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/*
* Copyright 2010-2011 PathScale, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* memory.cc - Contains stub definition of C++ new/delete operators.
*
* These definitions are intended to be used for testing and are weak symbols
* to allow them to be replaced by definitions from a STL implementation.
* These versions simply wrap malloc() and free(), they do not provide a
* C++-specific allocator.
*/
#include <stddef.h>
#include <stdlib.h>
#include "stdexcept.h"
#include "atomic.h"
namespace std
{
struct nothrow_t {};
}
/// The type of the function called when allocation fails.
typedef void (*new_handler)();
/**
* The function to call when allocation fails. By default, there is no
* handler and a bad allocation exception is thrown if an allocation fails.
*/
static new_handler new_handl;
namespace std
{
/**
* Sets a function to be called when there is a failure in new.
*/
__attribute__((weak))
new_handler set_new_handler(new_handler handler) noexcept
{
return ATOMIC_SWAP(&new_handl, handler);
}
__attribute__((weak))
new_handler get_new_handler(void) noexcept
{
return ATOMIC_LOAD(&new_handl);
}
}
#if __cplusplus < 201103L
#define NOEXCEPT noexcept
#define BADALLOC throw(std::bad_alloc)
#else
#define NOEXCEPT noexcept
#define BADALLOC
#endif
namespace
{
/**
* Helper for forwarding from no-throw operators to versions that can
* return nullptr. Catches any exception and converts it into a nullptr
* return.
*/
template<void*(New)(size_t)>
void *noexcept_new(size_t size)
{
#if !defined(_CXXRT_NO_EXCEPTIONS)
try
{
return New(size);
} catch (...)
{
// nothrow operator new should return NULL in case of
// std::bad_alloc exception in new handler
return nullptr;
}
#else
return New(size);
#endif
}
}
__attribute__((weak))
void* operator new(size_t size) BADALLOC
{
if (0 == size)
{
size = 1;
}
void * mem = malloc(size);
while (0 == mem)
{
new_handler h = std::get_new_handler();
if (0 != h)
{
h();
}
else
{
#if !defined(_CXXRT_NO_EXCEPTIONS)
throw std::bad_alloc();
#else
break;
#endif
}
mem = malloc(size);
}
return mem;
}
__attribute__((weak))
void* operator new(size_t size, const std::nothrow_t &) NOEXCEPT
{
return noexcept_new<(::operator new)>(size);
}
__attribute__((weak))
void operator delete(void * ptr) NOEXCEPT
{
free(ptr);
}
__attribute__((weak))
void * operator new[](size_t size) BADALLOC
{
return ::operator new(size);
}
__attribute__((weak))
void * operator new[](size_t size, const std::nothrow_t &) NOEXCEPT
{
return noexcept_new<(::operator new[])>(size);
}
__attribute__((weak))
void operator delete[](void * ptr) NOEXCEPT
{
::operator delete(ptr);
}
// C++14 additional delete operators
#if __cplusplus >= 201402L
__attribute__((weak))
void operator delete(void * ptr, size_t) NOEXCEPT
{
::operator delete(ptr);
}
__attribute__((weak))
void operator delete[](void * ptr, size_t) NOEXCEPT
{
::operator delete(ptr);
}
#endif
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