7192246: Add type-checking support for default methods

Summary: Add type-checking support for default methods as per Featherweight-Defender document
Reviewed-by: jjg, dlsmith

src/share/classes/com/sun/tools/javac/code/Flags.java

@@ -67,7 +67,6 @@ public class Flags {
         if ((mask&NATIVE) != 0) flags.add(Flag.NATIVE);
         if ((mask&INTERFACE) != 0) flags.add(Flag.INTERFACE);
         if ((mask&ABSTRACT) != 0) flags.add(Flag.ABSTRACT);
-        if ((mask&DEFAULT) != 0) flags.add(Flag.DEFAULT);
         if ((mask&STRICTFP) != 0) flags.add(Flag.STRICTFP);
         if ((mask&BRIDGE) != 0) flags.add(Flag.BRIDGE);
         if ((mask&SYNTHETIC) != 0) flags.add(Flag.SYNTHETIC);

src/share/classes/com/sun/tools/javac/code/Source.java

@@ -206,6 +206,9 @@ public enum Source {
     public boolean allowDefaultMethods() {
         return compareTo(JDK1_8) >= 0;
     }
+    public boolean allowStrictMethodClashCheck() {
+        return compareTo(JDK1_8) >= 0;
+    }
     public boolean allowEffectivelyFinalInInnerClasses() {
         return compareTo(JDK1_8) >= 0;
     }

src/share/classes/com/sun/tools/javac/code/Symbol.java

@@ -1192,9 +1192,9 @@ public abstract class Symbol implements Element {
 
             // check for an inherited implementation
             if ((flags() & ABSTRACT) != 0 ||
-                (other.flags() & ABSTRACT) == 0 ||
-                !other.isOverridableIn(origin) ||
-                !this.isMemberOf(origin, types))
+                    (other.flags() & ABSTRACT) == 0 ||
+                    !other.isOverridableIn(origin) ||
+                    !this.isMemberOf(origin, types))
                 return false;
 
             // assert types.asSuper(origin.type, other.owner) != null;

src/share/classes/com/sun/tools/javac/code/Types.java

@@ -75,6 +75,7 @@ public class Types {
     final boolean allowBoxing;
     final boolean allowCovariantReturns;
     final boolean allowObjectToPrimitiveCast;
+    final boolean allowDefaultMethods;
     final ClassReader reader;
     final Check chk;
     JCDiagnostic.Factory diags;
@@ -98,6 +99,7 @@ public class Types {
         allowBoxing = source.allowBoxing();
         allowCovariantReturns = source.allowCovariantReturns();
         allowObjectToPrimitiveCast = source.allowObjectToPrimitiveCast();
+        allowDefaultMethods = source.allowDefaultMethods();
         reader = ClassReader.instance(context);
         chk = Check.instance(context);
         capturedName = names.fromString("<captured wildcard>");
@@ -2146,6 +2148,13 @@ public class Types {
                 return List.nil();
             }
         };
+
+    public boolean isDirectSuperInterface(Type t, TypeSymbol tsym) {
+        for (Type t2 : interfaces(tsym.type)) {
+            if (isSameType(t, t2)) return true;
+        }
+        return false;
+    }
     // </editor-fold>
 
     // <editor-fold defaultstate="collapsed" desc="isDerivedRaw">
@@ -2310,6 +2319,10 @@ public class Types {
         return false;
     }
 
+    public boolean overridesObjectMethod(Symbol msym) {
+        return ((MethodSymbol)msym).implementation(syms.objectType.tsym, this, true) != null;
+    }
+
     // <editor-fold defaultstate="collapsed" desc="Determining method implementation in given site">
     class ImplementationCache {
 
@@ -2455,6 +2468,70 @@ public class Types {
     }
     // </editor-fold>
 
+
+    //where
+    public List<MethodSymbol> interfaceCandidates(Type site, MethodSymbol ms) {
+        return interfaceCandidates(site, ms, false);
+    }
+
+    public List<MethodSymbol> interfaceCandidates(Type site, MethodSymbol ms, boolean intfOnly) {
+        Filter<Symbol> filter = new MethodFilter(ms, site, intfOnly);
+        List<MethodSymbol> candidates = List.nil();
+        for (Symbol s : membersClosure(site, false).getElements(filter)) {
+            if (!site.tsym.isInterface() && !s.owner.isInterface()) {
+                return List.of((MethodSymbol)s);
+            } else if (!candidates.contains(s)) {
+                candidates = candidates.prepend((MethodSymbol)s);
+            }
+        }
+        return prune(candidates, ownerComparator);
+    }
+
+    public List<MethodSymbol> prune(List<MethodSymbol> methods, Comparator<MethodSymbol> cmp) {
+        ListBuffer<MethodSymbol> methodsMin = ListBuffer.lb();
+        for (MethodSymbol m1 : methods) {
+            boolean isMin_m1 = true;
+            for (MethodSymbol m2 : methods) {
+                if (m1 == m2) continue;
+                if (cmp.compare(m2, m1) < 0) {
+                    isMin_m1 = false;
+                    break;
+                }
+            }
+            if (isMin_m1)
+                methodsMin.append(m1);
+        }
+        return methodsMin.toList();
+    }
+
+    Comparator<MethodSymbol> ownerComparator = new Comparator<MethodSymbol>() {
+        public int compare(MethodSymbol s1, MethodSymbol s2) {
+            return s1.owner.isSubClass(s2.owner, Types.this) ? -1 : 1;
+        }
+    };
+    // where
+            private class MethodFilter implements Filter<Symbol> {
+
+                Symbol msym;
+                Type site;
+                boolean intfOnly;
+
+                MethodFilter(Symbol msym, Type site, boolean intfOnly) {
+                    this.msym = msym;
+                    this.site = site;
+                    this.intfOnly = intfOnly;
+                }
+
+                public boolean accepts(Symbol s) {
+                    return s.kind == Kinds.MTH &&
+                            (!intfOnly || s.owner.isInterface()) &&
+                            s.name == msym.name &&
+                            s.isInheritedIn(site.tsym, Types.this) &&
+                            overrideEquivalent(memberType(site, s), memberType(site, msym));
+                }
+            };
+    // </editor-fold>
+
     /**
      * Does t have the same arguments as s?  It is assumed that both
      * types are (possibly polymorphic) method types.  Monomorphic

src/share/classes/com/sun/tools/javac/comp/Attr.java

@@ -135,6 +135,7 @@ public class Attr extends JCTree.Visitor {
         allowStringsInSwitch = source.allowStringsInSwitch();
         allowPoly = source.allowPoly() && options.isSet("allowPoly");
         allowLambda = source.allowLambda();
+        allowDefaultMethods = source.allowDefaultMethods();
         sourceName = source.name;
         relax = (options.isSet("-retrofit") ||
                  options.isSet("-relax"));
@@ -178,6 +179,10 @@ public class Attr extends JCTree.Visitor {
      */
     boolean allowCovariantReturns;
 
+    /** Switch: support default methods ?
+     */
+    boolean allowDefaultMethods;
+
     /** Switch: support lambda expressions ?
      */
     boolean allowLambda;
@@ -898,6 +903,10 @@ public class Attr extends JCTree.Visitor {
 
             localEnv.info.lint = lint;
 
+            if (isDefaultMethod && types.overridesObjectMethod(m)) {
+                log.error(tree, "default.overrides.object.member", m.name, Kinds.kindName(m.location()), m.location());
+            }
+
             // Enter all type parameters into the local method scope.
             for (List<JCTypeParameter> l = tree.typarams; l.nonEmpty(); l = l.tail)
                 localEnv.info.scope.enterIfAbsent(l.head.type.tsym);
@@ -961,10 +970,12 @@ public class Attr extends JCTree.Visitor {
                         log.error(tree.pos(),
                                   "default.allowed.in.intf.annotation.member");
                 }
-            } else if ((owner.flags() & INTERFACE) != 0 && !isDefaultMethod) {
-                log.error(tree.body.pos(), "intf.meth.cant.have.body");
-            } else if ((tree.mods.flags & ABSTRACT) != 0) {
-                log.error(tree.pos(), "abstract.meth.cant.have.body");
+            } else if ((tree.sym.flags() & ABSTRACT) != 0 && !isDefaultMethod) {
+                if ((owner.flags() & INTERFACE) != 0) {
+                    log.error(tree.body.pos(), "intf.meth.cant.have.body");
+                } else {
+                    log.error(tree.pos(), "abstract.meth.cant.have.body");
+                }
             } else if ((tree.mods.flags & NATIVE) != 0) {
                 log.error(tree.pos(), "native.meth.cant.have.body");
             } else {
@@ -3281,6 +3292,23 @@ public class Attr extends JCTree.Visitor {
             }
         }
 
+        if (env.info.defaultSuperCallSite != null &&
+                !types.interfaceCandidates(env.enclClass.type, (MethodSymbol)sym, true).contains(sym)) {
+            Symbol ovSym = null;
+            for (MethodSymbol msym : types.interfaceCandidates(env.enclClass.type, (MethodSymbol)sym, true)) {
+                if (msym.overrides(sym, msym.enclClass(), types, true)) {
+                    for (Type i : types.interfaces(env.enclClass.type)) {
+                        if (i.tsym.isSubClass(msym.owner, types)) {
+                            ovSym = i.tsym;
+                            break;
+                        }
+                    }
+                }
+            }
+            log.error(env.tree.pos(), "illegal.default.super.call", env.info.defaultSuperCallSite,
+                    diags.fragment("overridden.default", sym, ovSym));
+        }
+
         // Compute the identifier's instantiated type.
         // For methods, we need to compute the instance type by
         // Resolve.instantiate from the symbol's type as well as
@@ -3700,6 +3728,9 @@ public class Attr extends JCTree.Visitor {
             // are compatible (i.e. no two define methods with same arguments
             // yet different return types).  (JLS 8.4.6.3)
             chk.checkCompatibleSupertypes(tree.pos(), c.type);
+            if (allowDefaultMethods) {
+                chk.checkDefaultMethodClashes(tree.pos(), c.type);
+            }
         }
 
         // Check that class does not import the same parameterized interface

src/share/classes/com/sun/tools/javac/comp/AttrContext.java

@@ -72,6 +72,10 @@ public class AttrContext {
      */
     Attr.ResultInfo returnResult = null;
 
+    /** Symbol corresponding to the site of a qualified default super call
+     */
+    Type defaultSuperCallSite = null;
+
     /** Duplicate this context, replacing scope field and copying all others.
      */
     AttrContext dup(Scope scope) {
@@ -84,6 +88,7 @@ public class AttrContext {
         info.lint = lint;
         info.enclVar = enclVar;
         info.returnResult = returnResult;
+        info.defaultSuperCallSite = defaultSuperCallSite;
         return info;
     }
 

src/share/classes/com/sun/tools/javac/comp/Check.java

@@ -119,6 +119,9 @@ public class Check {
         allowAnnotations = source.allowAnnotations();
         allowCovariantReturns = source.allowCovariantReturns();
         allowSimplifiedVarargs = source.allowSimplifiedVarargs();
+        allowDefaultMethods = source.allowDefaultMethods();
+        allowStrictMethodClashCheck = source.allowStrictMethodClashCheck() &&
+                options.isSet("strictMethodClashCheck"); //pre-lambda guard
         complexInference = options.isSet("complexinference");
         warnOnSyntheticConflicts = options.isSet("warnOnSyntheticConflicts");
         suppressAbortOnBadClassFile = options.isSet("suppressAbortOnBadClassFile");
@@ -162,6 +165,14 @@ public class Check {
      */
     boolean allowSimplifiedVarargs;
 
+    /** Switch: default methods enabled?
+     */
+    boolean allowDefaultMethods;
+
+    /** Switch: should unrelated return types trigger a method clash?
+     */
+    boolean allowStrictMethodClashCheck;
+
     /** Switch: -complexinference option set?
      */
     boolean complexInference;
@@ -1114,7 +1125,7 @@ public class Check {
             }  else if ((sym.owner.flags_field & INTERFACE) != 0) {
                 if ((flags & DEFAULT) != 0) {
                     mask = InterfaceDefaultMethodMask;
-                    implicit = PUBLIC;
+                    implicit = PUBLIC | ABSTRACT;
                 } else {
                     mask = implicit = InterfaceMethodFlags;
                 }
@@ -2047,11 +2058,21 @@ public class Check {
                      undef == null && e != null;
                      e = e.sibling) {
                     if (e.sym.kind == MTH &&
-                        (e.sym.flags() & (ABSTRACT|IPROXY)) == ABSTRACT) {
+                        (e.sym.flags() & (ABSTRACT|IPROXY|DEFAULT)) == ABSTRACT) {
                         MethodSymbol absmeth = (MethodSymbol)e.sym;
                         MethodSymbol implmeth = absmeth.implementation(impl, types, true);
-                        if (implmeth == null || implmeth == absmeth)
+                        if (implmeth == null || implmeth == absmeth) {
+                            //look for default implementations
+                            if (allowDefaultMethods) {
+                                MethodSymbol prov = types.interfaceCandidates(impl.type, absmeth).head;
+                                if (prov != null && prov.overrides(absmeth, impl, types, true)) {
+                                    implmeth = prov;
+                                }
+                            }
+                        }
+                        if (implmeth == null || implmeth == absmeth) {
                             undef = absmeth;
+                        }
                     }
                 }
                 if (undef == null) {
@@ -2354,7 +2375,7 @@ public class Check {
                 if (m2 == m1) continue;
                 //if (i) the signature of 'sym' is not a subsignature of m1 (seen as
                 //a member of 'site') and (ii) m1 has the same erasure as m2, issue an error
-                if (!types.isSubSignature(sym.type, types.memberType(site, m2), false) &&
+                if (!types.isSubSignature(sym.type, types.memberType(site, m2), allowStrictMethodClashCheck) &&
                         types.hasSameArgs(m2.erasure(types), m1.erasure(types))) {
                     sym.flags_field |= CLASH;
                     String key = m1 == sym ?
@@ -2386,7 +2407,7 @@ public class Check {
         for (Symbol s : types.membersClosure(site, true).getElementsByName(sym.name, cf)) {
             //if (i) the signature of 'sym' is not a subsignature of m1 (seen as
             //a member of 'site') and (ii) 'sym' has the same erasure as m1, issue an error
-            if (!types.isSubSignature(sym.type, types.memberType(site, s), false) &&
+            if (!types.isSubSignature(sym.type, types.memberType(site, s), allowStrictMethodClashCheck) &&
                     types.hasSameArgs(s.erasure(types), sym.erasure(types))) {
                 log.error(pos,
                         "name.clash.same.erasure.no.hide",
@@ -2420,6 +2441,62 @@ public class Check {
          }
      }
 
