--- old/src/java.base/share/classes/java/lang/invoke/LambdaForm.java	2015-01-22 20:49:31.000000000 +0300
+++ new/src/java.base/share/classes/java/lang/invoke/LambdaForm.java	2015-01-22 20:49:31.000000000 +0300
@@ -120,6 +120,7 @@
     final int arity;
     final int result;
     final boolean forceInline;
+    final MethodHandle customized;
     @Stable final Name[] names;
     final String debugName;
     MemberName vmentry;   // low-level behavior, or null if not yet prepared
@@ -244,16 +245,17 @@
 
     LambdaForm(String debugName,
                int arity, Name[] names, int result) {
-        this(debugName, arity, names, result, /*forceInline=*/true);
+        this(debugName, arity, names, result, /*forceInline=*/true, /*customized=*/null);
     }
     LambdaForm(String debugName,
-               int arity, Name[] names, int result, boolean forceInline) {
+               int arity, Name[] names, int result, boolean forceInline, MethodHandle customized) {
         assert(namesOK(arity, names));
         this.arity = arity;
         this.result = fixResult(result, names);
         this.names = names.clone();
         this.debugName = fixDebugName(debugName);
         this.forceInline = forceInline;
+        this.customized = customized;
         int maxOutArity = normalize();
         if (maxOutArity > MethodType.MAX_MH_INVOKER_ARITY) {
             // Cannot use LF interpreter on very high arity expressions.
@@ -263,21 +265,21 @@
     }
     LambdaForm(String debugName,
                int arity, Name[] names) {
-        this(debugName, arity, names, LAST_RESULT, /*forceInline=*/true);
+        this(debugName, arity, names, LAST_RESULT, /*forceInline=*/true, /*customized=*/null);
     }
     LambdaForm(String debugName,
                int arity, Name[] names, boolean forceInline) {
-        this(debugName, arity, names, LAST_RESULT, forceInline);
+        this(debugName, arity, names, LAST_RESULT, forceInline, /*customized=*/null);
     }
     LambdaForm(String debugName,
                Name[] formals, Name[] temps, Name result) {
         this(debugName,
-             formals.length, buildNames(formals, temps, result), LAST_RESULT, /*forceInline=*/true);
+             formals.length, buildNames(formals, temps, result), LAST_RESULT, /*forceInline=*/true, /*customized=*/null);
     }
     LambdaForm(String debugName,
                Name[] formals, Name[] temps, Name result, boolean forceInline) {
         this(debugName,
-             formals.length, buildNames(formals, temps, result), LAST_RESULT, forceInline);
+             formals.length, buildNames(formals, temps, result), LAST_RESULT, forceInline, /*customized=*/null);
     }
 
     private static Name[] buildNames(Name[] formals, Name[] temps, Name result) {
@@ -300,6 +302,7 @@
         this.names = buildEmptyNames(arity, sig);
         this.debugName = "LF.zero";
         this.forceInline = true;
+        this.customized = null;
         assert(nameRefsAreLegal());
         assert(isEmpty());
         assert(sig.equals(basicTypeSignature())) : sig + " != " + basicTypeSignature();
@@ -371,6 +374,27 @@
         return true;
     }
 
+    LambdaForm customize(MethodHandle mh) {
+        LambdaForm customForm = new LambdaForm(debugName, arity, names, result, forceInline, mh);
+        if (COMPILE_THRESHOLD > 0 && isCompiled) {
+            // If shared LambdaForm has been compiled, compile customized version as well.
+            customForm.compileToBytecode();
+        }
+        return customForm;
+    }
+
+    LambdaForm uncustomize() {
+        if (customized == null) {
+            return this;
+        }
+        LambdaForm uncustomizedForm  = new LambdaForm(debugName, arity, names, result, forceInline, null);
+        if (COMPILE_THRESHOLD > 0 && isCompiled) {
+            // If customized LambdaForm has been compiled, compile uncustomized version as well.
+            uncustomizedForm.compileToBytecode();
+        }
+        return uncustomizedForm;
+    }
+
     /** Renumber and/or replace params so that they are interned and canonically numbered.
      *  @return maximum argument list length among the names (since we have to pass over them anyway)
      */
@@ -413,8 +437,8 @@
             for (int i = arity; i < names.length; i++) {
                 names[i].internArguments();
             }
-            assert(nameRefsAreLegal());
         }
+        assert(nameRefsAreLegal());
         return maxOutArity;
     }