| // RUN: %empty-directory(%t) |
| // RUN: %target-build-swift -O %s -import-objc-header %S/Inputs/dse_with_union.h -o %t/a.out |
| // RUN: %target-codesign %t/a.out |
| // RUN: %target-run %t/a.out | %FileCheck %s |
| |
| // REQUIRES: executable_test |
| |
| // Check that EscapeAnalysis does not mess up with a union. |
| |
| @inline(never) |
| func printit(_ u: inout U) { |
| print(u.p![0]) |
| } |
| |
| @inline(never) |
| func testit(s: S) { |
| var vs = s |
| withUnsafeMutablePointer(to: &vs) { |
| // A C union is an opaque type in swift and not considered as a "pointer" |
| // in escape analysis. Converting between pointer and non-pointer resulted |
| // in a wrong connection graph. |
| var u = U(p: $0) |
| printit(&u) |
| } |
| } |
| |
| // CHECK: S(i: 27) |
| testit(s: S(i: 27)) |
| |
