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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
4b69264cb1
Add validation that every code block in a function is terminated by a sequence of terminating instructions, and that terminators don't appear anywhere else in code blocks. This required tracking whether we're in a reachable code block. That's done on the fly when we create a new code block; the new `SemanticsNodeBlockId::Unreachable` is used to represent the case where we're not actually creating a code block because we're in unreachable code.
57 lines
2.0 KiB
C++
57 lines
2.0 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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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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};
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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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