99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
/*
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Open Asset Import Library (assimp)
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----------------------------------------------------------------------
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Copyright (c) 2006-2024, assimp team
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All rights reserved.
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Redistribution and use of this software in source and binary forms,
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with or without modification, are permitted provided that the
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following conditions are met:
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* Redistributions of source code must retain the above
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copyright notice, this list of conditions and the
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following disclaimer.
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* Redistributions in binary form must reproduce the above
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copyright notice, this list of conditions and the
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following disclaimer in the documentation and/or other
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materials provided with the distribution.
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* Neither the name of the assimp team, nor the names of its
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contributors may be used to endorse or promote products
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derived from this software without specific prior
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written permission of the assimp team.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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----------------------------------------------------------------------
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*/
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/** @file StackAllocator.h
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* @brief A very bare-bone allocator class that is suitable when
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* allocating many small objects, e.g. during parsing.
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* Individual objects are not freed, instead only the whole memory
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* can be deallocated.
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*/
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#ifndef AI_STACK_ALLOCATOR_H_INC
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#define AI_STACK_ALLOCATOR_H_INC
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#include <vector>
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#include <stdint.h>
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#include <stddef.h>
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namespace Assimp {
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/** @brief A very bare-bone allocator class that is suitable when
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* allocating many small objects, e.g. during parsing.
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* Individual objects are not freed, instead only the whole memory
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* can be deallocated.
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*/
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class StackAllocator {
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public:
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/// @brief Constructs the allocator
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StackAllocator();
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/// @brief Destructs the allocator and frees all memory
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~StackAllocator();
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// non copyable
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StackAllocator(const StackAllocator &) = delete;
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StackAllocator &operator=(const StackAllocator &) = delete;
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/// @brief Returns a pointer to byteSize bytes of heap memory that persists
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/// for the lifetime of the allocator (or until FreeAll is called).
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inline void *Allocate(size_t byteSize);
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/// @brief Releases all the memory owned by this allocator.
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// Memory provided through function Allocate is not valid anymore after this function has been called.
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inline void FreeAll();
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private:
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constexpr const static size_t g_maxBytesPerBlock = 64 * 1024 * 1024; // The maximum size (in bytes) of a block
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constexpr const static size_t g_startBytesPerBlock = 16 * 1024; // Size of the first block. Next blocks will double in size until maximum size of g_maxBytesPerBlock
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size_t m_blockAllocationSize = g_startBytesPerBlock; // Block size of the current block
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size_t m_subIndex = g_maxBytesPerBlock; // The current byte offset in the current block
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std::vector<uint8_t *> m_storageBlocks; // A list of blocks
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};
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} // namespace Assimp
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/// @brief Fixes an undefined reference error when linking in certain build environments.
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// May throw warnings about needing stdc++17, but should compile without issues on modern compilers.
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inline const size_t Assimp::StackAllocator::g_maxBytesPerBlock;
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inline const size_t Assimp::StackAllocator::g_startBytesPerBlock;
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#include "StackAllocator.inl"
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#endif // include guard
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