[heap] Rework and improve object stats tracing

src/heap/object-stats.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/object-stats.h"
 
 #include "src/counters.h"
 #include "src/heap/heap-inl.h"
 #include "src/isolate.h"
 #include "src/utils.h"
 
 namespace v8 {
 namespace internal {
 
 static base::LazyMutex object_stats_mutex = LAZY_MUTEX_INITIALIZER;
 
 
 void ObjectStats::ClearObjectStats(bool clear_last_time_stats) {
   memset(object_counts_, 0, sizeof(object_counts_));
   memset(object_sizes_, 0, sizeof(object_sizes_));
+  memset(over_allocated_, 0, sizeof(over_allocated_));
+  memset(size_histogram_, 0, sizeof(size_histogram_));
+  memset(over_allocated_histogram_, 0, sizeof(over_allocated_histogram_));
   if (clear_last_time_stats) {
     memset(object_counts_last_time_, 0, sizeof(object_counts_last_time_));
     memset(object_sizes_last_time_, 0, sizeof(object_sizes_last_time_));
   }
 }
 
+void ObjectStats::PrintJSON(const char* key) {
+  double time = isolate()->time_millis_since_init();
+  int gc_count = heap()->gc_count();
 
-void ObjectStats::TraceObjectStat(const char* name, int count, int size,
-                                  double time) {
-  int ms_count = heap()->ms_count();
-  PrintIsolate(isolate(),
-               "heap:%p, time:%f, gc:%d, type:%s, count:%d, size:%d\n",
-               static_cast<void*>(heap()), time, ms_count, name, count, size);
+#define PRINT_KEY_AND_ID()                                     \
+  PrintF("\"isolate\": \"%p\", \"id\": %d, \"key\": \"%s\", ", \
+         reinterpret_cast<void*>(isolate()), gc_count, key);
+
+  // gc_descriptor
+  PrintF("{ ");
+  PRINT_KEY_AND_ID();
+  PrintF("\"type\": \"gc_descriptor\", \"time\": %f }\n", time);
+  // bucket_sizes
+  PrintF("{ ");
+  PRINT_KEY_AND_ID();
+  PrintF("\"type\": \"bucket_sizes\", \"sizes\": [ ");
+  for (int i = 0; i < kNumberOfBuckets; i++) {
+    PrintF("%d", 1 << (kFirstBucketShift + i));
+    if (i != (kNumberOfBuckets - 1)) PrintF(", ");
+  }
+  PrintF(" ] }\n");
+// instance_type_data
+#define PRINT_INSTANCE_TYPE_DATA(name, index)                  \
+  PrintF("{ ");                                                \
+  PRINT_KEY_AND_ID();                                          \
+  PrintF("\"type\": \"instance_type_data\", ");                \
+  PrintF("\"instance_type\": %d, ", index);                    \
+  PrintF("\"instance_type_name\": \"%s\", ", name);            \
+  PrintF("\"overall\": %zu, ", object_sizes_[index]);          \
+  PrintF("\"count\": %zu, ", object_counts_[index]);           \
+  PrintF("\"over_allocated\": %zu, ", over_allocated_[index]); \
+  PrintF("\"histogram\": [");                                  \
+  for (int j = 0; j < kNumberOfBuckets; j++) {                 \
+    PrintF("%zu", size_histogram_[index][j]);                  \
+    if (j != (kNumberOfBuckets - 1)) PrintF(", ");             \
+  }                                                            \
+  PrintF(" ],");                                               \
+  PrintF("\"over_allocated_histogram\": [");                   \
+  for (int j = 0; j < kNumberOfBuckets; j++) {                 \
+    PrintF("%zu", over_allocated_histogram_[index][j]);        \
+    if (j != (kNumberOfBuckets - 1)) PrintF(", ");             \
+  }                                                            \
+  PrintF(" ]");                                                \
+  PrintF(" }\n");
+
+#define INSTANCE_TYPE_WRAPPER(name) PRINT_INSTANCE_TYPE_DATA(#name, name)
+#define CODE_KIND_WRAPPER(name)            \
+  PRINT_INSTANCE_TYPE_DATA("*CODE_" #name, \
+                           FIRST_CODE_KIND_SUB_TYPE + Code::name)
+#define FIXED_ARRAY_SUB_INSTANCE_TYPE_WRAPPER(name) \
+  PRINT_INSTANCE_TYPE_DATA("*FIXED_ARRAY_" #name,   \
+                           FIRST_FIXED_ARRAY_SUB_TYPE + name)
+#define CODE_AGE_WRAPPER(name) \
+  PRINT_INSTANCE_TYPE_DATA(    \
+      "*CODE_AGE_" #name,      \
+      FIRST_CODE_AGE_SUB_TYPE + Code::k##name##CodeAge - Code::kFirstCodeAge)
+
+  INSTANCE_TYPE_LIST(INSTANCE_TYPE_WRAPPER)
+  CODE_KIND_LIST(CODE_KIND_WRAPPER)
+  FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(FIXED_ARRAY_SUB_INSTANCE_TYPE_WRAPPER)
+  CODE_AGE_LIST_COMPLETE(CODE_AGE_WRAPPER)
+
+#undef INSTANCE_TYPE_WRAPPER
+#undef CODE_KIND_WRAPPER
+#undef FIXED_ARRAY_SUB_INSTANCE_TYPE_WRAPPER
+#undef CODE_AGE_WRAPPER
+#undef PRINT_INSTANCE_TYPE_DATA
 }
 
