- reviewd script code for spawn calls that did not check their results.

Nothing should ever assume that spawning an actor is unconditionally successful. There can always be some edge cases where this is not the case.

wadsrc/static/zscript/doom/archvile.txt

@@ -116,10 +116,13 @@ extend class Actor
 			A_FaceTarget ();
 
 			Actor fog = Spawn (fire, target.Pos, ALLOW_REPLACE);
-			tracer = fog;
-			fog.target = self;
-			fog.tracer = self.target;
-			fog.A_Fire(0);
+			if (fog != null)
+			{
+				tracer = fog;
+				fog.target = self;
+				fog.tracer = self.target;
+				fog.A_Fire(0);
+			}
 		}
 	}
 	

wadsrc/static/zscript/doom/fatso.txt

@@ -188,6 +188,7 @@ extend class Actor
 
 		// Now launch mushroom cloud
 		Actor aimtarget = Spawn("Mapspot", pos, NO_REPLACE);	// We need something to aim at.
+		if (aimtarget == null) return;
 		Actor owner = (flags & MSF_DontHurt) ? target : self;
 		aimtarget.Height = Height;
 		

wadsrc/static/zscript/doom/revenant.txt

@@ -233,10 +233,13 @@ extend class Actor
 		SpawnPuff ("BulletPuff", pos, angle, angle, 3);
 		Actor smoke = Spawn ("RevenantTracerSmoke", Vec3Offset(-Vel.X, -Vel.Y, 0.), ALLOW_REPLACE);
 	
-		smoke.Vel.Z = 1.;
-		smoke.tics -= random[Tracer](0, 3);
-		if (smoke.tics < 1)
-			smoke.tics = 1;
+		if (smoke != null)
+		{
+			smoke.Vel.Z = 1.;
+			smoke.tics -= random[Tracer](0, 3);
+			if (smoke.tics < 1)
+				smoke.tics = 1;
+		}
 
 		// The rest of this function was identical with Strife's version, except for the angle being used.
 		A_Tracer2(16.875);

wadsrc/static/zscript/heretic/chicken.txt

@@ -335,11 +335,14 @@ extend class Actor
 		for (int i = 0; i < count; i++)
 		{
 			Actor mo = Spawn("Feather", pos + (0, 0, 20), NO_REPLACE);
-			mo.target = self;
-			mo.Vel.X = Random2[Feathers]() / 256.;
-			mo.Vel.Y = Random2[Feathers]() / 256.;
-			mo.Vel.Z = 1. + random[Feathers]() / 128.;
-			mo.SetState (mo.SpawnState + (random[Feathers]()&7));
+			if (mo != null)
+			{
+				mo.target = self;
+				mo.Vel.X = Random2[Feathers]() / 256.;
+				mo.Vel.Y = Random2[Feathers]() / 256.;
+				mo.Vel.Z = 1. + random[Feathers]() / 128.;
+				mo.SetState (mo.SpawnState + (random[Feathers]()&7));
+			}
 		}
 	}
 

wadsrc/static/zscript/heretic/dsparil.txt

@@ -166,13 +166,14 @@ class Sorcerer1 : Actor
 	{
 		bSolid = false;
 		Actor mo = Spawn("Sorcerer2", Pos, ALLOW_REPLACE);
-		mo.Translation = Translation;
-		mo.SetStateLabel("Rise");
-		mo.angle = angle;
-		mo.CopyFriendliness (self, true);
+		if (mo != null)
+		{
+			mo.Translation = Translation;
+			mo.SetStateLabel("Rise");
+			mo.angle = angle;
+			mo.CopyFriendliness (self, true);
+		}
 	}
-
-	
 }
 
