1 use rustc_middle::ty::adjustment::PointerCast;
2 use rustc_index::vec::IndexVec;
6 pub(crate) fn trans_fn<'clif, 'tcx, B: Backend + 'static>(
7 cx: &mut crate::CodegenCx<'clif, 'tcx, B>,
8 instance: Instance<'tcx>,
13 let mir = *tcx.instance_mir(instance.def);
16 let (name, sig) = get_function_name_and_sig(tcx, cx.module.isa().triple(), instance, false);
17 let func_id = cx.module.declare_function(&name, linkage, &sig).unwrap();
18 let mut debug_context = cx
21 .map(|debug_context| FunctionDebugContext::new(debug_context, instance, func_id, &name));
23 // Make FunctionBuilder
24 let context = &mut cx.cached_context;
26 context.func.name = ExternalName::user(0, func_id.as_u32());
27 context.func.signature = sig;
28 context.func.collect_debug_info();
29 let mut func_ctx = FunctionBuilderContext::new();
30 let mut bcx = FunctionBuilder::new(&mut context.func, &mut func_ctx);
33 let start_block = bcx.create_block();
34 let block_map: IndexVec<BasicBlock, Block> = (0..mir.basic_blocks().len()).map(|_| bcx.create_block()).collect();
37 let pointer_type = cx.module.target_config().pointer_type();
38 let clif_comments = crate::pretty_clif::CommentWriter::new(tcx, instance);
40 let mut fx = FunctionCx {
50 local_map: FxHashMap::default(),
51 caller_location: None, // set by `codegen_fn_prelude`
52 cold_blocks: EntitySet::new(),
55 constants_cx: &mut cx.constants_cx,
56 vtables: &mut cx.vtables,
57 source_info_set: indexmap::IndexSet::new(),
60 let arg_uninhabited = fx.mir.args_iter().any(|arg| fx.layout_of(fx.monomorphize(&fx.mir.local_decls[arg].ty)).abi.is_uninhabited());
61 let is_call_once_for_box = name.starts_with("_ZN83_$LT$alloc..boxed..Box$LT$F$GT$$u20$as$u20$core..ops..function..FnOnce$LT$A$GT$$GT$9call_once");
64 fx.bcx.append_block_params_for_function_params(fx.block_map[START_BLOCK]);
65 fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
66 crate::trap::trap_unreachable(&mut fx, "function has uninhabited argument");
67 } else if is_call_once_for_box {
68 // HACK implement `<Box<F> as FnOnce>::call_once` without `alloca`.
69 tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, false));
70 fx.bcx.switch_to_block(fx.block_map[START_BLOCK]);
71 let bb_data = &fx.mir.basic_blocks()[START_BLOCK];
72 let destination = match &bb_data.terminator().kind {
73 TerminatorKind::Call {
80 assert_eq!(args.len(), 2);
82 let closure_arg = Local::new(1);
83 let closure_local = args[0].place().unwrap().as_local().unwrap();
84 assert_eq!(fx.mir.local_decls[closure_local].ty, fx.mir.local_decls[closure_arg].ty.builtin_deref(true).unwrap().ty);
85 let closure_deref = fx.local_map[&closure_arg].place_deref(&mut fx);
86 fx.local_map.insert(closure_local, closure_deref);
88 let args_arg = Local::new(2);
89 let args_local = args[1].place().unwrap().as_local().unwrap();
90 assert_eq!(fx.mir.local_decls[args_local].ty, fx.mir.local_decls[args_arg].ty);
91 fx.local_map.insert(args_local, fx.local_map[&args_arg]);
93 fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
95 bb_data.terminator().source_info.span,
100 destination.map(|(_ret_place, ret_block)| ret_block)
105 let destination = if let Some(destination) = destination {
106 fx.bcx.switch_to_block(fx.block_map[destination]);
107 let bb_data = &fx.mir.basic_blocks()[destination];
108 match &bb_data.terminator().kind {
109 TerminatorKind::Call {
117 Some((ret_place, _ret_block)) => {
118 fx.local_map.insert(ret_place.as_local().unwrap(), CPlace::no_place(fx.layout_of(fx.tcx.mk_unit())));
123 assert_eq!(args.len(), 1);
124 fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
126 bb_data.terminator().source_info.span,
131 destination.map(|(_ret_place, ret_block)| ret_block)
139 if let Some(destination) = destination {
140 fx.bcx.switch_to_block(fx.block_map[destination]);
141 let bb_data = &fx.mir.basic_blocks()[destination];
142 match &bb_data.terminator().kind {
143 TerminatorKind::Return => crate::abi::codegen_return(&mut fx),
148 tcx.sess.time("codegen clif ir", || {
149 tcx.sess.time("codegen prelude", || crate::abi::codegen_fn_prelude(&mut fx, start_block, true));
150 codegen_fn_content(&mut fx);
154 // Recover all necessary data from fx, before accessing func will prevent future access to it.
