// Copyright (C) 2020-2023 Free Software Foundation, Inc. // This file is part of GCC. // GCC is free software; you can redistribute it and/or modify it under // the terms of the GNU General Public License as published by the Free // Software Foundation; either version 3, or (at your option) any later // version. // GCC is distributed in the hope that it will be useful, but WITHOUT ANY // WARRANTY; without even the implied warranty of MERCHANTABILITY or // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License // for more details. // You should have received a copy of the GNU General Public License // along with GCC; see the file COPYING3. If not see // . #ifndef RUST_COERCION #define RUST_COERCION #include "rust-autoderef.h" #include "rust-hir-type-check.h" namespace Rust { namespace Resolver { class TypeCoercionRules : protected AutoderefCycle { public: struct CoercionResult { std::vector adjustments; TyTy::BaseType *tyty; bool is_error () { return tyty == nullptr || tyty->get_kind () == TyTy::TypeKind::ERROR; } static CoercionResult get_error () { return CoercionResult{{}, nullptr}; } }; static CoercionResult Coerce (TyTy::BaseType *receiver, TyTy::BaseType *expected, Location locus); static CoercionResult TryCoerce (TyTy::BaseType *receiver, TyTy::BaseType *expected, Location locus); CoercionResult coerce_unsafe_ptr (TyTy::BaseType *receiver, TyTy::PointerType *expected, Mutability mutability); CoercionResult coerce_borrowed_pointer (TyTy::BaseType *receiver, TyTy::ReferenceType *expected, Mutability mutability); CoercionResult coerce_unsized (TyTy::BaseType *receiver, TyTy::BaseType *expected, bool &unsafe_error); static bool coerceable_mutability (Mutability from_mutbl, Mutability to_mutbl); void mismatched_mutability_error (Location expr_locus, Location lhs, Location rhs); void object_unsafe_error (Location expr_locus, Location lhs, Location rhs); protected: TypeCoercionRules (TyTy::BaseType *expected, Location locus, bool emit_errors); bool select (const TyTy::BaseType &autoderefed) override; bool do_coercion (TyTy::BaseType *receiver); private: // context info Analysis::Mappings *mappings; TypeCheckContext *context; // search TyTy::BaseType *expected; Location locus; // mutable fields CoercionResult try_result; bool emit_errors; }; } // namespace Resolver } // namespace Rust #endif // RUST_COERCION