83 lines
2.0 KiB
Python
83 lines
2.0 KiB
Python
import inspect
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from opcode import opname
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from collections import defaultdict
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def get_var_name(frame):
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code = frame.f_code
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call_index = frame.f_lasti
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if opname[code.co_code[call_index]] != "CALL_FUNCTION":
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return None
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index = call_index+3
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while True:
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opc = opname[code.co_code[index]]
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if opc == "STORE_NAME" or opc == "STORE_ATTR":
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name_index = int(code.co_code[index+1])
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return code.co_names[name_index]
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elif opc == "STORE_FAST":
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name_index = int(code.co_code[index+1])
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return code.co_varnames[name_index]
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elif opc == "STORE_DEREF":
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name_index = int(code.co_code[index+1])
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return code.co_cellvars[name_index]
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elif opc == "LOAD_GLOBAL" or opc == "LOAD_ATTR" or opc == "LOAD_FAST":
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index += 3
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elif opc == "DUP_TOP":
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index += 1
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elif opc == "BUILD_LIST":
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index += 3
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else:
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return None
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name_to_idx = defaultdict(int)
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classname_to_objs = dict()
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def index_id(l, obj):
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for n, e in enumerate(l):
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if id(e) == id(obj):
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return n
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raise ValueError
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def trace_back(varname=None):
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l = []
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frame = inspect.currentframe().f_back.f_back
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while frame is not None:
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if varname is None:
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varname = get_var_name(frame)
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if varname is not None:
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l.insert(0, (varname, name_to_idx[varname]))
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name_to_idx[varname] += 1
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try:
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obj = frame.f_locals["self"]
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except KeyError:
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obj = None
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if hasattr(obj, "__del__"):
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obj = None
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if obj is None:
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if varname is not None:
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coname = frame.f_code.co_name
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if coname == "<module>":
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modules = frame.f_globals["__name__"]
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modules = modules.split(".")
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coname = modules[len(modules)-1]
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l.insert(0, (coname, -1))
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else:
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classname = obj.__class__.__name__.lower()
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try:
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objs = classname_to_objs[classname]
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except KeyError:
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classname_to_objs[classname] = [obj]
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idx = 0
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else:
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try:
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idx = index_id(objs, obj)
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except ValueError:
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idx = len(objs)
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objs.append(obj)
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l.insert(0, (classname, idx))
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varname = None
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frame = frame.f_back
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return l
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