some instructions in __annotate__ have incorrect code positions

[15r10nk]

Bug report

Bug description:

The following code shows the incorrect positions:

from dis import Bytecode

src = """\
22
333
__dataclass_fields__: ClassVar
"""

code = compile(src, "<string>", "exec")
print(code.co_consts)
annotate_code = code.co_consts[1]

for bc in Bytecode(annotate_code):
    print(bc.positions, bc.opname)

output (Python 3.14.0b3+):

(0, <code object __annotate__ at 0x7fcda674f940, file "<string>", line 1>, None)
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=0) RESUME       
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) LOAD_FAST_BORROW         # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) LOAD_SMALL_INT           # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) COMPARE_OP               # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) POP_JUMP_IF_FALSE        # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) NOT_TAKEN                # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) LOAD_COMMON_CONSTANT     # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) RAISE_VARARGS            # incorrect
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) BUILD_MAP                # incorrect
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) LOAD_SMALL_INT
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) LOAD_GLOBAL
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) CONTAINS_OP
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) POP_JUMP_IF_FALSE
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) NOT_TAKEN
Positions(lineno=3, end_lineno=3, col_offset=22, end_col_offset=30) LOAD_GLOBAL
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) COPY
Positions(lineno=3, end_lineno=3, col_offset=0, end_col_offset=30) LOAD_CONST
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) STORE_SUBSCR
Positions(lineno=1, end_lineno=1, col_offset=0, end_col_offset=2) RETURN_VALUE

The statements after RESUME have the position of the first ast-node in the module. I think it would be correct if they had the same code position as RESUME. I assume they are part of a general code that is part of every __annotate__ and are not associated with a specific ast-node.

I hope this can be fixed, as it makes it difficult for projects like executing to work with these code locations.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

[JelleZijlstra]

I'm open to changing this, are you interested in sending a PR?

[15r10nk]

Our family vacation starts tomorrow, so I don't really have time, otherwise I'd love to.