[mlir][python bindings] turn on openmp

[makslevental]

Summary

Just as in https://reviews.llvm.org/D157820, dialect registration is independent of any vendor specific libs having been linked/built/etc.

[rkayaith]

mlir/include/mlir-c/Dialect/OpenMP.h

2–3

formatting seems off here

[makslevental]

fix header

mlir/include/mlir-c/Dialect/OpenMP.h

+//===-- mlir-c/Dialect/OpenMP.h - C API for OpenMP Dialect --------*- C -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef MLIR_C_DIALECT_OPENM_H
+#define MLIR_C_DIALECT_OPENM_H
+
+#include "mlir-c/IR.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+MLIR_DECLARE_CAPI_DIALECT_REGISTRATION(OpenMP, omp);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MLIR_C_DIALECT_OPENM_H

mlir/lib/CAPI/Dialect/CMakeLists.txt

add_mlir_upstream_c_api_library(MLIRCAPIQuant
   Quant.cpp
 
   PARTIAL_SOURCES_INTENDED
   LINK_LIBS PUBLIC
   MLIRCAPIIR
   MLIRQuantDialect
 )
 
+add_mlir_upstream_c_api_library(MLIRCAPIOpenMP
+  OpenMP.cpp
+
+  PARTIAL_SOURCES_INTENDED
+  LINK_LIBS PUBLIC
+  MLIRCAPIIR
+  MLIROpenMPDialect
+)
+
 add_mlir_upstream_c_api_library(MLIRCAPIPDL
   PDL.cpp
 
   PARTIAL_SOURCES_INTENDED
   LINK_LIBS PUBLIC
   MLIRCAPIIR
   MLIRPDLDialect
 )

mlir/lib/CAPI/Dialect/OpenMP.cpp

+//===- OPENMP.cpp - C Interface for OPENMP dialect
+//------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir-c/Dialect/OpenMP.h"
+#include "mlir/CAPI/Registration.h"
+#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
+
+using namespace mlir;
+
+MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(OpenMP, omp, omp::OpenMPDialect)

mlir/python/CMakeLists.txt

SOURCES
     dialects/pdl.py
     dialects/_pdl_ops_ext.py
     _mlir_libs/_mlir/dialects/pdl.pyi
   DIALECT_NAME pdl)
 
 declare_mlir_dialect_python_bindings(
   ADD_TO_PARENT MLIRPythonSources.Dialects
   ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/mlir"
+  TD_FILE dialects/OpenMPOps.td
+  SOURCES
+    dialects/openmp.py
+  DIALECT_NAME omp)
+
+declare_mlir_dialect_python_bindings(
+  ADD_TO_PARENT MLIRPythonSources.Dialects
+  ROOT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/mlir"
   TD_FILE dialects/SCFOps.td
   SOURCES
     dialects/scf.py
     dialects/_scf_ops_ext.py
   DIALECT_NAME scf)
 
 declare_mlir_dialect_python_bindings(
   ADD_TO_PARENT MLIRPythonSources.Dialects

mlir/python/mlir/dialects/OpenMPOps.td

+//===-- OpenMPOps.td - Entry point for OpenMPOps bind ------------*- tablegen -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef PYTHON_BINDINGS_OPENMP_OPS
+#define PYTHON_BINDINGS_OPENMP_OPS
+
+include "mlir/Dialect/OpenMP/OpenMPOps.td"
+
+#endif

mlir/python/mlir/dialects/openmp.py

+#  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
+
+from ._omp_ops_gen import *

mlir/test/python/dialects/openmp_ops.py

+# RUN: %PYTHON %s | FileCheck %s
+
+from mlir.ir import *
+from mlir.dialects.openmp import *
+
+
+def constructAndPrintInModule(f):
+    print("\nTEST:", f.__name__)
+    with Context(), Location.unknown():
+        module = Module.create()
+        with InsertionPoint(module.body):
+            f()
+        print(module)
+    return f
+
+
+# CHECK-LABEL: test_barrier
+# CHECK: module {
+# CHECK:   omp.barrier
+# CHECK: }
+@constructAndPrintInModule
+def test_barrier():
+    barrier = BarrierOp()