[llvm] [mlir:python] Port Python bindings of IRDL to bazel build. (PR #159721)

[Ingo Müller via llvm-commits]

https://github.com/ingomueller-net created https://github.com/llvm/llvm-project/pull/159721

This PR sets up build rules for the Python bindings of the IRDL dialect introduced by #158488. The absence of them does not break the bazel build but some downstream users rely on them.

>From e007d044d22068da37f79829287768a447523214 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ingo=20M=C3=BCller?= <ingomueller at google.com>
Date: Fri, 19 Sep 2025 08:26:39 +0000
Subject: [PATCH] [mlir:python] Port Python bindings of IRDL to bazel build.
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This PR sets up build rules for the Python bindings of the IRDL dialect
introduced by #158488. The absence of them does not break the bazel
build but some downstream users rely on them.

Signed-off-by: Ingo Müller <ingomueller at google.com>
---
 .../llvm-project-overlay/mlir/BUILD.bazel     | 14 ++++++++
 .../mlir/python/BUILD.bazel                   | 32 +++++++++++++++++++
 2 files changed, 46 insertions(+)

diff --git a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
index 4681a02ad50ba..089f284d3182a 100644
--- a/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/mlir/BUILD.bazel
@@ -1211,6 +1211,20 @@ cc_binary(
     ],
 )
 
+cc_binary(
+    name = "_mlirDialectsIRDL.so",
+    srcs = ["lib/Bindings/Python/DialectIRDL.cpp"],
+    copts = PYBIND11_COPTS,
+    features = PYBIND11_FEATURES,
+    linkshared = 1,
+    linkstatic = 0,
+    deps = [
+        ":CAPIIR",
+        ":MLIRBindingsPythonNanobindHeadersAndDeps",
+        "@nanobind",
+    ],
+)
+
 cc_binary(
     name = "_mlirDialectsLinalg.so",
     srcs = ["lib/Bindings/Python/DialectLinalg.cpp"],
diff --git a/utils/bazel/llvm-project-overlay/mlir/python/BUILD.bazel b/utils/bazel/llvm-project-overlay/mlir/python/BUILD.bazel
index 016794d30b349..a6e8c515f0874 100644
--- a/utils/bazel/llvm-project-overlay/mlir/python/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/mlir/python/BUILD.bazel
@@ -537,6 +537,38 @@ filegroup(
     ],
 )
 
+##---------------------------------------------------------------------------##
+# IRDL dialect.
+##---------------------------------------------------------------------------##
+
+gentbl_filegroup(
+    name = "IRDLOpsPyGen",
+    tbl_outs = {
+        "mlir/dialects/_irdl_enum_gen.py": [
+            "-gen-python-enum-bindings",
+            "-bind-dialect=irdl",
+        ],
+        "mlir/dialects/_irdl_ops_gen.py": [
+            "-gen-python-op-bindings",
+            "-bind-dialect=irdl",
+        ],
+    },
+    tblgen = "//mlir:mlir-tblgen",
+    td_file = "mlir/dialects/IRDLOps.td",
+    deps = [
+        "//mlir:IRDLTdFiles",
+        "//mlir:OpBaseTdFiles",
+    ],
+)
+
+filegroup(
+    name = "IRDLPyFiles",
+    srcs = [
+        "mlir/dialects/irdl.py",
+        ":IRDLOpsPyGen",
+    ],
+)
+
 ##---------------------------------------------------------------------------##
 # Math dialect.
 ##---------------------------------------------------------------------------##