llvm-19.yml

name: Test workflow with LLVM 19

on:
  push:
    branches:
    - llvm19
  workflow_dispatch:

env:
  MCDC_HOME: /home/github-runner/mcdc-workdir

jobs:
  find_runner:
    name: Find an available self-hosted runner
    runs-on: self-hosted
    # Enforce this same runner for all later jobs that depend on this one
    # FIXME this requires each runner has a label the same as its name
    outputs:
      runner_name: ${{ runner.name }}
    # Dummy, do nothing
    steps:
    - uses: actions/checkout@v4

  install_deps:
    name: 1. Install dependencies
    needs: find_runner
    # Enforce the same runner
    runs-on: ${{ needs.find_runner.outputs.runner_name }}
    outputs:
      runner_name: ${{ runner.name }}
    steps:
    - uses: actions/checkout@v4
    - name: Install dependencies
      run: ./ci/1_install_deps.sh

  pull_source:
    name: 2. Pull the source code and apply patches
    needs: install_deps
    # Enforce the same runner
    runs-on: ${{ needs.install_deps.outputs.runner_name }}
    outputs:
      runner_name: ${{ runner.name }}
    steps:
    - uses: actions/checkout@v4
    - name: Create a workspace from clean slate
      run: |
        rm -rf $MCDC_HOME
        mkdir -p $MCDC_HOME
    - name: Pull the source code and apply patches
      run: ./ci/2_pull_source.sh

  get_llvm:
    name: 3. Get LLVM
    needs: pull_source
    # Enforce the same runner
    runs-on: ${{ needs.pull_source.outputs.runner_name }}
    outputs:
      runner_name: ${{ runner.name }}
    steps:
    - uses: actions/checkout@v4
    - name: Build from source
      run: ./ci/3_get_llvm.sh
    - name: Print LLVM build resource usage
      run: |
        cat /tmp/time.log
        du -sh $MCDC_HOME/llvm-project

  build_kernel:
    name: 4. Build the kernel
    needs: get_llvm
    # Enforce the same runner
    runs-on: ${{ needs.get_llvm.outputs.runner_name }}
    outputs:
      runner_name: ${{ runner.name }}
    steps:
    - uses: actions/checkout@v4
    - name: Set up LLVM path
      run: echo "$MCDC_HOME/llvm-project/build/bin" >> $GITHUB_PATH
    - name: Print toolchain version
      run: |
        clang -v
        llc --version
    - name: Build the kernel
      run: ./ci/4_build_kernel.sh
    - name: Print full kernel build log
      run: cat /tmp/make.log
    - name: Print kernel build resource usage
      run: |
        cat /tmp/time.log
        du -sh $MCDC_HOME/linux
    - name: Print kernel binary layout
      run: |
        llvm-readelf --sections -W $MCDC_HOME/linux/vmlinux

  boot_kernel_and_collect_coverage:
    name: 5. Boot the kernel and collect coverage
    needs: build_kernel
    # Enforce the same runner
    runs-on: ${{ needs.build_kernel.outputs.runner_name }}
    outputs:
      runner_name: ${{ runner.name }}
    steps:
    - uses: actions/checkout@v4
    - name: Set up LLVM path
      run: echo "$MCDC_HOME/llvm-project/build/bin" >> $GITHUB_PATH
    - name: Print toolchain version
      run: |
        clang -v
        llc --version
    - name: Boot the kernel and collect coverage
      run: ./ci/5_boot_kernel_and_collect_coverage.sh
    - name: Print the index of coverage report
      run: cat $MCDC_HOME/analysis/text-coverage-reports/index.txt