named member.
duke@1:      * @param pos           The position to use for error reporting.
duke@1:      * @param env           The environment current at the expression.
duke@1:      * @param member        The member that must be contained in the result.
duke@1:      */
duke@1:     Symbol resolveSelfContaining(DiagnosticPosition pos,
duke@1:                                  Env<AttrContext> env,
mcimadamore@901:                                  Symbol member,
mcimadamore@901:                                  boolean isSuperCall) {
duke@1:         Name name = names._this;
mcimadamore@901:         Env<AttrContext> env1 = isSuperCall ? env.outer : env;
duke@1:         boolean staticOnly = false;
mcimadamore@901:         if (env1 != null) {
mcimadamore@901:             while (env1 != null && env1.outer != null) {
mcimadamore@901:                 if (isStatic(env1)) staticOnly = true;
mcimadamore@901:                 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
mcimadamore@901:                     Symbol sym = env1.info.scope.lookup(name).sym;
mcimadamore@901:                     if (sym != null) {
mcimadamore@901:                         if (staticOnly) sym = new StaticError(sym);
mcimadamore@901:                         return access(sym, pos, env.enclClass.sym.type,
mcimadamore@901:                                       name, true);
mcimadamore@901:                     }
duke@1:                 }
mcimadamore@901:                 if ((env1.enclClass.sym.flags() & STATIC) != 0)
mcimadamore@901:                     staticOnly = true;
mcimadamore@901:                 env1 = env1.outer;
duke@1:             }
duke@1:         }
duke@1:         log.error(pos, "encl.class.required", member);
duke@1:         return syms.errSymbol;
duke@1:     }
duke@1: 
duke@1:     /**
duke@1:      * Resolve an appropriate implicit this instance for t's container.
jjh@972:      * JLS 8.8.5.1 and 15.9.2
duke@1:      */
duke@1:     Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
mcimadamore@901:         return resolveImplicitThis(pos, env, t, false);
mcimadamore@901:     }
mcimadamore@901: 
mcimadamore@901:     Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
duke@1:         Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
duke@1:                          ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
mcimadamore@901:                          : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
duke@1:         if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
duke@1:             log.error(pos, "cant.ref.before.ctor.called", "this");
duke@1:         return thisType;
duke@1:     }
duke@1: 
duke@1: /* ***************************************************************************
duke@1:  *  ResolveError classes, indicating error situations when accessing symbols
duke@1:  ****************************************************************************/
duke@1: 
duke@1:     public void logAccessError(Env<AttrContext> env, JCTree tree, Type type) {
duke@1:         AccessError error = new AccessError(env, type.getEnclosingType(), type.tsym);
mcimadamore@829:         logResolveError(error, tree.pos(), type.getEnclosingType().tsym, type.getEnclosingType(), null, null, null);
mcimadamore@302:     }
mcimadamore@302:     //where
mcimadamore@302:     private void logResolveError(ResolveError error,
mcimadamore@302:             DiagnosticPosition pos,
mcimadamore@829:             Symbol location,
mcimadamore@302:             Type site,
mcimadamore@302:             Name name,
mcimadamore@302:             List<Type> argtypes,
mcimadamore@302:             List<Type> typeargtypes) {
mcimadamore@302:         JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
mcimadamore@829:                 pos, location, site, name, argtypes, typeargtypes);
jjg@643:         if (d != null) {
jjg@643:             d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
mcimadamore@302:             log.report(d);
jjg@643:         }
duke@1:     }
duke@1: 
mcimadamore@161:     private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
mcimadamore@161: 
mcimadamore@161:     public Object methodArguments(List<Type> argtypes) {
mcimadamore@1114:         return argtypes == null || argtypes.isEmpty() ? noArgs : argtypes;
mcimadamore@161:     }
mcimadamore@161: 
mcimadamore@302:     /**
mcimadamore@302:      * Root class for resolution errors. Subclass of ResolveError
mcimadamore@302:      * represent a different kinds of resolution error - as such they must
mcimadamore@302:      * specify how they map into concrete compiler diagnostics.
