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using System;

using System.Collections.Generic;

using System.Globalization;

using System.IO;

using Microsoft.VisualStudio;

using Microsoft.VisualStudio.Debugger;

using Microsoft.VisualStudio.Debugger.CallStack;

using Microsoft.VisualStudio.Debugger.ComponentInterfaces;

using Microsoft.VisualStudio.Shell;

using Microsoft.VisualStudio.Shell.Interop;

namespace UnityMixedCallstack

{

public class UnityMixedCallstackFilter : IDkmCallStackFilter, IDkmLoadCompleteNotification, IDkmModuleInstanceLoadNotification

{

private static List<Range> _rangesSortedByIp = new List<Range>();

private static FuzzyRangeComparer _comparer = new FuzzyRangeComparer();

private static bool _enabled;

private static IVsOutputWindowPane _debugPane;

private static string _currentFile;

private static FileStream _fileStream;

private static StreamReader _fileStreamReader;

public void OnLoadComplete(DkmProcess process, DkmWorkList workList, DkmEventDescriptor eventDescriptor)

{

DisposeStreams();

if (_debugPane == null)

{

IVsOutputWindow outWindow = Package.GetGlobalService(typeof(SVsOutputWindow)) as IVsOutputWindow;

Guid debugPaneGuid = VSConstants.GUID_OutWindowDebugPane;

outWindow?.GetPane(ref debugPaneGuid, out _debugPane);

}

public DkmStackWalkFrame[] FilterNextFrame(DkmStackContext stackContext, DkmStackWalkFrame input)

{

if (input == null) // after last frame

return null;

if (input.InstructionAddress == null) // error case

return new[] { input };

if (input.InstructionAddress.ModuleInstance != null && input.InstructionAddress.ModuleInstance.Module != null) // code in existing module

return new[] { input };

if (!_enabled) // environment variable not set

return new[] { input };

return new[] { UnityMixedStackFrame(stackContext, input) };

}

private static DkmStackWalkFrame UnityMixedStackFrame(DkmStackContext stackContext, DkmStackWalkFrame frame)

{

RefreshStackData(frame.Process.LivePart.Id);

string name = null;

if (TryGetDescriptionForIp(frame.InstructionAddress.CPUInstructionPart.InstructionPointer, out name))

return DkmStackWalkFrame.Create(

stackContext.Thread,

frame.InstructionAddress,

frame.FrameBase,

frame.FrameSize,

frame.Flags,

name,

frame.Registers,

frame.Annotations);

return frame;

}

private static int GetFileNameSequenceNum(string path)

{

var name = Path.GetFileNameWithoutExtension(path);

const char delemiter = '_';

var tokens = name.Split(delemiter);

if (tokens.Length != 3)

return -1;

return int.Parse(tokens[2]);

}

private static void DisposeStreams()

{

_fileStreamReader?.Dispose();

_fileStreamReader = null;

_fileStream?.Dispose();

_fileStream = null;

_currentFile = null;

_rangesSortedByIp.Clear();

}

private static void RefreshStackData(int pid)

{

DirectoryInfo taskDirectory = new DirectoryInfo(Path.GetTempPath());

FileInfo[] taskFiles = taskDirectory.GetFiles("pmip_" + pid + "_*.txt");

if (taskFiles.Length < 1)

return;

Array.Sort(taskFiles, (a, b) => GetFileNameSequenceNum(a.Name).CompareTo(GetFileNameSequenceNum(b.Name)));

var fileName = taskFiles[taskFiles.Length - 1].FullName;

if (_currentFile != fileName)

{

DisposeStreams();

try

{

_fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite | FileShare.Delete);

_fileStreamReader = new StreamReader(_fileStream);

_currentFile = fileName;

var versionStr = _fileStreamReader.ReadLine();

const char delimiter = ':';

var tokens = versionStr.Split(delimiter);

if (tokens.Length != 2)

throw new Exception("Failed reading input file " + fileName + ": Incorrect format");

var version = double.Parse(tokens[1]);

if(version > 1.0)

throw new Exception("Failed reading input file " + fileName + ": A newer version of UnityMixedCallstacks plugin is required to read this file");

}

catch (Exception ex)

{

_debugPane?.OutputString("Unable to read dumped pmip file: " + ex.Message + "\n");

DisposeStreams();

_enabled = false;

return;

}

try

{

string line;

while ((line = _fileStreamReader.ReadLine()) != null)

{

const char delemiter = ';';

var tokens = line.Split(delemiter);

//should never happen, but lets be safe and not get array out of bounds if it does

if (tokens.Length != 3)

continue;

var startip = tokens[0];

var endip = tokens[1];

var description = tokens[2];

var startiplong = ulong.Parse(startip, NumberStyles.HexNumber);

var endipint = ulong.Parse(endip, NumberStyles.HexNumber);

_rangesSortedByIp.Add(new Range() { Name = description, Start = startiplong, End = endipint });

}

catch (Exception ex)

{

_debugPane?.OutputString("Unable to read dumped pmip file: " + ex.Message + "\n");

DisposeStreams();

_enabled = false;

return;

}

_rangesSortedByIp.Sort((r1, r2) => r1.Start.CompareTo(r2.Start));

}

private static bool TryGetDescriptionForIp(ulong ip, out string name)

{

name = string.Empty;

var rangeToFindIp = new Range() { Start = ip };

var index = _rangesSortedByIp.BinarySearch(rangeToFindIp, _comparer);

if (index < 0)

return false;

name = _rangesSortedByIp[index].Name;

return true;

}

public void OnModuleInstanceLoad(DkmModuleInstance moduleInstance, DkmWorkList workList, DkmEventDescriptorS eventDescriptor)

{

if (moduleInstance.Name.Contains("mono-2.0") && moduleInstance.MinidumpInfoPart == null)

_enabled = true;

}