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       1              : // Copyright (C) 2020-2026 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              : #ifndef RUST_CFG_STRIP_H
      19              : #define RUST_CFG_STRIP_H
      20              : 
      21              : #include "rust-ast-visitor.h"
      22              : #include "rust-ast.h"
      23              : #include "rust-item.h"
      24              : 
      25              : namespace Rust {
      26              : 
      27              : // forward declare
      28              : struct ExpansionCfg;
      29              : 
      30              : // Visitor used to maybe_strip attributes.
      31              : class CfgStrip : public AST::DefaultASTVisitor
      32              : {
      33              : private:
      34              :   bool fails_cfg (const AST::AttrVec &attrs) const;
      35              : 
      36              :   bool fails_cfg_with_expand (AST::AttrVec &attrs) const;
      37              : 
      38              : public:
      39              :   using DefaultASTVisitor::visit;
      40              : 
      41        10411 :   CfgStrip (const ExpansionCfg &expansion_cfg) : expansion_cfg (expansion_cfg)
      42              :   {}
      43              : 
      44              :   /* Run the AttrVisitor on an entire crate */
      45              :   void go (AST::Crate &crate);
      46              : 
      47              :   void maybe_strip_struct_fields (std::vector<AST::StructField> &fields);
      48              :   void maybe_strip_struct_expr_fields (
      49              :     std::vector<std::unique_ptr<AST::StructExprField>> &fields);
      50              :   void maybe_strip_tuple_fields (std::vector<AST::TupleField> &fields);
      51              :   void maybe_strip_function_params (
      52              :     std::vector<std::unique_ptr<AST::Param>> &params);
      53              :   void maybe_strip_generic_args (AST::GenericArgs &args);
      54              :   void maybe_strip_qualified_path_type (AST::QualifiedPathType &path_type);
      55              :   void maybe_strip_closure_params (std::vector<AST::ClosureParam> &params);
      56              :   void maybe_strip_self_param (AST::SelfParam &self_param);
      57              :   void maybe_strip_where_clause (AST::WhereClause &where_clause);
      58              : 
      59              :   /**
      60              :    * maybe_strip a set of values, erasing them if they are marked for strip.
      61              :    *
      62              :    * @param values Iterable reference over values to replace or erase
      63              :    */
      64       212589 :   template <typename T> void maybe_strip_pointer_allow_strip (T &values)
      65              :   {
      66       439227 :     for (auto it = values.begin (); it != values.end ();)
      67              :       {
      68       226638 :         auto &value = *it;
      69              : 
      70              :         // mark for stripping if required
      71       226638 :         value->accept_vis (*this);
      72       226638 :         if (value->is_marked_for_strip ())
      73           26 :           it = values.erase (it);
      74              :         else
      75       226612 :           ++it;
      76              :       }
      77       212589 :   }
      78              : 
      79              :   void visit (AST::Crate &crate) override;
      80              :   void visit (AST::IdentifierExpr &ident_expr) override;
      81              : 
      82              :   void visit (AST::MacroInvocation &macro_invoc) override;
      83              : 
      84              :   void visit (AST::PathInExpression &path) override;
      85              :   void visit (AST::TypePathSegmentGeneric &segment) override;
      86              :   void visit (AST::TypePathSegmentFunction &segment) override;
      87              :   void visit (AST::QualifiedPathInExpression &path) override;
      88              :   void visit (AST::QualifiedPathInType &path) override;
      89              : 
      90              :   void visit (AST::LiteralExpr &expr) override;
      91              :   void visit (AST::BorrowExpr &expr) override;
      92              :   void visit (AST::DereferenceExpr &expr) override;
      93              :   void visit (AST::ErrorPropagationExpr &expr) override;
      94              :   void visit (AST::NegationExpr &expr) override;
      95              :   void visit (AST::ArithmeticOrLogicalExpr &expr) override;
      96              :   void visit (AST::ComparisonExpr &expr) override;
      97              :   void visit (AST::LazyBooleanExpr &expr) override;
      98              :   void visit (AST::TypeCastExpr &expr) override;
      99              :   void visit (AST::AssignmentExpr &expr) override;
     100              :   void visit (AST::CompoundAssignmentExpr &expr) override;
     101              :   void visit (AST::GroupedExpr &expr) override;
     102              :   void visit (AST::ArrayElemsValues &elems) override;
     103              :   void visit (AST::ArrayElemsCopied &elems) override;
     104              :   void visit (AST::ArrayExpr &expr) override;
     105              :   void visit (AST::ArrayIndexExpr &expr) override;
     106              :   void visit (AST::TupleExpr &expr) override;
     107              :   void visit (AST::TupleIndexExpr &expr) override;
     108              :   void visit (AST::StructExprStruct &expr) override;
     109              :   void visit (AST::StructExprFieldIdentifierValue &field) override;
     110              : 
     111              :   void visit (AST::StructExprFieldIndexValue &field) override;
     112              :   void visit (AST::StructExprStructFields &expr) override;
     113              :   void visit (AST::StructExprStructBase &expr) override;
     114              :   void visit (AST::CallExpr &expr) override;
     115              :   void visit (AST::MethodCallExpr &expr) override;
     116              :   void visit (AST::FieldAccessExpr &expr) override;
     117              :   void visit (AST::ClosureExprInner &expr) override;
     118              : 
     119              :   void visit (AST::BlockExpr &expr) override;
     120              : 
