Include torch-mlir-opt in Python wheels (#3964)

This adds the `torch-mlir-opt` tool to the Python wheels, which allows
to use the commandline tool via a pip installed package instead of
having to compile the torch-mlir project yourself. The executable is
still installed to the deault location and copied over via the
`setup.py` to be included in the Python wheel. This could be refactored
and handled within CMake in a follow-up.

python/CMakeLists.txt

@@ -53,6 +53,7 @@ declare_mlir_python_sources(TorchMLIRPythonSources.Tools
   ADD_TO_PARENT TorchMLIRPythonSources
   SOURCES
     tools/import_onnx/__main__.py
+    tools/opt/__main__.py
 )
 
 declare_mlir_python_sources(TorchMLIRSiteInitialize
@@ -123,3 +124,5 @@ add_mlir_python_modules(TorchMLIRPythonModules
   COMMON_CAPI_LINK_LIBS
     TorchMLIRAggregateCAPI
 )
+
+add_dependencies(TorchMLIRPythonModules torch-mlir-opt)

python/torch_mlir/tools/opt/__main__.py

@@ -0,0 +1,40 @@
+# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+# See https://llvm.org/LICENSE.txt for license information.
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+# Also available under a BSD-style license. See LICENSE.
+
+"""Torch-MLIR modular optimizer driver
+
+Typically, when installed from a wheel, this can be invoked as:
+
+  torch-mlir-opt [options] <input file>
+
+To see available passes, dialects, and options, run:
+
+  torch-mlir-opt --help
+"""
+import os
+import platform
+import subprocess
+import sys
+
+from typing import Optional
+
+
+def _get_builtin_tool(exe_name: str) -> Optional[str]:
+    if platform.system() == "Windows":
+        exe_name = exe_name + ".exe"
+    this_path = os.path.dirname(__file__)
+    tool_path = os.path.join(this_path, "..", "..", "_mlir_libs", exe_name)
+    return tool_path
+
+
+def main(args=None):
+    if args is None:
+        args = sys.argv[1:]
+    exe = _get_builtin_tool("torch-mlir-opt")
+    return subprocess.call(args=[exe] + args)
+
+
+if __name__ == "__main__":
+    sys.exit(main())

setup.py

@@ -198,6 +198,12 @@ def run(self):
 
         shutil.copytree(python_package_dir, target_dir, symlinks=False)
 
+        torch_mlir_opt_src = os.path.join(cmake_build_dir, "bin", "torch-mlir-opt")
+        torch_mlir_opt_dst = os.path.join(
+            target_dir, "torch_mlir", "_mlir_libs", "torch-mlir-opt"
+        )
+        shutil.copy2(torch_mlir_opt_src, torch_mlir_opt_dst, follow_symlinks=False)
+
 
 class CMakeExtension(Extension):
     def __init__(self, name, sourcedir=""):
@@ -267,6 +273,7 @@ def build_extension(self, ext):
     entry_points={
         "console_scripts": [
             "torch-mlir-import-onnx = torch_mlir.tools.import_onnx:_cli_main",
+            "torch-mlir-opt = torch_mlir.tools.opt.__main__:main",
         ],
     },
     zip_safe=False,