[Mlir-commits] [mlir] [MLIR][ODS] Parse prop-dict fields with custom parsers (PR #217590)

Mehdi Amini llvmlistbot at llvm.org
Thu Aug 20 03:52:12 PDT 2026


https://github.com/joker-eph created https://github.com/llvm/llvm-project/pull/217590

Teach generated operation parsers to accept a key-value spelling for prop-dict and dispatch known fields through their ODS parsers. Keep the DictionaryAttr spelling as a compatibility path and use attribute conversion when a property has no usable FieldParser.

See #155475

Assisted-by: Codex

>From 92800dd7a7728c30a88f99b3d33a664fa437404b Mon Sep 17 00:00:00 2001
From: Mehdi Amini <joker.eph at gmail.com>
Date: Wed, 19 Aug 2026 07:08:17 -0700
Subject: [PATCH] [MLIR][ODS] Parse prop-dict fields with custom parsers

Teach generated operation parsers to accept a key-value spelling for
prop-dict and dispatch known fields through their ODS parsers. Keep the
DictionaryAttr spelling as a compatibility path and use attribute conversion
when a property has no usable FieldParser.

Assisted-by: Codex
---
 mlir/docs/DefiningDialects/Operations.md     |  14 +-
 mlir/include/mlir/IR/DialectImplementation.h |  80 +++++-
 mlir/include/mlir/IR/OpDefinition.h          |  22 +-
 mlir/include/mlir/TableGen/Property.h        |   4 +
 mlir/lib/TableGen/Property.cpp               |  15 ++
 mlir/test/IR/properties-invalid.mlir         |  79 ++++++
 mlir/test/IR/properties.mlir                 |  95 ++++++-
 mlir/test/lib/Dialect/Test/TestOps.h         |  34 +++
 mlir/test/lib/Dialect/Test/TestOps.td        | 264 +++++++++++++++++++
 mlir/test/mlir-tblgen/enums-gen.td           |  15 ++
 mlir/tools/mlir-tblgen/EnumsGen.cpp          |   8 +-
 mlir/tools/mlir-tblgen/OpFormatGen.cpp       | 218 +++++++++++++++
 12 files changed, 835 insertions(+), 13 deletions(-)
 create mode 100644 mlir/test/IR/properties-invalid.mlir

diff --git a/mlir/docs/DefiningDialects/Operations.md b/mlir/docs/DefiningDialects/Operations.md
index 1ef96130d836d..419041a52b0da 100644
--- a/mlir/docs/DefiningDialects/Operations.md
+++ b/mlir/docs/DefiningDialects/Operations.md
@@ -760,9 +760,17 @@ The available directives are as follows:
 
 *   `prop-dict`
 
-    -   Represents the properties of the operation converted to a dictionary.
-    -   Any property or inherent attribute that are not used elsewhere in the
-        format are parsed and printed as part of this dictionary.
+    -   Represents the properties of the operation. The generated parser
+        accepts a `<key = value, ...>` list. Explicit property parsers and
+        inherent-attribute parsers must consume exactly one value and leave the
+        comma separating it from the next entry unconsumed. Properties relying
+        on the default parser use attribute conversion instead when no
+        `FieldParser` specialization is available or when the selected
+        specialization declares `isKeyValueCompositional = false`.
+    -   The legacy `<{key = attribute, ...}>` dictionary spelling is also
+        accepted when parsing and is used by the generated printer.
+    -   Any property or inherent attribute that is not used elsewhere in the
+        format is parsed and printed as part of this list.
     -   If present, the `attr-dict` will not contain any inherent attributes.
 
 *   `custom < UserDirective > ( Params )`
diff --git a/mlir/include/mlir/IR/DialectImplementation.h b/mlir/include/mlir/IR/DialectImplementation.h
index 0b4f91cd750b8..2652114b508e3 100644
--- a/mlir/include/mlir/IR/DialectImplementation.h
+++ b/mlir/include/mlir/IR/DialectImplementation.h
@@ -70,6 +70,15 @@ class DialectAsmParser : public AsmParser {
 /// Provide a template class that can be specialized by users to dispatch to
 /// parsers. Auto-generated parsers generate calls to `FieldParser<T>::parse`,
 /// where `T` is the parameter storage type, to parse custom types.
+///
+/// A parser is key-value compositional only if it consumes exactly one value
+/// and leaves the comma separating the next key unconsumed. For example, an
+/// undelimited array parser for `values = 1, 2, next = 9` cannot distinguish
+/// its element commas from the comma before `next` and may try to parse `next`
+/// as another element. Marking it non-compositional lets a keyed property list
+/// use a self-delimiting attribute such as `array<i64: 1, 2>` instead.
+/// Specializations with this behavior, or that may succeed without consuming a
+/// token, should define `isKeyValueCompositional` as false.
 template <typename T, typename = T>
 struct FieldParser;
 
@@ -131,6 +140,8 @@ struct FieldParser<
     std::optional<AttributeT>,
     std::enable_if_t<std::is_base_of<Attribute, AttributeT>::value,
                      std::optional<AttributeT>>> {
+  static constexpr bool isKeyValueCompositional = false;
+
   static FailureOr<std::optional<AttributeT>> parse(AsmParser &parser) {
     if constexpr (HasStaticDialectName<AttributeT>::value) {
       parser.getContext()->getOrLoadDialect(AttributeT::dialectName);
@@ -151,6 +162,8 @@ template <typename IntT>
 struct FieldParser<
     std::optional<IntT>,
     std::enable_if_t<std::is_integral<IntT>::value, std::optional<IntT>>> {
+  static constexpr bool isKeyValueCompositional = false;
+
   static FailureOr<std::optional<IntT>> parse(AsmParser &parser) {
     IntT value;
     OptionalParseResult result = parser.parseOptionalInteger(value);
@@ -167,14 +180,51 @@ namespace detail {
 template <typename T>
 using has_push_back_t = decltype(std::declval<T>().push_back(
     std::declval<typename T::value_type &&>()));
+
+template <typename StorageType, typename = void>
+struct HasFieldParser : std::false_type {};
+
+template <typename StorageType>
+struct HasFieldParser<StorageType,
+                      std::void_t<decltype(sizeof(FieldParser<StorageType>)),
+                                  decltype(FieldParser<StorageType>::parse(
+                                      std::declval<OpAsmParser &>()))>>
+    : std::true_type {};
+
+template <typename ContainerT, typename = void>
+struct HasFieldParserContainer : std::false_type {};
+
+template <typename ContainerT>
+struct HasFieldParserContainer<ContainerT,
+                               std::void_t<has_push_back_t<ContainerT>>>
+    : HasFieldParser<typename ContainerT::value_type> {};
+
+template <typename Parser, typename = void>
+struct IsKeyValueCompositional : std::true_type {};
+
+template <typename Parser>
+struct IsKeyValueCompositional<
+    Parser, std::void_t<decltype(Parser::isKeyValueCompositional)>>
+    : std::bool_constant<Parser::isKeyValueCompositional> {};
+
+/// Whether the selected FieldParser consumes exactly one value in a keyed
+/// property list. Parser specializations may set isKeyValueCompositional to
+/// false if they can succeed without consuming a token or consume an
+/// undelimited comma-separated list.
+template <typename StorageType>
+struct HasKeyValueFieldParser
+    : std::conjunction<HasFieldParser<StorageType>,
+                       IsKeyValueCompositional<FieldParser<StorageType>>> {};
 } // namespace detail
 
