Bug 278625 – Ignore -Wthread-safety-reference-return warnings in WebCore with upstream clang

• Component: WebCore Misc.
• Status: RESOLVED FIXED

[David Kilzer (:ddkilzer)]

Fix -Wthread-safety-reference-return warnings in WebCore with upstream clang.

Example warnings:


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource285.cpp:8:
In file included from Source/WebCore/page/ShadowRealmGlobalScope.cpp:27:
In file included from Source/WebCore/page/ShadowRealmGlobalScope.h:28:
In file included from Source/WebCore/bindings/js/JSShadowRealmGlobalScopeBase.h:28:
Source/WebCore/bindings/js/JSDOMGlobalObjectInlines.h:43:12: error: returning variable 'm_structures' by reference requires holding lock 'm_gcLock' exclusively [-Werror,-Wthread-safety-reference-return]
   43 |     return m_structures;
      |            ^
Source/WebCore/bindings/js/JSDOMGlobalObjectInlines.h:49:12: error: returning variable 'm_guardedObjects' by reference requires holding lock 'm_gcLock' exclusively [-Werror,-Wthread-safety-reference-return]
   49 |     return m_guardedObjects;
      |            ^
2 errors generated.


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource450.cpp:2:
In file included from Source/WebCore/workers/shared/SharedWorkerGlobalScope.cpp:31:
Source/WebCore/dom/MessageEvent.h:78:43: error: returning variable 'm_data' by reference requires holding lock 'm_concurrentDataAccessLock' [-Werror,-Wthread-safety-reference-return]
   78 |     const DataType& data() const { return m_data; }
      |                                           ^
1 error generated.


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource179.cpp:1:
In file included from Source/WebCore/dom/TrustedTypePolicy.cpp:27:
Source/WebCore/dom/TrustedTypePolicy.h:60:62: error: returning variable 'm_options' by reference requires holding lock 'm_lock' [-Werror,-Wthread-safety-reference-return]
   60 |     const TrustedTypePolicyOptions& options() const { return m_options; }
      |                                                              ^
1 error generated.


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource261.cpp:2:
Source/WebCore/loader/MediaResourceLoader.cpp:174:12: error: returning variable 'm_crossOriginMode' by reference requires holding is current 'mainThread' [-Werror,-Wthread-safety-reference-return]
  174 |     return m_crossOriginMode;
      |            ^
1 error generated.


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource331.cpp:2:
Source/WebCore/platform/graphics/MediaSourcePrivate.cpp:265:12: error: returning variable 'm_liveSeekable' by reference requires holding lock 'm_lock' [-Werror,-Wthread-safety-reference-return]
  265 |     return m_liveSeekable;
      |            ^
1 error generated.


In file included from WebKitBuild/Release/DerivedSources/WebCore/unified-sources/UnifiedSource50-mm.mm:3:
Source/WebCore/platform/network/cocoa/RangeResponseGenerator.mm:101:12: error: returning variable 'm_map' by reference requires holding mutex 'm_targetDispatcher' exclusively [-Werror,-Wthread-safety-reference-return]
  101 |     return m_map;
      |            ^
1 error generated.

[Radar WebKit Bug Importer]

<rdar://problem/134653057>

[David Kilzer (:ddkilzer)]

Pull request: https://github.com/WebKit/WebKit/pull/32685

[David Kilzer (:ddkilzer)]

Committed 282816@main (1baa85f): https://commits.webkit.org/282816@main

Reviewed commits have been landed. Closing PR #32685 and removing active labels.