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// Copyright (C) 2020-2024 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
// <http://www.gnu.org/licenses/>.
#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<Adjustment> 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_t locus,
bool allow_autoderef,
bool is_cast_site = false);
static CoercionResult TryCoerce (TyTy::BaseType *receiver,
TyTy::BaseType *expected, location_t locus,
bool allow_autoderef,
bool is_cast_site = false);
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_t expr_locus, location_t lhs,
location_t rhs);
void object_unsafe_error (location_t expr_locus, location_t lhs,
location_t rhs);
protected:
TypeCoercionRules (TyTy::BaseType *expected, location_t locus,
bool emit_errors, bool allow_autoderef, bool try_flag,
bool is_cast_site);
bool select (TyTy::BaseType &autoderefed) override;
bool do_coercion (TyTy::BaseType *receiver);
private:
// context info
Analysis::Mappings &mappings;
TypeCheckContext *context;
// search
TyTy::BaseType *expected;
location_t locus;
// mutable fields
CoercionResult try_result;
bool emit_errors;
bool try_flag;
bool is_cast_site;
};
} // namespace Resolver
} // namespace Rust
#endif // RUST_COERCION
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