 
@@ -434,9 +435,12 @@ class Sorcerer2FX1 : Actor
 		for (int i = 0; i < 2; i++)
 		{
 			Actor mo = Spawn("Sorcerer2FXSpark", pos, ALLOW_REPLACE);
-			mo.Vel.X = Random2[BlueSpark]() / 128.;
-			mo.Vel.Y = Random2[BlueSpark]() / 128.;
-			mo.Vel.Z = 1. + Random[BlueSpark]() / 256.;
+			if (mo != null)
+			{
+				mo.Vel.X = Random2[BlueSpark]() / 128.;
+				mo.Vel.Y = Random2[BlueSpark]() / 128.;
+				mo.Vel.Z = 1. + Random[BlueSpark]() / 256.;
+			}
 		}
 	}
 }

wadsrc/static/zscript/heretic/hereticartifacts.txt

@@ -149,7 +149,7 @@ Class ArtiTimeBomb : Inventory
 	override bool Use (bool pickup)
 	{
 		Actor mo = Spawn("ActivatedTimeBomb", Owner.Vec3Angle(24., Owner.angle, - Owner.Floorclip), ALLOW_REPLACE);
-		mo.target = Owner;
+		if (mo != null) mo.target = Owner;
 		return true;
 	}
 	

wadsrc/static/zscript/heretic/hereticimp.txt

@@ -102,14 +102,20 @@ class HereticImp : Actor
 		bNoGravity = false;
 
 		chunk = Spawn("HereticImpChunk1", pos, ALLOW_REPLACE);
-		chunk.vel.x = random2[ImpExplode]() / 64.;
-		chunk.vel.y = random2[ImpExplode]() / 64.;
-		chunk.vel.z = 9;
+		if (chunk != null)
+		{
+			chunk.vel.x = random2[ImpExplode]() / 64.;
+			chunk.vel.y = random2[ImpExplode]() / 64.;
+			chunk.vel.z = 9;
+		}
 
 		chunk = Spawn("HereticImpChunk2", pos, ALLOW_REPLACE);
-		chunk.vel.x = random2[ImpExplode]() / 64.;
-		chunk.vel.y = random2[ImpExplode]() / 64.;
-		chunk.vel.z = 9;
+		if (chunk != null)
+		{
+			chunk.vel.x = random2[ImpExplode]() / 64.;
+			chunk.vel.y = random2[ImpExplode]() / 64.;
+			chunk.vel.z = 9;
+		}
 		
 		if (extremecrash)
 		{

wadsrc/static/zscript/heretic/hereticmisc.txt

@@ -60,10 +60,13 @@ class Pod : Actor
 		for (int count = chance > 240 ? 2 : 1; count; count--)
 		{
 			Actor goo = Spawn(gootype, pos + (0, 0, 48), ALLOW_REPLACE);
-			goo.target = self;
-			goo.Vel.X = Random2[PodPain]() / 128.;
-			goo.Vel.Y = Random2[PodPain]() / 128.;
-			goo.Vel.Z = 0.5 + random[PodPain]() / 128.;
+			if (goo != null)
+			{
+				goo.target = self;
+				goo.Vel.X = Random2[PodPain]() / 128.;
+				goo.Vel.Y = Random2[PodPain]() / 128.;
+				goo.Vel.Z = 0.5 + random[PodPain]() / 128.;
+			}
 		}
 	}
 
@@ -295,12 +298,15 @@ class Volcano : Actor
 		for (int i = 0; i < count; i++)
 		{
 			Actor blast = Spawn("VolcanoBlast", pos + (0, 0, 44), ALLOW_REPLACE);
-			blast.target = self;
-			blast.Angle = random[VolcanoBlast]() * (360 / 256.);
-			blast.VelFromAngle(1.);
-			blast.Vel.Z = 2.5 + random[VolcanoBlast]() / 64.;
-			blast.A_PlaySound ("world/volcano/shoot", CHAN_BODY);
-			blast.CheckMissileSpawn (radius);
+			if (blast != null)
+			{
+				blast.target = self;
+				blast.Angle = random[VolcanoBlast]() * (360 / 256.);
+				blast.VelFromAngle(1.);
+				blast.Vel.Z = 2.5 + random[VolcanoBlast]() / 64.;
+				blast.A_PlaySound ("world/volcano/shoot", CHAN_BODY);
+				blast.CheckMissileSpawn (radius);
+			}
 		}
 	}
 }

