Bug 143619 – Stop referring to outdated RFC2616 in CacheValidation.cpp

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[Chris Dumez]

Stop referring to outdated RFC2616 in CacheValidation.cpp and refer to the newer RFC7230 & RFC7234.

[Chris Dumez]

Created attachment 250535 [details]
Patch

[Darin Adler]

Comment on attachment 250535 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=250535&action=review

> Source/WebCore/platform/network/CacheValidation.h:51
> +WEBCORE_EXPORT std::chrono::microseconds computeCurrentAge(const ResourceResponse&, const std::chrono::system_clock::time_point& responseTimestamp);
> +WEBCORE_EXPORT std::chrono::microseconds computeFreshnessLifetimeForHTTPFamily(const ResourceResponse&, const std::chrono::system_clock::time_point& responseTimestamp);

Do we really want to change to const time_point&? Anders has pushed me to actually pass objects rather than references for modest-sized structures in the recent past, so maybe that applies here.

[Chris Dumez]

Comment on attachment 250535 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=250535&action=review

>> Source/WebCore/platform/network/CacheValidation.h:51
>> +WEBCORE_EXPORT std::chrono::microseconds computeFreshnessLifetimeForHTTPFamily(const ResourceResponse&, const std::chrono::system_clock::time_point& responseTimestamp);
> 
> Do we really want to change to const time_point&? Anders has pushed me to actually pass objects rather than references for modest-sized structures in the recent past, so maybe that applies here.

I have just verified that std::chrono::system_clock::time_point is only 8 bytes on my machine, so you are likely right. I'll revert this change.

[Chris Dumez]

Created attachment 250574 [details]
Patch

[Chris Dumez]

FYI, I confirmed locally that passing by value here seems slightly faster on my MacBook Pro (lower is better):

size: 8 bytes
by_ref: 348884550
by_value: 341103395 (~2.2% faster)

Benchmark: http://pastebin.com/UNmezmER
// clang++ -std=c++11 -O3 test.cpp

[WebKit Commit Bot]

Comment on attachment 250574 [details]
Patch

Clearing flags on attachment: 250574

Committed r182659: <http://trac.webkit.org/changeset/182659>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.