+    void checkDefaultMethodClashes(DiagnosticPosition pos, Type site) {
+        DefaultMethodClashFilter dcf = new DefaultMethodClashFilter(site);
+        for (Symbol m : types.membersClosure(site, false).getElements(dcf)) {
+            Assert.check(m.kind == MTH);
+            List<MethodSymbol> prov = types.interfaceCandidates(site, (MethodSymbol)m);
+            if (prov.size() > 1) {
+                ListBuffer<Symbol> abstracts = ListBuffer.lb();
+                ListBuffer<Symbol> defaults = ListBuffer.lb();
+                for (MethodSymbol provSym : prov) {
+                    if ((provSym.flags() & DEFAULT) != 0) {
+                        defaults = defaults.append(provSym);
+                    } else if ((provSym.flags() & ABSTRACT) != 0) {
+                        abstracts = abstracts.append(provSym);
+                    }
+                    if (defaults.nonEmpty() && defaults.size() + abstracts.size() >= 2) {
+                        //strong semantics - issue an error if two sibling interfaces
+                        //have two override-equivalent defaults - or if one is abstract
+                        //and the other is default
+                        String errKey;
+                        Symbol s1 = defaults.first();
+                        Symbol s2;
+                        if (defaults.size() > 1) {
+                            errKey = "types.incompatible.unrelated.defaults";
+                            s2 = defaults.toList().tail.head;
+                        } else {
+                            errKey = "types.incompatible.abstract.default";
+                            s2 = abstracts.first();
+                        }
+                        log.error(pos, errKey,
+                                Kinds.kindName(site.tsym), site,
+                                m.name, types.memberType(site, m).getParameterTypes(),
+                                s1.location(), s2.location());
+                        break;
+                    }
+                }
+            }
+        }
+    }
+
+    //where
+     private class DefaultMethodClashFilter implements Filter<Symbol> {
+
+         Type site;
+
+         DefaultMethodClashFilter(Type site) {
+             this.site = site;
+         }
+
+         public boolean accepts(Symbol s) {
+             return s.kind == MTH &&
+                     (s.flags() & DEFAULT) != 0 &&
+                     s.isInheritedIn(site.tsym, types) &&
+                     !s.isConstructor();
+         }
+     }
+
     /** Report a conflict between a user symbol and a synthetic symbol.
      */
     private void syntheticError(DiagnosticPosition pos, Symbol sym) {

src/share/classes/com/sun/tools/javac/comp/Lower.java

@@ -3631,15 +3631,26 @@ public class Lower extends TreeTranslator {
 
     public void visitSelect(JCFieldAccess tree) {
         // need to special case-access of the form C.super.x
-        // these will always need an access method.
+        // these will always need an access method, unless C
+        // is a default interface subclassed by the current class.
         boolean qualifiedSuperAccess =
             tree.selected.hasTag(SELECT) &&
-            TreeInfo.name(tree.selected) == names._super;
+            TreeInfo.name(tree.selected) == names._super &&
+            !types.isDirectSuperInterface(((JCFieldAccess)tree.selected).selected.type, currentClass);
         tree.selected = translate(tree.selected);
-        if (tree.name == names._class)
+        if (tree.name == names._class) {
             result = classOf(tree.selected);
-        else if (tree.name == names._this || tree.name == names._super)
+        }
+        else if (tree.name == names._super &&
+                types.isDirectSuperInterface(tree.selected.type, currentClass)) {
+            //default super call!! Not a classic qualified super call
+            TypeSymbol supSym = tree.selected.type.tsym;
+            Assert.checkNonNull(types.asSuper(currentClass.type, supSym));
+            result = tree;
+        }
+        else if (tree.name == names._this || tree.name == names._super) {
             result = makeThis(tree.pos(), tree.selected.type.tsym);
+        }
         else
             result = access(tree.sym, tree, enclOp, qualifiedSuperAccess);
     }

src/share/classes/com/sun/tools/javac/comp/MemberEnter.java

@@ -560,6 +560,12 @@ public class MemberEnter extends JCTree.Visitor implements Completer {
         MethodSymbol m = new MethodSymbol(0, tree.name, null, enclScope.owner);
         m.flags_field = chk.checkFlags(tree.pos(), tree.mods.flags, m, tree);
         tree.sym = m;
+
+        //if this is a default method, add the DEFAULT flag to the enclosing interface
+        if ((tree.mods.flags & DEFAULT) != 0) {
+            m.enclClass().flags_field |= DEFAULT;
+        }
+
         Env<AttrContext> localEnv = methodEnv(tree, env);
 
         DeferredLintHandler prevLintHandler =
@@ -677,7 +683,7 @@ public class MemberEnter extends JCTree.Visitor implements Completer {
             localEnv.info.scope.owner = tree.sym;
         }
         if ((tree.mods.flags & STATIC) != 0 ||
-            (env.enclClass.sym.flags() & INTERFACE) != 0)
+                ((env.enclClass.sym.flags() & INTERFACE) != 0 && env.enclMethod == null))
             localEnv.info.staticLevel++;
         return localEnv;
     }
@@ -1001,20 +1007,19 @@ public class MemberEnter extends JCTree.Visitor implements Completer {
                 }
             }
 
-            // If this is a class, enter symbols for this and super into
-            // current scope.
-            if ((c.flags_field & INTERFACE) == 0) {
-                VarSymbol thisSym =
-                    new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
-                thisSym.pos = Position.FIRSTPOS;
-                env.info.scope.enter(thisSym);
-                if (ct.supertype_field.hasTag(CLASS)) {
-                    VarSymbol superSym =
-                        new VarSymbol(FINAL | HASINIT, names._super,
-                                      ct.supertype_field, c);
-                    superSym.pos = Position.FIRSTPOS;
-                    env.info.scope.enter(superSym);
-                }
+            // enter symbols for 'this' into current scope.
+            VarSymbol thisSym =
+                new VarSymbol(FINAL | HASINIT, names._this, c.type, c);
+            thisSym.pos = Position.FIRSTPOS;
+            env.info.scope.enter(thisSym);
+            // if this is a class, enter symbol for 'super' into current scope.
+            if ((c.flags_field & INTERFACE) == 0 &&
+                    ct.supertype_field.hasTag(CLASS)) {
+                VarSymbol superSym =
+                    new VarSymbol(FINAL | HASINIT, names._super,
+                                  ct.supertype_field, c);
+                superSym.pos = Position.FIRSTPOS;
+                env.info.scope.enter(superSym);
             }
 
             // check that no package exists with same fully qualified name,

src/share/classes/com/sun/tools/javac/comp/Resolve.java

@@ -52,6 +52,7 @@ import java.util.EnumMap;
 import java.util.EnumSet;
 import java.util.Iterator;
 import java.util.Map;
+import java.util.Set;
 
 import javax.lang.model.element.ElementVisitor;
 
@@ -88,6 +89,7 @@ public class Resolve {
     public final boolean boxingEnabled; // = source.allowBoxing();
     public final boolean varargsEnabled; // = source.allowVarargs();
     public final boolean allowMethodHandles;
+    public final boolean allowDefaultMethods;
     private final boolean debugResolve;
     final EnumSet<VerboseResolutionMode> verboseResolutionMode;
 
@@ -122,6 +124,7 @@ public class Resolve {
         verboseResolutionMode = VerboseResolutionMode.getVerboseResolutionMode(options);
         Target target = Target.instance(context);
         allowMethodHandles = target.hasMethodHandles();
+        allowDefaultMethods = source.allowDefaultMethods();
         polymorphicSignatureScope = new Scope(syms.noSymbol);
 
         inapplicableMethodException = new InapplicableMethodException(diags);
@@ -1327,6 +1330,42 @@ public class Resolve {
         }
     }
 
+    Symbol lookupMethod(Env<AttrContext> env,
+            Type site,
+            Name name,
+            List<Type> argtypes,
+            List<Type> typeargtypes,
+            Scope sc,
+            Symbol bestSoFar,
+            boolean allowBoxing,
+            boolean useVarargs,
+            boolean operator,
+            boolean abstractok) {
+        for (Symbol s : sc.getElementsByName(name, new LookupFilter(abstractok))) {
+            bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
+                    bestSoFar, allowBoxing, useVarargs, operator);
+        }
+        return bestSoFar;
+    }
+    //where
+        class LookupFilter implements Filter<Symbol> {
+
+            boolean abstractOk;
+
+            LookupFilter(boolean abstractOk) {
+                this.abstractOk = abstractOk;
+            }
+
+            public boolean accepts(Symbol s) {
+                long flags = s.flags();
+                return s.kind == MTH &&
+                        (flags & SYNTHETIC) == 0 &&
+                        (abstractOk ||
+                        (flags & DEFAULT) != 0 ||
+                        (flags & ABSTRACT) == 0);
+            }
+        };
+
     /** Find best qualified method matching given name, type and value
      *  arguments.
      *  @param env       The current environment.
@@ -1371,49 +1410,76 @@ public class Resolve {
                               boolean allowBoxing,
                               boolean useVarargs,
                               boolean operator) {
-        boolean abstractOk = true;
-        List<Type> itypes = List.nil();
+        @SuppressWarnings({"unchecked","rawtypes"})
+        List<Type>[] itypes = (List<Type>[])new List[] { List.<Type>nil(), List.<Type>nil() };
+        InterfaceLookupPhase iphase = InterfaceLookupPhase.ABSTRACT_OK;
         for (TypeSymbol s : superclasses(intype)) {
             bestSoFar = lookupMethod(env, site, name, argtypes, typeargtypes,
                     s.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
-            //We should not look for abstract methods if receiver is a concrete class
-            //(as concrete classes are expected to implement all abstracts coming
-            //from superinterfaces)
-            abstractOk &= (s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0;
-            if (abstractOk) {
+            if (name == names.init) return bestSoFar;
+            iphase = (iphase == null) ? null : iphase.update(s, this);
+            if (iphase != null) {
                 for (Type itype : types.interfaces(s.type)) {
-                    itypes = types.union(types.closure(itype), itypes);
+                    itypes[iphase.ordinal()] = types.union(types.closure(itype), itypes[iphase.ordinal()]);
                 }
             }
-            if (name == names.init) break;
         }
 
         Symbol concrete = bestSoFar.kind < ERR &&
                 (bestSoFar.flags() & ABSTRACT) == 0 ?
                 bestSoFar : methodNotFound;
 
-        if (name != names.init) {
+        for (InterfaceLookupPhase iphase2 : InterfaceLookupPhase.values()) {
+            if (iphase2 == InterfaceLookupPhase.DEFAULT_OK && !allowDefaultMethods) break;
             //keep searching for abstract methods
-            for (Type itype : itypes) {
+            for (Type itype : itypes[iphase2.ordinal()]) {
                 if (!itype.isInterface()) continue; //skip j.l.Object (included by Types.closure())
+                if (iphase2 == InterfaceLookupPhase.DEFAULT_OK &&
+                        (itype.tsym.flags() & DEFAULT) == 0) continue;
                 bestSoFar = lookupMethod(env, site, name, argtypes, typeargtypes,
-                    itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
-                    if (concrete != bestSoFar &&
-                            concrete.kind < ERR  && bestSoFar.kind < ERR &&
-                            types.isSubSignature(concrete.type, bestSoFar.type)) {
-                        //this is an hack - as javac does not do full membership checks
-                        //most specific ends up comparing abstract methods that might have
-                        //been implemented by some concrete method in a subclass and,
-                        //because of raw override, it is possible for an abstract method
-                        //to be more specific than the concrete method - so we need
-                        //to explicitly call that out (see CR 6178365)
-                        bestSoFar = concrete;
-                    }
+                        itype.tsym.members(), bestSoFar, allowBoxing, useVarargs, operator, true);
+                if (concrete != bestSoFar &&
+                        concrete.kind < ERR  && bestSoFar.kind < ERR &&
+                        types.isSubSignature(concrete.type, bestSoFar.type)) {
+                    //this is an hack - as javac does not do full membership checks
+                    //most specific ends up comparing abstract methods that might have
+                    //been implemented by some concrete method in a subclass and,
+                    //because of raw override, it is possible for an abstract method
+                    //to be more specific than the concrete method - so we need
+                    //to explicitly call that out (see CR 6178365)
+                    bestSoFar = concrete;
+                }
             }
         }
         return bestSoFar;
     }
 
+    enum InterfaceLookupPhase {
+        ABSTRACT_OK() {
+            @Override
+            InterfaceLookupPhase update(Symbol s, Resolve rs) {
+                //We should not look for abstract methods if receiver is a concrete class
+                //(as concrete classes are expected to implement all abstracts coming
+                //from superinterfaces)
+                if ((s.flags() & (ABSTRACT | INTERFACE | ENUM)) != 0) {
+                    return this;
+                } else if (rs.allowDefaultMethods) {
+                    return DEFAULT_OK;
+                } else {
+                    return null;
+                }
+            }
+        },
+        DEFAULT_OK() {
+            @Override
+            InterfaceLookupPhase update(Symbol s, Resolve rs) {
+                return this;
+            }
+        };
+
+        abstract InterfaceLookupPhase update(Symbol s, Resolve rs);
+    }
+
     /**
      * Return an Iterable object to scan the superclasses of a given type.
      * It's crucial that the scan is done lazily, as we don't want to accidentally
@@ -1467,34 +1533,6 @@ public class Resolve {
         };
     }
 
