mirror of
https://github.com/carbon-language/carbon-lang.git
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Jon Ross-Perkinsandjosh11b
c44e688e5d
Syntax is proposed in #5017, but has already been discussed with leads. Semantics is left as a TODO. --------- Co-authored-by: josh11b <15258583+josh11b@users.noreply.github.com>
92 lines
2.9 KiB
C++
92 lines
2.9 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_PARSE_NODE_CATEGORY_H_
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#define CARBON_TOOLCHAIN_PARSE_NODE_CATEGORY_H_
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#include "common/ostream.h"
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#include "llvm/ADT/BitmaskEnum.h"
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namespace Carbon::Parse {
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LLVM_ENABLE_BITMASK_ENUMS_IN_NAMESPACE();
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// An X-macro for node categories. Uses should look like:
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//
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// #define CARBON_NODE_CATEGORY_FOR_XYZ(Name) ...
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// CARBON_NODE_CATEGORY(CARBON_NODE_CATEGORY_FOR_XYZ)
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// #undef CARBON_NODE_CATEGORY_FOR_XYZ
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#define CARBON_NODE_CATEGORY(X) \
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X(Decl) \
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X(Expr) \
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X(ImplAs) \
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X(IntConst) \
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X(MemberExpr) \
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X(MemberName) \
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X(Modifier) \
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X(NonExprName) \
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X(PackageName) \
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X(Pattern) \
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X(Requirement) \
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X(Statement)
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// Represents a set of keyword modifiers, using a separate bit per modifier.
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class NodeCategory : public Printable<NodeCategory> {
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private:
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// Use an enum to get incremental bit shifts.
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enum class BitShift : uint8_t {
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#define CARBON_NODE_CATEGORY_FOR_BIT_SHIFT(Name) Name,
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CARBON_NODE_CATEGORY(CARBON_NODE_CATEGORY_FOR_BIT_SHIFT)
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#undef CARBON_NODE_CATEGORY_FOR_BIT_SHIFT
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// For `LLVM_MARK_AS_BITMASK_ENUM`.
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LargestValueMarker,
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};
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public:
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// Provide values as an enum. This doesn't expose these as NodeCategory
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// instances just due to the duplication of declarations that would cause.
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//
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// We expect this to grow, so are using a bigger size than needed.
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// NOLINTNEXTLINE(performance-enum-size)
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enum RawEnumType : uint32_t {
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#define CARBON_NODE_CATEGORY_FOR_BIT_MASK(Name) \
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Name = 1 << static_cast<uint8_t>(BitShift::Name),
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CARBON_NODE_CATEGORY(CARBON_NODE_CATEGORY_FOR_BIT_MASK)
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#undef CARBON_NODE_CATEGORY_FOR_BIT_MASK
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// If you add a new category here, also add it to the Print function.
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None = 0,
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LLVM_MARK_AS_BITMASK_ENUM(
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/*LargestValue=*/1
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<< (static_cast<uint8_t>(BitShift::LargestValueMarker) - 1))
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};
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// Support implicit conversion so that the difference with the member enum is
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// opaque.
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// NOLINTNEXTLINE(google-explicit-constructor)
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constexpr NodeCategory(RawEnumType value) : value_(value) {}
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// Returns true if there's a non-empty set intersection.
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constexpr auto HasAnyOf(NodeCategory other) const -> bool {
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return value_ & other.value_;
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}
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// Returns the set inverse.
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constexpr auto operator~() const -> NodeCategory { return ~value_; }
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friend auto operator==(NodeCategory lhs, NodeCategory rhs) -> bool {
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return lhs.value_ == rhs.value_;
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}
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auto Print(llvm::raw_ostream& out) const -> void;
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private:
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RawEnumType value_;
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};
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} // namespace Carbon::Parse
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#endif // CARBON_TOOLCHAIN_PARSE_NODE_CATEGORY_H_
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