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@1342: import com.sun.tools.javac.code.Symbol.*;
mcimadamore@1114: import com.sun.tools.javac.code.Type.*;
mcimadamore@1238: import com.sun.tools.javac.comp.Attr.ResultInfo;
mcimadamore@1238: import com.sun.tools.javac.comp.Check.CheckContext;
mcimadamore@1347: import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
mcimadamore@1347: import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
mcimadamore@1347: import com.sun.tools.javac.comp.DeferredAttr.DeferredType;
mcimadamore@1337: import com.sun.tools.javac.comp.Infer.InferenceContext;
mcimadamore@1337: import com.sun.tools.javac.comp.Infer.InferenceContext.FreeTypeListener;
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@1352: import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
mcimadamore@1510: import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
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@1342: import java.util.Iterator;
mcimadamore@1394: import java.util.LinkedHashMap;
mcimadamore@1394: import java.util.LinkedHashSet;
mcimadamore@1114: import java.util.Map;
mcimadamore@1393: 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;
jjg@1374: import static com.sun.tools.javac.code.TypeTag.*;
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;
mcimadamore@1238:     Attr attr;
mcimadamore@1347:     DeferredAttr deferredAttr;
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;
mcimadamore@1393:     public final boolean allowDefaultMethods;
mcimadamore@1510:     public final boolean allowStructuralMostSpecific;
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:         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@1238:         attr = Attr.instance(context);
mcimadamore@1347:         deferredAttr = DeferredAttr.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@1393:         allowDefaultMethods = source.allowDefaultMethods();
mcimadamore@1510:         allowStructuralMostSpecific = source.allowStructuralMostSpecific();
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 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: 
vromero@1442:         final 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@1347:         List<Type> argtypes2 = Type.map(argtypes,
mcimadamore@1347:                     deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
mcimadamore@1215:         JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
mcimadamore@1215:                 site.tsym, mostSpecificPos, currentResolutionContext.step,
mcimadamore@1347:                 methodArguments(argtypes2),
mcimadamore@1347:                 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;
jjg@1374:         if (sym.type.hasTag(FORALL)) {
mcimadamore@1268:             subDiag = diags.fragment("partial.inst.sig", inst);
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:      */
ksrini@1346:     protected 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) {
jjg@1374:         return (t.hasTag(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@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: 
mcimadamore@1415:     /**
mcimadamore@1415:      * Performs a recursive scan of a type looking for accessibility problems
mcimadamore@1415:      * from current attribution environment
mcimadamore@1415:      */
mcimadamore@1415:     void checkAccessibleType(Env<AttrContext> env, Type t) {
mcimadamore@1415:         accessibilityChecker.visit(t, env);
mcimadamore@1415:     }
mcimadamore@1415: 
mcimadamore@1415:     /**
mcimadamore@1415:      * Accessibility type-visitor
mcimadamore@1415:      */
mcimadamore@1415:     Types.SimpleVisitor<Void, Env<AttrContext>> accessibilityChecker =
mcimadamore@1415:             new Types.SimpleVisitor<Void, Env<AttrContext>>() {
mcimadamore@1415: 
mcimadamore@1415:         void visit(List<Type> ts, Env<AttrContext> env) {
mcimadamore@1415:             for (Type t : ts) {
mcimadamore@1415:                 visit(t, env);
mcimadamore@1415:             }
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         public Void visitType(Type t, Env<AttrContext> env) {
mcimadamore@1415:             return null;
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         @Override
mcimadamore@1415:         public Void visitArrayType(ArrayType t, Env<AttrContext> env) {
mcimadamore@1415:             visit(t.elemtype, env);
mcimadamore@1415:             return null;
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         @Override
mcimadamore@1415:         public Void visitClassType(ClassType t, Env<AttrContext> env) {
mcimadamore@1415:             visit(t.getTypeArguments(), env);
mcimadamore@1415:             if (!isAccessible(env, t, true)) {
mcimadamore@1415:                 accessBase(new AccessError(t.tsym), env.tree.pos(), env.enclClass.sym, t, t.tsym.name, true);
mcimadamore@1415:             }
mcimadamore@1415:             return null;
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         @Override
mcimadamore@1415:         public Void visitWildcardType(WildcardType t, Env<AttrContext> env) {
mcimadamore@1415:             visit(t.type, env);
mcimadamore@1415:             return null;
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         @Override
mcimadamore@1415:         public Void visitMethodType(MethodType t, Env<AttrContext> env) {
mcimadamore@1415:             visit(t.getParameterTypes(), env);
mcimadamore@1415:             visit(t.getReturnType(), env);
mcimadamore@1415:             visit(t.getThrownTypes(), env);
mcimadamore@1415:             return null;
mcimadamore@1415:         }
mcimadamore@1415:     };
mcimadamore@1415: 
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,
mcimadamore@1268:                         ResultInfo resultInfo,
duke@1:                         List<Type> argtypes,
duke@1:                         List<Type> typeargtypes,
duke@1:                         boolean allowBoxing,
duke@1:                         boolean useVarargs,
mcimadamore@1479:                         MethodCheck methodCheck,
mcimadamore@1394:                         Warner warn) throws Infer.InferenceException {
mcimadamore@1394: 
duke@1:         Type mt = types.memberType(site, m);
duke@1:         // tvars is the list of formal type variables for which type arguments
duke@1:         // need to inferred.
mcimadamore@1268:         List<Type> tvars = List.nil();
duke@1:         if (typeargtypes == null) typeargtypes = List.nil();
jjg@1374:         if (!mt.hasTag(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
jjg@1374:         } else if (mt.hasTag(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);
jjg@1374:         } else if (mt.hasTag(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@1239:         boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
duke@1:         for (List<Type> l = argtypes;
duke@1:              l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
duke@1:              l = l.tail) {
jjg@1374:             if (l.head.hasTag(FORALL)) instNeeded = true;
duke@1:         }
duke@1: 
duke@1:         if (instNeeded)
mcimadamore@1239:             return infer.instantiateMethod(env,
mcimadamore@547:                                     tvars,
duke@1:                                     (MethodType)mt,
mcimadamore@1268:                                     resultInfo,
mcimadamore@580:                                     m,
duke@1:                                     argtypes,
duke@1:                                     allowBoxing,
duke@1:                                     useVarargs,
mcimadamore@1347:                                     currentResolutionContext,
mcimadamore@1479:                                     methodCheck,
duke@1:                                     warn);
mcimadamore@689: 
mcimadamore@1479:         methodCheck.argumentsAcceptable(env, currentResolutionContext.deferredAttrContext(m, infer.emptyContext),
mcimadamore@1479:                                 argtypes, mt.getParameterTypes(), warn);
mcimadamore@689:         return mt;
duke@1:     }
duke@1: 
mcimadamore@1347:     Type checkMethod(Env<AttrContext> env,
mcimadamore@1347:                      Type site,
mcimadamore@1347:                      Symbol m,
mcimadamore@1347:                      ResultInfo resultInfo,
mcimadamore@1347:                      List<Type> argtypes,
mcimadamore@1347:                      List<Type> typeargtypes,
mcimadamore@1347:                      Warner warn) {
mcimadamore@1347:         MethodResolutionContext prevContext = currentResolutionContext;
mcimadamore@1347:         try {
mcimadamore@1347:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1347:             currentResolutionContext.attrMode = DeferredAttr.AttrMode.CHECK;
mcimadamore@1347:             MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
mcimadamore@1347:             return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
mcimadamore@1479:                     step.isBoxingRequired(), step.isVarargsRequired(), resolveMethodCheck, warn);
mcimadamore@1347:         }
mcimadamore@1347:         finally {
mcimadamore@1347:             currentResolutionContext = prevContext;
mcimadamore@1347:         }
mcimadamore@1347:     }
mcimadamore@1347: 
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,
mcimadamore@1268:                      ResultInfo resultInfo,
duke@1:                      List<Type> argtypes,
duke@1:                      List<Type> typeargtypes,
duke@1:                      boolean allowBoxing,
duke@1:                      boolean useVarargs,
mcimadamore@1479:                      MethodCheck methodCheck,
duke@1:                      Warner warn) {
duke@1:         try {
mcimadamore@1268:             return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
mcimadamore@1479:                                   allowBoxing, useVarargs, methodCheck, warn);
mcimadamore@689:         } catch (InapplicableMethodException ex) {
duke@1:             return null;
duke@1:         }
duke@1:     }
duke@1: 
mcimadamore@1479:     /**
mcimadamore@1479:      * This interface defines an entry point that should be used to perform a
mcimadamore@1479:      * method check. A method check usually consist in determining as to whether
mcimadamore@1479:      * a set of types (actuals) is compatible with another set of types (formals).
mcimadamore@1479:      * Since the notion of compatibility can vary depending on the circumstances,
mcimadamore@1479:      * this interfaces allows to easily add new pluggable method check routines.
duke@1:      */
mcimadamore@1479:     interface MethodCheck {
mcimadamore@1479:         /**
mcimadamore@1479:          * Main method check routine. A method check usually consist in determining
mcimadamore@1479:          * as to whether a set of types (actuals) is compatible with another set of
mcimadamore@1479:          * types (formals). If an incompatibility is found, an unchecked exception
mcimadamore@1479:          * is assumed to be thrown.
mcimadamore@1479:          */
mcimadamore@1479:         void argumentsAcceptable(Env<AttrContext> env,
mcimadamore@1479:                                 DeferredAttrContext deferredAttrContext,
mcimadamore@845:                                 List<Type> argtypes,
duke@1:                                 List<Type> formals,
mcimadamore@1479:                                 Warner warn);
mcimadamore@1479:     }
mcimadamore@1479: 
mcimadamore@1479:     /**
mcimadamore@1479:      * Helper enum defining all method check diagnostics (used by resolveMethodCheck).
mcimadamore@1479:      */
mcimadamore@1479:     enum MethodCheckDiag {
mcimadamore@1479:         /**
mcimadamore@1479:          * Actuals and formals differs in length.
mcimadamore@1479:          */
mcimadamore@1479:         ARITY_MISMATCH("arg.length.mismatch", "infer.arg.length.mismatch"),
mcimadamore@1479:         /**
mcimadamore@1479:          * An actual is incompatible with a formal.
mcimadamore@1479:          */
mcimadamore@1479:         ARG_MISMATCH("no.conforming.assignment.exists", "infer.no.conforming.assignment.exists"),
mcimadamore@1479:         /**
mcimadamore@1479:          * An actual is incompatible with the varargs element type.
mcimadamore@1479:          */
mcimadamore@1479:         VARARG_MISMATCH("varargs.argument.mismatch", "infer.varargs.argument.mismatch"),
mcimadamore@1479:         /**
mcimadamore@1479:          * The varargs element type is inaccessible.
mcimadamore@1479:          */
mcimadamore@1479:         INACCESSIBLE_VARARGS("inaccessible.varargs.type", "inaccessible.varargs.type");
mcimadamore@1479: 
mcimadamore@1479:         final String basicKey;
mcimadamore@1479:         final String inferKey;
mcimadamore@1479: 
mcimadamore@1479:         MethodCheckDiag(String basicKey, String inferKey) {
mcimadamore@1479:             this.basicKey = basicKey;
mcimadamore@1479:             this.inferKey = inferKey;
mcimadamore@689:         }
mcimadamore@689:     }
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@1347:      * type-inference, a (possibly empty) inference context is used to convert
mcimadamore@1347:      * formal types to the corresponding 'undet' form ahead of a compatibility
mcimadamore@1347:      * check so that constraints can be propagated and collected.
mcimadamore@1186:      *
mcimadamore@1347:      * Moreover, if one or more types in A is a deferred type, this routine uses
mcimadamore@1347:      * DeferredAttr in order to perform deferred attribution. If one or more actual
mcimadamore@1347:      * deferred types are stuck, they are placed in a queue and revisited later
mcimadamore@1347:      * after the remainder of the arguments have been seen. If this is not sufficient
mcimadamore@1347:      * to 'unstuck' the argument, a cyclic inference error is called out.
mcimadamore@1186:      *
mcimadamore@1186:      * A method check handler (see above) is used in order to report errors.
mcimadamore@1186:      */
mcimadamore@1479:     MethodCheck resolveMethodCheck = new MethodCheck() {
mcimadamore@1479:         @Override
mcimadamore@1479:         public void argumentsAcceptable(final Env<AttrContext> env,
mcimadamore@1479:                                     DeferredAttrContext deferredAttrContext,
mcimadamore@1479:                                     List<Type> argtypes,
mcimadamore@1479:                                     List<Type> formals,
mcimadamore@1479:                                     Warner warn) {
mcimadamore@1479:             //should we expand formals?
