- Converted all action functions be directly callable by the VM (though they are not yet

usable).

SVN r2154 (scripting)

src/d_dehacked.cpp

@@ -1603,7 +1603,7 @@ static void SetPointer(FState *state, PSymbol *sym, int frame = 0)
 	else
 	{
 		FString symname = sym->SymbolName.GetChars();
-		state->SetAction(static_cast<PSymbolActionFunction*>(sym));
+		state->SetAction(static_cast<PSymbolActionFunction*>(sym)->Function);
 
 		// Note: CompareNoCase() calls stricmp() and therefore returns 0 when they're the same.
 		for (unsigned int i = 0; i < MBFCodePointers.Size(); i++)

src/dobjgc.cpp

@@ -71,6 +71,7 @@
 #include "r_interpolate.h"
 #include "doomstat.h"
 #include "m_argv.h"
+#include "autosegs.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -328,6 +329,17 @@ static void MarkRoot()
 		SectorMarker->SecNum = 0;
 	}
 	Mark(SectorMarker);
+	// Mark action functions
+	if (!FinalGC)
+	{
+		FAutoSegIterator probe(ARegHead, ARegTail);
+
+		while (*++probe != NULL)
+		{
+			AFuncDesc *afunc = (AFuncDesc *)*probe;
+			Mark(*(afunc->VMPointer));
+		}
+	}
 	// Mark classes
 	for (unsigned j = 0; j < PClass::m_Types.Size(); ++j)
 	{
@@ -362,7 +374,7 @@ static void MarkRoot()
 //
 // Atomic
 //
-// If their were any propagations that needed to be done atomicly, they
+// If there were any propagations that needed to be done atomicly, they
 // would go here. It also sets things up for the sweep state.
 //
 //==========================================================================

src/dobjtype.cpp

@@ -224,7 +224,7 @@ void PClass::InsertIntoHash ()
 }
 
 // Find a type, passed the name as a name
-const PClass *PClass::FindClass (FName zaname)
+PClass *PClass::FindClass (FName zaname)
 {
 	if (zaname == NAME_None)
 	{
@@ -518,7 +518,9 @@ size_t PClass::PropagateMark()
 IMPLEMENT_ABSTRACT_CLASS(PSymbol);
 IMPLEMENT_CLASS(PSymbolConst);
 IMPLEMENT_CLASS(PSymbolVariable);
-IMPLEMENT_CLASS(PSymbolActionFunction);
+IMPLEMENT_POINTY_CLASS(PSymbolActionFunction)
+ DECLARE_POINTER(Function)
+END_POINTERS
 IMPLEMENT_POINTY_CLASS(PSymbolVMFunction)
  DECLARE_POINTER(Function)
 END_POINTERS

src/dobjtype.h

@@ -6,6 +6,7 @@
 #endif
 
 #include "thingdef/thingdef_type.h"
+#include "vm.h"
 
 // Symbol information -------------------------------------------------------
 
@@ -81,23 +82,27 @@ public:
 // parameters passed.
 struct FState;
 struct StateCallData;
-typedef void (*actionf_p)(AActor *self, AActor *stateowner, FState *state, int parameters, StateCallData *statecall);
+class VMFrameStack;
+struct VMValue;
+struct VMReturn;
+typedef int (*actionf_p)(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret);/*(VM_ARGS)*/
+class VMFunction;
 
 class PSymbolActionFunction : public PSymbol
 {
 	DECLARE_CLASS(PSymbolActionFunction, PSymbol);
+	HAS_OBJECT_POINTERS;
 public:
 	FString Arguments;
-	actionf_p Function;
+	VMFunction *Function;
 	int defaultparameterindex;
 
 	PSymbolActionFunction(FName name) : PSymbol(name, SYM_ActionFunction) {}
 	PSymbolActionFunction() : PSymbol(NAME_None, SYM_ActionFunction) {}
 };
 
-// A symbol table -----------------------------------------------------------
+// A VM function ------------------------------------------------------------
 
-class VMFunction;
 class PSymbolVMFunction : public PSymbol
 {
 	DECLARE_CLASS(PSymbolVMFunction, PSymbol);
@@ -195,10 +200,10 @@ public:
 	}
 
 	// Find a type, given its name.
-	static const PClass *FindClass (const char *name) { return FindClass (FName (name, true)); }
-	static const PClass *FindClass (const FString &name) { return FindClass (FName (name, true)); }
-	static const PClass *FindClass (ENamedName name) { return FindClass (FName (name)); }
-	static const PClass *FindClass (FName name);
+	static PClass *FindClass (const char *name) { return FindClass (FName (name, true)); }
+	static PClass *FindClass (const FString &name) { return FindClass (FName (name, true)); }
+	static PClass *FindClass (ENamedName name) { return FindClass (FName (name)); }
+	static PClass *FindClass (FName name);
 	const PClass *FindClassTentative (FName name);	// not static!
 
 	static TArray<PClass *> m_Types;

src/g_doom/a_arachnotron.cpp

@@ -8,18 +8,23 @@
 */
 
 DEFINE_ACTION_FUNCTION(AActor, A_BspiAttack)
-{		
+{
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 
 	// launch a missile
 	P_SpawnMissile (self, self->target, PClass::FindClass("ArachnotronPlasma"));
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_BabyMetal)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_BODY, "baby/walk", 1, ATTN_IDLE);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }

src/g_doom/a_archvile.cpp

@@ -21,7 +21,9 @@ void A_Fire(AActor *self, int height);
 //
 DEFINE_ACTION_FUNCTION(AActor, A_VileStart)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_VOICE, "vile/start", 1, ATTN_NORM);
+	return 0;
 }
 
 
@@ -31,22 +33,27 @@ DEFINE_ACTION_FUNCTION(AActor, A_VileStart)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_StartFire)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_BODY, "vile/firestrt", 1, ATTN_NORM);
 	A_Fire (self, 0);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireCrackle)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_BODY, "vile/firecrkl", 1, ATTN_NORM);
 	A_Fire (self, 0);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Fire)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_FIXED(height,0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_FIXED_OPT(height)		{ height = 0; }
 	
 	A_Fire(self, height);
+	return 0;
 }
 
 void A_Fire(AActor *self, int height)
@@ -77,12 +84,13 @@ void A_Fire(AActor *self, int height)
 //
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileTarget)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(fire,0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(fire, AActor)	{ fire = PClass::FindClass("ArchvileFire"); }
+
 	AActor *fog;
 		
 	if (!self->target)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 
@@ -93,6 +101,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileTarget)
 	fog->target = self;
 	fog->tracer = self->target;
 	A_Fire(fog, 0);
+	return 0;
 }
 
 
@@ -102,25 +111,25 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileTarget)
 // A_VileAttack
 //
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileAttack)
-{		
-	ACTION_PARAM_START(6);
-	ACTION_PARAM_SOUND(snd,0);
-	ACTION_PARAM_INT(dmg,1);
-	ACTION_PARAM_INT(blastdmg,2);
-	ACTION_PARAM_INT(blastrad,3);
-	ACTION_PARAM_FIXED(thrust,4);
-	ACTION_PARAM_NAME(dmgtype,5);
+{
+	PARAM_ACTION_PROLOGUE;
+	PARAM_SOUND_OPT	(snd)		{ snd = "vile/stop"; }
+	PARAM_INT_OPT	(dmg)		{ dmg = 20; }
+	PARAM_INT_OPT	(blastdmg)	{ blastdmg = 70; }
+	PARAM_INT_OPT	(blastrad)	{ blastrad = 70; }
+	PARAM_FIXED_OPT	(thrust)	{ thrust = FRACUNIT; }
+	PARAM_NAME_OPT	(dmgtype)	{ dmgtype = NAME_Fire; }
 
 	AActor *fire, *target;
 	angle_t an;
 		
 	if (NULL == (target = self->target))
-		return;
+		return 0;
 	
 	A_FaceTarget (self);
 
 	if (!P_CheckSight (self, target, 0) )
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, snd, 1, ATTN_NORM);
 	P_TraceBleed (dmg, target);
@@ -139,4 +148,5 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_VileAttack)
 		P_RadiusAttack (fire, self, blastdmg, blastrad, dmgtype, false);
 	}
 	target->velz = Scale(thrust, 1000, target->Mass);
+	return 0;
 }

src/g_doom/a_bossbrain.cpp

@@ -18,13 +18,17 @@ static FRandom pr_spawnfly ("SpawnFly");
 
 DEFINE_ACTION_FUNCTION(AActor, A_BrainAwake)
 {
+	PARAM_ACTION_PROLOGUE;
 	// killough 3/26/98: only generates sound now
 	S_Sound (self, CHAN_VOICE, "brain/sight", 1, ATTN_NONE);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_BrainPain)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_VOICE, "brain/pain", 1, ATTN_NONE);
+	return 0;
 }
 
 static void BrainishExplosion (fixed_t x, fixed_t y, fixed_t z)
@@ -53,6 +57,7 @@ static void BrainishExplosion (fixed_t x, fixed_t y, fixed_t z)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BrainScream)
 {
+	PARAM_ACTION_PROLOGUE;
 	fixed_t x;
 		
 	for (x = self->x - 196*FRACUNIT; x < self->x + 320*FRACUNIT; x += 8*FRACUNIT)
@@ -61,34 +66,40 @@ DEFINE_ACTION_FUNCTION(AActor, A_BrainScream)
 			128 + (pr_brainscream() << (FRACBITS + 1)));
 	}
 	S_Sound (self, CHAN_VOICE, "brain/death", 1, ATTN_NONE);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_BrainExplode)
 {
+	PARAM_ACTION_PROLOGUE;
 	fixed_t x = self->x + pr_brainexplode.Random2()*2048;
 	fixed_t z = 128 + pr_brainexplode()*2*FRACUNIT;
 	BrainishExplosion (x, self->y, z);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_BrainDie)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] If noexit, then don't end the level.
 	if ((deathmatch || alwaysapplydmflags) && (dmflags & DF_NO_EXIT))
-		return;
+		return 0;
 
 	G_ExitLevel (0, false);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BrainSpit)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS(spawntype, AActor);
+
 	DSpotState *state = DSpotState::GetSpotState();
 	AActor *targ;
 	AActor *spit;
 	bool isdefault = false;
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
-
 	// shoot a cube at current target
 	targ = state->GetNextInList(PClass::FindClass("BossTarget"), G_SkillProperty(SKILLP_EasyBossBrain));
 
@@ -135,6 +146,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BrainSpit)
 			S_Sound (self, CHAN_WEAPON, "brain/spit", 1, ATTN_NONE);
 		}
 	}
+	return 0;
 }
 
 static void SpawnFly(AActor *self, const PClass *spawntype, FSoundID sound)
@@ -255,10 +267,10 @@ static void SpawnFly(AActor *self, const PClass *spawntype, FSoundID sound)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnFly)
 {
-	FSoundID sound;
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT	(spawntype, AActor)	{ spawntype = NULL; }
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+	FSoundID sound;
 
 	if (spawntype != NULL) 
 	{
@@ -266,15 +278,18 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnFly)
 	}
 	else
 	{
-		spawntype = PClass::FindClass ("SpawnFire");
+		spawntype = PClass::FindClass("SpawnFire");
 		sound = "brain/spawn";
 	}
 	SpawnFly(self, spawntype, sound);
+	return 0;
 }
 
 // travelling cube sound
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnSound)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_BODY, "brain/cube", 1, ATTN_IDLE);
 	SpawnFly(self, PClass::FindClass("SpawnFire"), "brain/spawn");
+	return 0;
 }

src/g_doom/a_bruiser.cpp

@@ -3,8 +3,10 @@ static FRandom pr_bruisattack ("BruisAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_BruisAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	if (self->CheckMeleeRange ())
 	{
@@ -12,9 +14,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_BruisAttack)
 		S_Sound (self, CHAN_WEAPON, "baron/melee", 1, ATTN_NORM);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	
 	// launch a missile
 	P_SpawnMissile (self, self->target, PClass::FindClass("BaronBall"));
+	return 0;
 }

src/g_doom/a_cacodemon.cpp

@@ -14,8 +14,10 @@ static FRandom pr_headattack ("HeadAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_HeadAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	if (self->CheckMeleeRange ())
@@ -24,9 +26,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_HeadAttack)
 		S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	
 	// launch a missile
 	P_SpawnMissile (self, self->target, PClass::FindClass("CacodemonBall"));
+	return 0;
 }

src/g_doom/a_cyberdemon.cpp

@@ -9,15 +9,21 @@
 
 DEFINE_ACTION_FUNCTION(AActor, A_CyberAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	P_SpawnMissile (self, self->target, PClass::FindClass("Rocket"));
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Hoof)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "cyber/hoof", 1, ATTN_IDLE);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }

src/g_doom/a_demon.cpp

@@ -13,8 +13,10 @@ static FRandom pr_sargattack ("SargAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SargAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	if (self->CheckMeleeRange ())
@@ -23,4 +25,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_SargAttack)
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
 	}
+	return 0;
 }

src/g_doom/a_doomimp.cpp

@@ -17,8 +17,10 @@ static FRandom pr_troopattack ("TroopAttack");
 //
 DEFINE_ACTION_FUNCTION(AActor, A_TroopAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	if (self->CheckMeleeRange ())
@@ -27,9 +29,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_TroopAttack)
 		S_Sound (self, CHAN_WEAPON, "imp/melee", 1, ATTN_NORM);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	
 	// launch a missile
 	P_SpawnMissile (self, self->target, PClass::FindClass("DoomImpBall"));
+	return 0;
 }

src/g_doom/a_doommisc.cpp

@@ -37,6 +37,8 @@
 
 DEFINE_ACTION_FUNCTION(AActor, A_BarrelDestroy)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if ((dmflags2 & DF2_BARRELS_RESPAWN) &&
 		(deathmatch || alwaysapplydmflags))
 	{
@@ -48,5 +50,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_BarrelDestroy)
 	{
 		self->Destroy ();
 	}
+	return 0;
 }
 

src/g_doom/a_doomweaps.cpp

@@ -28,6 +28,8 @@ static FRandom pr_oldbfg ("OldBFG");
 //
 DEFINE_ACTION_FUNCTION(AActor, A_Punch)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t 	angle;
 	int 		damage;
 	int 		pitch;
@@ -39,7 +41,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Punch)
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 		}
 	}
 
@@ -63,6 +65,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Punch)
 										linetarget->x,
 										linetarget->y);
 	}
+	return 0;
 }
 
 //
@@ -70,6 +73,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_Punch)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FirePistol)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	bool accurate;
 
 	if (self->player != NULL)
@@ -78,7 +83,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePistol)
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 
 			P_SetPsprite (self->player, ps_flash, weapon->FindState(NAME_Flash));
 		}
@@ -94,6 +99,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePistol)
 	S_Sound (self, CHAN_WEAPON, "weapons/pistol", 1, ATTN_NORM);
 
 	P_GunShot (self, accurate, PClass::FindClass(NAME_BulletPuff), P_BulletSlope (self));
+	return 0;
 }
 
 //
@@ -101,32 +107,34 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePistol)
 //
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_SOUND_OPT	(fullsound)		 { fullsound = "weapons/sawfull"; }
+	PARAM_SOUND_OPT	(hitsound)			{ hitsound = "weapons/sawhit"; }
+	PARAM_INT_OPT	(damage)			{ damage = 2; }
+	PARAM_CLASS_OPT	(pufftype, AActor)	{ pufftype = NULL; }
+
 	angle_t 	angle;
 	player_t *player;
 	AActor *linetarget;
 
-	ACTION_PARAM_START(4);
-	ACTION_PARAM_SOUND(fullsound, 0);
-	ACTION_PARAM_SOUND(hitsound, 1);
-	ACTION_PARAM_INT(damage, 2);
-	ACTION_PARAM_CLASS(pufftype, 3);
-
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 
-	if (pufftype == NULL) pufftype = PClass::FindClass(NAME_BulletPuff);
-	if (damage == 0) damage = 2;
+	if (pufftype == NULL)
+		pufftype = PClass::FindClass(NAME_BulletPuff);
+	if (damage == 0)
+		damage = 2;
 	
-	damage *= (pr_saw()%10+1);
+	damage *= (pr_saw()%10 + 1);
 	angle = self->angle;
 	angle += pr_saw.Random2() << 18;
 	
@@ -138,7 +146,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
 	if (!linetarget)
 	{
 		S_Sound (self, CHAN_WEAPON, fullsound, 1, ATTN_NORM);
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_WEAPON, hitsound, 1, ATTN_NORM);
 		
@@ -160,6 +168,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
 			self->angle += ANG90/20;
 	}
 	self->flags |= MF_JUSTATTACKED;
+	return 0;
 }
 
 //
@@ -167,12 +176,14 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	S_Sound (self, CHAN_WEAPON,  "weapons/shotgf", 1, ATTN_NORM);
@@ -180,7 +191,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun)
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 		P_SetPsprite (player, ps_flash, weapon->FindState(NAME_Flash));
 	}
 	player->mo->PlayAttacking2 ();
@@ -189,6 +200,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun)
 
 	for (i=0 ; i<7 ; i++)
 		P_GunShot (self, false, PClass::FindClass(NAME_BulletPuff), pitch);
+	return 0;
 }
 
 //
@@ -196,6 +208,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int 		i;
 	angle_t 	angle;
 	int 		damage;
@@ -203,7 +217,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun2)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	S_Sound (self, CHAN_WEAPON, "weapons/sshotf", 1, ATTN_NORM);
@@ -211,7 +225,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun2)
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 		P_SetPsprite (player, ps_flash, weapon->FindState(NAME_Flash));
 	}
 	player->mo->PlayAttacking2 ();
@@ -237,22 +251,29 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireShotgun2)
 					  pitch + (pr_fireshotgun2.Random2() * 332063), damage,
 					  NAME_None, NAME_BulletPuff);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_OpenShotgun2)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_WEAPON, "weapons/sshoto", 1, ATTN_NORM);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_LoadShotgun2)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_WEAPON, "weapons/sshotl", 1, ATTN_NORM);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CloseShotgun2)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_WEAPON, "weapons/sshotc", 1, ATTN_NORM);
 	CALL_ACTION(A_ReFire, self);
+	return 0;
 }
 
 
@@ -305,18 +326,20 @@ void P_SetSafeFlash(AWeapon * weapon, player_t * player, FState * flashstate, in
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FireCGun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (self == NULL || NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 		
 		S_Sound (self, CHAN_WEAPON, "weapons/chngun", 1, ATTN_NORM);
 
@@ -340,6 +363,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireCGun)
 	player->mo->PlayAttacking2 ();
 
 	P_GunShot (self, !player->refire, PClass::FindClass(NAME_BulletPuff), P_BulletSlope (self));
+	return 0;
 }
 
 //
@@ -347,19 +371,22 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireCGun)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FireMissile)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, PClass::FindClass("Rocket"));
+	return 0;
 }
 
 //
@@ -367,20 +394,23 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMissile)
 //
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireSTGrenade)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(grenade, AActor)	{ grenade = PClass::FindClass("Grenade"); }
+
 	player_t *player;
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(grenade, 0);
-	if (grenade == NULL) return;
+
+	if (grenade == NULL)
+		return 0;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 		
 	// Temporarily raise the pitch to send the grenade slightly upwards
@@ -388,6 +418,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireSTGrenade)
 	self->pitch -= (1152 << FRACBITS);
 	P_SpawnPlayerMissile(self, grenade);
 	self->pitch = SavedPlayerPitch;
+	return 0;
 }
 
 //
@@ -395,17 +426,19 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireSTGrenade)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_FirePlasma)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 
 		FState *flash = weapon->FindState(NAME_Flash);
 		if (flash != NULL)
@@ -415,6 +448,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePlasma)
 	}
 
 	P_SpawnPlayerMissile (self, PClass::FindClass("PlasmaBall"));
+	return 0;
 }
 
 //
@@ -451,22 +485,29 @@ static void FireRailgun(AActor *self, int RailOffset)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireRailgun)
 {
+	PARAM_ACTION_PROLOGUE;
 	FireRailgun(self, 0);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireRailgunRight)
 {
+	PARAM_ACTION_PROLOGUE;
 	FireRailgun(self, 10);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireRailgunLeft)
 {
+	PARAM_ACTION_PROLOGUE;
 	FireRailgun(self, -10);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_RailWait)
 {
 	// Okay, this was stupid. Just use a NULL function instead of this.
+	return 0;
 }
 
 //
@@ -475,21 +516,24 @@ DEFINE_ACTION_FUNCTION(AActor, A_RailWait)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireBFG)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 
 	P_SpawnPlayerMissile (self,  0, 0, 0, PClass::FindClass("BFGBall"), self->angle, NULL, NULL, !!(dmflags2 & DF2_NO_FREEAIMBFG));
+	return 0;
 }
 
 //
@@ -498,6 +542,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireBFG)
 //
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT	(spraytype, AActor)		{ spraytype = NULL; }
+	PARAM_INT_OPT	(numrays)				{ numrays = 40; }
+	PARAM_INT_OPT	(damagecnt)				{ damagecnt = 15; }
+
 	int 				i;
 	int 				j;
 	int 				damage;
@@ -505,10 +554,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 	AActor				*thingToHit;
 	AActor				*linetarget;
 
-	ACTION_PARAM_START(3);
-	ACTION_PARAM_CLASS(spraytype, 0);
-	ACTION_PARAM_INT(numrays, 1);
-	ACTION_PARAM_INT(damagecnt, 2);
 
 	if (spraytype == NULL) spraytype = PClass::FindClass("BFGExtra");
 	if (numrays <= 0) numrays = 40;
@@ -516,7 +561,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 
 	// [RH] Don't crash if no target
 	if (!self->target)
-		return;
+		return 0;
 
 	// offset angles from its attack angle
 	for (i = 0; i < numrays; i++)
@@ -544,6 +589,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 		P_DamageMobj (thingToHit, self->target, self->target, damage, NAME_BFGSplash);
 		P_TraceBleed (damage, thingToHit, self->target);
 	}
+	return 0;
 }
 
 //
@@ -551,7 +597,9 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BFGSpray)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_BFGsound)
 {
+	PARAM_ACTION_PROLOGUE;
 	S_Sound (self, CHAN_WEAPON, "weapons/bfgf", 1, ATTN_NORM);
+	return 0;
 }
 
 //
@@ -565,6 +613,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BFGsound)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireOldBFG)
 {
+	PARAM_ACTION_PROLOGUE;
 	const PClass * plasma[] = {PClass::FindClass("PlasmaBall1"), PClass::FindClass("PlasmaBall2")};
 	AActor * mo = NULL;
 
@@ -572,14 +621,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireOldBFG)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	self->player->extralight = 2;
 
@@ -597,5 +646,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireOldBFG)
 		self->angle = SavedPlayerAngle;
 		self->pitch = SavedPlayerPitch;
     }
-	if (doesautoaim) self->player->ReadyWeapon->WeaponFlags &= ~WIF_NOAUTOAIM; // Restore autoaim setting
+	if (doesautoaim)
+	{ // Restore autoaim setting
+		self->player->ReadyWeapon->WeaponFlags &= ~WIF_NOAUTOAIM;
+	}
+	return 0;
 }

src/g_doom/a_fatso.cpp

@@ -19,20 +19,23 @@
 
 DEFINE_ACTION_FUNCTION(AActor, A_FatRaise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FaceTarget (self);
 	S_Sound (self, CHAN_WEAPON, "fatso/raiseguns", 1, ATTN_NORM);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack1)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(spawntype, AActor)	{ spawntype = NULL; }
+
 	AActor *missile;
 	angle_t an;
 
 	if (!self->target)
-		return;
-
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+		return 0;
 
 	if (spawntype == NULL) spawntype = PClass::FindClass("FatShot");
 
@@ -49,18 +52,19 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack1)
 		missile->velx = FixedMul (missile->Speed, finecosine[an]);
 		missile->vely = FixedMul (missile->Speed, finesine[an]);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack2)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(spawntype, AActor)	{ spawntype = NULL; }
+
 	AActor *missile;
 	angle_t an;
 
 	if (!self->target)
-		return;
-
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+		return 0;
 
 	if (spawntype == NULL) spawntype = PClass::FindClass("FatShot");
 
@@ -77,18 +81,19 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack2)
 		missile->velx = FixedMul (missile->Speed, finecosine[an]);
 		missile->vely = FixedMul (missile->Speed, finesine[an]);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack3)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(spawntype, AActor)	{ spawntype = NULL; }
+
 	AActor *missile;
 	angle_t an;
 
 	if (!self->target)
-		return;
-
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+		return 0;
 
 	if (spawntype == NULL) spawntype = PClass::FindClass("FatShot");
 
@@ -111,6 +116,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FatAttack3)
 		missile->velx = FixedMul (missile->Speed, finecosine[an]);
 		missile->vely = FixedMul (missile->Speed, finesine[an]);
 	}
+	return 0;
 }
 
 //
@@ -122,14 +128,14 @@ AActor * P_OldSpawnMissile(AActor * source, AActor * dest, const PClass *type);
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Mushroom)
 {
-	int i, j;
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT	(spawntype, AActor)		{ spawntype = NULL; }
+	PARAM_INT_OPT	(n)						{ n = 0; }
+	PARAM_INT_OPT	(flags)					{ flags = 0; }
+	PARAM_FIXED_OPT	(vrange)				{ vrange = 4*FRACUNIT; }
+	PARAM_FIXED_OPT	(hrange)				{ hrange = FRACUNIT/2; }
 
-	ACTION_PARAM_START(5);
-	ACTION_PARAM_CLASS(spawntype, 0);
-	ACTION_PARAM_INT(n, 1);
-	ACTION_PARAM_INT(flags, 2);
-	ACTION_PARAM_FIXED(vrange, 3);
-	ACTION_PARAM_FIXED(hrange, 4);
+	int i, j;
 
 	if (n == 0) n = self->Damage; // GetMissileDamage (0, 1);
 	if (spawntype == NULL) spawntype = PClass::FindClass("FatShot");
@@ -169,4 +175,5 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Mushroom)
 		}
 	}
 	target->Destroy();
+	return 0;
 }

src/g_doom/a_keen.cpp

@@ -13,8 +13,12 @@
 // DOOM II special, map 32.
 // Uses special tag 666 by default.
 //
+
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_KeenDie)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT(doortag);
+
 	CALL_ACTION(A_NoBlocking, self);
 	
 	// scan the remaining thinkers to see if all Keens are dead
@@ -27,14 +31,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_KeenDie)
 		if (other != self && other->health > 0 && other->IsA (matchClass))
 		{
 			// other Keen not dead
-			return;
+			return 0;
 		}
 	}
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(doortag, 0);
-
 	EV_DoDoor (DDoor::doorOpen, NULL, NULL, doortag, 2*FRACUNIT, 0, 0, 0);
+	return 0;
 }
 
 

src/g_doom/a_lostsoul.cpp

@@ -48,24 +48,29 @@ void A_SkullAttack(AActor *self, fixed_t speed)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SkullAttack)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_FIXED(n, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_FIXED_OPT(speed) { speed = SKULLSPEED; }
 
-	if (n <= 0) n = SKULLSPEED;
-	A_SkullAttack(self, n);
+	if (speed <= 0)
+		speed = SKULLSPEED;
+	A_SkullAttack(self, speed);
+	return 0;
 }
 
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_BetaSkullAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int damage;
 	if (!self || !self->target || self->target->GetSpecies() == self->GetSpecies())
-		return;
+		return 0;
 	S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
 	A_FaceTarget(self);
 	damage = (pr_oldsoul()%8+1)*self->Damage;
 	P_DamageMobj(self->target, self, self, damage, NAME_None);
+	return 0;
 }
 
 

src/g_doom/a_painelemental.cpp

@@ -12,13 +12,22 @@
 
 DECLARE_ACTION(A_SkullAttack)
 
-static const PClass *GetSpawnType(DECLARE_PARAMINFO)
+static const PClass *GetSpawnType(VMValue *param)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+	const PClass *spawntype;
 
-	if (spawntype == NULL) spawntype = PClass::FindClass("LostSoul");
-	return spawntype;
+	if (param == NULL || param->Type == REGT_NIL)
+	{
+		spawntype = NULL;
+	}
+	else
+	{
+		assert(param->Type == REGT_POINTER);
+		assert(param->atag == ATAG_OBJECT || param->a == NULL);
+		spawntype = (const PClass *)param->a;
+	}
+
+	return (spawntype != NULL) ? spawntype : PClass::FindClass("LostSoul");
 }
 
 
@@ -38,7 +47,7 @@ void A_PainShootSkull (AActor *self, angle_t angle, const PClass *spawntype)
 	int prestep;
 
 	if (spawntype == NULL) return;
-	if (self->DamageType==NAME_Massacre) return;
+	if (self->DamageType == NAME_Massacre) return;
 
