FIRRTLTypes.cpp

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//===- FIRRTLTypes.cpp - Implement the FIRRTL dialect type system ---------===//
//
// 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 implement the FIRRTL dialect type system.
//
//===----------------------------------------------------------------------===//
 
#include "circt/Dialect/FIRRTL/FIRRTLTypes.h"
#include "circt/Dialect/FIRRTL/FIRRTLOps.h"
#include "circt/Dialect/FIRRTL/FIRRTLUtils.h"
#include "circt/Dialect/HW/HWTypeInterfaces.h"
#include "mlir/IR/DialectImplementation.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/ADT/TypeSwitch.h"
 
using namespace circt;
using namespace firrtl;
 
using mlir::OptionalParseResult;
using mlir::TypeStorageAllocator;
 
//===----------------------------------------------------------------------===//
// TableGen generated logic.
//===----------------------------------------------------------------------===//
 
// Provide the autogenerated implementation for types.
#define GET_TYPEDEF_CLASSES
#include "circt/Dialect/FIRRTL/FIRRTLTypes.cpp.inc"
 
//===----------------------------------------------------------------------===//
// Type Printing
//===----------------------------------------------------------------------===//
 
// NOLINTBEGIN(misc-no-recursion)
/// Print a type with a custom printer implementation.
///
/// This only prints a subset of all types in the dialect. Use `printNestedType`
/// instead, which will call this function in turn, as appropriate.
static LogicalResult customTypePrinter(Type type, AsmPrinter &os) {
  if (isConst(type))
    os << "const.";
 
  auto printWidthQualifier = [&](std::optional<int32_t> width) {
    if (width)
      os << '<' << *width << '>';
  };
  bool anyFailed = false;
  TypeSwitch<Type>(type)
      .Case<ClockType>([&](auto) { os << "clock"; })
      .Case<ResetType>([&](auto) { os << "reset"; })
      .Case<AsyncResetType>([&](auto) { os << "asyncreset"; })
      .Case<SIntType>([&](auto sIntType) {
        os << "sint";
        printWidthQualifier(sIntType.getWidth());
      })
      .Case<UIntType>([&](auto uIntType) {
        os << "uint";
        printWidthQualifier(uIntType.getWidth());
      })
      .Case<AnalogType>([&](auto analogType) {
        os << "analog";
        printWidthQualifier(analogType.getWidth());
      })
      .Case<BundleType, OpenBundleType>([&](auto bundleType) {
        if (firrtl::type_isa<OpenBundleType>(bundleType))
          os << "open";
        os << "bundle<";
        llvm::interleaveComma(bundleType, os, [&](auto element) {
          StringRef fieldName = element.name.getValue();
          bool isLiteralIdentifier =
              !fieldName.empty() && llvm::isDigit(fieldName.front());
          if (isLiteralIdentifier)
            os << "\"";
          os << element.name.getValue();
          if (isLiteralIdentifier)
            os << "\"";
          if (element.isFlip)
            os << " flip";
          os << ": ";
          printNestedType(element.type, os);
        });
        os << '>';
      })
      .Case<FEnumType>([&](auto fenumType) {
        os << "enum<";
        std::optional<APInt> previous;
        llvm::interleaveComma(
            fenumType, os, [&](FEnumType::EnumElement element) {
              // Print the variant name.
              os << element.name.getValue();
 
              // Print the variant value.
              auto value = element.value.getValue();
              if (previous) {
                // This APInt should have enough space to
                // safely add 1 without overflowing.
                *previous += 1;
                if (value != previous) {
                  os << " = ";
                  os.printAttributeWithoutType(element.value);
                }
              } else if (!element.value.getValue().isZero()) {
                os << " = ";
                os.printAttributeWithoutType(element.value);
              }
              previous = value;
 
              // Print the data type.
              bool skipType = false;
              if (auto type = dyn_cast<UIntType>(element.type))
                if (type.getWidth() == 0)
                  skipType = true;
              if (!skipType) {
                os << ": ";
                printNestedType(element.type, os);
              }
            });
        os << '>';
      })
      .Case<FVectorType, OpenVectorType>([&](auto vectorType) {
        if (firrtl::type_isa<OpenVectorType>(vectorType))
          os << "open";
        os << "vector<";
        printNestedType(vectorType.getElementType(), os);
        os << ", " << vectorType.getNumElements() << '>';
      })
      .Case<RefType>([&](RefType refType) {
        if (refType.getForceable())
          os << "rw";
        os << "probe<";
        printNestedType(refType.getType(), os);
        if (auto layer = refType.getLayer())
          os << ", " << layer;
        os << '>';
      })
      .Case<LHSType>([&](LHSType lhstype) {
        os << "lhs<";
        printNestedType(lhstype.getType(), os);
        os << ">";
      })
      .Case<StringType>([&](auto stringType) { os << "string"; })
      .Case<FIntegerType>([&](auto integerType) { os << "integer"; })
      .Case<BoolType>([&](auto boolType) { os << "bool"; })
      .Case<DoubleType>([&](auto doubleType) { os << "double"; })
      .Case<ListType>([&](auto listType) {
        os << "list<";
        printNestedType(listType.getElementType(), os);
        os << '>';
      })
      .Case<RegistryType>([&](auto registryType) {
        os << "registry<";
        printNestedType(registryType.getElementType(), os);
        os << '>';
      })
      .Case<PathType>([&](auto pathType) { os << "path"; })
      .Case<BaseTypeAliasType>([&](BaseTypeAliasType alias) {
        os << "alias<" << alias.getName().getValue() << ", ";
        printNestedType(alias.getInnerType(), os);
        os << '>';
      })
      .Case<ClassType>([&](ClassType type) {
        os << "class<";
        type.printInterface(os);
        os << ">";
      })
      .Case<AnyRefType>([&](AnyRefType type) { os << "anyref"; })
      .Case<FStringType>([&](auto) { os << "fstring"; })
      .Case<DomainType>([&](DomainType type) {
        os << "domain<";
        os.printSymbolName(type.getName().getValue());
        os << "(";
        llvm::interleaveComma(type.getFields(), os, [&](Attribute attr) {
          auto field = cast<DomainFieldAttr>(attr);
          os << field.getName().getValue() << ": ";
          os.printType(field.getType());
        });
        os << ")";
        os << ">";
      })
      .Default([&](auto) { anyFailed = true; });
  return failure(anyFailed);
}
// NOLINTEND(misc-no-recursion)
 
/// Print a type defined by this dialect.
void circt::firrtl::printNestedType(Type type, AsmPrinter &os) {
  // Try the custom type printer.
  if (succeeded(customTypePrinter(type, os)))
    return;
 
  // None of the above recognized the type, so we bail.
  assert(false && "type to print unknown to FIRRTL dialect");
}
 
//===----------------------------------------------------------------------===//
// Type Parsing
//===----------------------------------------------------------------------===//
 
/// Parse a type with a custom parser implementation.
///
/// This only accepts a subset of all types in the dialect. Use `parseType`
/// instead, which will call this function in turn, as appropriate.
///
/// Returns `std::nullopt` if the type `name` is not covered by the custom
/// parsers. Otherwise returns success or failure as appropriate. On success,
/// `result` is set to the resulting type.
///
/// ```plain
/// firrtl-type
///   ::= clock
///   ::= reset
///   ::= asyncreset
///   ::= sint ('<' int '>')?
///   ::= uint ('<' int '>')?
///   ::= analog ('<' int '>')?
///   ::= bundle '<' (bundle-elt (',' bundle-elt)*)? '>'
///   ::= enum '<' (enum-elt (',' enum-elt)*)? '>'
///   ::= vector '<' type ',' int '>'
///   ::= const '.' type
///   ::= 'property.' firrtl-phased-type
/// bundle-elt ::= identifier flip? ':' type
/// enum-elt ::= identifier ':' type
/// ```
static OptionalParseResult customTypeParser(AsmParser &parser, StringRef name,
                                            Type &result) {
  bool isConst = false;
  const char constPrefix[] = "const.";
  if (name.starts_with(constPrefix)) {
    isConst = true;
    name = name.drop_front(std::size(constPrefix) - 1);
  }
 
  auto *context = parser.getContext();
  if (name == "clock")
    return result = ClockType::get(context, isConst), success();
  if (name == "reset")
    return result = ResetType::get(context, isConst), success();
  if (name == "asyncreset")
    return result = AsyncResetType::get(context, isConst), success();
 
  if (name == "sint" || name == "uint" || name == "analog") {
    // Parse the width specifier if it exists.
    int32_t width = -1;
    if (!parser.parseOptionalLess()) {
      if (parser.parseInteger(width) || parser.parseGreater())
        return failure();
 
      if (width < 0)
        return parser.emitError(parser.getNameLoc(), "unknown width"),
               failure();
    }
 
    if (name == "sint")
      result = SIntType::get(context, width, isConst);
    else if (name == "uint")
      result = UIntType::get(context, width, isConst);
    else {
      assert(name == "analog");
      result = AnalogType::get(context, width, isConst);
    }
    return success();
  }
 
  if (name == "bundle") {
    SmallVector<BundleType::BundleElement, 4> elements;
 
    auto parseBundleElement = [&]() -> ParseResult {
      std::string nameStr;
      StringRef name;
      FIRRTLBaseType type;
 
      if (failed(parser.parseKeywordOrString(&nameStr)))
        return failure();
      name = nameStr;
 
      bool isFlip = succeeded(parser.parseOptionalKeyword("flip"));
      if (parser.parseColon() || parseNestedBaseType(type, parser))
        return failure();
 
      elements.push_back({StringAttr::get(context, name), isFlip, type});
      return success();
    };
 
    if (parser.parseCommaSeparatedList(mlir::AsmParser::Delimiter::LessGreater,
                                       parseBundleElement))
      return failure();
 
    result = parser.getChecked<BundleType>(context, elements, isConst);
    return failure(!result);
  }
  if (name == "openbundle") {
    SmallVector<OpenBundleType::BundleElement, 4> elements;
 
    auto parseBundleElement = [&]() -> ParseResult {
      std::string nameStr;
      StringRef name;
      FIRRTLType type;
 
      if (failed(parser.parseKeywordOrString(&nameStr)))
        return failure();
      name = nameStr;
 
      bool isFlip = succeeded(parser.parseOptionalKeyword("flip"));
      if (parser.parseColon() || parseNestedType(type, parser))
        return failure();
 
      elements.push_back({StringAttr::get(context, name), isFlip, type});
      return success();
    };
 
    if (parser.parseCommaSeparatedList(mlir::AsmParser::Delimiter::LessGreater,
                                       parseBundleElement))
      return failure();
 
    result = parser.getChecked<OpenBundleType>(context, elements, isConst);
    return failure(!result);
  }
 
  if (name == "enum") {
    SmallVector<StringAttr> names;
    SmallVector<APInt> values;
    SmallVector<FIRRTLBaseType> types;
    auto parseEnumElement = [&]() -> ParseResult {
      // Parse the variant tag.
      std::string nameStr;
      if (failed(parser.parseKeywordOrString(&nameStr)))
        return failure();
      names.push_back(StringAttr::get(context, nameStr));
 
      // Parse the integer value if it exists. If its the first element of the
      // enum, it implicitly has a value of 0, otherwise it defaults to the
      // previous value + 1.
      APInt value;
      if (succeeded(parser.parseOptionalEqual())) {
        if (parser.parseInteger(value))
          return failure();
      } else if (values.empty()) {
        // This is the first enum variant, so it defaults to 0.
        value = APInt(1, 0);
      } else {
        // This value is not specified, so it defaults to the previous value
        // + 1.
        auto &prev = values.back();
        if (prev.isMaxValue())
          value = prev.zext(prev.getBitWidth() + 1);
        else
          value = prev;
        ++value;
      }
      values.push_back(std::move(value));
 
      // Parse the type of the variant data.
      FIRRTLBaseType type;
      if (succeeded(parser.parseOptionalColon())) {
        if (parseNestedBaseType(type, parser))
          return failure();
      } else {
        type = UIntType::get(parser.getContext(), 0);
      }
      types.push_back(type);
 
      return success();
    };
 
    if (parser.parseCommaSeparatedList(mlir::AsmParser::Delimiter::LessGreater,
                                       parseEnumElement))
      return failure();
 
    // Find the bitwidth of the enum.
    unsigned bitwidth = 0;
    for (auto &value : values)
      bitwidth = std::max(bitwidth, value.getActiveBits());
    auto tagType = IntegerType::get(context, bitwidth, IntegerType::Unsigned);
 
