More small fixes

src/codegen/cpython_ast.cpp

@@ -421,6 +421,7 @@ public:
                 if (o->cls == unicode_cls) {
                     o = PyUnicode_AsUTF8String(o);
                     RELEASE_ASSERT(o, "");
+                    AUTO_DECREF(o);
 
                     auto r = new AST_Str();
                     r->str_data = static_cast<BoxedString*>(o)->s();

src/codegen/irgen/irgenerator.cpp

@@ -552,9 +552,10 @@ public:
     // to a function which could throw an exception, inspect the python call frame,...
     // Only patchpoint don't need to set the current statement because the stmt will be inluded in the stackmap args.
     void emitSetCurrentStmt(AST_stmt* stmt) {
-        getBuilder()->CreateStore(stmt ? embedRelocatablePtr(stmt, g.llvm_aststmt_type_ptr)
-                                       : getNullPtr(g.llvm_aststmt_type_ptr),
-                                  irstate->getStmtVar());
+        if (stmt)
+            getBuilder()->CreateStore(stmt ? embedRelocatablePtr(stmt, g.llvm_aststmt_type_ptr)
+                                           : getNullPtr(g.llvm_aststmt_type_ptr),
+                                      irstate->getStmtVar());
     }
 
     llvm::Instruction* createCall(const UnwindInfo& unw_info, llvm::Value* callee,

src/runtime/types.cpp

@@ -3973,6 +3973,9 @@ type_clear(PyTypeObject *type)
 }
 
 int HCAttrs::traverse(visitproc visit, void* arg) noexcept {
+    if (!hcls)
+        return 0;
+
     int nattrs = hcls->attributeArraySize();
     for (int i = 0; i < nattrs; i++) {
         Py_VISIT(attr_list->attrs[i]);
@@ -4845,7 +4848,7 @@ extern "C" void Py_Finalize() noexcept {
         PRINT_TOTAL_REFS();
 #ifdef Py_REF_DEBUG
 #ifdef Py_TRACE_REFS
-    if (_Py_RefTotal > 0)
+    if (_Py_RefTotal != 0)
         _Py_PrintReferenceAddressesCapped(stderr, 10);
 #endif