 /// Parse any container that supports back insertion as a list.
 template <typename ContainerT>
-struct FieldParser<ContainerT,
-                   std::enable_if_t<llvm::is_detected<detail::has_push_back_t,
-                                                      ContainerT>::value,
-                                    ContainerT>> {
+struct FieldParser<
+    ContainerT,
+    std::enable_if_t<detail::HasFieldParserContainer<ContainerT>::value,
+                     ContainerT>> {
+  static constexpr bool isKeyValueCompositional = false;
+
   using ElementT = typename ContainerT::value_type;
   static FailureOr<ContainerT> parse(AsmParser &parser) {
     ContainerT elements;
@@ -202,6 +252,28 @@ struct FieldParser<AffineMap> {
   }
 };
 
+namespace detail {
+/// Parse a property with its FieldParser when one is available, otherwise
+/// fall back to the property's attribute conversion.
+template <typename StorageType, typename ConvertFromAttribute>
+ParseResult
+parsePropertyWithFallback(OpAsmParser &parser, StorageType &storage,
+                          ConvertFromAttribute convertFromAttribute) {
+  if constexpr (HasKeyValueFieldParser<StorageType>::value) {
+    auto value = FieldParser<StorageType>::parse(parser);
+    if (failed(value))
+      return failure();
+    storage = std::move(*value);
+    return success();
+  } else {
+    Attribute attr;
+    if (parser.parseAttribute(attr))
+      return failure();
+    return convertFromAttribute(storage, attr);
+  }
+}
+} // namespace detail
+
 } // namespace mlir
 
 #endif // MLIR_IR_DIALECTIMPLEMENTATION_H
diff --git a/mlir/include/mlir/IR/OpDefinition.h b/mlir/include/mlir/IR/OpDefinition.h
index fe2fa0a0ccd23..075d39194ed97 100644
--- a/mlir/include/mlir/IR/OpDefinition.h
+++ b/mlir/include/mlir/IR/OpDefinition.h
@@ -1872,6 +1872,16 @@ class Op : public OpState, public Traits<ConcreteType>... {
   using detect_has_parse_properties =
       llvm::is_detected<has_parse_properties, T>;
 
+  /// Trait to check if T provides a generated parser for the key-value
+  /// spelling of `prop-dict`.
+  template <typename T, typename... Args>
+  using has_parse_properties_from_key_value_list =
+      decltype(T::parsePropertiesFromKeyValueList(
+          std::declval<OpAsmParser &>(), std::declval<OperationState &>()));
+  template <typename T>
+  using detect_has_parse_properties_from_key_value_list =
+      llvm::is_detected<has_parse_properties_from_key_value_list, T>;
+
   /// Trait to check if T provides a 'ConcreteEntity' type alias.
   template <typename T>
   using has_concrete_entity_t = typename T::ConcreteEntity;
@@ -2039,10 +2049,11 @@ class Op : public OpState, public Traits<ConcreteType>... {
         p, ConcreteType::getPropertiesAsAttr(ctx, properties), elidedProps);
   }
 
-  /// Parses 'prop-dict' for the operation. Unless overridden, the method will
-  /// parse the properties using the generic property dictionary using the
-  /// '<{ ... }>' syntax. The resulting properties are stored within the
-  /// property structure of 'result', accessible via 'getOrAddProperties'.
+  /// Parses 'prop-dict' for the operation. Generated parsers accept a keyed
+  /// list whose values use their custom assembly parsers, as well as the
+  /// legacy generic '<{ ... }>' dictionary syntax. The resulting properties
+  /// are stored within the property structure of 'result', accessible via
+  /// 'getOrAddProperties'.
   template <typename T = ConcreteType>
   static ParseResult parseProperties(OpAsmParser &parser,
                                      OperationState &result) {
@@ -2051,6 +2062,9 @@ class Op : public OpState, public Traits<ConcreteType>... {
           parser, result.getOrAddProperties<InferredProperties<T>>());
     }
 
+    if constexpr (detect_has_parse_properties_from_key_value_list<T>::value)
+      return T::parsePropertiesFromKeyValueList(parser, result);
+
     Attribute propertyDictionary;
     if (genericParseProperties(parser, propertyDictionary))
       return failure();
diff --git a/mlir/include/mlir/TableGen/Property.h b/mlir/include/mlir/TableGen/Property.h
index 81e6d85720829..5877b54147f99 100644
--- a/mlir/include/mlir/TableGen/Property.h
+++ b/mlir/include/mlir/TableGen/Property.h
@@ -94,6 +94,10 @@ class Property : public PropConstraint {
   // Returns the method call which parses this property from textual MLIR.
   StringRef getParserCall() const { return parserCall; }
 
+  // Returns true if this property uses the parser inherited from the base
+  // Property class.
+  bool usesDefaultParser() const;
+
   // Returns true if this property has defined an optional parser.
   bool hasOptionalParser() const { return !optionalParserCall.empty(); }
 
diff --git a/mlir/lib/TableGen/Property.cpp b/mlir/lib/TableGen/Property.cpp
index b003d74c7bdee..88a64891b8b86 100644
--- a/mlir/lib/TableGen/Property.cpp
+++ b/mlir/lib/TableGen/Property.cpp
@@ -104,6 +104,21 @@ Pred Property::getPredicate() const {
   return Pred(maybePred->getValue());
 }
 
