Globals read only inside a class body defined in a by-value function are not pickled (NameError after loading)
维护者通常 9 天内回复
还没有人认领这个 Issue。
评估
调研方向
Start by reading _extract_code_globals around GLOBAL_OPS in cloudpickle/cloudpickle.py, then inspect _function_getstate and the base_globals path in _function_getnewargs identified in the issue. Reproduce the provided example and check the related class-scope opcode cases across the listed Python versions. Done means the globals used by those class scopes are available after loading, with regression tests covering the reported cases.
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描述
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A global that a by-value function reads only inside the body of a class it defines is not pickled, so the loaded function raises NameError. This happens on Python 3.11 through 3.14, with cloudpickle 3.1.2 and with master (4af5936).
import subprocess, sys
import cloudpickle
ns = {"__name__": "not_importable", "CONST": 42} # not importable, so f is pickled by value
exec("def f():\n class Rec:\n q = CONST\n return Rec.q\n", ns)
print("local:", ns["f"]())
load = "import pickle, sys; print(pickle.loads(sys.stdin.buffer.read())())"
r = subprocess.run([sys.executable, "-c", load], input=cloudpickle.dumps(ns["f"]), capture_output=True)
print("loaded:", (r.stdout or r.stderr).decode().strip().splitlines()[-1])
Output on 3.11.15, 3.12.10, 3.13.3 and 3.14.6:
local: 42
loaded: NameError: name 'CONST' is not defined
Other class-scope reads fail the same way:
- a field annotation naming a global, for example a dataclass
p: Pointdefined inside the function (measured on 3.13 and 3.14); - a class-scoped
type Inner = Galias, once its value is evaluated (measured on 3.12, 3.13 and 3.14).
Cause: _extract_code_globals only collects names from GLOBAL_OPS, which is STORE_GLOBAL, DELETE_GLOBAL and LOAD_GLOBAL (L388-L397). Inside a class scope, the compiler reads names with other opcodes (measured with dis):
- class-body statements, and annotations before 3.14, use
LOAD_NAME(3.11-3.14); - a class's
__annotate__function (3.14) and a class-scopedtypealias value (3.12+) useLOAD_FROM_DICT_OR_GLOBALS.
Suggested fix: add LOAD_NAME to GLOBAL_OPS, and also LOAD_FROM_DICT_OR_GLOBALS on 3.12+. Both consumers already keep only names present in func.__globals__, so class-local names collected this way are dropped:
_function_getstate(L734-L735);- the
base_globalspath in_function_getnewargs(L1307-L1314).
Related: #608.
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