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/*
* Copyright (C) 2014 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_COMPILER_UTILS_SCOPED_ARENA_ALLOCATOR_H_
#define ART_COMPILER_UTILS_SCOPED_ARENA_ALLOCATOR_H_
#include "base/logging.h"
#include "base/macros.h"
#include "utils/arena_allocator.h"
#include "utils/debug_stack.h"
#include "globals.h"
namespace art {
class ArenaStack;
class ScopedArenaAllocator;
template <typename T>
class ScopedArenaAllocatorAdapter;
// Holds a list of Arenas for use by ScopedArenaAllocator stack.
class ArenaStack : private DebugStackRefCounter {
public:
explicit ArenaStack(ArenaPool* arena_pool);
~ArenaStack();
void Reset();
size_t PeakBytesAllocated() {
return PeakStats()->BytesAllocated();
}
MemStats GetPeakStats() const;
private:
struct Peak;
struct Current;
template <typename Tag> struct TaggedStats : ArenaAllocatorStats { };
struct StatsAndPool : TaggedStats<Peak>, TaggedStats<Current> {
explicit StatsAndPool(ArenaPool* arena_pool) : pool(arena_pool) { }
ArenaPool* const pool;
};
ArenaAllocatorStats* PeakStats() {
return static_cast<TaggedStats<Peak>*>(&stats_and_pool_);
}
ArenaAllocatorStats* CurrentStats() {
return static_cast<TaggedStats<Current>*>(&stats_and_pool_);
}
// Private - access via ScopedArenaAllocator or ScopedArenaAllocatorAdapter.
void* Alloc(size_t bytes, ArenaAllocKind kind) ALWAYS_INLINE {
if (UNLIKELY(running_on_valgrind_)) {
return AllocValgrind(bytes, kind);
}
size_t rounded_bytes = RoundUp(bytes, 8);
uint8_t* ptr = top_ptr_;
if (UNLIKELY(static_cast<size_t>(top_end_ - ptr) < rounded_bytes)) {
ptr = AllocateFromNextArena(rounded_bytes);
}
CurrentStats()->RecordAlloc(bytes, kind);
top_ptr_ = ptr + rounded_bytes;
return ptr;
}
uint8_t* AllocateFromNextArena(size_t rounded_bytes);
void UpdatePeakStatsAndRestore(const ArenaAllocatorStats& restore_stats);
void UpdateBytesAllocated();
void* AllocValgrind(size_t bytes, ArenaAllocKind kind);
StatsAndPool stats_and_pool_;
Arena* bottom_arena_;
Arena* top_arena_;
uint8_t* top_ptr_;
uint8_t* top_end_;
const bool running_on_valgrind_;
friend class ScopedArenaAllocator;
template <typename T>
friend class ScopedArenaAllocatorAdapter;
DISALLOW_COPY_AND_ASSIGN(ArenaStack);
};
class ScopedArenaAllocator
: private DebugStackReference, private DebugStackRefCounter, private ArenaAllocatorStats {
public:
// Create a ScopedArenaAllocator directly on the ArenaStack when the scope of
// the allocator is not exactly a C++ block scope. For example, an optimization
// pass can create the scoped allocator in Start() and destroy it in End().
static ScopedArenaAllocator* Create(ArenaStack* arena_stack) {
void* addr = arena_stack->Alloc(sizeof(ScopedArenaAllocator), kArenaAllocMisc);
ScopedArenaAllocator* allocator = new(addr) ScopedArenaAllocator(arena_stack);
allocator->mark_ptr_ = reinterpret_cast<uint8_t*>(addr);
return allocator;
}
explicit ScopedArenaAllocator(ArenaStack* arena_stack);
~ScopedArenaAllocator();
void Reset();
void* Alloc(size_t bytes, ArenaAllocKind kind = kArenaAllocMisc) ALWAYS_INLINE {
DebugStackReference::CheckTop();
return arena_stack_->Alloc(bytes, kind);
}
template <typename T>
T* AllocArray(size_t length, ArenaAllocKind kind = kArenaAllocMisc) {
return static_cast<T*>(Alloc(length * sizeof(T), kind));
}
// Get adapter for use in STL containers. See scoped_arena_containers.h .
ScopedArenaAllocatorAdapter<void> Adapter(ArenaAllocKind kind = kArenaAllocSTL);
// Allow a delete-expression to destroy but not deallocate allocators created by Create().
static void operator delete(void* ptr) { UNUSED(ptr); }
private:
ArenaStack* const arena_stack_;
Arena* mark_arena_;
uint8_t* mark_ptr_;
uint8_t* mark_end_;
void DoReset();
template <typename T>
friend class ScopedArenaAllocatorAdapter;
DISALLOW_COPY_AND_ASSIGN(ScopedArenaAllocator);
};
} // namespace art
#endif // ART_COMPILER_UTILS_SCOPED_ARENA_ALLOCATOR_H_
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