Dialect/Test/TestDialect.cpp

//===- TestDialect.cpp - MLIR Dialect for Testing -------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#include "TestDialect.h"
#include "TestAttributes.h"
#include "TestInterfaces.h"
#include "TestTypes.h"
#include "mlir/Dialect/Arithmetic/IR/Arithmetic.h"
#include "mlir/Dialect/DLTI/DLTI.h"
#include "mlir/Dialect/StandardOps/IR/Ops.h"
#include "mlir/Dialect/Tensor/IR/Tensor.h"
#include "mlir/IR/BuiltinOps.h"
#include "mlir/IR/DialectImplementation.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/IR/TypeUtilities.h"
#include "mlir/Reducer/ReductionPatternInterface.h"
#include "mlir/Transforms/FoldUtils.h"
#include "mlir/Transforms/InliningUtils.h"
#include "llvm/ADT/StringSwitch.h"

// Include this before the using namespace lines below to
// test that we don't have namespace dependencies.
#include "TestOpsDialect.cpp.inc"

using namespace mlir;
using namespace test;

void test::registerTestDialect(DialectRegistry &registry) {
  registry.insert<TestDialect>();
}

//===----------------------------------------------------------------------===//
// TestDialect Interfaces
//===----------------------------------------------------------------------===//

namespace {

/// Testing the correctness of some traits.
static_assert(
    llvm::is_detected<OpTrait::has_implicit_terminator_t,
                      SingleBlockImplicitTerminatorOp>::value,
    "has_implicit_terminator_t does not match SingleBlockImplicitTerminatorOp");
static_assert(OpTrait::hasSingleBlockImplicitTerminator<
                  SingleBlockImplicitTerminatorOp>::value,
              "hasSingleBlockImplicitTerminator does not match "
              "SingleBlockImplicitTerminatorOp");

// Test support for interacting with the AsmPrinter.
struct TestOpAsmInterface : public OpAsmDialectInterface {
  using OpAsmDialectInterface::OpAsmDialectInterface;

  AliasResult getAlias(Attribute attr, raw_ostream &os) const final {
    StringAttr strAttr = attr.dyn_cast<StringAttr>();
    if (!strAttr)
      return AliasResult::NoAlias;

    // Check the contents of the string attribute to see what the test alias
    // should be named.
    Optional<StringRef> aliasName =
        StringSwitch<Optional<StringRef>>(strAttr.getValue())
            .Case("alias_test:dot_in_name", StringRef("test.alias"))
            .Case("alias_test:trailing_digit", StringRef("test_alias0"))
            .Case("alias_test:prefixed_digit", StringRef("0_test_alias"))
            .Case("alias_test:sanitize_conflict_a",
                  StringRef("test_alias_conflict0"))
            .Case("alias_test:sanitize_conflict_b",
                  StringRef("test_alias_conflict0_"))
            .Case("alias_test:tensor_encoding", StringRef("test_encoding"))
            .Default(llvm::None);
    if (!aliasName)
      return AliasResult::NoAlias;

    os << *aliasName;
    return AliasResult::FinalAlias;
  }

  AliasResult getAlias(Type type, raw_ostream &os) const final {
    if (auto tupleType = type.dyn_cast<TupleType>()) {
      if (tupleType.size() > 0 &&
          llvm::all_of(tupleType.getTypes(), [](Type elemType) {
            return elemType.isa<SimpleAType>();
          })) {
        os << "test_tuple";
        return AliasResult::FinalAlias;
      }
    }
    if (auto intType = type.dyn_cast<TestIntegerType>()) {
      if (intType.getSignedness() ==
              TestIntegerType::SignednessSemantics::Unsigned &&
          intType.getWidth() == 8) {
        os << "test_ui8";
        return AliasResult::FinalAlias;
      }
    }
    return AliasResult::NoAlias;
  }
};

struct TestDialectFoldInterface : public DialectFoldInterface {
  using DialectFoldInterface::DialectFoldInterface;

  /// Registered hook to check if the given region, which is attached to an
  /// operation that is *not* isolated from above, should be used when
  /// materializing constants.
  bool shouldMaterializeInto(Region *region) const final {
    // If this is a one region operation, then insert into it.
    return isa<OneRegionOp>(region->getParentOp());
  }
};

/// This class defines the interface for handling inlining with standard
/// operations.
struct TestInlinerInterface : public DialectInlinerInterface {
  using DialectInlinerInterface::DialectInlinerInterface;

  //===--------------------------------------------------------------------===//
  // Analysis Hooks
  //===--------------------------------------------------------------------===//

  bool isLegalToInline(Operation *call, Operation *callable,
                       bool wouldBeCloned) const final {
    // Don't allow inlining calls that are marked `noinline`.
    return !call->hasAttr("noinline");
  }
  bool isLegalToInline(Region *, Region *, bool,
                       BlockAndValueMapping &) const final {
    // Inlining into test dialect regions is legal.
    return true;
  }
  bool isLegalToInline(Operation *, Region *, bool,
                       BlockAndValueMapping &) const final {
    return true;
  }

  bool shouldAnalyzeRecursively(Operation *op) const final {
    // Analyze recursively if this is not a functional region operation, it
    // froms a separate functional scope.
    return !isa<FunctionalRegionOp>(op);
  }

  //===--------------------------------------------------------------------===//
  // Transformation Hooks
  //===--------------------------------------------------------------------===//

  /// Handle the given inlined terminator by replacing it with a new operation
  /// as necessary.
  void handleTerminator(Operation *op,
                        ArrayRef<Value> valuesToRepl) const final {
    // Only handle "test.return" here.
    auto returnOp = dyn_cast<TestReturnOp>(op);
    if (!returnOp)
      return;

    // Replace the values directly with the return operands.
    assert(returnOp.getNumOperands() == valuesToRepl.size());
    for (const auto &it : llvm::enumerate(returnOp.getOperands()))
      valuesToRepl[it.index()].replaceAllUsesWith(it.value());
  }

