mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 20:50:13 +01:00
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
120 lines
4.7 KiB
C++
120 lines
4.7 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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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Twine.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Value.h"
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#include "toolchain/lower/aggregate.h"
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#include "toolchain/lower/function_context.h"
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#include "toolchain/sem_ir/expr_info.h"
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#include "toolchain/sem_ir/file.h"
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#include "toolchain/sem_ir/ids.h"
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#include "toolchain/sem_ir/inst.h"
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#include "toolchain/sem_ir/typed_insts.h"
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namespace Carbon::Lower {
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auto HandleInst(FunctionContext& /*context*/, SemIR::InstId /*inst_id*/,
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SemIR::ClassDecl /*inst*/) -> void {
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// No action to perform.
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}
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static auto GetStructFieldName(FunctionContext::TypeInFile struct_type,
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SemIR::ElementIndex index) -> llvm::StringRef {
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auto struct_type_inst = struct_type.file->types().GetAs<SemIR::AnyStructType>(
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struct_type.type_id);
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auto fields =
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struct_type.file->struct_type_fields().Get(struct_type_inst.fields_id);
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// We intentionally don't add this to the fingerprint because it's only used
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// as an instruction name, and so doesn't affect the semantics of the IR.
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return struct_type.file->names().GetIRBaseName(fields[index.index].name_id);
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::ClassElementAccess inst) -> void {
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// Find the class that we're performing access into.
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auto class_type = context.GetTypeIdOfInst(inst.base_id);
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auto object_repr = FunctionContext::TypeInFile{
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.file = class_type.file,
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.type_id = class_type.file->types().GetObjectRepr(class_type.type_id)};
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// Translate the class field access into a struct access on the object
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// representation.
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context.SetLocal(inst_id, GetAggregateElement(
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context, inst.base_id, inst.index, inst_id,
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GetStructFieldName(object_repr, inst.index)));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::ClassInit inst) -> void {
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context.SetLocal(inst_id,
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EmitAggregateInitializer(context, inst_id, inst.elements_id,
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"class.init"));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::StructAccess inst) -> void {
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auto struct_type = context.GetTypeIdOfInst(inst.struct_id);
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context.SetLocal(inst_id, GetAggregateElement(
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context, inst.struct_id, inst.index, inst_id,
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GetStructFieldName(struct_type, inst.index)));
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}
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auto HandleInst(FunctionContext& /*context*/, SemIR::InstId /*inst_id*/,
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SemIR::StructLiteral /*inst*/) -> void {
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// A StructLiteral should always be converted to a StructInit or StructValue
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// if its value is needed.
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::StructInit inst) -> void {
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context.SetLocal(inst_id,
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EmitAggregateInitializer(context, inst_id, inst.elements_id,
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"struct.init"));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::StructValue inst) -> void {
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auto type = context.GetTypeIdOfInst(inst_id);
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if (auto fn_type =
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type.file->types().TryGetAs<SemIR::FunctionType>(type.type_id)) {
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context.SetLocal(inst_id, context.GetFileContext(type.file).GetFunction(
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fn_type->function_id));
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return;
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}
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context.SetLocal(inst_id,
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EmitAggregateValueRepr(context, inst_id, inst.elements_id));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::TupleAccess inst) -> void {
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context.SetLocal(
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inst_id, GetAggregateElement(context, inst.tuple_id, inst.index, inst_id,
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"tuple.elem"));
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}
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auto HandleInst(FunctionContext& /*context*/, SemIR::InstId /*inst_id*/,
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SemIR::TupleLiteral /*inst*/) -> void {
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// A TupleLiteral should always be converted to a TupleInit or TupleValue if
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// its value is needed.
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::TupleInit inst) -> void {
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context.SetLocal(inst_id,
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EmitAggregateInitializer(context, inst_id, inst.elements_id,
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"tuple.init"));
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}
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auto HandleInst(FunctionContext& context, SemIR::InstId inst_id,
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SemIR::TupleValue inst) -> void {
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context.SetLocal(inst_id,
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EmitAggregateValueRepr(context, inst_id, inst.elements_id));
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}
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} // namespace Carbon::Lower
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