public PackedCrawlerData(PackedMemorySnapshot packedMemorySnapshot)
{
this.packedMemorySnapshot = packedMemorySnapshot;
typesWithStaticFields = packedMemorySnapshot.typeDescriptions.Where(t => t.staticFieldBytes != null && t.staticFieldBytes.Length > 0).ToArray();
startIndices = new StartIndices(this.packedMemorySnapshot.gcHandles.Length, this.packedMemorySnapshot.nativeObjects.Length, typesWithStaticFields.Length);
valid = true;
}
private void CrawlPointer(PackedMemorySnapshot packedMemorySnapshot, StartIndices startIndices, ulong pointer, int indexOfFrom, List <Connection> out_connections, List <PackedManagedObject> out_managedObjects)
{
var bo = packedMemorySnapshot.managedHeapSections.Find(pointer, _virtualMachineInformation);
if (!bo.IsValid)
{
return;
}
UInt64 typeInfoAddress;
int indexOfObject;
bool wasAlreadyCrawled;
try {
ParseObjectHeader(startIndices, packedMemorySnapshot.managedHeapSections, pointer, out typeInfoAddress, out indexOfObject, out wasAlreadyCrawled, out_managedObjects);
} catch (Exception e) {
UnityEngine.Debug.LogWarningFormat("Exception parsing object header. Skipping. {0}", e);
return;
}
out_connections.Add(new Connection()
{
from = indexOfFrom, to = indexOfObject
});
if (wasAlreadyCrawled)
{
return;
}
var typeDescription = _typeInfoToTypeDescription[typeInfoAddress];
if (!typeDescription.isArray)
{
CrawlRawObjectData(packedMemorySnapshot, startIndices, bo.Add(_virtualMachineInformation.objectHeaderSize), typeDescription, false, indexOfObject, out_connections, out_managedObjects);
return;
}
var arrayLength = ArrayTools.ReadArrayLength(packedMemorySnapshot.managedHeapSections, pointer, typeDescription, _virtualMachineInformation);
var elementType = packedMemorySnapshot.typeDescriptions[typeDescription.baseOrElementTypeIndex];
var cursor = bo.Add(_virtualMachineInformation.arrayHeaderSize);
for (int i = 0; i != arrayLength; i++)
{
if (elementType.isValueType)
{
CrawlRawObjectData(packedMemorySnapshot, startIndices, cursor, elementType, false, indexOfObject, out_connections, out_managedObjects);
cursor = cursor.Add(elementType.size);
}
else
{
CrawlPointer(packedMemorySnapshot, startIndices, cursor.ReadPointer(), indexOfObject, out_connections, out_managedObjects);
cursor = cursor.NextPointer();
}
}
}
private void ParseObjectHeader(StartIndices startIndices, MemorySection[] heap, ulong originalHeapAddress, out ulong typeInfoAddress, out int indexOfObject, out bool wasAlreadyCrawled, List <PackedManagedObject> outManagedObjects)
{
var bo = heap.Find(originalHeapAddress, _virtualMachineInformation);
var pointer1 = bo.ReadPointer();
var pointer2 = bo.NextPointer();
if (HasMarkBit(pointer1) == 0)
{
wasAlreadyCrawled = false;
indexOfObject = outManagedObjects.Count + startIndices.OfFirstManagedObject;
typeInfoAddress = pointer1;
var typeDescription = _typeInfoToTypeDescription[pointer1];
var size = SizeOfObjectInBytes(typeDescription, bo, heap, originalHeapAddress);
outManagedObjects.Add(new PackedManagedObject()
{
address = originalHeapAddress, size = size, typeIndex = typeDescription.typeIndex
});
//okay, we gathered all information, now lets set the mark bit, and store the index for this object in the 2nd pointer of the header, which is rarely used.
bo.WritePointer(pointer1 | 1);
//test writepointer implementation
ulong magic = bo.pointerSize == 8 ? 0x12345678deadbeefUL : 0xdeadbeef;
pointer2.WritePointer(magic);
var check = pointer2.ReadPointer();
if (check != magic)
{
throw new Exception("writepointer broken");
}
pointer2.WritePointer((ulong)indexOfObject);
return;
}
//give typeinfo address back without the markbit
typeInfoAddress = ClearMarkBit(pointer1);
wasAlreadyCrawled = true;
//read the index for this object that we stored in the 2ndpointer field of the header
indexOfObject = (int)pointer2.ReadPointer();
}
private void CrawlRawObjectData(PackedMemorySnapshot packedMemorySnapshot, StartIndices startIndices, BytesAndOffset bytesAndOffset, TypeDescription typeDescription, bool useStaticFields, int indexOfFrom, List <Connection> out_connections, List <PackedManagedObject> out_managedObjects)
{
foreach (var field in TypeTools.AllFieldsOf(typeDescription, _typeDescriptions, useStaticFields ? TypeTools.FieldFindOptions.OnlyStatic : TypeTools.FieldFindOptions.OnlyInstance))
{
if (field.typeIndex == typeDescription.typeIndex && typeDescription.isValueType)
{
//this happens in System.Single, which is a weird type that has a field of its own type.
continue;
}
if (field.offset == -1)
{
//this is how we encode TLS fields. todo: actually treat TLS fields as roots
continue;
}
var fieldType = packedMemorySnapshot.typeDescriptions[field.typeIndex];
var fieldLocation = bytesAndOffset.Add(field.offset - (useStaticFields ? 0 : _virtualMachineInformation.objectHeaderSize));
if (fieldType.isValueType)
{
CrawlRawObjectData(packedMemorySnapshot, startIndices, fieldLocation, fieldType, false, indexOfFrom, out_connections, out_managedObjects);
continue;
}
//temporary workaround for a bug in 5.3b4 and earlier where we would get literals returned as fields with offset 0. soon we'll be able to remove this code.
