Add gnu::unique_ptr
This is a version of the patch posted by Trevor Saunders on 2017-07-31, for which he wrote: > For most of the history of this see > https://sourceware.org/ml/gdb-patches/2016-10/msg00223.html > The changes are mostly s/gdb/gtl/g This version was updated by me (dmalcolm) adding these changes: - renaming of "gtl" to "gnu" (3 letters, and one of the ones Richi proposed, and not a match for "*tl") - renaming of DEFINE_GDB_UNIQUE_PTR to DEFINE_GNU_UNIQUE_PTR - renaming of xfree_deleter to xmalloc_deleter, and making it use "free" rather than "xfree" (which doesn't exist) - added a gcc/unique-ptr-tests.cc - implement unique_xmalloc_ptr<T[]> (taken from gdb, but changing "xfree" to "free", and adding support for pre-C++-11) gcc/ChangeLog: David Malcolm <dmalcolm@redhat.com> * Makefile.in (OBJS): Add unique-ptr-tests.o. * selftest-run-tests.c (selftest::run_tests): Call selftest::unique_ptr_tests_cc_tests. * selftest.h (selftest::unique_ptr_tests_cc_tests): New decl. * unique-ptr-tests.cc: New file. include/ChangeLog: Trevor Saunders <tbsaunde+gcc@tbsaunde.org> David Malcolm <dmalcolm@redhat.com> * unique-ptr.h: New file. From-SVN: r253797
This commit is contained in:
David Malcolm
parent
2de3d3c6a6
commit
46d2b77d71
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@ -1,3 +1,11 @@
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2017-10-16 David Malcolm <dmalcolm@redhat.com>
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* Makefile.in (OBJS): Add unique-ptr-tests.o.
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* selftest-run-tests.c (selftest::run_tests): Call
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selftest::unique_ptr_tests_cc_tests.
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* selftest.h (selftest::unique_ptr_tests_cc_tests): New decl.
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* unique-ptr-tests.cc: New file.
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2017-10-16 Vladimir Makarov <vmakarov@redhat.com>
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PR sanitizer/82353
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@ -1568,6 +1568,7 @@ OBJS = \
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tree-vrp.o \
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tree.o \
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typed-splay-tree.o \
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unique-ptr-tests.o \
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valtrack.o \
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value-prof.o \
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var-tracking.o \
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@ -67,6 +67,7 @@ selftest::run_tests ()
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sreal_c_tests ();
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fibonacci_heap_c_tests ();
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typed_splay_tree_c_tests ();
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unique_ptr_tests_cc_tests ();
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/* Mid-level data structures. */
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input_c_tests ();
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@ -195,6 +195,7 @@ extern void store_merging_c_tests ();
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extern void typed_splay_tree_c_tests ();
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extern void tree_c_tests ();
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extern void tree_cfg_c_tests ();
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extern void unique_ptr_tests_cc_tests ();
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extern void vec_c_tests ();
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extern void wide_int_cc_tests ();
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extern void predict_c_tests ();
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@ -0,0 +1,234 @@
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/* Unit tests for unique-ptr.h.
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Copyright (C) 2017 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "unique-ptr.h"
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#include "selftest.h"
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#if CHECKING_P
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namespace selftest {
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namespace {
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/* A class for counting ctor and dtor invocations. */
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struct stats
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{
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stats () : ctor_count (0), dtor_count (0) {}
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int ctor_count;
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int dtor_count;
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};
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/* A class that uses "stats" to track its ctor and dtor invocations. */
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class foo
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{
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public:
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foo (stats &s) : m_s (s) { ++m_s.ctor_count; }
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~foo () { ++m_s.dtor_count; }
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int example_method () const { return 42; }
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private:
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foo (const foo&);
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foo & operator= (const foo &);
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private:
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stats &m_s;
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};
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/* A struct for testing unique_ptr<T[]>. */
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struct has_default_ctor
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{
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has_default_ctor () : m_field (42) {}
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int m_field;
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};
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/* A dummy struct for testing unique_xmalloc_ptr. */
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struct dummy
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{
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int field;
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};
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} // anonymous namespace
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/* Verify that the default ctor inits ptrs to NULL. */
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static void
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test_null_ptr ()
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{
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gnu::unique_ptr<void *> p;
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ASSERT_EQ (NULL, p);
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gnu::unique_xmalloc_ptr<void *> q;
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ASSERT_EQ (NULL, q);
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}
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/* Verify that deletion happens when a unique_ptr goes out of scope. */
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static void
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test_implicit_deletion ()
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{
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stats s;
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ASSERT_EQ (0, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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{
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gnu::unique_ptr<foo> f (new foo (s));
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ASSERT_NE (NULL, f);
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ASSERT_EQ (1, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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}
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/* Verify that the foo was implicitly deleted. */
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ASSERT_EQ (1, s.ctor_count);