+bool Property::usesDefaultParser() const {
+  const Record *propertyClass = def->getRecords().getClass("Property");
+  if (const auto *baseInit =
+          llvm::dyn_cast<DefInit>(def->getValueInit("baseProperty"))) {
+    Property baseProperty(baseInit);
+    if (getParserCall() == baseProperty.getParserCall())
+      return baseProperty.usesDefaultParser();
+  }
+  // RecordVal retains the source location of the initializer that supplied a
+  // field. An inherited parser therefore points at Property::parser, while an
+  // explicit `let parser` points at the override without inspecting its text.
+  return def->getValue("parser")->getLoc().getPointer() ==
+         propertyClass->getValue("parser")->getLoc().getPointer();
+}
+
 Property Property::getBaseProperty() const {
   if (const auto *defInit =
           llvm::dyn_cast<llvm::DefInit>(def->getValueInit("baseProperty"))) {
diff --git a/mlir/test/IR/properties-invalid.mlir b/mlir/test/IR/properties-invalid.mlir
new file mode 100644
index 0000000000000..a6adf7ed98f8a
--- /dev/null
+++ b/mlir/test/IR/properties-invalid.mlir
@@ -0,0 +1,79 @@
+// RUN: mlir-opt %s -split-input-file -verify-diagnostics
+
+// expected-error @below {{properties dictionary is missing required property: prop}}
+test.with_custom_prop_dict <attr = 1>
+
+// -----
+
+// expected-error @below {{properties dictionary is missing required attribute: attr}}
+test.with_custom_prop_dict <prop = 2>
+
+// -----
+
+// expected-error @below {{duplicate or unknown property in properties dictionary: prop}}
+test.with_custom_prop_dict <attr = 1, prop = 2, prop = 3>
+
+// -----
+
+// expected-error @below {{duplicate or unknown property in properties dictionary: unknown}}
+test.with_custom_prop_dict <attr = 1, prop = 2, unknown = 3>
+
+// -----
+
+// A required property dictionary cannot be omitted entirely.
+// expected-error @below {{properties dictionary is missing required property: prop}}
+test.with_custom_prop_dict
+
+// -----
+
+// expected-error @below {{expected integer value}}
+test.with_custom_prop_dict <attr = 1, prop = bad>
+
+// -----
+
+// expected-error @below {{invalid value for property prop}}
+test.with_wrapped_properties <prop = 1 : i64>
+
+// -----
+
+// A required keyed value may not succeed without consuming a token.
+// expected-error @below {{expected attribute value}}
+test.with_key_value_parser_boundaries <values = array<i64: 1>, maybe = >
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// A segment-size property inferred later in the parser must not be accepted
+// and then silently overwritten.
+// expected-error @below {{unknown property in properties dictionary: operandSegmentSizes}}
+test.variadic_segment_prop %c0 : %c0 : i64 : i64 <operandSegmentSizes = [1, 1]> end
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// expected-error @below {{unknown property in properties dictionary: resultSegmentSizes}}
+test.variadic_segment_prop %c0 : %c0 : i64 : i64 <resultSegmentSizes = [1, 1]> end
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// expected-error @below {{properties dictionary is missing required property: operandSegmentSizes}}
+test.variadic_segment_prop_bulk_type(%c0, %c0, %c0) : (i64, i64, i64) -> (i64, i64, i64) <resultSegmentSizes = [2, 1]>
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// expected-error @below {{properties dictionary is missing required property: resultSegmentSizes}}
+test.variadic_segment_prop_bulk_type(%c0, %c0, %c0) : (i64, i64, i64) -> (i64, i64, i64) <operandSegmentSizes = [2, 1]>
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// expected-error @below {{expected 2 entries for operandSegmentSizes}}
+test.variadic_segment_prop_bulk_type(%c0, %c0, %c0) : (i64, i64, i64) -> (i64, i64, i64) <operandSegmentSizes = [3], resultSegmentSizes = [2, 1]>
+
+// -----
+
+%c0 = arith.constant 0 : i64
+// expected-error @below {{expected 2 entries for resultSegmentSizes}}
+test.variadic_segment_prop_bulk_type(%c0, %c0, %c0) : (i64, i64, i64) -> (i64, i64, i64) <operandSegmentSizes = [2, 1], resultSegmentSizes = [3]>
diff --git a/mlir/test/IR/properties.mlir b/mlir/test/IR/properties.mlir
index 4d83038f31cdd..64548e41dc111 100644
--- a/mlir/test/IR/properties.mlir
+++ b/mlir/test/IR/properties.mlir
@@ -23,6 +23,85 @@ test.with_wrapped_properties <{prop = "content for properties"}>
 // GENERIC: "test.empty_properties"()
 test.empty_properties
 