    SmallVector<FEnumType::EnumElement, 4> elements;
    for (auto [name, value, type] : llvm::zip(names, values, types)) {
      auto tagValue = value.zextOrTrunc(bitwidth);
      elements.push_back({name, IntegerAttr::get(tagType, tagValue), type});
    }
 
    if (failed(FEnumType::verify(
            [&]() { return parser.emitError(parser.getNameLoc()); }, elements,
            isConst)))
      return failure();
 
    result = parser.getChecked<FEnumType>(context, elements, isConst);
    return failure(!result);
  }
 
  if (name == "vector") {
    FIRRTLBaseType elementType;
    uint64_t width = 0;
 
    if (parser.parseLess() || parseNestedBaseType(elementType, parser) ||
        parser.parseComma() || parser.parseInteger(width) ||
        parser.parseGreater())
      return failure();
 
    return result = FVectorType::get(elementType, width, isConst), success();
  }
  if (name == "openvector") {
    FIRRTLType elementType;
    uint64_t width = 0;
 
    if (parser.parseLess() || parseNestedType(elementType, parser) ||
        parser.parseComma() || parser.parseInteger(width) ||
        parser.parseGreater())
      return failure();
 
    result =
        parser.getChecked<OpenVectorType>(context, elementType, width, isConst);
    return failure(!result);
  }
 
  // For now, support both firrtl.ref and firrtl.probe.
  if (name == "ref" || name == "probe") {
    FIRRTLBaseType type;
    SymbolRefAttr layer;
    // Don't pass `isConst` to `parseNestedBaseType since `ref` can point to
    // either `const` or non-`const` types
    if (parser.parseLess() || parseNestedBaseType(type, parser))
      return failure();
    if (parser.parseOptionalComma().succeeded())
      if (parser.parseOptionalAttribute(layer).value())
        return parser.emitError(parser.getNameLoc(),
                                "expected symbol reference");
    if (parser.parseGreater())
      return failure();
 
    if (failed(RefType::verify(
            [&]() { return parser.emitError(parser.getNameLoc()); }, type,
            false, layer)))
      return failure();
 
    return result = RefType::get(type, false, layer), success();
  }
  if (name == "lhs") {
    FIRRTLType type;
    if (parser.parseLess() || parseNestedType(type, parser) ||
        parser.parseGreater())
      return failure();
    if (!isa<FIRRTLBaseType>(type))
      return parser.emitError(parser.getNameLoc(), "expected base type");
    result = parser.getChecked<LHSType>(context, cast<FIRRTLBaseType>(type));
    return failure(!result);
  }
  if (name == "rwprobe") {
    FIRRTLBaseType type;
    SymbolRefAttr layer;
    if (parser.parseLess() || parseNestedBaseType(type, parser))
      return failure();
    if (parser.parseOptionalComma().succeeded())
      if (parser.parseOptionalAttribute(layer).value())
        return parser.emitError(parser.getNameLoc(),
                                "expected symbol reference");
    if (parser.parseGreater())
      return failure();
 
    if (failed(RefType::verify(
            [&]() { return parser.emitError(parser.getNameLoc()); }, type, true,
            layer)))
      return failure();
 
    return result = RefType::get(type, true, layer), success();
  }
  if (name == "class") {
    if (isConst)
      return parser.emitError(parser.getNameLoc(), "classes cannot be const");
    ClassType classType;
    if (parser.parseLess() || ClassType::parseInterface(parser, classType) ||
        parser.parseGreater())
      return failure();
    result = classType;
    return success();
  }
  if (name == "anyref") {
    if (isConst)
      return parser.emitError(parser.getNameLoc(), "any refs cannot be const");
 
    result = AnyRefType::get(parser.getContext());
    return success();
  }
  if (name == "string") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "strings cannot be const");
      return failure();
    }
    result = StringType::get(parser.getContext());
    return success();
  }
  if (name == "integer") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "bigints cannot be const");
      return failure();
    }
    result = FIntegerType::get(parser.getContext());
    return success();
  }
  if (name == "bool") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "bools cannot be const");
      return failure();
    }
    result = BoolType::get(parser.getContext());
    return success();
  }
  if (name == "double") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "doubles cannot be const");
      return failure();
    }
    result = DoubleType::get(parser.getContext());
    return success();
  }
  if (name == "list") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "lists cannot be const");
      return failure();
    }
    PropertyType elementType;
    if (parser.parseLess() || parseNestedPropertyType(elementType, parser) ||
        parser.parseGreater())
      return failure();
    result = parser.getChecked<ListType>(context, elementType);
    if (!result)
      return failure();
    return success();
  }
  if (name == "registry") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "registries cannot be const");
      return failure();
    }
    PropertyType elementType;
    if (parser.parseLess() || parseNestedPropertyType(elementType, parser) ||
        parser.parseGreater())
      return failure();
    result = RegistryType::get(context, elementType);
    if (!result)
      return failure();
    return success();
  }
  if (name == "path") {
    if (isConst) {
      parser.emitError(parser.getNameLoc(), "path cannot be const");
      return failure();
    }
    result = PathType::get(parser.getContext());
    return success();
  }
  if (name == "alias") {
    FIRRTLBaseType type;
    StringRef name;
    if (parser.parseLess() || parser.parseKeyword(&name) ||
        parser.parseComma() || parseNestedBaseType(type, parser) ||
        parser.parseGreater())
      return failure();
 
    return result =
               BaseTypeAliasType::get(StringAttr::get(context, name), type),
           success();
  }
  if (name == "fstring") {
    return result = FStringType::get(context), success();
  }
  if (name == "domain") {
    // Parse: !firrtl.domain<@SymbolName> or
    //        !firrtl.domain<@SymbolName(name: type, ...)>
    DomainType domainType;
    if (parser.parseLess() || DomainType::parseInterface(parser, domainType) ||
        parser.parseGreater())
      return failure();
 
    result = domainType;
    return success();
  }
 
  return {};
}
 
/// Parse a type defined by this dialect.
///
/// This will first try the generated type parsers and then resort to the custom
/// parser implementation. Emits an error and returns failure if `name` does not
/// refer to a type defined in this dialect.
static ParseResult parseType(Type &result, StringRef name, AsmParser &parser) {
  // Try the custom type parser.
  OptionalParseResult parseResult = customTypeParser(parser, name, result);
  if (parseResult.has_value())
    return parseResult.value();
 
  // None of the above recognized the type, so we bail.
  parser.emitError(parser.getNameLoc(), "unknown FIRRTL dialect type: \"")
      << name << "\"";
  return failure();
}
 
/// Parse a `FIRRTLType` with a `name` that has already been parsed.
///
/// Note that only a subset of types defined in the FIRRTL dialect inherit from
/// `FIRRTLType`. Use `parseType` to parse *any* of the defined types.
static ParseResult parseFIRRTLType(FIRRTLType &result, StringRef name,
                                   AsmParser &parser) {
  Type type;
  if (failed(parseType(type, name, parser)))
    return failure();
  result = type_dyn_cast<FIRRTLType>(type);
  if (result)
    return success();
  parser.emitError(parser.getNameLoc(), "unknown FIRRTL type: \"")
      << name << "\"";
  return failure();
}
 
static ParseResult parseFIRRTLBaseType(FIRRTLBaseType &result, StringRef name,
                                       AsmParser &parser) {
  FIRRTLType type;
  if (failed(parseFIRRTLType(type, name, parser)))
    return failure();
  if (auto base = type_dyn_cast<FIRRTLBaseType>(type)) {
    result = base;
    return success();
  }
  parser.emitError(parser.getNameLoc(), "expected base type, found ") << type;
  return failure();
}
 
static ParseResult parseFIRRTLPropertyType(PropertyType &result, StringRef name,
                                           AsmParser &parser) {
  FIRRTLType type;
  if (failed(parseFIRRTLType(type, name, parser)))
    return failure();
  if (auto prop = type_dyn_cast<PropertyType>(type)) {
    result = prop;
    return success();
  }
  parser.emitError(parser.getNameLoc(), "expected property type, found ")
      << type;
  return failure();
}
 
// NOLINTBEGIN(misc-no-recursion)
/// Parse a `FIRRTLType`.
///
/// Note that only a subset of types defined in the FIRRTL dialect inherit from
/// `FIRRTLType`. Use `parseType` to parse *any* of the defined types.
ParseResult circt::firrtl::parseNestedType(FIRRTLType &result,
                                           AsmParser &parser) {
  StringRef name;
  if (parser.parseKeyword(&name))
    return failure();
  return parseFIRRTLType(result, name, parser);
}
// NOLINTEND(misc-no-recursion)
 
// NOLINTBEGIN(misc-no-recursion)
ParseResult circt::firrtl::parseNestedBaseType(FIRRTLBaseType &result,
                                               AsmParser &parser) {
  StringRef name;
  if (parser.parseKeyword(&name))
    return failure();
  return parseFIRRTLBaseType(result, name, parser);
}
// NOLINTEND(misc-no-recursion)
 
// NOLINTBEGIN(misc-no-recursion)
ParseResult circt::firrtl::parseNestedPropertyType(PropertyType &result,
                                                   AsmParser &parser) {
  StringRef name;
  if (parser.parseKeyword(&name))
    return failure();
  return parseFIRRTLPropertyType(result, name, parser);
}
// NOLINTEND(misc-no-recursion)
 
//===---------------------------------------------------------------------===//
// Dialect Type Parsing and Printing
//===----------------------------------------------------------------------===//
 
/// Print a type registered to this dialect.
void FIRRTLDialect::printType(Type type, DialectAsmPrinter &os) const {
  printNestedType(type, os);
}
 
/// Parse a type registered to this dialect.
Type FIRRTLDialect::parseType(DialectAsmParser &parser) const {
  StringRef name;
  Type result;
  if (parser.parseKeyword(&name) || ::parseType(result, name, parser))
    return Type();
  return result;
}
 
//===----------------------------------------------------------------------===//
// Recursive Type Properties
//===----------------------------------------------------------------------===//
 
enum {
  /// Bit set if the type only contains passive elements.
  IsPassiveBitMask = 0x1,
  /// Bit set if the type contains an analog type.
  ContainsAnalogBitMask = 0x2,
  /// Bit set fi the type has any uninferred bit widths.
  HasUninferredWidthBitMask = 0x4,
};
 
//===----------------------------------------------------------------------===//
// FIRRTLBaseType Implementation
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::FIRRTLBaseTypeStorage : mlir::TypeStorage {
  // Use `char` instead of `bool` since llvm already provides a
  // DenseMapInfo<char> specialization
  using KeyTy = char;
 
  FIRRTLBaseTypeStorage(bool isConst) : isConst(static_cast<char>(isConst)) {}
 
  bool operator==(const KeyTy &key) const { return key == isConst; }
 
  KeyTy getAsKey() const { return isConst; }
 
  static FIRRTLBaseTypeStorage *construct(TypeStorageAllocator &allocator,
                                          KeyTy key) {
    return new (allocator.allocate<FIRRTLBaseTypeStorage>())
        FIRRTLBaseTypeStorage(key);
  }
 
  char isConst;
};
 
/// Return true if this is a 'ground' type, aka a non-aggregate type.
bool FIRRTLType::isGround() {
  return TypeSwitch<FIRRTLType, bool>(*this)
      .Case<ClockType, ResetType, AsyncResetType, SIntType, UIntType,
            AnalogType>([](Type) { return true; })
      .Case<BundleType, FVectorType, FEnumType, OpenBundleType, OpenVectorType>(
          [](Type) { return false; })
      .Case<BaseTypeAliasType>([](BaseTypeAliasType alias) {
        return alias.getAnonymousType().isGround();
      })
      // Not ground per spec, but leaf of aggregate.
      .Case<PropertyType, RefType>([](Type) { return false; })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return false;
      });
}
 
bool FIRRTLType::isConst() const {
  return TypeSwitch<FIRRTLType, bool>(*this)
      .Case<FIRRTLBaseType, OpenBundleType, OpenVectorType>(
          [](auto type) { return type.isConst(); })
      .Default(false);
}
 
bool FIRRTLBaseType::isConst() const { return getImpl()->isConst; }
 
RecursiveTypeProperties FIRRTLType::getRecursiveTypeProperties() const {
  return TypeSwitch<FIRRTLType, RecursiveTypeProperties>(*this)
      .Case<ClockType, ResetType, AsyncResetType>([](FIRRTLBaseType type) {
        return RecursiveTypeProperties{true,
                                       false,
                                       false,
                                       type.isConst(),
                                       false,
                                       false,
                                       firrtl::type_isa<ResetType>(type)};
      })
      .Case<SIntType, UIntType>([](auto type) {
        return RecursiveTypeProperties{
            true, false, false, type.isConst(), false, !type.hasWidth(), false};
      })
      .Case<AnalogType>([](auto type) {
        return RecursiveTypeProperties{
            true, false, true, type.isConst(), false, !type.hasWidth(), false};
      })
      .Case<BundleType, FVectorType, FEnumType, OpenBundleType, OpenVectorType,
            RefType, BaseTypeAliasType>(
          [](auto type) { return type.getRecursiveTypeProperties(); })
      .Case<PropertyType>([](auto type) {
        return RecursiveTypeProperties{true,  false, false, false,
                                       false, false, false};
      })
      .Case<LHSType>(
          [](auto type) { return type.getType().getRecursiveTypeProperties(); })
      .Case<FStringType>([](auto type) {
        return RecursiveTypeProperties{true,  false, false, false,
                                       false, false, false};
      })
      .Case<DomainType>([](auto type) {
        return RecursiveTypeProperties{true,  false, false, false,
                                       false, false, false};
      })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return RecursiveTypeProperties{};
      });
}
 