-    /**
-     * Lookup a method with given name and argument types in a given scope
-     */
-    Symbol lookupMethod(Env<AttrContext> env,
-            Type site,
-            Name name,
-            List<Type> argtypes,
-            List<Type> typeargtypes,
-            Scope sc,
-            Symbol bestSoFar,
-            boolean allowBoxing,
-            boolean useVarargs,
-            boolean operator,
-            boolean abstractok) {
-        for (Symbol s : sc.getElementsByName(name, lookupFilter)) {
-            bestSoFar = selectBest(env, site, argtypes, typeargtypes, s,
-                    bestSoFar, allowBoxing, useVarargs, operator);
-        }
-        return bestSoFar;
-    }
-    //where
-        Filter<Symbol> lookupFilter = new Filter<Symbol>() {
-            public boolean accepts(Symbol s) {
-                return s.kind == MTH &&
-                        (s.flags() & SYNTHETIC) == 0;
-            }
-        };
-
     /** Find unqualified method matching given name, type and value arguments.
      *  @param env       The current environment.
      *  @param name      The method's name.
@@ -1920,7 +1958,7 @@ public class Resolve {
     /** Check that sym is not an abstract method.
      */
     void checkNonAbstract(DiagnosticPosition pos, Symbol sym) {
-        if ((sym.flags() & ABSTRACT) != 0)
+        if ((sym.flags() & ABSTRACT) != 0 && (sym.flags() & DEFAULT) == 0)
             log.error(pos, "abstract.cant.be.accessed.directly",
                       kindName(sym), sym, sym.location());
     }
@@ -2744,9 +2782,47 @@ public class Resolve {
             if ((env1.enclClass.sym.flags() & STATIC) != 0) staticOnly = true;
             env1 = env1.outer;
         }
+        if (allowDefaultMethods && c.isInterface() &&
+                name == names._super && !isStatic(env) &&
+                types.isDirectSuperInterface(c.type, env.enclClass.sym)) {
+            //this might be a default super call if one of the superinterfaces is 'c'
+            for (Type t : pruneInterfaces(env.enclClass.type)) {
+                if (t.tsym == c) {
+                    env.info.defaultSuperCallSite = t;
+                    return new VarSymbol(0, names._super,
+                            types.asSuper(env.enclClass.type, c), env.enclClass.sym);
+                }
+            }
+            //find a direct superinterface that is a subtype of 'c'
+            for (Type i : types.interfaces(env.enclClass.type)) {
+                if (i.tsym.isSubClass(c, types) && i.tsym != c) {
+                    log.error(pos, "illegal.default.super.call", c,
+                            diags.fragment("redundant.supertype", c, i));
+                    return syms.errSymbol;
+                }
+            }
+            Assert.error();
+        }
         log.error(pos, "not.encl.class", c);
         return syms.errSymbol;
     }
+    //where
+    private List<Type> pruneInterfaces(Type t) {
+        ListBuffer<Type> result = ListBuffer.lb();
+        for (Type t1 : types.interfaces(t)) {
+            boolean shouldAdd = true;
+            for (Type t2 : types.interfaces(t)) {
+                if (t1 != t2 && types.isSubtypeNoCapture(t2, t1)) {
+                    shouldAdd = false;
+                }
+            }
+            if (shouldAdd) {
+                result.append(t1);
+            }
+        }
+        return result.toList();
+    }
+
 
     /**
      * Resolve `c.this' for an enclosing class c that contains the

src/share/classes/com/sun/tools/javac/jvm/ClassReader.java

@@ -115,6 +115,9 @@ public class ClassReader implements Completer {
      */
     boolean lintClassfile;
 
+    /** Switch: allow default methods
+     */
+    boolean allowDefaultMethods;
 
     /** Switch: preserve parameter names from the variable table.
      */
@@ -279,6 +282,7 @@ public class ClassReader implements Completer {
         allowVarargs     = source.allowVarargs();
         allowAnnotations = source.allowAnnotations();
         allowSimplifiedVarargs = source.allowSimplifiedVarargs();
+        allowDefaultMethods = source.allowDefaultMethods();
         saveParameterNames = options.isSet("save-parameter-names");
         cacheCompletionFailure = options.isUnset("dev");
         preferSource = "source".equals(options.get("-Xprefer"));
@@ -937,6 +941,18 @@ public class ClassReader implements Completer {
 
             new AttributeReader(names.Code, V45_3, MEMBER_ATTRIBUTE) {
                 protected void read(Symbol sym, int attrLen) {
+                    if (currentOwner.isInterface() &&
+                            (sym.flags_field & ABSTRACT) == 0 && !name.equals(names.clinit)) {
+                        if (majorVersion > Target.JDK1_8.majorVersion ||
+                                //todo replace with Target.Version when available
+                                (majorVersion == Target.JDK1_8.majorVersion && minorVersion >= Target.JDK1_8.minorVersion)) {
+                            currentOwner.flags_field |= DEFAULT;
+                            sym.flags_field |= DEFAULT | ABSTRACT;
+                        } else {
+                            //protect against ill-formed classfiles
+                            throw new CompletionFailure(currentOwner, "default method found in pre JDK 8 classfile");
+                        }
+                    }
                     if (readAllOfClassFile || saveParameterNames)
                         ((MethodSymbol)sym).code = readCode(sym);
                     else

src/share/classes/com/sun/tools/javac/jvm/ClassWriter.java

@@ -1540,7 +1540,7 @@ public class ClassWriter extends ClassFile {
         List<Type> interfaces = types.interfaces(c.type);
         List<Type> typarams = c.type.getTypeArguments();
 
-        int flags = adjustFlags(c.flags());
+        int flags = adjustFlags(c.flags() & ~DEFAULT);
         if ((flags & PROTECTED) != 0) flags |= PUBLIC;
         flags = flags & ClassFlags & ~STRICTFP;
         if ((flags & INTERFACE) == 0) flags |= ACC_SUPER;
@@ -1676,6 +1676,8 @@ public class ClassWriter extends ClassFile {
             result |= ACC_BRIDGE;
         if ((flags & VARARGS) != 0  && target.useVarargsFlag())
             result |= ACC_VARARGS;
+        if ((flags & DEFAULT) != 0)
+            result &= ~ABSTRACT;
         return result;
     }
 

src/share/classes/com/sun/tools/javac/jvm/Items.java

@@ -523,7 +523,7 @@ public class Items {
         Item invoke() {
             MethodType mtype = (MethodType)member.externalType(types);
             int rescode = Code.typecode(mtype.restype);
-            if ((member.owner.flags() & Flags.INTERFACE) != 0) {
+            if ((member.owner.flags() & Flags.INTERFACE) != 0 && !nonvirtual) {
                 code.emitInvokeinterface(pool.put(member), mtype);
             } else if (nonvirtual) {
                 code.emitInvokespecial(pool.put(member), mtype);

src/share/classes/com/sun/tools/javac/resources/compiler.properties

@@ -574,7 +574,7 @@ compiler.err.intf.expected.here=\
     interface expected here
 
 compiler.err.intf.meth.cant.have.body=\
-    interface methods cannot have body
+    interface abstract methods cannot have body
 
 compiler.err.invalid.annotation.member.type=\
     invalid type for annotation member
@@ -941,6 +941,31 @@ compiler.err.type.var.more.than.once.in.result=\
 compiler.err.types.incompatible.diff.ret=\
     types {0} and {1} are incompatible; both define {2}, but with unrelated return types
 
+# 0: kind, 1: type, 2: name, 3: list of type, 4: symbol, 5: symbol
+compiler.err.types.incompatible.unrelated.defaults=\
+    {0} {1} inherits unrelated defaults for {2}({3}) from types {4} and {5}
+
+# 0: kind, 1: type, 2: name, 3: list of type, 4: symbol, 5: symbol
+compiler.err.types.incompatible.abstract.default=\
+    {0} {1} inherits abstract and default for {2}({3}) from types {4} and {5}
+
+# 0: name, 1: kind, 2: symbol
+compiler.err.default.overrides.object.member=\
+    default method {0} in {1} {2} overrides a member of java.lang.Object
+
+# 0: type, 1: message segment
+compiler.err.illegal.default.super.call=\
+    bad type qualifier {0} in default super call\n\
+    {1}
+
+# 0: symbol, 1: type
+compiler.misc.overridden.default=\
+    method {0} is overridden in {2}
+
+# 0: symbol, 1: symbol
+compiler.misc.redundant.supertype=\
+    redundant interface {0} is extended by {1}
+
 compiler.err.unclosed.char.lit=\
     unclosed character literal
 

test/tools/javac/defaultMethods/ClassReaderTest/ClassReaderTest.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that default methods don't cause ClassReader to complete classes recursively
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods pkg/Foo.java
+ * @compile ClassReaderTest.java
+ */
+
+abstract class ClassReaderTest implements pkg.Foo {}

test/tools/javac/defaultMethods/ClassReaderTest/pkg/Foo.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package pkg;
+
+public interface Foo  {
+    default void m1() { Impl.m1(this); }
+    default void m2() { Impl.m2(this); }
+}
+
+class Impl {
+    static void m1(Foo f) { }
+    static void m2(Foo f) { }
+}

test/tools/javac/defaultMethods/Neg01.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary negative test for ambiguous defaults
+ * @compile/fail/ref=Neg01.out -XDallowDefaultMethods -XDrawDiagnostics Neg01.java
+ */
+
+class Neg01 {
+    interface IA { default int m() { return Neg01.m1(this); } }
+    interface IB { default int m() { return Neg01.m2(this); } }
+
+    static class A implements IA {}
+    static class B implements IB {}
+
+    static class AB implements IA, IB {}
+
+    static int m1(IA a) { return 0; }
+    static int m2(IB b) { return 0; }
+}

test/tools/javac/defaultMethods/Neg01.out

+Neg01.java:14:12: compiler.err.types.incompatible.unrelated.defaults: kindname.class, Neg01.AB, m, , Neg01.IA, Neg01.IB
+1 error

test/tools/javac/defaultMethods/Neg02.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that ill-formed MI hierarchies do not compile
+ * @compile/fail/ref=Neg02.out -XDallowDefaultMethods -XDrawDiagnostics Neg02.java
+ */
+
+class Neg02 {
+     interface A {
+         default void m() { Neg02.impl(this); }
+     }
+
+     interface B {
+         default void m() { Neg02.impl(this); }
+     }
+
+     static class X implements A, B { } //error
+
+     void test(X x) {
+         x.m();
+         ((A)x).m();
+         ((B)x).m();
+     }
+
+     static void impl(A a) { }
+     static void impl(B b) { }
+}

test/tools/javac/defaultMethods/Neg02.out

+Neg02.java:16:13: compiler.err.types.incompatible.unrelated.defaults: kindname.class, Neg02.X, m, , Neg02.A, Neg02.B
+1 error

test/tools/javac/defaultMethods/Neg03.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that re-abstraction works properly
+ * @compile/fail/ref=Neg03.out -XDallowDefaultMethods -XDrawDiagnostics Neg03.java
+ */
+
+class Neg03 {
+    interface A {
+        default void m() { Neg03.one(this); }
+    }
+
+    interface B {
+        default void m() { Neg03.two(this); }
+    }
+
+    interface C extends A, B {
+        default void m() { Neg03.one(this); }
+    }
+
+    static class X implements C, A { } //ok - ignore extraneous remix of A
+
+    interface D extends A, B {
+      void m();  // ok - m() is not reabstracted!
+    }
+
+    static class Y implements D, A { } // invalid - abstract D.m()
+
+    interface E extends A {
+        void m();  // reabstraction of m()
+    }
+
+    static class W implements D, E { } // invalid - abstracts D.m()/E.m()
+
+    static class Z implements D, A, B { } // invalid - abstract D.m()
+
+    static void one(Object a) {  }
+    static void two(Object a) {  }
+}

test/tools/javac/defaultMethods/Neg03.out

+Neg03.java:26:12: compiler.err.does.not.override.abstract: Neg03.Y, m(), Neg03.D
+Neg03.java:32:12: compiler.err.does.not.override.abstract: Neg03.W, m(), Neg03.D
+Neg03.java:34:12: compiler.err.does.not.override.abstract: Neg03.Z, m(), Neg03.D
+3 errors

test/tools/javac/defaultMethods/Neg04.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default method must have most specific return type
+ * @compile/fail/ref=Neg04.out -XDallowDefaultMethods -XDrawDiagnostics Neg04.java
+ */
+
+class Neg04 {
+    interface IA1 { Integer m(); }
+    interface IA2 extends IA1 { default Number m() { return Neg04.m(this); } } //error
+
+    abstract class C implements IA1, IA2 {}
+
+    static int m(IA2 a) { return 0; }
+}

test/tools/javac/defaultMethods/Neg04.out

+Neg04.java:9:48: compiler.err.override.incompatible.ret: (compiler.misc.clashes.with: m(), Neg04.IA2, m(), Neg04.IA1), java.lang.Number, java.lang.Integer
+1 error

test/tools/javac/defaultMethods/Neg05.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that abstract methods are compatible with inherited defaults
+ * @compile/fail/ref=Neg05.out -XDallowDefaultMethods -XDrawDiagnostics Neg05.java
+ */
+
+class Neg05 {
+    interface IA1 { default Number m() { return Neg05.m1(this); } }
+    interface IA2 extends IA1 { default Integer m() { return Neg05.m2(this); } }
+    interface IA3 extends IA2 { Number m(); } //error
+
+    static class C implements IA3{}
+
+    static int m1(IA1 a) { return 0; }
+    static int m2(IA2 b) { return 0; }
+}

test/tools/javac/defaultMethods/Neg05.out

+Neg05.java:10:40: compiler.err.override.incompatible.ret: (compiler.misc.clashes.with: m(), Neg05.IA3, m(), Neg05.IA2), java.lang.Number, java.lang.Integer
+Neg05.java:12:12: compiler.err.does.not.override.abstract: Neg05.C, m(), Neg05.IA3
+2 errors

test/tools/javac/defaultMethods/Neg06.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary flow analysis is not run on inlined default bodies
+ * @compile/fail/ref=Neg06.out -XDallowDefaultMethods -XDrawDiagnostics Neg06.java
+ */
+
+class Neg06 {
+
+    interface A {
+        default String m() { C.m(); }
+    }
+
+    static class C {
+        static String m() { return ""; }
+    }
+}

test/tools/javac/defaultMethods/Neg06.out

+Neg06.java:10:37: compiler.err.missing.ret.stmt
+1 error

test/tools/javac/defaultMethods/Neg07.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default overrides are properly type-checked
+ * @compile/fail/ref=Neg07.out -XDallowDefaultMethods -XDrawDiagnostics Neg07.java
+ */
+
+class Neg07 {
+    interface I {
+        default int m() { return 1; }
+    }
+
+    static class C1 {
+        public void m() { } //incompatible return
+    }
+
+    static class C2 extends C1 implements I { }
+
+    static class C3 implements I {
+        public void m() { } //incompatible return
+    }
+}

test/tools/javac/defaultMethods/Neg07.out

+Neg07.java:16:12: compiler.err.override.incompatible.ret: (compiler.misc.cant.implement: m(), Neg07.C1, m(), Neg07.I), void, int
+Neg07.java:19:21: compiler.err.override.incompatible.ret: (compiler.misc.cant.implement: m(), Neg07.C3, m(), Neg07.I), void, int
+2 errors

test/tools/javac/defaultMethods/Neg08.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default overrides are properly type-checked
+ * @compile/fail/ref=Neg08.out -XDallowDefaultMethods -XDrawDiagnostics Neg08.java
+ */
+class Neg08 {
+    interface I {
+        default void m() { }
+    }
+
+    static class C1 {
+        void m() { } //weaker modifier
+    }
+
+    static class C2 extends C1 implements I { }
+
+    static class C3 implements I {
+        void m() { } //weaker modifier
+    }
+}

test/tools/javac/defaultMethods/Neg08.out

+Neg08.java:15:12: compiler.err.override.weaker.access: (compiler.misc.cant.implement: m(), Neg08.C1, m(), Neg08.I), public
+Neg08.java:18:14: compiler.err.override.weaker.access: (compiler.misc.cant.implement: m(), Neg08.C3, m(), Neg08.I), public
+2 errors