 	// [RH] check to make sure it's not too close to the ceiling
 	if (self->z + self->height + 8*FRACUNIT > self->ceilingz)
@@ -139,34 +148,43 @@ void A_PainShootSkull (AActor *self, angle_t angle, const PClass *spawntype)
 // 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PainAttack)
 {
-	if (!self->target)
-		return;
+	PARAM_ACTION_PROLOGUE;
 
-	const PClass *spawntype = GetSpawnType(PUSH_PARAMINFO);
+	if (!self->target)
+		return 0;
+
+	const PClass *spawntype = GetSpawnType(numparam > NAP ? &param[NAP] : NULL);
 	A_FaceTarget (self);
 	A_PainShootSkull (self, self->angle, spawntype);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DualPainAttack)
 {
-	if (!self->target)
-		return;
+	PARAM_ACTION_PROLOGUE;
 
-	const PClass *spawntype = GetSpawnType(PUSH_PARAMINFO);
+	if (!self->target)
+		return 0;
+
+	const PClass *spawntype = GetSpawnType(numparam > NAP ? &param[NAP] : NULL);
 	A_FaceTarget (self);
 	A_PainShootSkull (self, self->angle + ANG45, spawntype);
 	A_PainShootSkull (self, self->angle - ANG45, spawntype);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PainDie)
 {
-	if (self->target != NULL && self->IsFriend (self->target))
+	PARAM_ACTION_PROLOGUE;
+
+	if (self->target != NULL && self->IsFriend(self->target))
 	{ // And I thought you were my friend!
 		self->flags &= ~MF_FRIENDLY;
 	}
-	const PClass *spawntype = GetSpawnType(PUSH_PARAMINFO);
+	const PClass *spawntype = GetSpawnType(numparam > NAP ? &param[NAP] : NULL);
 	CALL_ACTION(A_NoBlocking, self);
 	A_PainShootSkull (self, self->angle + ANG90, spawntype);
 	A_PainShootSkull (self, self->angle + ANG180, spawntype);
 	A_PainShootSkull (self, self->angle + ANG270, spawntype);
+	return 0;
 }

src/g_doom/a_possessed.cpp

@@ -20,12 +20,14 @@ static FRandom pr_cposrefire ("CPosRefire");
 //
 DEFINE_ACTION_FUNCTION(AActor, A_PosAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int angle;
 	int damage;
 	int slope;
 		
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	angle = self->angle;
@@ -35,6 +37,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PosAttack)
 	angle += pr_posattack.Random2() << 20;
 	damage = ((pr_posattack()%5)+1)*3;
 	P_LineAttack (self, angle, MISSILERANGE, slope, damage, NAME_None, NAME_BulletPuff);
+	return 0;
 }
 
 static void A_SPosAttack2 (AActor *self)
@@ -57,33 +60,41 @@ static void A_SPosAttack2 (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SPosAttackUseAtkSound)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
 	A_SPosAttack2 (self);
+	return 0;
 }
 
 // This version of the function, which uses a hard-coded sound, is
 // meant for Dehacked only.
 DEFINE_ACTION_FUNCTION(AActor, A_SPosAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "shotguy/attack", 1, ATTN_NORM);
 	A_SPosAttack2 (self);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CPosAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int angle;
 	int bangle;
 	int damage;
 	int slope;
 		
 	if (!self->target)
-		return;
+		return 0;
 
 	// [RH] Andy Baker's stealth monsters
 	if (self->flags & MF_STEALTH)
@@ -99,15 +110,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_CPosAttack)
 	angle = bangle + (pr_cposattack.Random2() << 20);
 	damage = ((pr_cposattack()%5)+1)*3;
 	P_LineAttack (self, angle, MISSILERANGE, slope, damage, NAME_None, NAME_BulletPuff);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CPosRefire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// keep firing unless target got out of sight
 	A_FaceTarget (self);
 
 	if (pr_cposrefire() < 40)
-		return;
+		return 0;
 
 	if (!self->target
 		|| P_HitFriend (self)
@@ -116,4 +130,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_CPosRefire)
 	{
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }

src/g_doom/a_revenant.cpp

@@ -19,11 +19,13 @@ static FRandom pr_skelfist ("SkelFist");
 // A_SkelMissile
 //
 DEFINE_ACTION_FUNCTION(AActor, A_SkelMissile)
-{		
+{
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *missile;
 		
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 	missile = P_SpawnMissileZ (self, self->z + 48*FRACUNIT,
@@ -35,12 +37,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkelMissile)
 		missile->y += missile->vely;
 		missile->tracer = self->target;
 	}
+	return 0;
 }
 
 #define TRACEANGLE (0xc000000)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t exact;
 	fixed_t dist;
 	fixed_t slope;
@@ -57,7 +62,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 	// [RH] level.time is always 0-based, so nothing special to do here.
 
 	if (level.time & 3)
-		return;
+		return 0;
 	
 	// spawn a puff of smoke behind the rocket
 	P_SpawnPuff (self, PClass::FindClass(NAME_BulletPuff), self->x, self->y, self->z, 0, 3);
@@ -74,7 +79,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 	dest = self->tracer;
 		
 	if (!dest || dest->health <= 0 || self->Speed == 0 || !self->CanSeek(dest))
-		return;
+		return 0;
 	
 	// change angle 	
 	exact = R_PointToAngle2 (self->x, self->y, dest->x,  dest->y);
@@ -124,21 +129,27 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer)
 		else
 			self->velz += FRACUNIT/8;
 	}
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_SkelWhoosh)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 	A_FaceTarget (self);
 	S_Sound (self, CHAN_WEAPON, "skeleton/swing", 1, ATTN_NORM);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_SkelFist)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 				
 	A_FaceTarget (self);
 		
@@ -149,4 +160,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkelFist)
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
 	}
+	return 0;
 }

src/g_doom/a_scriptedmarine.cpp

@@ -164,17 +164,19 @@ void AScriptedMarine::Tick ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_Refire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL || self->target->health <= 0)
 	{
 		if (self->MissileState && pr_m_refire() < 160)
 		{ // Look for a new target most of the time
 			if (P_LookForPlayers (self, true, NULL) && P_CheckMissileRange (self))
 			{ // Found somebody new and in range, so don't stop shooting
-				return;
+				return 0;
 			}
 		}
 		self->SetState (self->state + 1);
-		return;
+		return 0;
 	}
 	if ((self->MissileState == NULL && !self->CheckMeleeRange ()) ||
 		!P_CheckSight (self, self->target) ||
@@ -182,6 +184,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_Refire)
 	{
 		self->SetState (self->state + 1);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -192,15 +195,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_Refire)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_SawRefire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL || self->target->health <= 0)
 	{
 		self->SetState (self->state + 1);
-		return;
+		return 0;
 	}
 	if (!self->CheckMeleeRange ())
 	{
 		self->SetState (self->state + 1);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -211,10 +217,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_SawRefire)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MarineNoise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (static_cast<AScriptedMarine *>(self)->CurrentWeapon == AScriptedMarine::WEAPON_Chainsaw)
 	{
 		S_Sound (self, CHAN_WEAPON, "weapons/sawidle", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -225,8 +234,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_MarineNoise)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MarineChase)
 {
+	PARAM_ACTION_PROLOGUE;
 	CALL_ACTION(A_MarineNoise, self);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }
 
 //============================================================================
@@ -237,8 +248,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_MarineChase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MarineLook)
 {
+	PARAM_ACTION_PROLOGUE;
 	CALL_ACTION(A_MarineNoise, self);
 	CALL_ACTION(A_Look, self);
+	return 0;
 }
 
 //============================================================================
@@ -249,14 +262,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_MarineLook)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_Saw)
 {
-	ACTION_PARAM_START(4);
-	ACTION_PARAM_SOUND(fullsound, 0);
-	ACTION_PARAM_SOUND(hitsound, 1);
-	ACTION_PARAM_INT(damage, 2);
-	ACTION_PARAM_CLASS(pufftype, 3);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_SOUND_OPT	(fullsound)			{ fullsound = "weapons/sawfull"; }
+	PARAM_SOUND_OPT	(hitsound)			{ hitsound = "weapons/sawhit"; }
+	PARAM_INT_OPT	(damage)			{ damage = 2; }
+	PARAM_CLASS_OPT	(pufftype, AActor)	{ pufftype = NULL; }
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	if (pufftype == NULL) pufftype = PClass::FindClass(NAME_BulletPuff);
 	if (damage == 0) damage = 2;
@@ -277,7 +290,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_Saw)
 		if (!linetarget)
 		{
 			S_Sound (self, CHAN_WEAPON, fullsound, 1, ATTN_NORM);
-			return;
+			return 0;
 		}
 		S_Sound (self, CHAN_WEAPON, hitsound, 1, ATTN_NORM);
 			
@@ -303,6 +316,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_Saw)
 		S_Sound (self, CHAN_WEAPON, fullsound, 1, ATTN_NORM);
 	}
 	//A_Chase (self);
+	return 0;
 }
 
 //============================================================================
@@ -338,10 +352,11 @@ static void MarinePunch(AActor *self, int damagemul)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_Punch)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(mult, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT(mult);
 
 	MarinePunch(self, mult);
+	return 0;
 }
 
 //============================================================================
@@ -374,16 +389,17 @@ void P_GunShot2 (AActor *mo, bool accurate, int pitch, const PClass *pufftype)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_FirePistol)
 {
-	if (self->target == NULL)
-		return;
+	PARAM_ACTION_PROLOGUE;
+	PARAM_BOOL(accurate);
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_BOOL(accurate, 0);
+	if (self->target == NULL)
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "weapons/pistol", 1, ATTN_NORM);
 	A_FaceTarget (self);
 	P_GunShot2 (self, accurate, P_AimLineAttack (self, self->angle, MISSILERANGE),
 		PClass::FindClass(NAME_BulletPuff));
+	return 0;
 }
 
 //============================================================================
@@ -394,10 +410,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_FirePistol)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pitch;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON,  "weapons/shotgf", 1, ATTN_NORM);
 	A_FaceTarget (self);
@@ -407,6 +425,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun)
 		P_GunShot2 (self, false, pitch, PClass::FindClass(NAME_BulletPuff));
 	}
 	self->special1 = level.maptime + 27;
+	return 0;
 }
 
 //============================================================================
@@ -417,6 +436,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_CheckAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->special1 != 0 || self->target == NULL)
 	{
 		self->SetState (self->FindState("SkipAttack"));
@@ -425,6 +446,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_CheckAttack)
 	{
 		A_FaceTarget (self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -435,10 +457,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_CheckAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pitch;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "weapons/sshotf", 1, ATTN_NORM);
 	A_FaceTarget (self);
@@ -453,6 +477,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun2)
 					  NAME_None, PClass::FindClass(NAME_BulletPuff));
 	}
 	self->special1 = level.maptime;
+	return 0;
 }
 
 //============================================================================
@@ -463,16 +488,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireShotgun2)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_FireCGun)
 {
-	if (self->target == NULL)
-		return;
+	PARAM_ACTION_PROLOGUE;
+	PARAM_BOOL(accurate);
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_BOOL(accurate, 0);
+	if (self->target == NULL)
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "weapons/chngun", 1, ATTN_NORM);
 	A_FaceTarget (self);
 	P_GunShot2 (self, accurate, P_AimLineAttack (self, self->angle, MISSILERANGE),
 		PClass::FindClass(NAME_BulletPuff));
+	return 0;
 }
 
 //============================================================================
@@ -487,8 +513,10 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_M_FireCGun)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FireMissile)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	if (self->CheckMeleeRange ())
 	{ // If too close, punch it
@@ -499,6 +527,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireMissile)
 		A_FaceTarget (self);
 		P_SpawnMissile (self, self->target, PClass::FindClass("Rocket"));
 	}
+	return 0;
 }
 
 //============================================================================
@@ -509,11 +538,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireMissile)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FireRailgun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	CALL_ACTION(A_MonsterRail, self);
 	self->special1 = level.maptime + 50;
+	return 0;
 }
 
 //============================================================================
@@ -524,12 +556,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FireRailgun)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FirePlasma)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 	P_SpawnMissile (self, self->target, PClass::FindClass("PlasmaBall"));
 	self->special1 = level.maptime + 20;
+	return 0;
 }
 
 //============================================================================
@@ -540,8 +575,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_FirePlasma)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_BFGsound)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	if (self->special1 != 0)
 	{
@@ -554,6 +591,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_BFGsound)
 		// Don't interrupt the firing sequence
 		self->PainChance = 0;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -564,13 +602,16 @@ DEFINE_ACTION_FUNCTION(AActor, A_M_BFGsound)
 
 DEFINE_ACTION_FUNCTION(AActor, A_M_FireBFG)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 	P_SpawnMissile (self, self->target, PClass::FindClass("BFGBall"));
 	self->special1 = level.maptime + 30;
 	self->PainChance = MARINE_PAIN_CHANCE;
+	return 0;
 }
 
 //---------------------------------------------------------------------------

src/g_doom/a_spidermaster.cpp

@@ -13,11 +13,13 @@ static FRandom pr_spidrefire ("SpidRefire");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpidRefire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// keep firing unless target got out of sight
 	A_FaceTarget (self);
 
 	if (pr_spidrefire() < 10)
-		return;
+		return 0;
 
 	if (!self->target
 		|| P_HitFriend (self)
@@ -26,10 +28,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpidRefire)
 	{
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Metal)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "spider/walk", 1, ATTN_IDLE);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }

src/g_heretic/a_chicken.cpp

@@ -66,9 +66,11 @@ void AChickenPlayer::MorphPlayerThink ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_ChicAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	if (self->CheckMeleeRange())
 	{
@@ -76,6 +78,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ChicAttack)
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -86,6 +89,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_ChicAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Feathers)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	int count;
 	AActor *mo;
@@ -107,6 +112,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Feathers)
 		mo->velz = FRACUNIT + (pr_feathers() << 9);
 		mo->SetState (mo->SpawnState + (pr_feathers()&7));
 	}
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -132,14 +138,17 @@ void P_UpdateBeak (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BeakRaise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	player->psprites[ps_weapon].sy = WEAPONTOP;
 	P_SetPsprite (player, ps_weapon, player->ReadyWeapon->GetReadyState());
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -161,6 +170,8 @@ void P_PlayPeck (AActor *chicken)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -169,7 +180,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL1)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	damage = 1 + (pr_beakatkpl1()&3);
@@ -184,6 +195,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL1)
 	P_PlayPeck (player->mo);
 	player->chickenPeck = 12;
 	player->psprites[ps_weapon].tics -= pr_beakatkpl1() & 7;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -194,6 +206,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -202,7 +216,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL2)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	damage = pr_beakatkpl2.HitDice (4);
@@ -217,4 +231,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeakAttackPL2)
 	P_PlayPeck (player->mo);
 	player->chickenPeck = 12;
 	player->psprites[ps_weapon].tics -= pr_beakatkpl2()&3;
+	return 0;
 }

src/g_heretic/a_dsparil.cpp

@@ -28,8 +28,11 @@ static FRandom pr_bluespark ("BlueSpark");
 
 DEFINE_ACTION_FUNCTION(AActor, A_Sor1Pain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1 = 20; // Number of steps to walk fast
 	CALL_ACTION(A_Pain, self);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -40,12 +43,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_Sor1Pain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Sor1Chase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->special1)
 	{
 		self->special1--;
 		self->tics -= 3;
 	}
-	A_Chase(self);
+	A_Chase(stack, self);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -58,13 +64,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_Sor1Chase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Srcr1Attack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	fixed_t velz;
 	angle_t angle;
 
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_BODY, self->AttackSound, 1, ATTN_NORM);
 	if (self->CheckMeleeRange ())
@@ -72,7 +80,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr1Attack)
 		int damage = pr_scrc1atk.HitDice (8);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 
 	const PClass *fx = PClass::FindClass("SorcererFX1");
@@ -103,6 +111,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr1Attack)
 			}
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -113,6 +122,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr1Attack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcererRise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	self->flags &= ~MF_SOLID;
@@ -120,6 +131,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcererRise)
 	mo->SetState (mo->FindState("Rise"));
 	mo->angle = self->angle;
 	mo->CopyFriendliness (self, true);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -165,6 +177,7 @@ void P_DSparilTeleport (AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Decide)
 {
+	PARAM_ACTION_PROLOGUE;
 
 	static const int chance[] =
 	{
@@ -181,6 +194,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Decide)
 	{
 		P_DSparilTeleport (self);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -191,11 +205,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Decide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Attack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int chance;
 
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_BODY, self->AttackSound, 1, ATTN_NONE);
 	if (self->CheckMeleeRange())
@@ -203,7 +219,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Attack)
 		int damage = pr_s2a.HitDice (20);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	chance = self->health < self->SpawnHealth()/2 ? 96 : 48;
 	if (pr_s2a() < chance)
@@ -220,6 +236,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Attack)
 	{ // Blue bolt
 		P_SpawnMissile (self, self->target, PClass::FindClass("Sorcerer2FX1"));
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -230,6 +247,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_Srcr2Attack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BlueSpark)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	AActor *mo;
 
@@ -240,6 +259,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BlueSpark)
 		mo->vely = pr_bluespark.Random2() << 9;
 		mo->velz = FRACUNIT + (pr_bluespark()<<8);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -250,6 +270,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BlueSpark)
 
 DEFINE_ACTION_FUNCTION(AActor, A_GenWizard)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = Spawn("Wizard", self->x, self->y, self->z, ALLOW_REPLACE);
@@ -273,6 +295,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_GenWizard)
 			Spawn<ATeleportFog> (self->x, self->y, self->z, ALLOW_REPLACE);
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -283,8 +306,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_GenWizard)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Sor2DthInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1 = 7; // Animation loop counter
 	P_Massacre (); // Kill monsters early
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -295,9 +321,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_Sor2DthInit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Sor2DthLoop)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (--self->special1)
 	{ // Need to loop
 		self->SetState (self->FindState("DeathLoop"));
 	}
+	return 0;
 }
 

src/g_heretic/a_hereticartifacts.cpp

@@ -47,6 +47,8 @@ bool AArtiTomeOfPower::Use (bool pickup)
 
 DEFINE_ACTION_FUNCTION(AActor, A_TimeBomb)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->z += 32*FRACUNIT;
 	self->RenderStyle = STYLE_Add;
 	self->alpha = FRACUNIT;
@@ -55,6 +57,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_TimeBomb)
 	{
 		P_HitFloor (self);
 	}
+	return 0;
 }
 
 class AArtiTimeBomb : public AInventory

src/g_heretic/a_hereticimp.cpp

@@ -19,6 +19,8 @@ static FRandom pr_imp ("ImpExplode");
 
 DEFINE_ACTION_FUNCTION(AActor, A_ImpExplode)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *chunk;
 
 	self->flags &= ~MF_NOGRAVITY;
@@ -36,6 +38,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ImpExplode)
 	{ // Extreme death crash
 		self->SetState (self->FindState("XCrash"));
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -46,8 +49,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_ImpExplode)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ImpDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~MF_SOLID;
 	self->flags2 |= MF2_FLOORCLIP;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -58,9 +64,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_ImpDeath)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ImpXDeath1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~MF_SOLID;
 	self->flags |= MF_NOGRAVITY;
 	self->flags2 |= MF2_FLOORCLIP;
 	self->special1 = 666; // Flag the crash routine
+	return 0;
 }
 

src/g_heretic/a_hereticmisc.cpp

@@ -42,8 +42,8 @@ static FRandom pr_volcimpact ("VolcBallImpact");
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PodPain)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(gootype, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT	(gootype, AActor)	{ gootype = PClass::FindClass("PodGoo"); }
 
 	int count;
 	int chance;
@@ -52,7 +52,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PodPain)
 	chance = pr_podpain ();
 	if (chance < 128)
 	{
-		return;
+		return 0;
 	}
 	for (count = chance > 240 ? 2 : 1; count; count--)
 	{
@@ -62,6 +62,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PodPain)
 		goo->vely = pr_podpain.Random2() << 9;
 		goo->velz = FRACUNIT/2 + (pr_podpain() << 9);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -72,15 +73,18 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_PodPain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RemovePod)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
-	if ( (mo = self->master))
+	if ( (mo = self->master) )
 	{
 		if (mo->special1 > 0)
 		{
 			mo->special1--;
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -93,8 +97,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_RemovePod)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MakePod)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(podtype, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(podtype, AActor)	{ podtype = PClass::FindClass("Pod"); }
 
 	AActor *mo;
 	fixed_t x;
@@ -103,7 +107,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MakePod)
 
 	if (self->special1 == MAX_GEN_PODS)
 	{ // Too many generated pods
-		return;
+		return 0;
 	}
 	x = self->x;
 	y = self->y;
@@ -112,14 +116,14 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MakePod)
 	if (!P_CheckPosition (mo, x, y))
 	{ // Didn't fit
 		mo->Destroy ();
-		return;
+		return 0;
 	}
 	mo->SetState (mo->FindState("Grow"));
 	P_ThrustMobj (mo, pr_makepod()<<24, (fixed_t)(4.5*FRACUNIT));
 	S_Sound (mo, CHAN_BODY, self->AttackSound, 1, ATTN_IDLE);
 	self->special1++; // Increment generated pod count
 	mo->master = self; // Link the generator to the pod
-	return;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -130,10 +134,13 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MakePod)
 
 DEFINE_ACTION_FUNCTION(AActor, A_AccTeleGlitter)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (++self->health > 35)
 	{
 		self->velz += self->velz/2;
 	}
+	return 0;
 }
 
 
@@ -145,7 +152,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_AccTeleGlitter)
 
 DEFINE_ACTION_FUNCTION(AActor, A_VolcanoSet)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->tics = 105 + (pr_volcano() & 127);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -156,6 +166,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcanoSet)
 
 DEFINE_ACTION_FUNCTION(AActor, A_VolcanoBlast)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	int count;
 	AActor *blast;
@@ -176,6 +188,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcanoBlast)
 		S_Sound (blast, CHAN_BODY, "world/volcano/shoot", 1, ATTN_NORM);
 		P_CheckMissileSpawn (blast);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -186,6 +199,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcanoBlast)
 
 DEFINE_ACTION_FUNCTION(AActor, A_VolcBallImpact)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	AActor *tiny;
 	angle_t angle;
@@ -210,5 +225,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_VolcBallImpact)
 		tiny->velz = FRACUNIT + (pr_volcimpact() << 9);
 		P_CheckMissileSpawn (tiny);
 	}
+	return 0;
 }
 

src/g_heretic/a_hereticweaps.cpp

@@ -61,6 +61,8 @@ extern bool P_AutoUseChaosDevice (player_t *player);
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_StaffAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int slope;
 	player_t *player;
@@ -68,18 +70,17 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_StaffAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
-	ACTION_PARAM_START(2);
-	ACTION_PARAM_INT(damage, 0);
-	ACTION_PARAM_CLASS(puff, 1);
+	PARAM_INT	(damage);
+	PARAM_CLASS	(puff, AActor);
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	if (puff == NULL) puff = PClass::FindClass(NAME_BulletPuff);	// just to be sure
 	angle = self->angle;
@@ -93,6 +94,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_StaffAttack)
 		self->angle = R_PointToAngle2 (self->x,
 			self->y, linetarget->x, linetarget->y);
 	}
+	return 0;
 }
 
 
@@ -104,20 +106,22 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_StaffAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	angle_t pitch = P_BulletSlope(self);
 	damage = 7+(pr_fgw()&7);
@@ -128,6 +132,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL1)
 	}
 	P_LineAttack (self, angle, PLAYERMISSILERANGE, pitch, damage, NAME_None, "GoldWandPuff1");
 	S_Sound (self, CHAN_WEAPON, "weapons/wandhit", 1, ATTN_NORM);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -138,6 +143,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	angle_t angle;
 	int damage;
@@ -146,14 +153,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL2)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	angle_t pitch = P_BulletSlope(self);
 	velz = FixedMul (GetDefaultByName("GoldWandFX2")->Speed,
@@ -168,6 +175,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL2)
 		angle += ((ANG45/8)*2)/4;
 	}
 	S_Sound (self, CHAN_WEAPON, "weapons/wandhit", 1, ATTN_NORM);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -178,22 +186,25 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireGoldWandPL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireCrossbowPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX1"));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX3"), self->angle-(ANG45/10));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX3"), self->angle+(ANG45/10));
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -204,24 +215,27 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireCrossbowPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireCrossbowPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX2"));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX2"), self->angle-(ANG45/10));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX2"), self->angle+(ANG45/10));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX3"), self->angle-(ANG45/5));
 	P_SpawnPlayerMissile (self, PClass::FindClass("CrossbowFX3"), self->angle+(ANG45/5));
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -232,6 +246,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireCrossbowPL2)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GauntletAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -243,17 +259,16 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GauntletAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(power, 0);
+	PARAM_INT(power);
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	player->psprites[ps_weapon].sx = ((pr_gatk()&3)-2) * FRACUNIT;
 	player->psprites[ps_weapon].sy = WEAPONTOP + (pr_gatk()&3) * FRACUNIT;
@@ -281,7 +296,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GauntletAttack)
 			player->extralight = !player->extralight;
 		}
 		S_Sound (self, CHAN_AUTO, "weapons/gauntletson", 1, ATTN_NORM);
-		return;
+		return 0;
 	}
 	randVal = pr_gatk();
 	if (randVal < 64)
@@ -323,6 +338,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GauntletAttack)
 			self->angle += ANG90/20;
 	}
 	self->flags |= MF_JUSTATTACKED;
+	return 0;
 }
 
 // --- Mace -----------------------------------------------------------------
@@ -406,24 +422,26 @@ void FireMacePL1B (AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *ball;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	if (pr_maceatk() < 28)
 	{
 		FireMacePL1B (self);
-		return;
+		return 0;
 	}
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	player->psprites[ps_weapon].sx = ((pr_maceatk()&3)-2)*FRACUNIT;
 	player->psprites[ps_weapon].sy = WEAPONTOP+(pr_maceatk()&3)*FRACUNIT;
@@ -433,6 +451,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL1)
 	{
 		ball->special1 = 16; // tics till dropoff
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -443,14 +462,16 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MacePL1Check)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->special1 == 0)
 	{
-		return;
+		return 0;
 	}
 	self->special1 -= 4;
 	if (self->special1 > 0)
 	{
-		return;
+		return 0;
 	}
 	self->special1 = 0;
 	self->flags &= ~MF_NOGRAVITY;
@@ -469,6 +490,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MacePL1Check)
 	self->vely = (int)(self->vely * velscale);
 #endif
 	self->velz -= self->velz >> 1;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -479,6 +501,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MacePL1Check)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if ((self->health != MAGIC_JUNK) && (self->flags & MF_INBOUNCE))
 	{ // Bounce
 		self->health = MAGIC_JUNK;
@@ -494,6 +518,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact)
 		self->gravity = FRACUNIT;
 		S_Sound (self, CHAN_BODY, "weapons/macehit", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -504,6 +529,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MaceBallImpact2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *tiny;
 	angle_t angle;
 
@@ -558,6 +585,7 @@ boom:
 		self->BounceFlags = BOUNCE_None;
 		self->gravity = FRACUNIT;
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -568,20 +596,22 @@ boom:
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	player_t *player;
 	AActor *linetarget;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	mo = P_SpawnPlayerMissile (self, 0,0,0, RUNTIME_CLASS(AMaceFX4), self->angle, &linetarget);
 	if (mo)
@@ -596,6 +626,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL2)
 		}
 	}
 	S_Sound (self, CHAN_WEAPON, "weapons/maceshoot", 1, ATTN_NORM);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -606,6 +637,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMacePL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DeathBallImpact)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	AActor *target;
 	angle_t angle = 0;
@@ -615,7 +648,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DeathBallImpact)
 	if ((self->z <= self->floorz) && P_HitFloor (self))
 	{ // Landed in some sort of liquid
 		self->Destroy ();
-		return;
+		return 0;
 	}
 	if (self->flags & MF_INBOUNCE)
 	{
@@ -687,6 +720,7 @@ boom:
 		self->gravity = FRACUNIT;
 		S_Sound (self, CHAN_BODY, "weapons/maceexplode", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 
@@ -762,20 +796,22 @@ int ARipper::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireBlasterPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	angle_t pitch = P_BulletSlope(self);
 	damage = pr_fb1.HitDice (4);
@@ -786,6 +822,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireBlasterPL1)
 	}
 	P_LineAttack (self, angle, PLAYERMISSILERANGE, pitch, damage, NAME_None, "BlasterPuff");
 	S_Sound (self, CHAN_WEAPON, "weapons/blastershoot", 1, ATTN_NORM);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -796,6 +833,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireBlasterPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnRippers)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	angle_t angle;
 	AActor *ripper;
@@ -811,6 +850,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnRippers)
 		ripper->vely = FixedMul (ripper->Speed, finesine[angle]);
 		P_CheckMissileSpawn (ripper);
 	}
+	return 0;
 }
 
