1  // Copyright (C) 2020-2023 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_UNIFY
      20  #define RUST_UNIFY
      21  
      22  #include "rust-tyty-util.h"
      23  #include "rust-hir-type-check.h"
      24  
      25  namespace Rust {
      26  namespace Resolver {
      27  
      28  class UnifyRules
      29  {
      30  public:
      31    static TyTy::BaseType *Resolve (TyTy::TyWithLocation lhs,
      32  				  TyTy::TyWithLocation rhs, Location locus,
      33  				  bool commit_flag, bool emit_error);
      34  
      35  protected:
      36    TyTy::BaseType *expect_inference_variable (TyTy::InferType *ltype,
      37  					     TyTy::BaseType *rtype);
      38    TyTy::BaseType *expect_adt (TyTy::ADTType *ltype, TyTy::BaseType *rtype);
      39    TyTy::BaseType *expect_str (TyTy::StrType *ltype, TyTy::BaseType *rtype);
      40    TyTy::BaseType *expect_reference (TyTy::ReferenceType *ltype,
      41  				    TyTy::BaseType *rtype);
      42    TyTy::BaseType *expect_pointer (TyTy::PointerType *ltype,
      43  				  TyTy::BaseType *rtype);
      44    TyTy::BaseType *expect_param (TyTy::ParamType *ltype, TyTy::BaseType *rtype);
      45    TyTy::BaseType *expect_array (TyTy::ArrayType *ltype, TyTy::BaseType *rtype);
      46    TyTy::BaseType *expect_slice (TyTy::SliceType *ltype, TyTy::BaseType *rtype);
      47    TyTy::BaseType *expect_fndef (TyTy::FnType *ltype, TyTy::BaseType *rtype);
      48    TyTy::BaseType *expect_fnptr (TyTy::FnPtr *ltype, TyTy::BaseType *rtype);
      49    TyTy::BaseType *expect_tuple (TyTy::TupleType *ltype, TyTy::BaseType *rtype);
      50    TyTy::BaseType *expect_bool (TyTy::BoolType *ltype, TyTy::BaseType *rtype);
      51    TyTy::BaseType *expect_char (TyTy::CharType *ltype, TyTy::BaseType *rtype);
      52    TyTy::BaseType *expect_int (TyTy::IntType *ltype, TyTy::BaseType *rtype);
      53    TyTy::BaseType *expect_uint (TyTy::UintType *ltype, TyTy::BaseType *rtype);
      54    TyTy::BaseType *expect_float (TyTy::FloatType *ltype, TyTy::BaseType *rtype);
      55    TyTy::BaseType *expect_isize (TyTy::ISizeType *ltype, TyTy::BaseType *rtype);
      56    TyTy::BaseType *expect_usize (TyTy::USizeType *ltype, TyTy::BaseType *rtype);
      57    TyTy::BaseType *expect_never (TyTy::NeverType *ltype, TyTy::BaseType *rtype);
      58    TyTy::BaseType *expect_placeholder (TyTy::PlaceholderType *ltype,
      59  				      TyTy::BaseType *rtype);
      60    TyTy::BaseType *expect_projection (TyTy::ProjectionType *ltype,
      61  				     TyTy::BaseType *rtype);
      62    TyTy::BaseType *expect_dyn (TyTy::DynamicObjectType *ltype,
      63  			      TyTy::BaseType *rtype);
      64    TyTy::BaseType *expect_closure (TyTy::ClosureType *ltype,
      65  				  TyTy::BaseType *rtype);
      66  
      67  private:
      68    UnifyRules (TyTy::TyWithLocation lhs, TyTy::TyWithLocation rhs,
      69  	      Location locus, bool commit_flag, bool emit_error);
      70  
      71    void emit_type_mismatch () const;
      72    void commit (TyTy::BaseType *resolved);
      73    TyTy::BaseType *go ();
      74  
      75    TyTy::BaseType *get_base ();
      76    TyTy::BaseType *get_other ();
      77  
      78    TyTy::TyWithLocation lhs;
      79    TyTy::TyWithLocation rhs;
      80    Location locus;
      81    bool commit_flag;
      82    bool emit_error;
      83  
      84    Analysis::Mappings &mappings;
      85    TypeCheckContext &context;
      86  };
      87  
      88  } // namespace Resolver
      89  } // namespace Rust
      90  
      91  #endif // RUST_UNIFY