[Mlir-commits] [mlir] [mlir] Add property combinators, initial ODS support (PR #94732)

Krzysztof Drewniak llvmlistbot at llvm.org
Wed Jul 17 21:57:25 PDT 2024


https://github.com/krzysz00 updated https://github.com/llvm/llvm-project/pull/94732

>From 5d25c52d0311c40bcd0849b215eac2a8d10faaf8 Mon Sep 17 00:00:00 2001
From: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
Date: Tue, 28 May 2024 16:26:00 +0000
Subject: [PATCH 1/5] [mlir] Add property combinators, initial ODS support

While we have had a Properties.td that allowed for defining
non-attribute-backed properties, such properties were not plumbed
through the basic autogeneration facilities available to attributes,
forcing those who want to migrate to the new system to write such code
by hand.

  ## Potentially breaking changes

- The `setFoo()` methods on `Properties` struct no longer take their
inputs by const reference. Those wishing to pass non-owned values of a
property by reference to constructors and setters should set the
interface type to `const [storageType]&`
- Adapters and operations now define getters and setters for
properties listed in ODS, which may conflict with custom getters.
- Builders now include properties listed in ODS specifications,
potentially conflicting with custom builders with the same type
signature.

  ## Extensions to the `Property` class

This pull request adds several fields to the `Property` class,
including:
- `parser`, `optionalParser`, and `printer` (for parsing/printing
properties of a given type in ODS syntax)
- `storageTypeValueOverride`, an extension of `defaultValue` to allow
the storage and interface type defaults to differ
- `baseProperty` (allowing for classes like `DefaultValuedProperty`)

Existing fields have also had their documentation comments updated.

This commit does not add a `PropertyConstraint` analogous to
`AttrConstraint`, but this is a natural evolution of the work here.

This commit also adds the concrete property kinds `I32Property`,
`I64Property`, `UnitProperty` (and special handling for it like for
UnitAttr), and `BoolProperty`.

  ## Property combinators

`Properties.td` also now includes several ways to combine properties.

One is `ArrayProperty<Property elem>`, which now stores a variable-length
array of some property as `SmallVector<elem.storageType>` and uses
`ArrayRef<elem.storageType>` as its interface type. It has
`IntArrayProperty` subclasses that change its conversion to attributes
to use `DenseI[N]Attr`s instead of an `ArrayAttr`.

Similarly, `OptionalProperty<Property p>` wraps a property's storage
in `std::optional<>` and adds a `std::nullopt` default value. In the
case where the underlying property can be parsed optionally but
doesn't have its own default value, `OptionalProperty` can piggyback
off the optional parser to produce a cleaner syntax, as opposed to its
general form, which is either `none` or `some<[value]>`.

(Note that `OptionalProperty` can be nested if desired).

  ## Autogeneration changes

Operations and adaptors now support getters and setters for properties
like those for attributes. Unlike for attributes, there aren't
separate value and attribute forms, since there is no `FooAttr()`
available for a `getFooAttr()` to return.

The largest change is to operation formats. Previously, properties
could only be used in custom directives. Now, they can be used
anywhere an attribute could be used, and have parsers and printers
defined in their tablegen records.

These updates include special `UnitProperty` logic like that used for
`UnitAttr`.

  ## Misc.

Some attempt has been made to test the new functionality.

This commit takes tentative steps towards updating the documentation
to account for properties. A full update will be in order once any
followup work has been completed and the interfaces have stabilized.
---
 mlir/docs/DefiningDialects/Operations.md      |  53 +-
 mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td   |  15 +-
 mlir/include/mlir/IR/ODSSupport.h             |  48 +-
 mlir/include/mlir/IR/Properties.td            | 562 +++++++++++++++++-
 mlir/include/mlir/TableGen/Operator.h         |   2 +-
 mlir/include/mlir/TableGen/Property.h         |  53 +-
 mlir/lib/IR/ODSSupport.cpp                    |  71 +++
 mlir/lib/TableGen/Property.cpp                |  59 +-
 mlir/test/IR/properties.mlir                  |  52 +-
 mlir/test/IR/traits.mlir                      |  19 +
 mlir/test/Transforms/test-legalizer.mlir      |   4 +-
 .../test/lib/Dialect/Test/TestFormatUtils.cpp |  16 +-
 mlir/test/lib/Dialect/Test/TestFormatUtils.h  |   3 +-
 mlir/test/lib/Dialect/Test/TestOps.td         |  85 ++-
 mlir/test/lib/Dialect/Test/TestOpsSyntax.td   |  22 +
 mlir/test/mlir-tblgen/op-format.mlir          |  10 +
 mlir/test/mlir-tblgen/op-format.td            |   4 +-
 mlir/test/mlir-tblgen/op-properties.td        | 120 +++-
 mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp   | 200 ++++++-
 mlir/tools/mlir-tblgen/OpFormatGen.cpp        | 290 ++++++---
 20 files changed, 1484 insertions(+), 204 deletions(-)

diff --git a/mlir/docs/DefiningDialects/Operations.md b/mlir/docs/DefiningDialects/Operations.md
index 01fadef5c3dbe..b011375bb3f9a 100644
--- a/mlir/docs/DefiningDialects/Operations.md
+++ b/mlir/docs/DefiningDialects/Operations.md
@@ -101,6 +101,9 @@ their semantics via a special [TableGen backend][TableGenBackend]:
 *   The `AttrConstraint` class hierarchy: They are used to specify the
     constraints over attributes. A notable subclass hierarchy is `Attr`, which
     stands for constraints for attributes whose values are of common types.
+*   The `Property` class hierarchy: They are used to specify non-attribute-backed
+    properties that are inherent to operations. This will be expanded to a
+    `PropertyConstraint` class or something similar in the future.
 
 An operation is defined by specializing the `Op` class with concrete contents
 for all the fields it requires. For example, `tf.AvgPool` is defined as
@@ -172,9 +175,9 @@ understanding the operation.
 
 ### Operation arguments
 
-There are two kinds of arguments: operands and attributes. Operands are runtime
-values produced by other ops; while attributes are compile-time known constant
-values, including two categories:
+There are three kinds of arguments: operands, attributes, and properties.
+Operands are runtime values produced by other ops; while attributes and properties
+are compile-time known constant values, including two categories:
 
 1.  Natural attributes: these attributes affect the behavior of the operations
     (e.g., padding for convolution);
@@ -187,8 +190,11 @@ values, including two categories:
     even though they are not materialized, it should be possible to store as an
     attribute.
 
-Both operands and attributes are specified inside the `dag`-typed `arguments`,
-led by `ins`:
+Properties are similar to attributes, except that they are not stored within
+the MLIR context but are stored inline with the operation.
+
+Operands, attributes, and properties  are specified inside the `dag`-typed
+`arguments`, led by `ins`:
 
 ```tablegen
 let arguments = (ins
@@ -196,13 +202,15 @@ let arguments = (ins
   ...
   <attr-constraint>:$<attr-name>,
   ...
+  <property-constraint>:$<property-name>,
 );
 ```
 
 Here `<type-constraint>` is a TableGen `def` from the `TypeConstraint` class
 hierarchy. Similarly, `<attr-constraint>` is a TableGen `def` from the
-`AttrConstraint` class hierarchy. See [Constraints](#constraints) for more
-information.
+`AttrConstraint` class hierarchy and `<property-constraint>` is a subclass
+of `Property` (though a `PropertyConstraint` hierarchy is planned).
+See [Constraints](#constraints) for more information.
 
 There is no requirements on the relative order of operands and attributes; they
 can mix freely. The relative order of operands themselves matters. From each
@@ -324,6 +332,18 @@ Right now, the following primitive constraints are supported:
 
 TODO: Design and implement more primitive constraints
 
+#### Optional and default-valued properties
+
+To declare a property with a default value, use `DefaultValuedProperty<..., "...">`.
+If the property's storage data type is different from its interface type,
+for example, in the case of array properties (which are stored as `SmallVector`s
+but use `ArrayRef` as an interface type), add the storage-type equivalent
+of the default value as the third argument.
+
+To declare an optional property, use `OptionalProperty<...>`.
+This wraps the underlying property in an `std::optional` and gives it a
+default value of `std::nullopt`.
+
 #### Combining constraints
 
 `AllAttrOf` is provided to allow combination of multiple constraints which
@@ -429,6 +449,8 @@ def MyOp : ... {
     I32Attr:$i32_attr,
     F32Attr:$f32_attr,
     ...
+    I32Property:$i32_prop,
+    ...
   );
 
   let results = (outs
@@ -453,7 +475,8 @@ static void build(OpBuilder &odsBuilder, OperationState &odsState,
 static void build(OpBuilder &odsBuilder, OperationState &odsState,
                   Type i32_result, Type f32_result, ...,
                   Value i32_operand, Value f32_operand, ...,
-                  IntegerAttr i32_attr, FloatAttr f32_attr, ...);
+                  IntegerAttr i32_attr, FloatAttr f32_attr, ...,
+                  int32_t i32_prop);
 
 // Each result-type/operand/attribute has a separate parameter. The parameters
 // for attributes are raw values unwrapped with mlir::Attribute instances.
@@ -462,13 +485,15 @@ static void build(OpBuilder &odsBuilder, OperationState &odsState,
 static void build(OpBuilder &odsBuilder, OperationState &odsState,
                   Type i32_result, Type f32_result, ...,
                   Value i32_operand, Value f32_operand, ...,
-                  APInt i32_attr, StringRef f32_attr, ...);
+                  APInt i32_attr, StringRef f32_attr, ...,
+                  int32_t i32_prop, ...);
 
 // Each operand/attribute has a separate parameter but result type is aggregate.
 static void build(OpBuilder &odsBuilder, OperationState &odsState,
                   TypeRange resultTypes,
                   Value i32_operand, Value f32_operand, ...,
-                  IntegerAttr i32_attr, FloatAttr f32_attr, ...);
+                  IntegerAttr i32_attr, FloatAttr f32_attr, ...,
+                  int32_t i32_prop, ...);
 
 // All operands/attributes have aggregate parameters.
 // Generated if return type can be inferred.
@@ -921,8 +946,10 @@ optional-group: `(` then-elements `)` (`:` `(` else-elements `)`)? `?`
 The elements of an optional group have the following requirements:
 
