[3.7.1] Very Fatal Error with inherited ZScript actor

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[3.7.1] Very Fatal Error with inherited ZScript actor

Postby katori » Sat Jan 12, 2019 7:55 pm

Hi, I converted some Strife DECORATE to ZScript as an exercise and to get a basis on friendly behavior. To further customize my friendly peasant I have started to add variants, however, the first of these variants seems to give GZDoom a "Very Fatal Error."

It was suggested in the ZDoom Discord that this could be related to A_Look2(), but I figure even if it is that it's worth reporting a bug since a Very Fatal Error is no good either way. So attached is the bug report and the offending ZScript. If I move the actor around a bit I can sometimes get to see him in game, but it always crashes when there's another FarmPeasant around. Usually crashes within a second or two of starting. I will move away from A_Look2 and see if that yields results, but I wanted to report the bug regardless.

Code: Select allExpand view
class FarmPeasant : MHCHumanoid
  Health 31;
  PainChance 200;
  Speed 8;
  Radius 20;
  Height 56;
  Scale 0.65;
  MinMissileChance 150;
  MaxStepHeight 16;
  MaxDropoffHeight 32;
  SeeSound "peasant/sight";
  AttackSound "peasant/attack";
  PainSound "peasant/pain";
  DeathSound "peasant/death";
  HitObituary "$OB_PEASANT"; // "%o should have never picked a fight with a civilian."
    VILA A 10 A_Look2();
    VILA AABBCCDD 5 A_Wander();
    Goto Spawn;
    PEAS E 10 A_FaceTarget();
    PEAS F 8 A_CustomMeleeAttack(2*random[PeasantAttack](1, 5)+2);
    PEAS E 8;
    Goto See;
    PEAS O 3;
    PEAS O 3 A_Pain();
    Goto Melee;
    PEAS G 5;
    PEAS H 10 A_GetHurt();
    PEAS I 6;
    Goto Wound+1;
    PEAS G 5;
    PEAS H 5 A_Scream;
    PEAS I 6;
    PEAS J 5 A_NoBlocking();
    PEAS K 5;
    PEAS L 6;
    PEAS M 8;
    PEAS N 1400;
    GIBS U 5;
    GIBS V 1400;
    GIBS M 5 A_TossGib();
    GIBS N 5 A_XScream();
    GIBS O 5 A_NoBlocking();
    GIBS PQRS 4 A_TossGib();
    Goto Death+8;

class VillagerB : FarmPeasant
         VILB A 10 A_Look2();
         VILB A 5 A_Wander();
         Goto Spawn;

class MHCHumanoid : actor
      MaxStepHeight 16;
      MaxDropoffHeight 32;
      CrushPainSound "misc/pcrush";
    BURN A 3 Bright A_PlaySoundEx("human/imonfire", "Voice");
    BURN B 3 Bright A_DropFire();
    BURN C 3 Bright A_Wander();
    BURN D 3 Bright A_NoBlocking();
    BURN E 5 Bright A_DropFire();
    BURN FGH 5 Bright A_Wander();
    BURN I 5 Bright A_DropFire();
    BURN JKL 5 Bright A_Wander();
    BURN M 5 Bright A_DropFire();
    BURN NOPQPQ 5 Bright;
    BURN RSTU 7 Bright;
    BURN V -1;
    DISR A 5 A_PlaySoundEx("misc/disruptordeath", "Voice");
    DISR BC 5;
    DISR D 5 A_NoBlocking();
    DISR EF 5;
    DISR GHIJ 4;
    MEAT D 700;
(31.04 KiB) Downloaded 1 time
Joined: 15 Dec 2017
Discord: katori#7607

Re: [3.7.1] Very Fatal Error with inherited ZScript actor

Postby Graf Zahl » Sun Jan 13, 2019 1:55 am

A_Look2 is a somewhat problematic function because it jumps to the 4 states following it without any good method to validate them. Your VillagerB only has one following state so it will jump to some state beyond that and access random data, interpreting it as a function call. And that will definitely crash. At the very least, you have to use 4 states in your See sequence, but keep in mind that these states are meant to display random standing animations
User avatar
Graf Zahl
Lead GZDoom Developer
Joined: 19 Jul 2003
Location: Germany

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