/// Return this type with any type aliases recursively removed from itself.
FIRRTLBaseType FIRRTLBaseType::getAnonymousType() {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType, SIntType, UIntType,
            AnalogType>([&](Type) { return *this; })
      .Case<BundleType, FVectorType, FEnumType, BaseTypeAliasType>(
          [](auto type) { return type.getAnonymousType(); })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// Return this type with any flip types recursively removed from itself.
FIRRTLBaseType FIRRTLBaseType::getPassiveType() {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType, SIntType, UIntType,
            AnalogType, FEnumType>([&](Type) { return *this; })
      .Case<BundleType, FVectorType, FEnumType, BaseTypeAliasType>(
          [](auto type) { return type.getPassiveType(); })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// Return a 'const' or non-'const' version of this type.
FIRRTLBaseType FIRRTLBaseType::getConstType(bool isConst) const {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType, AnalogType, SIntType,
            UIntType, BundleType, FVectorType, FEnumType, BaseTypeAliasType>(
          [&](auto type) { return type.getConstType(isConst); })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// Return this type with a 'const' modifiers dropped
FIRRTLBaseType FIRRTLBaseType::getAllConstDroppedType() {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType, AnalogType, SIntType,
            UIntType>([&](auto type) { return type.getConstType(false); })
      .Case<BundleType, FVectorType, FEnumType, BaseTypeAliasType>(
          [&](auto type) { return type.getAllConstDroppedType(); })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// Return this type with all ground types replaced with UInt<1>.  This is
/// used for `mem` operations.
FIRRTLBaseType FIRRTLBaseType::getMaskType() {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType, SIntType, UIntType,
            AnalogType, FEnumType>([&](Type) {
        return UIntType::get(this->getContext(), 1, this->isConst());
      })
      .Case<BundleType>([&](BundleType bundleType) {
        SmallVector<BundleType::BundleElement, 4> newElements;
        newElements.reserve(bundleType.getElements().size());
        for (auto elt : bundleType)
          newElements.push_back(
              {elt.name, false /* FIXME */, elt.type.getMaskType()});
        return BundleType::get(this->getContext(), newElements,
                               bundleType.isConst());
      })
      .Case<FVectorType>([](FVectorType vectorType) {
        return FVectorType::get(vectorType.getElementType().getMaskType(),
                                vectorType.getNumElements(),
                                vectorType.isConst());
      })
      .Case<BaseTypeAliasType>([](BaseTypeAliasType base) {
        return base.getModifiedType(base.getInnerType().getMaskType());
      })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// Remove the widths from this type. All widths are replaced with an
/// unknown width.
FIRRTLBaseType FIRRTLBaseType::getWidthlessType() {
  return TypeSwitch<FIRRTLBaseType, FIRRTLBaseType>(*this)
      .Case<ClockType, ResetType, AsyncResetType>([](auto a) { return a; })
      .Case<UIntType, SIntType, AnalogType>(
          [&](auto a) { return a.get(this->getContext(), -1, a.isConst()); })
      .Case<BundleType>([&](auto a) {
        SmallVector<BundleType::BundleElement, 4> newElements;
        newElements.reserve(a.getElements().size());
        for (auto elt : a)
          newElements.push_back(
              {elt.name, elt.isFlip, elt.type.getWidthlessType()});
        return BundleType::get(this->getContext(), newElements, a.isConst());
      })
      .Case<FVectorType>([](auto a) {
        return FVectorType::get(a.getElementType().getWidthlessType(),
                                a.getNumElements(), a.isConst());
      })
      .Case<FEnumType>([&](FEnumType a) {
        SmallVector<FEnumType::EnumElement, 4> newElements;
        newElements.reserve(a.getNumElements());
        for (auto elt : a)
          newElements.push_back(
              {elt.name, elt.value, elt.type.getWidthlessType()});
        return FEnumType::get(this->getContext(), newElements, a.isConst());
      })
      .Case<BaseTypeAliasType>([](BaseTypeAliasType type) {
        return type.getModifiedType(type.getInnerType().getWidthlessType());
      })
      .Default([](auto) {
        llvm_unreachable("unknown FIRRTL type");
        return FIRRTLBaseType();
      });
}
 
/// If this is an IntType, AnalogType, or sugar type for a single bit (Clock,
/// Reset, etc) then return the bitwidth.  Return -1 if the is one of these
/// types but without a specified bitwidth.  Return -2 if this isn't a simple
/// type.
int32_t FIRRTLBaseType::getBitWidthOrSentinel() {
  return TypeSwitch<FIRRTLBaseType, int32_t>(*this)
      .Case<ClockType, ResetType, AsyncResetType>([](Type) { return 1; })
      .Case<SIntType, UIntType>(
          [&](IntType intType) { return intType.getWidthOrSentinel(); })
      .Case<AnalogType>(
          [](AnalogType analogType) { return analogType.getWidthOrSentinel(); })
      .Case<FEnumType>([&](FEnumType fenum) { return fenum.getBitWidth(); })
      .Case<BundleType, FVectorType>([](Type) { return -2; })
      .Case<BaseTypeAliasType>([](BaseTypeAliasType type) {
        // It's faster to use its anonymous type.
        return type.getAnonymousType().getBitWidthOrSentinel();
      })
      .Default([](Type) {
        llvm_unreachable("unknown FIRRTL type");
        return -2;
      });
}
 
/// Return true if this is a type usable as a reset. This must be
/// either an abstract reset, a concrete 1-bit UInt, an
/// asynchronous reset, or an uninfered width UInt.
bool FIRRTLBaseType::isResetType() {
  return TypeSwitch<FIRRTLType, bool>(*this)
      .Case<ResetType, AsyncResetType>([](Type) { return true; })
      .Case<UIntType>(
          [](UIntType a) { return !a.hasWidth() || a.getWidth() == 1; })
      .Case<BaseTypeAliasType>(
          [](auto type) { return type.getInnerType().isResetType(); })
      .Default([](Type) { return false; });
}
 
bool firrtl::isConst(Type type) {
  return TypeSwitch<Type, bool>(type)
      .Case<FIRRTLBaseType, OpenBundleType, OpenVectorType>(
          [](auto base) { return base.isConst(); })
      .Default(false);
}
 
bool firrtl::containsConst(Type type) {
  return TypeSwitch<Type, bool>(type)
      .Case<FIRRTLBaseType, OpenBundleType, OpenVectorType>(
          [](auto base) { return base.containsConst(); })
      .Default(false);
}
 
// NOLINTBEGIN(misc-no-recursion)
bool firrtl::hasZeroBitWidth(FIRRTLType type) {
  return FIRRTLTypeSwitch<FIRRTLType, bool>(type)
      .Case<BundleType>([&](auto bundle) {
        for (size_t i = 0, e = bundle.getNumElements(); i < e; ++i) {
          auto elt = bundle.getElement(i);
          if (hasZeroBitWidth(elt.type))
            return true;
        }
        return bundle.getNumElements() == 0;
      })
      .Case<FVectorType>([&](auto vector) {
        if (vector.getNumElements() == 0)
          return true;
        return hasZeroBitWidth(vector.getElementType());
      })
      .Case<FIRRTLBaseType>([](auto groundType) {
        return firrtl::getBitWidth(groundType).value_or(0) == 0;
      })
      .Case<RefType>([](auto ref) { return hasZeroBitWidth(ref.getType()); })
      .Default([](auto) { return false; });
}
// NOLINTEND(misc-no-recursion)
 
/// Helper to implement the equivalence logic for a pair of bundle elements.
/// Note that the FIRRTL spec requires bundle elements to have the same
/// orientation, but this only compares their passive types. The FIRRTL dialect
/// differs from the spec in how it uses flip types for module output ports and
/// canonicalizes flips in bundles, so only passive types can be compared here.
static bool areBundleElementsEquivalent(BundleType::BundleElement destElement,
                                        BundleType::BundleElement srcElement,
                                        bool destOuterTypeIsConst,
                                        bool srcOuterTypeIsConst,
                                        bool requiresSameWidth) {
  if (destElement.name != srcElement.name)
    return false;
  if (destElement.isFlip != srcElement.isFlip)
    return false;
 
  if (destElement.isFlip) {
    std::swap(destElement, srcElement);
    std::swap(destOuterTypeIsConst, srcOuterTypeIsConst);
  }
 
  return areTypesEquivalent(destElement.type, srcElement.type,
                            destOuterTypeIsConst, srcOuterTypeIsConst,
                            requiresSameWidth);
}
 
/// Returns whether the two types are equivalent.  This implements the exact
/// definition of type equivalence in the FIRRTL spec.  If the types being
/// compared have any outer flips that encode FIRRTL module directions (input or
/// output), these should be stripped before using this method.
bool firrtl::areTypesEquivalent(FIRRTLType destFType, FIRRTLType srcFType,
                                bool destOuterTypeIsConst,
                                bool srcOuterTypeIsConst,
                                bool requireSameWidths) {
  auto destType = type_dyn_cast<FIRRTLBaseType>(destFType);
  auto srcType = type_dyn_cast<FIRRTLBaseType>(srcFType);
 
  // For non-base types, only equivalent if identical.
  if (!destType || !srcType)
    return destFType == srcFType;
 
  bool srcIsConst = srcOuterTypeIsConst || srcFType.isConst();
  bool destIsConst = destOuterTypeIsConst || destFType.isConst();
 
  // Vector types can be connected if they have the same size and element type.
  auto destVectorType = type_dyn_cast<FVectorType>(destType);
  auto srcVectorType = type_dyn_cast<FVectorType>(srcType);
  if (destVectorType && srcVectorType)
    return destVectorType.getNumElements() == srcVectorType.getNumElements() &&
           areTypesEquivalent(destVectorType.getElementType(),
                              srcVectorType.getElementType(), destIsConst,
                              srcIsConst, requireSameWidths);
 
  // Bundle types can be connected if they have the same size, element names,
  // and element types.
  auto destBundleType = type_dyn_cast<BundleType>(destType);
  auto srcBundleType = type_dyn_cast<BundleType>(srcType);
  if (destBundleType && srcBundleType) {
    auto destElements = destBundleType.getElements();
    auto srcElements = srcBundleType.getElements();
    size_t numDestElements = destElements.size();
    if (numDestElements != srcElements.size())
      return false;
 
    for (size_t i = 0; i < numDestElements; ++i) {
      auto destElement = destElements[i];
      auto srcElement = srcElements[i];
      if (!areBundleElementsEquivalent(destElement, srcElement, destIsConst,
                                       srcIsConst, requireSameWidths))
        return false;
    }
    return true;
  }
 
  // Enum types can be connected if they have the same size, element names, and
  // element types.
  auto dstEnumType = type_dyn_cast<FEnumType>(destType);
  auto srcEnumType = type_dyn_cast<FEnumType>(srcType);
 
  if (dstEnumType && srcEnumType) {
    if (dstEnumType.getNumElements() != srcEnumType.getNumElements())
      return false;
    // Enums requires the types to match exactly.
    for (const auto &[dst, src] : llvm::zip(dstEnumType, srcEnumType)) {
      // The variant names must match.
      if (dst.name != src.name)
        return false;
      // Enumeration types can only be connected if the inner types have the
      // same width.
      if (!areTypesEquivalent(dst.type, src.type, destIsConst, srcIsConst,
                              true))
        return false;
    }
    return true;
  }
 
  // Ground type connections must be const compatible.
  if (destIsConst && !srcIsConst)
    return false;
 
  // Reset types can be driven by UInt<1>, AsyncReset, or Reset types.
  if (firrtl::type_isa<ResetType>(destType))
    return srcType.isResetType();
 
  // Reset types can drive UInt<1>, AsyncReset, or Reset types.
  if (firrtl::type_isa<ResetType>(srcType))
    return destType.isResetType();
 
  // If we can implicitly truncate or extend the bitwidth, or either width is
  // currently uninferred, then compare the widthless version of these types.
  if (!requireSameWidths || destType.getBitWidthOrSentinel() == -1)
    srcType = srcType.getWidthlessType();
  if (!requireSameWidths || srcType.getBitWidthOrSentinel() == -1)
    destType = destType.getWidthlessType();
 
  // Ground types can be connected if their constless types are the same
  return destType.getConstType(false) == srcType.getConstType(false);
}
 
/// Returns whether the srcType can be const-casted to the destType.
bool firrtl::areTypesConstCastable(FIRRTLType destFType, FIRRTLType srcFType,
                                   bool srcOuterTypeIsConst) {
  // Identical types are always castable
  if (destFType == srcFType)
    return true;
 
  auto destType = type_dyn_cast<FIRRTLBaseType>(destFType);
  auto srcType = type_dyn_cast<FIRRTLBaseType>(srcFType);
 