bool gotException = false;
try {
fieldLocation.ReadPointer();
} catch (ArgumentException) {
UnityEngine.Debug.LogWarningFormat("Skipping field {0} on type {1}", field.name, typeDescription.name);
UnityEngine.Debug.LogWarningFormat("FieldType.name: {0}", fieldType.name);
gotException = true;
}
if (!gotException)
{
CrawlPointer(packedMemorySnapshot, startIndices, fieldLocation.ReadPointer(), indexOfFrom, out_connections, out_managedObjects);
}
}
}
private IEnumerable <Connection> AddManagedToNativeConnectionsAndRestoreObjectHeaders(PackedMemorySnapshot packedMemorySnapshot, StartIndices startIndices, PackedCrawlerData packedCrawlerData)
{
if (packedMemorySnapshot.typeDescriptions.Length == 0)
{
yield break;
}
var unityEngineObjectTypeDescription = packedMemorySnapshot.typeDescriptions.First(td => td.name == "UnityEngine.Object");
bool unityEngineObjectHasInstanceIDField = unityEngineObjectTypeDescription.fields.Any(f => f.name == "m_InstanceID");
int instanceIDOffset = -1;
if (unityEngineObjectHasInstanceIDField)
{
instanceIDOffset = unityEngineObjectTypeDescription.fields.Single(f => f.name == "m_InstanceID").offset;
}
#if UNITY_5_4_OR_NEWER
var cachedPtrOffset = unityEngineObjectTypeDescription.fields.Single(f => f.name == "m_CachedPtr").offset;
#endif
for (int i = 0; i != packedCrawlerData.managedObjects.Length; i++)
{
var managedObjectIndex = i + startIndices.OfFirstManagedObject;
var address = packedCrawlerData.managedObjects[i].address;
var typeInfoAddress = RestoreObjectHeader(packedMemorySnapshot.managedHeapSections, address, managedObjectIndex);
if (!DerivesFrom(packedMemorySnapshot.typeDescriptions, _typeInfoToTypeDescription[typeInfoAddress].typeIndex, unityEngineObjectTypeDescription.typeIndex))
{
continue;
}
int indexOfNativeObject = -1;
if (unityEngineObjectHasInstanceIDField)
{
var instanceID = packedMemorySnapshot.managedHeapSections.Find(address + (UInt64)instanceIDOffset, packedMemorySnapshot.virtualMachineInformation).ReadInt32();
indexOfNativeObject = Array.FindIndex(packedMemorySnapshot.nativeObjects, no => no.instanceId == instanceID);
}
#if UNITY_5_4_OR_NEWER // Since Unity 5.4, UnityEngine.Object no longer stores instance id inside when running in the player. Use cached ptr instead to find the index of native object
else
{
// If you get a compilation error on the following 2 lines, update to Unity 5.4b14.
var cachedPtr = packedMemorySnapshot.managedHeapSections.Find(address + (UInt64)cachedPtrOffset, packedMemorySnapshot.virtualMachineInformation).ReadPointer();
indexOfNativeObject = Array.FindIndex(packedMemorySnapshot.nativeObjects, no => (ulong)no.nativeObjectAddress == cachedPtr);
}
#endif
if (indexOfNativeObject != -1)
{
yield return new Connection {
@from = managedObjectIndex, to = indexOfNativeObject + startIndices.OfFirstNativeObject
}
}
;
}
}
private void CrawlRawObjectDataNonRecursive(PackedMemorySnapshot packedMemorySnapshot, StartIndices startIndices, BytesAndOffset bytesAndOffset, TypeDescription typeDescription, bool useStaticFields, int indexOfFrom,
List <Connection> out_connections, List <PackedManagedObject> out_managedObjects, Stack <ThingToProfile> out_thingsToProfile)
{
// Do not crawl MemoryProfilerWindow objects
if (typeDescription.name.StartsWith("MemoryProfilerWindow."))
{
return;
}
var fields = useStaticFields ? _staticFields[typeDescription.typeIndex] : _instanceFields[typeDescription.typeIndex];
for (int i = 0; i < fields.Length; ++i)
{
var field = fields[i];
var fieldType = packedMemorySnapshot.typeDescriptions[field.typeIndex];
var fieldLocation = bytesAndOffset.Add(field.offset - (useStaticFields ? 0 : _virtualMachineInformation.objectHeaderSize));
if (fieldType.isValueType)
{
out_thingsToProfile.Push(new ThingToProfile(fieldType, fieldLocation, false, indexOfFrom));
continue;
}
else
{
//temporary workaround for a bug in 5.3b4 and earlier where we would get literals returned as fields with offset 0. soon we'll be able to remove this code.
bool gotException = false;
try
{
fieldLocation.ReadPointer();
}
catch (ArgumentException)
{
UnityEngine.Debug.LogWarningFormat("Skipping field {0} on type {1}", field.name, typeDescription.name);
UnityEngine.Debug.LogWarningFormat("FieldType.name: {0}", fieldType.name);
gotException = true;
}
if (!gotException)
{
out_thingsToProfile.Push(new ThingToProfile(fieldLocation.ReadPointer(), indexOfFrom));
}
}
}
}
