- split DObject::Destroy into the main method, a native OnDestroy and a scripted OnDestroy method and made the main method non-virtual

This was done to ensure it can be properly overridden in scripts without causing problems when called during engine shutdown for the type and symbol objects the VM needs to work and to have the scripted version always run first.
Since the scripted OnDestroy method never calls the native version - the native one is run after the scripted one - this can be simply skipped over during shutdown.

src/actor.h

@@ -595,7 +595,7 @@ public:
 	AActor &operator= (const AActor &other);
 	~AActor ();
 
-	virtual void Destroy() override;
+	virtual void OnDestroy() override;
 	virtual void Serialize(FSerializer &arc) override;
 	virtual void PostSerialize() override;
 	virtual void PostBeginPlay() override;		// Called immediately before the actor's first tick

src/d_dehacked.cpp

@@ -3199,14 +3199,14 @@ void ADehackedPickup::DoPickupSpecial (AActor *toucher)
 	RealPickup = nullptr;
 }
 
-void ADehackedPickup::Destroy ()
+void ADehackedPickup::OnDestroy ()
 {
 	if (RealPickup != nullptr)
 	{
 		RealPickup->Destroy ();
 		RealPickup = nullptr;
 	}
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 PClassActor *ADehackedPickup::DetermineType ()

src/d_dehacked.h

@@ -41,7 +41,7 @@ class ADehackedPickup : public AInventory
 	DECLARE_CLASS (ADehackedPickup, AInventory)
 	HAS_OBJECT_POINTERS
 public:
-	void Destroy() override;
+	void OnDestroy() override;
 	FString PickupMessage ();
 	bool ShouldRespawn ();
 	bool ShouldStay ();

src/d_main.cpp

@@ -2715,7 +2715,6 @@ void D_DoomMain (void)
 			*(afunc->VMPointer) = NULL;
 		}
 
-		ReleaseGlobalSymbols();
 		PClass::StaticShutdown();
 
 		GC::FullGC();					// perform one final garbage collection after shutdown
@@ -2727,6 +2726,7 @@ void D_DoomMain (void)
 
 		restart++;
 		PClass::bShutdown = false;
+		PClass::bShuttingDown = false;
 	}
 	while (1);
 }

src/dobject.cpp

@@ -351,8 +351,18 @@ DObject::~DObject ()
 //
 //==========================================================================
 
-void DObject::Destroy ()
+void DObject:: Destroy ()
 {
+	// We cannot call the VM during shutdown because all the needed data has been or is in the process of being deleted.
+	if (!PClass::bShuttingDown)
+	{
+		IFVIRTUAL(DObject, OnDestroy)
+		{
+			VMValue params[1] = { (DObject*)this };
+			GlobalVMStack.Call(func, params, 1, nullptr, 0);
+		}
+	}
+	OnDestroy();
 	ObjectFlags = (ObjectFlags & ~OF_Fixed) | OF_EuthanizeMe;
 }
 

src/dobject.h

@@ -473,7 +473,8 @@ public:
 	// that don't call their base class.
 	void CheckIfSerialized () const;
 
-	virtual void Destroy();
+	virtual void OnDestroy() {}
+	void Destroy();
 
 	// If you need to replace one object with another and want to
 	// change any pointers from the old object to the new object,

src/dobjtype.cpp

@@ -72,6 +72,7 @@ FTypeTable TypeTable;
 PSymbolTable GlobalSymbols;
 TArray<PClass *> PClass::AllClasses;
 bool PClass::bShutdown;
+bool PClass::bShuttingDown;
 
 PErrorType *TypeError;
 PErrorType *TypeAuto;
@@ -534,16 +535,9 @@ const char *PType::DescriptiveName() const
 //
 //==========================================================================
 
-void ReleaseGlobalSymbols()
-{
-	TypeTable.Clear();
-	GlobalSymbols.ReleaseSymbols();
-}
-
 void PType::StaticInit()
 {
 	// Add types to the global symbol table.
-	atterm(ReleaseGlobalSymbols);
 
 	// Set up TypeTable hash keys.
 	RUNTIME_CLASS(PErrorType)->TypeTableType = RUNTIME_CLASS(PErrorType);
@@ -2962,7 +2956,18 @@ void PClass::StaticShutdown ()
 	TArray<size_t *> uniqueFPs(64);
 	unsigned int i, j;
 
-	FS_Close();	// this must be done before the classes get deleted.
+
+	// Make a full garbage collection here so that all destroyed but uncollected higher level objects that still exist can be properly taken down.
+	GC::FullGC();
+
+	// From this point onward no scripts may be called anymore because the data needed by the VM is getting deleted now.
+	// This flags DObject::Destroy not to call any scripted OnDestroy methods anymore.
+	bShuttingDown = true;
+
+	// Unless something went wrong, anything left here should be class and type objects only, which do not own any scripts.
+	TypeTable.Clear();
+	GlobalSymbols.ReleaseSymbols();
+
 	for (i = 0; i < PClass::AllClasses.Size(); ++i)
 	{
 		PClass *type = PClass::AllClasses[i];
@@ -2989,7 +2994,6 @@ void PClass::StaticShutdown ()
 	{
 		delete[] uniqueFPs[i];
 	}
-	TypeTable.Clear();
 	bShutdown = true;
 
