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gh-135700: Fix instructions in __annotate__ have incorrect code positions #136543

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gh-135700: Fix instructions in __annotate__ have incorrect code positions #136543

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4b2ec1e
fix instructions in __annotate__ have incorrect code positions
AndPuQing Jun 22, 2025
35246e7
📜🤖 Added by blurb_it.
blurb-it[bot] Jun 22, 2025
97bddb8
Update Misc/NEWS.d/next/Core_and_Builtins/2025-06-22-10-47-27.gh-issu…
AndPuQing Jun 22, 2025
4de616a
add unit tests
AndPuQing Jun 22, 2025
a297926
Update Lib/test/test_pdb.py
AndPuQing Jul 13, 2025
5820ce8
fix codegen in annotations
AndPuQing Jul 13, 2025
850601a
add empty check
AndPuQing Jul 13, 2025
0e14a6d
assert deferred_anno is not empty
AndPuQing Jul 13, 2025
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25 changes: 25 additions & 0 deletions Lib/test/test_pdb.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3816,6 +3816,31 @@ def bar():
self.assertIn('-> pass', lines)
self.assertIn('(Pdb) 42', lines)

def test_issue135700(self):
"""https://github.com/python/cpython/issues/135700"""
module_code = """\
22

class ClassVar:
pass
__dataclass_fields__: ClassVar
"""
with open("testmod.py", "w") as f:
f.write(module_code)
self.addCleanup(os_helper.unlink, "testmod.py")

script = """
import testmod
print(testmod.__annotations__)
"""
commands = """
b testmod.py:1
c
c
"""
result = self.run_pdb_script(script, commands)
self.assertNotIn("(1)__annotate__()", result[0])
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This test passes for me on main (without this PR).

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The problem is the indentation. @AndPuQing indented my code in the strings which (for some unknown reason for me) caused the test to pass. a textwrap.dedent should help.

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@AndPuQing AndPuQing Jul 13, 2025 •
edited
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Yes, I fixed the indent problem, but it seems that the current fix also cannot pass the test.

======================================================================
FAIL: test_issue135700 (test.test_pdb.PdbTestCase.test_issue135700)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/mnt/data/xxx/dev/cpython/Lib/test/test_pdb.py", line 3842, in test_issue135700
    self.assertNotIn("(1)__annotate__()", result[0])
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError: '(1)__annotate__()' unexpectedly found in '> ...
../cpython/python -m dis testmod.py                                                                            (base) 
  --           MAKE_CELL                0 (__conditional_annotations__)

   0           RESUME                   0

   1           LOAD_CONST               2 (<code object __annotate__ at 0x798bd679cd50, file "testmod.py", line 1>)
               MAKE_FUNCTION
               STORE_NAME               2 (__annotate__)
               BUILD_SET                0
               STORE_NAME               0 (__conditional_annotations__)

   3           LOAD_BUILD_CLASS
               PUSH_NULL
               LOAD_CONST               0 (<code object ClassVar at 0x798bd6bb1940, file "testmod.py", line 3>)
               MAKE_FUNCTION
               LOAD_CONST               1 ('ClassVar')
               CALL                     2
               STORE_NAME               1 (ClassVar)

   5           LOAD_NAME                0 (__conditional_annotations__)
               LOAD_SMALL_INT           0
               SET_ADD                  1
               POP_TOP
               LOAD_CONST               3 (None)
               RETURN_VALUE

Disassembly of <code object ClassVar at 0x798bd6bb1940, file "testmod.py", line 3>:
  3           RESUME                   0
              LOAD_NAME                0 (__name__)
              STORE_NAME               1 (__module__)
              LOAD_CONST               0 ('ClassVar')
              STORE_NAME               2 (__qualname__)
              LOAD_SMALL_INT           3
              STORE_NAME               3 (__firstlineno__)

  4           LOAD_CONST               1 (())
              STORE_NAME               4 (__static_attributes__)
              LOAD_CONST               2 (None)
              RETURN_VALUE

Disassembly of <code object __annotate__ at 0x798bd679cd50, file "testmod.py", line 1>:
  1           RESUME                   0
              LOAD_FAST_BORROW         0 (format)
              LOAD_SMALL_INT           2
              COMPARE_OP             132 (>)
              POP_JUMP_IF_FALSE        3 (to L1)
              NOT_TAKEN
              LOAD_COMMON_CONSTANT     1 (NotImplementedError)
              RAISE_VARARGS            1
      L1:     BUILD_MAP                0