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ASSERT_EQ (1, s.dtor_count);
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}
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/* Verify that we can assign to a NULL unique_ptr. */
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static void
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test_overwrite_of_null ()
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{
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stats s;
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ASSERT_EQ (0, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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{
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gnu::unique_ptr<foo> f;
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ASSERT_EQ (NULL, f);
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ASSERT_EQ (0, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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/* Overwrite with a non-NULL value. */
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f = gnu::unique_ptr<foo> (new foo (s));
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ASSERT_EQ (1, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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}
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/* Verify that the foo is implicitly deleted. */
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ASSERT_EQ (1, s.ctor_count);
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ASSERT_EQ (1, s.dtor_count);
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}
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/* Verify that we can assign to a non-NULL unique_ptr. */
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static void
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test_overwrite_of_non_null ()
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{
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stats s;
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ASSERT_EQ (0, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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{
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gnu::unique_ptr<foo> f (new foo (s));
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ASSERT_NE (NULL, f);
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ASSERT_EQ (1, s.ctor_count);
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ASSERT_EQ (0, s.dtor_count);
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/* Overwrite with a different value. */
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f = gnu::unique_ptr<foo> (new foo (s));
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ASSERT_EQ (2, s.ctor_count);
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ASSERT_EQ (1, s.dtor_count);
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}
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/* Verify that the 2nd foo was implicitly deleted. */
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ASSERT_EQ (2, s.ctor_count);
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ASSERT_EQ (2, s.dtor_count);
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}
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/* Verify that unique_ptr's overloaded ops work. */
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static void
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test_overloaded_ops ()
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{
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stats s;
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gnu::unique_ptr<foo> f (new foo (s));
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ASSERT_EQ (42, f->example_method ());
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ASSERT_EQ (42, (*f).example_method ());
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ASSERT_EQ (f, f);
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ASSERT_NE (NULL, f.get ());
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gnu::unique_ptr<foo> g (new foo (s));
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ASSERT_NE (f, g);
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}
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/* Verify that the gnu::unique_ptr specialization for T[] works. */
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static void
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test_array_new ()
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{
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const int num = 10;
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gnu::unique_ptr<has_default_ctor[]> p (new has_default_ctor[num]);
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ASSERT_NE (NULL, p.get ());
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/* Verify that operator[] works, and that the default ctor was called
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on each element. */
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for (int i = 0; i < num; i++)
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ASSERT_EQ (42, p[i].m_field);
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}
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/* Verify that gnu::unique_xmalloc_ptr works. */
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static void
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test_xmalloc ()
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{
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gnu::unique_xmalloc_ptr<dummy> p (XNEW (dummy));
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ASSERT_NE (NULL, p.get ());
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}
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/* Verify the gnu::unique_xmalloc_ptr specialization for T[]. */
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static void
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test_xmalloc_array ()
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{
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const int num = 10;
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gnu::unique_xmalloc_ptr<dummy[]> p (XNEWVEC (dummy, num));
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ASSERT_NE (NULL, p.get ());
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/* Verify that operator[] works. */
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for (int i = 0; i < num; i++)
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p[i].field = 42;
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for (int i = 0; i < num; i++)
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ASSERT_EQ (42, p[i].field);
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}
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/* Run all of the selftests within this file. */
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void
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unique_ptr_tests_cc_tests ()
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{
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test_null_ptr ();
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test_implicit_deletion ();
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test_overwrite_of_null ();
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test_overwrite_of_non_null ();
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test_overloaded_ops ();
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test_array_new ();
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test_xmalloc ();
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test_xmalloc_array ();
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}
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} // namespace selftest
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#endif /* #if CHECKING_P */
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@ -1,3 +1,8 @@
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2017-10-16 Trevor Saunders <tbsaunde+gcc@tbsaunde.org>
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David Malcolm <dmalcolm@redhat.com>
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* unique-ptr.h: New file.
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2017-09-15 Yao Qi <yao.qi@linaro.org>
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Pedro Alves <palves@redhat.com>
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@ -0,0 +1,403 @@
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/* gnu::unique_ptr, a simple std::unique_ptr replacement for C++03.
