libdeng|Str|Debug: Verify that AutoStr instances are not manually del…

…eted

AutoStr instances must only be deleted by the garbage recycler. Added
an assertion to verify that Str_Delete() is not called on AutoStrs.

doomsday/libdeng/src/garbage.cpp

@@ -32,6 +32,10 @@ struct Garbage
 {
     typedef std::map<void*, GarbageDestructor> Allocs; // O(log n) search
     Allocs allocs;
+    bool beingRecycled;
+
+    Garbage() : beingRecycled(false)
+    {}
 
     ~Garbage()
     {
@@ -40,6 +44,8 @@ struct Garbage
 
     bool contains(const void* ptr) const
     {
+        if(beingRecycled) return false;
+
         Allocs::const_iterator i = allocs.find(const_cast<void*>(ptr));
         return i != allocs.end();
     }
@@ -48,6 +54,8 @@ struct Garbage
     {
         if(allocs.empty()) return;
 
+        beingRecycled = true;
+
         LOG_DEBUG("Recycling %i allocations/instances.") << allocs.size();
 
         for(Allocs::iterator i = allocs.begin(); i != allocs.end(); ++i)
@@ -56,6 +64,8 @@ struct Garbage
             i->second(i->first);
         }
         allocs.clear();
+
+        beingRecycled = false;
     }
 };
 
@@ -129,6 +139,7 @@ void Garbage_TrashInstance(void* ptr, GarbageDestructor destructor)
 
 boolean Garbage_IsTrashed(const void* ptr)
 {
+    if(!garbages) return false;
     Garbage* g = garbageForThread(Sys_CurrentThreadId());
     return g->contains(ptr);
 }

doomsday/libdeng/src/str.c

@@ -191,7 +191,7 @@ ddstring_t* Str_NewFromReader(Reader* reader)
     return str;
 }
 
-void Str_Delete(ddstring_t* str)
+static void deleteString(Str* str)
 {
     DENG_ASSERT(str);
     if(!str) return;
@@ -200,6 +200,18 @@ void Str_Delete(ddstring_t* str)
     M_Free(str);
 }
 
+void Str_Delete(Str* str)
+{
+    DENG_ASSERT(!Garbage_IsTrashed(str));
+
+    if(Garbage_IsTrashed(str))
+    {
+        LegacyCore_FatalError("Str_Delete: Trying to manually delete an AutoStr!");
+    }
+
+    deleteString(str);
+}
+
 ddstring_t* Str_Clear(ddstring_t* str)
 {
     return Str_Set(str, "");
@@ -807,10 +819,15 @@ AutoStr* AutoStr_NewStd(void)
     return AutoStr_FromStr(Str_NewStd());
 }
 
-AutoStr* AutoStr_FromStr(ddstring_t* str)
+void AutoStr_Delete(AutoStr* as)
+{
+    deleteString(as);
+}
+
+AutoStr* AutoStr_FromStr(Str* str)
 {
     DENG_ASSERT(str);
-    Garbage_TrashInstance(str, (GarbageDestructor) Str_Delete);
+    Garbage_TrashInstance(str, (GarbageDestructor) AutoStr_Delete);
     return str;
 }