duke@1:      */
mcimadamore@302:     private abstract class ResolveError extends Symbol {
duke@1: 
mcimadamore@302:         /** The name of the kind of error, for debugging only. */
mcimadamore@302:         final String debugName;
mcimadamore@302: 
mcimadamore@302:         ResolveError(int kind, String debugName) {
duke@1:             super(kind, 0, null, null, null);
duke@1:             this.debugName = debugName;
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
duke@1:         public <R, P> R accept(ElementVisitor<R, P> v, P p) {
duke@1:             throw new AssertionError();
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
duke@1:         public String toString() {
mcimadamore@302:             return debugName;
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
mcimadamore@302:         public boolean exists() {
mcimadamore@302:             return false;
duke@1:         }
duke@1: 
mcimadamore@302:         /**
mcimadamore@302:          * Create an external representation for this erroneous symbol to be
mcimadamore@302:          * used during attribution - by default this returns the symbol of a
mcimadamore@302:          * brand new error type which stores the original type found
mcimadamore@302:          * during resolution.
mcimadamore@302:          *
mcimadamore@302:          * @param name     the name used during resolution
mcimadamore@302:          * @param location the location from which the symbol is accessed
duke@1:          */
mcimadamore@302:         protected Symbol access(Name name, TypeSymbol location) {
mcimadamore@302:             return types.createErrorType(name, location, syms.errSymbol.type).tsym;
duke@1:         }
duke@1: 
mcimadamore@302:         /**
mcimadamore@302:          * Create a diagnostic representing this resolution error.
mcimadamore@302:          *
mcimadamore@302:          * @param dkind     The kind of the diagnostic to be created (e.g error).
mcimadamore@302:          * @param pos       The position to be used for error reporting.
mcimadamore@302:          * @param site      The original type from where the selection took place.
mcimadamore@302:          * @param name      The name of the symbol to be resolved.
mcimadamore@302:          * @param argtypes  The invocation's value arguments,
mcimadamore@302:          *                  if we looked for a method.
mcimadamore@302:          * @param typeargtypes  The invocation's type arguments,
mcimadamore@302:          *                      if we looked for a method.
mcimadamore@302:          */
mcimadamore@302:         abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes);
duke@1: 
mcimadamore@302:         /**
mcimadamore@302:          * A name designates an operator if it consists
mcimadamore@302:          * of a non-empty sequence of operator symbols +-~!/*%&|^<>=
mcimadamore@80:          */
mcimadamore@80:         boolean isOperator(Name name) {
mcimadamore@80:             int i = 0;
jjg@113:             while (i < name.getByteLength() &&
jjg@113:                    "+-~!*/%&|^<>=".indexOf(name.getByteAt(i)) >= 0) i++;
jjg@113:             return i > 0 && i == name.getByteLength();
mcimadamore@80:         }
duke@1:     }
duke@1: 
mcimadamore@302:     /**
mcimadamore@302:      * This class is the root class of all resolution errors caused by
mcimadamore@302:      * an invalid symbol being found during resolution.
duke@1:      */
mcimadamore@302:     abstract class InvalidSymbolError extends ResolveError {
mcimadamore@302: 
mcimadamore@302:         /** The invalid symbol found during resolution */
mcimadamore@302:         Symbol sym;
mcimadamore@302: 
mcimadamore@302:         InvalidSymbolError(int kind, Symbol sym, String debugName) {
mcimadamore@302:             super(kind, debugName);
mcimadamore@302:             this.sym = sym;
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         public boolean exists() {
mcimadamore@302:             return true;
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         public String toString() {
mcimadamore@302:              return super.toString() + " wrongSym=" + sym;
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         public Symbol access(Name name, TypeSymbol location) {
mcimadamore@302:             if (sym.kind >= AMBIGUOUS)
mcimadamore@302:                 return ((ResolveError)sym).access(name, location);
mcimadamore@302:             else if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
mcimadamore@302:                 return types.createErrorType(name, location, sym.type).tsym;
mcimadamore@302:             else
mcimadamore@302:                 return sym;
mcimadamore@302:         }
mcimadamore@302:     }
mcimadamore@302: 
mcimadamore@302:     /**
mcimadamore@302:      * InvalidSymbolError error class indicating that a symbol matching a
mcimadamore@302:      * given name does not exists in a given site.
