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Diffstat (limited to 'src/leveldb/util/arena.cc')
-rw-r--r-- | src/leveldb/util/arena.cc | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/src/leveldb/util/arena.cc b/src/leveldb/util/arena.cc deleted file mode 100644 index 9551d6a3a2..0000000000 --- a/src/leveldb/util/arena.cc +++ /dev/null @@ -1,68 +0,0 @@ -// Copyright (c) 2011 The LevelDB Authors. All rights reserved. -// Use of this source code is governed by a BSD-style license that can be -// found in the LICENSE file. See the AUTHORS file for names of contributors. - -#include "util/arena.h" -#include <assert.h> - -namespace leveldb { - -static const int kBlockSize = 4096; - -Arena::Arena() { - blocks_memory_ = 0; - alloc_ptr_ = NULL; // First allocation will allocate a block - alloc_bytes_remaining_ = 0; -} - -Arena::~Arena() { - for (size_t i = 0; i < blocks_.size(); i++) { - delete[] blocks_[i]; - } -} - -char* Arena::AllocateFallback(size_t bytes) { - if (bytes > kBlockSize / 4) { - // Object is more than a quarter of our block size. Allocate it separately - // to avoid wasting too much space in leftover bytes. - char* result = AllocateNewBlock(bytes); - return result; - } - - // We waste the remaining space in the current block. - alloc_ptr_ = AllocateNewBlock(kBlockSize); - alloc_bytes_remaining_ = kBlockSize; - - char* result = alloc_ptr_; - alloc_ptr_ += bytes; - alloc_bytes_remaining_ -= bytes; - return result; -} - -char* Arena::AllocateAligned(size_t bytes) { - const int align = sizeof(void*); // We'll align to pointer size - assert((align & (align-1)) == 0); // Pointer size should be a power of 2 - size_t current_mod = reinterpret_cast<uintptr_t>(alloc_ptr_) & (align-1); - size_t slop = (current_mod == 0 ? 0 : align - current_mod); - size_t needed = bytes + slop; - char* result; - if (needed <= alloc_bytes_remaining_) { - result = alloc_ptr_ + slop; - alloc_ptr_ += needed; - alloc_bytes_remaining_ -= needed; - } else { - // AllocateFallback always returned aligned memory - result = AllocateFallback(bytes); - } - assert((reinterpret_cast<uintptr_t>(result) & (align-1)) == 0); - return result; -} - -char* Arena::AllocateNewBlock(size_t block_bytes) { - char* result = new char[block_bytes]; - blocks_memory_ += block_bytes; - blocks_.push_back(result); - return result; -} - -} // namespace leveldb |