LCOV - code coverage report
Current view: top level - gcc/rust/expand - rust-expand-visitor.h (source / functions) Coverage Total Hit
Test: gcc.info Lines: 100.0 % 23 23
Test Date: 2025-01-18 13:11:24 Functions: 100.0 % 6 6
Legend: Lines: hit not hit | Branches: + taken - not taken # not executed Branches: - 0 0

             Branch data     Line data    Source code
       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_EXPAND_VISITOR_H
      20                 :             : #define RUST_EXPAND_VISITOR_H
      21                 :             : 
      22                 :             : #include "rust-ast-visitor.h"
      23                 :             : #include "rust-macro-expand.h"
      24                 :             : #include "rust-proc-macro.h"
      25                 :             : 
      26                 :             : namespace Rust {
      27                 :             : 
      28                 :             : /**
      29                 :             :  * Whether or not an attribute is a derive attribute
      30                 :             :  */
      31                 :             : bool
      32                 :             : is_derive (AST::Attribute &attr);
      33                 :             : 
      34                 :             : /**
      35                 :             :  * Whether or not an attribute is builtin
      36                 :             :  */
      37                 :             : bool
      38                 :             : is_builtin (AST::Attribute &attr);
      39                 :             : 
      40                 :             : class ExpandVisitor : public AST::DefaultASTVisitor
      41                 :             : {
      42                 :             : public:
      43                 :        5280 :   ExpandVisitor (MacroExpander &expander) : expander (expander) {}
      44                 :             : 
      45                 :             :   /* Expand all of the macro invocations currently contained in a crate */
      46                 :             :   void go (AST::Crate &crate);
      47                 :             : 
      48                 :             :   using AST::DefaultASTVisitor::visit;
      49                 :             : 
      50                 :             :   /*
      51                 :             :      Maybe expand a macro invocation in lieu of an expression
      52                 :             :      expr : Core guidelines R33, this function reseat the pointer.
      53                 :             :   */
      54                 :             :   void maybe_expand_expr (std::unique_ptr<AST::Expr> &expr);
      55                 :             : 
      56                 :             :   /*
      57                 :             :      Maybe expand a macro invocation in lieu of a type
      58                 :             :      type : Core guidelines R33, this function reseat the pointer.
      59                 :             :    */
      60                 :             :   void maybe_expand_type (std::unique_ptr<AST::Type> &type);
      61                 :             : 
      62                 :             :   /**
      63                 :             :    * Expand all macro invocations in lieu of types within a vector of struct
      64                 :             :    * fields
      65                 :             :    */
      66                 :             :   void expand_struct_fields (std::vector<AST::StructField> &fields);
      67                 :             : 
      68                 :             :   /**
      69                 :             :    * Expand all macro invocations in lieu of types within a vector of tuple
      70                 :             :    * fields
      71                 :             :    */
      72                 :             :   void expand_tuple_fields (std::vector<AST::TupleField> &fields);
      73                 :             : 
      74                 :             :   /**
      75                 :             :    * Expand all macro invocations in lieu of types within a list of function
      76                 :             :    * parameters
      77                 :             :    */
      78                 :             :   void
      79                 :             :   expand_function_params (std::vector<std::unique_ptr<AST::Param>> &params);
      80                 :             : 
      81                 :             :   /**
      82                 :             :    * Expand all macro invocations in lieu of types within a list of generic
      83                 :             :    * arguments
      84                 :             :    */
      85                 :             :   void expand_generic_args (AST::GenericArgs &args);
      86                 :             : 
      87                 :             :   /**
      88                 :             :    * Expand a macro invocation in lieu of a qualified path type
      89                 :             :    */
      90                 :             :   void expand_qualified_path_type (AST::QualifiedPathType &path_type);
      91                 :             : 
      92                 :             :   // FIXME: Add documentation
      93                 :             :   void expand_closure_params (std::vector<AST::ClosureParam> &params);
      94                 :             :   void expand_where_clause (AST::WhereClause &where_clause);
      95                 :             : 
      96                 :             :   /**
      97                 :             :    * Expand a set of values, erasing them if they are marked for strip, and
      98                 :             :    * replacing them with expanded macro nodes if necessary.
