clang-p2996/mlir/test/lib/Dialect/Transform/TestTransformDialectExtension.cpp

//===- TestTransformDialectExtension.cpp ----------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines an extension of the MLIR Transform dialect for testing
// purposes.
//
//===----------------------------------------------------------------------===//

#include "TestTransformDialectExtension.h"
#include "TestTransformStateExtension.h"
#include "mlir/Dialect/PDL/IR/PDL.h"
#include "mlir/Dialect/Transform/IR/TransformDialect.h"
#include "mlir/Dialect/Transform/IR/TransformInterfaces.h"
#include "mlir/Dialect/Transform/IR/TransformOps.h"
#include "mlir/Dialect/Transform/PDLExtension/PDLExtensionOps.h"
#include "mlir/IR/OpImplementation.h"
#include "mlir/IR/PatternMatch.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/TypeSwitch.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/raw_ostream.h"

using namespace mlir;

namespace {
/// Simple transform op defined outside of the dialect. Just emits a remark when
/// applied. This op is defined in C++ to test that C++ definitions also work
/// for op injection into the Transform dialect.
class TestTransformOp
    : public Op<TestTransformOp, transform::TransformOpInterface::Trait,
                MemoryEffectOpInterface::Trait> {
public:
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(TestTransformOp)

  using Op::Op;

  static ArrayRef<StringRef> getAttributeNames() { return {}; }

  static constexpr llvm::StringLiteral getOperationName() {
    return llvm::StringLiteral("transform.test_transform_op");
  }

  DiagnosedSilenceableFailure apply(transform::TransformResults &results,
                                    transform::TransformState &state) {
    InFlightDiagnostic remark = emitRemark() << "applying transformation";
    if (Attribute message = getMessage())
      remark << " " << message;

    return DiagnosedSilenceableFailure::success();
  }

  Attribute getMessage() { return getOperation()->getAttr("message"); }

  static ParseResult parse(OpAsmParser &parser, OperationState &state) {
    StringAttr message;
    OptionalParseResult result = parser.parseOptionalAttribute(message);
    if (!result.has_value())
      return success();

    if (result.value().succeeded())
      state.addAttribute("message", message);
    return result.value();
  }

  void print(OpAsmPrinter &printer) {
    if (getMessage())
      printer << " " << getMessage();
  }

  // No side effects.
  void getEffects(SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {}
};

/// A test op to exercise the verifier of the PossibleTopLevelTransformOpTrait
/// in cases where it is attached to ops that do not comply with the trait
/// requirements. This op cannot be defined in ODS because ODS generates strict
/// verifiers that overalp with those in the trait and run earlier.
class TestTransformUnrestrictedOpNoInterface
    : public Op<TestTransformUnrestrictedOpNoInterface,
                transform::PossibleTopLevelTransformOpTrait,
                transform::TransformOpInterface::Trait,
                MemoryEffectOpInterface::Trait> {
public:
  MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(
      TestTransformUnrestrictedOpNoInterface)

  using Op::Op;

  static ArrayRef<StringRef> getAttributeNames() { return {}; }

  static constexpr llvm::StringLiteral getOperationName() {
    return llvm::StringLiteral(
        "transform.test_transform_unrestricted_op_no_interface");
  }

  DiagnosedSilenceableFailure apply(transform::TransformResults &results,
                                    transform::TransformState &state) {
    return DiagnosedSilenceableFailure::success();
  }

  // No side effects.
  void getEffects(SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {}
};
} // namespace