  /// Attempt to materialize a conversion for a type mismatch between a call
  /// from this dialect, and a callable region. This method should generate an
  /// operation that takes 'input' as the only operand, and produces a single
  /// result of 'resultType'. If a conversion can not be generated, nullptr
  /// should be returned.
  Operation *materializeCallConversion(OpBuilder &builder, Value input,
                                       Type resultType,
                                       Location conversionLoc) const final {
    // Only allow conversion for i16/i32 types.
    if (!(resultType.isSignlessInteger(16) ||
          resultType.isSignlessInteger(32)) ||
        !(input.getType().isSignlessInteger(16) ||
          input.getType().isSignlessInteger(32)))
      return nullptr;
    return builder.create<TestCastOp>(conversionLoc, resultType, input);
  }

  void processInlinedCallBlocks(
      Operation *call,
      iterator_range<Region::iterator> inlinedBlocks) const final {
    if (!isa<ConversionCallOp>(call))
      return;

    // Set attributed on all ops in the inlined blocks.
    for (Block &block : inlinedBlocks) {
      block.walk([&](Operation *op) {
        op->setAttr("inlined_conversion", UnitAttr::get(call->getContext()));
      });
    }
  }
};

struct TestReductionPatternInterface : public DialectReductionPatternInterface {
public:
  TestReductionPatternInterface(Dialect *dialect)
      : DialectReductionPatternInterface(dialect) {}

  void populateReductionPatterns(RewritePatternSet &patterns) const final {
    populateTestReductionPatterns(patterns);
  }
};

} // namespace

//===----------------------------------------------------------------------===//
// TestDialect
//===----------------------------------------------------------------------===//

static void testSideEffectOpGetEffect(
    Operation *op,
    SmallVectorImpl<SideEffects::EffectInstance<TestEffects::Effect>> &effects);

// This is the implementation of a dialect fallback for `TestEffectOpInterface`.
struct TestOpEffectInterfaceFallback
    : public TestEffectOpInterface::FallbackModel<
          TestOpEffectInterfaceFallback> {
  static bool classof(Operation *op) {
    bool isSupportedOp =
        op->getName().getStringRef() == "test.unregistered_side_effect_op";
    assert(isSupportedOp && "Unexpected dispatch");
    return isSupportedOp;
  }

  void
  getEffects(Operation *op,
             SmallVectorImpl<SideEffects::EffectInstance<TestEffects::Effect>>
                 &effects) const {
    testSideEffectOpGetEffect(op, effects);
  }
};

void TestDialect::initialize() {
  registerAttributes();
  registerTypes();
  addOperations<
#define GET_OP_LIST
#include "TestOps.cpp.inc"
      >();
  addInterfaces<TestOpAsmInterface, TestDialectFoldInterface,
                TestInlinerInterface, TestReductionPatternInterface>();
  allowUnknownOperations();

  // Instantiate our fallback op interface that we'll use on specific
  // unregistered op.
  fallbackEffectOpInterfaces = new TestOpEffectInterfaceFallback;
}
TestDialect::~TestDialect() {
  delete static_cast<TestOpEffectInterfaceFallback *>(
      fallbackEffectOpInterfaces);
}

Operation *TestDialect::materializeConstant(OpBuilder &builder, Attribute value,
                                            Type type, Location loc) {
  return builder.create<TestOpConstant>(loc, type, value);
}

::mlir::LogicalResult FormatInferType2Op::inferReturnTypes(
    ::mlir::MLIRContext *context, ::llvm::Optional<::mlir::Location> location,
    ::mlir::ValueRange operands, ::mlir::DictionaryAttr attributes,
    ::mlir::RegionRange regions,
    ::llvm::SmallVectorImpl<::mlir::Type> &inferredReturnTypes) {
  inferredReturnTypes.assign({::mlir::IntegerType::get(context, 16)});
  return ::mlir::success();
}

void *TestDialect::getRegisteredInterfaceForOp(TypeID typeID,
                                               OperationName opName) {
  if (opName.getIdentifier() == "test.unregistered_side_effect_op" &&
      typeID == TypeID::get<TestEffectOpInterface>())
    return fallbackEffectOpInterfaces;
  return nullptr;
}

LogicalResult TestDialect::verifyOperationAttribute(Operation *op,
                                                    NamedAttribute namedAttr) {
  if (namedAttr.getName() == "test.invalid_attr")
    return op->emitError() << "invalid to use 'test.invalid_attr'";
  return success();
}

LogicalResult TestDialect::verifyRegionArgAttribute(Operation *op,
                                                    unsigned regionIndex,
                                                    unsigned argIndex,
                                                    NamedAttribute namedAttr) {
  if (namedAttr.getName() == "test.invalid_attr")
    return op->emitError() << "invalid to use 'test.invalid_attr'";
  return success();
}

LogicalResult
TestDialect::verifyRegionResultAttribute(Operation *op, unsigned regionIndex,
                                         unsigned resultIndex,
                                         NamedAttribute namedAttr) {
  if (namedAttr.getName() == "test.invalid_attr")
    return op->emitError() << "invalid to use 'test.invalid_attr'";
  return success();
}

Optional<Dialect::ParseOpHook>
TestDialect::getParseOperationHook(StringRef opName) const {
  if (opName == "test.dialect_custom_printer") {
    return ParseOpHook{[](OpAsmParser &parser, OperationState &state) {
      return parser.parseKeyword("custom_format");
    }};
  }
  if (opName == "test.dialect_custom_format_fallback") {
    return ParseOpHook{[](OpAsmParser &parser, OperationState &state) {
      return parser.parseKeyword("custom_format_fallback");
    }};
  }
  return None;
}

llvm::unique_function<void(Operation *, OpAsmPrinter &)>
TestDialect::getOperationPrinter(Operation *op) const {
  StringRef opName = op->getName().getStringRef();
  if (opName == "test.dialect_custom_printer") {
    return [](Operation *op, OpAsmPrinter &printer) {
      printer.getStream() << " custom_format";
    };
  }
  if (opName == "test.dialect_custom_format_fallback") {
    return [](Operation *op, OpAsmPrinter &printer) {
      printer.getStream() << " custom_format_fallback";
    };
  }
  return {};
}