mcimadamore@302:      */
mcimadamore@302:     class SymbolNotFoundError extends ResolveError {
mcimadamore@302: 
mcimadamore@302:         SymbolNotFoundError(int kind) {
mcimadamore@302:             super(kind, "symbol not found error");
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
mcimadamore@302:             argtypes = argtypes == null ? List.<Type>nil() : argtypes;
mcimadamore@302:             typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
mcimadamore@302:             if (name == names.error)
mcimadamore@302:                 return null;
mcimadamore@302: 
mcimadamore@302:             if (isOperator(name)) {
mcimadamore@829:                 boolean isUnaryOp = argtypes.size() == 1;
mcimadamore@829:                 String key = argtypes.size() == 1 ?
mcimadamore@829:                     "operator.cant.be.applied" :
mcimadamore@829:                     "operator.cant.be.applied.1";
mcimadamore@829:                 Type first = argtypes.head;
mcimadamore@829:                 Type second = !isUnaryOp ? argtypes.tail.head : null;
jjg@612:                 return diags.create(dkind, log.currentSource(), pos,
mcimadamore@829:                         key, name, first, second);
mcimadamore@302:             }
mcimadamore@302:             boolean hasLocation = false;
mcimadamore@855:             if (location == null) {
mcimadamore@855:                 location = site.tsym;
mcimadamore@855:             }
mcimadamore@829:             if (!location.name.isEmpty()) {
mcimadamore@829:                 if (location.kind == PCK && !site.tsym.exists()) {
jjg@612:                     return diags.create(dkind, log.currentSource(), pos,
mcimadamore@829:                         "doesnt.exist", location);
mcimadamore@302:                 }
mcimadamore@829:                 hasLocation = !location.name.equals(names._this) &&
mcimadamore@829:                         !location.name.equals(names._super);
mcimadamore@302:             }
mcimadamore@302:             boolean isConstructor = kind == ABSENT_MTH &&
mcimadamore@302:                     name == names.table.names.init;
mcimadamore@302:             KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
mcimadamore@302:             Name idname = isConstructor ? site.tsym.name : name;
mcimadamore@302:             String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
mcimadamore@302:             if (hasLocation) {
jjg@612:                 return diags.create(dkind, log.currentSource(), pos,
mcimadamore@302:                         errKey, kindname, idname, //symbol kindname, name
mcimadamore@302:                         typeargtypes, argtypes, //type parameters and arguments (if any)
mcimadamore@855:                         getLocationDiag(location, site)); //location kindname, type
mcimadamore@302:             }
mcimadamore@302:             else {
jjg@612:                 return diags.create(dkind, log.currentSource(), pos,
mcimadamore@302:                         errKey, kindname, idname, //symbol kindname, name
mcimadamore@302:                         typeargtypes, argtypes); //type parameters and arguments (if any)
mcimadamore@302:             }
mcimadamore@302:         }
mcimadamore@302:         //where
mcimadamore@302:         private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
mcimadamore@302:             String key = "cant.resolve";
mcimadamore@302:             String suffix = hasLocation ? ".location" : "";
mcimadamore@302:             switch (kindname) {
mcimadamore@302:                 case METHOD:
mcimadamore@302:                 case CONSTRUCTOR: {
mcimadamore@302:                     suffix += ".args";
mcimadamore@302:                     suffix += hasTypeArgs ? ".params" : "";
mcimadamore@302:                 }
mcimadamore@302:             }
mcimadamore@302:             return key + suffix;
mcimadamore@302:         }
mcimadamore@855:         private JCDiagnostic getLocationDiag(Symbol location, Type site) {
mcimadamore@855:             if (location.kind == VAR) {
mcimadamore@855:                 return diags.fragment("location.1",
mcimadamore@829:                     kindName(location),
mcimadamore@829:                     location,
mcimadamore@855:                     location.type);
mcimadamore@855:             } else {
mcimadamore@855:                 return diags.fragment("location",
mcimadamore@855:                     typeKindName(site),
mcimadamore@855:                     site,
mcimadamore@855:                     null);
mcimadamore@855:             }
mcimadamore@829:         }
mcimadamore@302:     }
mcimadamore@302: 
mcimadamore@302:     /**
mcimadamore@302:      * InvalidSymbolError error class indicating that a given symbol
mcimadamore@302:      * (either a method, a constructor or an operand) is not applicable
mcimadamore@302:      * given an actual arguments/type argument list.