  // For non-base types, only castable if identical.
  if (!destType || !srcType)
    return false;
 
  // Types must be passive
  if (!destType.isPassive() || !srcType.isPassive())
    return false;
 
  bool srcIsConst = srcType.isConst() || srcOuterTypeIsConst;
 
  // Cannot cast non-'const' src to 'const' dest
  if (destType.isConst() && !srcIsConst)
    return false;
 
  // Vector types can be casted if they have the same size and castable element
  // type.
  auto destVectorType = type_dyn_cast<FVectorType>(destType);
  auto srcVectorType = type_dyn_cast<FVectorType>(srcType);
  if (destVectorType && srcVectorType)
    return destVectorType.getNumElements() == srcVectorType.getNumElements() &&
           areTypesConstCastable(destVectorType.getElementType(),
                                 srcVectorType.getElementType(), srcIsConst);
  if (destVectorType != srcVectorType)
    return false;
 
  // Bundle types can be casted if they have the same size, element names,
  // and castable element types.
  auto destBundleType = type_dyn_cast<BundleType>(destType);
  auto srcBundleType = type_dyn_cast<BundleType>(srcType);
  if (destBundleType && srcBundleType) {
    auto destElements = destBundleType.getElements();
    auto srcElements = srcBundleType.getElements();
    size_t numDestElements = destElements.size();
    if (numDestElements != srcElements.size())
      return false;
 
    return llvm::all_of_zip(
        destElements, srcElements,
        [&](const auto &destElement, const auto &srcElement) {
          return destElement.name == srcElement.name &&
                 areTypesConstCastable(destElement.type, srcElement.type,
                                       srcIsConst);
        });
  }
  if (destBundleType != srcBundleType)
    return false;
 
  // Ground types can be casted if the source type is a const
  // version of the destination type
  return destType == srcType.getConstType(destType.isConst());
}
 
bool firrtl::areTypesRefCastable(Type dstType, Type srcType) {
  auto dstRefType = type_dyn_cast<RefType>(dstType);
  auto srcRefType = type_dyn_cast<RefType>(srcType);
  if (!dstRefType || !srcRefType)
    return false;
  if (dstRefType == srcRefType)
    return true;
  if (dstRefType.getForceable() && !srcRefType.getForceable())
    return false;
 
  // Okay walk the types recursively.  They must be identical "structurally"
  // with exception leaf (ground) types of destination can be uninferred
  // versions of the corresponding source type. (can lose width information or
  // become a more general reset type)
  // In addition, while not explicitly in spec its useful to allow probes
  // to have const cast away, especially for probes of literals and expressions
  // derived from them.  Check const as with const cast.
  // NOLINTBEGIN(misc-no-recursion)
  auto recurse = [&](auto &&f, FIRRTLBaseType dest, FIRRTLBaseType src,
                     bool srcOuterTypeIsConst) -> bool {
    // Fast-path for identical types.
    if (dest == src)
      return true;
 
    // Always passive inside probes, but for sanity assert this.
    assert(dest.isPassive() && src.isPassive());
 
    bool srcIsConst = src.isConst() || srcOuterTypeIsConst;
 
    // Cannot cast non-'const' src to 'const' dest
    if (dest.isConst() && !srcIsConst)
      return false;
 
    // Recurse through aggregates to get the leaves, checking
    // structural equivalence re:element count + names.
 
    if (auto destVectorType = type_dyn_cast<FVectorType>(dest)) {
      auto srcVectorType = type_dyn_cast<FVectorType>(src);
      return srcVectorType &&
             destVectorType.getNumElements() ==
                 srcVectorType.getNumElements() &&
             f(f, destVectorType.getElementType(),
               srcVectorType.getElementType(), srcIsConst);
    }
 
    if (auto destBundleType = type_dyn_cast<BundleType>(dest)) {
      auto srcBundleType = type_dyn_cast<BundleType>(src);
      if (!srcBundleType)
        return false;
      // (no need to check orientation, these are always passive)
      auto destElements = destBundleType.getElements();
      auto srcElements = srcBundleType.getElements();
 
      return destElements.size() == srcElements.size() &&
             llvm::all_of_zip(
                 destElements, srcElements,
                 [&](const auto &destElement, const auto &srcElement) {
                   return destElement.name == srcElement.name &&
                          f(f, destElement.type, srcElement.type, srcIsConst);
                 });
    }
 
    if (auto destEnumType = type_dyn_cast<FEnumType>(dest)) {
      auto srcEnumType = type_dyn_cast<FEnumType>(src);
      if (!srcEnumType)
        return false;
      auto destElements = destEnumType.getElements();
      auto srcElements = srcEnumType.getElements();
 
      return destElements.size() == srcElements.size() &&
             llvm::all_of_zip(
                 destElements, srcElements,
                 [&](const auto &destElement, const auto &srcElement) {
                   return destElement.name == srcElement.name &&
                          f(f, destElement.type, srcElement.type, srcIsConst);
                 });
    }
 
    // Reset types can be driven by UInt<1>, AsyncReset, or Reset types.
    if (type_isa<ResetType>(dest))
      return src.isResetType();
    // (but don't allow the other direction, can only become more general)
 
    // Compare against const src if dest is const.
    src = src.getConstType(dest.isConst());
 
    // Compare against widthless src if dest is widthless.
    if (dest.getBitWidthOrSentinel() == -1)
      src = src.getWidthlessType();
 
    return dest == src;
  };
 
  return recurse(recurse, dstRefType.getType(), srcRefType.getType(), false);
  // NOLINTEND(misc-no-recursion)
}
 
// NOLINTBEGIN(misc-no-recursion)
/// Returns true if the destination is at least as wide as an equivalent source.
bool firrtl::isTypeLarger(FIRRTLBaseType dstType, FIRRTLBaseType srcType) {
  return TypeSwitch<FIRRTLBaseType, bool>(dstType)
      .Case<BundleType>([&](auto dstBundle) {
        auto srcBundle = type_cast<BundleType>(srcType);
        for (size_t i = 0, n = dstBundle.getNumElements(); i < n; ++i) {
          auto srcElem = srcBundle.getElement(i);
          auto dstElem = dstBundle.getElement(i);
          if (dstElem.isFlip) {
            if (!isTypeLarger(srcElem.type, dstElem.type))
              return false;
          } else {
            if (!isTypeLarger(dstElem.type, srcElem.type))
              return false;
          }
        }
        return true;
      })
      .Case<FVectorType>([&](auto vector) {
        return isTypeLarger(vector.getElementType(),
                            type_cast<FVectorType>(srcType).getElementType());
      })
      .Default([&](auto dstGround) {
        int32_t destWidth = dstType.getPassiveType().getBitWidthOrSentinel();
        int32_t srcWidth = srcType.getPassiveType().getBitWidthOrSentinel();
        return destWidth <= -1 || srcWidth <= -1 || destWidth >= srcWidth;
      });
}
// NOLINTEND(misc-no-recursion)
 
bool firrtl::areAnonymousTypesEquivalent(FIRRTLBaseType lhs,
                                         FIRRTLBaseType rhs) {
  return lhs.getAnonymousType() == rhs.getAnonymousType();
}
 
bool firrtl::areAnonymousTypesEquivalent(mlir::Type lhs, mlir::Type rhs) {
  if (auto destBaseType = type_dyn_cast<FIRRTLBaseType>(lhs))
    if (auto srcBaseType = type_dyn_cast<FIRRTLBaseType>(rhs))
      return areAnonymousTypesEquivalent(destBaseType, srcBaseType);
 
  if (auto destRefType = type_dyn_cast<RefType>(lhs))
    if (auto srcRefType = type_dyn_cast<RefType>(rhs))
      return areAnonymousTypesEquivalent(destRefType.getType(),
                                         srcRefType.getType());
 
  return lhs == rhs;
}
 
/// Return the passive version of a firrtl type
/// top level for ODS constraint usage
Type firrtl::getPassiveType(Type anyBaseFIRRTLType) {
  return type_cast<FIRRTLBaseType>(anyBaseFIRRTLType).getPassiveType();
}
 
bool firrtl::isTypeInOut(Type type) {
  return llvm::TypeSwitch<Type, bool>(type)
      .Case<FIRRTLBaseType>([](auto type) {
        return !type.containsReference() &&
               (!type.isPassive() || type.containsAnalog());
      })
      .Default(false);
}
 
// NOLINTBEGIN(misc-no-recursion)
bool firrtl::hasHardwareElements(FIRRTLType type) {
  // Is a hardware base type
  if (isa<FIRRTLBaseType>(type))
    return true;
  // Check each element of the aggregate
  if (auto bundle = dyn_cast<OpenBundleType>(type))
    return llvm::any_of(bundle,
                        [](auto elt) { return hasHardwareElements(elt.type); });
  if (auto vector = dyn_cast<OpenVectorType>(type))
    return hasHardwareElements(vector.getElementType());
  return false;
}
// NOLINTEND(misc-no-recursion)
 
//===----------------------------------------------------------------------===//
// IntType
//===----------------------------------------------------------------------===//
 
/// Return a SIntType or UIntType with the specified signedness, width, and
/// constness
IntType IntType::get(MLIRContext *context, bool isSigned,
                     int32_t widthOrSentinel, bool isConst) {
  if (isSigned)
    return SIntType::get(context, widthOrSentinel, isConst);
  return UIntType::get(context, widthOrSentinel, isConst);
}
 
int32_t IntType::getWidthOrSentinel() const {
  if (auto sintType = type_dyn_cast<SIntType>(*this))
    return sintType.getWidthOrSentinel();
  if (auto uintType = type_dyn_cast<UIntType>(*this))
    return uintType.getWidthOrSentinel();
  return -1;
}
 
//===----------------------------------------------------------------------===//
// WidthTypeStorage
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::WidthTypeStorage : detail::FIRRTLBaseTypeStorage {
  WidthTypeStorage(int32_t width, bool isConst)
      : FIRRTLBaseTypeStorage(isConst), width(width) {}
  using KeyTy = std::tuple<int32_t, char>;
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(width, isConst); }
 
  static WidthTypeStorage *construct(TypeStorageAllocator &allocator,
                                     const KeyTy &key) {
    return new (allocator.allocate<WidthTypeStorage>())
        WidthTypeStorage(std::get<0>(key), std::get<1>(key));
  }
 
  int32_t width;
};
 
IntType IntType::getConstType(bool isConst) const {
 
  if (auto sIntType = type_dyn_cast<SIntType>(*this))
    return sIntType.getConstType(isConst);
  return type_cast<UIntType>(*this).getConstType(isConst);
}
 
//===----------------------------------------------------------------------===//
// SIntType
//===----------------------------------------------------------------------===//
 
SIntType SIntType::get(MLIRContext *context) { return get(context, -1, false); }
 
SIntType SIntType::get(MLIRContext *context, std::optional<int32_t> width,
                       bool isConst) {
  return get(context, width ? *width : -1, isConst);
}
 
LogicalResult SIntType::verify(function_ref<InFlightDiagnostic()> emitError,
                               int32_t widthOrSentinel, bool isConst) {
  if (widthOrSentinel < -1)
    return emitError() << "invalid width";
  return success();
}
 
int32_t SIntType::getWidthOrSentinel() const { return getImpl()->width; }
 
SIntType SIntType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), getWidthOrSentinel(), isConst);
}
 
//===----------------------------------------------------------------------===//
// UIntType
//===----------------------------------------------------------------------===//
 
UIntType UIntType::get(MLIRContext *context) { return get(context, -1, false); }
 
UIntType UIntType::get(MLIRContext *context, std::optional<int32_t> width,
                       bool isConst) {
  return get(context, width ? *width : -1, isConst);
}
 
LogicalResult UIntType::verify(function_ref<InFlightDiagnostic()> emitError,
                               int32_t widthOrSentinel, bool isConst) {
  if (widthOrSentinel < -1)
    return emitError() << "invalid width";
  return success();
}
 
int32_t UIntType::getWidthOrSentinel() const { return getImpl()->width; }
 
UIntType UIntType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), getWidthOrSentinel(), isConst);
}
 
//===----------------------------------------------------------------------===//
// Bundle Type
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::BundleTypeStorage
    : detail::FIRRTLBaseTypeStorage {
  using KeyTy = std::tuple<ArrayRef<BundleType::BundleElement>, char>;
 
