[Webkit-unassigned] [Bug 118046] New: RuleSet should use malloc rather than Vector

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118046

           Summary: RuleSet should use malloc rather than Vector
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: koivisto at iki.fi, barraclough at apple.com,
                    benjamin at webkit.org, akling at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/5a58b6e748460a8a5e83e8d841e984bed3de1013

The lion's share of the memory used by the style resolver is in the RuleSet
objects. Prior to this CL, these objects were structured as a HashMap from
AtomicStrings to pointers to vectors of RuleData. This CL simplifies this
object graph by removing a layer of indirection. Now we just have a HashMap
from AtomicStrings to an array of RuleDatas.

Rather than use a length to terminate the iteration over the Vector, this CL
uses a bit in RuleData to mark the end of the array. Together with removing the
extra pointer, this CL saves 15 kB on Mobile Gmail.

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