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// Copyright (C) 2020-2023 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-clone.h"
#include "rust-item.h"
namespace Rust {
namespace AST {
std::unique_ptr<Expr>
DeriveClone::clone_call (std::unique_ptr<Expr> &&to_clone)
{
// $crate::core::clone::Clone::clone for the fully qualified path - we don't
// link with `core` yet so that might be an issue. Use `Clone::clone` for now?
// TODO: Factor this function inside the DeriveAccumulator
auto path = std::unique_ptr<Expr> (
new PathInExpression (builder.path_in_expression ({"Clone", "clone"})));
auto args = std::vector<std::unique_ptr<Expr>> ();
args.emplace_back (std::move (to_clone));
return builder.call (std::move (path), std::move (args));
}
/**
* Create the actual "clone" function of the implementation, so
*
* fn clone(&self) -> Self { <clone_expr> }
*
*/
std::unique_ptr<TraitImplItem>
DeriveClone::clone_fn (std::unique_ptr<Expr> &&clone_expr)
{
auto block = std::unique_ptr<BlockExpr> (
new BlockExpr ({}, std::move (clone_expr), {}, {}, AST::LoopLabel::error (),
loc, loc));
auto big_self_type = builder.single_type_path ("Self");
std::unique_ptr<SelfParam> self (new SelfParam (Lifetime::error (),
/* is_mut */ false, loc));
std::vector<std::unique_ptr<Param>> params;
params.push_back (std::move (self));
return std::unique_ptr<TraitImplItem> (
new Function ({"clone"}, builder.fn_qualifiers (), /* generics */ {},
/* function params */ std::move (params),
std::move (big_self_type), WhereClause::create_empty (),
std::move (block), Visibility::create_private (), {}, loc));
}
/**
* Create the Clone trait implementation for a type
*
* impl Clone for <type> {
* <clone_fn>
* }
*
*/
std::unique_ptr<Item>
DeriveClone::clone_impl (std::unique_ptr<TraitImplItem> &&clone_fn,
std::string name)
{
// should that be `$crate::core::clone::Clone` instead?
auto segments = std::vector<std::unique_ptr<TypePathSegment>> ();
segments.emplace_back (builder.type_path_segment ("Clone"));
auto clone = TypePath (std::move (segments), loc);
auto trait_items = std::vector<std::unique_ptr<TraitImplItem>> ();
trait_items.emplace_back (std::move (clone_fn));
return std::unique_ptr<Item> (
new TraitImpl (clone, /* unsafe */ false,
/* exclam */ false, std::move (trait_items),
/* generics */ {}, builder.single_type_path (name),
WhereClause::create_empty (), Visibility::create_private (),
{}, {}, loc));
}
// TODO: Create new `make_qualified_call` helper function
DeriveClone::DeriveClone (location_t loc)
: DeriveVisitor (loc), expanded (nullptr)
{}
std::unique_ptr<AST::Item>
DeriveClone::go (Item &item)
{
item.accept_vis (*this);
rust_assert (expanded);
return std::move (expanded);
}
void
DeriveClone::visit_tuple (TupleStruct &item)
{
auto cloned_fields = std::vector<std::unique_ptr<Expr>> ();
for (size_t idx = 0; idx < item.get_fields ().size (); idx++)
cloned_fields.emplace_back (
clone_call (builder.ref (builder.tuple_idx ("self", idx))));
auto path = std::unique_ptr<Expr> (new PathInExpression (
builder.path_in_expression ({item.get_identifier ().as_string ()})));
auto constructor = builder.call (std::move (path), std::move (cloned_fields));
expanded = clone_impl (clone_fn (std::move (constructor)),
item.get_identifier ().as_string ());
}
void
DeriveClone::visit_struct (StructStruct &item)
{
if (item.is_unit_struct ())
{
auto unit_ctor
= builder.struct_expr_struct (item.get_struct_name ().as_string ());
expanded = clone_impl (clone_fn (std::move (unit_ctor)),
item.get_struct_name ().as_string ());
return;
}
auto cloned_fields = std::vector<std::unique_ptr<StructExprField>> ();
for (auto &field : item.get_fields ())
{
auto name = field.get_field_name ().as_string ();
auto expr = clone_call (
builder.ref (builder.field_access (builder.identifier ("self"), name)));
cloned_fields.emplace_back (
builder.struct_expr_field (std::move (name), std::move (expr)));
}
auto ctor = builder.struct_expr (item.get_struct_name ().as_string (),
std::move (cloned_fields));
expanded = clone_impl (clone_fn (std::move (ctor)),
item.get_struct_name ().as_string ());
}
void
DeriveClone::visit_enum (Enum &item)
{
rust_sorry_at (item.get_locus (), "cannot derive %qs for these items yet",
"Clone");
}
void
DeriveClone::visit_union (Union &item)
{
// FIXME: Should be $crate::core::clone::AssertParamIsCopy (or similar)
// <Self>
auto arg = GenericArg::create_type (builder.single_type_path ("Self"));
// AssertParamIsCopy::<Self>
auto type = std::unique_ptr<TypePathSegment> (
new TypePathSegmentGeneric (PathIdentSegment ("AssertParamIsCopy", loc),
false, GenericArgs ({}, {arg}, {}, loc), loc));
auto type_paths = std::vector<std::unique_ptr<TypePathSegment>> ();
type_paths.emplace_back (std::move (type));
auto full_path
= std::unique_ptr<Type> (new TypePath ({std::move (type_paths)}, loc));
auto stmts = std::vector<std::unique_ptr<Stmt>> ();
stmts.emplace_back (
builder.let (builder.wildcard (), std::move (full_path), nullptr));
auto tail_expr = builder.deref (builder.identifier ("self"));
auto block = builder.block (std::move (stmts), std::move (tail_expr));
expanded = clone_impl (clone_fn (std::move (block)),
item.get_identifier ().as_string ());
}
} // namespace AST
} // namespace Rust
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