--- a/jdk/src/java.base/share/classes/java/lang/invoke/BoundMethodHandle.java	Wed Sep 10 19:19:51 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/invoke/BoundMethodHandle.java	Wed Sep 10 19:19:51 2014 +0400
@@ -138,7 +138,8 @@
      */
     static BoundMethodHandle makeReinvoker(MethodHandle target) {
         LambdaForm form = DelegatingMethodHandle.makeReinvokerForm(
-                target, MethodTypeForm.LF_REBIND, Species_L.SPECIES_DATA.getterFunction(0) );
+                target, MethodTypeForm.LF_REBIND,
+                Species_L.SPECIES_DATA, Species_L.SPECIES_DATA.getterFunction(0));
         return Species_L.make(target.type(), form, target);
     }
 

--- a/jdk/src/java.base/share/classes/java/lang/invoke/DelegatingMethodHandle.java	Wed Sep 10 19:19:51 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/invoke/DelegatingMethodHandle.java	Wed Sep 10 19:19:51 2014 +0400
@@ -85,12 +85,13 @@
     private static LambdaForm chooseDelegatingForm(MethodHandle target) {
         if (target instanceof SimpleMethodHandle)
             return target.internalForm();  // no need for an indirection
-        return makeReinvokerForm(target, MethodTypeForm.LF_DELEGATE, NF_getTarget);
+        return makeReinvokerForm(target, MethodTypeForm.LF_DELEGATE, DelegatingMethodHandle.class, NF_getTarget);
     }
 
     /** Create a LF which simply reinvokes a target of the given basic type. */
     static LambdaForm makeReinvokerForm(MethodHandle target,
                                         int whichCache,
+                                        Object constraint,
                                         NamedFunction getTargetFn) {
         MethodType mtype = target.type().basicType();
         boolean customized = (whichCache < 0 ||
@@ -108,6 +109,7 @@
         final int REINVOKE    = nameCursor++;
         LambdaForm.Name[] names = LambdaForm.arguments(nameCursor - ARG_LIMIT, mtype.invokerType());
         assert(names.length == nameCursor);
+        names[THIS_DMH] = names[THIS_DMH].withConstraint(constraint);
         Object[] targetArgs;
         if (customized) {
             targetArgs = Arrays.copyOfRange(names, ARG_BASE, ARG_LIMIT, Object[].class);

--- a/jdk/src/java.base/share/classes/java/lang/invoke/Invokers.java	Wed Sep 10 19:19:51 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/invoke/Invokers.java	Wed Sep 10 19:19:51 2014 +0400
@@ -260,7 +260,9 @@
                 : Arrays.asList(mtype, customized, which, nameCursor, names.length);
         if (MTYPE_ARG >= INARG_LIMIT) {
             assert(names[MTYPE_ARG] == null);
-            NamedFunction getter = BoundMethodHandle.speciesData_L().getterFunction(0);
+            BoundMethodHandle.SpeciesData speciesData = BoundMethodHandle.speciesData_L();
+            names[THIS_MH] = names[THIS_MH].withConstraint(speciesData);
+            NamedFunction getter = speciesData.getterFunction(0);
             names[MTYPE_ARG] = new Name(getter, names[THIS_MH]);
             // else if isLinker, then MTYPE is passed in from the caller (e.g., the JVM)
         }

--- a/jdk/src/java.base/share/classes/java/lang/invoke/LambdaForm.java	Wed Sep 10 19:19:51 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/invoke/LambdaForm.java	Wed Sep 10 19:19:51 2014 +0400
@@ -460,6 +460,11 @@
         return param;
     }
 
+    /** Report the N-th argument type constraint. */
+    Object parameterConstraint(int n) {
+        return parameter(n).constraint;
+    }
+
     /** Report the arity. */
     int arity() {
         return arity;
@@ -1421,6 +1426,7 @@
         final BasicType type;
         private short index;
         final NamedFunction function;
+        final Object constraint;  // additional type information, if not null
         @Stable final Object[] arguments;
 
         private Name(int index, BasicType type, NamedFunction function, Object[] arguments) {
@@ -1428,8 +1434,18 @@
             this.type = type;
             this.function = function;
             this.arguments = arguments;
+            this.constraint = null;
             assert(this.index == index);
         }
+        private Name(Name that, Object constraint) {
+            this.index = that.index;
+            this.type = that.type;
+            this.function = that.function;
+            this.arguments = that.arguments;
+            this.constraint = constraint;
+            assert(constraint == null || isParam());  // only params have constraints
+            assert(constraint == null || constraint instanceof BoundMethodHandle.SpeciesData || constraint instanceof Class);
+        }
         Name(MethodHandle function, Object... arguments) {
             this(new NamedFunction(function), arguments);
         }
@@ -1477,7 +1493,11 @@
         }
         Name cloneWithIndex(int i) {
             Object[] newArguments = (arguments == null) ? null : arguments.clone();
-            return new Name(i, type, function, newArguments);
+            return new Name(i, type, function, newArguments).withConstraint(constraint);
+        }
+        Name withConstraint(Object constraint) {
+            if (constraint == this.constraint)  return this;
+            return new Name(this, constraint);
         }
         Name replaceName(Name oldName, Name newName) {  // FIXME: use replaceNames uniformly
             if (oldName == newName)  return this;
@@ -1557,7 +1577,12 @@
             return (function == null) ? s : s + "=" + exprString();
         }
         public String paramString() {
-            return toString();
+            String s = toString();
+            Object c = constraint;
+            if (c == null)
+                return s;
+            if (c instanceof Class)  c = ((Class<?>)c).getSimpleName();
+            return s + "/" + c;
         }
         public String exprString() {
             if (function == null)  return toString();
@@ -1679,6 +1704,7 @@
     static Name internArgument(Name n) {
         assert(n.isParam()) : "not param: " + n;
         assert(n.index < INTERNED_ARGUMENT_LIMIT);
+        if (n.constraint != null)  return n;
         return argument(n.index, n.type);
     }
     static Name[] arguments(int extra, String types) {

--- a/jdk/src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java	Wed Sep 10 19:19:51 2014 +0400
+++ b/jdk/src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java	Wed Sep 10 19:19:51 2014 +0400
@@ -710,6 +710,7 @@
         Name[] names = arguments(nameCursor - ARG_LIMIT, lambdaType);
 
         BoundMethodHandle.SpeciesData data = BoundMethodHandle.speciesData_LLLLL();
+        names[THIS_MH]          = names[THIS_MH].withConstraint(data);
         names[GET_TARGET]       = new Name(data.getterFunction(0), names[THIS_MH]);
         names[GET_CLASS]        = new Name(data.getterFunction(1), names[THIS_MH]);
         names[GET_CATCHER]      = new Name(data.getterFunction(2), names[THIS_MH]);