tests/codegen/drop.rs

   1 // ignore-wasm32-bare compiled with panic=abort by default
   2 // compile-flags: -C no-prepopulate-passes
   3
   4 #![crate_type = "lib"]
   5
   6 struct SomeUniqueName;
   7
   8 impl Drop for SomeUniqueName {
   9     fn drop(&mut self) {
  10     }
  11 }
  12
  13 pub fn possibly_unwinding() {
  14 }
  15
  16 // CHECK-LABEL: @droppy
  17 #[no_mangle]
  18 pub fn droppy() {
  19 // Check that there are exactly 6 drop calls. The cleanups for the unwinding should be reused, so
  20 // that's one new drop call per call to possibly_unwinding(), and finally 3 drop calls for the
  21 // regular function exit. We used to have problems with quadratic growths of drop calls in such
  22 // functions.
  23 // FIXME(eddyb) the `void @` forces a match on the instruction, instead of the
  24 // comment, that's `; call core::ptr::drop_in_place::<drop::SomeUniqueName>`
  25 // for the `v0` mangling, should switch to matching on that once `legacy` is gone.
  26 // CHECK-COUNT-6: {{(call|invoke) void @.*}}drop_in_place{{.*}}SomeUniqueName
  27 // CHECK-NOT: {{(call|invoke) void @.*}}drop_in_place{{.*}}SomeUniqueName
  28 // The next line checks for the } that ends the function definition
  29 // CHECK-LABEL: {{^[}]}}
  30     let _s = SomeUniqueName;
  31     possibly_unwinding();
  32     let _s = SomeUniqueName;
  33     possibly_unwinding();
  34     let _s = SomeUniqueName;
  35     possibly_unwinding();
  36 }