mcimadamore@1479:             boolean useVarargs = deferredAttrContext.phase.isVarargsRequired();
mcimadamore@1479: 
mcimadamore@1479:             //inference context used during this method check
mcimadamore@1479:             InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
mcimadamore@1479: 
mcimadamore@1479:             Type varargsFormal = useVarargs ? formals.last() : null;
mcimadamore@1479: 
mcimadamore@1479:             if (varargsFormal == null &&
mcimadamore@1479:                     argtypes.size() != formals.size()) {
mcimadamore@1479:                 report(MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
mcimadamore@1479:             }
mcimadamore@1479: 
mcimadamore@1479:             while (argtypes.nonEmpty() && formals.head != varargsFormal) {
mcimadamore@1479:                 ResultInfo mresult = methodCheckResult(false, formals.head, deferredAttrContext, warn);
mcimadamore@1347:                 mresult.check(null, argtypes.head);
mcimadamore@689:                 argtypes = argtypes.tail;
mcimadamore@1479:                 formals = formals.tail;
mcimadamore@689:             }
mcimadamore@1479: 
mcimadamore@1479:             if (formals.head != varargsFormal) {
mcimadamore@1479:                 report(MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
mcimadamore@1479:             }
mcimadamore@1479: 
mcimadamore@1479:             if (useVarargs) {
mcimadamore@1479:                 //note: if applicability check is triggered by most specific test,
mcimadamore@1479:                 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
mcimadamore@1479:                 final Type elt = types.elemtype(varargsFormal);
mcimadamore@1479:                 ResultInfo mresult = methodCheckResult(true, elt, deferredAttrContext, warn);
mcimadamore@1479:                 while (argtypes.nonEmpty()) {
mcimadamore@1479:                     mresult.check(null, argtypes.head);
mcimadamore@1479:                     argtypes = argtypes.tail;
mcimadamore@1337:                 }
mcimadamore@1479:                 //check varargs element type accessibility
mcimadamore@1479:                 varargsAccessible(env, elt, inferenceContext);
mcimadamore@845:             }
duke@1:         }
mcimadamore@1479: 
mcimadamore@1479:         private void report(MethodCheckDiag diag, InferenceContext inferenceContext, Object... args) {
mcimadamore@1479:             boolean inferDiag = inferenceContext != infer.emptyContext;
mcimadamore@1479:             InapplicableMethodException ex = inferDiag ?
mcimadamore@1479:                     infer.inferenceException : inapplicableMethodException;
mcimadamore@1479:             if (inferDiag && (!diag.inferKey.equals(diag.basicKey))) {
mcimadamore@1479:                 Object[] args2 = new Object[args.length + 1];
mcimadamore@1479:                 System.arraycopy(args, 0, args2, 1, args.length);
mcimadamore@1479:                 args2[0] = inferenceContext.inferenceVars();
mcimadamore@1479:                 args = args2;
mcimadamore@1479:             }
mcimadamore@1479:             throw ex.setMessage(inferDiag ? diag.inferKey : diag.basicKey, args);
mcimadamore@1479:         }
mcimadamore@1479: 
mcimadamore@1479:         private void varargsAccessible(final Env<AttrContext> env, final Type t, final InferenceContext inferenceContext) {
mcimadamore@1479:             if (inferenceContext.free(t)) {
mcimadamore@1479:                 inferenceContext.addFreeTypeListener(List.of(t), new FreeTypeListener() {
mcimadamore@1479:                     @Override
mcimadamore@1479:                     public void typesInferred(InferenceContext inferenceContext) {
mcimadamore@1479:                         varargsAccessible(env, inferenceContext.asInstType(t, types), inferenceContext);
mcimadamore@1479:                     }
mcimadamore@1479:                 });
mcimadamore@1479:             } else {
mcimadamore@1479:                 if (!isAccessible(env, t)) {
mcimadamore@1479:                     Symbol location = env.enclClass.sym;
mcimadamore@1479:                     report(MethodCheckDiag.INACCESSIBLE_VARARGS, inferenceContext, t, Kinds.kindName(location), location);
mcimadamore@1479:                 }
mcimadamore@1479:             }
mcimadamore@1479:         }
mcimadamore@1479: 
mcimadamore@1479:         private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
mcimadamore@1479:                 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
mcimadamore@1479:             CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
mcimadamore@1479:                 MethodCheckDiag methodDiag = varargsCheck ?
mcimadamore@1479:                                  MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
mcimadamore@1479: 
mcimadamore@1479:                 @Override
mcimadamore@1479:                 public void report(DiagnosticPosition pos, JCDiagnostic details) {
mcimadamore@1479:                     report(methodDiag, deferredAttrContext.inferenceContext, details);
mcimadamore@1479:                 }
mcimadamore@1479:             };
mcimadamore@1479:             return new MethodResultInfo(to, checkContext);
mcimadamore@1479:         }
mcimadamore@1479:     };
mcimadamore@689: 
mcimadamore@1238:     /**
mcimadamore@1238:      * Check context to be used during method applicability checks. A method check
mcimadamore@1238:      * context might contain inference variables.
mcimadamore@1238:      */
mcimadamore@1238:     abstract class MethodCheckContext implements CheckContext {
mcimadamore@689: 
mcimadamore@1479:         boolean strict;
mcimadamore@1347:         DeferredAttrContext deferredAttrContext;
mcimadamore@1238:         Warner rsWarner;
mcimadamore@1238: 
mcimadamore@1479:         public MethodCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
mcimadamore@1479:            this.strict = strict;
mcimadamore@1479:            this.deferredAttrContext = deferredAttrContext;
mcimadamore@1479:            this.rsWarner = rsWarner;
mcimadamore@1238:         }
mcimadamore@1238: 
mcimadamore@1479:         public boolean compatible(Type found, Type req, Warner warn) {
mcimadamore@1479:             return strict ?
mcimadamore@1479:                     types.isSubtypeUnchecked(found, deferredAttrContext.inferenceContext.asFree(req, types), warn) :
mcimadamore@1479:                     types.isConvertible(found, deferredAttrContext.inferenceContext.asFree(req, types), warn);
mcimadamore@1479:         }
mcimadamore@1479: 
mcimadamore@1296:         public void report(DiagnosticPosition pos, JCDiagnostic details) {
mcimadamore@1479:             throw inapplicableMethodException.setMessage(details);
mcimadamore@1238:         }
mcimadamore@1238: 
mcimadamore@1238:         public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
mcimadamore@1238:             return rsWarner;
mcimadamore@1238:         }
mcimadamore@1337: 
mcimadamore@1337:         public InferenceContext inferenceContext() {
mcimadamore@1479:             return deferredAttrContext.inferenceContext;
mcimadamore@1337:         }
mcimadamore@1347: 
mcimadamore@1347:         public DeferredAttrContext deferredAttrContext() {
mcimadamore@1347:             return deferredAttrContext;
mcimadamore@1347:         }
mcimadamore@1238:     }
mcimadamore@1238: 
mcimadamore@1238:     /**
mcimadamore@1479:      * ResultInfo class to be used during method applicability checks. Check
mcimadamore@1479:      * for deferred types goes through special path.
mcimadamore@1238:      */
mcimadamore@1347:     class MethodResultInfo extends ResultInfo {
mcimadamore@1347: 
mcimadamore@1479:         public MethodResultInfo(Type pt, CheckContext checkContext) {
mcimadamore@1347:             attr.super(VAL, pt, checkContext);
mcimadamore@1347:         }
mcimadamore@1347: 
mcimadamore@1347:         @Override
mcimadamore@1347:         protected Type check(DiagnosticPosition pos, Type found) {
jjg@1374:             if (found.hasTag(DEFERRED)) {
mcimadamore@1347:                 DeferredType dt = (DeferredType)found;
mcimadamore@1347:                 return dt.check(this);
mcimadamore@1347:             } else {
mcimadamore@1338:                 return super.check(pos, chk.checkNonVoid(pos, types.capture(types.upperBound(found.baseType()))));
mcimadamore@689:             }
mcimadamore@1347:         }
mcimadamore@1347: 
mcimadamore@1347:         @Override
mcimadamore@1347:         protected MethodResultInfo dup(Type newPt) {
mcimadamore@1479:             return new MethodResultInfo(newPt, checkContext);
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         @Override
mcimadamore@1415:         protected ResultInfo dup(CheckContext newContext) {
mcimadamore@1479:             return new MethodResultInfo(pt, newContext);
mcimadamore@1347:         }
mcimadamore@1238:     }
mcimadamore@689: 
mcimadamore@1510:     /**
mcimadamore@1510:      * Most specific method applicability routine. Given a list of actual types A,
mcimadamore@1510:      * a list of formal types F1, and a list of formal types F2, the routine determines
mcimadamore@1510:      * as to whether the types in F1 can be considered more specific than those in F2 w.r.t.
mcimadamore@1510:      * argument types A.
mcimadamore@1510:      */
mcimadamore@1510:     class MostSpecificCheck implements MethodCheck {
mcimadamore@1510: 
mcimadamore@1510:         boolean strict;
mcimadamore@1510:         List<Type> actuals;
mcimadamore@1510: 
mcimadamore@1510:         MostSpecificCheck(boolean strict, List<Type> actuals) {
mcimadamore@1510:             this.strict = strict;
mcimadamore@1510:             this.actuals = actuals;
mcimadamore@1510:         }
mcimadamore@1510: 
mcimadamore@1510:         @Override
mcimadamore@1510:         public void argumentsAcceptable(final Env<AttrContext> env,
mcimadamore@1510:                                     DeferredAttrContext deferredAttrContext,
mcimadamore@1510:                                     List<Type> formals1,
mcimadamore@1510:                                     List<Type> formals2,
mcimadamore@1510:                                     Warner warn) {
mcimadamore@1510:             formals2 = adjustArgs(formals2, deferredAttrContext.msym, formals1.length(), deferredAttrContext.phase.isVarargsRequired());
mcimadamore@1510:             while (formals2.nonEmpty()) {
mcimadamore@1510:                 ResultInfo mresult = methodCheckResult(formals2.head, deferredAttrContext, warn, actuals.head);
mcimadamore@1510:                 mresult.check(null, formals1.head);
mcimadamore@1510:                 formals1 = formals1.tail;
mcimadamore@1510:                 formals2 = formals2.tail;
mcimadamore@1510:                 actuals = actuals.isEmpty() ? actuals : actuals.tail;
mcimadamore@1510:             }
mcimadamore@1510:         }
mcimadamore@1510: 
mcimadamore@1510:        /**
mcimadamore@1510:         * Create a method check context to be used during the most specific applicability check
mcimadamore@1510:         */
mcimadamore@1510:         ResultInfo methodCheckResult(Type to, DeferredAttr.DeferredAttrContext deferredAttrContext,
mcimadamore@1510:                Warner rsWarner, Type actual) {
mcimadamore@1510:            return attr.new ResultInfo(Kinds.VAL, to,
mcimadamore@1510:                    new MostSpecificCheckContext(strict, deferredAttrContext, rsWarner, actual));
mcimadamore@1510:         }
mcimadamore@1510: 
mcimadamore@1510:         /**
mcimadamore@1510:          * Subclass of method check context class that implements most specific
mcimadamore@1510:          * method conversion. If the actual type under analysis is a deferred type
mcimadamore@1510:          * a full blown structural analysis is carried out.
