[Webkit-unassigned] [Bug 86435] New: CodeBlock::CodeBlock() wastes a lot of Vector capacity

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=86435

           Summary: CodeBlock::CodeBlock() 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 Vector allocated here:


1996 vectors, 134.75KB used of 998.00KB, 863.25KB wasted at:
1   0x1069acb15 WTF::Vector<JSC::ValueProfile, 0ul>::Vector()
2   0x10699c7c5 WTF::Vector<JSC::ValueProfile, 0ul>::Vector()
3   0x106995898 JSC::CodeBlock::CodeBlock(JSC::ScriptExecutable*, JSC::CodeType, JSC::JSGlobalObject*, WTF::PassRefPtr<JSC::SourceProvider>, unsigned int, WTF::HashMap<WTF::RefPtr<WTF::StringImpl>, JSC::SymbolTableEntry, JSC::IdentifierRepHash, WTF::HashTraits<WTF::RefPtr<WTF::StringImpl> >, JSC::SymbolTableIndexHashTraits>*, bool, WTF::PassOwnPtr<JSC::CodeBlock>)
4   0x106a9ea22 JSC::FunctionCodeBlock::FunctionCodeBlock(JSC::FunctionExecutable*, JSC::CodeType, JSC::JSGlobalObject*, WTF::PassRefPtr<JSC::SourceProvider>, unsigned int, bool, WTF::PassOwnPtr<JSC::CodeBlock>)
5   0x106a97ab8 JSC::FunctionCodeBlock::FunctionCodeBlock(JSC::FunctionExecutable*, JSC::CodeType, JSC::JSGlobalObject*, WTF::PassRefPtr<JSC::SourceProvider>, unsigned int, bool, WTF::PassOwnPtr<JSC::CodeBlock>)

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