18dffb485Schristos /* Base class of intrusively reference-counted objects. 2*5ba1f45fSchristos Copyright (C) 2017-2024 Free Software Foundation, Inc. 38dffb485Schristos 48dffb485Schristos This file is part of GDB. 58dffb485Schristos 68dffb485Schristos This program is free software; you can redistribute it and/or modify 78dffb485Schristos it under the terms of the GNU General Public License as published by 88dffb485Schristos the Free Software Foundation; either version 3 of the License, or 98dffb485Schristos (at your option) any later version. 108dffb485Schristos 118dffb485Schristos This program is distributed in the hope that it will be useful, 128dffb485Schristos but WITHOUT ANY WARRANTY; without even the implied warranty of 138dffb485Schristos MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 148dffb485Schristos GNU General Public License for more details. 158dffb485Schristos 168dffb485Schristos You should have received a copy of the GNU General Public License 178dffb485Schristos along with this program. If not, see <http://www.gnu.org/licenses/>. */ 188dffb485Schristos 198dffb485Schristos #ifndef COMMON_REFCOUNTED_OBJECT_H 208dffb485Schristos #define COMMON_REFCOUNTED_OBJECT_H 218dffb485Schristos 228dffb485Schristos /* Base class of intrusively reference-countable objects. 238dffb485Schristos Incrementing and decrementing the reference count is an external 248dffb485Schristos responsibility. */ 258dffb485Schristos 268dffb485Schristos class refcounted_object 278dffb485Schristos { 288dffb485Schristos public: 298dffb485Schristos refcounted_object () = default; 308dffb485Schristos 318dffb485Schristos /* Increase the refcount. */ 328dffb485Schristos void incref () 338dffb485Schristos { 348dffb485Schristos gdb_assert (m_refcount >= 0); 358dffb485Schristos m_refcount++; 368dffb485Schristos } 378dffb485Schristos 388dffb485Schristos /* Decrease the refcount. */ 398dffb485Schristos void decref () 408dffb485Schristos { 418dffb485Schristos m_refcount--; 428dffb485Schristos gdb_assert (m_refcount >= 0); 438dffb485Schristos } 448dffb485Schristos 458dffb485Schristos int refcount () const { return m_refcount; } 468dffb485Schristos 478dffb485Schristos private: 488dffb485Schristos DISABLE_COPY_AND_ASSIGN (refcounted_object); 498dffb485Schristos 508dffb485Schristos /* The reference count. */ 518dffb485Schristos int m_refcount = 0; 528dffb485Schristos }; 538dffb485Schristos 548dffb485Schristos /* A policy class to interface gdb::ref_ptr with a 558dffb485Schristos refcounted_object. */ 568dffb485Schristos 578dffb485Schristos struct refcounted_object_ref_policy 588dffb485Schristos { 598dffb485Schristos static void incref (refcounted_object *ptr) 608dffb485Schristos { 618dffb485Schristos ptr->incref (); 628dffb485Schristos } 638dffb485Schristos 648dffb485Schristos static void decref (refcounted_object *ptr) 658dffb485Schristos { 668dffb485Schristos ptr->decref (); 678dffb485Schristos } 688dffb485Schristos }; 698dffb485Schristos 70*5ba1f45fSchristos /* A policy class to interface gdb::ref_ptr with a refcounted_object, that 71*5ba1f45fSchristos deletes the object once the refcount reaches 0.. */ 72*5ba1f45fSchristos 73*5ba1f45fSchristos template<typename T> 74*5ba1f45fSchristos struct refcounted_object_delete_ref_policy 75*5ba1f45fSchristos { 76*5ba1f45fSchristos static void incref (T *obj) 77*5ba1f45fSchristos { obj->incref (); } 78*5ba1f45fSchristos 79*5ba1f45fSchristos static void decref (T *obj) 80*5ba1f45fSchristos { 81*5ba1f45fSchristos obj->decref (); 82*5ba1f45fSchristos if (obj->refcount () == 0) 83*5ba1f45fSchristos delete obj; 84*5ba1f45fSchristos } 85*5ba1f45fSchristos }; 86*5ba1f45fSchristos 878dffb485Schristos #endif /* COMMON_REFCOUNTED_OBJECT_H */ 88