mcimadamore@302:      */
mcimadamore@1215:     class InapplicableSymbolError extends ResolveError {
mcimadamore@302: 
mcimadamore@1215:         InapplicableSymbolError() {
mcimadamore@1215:             super(WRONG_MTH, "inapplicable symbol error");
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@1215:         protected InapplicableSymbolError(int kind, String debugName) {
mcimadamore@1215:             super(kind, debugName);
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         public String toString() {
mcimadamore@1215:             return super.toString();
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         @Override
mcimadamore@1215:         public boolean exists() {
mcimadamore@1215:             return true;
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
mcimadamore@302:             if (name == names.error)
mcimadamore@302:                 return null;
mcimadamore@302: 
mcimadamore@302:             if (isOperator(name)) {
mcimadamore@853:                 boolean isUnaryOp = argtypes.size() == 1;
mcimadamore@853:                 String key = argtypes.size() == 1 ?
mcimadamore@853:                     "operator.cant.be.applied" :
mcimadamore@853:                     "operator.cant.be.applied.1";
mcimadamore@853:                 Type first = argtypes.head;
mcimadamore@853:                 Type second = !isUnaryOp ? argtypes.tail.head : null;
mcimadamore@853:                 return diags.create(dkind, log.currentSource(), pos,
mcimadamore@853:                         key, name, first, second);
mcimadamore@302:             }
mcimadamore@302:             else {
mcimadamore@1215:                 Candidate c = errCandidate();
mcimadamore@1215:                 Symbol ws = c.sym.asMemberOf(site, types);
jjg@612:                 return diags.create(dkind, log.currentSource(), pos,
mcimadamore@1215:                           "cant.apply.symbol" + (c.details != null ? ".1" : ""),
mcimadamore@302:                           kindName(ws),
mcimadamore@302:                           ws.name == names.init ? ws.owner.name : ws.name,
mcimadamore@302:                           methodArguments(ws.type.getParameterTypes()),
mcimadamore@302:                           methodArguments(argtypes),
mcimadamore@302:                           kindName(ws.owner),
mcimadamore@302:                           ws.owner.type,
mcimadamore@1215:                           c.details);
mcimadamore@302:             }
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         public Symbol access(Name name, TypeSymbol location) {
mcimadamore@302:             return types.createErrorType(name, location, syms.errSymbol.type).tsym;
mcimadamore@302:         }
mcimadamore@1215: 
mcimadamore@1215:         protected boolean shouldReport(Candidate c) {
mcimadamore@1215:             return !c.isApplicable() &&
mcimadamore@1215:                     (((c.sym.flags() & VARARGS) != 0 && c.step == VARARITY) ||
mcimadamore@1215:                       (c.sym.flags() & VARARGS) == 0 && c.step == (boxingEnabled ? BOX : BASIC));
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         private Candidate errCandidate() {
mcimadamore@1215:             for (Candidate c : currentResolutionContext.candidates) {
mcimadamore@1215:                 if (shouldReport(c)) {
mcimadamore@1215:                     return c;
mcimadamore@1215:                 }
mcimadamore@1215:             }
mcimadamore@1215:             Assert.error();
mcimadamore@1215:             return null;
mcimadamore@1215:         }
mcimadamore@302:     }
mcimadamore@302: 
mcimadamore@302:     /**
mcimadamore@302:      * ResolveError error class indicating that a set of symbols
mcimadamore@302:      * (either methods, constructors or operands) is not applicable
mcimadamore@302:      * given an actual arguments/type argument list.
