diff --git a/flang/include/flang/Optimizer/Dialect/FIROps.td b/flang/include/flang/Optimizer/Dialect/FIROps.td
--- a/flang/include/flang/Optimizer/Dialect/FIROps.td
+++ b/flang/include/flang/Optimizer/Dialect/FIROps.td
@@ -1827,66 +1827,15 @@
   let arguments = (ins
     StrAttr:$field_id,
     TypeAttr:$on_type,
-    Variadic<AnyIntegerType>:$lenparams
+    Variadic<AnyIntegerType>:$typeparams
   );
 
-  let parser = [{
-    llvm::StringRef fieldName;
-    auto &builder = parser.getBuilder();
-    mlir::Type recty;
-    if (parser.parseOptionalKeyword(&fieldName) ||
-        parser.parseComma() ||
-        parser.parseType(recty))
-      return mlir::failure();
-    result.addAttribute(fieldAttrName(), builder.getStringAttr(fieldName));
-    if (!recty.dyn_cast<RecordType>())
-      return mlir::failure();
-    result.addAttribute(typeAttrName(), mlir::TypeAttr::get(recty));
-    if (!parser.parseOptionalLParen()) {
-      llvm::SmallVector<mlir::OpAsmParser::OperandType, 8> operands;
-      llvm::SmallVector<mlir::Type, 8> types;
-      auto loc = parser.getNameLoc();
-      if (parser.parseOperandList(operands,
-                                  mlir::OpAsmParser::Delimiter::None) ||
-          parser.parseColonTypeList(types) ||
-          parser.parseRParen() ||
-          parser.resolveOperands(operands, types, loc, result.operands))
-        return mlir::failure();
-    }
-    mlir::Type fieldType = fir::FieldType::get(builder.getContext());
-    if (parser.addTypeToList(fieldType, result.types))
-      return mlir::failure();
-    return mlir::success();
-  }];
+  let parser = "return parseFieldIndexOp(parser, result);";
 
-  let printer = [{
-    p << ' '
-      << (*this)->getAttrOfType<mlir::StringAttr>(fieldAttrName()).getValue()
-      << ", " << (*this)->getAttr(typeAttrName());
-    if (getNumOperands()) {
-      p << '(';
-      p.printOperands(lenparams());
-      auto sep = ") : ";
-      for (auto op : lenparams()) {
-        p << sep;
-        if (op)
-          p.printType(op.getType());
-        else
-          p << "()";
-        sep = ", ";
-      }
-    }
-  }];
+  let printer = "::print(p, *this);";
 
   let builders = [OpBuilder<(ins "llvm::StringRef":$fieldName,
-      "mlir::Type":$recTy, CArg<"mlir::ValueRange","{}">:$operands),
-    [{
-      $_state.addAttribute(fieldAttrName(),
-        $_builder.getStringAttr(fieldName));
-      $_state.addAttribute(typeAttrName(), TypeAttr::get(recTy));
-      $_state.addOperands(operands);
-    }]
-  >];
+      "mlir::Type":$recTy, CArg<"mlir::ValueRange","{}">:$operands)>];
 
   let extraClassDeclaration = [{
     static constexpr llvm::StringRef fieldAttrName() { return "field_id"; }
diff --git a/flang/lib/Optimizer/Dialect/FIROps.cpp b/flang/lib/Optimizer/Dialect/FIROps.cpp
--- a/flang/lib/Optimizer/Dialect/FIROps.cpp
+++ b/flang/lib/Optimizer/Dialect/FIROps.cpp
@@ -1225,6 +1225,69 @@
   build(builder, result, resTy, aggVal, aa);
 }
 
+//===----------------------------------------------------------------------===//
+// FieldIndexOp
+//===----------------------------------------------------------------------===//
+
+static mlir::ParseResult parseFieldIndexOp(mlir::OpAsmParser &parser,
+                                           mlir::OperationState &result) {
+  llvm::StringRef fieldName;
+  auto &builder = parser.getBuilder();
+  mlir::Type recty;
+  if (parser.parseOptionalKeyword(&fieldName) || parser.parseComma() ||
+      parser.parseType(recty))
+    return mlir::failure();
+  result.addAttribute(fir::FieldIndexOp::fieldAttrName(),
+                      builder.getStringAttr(fieldName));
+  if (!recty.dyn_cast<RecordType>())
+    return mlir::failure();
+  result.addAttribute(fir::FieldIndexOp::typeAttrName(),
+                      mlir::TypeAttr::get(recty));
+  if (!parser.parseOptionalLParen()) {
+    llvm::SmallVector<mlir::OpAsmParser::OperandType> operands;
+    llvm::SmallVector<mlir::Type> types;
+    auto loc = parser.getNameLoc();
+    if (parser.parseOperandList(operands, mlir::OpAsmParser::Delimiter::None) ||
+        parser.parseColonTypeList(types) || parser.parseRParen() ||
+        parser.resolveOperands(operands, types, loc, result.operands))
+      return mlir::failure();
+  }
+  mlir::Type fieldType = fir::FieldType::get(builder.getContext());
+  if (parser.addTypeToList(fieldType, result.types))
+    return mlir::failure();
+  return mlir::success();
+}
+
+static void print(mlir::OpAsmPrinter &p, fir::FieldIndexOp &op) {
+  p << ' '
+    << op.getOperation()
+           ->getAttrOfType<mlir::StringAttr>(fir::FieldIndexOp::fieldAttrName())
+           .getValue()
+    << ", " << op.getOperation()->getAttr(fir::FieldIndexOp::typeAttrName());
+  if (op.getNumOperands()) {
+    p << '(';
+    p.printOperands(op.typeparams());
+    const auto *sep = ") : ";
+    for (auto op : op.typeparams()) {
+      p << sep;
+      if (op)
+        p.printType(op.getType());
+      else
+        p << "()";
+      sep = ", ";
+    }
+  }
+}
+
+void fir::FieldIndexOp::build(mlir::OpBuilder &builder,
+                              mlir::OperationState &result,
+                              llvm::StringRef fieldName, mlir::Type recTy,
+                              mlir::ValueRange operands) {
+  result.addAttribute(fieldAttrName(), builder.getStringAttr(fieldName));
+  result.addAttribute(typeAttrName(), TypeAttr::get(recTy));
+  result.addOperands(operands);
+}
+
 //===----------------------------------------------------------------------===//
 // InsertOnRangeOp
 //===----------------------------------------------------------------------===//