Revert "[vm] Allocate old in object-graph-copy's slow path."

This reverts commit d0a60d67c9820d0a146f48adf0c1111b87e840f8.

Reason for revert: Slow path transition seems to occur earlier than I expected

Original change's description:
> [vm] Allocate old in object-graph-copy's slow path.
> If we have reached the slow path, the message's subgraph is very likely to be large.
> TEST=ci
> Change-Id: Ie8a18c78936ae8a53f30dd61da3650e684c09dfa
> Reviewed-on:
> Commit-Queue: Ryan Macnak <>
> Reviewed-by: Martin Kustermann <>,

Change-Id: I61faddd37e424a742427ae7c270cdb8b0a13c418
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-by: Ryan Macnak <>
Reviewed-by: Siva Annamalai <>
Commit-Queue: Ryan Macnak <>
1 file changed
tree: fc67421656b73690365a467cfb8bed515cc9daa2
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. samples-dev/
  10. samples_2/
  11. sdk/
  12. tests/
  13. third_party/
  14. tools/
  15. utils/
  16. .clang-format
  17. .gitattributes
  18. .gitconfig
  19. .gitignore
  20. .gn
  21. .mailmap
  22. .style.yapf
  23. .vpython
  27. codereview.settings
  29. DEPS
  31. OWNERS
  34. README.dart-sdk
  36. sdk_args.gni


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.