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/* Copyright (C) 2018 Wildfire Games.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* adapters for allocators; provides a minimal subset of the
* STL allocator interface.
*/
#ifndef ALLOCATOR_ADAPTERS
#define ALLOCATOR_ADAPTERS
#include <memory>
#include "lib/sysdep/rtl.h"
#include "lib/sysdep/vm.h"
// NB: STL allocators are parameterized on the object type and indicate
// the number of elements to [de]allocate. however, these adapters are
// only used for allocating storage and receive the number of bytes.
struct Allocator_Heap
{
void* allocate(size_t size)
{
return malloc(size);
}
void deallocate(void* p, size_t UNUSED(size))
{
return free(p);
}
};
template<size_t alignment = allocationAlignment>
struct Allocator_Aligned
{
void* allocate(size_t size)
{
return rtl_AllocateAligned(size, alignment);
}
void deallocate(void* p, size_t UNUSED(size))
{
return rtl_FreeAligned(p);
}
};
template<vm::PageType pageType = vm::kDefault, int prot = PROT_READ|PROT_WRITE>
struct Allocator_VM
{
void* allocate(size_t size)
{
return vm::Allocate(size, pageType, prot);
}
void deallocate(void* p, size_t size)
{
vm::Free(p, size);
}
};
template<size_t commitSize = g_LargePageSize, vm::PageType pageType = vm::kDefault, int prot = PROT_READ|PROT_WRITE>
struct Allocator_AddressSpace
{
void* allocate(size_t size)
{
return vm::ReserveAddressSpace(size, commitSize, pageType, prot);
}
void deallocate(void* p, size_t size)
{
vm::ReleaseAddressSpace(p, size);
}
};
/**
* fully STL-compatible allocator that simply draws upon another Allocator.
* this allows a single allocator to serve multiple STL containers.
*/
template<typename T, class Allocator>
class ProxyAllocator
{
public:
typedef T value_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
template<class U>
struct rebind
{
typedef ProxyAllocator<U, Allocator> other;
};
// (required to be declared by boost::unordered_map, but should never be called)
explicit NOTHROW_DEFINE ProxyAllocator();
explicit NOTHROW_DEFINE ProxyAllocator(Allocator& allocator)
: allocator(&allocator)
{
}
template<typename U, class A>
NOTHROW_DEFINE ProxyAllocator(const ProxyAllocator<U,A>& rhs)
: allocator(rhs.allocator)
{
}
// (required by VC2010 std::vector)
bool operator==(const ProxyAllocator& rhs) const
{
return allocator == rhs.allocator;
}
bool operator!=(const ProxyAllocator& rhs) const
{
return !operator==(rhs);
}
pointer address(reference r)
{
return &r;
}
const_pointer address(const_reference s)
{
return &s;
}
size_type max_size() const throw ()
{
return std::numeric_limits<std::size_t>::max() / sizeof(T);
}
void construct(const pointer ptr, const value_type& t)
{
new(ptr) T(t);
}
void destroy(pointer ptr)
{
ptr->~T();
UNUSED2(ptr); // silence MSVC warnings
}
pointer allocate(size_type n)
{
// safely handle zero-sized allocations (happens with GCC STL - see ticket #909).
if(n == 0)
n = 1;
return (pointer)allocator->allocate(n*sizeof(T));
}
pointer allocate(size_type n, const void* const)
{
return allocate(n);
}
void deallocate(const pointer ptr, const size_type n)
{
return allocator->deallocate(ptr, n*sizeof(T));
}
//private: // otherwise copy ctor cannot access it
Allocator* allocator;
};
#endif // #ifndef ALLOCATOR_ADAPTERS
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