Clean up nullability in the CommandEnvironment#pendingException field's value.

Distinguish between pendingException being unset, being set to a dummy value by #precompleteCommand, and being set to a not-dummy value BlazeModuleEnvironment#exit. Commit 54c9f1 inadvertently got rid of this distinction, since it disallowed the AbruptExitException ctor taking in a null ExitCode.

This distinction is potentially relevant for CommandEnvironment#getPendingExitCode. In this change here, I made that method private and cleaned up its usage.

The distinction was added pretty early in the history of Bazel in commit 6e5e8f. It didn't actually matter in the codebase back then, and it still doesn't now, because BuildTool#processRequest is called *before* CommandEnvironment#precompleteCommand (see the consecutive lines in BlazeCommandDispatcher...), but let's not make the code brittle in the face of future changes. I also wanted to save future code readers time; I spent ~10 mins convincing myself that the code was "correct" today.

RELNOTES: None
PiperOrigin-RevId: 303968383
2 files changed
tree: 7672065a6ef8c86b72193338450cb9ea3d68477a
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .bazelrc
  9. .gitattributes
  10. .gitignore
  11. AUTHORS
  12. BUILD
  13. CHANGELOG.md
  14. CODEOWNERS
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. CONTRIBUTING.md
  19. CONTRIBUTORS
  20. distdir.bzl
  21. ISSUE_TEMPLATE.md
  22. LICENSE
  23. README.md
  24. WORKSPACE
README.md

Bazel

{Fast, Correct} - Choose two

Build and test software of any size, quickly and reliably.

  • Speed up your builds and tests: Bazel rebuilds only what is necessary. With advanced local and distributed caching, optimized dependency analysis and parallel execution, you get fast and incremental builds.

  • One tool, multiple languages: Build and test Java, C++, Android, iOS, Go, and a wide variety of other language platforms. Bazel runs on Windows, macOS, and Linux.

  • Scalable: Bazel helps you scale your organization, codebase, and continuous integration solution. It handles codebases of any size, in multiple repositories or a huge monorepo.

  • Extensible to your needs: Easily add support for new languages and platforms with Bazel's familiar extension language. Share and re-use language rules written by the growing Bazel community.

Getting Started

Documentation

Contributing to Bazel

See CONTRIBUTING.md

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