test/tools/javac/defaultMethods/Neg09.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default overrides are properly type-checked
+ * @compile/fail/ref=Neg09.out -Werror -Xlint:unchecked -XDallowDefaultMethods -XDrawDiagnostics Neg09.java
+ */
+import java.util.List;
+
+class Neg09 {
+    interface I {
+        default List<String> m() { return null; }
+    }
+
+    static class C1 {
+        public List m() { return null; } //unchecked (return) override
+    }
+
+    static class C2 extends C1 implements I { }
+
+    static class C3 implements I {
+        public List m() { return null; } //unchecked (return) override
+    }
+}

test/tools/javac/defaultMethods/Neg09.out

+Neg09.java:17:12: compiler.warn.override.unchecked.ret: (compiler.misc.unchecked.implement: m(), Neg09.C1, m(), Neg09.I), java.util.List, java.util.List<java.lang.String>
+Neg09.java:20:21: compiler.warn.override.unchecked.ret: (compiler.misc.unchecked.implement: m(), Neg09.C3, m(), Neg09.I), java.util.List, java.util.List<java.lang.String>
+- compiler.err.warnings.and.werror
+1 error
+2 warnings

test/tools/javac/defaultMethods/Neg10.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default overrides are properly type-checked
+ * @compile/fail/ref=Neg10.out -Werror -Xlint:unchecked -XDallowDefaultMethods -XDrawDiagnostics Neg10.java
+ */
+class Neg10 {
+    interface I<X extends Exception> {
+        default void m() throws X { }
+    }
+
+    static class C1 {
+        public void m() throws Exception { } //unchecked (throws) override
+    }
+
+    static class C2<Z extends Exception> extends C1 implements I<Z> { }
+
+    static class C3<Z extends Exception> implements I<Z> {
+        public void m() throws Exception { } //unchecked (throws) override
+    }
+}

test/tools/javac/defaultMethods/Neg10.out

+Neg10.java:15:12: compiler.warn.override.unchecked.thrown: (compiler.misc.cant.implement: m(), Neg10.C1, m(), Neg10.I), java.lang.Exception
+Neg10.java:18:21: compiler.warn.override.unchecked.thrown: (compiler.misc.cant.implement: m(), Neg10.C3, m(), Neg10.I), java.lang.Exception
+- compiler.err.warnings.and.werror
+1 error
+2 warnings

test/tools/javac/defaultMethods/Neg11.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default overrides are properly type-checked
+ * @compile/fail/ref=Neg11.out -XDallowDefaultMethods -XDrawDiagnostics Neg11.java
+ */
+class Neg11 {
+    interface I {
+        default void m() { }
+    }
+
+    static class C1 {
+        public void m() throws Exception { } //bad throws
+    }
+
+    static class C2 extends C1 implements I { }
+
+    static class C3 implements I {
+        public void m() throws Exception { } //bad throws
+    }
+}

test/tools/javac/defaultMethods/Neg11.out

+Neg11.java:15:12: compiler.err.override.meth.doesnt.throw: (compiler.misc.cant.implement: m(), Neg11.C1, m(), Neg11.I), java.lang.Exception
+Neg11.java:18:21: compiler.err.override.meth.doesnt.throw: (compiler.misc.cant.implement: m(), Neg11.C3, m(), Neg11.I), java.lang.Exception
+2 errors

test/tools/javac/defaultMethods/Neg12.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that abstract methods are discarded in overload resolution diags
+ * @compile/fail/ref=Neg12.out -XDallowDefaultMethods -XDrawDiagnostics Neg12.java
+ */
+class Neg12 {
+
+    interface I1 {
+        default void m(String s) {};
+    }
+
+    interface I2 {
+        void m(String s);
+    }
+
+    static class B {
+        void m(Integer i) { }
+    }
+
+    static class C extends B implements I1 { }
+    static class D extends B implements I2 { }
+
+    void test(C c, D d) {
+        c.m();
+        d.m();
+    }
+}

test/tools/javac/defaultMethods/Neg12.out

+Neg12.java:21:12: compiler.err.does.not.override.abstract: Neg12.D, m(java.lang.String), Neg12.I2
+Neg12.java:24:10: compiler.err.cant.apply.symbols: kindname.method, m, ,{(compiler.misc.inapplicable.method: kindname.method, Neg12.B, m(java.lang.Integer), (compiler.misc.arg.length.mismatch)),(compiler.misc.inapplicable.method: kindname.method, Neg12.I1, m(java.lang.String), (compiler.misc.arg.length.mismatch))}
+Neg12.java:25:10: compiler.err.cant.apply.symbol: kindname.method, m, java.lang.Integer, compiler.misc.no.args, kindname.class, Neg12.B, (compiler.misc.arg.length.mismatch)
+3 errors

test/tools/javac/defaultMethods/Neg13.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that default method overriding object members are flagged as error
+ * @compile/fail/ref=Neg13.out -XDallowDefaultMethods -XDrawDiagnostics Neg13.java
+ */
+interface Neg13 {
+    default protected Object clone() { return null; } //protected not allowed here
+    default boolean equals(Object obj) { return false; }
+    default protected void finalize() { } //protected not allowed here
+    default Class<?> getClass() { return null; }
+    default int hashCode() { return 0; }
+    default void notify() { }
+    default void notifyAll() { }
+    default String toString() { return null; }
+    default void wait() { }
+    default void wait(long timeout) { }
+    default void wait(long timeout, int nanos) { }
+}

test/tools/javac/defaultMethods/Neg13.out

+Neg13.java:7:30: compiler.err.mod.not.allowed.here: protected
+Neg13.java:9:28: compiler.err.mod.not.allowed.here: protected
+Neg13.java:8:21: compiler.err.default.overrides.object.member: equals, kindname.interface, Neg13
+Neg13.java:10:22: compiler.err.override.meth: (compiler.misc.cant.override: getClass(), Neg13, getClass(), java.lang.Object), final
+Neg13.java:11:17: compiler.err.default.overrides.object.member: hashCode, kindname.interface, Neg13
+Neg13.java:12:18: compiler.err.override.meth: (compiler.misc.cant.override: notify(), Neg13, notify(), java.lang.Object), final
+Neg13.java:13:18: compiler.err.override.meth: (compiler.misc.cant.override: notifyAll(), Neg13, notifyAll(), java.lang.Object), final
+Neg13.java:14:20: compiler.err.default.overrides.object.member: toString, kindname.interface, Neg13
+Neg13.java:15:18: compiler.err.override.meth: (compiler.misc.cant.override: wait(), Neg13, wait(), java.lang.Object), final
+Neg13.java:16:18: compiler.err.override.meth: (compiler.misc.cant.override: wait(long), Neg13, wait(long), java.lang.Object), final
+Neg13.java:17:18: compiler.err.override.meth: (compiler.misc.cant.override: wait(long,int), Neg13, wait(long,int), java.lang.Object), final
+11 errors

test/tools/javac/defaultMethods/Neg14.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that a class cannot have two sibling interfaces with a default and abstract method
+ * @compile/fail/ref=Neg14.out -XDallowDefaultMethods -XDrawDiagnostics Neg14.java
+ */
+class Neg14 {
+    interface IA { int m(); }
+    interface IB { default int m() { return 1; } }
+
+    abstract class AB implements IA, IB {}
+}

test/tools/javac/defaultMethods/Neg14.out

+Neg14.java:10:14: compiler.err.types.incompatible.abstract.default: kindname.class, Neg14.AB, m, , Neg14.IB, Neg14.IA
+1 error

test/tools/javac/defaultMethods/Neg15.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that level skipping in default super calls is correctly rejected
+ * @compile/fail/ref=Neg15.out -XDallowDefaultMethods -XDrawDiagnostics Neg15.java
+ */
+class Neg15 {
+    interface I { default void m() {  } }
+    interface J extends I { default void m() {  } }
+    interface K extends I {}
+
+    static class C implements J, K {
+        void foo() { K.super.m(); }
+    }
+}

test/tools/javac/defaultMethods/Neg15.out

+Neg15.java:12:31: compiler.err.illegal.default.super.call: Neg15.K, (compiler.misc.overridden.default: m(), Neg15.J)
+1 error

test/tools/javac/defaultMethods/Neg16.java

+/*
+ * @test /nodynamiccopyright/
+ * @summary check that level skipping in default super calls is correctly rejected
+ * @compile/fail/ref=Neg16.out -XDallowDefaultMethods -XDrawDiagnostics Neg16.java
+ */
+class Neg16 {
+    interface I { default void m() {  } }
+    interface J extends I { default void m() {  } }
+
+    static class C implements I, J {
+        void foo() { I.super.m(); }
+    }
+}

test/tools/javac/defaultMethods/Neg16.out

+Neg16.java:11:23: compiler.err.illegal.default.super.call: Neg16.I, (compiler.misc.redundant.supertype: Neg16.I, Neg16.J)
+1 error

test/tools/javac/defaultMethods/Pos01.java

+/*
+ * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary basic test for default methods
+ * @ignore awaits lambda support
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowLambda -XDallowPoly -XDallowDefaultMethods Pos01.java
+ */
+
+import java.util.*;
+
+class Pos01 {
+
+    interface Mapper<T> {
+        T map(T in);
+    }
+
+    interface ExtendedList<T> extends List<T> {
+        default List<T> testMap(Mapper<T> r) {
+            return Pos01.<T>listMapper(this, r);
+        }
+    }
+
+    static class MyList<E> extends ArrayList<E> implements ExtendedList<E> {}
+
+    public static void main(String[] args) {
+       MyList<Integer> l = new MyList<Integer>();
+       l.add(1); l.add(2); l.add(3);
+       l.testMap((Integer x) -> x * x );
+    }
+
+    static <T> List<T> listMapper(List<T> l, Mapper<T> mapper) {
+        MyList<T> new_list = new MyList<T>();
+        for (T el : l) {
+            new_list.add(mapper.map(el));
+        }
+        return new_list;
+    }
+}

test/tools/javac/defaultMethods/Pos02.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary test for explicit resolution of ambiguous default methods
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos02.java
+ */
+
+class Pos02 {
+    interface IA { default int m() { return Pos02.m1(this); } }
+    interface IB { default int m() { return Pos02.m2(this); } }
+
+    static class A implements IA {}
+    static class B implements IB {}
+
+    static class AB implements IA, IB {
+        public int m() { return 0; }
+        void test() {
+            AB.this.m();
+            IA.super.m();
+        }
+    }
+
+    static int m1(IA a) { return 0; }
+    static int m2(IB b) { return 0; }
+}

test/tools/javac/defaultMethods/Pos04.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary test for overriding with default method
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos04.java
+ */
+
+class Pos04 {
+    interface A { default int m() { return Pos04.m(this); } }
+    static abstract class B { public int m() { return 0; } }
+
+    static class C extends B implements A {
+        void test() {
+            C.this.m();
+            A.super.m();
+        }
+    }
+
+    static int m(A a) { return 0; }
+}

test/tools/javac/defaultMethods/Pos05.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that indirectly inherited default methods are discovered during resolution
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos05.java
+ */
+
+class Pos05  {
+     interface A {
+         default void m() { Pos05.impl(this); }
+     }
+
+     interface B extends A { }
+
+     static class E implements B { }
+
+     void test(E e) {
+         e.m();
+     }
+
+     static void impl(A a) { }
+}

test/tools/javac/defaultMethods/Pos06.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that well-formed MI hierarchies behaves well w.r.t. method resolution (i.e. no ambiguities)
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos06.java
+ */
+
+class Pos06 {
+     interface A {
+         default void m() { Pos06.impl(this); }
+     }
+
+     interface B extends A {
+         default void m() { Pos06.impl(this); }
+     }
+
+     static class X implements A, B { }
+
+     void test(X x) {
+         x.m();
+         ((A)x).m();
+         ((B)x).m();
+     }
+
+     static void impl(Object a) { }
+}

test/tools/javac/defaultMethods/Pos07.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that compilation order does not matter
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos07.java
+ */
+
+class Pos07 {
+    interface A {
+         default void foo() { Pos07.impl(this); }
+         default void bar() { Pos07.impl(this); }
+    }
+
+    static class C implements B, A {}
+
+    interface B extends A {
+        default void foo() { Pos07.impl(this); }
+    }
+
+    static void impl(A a) {}
+}

test/tools/javac/defaultMethods/Pos08.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that common overrider solves default method conflicts
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos08.java
+ */
+
+class Pos08 {
+    interface A {
+        default void m() { Pos08.a(this); }
+    }
+
+    interface B {
+        default void m() { Pos08.b(this); }
+    }
+
+    interface C extends A, B {
+        default void m() { Pos08.b(this); }
+    }
+
+    static void a(A o) { }
+    static void b(B o) { }
+}

test/tools/javac/defaultMethods/Pos10.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that type-variables in generic extension decl can be accessed from default impl
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods Pos10.java
+ */
+
+class Pos10 {
+    interface Function<X,Y> {
+        Y apply(X x);
+    }
+
+    interface A<T> {
+        default <R> void m(Function<T,R> f) { Impl.<T,R>m(this, f); }
+    }
+
+    static class Impl {
+        static <T,R> void m(A<T> a, Function<T,R> f) {  }
+    }
+}

test/tools/javac/defaultMethods/Pos11.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary complex test with conflict resolution via overriding
+ * @author  Brian Goetz
+ * @compile -XDallowDefaultMethods Pos11.java
+ */
+
+class Pos11 {
+    interface A {
+        default void get() { Pos11.one(this); }
+    }
+
+    interface B {
+        default void get() { Pos11.two(this); }
+    }
+
+    interface C extends A {
+        default void get() { Pos11.two(this); }
+    }
+
+    interface D extends A, B {
+        default void get() { Pos11.two(this); }
+    }
+
+    static class X implements C { }
+
+    static class Y implements C, A { }
+
+    static class Z implements D, A, B { }
+
+    static void one(Object a) {  }
+    static void two(Object a) {  }
+}

test/tools/javac/defaultMethods/Pos12.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that 'this' can be used from within an extension method
+ * @compile -XDallowDefaultMethods Pos12.java
+ */
+
+interface Pos12 {
+
+    default Object m() {
+        Object o = this;
+        f(this);
+        return this;
+    }
+
+    void f(Object o);
+}

test/tools/javac/defaultMethods/Pos13.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary qualified 'this' inside default method causes StackOverflowException
+ * @compile -XDallowDefaultMethods Pos13.java
+ */
+
+public class Pos13 {
+
+    static int assertionCount = 0;
+
+    static void assertTrue(boolean cond) {
+        assertionCount++;
+        if (!cond)
+            throw new AssertionError();
+    }
+
+    interface Outer {
+        abstract void doSomething();
+
+        default void m() {
+            new SubOuter() {
+                public void doSomething() {
+                    Outer.this.doSomething();
+                }
+            }.doSomething();
+        }
+    }
+
+    interface SubOuter extends Outer { }
+
+    static class E implements Outer {
+        public void doSomething() { assertTrue(true); }
+    }
+
+    public static void main(String[] args) {
+        new E().m();
+        assertTrue(assertionCount == 1);
+    }
+}