wadsrc/static/zscript/heretic/ironlich.txt

@@ -102,12 +102,15 @@ class Ironlich : Actor
 					{
 						A_PlaySound ("ironlich/attack1", CHAN_BODY);
 					}
-					fire.target = baseFire.target;
-					fire.angle = baseFire.angle;
-					fire.Vel = baseFire.Vel;
-					fire.SetDamage(0);
-					fire.health = (i+1) * 2;
-					fire.CheckMissileSpawn (radius);
+					if (fire != null)
+					{
+						fire.target = baseFire.target;
+						fire.angle = baseFire.angle;
+						fire.Vel = baseFire.Vel;
+						fire.SetDamage(0);
+						fire.health = (i+1) * 2;
+						fire.CheckMissileSpawn (radius);
+					}
 				}
 			}
 		}
@@ -167,11 +170,14 @@ class HeadFX1 : Actor
 		for (int i = 0; i < 8; i++)
 		{
 			Actor shard = Spawn("HeadFX2", Pos, ALLOW_REPLACE);
-			shard.target = target;
-			shard.angle = i*45.;
-			shard.VelFromAngle();
-			shard.Vel.Z = -.6;
-			shard.CheckMissileSpawn (radius);
+			if (shard != null)
+			{
+				shard.target = target;
+				shard.angle = i*45.;
+				shard.VelFromAngle();
+				shard.Vel.Z = -.6;
+				shard.CheckMissileSpawn (radius);
+			}
 		}
 	}
 }

wadsrc/static/zscript/heretic/knight.txt

@@ -163,8 +163,11 @@ class RedAxe : KnightAxe
 		double xo = random2[DripBlood]() / 32.0;
 		double yo = random2[DripBlood]() / 32.0;
 		Actor mo = Spawn ("Blood", Vec3Offset(xo, yo, 0.), ALLOW_REPLACE);
-		mo.Vel.X = random2[DripBlood]() / 64.0;
-		mo.Vel.Y = random2[DripBlood]() / 64.0;
-		mo.Gravity = 1./8;
+		if (mo != null)
+		{
+			mo.Vel.X = random2[DripBlood]() / 64.0;
+			mo.Vel.Y = random2[DripBlood]() / 64.0;
+			mo.Gravity = 1./8;
+		}
 	}
 }

wadsrc/static/zscript/heretic/weaponblaster.txt

@@ -160,10 +160,13 @@ class BlasterFX1 : FastProjectile
 		for(int i = 0; i < 8; i++)
 		{
 			Actor ripper = Spawn("Ripper", pos, ALLOW_REPLACE);
-			ripper.target = target;
-			ripper.angle = i*45;
-			ripper.VelFromAngle();
-			ripper.CheckMissileSpawn (radius);
+			if (ripper != null)
+			{
+				ripper.target = target;
+				ripper.angle = i*45;
+				ripper.VelFromAngle();
+				ripper.CheckMissileSpawn (radius);
+			}
 		}
 	}
 }

wadsrc/static/zscript/heretic/weaponmace.txt

@@ -60,14 +60,17 @@ class Mace : HereticWeapon
 		if (random[MaceAtk]() < 28)
 		{
 			Actor ball = Spawn("MaceFX2", Pos + (0, 0, 28 - Floorclip), ALLOW_REPLACE);
-			ball.Vel.Z = 2 - clamp(tan(pitch), -5, 5);
-			ball.target = self;
-			ball.angle = self.angle;
-			ball.AddZ(ball.Vel.Z);
-			ball.VelFromAngle();
-			ball.Vel += Vel.xy / 2;
-			ball.A_PlaySound ("weapons/maceshoot", CHAN_BODY);
-			ball.CheckMissileSpawn (radius);
+			if (ball != null)
+			{
+				ball.Vel.Z = 2 - clamp(tan(pitch), -5, 5);
+				ball.target = self;
+				ball.angle = self.angle;
+				ball.AddZ(ball.Vel.Z);
+				ball.VelFromAngle();
+				ball.Vel += Vel.xy / 2;
+				ball.A_PlaySound ("weapons/maceshoot", CHAN_BODY);
+				ball.CheckMissileSpawn (radius);
+			}
 		}
 		else
 		{
@@ -260,18 +263,24 @@ class MaceFX2 : MaceFX1
 				SetState (SpawnState);
 
