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-rw-r--r--src/leveldb/util/arena.cc68
1 files changed, 0 insertions, 68 deletions
diff --git a/src/leveldb/util/arena.cc b/src/leveldb/util/arena.cc
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index 9551d6a3a2..0000000000
--- a/src/leveldb/util/arena.cc
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@@ -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