[webkit-changes] [WebKit/WebKit] 2645a1: [JSC] Emit dyld tracepoint to tell system profiler...

[Yusuke Suzuki]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 2645a1e90e1c5a900b1df995cd44e6c29ee06ad6
      https://github.com/WebKit/WebKit/commit/2645a1e90e1c5a900b1df995cd44e6c29ee06ad6
  Author: Yusuke Suzuki <ysuzuki at apple.com>
  Date:   2024-03-21 (Thu, 21 Mar 2024)

  Changed paths:
    M Source/JavaScriptCore/jit/ExecutableAllocator.cpp
    M Source/WTF/wtf/ByteOrder.h
    M Source/WTF/wtf/UUID.cpp
    M Source/WTF/wtf/UUID.h

  Log Message:
  -----------
  [JSC] Emit dyld tracepoint to tell system profiler about JIT code region
https://bugs.webkit.org/show_bug.cgi?id=271419
rdar://125196249

Reviewed by Justin Michaud.

This patch emits fake dyld tracepoint which tells our system profiler (see SystemTracing.h) about JIT code region.
We need to assign good UUID to this JIT code region. And since this is JIT code, each process has different JIT code.
Thus, we create v5 UUID from process ID and namespace UUID and attach it to JIT code region.

* Source/JavaScriptCore/jit/ExecutableAllocator.cpp:
(JSC::initializeJITPageReservation):
* Source/WTF/wtf/ByteOrder.h:
(WTF::bswap64):
* Source/WTF/wtf/UUID.cpp:
(WTF::UUID::createVersion5):
* Source/WTF/wtf/UUID.h:

Canonical link: https://commits.webkit.org/276524@main



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