/// <summary>
/// Loads a UBTMakefile from disk
/// </summary>
/// <param name="MakefilePath">Path to the makefile to load</param>
/// <param name="ProjectFile">Path to the project file</param>
/// <param name="ReasonNotLoaded">If the function returns null, this string will contain the reason why</param>
/// <param name="WorkingSet">Interface to query which source files are in the working set</param>
/// <returns>The loaded makefile, or null if it failed for some reason. On failure, the 'ReasonNotLoaded' variable will contain information about why</returns>
public static UBTMakefile LoadUBTMakefile(FileReference MakefilePath, FileReference ProjectFile, ISourceFileWorkingSet WorkingSet, out string ReasonNotLoaded)
{
// Check the directory timestamp on the project files directory. If the user has generated project files more
// recently than the UBTMakefile, then we need to consider the file to be out of date
FileInfo UBTMakefileInfo = new FileInfo(MakefilePath.FullName);
if (!UBTMakefileInfo.Exists)
{
// UBTMakefile doesn't even exist, so we won't bother loading it
ReasonNotLoaded = "no existing makefile";
return(null);
}
// Check the build version
FileInfo BuildVersionFileInfo = new FileInfo(BuildVersion.GetDefaultFileName().FullName);
if (BuildVersionFileInfo.Exists && UBTMakefileInfo.LastWriteTime.CompareTo(BuildVersionFileInfo.LastWriteTime) < 0)
{
Log.TraceVerbose("Existing makefile is older than Build.version, ignoring it");
ReasonNotLoaded = "Build.version is newer";
return(null);
}
// @todo ubtmake: This will only work if the directory timestamp actually changes with every single GPF. Force delete existing files before creating new ones? Eh... really we probably just want to delete + create a file in that folder
// -> UPDATE: Seems to work OK right now though on Windows platform, maybe due to GUID changes
// @todo ubtmake: Some platforms may not save any files into this folder. We should delete + generate a "touch" file to force the directory timestamp to be updated (or just check the timestamp file itself. We could put it ANYWHERE, actually)
// Installed Build doesn't need to check engine projects for outdatedness
if (!UnrealBuildTool.IsEngineInstalled())
{
if (DirectoryReference.Exists(ProjectFileGenerator.IntermediateProjectFilesPath))
{
DateTime EngineProjectFilesLastUpdateTime = new FileInfo(ProjectFileGenerator.ProjectTimestampFile).LastWriteTime;
if (UBTMakefileInfo.LastWriteTime.CompareTo(EngineProjectFilesLastUpdateTime) < 0)
{
// Engine project files are newer than UBTMakefile
Log.TraceVerbose("Existing makefile is older than generated engine project files, ignoring it");
ReasonNotLoaded = "project files are newer";
return(null);
}
}
}
// Check the game project directory too
if (ProjectFile != null)
{
string ProjectFilename = ProjectFile.FullName;
FileInfo ProjectFileInfo = new FileInfo(ProjectFilename);
if (!ProjectFileInfo.Exists || UBTMakefileInfo.LastWriteTime.CompareTo(ProjectFileInfo.LastWriteTime) < 0)
{
// .uproject file is newer than UBTMakefile
Log.TraceVerbose("Makefile is older than .uproject file, ignoring it");
ReasonNotLoaded = ".uproject file is newer";
return(null);
}
DirectoryReference MasterProjectRelativePath = ProjectFile.Directory;
string GameIntermediateProjectFilesPath = Path.Combine(MasterProjectRelativePath.FullName, "Intermediate", "ProjectFiles");
if (Directory.Exists(GameIntermediateProjectFilesPath))
{
DateTime GameProjectFilesLastUpdateTime = new DirectoryInfo(GameIntermediateProjectFilesPath).LastWriteTime;
if (UBTMakefileInfo.LastWriteTime.CompareTo(GameProjectFilesLastUpdateTime) < 0)
{
// Game project files are newer than UBTMakefile
Log.TraceVerbose("Makefile is older than generated game project files, ignoring it");
ReasonNotLoaded = "game project files are newer";
return(null);
}
}
}
// Check to see if UnrealBuildTool.exe was compiled more recently than the UBTMakefile
DateTime UnrealBuildToolTimestamp = new FileInfo(Assembly.GetExecutingAssembly().Location).LastWriteTime;
if (UBTMakefileInfo.LastWriteTime.CompareTo(UnrealBuildToolTimestamp) < 0)
{
// UnrealBuildTool.exe was compiled more recently than the UBTMakefile
Log.TraceVerbose("Makefile is older than UnrealBuildTool.exe, ignoring it");
ReasonNotLoaded = "UnrealBuildTool.exe is newer";
return(null);
}
// Check to see if any BuildConfiguration files have changed since the last build
List <XmlConfig.InputFile> InputFiles = XmlConfig.FindInputFiles();
foreach (XmlConfig.InputFile InputFile in InputFiles)
