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// Copyright 2011 Google Inc. All Rights Reserved.
#ifndef ART_SRC_HEAP_H_
#define ART_SRC_HEAP_H_
#include <vector>
#include "globals.h"
#include "object_bitmap.h"
#include "thread.h"
namespace art {
class Class;
class Object;
class Space;
class HeapBitmap;
class Heap {
public:
static const size_t kInitialSize = 16 * MB;
static const size_t kMaximumSize = 64 * MB;
typedef void (RootVistor)(Object* root, void* arg);
static bool Init(size_t starting_size, size_t maximum_size);
static void Destroy();
// Allocates and initializes storage for an object instance.
static Object* AllocObject(Class* klass, size_t num_bytes);
// Initiates an explicit garbage collection.
static void CollectGarbage();
// Blocks the caller until the garbage collector becomes idle.
static void WaitForConcurrentGcToComplete();
static Mutex* GetLock() {
return lock_;
}
static const std::vector<Space*>& GetSpaces() {
return spaces_;
}
static HeapBitmap* GetLiveBits() {
return live_bitmap_;
}
static HeapBitmap* GetMarkBits() {
return mark_bitmap_;
}
static size_t GetMaximumSize() {
return maximum_size_;
}
private:
// Allocates uninitialized storage.
static Object* Allocate(size_t num_bytes);
static Object* Allocate(Space* space, size_t num_bytes);
static void RecordAllocation(Space* space, const Object* object);
static void RecordFree(Space* space, const Object* object);
static void CollectGarbageInternal();
static void GrowForUtilization();
static Mutex* lock_;
static std::vector<Space*> spaces_;
static HeapBitmap* mark_bitmap_;
static HeapBitmap* live_bitmap_;
// The startup size of the heap in bytes.
static size_t startup_size_;
// The maximum size of the heap in bytes.
static size_t maximum_size_;
// True while the garbage collector is running.
static bool is_gc_running_;
// Number of bytes allocated. Adjusted after each allocation and
// free.
static size_t num_bytes_allocated_;
// Number of objects allocated. Adjusted after each allocation and
// free.
static size_t num_objects_allocated_;
DISALLOW_IMPLICIT_CONSTRUCTORS(Heap);
};
class HeapLock {
public:
HeapLock(Heap* heap) : lock_(heap->GetLock()) {
lock_->Lock();
}
~HeapLock() {
lock_->Unlock();
}
private:
Mutex* lock_;
DISALLOW_COPY_AND_ASSIGN(HeapLock);
};
} // namespace art
#endif // ART_SRC_HEAP_H_
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