DiagnosedSilenceableFailure
mlir::test::TestProduceSelfHandleOrForwardOperandOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  if (getOperation()->getNumOperands() != 0) {
    results.set(cast<OpResult>(getResult()),
                {getOperation()->getOperand(0).getDefiningOp()});
  } else {
    results.set(cast<OpResult>(getResult()), {getOperation()});
  }
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceSelfHandleOrForwardOperandOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  if (getOperand())
    transform::onlyReadsHandle(getOperand(), effects);
  transform::producesHandle(getRes(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceValueHandleToSelfOperand::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  results.setValues(llvm::cast<OpResult>(getOut()), getIn());
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceValueHandleToSelfOperand::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::producesHandle(getOut(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceValueHandleToResult::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  if (target->getNumResults() <= getNumber())
    return emitSilenceableError() << "payload has no result #" << getNumber();
  results.push_back(target->getResult(getNumber()));
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceValueHandleToResult::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::producesHandle(getOut(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceValueHandleToArgumentOfParentBlock::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  if (!target->getBlock())
    return emitSilenceableError() << "payload has no parent block";
  if (target->getBlock()->getNumArguments() <= getNumber())
    return emitSilenceableError()
           << "parent of the payload has no argument #" << getNumber();
  results.push_back(target->getBlock()->getArgument(getNumber()));
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceValueHandleToArgumentOfParentBlock::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::producesHandle(getOut(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestConsumeOperand::apply(transform::TransformResults &results,
                                      transform::TransformState &state) {
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestConsumeOperand::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::consumesHandle(getOperand(), effects);
  if (getSecondOperand())
    transform::consumesHandle(getSecondOperand(), effects);
  transform::modifiesPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestConsumeOperandOfOpKindOrFail::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  auto payload = state.getPayloadOps(getOperand());
  assert(llvm::hasSingleElement(payload) && "expected a single target op");
  if ((*payload.begin())->getName().getStringRef() != getOpKind()) {
    return emitSilenceableError()
           << "op expected the operand to be associated a payload op of kind "
           << getOpKind() << " got "
           << (*payload.begin())->getName().getStringRef();
  }

  emitRemark() << "succeeded";
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestConsumeOperandOfOpKindOrFail::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::consumesHandle(getOperand(), effects);
  transform::modifiesPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestSucceedIfOperandOfOpKind::matchOperation(
    Operation *op, transform::TransformResults &results,
    transform::TransformState &state) {
  if (op->getName().getStringRef() != getOpKind()) {
    return emitSilenceableError()
           << "op expected the operand to be associated with a payload op of "
              "kind "
           << getOpKind() << " got " << op->getName().getStringRef();
  }
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestSucceedIfOperandOfOpKind::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getOperand(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestPrintRemarkAtOperandOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  auto payload = state.getPayloadOps(getOperand());
  for (Operation *op : payload)
    op->emitRemark() << getMessage();

  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestPrintRemarkAtOperandOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getOperand(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestPrintRemarkAtOperandValue::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  ArrayRef<Value> values = state.getPayloadValues(getIn());
  for (Value value : values) {
    std::string note;
    llvm::raw_string_ostream os(note);
    if (auto arg = llvm::dyn_cast<BlockArgument>(value)) {
      os << "a block argument #" << arg.getArgNumber() << " in block #"
         << std::distance(arg.getOwner()->getParent()->begin(),
                          arg.getOwner()->getIterator())
         << " in region #" << arg.getOwner()->getParent()->getRegionNumber();
    } else {
      os << "an op result #" << llvm::cast<OpResult>(value).getResultNumber();
    }
    InFlightDiagnostic diag = ::emitRemark(value.getLoc()) << getMessage();
    diag.attachNote() << "value handle points to " << os.str();
  }
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestPrintRemarkAtOperandValue::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestAddTestExtensionOp::apply(transform::TransformResults &results,
                                          transform::TransformState &state) {
  state.addExtension<TestTransformStateExtension>(getMessageAttr());
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestCheckIfTestExtensionPresentOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  auto *extension = state.getExtension<TestTransformStateExtension>();
  if (!extension) {
    emitRemark() << "extension absent";
    return DiagnosedSilenceableFailure::success();
  }

  InFlightDiagnostic diag = emitRemark()
                            << "extension present, " << extension->getMessage();
  for (Operation *payload : state.getPayloadOps(getOperand())) {
    diag.attachNote(payload->getLoc()) << "associated payload op";
#ifndef NDEBUG
    SmallVector<Value> handles;
    assert(succeeded(state.getHandlesForPayloadOp(payload, handles)));
    assert(llvm::is_contained(handles, getOperand()) &&
           "inconsistent mapping between transform IR handles and payload IR "
           "operations");
#endif // NDEBUG
  }

  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestCheckIfTestExtensionPresentOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getOperand(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestRemapOperandPayloadToSelfOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  auto *extension = state.getExtension<TestTransformStateExtension>();
  if (!extension)
    return emitDefiniteFailure("TestTransformStateExtension missing");

  if (failed(extension->updateMapping(
          *state.getPayloadOps(getOperand()).begin(), getOperation())))
    return DiagnosedSilenceableFailure::definiteFailure();
  if (getNumResults() > 0)
    results.set(cast<OpResult>(getResult(0)), {getOperation()});
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestRemapOperandPayloadToSelfOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getOperand(), effects);
  transform::producesHandle(getOut(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestRemoveTestExtensionOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  state.removeExtension<TestTransformStateExtension>();
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestReversePayloadOpsOp::apply(transform::TransformResults &results,
                                           transform::TransformState &state) {
  auto payloadOps = state.getPayloadOps(getTarget());
  auto reversedOps = llvm::to_vector(llvm::reverse(payloadOps));
  results.set(llvm::cast<OpResult>(getResult()), reversedOps);
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure mlir::test::TestTransformOpWithRegions::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestTransformOpWithRegions::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {}