155 let instance = fx.instance;
156 let mut clif_comments = fx.clif_comments;
157 let source_info_set = fx.source_info_set;
158 let local_map = fx.local_map;
159 let cold_blocks = fx.cold_blocks;
161 #[cfg(debug_assertions)]
162 crate::pretty_clif::write_clif_file(cx.tcx, "unopt", instance, &context.func, &clif_comments, None);
165 verify_func(tcx, &clif_comments, &context.func);
167 // Perform rust specific optimizations
168 tcx.sess.time("optimize clif ir", || {
169 crate::optimize::optimize_function(tcx, instance, context, &cold_blocks, &mut clif_comments);
173 let module = &mut cx.module;
176 || module.define_function(
179 &mut cranelift_codegen::binemit::NullTrapSink {},
183 // Write optimized function to file for debugging
184 #[cfg(debug_assertions)]
186 let value_ranges = context
187 .build_value_labels_ranges(cx.module.isa())
188 .expect("value location ranges");
190 crate::pretty_clif::write_clif_file(
200 // Define debuginfo for function
201 let isa = cx.module.isa();
202 tcx.sess.time("generate debug info", || {
205 .map(|x| x.define(context, isa, &source_info_set, local_map));
208 // Clear context to make it usable for the next function
212 pub(crate) fn verify_func(tcx: TyCtxt<'_>, writer: &crate::pretty_clif::CommentWriter, func: &Function) {
213 tcx.sess.time("verify clif ir", || {
214 let flags = settings::Flags::new(settings::builder());
215 match ::cranelift_codegen::verify_function(&func, &flags) {
218 tcx.sess.err(&format!("{:?}", err));
219 let pretty_error = ::cranelift_codegen::print_errors::pretty_verifier_error(
222 Some(Box::new(writer)),
226 .fatal(&format!("cranelift verify error:\n{}", pretty_error));
232 fn codegen_fn_content(fx: &mut FunctionCx<'_, '_, impl Backend>) {
233 for (bb, bb_data) in fx.mir.basic_blocks().iter_enumerated() {
234 let block = fx.get_block(bb);
235 fx.bcx.switch_to_block(block);
237 if bb_data.is_cleanup {
238 // Unwinding after panicking is not supported
241 // FIXME once unwinding is supported uncomment next lines
242 // // Unwinding is unlikely to happen, so mark cleanup block's as cold.
243 // fx.cold_blocks.insert(block);
247 for stmt in &bb_data.statements {
248 fx.set_debug_loc(stmt.source_info);
249 trans_stmt(fx, block, stmt);
252 #[cfg(debug_assertions)]
254 let mut terminator_head = "\n".to_string();
258 .fmt_head(&mut terminator_head)
260 let inst = fx.bcx.func.layout.last_inst(block).unwrap();
261 fx.add_comment(inst, terminator_head);
264 fx.set_debug_loc(bb_data.terminator().source_info);
266 match &bb_data.terminator().kind {
267 TerminatorKind::Goto { target } => {
268 let block = fx.get_block(*target);
269 fx.bcx.ins().jump(block, &[]);
271 TerminatorKind::Return => {
272 crate::abi::codegen_return(fx);
274 TerminatorKind::Assert {
281 if !fx.tcx.sess.overflow_checks() {
282 if let mir::AssertKind::OverflowNeg = *msg {
283 let target = fx.get_block(*target);
284 fx.bcx.ins().jump(target, &[]);
288 let cond = trans_operand(fx, cond).load_scalar(fx);
290 let target = fx.get_block(*target);
291 let failure = fx.bcx.create_block();
292 fx.cold_blocks.insert(failure);
295 fx.bcx.ins().brz(cond, failure, &[]);