 	AllClasses.Clear();

src/dobjtype.h

@@ -883,6 +883,7 @@ public:
 	static TArray<PClass *> AllClasses;
 
 	static bool bShutdown;
+	static bool bShuttingDown;
 };
 
 class PClassType : public PClass
@@ -1015,8 +1016,6 @@ public:
 	PSymbolConstString() {}
 };
 
-void ReleaseGlobalSymbols();
-
 // Enumerations for serializing types in an archive -------------------------
 
 enum ETypeVal : BYTE

src/dsectoreffect.cpp

@@ -39,7 +39,7 @@ DSectorEffect::DSectorEffect ()
 	m_Sector = NULL;
 }
 
-void DSectorEffect::Destroy()
+void DSectorEffect::OnDestroy()
 {
 	if (m_Sector)
 	{
@@ -56,7 +56,7 @@ void DSectorEffect::Destroy()
 			m_Sector->lightingdata = NULL;
 		}
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 DSectorEffect::DSectorEffect (sector_t *sector)
@@ -87,10 +87,10 @@ DMover::DMover (sector_t *sector)
 	interpolation = NULL;
 }
 
-void DMover::Destroy()
+void DMover::OnDestroy()
 {
 	StopInterpolation();
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 void DMover::Serialize(FSerializer &arc)

src/dsectoreffect.h

@@ -12,7 +12,7 @@ public:
 
 	
 	void Serialize(FSerializer &arc);
-	void Destroy() override;
+	void OnDestroy() override;
 
 	sector_t *GetSector() const { return m_Sector; }
 
@@ -35,7 +35,7 @@ protected:
 	DMover ();
 	
 	void Serialize(FSerializer &arc);
-	void Destroy() override;
+	void OnDestroy() override;
 };
 
 class DMovingFloor : public DMover

src/dthinker.cpp

@@ -253,7 +253,7 @@ DThinker::~DThinker ()
 	assert(NextThinker == NULL && PrevThinker == NULL);
 }
 
-void DThinker::Destroy ()
+void DThinker::OnDestroy ()
 {
 	assert((NextThinker != NULL && PrevThinker != NULL) ||
 		   (NextThinker == NULL && PrevThinker == NULL));
@@ -261,7 +261,7 @@ void DThinker::Destroy ()
 	{
 		Remove();
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/dthinker.h

@@ -66,7 +66,7 @@ class DThinker : public DObject
 	DECLARE_CLASS (DThinker, DObject)
 public:
 	DThinker (int statnum = STAT_DEFAULT) throw();
-	void Destroy () override;
+	void OnDestroy () override;
 	virtual ~DThinker ();
 	virtual void Tick ();
 	void CallTick();

src/fragglescript/t_func.cpp

@@ -1786,7 +1786,7 @@ public:
 	DLightLevel(sector_t * s,int destlevel,int speed);
 	void	Serialize(FSerializer &arc);
 	void		Tick ();
-	void		Destroy() { Super::Destroy(); m_Sector->lightingdata=NULL; }
+	void		OnDestroy() { Super::OnDestroy(); m_Sector->lightingdata = nullptr; }
 };
 
 IMPLEMENT_CLASS(DLightLevel, false, false)

src/fragglescript/t_script.cpp

@@ -184,7 +184,7 @@ DFsScript::~DFsScript()
 //
 //==========================================================================
 
-void DFsScript::Destroy()
+void DFsScript::OnDestroy()
 {
 	ClearVariables(true);
 	ClearSections();
@@ -194,7 +194,7 @@ void DFsScript::Destroy()
 	data = NULL;
 	parent = NULL;
 	trigger = NULL;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -334,7 +334,7 @@ DRunningScript::DRunningScript(AActor *trigger, DFsScript *owner, int index)
 //
 //==========================================================================
 
-void DRunningScript::Destroy()
+void DRunningScript::OnDestroy()
 {
 	int i;
 	DFsVariable *current, *next;
@@ -352,7 +352,7 @@ void DRunningScript::Destroy()
 		}
 		variables[i] = NULL;
     }
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -421,7 +421,7 @@ DFraggleThinker::DFraggleThinker()
 //
 //==========================================================================
 
-void DFraggleThinker::Destroy()
+void DFraggleThinker::OnDestroy()
 {
 	DRunningScript *p = RunningScripts;
 	while (p)
@@ -438,7 +438,7 @@ void DFraggleThinker::Destroy()
 
 	SpawnedThings.Clear();
 	ActiveThinker = NULL;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/fragglescript/t_script.h

@@ -347,7 +347,7 @@ public:
 
 	DFsScript();
 	~DFsScript();
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &ar);
 
 	DFsVariable *NewVariable(const char *name, int vtype);
@@ -662,7 +662,7 @@ class DRunningScript : public DObject
 
 public:
 	DRunningScript(AActor *trigger=NULL, DFsScript *owner = NULL, int index = 0) ;
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 
 	TObjPtr<DFsScript> script;
@@ -697,7 +697,7 @@ public:
 	bool nocheckposition;
 
