[Webkit-unassigned] [Bug 86437] New: CodeBlock::RareData() wastes a lot of vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86437

           Summary: CodeBlock::RareData() wastes a lot of vector capacity
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: simon.fraser at apple.com
                CC: ggaren at apple.com, oliver at apple.com,
                    barraclough at apple.com, msaboff at apple.com,
                    fpizlo at apple.com


Data collected via bug 86281 show that a lot of vector capacity is wasted via the Vectors allocated here:

2232 vectors, 0.31KB used of 558.00KB, 557.69KB wasted at:
1   0x106979f55 WTF::Vector<JSC::InlineCallFrame, 4ul>::Vector()
2   0x106979625 WTF::Vector<JSC::InlineCallFrame, 4ul>::Vector()
3   0x1069795c4 WTF::SegmentedVector<JSC::InlineCallFrame, 4ul>::SegmentedVector()
4   0x106979465 WTF::SegmentedVector<JSC::InlineCallFrame, 4ul>::SegmentedVector()
5   0x106979319 JSC::CodeBlock::RareData::RareData()

2232 vectors, 17.44KB used of 558.00KB, 540.56KB wasted at:
1   0x106979e45 WTF::Vector<WTF::Vector<JSC::InlineCallFrame, 4ul>*, 32ul>::Vector()
2   0x106979645 WTF::Vector<WTF::Vector<JSC::InlineCallFrame, 4ul>*, 32ul>::Vector()
3   0x1069795d6 WTF::SegmentedVector<JSC::InlineCallFrame, 4ul>::SegmentedVector()
4   0x106979465 WTF::SegmentedVector<JSC::InlineCallFrame, 4ul>::SegmentedVector()
5   0x106979319 JSC::CodeBlock::RareData::RareData()

2232 vectors, 66.41KB used of 310.97KB, 244.56KB wasted at:
1   0x10697a185 WTF::Vector<JSC::LineInfo, 0ul>::Vector()
2   0x106979425 WTF::Vector<JSC::LineInfo, 0ul>::Vector()
3   0x1069792f9 JSC::CodeBlock::RareData::RareData()
4   0x106975bd5 JSC::CodeBlock::RareData::RareData()
5   0x106974214 JSC::CodeBlock::createRareDataIfNecessary()

2232 vectors, 486.60KB used of 692.79KB, 206.19KB wasted at:
1   0x10697a285 WTF::Vector<JSC::ExpressionRangeInfo, 0ul>::Vector()
2   0x106979405 WTF::Vector<JSC::ExpressionRangeInfo, 0ul>::Vector()
3   0x1069792e9 JSC::CodeBlock::RareData::RareData()
4   0x106975bd5 JSC::CodeBlock::RareData::RareData()
5   0x106974214 JSC::CodeBlock::createRareDataIfNecessary()

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