-
-void ObjectStats::TraceObjectStats() {
-  base::LockGuard<base::Mutex> lock_guard(object_stats_mutex.Pointer());
-  int index;
-  int count;
-  int size;
-  int total_size = 0;
-  double time = isolate()->time_millis_since_init();
-#define TRACE_OBJECT_COUNT(name)                     \
-  count = static_cast<int>(object_counts_[name]);    \
-  size = static_cast<int>(object_sizes_[name]) / KB; \
-  total_size += size;                                \
-  TraceObjectStat(#name, count, size, time);
-  INSTANCE_TYPE_LIST(TRACE_OBJECT_COUNT)
-#undef TRACE_OBJECT_COUNT
-#define TRACE_OBJECT_COUNT(name)                      \
-  index = FIRST_CODE_KIND_SUB_TYPE + Code::name;      \
-  count = static_cast<int>(object_counts_[index]);    \
-  size = static_cast<int>(object_sizes_[index]) / KB; \
-  TraceObjectStat("*CODE_" #name, count, size, time);
-  CODE_KIND_LIST(TRACE_OBJECT_COUNT)
-#undef TRACE_OBJECT_COUNT
-#define TRACE_OBJECT_COUNT(name)                      \
-  index = FIRST_FIXED_ARRAY_SUB_TYPE + name;          \
-  count = static_cast<int>(object_counts_[index]);    \
-  size = static_cast<int>(object_sizes_[index]) / KB; \
-  TraceObjectStat("*FIXED_ARRAY_" #name, count, size, time);
-  FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(TRACE_OBJECT_COUNT)
-#undef TRACE_OBJECT_COUNT
-#define TRACE_OBJECT_COUNT(name)                                              \
-  index =                                                                     \
-      FIRST_CODE_AGE_SUB_TYPE + Code::k##name##CodeAge - Code::kFirstCodeAge; \
-  count = static_cast<int>(object_counts_[index]);                            \
-  size = static_cast<int>(object_sizes_[index]) / KB;                         \
-  TraceObjectStat("*CODE_AGE_" #name, count, size, time);
-  CODE_AGE_LIST_COMPLETE(TRACE_OBJECT_COUNT)
-#undef TRACE_OBJECT_COUNT
-}
-
-
 void ObjectStats::CheckpointObjectStats() {
   base::LockGuard<base::Mutex> lock_guard(object_stats_mutex.Pointer());
   Counters* counters = isolate()->counters();
 #define ADJUST_LAST_TIME_OBJECT_COUNT(name)              \
   counters->count_of_##name()->Increment(                \
       static_cast<int>(object_counts_[name]));           \
   counters->count_of_##name()->Decrement(                \
       static_cast<int>(object_counts_last_time_[name])); \
   counters->size_of_##name()->Increment(                 \
       static_cast<int>(object_sizes_[name]));            \
@@ skipping 41 matching lines @@
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   MemCopy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   MemCopy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 
 Isolate* ObjectStats::isolate() { return heap()->isolate(); }
 
