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69e4b95fb8
Although nonescaping closures are representationally trivial pointers to their on-stack context, it is useful to model them as borrowing their captures, which allows for checking correct use of move-only values across the closure, and lets us model the lifetime dependence between a closure and its captures without an ad-hoc web of `mark_dependence` instructions. During ownership elimination, We eliminate copy/destroy_value instructions and end the partial_apply's lifetime with an explicit dealloc_stack as before, for compatibility with existing IRGen and non-OSSA aware passes.
28 lines
1.4 KiB
Swift
28 lines
1.4 KiB
Swift
// RUN: %target-swift-emit-silgen -emit-silgen %s | %FileCheck %s
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infix operator ~>
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protocol P { }
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func bar<T:P>(_: inout T) -> (()) -> () { return {_ in ()} }
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func baz<T:P>(_: inout T) -> (Int) -> () { return {_ in ()} }
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func ~> <T: P, Args, Result>(
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x: inout T,
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m: (_ x: inout T) -> ((Args) -> Result)
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) -> ((Args) -> Result) {
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return m(&x)
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}
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struct X : P {}
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var a = X()
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(a~>bar)(())
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// CHECK: [[CHAINED_FUNC:%.*]] = apply {{%.*}}<X, (), ()>({{%.*}}, {{%.*}}) : $@convention(thin) <τ_0_0, τ_0_1, τ_0_2 where τ_0_0 : P> (@inout τ_0_0, @guaranteed @noescape @callee_guaranteed @substituted <τ_0_0, τ_0_1, τ_0_2> (@inout τ_0_0) -> (@owned @callee_guaranteed @substituted <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0) -> @out τ_0_1 for <τ_0_1, τ_0_2>) for <τ_0_0, τ_0_1, τ_0_2>) -> @owned @callee_guaranteed @substituted <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0) -> @out τ_0_1 for <τ_0_1, τ_0_2>
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// CHECK: [[CHAINED_FUNC_CONV:%.*]] = convert_function [[CHAINED_FUNC]] : $@callee_guaranteed @substituted <τ_0_0, τ_0_1> (@in_guaranteed τ_0_0) -> @out τ_0_1 for <(), ()> to $@callee_guaranteed (@in_guaranteed ()) -> @out ()
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// CHECK: [[REABSTRACT:%.*]] = function_ref @$sytytIegnr_Ieg_TR
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// CHECK: [[CHAINED_FUNC_REABSTRACTED:%.*]] = partial_apply [callee_guaranteed] [[REABSTRACT]]([[CHAINED_FUNC_CONV]])
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// CHECK: [[BORROW:%.*]] = begin_borrow [[CHAINED_FUNC_REABSTRACTED]]
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// CHECK: apply [[BORROW]]() : $@callee_guaranteed () -> ()
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