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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.
18 lines
950 B
Swift
18 lines
950 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-swift-frontend %s -sil-verify-all -disable-availability-checking -emit-sil -enable-copy-propagation=false -I %t -o - | %FileCheck %s
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// REQUIRES: concurrency
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// CHECK-LABEL: sil @$s34closure_lifetime_fixup_concurrency12testAsyncLetyS2SYaF : $@convention(thin) @async (@guaranteed String) -> @owned String {
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// CHECK: [[PA:%.*]] = partial_apply [callee_guaranteed] [on_stack]
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// CHECK: [[MD:%.*]] = mark_dependence [[PA]]
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// CHECK: [[CONV:%.*]] = convert_function [[MD]]
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// CHECK: [[BAL:%.*]] = builtin "startAsyncLetWithLocalBuffer"<String>([[OPT:%.+]] : $Optional<Builtin.RawPointer>, [[CONV]]
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// CHECK: builtin "endAsyncLetLifetime"([[BAL]] : $Builtin.RawPointer, [[CONV]]
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// CHECK: } // end sil function '$s34closure_lifetime_fixup_concurrency12testAsyncLetyS2SYaF'
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public func testAsyncLet(_ n: String) async -> String {
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async let first = n
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let result = await first
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return result
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}
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