mcimadamore@1510:          */
mcimadamore@1510:         class MostSpecificCheckContext extends MethodCheckContext {
mcimadamore@1510: 
mcimadamore@1510:             Type actual;
mcimadamore@1510: 
mcimadamore@1510:             public MostSpecificCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner, Type actual) {
mcimadamore@1510:                 super(strict, deferredAttrContext, rsWarner);
mcimadamore@1510:                 this.actual = actual;
mcimadamore@1510:             }
mcimadamore@1510: 
mcimadamore@1510:             public boolean compatible(Type found, Type req, Warner warn) {
mcimadamore@1510:                 if (!allowStructuralMostSpecific || actual == null) {
mcimadamore@1510:                     return super.compatible(found, req, warn);
mcimadamore@1510:                 } else {
mcimadamore@1510:                     switch (actual.getTag()) {
mcimadamore@1510:                         case DEFERRED:
mcimadamore@1510:                             DeferredType dt = (DeferredType) actual;
mcimadamore@1510:                             DeferredType.SpeculativeCache.Entry e = dt.speculativeCache.get(deferredAttrContext.msym, deferredAttrContext.phase);
mcimadamore@1510:                             return (e == null || e.speculativeTree == deferredAttr.stuckTree)
mcimadamore@1510:                                     ? false : mostSpecific(found, req, e.speculativeTree, warn);
mcimadamore@1510:                         default:
mcimadamore@1510:                             return standaloneMostSpecific(found, req, actual, warn);
mcimadamore@1510:                     }
mcimadamore@1510:                 }
mcimadamore@1510:             }
mcimadamore@1510: 
mcimadamore@1510:             private boolean mostSpecific(Type t, Type s, JCTree tree, Warner warn) {
mcimadamore@1510:                 MostSpecificChecker msc = new MostSpecificChecker(t, s, warn);
mcimadamore@1510:                 msc.scan(tree);
mcimadamore@1510:                 return msc.result;
mcimadamore@1510:             }
mcimadamore@1510: 
mcimadamore@1510:             boolean polyMostSpecific(Type t1, Type t2, Warner warn) {
mcimadamore@1510:                 return (!t1.isPrimitive() && t2.isPrimitive())
mcimadamore@1510:                         ? true : super.compatible(t1, t2, warn);
mcimadamore@1510:             }
mcimadamore@1510: 
mcimadamore@1510:             boolean standaloneMostSpecific(Type t1, Type t2, Type exprType, Warner warn) {
mcimadamore@1510:                 return (exprType.isPrimitive() == t1.isPrimitive()
mcimadamore@1510:                         && exprType.isPrimitive() != t2.isPrimitive())
mcimadamore@1510:                         ? true : super.compatible(t1, t2, warn);
mcimadamore@1510:             }
mcimadamore@1510: 
mcimadamore@1510:             /**
mcimadamore@1510:              * Structural checker for most specific.
mcimadamore@1510:              */
mcimadamore@1510:             class MostSpecificChecker extends DeferredAttr.PolyScanner {
mcimadamore@1510: 
mcimadamore@1510:                 final Type t;
mcimadamore@1510:                 final Type s;
mcimadamore@1510:                 final Warner warn;
mcimadamore@1510:                 boolean result;
mcimadamore@1510: 
mcimadamore@1510:                 MostSpecificChecker(Type t, Type s, Warner warn) {
mcimadamore@1510:                     this.t = t;
mcimadamore@1510:                     this.s = s;
mcimadamore@1510:                     this.warn = warn;
mcimadamore@1510:                     result = true;
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 void skip(JCTree tree) {
mcimadamore@1510:                     result &= standaloneMostSpecific(t, s, tree.type, warn);
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 public void visitConditional(JCConditional tree) {
mcimadamore@1510:                     if (tree.polyKind == PolyKind.STANDALONE) {
mcimadamore@1510:                         result &= standaloneMostSpecific(t, s, tree.type, warn);
mcimadamore@1510:                     } else {
mcimadamore@1510:                         super.visitConditional(tree);
mcimadamore@1510:                     }
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 public void visitApply(JCMethodInvocation tree) {
mcimadamore@1510:                     result &= (tree.polyKind == PolyKind.STANDALONE)
mcimadamore@1510:                             ? standaloneMostSpecific(t, s, tree.type, warn)
mcimadamore@1510:                             : polyMostSpecific(t, s, warn);
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 public void visitNewClass(JCNewClass tree) {
mcimadamore@1510:                     result &= (tree.polyKind == PolyKind.STANDALONE)
mcimadamore@1510:                             ? standaloneMostSpecific(t, s, tree.type, warn)
mcimadamore@1510:                             : polyMostSpecific(t, s, warn);
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 public void visitReference(JCMemberReference tree) {
mcimadamore@1510:                     if (types.isFunctionalInterface(t.tsym) &&
mcimadamore@1510:                             types.isFunctionalInterface(s.tsym) &&
mcimadamore@1510:                             types.asSuper(t, s.tsym) == null &&
mcimadamore@1510:                             types.asSuper(s, t.tsym) == null) {
mcimadamore@1510:                         Type desc_t = types.findDescriptorType(t);
mcimadamore@1510:                         Type desc_s = types.findDescriptorType(s);
mcimadamore@1510:                         if (types.isSameTypes(desc_t.getParameterTypes(), desc_s.getParameterTypes())) {
mcimadamore@1510:                             if (!desc_s.getReturnType().hasTag(VOID)) {
mcimadamore@1510:                                 //perform structural comparison
mcimadamore@1510:                                 Type ret_t = desc_t.getReturnType();
mcimadamore@1510:                                 Type ret_s = desc_s.getReturnType();
mcimadamore@1510:                                 result &= ((tree.refPolyKind == PolyKind.STANDALONE)
mcimadamore@1510:                                         ? standaloneMostSpecific(ret_t, ret_s, tree.type, warn)
mcimadamore@1510:                                         : polyMostSpecific(ret_t, ret_s, warn));
mcimadamore@1510:                             } else {
mcimadamore@1510:                                 return;
mcimadamore@1510:                             }
mcimadamore@1510:                         } else {
mcimadamore@1510:                             result &= false;
mcimadamore@1510:                         }
mcimadamore@1510:                     } else {
mcimadamore@1510:                         result &= MostSpecificCheckContext.super.compatible(t, s, warn);
mcimadamore@1510:                     }
mcimadamore@1510:                 }
mcimadamore@1510: 
mcimadamore@1510:                 @Override
mcimadamore@1510:                 public void visitLambda(JCLambda tree) {
mcimadamore@1510:                     if (types.isFunctionalInterface(t.tsym) &&
mcimadamore@1510:                             types.isFunctionalInterface(s.tsym) &&
mcimadamore@1510:                             types.asSuper(t, s.tsym) == null &&
mcimadamore@1510:                             types.asSuper(s, t.tsym) == null) {
mcimadamore@1510:                         Type desc_t = types.findDescriptorType(t);
mcimadamore@1510:                         Type desc_s = types.findDescriptorType(s);
mcimadamore@1510:                         if (tree.paramKind == JCLambda.ParameterKind.EXPLICIT
mcimadamore@1510:                                 || types.isSameTypes(desc_t.getParameterTypes(), desc_s.getParameterTypes())) {
mcimadamore@1510:                             if (!desc_s.getReturnType().hasTag(VOID)) {
mcimadamore@1510:                                 //perform structural comparison
mcimadamore@1510:                                 Type ret_t = desc_t.getReturnType();
mcimadamore@1510:                                 Type ret_s = desc_s.getReturnType();
mcimadamore@1510:                                 scanLambdaBody(tree, ret_t, ret_s);
mcimadamore@1510:                             } else {
mcimadamore@1510:                                 return;
mcimadamore@1510:                             }
mcimadamore@1510:                         } else {
mcimadamore@1510:                             result &= false;
mcimadamore@1510:                         }
mcimadamore@1510:                     } else {
mcimadamore@1510:                         result &= MostSpecificCheckContext.super.compatible(t, s, warn);
mcimadamore@1510:                     }
mcimadamore@1510:                 }
mcimadamore@1510:                 //where
mcimadamore@1510: 
mcimadamore@1510:                 void scanLambdaBody(JCLambda lambda, final Type t, final Type s) {
mcimadamore@1510:                     if (lambda.getBodyKind() == JCTree.JCLambda.BodyKind.EXPRESSION) {
mcimadamore@1510:                         result &= MostSpecificCheckContext.this.mostSpecific(t, s, lambda.body, warn);
mcimadamore@1510:                     } else {
mcimadamore@1510:                         DeferredAttr.LambdaReturnScanner lambdaScanner =
mcimadamore@1510:                                 new DeferredAttr.LambdaReturnScanner() {
mcimadamore@1510:                                     @Override
mcimadamore@1510:                                     public void visitReturn(JCReturn tree) {
mcimadamore@1510:                                         if (tree.expr != null) {
mcimadamore@1510:                                             result &= MostSpecificCheckContext.this.mostSpecific(t, s, tree.expr, warn);
mcimadamore@1510:                                         }
mcimadamore@1510:                                     }
mcimadamore@1510:                                 };
mcimadamore@1510:                         lambdaScanner.scan(lambda.body);
mcimadamore@1510:                     }
mcimadamore@1510:                 }
mcimadamore@1510:             }
mcimadamore@1510:         }
mcimadamore@1510:     }
mcimadamore@1510: 
mcimadamore@1238:     public static class InapplicableMethodException extends RuntimeException {
mcimadamore@1238:         private static final long serialVersionUID = 0;
mcimadamore@1238: 
mcimadamore@1238:         JCDiagnostic diagnostic;
mcimadamore@1238:         JCDiagnostic.Factory diags;
mcimadamore@1238: 
mcimadamore@1238:         InapplicableMethodException(JCDiagnostic.Factory diags) {
mcimadamore@1238:             this.diagnostic = null;
mcimadamore@1238:             this.diags = diags;
mcimadamore@689:         }
mcimadamore@1238:         InapplicableMethodException setMessage() {
mcimadamore@1337:             return setMessage((JCDiagnostic)null);
mcimadamore@1238:         }
mcimadamore@1238:         InapplicableMethodException setMessage(String key) {
mcimadamore@1337:             return setMessage(key != null ? diags.fragment(key) : null);
mcimadamore@1238:         }
mcimadamore@1238:         InapplicableMethodException setMessage(String key, Object... args) {
mcimadamore@1337:             return setMessage(key != null ? diags.fragment(key, args) : null);
mcimadamore@1238:         }
mcimadamore@1238:         InapplicableMethodException setMessage(JCDiagnostic diag) {
mcimadamore@1238:             this.diagnostic = diag;
mcimadamore@1238:             return this;
mcimadamore@1238:         }
mcimadamore@1238: 
mcimadamore@1238:         public JCDiagnostic getDiagnostic() {
mcimadamore@1238:             return diagnostic;
mcimadamore@1238:         }
mcimadamore@1238:     }
mcimadamore@1238:     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) {
jjg@1374:         while (c.type.hasTag(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);
jjg@1374:         if (st != null && (st.hasTag(CLASS) || st.hasTag(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) {
mcimadamore@1394:         if (sym.kind == ERR ||
mcimadamore@1394:                 !sym.isInheritedIn(site.tsym, types) ||
mcimadamore@1394:                 (useVarargs && (sym.flags() & VARARGS) == 0)) {
mcimadamore@1394:             return bestSoFar;
mcimadamore@1394:         }
jjg@816:         Assert.check(sym.kind < AMBIGUOUS);
duke@1:         try {
mcimadamore@1268:             Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
mcimadamore@1479:                                allowBoxing, useVarargs, resolveMethodCheck, types.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) {
mcimadamore@1394:                 case ABSENT_MTH:
mcimadamore@1394:                     return new InapplicableSymbolError(currentResolutionContext);
mcimadamore@1394:                 case WRONG_MTH:
mcimadamore@1394:                     if (operator) return bestSoFar;
mcimadamore@1394:                     bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
mcimadamore@1394:                 default:
mcimadamore@1394:                     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
mcimadamore@1348:             : mostSpecific(argtypes, 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:      */
mcimadamore@1348:     Symbol mostSpecific(List<Type> argtypes, 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@1348:             boolean m1SignatureMoreSpecific =
mcimadamore@1348:                     signatureMoreSpecific(argtypes, env, site, m1, m2, allowBoxing, useVarargs);
mcimadamore@1348:             boolean m2SignatureMoreSpecific =
mcimadamore@1348:                     signatureMoreSpecific(argtypes, 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
mcimadamore@1480:                 return ambiguityError(m1, m2);
duke@1:             }
duke@1:             if (m1SignatureMoreSpecific) return m1;
duke@1:             if (m2SignatureMoreSpecific) return m2;
mcimadamore@844:             return ambiguityError(m1, m2);
duke@1:         case AMBIGUOUS:
mcimadamore@1480:             //check if m1 is more specific than all ambiguous methods in m2
duke@1:             AmbiguityError e = (AmbiguityError)m2;
mcimadamore@1480:             for (Symbol s : e.ambiguousSyms) {
