[elements] Precisely estimate elements size for large-object limits

src/objects.cc

 // Copyright 2015 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.
 
 #include "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 8107 matching lines @@
                        ? Smi::cast(JSArray::cast(object)->length())->value()
                        : object->elements()->length();
       return length > 0;
     }
     case FAST_HOLEY_SMI_ELEMENTS:
     case FAST_HOLEY_ELEMENTS: {
       FixedArray* elements = FixedArray::cast(object->elements());
       int length = object->IsJSArray()
                        ? Smi::cast(JSArray::cast(object)->length())->value()
                        : elements->length();
+      Isolate* isolate = GetIsolate();
       for (int i = 0; i < length; i++) {
-        if (!elements->is_the_hole(i)) return true;
+        if (!elements->is_the_hole(isolate, i)) return true;
       }
       return false;
     }
     case FAST_HOLEY_DOUBLE_ELEMENTS: {
       int length = object->IsJSArray()
                        ? Smi::cast(JSArray::cast(object)->length())->value()
                        : object->elements()->length();
       // Zero-length arrays would use the empty FixedArray...
       if (length == 0) return false;
       // ...so only cast to FixedDoubleArray otherwise.
@@ skipping 7150 matching lines @@
                                         uint32_t index) {
   uint32_t length = 0;
   CHECK(array->length()->ToArrayLength(&length));
   if (length <= index) return HasReadOnlyLength(array);
   return false;
 }
 
 
 template <typename BackingStore>
 static int FastHoleyElementsUsage(JSObject* object, BackingStore* store) {
+  Isolate* isolate = store->GetIsolate();
   int limit = object->IsJSArray()
                   ? Smi::cast(JSArray::cast(object)->length())->value()
                   : store->length();
   int used = 0;
   for (int i = 0; i < limit; ++i) {
-    if (!store->is_the_hole(i)) ++used;
+    if (!store->is_the_hole(isolate, i)) ++used;
   }
   return used;
 }
 
 
 int JSObject::GetFastElementsUsage() {
   FixedArrayBase* store = elements();
   switch (GetElementsKind()) {
     case FAST_SMI_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
@@ skipping 3470 matching lines @@
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 
 }  // namespace internal
 }  // namespace v8