297 fx.bcx.ins().brnz(cond, failure, &[]);
299 fx.bcx.ins().jump(target, &[]);
301 fx.bcx.switch_to_block(failure);
305 "[panic] Assert {:?} at {:?} failed.",
307 bb_data.terminator().source_info.span
312 TerminatorKind::SwitchInt {
318 let discr = trans_operand(fx, discr).load_scalar(fx);
319 let mut switch = ::cranelift_frontend::Switch::new();
320 for (i, value) in values.iter().enumerate() {
321 let block = fx.get_block(targets[i]);
322 switch.set_entry(*value as u64, block);
324 let otherwise_block = fx.get_block(targets[targets.len() - 1]);
325 switch.emit(&mut fx.bcx, discr, otherwise_block);
327 TerminatorKind::Call {
334 fx.tcx.sess.time("codegen call", || crate::abi::codegen_terminator_call(
336 bb_data.terminator().source_info.span,
342 TerminatorKind::Resume | TerminatorKind::Abort => {
343 trap_unreachable(fx, "[corruption] Unwinding bb reached.");
345 TerminatorKind::Unreachable => {
346 trap_unreachable(fx, "[corruption] Hit unreachable code.");
348 TerminatorKind::Yield { .. }
349 | TerminatorKind::FalseEdges { .. }
350 | TerminatorKind::FalseUnwind { .. }
351 | TerminatorKind::DropAndReplace { .. }
352 | TerminatorKind::GeneratorDrop => {
353 bug!("shouldn't exist at trans {:?}", bb_data.terminator());
355 TerminatorKind::Drop {
360 let drop_place = trans_place(fx, *location);
361 crate::abi::codegen_drop(fx, bb_data.terminator().source_info.span, drop_place);
363 let target_block = fx.get_block(*target);
364 fx.bcx.ins().jump(target_block, &[]);
369 fx.bcx.seal_all_blocks();
374 fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
375 #[allow(unused_variables)]
377 stmt: &Statement<'tcx>,
379 let _print_guard = PrintOnPanic(|| format!("stmt {:?}", stmt));
381 fx.set_debug_loc(stmt.source_info);
383 #[cfg(false_debug_assertions)]
385 StatementKind::StorageLive(..) | StatementKind::StorageDead(..) => {} // Those are not very useful
387 let inst = fx.bcx.func.layout.last_inst(cur_block).unwrap();
388 fx.add_comment(inst, format!("{:?}", stmt));
393 StatementKind::SetDiscriminant {
397 let place = trans_place(fx, **place);
398 crate::discriminant::codegen_set_discriminant(fx, place, *variant_index);
400 StatementKind::Assign(to_place_and_rval) => {
401 let lval = trans_place(fx, to_place_and_rval.0);
402 let dest_layout = lval.layout();
403 match &to_place_and_rval.1 {
404 Rvalue::Use(operand) => {
405 let val = trans_operand(fx, operand);
406 lval.write_cvalue(fx, val);
408 Rvalue::Ref(_, _, place) | Rvalue::AddressOf(_, place) => {
409 let place = trans_place(fx, *place);
410 place.write_place_ref(fx, lval);
412 Rvalue::BinaryOp(bin_op, lhs, rhs) => {
413 let lhs = trans_operand(fx, lhs);
414 let rhs = trans_operand(fx, rhs);
416 let res = crate::num::codegen_binop(fx, *bin_op, lhs, rhs);
417 lval.write_cvalue(fx, res);
419 Rvalue::CheckedBinaryOp(bin_op, lhs, rhs) => {
420 let lhs = trans_operand(fx, lhs);
421 let rhs = trans_operand(fx, rhs);
423 let res = if !fx.tcx.sess.overflow_checks() {
425 crate::num::trans_int_binop(fx, *bin_op, lhs, rhs).load_scalar(fx);
426 let is_overflow = fx.bcx.ins().iconst(types::I8, 0);
427 CValue::by_val_pair(val, is_overflow, lval.layout())
