src/test/codegen/drop.rs

   1 // compile-flags: -C no-prepopulate-passes
   2
   3 #![crate_type = "lib"]
   4
   5 struct SomeUniqueName;
   6
   7 impl Drop for SomeUniqueName {
   8     fn drop(&mut self) {
   9     }
  10 }
  11
  12 pub fn possibly_unwinding() {
  13 }
  14
  15 // CHECK-LABEL: @droppy
  16 #[no_mangle]
  17 pub fn droppy() {
  18 // Check that there are exactly 6 drop calls. The cleanups for the unwinding should be reused, so
  19 // that's one new drop call per call to possibly_unwinding(), and finally 3 drop calls for the
  20 // regular function exit. We used to have problems with quadratic growths of drop calls in such
  21 // functions.
  22 // FIXME(eddyb) the `void @` forces a match on the instruction, instead of the
  23 // comment, that's `; call core::ptr::real_drop_in_place::<drop::SomeUniqueName>`
  24 // for the `v0` mangling, should switch to matching on that once `legacy` is gone.
  25 // CHECK-NOT: invoke void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  26 // CHECK: call void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  27 // CHECK: call void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  28 // CHECK-NOT: call void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  29 // CHECK: invoke void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  30 // CHECK: call void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  31 // CHECK: invoke void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  32 // CHECK: call void @{{.*}}drop_in_place{{.*}}SomeUniqueName
  33 // CHECK-NOT: {{(call|invoke) void @.*}}drop_in_place{{.*}}SomeUniqueName
  34 // The next line checks for the } that ends the function definition
  35 // CHECK-LABEL: {{^[}]}}
  36     let _s = SomeUniqueName;
  37     possibly_unwinding();
  38     let _s = SomeUniqueName;
  39     possibly_unwinding();
  40     let _s = SomeUniqueName;
  41     possibly_unwinding();
  42 }