      99                 :             :    * This function is slightly different from `expand_pointer_allow_strip` as
     100                 :             :    * it can only be called in certain expansion contexts - where macro
     101                 :             :    * invocations are allowed.
     102                 :             :    *
     103                 :             :    * @param ctx Context to use for macro expansion
     104                 :             :    * @param values Iterable reference over values to replace or erase
     105                 :             :    * @param extractor Function to call when replacing values with the content
     106                 :             :    *            of an expanded AST node
     107                 :             :    */
     108                 :             :   template <typename T, typename U>
     109                 :        7377 :   void expand_macro_children (MacroExpander::ContextType ctx, T &values,
     110                 :             :                               std::function<U (AST::SingleASTNode)> extractor)
     111                 :             :   {
     112                 :        7377 :     expander.push_context (ctx);
     113                 :             : 
     114                 :        7377 :     expand_macro_children (values, extractor);
     115                 :             : 
     116                 :        7377 :     expander.pop_context ();
     117                 :        7377 :   }
     118                 :             : 
     119                 :             :   /**
     120                 :             :    * Same as `expand_macro_children`, but does not push a context. This is
     121                 :             :    * useful if you're already pushing the context manually anyway for proc macro
     122                 :             :    * expansion, like in `expand_inner_{items, stmts}`
     123                 :             :    */
     124                 :             :   template <typename T, typename U>
     125                 :       29605 :   void expand_macro_children (T &values,
     126                 :             :                               std::function<U (AST::SingleASTNode)> extractor)
     127                 :             :   {
     128                 :       77428 :     for (auto it = values.begin (); it != values.end ();)
     129                 :             :       {
     130                 :       47823 :         auto &value = *it;
     131                 :             : 
     132                 :             :         // Perform expansion
     133                 :       47823 :         value->accept_vis (*this);
     134                 :             : 
     135                 :       47823 :         auto final_fragment = expander.take_expanded_fragment ();
     136                 :             : 
     137                 :             :         // FIXME: Is that correct? It seems *extremely* dodgy
     138                 :       47823 :         if (final_fragment.should_expand ())
     139                 :             :           {
     140                 :         531 :             it = values.erase (it);
     141                 :        2583 :             for (auto &node : final_fragment.get_nodes ())
     142                 :             :               {
     143                 :        2052 :                 auto new_node = extractor (node);
     144                 :        2052 :                 if (new_node != nullptr)
     145                 :             :                   {
     146                 :        2039 :                     it = values.insert (it, std::move (new_node));
     147                 :        2039 :                     it++;
     148                 :             :                   }
     149                 :             :               }
     150                 :             :           }
     151                 :             :         else
     152                 :             :           {
     153                 :       47292 :             ++it;
     154                 :             :           }
     155                 :             :       }
     156                 :       29605 :   }
     157                 :             : 
     158                 :             :   /**
     159                 :             :    * Perform in-place expansion of procedural macros and macro invocations for
     160                 :             :    * an item container or statement container, such as `AST::Crate`,
     161                 :             :    * `AST::Module` or `AST::BlockExpr`. This function will insert the expanded
     162                 :             :    * nodes in place, and replace macro invocations with their expanded nodes.
     163                 :             :    *
     164                 :             :    * @param values Vector of values to mutate in-place and append into
     165                 :             :    */
     166                 :             :   void expand_inner_items (std::vector<std::unique_ptr<AST::Item>> &values);
     167                 :             :   void expand_inner_stmts (AST::BlockExpr &expr);
     168                 :             : 
     169                 :             :   // TODO: See if possible to make more specialization for Impl items, Block
     170                 :             :   // stmts etc? This could allow us to remove expand_macro_children or at least
     171                 :             :   // its extractor parameter
     172                 :             :   /**
     173                 :             :    * These functions allow to easily visit `std::unique_ptr`s as well as
     174                 :             :    * _replace_ them when necessary, e.g when expanding macro invocations in a
     175                 :             :    * list of expressions or types. The most generic version of the function will
     176                 :             :    * simply call the visitor again on the pointer, but there are two
     177                 :             :    * specializations for `std::unique_ptr<Expr>` and `std::unique_ptr<Type>` to
     178                 :             :    * enable replacing as well.