429 crate::num::trans_checked_int_binop(fx, *bin_op, lhs, rhs)
432 lval.write_cvalue(fx, res);
434 Rvalue::UnaryOp(un_op, operand) => {
435 let operand = trans_operand(fx, operand);
436 let layout = operand.layout();
437 let val = operand.load_scalar(fx);
438 let res = match un_op {
440 match layout.ty.kind {
442 let res = fx.bcx.ins().icmp_imm(IntCC::Equal, val, 0);
443 CValue::by_val(fx.bcx.ins().bint(types::I8, res), layout)
445 ty::Uint(_) | ty::Int(_) => {
446 CValue::by_val(fx.bcx.ins().bnot(val), layout)
448 _ => unreachable!("un op Not for {:?}", layout.ty),
451 UnOp::Neg => match layout.ty.kind {
452 ty::Int(IntTy::I128) => {
453 // FIXME remove this case once ineg.i128 works
454 let zero = CValue::const_val(fx, layout, 0);
455 crate::num::trans_int_binop(fx, BinOp::Sub, zero, operand)
458 CValue::by_val(fx.bcx.ins().ineg(val), layout)
461 CValue::by_val(fx.bcx.ins().fneg(val), layout)
463 _ => unreachable!("un op Neg for {:?}", layout.ty),
466 lval.write_cvalue(fx, res);
468 Rvalue::Cast(CastKind::Pointer(PointerCast::ReifyFnPointer), operand, to_ty) => {
469 let from_ty = fx.monomorphize(&operand.ty(&fx.mir.local_decls, fx.tcx));
470 let to_layout = fx.layout_of(fx.monomorphize(to_ty));
472 ty::FnDef(def_id, substs) => {
473 let func_ref = fx.get_function_ref(
474 Instance::resolve_for_fn_ptr(fx.tcx, ParamEnv::reveal_all(), def_id, substs)
477 let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
478 lval.write_cvalue(fx, CValue::by_val(func_addr, to_layout));
480 _ => bug!("Trying to ReifyFnPointer on non FnDef {:?}", from_ty),
483 Rvalue::Cast(CastKind::Pointer(PointerCast::UnsafeFnPointer), operand, to_ty)
484 | Rvalue::Cast(CastKind::Pointer(PointerCast::MutToConstPointer), operand, to_ty)
485 | Rvalue::Cast(CastKind::Pointer(PointerCast::ArrayToPointer), operand, to_ty) => {
486 let to_layout = fx.layout_of(fx.monomorphize(to_ty));
487 let operand = trans_operand(fx, operand);
488 lval.write_cvalue(fx, operand.unchecked_cast_to(to_layout));
490 Rvalue::Cast(CastKind::Misc, operand, to_ty) => {
491 let operand = trans_operand(fx, operand);
492 let from_ty = operand.layout().ty;
493 let to_ty = fx.monomorphize(to_ty);
496 fx: &FunctionCx<'_, 'tcx, impl Backend>,
499 ty.builtin_deref(true)
504 }| has_ptr_meta(fx.tcx, pointee_ty),
509 if is_fat_ptr(fx, from_ty) {
510 if is_fat_ptr(fx, to_ty) {
511 // fat-ptr -> fat-ptr
512 lval.write_cvalue(fx, operand.unchecked_cast_to(dest_layout));
514 // fat-ptr -> thin-ptr
515 let (ptr, _extra) = operand.load_scalar_pair(fx);
516 lval.write_cvalue(fx, CValue::by_val(ptr, dest_layout))
518 } else if let ty::Adt(adt_def, _substs) = from_ty.kind {
519 // enum -> discriminant value
520 assert!(adt_def.is_enum());
522 ty::Uint(_) | ty::Int(_) => {}
523 _ => unreachable!("cast adt {} -> {}", from_ty, to_ty),
526 let discr = crate::discriminant::codegen_get_discriminant(
531 lval.write_cvalue(fx, discr);
533 let to_clif_ty = fx.clif_type(to_ty).unwrap();
534 let from = operand.load_scalar(fx);
536 let res = clif_int_or_float_cast(
543 lval.write_cvalue(fx, CValue::by_val(res, dest_layout));