//===----------------------------------------------------------------------===//
// TestBranchOp
//===----------------------------------------------------------------------===//

Optional<MutableOperandRange>
TestBranchOp::getMutableSuccessorOperands(unsigned index) {
  assert(index == 0 && "invalid successor index");
  return getTargetOperandsMutable();
}

//===----------------------------------------------------------------------===//
// TestDialectCanonicalizerOp
//===----------------------------------------------------------------------===//

static LogicalResult
dialectCanonicalizationPattern(TestDialectCanonicalizerOp op,
                               PatternRewriter &rewriter) {
  rewriter.replaceOpWithNewOp<arith::ConstantOp>(
      op, rewriter.getI32IntegerAttr(42));
  return success();
}

void TestDialect::getCanonicalizationPatterns(
    RewritePatternSet &results) const {
  results.add(&dialectCanonicalizationPattern);
}

//===----------------------------------------------------------------------===//
// TestFoldToCallOp
//===----------------------------------------------------------------------===//

namespace {
struct FoldToCallOpPattern : public OpRewritePattern<FoldToCallOp> {
  using OpRewritePattern<FoldToCallOp>::OpRewritePattern;

  LogicalResult matchAndRewrite(FoldToCallOp op,
                                PatternRewriter &rewriter) const override {
    rewriter.replaceOpWithNewOp<CallOp>(op, TypeRange(), op.getCalleeAttr(),
                                        ValueRange());
    return success();
  }
};
} // namespace

void FoldToCallOp::getCanonicalizationPatterns(RewritePatternSet &results,
                                               MLIRContext *context) {
  results.add<FoldToCallOpPattern>(context);
}

//===----------------------------------------------------------------------===//
// Test Format* operations
//===----------------------------------------------------------------------===//

//===----------------------------------------------------------------------===//
// Parsing

static ParseResult parseCustomDirectiveOperands(
    OpAsmParser &parser, OpAsmParser::OperandType &operand,
    Optional<OpAsmParser::OperandType> &optOperand,
    SmallVectorImpl<OpAsmParser::OperandType> &varOperands) {
  if (parser.parseOperand(operand))
    return failure();
  if (succeeded(parser.parseOptionalComma())) {
    optOperand.emplace();
    if (parser.parseOperand(*optOperand))
      return failure();
  }
  if (parser.parseArrow() || parser.parseLParen() ||
      parser.parseOperandList(varOperands) || parser.parseRParen())
    return failure();
  return success();
}
static ParseResult
parseCustomDirectiveResults(OpAsmParser &parser, Type &operandType,
                            Type &optOperandType,
                            SmallVectorImpl<Type> &varOperandTypes) {
  if (parser.parseColon())
    return failure();

  if (parser.parseType(operandType))
    return failure();
  if (succeeded(parser.parseOptionalComma())) {
    if (parser.parseType(optOperandType))
      return failure();
  }
  if (parser.parseArrow() || parser.parseLParen() ||
      parser.parseTypeList(varOperandTypes) || parser.parseRParen())
    return failure();
  return success();
}
static ParseResult
parseCustomDirectiveWithTypeRefs(OpAsmParser &parser, Type operandType,
                                 Type optOperandType,
                                 const SmallVectorImpl<Type> &varOperandTypes) {
  if (parser.parseKeyword("type_refs_capture"))
    return failure();

  Type operandType2, optOperandType2;
  SmallVector<Type, 1> varOperandTypes2;
  if (parseCustomDirectiveResults(parser, operandType2, optOperandType2,
                                  varOperandTypes2))
    return failure();

  if (operandType != operandType2 || optOperandType != optOperandType2 ||
      varOperandTypes != varOperandTypes2)
    return failure();

  return success();
}
static ParseResult parseCustomDirectiveOperandsAndTypes(
    OpAsmParser &parser, OpAsmParser::OperandType &operand,
    Optional<OpAsmParser::OperandType> &optOperand,
    SmallVectorImpl<OpAsmParser::OperandType> &varOperands, Type &operandType,
    Type &optOperandType, SmallVectorImpl<Type> &varOperandTypes) {
  if (parseCustomDirectiveOperands(parser, operand, optOperand, varOperands) ||
      parseCustomDirectiveResults(parser, operandType, optOperandType,
                                  varOperandTypes))
    return failure();
  return success();
}
static ParseResult parseCustomDirectiveRegions(
    OpAsmParser &parser, Region &region,
    SmallVectorImpl<std::unique_ptr<Region>> &varRegions) {
  if (parser.parseRegion(region))
    return failure();
  if (failed(parser.parseOptionalComma()))
    return success();
  std::unique_ptr<Region> varRegion = std::make_unique<Region>();
  if (parser.parseRegion(*varRegion))
    return failure();
  varRegions.emplace_back(std::move(varRegion));
  return success();
}
static ParseResult
parseCustomDirectiveSuccessors(OpAsmParser &parser, Block *&successor,
                               SmallVectorImpl<Block *> &varSuccessors) {
  if (parser.parseSuccessor(successor))
    return failure();
  if (failed(parser.parseOptionalComma()))
    return success();
  Block *varSuccessor;
  if (parser.parseSuccessor(varSuccessor))
    return failure();
  varSuccessors.append(2, varSuccessor);
  return success();
}
static ParseResult parseCustomDirectiveAttributes(OpAsmParser &parser,
                                                  IntegerAttr &attr,
                                                  IntegerAttr &optAttr) {
  if (parser.parseAttribute(attr))
    return failure();
  if (succeeded(parser.parseOptionalComma())) {
    if (parser.parseAttribute(optAttr))
      return failure();
  }
  return success();
}

static ParseResult parseCustomDirectiveAttrDict(OpAsmParser &parser,
                                                NamedAttrList &attrs) {
  return parser.parseOptionalAttrDict(attrs);
}
static ParseResult parseCustomDirectiveOptionalOperandRef(
    OpAsmParser &parser, Optional<OpAsmParser::OperandType> &optOperand) {
  int64_t operandCount = 0;
  if (parser.parseInteger(operandCount))
    return failure();
  bool expectedOptionalOperand = operandCount == 0;
  return success(expectedOptionalOperand != optOperand.hasValue());
}

