protected IEnumerator<object> SnapshotIOTask()
{
ActivityIndicator.Item progress = null;
IFuture previousSnapshot = null;
while (true) {
if ((SnapshotLoadQueue.Count <= 0) && (previousSnapshot != null))
yield return previousSnapshot;
if (SnapshotLoadQueue.Count <= 0) {
SnapshotLoadState.Count = 0;
if (progress != null) {
progress.Dispose();
progress = null;
}
}
var f = SnapshotLoadQueue.Dequeue();
using (f)
yield return f;
var filename = f.Result;
if (progress == null)
progress = Activities.AddItem("Loading snapshots");
using (var fda = new FileDataAdapter(
filename, FileMode.Open,
FileAccess.Read, FileShare.Read, 1024 * 128
)) {
var maximum = SnapshotLoadState.Count + Math.Max(0, SnapshotLoadQueue.Count) + 1;
progress.Maximum = maximum;
progress.Progress = Math.Min(maximum, SnapshotLoadState.Count);
var fBytes = fda.ReadToEnd();
yield return fBytes;
var fText = Future.RunInThread(
() => Encoding.ASCII.GetString(fBytes.Result)
);
yield return fText;
var text = fText.Result;
fBytes = null;
fText = null;
// Wait for the last snapshot load we triggered to finish
if (previousSnapshot != null)
yield return previousSnapshot;
previousSnapshot = Scheduler.Start(
FinishLoadingSnapshot(filename, text), TaskExecutionPolicy.RunAsBackgroundTask
);
text = null;
}
}
}
public static IEnumerator<object> FromFile(string filename, IProgressListener progress)
{
progress.Status = "Loading diff...";
Future<string> fText;
// We could stream the lines in from the IO thread while we parse them, but this
// part of the load is usually pretty quick even on a regular hard disk, and
// loading the whole diff at once eliminates some context switches
using (var fda = new FileDataAdapter(
filename, FileMode.Open,
FileAccess.Read, FileShare.Read, 1024 * 128
)) {
var fBytes = fda.ReadToEnd();
yield return fBytes;
fText = Future.RunInThread(
() => Encoding.ASCII.GetString(fBytes.Result)
);
yield return fText;
}
yield return fText;
var lr = new LineReader(fText.Result);
LineReader.Line line;
progress.Status = "Parsing diff...";
var frames = new List<TracebackFrame>();
var moduleNames = new NameTable(StringComparer.Ordinal);
var symbolTypes = new NameTable(StringComparer.Ordinal);
var functionNames = new NameTable(StringComparer.Ordinal);
var deltas = new List<DeltaInfo>();
var tracebacks = new Dictionary<UInt32, TracebackInfo>();
var regexes = new Regexes();
// Regex.Groups[string] does an inefficient lookup, so we do that lookup once here
int groupModule = regexes.DiffModule.GroupNumberFromName("module");
int groupSymbolType = regexes.DiffModule.GroupNumberFromName("symbol_type");
int groupTraceId = regexes.BytesDelta.GroupNumberFromName("trace_id");
int groupType = regexes.BytesDelta.GroupNumberFromName("type");
int groupDeltaBytes = regexes.BytesDelta.GroupNumberFromName("delta_bytes");
int groupNewBytes = regexes.BytesDelta.GroupNumberFromName("new_bytes");
int groupOldBytes = regexes.BytesDelta.GroupNumberFromName("old_bytes");
int groupNewCount = regexes.BytesDelta.GroupNumberFromName("new_count");
int groupOldCount = regexes.CountDelta.GroupNumberFromName("old_count");
int groupCountDelta = regexes.CountDelta.GroupNumberFromName("delta_count");
int groupTracebackModule = regexes.TracebackFrame.GroupNumberFromName("module");
int groupTracebackFunction = regexes.TracebackFrame.GroupNumberFromName("function");
int groupTracebackOffset = regexes.TracebackFrame.GroupNumberFromName("offset");
int groupTracebackOffset2 = regexes.TracebackFrame.GroupNumberFromName("offset2");