546 Rvalue::Cast(CastKind::Pointer(PointerCast::ClosureFnPointer(_)), operand, _to_ty) => {
547 let operand = trans_operand(fx, operand);
548 match operand.layout().ty.kind {
549 ty::Closure(def_id, substs) => {
550 let instance = Instance::resolve_closure(
554 ty::ClosureKind::FnOnce,
556 let func_ref = fx.get_function_ref(instance);
557 let func_addr = fx.bcx.ins().func_addr(fx.pointer_type, func_ref);
558 lval.write_cvalue(fx, CValue::by_val(func_addr, lval.layout()));
560 _ => bug!("{} cannot be cast to a fn ptr", operand.layout().ty),
563 Rvalue::Cast(CastKind::Pointer(PointerCast::Unsize), operand, _to_ty) => {
564 let operand = trans_operand(fx, operand);
565 operand.unsize_value(fx, lval);
567 Rvalue::Discriminant(place) => {
568 let place = trans_place(fx, *place);
569 let value = place.to_cvalue(fx);
571 crate::discriminant::codegen_get_discriminant(fx, value, dest_layout);
572 lval.write_cvalue(fx, discr);
574 Rvalue::Repeat(operand, times) => {
575 let operand = trans_operand(fx, operand);
578 .eval(fx.tcx, ParamEnv::reveal_all())
580 .try_to_bits(fx.tcx.data_layout.pointer_size)
583 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
584 let to = lval.place_index(fx, index);
585 to.write_cvalue(fx, operand);
588 Rvalue::Len(place) => {
589 let place = trans_place(fx, *place);
590 let usize_layout = fx.layout_of(fx.tcx.types.usize);
591 let len = codegen_array_len(fx, place);
592 lval.write_cvalue(fx, CValue::by_val(len, usize_layout));
594 Rvalue::NullaryOp(NullOp::Box, content_ty) => {
595 use rustc_hir::lang_items::ExchangeMallocFnLangItem;
597 let usize_type = fx.clif_type(fx.tcx.types.usize).unwrap();
598 let content_ty = fx.monomorphize(content_ty);
599 let layout = fx.layout_of(content_ty);
600 let llsize = fx.bcx.ins().iconst(usize_type, layout.size.bytes() as i64);
604 .iconst(usize_type, layout.align.abi.bytes() as i64);
605 let box_layout = fx.layout_of(fx.tcx.mk_box(content_ty));
608 let def_id = match fx.tcx.lang_items().require(ExchangeMallocFnLangItem) {
613 .fatal(&format!("allocation of `{}` {}", box_layout.ty, s));
616 let instance = ty::Instance::mono(fx.tcx, def_id);
617 let func_ref = fx.get_function_ref(instance);
618 let call = fx.bcx.ins().call(func_ref, &[llsize, llalign]);
619 let ptr = fx.bcx.inst_results(call)[0];
620 lval.write_cvalue(fx, CValue::by_val(ptr, box_layout));
622 Rvalue::NullaryOp(NullOp::SizeOf, ty) => {
626 .is_sized(fx.tcx.at(stmt.source_info.span), ParamEnv::reveal_all()));
627 let ty_size = fx.layout_of(fx.monomorphize(ty)).size.bytes();
628 let val = CValue::const_val(fx, fx.layout_of(fx.tcx.types.usize), ty_size.into());
629 lval.write_cvalue(fx, val);
631 Rvalue::Aggregate(kind, operands) => match **kind {
632 AggregateKind::Array(_ty) => {
633 for (i, operand) in operands.into_iter().enumerate() {
634 let operand = trans_operand(fx, operand);
635 let index = fx.bcx.ins().iconst(fx.pointer_type, i as i64);
636 let to = lval.place_index(fx, index);
637 to.write_cvalue(fx, operand);
640 _ => unreachable!("shouldn't exist at trans {:?}", to_place_and_rval.1),
644 StatementKind::StorageLive(_)
645 | StatementKind::StorageDead(_)
647 | StatementKind::FakeRead(..)