 				Actor tiny = Spawn("MaceFX3", Pos, ALLOW_REPLACE);
-				tiny.target = target;
-				tiny.angle = angle + 90.;
-				tiny.VelFromAngle(Vel.Z - 1.);
-				tiny.Vel += (Vel.XY * .5, Vel.Z);
-				tiny.CheckMissileSpawn (radius);
+				if (tiny != null)
+				{
+					tiny.target = target;
+					tiny.angle = angle + 90.;
+					tiny.VelFromAngle(Vel.Z - 1.);
+					tiny.Vel += (Vel.XY * .5, Vel.Z);
+					tiny.CheckMissileSpawn (radius);
+				}
 
 				tiny = Spawn("MaceFX3", Pos, ALLOW_REPLACE);
-				tiny.target = target;
-				tiny.angle = angle - 90.;
-				tiny.VelFromAngle(Vel.Z - 1.);
-				tiny.Vel += (Vel.XY * .5, Vel.Z);
-				tiny.CheckMissileSpawn (radius);
+				if (tiny != null)
+				{
+					tiny.target = target;
+					tiny.angle = angle - 90.;
+					tiny.VelFromAngle(Vel.Z - 1.);
+					tiny.Vel += (Vel.XY * .5, Vel.Z);
+					tiny.CheckMissileSpawn (radius);
+				}
 				return;
 			}
 		}

wadsrc/static/zscript/heretic/weaponphoenix.txt

@@ -151,16 +151,19 @@ class PhoenixRodPowered : PhoenixRod
 
 		slope += 0.1;
 		Actor mo = Spawn("PhoenixFX2", spawnpos, ALLOW_REPLACE);
-		mo.target = self;
-		mo.Angle = Angle;
-		mo.VelFromAngle();
-		mo.Vel.XY += Vel.XY;
-		mo.Vel.Z = mo.Speed * slope;
+		if (mo != null)
+		{
+			mo.target = self;
+			mo.Angle = Angle;
+			mo.VelFromAngle();
+			mo.Vel.XY += Vel.XY;
+			mo.Vel.Z = mo.Speed * slope;
+			mo.CheckMissileSpawn (radius);
+		}
 		if (!player.refire)
 		{
 			A_PlaySound("weapons/phoenixpowshoot", CHAN_WEAPON, 1, true);
 		}	
-		mo.CheckMissileSpawn (radius);
 	}
 
 	//----------------------------------------------------------------------------
@@ -239,10 +242,16 @@ class PhoenixFX1 : Actor
 		//[RH] Heretic never sets the target for seeking
 		//P_SeekerMissile (self, 5, 10);
 		Actor puff = Spawn("PhoenixPuff", Pos, ALLOW_REPLACE);
-		puff.Vel.XY = AngleToVector(Angle + 90, 1.3);
+		if (puff != null)
+		{
+			puff.Vel.XY = AngleToVector(Angle + 90, 1.3);
+		}
 
 		puff = Spawn("PhoenixPuff", Pos, ALLOW_REPLACE);
-		puff.Vel.XY = AngleToVector(Angle - 90, 1.3);
+		if (puff != null)
+		{
+			puff.Vel.XY = AngleToVector(Angle - 90, 1.3);
+		}
 	}
 
 	

wadsrc/static/zscript/hexen/blastradius.txt

@@ -70,7 +70,8 @@ extend class Actor
 			// [RH] Floor and ceiling huggers should not be blasted vertically.
 			if (!victim.bFloorHugger && !victim.bCeilingHugger)
 			{
-				mo.Vel.Z = victim.Vel.Z = 8;
+				victim.Vel.Z = 8;
+				if (mo != null) mo.Vel.Z = 8;
 			}
 		}
 		else

wadsrc/static/zscript/hexen/clericholy.txt

@@ -567,14 +567,17 @@ class HolyTail : Actor
 	static void SpawnSpiritTail (Actor spirit)
 	{
 		Actor tail = Spawn ("HolyTail", spirit.Pos, ALLOW_REPLACE);
-		tail.target = spirit; // parent
-		for (int i = 1; i < 3; i++)
+		if (tail != null)
 		{
-			Actor next = Spawn ("HolyTailTrail", spirit.Pos, ALLOW_REPLACE);
-			tail.tracer = next;
-			tail = next;
+			tail.target = spirit; // parent
+			for (int i = 1; i < 3; i++)
+			{
+				Actor next = Spawn ("HolyTailTrail", spirit.Pos, ALLOW_REPLACE);
+				tail.tracer = next;
+				tail = next;
+			}
+			tail.tracer = null; // last tail bit
 		}
-		tail.tracer = null; // last tail bit
 	}
 