//===----------------------------------------------------------------------===//
// Printing

static void printCustomDirectiveOperands(OpAsmPrinter &printer, Operation *,
                                         Value operand, Value optOperand,
                                         OperandRange varOperands) {
  printer << operand;
  if (optOperand)
    printer << ", " << optOperand;
  printer << " -> (" << varOperands << ")";
}
static void printCustomDirectiveResults(OpAsmPrinter &printer, Operation *,
                                        Type operandType, Type optOperandType,
                                        TypeRange varOperandTypes) {
  printer << " : " << operandType;
  if (optOperandType)
    printer << ", " << optOperandType;
  printer << " -> (" << varOperandTypes << ")";
}
static void printCustomDirectiveWithTypeRefs(OpAsmPrinter &printer,
                                             Operation *op, Type operandType,
                                             Type optOperandType,
                                             TypeRange varOperandTypes) {
  printer << " type_refs_capture ";
  printCustomDirectiveResults(printer, op, operandType, optOperandType,
                              varOperandTypes);
}
static void printCustomDirectiveOperandsAndTypes(
    OpAsmPrinter &printer, Operation *op, Value operand, Value optOperand,
    OperandRange varOperands, Type operandType, Type optOperandType,
    TypeRange varOperandTypes) {
  printCustomDirectiveOperands(printer, op, operand, optOperand, varOperands);
  printCustomDirectiveResults(printer, op, operandType, optOperandType,
                              varOperandTypes);
}
static void printCustomDirectiveRegions(OpAsmPrinter &printer, Operation *,
                                        Region &region,
                                        MutableArrayRef<Region> varRegions) {
  printer.printRegion(region);
  if (!varRegions.empty()) {
    printer << ", ";
    for (Region &region : varRegions)
      printer.printRegion(region);
  }
}
static void printCustomDirectiveSuccessors(OpAsmPrinter &printer, Operation *,
                                           Block *successor,
                                           SuccessorRange varSuccessors) {
  printer << successor;
  if (!varSuccessors.empty())
    printer << ", " << varSuccessors.front();
}
static void printCustomDirectiveAttributes(OpAsmPrinter &printer, Operation *,
                                           Attribute attribute,
                                           Attribute optAttribute) {
  printer << attribute;
  if (optAttribute)
    printer << ", " << optAttribute;
}

static void printCustomDirectiveAttrDict(OpAsmPrinter &printer, Operation *op,
                                         DictionaryAttr attrs) {
  printer.printOptionalAttrDict(attrs.getValue());
}

static void printCustomDirectiveOptionalOperandRef(OpAsmPrinter &printer,
                                                   Operation *op,
                                                   Value optOperand) {
  printer << (optOperand ? "1" : "0");
}

//===----------------------------------------------------------------------===//
// Test IsolatedRegionOp - parse passthrough region arguments.
//===----------------------------------------------------------------------===//

static ParseResult parseIsolatedRegionOp(OpAsmParser &parser,
                                         OperationState &result) {
  OpAsmParser::OperandType argInfo;
  Type argType = parser.getBuilder().getIndexType();

  // Parse the input operand.
  if (parser.parseOperand(argInfo) ||
      parser.resolveOperand(argInfo, argType, result.operands))
    return failure();

  // Parse the body region, and reuse the operand info as the argument info.
  Region *body = result.addRegion();
  return parser.parseRegion(*body, argInfo, argType, /*argLocations=*/{},
                            /*enableNameShadowing=*/true);
}

static void print(OpAsmPrinter &p, IsolatedRegionOp op) {
  p << "test.isolated_region ";
  p.printOperand(op.getOperand());
  p.shadowRegionArgs(op.getRegion(), op.getOperand());
  p << ' ';
  p.printRegion(op.getRegion(), /*printEntryBlockArgs=*/false);
}

//===----------------------------------------------------------------------===//
// Test SSACFGRegionOp
//===----------------------------------------------------------------------===//

RegionKind SSACFGRegionOp::getRegionKind(unsigned index) {
  return RegionKind::SSACFG;
}

//===----------------------------------------------------------------------===//
// Test GraphRegionOp
//===----------------------------------------------------------------------===//

static ParseResult parseGraphRegionOp(OpAsmParser &parser,
                                      OperationState &result) {
  // Parse the body region, and reuse the operand info as the argument info.
  Region *body = result.addRegion();
  return parser.parseRegion(*body, /*arguments=*/{}, /*argTypes=*/{});
}

static void print(OpAsmPrinter &p, GraphRegionOp op) {
  p << "test.graph_region ";
  p.printRegion(op.getRegion(), /*printEntryBlockArgs=*/false);
}

RegionKind GraphRegionOp::getRegionKind(unsigned index) {
  return RegionKind::Graph;
}

