/// <summary>
/// Determine what needs to be built for a target
/// </summary>
/// <param name="BuildConfiguration">The build configuration</param>
/// <param name="TargetDescriptor">Target being built</param>
/// <param name="Makefile">Makefile generated for this target</param>
/// <returns>Set of actions to execute</returns>
static HashSet <Action> GetActionsForTarget(BuildConfiguration BuildConfiguration, TargetDescriptor TargetDescriptor, TargetMakefile Makefile)
{
// Create the action graph
ActionGraph.Link(Makefile.Actions);
// Get the hot-reload mode
HotReloadMode HotReloadMode = TargetDescriptor.HotReloadMode;
if (HotReloadMode == HotReloadMode.Default)
{
if (TargetDescriptor.HotReloadModuleNameToSuffix.Count > 0 && TargetDescriptor.ForeignPlugin == null)
{
HotReloadMode = HotReloadMode.FromEditor;
}
else if (BuildConfiguration.bAllowHotReloadFromIDE && HotReload.ShouldDoHotReloadFromIDE(BuildConfiguration, TargetDescriptor))
{
HotReloadMode = HotReloadMode.FromIDE;
}
else
{
HotReloadMode = HotReloadMode.Disabled;
}
}
// Get the root prerequisite actions
List <Action> PrerequisiteActions = GatherPrerequisiteActions(TargetDescriptor, Makefile);
// Get the path to the hot reload state file for this target
FileReference HotReloadStateFile = global::UnrealBuildTool.HotReloadState.GetLocation(TargetDescriptor.ProjectFile, TargetDescriptor.Name, TargetDescriptor.Platform, TargetDescriptor.Configuration, TargetDescriptor.Architecture);
// Apply the previous hot reload state
HotReloadState HotReloadState = null;
if (HotReloadMode == HotReloadMode.Disabled)
{
// Make sure we're not doing a partial build from the editor (eg. compiling a new plugin)
if (TargetDescriptor.ForeignPlugin == null && TargetDescriptor.SingleFileToCompile == null)
{
// Delete the previous state file
HotReload.DeleteTemporaryFiles(HotReloadStateFile);
}
}
else
{
// Read the previous state file and apply it to the action graph
if (FileReference.Exists(HotReloadStateFile))
{
HotReloadState = HotReloadState.Load(HotReloadStateFile);
}
else
{
HotReloadState = new HotReloadState();
}
// Apply the old state to the makefile
HotReload.ApplyState(HotReloadState, Makefile);
// If we want a specific suffix on any modules, apply that now. We'll track the outputs later, but the suffix has to be forced (and is always out of date if it doesn't exist).
HotReload.PatchActionGraphWithNames(PrerequisiteActions, TargetDescriptor.HotReloadModuleNameToSuffix, Makefile);
// Re-link the action graph
ActionGraph.Link(PrerequisiteActions);
}
// Create the dependencies cache
CppDependencyCache CppDependencies;
using (Timeline.ScopeEvent("Reading dependency cache"))
{
CppDependencies = CppDependencyCache.CreateHierarchy(TargetDescriptor.ProjectFile, TargetDescriptor.Name, TargetDescriptor.Platform, TargetDescriptor.Configuration, Makefile.TargetType);
}
// Create the action history
ActionHistory History;
using (Timeline.ScopeEvent("Reading action history"))
{
History = ActionHistory.CreateHierarchy(TargetDescriptor.ProjectFile, TargetDescriptor.Name, TargetDescriptor.Platform, Makefile.TargetType);
}
// Plan the actions to execute for the build. For single file compiles, always rebuild the source file regardless of whether it's out of date.
HashSet <Action> TargetActionsToExecute;
if (TargetDescriptor.SingleFileToCompile == null)
{
TargetActionsToExecute = ActionGraph.GetActionsToExecute(Makefile.Actions, PrerequisiteActions, CppDependencies, History, BuildConfiguration.bIgnoreOutdatedImportLibraries);
}
else
{
TargetActionsToExecute = new HashSet <Action>(PrerequisiteActions);
}
// Additional processing for hot reload
if (HotReloadMode == HotReloadMode.LiveCoding)
{
// Filter the prerequisite actions down to just the compile actions, then recompute all the actions to execute
PrerequisiteActions = new List <Action>(TargetActionsToExecute.Where(x => x.ActionType == ActionType.Compile));
TargetActionsToExecute = ActionGraph.GetActionsToExecute(Makefile.Actions, PrerequisiteActions, CppDependencies, History, BuildConfiguration.bIgnoreOutdatedImportLibraries);
}
else if (HotReloadMode == HotReloadMode.FromEditor || HotReloadMode == HotReloadMode.FromIDE)
{
// Patch action history for hot reload when running in assembler mode. In assembler mode, the suffix on the output file will be
// the same for every invocation on that makefile, but we need a new suffix each time.
