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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <algorithm>
#include <new>
#include <string.h>
#include <osl/diagnose.h>
#include <rtl/alloc.h>
// AllocatorTraits
namespace
{
struct AllocatorTraits
{
typedef char const signature_type[8];
const signature_type & m_signature;
explicit AllocatorTraits (signature_type const & s)
: m_signature (s)
{}
std::size_t size (std::size_t n) const
{
n = std::max(n, std::size_t(1));
#if OSL_DEBUG_LEVEL > 0
n += sizeof(signature_type);
#endif /* OSL_DEBUG_LEVEL */
return n;
}
void* init (void * p) const
{
#if OSL_DEBUG_LEVEL > 0
memcpy (p, m_signature, sizeof(signature_type));
p = static_cast<char*>(p) + sizeof(signature_type);
#endif /* OSL_DEBUG_LEVEL */
return p;
}
void* fini (void * p) const
{
#if OSL_DEBUG_LEVEL > 0
p = static_cast<char*>(p) - sizeof(signature_type);
if (memcmp (p, m_signature, sizeof(signature_type)) != 0)
{
OSL_FAIL("operator delete mismatch");
}
#endif /* OSL_DEBUG_LEVEL */
return p;
}
};
struct VectorTraits : public AllocatorTraits
{
static const signature_type g_signature;
VectorTraits()
: AllocatorTraits (g_signature)
{}
};
struct ScalarTraits : public AllocatorTraits
{
static const signature_type g_signature;
ScalarTraits()
: AllocatorTraits (g_signature)
{}
};
const AllocatorTraits::signature_type VectorTraits::g_signature = "new[]()";
const AllocatorTraits::signature_type ScalarTraits::g_signature = "new() ";
} // anonymous namespace
// Allocator
static void default_handler (void)
{
// Multithreading race in 'std::set_new_handler()' call sequence below.
throw std::bad_alloc();
}
static void* allocate (
std::size_t n, AllocatorTraits const & rTraits)
{
n = rTraits.size (n);
for (;;)
{
void * p = rtl_allocateMemory (sal_Size(n));
if (p != 0)
return rTraits.init (p);
std::new_handler d = default_handler, f = std::set_new_handler (d);
if (f != d)
std::set_new_handler (f);
if (f == 0)
throw std::bad_alloc();
(*f)();
}
}
static void* allocate_nothrow (
std::size_t n, AllocatorTraits const & rTraits)
{
try
{
return allocate (n, rTraits);
}
catch (std::bad_alloc const &)
{
return 0;
}
}
static void deallocate (void * p, AllocatorTraits const & rTraits)
{
if (p)
{
rtl_freeMemory (rTraits.fini(p));
}
}
// T * p = new T; delete p;
void* SAL_CALL operator new (std::size_t n) throw (std::bad_alloc)
{
return allocate (n, ScalarTraits());
}
void SAL_CALL operator delete (void * p) throw ()
{
deallocate (p, ScalarTraits());
}
// T * p = new(nothrow) T; delete(nothrow) p;
void* SAL_CALL operator new (std::size_t n, std::nothrow_t const &) throw ()
{
return allocate_nothrow (n, ScalarTraits());
}
void SAL_CALL operator delete (void * p, std::nothrow_t const &) throw ()
{
deallocate (p, ScalarTraits());
}
// T * p = new T[n]; delete[] p;
void* SAL_CALL operator new[] (std::size_t n) throw (std::bad_alloc)
{
return allocate (n, VectorTraits());
}
void SAL_CALL operator delete[] (void * p) throw ()
{
deallocate (p, VectorTraits());
}
// T * p = new(nothrow) T[n]; delete(nothrow)[] p;
void* SAL_CALL operator new[] (std::size_t n, std::nothrow_t const &) throw ()
{
return allocate_nothrow (n, VectorTraits());
}
void SAL_CALL operator delete[] (void * p, std::nothrow_t const &) throw ()
{
deallocate (p, VectorTraits());
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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