 	DFraggleThinker();
-	void Destroy() override;
+	void OnDestroy() override;
 
 
 	void Serialize(FSerializer & arc);

src/g_inventory/a_artifacts.cpp

@@ -292,10 +292,10 @@ void APowerup::CallEndEffect()
 //
 //===========================================================================
 
-void APowerup::Destroy ()
+void APowerup::OnDestroy ()
 {
 	CallEndEffect ();
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 //===========================================================================

src/g_inventory/a_artifacts.h

@@ -12,7 +12,7 @@ class APowerup : public AInventory
 	DECLARE_CLASS (APowerup, AInventory)
 public:
 	virtual void Tick () override;
-	virtual void Destroy () override;
+	virtual void OnDestroy() override;
 	virtual bool HandlePickup (AInventory *item) override;
 	virtual AInventory *CreateCopy (AActor *other) override;
 	virtual AInventory *CreateTossable () override;

src/g_inventory/a_pickups.cpp

@@ -1137,14 +1137,14 @@ bool AInventory::CallShouldStay()
 //
 //===========================================================================
 
-void AInventory::Destroy ()
+void AInventory::OnDestroy ()
 {
 	if (Owner != NULL)
 	{
 		Owner->RemoveInventory (this);
 	}
 	Inventory = NULL;
-	Super::Destroy ();
+	Super::OnDestroy();
 
 	// Although contrived it can theoretically happen that these variables still got a pointer to this item
 	if (SendItemUse == this) SendItemUse = NULL;

src/g_inventory/a_pickups.h

@@ -76,7 +76,7 @@ public:
 	virtual void Serialize(FSerializer &arc) override;
 	virtual void MarkPrecacheSounds() const override;
 	virtual void BeginPlay () override;
-	virtual void Destroy () override;
+	virtual void OnDestroy() override;
 	virtual void Tick() override;
 	virtual bool Grind(bool items) override;
 

src/g_inventory/a_weapons.cpp

@@ -329,7 +329,7 @@ bool AWeapon::Use (bool pickup)
 //
 //===========================================================================
 
-void AWeapon::Destroy()
+void AWeapon::OnDestroy()
 {
 	AWeapon *sister = SisterWeapon;
 
@@ -342,7 +342,7 @@ void AWeapon::Destroy()
 			sister->Destroy();
 		}
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //===========================================================================

src/g_inventory/a_weapons.h

@@ -145,7 +145,7 @@ public:
 	virtual bool TryPickup (AActor *&toucher) override;
 	virtual bool TryPickupRestricted (AActor *&toucher) override;
 	virtual bool Use (bool pickup) override;
-	virtual void Destroy() override;
+	virtual void OnDestroy() override;
 
 	bool PickupForAmmo(AWeapon *ownedWeapon);
 	void PostMorphWeapon();

src/g_shared/a_action.cpp

@@ -219,7 +219,7 @@ class DCorpsePointer : public DThinker
 	HAS_OBJECT_POINTERS
 public:
 	DCorpsePointer (AActor *ptr);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	TObjPtr<AActor> Corpse;
 	DWORD Count;	// Only the first corpse pointer's count is valid.
@@ -271,7 +271,7 @@ DCorpsePointer::DCorpsePointer (AActor *ptr)
 	++first->Count;
 }
 
-void DCorpsePointer::Destroy ()
+void DCorpsePointer::OnDestroy ()
 {
 	// Store the count of corpses in the first thinker in the list
 	TThinkerIterator<DCorpsePointer> iterator (STAT_CORPSEPOINTER);
@@ -293,7 +293,7 @@ void DCorpsePointer::Destroy ()
 	{
 		Corpse->Destroy ();
 	}
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 void DCorpsePointer::Serialize(FSerializer &arc)

src/g_shared/a_bridge.cpp

@@ -8,12 +8,12 @@ class ACustomBridge : public AActor
 {
 	DECLARE_CLASS (ACustomBridge, AActor)
 public:
-	void Destroy() override;
+	void OnDestroy() override;
 };
 
 IMPLEMENT_CLASS(ACustomBridge, false, false)
 
-void ACustomBridge::Destroy()
+void ACustomBridge::OnDestroy()
 {
 	// Hexen originally just set a flag to make the bridge balls remove themselves in A_BridgeOrbit.
 	// But this is not safe with custom bridge balls that do not necessarily call that function.
@@ -29,5 +29,5 @@ void ACustomBridge::Destroy()
 			thing->Destroy();
 		}
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }

src/g_shared/a_decals.cpp

@@ -111,10 +111,10 @@ DBaseDecal::DBaseDecal (const DBaseDecal *basis)
 {
 }
 
-void DBaseDecal::Destroy ()
+void DBaseDecal::OnDestroy ()
 {
 	Remove ();
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 void DBaseDecal::Remove ()
@@ -670,10 +670,10 @@ DBaseDecal *DImpactDecal::CloneSelf (const FDecalTemplate *tpl, double ix, doubl
 	return decal;
 }
 
-void DImpactDecal::Destroy ()
+void DImpactDecal::OnDestroy ()
 {
 	ImpactCount--;
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 CCMD (countdecals)

src/g_shared/a_flashfader.cpp

@@ -23,10 +23,10 @@ DFlashFader::DFlashFader (float r1, float g1, float b1, float a1,
 	Blends[1][0]=r2; Blends[1][1]=g2; Blends[1][2]=b2; Blends[1][3]=a2;
 }
 