     179                 :             :    */
     180                 :       29592 :   template <typename T> void visit (std::unique_ptr<T> &value)
     181                 :             :   {
     182                 :       29592 :     value->accept_vis (*this);
     183                 :       11748 :   }
     184                 :             : 
     185                 :             :   template <typename T> void visit (std::unique_ptr<AST::Expr> &expr)
     186                 :             :   {
     187                 :             :     maybe_expand_expr (expr);
     188                 :             :   }
     189                 :             : 
     190                 :             :   template <typename T> void visit (std::unique_ptr<AST::Type> &type)
     191                 :             :   {
     192                 :             :     maybe_expand_type (type);
     193                 :             :   }
     194                 :             : 
     195                 :             :   void visit (AST::Crate &crate) override;
     196                 :             :   void visit (AST::DelimTokenTree &) override;
     197                 :             :   void visit (AST::AttrInputMetaItemContainer &) override;
     198                 :             :   void visit (AST::IdentifierExpr &ident_expr) override;
     199                 :             :   void visit (AST::LifetimeParam &) override;
     200                 :             :   void visit (AST::ConstGenericParam &) override;
     201                 :             : 
     202                 :             :   void visit (AST::MacroInvocation &macro_invoc) override;
     203                 :             : 
     204                 :             :   void visit (AST::PathInExpression &path) override;
     205                 :             :   void visit (AST::TypePathSegmentGeneric &segment) override;
     206                 :             :   void visit (AST::TypePathSegmentFunction &segment) override;
     207                 :             :   void visit (AST::QualifiedPathInExpression &path) override;
     208                 :             :   void visit (AST::QualifiedPathInType &path) override;
     209                 :             : 
     210                 :             :   void visit (AST::LiteralExpr &expr) override;
     211                 :             :   void visit (AST::AttrInputLiteral &) override;
     212                 :             :   void visit (AST::AttrInputMacro &) override;
     213                 :             :   void visit (AST::MetaItemLitExpr &) override;
     214                 :             :   void visit (AST::MetaItemPathLit &) override;
     215                 :             :   void visit (AST::ErrorPropagationExpr &expr) override;
     216                 :             :   void visit (AST::ArithmeticOrLogicalExpr &expr) override;
     217                 :             :   void visit (AST::ComparisonExpr &expr) override;
     218                 :             :   void visit (AST::LazyBooleanExpr &expr) override;
     219                 :             :   void visit (AST::AssignmentExpr &expr) override;
     220                 :             :   void visit (AST::CompoundAssignmentExpr &expr) override;
     221                 :             :   void visit (AST::GroupedExpr &expr) override;
     222                 :             :   void visit (AST::StructExprStruct &expr) override;
     223                 :             : 
     224                 :             :   void visit (AST::CallExpr &expr) override;
     225                 :             :   void visit (AST::MethodCallExpr &expr) override;
     226                 :             :   void visit (AST::ClosureExprInner &expr) override;
     227                 :             : 
     228                 :             :   void visit (AST::BlockExpr &expr) override;
     229                 :             : 
     230                 :             :   void visit (AST::ClosureExprInnerTyped &expr) override;
     231                 :             :   void visit (AST::ContinueExpr &expr) override;
     232                 :             :   void visit (AST::IfExpr &expr) override;
     233                 :             :   void visit (AST::IfExprConseqElse &expr) override;
     234                 :             :   void visit (AST::IfLetExpr &expr) override;
     235                 :             :   void visit (AST::IfLetExprConseqElse &expr) override;
     236                 :             :   void visit (AST::MatchExpr &expr) override;
     237                 :             :   void visit (AST::TypeParam &param) override;
     238                 :             :   void visit (AST::LifetimeWhereClauseItem &) override;
     239                 :             :   void visit (AST::TypeBoundWhereClauseItem &item) override;
