Bug 119847 – [Windows] Incorrect DLL Linkage for JavaScriptCore ArrayBuffer and ArrayBufferView

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Brent Fulgham]

I noticed the following warnings in my build output:

7>..\runtime\ArrayBuffer.cpp(37): warning C4273: 'JSC::ArrayBuffer::transfer' : inconsistent dll linkage
7>          c:\projects\webkit\opensource\source\javascriptcore\runtime\ArrayBuffer.h(109) : see previous definition of 'transfer'
7>..\runtime\ArrayBufferView.cpp(34): warning C4273: 'JSC::ArrayBufferView::ArrayBufferView' : inconsistent dll linkage
7>          c:\projects\webkit\opensource\source\javascriptcore\runtime\ArrayBufferView.h(78) : see previous definition of '{ctor}'
7>..\runtime\ArrayBufferView.cpp(46): warning C4273: 'JSC::ArrayBufferView::~ArrayBufferView' : inconsistent dll linkage
7>          c:\projects\webkit\opensource\source\javascriptcore\runtime\ArrayBufferView.h(75) : see previous definition of '{dtor}'
7>..\runtime\ArrayBufferView.cpp(52): warning C4273: 'JSC::ArrayBufferView::neuter' : inconsistent dll linkage
7>          c:\projects\webkit\opensource\source\javascriptcore\runtime\ArrayBufferView.h(122) : see previous definition of 'neuter'

These are caused by the use of a WTF export macro when building JSC:

From JavaScriptCore/runtime/ArrayBuffer.h:
    WTF_EXPORT_PRIVATE bool transfer(ArrayBufferContents&, Vector<RefPtr<ArrayBufferView> >& neuteredViews);

From JavaScriptCore/runtime/ArrayBufferView.h:
    WTF_EXPORT_PRIVATE virtual ~ArrayBufferView();
    WTF_EXPORT_PRIVATE ArrayBufferView(PassRefPtr<ArrayBuffer>, unsigned byteOffset);
    WTF_EXPORT_PRIVATE virtual void neuter();

Unless you have WTF_IS_LINKED_IN_SAME_BINARY defined (which is only true when building the WTF.dll), WTF_EXPORT_PRIVATE is mapped to __declspec(dllimport).

This means the linker will try to find these definitions in an external library.  This should result in a compile failure, but I guess Visual Studio sees the definition in the implementation file and uses it.

[Radar WebKit Bug Importer]

<rdar://problem/14747056>

[Brent Fulgham]

Created attachment 208817 [details]
Patch

[Mark Lam]

Comment on attachment 208817 [details]
Patch

LGTM, but need someone else to r+.

[Brent Fulgham]

Committed r154119: <http://trac.webkit.org/changeset/154119>