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       1                 :             : // Copyright (C) 2020-2024 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_PRIVACY_CTX_H
      20                 :             : #define RUST_PRIVACY_CTX_H
      21                 :             : 
      22                 :             : #include "rust-hir-map.h"
      23                 :             : #include "rust-privacy-check.h"
      24                 :             : 
      25                 :             : namespace Rust {
      26                 :             : namespace Privacy {
      27                 :             : 
      28                 :             : /**
      29                 :             :  * Reachability levels of HIR nodes. These levels are computed through the
      30                 :             :  * `ReachabilityVisitor` visitor.
      31                 :             :  */
      32                 :             : enum ReachLevel
      33                 :             : {
      34                 :             :   Unreachable,
      35                 :             :   Reachable,
      36                 :             : };
      37                 :             : 
      38                 :        6698 : class PrivacyContext
      39                 :             : {
      40                 :             : public:
      41                 :             :   /**
      42                 :             :    * Insert a new resolved visibility for a given node. If the node is already
      43                 :             :    * present in the reachability map, then its visibility will only be updated
      44                 :             :    * if the given visibility is higher.
      45                 :             :    *
      46                 :             :    * @param mappings Mappings of the node to store the reach level for
      47                 :             :    * @param reach Level of reachability for the given node
      48                 :             :    *
      49                 :             :    * @return The new reachability level for this node. If this was the first
      50                 :             :    * time inserting this node, then return `reach`. Otherwise, return `reach` or
      51                 :             :    * the existing reach level if it was higher.
      52                 :             :    */
      53                 :             :   ReachLevel update_reachability (const Analysis::NodeMapping &mapping,
      54                 :             :                                   ReachLevel reach);
      55                 :             : 
      56                 :             :   /**
      57                 :             :    * Lookup the visibility of an already declared Node
      58                 :             :    *
      59                 :             :    * @param mapping Mappings of the node to fetch the reach level of
      60                 :             :    *
      61                 :             :    * @return `nullptr` if the reach level for the current node has not been
      62                 :             :    * added, a valid pointer otherwise
      63                 :             :    */
      64                 :             :   const ReachLevel *lookup_reachability (const Analysis::NodeMapping &mapping);
      65                 :             : 
      66                 :             : private:
      67                 :             :   std::unordered_map<DefId, ReachLevel> reachability_map;
      68                 :             : };
      69                 :             : } // namespace Privacy
      70                 :             : } // namespace Rust
      71                 :             : 
      72                 :             : #if CHECKING_P
      73                 :             : namespace selftest {
      74                 :             : void
      75                 :             : rust_privacy_ctx_test (void);
      76                 :             : }
      77                 :             : #endif // !CHECKING_P
      78                 :             : 
      79                 :             : #endif // !RUST_PRIVACY_CTX_H