<commit_before>//===------------------------ memory_resource.cpp -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "experimental/memory_resource"

#ifndef _LIBCPP_HAS_NO_ATOMIC_HEADER
#include "atomic"
#elif !defined(_LIBCPP_HAS_NO_THREADS)
#include "mutex"
#endif

_LIBCPP_BEGIN_NAMESPACE_LFTS_PMR

// memory_resource

//memory_resource::~memory_resource() {}

// new_delete_resource()

class _LIBCPP_TYPE_VIS_ONLY __new_delete_memory_resource_imp
    : public memory_resource
{
public:
    ~__new_delete_memory_resource_imp() = default;

protected:
    virtual void* do_allocate(size_t __size, size_t __align)
        { return __allocate(__size); }

    virtual void do_deallocate(void * __p, size_t, size_t)
        { __deallocate(__p); }

    virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT
        { return &__other == this; }
};

// null_memory_resource()

class _LIBCPP_TYPE_VIS_ONLY __null_memory_resource_imp
    : public memory_resource
{
public:
    ~__null_memory_resource_imp() = default;

protected:
    virtual void* do_allocate(size_t, size_t) {
#ifndef _LIBCPP_NO_EXCEPTIONS
        throw std::bad_alloc();
#else
        abort();
#endif
    }
    virtual void do_deallocate(void *, size_t, size_t) {}
    virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT
    { return &__other == this; }
};

union ResourceInitHelper {
  struct {
    __new_delete_memory_resource_imp new_delete_res;
    __null_memory_resource_imp       null_res;
  } resources;
  char dummy;
  _LIBCPP_CONSTEXPR_AFTER_CXX11 ResourceInitHelper() : resources() {}
  ~ResourceInitHelper() {}
};
// When compiled in C++14 this initialization should be a constant expression.
// Only in C++11 is "init_priority" needed to ensure initialization order.
ResourceInitHelper res_init __attribute__((init_priority (101)));

memory_resource * new_delete_resource() _NOEXCEPT {
    return &res_init.resources.new_delete_res;
}<commit_msg>Hide some internal symbols for memory resource.<commit_after>//===------------------------ memory_resource.cpp -------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "experimental/memory_resource"

#ifndef _LIBCPP_HAS_NO_ATOMIC_HEADER
#include "atomic"
#elif !defined(_LIBCPP_HAS_NO_THREADS)
#include "mutex"
#endif

_LIBCPP_BEGIN_NAMESPACE_LFTS_PMR

// memory_resource

//memory_resource::~memory_resource() {}

// new_delete_resource()

class _LIBCPP_TYPE_VIS_ONLY __new_delete_memory_resource_imp
    : public memory_resource
{
public:
    ~__new_delete_memory_resource_imp() = default;

protected:
    virtual void* do_allocate(size_t __size, size_t __align)
        { return __allocate(__size); }

    virtual void do_deallocate(void * __p, size_t, size_t)
        { __deallocate(__p); }

    virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT
        { return &__other == this; }
};

// null_memory_resource()

class _LIBCPP_TYPE_VIS_ONLY __null_memory_resource_imp
    : public memory_resource
{
public:
    ~__null_memory_resource_imp() = default;

protected:
    virtual void* do_allocate(size_t, size_t) {
#ifndef _LIBCPP_NO_EXCEPTIONS
        throw std::bad_alloc();
#else
        abort();
#endif
    }
    virtual void do_deallocate(void *, size_t, size_t) {}
    virtual bool do_is_equal(memory_resource const & __other) const _NOEXCEPT
    { return &__other == this; }
};

namespace {

union ResourceInitHelper {
  struct {
    __new_delete_memory_resource_imp new_delete_res;
    __null_memory_resource_imp       null_res;
  } resources;
  char dummy;
  _LIBCPP_CONSTEXPR_AFTER_CXX11 ResourceInitHelper() : resources() {}
  ~ResourceInitHelper() {}
};
// When compiled in C++14 this initialization should be a constant expression.
// Only in C++11 is "init_priority" needed to ensure initialization order.
ResourceInitHelper res_init __attribute__((init_priority (101)));

} // end namespace


memory_resource * new_delete_resource() _NOEXCEPT {
    return &res_init.resources.new_delete_res;
}
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