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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.h"
#include "rust-derive-clone.h"
#include "rust-derive-copy.h"
#include "rust-derive-debug.h"
#include "rust-derive-default.h"
#include "rust-derive-eq.h"
#include "rust-derive-partial-eq.h"
#include "rust-derive-hash.h"
namespace Rust {
namespace AST {
DeriveVisitor::DeriveVisitor (location_t loc)
: loc (loc), builder (Builder (loc))
{}
std::vector<std::unique_ptr<Item>>
DeriveVisitor::derive (Item &item, const Attribute &attr,
BuiltinMacro to_derive)
{
auto loc = attr.get_locus ();
switch (to_derive)
{
case BuiltinMacro::Clone:
return vec (DeriveClone (loc).go (item));
case BuiltinMacro::Copy:
return vec (DeriveCopy (loc).go (item));
case BuiltinMacro::Debug:
rust_warning_at (
loc, 0,
"derive(Debug) is not fully implemented yet and has no effect - only a "
"stub implementation will be generated");
return vec (DeriveDebug (loc).go (item));
case BuiltinMacro::Default:
return vec (DeriveDefault (loc).go (item));
case BuiltinMacro::Eq:
return DeriveEq (loc).go (item);
case BuiltinMacro::PartialEq:
return DerivePartialEq (loc).go (item);
case BuiltinMacro::Hash:
return vec (DeriveHash (loc).go (item));
case BuiltinMacro::Ord:
case BuiltinMacro::PartialOrd:
default:
rust_sorry_at (loc, "unimplemented builtin derive macro");
return {};
};
}
DeriveVisitor::ImplGenerics
DeriveVisitor::setup_impl_generics (
const std::string &type_name,
const std::vector<std::unique_ptr<GenericParam>> &type_generics,
tl::optional<std::unique_ptr<TypeParamBound>> &&extra_bound) const
{
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));
std::vector<std::unique_ptr<TypeParamBound>> extra_bounds;
if (extra_bound)
extra_bounds.emplace_back (std::move (*extra_bound));
auto impl_type_param
= builder.new_type_param (type_param, std::move (extra_bounds));
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;
}
}
auto generic_args_for_self
= GenericArgs (lifetime_args, generic_args, {} /*binding args*/, loc);
std::unique_ptr<Type> self_type_path
= impl_generics.empty ()
? builder.single_type_path (type_name)
: builder.single_generic_type_path (type_name, generic_args_for_self);
return ImplGenerics{std::move (self_type_path), std::move (impl_generics)};
}
} // namespace AST
} // namespace Rust
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