 *   The first element of `then-elements` must either be a attribute, literal,
-    operand, or region.
+    operand,property, or region.
     -   This is because the first element must be optionally parsable.
+    -   If a property is used, it must have an `optionalParser` defined and have a
+        default value.
 *   Exactly one argument variable or type directive within either
     `then-elements` or `else-elements` must be marked as the anchor of the
     group.
@@ -984,6 +1011,8 @@ foo.op is_read_only
 foo.op
 ```
 
+The same logic applies to a `UnitProperty`.
+
 ##### Optional "else" Group
 
 Optional groups also have support for an "else" group of elements. These are
@@ -1026,6 +1055,8 @@ to:
 1.  All operand and result types must appear within the format using the various
     `type` directives, either individually or with the `operands` or `results`
     directives.
+1.  Unless all non-attribute properties appear in the format, the `prop-dict`
+    directive must be present.
 1.  The `attr-dict` directive must always be present.
 1.  Must not contain overlapping information; e.g. multiple instances of
     'attr-dict', types, operands, etc.
diff --git a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
index f6f907f39a4b4..4708006a5390d 100644
--- a/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
+++ b/mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
@@ -59,22 +59,9 @@ class LLVM_IntArithmeticOpWithOverflowFlag<string mnemonic, string instName,
                                    list<Trait> traits = []> :
     LLVM_ArithmeticOpBase<AnySignlessInteger, mnemonic, instName,
     !listconcat([DeclareOpInterfaceMethods<IntegerOverflowFlagsInterface>], traits)> {
-  dag iofArg = (ins EnumProperty<"IntegerOverflowFlags">:$overflowFlags);
+  dag iofArg = (ins EnumProperty<"IntegerOverflowFlags", "", "IntegerOverflowFlags::none">:$overflowFlags);
   let arguments = !con(commonArgs, iofArg);
 
-  let builders = [
-    OpBuilder<(ins "Type":$type, "Value":$lhs, "Value":$rhs,
-                   "IntegerOverflowFlags":$overflowFlags), [{
-      $_state.getOrAddProperties<Properties>().overflowFlags = overflowFlags;
-      build($_builder, $_state, type, lhs, rhs);
-    }]>,
-    OpBuilder<(ins "Value":$lhs, "Value":$rhs,
-                   "IntegerOverflowFlags":$overflowFlags), [{
-      $_state.getOrAddProperties<Properties>().overflowFlags = overflowFlags;
-      build($_builder, $_state, lhs, rhs);
-    }]>
-  ];
-
   string mlirBuilder = [{
     auto op = $_builder.create<$_qualCppClassName>($_location, $lhs, $rhs);
     moduleImport.setIntegerOverflowFlags(inst, op);
diff --git a/mlir/include/mlir/IR/ODSSupport.h b/mlir/include/mlir/IR/ODSSupport.h
index 70e3f986431e2..25d6f3da6a861 100644
--- a/mlir/include/mlir/IR/ODSSupport.h
+++ b/mlir/include/mlir/IR/ODSSupport.h
@@ -33,6 +33,37 @@ convertFromAttribute(int64_t &storage, Attribute attr,
 /// Convert the provided int64_t to an IntegerAttr attribute.
 Attribute convertToAttribute(MLIRContext *ctx, int64_t storage);
 
+/// Convert an IntegerAttr attribute to an int32_t, or return an error if the
+/// attribute isn't an IntegerAttr. If the optional diagnostic is provided an
+/// error message is also emitted.
+LogicalResult
+convertFromAttribute(int32_t &storage, Attribute attr,
+                     function_ref<InFlightDiagnostic()> emitError);
+
+/// Convert the provided int32_t to an IntegerAttr attribute.
+Attribute convertToAttribute(MLIRContext *ctx, int32_t storage);
+
+/// Extract the string from `attr` into `storage`. If `attr` is not a
+/// `StringAttr`, return failure and emit an error into the diagnostic from
+/// `emitError`.
+LogicalResult
+convertFromAttribute(std::string &storage, Attribute attr,
+                     function_ref<InFlightDiagnostic()> emitError);
+
+/// Convert the given string into a StringAttr. Note that this takes a reference
+/// to the storage of a string property, which is an std::string.
+Attribute convertToAttribute(MLIRContext *ctx, const std::string &storage);
+
+/// Extract the boolean from `attr` into `storage`. If `attr` is not a
+/// `BoolAttr`, return failure and emit an error into the diagnostic from
+/// `emitError`.
+LogicalResult
+convertFromAttribute(bool &storage, Attribute attr,
+                     function_ref<InFlightDiagnostic()> emitError);
+
+/// Convert the given string into a BooleanAttr.
+Attribute convertToAttribute(MLIRContext *ctx, bool storage);
+
 /// Convert a DenseI64ArrayAttr to the provided storage. It is expected that the
 /// storage has the same size as the array. An error is returned if the
 /// attribute isn't a DenseI64ArrayAttr or it does not have the same size. If
@@ -49,9 +80,24 @@ LogicalResult
 convertFromAttribute(MutableArrayRef<int32_t> storage, Attribute attr,
                      function_ref<InFlightDiagnostic()> emitError);
 
+/// Convert a DenseI64ArrayAttr to the provided storage, which will be
+/// cleared before writing. An error is returned and emitted to the optional
+/// `emitError` function if the attribute isn't a DenseI64ArrayAttr.
+LogicalResult
+convertFromAttribute(SmallVectorImpl<int64_t> &storage, Attribute attr,
+                     function_ref<InFlightDiagnostic()> emitError);
+
+/// Convert a DenseI32ArrayAttr to the provided storage, which will be
+/// cleared before writing. It is expected that the storage has the same size as
+/// the array. An error is returned and emitted to the optional `emitError`
+/// function if the attribute isn't a DenseI32ArrayAttr.
+LogicalResult
+convertFromAttribute(SmallVectorImpl<int32_t> &storage, Attribute attr,
+                     function_ref<InFlightDiagnostic()> emitError);
+
 /// Convert the provided ArrayRef<int64_t> to a DenseI64ArrayAttr attribute.
 Attribute convertToAttribute(MLIRContext *ctx, ArrayRef<int64_t> storage);
 
 } // namespace mlir
 
-#endif // MLIR_IR_ODSSUPPORT_H
\ No newline at end of file
+#endif // MLIR_IR_ODSSUPPORT_H
diff --git a/mlir/include/mlir/IR/Properties.td b/mlir/include/mlir/IR/Properties.td
index 0babdbbfa05bc..1b6f5aa68c83b 100644
--- a/mlir/include/mlir/IR/Properties.td
+++ b/mlir/include/mlir/IR/Properties.td
@@ -29,7 +29,6 @@ class Property<string storageTypeParam = "", string desc = ""> {
   //
   // Format:
   // - `$_storage` will contain the property in the storage type.
-  // - `$_ctxt` will contain an `MLIRContext *`.
   code convertFromStorage = "$_storage";
 
   // The call expression to build a property storage from the interface type.
@@ -40,24 +39,26 @@ class Property<string storageTypeParam = "", string desc = ""> {
   code assignToStorage = "$_storage = $_value";
 
   // The call expression to convert from the storage type to an attribute.
+  // The resulting attribute must be non-null in non-error cases.
   //
   // Format:
   // - `$_storage` is the storage type value.
   // - `$_ctxt` is a `MLIRContext *`.
   //
-  // The expression must result in an Attribute.
+  // The expression must return an `Attribute` and will be used as a function body.
   code convertToAttribute = [{
-    convertToAttribute($_ctxt, $_storage)
+    return convertToAttribute($_ctxt, $_storage);
   }];
 
   // The call expression to convert from an Attribute to the storage type.
   //
   // Format:
-  // - `$_storage` is the storage type value.
+  // - `$_storage` is a reference to a value of the storage type.
   // - `$_attr` is the attribute.
   // - `$_diag` is a callback to get a Diagnostic to emit error.
   //
-  // The expression must return a LogicalResult
+  // The expression must return a LogicalResult and will be used as a function body
+  // or in other similar contexts.
   code convertFromAttribute = [{
     return convertFromAttribute($_storage, $_attr, $_diag);
   }];
@@ -68,18 +69,67 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // - `$_storage` is the variable to hash.
   //
   // The expression should define a llvm::hash_code.
-  code hashProperty = [{
-    llvm::hash_value($_storage);
+  // If unspecified, defaults to `llvm::hash_value($_storage)`.
+  // The default is not specified in tablegen because many combinators, like
+  // ArrayProperty, can fall back to more efficient implementations of
+  // `hashProperty` when their underlying elements have trivial hashing.
+  code hashProperty = "";
+
+  // The body of the parser for a value of this property.
+  // Format:
+  // - `$_parser` is the OpAsmParser.
+  // - `$_storage` is the location into which the value is to be placed if it is
+  //  present.
+  // - `$_cxtx` is a `MLIRContext *`
+  //
+  // This defines the body of a function (typically a lambda) that returns a
+  // ParseResult. There is an implicit `return success()` at the end of the parser
+  // code.
+  //
+  // When this code executes, `$_storage` will be initialized to the property's
+  // default value (if any, accounting for the storage type override).
+  code parser = [{
+    auto value = ::mlir::FieldParser<}] # storageType # [{>::parse($_parser);
+    if (::mlir::failed(value))
+      return ::mlir::failure();
+    $_storage = std::move(*value);
   }];
 
+  // The body of the parser for a value of this property as the anchor of an optional
+  // group. This should parse the property if possible and do nothing if a value of
+  // the relevant type is not next in the parse stream.
+  // You are not required to define this parser if it cannot be meaningfully
+  // implemented.
+  // This has the same context and substitutions as `parser` except that it is
+  // required to return an OptionalParseResult.
+  //
+  // Note that the printer for a property should always print a non-empty value.
+  //
+  // If the optional parser doesn't parse anything, it should not set
+  // $_storage, since the parser doesn't know if the default value has been
+  // overwritten.
+  code optionalParser = "";
+
+  // The printer for a value of this property.
+  // Format:
+  // - `$_storage` is the storage data.
+  // - `$_printer` is the OpAsmPrinter instance.
+  // - `$_ctxt` is a `MLIRContext *`
+  //
+  // This may be called in an expression context, so variable declarations must
+  // be praced within a new scope.
+  code printer = "$_printer << $_storage";
+
   // The call expression to emit the storage type to bytecode.
   //
   // Format:
   // - `$_storage` is the storage type value.
   // - `$_writer` is a `DialectBytecodeWriter`.
   // - `$_ctxt` is a `MLIRContext *`.
+  //
+  // This will become the body af a function returning void.
   code writeToMlirBytecode = [{
-    writeToMlirBytecode($_writer, $_storage)
+    writeToMlirBytecode($_writer, $_storage);
   }];
 
   // The call expression to read the storage type from bytecode.
@@ -88,13 +138,31 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // - `$_storage` is the storage type value.
   // - `$_reader` is a `DialectBytecodeReader`.
   // - `$_ctxt` is a `MLIRContext *`.
+  //
+  // This will become the body of a function returning LogicalResult.
+  // There is an implicit `return success()` at the end of this function.
+  //
+  // When this code executes, `$_storage` will be initialized to the property's
+  // default value (if any, accounting for the storage type override).
   code readFromMlirBytecode = [{
     if (::mlir::failed(readFromMlirBytecode($_reader, $_storage)))
       return ::mlir::failure();
   }];
 
-  // Default value for the property.
-  string defaultValue = ?;
+  // Base definition for the property. (Will be) used for `OptionalProperty` and
+  // such cases, analogously to `baseAttr`.
+  Property baseProperty = ?;
+
+  // Default value for the property within its storage. This should be an expression
+  // of type `interfaceType` and should be comparable with other types of that
+  // interface typ with `==`. The empty string means there is no default value.
+  string defaultValue = "";
+
+  // If set, the default value the storage of the property should be initilized to.
+  // This is only needed when the storage and interface types of the property
+  // are distinct (ex. SmallVector for storage vs. ArrayRef for interfacing), as it
+  // will fall back to defaultValue when unspecified.
+  string storageTypeValueOverride = "";
 }
 
 /// Implementation of the Property class's `readFromMlirBytecode` field using
@@ -133,12 +201,16 @@ defvar writeMlirBytecodeWithConvertToAttribute = [{
 // Primitive property kinds
 
 // Any kind of integer stored as properties.
-class IntProperty<string storageTypeParam = "", string desc = ""> :
+class IntProperty<string storageTypeParam, string desc = ""> :
     Property<storageTypeParam, desc> {
-  code writeToMlirBytecode = [{
+  let summary = !if(!empty(desc), storageTypeParam, desc);
+  let optionalParser = [{
+    return $_parser.parseOptionalInteger($_storage);
+  }];
+  let writeToMlirBytecode = [{
     $_writer.writeVarInt($_storage);
   }];
-  code readFromMlirBytecode = [{
+  let readFromMlirBytecode = [{
     uint64_t val;
     if (failed($_reader.readVarInt(val)))
       return ::mlir::failure();
@@ -146,24 +218,470 @@ class IntProperty<string storageTypeParam = "", string desc = ""> :
   }];
 }
 
-class ArrayProperty<string storageTypeParam = "", int n, string desc = ""> :
-  Property<storageTypeParam # "[" # n # "]", desc> {
-  let interfaceType = "::llvm::ArrayRef<" # storageTypeParam # ">";
-  let convertFromStorage = "$_storage";
-  let assignToStorage = "::llvm::copy($_value, $_storage)";
-}
+def I32Property : IntProperty<"int32_t">;
+def I64Property : IntProperty<"int64_t">;
 
-class EnumProperty<string storageTypeParam, string desc = ""> :
+class EnumProperty<string storageTypeParam, string desc = "", string default = ""> :
     Property<storageTypeParam, desc> {
-  code writeToMlirBytecode = [{
+  // TODO: take advantage of EnumAttrInfo and the like to make this share nice
+  // parsing code with EnumAttr.
+  let writeToMlirBytecode = [{
     $_writer.writeVarInt(static_cast<uint64_t>($_storage));
   }];
-  code readFromMlirBytecode = [{
+  let readFromMlirBytecode = [{
     uint64_t val;
     if (failed($_reader.readVarInt(val)))
       return ::mlir::failure();
     $_storage = static_cast<}] # storageTypeParam # [{>(val);
   }];
+  let defaultValue = default;
 }
 
+def StringProperty : Property<"std::string", "string"> {
+  let interfaceType = "::llvm::StringRef";
+  let convertFromStorage = "::llvm::StringRef{$_storage}";
+  let assignToStorage = "$_storage = $_value.str()";
+  let optionalParser = [{
+    if (::mlir::failed($_parser.parseOptionalString(&$_storage)))
+      return std::nullopt;
+  }];
+  let printer = "$_printer.printString($_storage)";
+  let readFromMlirBytecode = [{
+    StringRef val;
+    if (::mlir::failed($_reader.readString(val)))
+      return ::mlir::failure();
+    $_storage = val.str();
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedString($_storage);
+  }];
+}
+
+def BoolProperty : IntProperty<"bool", "boolean"> {
+  let printer = [{ $_printer << ($_storage ? "true" : "false") }];
+  let readFromMlirBytecode = [{
+    return $_reader.readBool($_storage);
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage);
+  }];
+}
+
+def UnitProperty : Property<"bool", "unit property"> {
+  let summary = "unit property";
+  let description = [{
+    A property whose presence or abscence is used as a flag.
+
+    This is stored as a boolean that defaults to false, and is named UnitProperty
+    by analogy with UnitAttr, which has the more comprehensive rationale and
+    explains the less typical syntax.
+
+    Note that this attribute does have a syntax for the false case to allow for its
+    use in contexts where default values shouldn't be elided.
+  }];
+  let defaultValue = "false";
+
+  let convertToAttribute = [{
+    if ($_storage)
+      return ::mlir::UnitAttr::get($_ctxt);
+    else
+      return ::mlir::BoolAttr::get($_ctxt, false);
+  }];
+  let convertFromAttribute = [{
+    if (::llvm::isa<::mlir::UnitAttr>($_attr)) {
+      $_storage = true;
+      return ::mlir::success();
+    }
+    if (auto boolAttr = ::llvm::dyn_cast<::mlir::BoolAttr>($_attr)) {
+      $_storage = boolAttr.getValue();
+      return ::mlir::success();
+    }
+    return ::mlir::failure();
+  }];
+
+  let parser = [{
+    ::llvm::StringRef keyword;
+    if (::mlir::failed($_parser.parseOptionalKeyword(&keyword,
+        {"unit", "unit_absent"})))
+      return $_parser.emitError($_parser.getCurrentLocation(),
+        "expected 'unit' or 'unit_absent'");
+    $_storage = (keyword == "unit");
+  }];
+
+  let optionalParser = [{
+    ::llvm::StringRef keyword;
+    if (::mlir::failed($_parser.parseOptionalKeyword(&keyword,
+        {"unit", "unit_absent"})))
+      return std::nullopt;
+    $_storage = (keyword == "unit");
+  }];
+
+  let printer = [{
+    $_printer << ($_storage ? "unit" : "unit_absent")
+  }];
+
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage);
+  }];
+  let readFromMlirBytecode = [{
+    if (::mlir::failed($_reader.readBool($_storage)))
+      return ::mlir::failure();
+  }];
+}
+
+//===----------------------------------------------------------------------===//
+// Primitive property combinators
+
+/// Create a variable named `name` of `prop`'s storage type that is initialized
+/// to the correct default value, if there is one.
+class _makePropStorage<Property prop, string name> {
+  code ret = prop.storageType # " " # name
+      # !cond(!not(!empty(prop.storageTypeValueOverride)) : " = " # prop.storageTypeValueOverride,
+        !not(!empty(prop.defaultValue)) : " = " # prop.defaultValue,
+        true : "") # ";";
+}
+
+/// The generic class for arrays of some other property, which is stored as a
+/// `SmallVector` of that property. This uses an `ArrayAttr` as its attribute form
+/// though subclasses can override this, as is the case with IntArrayAttr below.
+class ArrayProperty<Property elem = Property<>, string desc = ""> :
+  Property<"::llvm::SmallVector<" # elem.storageType # ">", desc> {
+  let summary = "array of " # elem.summary;
+  let interfaceType = "::llvm::ArrayRef<" # elem.storageType # ">";
+  let convertFromStorage = "::llvm::ArrayRef<" # elem.storageType # ">{$_storage}";
+  let assignToStorage = "$_storage.assign($_value.begin(), $_value.end())";
+
+  let convertFromAttribute = [{
+    auto arrayAttr = ::llvm::dyn_cast_if_present<::mlir::ArrayAttr>($_attr);
+    if (!arrayAttr)
