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// Copyright (C) 2018-2024 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++17 } }
#include <memory_resource>
#include <testsuite_allocator.h>
struct resource : __gnu_test::memory_resource
{
int allocate_calls = 0;
int deallocate_calls = 0;
void*
do_allocate(std::size_t bytes, std::size_t align) override
{
++allocate_calls;
return __gnu_test::memory_resource::do_allocate(bytes, align);
}
void
do_deallocate(void* p, std::size_t bytes, std::size_t align) override
{
++deallocate_calls;
__gnu_test::memory_resource::do_deallocate(p, bytes, align);
}
};
void
test01()
{
resource r;
std::pmr::monotonic_buffer_resource mbr(&r);
auto p = mbr.allocate(10, 16);
mbr.deallocate(p, 1, 2);
VERIFY( r.deallocate_calls == 0 );
p = mbr.allocate(10, 16);
p = mbr.allocate(10, 16);
p = mbr.allocate(10, 16);
p = mbr.allocate(1024, 64);
p = mbr.allocate(1024, 64);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
p = mbr.allocate(128, 8);
mbr.deallocate(p, 1, 2);
p = mbr.allocate(1024, 16);
p = mbr.allocate(1024, 16);
mbr.deallocate(p, 1, 2);
VERIFY( r.deallocate_calls == 0 );
mbr.release();
VERIFY( r.deallocate_calls != 0 );
VERIFY( r.deallocate_calls == r.allocate_calls );
VERIFY( mbr.upstream_resource() == &r );
VERIFY( r.number_of_active_allocations() == 0 );
}
void
test02()
{
std::pmr::monotonic_buffer_resource mbr; // uses get_default_resource()
auto* const upstream = mbr.upstream_resource();
resource r;
__gnu_test::default_resource_mgr _(&r); // calls set_default_resource(&r)
mbr.release();
// release() doesn't change upstream resource:
VERIFY( mbr.upstream_resource() == upstream );
}
void
test03()
{
resource r;
__gnu_test::default_resource_mgr _(&r);
std::pmr::monotonic_buffer_resource mbr(16);
for (int i = 0; i < 100; ++i)
(void) mbr.allocate(4, 1);
const int allocations = r.allocate_calls;
VERIFY( allocations != 0 );
mbr.release();
VERIFY( r.allocate_calls == r.deallocate_calls );
VERIFY( r.number_of_active_allocations() == 0 );
// next_buffer_size should have been reset to the initial value,
// so the allocations from upstream should be the same as before.
r.allocate_calls = 0;
r.deallocate_calls = 0;
for (int i = 0; i < 100; ++i)
(void) mbr.allocate(4,1);
VERIFY( allocations == r.allocate_calls );
}
void
test04()
{
resource r;
unsigned char buffer[1024];
std::pmr::monotonic_buffer_resource mbr(buffer, sizeof(buffer), &r);
void* p = mbr.allocate(800, 16);
VERIFY( p >= buffer && p < (buffer + 16) );
void* const p_in_buffer = p;
VERIFY( r.allocate_calls == 0 );
p = mbr.allocate(300, 1);
VERIFY( p != buffer );
VERIFY( p != buffer );
VERIFY( r.allocate_calls == 1 );
mbr.release();
VERIFY( r.deallocate_calls == 1 );
VERIFY( mbr.upstream_resource() == &r );
VERIFY( r.number_of_active_allocations() == 0 );
// initial buffer should be used again now:
p = mbr.allocate(1000, 16);
VERIFY( p == p_in_buffer );
VERIFY( r.allocate_calls == 1 );
}
void
test05() // LWG 3120
{
char buffer[100];
{
std::pmr::monotonic_buffer_resource mr(buffer, sizeof(buffer),
std::pmr::null_memory_resource());
mr.release();
(void) mr.allocate(60);
}
{
std::pmr::monotonic_buffer_resource mr(buffer, sizeof(buffer),
std::pmr::null_memory_resource());
(void) mr.allocate(60);
mr.release();
(void) mr.allocate(60);
}
{
resource r;
std::pmr::monotonic_buffer_resource mr(&r);
for (int i = 0; i < 100; ++i)
{
(void) mr.allocate(1);
mr.release();
}
VERIFY( r.number_of_active_allocations() == 0 );
}
}
int
main()
{
test01();
test02();
test03();
test04();
test05();
}
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