mcimadamore@302:      */
mcimadamore@1215:     class InapplicableSymbolsError extends InapplicableSymbolError {
mcimadamore@689: 
mcimadamore@1215:         InapplicableSymbolsError() {
mcimadamore@302:             super(WRONG_MTHS, "inapplicable symbols");
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
mcimadamore@1215:             if (currentResolutionContext.candidates.nonEmpty()) {
mcimadamore@689:                 JCDiagnostic err = diags.create(dkind,
mcimadamore@689:                         log.currentSource(),
mcimadamore@689:                         pos,
mcimadamore@689:                         "cant.apply.symbols",
mcimadamore@689:                         name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
mcimadamore@689:                         getName(),
mcimadamore@689:                         argtypes);
mcimadamore@689:                 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(site));
mcimadamore@689:             } else {
mcimadamore@689:                 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
mcimadamore@829:                     location, site, name, argtypes, typeargtypes);
mcimadamore@689:             }
mcimadamore@689:         }
mcimadamore@689: 
mcimadamore@689:         //where
mcimadamore@689:         List<JCDiagnostic> candidateDetails(Type site) {
mcimadamore@689:             List<JCDiagnostic> details = List.nil();
mcimadamore@1215:             for (Candidate c : currentResolutionContext.candidates) {
mcimadamore@1215:                 if (!shouldReport(c)) continue;
mcimadamore@1215:                 JCDiagnostic detailDiag = diags.fragment("inapplicable.method",
mcimadamore@1215:                         Kinds.kindName(c.sym),
mcimadamore@1215:                         c.sym.location(site, types),
mcimadamore@1215:                         c.sym.asMemberOf(site, types),
mcimadamore@1215:                         c.details);
mcimadamore@1215:                 details = details.prepend(detailDiag);
mcimadamore@1215:             }
mcimadamore@689:             return details.reverse();
mcimadamore@689:         }
mcimadamore@689: 
mcimadamore@689:         private Name getName() {
mcimadamore@1215:             Symbol sym = currentResolutionContext.candidates.head.sym;
mcimadamore@689:             return sym.name == names.init ?
mcimadamore@689:                 sym.owner.name :
mcimadamore@689:                 sym.name;
mcimadamore@689:         }
mcimadamore@302:     }
mcimadamore@302: 
mcimadamore@302:     /**
mcimadamore@302:      * An InvalidSymbolError error class indicating that a symbol is not
mcimadamore@302:      * accessible from a given site
mcimadamore@302:      */
mcimadamore@302:     class AccessError extends InvalidSymbolError {
mcimadamore@302: 
mcimadamore@302:         private Env<AttrContext> env;
mcimadamore@302:         private Type site;
duke@1: 
duke@1:         AccessError(Symbol sym) {
duke@1:             this(null, null, sym);
duke@1:         }
duke@1: 
duke@1:         AccessError(Env<AttrContext> env, Type site, Symbol sym) {
duke@1:             super(HIDDEN, sym, "access error");
duke@1:             this.env = env;
duke@1:             this.site = site;
duke@1:             if (debugResolve)
duke@1:                 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
mcimadamore@302:         public boolean exists() {
mcimadamore@302:             return false;
mcimadamore@302:         }
duke@1: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
mcimadamore@302:             if (sym.owner.type.tag == ERROR)
mcimadamore@302:                 return null;
mcimadamore@302: 
mcimadamore@302:             if (sym.name == names.init && sym.owner != site.tsym) {
mcimadamore@302:                 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
mcimadamore@829:                         pos, location, site, name, argtypes, typeargtypes);
mcimadamore@302:             }
mcimadamore@302:             else if ((sym.flags() & PUBLIC) != 0
mcimadamore@302:                 || (env != null && this.site != null
mcimadamore@302:                     && !isAccessible(env, this.site))) {
jjg@612:                 return diags.create(dkind, log.currentSource(),
mcimadamore@302:                         pos, "not.def.access.class.intf.cant.access",
mcimadamore@302:                     sym, sym.location());
mcimadamore@302:             }
mcimadamore@302:             else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
jjg@612:                 return diags.create(dkind, log.currentSource(),
mcimadamore@302:                         pos, "report.access", sym,
mcimadamore@302:                         asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
mcimadamore@302:                         sym.location());
mcimadamore@302:             }
mcimadamore@302:             else {
jjg@612:                 return diags.create(dkind, log.currentSource(),
mcimadamore@302:                         pos, "not.def.public.cant.access", sym, sym.location());
duke@1:             }
duke@1:         }
duke@1:     }
duke@1: 
mcimadamore@302:     /**
mcimadamore@302:      * InvalidSymbolError error class indicating that an instance member
mcimadamore@302:      * has erroneously been accessed from a static context.