 // --- Skull rod ------------------------------------------------------------
@@ -883,19 +923,21 @@ void ARainTracker::Serialize (FArchive &arc)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	mo = P_SpawnPlayerMissile (self, PClass::FindClass("HornRodFX1"));
 	// Randomize the first frame
@@ -903,6 +945,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL1)
 	{
 		mo->SetState (mo->state->GetNextState());
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -916,19 +959,21 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 	AActor *MissileActor;
 	AActor *linetarget;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, 0,0,0, RUNTIME_CLASS(AHornRodFX2), self->angle, &linetarget, &MissileActor);
 	// Use MissileActor instead of the return value from
@@ -943,6 +988,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL2)
 		}
 		S_Sound (MissileActor, CHAN_WEAPON, "weapons/hornrodpowshoot", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -953,11 +999,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSkullRodPL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_AddPlayerRain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	ARainTracker *tracker;
 
 	if (self->target == NULL || self->target->health <= 0)
 	{ // Shooter is dead or nonexistant
-		return;
+		return 0;
 	}
 
 	tracker = self->target->FindInventory<ARainTracker> ();
@@ -1000,6 +1048,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AddPlayerRain)
 		tracker->Rain1 = self;
 	}
 	self->special1 = S_FindSound ("misc/rain");
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1010,6 +1059,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_AddPlayerRain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t x;
 	fixed_t y;
 	AActor *mo;
@@ -1021,7 +1072,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 		if (self->target == NULL)
 		{ // Player left the game
 			self->Destroy ();
-			return;
+			return 0;
 		}
 		tracker = self->target->FindInventory<ARainTracker> ();
 		if (tracker != NULL)
@@ -1036,11 +1087,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 			}
 		}
 		self->Destroy ();
-		return;
+		return 0;
 	}
 	if (pr_storm() < 25)
 	{ // Fudge rain frequency
-		return;
+		return 0;
 	}
 	x = self->x + ((pr_storm()&127) - 64) * FRACUNIT;
 	y = self->y + ((pr_storm()&127) - 64) * FRACUNIT;
@@ -1056,6 +1107,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 	{
 		S_Sound (self, CHAN_BODY|CHAN_LOOP, self->special1, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1066,6 +1118,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SkullRodStorm)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RainImpact)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->z > self->floorz)
 	{
 		self->SetState (self->FindState("NotFloor"));
@@ -1074,6 +1128,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RainImpact)
 	{
 		P_HitFloor (self);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1084,7 +1139,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_RainImpact)
 
 DEFINE_ACTION_FUNCTION(AActor, A_HideInCeiling)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->z = self->ceilingz + 4*FRACUNIT;
+	return 0;
 }
 
 // --- Phoenix Rod ----------------------------------------------------------
@@ -1168,25 +1226,28 @@ int APhoenixFX2::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, RUNTIME_CLASS(APhoenixFX1));
 	angle = self->angle + ANG180;
 	angle >>= ANGLETOFINESHIFT;
 	self->velx += FixedMul (4*FRACUNIT, finecosine[angle]);
 	self->vely += FixedMul (4*FRACUNIT, finesine[angle]);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1197,6 +1258,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PhoenixPuff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *puff;
 	angle_t angle;
 
@@ -1214,6 +1277,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PhoenixPuff)
 	puff->velx = FixedMul (FRACUNIT*13/10, finecosine[angle]);
 	puff->vely = FixedMul (FRACUNIT*13/10, finesine[angle]);
 	puff->velz = 0;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1224,6 +1288,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_PhoenixPuff)
 
 DEFINE_ACTION_FUNCTION(AActor, A_InitPhoenixPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		APhoenixRod *flamethrower = static_cast<APhoenixRod *> (self->player->ReadyWeapon);
@@ -1232,6 +1298,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_InitPhoenixPL2)
 			flamethrower->FlameCount = FLAME_THROWER_TICS;
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1244,6 +1311,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_InitPhoenixPL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	angle_t angle;
 	fixed_t x, y, z;
@@ -1254,7 +1323,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	soundid = "weapons/phoenixpowshoot";
@@ -1265,7 +1334,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 		P_SetPsprite (player, ps_weapon, flamethrower->FindState("Powerdown"));
 		player->refire = 0;
 		S_StopSound (self, CHAN_WEAPON);
-		return;
+		return 0;
 	}
 	angle = self->angle;
 	x = self->x + (pr_fp2.Random2() << 9);
@@ -1284,6 +1353,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 		S_Sound (self, CHAN_WEAPON|CHAN_LOOP, soundid, 1, ATTN_NORM);
 	}	
 	P_CheckMissileSpawn (mo);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1294,19 +1364,22 @@ DEFINE_ACTION_FUNCTION(AActor, A_FirePhoenixPL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ShutdownPhoenixPL2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	S_StopSound (self, CHAN_WEAPON);
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1317,7 +1390,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShutdownPhoenixPL2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FlameEnd)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->velz += FRACUNIT*3/2;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1328,6 +1404,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_FlameEnd)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FloatPuff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->velz += FRACUNIT*18/10;
+	return 0;
 }
 

src/g_heretic/a_ironlich.cpp

@@ -59,6 +59,8 @@ int AWhirlwind::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	AActor *fire;
 	AActor *baseFire;
@@ -77,7 +79,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 	target = self->target;
 	if (target == NULL)
 	{
-		return;
+		return 0;
 	}
 	A_FaceTarget (self);
 	if (self->CheckMeleeRange ())
@@ -85,7 +87,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 		int damage = pr_atk.HitDice (6);
 		P_DamageMobj (target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, target, self);
-		return;
+		return 0;
 	}
 	dist = P_AproxDistance (self->x-target->x, self->y-target->y)
 		> 8*64*FRACUNIT;
@@ -133,6 +135,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 			S_Sound (self, CHAN_BODY, "ironlich/attack3", 1, ATTN_NORM);
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -143,13 +146,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WhirlwindSeek)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->health -= 3;
 	if (self->health < 0)
 	{
 		self->velx = self->vely = self->velz = 0;
 		self->SetState (self->FindState(NAME_Death));
 		self->flags &= ~MF_MISSILE;
-		return;
+		return 0;
 	}
 	if ((self->special2 -= 3) < 0)
 	{
@@ -158,9 +163,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_WhirlwindSeek)
 	}
 	if (self->tracer && self->tracer->flags&MF_SHADOW)
 	{
-		return;
+		return 0;
 	}
 	P_SeekerMissile (self, ANGLE_1*10, ANGLE_1*30);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -171,6 +177,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_WhirlwindSeek)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LichIceImpact)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	angle_t angle;
 	AActor *shard;
@@ -187,6 +195,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichIceImpact)
 		shard->velz = -FRACUNIT*6/10;
 		P_CheckMissileSpawn (shard);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -197,6 +206,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichIceImpact)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LichFireGrow)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->health--;
 	self->z += 9*FRACUNIT;
 	if (self->health == 0)
@@ -204,5 +215,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichFireGrow)
 		self->Damage = self->GetDefault()->Damage;
 		self->SetState (self->FindState("NoGrow"));
 	}
+	return 0;
 }
 

src/g_heretic/a_knight.cpp

@@ -21,6 +21,8 @@ static FRandom pr_knightatk ("KnightAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_DripBlood)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	fixed_t x, y;
 
@@ -30,6 +32,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DripBlood)
 	mo->velx = pr_dripblood.Random2 () << 10;
 	mo->vely = pr_dripblood.Random2 () << 10;
 	mo->gravity = FRACUNIT/8;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -40,9 +43,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_DripBlood)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KnightAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	if (self->CheckMeleeRange ())
 	{
@@ -50,16 +55,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_KnightAttack)
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
 		S_Sound (self, CHAN_BODY, "hknight/melee", 1, ATTN_NORM);
-		return;
+		return 0;
 	}
 	// Throw axe
 	S_Sound (self, CHAN_BODY, self->AttackSound, 1, ATTN_NORM);
 	if (self->flags & MF_SHADOW || pr_knightatk () < 40)
 	{ // Red axe
 		P_SpawnMissileZ (self, self->z + 36*FRACUNIT, self->target, PClass::FindClass("RedAxe"));
-		return;
+		return 0;
 	}
 	// Green axe
 	P_SpawnMissileZ (self, self->z + 36*FRACUNIT, self->target, PClass::FindClass("KnightAxe"));
+	return 0;
 }
 

src/g_heretic/a_wizard.cpp

@@ -20,8 +20,11 @@ static FRandom pr_wizatk3 ("WizAtk3");
 
 DEFINE_ACTION_FUNCTION(AActor, A_GhostOff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->RenderStyle = STYLE_Normal;
 	self->flags3 &= ~MF3_GHOST;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -32,8 +35,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_GhostOff)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WizAtk1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FaceTarget (self);
 	CALL_ACTION(A_GhostOff, self);
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -44,10 +50,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_WizAtk1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WizAtk2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FaceTarget (self);
 	self->alpha = HR_SHADOW;
 	self->RenderStyle = STYLE_Translucent;
 	self->flags3 |= MF3_GHOST;
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -58,12 +67,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_WizAtk2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WizAtk3)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	CALL_ACTION(A_GhostOff, self);
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
 	if (self->CheckMeleeRange())
@@ -71,7 +82,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WizAtk3)
 		int damage = pr_wizatk3.HitDice (4);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	const PClass *fx = PClass::FindClass("WizardFX1");
 	mo = P_SpawnMissile (self, self->target, fx);
@@ -80,4 +91,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_WizAtk3)
 		P_SpawnMissileAngle(self, fx, mo->angle-(ANG45/8), mo->velz);
 		P_SpawnMissileAngle(self, fx, mo->angle+(ANG45/8), mo->velz);
 	}
+	return 0;
 }

src/g_hexen/a_bats.cpp

@@ -27,17 +27,22 @@ static FRandom pr_batmove ("BatMove");
 
 DEFINE_ACTION_FUNCTION(AActor, A_BatSpawnInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1 = 0;	// Frequency count
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_BatSpawn)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int delta;
 	angle_t angle;
 
 	// Countdown until next spawn
-	if (self->special1-- > 0) return;
+	if (self->special1-- > 0) return 0;
 	self->special1 = self->args[0];		// Reset frequency count
 
 	delta = self->args[1];
@@ -51,11 +56,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_BatSpawn)
 		mo->special2 = self->args[3]<<3;		// Set lifetime
 		mo->target = self;
 	}
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_BatMove)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t newangle;
 
 	if (self->special2 < 0)
@@ -86,4 +94,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_BatMove)
 	// Handle Z movement
 	self->z = self->target->z + 2*FloatBobOffsets[self->args[0]];
 	self->args[0] = (self->args[0]+3)&63;	
+	return 0;
 }

src/g_hexen/a_bishop.cpp

@@ -24,9 +24,11 @@ static FRandom pr_pain ("BishopPainBlur");
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_BODY, self->AttackSound, 1, ATTN_NORM);
 	if (self->CheckMeleeRange())
@@ -34,9 +36,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack)
 		int damage = pr_atk.HitDice (4);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	self->special1 = (pr_atk() & 3) + 5;
+	return 0;
 }
 
 //============================================================================
@@ -48,13 +51,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	if (!self->target || !self->special1)
 	{
 		self->special1 = 0;
 		self->SetState (self->SeeState);
-		return;
+		return 0;
 	}
 	mo = P_SpawnMissile (self, self->target, PClass::FindClass("BishopFX"));
 	if (mo != NULL)
@@ -63,6 +68,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack2)
 		mo->special2 = 16; // High word == x/y, Low word == z
 	}
 	self->special1--;
+	return 0;
 }
 
 //============================================================================
@@ -73,6 +79,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopAttack2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopMissileWeave)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t newX, newY;
 	int weaveXY, weaveZ;
 	int angle;
@@ -92,6 +100,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopMissileWeave)
 	weaveZ = (weaveZ + 2) & 63;
 	self->z += FloatBobOffsets[weaveZ];	
 	self->special2 = weaveZ + (weaveXY<<16);
+	return 0;
 }
 
 //============================================================================
@@ -102,14 +111,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopMissileWeave)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (pr_decide() < 220)
 	{
-		return;
+		return 0;
 	}
 	else
 	{
 		self->SetState (self->FindState ("Blur"));
-	}		
+	}
+	return 0;
 }
 
 //============================================================================
@@ -120,6 +132,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopDecide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopDoBlur)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1 = (pr_doblur() & 3) + 3; // Random number of blurs
 	if (pr_doblur() < 120)
 	{
@@ -134,6 +148,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopDoBlur)
 		P_ThrustMobj (self, self->angle, 11*FRACUNIT);
 	}
 	S_Sound (self, CHAN_BODY, "BishopBlur", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -144,6 +159,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopDoBlur)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopSpawnBlur)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	if (!--self->special1)
@@ -164,6 +181,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopSpawnBlur)
 	{
 		mo->angle = self->angle;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -174,9 +192,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopSpawnBlur)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->z -= FloatBobOffsets[self->special2] >> 1;
 	self->special2 = (self->special2 + 4) & 63;
 	self->z += FloatBobOffsets[self->special2] >> 1;
+	return 0;
 }
 
 //============================================================================
@@ -187,6 +208,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopChase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopPuff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = Spawn ("BishopPuff", self->x, self->y, self->z + 40*FRACUNIT, ALLOW_REPLACE);
@@ -194,6 +217,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopPuff)
 	{
 		mo->velz = FRACUNIT/2;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -204,12 +228,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopPuff)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BishopPainBlur)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	if (pr_pain() < 64)
 	{
 		self->SetState (self->FindState ("Blur"));
-		return;
+		return 0;
 	}
 	fixed_t x = self->x + (pr_pain.Random2()<<12);
 	fixed_t y = self->y + (pr_pain.Random2()<<12);
@@ -219,4 +245,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopPainBlur)
 	{
 		mo->angle = self->angle;
 	}
+	return 0;
 }

src/g_hexen/a_centaur.cpp

@@ -16,6 +16,8 @@ static FRandom pr_centaurdefend ("CentaurDefend");
 
 DEFINE_ACTION_FUNCTION(AActor, A_CentaurDefend)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FaceTarget (self);
 	if (self->CheckMeleeRange() && pr_centaurdefend() < 32)
 	{
@@ -24,4 +26,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_CentaurDefend)
 		self->flags2&=~(MF2_REFLECTIVE|MF2_INVULNERABLE);
 		self->SetState (self->MeleeState);
 	}
+	return 0;
 }

src/g_hexen/a_clericflame.cpp

@@ -69,20 +69,23 @@ void ACFlameMissile::Effect ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_CFlameAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, RUNTIME_CLASS(ACFlameMissile));
 	S_Sound (self, CHAN_WEAPON, "ClericFlameFire", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -93,11 +96,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlameAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CFlamePuff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
 	self->velx = 0;
 	self->vely = 0;
 	self->velz = 0;
 	S_Sound (self, CHAN_BODY, "ClericFlameExplode", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -108,6 +114,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlamePuff)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CFlameMissile)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 	int an, an90;
 	fixed_t dist;
@@ -148,6 +156,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlameMissile)
 		}
 		self->SetState (self->SpawnState);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -158,10 +167,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_CFlameMissile)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CFlameRotate)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int an;
 
 	an = (self->angle+ANG90)>>ANGLETOFINESHIFT;
 	self->velx = self->special1+FixedMul(FLAMEROTSPEED, finecosine[an]);
 	self->vely = self->special2+FixedMul(FLAMEROTSPEED, finesine[an]);
 	self->angle += ANG90/15;
+	return 0;
 }

src/g_hexen/a_clericholy.cpp

@@ -184,6 +184,8 @@ bool AHolySpirit::IsOkayToAttack (AActor *link)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int j;
 	int i;
 	AActor *mo;
@@ -229,6 +231,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack2)
 		}
 		SpawnSpiritTail (mo);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -261,24 +264,27 @@ void SpawnSpiritTail (AActor *spirit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 	AActor *linetarget;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	ACWeapWraithverge *weapon = static_cast<ACWeapWraithverge *> (self->player->ReadyWeapon);
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	AActor * missile = P_SpawnPlayerMissile (self, 0,0,0, PClass::FindClass ("HolyMissile"), self->angle, &linetarget);
 	if (missile != NULL) missile->tracer = linetarget;
 
 	weapon->CHolyCount = 3;
 	S_Sound (self, CHAN_WEAPON, "HolySymbolFire", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -289,6 +295,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolyPalette)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		ACWeapWraithverge *weapon = static_cast<ACWeapWraithverge *> (self->player->ReadyWeapon);
@@ -297,6 +305,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyPalette)
 			weapon->CHolyCount--;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -372,6 +381,8 @@ static void CHolyTailRemove (AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolyTail)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *parent;
 
 	parent = self->target;
@@ -379,7 +390,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyTail)
 	if (parent == NULL || parent->health <= 0)	// better check for health than current state - it's safer!
 	{ // Ghost removed, so remove all tail parts
 		CHolyTailRemove (self);
-		return;
+		return 0;
 	}
 	else
 	{
@@ -391,6 +402,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyTail)
 		}
 		CHolyTailFollow (self, 10*FRACUNIT);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -529,6 +541,8 @@ static void CHolyWeave (AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolySeek)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->health--;
 	if (self->health <= 0)
 	{
@@ -537,7 +551,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolySeek)
 		self->velz = 0;
 		self->SetState (self->FindState(NAME_Death));
 		self->tics -= pr_holyseek()&3;
-		return;
+		return 0;
 	}
 	if (self->tracer)
 	{
@@ -549,6 +563,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolySeek)
 		}
 	}
 	CHolyWeave (self);
+	return 0;
 }
 
 //============================================================================
@@ -559,6 +574,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolySeek)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CHolyCheckScream)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	CALL_ACTION(A_CHolySeek, self);
 	if (pr_checkscream() < 20)
 	{
@@ -568,6 +585,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyCheckScream)
 	{
 		CHolyFindTarget(self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -579,10 +597,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_CHolyCheckScream)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ClericAttack)
 {
-	if (!self->target) return;
+	PARAM_ACTION_PROLOGUE;
+
+	if (!self->target) return 0;
 
 	AActor * missile = P_SpawnMissileZ (self, self->z + 40*FRACUNIT, self->target, PClass::FindClass ("HolyMissile"));
 	if (missile != NULL) missile->tracer = NULL;	// No initial target
 	S_Sound (self, CHAN_WEAPON, "HolySymbolFire", 1, ATTN_NORM);
+	return 0;
 }
 

src/g_hexen/a_clericmace.cpp

@@ -17,6 +17,8 @@ static FRandom pr_maceatk ("CMaceAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_CMaceAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -26,7 +28,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CMaceAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	damage = 25+(pr_maceatk()&15);
@@ -60,5 +62,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_CMaceAttack)
 	slope = P_AimLineAttack (player->mo, angle, MELEERANGE, &linetarget);
 	P_LineAttack (player->mo, angle, MELEERANGE, slope, damage, NAME_Melee, PClass::FindClass ("HammerPuff"));
 macedone:
-	return;		
+	return 0;		
 }

src/g_hexen/a_clericstaff.cpp

@@ -46,6 +46,8 @@ int ACStaffMissile::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *pmo;
 	int damage;
 	int newLife;
@@ -57,7 +59,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheck)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 
@@ -107,6 +109,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheck)
 			break;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -117,19 +120,21 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheck)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CStaffAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	mo = P_SpawnPlayerMissile (self, RUNTIME_CLASS(ACStaffMissile), self->angle-(ANG45/15));
 	if (mo)
@@ -142,6 +147,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffAttack)
 		mo->special2 = 0;
 	}
 	S_Sound (self, CHAN_WEAPON, "ClericCStaffFire", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -152,6 +158,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CStaffMissileSlither)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t newX, newY;
 	int weaveXY;
 	int angle;
@@ -165,6 +173,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffMissileSlither)
 	newY += FixedMul(finesine[angle], FloatBobOffsets[weaveXY]);
 	P_TryMove (self, newX, newY, true);
 	self->special2 = weaveXY;
+	return 0;
 }
 
 //============================================================================
@@ -175,7 +184,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffMissileSlither)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CStaffInitBlink)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1 = (pr_blink()>>1)+20;
+	return 0;
 }
 
 //============================================================================
@@ -186,6 +198,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffInitBlink)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheckBlink)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player && self->player->ReadyWeapon)
 	{
 		if (!--self->special1)
@@ -198,4 +212,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffCheckBlink)
 			DoReadyWeapon(self);
 		}
 	}
+	return 0;
 }

src/g_hexen/a_dragon.cpp

@@ -164,6 +164,8 @@ static void DragonSeek (AActor *actor, angle_t thresh, angle_t turnMax)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonInitFlight)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	FActorIterator iterator (self->tid);
 
 	do
@@ -172,10 +174,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonInitFlight)
 		if (self->tracer == NULL)
 		{
 			self->SetState (self->SpawnState);
-			return;
+			return 0;
 		}
 	} while (self->tracer == self);
 	self->RemoveFromHash ();
+	return 0;
 }
 
 //============================================================================
@@ -186,6 +189,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonInitFlight)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonFlight)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 
 	DragonSeek (self, 4*ANGLE_1, 8*ANGLE_1);
@@ -194,7 +199,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFlight)
 		if(!(self->target->flags&MF_SHOOTABLE))
 		{ // target died
 			self->target = NULL;
-			return;
+			return 0;
 		}
 		angle = R_PointToAngle2(self->x, self->y, self->target->x,
 			self->target->y);
@@ -215,6 +220,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFlight)
 	{
 		P_LookForPlayers (self, true, NULL);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -225,6 +231,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFlight)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonFlap)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	CALL_ACTION(A_DragonFlight, self);
 	if (pr_dragonflap() < 240)
 	{
@@ -234,6 +242,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFlap)
 	{
 		self->PlayActiveSound ();
 	}
+	return 0;
 }
 
 //============================================================================
@@ -244,7 +253,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFlap)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonAttack)
 {
-	P_SpawnMissile (self, self->target, PClass::FindClass ("DragonFireball"));						
+	PARAM_ACTION_PROLOGUE;
+
+	P_SpawnMissile (self, self->target, PClass::FindClass ("DragonFireball"));
+	return 0;
 }
 
 //============================================================================
@@ -255,6 +267,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonFX2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 	int delay;
@@ -272,7 +286,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFX2)
 			mo->tics = delay+(pr_dragonfx2()&3)*i*2;
 			mo->target = self->target;
 		}
-	} 
+	}
+	return 0;
 }
 
 //============================================================================
@@ -283,11 +298,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonFX2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonPain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	CALL_ACTION(A_Pain, self);
 	if (!self->tracer)
 	{ // no destination spot yet
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -298,8 +316,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_DragonPain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DragonCheckCrash)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->z <= self->floorz)
 	{
 		self->SetState (self->FindState ("Crash"));
 	}
+	return 0;
 }

src/g_hexen/a_fighteraxe.cpp

@@ -70,11 +70,13 @@ FState *AFWeapAxe::GetAtkState (bool hold)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReady)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	if (player->ReadyWeapon->Ammo1->Amount)
 	{
@@ -84,6 +86,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReady)
 	{
 		DoReadyWeapon(self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -94,11 +97,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReady)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReadyG)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	if (player->ReadyWeapon->Ammo1->Amount <= 0)
 	{
@@ -108,6 +113,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReadyG)
 	{
 		DoReadyWeapon(self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -118,11 +124,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckReadyG)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUp)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	if (player->ReadyWeapon->Ammo1->Amount)
 	{
@@ -132,6 +140,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUp)
 	{
 		CALL_ACTION(A_Raise, self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -142,11 +151,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUp)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUpG)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	if (player->ReadyWeapon->Ammo1->Amount <= 0)
 	{
@@ -156,6 +167,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUpG)
 	{
 		CALL_ACTION(A_Raise, self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -166,16 +178,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckUpG)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckAtk)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	if (player->ReadyWeapon->Ammo1->Amount)
 	{
 		P_SetPsprite (player, ps_weapon, player->ReadyWeapon->FindState ("FireGlow"));
 	}
+	return 0;
 }
 
 //============================================================================
@@ -186,6 +201,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeCheckAtk)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FAxeAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	fixed_t power;
 	int damage;
@@ -199,7 +216,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FAxeAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AActor *pmo=player->mo;
 
@@ -271,6 +288,6 @@ axedone:
 			}
 		}
 	}
-	return;		
+	return 0;		
 }
 

src/g_hexen/a_fighterhammer.cpp

@@ -27,6 +27,8 @@ extern void AdjustPlayerAngle (AActor *pmo, AActor *linetarget);
 
 DEFINE_ACTION_FUNCTION(AActor, A_FHammerAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	fixed_t power;
@@ -37,7 +39,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FHammerAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AActor *pmo=player->mo;
 
@@ -91,7 +93,7 @@ hammerdone:
 	{ 
 		pmo->special1 = false;
 	}
-	return;		
+	return 0;		
 }
 
 //============================================================================
@@ -102,27 +104,30 @@ hammerdone:
 
 DEFINE_ACTION_FUNCTION(AActor, A_FHammerThrow)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	if (!player->mo->special1)
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire, false))
-			return;
+			return 0;
 	}
 	mo = P_SpawnPlayerMissile (player->mo, PClass::FindClass ("HammerMissile")); 
 	if (mo)
 	{
 		mo->special1 = 0;
-	}	
+	}
+	return 0;
 }

src/g_hexen/a_fighterplayer.cpp

@@ -134,6 +134,8 @@ void AdjustPlayerAngle (AActor *pmo, AActor *linetarget)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FPunchAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -145,7 +147,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FPunchAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	APlayerPawn *pmo = player->mo;
 
@@ -207,6 +209,6 @@ punchdone:
 		P_SetPsprite (player, ps_weapon, player->ReadyWeapon->FindState ("Fire2"));
 		S_Sound (pmo, CHAN_VOICE, "*fistgrunt", 1, ATTN_NORM);
 	}
-	return;		
+	return 0;		
 }
 

src/g_hexen/a_fighterquietus.cpp

@@ -63,10 +63,10 @@ bool AFighterWeaponPiece::TryPickup (AActor *&toucher)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DropWeaponPieces)
 {
-	ACTION_PARAM_START(3);
-	ACTION_PARAM_CLASS(p1, 0);
-	ACTION_PARAM_CLASS(p2, 1);
-	ACTION_PARAM_CLASS(p3, 2);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS(p1, AActor);
+	PARAM_CLASS(p2, AActor);
+	PARAM_CLASS(p3, AActor);
 
 	for (int i = 0, j = 0, fineang = 0; i < 3; ++i)
 	{
@@ -85,6 +85,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_DropWeaponPieces)
 			}
 		}
 	}
+	return 0;
 }
 
 
@@ -117,17 +118,19 @@ int AFSwordMissile::DoSpecialDamage(AActor *victim, AActor *source, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FSwordAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	P_SpawnPlayerMissile (self, 0, 0, -10*FRACUNIT, RUNTIME_CLASS(AFSwordMissile), self->angle+ANGLE_45/4);
 	P_SpawnPlayerMissile (self, 0, 0,  -5*FRACUNIT, RUNTIME_CLASS(AFSwordMissile), self->angle+ANGLE_45/8);
@@ -135,6 +138,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordAttack)
 	P_SpawnPlayerMissile (self, 0, 0,   5*FRACUNIT, RUNTIME_CLASS(AFSwordMissile), self->angle-ANGLE_45/8);
 	P_SpawnPlayerMissile (self, 0, 0,  10*FRACUNIT, RUNTIME_CLASS(AFSwordMissile), self->angle-ANGLE_45/4);
 	S_Sound (self, CHAN_WEAPON, "FighterSwordFire", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -145,6 +149,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FSwordFlames)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 
 	for (i = 1+(pr_fswordflame()&3); i; i--)
@@ -154,6 +160,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordFlames)
 		fixed_t z = self->z+((pr_fswordflame()-128)<<11);
 		Spawn ("FSwordFlame", x, y, z, ALLOW_REPLACE);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -164,7 +171,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_FSwordFlames)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FighterAttack)
 {
-	if (!self->target) return;
+	PARAM_ACTION_PROLOGUE;
+
+	if (!self->target) return 0;
 
 	angle_t angle = self->angle;
 