{
FileInfo InputFileInfo = new FileInfo(InputFile.Location.FullName);
if (InputFileInfo.LastWriteTime > UBTMakefileInfo.LastWriteTime)
{
Log.TraceVerbose("Makefile is older than BuildConfiguration.xml, ignoring it");
ReasonNotLoaded = "BuildConfiguration.xml is newer";
return(null);
}
}
UBTMakefile LoadedUBTMakefile = null;
try
{
DateTime LoadUBTMakefileStartTime = DateTime.UtcNow;
using (FileStream Stream = new FileStream(UBTMakefileInfo.FullName, FileMode.Open, FileAccess.Read))
{
BinaryFormatter Formatter = new BinaryFormatter();
LoadedUBTMakefile = Formatter.Deserialize(Stream) as UBTMakefile;
}
if (UnrealBuildTool.bPrintPerformanceInfo)
{
double LoadUBTMakefileTime = (DateTime.UtcNow - LoadUBTMakefileStartTime).TotalSeconds;
Log.TraceInformation("LoadUBTMakefile took " + LoadUBTMakefileTime + "s");
}
}
catch (Exception Ex)
{
Log.TraceWarning("Failed to read makefile: {0}", Ex.Message);
ReasonNotLoaded = "couldn't read existing makefile";
return(null);
}
if (!LoadedUBTMakefile.IsValidMakefile())
{
Log.TraceWarning("Loaded makefile appears to have invalid contents, ignoring it ({0})", UBTMakefileInfo.FullName);
ReasonNotLoaded = "existing makefile appears to be invalid";
return(null);
}
// Check if any of the target's Build.cs files are newer than the makefile
foreach (UEBuildTarget Target in LoadedUBTMakefile.Targets)
{
string TargetCsFilename = Target.TargetRulesFile.FullName;
if (TargetCsFilename != null)
{
FileInfo TargetCsFile = new FileInfo(TargetCsFilename);
bool bTargetCsFileExists = TargetCsFile.Exists;
if (!bTargetCsFileExists || TargetCsFile.LastWriteTime > UBTMakefileInfo.LastWriteTime)
{
Log.TraceVerbose("{0} has been {1} since makefile was built, ignoring it ({2})", TargetCsFilename, bTargetCsFileExists ? "changed" : "deleted", UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("changes to target files");
return(null);
}
}
IEnumerable <string> BuildCsFilenames = Target.GetAllModuleBuildCsFilenames();
foreach (string BuildCsFilename in BuildCsFilenames)
{
if (BuildCsFilename != null)
{
FileInfo BuildCsFile = new FileInfo(BuildCsFilename);
bool bBuildCsFileExists = BuildCsFile.Exists;
if (!bBuildCsFileExists || BuildCsFile.LastWriteTime > UBTMakefileInfo.LastWriteTime)
{
Log.TraceVerbose("{0} has been {1} since makefile was built, ignoring it ({2})", BuildCsFilename, bBuildCsFileExists ? "changed" : "deleted", UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("changes to module files");
return(null);
}
}
}
foreach (FlatModuleCsDataType FlatCsModuleData in Target.FlatModuleCsData.Values)
{
if (FlatCsModuleData.BuildCsFilename != null && FlatCsModuleData.ExternalDependencies.Count > 0)
{
string BaseDir = Path.GetDirectoryName(FlatCsModuleData.BuildCsFilename);
foreach (string ExternalDependency in FlatCsModuleData.ExternalDependencies)
{
FileInfo DependencyFile = new FileInfo(Path.Combine(BaseDir, ExternalDependency));
bool bDependencyFileExists = DependencyFile.Exists;
if (!bDependencyFileExists || DependencyFile.LastWriteTime > UBTMakefileInfo.LastWriteTime)
{
Log.TraceVerbose("{0} has been {1} since makefile was built, ignoring it ({2})", DependencyFile.FullName, bDependencyFileExists ? "changed" : "deleted", UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("changes to external dependency");
return(null);
}
}
}
}
}
// We do a check to see if any modules' headers have changed which have
// acquired or lost UHT types. If so, which should be rare,
// we'll just invalidate the entire makefile and force it to be rebuilt.
foreach (UEBuildTarget Target in LoadedUBTMakefile.Targets)
{
// Get all H files in processed modules newer than the makefile itself
HashSet <string> HFilesNewerThanMakefile =
new HashSet <string>(
Target.FlatModuleCsData
.SelectMany(x => x.Value.ModuleSourceFolder != null ? Directory.EnumerateFiles(x.Value.ModuleSourceFolder.FullName, "*.h", SearchOption.AllDirectories) : Enumerable.Empty <string>())
.Where(y => Directory.GetLastWriteTimeUtc(y) > UBTMakefileInfo.LastWriteTimeUtc)
.OrderBy(z => z).Distinct()
);
// Get all H files in all modules processed in the last makefile build
HashSet <string> AllUHTHeaders = new HashSet <string>(Target.FlatModuleCsData.Select(x => x.Value).SelectMany(x => x.UHTHeaderNames));
// Check whether any headers have been deleted. If they have, we need to regenerate the makefile since the module might now be empty. If we don't,
// and the file has been moved to a different module, we may include stale generated headers.
