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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_REACHABILITY_H
      20                 :             : #define RUST_REACHABILITY_H
      21                 :             : 
      22                 :             : #include "rust-privacy-ctx.h"
      23                 :             : #include "rust-hir-visitor.h"
      24                 :             : #include "rust-hir.h"
      25                 :             : #include "rust-hir-expr.h"
      26                 :             : #include "rust-hir-stmt.h"
      27                 :             : #include "rust-hir-item.h"
      28                 :             : #include "rust-hir-type-check.h"
      29                 :             : 
      30                 :             : namespace Rust {
      31                 :             : namespace Privacy {
      32                 :             : 
      33                 :             : // FIXME: The EmbargoVisitor from rustc is a fixed-point visitor which tries
      34                 :             : // to reach more and more nodes until nothing has changed anymore.
      35                 :             : // Do we need to reproduce this behavior? How long does it take to do this?
      36                 :             : 
      37                 :             : /**
      38                 :             :  * The ReachabilityVisitor tries to reach all items possible in the crate,
      39                 :             :  * according to their privacy level.
      40                 :             :  */
      41                 :             : class ReachabilityVisitor : public HIR::HIRVisItemVisitor
      42                 :             : {
      43                 :             : public:
      44                 :        3348 :   ReachabilityVisitor (PrivacyContext &ctx,
      45                 :             :                        const ::Rust::Resolver::TypeCheckContext &ty_ctx)
      46                 :        3348 :     : current_level (ReachLevel::Reachable), ctx (ctx), ty_ctx (ty_ctx)
      47                 :             :   {}
      48                 :             : 
      49                 :             :   // FIXME: Add `go` method which takes an `HIR::Crate &` as argument
      50                 :             : 
      51                 :             :   /**
      52                 :             :    * Visit all the predicates of all the generic types of a given item, marking
      53                 :             :    * them as reachable or not.
      54                 :             :    */
      55                 :             :   void visit_generic_predicates (
      56                 :             :     const std::vector<std::unique_ptr<HIR::GenericParam>> &generics,
      57                 :             :     ReachLevel item_reach);
      58                 :             : 
      59                 :             :   /**
      60                 :             :    * Get the initial reach level for an item based on its visibility.
      61                 :             :    */
      62                 :             :   ReachLevel get_reachability_level (const HIR::Visibility &item_visibility);
      63                 :             : 
      64                 :             :   virtual void visit (HIR::Module &mod);
      65                 :             :   virtual void visit (HIR::ExternCrate &crate);
      66                 :             :   virtual void visit (HIR::UseDeclaration &use_decl);
      67                 :             :   virtual void visit (HIR::Function &func);
      68                 :             :   virtual void visit (HIR::TypeAlias &type_alias);
      69                 :             :   virtual void visit (HIR::StructStruct &struct_item);
      70                 :             :   virtual void visit (HIR::TupleStruct &tuple_struct);
      71                 :             :   virtual void visit (HIR::Enum &enum_item);
      72                 :             :   virtual void visit (HIR::Union &union_item);
      73                 :             :   virtual void visit (HIR::ConstantItem &const_item);
      74                 :             :   virtual void visit (HIR::StaticItem &static_item);
      75                 :             :   virtual void visit (HIR::Trait &trait);
      76                 :             :   virtual void visit (HIR::ImplBlock &impl);
      77                 :             :   virtual void visit (HIR::ExternBlock &block);
      78                 :             : 
      79                 :             : private:
      80                 :             :   ReachLevel current_level;
      81                 :             :   PrivacyContext &ctx;
      82                 :             :   const ::Rust::Resolver::TypeCheckContext &ty_ctx;
      83                 :             : };
      84                 :             : } // namespace Privacy
      85                 :             : } // namespace Rust
      86                 :             : 
      87                 :             : #endif // !RUST_REACHABILITY_H