//===----------------------------------------------------------------------===//
// Test AffineScopeOp
//===----------------------------------------------------------------------===//

static ParseResult parseAffineScopeOp(OpAsmParser &parser,
                                      OperationState &result) {
  // Parse the body region, and reuse the operand info as the argument info.
  Region *body = result.addRegion();
  return parser.parseRegion(*body, /*arguments=*/{}, /*argTypes=*/{});
}

static void print(OpAsmPrinter &p, AffineScopeOp op) {
  p << "test.affine_scope ";
  p.printRegion(op.getRegion(), /*printEntryBlockArgs=*/false);
}

//===----------------------------------------------------------------------===//
// Test parser.
//===----------------------------------------------------------------------===//

static ParseResult parseParseIntegerLiteralOp(OpAsmParser &parser,
                                              OperationState &result) {
  if (parser.parseOptionalColon())
    return success();
  uint64_t numResults;
  if (parser.parseInteger(numResults))
    return failure();

  IndexType type = parser.getBuilder().getIndexType();
  for (unsigned i = 0; i < numResults; ++i)
    result.addTypes(type);
  return success();
}

static void print(OpAsmPrinter &p, ParseIntegerLiteralOp op) {
  if (unsigned numResults = op->getNumResults())
    p << " : " << numResults;
}

static ParseResult parseParseWrappedKeywordOp(OpAsmParser &parser,
                                              OperationState &result) {
  StringRef keyword;
  if (parser.parseKeyword(&keyword))
    return failure();
  result.addAttribute("keyword", parser.getBuilder().getStringAttr(keyword));
  return success();
}

static void print(OpAsmPrinter &p, ParseWrappedKeywordOp op) {
  p << " " << op.getKeyword();
}

//===----------------------------------------------------------------------===//
// Test WrapRegionOp - wrapping op exercising `parseGenericOperation()`.

static ParseResult parseWrappingRegionOp(OpAsmParser &parser,
                                         OperationState &result) {
  if (parser.parseKeyword("wraps"))
    return failure();

  // Parse the wrapped op in a region
  Region &body = *result.addRegion();
  body.push_back(new Block);
  Block &block = body.back();
  Operation *wrappedOp = parser.parseGenericOperation(&block, block.begin());
  if (!wrappedOp)
    return failure();

  // Create a return terminator in the inner region, pass as operand to the
  // terminator the returned values from the wrapped operation.
  SmallVector<Value, 8> returnOperands(wrappedOp->getResults());
  OpBuilder builder(parser.getContext());
  builder.setInsertionPointToEnd(&block);
  builder.create<TestReturnOp>(wrappedOp->getLoc(), returnOperands);

  // Get the results type for the wrapping op from the terminator operands.
  Operation &returnOp = body.back().back();
  result.types.append(returnOp.operand_type_begin(),
                      returnOp.operand_type_end());

  // Use the location of the wrapped op for the "test.wrapping_region" op.
  result.location = wrappedOp->getLoc();

  return success();
}

static void print(OpAsmPrinter &p, WrappingRegionOp op) {
  p << " wraps ";
  p.printGenericOp(&op.getRegion().front().front());
}

//===----------------------------------------------------------------------===//
// Test PrettyPrintedRegionOp -  exercising the following parser APIs
//   parseGenericOperationAfterOpName
//   parseCustomOperationName
//===----------------------------------------------------------------------===//

static ParseResult parsePrettyPrintedRegionOp(OpAsmParser &parser,
                                              OperationState &result) {

  SMLoc loc = parser.getCurrentLocation();
  Location currLocation = parser.getEncodedSourceLoc(loc);

  // Parse the operands.
  SmallVector<OpAsmParser::OperandType, 2> operands;
  if (parser.parseOperandList(operands))
    return failure();

  // Check if we are parsing the pretty-printed version
  //  test.pretty_printed_region start <inner-op> end : <functional-type>
  // Else fallback to parsing the "non pretty-printed" version.
  if (!succeeded(parser.parseOptionalKeyword("start")))
    return parser.parseGenericOperationAfterOpName(
        result, llvm::makeArrayRef(operands));

  FailureOr<OperationName> parseOpNameInfo = parser.parseCustomOperationName();
  if (failed(parseOpNameInfo))
    return failure();

  StringRef innerOpName = parseOpNameInfo->getStringRef();

  FunctionType opFntype;
  Optional<Location> explicitLoc;
  if (parser.parseKeyword("end") || parser.parseColon() ||
      parser.parseType(opFntype) ||
      parser.parseOptionalLocationSpecifier(explicitLoc))
    return failure();

  // If location of the op is explicitly provided, then use it; Else use
  // the parser's current location.
  Location opLoc = explicitLoc.getValueOr(currLocation);

  // Derive the SSA-values for op's operands.
  if (parser.resolveOperands(operands, opFntype.getInputs(), loc,
                             result.operands))
    return failure();

  // Add a region for op.
  Region &region = *result.addRegion();

  // Create a basic-block inside op's region.
  Block &block = region.emplaceBlock();

  // Create and insert an "inner-op" operation in the block.
  // Just for testing purposes, we can assume that inner op is a binary op with
  // result and operand types all same as the test-op's first operand.
  Type innerOpType = opFntype.getInput(0);
  Value lhs = block.addArgument(innerOpType, opLoc);
  Value rhs = block.addArgument(innerOpType, opLoc);

  OpBuilder builder(parser.getBuilder().getContext());
  builder.setInsertionPointToStart(&block);

  OperationState innerOpState(opLoc, innerOpName);
  innerOpState.operands.push_back(lhs);
  innerOpState.operands.push_back(rhs);
  innerOpState.addTypes(innerOpType);

  Operation *innerOp = builder.createOperation(innerOpState);

  // Insert a return statement in the block returning the inner-op's result.
  builder.create<TestReturnOp>(innerOp->getLoc(), innerOp->getResults());

  // Populate the op operation-state with result-type and location.
  result.addTypes(opFntype.getResults());
  result.location = innerOp->getLoc();

  return success();
}

static void print(OpAsmPrinter &p, PrettyPrintedRegionOp op) {
  p << ' ';
  p.printOperands(op.getOperands());