  BundleTypeStorage(ArrayRef<BundleType::BundleElement> elements, bool isConst)
      : detail::FIRRTLBaseTypeStorage(isConst),
        elements(elements.begin(), elements.end()),
        props{true, false, false, isConst, false, false, false} {
    uint64_t fieldID = 0;
    fieldIDs.reserve(elements.size());
    for (auto &element : elements) {
      auto type = element.type;
      auto eltInfo = type.getRecursiveTypeProperties();
      props.isPassive &= eltInfo.isPassive & !element.isFlip;
      props.containsAnalog |= eltInfo.containsAnalog;
      props.containsReference |= eltInfo.containsReference;
      props.containsConst |= eltInfo.containsConst;
      props.containsTypeAlias |= eltInfo.containsTypeAlias;
      props.hasUninferredWidth |= eltInfo.hasUninferredWidth;
      props.hasUninferredReset |= eltInfo.hasUninferredReset;
      fieldID += 1;
      fieldIDs.push_back(fieldID);
      // Increment the field ID for the next field by the number of subfields.
      fieldID += hw::FieldIdImpl::getMaxFieldID(type);
    }
    maxFieldID = fieldID;
  }
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(elements, isConst); }
 
  static llvm::hash_code hashKey(const KeyTy &key) {
    return llvm::hash_value(key);
  }
 
  static BundleTypeStorage *construct(TypeStorageAllocator &allocator,
                                      KeyTy key) {
    return new (allocator.allocate<BundleTypeStorage>()) BundleTypeStorage(
        std::get<0>(key), static_cast<bool>(std::get<1>(key)));
  }
 
  SmallVector<BundleType::BundleElement, 4> elements;
  SmallVector<uint64_t, 4> fieldIDs;
  uint64_t maxFieldID;
 
  /// This holds the bits for the type's recursive properties, and can hold a
  /// pointer to a passive version of the type.
  RecursiveTypeProperties props;
  BundleType passiveType;
  BundleType anonymousType;
};
 
BundleType BundleType::get(MLIRContext *context,
                           ArrayRef<BundleElement> elements, bool isConst) {
  return Base::get(context, elements, isConst);
}
 
auto BundleType::getElements() const -> ArrayRef<BundleElement> {
  return getImpl()->elements;
}
 
/// Return a pair with the 'isPassive' and 'containsAnalog' bits.
RecursiveTypeProperties BundleType::getRecursiveTypeProperties() const {
  return getImpl()->props;
}
 
/// Return this type with any flip types recursively removed from itself.
FIRRTLBaseType BundleType::getPassiveType() {
  auto *impl = getImpl();
 
  // If we've already determined and cached the passive type, use it.
  if (impl->passiveType)
    return impl->passiveType;
 
  // If this type is already passive, use it and remember for next time.
  if (impl->props.isPassive) {
    impl->passiveType = *this;
    return *this;
  }
 
  // Otherwise at least one element is non-passive, rebuild a passive version.
  SmallVector<BundleType::BundleElement, 16> newElements;
  newElements.reserve(impl->elements.size());
  for (auto &elt : impl->elements) {
    newElements.push_back({elt.name, false, elt.type.getPassiveType()});
  }
 
  auto passiveType = BundleType::get(getContext(), newElements, isConst());
  impl->passiveType = passiveType;
  return passiveType;
}
 
BundleType BundleType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), getElements(), isConst);
}
 
BundleType BundleType::getAllConstDroppedType() {
  if (!containsConst())
    return *this;
 
  SmallVector<BundleElement> constDroppedElements(
      llvm::map_range(getElements(), [](BundleElement element) {
        element.type = element.type.getAllConstDroppedType();
        return element;
      }));
  return get(getContext(), constDroppedElements, false);
}
 
std::optional<unsigned> BundleType::getElementIndex(StringAttr name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
std::optional<unsigned> BundleType::getElementIndex(StringRef name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name.getValue() == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
StringAttr BundleType::getElementNameAttr(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index].name;
}
 
StringRef BundleType::getElementName(size_t index) {
  return getElementNameAttr(index).getValue();
}
 
std::optional<BundleType::BundleElement>
BundleType::getElement(StringAttr name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
std::optional<BundleType::BundleElement>
BundleType::getElement(StringRef name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
/// Look up an element by index.
BundleType::BundleElement BundleType::getElement(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index];
}
 
FIRRTLBaseType BundleType::getElementType(StringAttr name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
FIRRTLBaseType BundleType::getElementType(StringRef name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
FIRRTLBaseType BundleType::getElementType(size_t index) const {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index].type;
}
 
uint64_t BundleType::getFieldID(uint64_t index) const {
  return getImpl()->fieldIDs[index];
}
 
uint64_t BundleType::getIndexForFieldID(uint64_t fieldID) const {
  assert(!getElements().empty() && "Bundle must have >0 fields");
  auto fieldIDs = getImpl()->fieldIDs;
  auto *it = std::prev(llvm::upper_bound(fieldIDs, fieldID));
  return std::distance(fieldIDs.begin(), it);
}
 
std::pair<uint64_t, uint64_t>
BundleType::getIndexAndSubfieldID(uint64_t fieldID) const {
  auto index = getIndexForFieldID(fieldID);
  auto elementFieldID = getFieldID(index);
  return {index, fieldID - elementFieldID};
}
 
std::pair<Type, uint64_t>
BundleType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
  auto subfieldIndex = getIndexForFieldID(fieldID);
  auto subfieldType = getElementType(subfieldIndex);
  auto subfieldID = fieldID - getFieldID(subfieldIndex);
  return {subfieldType, subfieldID};
}
 
uint64_t BundleType::getMaxFieldID() const { return getImpl()->maxFieldID; }
 
std::pair<uint64_t, bool>
BundleType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  auto childRoot = getFieldID(index);
  auto rangeEnd = index + 1 >= getNumElements() ? getMaxFieldID()
                                                : (getFieldID(index + 1) - 1);
  return std::make_pair(fieldID - childRoot,
                        fieldID >= childRoot && fieldID <= rangeEnd);
}
 
bool BundleType::isConst() const { return getImpl()->isConst; }
 
BundleType::ElementType
BundleType::getElementTypePreservingConst(size_t index) {
  auto type = getElementType(index);
  return type.getConstType(type.isConst() || isConst());
}
 
/// Return this type with any type aliases recursively removed from itself.
FIRRTLBaseType BundleType::getAnonymousType() {
  auto *impl = getImpl();
 
  // If we've already determined and cached the anonymous type, use it.
  if (impl->anonymousType)
    return impl->anonymousType;
 
  // If this type is already anonymous, use it and remember for next time.
  if (!impl->props.containsTypeAlias) {
    impl->anonymousType = *this;
    return *this;
  }
 
  // Otherwise at least one element has an alias type, rebuild an anonymous
  // version.
  SmallVector<BundleType::BundleElement, 16> newElements;
  newElements.reserve(impl->elements.size());
  for (auto &elt : impl->elements)
    newElements.push_back({elt.name, elt.isFlip, elt.type.getAnonymousType()});
 
  auto anonymousType = BundleType::get(getContext(), newElements, isConst());
  impl->anonymousType = anonymousType;
  return anonymousType;
}
 
LogicalResult BundleType::verify(function_ref<InFlightDiagnostic()> emitErrorFn,
                                 ArrayRef<BundleElement> elements,
                                 bool isConst) {
  SmallPtrSet<StringAttr, 4> nameSet;
  for (auto &element : elements) {
    if (!nameSet.insert(element.name).second)
      return emitErrorFn() << "duplicate field name " << element.name
                           << " in bundle";
  }
 
  return success();
}
 
//===----------------------------------------------------------------------===//
// OpenBundle Type
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::OpenBundleTypeStorage : mlir::TypeStorage {
  using KeyTy = std::tuple<ArrayRef<OpenBundleType::BundleElement>, char>;
 
  OpenBundleTypeStorage(ArrayRef<OpenBundleType::BundleElement> elements,
                        bool isConst)
      : elements(elements.begin(), elements.end()),
        props{true, false, false, isConst, false, false, false},
        isConst(static_cast<char>(isConst)) {
    uint64_t fieldID = 0;
    fieldIDs.reserve(elements.size());
    for (auto &element : elements) {
      auto type = element.type;
      auto eltInfo = type.getRecursiveTypeProperties();
      props.isPassive &= eltInfo.isPassive & !element.isFlip;
      props.containsAnalog |= eltInfo.containsAnalog;
      props.containsReference |= eltInfo.containsReference;
      props.containsConst |= eltInfo.containsConst;
      props.containsTypeAlias |= eltInfo.containsTypeAlias;
      props.hasUninferredWidth |= eltInfo.hasUninferredWidth;
      props.hasUninferredReset |= eltInfo.hasUninferredReset;
      fieldID += 1;
      fieldIDs.push_back(fieldID);
      // Increment the field ID for the next field by the number of subfields.
      // TODO: Maybe just have elementType be FieldIDTypeInterface ?
      fieldID += hw::FieldIdImpl::getMaxFieldID(type);
    }
    maxFieldID = fieldID;
  }
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  static llvm::hash_code hashKey(const KeyTy &key) {
    return llvm::hash_value(key);
  }
 
  KeyTy getAsKey() const { return KeyTy(elements, isConst); }
 
  static OpenBundleTypeStorage *construct(TypeStorageAllocator &allocator,
                                          KeyTy key) {
    return new (allocator.allocate<OpenBundleTypeStorage>())
        OpenBundleTypeStorage(std::get<0>(key),
                              static_cast<bool>(std::get<1>(key)));
  }
 
  SmallVector<OpenBundleType::BundleElement, 4> elements;
  SmallVector<uint64_t, 4> fieldIDs;
  uint64_t maxFieldID;
 
  /// This holds the bits for the type's recursive properties, and can hold a
  /// pointer to a passive version of the type.
  RecursiveTypeProperties props;
 
  // Whether this is 'const'.
  char isConst;
};
 
OpenBundleType OpenBundleType::get(MLIRContext *context,
                                   ArrayRef<BundleElement> elements,
                                   bool isConst) {
  return Base::get(context, elements, isConst);
}
 
auto OpenBundleType::getElements() const -> ArrayRef<BundleElement> {
  return getImpl()->elements;
}
 
/// Return a pair with the 'isPassive' and 'containsAnalog' bits.
RecursiveTypeProperties OpenBundleType::getRecursiveTypeProperties() const {
  return getImpl()->props;
}
 
OpenBundleType OpenBundleType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), getElements(), isConst);
}
 
std::optional<unsigned> OpenBundleType::getElementIndex(StringAttr name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
std::optional<unsigned> OpenBundleType::getElementIndex(StringRef name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name.getValue() == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
StringAttr OpenBundleType::getElementNameAttr(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index].name;
}
 
StringRef OpenBundleType::getElementName(size_t index) {
  return getElementNameAttr(index).getValue();
}
 
std::optional<OpenBundleType::BundleElement>
OpenBundleType::getElement(StringAttr name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
std::optional<OpenBundleType::BundleElement>
OpenBundleType::getElement(StringRef name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
/// Look up an element by index.
OpenBundleType::BundleElement OpenBundleType::getElement(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index];
}
 
OpenBundleType::ElementType OpenBundleType::getElementType(StringAttr name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
OpenBundleType::ElementType OpenBundleType::getElementType(StringRef name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
OpenBundleType::ElementType OpenBundleType::getElementType(size_t index) const {
  assert(index < getNumElements() &&
         "index must be less than number of fields in bundle");
  return getElements()[index].type;
}
 
uint64_t OpenBundleType::getFieldID(uint64_t index) const {
  return getImpl()->fieldIDs[index];
}
 
uint64_t OpenBundleType::getIndexForFieldID(uint64_t fieldID) const {
  assert(!getElements().empty() && "Bundle must have >0 fields");
  auto fieldIDs = getImpl()->fieldIDs;
  auto *it = std::prev(llvm::upper_bound(fieldIDs, fieldID));
  return std::distance(fieldIDs.begin(), it);
}
 
std::pair<uint64_t, uint64_t>
OpenBundleType::getIndexAndSubfieldID(uint64_t fieldID) const {
  auto index = getIndexForFieldID(fieldID);
  auto elementFieldID = getFieldID(index);
  return {index, fieldID - elementFieldID};
}
 
std::pair<Type, uint64_t>
OpenBundleType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
  auto subfieldIndex = getIndexForFieldID(fieldID);
  auto subfieldType = getElementType(subfieldIndex);
  auto subfieldID = fieldID - getFieldID(subfieldIndex);
  return {subfieldType, subfieldID};
}
 
uint64_t OpenBundleType::getMaxFieldID() const { return getImpl()->maxFieldID; }
 
std::pair<uint64_t, bool>
OpenBundleType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  auto childRoot = getFieldID(index);
  auto rangeEnd = index + 1 >= getNumElements() ? getMaxFieldID()
                                                : (getFieldID(index + 1) - 1);
  return std::make_pair(fieldID - childRoot,
                        fieldID >= childRoot && fieldID <= rangeEnd);
}
 
bool OpenBundleType::isConst() const { return getImpl()->isConst; }
 
OpenBundleType::ElementType
OpenBundleType::getElementTypePreservingConst(size_t index) {
  auto type = getElementType(index);
  // TODO: ConstTypeInterface / Trait ?
  return TypeSwitch<FIRRTLType, ElementType>(type)
      .Case<FIRRTLBaseType, OpenBundleType, OpenVectorType>([&](auto type) {
        return type.getConstType(type.isConst() || isConst());
      })
      .Default(type);
}
 
