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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-system.h"
#include "optional.h"
#include "rust-lang-item.h"
#include "rust-mapping-common.h"
#include <ast/rust-ast-full-decls.h>
namespace Rust {
/*
* Used to convert different path segment object references
* into SimplePathSegment/PathIdentSegment references
*
* unwrap_type_segment:
* expands to a call to unwrap_type_segment_inner::unwrap,
* used for type inference
*/
#define unwrap_type_segment(x) \
(unwrap_type_segment_inner<typename std::remove_const< \
typename std::remove_reference<decltype (x)>::type>::type>::unwrap (x))
template <class T> class unwrap_type_segment_inner;
/* base case */
template <> class unwrap_type_segment_inner<AST::SimplePathSegment>
{
public:
/* The return type of unwrap */
using ret = AST::SimplePathSegment;
/* non-const qualified unwrap */
static AST::SimplePathSegment &unwrap (AST::SimplePathSegment &x)
{
return x;
}
/* const qualified unwrap */
static const AST::SimplePathSegment &unwrap (const AST::SimplePathSegment &x)
{
return x;
}
};
/* case which dereferences unique_ptr */
template <class T> class unwrap_type_segment_inner<std::unique_ptr<T>>
{
public:
using ret = typename unwrap_type_segment_inner<T>::ret;
static ret &unwrap (std::unique_ptr<T> &x)
{
return unwrap_type_segment (*x);
}
static const ret &unwrap (const std::unique_ptr<T> &x)
{
return unwrap_type_segment (*x);
}
};
/* case which handles objects with a get_ident_segment member function */
template <class T> class unwrap_type_segment_inner
{
public:
using ret = AST::PathIdentSegment;
static ret &unwrap (T &x) { return x.get_ident_segment (); }
static const ret &unwrap (const T &x) { return x.get_ident_segment (); }
};
/*
* Used to get the node id of a path segment object
*/
NodeId unwrap_segment_node_id (const AST::TypePathSegment &seg);
NodeId unwrap_segment_node_id (const AST::SimplePathSegment &seg);
NodeId unwrap_segment_node_id (const AST::PathExprSegment &seg);
template <class T>
NodeId
unwrap_segment_node_id (const std::unique_ptr<T> &ptr)
{
return unwrap_segment_node_id (*ptr);
}
/**
* Used to check if a path segment is associated with a lang item
*/
tl::optional<LangItem::Kind>
unwrap_segment_get_lang_item (const AST::TypePathSegment &seg);
tl::optional<LangItem::Kind>
unwrap_segment_get_lang_item (const AST::SimplePathSegment &seg);
tl::optional<LangItem::Kind>
unwrap_segment_get_lang_item (const AST::PathExprSegment &seg);
template <class T>
tl::optional<LangItem::Kind>
unwrap_segment_get_lang_item (const std::unique_ptr<T> &ptr)
{
return unwrap_segment_get_lang_item (*ptr);
}
/**
* Used to output a path in error messages
*/
inline static std::string
unwrap_segment_error_string (const AST::TypePath &path)
{
return path.make_debug_string ();
}
inline static std::string
unwrap_segment_error_string (const AST::PathInExpression &path)
{
return path.as_simple_path ().as_string ();
}
} // namespace Rust
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