Clean up summon/remove gameobject code.

src/server/game/Entities/GameObject/GameObject.cpp

@@ -91,27 +91,31 @@ void GameObject::CleanupsBeforeDelete(bool /*finalCleanup*/)
         RemoveFromWorld();
 
     if (m_uint32Values)                                      // field array can be not exist if GameOBject not loaded
-    {
+        RemoveFromOwner();
-        // Possible crash at access to deleted GO in Unit::m_gameobj
+}
-        if (uint64 owner_guid = GetOwnerGUID())
-        {
-            Unit* owner = ObjectAccessor::GetUnit(*this, owner_guid);
 
-            if (owner)
+void GameObject::RemoveFromOwner()
-                owner->RemoveGameObject(this, false);
+{
-            else
+    uint64 ownerGUID = GetOwnerGUID();
+    if (!ownerGUID)
+        return;
+
+    if (Unit* owner = ObjectAccessor::GetUnit(*this, ownerGUID))
     {
+        owner->RemoveGameObject(this, false);
+        ASSERT(!GetOwnerGUID());
+        return;
+    }
+
     const char * ownerType = "creature";
-                if (IS_PLAYER_GUID(owner_guid))
+    if (IS_PLAYER_GUID(ownerGUID))
         ownerType = "player";
-                else if (IS_PET_GUID(owner_guid))
+    else if (IS_PET_GUID(ownerGUID))
         ownerType = "pet";
 
-                sLog->outError("Delete GameObject (GUID: %u Entry: %u SpellId %u LinkedGO %u) that lost references to owner (GUID %u Type '%s') GO list. Crash possible later.",
+    sLog->outCrash("Delete GameObject (GUID: %u Entry: %u SpellId %u LinkedGO %u) that lost references to owner (GUID %u Type '%s') GO list. Crash possible later.",
-                    GetGUIDLow(), GetGOInfo()->entry, m_spellId, GetGOInfo()->GetLinkedGameObjectEntry(), GUID_LOPART(owner_guid), ownerType);
+        GetGUIDLow(), GetGOInfo()->entry, m_spellId, GetGOInfo()->GetLinkedGameObjectEntry(), GUID_LOPART(ownerGUID), ownerType);
-            }
+    SetOwnerGUID(0);
-        }
-    }
 }
 
 void GameObject::AddToWorld()
@@ -135,14 +139,7 @@ void GameObject::RemoveFromWorld()
         if (m_zoneScript)
             m_zoneScript->OnGameObjectRemove(this);
 
-        // Possible crash at access to deleted GO in Unit::m_gameobj
+        RemoveFromOwner();
-        if (uint64 owner_guid = GetOwnerGUID())
-        {
-            if (Unit* owner = GetOwner())
-                owner->RemoveGameObject(this, false);
-            else
-                sLog->outError("Delete GameObject (GUID: %u Entry: %u, Name: %s) that have references in not found creature %u GO list. Crash possible later.", GetGUIDLow(), GetGOInfo()->entry, GetGOInfo()->name.c_str(), GUID_LOPART(owner_guid));
-        }
         WorldObject::RemoveFromWorld();
         sObjectAccessor->RemoveObject(this);
     }
@@ -601,15 +598,8 @@ void GameObject::AddUniqueUse(Player* player)
 void GameObject::Delete()
 {
     SetLootState(GO_NOT_READY);
-    if (GetOwnerGUID())
+    RemoveFromOwner();
-    {
-        if (Unit* owner = GetOwner())
-            owner->RemoveGameObject(this, false);
-        else    //! Owner not in world anymore
-            SetOwnerGUID(0);
-    }
 
-    ASSERT (!GetOwnerGUID());
     SendObjectDeSpawnAnim(GetGUID());
 
     SetGoState(GO_STATE_READY);
@@ -1284,8 +1274,9 @@ void GameObject::Use(Unit* user)
                     {
                         player->UpdateFishingSkill();
 
+                        //TODO: I do not understand this hack. Need some explanation.
                         // prevent removing GO at spell cancel
-                        player->RemoveGameObject(this, false);
+                        RemoveFromOwner();
                         SetOwnerGUID(player->GetGUID());
 
                         //TODO: find reasonable value for fishing hole search

src/server/game/Entities/GameObject/GameObject.h

@@ -815,6 +815,7 @@ class GameObject : public WorldObject, public GridObject<GameObject>
 
         uint16 m_LootMode;                                  // bitmask, default LOOT_MODE_DEFAULT, determines what loot will be lootable
     private:
+        void RemoveFromOwner();
         void SwitchDoorOrButton(bool activate, bool alternative = false);
 
         //! Object distance/size - overridden from Object::_IsWithinDist. Needs to take in account proper GO size.

src/server/game/Entities/Unit/Unit.cpp

@@ -181,7 +181,8 @@ m_vehicleKit(NULL), m_unitTypeMask(UNIT_MASK_NONE), m_HostileRefManager(this)
     for (uint8 i = 0; i < MAX_SUMMON_SLOT; ++i)
         m_SummonSlot[i] = 0;
 
-    m_ObjectSlot[0] = m_ObjectSlot[1] = m_ObjectSlot[2] = m_ObjectSlot[3] = 0;
+    for (uint8 i = 0; i < MAX_GAMEOBJECT_SLOT; ++i)
+        m_ObjectSlot[i] = 0;
 
     m_auraUpdateIterator = m_ownedAuras.end();
 
@@ -4661,7 +4662,7 @@ void Unit::RemoveGameObject(GameObject* gameObj, bool del)
 
     gameObj->SetOwnerGUID(0);
 
-    for (uint32 i = 0; i < 4; ++i)
+    for (uint8 i = 0; i < MAX_GAMEOBJECT_SLOT; ++i)
     {
         if (m_ObjectSlot[i] == gameObj->GetGUID())
         {
@@ -4721,12 +4722,13 @@ void Unit::RemoveGameObject(uint32 spellid, bool del)
 void Unit::RemoveAllGameObjects()
 {
     // remove references to unit
-    for (GameObjectList::iterator i = m_gameObj.begin(); i != m_gameObj.end();)
+    while (!m_gameObj.empty())
     {
+        GameObjectList::iterator i = m_gameObj.begin();
         (*i)->SetOwnerGUID(0);
         (*i)->SetRespawnTime(0);
         (*i)->Delete();
-        i = m_gameObj.erase(i);
+        m_gameObj.erase(i);
     }
 }
 

src/server/game/Entities/Unit/Unit.h

@@ -1208,6 +1208,8 @@ enum ReactiveType
 #define SUMMON_SLOT_QUEST   6
 #define MAX_SUMMON_SLOT     7
 
+#define MAX_GAMEOBJECT_SLOT 4
+
 enum PlayerTotemType
 {
     SUMMON_TYPE_TOTEM_FIRE  = 63,
@@ -1891,7 +1893,7 @@ class Unit : public WorldObject
 
         uint32 m_addDmgOnce;
         uint64 m_SummonSlot[MAX_SUMMON_SLOT];
-        uint64 m_ObjectSlot[4];
+        uint64 m_ObjectSlot[MAX_GAMEOBJECT_SLOT];
 
         ShapeshiftForm GetShapeshiftForm() const { return ShapeshiftForm(GetByteValue(UNIT_FIELD_BYTES_2, 3)); }
         void SetShapeshiftForm(ShapeshiftForm form)