-void DFlashFader::Destroy ()
+void DFlashFader::OnDestroy ()
 {
 	SetBlend (1.f);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 void DFlashFader::Serialize(FSerializer &arc)

src/g_shared/a_morph.cpp

@@ -690,13 +690,13 @@ void AMorphedMonster::Serialize(FSerializer &arc)
 		("flagsave", FlagsSave);
 }
 
-void AMorphedMonster::Destroy ()
+void AMorphedMonster::OnDestroy ()
 {
 	if (UnmorphedMe != NULL)
 	{
 		UnmorphedMe->Destroy ();
 	}
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 void AMorphedMonster::Die (AActor *source, AActor *inflictor, int dmgflags)

src/g_shared/a_sectoraction.cpp

@@ -47,7 +47,7 @@ bool ASectorAction::IsActivatedByUse() const
 	return ActivatedByUse;
 }
 
-void ASectorAction::Destroy ()
+void ASectorAction::OnDestroy ()
 {
 	if (Sector != nullptr)
 	{
@@ -72,7 +72,7 @@ void ASectorAction::Destroy ()
 		Sector = nullptr;
 	}
 
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 void ASectorAction::BeginPlay ()

src/g_shared/a_sharedglobal.h

@@ -24,7 +24,7 @@ public:
 	DBaseDecal (const DBaseDecal *basis);
 
 	void Serialize(FSerializer &arc);
-	void Destroy() override;
+	void OnDestroy() override;
 	FTextureID StickToWall(side_t *wall, double x, double y, F3DFloor * ffloor);
 	double GetRealZ (const side_t *wall) const;
 	void SetShade (DWORD rgb);
@@ -66,7 +66,7 @@ public:
 	static DImpactDecal *StaticCreate(const FDecalTemplate *tpl, const DVector3 &pos, side_t *wall, F3DFloor * ffloor, PalEntry color = 0);
 
 	void BeginPlay ();
-	void Destroy() override;
+	void OnDestroy() override;
 
 protected:
 	DBaseDecal *CloneSelf(const FDecalTemplate *tpl, double x, double y, double z, side_t *wall, F3DFloor * ffloor) const;
@@ -88,7 +88,7 @@ class ASkyViewpoint : public AActor
 	DECLARE_CLASS (ASkyViewpoint, AActor)
 public:
 	void BeginPlay ();
-	void Destroy() override;
+	void OnDestroy() override;
 };
 
 // For an EE compatible linedef based definition.
@@ -116,7 +116,7 @@ public:
 	DFlashFader (float r1, float g1, float b1, float a1,
 				 float r2, float g2, float b2, float a2,
 				 float time, AActor *who);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	void Tick ();
 	AActor *WhoFor() { return ForWho; }
@@ -207,7 +207,7 @@ public:
 	
 	void Serialize(FSerializer &arc);
 	void Die (AActor *source, AActor *inflictor, int dmgflags);
-	void Destroy() override;
+	void OnDestroy() override;
 
 	TObjPtr<AActor> UnmorphedMe;
 	int UnmorphTime, MorphStyle;

src/g_shared/a_skies.cpp

@@ -56,7 +56,7 @@ void ASkyViewpoint::BeginPlay ()
 	}
 }
 
-void ASkyViewpoint::Destroy ()
+void ASkyViewpoint::OnDestroy ()
 {
 	// remove all sector references to ourselves.
 	for (auto &s : sectorPortals)
@@ -70,7 +70,7 @@ void ASkyViewpoint::Destroy ()
 		}
 	}
 
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 IMPLEMENT_CLASS(ASkyCamCompat, false, false)
@@ -157,7 +157,7 @@ class ASectorSilencer : public AActor
 	DECLARE_CLASS (ASectorSilencer, AActor)
 public:
 	void BeginPlay ();
-	void Destroy() override;
+	void OnDestroy() override;
 };
 
 IMPLEMENT_CLASS(ASectorSilencer, false, false)
@@ -168,12 +168,12 @@ void ASectorSilencer::BeginPlay ()
 	Sector->Flags |= SECF_SILENT;
 }
 
-void ASectorSilencer::Destroy ()
+void ASectorSilencer::OnDestroy ()
 {
 	if (Sector != nullptr)
 	{
 		Sector->Flags &= ~SECF_SILENT;
 	}
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 

src/g_shared/a_soundsequence.cpp

@@ -104,7 +104,7 @@ class ASoundSequence : public AActor
 {
 	DECLARE_CLASS (ASoundSequence, AActor)
 public:
-	void Destroy() override;
+	void OnDestroy() override;
 	void PostBeginPlay ();
 	void Activate (AActor *activator);
 	void Deactivate (AActor *activator);
@@ -119,10 +119,10 @@ IMPLEMENT_CLASS(ASoundSequence, false, false)
 //
 //==========================================================================
 
-void ASoundSequence::Destroy ()
+void ASoundSequence::OnDestroy ()
 {
 	SN_StopSequence (this);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/g_shared/a_specialspot.cpp

@@ -220,13 +220,13 @@ DSpotState::DSpotState ()
 //
 //----------------------------------------------------------------------------
 