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Copyright (C) 2007-2016 Free Software Foundation, Inc.
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This file is part of GCC.
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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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/* gnu::unique_ptr defines a C++ owning smart pointer that exposes a
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subset of the std::unique_ptr API.
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In fact, when compiled with a C++11 compiler, gnu::unique_ptr
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actually _is_ std::unique_ptr. When compiled with a C++03 compiler
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OTOH, it's an hand coded std::unique_ptr emulation that assumes
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code is correct and doesn't try to be too smart.
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This supports custom deleters, but not _stateful_ deleters, so you
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can't use those in C++11 mode either. Only the managed pointer is
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stored in the smart pointer. That could be changed; it simply
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wasn't found necessary.
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At the end of the file you'll find a gnu::unique_ptr partial
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specialization that uses a custom (stateless) deleter:
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gnu::unique_xmalloc_ptr. That is used to manage pointers to
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objects allocated with xmalloc.
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The C++03 version was originally based on GCC 7.0's std::auto_ptr
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and then heavily customized to behave more like C++11's
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std::unique_ptr, but at this point, it no longer shares much at all
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with the original file. But, that's the history and the reason for
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the copyright's starting year.
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The C++03 version lets you shoot yourself in the foot, since
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similarly to std::auto_ptr, the copy constructor and assignment
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operators actually move. Also, in the name of simplicity, no
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effort is spent on using SFINAE to prevent invalid conversions,
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etc. This is not really a problem, because the goal here is to
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allow code that would be correct using std::unique_ptr to be
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equally correct in C++03 mode, and, just as efficient. If client
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code compiles correctly with a C++11 (or newer) compiler, we know
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we're not doing anything invalid by mistake.
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Usage notes:
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- Putting gnu::unique_ptr in standard containers is not supported,
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since C++03 containers are not move-aware (and our emulation
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relies on copy actually moving).
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- Since there's no nullptr in C++03, gnu::unique_ptr allows
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implicit initialization and assignment from NULL instead.
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- To check whether there's an associated managed object, all these
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work as expected:
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if (ptr)
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if (!ptr)
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if (ptr != NULL)
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if (ptr == NULL)
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if (NULL != ptr)
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if (NULL == ptr)
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*/
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#ifndef GNU_UNIQUE_PTR_H
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#define GNU_UNIQUE_PTR_H 1
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#include <memory>
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namespace gnu
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{
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#if __cplusplus >= 201103
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/* In C++11 mode, all we need is import the standard
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std::unique_ptr. */
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template<typename T> using unique_ptr = std::unique_ptr<T>;
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/* Pull in move as well. */
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using std::move;
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#else /* C++11 */
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/* Default destruction policy used by gnu::unique_ptr when no deleter
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is specified. Uses delete. */
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template<typename T>
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struct default_delete
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{
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void operator () (T *ptr) const { delete ptr; }
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};
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/* Specialization for arrays. Uses delete[]. */
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template<typename T>
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struct default_delete<T[]>
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{
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void operator () (T *ptr) const { delete [] ptr; }
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};
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namespace detail
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{
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/* Type used to support implicit construction from NULL:
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gnu::unique_ptr<foo> func (....)
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{
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return NULL;
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}
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and assignment from NULL:
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gnu::unique_ptr<foo> ptr (....);
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...
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ptr = NULL;
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It is intentionally not defined anywhere. */
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struct nullptr_t;
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/* Base class of our unique_ptr emulation. Contains code common to
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both unique_ptr<T, D> and unique_ptr<T[], D>. */
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template<typename T, typename D>
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class unique_ptr_base
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{
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public:
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typedef T *pointer;
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typedef T element_type;
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typedef D deleter_type;
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/* Takes ownership of a pointer. P is a pointer to an object of
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element_type type. Defaults to NULL. */
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explicit unique_ptr_base (element_type *p = NULL) throw () : m_ptr (p) {}
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/* The "move" constructor. Really a copy constructor that actually
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moves. Even though std::unique_ptr is not copyable, our little
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simpler emulation allows it, because:
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- There are no rvalue references in C++03. Our move emulation
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instead relies on copy/assignment moving, like std::auto_ptr.
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- RVO/NRVO requires an accessible copy constructor
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*/
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unique_ptr_base (const unique_ptr_base &other) throw ()
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: m_ptr (const_cast<unique_ptr_base &> (other).release ()) {}
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/* Converting "move" constructor. Really an lvalue ref converting
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constructor that actually moves. This allows constructs such as:
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unique_ptr<Derived> func_returning_unique_ptr (.....);
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...
