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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-debug.h"
#include "rust-ast.h"
#include "rust-hir-map.h"
#include "rust-system.h"
namespace Rust {
namespace AST {
DeriveDebug::DeriveDebug (location_t loc)
: DeriveVisitor (loc), expanded (nullptr)
{}
std::unique_ptr<Item>
DeriveDebug::go (Item &item)
{
item.accept_vis (*this);
rust_assert (expanded);
return std::move (expanded);
}
std::unique_ptr<AssociatedItem>
DeriveDebug::stub_debug_fn ()
{
auto unit_expr = builder.tuple ();
auto ok_expr
= ptrify (builder.path_in_expression (LangItem::Kind::RESULT_OK));
auto stub_return = builder.call (std::move (ok_expr), std::move (unit_expr));
// we can't use builder.block() here as it returns a unique_ptr<Expr> and
// Function's constructor expects a unique_ptr<BlockExpr>
auto block = std::unique_ptr<BlockExpr> (
new BlockExpr ({}, std::move (stub_return), {}, {},
AST::LoopLabel::error (), loc, loc));
auto self = builder.self_ref_param ();
auto return_type
= ptrify (builder.type_path ({"core", "fmt", "Result"}, true));
auto mut_fmt_type_inner
= ptrify (builder.type_path ({"core", "fmt", "Formatter"}, true));
auto mut_fmt_type
= builder.reference_type (std::move (mut_fmt_type_inner), true);
auto fmt = builder.function_param (builder.identifier_pattern ("_fmt"),
std::move (mut_fmt_type));
auto params = vec (std::move (self), std::move (fmt));
auto function = builder.function ("fmt", std::move (params),
std::move (return_type), std::move (block));
return function;
}
std::unique_ptr<Item>
DeriveDebug::stub_derive_impl (
std::string name,
const std::vector<std::unique_ptr<GenericParam>> &type_generics)
{
auto trait_items = vec (stub_debug_fn ());
auto debug = builder.type_path ({"core", "fmt", "Debug"}, true);
auto generics
= setup_impl_generics (name, type_generics, builder.trait_bound (debug));
return builder.trait_impl (debug, std::move (generics.self_type),
std::move (trait_items),
std::move (generics.impl));
}
void
DeriveDebug::visit_struct (StructStruct &struct_item)
{
expanded = stub_derive_impl (struct_item.get_identifier ().as_string (),
struct_item.get_generic_params ());
}
void
DeriveDebug::visit_tuple (TupleStruct &tuple_item)
{
expanded = stub_derive_impl (tuple_item.get_identifier ().as_string (),
tuple_item.get_generic_params ());
}
void
DeriveDebug::visit_enum (Enum &enum_item)
{
expanded = stub_derive_impl (enum_item.get_identifier ().as_string (),
enum_item.get_generic_params ());
}
void
DeriveDebug::visit_union (Union &enum_item)
{
rust_error_at (loc, "derive(Debug) cannot be derived for unions");
}
} // namespace AST
} // namespace Rust
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