duke@1:      */
mcimadamore@302:     class StaticError extends InvalidSymbolError {
mcimadamore@302: 
duke@1:         StaticError(Symbol sym) {
duke@1:             super(STATICERR, sym, "static error");
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
mcimadamore@80:             Symbol errSym = ((sym.kind == TYP && sym.type.tag == CLASS)
mcimadamore@80:                 ? types.erasure(sym.type).tsym
mcimadamore@80:                 : sym);
jjg@612:             return diags.create(dkind, log.currentSource(), pos,
mcimadamore@302:                     "non-static.cant.be.ref", kindName(sym), errSym);
duke@1:         }
duke@1:     }
duke@1: 
mcimadamore@302:     /**
mcimadamore@302:      * InvalidSymbolError error class indicating that a pair of symbols
mcimadamore@302:      * (either methods, constructors or operands) are ambiguous
mcimadamore@302:      * given an actual arguments/type argument list.
duke@1:      */
mcimadamore@302:     class AmbiguityError extends InvalidSymbolError {
mcimadamore@302: 
mcimadamore@302:         /** The other maximally specific symbol */
duke@1:         Symbol sym2;
duke@1: 
duke@1:         AmbiguityError(Symbol sym1, Symbol sym2) {
duke@1:             super(AMBIGUOUS, sym1, "ambiguity error");
duke@1:             this.sym2 = sym2;
duke@1:         }
duke@1: 
mcimadamore@302:         @Override
mcimadamore@302:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
mcimadamore@302:                 DiagnosticPosition pos,
mcimadamore@829:                 Symbol location,
mcimadamore@302:                 Type site,
mcimadamore@302:                 Name name,
mcimadamore@302:                 List<Type> argtypes,
mcimadamore@302:                 List<Type> typeargtypes) {
duke@1:             AmbiguityError pair = this;
duke@1:             while (true) {
mcimadamore@302:                 if (pair.sym.kind == AMBIGUOUS)
mcimadamore@302:                     pair = (AmbiguityError)pair.sym;
duke@1:                 else if (pair.sym2.kind == AMBIGUOUS)
duke@1:                     pair = (AmbiguityError)pair.sym2;
duke@1:                 else break;
duke@1:             }
mcimadamore@302:             Name sname = pair.sym.name;
mcimadamore@302:             if (sname == names.init) sname = pair.sym.owner.name;
jjg@612:             return diags.create(dkind, log.currentSource(),
mcimadamore@302:                       pos, "ref.ambiguous", sname,
mcimadamore@302:                       kindName(pair.sym),
mcimadamore@302:                       pair.sym,
mcimadamore@302:                       pair.sym.location(site, types),
duke@1:                       kindName(pair.sym2),
duke@1:                       pair.sym2,
duke@1:                       pair.sym2.location(site, types));
duke@1:         }
duke@1:     }
mcimadamore@160: 
mcimadamore@160:     enum MethodResolutionPhase {
mcimadamore@160:         BASIC(false, false),
mcimadamore@160:         BOX(true, false),
mcimadamore@160:         VARARITY(true, true);
mcimadamore@160: 
mcimadamore@160:         boolean isBoxingRequired;
mcimadamore@160:         boolean isVarargsRequired;
mcimadamore@160: 
mcimadamore@160:         MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
mcimadamore@160:            this.isBoxingRequired = isBoxingRequired;
mcimadamore@160:            this.isVarargsRequired = isVarargsRequired;
mcimadamore@160:         }
mcimadamore@160: 
mcimadamore@160:         public boolean isBoxingRequired() {
mcimadamore@160:             return isBoxingRequired;
mcimadamore@160:         }
mcimadamore@160: 
mcimadamore@160:         public boolean isVarargsRequired() {
mcimadamore@160:             return isVarargsRequired;
mcimadamore@160:         }
mcimadamore@160: 
mcimadamore@160:         public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
mcimadamore@160:             return (varargsEnabled || !isVarargsRequired) &&
mcimadamore@160:                    (boxingEnabled || !isBoxingRequired);
mcimadamore@160:         }
mcimadamore@160:     }
mcimadamore@160: 
mcimadamore@160:     final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
mcimadamore@160: 
mcimadamore@1215:     /**
mcimadamore@1215:      * A resolution context is used to keep track of intermediate results of
mcimadamore@1215:      * overload resolution, such as list of method that are not applicable
mcimadamore@1215:      * (used to generate more precise diagnostics) and so on. Resolution contexts
mcimadamore@1215:      * can be nested - this means that when each overload resolution routine should
mcimadamore@1215:      * work within the resolution context it created.