test/tools/javac/defaultMethods/Pos14.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that overload resolution selects most specific signature
+ * @compile -XDallowDefaultMethods Pos14.java
+ */
+
+class Pos14 {
+    interface A { default Object m() { return null; } }
+    static abstract class B { abstract public String m(); }
+
+    static abstract class C extends B implements A {
+        void test() {
+            m().length();
+        }
+    }
+}

test/tools/javac/defaultMethods/Pos15.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that overload resolution selects most specific signature
+ * @compile -XDallowDefaultMethods Pos15.java
+ */
+
+class Pos15 {
+    interface A { default String m() { return null; } }
+    static abstract class B { abstract public Object m(); }
+
+    static abstract class C extends B implements A {
+        void test() {
+            m().length();
+        }
+    }
+}

test/tools/javac/defaultMethods/Pos16.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary 'class wins' should not short-circuit overload resolution
+ * @compile -XDallowDefaultMethods Pos16.java
+ */
+
+class Pos16 {
+    interface I {
+        default String m(Integer i) { return ""; }
+    }
+
+    class C implements I {
+        Integer m(Object o) { return 1; }
+    }
+
+    void test(C c) {
+        c.m(1).length();
+    }
+}

test/tools/javac/defaultMethods/TestDefaultBody.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @ignore awaits for VM support
+ * @summary  check that code attributed for default methods is correctly generated
+ * @compile -XDallowDefaultMethods TestDefaultBody.java
+ * @run main TestDefaultBody
+ */
+
+import com.sun.tools.classfile.AccessFlags;
+import com.sun.tools.classfile.Attribute;
+import com.sun.tools.classfile.ClassFile;
+import com.sun.tools.classfile.ConstantPool.*;
+import com.sun.tools.classfile.Code_attribute;
+import com.sun.tools.classfile.Instruction;
+import com.sun.tools.classfile.Method;
+
+import com.sun.tools.classfile.Opcode;
+import java.io.*;
+
+public class TestDefaultBody {
+
+    interface TestInterface {
+        int no_default(int i);
+        default int yes_default(int i) { return impl(this, i); }
+    }
+
+    static int impl(TestInterface ti, int i) { return 0; }
+
+    static final String TARGET_CLASS_NAME = "TestDefaultBody";
+    static final String TARGET_NAME = "impl";
+    static final String TARGET_TYPE = "(LTestDefaultBody$TestInterface;I)I";
+    static final String SUBTEST_NAME = TestInterface.class.getName() + ".class";
+    static final String TEST_METHOD_NAME = "yes_default";
+
+    public static void main(String... args) throws Exception {
+        new TestDefaultBody().run();
+    }
+
+    public void run() throws Exception {
+        String workDir = System.getProperty("test.classes");
+        File compiledTest = new File(workDir, SUBTEST_NAME);
+        verifyDefaultBody(compiledTest);
+    }
+
+    void verifyDefaultBody(File f) {
+        System.err.println("verify: " + f);
+        try {
+            ClassFile cf = ClassFile.read(f);
+            Method testMethod = null;
+            Code_attribute codeAttr = null;
+            for (Method m : cf.methods) {
+                codeAttr = (Code_attribute)m.attributes.get(Attribute.Code);
+                String mname = m.getName(cf.constant_pool);
+                if (mname.equals(TEST_METHOD_NAME)) {
+                    testMethod = m;
+                    break;
+                } else {
+                    codeAttr = null;
+                }
+            }
+            if (testMethod == null) {
+                throw new Error("Test method not found");
+            }
+            if (testMethod.access_flags.is(AccessFlags.ACC_ABSTRACT)) {
+                throw new Error("Test method is abstract");
+            }
+            if (codeAttr == null) {
+                throw new Error("Code attribute in test method not found");
+            }
+
+            boolean found = false;
+            for (Instruction instr : codeAttr.getInstructions()) {
+                if (instr.getOpcode() == Opcode.INVOKESTATIC) {
+                    found = true;
+                    int pc_index = instr.getShort(1);
+                    CONSTANT_Methodref_info mref = (CONSTANT_Methodref_info)cf.constant_pool.get(pc_index);
+                    String className = mref.getClassName();
+                    String targetName = mref.getNameAndTypeInfo().getName();
+                    String targetType = mref.getNameAndTypeInfo().getType();
+
+                    if (!className.equals(TARGET_CLASS_NAME)) {
+                        throw new Error("unexpected class in default method body " + className);
+                    }
+                    if (!targetName.equals(TARGET_NAME)) {
+                        throw new Error("unexpected method name in default method body " + targetName);
+                    }
+                    if (!targetType.equals(TARGET_TYPE)) {
+                        throw new Error("unexpected method type in default method body " + targetType);
+                    }
+                    break;
+                }
+            }
+
+            if (!found) {
+                throw new Error("no invokestatic found in default method body");
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new Error("error reading " + f +": " + e);
+        }
+    }
+}

test/tools/javac/defaultMethods/TestNoBridgeOnDefaults.java

+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @ignore awaits for VM support
+ * @summary  check that javac does not generate bridge methods for defaults
+ * @compile -XDallowDefaultMethods TestNoBridgeOnDefaults.java
+ * @run main TestNoBridgeOnDefaults
+ */
+
+import com.sun.tools.classfile.ClassFile;
+import com.sun.tools.classfile.ConstantPool.*;
+import com.sun.tools.classfile.Method;
+
+import java.io.*;
+
+public class TestNoBridgeOnDefaults {
+
+    interface A<X> {
+        default <Y> A<X> m(X x, Y y) { return Impl.<X,Y>m1(this, x, y); }
+    }
+
+    static abstract class B<X> implements A<X> { }
+
+    interface C<X> extends A<X> {
+        default <Y> C<X> m(X x, Y y) { return Impl.<X,Y>m2(this, x, y); }
+    }
+
+    static abstract class D<X> extends B<X> implements C<X> { }
+
+    static class Impl {
+       static <X, Y> A<X> m1(A<X> rec, X x, Y y) { return null; }
+       static <X, Y> C<X> m2(C<X> rec, X x, Y y) { return null; }
+    }
+
+    static final String[] SUBTEST_NAMES = { B.class.getName() + ".class", D.class.getName() + ".class" };
+    static final String TEST_METHOD_NAME = "m";
+
+    public static void main(String... args) throws Exception {
+        new TestNoBridgeOnDefaults().run();
+    }
+
+    public void run() throws Exception {
+        String workDir = System.getProperty("test.classes");
+        for (int i = 0 ; i < SUBTEST_NAMES.length ; i ++) {
+            File compiledTest = new File(workDir, SUBTEST_NAMES[i]);
+            checkNoBridgeOnDefaults(compiledTest);
+        }
+    }
+
+    void checkNoBridgeOnDefaults(File f) {
+        System.err.println("check: " + f);
+        try {
+            ClassFile cf = ClassFile.read(f);
+            for (Method m : cf.methods) {
+                String mname = m.getName(cf.constant_pool);
+                if (mname.equals(TEST_METHOD_NAME)) {
+                    throw new Error("unexpected bridge method found " + m);
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            throw new Error("error reading " + f +": " + e);
+        }
+    }
+}

test/tools/javac/defaultMethods/crossCompile/Clinit.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+interface Clinit {
+    String s = Inner.m();
+
+    static class Inner {
+        static String m() { return ""; }
+    }
+}

test/tools/javac/defaultMethods/crossCompile/CrossCompile.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary check that clinit in interface doesn't cause spurious default method diagnostics
+ * @compile -source 1.4 -target 1.4 Clinit.java
+ * @compile CrossCompile.java
+ */
+class CrossCompile {
+   void test() {
+        String s = Clinit.s;
+   }
+}

test/tools/javac/defaultMethods/fd/FDTest.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary Automatic test for checking correctness of default resolution
+ */
+
+import shapegen.*;
+
+import com.sun.source.util.JavacTask;
+
+import java.net.URI;
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+import javax.tools.Diagnostic;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.ToolProvider;
+
+public class FDTest {
+
+    enum TestKind {
+        POSITIVE,
+        NEGATIVE;
+
+        Collection<Hierarchy> getHierarchy(HierarchyGenerator hg) {
+            return this == POSITIVE ?
+                    hg.getOK() : hg.getErr();
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        //create default shared JavaCompiler - reused across multiple compilations
+        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
+        StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);
+
+        HierarchyGenerator hg = new HierarchyGenerator();
+        for (TestKind tk : TestKind.values()) {
+            for (Hierarchy hs : tk.getHierarchy(hg)) {
+                new FDTest(tk, hs).run(comp, fm);
+            }
+        }
+    }
+
+    TestKind tk;
+    Hierarchy hs;
+    DefenderTestSource source;
+    DiagnosticChecker diagChecker;
+
+    FDTest(TestKind tk, Hierarchy hs) {
+        this.tk = tk;
+        this.hs = hs;
+        this.source = new DefenderTestSource();
+        this.diagChecker = new DiagnosticChecker();
+    }
+
+    void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {
+        JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,
+                Arrays.asList("-XDallowDefaultMethods"), null, Arrays.asList(source));
+        try {
+            ct.analyze();
+        } catch (Throwable ex) {
+            throw new AssertionError("Error thrown when analyzing the following source:\n" + source.getCharContent(true));
+        }
+        check();
+    }
+
+    void check() {
+        boolean errorExpected = tk == TestKind.NEGATIVE;
+        if (errorExpected != diagChecker.errorFound) {
+            throw new AssertionError("problem in source: \n" +
+                    "\nerror found = " + diagChecker.errorFound +
+                    "\nerror expected = " + errorExpected +
+                    "\n" + dumpHierarchy() +
+                    "\n" + source.getCharContent(true));
+        }
+    }
+
+    String dumpHierarchy() {
+        StringBuilder buf = new StringBuilder();
+        buf.append("root = " + hs.root + "\n");
+        for (ClassCase cc : hs.all) {
+            buf.append("  class name = " + cc.getName() + "\n");
+            buf.append("    class OK = " + cc.get_OK() + "\n");
+            buf.append("    prov = " + cc.get_mprov() + "\n");
+
+        }
+        return buf.toString();
+    }
+
+    class DefenderTestSource extends SimpleJavaFileObject {
+
+        String source;
+
+        public DefenderTestSource() {
+            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
+            StringBuilder buf = new StringBuilder();
+            List<ClassCase> defaultRef = new ArrayList<>();
+            for (ClassCase cc : hs.all) {
+                hs.genClassDef(buf, cc, null, defaultRef);
+            }
+            source = buf.toString();
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return source;
+        }
+    }
+
+    static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {
+
+        boolean errorFound;
+
+        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
+            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
+                errorFound = true;
+            }
+        }
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/ClassCase.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ *
+ * @author Robert Field
+ */
+public class ClassCase {
+
+    public enum Kind {
+        IVAC        (true,  "v"),
+        IPRESENT    (true,  "p"),
+        IDEFAULT    (true,  "d"),
+        CNONE       (false, "n"),
+        CABSTRACT   (false, "a"),
+        CCONCRETE   (false, "c");
+
+        private final String prefix;
+        public final boolean isInterface;
+
+        Kind(boolean isInterface, String prefix) {
+            this.isInterface = isInterface;
+            this.prefix = prefix;
+        }
+    }
+
+    public final Kind kind;
+    private final ClassCase superclass;
+    private final List<ClassCase> supertypes;
+
+    private String name;
+    private boolean _OK;
+    private boolean _HasClassMethod;
+    private Set<ClassCase> _mprov;
+    private boolean _IsConcrete;
+    private boolean _HasDefault;
+    private ClassCase _mres;
+    private ClassCase _mdefend;
+
+    private Set<RuleGroup> executed = new HashSet<RuleGroup>() {};
+
+    public ClassCase(Kind kind, ClassCase superclass, List<ClassCase> interfaces) {
+        this.kind = kind;
+        this.superclass = superclass;
+
+        // Set supertypes from superclass (if any) and interfaces
+        List<ClassCase> lc;
+        if (superclass == null) {
+            lc = interfaces;
+        } else {
+            lc = new ArrayList<>();
+            lc.add(superclass);
+            lc.addAll(interfaces);
+        }
+        this.supertypes = lc;
+    }
+
+    public final boolean isInterface() { return kind.isInterface; }
+    public final boolean isClass() { return !kind.isInterface; }
+
+    public Set<ClassCase> get_mprov() {
+        exec(RuleGroup.PROVENENCE);
+        return _mprov;
+    }
+
+    public void set_mprov(ClassCase cc) {
+        Set<ClassCase> s = new HashSet<>();
+        s.add(cc);
+        _mprov = s;
+    }
+
+    public void set_mprov(Set<ClassCase> s) {
+        _mprov = s;
+    }
+
+    public ClassCase get_mres() {
+        exec(RuleGroup.RESOLUTION);
+        return _mres;
+    }
+
+    public void set_mres(ClassCase cc) {
+        _mres = cc;
+    }
+
+    public ClassCase get_mdefend() {
+        exec(RuleGroup.DEFENDER);
+        return _mdefend;
+    }
+
+    public void set_mdefend(ClassCase cc) {
+        _mdefend = cc;
+    }
+
+    public boolean get_HasClassMethod() {
+        exec(RuleGroup.PROVENENCE);
+        return _HasClassMethod;
+    }
+
+    public void set_HasClassMethod(boolean bool) {
+        _HasClassMethod = bool;
+    }
+
+    public boolean get_HasDefault() {
+        exec(RuleGroup.MARKER);
+        return _HasDefault;
+    }
+
+    public void set_HasDefault(boolean bool) {
+        _HasDefault = bool;
+    }
+
+    public boolean get_IsConcrete() {
+        exec(RuleGroup.MARKER);
+        return _IsConcrete;
+    }
+
+    public void set_IsConcrete(boolean bool) {
+        _IsConcrete = bool;
+    }
+
+    public boolean get_OK() {
+        exec(RuleGroup.CHECKING);
+        return _OK;
+    }
+
+    public void set_OK(boolean bool) {
+        _OK = bool;
+    }
+
+    public boolean isMethodDefined() {
+        for (ClassCase cc : supertypes) {
+            if (cc.isMethodDefined()) {
+                return true;
+            }
+        }
+        switch (kind) {
+            case CCONCRETE:
+            case CABSTRACT:
+            case IPRESENT:
+            case IDEFAULT:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    public boolean isAbstract() {
+        return isMethodDefined() && (get_mres()==null);
+    }
+
+    public boolean hasSuperclass() {
+        return superclass != null;
+    }
+
+    public ClassCase getSuperclass() {
+        return superclass;
+    }
+
+    public List<ClassCase> getSupertypes() {
+        return supertypes;
+    }
+
+    public List<ClassCase> getInterfaces() {
+        if (superclass != null) {
+            if (supertypes.get(0) != superclass) {
+                throw new AssertionError("superclass missing from supertypes");
+            }
+            return supertypes.subList(1, supertypes.size());
+        } else {
+            return supertypes;
+        }
+    }
+
+    public boolean isSubtypeOf(ClassCase cc) {
+        // S-Refl
+        if (cc.equals(this)) {
+            return true;
+        }
+
+        // S-Def
+        for (ClassCase sp : getSupertypes()) {
+            if (cc.equals(sp)) {
+                return true;
+            }
+        }
+
+        // _S-Trans
+        for (ClassCase sp : getSupertypes()) {
+            if (sp.isSubtypeOf(cc)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public void init(Map<String, Integer> namingContext) {
+        if (name != null) {
+            return; // Already inited
+        }
+
+        for (ClassCase sup : supertypes) {
+            sup.init(namingContext);
+        }
+
+        // Build name
+        StringBuilder sb = new StringBuilder();
+        if (!supertypes.isEmpty()) {
+            sb.append(isInterface() ? "I" : "C");
+            for (ClassCase cc : supertypes) {
+                sb.append(cc.getName());
+            }
+            sb.append(kind.isInterface ? "i" : "c");
+        }
+        sb.append(kind.prefix);
+        String pname = sb.toString();
+        Integer icnt = namingContext.get(pname);
+        int cnt = icnt == null ? 0 : icnt;
+        ++cnt;
+        namingContext.put(pname, cnt);
+        if (cnt > 1) {
+            sb.append(cnt);
+        }
+        this.name = sb.toString();
+    }
+
+    public boolean isa(Kind... kinds) {
+        for (Kind k : kinds) {
+            if (kind == k) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private void exec(RuleGroup rg ) {
+        if (!executed.contains(rg)) {
+            rg.exec(this);
+            executed.add(rg);
+        }
+    }
+
+    public void collectClasses(Set<ClassCase> seen) {
+        seen.add(this);
+        for (ClassCase cc : supertypes) {
+            cc.collectClasses(seen);
+        }
+    }
+
+    public String getID() {
+        if (name == null) {
+            throw new Error("Access to uninitialized ClassCase");
+        } else {
+            return name;
+        }
+    }
+
+    public final String getName() {
+        if (name == null) {
+            return "ClassCase uninited@" + hashCode();
+        } else {
+            return name;
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof ClassCase && getID().equals(((ClassCase)obj).getID());
+    }
+
+    @Override
+    public int hashCode() {
+        return getID().hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return getName();
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/Hierarchy.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import java.util.List;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Set;
+
+import static shapegen.ClassCase.Kind.*;
+
+/**
+ *
+ * @author Robert Field
+ */
+public class Hierarchy {
+
+    public final ClassCase root;
+    public final Set<ClassCase> all;
+
+    public Hierarchy(ClassCase root) {
+        this.root = root;
+        root.init(new HashMap<String,Integer>());
+        Set<ClassCase> allClasses = new HashSet<>();
+        root.collectClasses(allClasses);
+        this.all = allClasses;
+    }
+
+    public boolean anyDefaults() {
+        for (ClassCase cc : all) {
+            if (cc.kind == IDEFAULT) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public boolean get_OK() {
+        return root.get_OK();
+    }
+
+    public String testName() {
+        return root + "Test";
+    }
+
+    private static void genInterfaceList(StringBuilder buf, String prefix, List<ClassCase> interfaces) {
+        if (!interfaces.isEmpty()) {
+            buf.append(" ");
+            buf.append(prefix);
+            buf.append(" ");
+            buf.append(interfaces.get(0));
+            for (int i = 1; i < interfaces.size(); ++i) {
+                buf.append(", " + interfaces.get(i));
+            }
+        }
+    }
+
+    public static void genClassDef(StringBuilder buf, ClassCase cc, String implClass, List<ClassCase> defaultRef) {
+        if (cc.isInterface()) {
+            buf.append("interface ");
+            buf.append(cc.getName() + " ");
+            genInterfaceList(buf, "extends", cc.getInterfaces());
+            buf.append(" {\n");
+
+            switch (cc.kind) {
+                case IDEFAULT:
+                    buf.append("    default String m() { return \"\"; }\n");
+                    defaultRef.add(cc);
+                    break;
+                case IPRESENT:
+                    buf.append("    String m();\n");
+                    break;
+                case IVAC:
+                    break;
+                default:
+                    throw new AssertionError("Unexpected kind");
+            }
+            buf.append("}\n\n");
+        } else {
+            buf.append((cc.isAbstract()? "abstract " : ""));
+            buf.append(" class " + cc.getName());
+            if (cc.getSuperclass() != null) {
+                buf.append(" extends " + cc.getSuperclass());
+            }
+
+            genInterfaceList(buf, "implements", cc.getInterfaces());
+            buf.append(" {\n");
+
+            switch (cc.kind) {
+                case CCONCRETE:
+                    buf.append("   public String m() { return \"\"; }\n");
+                    break;
+                case CABSTRACT:
+                    buf.append("   public abstract String m();\n");
+                    break;
+                case CNONE:
+                    break;
+                default:
+                    throw new AssertionError("Unexpected kind");
+            }
+            buf.append("}\n\n");
+        }
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        return obj instanceof Hierarchy && root.getID().equals(((Hierarchy)obj).root.getID());
+    }
+
+    @Override
+    public int hashCode() {
+        return root.getID().hashCode();
+    }
+
+    @Override
+    public String toString() {
+        return root.getName();
+    }
+
+}