// For all the hot-reloadable modules that may need a unique suffix appended, build a mapping from output item to all the output items in that module. We can't
// apply a suffix to one without applying a suffix to all of them.
Dictionary <FileItem, FileItem[]> HotReloadItemToDependentItems = new Dictionary <FileItem, FileItem[]>();
foreach (string HotReloadModuleName in Makefile.HotReloadModuleNames)
{
int ModuleSuffix;
if (!TargetDescriptor.HotReloadModuleNameToSuffix.TryGetValue(HotReloadModuleName, out ModuleSuffix) || ModuleSuffix == -1)
{
FileItem[] ModuleOutputItems;
if (Makefile.ModuleNameToOutputItems.TryGetValue(HotReloadModuleName, out ModuleOutputItems))
{
foreach (FileItem ModuleOutputItem in ModuleOutputItems)
{
HotReloadItemToDependentItems[ModuleOutputItem] = ModuleOutputItems;
}
}
}
}
// Expand the list of actions to execute to include everything that references any files with a new suffix. Unlike a regular build, we can't ignore
// dependencies on import libraries under the assumption that a header would change if the API changes, because the dependency will be on a different DLL.
HashSet <FileItem> FilesRequiringSuffix = new HashSet <FileItem>(TargetActionsToExecute.SelectMany(x => x.ProducedItems).Where(x => HotReloadItemToDependentItems.ContainsKey(x)));
for (int LastNumFilesWithNewSuffix = 0; FilesRequiringSuffix.Count > LastNumFilesWithNewSuffix;)
{
LastNumFilesWithNewSuffix = FilesRequiringSuffix.Count;
foreach (Action PrerequisiteAction in PrerequisiteActions)
{
if (!TargetActionsToExecute.Contains(PrerequisiteAction))
{
foreach (FileItem ProducedItem in PrerequisiteAction.ProducedItems)
{
FileItem[] DependentItems;
if (HotReloadItemToDependentItems.TryGetValue(ProducedItem, out DependentItems))
{
TargetActionsToExecute.Add(PrerequisiteAction);
FilesRequiringSuffix.UnionWith(DependentItems);
}
}
}
}
}
// Build a list of file mappings
Dictionary <FileReference, FileReference> OldLocationToNewLocation = new Dictionary <FileReference, FileReference>();
foreach (FileItem FileRequiringSuffix in FilesRequiringSuffix)
{
FileReference OldLocation = FileRequiringSuffix.Location;
FileReference NewLocation = HotReload.ReplaceSuffix(OldLocation, HotReloadState.NextSuffix);
OldLocationToNewLocation[OldLocation] = NewLocation;
}
// Update the action graph with these new paths
HotReload.PatchActionGraph(PrerequisiteActions, OldLocationToNewLocation);
// Get a new list of actions to execute now that the graph has been modified
TargetActionsToExecute = ActionGraph.GetActionsToExecute(Makefile.Actions, PrerequisiteActions, CppDependencies, History, BuildConfiguration.bIgnoreOutdatedImportLibraries);
// Build a mapping of all file items to their original
Dictionary <FileReference, FileReference> HotReloadFileToOriginalFile = new Dictionary <FileReference, FileReference>();
foreach (KeyValuePair <FileReference, FileReference> Pair in HotReloadState.OriginalFileToHotReloadFile)
{
HotReloadFileToOriginalFile[Pair.Value] = Pair.Key;
}
foreach (KeyValuePair <FileReference, FileReference> Pair in OldLocationToNewLocation)
{
FileReference OriginalLocation;
if (!HotReloadFileToOriginalFile.TryGetValue(Pair.Key, out OriginalLocation))
{
OriginalLocation = Pair.Key;
}
HotReloadFileToOriginalFile[Pair.Value] = OriginalLocation;
}
// Now filter out all the hot reload files and update the state
foreach (Action Action in TargetActionsToExecute)
{
foreach (FileItem ProducedItem in Action.ProducedItems)
{
FileReference OriginalLocation;
if (HotReloadFileToOriginalFile.TryGetValue(ProducedItem.Location, out OriginalLocation))
{
HotReloadState.OriginalFileToHotReloadFile[OriginalLocation] = ProducedItem.Location;
HotReloadState.TemporaryFiles.Add(ProducedItem.Location);
}
}
}
// Increment the suffix for the next iteration
if (TargetActionsToExecute.Count > 0)
{
HotReloadState.NextSuffix++;
}
// Save the new state
HotReloadState.Save(HotReloadStateFile);
// Prevent this target from deploying
Makefile.bDeployAfterCompile = false;
}
return(TargetActionsToExecute);
}
