[mlir] Introduce C API for PDL dialect types

This change introduces C API helper functions to work with PDL types.
Modification closely follow the format of the https://reviews.llvm.org/D116546.

Reviewed By: ftynse

Differential Revision: https://reviews.llvm.org/D117221

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

@@ -0,0 +1,72 @@
+//===-- mlir-c/Dialect/PDL.h - C API for PDL 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_PDL_H
+#define MLIR_C_DIALECT_PDL_H
+
+#include "mlir-c/IR.h"
+#include "mlir-c/Registration.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+MLIR_DECLARE_CAPI_DIALECT_REGISTRATION(PDL, pdl);
+
+//===---------------------------------------------------------------------===//
+// PDLType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLType(MlirType type);
+
+//===---------------------------------------------------------------------===//
+// AttributeType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLAttributeType(MlirType type);
+
+MLIR_CAPI_EXPORTED MlirType mlirPDLAttributeTypeGet(MlirContext ctx);
+
+//===---------------------------------------------------------------------===//
+// OperationType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLOperationType(MlirType type);
+
+MLIR_CAPI_EXPORTED MlirType mlirPDLOperationTypeGet(MlirContext ctx);
+
+//===---------------------------------------------------------------------===//
+// RangeType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLRangeType(MlirType type);
+
+MLIR_CAPI_EXPORTED MlirType mlirPDLRangeTypeGet(MlirType elementType);
+
+//===---------------------------------------------------------------------===//
+// TypeType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLTypeType(MlirType type);
+
+MLIR_CAPI_EXPORTED MlirType mlirPDLTypeTypeGet(MlirContext ctx);
+
+//===---------------------------------------------------------------------===//
+// ValueType
+//===---------------------------------------------------------------------===//
+
+MLIR_CAPI_EXPORTED bool mlirTypeIsAPDLValueType(MlirType type);
+
+MLIR_CAPI_EXPORTED MlirType mlirPDLValueTypeGet(MlirContext ctx);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // MLIR_C_DIALECT_QUANT_H

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

@@ -1,4 +1,4 @@
-//===-- mlir-c/Dialect/LLVM.h - C API for LLVM --------------------*- C -*-===//
+//===-- mlir-c/Dialect/Quant.h - C API for LLVM -------------------*- C -*-===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM
 // Exceptions.

mlir/lib/CAPI/Dialect/CMakeLists.txt

@@ -106,3 +106,12 @@ add_mlir_upstream_c_api_library(MLIRCAPIQuant
   MLIRCAPIIR
   MLIRQuant
 )
+
+add_mlir_upstream_c_api_library(MLIRCAPIPDL
+  PDL.cpp
+
+  PARTIAL_SOURCES_INTENDED
+  LINK_LIBS PUBLIC
+  MLIRCAPIIR
+  MLIRPDL
+)

mlir/lib/CAPI/Dialect/PDL.cpp

@@ -0,0 +1,85 @@
+//===- PDL.cpp - C Interface for PDL 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/PDL.h"
+#include "mlir/CAPI/Registration.h"
+#include "mlir/Dialect/PDL/IR/PDL.h"
+#include "mlir/Dialect/PDL/IR/PDLOps.h"
+#include "mlir/Dialect/PDL/IR/PDLTypes.h"
+
+using namespace mlir;
+
+MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(PDL, pdl, pdl::PDLDialect)
+
+//===---------------------------------------------------------------------===//
+// PDLType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLType(MlirType type) {
+  return unwrap(type).isa<pdl::PDLType>();
+}
+
+//===---------------------------------------------------------------------===//
+// AttributeType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLAttributeType(MlirType type) {
+  return unwrap(type).isa<pdl::AttributeType>();
+}
+
+MlirType mlirPDLAttributeTypeGet(MlirContext ctx) {
+  return wrap(pdl::AttributeType::get(unwrap(ctx)));
+}
+
+//===---------------------------------------------------------------------===//
+// OperationType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLOperationType(MlirType type) {
+  return unwrap(type).isa<pdl::OperationType>();
+}
+
+MlirType mlirPDLOperationTypeGet(MlirContext ctx) {
+  return wrap(pdl::OperationType::get(unwrap(ctx)));
+}
+
+//===---------------------------------------------------------------------===//
+// RangeType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLRangeType(MlirType type) {
+  return unwrap(type).isa<pdl::RangeType>();
+}
+
+MlirType mlirPDLRangeTypeGet(MlirType elementType) {
+  return wrap(pdl::RangeType::get(unwrap(elementType)));
+}
+
+//===---------------------------------------------------------------------===//
+// TypeType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLTypeType(MlirType type) {
+  return unwrap(type).isa<pdl::TypeType>();
+}
+
+MlirType mlirPDLTypeTypeGet(MlirContext ctx) {
+  return wrap(pdl::TypeType::get(unwrap(ctx)));
+}
+
+//===---------------------------------------------------------------------===//
+// ValueType
+//===---------------------------------------------------------------------===//
+
+bool mlirTypeIsAPDLValueType(MlirType type) {
+  return unwrap(type).isa<pdl::ValueType>();
+}
+
+MlirType mlirPDLValueTypeGet(MlirContext ctx) {
+  return wrap(pdl::ValueType::get(unwrap(ctx)));
+}