LogicalResult
OpenBundleType::verify(function_ref<InFlightDiagnostic()> emitErrorFn,
                       ArrayRef<BundleElement> elements, bool isConst) {
  SmallPtrSet<StringAttr, 4> nameSet;
  for (auto &element : elements) {
    if (!nameSet.insert(element.name).second)
      return emitErrorFn() << "duplicate field name " << element.name
                           << " in openbundle";
    if (FIRRTLType(element.type).containsReference() && isConst)
      return emitErrorFn()
             << "'const' bundle cannot have references, but element "
             << element.name << " has type " << element.type;
    if (type_isa<LHSType>(element.type))
      return emitErrorFn() << "bundle element " << element.name
                           << " cannot have a left-hand side type";
  }
 
  return success();
}
 
//===----------------------------------------------------------------------===//
// FVectorType
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::FVectorTypeStorage
    : detail::FIRRTLBaseTypeStorage {
  using KeyTy = std::tuple<FIRRTLBaseType, size_t, char>;
 
  FVectorTypeStorage(FIRRTLBaseType elementType, size_t numElements,
                     bool isConst)
      : detail::FIRRTLBaseTypeStorage(isConst), elementType(elementType),
        numElements(numElements),
        props(elementType.getRecursiveTypeProperties()) {
    props.containsConst |= isConst;
  }
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(elementType, numElements, isConst); }
 
  static FVectorTypeStorage *construct(TypeStorageAllocator &allocator,
                                       KeyTy key) {
    return new (allocator.allocate<FVectorTypeStorage>())
        FVectorTypeStorage(std::get<0>(key), std::get<1>(key),
                           static_cast<bool>(std::get<2>(key)));
  }
 
  FIRRTLBaseType elementType;
  size_t numElements;
 
  /// This holds the bits for the type's recursive properties, and can hold a
  /// pointer to a passive version of the type.
  RecursiveTypeProperties props;
  FIRRTLBaseType passiveType;
  FIRRTLBaseType anonymousType;
};
 
FVectorType FVectorType::get(FIRRTLBaseType elementType, size_t numElements,
                             bool isConst) {
  return Base::get(elementType.getContext(), elementType, numElements, isConst);
}
 
FIRRTLBaseType FVectorType::getElementType() const {
  return getImpl()->elementType;
}
 
size_t FVectorType::getNumElements() const { return getImpl()->numElements; }
 
/// Return the recursive properties of the type.
RecursiveTypeProperties FVectorType::getRecursiveTypeProperties() const {
  return getImpl()->props;
}
 
/// Return this type with any flip types recursively removed from itself.
FIRRTLBaseType FVectorType::getPassiveType() {
  auto *impl = getImpl();
 
  // If we've already determined and cached the passive type, use it.
  if (impl->passiveType)
    return impl->passiveType;
 
  // If this type is already passive, return it and remember for next time.
  if (impl->elementType.getRecursiveTypeProperties().isPassive)
    return impl->passiveType = *this;
 
  // Otherwise, rebuild a passive version.
  auto passiveType = FVectorType::get(getElementType().getPassiveType(),
                                      getNumElements(), isConst());
  impl->passiveType = passiveType;
  return passiveType;
}
 
FVectorType FVectorType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getElementType(), getNumElements(), isConst);
}
 
FVectorType FVectorType::getAllConstDroppedType() {
  if (!containsConst())
    return *this;
  return get(getElementType().getAllConstDroppedType(), getNumElements(),
             false);
}
 
/// Return this type with any type aliases recursively removed from itself.
FIRRTLBaseType FVectorType::getAnonymousType() {
  auto *impl = getImpl();
 
  if (impl->anonymousType)
    return impl->anonymousType;
 
  // If this type is already anonymous, return it and remember for next time.
  if (!impl->props.containsTypeAlias)
    return impl->anonymousType = *this;
 
  // Otherwise, rebuild an anonymous version.
  auto anonymousType = FVectorType::get(getElementType().getAnonymousType(),
                                        getNumElements(), isConst());
  impl->anonymousType = anonymousType;
  return anonymousType;
}
 
uint64_t FVectorType::getFieldID(uint64_t index) const {
  return 1 + index * (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
uint64_t FVectorType::getIndexForFieldID(uint64_t fieldID) const {
  assert(fieldID && "fieldID must be at least 1");
  // Divide the field ID by the number of fieldID's per element.
  return (fieldID - 1) / (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
std::pair<uint64_t, uint64_t>
FVectorType::getIndexAndSubfieldID(uint64_t fieldID) const {
  auto index = getIndexForFieldID(fieldID);
  auto elementFieldID = getFieldID(index);
  return {index, fieldID - elementFieldID};
}
 
std::pair<Type, uint64_t>
FVectorType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
  return {getElementType(), getIndexAndSubfieldID(fieldID).second};
}
 
uint64_t FVectorType::getMaxFieldID() const {
  return getNumElements() *
         (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
std::pair<uint64_t, bool>
FVectorType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  auto childRoot = getFieldID(index);
  auto rangeEnd =
      index >= getNumElements() ? getMaxFieldID() : (getFieldID(index + 1) - 1);
  return std::make_pair(fieldID - childRoot,
                        fieldID >= childRoot && fieldID <= rangeEnd);
}
 
bool FVectorType::isConst() const { return getImpl()->isConst; }
 
FVectorType::ElementType FVectorType::getElementTypePreservingConst() {
  auto type = getElementType();
  return type.getConstType(type.isConst() || isConst());
}
 
//===----------------------------------------------------------------------===//
// OpenVectorType
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::OpenVectorTypeStorage : mlir::TypeStorage {
  using KeyTy = std::tuple<FIRRTLType, size_t, char>;
 
  OpenVectorTypeStorage(FIRRTLType elementType, size_t numElements,
                        bool isConst)
      : elementType(elementType), numElements(numElements),
        isConst(static_cast<char>(isConst)) {
    props = elementType.getRecursiveTypeProperties();
    props.containsConst |= isConst;
  }
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(elementType, numElements, isConst); }
 
  static OpenVectorTypeStorage *construct(TypeStorageAllocator &allocator,
                                          KeyTy key) {
    return new (allocator.allocate<OpenVectorTypeStorage>())
        OpenVectorTypeStorage(std::get<0>(key), std::get<1>(key),
                              static_cast<bool>(std::get<2>(key)));
  }
 
  FIRRTLType elementType;
  size_t numElements;
 
  RecursiveTypeProperties props;
  char isConst;
};
 
OpenVectorType OpenVectorType::get(FIRRTLType elementType, size_t numElements,
                                   bool isConst) {
  return Base::get(elementType.getContext(), elementType, numElements, isConst);
}
 
FIRRTLType OpenVectorType::getElementType() const {
  return getImpl()->elementType;
}
 
size_t OpenVectorType::getNumElements() const { return getImpl()->numElements; }
 
/// Return the recursive properties of the type.
RecursiveTypeProperties OpenVectorType::getRecursiveTypeProperties() const {
  return getImpl()->props;
}
 
OpenVectorType OpenVectorType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getElementType(), getNumElements(), isConst);
}
 
uint64_t OpenVectorType::getFieldID(uint64_t index) const {
  return 1 + index * (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
uint64_t OpenVectorType::getIndexForFieldID(uint64_t fieldID) const {
  assert(fieldID && "fieldID must be at least 1");
  // Divide the field ID by the number of fieldID's per element.
  return (fieldID - 1) / (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
std::pair<uint64_t, uint64_t>
OpenVectorType::getIndexAndSubfieldID(uint64_t fieldID) const {
  auto index = getIndexForFieldID(fieldID);
  auto elementFieldID = getFieldID(index);
  return {index, fieldID - elementFieldID};
}
 
std::pair<Type, uint64_t>
OpenVectorType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
  return {getElementType(), getIndexAndSubfieldID(fieldID).second};
}
 
uint64_t OpenVectorType::getMaxFieldID() const {
  // If this is requirement, make ODS constraint or actual elementType.
  return getNumElements() *
         (hw::FieldIdImpl::getMaxFieldID(getElementType()) + 1);
}
 
std::pair<uint64_t, bool>
OpenVectorType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  auto childRoot = getFieldID(index);
  auto rangeEnd =
      index >= getNumElements() ? getMaxFieldID() : (getFieldID(index + 1) - 1);
  return std::make_pair(fieldID - childRoot,
                        fieldID >= childRoot && fieldID <= rangeEnd);
}
 
bool OpenVectorType::isConst() const { return getImpl()->isConst; }
 
OpenVectorType::ElementType OpenVectorType::getElementTypePreservingConst() {
  auto type = getElementType();
  // TODO: ConstTypeInterface / Trait ?
  return TypeSwitch<FIRRTLType, ElementType>(type)
      .Case<FIRRTLBaseType, OpenBundleType, OpenVectorType>([&](auto type) {
        return type.getConstType(type.isConst() || isConst());
      })
      .Default(type);
}
 
LogicalResult
OpenVectorType::verify(function_ref<InFlightDiagnostic()> emitErrorFn,
                       FIRRTLType elementType, size_t numElements,
                       bool isConst) {
  if (elementType.containsReference() && isConst)
    return emitErrorFn() << "vector cannot be const with references";
  if (type_isa<LHSType>(elementType))
    return emitErrorFn() << "vector cannot have a left-hand side type";
  return success();
}
 
//===----------------------------------------------------------------------===//
// FEnum Type
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::FEnumTypeStorage : detail::FIRRTLBaseTypeStorage {
  using KeyTy = std::tuple<ArrayRef<FEnumType::EnumElement>, char>;
 
  FEnumTypeStorage(ArrayRef<FEnumType::EnumElement> elements, bool isConst)
      : detail::FIRRTLBaseTypeStorage(isConst),
        elements(elements.begin(), elements.end()) {
    RecursiveTypeProperties props{true,  false, false, isConst,
                                  false, false, false};
    dataSize = 0;
    for (auto &element : elements) {
      auto type = element.type;
      auto eltInfo = type.getRecursiveTypeProperties();
      props.containsConst |= eltInfo.containsConst;
      props.containsTypeAlias |= eltInfo.containsTypeAlias;
 
      dataSize = std::max((size_t)type.getBitWidthOrSentinel(), dataSize);
    }
    recProps = props;
  }
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(elements, isConst); }
 
  static llvm::hash_code hashKey(const KeyTy &key) {
    return llvm::hash_value(key);
  }
 
  static FEnumTypeStorage *construct(TypeStorageAllocator &allocator,
                                     KeyTy key) {
    return new (allocator.allocate<FEnumTypeStorage>())
        FEnumTypeStorage(std::get<0>(key), static_cast<bool>(std::get<1>(key)));
  }
 
  SmallVector<FEnumType::EnumElement, 4> elements;
  RecursiveTypeProperties recProps;
  size_t dataSize;
  FIRRTLBaseType anonymousType;
};
 
FEnumType FEnumType::get(::mlir::MLIRContext *context,
                         ArrayRef<EnumElement> elements, bool isConst) {
  return Base::get(context, elements, isConst);
}
 
ArrayRef<FEnumType::EnumElement> FEnumType::getElements() const {
  return getImpl()->elements;
}
 
FEnumType FEnumType::getConstType(bool isConst) const {
  return get(getContext(), getElements(), isConst);
}
 
FEnumType FEnumType::getAllConstDroppedType() {
  if (!containsConst())
    return *this;
 
  SmallVector<EnumElement> constDroppedElements(
      llvm::map_range(getElements(), [](EnumElement element) {
        element.type = element.type.getAllConstDroppedType();
        return element;
      }));
  return get(getContext(), constDroppedElements, false);
}
 
/// Return a pair with the 'isPassive' and 'containsAnalog' bits.
RecursiveTypeProperties FEnumType::getRecursiveTypeProperties() const {
  return getImpl()->recProps;
}
 
std::optional<unsigned> FEnumType::getElementIndex(StringAttr name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
size_t FEnumType::getBitWidth() { return getDataWidth() + getTagWidth(); }
 
size_t FEnumType::getDataWidth() { return getImpl()->dataSize; }
 
size_t FEnumType::getTagWidth() {
  if (getElements().size() == 0)
    return 0;
  // Each tag has the same type.
  return cast<IntegerType>(getElements()[0].value.getType()).getWidth();
}
 
std::optional<unsigned> FEnumType::getElementIndex(StringRef name) {
  for (const auto &it : llvm::enumerate(getElements())) {
    auto element = it.value();
    if (element.name.getValue() == name) {
      return unsigned(it.index());
    }
  }
  return std::nullopt;
}
 
StringAttr FEnumType::getElementNameAttr(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in enum");
  return getElements()[index].name;
}
 