mcimadamore@1480:                 if (mostSpecific(argtypes, m1, s, env, site, allowBoxing, useVarargs) != m1) {
mcimadamore@1480:                     return e.addAmbiguousSymbol(m1);
mcimadamore@1480:                 }
mcimadamore@1480:             }
mcimadamore@1480:             return m1;
duke@1:         default:
duke@1:             throw new AssertionError();
duke@1:         }
duke@1:     }
mcimadamore@775:     //where
mcimadamore@1348:     private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
mcimadamore@1510:         noteWarner.clear();
mcimadamore@1510:         int maxLength = Math.max(
mcimadamore@1510:                             Math.max(m1.type.getParameterTypes().length(), actuals.length()),
mcimadamore@1510:                             m2.type.getParameterTypes().length());
mcimadamore@1510:         Type mst = instantiate(env, site, m2, null,
mcimadamore@1510:                 adjustArgs(types.lowerBounds(types.memberType(site, m1).getParameterTypes()), m1, maxLength, useVarargs), null,
mcimadamore@1510:                 allowBoxing, useVarargs, new MostSpecificCheck(!allowBoxing, actuals), noteWarner);
mcimadamore@1510:         return mst != null &&
mcimadamore@1510:                 !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
mcimadamore@1510:     }
mcimadamore@1510:     private List<Type> adjustArgs(List<Type> args, Symbol msym, int length, boolean allowVarargs) {
mcimadamore@1510:         if ((msym.flags() & VARARGS) != 0 && allowVarargs) {
mcimadamore@1510:             Type varargsElem = types.elemtype(args.last());
mcimadamore@1510:             if (varargsElem == null) {
mcimadamore@1510:                 Assert.error("Bad varargs = " + args.last() + " " + msym);
mcimadamore@1510:             }
mcimadamore@1510:             List<Type> newArgs = args.reverse().tail.prepend(varargsElem).reverse();
mcimadamore@1510:             while (newArgs.length() < length) {
mcimadamore@1510:                 newArgs = newArgs.append(newArgs.last());
mcimadamore@1510:             }
mcimadamore@1510:             return newArgs;
mcimadamore@1510:         } else {
mcimadamore@1510:             return args;
mcimadamore@1348:         }
mcimadamore@1348:     }
mcimadamore@1348:     //where
mcimadamore@1059:     Type mostSpecificReturnType(Type mt1, Type mt2) {
mcimadamore@1059:         Type rt1 = mt1.getReturnType();
mcimadamore@1059:         Type rt2 = mt2.getReturnType();
mcimadamore@1059: 
jjg@1374:         if (mt1.hasTag(FORALL) && mt2.hasTag(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: 
mcimadamore@1394:     Symbol findMethodInScope(Env<AttrContext> env,
mcimadamore@1393:             Type site,
mcimadamore@1393:             Name name,
mcimadamore@1393:             List<Type> argtypes,
mcimadamore@1393:             List<Type> typeargtypes,
mcimadamore@1393:             Scope sc,
mcimadamore@1393:             Symbol bestSoFar,
mcimadamore@1393:             boolean allowBoxing,
mcimadamore@1393:             boolean useVarargs,
mcimadamore@1393:             boolean operator,
mcimadamore@1393:             boolean abstractok) {
mcimadamore@1393:         for (Symbol s : sc.getElementsByName(name, new LookupFilter(abstractok))) {
mcimadamore@1393:             bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
mcimadamore@1393:                     bestSoFar, allowBoxing, useVarargs, operator);
mcimadamore@1393:         }
mcimadamore@1393:         return bestSoFar;
mcimadamore@1393:     }
mcimadamore@1393:     //where
mcimadamore@1393:         class LookupFilter implements Filter<Symbol> {
mcimadamore@1393: 
mcimadamore@1393:             boolean abstractOk;
mcimadamore@1393: 
mcimadamore@1393:             LookupFilter(boolean abstractOk) {
mcimadamore@1393:                 this.abstractOk = abstractOk;
mcimadamore@1393:             }
mcimadamore@1393: 
mcimadamore@1393:             public boolean accepts(Symbol s) {
mcimadamore@1393:                 long flags = s.flags();
mcimadamore@1393:                 return s.kind == MTH &&
mcimadamore@1393:                         (flags & SYNTHETIC) == 0 &&
mcimadamore@1393:                         (abstractOk ||
mcimadamore@1393:                         (flags & DEFAULT) != 0 ||
mcimadamore@1393:                         (flags & ABSTRACT) == 0);
mcimadamore@1393:             }
mcimadamore@1393:         };
mcimadamore@1393: 
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,
jrose@571:                           bestSoFar,
duke@1:                           allowBoxing,
duke@1:                           useVarargs,
mcimadamore@1335:                           operator);
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:                               Symbol bestSoFar,
duke@1:                               boolean allowBoxing,
duke@1:                               boolean useVarargs,
mcimadamore@1335:                               boolean operator) {
mcimadamore@1393:         @SuppressWarnings({"unchecked","rawtypes"})
mcimadamore@1393:         List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
mcimadamore@1393:         InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
mcimadamore@1335:         for (TypeSymbol s : superclasses(intype)) {
mcimadamore@1394:             bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
mcimadamore@1335:                     s.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
mcimadamore@1393:             if (name == names.init) return bestSoFar;
mcimadamore@1393:             iphase = (iphase == null) ? null : iphase.update(s, this);
mcimadamore@1393:             if (iphase != null) {
mcimadamore@1335:                 for (Type itype : types.interfaces(s.type)) {
mcimadamore@1393:                     itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
duke@1:                 }
duke@1:             }
mcimadamore@1335:         }
mcimadamore@1335: 
mcimadamore@1335:         Symbol concrete = bestSoFar.kind < ERR &&
mcimadamore@1335:                 (bestSoFar.flags() & ABSTRACT) == 0 ?
mcimadamore@1335:                 bestSoFar : methodNotFound;
mcimadamore@1335: 
mcimadamore@1393:         for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
mcimadamore@1393:             if (iphase2 == InterfaceLookupPhase.DEFAULT_OK && !allowDefaultMethods) break;
mcimadamore@1335:             //keep searching for abstract methods
mcimadamore@1393:             for (Type itype : itypes[iphase2.ordinal()]) {
mcimadamore@1335:                 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
mcimadamore@1393:                 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
mcimadamore@1393:                         (itype.tsym.flags() & DEFAULT) == 0) continue;
mcimadamore@1394:                 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
mcimadamore@1393:                         itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
mcimadamore@1393:                 if (concrete != bestSoFar &&
mcimadamore@1393:                         concrete.kind < ERR  && bestSoFar.kind < ERR &&
mcimadamore@1393:                         types.isSubSignature(concrete.type, bestSoFar.type)) {
mcimadamore@1393:                     //this is an hack - as javac does not do full membership checks
mcimadamore@1393:                     //most specific ends up comparing abstract methods that might have
mcimadamore@1393:                     //been implemented by some concrete method in a subclass and,
mcimadamore@1393:                     //because of raw override, it is possible for an abstract method
mcimadamore@1393:                     //to be more specific than the concrete method - so we need
mcimadamore@1393:                     //to explicitly call that out (see CR 6178365)
mcimadamore@1393:                     bestSoFar = concrete;
mcimadamore@1393:                 }
duke@1:             }
duke@1:         }
duke@1:         return bestSoFar;
duke@1:     }
duke@1: 
mcimadamore@1393:     enum InterfaceLookupPhase {
mcimadamore@1393:         ABSTRACT_OK() {
mcimadamore@1393:             @Override
mcimadamore@1393:             InterfaceLookupPhase update(Symbol s, Resolve rs) {
mcimadamore@1393:                 //We should not look for abstract methods if receiver is a concrete class
mcimadamore@1393:                 //(as concrete classes are expected to implement all abstracts coming
mcimadamore@1393:                 //from superinterfaces)
mcimadamore@1393:                 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
mcimadamore@1393:                     return this;
mcimadamore@1393:                 } else if (rs.allowDefaultMethods) {
mcimadamore@1393:                     return DEFAULT_OK;
mcimadamore@1393:                 } else {
mcimadamore@1393:                     return null;
mcimadamore@1393:                 }
mcimadamore@1393:             }
mcimadamore@1393:         },
mcimadamore@1393:         DEFAULT_OK() {
mcimadamore@1393:             @Override
mcimadamore@1393:             InterfaceLookupPhase update(Symbol s, Resolve rs) {
mcimadamore@1393:                 return this;
mcimadamore@1393:             }
mcimadamore@1393:         };
mcimadamore@1393: 
mcimadamore@1393:         abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
mcimadamore@1393:     }
mcimadamore@1393: 
mcimadamore@1335:     /**
mcimadamore@1335:      * Return an Iterable object to scan the superclasses of a given type.
mcimadamore@1335:      * It's crucial that the scan is done lazily, as we don't want to accidentally
mcimadamore@1335:      * access more supertypes than strictly needed (as this could trigger completion
mcimadamore@1335:      * errors if some of the not-needed supertypes are missing/ill-formed).
mcimadamore@1335:      */
mcimadamore@1335:     Iterable<TypeSymbol> superclasses(final Type intype) {
mcimadamore@1335:         return new Iterable<TypeSymbol>() {
mcimadamore@1335:             public Iterator<TypeSymbol> iterator() {
mcimadamore@1335:                 return new Iterator<TypeSymbol>() {
mcimadamore@1335: 
mcimadamore@1335:                     List<TypeSymbol> seen = List.nil();
mcimadamore@1342:                     TypeSymbol currentSym = symbolFor(intype);
mcimadamore@1342:                     TypeSymbol prevSym = null;
mcimadamore@1335: 
mcimadamore@1335:                     public boolean hasNext() {
mcimadamore@1342:                         if (currentSym == syms.noSymbol) {
mcimadamore@1342:                             currentSym = symbolFor(types.supertype(prevSym.type));
mcimadamore@1342:                         }
mcimadamore@1335:                         return currentSym != null;
mcimadamore@1335:                     }
mcimadamore@1335: 
mcimadamore@1335:                     public TypeSymbol next() {
mcimadamore@1342:                         prevSym = currentSym;
mcimadamore@1342:                         currentSym = syms.noSymbol;
mcimadamore@1342:                         Assert.check(prevSym != null || prevSym != syms.noSymbol);
mcimadamore@1335:                         return prevSym;
mcimadamore@1335:                     }
mcimadamore@1335: 
mcimadamore@1335:                     public void remove() {
mcimadamore@1342:                         throw new UnsupportedOperationException();
mcimadamore@1335:                     }
mcimadamore@1335: 
mcimadamore@1342:                     TypeSymbol symbolFor(Type t) {
jjg@1374:                         if (!t.hasTag(CLASS) &&
jjg@1374:                                 !t.hasTag(TYPEVAR)) {
mcimadamore@1335:                             return null;
mcimadamore@1335:                         }
jjg@1374:                         while (t.hasTag(TYPEVAR))
mcimadamore@1342:                             t = t.getUpperBound();
mcimadamore@1342:                         if (seen.contains(t.tsym)) {
mcimadamore@1335:                             //degenerate case in which we have a circular
mcimadamore@1335:                             //class hierarchy - because of ill-formed classfiles
mcimadamore@1335:                             return null;
mcimadamore@1335:                         }
mcimadamore@1342:                         seen = seen.prepend(t.tsym);
mcimadamore@1342:                         return t.tsym;
mcimadamore@1335:                     }
mcimadamore@1335:                 };
mcimadamore@1335:             }
mcimadamore@1335:         };
mcimadamore@1335:     }
mcimadamore@1335: 
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);
jjg@1374:         if (st != null && st.hasTag(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 &&
jjg@1374:                         e.sym.type.hasTag(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 &&
jjg@1374:                 sym.type.hasTag(CLASS) &&
jjg@1374:                 sym.type.getEnclosingType().hasTag(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.
jjg@1409:      *  @param name      The identifier'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);
ohrstrom@1460:             if (sym.kind==TYP) {
ohrstrom@1460:                  reportDependence(env.enclClass.sym, sym);
ohrstrom@1460:             }
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: 
ohrstrom@1460:     /** Report dependencies.
ohrstrom@1460:      * @param from The enclosing class sym
ohrstrom@1460:      * @param to   The found identifier that the class depends on.
ohrstrom@1460:      */
ohrstrom@1460:     public void reportDependence(Symbol from, Symbol to) {
ohrstrom@1460:         // Override if you want to collect the reported dependencies.
ohrstrom@1460:     }
ohrstrom@1460: 
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
jjg@1326:      *  symbol {@literal (--> 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.
mcimadamore@1347:      *  @param location  The symbol the served as a context for this lookup
duke@1:      *  @param site      The original type from where the selection took place.
duke@1:      *  @param name      The symbol's name.
mcimadamore@1347:      *  @param qualified Did we get here through a qualified expression resolution?