@@ -174,5 +183,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_FighterAttack)
 	P_SpawnMissileAngle (self, RUNTIME_CLASS(AFSwordMissile), angle-ANG45/8, 0);
 	P_SpawnMissileAngle (self, RUNTIME_CLASS(AFSwordMissile), angle-ANG45/4, 0);
 	S_Sound (self, CHAN_WEAPON, "FighterSwordFire", 1, ATTN_NORM);
+	return 0;
 }
 

src/g_hexen/a_firedemon.cpp

@@ -81,11 +81,14 @@ void A_FiredSpawnRock (AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FiredRocks)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FiredSpawnRock (self);
 	A_FiredSpawnRock (self);
 	A_FiredSpawnRock (self);
 	A_FiredSpawnRock (self);
 	A_FiredSpawnRock (self);
+	return 0;
 }
 
 //============================================================================
@@ -96,11 +99,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredRocks)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SmBounce)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// give some more velocity (x,y,&z)
 	self->z = self->floorz + FRACUNIT;
 	self->velz = (2*FRACUNIT) + (pr_smbounce() << 10);
 	self->velx = pr_smbounce()%3<<FRACBITS;
 	self->vely = pr_smbounce()%3<<FRACBITS;
+	return 0;
 }
 
 //============================================================================
@@ -111,10 +117,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SmBounce)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FiredAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 	AActor *mo = P_SpawnMissile (self, self->target, PClass::FindClass ("FireDemonMissile"));
 	if (mo) S_Sound (self, CHAN_BODY, "FireDemonAttack", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -125,6 +134,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int weaveindex = self->special1;
 	AActor *target = self->target;
 	angle_t ang;
@@ -146,7 +157,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 	if(!self->target || !(self->target->flags&MF_SHOOTABLE))
 	{	// Invalid target
 		P_LookForPlayers (self,true, NULL);
-		return;
+		return 0;
 	}
 
 	// Strafe
@@ -194,7 +205,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 		{
 			self->SetState (self->MissileState);
 			self->flags |= MF_JUSTATTACKED;
-			return;
+			return 0;
 		}
 	}
 	else
@@ -207,6 +218,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 	{
 		self->PlayActiveSound ();
 	}
+	return 0;
 }
 
 //============================================================================
@@ -217,6 +229,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredChase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FiredSplotch)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = Spawn ("FireDemonSplotch1", self->x, self->y, self->z, ALLOW_REPLACE);
@@ -233,4 +247,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_FiredSplotch)
 		mo->vely = (pr_firedemonsplotch() - 128) << 11;
 		mo->velz = (pr_firedemonsplotch() << 10) + FRACUNIT*3;
 	}
+	return 0;
 }

src/g_hexen/a_flechette.cpp

@@ -297,6 +297,8 @@ int APoisonCloud::DoSpecialDamage (AActor *victim, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	
 	mo = Spawn<APoisonCloud> (self->x, self->y, self->z+28*FRACUNIT, ALLOW_REPLACE);
@@ -304,6 +306,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagInit)
 	{
 		mo->target = self->target;
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -314,14 +317,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagInit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (--self->special1 <= 0)
 	{
 		self->SetState (self->FindState ("Death"));
 	}
 	else
 	{
-		return;
+		return 0;
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -332,12 +338,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagCheck)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagDamage)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int bobIndex;
 	
 	P_RadiusAttack (self, self->target, 4, 40, self->DamageType, true);
 	bobIndex = self->special2;
 	self->z += FloatBobOffsets[bobIndex]>>4;
 	self->special2 = (bobIndex+1)&63;
+	return 0;
 }
 
 //===========================================================================
@@ -348,10 +357,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonBagDamage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (--self->health <= 0)
 	{
 		self->SetState (self->FindState(NAME_Death));
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -362,6 +374,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] Check using actual velocity, although the velz < 2 check still stands
 	//if (abs(self->velx) < FRACUNIT*3/2 && abs(self->vely) < FRACUNIT*3/2
 	//	&& self->velz < 2*FRACUNIT)
@@ -376,4 +390,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckThrowBomb2)
 		self->flags &= ~MF_MISSILE;
 	}
 	CALL_ACTION(A_CheckThrowBomb, self);
+	return 0;
 }

src/g_hexen/a_fog.cpp

@@ -27,6 +27,8 @@ static FRandom pr_fogspawn ("FogSpawn");
 
 DEFINE_ACTION_FUNCTION(AActor, A_FogSpawn)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	static const char *fogs[3] =
 	{
 		"FogPatchSmall",
@@ -34,11 +36,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogSpawn)
 		"FogPatchLarge"
 	};
 
-	AActor *mo=NULL;
+	AActor *mo = NULL;
 	angle_t delta;
 
-	if (self->special1-- > 0) return;
-
+	if (self->special1-- > 0)
+	{
+		return 0;
+	}
 	self->special1 = self->args[2];		// Reset frequency count
 
 	mo = Spawn (fogs[pr_fogspawn()%3], self->x, self->y, self->z, ALLOW_REPLACE);
@@ -55,6 +59,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogSpawn)
 		mo->args[4] = 1;									// Set to moving
 		mo->special2 = pr_fogspawn()&63;
 	}
+	return 0;
 }
 
 //==========================================================================
@@ -65,16 +70,21 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogSpawn)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FogMove)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int speed = self->args[0]<<FRACBITS;
 	angle_t angle;
 	int weaveindex;
 
-	if (!(self->args[4])) return;
+	if (!self->args[4])
+	{
+		return 0;
+	}
 
 	if (self->args[3]-- <= 0)
 	{
 		self->SetStateNF (self->FindState(NAME_Death));
-		return;
+		return 0;
 	}
 
 	if ((self->args[3] % 4) == 0)
@@ -87,5 +97,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_FogMove)
 	angle = self->angle>>ANGLETOFINESHIFT;
 	self->velx = FixedMul(speed, finecosine[angle]);
 	self->vely = FixedMul(speed, finesine[angle]);
+	return 0;
 }
 

src/g_hexen/a_heresiarch.cpp

@@ -231,6 +231,8 @@ void ASorcBall1::DoFireSpell ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcSpinBalls)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	fixed_t z;
 
@@ -252,6 +254,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcSpinBalls)
 	if (mo) mo->target = self;
 	mo = Spawn("SorcBall3", self->x, self->y, z, NO_REPLACE);
 	if (mo) mo->target = self;
+	return 0;
 }
 
 
@@ -263,11 +266,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcSpinBalls)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] If no parent, then die instead of crashing
 	if (self->target == NULL)
 	{
 		self->SetState (self->FindState(NAME_Pain));
-		return;
+		return 0;
 	}
 
 	ASorcBall *actor;
@@ -287,7 +292,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 	if (actor->target->health <= 0)
 	{
 		actor->SetState (actor->FindState(NAME_Pain));
-		return;
+		return 0;
 	}
 
 	baseangle = (angle_t)parent->special1;
@@ -375,6 +380,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 	actor->SetOrigin (x, y, parent->z - parent->floorclip + parent->height);
 	actor->floorz = parent->floorz;
 	actor->ceilingz = parent->ceilingz;
+	return 0;
 }
 
 //============================================================================
@@ -387,8 +393,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallOrbit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpeedBalls)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->args[3] = SORC_ACCELERATE;				// speed mode
 	self->args[2] = SORCBALL_TERMINAL_SPEED;		// target speed
+	return 0;
 }
 
 
@@ -682,8 +691,11 @@ void A_SorcOffense2(AActor *actor)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcBossAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->args[3] = SORC_ACCELERATE;
 	self->args[2] = SORCBALL_INITIAL_SPEED;
+	return 0;
 }
 
 //============================================================================
@@ -696,6 +708,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBossAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnFizzle)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t x,y,z;
 	fixed_t dist = 5*FRACUNIT;
 	angle_t angle = self->angle >> ANGLETOFINESHIFT;
@@ -718,6 +732,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnFizzle)
 			mo->velz = FRACUNIT*2;
 		}
 	}
+	return 0;
 }
 
 
@@ -731,8 +746,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnFizzle)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcFX1Seek)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_DoBounceCheck (self, "SorcererHeadScream");
 	P_SeekerMissile (self,ANGLE_1*2,ANGLE_1*6);
+	return 0;
 }
 
 
@@ -754,6 +772,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX1Seek)
 // Split ball in two
 DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Split)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = Spawn(self->GetClass(), self->x, self->y, self->z, NO_REPLACE);
@@ -773,6 +793,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Split)
 		mo->SetState (mo->FindState("Orbit"));
 	}
 	self->Destroy ();
+	return 0;
 }
 
 //============================================================================
@@ -785,6 +806,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Split)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	fixed_t x,y,z;
 	AActor *parent = self->target;
@@ -793,7 +816,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 	if (parent == NULL)
 	{
 		self->Destroy();
-		return;
+		return 0;
 	}
 
 	fixed_t dist = parent->radius;
@@ -841,6 +864,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 	self->SetOrigin (x, y, z);
 	self->floorz = parent->floorz;
 	self->ceilingz = parent->ceilingz;
+	return 0;
 }
 
 //============================================================================
@@ -853,6 +877,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX2Orbit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnBishop)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	mo = Spawn("Bishop", self->x, self->y, self->z, ALLOW_REPLACE);
 	if (mo)
@@ -869,6 +895,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnBishop)
 		}
 	}
 	self->Destroy ();
+	return 0;
 }
 
 //============================================================================
@@ -879,8 +906,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnBishop)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcererBishopEntry)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	Spawn("SorcFX3Explosion", self->x, self->y, self->z, ALLOW_REPLACE);
 	S_Sound (self, CHAN_VOICE, self->SeeSound, 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -893,10 +923,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcererBishopEntry)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcFX4Check)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->special2-- <= 0)
 	{
 		self->SetState (self->FindState(NAME_Death));
 	}
+	return 0;
 }
 
 //============================================================================
@@ -909,6 +942,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcFX4Check)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SorcBallPop)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "SorcererBallPop", 1, ATTN_NONE);
 	self->flags &= ~MF_NOGRAVITY;
 	self->gravity = FRACUNIT/8;
@@ -918,6 +953,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SorcBallPop)
 	self->special2 = 4*FRACUNIT;		// Initial bounce factor
 	self->args[4] = BOUNCE_TIME_UNIT;	// Bounce time unit
 	self->args[3] = 5;					// Bounce time in seconds
+	return 0;
 }
 
 //============================================================================
@@ -950,5 +986,8 @@ void A_DoBounceCheck (AActor *self, const char *sound)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BounceCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_DoBounceCheck (self, "SorcererBigBallExplode");
+	return 0;
 }

src/g_hexen/a_hexenspecialdecs.cpp

@@ -55,6 +55,8 @@ void APottery1::HitFloor ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_PotteryExplode)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo = NULL;
 	int i;
 
@@ -79,6 +81,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryExplode)
 				self->x, self->y, self->z, ALLOW_REPLACE);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -89,8 +92,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryExplode)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PotteryChooseBit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->SetState (self->FindState(NAME_Death) + 1 + 2*(pr_bit()%5));
 	self->tics = 256+(pr_bit()<<1);
+	return 0;
 }
 
 //============================================================================
@@ -101,6 +107,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryChooseBit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PotteryCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 
 	for(i = 0; i < MAXPLAYERS; i++)
@@ -112,10 +120,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_PotteryCheck)
 				pmo->y, self->x, self->y) - pmo->angle) <= ANGLE_45))
 			{ // Previous state (pottery bit waiting state)
 				self->SetState (self->state - 1);
-				return;
+				return 0;
 			}
 		}
-	}		
+	}
+	return 0;
 }
 
 // Lynched corpse (no heart) ------------------------------------------------
@@ -143,10 +152,13 @@ void AZCorpseLynchedNoHeart::PostBeginPlay ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_CorpseBloodDrip)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (pr_drip() <= 128)
 	{
 		Spawn ("CorpseBloodDrip", self->x, self->y, self->z + self->height/2, ALLOW_REPLACE);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -157,6 +169,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseBloodDrip)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CorpseExplode)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 
@@ -182,6 +196,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseExplode)
 	}
 	S_Sound (self, CHAN_BODY, self->DeathSound, 1, ATTN_IDLE);
 	self->Destroy ();
+	return 0;
 }
 
 //============================================================================
@@ -192,6 +207,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CorpseExplode)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LeafSpawn)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 
@@ -208,6 +225,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafSpawn)
 			mo->special1 = 0;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -218,10 +236,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafSpawn)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LeafThrust)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (pr_leafthrust() <= 96)
 	{
 		self->velz += (pr_leafthrust()<<9)+FRACUNIT;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -232,11 +253,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafThrust)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LeafCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special1++;
 	if (self->special1 >= 20)
 	{
 		self->SetState (NULL);
-		return;
+		return 0;
 	}
 	angle_t ang = self->target ? self->target->angle : self->angle;
 	if (pr_leafcheck() > 64)
@@ -245,12 +268,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafCheck)
 		{
 			P_ThrustMobj (self, ang, (pr_leafcheck()<<9)+FRACUNIT);
 		}
-		return;
+		return 0;
 	}
 	self->SetState (self->SpawnState + 7);
 	self->velz = (pr_leafcheck()<<9)+FRACUNIT;
 	P_ThrustMobj (self, ang, (pr_leafcheck()<<9)+2*FRACUNIT);
 	self->flags |= MF_MISSILE;
+	return 0;
 }
 
 //===========================================================================
@@ -261,7 +285,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_LeafCheck)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PoisonShroom)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->tics = 128+(pr_shroom()<<1);
+	return 0;
 }
 
 //===========================================================================
@@ -272,6 +299,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_PoisonShroom)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SoAExplode)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 
@@ -299,6 +328,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SoAExplode)
 	}
 	S_Sound (self, CHAN_BODY, self->DeathSound, 1, ATTN_NORM);
 	self->Destroy ();
+	return 0;
 }
 
 // Bell ---------------------------------------------------------------------
@@ -328,6 +358,8 @@ void AZBell::Activate (AActor *activator)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BellReset1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_NOGRAVITY;
 	self->height <<= 2;
 	if (self->special)
@@ -336,6 +368,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_BellReset1)
 			self->args[1], self->args[2], self->args[3], self->args[4]);
 		self->special = 0;
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -346,8 +379,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_BellReset1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BellReset2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_SHOOTABLE;
 	self->flags &= ~MF_CORPSE;
 	self->health = 5;
+	return 0;
 }
 

src/g_hexen/a_iceguy.cpp

@@ -26,6 +26,8 @@ static const char *WispTypes[2] =
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceGuyLook)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t dist;
 	fixed_t an;
 
@@ -40,6 +42,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyLook)
 			self->y+FixedMul(dist, finesine[an]),
 			self->z+60*FRACUNIT, ALLOW_REPLACE);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -50,11 +53,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyLook)
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceGuyChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t dist;
 	fixed_t an;
 	AActor *mo;
 
-	A_Chase (self);
+	A_Chase (stack, self);
 	if (pr_iceguychase() < 128)
 	{
 		dist = ((pr_iceguychase()-128)*self->radius)>>7;
@@ -72,6 +77,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyChase)
 			mo->target = self;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -82,11 +88,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyChase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceGuyAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t an;
 
 	if(!self->target) 
 	{
-		return;
+		return 0;
 	}
 	an = (self->angle+ANG90)>>ANGLETOFINESHIFT;
 	P_SpawnMissileXYZ(self->x+FixedMul(self->radius>>1,
@@ -99,6 +107,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyAttack)
 		finesine[an]), self->z+40*FRACUNIT, self, self->target,
 		PClass::FindClass ("IceGuyFX"));
 	S_Sound (self, CHAN_WEAPON, self->AttackSound, 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -109,11 +118,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceGuyDie)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->velx = 0;
 	self->vely = 0;
 	self->velz = 0;
 	self->height = self->GetDefault()->height;
 	CALL_ACTION(A_FreezeDeathChunks, self);
+	return 0;
 }
 
 //============================================================================
@@ -124,6 +136,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyDie)
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceGuyMissileExplode)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 
@@ -136,5 +150,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceGuyMissileExplode)
 			mo->target = self->target;
 		}
 	}
+	return 0;
 }
 

src/g_hexen/a_korax.cpp

@@ -89,6 +89,8 @@ extern void SpawnSpiritTail (AActor *spirit);
 
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *spot;
 
 	if ((!self->special2) && (self->health <= (self->SpawnHealth()/2)))
@@ -103,10 +105,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 		P_StartScript (self, NULL, 249, NULL, 0, 0, 0, 0, 0, false);
 		self->special2 = 1;	// Don't run again
 
-		return;
+		return 0;
 	}
 
-	if (!self->target) return;
+	if (self->target == NULL)
+	{
+		return 0;
+	}
 	if (pr_koraxchase()<30)
 	{
 		self->SetState (self->MissileState);
@@ -140,6 +145,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 			}
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -150,6 +156,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxChase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxBonePop)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int i;
 
@@ -161,6 +169,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxBonePop)
 	}
 
 	P_StartScript (self, NULL, 255, NULL, 0, 0, 0, 0, false, false);		// Death script
+	return 0;
 }
 
 //============================================================================
@@ -190,6 +199,8 @@ void KSpiritInit (AActor *spirit, AActor *korax)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (pr_koraxdecide()<220)
 	{
 		self->SetState (self->FindState("Attack"));
@@ -198,6 +209,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxDecide)
 	{
 		self->SetState (self->FindState("Command"));
 	}
+	return 0;
 }
 
 //============================================================================
@@ -208,6 +220,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxDecide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxMissile)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	static const struct { const char *type, *sound; } choices[6] =
 	{
 		{ "WraithFX1", "WraithMissileFire" },
@@ -236,6 +250,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxMissile)
 	{
 		KoraxFire (self, info, i);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -248,6 +263,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxMissile)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KoraxCommand)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t x,y,z;
 	angle_t ang;
 	int numcommands;
@@ -272,6 +289,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KoraxCommand)
 
 	P_StartScript (self, NULL, 250+(pr_koraxcommand()%numcommands),
 		NULL, 0, 0, 0, 0, false, false);
+	return 0;
 }
 
 //============================================================================
@@ -329,6 +347,8 @@ void KoraxFire (AActor *actor, const PClass *type, int arm)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KSpiritWeave)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t newX, newY;
 	int weaveXY, weaveZ;
 	int angle;
@@ -350,6 +370,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KSpiritWeave)
 	weaveZ = (weaveZ+(pr_kspiritweave()%5))&63;
 	self->z += FloatBobOffsets[weaveZ]<<1;	
 	self->special2 = weaveZ+(weaveXY<<16);
+	return 0;
 }
 
 //============================================================================
@@ -430,6 +451,8 @@ void A_KSpiritSeeker (AActor *actor, angle_t thresh, angle_t turnMax)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KSpiritRoam)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->health-- <= 0)
 	{
 		S_Sound (self, CHAN_VOICE, "SpiritDie", 1, ATTN_NORM);
@@ -448,6 +471,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KSpiritRoam)
 			S_Sound (self, CHAN_VOICE, "SpiritActive", 1, ATTN_NONE);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -458,11 +482,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_KSpiritRoam)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KBolt)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// Countdown lifetime
 	if (self->special1-- <= 0)
 	{
 		self->Destroy ();
 	}
+	return 0;
 }
 
 //============================================================================
@@ -473,6 +500,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_KBolt)
 
 DEFINE_ACTION_FUNCTION(AActor, A_KBoltRaise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	fixed_t z;
 
@@ -491,6 +520,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KBoltRaise)
 	{
 		// Maybe cap it off here
 	}
+	return 0;
 }
 
 //============================================================================

src/g_hexen/a_magecone.cpp

@@ -51,6 +51,8 @@ int AFrostMissile::DoSpecialDamage (AActor *victim, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireConePL1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -62,14 +64,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireConePL1)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	S_Sound (self, CHAN_WEAPON, "MageShardsFire", 1, ATTN_NORM);
 
@@ -99,6 +101,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireConePL1)
 			mo->args[0] = 3;		// Mark Initial shard as super damage
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -109,11 +112,16 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireConePL1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int spawndir = self->special1;
 	int spermcount = self->special2;
 
-	if (spermcount <= 0) return;				// No sperm left
+	if (spermcount <= 0)
+	{
+		return 0;				// No sperm left
+	}
 	self->special2 = 0;
 	spermcount--;
 
@@ -173,4 +181,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShedShard)
 			mo->args[0] = (spermcount==3)?2:0;
 		}
 	}
+	return 0;
 }

src/g_hexen/a_magelightning.cpp

@@ -126,11 +126,14 @@ int ALightningZap::SpecialMissileHit (AActor *thing)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightningReady)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	DoReadyWeapon(self);
 	if (pr_lightningready() < 160)
 	{
 		S_Sound (self, CHAN_WEAPON, "MageLightningReady", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -141,6 +144,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningReady)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightningClip)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *cMo;
 	AActor *target = NULL;
 	int zigZag;
@@ -149,7 +154,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningClip)
 	{
 		if (self->lastenemy == NULL)
 		{
-			return;
+			return 0;
 		}
 		self->z = self->floorz;
 		target = self->lastenemy->tracer;
@@ -196,6 +201,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningClip)
 			P_ThrustMobj (self, self->angle, self->Speed>>1);
 		}
 	}
+	return 0;
 }
 
 
@@ -207,6 +213,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningClip)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightningZap)
 {
+	PARAM_ACTION_PROLOGUE;
 
 	const PClass *lightning=PClass::FindClass((ENamedName) self->GetClass()->Meta.GetMetaInt (ACMETA_MissileName, NAME_None));
 	if (lightning == NULL) lightning = PClass::FindClass("LightningZap");
@@ -219,7 +226,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningZap)
 	if (self->health <= 0)
 	{
 		self->SetState (self->FindState(NAME_Death));
-		return;
+		return 0;
 	}
 	if (self->flags3 & MF3_FLOORHUGGER)
 	{
@@ -251,6 +258,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningZap)
 	{
 		S_Sound (self, CHAN_BODY, self->ActiveSound, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -261,9 +269,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningZap)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MLightningAttack)
 {
-    ACTION_PARAM_START(2);
-    ACTION_PARAM_CLASS(floor, 0);
-    ACTION_PARAM_CLASS(ceiling, 1);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(floor, AActor)		{ floor = PClass::FindClass("LightningFloor"); }
+	PARAM_CLASS_OPT(ceiling, AActor)	{ ceiling = PClass::FindClass("LightningCeiling"); }
 
 	AActor *fmo, *cmo;
 
@@ -291,6 +299,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MLightningAttack)
 			weapon->DepleteAmmo (weapon->bAltFire);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -301,6 +310,8 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_MLightningAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ZapMimic)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = self->lastenemy;
@@ -316,6 +327,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ZapMimic)
 			self->vely = mo->vely;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -326,7 +338,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_ZapMimic)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LastZap)
 {
-	const PClass *lightning=PClass::FindClass((ENamedName) self->GetClass()->Meta.GetMetaInt (ACMETA_MissileName, NAME_None));
+	PARAM_ACTION_PROLOGUE;
+
+	const PClass *lightning = PClass::FindClass(ENamedName(self->GetClass()->Meta.GetMetaInt(ACMETA_MissileName, NAME_None)));
 	if (lightning == NULL) lightning = PClass::FindClass("LightningZap");
 
 	AActor *mo;
@@ -338,6 +352,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LastZap)
 		mo->velz = 40*FRACUNIT;
 		mo->Damage = 0;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -348,6 +363,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_LastZap)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightningRemove)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = self->lastenemy;
@@ -356,4 +373,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightningRemove)
 		mo->lastenemy = NULL;
 		P_ExplodeMissile (mo, NULL, NULL);
 	}
+	return 0;
 }

src/g_hexen/a_magestaff.cpp

@@ -179,20 +179,22 @@ void MStaffSpawn (AActor *pmo, angle_t angle)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MStaffAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	player_t *player;
 	AActor *linetarget;
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	AMWeapBloodscourge *weapon = static_cast<AMWeapBloodscourge *> (self->player->ReadyWeapon);
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 	angle = self->angle;
 	
@@ -211,6 +213,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MStaffAttack)
 	MStaffSpawn (self, angle+ANGLE_1*5);
 	S_Sound (self, CHAN_WEAPON, "MageStaffFire", 1, ATTN_NORM);
 	weapon->MStaffCount = 3;
+	return 0;
 }
 
 //============================================================================
@@ -221,6 +224,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MStaffAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MStaffPalette)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		AMWeapBloodscourge *weapon = static_cast<AMWeapBloodscourge *> (self->player->ReadyWeapon);
@@ -229,6 +234,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MStaffPalette)
 			weapon->MStaffCount--;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -239,11 +245,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_MStaffPalette)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MStaffTrack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if ((self->tracer == 0) && (pr_mstafftrack()<50))
 	{
 		self->tracer = P_RoughMonsterSearch (self, 10);
 	}
 	P_SeekerMissile (self, ANGLE_1*2, ANGLE_1*10);
+	return 0;
 }
 
 //============================================================================
@@ -299,13 +308,17 @@ void MStaffSpawn2 (AActor *actor, angle_t angle)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MageAttack)
 {
-	if (!self->target) return;
+	PARAM_ACTION_PROLOGUE;
 
+	if (self->target == NULL)
+	{
+		return 0;
+	}
 	angle_t angle;
 	angle = self->angle;
 	MStaffSpawn2 (self, angle);
 	MStaffSpawn2 (self, angle-ANGLE_1*5);
 	MStaffSpawn2 (self, angle+ANGLE_1*5);
 	S_Sound (self, CHAN_WEAPON, "MageStaffFire", 1, ATTN_NORM);
+	return 0;
 }
-

src/g_hexen/a_magewand.cpp

@@ -51,8 +51,11 @@ void AMageWandMissile::Effect ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_MWandAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 
 	mo = P_SpawnPlayerMissile (self, RUNTIME_CLASS(AMageWandMissile));
 	S_Sound (self, CHAN_WEAPON, "MageWandFire", 1, ATTN_NORM);
+	return 0;
 }

src/g_hexen/a_pig.cpp

@@ -60,6 +60,8 @@ void APigPlayer::MorphPlayerThink ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_SnoutAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t angle;
 	int damage;
 	int slope;
@@ -69,7 +71,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SnoutAttack)
 
 	if (NULL == (player = self->player))
 	{
-		return;
+		return 0;
 	}
 
 	damage = 3+(pr_snoutattack()&3);
@@ -85,6 +87,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SnoutAttack)
 			S_Sound(player->mo, CHAN_VOICE, "PigAttack", 1, ATTN_NORM);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -95,9 +98,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_SnoutAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PigPain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	CALL_ACTION(A_Pain, self);
 	if (self->z <= self->floorz)
 	{
 		self->velz = FRACUNIT*7/2;
 	}
+	return 0;
 }

src/g_hexen/a_serpent.cpp

@@ -25,8 +25,11 @@ static FRandom pr_delaygib ("DelayGib");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentUnHide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
 	self->floorclip = 24*FRACUNIT;
+	return 0;
 }
 
 //============================================================================
@@ -37,8 +40,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentUnHide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentHide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags |= RF_INVISIBLE;
 	self->floorclip = 0;
+	return 0;
 }
 
 //============================================================================
@@ -50,7 +56,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentHide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentRaiseHump)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->floorclip -= 4*FRACUNIT;
+	return 0;
 }
 
 //============================================================================
@@ -61,7 +70,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentRaiseHump)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentLowerHump)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->floorclip += 4*FRACUNIT;
+	return 0;
 }
 
 //============================================================================
@@ -74,21 +86,23 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentLowerHump)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentHumpDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->MissileState != NULL)
 	{
 		if (pr_serpenthump() > 30)
 		{
-			return;
+			return 0;
 		}
 		else if (pr_serpenthump() < 40)
 		{ // Missile attack
 			self->SetState (self->MeleeState);
-			return;
+			return 0;
 		}
 	}
 	else if (pr_serpenthump() > 3)
 	{
-		return;
+		return 0;
 	}
 	if (!self->CheckMeleeRange ())
 	{ // The hump shouldn't occur when within melee range
@@ -102,6 +116,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentHumpDecide)
 			S_Sound (self, CHAN_BODY, "SerpentActive", 1, ATTN_NORM);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -112,16 +127,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentHumpDecide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentCheckForAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	if (self->MissileState != NULL)
 	{
 		if (!self->CheckMeleeRange ())
 		{
 			self->SetState (self->FindState ("Attack"));
-			return;
+			return 0;
 		}
 	}
 	if (P_CheckMeleeRange2 (self))
@@ -139,6 +156,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentCheckForAttack)
 			self->SetState (self->FindState ("Attack"));
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -149,14 +167,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentCheckForAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentChooseAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target || self->CheckMeleeRange())
 	{
-		return;
+		return 0;
 	}
 	if (self->MissileState != NULL)
 	{
 		self->SetState (self->MissileState);
 	}
+	return 0;
 }
 	