648 | StatementKind::Retag { .. }
649 | StatementKind::AscribeUserType(..) => {}
651 StatementKind::LlvmInlineAsm(asm) => {
652 use rustc_ast::ast::Name;
658 let rustc_hir::LlvmInlineAsmInner {
659 asm: asm_code, // Name
660 outputs, // Vec<Name>
662 clobbers, // Vec<Name>
665 dialect: _, // rustc_ast::ast::AsmDialect
668 match &*asm_code.as_str() {
670 assert_eq!(inputs, &[Name::intern("r")]);
671 assert!(outputs.is_empty(), "{:?}", outputs);
675 "cpuid" | "cpuid\n" => {
676 assert_eq!(inputs, &[Name::intern("{eax}"), Name::intern("{ecx}")]);
678 assert_eq!(outputs.len(), 4);
679 for (i, c) in (&["={eax}", "={ebx}", "={ecx}", "={edx}"])
683 assert_eq!(&outputs[i].constraint.as_str(), c);
684 assert!(!outputs[i].is_rw);
685 assert!(!outputs[i].is_indirect);
688 assert_eq!(clobbers, &[Name::intern("rbx")]);
691 assert!(!alignstack);
693 crate::trap::trap_unimplemented(
695 "__cpuid_count arch intrinsic is not supported",
699 assert_eq!(inputs, &[Name::intern("{ecx}")]);
701 assert_eq!(outputs.len(), 2);
702 for (i, c) in (&["={eax}", "={edx}"]).iter().enumerate() {
703 assert_eq!(&outputs[i].constraint.as_str(), c);
704 assert!(!outputs[i].is_rw);
705 assert!(!outputs[i].is_indirect);
708 assert_eq!(clobbers, &[]);
711 assert!(!alignstack);
713 crate::trap::trap_unimplemented(fx, "_xgetbv arch intrinsic is not supported");
715 _ => unimpl_fatal!(fx.tcx, stmt.source_info.span, "Inline assembly is not supported"),
721 fn codegen_array_len<'tcx>(
722 fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
725 match place.layout().ty.kind {
726 ty::Array(_elem_ty, len) => {
727 let len = fx.monomorphize(&len)
728 .eval(fx.tcx, ParamEnv::reveal_all())
729 .eval_usize(fx.tcx, ParamEnv::reveal_all()) as i64;
730 fx.bcx.ins().iconst(fx.pointer_type, len)
732 ty::Slice(_elem_ty) => place
733 .to_ptr_maybe_unsized(fx)
735 .expect("Length metadata for slice place"),
736 _ => bug!("Rvalue::Len({:?})", place),
740 pub(crate) fn trans_place<'tcx>(
741 fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
744 let mut cplace = fx.get_local_place(place.local);
746 for elem in place.projection {
748 PlaceElem::Deref => {
749 cplace = cplace.place_deref(fx);
751 PlaceElem::Field(field, _ty) => {
752 cplace = cplace.place_field(fx, field);
754 PlaceElem::Index(local) => {
755 let index = fx.get_local_place(local).to_cvalue(fx).load_scalar(fx);
756 cplace = cplace.place_index(fx, index);
758 PlaceElem::ConstantIndex {
763 let index = if !from_end {
764 fx.bcx.ins().iconst(fx.pointer_type, offset as i64)
766 let len = codegen_array_len(fx, cplace);
767 fx.bcx.ins().iadd_imm(len, -(offset as i64))
769 cplace = cplace.place_index(fx, index);
771 PlaceElem::Subslice { from, to, from_end } => {
772 // These indices are generated by slice patterns.
773 // slice[from:-to] in Python terms.
775 match cplace.layout().ty.kind {
776 ty::Array(elem_ty, _len) => {
777 assert!(!from_end, "array subslices are never `from_end`");
778 let elem_layout = fx.layout_of(elem_ty);
779 let ptr = cplace.to_ptr(fx);
780 cplace = CPlace::for_ptr(
781 ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * from as i64),
782 fx.layout_of(fx.tcx.mk_array(elem_ty, to as u64 - from as u64)),
785 ty::Slice(elem_ty) => {
786 assert!(from_end, "slice subslices should be `from_end`");
787 let elem_layout = fx.layout_of(elem_ty);
788 let (ptr, len) = cplace.to_ptr_maybe_unsized(fx);
789 let len = len.unwrap();
790 cplace = CPlace::for_ptr_with_extra(
791 ptr.offset_i64(fx, elem_layout.size.bytes() as i64 * from as i64),
792 fx.bcx.ins().iadd_imm(len, -(from as i64 + to as i64)),
799 PlaceElem::Downcast(_adt_def, variant) => {
800 cplace = cplace.downcast_variant(fx, variant);
808 pub(crate) fn trans_operand<'tcx>(
809 fx: &mut FunctionCx<'_, 'tcx, impl Backend>,
810 operand: &Operand<'tcx>,
813 Operand::Move(place) | Operand::Copy(place) => {
814 let cplace = trans_place(fx, *place);
817 Operand::Constant(const_) => crate::constant::trans_constant(fx, const_),