-void DSpotState::Destroy ()
+void DSpotState::OnDestroy ()
 {
 	SpotLists.Clear();
 	SpotLists.ShrinkToFit();
 
 	SpotState = NULL;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //----------------------------------------------------------------------------
@@ -389,11 +389,11 @@ void ASpecialSpot::BeginPlay()
 //
 //----------------------------------------------------------------------------
 
-void ASpecialSpot::Destroy()
+void ASpecialSpot::OnDestroy()
 {
 	DSpotState *state = DSpotState::GetSpotState(false);
 	if (state != NULL) state->RemoveSpot(this);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 // Mace spawn spot ----------------------------------------------------------

src/g_shared/a_specialspot.h

@@ -11,7 +11,7 @@ class ASpecialSpot : public AActor
 public:
 
 	void BeginPlay();
-	void Destroy() override;
+	void OnDestroy() override;
 };
 
 
@@ -28,7 +28,7 @@ public:
 
 
 	DSpotState ();
-	void Destroy() override;
+	void OnDestroy() override;
 	void Tick ();
 	static DSpotState *GetSpotState(bool create = true);
 	FSpotList *FindSpotList(PClassActor *type);

src/g_shared/sbar.h

@@ -341,7 +341,7 @@ public:
 	};
 
 	DBaseStatusBar (int reltop, int hres=320, int vres=200);
-	void Destroy() override;
+	void OnDestroy() override;
 
 	void SetScaled (bool scale, bool force=false);
 

src/g_shared/shared_sbar.cpp

@@ -258,7 +258,7 @@ DBaseStatusBar::DBaseStatusBar (int reltop, int hres, int vres)
 //
 //---------------------------------------------------------------------------
 
-void DBaseStatusBar::Destroy ()
+void DBaseStatusBar::OnDestroy ()
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
@@ -271,7 +271,7 @@ void DBaseStatusBar::Destroy ()
 		}
 		Messages[i] = NULL;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //---------------------------------------------------------------------------

src/gl/dynlights/a_dynlight.cpp

@@ -805,10 +805,10 @@ void ADynamicLight::UnlinkLight ()
 	while (touching_sector) touching_sector = DeleteLightNode(touching_sector);
 }
 
-void ADynamicLight::Destroy()
+void ADynamicLight::OnDestroy()
 {
 	UnlinkLight();
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 

src/gl/dynlights/gl_dynlight.h

@@ -108,7 +108,7 @@ public:
 	void BeginPlay();
 	void SetOrigin (double x, double y, double z, bool moving = false);
 	void PostBeginPlay();
-	void Destroy();
+	void OnDestroy() override;
 	void Activate(AActor *activator);
 	void Deactivate(AActor *activator);
 	void SetOffset(const DVector3 &pos);

src/intermission/intermission.cpp

@@ -204,7 +204,7 @@ void DIntermissionScreen::Drawer ()
 	if (!mFlatfill) screen->FillBorder (NULL);
 }
 
-void DIntermissionScreen::Destroy()
+void DIntermissionScreen::OnDestroy()
 {
 	if (mPaletteChanged)
 	{
@@ -222,7 +222,7 @@ void DIntermissionScreen::Destroy()
 		M_EnableMenu(true);
 	}
 	S_StopSound(CHAN_VOICE);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -874,9 +874,9 @@ void DIntermissionController::Drawer ()
 	}
 }
 
-void DIntermissionController::Destroy ()
+void DIntermissionController::OnDestroy ()
 {
-	Super::Destroy();
+	Super::OnDestroy();
 	if (mScreen != NULL) mScreen->Destroy();
 	if (mDeleteDesc) delete mDesc;
 	mDesc = NULL;

src/intermission/intermission.h

@@ -176,7 +176,7 @@ public:
 	virtual int Responder (event_t *ev);
 	virtual int Ticker ();
 	virtual void Drawer ();
-	void Destroy() override;
+	void OnDestroy() override;
 	FTextureID GetBackground(bool *fill)
 	{
 		*fill = mFlatfill;
@@ -301,7 +301,7 @@ public:
 	bool Responder (event_t *ev);
 	void Ticker ();
 	void Drawer ();
-	void Destroy() override;
+	void OnDestroy() override;
 
 	friend void F_AdvanceIntermission();
 };

src/menu/colorpickermenu.cpp

@@ -95,7 +95,7 @@ public:
 		desc->CalcIndent();
 	}
 
-	void Destroy() override
+	void OnDestroy() override
 	{
 		if (mStartItem >= 0)
 		{

src/menu/loadsavemenu.cpp

@@ -103,7 +103,7 @@ protected:
 	char savegamestring[SAVESTRINGSIZE];
 
 	DLoadSaveMenu(DMenu *parent = NULL, FListMenuDescriptor *desc = NULL);
-	void Destroy() override;
+	void OnDestroy() override;
 
 	int RemoveSaveSlot (int index);
 	void UnloadSaveData ();
@@ -461,12 +461,12 @@ DLoadSaveMenu::DLoadSaveMenu(DMenu *parent, FListMenuDescriptor *desc)
 	commentBottom = commentTop + commentHeight;
 }
 
