aoqi@0: /*
rpatil@3092:  * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.javac.comp;
aoqi@0: 
aoqi@0: import com.sun.source.tree.MemberReferenceTree.ReferenceMode;
aoqi@0: import com.sun.tools.javac.api.Formattable.LocalizedString;
aoqi@0: import com.sun.tools.javac.code.*;
aoqi@0: import com.sun.tools.javac.code.Symbol.*;
aoqi@0: import com.sun.tools.javac.code.Type.*;
aoqi@0: import com.sun.tools.javac.comp.Attr.ResultInfo;
aoqi@0: import com.sun.tools.javac.comp.Check.CheckContext;
aoqi@0: import com.sun.tools.javac.comp.DeferredAttr.AttrMode;
aoqi@0: import com.sun.tools.javac.comp.DeferredAttr.DeferredAttrContext;
aoqi@0: import com.sun.tools.javac.comp.DeferredAttr.DeferredType;
aoqi@0: import com.sun.tools.javac.comp.Infer.InferenceContext;
aoqi@0: import com.sun.tools.javac.comp.Infer.FreeTypeListener;
aoqi@0: import com.sun.tools.javac.comp.Resolve.MethodResolutionContext.Candidate;
aoqi@0: import com.sun.tools.javac.comp.Resolve.MethodResolutionDiagHelper.DiagnosticRewriter;
aoqi@0: import com.sun.tools.javac.comp.Resolve.MethodResolutionDiagHelper.Template;
aoqi@0: import com.sun.tools.javac.jvm.*;
aoqi@0: import com.sun.tools.javac.main.Option;
aoqi@0: import com.sun.tools.javac.tree.*;
aoqi@0: import com.sun.tools.javac.tree.JCTree.*;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCMemberReference.ReferenceKind;
aoqi@0: import com.sun.tools.javac.tree.JCTree.JCPolyExpression.*;
aoqi@0: import com.sun.tools.javac.util.*;
aoqi@0: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticFlag;
aoqi@0: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticPosition;
aoqi@0: import com.sun.tools.javac.util.JCDiagnostic.DiagnosticType;
aoqi@0: 
aoqi@0: import java.util.Arrays;
aoqi@0: import java.util.Collection;
aoqi@0: import java.util.EnumMap;
aoqi@0: import java.util.EnumSet;
aoqi@0: import java.util.Iterator;
aoqi@0: import java.util.LinkedHashMap;
aoqi@0: import java.util.LinkedHashSet;
aoqi@0: import java.util.Map;
aoqi@0: 
aoqi@0: import javax.lang.model.element.ElementVisitor;
aoqi@0: 
aoqi@0: import static com.sun.tools.javac.code.Flags.*;
aoqi@0: import static com.sun.tools.javac.code.Flags.BLOCK;
aoqi@0: import static com.sun.tools.javac.code.Kinds.*;
aoqi@0: import static com.sun.tools.javac.code.Kinds.ERRONEOUS;
aoqi@0: import static com.sun.tools.javac.code.TypeTag.*;
aoqi@0: import static com.sun.tools.javac.comp.Resolve.MethodResolutionPhase.*;
aoqi@0: import static com.sun.tools.javac.tree.JCTree.Tag.*;
aoqi@0: 
aoqi@0: /** Helper class for name resolution, used mostly by the attribution phase.
aoqi@0:  *
aoqi@0:  *  <p><b>This is NOT part of any supported API.
aoqi@0:  *  If you write code that depends on this, you do so at your own risk.
aoqi@0:  *  This code and its internal interfaces are subject to change or
aoqi@0:  *  deletion without notice.</b>
aoqi@0:  */
aoqi@0: public class Resolve {
aoqi@0:     protected static final Context.Key<Resolve> resolveKey =
aoqi@0:         new Context.Key<Resolve>();
aoqi@0: 
aoqi@0:     Names names;
aoqi@0:     Log log;
aoqi@0:     Symtab syms;
aoqi@0:     Attr attr;
aoqi@0:     DeferredAttr deferredAttr;
aoqi@0:     Check chk;
aoqi@0:     Infer infer;
aoqi@0:     ClassReader reader;
aoqi@0:     TreeInfo treeinfo;
aoqi@0:     Types types;
aoqi@0:     JCDiagnostic.Factory diags;
aoqi@0:     public final boolean boxingEnabled;
aoqi@0:     public final boolean varargsEnabled;
aoqi@0:     public final boolean allowMethodHandles;
aoqi@0:     public final boolean allowFunctionalInterfaceMostSpecific;
vromero@2535:     public final boolean checkVarargsAccessAfterResolution;
aoqi@0:     private final boolean debugResolve;
aoqi@0:     private final boolean compactMethodDiags;
aoqi@0:     final EnumSet<VerboseResolutionMode> verboseResolutionMode;
aoqi@0: 
aoqi@0:     Scope polymorphicSignatureScope;
aoqi@0: 
aoqi@0:     protected Resolve(Context context) {
aoqi@0:         context.put(resolveKey, this);
aoqi@0:         syms = Symtab.instance(context);
aoqi@0: 
aoqi@0:         varNotFound = new
aoqi@0:             SymbolNotFoundError(ABSENT_VAR);
aoqi@0:         methodNotFound = new
aoqi@0:             SymbolNotFoundError(ABSENT_MTH);
aoqi@0:         methodWithCorrectStaticnessNotFound = new
aoqi@0:             SymbolNotFoundError(WRONG_STATICNESS,
aoqi@0:                 "method found has incorrect staticness");
aoqi@0:         typeNotFound = new
aoqi@0:             SymbolNotFoundError(ABSENT_TYP);
aoqi@0: 
aoqi@0:         names = Names.instance(context);
aoqi@0:         log = Log.instance(context);
aoqi@0:         attr = Attr.instance(context);
aoqi@0:         deferredAttr = DeferredAttr.instance(context);
aoqi@0:         chk = Check.instance(context);
aoqi@0:         infer = Infer.instance(context);
aoqi@0:         reader = ClassReader.instance(context);
aoqi@0:         treeinfo = TreeInfo.instance(context);
aoqi@0:         types = Types.instance(context);
aoqi@0:         diags = JCDiagnostic.Factory.instance(context);
aoqi@0:         Source source = Source.instance(context);
aoqi@0:         boxingEnabled = source.allowBoxing();
aoqi@0:         varargsEnabled = source.allowVarargs();
aoqi@0:         Options options = Options.instance(context);
aoqi@0:         debugResolve = options.isSet("debugresolve");
aoqi@0:         compactMethodDiags = options.isSet(Option.XDIAGS, "compact") ||
aoqi@0:                 options.isUnset(Option.XDIAGS) && options.isUnset("rawDiagnostics");
aoqi@0:         verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
aoqi@0:         Target target = Target.instance(context);
aoqi@0:         allowMethodHandles = target.hasMethodHandles();
aoqi@0:         allowFunctionalInterfaceMostSpecific = source.allowFunctionalInterfaceMostSpecific();
vromero@2535:         checkVarargsAccessAfterResolution =
vromero@2531:                 source.allowPostApplicabilityVarargsAccessCheck();
aoqi@0:         polymorphicSignatureScope = new Scope(syms.noSymbol);
aoqi@0: 
aoqi@0:         inapplicableMethodException = new InapplicableMethodException(diags);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** error symbols, which are returned when resolution fails
aoqi@0:      */
aoqi@0:     private final SymbolNotFoundError varNotFound;
aoqi@0:     private final SymbolNotFoundError methodNotFound;
aoqi@0:     private final SymbolNotFoundError methodWithCorrectStaticnessNotFound;
aoqi@0:     private final SymbolNotFoundError typeNotFound;
aoqi@0: 
aoqi@0:     public static Resolve instance(Context context) {
aoqi@0:         Resolve instance = context.get(resolveKey);
aoqi@0:         if (instance == null)
aoqi@0:             instance = new Resolve(context);
aoqi@0:         return instance;
aoqi@0:     }
aoqi@0: 
aoqi@0:     // <editor-fold defaultstate="collapsed" desc="Verbose resolution diagnostics support">
aoqi@0:     enum VerboseResolutionMode {
aoqi@0:         SUCCESS("success"),
aoqi@0:         FAILURE("failure"),
aoqi@0:         APPLICABLE("applicable"),
aoqi@0:         INAPPLICABLE("inapplicable"),
aoqi@0:         DEFERRED_INST("deferred-inference"),
aoqi@0:         PREDEF("predef"),
aoqi@0:         OBJECT_INIT("object-init"),
aoqi@0:         INTERNAL("internal");
aoqi@0: 
aoqi@0:         final String opt;
aoqi@0: 
aoqi@0:         private VerboseResolutionMode(String opt) {
aoqi@0:             this.opt = opt;
aoqi@0:         }
aoqi@0: 
aoqi@0:         static EnumSet<VerboseResolutionMode> getVerboseResolutionMode(Options opts) {
aoqi@0:             String s = opts.get("verboseResolution");
aoqi@0:             EnumSet<VerboseResolutionMode> res = EnumSet.noneOf(VerboseResolutionMode.class);
aoqi@0:             if (s == null) return res;
aoqi@0:             if (s.contains("all")) {
aoqi@0:                 res = EnumSet.allOf(VerboseResolutionMode.class);
aoqi@0:             }
aoqi@0:             Collection<String> args = Arrays.asList(s.split(","));
aoqi@0:             for (VerboseResolutionMode mode : values()) {
aoqi@0:                 if (args.contains(mode.opt)) {
aoqi@0:                     res.add(mode);
aoqi@0:                 } else if (args.contains("-" + mode.opt)) {
aoqi@0:                     res.remove(mode);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             return res;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     void reportVerboseResolutionDiagnostic(DiagnosticPosition dpos, Name name, Type site,
aoqi@0:             List<Type> argtypes, List<Type> typeargtypes, Symbol bestSoFar) {
aoqi@0:         boolean success = bestSoFar.kind < ERRONEOUS;
aoqi@0: 
aoqi@0:         if (success && !verboseResolutionMode.contains(VerboseResolutionMode.SUCCESS)) {
aoqi@0:             return;
aoqi@0:         } else if (!success && !verboseResolutionMode.contains(VerboseResolutionMode.FAILURE)) {
aoqi@0:             return;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (bestSoFar.name == names.init &&
aoqi@0:                 bestSoFar.owner == syms.objectType.tsym &&
aoqi@0:                 !verboseResolutionMode.contains(VerboseResolutionMode.OBJECT_INIT)) {
aoqi@0:             return; //skip diags for Object constructor resolution
aoqi@0:         } else if (site == syms.predefClass.type &&
aoqi@0:                 !verboseResolutionMode.contains(VerboseResolutionMode.PREDEF)) {
aoqi@0:             return; //skip spurious diags for predef symbols (i.e. operators)
aoqi@0:         } else if (currentResolutionContext.internalResolution &&
aoqi@0:                 !verboseResolutionMode.contains(VerboseResolutionMode.INTERNAL)) {
aoqi@0:             return;
aoqi@0:         }
aoqi@0: 
aoqi@0:         int pos = 0;
aoqi@0:         int mostSpecificPos = -1;
aoqi@0:         ListBuffer<JCDiagnostic> subDiags = new ListBuffer<>();
aoqi@0:         for (Candidate c : currentResolutionContext.candidates) {
aoqi@0:             if (currentResolutionContext.step != c.step ||
aoqi@0:                     (c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.APPLICABLE)) ||
aoqi@0:                     (!c.isApplicable() && !verboseResolutionMode.contains(VerboseResolutionMode.INAPPLICABLE))) {
aoqi@0:                 continue;
aoqi@0:             } else {
aoqi@0:                 subDiags.append(c.isApplicable() ?
aoqi@0:                         getVerboseApplicableCandidateDiag(pos, c.sym, c.mtype) :
aoqi@0:                         getVerboseInapplicableCandidateDiag(pos, c.sym, c.details));
aoqi@0:                 if (c.sym == bestSoFar)
aoqi@0:                     mostSpecificPos = pos;
aoqi@0:                 pos++;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         String key = success ? "verbose.resolve.multi" : "verbose.resolve.multi.1";
aoqi@0:         List<Type> argtypes2 = Type.map(argtypes,
aoqi@0:                     deferredAttr.new RecoveryDeferredTypeMap(AttrMode.SPECULATIVE, bestSoFar, currentResolutionContext.step));
aoqi@0:         JCDiagnostic main = diags.note(log.currentSource(), dpos, key, name,
aoqi@0:                 site.tsym, mostSpecificPos, currentResolutionContext.step,
aoqi@0:                 methodArguments(argtypes2),
aoqi@0:                 methodArguments(typeargtypes));
aoqi@0:         JCDiagnostic d = new JCDiagnostic.MultilineDiagnostic(main, subDiags.toList());
aoqi@0:         log.report(d);
aoqi@0:     }
aoqi@0: 
aoqi@0:     JCDiagnostic getVerboseApplicableCandidateDiag(int pos, Symbol sym, Type inst) {
aoqi@0:         JCDiagnostic subDiag = null;
aoqi@0:         if (sym.type.hasTag(FORALL)) {
aoqi@0:             subDiag = diags.fragment("partial.inst.sig", inst);
aoqi@0:         }
aoqi@0: 
aoqi@0:         String key = subDiag == null ?
aoqi@0:                 "applicable.method.found" :
aoqi@0:                 "applicable.method.found.1";
aoqi@0: 
aoqi@0:         return diags.fragment(key, pos, sym, subDiag);
aoqi@0:     }
aoqi@0: 
aoqi@0:     JCDiagnostic getVerboseInapplicableCandidateDiag(int pos, Symbol sym, JCDiagnostic subDiag) {
aoqi@0:         return diags.fragment("not.applicable.method.found", pos, sym, subDiag);
aoqi@0:     }
aoqi@0:     // </editor-fold>
aoqi@0: 
aoqi@0: /* ************************************************************************
aoqi@0:  * Identifier resolution
aoqi@0:  *************************************************************************/
aoqi@0: 
aoqi@0:     /** An environment is "static" if its static level is greater than
aoqi@0:      *  the one of its outer environment
aoqi@0:      */
aoqi@0:     protected static boolean isStatic(Env<AttrContext> env) {
alundblad@2814:         return env.outer != null && env.info.staticLevel > env.outer.info.staticLevel;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** An environment is an "initializer" if it is a constructor or
aoqi@0:      *  an instance initializer.
aoqi@0:      */
aoqi@0:     static boolean isInitializer(Env<AttrContext> env) {
aoqi@0:         Symbol owner = env.info.scope.owner;
aoqi@0:         return owner.isConstructor() ||
aoqi@0:             owner.owner.kind == TYP &&
aoqi@0:             (owner.kind == VAR ||
aoqi@0:              owner.kind == MTH && (owner.flags() & BLOCK) != 0) &&
aoqi@0:             (owner.flags() & STATIC) == 0;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Is class accessible in given evironment?
aoqi@0:      *  @param env    The current environment.
aoqi@0:      *  @param c      The class whose accessibility is checked.
aoqi@0:      */
aoqi@0:     public boolean isAccessible(Env<AttrContext> env, TypeSymbol c) {
aoqi@0:         return isAccessible(env, c, false);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isAccessible(Env<AttrContext> env, TypeSymbol c, boolean checkInner) {
aoqi@0:         boolean isAccessible = false;
aoqi@0:         switch ((short)(c.flags() & AccessFlags)) {
aoqi@0:             case PRIVATE:
aoqi@0:                 isAccessible =
aoqi@0:                     env.enclClass.sym.outermostClass() ==
aoqi@0:                     c.owner.outermostClass();
aoqi@0:                 break;
aoqi@0:             case 0:
aoqi@0:                 isAccessible =
aoqi@0:                     env.toplevel.packge == c.owner // fast special case
aoqi@0:                     ||
aoqi@0:                     env.toplevel.packge == c.packge()
aoqi@0:                     ||
aoqi@0:                     // Hack: this case is added since synthesized default constructors
aoqi@0:                     // of anonymous classes should be allowed to access
aoqi@0:                     // classes which would be inaccessible otherwise.
aoqi@0:                     env.enclMethod != null &&
aoqi@0:                     (env.enclMethod.mods.flags & ANONCONSTR) != 0;
aoqi@0:                 break;
aoqi@0:             default: // error recovery
aoqi@0:             case PUBLIC:
aoqi@0:                 isAccessible = true;
aoqi@0:                 break;
aoqi@0:             case PROTECTED:
aoqi@0:                 isAccessible =
aoqi@0:                     env.toplevel.packge == c.owner // fast special case
aoqi@0:                     ||
aoqi@0:                     env.toplevel.packge == c.packge()
aoqi@0:                     ||
aoqi@0:                     isInnerSubClass(env.enclClass.sym, c.owner);
aoqi@0:                 break;
aoqi@0:         }
aoqi@0:         return (checkInner == false || c.type.getEnclosingType() == Type.noType) ?
aoqi@0:             isAccessible :
aoqi@0:             isAccessible && isAccessible(env, c.type.getEnclosingType(), checkInner);
aoqi@0:     }
aoqi@0:     //where
aoqi@0:         /** Is given class a subclass of given base class, or an inner class
aoqi@0:          *  of a subclass?
aoqi@0:          *  Return null if no such class exists.
aoqi@0:          *  @param c     The class which is the subclass or is contained in it.
aoqi@0:          *  @param base  The base class
aoqi@0:          */
aoqi@0:         private boolean isInnerSubClass(ClassSymbol c, Symbol base) {
aoqi@0:             while (c != null && !c.isSubClass(base, types)) {
aoqi@0:                 c = c.owner.enclClass();
aoqi@0:             }
aoqi@0:             return c != null;
aoqi@0:         }
aoqi@0: 
aoqi@0:     boolean isAccessible(Env<AttrContext> env, Type t) {
aoqi@0:         return isAccessible(env, t, false);
aoqi@0:     }
aoqi@0: 
aoqi@0:     boolean isAccessible(Env<AttrContext> env, Type t, boolean checkInner) {
aoqi@0:         return (t.hasTag(ARRAY))
aoqi@0:             ? isAccessible(env, types.cvarUpperBound(types.elemtype(t)))
aoqi@0:             : isAccessible(env, t.tsym, checkInner);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Is symbol accessible as a member of given type in given environment?
aoqi@0:      *  @param env    The current environment.
aoqi@0:      *  @param site   The type of which the tested symbol is regarded
aoqi@0:      *                as a member.
aoqi@0:      *  @param sym    The symbol.
aoqi@0:      */
aoqi@0:     public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym) {
aoqi@0:         return isAccessible(env, site, sym, false);
aoqi@0:     }
aoqi@0:     public boolean isAccessible(Env<AttrContext> env, Type site, Symbol sym, boolean checkInner) {
aoqi@0:         if (sym.name == names.init && sym.owner != site.tsym) return false;
aoqi@0:         switch ((short)(sym.flags() & AccessFlags)) {
aoqi@0:         case PRIVATE:
aoqi@0:             return
aoqi@0:                 (env.enclClass.sym == sym.owner // fast special case
aoqi@0:                  ||
aoqi@0:                  env.enclClass.sym.outermostClass() ==
aoqi@0:                  sym.owner.outermostClass())
aoqi@0:                 &&
aoqi@0:                 sym.isInheritedIn(site.tsym, types);
aoqi@0:         case 0:
aoqi@0:             return
aoqi@0:                 (env.toplevel.packge == sym.owner.owner // fast special case
aoqi@0:                  ||
aoqi@0:                  env.toplevel.packge == sym.packge())
aoqi@0:                 &&
aoqi@0:                 isAccessible(env, site, checkInner)
aoqi@0:                 &&
aoqi@0:                 sym.isInheritedIn(site.tsym, types)
aoqi@0:                 &&
aoqi@0:                 notOverriddenIn(site, sym);
aoqi@0:         case PROTECTED:
aoqi@0:             return
aoqi@0:                 (env.toplevel.packge == sym.owner.owner // fast special case
aoqi@0:                  ||
aoqi@0:                  env.toplevel.packge == sym.packge()
aoqi@0:                  ||
aoqi@0:                  isProtectedAccessible(sym, env.enclClass.sym, site)
aoqi@0:                  ||
aoqi@0:                  // OK to select instance method or field from 'super' or type name
aoqi@0:                  // (but type names should be disallowed elsewhere!)
aoqi@0:                  env.info.selectSuper && (sym.flags() & STATIC) == 0 && sym.kind != TYP)
aoqi@0:                 &&
aoqi@0:                 isAccessible(env, site, checkInner)
aoqi@0:                 &&
aoqi@0:                 notOverriddenIn(site, sym);
aoqi@0:         default: // this case includes erroneous combinations as well
aoqi@0:             return isAccessible(env, site, checkInner) && notOverriddenIn(site, sym);
aoqi@0:         }
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     /* `sym' is accessible only if not overridden by
aoqi@0:      * another symbol which is a member of `site'
aoqi@0:      * (because, if it is overridden, `sym' is not strictly
aoqi@0:      * speaking a member of `site'). A polymorphic signature method
aoqi@0:      * cannot be overridden (e.g. MH.invokeExact(Object[])).
aoqi@0:      */
aoqi@0:     private boolean notOverriddenIn(Type site, Symbol sym) {
aoqi@0:         if (sym.kind != MTH || sym.isConstructor() || sym.isStatic())
aoqi@0:             return true;
aoqi@0:         else {
aoqi@0:             Symbol s2 = ((MethodSymbol)sym).implementation(site.tsym, types, true);
aoqi@0:             return (s2 == null || s2 == sym || sym.owner == s2.owner ||
aoqi@0:                     !types.isSubSignature(types.memberType(site, s2), types.memberType(site, sym)));
aoqi@0:         }
aoqi@0:     }
aoqi@0:     //where
aoqi@0:         /** Is given protected symbol accessible if it is selected from given site
aoqi@0:          *  and the selection takes place in given class?
aoqi@0:          *  @param sym     The symbol with protected access
aoqi@0:          *  @param c       The class where the access takes place
aoqi@0:          *  @site          The type of the qualifier
aoqi@0:          */
aoqi@0:         private
aoqi@0:         boolean isProtectedAccessible(Symbol sym, ClassSymbol c, Type site) {
aoqi@0:             Type newSite = site.hasTag(TYPEVAR) ? site.getUpperBound() : site;
aoqi@0:             while (c != null &&
aoqi@0:                    !(c.isSubClass(sym.owner, types) &&
aoqi@0:                      (c.flags() & INTERFACE) == 0 &&
aoqi@0:                      // In JLS 2e 6.6.2.1, the subclass restriction applies
aoqi@0:                      // only to instance fields and methods -- types are excluded
aoqi@0:                      // regardless of whether they are declared 'static' or not.
aoqi@0:                      ((sym.flags() & STATIC) != 0 || sym.kind == TYP || newSite.tsym.isSubClass(c, types))))
aoqi@0:                 c = c.owner.enclClass();
aoqi@0:             return c != null;
aoqi@0:         }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Performs a recursive scan of a type looking for accessibility problems
aoqi@0:      * from current attribution environment
aoqi@0:      */
aoqi@0:     void checkAccessibleType(Env<AttrContext> env, Type t) {
aoqi@0:         accessibilityChecker.visit(t, env);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Accessibility type-visitor
aoqi@0:      */
aoqi@0:     Types.SimpleVisitor<Void, Env<AttrContext>> accessibilityChecker =
aoqi@0:             new Types.SimpleVisitor<Void, Env<AttrContext>>() {
aoqi@0: 
aoqi@0:         void visit(List<Type> ts, Env<AttrContext> env) {
aoqi@0:             for (Type t : ts) {
aoqi@0:                 visit(t, env);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         public Void visitType(Type t, Env<AttrContext> env) {
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitArrayType(ArrayType t, Env<AttrContext> env) {
aoqi@0:             visit(t.elemtype, env);
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitClassType(ClassType t, Env<AttrContext> env) {
aoqi@0:             visit(t.getTypeArguments(), env);
aoqi@0:             if (!isAccessible(env, t, true)) {
aoqi@0:                 accessBase(new AccessError(t.tsym), env.tree.pos(), env.enclClass.sym, t, t.tsym.name, true);
aoqi@0:             }
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitWildcardType(WildcardType t, Env<AttrContext> env) {
aoqi@0:             visit(t.type, env);
aoqi@0:             return null;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Void visitMethodType(MethodType t, Env<AttrContext> env) {
aoqi@0:             visit(t.getParameterTypes(), env);
aoqi@0:             visit(t.getReturnType(), env);
aoqi@0:             visit(t.getThrownTypes(), env);
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     /** Try to instantiate the type of a method so that it fits
aoqi@0:      *  given type arguments and argument types. If successful, return
aoqi@0:      *  the method's instantiated type, else return null.
aoqi@0:      *  The instantiation will take into account an additional leading
aoqi@0:      *  formal parameter if the method is an instance method seen as a member
aoqi@0:      *  of an under determined site. In this case, we treat site as an additional
aoqi@0:      *  parameter and the parameters of the class containing the method as
aoqi@0:      *  additional type variables that get instantiated.
aoqi@0:      *
aoqi@0:      *  @param env         The current environment
aoqi@0:      *  @param site        The type of which the method is a member.
aoqi@0:      *  @param m           The method symbol.
