diff --git a/src/objects-debug.cc b/src/objects-debug.cc
index 76c520e..2963231 100644
--- a/src/objects-debug.cc
+++ b/src/objects-debug.cc
@@ -88,6 +88,9 @@
     case FIXED_ARRAY_TYPE:
       FixedArray::cast(this)->FixedArrayVerify();
       break;
+    case FIXED_DOUBLE_ARRAY_TYPE:
+      FixedDoubleArray::cast(this)->FixedDoubleArrayVerify();
+      break;
     case BYTE_ARRAY_TYPE:
       ByteArray::cast(this)->ByteArrayVerify();
       break;
@@ -289,6 +292,12 @@
 }
 
 
+void PolymorphicCodeCache::PolymorphicCodeCacheVerify() {
+  VerifyHeapPointer(cache());
+  ASSERT(cache()->IsUndefined() || cache()->IsPolymorphicCodeCacheHashTable());
+}
+
+
 void FixedArray::FixedArrayVerify() {
   for (int i = 0; i < length(); i++) {
     Object* e = get(i);
@@ -301,6 +310,18 @@
 }
 
 
+void FixedDoubleArray::FixedDoubleArrayVerify() {
+  for (int i = 0; i < length(); i++) {
+    if (!is_the_hole(i)) {
+      double value = get(i);
+      ASSERT(!isnan(value) ||
+             (BitCast<uint64_t>(value) ==
+              BitCast<uint64_t>(canonical_not_the_hole_nan_as_double())));
+    }
+  }
+}
+
+
 void JSValue::JSValueVerify() {
   Object* v = value();
   if (v->IsHeapObject()) {
@@ -426,7 +447,9 @@
 void JSArray::JSArrayVerify() {
   JSObjectVerify();
   ASSERT(length()->IsNumber() || length()->IsUndefined());
-  ASSERT(elements()->IsUndefined() || elements()->IsFixedArray());
+  ASSERT(elements()->IsUndefined() ||
+         elements()->IsFixedArray() ||
+         elements()->IsFixedDoubleArray());
 }