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5b642f548f
Allow external declaration of global variables via `@_extern(c)`. Such variables need to have types represented in C (of course), have only storage (no accessors), and cannot have initializers. At the SIL level, we use the SIL asmname attribute to get the appropriate C name. While here, slightly shore up the `@_extern(c)` checking, which should fix issue #70776 / rdar://153515764.
43 lines
1.2 KiB
Swift
43 lines
1.2 KiB
Swift
// RUN: %target-swift-frontend -emit-ir -enable-experimental-feature Extern %s | %FileCheck %s
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// REQUIRES: swift_feature_Extern
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// CHECK: @pointer_c = external global
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@_extern(c)
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var pointer_c: UnsafeMutablePointer<Int>
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// CHECK: @nullable_pointer_c = external global
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@_extern(c)
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var nullable_pointer_c: UnsafeMutablePointer<Int>?
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func acceptInt(_: Int) { }
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func test() {
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// CHECK: call void @explicit_extern_c()
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explicit_extern_c()
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// CHECK: call void @implicit_extern_c()
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implicit_extern_c()
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// CHECK: [[DEFAULT_ARG:%[0-9]+]] = call swiftcc i32 @"$s8extern_c17default_arg_valueyys5Int32VFfA_"()
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// CHECK: call void @default_arg_value(i32 [[DEFAULT_ARG]])
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default_arg_value()
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// CHECK: call void @default_arg_value(i32 24)
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default_arg_value(24)
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// CHECK: call void @swift_beginAccess(ptr @pointer_c
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// CHECK-NEXT: [[POINTEE_VAL:%[0-9]+]] = load ptr, ptr @pointer_c
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// CHECK-NEXT: call void @swift_endAccess
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acceptInt(pointer_c.pointee)
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}
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test()
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// CHECK: declare void @explicit_extern_c()
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@_extern(c, "explicit_extern_c") func explicit_extern_c()
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// CHECK: declare void @implicit_extern_c()
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@_extern(c) func implicit_extern_c()
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// CHECK: declare void @default_arg_value(i32)
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@_extern(c) func default_arg_value(_: Int32 = 42)
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