aoqi@0:      *  @param argtypes    The invocation's given value arguments.
aoqi@0:      *  @param typeargtypes    The invocation's given type arguments.
aoqi@0:      *  @param allowBoxing Allow boxing conversions of arguments.
aoqi@0:      *  @param useVarargs Box trailing arguments into an array for varargs.
aoqi@0:      */
aoqi@0:     Type rawInstantiate(Env<AttrContext> env,
aoqi@0:                         Type site,
aoqi@0:                         Symbol m,
aoqi@0:                         ResultInfo resultInfo,
aoqi@0:                         List<Type> argtypes,
aoqi@0:                         List<Type> typeargtypes,
aoqi@0:                         boolean allowBoxing,
aoqi@0:                         boolean useVarargs,
aoqi@0:                         Warner warn) throws Infer.InferenceException {
aoqi@0: 
aoqi@0:         Type mt = types.memberType(site, m);
aoqi@0:         // tvars is the list of formal type variables for which type arguments
aoqi@0:         // need to inferred.
aoqi@0:         List<Type> tvars = List.nil();
aoqi@0:         if (typeargtypes == null) typeargtypes = List.nil();
aoqi@0:         if (!mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
aoqi@0:             // This is not a polymorphic method, but typeargs are supplied
aoqi@0:             // which is fine, see JLS 15.12.2.1
aoqi@0:         } else if (mt.hasTag(FORALL) && typeargtypes.nonEmpty()) {
aoqi@0:             ForAll pmt = (ForAll) mt;
aoqi@0:             if (typeargtypes.length() != pmt.tvars.length())
aoqi@0:                 throw inapplicableMethodException.setMessage("arg.length.mismatch"); // not enough args
aoqi@0:             // Check type arguments are within bounds
aoqi@0:             List<Type> formals = pmt.tvars;
aoqi@0:             List<Type> actuals = typeargtypes;
aoqi@0:             while (formals.nonEmpty() && actuals.nonEmpty()) {
aoqi@0:                 List<Type> bounds = types.subst(types.getBounds((TypeVar)formals.head),
aoqi@0:                                                 pmt.tvars, typeargtypes);
aoqi@0:                 for (; bounds.nonEmpty(); bounds = bounds.tail)
aoqi@0:                     if (!types.isSubtypeUnchecked(actuals.head, bounds.head, warn))
aoqi@0:                         throw inapplicableMethodException.setMessage("explicit.param.do.not.conform.to.bounds",actuals.head, bounds);
aoqi@0:                 formals = formals.tail;
aoqi@0:                 actuals = actuals.tail;
aoqi@0:             }
aoqi@0:             mt = types.subst(pmt.qtype, pmt.tvars, typeargtypes);
aoqi@0:         } else if (mt.hasTag(FORALL)) {
aoqi@0:             ForAll pmt = (ForAll) mt;
aoqi@0:             List<Type> tvars1 = types.newInstances(pmt.tvars);
aoqi@0:             tvars = tvars.appendList(tvars1);
aoqi@0:             mt = types.subst(pmt.qtype, pmt.tvars, tvars1);
aoqi@0:         }
aoqi@0: 
aoqi@0:         // find out whether we need to go the slow route via infer
aoqi@0:         boolean instNeeded = tvars.tail != null; /*inlined: tvars.nonEmpty()*/
aoqi@0:         for (List<Type> l = argtypes;
aoqi@0:              l.tail != null/*inlined: l.nonEmpty()*/ && !instNeeded;
aoqi@0:              l = l.tail) {
aoqi@0:             if (l.head.hasTag(FORALL)) instNeeded = true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (instNeeded)
aoqi@0:             return infer.instantiateMethod(env,
aoqi@0:                                     tvars,
aoqi@0:                                     (MethodType)mt,
aoqi@0:                                     resultInfo,
aoqi@0:                                     (MethodSymbol)m,
aoqi@0:                                     argtypes,
aoqi@0:                                     allowBoxing,
aoqi@0:                                     useVarargs,
aoqi@0:                                     currentResolutionContext,
aoqi@0:                                     warn);
aoqi@0: 
aoqi@0:         DeferredAttr.DeferredAttrContext dc = currentResolutionContext.deferredAttrContext(m, infer.emptyContext, resultInfo, warn);
aoqi@0:         currentResolutionContext.methodCheck.argumentsAcceptable(env, dc,
aoqi@0:                                 argtypes, mt.getParameterTypes(), warn);
aoqi@0:         dc.complete();
aoqi@0:         return mt;
aoqi@0:     }
aoqi@0: 
aoqi@0:     Type checkMethod(Env<AttrContext> env,
aoqi@0:                      Type site,
aoqi@0:                      Symbol m,
aoqi@0:                      ResultInfo resultInfo,
aoqi@0:                      List<Type> argtypes,
aoqi@0:                      List<Type> typeargtypes,
aoqi@0:                      Warner warn) {
aoqi@0:         MethodResolutionContext prevContext = currentResolutionContext;
aoqi@0:         try {
aoqi@0:             currentResolutionContext = new MethodResolutionContext();
aoqi@0:             currentResolutionContext.attrMode = DeferredAttr.AttrMode.CHECK;
aoqi@0:             if (env.tree.hasTag(JCTree.Tag.REFERENCE)) {
aoqi@0:                 //method/constructor references need special check class
aoqi@0:                 //to handle inference variables in 'argtypes' (might happen
aoqi@0:                 //during an unsticking round)
aoqi@0:                 currentResolutionContext.methodCheck =
aoqi@0:                         new MethodReferenceCheck(resultInfo.checkContext.inferenceContext());
aoqi@0:             }
aoqi@0:             MethodResolutionPhase step = currentResolutionContext.step = env.info.pendingResolutionPhase;
aoqi@0:             return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
aoqi@0:                     step.isBoxingRequired(), step.isVarargsRequired(), warn);
aoqi@0:         }
aoqi@0:         finally {
aoqi@0:             currentResolutionContext = prevContext;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Same but returns null instead throwing a NoInstanceException
aoqi@0:      */
aoqi@0:     Type instantiate(Env<AttrContext> env,
aoqi@0:                      Type site,
aoqi@0:                      Symbol m,
aoqi@0:                      ResultInfo resultInfo,
aoqi@0:                      List<Type> argtypes,
aoqi@0:                      List<Type> typeargtypes,
aoqi@0:                      boolean allowBoxing,
aoqi@0:                      boolean useVarargs,
aoqi@0:                      Warner warn) {
aoqi@0:         try {
aoqi@0:             return rawInstantiate(env, site, m, resultInfo, argtypes, typeargtypes,
aoqi@0:                                   allowBoxing, useVarargs, warn);
aoqi@0:         } catch (InapplicableMethodException ex) {
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * This interface defines an entry point that should be used to perform a
aoqi@0:      * method check. A method check usually consist in determining as to whether
aoqi@0:      * a set of types (actuals) is compatible with another set of types (formals).
aoqi@0:      * Since the notion of compatibility can vary depending on the circumstances,
aoqi@0:      * this interfaces allows to easily add new pluggable method check routines.
aoqi@0:      */
aoqi@0:     interface MethodCheck {
aoqi@0:         /**
aoqi@0:          * Main method check routine. A method check usually consist in determining
aoqi@0:          * as to whether a set of types (actuals) is compatible with another set of
aoqi@0:          * types (formals). If an incompatibility is found, an unchecked exception
aoqi@0:          * is assumed to be thrown.
aoqi@0:          */
aoqi@0:         void argumentsAcceptable(Env<AttrContext> env,
aoqi@0:                                 DeferredAttrContext deferredAttrContext,
aoqi@0:                                 List<Type> argtypes,
aoqi@0:                                 List<Type> formals,
aoqi@0:                                 Warner warn);
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Retrieve the method check object that will be used during a
aoqi@0:          * most specific check.
aoqi@0:          */
aoqi@0:         MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper enum defining all method check diagnostics (used by resolveMethodCheck).
aoqi@0:      */
aoqi@0:     enum MethodCheckDiag {
aoqi@0:         /**
aoqi@0:          * Actuals and formals differs in length.
aoqi@0:          */
aoqi@0:         ARITY_MISMATCH("arg.length.mismatch", "infer.arg.length.mismatch"),
aoqi@0:         /**
aoqi@0:          * An actual is incompatible with a formal.
aoqi@0:          */
aoqi@0:         ARG_MISMATCH("no.conforming.assignment.exists", "infer.no.conforming.assignment.exists"),
aoqi@0:         /**
aoqi@0:          * An actual is incompatible with the varargs element type.
aoqi@0:          */
aoqi@0:         VARARG_MISMATCH("varargs.argument.mismatch", "infer.varargs.argument.mismatch"),
aoqi@0:         /**
aoqi@0:          * The varargs element type is inaccessible.
aoqi@0:          */
aoqi@0:         INACCESSIBLE_VARARGS("inaccessible.varargs.type", "inaccessible.varargs.type");
aoqi@0: 
aoqi@0:         final String basicKey;
aoqi@0:         final String inferKey;
aoqi@0: 
aoqi@0:         MethodCheckDiag(String basicKey, String inferKey) {
aoqi@0:             this.basicKey = basicKey;
aoqi@0:             this.inferKey = inferKey;
aoqi@0:         }
aoqi@0: 
aoqi@0:         String regex() {
aoqi@0:             return String.format("([a-z]*\\.)*(%s|%s)", basicKey, inferKey);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Dummy method check object. All methods are deemed applicable, regardless
aoqi@0:      * of their formal parameter types.
aoqi@0:      */
aoqi@0:     MethodCheck nilMethodCheck = new MethodCheck() {
aoqi@0:         public void argumentsAcceptable(Env<AttrContext> env, DeferredAttrContext deferredAttrContext, List<Type> argtypes, List<Type> formals, Warner warn) {
aoqi@0:             //do nothing - method always applicable regardless of actuals
aoqi@0:         }
aoqi@0: 
aoqi@0:         public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
aoqi@0:             return this;
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Base class for 'real' method checks. The class defines the logic for
aoqi@0:      * iterating through formals and actuals and provides and entry point
aoqi@0:      * that can be used by subclasses in order to define the actual check logic.
aoqi@0:      */
aoqi@0:     abstract class AbstractMethodCheck implements MethodCheck {
aoqi@0:         @Override
aoqi@0:         public void argumentsAcceptable(final Env<AttrContext> env,
aoqi@0:                                     DeferredAttrContext deferredAttrContext,
aoqi@0:                                     List<Type> argtypes,
aoqi@0:                                     List<Type> formals,
aoqi@0:                                     Warner warn) {
aoqi@0:             //should we expand formals?
aoqi@0:             boolean useVarargs = deferredAttrContext.phase.isVarargsRequired();
sadayapalam@3005:             JCTree callTree = treeForDiagnostics(env);
sadayapalam@3005:             List<JCExpression> trees = TreeInfo.args(callTree);
aoqi@0: 
aoqi@0:             //inference context used during this method check
aoqi@0:             InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
aoqi@0: 
aoqi@0:             Type varargsFormal = useVarargs ? formals.last() : null;
aoqi@0: 
aoqi@0:             if (varargsFormal == null &&
aoqi@0:                     argtypes.size() != formals.size()) {
sadayapalam@3005:                 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
aoqi@0:             }
aoqi@0: 
aoqi@0:             while (argtypes.nonEmpty() && formals.head != varargsFormal) {
aoqi@0:                 DiagnosticPosition pos = trees != null ? trees.head : null;
aoqi@0:                 checkArg(pos, false, argtypes.head, formals.head, deferredAttrContext, warn);
aoqi@0:                 argtypes = argtypes.tail;
aoqi@0:                 formals = formals.tail;
aoqi@0:                 trees = trees != null ? trees.tail : trees;
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (formals.head != varargsFormal) {
sadayapalam@3005:                 reportMC(callTree, MethodCheckDiag.ARITY_MISMATCH, inferenceContext); // not enough args
aoqi@0:             }
aoqi@0: 
aoqi@0:             if (useVarargs) {
aoqi@0:                 //note: if applicability check is triggered by most specific test,
aoqi@0:                 //the last argument of a varargs is _not_ an array type (see JLS 15.12.2.5)
aoqi@0:                 final Type elt = types.elemtype(varargsFormal);
aoqi@0:                 while (argtypes.nonEmpty()) {
aoqi@0:                     DiagnosticPosition pos = trees != null ? trees.head : null;
aoqi@0:                     checkArg(pos, true, argtypes.head, elt, deferredAttrContext, warn);
aoqi@0:                     argtypes = argtypes.tail;
aoqi@0:                     trees = trees != null ? trees.tail : trees;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
sadayapalam@3005:             // where
sadayapalam@3005:             private JCTree treeForDiagnostics(Env<AttrContext> env) {
sadayapalam@3005:                 return env.info.preferredTreeForDiagnostics != null ? env.info.preferredTreeForDiagnostics : env.tree;
sadayapalam@3005:             }
sadayapalam@3005: 
aoqi@0:         /**
aoqi@0:          * Does the actual argument conforms to the corresponding formal?
aoqi@0:          */
aoqi@0:         abstract void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn);
aoqi@0: 
aoqi@0:         protected void reportMC(DiagnosticPosition pos, MethodCheckDiag diag, InferenceContext inferenceContext, Object... args) {
aoqi@0:             boolean inferDiag = inferenceContext != infer.emptyContext;
aoqi@0:             InapplicableMethodException ex = inferDiag ?
aoqi@0:                     infer.inferenceException : inapplicableMethodException;
aoqi@0:             if (inferDiag && (!diag.inferKey.equals(diag.basicKey))) {
aoqi@0:                 Object[] args2 = new Object[args.length + 1];
aoqi@0:                 System.arraycopy(args, 0, args2, 1, args.length);
aoqi@0:                 args2[0] = inferenceContext.inferenceVars();
aoqi@0:                 args = args2;
aoqi@0:             }
aoqi@0:             String key = inferDiag ? diag.inferKey : diag.basicKey;
aoqi@0:             throw ex.setMessage(diags.create(DiagnosticType.FRAGMENT, log.currentSource(), pos, key, args));
aoqi@0:         }
aoqi@0: 
aoqi@0:         public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
aoqi@0:             return nilMethodCheck;
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Arity-based method check. A method is applicable if the number of actuals
aoqi@0:      * supplied conforms to the method signature.
aoqi@0:      */
aoqi@0:     MethodCheck arityMethodCheck = new AbstractMethodCheck() {
aoqi@0:         @Override
aoqi@0:         void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
aoqi@0:             //do nothing - actual always compatible to formals
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             return "arityMethodCheck";
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     List<Type> dummyArgs(int length) {
aoqi@0:         ListBuffer<Type> buf = new ListBuffer<>();
aoqi@0:         for (int i = 0 ; i < length ; i++) {
aoqi@0:             buf.append(Type.noType);
aoqi@0:         }
aoqi@0:         return buf.toList();
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Main method applicability routine. Given a list of actual types A,
aoqi@0:      * a list of formal types F, determines whether the types in A are
aoqi@0:      * compatible (by method invocation conversion) with the types in F.
aoqi@0:      *
aoqi@0:      * Since this routine is shared between overload resolution and method
aoqi@0:      * type-inference, a (possibly empty) inference context is used to convert
aoqi@0:      * formal types to the corresponding 'undet' form ahead of a compatibility
aoqi@0:      * check so that constraints can be propagated and collected.
aoqi@0:      *
aoqi@0:      * Moreover, if one or more types in A is a deferred type, this routine uses
aoqi@0:      * DeferredAttr in order to perform deferred attribution. If one or more actual
aoqi@0:      * deferred types are stuck, they are placed in a queue and revisited later
aoqi@0:      * after the remainder of the arguments have been seen. If this is not sufficient
aoqi@0:      * to 'unstuck' the argument, a cyclic inference error is called out.
aoqi@0:      *
aoqi@0:      * A method check handler (see above) is used in order to report errors.
aoqi@0:      */
aoqi@0:     MethodCheck resolveMethodCheck = new AbstractMethodCheck() {
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
aoqi@0:             ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
aoqi@0:             mresult.check(pos, actual);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void argumentsAcceptable(final Env<AttrContext> env,
aoqi@0:                                     DeferredAttrContext deferredAttrContext,
aoqi@0:                                     List<Type> argtypes,
aoqi@0:                                     List<Type> formals,
aoqi@0:                                     Warner warn) {
aoqi@0:             super.argumentsAcceptable(env, deferredAttrContext, argtypes, formals, warn);
dlsmith@2788:             // should we check varargs element type accessibility?
aoqi@0:             if (deferredAttrContext.phase.isVarargsRequired()) {
dlsmith@2788:                 if (deferredAttrContext.mode == AttrMode.CHECK || !checkVarargsAccessAfterResolution) {
dlsmith@2788:                     varargsAccessible(env, types.elemtype(formals.last()), deferredAttrContext.inferenceContext);
vromero@2535:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
dlsmith@2788:         /**
dlsmith@2788:          * Test that the runtime array element type corresponding to 't' is accessible.  't' should be the
dlsmith@2788:          * varargs element type of either the method invocation type signature (after inference completes)
dlsmith@2788:          * or the method declaration signature (before inference completes).
dlsmith@2788:          */
aoqi@0:         private void varargsAccessible(final Env<AttrContext> env, final Type t, final InferenceContext inferenceContext) {
aoqi@0:             if (inferenceContext.free(t)) {
aoqi@0:                 inferenceContext.addFreeTypeListener(List.of(t), new FreeTypeListener() {
aoqi@0:                     @Override
aoqi@0:                     public void typesInferred(InferenceContext inferenceContext) {
aoqi@0:                         varargsAccessible(env, inferenceContext.asInstType(t), inferenceContext);
aoqi@0:                     }
aoqi@0:                 });
aoqi@0:             } else {
dlsmith@2788:                 if (!isAccessible(env, types.erasure(t))) {
aoqi@0:                     Symbol location = env.enclClass.sym;
aoqi@0:                     reportMC(env.tree, MethodCheckDiag.INACCESSIBLE_VARARGS, inferenceContext, t, Kinds.kindName(location), location);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
aoqi@0:                 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
aoqi@0:             CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
aoqi@0:                 MethodCheckDiag methodDiag = varargsCheck ?
aoqi@0:                                  MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public void report(DiagnosticPosition pos, JCDiagnostic details) {
aoqi@0:                     reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
aoqi@0:                 }
aoqi@0:             };
aoqi@0:             return new MethodResultInfo(to, checkContext);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
aoqi@0:             return new MostSpecificCheck(strict, actuals);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             return "resolveMethodCheck";
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * This class handles method reference applicability checks; since during
aoqi@0:      * these checks it's sometime possible to have inference variables on
aoqi@0:      * the actual argument types list, the method applicability check must be
aoqi@0:      * extended so that inference variables are 'opened' as needed.
aoqi@0:      */
aoqi@0:     class MethodReferenceCheck extends AbstractMethodCheck {
aoqi@0: 
aoqi@0:         InferenceContext pendingInferenceContext;
aoqi@0: 
aoqi@0:         MethodReferenceCheck(InferenceContext pendingInferenceContext) {
aoqi@0:             this.pendingInferenceContext = pendingInferenceContext;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         void checkArg(DiagnosticPosition pos, boolean varargs, Type actual, Type formal, DeferredAttrContext deferredAttrContext, Warner warn) {
aoqi@0:             ResultInfo mresult = methodCheckResult(varargs, formal, deferredAttrContext, warn);
aoqi@0:             mresult.check(pos, actual);
aoqi@0:         }
aoqi@0: 
aoqi@0:         private ResultInfo methodCheckResult(final boolean varargsCheck, Type to,
aoqi@0:                 final DeferredAttr.DeferredAttrContext deferredAttrContext, Warner rsWarner) {
aoqi@0:             CheckContext checkContext = new MethodCheckContext(!deferredAttrContext.phase.isBoxingRequired(), deferredAttrContext, rsWarner) {
aoqi@0:                 MethodCheckDiag methodDiag = varargsCheck ?
aoqi@0:                                  MethodCheckDiag.VARARG_MISMATCH : MethodCheckDiag.ARG_MISMATCH;
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public boolean compatible(Type found, Type req, Warner warn) {
aoqi@0:                     found = pendingInferenceContext.asUndetVar(found);
aoqi@0:                     if (found.hasTag(UNDETVAR) && req.isPrimitive()) {
aoqi@0:                         req = types.boxedClass(req).type;
aoqi@0:                     }
aoqi@0:                     return super.compatible(found, req, warn);
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public void report(DiagnosticPosition pos, JCDiagnostic details) {
aoqi@0:                     reportMC(pos, methodDiag, deferredAttrContext.inferenceContext, details);
aoqi@0:                 }
aoqi@0:             };
aoqi@0:             return new MethodResultInfo(to, checkContext);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
aoqi@0:             return new MostSpecificCheck(strict, actuals);
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Check context to be used during method applicability checks. A method check
aoqi@0:      * context might contain inference variables.
aoqi@0:      */
aoqi@0:     abstract class MethodCheckContext implements CheckContext {
aoqi@0: 
aoqi@0:         boolean strict;
aoqi@0:         DeferredAttrContext deferredAttrContext;
aoqi@0:         Warner rsWarner;
aoqi@0: 
aoqi@0:         public MethodCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner) {
aoqi@0:            this.strict = strict;
aoqi@0:            this.deferredAttrContext = deferredAttrContext;
aoqi@0:            this.rsWarner = rsWarner;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean compatible(Type found, Type req, Warner warn) {
vromero@2543:             InferenceContext inferenceContext = deferredAttrContext.inferenceContext;
aoqi@0:             return strict ?
vromero@2543:                     types.isSubtypeUnchecked(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn) :
vromero@2543:                     types.isConvertible(inferenceContext.asUndetVar(found), inferenceContext.asUndetVar(req), warn);
aoqi@0:         }
aoqi@0: 
aoqi@0:         public void report(DiagnosticPosition pos, JCDiagnostic details) {
aoqi@0:             throw inapplicableMethodException.setMessage(details);
aoqi@0:         }
aoqi@0: 
aoqi@0:         public Warner checkWarner(DiagnosticPosition pos, Type found, Type req) {
aoqi@0:             return rsWarner;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public InferenceContext inferenceContext() {
aoqi@0:             return deferredAttrContext.inferenceContext;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public DeferredAttrContext deferredAttrContext() {
aoqi@0:             return deferredAttrContext;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             return "MethodReferenceCheck";
aoqi@0:         }
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * ResultInfo class to be used during method applicability checks. Check
aoqi@0:      * for deferred types goes through special path.
aoqi@0:      */
aoqi@0:     class MethodResultInfo extends ResultInfo {
aoqi@0: 
aoqi@0:         public MethodResultInfo(Type pt, CheckContext checkContext) {
aoqi@0:             attr.super(VAL, pt, checkContext);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Type check(DiagnosticPosition pos, Type found) {
aoqi@0:             if (found.hasTag(DEFERRED)) {
aoqi@0:                 DeferredType dt = (DeferredType)found;
aoqi@0:                 return dt.check(this);
aoqi@0:             } else {
rpatil@3092:                 Type uResult = U(found);
aoqi@0:                 Type capturedType = pos == null || pos.getTree() == null ?
aoqi@0:                         types.capture(uResult) :
aoqi@0:                         checkContext.inferenceContext()
aoqi@0:                             .cachedCapture(pos.getTree(), uResult, true);
aoqi@0:                 return super.check(pos, chk.checkNonVoid(pos, capturedType));
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * javac has a long-standing 'simplification' (see 6391995):
aoqi@0:          * given an actual argument type, the method check is performed
aoqi@0:          * on its upper bound. This leads to inconsistencies when an
aoqi@0:          * argument type is checked against itself. For example, given
aoqi@0:          * a type-variable T, it is not true that {@code U(T) <: T},
aoqi@0:          * so we need to guard against that.
aoqi@0:          */
aoqi@0:         private Type U(Type found) {
aoqi@0:             return found == pt ?
aoqi@0:                     found : types.cvarUpperBound(found);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected MethodResultInfo dup(Type newPt) {
aoqi@0:             return new MethodResultInfo(newPt, checkContext);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected ResultInfo dup(CheckContext newContext) {
aoqi@0:             return new MethodResultInfo(pt, newContext);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Most specific method applicability routine. Given a list of actual types A,
aoqi@0:      * a list of formal types F1, and a list of formal types F2, the routine determines
aoqi@0:      * as to whether the types in F1 can be considered more specific than those in F2 w.r.t.
aoqi@0:      * argument types A.
