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David Blaikie
4739828cca
Fixes #5186 With @zygoloid's kind assistance, this generalizes the existing non-const lowering of ClassInit, that had previously only handled InitializeFrom, to find other cases - such as a nested ClassInit used to initialize a class member. This refactors the `FindReturnSlotArgForInitializer` from `check/convert.cpp` into `sem_ir/file.{h,cpp}` for use from lowering (since lower doesn't depend on check, which I assume is an intentional layering constraint - so figured it made sense to move it to sem_ir, and found one or two similar-ish utility functions in `sem_ir/file.{h,cpp}`, so figured that was a good spot)
54 lines
1.9 KiB
C++
54 lines
1.9 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_SEM_IR_EXPR_INFO_H_
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#define CARBON_TOOLCHAIN_SEM_IR_EXPR_INFO_H_
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#include <cstdint>
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::SemIR {
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// The expression category of a sem_ir instruction. See /docs/design/values.md
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// for details.
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enum class ExprCategory : int8_t {
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// This instruction does not correspond to an expression, and as such has no
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// category.
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NotExpr,
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// The category of this instruction is not known due to an error.
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Error,
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// This instruction represents a value expression.
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Value,
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// This instruction represents a durable reference expression, that denotes an
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// object that outlives the current full expression context.
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DurableRef,
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// This instruction represents an ephemeral reference expression, that denotes
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// an object that does not outlive the current full expression context.
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EphemeralRef,
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// This instruction represents an initializing expression, that describes how
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// to initialize an object.
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Initializing,
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// This instruction represents a syntactic combination of expressions that are
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// permitted to have different expression categories. This is used for tuple
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// and struct literals, where the subexpressions for different elements can
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// have different categories.
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Mixed,
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Last = Mixed
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};
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// Returns the expression category for an instruction.
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auto GetExprCategory(const File& file, InstId inst_id) -> ExprCategory;
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// Given an initializing expression, find its return slot argument. Returns
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// `None` if there is no return slot, because the initialization is not
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// performed in place.
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auto FindReturnSlotArgForInitializer(const File& sem_ir, InstId init_id)
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-> InstId;
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} // namespace Carbon::SemIR
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#endif // CARBON_TOOLCHAIN_SEM_IR_EXPR_INFO_H_
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