 //============================================================================
@@ -167,9 +188,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentChooseAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentMeleeAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	if (self->CheckMeleeRange ())
 	{
@@ -182,6 +205,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentMeleeAttack)
 	{
 		CALL_ACTION(A_SerpentCheckForAttack, self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -192,6 +216,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentMeleeAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentSpawnGibs)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	static const char *GibTypes[] =
 	{
@@ -213,6 +239,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentSpawnGibs)
 			mo->floorclip = 6*FRACUNIT;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -223,7 +250,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentSpawnGibs)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FloatGib)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->floorclip -= FRACUNIT;
+	return 0;
 }
 
 //============================================================================
@@ -234,7 +264,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_FloatGib)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SinkGib)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->floorclip += FRACUNIT;
+	return 0;
 }
 
 //============================================================================
@@ -245,7 +278,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SinkGib)
 
 DEFINE_ACTION_FUNCTION(AActor, A_DelayGib)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->tics -= pr_delaygib()>>2;
+	return 0;
 }
 
 //============================================================================
@@ -256,6 +292,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_DelayGib)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SerpentHeadCheck)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->z <= self->floorz)
 	{
 		if (Terrains[P_GetThingFloorType(self)].IsLiquid)
@@ -268,5 +306,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_SerpentHeadCheck)
 			self->SetState (self->FindState(NAME_Death));
 		}
 	}
+	return 0;
 }
 

src/g_hexen/a_spike.cpp

@@ -78,16 +78,21 @@ void AThrustFloor::Deactivate (AActor *activator)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ThrustInitUp)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special2 = 5;	// Raise speed
 	self->args[0] = 1;		// Mark as up
 	self->floorclip = 0;
 	self->flags = MF_SOLID;
 	self->flags2 = MF2_NOTELEPORT|MF2_FLOORCLIP;
 	self->special1 = 0L;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_ThrustInitDn)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->special2 = 5;	// Raise speed
 	self->args[0] = 0;		// Mark as down
 	self->floorclip = self->GetDefault()->height;
@@ -96,11 +101,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustInitDn)
 	self->renderflags = RF_INVISIBLE;
 	static_cast<AThrustFloor *>(self)->DirtClump =
 		Spawn("DirtClump", self->x, self->y, self->z, ALLOW_REPLACE);
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_ThrustRaise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AThrustFloor *actor = static_cast<AThrustFloor *>(self);
 
 	if (A_RaiseMobj (actor, self->special2*FRACUNIT))
@@ -123,10 +131,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustRaise)
 	if (pr_thrustraise()<40)
 		P_SpawnDirt (actor, actor->radius);
 	actor->special2++;							// Increase raise speed
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_ThrustLower)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (A_SinkMobj (self, 6*FRACUNIT))
 	{
 		self->args[0] = 0;
@@ -135,10 +146,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustLower)
 		else
 			self->SetStateNF (self->FindState ("ThrustInit1"));
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_ThrustImpale)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *thing;
 	FBlockThingsIterator it(FBoundingBox(self->x, self->y, self->radius));
 	while ((thing = it.Next()))
@@ -158,5 +172,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_ThrustImpale)
 		P_TraceBleed (10001, thing);
 		self->args[1] = 1;	// Mark thrust thing as bloody
 	}
+	return 0;
 }
 

src/g_hexen/a_summon.cpp

@@ -49,6 +49,8 @@ bool AArtiDarkServant::Use (bool pickup)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Summon)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AMinotaurFriend *mo;
 
 	mo = Spawn<AMinotaurFriend> (self->x, self->y, self->z, ALLOW_REPLACE);
@@ -59,7 +61,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Summon)
 			mo->Destroy ();
 			AActor *arti = Spawn<AArtiDarkServant> (self->x, self->y, self->z, ALLOW_REPLACE);
 			if (arti) arti->flags |= MF_DROPPED;
-			return;
+			return 0;
 		}
 
 		mo->StartTime = level.maptime;
@@ -82,4 +84,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_Summon)
 		Spawn ("MinotaurSmoke", self->x, self->y, self->z, ALLOW_REPLACE);
 		S_Sound (self, CHAN_VOICE, mo->ActiveSound, 1, ATTN_NORM);
 	}
+	return 0;
 }

src/g_hexen/a_teleportother.cpp

@@ -65,30 +65,41 @@ static void TeloSpawn (AActor *source, const char *type)
 
 DEFINE_ACTION_FUNCTION(AActor, A_TeloSpawnA)
 {
+	PARAM_ACTION_PROLOGUE;
 	TeloSpawn (self, "TelOtherFX2");
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_TeloSpawnB)
 {
+	PARAM_ACTION_PROLOGUE;
 	TeloSpawn (self, "TelOtherFX3");
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_TeloSpawnC)
 {
+	PARAM_ACTION_PROLOGUE;
 	TeloSpawn (self, "TelOtherFX4");
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_TeloSpawnD)
 {
+	PARAM_ACTION_PROLOGUE;
 	TeloSpawn (self, "TelOtherFX5");
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CheckTeleRing)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->special1-- <= 0)
 	{
 		self->SetState (self->FindState(NAME_Death));
 	}
+	return 0;
 }
 
 //===========================================================================

src/g_hexen/a_wraith.cpp

@@ -29,6 +29,8 @@ static FRandom pr_wraithfx4 ("WraithFX4");
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->z += 48<<FRACBITS;
 
 	// [RH] Make sure the wraith didn't go into the ceiling
@@ -38,6 +40,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithInit)
 	}
 
 	self->special1 = 0;			// index into floatbob
+	return 0;
 }
 
 //============================================================================
@@ -48,11 +51,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithInit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithRaiseInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
 	self->flags2 &= ~MF2_NONSHOOTABLE;
 	self->flags3 &= ~MF3_DONTBLAST;
 	self->flags |= MF_SHOOTABLE|MF_SOLID;
 	self->floorclip = self->height;
+	return 0;
 }
 
 //============================================================================
@@ -63,6 +69,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithRaiseInit)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithRaise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (A_RaiseMobj (self, 2*FRACUNIT))
 	{
 		// Reached it's target height
@@ -75,6 +83,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithRaise)
 	}
 
 	P_SpawnDirt (self, self->radius);
+	return 0;
 }
 
 //============================================================================
@@ -85,6 +94,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithRaise)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithMelee)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int amount;
 
 	// Steal health from target and give to self
@@ -94,6 +105,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithMelee)
 		P_DamageMobj (self->target, self, self, amount, NAME_Melee);
 		self->health += amount;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -104,6 +116,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithMelee)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithFX2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	angle_t angle;
 	int i;
@@ -130,6 +144,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithFX2)
 			mo->floorclip = 10*FRACUNIT;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -142,6 +157,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithFX2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithFX3)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	int numdropped = pr_wraithfx3()%15;
 
@@ -156,6 +173,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithFX3)
 			mo->target = self;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -225,6 +243,8 @@ void A_WraithFX4 (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WraithChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int weaveindex = self->special1;
 	self->z += FloatBobOffsets[weaveindex];
 	self->special1 = (weaveindex+2)&63;
@@ -233,6 +253,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WraithChase)
 //		P_SetMobjState(self, S_WRAITH_RAISE2);
 //		return;
 //	}
-	A_Chase (self);
+	A_Chase (stack, self);
 	A_WraithFX4 (self);
+	return 0;
 }

src/g_raven/a_minotaur.cpp

@@ -174,18 +174,23 @@ bool AMinotaurFriend::OkayToSwitchTarget (AActor *other)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (Wads.CheckNumForName ("MNTRF1", ns_sprites) < 0 &&
 		Wads.CheckNumForName ("MNTRF0", ns_sprites) < 0)
 		self->SetState(self->FindState ("FadeOut"));
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player;
 
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_WEAPON, "minotaur/melee", 1, ATTN_NORM);
 	if (self->CheckMeleeRange())
@@ -199,6 +204,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk1)
 			player->deltaviewheight = -16*FRACUNIT;
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -213,6 +219,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	bool friendly = !!(self->flags5 & MF5_SUMMONEDMONSTER);
 	angle_t angle;
 	AActor *target;
@@ -221,7 +229,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 	target = self->target;
 	if (!target)
 	{
-		return;
+		return 0;
 	}
 	if (!friendly)
 	{
@@ -260,6 +268,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 		// Don't need to call P_SetMobjState because the current state
 		// falls through to the swing attack
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -270,10 +279,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurDecide)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurCharge)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *puff;
 
-	if (!self->target) return;
-
+	if (self->target == NULL)
+	{
+		return 0;
+	}
 	if (self->special1 > 0)
 	{
 		const PClass *type;
@@ -296,6 +309,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurCharge)
 		self->flags2 &= ~MF2_INVULNERABLE;
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -308,15 +322,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurCharge)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	angle_t angle;
 	fixed_t velz;
 	fixed_t z;
 	bool friendly = !!(self->flags5 & MF5_SUMMONEDMONSTER);
 
-	if (!self->target)
+	if (self->target == NULL)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_WEAPON, "minotaur/attack2", 1, ATTN_NORM);
 	if (self->CheckMeleeRange())
@@ -325,7 +341,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk2)
 		damage = pr_atk.HitDice (friendly ? 3 : 5);
 		P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 		P_TraceBleed (damage, self->target, self);
-		return;
+		return 0;
 	}
 	z = self->z + 40*FRACUNIT;
 	const PClass *fx = PClass::FindClass("MinotaurFX1");
@@ -343,6 +359,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk2)
 			P_SpawnMissileAngleZ (self, z, fx, angle+(ANG45/16), velz);
 		}
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -355,13 +372,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk3)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	player_t *player;
 	bool friendly = !!(self->flags5 & MF5_SUMMONEDMONSTER);
 
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_VOICE, "minotaur/attack3", 1, ATTN_NORM);
 	if (self->CheckMeleeRange())
@@ -398,6 +417,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk3)
 		self->SetState (self->FindState ("HammerLoop"));
 		self->special2 = 1;
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -408,6 +428,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurAtk3)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MntrFloorFire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *mo;
 	fixed_t x, y;
 
@@ -418,6 +440,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MntrFloorFire)
 	mo->target = self->target;
 	mo->velx = 1; // Force block checking
 	P_CheckMissileSpawn (mo);
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -464,6 +487,8 @@ void P_MinotaurSlam (AActor *source, AActor *target)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurRoam)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// In case pain caused him to skip his fade in.
 	self->RenderStyle = STYLE_Normal;
 
@@ -474,7 +499,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurRoam)
 		if (self1->StartTime >= 0 && (level.maptime - self1->StartTime) >= MAULATORTICS)
 		{
 			P_DamageMobj (self1, NULL, NULL, TELEFRAG_DAMAGE, NAME_None);
-			return;
+			return 0;
 		}
 	}
 
@@ -496,6 +521,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurRoam)
 			self->movedir = (self->movedir+7)%8;
 		FaceMovementDirection (self);
 	}
+	return 0;
 }
 
 
@@ -509,10 +535,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurRoam)
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurLook)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->IsKindOf(RUNTIME_CLASS(AMinotaurFriend)))
 	{
 		CALL_ACTION(A_Look, self);
-		return;
+		return 0;
 	}
 
 	AActor *mo = NULL;
@@ -573,14 +601,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurLook)
 	{
 		self->SetStateNF (self->FindState ("Roam"));
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_MinotaurChase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->IsKindOf(RUNTIME_CLASS(AMinotaurFriend)))
 	{
-		A_Chase (self);
-		return;
+		A_Chase (stack, self);
+		return 0;
 	}
 
 	AMinotaurFriend *self1 = static_cast<AMinotaurFriend *> (self);
@@ -591,7 +622,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurChase)
 	if (self1->StartTime >= 0 && (level.maptime - self1->StartTime) >= MAULATORTICS)
 	{
 		P_DamageMobj (self1, NULL, NULL, TELEFRAG_DAMAGE, NAME_None);
-		return;
+		return 0;
 	}
 
 	if (pr_minotaurchase() < 30)
@@ -601,7 +632,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurChase)
 		!(self1->target->flags&MF_SHOOTABLE))
 	{ // look for a new target
 		self1->SetState (self1->FindState ("Spawn"));
-		return;
+		return 0;
 	}
 
 	FaceMovementDirection (self1);
@@ -615,14 +646,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurChase)
 			S_Sound (self1, CHAN_WEAPON, self1->AttackSound, 1, ATTN_NORM);
 		}
 		self1->SetState (self1->MeleeState);
-		return;
+		return 0;
 	}
 
 	// Missile attack
 	if (self1->MissileState && P_CheckMissileRange(self1))
 	{
 		self1->SetState (self1->MissileState);
-		return;
+		return 0;
 	}
 
 	// chase towards target
@@ -637,5 +668,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_MinotaurChase)
 	{
 		self1->PlayActiveSound ();
 	}
+	return 0;
 }
 

src/g_shared/a_action.cpp

@@ -59,6 +59,8 @@ IMPLEMENT_CLASS (ASwitchingDecoration)
 
 DEFINE_ACTION_FUNCTION(AActor, A_NoBlocking)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] Andy Baker's stealth monsters
 	if (self->flags & MF_STEALTH)
 	{
@@ -73,7 +75,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_NoBlocking)
 	{
 		P_DropItem (self, self->Conversation->DropType, -1, 256);
 		self->Conversation = NULL;
-		return;
+		return 0;
 	}
 
 	self->Conversation = NULL;
@@ -96,11 +98,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_NoBlocking)
 			}
 		}
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Fall)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	CALL_ACTION(A_NoBlocking, self);
+	return 0;
 }
 
 //==========================================================================
@@ -111,8 +117,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_Fall)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetFloorClip)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 |= MF2_FLOORCLIP;
 	self->AdjustFloorClip ();
+	return 0;
 }
 
 //==========================================================================
@@ -123,8 +132,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SetFloorClip)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnSetFloorClip)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 &= ~MF2_FLOORCLIP;
 	self->floorclip = 0;
+	return 0;
 }
 
 //==========================================================================
@@ -135,7 +147,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnSetFloorClip)
 
 DEFINE_ACTION_FUNCTION(AActor, A_HideThing)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags |= RF_INVISIBLE;
+	return 0;
 }
 
 //==========================================================================
@@ -146,7 +161,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_HideThing)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnHideThing)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
+	return 0;
 }
 
 //============================================================================
@@ -157,6 +175,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnHideThing)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int t = pr_freezedeath();
 	self->tics = 75+t+pr_freezedeath();
 	self->flags |= MF_SOLID|MF_SHOOTABLE|MF_NOBLOOD|MF_ICECORPSE;
@@ -184,6 +204,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeath)
 			self->args[1], self->args[2], self->args[3], self->args[4]);
 		self->special = 0;
 	}
+	return 0;
 }
 
 //==========================================================================
@@ -194,8 +215,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeath)
 
 DEFINE_ACTION_FUNCTION(AActor, A_GenericFreezeDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->Translation = TRANSLATION(TRANSLATION_Standard, 7);
 	CALL_ACTION(A_FreezeDeath, self);
+	return 0;
 }
 
 //============================================================================
@@ -206,6 +230,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_GenericFreezeDeath)
 
 DEFINE_ACTION_FUNCTION(AActor, A_IceSetTics)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int floor;
 
 	self->tics = 70+(pr_icesettics()&63);
@@ -218,6 +244,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceSetTics)
 	{
 		self->tics <<= 1;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -228,6 +255,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_IceSetTics)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeathChunks)
 {
+	PARAM_ACTION_PROLOGUE;
 
 	int i;
 	int numChunks;
@@ -236,7 +264,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeathChunks)
 	if (self->velx || self->vely || self->velz)
 	{
 		self->tics = 3*TICRATE;
-		return;
+		return 0;
 	}
 	S_Sound (self, CHAN_BODY, "misc/icebreak", 1, ATTN_NORM);
 
@@ -297,6 +325,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FreezeDeathChunks)
 	CALL_ACTION(A_NoBlocking, self);
 
 	self->SetState(self->FindState(NAME_Null));
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -400,13 +429,20 @@ void DCorpsePointer::Serialize (FArchive &arc)
 // throw another corpse on the queue
 DEFINE_ACTION_FUNCTION(AActor, A_QueueCorpse)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (sv_corpsequeuesize > 0)
+	{
 		new DCorpsePointer (self);
+	}
+	return 0;
 }
 
 // Remove an self from the queue (for resurrection)
 DEFINE_ACTION_FUNCTION(AActor, A_DeQueueCorpse)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	TThinkerIterator<DCorpsePointer> iterator (STAT_CORPSEPOINTER);
 	DCorpsePointer *corpsePtr;
 
@@ -416,9 +452,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_DeQueueCorpse)
 		{
 			corpsePtr->Corpse = NULL;
 			corpsePtr->Destroy ();
-			return;
+			return 0;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -429,7 +466,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_DeQueueCorpse)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetInvulnerable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 |= MF2_INVULNERABLE;
+	return 0;
 }
 
 //============================================================================
@@ -440,7 +480,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SetInvulnerable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnSetInvulnerable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 &= ~MF2_INVULNERABLE;
+	return 0;
 }
 
 //============================================================================
@@ -451,7 +494,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnSetInvulnerable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetReflective)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 |= MF2_REFLECTIVE;
+	return 0;
 }
 
 //============================================================================
@@ -462,7 +508,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SetReflective)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnSetReflective)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 &= ~MF2_REFLECTIVE;
+	return 0;
 }
 
 //============================================================================
@@ -473,7 +522,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnSetReflective)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetReflectiveInvulnerable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 |= MF2_REFLECTIVE|MF2_INVULNERABLE;
+	return 0;
 }
 
 //============================================================================
@@ -484,7 +536,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SetReflectiveInvulnerable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnSetReflectiveInvulnerable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 &= ~(MF2_REFLECTIVE|MF2_INVULNERABLE);
+	return 0;
 }
 
 //==========================================================================
@@ -495,8 +550,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnSetReflectiveInvulnerable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetShootable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 &= ~MF2_NONSHOOTABLE;
 	self->flags |= MF_SHOOTABLE;
+	return 0;
 }
 
 //==========================================================================
@@ -507,8 +565,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_SetShootable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_UnSetShootable)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags2 |= MF2_NONSHOOTABLE;
 	self->flags &= ~MF_SHOOTABLE;
+	return 0;
 }
 
 //===========================================================================
@@ -519,7 +580,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_UnSetShootable)
 
 DEFINE_ACTION_FUNCTION(AActor, A_NoGravity)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_NOGRAVITY;
+	return 0;
 }
 
 //===========================================================================
@@ -530,8 +594,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_NoGravity)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Gravity)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~MF_NOGRAVITY;
 	self->gravity = FRACUNIT;
+	return 0;
 }
 
 //===========================================================================
@@ -542,8 +609,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_Gravity)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LowGravity)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~MF_NOGRAVITY;
 	self->gravity = FRACUNIT/8;
+	return 0;
 }
 
 //===========================================================================

src/g_shared/a_bridge.cpp

@@ -72,10 +72,12 @@ void ACustomBridge::BeginPlay ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_BridgeOrbit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
 	{ // Don't crash if somebody spawned this into the world
 	  // independantly of a Bridge actor.
-		return;
+		return 0;
 	}
 	// Set default values
 	// Every five tics, Hexen moved the ball 3/256th of a revolution.
@@ -97,18 +99,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_BridgeOrbit)
 	self->x = self->target->x + rotationradius * finecosine[self->angle >> ANGLETOFINESHIFT];
 	self->y = self->target->y + rotationradius * finesine[self->angle >> ANGLETOFINESHIFT];
 	self->z = self->target->z;
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BridgeInit)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(balltype, AActor)	{ balltype = NULL; }
+
 	angle_t startangle;
 	AActor *ball;
 	fixed_t cx, cy, cz;
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(balltype, 0);
-
 	if (balltype == NULL) balltype = PClass::FindClass("BridgeBall");
 
 	cx = self->x;
@@ -127,6 +130,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_BridgeInit)
 		ball->target = self;
 		CALL_ACTION(A_BridgeOrbit, ball);
 	}
+	return 0;
 }
 
 /* never used

src/g_shared/a_pickups.cpp

@@ -266,11 +266,14 @@ bool P_GiveBody (AActor *actor, int num)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialThing1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
 	if (static_cast<AInventory *>(self)->DoRespawn ())
 	{
 		S_Sound (self, CHAN_VOICE, "misc/spawn", 1, ATTN_IDLE);
 	}
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -281,12 +284,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialThing1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialThing2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_SPECIAL;
 	if (!(self->GetDefault()->flags & MF_NOGRAVITY))
 	{
 		self->flags &= ~MF_NOGRAVITY;
 	}
 	self->SetState (self->SpawnState);
+	return 0;
 }
 
 
@@ -298,6 +304,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialThing2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialDoomThing)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->renderflags &= ~RF_INVISIBLE;
 	self->flags |= MF_SPECIAL;
 	if (!(self->GetDefault()->flags & MF_NOGRAVITY))
@@ -310,6 +318,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialDoomThing)
 		S_Sound (self, CHAN_VOICE, "misc/spawn", 1, ATTN_IDLE);
 		Spawn ("ItemFog", self->x, self->y, self->z, ALLOW_REPLACE);
 	}
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -320,6 +329,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialDoomThing)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialPosition)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// Move item back to its original location
 	fixed_t _x, _y;
 	sector_t *sec;
@@ -356,6 +367,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RestoreSpecialPosition)
 			self->z += FloatBobOffsets[(self->FloatBobPhase + level.maptime) & 63];
 		}
 	}
+	return 0;
 }
 
 int AInventory::StaticLastMessageTic;

src/g_shared/a_randomspawner.cpp

@@ -164,7 +164,7 @@ class ARandomSpawner : public AActor
 		Super::Tick();
 		if (tracer == NULL || tracer->health <= 0)
 		{
-			CALL_ACTION(A_BossDeath, this);
+			A_BossDeath(this);
 			Destroy();
 		}
 	}
@@ -172,4 +172,3 @@ class ARandomSpawner : public AActor
 };
 
 IMPLEMENT_CLASS (ARandomSpawner)
-

src/g_shared/a_specialspot.cpp

@@ -384,36 +384,36 @@ void ASpecialSpot::Destroy()
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnSingleItem)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS		(cls, AActor);
+	PARAM_INT_OPT	(fail_sp) { fail_sp = 0; }
+	PARAM_INT_OPT	(fail_co) { fail_co = 0; }
+	PARAM_INT_OPT	(fail_dm) { fail_dm = 0; }
+
 	AActor *spot = NULL;
 	DSpotState *state = DSpotState::GetSpotState();
 
 	if (state != NULL) spot = state->GetRandomSpot(RUNTIME_TYPE(self), true);
-	if (spot == NULL) return;
-
-	ACTION_PARAM_START(4);
-	ACTION_PARAM_CLASS(cls, 0);
-	ACTION_PARAM_INT(fail_sp, 1);
-	ACTION_PARAM_INT(fail_co, 2);
-	ACTION_PARAM_INT(fail_dm, 3);
+	if (spot == NULL) return 0;
 
 	if (!multiplayer && pr_spawnmace() < fail_sp)
 	{ // Sometimes doesn't show up if not in deathmatch
-		return;
+		return 0;
 	}
 
 	if (multiplayer && !deathmatch && pr_spawnmace() < fail_co)
 	{
-		return;
+		return 0;
 	}
 
 	if (deathmatch && pr_spawnmace() < fail_dm)
 	{
-		return;
+		return 0;
 	}
 
 	if (cls == NULL)
 	{
-		return;
+		return 0;
 	}
 
 	AActor *spawned = Spawn(cls, self->x, self->y, self->z, ALLOW_REPLACE);
@@ -432,5 +432,6 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SpawnSingleItem)
 			static_cast<AInventory*>(spawned)->SpawnPointClass = RUNTIME_TYPE(self);
 		}
 	}
+	return 0;
 }
 

src/g_shared/a_weapons.cpp

@@ -1702,23 +1702,24 @@ const PClass *Net_ReadWeapon(BYTE **stream)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AWeapon, A_ZoomFactor)
 {
-	ACTION_PARAM_START(2);
-	ACTION_PARAM_FLOAT(zoom, 0);
-	ACTION_PARAM_INT(flags, 1);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_FLOAT_OPT	(zoom)	{ zoom = 1; }
+	PARAM_INT_OPT	(flags)	{ flags = 0; }
 
 	if (self->player != NULL && self->player->ReadyWeapon != NULL)
 	{
-		zoom = 1 / clamp(zoom, 0.1f, 50.f);
+		zoom = 1 / clamp(zoom, 0.1, 50.0);
 		if (flags & 1)
 		{ // Make the zoom instant.
-			self->player->FOV = self->player->DesiredFOV * zoom;
+			self->player->FOV = float(self->player->DesiredFOV * zoom);
 		}
 		if (flags & 2)
 		{ // Disable pitch/yaw scaling.
 			zoom = -zoom;
 		}
-		self->player->ReadyWeapon->FOVScale = zoom;
+		self->player->ReadyWeapon->FOVScale = float(zoom);
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -1729,11 +1730,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AWeapon, A_ZoomFactor)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AWeapon, A_SetCrosshair)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(xhair, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT(xhair);
 
 	if (self->player != NULL && self->player->ReadyWeapon != NULL)
 	{
 		self->player->ReadyWeapon->Crosshair = xhair;
 	}
+	return 0;
 }

src/g_strife/a_acolyte.cpp

@@ -27,11 +27,14 @@
 
 DEFINE_ACTION_FUNCTION(AActor, A_HideDecepticon)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	EV_DoDoor (DDoor::doorClose, NULL, self, 999, 8*FRACUNIT, 0, 0, 0);
 	if (self->target != NULL && self->target->player != NULL)
 	{
 		P_NoiseAlert (self->target, self);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -42,6 +45,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_HideDecepticon)
 
 DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int i;
 
 	// [RH] Disable translucency here.
@@ -49,7 +54,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 
 	// Only the Blue Acolyte does extra stuff on death.
 	if (self->GetClass()->TypeName != NAME_AcolyteBlue)
-		return;
+		return 0;
 
 	// Make sure somebody is still alive
 	for (i = 0; i < MAXPLAYERS; ++i)
@@ -58,7 +63,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 			break;
 	}
 	if (i == MAXPLAYERS)
-		return;
+		return 0;
 
 	// Make sure all the other blue acolytes are dead.
 	TThinkerIterator<AActor> iterator(NAME_AcolyteBlue);
@@ -68,7 +73,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 	{
 		if (other != self && other->health > 0)
 		{ // Found a living one
-			return;
+			return 0;
 		}
 	}
 
@@ -76,6 +81,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 	players[i].SetLogNumber (14);
 	S_StopSound (CHAN_VOICE);
 	S_Sound (CHAN_VOICE, "svox/voc14", 1, ATTN_NORM);
+	return 0;
 }
 
 //============================================================================
@@ -86,9 +92,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteDie)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BeShadowyFoe)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->RenderStyle = STYLE_Translucent;
 	self->alpha = HR_SHADOW;
 	self->flags &= ~MF_FRIENDLY;
+	return 0;
 }
 
 //============================================================================
@@ -99,6 +108,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BeShadowyFoe)
 
 DEFINE_ACTION_FUNCTION(AActor, A_AcolyteBits)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->SpawnFlags & MTF_SHADOW)
 	{
 		CALL_ACTION(A_BeShadowyFoe, self);
@@ -115,4 +126,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_AcolyteBits)
 			self->RenderStyle.BlendOp = STYLEOP_None;
 		}
 	}
+	return 0;
 }

src/g_strife/a_alienspectres.cpp

@@ -22,6 +22,8 @@ AActor *P_SpawnSubMissile (AActor *source, const PClass *type, AActor *target);
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkSmall)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo = Spawn("AlienChunkSmall", self->x, self->y, self->z + 10*FRACUNIT, ALLOW_REPLACE);
 
 	if (foo != NULL)
@@ -36,10 +38,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkSmall)
 
 		foo->velz = (pr_spectrechunk() & 15) << FRACBITS;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkLarge)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo = Spawn("AlienChunkLarge", self->x, self->y, self->z + 10*FRACUNIT, ALLOW_REPLACE);
 
 	if (foo != NULL)
@@ -54,13 +59,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectreChunkLarge)
 
 		foo->velz = (pr_spectrechunk() & 7) << FRACBITS;
 	}
-
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Spectre3Attack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	AActor *foo = Spawn("SpectralLightningV2", self->x, self->y, self->z + 32*FRACUNIT, ALLOW_REPLACE);
 