test/tools/javac/defaultMethods/fd/shapegen/HierarchyGenerator.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import shapegen.ClassCase.Kind;
+
+import java.util.Collection;
+import java.util.Set;
+import java.util.HashSet;
+import java.util.Collections;
+import java.util.ArrayList;
+import java.util.List;
+
+import static shapegen.ClassCase.Kind.*;
+
+import static java.lang.Math.pow;
+
+/**
+ *
+ * @author Robert Field
+ */
+public final class HierarchyGenerator {
+
+    private static int okcnt = 0;
+    private static int errcnt = 0;
+    private static Set<Hierarchy> uniqueOK = new HashSet<>();
+    private static Set<Hierarchy> uniqueErr = new HashSet<>();
+
+    /**
+     * @param args the command line arguments
+     */
+    public HierarchyGenerator() {
+        organize("exhaustive interface", iExhaustive(2));
+        organize("exhaustive class", cExhaustive());
+        organize("shapes interface", iShapes());
+        organize("shapes class/interface", ciShapes());
+
+        System.out.printf("\nExpect OK:    %d -- unique %d",   okcnt,  uniqueOK.size());
+        System.out.printf("\nExpect Error: %d -- unique %d\n", errcnt, uniqueErr.size());
+    }
+
+    public Collection<Hierarchy> getOK() {
+        return uniqueOK;
+    }
+
+    public Collection<Hierarchy> getErr() {
+        return uniqueErr;
+    }
+
+    private void organize(String tname, List<Hierarchy> totest) {
+        System.out.printf("\nTesting %s....\n", tname);
+        int nodefault = 0;
+        List<Hierarchy> ok = new ArrayList<>();
+        List<Hierarchy> err = new ArrayList<>();
+        for (Hierarchy cc : totest) {
+            if (cc.anyDefaults()) {
+                //System.out.printf("  %s\n", cc);
+                if (cc.get_OK()) {
+                    ok.add(cc);
+                } else {
+                    err.add(cc);
+                }
+            } else {
+                ++nodefault;
+            }
+        }
+
+        errcnt += err.size();
+        okcnt += ok.size();
+        uniqueErr.addAll(err);
+        uniqueOK.addAll(ok);
+
+        System.out.printf("  %5d No default\n  %5d Error\n  %5d OK\n  %5d Total\n",
+                nodefault, err.size(), ok.size(), totest.size());
+    }
+
+    public List<Hierarchy> iExhaustive(int idepth) {
+        List<ClassCase> current = new ArrayList<>();
+        for (int i = 0; i < idepth; ++i) {
+            current = ilayer(current);
+        }
+        return wrapInClassAndHierarchy(current);
+    }
+
+    private List<ClassCase> ilayer(List<ClassCase> srcLayer) {
+        List<ClassCase> lay = new ArrayList<>();
+        for (int i = (int) pow(2, srcLayer.size()) - 1; i >= 0; --i) {
+            List<ClassCase> itfs = new ArrayList<>();
+            for (int b = srcLayer.size() - 1; b >= 0; --b) {
+                if ((i & (1<<b)) != 0) {
+                    itfs.add(srcLayer.get(b));
+                }
+            }
+            lay.add(new ClassCase(IVAC, null, itfs));
+            lay.add(new ClassCase(IPRESENT, null, itfs));
+            lay.add(new ClassCase(IDEFAULT, null, itfs));
+            lay.add(new ClassCase(IDEFAULT, null, itfs));
+        }
+        return lay;
+    }
+
+    public List<Hierarchy> cExhaustive() {
+        final Kind[] iKinds = new Kind[]{IDEFAULT, IVAC, IPRESENT, null};
+        final Kind[] cKinds = new Kind[]{CNONE, CABSTRACT, CCONCRETE};
+        List<Hierarchy> totest = new ArrayList<>();
+        for (int i1 = 0; i1 < iKinds.length; ++i1) {
+            for (int i2 = 0; i2 < iKinds.length; ++i2) {
+                for (int i3 = 0; i3 < iKinds.length; ++i3) {
+                    for (int c1 = 0; c1 < cKinds.length; ++c1) {
+                        for (int c2 = 0; c2 < cKinds.length; ++c2) {
+                            for (int c3 = 0; c3 < cKinds.length; ++c3) {
+                                totest.add( new Hierarchy(
+                                        new ClassCase(cKinds[c1],
+                                            new ClassCase(cKinds[c2],
+                                                new ClassCase(cKinds[c3],
+                                                    null,
+                                                    iList(iKinds[i1])
+                                                ),
+                                                iList(iKinds[i2])
+                                            ),
+                                            iList(iKinds[i3])
+                                        )));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return totest;
+    }
+
+    private List<ClassCase> iList(Kind kind) {
+        if (kind == null) {
+            return Collections.EMPTY_LIST;
+        } else {
+            List<ClassCase> itfs = new ArrayList<>();
+            itfs.add(new ClassCase(kind, null, Collections.EMPTY_LIST));
+            return itfs;
+        }
+    }
+
+    public List<Hierarchy> ciShapes() {
+        return wrapInHierarchy(TTShape.allCases(true));
+    }
+
+    public List<Hierarchy> iShapes() {
+        return wrapInClassAndHierarchy(TTShape.allCases(false));
+    }
+
+    public List<Hierarchy> wrapInClassAndHierarchy(List<ClassCase> ihs) {
+        List<Hierarchy> totest = new ArrayList<>();
+        for (ClassCase cc : ihs) {
+            List<ClassCase> interfaces = new ArrayList<>();
+            interfaces.add(cc);
+            totest.add(new Hierarchy(new ClassCase(CNONE, null, interfaces)));
+        }
+        return totest;
+    }
+
+    public List<Hierarchy> wrapInHierarchy(List<ClassCase> ihs) {
+        List<Hierarchy> totest = new ArrayList<>();
+        for (ClassCase cc : ihs) {
+            totest.add(new Hierarchy(cc));
+        }
+        return totest;
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/Rule.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+/**
+ *
+ * @author Robert Field
+ */
+public abstract class Rule {
+
+    public final String name;
+
+    public Rule(String name) {
+        this.name = name;
+    }
+
+    abstract boolean guard(ClassCase cc);
+
+    abstract void eval(ClassCase cc);
+
+    @Override
+    public String toString() {
+        return name;
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/RuleGroup.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import java.util.HashSet;
+import java.util.Set;
+
+import static shapegen.ClassCase.Kind.*;
+
+/**
+ *
+ * @author Robert Field
+ */
+public class RuleGroup {
+
+    final String name;
+    private final Rule[] rules;
+
+    public RuleGroup(String name, Rule[] rules) {
+        this.name = name;
+        this.rules = rules;
+    }
+
+    public boolean exec(ClassCase cc) {
+        boolean found = false;
+        for (Rule rule : rules) {
+            if (rule.guard(cc)) {
+                if (found) {
+                    throw new RuntimeException("Bad rules -- multiple matches " + toString() + " for " + cc);
+                } else {
+                    rule.eval(cc);
+                    found = true;
+                }
+            }
+        }
+        return found;
+    }
+
+    @Override
+    public String toString() {
+        return name;
+    }
+
+    public static RuleGroup PROVENENCE = new RuleGroup("Provenence", new Rule[] {
+        new Rule("P-CDeclare") {
+            boolean guard(ClassCase cc) {
+                return cc.isa(CCONCRETE, CABSTRACT);
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_mprov(cc);
+                cc.set_HasClassMethod(true);
+            }
+        },
+
+        new Rule("P-IDeclare") {
+            boolean guard(ClassCase cc) {
+                return cc.isa(IDEFAULT, IPRESENT);
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_mprov(cc);
+            }
+        },
+
+        new Rule("P-IntfInh") {
+            boolean guard(ClassCase cc) {
+                return cc.isa(IVAC, CNONE) && !(cc.hasSuperclass() && cc.getSuperclass().get_HasClassMethod());
+            }
+
+            void eval(ClassCase cc) {
+                Set<ClassCase> _S = new HashSet<>();
+                for (ClassCase t : cc.getSupertypes()) {
+                    _S.addAll(t.get_mprov());
+                }
+                Set<ClassCase> tops = new HashSet<>();
+                for (ClassCase _W : _S) {
+                    for (ClassCase _V : _S) {
+                        if (_V.equals(_W) || !(_V.isSubtypeOf(_W))) {
+                            tops.add(_W);
+                        }
+                    }
+                }
+                cc.set_mprov(tops);
+            }
+        },
+
+        new Rule("P-ClassInh") {
+            boolean guard(ClassCase cc) {
+                return cc.isa(CNONE) && (cc.hasSuperclass() && cc.getSuperclass().get_HasClassMethod());
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_mprov(cc.getSuperclass());
+                cc.set_HasClassMethod(true);
+            }
+        },
+
+    });
+
+    public static RuleGroup MARKER = new RuleGroup("Marker", new Rule[] {
+        new Rule("M-Default") {
+            boolean guard(ClassCase cc) {
+                return cc.isa(IDEFAULT);
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_HasDefault(true);
+            }
+        },
+
+        new Rule("M-Conc") {
+            boolean guard(ClassCase cc) {
+              return cc.isa(CCONCRETE);
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_IsConcrete(true);
+            }
+        },
+
+    });
+
+    public static RuleGroup RESOLUTION = new RuleGroup("Resolution", new Rule[] {
+        new Rule("R-Resolve") {
+            boolean guard(ClassCase cc) {
+                if (!(cc.isClass() && cc.get_mprov().size() == 1)) {
+                    return false;
+                }
+                ClassCase _V = cc.get_mprov().iterator().next();
+                return _V.get_IsConcrete() || _V.get_HasDefault();
+            }
+
+            void eval(ClassCase cc) {
+                ClassCase _V = cc.get_mprov().iterator().next();
+                cc.set_mres(_V);
+            }
+        },
+
+    });
+
+    public static RuleGroup DEFENDER = new RuleGroup("Defender", new Rule[] {
+        new Rule("D-Defend") {
+            boolean guard(ClassCase cc) {
+                ClassCase mresSuper = cc.hasSuperclass() ? cc.getSuperclass().get_mres() : null;
+                boolean eq = cc.get_mres() == null ? mresSuper == null : cc.get_mres().equals(mresSuper);
+                return cc.isa(CNONE) && !eq;
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_mdefend(cc.get_mres());
+            }
+        },
+
+    });
+
+    public static RuleGroup CHECKING = new RuleGroup("Checking", new Rule[] {
+        new Rule("C-Check") {
+            boolean guard(ClassCase cc) {
+                for (ClassCase t : cc.getSupertypes()) {
+                    if (! t.get_OK()) {
+                        return false;
+                    }
+                }
+                int defenderCount = 0;
+                int provCount = 0;
+                for (ClassCase prov : cc.get_mprov()) {
+                    if (prov.get_HasDefault()) {
+                        defenderCount++;
+                    }
+                    provCount++;
+                }
+                return provCount <= 1 || defenderCount == 0;
+            }
+
+            void eval(ClassCase cc) {
+                cc.set_OK(true);
+            }
+        },
+
+    });
+
+}

