remove undetectable strings

src/objects.cc

 // Copyright 2013 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 <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 9151 matching lines @@
                                       one_length);
   } else {
     for (int i = 0; i < one_length; i++) {
       if (flat1.Get(i) != flat2.Get(i)) return false;
     }
     return true;
   }
 }
 
 
-bool String::MarkAsUndetectable() {
-  if (StringShape(this).IsInternalized()) return false;
-
-  Map* map = this->map();
-  Heap* heap = GetHeap();
-  if (map == heap->string_map()) {
-    this->set_map(heap->undetectable_string_map());
-    return true;
-  } else if (map == heap->one_byte_string_map()) {
-    this->set_map(heap->undetectable_one_byte_string_map());
-    return true;
-  }
-  // Rest cannot be marked as undetectable
-  return false;
-}
-
-
 bool String::IsUtf8EqualTo(Vector<const char> str, bool allow_prefix_match) {
   int slen = length();
   // Can't check exact length equality, but we can check bounds.
   int str_len = str.length();
   if (!allow_prefix_match &&
       (str_len < slen ||
           str_len > slen*static_cast<int>(unibrow::Utf8::kMaxEncodedSize))) {
     return false;
   }
   int i;
@@ skipping 7741 matching lines @@
   Handle<DependentCode> codes =
       DependentCode::Insert(handle(cell->dependent_code(), info->isolate()),
                             DependentCode::kPropertyCellChangedGroup,
                             info->object_wrapper());
   if (*codes != cell->dependent_code()) cell->set_dependent_code(*codes);
   info->dependencies(DependentCode::kPropertyCellChangedGroup)->Add(
       cell, info->zone());
 }
 
 } }  // namespace v8::internal