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Foundation: adjust initialization codepath for Windows #2571

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Nov 22, 2019
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Foundation: adjust initialization codepath for Windows #2571

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7 changes: 7 additions & 0 deletions Foundation/NSSwiftRuntime.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -154,6 +154,13 @@ internal func __CFInitializeSwift() {
__CFSocketInitializeWinSock()
#endif

// Ensure that the foreign type value witness for `_NSCFConstantString` is
// initialized prior to access. This may be lazily initialized on some
// targets when the type cache is updated due to a type-cast.
//
// TODO: invoke `swift_getForeignTypeMetadata` to do this directly
if let _ = "" as? _NSCFConstantString {}

_CFRuntimeBridgeTypeToClass(CFStringGetTypeID(), unsafeBitCast(_NSCFString.self, to: UnsafeRawPointer.self))
_CFRuntimeBridgeTypeToClass(CFArrayGetTypeID(), unsafeBitCast(_NSCFArray.self, to: UnsafeRawPointer.self))
_CFRuntimeBridgeTypeToClass(CFDictionaryGetTypeID(), unsafeBitCast(_NSCFDictionary.self, to: UnsafeRawPointer.self))
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