DiagnosedSilenceableFailure
mlir::test::TestBranchingTransformOpTerminator::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestBranchingTransformOpTerminator::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {}

DiagnosedSilenceableFailure mlir::test::TestEmitRemarkAndEraseOperandOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  emitRemark() << getRemark();
  for (Operation *op : state.getPayloadOps(getTarget()))
    op->erase();

  if (getFailAfterErase())
    return emitSilenceableError() << "silenceable error";
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestEmitRemarkAndEraseOperandOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::consumesHandle(getTarget(), effects);
  transform::modifiesPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestWrongNumberOfResultsOp::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  OperationState opState(target->getLoc(), "foo");
  results.push_back(OpBuilder(target).create(opState));
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestWrongNumberOfMultiResultsOp::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  static int count = 0;
  if (count++ == 0) {
    OperationState opState(target->getLoc(), "foo");
    results.push_back(OpBuilder(target).create(opState));
  }
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestCorrectNumberOfMultiResultsOp::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  OperationState opState(target->getLoc(), "foo");
  results.push_back(OpBuilder(target).create(opState));
  results.push_back(OpBuilder(target).create(opState));
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestMixedNullAndNonNullResultsOp::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  OperationState opState(target->getLoc(), "foo");
  results.push_back(nullptr);
  results.push_back(OpBuilder(target).create(opState));
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestMixedSuccessAndSilenceableOp::applyToOne(
    Operation *target, transform::ApplyToEachResultList &results,
    transform::TransformState &state) {
  if (target->hasAttr("target_me"))
    return DiagnosedSilenceableFailure::success();
  return emitDefaultSilenceableFailure(target);
}

DiagnosedSilenceableFailure
mlir::test::TestPrintNumberOfAssociatedPayloadIROps::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  if (!getHandle())
    emitRemark() << 0;
  emitRemark() << llvm::range_size(state.getPayloadOps(getHandle()));
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestPrintNumberOfAssociatedPayloadIROps::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getHandle(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestCopyPayloadOp::apply(transform::TransformResults &results,
                                     transform::TransformState &state) {
  results.set(llvm::cast<OpResult>(getCopy()),
              state.getPayloadOps(getHandle()));
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestCopyPayloadOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getHandle(), effects);
  transform::producesHandle(getCopy(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure mlir::transform::TestDialectOpType::checkPayload(
    Location loc, ArrayRef<Operation *> payload) const {
  if (payload.empty())
    return DiagnosedSilenceableFailure::success();

  for (Operation *op : payload) {
    if (op->getName().getDialectNamespace() != "test") {
      return emitSilenceableError(loc) << "expected the payload operation to "
                                          "belong to the 'test' dialect";
    }
  }

  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure mlir::transform::TestDialectParamType::checkPayload(
    Location loc, ArrayRef<Attribute> payload) const {
  for (Attribute attr : payload) {
    auto integerAttr = llvm::dyn_cast<IntegerAttr>(attr);
    if (integerAttr && integerAttr.getType().isSignlessInteger(32))
      continue;
    return emitSilenceableError(loc)
           << "expected the parameter to be a i32 integer attribute";
  }

  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestReportNumberOfTrackedHandlesNestedUnder::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getTarget(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestReportNumberOfTrackedHandlesNestedUnder::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  int64_t count = 0;
  for (Operation *op : state.getPayloadOps(getTarget())) {
    op->walk([&](Operation *nested) {
      SmallVector<Value> handles;
      (void)state.getHandlesForPayloadOp(nested, handles);
      count += handles.size();
    });
  }
  emitRemark() << count << " handles nested under";
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestPrintParamOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getParam(), effects);
  if (getAnchor())
    transform::onlyReadsHandle(getAnchor(), effects);
  transform::onlyReadsPayload(effects);
}

