private GraphReuseResult ReloadPipGraphOnly(
EngineSerializer serializer,
LoggingContext loggingContext,
EngineState engineState,
InputTracker.InputChanges inputChanges)
{
Tuple <PipGraph, EngineContext> t = null;
try
{
t = EngineSchedule.LoadPipGraphAsync(
Context,
serializer,
Configuration,
loggingContext,
engineState).GetAwaiter().GetResult();
}
catch (BuildXLException e)
{
Logger.Log.FailedReloadPipGraph(loggingContext, e.ToString());
}
if (t == null)
{
return(GraphReuseResult.CreateForNoReuse(inputChanges));
}
var newContext = t.Item2;
if (!ShouldReuseReloadedEngineContextGivenHistoricData(loggingContext, newContext.NextHistoricTableSizes))
{
return(GraphReuseResult.CreateForNoReuse(inputChanges));
}
var newPathTable = newContext.PathTable;
var pathRemapper = new PathRemapper(Context.PathTable, newPathTable);
Configuration = new ConfigurationImpl(Configuration, pathRemapper);
m_initialCommandLineConfiguration = new CommandLineConfiguration(m_initialCommandLineConfiguration, pathRemapper);
// Invalidate the old context to ensure nothing uses it anymore
// Update engine state to deserialized state
Context.Invalidate();
Context = newContext;
// Additionally recreate front end controller, because the old one uses the invalidated context.
// - to fully initialize the front end, we have to go through all the steps that have already been
// executed on the old controller; those steps are (1) InitializeHost, and (2) ParseConfig
FrontEndController = m_frontEndControllerFactory.Create(Context.PathTable, Context.SymbolTable);
FrontEndController.InitializeHost(Context.ToFrontEndContext(loggingContext), m_initialCommandLineConfiguration);
var configurationEngine = new BasicFrontEndEngineAbstraction(Context.PathTable, Context.FileSystem, m_initialCommandLineConfiguration);
if (!configurationEngine.TryPopulateWithDefaultMountsTable(loggingContext, Context, m_initialCommandLineConfiguration, m_initialCommandLineConfiguration.Startup.Properties))
{
Contract.Assert(loggingContext.ErrorWasLogged);
return(null);
}
FrontEndController.ParseConfig(configurationEngine, m_initialCommandLineConfiguration);
return(GraphReuseResult.CreateForPartialReuse(t.Item1, inputChanges));
}
/// <summary>
/// Attempt to reuse the pip graph from a previous run
/// </summary>
private GraphReuseResult AttemptToReuseGraph(
LoggingContext outerLoggingContext,
int maxDegreeOfParallelism,
GraphFingerprint graphFingerprint,
IReadOnlyDictionary <string, string> properties,
CacheInitializationTask cacheInitializationTask,
JournalState journalState,
EngineState engineState)
{
GraphCacheCheckStatistics cacheGraphStats = CheckGraphCacheReuse(
outerLoggingContext,
maxDegreeOfParallelism,
graphFingerprint,
properties,
cacheInitializationTask,
journalState,
out var serializer,
out var inputChanges);
// There are 3 cases in which we should reload the graph
// - we have a graph cache hit
// - the build is configured to reload the graph no matter what
// - graph patching is enabled and the reason for cache miss was 'SpecFileChanges'
var shouldReload =
cacheGraphStats.WasHit ||
Configuration.Cache.CachedGraphPathToLoad.IsValid ||
PartialReloadCondition(Configuration.FrontEnd, cacheGraphStats);
if (!shouldReload)
{
return(GraphReuseResult.CreateForNoReuse(inputChanges));
}
bool fullReload = !PartialReloadCondition(Configuration.FrontEnd, cacheGraphStats);
// Now we actually reload the graph
var reloadStats = default(GraphCacheReloadStatistics);
using (var tb = TimedBlock <EmptyStruct, GraphCacheReloadStatistics> .Start(
outerLoggingContext,
Statistics.GraphCacheReload,
(context, emptyStruct) =>
{
if (fullReload)
{
Logger.Log.ReloadingPipGraphStart(context);
}
else
{
Logger.Log.PartiallyReloadingEngineState(context);
}
},
default(EmptyStruct),
(context, graphCacheCheckStatistics) =>
{
Logger.Log.PartiallyReloadingEngineStateComplete(context, graphCacheCheckStatistics);
m_enginePerformanceInfo.GraphReloadDurationMs = graphCacheCheckStatistics.ElapsedMilliseconds;
},
() => reloadStats))
{
var reuseResult = fullReload
? ReloadEngineSchedule(
serializer,
cacheInitializationTask,
journalState,
tb.LoggingContext,
engineState,
inputChanges,
graphFingerprint?.ExactFingerprint.BuildEngineHash.ToString())
: ReloadPipGraphOnly(serializer, tb.LoggingContext, engineState, inputChanges);
// Set telemetry statistics
reloadStats.SerializedFileSizeBytes = serializer.BytesDeserialized;
reloadStats.Success = !reuseResult.IsNoReuse;
return(reuseResult);
}
}