int groupTracebackPath = regexes.TracebackFrame.GroupNumberFromName("path");
int groupTracebackLine = regexes.TracebackFrame.GroupNumberFromName("line");
int i = 0;
while (lr.ReadLine(out line)) {
if (i % ProgressInterval == 0) {
progress.Maximum = lr.Length;
progress.Progress = lr.Position;
// Suspend processing until any messages in the windows message queue have been processed
yield return new Yield();
}
retryFromHere:
Match m;
if (regexes.DiffModule.TryMatch(ref line, out m)) {
moduleNames.Add(m.Groups[groupModule].Value);
} else if (regexes.BytesDelta.TryMatch(ref line, out m)) {
var traceId = UInt32.Parse(m.Groups[groupTraceId].Value, NumberStyles.HexNumber);
var info = new DeltaInfo {
Added = (m.Groups[groupType].Value == "+"),
BytesDelta = int.Parse(m.Groups[groupDeltaBytes].Value, NumberStyles.HexNumber),
NewBytes = int.Parse(m.Groups[groupNewBytes].Value, NumberStyles.HexNumber),
OldBytes = int.Parse(m.Groups[groupOldBytes].Value, NumberStyles.HexNumber),
NewCount = int.Parse(m.Groups[groupNewCount].Value, NumberStyles.HexNumber),
};
if (lr.ReadLine(out line)) {
if (regexes.CountDelta.TryMatch(ref line, out m)) {
info.OldCount = int.Parse(m.Groups[groupOldCount].Value, NumberStyles.HexNumber);
info.CountDelta = int.Parse(m.Groups[groupCountDelta].Value, NumberStyles.HexNumber);
}
}
bool readingLeadingWhitespace = true, doRetry = false;
frames.Clear();
var itemModules = new NameTable(StringComparer.Ordinal);
var itemFunctions = new NameTable(StringComparer.Ordinal);
while (lr.ReadLine(out line)) {
if (line.ToString().Trim().Length == 0) {
if (readingLeadingWhitespace)
continue;
else
break;
} else if (regexes.TracebackFrame.TryMatch(ref line, out m)) {
readingLeadingWhitespace = false;
var moduleName = moduleNames[m.Groups[groupTracebackModule].Value];
itemModules.Add(moduleName);
var functionName = functionNames[m.Groups[groupTracebackFunction].Value];
itemFunctions.Add(functionName);
var frame = new TracebackFrame {
Module = moduleName,
Function = functionName,
Offset = UInt32.Parse(m.Groups[groupTracebackOffset].Value, NumberStyles.HexNumber)
};
if (m.Groups[groupTracebackOffset2].Success)
frame.Offset2 = UInt32.Parse(m.Groups[groupTracebackOffset2].Value, NumberStyles.HexNumber);
if (m.Groups[groupTracebackPath].Success)
frame.SourceFile = m.Groups[groupTracebackPath].Value;
if (m.Groups[groupTracebackLine].Success)
frame.SourceLine = int.Parse(m.Groups[groupTracebackLine].Value);
frames.Add(frame);
} else {
// We hit the beginning of a new allocation, so make sure it gets parsed
doRetry = true;
break;
}
}
if (tracebacks.ContainsKey(traceId)) {
info.Traceback = tracebacks[traceId];
Console.WriteLine("Duplicate traceback for id {0}!", traceId);
} else {
var frameArray = ImmutableArrayPool<TracebackFrame>.Allocate(frames.Count);
frames.CopyTo(frameArray.Array, frameArray.Offset);
info.Traceback = tracebacks[traceId] = new TracebackInfo {
TraceId = traceId,
Frames = frameArray,
Modules = itemModules,
Functions = itemFunctions
};
}
deltas.Add(info);
if (doRetry)
goto retryFromHere;
} else if (line.StartsWith("//")) {
// Comment, ignore it
} else if (line.StartsWith("Total increase") || line.StartsWith("Total decrease")) {
// Ignore this too
} else if (line.StartsWith(" ") && (line.EndsWith(".pdb"))) {
// Symbol path for a module, ignore it
} else {
Console.WriteLine("Unrecognized diff content: {0}", line.ToString());
}
}
var result = new HeapDiff(
filename, moduleNames, functionNames, deltas, tracebacks
);
yield return new Result(result);
}