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.
mcimadamore@1347:      *  @param logResolveHelper helper class used to log resolve errors
duke@1:      */
mcimadamore@1347:     Symbol accessInternal(Symbol sym,
mcimadamore@1347:                   DiagnosticPosition pos,
mcimadamore@1347:                   Symbol location,
mcimadamore@1347:                   Type site,
mcimadamore@1347:                   Name name,
mcimadamore@1347:                   boolean qualified,
mcimadamore@1347:                   List<Type> argtypes,
mcimadamore@1347:                   List<Type> typeargtypes,
mcimadamore@1347:                   LogResolveHelper logResolveHelper) {
mcimadamore@1347:         if (sym.kind >= AMBIGUOUS) {
mcimadamore@1347:             ResolveError errSym = (ResolveError)sym;
mcimadamore@1347:             sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
mcimadamore@1347:             argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
mcimadamore@1347:             if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
mcimadamore@1347:                 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
mcimadamore@1347:             }
mcimadamore@1347:         }
mcimadamore@1347:         return sym;
mcimadamore@1347:     }
mcimadamore@1347: 
mcimadamore@1347:     /**
mcimadamore@1347:      * Variant of the generalized access routine, to be used for generating method
mcimadamore@1347:      * resolution diagnostics
mcimadamore@1347:      */
mcimadamore@1347:     Symbol accessMethod(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) {
mcimadamore@1347:         return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
duke@1:     }
duke@1: 
mcimadamore@1347:     /** Same as original accessMethod(), but without location.
mcimadamore@829:      */
mcimadamore@1347:     Symbol accessMethod(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@1347:         return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
mcimadamore@829:     }
mcimadamore@829: 
mcimadamore@1347:     /**
mcimadamore@1347:      * Variant of the generalized access routine, to be used for generating variable,
mcimadamore@1347:      * type resolution diagnostics
mcimadamore@829:      */
mcimadamore@1347:     Symbol accessBase(Symbol sym,
mcimadamore@829:                   DiagnosticPosition pos,
mcimadamore@829:                   Symbol location,
mcimadamore@829:                   Type site,
mcimadamore@829:                   Name name,
mcimadamore@829:                   boolean qualified) {
mcimadamore@1347:         return accessInternal(sym, pos, location, site, name, qualified, List.<Type>nil(), null, basicLogResolveHelper);
mcimadamore@829:     }
mcimadamore@829: 
mcimadamore@1347:     /** Same as original accessBase(), but without location.
duke@1:      */
mcimadamore@1347:     Symbol accessBase(Symbol sym,
duke@1:                   DiagnosticPosition pos,
duke@1:                   Type site,
duke@1:                   Name name,
duke@1:                   boolean qualified) {
mcimadamore@1347:         return accessBase(sym, pos, site.tsym, site, name, qualified);
duke@1:     }
duke@1: 
mcimadamore@1347:     interface LogResolveHelper {
mcimadamore@1347:         boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
mcimadamore@1347:         List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
mcimadamore@1347:     }
mcimadamore@1347: 
mcimadamore@1347:     LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
mcimadamore@1347:         public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1347:             return !site.isErroneous();
mcimadamore@1347:         }
mcimadamore@1347:         public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
mcimadamore@1347:             return argtypes;
mcimadamore@1347:         }
mcimadamore@1347:     };
mcimadamore@1347: 
mcimadamore@1347:     LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
mcimadamore@1347:         public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1347:             return !site.isErroneous() &&
mcimadamore@1347:                         !Type.isErroneous(argtypes) &&
mcimadamore@1347:                         (typeargtypes == null || !Type.isErroneous(typeargtypes));
mcimadamore@1347:         }
mcimadamore@1347:         public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
mcimadamore@1415:             return (syms.operatorNames.contains(name)) ?
mcimadamore@1415:                     argtypes :
mcimadamore@1415:                     Type.map(argtypes, new ResolveDeferredRecoveryMap(accessedSym));
mcimadamore@1415:         }
mcimadamore@1415: 
mcimadamore@1415:         class ResolveDeferredRecoveryMap extends DeferredAttr.RecoveryDeferredTypeMap {
mcimadamore@1415: 
mcimadamore@1415:             public ResolveDeferredRecoveryMap(Symbol msym) {
mcimadamore@1415:                 deferredAttr.super(AttrMode.SPECULATIVE, msym, currentResolutionContext.step);
mcimadamore@1415:             }
mcimadamore@1415: 
mcimadamore@1415:             @Override
mcimadamore@1415:             protected Type typeOf(DeferredType dt) {
mcimadamore@1415:                 Type res = super.typeOf(dt);
mcimadamore@1415:                 if (!res.isErroneous()) {
mcimadamore@1415:                     switch (TreeInfo.skipParens(dt.tree).getTag()) {
mcimadamore@1415:                         case LAMBDA:
mcimadamore@1415:                         case REFERENCE:
mcimadamore@1415:                             return dt;
mcimadamore@1415:                         case CONDEXPR:
mcimadamore@1415:                             return res == Type.recoveryType ?
mcimadamore@1415:                                     dt : res;
mcimadamore@1347:                     }
mcimadamore@1347:                 }
mcimadamore@1415:                 return res;
mcimadamore@1347:             }
mcimadamore@1347:         }
mcimadamore@1347:     };
mcimadamore@1347: 
duke@1:     /** Check that sym is not an abstract method.
duke@1:      */
duke@1:     void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
mcimadamore@1393:         if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 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) {
jjg@1374:         while (t.hasTag(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) {
mcimadamore@1347:         return accessBase(
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@1396:         return lookupMethod(env, pos, env.enclClass.sym, new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1394:                 return findFun(env, name, argtypes, typeargtypes,
mcimadamore@1394:                         phase.isBoxingRequired(),
mcimadamore@1394:                         phase.isVarargsRequired());
mcimadamore@1215:             }
mcimadamore@1394:         });
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@1394:         return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1394:                 return findMethod(env, site, name, argtypes, typeargtypes,
mcimadamore@1394:                         phase.isBoxingRequired(),
mcimadamore@1394:                         phase.isVarargsRequired(), false);
mcimadamore@1215:             }
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
mcimadamore@1394:                 if (sym.kind >= AMBIGUOUS) {
mcimadamore@1394:                     sym = super.access(env, pos, location, sym);
mcimadamore@1394:                 } else if (allowMethodHandles) {
mcimadamore@1394:                     MethodSymbol msym = (MethodSymbol)sym;
mcimadamore@1394:                     if (msym.isSignaturePolymorphic(types)) {
mcimadamore@1394:                         return findPolymorphicSignatureInstance(env, sym, argtypes);
mcimadamore@1394:                     }
mcimadamore@1215:                 }
mcimadamore@1394:                 return sym;
mcimadamore@674:             }
mcimadamore@1394:         });
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@1239:      *  @param spMethod  signature polymorphic method - i.e. MH.invokeExact
mcimadamore@1239:      *  @param argtypes  The required argument types
mcimadamore@674:      */
mcimadamore@1239:     Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
mcimadamore@1415:                                             final Symbol spMethod,
mcimadamore@820:                                             List<Type> argtypes) {
mcimadamore@674:         Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
mcimadamore@1347:                 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
mcimadamore@1239:         for (Symbol sym : polymorphicSignatureScope.getElementsByName(spMethod.name)) {
mcimadamore@1239:             if (types.isSameType(mtype, sym.type)) {
mcimadamore@1239:                return sym;
mcimadamore@674:             }
mcimadamore@674:         }
mcimadamore@1239: 
mcimadamore@1239:         // create the desired method
mcimadamore@1239:         long flags = ABSTRACT | HYPOTHETICAL | spMethod.flags() & Flags.AccessFlags;
mcimadamore@1415:         Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner) {
mcimadamore@1415:             @Override
mcimadamore@1415:             public Symbol baseSymbol() {
mcimadamore@1415:                 return spMethod;
mcimadamore@1415:             }
mcimadamore@1415:         };
mcimadamore@1239:         polymorphicSignatureScope.enter(msym);
mcimadamore@1239:         return msym;
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@1394: 
mcimadamore@1215:     private Symbol resolveConstructor(MethodResolutionContext resolveContext,
mcimadamore@1394:                               final DiagnosticPosition pos,
mcimadamore@1215:                               Env<AttrContext> env,
mcimadamore@1215:                               Type site,
mcimadamore@1215:                               List<Type> argtypes,
mcimadamore@1215:                               List<Type> typeargtypes) {
mcimadamore@1394:         return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1394:                 return findConstructor(pos, env, site, argtypes, typeargtypes,
mcimadamore@1394:                         phase.isBoxingRequired(),
mcimadamore@1394:                         phase.isVarargsRequired());
mcimadamore@1215:             }
mcimadamore@1394:         });
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     /** Resolve a constructor, throw a fatal error if not found.
mcimadamore@1394:      *  @param pos       The position to use for error reporting.
mcimadamore@1394:      *  @param env       The environment current at the method invocation.
mcimadamore@1394:      *  @param site      The type to be constructed.
mcimadamore@1394:      *  @param argtypes  The types of the invocation's value arguments.
mcimadamore@1394:      *  @param typeargtypes  The types of the invocation's type arguments.
mcimadamore@1394:      */
mcimadamore@1394:     public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
mcimadamore@1394:                                         Type site,
mcimadamore@1394:                                         List<Type> argtypes,
mcimadamore@1394:                                         List<Type> typeargtypes) {
mcimadamore@1394:         MethodResolutionContext resolveContext = new MethodResolutionContext();
mcimadamore@1394:         resolveContext.internalResolution = true;
mcimadamore@1394:         Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
mcimadamore@1394:         if (sym.kind == MTH) return (MethodSymbol)sym;
mcimadamore@1394:         else throw new FatalError(
mcimadamore@1394:                  diags.fragment("fatal.err.cant.locate.ctor", site));
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
mcimadamore@1394:                               Type site, List<Type> argtypes,
mcimadamore@1394:                               List<Type> typeargtypes,
mcimadamore@1394:                               boolean allowBoxing,
mcimadamore@1394:                               boolean useVarargs) {
mcimadamore@1394:         Symbol sym = findMethod(env, site,
mcimadamore@1394:                                     names.init, argtypes,
mcimadamore@1394:                                     typeargtypes, allowBoxing,
mcimadamore@1394:                                     useVarargs, false);
mcimadamore@1394:         chk.checkDeprecated(pos, env.info.scope.owner, sym);
mcimadamore@1394:         return sym;
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@1394:         return lookupMethod(env, pos, site.tsym, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1394:                 return findDiamond(env, site, argtypes, typeargtypes,
mcimadamore@1394:                         phase.isBoxingRequired(),
mcimadamore@1394:                         phase.isVarargsRequired());
mcimadamore@1215:             }
mcimadamore@1394:             @Override
mcimadamore@1394:             Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
mcimadamore@1394:                 if (sym.kind >= AMBIGUOUS) {
mcimadamore@1394:                     final JCDiagnostic details = sym.kind == WRONG_MTH ?
mcimadamore@1394:                                     ((InapplicableSymbolError)sym).errCandidate().details :
mcimadamore@1394:                                     null;
mcimadamore@1394:                     sym = new InapplicableSymbolError(sym.kind, "diamondError", currentResolutionContext) {
mcimadamore@1394:                         @Override
mcimadamore@1394:                         JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
mcimadamore@1394:                                 Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1394:                             String key = details == null ?
mcimadamore@1394:                                 "cant.apply.diamond" :
mcimadamore@1394:                                 "cant.apply.diamond.1";
mcimadamore@1394:                             return diags.create(dkind, log.currentSource(), pos, key,
mcimadamore@1394:                                     diags.fragment("diamond", site.tsym), details);
mcimadamore@1394:                         }
mcimadamore@1394:                     };
mcimadamore@1394:                     sym = accessMethod(sym, pos, site, names.init, true, argtypes, typeargtypes);
mcimadamore@1394:                     env.info.pendingResolutionPhase = currentResolutionContext.step;
mcimadamore@1394:                 }
mcimadamore@1394:                 return sym;
mcimadamore@1215:             }
mcimadamore@1394:         });
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:
jjg@1326:      *  {@code 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:
jjg@1326:      *  {@code <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@1341:             final Symbol sym = e.sym;
mcimadamore@1217:             //- System.out.println(" e " + e.sym);
mcimadamore@1341:             if (sym.kind == MTH &&
mcimadamore@1341:                 (sym.flags_field & SYNTHETIC) == 0) {
jjg@1374:                     List<Type> oldParams = e.sym.type.hasTag(FORALL) ?
