Issue 14746: Remove redundant paragraphs from getargs.c skipitem() (original) (raw)

Created on 2012-05-07 23:24 by larry, last changed 2022-04-11 14:57 by admin. This issue is now closed.

Files
File name Uploaded Description Edit
larry.prune.skipitem.1.diff larry,2012-05-09 06:36 review
Messages (6)
msg160179 - (view) Author: Larry Hastings (larry) * (Python committer) Date: 2012-05-07 23:24
There's code like this in skipitem() in Python/getargs.c: case 'b': /* byte -- very short int */ /* ... a zillion more case statements here ... */ case 'C': /* unicode char */ case 'p': /* boolean predicate */ { (void) va_arg(*p_va, void *); break; } case 'n': /* Py_ssize_t */ { (void) va_arg(*p_va, Py_ssize_t *); break; } /* ... a bunch of other stuff here ... */ case 'S': /* string object */ case 'Y': /* string object */ case 'U': /* unicode string object */ { (void) va_arg(*p_va, PyObject **); break; } I cannot for the life of me imagine a platform where the size of a "Py_ssize_t *" or a "PyObject **" would be different from the size of a "void *". I've programmed on platforms where code pointers and data pointers were different sizes--but data pointers to different sizes of data? Never heard of it. But I've been wrong before! So, rather than simply make the change, I'm posting this bug just as a double check. It's safe to fold 'n', 'S', 'Y', and 'U' into the initial paragraph of case statements simply skipping a pointer... isn't it?
msg160247 - (view) Author: Antoine Pitrou (pitrou) * (Python committer) Date: 2012-05-09 06:29
I'm not sure what you're proposing to fix. It seems to save at most a couple of lines of (obvious) code? At least Py_ssize_t *could* have a different width from "PyObject *".
msg160248 - (view) Author: Larry Hastings (larry) * (Python committer) Date: 2012-05-09 06:36
> I'm not sure what you're proposing to fix. It seems to save at > most a couple of lines of (obvious) code? Well, I *did* specify low priority. Attached is the patch for what I had in mind. > At least Py_ssize_t *could* have a different width from "PyObject *". Not "Py_ssize_t", "Py_ssize_t *".
msg160249 - (view) Author: Antoine Pitrou (pitrou) * (Python committer) Date: 2012-05-09 06:44
> > At least Py_ssize_t *could* have a different width from "PyObject *". > > Not "Py_ssize_t", "Py_ssize_t *". Ah, fair enough then. Looks ok to me.
msg160250 - (view) Author: Roundup Robot (python-dev) (Python triager) Date: 2012-05-09 06:52
New changeset 8ab37fa24e58 by Larry Hastings in branch 'default': Issue #14746: Remove redundant paragraphs from skipitem() in Python/getargs.c. http://hg.python.org/cpython/rev/8ab37fa24e58
msg160251 - (view) Author: Larry Hastings (larry) * (Python committer) Date: 2012-05-09 06:53
Thanks for the double-check. I should have more confidence!
History
Date User Action Args
2022-04-11 14:57:30 admin set github: 58951
2012-05-09 06:53:15 larry set status: open -> closedresolution: fixedmessages: + stage: needs patch -> resolved
2012-05-09 06:52:26 python-dev set nosy: + python-devmessages: +
2012-05-09 06:44:42 pitrou set messages: +
2012-05-09 06:36:30 larry set files: + larry.prune.skipitem.1.diffkeywords: + patchmessages: +
2012-05-09 06:29:22 pitrou set nosy: + mark.dickinson, pitroumessages: +
2012-05-07 23:24:51 larry create