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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/assert.h"
#include "platform/atomic.h"
#include "vm/bitfield.h"
#include "vm/globals.h"
namespace dart {
class Class;
class ClassStats;
class ClassTable;
class JSONArray;
class JSONObject;
class JSONStream;
template <typename T>
class MallocGrowableArray;
class ObjectPointerVisitor;
class RawClass;
class ClassAndSize {
ClassAndSize() : class_(NULL), size_(0) {}
explicit ClassAndSize(RawClass* clazz);
ClassAndSize(RawClass* clazz, intptr_t size) : class_(clazz), size_(size) {}
RawClass* get_raw_class() const { return class_; }
intptr_t size() const { return size_; }
RawClass* class_;
intptr_t size_;
friend class ClassTable;
#if defined(ARCH_IS_32_BIT)
const int kSizeOfClassPairLog2 = 3;
const int kSizeOfClassPairLog2 = 4;
COMPILE_ASSERT((1 << kSizeOfClassPairLog2) == sizeof(ClassAndSize));
#ifndef PRODUCT
template <typename T>
class AllocStats {
T new_count;
T new_size;
T new_external_size;
T old_count;
T old_size;
T old_external_size;
void ResetNew() {
new_count = 0;
new_size = 0;
new_external_size = 0;
void AddNew(T size) {
AtomicOperations::IncrementBy(&new_count, 1);
AtomicOperations::IncrementBy(&new_size, size);
void AddNewExternal(T size) {
AtomicOperations::IncrementBy(&new_external_size, size);
void ResetOld() {
old_count = 0;
old_size = 0;
old_external_size = 0;
void AddOld(T size, T count = 1) {
AtomicOperations::IncrementBy(&old_count, count);
AtomicOperations::IncrementBy(&old_size, size);
void AddOldExternal(T size) {
AtomicOperations::IncrementBy(&old_external_size, size);
void Reset() {
// For classes with fixed instance size we do not emit code to update
// the size statistics. Update them by calling this method.
void UpdateSize(intptr_t instance_size) {
ASSERT(instance_size > 0);
old_size = old_count * instance_size;
new_size = new_count * instance_size;
void Verify() {
ASSERT(new_count >= 0);
ASSERT(new_size >= 0);
ASSERT(new_external_size >= 0);
ASSERT(old_count >= 0);
ASSERT(old_size >= 0);
ASSERT(old_external_size >= 0);
class ClassHeapStats {
// Snapshot before GC.
AllocStats<intptr_t> pre_gc;
// Live after GC.
AllocStats<intptr_t> post_gc;
// Allocations since the last GC.
AllocStats<intptr_t> recent;
// Accumulated (across GC) allocations .
AllocStats<int64_t> accumulated;
// Snapshot of recent at the time of the last reset.
AllocStats<intptr_t> last_reset;
// Promoted from new to old by last new GC.
intptr_t promoted_count;
intptr_t promoted_size;
static intptr_t allocated_since_gc_new_space_offset() {
return OFFSET_OF(ClassHeapStats, recent) +
OFFSET_OF(AllocStats<intptr_t>, new_count);
static intptr_t allocated_since_gc_old_space_offset() {
return OFFSET_OF(ClassHeapStats, recent) +
OFFSET_OF(AllocStats<intptr_t>, old_count);
static intptr_t allocated_size_since_gc_new_space_offset() {
return OFFSET_OF(ClassHeapStats, recent) +
OFFSET_OF(AllocStats<intptr_t>, new_size);
static intptr_t allocated_size_since_gc_old_space_offset() {
return OFFSET_OF(ClassHeapStats, recent) +
OFFSET_OF(AllocStats<intptr_t>, old_size);
static intptr_t state_offset() { return OFFSET_OF(ClassHeapStats, state_); }
static intptr_t TraceAllocationMask() { return (1 << kTraceAllocationBit); }
void Initialize();
void ResetAtNewGC();
void ResetAtOldGC();
void ResetAccumulator();
void UpdatePromotedAfterNewGC();
void UpdateSize(intptr_t instance_size);
#ifndef PRODUCT
void PrintToJSONObject(const Class& cls, JSONObject* obj) const;
void Verify();
bool trace_allocation() const { return TraceAllocationBit::decode(state_); }
void set_trace_allocation(bool trace_allocation) {
state_ = TraceAllocationBit::update(trace_allocation, state_);
enum StateBits {
kTraceAllocationBit = 0,
class TraceAllocationBit
: public BitField<intptr_t, bool, kTraceAllocationBit, 1> {};
// Recent old at start of last new GC (used to compute promoted_*).
intptr_t old_pre_new_gc_count_;
intptr_t old_pre_new_gc_size_;
intptr_t state_;
intptr_t align_; // Make SIMARM and ARM agree on the size of ClassHeapStats.
