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https://github.com/carbon-language/carbon-lang.git
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Richard Smith
e3c15edb92
Instead of redundantly storing both the `return_type_id` and `return_storage_id`, where the declared return type is just the type of the return storage, store only the `return_storage_id`. Add a convenience property to get the declared return type of the function. In addition to avoiding storing redundant information, this is a preparatory step for an upcoming change for generics support that will make it more expensive and awkward to store `TypeId`s in places other than the type of an instruction.
49 lines
1.5 KiB
C++
49 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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#include "toolchain/sem_ir/function.h"
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#include "toolchain/sem_ir/file.h"
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namespace Carbon::SemIR {
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auto GetCalleeFunction(const File& sem_ir, InstId callee_id) -> CalleeFunction {
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CalleeFunction result = {.function_id = FunctionId::Invalid,
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.self_id = InstId::Invalid,
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.is_error = false};
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if (auto bound_method = sem_ir.insts().TryGetAs<BoundMethod>(callee_id)) {
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result.self_id = bound_method->object_id;
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callee_id = bound_method->function_id;
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}
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// Identify the function we're calling.
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auto val_id = sem_ir.constant_values().Get(callee_id);
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if (!val_id.is_constant()) {
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return result;
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}
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auto val_inst = sem_ir.insts().Get(val_id.inst_id());
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auto struct_val = val_inst.TryAs<StructValue>();
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if (!struct_val) {
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result.is_error = val_inst.type_id() == SemIR::TypeId::Error;
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return result;
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}
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auto fn_type = sem_ir.types().TryGetAs<FunctionType>(struct_val->type_id);
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if (!fn_type) {
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return result;
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}
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result.function_id = fn_type->function_id;
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return result;
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}
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auto Function::declared_return_type(const File& file) const -> TypeId {
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if (!return_storage_id.is_valid()) {
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return TypeId::Invalid;
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}
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return file.insts().Get(return_storage_id).type_id();
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}
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} // namespace Carbon::SemIR
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