@@ -76,10 +83,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_Spectre3Attack)
 		P_SpawnSubMissile (self, PClass::FindClass("SpectralLightningBall2"), self);
 	}
 	self->angle -= ANGLE_180 / 20 * 10;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_AlienSpectreDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *player;
 	char voc[32];
 	int log;
@@ -88,7 +98,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AlienSpectreDeath)
 	CALL_ACTION(A_NoBlocking, self); // [RH] Need this for Sigil rewarding
 	if (!CheckBossDeath (self))
 	{
-		return;
+		return 0;
 	}
 	for (i = 0, player = NULL; i < MAXPLAYERS; ++i)
 	{
@@ -100,7 +110,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AlienSpectreDeath)
 	}
 	if (player == NULL)
 	{
-		return;
+		return 0;
 	}
 
 	switch (self->GetClass()->TypeName)
@@ -184,9 +194,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_AlienSpectreDeath)
 		break;
 
 	default:
-		return;
+		return 0;
 	}
 	mysnprintf (voc, countof(voc), "svox/voc%d", log);
 	S_Sound (CHAN_VOICE, voc, 1, ATTN_NORM);
 	player->player->SetLogNumber (log);
+	return 0;
 }

src/g_strife/a_crusader.cpp

@@ -20,8 +20,10 @@ bool Sys_1ed64 (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrusaderChoose)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	if (Sys_1ed64 (self))
 	{
@@ -44,42 +46,55 @@ DEFINE_ACTION_FUNCTION(AActor, A_CrusaderChoose)
 		}
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrusaderSweepLeft)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->angle += ANGLE_90/16;
 	AActor *misl = P_SpawnMissileZAimed (self, self->z + 48*FRACUNIT, self->target, PClass::FindClass("FastFlameMissile"));
 	if (misl != NULL)
 	{
 		misl->velz += FRACUNIT;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrusaderSweepRight)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->angle -= ANGLE_90/16;
 	AActor *misl = P_SpawnMissileZAimed (self, self->z + 48*FRACUNIT, self->target, PClass::FindClass("FastFlameMissile"));
 	if (misl != NULL)
 	{
 		misl->velz += FRACUNIT;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrusaderRefire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL ||
 		self->target->health <= 0 ||
 		!P_CheckSight (self, self->target))
 	{
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrusaderDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (CheckBossDeath (self))
 	{
 		EV_DoFloor (DFloor::floorLowerToLowest, NULL, 667, FRACUNIT, 0, 0, 0, false);
 	}
+	return 0;
 }

src/g_strife/a_entityboss.cpp

@@ -14,10 +14,13 @@ static FRandom pr_entity ("Entity");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SubEntityDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (CheckBossDeath (self))
 	{
 		G_ExitLevel (0, false);
 	}
+	return 0;
 }
 
 void A_SpectralMissile (AActor *self, const char *missilename)
@@ -41,6 +44,8 @@ DECLARE_ACTION(A_Spectre3Attack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_EntityAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// Apparent Strife bug: Case 5 was unreachable because they used % 5 instead of % 6.
 	// I've fixed that by making case 1 duplicate it, since case 1 did nothing.
 	switch (pr_entity() % 5)
@@ -66,11 +71,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_EntityAttack)
 		A_SpectralMissile (self, "SpectralLightningBigBall2");
 		break;
 	}
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnEntity)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *entity = Spawn("EntityBoss", self->x, self->y, self->z + 70*FRACUNIT, ALLOW_REPLACE);
 	if (entity != NULL)
 	{
@@ -79,10 +87,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnEntity)
 		entity->velz = 5*FRACUNIT;
 		entity->tracer = self;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_EntityDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *second;
 	fixed_t secondRadius = GetDefaultByName("EntitySecond")->radius * 2;
 	angle_t an;
@@ -121,4 +132,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_EntityDeath)
 	second->velx = FixedMul (secondRadius, finecosine[an]) << 2;
 	second->vely = FixedMul (secondRadius, finesine[an]) << 2;
 	A_FaceTarget (second);
+	return 0;
 }

src/g_strife/a_inquisitor.cpp

@@ -12,8 +12,11 @@ static FRandom pr_inq ("Inquisitor");
 
 DEFINE_ACTION_FUNCTION(AActor, A_InquisitorWalk)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "inquisitor/walk", 1, ATTN_NORM);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }
 
 bool InquisitorCheckDistance (AActor *self)
@@ -27,8 +30,10 @@ bool InquisitorCheckDistance (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_InquisitorDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 	if (!InquisitorCheckDistance (self))
@@ -42,14 +47,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorDecide)
 			self->SetState (self->FindState("Jump"));
 		}
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_InquisitorAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *proj;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 
@@ -67,16 +75,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorAttack)
 		proj->velz += 16*FRACUNIT;
 	}
 	self->z -= 32*FRACBITS;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_InquisitorJump)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t dist;
 	fixed_t speed;
 	angle_t an;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_ITEM|CHAN_LOOP, "inquisitor/jump", 1, ATTN_NORM);
 	self->z += 64*FRACUNIT;
@@ -94,10 +105,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorJump)
 	self->velz = (self->target->z - self->z) / dist;
 	self->reactiontime = 60;
 	self->flags |= MF_NOGRAVITY;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_InquisitorCheckLand)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->reactiontime--;
 	if (self->reactiontime < 0 ||
 		self->velx == 0 ||
@@ -108,21 +122,24 @@ DEFINE_ACTION_FUNCTION(AActor, A_InquisitorCheckLand)
 		self->reactiontime = 0;
 		self->flags &= ~MF_NOGRAVITY;
 		S_StopSound (self, CHAN_ITEM);
-		return;
+		return 0;
 	}
 	if (!S_IsActorPlayingSomething (self, CHAN_ITEM, -1))
 	{
 		S_Sound (self, CHAN_ITEM|CHAN_LOOP, "inquisitor/jump", 1, ATTN_NORM);
 	}
-
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_TossArm)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo = Spawn("InquisitorArm", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	foo->angle = self->angle - ANGLE_90 + (pr_inq.Random2() << 22);
 	foo->velx = FixedMul (foo->Speed, finecosine[foo->angle >> ANGLETOFINESHIFT]) >> 3;
 	foo->vely = FixedMul (foo->Speed, finesine[foo->angle >> ANGLETOFINESHIFT]) >> 3;
 	foo->velz = pr_inq() << 10;
+	return 0;
 }
 

src/g_strife/a_loremaster.cpp

@@ -41,8 +41,11 @@ int ALoreShot::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LoremasterChain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "loremaster/active", 1, ATTN_NORM);
 	Spawn("LoreShot2", self->x, self->y, self->z, ALLOW_REPLACE);
 	Spawn("LoreShot2", self->x - (self->velx >> 1), self->y - (self->vely >> 1), self->z - (self->velz >> 1), ALLOW_REPLACE);
 	Spawn("LoreShot2", self->x - self->velx, self->y - self->vely, self->z - self->velz, ALLOW_REPLACE);
+	return 0;
 }

src/g_strife/a_oracle.cpp

@@ -20,6 +20,8 @@ IMPLEMENT_CLASS (AOracle)
 
 DEFINE_ACTION_FUNCTION(AActor, A_WakeOracleSpectre)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	TThinkerIterator<AActor> it(NAME_AlienSpectre3);
 	AActor *spectre = it.Next();
 
@@ -29,6 +31,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_WakeOracleSpectre)
 		spectre->target = self->target;
 		spectre->SetState (spectre->SeeState);
 	}
+	return 0;
 }
 
 

src/g_strife/a_programmer.cpp

@@ -75,21 +75,24 @@ PalEntry AProgLevelEnder::GetBlend ()
 
 DEFINE_ACTION_FUNCTION(AActor, A_ProgrammerMelee)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int damage;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	A_FaceTarget (self);
 
 	if (!self->CheckMeleeRange ())
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "programmer/clank", 1, ATTN_NORM);
 
 	damage = ((pr_prog() % 10) + 1) * 6;
 	P_DamageMobj (self->target, self, self, damage, NAME_Melee);
 	P_TraceBleed (damage, self->target, self);
+	return 0;
 }
 
 //============================================================================
@@ -100,10 +103,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_ProgrammerMelee)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpotLightning)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *spot;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	spot = Spawn("SpectralLightningSpot", self->target->x, self->target->y, self->target->floorz, ALLOW_REPLACE);
 	if (spot != NULL)
@@ -113,6 +118,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpotLightning)
 		spot->health = -2;
 		spot->tracer = self->target;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -123,6 +129,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpotLightning)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpawnProgrammerBase)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo = Spawn("ProgrammerBase", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	if (foo != NULL)
 	{
@@ -131,6 +139,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnProgrammerBase)
 		foo->vely = FixedMul (foo->Speed, finesine[foo->angle >> ANGLETOFINESHIFT]);
 		foo->velz = pr_prog() << 9;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -141,8 +150,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpawnProgrammerBase)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ProgrammerDeath)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!CheckBossDeath (self))
-		return;
+		return 0;
 
 	for (int i = 0; i < MAXPLAYERS; ++i)
 	{
@@ -154,4 +165,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_ProgrammerDeath)
 	}
 	// the sky change scripts are now done as special actions in MAPINFO
 	CALL_ACTION(A_BossDeath, self);
+	return 0;
 }

src/g_strife/a_reaver.cpp

@@ -13,6 +13,8 @@ static FRandom pr_reaverattack ("ReaverAttack");
 
 DEFINE_ACTION_FUNCTION(AActor, A_ReaverRanged)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target != NULL)
 	{
 		angle_t bangle;
@@ -30,4 +32,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_ReaverRanged)
 			P_LineAttack (self, angle, MISSILERANGE, pitch, damage, NAME_None, NAME_StrifePuff);
 		}
 	}
+	return 0;
 }

src/g_strife/a_rebels.cpp

@@ -22,10 +22,12 @@ static FRandom pr_shootgun ("ShootGun");
 
 DEFINE_ACTION_FUNCTION(AActor, A_ShootGun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pitch;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "monsters/rifle", 1, ATTN_NORM);
 	A_FaceTarget (self);
@@ -33,6 +35,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShootGun)
 	P_LineAttack (self, self->angle + (pr_shootgun.Random2() << 19),
 		MISSILERANGE, pitch,
 		3*(pr_shootgun() % 5 + 1), NAME_None, NAME_StrifePuff);
+	return 0;
 }
 
 // Teleporter Beacon --------------------------------------------------------
@@ -71,6 +74,8 @@ bool ATeleporterBeacon::Use (bool pickup)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Beacon)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *owner = self->target;
 	AActor *rebel;
 	angle_t an;
@@ -79,7 +84,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Beacon)
 	if (!P_TryMove (rebel, rebel->x, rebel->y, true))
 	{
 		rebel->Destroy ();
-		return;
+		return 0;
 	}
 	// Once the rebels start teleporting in, you can't pick up the beacon anymore.
 	self->flags &= ~MF_SPECIAL;
@@ -114,4 +119,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_Beacon)
 	{
 		self->SetState(self->FindState(NAME_Death));
 	}
+	return 0;
 }

src/g_strife/a_sentinel.cpp

@@ -11,15 +11,17 @@ static FRandom pr_sentinelrefire ("SentinelRefire");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SentinelBob)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t minz, maxz;
 
 	if (self->flags & MF_INFLOAT)
 	{
 		self->velz = 0;
-		return;
+		return 0;
 	}
 	if (self->threshold != 0)
-		return;
+		return 0;
 
 	maxz =  self->ceilingz - self->height - 16*FRACUNIT;
 	minz = self->floorz + 96*FRACUNIT;
@@ -36,16 +38,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelBob)
 		self->velz += FRACUNIT;
 	}
 	self->reactiontime = (minz >= self->z) ? 4 : 0;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_SentinelAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *missile, *trail;
 
 	// [BB] Without a target the P_SpawnMissileZAimed call will crash.
 	if (!self->target)
 	{
-		return;
+		return 0;
 	}
 
 	missile = P_SpawnMissileZAimed (self, self->z + 32*FRACUNIT, self->target, PClass::FindClass("SentinelFX2"));
@@ -69,10 +74,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelAttack)
 		}
 		missile->z += missile->velz >> 2;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_SentinelRefire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	A_FaceTarget (self);
 
 	if (pr_sentinelrefire() >= 30)
@@ -86,4 +94,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_SentinelRefire)
 			self->SetState (self->SeeState);
 		}
 	}
+	return 0;
 }

src/g_strife/a_spectral.cpp

@@ -28,14 +28,19 @@ void ASpectralMonster::Touch (AActor *toucher)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightningTail)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo = Spawn("SpectralLightningHTail", self->x - self->velx, self->y - self->vely, self->z, ALLOW_REPLACE);
 
 	foo->angle = self->angle;
 	foo->health = self->health;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpectralBigBallLightning)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	const PClass *cls = PClass::FindClass("SpectralLightningH3");
 	if (cls)
 	{
@@ -46,12 +51,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectralBigBallLightning)
 		self->angle += ANGLE_90;
 		P_SpawnSubMissile (self, cls, self->target);
 	}
+	return 0;
 }
 
 static FRandom pr_zap5 ("Zap5");
 
 DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightning)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *flash;
 	fixed_t x, y;
 
@@ -76,6 +84,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightning)
 	flash->target = self->target;
 	flash->velz = -18*FRACUNIT;
 	flash->health = self->health;
+	return 0;
 }
 
 // In Strife, this number is stored in the data segment, but it doesn't seem to be
@@ -84,6 +93,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_SpectralLightning)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Tracer2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *dest;
 	angle_t exact;
 	fixed_t dist;
@@ -92,7 +103,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer2)
 	dest = self->tracer;
 
 	if (!dest || dest->health <= 0 || self->Speed == 0 || !self->CanSeek(dest))
-		return;
+		return 0;
 
 	// change angle
 	exact = R_PointToAngle2 (self->x, self->y, dest->x, dest->y);
@@ -144,4 +155,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_Tracer2)
 			self->velz += FRACUNIT/8;
 		}
 	}
+	return 0;
 }

src/g_strife/a_stalker.cpp

@@ -13,6 +13,8 @@ static FRandom pr_stalker ("Stalker");
 
 DEFINE_ACTION_FUNCTION(AActor, A_StalkerChaseDecide)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!(self->flags & MF_NOGRAVITY))
 	{
 		self->SetState (self->FindState("SeeFloor"));
@@ -21,10 +23,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_StalkerChaseDecide)
 	{
 		self->SetState (self->FindState("Drop"));
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_StalkerLookInit)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	FState *state;
 	if (self->flags & MF_NOGRAVITY)
 	{
@@ -38,16 +43,22 @@ DEFINE_ACTION_FUNCTION(AActor, A_StalkerLookInit)
 	{
 		self->SetState (state);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_StalkerDrop)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags5 &= ~MF5_NOVERTICALMELEERANGE;
 	self->flags &= ~MF_NOGRAVITY;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_StalkerAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->flags & MF_NOGRAVITY)
 	{
 		self->SetState (self->FindState("Drop"));
@@ -63,11 +74,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_StalkerAttack)
 			P_TraceBleed (damage, self->target, self);
 		}
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_StalkerWalk)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_BODY, "stalker/walk", 1, ATTN_NORM);
-	A_Chase (self);
+	A_Chase (stack, self);
+	return 0;
 }
 

src/g_strife/a_strifeitems.cpp

@@ -23,6 +23,8 @@ IMPLEMENT_CLASS(ADegninOre)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RemoveForceField)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~MF_SPECIAL;
 
 	for (int i = 0; i < self->Sector->linecount; ++i)
@@ -36,6 +38,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RemoveForceField)
 			line->sidedef[1]->SetTexture(side_t::mid, FNullTextureID());
 		}
 	}
+	return 0;
 }
 
 bool ADegninOre::Use (bool pickup)

src/g_strife/a_strifestuff.cpp

@@ -431,22 +431,30 @@ int AForceFieldGuard::TakeSpecialDamage (AActor *inflictor, AActor *source, int
 
 DEFINE_ACTION_FUNCTION(AActor, A_SetShadow)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_STRIFEx8000000|MF_SHADOW;
 	self->RenderStyle = STYLE_Translucent;
 	self->alpha = HR_SHADOW;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_ClearShadow)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags &= ~(MF_STRIFEx8000000|MF_SHADOW);
 	self->RenderStyle = STYLE_Normal;
 	self->alpha = OPAQUE;
+	return 0;
 }
 
 static FRandom pr_gethurt ("HurtMe!");
 
 DEFINE_ACTION_FUNCTION(AActor, A_GetHurt)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags4 |= MF4_INCOMBAT;
 	if ((pr_gethurt() % 5) == 0)
 	{
@@ -457,16 +465,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_GetHurt)
 	{
 		self->Die (self->target, self->target);
 	}
+	return 0;
 }
 
 // Klaxon Warning Light -----------------------------------------------------
 
 DEFINE_ACTION_FUNCTION(AActor, A_TurretLook)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *target;
 
 	if (self->flags5 & MF5_INCONVERSATION)
-		return;
+		return 0;
 
 	self->threshold = 0;
 	target = self->LastHeard;
@@ -478,7 +489,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_TurretLook)
 		self->target = target;
 		if ((self->flags & MF_AMBUSH) && !P_CheckSight (self, target))
 		{
-			return;
+			return 0;
 		}
 		if (self->SeeSound != 0)
 		{
@@ -488,10 +499,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_TurretLook)
 		self->threshold = 10;
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_KlaxonBlare)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (--self->reactiontime < 0)
 	{
 		self->target = NULL;
@@ -515,6 +529,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_KlaxonBlare)
 	{
 		S_Sound (self, CHAN_VOICE, "misc/alarm", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 // Power Coupling -----------------------------------------------------------
@@ -578,6 +593,8 @@ IMPLEMENT_CLASS (AMeat)
 
 DEFINE_ACTION_FUNCTION(AActor, A_TossGib)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	const char *gibtype = (self->flags & MF_NOBLOOD) ? "Junk" : "Meat";
 	AActor *gib = Spawn (gibtype, self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	angle_t an;
@@ -585,7 +602,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_TossGib)
 
 	if (gib == NULL)
 	{
-		return;
+		return 0;
 	}
 
 	an = pr_gibtosser() << 24;
@@ -594,37 +611,49 @@ DEFINE_ACTION_FUNCTION(AActor, A_TossGib)
 	gib->velx = speed * finecosine[an >> ANGLETOFINESHIFT];
 	gib->vely = speed * finesine[an >> ANGLETOFINESHIFT];
 	gib->velz = (pr_gibtosser() & 15) << FRACBITS;
+	return 0;
 }
 
 //============================================================================
 
 DEFINE_ACTION_FUNCTION(AActor, A_FLoopActiveSound)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->ActiveSound != 0 && !(level.time & 7))
 	{
 		S_Sound (self, CHAN_VOICE, self->ActiveSound, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Countdown)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (--self->reactiontime <= 0)
 	{
 		P_ExplodeMissile (self, NULL, NULL);
 		self->flags &= ~MF_SKULLFLY;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_LoopActiveSound)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->ActiveSound != 0 && !S_IsActorPlayingSomething (self, CHAN_VOICE, -1))
 	{
 		S_Sound (self, CHAN_VOICE|CHAN_LOOP, self->ActiveSound, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CheckTerrain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	sector_t *sec = self->Sector;
 
 	if (self->z == sec->floorplane.ZatPoint (self->x, self->y))
@@ -643,6 +672,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckTerrain)
 			self->vely += FixedMul (speed, finesine[finean]);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -653,6 +683,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckTerrain)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ClearSoundTarget)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *actor;
 
 	self->Sector->SoundTarget = NULL;
@@ -660,11 +692,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_ClearSoundTarget)
 	{
 		actor->LastHeard = NULL;
 	}
+	return 0;
 }
 
 
 DEFINE_ACTION_FUNCTION(AActor, A_ItBurnsItBurns)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_VOICE, "human/imonfire", 1, ATTN_NORM);
 
 	if (self->player != NULL && self->player->mo == self)
@@ -676,17 +711,23 @@ DEFINE_ACTION_FUNCTION(AActor, A_ItBurnsItBurns)
 		self->player->playerstate = PST_LIVE;
 		self->player->extralight = 3;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_DropFire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *drop = Spawn("FireDroplet", self->x, self->y, self->z + 24*FRACUNIT, ALLOW_REPLACE);
 	drop->velz = -FRACUNIT;
 	P_RadiusAttack (self, self, 64, 64, NAME_Fire, false);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_CrispyPlayer)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL && self->player->mo == self)
 	{
 		self->player->playerstate = PST_DEAD;
@@ -694,10 +735,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_CrispyPlayer)
 			self->player->psprites[ps_weapon].state +
 			(self->FindState("FireHandsLower") - self->FindState("FireHands")));
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_HandLower)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		pspdef_t *psp = &self->player->psprites[ps_weapon];
@@ -708,5 +752,6 @@ DEFINE_ACTION_FUNCTION(AActor, A_HandLower)
 		}
 		if (self->player->extralight > 0) self->player->extralight--;
 	}
+	return 0;
 }
 

src/g_strife/a_strifeweapons.cpp

@@ -94,6 +94,8 @@ void P_DaggerAlert (AActor *target, AActor *emitter)
 
 DEFINE_ACTION_FUNCTION(AActor, A_JabDagger)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	angle_t 	angle;
 	int 		damage;
 	int 		pitch;
@@ -129,6 +131,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_JabDagger)
 	{
 		S_Sound (self, CHAN_WEAPON, "misc/swish", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -139,6 +142,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_JabDagger)
 
 DEFINE_ACTION_FUNCTION(AActor, A_AlertMonsters)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		P_NoiseAlert(self, self);
@@ -147,6 +152,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_AlertMonsters)
 	{
 		P_NoiseAlert (self->target, self);
 	}
+	return 0;
 }
 
 // Poison Bolt --------------------------------------------------------------
@@ -186,12 +192,15 @@ int APoisonBolt::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ClearFlash)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 
 	if (player == NULL)
-		return;
+		return 0;
 
 	P_SetPsprite (player, ps_flash, NULL);
+	return 0;
 }
 
 //============================================================================
@@ -202,10 +211,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_ClearFlash)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ShowElectricFlash)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		P_SetPsprite (self->player, ps_flash, self->player->ReadyWeapon->FindState(NAME_Flash));
 	}
+	return 0;
 }
 
 //============================================================================
@@ -216,19 +228,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_ShowElectricFlash)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireArrow)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS(ti, AActor);
+
 	angle_t savedangle;
 
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(ti, 0);
-
 	if (self->player == NULL)
-		return;
+		return 0;
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 
 	if (ti) 
@@ -240,6 +252,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireArrow)
 		self->angle = savedangle;
 		S_Sound (self, CHAN_WEAPON, "weapons/xbowshoot", 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 // Assault Gun --------------------------------------------------------------
@@ -274,6 +287,8 @@ void P_StrifeGunShot (AActor *mo, bool accurate, angle_t pitch)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireAssaultGun)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	bool accurate;
 
 	S_Sound (self, CHAN_WEAPON, "weapons/assaultgun", 1, ATTN_NORM);
@@ -284,7 +299,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireAssaultGun)
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 		}
 		self->player->mo->PlayAttacking2 ();
 		accurate = !self->player->refire;
@@ -295,6 +310,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireAssaultGun)
 	}
 
 	P_StrifeGunShot (self, accurate, P_BulletSlope (self));
+	return 0;
 }
 
 // Mini-Missile Launcher ----------------------------------------------------
@@ -307,17 +323,19 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireAssaultGun)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMiniMissile)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 	angle_t savedangle;
 
 	if (self->player == NULL)
-		return;
+		return 0;
 
 	AWeapon *weapon = self->player->ReadyWeapon;
 	if (weapon != NULL)
 	{
 		if (!weapon->DepleteAmmo (weapon->bAltFire))
-			return;
+			return 0;
 	}
 
 	savedangle = self->angle;
@@ -325,6 +343,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMiniMissile)
 	player->mo->PlayAttacking2 ();
 	P_SpawnPlayerMissile (self, PClass::FindClass("MiniMissile"));
 	self->angle = savedangle;
+	return 0;
 }
 
 //============================================================================
@@ -335,6 +354,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMiniMissile)
 
 DEFINE_ACTION_FUNCTION(AActor, A_RocketInFlight)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *trail;
 
 	S_Sound (self, CHAN_VOICE, "misc/missileinflight", 1, ATTN_NORM);
@@ -344,6 +365,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_RocketInFlight)
 	{
 		trail->velz = FRACUNIT;
 	}
+	return 0;
 }
 
 // Flame Thrower ------------------------------------------------------------
@@ -356,8 +378,11 @@ DEFINE_ACTION_FUNCTION(AActor, A_RocketInFlight)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FlameDie)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->flags |= MF_NOGRAVITY;
 	self->velz = (pr_flamedie() & 3) << FRACBITS;
+	return 0;
 }
 
 //============================================================================
@@ -368,6 +393,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FlameDie)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireFlamer)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 
 	if (player != NULL)
@@ -376,7 +403,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireFlamer)
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 		}
 		player->mo->PlayAttacking2 ();
 	}
@@ -387,6 +414,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireFlamer)
 	{
 		self->velz += 5*FRACUNIT;
 	}
+	return 0;
 }
 
 // Mauler -------------------------------------------------------------------
@@ -402,13 +430,15 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireFlamer)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMauler1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		AWeapon *weapon = self->player->ReadyWeapon;
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 		}
 		// Strife apparently didn't show the player shooting. Let's fix that.
 		self->player->mo->PlayAttacking2 ();
@@ -431,6 +461,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMauler1)
 		// original.
 		P_LineAttack (self, angle, PLAYERMISSILERANGE, pitch, damage, NAME_Disintegrate, NAME_MaulerPuff);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -443,6 +474,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMauler1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMauler2Pre)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_WEAPON, "weapons/mauler2charge", 1, ATTN_NORM);
 
 	if (self->player != NULL)
@@ -450,6 +483,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMauler2Pre)
 		self->player->psprites[ps_weapon].sx += pr_mauler2.Random2() << 10;
 		self->player->psprites[ps_weapon].sy += pr_mauler2.Random2() << 10;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -462,19 +496,22 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireMauler2Pre)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireMauler2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		AWeapon *weapon = self->player->ReadyWeapon;
 		if (weapon != NULL)
 		{
 			if (!weapon->DepleteAmmo (weapon->bAltFire))
-				return;
+				return 0;
 		}
 		self->player->mo->PlayAttacking2 ();
 	}
 	P_SpawnPlayerMissile (self, PClass::FindClass("MaulerTorpedo"));
 	P_DamageMobj (self, self, NULL, 20, self->DamageType);
 	P_ThrustMobj (self, self->angle + ANGLE_180, 0x7D000);
+	return 0;
 }
 
 //============================================================================
@@ -489,6 +526,8 @@ AActor *P_SpawnSubMissile (AActor *source, const PClass *type, AActor *target);
 
 DEFINE_ACTION_FUNCTION(AActor, A_MaulerTorpedoWave)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *wavedef = GetDefaultByName("MaulerTorpedoWave");
 	fixed_t savedz;
 	self->angle += ANGLE_180;
@@ -506,6 +545,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_MaulerTorpedoWave)
 		P_SpawnSubMissile (self, PClass::FindClass("MaulerTorpedoWave"), self->target);
 	}
 	self->z = savedz;
+	return 0;
 }
 
 AActor *P_SpawnSubMissile (AActor *source, const PClass *type, AActor *target)
@@ -568,11 +608,16 @@ int APhosphorousFire::DoSpecialDamage (AActor *target, int damage)
 
 DEFINE_ACTION_FUNCTION(AActor, A_BurnArea)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	P_RadiusAttack (self, self->target, 128, 128, self->DamageType, true);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Burnination)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	self->velz -= 8*FRACUNIT;
 	self->velx += (pr_phburn.Random2 (3)) << FRACBITS;
 	self->vely += (pr_phburn.Random2 (3)) << FRACBITS;
@@ -624,6 +669,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Burnination)
 			drop->flags |= MF_DROPPED;
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -634,25 +680,25 @@ DEFINE_ACTION_FUNCTION(AActor, A_Burnination)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireGrenade)
 {
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS(grenadetype, AActor);
+	PARAM_ANGLE(angleofs);
+	PARAM_STATE(flash)
+
 	player_t *player = self->player;
 	AActor *grenade;
 	angle_t an;
 	fixed_t tworadii;
 	AWeapon *weapon;
 
-	ACTION_PARAM_START(3);
-	ACTION_PARAM_CLASS(grenadetype, 0);
-	ACTION_PARAM_ANGLE(Angle, 1);
-	ACTION_PARAM_STATE(flash, 2);
-
 	if (player == NULL || grenadetype == NULL)
-		return;
+		return 0;
 
 	if ((weapon = player->ReadyWeapon) == NULL)
-		return;
+		return 0;
 
 	if (!weapon->DepleteAmmo (weapon->bAltFire))
-		return;
+		return 0;
 
