From 3db7d9ad8459f36aa7c3d80594c6725edae72231 Mon Sep 17 00:00:00 2001 From: Christoph Oelckers Date: Sun, 18 Sep 2016 12:22:56 +0200 Subject: [PATCH 1/3] - fixed: AActor::alternative was not declared as a pointer. --- src/p_mobj.cpp | 1 + 1 file changed, 1 insertion(+) diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp index 6d8ce44182..e93b886e87 100644 --- a/src/p_mobj.cpp +++ b/src/p_mobj.cpp @@ -140,6 +140,7 @@ IMPLEMENT_POINTY_CLASS (AActor) DECLARE_POINTER (master) DECLARE_POINTER (Poisoner) DECLARE_POINTER (Damage) + DECLARE_POINTER (alternative) END_POINTERS AActor::~AActor () From f1ba19073fce4af02298056b93bd78ff16313822 Mon Sep 17 00:00:00 2001 From: Christoph Oelckers Date: Mon, 19 Sep 2016 03:36:51 +0200 Subject: [PATCH 2/3] - split Damage into two variables: DamageVal for the old constant and DamageFunc for the DECORATE function. The way this was done was a major headache inducer, requiring reconstruction of the function each time the value was changed and in general made actor damage a major hassle. There was a DECORATE wrapper to mimic the original behavior but this looked quite broken because it completely ignored the different semantics of both damage calculation types. It also made it impossible to determine if damage was a function or a value. This accessor has been reverted to what it should be, only returning the constant, which now is -1 for a damage function. I am sorry if this may break the odd mod out but a quick look over some DECORATE-heavy stuff showed that this was never combined in any of them so that accessing 'damage' in DECORATE code depended on an actual damage function. To get proper damage, a future commit will add a DECORATE function which calls AActor::GetMissileDamage. --- src/actor.h | 23 +++++- src/d_dehacked.cpp | 2 +- src/g_doom/a_bossbrain.cpp | 2 +- src/g_heretic/a_ironlich.cpp | 4 +- src/g_hexen/a_magelightning.cpp | 2 +- src/info.cpp | 2 +- src/p_acs.cpp | 2 +- src/p_map.cpp | 2 +- src/p_mobj.cpp | 115 ++++++--------------------- src/thingdef/olddecorations.cpp | 3 +- src/thingdef/thingdef.cpp | 12 +-- src/thingdef/thingdef_data.cpp | 1 + src/thingdef/thingdef_exp.h | 17 +--- src/thingdef/thingdef_expression.cpp | 74 +---------------- src/thingdef/thingdef_parse.cpp | 16 ++-- src/thingdef/thingdef_properties.cpp | 11 ++- 16 files changed, 81 insertions(+), 207 deletions(-) diff --git a/src/actor.h b/src/actor.h index 522405dd6b..d804b09953 100644 --- a/src/actor.h +++ b/src/actor.h @@ -111,6 +111,8 @@ struct FPortalGroupArray; // Any questions? // + + // --- mobj.flags --- enum ActorFlag { @@ -1014,7 +1016,9 @@ public: SDWORD tics; // state tic counter FState *state; - VMFunction *Damage; // For missiles and monster railgun + //VMFunction *Damage; // For missiles and monster railgun + int DamageVal; + VMFunction *DamageFunc; int projectileKickback; ActorFlags flags; ActorFlags2 flags2; // Heretic flags @@ -1201,6 +1205,23 @@ public: FState *GetRaiseState(); void Revive(); + void SetDamage(int dmg) + { + DamageVal = dmg; + DamageFunc = nullptr; + } + + bool IsZeroDamage() const + { + return DamageVal == 0 && DamageFunc == nullptr; + } + + void RestoreDamage() + { + DamageVal = GetDefault()->DamageVal; + DamageFunc = GetDefault()->DamageFunc; + } + FState *FindState (FName label) const { return GetClass()->FindState(1, &label); diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp index 4beb5c25a5..dfa4f56f0a 100644 --- a/src/d_dehacked.cpp +++ b/src/d_dehacked.cpp @@ -915,7 +915,7 @@ static int PatchThing (int thingy) } else if (linelen == 14 && stricmp (Line1, "Missile damage") == 0) { - info->Damage = CreateDamageFunction(val); + info->SetDamage(val); } else if (linelen == 5) { diff --git a/src/g_doom/a_bossbrain.cpp b/src/g_doom/a_bossbrain.cpp index 5d10e01382..e6fd5f16df 100644 --- a/src/g_doom/a_bossbrain.cpp +++ b/src/g_doom/a_bossbrain.cpp @@ -47,7 +47,7 @@ static void BrainishExplosion (const DVector3 &pos) boom->SetState (state); } boom->effects = 0; - boom->Damage = NULL; // disables collision detection which is not wanted here + boom->SetDamage(0); // disables collision detection which is not wanted here boom->tics -= pr_brainscream() & 7; if (boom->tics < 1) boom->tics = 1; diff --git a/src/g_heretic/a_ironlich.cpp b/src/g_heretic/a_ironlich.cpp index 7f33fb57a9..a887484070 100644 --- a/src/g_heretic/a_ironlich.cpp +++ b/src/g_heretic/a_ironlich.cpp @@ -115,7 +115,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichAttack) fire->target = baseFire->target; fire->Angles.Yaw = baseFire->Angles.Yaw; fire->Vel = baseFire->Vel; - fire->Damage = NULL; + fire->SetDamage(0); fire->health = (i+1) * 2; P_CheckMissileSpawn (fire, self->radius); } @@ -205,7 +205,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LichFireGrow) self->AddZ(9.); if (self->health == 0) { - self->Damage = self->GetDefault()->Damage; + self->RestoreDamage(); self->SetState (self->FindState("NoGrow")); } return 0; diff --git a/src/g_hexen/a_magelightning.cpp b/src/g_hexen/a_magelightning.cpp index b5718f4d79..896384f4e4 100644 --- a/src/g_hexen/a_magelightning.cpp +++ b/src/g_hexen/a_magelightning.cpp @@ -340,7 +340,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_LastZap) { mo->SetState (mo->FindState (NAME_Death)); mo->Vel.Z = 40; - mo->Damage = NULL; + mo->SetDamage(0); } return 0; } diff --git a/src/info.cpp b/src/info.cpp index 7198a5de40..6eeca1186b 100644 --- a/src/info.cpp +++ b/src/info.cpp @@ -344,7 +344,7 @@ size_t PClassActor::PropagateMark() // Mark damage function if (Defaults != NULL) { - GC::Mark(((AActor *)Defaults)->Damage); + GC::Mark(((AActor *)Defaults)->DamageFunc); } // marked += ActorInfo->NumOwnedStates * sizeof(FState); diff --git a/src/p_acs.cpp b/src/p_acs.cpp index 67ae377717..ffac7a78f1 100644 --- a/src/p_acs.cpp +++ b/src/p_acs.cpp @@ -3791,7 +3791,7 @@ void DLevelScript::DoSetActorProperty (AActor *actor, int property, int value) break; case APROP_Damage: - actor->Damage = CreateDamageFunction(value); + actor->SetDamage(value); break; case APROP_Alpha: diff --git a/src/p_map.cpp b/src/p_map.cpp index 7316e1c96b..5cc9bdf72c 100644 --- a/src/p_map.cpp +++ b/src/p_map.cpp @@ -1320,7 +1320,7 @@ bool PIT_CheckThing(FMultiBlockThingsIterator &it, FMultiBlockThingsIterator::Ch // [RH] What is the point of this check, again? In Hexen, it is unconditional, // but here we only do it if the missile's damage is 0. // MBF bouncer might have a non-0 damage value, but they must not deal damage on impact either. - if ((tm.thing->BounceFlags & BOUNCE_Actors) && (tm.thing->Damage == 0 || !(tm.thing->flags & MF_MISSILE))) + if ((tm.thing->BounceFlags & BOUNCE_Actors) && (tm.thing->IsZeroDamage() || !(tm.thing->flags & MF_MISSILE))) { return (tm.thing->target == thing || !