mlir/lib/CAPI/Dialect/Quant.cpp

@@ -1,4 +1,4 @@
-//===- LLVM.cpp - C Interface for Quant dialect ---------------------------===//
+//===- Quant.cpp - C Interface for Quant dialect --------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.

mlir/test/CAPI/CMakeLists.txt

@@ -66,3 +66,11 @@ _add_capi_test_executable(mlir-capi-quant-test
     MLIRCAPIRegistration
     MLIRCAPIQuant
 )
+
+_add_capi_test_executable(mlir-capi-pdl-test
+  pdl.c
+  LINK_LIBS PRIVATE
+    MLIRCAPIIR
+    MLIRCAPIRegistration
+    MLIRCAPIPDL
+)

mlir/test/CAPI/pdl.c

@@ -0,0 +1,332 @@
+//===- pdl.c - Test of PDL dialect C API ----------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// RUN: mlir-capi-pdl-test 2>&1 | FileCheck %s
+
+#include "mlir-c/Dialect/PDL.h"
+#include "mlir-c/BuiltinTypes.h"
+#include "mlir-c/IR.h"
+
+#include <assert.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+// CHECK-LABEL: testAttributeType
+void testAttributeType(MlirContext ctx) {
+  fprintf(stderr, "testAttributeType\n");
+
+  MlirType parsedType = mlirTypeParseGet(
+      ctx, mlirStringRefCreateFromCString("!pdl.attribute"));
+  MlirType constructedType = mlirPDLAttributeTypeGet(ctx);
+
+  assert(!mlirTypeIsNull(parsedType) && "couldn't parse PDLAttributeType");
+  assert(!mlirTypeIsNull(constructedType) && "couldn't construct PDLAttributeType");
+
+  // CHECK: parsedType isa PDLType: 1
+  fprintf(stderr, "parsedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(parsedType));
+  // CHECK: parsedType isa PDLAttributeType: 1
+  fprintf(stderr, "parsedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(parsedType));
+  // CHECK: parsedType isa PDLOperationType: 0
+  fprintf(stderr, "parsedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(parsedType));
+  // CHECK: parsedType isa PDLRangeType: 0
+  fprintf(stderr, "parsedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(parsedType));
+  // CHECK: parsedType isa PDLTypeType: 0
+  fprintf(stderr, "parsedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(parsedType));
+  // CHECK: parsedType isa PDLValueType: 0
+  fprintf(stderr, "parsedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(parsedType));
+
+  // CHECK: constructedType isa PDLType: 1
+  fprintf(stderr, "constructedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(constructedType));
+  // CHECK: constructedType isa PDLAttributeType: 1
+  fprintf(stderr, "constructedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(constructedType));
+  // CHECK: constructedType isa PDLOperationType: 0
+  fprintf(stderr, "constructedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(constructedType));
+  // CHECK: constructedType isa PDLRangeType: 0
+  fprintf(stderr, "constructedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(constructedType));
+  // CHECK: constructedType isa PDLTypeType: 0
+  fprintf(stderr, "constructedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(constructedType));
+  // CHECK: constructedType isa PDLValueType: 0
+  fprintf(stderr, "constructedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(constructedType));
+
+  // CHECK: equal: 1
+  fprintf(stderr, "equal: %d\n", mlirTypeEqual(parsedType, constructedType));
+
+  // CHECK: !pdl.attribute
+  mlirTypeDump(parsedType);
+  // CHECK: !pdl.attribute
+  mlirTypeDump(constructedType);
+
+  fprintf(stderr, "\n\n");
+}
+
+// CHECK-LABEL: testOperationType
+void testOperationType(MlirContext ctx) {
+  fprintf(stderr, "testOperationType\n");
+
+  MlirType parsedType = mlirTypeParseGet(
+      ctx, mlirStringRefCreateFromCString("!pdl.operation"));
+  MlirType constructedType = mlirPDLOperationTypeGet(ctx);
+
+  assert(!mlirTypeIsNull(parsedType) && "couldn't parse PDLAttributeType");
+  assert(!mlirTypeIsNull(constructedType) && "couldn't construct PDLAttributeType");
+
+  // CHECK: parsedType isa PDLType: 1
+  fprintf(stderr, "parsedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(parsedType));
+  // CHECK: parsedType isa PDLAttributeType: 0
+  fprintf(stderr, "parsedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(parsedType));
+  // CHECK: parsedType isa PDLOperationType: 1 
+  fprintf(stderr, "parsedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(parsedType));
+  // CHECK: parsedType isa PDLRangeType: 0
+  fprintf(stderr, "parsedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(parsedType));
+  // CHECK: parsedType isa PDLTypeType: 0
+  fprintf(stderr, "parsedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(parsedType));
+  // CHECK: parsedType isa PDLValueType: 0