test/tools/javac/defaultMethods/fd/shapegen/TTNode.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import shapegen.ClassCase.Kind;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+
+import static shapegen.ClassCase.Kind.*;
+
+/**
+ * Type Template Node
+ *
+ * @author Robert Field
+ */
+public class TTNode {
+
+    final List<TTNode> supertypes;
+    final boolean canBeClass;
+
+    private int currentKindIndex;
+    private Kind[] kinds;
+
+    public TTNode(List<TTNode> subtypes, boolean canBeClass) {
+        this.supertypes = subtypes;
+        this.canBeClass = canBeClass;
+    }
+
+    public void start(boolean includeClasses) {
+        kinds =
+             supertypes.isEmpty()?
+                (new Kind[]{IDEFAULT, IPRESENT})
+             :  ((includeClasses && canBeClass)?
+                  new Kind[]{CNONE, IVAC, IDEFAULT, IPRESENT}
+                : new Kind[]{IVAC, IDEFAULT, IPRESENT});
+        currentKindIndex = 0;
+
+        for (TTNode sub : supertypes) {
+            sub.start(includeClasses);
+        }
+    }
+
+    public boolean next() {
+        ++currentKindIndex;
+        if (currentKindIndex >= kinds.length) {
+            currentKindIndex = 0;
+            return false;
+        } else {
+            return true;
+        }
+    }
+
+    public void collectAllSubtypes(Set<TTNode> subs) {
+        subs.add(this);
+        for (TTNode n : supertypes) {
+            n.collectAllSubtypes(subs);
+        }
+    }
+
+    private Kind getKind() {
+        return kinds[currentKindIndex];
+    }
+
+    boolean isInterface() {
+        return getKind().isInterface;
+    }
+
+    boolean isClass() {
+        return !isInterface();
+    }
+
+    boolean hasDefault() {
+        return getKind() == IDEFAULT;
+    }
+
+    public boolean isValid() {
+        for (TTNode n : supertypes) {
+            if (!n.isValid() || (isInterface() && n.isClass())) {
+                return false;
+            }
+        }
+        return true;
+    }
+
+    public ClassCase genCase() {
+        ClassCase subclass;
+        List<TTNode> ttintfs;
+        if (isClass() && !supertypes.isEmpty() && supertypes.get(0).isClass()) {
+            subclass = supertypes.get(0).genCase();
+            ttintfs = supertypes.subList(1, supertypes.size());
+        } else {
+            subclass = null;
+            ttintfs = supertypes;
+        }
+        List<ClassCase> intfs = new ArrayList<>();
+        for (TTNode node : ttintfs) {
+            intfs.add(node.genCase());
+        }
+        return new ClassCase(getKind(), subclass, intfs);
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/TTParser.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.io.IOException;
+import java.io.StringReader;
+
+import static java.lang.Character.isLetter;
+import static java.lang.Character.isUpperCase;
+import static java.lang.Character.isWhitespace;
+
+/**
+ * Parse a type template definition string
+ *
+ *   input     :: classDef
+ *   classDef  :: letter [ ( classDef* ) ]
+ *
+ * @author Robert Field
+ */
+public class TTParser extends StringReader {
+
+    private Map<Character, TTNode> letterMap = new HashMap<>();
+    private char ch;
+
+    private final String def;
+
+    public TTParser(String s) {
+        super(s);
+        this.def = s;
+    }
+
+    private void advance() throws IOException {
+        do {
+            ch = (char)read();
+        } while (isWhitespace(ch));
+    }
+
+    public TTNode parse() {
+        try {
+            advance();
+            return classDef();
+        } catch (IOException t) {
+            throw new RuntimeException(t);
+        }
+    }
+
+    private TTNode classDef() throws IOException {
+        if (!isLetter(ch)) {
+            if (ch == (char)-1) {
+                throw new IOException("Unexpected end of type template in " + def);
+            } else {
+                throw new IOException("Unexpected character in type template: " + (Character)ch + " in " + def);
+            }
+        }
+        char nodeCh = ch;
+        TTNode node = letterMap.get(nodeCh);
+        boolean canBeClass = isUpperCase(nodeCh);
+        advance();
+        if (node == null) {
+            List<TTNode> subtypes = new ArrayList<>();
+            if (ch == '(') {
+                advance();
+                while (ch != ')') {
+                    subtypes.add(classDef());
+                }
+                advance();
+            }
+            node = new TTNode(subtypes, canBeClass);
+            letterMap.put(nodeCh, node);
+        }
+        return node;
+    }
+}

test/tools/javac/defaultMethods/fd/shapegen/TTShape.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package shapegen;
+
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/**
+ *
+ * @author Robert Field
+ */
+public class TTShape {
+
+    private final TTNode root;
+    private final TTNode[] nodes;
+
+    TTShape(TTNode root) {
+        this.root = root;
+        Set<TTNode> subs = new HashSet<>();
+        root.collectAllSubtypes(subs);
+        nodes = subs.toArray(new TTNode[subs.size()]);
+    }
+
+    private List<ClassCase> toCases(boolean includeClasses) {
+        List<ClassCase> ccs = new ArrayList<>();
+        root.start(includeClasses);
+        int i;
+        outer:
+        while (true) {
+            if (root.isValid()) {
+                ClassCase cc = root.genCase();
+                //System.out.println(cc);
+                ccs.add(cc);
+            }
+
+            i = 0;
+            do {
+                if (i >= nodes.length) {
+                    break outer;
+                }
+            } while(!nodes[i++].next());
+        }
+        return ccs;
+    }
+
+   public static List<ClassCase> allCases(boolean includeClasses) {
+        List<ClassCase> ccs = new ArrayList<>();
+        for (TTShape shape : SHAPES) {
+            ccs.addAll(shape.toCases(includeClasses));
+        }
+        return ccs;
+    }
+
+    public static TTShape parse(String s) {
+        return new TTShape(new TTParser(s).parse());
+    }
+
+    public static final TTShape[] SHAPES = new TTShape[] {
+        parse("a"),
+        parse("a(b)"),
+        parse("A(bb)"),
+        parse("A(B(d)c(d))"),
+        parse("A(b(c))"),
+        parse("A(B(cd)d)"),
+        parse("A(B(c)c)"),
+        parse("A(B(Ce)d(e))"),
+        parse("A(B(C)d(e))"),
+        parse("A(Bc(d))"),
+        parse("A(B(d)dc)"),
+        parse("A(B(dc)dc)"),
+        parse("A(B(c(d))d)"),
+        parse("A(B(C(d))d)"),
+        parse("A(B(C(e)d(e))e)"),
+        parse("A(B(c(d))c)"),
+        parse("A(B(dc(d))c)"),
+        parse("A(B(C(d))d)"),
+    };
+
+}

test/tools/javac/defaultMethods/separate/Separate.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary smoke test for separate compilation of default methods
+ * @author  Maurizio Cimadamore
+ * @compile -XDallowDefaultMethods pkg1/A.java
+ * @compile -XDallowDefaultMethods Separate.java
+ */
+
+import pkg1.A;
+
+class Separate {
+    interface B extends A.I {
+        default void m() { A.m(this); }
+    }
+
+    interface C extends A.I, B { }
+}

test/tools/javac/defaultMethods/separate/pkg1/A.java

+/*
+ * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package pkg1;
+
+public class A {
+    public interface I {
+        default void m() { A.m(this); }
+    }
+
+    public static void m(Object o) {}
+}

