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In case an unchecked_addr_cast is used to convert between pointer and non-pointer, we missed some escaping values. This can be the case when using C unions. https://bugs.swift.org/browse/SR-12427 rdar://problem/60983997
29 lines
687 B
Swift
29 lines
687 B
Swift
// RUN: %empty-directory(%t)
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// RUN: %target-build-swift -O %s -import-objc-header %S/Inputs/dse_with_union.h -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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// Check that EscapeAnalysis does not mess up with a union.
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@inline(never)
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func printit(_ u: inout U) {
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print(u.p![0])
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}
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@inline(never)
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func testit(s: S) {
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var vs = s
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withUnsafeMutablePointer(to: &vs) {
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// A C union is an opaque type in swift and not considered as a "pointer"
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// in escape analysis. Converting between pointer and non-pointer resulted
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// in a wrong connection graph.
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var u = U(p: $0)
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printit(&u)
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}
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}
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// CHECK: S(i: 27)
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testit(s: S(i: 27))
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