     240                 :             :   void visit (AST::ExternCrate &crate) override;
     241                 :             :   void visit (AST::UseTreeGlob &) override;
     242                 :             :   void visit (AST::UseTreeList &) override;
     243                 :             :   void visit (AST::UseTreeRebind &) override;
     244                 :             :   void visit (AST::UseDeclaration &use_decl) override;
     245                 :             :   void visit (AST::Function &function) override;
     246                 :             :   void visit (AST::StructStruct &struct_item) override;
     247                 :             :   void visit (AST::TupleStruct &tuple_struct) override;
     248                 :             :   void visit (AST::EnumItem &item) override;
     249                 :             :   void visit (AST::EnumItemTuple &item) override;
     250                 :             :   void visit (AST::EnumItemStruct &item) override;
     251                 :             :   void visit (AST::EnumItemDiscriminant &item) override;
     252                 :             :   void visit (AST::Union &union_item) override;
     253                 :             :   void visit (AST::ConstantItem &const_item) override;
     254                 :             :   void visit (AST::StaticItem &static_item) override;
     255                 :             :   void visit (AST::TraitItemConst &item) override;
     256                 :             :   void visit (AST::Trait &trait) override;
     257                 :             :   void visit (AST::InherentImpl &impl) override;
     258                 :             :   void visit (AST::TraitImpl &impl) override;
     259                 :             :   void visit (AST::ExternalTypeItem &item) override;
     260                 :             :   void visit (AST::ExternalStaticItem &item) override;
     261                 :             :   void visit (AST::ExternBlock &block) override;
     262                 :             : 
     263                 :             :   // I don't think it would be possible to strip macros without expansion
     264                 :             :   void visit (AST::MacroMatchRepetition &) override;
     265                 :             :   void visit (AST::MacroMatcher &) override;
     266                 :             :   void visit (AST::MacroRulesDefinition &rules_def) override;
     267                 :             :   void visit (AST::MetaItemPath &) override;
     268                 :             :   void visit (AST::MetaItemSeq &) override;
     269                 :             :   void visit (AST::MetaListPaths &) override;
     270                 :             :   void visit (AST::MetaListNameValueStr &) override;
     271                 :             :   void visit (AST::StructPatternFieldIdent &field) override;
     272                 :             :   void visit (AST::GroupedPattern &pattern) override;
     273                 :             : 
     274                 :             :   void visit (AST::LetStmt &stmt) override;
     275                 :             :   void visit (AST::ExprStmt &stmt) override;
     276                 :             : 
     277                 :             :   void visit (AST::BareFunctionType &type) override;
     278                 :             :   void visit (AST::FunctionParam &type) override;
     279                 :             :   void visit (AST::SelfParam &type) override;
     280                 :             : 
     281                 :             :   template <typename T>
     282                 :             :   void expand_inner_attribute (T &item, AST::SimplePath &Path);
     283                 :             : 
     284                 :             :   template <typename T>
     285                 :             :   void visit_inner_using_attrs (T &item, std::vector<AST::Attribute> &attrs);
     286                 :             : 
     287                 :             :   template <typename T> void visit_inner_attrs (T &item);
     288                 :             : 
     289                 :             : private:
     290                 :             :   MacroExpander &expander;
     291                 :             : };
     292                 :             : 
     293                 :             : } // namespace Rust
     294                 :             : 
     295                 :             : #endif // RUST_EXPAND_VISITOR_H
        

Generated by: LCOV version 2.1-beta

LCOV profile is generated on x86_64 machine using following configure options: configure --disable-bootstrap --enable-coverage=opt --enable-languages=c,c++,fortran,go,jit,lto,rust,m2 --enable-host-shared. GCC test suite is run with the built compiler.