Add Cast() for Int32 and Uint32

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 779fd39ef96f9c9b78456d0c22a1cb87efc05a15..2781ccff2e0530643a5d87a1473afefd22bec920 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -635,6 +635,26 @@ bool Object::IsNumber() const {
 }
 
 
+bool Object::IsInt32() const {
+  if (IsSmi()) return true;
+  if (IsNumber()) {
+    return IsInt32Double(Number());
+  }
+  return false;
+}
+
+
+bool Object::IsUint32() const {
+  if (IsSmi()) return Smi::cast(this)->value() >= 0;
+  if (IsNumber()) {
+    double value = Number();
+    return !i::IsMinusZero(value) && value >= 0 && value <= kMaxUInt32 &&
+           value == FastUI2D(i::FastD2UI(value));
+  }
+  return false;
+}
+
+
 TYPE_CHECKER(ByteArray, BYTE_ARRAY_TYPE)
 TYPE_CHECKER(FreeSpace, FREE_SPACE_TYPE)
 
@@ -1091,11 +1111,11 @@ bool Object::IsArgumentsMarker() const {
 }
 
 
-double Object::Number() {
+double Object::Number() const {
   DCHECK(IsNumber());
   return IsSmi()
-    ? static_cast<double>(reinterpret_cast<Smi*>(this)->value())
-    : reinterpret_cast<HeapNumber*>(this)->value();
+             ? static_cast<double>(reinterpret_cast<const Smi*>(this)->value())
+             : reinterpret_cast<const HeapNumber*>(this)->value();
 }