[mlir][index] Add CAPI (#127039)

Author: maerhart

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

@@ -0,0 +1,24 @@
+//===-- mlir-c/Dialect/Index.h - C API for Index 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_INDEX_H
+#define MLIR_C_DIALECT_INDEX_H
+
+#include "mlir-c/IR.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+MLIR_DECLARE_CAPI_DIALECT_REGISTRATION(Index, index);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MLIR_C_DIALECT_INDEX_H

mlir/lib/CAPI/Dialect/CMakeLists.txt

@@ -81,6 +81,15 @@ add_mlir_upstream_c_api_library(MLIRCAPIGPU
   MLIRPass
 )
 
+add_mlir_upstream_c_api_library(MLIRCAPIIndex
+  Index.cpp
+
+  PARTIAL_SOURCES_INTENDED
+  LINK_LIBS PUBLIC
+  MLIRCAPIIR
+  MLIRIndexDialect
+)
+
 add_mlir_upstream_c_api_library(MLIRCAPIIRDL
   IRDL.cpp
 

mlir/lib/CAPI/Dialect/Index.cpp

@@ -0,0 +1,13 @@
+//===- Index.cpp - C Interface for Index 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/Index.h"
+#include "mlir/CAPI/Registration.h"
+#include "mlir/Dialect/Index/IR/IndexDialect.h"
+
+MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(Index, index, mlir::index::IndexDialect)