Make internalized string parser in JSON.parse GC-safe

src/factory.h

 // Copyright 2014 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.
 
 #ifndef V8_FACTORY_H_
 #define V8_FACTORY_H_
 
 #include "src/isolate.h"
 
 namespace v8 {
@@ skipping 146 matching lines @@
       PretenureFlag pretenure = NOT_TENURED);
 
   // Allocates an internalized string in old space based on the character
   // stream.
   MUST_USE_RESULT Handle<String> NewInternalizedStringFromUtf8(
       Vector<const char> str,
       int chars,
       uint32_t hash_field);
 
   MUST_USE_RESULT Handle<String> NewOneByteInternalizedString(
-        Vector<const uint8_t> str,
-        uint32_t hash_field);
+      Vector<const uint8_t> str, uint32_t hash_field);
+
+  MUST_USE_RESULT Handle<String> NewOneByteInternalizedSubString(
+      Handle<SeqOneByteString> string, int offset, int length,
+      uint32_t hash_field);
 
   MUST_USE_RESULT Handle<String> NewTwoByteInternalizedString(
         Vector<const uc16> str,
         uint32_t hash_field);
 
   MUST_USE_RESULT Handle<String> NewInternalizedStringImpl(
       Handle<String> string, int chars, uint32_t hash_field);
 
   // Compute the matching internalized string map for a string if possible.
   // Empty handle is returned if string is in new space or not flattened.
@@ skipping 523 matching lines @@
                                  PretenureFlag pretenure = TENURED);
 
   Handle<JSFunction> NewFunction(Handle<Map> map,
                                  Handle<String> name,
                                  MaybeHandle<Code> maybe_code);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_