mcimadamore@1341:                             ((ForAll)sym.type).tvars :
mcimadamore@1217:                             List.<Type>nil();
mcimadamore@1217:                     Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
mcimadamore@1341:                             types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
mcimadamore@1341:                     MethodSymbol newConstr = new MethodSymbol(sym.flags(), names.init, constrType, site.tsym) {
mcimadamore@1341:                         @Override
mcimadamore@1341:                         public Symbol baseSymbol() {
mcimadamore@1341:                             return sym;
mcimadamore@1341:                         }
mcimadamore@1341:                     };
mcimadamore@1217:                     bestSoFar = selectBest(env, site, argtypes, typeargtypes,
mcimadamore@1341:                             newConstr,
mcimadamore@1217:                             bestSoFar,
mcimadamore@1217:                             allowBoxing,
mcimadamore@1217:                             useVarargs,
mcimadamore@1217:                             false);
mcimadamore@1217:             }
mcimadamore@1217:         }
mcimadamore@1217:         return bestSoFar;
mcimadamore@1217:     }
mcimadamore@1217: 
mcimadamore@1394: 
mcimadamore@1394: 
mcimadamore@1394:     /** Resolve operator.
mcimadamore@1394:      *  @param pos       The position to use for error reporting.
mcimadamore@1394:      *  @param optag     The tag of the operation tree.
mcimadamore@1394:      *  @param env       The environment current at the operation.
mcimadamore@1394:      *  @param argtypes  The types of the operands.
mcimadamore@1394:      */
mcimadamore@1394:     Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
mcimadamore@1394:                            Env<AttrContext> env, List<Type> argtypes) {
mcimadamore@1394:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1394:         try {
mcimadamore@1394:             currentResolutionContext = new MethodResolutionContext();
mcimadamore@1394:             Name name = treeinfo.operatorName(optag);
mcimadamore@1479:             env.info.pendingResolutionPhase = currentResolutionContext.step = BASIC;
mcimadamore@1394:             Symbol sym = findMethod(env, syms.predefClass.type, name, argtypes,
mcimadamore@1394:                                     null, false, false, true);
mcimadamore@1394:             if (boxingEnabled && sym.kind >= WRONG_MTHS)
mcimadamore@1479:                 env.info.pendingResolutionPhase = currentResolutionContext.step = BOX;
mcimadamore@1394:                 sym = findMethod(env, syms.predefClass.type, name, argtypes,
mcimadamore@1394:                                  null, true, false, true);
mcimadamore@1394:             return accessMethod(sym, pos, env.enclClass.sym.type, name,
mcimadamore@1394:                           false, argtypes, null);
mcimadamore@1394:         }
mcimadamore@1394:         finally {
mcimadamore@1394:             currentResolutionContext = prevResolutionContext;
mcimadamore@1394:         }
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     /** Resolve operator.
mcimadamore@1394:      *  @param pos       The position to use for error reporting.
mcimadamore@1394:      *  @param optag     The tag of the operation tree.
mcimadamore@1394:      *  @param env       The environment current at the operation.
mcimadamore@1394:      *  @param arg       The type of the operand.
mcimadamore@1394:      */
mcimadamore@1394:     Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
mcimadamore@1394:         return resolveOperator(pos, optag, env, List.of(arg));
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     /** Resolve binary operator.
mcimadamore@1394:      *  @param pos       The position to use for error reporting.
mcimadamore@1394:      *  @param optag     The tag of the operation tree.
mcimadamore@1394:      *  @param env       The environment current at the operation.
mcimadamore@1394:      *  @param left      The types of the left operand.
mcimadamore@1394:      *  @param right     The types of the right operand.
mcimadamore@1394:      */
mcimadamore@1394:     Symbol resolveBinaryOperator(DiagnosticPosition pos,
mcimadamore@1394:                                  JCTree.Tag optag,
mcimadamore@1394:                                  Env<AttrContext> env,
mcimadamore@1394:                                  Type left,
mcimadamore@1394:                                  Type right) {
mcimadamore@1394:         return resolveOperator(pos, optag, env, List.of(left, right));
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1352:     /**
mcimadamore@1352:      * Resolution of member references is typically done as a single
mcimadamore@1352:      * overload resolution step, where the argument types A are inferred from
mcimadamore@1352:      * the target functional descriptor.
mcimadamore@1352:      *
mcimadamore@1352:      * If the member reference is a method reference with a type qualifier,
mcimadamore@1352:      * a two-step lookup process is performed. The first step uses the
mcimadamore@1352:      * expected argument list A, while the second step discards the first
mcimadamore@1352:      * type from A (which is treated as a receiver type).
mcimadamore@1352:      *
mcimadamore@1352:      * There are two cases in which inference is performed: (i) if the member
mcimadamore@1352:      * reference is a constructor reference and the qualifier type is raw - in
mcimadamore@1352:      * which case diamond inference is used to infer a parameterization for the
mcimadamore@1352:      * type qualifier; (ii) if the member reference is an unbound reference
mcimadamore@1352:      * where the type qualifier is raw - in that case, during the unbound lookup
mcimadamore@1352:      * the receiver argument type is used to infer an instantiation for the raw
mcimadamore@1352:      * qualifier type.
mcimadamore@1352:      *
mcimadamore@1352:      * When a multi-step resolution process is exploited, it is an error
mcimadamore@1352:      * if two candidates are found (ambiguity).
mcimadamore@1352:      *
mcimadamore@1352:      * This routine returns a pair (T,S), where S is the member reference symbol,
mcimadamore@1352:      * and T is the type of the class in which S is defined. This is necessary as
mcimadamore@1352:      * the type T might be dynamically inferred (i.e. if constructor reference
mcimadamore@1352:      * has a raw qualifier).
mcimadamore@1352:      */
mcimadamore@1352:     Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(DiagnosticPosition pos,
mcimadamore@1352:                                   Env<AttrContext> env,
mcimadamore@1352:                                   JCMemberReference referenceTree,
mcimadamore@1352:                                   Type site,
mcimadamore@1352:                                   Name name, List<Type> argtypes,
mcimadamore@1352:                                   List<Type> typeargtypes,
mcimadamore@1352:                                   boolean boxingAllowed) {
mcimadamore@1394:         MethodResolutionPhase maxPhase = boxingAllowed ? VARARITY : BASIC;
mcimadamore@1496: 
mcimadamore@1496:         ReferenceLookupHelper boundLookupHelper;
mcimadamore@1496:         if (!name.equals(names.init)) {
mcimadamore@1496:             //method reference
mcimadamore@1496:             boundLookupHelper =
mcimadamore@1496:                     new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1496:         } else if (site.hasTag(ARRAY)) {
mcimadamore@1496:             //array constructor reference
mcimadamore@1496:             boundLookupHelper =
mcimadamore@1496:                     new ArrayConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1496:         } else {
mcimadamore@1496:             //class constructor reference
mcimadamore@1496:             boundLookupHelper =
mcimadamore@1496:                     new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1496:         }
mcimadamore@1496: 
mcimadamore@1352:         //step 1 - bound lookup
mcimadamore@1352:         Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
mcimadamore@1394:         Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(), site.tsym, boundLookupHelper);
mcimadamore@1352: 
mcimadamore@1352:         //step 2 - unbound lookup
mcimadamore@1352:         ReferenceLookupHelper unboundLookupHelper = boundLookupHelper.unboundLookup();
mcimadamore@1352:         Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
mcimadamore@1394:         Symbol unboundSym = lookupMethod(unboundEnv, env.tree.pos(), site.tsym, unboundLookupHelper);
mcimadamore@1352: 
mcimadamore@1352:         //merge results
mcimadamore@1352:         Pair<Symbol, ReferenceLookupHelper> res;
mcimadamore@1352:         if (unboundSym.kind != MTH) {
mcimadamore@1352:             res = new Pair<Symbol, ReferenceLookupHelper>(boundSym, boundLookupHelper);
mcimadamore@1352:             env.info.pendingResolutionPhase = boundEnv.info.pendingResolutionPhase;
mcimadamore@1352:         } else if (boundSym.kind == MTH) {
mcimadamore@1352:             res = new Pair<Symbol, ReferenceLookupHelper>(ambiguityError(boundSym, unboundSym), boundLookupHelper);
mcimadamore@1352:             env.info.pendingResolutionPhase = boundEnv.info.pendingResolutionPhase;
mcimadamore@1352:         } else {
mcimadamore@1352:             res = new Pair<Symbol, ReferenceLookupHelper>(unboundSym, unboundLookupHelper);
mcimadamore@1352:             env.info.pendingResolutionPhase = unboundEnv.info.pendingResolutionPhase;
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         return res;
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1352:      * Helper for defining custom method-like lookup logic; a lookup helper
mcimadamore@1352:      * provides hooks for (i) the actual lookup logic and (ii) accessing the
mcimadamore@1352:      * lookup result (this step might result in compiler diagnostics to be generated)
mcimadamore@1352:      */
mcimadamore@1352:     abstract class LookupHelper {
mcimadamore@1352: 
mcimadamore@1352:         /** name of the symbol to lookup */
mcimadamore@1352:         Name name;
mcimadamore@1352: 
mcimadamore@1352:         /** location in which the lookup takes place */
mcimadamore@1352:         Type site;
mcimadamore@1352: 
mcimadamore@1352:         /** actual types used during the lookup */
mcimadamore@1352:         List<Type> argtypes;
mcimadamore@1352: 
mcimadamore@1352:         /** type arguments used during the lookup */
mcimadamore@1352:         List<Type> typeargtypes;
mcimadamore@1352: 
mcimadamore@1394:         /** Max overload resolution phase handled by this helper */
mcimadamore@1394:         MethodResolutionPhase maxPhase;
mcimadamore@1394: 
mcimadamore@1394:         LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1352:             this.name = name;
mcimadamore@1352:             this.site = site;
mcimadamore@1352:             this.argtypes = argtypes;
mcimadamore@1352:             this.typeargtypes = typeargtypes;
mcimadamore@1394:             this.maxPhase = maxPhase;
mcimadamore@1394:         }
mcimadamore@1394: 
mcimadamore@1394:         /**
mcimadamore@1394:          * Should lookup stop at given phase with given result
mcimadamore@1394:          */
mcimadamore@1394:         protected boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
mcimadamore@1394:             return phase.ordinal() > maxPhase.ordinal() ||
mcimadamore@1394:                     sym.kind < ERRONEOUS || sym.kind == AMBIGUOUS;
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         /**
mcimadamore@1352:          * Search for a symbol under a given overload resolution phase - this method
mcimadamore@1352:          * is usually called several times, once per each overload resolution phase
mcimadamore@1352:          */
mcimadamore@1352:         abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
mcimadamore@1352: 
mcimadamore@1352:         /**
mcimadamore@1352:          * Validate the result of the lookup
mcimadamore@1352:          */
mcimadamore@1394:         abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     abstract class BasicLookupHelper extends LookupHelper {
mcimadamore@1394: 
mcimadamore@1394:         BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1394:             super(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
mcimadamore@1394:         }
mcimadamore@1394: 
mcimadamore@1394:         @Override
mcimadamore@1394:         Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
mcimadamore@1480:             if (sym.kind == AMBIGUOUS) {
mcimadamore@1480:                 AmbiguityError a_err = (AmbiguityError)sym;
mcimadamore@1480:                 sym = a_err.mergeAbstracts(site);
mcimadamore@1480:             }
mcimadamore@1394:             if (sym.kind >= AMBIGUOUS) {
mcimadamore@1394:                 //if nothing is found return the 'first' error
mcimadamore@1394:                 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
mcimadamore@1394:             }
mcimadamore@1394:             return sym;
mcimadamore@1394:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1352:      * Helper class for member reference lookup. A reference lookup helper
mcimadamore@1352:      * defines the basic logic for member reference lookup; a method gives
mcimadamore@1352:      * access to an 'unbound' helper used to perform an unbound member
mcimadamore@1352:      * reference lookup.