     121              :   void visit (AST::ClosureExprInnerTyped &expr) override;
     122              :   void visit (AST::ContinueExpr &expr) override;
     123              :   void visit (AST::BreakExpr &expr) override;
     124              :   void visit (AST::RangeFromToExpr &expr) override;
     125              :   void visit (AST::RangeFromExpr &expr) override;
     126              :   void visit (AST::RangeToExpr &expr) override;
     127              :   void visit (AST::RangeFromToInclExpr &expr) override;
     128              :   void visit (AST::RangeToInclExpr &expr) override;
     129              :   void visit (AST::ReturnExpr &expr) override;
     130              :   void visit (AST::UnsafeBlockExpr &expr) override;
     131              :   void visit (AST::LoopExpr &expr) override;
     132              :   void visit (AST::WhileLoopExpr &expr) override;
     133              :   void visit (AST::WhileLetLoopExpr &expr) override;
     134              :   void visit (AST::ForLoopExpr &expr) override;
     135              :   void visit (AST::IfExpr &expr) override;
     136              :   void visit (AST::IfExprConseqElse &expr) override;
     137              :   void visit (AST::IfLetExpr &expr) override;
     138              :   void visit (AST::IfLetExprConseqElse &expr) override;
     139              :   void visit (AST::MatchExpr &expr) override;
     140              :   void visit (AST::AwaitExpr &expr) override;
     141              :   void visit (AST::AsyncBlockExpr &expr) override;
     142              :   void visit (AST::TypeParam &param) override;
     143              :   void visit (AST::TypeBoundWhereClauseItem &item) override;
     144              :   void visit (AST::Module &module) override;
     145              :   void visit (AST::ExternCrate &crate) override;
     146              :   void visit (AST::UseDeclaration &use_decl) override;
     147              :   void visit (AST::Function &function) override;
     148              :   void visit (AST::TypeAlias &type_alias) override;
     149              :   void visit (AST::StructStruct &struct_item) override;
     150              :   void visit (AST::TupleStruct &tuple_struct) override;
     151              :   void visit (AST::EnumItem &item) override;
     152              :   void visit (AST::EnumItemTuple &item) override;
     153              :   void visit (AST::EnumItemStruct &item) override;
     154              :   void visit (AST::EnumItemDiscriminant &item) override;
     155              :   void visit (AST::Enum &enum_item) override;
     156              :   void visit (AST::Union &union_item) override;
     157              :   void visit (AST::ConstantItem &const_item) override;
     158              :   void visit (AST::StaticItem &static_item) override;
     159              :   void visit (AST::TraitItemType &item) override;
     160              :   void visit (AST::Trait &trait) override;
     161              :   void visit (AST::InherentImpl &impl) override;
     162              :   void visit (AST::TraitImpl &impl) override;
     163              :   void visit (AST::ExternalTypeItem &item) override;
     164              :   void visit (AST::ExternalStaticItem &item) override;
     165              :   void visit (AST::ExternBlock &block) override;
     166              : 
     167              :   // I don't think it would be possible to strip macros without expansion
     168              :   void visit (AST::MacroRulesDefinition &rules_def) override;
     169              :   void visit (AST::IdentifierPattern &pattern) override;
     170              :   void visit (AST::RangePatternBoundPath &bound) override;
     171              :   void visit (AST::RangePatternBoundQualPath &bound) override;
     172              :   void visit (AST::ReferencePattern &pattern) override;
     173              :   void visit (AST::StructPatternFieldTuplePat &field) override;
     174              :   void visit (AST::StructPatternFieldIdentPat &field) override;
     175              :   void visit (AST::StructPatternFieldIdent &field) override;
     176              :   void visit (AST::StructPattern &pattern) override;
     177              :   void visit (AST::TupleStructItemsNoRest &tuple_items) override;
     178              :   void visit (AST::TupleStructItemsHasRest &tuple_items) override;
     179              :   void visit (AST::TupleStructPattern &pattern) override;
     180              :   void visit (AST::TuplePatternItemsNoRest &tuple_items) override;
     181              :   void visit (AST::TuplePatternItemsHasRest &tuple_items) override;
     182              :   void visit (AST::GroupedPattern &pattern) override;
     183              :   void visit (AST::SlicePatternItemsNoRest &items) override;
     184              :   void visit (AST::SlicePatternItemsHasRest &items) override;
     185              :   void visit (AST::SlicePattern &pattern) override;
     186              :   void visit (AST::AltPattern &pattern) override;
     187              : 
     188              :   void visit (AST::LetStmt &stmt) override;
     189              :   void visit (AST::ExprStmt &stmt) override;
     190              : 
     191              :   void visit (AST::TraitBound &bound) override;
     192              :   void visit (AST::ParenthesisedType &type) override;
     193              :   void visit (AST::TupleType &type) override;
     194              :   void visit (AST::RawPointerType &type) override;
     195              :   void visit (AST::ReferenceType &type) override;
     196              :   void visit (AST::ArrayType &type) override;
     197              :   void visit (AST::SliceType &type) override;
     198              :   void visit (AST::BareFunctionType &type) override;
     199              :   void visit (AST::SelfParam &type) override;
     200              : 
     201              :   template <typename T> void visit (T &item)
     202              :   {
     203              :     DefaultASTVisitor::visit (item);
     204              :   }
     205              : 
     206              : private:
     207              :   const ExpansionCfg &expansion_cfg;
     208              : };
     209              : } // namespace Rust
     210              : 
     211              : #endif // RUST_CFG_STRIP_Hs