[LLHD] Add type C API

Add a few functions to LLHD's C API to interact with the LLHD dialect
types.

include/circt-c/Dialect/LLHD.h

@@ -15,8 +15,35 @@
 extern "C" {
 #endif
 
+//===----------------------------------------------------------------------===//
+// Dialect
+//===----------------------------------------------------------------------===//
+
 MLIR_DECLARE_CAPI_DIALECT_REGISTRATION(LLHD, llhd);
 
+//===----------------------------------------------------------------------===//
+// Types
+//===----------------------------------------------------------------------===//
+
+/// Check if a type is a time type.
+MLIR_CAPI_EXPORTED bool llhdTypeIsATimeType(MlirType);
+/// Check if a type is a signal type.
+MLIR_CAPI_EXPORTED bool llhdTypeIsASignalType(MlirType);
+/// Check if a type is a pointer type.
+MLIR_CAPI_EXPORTED bool llhdTypeIsAPointerType(MlirType);
+
+/// Create a time type.
+MLIR_CAPI_EXPORTED MlirType llhdTimeTypeGet(MlirContext ctx);
+/// Create a signal type.
+MLIR_CAPI_EXPORTED MlirType llhdSignalTypeGet(MlirType element);
+/// Create a pointer type.
+MLIR_CAPI_EXPORTED MlirType llhdPointerTypeGet(MlirType element);
+
+/// Get the inner type of a signal.
+MLIR_CAPI_EXPORTED MlirType llhdSignalTypeGetElementType(MlirType);
+/// Get the inner type of a pointer.
+MLIR_CAPI_EXPORTED MlirType llhdPointerTypeGetElementType(MlirType);
+
 #ifdef __cplusplus
 }
 #endif

lib/CAPI/Dialect/LLHD.cpp

@@ -8,8 +8,58 @@
 
 #include "circt-c/Dialect/LLHD.h"
 #include "circt/Dialect/LLHD/IR/LLHDDialect.h"
+#include "circt/Dialect/LLHD/IR/LLHDTypes.h"
 #include "mlir/CAPI/IR.h"
 #include "mlir/CAPI/Registration.h"
 #include "mlir/CAPI/Support.h"
 
+using namespace circt;
+using namespace circt::llhd;
+
+//===----------------------------------------------------------------------===//
+// Dialect
+//===----------------------------------------------------------------------===//
+
 MLIR_DEFINE_CAPI_DIALECT_REGISTRATION(LLHD, llhd, circt::llhd::LLHDDialect)
+
+//===----------------------------------------------------------------------===//
+// Types
+//===----------------------------------------------------------------------===//
+
+/// Check if a type is a time type.
+bool llhdTypeIsATimeType(MlirType type) { return unwrap(type).isa<TimeType>(); }
+
+/// Check if a type is a signal type.
+bool llhdTypeIsASignalType(MlirType type) {
+  return unwrap(type).isa<SigType>();
+}
+
+/// Check if a type is a pointer type.
+bool llhdTypeIsAPointerType(MlirType type) {
+  return unwrap(type).isa<PtrType>();
+}
+
+/// Create a time type.
+MlirType llhdTimeTypeGet(MlirContext ctx) {
+  return wrap(TimeType::get(unwrap(ctx)));
+}
+
+/// Create a signal type.
+MlirType llhdSignalTypeGet(MlirType element) {
+  return wrap(SigType::get(unwrap(element)));
+}
+
+/// Create a pointer type.
+MlirType llhdPointerTypeGet(MlirType element) {
+  return wrap(PtrType::get(unwrap(element)));
+}
+
+/// Get the inner type of a signal.
+MlirType llhdSignalTypeGetElementType(MlirType type) {
+  return wrap(unwrap(type).cast<SigType>().getUnderlyingType());
+}
+
+/// Get the inner type of a pointer.
+MlirType llhdPointerTypeGetElementType(MlirType type) {
+  return wrap(unwrap(type).cast<PtrType>().getUnderlyingType());
+}