64 lines
2.1 KiB
C++
64 lines
2.1 KiB
C++
/*
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* Copyright (c) 2023 by FlashInfer team.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FLASHINFER_ALLOCATOR_H_
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#define FLASHINFER_ALLOCATOR_H_
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#include <memory>
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#include <sstream>
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#include "exception.h"
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namespace flashinfer {
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// create a function that returns T* from base pointer and offset
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template <typename T>
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T* GetPtrFromBaseOffset(void* base_ptr, int64_t offset) {
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return reinterpret_cast<T*>(reinterpret_cast<char*>(base_ptr) + offset);
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}
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struct AlignedAllocator {
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void* base_ptr;
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void* cur_ptr;
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size_t remaining_space;
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AlignedAllocator(void* buf, size_t space) : base_ptr(buf), cur_ptr(buf), remaining_space(space) {}
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template <typename T>
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T* aligned_alloc(size_t size, size_t alignment, std::string name) {
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if (std::align(alignment, size, cur_ptr, remaining_space)) {
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T* result = reinterpret_cast<T*>(cur_ptr);
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cur_ptr = (char*)cur_ptr + size;
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remaining_space -= size;
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return result;
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} else {
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std::ostringstream oss;
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oss << "Buffer overflow when allocating memory for " << name << " with size " << size
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<< " and alignment " << alignment << ", but only " << remaining_space
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<< " bytes available in AlignedAllocator. Increase the workspace buffer size.";
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FLASHINFER_ERROR(oss.str());
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}
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return nullptr;
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}
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size_t aligned_alloc_offset(size_t size, size_t alignment, std::string name) {
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return (char*)aligned_alloc<char>(size, alignment, name) - (char*)base_ptr;
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}
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size_t num_allocated_bytes() { return (char*)cur_ptr - (char*)base_ptr; }
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};
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} // namespace flashinfer
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#endif // FLASHINFER_ALLOCATOR_H_
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