StringRef FEnumType::getElementName(size_t index) {
  return getElementNameAttr(index).getValue();
}
 
IntegerAttr FEnumType::getElementValueAttr(size_t index) {
  return getElements()[index].value;
}
 
APInt FEnumType::getElementValue(size_t index) {
  return getElementValueAttr(index).getValue();
}
 
FIRRTLBaseType FEnumType::getElementType(size_t index) {
  return getElements()[index].type;
}
 
std::optional<FEnumType::EnumElement> FEnumType::getElement(StringAttr name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
std::optional<FEnumType::EnumElement> FEnumType::getElement(StringRef name) {
  if (auto maybeIndex = getElementIndex(name))
    return getElements()[*maybeIndex];
  return std::nullopt;
}
 
/// Look up an element by index.
FEnumType::EnumElement FEnumType::getElement(size_t index) {
  assert(index < getNumElements() &&
         "index must be less than number of fields in enum");
  return getElements()[index];
}
 
FIRRTLBaseType FEnumType::getElementType(StringAttr name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
FIRRTLBaseType FEnumType::getElementType(StringRef name) {
  auto element = getElement(name);
  return element ? element->type : FIRRTLBaseType();
}
 
FIRRTLBaseType FEnumType::getElementType(size_t index) const {
  assert(index < getNumElements() &&
         "index must be less than number of fields in enum");
  return getElements()[index].type;
}
 
FIRRTLBaseType FEnumType::getElementTypePreservingConst(size_t index) {
  auto type = getElementType(index);
  return type.getConstType(type.isConst() || isConst());
}
 
LogicalResult FEnumType::verify(function_ref<InFlightDiagnostic()> emitErrorFn,
                                ArrayRef<EnumElement> elements, bool isConst) {
  bool first = true;
  IntegerAttr previous;
  SmallPtrSet<Attribute, 4> nameSet;
 
  for (auto &elt : elements) {
    auto r = elt.type.getRecursiveTypeProperties();
    if (!r.isPassive)
      return emitErrorFn() << "enum field " << elt.name << " not passive";
    if (r.containsAnalog)
      return emitErrorFn() << "enum field " << elt.name << " contains analog";
    if (r.hasUninferredWidth)
      return emitErrorFn() << "enum field " << elt.name
                           << " has uninferred width";
    if (r.hasUninferredReset)
      return emitErrorFn() << "enum field " << elt.name
                           << " has uninferred reset";
    if (r.containsConst && !isConst)
      return emitErrorFn() << "enum with 'const' elements must be 'const'";
    // Ensure that each tag has a unique name.
    if (!nameSet.insert(elt.name).second)
      return emitErrorFn() << "duplicate variant name " << elt.name
                           << " in enum";
    // Ensure that each tag is increasing and unique.
    if (first) {
      previous = elt.value;
      first = false;
    } else {
      auto current = elt.value;
      if (previous.getType() != current.getType())
        return emitErrorFn() << "enum variant " << elt.name << " has type"
                             << current.getType()
                             << " which is different than previous variant "
                             << previous.getType();
 
      if (previous.getValue().getBitWidth() != current.getValue().getBitWidth())
        return emitErrorFn() << "enum variant " << elt.name << " has bitwidth"
                             << current.getValue().getBitWidth()
                             << " which is different than previous variant "
                             << previous.getValue().getBitWidth();
      if (previous.getValue().uge(current.getValue()))
        return emitErrorFn()
               << "enum variant " << elt.name << " has value " << current
               << " which is not greater than previous variant " << previous;
    }
    // TODO: exclude reference containing
  }
  return success();
}
 
/// Return this type with any type aliases recursively removed from itself.
FIRRTLBaseType FEnumType::getAnonymousType() {
  auto *impl = getImpl();
 
  if (impl->anonymousType)
    return impl->anonymousType;
 
  if (!impl->recProps.containsTypeAlias)
    return impl->anonymousType = *this;
 
  SmallVector<FEnumType::EnumElement, 4> elements;
 
  for (auto element : getElements())
    elements.push_back(
        {element.name, element.value, element.type.getAnonymousType()});
  return impl->anonymousType = FEnumType::get(getContext(), elements);
}
 
//===----------------------------------------------------------------------===//
// BaseTypeAliasType
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::BaseTypeAliasStorage
    : circt::firrtl::detail::FIRRTLBaseTypeStorage {
  using KeyTy = std::tuple<StringAttr, FIRRTLBaseType>;
 
  BaseTypeAliasStorage(StringAttr name, FIRRTLBaseType innerType)
      : detail::FIRRTLBaseTypeStorage(innerType.isConst()), name(name),
        innerType(innerType) {}
 
  bool operator==(const KeyTy &key) const { return key == getAsKey(); }
 
  KeyTy getAsKey() const { return KeyTy(name, innerType); }
 
  static llvm::hash_code hashKey(const KeyTy &key) {
    return llvm::hash_value(key);
  }
 
  static BaseTypeAliasStorage *construct(TypeStorageAllocator &allocator,
                                         KeyTy key) {
    return new (allocator.allocate<BaseTypeAliasStorage>())
        BaseTypeAliasStorage(std::get<0>(key), std::get<1>(key));
  }
  StringAttr name;
  FIRRTLBaseType innerType;
  FIRRTLBaseType anonymousType;
};
 
auto BaseTypeAliasType::get(StringAttr name, FIRRTLBaseType innerType)
    -> BaseTypeAliasType {
  return Base::get(name.getContext(), name, innerType);
}
 
auto BaseTypeAliasType::getName() const -> StringAttr {
  return getImpl()->name;
}
 
auto BaseTypeAliasType::getInnerType() const -> FIRRTLBaseType {
  return getImpl()->innerType;
}
 
FIRRTLBaseType BaseTypeAliasType::getAnonymousType() {
  auto *impl = getImpl();
  if (impl->anonymousType)
    return impl->anonymousType;
  return impl->anonymousType = getInnerType().getAnonymousType();
}
 
FIRRTLBaseType BaseTypeAliasType::getPassiveType() {
  return getModifiedType(getInnerType().getPassiveType());
}
 
RecursiveTypeProperties BaseTypeAliasType::getRecursiveTypeProperties() const {
  auto rtp = getInnerType().getRecursiveTypeProperties();
  rtp.containsTypeAlias = true;
  return rtp;
}
 
// If a given `newInnerType` is identical to innerType, return `*this`
// because we can reuse the type alias. Otherwise return `newInnerType`.
FIRRTLBaseType
BaseTypeAliasType::getModifiedType(FIRRTLBaseType newInnerType) const {
  if (newInnerType == getInnerType())
    return *this;
  return newInnerType;
}
 
// FieldIDTypeInterface implementation.
FIRRTLBaseType BaseTypeAliasType::getAllConstDroppedType() {
  return getModifiedType(getInnerType().getAllConstDroppedType());
}
 
FIRRTLBaseType BaseTypeAliasType::getConstType(bool isConst) const {
  return getModifiedType(getInnerType().getConstType(isConst));
}
 
std::pair<Type, uint64_t>
BaseTypeAliasType::getSubTypeByFieldID(uint64_t fieldID) const {
  return hw::FieldIdImpl::getSubTypeByFieldID(getInnerType(), fieldID);
}
 
uint64_t BaseTypeAliasType::getMaxFieldID() const {
  return hw::FieldIdImpl::getMaxFieldID(getInnerType());
}
 
std::pair<uint64_t, bool>
BaseTypeAliasType::projectToChildFieldID(uint64_t fieldID,
                                         uint64_t index) const {
  return hw::FieldIdImpl::projectToChildFieldID(getInnerType(), fieldID, index);
}
 
uint64_t BaseTypeAliasType::getIndexForFieldID(uint64_t fieldID) const {
  return hw::FieldIdImpl::getIndexForFieldID(getInnerType(), fieldID);
}
 
uint64_t BaseTypeAliasType::getFieldID(uint64_t index) const {
  return hw::FieldIdImpl::getFieldID(getInnerType(), index);
}
 
std::pair<uint64_t, uint64_t>
BaseTypeAliasType::getIndexAndSubfieldID(uint64_t fieldID) const {
  return hw::FieldIdImpl::getIndexAndSubfieldID(getInnerType(), fieldID);
}
 
//===----------------------------------------------------------------------===//
// LHSType
//===----------------------------------------------------------------------===//
 
LHSType LHSType::get(FIRRTLBaseType type) {
  return LHSType::get(type.getContext(), type);
}
 
LogicalResult LHSType::verify(function_ref<InFlightDiagnostic()> emitError,
                              FIRRTLBaseType type) {
  if (type.containsAnalog())
    return emitError() << "lhs type cannot contain an AnalogType";
  if (!type.isPassive())
    return emitError() << "lhs type cannot contain a non-passive type";
  if (type.containsReference())
    return emitError() << "lhs type cannot contain a reference";
  if (type_isa<LHSType>(type))
    return emitError() << "lhs type cannot contain a lhs type";
 
  return success();
}
 
//===----------------------------------------------------------------------===//
// RefType
//===----------------------------------------------------------------------===//
 
auto RefType::get(FIRRTLBaseType type, bool forceable, SymbolRefAttr layer)
    -> RefType {
  return Base::get(type.getContext(), type, forceable, layer);
}
 
auto RefType::verify(function_ref<InFlightDiagnostic()> emitErrorFn,
                     FIRRTLBaseType base, bool forceable, SymbolRefAttr layer)
    -> LogicalResult {
  if (!base.isPassive())
    return emitErrorFn() << "reference base type must be passive";
  if (forceable && base.containsConst())
    return emitErrorFn()
           << "forceable reference base type cannot contain const";
  return success();
}
 
RecursiveTypeProperties RefType::getRecursiveTypeProperties() const {
  auto rtp = getType().getRecursiveTypeProperties();
  rtp.containsReference = true;
  // References are not "passive", per FIRRTL spec.
  rtp.isPassive = false;
  return rtp;
}
 
//===----------------------------------------------------------------------===//
// AnalogType
//===----------------------------------------------------------------------===//
 
AnalogType AnalogType::get(mlir::MLIRContext *context) {
  return AnalogType::get(context, -1, false);
}
 
AnalogType AnalogType::get(mlir::MLIRContext *context,
                           std::optional<int32_t> width, bool isConst) {
  return AnalogType::get(context, width ? *width : -1, isConst);
}
 
LogicalResult AnalogType::verify(function_ref<InFlightDiagnostic()> emitError,
                                 int32_t widthOrSentinel, bool isConst) {
  if (widthOrSentinel < -1)
    return emitError() << "invalid width";
  return success();
}
 
int32_t AnalogType::getWidthOrSentinel() const { return getImpl()->width; }
 
AnalogType AnalogType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), getWidthOrSentinel(), isConst);
}
 
//===----------------------------------------------------------------------===//
// ClockType
//===----------------------------------------------------------------------===//
 
ClockType ClockType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), isConst);
}
 
//===----------------------------------------------------------------------===//
// ResetType
//===----------------------------------------------------------------------===//
 
ResetType ResetType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), isConst);
}
 
//===----------------------------------------------------------------------===//
// AsyncResetType
//===----------------------------------------------------------------------===//
 
AsyncResetType AsyncResetType::getConstType(bool isConst) const {
  if (isConst == this->isConst())
    return *this;
  return get(getContext(), isConst);
}
 
//===----------------------------------------------------------------------===//
// ClassType
//===----------------------------------------------------------------------===//
 
struct circt::firrtl::detail::ClassTypeStorage : mlir::TypeStorage {
  using KeyTy = std::tuple<FlatSymbolRefAttr, ArrayRef<ClassElement>>;
 
  static ClassTypeStorage *construct(TypeStorageAllocator &allocator,
                                     KeyTy key) {
    auto name = std::get<0>(key);
    auto elements = allocator.copyInto(std::get<1>(key));
 
    // build the field ID table
    SmallVector<uint64_t, 4> ids;
    uint64_t id = 0;
    ids.reserve(elements.size());
    for (auto &element : elements) {
      id += 1;
      ids.push_back(id);
      id += hw::FieldIdImpl::getMaxFieldID(element.type);
    }
 
    auto fieldIDs = allocator.copyInto(ArrayRef(ids));
    auto maxFieldID = id;
 
    return new (allocator.allocate<ClassTypeStorage>())
        ClassTypeStorage(name, elements, fieldIDs, maxFieldID);
  }
 
  ClassTypeStorage(FlatSymbolRefAttr name, ArrayRef<ClassElement> elements,
                   ArrayRef<uint64_t> fieldIDs, uint64_t maxFieldID)
      : name(name), elements(elements), fieldIDs(fieldIDs),
        maxFieldID(maxFieldID) {}
 
  bool operator==(const KeyTy &key) const { return getAsKey() == key; }
 
  KeyTy getAsKey() const { return KeyTy(name, elements); }
 
  FlatSymbolRefAttr name;
  ArrayRef<ClassElement> elements;
  ArrayRef<uint64_t> fieldIDs;
  uint64_t maxFieldID;
};
 
