use trans::cleanup;
use trans::cleanup::CleanupMethods;
use trans::common::*;
-use trans::datum;
use trans::debuginfo::DebugLoc;
use trans::declare;
use trans::expr;
substs: &subst::Substs<'tcx>)
-> Block<'blk, 'tcx>
{
- let repr = adt::represent_type(bcx.ccx(), t);
+ debug!("trans_struct_drop t: {}", bcx.ty_to_string(t));
// Find and call the actual destructor
- let dtor_addr = get_res_dtor(bcx.ccx(), dtor_did, t,
- class_did, substs);
+ let dtor_addr = get_res_dtor(bcx.ccx(), dtor_did, t, class_did, substs);
- // The first argument is the "self" argument for drop
+ // Class dtors have no explicit args, so the params should
+ // just consist of the environment (self).
let params = unsafe {
let ty = Type::from_ref(llvm::LLVMTypeOf(dtor_addr));
ty.element_type().func_params()
};
+ assert_eq!(params.len(), 1);
- let fty = ty::lookup_item_type(bcx.tcx(), dtor_did).ty.subst(bcx.tcx(), substs);
- let self_ty = match fty.sty {
- ty::ty_bare_fn(_, ref f) => {
- let sig = ty::erase_late_bound_regions(bcx.tcx(), &f.sig);
- assert!(sig.inputs.len() == 1);
- sig.inputs[0]
- }
- _ => bcx.sess().bug(&format!("Expected function type, found {}",
- bcx.ty_to_string(fty)))
- };
-
- let (struct_data, info) = if type_is_sized(bcx.tcx(), t) {
- (v0, None)
- } else {
- let data = GEPi(bcx, v0, &[0, abi::FAT_PTR_ADDR]);
- let info = GEPi(bcx, v0, &[0, abi::FAT_PTR_EXTRA]);
- (Load(bcx, data), Some(Load(bcx, info)))
- };
+ // Be sure to put the contents into a scope so we can use an invoke
+ // instruction to call the user destructor but still call the field
+ // destructors if the user destructor panics.
+ //
+ // FIXME (#14875) panic-in-drop semantics might be unsupported; we
+ // might well consider changing below to more direct code.
+ let contents_scope = bcx.fcx.push_custom_cleanup_scope();
- debug!("trans_struct_drop t: {} fty: {} self_ty: {}",
- bcx.ty_to_string(t), bcx.ty_to_string(fty), bcx.ty_to_string(self_ty));
- // TODO: surely no reason to keep dispatching on variants here.
- adt::fold_variants(bcx, &*repr, struct_data, |variant_cx, struct_info, value| {
- debug!("trans_struct_drop fold_variant: struct_info: {:?}", struct_info);
- // Be sure to put the enum contents into a scope so we can use an invoke
- // instruction to call the user destructor but still call the field
- // destructors if the user destructor panics.
- let field_scope = variant_cx.fcx.push_custom_cleanup_scope();
- variant_cx.fcx.schedule_drop_enum_contents(cleanup::CustomScope(field_scope), v0, t);
-
- // Class dtors have no explicit args, so the params should
- // just consist of the environment (self).
- assert_eq!(params.len(), 1);
- let self_arg = if type_is_fat_ptr(bcx.tcx(), self_ty) {
- // The dtor expects a fat pointer, so make one, even if we have to fake it.
- let scratch = datum::rvalue_scratch_datum(bcx, t, "__fat_ptr_drop_self");
- Store(bcx, value, GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_ADDR]));
- Store(bcx,
- // If we just had a thin pointer, make a fat pointer by sticking
- // null where we put the unsizing info. This works because t
- // is a sized type, so we will only unpack the fat pointer, never
- // use the fake info.
- info.unwrap_or(C_null(Type::i8p(bcx.ccx()))),
- GEPi(bcx, scratch.val, &[0, abi::FAT_PTR_EXTRA]));
- PointerCast(variant_cx, scratch.val, params[0])
- } else {
- PointerCast(variant_cx, value, params[0])
- };
+ // Issue #23611: schedule cleanup of contents, re-inspecting the
+ // discriminant (if any) in case of variant swap in drop code.
+ bcx.fcx.schedule_drop_enum_contents(cleanup::CustomScope(contents_scope), v0, t);
- let dtor_ty = ty::mk_ctor_fn(bcx.tcx(),
- class_did,
- &[get_drop_glue_type(bcx.ccx(), t)],
- ty::mk_nil(bcx.tcx()));
- let (_, variant_cx) = invoke(variant_cx, dtor_addr, &[self_arg], dtor_ty, DebugLoc::None);
+ let glue_type = get_drop_glue_type(bcx.ccx(), t);
+ let dtor_ty = ty::mk_ctor_fn(bcx.tcx(), class_did, &[glue_type], ty::mk_nil(bcx.tcx()));
+ let (_, bcx) = invoke(bcx, dtor_addr, &[v0], dtor_ty, DebugLoc::None);
- variant_cx.fcx.pop_and_trans_custom_cleanup_scope(variant_cx, field_scope)
- })
+ bcx.fcx.pop_and_trans_custom_cleanup_scope(bcx, contents_scope)
}
fn size_and_align_of_dst<'blk, 'tcx>(bcx: Block<'blk, 'tcx>, t: Ty<'tcx>, info: ValueRef)