+      return $_diag() << "expected array attribute";
+    for (::mlir::Attribute elemAttr : arrayAttr) {
+      }] # _makePropStorage<elem, "elemVal">.ret # [{
+      auto elemRes = [&](Attribute propAttr, }] # elem.storageType # [{& propStorage) -> ::mlir::LogicalResult {
+        }] # !subst("$_attr", "propAttr",
+          !subst("$_storage", "propStorage", elem.convertFromAttribute)) # [{
+      }(elemAttr, elemVal);
+      if (::mlir::failed(elemRes))
+        return ::mlir::failure();
+      $_storage.push_back(std::move(elemVal));
+    }
+    return ::mlir::success();
+  }];
+
+  let convertToAttribute = [{
+    SmallVector<Attribute> elems;
+    for (const auto& elemVal : $_storage) {
+      auto elemAttr = [&](const }] # elem.storageType #[{& propStorage) -> ::mlir::Attribute {
+        }] # !subst("$_storage", "propStorage", elem.convertToAttribute) # [{
+      }(elemVal);
+      elems.push_back(elemAttr);
+    }
+    return ::mlir::ArrayAttr::get($_ctxt, elems);
+  }];
+
+  defvar theParserBegin = [{
+    auto& storage = $_storage;
+    auto parseElemFn = [&]() -> ::mlir::ParseResult {
+      }] # _makePropStorage<elem, "elemVal">.ret # [{
+      auto elemParse = [&](}] # elem.storageType # [{& propStorage) -> ::mlir::ParseResult {
+        }] # !subst("$_storage", "propStorage", elem.parser) # [{
+        return ::mlir::success();
+       }(elemVal);
+      if (::mlir::failed(elemParse))
+        return ::mlir::failure();
+      storage.push_back(std::move(elemVal));
+      return ::mlir::success();
+    };
+    }];
+  let parser = theParserBegin # [{
+    return $_parser.parseCommaSeparatedList(
+      ::mlir::OpAsmParser::Delimiter::Square, parseElemFn);
+  }];
+  // Hack around the lack of a peek method
+  let optionalParser = theParserBegin # [{
+    auto oldLoc = $_parser.getCurrentLocation();
+    auto parseResult = $_parser.parseCommaSeparatedList(
+      ::mlir::OpAsmParser::Delimiter::OptionalSquare, parseElemFn);
+    if (::mlir::failed(parseResult))
+      return ::mlir::failure();
+    auto newLoc = $_parser.getCurrentLocation();
+    if (oldLoc == newLoc)
+      return std::nullopt;
+    return ::mlir::success();
+  }];
+
+  let printer = [{ [&](){
+    $_printer << "[";
+    auto elemPrinter = [&](const }] # elem.storageType # [{& elemVal) {
+      }] # !subst("$_storage", "elemVal", elem.printer) #[{;
+    };
+    ::llvm::interleaveComma($_storage, $_printer, elemPrinter);
+    $_printer << "]";
+  }()}];
+
+  let readFromMlirBytecode = [{
+    uint64_t length;
+    if (::mlir::failed($_reader.readVarInt(length)))
+      return ::mlir::failure();
+    $_storage.reserve(length);
+    for (uint64_t i = 0; i < length; ++i) {
+      }]# _makePropStorage<elem, "elemVal">.ret # [{
+      auto elemRead = [&](}] # elem.storageType # [{& propStorage) -> ::mlir::LogicalResult {
+        }] # !subst("$_storage", "propStorage", elem.readFromMlirBytecode) # [{;
+        return ::mlir::success();
+      }(elemVal);
+      if (::mlir::failed(elemRead))
+        return ::mlir::failure();
+      $_storage.push_back(std::move(elemVal));
+    }
+  }];
+
+  let writeToMlirBytecode = [{
+    $_writer.writeVarInt($_storage.size());
+    for (const auto& elemVal : $_storage) {
+      [&]() {
+        }] # !subst("$_storage", "elemVal", elem.writeToMlirBytecode) #[{;
+      }();
+    }
+  }];
+
+  // There's no hash_value for SmallVector<T>, so we construct the ArrayRef ourselves.
+  // In the non-trivial case, we define a mapped range to get internal hash
+  // codes.
+  let hashProperty = !if(!empty(elem.hashProperty),
+    [{::llvm::hash_value(::llvm::ArrayRef<}] # elem.storageType # [{>{$_storage})}],
+    [{[&]() -> ::llvm::hash_code {
+        auto getElemHash = [](const auto& propStorage) -> ::llvm::hash_code {
+          return }] # !subst("$_storage", "propStorage", elem.hashProperty) # [{;
+        };
+        auto mapped = ::llvm::map_range($_storage, getElemHash);
+        return ::llvm::hash_combine_range(mapped.begin(), mapped.end());
+      }()
+    }]);
+}
+
+class IntArrayProperty<string storageTypeParam = "", string desc = ""> :
+    ArrayProperty<IntProperty<storageTypeParam, desc>> {
+  // Bring back the trivial conversions we don't get in the general case.
+  let convertFromAttribute = [{
+    return convertFromAttribute($_storage, $_attr, $_diag);
+  }];
+  let convertToAttribute = [{
+    return convertToAttribute($_ctxt, $_storage);
+  }];
+}
+
+/// Class for giving a property a default value.
+/// This doesn't change anything about the property other than giving it a default
+/// which can be used by ODS to elide printing.
+class DefaultValuedProperty<Property p, string default = "", string storageDefault = ""> : Property<p.storageType, p.summary> {
+  let defaultValue = default;
+  let storageTypeValueOverride = storageDefault;
+  let baseProperty = p;
+  // Keep up to date with `Property` above.
+  let summary = p.summary;
+  let description = p.description;
+  let storageType = p.storageType;
+  let interfaceType = p.interfaceType;
+  let convertFromStorage = p.convertFromStorage;
+  let assignToStorage = p.assignToStorage;
+  let convertToAttribute = p.convertToAttribute;
+  let convertFromAttribute = p.convertFromAttribute;
+  let hashProperty = p.hashProperty;
+  let parser = p.parser;
+  let optionalParser = p.optionalParser;
+  let printer = p.printer;
+  let readFromMlirBytecode = p.readFromMlirBytecode;
+  let writeToMlirBytecode = p.writeToMlirBytecode;
+}
+
+/// An optional property, stored as an std::optional<p.storageType>
+/// interfaced with as an std::optional<p.interfaceType>..
+/// The syntax is `none` (or empty string if elided) for an absent value or
+/// `some<[underlying property]>` when a value is set.
+///
+/// As a special exception, if the underlying property has an optional parser and
+/// no default value (ex. an integer property), the printer will skip the `some`
+/// bracketing and delegate to the optional parser. In that case, the syntax is the
+/// syntax of the underlying property, or the keyword `none` in the rare cases that
+/// it is needed. This behavior can be disabled by setting `canDelegateParsing` to 0.
+class OptionalProperty<Property p, bit canDelegateParsing = 1>
+    : Property<"std::optional<" # p.storageType # ">", "optional " # p.summary> {
+
+  // In the cases where the underlying attribute is plain old data that's passed by
+  // value, the conversion code is trivial.
+  defvar hasTrivialStorage = !and(!eq(p.convertFromStorage, "$_storage"),
+    !eq(p.assignToStorage, "$_storage = $_value"),
+    !eq(p.storageType, p.interfaceType));
+
+  defvar delegatesParsing = !and(!empty(p.defaultValue),
+    !not(!empty(p.optionalParser)), canDelegateParsing);
+
+  let interfaceType = "std::optional<" # p.interfaceType # ">";
+  let defaultValue = "std::nullopt";
+
+  let convertFromStorage = !if(hasTrivialStorage,
+    p.convertFromStorage,
+    [{($_storage.has_value() ? std::optional<}] # p.interfaceType # ">{"
+      # !subst("$_storage", "(*($_storage))", p.convertFromStorage)
+      # [{} : std::nullopt)}]);
+  let assignToStorage = !if(hasTrivialStorage,
+    p.assignToStorage,
+    [{[&]() {
+      if (!$_value.has_value()) {
+        $_storage = std::nullopt;
+        return;
+      }
+      }] # _makePropStorage<p, "presentVal">.ret # [{
+      [&](}] # p.storageType # [{& propStorage) {
+        }] # !subst("$_storage", "propStorage",
+          !subst("$_value", "(*($_value))", p.assignToStorage)) # [{;
+      }(presentVal);
+      $_storage = std::move(presentVal);
+    }()}]);
+
+  let convertFromAttribute = [{
+    auto arrayAttr = ::llvm::dyn_cast<::mlir::ArrayAttr>($_attr);
+    if (!arrayAttr)
+      return $_diag() << "expected optional properties to materialize as arrays";
+    if (arrayAttr.size() > 1)
+      return $_diag() << "expected optional properties to become 0- or 1-element arrays";
+    if (arrayAttr.empty()) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    ::mlir::Attribute presentAttr = arrayAttr[0];
+    }] # _makePropStorage<p, "presentVal">.ret # [{
+    auto presentRes = [&](Attribute propAttr, }] # p.storageType # [{& propStorage) -> ::mlir::LogicalResult {
+      }] # !subst("$_storage", "propStorage",
+          !subst("$_attr", "propAttr", p.convertFromAttribute)) # [{
+    }(presentAttr, presentVal);
+    if (::mlir::failed(presentRes))
+      return ::mlir::failure();
+    $_storage = std::move(presentVal);
+    return ::mlir::success();
+  }];
+
+  let convertToAttribute = [{
+    if (!$_storage.has_value()) {
+      return ::mlir::ArrayAttr::get($_ctxt, {});
+    }
+    auto attr = [&]() -> ::mlir::Attribute {
+      }] # !subst("$_storage", "(*($_storage))", p.convertToAttribute) # [{
+    }();
+    return ::mlir::ArrayAttr::get($_ctxt, {attr});
+  }];
+
+  defvar delegatedParserBegin = [{
+    if (::mlir::succeeded($_parser.parseOptionalKeyword("none"))) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    }] #_makePropStorage<p, "presentVal">.ret # [{
+    auto delegParseResult = [&](}] # p.storageType # [{& propStorage) -> ::mlir::OptionalParseResult {
+    }] # !subst("$_storage", "propStorage", p.optionalParser) # [{
+        return ::mlir::success();
+    }(presentVal);
+    if (!delegParseResult.has_value()) {
+  }];
+
+  defvar delegatedParserEnd = [{
+    }
+    if (delegParseResult.has_value() && ::mlir::failed(*delegParseResult))
+      return ::mlir::failure();
+    $_storage = std::move(presentVal);
+    return ::mlir::success();
+  }];
+  // If we're being explicitly called for our parser, we're expecting to have been
+  // printede into a context where the default value isn't elided. Therefore,
+  // not-present from the underlying parser is a failure.
+  defvar delegatedParser = delegatedParserBegin # [{
+    return ::mlir::failure();
+  }] # delegatedParserEnd;
+  defvar delegatedOptionalParser = delegatedParserBegin # [{
+      return std::nullopt;
+  }] # delegatedParserEnd;
+
+  defvar generalParserBegin = [{
+    ::llvm::StringRef keyword;
+    if (::mlir::failed($_parser.parseOptionalKeyword(&keyword, {"none", "some"}))) {
+  }];
+  defvar generalParserEnd = [{
+    }
+    if (keyword == "none") {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    if (::mlir::failed($_parser.parseLess()))
+      return ::mlir::failure();
+    }] # _makePropStorage<p, "presentVal">.ret # [{
+    auto presentParse = [&](}] # p.storageType # [{& propStorage) -> ::mlir::ParseResult {
+      }] # !subst("$_storage", "propStorage", p.parser) # [{
+      return ::mlir::success();
+    }(presentVal);
+    if (presentParse || $_parser.parseGreater())
+      return ::mlir::failure();
+    $_storage = std::move(presentVal);
+  }];
+  defvar generalParser = generalParserBegin # [{
+    return $_parser.emitError($_parser.getCurrentLocation(), "expected 'none' or 'some<prop>'");
+  }] # generalParserEnd;
+  defvar generalOptionalParser = generalParserBegin # [{
+    return std::nullopt;
+  }] # generalParserEnd;
+
+  let parser = !if(delegatesParsing, delegatedParser, generalParser);
+  let optionalParser = !if(delegatesParsing,
+    delegatedOptionalParser, generalOptionalParser);
+
+  defvar delegatedPrinter = [{
+    [&]() {
+      if (!$_storage.has_value()) {
+        $_printer << "none";
+        return;
+      }
+      }] # !subst("$_storage", "(*($_storage))", p.printer) # [{;
+    }()}];
+  defvar generalPrinter = [{
+      [&]() {
+        if (!$_storage.has_value()) {
+          $_printer << "none";
+          return;
+        }
+        $_printer << "some<";
+        }] # !subst("$_storage", "(*($_storage))", p.printer) # [{;
+        $_printer << ">";
+      }()}];
+  let printer = !if(delegatesParsing, delegatedPrinter, generalPrinter);
+
+  let readFromMlirBytecode = [{
+    bool isPresent = false;
+    if (::mlir::failed($_reader.readBool(isPresent)))
+      return ::mlir::failure();
+    if (!isPresent) {
+      $_storage = std::nullopt;
+      return ::mlir::success();
+    }
+    }] # _makePropStorage<p, "presentVal">.ret # [{
+    auto presentResult = [&](}] # p.storageType # [{& propStorage) -> ::mlir::LogicalResult {
+      }] # !subst("$_storage", "propStorage", p.readFromMlirBytecode) # [{;
+      return ::mlir::success();
+    }(presentVal);
+    if (::mlir::failed(presentResult))
+      return ::mlir::failure();
+    $_storage = std::move(presentVal);
+  }];
+  let writeToMlirBytecode = [{
+    $_writer.writeOwnedBool($_storage.has_value());
+    if (!$_storage.has_value())
+      return;
+  }] # !subst("$_storage", "(*($_storage))", p.writeToMlirBytecode);
+
+  let hashProperty = !if(!empty(p.hashProperty), p.hashProperty,
+    [{ ::llvm::hash_value($_storage.has_value() ? std::optional<::llvm::hash_code>{}] #
+      !subst("$_storage", "(*($_storage))", p.hashProperty) #[{} : std::nullopt) }]);
+  assert !or(!not(delegatesParsing), !eq(defaultValue, "std::nullopt")),
+    "For delegated parsing to be used, the default value must be nullopt. " #
+    "To use a non-trivial default, set the canDelegateParsing argument to 0";
+}
 #endif // PROPERTIES
diff --git a/mlir/include/mlir/TableGen/Operator.h b/mlir/include/mlir/TableGen/Operator.h
index cc5853c044e97..768291a3a7267 100644
--- a/mlir/include/mlir/TableGen/Operator.h
+++ b/mlir/include/mlir/TableGen/Operator.h
@@ -384,7 +384,7 @@ class Operator {
   SmallVector<NamedAttribute, 4> attributes;
 
   /// The properties of the op.
-  SmallVector<NamedProperty> properties;
+  SmallVector<NamedProperty, 4> properties;
 
   /// The arguments of the op (operands and native attributes).
   SmallVector<Argument, 4> arguments;
diff --git a/mlir/include/mlir/TableGen/Property.h b/mlir/include/mlir/TableGen/Property.h
index d0d6f4940c7c0..702e6756e6a95 100644
--- a/mlir/include/mlir/TableGen/Property.h
+++ b/mlir/include/mlir/TableGen/Property.h
@@ -35,12 +35,20 @@ class Property {
 public:
   explicit Property(const llvm::Record *record);
   explicit Property(const llvm::DefInit *init);
-  Property(StringRef storageType, StringRef interfaceType,
-           StringRef convertFromStorageCall, StringRef assignToStorageCall,
-           StringRef convertToAttributeCall, StringRef convertFromAttributeCall,
+  Property(StringRef summary, StringRef description, StringRef storageType,
+           StringRef interfaceType, StringRef convertFromStorageCall,
+           StringRef assignToStorageCall, StringRef convertToAttributeCall,
+           StringRef convertFromAttributeCall, StringRef parserCall,
+           StringRef optionalParserCall, StringRef printerCall,
            StringRef readFromMlirBytecodeCall,
            StringRef writeToMlirBytecodeCall, StringRef hashPropertyCall,
-           StringRef defaultValue);
+           StringRef defaultValue, StringRef storageTypeValueOverride);
+
+  // Returns the summary (for error messages) of this property's type.
+  StringRef getSummary() const { return summary; }
+
+  // Returns the description of this property.
+  StringRef getDescription() const { return description; }
 
   // Returns the storage type.
   StringRef getStorageType() const { return storageType; }
@@ -66,6 +74,19 @@ class Property {
     return convertFromAttributeCall;
   }
 
+  // Returns the method call which parses this property from textual MLIR.
+  StringRef getParserCall() const { return parserCall; }
+
+  // Returns true if this property has defined an optional parser.
+  bool hasOptionalParser() const { return !optionalParserCall.empty(); }
+
+  // Returns the method call which optionally parses this property from textual
+  // MLIR.
+  StringRef getOptionalParserCall() const { return optionalParserCall; }
+
+  // Returns the method call which prints this property to textual MLIR.
+  StringRef getPrinterCall() const { return printerCall; }
+
   // Returns the method call which reads this property from
   // bytecode and assign it to the storage.
   StringRef getReadFromMlirBytecodeCall() const {
@@ -87,6 +108,24 @@ class Property {
   // Returns the default value for this Property.
   StringRef getDefaultValue() const { return defaultValue; }
 
+  // Returns whether this Property has a default storage-type value that is
+  // distinct from its default interface-type value.
+  bool hasStorageTypeValueOverride() const {
+    return !storageTypeValueOverride.empty();
+  }
+
+  StringRef getStorageTypeValueOverride() const {
+    return storageTypeValueOverride;
+  }
+
+  // Returns this property's TableGen def-name.
+  StringRef getPropertyDefName() const;
+
+  // Returns the base-level property that this Property constraint is based on
+  // or the Property itself otherwise. (Note: there are currently no
+  // property constraints, this function is added for future-proofing)
+  Property getBaseProperty() const;
+
   // Returns the TableGen definition this Property was constructed from.
   const llvm::Record &getDef() const { return *def; }
 
@@ -95,16 +134,22 @@ class Property {
   const llvm::Record *def;
 
   // Elements describing a Property, in general fetched from the record.
+  StringRef summary;
+  StringRef description;
   StringRef storageType;
   StringRef interfaceType;
   StringRef convertFromStorageCall;
   StringRef assignToStorageCall;
   StringRef convertToAttributeCall;
   StringRef convertFromAttributeCall;
+  StringRef parserCall;
+  StringRef optionalParserCall;
+  StringRef printerCall;
   StringRef readFromMlirBytecodeCall;
   StringRef writeToMlirBytecodeCall;
   StringRef hashPropertyCall;
   StringRef defaultValue;
+  StringRef storageTypeValueOverride;
 };
 
 // A struct wrapping an op property and its name together
diff --git a/mlir/lib/IR/ODSSupport.cpp b/mlir/lib/IR/ODSSupport.cpp
index 6e968d62e61c7..d56c75ede9849 100644
--- a/mlir/lib/IR/ODSSupport.cpp
+++ b/mlir/lib/IR/ODSSupport.cpp
@@ -33,6 +33,50 @@ Attribute mlir::convertToAttribute(MLIRContext *ctx, int64_t storage) {
   return IntegerAttr::get(IntegerType::get(ctx, 64), storage);
 }
 
+LogicalResult
+mlir::convertFromAttribute(int32_t &storage, Attribute attr,
+                           function_ref<InFlightDiagnostic()> emitError) {
+  auto valueAttr = dyn_cast<IntegerAttr>(attr);
+  if (!valueAttr) {
+    emitError() << "expected IntegerAttr for key `value`";
+    return failure();
+  }
+  storage = valueAttr.getValue().getSExtValue();
+  return success();
+}
+Attribute mlir::convertToAttribute(MLIRContext *ctx, int32_t storage) {
