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Implement CastKind::ClosureFnPointer

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This commit is contained in:
bjorn3 2019-02-24 18:15:23 +01:00
parent 25f3ef5ff9
commit 89666d9818
2 changed files with 20 additions and 2 deletions
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2
example/mini_core_hello_world.rs
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@ -190,4 +190,6 @@ fn main() {
[] => assert_eq!(0u32, 1),
[_, ref y..] => assert_eq!(&x[1] as *const u32 as usize, &y[0] as *const u32 as usize),
}
assert_eq!(((|()| 42u8) as fn(()) -> u8)(()), 42);
}

20
src/base.rs
View File

@ -586,8 +586,24 @@ fn trans_stmt<'a, 'tcx: 'a>(
_ => unimpl!("rval misc {:?} {:?}", from_ty, to_ty),
}
}
Rvalue::Cast(CastKind::ClosureFnPointer, operand, ty) => {
unimplemented!("rval closure_fn_ptr {:?} {:?}", operand, ty)
Rvalue::Cast(CastKind::ClosureFnPointer, operand, _ty) => {
let operand = trans_operand(fx, operand);
match operand.layout().ty.sty {
ty::Closure(def_id, substs) => {
let instance = rustc_mir::monomorphize::resolve_closure(
fx.tcx,
def_id,
substs,
ty::ClosureKind::FnOnce,
);
let func_ref = fx.get_function_ref(instance);
let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
lval.write_cvalue(fx, CValue::ByVal(func_addr, lval.layout()));
}
_ => {
bug!("{} cannot be cast to a fn ptr", operand.layout().ty)
}
}
}
Rvalue::Cast(CastKind::Unsize, operand, _ty) => {
let operand = trans_operand(fx, operand);