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https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkins
d96ede7144
A quick check suggests this isn't necessary -- probably because the implicit enum cast is used for comparisons. I think this adds a lot to the boilerplate feel of these types, so if we can remove it there's a lot less sharing to do.
70 lines
2.5 KiB
C++
70 lines
2.5 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_BUILTIN_KIND_H_
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#define CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_BUILTIN_KIND_H_
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#include <cstdint>
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#include "common/ostream.h"
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namespace Carbon {
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class SemanticsBuiltinKind {
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private:
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// Note that this must be declared earlier in the class so that its type can
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// be used, for example in the conversion operator.
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enum class KindEnum : uint8_t {
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#define CARBON_SEMANTICS_BUILTIN_KIND(Name) Name,
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#include "toolchain/semantics/semantics_builtin_kind.def"
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};
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public:
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// The count of enum values excluding Invalid.
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static constexpr uint8_t ValidCount = static_cast<uint8_t>(KindEnum::Invalid);
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// `clang-format` has a bug with spacing around `->` returns in macros. See
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// https://bugs.llvm.org/show_bug.cgi?id=48320 for details.
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#define CARBON_SEMANTICS_BUILTIN_KIND(Name) \
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static constexpr auto Name()->SemanticsBuiltinKind { \
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return SemanticsBuiltinKind(KindEnum::Name); \
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}
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#include "toolchain/semantics/semantics_builtin_kind.def"
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// The default constructor is deleted because objects of this type should
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// always be constructed using the above factory functions for each unique
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// kind.
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SemanticsBuiltinKind() = delete;
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// Gets a friendly name for the token for logging or debugging.
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[[nodiscard]] auto name() const -> llvm::StringRef;
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// Support conversion to and from an int32_t for SemanticNode storage.
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auto AsInt() -> int32_t { return static_cast<int32_t>(kind_); }
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static auto FromInt(int32_t val) -> SemanticsBuiltinKind {
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return SemanticsBuiltinKind(static_cast<KindEnum>(val));
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}
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// Enable conversion to our private enum, including in a `constexpr`
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// context, to enable usage in `switch` and `case`. The enum remains
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// private and nothing else should be using this function.
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// NOLINTNEXTLINE(google-explicit-constructor)
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constexpr operator KindEnum() const { return kind_; }
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void Print(llvm::raw_ostream& out) const { out << name(); }
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private:
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constexpr explicit SemanticsBuiltinKind(KindEnum k) : kind_(k) {}
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KindEnum kind_;
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};
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// We expect the builtin kind to fit compactly into 8 bits.
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static_assert(sizeof(SemanticsBuiltinKind) == 1,
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"Kind objects include padding!");
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_BUILTIN_KIND_H_
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