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* Copyright (C) 2008 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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#ifndef ART_SRC_HEAP_H_
#define ART_SRC_HEAP_H_
#include <vector>
#include "globals.h"
#include "object_bitmap.h"
#include "offsets.h"
namespace art {
class Class;
class Mutex;
class Object;
class Space;
class HeapBitmap;
class Heap {
static const size_t kInitialSize = 4 * MB;
static const size_t kMaximumSize = 16 * MB;
typedef void (RootVisitor)(const Object* root, void* arg);
typedef bool (IsMarkedTester)(const Object* object, void* arg);
// Create a heap with the requested sizes. The possible empty
// image_file_names names specify Spaces to load based on
// ImageWriter output.
static void Init(size_t starting_size, size_t maximum_size,
const std::vector<std::string>& image_file_names);
static void Destroy();
// Allocates and initializes storage for an object instance.
static Object* AllocObject(Class* klass, size_t num_bytes);
// Check sanity of given reference. Requires the heap lock.
static void VerifyObject(const Object *obj);
static void VerifyObject(const Object *obj) {}
// Check sanity of all live references. Requires the heap lock.
static void VerifyHeap();
// A weaker test than VerifyObject that doesn't require the heap lock,
// and doesn't abort on error, allowing the caller to report more
// meaningful diagnostics.
static bool IsHeapAddress(const Object* obj);
// Initiates an explicit garbage collection.
static void CollectGarbage();
// Implements java.lang.Runtime.maxMemory.
static int64_t GetMaxMemory();
// Implements java.lang.Runtime.totalMemory.
static int64_t GetTotalMemory();
// Implements java.lang.Runtime.freeMemory.
static int64_t GetFreeMemory();
// Implements VMDebug.countInstancesOfClass.
static int64_t CountInstances(Class* c, bool count_assignable);
// Implements dalvik.system.VMRuntime.clearGrowthLimit.
static void ClearGrowthLimit() {
// Implements dalvik.system.VMRuntime.getTargetHeapUtilization.
static float GetTargetHeapUtilization() {
return target_utilization_;
// Implements dalvik.system.VMRuntime.setTargetHeapUtilization.
static void SetTargetHeapUtilization(float target) {
target_utilization_ = target;
// Sets the maximum number of bytes that the heap is allowed to allocate
// from the system. Clamps to the appropriate maximum value.
static void SetIdealFootprint(size_t max_allowed_footprint);
// Blocks the caller until the garbage collector becomes idle.
static void WaitForConcurrentGcToComplete();
static void Lock();
static void Unlock();
static const std::vector<Space*>& GetSpaces() {
return spaces_;
static HeapBitmap* GetLiveBits() {
return live_bitmap_;
static HeapBitmap* GetMarkBits() {
return mark_bitmap_;
static void SetWellKnownClasses(Class* java_lang_ref_FinalizerReference,
Class* java_lang_ref_ReferenceQueue);
static void SetReferenceOffsets(MemberOffset reference_referent_offset,
MemberOffset reference_queue_offset,
MemberOffset reference_queueNext_offset,
MemberOffset reference_pendingNext_offset,
MemberOffset finalizer_reference_zombie_offset);
static Object* GetReferenceReferent(Object* reference);
static void ClearReferenceReferent(Object* reference);
// Returns true if the reference object has not yet been enqueued.
static bool IsEnqueuable(const Object* ref);
static void EnqueueReference(Object* ref, Object** list);
static void EnqueuePendingReference(Object* ref, Object** list);
static Object* DequeuePendingReference(Object** list);
static MemberOffset GetReferencePendingNextOffset() {
DCHECK_NE(reference_pendingNext_offset_.Uint32Value(), 0U);
return reference_pendingNext_offset_;
static MemberOffset GetFinalizerReferenceZombieOffset() {
DCHECK_NE(finalizer_reference_zombie_offset_.Uint32Value(), 0U);
return finalizer_reference_zombie_offset_;
static void EnableObjectValidation() {
verify_objects_ = true;
static void DisableObjectValidation() {
verify_objects_ = false;
// Callers must hold the heap lock.
static void RecordFreeLocked(Space* space, const Object* object);
// Must be called if a field of an Object in the heap changes, and before any GC safe-point.
// The call is not needed if NULL is stored in the field.
static void WriteBarrier(const Object* object) {
// TODO: we need card marking for a concurrent collector.
static void AddFinalizerReference(Object* object);
// Allocates uninitialized storage.
static Object* AllocateLocked(size_t num_bytes);
static Object* AllocateLocked(Space* space, size_t num_bytes);
// Pushes a list of cleared references out to the managed heap.
static void EnqueueClearedReferences(Object** cleared_references);
static void RecordAllocationLocked(Space* space, const Object* object);
static void RecordImageAllocations(Space* space);
static void CollectGarbageInternal();
static void GrowForUtilization();
static void VerifyObjectLocked(const Object *obj);
static void VerificationCallback(Object* obj, void* arg);
static Mutex* lock_;
static std::vector<Space*> spaces_;
// default Space for allocations
static Space* alloc_space_;
static HeapBitmap* mark_bitmap_;
static HeapBitmap* live_bitmap_;
// 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_;
static Class* java_lang_ref_FinalizerReference_;
static Class* java_lang_ref_ReferenceQueue_;
// offset of java.lang.ref.Reference.referent
static MemberOffset reference_referent_offset_;
// offset of java.lang.ref.Reference.queue
static MemberOffset reference_queue_offset_;
// offset of java.lang.ref.Reference.queueNext
static MemberOffset reference_queueNext_offset_;
// offset of java.lang.ref.Reference.pendingNext
static MemberOffset reference_pendingNext_offset_;
// offset of java.lang.ref.FinalizerReference.zombie
static MemberOffset finalizer_reference_zombie_offset_;
// Target ideal heap utilization ratio
static float target_utilization_;
static bool verify_objects_;
} // namespace art
#endif // ART_SRC_HEAP_H_