/
Program.cs
106 lines (87 loc) · 3.61 KB
/
Program.cs
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namespace CatchingObjectsSample
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.CLR;
internal class Program
{
private static readonly IntPtr MscorlibModule;
static unsafe Program()
{
MscorlibModule = (IntPtr) ((MethodTableInfo*) typeof (string).TypeHandle.Value)->ModuleInfo;
}
private static unsafe void Main()
{
var objects = new Dictionary<Type, int>(7000);
// Get current heap ranges
IntPtr managedStart, managedEnd;
Console.ReadKey();
MemAccessor.GetManagedHeap(out managedStart, out managedEnd);
// for each byte in virtual memory block, we trying to find strings
var stopwatch = Stopwatch.StartNew();
for (IntPtr* ptr = (IntPtr*) managedStart, end = (IntPtr*) managedEnd; ptr < end; ptr++)
{
if (IsCorrectMethodsTable(*ptr))
{
// checking next object.
int size;
try
{
size = GCEx.SizeOf((EntityInfo*) (ptr - 1)) >> 2;
}
catch (OverflowException)
{
continue;
}
if (ptr + size > (long*) managedEnd)
continue;
{
var found = EntityPtr.ToInstance<object>((IntPtr) (ptr - 1));
RegisterObject(objects, found);
var lastInChain = found;
foreach (var item in GCEx.GetObjectsInSOH(found, hmt => IsCorrectMethodsTable((IntPtr) hmt)))
{
RegisterObject(objects, item.Item);
if (!item.IsArrayItem) lastInChain = item.Item;
}
long lastRecognized = (long) EntityPtr.ToPointer(lastInChain);
ptr = (IntPtr*) (lastRecognized + lastInChain.SizeOf());
}
}
}
var timeToTakeSnapshot = stopwatch.ElapsedMilliseconds;
foreach (var type in objects.Keys.OrderByDescending(key => objects[key]))
{
Console.WriteLine("{0:00000} : {1}", objects[type], type.FullName);
}
Console.WriteLine("Objects total: {0}. Time taken: {1}", objects.Values.Sum(), timeToTakeSnapshot);
Console.ReadKey();
}
private static unsafe bool IsCorrectMethodsTable(IntPtr mt)
{
if (mt == IntPtr.Zero) return false;
if (PointsToAllocated(mt))
if (PointsToAllocated((IntPtr) ((MethodTableInfo*) mt)->EEClass))
if (PointsToAllocated((IntPtr) ((MethodTableInfo*) mt)->EEClass->MethodsTable))
return ((IntPtr) ((MethodTableInfo*) mt)->EEClass->MethodsTable == mt) ||
((IntPtr) ((MethodTableInfo*) mt)->ModuleInfo == MscorlibModule);
return false;
}
private static bool PointsToAllocated(IntPtr ptr)
{
if (ptr == IntPtr.Zero) return false;
return !WinApi.IsBadReadPtr(ptr, 32);
}
private static void RegisterObject(Dictionary<Type, int> dict, object obj)
{
var type = obj.GetType();
if (!dict.ContainsKey(type))
{
dict[type] = 0;
}
dict[type] = dict[type] + 1;
}
}
}