Add Cast() for Int32 and Uint32

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 617 matching lines @@
   int chars_;  // Caches the number of characters when computing the hash code.
   uint32_t seed_;
 };
 
 
 bool Object::IsNumber() const {
   return IsSmi() || IsHeapNumber();
 }
 
 
+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)
 
 
 bool Object::IsFiller() const {
   if (!Object::IsHeapObject()) return false;
   InstanceType instance_type = HeapObject::cast(this)->map()->instance_type();
   return instance_type == FREE_SPACE_TYPE || instance_type == FILLER_TYPE;
 }
 
@@ skipping 436 matching lines @@
 bool Object::IsFalse() const {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kFalse;
 }
 
 
 bool Object::IsArgumentsMarker() const {
   return IsOddball() && Oddball::cast(this)->kind() == Oddball::kArgumentMarker;
 }
 
 
-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();
 }
 
 
 bool Object::IsNaN() const {
   return this->IsHeapNumber() && std::isnan(HeapNumber::cast(this)->value());
 }
 
 
 bool Object::IsMinusZero() const {
   return this->IsHeapNumber() &&
@@ skipping 6408 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_