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/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_SRC_COMPILER_DEX_COMPILER_ARENA_ALLOCATOR_H_
#define ART_SRC_COMPILER_DEX_COMPILER_ARENA_ALLOCATOR_H_
#include <stdint.h>
#include <stddef.h>
#include "compiler_enums.h"
namespace art {
#define ARENA_DEFAULT_BLOCK_SIZE (256 * 1024)
#define ARENA_HIGH_WATER (16 * 1024)
class ArenaAllocator {
public:
// Type of allocation for memory tuning.
enum ArenaAllocKind {
kAllocMisc,
kAllocBB,
kAllocLIR,
kAllocMIR,
kAllocDFInfo,
kAllocGrowableArray,
kAllocGrowableBitMap,
kAllocDalvikToSSAMap,
kAllocDebugInfo,
kAllocSuccessor,
kAllocRegAlloc,
kAllocData,
kAllocPredecessors,
kNumAllocKinds
};
ArenaAllocator(size_t default_size = ARENA_DEFAULT_BLOCK_SIZE);
~ArenaAllocator();
void* NewMem(size_t size, bool zero, ArenaAllocKind kind);
size_t BytesAllocated() {
return malloc_bytes_;
}
void DumpMemStats(std::ostream& os) const;
private:
// Variable-length allocation block.
struct ArenaMemBlock {
size_t block_size;
size_t bytes_allocated;
ArenaMemBlock *next;
char ptr[0];
};
ArenaMemBlock* EmptyArenaBlock();
size_t default_size_; // Smallest size of new allocation block.
size_t block_size_; // Amount of allocatable bytes on a default block.
ArenaMemBlock* arena_head_; // Head of linked list of allocation blocks.
ArenaMemBlock* current_block_; // NOTE: code assumes there's always at least 1 block.
int num_arena_blocks_;
uint32_t malloc_bytes_; // Number of actual bytes malloc'd
uint32_t alloc_stats_[kNumAllocKinds]; // Bytes used by various allocation kinds.
uint32_t lost_bytes_; // Lost memory at end of too-small region
uint32_t num_allocations_;
}; // ArenaAllocator
struct MemStats {
public:
void Dump(std::ostream& os) const {
arena_.DumpMemStats(os);
}
MemStats(const ArenaAllocator &arena) : arena_(arena){};
private:
const ArenaAllocator &arena_;
}; // MemStats
} // namespace art
#endif // ART_SRC_COMPILER_DEX_COMPILER_ARENA_ALLOCATOR_H_
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