test/tools/javac/defaultMethods/super/TestDefaultSuperCall.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @summary Automatic test for checking correctness of default super/this resolution
+ */
+
+import com.sun.source.util.JavacTask;
+import java.net.URI;
+import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import javax.tools.Diagnostic;
+import javax.tools.JavaCompiler;
+import javax.tools.JavaFileObject;
+import javax.tools.SimpleJavaFileObject;
+import javax.tools.StandardJavaFileManager;
+import javax.tools.ToolProvider;
+
+public class TestDefaultSuperCall {
+
+    static int checkCount = 0;
+
+    enum InterfaceKind {
+        DEFAULT("interface A extends B { default void m() { } }"),
+        ABSTRACT("interface A extends B { void m(); }"),
+        NONE("interface A extends B { }");
+
+        String interfaceStr;
+
+        InterfaceKind(String interfaceStr) {
+            this.interfaceStr = interfaceStr;
+        }
+
+        boolean methodDefined() {
+            return this == DEFAULT;
+        }
+    }
+
+    enum PruneKind {
+        NO_PRUNE("interface C { }"),
+        PRUNE("interface C extends A { }");
+
+        boolean methodDefined(InterfaceKind ik) {
+            return this == PRUNE &&
+                    ik.methodDefined();
+        }
+
+        String interfaceStr;
+
+        PruneKind(String interfaceStr) {
+            this.interfaceStr = interfaceStr;
+        }
+    }
+
+    enum QualifierKind {
+        DIRECT_1("C"),
+        DIRECT_2("A"),
+        INDIRECT("B"),
+        UNRELATED("E"),
+        ENCLOSING_1(null),
+        ENCLOSING_2(null);
+
+        String qualifierStr;
+
+        QualifierKind(String qualifierStr) {
+            this.qualifierStr = qualifierStr;
+        }
+
+        String getQualifier(Shape sh) {
+            switch (this) {
+                case ENCLOSING_1: return sh.enclosingAt(0);
+                case ENCLOSING_2: return sh.enclosingAt(1);
+                default:
+                    return qualifierStr;
+            }
+        }
+
+        boolean isEnclosing() {
+            return this == ENCLOSING_1 ||
+                    this == ENCLOSING_2;
+        }
+
+        boolean allowSuperCall(InterfaceKind ik, PruneKind pk) {
+            switch (this) {
+                case DIRECT_1:
+                    return pk.methodDefined(ik);
+                case DIRECT_2:
+                    return ik.methodDefined() && pk == PruneKind.NO_PRUNE;
+                default:
+                    return false;
+            }
+        }
+    }
+
+    enum ExprKind {
+        THIS("this"),
+        SUPER("super");
+
+        String exprStr;
+
+        ExprKind(String exprStr) {
+            this.exprStr = exprStr;
+        }
+    }
+
+    enum ElementKind {
+        INTERFACE("interface #N { #B }", true),
+        INTERFACE_EXTENDS("interface #N extends A, C { #B }", true),
+        CLASS("class #N { #B }", false),
+        CLASS_EXTENDS("abstract class #N implements A, C { #B }", false),
+        STATIC_CLASS("static class #N { #B }", true),
+        STATIC_CLASS_EXTENDS("abstract static class #N implements A, C { #B }", true),
+        ANON_CLASS("new Object() { #B };", false),
+        METHOD("void test() { #B }", false),
+        STATIC_METHOD("static void test() { #B }", true),
+        DEFAULT_METHOD("default void test() { #B }", false);
+
+        String templateDecl;
+        boolean isStatic;
+
+        ElementKind(String templateDecl, boolean isStatic) {
+            this.templateDecl = templateDecl;
+            this.isStatic = isStatic;
+        }
+
+        boolean isClassDecl() {
+            switch(this) {
+                case METHOD:
+                case STATIC_METHOD:
+                case DEFAULT_METHOD:
+                    return false;
+                default:
+                    return true;
+            }
+        }
+
+        boolean isAllowedEnclosing(ElementKind ek, boolean isTop) {
+            switch (this) {
+                case CLASS:
+                case CLASS_EXTENDS:
+                    //class is implicitly static inside interface, so skip this combo
+                    return ek.isClassDecl() &&
+                            ek != INTERFACE && ek != INTERFACE_EXTENDS;
+                case ANON_CLASS:
+                    return !ek.isClassDecl();
+                case METHOD:
+                    return ek == CLASS || ek == CLASS_EXTENDS ||
+                            ek == STATIC_CLASS || ek == STATIC_CLASS_EXTENDS ||
+                            ek == ANON_CLASS;
+                case INTERFACE:
+                case INTERFACE_EXTENDS:
+                case STATIC_CLASS:
+                case STATIC_CLASS_EXTENDS:
+                case STATIC_METHOD:
+                    return (isTop && (ek == CLASS || ek == CLASS_EXTENDS)) ||
+                            ek == STATIC_CLASS || ek == STATIC_CLASS_EXTENDS;
+                case DEFAULT_METHOD:
+                    return ek == INTERFACE || ek == INTERFACE_EXTENDS;
+                default:
+                    throw new AssertionError("Bad enclosing element kind" + this);
+            }
+        }
+
+        boolean isAllowedTop() {
+            switch (this) {
+                case CLASS:
+                case CLASS_EXTENDS:
+                case INTERFACE:
+                case INTERFACE_EXTENDS:
+                    return true;
+                default:
+                    return false;
+            }
+        }
+
+        boolean hasSuper() {
+            return this == INTERFACE_EXTENDS ||
+                    this == STATIC_CLASS_EXTENDS ||
+                    this == CLASS_EXTENDS;
+        }
+    }
+
+    static class Shape {
+
+        String shapeStr;
+        List<ElementKind> enclosingElements;
+        List<String> enclosingNames;
+        List<String> elementsWithMethod;
+
+        Shape(ElementKind... elements) {
+            System.err.println("elements = " + Arrays.toString(elements));
+            enclosingElements = new ArrayList<>();
+            enclosingNames = new ArrayList<>();
+            elementsWithMethod = new ArrayList<>();
+            int count = 0;
+            String prevName = null;
+            for (ElementKind ek : elements) {
+                String name = "name"+count++;
+                if (ek.isStatic) {
+                    enclosingElements = new ArrayList<>();
+                    enclosingNames = new ArrayList<>();
+                }
+                if (ek.isClassDecl()) {
+                    enclosingElements.add(ek);
+                    enclosingNames.add(name);
+                } else {
+                    elementsWithMethod.add(prevName);
+                }
+                String element = ek.templateDecl.replaceAll("#N", name);
+                shapeStr = shapeStr == null ? element : shapeStr.replaceAll("#B", element);
+                prevName = name;
+            }
+        }
+
+        String getShape(QualifierKind qk, ExprKind ek) {
+            String methName = ek == ExprKind.THIS ? "test" : "m";
+            String call = qk.getQualifier(this) + "." + ek.exprStr + "." + methName + "();";
+            return shapeStr.replaceAll("#B", call);
+        }
+
+        String enclosingAt(int index) {
+            return index < enclosingNames.size() ? enclosingNames.get(index) : "BAD";
+        }
+    }
+
+    public static void main(String... args) throws Exception {
+
+        //create default shared JavaCompiler - reused across multiple compilations
+        JavaCompiler comp = ToolProvider.getSystemJavaCompiler();
+        StandardJavaFileManager fm = comp.getStandardFileManager(null, null, null);
+
+        for (InterfaceKind ik : InterfaceKind.values()) {
+            for (PruneKind pk : PruneKind.values()) {
+                for (ElementKind ek1 : ElementKind.values()) {
+                    if (!ek1.isAllowedTop()) continue;
+                    for (ElementKind ek2 : ElementKind.values()) {
+                        if (!ek2.isAllowedEnclosing(ek1, true)) continue;
+                        for (ElementKind ek3 : ElementKind.values()) {
+                            if (!ek3.isAllowedEnclosing(ek2, false)) continue;
+                            for (ElementKind ek4 : ElementKind.values()) {
+                                if (!ek4.isAllowedEnclosing(ek3, false)) continue;
+                                for (ElementKind ek5 : ElementKind.values()) {
+                                    if (!ek5.isAllowedEnclosing(ek4, false) || ek5.isClassDecl()) continue;
+                                    for (QualifierKind qk : QualifierKind.values()) {
+                                        for (ExprKind ek : ExprKind.values()) {
+                                            new TestDefaultSuperCall(ik, pk, new Shape(ek1, ek2, ek3, ek4, ek5), qk, ek).run(comp, fm);
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        System.out.println("Total check executed: " + checkCount);
+    }
+
+    InterfaceKind ik;
+    PruneKind pk;
+    Shape sh;
+    QualifierKind qk;
+    ExprKind ek;
+    JavaSource source;
+    DiagnosticChecker diagChecker;
+
+    TestDefaultSuperCall(InterfaceKind ik, PruneKind pk, Shape sh, QualifierKind qk, ExprKind ek) {
+        this.ik = ik;
+        this.pk = pk;
+        this.sh = sh;
+        this.qk = qk;
+        this.ek = ek;
+        this.source = new JavaSource();
+        this.diagChecker = new DiagnosticChecker();
+    }
+
+    class JavaSource extends SimpleJavaFileObject {
+
+        String template = "interface E {}\n" +
+                          "interface B { }\n" +
+                          "#I\n" +
+                          "#P\n" +
+                          "#C";
+
+        String source;
+
+        public JavaSource() {
+            super(URI.create("myfo:/Test.java"), JavaFileObject.Kind.SOURCE);
+            source = template.replaceAll("#I", ik.interfaceStr)
+                    .replaceAll("#P", pk.interfaceStr)
+                    .replaceAll("#C", sh.getShape(qk, ek));
+        }
+
+        @Override
+        public CharSequence getCharContent(boolean ignoreEncodingErrors) {
+            return source;
+        }
+    }
+
+    void run(JavaCompiler tool, StandardJavaFileManager fm) throws Exception {
+        JavacTask ct = (JavacTask)tool.getTask(null, fm, diagChecker,
+                Arrays.asList("-XDallowDefaultMethods"), null, Arrays.asList(source));
+        try {
+            ct.analyze();
+        } catch (Throwable ex) {
+            throw new AssertionError("Error thrown when analyzing the following source:\n" + source.getCharContent(true));
+        }
+        check();
+    }
+
+    void check() {
+        boolean errorExpected = false;
+
+        boolean badEnclosing = false;
+        boolean badThis = false;
+        boolean badSuper = false;
+
+        if (qk == QualifierKind.ENCLOSING_1 &&
+                sh.enclosingNames.size() < 1) {
+            errorExpected |= true;
+            badEnclosing = true;
+        }
+
+        if (qk == QualifierKind.ENCLOSING_2 &&
+                sh.enclosingNames.size() < 2) {
+            errorExpected |= true;
+            badEnclosing = true;
+        }
+
+        if (ek == ExprKind.THIS) {
+            boolean found = false;
+            for (int i = 0; i < sh.enclosingElements.size(); i++) {
+                if (sh.enclosingElements.get(i) == ElementKind.ANON_CLASS) continue;
+                if (sh.enclosingNames.get(i).equals(qk.getQualifier(sh))) {
+                    found = sh.elementsWithMethod.contains(sh.enclosingNames.get(i));
+                    break;
+                }
+            }
+            errorExpected |= !found;
+            if (!found) {
+                badThis = true;
+            }
+        }
+
+        if (ek == ExprKind.SUPER) {
+
+            int lastIdx = sh.enclosingElements.size() - 1;
+            boolean found = lastIdx == -1 ? false :
+                    sh.enclosingElements.get(lastIdx).hasSuper() && qk.allowSuperCall(ik, pk);
+
+            errorExpected |= !found;
+            if (!found) {
+                badSuper = true;
+            }
+        }
+
+        checkCount++;
+        if (diagChecker.errorFound != errorExpected) {
+            throw new AssertionError("Problem when compiling source:\n" + source.getCharContent(true) +
+                    "\nenclosingElems: " + sh.enclosingElements +
+                    "\nenclosingNames: " + sh.enclosingNames +
+                    "\nelementsWithMethod: " + sh.elementsWithMethod +
+                    "\nbad encl: " + badEnclosing +
+                    "\nbad this: " + badThis +
+                    "\nbad super: " + badSuper +
+                    "\nqual kind: " + qk +
+                    "\nfound error: " + diagChecker.errorFound);
+        }
+    }
+
+    static class DiagnosticChecker implements javax.tools.DiagnosticListener<JavaFileObject> {
+
+        boolean errorFound;
+
+        public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
+            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
+                System.err.println(diagnostic.getMessage(Locale.getDefault()));
+                errorFound = true;
+            }
+        }
+    }
+}

test/tools/javac/diags/examples/DefaultOverridesObjectMember.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// key: compiler.err.default.overrides.object.member
+// options: -XDallowDefaultMethods
+
+interface DefaultOverridesObjectMember {
+    default String toString() { return ""; }
+}

test/tools/javac/diags/examples/OverriddenDefault.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// key: compiler.err.illegal.default.super.call
+// key: compiler.misc.overridden.default
+// options: -XDallowDefaultMethods
+
+class OverriddenDefault {
+    interface I { default void m() {  } }
+    interface J extends I { default void m() {  } }
+    interface K extends I {}
+
+    static class C implements J, K {
+        void foo() { K.super.m(); }
+    }
+}
\ No newline at end of file

test/tools/javac/diags/examples/RedundantSupertype.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// key: compiler.err.illegal.default.super.call
+// key: compiler.misc.redundant.supertype
+// options: -XDallowDefaultMethods
+
+class RedundantSupertype {
+    interface I { default void m() {  } }
+    interface J extends I { default void m() {  } }
+
+    static class C implements I, J {
+        void foo() { I.super.m(); }
+    }
+}

test/tools/javac/diags/examples/TypesIncompatibleAbstractDefault.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// key: compiler.err.types.incompatible.abstract.default
+// options: -XDallowDefaultMethods
+
+class TypesIncompatibleAbstractDefault {
+    interface A {
+        default void m() { }
+    }
+
+    interface B {
+        void m();
+    }
+
+    interface AB extends A, B { }
+}

test/tools/javac/diags/examples/TypesIncompatibleUnrelatedDefaults.java

+/*
+ * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+// key: compiler.err.types.incompatible.unrelated.defaults
+// options: -XDallowDefaultMethods
+
+class TypesIncompatibleUnrelatedDefaults {
+    interface A {
+        default void m() { }
+    }
+
+    interface B {
+        default void m() { }
+    }
+
+    interface AB extends A, B { }
+}

test/tools/javac/generics/7022054/T7022054pos1.java

@@ -26,7 +26,8 @@
  * @bug 7022054
  *
  * @summary  Invalid compiler error on covariant overriding methods with the same erasure
- * @compile T7022054pos1.java
+ * @compile -source 7 T7022054pos1.java
+ * @compile/fail -XDstrictMethodClashCheck T7022054pos1.java
  *
  */
 

test/tools/javac/generics/7022054/T7022054pos2.java

@@ -26,8 +26,8 @@
  * @bug 7022054
  *
  * @summary  Invalid compiler error on covariant overriding methods with the same erasure
- * @compile T7022054pos2.java
- *
+ * @compile -source 7 T7022054pos2.java
+ * @compile/fail -XDstrictMethodClashCheck T7022054pos2.java
  */
 
 class T7022054pos2 {

test/tools/javac/scope/7046348/EagerInterfaceCompletionTest.java

@@ -30,6 +30,7 @@
 import java.io.File;
 import java.net.URI;
 import java.util.Arrays;
+import java.util.List;
 
 import javax.tools.Diagnostic;
 import javax.tools.DiagnosticListener;
@@ -43,13 +44,15 @@ public class EagerInterfaceCompletionTest {
 
     JavaCompiler javacTool;
     File testDir;
+    VersionKind versionKind;
     HierarchyKind hierarchyKind;
     TestKind testKind;
     ActionKind actionKind;
 
-    EagerInterfaceCompletionTest(JavaCompiler javacTool, File testDir,
+    EagerInterfaceCompletionTest(JavaCompiler javacTool, File testDir, VersionKind versionKind,
             HierarchyKind hierarchyKind, TestKind testKind, ActionKind actionKind) {
         this.javacTool = javacTool;
+        this.versionKind = versionKind;
         this.hierarchyKind = hierarchyKind;
         this.testDir = testDir;
         this.testKind = testKind;
@@ -62,7 +65,7 @@ public class EagerInterfaceCompletionTest {
         actionKind.doAction(this);
         DiagnosticChecker dc = new DiagnosticChecker();
         compile(dc, testKind.source);
-        if (testKind.completionFailure(actionKind, hierarchyKind) != dc.errorFound) {
+        if (testKind.completionFailure(versionKind, actionKind, hierarchyKind) != dc.errorFound) {
             if (dc.errorFound) {
                 error("Unexpected completion failure" +
                       "\nhierarhcyKind " + hierarchyKind +
@@ -80,7 +83,8 @@ public class EagerInterfaceCompletionTest {
     void compile(DiagnosticChecker dc, JavaSource... sources) {
         try {
             CompilationTask ct = javacTool.getTask(null, null, dc,
-                    Arrays.asList("-d", testDir.getAbsolutePath(), "-cp", testDir.getAbsolutePath()),
+                    Arrays.asList("-d", testDir.getAbsolutePath(), "-cp",
+                    testDir.getAbsolutePath(), versionKind.optsArr[0], versionKind.optsArr[1]),
                     null, Arrays.asList(sources));
             ct.call();
         }
@@ -108,12 +112,25 @@ public class EagerInterfaceCompletionTest {
         boolean errorFound = false;
 
         public void report(Diagnostic<? extends JavaFileObject> diagnostic) {
-            errorFound = true;
+            if (diagnostic.getKind() == Diagnostic.Kind.ERROR) {
+                errorFound = true;
+            }
         }
     }
 
     //global declarations
 
+    enum VersionKind {
+        PRE_LAMBDA("-source", "7"),
+        LAMBDA("-source", "8");
+
+        String[] optsArr;
+
+        VersionKind(String... optsArr) {
+            this.optsArr = optsArr;
+        }
+    }
+
     enum HierarchyKind {
         INTERFACE("interface A { boolean f = false; void m(); }\n" +
                   "class B implements A { public void m() {} }"),
@@ -157,13 +174,14 @@ public class EagerInterfaceCompletionTest {
             this.source = new JavaSource("Test2.java", code);
         }
 
-        boolean completionFailure(ActionKind ak, HierarchyKind hk) {
+        boolean completionFailure(VersionKind vk, ActionKind ak, HierarchyKind hk) {
             switch (this) {
                 case ACCESS_ONLY:
                 case CONSTR: return ak == ActionKind.REMOVE_B;
                 case FIELD:
                 case SUPER: return true;
-                case METHOD: return hk != HierarchyKind.INTERFACE || ak == ActionKind.REMOVE_B;
+                case METHOD: return hk != HierarchyKind.INTERFACE || ak == ActionKind.REMOVE_B ||
+                        (hk == HierarchyKind.INTERFACE && ak == ActionKind.REMOVE_A && vk == VersionKind.LAMBDA);
                 default: throw new AssertionError("Unexpected test kind " + this);
             }
         }
@@ -173,12 +191,15 @@ public class EagerInterfaceCompletionTest {
         String SCRATCH_DIR = System.getProperty("user.dir");
         JavaCompiler javacTool = ToolProvider.getSystemJavaCompiler();
         int n = 0;
-        for (HierarchyKind hierarchyKind : HierarchyKind.values()) {
-            for (TestKind testKind : TestKind.values()) {
-                for (ActionKind actionKind : ActionKind.values()) {
-                    File testDir = new File(SCRATCH_DIR, "test"+n);
-                    new EagerInterfaceCompletionTest(javacTool, testDir, hierarchyKind, testKind, actionKind).test();
-                    n++;
+        for (VersionKind versionKind : VersionKind.values()) {
+            for (HierarchyKind hierarchyKind : HierarchyKind.values()) {
+                for (TestKind testKind : TestKind.values()) {
+                    for (ActionKind actionKind : ActionKind.values()) {
+                        File testDir = new File(SCRATCH_DIR, "test"+n);
+                        new EagerInterfaceCompletionTest(javacTool, testDir, versionKind,
+                                hierarchyKind, testKind, actionKind).test();
+                        n++;
+                    }
                 }
             }
         }