+// An explicitly empty key-value list is also accepted.
+// CHECK: test.empty_properties
+// GENERIC: "test.empty_properties"()
+test.empty_properties <>
+
+// The key-value spelling uses the custom parsers for both attributes and
+// properties. Until the custom printer is enabled, it round-trips to the
+// generic DictionaryAttr spelling.
+// CHECK: test.with_custom_prop_dict <{attr = 1 : i32, prop = 2 : i64}>
+// GENERIC: "test.with_custom_prop_dict"()
+// GENERIC-SAME: <{attr = 1 : i32, defaulted = 42 : i64, prop = 2 : i64, unit = false}>
+test.with_custom_prop_dict <attr = 1, prop = 2>
+
+// The generic DictionaryAttr spelling remains accepted for compatibility.
+// CHECK: test.with_custom_prop_dict <{attr = 3 : i32, prop = 4 : i64}>
+// GENERIC: "test.with_custom_prop_dict"()
+// GENERIC-SAME: <{attr = 3 : i32, defaulted = 42 : i64, prop = 4 : i64, unit = false}>
+test.with_custom_prop_dict <{attr = 3 : i32, prop = 4 : i64}>
+
+// Entries are order-independent, and optional/default-valued entries use
+// their custom parsers when present.
+// CHECK: test.with_custom_prop_dict <{attr = 5 : i32, defaulted = 43 : i64, optional = "set", prop = 6 : i64}>
+// GENERIC: "test.with_custom_prop_dict"()
+// GENERIC-SAME: <{attr = 5 : i32, defaulted = 43 : i64, optional = "set", prop = 6 : i64, unit = false}>
+test.with_custom_prop_dict <optional = "set", defaulted = 43, prop = 6, attr = 5>
+
+// A field name that is also the start of an attribute must not be consumed by
+// the legacy DictionaryAttr compatibility probe.
+// CHECK: test.with_custom_prop_dict <{attr = 7 : i32, prop = 8 : i64, unit}>
+// GENERIC: "test.with_custom_prop_dict"()
+// GENERIC-SAME: <{attr = 7 : i32, defaulted = 42 : i64, prop = 8 : i64, unit}>
+test.with_custom_prop_dict <unit = unit, attr = 7, prop = 8>
+
+// Properties bound elsewhere in the assembly format are excluded from the
+// key-value list.
+// CHECK: test.with_properties_and_attr 7 <{rhs = 8 : i64}>
+// GENERIC: "test.with_properties_and_attr"()
+// GENERIC-SAME: <{lhs = 7 : i32, rhs = 8 : i64}>
+test.with_properties_and_attr 7 <rhs = 8>
+
+// A property without a usable custom parser falls back to its attribute
+// conversion for this compatibility spelling.
+// CHECK: test.with_wrapped_properties <{prop = "custom spelling"}>
+// GENERIC: "test.with_wrapped_properties"()
+// GENERIC-SAME: <{prop = "custom spelling"}>
+test.with_wrapped_properties <prop = "custom spelling">
+
+// Forwarding property wrappers preserve whether their base uses the default
+// FieldParser, so a wrapped custom storage type still uses attribute fallback.
+// CHECK: test.with_default_wrapped_properties
+// GENERIC: "test.with_default_wrapped_properties"()
+// GENERIC-SAME: <{prop = "wrapped default spelling"}>
+test.with_default_wrapped_properties <prop = "wrapped default spelling">
+
+// A container FieldParser is unavailable when its element parser is
+// unavailable, so the complete property also falls back to conversion.
+// CHECK: test.with_wrapped_array_properties
+// GENERIC: "test.with_wrapped_array_properties"()
+// GENERIC-SAME: <{prop = ["first", "second"]}>
+test.with_wrapped_array_properties <prop = ["first", "second"]>
+
+// Default optional and container FieldParsers do not delimit exactly one
+// property value, so they use attribute conversion in a key-value list. The
+// following scalar key also checks that the container does not consume the
+// outer comma.
+// CHECK: test.with_key_value_parser_boundaries
+// CHECK-SAME: <{maybe = [], maybeEnum = [], next = 9 : i64, specializedMaybe = [7 : i16], specializedValues = array<i32: 3, 4>, values = array<i64: 1, 2>}>
+// GENERIC: "test.with_key_value_parser_boundaries"()
+// GENERIC-SAME: <{maybe = [], maybeEnum = [], next = 9 : i64, specializedMaybe = [7 : i16], specializedValues = array<i32: 3, 4>, values = array<i64: 1, 2>}>
+test.with_key_value_parser_boundaries <specializedValues = [3, 4], specializedMaybe = some<7>, values = array<i64: 1, 2>, maybe = [], maybeEnum = [], next = 9>
+
+// A comma-separated bit-enum FieldParser is not compositional with the outer
+// list, so prop-dict uses its attribute conversion before parsing another key.
+// CHECK: test.op_with_bit_enum_prop_dict
+// CHECK-SAME: <{flags = 3 : i32, next = 9 : i64}>
+// GENERIC: "test.op_with_bit_enum_prop_dict"()
+// GENERIC-SAME: <{flags = 3 : i32, next = 9 : i64}>
+test.op_with_bit_enum_prop_dict <flags = 3 : i32, next = 9>
+
 // CHECK: test.using_property_in_custom
 // CHECK-SAME: [1, 4, 20]{{$}}
 // GENERIC: "test.using_property_in_custom"()
@@ -55,7 +134,7 @@ test.variadic_segment_prop %ci64, %ci64 : %ci64 : i64, i64 : i64 end
 // key 'operandSegmentSizes' in dictionary attribute".
 // CHECK: test.variadic_segment_prop_bulk_type(%[[CI64]], %[[CI64]], %[[CI64]]) : (i64, i64, i64) -> (i64, i64, i64) <{operandSegmentSizes = array<i32: 2, 1>, resultSegmentSizes = array<i32: 2, 1>}>
 // GENERIC: "test.variadic_segment_prop_bulk_type"(%[[CI64]], %[[CI64]], %[[CI64]]) <{operandSegmentSizes = array<i32: 2, 1>, resultSegmentSizes = array<i32: 2, 1>}> : (i64, i64, i64) -> (i64, i64, i64)
-test.variadic_segment_prop_bulk_type(%ci64, %ci64, %ci64) : (i64, i64, i64) -> (i64, i64, i64) <{operandSegmentSizes = array<i32: 2, 1>, resultSegmentSizes = array<i32: 2, 1>}>
+test.variadic_segment_prop_bulk_type(%ci64, %ci64, %ci64) : (i64, i64, i64) -> (i64, i64, i64) <operandSegmentSizes = [2, 1], resultSegmentSizes = [2, 1]>
 
 // CHECK:   test.with_default_valued_properties na{{$}}
 // GENERIC: "test.with_default_valued_properties"()
@@ -121,6 +200,20 @@ test.op_with_property_predicates <{
   non_empty_constrained = [1],
   unconstrained = 0 : i64}>
 
+// Keyed parsing composes optional and aggregate property parsers with a
+// following outer dictionary entry.
+// CHECK: test.op_with_property_predicates
+// CHECK-SAME: array = [3, 4]
+// CHECK-SAME: optional = [2]
+test.op_with_property_predicates <
+  scalar = 1,
+  optional = 2,
+  more_constrained = 1,
+  array = [3, 4],
+  non_empty_unconstrained = [1],
+  non_empty_constrained = [1],
+  unconstrained = 0>
+
 // Tests that DefaultValuedProp is printed when value differs from default.
 // CHECK: test.op_with_property_predicates
 // CHECK-SAME: defaulted = 3
diff --git a/mlir/test/lib/Dialect/Test/TestOps.h b/mlir/test/lib/Dialect/Test/TestOps.h
index b4cc2cd6cf569..6320d39138f5f 100644
--- a/mlir/test/lib/Dialect/Test/TestOps.h
+++ b/mlir/test/lib/Dialect/Test/TestOps.h
@@ -43,6 +43,40 @@
 #include "mlir/Interfaces/ViewLikeInterface.h"
 #include "llvm/ADT/SetVector.h"
 #include "llvm/ADT/SmallVector.h"
+#include <optional>
+
+namespace mlir {
+// Self-delimiting full specializations remain usable in a keyed prop-dict even
+// when their storage type is optional or container-like.
+template <>
+struct FieldParser<llvm::SmallVector<int32_t>> {
+  static FailureOr<llvm::SmallVector<int32_t>> parse(AsmParser &parser) {
+    llvm::SmallVector<int32_t> values;
+    if (parser.parseCommaSeparatedList(AsmParser::Delimiter::Square, [&]() {
+          int32_t value;
+          if (parser.parseInteger(value))
+            return failure();
+          values.push_back(value);
+          return success();
+        }))
+      return failure();
+    return values;
+  }
+};
+
+template <>
+struct FieldParser<std::optional<int16_t>> {
+  static FailureOr<std::optional<int16_t>> parse(AsmParser &parser) {
+    if (succeeded(parser.parseOptionalKeyword("none")))
+      return std::optional<int16_t>{};
+    int16_t value;
+    if (parser.parseKeyword("some") || parser.parseLess() ||
+        parser.parseInteger(value) || parser.parseGreater())
+      return failure();
+    return std::optional<int16_t>{value};
+  }
+};
+} // namespace mlir
 
 namespace test {
 class TestDialect;
diff --git a/mlir/test/lib/Dialect/Test/TestOps.td b/mlir/test/lib/Dialect/Test/TestOps.td
index 3cb7f6ce2a054..0bd7fe401c3c9 100644
--- a/mlir/test/lib/Dialect/Test/TestOps.td
+++ b/mlir/test/lib/Dialect/Test/TestOps.td
@@ -534,6 +534,12 @@ def OpWithTestBitEnum : TEST_Op<"op_with_bit_enum_prop"> {
   let assemblyFormat = "$value1 ($value2^)? attr-dict `:` `(``)`";
 }
 
