Application Startup
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Under Review
This tutorial or guide is currently undergoing review and should not be considered ready to use.
This guide explains the application startup sequence of RimWorld. This can be used to reference the order in which data is loaded in order to diagnose issues with mod code running too early or too late.
Application Load
The root method that begins the application load process is Verse.PlayDataLoader.LoadAllPlayData(bool), which is called by Verse.Root.Start().
| # | Description | Code Location |
|---|---|---|
| 1 | Load mod config data (the list of active mod) | Verse.ModsConfig constructor |
| 2 | Build mod list from mod folders | Verse.ModLister.RebuildModList(); |
| 3 | Initialize mods | Verse.LoadedModManager.InitializeMods() |
| 4 | Load mod assemblies (also create Mod subclass instances) (also queues up loading for audio, graphics, strings, and asset bundles, which doesn't execute until steps 30-33) | Verse.LoadedModManager.LoadModContent() Verse.LoadedModManager.CreateModClasses() |
| 5 | Load and parse Def XML files | Verse.LoadedModManager.LoadModXML() |
| 6 | Combine all the Def files into a single XML document | Verse.LoadedModManager.CombineIntoUnifiedXML() |
| 7 | Load translation keys from Defs (very rarely used) | Verse.TKeySystem.Parse() |
| 8 | Load and error check patches | Verse.LoadedModManager.ErrorCheckPatches() |
| 9 | Apply XML PatchOperations | Verse.LoadedModManager.ApplyPatches() |
| 10 | Register Def inheritance (Name and ParentName) | Verse.XmlInheritance.TryRegister() |
| 11 | Apply Def inheritance | Verse.LoadedModManager.ParseAndProcessXML() |
| 12 | Load Defs from XML into Def classes. References to other Defs are registered and not resolved until step 20 | Verse.LoadedModManager.ParseAndProcessXML() |
| 13 | Warn if any patches failed | Verse.LoadedModManager.ClearCachedPatches() |
| 14 | Load Language metadata | Verse.LanguageDatabase.InitAllMetadata() |
| 15 | Store Defs into DefDatabase
|
Verse.GenGeneric.InvokeStaticMethodOnGenericType() -> AddAllInMods |
| 16 | Store Defs into DefOf classes
|
RimWorld.DefOfHelper.RebindAllDefOfs(true) |
| 17 | Build translation key mappings | Verse.TKeySystem.BuildMappings() |
| 18 | Inject DefInjected translations (first round) | Verse.LanguageDatabase.activeLanguage.InjectIntoData_BeforeImpliedDefs() |
| 19 | Generate implied defs (Blueprints, Meat, Frames, Techprints, Corpses, Stone terrain, Recipes from recipeMakers, Neurotrainers) | Verse.DefGenerator.GenerateImpliedDefs_PreResolve(); |
| 20 | Resolve cross references (goes through cross-reference registrations and replace them with direct references to their actual Defs | Verse.DirectXmlCrossRefLoader.ResolveAllWantedCrossReferences() |
| 21 | Store Defs into DefOf fields (again, will error if Def is not found this time)
|
RimWorld.DefOfHelper.RebindAllDefOfs(false) |
| 22 | Reload player knowledge database (Learning Helper entries) | RimWorld.PlayerKnowledgeDatabase.ReloadAndRebind() RimWorld.LessonAutoActivator.Reset(); |
| 23 | Reset all static data | Verse.LoadedModManager.DoPlayLoad() |
| 24 | Resolve references (calls ResolveReferences on all Defs), specifically in order: ThingCategoryDefs, RecipeDefs, all other defs, ThingDefs | Verse.DefDatabase<ThingCategoryDef>.ResolveAllReferences(true, true) Verse.DefDatabase<RecipeDef>.ResolveAllReferences(true, true) Verse.GenGeneric.InvokeStaticMethodOnGenericType() -> ResolveAllReferences Verse.DefDatabase<ThingDef>.ResolveAllReferences() |
| 25 | Generate implied defs (Key bindings) | RimWorld.DefGenerator.GenerateImpliedDefs_PostResolve() |
| 26 | Reset more static data, and make sure smoothing is set up properly | Verse.LoadedModManager.DoPlayLoad() |
| 27 | If in Dev mode, log all config errors | Verse.GenGeneric.InvokeStaticMethodOnGenericType() -> ErrorCheckAllDefs |
| 28 | Load KeyBindings | Verse.KeyPrefs.Init() |
| 29 | Assign short hashes | Verse.ShortHashGiver.GiveAllShortHashes() |
| 30 | Load audio files from mods | Verse.LoadedModManager.LoadModContent() -> Verse.ModContentPack.ReloadContent() -> VerseModContentPack.ReloadContentInt() |
| 31 | Load textures from mods | Verse.LoadedModManager.LoadModContent() -> Verse.ModContentPack.ReloadContent() -> VerseModContentPack.ReloadContentInt() |
| 32 | Load strings from mods | Verse.LoadedModManager.LoadModContent() -> Verse.ModContentPack.ReloadContent() -> VerseModContentPack.ReloadContentInt() |
| 33 | Load asset bundles from mods | Verse.LoadedModManager.LoadModContent() -> Verse.ModContentPack.ReloadContent() -> VerseModContentPack.ReloadContentInt() |
| 34 | Load PawnBios (backer pawns and name-in-game lists) | RimWorld.SolidBioDatabase.LoadAllBios() |
| 35 | Inject DefInjected translations, including in backstories, and error if there's a translation for a Def that isn't present | Verse.LanguageDatabase.activeLanguage.InjectIntoData_AfterImpliedDefs() |
| 36 | Call all StaticConstructorOnStartup classes
|
Verse.StaticConstructorOnStartupUtility.CallAll() |
| 37 | Bake static atlases (building damage and minified overlays such as the crate and bag textures) | Verse.GlobalTextureAtlasManager.BakeStaticAtlases() |
| 38 | Force garbage collection | RimWorld.IO.AbstractFilesystem.ClearAllCache() System.GC.Collect(int.MaxValue, GCCollectionMode.Forced) |
Sources
The data in this guide was compiled using and cross-referenced with the writeup on Discord by legodude17.