mcimadamore@1215:      */
mcimadamore@1215:     class MethodResolutionContext {
mcimadamore@689: 
mcimadamore@1215:         private List<Candidate> candidates = List.nil();
mcimadamore@1114: 
mcimadamore@1215:         private Map<MethodResolutionPhase, Symbol> resolutionCache =
mcimadamore@1215:             new EnumMap<MethodResolutionPhase, Symbol>(MethodResolutionPhase.class);
mcimadamore@1215: 
mcimadamore@1215:         private MethodResolutionPhase step = null;
mcimadamore@1215: 
mcimadamore@1215:         private boolean internalResolution = false;
mcimadamore@1215: 
mcimadamore@1215:         private MethodResolutionPhase firstErroneousResolutionPhase() {
mcimadamore@1215:             MethodResolutionPhase bestSoFar = BASIC;
mcimadamore@1215:             Symbol sym = methodNotFound;
mcimadamore@1215:             List<MethodResolutionPhase> steps = methodResolutionSteps;
mcimadamore@1215:             while (steps.nonEmpty() &&
mcimadamore@1215:                    steps.head.isApplicable(boxingEnabled, varargsEnabled) &&
mcimadamore@1215:                    sym.kind >= WRONG_MTHS) {
mcimadamore@1215:                 sym = resolutionCache.get(steps.head);
mcimadamore@1215:                 bestSoFar = steps.head;
mcimadamore@1215:                 steps = steps.tail;
mcimadamore@1215:             }
mcimadamore@1215:             return bestSoFar;
mcimadamore@160:         }
mcimadamore@1215: 
mcimadamore@1215:         void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
mcimadamore@1215:             Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
mcimadamore@1215:             if (!candidates.contains(c))
mcimadamore@1215:                 candidates = candidates.append(c);
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         void addApplicableCandidate(Symbol sym, Type mtype) {
mcimadamore@1215:             Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
mcimadamore@1215:             candidates = candidates.append(c);
mcimadamore@1215:         }
mcimadamore@1215: 
mcimadamore@1215:         /**
mcimadamore@1215:          * This class represents an overload resolution candidate. There are two
mcimadamore@1215:          * kinds of candidates: applicable methods and inapplicable methods;
mcimadamore@1215:          * applicable methods have a pointer to the instantiated method type,
mcimadamore@1215:          * while inapplicable candidates contain further details about the
mcimadamore@1215:          * reason why the method has been considered inapplicable.
mcimadamore@1215:          */
mcimadamore@1215:         class Candidate {
mcimadamore@1215: 
mcimadamore@1215:             final MethodResolutionPhase step;
mcimadamore@1215:             final Symbol sym;
mcimadamore@1215:             final JCDiagnostic details;
mcimadamore@1215:             final Type mtype;
mcimadamore@1215: 
mcimadamore@1215:             private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
mcimadamore@1215:                 this.step = step;
mcimadamore@1215:                 this.sym = sym;
mcimadamore@1215:                 this.details = details;
mcimadamore@1215:                 this.mtype = mtype;
mcimadamore@1215:             }
mcimadamore@1215: 
mcimadamore@1215:             @Override
mcimadamore@1215:             public boolean equals(Object o) {
mcimadamore@1215:                 if (o instanceof Candidate) {
mcimadamore@1215:                     Symbol s1 = this.sym;
mcimadamore@1215:                     Symbol s2 = ((Candidate)o).sym;
mcimadamore@1215:                     if  ((s1 != s2 &&
mcimadamore@1215:                         (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
mcimadamore@1215:                         (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
mcimadamore@1215:                         ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
mcimadamore@1215:                         return true;
mcimadamore@1215:                 }
mcimadamore@1215:                 return false;
mcimadamore@1215:             }
mcimadamore@1215: 
mcimadamore@1215:             boolean isApplicable() {
mcimadamore@1215:                 return mtype != null;
mcimadamore@1215:             }
mcimadamore@1215:         }
mcimadamore@160:     }
mcimadamore@1215: 
mcimadamore@1215:     MethodResolutionContext currentResolutionContext = null;
duke@1: }