01027315f5
This patch moves the gdbsupport directory to the top level. This is the next step in the ongoing project to move gdbserver to the top level. The bulk of this patch was created by "git mv gdb/gdbsupport gdbsupport". This patch then adds a build system to gdbsupport and wires it into the top level. Then it changes gdb to use the top-level build. gdbserver, on the other hand, is not yet changed. It still does its own build of gdbsupport. ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * src-release.sh (GDB_SUPPORT_DIRS): Add gdbsupport. * MAINTAINERS: Add gdbsupport. * configure: Rebuild. * configure.ac (configdirs): Add gdbsupport. * gdbsupport: New directory, move from gdb/gdbsupport. * Makefile.def (host_modules, dependencies): Add gnulib. * Makefile.in: Rebuild. gdb/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * nat/x86-linux-dregs.c: Include configh.h. * nat/linux-ptrace.c: Include configh.h. * nat/linux-btrace.c: Include configh.h. * defs.h: Include config.h, bfd.h. * configure.ac: Don't source common.host. (CONFIG_OBS, CONFIG_SRCS): Remove gdbsupport files. * configure: Rebuild. * acinclude.m4: Update path. * Makefile.in (SUPPORT, LIBSUPPORT, INCSUPPORT): New variables. (CONFIG_SRC_SUBDIR): Remove gdbsupport. (INTERNAL_CFLAGS_BASE): Add INCSUPPORT. (CLIBS): Add LIBSUPPORT. (CDEPS): Likewise. (COMMON_SFILES): Remove gdbsupport files. (HFILES_NO_SRCDIR): Likewise. (stamp-version): Update path to create-version.sh. (ALLDEPFILES): Remove gdbsupport files. gdb/gdbserver/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * server.h: Include config.h. * gdbreplay.c: Include config.h. * configure: Rebuild. * configure.ac: Don't source common.host. * acinclude.m4: Update path. * Makefile.in (INCSUPPORT): New variable. (INCLUDE_CFLAGS): Add INCSUPPORT. (SFILES): Update paths. (version-generated.c): Update path to create-version.sh. (gdbsupport/%-ipa.o, gdbsupport/%.o): Update paths. gdbsupport/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * common-defs.h: Add GDBSERVER case. Update includes. * acinclude.m4, aclocal.m4, config.in, configure, configure.ac, Makefile.am, Makefile.in, README: New files. * Moved from ../gdb/gdbsupport/ Change-Id: I07632e7798635c1bab389bf885971e584fb4bb78
229 lines
5.4 KiB
C++
229 lines
5.4 KiB
C++
/* Reference-counted smart pointer class
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Copyright (C) 2016-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef COMMON_GDB_REF_PTR_H
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#define COMMON_GDB_REF_PTR_H
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#include <cstddef>
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namespace gdb
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{
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/* An instance of this class either holds a reference to a
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reference-counted object or is "NULL". Reference counting is
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handled externally by a policy class. If the object holds a
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reference, then when the object is destroyed, the reference is
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decref'd.
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Normally an instance is constructed using a pointer. This sort of
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initialization lets this class manage the lifetime of that
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reference.
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Assignment and copy construction will make a new reference as
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appropriate. Assignment from a plain pointer is disallowed to
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avoid confusion about whether this acquires a new reference;
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instead use the "reset" method -- which, like the pointer
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constructor, transfers ownership.