+  return IntegerAttr::get(IntegerType::get(ctx, 32), storage);
+}
+
+LogicalResult
+mlir::convertFromAttribute(std::string &storage, Attribute attr,
+                           function_ref<InFlightDiagnostic()> emitError) {
+  auto valueAttr = dyn_cast<StringAttr>(attr);
+  if (!valueAttr)
+    return emitError()
+           << "expected string property to come from string attribute";
+  storage = valueAttr.getValue().str();
+  return success();
+}
+Attribute mlir::convertToAttribute(MLIRContext *ctx,
+                                   const std::string &storage) {
+  return StringAttr::get(ctx, storage);
+}
+
+LogicalResult
+mlir::convertFromAttribute(bool &storage, Attribute attr,
+                           function_ref<InFlightDiagnostic()> emitError) {
+  auto valueAttr = dyn_cast<BoolAttr>(attr);
+  if (!valueAttr)
+    return emitError()
+           << "expected string property to come from string attribute";
+  storage = valueAttr.getValue();
+  return success();
+}
+Attribute mlir::convertToAttribute(MLIRContext *ctx, bool storage) {
+  return BoolAttr::get(ctx, storage);
+}
+
 template <typename DenseArrayTy, typename T>
 LogicalResult
 convertDenseArrayFromAttr(MutableArrayRef<T> storage, Attribute attr,
@@ -64,6 +108,33 @@ mlir::convertFromAttribute(MutableArrayRef<int32_t> storage, Attribute attr,
                                                       "DenseI32ArrayAttr");
 }
 
+template <typename DenseArrayTy, typename T>
+LogicalResult
+convertDenseArrayFromAttr(SmallVectorImpl<T> &storage, Attribute attr,
+                          function_ref<InFlightDiagnostic()> emitError,
+                          StringRef denseArrayTyStr) {
+  auto valueAttr = dyn_cast<DenseArrayTy>(attr);
+  if (!valueAttr) {
+    emitError() << "expected " << denseArrayTyStr << " for key `value`";
+    return failure();
+  }
+  storage.resize_for_overwrite(valueAttr.size());
+  llvm::copy(valueAttr.asArrayRef(), storage.begin());
+  return success();
+}
+LogicalResult
+mlir::convertFromAttribute(SmallVectorImpl<int64_t> &storage, Attribute attr,
+                           function_ref<InFlightDiagnostic()> emitError) {
+  return convertDenseArrayFromAttr<DenseI64ArrayAttr>(storage, attr, emitError,
+                                                      "DenseI64ArrayAttr");
+}
+LogicalResult
+mlir::convertFromAttribute(SmallVectorImpl<int32_t> &storage, Attribute attr,
+                           function_ref<InFlightDiagnostic()> emitError) {
+  return convertDenseArrayFromAttr<DenseI32ArrayAttr>(storage, attr, emitError,
+                                                      "DenseI32ArrayAttr");
+}
+
 Attribute mlir::convertToAttribute(MLIRContext *ctx,
                                    ArrayRef<int64_t> storage) {
   return DenseI64ArrayAttr::get(ctx, storage);
diff --git a/mlir/lib/TableGen/Property.cpp b/mlir/lib/TableGen/Property.cpp
index e61d2fd2480fd..b86b87df91c60 100644
--- a/mlir/lib/TableGen/Property.cpp
+++ b/mlir/lib/TableGen/Property.cpp
@@ -33,16 +33,23 @@ static StringRef getValueAsString(const Init *init) {
 }
 
 Property::Property(const Record *def)
-    : Property(getValueAsString(def->getValueInit("storageType")),
-               getValueAsString(def->getValueInit("interfaceType")),
-               getValueAsString(def->getValueInit("convertFromStorage")),
-               getValueAsString(def->getValueInit("assignToStorage")),
-               getValueAsString(def->getValueInit("convertToAttribute")),
-               getValueAsString(def->getValueInit("convertFromAttribute")),
-               getValueAsString(def->getValueInit("readFromMlirBytecode")),
-               getValueAsString(def->getValueInit("writeToMlirBytecode")),
-               getValueAsString(def->getValueInit("hashProperty")),
-               getValueAsString(def->getValueInit("defaultValue"))) {
+    : Property(
+          getValueAsString(def->getValueInit("summary")),
+          getValueAsString(def->getValueInit("description")),
+          getValueAsString(def->getValueInit("storageType")),
+          getValueAsString(def->getValueInit("interfaceType")),
+          getValueAsString(def->getValueInit("convertFromStorage")),
+          getValueAsString(def->getValueInit("assignToStorage")),
+          getValueAsString(def->getValueInit("convertToAttribute")),
+          getValueAsString(def->getValueInit("convertFromAttribute")),
+          getValueAsString(def->getValueInit("parser")),
+          getValueAsString(def->getValueInit("optionalParser")),
+          getValueAsString(def->getValueInit("printer")),
+          getValueAsString(def->getValueInit("readFromMlirBytecode")),
+          getValueAsString(def->getValueInit("writeToMlirBytecode")),
+          getValueAsString(def->getValueInit("hashProperty")),
+          getValueAsString(def->getValueInit("defaultValue")),
+          getValueAsString(def->getValueInit("storageTypeValueOverride"))) {
   this->def = def;
   assert((def->isSubClassOf("Property") || def->isSubClassOf("Attr")) &&
          "must be subclass of TableGen 'Property' class");
@@ -50,22 +57,44 @@ Property::Property(const Record *def)
 
 Property::Property(const DefInit *init) : Property(init->getDef()) {}
 
-Property::Property(StringRef storageType, StringRef interfaceType,
+Property::Property(StringRef summary, StringRef description,
+                   StringRef storageType, StringRef interfaceType,
                    StringRef convertFromStorageCall,
                    StringRef assignToStorageCall,
                    StringRef convertToAttributeCall,
-                   StringRef convertFromAttributeCall,
+                   StringRef convertFromAttributeCall, StringRef parserCall,
+                   StringRef optionalParserCall, StringRef printerCall,
                    StringRef readFromMlirBytecodeCall,
                    StringRef writeToMlirBytecodeCall,
-                   StringRef hashPropertyCall, StringRef defaultValue)
-    : storageType(storageType), interfaceType(interfaceType),
+                   StringRef hashPropertyCall, StringRef defaultValue,
+                   StringRef storageTypeValueOverride)
+    : summary(summary), description(description), storageType(storageType),
+      interfaceType(interfaceType),
       convertFromStorageCall(convertFromStorageCall),
       assignToStorageCall(assignToStorageCall),
       convertToAttributeCall(convertToAttributeCall),
       convertFromAttributeCall(convertFromAttributeCall),
+      parserCall(parserCall), optionalParserCall(optionalParserCall),
+      printerCall(printerCall),
       readFromMlirBytecodeCall(readFromMlirBytecodeCall),
       writeToMlirBytecodeCall(writeToMlirBytecodeCall),
-      hashPropertyCall(hashPropertyCall), defaultValue(defaultValue) {
+      hashPropertyCall(hashPropertyCall), defaultValue(defaultValue),
+      storageTypeValueOverride(storageTypeValueOverride) {
   if (storageType.empty())
     storageType = "Property";
 }
+
+StringRef Property::getPropertyDefName() const {
+  if (def->isAnonymous()) {
+    return getBaseProperty().def->getName();
+  }
+  return def->getName();
+}
+
+Property Property::getBaseProperty() const {
+  if (const auto *defInit =
+          llvm::dyn_cast<llvm::DefInit>(def->getValueInit("baseProperty"))) {
+    return Property(defInit).getBaseProperty();
+  }
+  return *this;
+}
diff --git a/mlir/test/IR/properties.mlir b/mlir/test/IR/properties.mlir
index 01ea856b03168..418b81dcbb034 100644
--- a/mlir/test/IR/properties.mlir
+++ b/mlir/test/IR/properties.mlir
@@ -2,10 +2,10 @@
 // # RUN: mlir-opt %s -mlir-print-op-generic -split-input-file  | mlir-opt -mlir-print-op-generic | FileCheck %s --check-prefix=GENERIC
 
 // CHECK:   test.with_properties
-// CHECK-SAME: <{a = 32 : i64, array = array<i64: 1, 2, 3, 4>, b = "foo"}>{{$}}
+// CHECK-SAME: a = 32, b = "foo", c = "bar", flag = true, array = [1, 2, 3, 4]{{$}}
 // GENERIC:   "test.with_properties"()
-// GENERIC-SAME: <{a = 32 : i64, array = array<i64: 1, 2, 3, 4>, b = "foo"}> : () -> ()
-test.with_properties <{a = 32 : i64, array = array<i64: 1, 2, 3, 4>, b = "foo"}>
+// GENERIC-SAME: <{a = 32 : i64, array = array<i64: 1, 2, 3, 4>, b = "foo", c = "bar", flag = true}> : () -> ()
+test.with_properties a = 32, b = "foo", c = "bar", flag = true, array = [1, 2, 3, 4]
 
 // CHECK:   test.with_nice_properties
 // CHECK-SAME:    "foo bar" is -3{{$}}
@@ -34,18 +34,48 @@ test.using_property_in_custom [1, 4, 20]
 // GENERIC-SAME: }>
 test.using_property_ref_in_custom 1 + 4 = 5
 
-// CHECK:   test.with_default_valued_properties {{$}}
+// CHECK:   test.with_default_valued_properties na{{$}}
 // GENERIC: "test.with_default_valued_properties"()
-// GENERIC-SAME:  <{a = 0 : i32}>
-test.with_default_valued_properties <{a = 0 : i32}>
+// GENERIC-SAME: <{a = 0 : i32, b = "", c = -1 : i32, unit = false}> : () -> ()
+test.with_default_valued_properties 0 "" -1 unit_absent
+
+// CHECK:   test.with_default_valued_properties 1 "foo" 0 unit{{$}}
+// GENERIC: "test.with_default_valued_properties"()
+// GENERIC-SAME: <{a = 1 : i32, b = "foo", c = 0 : i32, unit}> : () -> ()
+test.with_default_valued_properties 1 "foo" 0 unit
 
 // CHECK:   test.with_optional_properties
-// CHECK-SAME:  <{b = 0 : i32}>
+// CHECK-SAME: simple = 0
+// GENERIC: "test.with_optional_properties"()
+// GENERIC-SAME:  <{hasDefault = [], hasUnit = false, longSyntax = [], maybeUnit = [], nested = [], nonTrivialStorage = [], simple = [0]}> : () -> ()
+test.with_optional_properties simple = 0
+
+// CHECK:   test.with_optional_properties{{$}}
 // GENERIC: "test.with_optional_properties"()
-// GENERIC-SAME:  <{b = 0 : i32}>
-test.with_optional_properties <{b = 0 : i32}>
+// GENERIC-SAME: simple = []
+test.with_optional_properties
 
-// CHECK:   test.with_optional_properties {{$}}
+// CHECK:    test.with_optional_properties
+// CHECK-SAME: anAttr = 0 simple = 1 nonTrivialStorage = "foo" hasDefault = some<0> nested = some<1>  longSyntax = some<"bar"> hasUnit maybeUnit = some<unit>
 // GENERIC: "test.with_optional_properties"()
-// GENERIC-SAME:  : () -> ()
+// GENERIC-SAME: <{anAttr = 0 : i32, hasDefault = [0], hasUnit, longSyntax = ["bar"], maybeUnit = [unit], nested = {{\[}}[1]], nonTrivialStorage = ["foo"], simple = [1]}> : () -> ()
 test.with_optional_properties
+  anAttr = 0
+  simple = 1
+  nonTrivialStorage = "foo"
+  hasDefault = some<0>
+  nested = some<1>
+  longSyntax = some<"bar">
+  hasUnit
+  maybeUnit = some<unit>
+
+// CHECK:    test.with_optional_properties
+// CHECK-SAME: nested = some<none>
+// GENERIC: "test.with_optional_properties"()
+// GENERIC-SAME: nested = {{\[}}[]]
+test.with_optional_properties nested = some<none>
+
+// CHECK:    test.with_array_properties
+// CHECK-SAME: ints = [1, 2] strings = ["a", "b"] nested = {{\[}}[1, 2], [3, 4]] opt = [-1, -2] explicitOptions = [none, 0] explicitUnits = [unit, unit_absent]
+// GENERIC: "test.with_array_properties"()
+test.with_array_properties ints = [1, 2] strings = ["a", "b"] nested = [[1, 2], [3, 4]] opt = [-1, -2] explicitOptions = [none, 0] explicitUnits = [unit, unit_absent] [] thats_has_default
diff --git a/mlir/test/IR/traits.mlir b/mlir/test/IR/traits.mlir
index 1e046706379cd..49cfd7e496746 100644
--- a/mlir/test/IR/traits.mlir
+++ b/mlir/test/IR/traits.mlir
@@ -502,6 +502,25 @@ func.func @succeededOilistTrivial() {
 
 // -----
 
+// CHECK-LABEL: @succeededOilistTrivialProperties
+func.func @succeededOilistTrivialProperties() {
+  // CHECK: test.oilist_with_keywords_only_properties keyword
+  test.oilist_with_keywords_only_properties keyword
+  // CHECK: test.oilist_with_keywords_only_properties otherKeyword
+  test.oilist_with_keywords_only_properties otherKeyword
+  // CHECK: test.oilist_with_keywords_only_properties keyword otherKeyword
+  test.oilist_with_keywords_only_properties keyword otherKeyword
+  // CHECK: test.oilist_with_keywords_only_properties keyword otherKeyword
+  test.oilist_with_keywords_only_properties otherKeyword keyword
+  // CHECK: test.oilist_with_keywords_only_properties thirdKeyword
+  test.oilist_with_keywords_only_properties thirdKeyword
+  // CHECK: test.oilist_with_keywords_only_properties keyword thirdKeyword
+  test.oilist_with_keywords_only_properties keyword thirdKeyword
+  return
+}
+
+// -----
+
 // CHECK-LABEL: @succeededOilistSimple
 func.func @succeededOilistSimple(%arg0 : i32, %arg1 : i32, %arg2 : i32) {
   // CHECK: test.oilist_with_simple_args keyword %{{.*}} : i32
diff --git a/mlir/test/Transforms/test-legalizer.mlir b/mlir/test/Transforms/test-legalizer.mlir
index 65c947198e06e..a52c0e636f0cd 100644
--- a/mlir/test/Transforms/test-legalizer.mlir
+++ b/mlir/test/Transforms/test-legalizer.mlir
@@ -408,10 +408,10 @@ func.func @test_move_op_before_rollback() {
 
 // CHECK-LABEL: func @test_properties_rollback()
 func.func @test_properties_rollback() {
-  // CHECK: test.with_properties <{a = 32 : i64,
+  // CHECK: test.with_properties a = 32,
   // expected-remark @below{{op 'test.with_properties' is not legalizable}}
   test.with_properties
-      <{a = 32 : i64, array = array<i64: 1, 2, 3, 4>, b = "foo"}>
+      a = 32, b = "foo", c = "bar", flag = true, array = [1, 2, 3, 4]
       {modify_inplace}
   "test.return"() : () -> ()
 }
diff --git a/mlir/test/lib/Dialect/Test/TestFormatUtils.cpp b/mlir/test/lib/Dialect/Test/TestFormatUtils.cpp
index 6e75dd3932281..9ed1b3a47be36 100644
--- a/mlir/test/lib/Dialect/Test/TestFormatUtils.cpp
+++ b/mlir/test/lib/Dialect/Test/TestFormatUtils.cpp
@@ -297,11 +297,17 @@ void test::printSwitchCases(OpAsmPrinter &p, Operation *op,
 // CustomUsingPropertyInCustom
 //===----------------------------------------------------------------------===//
 
-bool test::parseUsingPropertyInCustom(OpAsmParser &parser, int64_t value[3]) {
-  return parser.parseLSquare() || parser.parseInteger(value[0]) ||
-         parser.parseComma() || parser.parseInteger(value[1]) ||
-         parser.parseComma() || parser.parseInteger(value[2]) ||
-         parser.parseRSquare();
+bool test::parseUsingPropertyInCustom(OpAsmParser &parser,
+                                      SmallVector<int64_t> &value) {
+  auto elemParser = [&]() {
+    int64_t v = 0;
+    if (failed(parser.parseInteger(v)))
+      return failure();
+    value.push_back(v);
+    return success();
+  };
+  return failed(parser.parseCommaSeparatedList(OpAsmParser::Delimiter::Square,
+                                               elemParser));
 }
 
 void test::printUsingPropertyInCustom(OpAsmPrinter &printer, Operation *op,
diff --git a/mlir/test/lib/Dialect/Test/TestFormatUtils.h b/mlir/test/lib/Dialect/Test/TestFormatUtils.h
index 7e9cd834278e3..6d4df7d82ffa5 100644
--- a/mlir/test/lib/Dialect/Test/TestFormatUtils.h
+++ b/mlir/test/lib/Dialect/Test/TestFormatUtils.h
@@ -160,7 +160,8 @@ void printSwitchCases(mlir::OpAsmPrinter &p, mlir::Operation *op,
 // CustomUsingPropertyInCustom
 //===----------------------------------------------------------------------===//
 
-bool parseUsingPropertyInCustom(mlir::OpAsmParser &parser, int64_t value[3]);
+bool parseUsingPropertyInCustom(mlir::OpAsmParser &parser,
+                                llvm::SmallVector<int64_t> &value);
 
 void printUsingPropertyInCustom(mlir::OpAsmPrinter &printer,
                                 mlir::Operation *op,
diff --git a/mlir/test/lib/Dialect/Test/TestOps.td b/mlir/test/lib/Dialect/Test/TestOps.td
index 9d7e0a7928ab8..3c039c2a7a13a 100644
--- a/mlir/test/lib/Dialect/Test/TestOps.td
+++ b/mlir/test/lib/Dialect/Test/TestOps.td
@@ -2204,7 +2204,7 @@ def ForwardBufferOp : TEST_Op<"forward_buffer", [Pure]> {
 def ReifyBoundOp : TEST_Op<"reify_bound", [Pure]> {
   let description = [{
     Reify a bound for the given index-typed value or dimension size of a shaped
-    value. "LB", "EQ" and "UB" bounds are supported. If `scalable` is set, 
+    value. "LB", "EQ" and "UB" bounds are supported. If `scalable` is set,
     `vscale_min` and `vscale_max` must be provided, which allows computing
     a bound in terms of "vector.vscale" for a given range of vscale.
   }];
@@ -2926,11 +2926,18 @@ def TestVersionedOpC : TEST_Op<"versionedC"> {
 
 // Op with a properties struct defined inline.
 def TestOpWithProperties : TEST_Op<"with_properties"> {
-  let assemblyFormat = "prop-dict attr-dict";
+  let assemblyFormat = [{
+    `a` `=` $a `,`
+    `b` `=` $b `,`
+    `c` `=` $c `,`
+    `flag` `=` $flag `,`
+    `array` `=` $array attr-dict}];
   let arguments = (ins
-    IntProperty<"int64_t">:$a,
+    I64Property:$a,
     StrAttr:$b, // Attributes can directly be used here.
-    ArrayProperty<"int64_t", 4>:$array // example of an array
+    StringProperty:$c,
+    BoolProperty:$flag,
+    IntArrayProperty<"int64_t">:$array // example of an array
   );
 }
 
@@ -2953,7 +2960,7 @@ def TestOpWithPropertiesAndInferredType
 
 // Demonstrate how to wrap an existing C++ class named MyPropStruct.
 def MyStructProperty : Property<"MyPropStruct"> {
-  let convertToAttribute = "$_storage.asAttribute($_ctxt)";
+  let convertToAttribute = "return $_storage.asAttribute($_ctxt);";
   let convertFromAttribute = "return MyPropStruct::setFromAttr($_storage, $_attr, $_diag);";
   let hashProperty = "$_storage.hash();";
 }
@@ -2967,14 +2974,14 @@ def TestOpWithWrappedProperties : TEST_Op<"with_wrapped_properties"> {
 
 def TestOpUsingPropertyInCustom : TEST_Op<"using_property_in_custom"> {
   let assemblyFormat = "custom<UsingPropertyInCustom>($prop) attr-dict";
-  let arguments = (ins ArrayProperty<"int64_t", 3>:$prop);
+  let arguments = (ins IntArrayProperty<"int64_t">:$prop);
 }
 
 def TestOpUsingPropertyInCustomAndOther
   : TEST_Op<"using_property_in_custom_and_other"> {
   let assemblyFormat = "custom<UsingPropertyInCustom>($prop) prop-dict attr-dict";
   let arguments = (ins
-    ArrayProperty<"int64_t", 3>:$prop,
+    IntArrayProperty<"int64_t">:$prop,
     IntProperty<"int64_t">:$other
   );
 }
@@ -3000,7 +3007,7 @@ def TestOpUsingIntPropertyWithWorseBytecode
 
 def PropertiesWithCustomPrint : Property<"PropertiesWithCustomPrint"> {
   let convertToAttribute = [{
-    getPropertiesAsAttribute($_ctxt, $_storage)
+    return getPropertiesAsAttribute($_ctxt, $_storage);
   }];
   let convertFromAttribute = [{
     return setPropertiesFromAttribute($_storage, $_attr, $_diag);
@@ -3064,7 +3071,7 @@ def TestOpWithNiceProperties : TEST_Op<"with_nice_properties"> {
 
 def VersionedProperties : Property<"VersionedProperties"> {