aoqi@0:      */
aoqi@0:     class MostSpecificCheck implements MethodCheck {
aoqi@0: 
aoqi@0:         boolean strict;
aoqi@0:         List<Type> actuals;
aoqi@0: 
aoqi@0:         MostSpecificCheck(boolean strict, List<Type> actuals) {
aoqi@0:             this.strict = strict;
aoqi@0:             this.actuals = actuals;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public void argumentsAcceptable(final Env<AttrContext> env,
aoqi@0:                                     DeferredAttrContext deferredAttrContext,
aoqi@0:                                     List<Type> formals1,
aoqi@0:                                     List<Type> formals2,
aoqi@0:                                     Warner warn) {
aoqi@0:             formals2 = adjustArgs(formals2, deferredAttrContext.msym, formals1.length(), deferredAttrContext.phase.isVarargsRequired());
aoqi@0:             while (formals2.nonEmpty()) {
aoqi@0:                 ResultInfo mresult = methodCheckResult(formals2.head, deferredAttrContext, warn, actuals.head);
aoqi@0:                 mresult.check(null, formals1.head);
aoqi@0:                 formals1 = formals1.tail;
aoqi@0:                 formals2 = formals2.tail;
aoqi@0:                 actuals = actuals.isEmpty() ? actuals : actuals.tail;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:        /**
aoqi@0:         * Create a method check context to be used during the most specific applicability check
aoqi@0:         */
aoqi@0:         ResultInfo methodCheckResult(Type to, DeferredAttr.DeferredAttrContext deferredAttrContext,
aoqi@0:                Warner rsWarner, Type actual) {
aoqi@0:            return attr.new ResultInfo(Kinds.VAL, to,
aoqi@0:                    new MostSpecificCheckContext(strict, deferredAttrContext, rsWarner, actual));
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Subclass of method check context class that implements most specific
aoqi@0:          * method conversion. If the actual type under analysis is a deferred type
aoqi@0:          * a full blown structural analysis is carried out.
aoqi@0:          */
aoqi@0:         class MostSpecificCheckContext extends MethodCheckContext {
aoqi@0: 
aoqi@0:             Type actual;
aoqi@0: 
aoqi@0:             public MostSpecificCheckContext(boolean strict, DeferredAttrContext deferredAttrContext, Warner rsWarner, Type actual) {
aoqi@0:                 super(strict, deferredAttrContext, rsWarner);
aoqi@0:                 this.actual = actual;
aoqi@0:             }
aoqi@0: 
aoqi@0:             public boolean compatible(Type found, Type req, Warner warn) {
aoqi@0:                 if (allowFunctionalInterfaceMostSpecific &&
aoqi@0:                         unrelatedFunctionalInterfaces(found, req) &&
aoqi@0:                         (actual != null && actual.getTag() == DEFERRED)) {
aoqi@0:                     DeferredType dt = (DeferredType) actual;
aoqi@0:                     DeferredType.SpeculativeCache.Entry e =
aoqi@0:                             dt.speculativeCache.get(deferredAttrContext.msym, deferredAttrContext.phase);
aoqi@0:                     if (e != null && e.speculativeTree != deferredAttr.stuckTree) {
aoqi@0:                         return functionalInterfaceMostSpecific(found, req, e.speculativeTree, warn);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 return super.compatible(found, req, warn);
aoqi@0:             }
aoqi@0: 
aoqi@0:             /** Whether {@code t} and {@code s} are unrelated functional interface types. */
aoqi@0:             private boolean unrelatedFunctionalInterfaces(Type t, Type s) {
aoqi@0:                 return types.isFunctionalInterface(t.tsym) &&
aoqi@0:                        types.isFunctionalInterface(s.tsym) &&
aoqi@0:                        types.asSuper(t, s.tsym) == null &&
aoqi@0:                        types.asSuper(s, t.tsym) == null;
aoqi@0:             }
aoqi@0: 
aoqi@0:             /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
aoqi@0:             private boolean functionalInterfaceMostSpecific(Type t, Type s, JCTree tree, Warner warn) {
aoqi@0:                 FunctionalInterfaceMostSpecificChecker msc = new FunctionalInterfaceMostSpecificChecker(t, s, warn);
aoqi@0:                 msc.scan(tree);
aoqi@0:                 return msc.result;
aoqi@0:             }
aoqi@0: 
aoqi@0:             /**
aoqi@0:              * Tests whether one functional interface type can be considered more specific
aoqi@0:              * than another unrelated functional interface type for the scanned expression.
aoqi@0:              */
aoqi@0:             class FunctionalInterfaceMostSpecificChecker extends DeferredAttr.PolyScanner {
aoqi@0: 
aoqi@0:                 final Type t;
aoqi@0:                 final Type s;
aoqi@0:                 final Warner warn;
aoqi@0:                 boolean result;
aoqi@0: 
aoqi@0:                 /** Parameters {@code t} and {@code s} are unrelated functional interface types. */
aoqi@0:                 FunctionalInterfaceMostSpecificChecker(Type t, Type s, Warner warn) {
aoqi@0:                     this.t = t;
aoqi@0:                     this.s = s;
aoqi@0:                     this.warn = warn;
aoqi@0:                     result = true;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 void skip(JCTree tree) {
aoqi@0:                     result &= false;
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public void visitConditional(JCConditional tree) {
aoqi@0:                     scan(tree.truepart);
aoqi@0:                     scan(tree.falsepart);
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public void visitReference(JCMemberReference tree) {
aoqi@0:                     Type desc_t = types.findDescriptorType(t);
aoqi@0:                     Type desc_s = types.findDescriptorType(s);
aoqi@0:                     // use inference variables here for more-specific inference (18.5.4)
aoqi@0:                     if (!types.isSameTypes(desc_t.getParameterTypes(),
aoqi@0:                             inferenceContext().asUndetVars(desc_s.getParameterTypes()))) {
aoqi@0:                         result &= false;
aoqi@0:                     } else {
aoqi@0:                         // compare return types
aoqi@0:                         Type ret_t = desc_t.getReturnType();
aoqi@0:                         Type ret_s = desc_s.getReturnType();
aoqi@0:                         if (ret_s.hasTag(VOID)) {
aoqi@0:                             result &= true;
aoqi@0:                         } else if (ret_t.hasTag(VOID)) {
aoqi@0:                             result &= false;
aoqi@0:                         } else if (ret_t.isPrimitive() != ret_s.isPrimitive()) {
aoqi@0:                             boolean retValIsPrimitive =
aoqi@0:                                     tree.refPolyKind == PolyKind.STANDALONE &&
aoqi@0:                                     tree.sym.type.getReturnType().isPrimitive();
aoqi@0:                             result &= (retValIsPrimitive == ret_t.isPrimitive()) &&
aoqi@0:                                       (retValIsPrimitive != ret_s.isPrimitive());
aoqi@0:                         } else {
aoqi@0:                             result &= MostSpecificCheckContext.super.compatible(ret_t, ret_s, warn);
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0: 
aoqi@0:                 @Override
aoqi@0:                 public void visitLambda(JCLambda tree) {
aoqi@0:                     Type desc_t = types.findDescriptorType(t);
aoqi@0:                     Type desc_s = types.findDescriptorType(s);
aoqi@0:                     // use inference variables here for more-specific inference (18.5.4)
aoqi@0:                     if (!types.isSameTypes(desc_t.getParameterTypes(),
aoqi@0:                             inferenceContext().asUndetVars(desc_s.getParameterTypes()))) {
aoqi@0:                         result &= false;
aoqi@0:                     } else {
aoqi@0:                         // compare return types
aoqi@0:                         Type ret_t = desc_t.getReturnType();
aoqi@0:                         Type ret_s = desc_s.getReturnType();
aoqi@0:                         if (ret_s.hasTag(VOID)) {
aoqi@0:                             result &= true;
aoqi@0:                         } else if (ret_t.hasTag(VOID)) {
aoqi@0:                             result &= false;
aoqi@0:                         } else if (unrelatedFunctionalInterfaces(ret_t, ret_s)) {
aoqi@0:                             for (JCExpression expr : lambdaResults(tree)) {
aoqi@0:                                 result &= functionalInterfaceMostSpecific(ret_t, ret_s, expr, warn);
aoqi@0:                             }
aoqi@0:                         } else if (ret_t.isPrimitive() != ret_s.isPrimitive()) {
aoqi@0:                             for (JCExpression expr : lambdaResults(tree)) {
aoqi@0:                                 boolean retValIsPrimitive = expr.isStandalone() && expr.type.isPrimitive();
aoqi@0:                                 result &= (retValIsPrimitive == ret_t.isPrimitive()) &&
aoqi@0:                                           (retValIsPrimitive != ret_s.isPrimitive());
aoqi@0:                             }
aoqi@0:                         } else {
aoqi@0:                             result &= MostSpecificCheckContext.super.compatible(ret_t, ret_s, warn);
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 //where
aoqi@0: 
aoqi@0:                 private List<JCExpression> lambdaResults(JCLambda lambda) {
aoqi@0:                     if (lambda.getBodyKind() == JCTree.JCLambda.BodyKind.EXPRESSION) {
aoqi@0:                         return List.of((JCExpression) lambda.body);
aoqi@0:                     } else {
aoqi@0:                         final ListBuffer<JCExpression> buffer = new ListBuffer<>();
aoqi@0:                         DeferredAttr.LambdaReturnScanner lambdaScanner =
aoqi@0:                                 new DeferredAttr.LambdaReturnScanner() {
aoqi@0:                                     @Override
aoqi@0:                                     public void visitReturn(JCReturn tree) {
aoqi@0:                                         if (tree.expr != null) {
aoqi@0:                                             buffer.append(tree.expr);
aoqi@0:                                         }
aoqi@0:                                     }
aoqi@0:                                 };
aoqi@0:                         lambdaScanner.scan(lambda.body);
aoqi@0:                         return buffer.toList();
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0: 
aoqi@0:         }
aoqi@0: 
aoqi@0:         public MethodCheck mostSpecificCheck(List<Type> actuals, boolean strict) {
aoqi@0:             Assert.error("Cannot get here!");
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static class InapplicableMethodException extends RuntimeException {
aoqi@0:         private static final long serialVersionUID = 0;
aoqi@0: 
aoqi@0:         JCDiagnostic diagnostic;
aoqi@0:         JCDiagnostic.Factory diags;
aoqi@0: 
aoqi@0:         InapplicableMethodException(JCDiagnostic.Factory diags) {
aoqi@0:             this.diagnostic = null;
aoqi@0:             this.diags = diags;
aoqi@0:         }
aoqi@0:         InapplicableMethodException setMessage() {
aoqi@0:             return setMessage((JCDiagnostic)null);
aoqi@0:         }
aoqi@0:         InapplicableMethodException setMessage(String key) {
aoqi@0:             return setMessage(key != null ? diags.fragment(key) : null);
aoqi@0:         }
aoqi@0:         InapplicableMethodException setMessage(String key, Object... args) {
aoqi@0:             return setMessage(key != null ? diags.fragment(key, args) : null);
aoqi@0:         }
aoqi@0:         InapplicableMethodException setMessage(JCDiagnostic diag) {
aoqi@0:             this.diagnostic = diag;
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public JCDiagnostic getDiagnostic() {
aoqi@0:             return diagnostic;
aoqi@0:         }
aoqi@0:     }
aoqi@0:     private final InapplicableMethodException inapplicableMethodException;
aoqi@0: 
aoqi@0: /* ***************************************************************************
aoqi@0:  *  Symbol lookup
aoqi@0:  *  the following naming conventions for arguments are used
aoqi@0:  *
aoqi@0:  *       env      is the environment where the symbol was mentioned
aoqi@0:  *       site     is the type of which the symbol is a member
aoqi@0:  *       name     is the symbol's name
aoqi@0:  *                if no arguments are given
aoqi@0:  *       argtypes are the value arguments, if we search for a method
aoqi@0:  *
aoqi@0:  *  If no symbol was found, a ResolveError detailing the problem is returned.
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** Find field. Synthetic fields are always skipped.
aoqi@0:      *  @param env     The current environment.
aoqi@0:      *  @param site    The original type from where the selection takes place.
aoqi@0:      *  @param name    The name of the field.
aoqi@0:      *  @param c       The class to search for the field. This is always
aoqi@0:      *                 a superclass or implemented interface of site's class.
aoqi@0:      */
aoqi@0:     Symbol findField(Env<AttrContext> env,
aoqi@0:                      Type site,
aoqi@0:                      Name name,
aoqi@0:                      TypeSymbol c) {
aoqi@0:         while (c.type.hasTag(TYPEVAR))
aoqi@0:             c = c.type.getUpperBound().tsym;
aoqi@0:         Symbol bestSoFar = varNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         Scope.Entry e = c.members().lookup(name);
aoqi@0:         while (e.scope != null) {
aoqi@0:             if (e.sym.kind == VAR && (e.sym.flags_field & SYNTHETIC) == 0) {
aoqi@0:                 return isAccessible(env, site, e.sym)
aoqi@0:                     ? e.sym : new AccessError(env, site, e.sym);
aoqi@0:             }
aoqi@0:             e = e.next();
aoqi@0:         }
aoqi@0:         Type st = types.supertype(c.type);
aoqi@0:         if (st != null && (st.hasTag(CLASS) || st.hasTag(TYPEVAR))) {
aoqi@0:             sym = findField(env, site, name, st.tsym);
aoqi@0:             if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0:         for (List<Type> l = types.interfaces(c.type);
aoqi@0:              bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
aoqi@0:              l = l.tail) {
aoqi@0:             sym = findField(env, site, name, l.head.tsym);
aoqi@0:             if (bestSoFar.exists() && sym.exists() &&
aoqi@0:                 sym.owner != bestSoFar.owner)
aoqi@0:                 bestSoFar = new AmbiguityError(bestSoFar, sym);
aoqi@0:             else if (sym.kind < bestSoFar.kind)
aoqi@0:                 bestSoFar = sym;
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve a field identifier, throw a fatal error if not found.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the method invocation.
aoqi@0:      *  @param site      The type of the qualifying expression, in which
aoqi@0:      *                   identifier is searched.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      */
aoqi@0:     public VarSymbol resolveInternalField(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                           Type site, Name name) {
aoqi@0:         Symbol sym = findField(env, site, name, site.tsym);
aoqi@0:         if (sym.kind == VAR) return (VarSymbol)sym;
aoqi@0:         else throw new FatalError(
aoqi@0:                  diags.fragment("fatal.err.cant.locate.field",
aoqi@0:                                 name));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find unqualified variable or field with given name.
aoqi@0:      *  Synthetic fields always skipped.
aoqi@0:      *  @param env     The current environment.
aoqi@0:      *  @param name    The name of the variable or field.
aoqi@0:      */
aoqi@0:     Symbol findVar(Env<AttrContext> env, Name name) {
aoqi@0:         Symbol bestSoFar = varNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         Env<AttrContext> env1 = env;
aoqi@0:         boolean staticOnly = false;
aoqi@0:         while (env1.outer != null) {
aoqi@0:             if (isStatic(env1)) staticOnly = true;
aoqi@0:             Scope.Entry e = env1.info.scope.lookup(name);
aoqi@0:             while (e.scope != null &&
aoqi@0:                    (e.sym.kind != VAR ||
aoqi@0:                     (e.sym.flags_field & SYNTHETIC) != 0))
aoqi@0:                 e = e.next();
aoqi@0:             sym = (e.scope != null)
aoqi@0:                 ? e.sym
aoqi@0:                 : findField(
aoqi@0:                     env1, env1.enclClass.sym.type, name, env1.enclClass.sym);
aoqi@0:             if (sym.exists()) {
aoqi@0:                 if (staticOnly &&
aoqi@0:                     sym.kind == VAR &&
aoqi@0:                     sym.owner.kind == TYP &&
aoqi@0:                     (sym.flags() & STATIC) == 0)
aoqi@0:                     return new StaticError(sym);
aoqi@0:                 else
aoqi@0:                     return sym;
aoqi@0:             } else if (sym.kind < bestSoFar.kind) {
aoqi@0:                 bestSoFar = sym;
aoqi@0:             }
aoqi@0: 
aoqi@0:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
aoqi@0:             env1 = env1.outer;
aoqi@0:         }
aoqi@0: 
aoqi@0:         sym = findField(env, syms.predefClass.type, name, syms.predefClass);
aoqi@0:         if (sym.exists())
aoqi@0:             return sym;
aoqi@0:         if (bestSoFar.exists())
aoqi@0:             return bestSoFar;
aoqi@0: 
aoqi@0:         Symbol origin = null;
aoqi@0:         for (Scope sc : new Scope[] { env.toplevel.namedImportScope, env.toplevel.starImportScope }) {
aoqi@0:             Scope.Entry e = sc.lookup(name);
aoqi@0:             for (; e.scope != null; e = e.next()) {
aoqi@0:                 sym = e.sym;
aoqi@0:                 if (sym.kind != VAR)
aoqi@0:                     continue;
aoqi@0:                 // invariant: sym.kind == VAR
aoqi@0:                 if (bestSoFar.kind < AMBIGUOUS && sym.owner != bestSoFar.owner)
aoqi@0:                     return new AmbiguityError(bestSoFar, sym);
aoqi@0:                 else if (bestSoFar.kind >= VAR) {
aoqi@0:                     origin = e.getOrigin().owner;
aoqi@0:                     bestSoFar = isAccessible(env, origin.type, sym)
aoqi@0:                         ? sym : new AccessError(env, origin.type, sym);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (bestSoFar.exists()) break;
aoqi@0:         }
aoqi@0:         if (bestSoFar.kind == VAR && bestSoFar.owner.type != origin.type)
aoqi@0:             return bestSoFar.clone(origin);
aoqi@0:         else
aoqi@0:             return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     Warner noteWarner = new Warner();
aoqi@0: 
aoqi@0:     /** Select the best method for a call site among two choices.
aoqi@0:      *  @param env              The current environment.
aoqi@0:      *  @param site             The original type from where the
aoqi@0:      *                          selection takes place.
aoqi@0:      *  @param argtypes         The invocation's value arguments,
aoqi@0:      *  @param typeargtypes     The invocation's type arguments,
aoqi@0:      *  @param sym              Proposed new best match.
aoqi@0:      *  @param bestSoFar        Previously found best match.
aoqi@0:      *  @param allowBoxing Allow boxing conversions of arguments.
aoqi@0:      *  @param useVarargs Box trailing arguments into an array for varargs.
aoqi@0:      */
aoqi@0:     @SuppressWarnings("fallthrough")
aoqi@0:     Symbol selectBest(Env<AttrContext> env,
aoqi@0:                       Type site,
aoqi@0:                       List<Type> argtypes,
aoqi@0:                       List<Type> typeargtypes,
aoqi@0:                       Symbol sym,
aoqi@0:                       Symbol bestSoFar,
aoqi@0:                       boolean allowBoxing,
aoqi@0:                       boolean useVarargs,
aoqi@0:                       boolean operator) {
aoqi@0:         if (sym.kind == ERR ||
aoqi@0:                 !sym.isInheritedIn(site.tsym, types)) {
aoqi@0:             return bestSoFar;
aoqi@0:         } else if (useVarargs && (sym.flags() & VARARGS) == 0) {
aoqi@0:             return bestSoFar.kind >= ERRONEOUS ?
aoqi@0:                     new BadVarargsMethod((ResolveError)bestSoFar.baseSymbol()) :
aoqi@0:                     bestSoFar;
aoqi@0:         }
aoqi@0:         Assert.check(sym.kind < AMBIGUOUS);
aoqi@0:         try {
aoqi@0:             Type mt = rawInstantiate(env, site, sym, null, argtypes, typeargtypes,
aoqi@0:                                allowBoxing, useVarargs, types.noWarnings);
aoqi@0:             if (!operator || verboseResolutionMode.contains(VerboseResolutionMode.PREDEF))
aoqi@0:                 currentResolutionContext.addApplicableCandidate(sym, mt);
aoqi@0:         } catch (InapplicableMethodException ex) {
aoqi@0:             if (!operator)
aoqi@0:                 currentResolutionContext.addInapplicableCandidate(sym, ex.getDiagnostic());
aoqi@0:             switch (bestSoFar.kind) {
aoqi@0:                 case ABSENT_MTH:
aoqi@0:                     return new InapplicableSymbolError(currentResolutionContext);
aoqi@0:                 case WRONG_MTH:
aoqi@0:                     if (operator) return bestSoFar;
aoqi@0:                     bestSoFar = new InapplicableSymbolsError(currentResolutionContext);
aoqi@0:                 default:
aoqi@0:                     return bestSoFar;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         if (!isAccessible(env, site, sym)) {
aoqi@0:             return (bestSoFar.kind == ABSENT_MTH)
aoqi@0:                 ? new AccessError(env, site, sym)
aoqi@0:                 : bestSoFar;
aoqi@0:         }
aoqi@0:         return (bestSoFar.kind > AMBIGUOUS)
aoqi@0:             ? sym
aoqi@0:             : mostSpecific(argtypes, sym, bestSoFar, env, site,
aoqi@0:                            allowBoxing && operator, useVarargs);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /* Return the most specific of the two methods for a call,
aoqi@0:      *  given that both are accessible and applicable.
aoqi@0:      *  @param m1               A new candidate for most specific.
aoqi@0:      *  @param m2               The previous most specific candidate.
aoqi@0:      *  @param env              The current environment.
aoqi@0:      *  @param site             The original type from where the selection
aoqi@0:      *                          takes place.
aoqi@0:      *  @param allowBoxing Allow boxing conversions of arguments.
aoqi@0:      *  @param useVarargs Box trailing arguments into an array for varargs.