-void ObjectStatsCollector::CountFixedArray(
-    FixedArrayBase* fixed_array, FixedArraySubInstanceType fast_type,
-    FixedArraySubInstanceType dictionary_type) {
-  Heap* heap = fixed_array->map()->GetHeap();
-  if (fixed_array->map() != heap->fixed_cow_array_map() &&
-      fixed_array->map() != heap->fixed_double_array_map() &&
-      fixed_array != heap->empty_fixed_array()) {
-    if (fixed_array->IsDictionary()) {
-      heap->object_stats_->RecordFixedArraySubTypeStats(dictionary_type,
-                                                        fixed_array->Size());
+void ObjectStatsCollector::CollectStatistics(ObjectStats* stats,
+                                             HeapObject* obj) {
+  Map* map = obj->map();
+  Heap* heap = obj->GetHeap();
+
+  // Record for the InstanceType.
+  int object_size = obj->Size();
+  stats->RecordObjectStats(map->instance_type(), object_size);
+
+  // Record specific sub types where possible.
+  if (obj->IsMap()) {
+    RecordMapDetails(stats, heap, obj);
+  }
+  if (obj->IsCode()) {
+    RecordCodeDetails(stats, heap, obj);
+  }
+  if (obj->IsSharedFunctionInfo()) {
+    RecordSharedFunctionInfoDetails(stats, heap, obj);
+  }
+  if (obj->IsFixedArray()) {
+    RecordFixedArrayDetails(stats, heap, obj);
+  }
+  if (obj->IsJSObject()) {
+    RecordJSObjectDetails(stats, heap, JSObject::cast(obj));
+  }
+  if (obj->IsJSWeakCollection()) {
+    RecordJSWeakCollectionDetails(stats, heap, JSWeakCollection::cast(obj));
+  }
+}
+
+static bool CanRecordFixedArray(Heap* heap, FixedArrayBase* array) {
+  return array->map() != heap->fixed_cow_array_map() &&
+         array->map() != heap->fixed_double_array_map() &&
+         array != heap->empty_fixed_array();
+}
+
+void ObjectStatsCollector::RecordJSObjectDetails(ObjectStats* stats, Heap* heap,
+                                                 JSObject* object) {
+  DCHECK(object->IsJSObject());
+
+  size_t overhead = 0;
+  FixedArrayBase* elements = object->elements();
+  if (CanRecordFixedArray(heap, elements)) {
+    if (elements->IsDictionary()) {
+      SeededNumberDictionary* dict = object->element_dictionary();
+      int used = dict->NumberOfElements() * SeededNumberDictionary::kEntrySize;
+      CHECK_GE(elements->Size(), used);
+      overhead = elements->Size() - used;
+      stats->RecordFixedArraySubTypeStats(DICTIONARY_ELEMENTS_SUB_TYPE,
+                                          elements->Size(), overhead);
     } else {
-      heap->object_stats_->RecordFixedArraySubTypeStats(fast_type,
-                                                        fixed_array->Size());
+      if (IsFastHoleyElementsKind(object->GetElementsKind())) {
+        int used = object->GetFastElementsUsage() * kPointerSize;
+        if (object->GetElementsKind() == FAST_HOLEY_DOUBLE_ELEMENTS) used *= 2;
+        CHECK_GE(elements->Size(), used);
+        overhead = elements->Size() - used;
+      }
+      stats->RecordFixedArraySubTypeStats(FAST_ELEMENTS_SUB_TYPE,
+                                          elements->Size(), overhead);
+    }
+  }
+
+  overhead = 0;
+  FixedArrayBase* properties = object->properties();
+  if (CanRecordFixedArray(heap, properties)) {
+    if (properties->IsDictionary()) {
+      NameDictionary* dict = object->property_dictionary();
+      int used = dict->NumberOfElements() * NameDictionary::kEntrySize;
+      CHECK_GE(properties->Size(), used);
+      overhead = properties->Size() - used;
+      stats->RecordFixedArraySubTypeStats(DICTIONARY_PROPERTIES_SUB_TYPE,
+                                          properties->Size(), overhead);
+    } else {
+      stats->RecordFixedArraySubTypeStats(FAST_PROPERTIES_SUB_TYPE,
+                                          properties->Size(), overhead);
     }
   }
 }
 
-void ObjectStatsCollector::CollectStatistics(StaticVisitorBase::VisitorId id,
-                                             Map* map, HeapObject* obj) {
-  // Record any type specific statistics here.
-  switch (id) {
-    case StaticVisitorBase::kVisitMap:
-      RecordMapStats(map, obj);
-      break;
-    case StaticVisitorBase::kVisitCode:
-      RecordCodeStats(map, obj);
-      break;
-    case StaticVisitorBase::kVisitSharedFunctionInfo:
-      RecordSharedFunctionInfoStats(map, obj);
-      break;
-    case StaticVisitorBase::kVisitFixedArray:
-      RecordFixedArrayStats(map, obj);
-      break;
-    default:
-      break;
-  }
-
-  Heap* heap = map->GetHeap();
-  int object_size = obj->Size();
-  heap->object_stats_->RecordObjectStats(map->instance_type(), object_size);
-}
-
-void ObjectStatsCollector::CollectFixedArrayStatistics(HeapObject* obj) {
-  if (obj->IsJSObject()) {
-    JSObject* object = JSObject::cast(obj);
-    CountFixedArray(object->elements(), DICTIONARY_ELEMENTS_SUB_TYPE,

[Michael Lippautz, 2016/07/13 10:10:00]

This looked wrong because we pass DICTIONARY_* as fast_type and FAST_ELEMENTS_*
as dictionary type. I wonder if we see this accounting somewhere (Should be
reflected by syncing instance counters).