+def OpWithTestBitEnumPropDict
+    : TEST_Op<"op_with_bit_enum_prop_dict"> {
+  let arguments = (ins TestBitEnumProp:$flags, I64Prop:$next);
+  let assemblyFormat = "prop-dict attr-dict";
+}
+
 def TestBitEnumPropNamed : NamedEnumProp<TestBitEnum, "bit_enum"> {
   let defaultValue = TestBitEnum.cppType # "::Read";
 }
@@ -3627,6 +3633,18 @@ def TestOpWithPropertiesAndAttr
   let arguments = (ins I32Attr:$lhs, IntProp<"int64_t">:$rhs);
 }
 
+def TestOpWithCustomPropDict : TEST_Op<"with_custom_prop_dict"> {
+  let assemblyFormat = "prop-dict attr-dict";
+
+  let arguments = (ins
+    I32Attr:$attr,
+    I64Prop:$prop,
+    DefaultValuedProp<I64Prop, "42">:$defaulted,
+    OptionalAttr<StrAttr>:$optional,
+    UnitProp:$unit
+  );
+}
+
 def TestOpWithPropertiesAndInferredType
   : TEST_Op<"with_properties_and_inferred_type", [
     DeclareOpInterfaceMethods<InferTypeOpInterface>
@@ -3642,6 +3660,9 @@ def MyStructProperty : Property<"MyPropStruct"> {
   let convertToAttribute = "return $_storage.asAttribute($_ctxt);";
   let convertFromAttribute = "return MyPropStruct::setFromAttr($_storage, $_attr, $_diag);";
   let hashProperty = "$_storage.hash();";
+  // An optional parser does not imply that the default required FieldParser is
+  // available. `prop-dict` must still use attribute conversion as its fallback.
+  let optionalParser = "return std::nullopt;";
 }
 
 def TestOpWithWrappedProperties : TEST_Op<"with_wrapped_properties"> {
@@ -3651,6 +3672,249 @@ def TestOpWithWrappedProperties : TEST_Op<"with_wrapped_properties"> {
   );
 }
 
