134     for (size_t i = 0; i < arkStackMap.size(); i += 2) { // 2:base and derive  in IteratorStackMap()
137         uintptr_t base = GetStackSlotAddress(baseInfo, callSiteSp, callsiteFp);  in IteratorStackMap()  local
139         if (*reinterpret_cast<uintptr_t *>(base) == 0) {  in IteratorStackMap()
140             base = derived;  in IteratorStackMap()
142         if (*reinterpret_cast<uintptr_t *>(base) != 0) {  in IteratorStackMap()
143             // The base address may be marked repeatedly  in IteratorStackMap()
144             if (baseSet.find(base) == baseSet.end()) {  in IteratorStackMap()
145                 baseSet.emplace(base, *reinterpret_cast<uintptr_t *>(base));  in IteratorStackMap()
146                 visitor(Root::ROOT_FRAME, ObjectSlot(base));  in IteratorStackMap()
149             if (base != derived) {  in IteratorStackMap()
150 …            derivedVisitor(Root::ROOT_FRAME, ObjectSlot(base), ObjectSlot(derived), baseSet[base]);  in IteratorStackMap()