Revert "[vm/compiler] Drop redundant initializing stores of null"

This reverts commit 96b8401cfc7554e0cd65980d2dd4537605a538bc.

Reason for revert: works incorrectly because kernel-to-il emits multiple initializing stores for the same field. see language_2/field_parameter
_test

Original change's description:
> [vm/compiler] Drop redundant initializing stores of null
> 
> Dart objects are allocated null-initialized so initializing stores of
> null value can be removed from the graph.
> 
> Issue https://github.com/dart-lang/sdk/issues/38454
> 
> Change-Id: I1ba0c3a21462ba8a3409fc648027b4ebf0b1040e
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118286
> Reviewed-by: Samir Jindel <sjindel@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>
> Commit-Queue: Vyacheslav Egorov <vegorov@google.com>

TBR=vegorov@google.com,kustermann@google.com,sjindel@google.com

Change-Id: Ic0c51986168cb51316d3872514719b34cfc780cb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/118289
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
2 files changed
tree: d8841c8550b9d354573afeb3ed2fea3bf42ac3ca
  1. .github/
  2. benchmarks/
  3. build/
  4. client/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. samples-dev/
  10. sdk/
  11. sdk_nnbd/
  12. tests/
  13. third_party/
  14. tools/
  15. utils/
  16. .clang-format
  17. .gitattributes
  18. .gitconfig
  19. .gitignore
  20. .gn
  21. .mailmap
  22. .packages
  23. .style.yapf
  24. .vpython
  25. AUTHORS
  26. BUILD.gn
  27. CHANGELOG.md
  28. codereview.settings
  29. CONTRIBUTING.md
  30. DEPS
  31. LICENSE
  32. PATENT_GRANT
  33. PRESUBMIT.py
  34. README.dart-sdk
  35. README.md
  36. WATCHLISTS
README.md

Dart

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 has 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.

See LICENSE and PATENT_GRANT.

Using Dart

Visit the dart.dev to learn more about the language, tools, getting started, and more.

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

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.