-void DLoadSaveMenu::Destroy()
+void DLoadSaveMenu::OnDestroy()
 {
 	if (currentSavePic != nullptr) delete currentSavePic;
 	currentSavePic = nullptr;
 	ClearSaveStuff ();
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //=============================================================================
@@ -928,7 +928,7 @@ class DSaveMenu : public DLoadSaveMenu
 public:
 
 	DSaveMenu(DMenu *parent = NULL, FListMenuDescriptor *desc = NULL);
-	void Destroy() override;
+	void OnDestroy() override;
 	void DoSave (FSaveGameNode *node);
 	bool Responder (event_t *ev);
 	bool MenuEvent (int mkey, bool fromcontroller);
@@ -968,7 +968,7 @@ DSaveMenu::DSaveMenu(DMenu *parent, FListMenuDescriptor *desc)
 //
 //=============================================================================
 
-void DSaveMenu::Destroy()
+void DSaveMenu::OnDestroy()
 {
 	if (SaveGames[0] == &NewSaveNode)
 	{
@@ -976,7 +976,7 @@ void DSaveMenu::Destroy()
 		if (Selected == 0) Selected = -1;
 		else Selected--;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //=============================================================================

src/menu/messagebox.cpp

@@ -63,7 +63,7 @@ class DMessageBoxMenu : public DMenu
 public:
 
 	DMessageBoxMenu(DMenu *parent = NULL, const char *message = NULL, int messagemode = 0, bool playsound = false, FName action = NAME_None);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Init(DMenu *parent, const char *message, int messagemode, bool playsound = false);
 	void Drawer();
 	bool Responder(event_t *ev);
@@ -124,11 +124,11 @@ void DMessageBoxMenu::Init(DMenu *parent, const char *message, int messagemode,
 //
 //=============================================================================
 
-void DMessageBoxMenu::Destroy()
+void DMessageBoxMenu::OnDestroy()
 {
 	if (mMessage != NULL) V_FreeBrokenLines(mMessage);
 	mMessage = NULL;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //=============================================================================

src/p_conversation.cpp

@@ -829,12 +829,12 @@ public:
 	//
 	//=============================================================================
 
-	void Destroy()
+	void OnDestroy() override
 	{
 		V_FreeBrokenLines(mDialogueLines);
 		mDialogueLines = NULL;
 		I_SetMusicVolume (1.f);
-		Super::Destroy();
+		Super::OnDestroy();
 	}
 
 	bool DimAllowed()

src/p_floor.cpp

@@ -869,7 +869,7 @@ void DElevator::Serialize(FSerializer &arc)
 //
 //==========================================================================
 
-void DElevator::Destroy()
+void DElevator::OnDestroy()
 {
 	if (m_Interp_Ceiling != NULL)
 	{
@@ -881,7 +881,7 @@ void DElevator::Destroy()
 		m_Interp_Floor->DelRef();
 		m_Interp_Floor = NULL;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/p_mobj.cpp

@@ -1770,7 +1770,7 @@ void P_ExplodeMissile (AActor *mo, line_t *line, AActor *target)
 		}
 	}
 
-	// play the sound before changing the state, so that AActor::Destroy can call S_RelinkSounds on it and the death state can override it.
+	// play the sound before changing the state, so that AActor::OnDestroy can call S_RelinkSounds on it and the death state can override it.
 	if (mo->DeathSound)
 	{
 		S_Sound (mo, CHAN_VOICE, mo->DeathSound, 1,
@@ -4920,7 +4920,7 @@ void AActor::CallDeactivate(AActor *activator)
 //
 //===========================================================================
 
-void AActor::Destroy ()
+void AActor::OnDestroy ()
 {
 	ClearRenderSectorList();
 	ClearRenderLineList();
@@ -4938,7 +4938,7 @@ void AActor::Destroy ()
 	// Transform any playing sound into positioned, non-actor sounds.
 	S_RelinkSound (this, NULL);
 
-	Super::Destroy ();
+	Super::OnDestroy();
 }
 
 //===========================================================================

src/p_pillar.cpp

@@ -52,7 +52,7 @@ DPillar::DPillar ()
 {
 }
 
-void DPillar::Destroy()
+void DPillar::OnDestroy()
 {
 	if (m_Interp_Ceiling != NULL)
 	{
@@ -64,7 +64,7 @@ void DPillar::Destroy()
 		m_Interp_Floor->DelRef();
 		m_Interp_Floor = NULL;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 void DPillar::Serialize(FSerializer &arc)

src/p_pspr.cpp

@@ -1665,7 +1665,7 @@ DEFINE_ACTION_FUNCTION(_PlayerInfo, SetSafeFlash)
 //
 //------------------------------------------------------------------------
 
-void DPSprite::Destroy()
+void DPSprite::OnDestroy()
 {
 	// Do not crash if this gets called on partially initialized objects.
 	if (Owner != nullptr && Owner->psprites != nullptr)
@@ -1688,7 +1688,7 @@ void DPSprite::Destroy()
 			GC::WriteBarrier(Next);
 		}
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //------------------------------------------------------------------------

src/p_pspr.h

@@ -75,6 +75,7 @@ public:
 	AActor*		GetCaller()	      { return Caller; }
 	void		SetCaller(AActor *newcaller) { Caller = newcaller; }
 	void		ResetInterpolation() { oldx = x; oldy = y; }
+	void OnDestroy() override;
 
 	double x, y;
 	double oldx, oldy;
@@ -87,7 +88,6 @@ private:
 
 	void Serialize(FSerializer &arc);
 	void Tick();
-	void Destroy() override;
 
 public:	// must be public to be able to generate the field export tables. Grrr...
 	TObjPtr<AActor> Caller;

src/p_scroll.cpp

@@ -45,7 +45,7 @@ public:
 	