 	//============================================================================

wadsrc/static/zscript/hexen/flechette.txt

@@ -255,10 +255,13 @@ class ArtiPoisonBag : Inventory
 		}
 
 		class<Actor> spawntype = GetFlechetteType(other);
-		Inventory copy = Inventory(Spawn (spawntype));
-		copy.Amount = Amount;
-		copy.MaxAmount = MaxAmount;
-		GoAwayAndDie ();
+		let copy = Inventory(Spawn (spawntype));
+		if (copy != null)
+		{
+			copy.Amount = Amount;
+			copy.MaxAmount = MaxAmount;
+			GoAwayAndDie ();
+		}
 		return copy;
 	}
 }

wadsrc/static/zscript/hexen/korax.txt

@@ -315,17 +315,20 @@ class Korax : Actor
 	private void SpawnKoraxMissile (Vector3 pos, Actor dest, Class<Actor> type)
 	{
 		Actor th = Spawn (type, pos, ALLOW_REPLACE);
-		th.target = self; // Originator
-		double an = th.AngleTo(dest);
-		if (dest.bShadow)
-		{ // Invisible target
-			an += Random2[KoraxMissile]() * (45/256.);
+		if (th != null)
+		{
+			th.target = self; // Originator
+			double an = th.AngleTo(dest);
+			if (dest.bShadow)
+			{ // Invisible target
+				an += Random2[KoraxMissile]() * (45/256.);
+			}
+			th.angle = an;
+			th.VelFromAngle();
+			double dist = dest.DistanceBySpeed(th, th.Speed);
+			th.Vel.Z = (dest.pos.z - pos.Z + 30) / dist;
+			th.CheckMissileSpawn(radius);
 		}
-		th.angle = an;
-		th.VelFromAngle();
-		double dist = dest.DistanceBySpeed(th, th.Speed);
-		th.Vel.Z = (dest.pos.z - pos.Z + 30) / dist;
-		th.CheckMissileSpawn(radius);
 	}
 
 	//============================================================================

wadsrc/static/zscript/raven/minotaur.txt

@@ -262,7 +262,7 @@ class Minotaur : Actor
 				type = "PunchPuff";
 			}
 			Actor puff = Spawn (type, Pos, ALLOW_REPLACE);
-			puff.Vel.Z = 2;
+			if (puff != null) puff.Vel.Z = 2;
 			special1--;
 		}
 		else
@@ -710,9 +710,12 @@ class MinotaurFX2 : MinotaurFX1
 		double y = Random2[MntrFloorFire]() / 64.;
 		
 		Actor mo = Spawn("MinotaurFX3", Vec2OffsetZ(x, y, floorz), ALLOW_REPLACE);
-		mo.target = target;
-		mo.Vel.X = MinVel; // Force block checking
-		mo.CheckMissileSpawn (radius);
+		if (mo != null)
+		{
+			mo.target = target;
+			mo.Vel.X = MinVel; // Force block checking
+			mo.CheckMissileSpawn (radius);
+		}
 	}
 }
 

wadsrc/static/zscript/strife/entityboss.txt

@@ -202,9 +202,12 @@ class EntityBoss : SpectralMonster
 			Vector3 pos = spot.Vec3Angle(secondRadius, an, tracer ? 70. : 0.);
 
 			second = Spawn("EntitySecond", pos, ALLOW_REPLACE);
-			second.CopyFriendliness(self, true);
-			second.A_FaceTarget();
-			second.VelFromAngle(i == 0? 4.8828125 : secondRadius * 4., an);
+			if (second != null)
+			{
+				second.CopyFriendliness(self, true);
+				second.A_FaceTarget();
+				second.VelFromAngle(i == 0? 4.8828125 : secondRadius * 4., an);
+			}
 		}
 	}
 	

