Message 252599 - Python tracker

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In-reply-to
Author	vstinner
Recipients	serhiy.storchaka, vstinner
Date	2015年10月09日.12:13:41
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1444392822.73.0.0714587534509.issue25353@psf.upfronthosting.co.za>

Content
Attached patch modifies unicode escape and raw unicode escape encoders to use the new _PyBytesWriter API. The patch is optimized to encode Latin1 characters: encoding Latin1 characters when no character is escaped should not have to call _PyByte_Resize() at all. When characters are escaped or a BMP or non-BMP string is encoded, overallocation is used to reduce the number of _PyByte_Resize(). It uses _PyBytesWriter overallocation strategy instead of always overallocate for the worst case. _PyBytesWriter also embeds a small buffer allocated on the stack which also avoids calls to _PyBytes_Resize() when the output fits into 512 bytes.

Content

Attached patch modifies unicode escape and raw unicode escape encoders to use the new _PyBytesWriter API.
The patch is optimized to encode Latin1 characters: encoding Latin1 characters when no character is escaped should not have to call _PyByte_Resize() at all.
When characters are escaped or a BMP or non-BMP string is encoded, overallocation is used to reduce the number of _PyByte_Resize(). It uses _PyBytesWriter overallocation strategy instead of always overallocate for the worst case.
_PyBytesWriter also embeds a small buffer allocated on the stack which also avoids calls to _PyBytes_Resize() when the output fits into 512 bytes.

History
Date	User	Action	Args
2015年10月09日 12:13:42	vstinner	set	recipients: + vstinner, serhiy.storchaka
2015年10月09日 12:13:42	vstinner	set	messageid: <1444392822.73.0.0714587534509.issue25353@psf.upfronthosting.co.za>
2015年10月09日 12:13:42	vstinner	link	issue25353 messages
2015年10月09日 12:13:42	vstinner	create

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