ah... we may have been talking past each other.
Steve Dower wrote:
> On 25Jul2020 2014, Jim J. Jewett wrote:
> > But it sounds as though you are saying the benefit
[of storing the line numbers in an external table, I thought,
but perhaps Pablo Galindo Salgado and yourself were
talking only of the switch from an lnotab string to an opaque
co_linetable?]
> > is irrelevant; it is just inherently too expensive to ask programs that are
> > already dealing
> > with internals and trying to optimize performance to make a mechanical
> > change from:
> > code.magic_attrname
> > to:
> > magicdict[code]
> > What have I missed?
> You've missed that debugging and profiling tools that operate purely on
> native memory can't execute Python code, so the "magic" has to be easily
> representable in C such that it can be copied into whichever language is
> being used (whether it's C, C++, C#, Rust, or something else).
Unless you really were talking only of the switch to co_linetable, I'm still
missing the problem. To me, it still looks like a call to:
PyAPI_FUNC(PyObject *) PyObject_GetAttrString(PyObject *, const char *);
with the code object being stepped through and "co_lnotab"
would be replaced by:
PyAPI_FUNC(PyObject *) PyDict_GetItem(PyObject *mp, PyObject *key);
using that same code object as the key, but getting the dict from
some well-known (yet-to-be-defined) location, such as sys.code_to_lnotab.
Mark Shannon and Carl Shapiro had seemed to object to the PEP because
the new structure would make the code object longer, and making it smaller
by a string does seem likely to be good. But if your real objections are to
just to replacing the lnotab format with something that needs to be
executed, then I apologize for misunderstanding.
-jJ
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