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       1              : // Copyright (C) 2025-2026 Free Software Foundation, Inc.
       2              : 
       3              : // This file is part of GCC.
       4              : 
       5              : // GCC is free software; you can redistribute it and/or modify it under
       6              : // the terms of the GNU General Public License as published by the Free
       7              : // Software Foundation; either version 3, or (at your option) any later
       8              : // version.
       9              : 
      10              : // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      11              : // WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12              : // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      13              : // for more details.
      14              : 
      15              : // You should have received a copy of the GNU General Public License
      16              : // along with GCC; see the file COPYING3.  If not see
      17              : // <http://www.gnu.org/licenses/>.
      18              : 
      19              : #ifndef RUST_UNWRAP_SEGMENT_H
      20              : #define RUST_UNWRAP_SEGMENT_H
      21              : 
      22              : #include "rust-system.h"
      23              : #include "optional.h"
      24              : #include "rust-lang-item.h"
      25              : #include "rust-mapping-common.h"
      26              : #include <ast/rust-ast-full-decls.h>
      27              : 
      28              : namespace Rust {
      29              : 
      30              : /*
      31              :  * Used to convert different path segment object references
      32              :  * into SimplePathSegment/PathIdentSegment references
      33              :  *
      34              :  * unwrap_type_segment:
      35              :  *   expands to a call to unwrap_type_segment_inner::unwrap,
      36              :  *   used for type inference
      37              :  */
      38              : #define unwrap_type_segment(x)                                                 \
      39              :   (unwrap_type_segment_inner<typename std::remove_const<                       \
      40              :      typename std::remove_reference<decltype (x)>::type>::type>::unwrap (x))
      41              : 
      42              : template <class T> class unwrap_type_segment_inner;
      43              : 
      44              : /* base case */
      45              : template <> class unwrap_type_segment_inner<AST::SimplePathSegment>
      46              : {
      47              : public:
      48              :   /* The return type of unwrap */
      49              :   using ret = AST::SimplePathSegment;
      50              : 
      51              :   /* non-const qualified unwrap */
      52              :   static AST::SimplePathSegment &unwrap (AST::SimplePathSegment &x)
      53              :   {
      54              :     return x;
      55              :   }
      56              : 
      57              :   /* const qualified unwrap */
      58        26288 :   static const AST::SimplePathSegment &unwrap (const AST::SimplePathSegment &x)
      59              :   {
      60        26288 :     return x;
      61              :   }
      62              : };
      63              : 
      64              : /* case which dereferences unique_ptr */
      65              : template <class T> class unwrap_type_segment_inner<std::unique_ptr<T>>
      66              : {
      67              : public:
      68              :   using ret = typename unwrap_type_segment_inner<T>::ret;
      69              : 
      70        52933 :   static ret &unwrap (std::unique_ptr<T> &x)
      71              :   {
      72        52933 :     return unwrap_type_segment (*x);
      73              :   }
      74        56215 :   static const ret &unwrap (const std::unique_ptr<T> &x)
      75              :   {
      76        56215 :     return unwrap_type_segment (*x);
      77              :   }
      78              : };
      79              : 
      80              : /* case which handles objects with a get_ident_segment member function */
      81              : template <class T> class unwrap_type_segment_inner
      82              : {
      83              : public:
      84              :   using ret = AST::PathIdentSegment;
      85              : 
      86       109220 :   static ret &unwrap (T &x) { return x.get_ident_segment (); }
      87        34848 :   static const ret &unwrap (const T &x) { return x.get_ident_segment (); }
      88              : };
      89              : 
      90              : /*
      91              :  * Used to get the node id of a path segment object
      92              :  */
      93              : NodeId unwrap_segment_node_id (const AST::TypePathSegment &seg);
      94              : 
      95              : NodeId unwrap_segment_node_id (const AST::SimplePathSegment &seg);
      96              : 
      97              : NodeId unwrap_segment_node_id (const AST::PathExprSegment &seg);
      98              : 
      99              : template <class T>
     100              : NodeId
     101        57646 : unwrap_segment_node_id (const std::unique_ptr<T> &ptr)
     102              : {
     103        57646 :   return unwrap_segment_node_id (*ptr);
     104              : }
     105              : 
     106              : /**
     107              :  * Used to check if a path segment is associated with a lang item
     108              :  */
     109              : tl::optional<LangItem::Kind>
     110              : unwrap_segment_get_lang_item (const AST::TypePathSegment &seg);
     111              : 
     112              : tl::optional<LangItem::Kind>
     113              : unwrap_segment_get_lang_item (const AST::SimplePathSegment &seg);
     114              : 
     115              : tl::optional<LangItem::Kind>
     116              : unwrap_segment_get_lang_item (const AST::PathExprSegment &seg);
     117              : 
     118              : template <class T>
     119              : tl::optional<LangItem::Kind>
     120       109932 : unwrap_segment_get_lang_item (const std::unique_ptr<T> &ptr)
     121              : {
     122       109932 :   return unwrap_segment_get_lang_item (*ptr);
     123              : }
     124              : 
     125              : /**
     126              :  * Used to output a path in error messages
     127              :  */
     128              : 
     129              : inline static std::string
     130           26 : unwrap_segment_error_string (const AST::TypePath &path)
     131              : {
     132           26 :   return path.make_debug_string ();
     133              : }
     134              : 
     135              : inline static std::string
     136            0 : unwrap_segment_error_string (const AST::PathInExpression &path)
     137              : {
     138            0 :   return path.as_simple_path ().as_string ();
     139              : }
     140              : 
     141              : } // namespace Rust
     142              : 
     143              : #endif // RUST_UNWRAP_SEGMENT_H