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unique_ptr<Base> ptr = func_returning_unique_ptr (.....);
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*/
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template<typename T1, typename D1>
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unique_ptr_base (const unique_ptr_base<T1, D1> &other) throw ()
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: m_ptr (const_cast<unique_ptr_base<T1, D1> &> (other).release ()) {}
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/* The "move" assignment operator. Really an lvalue ref copy
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assignment operator that actually moves. See comments above. */
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unique_ptr_base &operator= (const unique_ptr_base &other) throw ()
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{
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reset (const_cast<unique_ptr_base &> (other).release ());
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return *this;
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}
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/* Converting "move" assignment. Really an lvalue ref converting
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copy assignment operator that moves. See comments above. */
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template<typename T1, typename D1>
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unique_ptr_base &operator= (const unique_ptr_base<T1, D1> &other) throw ()
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{
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reset (const_cast<unique_ptr_base<T1, D1> &> (other).release ());
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return *this;
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}
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/* std::unique_ptr does not allow assignment, except from nullptr.
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nullptr doesn't exist in C++03, so we allow assignment from NULL
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instead [ptr = NULL;].
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*/
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unique_ptr_base &operator= (detail::nullptr_t *) throw ()
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{
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reset ();
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return *this;
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}
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~unique_ptr_base () { call_deleter (); }
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/* "explicit operator bool ()" emulation using the safe bool
|
||||
idiom. */
|
||||
private:
|
||||
typedef void (unique_ptr_base::*explicit_operator_bool) () const;
|
||||
void this_type_does_not_support_comparisons () const {}
|
||||
|
||||
public:
|
||||
operator explicit_operator_bool () const
|
||||
{
|
||||
return (m_ptr != NULL
|
||||
? &unique_ptr_base::this_type_does_not_support_comparisons
|
||||
: 0);
|
||||
}
|
||||
|
||||
element_type *get () const throw () { return m_ptr; }
|
||||
|
||||
element_type *release () throw ()
|
||||
{
|
||||
pointer tmp = m_ptr;
|
||||
m_ptr = NULL;
|
||||
return tmp;
|
||||
}
|
||||
|
||||
void reset (element_type *p = NULL) throw ()
|
||||
{
|
||||
if (p != m_ptr)
|
||||
{
|
||||
call_deleter ();
|
||||
m_ptr = p;
|
||||
}
|
||||
}
|
||||
|
||||
private:
|
||||
|
||||
/* Call the deleter. Note we assume the deleter is "stateless". */
|
||||
void call_deleter ()
|
||||
{
|
||||
D d;
|
||||
|
||||
d (m_ptr);
|
||||
}
|
||||
|
||||
element_type *m_ptr;
|
||||
};
|
||||
|
||||
} /* namespace detail */
|
||||
|
||||
/* Macro used to create a unique_ptr_base "partial specialization" --
|
||||
a subclass that uses a specific deleter. Basically this re-defines
|
||||
the necessary constructors. This is necessary because C++03
|
||||
doesn't support inheriting constructors with "using". While at it,
|
||||
we inherit the assignment operator. TYPE is the name of the type
|
||||
being defined. Assumes that 'base_type' is a typedef of the
|
||||
baseclass TYPE is inheriting from. */
|
||||
#define DEFINE_GNU_UNIQUE_PTR(TYPE) \
|
||||
public: \
|
||||
explicit TYPE (T *p = NULL) throw () \
|
||||
: base_type (p) {} \
|
||||
\
|
||||
TYPE (const TYPE &other) throw () : base_type (other) {} \
