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This optimization is doing 2 things: replacing getElement calls and replacing append(contentOf:) calls. Now if the argument to a append(contentOf:) is a previously replaced getElement call, we ended up in a use-after-free crash. The main change here is to do the transformations immediately after gathering the data (and that means: separately) and not collecting all the data and do both transformation afterwards The pass does not use any Analysis (where invalidation could be a problem). Also iterator invalidation is not a problem here. SR-10003 rdar://problem/48445856
21 lines
429 B
Swift
21 lines
429 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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// Check that ArrayElementPropagation does not crash when compiling this function.
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@inline(never)
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func testit(_ arr: inout [Int]) {
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let a = [28]
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arr += [a[0]]
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}
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var a = [27]
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testit(&a)
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// As a bonus, also check if the code works as expected.
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// CHECK: [27, 28]
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print(a)
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