aoqi@0:      */
aoqi@0:     Symbol mostSpecific(List<Type> argtypes, Symbol m1,
aoqi@0:                         Symbol m2,
aoqi@0:                         Env<AttrContext> env,
aoqi@0:                         final Type site,
aoqi@0:                         boolean allowBoxing,
aoqi@0:                         boolean useVarargs) {
aoqi@0:         switch (m2.kind) {
aoqi@0:         case MTH:
aoqi@0:             if (m1 == m2) return m1;
aoqi@0:             boolean m1SignatureMoreSpecific =
aoqi@0:                     signatureMoreSpecific(argtypes, env, site, m1, m2, allowBoxing, useVarargs);
aoqi@0:             boolean m2SignatureMoreSpecific =
aoqi@0:                     signatureMoreSpecific(argtypes, env, site, m2, m1, allowBoxing, useVarargs);
aoqi@0:             if (m1SignatureMoreSpecific && m2SignatureMoreSpecific) {
aoqi@0:                 Type mt1 = types.memberType(site, m1);
aoqi@0:                 Type mt2 = types.memberType(site, m2);
aoqi@0:                 if (!types.overrideEquivalent(mt1, mt2))
aoqi@0:                     return ambiguityError(m1, m2);
aoqi@0: 
aoqi@0:                 // same signature; select (a) the non-bridge method, or
aoqi@0:                 // (b) the one that overrides the other, or (c) the concrete
aoqi@0:                 // one, or (d) merge both abstract signatures
aoqi@0:                 if ((m1.flags() & BRIDGE) != (m2.flags() & BRIDGE))
aoqi@0:                     return ((m1.flags() & BRIDGE) != 0) ? m2 : m1;
aoqi@0: 
aoqi@0:                 // if one overrides or hides the other, use it
aoqi@0:                 TypeSymbol m1Owner = (TypeSymbol)m1.owner;
aoqi@0:                 TypeSymbol m2Owner = (TypeSymbol)m2.owner;
aoqi@0:                 if (types.asSuper(m1Owner.type, m2Owner) != null &&
aoqi@0:                     ((m1.owner.flags_field & INTERFACE) == 0 ||
aoqi@0:                      (m2.owner.flags_field & INTERFACE) != 0) &&
aoqi@0:                     m1.overrides(m2, m1Owner, types, false))
aoqi@0:                     return m1;
aoqi@0:                 if (types.asSuper(m2Owner.type, m1Owner) != null &&
aoqi@0:                     ((m2.owner.flags_field & INTERFACE) == 0 ||
aoqi@0:                      (m1.owner.flags_field & INTERFACE) != 0) &&
aoqi@0:                     m2.overrides(m1, m2Owner, types, false))
aoqi@0:                     return m2;
aoqi@0:                 boolean m1Abstract = (m1.flags() & ABSTRACT) != 0;
aoqi@0:                 boolean m2Abstract = (m2.flags() & ABSTRACT) != 0;
aoqi@0:                 if (m1Abstract && !m2Abstract) return m2;
aoqi@0:                 if (m2Abstract && !m1Abstract) return m1;
aoqi@0:                 // both abstract or both concrete
aoqi@0:                 return ambiguityError(m1, m2);
aoqi@0:             }
aoqi@0:             if (m1SignatureMoreSpecific) return m1;
aoqi@0:             if (m2SignatureMoreSpecific) return m2;
aoqi@0:             return ambiguityError(m1, m2);
aoqi@0:         case AMBIGUOUS:
aoqi@0:             //compare m1 to ambiguous methods in m2
aoqi@0:             AmbiguityError e = (AmbiguityError)m2.baseSymbol();
aoqi@0:             boolean m1MoreSpecificThanAnyAmbiguous = true;
aoqi@0:             boolean allAmbiguousMoreSpecificThanM1 = true;
aoqi@0:             for (Symbol s : e.ambiguousSyms) {
aoqi@0:                 Symbol moreSpecific = mostSpecific(argtypes, m1, s, env, site, allowBoxing, useVarargs);
aoqi@0:                 m1MoreSpecificThanAnyAmbiguous &= moreSpecific == m1;
aoqi@0:                 allAmbiguousMoreSpecificThanM1 &= moreSpecific == s;
aoqi@0:             }
aoqi@0:             if (m1MoreSpecificThanAnyAmbiguous)
aoqi@0:                 return m1;
aoqi@0:             //if m1 is more specific than some ambiguous methods, but other ambiguous methods are
aoqi@0:             //more specific than m1, add it as a new ambiguous method:
aoqi@0:             if (!allAmbiguousMoreSpecificThanM1)
aoqi@0:                 e.addAmbiguousSymbol(m1);
aoqi@0:             return e;
aoqi@0:         default:
aoqi@0:             throw new AssertionError();
aoqi@0:         }
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     private boolean signatureMoreSpecific(List<Type> actuals, Env<AttrContext> env, Type site, Symbol m1, Symbol m2, boolean allowBoxing, boolean useVarargs) {
aoqi@0:         noteWarner.clear();
aoqi@0:         int maxLength = Math.max(
aoqi@0:                             Math.max(m1.type.getParameterTypes().length(), actuals.length()),
aoqi@0:                             m2.type.getParameterTypes().length());
aoqi@0:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
aoqi@0:         try {
aoqi@0:             currentResolutionContext = new MethodResolutionContext();
aoqi@0:             currentResolutionContext.step = prevResolutionContext.step;
aoqi@0:             currentResolutionContext.methodCheck =
aoqi@0:                     prevResolutionContext.methodCheck.mostSpecificCheck(actuals, !allowBoxing);
aoqi@0:             Type mst = instantiate(env, site, m2, null,
aoqi@0:                     adjustArgs(types.cvarLowerBounds(types.memberType(site, m1).getParameterTypes()), m1, maxLength, useVarargs), null,
aoqi@0:                     allowBoxing, useVarargs, noteWarner);
aoqi@0:             return mst != null &&
aoqi@0:                     !noteWarner.hasLint(Lint.LintCategory.UNCHECKED);
aoqi@0:         } finally {
aoqi@0:             currentResolutionContext = prevResolutionContext;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     List<Type> adjustArgs(List<Type> args, Symbol msym, int length, boolean allowVarargs) {
aoqi@0:         if ((msym.flags() & VARARGS) != 0 && allowVarargs) {
aoqi@0:             Type varargsElem = types.elemtype(args.last());
aoqi@0:             if (varargsElem == null) {
aoqi@0:                 Assert.error("Bad varargs = " + args.last() + " " + msym);
aoqi@0:             }
aoqi@0:             List<Type> newArgs = args.reverse().tail.prepend(varargsElem).reverse();
aoqi@0:             while (newArgs.length() < length) {
aoqi@0:                 newArgs = newArgs.append(newArgs.last());
aoqi@0:             }
aoqi@0:             return newArgs;
aoqi@0:         } else {
aoqi@0:             return args;
aoqi@0:         }
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     Type mostSpecificReturnType(Type mt1, Type mt2) {
aoqi@0:         Type rt1 = mt1.getReturnType();
aoqi@0:         Type rt2 = mt2.getReturnType();
aoqi@0: 
aoqi@0:         if (mt1.hasTag(FORALL) && mt2.hasTag(FORALL)) {
aoqi@0:             //if both are generic methods, adjust return type ahead of subtyping check
aoqi@0:             rt1 = types.subst(rt1, mt1.getTypeArguments(), mt2.getTypeArguments());
aoqi@0:         }
aoqi@0:         //first use subtyping, then return type substitutability
aoqi@0:         if (types.isSubtype(rt1, rt2)) {
aoqi@0:             return mt1;
aoqi@0:         } else if (types.isSubtype(rt2, rt1)) {
aoqi@0:             return mt2;
aoqi@0:         } else if (types.returnTypeSubstitutable(mt1, mt2)) {
aoqi@0:             return mt1;
aoqi@0:         } else if (types.returnTypeSubstitutable(mt2, mt1)) {
aoqi@0:             return mt2;
aoqi@0:         } else {
aoqi@0:             return null;
aoqi@0:         }
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     Symbol ambiguityError(Symbol m1, Symbol m2) {
aoqi@0:         if (((m1.flags() | m2.flags()) & CLASH) != 0) {
aoqi@0:             return (m1.flags() & CLASH) == 0 ? m1 : m2;
aoqi@0:         } else {
aoqi@0:             return new AmbiguityError(m1, m2);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol findMethodInScope(Env<AttrContext> env,
aoqi@0:             Type site,
aoqi@0:             Name name,
aoqi@0:             List<Type> argtypes,
aoqi@0:             List<Type> typeargtypes,
aoqi@0:             Scope sc,
aoqi@0:             Symbol bestSoFar,
aoqi@0:             boolean allowBoxing,
aoqi@0:             boolean useVarargs,
aoqi@0:             boolean operator,
aoqi@0:             boolean abstractok) {
aoqi@0:         for (Symbol s : sc.getElementsByName(name, new LookupFilter(abstractok))) {
aoqi@0:             bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
aoqi@0:                     bestSoFar, allowBoxing, useVarargs, operator);
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0:     //where
aoqi@0:         class LookupFilter implements Filter<Symbol> {
aoqi@0: 
aoqi@0:             boolean abstractOk;
aoqi@0: 
aoqi@0:             LookupFilter(boolean abstractOk) {
aoqi@0:                 this.abstractOk = abstractOk;
aoqi@0:             }
aoqi@0: 
aoqi@0:             public boolean accepts(Symbol s) {
aoqi@0:                 long flags = s.flags();
aoqi@0:                 return s.kind == MTH &&
aoqi@0:                         (flags & SYNTHETIC) == 0 &&
aoqi@0:                         (abstractOk ||
aoqi@0:                         (flags & DEFAULT) != 0 ||
aoqi@0:                         (flags & ABSTRACT) == 0);
aoqi@0:             }
aoqi@0:         };
aoqi@0: 
aoqi@0:     /** Find best qualified method matching given name, type and value
aoqi@0:      *  arguments.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param site      The original type from where the selection
aoqi@0:      *                   takes place.
aoqi@0:      *  @param name      The method's name.
aoqi@0:      *  @param argtypes  The method's value arguments.
aoqi@0:      *  @param typeargtypes The method's type arguments
aoqi@0:      *  @param allowBoxing Allow boxing conversions of arguments.
aoqi@0:      *  @param useVarargs Box trailing arguments into an array for varargs.
aoqi@0:      */
aoqi@0:     Symbol findMethod(Env<AttrContext> env,
aoqi@0:                       Type site,
aoqi@0:                       Name name,
aoqi@0:                       List<Type> argtypes,
aoqi@0:                       List<Type> typeargtypes,
aoqi@0:                       boolean allowBoxing,
aoqi@0:                       boolean useVarargs,
aoqi@0:                       boolean operator) {
aoqi@0:         Symbol bestSoFar = methodNotFound;
aoqi@0:         bestSoFar = findMethod(env,
aoqi@0:                           site,
aoqi@0:                           name,
aoqi@0:                           argtypes,
aoqi@0:                           typeargtypes,
aoqi@0:                           site.tsym.type,
aoqi@0:                           bestSoFar,
aoqi@0:                           allowBoxing,
aoqi@0:                           useVarargs,
aoqi@0:                           operator);
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0:     // where
aoqi@0:     private Symbol findMethod(Env<AttrContext> env,
aoqi@0:                               Type site,
aoqi@0:                               Name name,
aoqi@0:                               List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes,
aoqi@0:                               Type intype,
aoqi@0:                               Symbol bestSoFar,
aoqi@0:                               boolean allowBoxing,
aoqi@0:                               boolean useVarargs,
aoqi@0:                               boolean operator) {
aoqi@0:         @SuppressWarnings({"unchecked","rawtypes"})
aoqi@0:         List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
aoqi@0:         InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
aoqi@0:         for (TypeSymbol s : superclasses(intype)) {
aoqi@0:             bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
aoqi@0:                     s.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
aoqi@0:             if (name == names.init) return bestSoFar;
aoqi@0:             iphase = (iphase == null) ? null : iphase.update(s, this);
aoqi@0:             if (iphase != null) {
aoqi@0:                 for (Type itype : types.interfaces(s.type)) {
aoqi@0:                     itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         Symbol concrete = bestSoFar.kind < ERR &&
aoqi@0:                 (bestSoFar.flags() & ABSTRACT) == 0 ?
aoqi@0:                 bestSoFar : methodNotFound;
aoqi@0: 
aoqi@0:         for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
aoqi@0:             //keep searching for abstract methods
aoqi@0:             for (Type itype : itypes[iphase2.ordinal()]) {
aoqi@0:                 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
aoqi@0:                 if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
aoqi@0:                         (itype.tsym.flags() & DEFAULT) == 0) continue;
aoqi@0:                 bestSoFar = findMethodInScope(env, site, name, argtypes, typeargtypes,
aoqi@0:                         itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
aoqi@0:                 if (concrete != bestSoFar &&
aoqi@0:                         concrete.kind < ERR  && bestSoFar.kind < ERR &&
aoqi@0:                         types.isSubSignature(concrete.type, bestSoFar.type)) {
aoqi@0:                     //this is an hack - as javac does not do full membership checks
aoqi@0:                     //most specific ends up comparing abstract methods that might have
aoqi@0:                     //been implemented by some concrete method in a subclass and,
aoqi@0:                     //because of raw override, it is possible for an abstract method
aoqi@0:                     //to be more specific than the concrete method - so we need
aoqi@0:                     //to explicitly call that out (see CR 6178365)
aoqi@0:                     bestSoFar = concrete;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     enum InterfaceLookupPhase {
aoqi@0:         ABSTRACT_OK() {
aoqi@0:             @Override
aoqi@0:             InterfaceLookupPhase update(Symbol s, Resolve rs) {
aoqi@0:                 //We should not look for abstract methods if receiver is a concrete class
aoqi@0:                 //(as concrete classes are expected to implement all abstracts coming
aoqi@0:                 //from superinterfaces)
aoqi@0:                 if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
aoqi@0:                     return this;
aoqi@0:                 } else {
aoqi@0:                     return DEFAULT_OK;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         },
aoqi@0:         DEFAULT_OK() {
aoqi@0:             @Override
aoqi@0:             InterfaceLookupPhase update(Symbol s, Resolve rs) {
aoqi@0:                 return this;
aoqi@0:             }
aoqi@0:         };
aoqi@0: 
aoqi@0:         abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Return an Iterable object to scan the superclasses of a given type.
aoqi@0:      * It's crucial that the scan is done lazily, as we don't want to accidentally
aoqi@0:      * access more supertypes than strictly needed (as this could trigger completion
aoqi@0:      * errors if some of the not-needed supertypes are missing/ill-formed).
aoqi@0:      */
aoqi@0:     Iterable<TypeSymbol> superclasses(final Type intype) {
aoqi@0:         return new Iterable<TypeSymbol>() {
aoqi@0:             public Iterator<TypeSymbol> iterator() {
aoqi@0:                 return new Iterator<TypeSymbol>() {
aoqi@0: 
aoqi@0:                     List<TypeSymbol> seen = List.nil();
aoqi@0:                     TypeSymbol currentSym = symbolFor(intype);
aoqi@0:                     TypeSymbol prevSym = null;
aoqi@0: 
aoqi@0:                     public boolean hasNext() {
aoqi@0:                         if (currentSym == syms.noSymbol) {
aoqi@0:                             currentSym = symbolFor(types.supertype(prevSym.type));
aoqi@0:                         }
aoqi@0:                         return currentSym != null;
aoqi@0:                     }
aoqi@0: 
aoqi@0:                     public TypeSymbol next() {
aoqi@0:                         prevSym = currentSym;
aoqi@0:                         currentSym = syms.noSymbol;
aoqi@0:                         Assert.check(prevSym != null || prevSym != syms.noSymbol);
aoqi@0:                         return prevSym;
aoqi@0:                     }
aoqi@0: 
aoqi@0:                     public void remove() {
aoqi@0:                         throw new UnsupportedOperationException();
aoqi@0:                     }
aoqi@0: 
aoqi@0:                     TypeSymbol symbolFor(Type t) {
aoqi@0:                         if (!t.hasTag(CLASS) &&
aoqi@0:                                 !t.hasTag(TYPEVAR)) {
aoqi@0:                             return null;
aoqi@0:                         }
aoqi@0:                         while (t.hasTag(TYPEVAR))
aoqi@0:                             t = t.getUpperBound();
aoqi@0:                         if (seen.contains(t.tsym)) {
aoqi@0:                             //degenerate case in which we have a circular
aoqi@0:                             //class hierarchy - because of ill-formed classfiles
aoqi@0:                             return null;
aoqi@0:                         }
aoqi@0:                         seen = seen.prepend(t.tsym);
aoqi@0:                         return t.tsym;
aoqi@0:                     }
aoqi@0:                 };
aoqi@0:             }
aoqi@0:         };
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find unqualified method matching given name, type and value arguments.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param name      The method's name.
aoqi@0:      *  @param argtypes  The method's value arguments.
aoqi@0:      *  @param typeargtypes  The method's type arguments.
aoqi@0:      *  @param allowBoxing Allow boxing conversions of arguments.
aoqi@0:      *  @param useVarargs Box trailing arguments into an array for varargs.
aoqi@0:      */
aoqi@0:     Symbol findFun(Env<AttrContext> env, Name name,
aoqi@0:                    List<Type> argtypes, List<Type> typeargtypes,
aoqi@0:                    boolean allowBoxing, boolean useVarargs) {
aoqi@0:         Symbol bestSoFar = methodNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         Env<AttrContext> env1 = env;
aoqi@0:         boolean staticOnly = false;
aoqi@0:         while (env1.outer != null) {
aoqi@0:             if (isStatic(env1)) staticOnly = true;
sadayapalam@3005:             Assert.check(env1.info.preferredTreeForDiagnostics == null);
sadayapalam@3005:             env1.info.preferredTreeForDiagnostics = env.tree;
sadayapalam@3005:             try {
sadayapalam@3005:                 sym = findMethod(
sadayapalam@3005:                     env1, env1.enclClass.sym.type, name, argtypes, typeargtypes,
sadayapalam@3005:                     allowBoxing, useVarargs, false);
sadayapalam@3005:                 if (sym.exists()) {
sadayapalam@3005:                     if (staticOnly &&
sadayapalam@3005:                         sym.kind == MTH &&
sadayapalam@3005:                         sym.owner.kind == TYP &&
sadayapalam@3005:                         (sym.flags() & STATIC) == 0) return new StaticError(sym);
sadayapalam@3005:                     else return sym;
sadayapalam@3005:                 } else if (sym.kind < bestSoFar.kind) {
sadayapalam@3005:                     bestSoFar = sym;
sadayapalam@3005:                 }
sadayapalam@3005:             } finally {
sadayapalam@3005:                 env1.info.preferredTreeForDiagnostics = null;
aoqi@0:             }
aoqi@0:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
aoqi@0:             env1 = env1.outer;
aoqi@0:         }
aoqi@0: 
aoqi@0:         sym = findMethod(env, syms.predefClass.type, name, argtypes,
aoqi@0:                          typeargtypes, allowBoxing, useVarargs, false);
aoqi@0:         if (sym.exists())
aoqi@0:             return sym;
aoqi@0: 
aoqi@0:         Scope.Entry e = env.toplevel.namedImportScope.lookup(name);
aoqi@0:         for (; e.scope != null; e = e.next()) {
aoqi@0:             sym = e.sym;
aoqi@0:             Type origin = e.getOrigin().owner.type;
aoqi@0:             if (sym.kind == MTH) {
aoqi@0:                 if (e.sym.owner.type != origin)
aoqi@0:                     sym = sym.clone(e.getOrigin().owner);
aoqi@0:                 if (!isAccessible(env, origin, sym))
aoqi@0:                     sym = new AccessError(env, origin, sym);
aoqi@0:                 bestSoFar = selectBest(env, origin,
aoqi@0:                                        argtypes, typeargtypes,
aoqi@0:                                        sym, bestSoFar,
aoqi@0:                                        allowBoxing, useVarargs, false);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         if (bestSoFar.exists())
aoqi@0:             return bestSoFar;
aoqi@0: 
aoqi@0:         e = env.toplevel.starImportScope.lookup(name);
aoqi@0:         for (; e.scope != null; e = e.next()) {
aoqi@0:             sym = e.sym;
aoqi@0:             Type origin = e.getOrigin().owner.type;
aoqi@0:             if (sym.kind == MTH) {
aoqi@0:                 if (e.sym.owner.type != origin)
aoqi@0:                     sym = sym.clone(e.getOrigin().owner);
aoqi@0:                 if (!isAccessible(env, origin, sym))
aoqi@0:                     sym = new AccessError(env, origin, sym);
aoqi@0:                 bestSoFar = selectBest(env, origin,
aoqi@0:                                        argtypes, typeargtypes,
aoqi@0:                                        sym, bestSoFar,
aoqi@0:                                        allowBoxing, useVarargs, false);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Load toplevel or member class with given fully qualified name and
aoqi@0:      *  verify that it is accessible.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param name      The fully qualified name of the class to be loaded.
aoqi@0:      */
aoqi@0:     Symbol loadClass(Env<AttrContext> env, Name name) {
aoqi@0:         try {
aoqi@0:             ClassSymbol c = reader.loadClass(name);
aoqi@0:             return isAccessible(env, c) ? c : new AccessError(c);
aoqi@0:         } catch (ClassReader.BadClassFile err) {
aoqi@0:             throw err;
aoqi@0:         } catch (CompletionFailure ex) {
aoqi@0:             return typeNotFound;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Find a type declared in a scope (not inherited).  Return null
aoqi@0:      * if none is found.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param site      The original type from where the selection takes
aoqi@0:      *                   place.
aoqi@0:      *  @param name      The type's name.
aoqi@0:      *  @param c         The class to search for the member type. This is
aoqi@0:      *                   always a superclass or implemented interface of
aoqi@0:      *                   site's class.
aoqi@0:      */
aoqi@0:     Symbol findImmediateMemberType(Env<AttrContext> env,
aoqi@0:                                    Type site,
aoqi@0:                                    Name name,
aoqi@0:                                    TypeSymbol c) {
aoqi@0:         Scope.Entry e = c.members().lookup(name);
aoqi@0:         while (e.scope != null) {
aoqi@0:             if (e.sym.kind == TYP) {
aoqi@0:                 return isAccessible(env, site, e.sym)
aoqi@0:                     ? e.sym
aoqi@0:                     : new AccessError(env, site, e.sym);
aoqi@0:             }
aoqi@0:             e = e.next();
aoqi@0:         }
aoqi@0:         return typeNotFound;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find a member type inherited from a superclass or interface.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param site      The original type from where the selection takes
aoqi@0:      *                   place.
aoqi@0:      *  @param name      The type's name.
aoqi@0:      *  @param c         The class to search for the member type. This is
aoqi@0:      *                   always a superclass or implemented interface of
aoqi@0:      *                   site's class.
aoqi@0:      */
aoqi@0:     Symbol findInheritedMemberType(Env<AttrContext> env,
aoqi@0:                                    Type site,
aoqi@0:                                    Name name,
aoqi@0:                                    TypeSymbol c) {
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         Type st = types.supertype(c.type);
aoqi@0:         if (st != null && st.hasTag(CLASS)) {
aoqi@0:             sym = findMemberType(env, site, name, st.tsym);
aoqi@0:             if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0:         for (List<Type> l = types.interfaces(c.type);
aoqi@0:              bestSoFar.kind != AMBIGUOUS && l.nonEmpty();
aoqi@0:              l = l.tail) {
aoqi@0:             sym = findMemberType(env, site, name, l.head.tsym);
aoqi@0:             if (bestSoFar.kind < AMBIGUOUS && sym.kind < AMBIGUOUS &&
aoqi@0:                 sym.owner != bestSoFar.owner)
aoqi@0:                 bestSoFar = new AmbiguityError(bestSoFar, sym);
aoqi@0:             else if (sym.kind < bestSoFar.kind)
aoqi@0:                 bestSoFar = sym;
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find qualified member type.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param site      The original type from where the selection takes
aoqi@0:      *                   place.
aoqi@0:      *  @param name      The type's name.
aoqi@0:      *  @param c         The class to search for the member type. This is
aoqi@0:      *                   always a superclass or implemented interface of
aoqi@0:      *                   site's class.
aoqi@0:      */
aoqi@0:     Symbol findMemberType(Env<AttrContext> env,
aoqi@0:                           Type site,
aoqi@0:                           Name name,
aoqi@0:                           TypeSymbol c) {
aoqi@0:         Symbol sym = findImmediateMemberType(env, site, name, c);
aoqi@0: 
aoqi@0:         if (sym != typeNotFound)
aoqi@0:             return sym;
aoqi@0: 
aoqi@0:         return findInheritedMemberType(env, site, name, c);
aoqi@0: 
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find a global type in given scope and load corresponding class.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param scope     The scope in which to look for the type.
aoqi@0:      *  @param name      The type's name.
aoqi@0:      */
aoqi@0:     Symbol findGlobalType(Env<AttrContext> env, Scope scope, Name name) {
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         for (Scope.Entry e = scope.lookup(name); e.scope != null; e = e.next()) {
aoqi@0:             Symbol sym = loadClass(env, e.sym.flatName());
aoqi@0:             if (bestSoFar.kind == TYP && sym.kind == TYP &&
aoqi@0:                 bestSoFar != sym)
aoqi@0:                 return new AmbiguityError(bestSoFar, sym);
aoqi@0:             else if (sym.kind < bestSoFar.kind)
aoqi@0:                 bestSoFar = sym;
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol findTypeVar(Env<AttrContext> env, Name name, boolean staticOnly) {
aoqi@0:         for (Scope.Entry e = env.info.scope.lookup(name);
aoqi@0:              e.scope != null;
aoqi@0:              e = e.next()) {
aoqi@0:             if (e.sym.kind == TYP) {
aoqi@0:                 if (staticOnly &&
aoqi@0:                     e.sym.type.hasTag(TYPEVAR) &&
aoqi@0:                     e.sym.owner.kind == TYP)
aoqi@0:                     return new StaticError(e.sym);
aoqi@0:                 return e.sym;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return typeNotFound;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find an unqualified type symbol.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param name      The type's name.
aoqi@0:      */
aoqi@0:     Symbol findType(Env<AttrContext> env, Name name) {
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         boolean staticOnly = false;
aoqi@0:         for (Env<AttrContext> env1 = env; env1.outer != null; env1 = env1.outer) {
aoqi@0:             if (isStatic(env1)) staticOnly = true;
aoqi@0:             // First, look for a type variable and the first member type
aoqi@0:             final Symbol tyvar = findTypeVar(env1, name, staticOnly);
aoqi@0:             sym = findImmediateMemberType(env1, env1.enclClass.sym.type,
aoqi@0:                                           name, env1.enclClass.sym);
aoqi@0: 
aoqi@0:             // Return the type variable if we have it, and have no
aoqi@0:             // immediate member, OR the type variable is for a method.
aoqi@0:             if (tyvar != typeNotFound) {
aoqi@0:                 if (sym == typeNotFound ||
aoqi@0:                     (tyvar.kind == TYP && tyvar.exists() &&
aoqi@0:                      tyvar.owner.kind == MTH))
aoqi@0:                     return tyvar;
aoqi@0:             }
aoqi@0: 
aoqi@0:             // If the environment is a class def, finish up,
aoqi@0:             // otherwise, do the entire findMemberType
aoqi@0:             if (sym == typeNotFound)
aoqi@0:                 sym = findInheritedMemberType(env1, env1.enclClass.sym.type,
aoqi@0:                                               name, env1.enclClass.sym);
aoqi@0: 
aoqi@0:             if (staticOnly && sym.kind == TYP &&
aoqi@0:                 sym.type.hasTag(CLASS) &&
aoqi@0:                 sym.type.getEnclosingType().hasTag(CLASS) &&
aoqi@0:                 env1.enclClass.sym.type.isParameterized() &&
aoqi@0:                 sym.type.getEnclosingType().isParameterized())
aoqi@0:                 return new StaticError(sym);
aoqi@0:             else if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0: 
aoqi@0:             JCClassDecl encl = env1.baseClause ? (JCClassDecl)env1.tree : env1.enclClass;
aoqi@0:             if ((encl.sym.flags() & STATIC) != 0)
aoqi@0:                 staticOnly = true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if (!env.tree.hasTag(IMPORT)) {
aoqi@0:             sym = findGlobalType(env, env.toplevel.namedImportScope, name);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0: 
aoqi@0:             sym = findGlobalType(env, env.toplevel.packge.members(), name);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0: 
aoqi@0:             sym = findGlobalType(env, env.toplevel.starImportScope, name);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find an unqualified identifier which matches a specified kind set.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param kind      Indicates the possible symbol kinds
aoqi@0:      *                   (a subset of VAL, TYP, PCK).
aoqi@0:      */
aoqi@0:     Symbol findIdent(Env<AttrContext> env, Name name, int kind) {
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         Symbol sym;
aoqi@0: 
aoqi@0:         if ((kind & VAR) != 0) {
aoqi@0:             sym = findVar(env, name);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if ((kind & TYP) != 0) {
aoqi@0:             sym = findType(env, name);
aoqi@0:             if (sym.kind==TYP) {
aoqi@0:                  reportDependence(env.enclClass.sym, sym);
aoqi@0:             }
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if ((kind & PCK) != 0) return reader.enterPackage(name);
aoqi@0:         else return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Report dependencies.
aoqi@0:      * @param from The enclosing class sym
aoqi@0:      * @param to   The found identifier that the class depends on.
aoqi@0:      */
aoqi@0:     public void reportDependence(Symbol from, Symbol to) {
aoqi@0:         // Override if you want to collect the reported dependencies.
