Track field types.

src/property.cc

Index: src/property.cc
diff --git a/src/property.cc b/src/property.cc
index 2f72eec48ec6626dd06bde01efc7007920d92d9e..bc193b31a8d769f334e33cad479ac0ed345a812c 100644
--- a/src/property.cc
+++ b/src/property.cc
@@ -25,12 +25,20 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#include "v8.h"
+#include "types.h"
 
 namespace v8 {
 namespace internal {
 
 
+bool LookupResult::CanHoldValue(Handle<Object> value) const {
+  if (IsNormal()) return true;
+  if (!value->FitsRepresentation(details_.representation())) return false;
+  if (!IsField() && !IsTransition()) return true;
+  return HeapType::OfCurrently(value, isolate())->IsCurrently(GetFieldType());
+}
+
+
 void LookupResult::Iterate(ObjectVisitor* visitor) {
   LookupResult* current = this;  // Could be NULL.
   while (current != NULL) {
@@ -119,4 +127,30 @@ void Descriptor::Print(FILE* out) {
 #endif
 
 
+HeapType* LookupResult::GetFieldTypeFromMap(Map* map) const {
+  ASSERT(IsFound());
+  ASSERT(IsField() || IsTransition());
+  return HeapType::cast(GetValueFromMap(map));
+}
+
+
+FieldDescriptor::FieldDescriptor(Name* key,
+                                 int field_index,
+                                 PropertyAttributes attributes,
+                                 Representation representation)
+  : Descriptor(key, HeapType::Any(), attributes, FIELD,
+               representation, field_index) {
+}
+
+
+FieldDescriptor::FieldDescriptor(Name* key,
+                                 int field_index,
+                                 HeapType* field_type,
+                                 PropertyAttributes attributes,
+                                 Representation representation)
+  : Descriptor(key, field_type, attributes, FIELD,
+               representation, field_index) {
+}
+
+
 } }  // namespace v8::internal