Add licensecheck lint to CI and add missing licenses (#1929)

For the most part, `addlicense` handles the file types that we care
about. It also doesn't handle some files that we (AFAICT) don't want
license headers in: `.md` and `.mlir` files, e.g. However, it doesn't
handle some files for which we may want license headers: `.bazel`, some
`.in` files, `.pdll`, `.td`, `.bazelignore`, `.bazelrc`, `.bazelversion`.
I think it's debatable whether we want license headers in `.gitignore`
and `.clang-format` files, and these are also not handled by `addlicense`.

For `.bazel`, `.pdll` and `.td`, I will see if I can contribute to
`addlicense` to handle those. For `.in` files (e.g.
`lit.site.cfg.py.in`), I think whether or not we want a license actually
depends on what the "true" type of the file is (e.g. `.py`). Supporting
that would likely require additional changes to `addlicense`. Actually,
I think it would be great if `addlicense` had some kind of extensibility
mechanism (google/addlicense#50).

Anyway, although imperfect I think on the whole this should help us
catch missing licenses in a lot of cases we care about.

Inspired by #1928

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -1,3 +1,16 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 name: 🐞 Bug Report
 description: Report an issue
 body:

.github/ISSUE_TEMPLATE/config.yml

@@ -1,3 +1,16 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 blank_issues_enabled: true
 contact_links:
   - name: 📄 Blank Issue

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -1,3 +1,16 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 name: ➕ Feature Request
 description: Ask for a new feature to be added
 body:

.github/workflows/lint.yml

@@ -80,3 +80,19 @@ jobs:
 
       - name: Run buildifier checks
         run: ./build_tools/github_actions/lint_buildifier.sh
+
+  license-check:
+    if: "github.event_name == 'pull_request'"
+    runs-on: ${{ github.repository == 'openxla/stablehlo' && 'ubuntu-22.04-64core' ||  'ubuntu-22.04'  }}
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - name: Checking out repository
+        uses: actions/checkout@v4
+
+      - name: Install addlicense
+        run: go install github.com/google/addlicense@latest
+
+      - name: Run license checks
+        run: addlicense -check -ignore '.git/**' -ignore 'build/**' -ignore 'llvm*/**' .

stablehlo/conversions/CMakeLists.txt

@@ -1,2 +1,15 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 add_subdirectory(linalg)
 add_subdirectory(tosa)

stablehlo/conversions/linalg/CMakeLists.txt

@@ -1,2 +1,15 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 add_subdirectory(tests)
 add_subdirectory(transforms)

stablehlo/conversions/linalg/transforms/CMakeLists.txt

@@ -1,3 +1,16 @@
+# Copyright 2024 The StableHLO Authors.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
 set(LLVM_TARGET_DEFINITIONS Passes.td)
 mlir_tablegen(Passes.h.inc -gen-pass-decls -name StablehloLinalgTransforms)
 add_public_tablegen_target(StablehloLinalgTransformsPassIncGen)