[SOT][DynamicShape] add flag for break graph on get symbolilc value (#69354)

Author: SigureMo

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

@@ -42,6 +42,7 @@
     log,
     printable,
 )
+from ....utils.envs import ENV_SOT_BREAK_GRAPH_ON_GET_SYMBOLIC_VALUE
 from ....utils.exceptions import HasNoAttributeError, InnerError
 from ..dispatch_functions import tensor_numel
 from ..guard import (
@@ -785,6 +786,8 @@ def disable_symbolic(var: VariableBase):
         )
 
     def get_py_value(self, allow_tensor: bool = False) -> bool | int | float:
+        if ENV_SOT_BREAK_GRAPH_ON_GET_SYMBOLIC_VALUE.get():
+            raise BreakGraphError("get_py_value from SymbolicVariable")
         self.need_guard_value = True
         if isinstance(self.value, SymbolicValue):
             assert isinstance(

python/paddle/jit/sot/utils/envs.py

@@ -46,6 +46,9 @@
 ENV_ENABLE_SOT_STEP_PROFILER = BooleanEnvironmentVariable(
     "ENABLE_SOT_STEP_PROFILER", False
 )
+ENV_SOT_BREAK_GRAPH_ON_GET_SYMBOLIC_VALUE = BooleanEnvironmentVariable(
+    "SOT_BREAK_GRAPH_ON_GET_SYMBOLIC_VALUE", False
+)
 
 
 @contextmanager