mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Chandler Carruth
8f9609c53b
This is often a (much) better option for this code as we have many types that are just an integer, pointer, or enum of data that would be much more efficient as a by-value parameter. It is also a cleaner design in most cases. One place can't migrate in this way: iterators that use the LLVM CRTP library for filling out iterator methods. The CRTP dispatch expects operators to be actual members, and so those are left as-is in this patch.
75 lines
2.6 KiB
C++
75 lines
2.6 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#ifndef PARSER_PARSE_NODE_KIND_H_
|
|
#define PARSER_PARSE_NODE_KIND_H_
|
|
|
|
#include <cstdint>
|
|
#include <iterator>
|
|
|
|
#include "llvm/ADT/StringRef.h"
|
|
|
|
namespace Carbon {
|
|
|
|
// A class wrapping an enumeration of the different kinds of nodes in the parse
|
|
// tree.
|
|
//
|
|
// Rather than using a raw enumerator for each distinct kind of node produced by
|
|
// the parser, we wrap the enumerator in a class to expose a more rich API
|
|
// including bidirectional mappings to string spellings of the different kinds
|
|
// and any relevant classification.
|
|
//
|
|
// Instances of this type should always be created using the `constexpr` static
|
|
// member functions. These instances are designed specifically to be usable in
|
|
// `case` labels of `switch` statements just like an enumerator would.
|
|
class ParseNodeKind {
|
|
// Note that this must be declared earlier in the class so that its type can
|
|
// be used, for example in the conversion operator.
|
|
enum class KindEnum : uint8_t {
|
|
#define CARBON_PARSE_NODE_KIND(Name) Name,
|
|
#include "parser/parse_node_kind.def"
|
|
};
|
|
|
|
public:
|
|
// The formatting for this macro is weird due to a `clang-format` bug. See
|
|
// https://bugs.llvm.org/show_bug.cgi?id=48320 for details.
|
|
#define CARBON_PARSE_NODE_KIND(Name) \
|
|
static constexpr auto Name()->ParseNodeKind { \
|
|
return ParseNodeKind(KindEnum::Name); \
|
|
}
|
|
#include "parser/parse_node_kind.def"
|
|
|
|
// The default constructor is deleted as objects of this type should always be
|
|
// constructed using the above factory functions for each unique kind.
|
|
ParseNodeKind() = delete;
|
|
|
|
friend auto operator==(ParseNodeKind lhs, ParseNodeKind rhs) -> bool {
|
|
return lhs.kind == rhs.kind;
|
|
}
|
|
friend auto operator!=(ParseNodeKind lhs, ParseNodeKind rhs) -> bool {
|
|
return lhs.kind != rhs.kind;
|
|
}
|
|
|
|
// Gets a friendly name for the token for logging or debugging.
|
|
[[nodiscard]] auto GetName() const -> llvm::StringRef;
|
|
|
|
// Enable conversion to our private enum, including in a `constexpr` context,
|
|
// to enable usage in `switch` and `case`. The enum remains private and
|
|
// nothing else should be using this.
|
|
// NOLINTNEXTLINE(google-explicit-constructor)
|
|
constexpr operator KindEnum() const { return kind; }
|
|
|
|
private:
|
|
constexpr explicit ParseNodeKind(KindEnum k) : kind(k) {}
|
|
|
|
KindEnum kind;
|
|
};
|
|
|
|
// We expect the parse node kind to fit compactly into 8 bits.
|
|
static_assert(sizeof(ParseNodeKind) == 1, "Kind objects include padding!");
|
|
|
|
} // namespace Carbon
|
|
|
|
#endif // PARSER_PARSE_NODE_KIND_H_
|