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When importing a C++ class template instantiation, Swift translates the template parameter type names from C++ into their Swift equivalent. For instance, `basic_string<wchar_t, char_traits<wchar_t>, allocator<wchar_t>>` gets imported as `basic_string<Scalar, char_traits<Scalar>, allocator<Scalar>>`: `wchar_t` is imported as `CWideChar`, which is a typealias for `Scalar` on most platforms including Darwin. Notice that Swift goes through the `CWideChar` typealias on the specific platform. Another instantiation `basic_string<uint32_t, char_traits<uint32_t>, allocator<uint32_t>>` also gets imported as `basic_string<Scalar, char_traits<Scalar>, allocator<Scalar>>`: `uint32_t` is also imported as `Scalar`. This is problematic because we have two distinct C++ types that have the same name in Swift. This change makes sure Swift doesn't go through typealiases when emitting names of template parameters, so `wchar_t` would now get printed as `CWideChar`, `int` would get printed as `CInt`, etc. This also encourages clients to use the correct type (`CInt`, `CWideChar`, etc) instead of relying on platform-specific typealiases. rdar://115673622
14 lines
515 B
Swift
14 lines
515 B
Swift
// RUN: %target-swift-frontend -I %S/Inputs -cxx-interoperability-mode=swift-5.9 -emit-ir %s -Xcc -fignore-exceptions | %FileCheck %s
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// REQUIRES: objc_interop
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import Foundation
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import CxxStdlib
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// CHECK: @"\01L_selector(UTF8String)"
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// CHECK: @objc_msgSend
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// CHECK: call swiftcc void @"$sSo3stdO3__1O0071basic_stringCCharchar_traitsCCharallocatorCChar_mHGHsqaGJcraCCfsaqChraaV9CxxStdlibEyAFSPys4Int8VGSgcfC"
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let ObjCStr: NSString = "hello"
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let CxxStr = std.string(ObjCStr.utf8String) // Should not crash here
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