[runtime] First step to sanitize regexp literal creation.

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 "src/objects.h"
 
 #include <cmath>
 #include <iomanip>
 #include <sstream>
 
@@ skipping 15648 matching lines @@
                                     Handle<String> flags) {
   Isolate* isolate = pattern->GetIsolate();
   Handle<JSFunction> constructor = isolate->regexp_function();
   Handle<JSRegExp> regexp =
       Handle<JSRegExp>::cast(isolate->factory()->NewJSObject(constructor));
 
   return JSRegExp::Initialize(regexp, pattern, flags);
 }
 
 
+// static
+Handle<JSRegExp> JSRegExp::Copy(Handle<JSRegExp> regexp) {
+  Isolate* const isolate = regexp->GetIsolate();
+  return Handle<JSRegExp>::cast(isolate->factory()->CopyJSObject(regexp));
+}
+
+
 static JSRegExp::Flags RegExpFlagsFromString(Handle<String> flags,
                                              bool* success) {
   uint32_t value = JSRegExp::NONE;
   int length = flags->length();
   // A longer flags string cannot be valid.
   if (length > 5) return JSRegExp::Flags(0);
   for (int i = 0; i < length; i++) {
     uint32_t flag = JSRegExp::NONE;
     switch (flags->Get(i)) {
       case 'g':
@@ skipping 2862 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