On Fri, May 21, 2021 at 2:48 PM Guido van Rossum <gu...@python.org> wrote:
> I suspect that you're running into the issue where compiler optimizations
> are *forced* on for ceval.c.
>
> There's a comment near the top about this. Just comment out this line:
>
> #define PY_LOCAL_AGGRESSIVE
>
> We tried to define that macro conditionally, but something broke because
> the C stack frame for _PyEval_EvalFrameDefault became enormous without
> optimization, and some tests failed. (Maybe it was Victor's refleak test?
> The git history will tell you more if you're really interested.)
>
> This is a nasty trap (I fell in myself, so that makes it nasty :-), but
> the proper fix would be convoluted -- we'd need a way to enable or disable
> this separately so the specific test can run but developers trying to step
> through ceval.c will be able to see the unoptimized code.
>
Thanks, Guido, however that doesn't seem to help. I grepped around for
PY_LOCAL_AGGRESSIVE in the source. It seems to be specific to MSVC. Here's
the definition in Include/pyport.h with a slight change to the indentation
to demonstrate its scope better:
#if defined(_MSC_VER)
# if defined(PY_LOCAL_AGGRESSIVE)
/* enable more aggressive optimization for MSVC */
/* active in both release and debug builds - see bpo-43271 */
# pragma optimize("gt", on)
# endif
/* ignore warnings if the compiler decides not to inline a function */
# pragma warning(disable: 4710)
/* fastest possible local call under MSVC */
# define Py_LOCAL(type) static type __fastcall
# define Py_LOCAL_INLINE(type) static __inline type __fastcall
#else
# define Py_LOCAL(type) static type
# define Py_LOCAL_INLINE(type) static inline type
#endif
I can move the actual point where GDB breaks by replacing -Og with -O0, but
it still breaks at the wrong place, just a different wrong place. If I set
a breakpoint by line number, it stops at the proper place.
Skip
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