mcimadamore@1352:      */
mcimadamore@1352:     abstract class ReferenceLookupHelper extends LookupHelper {
mcimadamore@1352: 
mcimadamore@1352:         /** The member reference tree */
mcimadamore@1352:         JCMemberReference referenceTree;
mcimadamore@1352: 
mcimadamore@1352:         ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
mcimadamore@1394:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1394:             super(name, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1352:             this.referenceTree = referenceTree;
mcimadamore@1394: 
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         /**
mcimadamore@1352:          * Returns an unbound version of this lookup helper. By default, this
mcimadamore@1352:          * method returns an dummy lookup helper.
mcimadamore@1352:          */
mcimadamore@1352:         ReferenceLookupHelper unboundLookup() {
mcimadamore@1352:             //dummy loopkup helper that always return 'methodNotFound'
mcimadamore@1394:             return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
mcimadamore@1352:                 @Override
mcimadamore@1352:                 ReferenceLookupHelper unboundLookup() {
mcimadamore@1352:                     return this;
mcimadamore@1352:                 }
mcimadamore@1352:                 @Override
mcimadamore@1394:                 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1352:                     return methodNotFound;
mcimadamore@1352:                 }
mcimadamore@1352:                 @Override
mcimadamore@1352:                 ReferenceKind referenceKind(Symbol sym) {
mcimadamore@1352:                     Assert.error();
mcimadamore@1352:                     return null;
mcimadamore@1352:                 }
mcimadamore@1352:             };
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         /**
mcimadamore@1352:          * Get the kind of the member reference
mcimadamore@1352:          */
mcimadamore@1352:         abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
mcimadamore@1352: 
mcimadamore@1394:         Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
mcimadamore@1480:             if (sym.kind == AMBIGUOUS) {
mcimadamore@1480:                 AmbiguityError a_err = (AmbiguityError)sym;
mcimadamore@1480:                 sym = a_err.mergeAbstracts(site);
mcimadamore@1480:             }
mcimadamore@1394:             //skip error reporting
mcimadamore@1352:             return sym;
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1352:      * Helper class for method reference lookup. The lookup logic is based
mcimadamore@1352:      * upon Resolve.findMethod; in certain cases, this helper class has a
mcimadamore@1352:      * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
mcimadamore@1352:      * In such cases, non-static lookup results are thrown away.
mcimadamore@1352:      */
mcimadamore@1352:     class MethodReferenceLookupHelper extends ReferenceLookupHelper {
mcimadamore@1352: 
mcimadamore@1352:         MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
mcimadamore@1394:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1394:             super(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         protected Symbol lookupReferenceInternal(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1352:             return findMethod(env, site, name, argtypes, typeargtypes,
mcimadamore@1352:                     phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         protected Symbol adjustLookupResult(Env<AttrContext> env, Symbol sym) {
mcimadamore@1352:             return !TreeInfo.isStaticSelector(referenceTree.expr, names) ||
mcimadamore@1352:                         sym.kind != MTH ||
mcimadamore@1352:                         sym.isStatic() ? sym : new StaticError(sym);
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1394:         final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1352:             return adjustLookupResult(env, lookupReferenceInternal(env, phase));
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         ReferenceLookupHelper unboundLookup() {
mcimadamore@1352:             if (TreeInfo.isStaticSelector(referenceTree.expr, names) &&
mcimadamore@1352:                     argtypes.nonEmpty() &&
mcimadamore@1352:                     types.isSubtypeUnchecked(argtypes.head, site)) {
mcimadamore@1352:                 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
mcimadamore@1394:                         site, argtypes, typeargtypes, maxPhase);
mcimadamore@1352:             } else {
mcimadamore@1352:                 return super.unboundLookup();
mcimadamore@1352:             }
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         ReferenceKind referenceKind(Symbol sym) {
mcimadamore@1352:             if (sym.isStatic()) {
mcimadamore@1435:                 return ReferenceKind.STATIC;
mcimadamore@1352:             } else {
mcimadamore@1352:                 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
mcimadamore@1352:                 return selName != null && selName == names._super ?
mcimadamore@1352:                         ReferenceKind.SUPER :
mcimadamore@1352:                         ReferenceKind.BOUND;
mcimadamore@1352:             }
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1352:      * Helper class for unbound method reference lookup. Essentially the same
mcimadamore@1352:      * as the basic method reference lookup helper; main difference is that static
mcimadamore@1352:      * lookup results are thrown away. If qualifier type is raw, an attempt to
mcimadamore@1352:      * infer a parameterized type is made using the first actual argument (that
mcimadamore@1352:      * would otherwise be ignored during the lookup).
mcimadamore@1352:      */
mcimadamore@1352:     class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
mcimadamore@1352: 
mcimadamore@1352:         UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
mcimadamore@1394:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1352:             super(referenceTree, name,
mcimadamore@1352:                     site.isRaw() ? types.asSuper(argtypes.head, site.tsym) : site,
mcimadamore@1394:                     argtypes.tail, typeargtypes, maxPhase);
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         protected Symbol adjustLookupResult(Env<AttrContext> env, Symbol sym) {
mcimadamore@1352:             return sym.kind != MTH || !sym.isStatic() ? sym : new StaticError(sym);
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         ReferenceLookupHelper unboundLookup() {
mcimadamore@1352:             return this;
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         ReferenceKind referenceKind(Symbol sym) {
mcimadamore@1352:             return ReferenceKind.UNBOUND;
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1496:      * Helper class for array constructor lookup; an array constructor lookup
mcimadamore@1496:      * is simulated by looking up a method that returns the array type specified
mcimadamore@1496:      * as qualifier, and that accepts a single int parameter (size of the array).
mcimadamore@1496:      */
mcimadamore@1496:     class ArrayConstructorReferenceLookupHelper extends ReferenceLookupHelper {
mcimadamore@1496: 
mcimadamore@1496:         ArrayConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
mcimadamore@1496:                 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1496:             super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1496:         }
mcimadamore@1496: 
mcimadamore@1496:         @Override
mcimadamore@1496:         protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1496:             Scope sc = new Scope(syms.arrayClass);
mcimadamore@1496:             MethodSymbol arrayConstr = new MethodSymbol(PUBLIC, name, null, site.tsym);
mcimadamore@1496:             arrayConstr.type = new MethodType(List.of(syms.intType), site, List.<Type>nil(), syms.methodClass);
mcimadamore@1496:             sc.enter(arrayConstr);
mcimadamore@1496:             return findMethodInScope(env, site, name, argtypes, typeargtypes, sc, methodNotFound, phase.isBoxingRequired(), phase.isVarargsRequired(), false, false);
mcimadamore@1496:         }
mcimadamore@1496: 
mcimadamore@1496:         @Override
mcimadamore@1496:         ReferenceKind referenceKind(Symbol sym) {
mcimadamore@1496:             return ReferenceKind.ARRAY_CTOR;
mcimadamore@1496:         }
mcimadamore@1496:     }
mcimadamore@1496: 
mcimadamore@1496:     /**
mcimadamore@1352:      * Helper class for constructor reference lookup. The lookup logic is based
mcimadamore@1352:      * upon either Resolve.findMethod or Resolve.findDiamond - depending on
mcimadamore@1352:      * whether the constructor reference needs diamond inference (this is the case
mcimadamore@1352:      * if the qualifier type is raw). A special erroneous symbol is returned
mcimadamore@1352:      * if the lookup returns the constructor of an inner class and there's no
mcimadamore@1352:      * enclosing instance in scope.
mcimadamore@1352:      */
mcimadamore@1352:     class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
mcimadamore@1352: 
mcimadamore@1352:         boolean needsInference;
mcimadamore@1352: 
mcimadamore@1352:         ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
mcimadamore@1394:                 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
mcimadamore@1394:             super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
mcimadamore@1352:             if (site.isRaw()) {
mcimadamore@1352:                 this.site = new ClassType(site.getEnclosingType(), site.tsym.type.getTypeArguments(), site.tsym);
mcimadamore@1352:                 needsInference = true;
mcimadamore@1352:             }
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1394:         protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
mcimadamore@1352:             Symbol sym = needsInference ?
mcimadamore@1352:                 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
mcimadamore@1352:                 findMethod(env, site, name, argtypes, typeargtypes,
mcimadamore@1352:                         phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
mcimadamore@1352:             return sym.kind != MTH ||
jjg@1374:                           site.getEnclosingType().hasTag(NONE) ||
mcimadamore@1352:                           hasEnclosingInstance(env, site) ?
mcimadamore@1352:                           sym : new InvalidSymbolError(Kinds.MISSING_ENCL, sym, null) {
mcimadamore@1352:                     @Override
mcimadamore@1352:                     JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
mcimadamore@1352:                        return diags.create(dkind, log.currentSource(), pos,
mcimadamore@1352:                             "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
mcimadamore@1352:                     }
mcimadamore@1352:                 };
mcimadamore@1352:         }
mcimadamore@1352: 
mcimadamore@1352:         @Override
mcimadamore@1352:         ReferenceKind referenceKind(Symbol sym) {
jjg@1374:             return site.getEnclosingType().hasTag(NONE) ?
mcimadamore@1352:                     ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     /**
mcimadamore@1394:      * Main overload resolution routine. On each overload resolution step, a
mcimadamore@1394:      * lookup helper class is used to perform the method/constructor lookup;
mcimadamore@1394:      * at the end of the lookup, the helper is used to validate the results
mcimadamore@1394:      * (this last step might trigger overload resolution diagnostics).