wadsrc/static/zscript/strife/inquisitor.txt

@@ -171,9 +171,12 @@ class Inquisitor : Actor
 	void A_TossArm ()
 	{
 		Actor foo = Spawn("InquisitorArm", Pos + (0,0,24), ALLOW_REPLACE);
-		foo.angle = angle - 90. + Random2[Inquisitor]() * (360./1024.);
-		foo.VelFromAngle(foo.Speed / 8);
-		foo.Vel.Z = random[Inquisitor]() / 64.;
+		if (foo != null)
+		{
+			foo.angle = angle - 90. + Random2[Inquisitor]() * (360./1024.);
+			foo.VelFromAngle(foo.Speed / 8);
+			foo.Vel.Z = random[Inquisitor]() / 64.;
+		}
 	}
 
 	

wadsrc/static/zscript/strife/rebels.txt

@@ -163,6 +163,10 @@ class TeleporterBeacon : Inventory
 	{
 		Actor owner = target;
 		Actor rebel = Spawn("Rebel1", (pos.xy, floorz), ALLOW_REPLACE);
+		if (rebel == null)
+		{
+			return;
+		}
 		if (!rebel.TryMove (rebel.Pos.xy, true))
 		{
 			rebel.Destroy ();

wadsrc/static/zscript/strife/sigil.txt

@@ -268,7 +268,7 @@ class Sigil : Weapon
 
 	action void A_FireSigil1 ()
 	{
-		Actor spot;
+		Actor spot = null;
 		FTranslatedLineTarget t;
 
 		if (player == null || player.ReadyWeapon == null)

wadsrc/static/zscript/strife/spectral.txt

@@ -62,11 +62,13 @@ class SpectralMonster : Actor
 			return;
 
 		Actor foo = Spawn("SpectralLightningV2", Pos + (0, 0, 32), ALLOW_REPLACE);
-
-		foo.Vel.Z = -12;
-		foo.target = self;
-		foo.FriendPlayer = 0;
-		foo.tracer = target;
+		if (foo != null)
+		{
+			foo.Vel.Z = -12;
+			foo.target = self;
+			foo.FriendPlayer = 0;
+			foo.tracer = target;
+		}
 
 		Angle -= 90.;
 		for (int i = 0; i < 20; ++i)
@@ -217,9 +219,11 @@ class SpectralLightningH1 : SpectralLightningBase
 	void A_SpectralLightningTail ()
 	{
 		Actor foo = Spawn("SpectralLightningHTail", Vec3Offset(-Vel.X, -Vel.Y, 0.), ALLOW_REPLACE);
-
-		foo.Angle = Angle;
-		foo.FriendPlayer = FriendPlayer;
+		if (foo != null)
+		{
+			foo.Angle = Angle;
+			foo.FriendPlayer = FriendPlayer;
+		}
 	}
 }
 
@@ -386,15 +390,21 @@ class SpectralLightningSpot : SpectralLightningDeath1
 
 		Actor flash = Spawn (cls, Vec2OffsetZ(xo, yo, ONCEILINGZ), ALLOW_REPLACE);
 
-		flash.target = target;
-		flash.Vel.Z = -18;
-		flash.FriendPlayer = FriendPlayer;
+		if (flash != null)
+		{
+			flash.target = target;
+			flash.Vel.Z = -18;
+			flash.FriendPlayer = FriendPlayer;
+		}
 
 		flash = Spawn("SpectralLightningV2", (pos.xy, ONCEILINGZ), ALLOW_REPLACE);
 
-		flash.target = target;
-		flash.Vel.Z = -18;
-		flash.FriendPlayer = FriendPlayer;
+		if (flash != null)
+		{
+			flash.target = target;
+			flash.Vel.Z = -18;
+			flash.FriendPlayer = FriendPlayer;
+		}
 	}
 	
 }

wadsrc/static/zscript/strife/strifefunctions.txt

@@ -133,7 +133,10 @@ extend class Actor
 	void A_DropFire()
 	{
 		Actor drop = Spawn("FireDroplet", pos + (0,0,24), ALLOW_REPLACE);
-		drop.Vel.Z = -1.;
+		if (drop != null)
+		{
+			drop.Vel.Z = -1.;
+		}
 		A_Explode(64, 64, XF_NOSPLASH, damagetype: 'Fire');
 	}