|
||||
\
|
||||
TYPE (detail::nullptr_t *) throw () : base_type (NULL) {} \
|
||||
\
|
||||
template<typename T1, typename D1> \
|
||||
TYPE (const detail::unique_ptr_base<T1, D1> &other) throw () \
|
||||
: base_type (other) {} \
|
||||
\
|
||||
using base_type::operator=;
|
||||
|
||||
/* Define single-object gnu::unique_ptr. */
|
||||
|
||||
template <typename T, typename D = default_delete<T> >
|
||||
class unique_ptr : public detail::unique_ptr_base<T, D>
|
||||
{
|
||||
typedef detail::unique_ptr_base<T, D> base_type;
|
||||
|
||||
DEFINE_GNU_UNIQUE_PTR (unique_ptr)
|
||||
|
||||
public:
|
||||
/* Dereferencing. */
|
||||
T &operator* () const throw () { return *this->get (); }
|
||||
T *operator-> () const throw () { return this->get (); }
|
||||
};
|
||||
|
||||
/* Define gnu::unique_ptr specialization for T[]. */
|
||||
|
||||
template <typename T, typename D>
|
||||
class unique_ptr<T[], D> : public detail::unique_ptr_base<T, D>
|
||||
{
|
||||
typedef detail::unique_ptr_base<T, D> base_type;
|
||||
|
||||
DEFINE_GNU_UNIQUE_PTR (unique_ptr)
|
||||
|
||||
public:
|
||||
/* Indexing operator. */
|
||||
T &operator[] (size_t i) const { return this->get ()[i]; }
|
||||
};
|
||||
|
||||
/* Comparison operators. */
|
||||
|
||||
template <typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator== (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return x.get() == y.get(); }
|
||||
|
||||
template <typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator!= (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return x.get() != y.get(); }
|
||||
|
||||
template<typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator< (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return x.get() < y.get (); }
|
||||
|
||||
template<typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator<= (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return !(y < x); }
|
||||
|
||||
template<typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator> (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return y < x; }
|
||||
|
||||
template<typename T, typename D,
|
||||
typename U, typename E>
|
||||
inline bool
|
||||
operator>= (const detail::unique_ptr_base<T, D> &x,
|
||||
const detail::unique_ptr_base<U, E> &y)
|
||||
{ return !(x < y); }
|
||||
|
||||
/* std::move "emulation". This is as simple as it can be -- no
|
||||
attempt is made to emulate rvalue references. Instead relies on
|
||||
the fact that gnu::unique_ptr has move semantics like
|
||||
std::auto_ptr. I.e., copy/assignment actually moves. */
|
||||
|
||||
template<typename T, typename D>
|
||||
unique_ptr<T, D>
|
||||
move (unique_ptr<T, D> v)
|
||||
{
|
||||
return v;
|
||||
}
|
||||
|
||||
#endif /* C++11 */
|
||||
|
||||
/* Define gnu::unique_xmalloc_ptr, a gnu::unique_ptr that manages
|
||||
xmalloc'ed memory. */
|
||||
|
||||
/* The deleter for gnu::unique_xmalloc_ptr. Uses free. */
|
||||
template <typename T>
|
||||
struct xmalloc_deleter
|
||||
{
|
||||
void operator() (T *ptr) const { free (ptr); }
|
||||
};
|
||||
|
||||
/* Same, for arrays. */
|
||||
template <typename T>
|
||||
struct xmalloc_deleter<T[]>
|
||||
{
|
||||
void operator() (T *ptr) const { free (ptr); }
|
||||
};
|
||||
|
||||
#if __cplusplus >= 201103
|
||||
|
||||
/* In C++11, we just import the standard unique_ptr to our namespace
|
||||
with a custom deleter. */
|
||||
|
||||
template<typename T> using unique_xmalloc_ptr
|
||||
= std::unique_ptr<T, xmalloc_deleter<T>>;
|
||||
|
||||
#else /* C++11 */
|
||||
|
||||
/* In C++03, we don't have template aliases, so we need to define a
|
||||
subclass instead, and re-define the constructors, because C++03
|
||||
doesn't support inheriting constructors either. */
|
||||
|
||||
template <typename T>
|
||||
class unique_xmalloc_ptr : public unique_ptr<T, xmalloc_deleter<T> >
|
||||
{
|
||||
typedef unique_ptr<T, xmalloc_deleter<T> > base_type;
|
||||
|
||||
DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
|
||||
};
|
||||
|
||||
/* Define gnu::unique_xmalloc_ptr specialization for T[]. */
|
||||
|
||||
template <typename T>
|
||||
class unique_xmalloc_ptr<T[]> : public unique_ptr<T[], xmalloc_deleter<T[]> >
|
||||
{
|
||||
typedef unique_ptr<T[], xmalloc_deleter<T[]> > base_type;
|
||||
|
||||
DEFINE_GNU_UNIQUE_PTR (unique_xmalloc_ptr)
|
||||
};
|
||||
|
||||
#endif /* C++11 */
|
||||
|
||||
} /* namespace gnu */
|
||||
|
||||
#endif /* GNU_UNIQUE_PTR_H */
|
||||
Loading…
Reference in New Issue