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find an identifier in a package which matches a specified kind set.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param kind      Indicates the possible symbol kinds
aoqi@0:      *                   (a nonempty subset of TYP, PCK).
aoqi@0:      */
aoqi@0:     Symbol findIdentInPackage(Env<AttrContext> env, TypeSymbol pck,
aoqi@0:                               Name name, int kind) {
aoqi@0:         Name fullname = TypeSymbol.formFullName(name, pck);
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         PackageSymbol pack = null;
aoqi@0:         if ((kind & PCK) != 0) {
aoqi@0:             pack = reader.enterPackage(fullname);
aoqi@0:             if (pack.exists()) return pack;
aoqi@0:         }
aoqi@0:         if ((kind & TYP) != 0) {
aoqi@0:             Symbol sym = loadClass(env, fullname);
aoqi@0:             if (sym.exists()) {
aoqi@0:                 // don't allow programs to use flatnames
aoqi@0:                 if (name == sym.name) return sym;
aoqi@0:             }
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0:         return (pack != null) ? pack : bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find an identifier among the members of a given type `site'.
aoqi@0:      *  @param env       The current environment.
aoqi@0:      *  @param site      The type containing the symbol to be found.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param kind      Indicates the possible symbol kinds
aoqi@0:      *                   (a subset of VAL, TYP).
aoqi@0:      */
aoqi@0:     Symbol findIdentInType(Env<AttrContext> env, Type site,
aoqi@0:                            Name name, int kind) {
aoqi@0:         Symbol bestSoFar = typeNotFound;
aoqi@0:         Symbol sym;
aoqi@0:         if ((kind & VAR) != 0) {
aoqi@0:             sym = findField(env, site, name, site.tsym);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         if ((kind & TYP) != 0) {
aoqi@0:             sym = findMemberType(env, site, name, site.tsym);
aoqi@0:             if (sym.exists()) return sym;
aoqi@0:             else if (sym.kind < bestSoFar.kind) bestSoFar = sym;
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ***************************************************************************
aoqi@0:  *  Access checking
aoqi@0:  *  The following methods convert ResolveErrors to ErrorSymbols, issuing
aoqi@0:  *  an error message in the process
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** If `sym' is a bad symbol: report error and return errSymbol
aoqi@0:      *  else pass through unchanged,
aoqi@0:      *  additional arguments duplicate what has been used in trying to find the
aoqi@0:      *  symbol {@literal (--> flyweight pattern)}. This improves performance since we
aoqi@0:      *  expect misses to happen frequently.
aoqi@0:      *
aoqi@0:      *  @param sym       The symbol that was found, or a ResolveError.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param location  The symbol the served as a context for this lookup
aoqi@0:      *  @param site      The original type from where the selection took place.
aoqi@0:      *  @param name      The symbol's name.
aoqi@0:      *  @param qualified Did we get here through a qualified expression resolution?
aoqi@0:      *  @param argtypes  The invocation's value arguments,
aoqi@0:      *                   if we looked for a method.
aoqi@0:      *  @param typeargtypes  The invocation's type arguments,
aoqi@0:      *                   if we looked for a method.
aoqi@0:      *  @param logResolveHelper helper class used to log resolve errors
aoqi@0:      */
aoqi@0:     Symbol accessInternal(Symbol sym,
aoqi@0:                   DiagnosticPosition pos,
aoqi@0:                   Symbol location,
aoqi@0:                   Type site,
aoqi@0:                   Name name,
aoqi@0:                   boolean qualified,
aoqi@0:                   List<Type> argtypes,
aoqi@0:                   List<Type> typeargtypes,
aoqi@0:                   LogResolveHelper logResolveHelper) {
aoqi@0:         if (sym.kind >= AMBIGUOUS) {
aoqi@0:             ResolveError errSym = (ResolveError)sym.baseSymbol();
aoqi@0:             sym = errSym.access(name, qualified ? site.tsym : syms.noSymbol);
aoqi@0:             argtypes = logResolveHelper.getArgumentTypes(errSym, sym, name, argtypes);
aoqi@0:             if (logResolveHelper.resolveDiagnosticNeeded(site, argtypes, typeargtypes)) {
aoqi@0:                 logResolveError(errSym, pos, location, site, name, argtypes, typeargtypes);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return sym;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Variant of the generalized access routine, to be used for generating method
aoqi@0:      * resolution diagnostics
aoqi@0:      */
aoqi@0:     Symbol accessMethod(Symbol sym,
aoqi@0:                   DiagnosticPosition pos,
aoqi@0:                   Symbol location,
aoqi@0:                   Type site,
aoqi@0:                   Name name,
aoqi@0:                   boolean qualified,
aoqi@0:                   List<Type> argtypes,
aoqi@0:                   List<Type> typeargtypes) {
aoqi@0:         return accessInternal(sym, pos, location, site, name, qualified, argtypes, typeargtypes, methodLogResolveHelper);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Same as original accessMethod(), but without location.
aoqi@0:      */
aoqi@0:     Symbol accessMethod(Symbol sym,
aoqi@0:                   DiagnosticPosition pos,
aoqi@0:                   Type site,
aoqi@0:                   Name name,
aoqi@0:                   boolean qualified,
aoqi@0:                   List<Type> argtypes,
aoqi@0:                   List<Type> typeargtypes) {
aoqi@0:         return accessMethod(sym, pos, site.tsym, site, name, qualified, argtypes, typeargtypes);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Variant of the generalized access routine, to be used for generating variable,
aoqi@0:      * type resolution diagnostics
aoqi@0:      */
aoqi@0:     Symbol accessBase(Symbol sym,
aoqi@0:                   DiagnosticPosition pos,
aoqi@0:                   Symbol location,
aoqi@0:                   Type site,
aoqi@0:                   Name name,
aoqi@0:                   boolean qualified) {
aoqi@0:         return accessInternal(sym, pos, location, site, name, qualified, List.<Type>nil(), null, basicLogResolveHelper);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Same as original accessBase(), but without location.
aoqi@0:      */
aoqi@0:     Symbol accessBase(Symbol sym,
aoqi@0:                   DiagnosticPosition pos,
aoqi@0:                   Type site,
aoqi@0:                   Name name,
aoqi@0:                   boolean qualified) {
aoqi@0:         return accessBase(sym, pos, site.tsym, site, name, qualified);
aoqi@0:     }
aoqi@0: 
aoqi@0:     interface LogResolveHelper {
aoqi@0:         boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes);
aoqi@0:         List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes);
aoqi@0:     }
aoqi@0: 
aoqi@0:     LogResolveHelper basicLogResolveHelper = new LogResolveHelper() {
aoqi@0:         public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:             return !site.isErroneous();
aoqi@0:         }
aoqi@0:         public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
aoqi@0:             return argtypes;
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     LogResolveHelper methodLogResolveHelper = new LogResolveHelper() {
aoqi@0:         public boolean resolveDiagnosticNeeded(Type site, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:             return !site.isErroneous() &&
aoqi@0:                         !Type.isErroneous(argtypes) &&
aoqi@0:                         (typeargtypes == null || !Type.isErroneous(typeargtypes));
aoqi@0:         }
aoqi@0:         public List<Type> getArgumentTypes(ResolveError errSym, Symbol accessedSym, Name name, List<Type> argtypes) {
aoqi@0:             return (syms.operatorNames.contains(name)) ?
aoqi@0:                     argtypes :
aoqi@0:                     Type.map(argtypes, new ResolveDeferredRecoveryMap(AttrMode.SPECULATIVE, accessedSym, currentResolutionContext.step));
aoqi@0:         }
aoqi@0:     };
aoqi@0: 
aoqi@0:     class ResolveDeferredRecoveryMap extends DeferredAttr.RecoveryDeferredTypeMap {
aoqi@0: 
aoqi@0:         public ResolveDeferredRecoveryMap(AttrMode mode, Symbol msym, MethodResolutionPhase step) {
aoqi@0:             deferredAttr.super(mode, msym, step);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Type typeOf(DeferredType dt) {
aoqi@0:             Type res = super.typeOf(dt);
aoqi@0:             if (!res.isErroneous()) {
aoqi@0:                 switch (TreeInfo.skipParens(dt.tree).getTag()) {
aoqi@0:                     case LAMBDA:
aoqi@0:                     case REFERENCE:
aoqi@0:                         return dt;
aoqi@0:                     case CONDEXPR:
aoqi@0:                         return res == Type.recoveryType ?
aoqi@0:                                 dt : res;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             return res;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Check that sym is not an abstract method.
aoqi@0:      */
aoqi@0:     void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
aoqi@0:         if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
aoqi@0:             log.error(pos, "abstract.cant.be.accessed.directly",
aoqi@0:                       kindName(sym), sym, sym.location());
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ***************************************************************************
aoqi@0:  *  Debugging
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** print all scopes starting with scope s and proceeding outwards.
aoqi@0:      *  used for debugging.
aoqi@0:      */
aoqi@0:     public void printscopes(Scope s) {
aoqi@0:         while (s != null) {
aoqi@0:             if (s.owner != null)
aoqi@0:                 System.err.print(s.owner + ": ");
aoqi@0:             for (Scope.Entry e = s.elems; e != null; e = e.sibling) {
aoqi@0:                 if ((e.sym.flags() & ABSTRACT) != 0)
aoqi@0:                     System.err.print("abstract ");
aoqi@0:                 System.err.print(e.sym + " ");
aoqi@0:             }
aoqi@0:             System.err.println();
aoqi@0:             s = s.next;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     void printscopes(Env<AttrContext> env) {
aoqi@0:         while (env.outer != null) {
aoqi@0:             System.err.println("------------------------------");
aoqi@0:             printscopes(env.info.scope);
aoqi@0:             env = env.outer;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public void printscopes(Type t) {
aoqi@0:         while (t.hasTag(CLASS)) {
aoqi@0:             printscopes(t.tsym.members());
aoqi@0:             t = types.supertype(t);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ***************************************************************************
aoqi@0:  *  Name resolution
aoqi@0:  *  Naming conventions are as for symbol lookup
aoqi@0:  *  Unlike the find... methods these methods will report access errors
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     /** Resolve an unqualified (non-method) identifier.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the identifier use.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param kind      The set of admissible symbol kinds for the identifier.
aoqi@0:      */
aoqi@0:     Symbol resolveIdent(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                         Name name, int kind) {
aoqi@0:         return accessBase(
aoqi@0:             findIdent(env, name, kind),
aoqi@0:             pos, env.enclClass.sym.type, name, false);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve an unqualified method identifier.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the method invocation.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param argtypes  The types of the invocation's value arguments.
aoqi@0:      *  @param typeargtypes  The types of the invocation's type arguments.
aoqi@0:      */
aoqi@0:     Symbol resolveMethod(DiagnosticPosition pos,
aoqi@0:                          Env<AttrContext> env,
aoqi@0:                          Name name,
aoqi@0:                          List<Type> argtypes,
aoqi@0:                          List<Type> typeargtypes) {
aoqi@0:         return lookupMethod(env, pos, env.enclClass.sym, resolveMethodCheck,
aoqi@0:                 new BasicLookupHelper(name, env.enclClass.sym.type, argtypes, typeargtypes) {
aoqi@0:                     @Override
aoqi@0:                     Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                         return findFun(env, name, argtypes, typeargtypes,
aoqi@0:                                 phase.isBoxingRequired(),
aoqi@0:                                 phase.isVarargsRequired());
aoqi@0:                     }});
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve a qualified method identifier
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the method invocation.
aoqi@0:      *  @param site      The type of the qualifying expression, in which
aoqi@0:      *                   identifier is searched.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param argtypes  The types of the invocation's value arguments.
aoqi@0:      *  @param typeargtypes  The types of the invocation's type arguments.
aoqi@0:      */
aoqi@0:     Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                   Type site, Name name, List<Type> argtypes,
aoqi@0:                                   List<Type> typeargtypes) {
aoqi@0:         return resolveQualifiedMethod(pos, env, site.tsym, site, name, argtypes, typeargtypes);
aoqi@0:     }
aoqi@0:     Symbol resolveQualifiedMethod(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                   Symbol location, Type site, Name name, List<Type> argtypes,
aoqi@0:                                   List<Type> typeargtypes) {
aoqi@0:         return resolveQualifiedMethod(new MethodResolutionContext(), pos, env, location, site, name, argtypes, typeargtypes);
aoqi@0:     }
aoqi@0:     private Symbol resolveQualifiedMethod(MethodResolutionContext resolveContext,
aoqi@0:                                   DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                   Symbol location, Type site, Name name, List<Type> argtypes,
aoqi@0:                                   List<Type> typeargtypes) {
aoqi@0:         return lookupMethod(env, pos, location, resolveContext, new BasicLookupHelper(name, site, argtypes, typeargtypes) {
aoqi@0:             @Override
aoqi@0:             Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                 return findMethod(env, site, name, argtypes, typeargtypes,
aoqi@0:                         phase.isBoxingRequired(),
aoqi@0:                         phase.isVarargsRequired(), false);
aoqi@0:             }
aoqi@0:             @Override
aoqi@0:             Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
aoqi@0:                 if (sym.kind >= AMBIGUOUS) {
aoqi@0:                     sym = super.access(env, pos, location, sym);
aoqi@0:                 } else if (allowMethodHandles) {
aoqi@0:                     MethodSymbol msym = (MethodSymbol)sym;
aoqi@0:                     if ((msym.flags() & SIGNATURE_POLYMORPHIC) != 0) {
aoqi@0:                         return findPolymorphicSignatureInstance(env, sym, argtypes);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 return sym;
aoqi@0:             }
aoqi@0:         });
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Find or create an implicit method of exactly the given type (after erasure).
aoqi@0:      *  Searches in a side table, not the main scope of the site.
aoqi@0:      *  This emulates the lookup process required by JSR 292 in JVM.
aoqi@0:      *  @param env       Attribution environment
aoqi@0:      *  @param spMethod  signature polymorphic method - i.e. MH.invokeExact
aoqi@0:      *  @param argtypes  The required argument types
aoqi@0:      */
aoqi@0:     Symbol findPolymorphicSignatureInstance(Env<AttrContext> env,
aoqi@0:                                             final Symbol spMethod,
aoqi@0:                                             List<Type> argtypes) {
aoqi@0:         Type mtype = infer.instantiatePolymorphicSignatureInstance(env,
aoqi@0:                 (MethodSymbol)spMethod, currentResolutionContext, argtypes);
aoqi@0:         for (Symbol sym : polymorphicSignatureScope.getElementsByName(spMethod.name)) {
aoqi@0:             if (types.isSameType(mtype, sym.type)) {
aoqi@0:                return sym;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         // create the desired method
aoqi@0:         long flags = ABSTRACT | HYPOTHETICAL | spMethod.flags() & Flags.AccessFlags;
aoqi@0:         Symbol msym = new MethodSymbol(flags, spMethod.name, mtype, spMethod.owner) {
aoqi@0:             @Override
aoqi@0:             public Symbol baseSymbol() {
aoqi@0:                 return spMethod;
aoqi@0:             }
aoqi@0:         };
mcimadamore@3075:         if (!mtype.isErroneous()) { // Cache only if kosher.
mcimadamore@3075:             polymorphicSignatureScope.enter(msym);
mcimadamore@3075:         }
aoqi@0:         return msym;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve a qualified method identifier, throw a fatal error if not
aoqi@0:      *  found.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the method invocation.
aoqi@0:      *  @param site      The type of the qualifying expression, in which
aoqi@0:      *                   identifier is searched.
aoqi@0:      *  @param name      The identifier's name.
aoqi@0:      *  @param argtypes  The types of the invocation's value arguments.
aoqi@0:      *  @param typeargtypes  The types of the invocation's type arguments.
aoqi@0:      */
aoqi@0:     public MethodSymbol resolveInternalMethod(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                         Type site, Name name,
aoqi@0:                                         List<Type> argtypes,
aoqi@0:                                         List<Type> typeargtypes) {
aoqi@0:         MethodResolutionContext resolveContext = new MethodResolutionContext();
aoqi@0:         resolveContext.internalResolution = true;
aoqi@0:         Symbol sym = resolveQualifiedMethod(resolveContext, pos, env, site.tsym,
aoqi@0:                 site, name, argtypes, typeargtypes);
aoqi@0:         if (sym.kind == MTH) return (MethodSymbol)sym;
aoqi@0:         else throw new FatalError(
aoqi@0:                  diags.fragment("fatal.err.cant.locate.meth",
aoqi@0:                                 name));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve constructor.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the constructor invocation.
aoqi@0:      *  @param site      The type of class for which a constructor is searched.
aoqi@0:      *  @param argtypes  The types of the constructor invocation's value
aoqi@0:      *                   arguments.
aoqi@0:      *  @param typeargtypes  The types of the constructor invocation's type
aoqi@0:      *                   arguments.
aoqi@0:      */
aoqi@0:     Symbol resolveConstructor(DiagnosticPosition pos,
aoqi@0:                               Env<AttrContext> env,
aoqi@0:                               Type site,
aoqi@0:                               List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes) {
aoqi@0:         return resolveConstructor(new MethodResolutionContext(), pos, env, site, argtypes, typeargtypes);
aoqi@0:     }
aoqi@0: 
aoqi@0:     private Symbol resolveConstructor(MethodResolutionContext resolveContext,
aoqi@0:                               final DiagnosticPosition pos,
aoqi@0:                               Env<AttrContext> env,
aoqi@0:                               Type site,
aoqi@0:                               List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes) {
aoqi@0:         return lookupMethod(env, pos, site.tsym, resolveContext, new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
aoqi@0:             @Override
aoqi@0:             Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                 return findConstructor(pos, env, site, argtypes, typeargtypes,
aoqi@0:                         phase.isBoxingRequired(),
aoqi@0:                         phase.isVarargsRequired());
aoqi@0:             }
aoqi@0:         });
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve a constructor, throw a fatal error if not found.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the method invocation.
aoqi@0:      *  @param site      The type to be constructed.
aoqi@0:      *  @param argtypes  The types of the invocation's value arguments.
aoqi@0:      *  @param typeargtypes  The types of the invocation's type arguments.
aoqi@0:      */
aoqi@0:     public MethodSymbol resolveInternalConstructor(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                                         Type site,
aoqi@0:                                         List<Type> argtypes,
aoqi@0:                                         List<Type> typeargtypes) {
aoqi@0:         MethodResolutionContext resolveContext = new MethodResolutionContext();
aoqi@0:         resolveContext.internalResolution = true;
aoqi@0:         Symbol sym = resolveConstructor(resolveContext, pos, env, site, argtypes, typeargtypes);
aoqi@0:         if (sym.kind == MTH) return (MethodSymbol)sym;
aoqi@0:         else throw new FatalError(
aoqi@0:                  diags.fragment("fatal.err.cant.locate.ctor", site));
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol findConstructor(DiagnosticPosition pos, Env<AttrContext> env,
aoqi@0:                               Type site, List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes,
aoqi@0:                               boolean allowBoxing,
aoqi@0:                               boolean useVarargs) {
aoqi@0:         Symbol sym = findMethod(env, site,
aoqi@0:                                     names.init, argtypes,
aoqi@0:                                     typeargtypes, allowBoxing,
aoqi@0:                                     useVarargs, false);
aoqi@0:         chk.checkDeprecated(pos, env.info.scope.owner, sym);
aoqi@0:         return sym;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve constructor using diamond inference.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param env       The environment current at the constructor invocation.
aoqi@0:      *  @param site      The type of class for which a constructor is searched.
aoqi@0:      *                   The scope of this class has been touched in attribution.
aoqi@0:      *  @param argtypes  The types of the constructor invocation's value
aoqi@0:      *                   arguments.
aoqi@0:      *  @param typeargtypes  The types of the constructor invocation's type
aoqi@0:      *                   arguments.
aoqi@0:      */
aoqi@0:     Symbol resolveDiamond(DiagnosticPosition pos,
aoqi@0:                               Env<AttrContext> env,
aoqi@0:                               Type site,
aoqi@0:                               List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes) {
aoqi@0:         return lookupMethod(env, pos, site.tsym, resolveMethodCheck,
aoqi@0:                 new BasicLookupHelper(names.init, site, argtypes, typeargtypes) {
aoqi@0:                     @Override
aoqi@0:                     Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                         return findDiamond(env, site, argtypes, typeargtypes,
aoqi@0:                                 phase.isBoxingRequired(),
aoqi@0:                                 phase.isVarargsRequired());
aoqi@0:                     }
aoqi@0:                     @Override
aoqi@0:                     Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
aoqi@0:                         if (sym.kind >= AMBIGUOUS) {
aoqi@0:                             if (sym.kind != WRONG_MTH && sym.kind != WRONG_MTHS) {
aoqi@0:                                 sym = super.access(env, pos, location, sym);
aoqi@0:                             } else {
aoqi@0:                                 final JCDiagnostic details = sym.kind == WRONG_MTH ?
aoqi@0:                                                 ((InapplicableSymbolError)sym.baseSymbol()).errCandidate().snd :
aoqi@0:                                                 null;
aoqi@0:                                 sym = new InapplicableSymbolError(sym.kind, "diamondError", currentResolutionContext) {
aoqi@0:                                     @Override
aoqi@0:                                     JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos,
aoqi@0:                                             Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:                                         String key = details == null ?
aoqi@0:                                             "cant.apply.diamond" :
aoqi@0:                                             "cant.apply.diamond.1";
aoqi@0:                                         return diags.create(dkind, log.currentSource(), pos, key,
aoqi@0:                                                 diags.fragment("diamond", site.tsym), details);
aoqi@0:                                     }
aoqi@0:                                 };
aoqi@0:                                 sym = accessMethod(sym, pos, site, names.init, true, argtypes, typeargtypes);
aoqi@0:                                 env.info.pendingResolutionPhase = currentResolutionContext.step;
aoqi@0:                             }
aoqi@0:                         }
aoqi@0:                         return sym;
aoqi@0:                     }});
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** This method scans all the constructor symbol in a given class scope -
aoqi@0:      *  assuming that the original scope contains a constructor of the kind:
aoqi@0:      *  {@code Foo(X x, Y y)}, where X,Y are class type-variables declared in Foo,
aoqi@0:      *  a method check is executed against the modified constructor type:
aoqi@0:      *  {@code <X,Y>Foo<X,Y>(X x, Y y)}. This is crucial in order to enable diamond
aoqi@0:      *  inference. The inferred return type of the synthetic constructor IS
aoqi@0:      *  the inferred type for the diamond operator.
aoqi@0:      */
aoqi@0:     private Symbol findDiamond(Env<AttrContext> env,
aoqi@0:                               Type site,
aoqi@0:                               List<Type> argtypes,
aoqi@0:                               List<Type> typeargtypes,
aoqi@0:                               boolean allowBoxing,
aoqi@0:                               boolean useVarargs) {
aoqi@0:         Symbol bestSoFar = methodNotFound;
aoqi@0:         for (Scope.Entry e = site.tsym.members().lookup(names.init);
aoqi@0:              e.scope != null;
aoqi@0:              e = e.next()) {
aoqi@0:             final Symbol sym = e.sym;
aoqi@0:             //- System.out.println(" e " + e.sym);
aoqi@0:             if (sym.kind == MTH &&
aoqi@0:                 (sym.flags_field & SYNTHETIC) == 0) {
aoqi@0:                     List<Type> oldParams = e.sym.type.hasTag(FORALL) ?
aoqi@0:                             ((ForAll)sym.type).tvars :
aoqi@0:                             List.<Type>nil();
aoqi@0:                     Type constrType = new ForAll(site.tsym.type.getTypeArguments().appendList(oldParams),
aoqi@0:                             types.createMethodTypeWithReturn(sym.type.asMethodType(), site));
aoqi@0:                     MethodSymbol newConstr = new MethodSymbol(sym.flags(), names.init, constrType, site.tsym) {
aoqi@0:                         @Override
aoqi@0:                         public Symbol baseSymbol() {
aoqi@0:                             return sym;
aoqi@0:                         }
aoqi@0:                     };
aoqi@0:                     bestSoFar = selectBest(env, site, argtypes, typeargtypes,
aoqi@0:                             newConstr,
aoqi@0:                             bestSoFar,
aoqi@0:                             allowBoxing,
aoqi@0:                             useVarargs,
aoqi@0:                             false);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return bestSoFar;
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0: 
aoqi@0:     /** Resolve operator.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param optag     The tag of the operation tree.
aoqi@0:      *  @param env       The environment current at the operation.
aoqi@0:      *  @param argtypes  The types of the operands.