  5           LOAD_SMALL_INT           0
              LOAD_GLOBAL              0 (__conditional_annotations__)
              CONTAINS_OP              0 (in)
              POP_JUMP_IF_FALSE       10 (to L2)
              NOT_TAKEN
              LOAD_GLOBAL              2 (ClassVar)
              COPY                     2
              LOAD_CONST               1 ('__dataclass_fields__')

  1           STORE_SUBSCR
      L2:     RETURN_VALUE

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@15r10nk 15r10nk Jul 13, 2025 •
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hmm, @AndPuQing your fix solved the problem which I have reported in the issue (the positions in the bytecode and column information) but not the problem with pdb because the line number of the synthetic code in __annotate__ is still 1. I don't know if there is a way to express an non existing code location (-1 maybe), but this is what would be needed here. Another solution might be to use the location of the first ast-node which is handled by the code (line 5 in this case). This would cause no line change when the code is executed. I thing this might be the most practical solution here.

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Cc @gaogaotiantian

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I feel this is more of a question for experts on tracing (you :D ). From the annotations perspective, the code here isn't directly connected to any code the user wrote; it seems reasonable to me to pretend it's on the first line of the module, or on the first annotation in the module, whatever works better for tools that use the data. But maybe Larry has a stronger opinion.

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Personally I think the best solution here is to set the line number to invalid so it won't trigger a line event at all - there's no corresponding source code for it. Any unexpected side effects for this solution @iritkatriel ?

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What do you mean by invalid? -1? That doesn't mean invalid exactly, it would probably get the line number of the previous instruction.

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Do we have any indicator for "there's no line number for this byte code"? Anything before RESUME seems to have a -- with it. I'm curious whether that's a possible solution - that's the most "correct" solution. If not, we can seek for alternatives.

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We have NO_LOCATION which usually gets replaced by a "previous instruction location", but not always (sometimes it doesn't matter). We don't currently have a way to indicate that an instruction must not have a location. It's not hard to add that, but we need to determine if that's the right thing to do.


def test_step_into_botframe(self):
# gh-125422
# pdb should not be able to step into the botframe (bdb.py)
Expand Down
1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2025-06-22-10-47-27.gh-issue-135700.0qdtCl.rst
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@@ -0,0 +1 @@
Fix instructions positions in :attr:`~object.__annotate__`.
15 changes: 8 additions & 7 deletions Python/codegen.c
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Original file line number Diff line number Diff line change
Expand Up @@ -686,13 +686,14 @@ codegen_setup_annotations_scope(compiler *c, location loc,
PyObject *value_with_fake_globals = PyLong_FromLong(_Py_ANNOTATE_FORMAT_VALUE_WITH_FAKE_GLOBALS);
assert(!SYMTABLE_ENTRY(c)->ste_has_docstring);
_Py_DECLARE_STR(format, ".format");
ADDOP_I(c, loc, LOAD_FAST, 0);
ADDOP_LOAD_CONST(c, loc, value_with_fake_globals);
ADDOP_I(c, loc, COMPARE_OP, (Py_GT << 5) | compare_masks[Py_GT]);

ADDOP_I(c, NO_LOCATION, LOAD_FAST, 0);
ADDOP_LOAD_CONST(c, NO_LOCATION, value_with_fake_globals);
ADDOP_I(c, NO_LOCATION, COMPARE_OP, (Py_GT << 5) | compare_masks[Py_GT]);
NEW_JUMP_TARGET_LABEL(c, body);
ADDOP_JUMP(c, loc, POP_JUMP_IF_FALSE, body);
ADDOP_I(c, loc, LOAD_COMMON_CONSTANT, CONSTANT_NOTIMPLEMENTEDERROR);
ADDOP_I(c, loc, RAISE_VARARGS, 1);
ADDOP_JUMP(c, NO_LOCATION, POP_JUMP_IF_FALSE, body);
ADDOP_I(c, NO_LOCATION, LOAD_COMMON_CONSTANT, CONSTANT_NOTIMPLEMENTEDERROR);
ADDOP_I(c, NO_LOCATION, RAISE_VARARGS, 1);
USE_LABEL(c, body);
return SUCCESS;
}
Expand Down Expand Up @@ -751,7 +752,7 @@ codegen_deferred_annotations_body(compiler *c, location loc,
assert(PyList_CheckExact(conditional_annotation_indices));
assert(annotations_len == PyList_Size(conditional_annotation_indices));

ADDOP_I(c, loc, BUILD_MAP, 0); // stack now contains <annos>
ADDOP_I(c, NO_LOCATION, BUILD_MAP, 0); // stack now contains <annos>

for (Py_ssize_t i = 0; i < annotations_len; i++) {
PyObject *ptr = PyList_GET_ITEM(deferred_anno, i);
Expand Down
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