python/paddle/jit/sot/opcode_translator/executor/function_graph.py:331

• Since the C++ side now throws a runtime error when the guard chain is empty, please verify that generating a dummy guard chain here consistently prevents empty guard chains in all execution scenarios.

guard_chain: GuardChain = [
                paddle.framework.core.GuardNode(
                    paddle.framework.core.DummyGuard(),
                    [paddle.framework.core.ConstantExprNode(True)],
                )
            ]

paddle/fluid/pybind/sot/guards.cc:405

• The updated behavior now throws an exception when the guard chain is empty. Please verify that all cases leading to an empty guard chain are either updated to supply a valid dummy guard or handled appropriately to prevent unexpected runtime failures.

throw std::runtime_error("Empty guard chain");

python/paddle/jit/sot/opcode_translator/executor/variables/basic.py:342

• Confirm that the PIR API check correctly reflects the runtime environment. If PIR is not enabled, ensure that falling back to object_equal_faster_guard still provides adequate guard coverage.

assert paddle.framework.use_pir_api(), "Only support PIR"