aoqi@0:      */
aoqi@0:     Symbol resolveOperator(DiagnosticPosition pos, JCTree.Tag optag,
aoqi@0:                            Env<AttrContext> env, List<Type> argtypes) {
aoqi@0:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
aoqi@0:         try {
aoqi@0:             currentResolutionContext = new MethodResolutionContext();
aoqi@0:             Name name = treeinfo.operatorName(optag);
aoqi@0:             return lookupMethod(env, pos, syms.predefClass, currentResolutionContext,
aoqi@0:                     new BasicLookupHelper(name, syms.predefClass.type, argtypes, null, BOX) {
aoqi@0:                 @Override
aoqi@0:                 Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                     return findMethod(env, site, name, argtypes, typeargtypes,
aoqi@0:                             phase.isBoxingRequired(),
aoqi@0:                             phase.isVarargsRequired(), true);
aoqi@0:                 }
aoqi@0:                 @Override
aoqi@0:                 Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
aoqi@0:                     return accessMethod(sym, pos, env.enclClass.sym.type, name,
aoqi@0:                           false, argtypes, null);
aoqi@0:                 }
aoqi@0:             });
aoqi@0:         } finally {
aoqi@0:             currentResolutionContext = prevResolutionContext;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve operator.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param optag     The tag of the operation tree.
aoqi@0:      *  @param env       The environment current at the operation.
aoqi@0:      *  @param arg       The type of the operand.
aoqi@0:      */
aoqi@0:     Symbol resolveUnaryOperator(DiagnosticPosition pos, JCTree.Tag optag, Env<AttrContext> env, Type arg) {
aoqi@0:         return resolveOperator(pos, optag, env, List.of(arg));
aoqi@0:     }
aoqi@0: 
aoqi@0:     /** Resolve binary operator.
aoqi@0:      *  @param pos       The position to use for error reporting.
aoqi@0:      *  @param optag     The tag of the operation tree.
aoqi@0:      *  @param env       The environment current at the operation.
aoqi@0:      *  @param left      The types of the left operand.
aoqi@0:      *  @param right     The types of the right operand.
aoqi@0:      */
aoqi@0:     Symbol resolveBinaryOperator(DiagnosticPosition pos,
aoqi@0:                                  JCTree.Tag optag,
aoqi@0:                                  Env<AttrContext> env,
aoqi@0:                                  Type left,
aoqi@0:                                  Type right) {
aoqi@0:         return resolveOperator(pos, optag, env, List.of(left, right));
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol getMemberReference(DiagnosticPosition pos,
aoqi@0:             Env<AttrContext> env,
aoqi@0:             JCMemberReference referenceTree,
aoqi@0:             Type site,
aoqi@0:             Name name) {
aoqi@0: 
aoqi@0:         site = types.capture(site);
aoqi@0: 
aoqi@0:         ReferenceLookupHelper lookupHelper = makeReferenceLookupHelper(
aoqi@0:                 referenceTree, site, name, List.<Type>nil(), null, VARARITY);
aoqi@0: 
aoqi@0:         Env<AttrContext> newEnv = env.dup(env.tree, env.info.dup());
aoqi@0:         Symbol sym = lookupMethod(newEnv, env.tree.pos(), site.tsym,
aoqi@0:                 nilMethodCheck, lookupHelper);
aoqi@0: 
aoqi@0:         env.info.pendingResolutionPhase = newEnv.info.pendingResolutionPhase;
aoqi@0: 
aoqi@0:         return sym;
aoqi@0:     }
aoqi@0: 
aoqi@0:     ReferenceLookupHelper makeReferenceLookupHelper(JCMemberReference referenceTree,
aoqi@0:                                   Type site,
aoqi@0:                                   Name name,
aoqi@0:                                   List<Type> argtypes,
aoqi@0:                                   List<Type> typeargtypes,
aoqi@0:                                   MethodResolutionPhase maxPhase) {
aoqi@0:         ReferenceLookupHelper result;
aoqi@0:         if (!name.equals(names.init)) {
aoqi@0:             //method reference
aoqi@0:             result =
aoqi@0:                     new MethodReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
aoqi@0:         } else {
aoqi@0:             if (site.hasTag(ARRAY)) {
aoqi@0:                 //array constructor reference
aoqi@0:                 result =
aoqi@0:                         new ArrayConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
aoqi@0:             } else {
aoqi@0:                 //class constructor reference
aoqi@0:                 result =
aoqi@0:                         new ConstructorReferenceLookupHelper(referenceTree, site, argtypes, typeargtypes, maxPhase);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return result;
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol resolveMemberReferenceByArity(Env<AttrContext> env,
aoqi@0:                                   JCMemberReference referenceTree,
aoqi@0:                                   Type site,
aoqi@0:                                   Name name,
aoqi@0:                                   List<Type> argtypes,
aoqi@0:                                   InferenceContext inferenceContext) {
aoqi@0: 
aoqi@0:         boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
aoqi@0:         site = types.capture(site);
aoqi@0: 
aoqi@0:         ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
aoqi@0:                 referenceTree, site, name, argtypes, null, VARARITY);
aoqi@0:         //step 1 - bound lookup
aoqi@0:         Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
aoqi@0:         Symbol boundSym = lookupMethod(boundEnv, env.tree.pos(), site.tsym,
aoqi@0:                 arityMethodCheck, boundLookupHelper);
aoqi@0:         if (isStaticSelector &&
aoqi@0:             !name.equals(names.init) &&
aoqi@0:             !boundSym.isStatic() &&
aoqi@0:             boundSym.kind < ERRONEOUS) {
aoqi@0:             boundSym = methodNotFound;
aoqi@0:         }
aoqi@0: 
aoqi@0:         //step 2 - unbound lookup
aoqi@0:         Symbol unboundSym = methodNotFound;
aoqi@0:         ReferenceLookupHelper unboundLookupHelper = null;
aoqi@0:         Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
aoqi@0:         if (isStaticSelector) {
aoqi@0:             unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
aoqi@0:             unboundSym = lookupMethod(unboundEnv, env.tree.pos(), site.tsym,
aoqi@0:                     arityMethodCheck, unboundLookupHelper);
aoqi@0:             if (unboundSym.isStatic() &&
aoqi@0:                 unboundSym.kind < ERRONEOUS) {
aoqi@0:                 unboundSym = methodNotFound;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         //merge results
aoqi@0:         Symbol bestSym = choose(boundSym, unboundSym);
aoqi@0:         env.info.pendingResolutionPhase = bestSym == unboundSym ?
aoqi@0:                 unboundEnv.info.pendingResolutionPhase :
aoqi@0:                 boundEnv.info.pendingResolutionPhase;
aoqi@0: 
aoqi@0:         return bestSym;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Resolution of member references is typically done as a single
aoqi@0:      * overload resolution step, where the argument types A are inferred from
aoqi@0:      * the target functional descriptor.
aoqi@0:      *
aoqi@0:      * If the member reference is a method reference with a type qualifier,
aoqi@0:      * a two-step lookup process is performed. The first step uses the
aoqi@0:      * expected argument list A, while the second step discards the first
aoqi@0:      * type from A (which is treated as a receiver type).
aoqi@0:      *
aoqi@0:      * There are two cases in which inference is performed: (i) if the member
aoqi@0:      * reference is a constructor reference and the qualifier type is raw - in
aoqi@0:      * which case diamond inference is used to infer a parameterization for the
aoqi@0:      * type qualifier; (ii) if the member reference is an unbound reference
aoqi@0:      * where the type qualifier is raw - in that case, during the unbound lookup
aoqi@0:      * the receiver argument type is used to infer an instantiation for the raw
aoqi@0:      * qualifier type.
aoqi@0:      *
aoqi@0:      * When a multi-step resolution process is exploited, it is an error
aoqi@0:      * if two candidates are found (ambiguity).
aoqi@0:      *
aoqi@0:      * This routine returns a pair (T,S), where S is the member reference symbol,
aoqi@0:      * and T is the type of the class in which S is defined. This is necessary as
aoqi@0:      * the type T might be dynamically inferred (i.e. if constructor reference
aoqi@0:      * has a raw qualifier).
aoqi@0:      */
aoqi@0:     Pair<Symbol, ReferenceLookupHelper> resolveMemberReference(Env<AttrContext> env,
aoqi@0:                                   JCMemberReference referenceTree,
aoqi@0:                                   Type site,
aoqi@0:                                   Name name,
aoqi@0:                                   List<Type> argtypes,
aoqi@0:                                   List<Type> typeargtypes,
aoqi@0:                                   MethodCheck methodCheck,
aoqi@0:                                   InferenceContext inferenceContext,
aoqi@0:                                   AttrMode mode) {
aoqi@0: 
aoqi@0:         site = types.capture(site);
aoqi@0:         ReferenceLookupHelper boundLookupHelper = makeReferenceLookupHelper(
aoqi@0:                 referenceTree, site, name, argtypes, typeargtypes, VARARITY);
aoqi@0: 
aoqi@0:         //step 1 - bound lookup
aoqi@0:         Env<AttrContext> boundEnv = env.dup(env.tree, env.info.dup());
aoqi@0:         Symbol origBoundSym;
aoqi@0:         boolean staticErrorForBound = false;
aoqi@0:         MethodResolutionContext boundSearchResolveContext = new MethodResolutionContext();
aoqi@0:         boundSearchResolveContext.methodCheck = methodCheck;
aoqi@0:         Symbol boundSym = origBoundSym = lookupMethod(boundEnv, env.tree.pos(),
aoqi@0:                 site.tsym, boundSearchResolveContext, boundLookupHelper);
aoqi@0:         SearchResultKind boundSearchResultKind = SearchResultKind.NOT_APPLICABLE_MATCH;
aoqi@0:         boolean isStaticSelector = TreeInfo.isStaticSelector(referenceTree.expr, names);
aoqi@0:         boolean shouldCheckForStaticness = isStaticSelector &&
aoqi@0:                 referenceTree.getMode() == ReferenceMode.INVOKE;
aoqi@0:         if (boundSym.kind != WRONG_MTHS && boundSym.kind != WRONG_MTH) {
aoqi@0:             if (shouldCheckForStaticness) {
aoqi@0:                 if (!boundSym.isStatic()) {
aoqi@0:                     staticErrorForBound = true;
aoqi@0:                     if (hasAnotherApplicableMethod(
aoqi@0:                             boundSearchResolveContext, boundSym, true)) {
aoqi@0:                         boundSearchResultKind = SearchResultKind.BAD_MATCH_MORE_SPECIFIC;
aoqi@0:                     } else {
aoqi@0:                         boundSearchResultKind = SearchResultKind.BAD_MATCH;
aoqi@0:                         if (boundSym.kind < ERRONEOUS) {
aoqi@0:                             boundSym = methodWithCorrectStaticnessNotFound;
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 } else if (boundSym.kind < ERRONEOUS) {
aoqi@0:                     boundSearchResultKind = SearchResultKind.GOOD_MATCH;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         //step 2 - unbound lookup
aoqi@0:         Symbol origUnboundSym = null;
aoqi@0:         Symbol unboundSym = methodNotFound;
aoqi@0:         ReferenceLookupHelper unboundLookupHelper = null;
aoqi@0:         Env<AttrContext> unboundEnv = env.dup(env.tree, env.info.dup());
aoqi@0:         SearchResultKind unboundSearchResultKind = SearchResultKind.NOT_APPLICABLE_MATCH;
aoqi@0:         boolean staticErrorForUnbound = false;
aoqi@0:         if (isStaticSelector) {
aoqi@0:             unboundLookupHelper = boundLookupHelper.unboundLookup(inferenceContext);
aoqi@0:             MethodResolutionContext unboundSearchResolveContext =
aoqi@0:                     new MethodResolutionContext();
aoqi@0:             unboundSearchResolveContext.methodCheck = methodCheck;
aoqi@0:             unboundSym = origUnboundSym = lookupMethod(unboundEnv, env.tree.pos(),
aoqi@0:                     site.tsym, unboundSearchResolveContext, unboundLookupHelper);
aoqi@0: 
aoqi@0:             if (unboundSym.kind != WRONG_MTH && unboundSym.kind != WRONG_MTHS) {
aoqi@0:                 if (shouldCheckForStaticness) {
aoqi@0:                     if (unboundSym.isStatic()) {
aoqi@0:                         staticErrorForUnbound = true;
aoqi@0:                         if (hasAnotherApplicableMethod(
aoqi@0:                                 unboundSearchResolveContext, unboundSym, false)) {
aoqi@0:                             unboundSearchResultKind = SearchResultKind.BAD_MATCH_MORE_SPECIFIC;
aoqi@0:                         } else {
aoqi@0:                             unboundSearchResultKind = SearchResultKind.BAD_MATCH;
aoqi@0:                             if (unboundSym.kind < ERRONEOUS) {
aoqi@0:                                 unboundSym = methodWithCorrectStaticnessNotFound;
aoqi@0:                             }
aoqi@0:                         }
aoqi@0:                     } else if (unboundSym.kind < ERRONEOUS) {
aoqi@0:                         unboundSearchResultKind = SearchResultKind.GOOD_MATCH;
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         //merge results
aoqi@0:         Pair<Symbol, ReferenceLookupHelper> res;
aoqi@0:         Symbol bestSym = choose(boundSym, unboundSym);
aoqi@0:         if (bestSym.kind < ERRONEOUS && (staticErrorForBound || staticErrorForUnbound)) {
aoqi@0:             if (staticErrorForBound) {
aoqi@0:                 boundSym = methodWithCorrectStaticnessNotFound;
aoqi@0:             }
aoqi@0:             if (staticErrorForUnbound) {
aoqi@0:                 unboundSym = methodWithCorrectStaticnessNotFound;
aoqi@0:             }
aoqi@0:             bestSym = choose(boundSym, unboundSym);
aoqi@0:         }
aoqi@0:         if (bestSym == methodWithCorrectStaticnessNotFound && mode == AttrMode.CHECK) {
aoqi@0:             Symbol symToPrint = origBoundSym;
aoqi@0:             String errorFragmentToPrint = "non-static.cant.be.ref";
aoqi@0:             if (staticErrorForBound && staticErrorForUnbound) {
aoqi@0:                 if (unboundSearchResultKind == SearchResultKind.BAD_MATCH_MORE_SPECIFIC) {
aoqi@0:                     symToPrint = origUnboundSym;
aoqi@0:                     errorFragmentToPrint = "static.method.in.unbound.lookup";
aoqi@0:                 }
aoqi@0:             } else {
aoqi@0:                 if (!staticErrorForBound) {
aoqi@0:                     symToPrint = origUnboundSym;
aoqi@0:                     errorFragmentToPrint = "static.method.in.unbound.lookup";
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             log.error(referenceTree.expr.pos(), "invalid.mref",
aoqi@0:                 Kinds.kindName(referenceTree.getMode()),
aoqi@0:                 diags.fragment(errorFragmentToPrint,
aoqi@0:                 Kinds.kindName(symToPrint), symToPrint));
aoqi@0:         }
aoqi@0:         res = new Pair<>(bestSym,
aoqi@0:                 bestSym == unboundSym ? unboundLookupHelper : boundLookupHelper);
aoqi@0:         env.info.pendingResolutionPhase = bestSym == unboundSym ?
aoqi@0:                 unboundEnv.info.pendingResolutionPhase :
aoqi@0:                 boundEnv.info.pendingResolutionPhase;
aoqi@0: 
aoqi@0:         return res;
aoqi@0:     }
aoqi@0: 
aoqi@0:     enum SearchResultKind {
aoqi@0:         GOOD_MATCH,                 //type I
aoqi@0:         BAD_MATCH_MORE_SPECIFIC,    //type II
aoqi@0:         BAD_MATCH,                  //type III
aoqi@0:         NOT_APPLICABLE_MATCH        //type IV
aoqi@0:     }
aoqi@0: 
aoqi@0:     boolean hasAnotherApplicableMethod(MethodResolutionContext resolutionContext,
aoqi@0:             Symbol bestSoFar, boolean staticMth) {
aoqi@0:         for (Candidate c : resolutionContext.candidates) {
aoqi@0:             if (resolutionContext.step != c.step ||
aoqi@0:                 !c.isApplicable() ||
aoqi@0:                 c.sym == bestSoFar) {
aoqi@0:                 continue;
aoqi@0:             } else {
aoqi@0:                 if (c.sym.isStatic() == staticMth) {
aoqi@0:                     return true;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return false;
aoqi@0:     }
aoqi@0: 
aoqi@0:     //where
aoqi@0:         private Symbol choose(Symbol boundSym, Symbol unboundSym) {
aoqi@0:             if (lookupSuccess(boundSym) && lookupSuccess(unboundSym)) {
aoqi@0:                 return ambiguityError(boundSym, unboundSym);
aoqi@0:             } else if (lookupSuccess(boundSym) ||
aoqi@0:                     (canIgnore(unboundSym) && !canIgnore(boundSym))) {
aoqi@0:                 return boundSym;
aoqi@0:             } else if (lookupSuccess(unboundSym) ||
aoqi@0:                     (canIgnore(boundSym) && !canIgnore(unboundSym))) {
aoqi@0:                 return unboundSym;
aoqi@0:             } else {
aoqi@0:                 return boundSym;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         private boolean lookupSuccess(Symbol s) {
aoqi@0:             return s.kind == MTH || s.kind == AMBIGUOUS;
aoqi@0:         }
aoqi@0: 
aoqi@0:         private boolean canIgnore(Symbol s) {
aoqi@0:             switch (s.kind) {
aoqi@0:                 case ABSENT_MTH:
aoqi@0:                     return true;
aoqi@0:                 case WRONG_MTH:
aoqi@0:                     InapplicableSymbolError errSym =
aoqi@0:                             (InapplicableSymbolError)s.baseSymbol();
aoqi@0:                     return new Template(MethodCheckDiag.ARITY_MISMATCH.regex())
aoqi@0:                             .matches(errSym.errCandidate().snd);
aoqi@0:                 case WRONG_MTHS:
aoqi@0:                     InapplicableSymbolsError errSyms =
aoqi@0:                             (InapplicableSymbolsError)s.baseSymbol();
aoqi@0:                     return errSyms.filterCandidates(errSyms.mapCandidates()).isEmpty();
aoqi@0:                 case WRONG_STATICNESS:
aoqi@0:                     return false;
aoqi@0:                 default:
aoqi@0:                     return false;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper for defining custom method-like lookup logic; a lookup helper
aoqi@0:      * provides hooks for (i) the actual lookup logic and (ii) accessing the
aoqi@0:      * lookup result (this step might result in compiler diagnostics to be generated)
aoqi@0:      */
aoqi@0:     abstract class LookupHelper {
aoqi@0: 
aoqi@0:         /** name of the symbol to lookup */
aoqi@0:         Name name;
aoqi@0: 
aoqi@0:         /** location in which the lookup takes place */
aoqi@0:         Type site;
aoqi@0: 
aoqi@0:         /** actual types used during the lookup */
aoqi@0:         List<Type> argtypes;
aoqi@0: 
aoqi@0:         /** type arguments used during the lookup */
aoqi@0:         List<Type> typeargtypes;
aoqi@0: 
aoqi@0:         /** Max overload resolution phase handled by this helper */
aoqi@0:         MethodResolutionPhase maxPhase;
aoqi@0: 
aoqi@0:         LookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             this.name = name;
aoqi@0:             this.site = site;
aoqi@0:             this.argtypes = argtypes;
aoqi@0:             this.typeargtypes = typeargtypes;
aoqi@0:             this.maxPhase = maxPhase;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Should lookup stop at given phase with given result
aoqi@0:          */
mcimadamore@2559:         final boolean shouldStop(Symbol sym, MethodResolutionPhase phase) {
aoqi@0:             return phase.ordinal() > maxPhase.ordinal() ||
aoqi@0:                     sym.kind < ERRONEOUS || sym.kind == AMBIGUOUS;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Search for a symbol under a given overload resolution phase - this method
aoqi@0:          * is usually called several times, once per each overload resolution phase
aoqi@0:          */
aoqi@0:         abstract Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase);
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Dump overload resolution info
aoqi@0:          */
aoqi@0:         void debug(DiagnosticPosition pos, Symbol sym) {
aoqi@0:             //do nothing
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Validate the result of the lookup
aoqi@0:          */
aoqi@0:         abstract Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym);
aoqi@0:     }
aoqi@0: 
aoqi@0:     abstract class BasicLookupHelper extends LookupHelper {
aoqi@0: 
aoqi@0:         BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:             this(name, site, argtypes, typeargtypes, MethodResolutionPhase.VARARITY);
aoqi@0:         }
aoqi@0: 
aoqi@0:         BasicLookupHelper(Name name, Type site, List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(name, site, argtypes, typeargtypes, maxPhase);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:             Symbol sym = doLookup(env, phase);
aoqi@0:             if (sym.kind == AMBIGUOUS) {
aoqi@0:                 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
aoqi@0:                 sym = a_err.mergeAbstracts(site);
aoqi@0:             }
aoqi@0:             return sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         abstract Symbol doLookup(Env<AttrContext> env, MethodResolutionPhase phase);
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
aoqi@0:             if (sym.kind >= AMBIGUOUS) {
aoqi@0:                 //if nothing is found return the 'first' error
aoqi@0:                 sym = accessMethod(sym, pos, location, site, name, true, argtypes, typeargtypes);
aoqi@0:             }
aoqi@0:             return sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         void debug(DiagnosticPosition pos, Symbol sym) {
aoqi@0:             reportVerboseResolutionDiagnostic(pos, name, site, argtypes, typeargtypes, sym);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for member reference lookup. A reference lookup helper
aoqi@0:      * defines the basic logic for member reference lookup; a method gives
aoqi@0:      * access to an 'unbound' helper used to perform an unbound member
aoqi@0:      * reference lookup.
aoqi@0:      */
aoqi@0:     abstract class ReferenceLookupHelper extends LookupHelper {
aoqi@0: 
aoqi@0:         /** The member reference tree */
aoqi@0:         JCMemberReference referenceTree;
aoqi@0: 
aoqi@0:         ReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
aoqi@0:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(name, site, argtypes, typeargtypes, maxPhase);
aoqi@0:             this.referenceTree = referenceTree;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Returns an unbound version of this lookup helper. By default, this
aoqi@0:          * method returns an dummy lookup helper.
aoqi@0:          */
aoqi@0:         ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
aoqi@0:             //dummy loopkup helper that always return 'methodNotFound'
aoqi@0:             return new ReferenceLookupHelper(referenceTree, name, site, argtypes, typeargtypes, maxPhase) {
aoqi@0:                 @Override
aoqi@0:                 ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
aoqi@0:                     return this;
aoqi@0:                 }
aoqi@0:                 @Override
aoqi@0:                 Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:                     return methodNotFound;
aoqi@0:                 }
aoqi@0:                 @Override
aoqi@0:                 ReferenceKind referenceKind(Symbol sym) {
aoqi@0:                     Assert.error();
aoqi@0:                     return null;
aoqi@0:                 }
aoqi@0:             };
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Get the kind of the member reference
aoqi@0:          */
aoqi@0:         abstract JCMemberReference.ReferenceKind referenceKind(Symbol sym);
aoqi@0: 
aoqi@0:         Symbol access(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, Symbol sym) {
aoqi@0:             if (sym.kind == AMBIGUOUS) {
aoqi@0:                 AmbiguityError a_err = (AmbiguityError)sym.baseSymbol();
aoqi@0:                 sym = a_err.mergeAbstracts(site);
aoqi@0:             }
aoqi@0:             //skip error reporting
aoqi@0:             return sym;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for method reference lookup. The lookup logic is based
aoqi@0:      * upon Resolve.findMethod; in certain cases, this helper class has a
aoqi@0:      * corresponding unbound helper class (see UnboundMethodReferenceLookupHelper).
aoqi@0:      * In such cases, non-static lookup results are thrown away.
aoqi@0:      */
aoqi@0:     class MethodReferenceLookupHelper extends ReferenceLookupHelper {
aoqi@0: 
aoqi@0:         MethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
aoqi@0:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(referenceTree, name, site, argtypes, typeargtypes, maxPhase);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         final Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:             return findMethod(env, site, name, argtypes, typeargtypes,
aoqi@0:                     phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
aoqi@0:             if (TreeInfo.isStaticSelector(referenceTree.expr, names) &&
aoqi@0:                     argtypes.nonEmpty() &&
aoqi@0:                     (argtypes.head.hasTag(NONE) ||
aoqi@0:                     types.isSubtypeUnchecked(inferenceContext.asUndetVar(argtypes.head), site))) {
aoqi@0:                 return new UnboundMethodReferenceLookupHelper(referenceTree, name,
aoqi@0:                         site, argtypes, typeargtypes, maxPhase);
aoqi@0:             } else {
aoqi@0:                 return super.unboundLookup(inferenceContext);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceKind referenceKind(Symbol sym) {
aoqi@0:             if (sym.isStatic()) {
aoqi@0:                 return ReferenceKind.STATIC;
aoqi@0:             } else {
aoqi@0:                 Name selName = TreeInfo.name(referenceTree.getQualifierExpression());
aoqi@0:                 return selName != null && selName == names._super ?
aoqi@0:                         ReferenceKind.SUPER :
aoqi@0:                         ReferenceKind.BOUND;
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for unbound method reference lookup. Essentially the same
aoqi@0:      * as the basic method reference lookup helper; main difference is that static
aoqi@0:      * lookup results are thrown away. If qualifier type is raw, an attempt to
aoqi@0:      * infer a parameterized type is made using the first actual argument (that
aoqi@0:      * would otherwise be ignored during the lookup).