 	DScroller (EScroll type, double dx, double dy, int control, int affectee, int accel, EScrollPos scrollpos = EScrollPos::scw_all);
 	DScroller (double dx, double dy, const line_t *l, int control, int accel, EScrollPos scrollpos = EScrollPos::scw_all);
-	void Destroy() override;
+	void OnDestroy() override;
 
 	void Serialize(FSerializer &arc);
 	void Tick ();
@@ -306,7 +306,7 @@ DScroller::DScroller (EScroll type, double dx, double dy,
 	}
 }
 
-void DScroller::Destroy ()
+void DScroller::OnDestroy ()
 {
 	for(int i=0;i<3;i++)
 	{
@@ -316,7 +316,7 @@ void DScroller::Destroy ()
 			m_Interpolations[i] = NULL;
 		}
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //-----------------------------------------------------------------------------

src/p_setup.cpp

@@ -4188,6 +4188,11 @@ static void P_Shutdown ()
 	P_FreeLevelData ();
 	P_FreeExtraLevelData ();
 	ST_Clear();
+	FS_Close();
+	for (auto &p : players)
+	{
+		if (p.psprites != nullptr) p.psprites->Destroy();
+	}
 }
 
 #if 0

src/p_spec.h

@@ -243,7 +243,7 @@ public:
 
 	void Serialize(FSerializer &arc);
 	void Tick ();
-	void Destroy() override;
+	void OnDestroy() override;
 
 protected:
 	EPillar		m_Type;
@@ -574,7 +574,7 @@ public:
 
 	DElevator (sector_t *sec);
 
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	void Tick ();
 

src/po_man.cpp

@@ -187,7 +187,7 @@ DPolyAction::DPolyAction (int polyNum)
 	SetInterpolation ();
 }
 
-void DPolyAction::Destroy()
+void DPolyAction::OnDestroy()
 {
 	FPolyObj *poly = PO_GetPolyobj (m_PolyObj);
 
@@ -197,7 +197,7 @@ void DPolyAction::Destroy()
 	}
 
 	StopInterpolation();
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 void DPolyAction::Stop()

src/po_man.h

@@ -12,7 +12,7 @@ class DPolyAction : public DThinker
 public:
 	DPolyAction(int polyNum);
 	void Serialize(FSerializer &arc);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Stop();
 	double GetSpeed() const { return m_Speed; }
 

src/r_data/r_interpolate.cpp

@@ -62,7 +62,7 @@ public:
 
 	DSectorPlaneInterpolation() {}
 	DSectorPlaneInterpolation(sector_t *sector, bool plane, bool attach);
-	void Destroy() override;
+	void OnDestroy() override;
 	void UpdateInterpolation();
 	void Restore();
 	void Interpolate(double smoothratio);
@@ -91,7 +91,7 @@ public:
 
 	DSectorScrollInterpolation() {}
 	DSectorScrollInterpolation(sector_t *sector, bool plane);
-	void Destroy() override;
+	void OnDestroy() override;
 	void UpdateInterpolation();
 	void Restore();
 	void Interpolate(double smoothratio);
@@ -119,7 +119,7 @@ public:
 
 	DWallScrollInterpolation() {}
 	DWallScrollInterpolation(side_t *side, int part);
-	void Destroy() override;
+	void OnDestroy() override;
 	void UpdateInterpolation();
 	void Restore();
 	void Interpolate(double smoothratio);
@@ -146,7 +146,7 @@ public:
 
 	DPolyobjInterpolation() {}
 	DPolyobjInterpolation(FPolyObj *poly);
-	void Destroy() override;
+	void OnDestroy() override;
 	void UpdateInterpolation();
 	void Restore();
 	void Interpolate(double smoothratio);
@@ -364,11 +364,11 @@ int DInterpolation::DelRef(bool force)
 //
 //==========================================================================
 
-void DInterpolation::Destroy()
+void DInterpolation::OnDestroy()
 {
 	interpolator.RemoveInterpolation(this);
 	refcount = 0;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -419,7 +419,7 @@ DSectorPlaneInterpolation::DSectorPlaneInterpolation(sector_t *_sector, bool _pl
 //
 //==========================================================================
 
-void DSectorPlaneInterpolation::Destroy()
+void DSectorPlaneInterpolation::OnDestroy()
 {
 	if (sector != nullptr)
 	{
@@ -437,7 +437,7 @@ void DSectorPlaneInterpolation::Destroy()
 	{
 		attached[i]->DelRef();
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -597,7 +597,7 @@ DSectorScrollInterpolation::DSectorScrollInterpolation(sector_t *_sector, bool _
 //
 //==========================================================================
 