foreach (string FileName in AllUHTHeaders)
{
if (!File.Exists(FileName))
{
Log.TraceVerbose("File processed by UHT was deleted ({0}); invalidating makefile", FileName);
ReasonNotLoaded = string.Format("UHT file was deleted");
return(null);
}
}
// Makefile is invalid if:
// * There are any newer files which contain no UHT data, but were previously in the makefile
// * There are any newer files contain data which needs processing by UHT, but weren't not previously in the makefile
foreach (string Filename in HFilesNewerThanMakefile)
{
bool bContainsUHTData = CPPHeaders.DoesFileContainUObjects(Filename);
bool bWasProcessed = AllUHTHeaders.Contains(Filename);
if (bContainsUHTData != bWasProcessed)
{
Log.TraceVerbose("{0} {1} contain UHT types and now {2} , ignoring it ({3})", Filename, bWasProcessed ? "used to" : "didn't", bWasProcessed ? "doesn't" : "does", UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("new files with reflected types");
return(null);
}
}
}
// If adaptive unity build is enabled, do a check to see if there are any source files that became part of the
// working set since the Makefile was created (or, source files were removed from the working set.) If anything
// changed, then we'll force a new Makefile to be created so that we have fresh unity build blobs. We always
// want to make sure that source files in the working set are excluded from those unity blobs (for fastest possible
// iteration times.)
if (LoadedUBTMakefile.bUseAdaptiveUnityBuild)
{
// Check if any source files in the working set no longer belong in it
foreach (FileItem SourceFile in LoadedUBTMakefile.SourceFileWorkingSet)
{
if (!WorkingSet.Contains(SourceFile.Location) && File.GetLastWriteTimeUtc(SourceFile.AbsolutePath) > UBTMakefileInfo.LastWriteTimeUtc)
{
Log.TraceVerbose("{0} was part of source working set and now is not; invalidating makefile ({1})", SourceFile.AbsolutePath, UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("working set of source files changed");
return(null);
}
}
// Check if any source files that are eligible for being in the working set have been modified
foreach (FileItem SourceFile in LoadedUBTMakefile.CandidateSourceFilesForWorkingSet)
{
if (WorkingSet.Contains(SourceFile.Location) && File.GetLastWriteTimeUtc(SourceFile.AbsolutePath) > UBTMakefileInfo.LastWriteTimeUtc)
{
Log.TraceVerbose("{0} was part of source working set and now is not; invalidating makefile ({1})", SourceFile.AbsolutePath, UBTMakefileInfo.FullName);
ReasonNotLoaded = string.Format("working set of source files changed");
return(null);
}
}
}
ReasonNotLoaded = null;
return(LoadedUBTMakefile);
}
/// <summary>
/// Saves a UBTMakefile to disk
/// </summary>
/// <param name="TargetDescs">List of targets. Order is not important</param>
/// <param name="HotReload">The hot reload state</param>
/// <param name="UBTMakefile">The UBT makefile</param>
public static void SaveUBTMakefile(List <TargetDescriptor> TargetDescs, EHotReload HotReload, UBTMakefile UBTMakefile)
{
if (!UBTMakefile.IsValidMakefile())
{
throw new BuildException("Can't save a makefile that has invalid contents. See UBTMakefile.IsValidMakefile()");
}
DateTime TimerStartTime = DateTime.UtcNow;
FileItem UBTMakefileItem = FileItem.GetItemByFileReference(GetUBTMakefilePath(TargetDescs, HotReload));
// @todo ubtmake: Optimization: The UBTMakefile saved for game projects is upwards of 9 MB. We should try to shrink its content if possible
// @todo ubtmake: Optimization: C# Serialization may be too slow for these big Makefiles. Loading these files often shows up as the slower part of the assembling phase.
// Serialize the cache to disk.
try
{
Directory.CreateDirectory(Path.GetDirectoryName(UBTMakefileItem.AbsolutePath));
using (FileStream Stream = new FileStream(UBTMakefileItem.AbsolutePath, FileMode.Create, FileAccess.Write))
{
BinaryFormatter Formatter = new BinaryFormatter();
Formatter.Serialize(Stream, UBTMakefile);
}
}
catch (Exception Ex)
{
Log.TraceError("Failed to write makefile: {0}", Ex.Message);
}
if (UnrealBuildTool.bPrintPerformanceInfo)
{
TimeSpan TimerDuration = DateTime.UtcNow - TimerStartTime;
Log.TraceInformation("Saving makefile took " + TimerDuration.TotalSeconds + "s");
}
}