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// Copyright (C) 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-eq.h"
#include "rust-ast.h"
#include "rust-expr.h"
#include "rust-item.h"
#include "rust-path.h"
#include "rust-pattern.h"
#include "rust-system.h"
namespace Rust {
namespace AST {
DeriveEq::DeriveEq (location_t loc) : DeriveVisitor (loc) {}
std::vector<std::unique_ptr<AST::Item>>
DeriveEq::go (Item &item)
{
item.accept_vis (*this);
return std::move (expanded);
}
std::unique_ptr<AssociatedItem>
DeriveEq::assert_receiver_is_total_eq_fn (
std::vector<std::unique_ptr<Type>> &&types)
{
auto stmts = std::vector<std::unique_ptr<Stmt>> ();
stmts.emplace_back (assert_param_is_eq ());
for (auto &&type : types)
stmts.emplace_back (assert_type_is_eq (std::move (type)));
auto block = std::unique_ptr<BlockExpr> (
new BlockExpr (std::move (stmts), nullptr, {}, {}, tl::nullopt, loc, loc));
auto self = builder.self_ref_param ();
return builder.function ("assert_receiver_is_total_eq",
vec (std::move (self)), {}, std::move (block));
}
std::unique_ptr<Stmt>
DeriveEq::assert_param_is_eq ()
{
auto eq_bound = std::unique_ptr<TypeParamBound> (
new TraitBound (builder.type_path ({"core", "cmp", "Eq"}, true), loc));
auto sized_bound = std::unique_ptr<TypeParamBound> (
new TraitBound (builder.type_path (LangItem::Kind::SIZED), loc, false,
true /* opening_question_mark */));
auto bounds = vec (std::move (eq_bound), std::move (sized_bound));
auto assert_param_is_eq = "AssertParamIsEq";
auto t = std::unique_ptr<GenericParam> (
new TypeParam (Identifier ("T"), loc, std::move (bounds)));
return builder.struct_struct (
assert_param_is_eq, vec (std::move (t)),
{StructField (
Identifier ("_t"),
builder.single_generic_type_path (
LangItem::Kind::PHANTOM_DATA,
GenericArgs (
{}, {GenericArg::create_type (builder.single_type_path ("T"))}, {})),
Visibility::create_private (), loc)});
}
std::unique_ptr<Stmt>
DeriveEq::assert_type_is_eq (std::unique_ptr<Type> &&type)
{
auto assert_param_is_eq = "AssertParamIsEq";
// AssertParamIsCopy::<Self>
auto assert_param_is_eq_ty
= std::unique_ptr<TypePathSegment> (new TypePathSegmentGeneric (
PathIdentSegment (assert_param_is_eq, loc), false,
GenericArgs ({}, {GenericArg::create_type (std::move (type))}, {}, loc),
loc));
// TODO: Improve this, it's really ugly
auto type_paths = std::vector<std::unique_ptr<TypePathSegment>> ();
type_paths.emplace_back (std::move (assert_param_is_eq_ty));
auto full_path
= std::unique_ptr<Type> (new TypePath ({std::move (type_paths)}, loc));
return builder.let (builder.wildcard (), std::move (full_path));
}
std::vector<std::unique_ptr<Item>>
DeriveEq::eq_impls (
std::unique_ptr<AssociatedItem> &&fn, std::string name,
const std::vector<std::unique_ptr<GenericParam>> &type_generics)
{
// We create two copies of the type-path to avoid duplicate NodeIds
auto eq = builder.type_path ({"core", "cmp", "Eq"}, true);
auto eq_bound
= builder.trait_bound (builder.type_path ({"core", "cmp", "Eq"}, true));
auto steq = builder.type_path (LangItem::Kind::STRUCTURAL_TEQ);
auto trait_items = vec (std::move (fn));
auto eq_generics
= setup_impl_generics (name, type_generics, std::move (eq_bound));
auto steq_generics = setup_impl_generics (name, type_generics);
auto eq_impl = builder.trait_impl (eq, std::move (eq_generics.self_type),
std::move (trait_items),
std::move (eq_generics.impl));
auto steq_impl
= builder.trait_impl (steq, std::move (steq_generics.self_type),
std::move (trait_items),
std::move (steq_generics.impl));
return vec (std::move (eq_impl), std::move (steq_impl));
}
void
DeriveEq::visit_tuple (TupleStruct &item)
{
auto types = std::vector<std::unique_ptr<Type>> ();
for (auto &field : item.get_fields ())
types.emplace_back (field.get_field_type ().clone_type ());
expanded = eq_impls (assert_receiver_is_total_eq_fn (std::move (types)),
item.get_identifier ().as_string (),
item.get_generic_params ());
}
void
DeriveEq::visit_struct (StructStruct &item)
{
auto types = std::vector<std::unique_ptr<Type>> ();
for (auto &field : item.get_fields ())
types.emplace_back (field.get_field_type ().clone_type ());
expanded = eq_impls (assert_receiver_is_total_eq_fn (std::move (types)),
item.get_identifier ().as_string (),
item.get_generic_params ());
}
void
DeriveEq::visit_enum (Enum &item)
{
auto types = std::vector<std::unique_ptr<Type>> ();
for (auto &variant : item.get_variants ())
{
switch (variant->get_enum_item_kind ())
{
case EnumItem::Kind::Identifier:
case EnumItem::Kind::Discriminant:
// nothing to do as they contain no inner types
continue;
case EnumItem::Kind::Tuple: {
auto &tuple = static_cast<EnumItemTuple &> (*variant);
for (auto &field : tuple.get_tuple_fields ())
types.emplace_back (field.get_field_type ().clone_type ());
break;
}
case EnumItem::Kind::Struct: {
auto &tuple = static_cast<EnumItemStruct &> (*variant);
for (auto &field : tuple.get_struct_fields ())
types.emplace_back (field.get_field_type ().clone_type ());
break;
}
}
}
expanded = eq_impls (assert_receiver_is_total_eq_fn (std::move (types)),
item.get_identifier ().as_string (),
item.get_generic_params ());
}
void
DeriveEq::visit_union (Union &item)
{
auto types = std::vector<std::unique_ptr<Type>> ();
for (auto &field : item.get_variants ())
types.emplace_back (field.get_field_type ().clone_type ());
expanded = eq_impls (assert_receiver_is_total_eq_fn (std::move (types)),
item.get_identifier ().as_string (),
item.get_generic_params ());
}
} // namespace AST
} // namespace Rust
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