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       1                 :             : // Copyright (C) 2020-2025 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_FEATURE_GATE_H
      20                 :             : #define RUST_FEATURE_GATE_H
      21                 :             : 
      22                 :             : #include "rust-ast-visitor.h"
      23                 :             : #include "rust-feature.h"
      24                 :             : 
      25                 :             : namespace Rust {
      26                 :             : 
      27                 :        4937 : class FeatureGate : public AST::DefaultASTVisitor
      28                 :             : {
      29                 :             : public:
      30                 :        4937 :   FeatureGate () {}
      31                 :             : 
      32                 :             :   using AST::DefaultASTVisitor::visit;
      33                 :             : 
      34                 :             :   void check (AST::Crate &crate);
      35                 :             :   void visit (AST::Crate &crate) override;
      36                 :             : 
      37                 :             :   void visit (AST::LifetimeParam &lifetime_param) override;
      38                 :             :   void visit (AST::ConstGenericParam &const_param) override;
      39                 :             :   void visit (AST::BorrowExpr &expr) override;
      40                 :             :   void visit (AST::BoxExpr &expr) override;
      41                 :             :   void visit (AST::TypeParam &param) override;
      42                 :             :   void visit (AST::UseTreeGlob &use_tree) override;
      43                 :             :   void visit (AST::Function &function) override;
      44                 :             :   void visit (AST::TraitImpl &impl) override;
      45                 :             :   void visit (AST::Trait &trait) override;
      46                 :             :   void visit (AST::ExternalTypeItem &item) override;
      47                 :             :   void visit (AST::ExternBlock &block) override;
      48                 :             :   void visit (AST::MacroRulesDefinition &rules_def) override;
      49                 :             :   void visit (AST::RangePattern &pattern) override;
      50                 :             : 
      51                 :             : private:
      52                 :             :   void gate (Feature::Name name, location_t loc, const std::string &error_msg);
      53                 :             :   void check_rustc_attri (const std::vector<AST::Attribute> &attributes);
      54                 :             :   void
      55                 :             :   check_may_dangle_attribute (const std::vector<AST::Attribute> &attributes);
      56                 :             :   std::set<Feature::Name> valid_features;
      57                 :             : };
      58                 :             : } // namespace Rust
      59                 :             : #endif