DiagnosedSilenceableFailure
mlir::test::TestPrintParamOp::apply(transform::TransformResults &results,
                                    transform::TransformState &state) {
  std::string str;
  llvm::raw_string_ostream os(str);
  if (getMessage())
    os << *getMessage() << " ";
  llvm::interleaveComma(state.getParams(getParam()), os);
  if (!getAnchor()) {
    emitRemark() << os.str();
    return DiagnosedSilenceableFailure::success();
  }
  for (Operation *payload : state.getPayloadOps(getAnchor()))
    ::mlir::emitRemark(payload->getLoc()) << os.str();
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestAddToParamOp::apply(transform::TransformResults &results,
                                    transform::TransformState &state) {
  SmallVector<uint32_t> values(/*Size=*/1, /*Value=*/0);
  if (Value param = getParam()) {
    values = llvm::to_vector(
        llvm::map_range(state.getParams(param), [](Attribute attr) -> uint32_t {
          return llvm::cast<IntegerAttr>(attr).getValue().getLimitedValue(
              UINT32_MAX);
        }));
  }

  Builder builder(getContext());
  SmallVector<Attribute> result = llvm::to_vector(
      llvm::map_range(values, [this, &builder](uint32_t value) -> Attribute {
        return builder.getI32IntegerAttr(value + getAddendum());
      }));
  results.setParams(llvm::cast<OpResult>(getResult()), result);
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestProduceParamWithNumberOfTestOps::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  Builder builder(getContext());
  SmallVector<Attribute> result = llvm::to_vector(
      llvm::map_range(state.getPayloadOps(getHandle()),
                      [&builder](Operation *payload) -> Attribute {
                        int32_t count = 0;
                        payload->walk([&count](Operation *op) {
                          if (op->getName().getDialectNamespace() == "test")
                            ++count;
                        });
                        return builder.getI32IntegerAttr(count);
                      }));
  results.setParams(llvm::cast<OpResult>(getResult()), result);
  return DiagnosedSilenceableFailure::success();
}

DiagnosedSilenceableFailure
mlir::test::TestProduceIntegerParamWithTypeOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  Attribute zero = IntegerAttr::get(getType(), 0);
  results.setParams(llvm::cast<OpResult>(getResult()), zero);
  return DiagnosedSilenceableFailure::success();
}

LogicalResult mlir::test::TestProduceIntegerParamWithTypeOp::verify() {
  if (!llvm::isa<IntegerType>(getType())) {
    return emitOpError() << "expects an integer type";
  }
  return success();
}

void mlir::test::TestProduceTransformParamOrForwardOperandOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::producesHandle(getOut(), effects);
  transform::producesHandle(getParam(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceTransformParamOrForwardOperandOp::applyToOne(
    Operation *target, ::transform::ApplyToEachResultList &results,
    ::transform::TransformState &state) {
  Builder builder(getContext());
  if (getFirstResultIsParam()) {
    results.push_back(builder.getI64IntegerAttr(0));
  } else if (getFirstResultIsNull()) {
    results.push_back(nullptr);
  } else {
    results.push_back(*state.getPayloadOps(getIn()).begin());
  }

  if (getSecondResultIsHandle()) {
    results.push_back(*state.getPayloadOps(getIn()).begin());
  } else {
    results.push_back(builder.getI64IntegerAttr(42));
  }

  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceNullPayloadOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::producesHandle(getOut(), effects);
}

DiagnosedSilenceableFailure mlir::test::TestProduceNullPayloadOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  SmallVector<Operation *, 1> null({nullptr});
  results.set(llvm::cast<OpResult>(getOut()), null);
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceNullParamOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::producesHandle(getOut(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceNullParamOp::apply(transform::TransformResults &results,
                                          transform::TransformState &state) {
  results.setParams(llvm::cast<OpResult>(getOut()), Attribute());
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestProduceNullValueOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::producesHandle(getOut(), effects);
}

DiagnosedSilenceableFailure
mlir::test::TestProduceNullValueOp::apply(transform::TransformResults &results,
                                          transform::TransformState &state) {
  results.setValues(llvm::cast<OpResult>(getOut()), Value());
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestRequiredMemoryEffectsOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  if (getHasOperandEffect())
    transform::consumesHandle(getIn(), effects);

  if (getHasResultEffect())
    transform::producesHandle(getOut(), effects);
  else
    transform::onlyReadsHandle(getOut(), effects);

  if (getModifiesPayload())
    transform::modifiesPayload(effects);
}

DiagnosedSilenceableFailure mlir::test::TestRequiredMemoryEffectsOp::apply(
    transform::TransformResults &results, transform::TransformState &state) {
  results.set(llvm::cast<OpResult>(getOut()), state.getPayloadOps(getIn()));
  return DiagnosedSilenceableFailure::success();
}

