Author pitrou
Recipients Ramchandra Apte, alanh, christian.heimes, ezio.melotti, jcea, pitrou, serhiy.storchaka, skrah, trent
Date 2013-02-19.21:02:21
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In-reply-to <>
> It must be about pointer alignment, because that's the whole point of
> the ASSERT.

Indeed, it's about pointer alignment, but it's not about the CPU. It's
about the compiler (or the platform's C ABI).

Apparently the compiler doesn't align struct fields to natural
boundaries like most other compilers do, which means the size of the
PyASCIIObject struct (in unicodeobject.h) ends up not being a multiple
of 4, which in turn means the "dest" pointer (allocated from the end of
that structure) is not 4 byte-aligned either.

However, you can probably safely remove the assert(), since it is there
to warn about misalignment on platforms which *are* alignment-sensitive.
There is another assert() of the same kind in unicodeobject.c, which you
can remove too.

It would be nice if the C source could be improved here, but it's not
obvious which rule to enforce exactly. We want to be lenient if the
misalignment is a product of the compiler's alignment rules, but not if
it's a mistake on our part.

Which compiler is it?
Date User Action Args
2013-02-19 21:02:21pitrousetrecipients: + pitrou, jcea, christian.heimes, trent, ezio.melotti, alanh, skrah, Ramchandra Apte, serhiy.storchaka
2013-02-19 21:02:21pitroulinkissue17237 messages
2013-02-19 21:02:21pitroucreate