Thread/Isolate refactoring: new(Isolate) -> new(Zone)

runtime/lib/string.cc

 // Copyright (c) 2011, 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.
 
 #include "vm/bootstrap_natives.h"
 
 #include "include/dart_api.h"
 #include "vm/exceptions.h"
 #include "vm/dart_api_impl.h"
 #include "vm/isolate.h"
@@ skipping 39 matching lines @@
   intptr_t start = start_obj.Value();
   if ((start < 0) || (start > length)) {
     Exceptions::ThrowArgumentError(start_obj);
   }
 
   intptr_t end = end_obj.Value();
   if ((end < start) || (end > length)) {
     Exceptions::ThrowArgumentError(end_obj);
   }
 
-  Zone* zone = isolate->current_zone();
-
   // Unbox the array and determine the maximum element width.
   bool is_one_byte_string = true;
   intptr_t array_len = end - start;
   intptr_t utf16_len = array_len;
   int32_t* utf32_array = zone->Alloc<int32_t>(array_len);
   Instance& index_object = Instance::Handle(isolate);
   for (intptr_t i = 0; i < array_len; i++) {
     index_object ^= a.At(start + i);
     if (!index_object.IsSmi()) {
       Exceptions::ThrowArgumentError(index_object);
@@ skipping 537 matching lines @@
       ? String::Handle(OneByteString::New(length_value, Heap::kNew))
       : String::Handle(TwoByteString::New(length_value, Heap::kNew));
   NoGCScope no_gc;
 
   uint16_t* data_position = reinterpret_cast<uint16_t*>(codeUnits.DataAddr(0));
   String::Copy(result, 0, data_position, length_value);
   return result.raw();
 }
 
 }  // namespace dart