ClassType ClassType::get(FlatSymbolRefAttr name,
                         ArrayRef<ClassElement> elements) {
  return get(name.getContext(), name, elements);
}
 
StringRef ClassType::getName() const {
  return getNameAttr().getAttr().getValue();
}
 
FlatSymbolRefAttr ClassType::getNameAttr() const { return getImpl()->name; }
 
ArrayRef<ClassElement> ClassType::getElements() const {
  return getImpl()->elements;
}
 
const ClassElement &ClassType::getElement(IntegerAttr index) const {
  return getElement(index.getValue().getZExtValue());
}
 
const ClassElement &ClassType::getElement(size_t index) const {
  return getElements()[index];
}
 
std::optional<uint64_t> ClassType::getElementIndex(StringRef fieldName) const {
  for (const auto [i, e] : llvm::enumerate(getElements()))
    if (fieldName == e.name)
      return i;
  return {};
}
 
void ClassType::printInterface(AsmPrinter &p) const {
  p.printSymbolName(getName());
  p << "(";
  bool first = true;
  for (const auto &element : getElements()) {
    if (!first)
      p << ", ";
    p << element.direction << " ";
    p.printKeywordOrString(element.name);
    p << ": " << element.type;
    first = false;
  }
  p << ")";
}
 
uint64_t ClassType::getFieldID(uint64_t index) const {
  return getImpl()->fieldIDs[index];
}
 
uint64_t ClassType::getIndexForFieldID(uint64_t fieldID) const {
  assert(!getElements().empty() && "Class must have >0 fields");
  auto fieldIDs = getImpl()->fieldIDs;
  auto *it = std::prev(llvm::upper_bound(fieldIDs, fieldID));
  return std::distance(fieldIDs.begin(), it);
}
 
std::pair<uint64_t, uint64_t>
ClassType::getIndexAndSubfieldID(uint64_t fieldID) const {
  auto index = getIndexForFieldID(fieldID);
  auto elementFieldID = getFieldID(index);
  return {index, fieldID - elementFieldID};
}
 
std::pair<Type, uint64_t>
ClassType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
  auto subfieldIndex = getIndexForFieldID(fieldID);
  auto subfieldType = getElement(subfieldIndex).type;
  auto subfieldID = fieldID - getFieldID(subfieldIndex);
  return {subfieldType, subfieldID};
}
 
uint64_t ClassType::getMaxFieldID() const { return getImpl()->maxFieldID; }
 
std::pair<uint64_t, bool>
ClassType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  auto childRoot = getFieldID(index);
  auto rangeEnd = index + 1 >= getNumElements() ? getMaxFieldID()
                                                : (getFieldID(index + 1) - 1);
  return std::make_pair(fieldID - childRoot,
                        fieldID >= childRoot && fieldID <= rangeEnd);
}
 
namespace {
/// Helper to parse interface-like types (ClassType, DomainType).
/// This encapsulates the common pattern of parsing @SymbolName(field, field,
/// ...)
struct InterfaceParser {
  AsmParser &parser;
 
  InterfaceParser(AsmParser &parser) : parser(parser) {}
 
  /// Parse the common structure: @SymbolName(field, field, ...)
  template <typename FieldContainer>
  ParseResult parse(
      function_ref<ParseResult(FieldContainer &, AsmParser &parser)> parseField,
      StringAttr &symbolName, FieldContainer &fields) {
 
    if (parser.parseSymbolName(symbolName))
      return failure();
 
    // Parse required parentheses
    if (parser.parseLParen())
      return failure();
 
    // Check for empty list (immediate closing paren)
    if (failed(parser.parseOptionalRParen())) {
      auto parseElement = [&]() -> ParseResult {
        return parseField(fields, parser);
      };
 
      if (parser.parseCommaSeparatedList(parseElement) || parser.parseRParen())
        return failure();
    }
 
    return success();
  }
};
} // namespace
 
ParseResult ClassType::parseInterface(AsmParser &parser, ClassType &result) {
  InterfaceParser helper(parser);
 
  auto parseField = [](SmallVector<ClassElement> &elements,
                       AsmParser &parser) -> ParseResult {
    // Parse port direction.
    Direction direction;
    if (succeeded(parser.parseOptionalKeyword("out")))
      direction = Direction::Out;
    else if (succeeded(parser.parseKeyword("in", "or 'out'")))
      direction = Direction::In;
    else
      return failure();
 
    // Parse port name.
    std::string keyword;
    if (parser.parseKeywordOrString(&keyword))
      return failure();
    StringAttr name = StringAttr::get(parser.getContext(), keyword);
 
    // Parse port type.
    Type type;
    if (parser.parseColonType(type))
      return failure();
 
    elements.emplace_back(name, type, direction);
    return success();
  };
 
  StringAttr symbolName;
  SmallVector<ClassElement> elements;
  if (helper.parse<SmallVector<ClassElement>>(parseField, symbolName, elements))
    return failure();
 
  result = ClassType::get(FlatSymbolRefAttr::get(symbolName), elements);
  return success();
}
 
//===----------------------------------------------------------------------===//
// DomainType
//===----------------------------------------------------------------------===//
 
ParseResult DomainType::parseInterface(AsmParser &parser, DomainType &result) {
  InterfaceParser helper(parser);
 
  auto parseField = [](SmallVector<Attribute> &fields,
                       AsmParser &parser) -> ParseResult {
    std::string fieldNameStr;
    Type fieldTypeRaw;
    if (parser.parseKeywordOrString(&fieldNameStr) || parser.parseColon() ||
        parser.parseType(fieldTypeRaw))
      return failure();
 
    auto fieldType = dyn_cast<PropertyType>(fieldTypeRaw);
    if (!fieldType)
      return parser.emitError(parser.getCurrentLocation(),
                              "expected property type");
 
    auto fieldName = StringAttr::get(parser.getContext(), fieldNameStr);
    fields.push_back(
        DomainFieldAttr::get(parser.getContext(), fieldName, fieldType));
    return success();
  };
 
  StringAttr symbolName;
  SmallVector<Attribute> fields;
  if (helper.parse<SmallVector<Attribute>>(parseField, symbolName, fields))
    return failure();
 
  result = DomainType::get(FlatSymbolRefAttr::get(symbolName),
                           ArrayAttr::get(parser.getContext(), fields));
  return success();
}
 
DomainType DomainType::get(FlatSymbolRefAttr name, ArrayAttr fields) {
  return Base::get(name.getContext(), name, fields);
}
 
DomainType DomainType::getFromDomainOp(DomainOp domainOp) {
  auto name = FlatSymbolRefAttr::get(domainOp.getNameAttr());
  return DomainType::get(name, domainOp.getFieldsAttr());
}
 
DomainFieldAttr DomainType::getField(size_t index) const {
  assert(index < getNumFields() && "index out of bounds");
  return cast<DomainFieldAttr>(getFields()[index]);
}
 
std::optional<uint64_t> DomainType::getFieldIndex(StringRef fieldName) const {
  for (const auto [i, attr] : llvm::enumerate(getFields())) {
    auto field = cast<DomainFieldAttr>(attr);
    if (fieldName == field.getName())
      return i;
  }
  return {};
}
 
std::pair<Type, uint64_t>
DomainType::getSubTypeByFieldID(uint64_t fieldID) const {
  if (fieldID == 0)
    return {*this, 0};
 
  // Domain fields don't have sub-fieldIDs, so fieldID directly maps to field
  // index
  if (fieldID > getNumFields())
    return {Type(), fieldID};
 
  return {getField(fieldID - 1).getType(), 0};
}
 
uint64_t DomainType::getMaxFieldID() const {
  // Each field gets one fieldID
  return getNumFields();
}
 
std::pair<uint64_t, bool>
DomainType::projectToChildFieldID(uint64_t fieldID, uint64_t index) const {
  // Domain fields are flat, so projection is simple
  if (index >= getNumFields())
    return {0, false};
 
  uint64_t childFieldID = index + 1;
  return {0, fieldID == childFieldID};
}
 
uint64_t DomainType::getFieldID(uint64_t index) const {
  // Domain fields are flat, so fieldID is just index + 1
  assert(index < getNumFields() && "index out of bounds");
  return index + 1;
}
 
uint64_t DomainType::getIndexForFieldID(uint64_t fieldID) const {
  // Domain fields are flat, so index is just fieldID - 1
  assert(fieldID > 0 && fieldID <= getNumFields() && "fieldID out of bounds");
  return fieldID - 1;
}
 
std::pair<uint64_t, uint64_t>
DomainType::getIndexAndSubfieldID(uint64_t fieldID) const {
  // Domain fields are flat (no sub-fields), so subfieldID is always 0
  assert(fieldID > 0 && fieldID <= getNumFields() && "fieldID out of bounds");
  return {fieldID - 1, 0};
}
 
LogicalResult
DomainType::verifySymbolUses(Operation *op,
                             SymbolTableCollection &symbolTable) const {
  // Find the circuit op to look up the domain definition
  auto circuitOp = op->getParentOfType<CircuitOp>();
  if (!circuitOp)
    return op->emitError() << "domain type used outside of a circuit";
 
  // Check that the symbol exists
  auto *symbol = symbolTable.lookupSymbolIn(circuitOp, getName());
  if (!symbol)
    return op->emitError() << "domain type references undefined symbol '"
                           << getName().getValue() << "'";
 
  // Check that the symbol is a domain
  auto domainOp = dyn_cast<DomainOp>(symbol);
  if (!domainOp)
    return op->emitError() << "domain type references symbol '"
                           << getName().getValue() << "' which is not a domain";
 
  // Verify that the domain type fields match the domain definition
  auto expectedFields = domainOp.getFieldsAttr();
  auto actualFields = getFields();
 
  // Check field count
  if (actualFields.size() != expectedFields.size())
    return op->emitError() << "domain type has " << actualFields.size()
                           << " fields but domain definition has "
                           << expectedFields.size() << " fields";
 
  // Check each field
  for (size_t i = 0; i < actualFields.size(); ++i) {
    auto actualField = cast<DomainFieldAttr>(actualFields[i]);
    auto expectedField = cast<DomainFieldAttr>(expectedFields[i]);
 
    // Check field name
    if (actualField.getName() != expectedField.getName())
      return op->emitError() << "domain type field " << i << " has name '"
                             << actualField.getName().getValue()
                             << "' but domain definition expects '"
                             << expectedField.getName().getValue() << "'";
 
    // Check field type
    if (actualField.getType() != expectedField.getType())
      return op->emitError()
             << "domain type field '" << actualField.getName().getValue()
             << "' has type " << actualField.getType()
             << " but domain definition expects " << expectedField.getType();
  }
 
  return success();
}
 
//===----------------------------------------------------------------------===//
// FIRRTLDialect
//===----------------------------------------------------------------------===//
 
void FIRRTLDialect::registerTypes() {
  addTypes<
#define GET_TYPEDEF_LIST
#include "circt/Dialect/FIRRTL/FIRRTLTypes.cpp.inc"
      >();
}
 
// Get the bit width for this type, return None  if unknown. Unlike
// getBitWidthOrSentinel(), this can recursively compute the bitwidth of
// aggregate types. For bundle and vectors, recursively get the width of each
// field element and return the total bit width of the aggregate type. This
// returns None, if any of the bundle fields is a flip type, or ground type with
// unknown bit width.
std::optional<int64_t> firrtl::getBitWidth(FIRRTLBaseType type,
                                           bool ignoreFlip) {
  std::function<std::optional<int64_t>(FIRRTLBaseType)> getWidth =
      [&](FIRRTLBaseType type) -> std::optional<int64_t> {
    return TypeSwitch<FIRRTLBaseType, std::optional<int64_t>>(type)
        .Case<BundleType>([&](BundleType bundle) -> std::optional<int64_t> {
          int64_t width = 0;
          for (auto &elt : bundle) {
            if (elt.isFlip && !ignoreFlip)
              return std::nullopt;
            auto w = getBitWidth(elt.type);
            if (!w.has_value())
              return std::nullopt;
            width += *w;
          }
          return width;
        })
        .Case<FEnumType>([&](FEnumType fenum) -> std::optional<int64_t> {
          int64_t width = 0;
          for (auto &elt : fenum) {
            auto w = getBitWidth(elt.type);
            if (!w.has_value())
              return std::nullopt;
            width = std::max(width, *w);
          }
          return width + fenum.getTagWidth();
        })
        .Case<FVectorType>([&](auto vector) -> std::optional<int64_t> {
          auto w = getBitWidth(vector.getElementType());
          if (!w.has_value())
            return std::nullopt;
          return *w * vector.getNumElements();
        })
        .Case<IntType>([&](IntType iType) { return iType.getWidth(); })
        .Case<ClockType, ResetType, AsyncResetType>([](Type) { return 1; })
        .Default([&](auto t) { return std::nullopt; });
  };
  return getWidth(type);
}