  Operation &innerOp = op.getRegion().front().front();
  // Assuming that region has a single non-terminator inner-op, if the inner-op
  // meets some criteria (which in this case is a simple one  based on the name
  // of inner-op), then we can print the entire region in a succinct way.
  // Here we assume that the prototype of "special.op" can be trivially derived
  // while parsing it back.
  if (innerOp.getName().getStringRef().equals("special.op")) {
    p << " start special.op end";
  } else {
    p << " (";
    p.printRegion(op.getRegion());
    p << ")";
  }

  p << " : ";
  p.printFunctionalType(op);
}

//===----------------------------------------------------------------------===//
// Test PolyForOp - parse list of region arguments.
//===----------------------------------------------------------------------===//

static ParseResult parsePolyForOp(OpAsmParser &parser, OperationState &result) {
  SmallVector<OpAsmParser::OperandType, 4> ivsInfo;
  // Parse list of region arguments without a delimiter.
  if (parser.parseRegionArgumentList(ivsInfo))
    return failure();

  // Parse the body region.
  Region *body = result.addRegion();
  auto &builder = parser.getBuilder();
  SmallVector<Type, 4> argTypes(ivsInfo.size(), builder.getIndexType());
  return parser.parseRegion(*body, ivsInfo, argTypes);
}

void PolyForOp::getAsmBlockArgumentNames(Region &region,
                                         OpAsmSetValueNameFn setNameFn) {
  auto arrayAttr = getOperation()->getAttrOfType<ArrayAttr>("arg_names");
  if (!arrayAttr)
    return;
  auto args = getRegion().front().getArguments();
  auto e = std::min(arrayAttr.size(), args.size());
  for (unsigned i = 0; i < e; ++i) {
    if (auto strAttr = arrayAttr[i].dyn_cast<StringAttr>())
      setNameFn(args[i], strAttr.getValue());
  }
}

//===----------------------------------------------------------------------===//
// Test removing op with inner ops.
//===----------------------------------------------------------------------===//

namespace {
struct TestRemoveOpWithInnerOps
    : public OpRewritePattern<TestOpWithRegionPattern> {
  using OpRewritePattern<TestOpWithRegionPattern>::OpRewritePattern;

  void initialize() { setDebugName("TestRemoveOpWithInnerOps"); }

  LogicalResult matchAndRewrite(TestOpWithRegionPattern op,
                                PatternRewriter &rewriter) const override {
    rewriter.eraseOp(op);
    return success();
  }
};
} // namespace

void TestOpWithRegionPattern::getCanonicalizationPatterns(
    RewritePatternSet &results, MLIRContext *context) {
  results.add<TestRemoveOpWithInnerOps>(context);
}

OpFoldResult TestOpWithRegionFold::fold(ArrayRef<Attribute> operands) {
  return getOperand();
}

OpFoldResult TestOpConstant::fold(ArrayRef<Attribute> operands) {
  return getValue();
}

LogicalResult TestOpWithVariadicResultsAndFolder::fold(
    ArrayRef<Attribute> operands, SmallVectorImpl<OpFoldResult> &results) {
  for (Value input : this->getOperands()) {
    results.push_back(input);
  }
  return success();
}

OpFoldResult TestOpInPlaceFold::fold(ArrayRef<Attribute> operands) {
  assert(operands.size() == 1);
  if (operands.front()) {
    (*this)->setAttr("attr", operands.front());
    return getResult();
  }
  return {};
}

OpFoldResult TestPassthroughFold::fold(ArrayRef<Attribute> operands) {
  return getOperand();
}

LogicalResult OpWithInferTypeInterfaceOp::inferReturnTypes(
    MLIRContext *, Optional<Location> location, ValueRange operands,
    DictionaryAttr attributes, RegionRange regions,
    SmallVectorImpl<Type> &inferredReturnTypes) {
  if (operands[0].getType() != operands[1].getType()) {
    return emitOptionalError(location, "operand type mismatch ",
                             operands[0].getType(), " vs ",
                             operands[1].getType());
  }
  inferredReturnTypes.assign({operands[0].getType()});
  return success();
}

LogicalResult OpWithShapedTypeInferTypeInterfaceOp::inferReturnTypeComponents(
    MLIRContext *context, Optional<Location> location, ValueShapeRange operands,
    DictionaryAttr attributes, RegionRange regions,
    SmallVectorImpl<ShapedTypeComponents> &inferredReturnShapes) {
  // Create return type consisting of the last element of the first operand.
  auto operandType = operands.front().getType();
  auto sval = operandType.dyn_cast<ShapedType>();
  if (!sval) {
    return emitOptionalError(location, "only shaped type operands allowed");
  }
  int64_t dim =
      sval.hasRank() ? sval.getShape().front() : ShapedType::kDynamicSize;
  auto type = IntegerType::get(context, 17);
  inferredReturnShapes.push_back(ShapedTypeComponents({dim}, type));
  return success();
}

LogicalResult OpWithShapedTypeInferTypeInterfaceOp::reifyReturnTypeShapes(
    OpBuilder &builder, ValueRange operands,
    llvm::SmallVectorImpl<Value> &shapes) {
  shapes = SmallVector<Value, 1>{
      builder.createOrFold<tensor::DimOp>(getLoc(), operands.front(), 0)};
  return success();
}

LogicalResult OpWithResultShapeInterfaceOp::reifyReturnTypeShapes(
    OpBuilder &builder, ValueRange operands,
    llvm::SmallVectorImpl<Value> &shapes) {
  Location loc = getLoc();
  shapes.reserve(operands.size());
  for (Value operand : llvm::reverse(operands)) {
    auto rank = operand.getType().cast<RankedTensorType>().getRank();
    auto currShape = llvm::to_vector<4>(
        llvm::map_range(llvm::seq<int64_t>(0, rank), [&](int64_t dim) -> Value {
          return builder.createOrFold<tensor::DimOp>(loc, operand, dim);
        }));
    shapes.push_back(builder.create<tensor::FromElementsOp>(
        getLoc(), RankedTensorType::get({rank}, builder.getIndexType()),
        currShape));
  }
  return success();
}