(thing->flags & MF_SOLID)); } diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp index e93b886e87..d38901f1e1 100644 --- a/src/p_mobj.cpp +++ b/src/p_mobj.cpp @@ -139,7 +139,7 @@ IMPLEMENT_POINTY_CLASS (AActor) DECLARE_POINTER (LastHeard) DECLARE_POINTER (master) DECLARE_POINTER (Poisoner) - DECLARE_POINTER (Damage) + DECLARE_POINTER (DamageFunc) DECLARE_POINTER (alternative) END_POINTERS @@ -149,73 +149,6 @@ AActor::~AActor () // Use Destroy() instead. } -//========================================================================== -// -// CalcDamageValue -// -// Given a script function, returns an integer to represent it in a -// savegame. This encoding is compatible with previous incarnations -// where damage was an integer. -// -// 0 : use null function -// 0x40000000 : use default function -// anything else : use function that returns this number -// -//========================================================================== - -static int CalcDamageValue(VMFunction *func) -{ - if (func == NULL) - { - return 0; - } - VMScriptFunction *sfunc = dyn_cast(func); - if (sfunc == NULL) - { - return 0x40000000; - } - VMOP *op = sfunc->Code; - // If the function was created by CreateDamageFunction(), extract - // the value used to create it and return that. Otherwise, return - // indicating to use the default function. - if (op->op == OP_RETI && op->a == 0) - { - return op->i16; - } - if (op->op == OP_RET && op->a == 0 && op->b == (REGT_INT | REGT_KONST)) - { - return sfunc->KonstD[op->c]; - } - return 0x40000000; -} - -//========================================================================== -// -// UncalcDamageValue -// -// Given a damage integer, returns a script function for it. -// -//========================================================================== - -static VMFunction *UncalcDamageValue(int dmg, VMFunction *def) -{ - if (dmg == 0) - { - return NULL; - } - if ((dmg & 0xC0000000) == 0x40000000) - { - return def; - } - // Does the default version return this? If so, use it. Otherwise, - // create a new function. - if (CalcDamageValue(def) == dmg) - { - return def; - } - return CreateDamageFunction(dmg); -} - //========================================================================== // // AActor :: Serialize @@ -263,18 +196,16 @@ void AActor::Serialize(FArchive &arc) << projectilepassheight << Vel << tics - << state; - if (arc.IsStoring()) + << state + << DamageVal; + if (DamageVal == 0x40000000 || DamageVal == -1) { - int dmg; - dmg = CalcDamageValue(Damage); - arc << dmg; + DamageVal = -1; + DamageFunc = GetDefault()->DamageFunc; } else { - int dmg; - arc << dmg; - Damage = UncalcDamageValue(dmg, GetDefault()->Damage); + DamageFunc = nullptr; } P_SerializeTerrain(arc, floorterrain); arc << projectileKickback @@ -2975,8 +2906,21 @@ CCMD(utid) int AActor::GetMissileDamage (int mask, int add) { - if (Damage == NULL) + if (DamageVal >= 0) { + if (mask == 0) + { + return add * DamageVal; + } + else + { + return ((pr_missiledamage() & mask) + add) * DamageVal; + } + } + if (DamageFunc == nullptr) + { + // This should never happen + assert(false && "No damage function found"); return 0; } VMFrameStack stack; @@ -2988,22 +2932,11 @@ int AActor::GetMissileDamage (int mask, int add) results[0].IntAt(&amount); results[1].IntAt(&calculated); - if (stack.Call(Damage, ¶m, 1, results, 2) < 1) + if (stack.Call(DamageFunc, ¶m, 1, results, 2) < 1) { // No results return 0; } - if (calculated) - { - return amount; - } - else if (mask == 0) - { - return add * amount; - } - else - { - return ((pr_missiledamage() & mask) + add) * amount; - } + return amount; } void AActor::Howl () @@ -3695,7 +3628,7 @@ void AActor::Tick () // still have missiles that go straight up and down through actors without // damaging anything. // (for backwards compatibility this must check for lack of damage function, not for zero damage!) - if ((flags & MF_MISSILE) && Vel.X == 0 && Vel.Y == 0 && Damage != NULL) + if ((flags & MF_MISSILE) && Vel.X == 0 && Vel.Y == 0 && !IsZeroDamage()) { Vel.X = MinVel; } diff --git a/src/thingdef/olddecorations.cpp b/src/thingdef/olddecorations.cpp index 5fa9942622..3ea0c4788a 100644 --- a/src/thingdef/olddecorations.cpp +++ b/src/thingdef/olddecorations.cpp @@ -496,8 +496,7 @@ static void ParseInsideDecoration (Baggage &bag, AActor *defaults, else if (def == DEF_Projectile && sc.Compare ("Damage")) { sc.MustGetNumber (); - FxDamageValue *x = new FxDamageValue(new FxConstant(sc.Number, sc), false); - defaults->Damage = (VMFunction *)(uintptr_t)(ActorDamageFuncs.Push(x) + 1); + defaults->SetDamage(sc.Number); } else if (def == DEF_Projectile && sc.Compare ("DamageType")) { diff --git a/src/thingdef/thingdef.cpp b/src/thingdef/thingdef.cpp index dfc960627e..6356371493 100644 --- a/src/thingdef/thingdef.cpp +++ b/src/thingdef/thingdef.cpp @@ -348,12 +348,12 @@ static void FinishThingdef() continue; } - if (def->Damage != NULL) + if (def->DamageFunc != nullptr) { - FxDamageValue *dmg = (FxDamageValue *)ActorDamageFuncs[(uintptr_t)def->Damage - 1]; + FxDamageValue *dmg = (FxDamageValue *)ActorDamageFuncs[(uintptr_t)def->DamageFunc - 1]; VMScriptFunction *sfunc; sfunc = dmg->GetFunction(); - if (sfunc == NULL) + if (sfunc == nullptr) { FCompileContext ctx(ti); dmg = static_cast(dmg->Resolve(ctx)); @@ -365,15 +365,15 @@ static void FinishThingdef() dmg->Emit(&buildit); sfunc = buildit.MakeFunction(); sfunc->NumArgs = 1; - sfunc->Proto = NULL; ///FIXME: Need a proper prototype here + sfunc->Proto = nullptr; ///FIXME: Need a proper prototype here // Save this function in case this damage value was reused // (which happens quite easily with inheritance). dmg->SetFunction(sfunc); } } - def->Damage = sfunc; + def->DamageFunc = sfunc; - if (dump != NULL && sfunc != NULL) + if (dump != nullptr && sfunc != nullptr) { char label[64]; int labellen = mysnprintf(label, countof(label), "Function %s.Damage", diff --git a/src/thingdef/thingdef_data.cpp b/src/thingdef/thingdef_data.cpp index 756c56a1a3..8248634a38 100644 --- a/src/thingdef/thingdef_data.cpp +++ b/src/thingdef/thingdef_data.cpp @@ -666,4 +666,5 @@ void InitThingdef() symt.AddSymbol(new PField(NAME_Speed, TypeFloat64, VARF_Native, myoffsetof(AActor, Speed))); symt.AddSymbol(new PField(NAME_Threshold, TypeSInt32, VARF_Native|VARF_ReadOnly, myoffsetof(AActor, threshold))); symt.AddSymbol(new PField(NAME_DefThreshold, TypeSInt32, VARF_Native|VARF_ReadOnly, myoffsetof(AActor, DefThreshold))); + symt.AddSymbol(new PField(NAME_Damage, TypeSInt32, VARF_Native|VARF_ReadOnly, myoffsetof(AActor, DamageVal))); } diff --git a/src/thingdef/thingdef_exp.h b/src/thingdef/thingdef_exp.h index 2f06e085e2..5fe8f252f9 100644 --- a/src/thingdef/thingdef_exp.h +++ b/src/thingdef/thingdef_exp.h @@ -854,20 +854,6 @@ public: ExpEmit Emit(VMFunctionBuilder *build); }; -//========================================================================== -// -// FxDamage -// -//========================================================================== - -class FxDamage : public FxExpression -{ -public: - FxDamage(const FScriptPosition&); - FxExpression *Resolve(FCompileContext&); - ExpEmit Emit(VMFunctionBuilder *build); -}; - //========================================================================== // // FxArrayElement @@ -1188,12 +1174,11 @@ public: class FxDamageValue : public FxExpression { FxExpression *val; - bool Calculated; VMScriptFunction *MyFunction; public: - FxDamageValue(FxExpression *v, bool calc); + FxDamageValue(FxExpression *v); ~FxDamageValue(); FxExpression *Resolve(FCompileContext&); diff --git a/src/thingdef/thingdef_expression.cpp b/src/thingdef/thingdef_expression.cpp index 034c304c20..ce603f2617 100644 --- a/src/thingdef/thingdef_expression.cpp +++ b/src/thingdef/thingdef_expression.cpp @@ -3218,11 +3218,6 @@ FxExpression *FxIdentifier::Resolve(FCompileContext& ctx) ScriptPosition.Message(MSG_ERROR, "Invalid member identifier '%s'\n", Identifier.GetChars()); } } - // the damage property needs special handling - else if (Identifier == NAME_Damage) - { - newex = new FxDamage(ScriptPosition); - } // now check the global identifiers. else if ((sym = ctx.FindGlobal(Identifier)) != NULL) { @@ -3316,65 +3311,6 @@ ExpEmit FxSelf::Emit(VMFunctionBuilder *build) } -//========================================================================== -// -// -// -//========================================================================== - -FxDamage::FxDamage(const FScriptPosition &pos) -: FxExpression(pos) -{ -} - -//========================================================================== -// -// FxDamage :: Resolve -// -//========================================================================== - -FxExpression *FxDamage::Resolve(FCompileContext& ctx) -{ - CHECKRESOLVED(); - ValueType = TypeSInt32; - return this; -} - -//========================================================================== -// -// FxDamage :: Emit -// -// Call this actor's damage function, if it has one -// -//========================================================================== - -ExpEmit FxDamage::Emit(VMFunctionBuilder *build) -{ - ExpEmit dmgval(build, REGT_INT); - - // Get damage function - ExpEmit dmgfunc(build, REGT_POINTER); - build->Emit(OP_LO, dmgfunc.RegNum, 0/*self*/, build->GetConstantInt(myoffsetof(AActor, Damage))); - - // If it's non-null... - build->Emit(OP_EQA_K, 1, dmgfunc.RegNum, build->GetConstantAddress(nullptr, ATAG_GENERIC)); - size_t nulljump = build->Emit(OP_JMP, 0); - - // ...call it - build->Emit(OP_PARAM, 0, REGT_POINTER, 0/*self*/); - build->Emit(OP_CALL, dmgfunc.RegNum, 1, 1); - build->Emit(OP_RESULT, 0, REGT_INT, dmgval.RegNum); - size_t notnulljump = build->Emit(OP_JMP, 0); - - // Otherwise, use 0 - build->BackpatchToHere(nulljump); - build->EmitLoadInt(dmgval.RegNum, 0); - build->BackpatchToHere(notnulljump); - - return dmgval; -} - - //========================================================================== // // @@ -5225,18 +5161,12 @@ ExpEmit FxMultiNameState::Emit(VMFunctionBuilder *build) // //========================================================================== -FxDamageValue::FxDamageValue(FxExpression *v, bool calc) +FxDamageValue::FxDamageValue(FxExpression *v) : FxExpression(v->ScriptPosition) { val = v; ValueType = TypeVoid; - Calculated = calc; MyFunction = NULL; - - if (!calc) - { - assert(v->isConstant() && "Non-calculated damage must be constant"); - } } FxDamageValue::~FxDamageValue() @@ -5272,7 +5202,7 @@ ExpEmit FxDamageValue::Emit(VMFunctionBuilder *build) assert(emitval.RegType == REGT_INT); build->Emit(OP_RET, 0, REGT_INT | (emitval.Konst ? REGT_KONST : 0), emitval.RegNum); } - build->Emit(OP_RETI, 1 | RET_FINAL, Calculated); + build->Emit(OP_RETI, 1 | RET_FINAL, true); return ExpEmit(); } diff --git a/src/thingdef/thingdef_parse.cpp b/src/thingdef/thingdef_parse.cpp index b99f1a3842..963165ab13 100644 --- a/src/thingdef/thingdef_parse.cpp +++ b/src/thingdef/thingdef_parse.cpp @@ -865,19 +865,21 @@ static bool ParsePropertyParams(FScanner &sc, FPropertyInfo *prop, AActor *defau if (sc.CheckString ("(")) { - x = new FxDamageValue(new FxIntCast(ParseExpression(sc, bag.Info)), true); + conv.i = -1; + params.Push(conv); + x = new FxDamageValue(new FxIntCast(ParseExpression(sc, bag.Info))); sc.MustGetStringName(")"); + conv.exp = x; + params.Push(conv); + } else { sc.MustGetNumber(); - if (sc.Number != 0) - { - x = new FxDamageValue(new FxConstant(sc.Number, bag.ScriptPosition), false); - } + conv.i = sc.Number; + params.Push(conv); + conv.exp = nullptr; } - conv.exp = x; - params.Push(conv); } break; diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp index f6ad511afe..52194435b4 100644 --- a/src/thingdef/thingdef_properties.cpp +++ b/src/thingdef/thingdef_properties.cpp @@ -636,7 +636,8 @@ DEFINE_PROPERTY(threshold, I, Actor) //========================================================================== DEFINE_PROPERTY(damage, X, Actor) { - PROP_EXP_PARM(id, 0); + PROP_INT_PARM(dmgval, 0); + PROP_EXP_PARM(id, 1); // Damage can either be a single number, in which case it is subject // to the original damage calculation rules. Or, it can be an expression @@ -646,13 +647,15 @@ DEFINE_PROPERTY(damage, X, Actor) // Store this expression here for now. It will be converted to a function // later once all actors have been processed. - if (id == NULL) + defaults->DamageVal = dmgval; + + if (id == nullptr) { - defaults->Damage = NULL; + defaults->DamageFunc = nullptr; } else { - defaults->Damage = (VMFunction *)(uintptr_t)(ActorDamageFuncs.Push(id) + 1); + defaults->DamageFunc = (VMFunction *)(uintptr_t)(ActorDamageFuncs.Push(id) + 1); } } From 3eb1af6957541fa8ac021d9aa8aaf8218e8c9d6a Mon Sep 17 00:00:00 2001 From: Christoph Oelckers Date: Mon, 19 Sep 2016 03:45:22 +0200 Subject: [PATCH 3/3] - added a GetMissileDamage function to DECORATE which can be used to properly retrieve an actor's damage value. The damage property should be considered deprecated inside expressions from now on. --- src/thingdef/thingdef_codeptr.cpp | 32 +++++++++++++++++++++++++++++++ wadsrc/static/actors/actor.txt | 1 + 2 files changed, 33 insertions(+) diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp index 642f132af9..21551364bc 100644 --- a/src/thingdef/thingdef_codeptr.cpp +++ b/src/thingdef/thingdef_codeptr.cpp @@ -231,6 +231,38 @@ DEFINE_ACTION_FUNCTION(AActor, CheckClass) return 0; } +//========================================================================== +// +// CheckClass +// +// NON-ACTION function to calculate missile damage for the given actor +// +//========================================================================== + +DEFINE_ACTION_FUNCTION(AActor, GetMissileDamage) +{ + if (numret > 0) + { + assert(ret != NULL); + PARAM_SELF_PROLOGUE(AActor); + PARAM_INT(mask); + PARAM_INT(add) + PARAM_INT_OPT(pick_pointer) { pick_pointer = AAPTR_DEFAULT; } + + self = COPY_AAPTR(self, pick_pointer); + if (self == NULL) + { + ret->SetInt(0); + } + else + { + ret->SetInt(self->GetMissileDamage(mask, add)); + } + return 1; + } + return 0; +} + //========================================================================== // // IsPointerEqual diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt index b8bbcab145..b8b805219f 100644 --- a/wadsrc/static/actors/actor.txt +++ b/wadsrc/static/actors/actor.txt @@ -53,6 +53,7 @@ ACTOR Actor native //: Thinker native int CountProximity(class classname, float distance, int flags = 0, int ptr = AAPTR_DEFAULT); native float GetSpriteAngle(int ptr = AAPTR_DEFAULT); native float GetSpriteRotation(int ptr = AAPTR_DEFAULT); + native int GetMissileDamage(int mask, int add, int ptr = AAPTR_DEFAULT); // Action functions // Meh, MBF redundant functions. Only for DeHackEd support.