Starlarkify ProtoInfo

The Starlark version needs to follow fields as they were exposed on ProtoInfoApi.

The change is slightly confusing, because native fields are sometimes named differently from Starlark ones. Here's the mapping:

Type                | Native field | Starlark field
:------------------ | :--------------------- | :---
Artifact            | directDescriptorSet    | direct_descriptor_set
List<ProtoSource>   | directSources          | _direct_proto_sources (private)
List<Artifact>      | directProtoSources     | direct_sources = extractProtoSources(directSources)
PathFragment        | directProtoSourceRoot  | proto_source_root = directProtoSourceRoot.getSafePathString();
NestedSet<ProtoSource> | transitiveSources   | _transitive_proto_sources (private)
NestedSet<Artifact> | transitiveProtoSources | transitive_imports,  transitive_sources
NestedSet<String>   | transitiveProtoSourceRoots | transitive_proto_path
NestedSet<Artifact> | strictImportableProto-SourcesForDependents | check_deps_sources
NestedSet<Artifact> | transitiveDescriptorSets | transitive_descriptor_sets
NestedSet<ProtoSource> | exportedSources       | _exported_sources (private)

The fields `transitive_imports` and `transitive_sources` are duplicated in Starlark.

Native `directProtoSourceRoot` was interned using `ProtoCommon.memoryEfficientProtoSourceRoot`. There's no optimisation on `proto_source_root`, for now it doesn't seem necessary and I have ideas how to optimise `ProtoInfo` further without it.

The change introduces a slight regression in retained heap on benchmarked builds <0.1%. It's caused because  of extra containers. That is in Starlark each instance needs two references and an Object array, whereas natively there's no need for references or arrays: `StarlarkInfo { ProtoInfo.class, Object[]{ f1, f2 } } > ProtoInfo { f1,f2 }`.

PiperOrigin-RevId: 511854620
Change-Id: I239aef427898e30e4f264f002e79b69eeaaa34db
17 files changed
tree: bae77a7cc9ffc1707939f3a36703e71427537048
  1. .bazelci/
  2. .github/
  3. examples/
  4. scripts/
  5. site/
  6. src/
  7. third_party/
  8. tools/
  9. .bazelrc
  10. .gitattributes
  11. .gitignore
  12. AUTHORS
  13. BUILD
  14. CHANGELOG.md
  15. CODE_OF_CONDUCT.md
  16. CODEOWNERS
  17. combine_distfiles.py
  18. combine_distfiles_to_tar.sh
  19. compile.sh
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. distdir.bzl
  23. distdir_deps.bzl
  24. LICENSE
  25. maven_install.json
  26. MODULE.bazel
  27. README.md
  28. SECURITY.md
  29. WORKSPACE
  30. WORKSPACE.bzlmod
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