aoqi@0:      */
aoqi@0:     class UnboundMethodReferenceLookupHelper extends MethodReferenceLookupHelper {
aoqi@0: 
aoqi@0:         UnboundMethodReferenceLookupHelper(JCMemberReference referenceTree, Name name, Type site,
aoqi@0:                 List<Type> argtypes, List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(referenceTree, name, site, argtypes.tail, typeargtypes, maxPhase);
aoqi@0:             if (site.isRaw() && !argtypes.head.hasTag(NONE)) {
aoqi@0:                 Type asSuperSite = types.asSuper(argtypes.head, site.tsym);
vromero@2611:                 this.site = types.capture(asSuperSite);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceLookupHelper unboundLookup(InferenceContext inferenceContext) {
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceKind referenceKind(Symbol sym) {
aoqi@0:             return ReferenceKind.UNBOUND;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for array constructor lookup; an array constructor lookup
aoqi@0:      * is simulated by looking up a method that returns the array type specified
aoqi@0:      * as qualifier, and that accepts a single int parameter (size of the array).
aoqi@0:      */
aoqi@0:     class ArrayConstructorReferenceLookupHelper extends ReferenceLookupHelper {
aoqi@0: 
aoqi@0:         ArrayConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:             Scope sc = new Scope(syms.arrayClass);
aoqi@0:             MethodSymbol arrayConstr = new MethodSymbol(PUBLIC, name, null, site.tsym);
aoqi@0:             arrayConstr.type = new MethodType(List.<Type>of(syms.intType), site, List.<Type>nil(), syms.methodClass);
aoqi@0:             sc.enter(arrayConstr);
aoqi@0:             return findMethodInScope(env, site, name, argtypes, typeargtypes, sc, methodNotFound, phase.isBoxingRequired(), phase.isVarargsRequired(), false, false);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceKind referenceKind(Symbol sym) {
aoqi@0:             return ReferenceKind.ARRAY_CTOR;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for constructor reference lookup. The lookup logic is based
aoqi@0:      * upon either Resolve.findMethod or Resolve.findDiamond - depending on
aoqi@0:      * whether the constructor reference needs diamond inference (this is the case
aoqi@0:      * if the qualifier type is raw). A special erroneous symbol is returned
aoqi@0:      * if the lookup returns the constructor of an inner class and there's no
aoqi@0:      * enclosing instance in scope.
aoqi@0:      */
aoqi@0:     class ConstructorReferenceLookupHelper extends ReferenceLookupHelper {
aoqi@0: 
aoqi@0:         boolean needsInference;
aoqi@0: 
aoqi@0:         ConstructorReferenceLookupHelper(JCMemberReference referenceTree, Type site, List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes, MethodResolutionPhase maxPhase) {
aoqi@0:             super(referenceTree, names.init, site, argtypes, typeargtypes, maxPhase);
aoqi@0:             if (site.isRaw()) {
aoqi@0:                 this.site = new ClassType(site.getEnclosingType(), site.tsym.type.getTypeArguments(), site.tsym);
aoqi@0:                 needsInference = true;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Symbol lookup(Env<AttrContext> env, MethodResolutionPhase phase) {
aoqi@0:             Symbol sym = needsInference ?
aoqi@0:                 findDiamond(env, site, argtypes, typeargtypes, phase.isBoxingRequired(), phase.isVarargsRequired()) :
aoqi@0:                 findMethod(env, site, name, argtypes, typeargtypes,
aoqi@0:                         phase.isBoxingRequired(), phase.isVarargsRequired(), syms.operatorNames.contains(name));
aoqi@0:             return sym.kind != MTH ||
aoqi@0:                           site.getEnclosingType().hasTag(NONE) ||
aoqi@0:                           hasEnclosingInstance(env, site) ?
aoqi@0:                           sym : new InvalidSymbolError(Kinds.MISSING_ENCL, sym, null) {
aoqi@0:                     @Override
aoqi@0:                     JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:                        return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                             "cant.access.inner.cls.constr", site.tsym.name, argtypes, site.getEnclosingType());
aoqi@0:                     }
aoqi@0:                 };
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         ReferenceKind referenceKind(Symbol sym) {
aoqi@0:             return site.getEnclosingType().hasTag(NONE) ?
aoqi@0:                     ReferenceKind.TOPLEVEL : ReferenceKind.IMPLICIT_INNER;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Main overload resolution routine. On each overload resolution step, a
aoqi@0:      * lookup helper class is used to perform the method/constructor lookup;
aoqi@0:      * at the end of the lookup, the helper is used to validate the results
aoqi@0:      * (this last step might trigger overload resolution diagnostics).
aoqi@0:      */
aoqi@0:     Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location, MethodCheck methodCheck, LookupHelper lookupHelper) {
aoqi@0:         MethodResolutionContext resolveContext = new MethodResolutionContext();
aoqi@0:         resolveContext.methodCheck = methodCheck;
aoqi@0:         return lookupMethod(env, pos, location, resolveContext, lookupHelper);
aoqi@0:     }
aoqi@0: 
aoqi@0:     Symbol lookupMethod(Env<AttrContext> env, DiagnosticPosition pos, Symbol location,
aoqi@0:             MethodResolutionContext resolveContext, LookupHelper lookupHelper) {
aoqi@0:         MethodResolutionContext prevResolutionContext = currentResolutionContext;
aoqi@0:         try {
aoqi@0:             Symbol bestSoFar = methodNotFound;
aoqi@0:             currentResolutionContext = resolveContext;
aoqi@0:             for (MethodResolutionPhase phase : methodResolutionSteps) {
aoqi@0:                 if (!phase.isApplicable(boxingEnabled, varargsEnabled) ||
aoqi@0:                         lookupHelper.shouldStop(bestSoFar, phase)) break;
aoqi@0:                 MethodResolutionPhase prevPhase = currentResolutionContext.step;
aoqi@0:                 Symbol prevBest = bestSoFar;
aoqi@0:                 currentResolutionContext.step = phase;
aoqi@0:                 Symbol sym = lookupHelper.lookup(env, phase);
aoqi@0:                 lookupHelper.debug(pos, sym);
aoqi@0:                 bestSoFar = phase.mergeResults(bestSoFar, sym);
aoqi@0:                 env.info.pendingResolutionPhase = (prevBest == bestSoFar) ? prevPhase : phase;
aoqi@0:             }
aoqi@0:             return lookupHelper.access(env, pos, location, bestSoFar);
aoqi@0:         } finally {
aoqi@0:             currentResolutionContext = prevResolutionContext;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Resolve `c.name' where name == this or name == super.
aoqi@0:      * @param pos           The position to use for error reporting.
aoqi@0:      * @param env           The environment current at the expression.
aoqi@0:      * @param c             The qualifier.
aoqi@0:      * @param name          The identifier's name.
aoqi@0:      */
aoqi@0:     Symbol resolveSelf(DiagnosticPosition pos,
aoqi@0:                        Env<AttrContext> env,
aoqi@0:                        TypeSymbol c,
aoqi@0:                        Name name) {
aoqi@0:         Env<AttrContext> env1 = env;
aoqi@0:         boolean staticOnly = false;
aoqi@0:         while (env1.outer != null) {
aoqi@0:             if (isStatic(env1)) staticOnly = true;
aoqi@0:             if (env1.enclClass.sym == c) {
aoqi@0:                 Symbol sym = env1.info.scope.lookup(name).sym;
aoqi@0:                 if (sym != null) {
aoqi@0:                     if (staticOnly) sym = new StaticError(sym);
aoqi@0:                     return accessBase(sym, pos, env.enclClass.sym.type,
aoqi@0:                                   name, true);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
aoqi@0:             env1 = env1.outer;
aoqi@0:         }
aoqi@0:         if (c.isInterface() &&
aoqi@0:             name == names._super && !isStatic(env) &&
aoqi@0:             types.isDirectSuperInterface(c, env.enclClass.sym)) {
aoqi@0:             //this might be a default super call if one of the superinterfaces is 'c'
aoqi@0:             for (Type t : pruneInterfaces(env.enclClass.type)) {
aoqi@0:                 if (t.tsym == c) {
aoqi@0:                     env.info.defaultSuperCallSite = t;
aoqi@0:                     return new VarSymbol(0, names._super,
aoqi@0:                             types.asSuper(env.enclClass.type, c), env.enclClass.sym);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             //find a direct superinterface that is a subtype of 'c'
aoqi@0:             for (Type i : types.interfaces(env.enclClass.type)) {
aoqi@0:                 if (i.tsym.isSubClass(c, types) && i.tsym != c) {
aoqi@0:                     log.error(pos, "illegal.default.super.call", c,
aoqi@0:                             diags.fragment("redundant.supertype", c, i));
aoqi@0:                     return syms.errSymbol;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             Assert.error();
aoqi@0:         }
aoqi@0:         log.error(pos, "not.encl.class", c);
aoqi@0:         return syms.errSymbol;
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     private List<Type> pruneInterfaces(Type t) {
aoqi@0:         ListBuffer<Type> result = new ListBuffer<>();
aoqi@0:         for (Type t1 : types.interfaces(t)) {
aoqi@0:             boolean shouldAdd = true;
aoqi@0:             for (Type t2 : types.interfaces(t)) {
aoqi@0:                 if (t1 != t2 && types.isSubtypeNoCapture(t2, t1)) {
aoqi@0:                     shouldAdd = false;
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             if (shouldAdd) {
aoqi@0:                 result.append(t1);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return result.toList();
aoqi@0:     }
aoqi@0: 
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Resolve `c.this' for an enclosing class c that contains the
aoqi@0:      * named member.
aoqi@0:      * @param pos           The position to use for error reporting.
aoqi@0:      * @param env           The environment current at the expression.
aoqi@0:      * @param member        The member that must be contained in the result.
aoqi@0:      */
aoqi@0:     Symbol resolveSelfContaining(DiagnosticPosition pos,
aoqi@0:                                  Env<AttrContext> env,
aoqi@0:                                  Symbol member,
aoqi@0:                                  boolean isSuperCall) {
aoqi@0:         Symbol sym = resolveSelfContainingInternal(env, member, isSuperCall);
aoqi@0:         if (sym == null) {
aoqi@0:             log.error(pos, "encl.class.required", member);
aoqi@0:             return syms.errSymbol;
aoqi@0:         } else {
aoqi@0:             return accessBase(sym, pos, env.enclClass.sym.type, sym.name, true);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     boolean hasEnclosingInstance(Env<AttrContext> env, Type type) {
aoqi@0:         Symbol encl = resolveSelfContainingInternal(env, type.tsym, false);
aoqi@0:         return encl != null && encl.kind < ERRONEOUS;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private Symbol resolveSelfContainingInternal(Env<AttrContext> env,
aoqi@0:                                  Symbol member,
aoqi@0:                                  boolean isSuperCall) {
aoqi@0:         Name name = names._this;
aoqi@0:         Env<AttrContext> env1 = isSuperCall ? env.outer : env;
aoqi@0:         boolean staticOnly = false;
aoqi@0:         if (env1 != null) {
aoqi@0:             while (env1 != null && env1.outer != null) {
aoqi@0:                 if (isStatic(env1)) staticOnly = true;
aoqi@0:                 if (env1.enclClass.sym.isSubClass(member.owner, types)) {
aoqi@0:                     Symbol sym = env1.info.scope.lookup(name).sym;
aoqi@0:                     if (sym != null) {
aoqi@0:                         if (staticOnly) sym = new StaticError(sym);
aoqi@0:                         return sym;
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 if ((env1.enclClass.sym.flags() & STATIC) != 0)
aoqi@0:                     staticOnly = true;
aoqi@0:                 env1 = env1.outer;
aoqi@0:             }
aoqi@0:         }
aoqi@0:         return null;
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Resolve an appropriate implicit this instance for t's container.
aoqi@0:      * JLS 8.8.5.1 and 15.9.2
aoqi@0:      */
aoqi@0:     Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t) {
aoqi@0:         return resolveImplicitThis(pos, env, t, false);
aoqi@0:     }
aoqi@0: 
aoqi@0:     Type resolveImplicitThis(DiagnosticPosition pos, Env<AttrContext> env, Type t, boolean isSuperCall) {
aoqi@0:         Type thisType = (((t.tsym.owner.kind & (MTH|VAR)) != 0)
aoqi@0:                          ? resolveSelf(pos, env, t.getEnclosingType().tsym, names._this)
aoqi@0:                          : resolveSelfContaining(pos, env, t.tsym, isSuperCall)).type;
aoqi@0:         if (env.info.isSelfCall && thisType.tsym == env.enclClass.sym)
aoqi@0:             log.error(pos, "cant.ref.before.ctor.called", "this");
aoqi@0:         return thisType;
aoqi@0:     }
aoqi@0: 
aoqi@0: /* ***************************************************************************
aoqi@0:  *  ResolveError classes, indicating error situations when accessing symbols
aoqi@0:  ****************************************************************************/
aoqi@0: 
aoqi@0:     //used by TransTypes when checking target type of synthetic cast
aoqi@0:     public void logAccessErrorInternal(Env<AttrContext> env, JCTree tree, Type type) {
aoqi@0:         AccessError error = new AccessError(env, env.enclClass.type, type.tsym);
aoqi@0:         logResolveError(error, tree.pos(), env.enclClass.sym, env.enclClass.type, null, null, null);
aoqi@0:     }
aoqi@0:     //where
aoqi@0:     private void logResolveError(ResolveError error,
aoqi@0:             DiagnosticPosition pos,
aoqi@0:             Symbol location,
aoqi@0:             Type site,
aoqi@0:             Name name,
aoqi@0:             List<Type> argtypes,
aoqi@0:             List<Type> typeargtypes) {
aoqi@0:         JCDiagnostic d = error.getDiagnostic(JCDiagnostic.DiagnosticType.ERROR,
aoqi@0:                 pos, location, site, name, argtypes, typeargtypes);
aoqi@0:         if (d != null) {
aoqi@0:             d.setFlag(DiagnosticFlag.RESOLVE_ERROR);
aoqi@0:             log.report(d);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     private final LocalizedString noArgs = new LocalizedString("compiler.misc.no.args");
aoqi@0: 
aoqi@0:     public Object methodArguments(List<Type> argtypes) {
aoqi@0:         if (argtypes == null || argtypes.isEmpty()) {
aoqi@0:             return noArgs;
aoqi@0:         } else {
aoqi@0:             ListBuffer<Object> diagArgs = new ListBuffer<>();
aoqi@0:             for (Type t : argtypes) {
aoqi@0:                 if (t.hasTag(DEFERRED)) {
aoqi@0:                     diagArgs.append(((DeferredAttr.DeferredType)t).tree);
aoqi@0:                 } else {
aoqi@0:                     diagArgs.append(t);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             return diagArgs;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Root class for resolution errors. Subclass of ResolveError
aoqi@0:      * represent a different kinds of resolution error - as such they must
aoqi@0:      * specify how they map into concrete compiler diagnostics.
aoqi@0:      */
aoqi@0:     abstract class ResolveError extends Symbol {
aoqi@0: 
aoqi@0:         /** The name of the kind of error, for debugging only. */
aoqi@0:         final String debugName;
aoqi@0: 
aoqi@0:         ResolveError(int kind, String debugName) {
aoqi@0:             super(kind, 0, null, null, null);
aoqi@0:             this.debugName = debugName;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public <R, P> R accept(ElementVisitor<R, P> v, P p) {
aoqi@0:             throw new AssertionError();
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             return debugName;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return false;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean isStatic() {
aoqi@0:             return false;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Create an external representation for this erroneous symbol to be
aoqi@0:          * used during attribution - by default this returns the symbol of a
aoqi@0:          * brand new error type which stores the original type found
aoqi@0:          * during resolution.
aoqi@0:          *
aoqi@0:          * @param name     the name used during resolution
aoqi@0:          * @param location the location from which the symbol is accessed
aoqi@0:          */
aoqi@0:         protected Symbol access(Name name, TypeSymbol location) {
aoqi@0:             return types.createErrorType(name, location, syms.errSymbol.type).tsym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * Create a diagnostic representing this resolution error.
aoqi@0:          *
aoqi@0:          * @param dkind     The kind of the diagnostic to be created (e.g error).
aoqi@0:          * @param pos       The position to be used for error reporting.
aoqi@0:          * @param site      The original type from where the selection took place.
aoqi@0:          * @param name      The name of the symbol to be resolved.
aoqi@0:          * @param argtypes  The invocation's value arguments,
aoqi@0:          *                  if we looked for a method.
aoqi@0:          * @param typeargtypes  The invocation's type arguments,
aoqi@0:          *                      if we looked for a method.
aoqi@0:          */
aoqi@0:         abstract JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes);
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * This class is the root class of all resolution errors caused by
aoqi@0:      * an invalid symbol being found during resolution.
aoqi@0:      */
aoqi@0:     abstract class InvalidSymbolError extends ResolveError {
aoqi@0: 
aoqi@0:         /** The invalid symbol found during resolution */
aoqi@0:         Symbol sym;
aoqi@0: 
aoqi@0:         InvalidSymbolError(int kind, Symbol sym, String debugName) {
aoqi@0:             super(kind, debugName);
aoqi@0:             this.sym = sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:              return super.toString() + " wrongSym=" + sym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Symbol access(Name name, TypeSymbol location) {
aoqi@0:             if ((sym.kind & ERRONEOUS) == 0 && (sym.kind & TYP) != 0)
aoqi@0:                 return types.createErrorType(name, location, sym.type).tsym;
aoqi@0:             else
aoqi@0:                 return sym;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * InvalidSymbolError error class indicating that a symbol matching a
aoqi@0:      * given name does not exists in a given site.
aoqi@0:      */
aoqi@0:     class SymbolNotFoundError extends ResolveError {
aoqi@0: 
aoqi@0:         SymbolNotFoundError(int kind) {
aoqi@0:             this(kind, "symbol not found error");
aoqi@0:         }
aoqi@0: 
aoqi@0:         SymbolNotFoundError(int kind, String debugName) {
aoqi@0:             super(kind, debugName);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             argtypes = argtypes == null ? List.<Type>nil() : argtypes;
aoqi@0:             typeargtypes = typeargtypes == null ? List.<Type>nil() : typeargtypes;
aoqi@0:             if (name == names.error)
aoqi@0:                 return null;
aoqi@0: 
aoqi@0:             if (syms.operatorNames.contains(name)) {
aoqi@0:                 boolean isUnaryOp = argtypes.size() == 1;
aoqi@0:                 String key = argtypes.size() == 1 ?
aoqi@0:                     "operator.cant.be.applied" :
aoqi@0:                     "operator.cant.be.applied.1";
aoqi@0:                 Type first = argtypes.head;
aoqi@0:                 Type second = !isUnaryOp ? argtypes.tail.head : null;
aoqi@0:                 return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                         key, name, first, second);
aoqi@0:             }
aoqi@0:             boolean hasLocation = false;
aoqi@0:             if (location == null) {
aoqi@0:                 location = site.tsym;
aoqi@0:             }
aoqi@0:             if (!location.name.isEmpty()) {
aoqi@0:                 if (location.kind == PCK && !site.tsym.exists()) {
aoqi@0:                     return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                         "doesnt.exist", location);
aoqi@0:                 }
aoqi@0:                 hasLocation = !location.name.equals(names._this) &&
aoqi@0:                         !location.name.equals(names._super);
aoqi@0:             }
aoqi@0:             boolean isConstructor = (kind == ABSENT_MTH || kind == WRONG_STATICNESS) &&
aoqi@0:                     name == names.init;
aoqi@0:             KindName kindname = isConstructor ? KindName.CONSTRUCTOR : absentKind(kind);
aoqi@0:             Name idname = isConstructor ? site.tsym.name : name;
aoqi@0:             String errKey = getErrorKey(kindname, typeargtypes.nonEmpty(), hasLocation);
aoqi@0:             if (hasLocation) {
aoqi@0:                 return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                         errKey, kindname, idname, //symbol kindname, name
aoqi@0:                         typeargtypes, args(argtypes), //type parameters and arguments (if any)
aoqi@0:                         getLocationDiag(location, site)); //location kindname, type
aoqi@0:             }
aoqi@0:             else {
aoqi@0:                 return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                         errKey, kindname, idname, //symbol kindname, name
aoqi@0:                         typeargtypes, args(argtypes)); //type parameters and arguments (if any)
aoqi@0:             }
aoqi@0:         }
aoqi@0:         //where
aoqi@0:         private Object args(List<Type> args) {
aoqi@0:             return args.isEmpty() ? args : methodArguments(args);
aoqi@0:         }
aoqi@0: 
aoqi@0:         private String getErrorKey(KindName kindname, boolean hasTypeArgs, boolean hasLocation) {
aoqi@0:             String key = "cant.resolve";
aoqi@0:             String suffix = hasLocation ? ".location" : "";
aoqi@0:             switch (kindname) {
aoqi@0:                 case METHOD:
aoqi@0:                 case CONSTRUCTOR: {
aoqi@0:                     suffix += ".args";
aoqi@0:                     suffix += hasTypeArgs ? ".params" : "";
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             return key + suffix;
aoqi@0:         }
aoqi@0:         private JCDiagnostic getLocationDiag(Symbol location, Type site) {
aoqi@0:             if (location.kind == VAR) {
aoqi@0:                 return diags.fragment("location.1",
aoqi@0:                     kindName(location),
aoqi@0:                     location,
aoqi@0:                     location.type);
aoqi@0:             } else {
aoqi@0:                 return diags.fragment("location",
aoqi@0:                     typeKindName(site),
aoqi@0:                     site,
aoqi@0:                     null);
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * InvalidSymbolError error class indicating that a given symbol
aoqi@0:      * (either a method, a constructor or an operand) is not applicable
aoqi@0:      * given an actual arguments/type argument list.
aoqi@0:      */
aoqi@0:     class InapplicableSymbolError extends ResolveError {
aoqi@0: 
aoqi@0:         protected MethodResolutionContext resolveContext;
aoqi@0: 
aoqi@0:         InapplicableSymbolError(MethodResolutionContext context) {
aoqi@0:             this(WRONG_MTH, "inapplicable symbol error", context);
aoqi@0:         }
aoqi@0: 
aoqi@0:         protected InapplicableSymbolError(int kind, String debugName, MethodResolutionContext context) {
aoqi@0:             super(kind, debugName);
aoqi@0:             this.resolveContext = context;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public String toString() {
aoqi@0:             return super.toString();
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             if (name == names.error)
aoqi@0:                 return null;
aoqi@0: 
aoqi@0:             if (syms.operatorNames.contains(name)) {
aoqi@0:                 boolean isUnaryOp = argtypes.size() == 1;
aoqi@0:                 String key = argtypes.size() == 1 ?
aoqi@0:                     "operator.cant.be.applied" :
aoqi@0:                     "operator.cant.be.applied.1";
aoqi@0:                 Type first = argtypes.head;
aoqi@0:                 Type second = !isUnaryOp ? argtypes.tail.head : null;
aoqi@0:                 return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                         key, name, first, second);
aoqi@0:             }
aoqi@0:             else {
aoqi@0:                 Pair<Symbol, JCDiagnostic> c = errCandidate();
aoqi@0:                 if (compactMethodDiags) {
aoqi@0:                     for (Map.Entry<Template, DiagnosticRewriter> _entry :
aoqi@0:                             MethodResolutionDiagHelper.rewriters.entrySet()) {
aoqi@0:                         if (_entry.getKey().matches(c.snd)) {
aoqi@0:                             JCDiagnostic simpleDiag =
aoqi@0:                                     _entry.getValue().rewriteDiagnostic(diags, pos,
aoqi@0:                                         log.currentSource(), dkind, c.snd);
aoqi@0:                             simpleDiag.setFlag(DiagnosticFlag.COMPRESSED);
aoqi@0:                             return simpleDiag;
aoqi@0:                         }
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 Symbol ws = c.fst.asMemberOf(site, types);
aoqi@0:                 return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                           "cant.apply.symbol",
aoqi@0:                           kindName(ws),
aoqi@0:                           ws.name == names.init ? ws.owner.name : ws.name,
aoqi@0:                           methodArguments(ws.type.getParameterTypes()),
aoqi@0:                           methodArguments(argtypes),
aoqi@0:                           kindName(ws.owner),
aoqi@0:                           ws.owner.type,
aoqi@0:                           c.snd);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Symbol access(Name name, TypeSymbol location) {
aoqi@0:             return types.createErrorType(name, location, syms.errSymbol.type).tsym;
aoqi@0:         }
aoqi@0: 
aoqi@0:         protected Pair<Symbol, JCDiagnostic> errCandidate() {
aoqi@0:             Candidate bestSoFar = null;
aoqi@0:             for (Candidate c : resolveContext.candidates) {
aoqi@0:                 if (c.isApplicable()) continue;
aoqi@0:                 bestSoFar = c;
aoqi@0:             }
aoqi@0:             Assert.checkNonNull(bestSoFar);
aoqi@0:             return new Pair<Symbol, JCDiagnostic>(bestSoFar.sym, bestSoFar.details);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * ResolveError error class indicating that a set of symbols
aoqi@0:      * (either methods, constructors or operands) is not applicable
aoqi@0:      * given an actual arguments/type argument list.