+def TestOpWithDefaultWrappedProperties
+    : TEST_Op<"with_default_wrapped_properties"> {
+  let assemblyFormat = "prop-dict attr-dict";
+  let arguments = (ins
+    DefaultValuedProp<MyStructProperty, "MyPropStruct{}">:$prop
+  );
+}
+
+def MyStructArrayProperty
+    : Property<"::llvm::SmallVector<MyPropStruct>"> {
+  let hashProperty =
+      "::llvm::hash_combine_range($_storage.begin(), $_storage.end())";
+  let readFromMlirBytecode = [{
+    uint64_t size;
+    if (::mlir::failed($_reader.readVarInt(size)))
+      return ::mlir::failure();
+    $_storage.clear();
+    while (size--) {
+      MyPropStruct value;
+      if (::mlir::failed(readFromMlirBytecode($_reader, value)))
+        return ::mlir::failure();
+      $_storage.push_back(std::move(value));
+    }
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeVarInt($_storage.size());
+    for (MyPropStruct &value : $_storage)
+      writeToMlirBytecode($_writer, value);
+  }];
+  let convertToAttribute = [{
+    ::llvm::SmallVector<::mlir::Attribute> attrs;
+    for (const MyPropStruct &value : $_storage)
+      attrs.push_back(value.asAttribute($_ctxt));
+    return ::mlir::ArrayAttr::get($_ctxt, attrs);
+  }];
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::ArrayAttr>($_attr);
+    if (!array)
+      return ::mlir::failure();
+    $_storage.clear();
+    for (::mlir::Attribute attr : array) {
+      MyPropStruct value;
+      if (::mlir::failed(MyPropStruct::setFromAttr(value, attr, $_diag)))
+        return ::mlir::failure();
+      $_storage.push_back(std::move(value));
+    }
+    return ::mlir::success();
+  }];
+}
+
+def TestOpWithWrappedArrayProperties
+    : TEST_Op<"with_wrapped_array_properties"> {
+  let assemblyFormat = "prop-dict attr-dict";
+  let arguments = (ins MyStructArrayProperty:$prop);
+}
+
+// The default FieldParser specializations for optional integers and generic
+// containers do not consume exactly one value in an outer comma-separated
+// list. The generated prop-dict parser must use attribute conversion for
+// these storage types instead.
+def KeyValueListProperty : Property<"::llvm::SmallVector<int64_t>"> {
+  let convertToAttribute =
+      "return ::mlir::DenseI64ArrayAttr::get($_ctxt, $_storage);";
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::DenseI64ArrayAttr>($_attr);
+    if (!array)
+      return $_diag() << "expected a dense i64 array";
+    auto values = array.asArrayRef();
+    $_storage.assign(values.begin(), values.end());
+    return ::mlir::success();
+  }];
+  let hashProperty =
+      "::llvm::hash_combine_range($_storage.begin(), $_storage.end())";
+  let readFromMlirBytecode = readMlirBytecodeUsingConvertFromAttribute;
+  let writeToMlirBytecode = writeMlirBytecodeWithConvertToAttribute;
+}
+
+def KeyValueOptionalProperty : Property<"std::optional<int64_t>"> {
+  let convertToAttribute = [{
+    if (!$_storage)
+      return ::mlir::ArrayAttr::get($_ctxt, {});
+    auto value = ::mlir::IntegerAttr::get(
+        ::mlir::IntegerType::get($_ctxt, 64), *$_storage);
+    return ::mlir::ArrayAttr::get($_ctxt, {value});
+  }];
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::ArrayAttr>($_attr);
+    if (!array || array.size() > 1)
+      return $_diag() << "expected a zero- or one-element array";
+    if (array.empty()) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    auto value = ::llvm::dyn_cast<::mlir::IntegerAttr>(array[0]);
+    if (!value)
+      return $_diag() << "expected an integer element";
+    $_storage = value.getInt();
+    return ::mlir::success();
+  }];
+  let hashProperty = "::llvm::hash_value($_storage.value_or(0))";
+  let readFromMlirBytecode = [{
+    bool isPresent;
+    if (::mlir::failed($_reader.readBool(isPresent)))
+      return ::mlir::failure();
+    if (!isPresent) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    int64_t value;
+    if (::mlir::failed($_reader.readSignedVarInt(value)))
+      return ::mlir::failure();
+    $_storage = value;
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage.has_value());
+    if ($_storage)
+      $_writer.writeSignedVarInt(*$_storage);
+  }];
+}
+
+def KeyValueOptionalEnumProperty
+    : Property<"std::optional<test::TestEnum>"> {
+  let convertToAttribute = [{
+    if (!$_storage)
+      return ::mlir::ArrayAttr::get($_ctxt, {});
+    auto value = ::mlir::IntegerAttr::get(
+        ::mlir::IntegerType::get($_ctxt, 32),
+        static_cast<uint32_t>(*$_storage));
+    return ::mlir::ArrayAttr::get($_ctxt, {value});
+  }];
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::ArrayAttr>($_attr);
+    if (!array || array.size() > 1)
+      return $_diag() << "expected a zero- or one-element array";
+    if (array.empty()) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    auto value = ::llvm::dyn_cast<::mlir::IntegerAttr>(array[0]);
+    if (!value)
+      return $_diag() << "expected an integer element";
+    $_storage = static_cast<test::TestEnum>(value.getInt());
+    return ::mlir::success();
+  }];
+  let hashProperty = [{
+    ::llvm::hash_value(static_cast<uint32_t>(
+        $_storage.value_or(test::TestEnum::First)))
+  }];
+  let readFromMlirBytecode = [{
+    bool isPresent;
+    if (::mlir::failed($_reader.readBool(isPresent)))
+      return ::mlir::failure();
+    if (!isPresent) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    uint64_t value;
+    if (::mlir::failed($_reader.readVarInt(value)))
+      return ::mlir::failure();
+    $_storage = static_cast<test::TestEnum>(value);
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage.has_value());
+    if ($_storage)
+      $_writer.writeVarInt(static_cast<uint64_t>(*$_storage));
+  }];
+}
+
+def KeyValueSpecializedListProperty
+    : Property<"::llvm::SmallVector<int32_t>"> {
+  let convertToAttribute =
+      "return ::mlir::DenseI32ArrayAttr::get($_ctxt, $_storage);";
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::DenseI32ArrayAttr>($_attr);
+    if (!array)
+      return $_diag() << "expected a dense i32 array";
+    auto values = array.asArrayRef();
+    $_storage.assign(values.begin(), values.end());
+    return ::mlir::success();
+  }];
+  let hashProperty =
+      "::llvm::hash_combine_range($_storage.begin(), $_storage.end())";
+  let readFromMlirBytecode = readMlirBytecodeUsingConvertFromAttribute;
+  let writeToMlirBytecode = writeMlirBytecodeWithConvertToAttribute;
+}
+
+def KeyValueSpecializedOptionalProperty
+    : Property<"std::optional<int16_t>"> {
+  let convertToAttribute = [{
+    if (!$_storage)
+      return ::mlir::ArrayAttr::get($_ctxt, {});
+    auto value = ::mlir::IntegerAttr::get(
+        ::mlir::IntegerType::get($_ctxt, 16), *$_storage);
+    return ::mlir::ArrayAttr::get($_ctxt, {value});
+  }];
+  let convertFromAttribute = [{
+    auto array = ::llvm::dyn_cast<::mlir::ArrayAttr>($_attr);
+    if (!array || array.size() > 1)
+      return $_diag() << "expected a zero- or one-element array";
+    if (array.empty()) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    auto value = ::llvm::dyn_cast<::mlir::IntegerAttr>(array[0]);
+    if (!value)
+      return $_diag() << "expected an integer element";
+    $_storage = static_cast<int16_t>(value.getInt());
+    return ::mlir::success();
+  }];
+  let hashProperty = "::llvm::hash_value($_storage.value_or(0))";
+  let readFromMlirBytecode = [{
+    bool isPresent;
+    if (::mlir::failed($_reader.readBool(isPresent)))
+      return ::mlir::failure();
+    if (!isPresent) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    int64_t value;
+    if (::mlir::failed($_reader.readSignedVarInt(value)))
+      return ::mlir::failure();
+    $_storage = static_cast<int16_t>(value);
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage.has_value());
+    if ($_storage)
+      $_writer.writeSignedVarInt(*$_storage);
+  }];
+}
+
+def TestOpWithKeyValueParserBoundaries
+    : TEST_Op<"with_key_value_parser_boundaries"> {
+  let assemblyFormat = "prop-dict attr-dict";
+  let arguments = (ins
+    KeyValueListProperty:$values,
+    KeyValueOptionalProperty:$maybe,
+    KeyValueOptionalEnumProperty:$maybeEnum,
+    KeyValueSpecializedListProperty:$specializedValues,
+    KeyValueSpecializedOptionalProperty:$specializedMaybe,
+    I64Prop:$next
+  );
+}
+
 // Same as above, but without a custom `hashProperty` field, checking
 // that ADL is correctly working.
 def MyStructProperty2 : Property<"MyPropStruct"> {
diff --git a/mlir/test/mlir-tblgen/enums-gen.td b/mlir/test/mlir-tblgen/enums-gen.td
index cf66ad46ad24b..e64e50b2382cb 100644
--- a/mlir/test/mlir-tblgen/enums-gen.td
+++ b/mlir/test/mlir-tblgen/enums-gen.td
@@ -45,6 +45,9 @@ def MyBitEnum: I32BitEnumAttr<"MyBitEnum", "An example bit enum",
 // DECL:     return parser.emitError(loc, "expected one of [none, tagged, Bit1, Bit2, Bit3, BitGroup] for An example bit enum, got: ") << enumKeyword;
 // DECL:   }
 
+// DECL: struct FieldParser<std::optional<::MyBitEnum>, std::optional<::MyBitEnum>> {
+// DECL:   static constexpr bool isKeyValueCompositional = false;
+
 // DECL: inline ::llvm::raw_ostream &operator<<(::llvm::raw_ostream &p, ::MyBitEnum value) {
 // DECL:   auto valueStr = stringifyEnum(value);
 // DECL:   switch (value) {
@@ -58,6 +61,11 @@ def MyBitEnum: I32BitEnumAttr<"MyBitEnum", "An example bit enum",
 // DECL:     return p << '"' << valueStr << '"';
 // DECL:   return p << valueStr;
 
+// DECL: struct FieldParser<::MyCommaSeparatedBitEnum, ::MyCommaSeparatedBitEnum> {
+// DECL:   static constexpr bool isKeyValueCompositional = false;
+// DECL: struct FieldParser<std::optional<::MyCommaSeparatedBitEnum>, std::optional<::MyCommaSeparatedBitEnum>> {
+// DECL:   static constexpr bool isKeyValueCompositional = false;
+
 // DECL: enum class MyI8Enum : uint8_t {
 // DECL:   a = 254,
 // DECL:   b = 255,
@@ -129,6 +137,7 @@ def MyNonQuotedPrintBitEnum
     [None, Bit0, Bit1, Bit2, Bit3, BitGroup]>;
 
