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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
c0b24047dd
Add a new builtin function `cpp.std.initializer_list.make` that takes an array and returns a `std::initializer_list`, initialized to refer to that array. When C++ initialization wants to perform a `std::initializer_list`-from-array construction, synthesize a declaration of a matching builtin function and use that to perform the initialization. Ideally we would specify this conversion as an impl of `ImplicitAs` in the prelude instead of hardcoding it in the interop layer, but unfortunately that's not currently possible, for various reasons -- we can't make the conversion form-generic, we can't deduce the array length from the initializer, and we can't deduce against the arguments of imported C++ class templates yet -- so for now synthesizing a builtin function on demand is the best we can do. Assisted-by: Gemini 3 Pro via Antigravity
37 lines
1.5 KiB
C++
37 lines
1.5 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_LOWER_AGGREGATE_H_
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#define CARBON_TOOLCHAIN_LOWER_AGGREGATE_H_
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/Value.h"
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#include "toolchain/lower/function_context.h"
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#include "toolchain/sem_ir/ids.h"
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namespace Carbon::Lower {
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// Extracts an element of an aggregate, such as a struct, tuple, or class, by
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// index. Depending on the expression category and value representation of the
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// aggregate input, this will either produce a value or a reference.
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auto GetAggregateElement(FunctionContext& context, SemIR::InstId aggr_inst_id,
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SemIR::ElementIndex idx, SemIR::InstId result_inst_id,
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llvm::Twine name) -> llvm::Value*;
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// Emits the value representation for a struct or tuple whose elements are the
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// contents of `refs_id`.
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auto EmitAggregateValueRepr(FunctionContext& context,
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SemIR::InstId value_inst_id,
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SemIR::InstBlockId refs_id) -> llvm::Value*;
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// Emits the initialization for a struct or tuple.
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auto EmitAggregateInitializer(FunctionContext& context,
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SemIR::InstId init_inst_id,
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SemIR::InstBlockId refs_id, llvm::Twine name)
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-> llvm::Value*;
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} // namespace Carbon::Lower
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#endif // CARBON_TOOLCHAIN_LOWER_AGGREGATE_H_
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