+  fprintf(stderr, "parsedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(parsedType));
+
+  // CHECK: constructedType isa PDLType: 1
+  fprintf(stderr, "constructedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(constructedType));
+  // CHECK: constructedType isa PDLAttributeType: 0
+  fprintf(stderr, "constructedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(constructedType));
+  // CHECK: constructedType isa PDLOperationType: 1
+  fprintf(stderr, "constructedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(constructedType));
+  // CHECK: constructedType isa PDLRangeType: 0
+  fprintf(stderr, "constructedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(constructedType));
+  // CHECK: constructedType isa PDLTypeType: 0
+  fprintf(stderr, "constructedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(constructedType));
+  // CHECK: constructedType isa PDLValueType: 0
+  fprintf(stderr, "constructedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(constructedType));
+
+  // CHECK: equal: 1
+  fprintf(stderr, "equal: %d\n", mlirTypeEqual(parsedType, constructedType));
+
+  // CHECK: !pdl.operation
+  mlirTypeDump(parsedType);
+  // CHECK: !pdl.operation
+  mlirTypeDump(constructedType);
+
+  fprintf(stderr, "\n\n");
+}
+
+// CHECK-LABEL: testRangeType
+void testRangeType(MlirContext ctx) {
+  fprintf(stderr, "testRangeType\n");
+
+  MlirType typeType = mlirPDLTypeTypeGet(ctx);
+  MlirType parsedType = mlirTypeParseGet(
+      ctx, mlirStringRefCreateFromCString("!pdl.range<type>"));
+  MlirType constructedType = mlirPDLRangeTypeGet(typeType);
+
+  assert(!mlirTypeIsNull(typeType) && "couldn't get PDLTypeType");
+  assert(!mlirTypeIsNull(parsedType) && "couldn't parse PDLAttributeType");
+  assert(!mlirTypeIsNull(constructedType) && "couldn't construct PDLAttributeType");
+
+  // CHECK: parsedType isa PDLType: 1
+  fprintf(stderr, "parsedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(parsedType));
+  // CHECK: parsedType isa PDLAttributeType: 0
+  fprintf(stderr, "parsedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(parsedType));
+  // CHECK: parsedType isa PDLOperationType: 0
+  fprintf(stderr, "parsedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(parsedType));
+  // CHECK: parsedType isa PDLRangeType: 1 
+  fprintf(stderr, "parsedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(parsedType));
+  // CHECK: parsedType isa PDLTypeType: 0
+  fprintf(stderr, "parsedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(parsedType));
+  // CHECK: parsedType isa PDLValueType: 0
+  fprintf(stderr, "parsedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(parsedType));
+
+  // CHECK: constructedType isa PDLType: 1
+  fprintf(stderr, "constructedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(constructedType));
+  // CHECK: constructedType isa PDLAttributeType: 0
+  fprintf(stderr, "constructedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(constructedType));
+  // CHECK: constructedType isa PDLOperationType: 0
+  fprintf(stderr, "constructedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(constructedType));
+  // CHECK: constructedType isa PDLRangeType: 1 
+  fprintf(stderr, "constructedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(constructedType));
+  // CHECK: constructedType isa PDLTypeType: 0
+  fprintf(stderr, "constructedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(constructedType));
+  // CHECK: constructedType isa PDLValueType: 0
+  fprintf(stderr, "constructedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(constructedType));
+
+  // CHECK: equal: 1
+  fprintf(stderr, "equal: %d\n", mlirTypeEqual(parsedType, constructedType));
+
+  // CHECK: !pdl.range<type>
+  mlirTypeDump(parsedType);
+  // CHECK: !pdl.range<type>
+  mlirTypeDump(constructedType);
+
+  fprintf(stderr, "\n\n");
+}
+
+// CHECK-LABEL: testTypeType
+void testTypeType(MlirContext ctx) {
+  fprintf(stderr, "testTypeType\n");
+
+  MlirType parsedType = mlirTypeParseGet(
+      ctx, mlirStringRefCreateFromCString("!pdl.type"));
+  MlirType constructedType = mlirPDLTypeTypeGet(ctx);
+
+  assert(!mlirTypeIsNull(parsedType) && "couldn't parse PDLAttributeType");
+  assert(!mlirTypeIsNull(constructedType) && "couldn't construct PDLAttributeType");
+
+  // CHECK: parsedType isa PDLType: 1
+  fprintf(stderr, "parsedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(parsedType));
+  // CHECK: parsedType isa PDLAttributeType: 0
+  fprintf(stderr, "parsedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(parsedType));