   let convertToAttribute = [{
-      getPropertiesAsAttribute($_ctxt, $_storage)
+    return getPropertiesAsAttribute($_ctxt, $_storage);
   }];
   let convertFromAttribute = [{
     return setPropertiesFromAttribute($_storage, $_attr, $_diag);
@@ -3110,13 +3117,65 @@ def TestOpWithVersionedProperties : TEST_Op<"with_versioned_properties"> {
 }
 
 def TestOpWithDefaultValuedProperties : TEST_Op<"with_default_valued_properties"> {
-  let assemblyFormat = "prop-dict attr-dict";
-  let arguments = (ins DefaultValuedAttr<I32Attr, "0">:$a);
+  let assemblyFormat = [{
+    ($a^) : (`na`)?
+    ($b^)?
+    ($c^)?
+    ($unit^)?
+    attr-dict
+  }];
+  let arguments = (ins DefaultValuedAttr<I32Attr, "0">:$a,
+    DefaultValuedProperty<StringProperty, "\"\"">:$b,
+    DefaultValuedProperty<IntProperty<"int32_t">, "-1">:$c,
+    UnitProperty:$unit);
 }
 
 def TestOpWithOptionalProperties : TEST_Op<"with_optional_properties"> {
-  let assemblyFormat = "prop-dict attr-dict";
-  let arguments = (ins OptionalAttr<I32Attr>:$a, OptionalAttr<I32Attr>:$b);
+  let assemblyFormat = [{
+    (`anAttr` `=` $anAttr^)?
+    (`simple` `=` $simple^)?
+    (`nonTrivialStorage` `=` $nonTrivialStorage^)?
+    (`hasDefault` `=` $hasDefault^)?
+    (`nested` `=` $nested^)?
+    (`longSyntax` `=` $longSyntax^)?
+    (`hasUnit` $hasUnit^)?
+    (`maybeUnit` `=` $maybeUnit^)?
+    attr-dict
+  }];
+  let arguments = (ins
+    OptionalAttr<I32Attr>:$anAttr,
+    OptionalProperty<I64Property>:$simple,
+    OptionalProperty<StringProperty>:$nonTrivialStorage,
+    // Confirm that properties with default values now default to nullopt and have
+    // the long syntax.
+    OptionalProperty<DefaultValuedProperty<I64Property, "0">>:$hasDefault,
+    OptionalProperty<OptionalProperty<I64Property>>:$nested,
+    OptionalProperty<StringProperty, 0>:$longSyntax,
+    UnitProperty:$hasUnit,
+    OptionalProperty<UnitProperty>:$maybeUnit);
+}
+
+def TestOpWithArrayProperties : TEST_Op<"with_array_properties"> {
+  let assemblyFormat = [{
+    `ints` `=` $ints
+    `strings` `=` $strings
+    `nested` `=` $nested
+    `opt` `=` $opt
+    `explicitOptions` `=` $explicitOptions
+    `explicitUnits` `=` $explicitUnits
+    ($hasDefault^ `thats_has_default`)?
+    attr-dict
+  }];
+  let arguments = (ins
+    ArrayProperty<I64Property>:$ints,
+    ArrayProperty<StringProperty>:$strings,
+    ArrayProperty<ArrayProperty<I32Property>>:$nested,
+    OptionalProperty<ArrayProperty<I32Property>>:$opt,
+    ArrayProperty<OptionalProperty<I64Property>>:$explicitOptions,
+    ArrayProperty<UnitProperty>:$explicitUnits,
+    DefaultValuedProperty<ArrayProperty<I64Property>,
+      "::llvm::ArrayRef<int64_t>{}", "::llvm::SmallVector<int64_t>{}">:$hasDefault
+  );
 }
 
 //===----------------------------------------------------------------------===//
diff --git a/mlir/test/lib/Dialect/Test/TestOpsSyntax.td b/mlir/test/lib/Dialect/Test/TestOpsSyntax.td
index 9522a775e247d..98eb7e6a06c0b 100644
--- a/mlir/test/lib/Dialect/Test/TestOpsSyntax.td
+++ b/mlir/test/lib/Dialect/Test/TestOpsSyntax.td
@@ -86,6 +86,17 @@ def OIListTrivial : TEST_Op<"oilist_with_keywords_only"> {
   }];
 }
 
+// Ops related to OIList primitive
+def OIListTrivialProperties : TEST_Op<"oilist_with_keywords_only_properties"> {
+  let arguments = (ins UnitProperty:$keyword, UnitProperty:$otherKeyword,
+                       UnitProperty:$diffNameUnitPropertyKeyword);
+  let assemblyFormat = [{
+    oilist( `keyword` $keyword
+          | `otherKeyword` $otherKeyword
+          | `thirdKeyword` $diffNameUnitPropertyKeyword) attr-dict
+  }];
+}
+
 def OIListSimple : TEST_Op<"oilist_with_simple_args", [AttrSizedOperandSegments]> {
   let arguments = (ins Optional<AnyType>:$arg0,
                        Optional<AnyType>:$arg1,
@@ -392,6 +403,17 @@ def FormatOptionalUnitAttrNoElide
   let assemblyFormat = "($is_optional^)? attr-dict";
 }
 
+def FormatOptionalUnitProperty : TEST_Op<"format_optional_unit_property"> {
+  let arguments = (ins UnitProperty:$is_optional);
+  let assemblyFormat = "(`is_optional` $is_optional^)? attr-dict";
+}
+
+def FormatOptionalUnitPropertyNoElide
+    : TEST_Op<"format_optional_unit_property_no_elide"> {
+  let arguments = (ins UnitProperty:$is_optional);
+  let assemblyFormat = "($is_optional^)? attr-dict";
+}
+
 def FormatOptionalEnumAttr : TEST_Op<"format_optional_enum_attr"> {
   let arguments = (ins OptionalAttr<SomeI64Enum>:$attr);
   let assemblyFormat = "($attr^)? attr-dict";
diff --git a/mlir/test/mlir-tblgen/op-format.mlir b/mlir/test/mlir-tblgen/op-format.mlir
index 46d272649caed..03288ae8bd3d7 100644
--- a/mlir/test/mlir-tblgen/op-format.mlir
+++ b/mlir/test/mlir-tblgen/op-format.mlir
@@ -195,6 +195,16 @@ test.format_optional_unit_attribute
 // CHECK: test.format_optional_unit_attribute_no_elide unit
 test.format_optional_unit_attribute_no_elide unit
 
+// CHECK: test.format_optional_unit_property is_optional
+test.format_optional_unit_property is_optional
+
+// CHECK: test.format_optional_unit_property
+// CHECK-NOT: is_optional
+test.format_optional_unit_property
+
+// CHECK: test.format_optional_unit_property_no_elide unit
+test.format_optional_unit_property_no_elide unit
+
 // CHECK: test.format_optional_enum_attr case5
 test.format_optional_enum_attr case5
 
diff --git a/mlir/test/mlir-tblgen/op-format.td b/mlir/test/mlir-tblgen/op-format.td
index 4a19ffb3dfcc6..8af4341952f04 100644
--- a/mlir/test/mlir-tblgen/op-format.td
+++ b/mlir/test/mlir-tblgen/op-format.td
@@ -73,7 +73,7 @@ def OptionalGroupA : TestFormat_Op<[{
 // CHECK-NEXT: result.addAttribute("a", parser.getBuilder().getUnitAttr())
 // CHECK: parser.parseKeyword("bar")
 // CHECK-LABEL: OptionalGroupB::print
-// CHECK: if (!getAAttr())
+// CHECK: if (!(getAAttr() && getAAttr() != ((false) ? ::mlir::OpBuilder((*this)->getContext()).getUnitAttr() : nullptr)))
 // CHECK-NEXT: odsPrinter << ' ' << "foo"
 // CHECK-NEXT: else
 // CHECK-NEXT: odsPrinter << ' ' << "bar"
@@ -84,7 +84,7 @@ def OptionalGroupB : TestFormat_Op<[{
 // Optional group anchored on a default-valued attribute:
 // CHECK-LABEL: OptionalGroupC::parse
 
-//       CHECK: if (getAAttr() && getAAttr() != ::mlir::OpBuilder((*this)->getContext()).getStringAttr("default")) {
+//       CHECK: if (getAAttr() != ::mlir::OpBuilder((*this)->getContext()).getStringAttr("default")) {
 //  CHECK-NEXT:   odsPrinter << ' ';
 //  CHECK-NEXT:   odsPrinter.printAttributeWithoutType(getAAttr());
 //  CHECK-NEXT: }
diff --git a/mlir/test/mlir-tblgen/op-properties.td b/mlir/test/mlir-tblgen/op-properties.td
index 7b0ee6b2a1bd8..918583c9f4ed4 100644
--- a/mlir/test/mlir-tblgen/op-properties.td
+++ b/mlir/test/mlir-tblgen/op-properties.td
@@ -1,8 +1,10 @@
-// RUN: mlir-tblgen -gen-op-decls -I %S/../../include %s | FileCheck %s
+// RUN: mlir-tblgen -gen-op-decls -I %S/../../include %s | FileCheck %s --check-prefix=DECL
+// RUN: mlir-tblgen -gen-op-defs -I %S/../../include %s | FileCheck %s --check-prefix=DEFS
 
 include "mlir/IR/AttrTypeBase.td"
 include "mlir/IR/EnumAttr.td"
 include "mlir/IR/OpBase.td"
+include "mlir/IR/Properties.td"
 
 def Test_Dialect : Dialect {
   let name = "test";
@@ -15,7 +17,115 @@ def OpWithAttr : NS_Op<"op_with_attr">{
   let arguments = (ins AnyAttr:$attr, OptionalAttr<AnyAttr>:$optional);
 }
 
-// CHECK: void setAttrAttr(::mlir::Attribute attr)
-// CHECK-NEXT: getProperties().attr = attr
-// CHECK: void setOptionalAttr(::mlir::Attribute attr)
-// CHECK-NEXT: getProperties().optional = attr
+// Test required and optional properties
+// ---
+
+def DefaultI64Array : IntArrayProperty<"int64_t"> {
+  let defaultValue = "::llvm::ArrayRef<int64_t>{}";
+  let storageTypeValueOverride = "::llvm::SmallVector<int64_t>{}";
+}
+
+def OpWithProps : NS_Op<"op_with_props"> {
+  let arguments = (ins
+    BoolProperty:$flag,
+    StringProperty:$string,
+    ArrayProperty<StringProperty>:$strings,
+    DefaultValuedProperty<I32Property, "0">:$default_int,
+    OptionalProperty<I64Property>:$optional,
+    DefaultI64Array:$intArray
+  );
+}
+
+/// Check that optional arguments to builders only go at the end.
+def OpWithSomeOptionalProperties : NS_Op<"op_with_some_optional_props"> {
+  let arguments = (ins
+    OptionalProperty<I64Property>:$mustSpecify,
+    I64Property:$required,
+    OptionalProperty<StringProperty>:$canOmit,
+    DefaultValuedProperty<I64Property, "-1">:$canOmit2
+  );
+}
+
+/// Check that the ambiguous attribute protection correctly stops optional properties
+/// from getting default argument values in builders.
+def OpWithOptionalPropsAndAttrs :
+    NS_Op<"with_some_optional_props_and_atts"> {
+  let arguments = (ins
+    OptionalProperty<BoolProperty>:$mustSpecify,
+    OptionalAttr<BoolAttr>:$ambiguous,
+    OptionalAttr<I32Attr>:$canOmit,
+    OptionalProperty<I32Property>:$canOmitProp
+  );
+}
+
+// DECL: void setAttrAttr(::mlir::Attribute attr)
+// DECL-NEXT: getProperties().attr = attr
+// DECL: void setOptionalAttr(::mlir::Attribute attr)
+// DECL-NEXT: getProperties().optional = attr
+
+// -----
+
+// DECL-LABEL: class OpWithOptionalPropsAndAttrs :
+// DECL: static void build(
+// DECL-SAME: ::mlir::OpBuilder &odsBuilder,
+// DECL-SAME: ::mlir::OperationState &odsState,
+// DECL-SAME: /*optional*/std::optional<bool> mustSpecify,
+// DECL-SAME: /*optional*/::mlir::BoolAttr ambiguous,
+// DECL-SAME: /*optional*/::mlir::IntegerAttr canOmit,
+// DECL-SAME: /*optional*/std::optional<int32_t> canOmitProp = std::nullopt);
+
+// -----
+
+// COM: Ensure the struct is set up how we expect
+// DECL-LABEL: class OpWithPropsGenericAdaptorBase
+// DECL: using flagTy = bool;
+// DECL-NEXT: flagTy flag;
+// DECL-NEXT: bool getFlag()
+// DECL-NEXT: propStorage = this->flag
+// DECL-NEXT: return propStorage;
+// DECL: void setFlag(bool propValue)
+// DECL-NEXT: propStorage = this->flag;
+// DECL-NEXT: propStorage = propValue;
+// DECL: using stringTy = std::string;
+// DECL: llvm::StringRef getString()
+// DECL: auto &propStorage = this->string;
+// DECL-NEXT: return ::llvm::StringRef{propStorage};
+// DECL: using stringsTy = ::llvm::SmallVector<std::string>
+// DECL: ::llvm::ArrayRef<std::string> getStrings()
+// DECL: using default_intTy = int32_t;
+// DECL: default_intTy default_int = 0;
+// DECL: intArrayTy intArray = ::llvm::SmallVector<int64_t>{};
+// DECL: ::llvm::ArrayRef<int64_t> getIntArray()
+// DECL: return ::llvm::ArrayRef<int64_t>{propStorage}
+// DECL: void setIntArray(::llvm::ArrayRef<int64_t> propValue)
+// DECL: propStorage.assign
+// DECL-LABEL: class OpWithProps :
+// DECL: setString(::llvm::StringRef newString)
+// DECL-NEXT: getProperties().setString(newString)
+
+// DECL: static void build(
+// DECL-SAME: ::mlir::OpBuilder &odsBuilder,
+// DECL-SAME: ::mlir::OperationState &odsState,
+// DECL-SAME: bool flag,
+// DECL-SAME: ::llvm::StringRef string,
+// DECL-SAME: ::llvm::ArrayRef<std::string> strings,
+// DECL-SAME: /*optional*/int32_t default_int = 0,
+// DECL-SAME: /*optional*/std::optional<int64_t> optional = std::nullopt,
+// DECL-SAME: /*optional*/::llvm::ArrayRef<int64_t> intArray = ::llvm::ArrayRef<int64_t>{});
+
+// DEFS-LABEL: OpWithProps::computePropertiesHash
+// DEFS: hash_intArray
+// DEFS-NEXT: return ::llvm::hash_value(::llvm::ArrayRef<int64_t>{propStorage})
+// DEFS: ::llvm::hash_value(prop.optional)
+// DEFS: hash_intArray(prop.intArray)
+
+// -----
+
+// DECL-LABEL: class OpWithSomeOptionalProperties :
+// DECL: static void build(
+// DECL-SAME: ::mlir::OpBuilder &odsBuilder,
+// DECL-SAME: ::mlir::OperationState &odsState,
+// DECL-SAME: /*optional*/std::optional<int64_t> mustSpecify,
+// DECL-SAME: int64_t required,
+// DECL-SAME: /*optional*/std::optional<::llvm::StringRef> canOmit = std::nullopt,
+// DECL-SAME: /*optional*/int64_t canOmit2 = -1);
diff --git a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
index adda7ce6fc6c9..1a0c6c7d1692a 100644
--- a/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp
@@ -155,6 +155,36 @@ static const char *const valueRangeReturnCode = R"(
            std::next({0}, valueRange.first + valueRange.second)};
 )";
 
+/// Parse operand/result segment_size property.
+/// {0}: Number of elements in the segment array
+static const char *const parseTextualSegmentSizeFormat = R"(
+  size_t i = 0;
+  auto parseElem = [&]() -> ::mlir::ParseResult {
+    if (i >= {0})
+      return $_parser.emitError($_parser.getCurrentLocation(),
+        "expected `]` after {0} segment sizes");
+    if (failed($_parser.parseInteger($_storage[i])))
+      return ::mlir::failure();
+    i += 1;
+    return ::mlir::success();
+  };
+  if (failed($_parser.parseCommaSeparatedList(
+      ::mlir::AsmParser::Delimeter::Square, parseElem)))
+    return failure();
+  if (i < {0})
+    return $_parser.emitError($_parser.getCurrentLocation(),
+      "expected {0} segment sizes, found only ") << i;
+  return success();
+)";
+
+static const char *const printTextualSegmentSize = R"(
+  [&]() {
+    $_printer << '[';
+    ::llvm::interleaveComma($_storage, $_printer);
+    $_printer << ']';
+  }()
+)";
+
 /// Read operand/result segment_size from bytecode.
 static const char *const readBytecodeSegmentSizeNative = R"(
   if ($_reader.getBytecodeVersion() >= /*kNativePropertiesODSSegmentSize=*/6)
@@ -422,8 +452,10 @@ class OpOrAdaptorHelper {
   // Property
   std::optional<NamedProperty> operandSegmentsSize;
   std::string operandSegmentsSizeStorage;
+  std::string operandSegmentsSizeParser;
   std::optional<NamedProperty> resultSegmentsSize;
   std::string resultSegmentsSizeStorage;
+  std::string resultSegmentsSizeParser;
 
   // Indices to store the position in the emission order of the operand/result
   // segment sizes attribute if emitted as part of the properties for legacy
@@ -448,31 +480,40 @@ void OpOrAdaptorHelper::computeAttrMetadata() {
         {namedAttr.name, AttributeMetadata{namedAttr.name, !isOptional, attr}});
   }
 
-  auto makeProperty = [&](StringRef storageType) {
+  auto makeProperty = [&](StringRef storageType, StringRef parserCall) {
     return Property(
+        /*summary=*/"",
+        /*description=*/"",
         /*storageType=*/storageType,
         /*interfaceType=*/"::llvm::ArrayRef<int32_t>",
         /*convertFromStorageCall=*/"$_storage",
         /*assignToStorageCall=*/
         "::llvm::copy($_value, $_storage.begin())",
         /*convertToAttributeCall=*/
-        "::mlir::DenseI32ArrayAttr::get($_ctxt, $_storage)",
+        "return ::mlir::DenseI32ArrayAttr::get($_ctxt, $_storage);",
         /*convertFromAttributeCall=*/
         "return convertFromAttribute($_storage, $_attr, $_diag);",
+        /*parserCall=*/parserCall,
+        /*optionalParserCall=*/"",
+        /*printerCall=*/printTextualSegmentSize,
         /*readFromMlirBytecodeCall=*/readBytecodeSegmentSizeNative,
         /*writeToMlirBytecodeCall=*/writeBytecodeSegmentSizeNative,
         /*hashPropertyCall=*/
         "::llvm::hash_combine_range(std::begin($_storage), "
         "std::end($_storage));",
-        /*StringRef defaultValue=*/"");
+        /*StringRef defaultValue=*/"",
+        /*storageTypeValueOverride=*/"");
   };
   // Include key attributes from several traits as implicitly registered.
   if (op.getTrait("::mlir::OpTrait::AttrSizedOperandSegments")) {
     if (op.getDialect().usePropertiesForAttributes()) {
       operandSegmentsSizeStorage =
           llvm::formatv("std::array<int32_t, {0}>", op.getNumOperands());
-      operandSegmentsSize = {"operandSegmentSizes",
-                             makeProperty(operandSegmentsSizeStorage)};
+      operandSegmentsSizeParser =
+          llvm::formatv(parseTextualSegmentSizeFormat, op.getNumOperands());
+      operandSegmentsSize = {
+          "operandSegmentSizes",
+          makeProperty(operandSegmentsSizeStorage, operandSegmentsSizeParser)};
     } else {
       attrMetadata.insert(
           {operandSegmentAttrName, AttributeMetadata{operandSegmentAttrName,
@@ -484,8 +525,11 @@ void OpOrAdaptorHelper::computeAttrMetadata() {
     if (op.getDialect().usePropertiesForAttributes()) {
       resultSegmentsSizeStorage =
           llvm::formatv("std::array<int32_t, {0}>", op.getNumResults());
-      resultSegmentsSize = {"resultSegmentSizes",
-                            makeProperty(resultSegmentsSizeStorage)};
+      resultSegmentsSizeParser =
+          llvm::formatv(parseTextualSegmentSizeFormat, op.getNumResults());
+      resultSegmentsSize = {
+          "resultSegmentSizes",
+          makeProperty(resultSegmentsSizeStorage, resultSegmentsSizeParser)};
     } else {
       attrMetadata.insert(
           {resultSegmentAttrName,
@@ -572,6 +616,12 @@ class OpEmitter {
   void
   genPropertiesSupportForBytecode(ArrayRef<ConstArgument> attrOrProperties);
 
+  // Generates getters for the properties.
+  void genPropGetters();
+
+  // Generates seters for the properties.
+  void genPropSetters();
+
   // Generates getters for the attributes.
   void genAttrGetters();
 
@@ -1041,6 +1091,8 @@ OpEmitter::OpEmitter(const Operator &op,
   genNamedRegionGetters();
   genNamedSuccessorGetters();
   genPropertiesSupport();
+  genPropGetters();
+  genPropSetters();
   genAttrGetters();
   genAttrSetters();
   genOptionalAttrRemovers();
@@ -1198,6 +1250,16 @@ void OpEmitter::genAttrNameGetters() {
   }
 }
 
+// Emit the getter for a named property.
+// It is templated to be shared between the Op and the adaptor class.
+template <typename OpClassOrAdaptor>
+static void emitPropGetter(OpClassOrAdaptor &opClass, const Operator &op,
+                           StringRef name, const Property &prop) {
+  auto *method = opClass.addInlineMethod(prop.getInterfaceType(), name);
+  ERROR_IF_PRUNED(method, name, op);
+  method->body() << formatv("  return getProperties().{0}();", name);
+}
+
 // Emit the getter for an attribute with the return type specified.
 // It is templated to be shared between the Op and the adaptor class.
 template <typename OpClassOrAdaptor>
@@ -1313,7 +1375,7 @@ void OpEmitter::genPropertiesSupport() {
     )decl";
   const char *propFromAttrFmt = R"decl(
       auto setFromAttr = [] (auto &propStorage, ::mlir::Attribute propAttr,
-               ::llvm::function_ref<::mlir::InFlightDiagnostic()> emitError) {{
+               ::llvm::function_ref<::mlir::InFlightDiagnostic()> emitError) -> ::mlir::LogicalResult {{
         {0}
       };
       {2};