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The policy class must provide two static methods:
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void incref (T *);
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void decref (T *);
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*/
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template<typename T, typename Policy>
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class ref_ptr
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{
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public:
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/* Create a new NULL instance. */
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ref_ptr ()
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: m_obj (NULL)
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{
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}
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/* Create a new NULL instance. Note that this is not explicit. */
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ref_ptr (const std::nullptr_t)
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: m_obj (NULL)
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{
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}
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/* Create a new instance. OBJ is a reference, management of which
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is now transferred to this class. */
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explicit ref_ptr (T *obj)
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: m_obj (obj)
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{
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}
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/* Copy another instance. */
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ref_ptr (const ref_ptr &other)
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: m_obj (other.m_obj)
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{
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if (m_obj != NULL)
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Policy::incref (m_obj);
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}
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/* Transfer ownership from OTHER. */
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ref_ptr (ref_ptr &&other)
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: m_obj (other.m_obj)
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{
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other.m_obj = NULL;
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}
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/* Destroy this instance. */
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~ref_ptr ()
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{
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if (m_obj != NULL)
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Policy::decref (m_obj);
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}
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/* Copy another instance. */
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ref_ptr &operator= (const ref_ptr &other)
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{
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/* Do nothing on self-assignment. */
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if (this != &other)
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{
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reset (other.m_obj);
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if (m_obj != NULL)
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Policy::incref (m_obj);
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}
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return *this;
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}
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/* Transfer ownership from OTHER. */
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ref_ptr &operator= (ref_ptr &&other)
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{
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/* Do nothing on self-assignment. */
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if (this != &other)
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{
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reset (other.m_obj);
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other.m_obj = NULL;
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}
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return *this;
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}
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/* Change this instance's referent. OBJ is a reference, management
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of which is now transferred to this class. */
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void reset (T *obj)
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{
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if (m_obj != NULL)
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Policy::decref (m_obj);
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m_obj = obj;
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}
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/* Return this instance's referent without changing the state of
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this class. */
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T *get () const
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{
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return m_obj;
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}
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/* Return this instance's referent, and stop managing this
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reference. The caller is now responsible for the ownership of
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the reference. */
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ATTRIBUTE_UNUSED_RESULT T *release ()
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{
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T *result = m_obj;
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m_obj = NULL;
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return result;
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}
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/* Let users refer to members of the underlying pointer. */
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T *operator-> () const
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{
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return m_obj;
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}
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/* Acquire a new reference and return a ref_ptr that owns it. */
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static ref_ptr<T, Policy> new_reference (T *obj)
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{
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Policy::incref (obj);
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return ref_ptr<T, Policy> (obj);
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}
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private:
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T *m_obj;
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};
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template<typename T, typename Policy>
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inline bool operator== (const ref_ptr<T, Policy> &lhs,
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const ref_ptr<T, Policy> &rhs)
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{
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return lhs.get () == rhs.get ();
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}
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template<typename T, typename Policy>
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inline bool operator== (const ref_ptr<T, Policy> &lhs, const T *rhs)
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{
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return lhs.get () == rhs;
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}
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template<typename T, typename Policy>
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inline bool operator== (const ref_ptr<T, Policy> &lhs, const std::nullptr_t)
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{
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return lhs.get () == nullptr;
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}
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template<typename T, typename Policy>
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inline bool operator== (const T *lhs, const ref_ptr<T, Policy> &rhs)
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{
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return lhs == rhs.get ();
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}
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template<typename T, typename Policy>
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inline bool operator== (const std::nullptr_t, const ref_ptr<T, Policy> &rhs)
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{
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return nullptr == rhs.get ();
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}
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template<typename T, typename Policy>
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inline bool operator!= (const ref_ptr<T, Policy> &lhs,
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const ref_ptr<T, Policy> &rhs)
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{
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return lhs.get () != rhs.get ();
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}
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template<typename T, typename Policy>
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inline bool operator!= (const ref_ptr<T, Policy> &lhs, const T *rhs)
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{
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return lhs.get () != rhs;
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}
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template<typename T, typename Policy>
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inline bool operator!= (const ref_ptr<T, Policy> &lhs, const std::nullptr_t)
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{
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return lhs.get () != nullptr;
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}
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template<typename T, typename Policy>
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inline bool operator!= (const T *lhs, const ref_ptr<T, Policy> &rhs)
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{
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return lhs != rhs.get ();
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}
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template<typename T, typename Policy>
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inline bool operator!= (const std::nullptr_t, const ref_ptr<T, Policy> &rhs)
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{
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return nullptr != rhs.get ();
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}
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}
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#endif /* COMMON_GDB_REF_PTR_H */
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