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-rw-r--r--src/leveldb/util/arena.h68
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diff --git a/src/leveldb/util/arena.h b/src/leveldb/util/arena.h
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-// 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.
-
-#ifndef STORAGE_LEVELDB_UTIL_ARENA_H_
-#define STORAGE_LEVELDB_UTIL_ARENA_H_
-
-#include <cstddef>
-#include <vector>
-#include <assert.h>
-#include <stdint.h>
-
-namespace leveldb {
-
-class Arena {
- public:
- Arena();
- ~Arena();
-
- // Return a pointer to a newly allocated memory block of "bytes" bytes.
- char* Allocate(size_t bytes);
-
- // Allocate memory with the normal alignment guarantees provided by malloc
- char* AllocateAligned(size_t bytes);
-
- // Returns an estimate of the total memory usage of data allocated
- // by the arena (including space allocated but not yet used for user
- // allocations).
- size_t MemoryUsage() const {
- return blocks_memory_ + blocks_.capacity() * sizeof(char*);
- }
-
- private:
- char* AllocateFallback(size_t bytes);
- char* AllocateNewBlock(size_t block_bytes);
-
- // Allocation state
- char* alloc_ptr_;
- size_t alloc_bytes_remaining_;
-
- // Array of new[] allocated memory blocks
- std::vector<char*> blocks_;
-
- // Bytes of memory in blocks allocated so far
- size_t blocks_memory_;
-
- // No copying allowed
- Arena(const Arena&);
- void operator=(const Arena&);
-};
-
-inline char* Arena::Allocate(size_t bytes) {
- // The semantics of what to return are a bit messy if we allow
- // 0-byte allocations, so we disallow them here (we don't need
- // them for our internal use).
- assert(bytes > 0);
- if (bytes <= alloc_bytes_remaining_) {
- char* result = alloc_ptr_;
- alloc_ptr_ += bytes;
- alloc_bytes_remaining_ -= bytes;
- return result;
- }
- return AllocateFallback(bytes);
-}
-
-} // namespace leveldb
-
-#endif // STORAGE_LEVELDB_UTIL_ARENA_H_