src/test/ui/regions/regions-mock-codegen.rs

   1 // run-pass
   2 #![allow(dead_code)]
   3 #![allow(non_camel_case_types)]
   4 // pretty-expanded FIXME #23616
   5 #![feature(allocator_api)]
   6
   7 use std::alloc::{handle_alloc_error, AllocInit, AllocRef, Global, Layout};
   8 use std::ptr::NonNull;
   9
  10 struct arena(());
  11
  12 struct Bcx<'a> {
  13     fcx: &'a Fcx<'a>,
  14 }
  15
  16 struct Fcx<'a> {
  17     arena: &'a arena,
  18     ccx: &'a Ccx,
  19 }
  20
  21 struct Ccx {
  22     x: isize,
  23 }
  24
  25 fn alloc(_bcx: &arena) -> &Bcx<'_> {
  26     unsafe {
  27         let layout = Layout::new::<Bcx>();
  28         let memory = Global
  29             .alloc(layout, AllocInit::Uninitialized)
  30             .unwrap_or_else(|_| handle_alloc_error(layout));
  31         &*(memory.ptr.as_ptr() as *const _)
  32     }
  33 }
  34
  35 fn h<'a>(bcx: &'a Bcx<'a>) -> &'a Bcx<'a> {
  36     return alloc(bcx.fcx.arena);
  37 }
  38
  39 fn g(fcx: &Fcx) {
  40     let bcx = Bcx { fcx };
  41     let bcx2 = h(&bcx);
  42     unsafe {
  43         Global.dealloc(NonNull::new_unchecked(bcx2 as *const _ as *mut _), Layout::new::<Bcx>());
  44     }
  45 }
  46
  47 fn f(ccx: &Ccx) {
  48     let a = arena(());
  49     let fcx = Fcx { arena: &a, ccx };
  50     return g(&fcx);
  51 }
  52
  53 pub fn main() {
  54     let ccx = Ccx { x: 0 };
  55     f(&ccx);
  56 }