void mlir::test::TestTrackedRewriteOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  transform::onlyReadsHandle(getIn(), effects);
  transform::modifiesPayload(effects);
}

namespace {
/// A TrackingListener for test cases. When the replacement op is
/// "test.update_mapping", it is considered as a replacement op in the transform
/// state mapping. Otherwise, it is not and the original op is simply removed
/// from the mapping.
class TestTrackingListener : public transform::TrackingListener {
  using transform::TrackingListener::TrackingListener;

protected:
  Operation *findReplacementOp(Operation *op,
                               ValueRange newValues) const override {
    if (newValues.size() != 1)
      return nullptr;
    Operation *replacement = newValues[0].getDefiningOp();
    if (!replacement)
      return nullptr;
    if (replacement->getName().getStringRef() != "test.update_mapping")
      return nullptr;
    return replacement;
  }
};
} // namespace

DiagnosedSilenceableFailure
mlir::test::TestTrackedRewriteOp::apply(transform::TransformResults &results,
                                        transform::TransformState &state) {
  TestTrackingListener listener(state, *this);
  IRRewriter rewriter(getContext(), &listener);
  int64_t numIterations = 0;

  // `getPayloadOps` returns an iterator that skips ops that are erased in the
  // loop body. Replacement ops are not enumerated.
  for (Operation *op : state.getPayloadOps(getIn())) {
    ++numIterations;
    rewriter.setInsertionPointToEnd(op->getBlock());

    // Erase all payload ops. The outer loop should have only one iteration.
    for (Operation *op : state.getPayloadOps(getIn())) {
      if (op->getName().getStringRef() != "test.replace_me")
        continue;
      auto replacementName = op->getAttrOfType<StringAttr>("replacement");
      if (!replacementName)
        continue;
      SmallVector<NamedAttribute> attributes;
      attributes.emplace_back(rewriter.getStringAttr("original_op"),
                              op->getName().getIdentifier());
      OperationState opState(op->getLoc(), replacementName,
                             /*operands=*/ValueRange(),
                             /*types=*/op->getResultTypes(), attributes);
      Operation *newOp = rewriter.create(opState);
      rewriter.replaceOp(op, newOp->getResults());
    }
  }

  emitRemark() << numIterations << " iterations";
  return DiagnosedSilenceableFailure::success();
}

namespace {
/// Test extension of the Transform dialect. Registers additional ops and
/// declares PDL as dependent dialect since the additional ops are using PDL
/// types for operands and results.
class TestTransformDialectExtension
    : public transform::TransformDialectExtension<
          TestTransformDialectExtension> {
public:
  using Base::Base;

  void init() {
    declareDependentDialect<pdl::PDLDialect>();
    registerTransformOps<TestTransformOp,
                         TestTransformUnrestrictedOpNoInterface,
#define GET_OP_LIST
#include "TestTransformDialectExtension.cpp.inc"
                         >();
    registerTypes<
#define GET_TYPEDEF_LIST
#include "TestTransformDialectExtensionTypes.cpp.inc"
        >();

    auto verboseConstraint = [](PatternRewriter &rewriter,
                                ArrayRef<PDLValue> pdlValues) {
      for (const PDLValue &pdlValue : pdlValues) {
        if (Operation *op = pdlValue.dyn_cast<Operation *>()) {
          op->emitWarning() << "from PDL constraint";
        }
      }
      return success();
    };

    addDialectDataInitializer<transform::PDLMatchHooks>(
        [&](transform::PDLMatchHooks &hooks) {
          llvm::StringMap<PDLConstraintFunction> constraints;
          constraints.try_emplace("verbose_constraint", verboseConstraint);
          hooks.mergeInPDLMatchHooks(std::move(constraints));
        });
  }
};
} // namespace

// These are automatically generated by ODS but are not used as the Transform
// dialect uses a different dispatch mechanism to support dialect extensions.
LLVM_ATTRIBUTE_UNUSED static OptionalParseResult
generatedTypeParser(AsmParser &parser, StringRef *mnemonic, Type &value);
LLVM_ATTRIBUTE_UNUSED static LogicalResult
generatedTypePrinter(Type def, AsmPrinter &printer);

#define GET_TYPEDEF_CLASSES
#include "TestTransformDialectExtensionTypes.cpp.inc"

#define GET_OP_CLASSES
#include "TestTransformDialectExtension.cpp.inc"

void ::test::registerTestTransformDialectExtension(DialectRegistry &registry) {
  registry.addExtensions<TestTransformDialectExtension>();
}