@@ -1358,7 +1420,10 @@ void OpEmitter::genPropertiesSupport() {
                                           .addSubst("_storage", propertyStorage)
                                           .addSubst("_diag", propertyDiag)),
                                name, getAttr);
-      if (prop.hasDefaultValue()) {
+      if (prop.hasStorageTypeValueOverride()) {
+        setPropMethod << formatv(attrGetDefaultFmt, name,
+                                 prop.getStorageTypeValueOverride());
+      } else if (prop.hasDefaultValue()) {
         setPropMethod << formatv(attrGetDefaultFmt, name,
                                  prop.getDefaultValue());
       } else {
@@ -1409,8 +1474,10 @@ void OpEmitter::genPropertiesSupport() {
   const char *propToAttrFmt = R"decl(
     {
       const auto &propStorage = prop.{0};
-      attrs.push_back(odsBuilder.getNamedAttr("{0}",
-                                              {1}));
+      auto attr = [&]() -> ::mlir::Attribute {{
+        {1}
+      }();
+      attrs.push_back(odsBuilder.getNamedAttr("{0}", attr));
     }
 )decl";
   for (const auto &attrOrProp : attrOrProperties) {
@@ -1458,9 +1525,12 @@ void OpEmitter::genPropertiesSupport() {
       StringRef name = namedProperty->name;
       auto &prop = namedProperty->prop;
       FmtContext fctx;
-      hashMethod << formatv(propHashFmt, name,
-                            tgfmt(prop.getHashPropertyCall(),
-                                  &fctx.addSubst("_storage", propertyStorage)));
+      if (!prop.getHashPropertyCall().empty()) {
+        hashMethod << formatv(
+            propHashFmt, name,
+            tgfmt(prop.getHashPropertyCall(),
+                  &fctx.addSubst("_storage", propertyStorage)));
+      }
     }
   }
   hashMethod << "  return llvm::hash_combine(";
@@ -1468,8 +1538,13 @@ void OpEmitter::genPropertiesSupport() {
       attrOrProperties, hashMethod, [&](const ConstArgument &attrOrProp) {
         if (const auto *namedProperty =
                 llvm::dyn_cast_if_present<const NamedProperty *>(attrOrProp)) {
-          hashMethod << "\n    hash_" << namedProperty->name << "(prop."
-                     << namedProperty->name << ")";
+          if (!namedProperty->prop.getHashPropertyCall().empty()) {
+            hashMethod << "\n    hash_" << namedProperty->name << "(prop."
+                       << namedProperty->name << ")";
+          } else {
+            hashMethod << "\n    ::llvm::hash_value(prop."
+                       << namedProperty->name << ")";
+          }
           return;
         }
         const auto *namedAttr =
@@ -1524,8 +1599,9 @@ void OpEmitter::genPropertiesSupport() {
                      "\"{0}\") return ",
                      resultSegmentAttrName);
     }
-    getInherentAttrMethod << tgfmt(prop.getConvertToAttributeCall(), &fctx)
-                          << ";\n";
+    getInherentAttrMethod << "[&]() -> ::mlir::Attribute { "
+                          << tgfmt(prop.getConvertToAttributeCall(), &fctx)
+                          << " }();\n";
 
     if (name == operandSegmentAttrName) {
       setInherentAttrMethod
@@ -1549,13 +1625,15 @@ void OpEmitter::genPropertiesSupport() {
 )decl",
                                      name);
     if (name == operandSegmentAttrName) {
-      populateInherentAttrsMethod
-          << formatv("  attrs.append(\"{0}\", {1});\n", operandSegmentAttrName,
-                     tgfmt(prop.getConvertToAttributeCall(), &fctx));
+      populateInherentAttrsMethod << formatv(
+          "  attrs.append(\"{0}\", [&]() -> ::mlir::Attribute { {1} }());\n",
+          operandSegmentAttrName,
+          tgfmt(prop.getConvertToAttributeCall(), &fctx));
     } else {
-      populateInherentAttrsMethod
-          << formatv("  attrs.append(\"{0}\", {1});\n", resultSegmentAttrName,
-                     tgfmt(prop.getConvertToAttributeCall(), &fctx));
+      populateInherentAttrsMethod << formatv(
+          "  attrs.append(\"{0}\", [&]() -> ::mlir::Attribute { {1} }());\n",
+          resultSegmentAttrName,
+          tgfmt(prop.getConvertToAttributeCall(), &fctx));
     }
   }
   getInherentAttrMethod << "  return std::nullopt;\n";
@@ -1701,6 +1779,26 @@ void OpEmitter::genPropertiesSupportForBytecode(
   readPropertiesMethod << "  return ::mlir::success();";
 }
 
+void OpEmitter::genPropGetters() {
+  for (const NamedProperty &prop : op.getProperties()) {
+    std::string name = op.getGetterName(prop.name);
+    emitPropGetter(opClass, op, name, prop.prop);
+  }
+}
+
+void OpEmitter::genPropSetters() {
+  for (const NamedProperty &prop : op.getProperties()) {
+    std::string name = op.getSetterName(prop.name);
+    std::string argName = "new" + convertToCamelFromSnakeCase(
+                                      prop.name, /*capitalizeFirst=*/true);
+    auto *method = opClass.addInlineMethod(
+        "void", name, MethodParameter(prop.prop.getInterfaceType(), argName));
+    if (!method)
+      return;
+    method->body() << formatv("  getProperties().{0}({1});", name, argName);
+  }
+}
+
 void OpEmitter::genAttrGetters() {
   FmtContext fctx;
   fctx.withBuilder("::mlir::Builder((*this)->getContext())");
@@ -2957,6 +3055,12 @@ void OpEmitter::buildParamList(SmallVectorImpl<MethodParameter> &paramList,
   }
 
   // Add parameters for all arguments (operands and attributes).
+  // Track "attr-like" (property and attribute) optional values separate from
+  // attributes themselves so that the disambiguation code can look at the first
+  // attribute specifically when determining where to trim the optional-value
+  // list to avoid ambiguity while preserving the ability of all-property ops to
+  // use default parameters.
+  int defaultValuedAttrLikeStartIndex = op.getNumArgs();
   int defaultValuedAttrStartIndex = op.getNumArgs();
   // Successors and variadic regions go at the end of the parameter list, so no
   // default arguments are possible.
@@ -2967,6 +3071,15 @@ void OpEmitter::buildParamList(SmallVectorImpl<MethodParameter> &paramList,
     for (int i = op.getNumArgs() - 1; i >= 0; --i) {
       auto *namedAttr =
           llvm::dyn_cast_if_present<tblgen::NamedAttribute *>(op.getArg(i));
+      auto *namedProperty =
+          llvm::dyn_cast_if_present<tblgen::NamedProperty *>(op.getArg(i));
+      if (namedProperty) {
+        Property prop = namedProperty->prop;
+        if (!prop.hasDefaultValue())
+          break;
+        defaultValuedAttrLikeStartIndex = i;
+        continue;
+      }
       if (!namedAttr)
         break;
 
@@ -2986,6 +3099,7 @@ void OpEmitter::buildParamList(SmallVectorImpl<MethodParameter> &paramList,
       if (retType == "::llvm::APInt" || retType == "::llvm::APFloat")
         break;
 
+      defaultValuedAttrLikeStartIndex = i;
       defaultValuedAttrStartIndex = i;
     }
   }
@@ -3001,8 +3115,10 @@ void OpEmitter::buildParamList(SmallVectorImpl<MethodParameter> &paramList,
     if ((attrParamKind == AttrParamKind::WrappedAttr &&
          canUseUnwrappedRawValue(attr)) ||
         (attrParamKind == AttrParamKind::UnwrappedValue &&
-         !canUseUnwrappedRawValue(attr)))
+         !canUseUnwrappedRawValue(attr))) {
       ++defaultValuedAttrStartIndex;
+      defaultValuedAttrLikeStartIndex = defaultValuedAttrStartIndex;
+    }
   }
 
   /// Collect any inferred attributes.
@@ -3029,8 +3145,16 @@ void OpEmitter::buildParamList(SmallVectorImpl<MethodParameter> &paramList,
                              operand->isOptional());
       continue;
     }
-    if (llvm::isa_and_present<NamedProperty *>(arg)) {
-      // TODO
+    if (auto *propArg = llvm::dyn_cast_if_present<NamedProperty *>(arg)) {
+      const Property &prop = propArg->prop;
+      StringRef type = prop.getInterfaceType();
+      std::string defaultValue;
+      if (prop.hasDefaultValue() && i >= defaultValuedAttrLikeStartIndex) {
+        defaultValue = prop.getDefaultValue();
+      }
+      bool isOptional = prop.hasDefaultValue();
+      paramList.emplace_back(type, propArg->name, StringRef(defaultValue),
+                             isOptional);
       continue;
     }
     const NamedAttribute &namedAttr = *arg.get<NamedAttribute *>();
@@ -3157,6 +3281,15 @@ void OpEmitter::genCodeForAddingArgAndRegionForBuilder(
     }
   }
 
+  // Push all properties to the result.
+  for (const auto &namedProp : op.getProperties()) {
+    // Use the setter from the Properties struct since the conversion from the
+    // interface type (used in the builder argument) to the storage type (used
+    // in the state) is not necessarily trivial.
+    std::string setterName = op.getSetterName(namedProp.name);
+    body << formatv("  {0}.getOrAddProperties<Properties>().{1}({2});\n",
+                    builderOpState, setterName, namedProp.name);
+  }
   // Push all attributes to the result.
   for (const auto &namedAttr : op.getAttributes()) {
     auto &attr = namedAttr.attr;
@@ -3990,17 +4123,19 @@ OpOperandAdaptorEmitter::OpOperandAdaptorEmitter(
         // Generate the data member using the storage type.
         os << "    using " << name << "Ty = " << prop.getStorageType() << ";\n"
            << "    " << name << "Ty " << name;
-        if (prop.hasDefaultValue())
+        if (prop.hasStorageTypeValueOverride())
+          os << " = " << prop.getStorageTypeValueOverride();
+        else if (prop.hasDefaultValue())
           os << " = " << prop.getDefaultValue();
         comparatorOs << "        rhs." << name << " == this->" << name
                      << " &&\n";
         // Emit accessors using the interface type.
         const char *accessorFmt = R"decl(;
-    {0} get{1}() {
+    {0} get{1}() const {
       auto &propStorage = this->{2};
       return {3};
     }
-    void set{1}(const {0} &propValue) {
+    void set{1}({0} propValue) {
       auto &propStorage = this->{2};
       {4};
     }
@@ -4268,6 +4403,11 @@ OpOperandAdaptorEmitter::OpOperandAdaptorEmitter(
     ERROR_IF_PRUNED(m, "Adaptor::getAttributes", op);
     m->body() << "  return odsAttrs;";
   }
+  for (auto &namedProp : op.getProperties()) {
+    std::string name = op.getGetterName(namedProp.name);
+    emitPropGetter(genericAdaptorBase, op, name, namedProp.prop);
+  }
+
   for (auto &namedAttr : op.getAttributes()) {
     const auto &name = namedAttr.name;
     const auto &attr = namedAttr.attr;
diff --git a/mlir/tools/mlir-tblgen/OpFormatGen.cpp b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
index f7cc0a292b8c5..e6f2153f1f8af 100644
--- a/mlir/tools/mlir-tblgen/OpFormatGen.cpp
+++ b/mlir/tools/mlir-tblgen/OpFormatGen.cpp
@@ -45,7 +45,7 @@ class OpVariableElement : public VariableElementBase<VariableKind> {
   OpVariableElement(const VarT *var) : var(var) {}
 
   /// Get the variable.
-  const VarT *getVar() { return var; }
+  const VarT *getVar() const { return var; }
 
 protected:
   /// The op variable, e.g. a type or attribute constraint.
@@ -64,11 +64,6 @@ struct AttributeVariable
     return attrType ? attrType->getBuilderCall() : std::nullopt;
   }
 
-  /// Return if this attribute refers to a UnitAttr.
-  bool isUnitAttr() const {
-    return var->attr.getBaseAttr().getAttrDefName() == "UnitAttr";
-  }
-
   /// Indicate if this attribute is printed "qualified" (that is it is
   /// prefixed with the `#dialect.mnemonic`).
   bool shouldBeQualified() { return shouldBeQualifiedFlag; }
@@ -98,6 +93,42 @@ using SuccessorVariable =
 /// This class represents a variable that refers to a property argument.
 using PropertyVariable =
     OpVariableElement<NamedProperty, VariableElement::Property>;
+
+/// LLVM RTTI helper for attribute-like variables, that is, attributes or
+/// properties. This allows for common handling of attributes and properties in
+/// parts of the code that are oblivious to whether something is stored as an
+/// attribute or a property.
+struct AttributeLikeVariable : public VariableElement {
+  enum { AttributeLike = 1 << 0 };
+
+  static bool classof(const VariableElement *ve) {
+    return ve->getKind() == VariableElement::Attribute ||
+           ve->getKind() == VariableElement::Property;
+  }
+
+  static bool classof(const FormatElement *fe) {
+    return isa<VariableElement>(fe) && classof(cast<VariableElement>(fe));
+  }
+
+  /// Returns true if the variable is a UnitAttr or a UnitProperty.
+  bool isUnit() const {
+    if (const auto *attr = dyn_cast<AttributeVariable>(this))
+      return attr->getVar()->attr.getBaseAttr().getAttrDefName() == "UnitAttr";
+    if (const auto *prop = dyn_cast<PropertyVariable>(this)) {
+      return prop->getVar()->prop.getBaseProperty().getPropertyDefName() ==
+             "UnitProperty";
+    }
+    llvm_unreachable("Type that wasn't listed in classof()");
+  }
+
+  StringRef getName() const {
+    if (const auto *attr = dyn_cast<AttributeVariable>(this))
+      return attr->getVar()->name;
+    if (const auto *prop = dyn_cast<PropertyVariable>(this))
+      return prop->getVar()->name;
+    llvm_unreachable("Type that wasn't listed in classof()");
+  }
+};
 } // namespace
 
 //===----------------------------------------------------------------------===//
@@ -214,11 +245,11 @@ class OIListElement : public DirectiveElementBase<DirectiveElement::OIList> {
 
   /// If the parsing element is a single UnitAttr element, then it returns the
   /// attribute variable. Otherwise, returns nullptr.
-  AttributeVariable *
-  getUnitAttrParsingElement(ArrayRef<FormatElement *> pelement) {
+  AttributeLikeVariable *
+  getUnitVariableParsingElement(ArrayRef<FormatElement *> pelement) {
     if (pelement.size() == 1) {
-      auto *attrElem = dyn_cast<AttributeVariable>(pelement[0]);
-      if (attrElem && attrElem->isUnitAttr())
+      auto *attrElem = dyn_cast<AttributeLikeVariable>(pelement[0]);
+      if (attrElem && attrElem->isUnit())
         return attrElem;
     }
     return nullptr;
@@ -488,6 +519,36 @@ const char *const enumAttrParserCode = R"(
   }
 )";
 
+/// The code snippet used to generate a parser call for a property.
+/// {0}: The name of the property
+/// {1}: The C++ class name of the operation
+/// {2}: The property's parser code with appropriate substitutions performed
+/// {3}: The description of the expected property for the error message.
+const char *const propertyParserCode = R"(
+  auto {0}PropLoc = parser.getCurrentLocation();
+  auto {0}PropParseResult = [&](auto& propStorage) -> ::mlir::ParseResult {{
+    {2}
+    return ::mlir::success();
+  }(result.getOrAddProperties<{1}::Properties>().{0});
+  if (failed({0}PropParseResult)) {{
+    return parser.emitError({0}PropLoc, "invalid value for property {0}, expected {3}");
+  }
+)";
+
+/// The code snippet used to generate a parser call for a property.
+/// {0}: The name of the property
+/// {1}: The C++ class name of the operation
+/// {2}: The property's parser code with appropriate substitutions performed
+const char *const optionalPropertyParserCode = R"(
+  auto {0}PropParseResult = [&](auto& propStorage) -> ::mlir::OptionalParseResult {{
+    {2}
+    return ::mlir::success();
+  }(result.getOrAddProperties<{1}::Properties>().{0});
+  if ({0}PropParseResult.has_value() && failed(*{0}PropParseResult)) {{
+    return ::mlir::failure();
+  }
+)";
+
 /// The code snippet used to generate a parser call for an operand.
 ///
 /// {0}: The name of the operand.
@@ -796,9 +857,9 @@ static void genElementParserStorage(FormatElement *element, const Operator &op,
 
     // If the anchor is a unit attribute, it won't be parsed directly so elide
     // it.
-    auto *anchor = dyn_cast<AttributeVariable>(optional->getAnchor());
+    auto *anchor = dyn_cast<AttributeLikeVariable>(optional->getAnchor());
     FormatElement *elidedAnchorElement = nullptr;
-    if (anchor && anchor != elements.front() && anchor->isUnitAttr())
+    if (anchor && anchor != elements.front() && anchor->isUnit())
       elidedAnchorElement = anchor;
     for (FormatElement *childElement : elements)
       if (childElement != elidedAnchorElement)
@@ -808,7 +869,7 @@ static void genElementParserStorage(FormatElement *element, const Operator &op,
 
   } else if (auto *oilist = dyn_cast<OIListElement>(element)) {
     for (ArrayRef<FormatElement *> pelement : oilist->getParsingElements()) {
-      if (!oilist->getUnitAttrParsingElement(pelement))
+      if (!oilist->getUnitVariableParsingElement(pelement))
         for (FormatElement *element : pelement)
           genElementParserStorage(element, op, body);
     }
@@ -1049,7 +1110,6 @@ static void genCustomDirectiveParser(CustomDirective *dir, MethodBody &body,
         body << llvm::formatv("    result.addAttribute(\"{0}\", {0}Attr);\n",
                               var->name);
       }
-
     } else if (auto *operand = dyn_cast<OperandVariable>(param)) {
       const NamedTypeConstraint *var = operand->getVar();
       if (var->isOptional()) {
@@ -1137,6 +1197,29 @@ static void genEnumAttrParser(const NamedAttribute *var, MethodBody &body,
                   validCaseKeywordsStr, errorMessage, attrAssignment);
 }
 
+// Generate the parser for a property.
+static void genPropertyParser(PropertyVariable *propVar, MethodBody &body,
+                              StringRef opCppClassName,
+                              bool requireParse = true) {
+  StringRef name = propVar->getVar()->name;
+  const Property &prop = propVar->getVar()->prop;
+  bool parseOptionally =
+      prop.hasDefaultValue() && !requireParse && prop.hasOptionalParser();
+  FmtContext fmtContext;
+  fmtContext.addSubst("_parser", "parser");
+  fmtContext.addSubst("_ctxt", "parser.getContext()");
+  fmtContext.addSubst("_storage", "propStorage");
+
+  if (parseOptionally) {
+    body << formatv(optionalPropertyParserCode, name, opCppClassName,
+                    tgfmt(prop.getOptionalParserCall(), &fmtContext));
+  } else {
+    body << formatv(propertyParserCode, name, opCppClassName,
+                    tgfmt(prop.getParserCall(), &fmtContext),
+                    prop.getSummary());
+  }
+}
+
 // Generate the parser for an attribute.
 static void genAttrParser(AttributeVariable *attr, MethodBody &body,
                           FmtContext &attrTypeCtx, bool parseAsOptional,
@@ -1213,14 +1296,16 @@ if (!dict) {
 }
 )decl";
 
-  // TODO: properties might be optional as well.
+  // {0}: fromAttribute call
+  // {1}: property name
+  // {2}: isRequired
   const char *propFromAttrFmt = R"decl(
 auto setFromAttr = [] (auto &propStorage, ::mlir::Attribute propAttr,