-                    FAST_ELEMENTS_SUB_TYPE);
-    CountFixedArray(object->properties(), DICTIONARY_PROPERTIES_SUB_TYPE,
-                    FAST_PROPERTIES_SUB_TYPE);
+void ObjectStatsCollector::RecordJSWeakCollectionDetails(
+    ObjectStats* stats, Heap* heap, JSWeakCollection* obj) {
+  if (obj->table()->IsHashTable()) {
+    ObjectHashTable* table = ObjectHashTable::cast(obj->table());
+    int used = table->NumberOfElements() * ObjectHashTable::kEntrySize;
+    size_t overhead = table->Size() - used;
+    stats->RecordFixedArraySubTypeStats(WEAK_COLLECTION_SUB_TYPE, table->Size(),
+                                        overhead);
   }
 }
 
-void ObjectStatsCollector::RecordMapStats(Map* map, HeapObject* obj) {
-  Heap* heap = map->GetHeap();
+void ObjectStatsCollector::RecordMapDetails(ObjectStats* stats, Heap* heap,
+                                            HeapObject* obj) {
   Map* map_obj = Map::cast(obj);
-  DCHECK(map->instance_type() == MAP_TYPE);
+  DCHECK(obj->map()->instance_type() == MAP_TYPE);
   DescriptorArray* array = map_obj->instance_descriptors();
   if (map_obj->owns_descriptors() && array != heap->empty_descriptor_array()) {
     int fixed_array_size = array->Size();
-    heap->object_stats_->RecordFixedArraySubTypeStats(DESCRIPTOR_ARRAY_SUB_TYPE,
-                                                      fixed_array_size);
+    stats->RecordFixedArraySubTypeStats(DESCRIPTOR_ARRAY_SUB_TYPE,
+                                        fixed_array_size, 0);
+  }
+  if (array->HasEnumCache()) {
+    stats->RecordFixedArraySubTypeStats(ENUM_CACHE_SUB_TYPE,
+                                        array->GetEnumCache()->Size(), 0);
+  }
+  if (array->HasEnumIndicesCache()) {
+    stats->RecordFixedArraySubTypeStats(
+        ENUM_INDICES_CACHE_SUB_TYPE, array->GetEnumIndicesCache()->Size(), 0);
   }
   if (map_obj->has_code_cache()) {
     FixedArray* cache = map_obj->code_cache();
-    heap->object_stats_->RecordFixedArraySubTypeStats(MAP_CODE_CACHE_SUB_TYPE,
-                                                      cache->Size());
+    stats->RecordFixedArraySubTypeStats(MAP_CODE_CACHE_SUB_TYPE, cache->Size(),
+                                        0);
   }
 }
 
-void ObjectStatsCollector::RecordCodeStats(Map* map, HeapObject* obj) {
-  Heap* heap = map->GetHeap();
+void ObjectStatsCollector::RecordCodeDetails(ObjectStats* stats, Heap* heap,
+                                             HeapObject* obj) {
   int object_size = obj->Size();
-  DCHECK(map->instance_type() == CODE_TYPE);
+  DCHECK(obj->map()->instance_type() == CODE_TYPE);
   Code* code_obj = Code::cast(obj);
-  heap->object_stats_->RecordCodeSubTypeStats(code_obj->kind(),
-                                              code_obj->GetAge(), object_size);
-}
-
-void ObjectStatsCollector::RecordSharedFunctionInfoStats(Map* map,
-                                                         HeapObject* obj) {
-  Heap* heap = map->GetHeap();
-  SharedFunctionInfo* sfi = SharedFunctionInfo::cast(obj);
-  if (sfi->scope_info() != heap->empty_fixed_array()) {
-    heap->object_stats_->RecordFixedArraySubTypeStats(
-        SCOPE_INFO_SUB_TYPE, FixedArray::cast(sfi->scope_info())->Size());
+  stats->RecordCodeSubTypeStats(code_obj->kind(), code_obj->GetAge(),
+                                object_size);
+  Code* code = Code::cast(obj);
+  if (code->deoptimization_data() != heap->empty_fixed_array()) {
+    stats->RecordFixedArraySubTypeStats(DEOPTIMIZATION_DATA_TYPE,
+                                        code->deoptimization_data()->Size(), 0);
+  }
+  FixedArrayBase* reloc_info =
+      reinterpret_cast<FixedArrayBase*>(code->unchecked_relocation_info());
+  if (reloc_info != heap->empty_fixed_array()) {
+    stats->RecordFixedArraySubTypeStats(RELOC_INFO_SUB_TYPE,
+                                        code->relocation_info()->Size(), 0);
+  }
+  FixedArrayBase* source_pos_table =
+      reinterpret_cast<FixedArrayBase*>(code->source_position_table());
+  if (source_pos_table != heap->empty_fixed_array()) {
+    stats->RecordFixedArraySubTypeStats(SOURCE_POS_SUB_TYPE,
+                                        source_pos_table->Size(), 0);
   }
 }
 