-void DSectorScrollInterpolation::Destroy()
+void DSectorScrollInterpolation::OnDestroy()
 {
 	if (sector != nullptr)
 	{
@@ -611,7 +611,7 @@ void DSectorScrollInterpolation::Destroy()
 		}
 		sector = nullptr;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -702,14 +702,14 @@ DWallScrollInterpolation::DWallScrollInterpolation(side_t *_side, int _part)
 //
 //==========================================================================
 
-void DWallScrollInterpolation::Destroy()
+void DWallScrollInterpolation::OnDestroy()
 {
 	if (side != nullptr)
 	{
 		side->textures[part].interpolation = nullptr;
 		side = nullptr;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================
@@ -800,13 +800,13 @@ DPolyobjInterpolation::DPolyobjInterpolation(FPolyObj *po)
 //
 //==========================================================================
 
-void DPolyobjInterpolation::Destroy()
+void DPolyobjInterpolation::OnDestroy()
 {
 	if (poly != nullptr)
 	{
 		poly->interpolation = nullptr;
 	}
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/r_data/r_interpolate.h

@@ -27,7 +27,7 @@ public:
 	int AddRef();
 	int DelRef(bool force = false);
 
-	void Destroy() override;
+	void OnDestroy() override;
 	virtual void UpdateInterpolation() = 0;
 	virtual void Restore() = 0;
 	virtual void Interpolate(double smoothratio) = 0;

src/r_defs.h

@@ -283,7 +283,7 @@ class ASectorAction : public AActor
 	DECLARE_CLASS (ASectorAction, AActor)
 public:
 	ASectorAction (bool activatedByUse = false);
-	void Destroy () override;
+	void OnDestroy() override;
 	void BeginPlay ();
 	void Activate (AActor *source);
 	void Deactivate (AActor *source);

src/s_sndseq.cpp

@@ -106,7 +106,7 @@ class DSeqActorNode : public DSeqNode
 	HAS_OBJECT_POINTERS
 public:
 	DSeqActorNode(AActor *actor, int sequence, int modenum);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	void MakeSound(int loop, FSoundID id)
 	{
@@ -134,7 +134,7 @@ class DSeqPolyNode : public DSeqNode
 	DECLARE_CLASS(DSeqPolyNode, DSeqNode)
 public:
 	DSeqPolyNode(FPolyObj *poly, int sequence, int modenum);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	void MakeSound(int loop, FSoundID id)
 	{
@@ -162,7 +162,7 @@ class DSeqSectorNode : public DSeqNode
 	DECLARE_CLASS(DSeqSectorNode, DSeqNode)
 public:
 	DSeqSectorNode(sector_t *sec, int chan, int sequence, int modenum);
-	void Destroy() override;
+	void OnDestroy() override;
 	void Serialize(FSerializer &arc);
 	void MakeSound(int loop, FSoundID id)
 	{
@@ -379,7 +379,7 @@ void DSeqNode::Serialize(FSerializer &arc)
 	}
 }
 
-void DSeqNode::Destroy()
+void DSeqNode::OnDestroy()
 {
 	// If this sequence was launched by a parent sequence, advance that
 	// sequence now.
@@ -405,7 +405,7 @@ void DSeqNode::Destroy()
 		GC::WriteBarrier(m_Next, m_Prev);
 	}
 	ActiveSequences--;
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 void DSeqNode::StopAndDestroy ()
@@ -1041,31 +1041,31 @@ void SN_DoStop (void *source)
 	}
 }
 
-void DSeqActorNode::Destroy ()
+void DSeqActorNode::OnDestroy ()
 {
 	if (m_StopSound >= 0)
 		S_StopSound (m_Actor, CHAN_BODY);
 	if (m_StopSound >= 1)
 		MakeSound (0, m_StopSound);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
-void DSeqSectorNode::Destroy ()
+void DSeqSectorNode::OnDestroy ()
 {
 	if (m_StopSound >= 0)
 		S_StopSound (m_Sector, Channel & 7);
 	if (m_StopSound >= 1)
 		MakeSound (0, m_StopSound);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
-void DSeqPolyNode::Destroy ()
+void DSeqPolyNode::OnDestroy ()
 {
 	if (m_StopSound >= 0)
 		S_StopSound (m_Poly, CHAN_BODY);
 	if (m_StopSound >= 1)
 		MakeSound (0, m_StopSound);
-	Super::Destroy();
+	Super::OnDestroy();
 }
 
 //==========================================================================

src/s_sndseq.h

@@ -22,7 +22,7 @@ class DSeqNode : public DObject
 public:
 	void Serialize(FSerializer &arc);
 	void StopAndDestroy ();
-	void Destroy() override;
+	void OnDestroy() override;
 	void Tick ();
 	void ChangeData (int seqOffset, int delayTics, float volume, FSoundID currentSoundID);
 	void AddChoice (int seqnum, seqtype_t type);

wadsrc/static/zscript/base.txt

@@ -17,8 +17,10 @@ class Object native
 	native static void SetMusicVolume(float vol);
 
 	native Name GetClassName();
+	native void Destroy();
 
-	/*virtual*/ native void Destroy();
+	// This does not call into the native method of the same name to avoid problems with objects that get garbage collected late on shutdown.
+	virtual void OnDestroy() {}
 }
 
 class Thinker : Object native