Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 558c956f7912931a5b81df741b72d4e3961bf406
https://github.com/WebKit/WebKit/commit/558c956f7912931a5b81df741b72d4e3961bf406
Author: Ahmad Saleem <[email protected]>
Date: 2026-10-06 (Tue, 06 Oct 2026)
Changed paths:
M Source/WebCore/dom/DataTransfer.cpp
M Source/WebCore/dom/DataTransfer.h
Log Message:
-----------
Reduce padding in DataTransfer
https://bugs.webkit.org/show_bug.cgi?id=326538
rdar://189329011
Reviewed by Charlie Wolfe.
Reorder DataTransfer's data members to remove padding holes left by the
4-byte enums, the bool and the IntPoint sitting between 8-byte members.
m_storeMode now fills the 4 bytes left free after the
RefCountedAndCanMakeWeakPtr base (Itanium ABI), and the small members
of the DRAG_SUPPORT block (m_dragLocation, m_type,
m_shouldUpdateDragImage) are grouped after its pointer-sized members.
sizeof(DataTransfer) on 64-bit release builds:
Apple arm64/x86_64, Linux (Clang/GCC): 120 -> 104 bytes
Windows x64/ARM64 (MSVC ABI): 120 -> 112 bytes
32-bit targets: unchanged
The destruction order of members with non-trivial destructors is
unchanged; only trivially destructible members moved relative to them.
No behavior change, so no new tests.
* Source/WebCore/dom/DataTransfer.cpp:
(WebCore::DataTransfer::DataTransfer):
* Source/WebCore/dom/DataTransfer.h:
Canonical link: https://commits.webkit.org/322908@main
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