#endif // !PRODUCT
class ClassTable {
// Creates a shallow copy of the original class table for some read-only
// access, without support for stats data.
explicit ClassTable(ClassTable* original);
// Thread-safe.
RawClass* At(intptr_t index) const {
return table_[index].class_;
intptr_t SizeAt(intptr_t index) const {
return table_[index].size_;
ClassAndSize PairAt(intptr_t index) const {
return table_[index];
void SetAt(intptr_t index, RawClass* raw_cls);
bool IsValidIndex(intptr_t index) const {
return (index > 0) && (index < top_);
bool HasValidClassAt(intptr_t index) const {
return table_[index].class_ != NULL;
intptr_t NumCids() const { return top_; }
// Used to drop recently added classes.
void SetNumCids(intptr_t num_cids) {
ASSERT(num_cids <= top_);
top_ = num_cids;
void Register(const Class& cls);
void AllocateIndex(intptr_t index);
#if defined(DEBUG)
void Unregister(intptr_t index);
void Remap(intptr_t* old_to_new_cids);
void VisitObjectPointers(ObjectPointerVisitor* visitor);
// If a snapshot reader has populated the class table then the
// sizes in the class table are not correct. Iterates through the
// table, updating the sizes.
void CopySizesFromClassObjects();
void Validate();
void Print();
// Used by the generated code.
static intptr_t table_offset() { return OFFSET_OF(ClassTable, table_); }
// Used by the generated code.
static intptr_t ClassOffsetFor(intptr_t cid);
#ifndef PRODUCT
// Called whenever a class is allocated in the runtime.
void UpdateAllocatedNew(intptr_t cid, intptr_t size);
void UpdateAllocatedOld(intptr_t cid, intptr_t size);
void UpdateAllocatedExternalNew(intptr_t cid, intptr_t size);
void UpdateAllocatedExternalOld(intptr_t cid, intptr_t size);
// Called whenever a old GC occurs.
void ResetCountersOld();
// Called whenever a new GC occurs.
void ResetCountersNew();
// Called immediately after a new GC.
void UpdatePromoted();
// Used by the generated code.
ClassHeapStats** TableAddressFor(intptr_t cid);
static intptr_t TableOffsetFor(intptr_t cid);
// Used by the generated code.
static intptr_t CounterOffsetFor(intptr_t cid, bool is_new_space);
// Used by the generated code.
static intptr_t StateOffsetFor(intptr_t cid);
// Used by the generated code.
static intptr_t SizeOffsetFor(intptr_t cid, bool is_new_space);
ClassHeapStats* StatsWithUpdatedSize(intptr_t cid);
void AllocationProfilePrintJSON(JSONStream* stream);
void ResetAllocationAccumulators();
void PrintToJSONObject(JSONObject* object);
#endif // !PRODUCT
void AddOldTable(ClassAndSize* old_table);
// Deallocates table copies. Do not call during concurrent access to table.
void FreeOldTables();
void SetTraceAllocationFor(intptr_t cid, bool trace);
bool TraceAllocationFor(intptr_t cid);
friend class GCMarker;
friend class MarkingWeakVisitor;
friend class ScavengerVisitor;
friend class ScavengerWeakVisitor;
friend class ClassHeapStatsTestHelper;
static const int initial_capacity_ = 512;
static const int capacity_increment_ = 256;
static bool ShouldUpdateSizeForClassId(intptr_t cid);
intptr_t top_;
intptr_t capacity_;
// Copy-on-write is used for table_, with old copies stored in old_tables_.
ClassAndSize* table_;
MallocGrowableArray<ClassAndSize*>* old_tables_;
#ifndef PRODUCT
ClassHeapStats* class_heap_stats_table_;
ClassHeapStats* predefined_class_heap_stats_table_;
// May not have updated size for variable size classes.
ClassHeapStats* PreliminaryStatsAt(intptr_t cid);
void UpdateLiveOld(intptr_t cid, intptr_t size, intptr_t count = 1);
void UpdateLiveNew(intptr_t cid, intptr_t size);
void UpdateLiveOldExternal(intptr_t cid, intptr_t size);
void UpdateLiveNewExternal(intptr_t cid, intptr_t size);
#endif // !PRODUCT
} // namespace dart