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When materializing objects during deoptimization, their fields were
set using Instance::SetField. However, Instance::SetField updates
field guards and it is strict about not taking 'sentinel' value.
That caused assertion to fail when trying to materialize an instances
with late fields which were not initialized yet and have 'sentinel'

Changed materialization to use a more low-level SetFieldAtOffset
in case of sentinel value.

Fixes #45691

Change-Id: If39a1e4f2fc0d0fe7f988a80c7a0073cafff28b0
Commit-Queue: Alexander Markov <>
Reviewed-by: Vyacheslav Egorov <>


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Apr 15, 2021
Apr 8, 2021


A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app.

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.

Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.


Using Dart

Visit to learn more about the language, tools, and to find codelabs.

Browse for more packages and libraries contributed by the community and the Dart team.

Our API reference documentation is published at, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).

Building Dart

If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.

There are more documents on our wiki.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.