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// Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
// Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
// SPDX-FileCopyrightText: Copyright (c) 2008-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
#ifndef PX_ALLOCA_H
#define PX_ALLOCA_H
#include "foundation/PxTempAllocator.h"
#if !PX_DOXYGEN
namespace physx
{
#endif
template <typename T, typename Alloc = PxTempAllocator>
class PxScopedPointer : private Alloc
{
public:
~PxScopedPointer()
{
if(mOwned)
Alloc::deallocate(mPointer);
}
operator T*() const
{
return mPointer;
}
T* mPointer;
bool mOwned;
};
#if !PX_DOXYGEN
} // namespace physx
#endif
// Don't use inline for alloca !!!
#if PX_WINDOWS_FAMILY
#include <malloc.h>
#define PxAlloca(x) _alloca(x)
#elif PX_LINUX
#include <malloc.h>
#define PxAlloca(x) alloca(x)
#elif PX_APPLE_FAMILY
#include <alloca.h>
#define PxAlloca(x) alloca(x)
#elif PX_SWITCH
#include <malloc.h>
#define PxAlloca(x) alloca(x)
#endif
#define PxAllocaAligned(x, alignment) ((size_t(PxAlloca(x + alignment)) + (alignment - 1)) & ~size_t(alignment - 1))
/*! Stack allocation for \c count instances of \c type. Falling back to temp allocator if using more than 4kB. */
#define PX_ALLOCA(var, type, count) \
physx::PxScopedPointer<type> var; \
{ \
const uint32_t size = sizeof(type) * (count); \
var.mOwned = size > 4096; \
if(var.mOwned) \
var.mPointer = reinterpret_cast<type*>(physx::PxTempAllocator().allocate(size, PX_FL)); \
else \
var.mPointer = reinterpret_cast<type*>(PxAlloca(size)); \
}
#endif