lit-to-bazel

name	lit-to-bazel
description	Converts MLIR lit test files to `bazel run` commands. Use when you need to convert a failing MLIR lit test target (containing RUN lines) to a shell command whose flags can be modified for further analysis and debugging.

Lit To Bazel

Overview

This skill guides the agent in using the lit_to_bazel tool to convert MLIR test files to executable commands.

Usage

Converting a Test File

To convert a lit test file to a bazel run command, use the following command recipes:

bazel run //third_party/heir/scripts:lit_to_bazel -- {test_file_path}

Replace {test_file_path} with the absolute path to the test file. The absolute path is necessary because the bazel run command runs relative to its runfiles directory, and so a relative path will not be relative to the VCS root of the project.

Gotchas

• Absolute Paths: The tool replaces %s in RUN lines with the absolute path of the test file to ensure it works in the sandbox.
• Piped RUN commands: The tool supports piped RUN lines, such as piping heir-opt into heir-translate.
• Complex RUN commands: Some very complex RUN lines are not supported, such as lit test files with multiple RUN lines that interact via writing to and reading from temporary files. When encountering situations like this, you should stop and warn the user.
• Non-lit tests: Some test targets are not lit tests, and these do not need the lit_to_bazel tool.

Copy this checklist and track progress:

- [ ] Step 1: Identify the test file to convert.
- [ ] Step 2: Run the `lit_to_bazel` tool on the file.
- [ ] Step 3: Inspect the generated command or run it.
- [ ] Step 4: Verify execution results.