Track field types.

src/property.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (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) {
     visitor->VisitPointer(BitCast<Object**>(&current->holder_));
     visitor->VisitPointer(BitCast<Object**>(&current->transition_));
     current = current->next_;
   }
 }
 
 
@@ skipping 68 matching lines @@
   PrintF(out, "Descriptor ");
   GetKey()->ShortPrint(out);
   PrintF(out, " @ ");
   GetValue()->ShortPrint(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