v8/src/heap-profiler.cc

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// Copyright 2009-2010 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/v8.h"
#include "src/heap-profiler.h"
#include "src/allocation-tracker.h"
#include "src/heap-snapshot-generator-inl.h"
namespace v8 {
namespace internal {
HeapProfiler::HeapProfiler(Heap* heap)
: ids_(new HeapObjectsMap(heap)),
names_(new StringsStorage(heap)),
is_tracking_object_moves_(false) {
}
static void DeleteHeapSnapshot(HeapSnapshot** snapshot_ptr) {
delete *snapshot_ptr;
}
HeapProfiler::~HeapProfiler() {
snapshots_.Iterate(DeleteHeapSnapshot);
snapshots_.Clear();
}
void HeapProfiler::DeleteAllSnapshots() {
snapshots_.Iterate(DeleteHeapSnapshot);
snapshots_.Clear();
names_.Reset(new StringsStorage(heap()));
}
void HeapProfiler::RemoveSnapshot(HeapSnapshot* snapshot) {
snapshots_.RemoveElement(snapshot);
}
void HeapProfiler::DefineWrapperClass(
uint16_t class_id, v8::HeapProfiler::WrapperInfoCallback callback) {
DCHECK(class_id != v8::HeapProfiler::kPersistentHandleNoClassId);
if (wrapper_callbacks_.length() <= class_id) {
wrapper_callbacks_.AddBlock(
NULL, class_id - wrapper_callbacks_.length() + 1);
}
wrapper_callbacks_[class_id] = callback;
}
v8::RetainedObjectInfo* HeapProfiler::ExecuteWrapperClassCallback(
uint16_t class_id, Object** wrapper) {
if (wrapper_callbacks_.length() <= class_id) return NULL;
return wrapper_callbacks_[class_id](
class_id, Utils::ToLocal(Handle<Object>(wrapper)));
}
HeapSnapshot* HeapProfiler::TakeSnapshot(
v8::ActivityControl* control,
v8::HeapProfiler::ObjectNameResolver* resolver) {
HeapSnapshot* result = new HeapSnapshot(this);
{
HeapSnapshotGenerator generator(result, control, resolver, heap());
if (!generator.GenerateSnapshot()) {
delete result;
result = NULL;
} else {
snapshots_.Add(result);
}
}
ids_->RemoveDeadEntries();
is_tracking_object_moves_ = true;
return result;
}
void HeapProfiler::StartHeapObjectsTracking(bool track_allocations) {
ids_->UpdateHeapObjectsMap();
is_tracking_object_moves_ = true;
DCHECK(!is_tracking_allocations());
if (track_allocations) {
allocation_tracker_.Reset(new AllocationTracker(ids_.get(), names_.get()));
heap()->DisableInlineAllocation();
}
}
SnapshotObjectId HeapProfiler::PushHeapObjectsStats(OutputStream* stream,
int64_t* timestamp_us) {
return ids_->PushHeapObjectsStats(stream, timestamp_us);
}
void HeapProfiler::StopHeapObjectsTracking() {
ids_->StopHeapObjectsTracking();
if (is_tracking_allocations()) {
allocation_tracker_.Reset(NULL);
heap()->EnableInlineAllocation();
}
}
size_t HeapProfiler::GetMemorySizeUsedByProfiler() {
size_t size = sizeof(*this);
size += names_->GetUsedMemorySize();
size += ids_->GetUsedMemorySize();
size += GetMemoryUsedByList(snapshots_);
for (int i = 0; i < snapshots_.length(); ++i) {
size += snapshots_[i]->RawSnapshotSize();
}
return size;
}
int HeapProfiler::GetSnapshotsCount() {
return snapshots_.length();
}
HeapSnapshot* HeapProfiler::GetSnapshot(int index) {
return snapshots_.at(index);
}
SnapshotObjectId HeapProfiler::GetSnapshotObjectId(Handle<Object> obj) {
if (!obj->IsHeapObject())
return v8::HeapProfiler::kUnknownObjectId;
return ids_->FindEntry(HeapObject::cast(*obj)->address());
}
void HeapProfiler::ObjectMoveEvent(Address from, Address to, int size) {
bool known_object = ids_->MoveObject(from, to, size);
if (!known_object && !allocation_tracker_.is_empty()) {
allocation_tracker_->address_to_trace()->MoveObject(from, to, size);
}
}
void HeapProfiler::AllocationEvent(Address addr, int size) {
DisallowHeapAllocation no_allocation;
if (!allocation_tracker_.is_empty()) {
allocation_tracker_->AllocationEvent(addr, size);
}
}
void HeapProfiler::UpdateObjectSizeEvent(Address addr, int size) {
ids_->UpdateObjectSize(addr, size);
}
void HeapProfiler::SetRetainedObjectInfo(UniqueId id,
RetainedObjectInfo* info) {
// TODO(yurus, marja): Don't route this information through GlobalHandles.
heap()->isolate()->global_handles()->SetRetainedObjectInfo(id, info);
}
Handle<HeapObject> HeapProfiler::FindHeapObjectById(SnapshotObjectId id) {
HeapObject* object = NULL;
HeapIterator iterator(heap(), HeapIterator::kFilterUnreachable);
// Make sure that object with the given id is still reachable.
for (HeapObject* obj = iterator.next();
obj != NULL;
obj = iterator.next()) {
if (ids_->FindEntry(obj->address()) == id) {
DCHECK(object == NULL);
object = obj;
// Can't break -- kFilterUnreachable requires full heap traversal.
}
}
return object != NULL ? Handle<HeapObject>(object) : Handle<HeapObject>();
}
void HeapProfiler::ClearHeapObjectMap() {
ids_.Reset(new HeapObjectsMap(heap()));
if (!is_tracking_allocations()) is_tracking_object_moves_ = false;
}
} } // namespace v8::internal