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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.
40 lines
1.8 KiB
Swift
40 lines
1.8 KiB
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %s -emit-sil | %FileCheck %s
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// RUN: %target-swift-frontend %s -emit-sil -O | %FileCheck -check-prefix=OPT %s
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// REQUIRES: optimized_stdlib
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// Make sure that when we invoke Unmanaged._withUnsafeGuaranteedRef, we do not
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// have any ref count overhead.
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public class Klass {}
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public class KlassContainer {
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let k = Klass()
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}
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@inline(never)
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public func myPrint(_ k: Klass) { print(k) }
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// Check the codegen of _withUnsafeGuaranteedRef
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//
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// CHECK-LABEL: sil public_external [transparent] @$ss9UnmanagedV24_withUnsafeGuaranteedRefyqd__qd__xKXEKlF :
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// CHECK: bb0([[RESULT:%.*]] : $*Result, [[FUNC:%.*]] : $@noescape @callee_guaranteed @substituted <τ_0_0, τ_0_1 where τ_0_0 : AnyObject> (@guaranteed τ_0_0) -> (@out τ_0_1, @error any Error) for <Instance, Result>, [[UNMANAGED:%.*]] : $Unmanaged<Instance>):
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// CHECK: [[UNMANAGED_REF:%.*]] = struct_extract [[UNMANAGED]]
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// CHECK: [[REF:%.*]] = unmanaged_to_ref [[UNMANAGED_REF]]
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// CHECK: try_apply {{%.*}}([[RESULT]], [[REF]]) :
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// CHECK-NOT: destroy_value
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// CHECK: } // end sil function '$ss9UnmanagedV24_withUnsafeGuaranteedRefyqd__qd__xKXEKlF'
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// OPT-LABEL: sil @$s12unmanaged_rc12useUnmanagedyys0D0VyAA14KlassContainerCGF : $@convention(thin) (Unmanaged<KlassContainer>) -> () {
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// OPT: bb0([[UNMANAGED:%.*]] :
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// OPT: [[UNMANAGED_REF:%.*]] = struct_extract [[UNMANAGED]]
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// OPT: [[REF:%.*]] = unmanaged_to_ref [[UNMANAGED_REF]]
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// OPT: [[REF_ELT_ADDR:%.*]] = ref_element_addr [[REF]] : $KlassContainer, #KlassContainer.k
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// OPT: [[VALUE:%.*]] = load [[REF_ELT_ADDR]]
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// OPT: apply {{%.*}}([[VALUE]])
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// OPT: } // end sil function '$s12unmanaged_rc12useUnmanagedyys0D0VyAA14KlassContainerCGF'
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public func useUnmanaged(_ u: Unmanaged<KlassContainer>) {
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u._withUnsafeGuaranteedRef {
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myPrint($0.k)
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}
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}
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