mirror of
https://github.com/carbon-language/carbon-lang.git
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Richard Smith
c8b42379a4
Semantic handling for use of `T*` and `const T` as types.
There's no way to form values of these types yet, and no conversions for
them are supported.
Factor out the common code to canonicalize types using a folding set,
and switch to using the same folding set for all kinds of type by adding
the kind as part of the folding set key.
Improve type printing to not include the `as type` portion when the type
is printed in a context within another type where a conversion to `type`
is implied, as in `{}*` and pre-existing cases like `({}, {}) as type`
(which we used to print as `({} as type, {} as type}) as type`.
62 lines
2.2 KiB
C++
62 lines
2.2 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_NODE_KIND_H_
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#define CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_NODE_KIND_H_
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#include <cstdint>
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#include "common/enum_base.h"
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#include "llvm/ADT/FoldingSet.h"
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namespace Carbon {
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CARBON_DEFINE_RAW_ENUM_CLASS(SemanticsNodeKind, uint8_t) {
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#define CARBON_SEMANTICS_NODE_KIND(Name) CARBON_RAW_ENUM_ENUMERATOR(Name)
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#include "toolchain/semantics/semantics_node_kind.def"
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};
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// Whether a node is a terminator or part of the terminator sequence. The nodes
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// in a block appear in the order NotTerminator, then TerminatorSequence, then
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// Terminator, which is also the numerical order of these values.
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enum class SemanticsTerminatorKind {
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// This node is not a terminator.
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NotTerminator,
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// This node is not itself a terminator, but forms part of a terminator
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// sequence.
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TerminatorSequence,
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// This node is a terminator.
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Terminator,
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};
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class SemanticsNodeKind : public CARBON_ENUM_BASE(SemanticsNodeKind) {
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public:
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#define CARBON_SEMANTICS_NODE_KIND(Name) CARBON_ENUM_CONSTANT_DECLARATION(Name)
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#include "toolchain/semantics/semantics_node_kind.def"
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using EnumBase::Create;
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// Returns whether this node kind is a code block terminator, such as an
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// unconditional branch instruction, or part of the termination sequence,
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// such as a conditional branch instruction. The termination sequence of a
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// code block appears after all other instructions, and ends with a
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// terminator instruction.
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[[nodiscard]] auto terminator_kind() const -> SemanticsTerminatorKind;
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// Compute a fingerprint for this node kind, allowing its use as part of the
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// key in a `FoldingSet`.
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void Profile(llvm::FoldingSetNodeID& id) { id.AddInteger(AsInt()); }
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};
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#define CARBON_SEMANTICS_NODE_KIND(Name) \
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CARBON_ENUM_CONSTANT_DEFINITION(SemanticsNodeKind, Name)
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#include "toolchain/semantics/semantics_node_kind.def"
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// We expect the node kind to fit compactly into 8 bits.
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static_assert(sizeof(SemanticsNodeKind) == 1, "Kind objects include padding!");
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} // namespace Carbon
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#endif // CARBON_TOOLCHAIN_SEMANTICS_SEMANTICS_NODE_KIND_H_
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