[Webkit-unassigned] [Bug 187455] Can we make WebCore::Timer more space-efficient?

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=187455

--- Comment #1 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
Here's the full layout:

 4$ $ ./Tools/Scripts/dump-class-layout -c Release WebCore Timer
  +0 < 72> Timer
  +0 < 64>     WebCore::TimerBase WebCore::TimerBase
  +0 <  8>        __vtbl_ptr_type * _vptr
  +8 <  8>         WTF::MonotonicTime m_nextFireTime
  +8 <  8>           double m_value
 +16 <  8>         WTF::MonotonicTime m_unalignedNextFireTime
 +16 <  8>           double m_value
 +24 <  8>         WTF::Seconds m_repeatInterval
 +24 <  8>           double m_value
 +32 <  4>       int m_heapIndex
 +36 <  4>       unsigned int m_heapInsertionOrder
 +40 <  1>       bool m_wasDeleted
 +41 <  7>       <PADDING: 7 bytes>
 +48 <  8>       WTF::Vector<WebCore::TimerBase *, 0, WTF::CrashOnOverflow, 16> * m_cachedThreadGlobalTimerHeap
 +56 <  8>         WTF::Ref<WTF::Thread, WTF::DumbPtrTraits<WTF::Thread> > m_thread
 +56 <  8>           WTF::DumbPtrTraits<WTF::Thread>::StorageType m_ptr
 +64 <  8>     WTF::Function<void ()> m_function
 +64 <  8>         std::__1::unique_ptr<WTF::Function<void ()>::CallableWrapperBase, std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase> > m_callableWrapper
 +64 <  8>             std::__1::__compressed_pair<WTF::Function<void ()>::CallableWrapperBase *, std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase> > __ptr_
 +64 <  8>                 std::__1::__compressed_pair_elem<WTF::Function<void ()>::CallableWrapperBase *, 0, false> std::__1::__compressed_pair_elem<WTF::Function<void ()>::CallableWrapperBase *, 0, false>
 +64 <  8>                   WTF::Function<void ()>::CallableWrapperBase * __value_
 +64 <  1>                 std::__1::__compressed_pair_elem<std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase>, 1, true> std::__1::__compressed_pair_elem<std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase>, 1, true>
 +64 <  1>                     std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase> std::__1::default_delete<WTF::Function<void ()>::CallableWrapperBase>
Total byte size: 72
Total pad bytes: 7
Padding percentage: 9.72 %

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