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py_panda: fix leak of reference counted class with inaccessible dtor

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If a class inherits from ReferenceCount, it can be destructed by downcasting to ReferenceCount, so it should not be an obstacle to properly clean it up when such a class is returned from C++.

This issue comes up when a CycleData is returned via MemoryUsagePointers, which is not exposed so is wrapped as NodeReferenceCount instead, which has a protected destructor.
This commit is contained in:
rdb 2018-06-22 20:49:19 +02:00
parent b0bbc66f06
commit 0367c73026
1 changed files with 11 additions and 1 deletions
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12
dtool/src/interrogatedb/py_panda.h
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@ -158,6 +158,16 @@ static void Dtool_FreeInstance_##CLASS_NAME(PyObject *self) {\
Py_TYPE(self)->tp_free(self);\
}
#define Define_Dtool_FreeInstanceRef_Private(CLASS_NAME,CNAME)\
static void Dtool_FreeInstance_##CLASS_NAME(PyObject *self) {\
if (DtoolInstance_VOID_PTR(self) != nullptr) {\
if (((Dtool_PyInstDef *)self)->_memory_rules) {\
unref_delete((ReferenceCount *)(CNAME *)DtoolInstance_VOID_PTR(self));\
}\
}\
Py_TYPE(self)->tp_free(self);\
}
#define Define_Dtool_Simple_FreeInstance(CLASS_NAME, CNAME)\
static void Dtool_FreeInstance_##CLASS_NAME(PyObject *self) {\
((Dtool_InstDef_##CLASS_NAME *)self)->_value.~##CLASS_NAME();\
@ -292,7 +302,7 @@ Define_Dtool_Class(MODULE_NAME,CLASS_NAME,PUBLIC_NAME)
#define Define_Module_ClassRef_Private(MODULE_NAME,CLASS_NAME,CNAME,PUBLIC_NAME)\
Define_Module_Class_Internal(MODULE_NAME,CLASS_NAME,CNAME)\
Define_Dtool_new(CLASS_NAME,CNAME)\
Define_Dtool_FreeInstance_Private(CLASS_NAME,CNAME)\
Define_Dtool_FreeInstanceRef_Private(CLASS_NAME,CNAME)\
Define_Dtool_Class(MODULE_NAME,CLASS_NAME,PUBLIC_NAME)
#define Define_Module_ClassRef(MODULE_NAME,CLASS_NAME,CNAME,PUBLIC_NAME)\