+  // CHECK: parsedType isa PDLOperationType: 0
+  fprintf(stderr, "parsedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(parsedType));
+  // CHECK: parsedType isa PDLRangeType: 0
+  fprintf(stderr, "parsedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(parsedType));
+  // CHECK: parsedType isa PDLTypeType: 1 
+  fprintf(stderr, "parsedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(parsedType));
+  // CHECK: parsedType isa PDLValueType: 0
+  fprintf(stderr, "parsedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(parsedType));
+
+  // CHECK: constructedType isa PDLType: 1
+  fprintf(stderr, "constructedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(constructedType));
+  // CHECK: constructedType isa PDLAttributeType: 0
+  fprintf(stderr, "constructedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(constructedType));
+  // CHECK: constructedType isa PDLOperationType: 0
+  fprintf(stderr, "constructedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(constructedType));
+  // CHECK: constructedType isa PDLRangeType: 0
+  fprintf(stderr, "constructedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(constructedType));
+  // CHECK: constructedType isa PDLTypeType: 1
+  fprintf(stderr, "constructedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(constructedType));
+  // CHECK: constructedType isa PDLValueType: 0
+  fprintf(stderr, "constructedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(constructedType));
+
+  // CHECK: equal: 1
+  fprintf(stderr, "equal: %d\n", mlirTypeEqual(parsedType, constructedType));
+
+  // CHECK: !pdl.type
+  mlirTypeDump(parsedType);
+  // CHECK: !pdl.type
+  mlirTypeDump(constructedType);
+
+  fprintf(stderr, "\n\n");
+}
+
+// CHECK-LABEL: testValueType
+void testValueType(MlirContext ctx) {
+  fprintf(stderr, "testValueType\n");
+
+  MlirType parsedType = mlirTypeParseGet(
+      ctx, mlirStringRefCreateFromCString("!pdl.value"));
+  MlirType constructedType = mlirPDLValueTypeGet(ctx);
+
+  assert(!mlirTypeIsNull(parsedType) && "couldn't parse PDLAttributeType");
+  assert(!mlirTypeIsNull(constructedType) && "couldn't construct PDLAttributeType");
+
+  // CHECK: parsedType isa PDLType: 1
+  fprintf(stderr, "parsedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(parsedType));
+  // CHECK: parsedType isa PDLAttributeType: 0
+  fprintf(stderr, "parsedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(parsedType));
+  // CHECK: parsedType isa PDLOperationType: 0
+  fprintf(stderr, "parsedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(parsedType));
+  // CHECK: parsedType isa PDLRangeType: 0
+  fprintf(stderr, "parsedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(parsedType));
+  // CHECK: parsedType isa PDLTypeType: 0
+  fprintf(stderr, "parsedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(parsedType));
+  // CHECK: parsedType isa PDLValueType: 1
+  fprintf(stderr, "parsedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(parsedType));
+
+  // CHECK: constructedType isa PDLType: 1
+  fprintf(stderr, "constructedType isa PDLType: %d\n", 
+      mlirTypeIsAPDLType(constructedType));
+  // CHECK: constructedType isa PDLAttributeType: 0
+  fprintf(stderr, "constructedType isa PDLAttributeType: %d\n", 
+      mlirTypeIsAPDLAttributeType(constructedType));
+  // CHECK: constructedType isa PDLOperationType: 0
+  fprintf(stderr, "constructedType isa PDLOperationType: %d\n", 
+      mlirTypeIsAPDLOperationType(constructedType));
+  // CHECK: constructedType isa PDLRangeType: 0
+  fprintf(stderr, "constructedType isa PDLRangeType: %d\n", 
+      mlirTypeIsAPDLRangeType(constructedType));
+  // CHECK: constructedType isa PDLTypeType: 0
+  fprintf(stderr, "constructedType isa PDLTypeType: %d\n", 
+      mlirTypeIsAPDLTypeType(constructedType));
+  // CHECK: constructedType isa PDLValueType: 1
+  fprintf(stderr, "constructedType isa PDLValueType: %d\n", 
+      mlirTypeIsAPDLValueType(constructedType));
+
+  // CHECK: equal: 1
+  fprintf(stderr, "equal: %d\n", mlirTypeEqual(parsedType, constructedType));
+
+  // CHECK: !pdl.value
+  mlirTypeDump(parsedType);
+  // CHECK: !pdl.value
+  mlirTypeDump(constructedType);
+
+  fprintf(stderr, "\n\n");
+}
+
+int main() {
+  MlirContext ctx = mlirContextCreate();
+  mlirDialectHandleRegisterDialect(mlirGetDialectHandle__pdl__(), ctx);
+  testAttributeType(ctx);
+  testOperationType(ctx);
+  testRangeType(ctx);
+  testTypeType(ctx);
+  testValueType(ctx);
+  return EXIT_SUCCESS;
+}