LogicalResult OpWithResultShapePerDimInterfaceOp::reifyResultShapes(
    OpBuilder &builder, ReifiedRankedShapedTypeDims &shapes) {
  Location loc = getLoc();
  shapes.reserve(getNumOperands());
  for (Value operand : llvm::reverse(getOperands())) {
    auto currShape = llvm::to_vector<4>(llvm::map_range(
        llvm::seq<int64_t>(
            0, operand.getType().cast<RankedTensorType>().getRank()),
        [&](int64_t dim) -> Value {
          return builder.createOrFold<tensor::DimOp>(loc, operand, dim);
        }));
    shapes.emplace_back(std::move(currShape));
  }
  return success();
}

//===----------------------------------------------------------------------===//
// Test SideEffect interfaces
//===----------------------------------------------------------------------===//

namespace {
/// A test resource for side effects.
struct TestResource : public SideEffects::Resource::Base<TestResource> {
  StringRef getName() final { return "<Test>"; }
};
} // namespace

static void testSideEffectOpGetEffect(
    Operation *op,
    SmallVectorImpl<SideEffects::EffectInstance<TestEffects::Effect>>
        &effects) {
  auto effectsAttr = op->getAttrOfType<AffineMapAttr>("effect_parameter");
  if (!effectsAttr)
    return;

  effects.emplace_back(TestEffects::Concrete::get(), effectsAttr);
}

void SideEffectOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  // Check for an effects attribute on the op instance.
  ArrayAttr effectsAttr = (*this)->getAttrOfType<ArrayAttr>("effects");
  if (!effectsAttr)
    return;

  // If there is one, it is an array of dictionary attributes that hold
  // information on the effects of this operation.
  for (Attribute element : effectsAttr) {
    DictionaryAttr effectElement = element.cast<DictionaryAttr>();

    // Get the specific memory effect.
    MemoryEffects::Effect *effect =
        StringSwitch<MemoryEffects::Effect *>(
            effectElement.get("effect").cast<StringAttr>().getValue())
            .Case("allocate", MemoryEffects::Allocate::get())
            .Case("free", MemoryEffects::Free::get())
            .Case("read", MemoryEffects::Read::get())
            .Case("write", MemoryEffects::Write::get());

    // Check for a non-default resource to use.
    SideEffects::Resource *resource = SideEffects::DefaultResource::get();
    if (effectElement.get("test_resource"))
      resource = TestResource::get();

    // Check for a result to affect.
    if (effectElement.get("on_result"))
      effects.emplace_back(effect, getResult(), resource);
    else if (Attribute ref = effectElement.get("on_reference"))
      effects.emplace_back(effect, ref.cast<SymbolRefAttr>(), resource);
    else
      effects.emplace_back(effect, resource);
  }
}

void SideEffectOp::getEffects(
    SmallVectorImpl<TestEffects::EffectInstance> &effects) {
  testSideEffectOpGetEffect(getOperation(), effects);
}

//===----------------------------------------------------------------------===//
// StringAttrPrettyNameOp
//===----------------------------------------------------------------------===//

// This op has fancy handling of its SSA result name.
static ParseResult parseStringAttrPrettyNameOp(OpAsmParser &parser,
                                               OperationState &result) {
  // Add the result types.
  for (size_t i = 0, e = parser.getNumResults(); i != e; ++i)
    result.addTypes(parser.getBuilder().getIntegerType(32));

  if (parser.parseOptionalAttrDictWithKeyword(result.attributes))
    return failure();

  // If the attribute dictionary contains no 'names' attribute, infer it from
  // the SSA name (if specified).
  bool hadNames = llvm::any_of(result.attributes, [](NamedAttribute attr) {
    return attr.getName() == "names";
  });

  // If there was no name specified, check to see if there was a useful name
  // specified in the asm file.
  if (hadNames || parser.getNumResults() == 0)
    return success();

  SmallVector<StringRef, 4> names;
  auto *context = result.getContext();

  for (size_t i = 0, e = parser.getNumResults(); i != e; ++i) {
    auto resultName = parser.getResultName(i);
    StringRef nameStr;
    if (!resultName.first.empty() && !isdigit(resultName.first[0]))
      nameStr = resultName.first;

    names.push_back(nameStr);
  }

  auto namesAttr = parser.getBuilder().getStrArrayAttr(names);
  result.attributes.push_back({StringAttr::get(context, "names"), namesAttr});
  return success();
}

static void print(OpAsmPrinter &p, StringAttrPrettyNameOp op) {
  // Note that we only need to print the "name" attribute if the asmprinter
  // result name disagrees with it.  This can happen in strange cases, e.g.
  // when there are conflicts.
  bool namesDisagree = op.getNames().size() != op.getNumResults();

  SmallString<32> resultNameStr;
  for (size_t i = 0, e = op.getNumResults(); i != e && !namesDisagree; ++i) {
    resultNameStr.clear();
    llvm::raw_svector_ostream tmpStream(resultNameStr);
    p.printOperand(op.getResult(i), tmpStream);

    auto expectedName = op.getNames()[i].dyn_cast<StringAttr>();
    if (!expectedName ||
        tmpStream.str().drop_front() != expectedName.getValue()) {
      namesDisagree = true;
    }
  }

  if (namesDisagree)
    p.printOptionalAttrDictWithKeyword(op->getAttrs());
  else
    p.printOptionalAttrDictWithKeyword(op->getAttrs(), {"names"});
}

