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/*
* Copyright (C) 2011 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_MARK_STACK_H_
#define ART_SRC_MARK_STACK_H_
#include <string>
#include "atomic.h"
#include "UniquePtr.h"
#include "logging.h"
#include "macros.h"
#include "mem_map.h"
namespace art {
class Object;
class MarkStack {
public:
// Length is in bytes.
static MarkStack* Create(const std::string& name, size_t length);
~MarkStack();
void Push(const Object* obj) {
DCHECK(obj != NULL);
DCHECK_NE(ptr_, limit_);
*ptr_ = obj;
++ptr_;
}
// Beware: Atomic pushes and pops don't mix well.
void AtomicPush(const Object* obj) {
DCHECK(obj != NULL);
DCHECK_NE(ptr_, limit_);
DCHECK_EQ(sizeof(ptr_), sizeof(int32_t));
int32_t* ptr = reinterpret_cast<int32_t*>(reinterpret_cast<size_t>(&ptr_));
*reinterpret_cast<const Object**>(android_atomic_add(sizeof(*ptr_), ptr)) = obj;
}
const Object* Pop() {
DCHECK_NE(ptr_, begin_);
--ptr_;
DCHECK(*ptr_ != NULL);
return *ptr_;
}
bool IsEmpty() const {
return ptr_ == begin_;
}
size_t Size() const {
DCHECK_GE(ptr_, begin_);
return ptr_ - begin_;
}
const Object* Get(size_t index) const {
DCHECK_LT(index, Size());
return begin_[index];
}
Object** Begin() {
return const_cast<Object**>(begin_);
}
void Reset();
private:
MarkStack(const std::string& name) : name_(name), begin_(NULL), limit_(NULL), ptr_(NULL) {}
void Init(size_t length);
// Name of the mark stack.
const std::string& name_;
// Memory mapping of the mark stack.
UniquePtr<MemMap> mem_map_;
// Base of the mark stack.
const Object* const* begin_;
// Exclusive limit of the mark stack.
const Object* const* limit_;
// Pointer to the top of the mark stack.
const Object** ptr_;
DISALLOW_COPY_AND_ASSIGN(MarkStack);
};
} // namespace art
#endif // ART_SRC_MARK_STACK_H_
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