Use external byte arrays for token stream, this moves the token stream out of the isolate heap. For…

vm/snapshot_test.cc

 // Copyright (c) 2012, 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 "include/dart_debugger_api.h"
 #include "platform/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_message.h"
@@ skipping 705 matching lines @@
   // Check if the serialized script object matches the original script.
   String& expected_literal = String::Handle();
   String& actual_literal = String::Handle();
   String& str = String::Handle();
   str ^= serialized_script.url();
   EXPECT(url.Equals(str));
 
   const TokenStream& expected_tokens = TokenStream::Handle(script.tokens());
   const TokenStream& serialized_tokens =
       TokenStream::Handle(serialized_script.tokens());
-  EXPECT_EQ(expected_tokens.Length(), serialized_tokens.Length());
+  const ExternalUint8Array& expected_data =
+      ExternalUint8Array::Handle(expected_tokens.GetStream());
+  const ExternalUint8Array& serialized_data =
+      ExternalUint8Array::Handle(serialized_tokens.GetStream());
+  EXPECT_EQ(expected_data.Length(), serialized_data.Length());
   TokenStream::Iterator expected_iterator(expected_tokens, 0);
   TokenStream::Iterator serialized_iterator(serialized_tokens, 0);
   Token::Kind expected_kind = expected_iterator.CurrentTokenKind();
   Token::Kind serialized_kind = serialized_iterator.CurrentTokenKind();
   while (expected_kind != Token::kEOS && serialized_kind != Token::kEOS) {
     EXPECT_EQ(expected_kind, serialized_kind);
     expected_literal ^= expected_iterator.CurrentLiteral();
     actual_literal ^= serialized_iterator.CurrentLiteral();
     EXPECT(expected_literal.Equals(actual_literal));
     expected_iterator.Advance();
@@ skipping 785 matching lines @@
   EXPECT(Dart_ErrorHasException(result));
   EXPECT_SUBSTRING("Exception: nulltruefalse1234563.14[]100123456789\n",
                    Dart_GetError(result));
 
   Dart_ExitScope();
 }
 
 #endif  // defined(TARGET_ARCH_IA32) || defined(TARGET_ARCH_X64).
 
 }  // namespace dart