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Global initializers are executed only once. Therefore it's possible to hoist such an initializer call to a loop pre-header - in case there are no conflicting side-effects in the loop before the call. Also, the call must post-dominate the loop pre-header. Otherwise it would be executed speculatively.
25 lines
490 B
Swift
25 lines
490 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-build-swift -O %s -o %t/a.out
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// RUN: %target-run %t/a.out | %FileCheck %s
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// REQUIRES: executable_test
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struct Teststruct {
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static let s = Teststruct()
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@inline(never)
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init() {
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let set = Set<String>()
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for _ in set {
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// Check that the global initializer is not hoisted out of this loop,
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// resulting in a dispatch_once re-retrance crash.
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_ = Teststruct.s
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}
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}
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}
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// CHECK: Teststruct
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print(Teststruct.s)
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