 	P_SetPsprite (player, ps_flash, flash);
 
@@ -662,7 +708,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireGrenade)
 		grenade = P_SpawnSubMissile (self, grenadetype, self);
 		self->z -= 32*FRACUNIT;
 		if (grenade == NULL)
-			return;
+			return 0;
 
 		if (grenade->SeeSound != 0)
 		{
@@ -676,11 +722,12 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_FireGrenade)
 		grenade->x += FixedMul (finecosine[an], tworadii);
 		grenade->y += FixedMul (finesine[an], tworadii);
 
-		an = self->angle + Angle;
+		an = self->angle + angleofs;
 		an >>= ANGLETOFINESHIFT;
 		grenade->x += FixedMul (finecosine[an], 15*FRACUNIT);
 		grenade->y += FixedMul (finesine[an], 15*FRACUNIT);
 	}
+	return 0;
 }
 
 // The Almighty Sigil! ------------------------------------------------------
@@ -771,12 +818,15 @@ AInventory *ASigil::CreateCopy (AActor *other)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SelectPiece)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pieces = MIN (static_cast<ASigil*>(self)->NumPieces, 5);
 
 	if (pieces > 1)
 	{
 		self->SetState (self->FindState("Spawn")+pieces);
 	}
+	return 0;
 }
 
 //============================================================================
@@ -794,15 +844,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_SelectPiece)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilView)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pieces;
 
 	if (self->player == NULL)
 	{
-		return;
+		return 0;
 	}
 	pieces = static_cast<ASigil*>(self->player->ReadyWeapon)->NumPieces;
 	P_SetPsprite (self->player, ps_weapon,
 		self->player->psprites[ps_weapon].state + pieces);
+	return 0;
 }
 
 //============================================================================
@@ -817,11 +870,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilView)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilDown)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pieces;
 
 	if (self->player == NULL)
 	{
-		return;
+		return 0;
 	}
 	pieces = static_cast<ASigil*>(self->player->ReadyWeapon)->DownPieces;
 	static_cast<ASigil*>(self->player->ReadyWeapon)->DownPieces = 0;
@@ -831,6 +886,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilDown)
 	}
 	P_SetPsprite (self->player, ps_weapon,
 		self->player->psprites[ps_weapon].state + pieces);
+	return 0;
 }
 
 //============================================================================
@@ -843,15 +899,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilDown)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int pieces;
 
 	if (self->player == NULL)
 	{
-		return;
+		return 0;
 	}
 	pieces = static_cast<ASigil*>(self->player->ReadyWeapon)->NumPieces;
 	P_SetPsprite (self->player, ps_weapon,
 		self->player->psprites[ps_weapon].state + 4*pieces - 3);
+	return 0;
 }
 
 //============================================================================
@@ -862,11 +921,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_SelectSigilAttack)
 
 DEFINE_ACTION_FUNCTION(AActor, A_SigilCharge)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
 	if (self->player != NULL)
 	{
 		self->player->extralight = 2;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -877,10 +939,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_SigilCharge)
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightInverse)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		self->player->extralight = INT_MIN;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -891,12 +956,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightInverse)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSigil1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *spot;
 	player_t *player = self->player;
 	AActor *linetarget;
 
 	if (player == NULL || player->ReadyWeapon == NULL)
-		return;
+		return 0;
 
 	P_DamageMobj (self, self, NULL, 1*4, 0, DMG_NO_ARMOR);
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
@@ -924,6 +991,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil1)
 		spot->health = -1;
 		spot->target = self;
 	}
+	return 0;
 }
 
 //============================================================================
@@ -934,15 +1002,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil1)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSigil2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 
 	if (player == NULL || player->ReadyWeapon == NULL)
-		return;
+		return 0;
 
 	P_DamageMobj (self, self, NULL, 2*4, 0, DMG_NO_ARMOR);
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
 
 	P_SpawnPlayerMissile (self, PClass::FindClass("SpectralLightningH1"));
+	return 0;
 }
 
 //============================================================================
@@ -953,12 +1024,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil2)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSigil3)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *spot;
 	player_t *player = self->player;
 	int i;
 
 	if (player == NULL || player->ReadyWeapon == NULL)
-		return;
+		return 0;
 
 	P_DamageMobj (self, self, NULL, 3*4, 0, DMG_NO_ARMOR);
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
@@ -974,6 +1047,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil3)
 		}
 	}
 	self->angle -= (ANGLE_180/20)*10;
+	return 0;
 }
 
 //============================================================================
@@ -984,12 +1058,14 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil3)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSigil4)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *spot;
 	player_t *player = self->player;
 	AActor *linetarget;
 
 	if (player == NULL || player->ReadyWeapon == NULL)
-		return;
+		return 0;
 
 	P_DamageMobj (self, self, NULL, 4*4, 0, DMG_NO_ARMOR);
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
@@ -1012,6 +1088,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil4)
 			spot->vely += FixedMul (spot->Speed, finesine[self->angle >> ANGLETOFINESHIFT]);
 		}
 	}
+	return 0;
 }
 
 //============================================================================
@@ -1022,15 +1099,18 @@ DEFINE_ACTION_FUNCTION(AActor, A_FireSigil4)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FireSigil5)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 
 	if (player == NULL || player->ReadyWeapon == NULL)
-		return;
+		return 0;
 
 	P_DamageMobj (self, self, NULL, 5*4, 0, DMG_NO_ARMOR);
 	S_Sound (self, CHAN_WEAPON, "weapons/sigilcharge", 1, ATTN_NORM);
 
 	P_SpawnPlayerMissile (self, PClass::FindClass("SpectralLightningBigBall1"));
+	return 0;
 }
 
 //============================================================================

src/g_strife/a_templar.cpp

@@ -13,13 +13,15 @@ static FRandom pr_templar ("Templar");
 
 DEFINE_ACTION_FUNCTION(AActor, A_TemplarAttack)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int damage;
 	angle_t angle;
 	int pitch;
 	int pitchdiff;
 
 	if (self->target == NULL)
-		return;
+		return 0;
 
 	S_Sound (self, CHAN_WEAPON, "templar/shoot", 1, ATTN_NORM);
 	A_FaceTarget (self);
@@ -32,4 +34,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_TemplarAttack)
 		pitchdiff = pr_templar.Random2() * 332063;
 		P_LineAttack (self, angle, MISSILERANGE+64*FRACUNIT, pitch+pitchdiff, damage, NAME_Disintegrate, NAME_MaulerPuff);
 	}
+	return 0;
 }

src/g_strife/a_thingstoblowup.cpp

@@ -18,30 +18,36 @@ extern const PClass *QuestItemClasses[31];
 
 DEFINE_ACTION_FUNCTION(AActor, A_Bang4Cloud)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	fixed_t spawnx, spawny;
 
 	spawnx = self->x + (pr_bang4cloud.Random2() & 3) * 10240;
 	spawny = self->y + (pr_bang4cloud.Random2() & 3) * 10240;
 
 	Spawn("Bang4Cloud", spawnx, spawny, self->z, ALLOW_REPLACE);
+	return 0;
 }
 
 // -------------------------------------------------------------------
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GiveQuestItem)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(questitem, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT(questitem);
 
 	// Give one of these quest items to every player in the game
-	for (int i = 0; i < MAXPLAYERS; ++i)
+	if (questitem >= 0 && questitem < countof(QuestItemClasses))
 	{
-		if (playeringame[i])
+		for (int i = 0; i < MAXPLAYERS; ++i)
 		{
-			AInventory *item = static_cast<AInventory *>(Spawn (QuestItemClasses[questitem-1], 0,0,0, NO_REPLACE));
-			if (!item->CallTryPickup (players[i].mo))
+			if (playeringame[i])
 			{
-				item->Destroy ();
+				AInventory *item = static_cast<AInventory *>(Spawn (QuestItemClasses[questitem - 1], 0,0,0, NO_REPLACE));
+				if (!item->CallTryPickup (players[i].mo))
+				{
+					item->Destroy ();
+				}
 			}
 		}
 	}
@@ -55,20 +61,26 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_GiveQuestItem)
 	{
 		C_MidPrint (SmallFont, name);
 	}
+	return 0;
 }
 
 // PowerCrystal -------------------------------------------------------------------
 
 DEFINE_ACTION_FUNCTION(AActor, A_ExtraLightOff)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->target != NULL && self->target->player != NULL)
 	{
 		self->target->player->extralight = 0;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Explode512)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	P_RadiusAttack (self, self->target, 512, 512, NAME_None, true);
 	if (self->target != NULL && self->target->player != NULL)
 	{
@@ -81,10 +93,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_Explode512)
 
 	// Strife didn't do this next part, but it looks good
 	self->RenderStyle = STYLE_Add;
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_LightGoesOut)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *foo;
 	sector_t *sec = self->Sector;
 	vertex_t *spot;
@@ -106,4 +121,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_LightGoesOut)
 			foo->velz = (7 + (pr_lightout() & 3)) << FRACBITS;
 		}
 	}
+	return 0;
 }

src/info.cpp

@@ -51,79 +51,13 @@
 
 extern void LoadActors ();
 
-int CallDecorateAction(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
-{
-	assert(numparam == 6);
-	actionf_p action = (actionf_p)param[5].a;
-	action((AActor *)param[0].a, (AActor *)param[1].a, (FState *)param[2].a, param[3].i, (StateCallData *)param[4].a);
-	return 0;
-}
-
-void FState::SetAction(PSymbolActionFunction *func, bool setdefaultparams)
-{
-	if (func != NULL)
-	{
-		// All generated functions use this code.
-		static const VM_UBYTE codetemplate[] =
-		{
-			OP_PARAM,		0, REGT_POINTER, 0,
-			OP_PARAM,		0, REGT_POINTER, 1,
-			OP_PARAM,		0, REGT_POINTER, 2,
-			OP_PARAM,		0, REGT_INT, 0,
-			OP_PARAM,		0, REGT_POINTER, 3,
-			OP_PARAM,		0, REGT_POINTER|REGT_KONST, 0,
-			OP_CALL_K,		1, 6, 0,
-			OP_RET,			0, REGT_NIL, 0
-		};
-
-		// Find the CallDecorateAction function. If not found, create it and install it
-		// in Actor.
-		VMFunction *callfunc;
-		PSymbol *sym = RUNTIME_CLASS(AActor)->Symbols.FindSymbol("CallDecorateAction", false);
-		if (sym == NULL)
-		{
-			PSymbolVMFunction *symfunc = new PSymbolVMFunction("CallDecorateAction");
-			VMNativeFunction *calldec = new VMNativeFunction(CallDecorateAction);
-			symfunc->Function = calldec;
-			sym = symfunc;
-			RUNTIME_CLASS(AActor)->Symbols.AddSymbol(sym);
-		}
-		assert(sym->SymbolType == SYM_VMFunction);
-		assert(((PSymbolVMFunction *)sym)->Function != NULL);
-		callfunc = ((PSymbolVMFunction *)sym)->Function;
-
-		// Create a function for this state.
-		VMScriptFunction *vmfunc = new VMScriptFunction;
-		vmfunc->Alloc(sizeof(codetemplate)/sizeof(VMOP), 0, 0, 0, 2);
-		memcpy(vmfunc->Code, codetemplate, sizeof(codetemplate));
-		FVoidObj *konsta = vmfunc->KonstA;
-		VM_ATAG *atag = vmfunc->KonstATags();
-		konsta[0].v = (void *)func->Function;
-		konsta[1].o = callfunc;
-		atag[0] = ATAG_GENERIC;
-		atag[1] = ATAG_OBJECT;
-		vmfunc->NumRegA = 4;
-		vmfunc->NumRegD = 1;
-		vmfunc->MaxParam = 6;
-		vmfunc->NumArgs = 5;
-		ActionFunc = vmfunc;
-
-		if (setdefaultparams) ParameterIndex = func->defaultparameterindex+1;
-	}
-	else 
-	{
-		ActionFunc = NULL;
-		if (setdefaultparams) ParameterIndex = 0;
-	}
-}
-
 bool FState::CallAction(AActor *self, AActor *stateowner, StateCallData *statecall)
 {
 	if (ActionFunc != NULL)
 	{
 		//ActionFunc(self, stateowner, this, ParameterIndex-1, statecall);
 		VMFrameStack stack;
-		VMValue params[5] = { self, stateowner, this, ParameterIndex - 1, VMValue(statecall, ATAG_STATE) };
+		VMValue params[4] = { self, stateowner, VMValue(this, ATAG_STATE), statecall };
 		stack.Call(ActionFunc, params, countof(params), NULL, 0, NULL);
 		return true;
 	}

src/info.h

@@ -62,7 +62,6 @@ struct FState
 	BYTE		DefineFlags;	// Unused byte so let's use it during state creation.
 	FState		*NextState;
 	VMFunction	*ActionFunc;
-	int			ParameterIndex;
 
 	inline int GetFrame() const
 	{
@@ -92,7 +91,7 @@ struct FState
 	{
 		Frame = (Frame & SF_FULLBRIGHT) | (frame-'A');
 	}
-	void SetAction(PSymbolActionFunction *func, bool setdefaultparams = true);
+	void SetAction(VMFunction *func) { ActionFunc = func; }
 	bool CallAction(AActor *self, AActor *stateowner, StateCallData *statecall = NULL);
 	static const PClass *StaticFindStateOwner (const FState *state);
 	static const PClass *StaticFindStateOwner (const FState *state, const FActorInfo *info);
@@ -190,4 +189,21 @@ extern FDoomEdMap DoomEdMap;
 int GetSpriteIndex(const char * spritename);
 TArray<FName> &MakeStateNameList(const char * fname);
 
+// Standard parameters for all action functons
+//   self         - Actor this action is to operate on (player if a weapon)
+//   stateowner   - Actor this action really belongs to (may be a weapon)
+//   callingstate - State this action was called from
+//   statecall    - CustomInventory stuff
+#define PARAM_ACTION_PROLOGUE_TYPE(type) \
+	PARAM_PROLOGUE; \
+	PARAM_OBJECT	 (self, type); \
+	PARAM_OBJECT_OPT (stateowner, AActor) { stateowner = self; } \
+	PARAM_STATE_OPT  (callingstate) { callingstate = NULL; } \
+	PARAM_POINTER_OPT(statecall, StateCallData) { statecall = NULL; }
+
+#define PARAM_ACTION_PROLOGUE	PARAM_ACTION_PROLOGUE_TYPE(AActor)
+
+// Number of action paramaters
+#define NAP 4
+
 #endif	// __INFO_H__

src/p_enemy.cpp

@@ -1688,10 +1688,12 @@ bool P_LookForPlayers (AActor *actor, INTBOOL allaround, FLookExParams *params)
 //
 DEFINE_ACTION_FUNCTION(AActor, A_Look)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *targ;
 
 	if (self->flags5 & MF5_INCONVERSATION)
-		return;
+		return 0;
 
 	// [RH] Set goal now if appropriate
 	if (self->special == Thing_SetGoal && self->args[0] == 0) 
@@ -1723,7 +1725,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look)
 
 		if (targ && targ->player && (targ->player->cheats & CF_NOTARGET))
 		{
-			return;
+			return 0;
 		}
 	}
 
@@ -1767,7 +1769,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look)
 	}
 	
 	if (!P_LookForPlayers (self, self->flags4 & MF4_LOOKALLAROUND, NULL))
-		return;
+		return 0;
 				
 	// go into chase state
   seeyou:
@@ -1793,6 +1795,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look)
 	{
 		self->SetState (self->SeeState);
 	}
+	return 0;
 }
 
 
@@ -1805,30 +1808,32 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 {
-	ACTION_PARAM_START(6);
-	ACTION_PARAM_INT(flags, 0);
-	ACTION_PARAM_FIXED(minseedist, 1);
-	ACTION_PARAM_FIXED(maxseedist, 2);
-	ACTION_PARAM_FIXED(maxheardist, 3);
-	ACTION_PARAM_ANGLE(fov, 4);
-	ACTION_PARAM_STATE(seestate, 5);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT_OPT	(flags)			{ flags = 0; }
+	PARAM_FIXED_OPT	(minseedist)	{ minseedist = 0; }
+	PARAM_FIXED_OPT	(maxseedist)	{ maxseedist = 0; }
+	PARAM_FIXED_OPT (maxheardist)	{ maxheardist = 0; }
+	PARAM_ANGLE_OPT	(fov)			{ fov = 0; }
+	PARAM_STATE_OPT	(seestate)		{ seestate = NULL; }
 
 	AActor *targ = NULL; // Shuts up gcc
 	fixed_t dist;
-	FLookExParams params = {fov, minseedist, maxseedist, maxheardist, flags, seestate };
+	FLookExParams params = { fov, minseedist, maxseedist, maxheardist, flags, seestate };
 
 	if (self->flags5 & MF5_INCONVERSATION)
-		return;
+		return 0;
 
 	// [RH] Set goal now if appropriate
 	if (self->special == Thing_SetGoal && self->args[0] == 0) 
 	{
-		NActorIterator iterator (NAME_PatrolPoint, self->args[1]);
+		NActorIterator iterator(NAME_PatrolPoint, self->args[1]);
 		self->special = 0;
 		self->goal = iterator.Next ();
 		self->reactiontime = self->args[2] * TICRATE + level.maptime;
-		if (self->args[3] == 0) self->flags5 &=~ MF5_CHASEGOAL;
-		else self->flags5 |= MF5_CHASEGOAL;
+		if (self->args[3] == 0)
+			self->flags5 &= ~MF5_CHASEGOAL;
+		else
+			self->flags5 |= MF5_CHASEGOAL;
 	}
 
 	self->threshold = 0;		// any shot will wake up
@@ -1851,8 +1856,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 				}
 				else
 				{
-					dist = P_AproxDistance (targ->x - self->x,
-											targ->y - self->y);
+					dist = P_AproxDistance (targ->x - self->x, targ->y - self->y);
 
 					// [KS] If the target is too far away, don't respond to the sound.
 					if (maxheardist && dist > maxheardist)
@@ -1866,7 +1870,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
         
         if (targ && targ->player && (targ->player->cheats & CF_NOTARGET))
         {
-            return;
+            return 0;
         }
 	}
 
@@ -1923,8 +1927,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 			{
 				if (self->flags & MF_AMBUSH)
 				{
-					dist = P_AproxDistance (self->target->x - self->x,
-											self->target->y - self->y);
+					dist = P_AproxDistance (self->target->x - self->x, self->target->y - self->y);
 					if (P_CheckSight (self, self->target, 2) &&
 						(!minseedist || dist > minseedist) &&
 						(!maxseedist || dist < maxseedist))
@@ -1941,11 +1944,11 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 	if (!(flags & LOF_NOSIGHTCHECK))
 	{
 		if (!P_LookForPlayers(self, true, &params))
-			return;
+			return 0;
 	}
 	else
 	{
-		return;
+		return 0;
 	}
 				
 	// go into chase state
@@ -1979,6 +1982,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 			self->SetState (self->SeeState);
 		}
 	}
+	return 0;
 }
 
 // [KS] *** End additions by me ***
@@ -1990,20 +1994,22 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_LookEx)
 //==========================================================================
 DEFINE_ACTION_FUNCTION(AActor, A_Wander)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] Strife probably clears this flag somewhere, but I couldn't find where.
 	// This seems as good a place as any.
 	self->flags4 &= ~MF4_INCOMBAT;
 
 	if (self->flags5 & MF5_INCONVERSATION)
-		return;
+		return 0;
 
 	if (self->flags4 & MF4_STANDSTILL)
-		return;
+		return 0;
 
 	if (self->reactiontime != 0)
 	{
 		self->reactiontime--;
-		return;
+		return 0;
 	}
 
 	// turn towards movement direction if not there yet
@@ -2026,6 +2032,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Wander)
 		P_RandomChaseDir (self);
 		self->movecount += 5;
 	}
+	return 0;
 }
 
 
@@ -2036,10 +2043,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_Wander)
 //==========================================================================
 DEFINE_ACTION_FUNCTION(AActor, A_Look2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	AActor *targ;
 
 	if (self->flags5 & MF5_INCONVERSATION)
-		return;
+		return 0;
 
 	self->threshold = 0;
 	targ = self->LastHeard;
@@ -2062,7 +2071,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look2)
 			self->target = targ;
 			self->threshold = 10;
 			self->SetState (self->SeeState);
-			return;
+			return 0;
 		}
 		else
 		{
@@ -2070,7 +2079,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_Look2)
 				goto nosee;
 			self->SetState (self->SeeState);
 			self->flags4 |= MF4_INCOMBAT;
-			return;
+			return 0;
 		}
 	}
 nosee:
@@ -2082,6 +2091,7 @@ nosee:
 	{
 		self->SetState (self->SpawnState + 3);
 	}
+	return 0;
 }
 
 //=============================================================================
@@ -2097,7 +2107,7 @@ nosee:
 //=============================================================================
 #define CLASS_BOSS_STRAFE_RANGE	64*10*FRACUNIT
 
-void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missilestate, bool playactive, bool nightmarefast, bool dontmove)
+void A_DoChase (VMFrameStack *stack, AActor *actor, bool fastchase, FState *meleestate, FState *missilestate, bool playactive, bool nightmarefast, bool dontmove)
 {
 	int delta;
 
@@ -2607,53 +2617,60 @@ enum ChaseFlags
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Chase)
 {
-	ACTION_PARAM_START(3);
-	ACTION_PARAM_STATE(melee, 0);
-	ACTION_PARAM_STATE(missile, 1);
-	ACTION_PARAM_INT(flags, 2);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_STATE_OPT	(melee)		{ melee = NULL; }
+	PARAM_STATE_OPT	(missile)	{ missile = NULL; }
+	PARAM_INT_OPT	(flags)		{ flags = 0; }
 
-	if (melee != (FState*)-1)
+	if (numparam >= NAP + 1)
 	{
-		if (flags & CHF_RESURRECT && P_CheckForResurrection(self, false)) return;
+		if ((flags & CHF_RESURRECT) && P_CheckForResurrection(self, false))
+			return 0;
 		
-		A_DoChase(self, !!(flags&CHF_FASTCHASE), melee, missile, !(flags&CHF_NOPLAYACTIVE), 
+		A_DoChase(stack, self, !!(flags&CHF_FASTCHASE), melee, missile, !(flags&CHF_NOPLAYACTIVE), 
 					!!(flags&CHF_NIGHTMAREFAST), !!(flags&CHF_DONTMOVE));
 	}
 	else // this is the old default A_Chase
 	{
-		A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+		A_DoChase(stack, self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_FastChase)
 {
-	A_DoChase (self, true, self->MeleeState, self->MissileState, true, true, false);
+	PARAM_ACTION_PROLOGUE;
+	A_DoChase(stack, self, true, self->MeleeState, self->MissileState, true, true, false);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_VileChase)
 {
+	PARAM_ACTION_PROLOGUE;
 	if (!P_CheckForResurrection(self, true))
-		A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+		A_DoChase(stack, self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_ExtChase)
 {
-	ACTION_PARAM_START(4);
-	ACTION_PARAM_BOOL(domelee, 0);
-	ACTION_PARAM_BOOL(domissile, 1);
-	ACTION_PARAM_BOOL(playactive, 2);
-	ACTION_PARAM_BOOL(nightmarefast, 3);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_BOOL		(domelee);
+	PARAM_BOOL		(domissile);
+	PARAM_BOOL_OPT	(playactive)	{ playactive = true; }
+	PARAM_BOOL_OPT	(nightmarefast)	{ nightmarefast = false; }
 
 	// Now that A_Chase can handle state label parameters, this function has become rather useless...
-	A_DoChase(self, false,
-		domelee ? self->MeleeState:NULL, domissile ? self->MissileState:NULL,
+	A_DoChase(stack, self, false,
+		domelee ? self->MeleeState : NULL, domissile ? self->MissileState : NULL,
 		playactive, nightmarefast, false);
+	return 0;
 }
 
 // for internal use
-void A_Chase(AActor *self)
+void A_Chase(VMFrameStack *stack, AActor *self)
 {
-	A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+	A_DoChase(stack, self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
 }
 
 //=============================================================================
@@ -2673,8 +2690,7 @@ void A_FaceTarget (AActor *self)
 	}
 
 	self->flags &= ~MF_AMBUSH;
-	self->angle = R_PointToAngle2 (self->x, self->y,
-									self->target->x, self->target->y);
+	self->angle = R_PointToAngle2 (self->x, self->y, self->target->x, self->target->y);
 	
 	if (self->target->flags & MF_SHADOW)
     {
@@ -2684,7 +2700,9 @@ void A_FaceTarget (AActor *self)
 
 DEFINE_ACTION_FUNCTION(AActor, A_FaceTarget)
 {
+	PARAM_ACTION_PROLOGUE;
 	A_FaceTarget(self);
+	return 0;
 }
 
 //===========================================================================
@@ -2696,8 +2714,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_FaceTarget)
 //===========================================================================
 DEFINE_ACTION_FUNCTION(AActor, A_MonsterRail)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (!self->target)
-		return;
+		return 0;
 
 	// [RH] Andy Baker's stealth monsters
 	if (self->flags & MF_STEALTH)
@@ -2726,10 +2746,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_MonsterRail)
     }
 
 	P_RailAttack (self, self->GetMissileDamage (0, 1), 0);
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_Scream)
 {
+	PARAM_ACTION_PROLOGUE;
 	if (self->DeathSound)
 	{
 		// Check for bosses.
@@ -2743,14 +2765,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_Scream)
 			S_Sound (self, CHAN_VOICE, self->DeathSound, 1, ATTN_NORM);
 		}
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AActor, A_XScream)
 {
+	PARAM_ACTION_PROLOGUE;
 	if (self->player)
 		S_Sound (self, CHAN_VOICE, "*gibbed", 1, ATTN_NORM);
 	else
 		S_Sound (self, CHAN_VOICE, "misc/gibbed", 1, ATTN_NORM);
+	return 0;
 }
 
 //===========================================================================
@@ -2761,8 +2786,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_XScream)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ScreamAndUnblock)
 {
+	PARAM_ACTION_PROLOGUE;
 	CALL_ACTION(A_Scream, self);
 	CALL_ACTION(A_NoBlocking, self);
+	return 0;
 }
 
 //===========================================================================
@@ -2773,10 +2800,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_ScreamAndUnblock)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ActiveSound)
 {
+	PARAM_ACTION_PROLOGUE;
 	if (self->ActiveSound)
 	{
 		S_Sound (self, CHAN_VOICE, self->ActiveSound, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -2787,8 +2816,10 @@ DEFINE_ACTION_FUNCTION(AActor, A_ActiveSound)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ActiveAndUnblock)
 {
+	PARAM_ACTION_PROLOGUE;
 	CALL_ACTION(A_ActiveSound, self);
 	CALL_ACTION(A_NoBlocking, self);
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -2921,6 +2952,8 @@ void P_TossItem (AActor *item)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Pain)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	// [RH] Vary player pain sounds depending on health (ala Quake2)
 	if (self->player && self->player->morphTics == 0)
 	{
@@ -2962,15 +2995,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_Pain)
 	{
 		S_Sound (self, CHAN_VOICE, self->PainSound, 1, ATTN_NORM);
 	}
+	return 0;
 }
 
 // killough 11/98: kill an object
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Die)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_NAME(damagetype, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_NAME_OPT	(damagetype)	{ damagetype = NAME_None; }
 
 	P_DamageMobj (self, NULL, NULL, self->health, damagetype, DMG_FORCED);
+	return 0;
 }
 
 //
@@ -2980,12 +3015,14 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Die)
 
 DEFINE_ACTION_FUNCTION(AActor, A_Detonate)
 {
-	int damage = self->GetMissileDamage (0, 1);
+	PARAM_ACTION_PROLOGUE;
+	int damage = self->GetMissileDamage(0, 1);
 	P_RadiusAttack (self, self->target, damage, damage, self->DamageType, true);
 	if (self->z <= self->floorz + (damage << FRACBITS))
 	{
 		P_HitFloor (self);
 	}
+	return 0;
 }
 
 bool CheckBossDeath (AActor *actor)
@@ -3022,7 +3059,7 @@ bool CheckBossDeath (AActor *actor)
 // A_BossDeath
 // Possibly trigger special effects if on a boss level
 //
-DEFINE_ACTION_FUNCTION(AActor, A_BossDeath)
+void A_BossDeath(AActor *self)
 {
 	FName mytype = self->GetClass()->TypeName;
 
@@ -3118,6 +3155,13 @@ DEFINE_ACTION_FUNCTION(AActor, A_BossDeath)
 	G_ExitLevel (0, false);
 }
 