aoqi@0:      */
aoqi@0:     class InapplicableSymbolsError extends InapplicableSymbolError {
aoqi@0: 
aoqi@0:         InapplicableSymbolsError(MethodResolutionContext context) {
aoqi@0:             super(WRONG_MTHS, "inapplicable symbols", context);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             Map<Symbol, JCDiagnostic> candidatesMap = mapCandidates();
aoqi@0:             Map<Symbol, JCDiagnostic> filteredCandidates = compactMethodDiags ?
aoqi@0:                     filterCandidates(candidatesMap) :
aoqi@0:                     mapCandidates();
aoqi@0:             if (filteredCandidates.isEmpty()) {
aoqi@0:                 filteredCandidates = candidatesMap;
aoqi@0:             }
aoqi@0:             boolean truncatedDiag = candidatesMap.size() != filteredCandidates.size();
aoqi@0:             if (filteredCandidates.size() > 1) {
aoqi@0:                 JCDiagnostic err = diags.create(dkind,
aoqi@0:                         null,
aoqi@0:                         truncatedDiag ?
aoqi@0:                             EnumSet.of(DiagnosticFlag.COMPRESSED) :
aoqi@0:                             EnumSet.noneOf(DiagnosticFlag.class),
aoqi@0:                         log.currentSource(),
aoqi@0:                         pos,
aoqi@0:                         "cant.apply.symbols",
aoqi@0:                         name == names.init ? KindName.CONSTRUCTOR : absentKind(kind),
aoqi@0:                         name == names.init ? site.tsym.name : name,
aoqi@0:                         methodArguments(argtypes));
aoqi@0:                 return new JCDiagnostic.MultilineDiagnostic(err, candidateDetails(filteredCandidates, site));
aoqi@0:             } else if (filteredCandidates.size() == 1) {
aoqi@0:                 Map.Entry<Symbol, JCDiagnostic> _e =
aoqi@0:                                 filteredCandidates.entrySet().iterator().next();
aoqi@0:                 final Pair<Symbol, JCDiagnostic> p = new Pair<Symbol, JCDiagnostic>(_e.getKey(), _e.getValue());
aoqi@0:                 JCDiagnostic d = new InapplicableSymbolError(resolveContext) {
aoqi@0:                     @Override
aoqi@0:                     protected Pair<Symbol, JCDiagnostic> errCandidate() {
aoqi@0:                         return p;
aoqi@0:                     }
aoqi@0:                 }.getDiagnostic(dkind, pos,
aoqi@0:                     location, site, name, argtypes, typeargtypes);
aoqi@0:                 if (truncatedDiag) {
aoqi@0:                     d.setFlag(DiagnosticFlag.COMPRESSED);
aoqi@0:                 }
aoqi@0:                 return d;
aoqi@0:             } else {
aoqi@0:                 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind, pos,
aoqi@0:                     location, site, name, argtypes, typeargtypes);
aoqi@0:             }
aoqi@0:         }
aoqi@0:         //where
aoqi@0:             private Map<Symbol, JCDiagnostic> mapCandidates() {
aoqi@0:                 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<Symbol, JCDiagnostic>();
aoqi@0:                 for (Candidate c : resolveContext.candidates) {
aoqi@0:                     if (c.isApplicable()) continue;
aoqi@0:                     candidates.put(c.sym, c.details);
aoqi@0:                 }
aoqi@0:                 return candidates;
aoqi@0:             }
aoqi@0: 
aoqi@0:             Map<Symbol, JCDiagnostic> filterCandidates(Map<Symbol, JCDiagnostic> candidatesMap) {
aoqi@0:                 Map<Symbol, JCDiagnostic> candidates = new LinkedHashMap<Symbol, JCDiagnostic>();
aoqi@0:                 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
aoqi@0:                     JCDiagnostic d = _entry.getValue();
aoqi@0:                     if (!new Template(MethodCheckDiag.ARITY_MISMATCH.regex()).matches(d)) {
aoqi@0:                         candidates.put(_entry.getKey(), d);
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 return candidates;
aoqi@0:             }
aoqi@0: 
aoqi@0:             private List<JCDiagnostic> candidateDetails(Map<Symbol, JCDiagnostic> candidatesMap, Type site) {
aoqi@0:                 List<JCDiagnostic> details = List.nil();
aoqi@0:                 for (Map.Entry<Symbol, JCDiagnostic> _entry : candidatesMap.entrySet()) {
aoqi@0:                     Symbol sym = _entry.getKey();
aoqi@0:                     JCDiagnostic detailDiag = diags.fragment("inapplicable.method",
aoqi@0:                             Kinds.kindName(sym),
aoqi@0:                             sym.location(site, types),
aoqi@0:                             sym.asMemberOf(site, types),
aoqi@0:                             _entry.getValue());
aoqi@0:                     details = details.prepend(detailDiag);
aoqi@0:                 }
aoqi@0:                 //typically members are visited in reverse order (see Scope)
aoqi@0:                 //so we need to reverse the candidate list so that candidates
aoqi@0:                 //conform to source order
aoqi@0:                 return details;
aoqi@0:             }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * An InvalidSymbolError error class indicating that a symbol is not
aoqi@0:      * accessible from a given site
aoqi@0:      */
aoqi@0:     class AccessError extends InvalidSymbolError {
aoqi@0: 
aoqi@0:         private Env<AttrContext> env;
aoqi@0:         private Type site;
aoqi@0: 
aoqi@0:         AccessError(Symbol sym) {
aoqi@0:             this(null, null, sym);
aoqi@0:         }
aoqi@0: 
aoqi@0:         AccessError(Env<AttrContext> env, Type site, Symbol sym) {
aoqi@0:             super(HIDDEN, sym, "access error");
aoqi@0:             this.env = env;
aoqi@0:             this.site = site;
aoqi@0:             if (debugResolve)
aoqi@0:                 log.error("proc.messager", sym + " @ " + site + " is inaccessible.");
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return false;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             if (sym.owner.type.hasTag(ERROR))
aoqi@0:                 return null;
aoqi@0: 
aoqi@0:             if (sym.name == names.init && sym.owner != site.tsym) {
aoqi@0:                 return new SymbolNotFoundError(ABSENT_MTH).getDiagnostic(dkind,
aoqi@0:                         pos, location, site, name, argtypes, typeargtypes);
aoqi@0:             }
aoqi@0:             else if ((sym.flags() & PUBLIC) != 0
aoqi@0:                 || (env != null && this.site != null
aoqi@0:                     && !isAccessible(env, this.site))) {
aoqi@0:                 return diags.create(dkind, log.currentSource(),
aoqi@0:                         pos, "not.def.access.class.intf.cant.access",
aoqi@0:                     sym, sym.location());
aoqi@0:             }
aoqi@0:             else if ((sym.flags() & (PRIVATE | PROTECTED)) != 0) {
aoqi@0:                 return diags.create(dkind, log.currentSource(),
aoqi@0:                         pos, "report.access", sym,
aoqi@0:                         asFlagSet(sym.flags() & (PRIVATE | PROTECTED)),
aoqi@0:                         sym.location());
aoqi@0:             }
aoqi@0:             else {
aoqi@0:                 return diags.create(dkind, log.currentSource(),
aoqi@0:                         pos, "not.def.public.cant.access", sym, sym.location());
aoqi@0:             }
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * InvalidSymbolError error class indicating that an instance member
aoqi@0:      * has erroneously been accessed from a static context.
aoqi@0:      */
aoqi@0:     class StaticError extends InvalidSymbolError {
aoqi@0: 
aoqi@0:         StaticError(Symbol sym) {
aoqi@0:             super(STATICERR, sym, "static error");
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             Symbol errSym = ((sym.kind == TYP && sym.type.hasTag(CLASS))
aoqi@0:                 ? types.erasure(sym.type).tsym
aoqi@0:                 : sym);
aoqi@0:             return diags.create(dkind, log.currentSource(), pos,
aoqi@0:                     "non-static.cant.be.ref", kindName(sym), errSym);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * InvalidSymbolError error class indicating that a pair of symbols
aoqi@0:      * (either methods, constructors or operands) are ambiguous
aoqi@0:      * given an actual arguments/type argument list.
aoqi@0:      */
aoqi@0:     class AmbiguityError extends ResolveError {
aoqi@0: 
aoqi@0:         /** The other maximally specific symbol */
aoqi@0:         List<Symbol> ambiguousSyms = List.nil();
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         AmbiguityError(Symbol sym1, Symbol sym2) {
aoqi@0:             super(AMBIGUOUS, "ambiguity error");
aoqi@0:             ambiguousSyms = flatten(sym2).appendList(flatten(sym1));
aoqi@0:         }
aoqi@0: 
aoqi@0:         private List<Symbol> flatten(Symbol sym) {
aoqi@0:             if (sym.kind == AMBIGUOUS) {
aoqi@0:                 return ((AmbiguityError)sym.baseSymbol()).ambiguousSyms;
aoqi@0:             } else {
aoqi@0:                 return List.of(sym);
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         AmbiguityError addAmbiguousSymbol(Symbol s) {
aoqi@0:             ambiguousSyms = ambiguousSyms.prepend(s);
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(JCDiagnostic.DiagnosticType dkind,
aoqi@0:                 DiagnosticPosition pos,
aoqi@0:                 Symbol location,
aoqi@0:                 Type site,
aoqi@0:                 Name name,
aoqi@0:                 List<Type> argtypes,
aoqi@0:                 List<Type> typeargtypes) {
aoqi@0:             List<Symbol> diagSyms = ambiguousSyms.reverse();
aoqi@0:             Symbol s1 = diagSyms.head;
aoqi@0:             Symbol s2 = diagSyms.tail.head;
aoqi@0:             Name sname = s1.name;
aoqi@0:             if (sname == names.init) sname = s1.owner.name;
aoqi@0:             return diags.create(dkind, log.currentSource(),
aoqi@0:                       pos, "ref.ambiguous", sname,
aoqi@0:                       kindName(s1),
aoqi@0:                       s1,
aoqi@0:                       s1.location(site, types),
aoqi@0:                       kindName(s2),
aoqi@0:                       s2,
aoqi@0:                       s2.location(site, types));
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * If multiple applicable methods are found during overload and none of them
aoqi@0:          * is more specific than the others, attempt to merge their signatures.
aoqi@0:          */
aoqi@0:         Symbol mergeAbstracts(Type site) {
aoqi@0:             List<Symbol> ambiguousInOrder = ambiguousSyms.reverse();
aoqi@0:             for (Symbol s : ambiguousInOrder) {
aoqi@0:                 Type mt = types.memberType(site, s);
aoqi@0:                 boolean found = true;
aoqi@0:                 List<Type> allThrown = mt.getThrownTypes();
aoqi@0:                 for (Symbol s2 : ambiguousInOrder) {
aoqi@0:                     Type mt2 = types.memberType(site, s2);
aoqi@0:                     if ((s2.flags() & ABSTRACT) == 0 ||
aoqi@0:                         !types.overrideEquivalent(mt, mt2) ||
aoqi@0:                         !types.isSameTypes(s.erasure(types).getParameterTypes(),
aoqi@0:                                        s2.erasure(types).getParameterTypes())) {
aoqi@0:                         //ambiguity cannot be resolved
aoqi@0:                         return this;
aoqi@0:                     }
aoqi@0:                     Type mst = mostSpecificReturnType(mt, mt2);
aoqi@0:                     if (mst == null || mst != mt) {
aoqi@0:                         found = false;
aoqi@0:                         break;
aoqi@0:                     }
aoqi@0:                     allThrown = chk.intersect(allThrown, mt2.getThrownTypes());
aoqi@0:                 }
aoqi@0:                 if (found) {
aoqi@0:                     //all ambiguous methods were abstract and one method had
aoqi@0:                     //most specific return type then others
aoqi@0:                     return (allThrown == mt.getThrownTypes()) ?
aoqi@0:                             s : new MethodSymbol(
aoqi@0:                                 s.flags(),
aoqi@0:                                 s.name,
mcimadamore@2794:                                 types.createMethodTypeWithThrown(s.type, allThrown),
aoqi@0:                                 s.owner);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:             return this;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Symbol access(Name name, TypeSymbol location) {
aoqi@0:             Symbol firstAmbiguity = ambiguousSyms.last();
aoqi@0:             return firstAmbiguity.kind == TYP ?
aoqi@0:                     types.createErrorType(name, location, firstAmbiguity.type).tsym :
aoqi@0:                     firstAmbiguity;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     class BadVarargsMethod extends ResolveError {
aoqi@0: 
aoqi@0:         ResolveError delegatedError;
aoqi@0: 
aoqi@0:         BadVarargsMethod(ResolveError delegatedError) {
aoqi@0:             super(delegatedError.kind, "badVarargs");
aoqi@0:             this.delegatedError = delegatedError;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public Symbol baseSymbol() {
aoqi@0:             return delegatedError.baseSymbol();
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         protected Symbol access(Name name, TypeSymbol location) {
aoqi@0:             return delegatedError.access(name, location);
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         public boolean exists() {
aoqi@0:             return true;
aoqi@0:         }
aoqi@0: 
aoqi@0:         @Override
aoqi@0:         JCDiagnostic getDiagnostic(DiagnosticType dkind, DiagnosticPosition pos, Symbol location, Type site, Name name, List<Type> argtypes, List<Type> typeargtypes) {
aoqi@0:             return delegatedError.getDiagnostic(dkind, pos, location, site, name, argtypes, typeargtypes);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * Helper class for method resolution diagnostic simplification.
aoqi@0:      * Certain resolution diagnostic are rewritten as simpler diagnostic
aoqi@0:      * where the enclosing resolution diagnostic (i.e. 'inapplicable method')
aoqi@0:      * is stripped away, as it doesn't carry additional info. The logic
aoqi@0:      * for matching a given diagnostic is given in terms of a template
aoqi@0:      * hierarchy: a diagnostic template can be specified programmatically,
aoqi@0:      * so that only certain diagnostics are matched. Each templete is then
aoqi@0:      * associated with a rewriter object that carries out the task of rewtiting
aoqi@0:      * the diagnostic to a simpler one.
aoqi@0:      */
aoqi@0:     static class MethodResolutionDiagHelper {
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * A diagnostic rewriter transforms a method resolution diagnostic
aoqi@0:          * into a simpler one
aoqi@0:          */
aoqi@0:         interface DiagnosticRewriter {
aoqi@0:             JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
aoqi@0:                     DiagnosticPosition preferedPos, DiagnosticSource preferredSource,
aoqi@0:                     DiagnosticType preferredKind, JCDiagnostic d);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * A diagnostic template is made up of two ingredients: (i) a regular
aoqi@0:          * expression for matching a diagnostic key and (ii) a list of sub-templates
aoqi@0:          * for matching diagnostic arguments.
aoqi@0:          */
aoqi@0:         static class Template {
aoqi@0: 
aoqi@0:             /** regex used to match diag key */
aoqi@0:             String regex;
aoqi@0: 
aoqi@0:             /** templates used to match diagnostic args */
aoqi@0:             Template[] subTemplates;
aoqi@0: 
aoqi@0:             Template(String key, Template... subTemplates) {
aoqi@0:                 this.regex = key;
aoqi@0:                 this.subTemplates = subTemplates;
aoqi@0:             }
aoqi@0: 
aoqi@0:             /**
aoqi@0:              * Returns true if the regex matches the diagnostic key and if
aoqi@0:              * all diagnostic arguments are matches by corresponding sub-templates.
aoqi@0:              */
aoqi@0:             boolean matches(Object o) {
aoqi@0:                 JCDiagnostic d = (JCDiagnostic)o;
aoqi@0:                 Object[] args = d.getArgs();
aoqi@0:                 if (!d.getCode().matches(regex) ||
aoqi@0:                         subTemplates.length != d.getArgs().length) {
aoqi@0:                     return false;
aoqi@0:                 }
aoqi@0:                 for (int i = 0; i < args.length ; i++) {
aoqi@0:                     if (!subTemplates[i].matches(args[i])) {
aoqi@0:                         return false;
aoqi@0:                     }
aoqi@0:                 }
aoqi@0:                 return true;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         /** a dummy template that match any diagnostic argument */
aoqi@0:         static final Template skip = new Template("") {
aoqi@0:             @Override
aoqi@0:             boolean matches(Object d) {
aoqi@0:                 return true;
aoqi@0:             }
aoqi@0:         };
aoqi@0: 
aoqi@0:         /** rewriter map used for method resolution simplification */
aoqi@0:         static final Map<Template, DiagnosticRewriter> rewriters =
aoqi@0:                 new LinkedHashMap<Template, DiagnosticRewriter>();
aoqi@0: 
aoqi@0:         static {
aoqi@0:             String argMismatchRegex = MethodCheckDiag.ARG_MISMATCH.regex();
aoqi@0:             rewriters.put(new Template(argMismatchRegex, skip),
aoqi@0:                     new DiagnosticRewriter() {
aoqi@0:                 @Override
aoqi@0:                 public JCDiagnostic rewriteDiagnostic(JCDiagnostic.Factory diags,
aoqi@0:                         DiagnosticPosition preferedPos, DiagnosticSource preferredSource,
aoqi@0:                         DiagnosticType preferredKind, JCDiagnostic d) {
aoqi@0:                     JCDiagnostic cause = (JCDiagnostic)d.getArgs()[0];
sadayapalam@3005:                     DiagnosticPosition pos = d.getDiagnosticPosition();
sadayapalam@3005:                     if (pos == null) {
sadayapalam@3005:                         pos = preferedPos;
sadayapalam@3005:                     }
sadayapalam@3005:                     return diags.create(preferredKind, preferredSource, pos,
aoqi@0:                             "prob.found.req", cause);
aoqi@0:                 }
aoqi@0:             });
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     enum MethodResolutionPhase {
aoqi@0:         BASIC(false, false),
aoqi@0:         BOX(true, false),
aoqi@0:         VARARITY(true, true) {
aoqi@0:             @Override
aoqi@0:             public Symbol mergeResults(Symbol bestSoFar, Symbol sym) {
mcimadamore@2559:                 //Check invariants (see {@code LookupHelper.shouldStop})
mcimadamore@2559:                 Assert.check(bestSoFar.kind >= ERRONEOUS && bestSoFar.kind != AMBIGUOUS);
mcimadamore@2559:                 if (sym.kind < ERRONEOUS) {
mcimadamore@2559:                     //varargs resolution successful
mcimadamore@2559:                     return sym;
mcimadamore@2559:                 } else {
mcimadamore@2559:                     //pick best error
mcimadamore@2559:                     switch (bestSoFar.kind) {
mcimadamore@2559:                         case WRONG_MTH:
mcimadamore@2559:                         case WRONG_MTHS:
mcimadamore@2559:                             //Override previous errors if they were caused by argument mismatch.
mcimadamore@2559:                             //This generally means preferring current symbols - but we need to pay
mcimadamore@2559:                             //attention to the fact that the varargs lookup returns 'less' candidates
mcimadamore@2559:                             //than the previous rounds, and adjust that accordingly.
mcimadamore@2559:                             switch (sym.kind) {
mcimadamore@2559:                                 case WRONG_MTH:
mcimadamore@2559:                                     //if the previous round matched more than one method, return that
mcimadamore@2559:                                     //result instead
mcimadamore@2559:                                     return bestSoFar.kind == WRONG_MTHS ?
mcimadamore@2559:                                             bestSoFar : sym;
mcimadamore@2559:                                 case ABSENT_MTH:
mcimadamore@2559:                                     //do not override erroneous symbol if the arity lookup did not
mcimadamore@2559:                                     //match any method
mcimadamore@2559:                                     return bestSoFar;
mcimadamore@2559:                                 case WRONG_MTHS:
mcimadamore@2559:                                 default:
mcimadamore@2559:                                     //safe to override
mcimadamore@2559:                                     return sym;
mcimadamore@2559:                             }
mcimadamore@2559:                         default:
mcimadamore@2559:                             //otherwise, return first error
mcimadamore@2559:                             return bestSoFar;
mcimadamore@2559:                     }
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         };
aoqi@0: 
aoqi@0:         final boolean isBoxingRequired;
aoqi@0:         final boolean isVarargsRequired;
aoqi@0: 
aoqi@0:         MethodResolutionPhase(boolean isBoxingRequired, boolean isVarargsRequired) {
aoqi@0:            this.isBoxingRequired = isBoxingRequired;
aoqi@0:            this.isVarargsRequired = isVarargsRequired;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean isBoxingRequired() {
aoqi@0:             return isBoxingRequired;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean isVarargsRequired() {
aoqi@0:             return isVarargsRequired;
aoqi@0:         }
aoqi@0: 
aoqi@0:         public boolean isApplicable(boolean boxingEnabled, boolean varargsEnabled) {
aoqi@0:             return (varargsEnabled || !isVarargsRequired) &&
aoqi@0:                    (boxingEnabled || !isBoxingRequired);
aoqi@0:         }
aoqi@0: 
aoqi@0:         public Symbol mergeResults(Symbol prev, Symbol sym) {
aoqi@0:             return sym;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     final List<MethodResolutionPhase> methodResolutionSteps = List.of(BASIC, BOX, VARARITY);
aoqi@0: 
aoqi@0:     /**
aoqi@0:      * A resolution context is used to keep track of intermediate results of
aoqi@0:      * overload resolution, such as list of method that are not applicable
aoqi@0:      * (used to generate more precise diagnostics) and so on. Resolution contexts
aoqi@0:      * can be nested - this means that when each overload resolution routine should
aoqi@0:      * work within the resolution context it created.
aoqi@0:      */
aoqi@0:     class MethodResolutionContext {
aoqi@0: 
aoqi@0:         private List<Candidate> candidates = List.nil();
aoqi@0: 
aoqi@0:         MethodResolutionPhase step = null;
aoqi@0: 
aoqi@0:         MethodCheck methodCheck = resolveMethodCheck;
aoqi@0: 
aoqi@0:         private boolean internalResolution = false;
aoqi@0:         private DeferredAttr.AttrMode attrMode = DeferredAttr.AttrMode.SPECULATIVE;
aoqi@0: 
aoqi@0:         void addInapplicableCandidate(Symbol sym, JCDiagnostic details) {
aoqi@0:             Candidate c = new Candidate(currentResolutionContext.step, sym, details, null);
aoqi@0:             candidates = candidates.append(c);
aoqi@0:         }
aoqi@0: 
aoqi@0:         void addApplicableCandidate(Symbol sym, Type mtype) {
aoqi@0:             Candidate c = new Candidate(currentResolutionContext.step, sym, null, mtype);
aoqi@0:             candidates = candidates.append(c);
aoqi@0:         }
aoqi@0: 
aoqi@0:         DeferredAttrContext deferredAttrContext(Symbol sym, InferenceContext inferenceContext, ResultInfo pendingResult, Warner warn) {
aoqi@0:             DeferredAttrContext parent = (pendingResult == null)
aoqi@0:                 ? deferredAttr.emptyDeferredAttrContext
aoqi@0:                 : pendingResult.checkContext.deferredAttrContext();
aoqi@0:             return deferredAttr.new DeferredAttrContext(attrMode, sym, step,
aoqi@0:                     inferenceContext, parent, warn);
aoqi@0:         }
aoqi@0: 
aoqi@0:         /**
aoqi@0:          * This class represents an overload resolution candidate. There are two
aoqi@0:          * kinds of candidates: applicable methods and inapplicable methods;
aoqi@0:          * applicable methods have a pointer to the instantiated method type,
aoqi@0:          * while inapplicable candidates contain further details about the
aoqi@0:          * reason why the method has been considered inapplicable.
aoqi@0:          */
aoqi@0:         @SuppressWarnings("overrides")
aoqi@0:         class Candidate {
aoqi@0: 
aoqi@0:             final MethodResolutionPhase step;
aoqi@0:             final Symbol sym;
aoqi@0:             final JCDiagnostic details;
aoqi@0:             final Type mtype;
aoqi@0: 
aoqi@0:             private Candidate(MethodResolutionPhase step, Symbol sym, JCDiagnostic details, Type mtype) {
aoqi@0:                 this.step = step;
aoqi@0:                 this.sym = sym;
aoqi@0:                 this.details = details;
aoqi@0:                 this.mtype = mtype;
aoqi@0:             }
aoqi@0: 
aoqi@0:             @Override
aoqi@0:             public boolean equals(Object o) {
aoqi@0:                 if (o instanceof Candidate) {
aoqi@0:                     Symbol s1 = this.sym;
aoqi@0:                     Symbol s2 = ((Candidate)o).sym;
aoqi@0:                     if  ((s1 != s2 &&
aoqi@0:                             (s1.overrides(s2, s1.owner.type.tsym, types, false) ||
aoqi@0:                             (s2.overrides(s1, s2.owner.type.tsym, types, false)))) ||
aoqi@0:                             ((s1.isConstructor() || s2.isConstructor()) && s1.owner != s2.owner))
aoqi@0:                         return true;
aoqi@0:                 }
aoqi@0:                 return false;
aoqi@0:             }
aoqi@0: 
aoqi@0:             boolean isApplicable() {
aoqi@0:                 return mtype != null;
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         DeferredAttr.AttrMode attrMode() {
aoqi@0:             return attrMode;
aoqi@0:         }
aoqi@0: 
aoqi@0:         boolean internal() {
aoqi@0:             return internalResolution;
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     MethodResolutionContext currentResolutionContext = null;
aoqi@0: }