 // DECL: struct FieldParser<::MyNonQuotedPrintBitEnum, ::MyNonQuotedPrintBitEnum> {
+// DECL:   static constexpr bool isKeyValueCompositional = true;
 // DECL:   template <typename ParserT>
 // DECL:   static FailureOr<::MyNonQuotedPrintBitEnum> parse(ParserT &parser) {
 // DECL:     ::MyNonQuotedPrintBitEnum flags = {};
@@ -149,6 +158,12 @@ def MyNonQuotedPrintBitEnum
 // DECL:     return flags;
 // DECL:   }
 
+def MyCommaSeparatedBitEnum
+  : I32BitEnum<"MyCommaSeparatedBitEnum", "Comma-separated bit enum",
+    [None, Bit0, Bit1]> {
+  let separator = ", ";
+}
+
 // DECL: inline ::llvm::raw_ostream &operator<<(::llvm::raw_ostream &p, ::MyNonQuotedPrintBitEnum value) {
 // DECL:   auto valueStr = stringifyEnum(value);
 // DECL-NEXT:   return p << valueStr;
diff --git a/mlir/tools/mlir-tblgen/EnumsGen.cpp b/mlir/tools/mlir-tblgen/EnumsGen.cpp
index 4b90082176dc0..845f1ef46cf35 100644
--- a/mlir/tools/mlir-tblgen/EnumsGen.cpp
+++ b/mlir/tools/mlir-tblgen/EnumsGen.cpp
@@ -129,6 +129,8 @@ struct FieldParser<{0}, {0}> {{
 ///    let parameters = (ins OptionalParameter<"std::optional<TheEnumName>">:$value);
 template<>
 struct FieldParser<std::optional<{0}>, std::optional<{0}>> {{
+  static constexpr bool isKeyValueCompositional = false;
+
   template <typename ParserT>
   static FailureOr<std::optional<{0}>> parse(ParserT &parser) {{
     // Parse the keyword/string containing the enum.
@@ -157,6 +159,8 @@ inline ::llvm::raw_ostream &operator<<(::llvm::raw_ostream &p, {0} value) {{
 
   template<>
   struct FieldParser<{0}, {0}> {{
+    static constexpr bool isKeyValueCompositional = {7};
+
     template <typename ParserT>
     static FailureOr<{0}> parse(ParserT &parser) {{
       {0} flags = {{};
@@ -185,6 +189,8 @@ inline ::llvm::raw_ostream &operator<<(::llvm::raw_ostream &p, {0} value) {{
   ///    let parameters = (ins OptionalParameter<"std::optional<TheEnumName>">:$value);
   template<>
   struct FieldParser<std::optional<{0}>, std::optional<{0}>> {{
+    static constexpr bool isKeyValueCompositional = false;
+
     template <typename ParserT>
     static FailureOr<std::optional<{0}>> parse(ParserT &parser) {{
       {0} flags = {{};
@@ -233,7 +239,7 @@ inline ::llvm::raw_ostream &operator<<(::llvm::raw_ostream &p, {0} value) {{
             .Default("error, enum separator must be '|' or ','");
     os << formatv(parsedAndPrinterStartUnquotedBitEnum, qualName, cppNamespace,
                   enumInfo.getSummary(), casesList, separator, parseSeparatorFn,
-                  casesInitList);
+                  casesInitList, separator.trim() == "," ? "false" : "true");
   } else {
     os << formatv(parsedAndPrinterStart, qualName, cppNamespace,
                   enumInfo.getSummary(), casesList, casesInitList);
diff --git a/mlir/tools/mlir-tblgen/OpFormatGen.cpp b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
index 470d27cfc6060..815c51c91dddd 100644
--- a/mlir/tools/mlir-tblgen/OpFormatGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
@@ -1494,6 +1494,223 @@ return ::mlir::success();
 )decl";
 }
 
