//===- 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 "TestTypes.h"
#include "mlir/Dialect/StandardOps/IR/Ops.h"
#include "mlir/IR/DialectImplementation.h"
#include "mlir/IR/Function.h"
#include "mlir/IR/Module.h"
#include "mlir/IR/PatternMatch.h"
#include "mlir/IR/TypeUtilities.h"
#include "mlir/Transforms/FoldUtils.h"
#include "mlir/Transforms/InliningUtils.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/StringSwitch.h"

using namespace mlir;

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

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

namespace {

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

  void getAsmResultNames(Operation *op,
                         OpAsmSetValueNameFn setNameFn) const final {
    if (auto asmOp = dyn_cast<AsmDialectInterfaceOp>(op))
      setNameFn(asmOp, "result");
  }

  void getAsmBlockArgumentNames(Block *block,
                                OpAsmSetValueNameFn setNameFn) const final {
    auto op = block->getParentOp();
    auto arrayAttr = op->getAttrOfType<ArrayAttr>("arg_names");
    if (!arrayAttr)
      return;
    auto args = block->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());
    }
  }
};

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(Region *, Region *, BlockAndValueMapping &) const final {
    // Inlining into test dialect regions is legal.
    return true;
  }
  bool isLegalToInline(Operation *, Region *,
                       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);
  }
};
} // end anonymous namespace

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

void TestDialect::initialize() {
  addOperations<
#define GET_OP_LIST
#include "TestOps.cpp.inc"
      >();
  addInterfaces<TestOpAsmInterface, TestDialectFoldInterface,
                TestInlinerInterface>();
  addTypes<TestType, TestRecursiveType>();
  allowUnknownOperations();
}

static Type parseTestType(DialectAsmParser &parser,
                          llvm::SetVector<Type> &stack) {
  StringRef typeTag;
  if (failed(parser.parseKeyword(&typeTag)))
    return Type();

  if (typeTag == "test_type")
    return TestType::get(parser.getBuilder().getContext());

  if (typeTag != "test_rec")
    return Type();

  StringRef name;
  if (parser.parseLess() || parser.parseKeyword(&name))
    return Type();
  auto rec = TestRecursiveType::get(parser.getBuilder().getContext(), name);

  // If this type already has been parsed above in the stack, expect just the
  // name.
  if (stack.contains(rec)) {
    if (failed(parser.parseGreater()))
      return Type();
    return rec;
  }

  // Otherwise, parse the body and update the type.
  if (failed(parser.parseComma()))
    return Type();
  stack.insert(rec);
  Type subtype = parseTestType(parser, stack);
  stack.pop_back();
  if (!subtype || failed(parser.parseGreater()) || failed(rec.setBody(subtype)))
    return Type();

  return rec;
}

Type TestDialect::parseType(DialectAsmParser &parser) const {
  llvm::SetVector<Type> stack;
  return parseTestType(parser, stack);
}

static void printTestType(Type type, DialectAsmPrinter &printer,
                          llvm::SetVector<Type> &stack) {
  if (type.isa<TestType>()) {
    printer << "test_type";
    return;
  }

  auto rec = type.cast<TestRecursiveType>();
  printer << "test_rec<" << rec.getName();
  if (!stack.contains(rec)) {
    printer << ", ";
    stack.insert(rec);
    printTestType(rec.getBody(), printer, stack);
    stack.pop_back();
  }
  printer << ">";
}

void TestDialect::printType(Type type, DialectAsmPrinter &printer) const {
  llvm::SetVector<Type> stack;
  printTestType(type, printer, stack);
}

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

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

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

//===----------------------------------------------------------------------===//
// 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.calleeAttr(),
                                        ValueRange());
    return success();
  }
};
} // end anonymous namespace

void FoldToCallOp::getCanonicalizationPatterns(
    OwningRewritePatternList &results, MLIRContext *context) {
  results.insert<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();
}

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

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

//===----------------------------------------------------------------------===//
// 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,
                            /*enableNameShadowing=*/true);
}

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

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

static ParseResult parseWrappedKeywordOp(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, WrappedKeywordOp op) {
  p << WrappedKeywordOp::getOperationName() << " " << op.keyword();
}

//===----------------------------------------------------------------------===//
// 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 *wrapped_op = parser.parseGenericOperation(&block, block.begin());
  if (!wrapped_op)
    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> return_operands(wrapped_op->getResults());
  OpBuilder builder(parser.getBuilder().getContext());
  builder.setInsertionPointToEnd(&block);
  builder.create<TestReturnOp>(wrapped_op->getLoc(), return_operands);

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

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

  return success();
}

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

//===----------------------------------------------------------------------===//
// 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);
}

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

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

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

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

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

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

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

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, ValueRange operands,
    DictionaryAttr attributes, RegionRange regions,
    SmallVectorImpl<ShapedTypeComponents> &inferredReturnShapes) {
  // Create return type consisting of the last element of the first operand.
  auto operandType = *operands.getTypes().begin();
  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(17, context);
  inferredReturnShapes.push_back(ShapedTypeComponents({dim}, type));
  return success();
}

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

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

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

void SideEffectOp::getEffects(
    SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
  // Check for an effects attribute on the op instance.
  ArrayAttr effectsAttr = 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 =
        llvm::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 result to affect.
    Value value;
    if (effectElement.get("on_result"))
      value = getResult();

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

    effects.emplace_back(effect, value, resource);
  }
}

//===----------------------------------------------------------------------===//
// 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.first == "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({Identifier::get("names", context), namesAttr});
  return success();
}

static void print(OpAsmPrinter &p, StringAttrPrettyNameOp op) {
  p << "test.string_attr_pretty_name";

  // 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.names().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.names()[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 = names();
  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());
}

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

static void print(OpAsmPrinter &p, RegionIfOp op) {
  p << RegionIfOp::getOperationName() << " ";
  p.printOperands(op.getOperands());
  p << ": " << op.getOperandTypes();
  p.printArrowTypeList(op.getResultTypes());
  p << " then";
  p.printRegion(op.thenRegion(),
                /*printEntryBlockArgs=*/true,
                /*printBlockTerminators=*/true);
  p << " else";
  p.printRegion(op.elseRegion(),
                /*printEntryBlockArgs=*/true,
                /*printBlockTerminators=*/true);
  p << " join";
  p.printRegion(op.joinRegion(),
                /*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(&joinRegion(), getJoinArgs()));
    else
      regions.push_back(RegionSuccessor(getResults()));
    return;
  }

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

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

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