-         ::llvm::function_ref<::mlir::InFlightDiagnostic()> emitError) {{
+         ::llvm::function_ref<::mlir::InFlightDiagnostic()> emitError) -> ::mlir::LogicalResult {{
   {0};
 };
 auto attr = dict.get("{1}");
-if (!attr) {{
+if (!attr && {2}) {{
   emitError() << "expected key entry for {1} in DictionaryAttr to set "
              "Properties.";
   return ::mlir::failure();
@@ -1238,13 +1323,14 @@ if (::mlir::failed(setFromAttr(prop.{1}, attr, emitError)))
 
     StringRef name = namedProperty.name;
     const Property &prop = namedProperty.prop;
+    bool isRequired = !prop.hasDefaultValue();
     FmtContext fctx;
     body << formatv(propFromAttrFmt,
                     tgfmt(prop.getConvertFromAttributeCall(),
                           &fctx.addSubst("_attr", "propAttr")
                                .addSubst("_storage", "propStorage")
                                .addSubst("_diag", "emitError")),
-                    name);
+                    name, isRequired);
   }
 
   // Generate the setter for any attribute not parsed elsewhere.
@@ -1331,20 +1417,24 @@ void OperationFormat::genElementParser(FormatElement *element, MethodBody &body,
       // If the anchor is a unit attribute, we don't need to print it. When
       // parsing, we will add this attribute if this group is present.
       FormatElement *elidedAnchorElement = nullptr;
-      auto *anchorAttr = dyn_cast<AttributeVariable>(optional->getAnchor());
-      if (anchorAttr && anchorAttr != firstElement &&
-          anchorAttr->isUnitAttr()) {
-        elidedAnchorElement = anchorAttr;
+      auto *anchorVar = dyn_cast<AttributeLikeVariable>(optional->getAnchor());
+      if (anchorVar && anchorVar != firstElement && anchorVar->isUnit()) {
+        elidedAnchorElement = anchorVar;
 
         if (!thenGroup == optional->isInverted()) {
-          // Add the anchor unit attribute to the operation state.
-          if (useProperties) {
+          // Add the anchor unit attribute or property to the operation state
+          // or set the property to true.
+          if (isa<PropertyVariable>(anchorVar)) {
+            body << formatv(
+                "    result.getOrAddProperties<{1}::Properties>().{0} = true;",
+                anchorVar->getName(), opCppClassName);
+          } else if (useProperties) {
             body << formatv(
                 "    result.getOrAddProperties<{1}::Properties>().{0} = "
                 "parser.getBuilder().getUnitAttr();",
-                anchorAttr->getVar()->name, opCppClassName);
+                anchorVar->getName(), opCppClassName);
           } else {
-            body << "    result.addAttribute(\"" << anchorAttr->getVar()->name
+            body << "    result.addAttribute(\"" << anchorVar->getName()
                  << "\", parser.getBuilder().getUnitAttr());\n";
           }
         }
@@ -1368,6 +1458,12 @@ void OperationFormat::genElementParser(FormatElement *element, MethodBody &body,
       genAttrParser(attrVar, body, attrTypeCtx, /*parseAsOptional=*/true,
                     useProperties, opCppClassName);
       body << "  if (" << attrVar->getVar()->name << "Attr) {\n";
+    } else if (auto *propVar = dyn_cast<PropertyVariable>(firstElement)) {
+      genPropertyParser(propVar, body, opCppClassName, /*requireParse=*/false);
+      body << llvm::formatv("if ({0}PropParseResult.has_value() && "
+                            "succeeded(*{0}PropParseResult)) ",
+                            propVar->getVar()->name)
+           << " {\n";
     } else if (auto *literal = dyn_cast<LiteralElement>(firstElement)) {
       body << "  if (::mlir::succeeded(parser.parseOptional";
       genLiteralParser(literal->getSpelling(), body);
@@ -1430,15 +1526,19 @@ void OperationFormat::genElementParser(FormatElement *element, MethodBody &body,
       body << ")) {\n";
       StringRef lelementName = lelement->getSpelling();
       body << formatv(oilistParserCode, lelementName);
-      if (AttributeVariable *unitAttrElem =
-              oilist->getUnitAttrParsingElement(pelement)) {
-        if (useProperties) {
+      if (AttributeLikeVariable *unitVarElem =
+              oilist->getUnitVariableParsingElement(pelement)) {
+        if (isa<PropertyVariable>(unitVarElem)) {
+          body << formatv(
+              "    result.getOrAddProperties<{1}::Properties>().{0} = true;",
+              unitVarElem->getName(), opCppClassName);
+        } else if (useProperties) {
           body << formatv(
               "    result.getOrAddProperties<{1}::Properties>().{0} = "
               "parser.getBuilder().getUnitAttr();",
-              unitAttrElem->getVar()->name, opCppClassName);
+              unitVarElem->getName(), opCppClassName);
         } else {
-          body << "  result.addAttribute(\"" << unitAttrElem->getVar()->name
+          body << "  result.addAttribute(\"" << unitVarElem->getName()
                << "\", UnitAttr::get(parser.getContext()));\n";
         }
       } else {
@@ -1468,6 +1568,8 @@ void OperationFormat::genElementParser(FormatElement *element, MethodBody &body,
         (genCtx == GenContext::Normal && attr->getVar()->attr.isOptional());
     genAttrParser(attr, body, attrTypeCtx, parseAsOptional, useProperties,
                   opCppClassName);
+  } else if (auto *prop = dyn_cast<PropertyVariable>(element)) {
+    genPropertyParser(prop, body, opCppClassName);
 
   } else if (auto *operand = dyn_cast<OperandVariable>(element)) {
     ArgumentLengthKind lengthKind = getArgumentLengthKind(operand->getVar());
@@ -1876,6 +1978,38 @@ const char *enumAttrBeginPrinterCode = R"(
     auto caseValueStr = {1}(caseValue);
 )";
 
+/// Generate a check that an optional or default-valued attribute or property
+/// has a non-default value. For these purposes, the default value of an
+/// optional attribute is its presence, even if the attribute itself has a
+/// default value.
+static void genNonDefaultValueCheck(MethodBody &body, const Operator &op,
+                                    AttributeVariable &attrElement) {
+  Attribute attr = attrElement.getVar()->attr;
+  std::string getter = op.getGetterName(attrElement.getVar()->name);
+  bool optionalAndDefault = attr.isOptional() && attr.hasDefaultValue();
+  if (optionalAndDefault)
+    body << "(";
+  if (attr.isOptional())
+    body << getter << "Attr()";
+  if (optionalAndDefault)
+    body << " && ";
+  if (attr.hasDefaultValue()) {
+    FmtContext fctx;
+    fctx.withBuilder("::mlir::OpBuilder((*this)->getContext())");
+    body << getter << "Attr() != "
+         << tgfmt(attr.getConstBuilderTemplate(), &fctx,
+                  attr.getDefaultValue());
+  }
+  if (optionalAndDefault)
+    body << ")";
+}
+
+static void genNonDefaultValueCheck(MethodBody &body, const Operator &op,
+                                    PropertyVariable &propElement) {
+  body << op.getGetterName(propElement.getVar()->name)
+       << "() != " << propElement.getVar()->prop.getDefaultValue();
+}
+
 /// Generate the printer for the 'prop-dict' directive.
 static void genPropDictPrinter(OperationFormat &fmt, Operator &op,
                                MethodBody &body) {
@@ -1904,6 +2038,15 @@ static void genPropDictPrinter(OperationFormat &fmt, Operator &op,
       body << "  }\n";
     }
   }
+  // Similarly, elide default-valued properties.
+  for (const NamedProperty &prop : op.getProperties()) {
+    if (prop.prop.hasDefaultValue()) {
+      body << "  if (" << op.getGetterName(prop.name)
+           << "() == " << prop.prop.getDefaultValue() << ") {";
+      body << "    elidedProps.push_back(\"" << prop.name << "\");\n";
+      body << "  }\n";
+    }
+  }
 
   body << "  _odsPrinter << \" \";\n"
        << "  printProperties(this->getContext(), _odsPrinter, "
@@ -2031,7 +2174,6 @@ static void genCustomDirectiveParameterPrinter(FormatElement *element,
 
   } else if (auto *property = dyn_cast<PropertyVariable>(element)) {
     FmtContext ctx;
-    ctx.addSubst("_ctxt", "getContext()");
     const NamedProperty *namedProperty = property->getVar();
     ctx.addSubst("_storage", "getProperties()." + namedProperty->name);
     body << tgfmt(namedProperty->prop.getConvertFromStorageCall(), &ctx);
@@ -2154,16 +2296,6 @@ static void genEnumAttrPrinter(const NamedAttribute *var, const Operator &op,
           "  }\n";
 }
 
-/// Generate a check that a DefaultValuedAttr has a value that is non-default.
-static void genNonDefaultValueCheck(MethodBody &body, const Operator &op,
-                                    AttributeVariable &attrElement) {
-  FmtContext fctx;
-  Attribute attr = attrElement.getVar()->attr;
-  fctx.withBuilder("::mlir::OpBuilder((*this)->getContext())");
-  body << " && " << op.getGetterName(attrElement.getVar()->name) << "Attr() != "
-       << tgfmt(attr.getConstBuilderTemplate(), &fctx, attr.getDefaultValue());
-}
-
 /// Generate the check for the anchor of an optional group.
 static void genOptionalGroupPrinterAnchor(FormatElement *anchor,
                                           const Operator &op,
@@ -2190,17 +2322,12 @@ static void genOptionalGroupPrinterAnchor(FormatElement *anchor,
         genOptionalGroupPrinterAnchor(element->getInputs(), op, body);
       })
       .Case([&](AttributeVariable *element) {
-        Attribute attr = element->getVar()->attr;
-        body << op.getGetterName(element->getVar()->name) << "Attr()";
-        if (attr.isOptional())
-          return; // done
-        if (attr.hasDefaultValue()) {
-          // Consider a default-valued attribute as present if it's not the
-          // default value.
-          genNonDefaultValueCheck(body, op, *element);
-          return;
-        }
-        llvm_unreachable("attribute must be optional or default-valued");
+        // Consider a default-valued attribute as present if it's not the
+        // default value and an optional one present if it is set.
+        genNonDefaultValueCheck(body, op, *element);
+      })
+      .Case([&](PropertyVariable *element) {
+        genNonDefaultValueCheck(body, op, *element);
       })
       .Case([&](CustomDirective *ele) {
         body << '(';
@@ -2276,10 +2403,10 @@ void OperationFormat::genElementPrinter(FormatElement *element,
     ArrayRef<FormatElement *> thenElements = optional->getThenElements();
     ArrayRef<FormatElement *> elseElements = optional->getElseElements();
     FormatElement *elidedAnchorElement = nullptr;
-    auto *anchorAttr = dyn_cast<AttributeVariable>(anchor);
+    auto *anchorAttr = dyn_cast<AttributeLikeVariable>(anchor);
     if (anchorAttr && anchorAttr != thenElements.front() &&
         (elseElements.empty() || anchorAttr != elseElements.front()) &&
-        anchorAttr->isUnitAttr()) {
+        anchorAttr->isUnit()) {
       elidedAnchorElement = anchorAttr;
     }
     auto genElementPrinters = [&](ArrayRef<FormatElement *> elements) {
@@ -2319,13 +2446,13 @@ void OperationFormat::genElementPrinter(FormatElement *element,
       for (VariableElement *var : vars) {
         TypeSwitch<FormatElement *>(var)
             .Case([&](AttributeVariable *attrEle) {
-              body << " || (" << op.getGetterName(attrEle->getVar()->name)
-                   << "Attr()";
-              Attribute attr = attrEle->getVar()->attr;
-              if (attr.hasDefaultValue()) {
-                // Don't print default-valued attributes.
-                genNonDefaultValueCheck(body, op, *attrEle);
-              }
+              body << " || (";
+              genNonDefaultValueCheck(body, op, *attrEle);
+              body << ")";
+            })
+            .Case([&](PropertyVariable *propEle) {
+              body << " || (";
+              genNonDefaultValueCheck(body, op, *propEle);
               body << ")";
             })
             .Case([&](OperandVariable *ele) {
@@ -2352,7 +2479,7 @@ void OperationFormat::genElementPrinter(FormatElement *element,
       body << ") {\n";
       genLiteralPrinter(lelement->getSpelling(), body, shouldEmitSpace,
                         lastWasPunctuation);
-      if (oilist->getUnitAttrParsingElement(pelement) == nullptr) {
+      if (oilist->getUnitVariableParsingElement(pelement) == nullptr) {
         for (FormatElement *element : pelement)
           genElementPrinter(element, body, op, shouldEmitSpace,
                             lastWasPunctuation);
@@ -2369,7 +2496,7 @@ void OperationFormat::genElementPrinter(FormatElement *element,
     return;
   }
 
-  // Emit the attribute dictionary.
+  // Emit the property dictionary.
   if (isa<PropDictDirective>(element)) {
     genPropDictPrinter(*this, op, body);
     lastWasPunctuation = false;
@@ -2408,6 +2535,13 @@ void OperationFormat::genElementPrinter(FormatElement *element,
     else
       body << "_odsPrinter.printStrippedAttrOrType("
            << op.getGetterName(var->name) << "Attr());\n";
+  } else if (auto *property = dyn_cast<PropertyVariable>(element)) {
+    const NamedProperty *var = property->getVar();
+    FmtContext fmtContext;
+    fmtContext.addSubst("_printer", "_odsPrinter");
+    fmtContext.addSubst("_ctxt", "getContext()");
+    fmtContext.addSubst("_storage", "getProperties()." + var->name);
+    body << tgfmt(var->prop.getPrinterCall(), &fmtContext) << ";\n";
   } else if (auto *operand = dyn_cast<OperandVariable>(element)) {
     if (operand->getVar()->isVariadicOfVariadic()) {
       body << "  ::llvm::interleaveComma("
@@ -2737,6 +2871,10 @@ static bool isOptionallyParsed(FormatElement *el) {
     Attribute attr = attrVar->getVar()->attr;
     return attr.isOptional() || attr.hasDefaultValue();
   }
+  if (auto *propVar = dyn_cast<PropertyVariable>(el)) {
+    const Property &prop = propVar->getVar()->prop;
+    return prop.hasDefaultValue() && prop.hasOptionalParser();
+  }
   if (auto *operandVar = dyn_cast<OperandVariable>(el)) {
     const NamedTypeConstraint *operand = operandVar->getVar();
     return operand->isOptional() || operand->isVariadic() ||
@@ -3141,10 +3279,9 @@ OpFormatParser::parseVariableImpl(SMLoc loc, StringRef name, Context ctx) {
   }
 
   if (const NamedProperty *property = findArg(op.getProperties(), name)) {
-    if (ctx != CustomDirectiveContext && ctx != RefDirectiveContext)
+    if (ctx == TypeDirectiveContext)
       return emitError(
-          loc, "properties currently only supported in `custom` directive");
-
+          loc, "properties cannot be used as children to a `type` directive");
     if (ctx == RefDirectiveContext) {
       if (!seenProperties.count(property))
         return emitError(loc, "property '" + name +
@@ -3428,6 +3565,15 @@ LogicalResult OpFormatParser::verifyOIListParsingElement(FormatElement *element,
                                       "an oilist parsing group");
               return success();
             })
+            // Only optional properties can be within an oilist parsing group.
+            .Case([&](PropertyVariable *propEle) {
+              if (!propEle->getVar()->prop.hasDefaultValue())
+                return emitError(
+                    loc,
+                    "only default-valued or optional properties can be used in "
+                    "an olist parsing group");
+              return success();
+            })
             // Only optional-like(i.e. variadic) operands can be within an
             // oilist parsing group.
             .Case([&](OperandVariable *ele) {
@@ -3557,6 +3703,16 @@ LogicalResult OpFormatParser::verifyOptionalGroupElement(SMLoc loc,
                                 "can be used to anchor an optional group");
         return success();
       })
+      // All properties can be within the optional group, but only optional
+      // properties can be the anchor.
+      .Case([&](PropertyVariable *propEle) {
+        Property prop = propEle->getVar()->prop;
+        if (isAnchor && !(prop.hasDefaultValue() && prop.hasOptionalParser()))
+          return emitError(loc, "only properties with default values "
+                                "that can be optionally parsed "
+                                "can be used to anchor an optional group");
+        return success();
+      })
       // Only optional-like(i.e. variadic) operands can be within an optional
       // group.
       .Case([&](OperandVariable *ele) {

>From 6f502de14b077c1e0e441a8824ab9814d5212638 Mon Sep 17 00:00:00 2001
From: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
Date: Mon, 17 Jun 2024 23:48:54 -0500
Subject: [PATCH 2/5] Update mlir/docs/DefiningDialects/Operations.md to fix
 typo

Co-authored-by: Mehdi Amini <joker.eph at gmail.com>
---
 mlir/docs/DefiningDialects/Operations.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mlir/docs/DefiningDialects/Operations.md b/mlir/docs/DefiningDialects/Operations.md
index b011375bb3f9a..f5ab1e6b4454d 100644
--- a/mlir/docs/DefiningDialects/Operations.md
+++ b/mlir/docs/DefiningDialects/Operations.md
@@ -946,7 +946,7 @@ optional-group: `(` then-elements `)` (`:` `(` else-elements `)`)? `?`
 The elements of an optional group have the following requirements:
 
 *   The first element of `then-elements` must either be a attribute, literal,
-    operand,property, or region.
+    operand, property, or region.
     -   This is because the first element must be optionally parsable.
     -   If a property is used, it must have an `optionalParser` defined and have a
         default value.

>From f0a865687f893dce7181d80d330a56746fcd8de4 Mon Sep 17 00:00:00 2001
From: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
Date: Wed, 19 Jun 2024 18:18:34 -0500
Subject: [PATCH 3/5] Fix typos

Co-authored-by: Christian Ulmann <christianulmann at gmail.com>
---
 mlir/docs/DefiningDialects/Operations.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mlir/docs/DefiningDialects/Operations.md b/mlir/docs/DefiningDialects/Operations.md
index f5ab1e6b4454d..c252d9caf98eb 100644
--- a/mlir/docs/DefiningDialects/Operations.md
+++ b/mlir/docs/DefiningDialects/Operations.md
@@ -193,7 +193,7 @@ are compile-time known constant values, including two categories:
 Properties are similar to attributes, except that they are not stored within
 the MLIR context but are stored inline with the operation.
 
-Operands, attributes, and properties  are specified inside the `dag`-typed
+Operands, attributes, and properties are specified inside the `dag`-typed
 `arguments`, led by `ins`:
 
