Revision control
++ // 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
++