Dennis Sweeney <sweeney.dennis...@gmail.com> added the comment:
I tried some debugging code:
diff --git a/Python/ceval.c b/Python/ceval.c
index f745067069..a8668dbac2 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -4864,6 +4864,18 @@ get_exception_handler(PyCodeObject *code, int index)
return res;
}
scan = skip_to_next_entry(scan);
+ if (scan
+ >= (unsigned char *)PyBytes_AS_STRING(code->co_exceptiontable)
+ + PyBytes_GET_SIZE(code->co_exceptiontable))
+ {
+ printf("co_name: --------------------------\n");
+ _PyObject_Dump(code->co_name);
+ printf("co_filename: ----------------------\n");
+ _PyObject_Dump(code->co_filename);
+ printf("co_exceptiontable: -------------\n");
+ _PyObject_Dump(code->co_exceptiontable);
+ printf("\n\n\n\n\n");
+ }
}
res.b_handler = -1;
return res;
It output this:
Python 3.11.0a0 (heads/main-dirty:092f9ddb5e, May 9 2021, 18:45:56) [MSC
v.1927 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from test.test_statistics import *
co_name: --------------------------
object address : 00000254B63EFB80
object refcount : 7
object type : 00007FFA1C7E71C0
object type name: str
object repr : '_find_and_load'
co_filename: ----------------------
object address : 00000254B63967A0
object refcount : 76
object type : 00007FFA1C7E71C0
object type name: str
object repr : '<frozen importlib._bootstrap>'
co_exceptiontable: -------------
object address : 00000254B63EB290
object refcount : 1
object type : 00007FFA1C7C9A40
object type name: bytes
object repr : b'\x84\x10"\x03\xa2\x04&\x0b\xa7\x03&\x0b'
>>> unittest.main()
............................................................................................................................................................................................................................................................................................................................................................................
----------------------------------------------------------------------
Ran 364 tests in 24.409s
OK
Here is the disassembly of the offending function:
>>> from dis import dis
>>> from importlib._bootstrap import _find_and_load
>>> dis(_find_and_load)
1024 0 LOAD_GLOBAL 0 (_ModuleLockManager)
2 LOAD_FAST 0 (name)
4 CALL_FUNCTION 1
6 BEFORE_WITH
8 POP_TOP
1025 10 LOAD_GLOBAL 1 (sys)
12 LOAD_ATTR 2 (modules)
14 LOAD_METHOD 3 (get)
16 LOAD_FAST 0 (name)
18 LOAD_GLOBAL 4 (_NEEDS_LOADING)
20 CALL_METHOD 2
22 STORE_FAST 2 (module)
1026 24 LOAD_FAST 2 (module)
26 LOAD_GLOBAL 4 (_NEEDS_LOADING)
28 IS_OP 0
30 POP_JUMP_IF_FALSE 27 (to 54)
1027 32 LOAD_GLOBAL 5 (_find_and_load_unlocked)
34 LOAD_FAST 0 (name)
36 LOAD_FAST 1 (import_)
38 CALL_FUNCTION 2
1024 40 ROT_TWO
42 LOAD_CONST 1 (None)
44 DUP_TOP
46 DUP_TOP
48 CALL_FUNCTION 3
50 POP_TOP
1027 52 RETURN_VALUE
1026 >> 54 NOP
1024 56 LOAD_CONST 1 (None)
58 DUP_TOP
60 DUP_TOP
62 CALL_FUNCTION 3
64 POP_TOP
66 JUMP_FORWARD 11 (to 90)
>> 68 PUSH_EXC_INFO
70 WITH_EXCEPT_START
72 POP_JUMP_IF_TRUE 39 (to 78)
74 RERAISE 4
>> 76 POP_EXCEPT_AND_RERAISE
>> 78 POP_TOP
80 POP_TOP
82 POP_TOP
84 POP_EXCEPT
86 POP_TOP
88 POP_TOP
1029 >> 90 LOAD_FAST 2 (module)
92 LOAD_CONST 1 (None)
94 IS_OP 0
96 POP_JUMP_IF_FALSE 60 (to 120)
1030 98 LOAD_CONST 2 ('import of {} halted; None in
sys.modules')
1031 100 LOAD_METHOD 6 (format)
102 LOAD_FAST 0 (name)
104 CALL_METHOD 1
1030 106 STORE_FAST 3 (message)
1032 108 LOAD_GLOBAL 7 (ModuleNotFoundError)
110 LOAD_FAST 3 (message)
112 LOAD_FAST 0 (name)
114 LOAD_CONST 3 (('name',))
116 CALL_FUNCTION_KW 2
118 RAISE_VARARGS 1
1034 >> 120 LOAD_GLOBAL 8 (_lock_unlock_module)
122 LOAD_FAST 0 (name)
124 CALL_FUNCTION 1
126 POP_TOP
1035 128 LOAD_FAST 2 (module)
130 RETURN_VALUE
ExceptionTable:
8 to 38 -> 68 [1] lasti
68 to 74 -> 76 [5] lasti
78 to 82 -> 76 [5] lasti
I don't know whether there just needs to be a sentinel 128 appended to all
co_exceptiontable, or if there is a more subtle bug.
----------
nosy: +Dennis Sweeney
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue40222>
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