-void ObjectStatsCollector::RecordFixedArrayStats(Map* map, HeapObject* obj) {
-  Heap* heap = map->GetHeap();
-  FixedArray* fixed_array = FixedArray::cast(obj);
-  if (fixed_array == heap->string_table()) {
-    heap->object_stats_->RecordFixedArraySubTypeStats(STRING_TABLE_SUB_TYPE,
-                                                      fixed_array->Size());
+void ObjectStatsCollector::RecordSharedFunctionInfoDetails(ObjectStats* stats,
+                                                           Heap* heap,
+                                                           HeapObject* obj) {
+  SharedFunctionInfo* sfi = SharedFunctionInfo::cast(obj);
+  if (sfi->scope_info() != heap->empty_fixed_array()) {
+    stats->RecordFixedArraySubTypeStats(SCOPE_INFO_SUB_TYPE,
+                                        sfi->scope_info()->Size(), 0);
+  }
+  if (sfi->feedback_metadata() != heap->empty_fixed_array()) {
+    stats->RecordFixedArraySubTypeStats(TYPE_FEEDBACK_METADATA_TYPE,
+                                        sfi->feedback_metadata()->Size(), 0);
   }
 }
 
-void MarkCompactObjectStatsVisitor::Initialize(
-    VisitorDispatchTable<Callback>* original) {
-  // Copy the original visitor table to make call-through possible. After we
-  // preserved a copy locally, we patch the original table to call us.
-  table_.CopyFrom(original);
-#define COUNT_FUNCTION(id) original->Register(kVisit##id, Visit<kVisit##id>);
-  VISITOR_ID_LIST(COUNT_FUNCTION)
-#undef COUNT_FUNCTION
-}
-
-template <MarkCompactObjectStatsVisitor::VisitorId id>
-void MarkCompactObjectStatsVisitor::Visit(Map* map, HeapObject* obj) {
-  ObjectStatsCollector::CollectStatistics(id, map, obj);
-  table_.GetVisitorById(id)(map, obj);
-  ObjectStatsCollector::CollectFixedArrayStatistics(obj);
-}
-
-void IncrementalMarkingObjectStatsVisitor::Initialize(
-    VisitorDispatchTable<Callback>* original) {
-  // Copy the original visitor table to make call-through possible. After we
-  // preserved a copy locally, we patch the original table to call us.
-  table_.CopyFrom(original);
-#define COUNT_FUNCTION(id) original->Register(kVisit##id, Visit<kVisit##id>);
-  VISITOR_ID_LIST(COUNT_FUNCTION)
-#undef COUNT_FUNCTION
-}
-
-template <IncrementalMarkingObjectStatsVisitor::VisitorId id>
-void IncrementalMarkingObjectStatsVisitor::Visit(Map* map, HeapObject* obj) {
-  ObjectStatsCollector::CollectStatistics(id, map, obj);
-  table_.GetVisitorById(id)(map, obj);
-  ObjectStatsCollector::CollectFixedArrayStatistics(obj);
+void ObjectStatsCollector::RecordFixedArrayDetails(ObjectStats* stats,
+                                                   Heap* heap,
+                                                   HeapObject* obj) {
+  FixedArray* fixed_array = FixedArray::cast(obj);
+  if (fixed_array == heap->string_table()) {
+    stats->RecordFixedArraySubTypeStats(STRING_TABLE_SUB_TYPE,
+                                        fixed_array->Size(), 0);
+  }
 }
 
 }  // namespace internal
 }  // namespace v8