mlir/test/CMakeLists.txt

@@ -75,6 +75,7 @@ set(MLIR_TEST_DEPENDS
   mlir-capi-pass-test
   mlir-capi-sparse-tensor-test
   mlir-capi-quant-test
+  mlir-capi-pdl-test
   mlir-cpu-runner
   mlir-linalg-ods-yaml-gen
   mlir-lsp-server

mlir/test/lit.cfg.py

@@ -68,6 +68,7 @@ tools = [
     'mlir-capi-pass-test',
     'mlir-capi-sparse-tensor-test',
     'mlir-capi-quant-test',
+    'mlir-capi-pdl-test',
     'mlir-cpu-runner',
     'mlir-linalg-ods-yaml-gen',
     'mlir-reduce',

utils/bazel/llvm-project-overlay/mlir/BUILD.bazel

@@ -514,6 +514,26 @@ mlir_c_api_cc_library(
     ],
 )
 
+mlir_c_api_cc_library(
+    name = "CAPIPDL",
+    srcs = [
+        "lib/CAPI/Dialect/PDL.cpp",
+    ],
+    hdrs = [
+        "include/mlir-c/Dialect/PDL.h",
+    ],
+    header_deps = [
+        ":CAPIIRHeaders",
+    ],
+    includes = ["include"],
+    deps = [
+        ":CAPIIR",
+        ":PDLDialect",
+        ":PDLOpsIncGen",
+        ":PDLTypesIncGen",
+    ],
+)
+
 mlir_c_api_cc_library(
     name = "CAPIConversion",
     srcs = ["lib/CAPI/Conversion/Passes.cpp"],