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// Copyright (C) 2020-2025 Free Software Foundation, Inc.
// This file is part of GCC.
// GCC is free software; you can redistribute it and/or modify it under
// the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3, or (at your option) any later
// version.
// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
// You should have received a copy of the GNU General Public License
// along with GCC; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#include "rust-derive-copy.h"
#include "rust-ast-full.h"
#include "rust-hir-map.h"
#include "rust-mapping-common.h"
#include "rust-path.h"
namespace Rust {
namespace AST {
DeriveCopy::DeriveCopy (location_t loc)
: DeriveVisitor (loc), expanded (nullptr)
{}
std::unique_ptr<AST::Item>
DeriveCopy::go (Item &item)
{
item.accept_vis (*this);
rust_assert (expanded);
return std::move (expanded);
}
std::unique_ptr<Item>
DeriveCopy::copy_impl (
std::string name,
const std::vector<std::unique_ptr<GenericParam>> &type_generics)
{
auto copy = builder.type_path (LangItem::Kind::COPY);
// we need to build up the generics for this impl block which will be just a
// clone of the types specified ones
//
// for example:
//
// #[derive(Copy)]
// struct Be<T: Copy> { ... }
//
// we need to generate the impl block:
//
// impl<T: Copy> Clone for Be<T>
std::vector<Lifetime> lifetime_args;
std::vector<GenericArg> generic_args;
std::vector<std::unique_ptr<GenericParam>> impl_generics;
for (const auto &generic : type_generics)
{
switch (generic->get_kind ())
{
case GenericParam::Kind::Lifetime: {
LifetimeParam &lifetime_param = (LifetimeParam &) *generic.get ();
Lifetime l = builder.new_lifetime (lifetime_param.get_lifetime ());
lifetime_args.push_back (std::move (l));
auto impl_lifetime_param
= builder.new_lifetime_param (lifetime_param);
impl_generics.push_back (std::move (impl_lifetime_param));
}
break;
case GenericParam::Kind::Type: {
TypeParam &type_param = (TypeParam &) *generic.get ();
std::unique_ptr<Type> associated_type = builder.single_type_path (
type_param.get_type_representation ().as_string ());
GenericArg type_arg
= GenericArg::create_type (std::move (associated_type));
generic_args.push_back (std::move (type_arg));
auto impl_type_param = builder.new_type_param (type_param);
impl_generics.push_back (std::move (impl_type_param));
}
break;
case GenericParam::Kind::Const: {
rust_unreachable ();
// TODO
// const ConstGenericParam *const_param
// = (const ConstGenericParam *) generic.get ();
// std::unique_ptr<Expr> const_expr = nullptr;
// GenericArg type_arg
// = GenericArg::create_const (std::move (const_expr));
// generic_args.push_back (std::move (type_arg));
}
break;
}
}
GenericArgs generic_args_for_self (lifetime_args, generic_args,
{} /*binding args*/, loc);
std::unique_ptr<Type> self_type_path
= impl_generics.empty ()
? builder.single_type_path (name)
: builder.single_generic_type_path (name, generic_args_for_self);
return std::unique_ptr<Item> (
new TraitImpl (std::move (copy), /* unsafe */ false,
/* exclam */ false, /* trait items */ {},
std::move (impl_generics), std::move (self_type_path),
WhereClause::create_empty (), Visibility::create_private (),
{}, {}, loc));
}
void
DeriveCopy::visit_struct (StructStruct &item)
{
expanded = copy_impl (item.get_struct_name ().as_string (),
item.get_generic_params ());
}
void
DeriveCopy::visit_tuple (TupleStruct &item)
{
expanded = copy_impl (item.get_struct_name ().as_string (),
item.get_generic_params ());
}
void
DeriveCopy::visit_enum (Enum &item)
{
expanded = copy_impl (item.get_identifier ().as_string (),
item.get_generic_params ());
}
void
DeriveCopy::visit_union (Union &item)
{
expanded = copy_impl (item.get_identifier ().as_string (),
item.get_generic_params ());
}
} // namespace AST
} // namespace Rust
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