mcimadamore@1352:      */
mcimadamore@1394:     Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, LookupHelper lookupHelper) {
mcimadamore@1394:         return lookupMethod(env, pos, location, new MethodResolutionContext(), lookupHelper);
mcimadamore@1394:     }
mcimadamore@1394: 
mcimadamore@1394:     Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
mcimadamore@1394:             MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
mcimadamore@1352:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
mcimadamore@1352:         try {
mcimadamore@1394:             Symbol bestSoFar = methodNotFound;
mcimadamore@1394:             currentResolutionContext = resolveContext;
mcimadamore@1394:             for (MethodResolutionPhase phase : methodResolutionSteps) {
mcimadamore@1394:                 if (!phase.isApplicable(boxingEnabled, varargsEnabled) ||
mcimadamore@1394:                         lookupHelper.shouldStop(bestSoFar, phase)) break;
mcimadamore@1394:                 MethodResolutionPhase prevPhase = currentResolutionContext.step;
mcimadamore@1394:                 Symbol prevBest = bestSoFar;
mcimadamore@1394:                 currentResolutionContext.step = phase;
mcimadamore@1394:                 bestSoFar = phase.mergeResults(bestSoFar, lookupHelper.lookup(env, phase));
mcimadamore@1394:                 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
mcimadamore@1352:             }
mcimadamore@1394:             return lookupHelper.access(env, pos, location, bestSoFar);
mcimadamore@1394:         } finally {
mcimadamore@1352:             currentResolutionContext = prevResolutionContext;
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
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);
mcimadamore@1347:                     return accessBase(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:         }
mcimadamore@1393:         if (allowDefaultMethods && c.isInterface() &&
mcimadamore@1393:                 name == names._super && !isStatic(env) &&
mcimadamore@1415:                 types.isDirectSuperInterface(c, env.enclClass.sym)) {
mcimadamore@1393:             //this might be a default super call if one of the superinterfaces is 'c'
mcimadamore@1393:             for (Type t : pruneInterfaces(env.enclClass.type)) {
mcimadamore@1393:                 if (t.tsym == c) {
mcimadamore@1393:                     env.info.defaultSuperCallSite = t;
mcimadamore@1393:                     return new VarSymbol(0, names._super,
mcimadamore@1393:                             types.asSuper(env.enclClass.type, c), env.enclClass.sym);
mcimadamore@1393:                 }
mcimadamore@1393:             }
mcimadamore@1393:             //find a direct superinterface that is a subtype of 'c'
mcimadamore@1393:             for (Type i : types.interfaces(env.enclClass.type)) {
mcimadamore@1393:                 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
mcimadamore@1393:                     log.error(pos, "illegal.default.super.call", c,
mcimadamore@1393:                             diags.fragment("redundant.supertype", c, i));
mcimadamore@1393:                     return syms.errSymbol;
mcimadamore@1393:                 }
mcimadamore@1393:             }
mcimadamore@1393:             Assert.error();
mcimadamore@1393:         }
duke@1:         log.error(pos, "not.encl.class", c);
duke@1:         return syms.errSymbol;
duke@1:     }
mcimadamore@1393:     //where
mcimadamore@1393:     private List<Type> pruneInterfaces(Type t) {
mcimadamore@1393:         ListBuffer<Type> result = ListBuffer.lb();
mcimadamore@1393:         for (Type t1 : types.interfaces(t)) {
mcimadamore@1393:             boolean shouldAdd = true;
mcimadamore@1393:             for (Type t2 : types.interfaces(t)) {
mcimadamore@1393:                 if (t1 != t2 && types.isSubtypeNoCapture(t2, t1)) {
mcimadamore@1393:                     shouldAdd = false;
mcimadamore@1393:                 }
mcimadamore@1393:             }
mcimadamore@1393:             if (shouldAdd) {
mcimadamore@1393:                 result.append(t1);
mcimadamore@1393:             }
mcimadamore@1393:         }
mcimadamore@1393:         return result.toList();
mcimadamore@1393:     }
mcimadamore@1393: 
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) {
mcimadamore@1352:         Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
mcimadamore@1352:         if (sym == null) {
mcimadamore@1352:             log.error(pos, "encl.class.required", member);
mcimadamore@1352:             return syms.errSymbol;
mcimadamore@1352:         } else {
mcimadamore@1352:             return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
mcimadamore@1352:         }
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     boolean hasEnclosingInstance(Env<AttrContext> env, Type type) {
mcimadamore@1352:         Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
mcimadamore@1352:         return encl != null && encl.kind < ERRONEOUS;
mcimadamore@1352:     }
mcimadamore@1352: 
mcimadamore@1352:     private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
mcimadamore@1352:                                  Symbol member,
mcimadamore@1352:                                  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@1352:                         return sym;
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:         }
mcimadamore@1352:         return null;
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: 
mcimadamore@1221:     //used by TransTypes when checking target type of synthetic cast
mcimadamore@1221:     public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
mcimadamore@1221:         AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
mcimadamore@1221:         logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, 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@1348:         if (argtypes == null || argtypes.isEmpty()) {
mcimadamore@1348:             return noArgs;
mcimadamore@1348:         } else {
mcimadamore@1348:             ListBuffer<Object> diagArgs = ListBuffer.lb();
mcimadamore@1348:             for (Type t : argtypes) {
jjg@1374:                 if (t.hasTag(DEFERRED)) {
mcimadamore@1348:                     diagArgs.append(((DeferredAttr.DeferredType)t).tree);
mcimadamore@1348:                 } else {
mcimadamore@1348:                     diagArgs.append(t);
mcimadamore@1348:                 }
mcimadamore@1348:             }
mcimadamore@1348:             return diagArgs;
mcimadamore@1348:         }
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@1352:     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:     }
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@1480:             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@1347:             if (syms.operatorNames.contains(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@1347:             boolean isConstructor = kind == ABSENT_MTH && name == 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@1456:                         typeargtypes, args(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@1456:                         typeargtypes, args(argtypes)); //type parameters and arguments (if any)
mcimadamore@302:             }
mcimadamore@302:         }
mcimadamore@302:         //where
mcimadamore@1456:         private Object args(List<Type> args) {
mcimadamore@1456:             return args.isEmpty() ? args : methodArguments(args);
mcimadamore@1456:         }
mcimadamore@1456: 
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@1352:         protected MethodResolutionContext resolveContext;
mcimadamore@1352: 
mcimadamore@1352:         InapplicableSymbolError(MethodResolutionContext context) {
mcimadamore@1352:             this(WRONG_MTH, "inapplicable symbol error", context);
mcimadamore@302:         }
mcimadamore@302: 
mcimadamore@1352:         protected InapplicableSymbolError(int kind, String debugName, MethodResolutionContext context) {
mcimadamore@1215:             super(kind, debugName);
mcimadamore@1352:             this.resolveContext = context;
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@1347:             if (syms.operatorNames.contains(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@1352:                           "cant.apply.symbol",
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:         private Candidate errCandidate() {
mcimadamore@1394:             Candidate bestSoFar = null;
mcimadamore@1352:             for (Candidate c : resolveContext.candidates) {
mcimadamore@1394:                 if (c.isApplicable()) continue;
mcimadamore@1394:                 bestSoFar = c;
mcimadamore@1215:             }
mcimadamore@1394:             Assert.checkNonNull(bestSoFar);
mcimadamore@1394:             return bestSoFar;
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@1352:         InapplicableSymbolsError(MethodResolutionContext context) {
mcimadamore@1352:             super(WRONG_MTHS, "inapplicable symbols", context);
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@1352:             if (!resolveContext.candidates.isEmpty()) {
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@1394:                         name == names.init ? site.tsym.name : name,
mcimadamore@1415:                         methodArguments(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@1394:             Map<Symbol, JCDiagnostic> details = new LinkedHashMap<Symbol, JCDiagnostic>();
mcimadamore@1352:             for (Candidate c : resolveContext.candidates) {
mcimadamore@1394:                 if (c.isApplicable()) 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@1394:                 details.put(c.sym, detailDiag);
mcimadamore@1215:             }
mcimadamore@1394:             return List.from(details.values());
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) {
jjg@1374:             if (sym.owner.type.hasTag(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) {
jjg@1374:             Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(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@1480:     class AmbiguityError extends ResolveError {
mcimadamore@302: 
mcimadamore@302:         /** The other maximally specific symbol */
mcimadamore@1480:         List<Symbol> ambiguousSyms = List.nil();
mcimadamore@1480: 
mcimadamore@1480:         @Override
mcimadamore@1480:         public boolean exists() {
mcimadamore@1480:             return true;
mcimadamore@1480:         }
duke@1: 
duke@1:         AmbiguityError(Symbol sym1, Symbol sym2) {
mcimadamore@1480:             super(AMBIGUOUS, "ambiguity error");
mcimadamore@1480:             ambiguousSyms = flatten(sym2).appendList(flatten(sym1));
mcimadamore@1480:         }
mcimadamore@1480: 
mcimadamore@1480:         private List<Symbol> flatten(Symbol sym) {
mcimadamore@1480:             if (sym.kind == AMBIGUOUS) {
mcimadamore@1480:                 return ((AmbiguityError)sym).ambiguousSyms;
mcimadamore@1480:             } else {
mcimadamore@1480:                 return List.of(sym);
mcimadamore@1480:             }
mcimadamore@1480:         }
mcimadamore@1480: 
mcimadamore@1480:         AmbiguityError addAmbiguousSymbol(Symbol s) {
mcimadamore@1480:             ambiguousSyms = ambiguousSyms.prepend(s);
mcimadamore@1480:             return this;
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@1480:             List<Symbol> diagSyms = ambiguousSyms.reverse();
mcimadamore@1480:             Symbol s1 = diagSyms.head;
mcimadamore@1480:             Symbol s2 = diagSyms.tail.head;
mcimadamore@1480:             Name sname = s1.name;
mcimadamore@1480:             if (sname == names.init) sname = s1.owner.name;
jjg@612:             return diags.create(dkind, log.currentSource(),
mcimadamore@302:                       pos, "ref.ambiguous", sname,
mcimadamore@1480:                       kindName(s1),
mcimadamore@1480:                       s1,
mcimadamore@1480:                       s1.location(site, types),
mcimadamore@1480:                       kindName(s2),
mcimadamore@1480:                       s2,
mcimadamore@1480:                       s2.location(site, types));
mcimadamore@1480:         }
mcimadamore@1480: 
mcimadamore@1480:         /**
mcimadamore@1480:          * If multiple applicable methods are found during overload and none of them
mcimadamore@1480:          * is more specific than the others, attempt to merge their signatures.
mcimadamore@1480:          */
mcimadamore@1480:         Symbol mergeAbstracts(Type site) {
mcimadamore@1480:             Symbol fst = ambiguousSyms.last();
mcimadamore@1480:             Symbol res = fst;
mcimadamore@1480:             for (Symbol s : ambiguousSyms.reverse()) {
mcimadamore@1480:                 Type mt1 = types.memberType(site, res);
mcimadamore@1480:                 Type mt2 = types.memberType(site, s);
mcimadamore@1480:                 if ((s.flags() & ABSTRACT) == 0 ||
mcimadamore@1480:                         !types.overrideEquivalent(mt1, mt2) ||
mcimadamore@1480:                         !types.isSameTypes(fst.erasure(types).getParameterTypes(),
mcimadamore@1480:                                        s.erasure(types).getParameterTypes())) {
mcimadamore@1480:                     //ambiguity cannot be resolved
mcimadamore@1480:                     return this;
mcimadamore@1480:                 } else {
mcimadamore@1480:                     Type mst = mostSpecificReturnType(mt1, mt2);
mcimadamore@1480:                     if (mst == null) {
mcimadamore@1480:                         // Theoretically, this can't happen, but it is possible
mcimadamore@1480:                         // due to error recovery or mixing incompatible class files
mcimadamore@1480:                         return this;
mcimadamore@1480:                     }
mcimadamore@1480:                     Symbol mostSpecific = mst == mt1 ? res : s;
mcimadamore@1480:                     List<Type> allThrown = chk.intersect(mt1.getThrownTypes(), mt2.getThrownTypes());
mcimadamore@1480:                     Type newSig = types.createMethodTypeWithThrown(mostSpecific.type, allThrown);
mcimadamore@1480:                     res = new MethodSymbol(
mcimadamore@1480:                             mostSpecific.flags(),
mcimadamore@1480:                             mostSpecific.name,
mcimadamore@1480:                             newSig,
mcimadamore@1480:                             mostSpecific.owner);
mcimadamore@1480:                 }
mcimadamore@1480:             }
mcimadamore@1480:             return res;
mcimadamore@1480:         }
mcimadamore@1480: 
mcimadamore@1480:         @Override
mcimadamore@1480:         protected Symbol access(Name name, TypeSymbol location) {
mcimadamore@1498:             Symbol firstAmbiguity = ambiguousSyms.last();
mcimadamore@1498:             return firstAmbiguity.kind == TYP ?
mcimadamore@1498:                     types.createErrorType(name, location, firstAmbiguity.type).tsym :
mcimadamore@1498:                     firstAmbiguity;
duke@1:         }
duke@1:     }
mcimadamore@160: 
mcimadamore@160:     enum MethodResolutionPhase {
mcimadamore@160:         BASIC(false, false),
mcimadamore@160:         BOX(true, false),
mcimadamore@1394:         VARARITY(true, true) {
mcimadamore@1394:             @Override
mcimadamore@1394:             public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
mcimadamore@1394:                 switch (sym.kind) {
mcimadamore@1394:                     case WRONG_MTH:
mcimadamore@1394:                         return (bestSoFar.kind == WRONG_MTH || bestSoFar.kind == WRONG_MTHS) ?
mcimadamore@1394:                             bestSoFar :
mcimadamore@1394:                             sym;
mcimadamore@1394:                     case ABSENT_MTH:
mcimadamore@1394:                         return bestSoFar;
mcimadamore@1394:                     default:
mcimadamore@1394:                         return sym;
mcimadamore@1394:                 }
mcimadamore@1394:             }
mcimadamore@1394:         };
mcimadamore@160: 
vromero@1442:         final boolean isBoxingRequired;
vromero@1442:         final 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@1394: 
mcimadamore@1394:         public Symbol mergeResults(Symbol prev, Symbol sym) {
mcimadamore@1394:             return sym;
mcimadamore@1394:         }
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@1347:         MethodResolutionPhase step = null;
mcimadamore@1215: 
mcimadamore@1215:         private boolean internalResolution = false;
mcimadamore@1347:         private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
mcimadamore@1215: 
mcimadamore@1215:         void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
mcimadamore@1215:             Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
mcimadamore@1352:             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@1479:         DeferredAttrContext deferredAttrContext(Symbol sym, InferenceContext inferenceContext) {
mcimadamore@1479:             return deferredAttr.new DeferredAttrContext(attrMode, sym, step, inferenceContext);
mcimadamore@1479:         }
mcimadamore@1479: 
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@1352:                             (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
mcimadamore@1352:                             (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
mcimadamore@1352:                             ((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@1347: 
mcimadamore@1347:         DeferredAttr.AttrMode attrMode() {
mcimadamore@1347:             return attrMode;
mcimadamore@1347:         }
mcimadamore@1347: 
mcimadamore@1347:         boolean internal() {
mcimadamore@1347:             return internalResolution;
mcimadamore@1347:         }
mcimadamore@160:     }
mcimadamore@1215: 
mcimadamore@1215:     MethodResolutionContext currentResolutionContext = null;
duke@1: }