Refactor unboxed fields in preparation of reusable SIMD boxes

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 2169 matching lines @@
   void set_guarded_list_length(intptr_t list_length) const;
   static intptr_t guarded_list_length_offset() {
     return OFFSET_OF(RawField, guarded_list_length_);
   }
   bool needs_length_check() const {
     const bool r = guarded_list_length() >= Field::kUnknownFixedLength;
     ASSERT(!r || is_final());
     return r;
   }
 
-  bool IsUnboxedField() const {
-    return is_unboxing_candidate()
-        && !is_final()
-        && (guarded_cid() == kDoubleCid && !is_nullable());
+  intptr_t UnboxedFieldCid() const {
+    ASSERT(IsUnboxedField());
+    return guarded_cid();
   }
 
-  bool IsPotentialUnboxedField() const {
-    return is_unboxing_candidate()
-        && (IsUnboxedField() ||
-            (!is_final() && (guarded_cid() == kIllegalCid)));
-  }
+  bool IsUnboxedField() const;
+
+  bool IsPotentialUnboxedField() const;
 
   bool is_unboxing_candidate() const {
     return UnboxingCandidateBit::decode(raw_ptr()->kind_bits_);
   }
   void set_is_unboxing_candidate(bool b) const {
     set_kind_bits(UnboxingCandidateBit::update(b, raw_ptr()->kind_bits_));
   }
 
   static bool IsExternalizableCid(intptr_t cid) {
     return (cid == kOneByteStringCid) || (cid == kTwoByteStringCid);
@@ skipping 4449 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_