 ```tablegen

>From 66f5843ff3032335537d201c313f55a79325e033 Mon Sep 17 00:00:00 2001
From: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
Date: Wed, 19 Jun 2024 23:28:25 +0000
Subject: [PATCH 4/5] Fix typos

---
 mlir/include/mlir/IR/Properties.td | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/mlir/include/mlir/IR/Properties.td b/mlir/include/mlir/IR/Properties.td
index 1b6f5aa68c83b..94bf5febf96bd 100644
--- a/mlir/include/mlir/IR/Properties.td
+++ b/mlir/include/mlir/IR/Properties.td
@@ -80,7 +80,7 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // - `$_parser` is the OpAsmParser.
   // - `$_storage` is the location into which the value is to be placed if it is
   //  present.
-  // - `$_cxtx` is a `MLIRContext *`
+  // - `$_ctxt` is a `MLIRContext *`
   //
   // This defines the body of a function (typically a lambda) that returns a
   // ParseResult. There is an implicit `return success()` at the end of the parser
@@ -103,8 +103,6 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // This has the same context and substitutions as `parser` except that it is
   // required to return an OptionalParseResult.
   //
-  // Note that the printer for a property should always print a non-empty value.
-  //
   // If the optional parser doesn't parse anything, it should not set
   // $_storage, since the parser doesn't know if the default value has been
   // overwritten.
@@ -117,7 +115,10 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // - `$_ctxt` is a `MLIRContext *`
   //
   // This may be called in an expression context, so variable declarations must
-  // be praced within a new scope.
+  // be placed within a new scope.
+  //
+  // The printer for a property should always print a non-empty value - default value
+  // printing elision happens outside the context of this printing expression.
   code printer = "$_printer << $_storage";
 
   // The call expression to emit the storage type to bytecode.
@@ -344,6 +345,8 @@ class _makePropStorage<Property prop, string name> {
 /// The generic class for arrays of some other property, which is stored as a
 /// `SmallVector` of that property. This uses an `ArrayAttr` as its attribute form
 /// though subclasses can override this, as is the case with IntArrayAttr below.
+/// Those wishing to use a non-default number of SmallVector elements should
+/// subclass `ArrayProperty`.
 class ArrayProperty<Property elem = Property<>, string desc = ""> :
   Property<"::llvm::SmallVector<" # elem.storageType # ">", desc> {
   let summary = "array of " # elem.summary;

>From 97a48b193937f49c881a3aee7ea41c4afe26a616 Mon Sep 17 00:00:00 2001
From: Krzysztof Drewniak <Krzysztof.Drewniak at amd.com>
Date: Wed, 19 Jun 2024 18:29:15 -0500
Subject: [PATCH 5/5] Update comment

Co-authored-by: Christian Ulmann <christianulmann at gmail.com>
---
 mlir/include/mlir/IR/Properties.td | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mlir/include/mlir/IR/Properties.td b/mlir/include/mlir/IR/Properties.td
index 94bf5febf96bd..0becf7d009835 100644
--- a/mlir/include/mlir/IR/Properties.td
+++ b/mlir/include/mlir/IR/Properties.td
@@ -162,7 +162,7 @@ class Property<string storageTypeParam = "", string desc = ""> {
   // If set, the default value the storage of the property should be initilized to.
   // This is only needed when the storage and interface types of the property
   // are distinct (ex. SmallVector for storage vs. ArrayRef for interfacing), as it
-  // will fall back to defaultValue when unspecified.
+  // will fall back to `defaultValue` when unspecified.
   string storageTypeValueOverride = "";
 }
 



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