+DEFINE_ACTION_FUNCTION(AActor, A_BossDeath)
+{
+	PARAM_ACTION_PROLOGUE;
+	A_BossDeath(self);
+	return 0;
+}
+
 //----------------------------------------------------------------------------
 //
 // PROC P_Massacre
@@ -3191,6 +3235,7 @@ bool A_RaiseMobj (AActor *actor, fixed_t speed)
 
 DEFINE_ACTION_FUNCTION(AActor, A_ClassBossHealth)
 {
+	PARAM_ACTION_PROLOGUE;
 	if (multiplayer && !deathmatch)		// co-op only
 	{
 		if (!self->special1)
@@ -3199,4 +3244,5 @@ DEFINE_ACTION_FUNCTION(AActor, A_ClassBossHealth)
 			self->special1 = true;   // has been initialized
 		}
 	}
+	return 0;
 }

src/p_enemy.h

@@ -64,9 +64,9 @@ DECLARE_ACTION(A_NoBlocking)
 DECLARE_ACTION(A_Scream)
 DECLARE_ACTION(A_FreezeDeath)
 DECLARE_ACTION(A_FreezeDeathChunks)
-DECLARE_ACTION(A_BossDeath)
+void A_BossDeath(AActor *self);
 
-void A_Chase(AActor *self);
+void A_Chase(VMFrameStack *stack, AActor *self);
 void A_FaceTarget (AActor *actor);
 
 bool A_RaiseMobj (AActor *, fixed_t speed);

src/p_mobj.cpp

@@ -1009,7 +1009,7 @@ bool AActor::Grind(bool items)
 		{
 			if (this->flags4 & MF4_BOSSDEATH) 
 			{
-				CALL_ACTION(A_BossDeath, this);
+				A_BossDeath(this);
 			}
 			flags &= ~MF_SOLID;
 			flags3 |= MF3_DONTGIB;
@@ -1027,7 +1027,7 @@ bool AActor::Grind(bool items)
 		{
 			if (this->flags4 & MF4_BOSSDEATH) 
 			{
-				CALL_ACTION(A_BossDeath, this);
+				A_BossDeath(this);
 			}
 
 			const PClass *i = PClass::FindClass("RealGibs");

src/p_pspr.cpp

@@ -424,13 +424,16 @@ enum EWRF_Options
 
 DEFINE_ACTION_FUNCTION_PARAMS(AInventory, A_WeaponReady)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(paramflags, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT_OPT(flags)	{ flags = 0; }
 
-	if (!(paramflags & WRF_NoSwitch))	DoReadyWeaponToSwitch(self);
-	if ((paramflags & WRF_NoFire) != WRF_NoFire)	DoReadyWeaponToFire(self, 
-		(!(paramflags & WRF_NoPrimary)), (!(paramflags & WRF_NoSecondary)));
-	if (!(paramflags & WRF_NoBob))	DoReadyWeaponToBob(self);
+	if (!(flags & WRF_NoSwitch))
+		DoReadyWeaponToSwitch(self);
+	if ((flags & WRF_NoFire) != WRF_NoFire)
+		DoReadyWeaponToFire(self, !(flags & WRF_NoPrimary), !(flags & WRF_NoSecondary));
+	if (!(flags & WRF_NoBob))
+		DoReadyWeaponToBob(self);
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -509,11 +512,13 @@ void P_CheckWeaponSwitch (player_t *player)
 
 DEFINE_ACTION_FUNCTION(AInventory, A_ReFire)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 
 	if (NULL == player)
 	{
-		return;
+		return 0;
 	}
 	if ((player->cmd.ucmd.buttons&BT_ATTACK)
 		&& !player->ReadyWeapon->bAltFire
@@ -535,16 +540,19 @@ DEFINE_ACTION_FUNCTION(AInventory, A_ReFire)
 		player->ReadyWeapon->CheckAmmo (player->ReadyWeapon->bAltFire
 			? AWeapon::AltFire : AWeapon::PrimaryFire, true);
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AInventory, A_ClearReFire)
 {
+	PARAM_ACTION_PROLOGUE;
 	player_t *player = self->player;
 
 	if (NULL != player)
 	{
 		player->refire = 0;
 	}
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -559,12 +567,15 @@ DEFINE_ACTION_FUNCTION(AInventory, A_ClearReFire)
 
 DEFINE_ACTION_FUNCTION(AInventory, A_CheckReload)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		self->player->ReadyWeapon->CheckAmmo (
 			self->player->ReadyWeapon->bAltFire ? AWeapon::AltFire
 			: AWeapon::PrimaryFire, true);
 	}
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -575,12 +586,14 @@ DEFINE_ACTION_FUNCTION(AInventory, A_CheckReload)
 
 DEFINE_ACTION_FUNCTION(AInventory, A_Lower)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	player_t *player = self->player;
 	pspdef_t *psp;
 
 	if (NULL == player)
 	{
-		return;
+		return 0;
 	}
 	psp = &player->psprites[ps_weapon];
 	if (player->morphTics || player->cheats & CF_INSTANTWEAPSWITCH)
@@ -593,17 +606,17 @@ DEFINE_ACTION_FUNCTION(AInventory, A_Lower)
 	}
 	if (psp->sy < WEAPONBOTTOM)
 	{ // Not lowered all the way yet
-		return;
+		return 0;
 	}
 	if (player->playerstate == PST_DEAD)
 	{ // Player is dead, so don't bring up a pending weapon
 		psp->sy = WEAPONBOTTOM;
-		return;
+		return 0;
 	}
 	if (player->health <= 0)
 	{ // Player is dead, so keep the weapon off screen
 		P_SetPsprite (player,  ps_weapon, NULL);
-		return;
+		return 0;
 	}
 /*	if (player->PendingWeapon != WP_NOCHANGE)
 	{ // [RH] Make sure we're actually changing weapons.
@@ -612,6 +625,7 @@ DEFINE_ACTION_FUNCTION(AInventory, A_Lower)
 	// [RH] Clear the flash state. Only needed for Strife.
 	P_SetPsprite (player, ps_flash, NULL);
 	P_BringUpWeapon (player);
+	return 0;
 }
 
 //---------------------------------------------------------------------------
@@ -622,27 +636,29 @@ DEFINE_ACTION_FUNCTION(AInventory, A_Lower)
 
 DEFINE_ACTION_FUNCTION(AInventory, A_Raise)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self == NULL)
 	{
-		return;
+		return 0;
 	}
 	player_t *player = self->player;
 	pspdef_t *psp;
 
 	if (NULL == player)
 	{
-		return;
+		return 0;
 	}
 	if (player->PendingWeapon != WP_NOCHANGE)
 	{
 		P_SetPsprite (player, ps_weapon, player->ReadyWeapon->GetDownState());
-		return;
+		return 0;
 	}
 	psp = &player->psprites[ps_weapon];
 	psp->sy -= RAISESPEED;
 	if (psp->sy > WEAPONTOP)
 	{ // Not raised all the way yet
-		return;
+		return 0;
 	}
 	psp->sy = WEAPONTOP;
 	if (player->ReadyWeapon != NULL)
@@ -653,6 +669,7 @@ DEFINE_ACTION_FUNCTION(AInventory, A_Raise)
 	{
 		player->psprites[ps_weapon].state = NULL;
 	}
+	return 0;
 }
 
 
@@ -663,11 +680,12 @@ DEFINE_ACTION_FUNCTION(AInventory, A_Raise)
 //
 DEFINE_ACTION_FUNCTION(AInventory, A_GunFlash)
 {
+	PARAM_ACTION_PROLOGUE;
 	player_t *player = self->player;
 
 	if (NULL == player)
 	{
-		return;
+		return 0;
 	}
 	player->mo->PlayAttacking2 ();
 
@@ -675,6 +693,7 @@ DEFINE_ACTION_FUNCTION(AInventory, A_GunFlash)
 	if (player->ReadyWeapon->bAltFire) flash = player->ReadyWeapon->FindState(NAME_AltFlash);
 	if (flash == NULL) flash = player->ReadyWeapon->FindState(NAME_Flash);
 	P_SetPsprite (player, ps_flash, flash);
+	return 0;
 }
 
 
@@ -740,37 +759,47 @@ void P_GunShot (AActor *mo, bool accurate, const PClass *pufftype, angle_t pitch
 
 DEFINE_ACTION_FUNCTION(AInventory, A_Light0)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		self->player->extralight = 0;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AInventory, A_Light1)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		self->player->extralight = 1;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION(AInventory, A_Light2)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player != NULL)
 	{
 		self->player->extralight = 2;
 	}
+	return 0;
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AInventory, A_Light)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_INT(light, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_INT(light);
 
 	if (self->player != NULL)
 	{
 		self->player->extralight = clamp<int>(light, 0, 20);
 	}
+	return 0;
 }
 
 //------------------------------------------------------------------------

src/p_user.cpp

@@ -1249,6 +1249,8 @@ void APlayerPawn::TweakSpeeds (int &forward, int &side)
 
 DEFINE_ACTION_FUNCTION(AActor, A_PlayerScream)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	int sound = 0;
 	int chan = CHAN_VOICE;
 
@@ -1262,7 +1264,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PlayerScream)
 		{
 			S_Sound (self, CHAN_VOICE, "*death", 1, ATTN_NORM);
 		}
-		return;
+		return 0;
 	}
 
 	// Handle the different player death screams
@@ -1311,6 +1313,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_PlayerScream)
 		}
 	}
 	S_Sound (self, chan, sound, 1, ATTN_NORM);
+	return 0;
 }
 
 
@@ -1322,17 +1325,17 @@ DEFINE_ACTION_FUNCTION(AActor, A_PlayerScream)
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SkullPop)
 {
-	ACTION_PARAM_START(1);
-	ACTION_PARAM_CLASS(spawntype, 0);
+	PARAM_ACTION_PROLOGUE;
+	PARAM_CLASS_OPT(spawntype, APlayerChunk)	{ spawntype = NULL; }
 
 	APlayerPawn *mo;
 	player_t *player;
 
 	// [GRB] Parameterized version
-	if (!spawntype || !spawntype->IsDescendantOf (RUNTIME_CLASS (APlayerChunk)))
+	if (spawntype == NULL || !spawntype->IsDescendantOf(RUNTIME_CLASS(APlayerChunk)))
 	{
 		spawntype = PClass::FindClass("BloodySkull");
-		if (spawntype == NULL) return;
+		if (spawntype == NULL) return 0;
 	}
 
 	self->flags &= ~MF_SOLID;
@@ -1357,6 +1360,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SkullPop)
 		}
 		player->damagecount = 32;
 	}
+	return 0;
 }
 
 //----------------------------------------------------------------------------
@@ -1367,10 +1371,13 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SkullPop)
 
 DEFINE_ACTION_FUNCTION(AActor, A_CheckPlayerDone)
 {
+	PARAM_ACTION_PROLOGUE;
+
 	if (self->player == NULL)
 	{
-		self->Destroy ();
+		self->Destroy();
 	}
+	return 0;
 }
 
 //===========================================================================
@@ -1384,7 +1391,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CheckPlayerDone)
 
 void P_CheckPlayerSprites()
 {
-	for(int i=0; i<MAXPLAYERS; i++)
+	for (int i = 0; i < MAXPLAYERS; i++)
 	{
 		player_t * player = &players[i];
 		APlayerPawn * mo = player->mo;

src/s_sound.cpp

@@ -802,7 +802,7 @@ static void CalcPolyobjSoundOrg(const FPolyObj *poly, fixed_t *x, fixed_t *y, fi
 //==========================================================================
 
 static FSoundChan *S_StartSound(AActor *actor, const sector_t *sec, const FPolyObj *poly,
-	const FVector3 *pt, int channel, FSoundID sound_id, float volume, float attenuation)
+	const FVector3 *pt, int channel, FSoundID sound_id, double volume, double attenuation)
 {
 	sfxinfo_t *sfx;
 	int chanflags;
@@ -860,7 +860,7 @@ static FSoundChan *S_StartSound(AActor *actor, const sector_t *sec, const FPolyO
 	sfx = &S_sfx[sound_id];
 
 	// Scale volume according to SNDINFO data.
-	volume = MIN(volume * sfx->Volume, 1.f);
+	volume = MIN(volume * sfx->Volume, 1.0);
 	if (volume <= 0)
 		return NULL;
 
@@ -1037,11 +1037,11 @@ static FSoundChan *S_StartSound(AActor *actor, const sector_t *sec, const FPolyO
 		{
 			SoundListener listener;
 			S_SetListener(listener, players[consoleplayer].camera);
-			chan = (FSoundChan*)GSnd->StartSound3D (sfx->data, &listener, volume, rolloff, attenuation, pitch, basepriority, pos, vel, channel, startflags, NULL);
+			chan = (FSoundChan*)GSnd->StartSound3D (sfx->data, &listener, float(volume), rolloff, float(attenuation), pitch, basepriority, pos, vel, channel, startflags, NULL);
 		}
 		else
 		{
-			chan = (FSoundChan*)GSnd->StartSound (sfx->data, volume, pitch, startflags, NULL);
+			chan = (FSoundChan*)GSnd->StartSound (sfx->data, float(volume), pitch, startflags, NULL);
 		}
 	}
 	if (chan == NULL && (chanflags & CHAN_LOOP))
@@ -1063,13 +1063,13 @@ static FSoundChan *S_StartSound(AActor *actor, const sector_t *sec, const FPolyO
 		chan->OrgID = FSoundID(org_id);
 		chan->SfxInfo = sfx;
 		chan->EntChannel = channel;
-		chan->Volume = volume;
+		chan->Volume = float(volume);
 		chan->ChanFlags |= chanflags;
 		chan->NearLimit = near_limit;
 		chan->LimitRange = limit_range;
 		chan->Pitch = pitch;
 		chan->Priority = basepriority;
-		chan->DistanceScale = attenuation;
+		chan->DistanceScale = float(attenuation);
 		chan->SourceType = type;
 		switch (type)
 		{
@@ -1156,7 +1156,7 @@ void S_RestartSound(FSoundChan *chan)
 //
 //==========================================================================
 
-void S_Sound (int channel, FSoundID sound_id, float volume, float attenuation)
+void S_Sound (int channel, FSoundID sound_id, double volume, double attenuation)
 {
 	S_StartSound (NULL, NULL, NULL, NULL, channel, sound_id, volume, attenuation);
 }
@@ -1167,7 +1167,7 @@ void S_Sound (int channel, FSoundID sound_id, float volume, float attenuation)
 //
 //==========================================================================
 
-void S_Sound (AActor *ent, int channel, FSoundID sound_id, float volume, float attenuation)
+void S_Sound (AActor *ent, int channel, FSoundID sound_id, double volume, double attenuation)
 {
 	if (ent == NULL || ent->Sector->Flags & SECF_SILENT)
 		return;
@@ -1180,7 +1180,7 @@ void S_Sound (AActor *ent, int channel, FSoundID sound_id, float volume, float a
 //
 //==========================================================================
 
-void S_Sound (const FPolyObj *poly, int channel, FSoundID sound_id, float volume, float attenuation)
+void S_Sound (const FPolyObj *poly, int channel, FSoundID sound_id, double volume, double attenuation)
 {
 	S_StartSound (NULL, NULL, poly, NULL, channel, sound_id, volume, attenuation);
 }
@@ -1191,7 +1191,7 @@ void S_Sound (const FPolyObj *poly, int channel, FSoundID sound_id, float volume
 //
 //==========================================================================
 
-void S_Sound (fixed_t x, fixed_t y, fixed_t z, int channel, FSoundID sound_id, float volume, float attenuation)
+void S_Sound (fixed_t x, fixed_t y, fixed_t z, int channel, FSoundID sound_id, double volume, double attenuation)
 {
 	FVector3 pt(FIXED2FLOAT(x), FIXED2FLOAT(z), FIXED2FLOAT(y));
 	S_StartSound (NULL, NULL, NULL, &pt, channel, sound_id, volume, attenuation);
@@ -1203,7 +1203,7 @@ void S_Sound (fixed_t x, fixed_t y, fixed_t z, int channel, FSoundID sound_id, f
 //
 //==========================================================================
 
-void S_Sound (const sector_t *sec, int channel, FSoundID sfxid, float volume, float attenuation)
+void S_Sound (const sector_t *sec, int channel, FSoundID sfxid, double volume, double attenuation)
 {
 	S_StartSound (NULL, sec, NULL, NULL, channel, sfxid, volume, attenuation);
 }

src/s_sound.h

@@ -217,11 +217,11 @@ void S_PrecacheLevel ();
 void S_CacheSound (sfxinfo_t *sfx);
 
 // Start sound for thing at <ent>
-void S_Sound (int channel, FSoundID sfxid, float volume, float attenuation);
-void S_Sound (AActor *ent, int channel, FSoundID sfxid, float volume, float attenuation);
-void S_Sound (const FPolyObj *poly, int channel, FSoundID sfxid, float volume, float attenuation);
-void S_Sound (const sector_t *sec, int channel, FSoundID sfxid, float volume, float attenuation);
-void S_Sound (fixed_t x, fixed_t y, fixed_t z, int channel, FSoundID sfxid, float volume, float attenuation);
+void S_Sound (int channel, FSoundID sfxid, double volume, double attenuation);
+void S_Sound (AActor *ent, int channel, FSoundID sfxid, double volume, double attenuation);
+void S_Sound (const FPolyObj *poly, int channel, FSoundID sfxid, double volume, double attenuation);
+void S_Sound (const sector_t *sec, int channel, FSoundID sfxid, double volume, double attenuation);
+void S_Sound (fixed_t x, fixed_t y, fixed_t z, int channel, FSoundID sfxid, double volume, double attenuation);
 
 // sound channels
 // channel 0 never willingly overrides

src/sound/fmod_wrap.h

@@ -47,7 +47,7 @@ namespace FMOD
 		FMOD global system functions (optional).
 	*/
 	inline FMOD_RESULT Memory_Initialize(void *poolmem, int poollen, FMOD_MEMORY_ALLOCCALLBACK useralloc, FMOD_MEMORY_REALLOCCALLBACK userrealloc, FMOD_MEMORY_FREECALLBACK userfree, FMOD_MEMORY_TYPE memtypeflags = (FMOD_MEMORY_NORMAL | FMOD_MEMORY_XBOX360_PHYSICAL)) { return FMOD_Memory_Initialize(poolmem, poollen, useralloc, userrealloc, userfree, memtypeflags); }
-	inline FMOD_RESULT Memory_GetStats  (int *currentalloced, int *maxalloced) { return FMOD_Memory_GetStats(currentalloced, maxalloced); }
+	//inline FMOD_RESULT Memory_GetStats  (int *currentalloced, int *maxalloced) { return FMOD_Memory_GetStats(currentalloced, maxalloced); }
 	inline FMOD_RESULT Debug_SetLevel(FMOD_DEBUGLEVEL level)  { return FMOD_Debug_SetLevel(level); }
 	inline FMOD_RESULT Debug_GetLevel(FMOD_DEBUGLEVEL *level) { return FMOD_Debug_GetLevel(level); }
 	inline FMOD_RESULT File_SetDiskBusy(int busy) { return FMOD_File_SetDiskBusy(busy); }

src/thingdef/olddecorations.cpp

@@ -234,24 +234,24 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 			{
 				if (extra.bExplosive)
 				{
-					info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_Explode"));
+					info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_Explode")->Function);
 				}
 			}
 			else
 			{
 				// The first frame plays the death sound and
 				// the second frame makes it nonsolid.
-				info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_Scream"));
+				info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_Scream")->Function);
 				if (extra.bSolidOnDeath)
 				{
 				}
 				else if (extra.DeathStart + 1 < extra.DeathEnd)
 				{
-					info->OwnedStates[extra.DeathStart+1].SetAction(FindGlobalActionFunction("A_NoBlocking"));
+					info->OwnedStates[extra.DeathStart+1].SetAction(FindGlobalActionFunction("A_NoBlocking")->Function);
 				}
 				else
 				{
-					info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_ScreamAndUnblock"));
+					info->OwnedStates[extra.DeathStart].SetAction(FindGlobalActionFunction("A_ScreamAndUnblock")->Function);
 				}
 
 				if (extra.DeathHeight == 0) extra.DeathHeight = ((AActor*)(type->Defaults))->height;
@@ -279,17 +279,17 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 
 			// The first frame plays the burn sound and
 			// the second frame makes it nonsolid.
-			info->OwnedStates[extra.FireDeathStart].SetAction(FindGlobalActionFunction("A_ActiveSound"));
+			info->OwnedStates[extra.FireDeathStart].SetAction(FindGlobalActionFunction("A_ActiveSound")->Function);
 			if (extra.bSolidOnBurn)
 			{
 			}
 			else if (extra.FireDeathStart + 1 < extra.FireDeathEnd)
 			{
-				info->OwnedStates[extra.FireDeathStart+1].SetAction(FindGlobalActionFunction("A_NoBlocking"));
+				info->OwnedStates[extra.FireDeathStart+1].SetAction(FindGlobalActionFunction("A_NoBlocking")->Function);
 			}
 			else
 			{
-				info->OwnedStates[extra.FireDeathStart].SetAction(FindGlobalActionFunction("A_ActiveAndUnblock"));
+				info->OwnedStates[extra.FireDeathStart].SetAction(FindGlobalActionFunction("A_ActiveAndUnblock")->Function);
 			}
 
 			if (extra.BurnHeight == 0) extra.BurnHeight = ((AActor*)(type->Defaults))->height;
@@ -309,13 +309,13 @@ void ParseOldDecoration(FScanner &sc, EDefinitionType def)
 			info->OwnedStates[i].NextState = &info->OwnedStates[info->NumOwnedStates-1];
 			info->OwnedStates[i].Tics = 5;
 			info->OwnedStates[i].Misc1 = 0;
-			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeath"));
+			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeath")->Function);
 
 			i = info->NumOwnedStates - 1;
 			info->OwnedStates[i].NextState = &info->OwnedStates[i];
 			info->OwnedStates[i].Tics = 1;
 			info->OwnedStates[i].Misc1 = 0;
-			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeathChunks"));
+			info->OwnedStates[i].SetAction(FindGlobalActionFunction("A_FreezeDeathChunks")->Function);
 			bag.statedef.SetStateLabel("Ice", &info->OwnedStates[extra.IceDeathStart]);
 		}
 		else if (extra.bGenericIceDeath)

src/thingdef/thingdef.cpp

@@ -302,9 +302,13 @@ static void FinishThingdef()
 			p->Emit(&buildit);
 			delete p;
 		}
-		// FIXME: Call a real function
 		buildit.Emit(OP_CALL_K, buildit.GetConstantAddress(NULL, ATAG_OBJECT), j, 0);
 		VMScriptFunction *func = buildit.MakeFunction();
+		func->NumArgs = tcall->Parameters.Size();
+		for (int k = 0; k < tcall->NumStates; ++k)
+		{
+			tcall->ActorInfo->OwnedStates[tcall->FirstState + k].SetAction(func);
+		}
 #if 1
 		const char *marks = "=======================================================";
 		char label[64];
@@ -318,10 +322,8 @@ static void FinishThingdef()
 		fprintf(dump, "\nDisassembly:\n");
 		VMDisasm(dump, func->Code, func->CodeSize, func);
 #endif
-		//if(i==6) I_Error("Poop");
 	}
 	fclose(dump);
-	I_Error("Poop");
 
 	for (i = 0; i < PClass::m_Types.Size(); i++)
 	{

src/thingdef/thingdef.h

@@ -187,6 +187,7 @@ struct AFuncDesc
 {
 	const char *Name;
 	actionf_p Function;
+	VMNativeFunction **VMPointer;
 };
 
 AFuncDesc *FindFunction(const char * string);
@@ -367,26 +368,27 @@ struct StateCallData
 
 // Macros to handle action functions. These are here so that I don't have to
 // change every single use in case the parameters change.
-#define DECLARE_ACTION(name) void AF_##name(AActor *self, AActor *stateowner, FState *, int, StateCallData *);
+#define DECLARE_ACTION(name)	extern VMNativeFunction *name##_VMPtr;
 
 // This distinction is here so that CALL_ACTION produces errors when trying to
 // access a function that requires parameters.
 #define DEFINE_ACTION_FUNCTION(cls, name) \
-	void AF_##name (AActor *self, AActor *stateowner, FState *, int, StateCallData *); \
-	static AFuncDesc info_##cls##_##name = { #name, AF_##name }; \
-	MSVC_ASEG AFuncDesc *infoptr_##cls##_##name GCC_ASEG = &info_##cls##_##name; \
-	void AF_##name (AActor *self, AActor *stateowner, FState *, int, StateCallData *statecall)
+	static int AF_##name(VM_ARGS); \
+	VMNativeFunction *name##_VMPtr; \
+	static const AFuncDesc cls##_##name##_Hook = { #name, AF_##name, &name##_VMPtr }; \
+	extern AFuncDesc const *const cls##_##name##_HookPtr; \
+	MSVC_ASEG AFuncDesc const *const cls##_##name##_HookPtr GCC_ASEG = &cls##_##name##_Hook; \
+	static int AF_##name(VM_ARGS)
 
-#define DEFINE_ACTION_FUNCTION_PARAMS(cls, name) \
-	void AFP_##name (AActor *self, AActor *stateowner, FState *CallingState, int ParameterIndex, StateCallData *statecall); \
-	static AFuncDesc info_##cls##_##name = { #name, AFP_##name }; \
-	MSVC_ASEG AFuncDesc *infoptr_##cls##_##name GCC_ASEG = &info_##cls##_##name; \
-	void AFP_##name (AActor *self, AActor *stateowner, FState *CallingState, int ParameterIndex, StateCallData *statecall)
+#define DEFINE_ACTION_FUNCTION_PARAMS(cls, name) DEFINE_ACTION_FUNCTION(cls, name)
 
-#define DECLARE_PARAMINFO AActor *self, AActor *stateowner, FState *CallingState, int ParameterIndex, StateCallData *statecall
-#define PUSH_PARAMINFO self, stateowner, CallingState, ParameterIndex, statecall
+//#define DECLARE_PARAMINFO AActor *self, AActor *stateowner, FState *CallingState, int ParameterIndex, StateCallData *statecall
+//#define PUSH_PARAMINFO self, stateowner, CallingState, ParameterIndex, statecall
 
-#define CALL_ACTION(name,self) AF_##name(self, self, NULL, 0, NULL)
+#define CALL_ACTION(name,self) { /*AF_##name(self, self, NULL, 0, NULL)*/ \
+		VMValue params[5] = { self, self, NULL, VMValue(NULL, ATAG_STATE) }; \
+		stack->Call(name##_VMPtr, params, countof(params), NULL, 0, NULL); \
+	}
 
 
 int EvalExpressionI (DWORD x, AActor *self);
@@ -398,6 +400,7 @@ FState *EvalExpressionState (DWORD x, AActor *self);
 const PClass *EvalExpressionClass (DWORD x, AActor *self);
 FName EvalExpressionName (DWORD x, AActor *self);
 
+#if 0
 #define ACTION_PARAM_START(count)
 
 #define ACTION_PARAM_INT(var, i) \
@@ -422,11 +425,12 @@ FName EvalExpressionName (DWORD x, AActor *self);
 	FName var = EvalExpressionName(ParameterIndex+i, self);
 #define ACTION_PARAM_ANGLE(var,i) \
 	angle_t var = angle_t(EvalExpressionF(ParameterIndex+i, self)*ANGLE_90/90.f);
+#endif
 
 #define ACTION_SET_RESULT(v) if (statecall != NULL) statecall->Result = v;
 
 // Checks to see what called the current action function
-#define ACTION_CALL_FROM_ACTOR() (CallingState == self->state)
-#define ACTION_CALL_FROM_WEAPON() (self->player && CallingState != self->state && statecall == NULL)
+#define ACTION_CALL_FROM_ACTOR() (callingstate == self->state)
+#define ACTION_CALL_FROM_WEAPON() (self->player && callingstate != self->state && statecall == NULL)
 #define ACTION_CALL_FROM_INVENTORY() (statecall != NULL)
 #endif

src/thingdef/thingdef_data.cpp

@@ -590,7 +590,10 @@ void InitThingdef()
 
 		while (*++probe != NULL)
 		{
-			AFTable.Push(*(AFuncDesc *)*probe);
+			AFuncDesc *afunc = (AFuncDesc *)*probe;
+			assert(afunc->VMPointer != NULL);
+			*(afunc->VMPointer) = new VMNativeFunction(afunc->Function);
+			AFTable.Push(*afunc);
 		}
 		AFTable.ShrinkToFit();
 		qsort(&AFTable[0], AFTable.Size(), sizeof(AFTable[0]), funccmp);