+/// Generate the parser for the key-value spelling of `prop-dict`. The generic
+/// DictionaryAttr spelling remains supported as a compatibility path.
+static void genKeyValuePropDictParser(OperationFormat &fmt, Operator &op,
+                                      OpClass &opClass) {
+  if (!fmt.hasPropDict || !fmt.useProperties)
+    return;
+
+  SmallVector<MethodParameter> paramList;
+  paramList.emplace_back("::mlir::OpAsmParser &", "parser");
+  paramList.emplace_back("::mlir::OperationState &", "result");
+
+  Method *method = opClass.addStaticMethod("::mlir::ParseResult",
+                                           "parsePropertiesFromKeyValueList",
+                                           std::move(paramList));
+  MethodBody &body = method->body().indent();
+
+  body << R"decl(
+auto &prop = result.getOrAddProperties<Properties>();
+(void)prop;
+)decl";
+
+  bool parseOperandSegmentSizes =
+      op.getTrait("::mlir::OpTrait::AttrSizedOperandSegments") &&
+      fmt.allOperands;
+  bool parseResultSegmentSizes =
+      op.getTrait("::mlir::OpTrait::AttrSizedResultSegments") &&
+      fmt.allResultTypes;
+
+  if (parseOperandSegmentSizes)
+    body << "bool seen_operandSegmentSizes = false;\n";
+  if (parseResultSegmentSizes)
+    body << "bool seen_resultSegmentSizes = false;\n";
+
+  auto shouldParseProperty = [&](const NamedProperty &property) {
+    return !fmt.usedProperties.contains(&property) &&
+           !fmt.inferredAttributes.contains(property.name);
+  };
+  auto shouldParseAttribute = [&](const NamedAttribute &attribute) {
+    return !attribute.attr.isDerivedAttr() &&
+           !fmt.usedAttributes.contains(&attribute) &&
+           !fmt.inferredAttributes.contains(attribute.name);
+  };
+
+  for (const NamedProperty &property : op.getProperties())
+    if (shouldParseProperty(property))
+      body << "bool seen_" << property.name << " = false;\n";
+  for (const NamedAttribute &attribute : op.getAttributes())
+    if (shouldParseAttribute(attribute))
+      body << "bool seen_" << attribute.name << " = false;\n";
+
+  body << R"decl(
+if (succeeded(parser.parseOptionalLess())) {
+  ::llvm::SMLoc dictionaryLoc = parser.getCurrentLocation();
+  ::mlir::NamedAttrList propertyAttributes;
+  if (parser.parseOptionalAttrDict(propertyAttributes))
+    return ::mlir::failure();
+  if (dictionaryLoc != parser.getCurrentLocation()) {
+    if (parser.parseGreater())
+      return ::mlir::failure();
+    auto propertyDictionary =
+        ::mlir::DictionaryAttr::get(parser.getContext(), propertyAttributes);
+    return setPropertiesFromParsedAttr(prop, propertyDictionary, [&]() {
+      return parser.emitError(dictionaryLoc)
+             << "invalid properties " << propertyDictionary << ": ";
+    });
+  }
+
+  bool reachedEnd = succeeded(parser.parseOptionalGreater());
+  while (!reachedEnd) {
+    ::llvm::SMLoc keyLoc = parser.getCurrentLocation();
+    ::llvm::StringRef key;
+    if (parser.parseKeyword(&key) || parser.parseEqual())
+      return ::mlir::failure();
+)decl";
+
+  bool isFirst = true;
+  FmtContext attrTypeCtx;
+  attrTypeCtx.withBuilder("parser.getBuilder()");
+
+  auto genSegmentSizesParser = [&](StringRef name) {
+    body << (isFirst ? "    if" : "    else if") << " (!seen_" << name
+         << " && key == \"" << name << "\") {\n"
+         << "      seen_" << name << " = true;\n"
+         << R"decl(
+      ::llvm::SmallVector<int32_t> parsedSegmentSizes;
+      if (parser.parseCommaSeparatedList(
+              ::mlir::AsmParser::Delimiter::Square, [&]() {
+                int32_t size;
+                if (parser.parseInteger(size))
+                  return ::mlir::failure();
+                parsedSegmentSizes.push_back(size);
+                return ::mlir::success();
+              }))
+        return ::mlir::failure();
+)decl"
+         << "      if (parsedSegmentSizes.size() != prop." << name
+         << ".size())\n"
+         << "        return parser.emitError(keyLoc, \"expected "
+         << (name == "operandSegmentSizes" ? op.getNumOperands()
+                                           : op.getNumResults())
+         << " entries for " << name << "\");\n"
+         << "      ::llvm::copy(parsedSegmentSizes, prop." << name
+         << ".begin());\n"
+         << "    }\n";
+    isFirst = false;
+  };
+
+  if (parseOperandSegmentSizes)
+    genSegmentSizesParser("operandSegmentSizes");
+  if (parseResultSegmentSizes)
+    genSegmentSizesParser("resultSegmentSizes");
+
+  for (const NamedProperty &property : op.getProperties()) {
+    if (!shouldParseProperty(property))
+      continue;
+    body << (isFirst ? "    if" : "    else if") << " (!seen_" << property.name
+         << " && key == \"" << property.name << "\") {\n"
+         << "      seen_" << property.name << " = true;\n";
+    if (!property.prop.usesDefaultParser()) {
+      PropertyVariable propertyVariable(&property);
+      genPropertyParser(&propertyVariable, body.indent(), fmt.opCppClassName);
+    } else {
+      FmtContext fctx;
+      fctx.addSubst("_attr", "propertyAttr");
+      fctx.addSubst("_storage", "propStorage");
+      fctx.addSubst("_diag", "emitError");
+      body.indent() << R"decl(
+auto parseResult = ::mlir::detail::parsePropertyWithFallback(
+    parser, prop.)decl"
+                    << property.name << R"decl(,
+    [&](auto &propStorage,
+        ::mlir::Attribute propertyAttr) -> ::mlir::LogicalResult {
+  auto emitError = [&]() {
+    return parser.emitError(parser.getCurrentLocation())
+           << "invalid value for property " << key << ": ";
+  };
+)decl";
+      body << tgfmt(property.prop.getConvertFromAttributeCall(), &fctx)
+           << ";\n";
+      body << "});\n"
+           << "if (failed(parseResult))\n"
+           << "  return ::mlir::failure();\n";
+      body.unindent();
+    }
+    body.unindent() << "    }\n";
+    isFirst = false;
+  }
+  for (const NamedAttribute &attribute : op.getAttributes()) {
+    if (!shouldParseAttribute(attribute))
+      continue;
+    body << (isFirst ? "    if" : "    else if") << " (!seen_" << attribute.name
+         << " && key == \"" << attribute.name << "\") {\n"
+         << "      seen_" << attribute.name << " = true;\n"
+         << "      " << attribute.attr.getStorageType() << " " << attribute.name
+         << "Attr;\n";
+    AttributeVariable attributeVariable(&attribute);
+    genAttrParser(&attributeVariable, body.indent(), attrTypeCtx,
+                  /*parseAsOptional=*/false, /*useProperties=*/true,
+                  fmt.opCppClassName);
+    body.unindent() << "    }\n";
+    isFirst = false;
+  }
+
+  if (isFirst) {
+    body << R"decl(
+    return parser.emitError(keyLoc,
+                            "unknown property in properties dictionary: ")
+           << key;
+)decl";
+  } else {
+    body << R"decl(
+    else {
+      return parser.emitError(
+                 keyLoc,
+                 "duplicate or unknown property in properties dictionary: ")
+             << key;
+    }
+)decl";
+  }
+
+  body << R"decl(
+    reachedEnd = succeeded(parser.parseOptionalGreater());
+    if (!reachedEnd && parser.parseComma())
+      return ::mlir::failure();
+  }
+}
+)decl";
+
+  if (parseOperandSegmentSizes)
+    body << "if (!seen_operandSegmentSizes)\n"
+            "  return ::mlir::emitError(result.location, \"properties "
+            "dictionary is missing required property: "
+            "operandSegmentSizes\");\n";
+  if (parseResultSegmentSizes)
+    body << "if (!seen_resultSegmentSizes)\n"
+            "  return ::mlir::emitError(result.location, \"properties "
+            "dictionary is missing required property: "
+            "resultSegmentSizes\");\n";
+
+  for (const NamedProperty &property : op.getProperties()) {
+    if (shouldParseProperty(property) && !property.prop.hasDefaultValue())
+      body << "if (!seen_" << property.name
+           << ")\n  return ::mlir::emitError(result.location, "
+              "\"properties dictionary is missing required property: "
+           << property.name << "\");\n";
+  }
+  for (const NamedAttribute &attribute : op.getAttributes()) {
+    if (shouldParseAttribute(attribute) && !attribute.attr.isOptional() &&
+        !attribute.attr.hasDefaultValue())
+      body << "if (!seen_" << attribute.name
+           << ")\n  return ::mlir::emitError(result.location, "
+              "\"properties dictionary is missing required attribute: "
+           << attribute.name << "\");\n";
+  }
+  body << "return ::mlir::success();\n";
+}
+
 void OperationFormat::genParser(Operator &op, OpClass &opClass) {
   SmallVector<MethodParameter> paramList;
   paramList.emplace_back("::mlir::OpAsmParser &", "parser");
@@ -1527,6 +1744,7 @@ void OperationFormat::genParser(Operator &op, OpClass &opClass) {
   body << "  return ::mlir::success();\n";
 
   genParsedAttrPropertiesSetter(*this, op, opClass);
+  genKeyValuePropDictParser(*this, op, opClass);
 }
 
 void OperationFormat::genElementParser(FormatElement *element, MethodBody &body,



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