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8da2c377da
This adjusts the IRGen layer to accommodate the Windows linking model. We assume dynamic linking by default. The static linking is enabled by passing `-static` to the driver, which forwards it to the frontend when building the module statically. This has already been required when generating libraries, however, the non-Windows targets are more forgiving and let it work. On those platforms, using this hint would allow for more efficient code generation, reducing load times and some runtime penalties from the PLT and GOT references formed to symbols which are module local. This corrects static linking on Windows, which is one of the last few items that are missing on Windows. It also takes advantage of the hint for the one peculiar difference between Windows and non-Windows: protocol conformances that span module boundaries are not available as a constant. However, when statically linking, we can enable those conformances to be statically resolved. This should enable the last known pattern to work when using static linking. This support requires further work in the Swift Package Manager to actually enable building libraries properly. However, when building with CMake, this should be sufficient to enable static linking.
66 lines
2.0 KiB
Swift
66 lines
2.0 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend -target x86_64-unknown-windows-msvc -parse-as-library -parse-stdlib -static -emit-module -emit-module-path %t/module.swiftmodule -module-name module -DMODULE %s
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// RUN: %target-swift-frontend -target x86_64-unknown-windows-msvc -parse-as-library -parse-stdlib -S -emit-ir %s -module-name main -o - -I%t | %FileCheck %s -check-prefix CHECK-STATIC
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// RUN: %target-swift-frontend -target x86_64-unknown-windows-msvc -parse-as-library -parse-stdlib -emit-module -emit-module-path %t/module.swiftmodule -module-name module -DMODULE %s
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// RUN: %target-swift-frontend -target x86_64-unknown-windows-msvc -parse-as-library -parse-stdlib -S -emit-ir %s -module-name main -o - -I%t | %FileCheck %s -check-prefix CHECK-SHARED
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#if MODULE
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public struct S {}
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public var value: S {
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S()
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}
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public func f(_ s: S) {}
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public protocol P {
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}
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public enum E: P {
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}
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#else
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import module
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protocol Q: P {
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}
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extension E: Q {
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}
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@main
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struct Entry {
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public static func main() {
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f(value)
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}
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}
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#endif
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// Ensure that static linking does not mark the entries as being indirected
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// through the IAT.
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// CHECK-STATIC: @"$s6module1EO4main1QADWP" = hidden constant [2 x i8*] [
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// CHECK-STATIC-SAME: i8* bitcast (%swift.protocol_conformance_descriptor* @"$s6module1EO4main1QADMc" to i8*),
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// CHECK-STATIC-SAME: i8* bitcast (i8** @"$s6module1EOAA1PAAWP" to i8*)
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// CHECK-STATIC-SAME: ]
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// CHECK-STATIC: declare swiftcc void @"$s6module5valueAA1SVvg"()
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// CHECK-STATIC: declare swiftcc void @"$s6module1fyyAA1SVF"()
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// Ensure that shared linking does mark the functions as being indirected
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// through the IAT.
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// CHECK-SHARED: @"$s6module1EO4main1QADWP" = hidden constant [2 x i8*] [
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// CHECK-SHARED-SAME: i8* bitcast (%swift.protocol_conformance_descriptor* @"$s6module1EO4main1QADMc" to i8*),
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// CHECK-SHARED-SAME: i8* null
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// CHECK-SHARED-SAME: ]
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// CHECK-SHARED: declare dllimport swiftcc void @"$s6module5valueAA1SVvg"()
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// CHECK-SHARED: declare dllimport swiftcc void @"$s6module1fyyAA1SVF"()
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