PR libstdc++/80285 optimize std::make_shared for -fno-rtti

	PR libstdc++/80285
	* include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_ti): Define
	function to get unique fake std::type_info reference.
	(_Sp_counted_ptr_inplace::_M_get_deleter) [!__cpp_rtti]: Compare to
	_S_ti() fake reference.
	(__shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...)): Share
	single implementation with or without RTTI enable.
	[!__cpp_rtti]: Pass fake reference to _M_get_deleter.
	* testsuite/20_util/shared_ptr/creation/alloc.cc: Change expected
	allocation and deallocation counts.
	* testsuite/20_util/shared_ptr/creation/single_allocation.cc: New.
	* testsuite/20_util/shared_ptr/creation/single_allocation_no_rtti.cc:
	New.

From-SVN: r247905

3 files changed, 114 insertions, 3 deletions

diff --git a/libstdc++-v3/testsuite/20_util/shared_ptr/creation/alloc.cc b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/alloc.cc
index b17387f11bc..7e53e41a72f 100644
--- a/libstdc++-v3/testsuite/20_util/shared_ptr/creation/alloc.cc
+++ b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/alloc.cc
@@ -63,7 +63,7 @@ test01()
     VERIFY( p1.get() != 0 );
     VERIFY( p1.use_count() == 1 );
     VERIFY( A::ctor_count == 1 );
-    VERIFY( tracker_allocator_counter::get_allocation_count() > 0 );
+    VERIFY( tracker_allocator_counter::get_allocation_count() > sizeof(A) );
   }
   VERIFY( A::ctor_count == A::dtor_count );
   VERIFY( tracker_allocator_counter::get_allocation_count()
@@ -79,12 +79,12 @@ test02()
   
   p1 = std::allocate_shared<A>(tracker_allocator<A>(), 1);
   VERIFY( A::ctor_count == 1 );
-  VERIFY( tracker_allocator_counter::get_allocation_count() > 0 );
+  VERIFY( tracker_allocator_counter::get_allocation_count() > sizeof(A) );
 
   p1 = std::allocate_shared<A>(tracker_allocator<A>(), 1, 2.0);
   VERIFY( A::ctor_count == 2 );
   VERIFY( A::dtor_count == 1 );
-  VERIFY( tracker_allocator_counter::get_deallocation_count() > 0 );
+  VERIFY( tracker_allocator_counter::get_deallocation_count() > sizeof(A) );
 
   p1 = std::allocate_shared<A>(tracker_allocator<A>(), 1, 2.0, '3');
   VERIFY( A::ctor_count == 3 );
diff --git a/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation.cc b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation.cc
new file mode 100644
index 00000000000..51b6b1bc751
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation.cc
@@ -0,0 +1,55 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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.
+
+// This library 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 this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-do run { target c++11 } }
+
+#include <memory>
+#include <testsuite_hooks.h>
+
+int counter = 0;
+
+template<typename T>
+struct Alloc : std::allocator<T>
+{
+  template<typename U>
+    struct rebind { using other = Alloc<U>; };
+
+  Alloc() = default;
+
+  template<typename U>
+    Alloc(const Alloc<U>&) { }
+
+  T* allocate(std::size_t n)
+  {
+    ++counter;
+    return std::allocator<T>::allocate(n);
+  }
+};
+
+
+void
+test01()
+{
+  std::allocate_shared<int>(Alloc<int>());
+  VERIFY( counter == 1 );
+}
+
+int
+main()
+{
+  test01();
+}
diff --git a/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation_no_rtti.cc b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation_no_rtti.cc
new file mode 100644
index 00000000000..ba94f3cb90e
--- /dev/null
+++ b/libstdc++-v3/testsuite/20_util/shared_ptr/creation/single_allocation_no_rtti.cc
@@ -0,0 +1,56 @@
+// Copyright (C) 2017 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library 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.
+
+// This library 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 this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-fno-rtti" }
+// { dg-do run { target c++11 } }
+
+#include <memory>
+#include <testsuite_hooks.h>
+
+int counter = 0;
+
+template<typename T>
+struct Alloc : std::allocator<T>
+{
+  template<typename U>
+    struct rebind { using other = Alloc<U>; };
+
+  Alloc() = default;
+
+  template<typename U>
+    Alloc(const Alloc<U>&) { }
+
+  T* allocate(std::size_t n)
+  {
+    ++counter;
+    return std::allocator<T>::allocate(n);
+  }
+};
+
+
+void
+test01()
+{
+  std::allocate_shared<int>(Alloc<int>());
+  VERIFY( counter == 1 );
+}
+
+int
+main()
+{
+  test01();
+}