[6.2][cxx-interop] Work around crash in codegen when initializing C++ span #81047
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… span Explanation: C++ templates are imported as Swift generics. Unfortunately, the codegen for some of the instantiations will crash codegen due to a confusion in how Swift pointer types are mapped back to their native counterparts. As a result, when a user is passing an UnsafePointer<Element>? to a C++ span constructor we got a crash. The user should never need the generic version of the initializer as we already have an initializer taking an UnsafePointer<Element> in the C++ overlay. This PR avoids importing the templated span constructors to work around this issue. Issue: rdar://148961349 Risk: Low, the fix is very targeted. Testing: Regression test added. Original PR: #81030 Reviewer: @j-hui
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@swift-ci please test |
j-hui
approved these changes
Apr 23, 2025
Xazax-hun
changed the title
DougGregor
approved these changes
Apr 23, 2025
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Explanation: C++ templates are imported as Swift generics. Unfortunately, the codegen for some of the instantiations will crash codegen due to a confusion in how Swift pointer types are mapped back to their native counterparts. As a result, when a user is passing an UnsafePointer? to a C++ span constructor we got a crash. The user should never need the generic version of the initializer as we already have an initializer taking an UnsafePointer in the C++ overlay. This PR avoids importing the templated span constructors to work around this issue.
Issue: rdar://148961349
Risk: Low, the fix is very targeted.
Testing: Regression test added.
Original PR: #81030
Reviewer: @j-hui