// We set the SSA name in the asm syntax to the contents of the name
// attribute.
void StringAttrPrettyNameOp::getAsmResultNames(
    function_ref<void(Value, StringRef)> setNameFn) {

  auto value = getNames();
  for (size_t i = 0, e = value.size(); i != e; ++i)
    if (auto str = value[i].dyn_cast<StringAttr>())
      if (!str.getValue().empty())
        setNameFn(getResult(i), str.getValue());
}

//===----------------------------------------------------------------------===//
// ResultTypeWithTraitOp
//===----------------------------------------------------------------------===//

LogicalResult ResultTypeWithTraitOp::verify() {
  if ((*this)->getResultTypes()[0].hasTrait<TypeTrait::TestTypeTrait>())
    return success();
  return emitError("result type should have trait 'TestTypeTrait'");
}

//===----------------------------------------------------------------------===//
// AttrWithTraitOp
//===----------------------------------------------------------------------===//

LogicalResult AttrWithTraitOp::verify() {
  if (getAttr().hasTrait<AttributeTrait::TestAttrTrait>())
    return success();
  return emitError("'attr' attribute should have trait 'TestAttrTrait'");
}

//===----------------------------------------------------------------------===//
// RegionIfOp
//===----------------------------------------------------------------------===//

static void print(OpAsmPrinter &p, RegionIfOp op) {
  p << " ";
  p.printOperands(op.getOperands());
  p << ": " << op.getOperandTypes();
  p.printArrowTypeList(op.getResultTypes());
  p << " then ";
  p.printRegion(op.getThenRegion(),
                /*printEntryBlockArgs=*/true,
                /*printBlockTerminators=*/true);
  p << " else ";
  p.printRegion(op.getElseRegion(),
                /*printEntryBlockArgs=*/true,
                /*printBlockTerminators=*/true);
  p << " join ";
  p.printRegion(op.getJoinRegion(),
                /*printEntryBlockArgs=*/true,
                /*printBlockTerminators=*/true);
}

static ParseResult parseRegionIfOp(OpAsmParser &parser,
                                   OperationState &result) {
  SmallVector<OpAsmParser::OperandType, 2> operandInfos;
  SmallVector<Type, 2> operandTypes;

  result.regions.reserve(3);
  Region *thenRegion = result.addRegion();
  Region *elseRegion = result.addRegion();
  Region *joinRegion = result.addRegion();

  // Parse operand, type and arrow type lists.
  if (parser.parseOperandList(operandInfos) ||
      parser.parseColonTypeList(operandTypes) ||
      parser.parseArrowTypeList(result.types))
    return failure();

  // Parse all attached regions.
  if (parser.parseKeyword("then") || parser.parseRegion(*thenRegion, {}, {}) ||
      parser.parseKeyword("else") || parser.parseRegion(*elseRegion, {}, {}) ||
      parser.parseKeyword("join") || parser.parseRegion(*joinRegion, {}, {}))
    return failure();

  return parser.resolveOperands(operandInfos, operandTypes,
                                parser.getCurrentLocation(), result.operands);
}

OperandRange RegionIfOp::getSuccessorEntryOperands(unsigned index) {
  assert(index < 2 && "invalid region index");
  return getOperands();
}

void RegionIfOp::getSuccessorRegions(
    Optional<unsigned> index, ArrayRef<Attribute> operands,
    SmallVectorImpl<RegionSuccessor> &regions) {
  // We always branch to the join region.
  if (index.hasValue()) {
    if (index.getValue() < 2)
      regions.push_back(RegionSuccessor(&getJoinRegion(), getJoinArgs()));
    else
      regions.push_back(RegionSuccessor(getResults()));
    return;
  }

  // The then and else regions are the entry regions of this op.
  regions.push_back(RegionSuccessor(&getThenRegion(), getThenArgs()));
  regions.push_back(RegionSuccessor(&getElseRegion(), getElseArgs()));
}

void RegionIfOp::getRegionInvocationBounds(
    ArrayRef<Attribute> operands,
    SmallVectorImpl<InvocationBounds> &invocationBounds) {
  // Each region is invoked at most once.
  invocationBounds.assign(/*NumElts=*/3, /*Elt=*/{0, 1});
}

//===----------------------------------------------------------------------===//
// AnyCondOp
//===----------------------------------------------------------------------===//

void AnyCondOp::getSuccessorRegions(Optional<unsigned> index,
                                    ArrayRef<Attribute> operands,
                                    SmallVectorImpl<RegionSuccessor> &regions) {
  // The parent op branches into the only region, and the region branches back
  // to the parent op.
  if (index)
    regions.emplace_back(&getRegion());
  else
    regions.emplace_back(getResults());
}

void AnyCondOp::getRegionInvocationBounds(
    ArrayRef<Attribute> operands,
    SmallVectorImpl<InvocationBounds> &invocationBounds) {
  invocationBounds.emplace_back(1, 1);
}

//===----------------------------------------------------------------------===//
// SingleNoTerminatorCustomAsmOp
//===----------------------------------------------------------------------===//

static ParseResult parseSingleNoTerminatorCustomAsmOp(OpAsmParser &parser,
                                                      OperationState &state) {
  Region *body = state.addRegion();
  if (parser.parseRegion(*body, /*arguments=*/{}, /*argTypes=*/{}))
    return failure();
  return success();
}

static void print(SingleNoTerminatorCustomAsmOp op, OpAsmPrinter &printer) {
  printer.printRegion(
      op.getRegion(), /*printEntryBlockArgs=*/false,
      // This op has a single block without terminators. But explicitly mark
      // as not printing block terminators for testing.
      /*printBlockTerminators=*/false);
}

#include "TestOpEnums.cpp.inc"
#include "TestOpInterfaces.cpp.inc"
#include "TestOpStructs.cpp.inc"
#include "TestTypeInterfaces.cpp.inc"

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