[MLIR][TableGen] Add default value for named attributes for 2 more build methods

[jurahul]

Summary

• Added more default values for attributes parameter for 2 more build methods
• Extend the op-decls.td unit test to test these build methods.

[jurahul]

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

1064

Note, eliminating use of formatv() as it does not correctly handle escaped closing braces. I have put up a fix for that (https://reviews.llvm.org/D83837) but here we don't need to use formatv.

[jpienaar]

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

1033

Part of me wonders if we should where ops has required attributes. E.g., if we know op X requires an attribute (not default and not optional), then any invocation of build that doesn't pass an attribute will fail verification. Unless added later which we would have no knowledge of here, but this would force them to think about it.

I'm not sure the value of complicating this for that use though, so good as is.

1064

Interesting, I thought there was some trick wrt escaping that we had used elsewhere.

[jurahul]

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

1033

FYI, I have seen cases of this where we call build() with empty attributes and then tack on a bunch of attributes on the generated operation.

mlir/test/mlir-tblgen/op-decl.td

def NS_HCollectiveParamsSuppress2Op : NS_Op<"op_collective_suppress2", [SameVariadicResultSize]> {
   let arguments = (ins Variadic<I32>:$a);
   let results = (outs Variadic<I32>:$b, Variadic<F32>:$c);
 }
 // CHECK_LABEL: class NS_HCollectiveParamsSuppress2Op :
 // CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> b, ::llvm::ArrayRef<::mlir::Type> c, ::mlir::ValueRange a);
 // CHECK-NOT: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> b, ::mlir::ValueRange a);
 // CHECK: static void build(::mlir::OpBuilder &, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> resultTypes, ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> attributes = {});
 
+// Check default value of `attributes` for the `genUseOperandAsResultTypeCollectiveParamBuilder` builder
+def NS_IOp : NS_Op<"op_with_same_operands_and_result_types_trait", [SameOperandsAndResultType]> {
+  let arguments = (ins AnyType:$a, AnyType:$b);
+  let results = (outs AnyType:$r);
+}
+// CHECK_LABEL: class NS_IOp :
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::Type r, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> resultTypes, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> resultTypes, ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> attributes = {});
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> attributes = {});
+
+// Check default value of `attributes` for the `genInferredTypeCollectiveParamBuilder` builder
+def NS_JOp : NS_Op<"op_with_InferTypeOpInterface_interface", [DeclareOpInterfaceMethods<InferTypeOpInterface>]> {
+  let arguments = (ins AnyType:$a, AnyType:$b);
+  let results = (outs AnyType:$r);
+}
+// CHECK_LABEL: class NS_JOp :
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::Type r, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> resultTypes, ::mlir::Value a, ::mlir::Value b);
+// CHECK: static void build(::mlir::OpBuilder &, ::mlir::OperationState &odsState, ::llvm::ArrayRef<::mlir::Type> resultTypes, ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> attributes = {});
+// CHECK: static void build(::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &odsState, ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> attributes = {});
+
 // Check that default builders can be suppressed.
 // ---
 
 def NS_SkipDefaultBuildersOp : NS_Op<"skip_default_builders", []> {
   let skipDefaultBuilders = 1;
   let builders = [OpBuilder<"Value val">];
 }
 

mlir/tools/mlir-tblgen/OpDefinitionsGen.cpp

void OpEmitter::genUseOperandAsResultTypeCollectiveParamBuilder() {
   int numResults = op.getNumResults();
 
   // Signature
   std::string params =
       std::string("::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &") +
       builderOpState +
       ", ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> "
       "attributes";
-  if (op.getNumVariadicRegions())
+  if (op.getNumVariadicRegions()) {
     params += ", unsigned numRegions";
+  } else {
+    // Provide default value for `attributes` since its the last parameter
+    params += " = {}";
+  }
   auto &m = opClass.newMethod("void", "build", params, OpMethod::MP_Static);
   auto &body = m.body();
 
   // Operands
   body << "  " << builderOpState << ".addOperands(operands);\n";
 
   // Attributes
   body << "  " << builderOpState << ".addAttributes(attributes);\n";
void OpEmitter::genUseOperandAsResultTypeCollectiveParamBuilder() {
   // Result types
   SmallVector<std::string, 2> resultTypes(numResults, "operands[0].getType()");
   body << "  " << builderOpState << ".addTypes({"
        << llvm::join(resultTypes, ", ") << "});\n\n";
 }
 
 void OpEmitter::genInferredTypeCollectiveParamBuilder() {
   // TODO: Expand to support regions.
-  const char *params =
-      "::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &{0}, "
-      "::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> "
-      "attributes";
-  auto &m =
-      opClass.newMethod("void", "build", formatv(params, builderOpState).str(),
-                        OpMethod::MP_Static);
+  std::string params =
+      std::string("::mlir::OpBuilder &odsBuilder, ::mlir::OperationState &") +
+      builderOpState +
+      ", ::mlir::ValueRange operands, ::llvm::ArrayRef<::mlir::NamedAttribute> "
+      "attributes = {}";
+  auto &m = opClass.newMethod("void", "build", params, OpMethod::MP_Static);
   auto &body = m.body();
 
   int numResults = op.getNumResults();
   int numVariadicResults = op.getNumVariableLengthResults();
   int numNonVariadicResults = numResults - numVariadicResults;
 
   int numOperands = op.getNumOperands();
   int numVariadicOperands = op.getNumVariableLengthOperands();